+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 1999 - 2010 Intel Corporation.
- * Copyright (C) 2010 LAPIS SEMICONDUCTOR CO., LTD.
- */
-
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-#include <linux/ethtool.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/pci.h>
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/netdevice.h>
-#include <linux/skbuff.h>
-#include <linux/can.h>
-#include <linux/can/dev.h>
-#include <linux/can/error.h>
-
-#define PCH_CTRL_INIT BIT(0) /* The INIT bit of CANCONT register. */
-#define PCH_CTRL_IE BIT(1) /* The IE bit of CAN control register */
-#define PCH_CTRL_IE_SIE_EIE (BIT(3) | BIT(2) | BIT(1))
-#define PCH_CTRL_CCE BIT(6)
-#define PCH_CTRL_OPT BIT(7) /* The OPT bit of CANCONT register. */
-#define PCH_OPT_SILENT BIT(3) /* The Silent bit of CANOPT reg. */
-#define PCH_OPT_LBACK BIT(4) /* The LoopBack bit of CANOPT reg. */
-
-#define PCH_CMASK_RX_TX_SET 0x00f3
-#define PCH_CMASK_RX_TX_GET 0x0073
-#define PCH_CMASK_ALL 0xff
-#define PCH_CMASK_NEWDAT BIT(2)
-#define PCH_CMASK_CLRINTPND BIT(3)
-#define PCH_CMASK_CTRL BIT(4)
-#define PCH_CMASK_ARB BIT(5)
-#define PCH_CMASK_MASK BIT(6)
-#define PCH_CMASK_RDWR BIT(7)
-#define PCH_IF_MCONT_NEWDAT BIT(15)
-#define PCH_IF_MCONT_MSGLOST BIT(14)
-#define PCH_IF_MCONT_INTPND BIT(13)
-#define PCH_IF_MCONT_UMASK BIT(12)
-#define PCH_IF_MCONT_TXIE BIT(11)
-#define PCH_IF_MCONT_RXIE BIT(10)
-#define PCH_IF_MCONT_RMTEN BIT(9)
-#define PCH_IF_MCONT_TXRQXT BIT(8)
-#define PCH_IF_MCONT_EOB BIT(7)
-#define PCH_IF_MCONT_DLC (BIT(0) | BIT(1) | BIT(2) | BIT(3))
-#define PCH_MASK2_MDIR_MXTD (BIT(14) | BIT(15))
-#define PCH_ID2_DIR BIT(13)
-#define PCH_ID2_XTD BIT(14)
-#define PCH_ID_MSGVAL BIT(15)
-#define PCH_IF_CREQ_BUSY BIT(15)
-
-#define PCH_STATUS_INT 0x8000
-#define PCH_RP 0x00008000
-#define PCH_REC 0x00007f00
-#define PCH_TEC 0x000000ff
-
-#define PCH_TX_OK BIT(3)
-#define PCH_RX_OK BIT(4)
-#define PCH_EPASSIV BIT(5)
-#define PCH_EWARN BIT(6)
-#define PCH_BUS_OFF BIT(7)
-
-/* bit position of certain controller bits. */
-#define PCH_BIT_BRP_SHIFT 0
-#define PCH_BIT_SJW_SHIFT 6
-#define PCH_BIT_TSEG1_SHIFT 8
-#define PCH_BIT_TSEG2_SHIFT 12
-#define PCH_BIT_BRPE_BRPE_SHIFT 6
-
-#define PCH_MSK_BITT_BRP 0x3f
-#define PCH_MSK_BRPE_BRPE 0x3c0
-#define PCH_MSK_CTRL_IE_SIE_EIE 0x07
-#define PCH_COUNTER_LIMIT 10
-
-#define PCH_CAN_CLK 50000000 /* 50MHz */
-
-/*
- * Define the number of message object.
- * PCH CAN communications are done via Message RAM.
- * The Message RAM consists of 32 message objects.
- */
-#define PCH_RX_OBJ_NUM 26
-#define PCH_TX_OBJ_NUM 6
-#define PCH_RX_OBJ_START 1
-#define PCH_RX_OBJ_END PCH_RX_OBJ_NUM
-#define PCH_TX_OBJ_START (PCH_RX_OBJ_END + 1)
-#define PCH_TX_OBJ_END (PCH_RX_OBJ_NUM + PCH_TX_OBJ_NUM)
-
-#define PCH_FIFO_THRESH 16
-
-/* TxRqst2 show status of MsgObjNo.17~32 */
-#define PCH_TREQ2_TX_MASK (((1 << PCH_TX_OBJ_NUM) - 1) <<\
- (PCH_RX_OBJ_END - 16))
-
-enum pch_ifreg {
- PCH_RX_IFREG,
- PCH_TX_IFREG,
-};
-
-enum pch_can_err {
- PCH_STUF_ERR = 1,
- PCH_FORM_ERR,
- PCH_ACK_ERR,
- PCH_BIT1_ERR,
- PCH_BIT0_ERR,
- PCH_CRC_ERR,
- PCH_LEC_ALL,
-};
-
-enum pch_can_mode {
- PCH_CAN_ENABLE,
- PCH_CAN_DISABLE,
- PCH_CAN_ALL,
- PCH_CAN_NONE,
- PCH_CAN_STOP,
- PCH_CAN_RUN,
-};
-
-struct pch_can_if_regs {
- u32 creq;
- u32 cmask;
- u32 mask1;
- u32 mask2;
- u32 id1;
- u32 id2;
- u32 mcont;
- u32 data[4];
- u32 rsv[13];
-};
-
-struct pch_can_regs {
- u32 cont;
- u32 stat;
- u32 errc;
- u32 bitt;
- u32 intr;
- u32 opt;
- u32 brpe;
- u32 reserve;
- struct pch_can_if_regs ifregs[2]; /* [0]=if1 [1]=if2 */
- u32 reserve1[8];
- u32 treq1;
- u32 treq2;
- u32 reserve2[6];
- u32 data1;
- u32 data2;
- u32 reserve3[6];
- u32 canipend1;
- u32 canipend2;
- u32 reserve4[6];
- u32 canmval1;
- u32 canmval2;
- u32 reserve5[37];
- u32 srst;
-};
-
-struct pch_can_priv {
- struct can_priv can;
- struct pci_dev *dev;
- u32 tx_enable[PCH_TX_OBJ_END];
- u32 rx_enable[PCH_TX_OBJ_END];
- u32 rx_link[PCH_TX_OBJ_END];
- u32 int_enables;
- struct net_device *ndev;
- struct pch_can_regs __iomem *regs;
- struct napi_struct napi;
- int tx_obj; /* Point next Tx Obj index */
- int use_msi;
-};
-
-static const struct can_bittiming_const pch_can_bittiming_const = {
- .name = KBUILD_MODNAME,
- .tseg1_min = 2,
- .tseg1_max = 16,
- .tseg2_min = 1,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 1024, /* 6bit + extended 4bit */
- .brp_inc = 1,
-};
-
-static const struct pci_device_id pch_pci_tbl[] = {
- {PCI_VENDOR_ID_INTEL, 0x8818, PCI_ANY_ID, PCI_ANY_ID,},
- {0,}
-};
-MODULE_DEVICE_TABLE(pci, pch_pci_tbl);
-
-static inline void pch_can_bit_set(void __iomem *addr, u32 mask)
-{
- iowrite32(ioread32(addr) | mask, addr);
-}
-
-static inline void pch_can_bit_clear(void __iomem *addr, u32 mask)
-{
- iowrite32(ioread32(addr) & ~mask, addr);
-}
-
-static void pch_can_set_run_mode(struct pch_can_priv *priv,
- enum pch_can_mode mode)
-{
- switch (mode) {
- case PCH_CAN_RUN:
- pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_INIT);
- break;
-
- case PCH_CAN_STOP:
- pch_can_bit_set(&priv->regs->cont, PCH_CTRL_INIT);
- break;
-
- default:
- netdev_err(priv->ndev, "%s -> Invalid Mode.\n", __func__);
- break;
- }
-}
-
-static void pch_can_set_optmode(struct pch_can_priv *priv)
-{
- u32 reg_val = ioread32(&priv->regs->opt);
-
- if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
- reg_val |= PCH_OPT_SILENT;
-
- if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
- reg_val |= PCH_OPT_LBACK;
-
- pch_can_bit_set(&priv->regs->cont, PCH_CTRL_OPT);
- iowrite32(reg_val, &priv->regs->opt);
-}
-
-static void pch_can_rw_msg_obj(void __iomem *creq_addr, u32 num)
-{
- int counter = PCH_COUNTER_LIMIT;
- u32 ifx_creq;
-
- iowrite32(num, creq_addr);
- while (counter) {
- ifx_creq = ioread32(creq_addr) & PCH_IF_CREQ_BUSY;
- if (!ifx_creq)
- break;
- counter--;
- udelay(1);
- }
- if (!counter)
- pr_err("%s:IF1 BUSY Flag is set forever.\n", __func__);
-}
-
-static void pch_can_set_int_enables(struct pch_can_priv *priv,
- enum pch_can_mode interrupt_no)
-{
- switch (interrupt_no) {
- case PCH_CAN_DISABLE:
- pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_IE);
- break;
-
- case PCH_CAN_ALL:
- pch_can_bit_set(&priv->regs->cont, PCH_CTRL_IE_SIE_EIE);
- break;
-
- case PCH_CAN_NONE:
- pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_IE_SIE_EIE);
- break;
-
- default:
- netdev_err(priv->ndev, "Invalid interrupt number.\n");
- break;
- }
-}
-
-static void pch_can_set_rxtx(struct pch_can_priv *priv, u32 buff_num,
- int set, enum pch_ifreg dir)
-{
- u32 ie;
-
- if (dir)
- ie = PCH_IF_MCONT_TXIE;
- else
- ie = PCH_IF_MCONT_RXIE;
-
- /* Reading the Msg buffer from Message RAM to IF1/2 registers. */
- iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[dir].cmask);
- pch_can_rw_msg_obj(&priv->regs->ifregs[dir].creq, buff_num);
-
- /* Setting the IF1/2MASK1 register to access MsgVal and RxIE bits */
- iowrite32(PCH_CMASK_RDWR | PCH_CMASK_ARB | PCH_CMASK_CTRL,
- &priv->regs->ifregs[dir].cmask);
-
- if (set) {
- /* Setting the MsgVal and RxIE/TxIE bits */
- pch_can_bit_set(&priv->regs->ifregs[dir].mcont, ie);
- pch_can_bit_set(&priv->regs->ifregs[dir].id2, PCH_ID_MSGVAL);
- } else {
- /* Clearing the MsgVal and RxIE/TxIE bits */
- pch_can_bit_clear(&priv->regs->ifregs[dir].mcont, ie);
- pch_can_bit_clear(&priv->regs->ifregs[dir].id2, PCH_ID_MSGVAL);
- }
-
- pch_can_rw_msg_obj(&priv->regs->ifregs[dir].creq, buff_num);
-}
-
-static void pch_can_set_rx_all(struct pch_can_priv *priv, int set)
-{
- int i;
-
- /* Traversing to obtain the object configured as receivers. */
- for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++)
- pch_can_set_rxtx(priv, i, set, PCH_RX_IFREG);
-}
-
-static void pch_can_set_tx_all(struct pch_can_priv *priv, int set)
-{
- int i;
-
- /* Traversing to obtain the object configured as transmit object. */
- for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++)
- pch_can_set_rxtx(priv, i, set, PCH_TX_IFREG);
-}
-
-static u32 pch_can_int_pending(struct pch_can_priv *priv)
-{
- return ioread32(&priv->regs->intr) & 0xffff;
-}
-
-static void pch_can_clear_if_buffers(struct pch_can_priv *priv)
-{
- int i; /* Msg Obj ID (1~32) */
-
- for (i = PCH_RX_OBJ_START; i <= PCH_TX_OBJ_END; i++) {
- iowrite32(PCH_CMASK_RX_TX_SET, &priv->regs->ifregs[0].cmask);
- iowrite32(0xffff, &priv->regs->ifregs[0].mask1);
- iowrite32(0xffff, &priv->regs->ifregs[0].mask2);
- iowrite32(0x0, &priv->regs->ifregs[0].id1);
- iowrite32(0x0, &priv->regs->ifregs[0].id2);
- iowrite32(0x0, &priv->regs->ifregs[0].mcont);
- iowrite32(0x0, &priv->regs->ifregs[0].data[0]);
- iowrite32(0x0, &priv->regs->ifregs[0].data[1]);
- iowrite32(0x0, &priv->regs->ifregs[0].data[2]);
- iowrite32(0x0, &priv->regs->ifregs[0].data[3]);
- iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK |
- PCH_CMASK_ARB | PCH_CMASK_CTRL,
- &priv->regs->ifregs[0].cmask);
- pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, i);
- }
-}
-
-static void pch_can_config_rx_tx_buffers(struct pch_can_priv *priv)
-{
- int i;
-
- for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) {
- iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask);
- pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, i);
-
- iowrite32(0x0, &priv->regs->ifregs[0].id1);
- iowrite32(0x0, &priv->regs->ifregs[0].id2);
-
- pch_can_bit_set(&priv->regs->ifregs[0].mcont,
- PCH_IF_MCONT_UMASK);
-
- /* In case FIFO mode, Last EoB of Rx Obj must be 1 */
- if (i == PCH_RX_OBJ_END)
- pch_can_bit_set(&priv->regs->ifregs[0].mcont,
- PCH_IF_MCONT_EOB);
- else
- pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
- PCH_IF_MCONT_EOB);
-
- iowrite32(0, &priv->regs->ifregs[0].mask1);
- pch_can_bit_clear(&priv->regs->ifregs[0].mask2,
- 0x1fff | PCH_MASK2_MDIR_MXTD);
-
- /* Setting CMASK for writing */
- iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK | PCH_CMASK_ARB |
- PCH_CMASK_CTRL, &priv->regs->ifregs[0].cmask);
-
- pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, i);
- }
-
- for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++) {
- iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[1].cmask);
- pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, i);
-
- /* Resetting DIR bit for reception */
- iowrite32(0x0, &priv->regs->ifregs[1].id1);
- iowrite32(PCH_ID2_DIR, &priv->regs->ifregs[1].id2);
-
- /* Setting EOB bit for transmitter */
- iowrite32(PCH_IF_MCONT_EOB | PCH_IF_MCONT_UMASK,
- &priv->regs->ifregs[1].mcont);
-
- iowrite32(0, &priv->regs->ifregs[1].mask1);
- pch_can_bit_clear(&priv->regs->ifregs[1].mask2, 0x1fff);
-
- /* Setting CMASK for writing */
- iowrite32(PCH_CMASK_RDWR | PCH_CMASK_MASK | PCH_CMASK_ARB |
- PCH_CMASK_CTRL, &priv->regs->ifregs[1].cmask);
-
- pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, i);
- }
-}
-
-static void pch_can_init(struct pch_can_priv *priv)
-{
- /* Stopping the Can device. */
- pch_can_set_run_mode(priv, PCH_CAN_STOP);
-
- /* Clearing all the message object buffers. */
- pch_can_clear_if_buffers(priv);
-
- /* Configuring the respective message object as either rx/tx object. */
- pch_can_config_rx_tx_buffers(priv);
-
- /* Enabling the interrupts. */
- pch_can_set_int_enables(priv, PCH_CAN_ALL);
-}
-
-static void pch_can_release(struct pch_can_priv *priv)
-{
- /* Stooping the CAN device. */
- pch_can_set_run_mode(priv, PCH_CAN_STOP);
-
- /* Disabling the interrupts. */
- pch_can_set_int_enables(priv, PCH_CAN_NONE);
-
- /* Disabling all the receive object. */
- pch_can_set_rx_all(priv, 0);
-
- /* Disabling all the transmit object. */
- pch_can_set_tx_all(priv, 0);
-}
-
-/* This function clears interrupt(s) from the CAN device. */
-static void pch_can_int_clr(struct pch_can_priv *priv, u32 mask)
-{
- /* Clear interrupt for transmit object */
- if ((mask >= PCH_RX_OBJ_START) && (mask <= PCH_RX_OBJ_END)) {
- /* Setting CMASK for clearing the reception interrupts. */
- iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL | PCH_CMASK_ARB,
- &priv->regs->ifregs[0].cmask);
-
- /* Clearing the Dir bit. */
- pch_can_bit_clear(&priv->regs->ifregs[0].id2, PCH_ID2_DIR);
-
- /* Clearing NewDat & IntPnd */
- pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
- PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_INTPND);
-
- pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, mask);
- } else if ((mask >= PCH_TX_OBJ_START) && (mask <= PCH_TX_OBJ_END)) {
- /*
- * Setting CMASK for clearing interrupts for frame transmission.
- */
- iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL | PCH_CMASK_ARB,
- &priv->regs->ifregs[1].cmask);
-
- /* Resetting the ID registers. */
- pch_can_bit_set(&priv->regs->ifregs[1].id2,
- PCH_ID2_DIR | (0x7ff << 2));
- iowrite32(0x0, &priv->regs->ifregs[1].id1);
-
- /* Clearing NewDat, TxRqst & IntPnd */
- pch_can_bit_clear(&priv->regs->ifregs[1].mcont,
- PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_INTPND |
- PCH_IF_MCONT_TXRQXT);
- pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, mask);
- }
-}
-
-static void pch_can_reset(struct pch_can_priv *priv)
-{
- /* write to sw reset register */
- iowrite32(1, &priv->regs->srst);
- iowrite32(0, &priv->regs->srst);
-}
-
-static void pch_can_error(struct net_device *ndev, u32 status)
-{
- struct sk_buff *skb;
- struct pch_can_priv *priv = netdev_priv(ndev);
- struct can_frame *cf;
- u32 errc, lec;
- struct net_device_stats *stats = &(priv->ndev->stats);
- enum can_state state = priv->can.state;
-
- skb = alloc_can_err_skb(ndev, &cf);
- if (!skb)
- return;
-
- errc = ioread32(&priv->regs->errc);
- if (status & PCH_BUS_OFF) {
- pch_can_set_tx_all(priv, 0);
- pch_can_set_rx_all(priv, 0);
- state = CAN_STATE_BUS_OFF;
- cf->can_id |= CAN_ERR_BUSOFF;
- priv->can.can_stats.bus_off++;
- can_bus_off(ndev);
- } else {
- cf->can_id |= CAN_ERR_CNT;
- cf->data[6] = errc & PCH_TEC;
- cf->data[7] = (errc & PCH_REC) >> 8;
- }
-
- /* Warning interrupt. */
- if (status & PCH_EWARN) {
- state = CAN_STATE_ERROR_WARNING;
- priv->can.can_stats.error_warning++;
- cf->can_id |= CAN_ERR_CRTL;
- if (((errc & PCH_REC) >> 8) > 96)
- cf->data[1] |= CAN_ERR_CRTL_RX_WARNING;
- if ((errc & PCH_TEC) > 96)
- cf->data[1] |= CAN_ERR_CRTL_TX_WARNING;
- netdev_dbg(ndev,
- "%s -> Error Counter is more than 96.\n", __func__);
- }
- /* Error passive interrupt. */
- if (status & PCH_EPASSIV) {
- priv->can.can_stats.error_passive++;
- state = CAN_STATE_ERROR_PASSIVE;
- cf->can_id |= CAN_ERR_CRTL;
- if (errc & PCH_RP)
- cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
- if ((errc & PCH_TEC) > 127)
- cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;
- netdev_dbg(ndev,
- "%s -> CAN controller is ERROR PASSIVE .\n", __func__);
- }
-
- lec = status & PCH_LEC_ALL;
- switch (lec) {
- case PCH_STUF_ERR:
- cf->data[2] |= CAN_ERR_PROT_STUFF;
- priv->can.can_stats.bus_error++;
- stats->rx_errors++;
- break;
- case PCH_FORM_ERR:
- cf->data[2] |= CAN_ERR_PROT_FORM;
- priv->can.can_stats.bus_error++;
- stats->rx_errors++;
- break;
- case PCH_ACK_ERR:
- cf->can_id |= CAN_ERR_ACK;
- priv->can.can_stats.bus_error++;
- stats->rx_errors++;
- break;
- case PCH_BIT1_ERR:
- case PCH_BIT0_ERR:
- cf->data[2] |= CAN_ERR_PROT_BIT;
- priv->can.can_stats.bus_error++;
- stats->rx_errors++;
- break;
- case PCH_CRC_ERR:
- cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
- priv->can.can_stats.bus_error++;
- stats->rx_errors++;
- break;
- case PCH_LEC_ALL: /* Written by CPU. No error status */
- break;
- }
-
- priv->can.state = state;
- netif_receive_skb(skb);
-}
-
-static irqreturn_t pch_can_interrupt(int irq, void *dev_id)
-{
- struct net_device *ndev = (struct net_device *)dev_id;
- struct pch_can_priv *priv = netdev_priv(ndev);
-
- if (!pch_can_int_pending(priv))
- return IRQ_NONE;
-
- pch_can_set_int_enables(priv, PCH_CAN_NONE);
- napi_schedule(&priv->napi);
- return IRQ_HANDLED;
-}
-
-static void pch_fifo_thresh(struct pch_can_priv *priv, int obj_id)
-{
- if (obj_id < PCH_FIFO_THRESH) {
- iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL |
- PCH_CMASK_ARB, &priv->regs->ifregs[0].cmask);
-
- /* Clearing the Dir bit. */
- pch_can_bit_clear(&priv->regs->ifregs[0].id2, PCH_ID2_DIR);
-
- /* Clearing NewDat & IntPnd */
- pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
- PCH_IF_MCONT_INTPND);
- pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, obj_id);
- } else if (obj_id > PCH_FIFO_THRESH) {
- pch_can_int_clr(priv, obj_id);
- } else if (obj_id == PCH_FIFO_THRESH) {
- int cnt;
- for (cnt = 0; cnt < PCH_FIFO_THRESH; cnt++)
- pch_can_int_clr(priv, cnt + 1);
- }
-}
-
-static void pch_can_rx_msg_lost(struct net_device *ndev, int obj_id)
-{
- struct pch_can_priv *priv = netdev_priv(ndev);
- struct net_device_stats *stats = &(priv->ndev->stats);
- struct sk_buff *skb;
- struct can_frame *cf;
-
- netdev_dbg(priv->ndev, "Msg Obj is overwritten.\n");
- pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
- PCH_IF_MCONT_MSGLOST);
- iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL,
- &priv->regs->ifregs[0].cmask);
- pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, obj_id);
-
- skb = alloc_can_err_skb(ndev, &cf);
- if (!skb)
- return;
-
- cf->can_id |= CAN_ERR_CRTL;
- cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
- stats->rx_over_errors++;
- stats->rx_errors++;
-
- netif_receive_skb(skb);
-}
-
-static int pch_can_rx_normal(struct net_device *ndev, u32 obj_num, int quota)
-{
- u32 reg;
- canid_t id;
- int rcv_pkts = 0;
- struct sk_buff *skb;
- struct can_frame *cf;
- struct pch_can_priv *priv = netdev_priv(ndev);
- struct net_device_stats *stats = &(priv->ndev->stats);
- int i;
- u32 id2;
- u16 data_reg;
-
- do {
- /* Reading the message object from the Message RAM */
- iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask);
- pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, obj_num);
-
- /* Reading the MCONT register. */
- reg = ioread32(&priv->regs->ifregs[0].mcont);
-
- if (reg & PCH_IF_MCONT_EOB)
- break;
-
- /* If MsgLost bit set. */
- if (reg & PCH_IF_MCONT_MSGLOST) {
- pch_can_rx_msg_lost(ndev, obj_num);
- rcv_pkts++;
- quota--;
- obj_num++;
- continue;
- } else if (!(reg & PCH_IF_MCONT_NEWDAT)) {
- obj_num++;
- continue;
- }
-
- skb = alloc_can_skb(priv->ndev, &cf);
- if (!skb) {
- netdev_err(ndev, "alloc_can_skb Failed\n");
- return rcv_pkts;
- }
-
- /* Get Received data */
- id2 = ioread32(&priv->regs->ifregs[0].id2);
- if (id2 & PCH_ID2_XTD) {
- id = (ioread32(&priv->regs->ifregs[0].id1) & 0xffff);
- id |= (((id2) & 0x1fff) << 16);
- cf->can_id = id | CAN_EFF_FLAG;
- } else {
- id = (id2 >> 2) & CAN_SFF_MASK;
- cf->can_id = id;
- }
-
- cf->len = can_cc_dlc2len((ioread32(&priv->regs->
- ifregs[0].mcont)) & 0xF);
-
- if (id2 & PCH_ID2_DIR) {
- cf->can_id |= CAN_RTR_FLAG;
- } else {
- for (i = 0; i < cf->len; i += 2) {
- data_reg = ioread16(&priv->regs->ifregs[0].data[i / 2]);
- cf->data[i] = data_reg;
- cf->data[i + 1] = data_reg >> 8;
- }
-
- stats->rx_bytes += cf->len;
- }
- stats->rx_packets++;
- rcv_pkts++;
- quota--;
- netif_receive_skb(skb);
-
- pch_fifo_thresh(priv, obj_num);
- obj_num++;
- } while (quota > 0);
-
- return rcv_pkts;
-}
-
-static void pch_can_tx_complete(struct net_device *ndev, u32 int_stat)
-{
- struct pch_can_priv *priv = netdev_priv(ndev);
- struct net_device_stats *stats = &(priv->ndev->stats);
-
- stats->tx_bytes += can_get_echo_skb(ndev, int_stat - PCH_RX_OBJ_END - 1,
- NULL);
- stats->tx_packets++;
- iowrite32(PCH_CMASK_RX_TX_GET | PCH_CMASK_CLRINTPND,
- &priv->regs->ifregs[1].cmask);
- pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, int_stat);
- if (int_stat == PCH_TX_OBJ_END)
- netif_wake_queue(ndev);
-}
-
-static int pch_can_poll(struct napi_struct *napi, int quota)
-{
- struct net_device *ndev = napi->dev;
- struct pch_can_priv *priv = netdev_priv(ndev);
- u32 int_stat;
- u32 reg_stat;
- int quota_save = quota;
-
- int_stat = pch_can_int_pending(priv);
- if (!int_stat)
- goto end;
-
- if (int_stat == PCH_STATUS_INT) {
- reg_stat = ioread32(&priv->regs->stat);
-
- if ((reg_stat & (PCH_BUS_OFF | PCH_LEC_ALL)) &&
- ((reg_stat & PCH_LEC_ALL) != PCH_LEC_ALL)) {
- pch_can_error(ndev, reg_stat);
- quota--;
- }
-
- if (reg_stat & (PCH_TX_OK | PCH_RX_OK))
- pch_can_bit_clear(&priv->regs->stat,
- reg_stat & (PCH_TX_OK | PCH_RX_OK));
-
- int_stat = pch_can_int_pending(priv);
- }
-
- if (quota == 0)
- goto end;
-
- if ((int_stat >= PCH_RX_OBJ_START) && (int_stat <= PCH_RX_OBJ_END)) {
- quota -= pch_can_rx_normal(ndev, int_stat, quota);
- } else if ((int_stat >= PCH_TX_OBJ_START) &&
- (int_stat <= PCH_TX_OBJ_END)) {
- /* Handle transmission interrupt */
- pch_can_tx_complete(ndev, int_stat);
- }
-
-end:
- napi_complete(napi);
- pch_can_set_int_enables(priv, PCH_CAN_ALL);
-
- return quota_save - quota;
-}
-
-static int pch_set_bittiming(struct net_device *ndev)
-{
- struct pch_can_priv *priv = netdev_priv(ndev);
- const struct can_bittiming *bt = &priv->can.bittiming;
- u32 canbit;
- u32 bepe;
-
- /* Setting the CCE bit for accessing the Can Timing register. */
- pch_can_bit_set(&priv->regs->cont, PCH_CTRL_CCE);
-
- canbit = (bt->brp - 1) & PCH_MSK_BITT_BRP;
- canbit |= (bt->sjw - 1) << PCH_BIT_SJW_SHIFT;
- canbit |= (bt->phase_seg1 + bt->prop_seg - 1) << PCH_BIT_TSEG1_SHIFT;
- canbit |= (bt->phase_seg2 - 1) << PCH_BIT_TSEG2_SHIFT;
- bepe = ((bt->brp - 1) & PCH_MSK_BRPE_BRPE) >> PCH_BIT_BRPE_BRPE_SHIFT;
- iowrite32(canbit, &priv->regs->bitt);
- iowrite32(bepe, &priv->regs->brpe);
- pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_CCE);
-
- return 0;
-}
-
-static void pch_can_start(struct net_device *ndev)
-{
- struct pch_can_priv *priv = netdev_priv(ndev);
-
- if (priv->can.state != CAN_STATE_STOPPED)
- pch_can_reset(priv);
-
- pch_set_bittiming(ndev);
- pch_can_set_optmode(priv);
-
- pch_can_set_tx_all(priv, 1);
- pch_can_set_rx_all(priv, 1);
-
- /* Setting the CAN to run mode. */
- pch_can_set_run_mode(priv, PCH_CAN_RUN);
-
- priv->can.state = CAN_STATE_ERROR_ACTIVE;
-
- return;
-}
-
-static int pch_can_do_set_mode(struct net_device *ndev, enum can_mode mode)
-{
- int ret = 0;
-
- switch (mode) {
- case CAN_MODE_START:
- pch_can_start(ndev);
- netif_wake_queue(ndev);
- break;
- default:
- ret = -EOPNOTSUPP;
- break;
- }
-
- return ret;
-}
-
-static int pch_can_open(struct net_device *ndev)
-{
- struct pch_can_priv *priv = netdev_priv(ndev);
- int retval;
-
- /* Registering the interrupt. */
- retval = request_irq(priv->dev->irq, pch_can_interrupt, IRQF_SHARED,
- ndev->name, ndev);
- if (retval) {
- netdev_err(ndev, "request_irq failed.\n");
- goto req_irq_err;
- }
-
- /* Open common can device */
- retval = open_candev(ndev);
- if (retval) {
- netdev_err(ndev, "open_candev() failed %d\n", retval);
- goto err_open_candev;
- }
-
- pch_can_init(priv);
- pch_can_start(ndev);
- napi_enable(&priv->napi);
- netif_start_queue(ndev);
-
- return 0;
-
-err_open_candev:
- free_irq(priv->dev->irq, ndev);
-req_irq_err:
- pch_can_release(priv);
-
- return retval;
-}
-
-static int pch_close(struct net_device *ndev)
-{
- struct pch_can_priv *priv = netdev_priv(ndev);
-
- netif_stop_queue(ndev);
- napi_disable(&priv->napi);
- pch_can_release(priv);
- free_irq(priv->dev->irq, ndev);
- close_candev(ndev);
- priv->can.state = CAN_STATE_STOPPED;
- return 0;
-}
-
-static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev)
-{
- struct pch_can_priv *priv = netdev_priv(ndev);
- struct can_frame *cf = (struct can_frame *)skb->data;
- int tx_obj_no;
- int i;
- u32 id2;
-
- if (can_dropped_invalid_skb(ndev, skb))
- return NETDEV_TX_OK;
-
- tx_obj_no = priv->tx_obj;
- if (priv->tx_obj == PCH_TX_OBJ_END) {
- if (ioread32(&priv->regs->treq2) & PCH_TREQ2_TX_MASK)
- netif_stop_queue(ndev);
-
- priv->tx_obj = PCH_TX_OBJ_START;
- } else {
- priv->tx_obj++;
- }
-
- /* Setting the CMASK register. */
- pch_can_bit_set(&priv->regs->ifregs[1].cmask, PCH_CMASK_ALL);
-
- /* If ID extended is set. */
- if (cf->can_id & CAN_EFF_FLAG) {
- iowrite32(cf->can_id & 0xffff, &priv->regs->ifregs[1].id1);
- id2 = ((cf->can_id >> 16) & 0x1fff) | PCH_ID2_XTD;
- } else {
- iowrite32(0, &priv->regs->ifregs[1].id1);
- id2 = (cf->can_id & CAN_SFF_MASK) << 2;
- }
-
- id2 |= PCH_ID_MSGVAL;
-
- /* If remote frame has to be transmitted.. */
- if (!(cf->can_id & CAN_RTR_FLAG))
- id2 |= PCH_ID2_DIR;
-
- iowrite32(id2, &priv->regs->ifregs[1].id2);
-
- /* Copy data to register */
- for (i = 0; i < cf->len; i += 2) {
- iowrite16(cf->data[i] | (cf->data[i + 1] << 8),
- &priv->regs->ifregs[1].data[i / 2]);
- }
-
- can_put_echo_skb(skb, ndev, tx_obj_no - PCH_RX_OBJ_END - 1, 0);
-
- /* Set the size of the data. Update if2_mcont */
- iowrite32(cf->len | PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_TXRQXT |
- PCH_IF_MCONT_TXIE, &priv->regs->ifregs[1].mcont);
-
- pch_can_rw_msg_obj(&priv->regs->ifregs[1].creq, tx_obj_no);
-
- return NETDEV_TX_OK;
-}
-
-static const struct net_device_ops pch_can_netdev_ops = {
- .ndo_open = pch_can_open,
- .ndo_stop = pch_close,
- .ndo_start_xmit = pch_xmit,
- .ndo_change_mtu = can_change_mtu,
-};
-
-static const struct ethtool_ops pch_can_ethtool_ops = {
- .get_ts_info = ethtool_op_get_ts_info,
-};
-
-static void pch_can_remove(struct pci_dev *pdev)
-{
- struct net_device *ndev = pci_get_drvdata(pdev);
- struct pch_can_priv *priv = netdev_priv(ndev);
-
- unregister_candev(priv->ndev);
- if (priv->use_msi)
- pci_disable_msi(priv->dev);
- pci_release_regions(pdev);
- pci_disable_device(pdev);
- pch_can_reset(priv);
- pci_iounmap(pdev, priv->regs);
- free_candev(priv->ndev);
-}
-
-static void __maybe_unused pch_can_set_int_custom(struct pch_can_priv *priv)
-{
- /* Clearing the IE, SIE and EIE bits of Can control register. */
- pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_IE_SIE_EIE);
-
- /* Appropriately setting them. */
- pch_can_bit_set(&priv->regs->cont,
- ((priv->int_enables & PCH_MSK_CTRL_IE_SIE_EIE) << 1));
-}
-
-/* This function retrieves interrupt enabled for the CAN device. */
-static u32 __maybe_unused pch_can_get_int_enables(struct pch_can_priv *priv)
-{
- /* Obtaining the status of IE, SIE and EIE interrupt bits. */
- return (ioread32(&priv->regs->cont) & PCH_CTRL_IE_SIE_EIE) >> 1;
-}
-
-static u32 __maybe_unused pch_can_get_rxtx_ir(struct pch_can_priv *priv,
- u32 buff_num, enum pch_ifreg dir)
-{
- u32 ie, enable;
-
- if (dir)
- ie = PCH_IF_MCONT_RXIE;
- else
- ie = PCH_IF_MCONT_TXIE;
-
- iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[dir].cmask);
- pch_can_rw_msg_obj(&priv->regs->ifregs[dir].creq, buff_num);
-
- if (((ioread32(&priv->regs->ifregs[dir].id2)) & PCH_ID_MSGVAL) &&
- ((ioread32(&priv->regs->ifregs[dir].mcont)) & ie))
- enable = 1;
- else
- enable = 0;
-
- return enable;
-}
-
-static void __maybe_unused pch_can_set_rx_buffer_link(struct pch_can_priv *priv,
- u32 buffer_num, int set)
-{
- iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask);
- pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, buffer_num);
- iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL,
- &priv->regs->ifregs[0].cmask);
- if (set)
- pch_can_bit_clear(&priv->regs->ifregs[0].mcont,
- PCH_IF_MCONT_EOB);
- else
- pch_can_bit_set(&priv->regs->ifregs[0].mcont, PCH_IF_MCONT_EOB);
-
- pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, buffer_num);
-}
-
-static u32 __maybe_unused pch_can_get_rx_buffer_link(struct pch_can_priv *priv,
- u32 buffer_num)
-{
- u32 link;
-
- iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask);
- pch_can_rw_msg_obj(&priv->regs->ifregs[0].creq, buffer_num);
-
- if (ioread32(&priv->regs->ifregs[0].mcont) & PCH_IF_MCONT_EOB)
- link = 0;
- else
- link = 1;
- return link;
-}
-
-static int __maybe_unused pch_can_get_buffer_status(struct pch_can_priv *priv)
-{
- return (ioread32(&priv->regs->treq1) & 0xffff) |
- (ioread32(&priv->regs->treq2) << 16);
-}
-
-static int __maybe_unused pch_can_suspend(struct device *dev_d)
-{
- int i;
- u32 buf_stat; /* Variable for reading the transmit buffer status. */
- int counter = PCH_COUNTER_LIMIT;
-
- struct net_device *dev = dev_get_drvdata(dev_d);
- struct pch_can_priv *priv = netdev_priv(dev);
-
- /* Stop the CAN controller */
- pch_can_set_run_mode(priv, PCH_CAN_STOP);
-
- /* Indicate that we are aboutto/in suspend */
- priv->can.state = CAN_STATE_STOPPED;
-
- /* Waiting for all transmission to complete. */
- while (counter) {
- buf_stat = pch_can_get_buffer_status(priv);
- if (!buf_stat)
- break;
- counter--;
- udelay(1);
- }
- if (!counter)
- dev_err(dev_d, "%s -> Transmission time out.\n", __func__);
-
- /* Save interrupt configuration and then disable them */
- priv->int_enables = pch_can_get_int_enables(priv);
- pch_can_set_int_enables(priv, PCH_CAN_DISABLE);
-
- /* Save Tx buffer enable state */
- for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++)
- priv->tx_enable[i - 1] = pch_can_get_rxtx_ir(priv, i,
- PCH_TX_IFREG);
-
- /* Disable all Transmit buffers */
- pch_can_set_tx_all(priv, 0);
-
- /* Save Rx buffer enable state */
- for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) {
- priv->rx_enable[i - 1] = pch_can_get_rxtx_ir(priv, i,
- PCH_RX_IFREG);
- priv->rx_link[i - 1] = pch_can_get_rx_buffer_link(priv, i);
- }
-
- /* Disable all Receive buffers */
- pch_can_set_rx_all(priv, 0);
-
- return 0;
-}
-
-static int __maybe_unused pch_can_resume(struct device *dev_d)
-{
- int i;
- struct net_device *dev = dev_get_drvdata(dev_d);
- struct pch_can_priv *priv = netdev_priv(dev);
-
- priv->can.state = CAN_STATE_ERROR_ACTIVE;
-
- /* Disabling all interrupts. */
- pch_can_set_int_enables(priv, PCH_CAN_DISABLE);
-
- /* Setting the CAN device in Stop Mode. */
- pch_can_set_run_mode(priv, PCH_CAN_STOP);
-
- /* Configuring the transmit and receive buffers. */
- pch_can_config_rx_tx_buffers(priv);
-
- /* Restore the CAN state */
- pch_set_bittiming(dev);
-
- /* Listen/Active */
- pch_can_set_optmode(priv);
-
- /* Enabling the transmit buffer. */
- for (i = PCH_TX_OBJ_START; i <= PCH_TX_OBJ_END; i++)
- pch_can_set_rxtx(priv, i, priv->tx_enable[i - 1], PCH_TX_IFREG);
-
- /* Configuring the receive buffer and enabling them. */
- for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) {
- /* Restore buffer link */
- pch_can_set_rx_buffer_link(priv, i, priv->rx_link[i - 1]);
-
- /* Restore buffer enables */
- pch_can_set_rxtx(priv, i, priv->rx_enable[i - 1], PCH_RX_IFREG);
- }
-
- /* Enable CAN Interrupts */
- pch_can_set_int_custom(priv);
-
- /* Restore Run Mode */
- pch_can_set_run_mode(priv, PCH_CAN_RUN);
-
- return 0;
-}
-
-static int pch_can_get_berr_counter(const struct net_device *dev,
- struct can_berr_counter *bec)
-{
- struct pch_can_priv *priv = netdev_priv(dev);
- u32 errc = ioread32(&priv->regs->errc);
-
- bec->txerr = errc & PCH_TEC;
- bec->rxerr = (errc & PCH_REC) >> 8;
-
- return 0;
-}
-
-static int pch_can_probe(struct pci_dev *pdev,
- const struct pci_device_id *id)
-{
- struct net_device *ndev;
- struct pch_can_priv *priv;
- int rc;
- void __iomem *addr;
-
- rc = pci_enable_device(pdev);
- if (rc) {
- dev_err(&pdev->dev, "Failed pci_enable_device %d\n", rc);
- goto probe_exit_endev;
- }
-
- rc = pci_request_regions(pdev, KBUILD_MODNAME);
- if (rc) {
- dev_err(&pdev->dev, "Failed pci_request_regions %d\n", rc);
- goto probe_exit_pcireq;
- }
-
- addr = pci_iomap(pdev, 1, 0);
- if (!addr) {
- rc = -EIO;
- dev_err(&pdev->dev, "Failed pci_iomap\n");
- goto probe_exit_ipmap;
- }
-
- ndev = alloc_candev(sizeof(struct pch_can_priv), PCH_TX_OBJ_END);
- if (!ndev) {
- rc = -ENOMEM;
- dev_err(&pdev->dev, "Failed alloc_candev\n");
- goto probe_exit_alloc_candev;
- }
-
- priv = netdev_priv(ndev);
- priv->ndev = ndev;
- priv->regs = addr;
- priv->dev = pdev;
- priv->can.bittiming_const = &pch_can_bittiming_const;
- priv->can.do_set_mode = pch_can_do_set_mode;
- priv->can.do_get_berr_counter = pch_can_get_berr_counter;
- priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY |
- CAN_CTRLMODE_LOOPBACK;
- priv->tx_obj = PCH_TX_OBJ_START; /* Point head of Tx Obj */
-
- ndev->irq = pdev->irq;
- ndev->flags |= IFF_ECHO;
-
- pci_set_drvdata(pdev, ndev);
- SET_NETDEV_DEV(ndev, &pdev->dev);
- ndev->netdev_ops = &pch_can_netdev_ops;
- ndev->ethtool_ops = &pch_can_ethtool_ops;
- priv->can.clock.freq = PCH_CAN_CLK; /* Hz */
-
- netif_napi_add_weight(ndev, &priv->napi, pch_can_poll, PCH_RX_OBJ_END);
-
- rc = pci_enable_msi(priv->dev);
- if (rc) {
- netdev_err(ndev, "PCH CAN opened without MSI\n");
- priv->use_msi = 0;
- } else {
- netdev_err(ndev, "PCH CAN opened with MSI\n");
- pci_set_master(pdev);
- priv->use_msi = 1;
- }
-
- rc = register_candev(ndev);
- if (rc) {
- dev_err(&pdev->dev, "Failed register_candev %d\n", rc);
- goto probe_exit_reg_candev;
- }
-
- return 0;
-
-probe_exit_reg_candev:
- if (priv->use_msi)
- pci_disable_msi(priv->dev);
- free_candev(ndev);
-probe_exit_alloc_candev:
- pci_iounmap(pdev, addr);
-probe_exit_ipmap:
- pci_release_regions(pdev);
-probe_exit_pcireq:
- pci_disable_device(pdev);
-probe_exit_endev:
- return rc;
-}
-
-static SIMPLE_DEV_PM_OPS(pch_can_pm_ops,
- pch_can_suspend,
- pch_can_resume);
-
-static struct pci_driver pch_can_pci_driver = {
- .name = "pch_can",
- .id_table = pch_pci_tbl,
- .probe = pch_can_probe,
- .remove = pch_can_remove,
- .driver.pm = &pch_can_pm_ops,
-};
-
-module_pci_driver(pch_can_pci_driver);
-
-MODULE_DESCRIPTION("Intel EG20T PCH CAN(Controller Area Network) Driver");
-MODULE_LICENSE("GPL v2");
-MODULE_VERSION("0.94");
projects / linux-2.6-block.git / commitdiff