dev_ioctl: split out ndo_eth_ioctl

[linux-2.6-block.git] / drivers / net / ethernet / micrel / ksz884x.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * drivers/net/ethernet/micrel/ksx884x.c - Micrel KSZ8841/2 PCI Ethernet driver
 *
 * Copyright (c) 2009-2010 Micrel, Inc.
 *      Tristram Ha <Tristram.Ha@micrel.com>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/mii.h>
#include <linux/platform_device.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/if_vlan.h>
#include <linux/crc32.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/micrel_phy.h>


/* DMA Registers */

#define KS_DMA_TX_CTRL                  0x0000
#define DMA_TX_ENABLE                   0x00000001
#define DMA_TX_CRC_ENABLE               0x00000002
#define DMA_TX_PAD_ENABLE               0x00000004
#define DMA_TX_LOOPBACK                 0x00000100
#define DMA_TX_FLOW_ENABLE              0x00000200
#define DMA_TX_CSUM_IP                  0x00010000
#define DMA_TX_CSUM_TCP                 0x00020000
#define DMA_TX_CSUM_UDP                 0x00040000
#define DMA_TX_BURST_SIZE               0x3F000000

#define KS_DMA_RX_CTRL                  0x0004
#define DMA_RX_ENABLE                   0x00000001
#define KS884X_DMA_RX_MULTICAST         0x00000002
#define DMA_RX_PROMISCUOUS              0x00000004
#define DMA_RX_ERROR                    0x00000008
#define DMA_RX_UNICAST                  0x00000010
#define DMA_RX_ALL_MULTICAST            0x00000020
#define DMA_RX_BROADCAST                0x00000040
#define DMA_RX_FLOW_ENABLE              0x00000200
#define DMA_RX_CSUM_IP                  0x00010000
#define DMA_RX_CSUM_TCP                 0x00020000
#define DMA_RX_CSUM_UDP                 0x00040000
#define DMA_RX_BURST_SIZE               0x3F000000

#define DMA_BURST_SHIFT                 24
#define DMA_BURST_DEFAULT               8

#define KS_DMA_TX_START                 0x0008
#define KS_DMA_RX_START                 0x000C
#define DMA_START                       0x00000001

#define KS_DMA_TX_ADDR                  0x0010
#define KS_DMA_RX_ADDR                  0x0014

#define DMA_ADDR_LIST_MASK              0xFFFFFFFC
#define DMA_ADDR_LIST_SHIFT             2

/* MTR0 */
#define KS884X_MULTICAST_0_OFFSET       0x0020
#define KS884X_MULTICAST_1_OFFSET       0x0021
#define KS884X_MULTICAST_2_OFFSET       0x0022
#define KS884x_MULTICAST_3_OFFSET       0x0023
/* MTR1 */
#define KS884X_MULTICAST_4_OFFSET       0x0024
#define KS884X_MULTICAST_5_OFFSET       0x0025
#define KS884X_MULTICAST_6_OFFSET       0x0026
#define KS884X_MULTICAST_7_OFFSET       0x0027

/* Interrupt Registers */

/* INTEN */
#define KS884X_INTERRUPTS_ENABLE        0x0028
/* INTST */
#define KS884X_INTERRUPTS_STATUS        0x002C

#define KS884X_INT_RX_STOPPED           0x02000000
#define KS884X_INT_TX_STOPPED           0x04000000
#define KS884X_INT_RX_OVERRUN           0x08000000
#define KS884X_INT_TX_EMPTY             0x10000000
#define KS884X_INT_RX                   0x20000000
#define KS884X_INT_TX                   0x40000000
#define KS884X_INT_PHY                  0x80000000

#define KS884X_INT_RX_MASK              \
        (KS884X_INT_RX | KS884X_INT_RX_OVERRUN)
#define KS884X_INT_TX_MASK              \
        (KS884X_INT_TX | KS884X_INT_TX_EMPTY)
#define KS884X_INT_MASK (KS884X_INT_RX | KS884X_INT_TX | KS884X_INT_PHY)

/* MAC Additional Station Address */

/* MAAL0 */
#define KS_ADD_ADDR_0_LO                0x0080
/* MAAH0 */
#define KS_ADD_ADDR_0_HI                0x0084
/* MAAL1 */
#define KS_ADD_ADDR_1_LO                0x0088
/* MAAH1 */
#define KS_ADD_ADDR_1_HI                0x008C
/* MAAL2 */
#define KS_ADD_ADDR_2_LO                0x0090
/* MAAH2 */
#define KS_ADD_ADDR_2_HI                0x0094
/* MAAL3 */
#define KS_ADD_ADDR_3_LO                0x0098
/* MAAH3 */
#define KS_ADD_ADDR_3_HI                0x009C
/* MAAL4 */
#define KS_ADD_ADDR_4_LO                0x00A0
/* MAAH4 */
#define KS_ADD_ADDR_4_HI                0x00A4
/* MAAL5 */
#define KS_ADD_ADDR_5_LO                0x00A8
/* MAAH5 */
#define KS_ADD_ADDR_5_HI                0x00AC
/* MAAL6 */
#define KS_ADD_ADDR_6_LO                0x00B0
/* MAAH6 */
#define KS_ADD_ADDR_6_HI                0x00B4
/* MAAL7 */
#define KS_ADD_ADDR_7_LO                0x00B8
/* MAAH7 */
#define KS_ADD_ADDR_7_HI                0x00BC
/* MAAL8 */
#define KS_ADD_ADDR_8_LO                0x00C0
/* MAAH8 */
#define KS_ADD_ADDR_8_HI                0x00C4
/* MAAL9 */
#define KS_ADD_ADDR_9_LO                0x00C8
/* MAAH9 */
#define KS_ADD_ADDR_9_HI                0x00CC
/* MAAL10 */
#define KS_ADD_ADDR_A_LO                0x00D0
/* MAAH10 */
#define KS_ADD_ADDR_A_HI                0x00D4
/* MAAL11 */
#define KS_ADD_ADDR_B_LO                0x00D8
/* MAAH11 */
#define KS_ADD_ADDR_B_HI                0x00DC
/* MAAL12 */
#define KS_ADD_ADDR_C_LO                0x00E0
/* MAAH12 */
#define KS_ADD_ADDR_C_HI                0x00E4
/* MAAL13 */
#define KS_ADD_ADDR_D_LO                0x00E8
/* MAAH13 */
#define KS_ADD_ADDR_D_HI                0x00EC
/* MAAL14 */
#define KS_ADD_ADDR_E_LO                0x00F0
/* MAAH14 */
#define KS_ADD_ADDR_E_HI                0x00F4
/* MAAL15 */
#define KS_ADD_ADDR_F_LO                0x00F8
/* MAAH15 */
#define KS_ADD_ADDR_F_HI                0x00FC

#define ADD_ADDR_HI_MASK                0x0000FFFF
#define ADD_ADDR_ENABLE                 0x80000000
#define ADD_ADDR_INCR                   8

/* Miscellaneous Registers */

/* MARL */
#define KS884X_ADDR_0_OFFSET            0x0200
#define KS884X_ADDR_1_OFFSET            0x0201
/* MARM */
#define KS884X_ADDR_2_OFFSET            0x0202
#define KS884X_ADDR_3_OFFSET            0x0203
/* MARH */
#define KS884X_ADDR_4_OFFSET            0x0204
#define KS884X_ADDR_5_OFFSET            0x0205

/* OBCR */
#define KS884X_BUS_CTRL_OFFSET          0x0210

#define BUS_SPEED_125_MHZ               0x0000
#define BUS_SPEED_62_5_MHZ              0x0001
#define BUS_SPEED_41_66_MHZ             0x0002
#define BUS_SPEED_25_MHZ                0x0003

/* EEPCR */
#define KS884X_EEPROM_CTRL_OFFSET       0x0212

#define EEPROM_CHIP_SELECT              0x0001
#define EEPROM_SERIAL_CLOCK             0x0002
#define EEPROM_DATA_OUT                 0x0004
#define EEPROM_DATA_IN                  0x0008
#define EEPROM_ACCESS_ENABLE            0x0010

/* MBIR */
#define KS884X_MEM_INFO_OFFSET          0x0214

#define RX_MEM_TEST_FAILED              0x0008
#define RX_MEM_TEST_FINISHED            0x0010
#define TX_MEM_TEST_FAILED              0x0800
#define TX_MEM_TEST_FINISHED            0x1000

/* GCR */
#define KS884X_GLOBAL_CTRL_OFFSET       0x0216
#define GLOBAL_SOFTWARE_RESET           0x0001

#define KS8841_POWER_MANAGE_OFFSET      0x0218

/* WFCR */
#define KS8841_WOL_CTRL_OFFSET          0x021A
#define KS8841_WOL_MAGIC_ENABLE         0x0080
#define KS8841_WOL_FRAME3_ENABLE        0x0008
#define KS8841_WOL_FRAME2_ENABLE        0x0004
#define KS8841_WOL_FRAME1_ENABLE        0x0002
#define KS8841_WOL_FRAME0_ENABLE        0x0001

/* WF0 */
#define KS8841_WOL_FRAME_CRC_OFFSET     0x0220
#define KS8841_WOL_FRAME_BYTE0_OFFSET   0x0224
#define KS8841_WOL_FRAME_BYTE2_OFFSET   0x0228

/* IACR */
#define KS884X_IACR_P                   0x04A0
#define KS884X_IACR_OFFSET              KS884X_IACR_P

/* IADR1 */
#define KS884X_IADR1_P                  0x04A2
#define KS884X_IADR2_P                  0x04A4
#define KS884X_IADR3_P                  0x04A6
#define KS884X_IADR4_P                  0x04A8
#define KS884X_IADR5_P                  0x04AA

#define KS884X_ACC_CTRL_SEL_OFFSET      KS884X_IACR_P
#define KS884X_ACC_CTRL_INDEX_OFFSET    (KS884X_ACC_CTRL_SEL_OFFSET + 1)

#define KS884X_ACC_DATA_0_OFFSET        KS884X_IADR4_P
#define KS884X_ACC_DATA_1_OFFSET        (KS884X_ACC_DATA_0_OFFSET + 1)
#define KS884X_ACC_DATA_2_OFFSET        KS884X_IADR5_P
#define KS884X_ACC_DATA_3_OFFSET        (KS884X_ACC_DATA_2_OFFSET + 1)
#define KS884X_ACC_DATA_4_OFFSET        KS884X_IADR2_P
#define KS884X_ACC_DATA_5_OFFSET        (KS884X_ACC_DATA_4_OFFSET + 1)
#define KS884X_ACC_DATA_6_OFFSET        KS884X_IADR3_P
#define KS884X_ACC_DATA_7_OFFSET        (KS884X_ACC_DATA_6_OFFSET + 1)
#define KS884X_ACC_DATA_8_OFFSET        KS884X_IADR1_P

/* P1MBCR */
#define KS884X_P1MBCR_P                 0x04D0
#define KS884X_P1MBSR_P                 0x04D2
#define KS884X_PHY1ILR_P                0x04D4
#define KS884X_PHY1IHR_P                0x04D6
#define KS884X_P1ANAR_P                 0x04D8
#define KS884X_P1ANLPR_P                0x04DA

/* P2MBCR */
#define KS884X_P2MBCR_P                 0x04E0
#define KS884X_P2MBSR_P                 0x04E2
#define KS884X_PHY2ILR_P                0x04E4
#define KS884X_PHY2IHR_P                0x04E6
#define KS884X_P2ANAR_P                 0x04E8
#define KS884X_P2ANLPR_P                0x04EA

#define KS884X_PHY_1_CTRL_OFFSET        KS884X_P1MBCR_P
#define PHY_CTRL_INTERVAL               (KS884X_P2MBCR_P - KS884X_P1MBCR_P)

#define KS884X_PHY_CTRL_OFFSET          0x00

#define KS884X_PHY_STATUS_OFFSET        0x02

#define KS884X_PHY_ID_1_OFFSET          0x04
#define KS884X_PHY_ID_2_OFFSET          0x06

#define KS884X_PHY_AUTO_NEG_OFFSET      0x08

#define KS884X_PHY_REMOTE_CAP_OFFSET    0x0A

/* P1VCT */
#define KS884X_P1VCT_P                  0x04F0
#define KS884X_P1PHYCTRL_P              0x04F2

/* P2VCT */
#define KS884X_P2VCT_P                  0x04F4
#define KS884X_P2PHYCTRL_P              0x04F6

#define KS884X_PHY_SPECIAL_OFFSET       KS884X_P1VCT_P
#define PHY_SPECIAL_INTERVAL            (KS884X_P2VCT_P - KS884X_P1VCT_P)

#define KS884X_PHY_LINK_MD_OFFSET       0x00

#define PHY_START_CABLE_DIAG            0x8000
#define PHY_CABLE_DIAG_RESULT           0x6000
#define PHY_CABLE_STAT_NORMAL           0x0000
#define PHY_CABLE_STAT_OPEN             0x2000
#define PHY_CABLE_STAT_SHORT            0x4000
#define PHY_CABLE_STAT_FAILED           0x6000
#define PHY_CABLE_10M_SHORT             0x1000
#define PHY_CABLE_FAULT_COUNTER         0x01FF

#define KS884X_PHY_PHY_CTRL_OFFSET      0x02

#define PHY_STAT_REVERSED_POLARITY      0x0020
#define PHY_STAT_MDIX                   0x0010
#define PHY_FORCE_LINK                  0x0008
#define PHY_POWER_SAVING_DISABLE        0x0004
#define PHY_REMOTE_LOOPBACK             0x0002

/* SIDER */
#define KS884X_SIDER_P                  0x0400
#define KS884X_CHIP_ID_OFFSET           KS884X_SIDER_P
#define KS884X_FAMILY_ID_OFFSET         (KS884X_CHIP_ID_OFFSET + 1)

#define REG_FAMILY_ID                   0x88

#define REG_CHIP_ID_41                  0x8810
#define REG_CHIP_ID_42                  0x8800

#define KS884X_CHIP_ID_MASK_41          0xFF10
#define KS884X_CHIP_ID_MASK             0xFFF0
#define KS884X_CHIP_ID_SHIFT            4
#define KS884X_REVISION_MASK            0x000E
#define KS884X_REVISION_SHIFT           1
#define KS8842_START                    0x0001

#define CHIP_IP_41_M                    0x8810
#define CHIP_IP_42_M                    0x8800
#define CHIP_IP_61_M                    0x8890
#define CHIP_IP_62_M                    0x8880

#define CHIP_IP_41_P                    0x8850
#define CHIP_IP_42_P                    0x8840
#define CHIP_IP_61_P                    0x88D0
#define CHIP_IP_62_P                    0x88C0

/* SGCR1 */
#define KS8842_SGCR1_P                  0x0402
#define KS8842_SWITCH_CTRL_1_OFFSET     KS8842_SGCR1_P

#define SWITCH_PASS_ALL                 0x8000
#define SWITCH_TX_FLOW_CTRL             0x2000
#define SWITCH_RX_FLOW_CTRL             0x1000
#define SWITCH_CHECK_LENGTH             0x0800
#define SWITCH_AGING_ENABLE             0x0400
#define SWITCH_FAST_AGING               0x0200
#define SWITCH_AGGR_BACKOFF             0x0100
#define SWITCH_PASS_PAUSE               0x0008
#define SWITCH_LINK_AUTO_AGING          0x0001

/* SGCR2 */
#define KS8842_SGCR2_P                  0x0404
#define KS8842_SWITCH_CTRL_2_OFFSET     KS8842_SGCR2_P

#define SWITCH_VLAN_ENABLE              0x8000
#define SWITCH_IGMP_SNOOP               0x4000
#define IPV6_MLD_SNOOP_ENABLE           0x2000
#define IPV6_MLD_SNOOP_OPTION           0x1000
#define PRIORITY_SCHEME_SELECT          0x0800
#define SWITCH_MIRROR_RX_TX             0x0100
#define UNICAST_VLAN_BOUNDARY           0x0080
#define MULTICAST_STORM_DISABLE         0x0040
#define SWITCH_BACK_PRESSURE            0x0020
#define FAIR_FLOW_CTRL                  0x0010
#define NO_EXC_COLLISION_DROP           0x0008
#define SWITCH_HUGE_PACKET              0x0004
#define SWITCH_LEGAL_PACKET             0x0002
#define SWITCH_BUF_RESERVE              0x0001

/* SGCR3 */
#define KS8842_SGCR3_P                  0x0406
#define KS8842_SWITCH_CTRL_3_OFFSET     KS8842_SGCR3_P

#define BROADCAST_STORM_RATE_LO         0xFF00
#define SWITCH_REPEATER                 0x0080
#define SWITCH_HALF_DUPLEX              0x0040
#define SWITCH_FLOW_CTRL                0x0020
#define SWITCH_10_MBIT                  0x0010
#define SWITCH_REPLACE_NULL_VID         0x0008
#define BROADCAST_STORM_RATE_HI         0x0007

#define BROADCAST_STORM_RATE            0x07FF

/* SGCR4 */
#define KS8842_SGCR4_P                  0x0408

/* SGCR5 */
#define KS8842_SGCR5_P                  0x040A
#define KS8842_SWITCH_CTRL_5_OFFSET     KS8842_SGCR5_P

#define LED_MODE                        0x8200
#define LED_SPEED_DUPLEX_ACT            0x0000
#define LED_SPEED_DUPLEX_LINK_ACT       0x8000
#define LED_DUPLEX_10_100               0x0200

/* SGCR6 */
#define KS8842_SGCR6_P                  0x0410
#define KS8842_SWITCH_CTRL_6_OFFSET     KS8842_SGCR6_P

#define KS8842_PRIORITY_MASK            3
#define KS8842_PRIORITY_SHIFT           2

/* SGCR7 */
#define KS8842_SGCR7_P                  0x0412
#define KS8842_SWITCH_CTRL_7_OFFSET     KS8842_SGCR7_P

#define SWITCH_UNK_DEF_PORT_ENABLE      0x0008
#define SWITCH_UNK_DEF_PORT_3           0x0004
#define SWITCH_UNK_DEF_PORT_2           0x0002
#define SWITCH_UNK_DEF_PORT_1           0x0001

/* MACAR1 */
#define KS8842_MACAR1_P                 0x0470
#define KS8842_MACAR2_P                 0x0472
#define KS8842_MACAR3_P                 0x0474
#define KS8842_MAC_ADDR_1_OFFSET        KS8842_MACAR1_P
#define KS8842_MAC_ADDR_0_OFFSET        (KS8842_MAC_ADDR_1_OFFSET + 1)
#define KS8842_MAC_ADDR_3_OFFSET        KS8842_MACAR2_P
#define KS8842_MAC_ADDR_2_OFFSET        (KS8842_MAC_ADDR_3_OFFSET + 1)
#define KS8842_MAC_ADDR_5_OFFSET        KS8842_MACAR3_P
#define KS8842_MAC_ADDR_4_OFFSET        (KS8842_MAC_ADDR_5_OFFSET + 1)

/* TOSR1 */
#define KS8842_TOSR1_P                  0x0480
#define KS8842_TOSR2_P                  0x0482
#define KS8842_TOSR3_P                  0x0484
#define KS8842_TOSR4_P                  0x0486
#define KS8842_TOSR5_P                  0x0488
#define KS8842_TOSR6_P                  0x048A
#define KS8842_TOSR7_P                  0x0490
#define KS8842_TOSR8_P                  0x0492
#define KS8842_TOS_1_OFFSET             KS8842_TOSR1_P
#define KS8842_TOS_2_OFFSET             KS8842_TOSR2_P
#define KS8842_TOS_3_OFFSET             KS8842_TOSR3_P
#define KS8842_TOS_4_OFFSET             KS8842_TOSR4_P
#define KS8842_TOS_5_OFFSET             KS8842_TOSR5_P
#define KS8842_TOS_6_OFFSET             KS8842_TOSR6_P

#define KS8842_TOS_7_OFFSET             KS8842_TOSR7_P
#define KS8842_TOS_8_OFFSET             KS8842_TOSR8_P

/* P1CR1 */
#define KS8842_P1CR1_P                  0x0500
#define KS8842_P1CR2_P                  0x0502
#define KS8842_P1VIDR_P                 0x0504
#define KS8842_P1CR3_P                  0x0506
#define KS8842_P1IRCR_P                 0x0508
#define KS8842_P1ERCR_P                 0x050A
#define KS884X_P1SCSLMD_P               0x0510
#define KS884X_P1CR4_P                  0x0512
#define KS884X_P1SR_P                   0x0514

/* P2CR1 */
#define KS8842_P2CR1_P                  0x0520
#define KS8842_P2CR2_P                  0x0522
#define KS8842_P2VIDR_P                 0x0524
#define KS8842_P2CR3_P                  0x0526
#define KS8842_P2IRCR_P                 0x0528
#define KS8842_P2ERCR_P                 0x052A
#define KS884X_P2SCSLMD_P               0x0530
#define KS884X_P2CR4_P                  0x0532
#define KS884X_P2SR_P                   0x0534

/* P3CR1 */
#define KS8842_P3CR1_P                  0x0540
#define KS8842_P3CR2_P                  0x0542
#define KS8842_P3VIDR_P                 0x0544
#define KS8842_P3CR3_P                  0x0546
#define KS8842_P3IRCR_P                 0x0548
#define KS8842_P3ERCR_P                 0x054A

#define KS8842_PORT_1_CTRL_1            KS8842_P1CR1_P
#define KS8842_PORT_2_CTRL_1            KS8842_P2CR1_P
#define KS8842_PORT_3_CTRL_1            KS8842_P3CR1_P

#define PORT_CTRL_ADDR(port, addr)              \
        (addr = KS8842_PORT_1_CTRL_1 + (port) * \
                (KS8842_PORT_2_CTRL_1 - KS8842_PORT_1_CTRL_1))

#define KS8842_PORT_CTRL_1_OFFSET       0x00

#define PORT_BROADCAST_STORM            0x0080
#define PORT_DIFFSERV_ENABLE            0x0040
#define PORT_802_1P_ENABLE              0x0020
#define PORT_BASED_PRIORITY_MASK        0x0018
#define PORT_BASED_PRIORITY_BASE        0x0003
#define PORT_BASED_PRIORITY_SHIFT       3
#define PORT_BASED_PRIORITY_0           0x0000
#define PORT_BASED_PRIORITY_1           0x0008
#define PORT_BASED_PRIORITY_2           0x0010
#define PORT_BASED_PRIORITY_3           0x0018
#define PORT_INSERT_TAG                 0x0004
#define PORT_REMOVE_TAG                 0x0002
#define PORT_PRIO_QUEUE_ENABLE          0x0001

#define KS8842_PORT_CTRL_2_OFFSET       0x02

#define PORT_INGRESS_VLAN_FILTER        0x4000
#define PORT_DISCARD_NON_VID            0x2000
#define PORT_FORCE_FLOW_CTRL            0x1000
#define PORT_BACK_PRESSURE              0x0800
#define PORT_TX_ENABLE                  0x0400
#define PORT_RX_ENABLE                  0x0200
#define PORT_LEARN_DISABLE              0x0100
#define PORT_MIRROR_SNIFFER             0x0080
#define PORT_MIRROR_RX                  0x0040
#define PORT_MIRROR_TX                  0x0020
#define PORT_USER_PRIORITY_CEILING      0x0008
#define PORT_VLAN_MEMBERSHIP            0x0007

#define KS8842_PORT_CTRL_VID_OFFSET     0x04

#define PORT_DEFAULT_VID                0x0001

#define KS8842_PORT_CTRL_3_OFFSET       0x06

#define PORT_INGRESS_LIMIT_MODE         0x000C
#define PORT_INGRESS_ALL                0x0000
#define PORT_INGRESS_UNICAST            0x0004
#define PORT_INGRESS_MULTICAST          0x0008
#define PORT_INGRESS_BROADCAST          0x000C
#define PORT_COUNT_IFG                  0x0002
#define PORT_COUNT_PREAMBLE             0x0001

#define KS8842_PORT_IN_RATE_OFFSET      0x08
#define KS8842_PORT_OUT_RATE_OFFSET     0x0A

#define PORT_PRIORITY_RATE              0x0F
#define PORT_PRIORITY_RATE_SHIFT        4

#define KS884X_PORT_LINK_MD             0x10

#define PORT_CABLE_10M_SHORT            0x8000
#define PORT_CABLE_DIAG_RESULT          0x6000
#define PORT_CABLE_STAT_NORMAL          0x0000
#define PORT_CABLE_STAT_OPEN            0x2000
#define PORT_CABLE_STAT_SHORT           0x4000
#define PORT_CABLE_STAT_FAILED          0x6000
#define PORT_START_CABLE_DIAG           0x1000
#define PORT_FORCE_LINK                 0x0800
#define PORT_POWER_SAVING_DISABLE       0x0400
#define PORT_PHY_REMOTE_LOOPBACK        0x0200
#define PORT_CABLE_FAULT_COUNTER        0x01FF

#define KS884X_PORT_CTRL_4_OFFSET       0x12

#define PORT_LED_OFF                    0x8000
#define PORT_TX_DISABLE                 0x4000
#define PORT_AUTO_NEG_RESTART           0x2000
#define PORT_REMOTE_FAULT_DISABLE       0x1000
#define PORT_POWER_DOWN                 0x0800
#define PORT_AUTO_MDIX_DISABLE          0x0400
#define PORT_FORCE_MDIX                 0x0200
#define PORT_LOOPBACK                   0x0100
#define PORT_AUTO_NEG_ENABLE            0x0080
#define PORT_FORCE_100_MBIT             0x0040
#define PORT_FORCE_FULL_DUPLEX          0x0020
#define PORT_AUTO_NEG_SYM_PAUSE         0x0010
#define PORT_AUTO_NEG_100BTX_FD         0x0008
#define PORT_AUTO_NEG_100BTX            0x0004
#define PORT_AUTO_NEG_10BT_FD           0x0002
#define PORT_AUTO_NEG_10BT              0x0001

#define KS884X_PORT_STATUS_OFFSET       0x14

#define PORT_HP_MDIX                    0x8000
#define PORT_REVERSED_POLARITY          0x2000
#define PORT_RX_FLOW_CTRL               0x0800
#define PORT_TX_FLOW_CTRL               0x1000
#define PORT_STATUS_SPEED_100MBIT       0x0400
#define PORT_STATUS_FULL_DUPLEX         0x0200
#define PORT_REMOTE_FAULT               0x0100
#define PORT_MDIX_STATUS                0x0080
#define PORT_AUTO_NEG_COMPLETE          0x0040
#define PORT_STATUS_LINK_GOOD           0x0020
#define PORT_REMOTE_SYM_PAUSE           0x0010
#define PORT_REMOTE_100BTX_FD           0x0008
#define PORT_REMOTE_100BTX              0x0004
#define PORT_REMOTE_10BT_FD             0x0002
#define PORT_REMOTE_10BT                0x0001

/*
#define STATIC_MAC_TABLE_ADDR           00-0000FFFF-FFFFFFFF
#define STATIC_MAC_TABLE_FWD_PORTS      00-00070000-00000000
#define STATIC_MAC_TABLE_VALID          00-00080000-00000000
#define STATIC_MAC_TABLE_OVERRIDE       00-00100000-00000000
#define STATIC_MAC_TABLE_USE_FID        00-00200000-00000000
#define STATIC_MAC_TABLE_FID            00-03C00000-00000000
*/

#define STATIC_MAC_TABLE_ADDR           0x0000FFFF
#define STATIC_MAC_TABLE_FWD_PORTS      0x00070000
#define STATIC_MAC_TABLE_VALID          0x00080000
#define STATIC_MAC_TABLE_OVERRIDE       0x00100000
#define STATIC_MAC_TABLE_USE_FID        0x00200000
#define STATIC_MAC_TABLE_FID            0x03C00000

#define STATIC_MAC_FWD_PORTS_SHIFT      16
#define STATIC_MAC_FID_SHIFT            22

/*
#define VLAN_TABLE_VID                  00-00000000-00000FFF
#define VLAN_TABLE_FID                  00-00000000-0000F000
#define VLAN_TABLE_MEMBERSHIP           00-00000000-00070000
#define VLAN_TABLE_VALID                00-00000000-00080000
*/

#define VLAN_TABLE_VID                  0x00000FFF
#define VLAN_TABLE_FID                  0x0000F000
#define VLAN_TABLE_MEMBERSHIP           0x00070000
#define VLAN_TABLE_VALID                0x00080000

#define VLAN_TABLE_FID_SHIFT            12
#define VLAN_TABLE_MEMBERSHIP_SHIFT     16

/*
#define DYNAMIC_MAC_TABLE_ADDR          00-0000FFFF-FFFFFFFF
#define DYNAMIC_MAC_TABLE_FID           00-000F0000-00000000
#define DYNAMIC_MAC_TABLE_SRC_PORT      00-00300000-00000000
#define DYNAMIC_MAC_TABLE_TIMESTAMP     00-00C00000-00000000
#define DYNAMIC_MAC_TABLE_ENTRIES       03-FF000000-00000000
#define DYNAMIC_MAC_TABLE_MAC_EMPTY     04-00000000-00000000
#define DYNAMIC_MAC_TABLE_RESERVED      78-00000000-00000000
#define DYNAMIC_MAC_TABLE_NOT_READY     80-00000000-00000000
*/

#define DYNAMIC_MAC_TABLE_ADDR          0x0000FFFF
#define DYNAMIC_MAC_TABLE_FID           0x000F0000
#define DYNAMIC_MAC_TABLE_SRC_PORT      0x00300000
#define DYNAMIC_MAC_TABLE_TIMESTAMP     0x00C00000
#define DYNAMIC_MAC_TABLE_ENTRIES       0xFF000000

#define DYNAMIC_MAC_TABLE_ENTRIES_H     0x03
#define DYNAMIC_MAC_TABLE_MAC_EMPTY     0x04
#define DYNAMIC_MAC_TABLE_RESERVED      0x78
#define DYNAMIC_MAC_TABLE_NOT_READY     0x80

#define DYNAMIC_MAC_FID_SHIFT           16
#define DYNAMIC_MAC_SRC_PORT_SHIFT      20
#define DYNAMIC_MAC_TIMESTAMP_SHIFT     22
#define DYNAMIC_MAC_ENTRIES_SHIFT       24
#define DYNAMIC_MAC_ENTRIES_H_SHIFT     8

/*
#define MIB_COUNTER_VALUE               00-00000000-3FFFFFFF
#define MIB_COUNTER_VALID               00-00000000-40000000
#define MIB_COUNTER_OVERFLOW            00-00000000-80000000
*/

#define MIB_COUNTER_VALUE               0x3FFFFFFF
#define MIB_COUNTER_VALID               0x40000000
#define MIB_COUNTER_OVERFLOW            0x80000000

#define MIB_PACKET_DROPPED              0x0000FFFF

#define KS_MIB_PACKET_DROPPED_TX_0      0x100
#define KS_MIB_PACKET_DROPPED_TX_1      0x101
#define KS_MIB_PACKET_DROPPED_TX        0x102
#define KS_MIB_PACKET_DROPPED_RX_0      0x103
#define KS_MIB_PACKET_DROPPED_RX_1      0x104
#define KS_MIB_PACKET_DROPPED_RX        0x105

/* Change default LED mode. */
#define SET_DEFAULT_LED                 LED_SPEED_DUPLEX_ACT

#define MAC_ADDR_ORDER(i)               (ETH_ALEN - 1 - (i))

#define MAX_ETHERNET_BODY_SIZE          1500
#define ETHERNET_HEADER_SIZE            (14 + VLAN_HLEN)

#define MAX_ETHERNET_PACKET_SIZE        \
        (MAX_ETHERNET_BODY_SIZE + ETHERNET_HEADER_SIZE)

#define REGULAR_RX_BUF_SIZE             (MAX_ETHERNET_PACKET_SIZE + 4)
#define MAX_RX_BUF_SIZE                 (1912 + 4)

#define ADDITIONAL_ENTRIES              16
#define MAX_MULTICAST_LIST              32

#define HW_MULTICAST_SIZE               8

#define HW_TO_DEV_PORT(port)            (port - 1)

enum {
        media_connected,
        media_disconnected
};

enum {
        OID_COUNTER_UNKOWN,

        OID_COUNTER_FIRST,

        /* total transmit errors */
        OID_COUNTER_XMIT_ERROR,

        /* total receive errors */
        OID_COUNTER_RCV_ERROR,

        OID_COUNTER_LAST
};

/*
 * Hardware descriptor definitions
 */

#define DESC_ALIGNMENT                  16
#define BUFFER_ALIGNMENT                8

#define NUM_OF_RX_DESC                  64
#define NUM_OF_TX_DESC                  64

#define KS_DESC_RX_FRAME_LEN            0x000007FF
#define KS_DESC_RX_FRAME_TYPE           0x00008000
#define KS_DESC_RX_ERROR_CRC            0x00010000
#define KS_DESC_RX_ERROR_RUNT           0x00020000
#define KS_DESC_RX_ERROR_TOO_LONG       0x00040000
#define KS_DESC_RX_ERROR_PHY            0x00080000
#define KS884X_DESC_RX_PORT_MASK        0x00300000
#define KS_DESC_RX_MULTICAST            0x01000000
#define KS_DESC_RX_ERROR                0x02000000
#define KS_DESC_RX_ERROR_CSUM_UDP       0x04000000
#define KS_DESC_RX_ERROR_CSUM_TCP       0x08000000
#define KS_DESC_RX_ERROR_CSUM_IP        0x10000000
#define KS_DESC_RX_LAST                 0x20000000
#define KS_DESC_RX_FIRST                0x40000000
#define KS_DESC_RX_ERROR_COND           \
        (KS_DESC_RX_ERROR_CRC |         \
        KS_DESC_RX_ERROR_RUNT |         \
        KS_DESC_RX_ERROR_PHY |          \
        KS_DESC_RX_ERROR_TOO_LONG)

#define KS_DESC_HW_OWNED                0x80000000

#define KS_DESC_BUF_SIZE                0x000007FF
#define KS884X_DESC_TX_PORT_MASK        0x00300000
#define KS_DESC_END_OF_RING             0x02000000
#define KS_DESC_TX_CSUM_GEN_UDP         0x04000000
#define KS_DESC_TX_CSUM_GEN_TCP         0x08000000
#define KS_DESC_TX_CSUM_GEN_IP          0x10000000
#define KS_DESC_TX_LAST                 0x20000000
#define KS_DESC_TX_FIRST                0x40000000
#define KS_DESC_TX_INTERRUPT            0x80000000

#define KS_DESC_PORT_SHIFT              20

#define KS_DESC_RX_MASK                 (KS_DESC_BUF_SIZE)

#define KS_DESC_TX_MASK                 \
        (KS_DESC_TX_INTERRUPT |         \
        KS_DESC_TX_FIRST |              \
        KS_DESC_TX_LAST |               \
        KS_DESC_TX_CSUM_GEN_IP |        \
        KS_DESC_TX_CSUM_GEN_TCP |       \
        KS_DESC_TX_CSUM_GEN_UDP |       \
        KS_DESC_BUF_SIZE)

struct ksz_desc_rx_stat {
#ifdef __BIG_ENDIAN_BITFIELD
        u32 hw_owned:1;
        u32 first_desc:1;
        u32 last_desc:1;
        u32 csum_err_ip:1;
        u32 csum_err_tcp:1;
        u32 csum_err_udp:1;
        u32 error:1;
        u32 multicast:1;
        u32 src_port:4;
        u32 err_phy:1;
        u32 err_too_long:1;
        u32 err_runt:1;
        u32 err_crc:1;
        u32 frame_type:1;
        u32 reserved1:4;
        u32 frame_len:11;
#else
        u32 frame_len:11;
        u32 reserved1:4;
        u32 frame_type:1;
        u32 err_crc:1;
        u32 err_runt:1;
        u32 err_too_long:1;
        u32 err_phy:1;
        u32 src_port:4;
        u32 multicast:1;
        u32 error:1;
        u32 csum_err_udp:1;
        u32 csum_err_tcp:1;
        u32 csum_err_ip:1;
        u32 last_desc:1;
        u32 first_desc:1;
        u32 hw_owned:1;
#endif
};

struct ksz_desc_tx_stat {
#ifdef __BIG_ENDIAN_BITFIELD
        u32 hw_owned:1;
        u32 reserved1:31;
#else
        u32 reserved1:31;
        u32 hw_owned:1;
#endif
};

struct ksz_desc_rx_buf {
#ifdef __BIG_ENDIAN_BITFIELD
        u32 reserved4:6;
        u32 end_of_ring:1;
        u32 reserved3:14;
        u32 buf_size:11;
#else
        u32 buf_size:11;
        u32 reserved3:14;
        u32 end_of_ring:1;
        u32 reserved4:6;
#endif
};

struct ksz_desc_tx_buf {
#ifdef __BIG_ENDIAN_BITFIELD
        u32 intr:1;
        u32 first_seg:1;
        u32 last_seg:1;
        u32 csum_gen_ip:1;
        u32 csum_gen_tcp:1;
        u32 csum_gen_udp:1;
        u32 end_of_ring:1;
        u32 reserved4:1;
        u32 dest_port:4;
        u32 reserved3:9;
        u32 buf_size:11;
#else
        u32 buf_size:11;
        u32 reserved3:9;
        u32 dest_port:4;
        u32 reserved4:1;
        u32 end_of_ring:1;
        u32 csum_gen_udp:1;
        u32 csum_gen_tcp:1;
        u32 csum_gen_ip:1;
        u32 last_seg:1;
        u32 first_seg:1;
        u32 intr:1;
#endif
};

union desc_stat {
        struct ksz_desc_rx_stat rx;
        struct ksz_desc_tx_stat tx;
        u32 data;
};

union desc_buf {
        struct ksz_desc_rx_buf rx;
        struct ksz_desc_tx_buf tx;
        u32 data;
};

/**
 * struct ksz_hw_desc - Hardware descriptor data structure
 * @ctrl:       Descriptor control value.
 * @buf:        Descriptor buffer value.
 * @addr:       Physical address of memory buffer.
 * @next:       Pointer to next hardware descriptor.
 */
struct ksz_hw_desc {
        union desc_stat ctrl;
        union desc_buf buf;
        u32 addr;
        u32 next;
};

/**
 * struct ksz_sw_desc - Software descriptor data structure
 * @ctrl:       Descriptor control value.
 * @buf:        Descriptor buffer value.
 * @buf_size:   Current buffers size value in hardware descriptor.
 */
struct ksz_sw_desc {
        union desc_stat ctrl;
        union desc_buf buf;
        u32 buf_size;
};

/**
 * struct ksz_dma_buf - OS dependent DMA buffer data structure
 * @skb:        Associated socket buffer.
 * @dma:        Associated physical DMA address.
 * @len:        Actual len used.
 */
struct ksz_dma_buf {
        struct sk_buff *skb;
        dma_addr_t dma;
        int len;
};

/**
 * struct ksz_desc - Descriptor structure
 * @phw:        Hardware descriptor pointer to uncached physical memory.
 * @sw:         Cached memory to hold hardware descriptor values for
 *              manipulation.
 * @dma_buf:    Operating system dependent data structure to hold physical
 *              memory buffer allocation information.
 */
struct ksz_desc {
        struct ksz_hw_desc *phw;
        struct ksz_sw_desc sw;
        struct ksz_dma_buf dma_buf;
};

#define DMA_BUFFER(desc)  ((struct ksz_dma_buf *)(&(desc)->dma_buf))

/**
 * struct ksz_desc_info - Descriptor information data structure
 * @ring:       First descriptor in the ring.
 * @cur:        Current descriptor being manipulated.
 * @ring_virt:  First hardware descriptor in the ring.
 * @ring_phys:  The physical address of the first descriptor of the ring.
 * @size:       Size of hardware descriptor.
 * @alloc:      Number of descriptors allocated.
 * @avail:      Number of descriptors available for use.
 * @last:       Index for last descriptor released to hardware.
 * @next:       Index for next descriptor available for use.
 * @mask:       Mask for index wrapping.
 */
struct ksz_desc_info {
        struct ksz_desc *ring;
        struct ksz_desc *cur;
        struct ksz_hw_desc *ring_virt;
        u32 ring_phys;
        int size;
        int alloc;
        int avail;
        int last;
        int next;
        int mask;
};

/*
 * KSZ8842 switch definitions
 */

enum {
        TABLE_STATIC_MAC = 0,
        TABLE_VLAN,
        TABLE_DYNAMIC_MAC,
        TABLE_MIB
};

#define LEARNED_MAC_TABLE_ENTRIES       1024
#define STATIC_MAC_TABLE_ENTRIES        8

/**
 * struct ksz_mac_table - Static MAC table data structure
 * @mac_addr:   MAC address to filter.
 * @vid:        VID value.
 * @fid:        FID value.
 * @ports:      Port membership.
 * @override:   Override setting.
 * @use_fid:    FID use setting.
 * @valid:      Valid setting indicating the entry is being used.
 */
struct ksz_mac_table {
        u8 mac_addr[ETH_ALEN];
        u16 vid;
        u8 fid;
        u8 ports;
        u8 override:1;
        u8 use_fid:1;
        u8 valid:1;
};

#define VLAN_TABLE_ENTRIES              16

/**
 * struct ksz_vlan_table - VLAN table data structure
 * @vid:        VID value.
 * @fid:        FID value.
 * @member:     Port membership.
 */
struct ksz_vlan_table {
        u16 vid;
        u8 fid;
        u8 member;
};

#define DIFFSERV_ENTRIES                64
#define PRIO_802_1P_ENTRIES             8
#define PRIO_QUEUES                     4

#define SWITCH_PORT_NUM                 2
#define TOTAL_PORT_NUM                  (SWITCH_PORT_NUM + 1)
#define HOST_MASK                       (1 << SWITCH_PORT_NUM)
#define PORT_MASK                       7

#define MAIN_PORT                       0
#define OTHER_PORT                      1
#define HOST_PORT                       SWITCH_PORT_NUM

#define PORT_COUNTER_NUM                0x20
#define TOTAL_PORT_COUNTER_NUM          (PORT_COUNTER_NUM + 2)

#define MIB_COUNTER_RX_LO_PRIORITY      0x00
#define MIB_COUNTER_RX_HI_PRIORITY      0x01
#define MIB_COUNTER_RX_UNDERSIZE        0x02
#define MIB_COUNTER_RX_FRAGMENT         0x03
#define MIB_COUNTER_RX_OVERSIZE         0x04
#define MIB_COUNTER_RX_JABBER           0x05
#define MIB_COUNTER_RX_SYMBOL_ERR       0x06
#define MIB_COUNTER_RX_CRC_ERR          0x07
#define MIB_COUNTER_RX_ALIGNMENT_ERR    0x08
#define MIB_COUNTER_RX_CTRL_8808        0x09
#define MIB_COUNTER_RX_PAUSE            0x0A
#define MIB_COUNTER_RX_BROADCAST        0x0B
#define MIB_COUNTER_RX_MULTICAST        0x0C
#define MIB_COUNTER_RX_UNICAST          0x0D
#define MIB_COUNTER_RX_OCTET_64         0x0E
#define MIB_COUNTER_RX_OCTET_65_127     0x0F
#define MIB_COUNTER_RX_OCTET_128_255    0x10
#define MIB_COUNTER_RX_OCTET_256_511    0x11
#define MIB_COUNTER_RX_OCTET_512_1023   0x12
#define MIB_COUNTER_RX_OCTET_1024_1522  0x13
#define MIB_COUNTER_TX_LO_PRIORITY      0x14
#define MIB_COUNTER_TX_HI_PRIORITY      0x15
#define MIB_COUNTER_TX_LATE_COLLISION   0x16
#define MIB_COUNTER_TX_PAUSE            0x17
#define MIB_COUNTER_TX_BROADCAST        0x18
#define MIB_COUNTER_TX_MULTICAST        0x19
#define MIB_COUNTER_TX_UNICAST          0x1A
#define MIB_COUNTER_TX_DEFERRED         0x1B
#define MIB_COUNTER_TX_TOTAL_COLLISION  0x1C
#define MIB_COUNTER_TX_EXCESS_COLLISION 0x1D
#define MIB_COUNTER_TX_SINGLE_COLLISION 0x1E
#define MIB_COUNTER_TX_MULTI_COLLISION  0x1F

#define MIB_COUNTER_RX_DROPPED_PACKET   0x20
#define MIB_COUNTER_TX_DROPPED_PACKET   0x21

/**
 * struct ksz_port_mib - Port MIB data structure
 * @cnt_ptr:    Current pointer to MIB counter index.
 * @link_down:  Indication the link has just gone down.
 * @state:      Connection status of the port.
 * @mib_start:  The starting counter index.  Some ports do not start at 0.
 * @counter:    64-bit MIB counter value.
 * @dropped:    Temporary buffer to remember last read packet dropped values.
 *
 * MIB counters needs to be read periodically so that counters do not get
 * overflowed and give incorrect values.  A right balance is needed to
 * satisfy this condition and not waste too much CPU time.
 *
 * It is pointless to read MIB counters when the port is disconnected.  The
 * @state provides the connection status so that MIB counters are read only
 * when the port is connected.  The @link_down indicates the port is just
 * disconnected so that all MIB counters are read one last time to update the
 * information.
 */
struct ksz_port_mib {
        u8 cnt_ptr;
        u8 link_down;
        u8 state;
        u8 mib_start;

        u64 counter[TOTAL_PORT_COUNTER_NUM];
        u32 dropped[2];
};

/**
 * struct ksz_port_cfg - Port configuration data structure
 * @vid:        VID value.
 * @member:     Port membership.
 * @port_prio:  Port priority.
 * @rx_rate:    Receive priority rate.
 * @tx_rate:    Transmit priority rate.
 * @stp_state:  Current Spanning Tree Protocol state.
 */
struct ksz_port_cfg {
        u16 vid;
        u8 member;
        u8 port_prio;
        u32 rx_rate[PRIO_QUEUES];
        u32 tx_rate[PRIO_QUEUES];
        int stp_state;
};

/**
 * struct ksz_switch - KSZ8842 switch data structure
 * @mac_table:  MAC table entries information.
 * @vlan_table: VLAN table entries information.
 * @port_cfg:   Port configuration information.
 * @diffserv:   DiffServ priority settings.  Possible values from 6-bit of ToS
 *              (bit7 ~ bit2) field.
 * @p_802_1p:   802.1P priority settings.  Possible values from 3-bit of 802.1p
 *              Tag priority field.
 * @br_addr:    Bridge address.  Used for STP.
 * @other_addr: Other MAC address.  Used for multiple network device mode.
 * @broad_per:  Broadcast storm percentage.
 * @member:     Current port membership.  Used for STP.
 */
struct ksz_switch {
        struct ksz_mac_table mac_table[STATIC_MAC_TABLE_ENTRIES];
        struct ksz_vlan_table vlan_table[VLAN_TABLE_ENTRIES];
        struct ksz_port_cfg port_cfg[TOTAL_PORT_NUM];

        u8 diffserv[DIFFSERV_ENTRIES];
        u8 p_802_1p[PRIO_802_1P_ENTRIES];

        u8 br_addr[ETH_ALEN];
        u8 other_addr[ETH_ALEN];

        u8 broad_per;
        u8 member;
};

#define TX_RATE_UNIT                    10000

/**
 * struct ksz_port_info - Port information data structure
 * @state:      Connection status of the port.
 * @tx_rate:    Transmit rate divided by 10000 to get Mbit.
 * @duplex:     Duplex mode.
 * @advertised: Advertised auto-negotiation setting.  Used to determine link.
 * @partner:    Auto-negotiation partner setting.  Used to determine link.
 * @port_id:    Port index to access actual hardware register.
 * @pdev:       Pointer to OS dependent network device.
 */
struct ksz_port_info {
        uint state;
        uint tx_rate;
        u8 duplex;
        u8 advertised;
        u8 partner;
        u8 port_id;
        void *pdev;
};

#define MAX_TX_HELD_SIZE                52000

/* Hardware features and bug fixes. */
#define LINK_INT_WORKING                (1 << 0)
#define SMALL_PACKET_TX_BUG             (1 << 1)
#define HALF_DUPLEX_SIGNAL_BUG          (1 << 2)
#define RX_HUGE_FRAME                   (1 << 4)
#define STP_SUPPORT                     (1 << 8)

/* Software overrides. */
#define PAUSE_FLOW_CTRL                 (1 << 0)
#define FAST_AGING                      (1 << 1)

/**
 * struct ksz_hw - KSZ884X hardware data structure
 * @io:                 Virtual address assigned.
 * @ksz_switch:         Pointer to KSZ8842 switch.
 * @port_info:          Port information.
 * @port_mib:           Port MIB information.
 * @dev_count:          Number of network devices this hardware supports.
 * @dst_ports:          Destination ports in switch for transmission.
 * @id:                 Hardware ID.  Used for display only.
 * @mib_cnt:            Number of MIB counters this hardware has.
 * @mib_port_cnt:       Number of ports with MIB counters.
 * @tx_cfg:             Cached transmit control settings.
 * @rx_cfg:             Cached receive control settings.
 * @intr_mask:          Current interrupt mask.
 * @intr_set:           Current interrup set.
 * @intr_blocked:       Interrupt blocked.
 * @rx_desc_info:       Receive descriptor information.
 * @tx_desc_info:       Transmit descriptor information.
 * @tx_int_cnt:         Transmit interrupt count.  Used for TX optimization.
 * @tx_int_mask:        Transmit interrupt mask.  Used for TX optimization.
 * @tx_size:            Transmit data size.  Used for TX optimization.
 *                      The maximum is defined by MAX_TX_HELD_SIZE.
 * @perm_addr:          Permanent MAC address.
 * @override_addr:      Overridden MAC address.
 * @address:            Additional MAC address entries.
 * @addr_list_size:     Additional MAC address list size.
 * @mac_override:       Indication of MAC address overridden.
 * @promiscuous:        Counter to keep track of promiscuous mode set.
 * @all_multi:          Counter to keep track of all multicast mode set.
 * @multi_list:         Multicast address entries.
 * @multi_bits:         Cached multicast hash table settings.
 * @multi_list_size:    Multicast address list size.
 * @enabled:            Indication of hardware enabled.
 * @rx_stop:            Indication of receive process stop.
 * @reserved2:          none
 * @features:           Hardware features to enable.
 * @overrides:          Hardware features to override.
 * @parent:             Pointer to parent, network device private structure.
 */
struct ksz_hw {
        void __iomem *io;

        struct ksz_switch *ksz_switch;
        struct ksz_port_info port_info[SWITCH_PORT_NUM];
        struct ksz_port_mib port_mib[TOTAL_PORT_NUM];
        int dev_count;
        int dst_ports;
        int id;
        int mib_cnt;
        int mib_port_cnt;

        u32 tx_cfg;
        u32 rx_cfg;
        u32 intr_mask;
        u32 intr_set;
        uint intr_blocked;

        struct ksz_desc_info rx_desc_info;
        struct ksz_desc_info tx_desc_info;

        int tx_int_cnt;
        int tx_int_mask;
        int tx_size;

        u8 perm_addr[ETH_ALEN];
        u8 override_addr[ETH_ALEN];
        u8 address[ADDITIONAL_ENTRIES][ETH_ALEN];
        u8 addr_list_size;
        u8 mac_override;
        u8 promiscuous;
        u8 all_multi;
        u8 multi_list[MAX_MULTICAST_LIST][ETH_ALEN];
        u8 multi_bits[HW_MULTICAST_SIZE];
        u8 multi_list_size;

        u8 enabled;
        u8 rx_stop;
        u8 reserved2[1];

        uint features;
        uint overrides;

        void *parent;
};

enum {
        PHY_NO_FLOW_CTRL,
        PHY_FLOW_CTRL,
        PHY_TX_ONLY,
        PHY_RX_ONLY
};

/**
 * struct ksz_port - Virtual port data structure
 * @duplex:             Duplex mode setting.  1 for half duplex, 2 for full
 *                      duplex, and 0 for auto, which normally results in full
 *                      duplex.
 * @speed:              Speed setting.  10 for 10 Mbit, 100 for 100 Mbit, and
 *                      0 for auto, which normally results in 100 Mbit.
 * @force_link:         Force link setting.  0 for auto-negotiation, and 1 for
 *                      force.
 * @flow_ctrl:          Flow control setting.  PHY_NO_FLOW_CTRL for no flow
 *                      control, and PHY_FLOW_CTRL for flow control.
 *                      PHY_TX_ONLY and PHY_RX_ONLY are not supported for 100
 *                      Mbit PHY.
 * @first_port:         Index of first port this port supports.
 * @mib_port_cnt:       Number of ports with MIB counters.
 * @port_cnt:           Number of ports this port supports.
 * @counter:            Port statistics counter.
 * @hw:                 Pointer to hardware structure.
 * @linked:             Pointer to port information linked to this port.
 */
struct ksz_port {
        u8 duplex;
        u8 speed;
        u8 force_link;
        u8 flow_ctrl;

        int first_port;
        int mib_port_cnt;
        int port_cnt;
        u64 counter[OID_COUNTER_LAST];

        struct ksz_hw *hw;
        struct ksz_port_info *linked;
};

/**
 * struct ksz_timer_info - Timer information data structure
 * @timer:      Kernel timer.
 * @cnt:        Running timer counter.
 * @max:        Number of times to run timer; -1 for infinity.
 * @period:     Timer period in jiffies.
 */
struct ksz_timer_info {
        struct timer_list timer;
        int cnt;
        int max;
        int period;
};

/**
 * struct ksz_shared_mem - OS dependent shared memory data structure
 * @dma_addr:   Physical DMA address allocated.
 * @alloc_size: Allocation size.
 * @phys:       Actual physical address used.
 * @alloc_virt: Virtual address allocated.
 * @virt:       Actual virtual address used.
 */
struct ksz_shared_mem {
        dma_addr_t dma_addr;
        uint alloc_size;
        uint phys;
        u8 *alloc_virt;
        u8 *virt;
};

/**
 * struct ksz_counter_info - OS dependent counter information data structure
 * @counter:    Wait queue to wakeup after counters are read.
 * @time:       Next time in jiffies to read counter.
 * @read:       Indication of counters read in full or not.
 */
struct ksz_counter_info {
        wait_queue_head_t counter;
        unsigned long time;
        int read;
};

/**
 * struct dev_info - Network device information data structure
 * @dev:                Pointer to network device.
 * @pdev:               Pointer to PCI device.
 * @hw:                 Hardware structure.
 * @desc_pool:          Physical memory used for descriptor pool.
 * @hwlock:             Spinlock to prevent hardware from accessing.
 * @lock:               Mutex lock to prevent device from accessing.
 * @dev_rcv:            Receive process function used.
 * @last_skb:           Socket buffer allocated for descriptor rx fragments.
 * @skb_index:          Buffer index for receiving fragments.
 * @skb_len:            Buffer length for receiving fragments.
 * @mib_read:           Workqueue to read MIB counters.
 * @mib_timer_info:     Timer to read MIB counters.
 * @counter:            Used for MIB reading.
 * @mtu:                Current MTU used.  The default is REGULAR_RX_BUF_SIZE;
 *                      the maximum is MAX_RX_BUF_SIZE.
 * @opened:             Counter to keep track of device open.
 * @rx_tasklet:         Receive processing tasklet.
 * @tx_tasklet:         Transmit processing tasklet.
 * @wol_enable:         Wake-on-LAN enable set by ethtool.
 * @wol_support:        Wake-on-LAN support used by ethtool.
 * @pme_wait:           Used for KSZ8841 power management.
 */
struct dev_info {
        struct net_device *dev;
        struct pci_dev *pdev;

        struct ksz_hw hw;
        struct ksz_shared_mem desc_pool;

        spinlock_t hwlock;
        struct mutex lock;

        int (*dev_rcv)(struct dev_info *);

        struct sk_buff *last_skb;
        int skb_index;
        int skb_len;

        struct work_struct mib_read;
        struct ksz_timer_info mib_timer_info;
        struct ksz_counter_info counter[TOTAL_PORT_NUM];

        int mtu;
        int opened;

        struct tasklet_struct rx_tasklet;
        struct tasklet_struct tx_tasklet;

        int wol_enable;
        int wol_support;
        unsigned long pme_wait;
};

/**
 * struct dev_priv - Network device private data structure
 * @adapter:            Adapter device information.
 * @port:               Port information.
 * @monitor_timer_info: Timer to monitor ports.
 * @proc_sem:           Semaphore for proc accessing.
 * @id:                 Device ID.
 * @mii_if:             MII interface information.
 * @advertising:        Temporary variable to store advertised settings.
 * @msg_enable:         The message flags controlling driver output.
 * @media_state:        The connection status of the device.
 * @multicast:          The all multicast state of the device.
 * @promiscuous:        The promiscuous state of the device.
 */
struct dev_priv {
        struct dev_info *adapter;
        struct ksz_port port;
        struct ksz_timer_info monitor_timer_info;

        struct semaphore proc_sem;
        int id;

        struct mii_if_info mii_if;
        u32 advertising;

        u32 msg_enable;
        int media_state;
        int multicast;
        int promiscuous;
};

#define DRV_NAME                "KSZ884X PCI"
#define DEVICE_NAME             "KSZ884x PCI"
#define DRV_VERSION             "1.0.0"
#define DRV_RELDATE             "Feb 8, 2010"

static char version[] =
        "Micrel " DEVICE_NAME " " DRV_VERSION " (" DRV_RELDATE ")";

static u8 DEFAULT_MAC_ADDRESS[] = { 0x00, 0x10, 0xA1, 0x88, 0x42, 0x01 };

/*
 * Interrupt processing primary routines
 */

static inline void hw_ack_intr(struct ksz_hw *hw, uint interrupt)
{
        writel(interrupt, hw->io + KS884X_INTERRUPTS_STATUS);
}

static inline void hw_dis_intr(struct ksz_hw *hw)
{
        hw->intr_blocked = hw->intr_mask;
        writel(0, hw->io + KS884X_INTERRUPTS_ENABLE);
        hw->intr_set = readl(hw->io + KS884X_INTERRUPTS_ENABLE);
}

static inline void hw_set_intr(struct ksz_hw *hw, uint interrupt)
{
        hw->intr_set = interrupt;
        writel(interrupt, hw->io + KS884X_INTERRUPTS_ENABLE);
}

static inline void hw_ena_intr(struct ksz_hw *hw)
{
        hw->intr_blocked = 0;
        hw_set_intr(hw, hw->intr_mask);
}

static inline void hw_dis_intr_bit(struct ksz_hw *hw, uint bit)
{
        hw->intr_mask &= ~(bit);
}

static inline void hw_turn_off_intr(struct ksz_hw *hw, uint interrupt)
{
        u32 read_intr;

        read_intr = readl(hw->io + KS884X_INTERRUPTS_ENABLE);
        hw->intr_set = read_intr & ~interrupt;
        writel(hw->intr_set, hw->io + KS884X_INTERRUPTS_ENABLE);
        hw_dis_intr_bit(hw, interrupt);
}

/**
 * hw_turn_on_intr - turn on specified interrupts
 * @hw:         The hardware instance.
 * @bit:        The interrupt bits to be on.
 *
 * This routine turns on the specified interrupts in the interrupt mask so that
 * those interrupts will be enabled.
 */
static void hw_turn_on_intr(struct ksz_hw *hw, u32 bit)
{
        hw->intr_mask |= bit;

        if (!hw->intr_blocked)
                hw_set_intr(hw, hw->intr_mask);
}

static inline void hw_ena_intr_bit(struct ksz_hw *hw, uint interrupt)
{
        u32 read_intr;

        read_intr = readl(hw->io + KS884X_INTERRUPTS_ENABLE);
        hw->intr_set = read_intr | interrupt;
        writel(hw->intr_set, hw->io + KS884X_INTERRUPTS_ENABLE);
}

static inline void hw_read_intr(struct ksz_hw *hw, uint *status)
{
        *status = readl(hw->io + KS884X_INTERRUPTS_STATUS);
        *status = *status & hw->intr_set;
}

static inline void hw_restore_intr(struct ksz_hw *hw, uint interrupt)
{
        if (interrupt)
                hw_ena_intr(hw);
}

/**
 * hw_block_intr - block hardware interrupts
 * @hw: The hardware instance.
 *
 * This function blocks all interrupts of the hardware and returns the current
 * interrupt enable mask so that interrupts can be restored later.
 *
 * Return the current interrupt enable mask.
 */
static uint hw_block_intr(struct ksz_hw *hw)
{
        uint interrupt = 0;

        if (!hw->intr_blocked) {
                hw_dis_intr(hw);
                interrupt = hw->intr_blocked;
        }
        return interrupt;
}

/*
 * Hardware descriptor routines
 */

static inline void reset_desc(struct ksz_desc *desc, union desc_stat status)
{
        status.rx.hw_owned = 0;
        desc->phw->ctrl.data = cpu_to_le32(status.data);
}

static inline void release_desc(struct ksz_desc *desc)
{
        desc->sw.ctrl.tx.hw_owned = 1;
        if (desc->sw.buf_size != desc->sw.buf.data) {
                desc->sw.buf_size = desc->sw.buf.data;
                desc->phw->buf.data = cpu_to_le32(desc->sw.buf.data);
        }
        desc->phw->ctrl.data = cpu_to_le32(desc->sw.ctrl.data);
}

static void get_rx_pkt(struct ksz_desc_info *info, struct ksz_desc **desc)
{
        *desc = &info->ring[info->last];
        info->last++;
        info->last &= info->mask;
        info->avail--;
        (*desc)->sw.buf.data &= ~KS_DESC_RX_MASK;
}

static inline void set_rx_buf(struct ksz_desc *desc, u32 addr)
{
        desc->phw->addr = cpu_to_le32(addr);
}

static inline void set_rx_len(struct ksz_desc *desc, u32 len)
{
        desc->sw.buf.rx.buf_size = len;
}

static inline void get_tx_pkt(struct ksz_desc_info *info,
        struct ksz_desc **desc)
{
        *desc = &info->ring[info->next];
        info->next++;
        info->next &= info->mask;
        info->avail--;
        (*desc)->sw.buf.data &= ~KS_DESC_TX_MASK;
}

static inline void set_tx_buf(struct ksz_desc *desc, u32 addr)
{
        desc->phw->addr = cpu_to_le32(addr);
}

static inline void set_tx_len(struct ksz_desc *desc, u32 len)
{
        desc->sw.buf.tx.buf_size = len;
}

/* Switch functions */

#define TABLE_READ                      0x10
#define TABLE_SEL_SHIFT                 2

#define HW_DELAY(hw, reg)                       \
        do {                                    \
                readw(hw->io + reg);            \
        } while (0)

/**
 * sw_r_table - read 4 bytes of data from switch table
 * @hw:         The hardware instance.
 * @table:      The table selector.
 * @addr:       The address of the table entry.
 * @data:       Buffer to store the read data.
 *
 * This routine reads 4 bytes of data from the table of the switch.
 * Hardware interrupts are disabled to minimize corruption of read data.
 */
static void sw_r_table(struct ksz_hw *hw, int table, u16 addr, u32 *data)
{
        u16 ctrl_addr;
        uint interrupt;

        ctrl_addr = (((table << TABLE_SEL_SHIFT) | TABLE_READ) << 8) | addr;

        interrupt = hw_block_intr(hw);

        writew(ctrl_addr, hw->io + KS884X_IACR_OFFSET);
        HW_DELAY(hw, KS884X_IACR_OFFSET);
        *data = readl(hw->io + KS884X_ACC_DATA_0_OFFSET);

        hw_restore_intr(hw, interrupt);
}

/**
 * sw_w_table_64 - write 8 bytes of data to the switch table
 * @hw:         The hardware instance.
 * @table:      The table selector.
 * @addr:       The address of the table entry.
 * @data_hi:    The high part of data to be written (bit63 ~ bit32).
 * @data_lo:    The low part of data to be written (bit31 ~ bit0).
 *
 * This routine writes 8 bytes of data to the table of the switch.
 * Hardware interrupts are disabled to minimize corruption of written data.
 */
static void sw_w_table_64(struct ksz_hw *hw, int table, u16 addr, u32 data_hi,
        u32 data_lo)
{
        u16 ctrl_addr;
        uint interrupt;

        ctrl_addr = ((table << TABLE_SEL_SHIFT) << 8) | addr;

        interrupt = hw_block_intr(hw);

        writel(data_hi, hw->io + KS884X_ACC_DATA_4_OFFSET);
        writel(data_lo, hw->io + KS884X_ACC_DATA_0_OFFSET);

        writew(ctrl_addr, hw->io + KS884X_IACR_OFFSET);
        HW_DELAY(hw, KS884X_IACR_OFFSET);

        hw_restore_intr(hw, interrupt);
}

/**
 * sw_w_sta_mac_table - write to the static MAC table
 * @hw:         The hardware instance.
 * @addr:       The address of the table entry.
 * @mac_addr:   The MAC address.
 * @ports:      The port members.
 * @override:   The flag to override the port receive/transmit settings.
 * @valid:      The flag to indicate entry is valid.
 * @use_fid:    The flag to indicate the FID is valid.
 * @fid:        The FID value.
 *
 * This routine writes an entry of the static MAC table of the switch.  It
 * calls sw_w_table_64() to write the data.
 */
static void sw_w_sta_mac_table(struct ksz_hw *hw, u16 addr, u8 *mac_addr,
        u8 ports, int override, int valid, int use_fid, u8 fid)
{
        u32 data_hi;
        u32 data_lo;

        data_lo = ((u32) mac_addr[2] << 24) |
                ((u32) mac_addr[3] << 16) |
                ((u32) mac_addr[4] << 8) | mac_addr[5];
        data_hi = ((u32) mac_addr[0] << 8) | mac_addr[1];
        data_hi |= (u32) ports << STATIC_MAC_FWD_PORTS_SHIFT;

        if (override)
                data_hi |= STATIC_MAC_TABLE_OVERRIDE;
        if (use_fid) {
                data_hi |= STATIC_MAC_TABLE_USE_FID;
                data_hi |= (u32) fid << STATIC_MAC_FID_SHIFT;
        }
        if (valid)
                data_hi |= STATIC_MAC_TABLE_VALID;

        sw_w_table_64(hw, TABLE_STATIC_MAC, addr, data_hi, data_lo);
}

/**
 * sw_r_vlan_table - read from the VLAN table
 * @hw:         The hardware instance.
 * @addr:       The address of the table entry.
 * @vid:        Buffer to store the VID.
 * @fid:        Buffer to store the VID.
 * @member:     Buffer to store the port membership.
 *
 * This function reads an entry of the VLAN table of the switch.  It calls
 * sw_r_table() to get the data.
 *
 * Return 0 if the entry is valid; otherwise -1.
 */
static int sw_r_vlan_table(struct ksz_hw *hw, u16 addr, u16 *vid, u8 *fid,
        u8 *member)
{
        u32 data;

        sw_r_table(hw, TABLE_VLAN, addr, &data);
        if (data & VLAN_TABLE_VALID) {
                *vid = (u16)(data & VLAN_TABLE_VID);
                *fid = (u8)((data & VLAN_TABLE_FID) >> VLAN_TABLE_FID_SHIFT);
                *member = (u8)((data & VLAN_TABLE_MEMBERSHIP) >>
                        VLAN_TABLE_MEMBERSHIP_SHIFT);
                return 0;
        }
        return -1;
}

/**
 * port_r_mib_cnt - read MIB counter
 * @hw:         The hardware instance.
 * @port:       The port index.
 * @addr:       The address of the counter.
 * @cnt:        Buffer to store the counter.
 *
 * This routine reads a MIB counter of the port.
 * Hardware interrupts are disabled to minimize corruption of read data.
 */
static void port_r_mib_cnt(struct ksz_hw *hw, int port, u16 addr, u64 *cnt)
{
        u32 data;
        u16 ctrl_addr;
        uint interrupt;
        int timeout;

        ctrl_addr = addr + PORT_COUNTER_NUM * port;

        interrupt = hw_block_intr(hw);

        ctrl_addr |= (((TABLE_MIB << TABLE_SEL_SHIFT) | TABLE_READ) << 8);
        writew(ctrl_addr, hw->io + KS884X_IACR_OFFSET);
        HW_DELAY(hw, KS884X_IACR_OFFSET);

        for (timeout = 100; timeout > 0; timeout--) {
                data = readl(hw->io + KS884X_ACC_DATA_0_OFFSET);

                if (data & MIB_COUNTER_VALID) {
                        if (data & MIB_COUNTER_OVERFLOW)
                                *cnt += MIB_COUNTER_VALUE + 1;
                        *cnt += data & MIB_COUNTER_VALUE;
                        break;
                }
        }

        hw_restore_intr(hw, interrupt);
}

/**
 * port_r_mib_pkt - read dropped packet counts
 * @hw:         The hardware instance.
 * @port:       The port index.
 * @last:       last one
 * @cnt:        Buffer to store the receive and transmit dropped packet counts.
 *
 * This routine reads the dropped packet counts of the port.
 * Hardware interrupts are disabled to minimize corruption of read data.
 */
static void port_r_mib_pkt(struct ksz_hw *hw, int port, u32 *last, u64 *cnt)
{
        u32 cur;
        u32 data;
        u16 ctrl_addr;
        uint interrupt;
        int index;

        index = KS_MIB_PACKET_DROPPED_RX_0 + port;
        do {
                interrupt = hw_block_intr(hw);

                ctrl_addr = (u16) index;
                ctrl_addr |= (((TABLE_MIB << TABLE_SEL_SHIFT) | TABLE_READ)
                        << 8);
                writew(ctrl_addr, hw->io + KS884X_IACR_OFFSET);
                HW_DELAY(hw, KS884X_IACR_OFFSET);
                data = readl(hw->io + KS884X_ACC_DATA_0_OFFSET);

                hw_restore_intr(hw, interrupt);

                data &= MIB_PACKET_DROPPED;
                cur = *last;
                if (data != cur) {
                        *last = data;
                        if (data < cur)
                                data += MIB_PACKET_DROPPED + 1;
                        data -= cur;
                        *cnt += data;
                }
                ++last;
                ++cnt;
                index -= KS_MIB_PACKET_DROPPED_TX -
                        KS_MIB_PACKET_DROPPED_TX_0 + 1;
        } while (index >= KS_MIB_PACKET_DROPPED_TX_0 + port);
}

/**
 * port_r_cnt - read MIB counters periodically
 * @hw:         The hardware instance.
 * @port:       The port index.
 *
 * This routine is used to read the counters of the port periodically to avoid
 * counter overflow.  The hardware should be acquired first before calling this
 * routine.
 *
 * Return non-zero when not all counters not read.
 */
static int port_r_cnt(struct ksz_hw *hw, int port)
{
        struct ksz_port_mib *mib = &hw->port_mib[port];

        if (mib->mib_start < PORT_COUNTER_NUM)
                while (mib->cnt_ptr < PORT_COUNTER_NUM) {
                        port_r_mib_cnt(hw, port, mib->cnt_ptr,
                                &mib->counter[mib->cnt_ptr]);
                        ++mib->cnt_ptr;
                }
        if (hw->mib_cnt > PORT_COUNTER_NUM)
                port_r_mib_pkt(hw, port, mib->dropped,
                        &mib->counter[PORT_COUNTER_NUM]);
        mib->cnt_ptr = 0;
        return 0;
}

/**
 * port_init_cnt - initialize MIB counter values
 * @hw:         The hardware instance.
 * @port:       The port index.
 *
 * This routine is used to initialize all counters to zero if the hardware
 * cannot do it after reset.
 */
static void port_init_cnt(struct ksz_hw *hw, int port)
{
        struct ksz_port_mib *mib = &hw->port_mib[port];

        mib->cnt_ptr = 0;
        if (mib->mib_start < PORT_COUNTER_NUM)
                do {
                        port_r_mib_cnt(hw, port, mib->cnt_ptr,
                                &mib->counter[mib->cnt_ptr]);
                        ++mib->cnt_ptr;
                } while (mib->cnt_ptr < PORT_COUNTER_NUM);
        if (hw->mib_cnt > PORT_COUNTER_NUM)
                port_r_mib_pkt(hw, port, mib->dropped,
                        &mib->counter[PORT_COUNTER_NUM]);
        memset((void *) mib->counter, 0, sizeof(u64) * TOTAL_PORT_COUNTER_NUM);
        mib->cnt_ptr = 0;
}

/*
 * Port functions
 */

/**
 * port_chk - check port register bits
 * @hw:         The hardware instance.
 * @port:       The port index.
 * @offset:     The offset of the port register.
 * @bits:       The data bits to check.
 *
 * This function checks whether the specified bits of the port register are set
 * or not.
 *
 * Return 0 if the bits are not set.
 */
static int port_chk(struct ksz_hw *hw, int port, int offset, u16 bits)
{
        u32 addr;
        u16 data;

        PORT_CTRL_ADDR(port, addr);
        addr += offset;
        data = readw(hw->io + addr);
        return (data & bits) == bits;
}

/**
 * port_cfg - set port register bits
 * @hw:         The hardware instance.
 * @port:       The port index.
 * @offset:     The offset of the port register.
 * @bits:       The data bits to set.
 * @set:        The flag indicating whether the bits are to be set or not.
 *
 * This routine sets or resets the specified bits of the port register.
 */
static void port_cfg(struct ksz_hw *hw, int port, int offset, u16 bits,
        int set)
{
        u32 addr;
        u16 data;

        PORT_CTRL_ADDR(port, addr);
        addr += offset;
        data = readw(hw->io + addr);
        if (set)
                data |= bits;
        else
                data &= ~bits;
        writew(data, hw->io + addr);
}

/**
 * port_chk_shift - check port bit
 * @hw:         The hardware instance.
 * @port:       The port index.
 * @addr:       The offset of the register.
 * @shift:      Number of bits to shift.
 *
 * This function checks whether the specified port is set in the register or
 * not.
 *
 * Return 0 if the port is not set.
 */
static int port_chk_shift(struct ksz_hw *hw, int port, u32 addr, int shift)
{
        u16 data;
        u16 bit = 1 << port;

        data = readw(hw->io + addr);
        data >>= shift;
        return (data & bit) == bit;
}

/**
 * port_cfg_shift - set port bit
 * @hw:         The hardware instance.
 * @port:       The port index.
 * @addr:       The offset of the register.
 * @shift:      Number of bits to shift.
 * @set:        The flag indicating whether the port is to be set or not.
 *
 * This routine sets or resets the specified port in the register.
 */
static void port_cfg_shift(struct ksz_hw *hw, int port, u32 addr, int shift,
        int set)
{
        u16 data;
        u16 bits = 1 << port;

        data = readw(hw->io + addr);
        bits <<= shift;
        if (set)
                data |= bits;
        else
                data &= ~bits;
        writew(data, hw->io + addr);
}

/**
 * port_r8 - read byte from port register
 * @hw:         The hardware instance.
 * @port:       The port index.
 * @offset:     The offset of the port register.
 * @data:       Buffer to store the data.
 *
 * This routine reads a byte from the port register.
 */
static void port_r8(struct ksz_hw *hw, int port, int offset, u8 *data)
{
        u32 addr;

        PORT_CTRL_ADDR(port, addr);
        addr += offset;
        *data = readb(hw->io + addr);
}

/**
 * port_r16 - read word from port register.
 * @hw:         The hardware instance.
 * @port:       The port index.
 * @offset:     The offset of the port register.
 * @data:       Buffer to store the data.
 *
 * This routine reads a word from the port register.
 */
static void port_r16(struct ksz_hw *hw, int port, int offset, u16 *data)
{
        u32 addr;

        PORT_CTRL_ADDR(port, addr);
        addr += offset;
        *data = readw(hw->io + addr);
}

/**
 * port_w16 - write word to port register.
 * @hw:         The hardware instance.
 * @port:       The port index.
 * @offset:     The offset of the port register.
 * @data:       Data to write.
 *
 * This routine writes a word to the port register.
 */
static void port_w16(struct ksz_hw *hw, int port, int offset, u16 data)
{
        u32 addr;

        PORT_CTRL_ADDR(port, addr);
        addr += offset;
        writew(data, hw->io + addr);
}

/**
 * sw_chk - check switch register bits
 * @hw:         The hardware instance.
 * @addr:       The address of the switch register.
 * @bits:       The data bits to check.
 *
 * This function checks whether the specified bits of the switch register are
 * set or not.
 *
 * Return 0 if the bits are not set.
 */
static int sw_chk(struct ksz_hw *hw, u32 addr, u16 bits)
{
        u16 data;

        data = readw(hw->io + addr);
        return (data & bits) == bits;
}

/**
 * sw_cfg - set switch register bits
 * @hw:         The hardware instance.
 * @addr:       The address of the switch register.
 * @bits:       The data bits to set.
 * @set:        The flag indicating whether the bits are to be set or not.
 *
 * This function sets or resets the specified bits of the switch register.
 */
static void sw_cfg(struct ksz_hw *hw, u32 addr, u16 bits, int set)
{
        u16 data;

        data = readw(hw->io + addr);
        if (set)
                data |= bits;
        else
                data &= ~bits;
        writew(data, hw->io + addr);
}

/* Bandwidth */

static inline void port_cfg_broad_storm(struct ksz_hw *hw, int p, int set)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_1_OFFSET, PORT_BROADCAST_STORM, set);
}

static inline int port_chk_broad_storm(struct ksz_hw *hw, int p)
{
        return port_chk(hw, p,
                KS8842_PORT_CTRL_1_OFFSET, PORT_BROADCAST_STORM);
}

/* Driver set switch broadcast storm protection at 10% rate. */
#define BROADCAST_STORM_PROTECTION_RATE 10

/* 148,800 frames * 67 ms / 100 */
#define BROADCAST_STORM_VALUE           9969

/**
 * sw_cfg_broad_storm - configure broadcast storm threshold
 * @hw:         The hardware instance.
 * @percent:    Broadcast storm threshold in percent of transmit rate.
 *
 * This routine configures the broadcast storm threshold of the switch.
 */
static void sw_cfg_broad_storm(struct ksz_hw *hw, u8 percent)
{
        u16 data;
        u32 value = ((u32) BROADCAST_STORM_VALUE * (u32) percent / 100);

        if (value > BROADCAST_STORM_RATE)
                value = BROADCAST_STORM_RATE;

        data = readw(hw->io + KS8842_SWITCH_CTRL_3_OFFSET);
        data &= ~(BROADCAST_STORM_RATE_LO | BROADCAST_STORM_RATE_HI);
        data |= ((value & 0x00FF) << 8) | ((value & 0xFF00) >> 8);
        writew(data, hw->io + KS8842_SWITCH_CTRL_3_OFFSET);
}

/**
 * sw_get_broad_storm - get broadcast storm threshold
 * @hw:         The hardware instance.
 * @percent:    Buffer to store the broadcast storm threshold percentage.
 *
 * This routine retrieves the broadcast storm threshold of the switch.
 */
static void sw_get_broad_storm(struct ksz_hw *hw, u8 *percent)
{
        int num;
        u16 data;

        data = readw(hw->io + KS8842_SWITCH_CTRL_3_OFFSET);
        num = (data & BROADCAST_STORM_RATE_HI);
        num <<= 8;
        num |= (data & BROADCAST_STORM_RATE_LO) >> 8;
        num = DIV_ROUND_CLOSEST(num * 100, BROADCAST_STORM_VALUE);
        *percent = (u8) num;
}

/**
 * sw_dis_broad_storm - disable broadstorm
 * @hw:         The hardware instance.
 * @port:       The port index.
 *
 * This routine disables the broadcast storm limit function of the switch.
 */
static void sw_dis_broad_storm(struct ksz_hw *hw, int port)
{
        port_cfg_broad_storm(hw, port, 0);
}

/**
 * sw_ena_broad_storm - enable broadcast storm
 * @hw:         The hardware instance.
 * @port:       The port index.
 *
 * This routine enables the broadcast storm limit function of the switch.
 */
static void sw_ena_broad_storm(struct ksz_hw *hw, int port)
{
        sw_cfg_broad_storm(hw, hw->ksz_switch->broad_per);
        port_cfg_broad_storm(hw, port, 1);
}

/**
 * sw_init_broad_storm - initialize broadcast storm
 * @hw:         The hardware instance.
 *
 * This routine initializes the broadcast storm limit function of the switch.
 */
static void sw_init_broad_storm(struct ksz_hw *hw)
{
        int port;

        hw->ksz_switch->broad_per = 1;
        sw_cfg_broad_storm(hw, hw->ksz_switch->broad_per);
        for (port = 0; port < TOTAL_PORT_NUM; port++)
                sw_dis_broad_storm(hw, port);
        sw_cfg(hw, KS8842_SWITCH_CTRL_2_OFFSET, MULTICAST_STORM_DISABLE, 1);
}

/**
 * hw_cfg_broad_storm - configure broadcast storm
 * @hw:         The hardware instance.
 * @percent:    Broadcast storm threshold in percent of transmit rate.
 *
 * This routine configures the broadcast storm threshold of the switch.
 * It is called by user functions.  The hardware should be acquired first.
 */
static void hw_cfg_broad_storm(struct ksz_hw *hw, u8 percent)
{
        if (percent > 100)
                percent = 100;

        sw_cfg_broad_storm(hw, percent);
        sw_get_broad_storm(hw, &percent);
        hw->ksz_switch->broad_per = percent;
}

/**
 * sw_dis_prio_rate - disable switch priority rate
 * @hw:         The hardware instance.
 * @port:       The port index.
 *
 * This routine disables the priority rate function of the switch.
 */
static void sw_dis_prio_rate(struct ksz_hw *hw, int port)
{
        u32 addr;

        PORT_CTRL_ADDR(port, addr);
        addr += KS8842_PORT_IN_RATE_OFFSET;
        writel(0, hw->io + addr);
}

/**
 * sw_init_prio_rate - initialize switch prioirty rate
 * @hw:         The hardware instance.
 *
 * This routine initializes the priority rate function of the switch.
 */
static void sw_init_prio_rate(struct ksz_hw *hw)
{
        int port;
        int prio;
        struct ksz_switch *sw = hw->ksz_switch;

        for (port = 0; port < TOTAL_PORT_NUM; port++) {
                for (prio = 0; prio < PRIO_QUEUES; prio++) {
                        sw->port_cfg[port].rx_rate[prio] =
                        sw->port_cfg[port].tx_rate[prio] = 0;
                }
                sw_dis_prio_rate(hw, port);
        }
}

/* Communication */

static inline void port_cfg_back_pressure(struct ksz_hw *hw, int p, int set)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_2_OFFSET, PORT_BACK_PRESSURE, set);
}

static inline void port_cfg_force_flow_ctrl(struct ksz_hw *hw, int p, int set)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_2_OFFSET, PORT_FORCE_FLOW_CTRL, set);
}

static inline int port_chk_back_pressure(struct ksz_hw *hw, int p)
{
        return port_chk(hw, p,
                KS8842_PORT_CTRL_2_OFFSET, PORT_BACK_PRESSURE);
}

static inline int port_chk_force_flow_ctrl(struct ksz_hw *hw, int p)
{
        return port_chk(hw, p,
                KS8842_PORT_CTRL_2_OFFSET, PORT_FORCE_FLOW_CTRL);
}

/* Spanning Tree */

static inline void port_cfg_rx(struct ksz_hw *hw, int p, int set)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_2_OFFSET, PORT_RX_ENABLE, set);
}

static inline void port_cfg_tx(struct ksz_hw *hw, int p, int set)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_2_OFFSET, PORT_TX_ENABLE, set);
}

static inline void sw_cfg_fast_aging(struct ksz_hw *hw, int set)
{
        sw_cfg(hw, KS8842_SWITCH_CTRL_1_OFFSET, SWITCH_FAST_AGING, set);
}

static inline void sw_flush_dyn_mac_table(struct ksz_hw *hw)
{
        if (!(hw->overrides & FAST_AGING)) {
                sw_cfg_fast_aging(hw, 1);
                mdelay(1);
                sw_cfg_fast_aging(hw, 0);
        }
}

/* VLAN */

static inline void port_cfg_ins_tag(struct ksz_hw *hw, int p, int insert)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_1_OFFSET, PORT_INSERT_TAG, insert);
}

static inline void port_cfg_rmv_tag(struct ksz_hw *hw, int p, int remove)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_1_OFFSET, PORT_REMOVE_TAG, remove);
}

static inline int port_chk_ins_tag(struct ksz_hw *hw, int p)
{
        return port_chk(hw, p,
                KS8842_PORT_CTRL_1_OFFSET, PORT_INSERT_TAG);
}

static inline int port_chk_rmv_tag(struct ksz_hw *hw, int p)
{
        return port_chk(hw, p,
                KS8842_PORT_CTRL_1_OFFSET, PORT_REMOVE_TAG);
}

static inline void port_cfg_dis_non_vid(struct ksz_hw *hw, int p, int set)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_2_OFFSET, PORT_DISCARD_NON_VID, set);
}

static inline void port_cfg_in_filter(struct ksz_hw *hw, int p, int set)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_2_OFFSET, PORT_INGRESS_VLAN_FILTER, set);
}

static inline int port_chk_dis_non_vid(struct ksz_hw *hw, int p)
{
        return port_chk(hw, p,
                KS8842_PORT_CTRL_2_OFFSET, PORT_DISCARD_NON_VID);
}

static inline int port_chk_in_filter(struct ksz_hw *hw, int p)
{
        return port_chk(hw, p,
                KS8842_PORT_CTRL_2_OFFSET, PORT_INGRESS_VLAN_FILTER);
}

/* Mirroring */

static inline void port_cfg_mirror_sniffer(struct ksz_hw *hw, int p, int set)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_2_OFFSET, PORT_MIRROR_SNIFFER, set);
}

static inline void port_cfg_mirror_rx(struct ksz_hw *hw, int p, int set)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_2_OFFSET, PORT_MIRROR_RX, set);
}

static inline void port_cfg_mirror_tx(struct ksz_hw *hw, int p, int set)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_2_OFFSET, PORT_MIRROR_TX, set);
}

static inline void sw_cfg_mirror_rx_tx(struct ksz_hw *hw, int set)
{
        sw_cfg(hw, KS8842_SWITCH_CTRL_2_OFFSET, SWITCH_MIRROR_RX_TX, set);
}

static void sw_init_mirror(struct ksz_hw *hw)
{
        int port;

        for (port = 0; port < TOTAL_PORT_NUM; port++) {
                port_cfg_mirror_sniffer(hw, port, 0);
                port_cfg_mirror_rx(hw, port, 0);
                port_cfg_mirror_tx(hw, port, 0);
        }
        sw_cfg_mirror_rx_tx(hw, 0);
}

static inline void sw_cfg_unk_def_deliver(struct ksz_hw *hw, int set)
{
        sw_cfg(hw, KS8842_SWITCH_CTRL_7_OFFSET,
                SWITCH_UNK_DEF_PORT_ENABLE, set);
}

static inline int sw_cfg_chk_unk_def_deliver(struct ksz_hw *hw)
{
        return sw_chk(hw, KS8842_SWITCH_CTRL_7_OFFSET,
                SWITCH_UNK_DEF_PORT_ENABLE);
}

static inline void sw_cfg_unk_def_port(struct ksz_hw *hw, int port, int set)
{
        port_cfg_shift(hw, port, KS8842_SWITCH_CTRL_7_OFFSET, 0, set);
}

static inline int sw_chk_unk_def_port(struct ksz_hw *hw, int port)
{
        return port_chk_shift(hw, port, KS8842_SWITCH_CTRL_7_OFFSET, 0);
}

/* Priority */

static inline void port_cfg_diffserv(struct ksz_hw *hw, int p, int set)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_1_OFFSET, PORT_DIFFSERV_ENABLE, set);
}

static inline void port_cfg_802_1p(struct ksz_hw *hw, int p, int set)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_1_OFFSET, PORT_802_1P_ENABLE, set);
}

static inline void port_cfg_replace_vid(struct ksz_hw *hw, int p, int set)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_2_OFFSET, PORT_USER_PRIORITY_CEILING, set);
}

static inline void port_cfg_prio(struct ksz_hw *hw, int p, int set)
{
        port_cfg(hw, p,
                KS8842_PORT_CTRL_1_OFFSET, PORT_PRIO_QUEUE_ENABLE, set);
}

static inline int port_chk_diffserv(struct ksz_hw *hw, int p)
{
        return port_chk(hw, p,
                KS8842_PORT_CTRL_1_OFFSET, PORT_DIFFSERV_ENABLE);
}

static inline int port_chk_802_1p(struct ksz_hw *hw, int p)
{
        return port_chk(hw, p,
                KS8842_PORT_CTRL_1_OFFSET, PORT_802_1P_ENABLE);
}

static inline int port_chk_replace_vid(struct ksz_hw *hw, int p)
{
        return port_chk(hw, p,
                KS8842_PORT_CTRL_2_OFFSET, PORT_USER_PRIORITY_CEILING);
}

static inline int port_chk_prio(struct ksz_hw *hw, int p)
{
        return port_chk(hw, p,
                KS8842_PORT_CTRL_1_OFFSET, PORT_PRIO_QUEUE_ENABLE);
}

/**
 * sw_dis_diffserv - disable switch DiffServ priority
 * @hw:         The hardware instance.
 * @port:       The port index.
 *
 * This routine disables the DiffServ priority function of the switch.
 */
static void sw_dis_diffserv(struct ksz_hw *hw, int port)
{
        port_cfg_diffserv(hw, port, 0);
}

/**
 * sw_dis_802_1p - disable switch 802.1p priority
 * @hw:         The hardware instance.
 * @port:       The port index.
 *
 * This routine disables the 802.1p priority function of the switch.
 */
static void sw_dis_802_1p(struct ksz_hw *hw, int port)
{
        port_cfg_802_1p(hw, port, 0);
}

/**
 * sw_cfg_replace_null_vid -
 * @hw:         The hardware instance.
 * @set:        The flag to disable or enable.
 *
 */
static void sw_cfg_replace_null_vid(struct ksz_hw *hw, int set)
{
        sw_cfg(hw, KS8842_SWITCH_CTRL_3_OFFSET, SWITCH_REPLACE_NULL_VID, set);
}

/**
 * sw_cfg_replace_vid - enable switch 802.10 priority re-mapping
 * @hw:         The hardware instance.
 * @port:       The port index.
 * @set:        The flag to disable or enable.
 *
 * This routine enables the 802.1p priority re-mapping function of the switch.
 * That allows 802.1p priority field to be replaced with the port's default
 * tag's priority value if the ingress packet's 802.1p priority has a higher
 * priority than port's default tag's priority.
 */
static void sw_cfg_replace_vid(struct ksz_hw *hw, int port, int set)
{
        port_cfg_replace_vid(hw, port, set);
}

/**
 * sw_cfg_port_based - configure switch port based priority
 * @hw:         The hardware instance.
 * @port:       The port index.
 * @prio:       The priority to set.
 *
 * This routine configures the port based priority of the switch.
 */
static void sw_cfg_port_based(struct ksz_hw *hw, int port, u8 prio)
{
        u16 data;

        if (prio > PORT_BASED_PRIORITY_BASE)
                prio = PORT_BASED_PRIORITY_BASE;

        hw->ksz_switch->port_cfg[port].port_prio = prio;

        port_r16(hw, port, KS8842_PORT_CTRL_1_OFFSET, &data);
        data &= ~PORT_BASED_PRIORITY_MASK;
        data |= prio << PORT_BASED_PRIORITY_SHIFT;
        port_w16(hw, port, KS8842_PORT_CTRL_1_OFFSET, data);
}

/**
 * sw_dis_multi_queue - disable transmit multiple queues
 * @hw:         The hardware instance.
 * @port:       The port index.
 *
 * This routine disables the transmit multiple queues selection of the switch
 * port.  Only single transmit queue on the port.
 */
static void sw_dis_multi_queue(struct ksz_hw *hw, int port)
{
        port_cfg_prio(hw, port, 0);
}

/**
 * sw_init_prio - initialize switch priority
 * @hw:         The hardware instance.
 *
 * This routine initializes the switch QoS priority functions.
 */
static void sw_init_prio(struct ksz_hw *hw)
{
        int port;
        int tos;
        struct ksz_switch *sw = hw->ksz_switch;

        /*
         * Init all the 802.1p tag priority value to be assigned to different
         * priority queue.
         */
        sw->p_802_1p[0] = 0;
        sw->p_802_1p[1] = 0;
        sw->p_802_1p[2] = 1;
        sw->p_802_1p[3] = 1;
        sw->p_802_1p[4] = 2;
        sw->p_802_1p[5] = 2;
        sw->p_802_1p[6] = 3;
        sw->p_802_1p[7] = 3;

        /*
         * Init all the DiffServ priority value to be assigned to priority
         * queue 0.
         */
        for (tos = 0; tos < DIFFSERV_ENTRIES; tos++)
                sw->diffserv[tos] = 0;

        /* All QoS functions disabled. */
        for (port = 0; port < TOTAL_PORT_NUM; port++) {
                sw_dis_multi_queue(hw, port);
                sw_dis_diffserv(hw, port);
                sw_dis_802_1p(hw, port);
                sw_cfg_replace_vid(hw, port, 0);

                sw->port_cfg[port].port_prio = 0;
                sw_cfg_port_based(hw, port, sw->port_cfg[port].port_prio);
        }
        sw_cfg_replace_null_vid(hw, 0);
}

/**
 * port_get_def_vid - get port default VID.
 * @hw:         The hardware instance.
 * @port:       The port index.
 * @vid:        Buffer to store the VID.
 *
 * This routine retrieves the default VID of the port.
 */
static void port_get_def_vid(struct ksz_hw *hw, int port, u16 *vid)
{
        u32 addr;

        PORT_CTRL_ADDR(port, addr);
        addr += KS8842_PORT_CTRL_VID_OFFSET;
        *vid = readw(hw->io + addr);
}

/**
 * sw_init_vlan - initialize switch VLAN
 * @hw:         The hardware instance.
 *
 * This routine initializes the VLAN function of the switch.
 */
static void sw_init_vlan(struct ksz_hw *hw)
{
        int port;
        int entry;
        struct ksz_switch *sw = hw->ksz_switch;

        /* Read 16 VLAN entries from device's VLAN table. */
        for (entry = 0; entry < VLAN_TABLE_ENTRIES; entry++) {
                sw_r_vlan_table(hw, entry,
                        &sw->vlan_table[entry].vid,
                        &sw->vlan_table[entry].fid,
                        &sw->vlan_table[entry].member);
        }

        for (port = 0; port < TOTAL_PORT_NUM; port++) {
                port_get_def_vid(hw, port, &sw->port_cfg[port].vid);
                sw->port_cfg[port].member = PORT_MASK;
        }
}

/**
 * sw_cfg_port_base_vlan - configure port-based VLAN membership
 * @hw:         The hardware instance.
 * @port:       The port index.
 * @member:     The port-based VLAN membership.
 *
 * This routine configures the port-based VLAN membership of the port.
 */
static void sw_cfg_port_base_vlan(struct ksz_hw *hw, int port, u8 member)
{
        u32 addr;
        u8 data;

        PORT_CTRL_ADDR(port, addr);
        addr += KS8842_PORT_CTRL_2_OFFSET;

        data = readb(hw->io + addr);
        data &= ~PORT_VLAN_MEMBERSHIP;
        data |= (member & PORT_MASK);
        writeb(data, hw->io + addr);

        hw->ksz_switch->port_cfg[port].member = member;
}

/**
 * sw_get_addr - get the switch MAC address.
 * @hw:         The hardware instance.
 * @mac_addr:   Buffer to store the MAC address.
 *
 * This function retrieves the MAC address of the switch.
 */
static inline void sw_get_addr(struct ksz_hw *hw, u8 *mac_addr)
{
        int i;

        for (i = 0; i < 6; i += 2) {
                mac_addr[i] = readb(hw->io + KS8842_MAC_ADDR_0_OFFSET + i);
                mac_addr[1 + i] = readb(hw->io + KS8842_MAC_ADDR_1_OFFSET + i);
        }
}

/**
 * sw_set_addr - configure switch MAC address
 * @hw:         The hardware instance.
 * @mac_addr:   The MAC address.
 *
 * This function configures the MAC address of the switch.
 */
static void sw_set_addr(struct ksz_hw *hw, u8 *mac_addr)
{
        int i;

        for (i = 0; i < 6; i += 2) {
                writeb(mac_addr[i], hw->io + KS8842_MAC_ADDR_0_OFFSET + i);
                writeb(mac_addr[1 + i], hw->io + KS8842_MAC_ADDR_1_OFFSET + i);
        }
}

/**
 * sw_set_global_ctrl - set switch global control
 * @hw:         The hardware instance.
 *
 * This routine sets the global control of the switch function.
 */
static void sw_set_global_ctrl(struct ksz_hw *hw)
{
        u16 data;

        /* Enable switch MII flow control. */
        data = readw(hw->io + KS8842_SWITCH_CTRL_3_OFFSET);
        data |= SWITCH_FLOW_CTRL;
        writew(data, hw->io + KS8842_SWITCH_CTRL_3_OFFSET);

        data = readw(hw->io + KS8842_SWITCH_CTRL_1_OFFSET);

        /* Enable aggressive back off algorithm in half duplex mode. */
        data |= SWITCH_AGGR_BACKOFF;

        /* Enable automatic fast aging when link changed detected. */
        data |= SWITCH_AGING_ENABLE;
        data |= SWITCH_LINK_AUTO_AGING;

        if (hw->overrides & FAST_AGING)
                data |= SWITCH_FAST_AGING;
        else
                data &= ~SWITCH_FAST_AGING;
        writew(data, hw->io + KS8842_SWITCH_CTRL_1_OFFSET);

        data = readw(hw->io + KS8842_SWITCH_CTRL_2_OFFSET);

        /* Enable no excessive collision drop. */
        data |= NO_EXC_COLLISION_DROP;
        writew(data, hw->io + KS8842_SWITCH_CTRL_2_OFFSET);
}

enum {
        STP_STATE_DISABLED = 0,
        STP_STATE_LISTENING,
        STP_STATE_LEARNING,
        STP_STATE_FORWARDING,
        STP_STATE_BLOCKED,
        STP_STATE_SIMPLE
};

/**
 * port_set_stp_state - configure port spanning tree state
 * @hw:         The hardware instance.
 * @port:       The port index.
 * @state:      The spanning tree state.
 *
 * This routine configures the spanning tree state of the port.
 */
static void port_set_stp_state(struct ksz_hw *hw, int port, int state)
{
        u16 data;

        port_r16(hw, port, KS8842_PORT_CTRL_2_OFFSET, &data);
        switch (state) {
        case STP_STATE_DISABLED:
                data &= ~(PORT_TX_ENABLE | PORT_RX_ENABLE);
                data |= PORT_LEARN_DISABLE;
                break;
        case STP_STATE_LISTENING:
/*
 * No need to turn on transmit because of port direct mode.
 * Turning on receive is required if static MAC table is not setup.
 */
                data &= ~PORT_TX_ENABLE;
                data |= PORT_RX_ENABLE;
                data |= PORT_LEARN_DISABLE;
                break;
        case STP_STATE_LEARNING:
                data &= ~PORT_TX_ENABLE;
                data |= PORT_RX_ENABLE;
                data &= ~PORT_LEARN_DISABLE;
                break;
        case STP_STATE_FORWARDING:
                data |= (PORT_TX_ENABLE | PORT_RX_ENABLE);
                data &= ~PORT_LEARN_DISABLE;
                break;
        case STP_STATE_BLOCKED:
/*
 * Need to setup static MAC table with override to keep receiving BPDU
 * messages.  See sw_init_stp routine.
 */
                data &= ~(PORT_TX_ENABLE | PORT_RX_ENABLE);
                data |= PORT_LEARN_DISABLE;
                break;
        case STP_STATE_SIMPLE:
                data |= (PORT_TX_ENABLE | PORT_RX_ENABLE);
                data |= PORT_LEARN_DISABLE;
                break;
        }
        port_w16(hw, port, KS8842_PORT_CTRL_2_OFFSET, data);
        hw->ksz_switch->port_cfg[port].stp_state = state;
}

#define STP_ENTRY                       0
#define BROADCAST_ENTRY                 1
#define BRIDGE_ADDR_ENTRY               2
#define IPV6_ADDR_ENTRY                 3

/**
 * sw_clr_sta_mac_table - clear static MAC table
 * @hw:         The hardware instance.
 *
 * This routine clears the static MAC table.
 */
static void sw_clr_sta_mac_table(struct ksz_hw *hw)
{
        struct ksz_mac_table *entry;
        int i;

        for (i = 0; i < STATIC_MAC_TABLE_ENTRIES; i++) {
                entry = &hw->ksz_switch->mac_table[i];
                sw_w_sta_mac_table(hw, i,
                        entry->mac_addr, entry->ports,
                        entry->override, 0,
                        entry->use_fid, entry->fid);
        }
}

/**
 * sw_init_stp - initialize switch spanning tree support
 * @hw:         The hardware instance.
 *
 * This routine initializes the spanning tree support of the switch.
 */
static void sw_init_stp(struct ksz_hw *hw)
{
        struct ksz_mac_table *entry;

        entry = &hw->ksz_switch->mac_table[STP_ENTRY];
        entry->mac_addr[0] = 0x01;
        entry->mac_addr[1] = 0x80;
        entry->mac_addr[2] = 0xC2;
        entry->mac_addr[3] = 0x00;
        entry->mac_addr[4] = 0x00;
        entry->mac_addr[5] = 0x00;
        entry->ports = HOST_MASK;
        entry->override = 1;
        entry->valid = 1;
        sw_w_sta_mac_table(hw, STP_ENTRY,
                entry->mac_addr, entry->ports,
                entry->override, entry->valid,
                entry->use_fid, entry->fid);
}

/**
 * sw_block_addr - block certain packets from the host port
 * @hw:         The hardware instance.
 *
 * This routine blocks certain packets from reaching to the host port.
 */
static void sw_block_addr(struct ksz_hw *hw)
{
        struct ksz_mac_table *entry;
        int i;

        for (i = BROADCAST_ENTRY; i <= IPV6_ADDR_ENTRY; i++) {
                entry = &hw->ksz_switch->mac_table[i];
                entry->valid = 0;
                sw_w_sta_mac_table(hw, i,
                        entry->mac_addr, entry->ports,
                        entry->override, entry->valid,
                        entry->use_fid, entry->fid);
        }
}

static inline void hw_r_phy_ctrl(struct ksz_hw *hw, int phy, u16 *data)
{
        *data = readw(hw->io + phy + KS884X_PHY_CTRL_OFFSET);
}

static inline void hw_w_phy_ctrl(struct ksz_hw *hw, int phy, u16 data)
{
        writew(data, hw->io + phy + KS884X_PHY_CTRL_OFFSET);
}

static inline void hw_r_phy_link_stat(struct ksz_hw *hw, int phy, u16 *data)
{
        *data = readw(hw->io + phy + KS884X_PHY_STATUS_OFFSET);
}

static inline void hw_r_phy_auto_neg(struct ksz_hw *hw, int phy, u16 *data)
{
        *data = readw(hw->io + phy + KS884X_PHY_AUTO_NEG_OFFSET);
}

static inline void hw_w_phy_auto_neg(struct ksz_hw *hw, int phy, u16 data)
{
        writew(data, hw->io + phy + KS884X_PHY_AUTO_NEG_OFFSET);
}

static inline void hw_r_phy_rem_cap(struct ksz_hw *hw, int phy, u16 *data)
{
        *data = readw(hw->io + phy + KS884X_PHY_REMOTE_CAP_OFFSET);
}

static inline void hw_r_phy_crossover(struct ksz_hw *hw, int phy, u16 *data)
{
        *data = readw(hw->io + phy + KS884X_PHY_CTRL_OFFSET);
}

static inline void hw_w_phy_crossover(struct ksz_hw *hw, int phy, u16 data)
{
        writew(data, hw->io + phy + KS884X_PHY_CTRL_OFFSET);
}

static inline void hw_r_phy_polarity(struct ksz_hw *hw, int phy, u16 *data)
{
        *data = readw(hw->io + phy + KS884X_PHY_PHY_CTRL_OFFSET);
}

static inline void hw_w_phy_polarity(struct ksz_hw *hw, int phy, u16 data)
{
        writew(data, hw->io + phy + KS884X_PHY_PHY_CTRL_OFFSET);
}

static inline void hw_r_phy_link_md(struct ksz_hw *hw, int phy, u16 *data)
{
        *data = readw(hw->io + phy + KS884X_PHY_LINK_MD_OFFSET);
}

static inline void hw_w_phy_link_md(struct ksz_hw *hw, int phy, u16 data)
{
        writew(data, hw->io + phy + KS884X_PHY_LINK_MD_OFFSET);
}

/**
 * hw_r_phy - read data from PHY register
 * @hw:         The hardware instance.
 * @port:       Port to read.
 * @reg:        PHY register to read.
 * @val:        Buffer to store the read data.
 *
 * This routine reads data from the PHY register.
 */
static void hw_r_phy(struct ksz_hw *hw, int port, u16 reg, u16 *val)
{
        int phy;

        phy = KS884X_PHY_1_CTRL_OFFSET + port * PHY_CTRL_INTERVAL + reg;
        *val = readw(hw->io + phy);
}

/**
 * hw_w_phy - write data to PHY register
 * @hw:         The hardware instance.
 * @port:       Port to write.
 * @reg:        PHY register to write.
 * @val:        Word data to write.
 *
 * This routine writes data to the PHY register.
 */
static void hw_w_phy(struct ksz_hw *hw, int port, u16 reg, u16 val)
{
        int phy;

        phy = KS884X_PHY_1_CTRL_OFFSET + port * PHY_CTRL_INTERVAL + reg;
        writew(val, hw->io + phy);
}

/*
 * EEPROM access functions
 */

#define AT93C_CODE                      0
#define AT93C_WR_OFF                    0x00
#define AT93C_WR_ALL                    0x10
#define AT93C_ER_ALL                    0x20
#define AT93C_WR_ON                     0x30

#define AT93C_WRITE                     1
#define AT93C_READ                      2
#define AT93C_ERASE                     3

#define EEPROM_DELAY                    4

static inline void drop_gpio(struct ksz_hw *hw, u8 gpio)
{
        u16 data;

        data = readw(hw->io + KS884X_EEPROM_CTRL_OFFSET);
        data &= ~gpio;
        writew(data, hw->io + KS884X_EEPROM_CTRL_OFFSET);
}

static inline void raise_gpio(struct ksz_hw *hw, u8 gpio)
{
        u16 data;

        data = readw(hw->io + KS884X_EEPROM_CTRL_OFFSET);
        data |= gpio;
        writew(data, hw->io + KS884X_EEPROM_CTRL_OFFSET);
}

static inline u8 state_gpio(struct ksz_hw *hw, u8 gpio)
{
        u16 data;

        data = readw(hw->io + KS884X_EEPROM_CTRL_OFFSET);
        return (u8)(data & gpio);
}

static void eeprom_clk(struct ksz_hw *hw)
{
        raise_gpio(hw, EEPROM_SERIAL_CLOCK);
        udelay(EEPROM_DELAY);
        drop_gpio(hw, EEPROM_SERIAL_CLOCK);
        udelay(EEPROM_DELAY);
}

static u16 spi_r(struct ksz_hw *hw)
{
        int i;
        u16 temp = 0;

        for (i = 15; i >= 0; i--) {
                raise_gpio(hw, EEPROM_SERIAL_CLOCK);
                udelay(EEPROM_DELAY);

                temp |= (state_gpio(hw, EEPROM_DATA_IN)) ? 1 << i : 0;

                drop_gpio(hw, EEPROM_SERIAL_CLOCK);
                udelay(EEPROM_DELAY);
        }
        return temp;
}

static void spi_w(struct ksz_hw *hw, u16 data)
{
        int i;

        for (i = 15; i >= 0; i--) {
                (data & (0x01 << i)) ? raise_gpio(hw, EEPROM_DATA_OUT) :
                        drop_gpio(hw, EEPROM_DATA_OUT);
                eeprom_clk(hw);
        }
}

static void spi_reg(struct ksz_hw *hw, u8 data, u8 reg)
{
        int i;

        /* Initial start bit */
        raise_gpio(hw, EEPROM_DATA_OUT);
        eeprom_clk(hw);

        /* AT93C operation */
        for (i = 1; i >= 0; i--) {
                (data & (0x01 << i)) ? raise_gpio(hw, EEPROM_DATA_OUT) :
                        drop_gpio(hw, EEPROM_DATA_OUT);
                eeprom_clk(hw);
        }

        /* Address location */
        for (i = 5; i >= 0; i--) {
                (reg & (0x01 << i)) ? raise_gpio(hw, EEPROM_DATA_OUT) :
                        drop_gpio(hw, EEPROM_DATA_OUT);
                eeprom_clk(hw);
        }
}

#define EEPROM_DATA_RESERVED            0
#define EEPROM_DATA_MAC_ADDR_0          1
#define EEPROM_DATA_MAC_ADDR_1          2
#define EEPROM_DATA_MAC_ADDR_2          3
#define EEPROM_DATA_SUBSYS_ID           4
#define EEPROM_DATA_SUBSYS_VEN_ID       5
#define EEPROM_DATA_PM_CAP              6

/* User defined EEPROM data */
#define EEPROM_DATA_OTHER_MAC_ADDR      9

/**
 * eeprom_read - read from AT93C46 EEPROM
 * @hw:         The hardware instance.
 * @reg:        The register offset.
 *
 * This function reads a word from the AT93C46 EEPROM.
 *
 * Return the data value.
 */
static u16 eeprom_read(struct ksz_hw *hw, u8 reg)
{
        u16 data;

        raise_gpio(hw, EEPROM_ACCESS_ENABLE | EEPROM_CHIP_SELECT);

        spi_reg(hw, AT93C_READ, reg);
        data = spi_r(hw);

        drop_gpio(hw, EEPROM_ACCESS_ENABLE | EEPROM_CHIP_SELECT);

        return data;
}

/**
 * eeprom_write - write to AT93C46 EEPROM
 * @hw:         The hardware instance.
 * @reg:        The register offset.
 * @data:       The data value.
 *
 * This procedure writes a word to the AT93C46 EEPROM.
 */
static void eeprom_write(struct ksz_hw *hw, u8 reg, u16 data)
{
        int timeout;

        raise_gpio(hw, EEPROM_ACCESS_ENABLE | EEPROM_CHIP_SELECT);

        /* Enable write. */
        spi_reg(hw, AT93C_CODE, AT93C_WR_ON);
        drop_gpio(hw, EEPROM_CHIP_SELECT);
        udelay(1);

        /* Erase the register. */
        raise_gpio(hw, EEPROM_CHIP_SELECT);
        spi_reg(hw, AT93C_ERASE, reg);
        drop_gpio(hw, EEPROM_CHIP_SELECT);
        udelay(1);

        /* Check operation complete. */
        raise_gpio(hw, EEPROM_CHIP_SELECT);
        timeout = 8;
        mdelay(2);
        do {
                mdelay(1);
        } while (!state_gpio(hw, EEPROM_DATA_IN) && --timeout);
        drop_gpio(hw, EEPROM_CHIP_SELECT);
        udelay(1);

        /* Write the register. */
        raise_gpio(hw, EEPROM_CHIP_SELECT);
        spi_reg(hw, AT93C_WRITE, reg);
        spi_w(hw, data);
        drop_gpio(hw, EEPROM_CHIP_SELECT);
        udelay(1);

        /* Check operation complete. */
        raise_gpio(hw, EEPROM_CHIP_SELECT);
        timeout = 8;
        mdelay(2);
        do {
                mdelay(1);
        } while (!state_gpio(hw, EEPROM_DATA_IN) && --timeout);
        drop_gpio(hw, EEPROM_CHIP_SELECT);
        udelay(1);

        /* Disable write. */
        raise_gpio(hw, EEPROM_CHIP_SELECT);
        spi_reg(hw, AT93C_CODE, AT93C_WR_OFF);

        drop_gpio(hw, EEPROM_ACCESS_ENABLE | EEPROM_CHIP_SELECT);
}

/*
 * Link detection routines
 */

static u16 advertised_flow_ctrl(struct ksz_port *port, u16 ctrl)
{
        ctrl &= ~PORT_AUTO_NEG_SYM_PAUSE;
        switch (port->flow_ctrl) {
        case PHY_FLOW_CTRL:
                ctrl |= PORT_AUTO_NEG_SYM_PAUSE;
                break;
        /* Not supported. */
        case PHY_TX_ONLY:
        case PHY_RX_ONLY:
        default:
                break;
        }
        return ctrl;
}

static void set_flow_ctrl(struct ksz_hw *hw, int rx, int tx)
{
        u32 rx_cfg;
        u32 tx_cfg;

        rx_cfg = hw->rx_cfg;
        tx_cfg = hw->tx_cfg;
        if (rx)
                hw->rx_cfg |= DMA_RX_FLOW_ENABLE;
        else
                hw->rx_cfg &= ~DMA_RX_FLOW_ENABLE;
        if (tx)
                hw->tx_cfg |= DMA_TX_FLOW_ENABLE;
        else
                hw->tx_cfg &= ~DMA_TX_FLOW_ENABLE;
        if (hw->enabled) {
                if (rx_cfg != hw->rx_cfg)
                        writel(hw->rx_cfg, hw->io + KS_DMA_RX_CTRL);
                if (tx_cfg != hw->tx_cfg)
                        writel(hw->tx_cfg, hw->io + KS_DMA_TX_CTRL);
        }
}

static void determine_flow_ctrl(struct ksz_hw *hw, struct ksz_port *port,
        u16 local, u16 remote)
{
        int rx;
        int tx;

        if (hw->overrides & PAUSE_FLOW_CTRL)
                return;

        rx = tx = 0;
        if (port->force_link)
                rx = tx = 1;
        if (remote & LPA_PAUSE_CAP) {
                if (local & ADVERTISE_PAUSE_CAP) {
                        rx = tx = 1;
                } else if ((remote & LPA_PAUSE_ASYM) &&
                           (local &
                            (ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM)) ==
                           ADVERTISE_PAUSE_ASYM) {
                        tx = 1;
                }
        } else if (remote & LPA_PAUSE_ASYM) {
                if ((local & (ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM))
                    == (ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM))
                        rx = 1;
        }
        if (!hw->ksz_switch)
                set_flow_ctrl(hw, rx, tx);
}

static inline void port_cfg_change(struct ksz_hw *hw, struct ksz_port *port,
        struct ksz_port_info *info, u16 link_status)
{
        if ((hw->features & HALF_DUPLEX_SIGNAL_BUG) &&
                        !(hw->overrides & PAUSE_FLOW_CTRL)) {
                u32 cfg = hw->tx_cfg;

                /* Disable flow control in the half duplex mode. */
                if (1 == info->duplex)
                        hw->tx_cfg &= ~DMA_TX_FLOW_ENABLE;
                if (hw->enabled && cfg != hw->tx_cfg)
                        writel(hw->tx_cfg, hw->io + KS_DMA_TX_CTRL);
        }
}

/**
 * port_get_link_speed - get current link status
 * @port:       The port instance.
 *
 * This routine reads PHY registers to determine the current link status of the
 * switch ports.
 */
static void port_get_link_speed(struct ksz_port *port)
{
        uint interrupt;
        struct ksz_port_info *info;
        struct ksz_port_info *linked = NULL;
        struct ksz_hw *hw = port->hw;
        u16 data;
        u16 status;
        u8 local;
        u8 remote;
        int i;
        int p;
        int change = 0;

        interrupt = hw_block_intr(hw);

        for (i = 0, p = port->first_port; i < port->port_cnt; i++, p++) {
                info = &hw->port_info[p];
                port_r16(hw, p, KS884X_PORT_CTRL_4_OFFSET, &data);
                port_r16(hw, p, KS884X_PORT_STATUS_OFFSET, &status);

                /*
                 * Link status is changing all the time even when there is no
                 * cable connection!
                 */
                remote = status & (PORT_AUTO_NEG_COMPLETE |
                        PORT_STATUS_LINK_GOOD);
                local = (u8) data;

                /* No change to status. */
                if (local == info->advertised && remote == info->partner)
                        continue;

                info->advertised = local;
                info->partner = remote;
                if (status & PORT_STATUS_LINK_GOOD) {

                        /* Remember the first linked port. */
                        if (!linked)
                                linked = info;

                        info->tx_rate = 10 * TX_RATE_UNIT;
                        if (status & PORT_STATUS_SPEED_100MBIT)
                                info->tx_rate = 100 * TX_RATE_UNIT;

                        info->duplex = 1;
                        if (status & PORT_STATUS_FULL_DUPLEX)
                                info->duplex = 2;

                        if (media_connected != info->state) {
                                hw_r_phy(hw, p, KS884X_PHY_AUTO_NEG_OFFSET,
                                        &data);
                                hw_r_phy(hw, p, KS884X_PHY_REMOTE_CAP_OFFSET,
                                        &status);
                                determine_flow_ctrl(hw, port, data, status);
                                if (hw->ksz_switch) {
                                        port_cfg_back_pressure(hw, p,
                                                (1 == info->duplex));
                                }
                                change |= 1 << i;
                                port_cfg_change(hw, port, info, status);
                        }
                        info->state = media_connected;
                } else {
                        if (media_disconnected != info->state) {
                                change |= 1 << i;

                                /* Indicate the link just goes down. */
                                hw->port_mib[p].link_down = 1;
                        }
                        info->state = media_disconnected;
                }
                hw->port_mib[p].state = (u8) info->state;
        }

        if (linked && media_disconnected == port->linked->state)
                port->linked = linked;

        hw_restore_intr(hw, interrupt);
}

#define PHY_RESET_TIMEOUT               10

/**
 * port_set_link_speed - set port speed
 * @port:       The port instance.
 *
 * This routine sets the link speed of the switch ports.
 */
static void port_set_link_speed(struct ksz_port *port)
{
        struct ksz_hw *hw = port->hw;
        u16 data;
        u16 cfg;
        u8 status;
        int i;
        int p;

        for (i = 0, p = port->first_port; i < port->port_cnt; i++, p++) {
                port_r16(hw, p, KS884X_PORT_CTRL_4_OFFSET, &data);
                port_r8(hw, p, KS884X_PORT_STATUS_OFFSET, &status);

                cfg = 0;
                if (status & PORT_STATUS_LINK_GOOD)
                        cfg = data;

                data |= PORT_AUTO_NEG_ENABLE;
                data = advertised_flow_ctrl(port, data);

                data |= PORT_AUTO_NEG_100BTX_FD | PORT_AUTO_NEG_100BTX |
                        PORT_AUTO_NEG_10BT_FD | PORT_AUTO_NEG_10BT;

                /* Check if manual configuration is specified by the user. */
                if (port->speed || port->duplex) {
                        if (10 == port->speed)
                                data &= ~(PORT_AUTO_NEG_100BTX_FD |
                                        PORT_AUTO_NEG_100BTX);
                        else if (100 == port->speed)
                                data &= ~(PORT_AUTO_NEG_10BT_FD |
                                        PORT_AUTO_NEG_10BT);
                        if (1 == port->duplex)
                                data &= ~(PORT_AUTO_NEG_100BTX_FD |
                                        PORT_AUTO_NEG_10BT_FD);
                        else if (2 == port->duplex)
                                data &= ~(PORT_AUTO_NEG_100BTX |
                                        PORT_AUTO_NEG_10BT);
                }
                if (data != cfg) {
                        data |= PORT_AUTO_NEG_RESTART;
                        port_w16(hw, p, KS884X_PORT_CTRL_4_OFFSET, data);
                }
        }
}

/**
 * port_force_link_speed - force port speed
 * @port:       The port instance.
 *
 * This routine forces the link speed of the switch ports.
 */
static void port_force_link_speed(struct ksz_port *port)
{
        struct ksz_hw *hw = port->hw;
        u16 data;
        int i;
        int phy;
        int p;

        for (i = 0, p = port->first_port; i < port->port_cnt; i++, p++) {
                phy = KS884X_PHY_1_CTRL_OFFSET + p * PHY_CTRL_INTERVAL;
                hw_r_phy_ctrl(hw, phy, &data);

                data &= ~BMCR_ANENABLE;

                if (10 == port->speed)
                        data &= ~BMCR_SPEED100;
                else if (100 == port->speed)
                        data |= BMCR_SPEED100;
                if (1 == port->duplex)
                        data &= ~BMCR_FULLDPLX;
                else if (2 == port->duplex)
                        data |= BMCR_FULLDPLX;
                hw_w_phy_ctrl(hw, phy, data);
        }
}

static void port_set_power_saving(struct ksz_port *port, int enable)
{
        struct ksz_hw *hw = port->hw;
        int i;
        int p;

        for (i = 0, p = port->first_port; i < port->port_cnt; i++, p++)
                port_cfg(hw, p,
                        KS884X_PORT_CTRL_4_OFFSET, PORT_POWER_DOWN, enable);
}

/*
 * KSZ8841 power management functions
 */

/**
 * hw_chk_wol_pme_status - check PMEN pin
 * @hw:         The hardware instance.
 *
 * This function is used to check PMEN pin is asserted.
 *
 * Return 1 if PMEN pin is asserted; otherwise, 0.
 */
static int hw_chk_wol_pme_status(struct ksz_hw *hw)
{
        struct dev_info *hw_priv = container_of(hw, struct dev_info, hw);
        struct pci_dev *pdev = hw_priv->pdev;
        u16 data;

        if (!pdev->pm_cap)
                return 0;
        pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &data);
        return (data & PCI_PM_CTRL_PME_STATUS) == PCI_PM_CTRL_PME_STATUS;
}

/**
 * hw_clr_wol_pme_status - clear PMEN pin
 * @hw:         The hardware instance.
 *
 * This routine is used to clear PME_Status to deassert PMEN pin.
 */
static void hw_clr_wol_pme_status(struct ksz_hw *hw)
{
        struct dev_info *hw_priv = container_of(hw, struct dev_info, hw);
        struct pci_dev *pdev = hw_priv->pdev;
        u16 data;

        if (!pdev->pm_cap)
                return;

        /* Clear PME_Status to deassert PMEN pin. */
        pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &data);
        data |= PCI_PM_CTRL_PME_STATUS;
        pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, data);
}

/**
 * hw_cfg_wol_pme - enable or disable Wake-on-LAN
 * @hw:         The hardware instance.
 * @set:        The flag indicating whether to enable or disable.
 *
 * This routine is used to enable or disable Wake-on-LAN.
 */
static void hw_cfg_wol_pme(struct ksz_hw *hw, int set)
{
        struct dev_info *hw_priv = container_of(hw, struct dev_info, hw);
        struct pci_dev *pdev = hw_priv->pdev;
        u16 data;

        if (!pdev->pm_cap)
                return;
        pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &data);
        data &= ~PCI_PM_CTRL_STATE_MASK;
        if (set)
                data |= PCI_PM_CTRL_PME_ENABLE | PCI_D3hot;
        else
                data &= ~PCI_PM_CTRL_PME_ENABLE;
        pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, data);
}

/**
 * hw_cfg_wol - configure Wake-on-LAN features
 * @hw:         The hardware instance.
 * @frame:      The pattern frame bit.
 * @set:        The flag indicating whether to enable or disable.
 *
 * This routine is used to enable or disable certain Wake-on-LAN features.
 */
static void hw_cfg_wol(struct ksz_hw *hw, u16 frame, int set)
{
        u16 data;

        data = readw(hw->io + KS8841_WOL_CTRL_OFFSET);
        if (set)
                data |= frame;
        else
                data &= ~frame;
        writew(data, hw->io + KS8841_WOL_CTRL_OFFSET);
}

/**
 * hw_set_wol_frame - program Wake-on-LAN pattern
 * @hw:         The hardware instance.
 * @i:          The frame index.
 * @mask_size:  The size of the mask.
 * @mask:       Mask to ignore certain bytes in the pattern.
 * @frame_size: The size of the frame.
 * @pattern:    The frame data.
 *
 * This routine is used to program Wake-on-LAN pattern.
 */
static void hw_set_wol_frame(struct ksz_hw *hw, int i, uint mask_size,
        const u8 *mask, uint frame_size, const u8 *pattern)
{
        int bits;
        int from;
        int len;
        int to;
        u32 crc;
        u8 data[64];
        u8 val = 0;

        if (frame_size > mask_size * 8)
                frame_size = mask_size * 8;
        if (frame_size > 64)
                frame_size = 64;

        i *= 0x10;
        writel(0, hw->io + KS8841_WOL_FRAME_BYTE0_OFFSET + i);
        writel(0, hw->io + KS8841_WOL_FRAME_BYTE2_OFFSET + i);

        bits = len = from = to = 0;
        do {
                if (bits) {
                        if ((val & 1))
                                data[to++] = pattern[from];
                        val >>= 1;
                        ++from;
                        --bits;
                } else {
                        val = mask[len];
                        writeb(val, hw->io + KS8841_WOL_FRAME_BYTE0_OFFSET + i
                                + len);
                        ++len;
                        if (val)
                                bits = 8;
                        else
                                from += 8;
                }
        } while (from < (int) frame_size);
        if (val) {
                bits = mask[len - 1];
                val <<= (from % 8);
                bits &= ~val;
                writeb(bits, hw->io + KS8841_WOL_FRAME_BYTE0_OFFSET + i + len -
                        1);
        }
        crc = ether_crc(to, data);
        writel(crc, hw->io + KS8841_WOL_FRAME_CRC_OFFSET + i);
}

/**
 * hw_add_wol_arp - add ARP pattern
 * @hw:         The hardware instance.
 * @ip_addr:    The IPv4 address assigned to the device.
 *
 * This routine is used to add ARP pattern for waking up the host.
 */
static void hw_add_wol_arp(struct ksz_hw *hw, const u8 *ip_addr)
{
        static const u8 mask[6] = { 0x3F, 0xF0, 0x3F, 0x00, 0xC0, 0x03 };
        u8 pattern[42] = {
                0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x08, 0x06,
                0x00, 0x01, 0x08, 0x00, 0x06, 0x04, 0x00, 0x01,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00 };

        memcpy(&pattern[38], ip_addr, 4);
        hw_set_wol_frame(hw, 3, 6, mask, 42, pattern);
}

/**
 * hw_add_wol_bcast - add broadcast pattern
 * @hw:         The hardware instance.
 *
 * This routine is used to add broadcast pattern for waking up the host.
 */
static void hw_add_wol_bcast(struct ksz_hw *hw)
{
        static const u8 mask[] = { 0x3F };
        static const u8 pattern[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };

        hw_set_wol_frame(hw, 2, 1, mask, ETH_ALEN, pattern);
}

/**
 * hw_add_wol_mcast - add multicast pattern
 * @hw:         The hardware instance.
 *
 * This routine is used to add multicast pattern for waking up the host.
 *
 * It is assumed the multicast packet is the ICMPv6 neighbor solicitation used
 * by IPv6 ping command.  Note that multicast packets are filtred through the
 * multicast hash table, so not all multicast packets can wake up the host.
 */
static void hw_add_wol_mcast(struct ksz_hw *hw)
{
        static const u8 mask[] = { 0x3F };
        u8 pattern[] = { 0x33, 0x33, 0xFF, 0x00, 0x00, 0x00 };

        memcpy(&pattern[3], &hw->override_addr[3], 3);
        hw_set_wol_frame(hw, 1, 1, mask, 6, pattern);
}

/**
 * hw_add_wol_ucast - add unicast pattern
 * @hw:         The hardware instance.
 *
 * This routine is used to add unicast pattern to wakeup the host.
 *
 * It is assumed the unicast packet is directed to the device, as the hardware
 * can only receive them in normal case.
 */
static void hw_add_wol_ucast(struct ksz_hw *hw)
{
        static const u8 mask[] = { 0x3F };

        hw_set_wol_frame(hw, 0, 1, mask, ETH_ALEN, hw->override_addr);
}

/**
 * hw_enable_wol - enable Wake-on-LAN
 * @hw:         The hardware instance.
 * @wol_enable: The Wake-on-LAN settings.
 * @net_addr:   The IPv4 address assigned to the device.
 *
 * This routine is used to enable Wake-on-LAN depending on driver settings.
 */
static void hw_enable_wol(struct ksz_hw *hw, u32 wol_enable, const u8 *net_addr)
{
        hw_cfg_wol(hw, KS8841_WOL_MAGIC_ENABLE, (wol_enable & WAKE_MAGIC));
        hw_cfg_wol(hw, KS8841_WOL_FRAME0_ENABLE, (wol_enable & WAKE_UCAST));
        hw_add_wol_ucast(hw);
        hw_cfg_wol(hw, KS8841_WOL_FRAME1_ENABLE, (wol_enable & WAKE_MCAST));
        hw_add_wol_mcast(hw);
        hw_cfg_wol(hw, KS8841_WOL_FRAME2_ENABLE, (wol_enable & WAKE_BCAST));
        hw_cfg_wol(hw, KS8841_WOL_FRAME3_ENABLE, (wol_enable & WAKE_ARP));
        hw_add_wol_arp(hw, net_addr);
}

/**
 * hw_init - check driver is correct for the hardware
 * @hw:         The hardware instance.
 *
 * This function checks the hardware is correct for this driver and sets the
 * hardware up for proper initialization.
 *
 * Return number of ports or 0 if not right.
 */
static int hw_init(struct ksz_hw *hw)
{
        int rc = 0;
        u16 data;
        u16 revision;

        /* Set bus speed to 125MHz. */
        writew(BUS_SPEED_125_MHZ, hw->io + KS884X_BUS_CTRL_OFFSET);

        /* Check KSZ884x chip ID. */
        data = readw(hw->io + KS884X_CHIP_ID_OFFSET);

        revision = (data & KS884X_REVISION_MASK) >> KS884X_REVISION_SHIFT;
        data &= KS884X_CHIP_ID_MASK_41;
        if (REG_CHIP_ID_41 == data)
                rc = 1;
        else if (REG_CHIP_ID_42 == data)
                rc = 2;
        else
                return 0;

        /* Setup hardware features or bug workarounds. */
        if (revision <= 1) {
                hw->features |= SMALL_PACKET_TX_BUG;
                if (1 == rc)
                        hw->features |= HALF_DUPLEX_SIGNAL_BUG;
        }
        return rc;
}

/**
 * hw_reset - reset the hardware
 * @hw:         The hardware instance.
 *
 * This routine resets the hardware.
 */
static void hw_reset(struct ksz_hw *hw)
{
        writew(GLOBAL_SOFTWARE_RESET, hw->io + KS884X_GLOBAL_CTRL_OFFSET);

        /* Wait for device to reset. */
        mdelay(10);

        /* Write 0 to clear device reset. */
        writew(0, hw->io + KS884X_GLOBAL_CTRL_OFFSET);
}

/**
 * hw_setup - setup the hardware
 * @hw:         The hardware instance.
 *
 * This routine setup the hardware for proper operation.
 */
static void hw_setup(struct ksz_hw *hw)
{
#if SET_DEFAULT_LED
        u16 data;

        /* Change default LED mode. */
        data = readw(hw->io + KS8842_SWITCH_CTRL_5_OFFSET);
        data &= ~LED_MODE;
        data |= SET_DEFAULT_LED;
        writew(data, hw->io + KS8842_SWITCH_CTRL_5_OFFSET);
#endif

        /* Setup transmit control. */
        hw->tx_cfg = (DMA_TX_PAD_ENABLE | DMA_TX_CRC_ENABLE |
                (DMA_BURST_DEFAULT << DMA_BURST_SHIFT) | DMA_TX_ENABLE);

        /* Setup receive control. */
        hw->rx_cfg = (DMA_RX_BROADCAST | DMA_RX_UNICAST |
                (DMA_BURST_DEFAULT << DMA_BURST_SHIFT) | DMA_RX_ENABLE);
        hw->rx_cfg |= KS884X_DMA_RX_MULTICAST;

        /* Hardware cannot handle UDP packet in IP fragments. */
        hw->rx_cfg |= (DMA_RX_CSUM_TCP | DMA_RX_CSUM_IP);

        if (hw->all_multi)
                hw->rx_cfg |= DMA_RX_ALL_MULTICAST;
        if (hw->promiscuous)
                hw->rx_cfg |= DMA_RX_PROMISCUOUS;
}

/**
 * hw_setup_intr - setup interrupt mask
 * @hw:         The hardware instance.
 *
 * This routine setup the interrupt mask for proper operation.
 */
static void hw_setup_intr(struct ksz_hw *hw)
{
        hw->intr_mask = KS884X_INT_MASK | KS884X_INT_RX_OVERRUN;
}

static void ksz_check_desc_num(struct ksz_desc_info *info)
{
#define MIN_DESC_SHIFT  2

        int alloc = info->alloc;
        int shift;

        shift = 0;
        while (!(alloc & 1)) {
                shift++;
                alloc >>= 1;
        }
        if (alloc != 1 || shift < MIN_DESC_SHIFT) {
                pr_alert("Hardware descriptor numbers not right!\n");
                while (alloc) {
                        shift++;
                        alloc >>= 1;
                }
                if (shift < MIN_DESC_SHIFT)
                        shift = MIN_DESC_SHIFT;
                alloc = 1 << shift;
                info->alloc = alloc;
        }
        info->mask = info->alloc - 1;
}

static void hw_init_desc(struct ksz_desc_info *desc_info, int transmit)
{
        int i;
        u32 phys = desc_info->ring_phys;
        struct ksz_hw_desc *desc = desc_info->ring_virt;
        struct ksz_desc *cur = desc_info->ring;
        struct ksz_desc *previous = NULL;

        for (i = 0; i < desc_info->alloc; i++) {
                cur->phw = desc++;
                phys += desc_info->size;
                previous = cur++;
                previous->phw->next = cpu_to_le32(phys);
        }
        previous->phw->next = cpu_to_le32(desc_info->ring_phys);
        previous->sw.buf.rx.end_of_ring = 1;
        previous->phw->buf.data = cpu_to_le32(previous->sw.buf.data);

        desc_info->avail = desc_info->alloc;
        desc_info->last = desc_info->next = 0;

        desc_info->cur = desc_info->ring;
}

/**
 * hw_set_desc_base - set descriptor base addresses
 * @hw:         The hardware instance.
 * @tx_addr:    The transmit descriptor base.
 * @rx_addr:    The receive descriptor base.
 *
 * This routine programs the descriptor base addresses after reset.
 */
static void hw_set_desc_base(struct ksz_hw *hw, u32 tx_addr, u32 rx_addr)
{
        /* Set base address of Tx/Rx descriptors. */
        writel(tx_addr, hw->io + KS_DMA_TX_ADDR);
        writel(rx_addr, hw->io + KS_DMA_RX_ADDR);
}

static void hw_reset_pkts(struct ksz_desc_info *info)
{
        info->cur = info->ring;
        info->avail = info->alloc;
        info->last = info->next = 0;
}

static inline void hw_resume_rx(struct ksz_hw *hw)
{
        writel(DMA_START, hw->io + KS_DMA_RX_START);
}

/**
 * hw_start_rx - start receiving
 * @hw:         The hardware instance.
 *
 * This routine starts the receive function of the hardware.
 */
static void hw_start_rx(struct ksz_hw *hw)
{
        writel(hw->rx_cfg, hw->io + KS_DMA_RX_CTRL);

        /* Notify when the receive stops. */
        hw->intr_mask |= KS884X_INT_RX_STOPPED;

        writel(DMA_START, hw->io + KS_DMA_RX_START);
        hw_ack_intr(hw, KS884X_INT_RX_STOPPED);
        hw->rx_stop++;

        /* Variable overflows. */
        if (0 == hw->rx_stop)
                hw->rx_stop = 2;
}

/**
 * hw_stop_rx - stop receiving
 * @hw:         The hardware instance.
 *
 * This routine stops the receive function of the hardware.
 */
static void hw_stop_rx(struct ksz_hw *hw)
{
        hw->rx_stop = 0;
        hw_turn_off_intr(hw, KS884X_INT_RX_STOPPED);
        writel((hw->rx_cfg & ~DMA_RX_ENABLE), hw->io + KS_DMA_RX_CTRL);
}

/**
 * hw_start_tx - start transmitting
 * @hw:         The hardware instance.
 *
 * This routine starts the transmit function of the hardware.
 */
static void hw_start_tx(struct ksz_hw *hw)
{
        writel(hw->tx_cfg, hw->io + KS_DMA_TX_CTRL);
}

/**
 * hw_stop_tx - stop transmitting
 * @hw:         The hardware instance.
 *
 * This routine stops the transmit function of the hardware.
 */
static void hw_stop_tx(struct ksz_hw *hw)
{
        writel((hw->tx_cfg & ~DMA_TX_ENABLE), hw->io + KS_DMA_TX_CTRL);
}

/**
 * hw_disable - disable hardware
 * @hw:         The hardware instance.
 *
 * This routine disables the hardware.
 */
static void hw_disable(struct ksz_hw *hw)
{
        hw_stop_rx(hw);
        hw_stop_tx(hw);
        hw->enabled = 0;
}

/**
 * hw_enable - enable hardware
 * @hw:         The hardware instance.
 *
 * This routine enables the hardware.
 */
static void hw_enable(struct ksz_hw *hw)
{
        hw_start_tx(hw);
        hw_start_rx(hw);
        hw->enabled = 1;
}

/**
 * hw_alloc_pkt - allocate enough descriptors for transmission
 * @hw:         The hardware instance.
 * @length:     The length of the packet.
 * @physical:   Number of descriptors required.
 *
 * This function allocates descriptors for transmission.
 *
 * Return 0 if not successful; 1 for buffer copy; or number of descriptors.
 */
static int hw_alloc_pkt(struct ksz_hw *hw, int length, int physical)
{
        /* Always leave one descriptor free. */
        if (hw->tx_desc_info.avail <= 1)
                return 0;

        /* Allocate a descriptor for transmission and mark it current. */
        get_tx_pkt(&hw->tx_desc_info, &hw->tx_desc_info.cur);
        hw->tx_desc_info.cur->sw.buf.tx.first_seg = 1;

        /* Keep track of number of transmit descriptors used so far. */
        ++hw->tx_int_cnt;
        hw->tx_size += length;

        /* Cannot hold on too much data. */
        if (hw->tx_size >= MAX_TX_HELD_SIZE)
                hw->tx_int_cnt = hw->tx_int_mask + 1;

        if (physical > hw->tx_desc_info.avail)
                return 1;

        return hw->tx_desc_info.avail;
}

/**
 * hw_send_pkt - mark packet for transmission
 * @hw:         The hardware instance.
 *
 * This routine marks the packet for transmission in PCI version.
 */
static void hw_send_pkt(struct ksz_hw *hw)
{
        struct ksz_desc *cur = hw->tx_desc_info.cur;

        cur->sw.buf.tx.last_seg = 1;

        /* Interrupt only after specified number of descriptors used. */
        if (hw->tx_int_cnt > hw->tx_int_mask) {
                cur->sw.buf.tx.intr = 1;
                hw->tx_int_cnt = 0;
                hw->tx_size = 0;
        }

        /* KSZ8842 supports port directed transmission. */
        cur->sw.buf.tx.dest_port = hw->dst_ports;

        release_desc(cur);

        writel(0, hw->io + KS_DMA_TX_START);
}

static int empty_addr(u8 *addr)
{
        u32 *addr1 = (u32 *) addr;
        u16 *addr2 = (u16 *) &addr[4];

        return 0 == *addr1 && 0 == *addr2;
}

/**
 * hw_set_addr - set MAC address
 * @hw:         The hardware instance.
 *
 * This routine programs the MAC address of the hardware when the address is
 * overridden.
 */
static void hw_set_addr(struct ksz_hw *hw)
{
        int i;

        for (i = 0; i < ETH_ALEN; i++)
                writeb(hw->override_addr[MAC_ADDR_ORDER(i)],
                        hw->io + KS884X_ADDR_0_OFFSET + i);

        sw_set_addr(hw, hw->override_addr);
}

/**
 * hw_read_addr - read MAC address
 * @hw:         The hardware instance.
 *
 * This routine retrieves the MAC address of the hardware.
 */
static void hw_read_addr(struct ksz_hw *hw)
{
        int i;

        for (i = 0; i < ETH_ALEN; i++)
                hw->perm_addr[MAC_ADDR_ORDER(i)] = readb(hw->io +
                        KS884X_ADDR_0_OFFSET + i);

        if (!hw->mac_override) {
                memcpy(hw->override_addr, hw->perm_addr, ETH_ALEN);
                if (empty_addr(hw->override_addr)) {
                        memcpy(hw->perm_addr, DEFAULT_MAC_ADDRESS, ETH_ALEN);
                        memcpy(hw->override_addr, DEFAULT_MAC_ADDRESS,
                               ETH_ALEN);
                        hw->override_addr[5] += hw->id;
                        hw_set_addr(hw);
                }
        }
}

static void hw_ena_add_addr(struct ksz_hw *hw, int index, u8 *mac_addr)
{
        int i;
        u32 mac_addr_lo;
        u32 mac_addr_hi;

        mac_addr_hi = 0;
        for (i = 0; i < 2; i++) {
                mac_addr_hi <<= 8;
                mac_addr_hi |= mac_addr[i];
        }
        mac_addr_hi |= ADD_ADDR_ENABLE;
        mac_addr_lo = 0;
        for (i = 2; i < 6; i++) {
                mac_addr_lo <<= 8;
                mac_addr_lo |= mac_addr[i];
        }
        index *= ADD_ADDR_INCR;

        writel(mac_addr_lo, hw->io + index + KS_ADD_ADDR_0_LO);
        writel(mac_addr_hi, hw->io + index + KS_ADD_ADDR_0_HI);
}

static void hw_set_add_addr(struct ksz_hw *hw)
{
        int i;

        for (i = 0; i < ADDITIONAL_ENTRIES; i++) {
                if (empty_addr(hw->address[i]))
                        writel(0, hw->io + ADD_ADDR_INCR * i +
                                KS_ADD_ADDR_0_HI);
                else
                        hw_ena_add_addr(hw, i, hw->address[i]);
        }
}

static int hw_add_addr(struct ksz_hw *hw, u8 *mac_addr)
{
        int i;
        int j = ADDITIONAL_ENTRIES;

        if (ether_addr_equal(hw->override_addr, mac_addr))
                return 0;
        for (i = 0; i < hw->addr_list_size; i++) {
                if (ether_addr_equal(hw->address[i], mac_addr))
                        return 0;
                if (ADDITIONAL_ENTRIES == j && empty_addr(hw->address[i]))
                        j = i;
        }
        if (j < ADDITIONAL_ENTRIES) {
                memcpy(hw->address[j], mac_addr, ETH_ALEN);
                hw_ena_add_addr(hw, j, hw->address[j]);
                return 0;
        }
        return -1;
}

static int hw_del_addr(struct ksz_hw *hw, u8 *mac_addr)
{
        int i;

        for (i = 0; i < hw->addr_list_size; i++) {
                if (ether_addr_equal(hw->address[i], mac_addr)) {
                        eth_zero_addr(hw->address[i]);
                        writel(0, hw->io + ADD_ADDR_INCR * i +
                                KS_ADD_ADDR_0_HI);
                        return 0;
                }
        }
        return -1;
}

/**
 * hw_clr_multicast - clear multicast addresses
 * @hw:         The hardware instance.
 *
 * This routine removes all multicast addresses set in the hardware.
 */
static void hw_clr_multicast(struct ksz_hw *hw)
{
        int i;

        for (i = 0; i < HW_MULTICAST_SIZE; i++) {
                hw->multi_bits[i] = 0;

                writeb(0, hw->io + KS884X_MULTICAST_0_OFFSET + i);
        }
}

/**
 * hw_set_grp_addr - set multicast addresses
 * @hw:         The hardware instance.
 *
 * This routine programs multicast addresses for the hardware to accept those
 * addresses.
 */
static void hw_set_grp_addr(struct ksz_hw *hw)
{
        int i;
        int index;
        int position;
        int value;

        memset(hw->multi_bits, 0, sizeof(u8) * HW_MULTICAST_SIZE);

        for (i = 0; i < hw->multi_list_size; i++) {
                position = (ether_crc(6, hw->multi_list[i]) >> 26) & 0x3f;
                index = position >> 3;
                value = 1 << (position & 7);
                hw->multi_bits[index] |= (u8) value;
        }

        for (i = 0; i < HW_MULTICAST_SIZE; i++)
                writeb(hw->multi_bits[i], hw->io + KS884X_MULTICAST_0_OFFSET +
                        i);
}

/**
 * hw_set_multicast - enable or disable all multicast receiving
 * @hw:         The hardware instance.
 * @multicast:  To turn on or off the all multicast feature.
 *
 * This routine enables/disables the hardware to accept all multicast packets.
 */
static void hw_set_multicast(struct ksz_hw *hw, u8 multicast)
{
        /* Stop receiving for reconfiguration. */
        hw_stop_rx(hw);

        if (multicast)
                hw->rx_cfg |= DMA_RX_ALL_MULTICAST;
        else
                hw->rx_cfg &= ~DMA_RX_ALL_MULTICAST;

        if (hw->enabled)
                hw_start_rx(hw);
}

/**
 * hw_set_promiscuous - enable or disable promiscuous receiving
 * @hw:         The hardware instance.
 * @prom:       To turn on or off the promiscuous feature.
 *
 * This routine enables/disables the hardware to accept all packets.
 */
static void hw_set_promiscuous(struct ksz_hw *hw, u8 prom)
{
        /* Stop receiving for reconfiguration. */
        hw_stop_rx(hw);

        if (prom)
                hw->rx_cfg |= DMA_RX_PROMISCUOUS;
        else
                hw->rx_cfg &= ~DMA_RX_PROMISCUOUS;

        if (hw->enabled)
                hw_start_rx(hw);
}

/**
 * sw_enable - enable the switch
 * @hw:         The hardware instance.
 * @enable:     The flag to enable or disable the switch
 *
 * This routine is used to enable/disable the switch in KSZ8842.
 */
static void sw_enable(struct ksz_hw *hw, int enable)
{
        int port;

        for (port = 0; port < SWITCH_PORT_NUM; port++) {
                if (hw->dev_count > 1) {
                        /* Set port-base vlan membership with host port. */
                        sw_cfg_port_base_vlan(hw, port,
                                HOST_MASK | (1 << port));
                        port_set_stp_state(hw, port, STP_STATE_DISABLED);
                } else {
                        sw_cfg_port_base_vlan(hw, port, PORT_MASK);
                        port_set_stp_state(hw, port, STP_STATE_FORWARDING);
                }
        }
        if (hw->dev_count > 1)
                port_set_stp_state(hw, SWITCH_PORT_NUM, STP_STATE_SIMPLE);
        else
                port_set_stp_state(hw, SWITCH_PORT_NUM, STP_STATE_FORWARDING);

        if (enable)
                enable = KS8842_START;
        writew(enable, hw->io + KS884X_CHIP_ID_OFFSET);
}

/**
 * sw_setup - setup the switch
 * @hw:         The hardware instance.
 *
 * This routine setup the hardware switch engine for default operation.
 */
static void sw_setup(struct ksz_hw *hw)
{
        int port;

        sw_set_global_ctrl(hw);

        /* Enable switch broadcast storm protection at 10% percent rate. */
        sw_init_broad_storm(hw);
        hw_cfg_broad_storm(hw, BROADCAST_STORM_PROTECTION_RATE);
        for (port = 0; port < SWITCH_PORT_NUM; port++)
                sw_ena_broad_storm(hw, port);

        sw_init_prio(hw);

        sw_init_mirror(hw);

        sw_init_prio_rate(hw);

        sw_init_vlan(hw);

        if (hw->features & STP_SUPPORT)
                sw_init_stp(hw);
        if (!sw_chk(hw, KS8842_SWITCH_CTRL_1_OFFSET,
                        SWITCH_TX_FLOW_CTRL | SWITCH_RX_FLOW_CTRL))
                hw->overrides |= PAUSE_FLOW_CTRL;
        sw_enable(hw, 1);
}

/**
 * ksz_start_timer - start kernel timer
 * @info:       Kernel timer information.
 * @time:       The time tick.
 *
 * This routine starts the kernel timer after the specified time tick.
 */
static void ksz_start_timer(struct ksz_timer_info *info, int time)
{
        info->cnt = 0;
        info->timer.expires = jiffies + time;
        add_timer(&info->timer);

        /* infinity */
        info->max = -1;
}

/**
 * ksz_stop_timer - stop kernel timer
 * @info:       Kernel timer information.
 *
 * This routine stops the kernel timer.
 */
static void ksz_stop_timer(struct ksz_timer_info *info)
{
        if (info->max) {
                info->max = 0;
                del_timer_sync(&info->timer);
        }
}

static void ksz_init_timer(struct ksz_timer_info *info, int period,
        void (*function)(struct timer_list *))
{
        info->max = 0;
        info->period = period;
        timer_setup(&info->timer, function, 0);
}

static void ksz_update_timer(struct ksz_timer_info *info)
{
        ++info->cnt;
        if (info->max > 0) {
                if (info->cnt < info->max) {
                        info->timer.expires = jiffies + info->period;
                        add_timer(&info->timer);
                } else
                        info->max = 0;
        } else if (info->max < 0) {
                info->timer.expires = jiffies + info->period;
                add_timer(&info->timer);
        }
}

/**
 * ksz_alloc_soft_desc - allocate software descriptors
 * @desc_info:  Descriptor information structure.
 * @transmit:   Indication that descriptors are for transmit.
 *
 * This local function allocates software descriptors for manipulation in
 * memory.
 *
 * Return 0 if successful.
 */
static int ksz_alloc_soft_desc(struct ksz_desc_info *desc_info, int transmit)
{
        desc_info->ring = kcalloc(desc_info->alloc, sizeof(struct ksz_desc),
                                  GFP_KERNEL);
        if (!desc_info->ring)
                return 1;
        hw_init_desc(desc_info, transmit);
        return 0;
}

/**
 * ksz_alloc_desc - allocate hardware descriptors
 * @adapter:    Adapter information structure.
 *
 * This local function allocates hardware descriptors for receiving and
 * transmitting.
 *
 * Return 0 if successful.
 */
static int ksz_alloc_desc(struct dev_info *adapter)
{
        struct ksz_hw *hw = &adapter->hw;
        int offset;

        /* Allocate memory for RX & TX descriptors. */
        adapter->desc_pool.alloc_size =
                hw->rx_desc_info.size * hw->rx_desc_info.alloc +
                hw->tx_desc_info.size * hw->tx_desc_info.alloc +
                DESC_ALIGNMENT;

        adapter->desc_pool.alloc_virt =
                dma_alloc_coherent(&adapter->pdev->dev,
                                   adapter->desc_pool.alloc_size,
                                   &adapter->desc_pool.dma_addr, GFP_KERNEL);
        if (adapter->desc_pool.alloc_virt == NULL) {
                adapter->desc_pool.alloc_size = 0;
                return 1;
        }

        /* Align to the next cache line boundary. */
        offset = (((ulong) adapter->desc_pool.alloc_virt % DESC_ALIGNMENT) ?
                (DESC_ALIGNMENT -
                ((ulong) adapter->desc_pool.alloc_virt % DESC_ALIGNMENT)) : 0);
        adapter->desc_pool.virt = adapter->desc_pool.alloc_virt + offset;
        adapter->desc_pool.phys = adapter->desc_pool.dma_addr + offset;

        /* Allocate receive/transmit descriptors. */
        hw->rx_desc_info.ring_virt = (struct ksz_hw_desc *)
                adapter->desc_pool.virt;
        hw->rx_desc_info.ring_phys = adapter->desc_pool.phys;
        offset = hw->rx_desc_info.alloc * hw->rx_desc_info.size;
        hw->tx_desc_info.ring_virt = (struct ksz_hw_desc *)
                (adapter->desc_pool.virt + offset);
        hw->tx_desc_info.ring_phys = adapter->desc_pool.phys + offset;

        if (ksz_alloc_soft_desc(&hw->rx_desc_info, 0))
                return 1;
        if (ksz_alloc_soft_desc(&hw->tx_desc_info, 1))
                return 1;

        return 0;
}

/**
 * free_dma_buf - release DMA buffer resources
 * @adapter:    Adapter information structure.
 * @dma_buf:    pointer to buf
 * @direction:  to or from device
 *
 * This routine is just a helper function to release the DMA buffer resources.
 */
static void free_dma_buf(struct dev_info *adapter, struct ksz_dma_buf *dma_buf,
        int direction)
{
        dma_unmap_single(&adapter->pdev->dev, dma_buf->dma, dma_buf->len,
                         direction);
        dev_kfree_skb(dma_buf->skb);
        dma_buf->skb = NULL;
        dma_buf->dma = 0;
}

/**
 * ksz_init_rx_buffers - initialize receive descriptors
 * @adapter:    Adapter information structure.
 *
 * This routine initializes DMA buffers for receiving.
 */
static void ksz_init_rx_buffers(struct dev_info *adapter)
{
        int i;
        struct ksz_desc *desc;
        struct ksz_dma_buf *dma_buf;
        struct ksz_hw *hw = &adapter->hw;
        struct ksz_desc_info *info = &hw->rx_desc_info;

        for (i = 0; i < hw->rx_desc_info.alloc; i++) {
                get_rx_pkt(info, &desc);

                dma_buf = DMA_BUFFER(desc);
                if (dma_buf->skb && dma_buf->len != adapter->mtu)
                        free_dma_buf(adapter, dma_buf, DMA_FROM_DEVICE);
                dma_buf->len = adapter->mtu;
                if (!dma_buf->skb)
                        dma_buf->skb = alloc_skb(dma_buf->len, GFP_ATOMIC);
                if (dma_buf->skb && !dma_buf->dma)
                        dma_buf->dma = dma_map_single(&adapter->pdev->dev,
                                                skb_tail_pointer(dma_buf->skb),
                                                dma_buf->len,
                                                DMA_FROM_DEVICE);

                /* Set descriptor. */
                set_rx_buf(desc, dma_buf->dma);
                set_rx_len(desc, dma_buf->len);
                release_desc(desc);
        }
}

/**
 * ksz_alloc_mem - allocate memory for hardware descriptors
 * @adapter:    Adapter information structure.
 *
 * This function allocates memory for use by hardware descriptors for receiving
 * and transmitting.
 *
 * Return 0 if successful.
 */
static int ksz_alloc_mem(struct dev_info *adapter)
{
        struct ksz_hw *hw = &adapter->hw;

        /* Determine the number of receive and transmit descriptors. */
        hw->rx_desc_info.alloc = NUM_OF_RX_DESC;
        hw->tx_desc_info.alloc = NUM_OF_TX_DESC;

        /* Determine how many descriptors to skip transmit interrupt. */
        hw->tx_int_cnt = 0;
        hw->tx_int_mask = NUM_OF_TX_DESC / 4;
        if (hw->tx_int_mask > 8)
                hw->tx_int_mask = 8;
        while (hw->tx_int_mask) {
                hw->tx_int_cnt++;
                hw->tx_int_mask >>= 1;
        }
        if (hw->tx_int_cnt) {
                hw->tx_int_mask = (1 << (hw->tx_int_cnt - 1)) - 1;
                hw->tx_int_cnt = 0;
        }

        /* Determine the descriptor size. */
        hw->rx_desc_info.size =
                (((sizeof(struct ksz_hw_desc) + DESC_ALIGNMENT - 1) /
                DESC_ALIGNMENT) * DESC_ALIGNMENT);
        hw->tx_desc_info.size =
                (((sizeof(struct ksz_hw_desc) + DESC_ALIGNMENT - 1) /
                DESC_ALIGNMENT) * DESC_ALIGNMENT);
        if (hw->rx_desc_info.size != sizeof(struct ksz_hw_desc))
                pr_alert("Hardware descriptor size not right!\n");
        ksz_check_desc_num(&hw->rx_desc_info);
        ksz_check_desc_num(&hw->tx_desc_info);

        /* Allocate descriptors. */
        if (ksz_alloc_desc(adapter))
                return 1;

        return 0;
}

/**
 * ksz_free_desc - free software and hardware descriptors
 * @adapter:    Adapter information structure.
 *
 * This local routine frees the software and hardware descriptors allocated by
 * ksz_alloc_desc().
 */
static void ksz_free_desc(struct dev_info *adapter)
{
        struct ksz_hw *hw = &adapter->hw;

        /* Reset descriptor. */
        hw->rx_desc_info.ring_virt = NULL;
        hw->tx_desc_info.ring_virt = NULL;
        hw->rx_desc_info.ring_phys = 0;
        hw->tx_desc_info.ring_phys = 0;

        /* Free memory. */
        if (adapter->desc_pool.alloc_virt)
                dma_free_coherent(&adapter->pdev->dev,
                                  adapter->desc_pool.alloc_size,
                                  adapter->desc_pool.alloc_virt,
                                  adapter->desc_pool.dma_addr);

        /* Reset resource pool. */
        adapter->desc_pool.alloc_size = 0;
        adapter->desc_pool.alloc_virt = NULL;

        kfree(hw->rx_desc_info.ring);
        hw->rx_desc_info.ring = NULL;
        kfree(hw->tx_desc_info.ring);
        hw->tx_desc_info.ring = NULL;
}

/**
 * ksz_free_buffers - free buffers used in the descriptors
 * @adapter:    Adapter information structure.
 * @desc_info:  Descriptor information structure.
 * @direction:  to or from device
 *
 * This local routine frees buffers used in the DMA buffers.
 */
static void ksz_free_buffers(struct dev_info *adapter,
        struct ksz_desc_info *desc_info, int direction)
{
        int i;
        struct ksz_dma_buf *dma_buf;
        struct ksz_desc *desc = desc_info->ring;

        for (i = 0; i < desc_info->alloc; i++) {
                dma_buf = DMA_BUFFER(desc);
                if (dma_buf->skb)
                        free_dma_buf(adapter, dma_buf, direction);
                desc++;
        }
}

/**
 * ksz_free_mem - free all resources used by descriptors
 * @adapter:    Adapter information structure.
 *
 * This local routine frees all the resources allocated by ksz_alloc_mem().
 */
static void ksz_free_mem(struct dev_info *adapter)
{
        /* Free transmit buffers. */
        ksz_free_buffers(adapter, &adapter->hw.tx_desc_info, DMA_TO_DEVICE);

        /* Free receive buffers. */
        ksz_free_buffers(adapter, &adapter->hw.rx_desc_info, DMA_FROM_DEVICE);

        /* Free descriptors. */
        ksz_free_desc(adapter);
}

static void get_mib_counters(struct ksz_hw *hw, int first, int cnt,
        u64 *counter)
{
        int i;
        int mib;
        int port;
        struct ksz_port_mib *port_mib;

        memset(counter, 0, sizeof(u64) * TOTAL_PORT_COUNTER_NUM);
        for (i = 0, port = first; i < cnt; i++, port++) {
                port_mib = &hw->port_mib[port];
                for (mib = port_mib->mib_start; mib < hw->mib_cnt; mib++)
                        counter[mib] += port_mib->counter[mib];
        }
}

/**
 * send_packet - send packet
 * @skb:        Socket buffer.
 * @dev:        Network device.
 *
 * This routine is used to send a packet out to the network.
 */
static void send_packet(struct sk_buff *skb, struct net_device *dev)
{
        struct ksz_desc *desc;
        struct ksz_desc *first;
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;
        struct ksz_desc_info *info = &hw->tx_desc_info;
        struct ksz_dma_buf *dma_buf;
        int len;
        int last_frag = skb_shinfo(skb)->nr_frags;

        /*
         * KSZ8842 with multiple device interfaces needs to be told which port
         * to send.
         */
        if (hw->dev_count > 1)
                hw->dst_ports = 1 << priv->port.first_port;

        /* Hardware will pad the length to 60. */
        len = skb->len;

        /* Remember the very first descriptor. */
        first = info->cur;
        desc = first;

        dma_buf = DMA_BUFFER(desc);
        if (last_frag) {
                int frag;
                skb_frag_t *this_frag;

                dma_buf->len = skb_headlen(skb);

                dma_buf->dma = dma_map_single(&hw_priv->pdev->dev, skb->data,
                                              dma_buf->len, DMA_TO_DEVICE);
                set_tx_buf(desc, dma_buf->dma);
                set_tx_len(desc, dma_buf->len);

                frag = 0;
                do {
                        this_frag = &skb_shinfo(skb)->frags[frag];

                        /* Get a new descriptor. */
                        get_tx_pkt(info, &desc);

                        /* Keep track of descriptors used so far. */
                        ++hw->tx_int_cnt;

                        dma_buf = DMA_BUFFER(desc);
                        dma_buf->len = skb_frag_size(this_frag);

                        dma_buf->dma = dma_map_single(&hw_priv->pdev->dev,
                                                      skb_frag_address(this_frag),
                                                      dma_buf->len,
                                                      DMA_TO_DEVICE);
                        set_tx_buf(desc, dma_buf->dma);
                        set_tx_len(desc, dma_buf->len);

                        frag++;
                        if (frag == last_frag)
                                break;

                        /* Do not release the last descriptor here. */
                        release_desc(desc);
                } while (1);

                /* current points to the last descriptor. */
                info->cur = desc;

                /* Release the first descriptor. */
                release_desc(first);
        } else {
                dma_buf->len = len;

                dma_buf->dma = dma_map_single(&hw_priv->pdev->dev, skb->data,
                                              dma_buf->len, DMA_TO_DEVICE);
                set_tx_buf(desc, dma_buf->dma);
                set_tx_len(desc, dma_buf->len);
        }

        if (skb->ip_summed == CHECKSUM_PARTIAL) {
                (desc)->sw.buf.tx.csum_gen_tcp = 1;
                (desc)->sw.buf.tx.csum_gen_udp = 1;
        }

        /*
         * The last descriptor holds the packet so that it can be returned to
         * network subsystem after all descriptors are transmitted.
         */
        dma_buf->skb = skb;

        hw_send_pkt(hw);

        /* Update transmit statistics. */
        dev->stats.tx_packets++;
        dev->stats.tx_bytes += len;
}

/**
 * transmit_cleanup - clean up transmit descriptors
 * @hw_priv:    Network device.
 * @normal:     break if owned
 *
 * This routine is called to clean up the transmitted buffers.
 */
static void transmit_cleanup(struct dev_info *hw_priv, int normal)
{
        int last;
        union desc_stat status;
        struct ksz_hw *hw = &hw_priv->hw;
        struct ksz_desc_info *info = &hw->tx_desc_info;
        struct ksz_desc *desc;
        struct ksz_dma_buf *dma_buf;
        struct net_device *dev = NULL;

        spin_lock_irq(&hw_priv->hwlock);
        last = info->last;

        while (info->avail < info->alloc) {
                /* Get next descriptor which is not hardware owned. */
                desc = &info->ring[last];
                status.data = le32_to_cpu(desc->phw->ctrl.data);
                if (status.tx.hw_owned) {
                        if (normal)
                                break;
                        else
                                reset_desc(desc, status);
                }

                dma_buf = DMA_BUFFER(desc);
                dma_unmap_single(&hw_priv->pdev->dev, dma_buf->dma,
                                 dma_buf->len, DMA_TO_DEVICE);

                /* This descriptor contains the last buffer in the packet. */
                if (dma_buf->skb) {
                        dev = dma_buf->skb->dev;

                        /* Release the packet back to network subsystem. */
                        dev_kfree_skb_irq(dma_buf->skb);
                        dma_buf->skb = NULL;
                }

                /* Free the transmitted descriptor. */
                last++;
                last &= info->mask;
                info->avail++;
        }
        info->last = last;
        spin_unlock_irq(&hw_priv->hwlock);

        /* Notify the network subsystem that the packet has been sent. */
        if (dev)
                netif_trans_update(dev);
}

/**
 * tx_done - transmit done processing
 * @hw_priv:    Network device.
 *
 * This routine is called when the transmit interrupt is triggered, indicating
 * either a packet is sent successfully or there are transmit errors.
 */
static void tx_done(struct dev_info *hw_priv)
{
        struct ksz_hw *hw = &hw_priv->hw;
        int port;

        transmit_cleanup(hw_priv, 1);

        for (port = 0; port < hw->dev_count; port++) {
                struct net_device *dev = hw->port_info[port].pdev;

                if (netif_running(dev) && netif_queue_stopped(dev))
                        netif_wake_queue(dev);
        }
}

static inline void copy_old_skb(struct sk_buff *old, struct sk_buff *skb)
{
        skb->dev = old->dev;
        skb->protocol = old->protocol;
        skb->ip_summed = old->ip_summed;
        skb->csum = old->csum;
        skb_set_network_header(skb, ETH_HLEN);

        dev_consume_skb_any(old);
}

/**
 * netdev_tx - send out packet
 * @skb:        Socket buffer.
 * @dev:        Network device.
 *
 * This function is used by the upper network layer to send out a packet.
 *
 * Return 0 if successful; otherwise an error code indicating failure.
 */
static netdev_tx_t netdev_tx(struct sk_buff *skb, struct net_device *dev)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;
        int left;
        int num = 1;
        int rc = 0;

        if (hw->features & SMALL_PACKET_TX_BUG) {
                struct sk_buff *org_skb = skb;

                if (skb->len <= 48) {
                        if (skb_end_pointer(skb) - skb->data >= 50) {
                                memset(&skb->data[skb->len], 0, 50 - skb->len);
                                skb->len = 50;
                        } else {
                                skb = netdev_alloc_skb(dev, 50);
                                if (!skb)
                                        return NETDEV_TX_BUSY;
                                memcpy(skb->data, org_skb->data, org_skb->len);
                                memset(&skb->data[org_skb->len], 0,
                                        50 - org_skb->len);
                                skb->len = 50;
                                copy_old_skb(org_skb, skb);
                        }
                }
        }

        spin_lock_irq(&hw_priv->hwlock);

        num = skb_shinfo(skb)->nr_frags + 1;
        left = hw_alloc_pkt(hw, skb->len, num);
        if (left) {
                if (left < num ||
                    (CHECKSUM_PARTIAL == skb->ip_summed &&
                     skb->protocol == htons(ETH_P_IPV6))) {
                        struct sk_buff *org_skb = skb;

                        skb = netdev_alloc_skb(dev, org_skb->len);
                        if (!skb) {
                                rc = NETDEV_TX_BUSY;
                                goto unlock;
                        }
                        skb_copy_and_csum_dev(org_skb, skb->data);
                        org_skb->ip_summed = CHECKSUM_NONE;
                        skb->len = org_skb->len;
                        copy_old_skb(org_skb, skb);
                }
                send_packet(skb, dev);
                if (left <= num)
                        netif_stop_queue(dev);
        } else {
                /* Stop the transmit queue until packet is allocated. */
                netif_stop_queue(dev);
                rc = NETDEV_TX_BUSY;
        }
unlock:
        spin_unlock_irq(&hw_priv->hwlock);

        return rc;
}

/**
 * netdev_tx_timeout - transmit timeout processing
 * @dev:        Network device.
 * @txqueue:    index of hanging queue
 *
 * This routine is called when the transmit timer expires.  That indicates the
 * hardware is not running correctly because transmit interrupts are not
 * triggered to free up resources so that the transmit routine can continue
 * sending out packets.  The hardware is reset to correct the problem.
 */
static void netdev_tx_timeout(struct net_device *dev, unsigned int txqueue)
{
        static unsigned long last_reset;

        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;
        int port;

        if (hw->dev_count > 1) {
                /*
                 * Only reset the hardware if time between calls is long
                 * enough.
                 */
                if (time_before_eq(jiffies, last_reset + dev->watchdog_timeo))
                        hw_priv = NULL;
        }

        last_reset = jiffies;
        if (hw_priv) {
                hw_dis_intr(hw);
                hw_disable(hw);

                transmit_cleanup(hw_priv, 0);
                hw_reset_pkts(&hw->rx_desc_info);
                hw_reset_pkts(&hw->tx_desc_info);
                ksz_init_rx_buffers(hw_priv);

                hw_reset(hw);

                hw_set_desc_base(hw,
                        hw->tx_desc_info.ring_phys,
                        hw->rx_desc_info.ring_phys);
                hw_set_addr(hw);
                if (hw->all_multi)
                        hw_set_multicast(hw, hw->all_multi);
                else if (hw->multi_list_size)
                        hw_set_grp_addr(hw);

                if (hw->dev_count > 1) {
                        hw_set_add_addr(hw);
                        for (port = 0; port < SWITCH_PORT_NUM; port++) {
                                struct net_device *port_dev;

                                port_set_stp_state(hw, port,
                                        STP_STATE_DISABLED);

                                port_dev = hw->port_info[port].pdev;
                                if (netif_running(port_dev))
                                        port_set_stp_state(hw, port,
                                                STP_STATE_SIMPLE);
                        }
                }

                hw_enable(hw);
                hw_ena_intr(hw);
        }

        netif_trans_update(dev);
        netif_wake_queue(dev);
}

static inline void csum_verified(struct sk_buff *skb)
{
        unsigned short protocol;
        struct iphdr *iph;

        protocol = skb->protocol;
        skb_reset_network_header(skb);
        iph = (struct iphdr *) skb_network_header(skb);
        if (protocol == htons(ETH_P_8021Q)) {
                protocol = iph->tot_len;
                skb_set_network_header(skb, VLAN_HLEN);
                iph = (struct iphdr *) skb_network_header(skb);
        }
        if (protocol == htons(ETH_P_IP)) {
                if (iph->protocol == IPPROTO_TCP)
                        skb->ip_summed = CHECKSUM_UNNECESSARY;
        }
}

static inline int rx_proc(struct net_device *dev, struct ksz_hw* hw,
        struct ksz_desc *desc, union desc_stat status)
{
        int packet_len;
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_dma_buf *dma_buf;
        struct sk_buff *skb;

        /* Received length includes 4-byte CRC. */
        packet_len = status.rx.frame_len - 4;

        dma_buf = DMA_BUFFER(desc);
        dma_sync_single_for_cpu(&hw_priv->pdev->dev, dma_buf->dma,
                                packet_len + 4, DMA_FROM_DEVICE);

        do {
                /* skb->data != skb->head */
                skb = netdev_alloc_skb(dev, packet_len + 2);
                if (!skb) {
                        dev->stats.rx_dropped++;
                        return -ENOMEM;
                }

                /*
                 * Align socket buffer in 4-byte boundary for better
                 * performance.
                 */
                skb_reserve(skb, 2);

                skb_put_data(skb, dma_buf->skb->data, packet_len);
        } while (0);

        skb->protocol = eth_type_trans(skb, dev);

        if (hw->rx_cfg & (DMA_RX_CSUM_UDP | DMA_RX_CSUM_TCP))
                csum_verified(skb);

        /* Update receive statistics. */
        dev->stats.rx_packets++;
        dev->stats.rx_bytes += packet_len;

        /* Notify upper layer for received packet. */
        netif_rx(skb);

        return 0;
}

static int dev_rcv_packets(struct dev_info *hw_priv)
{
        int next;
        union desc_stat status;
        struct ksz_hw *hw = &hw_priv->hw;
        struct net_device *dev = hw->port_info[0].pdev;
        struct ksz_desc_info *info = &hw->rx_desc_info;
        int left = info->alloc;
        struct ksz_desc *desc;
        int received = 0;

        next = info->next;
        while (left--) {
                /* Get next descriptor which is not hardware owned. */
                desc = &info->ring[next];
                status.data = le32_to_cpu(desc->phw->ctrl.data);
                if (status.rx.hw_owned)
                        break;

                /* Status valid only when last descriptor bit is set. */
                if (status.rx.last_desc && status.rx.first_desc) {
                        if (rx_proc(dev, hw, desc, status))
                                goto release_packet;
                        received++;
                }

release_packet:
                release_desc(desc);
                next++;
                next &= info->mask;
        }
        info->next = next;

        return received;
}

static int port_rcv_packets(struct dev_info *hw_priv)
{
        int next;
        union desc_stat status;
        struct ksz_hw *hw = &hw_priv->hw;
        struct net_device *dev = hw->port_info[0].pdev;
        struct ksz_desc_info *info = &hw->rx_desc_info;
        int left = info->alloc;
        struct ksz_desc *desc;
        int received = 0;

        next = info->next;
        while (left--) {
                /* Get next descriptor which is not hardware owned. */
                desc = &info->ring[next];
                status.data = le32_to_cpu(desc->phw->ctrl.data);
                if (status.rx.hw_owned)
                        break;

                if (hw->dev_count > 1) {
                        /* Get received port number. */
                        int p = HW_TO_DEV_PORT(status.rx.src_port);

                        dev = hw->port_info[p].pdev;
                        if (!netif_running(dev))
                                goto release_packet;
                }

                /* Status valid only when last descriptor bit is set. */
                if (status.rx.last_desc && status.rx.first_desc) {
                        if (rx_proc(dev, hw, desc, status))
                                goto release_packet;
                        received++;
                }

release_packet:
                release_desc(desc);
                next++;
                next &= info->mask;
        }
        info->next = next;

        return received;
}

static int dev_rcv_special(struct dev_info *hw_priv)
{
        int next;
        union desc_stat status;
        struct ksz_hw *hw = &hw_priv->hw;
        struct net_device *dev = hw->port_info[0].pdev;
        struct ksz_desc_info *info = &hw->rx_desc_info;
        int left = info->alloc;
        struct ksz_desc *desc;
        int received = 0;

        next = info->next;
        while (left--) {
                /* Get next descriptor which is not hardware owned. */
                desc = &info->ring[next];
                status.data = le32_to_cpu(desc->phw->ctrl.data);
                if (status.rx.hw_owned)
                        break;

                if (hw->dev_count > 1) {
                        /* Get received port number. */
                        int p = HW_TO_DEV_PORT(status.rx.src_port);

                        dev = hw->port_info[p].pdev;
                        if (!netif_running(dev))
                                goto release_packet;
                }

                /* Status valid only when last descriptor bit is set. */
                if (status.rx.last_desc && status.rx.first_desc) {
                        /*
                         * Receive without error.  With receive errors
                         * disabled, packets with receive errors will be
                         * dropped, so no need to check the error bit.
                         */
                        if (!status.rx.error || (status.data &
                                        KS_DESC_RX_ERROR_COND) ==
                                        KS_DESC_RX_ERROR_TOO_LONG) {
                                if (rx_proc(dev, hw, desc, status))
                                        goto release_packet;
                                received++;
                        } else {
                                struct dev_priv *priv = netdev_priv(dev);

                                /* Update receive error statistics. */
                                priv->port.counter[OID_COUNTER_RCV_ERROR]++;
                        }
                }

release_packet:
                release_desc(desc);
                next++;
                next &= info->mask;
        }
        info->next = next;

        return received;
}

static void rx_proc_task(struct tasklet_struct *t)
{
        struct dev_info *hw_priv = from_tasklet(hw_priv, t, rx_tasklet);
        struct ksz_hw *hw = &hw_priv->hw;

        if (!hw->enabled)
                return;
        if (unlikely(!hw_priv->dev_rcv(hw_priv))) {

                /* In case receive process is suspended because of overrun. */
                hw_resume_rx(hw);

                /* tasklets are interruptible. */
                spin_lock_irq(&hw_priv->hwlock);
                hw_turn_on_intr(hw, KS884X_INT_RX_MASK);
                spin_unlock_irq(&hw_priv->hwlock);
        } else {
                hw_ack_intr(hw, KS884X_INT_RX);
                tasklet_schedule(&hw_priv->rx_tasklet);
        }
}

static void tx_proc_task(struct tasklet_struct *t)
{
        struct dev_info *hw_priv = from_tasklet(hw_priv, t, tx_tasklet);
        struct ksz_hw *hw = &hw_priv->hw;

        hw_ack_intr(hw, KS884X_INT_TX_MASK);

        tx_done(hw_priv);

        /* tasklets are interruptible. */
        spin_lock_irq(&hw_priv->hwlock);
        hw_turn_on_intr(hw, KS884X_INT_TX);
        spin_unlock_irq(&hw_priv->hwlock);
}

static inline void handle_rx_stop(struct ksz_hw *hw)
{
        /* Receive just has been stopped. */
        if (0 == hw->rx_stop)
                hw->intr_mask &= ~KS884X_INT_RX_STOPPED;
        else if (hw->rx_stop > 1) {
                if (hw->enabled && (hw->rx_cfg & DMA_RX_ENABLE)) {
                        hw_start_rx(hw);
                } else {
                        hw->intr_mask &= ~KS884X_INT_RX_STOPPED;
                        hw->rx_stop = 0;
                }
        } else
                /* Receive just has been started. */
                hw->rx_stop++;
}

/**
 * netdev_intr - interrupt handling
 * @irq:        Interrupt number.
 * @dev_id:     Network device.
 *
 * This function is called by upper network layer to signal interrupt.
 *
 * Return IRQ_HANDLED if interrupt is handled.
 */
static irqreturn_t netdev_intr(int irq, void *dev_id)
{
        uint int_enable = 0;
        struct net_device *dev = (struct net_device *) dev_id;
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;

        spin_lock(&hw_priv->hwlock);

        hw_read_intr(hw, &int_enable);

        /* Not our interrupt! */
        if (!int_enable) {
                spin_unlock(&hw_priv->hwlock);
                return IRQ_NONE;
        }

        do {
                hw_ack_intr(hw, int_enable);
                int_enable &= hw->intr_mask;

                if (unlikely(int_enable & KS884X_INT_TX_MASK)) {
                        hw_dis_intr_bit(hw, KS884X_INT_TX_MASK);
                        tasklet_schedule(&hw_priv->tx_tasklet);
                }

                if (likely(int_enable & KS884X_INT_RX)) {
                        hw_dis_intr_bit(hw, KS884X_INT_RX);
                        tasklet_schedule(&hw_priv->rx_tasklet);
                }

                if (unlikely(int_enable & KS884X_INT_RX_OVERRUN)) {
                        dev->stats.rx_fifo_errors++;
                        hw_resume_rx(hw);
                }

                if (unlikely(int_enable & KS884X_INT_PHY)) {
                        struct ksz_port *port = &priv->port;

                        hw->features |= LINK_INT_WORKING;
                        port_get_link_speed(port);
                }

                if (unlikely(int_enable & KS884X_INT_RX_STOPPED)) {
                        handle_rx_stop(hw);
                        break;
                }

                if (unlikely(int_enable & KS884X_INT_TX_STOPPED)) {
                        u32 data;

                        hw->intr_mask &= ~KS884X_INT_TX_STOPPED;
                        pr_info("Tx stopped\n");
                        data = readl(hw->io + KS_DMA_TX_CTRL);
                        if (!(data & DMA_TX_ENABLE))
                                pr_info("Tx disabled\n");
                        break;
                }
        } while (0);

        hw_ena_intr(hw);

        spin_unlock(&hw_priv->hwlock);

        return IRQ_HANDLED;
}

/*
 * Linux network device functions
 */

static unsigned long next_jiffies;

#ifdef CONFIG_NET_POLL_CONTROLLER
static void netdev_netpoll(struct net_device *dev)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;

        hw_dis_intr(&hw_priv->hw);
        netdev_intr(dev->irq, dev);
}
#endif

static void bridge_change(struct ksz_hw *hw)
{
        int port;
        u8  member;
        struct ksz_switch *sw = hw->ksz_switch;

        /* No ports in forwarding state. */
        if (!sw->member) {
                port_set_stp_state(hw, SWITCH_PORT_NUM, STP_STATE_SIMPLE);
                sw_block_addr(hw);
        }
        for (port = 0; port < SWITCH_PORT_NUM; port++) {
                if (STP_STATE_FORWARDING == sw->port_cfg[port].stp_state)
                        member = HOST_MASK | sw->member;
                else
                        member = HOST_MASK | (1 << port);
                if (member != sw->port_cfg[port].member)
                        sw_cfg_port_base_vlan(hw, port, member);
        }
}

/**
 * netdev_close - close network device
 * @dev:        Network device.
 *
 * This function process the close operation of network device.  This is caused
 * by the user command "ifconfig ethX down."
 *
 * Return 0 if successful; otherwise an error code indicating failure.
 */
static int netdev_close(struct net_device *dev)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_port *port = &priv->port;
        struct ksz_hw *hw = &hw_priv->hw;
        int pi;

        netif_stop_queue(dev);

        ksz_stop_timer(&priv->monitor_timer_info);

        /* Need to shut the port manually in multiple device interfaces mode. */
        if (hw->dev_count > 1) {
                port_set_stp_state(hw, port->first_port, STP_STATE_DISABLED);

                /* Port is closed.  Need to change bridge setting. */
                if (hw->features & STP_SUPPORT) {
                        pi = 1 << port->first_port;
                        if (hw->ksz_switch->member & pi) {
                                hw->ksz_switch->member &= ~pi;
                                bridge_change(hw);
                        }
                }
        }
        if (port->first_port > 0)
                hw_del_addr(hw, dev->dev_addr);
        if (!hw_priv->wol_enable)
                port_set_power_saving(port, true);

        if (priv->multicast)
                --hw->all_multi;
        if (priv->promiscuous)
                --hw->promiscuous;

        hw_priv->opened--;
        if (!(hw_priv->opened)) {
                ksz_stop_timer(&hw_priv->mib_timer_info);
                flush_work(&hw_priv->mib_read);

                hw_dis_intr(hw);
                hw_disable(hw);
                hw_clr_multicast(hw);

                /* Delay for receive task to stop scheduling itself. */
                msleep(2000 / HZ);

                tasklet_kill(&hw_priv->rx_tasklet);
                tasklet_kill(&hw_priv->tx_tasklet);
                free_irq(dev->irq, hw_priv->dev);

                transmit_cleanup(hw_priv, 0);
                hw_reset_pkts(&hw->rx_desc_info);
                hw_reset_pkts(&hw->tx_desc_info);

                /* Clean out static MAC table when the switch is shutdown. */
                if (hw->features & STP_SUPPORT)
                        sw_clr_sta_mac_table(hw);
        }

        return 0;
}

static void hw_cfg_huge_frame(struct dev_info *hw_priv, struct ksz_hw *hw)
{
        if (hw->ksz_switch) {
                u32 data;

                data = readw(hw->io + KS8842_SWITCH_CTRL_2_OFFSET);
                if (hw->features & RX_HUGE_FRAME)
                        data |= SWITCH_HUGE_PACKET;
                else
                        data &= ~SWITCH_HUGE_PACKET;
                writew(data, hw->io + KS8842_SWITCH_CTRL_2_OFFSET);
        }
        if (hw->features & RX_HUGE_FRAME) {
                hw->rx_cfg |= DMA_RX_ERROR;
                hw_priv->dev_rcv = dev_rcv_special;
        } else {
                hw->rx_cfg &= ~DMA_RX_ERROR;
                if (hw->dev_count > 1)
                        hw_priv->dev_rcv = port_rcv_packets;
                else
                        hw_priv->dev_rcv = dev_rcv_packets;
        }
}

static int prepare_hardware(struct net_device *dev)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;
        int rc = 0;

        /* Remember the network device that requests interrupts. */
        hw_priv->dev = dev;
        rc = request_irq(dev->irq, netdev_intr, IRQF_SHARED, dev->name, dev);
        if (rc)
                return rc;
        tasklet_setup(&hw_priv->rx_tasklet, rx_proc_task);
        tasklet_setup(&hw_priv->tx_tasklet, tx_proc_task);

        hw->promiscuous = 0;
        hw->all_multi = 0;
        hw->multi_list_size = 0;

        hw_reset(hw);

        hw_set_desc_base(hw,
                hw->tx_desc_info.ring_phys, hw->rx_desc_info.ring_phys);
        hw_set_addr(hw);
        hw_cfg_huge_frame(hw_priv, hw);
        ksz_init_rx_buffers(hw_priv);
        return 0;
}

static void set_media_state(struct net_device *dev, int media_state)
{
        struct dev_priv *priv = netdev_priv(dev);

        if (media_state == priv->media_state)
                netif_carrier_on(dev);
        else
                netif_carrier_off(dev);
        netif_info(priv, link, dev, "link %s\n",
                   media_state == priv->media_state ? "on" : "off");
}

/**
 * netdev_open - open network device
 * @dev:        Network device.
 *
 * This function process the open operation of network device.  This is caused
 * by the user command "ifconfig ethX up."
 *
 * Return 0 if successful; otherwise an error code indicating failure.
 */
static int netdev_open(struct net_device *dev)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;
        struct ksz_port *port = &priv->port;
        int i;
        int p;
        int rc = 0;

        priv->multicast = 0;
        priv->promiscuous = 0;

        /* Reset device statistics. */
        memset(&dev->stats, 0, sizeof(struct net_device_stats));
        memset((void *) port->counter, 0,
                (sizeof(u64) * OID_COUNTER_LAST));

        if (!(hw_priv->opened)) {
                rc = prepare_hardware(dev);
                if (rc)
                        return rc;
                for (i = 0; i < hw->mib_port_cnt; i++) {
                        if (next_jiffies < jiffies)
                                next_jiffies = jiffies + HZ * 2;
                        else
                                next_jiffies += HZ * 1;
                        hw_priv->counter[i].time = next_jiffies;
                        hw->port_mib[i].state = media_disconnected;
                        port_init_cnt(hw, i);
                }
                if (hw->ksz_switch)
                        hw->port_mib[HOST_PORT].state = media_connected;
                else {
                        hw_add_wol_bcast(hw);
                        hw_cfg_wol_pme(hw, 0);
                        hw_clr_wol_pme_status(&hw_priv->hw);
                }
        }
        port_set_power_saving(port, false);

        for (i = 0, p = port->first_port; i < port->port_cnt; i++, p++) {
                /*
                 * Initialize to invalid value so that link detection
                 * is done.
                 */
                hw->port_info[p].partner = 0xFF;
                hw->port_info[p].state = media_disconnected;
        }

        /* Need to open the port in multiple device interfaces mode. */
        if (hw->dev_count > 1) {
                port_set_stp_state(hw, port->first_port, STP_STATE_SIMPLE);
                if (port->first_port > 0)
                        hw_add_addr(hw, dev->dev_addr);
        }

        port_get_link_speed(port);
        if (port->force_link)
                port_force_link_speed(port);
        else
                port_set_link_speed(port);

        if (!(hw_priv->opened)) {
                hw_setup_intr(hw);
                hw_enable(hw);
                hw_ena_intr(hw);

                if (hw->mib_port_cnt)
                        ksz_start_timer(&hw_priv->mib_timer_info,
                                hw_priv->mib_timer_info.period);
        }

        hw_priv->opened++;

        ksz_start_timer(&priv->monitor_timer_info,
                priv->monitor_timer_info.period);

        priv->media_state = port->linked->state;

        set_media_state(dev, media_connected);
        netif_start_queue(dev);

        return 0;
}

/* RX errors = rx_errors */
/* RX dropped = rx_dropped */
/* RX overruns = rx_fifo_errors */
/* RX frame = rx_crc_errors + rx_frame_errors + rx_length_errors */
/* TX errors = tx_errors */
/* TX dropped = tx_dropped */
/* TX overruns = tx_fifo_errors */
/* TX carrier = tx_aborted_errors + tx_carrier_errors + tx_window_errors */
/* collisions = collisions */

/**
 * netdev_query_statistics - query network device statistics
 * @dev:        Network device.
 *
 * This function returns the statistics of the network device.  The device
 * needs not be opened.
 *
 * Return network device statistics.
 */
static struct net_device_stats *netdev_query_statistics(struct net_device *dev)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct ksz_port *port = &priv->port;
        struct ksz_hw *hw = &priv->adapter->hw;
        struct ksz_port_mib *mib;
        int i;
        int p;

        dev->stats.rx_errors = port->counter[OID_COUNTER_RCV_ERROR];
        dev->stats.tx_errors = port->counter[OID_COUNTER_XMIT_ERROR];

        /* Reset to zero to add count later. */
        dev->stats.multicast = 0;
        dev->stats.collisions = 0;
        dev->stats.rx_length_errors = 0;
        dev->stats.rx_crc_errors = 0;
        dev->stats.rx_frame_errors = 0;
        dev->stats.tx_window_errors = 0;

        for (i = 0, p = port->first_port; i < port->mib_port_cnt; i++, p++) {
                mib = &hw->port_mib[p];

                dev->stats.multicast += (unsigned long)
                        mib->counter[MIB_COUNTER_RX_MULTICAST];

                dev->stats.collisions += (unsigned long)
                        mib->counter[MIB_COUNTER_TX_TOTAL_COLLISION];

                dev->stats.rx_length_errors += (unsigned long)(
                        mib->counter[MIB_COUNTER_RX_UNDERSIZE] +
                        mib->counter[MIB_COUNTER_RX_FRAGMENT] +
                        mib->counter[MIB_COUNTER_RX_OVERSIZE] +
                        mib->counter[MIB_COUNTER_RX_JABBER]);
                dev->stats.rx_crc_errors += (unsigned long)
                        mib->counter[MIB_COUNTER_RX_CRC_ERR];
                dev->stats.rx_frame_errors += (unsigned long)(
                        mib->counter[MIB_COUNTER_RX_ALIGNMENT_ERR] +
                        mib->counter[MIB_COUNTER_RX_SYMBOL_ERR]);

                dev->stats.tx_window_errors += (unsigned long)
                        mib->counter[MIB_COUNTER_TX_LATE_COLLISION];
        }

        return &dev->stats;
}

/**
 * netdev_set_mac_address - set network device MAC address
 * @dev:        Network device.
 * @addr:       Buffer of MAC address.
 *
 * This function is used to set the MAC address of the network device.
 *
 * Return 0 to indicate success.
 */
static int netdev_set_mac_address(struct net_device *dev, void *addr)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;
        struct sockaddr *mac = addr;
        uint interrupt;

        if (priv->port.first_port > 0)
                hw_del_addr(hw, dev->dev_addr);
        else {
                hw->mac_override = 1;
                memcpy(hw->override_addr, mac->sa_data, ETH_ALEN);
        }

        memcpy(dev->dev_addr, mac->sa_data, ETH_ALEN);

        interrupt = hw_block_intr(hw);

        if (priv->port.first_port > 0)
                hw_add_addr(hw, dev->dev_addr);
        else
                hw_set_addr(hw);
        hw_restore_intr(hw, interrupt);

        return 0;
}

static void dev_set_promiscuous(struct net_device *dev, struct dev_priv *priv,
        struct ksz_hw *hw, int promiscuous)
{
        if (promiscuous != priv->promiscuous) {
                u8 prev_state = hw->promiscuous;

                if (promiscuous)
                        ++hw->promiscuous;
                else
                        --hw->promiscuous;
                priv->promiscuous = promiscuous;

                /* Turn on/off promiscuous mode. */
                if (hw->promiscuous <= 1 && prev_state <= 1)
                        hw_set_promiscuous(hw, hw->promiscuous);

                /*
                 * Port is not in promiscuous mode, meaning it is released
                 * from the bridge.
                 */
                if ((hw->features & STP_SUPPORT) && !promiscuous &&
                    netif_is_bridge_port(dev)) {
                        struct ksz_switch *sw = hw->ksz_switch;
                        int port = priv->port.first_port;

                        port_set_stp_state(hw, port, STP_STATE_DISABLED);
                        port = 1 << port;
                        if (sw->member & port) {
                                sw->member &= ~port;
                                bridge_change(hw);
                        }
                }
        }
}

static void dev_set_multicast(struct dev_priv *priv, struct ksz_hw *hw,
        int multicast)
{
        if (multicast != priv->multicast) {
                u8 all_multi = hw->all_multi;

                if (multicast)
                        ++hw->all_multi;
                else
                        --hw->all_multi;
                priv->multicast = multicast;

                /* Turn on/off all multicast mode. */
                if (hw->all_multi <= 1 && all_multi <= 1)
                        hw_set_multicast(hw, hw->all_multi);
        }
}

/**
 * netdev_set_rx_mode
 * @dev:        Network device.
 *
 * This routine is used to set multicast addresses or put the network device
 * into promiscuous mode.
 */
static void netdev_set_rx_mode(struct net_device *dev)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;
        struct netdev_hw_addr *ha;
        int multicast = (dev->flags & IFF_ALLMULTI);

        dev_set_promiscuous(dev, priv, hw, (dev->flags & IFF_PROMISC));

        if (hw_priv->hw.dev_count > 1)
                multicast |= (dev->flags & IFF_MULTICAST);
        dev_set_multicast(priv, hw, multicast);

        /* Cannot use different hashes in multiple device interfaces mode. */
        if (hw_priv->hw.dev_count > 1)
                return;

        if ((dev->flags & IFF_MULTICAST) && !netdev_mc_empty(dev)) {
                int i = 0;

                /* List too big to support so turn on all multicast mode. */
                if (netdev_mc_count(dev) > MAX_MULTICAST_LIST) {
                        if (MAX_MULTICAST_LIST != hw->multi_list_size) {
                                hw->multi_list_size = MAX_MULTICAST_LIST;
                                ++hw->all_multi;
                                hw_set_multicast(hw, hw->all_multi);
                        }
                        return;
                }

                netdev_for_each_mc_addr(ha, dev) {
                        if (i >= MAX_MULTICAST_LIST)
                                break;
                        memcpy(hw->multi_list[i++], ha->addr, ETH_ALEN);
                }
                hw->multi_list_size = (u8) i;
                hw_set_grp_addr(hw);
        } else {
                if (MAX_MULTICAST_LIST == hw->multi_list_size) {
                        --hw->all_multi;
                        hw_set_multicast(hw, hw->all_multi);
                }
                hw->multi_list_size = 0;
                hw_clr_multicast(hw);
        }
}

static int netdev_change_mtu(struct net_device *dev, int new_mtu)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;
        int hw_mtu;

        if (netif_running(dev))
                return -EBUSY;

        /* Cannot use different MTU in multiple device interfaces mode. */
        if (hw->dev_count > 1)
                if (dev != hw_priv->dev)
                        return 0;

        hw_mtu = new_mtu + ETHERNET_HEADER_SIZE + 4;
        if (hw_mtu > REGULAR_RX_BUF_SIZE) {
                hw->features |= RX_HUGE_FRAME;
                hw_mtu = MAX_RX_BUF_SIZE;
        } else {
                hw->features &= ~RX_HUGE_FRAME;
                hw_mtu = REGULAR_RX_BUF_SIZE;
        }
        hw_mtu = (hw_mtu + 3) & ~3;
        hw_priv->mtu = hw_mtu;
        dev->mtu = new_mtu;

        return 0;
}

/**
 * netdev_ioctl - I/O control processing
 * @dev:        Network device.
 * @ifr:        Interface request structure.
 * @cmd:        I/O control code.
 *
 * This function is used to process I/O control calls.
 *
 * Return 0 to indicate success.
 */
static int netdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;
        struct ksz_port *port = &priv->port;
        int result = 0;
        struct mii_ioctl_data *data = if_mii(ifr);

        if (down_interruptible(&priv->proc_sem))
                return -ERESTARTSYS;

        switch (cmd) {
        /* Get address of MII PHY in use. */
        case SIOCGMIIPHY:
                data->phy_id = priv->id;
                fallthrough;

        /* Read MII PHY register. */
        case SIOCGMIIREG:
                if (data->phy_id != priv->id || data->reg_num >= 6)
                        result = -EIO;
                else
                        hw_r_phy(hw, port->linked->port_id, data->reg_num,
                                &data->val_out);
                break;

        /* Write MII PHY register. */
        case SIOCSMIIREG:
                if (!capable(CAP_NET_ADMIN))
                        result = -EPERM;
                else if (data->phy_id != priv->id || data->reg_num >= 6)
                        result = -EIO;
                else
                        hw_w_phy(hw, port->linked->port_id, data->reg_num,
                                data->val_in);
                break;

        default:
                result = -EOPNOTSUPP;
        }

        up(&priv->proc_sem);

        return result;
}

/*
 * MII support
 */

/**
 * mdio_read - read PHY register
 * @dev:        Network device.
 * @phy_id:     The PHY id.
 * @reg_num:    The register number.
 *
 * This function returns the PHY register value.
 *
 * Return the register value.
 */
static int mdio_read(struct net_device *dev, int phy_id, int reg_num)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct ksz_port *port = &priv->port;
        struct ksz_hw *hw = port->hw;
        u16 val_out;

        hw_r_phy(hw, port->linked->port_id, reg_num << 1, &val_out);
        return val_out;
}

/**
 * mdio_write - set PHY register
 * @dev:        Network device.
 * @phy_id:     The PHY id.
 * @reg_num:    The register number.
 * @val:        The register value.
 *
 * This procedure sets the PHY register value.
 */
static void mdio_write(struct net_device *dev, int phy_id, int reg_num, int val)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct ksz_port *port = &priv->port;
        struct ksz_hw *hw = port->hw;
        int i;
        int pi;

        for (i = 0, pi = port->first_port; i < port->port_cnt; i++, pi++)
                hw_w_phy(hw, pi, reg_num << 1, val);
}

/*
 * ethtool support
 */

#define EEPROM_SIZE                     0x40

static u16 eeprom_data[EEPROM_SIZE] = { 0 };

#define ADVERTISED_ALL                  \
        (ADVERTISED_10baseT_Half |      \
        ADVERTISED_10baseT_Full |       \
        ADVERTISED_100baseT_Half |      \
        ADVERTISED_100baseT_Full)

/* These functions use the MII functions in mii.c. */

/**
 * netdev_get_link_ksettings - get network device settings
 * @dev:        Network device.
 * @cmd:        Ethtool command.
 *
 * This function queries the PHY and returns its state in the ethtool command.
 *
 * Return 0 if successful; otherwise an error code.
 */
static int netdev_get_link_ksettings(struct net_device *dev,
                                     struct ethtool_link_ksettings *cmd)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;

        mutex_lock(&hw_priv->lock);
        mii_ethtool_get_link_ksettings(&priv->mii_if, cmd);
        ethtool_link_ksettings_add_link_mode(cmd, advertising, TP);
        mutex_unlock(&hw_priv->lock);

        /* Save advertised settings for workaround in next function. */
        ethtool_convert_link_mode_to_legacy_u32(&priv->advertising,
                                                cmd->link_modes.advertising);

        return 0;
}

/**
 * netdev_set_link_ksettings - set network device settings
 * @dev:        Network device.
 * @cmd:        Ethtool command.
 *
 * This function sets the PHY according to the ethtool command.
 *
 * Return 0 if successful; otherwise an error code.
 */
static int netdev_set_link_ksettings(struct net_device *dev,
                                     const struct ethtool_link_ksettings *cmd)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_port *port = &priv->port;
        struct ethtool_link_ksettings copy_cmd;
        u32 speed = cmd->base.speed;
        u32 advertising;
        int rc;

        ethtool_convert_link_mode_to_legacy_u32(&advertising,
                                                cmd->link_modes.advertising);

        /*
         * ethtool utility does not change advertised setting if auto
         * negotiation is not specified explicitly.
         */
        if (cmd->base.autoneg && priv->advertising == advertising) {
                advertising |= ADVERTISED_ALL;
                if (10 == speed)
                        advertising &=
                                ~(ADVERTISED_100baseT_Full |
                                ADVERTISED_100baseT_Half);
                else if (100 == speed)
                        advertising &=
                                ~(ADVERTISED_10baseT_Full |
                                ADVERTISED_10baseT_Half);
                if (0 == cmd->base.duplex)
                        advertising &=
                                ~(ADVERTISED_100baseT_Full |
                                ADVERTISED_10baseT_Full);
                else if (1 == cmd->base.duplex)
                        advertising &=
                                ~(ADVERTISED_100baseT_Half |
                                ADVERTISED_10baseT_Half);
        }
        mutex_lock(&hw_priv->lock);
        if (cmd->base.autoneg &&
            (advertising & ADVERTISED_ALL) == ADVERTISED_ALL) {
                port->duplex = 0;
                port->speed = 0;
                port->force_link = 0;
        } else {
                port->duplex = cmd->base.duplex + 1;
                if (1000 != speed)
                        port->speed = speed;
                if (cmd->base.autoneg)
                        port->force_link = 0;
                else
                        port->force_link = 1;
        }

        memcpy(&copy_cmd, cmd, sizeof(copy_cmd));
        ethtool_convert_legacy_u32_to_link_mode(copy_cmd.link_modes.advertising,
                                                advertising);
        rc = mii_ethtool_set_link_ksettings(
                &priv->mii_if,
                (const struct ethtool_link_ksettings *)&copy_cmd);
        mutex_unlock(&hw_priv->lock);
        return rc;
}

/**
 * netdev_nway_reset - restart auto-negotiation
 * @dev:        Network device.
 *
 * This function restarts the PHY for auto-negotiation.
 *
 * Return 0 if successful; otherwise an error code.
 */
static int netdev_nway_reset(struct net_device *dev)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        int rc;

        mutex_lock(&hw_priv->lock);
        rc = mii_nway_restart(&priv->mii_if);
        mutex_unlock(&hw_priv->lock);
        return rc;
}

/**
 * netdev_get_link - get network device link status
 * @dev:        Network device.
 *
 * This function gets the link status from the PHY.
 *
 * Return true if PHY is linked and false otherwise.
 */
static u32 netdev_get_link(struct net_device *dev)
{
        struct dev_priv *priv = netdev_priv(dev);
        int rc;

        rc = mii_link_ok(&priv->mii_if);
        return rc;
}

/**
 * netdev_get_drvinfo - get network driver information
 * @dev:        Network device.
 * @info:       Ethtool driver info data structure.
 *
 * This procedure returns the driver information.
 */
static void netdev_get_drvinfo(struct net_device *dev,
        struct ethtool_drvinfo *info)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;

        strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
        strlcpy(info->version, DRV_VERSION, sizeof(info->version));
        strlcpy(info->bus_info, pci_name(hw_priv->pdev),
                sizeof(info->bus_info));
}

static struct hw_regs {
        int start;
        int end;
} hw_regs_range[] = {
        { KS_DMA_TX_CTRL,       KS884X_INTERRUPTS_STATUS },
        { KS_ADD_ADDR_0_LO,     KS_ADD_ADDR_F_HI },
        { KS884X_ADDR_0_OFFSET, KS8841_WOL_FRAME_BYTE2_OFFSET },
        { KS884X_SIDER_P,       KS8842_SGCR7_P },
        { KS8842_MACAR1_P,      KS8842_TOSR8_P },
        { KS884X_P1MBCR_P,      KS8842_P3ERCR_P },
        { 0, 0 }
};

/**
 * netdev_get_regs_len - get length of register dump
 * @dev:        Network device.
 *
 * This function returns the length of the register dump.
 *
 * Return length of the register dump.
 */
static int netdev_get_regs_len(struct net_device *dev)
{
        struct hw_regs *range = hw_regs_range;
        int regs_len = 0x10 * sizeof(u32);

        while (range->end > range->start) {
                regs_len += (range->end - range->start + 3) / 4 * 4;
                range++;
        }
        return regs_len;
}

/**
 * netdev_get_regs - get register dump
 * @dev:        Network device.
 * @regs:       Ethtool registers data structure.
 * @ptr:        Buffer to store the register values.
 *
 * This procedure dumps the register values in the provided buffer.
 */
static void netdev_get_regs(struct net_device *dev, struct ethtool_regs *regs,
        void *ptr)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;
        int *buf = (int *) ptr;
        struct hw_regs *range = hw_regs_range;
        int len;

        mutex_lock(&hw_priv->lock);
        regs->version = 0;
        for (len = 0; len < 0x40; len += 4) {
                pci_read_config_dword(hw_priv->pdev, len, buf);
                buf++;
        }
        while (range->end > range->start) {
                for (len = range->start; len < range->end; len += 4) {
                        *buf = readl(hw->io + len);
                        buf++;
                }
                range++;
        }
        mutex_unlock(&hw_priv->lock);
}

#define WOL_SUPPORT                     \
        (WAKE_PHY | WAKE_MAGIC |        \
        WAKE_UCAST | WAKE_MCAST |       \
        WAKE_BCAST | WAKE_ARP)

/**
 * netdev_get_wol - get Wake-on-LAN support
 * @dev:        Network device.
 * @wol:        Ethtool Wake-on-LAN data structure.
 *
 * This procedure returns Wake-on-LAN support.
 */
static void netdev_get_wol(struct net_device *dev,
        struct ethtool_wolinfo *wol)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;

        wol->supported = hw_priv->wol_support;
        wol->wolopts = hw_priv->wol_enable;
        memset(&wol->sopass, 0, sizeof(wol->sopass));
}

/**
 * netdev_set_wol - set Wake-on-LAN support
 * @dev:        Network device.
 * @wol:        Ethtool Wake-on-LAN data structure.
 *
 * This function sets Wake-on-LAN support.
 *
 * Return 0 if successful; otherwise an error code.
 */
static int netdev_set_wol(struct net_device *dev,
        struct ethtool_wolinfo *wol)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;

        /* Need to find a way to retrieve the device IP address. */
        static const u8 net_addr[] = { 192, 168, 1, 1 };

        if (wol->wolopts & ~hw_priv->wol_support)
                return -EINVAL;

        hw_priv->wol_enable = wol->wolopts;

        /* Link wakeup cannot really be disabled. */
        if (wol->wolopts)
                hw_priv->wol_enable |= WAKE_PHY;
        hw_enable_wol(&hw_priv->hw, hw_priv->wol_enable, net_addr);
        return 0;
}

/**
 * netdev_get_msglevel - get debug message level
 * @dev:        Network device.
 *
 * This function returns current debug message level.
 *
 * Return current debug message flags.
 */
static u32 netdev_get_msglevel(struct net_device *dev)
{
        struct dev_priv *priv = netdev_priv(dev);

        return priv->msg_enable;
}

/**
 * netdev_set_msglevel - set debug message level
 * @dev:        Network device.
 * @value:      Debug message flags.
 *
 * This procedure sets debug message level.
 */
static void netdev_set_msglevel(struct net_device *dev, u32 value)
{
        struct dev_priv *priv = netdev_priv(dev);

        priv->msg_enable = value;
}

/**
 * netdev_get_eeprom_len - get EEPROM length
 * @dev:        Network device.
 *
 * This function returns the length of the EEPROM.
 *
 * Return length of the EEPROM.
 */
static int netdev_get_eeprom_len(struct net_device *dev)
{
        return EEPROM_SIZE * 2;
}

#define EEPROM_MAGIC                    0x10A18842

/**
 * netdev_get_eeprom - get EEPROM data
 * @dev:        Network device.
 * @eeprom:     Ethtool EEPROM data structure.
 * @data:       Buffer to store the EEPROM data.
 *
 * This function dumps the EEPROM data in the provided buffer.
 *
 * Return 0 if successful; otherwise an error code.
 */
static int netdev_get_eeprom(struct net_device *dev,
        struct ethtool_eeprom *eeprom, u8 *data)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        u8 *eeprom_byte = (u8 *) eeprom_data;
        int i;
        int len;

        len = (eeprom->offset + eeprom->len + 1) / 2;
        for (i = eeprom->offset / 2; i < len; i++)
                eeprom_data[i] = eeprom_read(&hw_priv->hw, i);
        eeprom->magic = EEPROM_MAGIC;
        memcpy(data, &eeprom_byte[eeprom->offset], eeprom->len);

        return 0;
}

/**
 * netdev_set_eeprom - write EEPROM data
 * @dev:        Network device.
 * @eeprom:     Ethtool EEPROM data structure.
 * @data:       Data buffer.
 *
 * This function modifies the EEPROM data one byte at a time.
 *
 * Return 0 if successful; otherwise an error code.
 */
static int netdev_set_eeprom(struct net_device *dev,
        struct ethtool_eeprom *eeprom, u8 *data)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        u16 eeprom_word[EEPROM_SIZE];
        u8 *eeprom_byte = (u8 *) eeprom_word;
        int i;
        int len;

        if (eeprom->magic != EEPROM_MAGIC)
                return -EINVAL;

        len = (eeprom->offset + eeprom->len + 1) / 2;
        for (i = eeprom->offset / 2; i < len; i++)
                eeprom_data[i] = eeprom_read(&hw_priv->hw, i);
        memcpy(eeprom_word, eeprom_data, EEPROM_SIZE * 2);
        memcpy(&eeprom_byte[eeprom->offset], data, eeprom->len);
        for (i = 0; i < EEPROM_SIZE; i++)
                if (eeprom_word[i] != eeprom_data[i]) {
                        eeprom_data[i] = eeprom_word[i];
                        eeprom_write(&hw_priv->hw, i, eeprom_data[i]);
        }

        return 0;
}

/**
 * netdev_get_pauseparam - get flow control parameters
 * @dev:        Network device.
 * @pause:      Ethtool PAUSE settings data structure.
 *
 * This procedure returns the PAUSE control flow settings.
 */
static void netdev_get_pauseparam(struct net_device *dev,
        struct ethtool_pauseparam *pause)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;

        pause->autoneg = (hw->overrides & PAUSE_FLOW_CTRL) ? 0 : 1;
        if (!hw->ksz_switch) {
                pause->rx_pause =
                        (hw->rx_cfg & DMA_RX_FLOW_ENABLE) ? 1 : 0;
                pause->tx_pause =
                        (hw->tx_cfg & DMA_TX_FLOW_ENABLE) ? 1 : 0;
        } else {
                pause->rx_pause =
                        (sw_chk(hw, KS8842_SWITCH_CTRL_1_OFFSET,
                                SWITCH_RX_FLOW_CTRL)) ? 1 : 0;
                pause->tx_pause =
                        (sw_chk(hw, KS8842_SWITCH_CTRL_1_OFFSET,
                                SWITCH_TX_FLOW_CTRL)) ? 1 : 0;
        }
}

/**
 * netdev_set_pauseparam - set flow control parameters
 * @dev:        Network device.
 * @pause:      Ethtool PAUSE settings data structure.
 *
 * This function sets the PAUSE control flow settings.
 * Not implemented yet.
 *
 * Return 0 if successful; otherwise an error code.
 */
static int netdev_set_pauseparam(struct net_device *dev,
        struct ethtool_pauseparam *pause)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;
        struct ksz_port *port = &priv->port;

        mutex_lock(&hw_priv->lock);
        if (pause->autoneg) {
                if (!pause->rx_pause && !pause->tx_pause)
                        port->flow_ctrl = PHY_NO_FLOW_CTRL;
                else
                        port->flow_ctrl = PHY_FLOW_CTRL;
                hw->overrides &= ~PAUSE_FLOW_CTRL;
                port->force_link = 0;
                if (hw->ksz_switch) {
                        sw_cfg(hw, KS8842_SWITCH_CTRL_1_OFFSET,
                                SWITCH_RX_FLOW_CTRL, 1);
                        sw_cfg(hw, KS8842_SWITCH_CTRL_1_OFFSET,
                                SWITCH_TX_FLOW_CTRL, 1);
                }
                port_set_link_speed(port);
        } else {
                hw->overrides |= PAUSE_FLOW_CTRL;
                if (hw->ksz_switch) {
                        sw_cfg(hw, KS8842_SWITCH_CTRL_1_OFFSET,
                                SWITCH_RX_FLOW_CTRL, pause->rx_pause);
                        sw_cfg(hw, KS8842_SWITCH_CTRL_1_OFFSET,
                                SWITCH_TX_FLOW_CTRL, pause->tx_pause);
                } else
                        set_flow_ctrl(hw, pause->rx_pause, pause->tx_pause);
        }
        mutex_unlock(&hw_priv->lock);

        return 0;
}

/**
 * netdev_get_ringparam - get tx/rx ring parameters
 * @dev:        Network device.
 * @ring:       Ethtool RING settings data structure.
 *
 * This procedure returns the TX/RX ring settings.
 */
static void netdev_get_ringparam(struct net_device *dev,
        struct ethtool_ringparam *ring)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;

        ring->tx_max_pending = (1 << 9);
        ring->tx_pending = hw->tx_desc_info.alloc;
        ring->rx_max_pending = (1 << 9);
        ring->rx_pending = hw->rx_desc_info.alloc;
}

#define STATS_LEN                       (TOTAL_PORT_COUNTER_NUM)

static struct {
        char string[ETH_GSTRING_LEN];
} ethtool_stats_keys[STATS_LEN] = {
        { "rx_lo_priority_octets" },
        { "rx_hi_priority_octets" },
        { "rx_undersize_packets" },
        { "rx_fragments" },
        { "rx_oversize_packets" },
        { "rx_jabbers" },
        { "rx_symbol_errors" },
        { "rx_crc_errors" },
        { "rx_align_errors" },
        { "rx_mac_ctrl_packets" },
        { "rx_pause_packets" },
        { "rx_bcast_packets" },
        { "rx_mcast_packets" },
        { "rx_ucast_packets" },
        { "rx_64_or_less_octet_packets" },
        { "rx_65_to_127_octet_packets" },
        { "rx_128_to_255_octet_packets" },
        { "rx_256_to_511_octet_packets" },
        { "rx_512_to_1023_octet_packets" },
        { "rx_1024_to_1522_octet_packets" },

        { "tx_lo_priority_octets" },
        { "tx_hi_priority_octets" },
        { "tx_late_collisions" },
        { "tx_pause_packets" },
        { "tx_bcast_packets" },
        { "tx_mcast_packets" },
        { "tx_ucast_packets" },
        { "tx_deferred" },
        { "tx_total_collisions" },
        { "tx_excessive_collisions" },
        { "tx_single_collisions" },
        { "tx_mult_collisions" },

        { "rx_discards" },
        { "tx_discards" },
};

/**
 * netdev_get_strings - get statistics identity strings
 * @dev:        Network device.
 * @stringset:  String set identifier.
 * @buf:        Buffer to store the strings.
 *
 * This procedure returns the strings used to identify the statistics.
 */
static void netdev_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;

        if (ETH_SS_STATS == stringset)
                memcpy(buf, &ethtool_stats_keys,
                        ETH_GSTRING_LEN * hw->mib_cnt);
}

/**
 * netdev_get_sset_count - get statistics size
 * @dev:        Network device.
 * @sset:       The statistics set number.
 *
 * This function returns the size of the statistics to be reported.
 *
 * Return size of the statistics to be reported.
 */
static int netdev_get_sset_count(struct net_device *dev, int sset)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;

        switch (sset) {
        case ETH_SS_STATS:
                return hw->mib_cnt;
        default:
                return -EOPNOTSUPP;
        }
}

/**
 * netdev_get_ethtool_stats - get network device statistics
 * @dev:        Network device.
 * @stats:      Ethtool statistics data structure.
 * @data:       Buffer to store the statistics.
 *
 * This procedure returns the statistics.
 */
static void netdev_get_ethtool_stats(struct net_device *dev,
        struct ethtool_stats *stats, u64 *data)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;
        struct ksz_port *port = &priv->port;
        int n_stats = stats->n_stats;
        int i;
        int n;
        int p;
        u64 counter[TOTAL_PORT_COUNTER_NUM];

        mutex_lock(&hw_priv->lock);
        n = SWITCH_PORT_NUM;
        for (i = 0, p = port->first_port; i < port->mib_port_cnt; i++, p++) {
                if (media_connected == hw->port_mib[p].state) {
                        hw_priv->counter[p].read = 1;

                        /* Remember first port that requests read. */
                        if (n == SWITCH_PORT_NUM)
                                n = p;
                }
        }
        mutex_unlock(&hw_priv->lock);

        if (n < SWITCH_PORT_NUM)
                schedule_work(&hw_priv->mib_read);

        if (1 == port->mib_port_cnt && n < SWITCH_PORT_NUM) {
                p = n;
                wait_event_interruptible_timeout(
                        hw_priv->counter[p].counter,
                        2 == hw_priv->counter[p].read,
                        HZ * 1);
        } else
                for (i = 0, p = n; i < port->mib_port_cnt - n; i++, p++) {
                        if (0 == i) {
                                wait_event_interruptible_timeout(
                                        hw_priv->counter[p].counter,
                                        2 == hw_priv->counter[p].read,
                                        HZ * 2);
                        } else if (hw->port_mib[p].cnt_ptr) {
                                wait_event_interruptible_timeout(
                                        hw_priv->counter[p].counter,
                                        2 == hw_priv->counter[p].read,
                                        HZ * 1);
                        }
                }

        get_mib_counters(hw, port->first_port, port->mib_port_cnt, counter);
        n = hw->mib_cnt;
        if (n > n_stats)
                n = n_stats;
        n_stats -= n;
        for (i = 0; i < n; i++)
                *data++ = counter[i];
}

/**
 * netdev_set_features - set receive checksum support
 * @dev:        Network device.
 * @features:   New device features (offloads).
 *
 * This function sets receive checksum support setting.
 *
 * Return 0 if successful; otherwise an error code.
 */
static int netdev_set_features(struct net_device *dev,
        netdev_features_t features)
{
        struct dev_priv *priv = netdev_priv(dev);
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;

        mutex_lock(&hw_priv->lock);

        /* see note in hw_setup() */
        if (features & NETIF_F_RXCSUM)
                hw->rx_cfg |= DMA_RX_CSUM_TCP | DMA_RX_CSUM_IP;
        else
                hw->rx_cfg &= ~(DMA_RX_CSUM_TCP | DMA_RX_CSUM_IP);

        if (hw->enabled)
                writel(hw->rx_cfg, hw->io + KS_DMA_RX_CTRL);

        mutex_unlock(&hw_priv->lock);

        return 0;
}

static const struct ethtool_ops netdev_ethtool_ops = {
        .nway_reset             = netdev_nway_reset,
        .get_link               = netdev_get_link,
        .get_drvinfo            = netdev_get_drvinfo,
        .get_regs_len           = netdev_get_regs_len,
        .get_regs               = netdev_get_regs,
        .get_wol                = netdev_get_wol,
        .set_wol                = netdev_set_wol,
        .get_msglevel           = netdev_get_msglevel,
        .set_msglevel           = netdev_set_msglevel,
        .get_eeprom_len         = netdev_get_eeprom_len,
        .get_eeprom             = netdev_get_eeprom,
        .set_eeprom             = netdev_set_eeprom,
        .get_pauseparam         = netdev_get_pauseparam,
        .set_pauseparam         = netdev_set_pauseparam,
        .get_ringparam          = netdev_get_ringparam,
        .get_strings            = netdev_get_strings,
        .get_sset_count         = netdev_get_sset_count,
        .get_ethtool_stats      = netdev_get_ethtool_stats,
        .get_link_ksettings     = netdev_get_link_ksettings,
        .set_link_ksettings     = netdev_set_link_ksettings,
};

/*
 * Hardware monitoring
 */

static void update_link(struct net_device *dev, struct dev_priv *priv,
        struct ksz_port *port)
{
        if (priv->media_state != port->linked->state) {
                priv->media_state = port->linked->state;
                if (netif_running(dev))
                        set_media_state(dev, media_connected);
        }
}

static void mib_read_work(struct work_struct *work)
{
        struct dev_info *hw_priv =
                container_of(work, struct dev_info, mib_read);
        struct ksz_hw *hw = &hw_priv->hw;
        struct ksz_port_mib *mib;
        int i;

        next_jiffies = jiffies;
        for (i = 0; i < hw->mib_port_cnt; i++) {
                mib = &hw->port_mib[i];

                /* Reading MIB counters or requested to read. */
                if (mib->cnt_ptr || 1 == hw_priv->counter[i].read) {

                        /* Need to process receive interrupt. */
                        if (port_r_cnt(hw, i))
                                break;
                        hw_priv->counter[i].read = 0;

                        /* Finish reading counters. */
                        if (0 == mib->cnt_ptr) {
                                hw_priv->counter[i].read = 2;
                                wake_up_interruptible(
                                        &hw_priv->counter[i].counter);
                        }
                } else if (time_after_eq(jiffies, hw_priv->counter[i].time)) {
                        /* Only read MIB counters when the port is connected. */
                        if (media_connected == mib->state)
                                hw_priv->counter[i].read = 1;
                        next_jiffies += HZ * 1 * hw->mib_port_cnt;
                        hw_priv->counter[i].time = next_jiffies;

                /* Port is just disconnected. */
                } else if (mib->link_down) {
                        mib->link_down = 0;

                        /* Read counters one last time after link is lost. */
                        hw_priv->counter[i].read = 1;
                }
        }
}

static void mib_monitor(struct timer_list *t)
{
        struct dev_info *hw_priv = from_timer(hw_priv, t, mib_timer_info.timer);

        mib_read_work(&hw_priv->mib_read);

        /* This is used to verify Wake-on-LAN is working. */
        if (hw_priv->pme_wait) {
                if (time_is_before_eq_jiffies(hw_priv->pme_wait)) {
                        hw_clr_wol_pme_status(&hw_priv->hw);
                        hw_priv->pme_wait = 0;
                }
        } else if (hw_chk_wol_pme_status(&hw_priv->hw)) {

                /* PME is asserted.  Wait 2 seconds to clear it. */
                hw_priv->pme_wait = jiffies + HZ * 2;
        }

        ksz_update_timer(&hw_priv->mib_timer_info);
}

/**
 * dev_monitor - periodic monitoring
 * @t:  timer list containing a network device pointer.
 *
 * This routine is run in a kernel timer to monitor the network device.
 */
static void dev_monitor(struct timer_list *t)
{
        struct dev_priv *priv = from_timer(priv, t, monitor_timer_info.timer);
        struct net_device *dev = priv->mii_if.dev;
        struct dev_info *hw_priv = priv->adapter;
        struct ksz_hw *hw = &hw_priv->hw;
        struct ksz_port *port = &priv->port;

        if (!(hw->features & LINK_INT_WORKING))
                port_get_link_speed(port);
        update_link(dev, priv, port);

        ksz_update_timer(&priv->monitor_timer_info);
}

/*
 * Linux network device interface functions
 */

/* Driver exported variables */

static int msg_enable;

static char *macaddr = ":";
static char *mac1addr = ":";

/*
 * This enables multiple network device mode for KSZ8842, which contains a
 * switch with two physical ports.  Some users like to take control of the
 * ports for running Spanning Tree Protocol.  The driver will create an
 * additional eth? device for the other port.
 *
 * Some limitations are the network devices cannot have different MTU and
 * multicast hash tables.
 */
static int multi_dev;

/*
 * As most users select multiple network device mode to use Spanning Tree
 * Protocol, this enables a feature in which most unicast and multicast packets
 * are forwarded inside the switch and not passed to the host.  Only packets
 * that need the host's attention are passed to it.  This prevents the host
 * wasting CPU time to examine each and every incoming packets and do the
 * forwarding itself.
 *
 * As the hack requires the private bridge header, the driver cannot compile
 * with just the kernel headers.
 *
 * Enabling STP support also turns on multiple network device mode.
 */
static int stp;

/*
 * This enables fast aging in the KSZ8842 switch.  Not sure what situation
 * needs that.  However, fast aging is used to flush the dynamic MAC table when
 * STP support is enabled.
 */
static int fast_aging;

/**
 * netdev_init - initialize network device.
 * @dev:        Network device.
 *
 * This function initializes the network device.
 *
 * Return 0 if successful; otherwise an error code indicating failure.
 */
static int __init netdev_init(struct net_device *dev)
{
        struct dev_priv *priv = netdev_priv(dev);

        /* 500 ms timeout */
        ksz_init_timer(&priv->monitor_timer_info, 500 * HZ / 1000,
                dev_monitor);

        /* 500 ms timeout */
        dev->watchdog_timeo = HZ / 2;

        dev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_RXCSUM;

        /*
         * Hardware does not really support IPv6 checksum generation, but
         * driver actually runs faster with this on.
         */
        dev->hw_features |= NETIF_F_IPV6_CSUM;

        dev->features |= dev->hw_features;

        sema_init(&priv->proc_sem, 1);

        priv->mii_if.phy_id_mask = 0x1;
        priv->mii_if.reg_num_mask = 0x7;
        priv->mii_if.dev = dev;
        priv->mii_if.mdio_read = mdio_read;
        priv->mii_if.mdio_write = mdio_write;
        priv->mii_if.phy_id = priv->port.first_port + 1;

        priv->msg_enable = netif_msg_init(msg_enable,
                (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK));

        return 0;
}

static const struct net_device_ops netdev_ops = {
        .ndo_init               = netdev_init,
        .ndo_open               = netdev_open,
        .ndo_stop               = netdev_close,
        .ndo_get_stats          = netdev_query_statistics,
        .ndo_start_xmit         = netdev_tx,
        .ndo_tx_timeout         = netdev_tx_timeout,
        .ndo_change_mtu         = netdev_change_mtu,
        .ndo_set_features       = netdev_set_features,
        .ndo_set_mac_address    = netdev_set_mac_address,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_eth_ioctl          = netdev_ioctl,
        .ndo_set_rx_mode        = netdev_set_rx_mode,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = netdev_netpoll,
#endif
};

static void netdev_free(struct net_device *dev)
{
        if (dev->watchdog_timeo)
                unregister_netdev(dev);

        free_netdev(dev);
}

struct platform_info {
        struct dev_info dev_info;
        struct net_device *netdev[SWITCH_PORT_NUM];
};

static int net_device_present;

static void get_mac_addr(struct dev_info *hw_priv, u8 *macaddr, int port)
{
        int i;
        int j;
        int got_num;
        int num;

        i = j = num = got_num = 0;
        while (j < ETH_ALEN) {
                if (macaddr[i]) {
                        int digit;

                        got_num = 1;
                        digit = hex_to_bin(macaddr[i]);
                        if (digit >= 0)
                                num = num * 16 + digit;
                        else if (':' == macaddr[i])
                                got_num = 2;
                        else
                                break;
                } else if (got_num)
                        got_num = 2;
                else
                        break;
                if (2 == got_num) {
                        if (MAIN_PORT == port) {
                                hw_priv->hw.override_addr[j++] = (u8) num;
                                hw_priv->hw.override_addr[5] +=
                                        hw_priv->hw.id;
                        } else {
                                hw_priv->hw.ksz_switch->other_addr[j++] =
                                        (u8) num;
                                hw_priv->hw.ksz_switch->other_addr[5] +=
                                        hw_priv->hw.id;
                        }
                        num = got_num = 0;
                }
                i++;
        }
        if (ETH_ALEN == j) {
                if (MAIN_PORT == port)
                        hw_priv->hw.mac_override = 1;
        }
}

#define KS884X_DMA_MASK                 (~0x0UL)

static void read_other_addr(struct ksz_hw *hw)
{
        int i;
        u16 data[3];
        struct ksz_switch *sw = hw->ksz_switch;

        for (i = 0; i < 3; i++)
                data[i] = eeprom_read(hw, i + EEPROM_DATA_OTHER_MAC_ADDR);
        if ((data[0] || data[1] || data[2]) && data[0] != 0xffff) {
                sw->other_addr[5] = (u8) data[0];
                sw->other_addr[4] = (u8)(data[0] >> 8);
                sw->other_addr[3] = (u8) data[1];
                sw->other_addr[2] = (u8)(data[1] >> 8);
                sw->other_addr[1] = (u8) data[2];
                sw->other_addr[0] = (u8)(data[2] >> 8);
        }
}

#ifndef PCI_VENDOR_ID_MICREL_KS
#define PCI_VENDOR_ID_MICREL_KS         0x16c6
#endif

static int pcidev_init(struct pci_dev *pdev, const struct pci_device_id *id)
{
        struct net_device *dev;
        struct dev_priv *priv;
        struct dev_info *hw_priv;
        struct ksz_hw *hw;
        struct platform_info *info;
        struct ksz_port *port;
        unsigned long reg_base;
        unsigned long reg_len;
        int cnt;
        int i;
        int mib_port_count;
        int pi;
        int port_count;
        int result;
        char banner[sizeof(version)];
        struct ksz_switch *sw = NULL;

        result = pci_enable_device(pdev);
        if (result)
                return result;

        result = -ENODEV;

        if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)) ||
            dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)))
                return result;

        reg_base = pci_resource_start(pdev, 0);
        reg_len = pci_resource_len(pdev, 0);
        if ((pci_resource_flags(pdev, 0) & IORESOURCE_IO) != 0)
                return result;

        if (!request_mem_region(reg_base, reg_len, DRV_NAME))
                return result;
        pci_set_master(pdev);

        result = -ENOMEM;

        info = kzalloc(sizeof(struct platform_info), GFP_KERNEL);
        if (!info)
                goto pcidev_init_dev_err;

        hw_priv = &info->dev_info;
        hw_priv->pdev = pdev;

        hw = &hw_priv->hw;

        hw->io = ioremap(reg_base, reg_len);
        if (!hw->io)
                goto pcidev_init_io_err;

        cnt = hw_init(hw);
        if (!cnt) {
                if (msg_enable & NETIF_MSG_PROBE)
                        pr_alert("chip not detected\n");
                result = -ENODEV;
                goto pcidev_init_alloc_err;
        }

        snprintf(banner, sizeof(banner), "%s", version);
        banner[13] = cnt + '0';         /* Replace x in "Micrel KSZ884x" */
        dev_info(&hw_priv->pdev->dev, "%s\n", banner);
        dev_dbg(&hw_priv->pdev->dev, "Mem = %p; IRQ = %d\n", hw->io, pdev->irq);

        /* Assume device is KSZ8841. */
        hw->dev_count = 1;
        port_count = 1;
        mib_port_count = 1;
        hw->addr_list_size = 0;
        hw->mib_cnt = PORT_COUNTER_NUM;
        hw->mib_port_cnt = 1;

        /* KSZ8842 has a switch with multiple ports. */
        if (2 == cnt) {
                if (fast_aging)
                        hw->overrides |= FAST_AGING;

                hw->mib_cnt = TOTAL_PORT_COUNTER_NUM;

                /* Multiple network device interfaces are required. */
                if (multi_dev) {
                        hw->dev_count = SWITCH_PORT_NUM;
                        hw->addr_list_size = SWITCH_PORT_NUM - 1;
                }

                /* Single network device has multiple ports. */
                if (1 == hw->dev_count) {
                        port_count = SWITCH_PORT_NUM;
                        mib_port_count = SWITCH_PORT_NUM;
                }
                hw->mib_port_cnt = TOTAL_PORT_NUM;
                hw->ksz_switch = kzalloc(sizeof(struct ksz_switch), GFP_KERNEL);
                if (!hw->ksz_switch)
                        goto pcidev_init_alloc_err;

                sw = hw->ksz_switch;
        }
        for (i = 0; i < hw->mib_port_cnt; i++)
                hw->port_mib[i].mib_start = 0;

        hw->parent = hw_priv;

        /* Default MTU is 1500. */
        hw_priv->mtu = (REGULAR_RX_BUF_SIZE + 3) & ~3;

        if (ksz_alloc_mem(hw_priv))
                goto pcidev_init_mem_err;

        hw_priv->hw.id = net_device_present;

        spin_lock_init(&hw_priv->hwlock);
        mutex_init(&hw_priv->lock);

        for (i = 0; i < TOTAL_PORT_NUM; i++)
                init_waitqueue_head(&hw_priv->counter[i].counter);

        if (macaddr[0] != ':')
                get_mac_addr(hw_priv, macaddr, MAIN_PORT);

        /* Read MAC address and initialize override address if not overridden. */
        hw_read_addr(hw);

        /* Multiple device interfaces mode requires a second MAC address. */
        if (hw->dev_count > 1) {
                memcpy(sw->other_addr, hw->override_addr, ETH_ALEN);
                read_other_addr(hw);
                if (mac1addr[0] != ':')
                        get_mac_addr(hw_priv, mac1addr, OTHER_PORT);
        }

        hw_setup(hw);
        if (hw->ksz_switch)
                sw_setup(hw);
        else {
                hw_priv->wol_support = WOL_SUPPORT;
                hw_priv->wol_enable = 0;
        }

        INIT_WORK(&hw_priv->mib_read, mib_read_work);

        /* 500 ms timeout */
        ksz_init_timer(&hw_priv->mib_timer_info, 500 * HZ / 1000,
                mib_monitor);

        for (i = 0; i < hw->dev_count; i++) {
                dev = alloc_etherdev(sizeof(struct dev_priv));
                if (!dev)
                        goto pcidev_init_reg_err;
                SET_NETDEV_DEV(dev, &pdev->dev);
                info->netdev[i] = dev;

                priv = netdev_priv(dev);
                priv->adapter = hw_priv;
                priv->id = net_device_present++;

                port = &priv->port;
                port->port_cnt = port_count;
                port->mib_port_cnt = mib_port_count;
                port->first_port = i;
                port->flow_ctrl = PHY_FLOW_CTRL;

                port->hw = hw;
                port->linked = &hw->port_info[port->first_port];

                for (cnt = 0, pi = i; cnt < port_count; cnt++, pi++) {
                        hw->port_info[pi].port_id = pi;
                        hw->port_info[pi].pdev = dev;
                        hw->port_info[pi].state = media_disconnected;
                }

                dev->mem_start = (unsigned long) hw->io;
                dev->mem_end = dev->mem_start + reg_len - 1;
                dev->irq = pdev->irq;
                if (MAIN_PORT == i)
                        memcpy(dev->dev_addr, hw_priv->hw.override_addr,
                               ETH_ALEN);
                else {
                        memcpy(dev->dev_addr, sw->other_addr, ETH_ALEN);
                        if (ether_addr_equal(sw->other_addr, hw->override_addr))
                                dev->dev_addr[5] += port->first_port;
                }

                dev->netdev_ops = &netdev_ops;
                dev->ethtool_ops = &netdev_ethtool_ops;

                /* MTU range: 60 - 1894 */
                dev->min_mtu = ETH_ZLEN;
                dev->max_mtu = MAX_RX_BUF_SIZE -
                               (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);

                if (register_netdev(dev))
                        goto pcidev_init_reg_err;
                port_set_power_saving(port, true);
        }

        pci_dev_get(hw_priv->pdev);
        pci_set_drvdata(pdev, info);
        return 0;

pcidev_init_reg_err:
        for (i = 0; i < hw->dev_count; i++) {
                if (info->netdev[i]) {
                        netdev_free(info->netdev[i]);
                        info->netdev[i] = NULL;
                }
        }

pcidev_init_mem_err:
        ksz_free_mem(hw_priv);
        kfree(hw->ksz_switch);

pcidev_init_alloc_err:
        iounmap(hw->io);

pcidev_init_io_err:
        kfree(info);

pcidev_init_dev_err:
        release_mem_region(reg_base, reg_len);

        return result;
}

static void pcidev_exit(struct pci_dev *pdev)
{
        int i;
        struct platform_info *info = pci_get_drvdata(pdev);
        struct dev_info *hw_priv = &info->dev_info;

        release_mem_region(pci_resource_start(pdev, 0),
                pci_resource_len(pdev, 0));
        for (i = 0; i < hw_priv->hw.dev_count; i++) {
                if (info->netdev[i])
                        netdev_free(info->netdev[i]);
        }
        if (hw_priv->hw.io)
                iounmap(hw_priv->hw.io);
        ksz_free_mem(hw_priv);
        kfree(hw_priv->hw.ksz_switch);
        pci_dev_put(hw_priv->pdev);
        kfree(info);
}

static int __maybe_unused pcidev_resume(struct device *dev_d)
{
        int i;
        struct platform_info *info = dev_get_drvdata(dev_d);
        struct dev_info *hw_priv = &info->dev_info;
        struct ksz_hw *hw = &hw_priv->hw;

        device_wakeup_disable(dev_d);

        if (hw_priv->wol_enable)
                hw_cfg_wol_pme(hw, 0);
        for (i = 0; i < hw->dev_count; i++) {
                if (info->netdev[i]) {
                        struct net_device *dev = info->netdev[i];

                        if (netif_running(dev)) {
                                netdev_open(dev);
                                netif_device_attach(dev);
                        }
                }
        }
        return 0;
}

static int __maybe_unused pcidev_suspend(struct device *dev_d)
{
        int i;
        struct platform_info *info = dev_get_drvdata(dev_d);
        struct dev_info *hw_priv = &info->dev_info;
        struct ksz_hw *hw = &hw_priv->hw;

        /* Need to find a way to retrieve the device IP address. */
        static const u8 net_addr[] = { 192, 168, 1, 1 };

        for (i = 0; i < hw->dev_count; i++) {
                if (info->netdev[i]) {
                        struct net_device *dev = info->netdev[i];

                        if (netif_running(dev)) {
                                netif_device_detach(dev);
                                netdev_close(dev);
                        }
                }
        }
        if (hw_priv->wol_enable) {
                hw_enable_wol(hw, hw_priv->wol_enable, net_addr);
                hw_cfg_wol_pme(hw, 1);
        }

        device_wakeup_enable(dev_d);
        return 0;
}

static char pcidev_name[] = "ksz884xp";

static const struct pci_device_id pcidev_table[] = {
        { PCI_VENDOR_ID_MICREL_KS, 0x8841,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
        { PCI_VENDOR_ID_MICREL_KS, 0x8842,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
        { 0 }
};

MODULE_DEVICE_TABLE(pci, pcidev_table);

static SIMPLE_DEV_PM_OPS(pcidev_pm_ops, pcidev_suspend, pcidev_resume);

static struct pci_driver pci_device_driver = {
        .driver.pm      = &pcidev_pm_ops,
        .name           = pcidev_name,
        .id_table       = pcidev_table,
        .probe          = pcidev_init,
        .remove         = pcidev_exit
};

module_pci_driver(pci_device_driver);

MODULE_DESCRIPTION("KSZ8841/2 PCI network driver");
MODULE_AUTHOR("Tristram Ha <Tristram.Ha@micrel.com>");
MODULE_LICENSE("GPL");

module_param_named(message, msg_enable, int, 0);
MODULE_PARM_DESC(message, "Message verbosity level (0=none, 31=all)");

module_param(macaddr, charp, 0);
module_param(mac1addr, charp, 0);
module_param(fast_aging, int, 0);
module_param(multi_dev, int, 0);
module_param(stp, int, 0);
MODULE_PARM_DESC(macaddr, "MAC address");
MODULE_PARM_DESC(mac1addr, "Second MAC address");
MODULE_PARM_DESC(fast_aging, "Fast aging");
MODULE_PARM_DESC(multi_dev, "Multiple device interfaces");
MODULE_PARM_DESC(stp, "STP support");