--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022 Davicom Semiconductor,Inc.
+ * Davicom DM9051 SPI Fast Ethernet Linux driver
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/irq.h>
+#include <linux/mii.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/phy.h>
+#include <linux/regmap.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/spi/spi.h>
+#include <linux/types.h>
+
+#include "dm9051.h"
+
+#define DRVNAME_9051 "dm9051"
+
+/**
+ * struct rx_ctl_mach - rx activities record
+ * @status_err_counter: rx status error counter
+ * @large_err_counter: rx get large packet length error counter
+ * @rx_err_counter: receive packet error counter
+ * @tx_err_counter: transmit packet error counter
+ * @fifo_rst_counter: reset operation counter
+ *
+ * To keep track for the driver operation statistics
+ */
+struct rx_ctl_mach {
+ u16 status_err_counter;
+ u16 large_err_counter;
+ u16 rx_err_counter;
+ u16 tx_err_counter;
+ u16 fifo_rst_counter;
+};
+
+/**
+ * struct dm9051_rxctrl - dm9051 driver rx control
+ * @hash_table: Multicast hash-table data
+ * @rcr_all: KS_RXCR1 register setting
+ *
+ * The settings needs to control the receive filtering
+ * such as the multicast hash-filter and the receive register settings
+ */
+struct dm9051_rxctrl {
+ u16 hash_table[4];
+ u8 rcr_all;
+};
+
+/**
+ * struct dm9051_rxhdr - rx packet data header
+ * @headbyte: lead byte equal to 0x01 notifies a valid packet
+ * @status: status bits for the received packet
+ * @rxlen: packet length
+ *
+ * The Rx packed, entered into the FIFO memory, start with these
+ * four bytes which is the Rx header, followed by the ethernet
+ * packet data and ends with an appended 4-byte CRC data.
+ * Both Rx packet and CRC data are for check purpose and finally
+ * are dropped by this driver
+ */
+struct dm9051_rxhdr {
+ u8 headbyte;
+ u8 status;
+ __le16 rxlen;
+};
+
+/**
+ * struct board_info - maintain the saved data
+ * @spidev: spi device structure
+ * @ndev: net device structure
+ * @mdiobus: mii bus structure
+ * @phydev: phy device structure
+ * @txq: tx queue structure
+ * @regmap_dm: regmap for register read/write
+ * @regmap_dmbulk: extra regmap for bulk read/write
+ * @rxctrl_work: Work queue for updating RX mode and multicast lists
+ * @tx_work: Work queue for tx packets
+ * @pause: ethtool pause parameter structure
+ * @spi_lockm: between threads lock structure
+ * @reg_mutex: regmap access lock structure
+ * @bc: rx control statistics structure
+ * @rxhdr: rx header structure
+ * @rctl: rx control setting structure
+ * @msg_enable: message level value
+ * @imr_all: to store operating imr value for register DM9051_IMR
+ * @lcr_all: to store operating rcr value for register DM9051_LMCR
+ *
+ * The saved data variables, keep up to date for retrieval back to use
+ */
+struct board_info {
+ u32 msg_enable;
+ struct spi_device *spidev;
+ struct net_device *ndev;
+ struct mii_bus *mdiobus;
+ struct phy_device *phydev;
+ struct sk_buff_head txq;
+ struct regmap *regmap_dm;
+ struct regmap *regmap_dmbulk;
+ struct work_struct rxctrl_work;
+ struct work_struct tx_work;
+ struct ethtool_pauseparam pause;
+ struct mutex spi_lockm;
+ struct mutex reg_mutex;
+ struct rx_ctl_mach bc;
+ struct dm9051_rxhdr rxhdr;
+ struct dm9051_rxctrl rctl;
+ u8 imr_all;
+ u8 lcr_all;
+};
+
+static int dm9051_set_reg(struct board_info *db, unsigned int reg, unsigned int val)
+{
+ int ret;
+
+ ret = regmap_write(db->regmap_dm, reg, val);
+ if (ret < 0)
+ netif_err(db, drv, db->ndev, "%s: error %d set reg %02x\n",
+ __func__, ret, reg);
+ return ret;
+}
+
+static int dm9051_update_bits(struct board_info *db, unsigned int reg, unsigned int mask,
+ unsigned int val)
+{
+ int ret;
+
+ ret = regmap_update_bits(db->regmap_dm, reg, mask, val);
+ if (ret < 0)
+ netif_err(db, drv, db->ndev, "%s: error %d update bits reg %02x\n",
+ __func__, ret, reg);
+ return ret;
+}
+
+/* skb buffer exhausted, just discard the received data
+ */
+static int dm9051_dumpblk(struct board_info *db, u8 reg, size_t count)
+{
+ struct net_device *ndev = db->ndev;
+ unsigned int rb;
+ int ret;
+
+ /* no skb buffer,
+ * both reg and &rb must be noinc,
+ * read once one byte via regmap_read
+ */
+ do {
+ ret = regmap_read(db->regmap_dm, reg, &rb);
+ if (ret < 0) {
+ netif_err(db, drv, ndev, "%s: error %d dumping read reg %02x\n",
+ __func__, ret, reg);
+ break;
+ }
+ } while (--count);
+
+ return ret;
+}
+
+static int dm9051_set_regs(struct board_info *db, unsigned int reg, const void *val,
+ size_t val_count)
+{
+ int ret;
+
+ ret = regmap_bulk_write(db->regmap_dmbulk, reg, val, val_count);
+ if (ret < 0)
+ netif_err(db, drv, db->ndev, "%s: error %d bulk writing regs %02x\n",
+ __func__, ret, reg);
+ return ret;
+}
+
+static int dm9051_get_regs(struct board_info *db, unsigned int reg, void *val,
+ size_t val_count)
+{
+ int ret;
+
+ ret = regmap_bulk_read(db->regmap_dmbulk, reg, val, val_count);
+ if (ret < 0)
+ netif_err(db, drv, db->ndev, "%s: error %d bulk reading regs %02x\n",
+ __func__, ret, reg);
+ return ret;
+}
+
+static int dm9051_write_mem(struct board_info *db, unsigned int reg, const void *buff,
+ size_t len)
+{
+ int ret;
+
+ ret = regmap_noinc_write(db->regmap_dm, reg, buff, len);
+ if (ret < 0)
+ netif_err(db, drv, db->ndev, "%s: error %d noinc writing regs %02x\n",
+ __func__, ret, reg);
+ return ret;
+}
+
+static int dm9051_read_mem(struct board_info *db, unsigned int reg, void *buff,
+ size_t len)
+{
+ int ret;
+
+ ret = regmap_noinc_read(db->regmap_dm, reg, buff, len);
+ if (ret < 0)
+ netif_err(db, drv, db->ndev, "%s: error %d noinc reading regs %02x\n",
+ __func__, ret, reg);
+ return ret;
+}
+
+/* waiting tx-end rather than tx-req
+ * got faster
+ */
+static int dm9051_nsr_poll(struct board_info *db)
+{
+ unsigned int mval;
+ int ret;
+
+ ret = regmap_read_poll_timeout(db->regmap_dm, DM9051_NSR, mval,
+ mval & (NSR_TX2END | NSR_TX1END), 1, 20);
+ if (ret == -ETIMEDOUT)
+ netdev_err(db->ndev, "timeout in checking for tx end\n");
+ return ret;
+}
+
+static int dm9051_epcr_poll(struct board_info *db)
+{
+ unsigned int mval;
+ int ret;
+
+ ret = regmap_read_poll_timeout(db->regmap_dm, DM9051_EPCR, mval,
+ !(mval & EPCR_ERRE), 100, 10000);
+ if (ret == -ETIMEDOUT)
+ netdev_err(db->ndev, "eeprom/phy in processing get timeout\n");
+ return ret;
+}
+
+static int dm9051_irq_flag(struct board_info *db)
+{
+ struct spi_device *spi = db->spidev;
+ int irq_type = irq_get_trigger_type(spi->irq);
+
+ if (irq_type)
+ return irq_type;
+
+ return IRQF_TRIGGER_LOW;
+}
+
+static unsigned int dm9051_intcr_value(struct board_info *db)
+{
+ return (dm9051_irq_flag(db) == IRQF_TRIGGER_LOW) ?
+ INTCR_POL_LOW : INTCR_POL_HIGH;
+}
+
+static int dm9051_set_fcr(struct board_info *db)
+{
+ u8 fcr = 0;
+
+ if (db->pause.rx_pause)
+ fcr |= FCR_BKPM | FCR_FLCE;
+ if (db->pause.tx_pause)
+ fcr |= FCR_TXPEN;
+
+ return dm9051_set_reg(db, DM9051_FCR, fcr);
+}
+
+static int dm9051_set_recv(struct board_info *db)
+{
+ int ret;
+
+ ret = dm9051_set_regs(db, DM9051_MAR, db->rctl.hash_table, sizeof(db->rctl.hash_table));
+ if (ret)
+ return ret;
+
+ return dm9051_set_reg(db, DM9051_RCR, db->rctl.rcr_all); /* enable rx */
+}
+
+static int dm9051_core_reset(struct board_info *db)
+{
+ int ret;
+
+ db->bc.fifo_rst_counter++;
+
+ ret = regmap_write(db->regmap_dm, DM9051_NCR, NCR_RST); /* NCR reset */
+ if (ret)
+ return ret;
+ ret = regmap_write(db->regmap_dm, DM9051_MBNDRY, MBNDRY_BYTE); /* MemBound */
+ if (ret)
+ return ret;
+ ret = regmap_write(db->regmap_dm, DM9051_PPCR, PPCR_PAUSE_COUNT); /* Pause Count */
+ if (ret)
+ return ret;
+ ret = regmap_write(db->regmap_dm, DM9051_LMCR, db->lcr_all); /* LEDMode1 */
+ if (ret)
+ return ret;
+
+ return dm9051_set_reg(db, DM9051_INTCR, dm9051_intcr_value(db));
+}
+
+static int dm9051_update_fcr(struct board_info *db)
+{
+ u8 fcr = 0;
+
+ if (db->pause.rx_pause)
+ fcr |= FCR_BKPM | FCR_FLCE;
+ if (db->pause.tx_pause)
+ fcr |= FCR_TXPEN;
+
+ return dm9051_update_bits(db, DM9051_FCR, FCR_RXTX_BITS, fcr);
+}
+
+static int dm9051_disable_interrupt(struct board_info *db)
+{
+ return dm9051_set_reg(db, DM9051_IMR, IMR_PAR); /* disable int */
+}
+
+static int dm9051_enable_interrupt(struct board_info *db)
+{
+ return dm9051_set_reg(db, DM9051_IMR, db->imr_all); /* enable int */
+}
+
+static int dm9051_stop_mrcmd(struct board_info *db)
+{
+ return dm9051_set_reg(db, DM9051_ISR, ISR_STOP_MRCMD); /* to stop mrcmd */
+}
+
+static int dm9051_clear_interrupt(struct board_info *db)
+{
+ return dm9051_update_bits(db, DM9051_ISR, ISR_CLR_INT, ISR_CLR_INT);
+}
+
+static int dm9051_eeprom_read(struct board_info *db, int offset, u8 *to)
+{
+ int ret;
+
+ ret = regmap_write(db->regmap_dm, DM9051_EPAR, offset);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(db->regmap_dm, DM9051_EPCR, EPCR_ERPRR);
+ if (ret)
+ return ret;
+
+ ret = dm9051_epcr_poll(db);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(db->regmap_dm, DM9051_EPCR, 0);
+ if (ret)
+ return ret;
+
+ return regmap_bulk_read(db->regmap_dmbulk, DM9051_EPDRL, to, 2);
+}
+
+static int dm9051_eeprom_write(struct board_info *db, int offset, u8 *data)
+{
+ int ret;
+
+ ret = regmap_write(db->regmap_dm, DM9051_EPAR, offset);
+ if (ret)
+ return ret;
+
+ ret = regmap_bulk_write(db->regmap_dmbulk, DM9051_EPDRL, data, 2);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write(db->regmap_dm, DM9051_EPCR, EPCR_WEP | EPCR_ERPRW);
+ if (ret)
+ return ret;
+
+ ret = dm9051_epcr_poll(db);
+ if (ret)
+ return ret;
+
+ return regmap_write(db->regmap_dm, DM9051_EPCR, 0);
+}
+
+static int dm9051_phyread(void *context, unsigned int reg, unsigned int *val)
+{
+ struct board_info *db = context;
+ int ret;
+
+ ret = regmap_write(db->regmap_dm, DM9051_EPAR, DM9051_PHY | reg);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(db->regmap_dm, DM9051_EPCR, EPCR_ERPRR | EPCR_EPOS);
+ if (ret)
+ return ret;
+
+ ret = dm9051_epcr_poll(db);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(db->regmap_dm, DM9051_EPCR, 0);
+ if (ret)
+ return ret;
+
+ /* this is a 4 bytes data, clear to zero since following regmap_bulk_read
+ * only fill lower 2 bytes
+ */
+ *val = 0;
+ return regmap_bulk_read(db->regmap_dmbulk, DM9051_EPDRL, val, 2);
+}
+
+static int dm9051_phywrite(void *context, unsigned int reg, unsigned int val)
+{
+ struct board_info *db = context;
+ int ret;
+
+ ret = regmap_write(db->regmap_dm, DM9051_EPAR, DM9051_PHY | reg);
+ if (ret)
+ return ret;
+
+ ret = regmap_bulk_write(db->regmap_dmbulk, DM9051_EPDRL, &val, 2);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write(db->regmap_dm, DM9051_EPCR, EPCR_EPOS | EPCR_ERPRW);
+ if (ret)
+ return ret;
+
+ ret = dm9051_epcr_poll(db);
+ if (ret)
+ return ret;
+
+ return regmap_write(db->regmap_dm, DM9051_EPCR, 0);
+}
+
+static int dm9051_mdio_read(struct mii_bus *bus, int addr, int regnum)
+{
+ struct board_info *db = bus->priv;
+ unsigned int val = 0xffff;
+ int ret;
+
+ if (addr == DM9051_PHY_ADDR) {
+ ret = dm9051_phyread(db, regnum, &val);
+ if (ret)
+ return ret;
+ }
+
+ return val;
+}
+
+static int dm9051_mdio_write(struct mii_bus *bus, int addr, int regnum, u16 val)
+{
+ struct board_info *db = bus->priv;
+
+ if (addr == DM9051_PHY_ADDR)
+ return dm9051_phywrite(db, regnum, val);
+
+ return -ENODEV;
+}
+
+static void dm9051_reg_lock_mutex(void *dbcontext)
+{
+ struct board_info *db = dbcontext;
+
+ mutex_lock(&db->reg_mutex);
+}
+
+static void dm9051_reg_unlock_mutex(void *dbcontext)
+{
+ struct board_info *db = dbcontext;
+
+ mutex_unlock(&db->reg_mutex);
+}
+
+static struct regmap_config regconfigdm = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0xff,
+ .reg_stride = 1,
+ .cache_type = REGCACHE_NONE,
+ .read_flag_mask = 0,
+ .write_flag_mask = DM_SPI_WR,
+ .val_format_endian = REGMAP_ENDIAN_LITTLE,
+ .lock = dm9051_reg_lock_mutex,
+ .unlock = dm9051_reg_unlock_mutex,
+};
+
+static struct regmap_config regconfigdmbulk = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0xff,
+ .reg_stride = 1,
+ .cache_type = REGCACHE_NONE,
+ .read_flag_mask = 0,
+ .write_flag_mask = DM_SPI_WR,
+ .val_format_endian = REGMAP_ENDIAN_LITTLE,
+ .lock = dm9051_reg_lock_mutex,
+ .unlock = dm9051_reg_unlock_mutex,
+ .use_single_read = true,
+ .use_single_write = true,
+};
+
+static int dm9051_map_init(struct spi_device *spi, struct board_info *db)
+{
+ /* create two regmap instances,
+ * split read/write and bulk_read/bulk_write to individual regmap
+ * to resolve regmap execution confliction problem
+ */
+ regconfigdm.lock_arg = db;
+ db->regmap_dm = devm_regmap_init_spi(db->spidev, ®configdm);
+ if (IS_ERR(db->regmap_dm))
+ return PTR_ERR(db->regmap_dm);
+
+ regconfigdmbulk.lock_arg = db;
+ db->regmap_dmbulk = devm_regmap_init_spi(db->spidev, ®configdmbulk);
+ if (IS_ERR(db->regmap_dmbulk))
+ return PTR_ERR(db->regmap_dmbulk);
+
+ return 0;
+}
+
+static int dm9051_map_chipid(struct board_info *db)
+{
+ struct device *dev = &db->spidev->dev;
+ unsigned int ret;
+ unsigned short wid;
+ u8 buff[6];
+
+ ret = dm9051_get_regs(db, DM9051_VIDL, buff, sizeof(buff));
+ if (ret < 0)
+ return ret;
+
+ wid = get_unaligned_le16(buff + 2);
+ if (wid != DM9051_ID) {
+ dev_err(dev, "chipid error as %04x !\n", wid);
+ return -ENODEV;
+ }
+
+ dev_info(dev, "chip %04x found\n", wid);
+ return 0;
+}
+
+/* Read DM9051_PAR registers which is the mac address loaded from EEPROM while power-on
+ */
+static int dm9051_map_etherdev_par(struct net_device *ndev, struct board_info *db)
+{
+ u8 addr[ETH_ALEN];
+ int ret;
+
+ ret = dm9051_get_regs(db, DM9051_PAR, addr, sizeof(addr));
+ if (ret < 0)
+ return ret;
+
+ if (!is_valid_ether_addr(addr)) {
+ eth_hw_addr_random(ndev);
+
+ ret = dm9051_set_regs(db, DM9051_PAR, ndev->dev_addr, sizeof(ndev->dev_addr));
+ if (ret < 0)
+ return ret;
+
+ dev_dbg(&db->spidev->dev, "Use random MAC address\n");
+ return 0;
+ }
+
+ eth_hw_addr_set(ndev, addr);
+ return 0;
+}
+
+/* ethtool-ops
+ */
+static void dm9051_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
+{
+ strscpy(info->driver, DRVNAME_9051, sizeof(info->driver));
+}
+
+static void dm9051_set_msglevel(struct net_device *ndev, u32 value)
+{
+ struct board_info *db = to_dm9051_board(ndev);
+
+ db->msg_enable = value;
+}
+
+static u32 dm9051_get_msglevel(struct net_device *ndev)
+{
+ struct board_info *db = to_dm9051_board(ndev);
+
+ return db->msg_enable;
+}
+
+static int dm9051_get_eeprom_len(struct net_device *dev)
+{
+ return 128;
+}
+
+static int dm9051_get_eeprom(struct net_device *ndev,
+ struct ethtool_eeprom *ee, u8 *data)
+{
+ struct board_info *db = to_dm9051_board(ndev);
+ int offset = ee->offset;
+ int len = ee->len;
+ int i, ret;
+
+ if ((len | offset) & 1)
+ return -EINVAL;
+
+ ee->magic = DM_EEPROM_MAGIC;
+
+ for (i = 0; i < len; i += 2) {
+ ret = dm9051_eeprom_read(db, (offset + i) / 2, data + i);
+ if (ret)
+ break;
+ }
+ return ret;
+}
+
+static int dm9051_set_eeprom(struct net_device *ndev,
+ struct ethtool_eeprom *ee, u8 *data)
+{
+ struct board_info *db = to_dm9051_board(ndev);
+ int offset = ee->offset;
+ int len = ee->len;
+ int i, ret;
+
+ if ((len | offset) & 1)
+ return -EINVAL;
+
+ if (ee->magic != DM_EEPROM_MAGIC)
+ return -EINVAL;
+
+ for (i = 0; i < len; i += 2) {
+ ret = dm9051_eeprom_write(db, (offset + i) / 2, data + i);
+ if (ret)
+ break;
+ }
+ return ret;
+}
+
+static void dm9051_get_pauseparam(struct net_device *ndev,
+ struct ethtool_pauseparam *pause)
+{
+ struct board_info *db = to_dm9051_board(ndev);
+
+ *pause = db->pause;
+}
+
+static int dm9051_set_pauseparam(struct net_device *ndev,
+ struct ethtool_pauseparam *pause)
+{
+ struct board_info *db = to_dm9051_board(ndev);
+
+ db->pause = *pause;
+
+ if (pause->autoneg == AUTONEG_DISABLE)
+ return dm9051_update_fcr(db);
+
+ phy_set_sym_pause(db->phydev, pause->rx_pause, pause->tx_pause,
+ pause->autoneg);
+ phy_start_aneg(db->phydev);
+ return 0;
+}
+
+static const struct ethtool_ops dm9051_ethtool_ops = {
+ .get_drvinfo = dm9051_get_drvinfo,
+ .get_link_ksettings = phy_ethtool_get_link_ksettings,
+ .set_link_ksettings = phy_ethtool_set_link_ksettings,
+ .get_msglevel = dm9051_get_msglevel,
+ .set_msglevel = dm9051_set_msglevel,
+ .nway_reset = phy_ethtool_nway_reset,
+ .get_link = ethtool_op_get_link,
+ .get_eeprom_len = dm9051_get_eeprom_len,
+ .get_eeprom = dm9051_get_eeprom,
+ .set_eeprom = dm9051_set_eeprom,
+ .get_pauseparam = dm9051_get_pauseparam,
+ .set_pauseparam = dm9051_set_pauseparam,
+};
+
+static int dm9051_all_start(struct board_info *db)
+{
+ int ret;
+
+ /* GPR power on of the internal phy
+ */
+ ret = dm9051_set_reg(db, DM9051_GPR, 0);
+ if (ret)
+ return ret;
+
+ /* dm9051 chip registers could not be accessed within 1 ms
+ * after GPR power on, delay 1 ms is essential
+ */
+ msleep(1);
+
+ ret = dm9051_core_reset(db);
+ if (ret)
+ return ret;
+
+ return dm9051_enable_interrupt(db);
+}
+
+static int dm9051_all_stop(struct board_info *db)
+{
+ int ret;
+
+ /* GPR power off of the internal phy,
+ * The internal phy still could be accessed after this GPR power off control
+ */
+ ret = dm9051_set_reg(db, DM9051_GPR, GPR_PHY_OFF);
+ if (ret)
+ return ret;
+
+ return dm9051_set_reg(db, DM9051_RCR, RCR_RX_DISABLE);
+}
+
+/* fifo reset while rx error found
+ */
+static int dm9051_all_restart(struct board_info *db)
+{
+ struct net_device *ndev = db->ndev;
+ int ret;
+
+ ret = dm9051_core_reset(db);
+ if (ret)
+ return ret;
+
+ ret = dm9051_enable_interrupt(db);
+ if (ret)
+ return ret;
+
+ netdev_dbg(ndev, " rxstatus_Er & rxlen_Er %d, RST_c %d\n",
+ db->bc.status_err_counter + db->bc.large_err_counter,
+ db->bc.fifo_rst_counter);
+
+ ret = dm9051_set_recv(db);
+ if (ret)
+ return ret;
+
+ return dm9051_set_fcr(db);
+}
+
+/* read packets from the fifo memory
+ * return value,
+ * > 0 - read packet number, caller can repeat the rx operation
+ * 0 - no error, caller need stop further rx operation
+ * -EBUSY - read data error, caller escape from rx operation
+ */
+static int dm9051_loop_rx(struct board_info *db)
+{
+ struct net_device *ndev = db->ndev;
+ unsigned int rxbyte;
+ int ret, rxlen;
+ struct sk_buff *skb;
+ u8 *rdptr;
+ int scanrr = 0;
+
+ do {
+ ret = dm9051_read_mem(db, DM_SPI_MRCMDX, &rxbyte, 2);
+ if (ret)
+ return ret;
+
+ if ((rxbyte & GENMASK(7, 0)) != DM9051_PKT_RDY)
+ break; /* exhaust-empty */
+
+ ret = dm9051_read_mem(db, DM_SPI_MRCMD, &db->rxhdr, DM_RXHDR_SIZE);
+ if (ret)
+ return ret;
+
+ ret = dm9051_stop_mrcmd(db);
+ if (ret)
+ return ret;
+
+ rxlen = le16_to_cpu(db->rxhdr.rxlen);
+ if (db->rxhdr.status & RSR_ERR_BITS || rxlen > DM9051_PKT_MAX) {
+ netdev_dbg(ndev, "rxhdr-byte (%02x)\n",
+ db->rxhdr.headbyte);
+
+ if (db->rxhdr.status & RSR_ERR_BITS) {
+ db->bc.status_err_counter++;
+ netdev_dbg(ndev, "check rxstatus-eror (%02x)\n",
+ db->rxhdr.status);
+ } else {
+ db->bc.large_err_counter++;
+ netdev_dbg(ndev, "check rxlen large-eror (%d > %d)\n",
+ rxlen, DM9051_PKT_MAX);
+ }
+ return dm9051_all_restart(db);
+ }
+
+ skb = dev_alloc_skb(rxlen);
+ if (!skb) {
+ ret = dm9051_dumpblk(db, DM_SPI_MRCMD, rxlen);
+ if (ret)
+ return ret;
+ return scanrr;
+ }
+
+ rdptr = skb_put(skb, rxlen - 4);
+ ret = dm9051_read_mem(db, DM_SPI_MRCMD, rdptr, rxlen);
+ if (ret) {
+ db->bc.rx_err_counter++;
+ dev_kfree_skb(skb);
+ return ret;
+ }
+
+ ret = dm9051_stop_mrcmd(db);
+ if (ret)
+ return ret;
+
+ skb->protocol = eth_type_trans(skb, db->ndev);
+ if (db->ndev->features & NETIF_F_RXCSUM)
+ skb_checksum_none_assert(skb);
+ netif_rx_ni(skb);
+ db->ndev->stats.rx_bytes += rxlen;
+ db->ndev->stats.rx_packets++;
+ scanrr++;
+ } while (!ret);
+
+ return scanrr;
+}
+
+/* transmit a packet,
+ * return value,
+ * 0 - succeed
+ * -ETIMEDOUT - timeout error
+ */
+static int dm9051_single_tx(struct board_info *db, u8 *buff, unsigned int len)
+{
+ int ret;
+
+ ret = dm9051_nsr_poll(db);
+ if (ret)
+ return ret;
+
+ ret = dm9051_write_mem(db, DM_SPI_MWCMD, buff, len);
+ if (ret)
+ return ret;
+
+ ret = dm9051_set_regs(db, DM9051_TXPLL, &len, 2);
+ if (ret < 0)
+ return ret;
+
+ return dm9051_set_reg(db, DM9051_TCR, TCR_TXREQ);
+}
+
+static int dm9051_loop_tx(struct board_info *db)
+{
+ struct net_device *ndev = db->ndev;
+ int ntx = 0;
+ int ret;
+
+ while (!skb_queue_empty(&db->txq)) {
+ struct sk_buff *skb;
+
+ skb = skb_dequeue(&db->txq);
+ if (skb) {
+ ntx++;
+ ret = dm9051_single_tx(db, skb->data, skb->len);
+ dev_kfree_skb(skb);
+ if (ret < 0) {
+ db->bc.tx_err_counter++;
+ return 0;
+ }
+ ndev->stats.tx_bytes += skb->len;
+ ndev->stats.tx_packets++;
+ }
+
+ if (netif_queue_stopped(ndev) &&
+ (skb_queue_len(&db->txq) < DM9051_TX_QUE_LO_WATER))
+ netif_wake_queue(ndev);
+ }
+
+ return ntx;
+}
+
+static irqreturn_t dm9051_rx_threaded_irq(int irq, void *pw)
+{
+ struct board_info *db = pw;
+ int result, result_tx;
+
+ mutex_lock(&db->spi_lockm);
+
+ result = dm9051_disable_interrupt(db);
+ if (result)
+ goto out_unlock;
+
+ result = dm9051_clear_interrupt(db);
+ if (result)
+ goto out_unlock;
+
+ do {
+ result = dm9051_loop_rx(db); /* threaded irq rx */
+ if (result < 0)
+ goto out_unlock;
+ result_tx = dm9051_loop_tx(db); /* more tx better performance */
+ if (result_tx < 0)
+ goto out_unlock;
+ } while (result > 0);
+
+ dm9051_enable_interrupt(db);
+
+ /* To exit and has mutex unlock while rx or tx error
+ */
+out_unlock:
+ mutex_unlock(&db->spi_lockm);
+
+ return IRQ_HANDLED;
+}
+
+static void dm9051_tx_delay(struct work_struct *work)
+{
+ struct board_info *db = container_of(work, struct board_info, tx_work);
+ int result;
+
+ mutex_lock(&db->spi_lockm);
+
+ result = dm9051_loop_tx(db);
+ if (result < 0)
+ netdev_err(db->ndev, "transmit packet error\n");
+
+ mutex_unlock(&db->spi_lockm);
+}
+
+static void dm9051_rxctl_delay(struct work_struct *work)
+{
+ struct board_info *db = container_of(work, struct board_info, rxctrl_work);
+ struct net_device *ndev = db->ndev;
+ int result;
+
+ mutex_lock(&db->spi_lockm);
+
+ result = dm9051_set_regs(db, DM9051_PAR, ndev->dev_addr, sizeof(ndev->dev_addr));
+ if (result < 0)
+ goto out_unlock;
+
+ dm9051_set_recv(db);
+
+ /* To has mutex unlock and return from this function if regmap function fail
+ */
+out_unlock:
+ mutex_unlock(&db->spi_lockm);
+}
+
+/* Open network device
+ * Called when the network device is marked active, such as a user executing
+ * 'ifconfig up' on the device
+ */
+static int dm9051_open(struct net_device *ndev)
+{
+ struct board_info *db = to_dm9051_board(ndev);
+ struct spi_device *spi = db->spidev;
+ int ret;
+
+ db->imr_all = IMR_PAR | IMR_PRM;
+ db->lcr_all = LMCR_MODE1;
+ db->rctl.rcr_all = RCR_DIS_LONG | RCR_DIS_CRC | RCR_RXEN;
+ memset(db->rctl.hash_table, 0, sizeof(db->rctl.hash_table));
+
+ ndev->irq = spi->irq; /* by dts */
+ ret = request_threaded_irq(spi->irq, NULL, dm9051_rx_threaded_irq,
+ dm9051_irq_flag(db) | IRQF_ONESHOT,
+ ndev->name, db);
+ if (ret < 0) {
+ netdev_err(ndev, "failed to get irq\n");
+ return ret;
+ }
+
+ phy_support_sym_pause(db->phydev);
+ phy_start(db->phydev);
+
+ /* flow control parameters init */
+ db->pause.rx_pause = true;
+ db->pause.tx_pause = true;
+ db->pause.autoneg = AUTONEG_DISABLE;
+
+ if (db->phydev->autoneg)
+ db->pause.autoneg = AUTONEG_ENABLE;
+
+ ret = dm9051_all_start(db);
+ if (ret) {
+ phy_stop(db->phydev);
+ free_irq(spi->irq, db);
+ return ret;
+ }
+
+ netif_wake_queue(ndev);
+
+ return 0;
+}
+
+/* Close network device
+ * Called to close down a network device which has been active. Cancel any
+ * work, shutdown the RX and TX process and then place the chip into a low
+ * power state while it is not being used
+ */
+static int dm9051_stop(struct net_device *ndev)
+{
+ struct board_info *db = to_dm9051_board(ndev);
+ int ret;
+
+ ret = dm9051_all_stop(db);
+ if (ret)
+ return ret;
+
+ flush_work(&db->tx_work);
+ flush_work(&db->rxctrl_work);
+
+ phy_stop(db->phydev);
+
+ free_irq(db->spidev->irq, db);
+
+ netif_stop_queue(ndev);
+
+ skb_queue_purge(&db->txq);
+
+ return 0;
+}
+
+/* event: play a schedule starter in condition
+ */
+static netdev_tx_t dm9051_start_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+ struct board_info *db = to_dm9051_board(ndev);
+
+ skb_queue_tail(&db->txq, skb);
+ if (skb_queue_len(&db->txq) > DM9051_TX_QUE_HI_WATER)
+ netif_stop_queue(ndev); /* enforce limit queue size */
+
+ schedule_work(&db->tx_work);
+
+ return NETDEV_TX_OK;
+}
+
+/* event: play with a schedule starter
+ */
+static void dm9051_set_rx_mode(struct net_device *ndev)
+{
+ struct board_info *db = to_dm9051_board(ndev);
+ struct dm9051_rxctrl rxctrl;
+ struct netdev_hw_addr *ha;
+ u8 rcr = RCR_DIS_LONG | RCR_DIS_CRC | RCR_RXEN;
+ u32 hash_val;
+
+ memset(&rxctrl, 0, sizeof(rxctrl));
+
+ /* rx control */
+ if (ndev->flags & IFF_PROMISC) {
+ rcr |= RCR_PRMSC;
+ netdev_dbg(ndev, "set_multicast rcr |= RCR_PRMSC, rcr= %02x\n", rcr);
+ }
+
+ if (ndev->flags & IFF_ALLMULTI) {
+ rcr |= RCR_ALL;
+ netdev_dbg(ndev, "set_multicast rcr |= RCR_ALLMULTI, rcr= %02x\n", rcr);
+ }
+
+ rxctrl.rcr_all = rcr;
+
+ /* broadcast address */
+ rxctrl.hash_table[0] = 0;
+ rxctrl.hash_table[1] = 0;
+ rxctrl.hash_table[2] = 0;
+ rxctrl.hash_table[3] = 0x8000;
+
+ /* the multicast address in Hash Table : 64 bits */
+ netdev_for_each_mc_addr(ha, ndev) {
+ hash_val = ether_crc_le(ETH_ALEN, ha->addr) & GENMASK(5, 0);
+ rxctrl.hash_table[hash_val / 16] |= BIT(0) << (hash_val % 16);
+ }
+
+ /* schedule work to do the actual set of the data if needed */
+
+ if (memcmp(&db->rctl, &rxctrl, sizeof(rxctrl))) {
+ memcpy(&db->rctl, &rxctrl, sizeof(rxctrl));
+ schedule_work(&db->rxctrl_work);
+ }
+}
+
+/* event: write into the mac registers and eeprom directly
+ */
+static int dm9051_set_mac_address(struct net_device *ndev, void *p)
+{
+ struct board_info *db = to_dm9051_board(ndev);
+ int ret;
+
+ ret = eth_prepare_mac_addr_change(ndev, p);
+ if (ret < 0)
+ return ret;
+
+ eth_commit_mac_addr_change(ndev, p);
+ return dm9051_set_regs(db, DM9051_PAR, ndev->dev_addr, sizeof(ndev->dev_addr));
+}
+
+static const struct net_device_ops dm9051_netdev_ops = {
+ .ndo_open = dm9051_open,
+ .ndo_stop = dm9051_stop,
+ .ndo_start_xmit = dm9051_start_xmit,
+ .ndo_set_rx_mode = dm9051_set_rx_mode,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_set_mac_address = dm9051_set_mac_address,
+};
+
+static void dm9051_operation_clear(struct board_info *db)
+{
+ db->bc.status_err_counter = 0;
+ db->bc.large_err_counter = 0;
+ db->bc.rx_err_counter = 0;
+ db->bc.tx_err_counter = 0;
+ db->bc.fifo_rst_counter = 0;
+}
+
+static int dm9051_mdio_register(struct board_info *db)
+{
+ struct spi_device *spi = db->spidev;
+ int ret;
+
+ db->mdiobus = devm_mdiobus_alloc(&spi->dev);
+ if (!db->mdiobus)
+ return -ENOMEM;
+
+ db->mdiobus->priv = db;
+ db->mdiobus->read = dm9051_mdio_read;
+ db->mdiobus->write = dm9051_mdio_write;
+ db->mdiobus->name = "dm9051-mdiobus";
+ db->mdiobus->phy_mask = (u32)~BIT(1);
+ db->mdiobus->parent = &spi->dev;
+ snprintf(db->mdiobus->id, MII_BUS_ID_SIZE,
+ "dm9051-%s.%u", dev_name(&spi->dev), spi->chip_select);
+
+ ret = devm_mdiobus_register(&spi->dev, db->mdiobus);
+ if (ret)
+ dev_err(&spi->dev, "Could not register MDIO bus\n");
+
+ return ret;
+}
+
+static void dm9051_handle_link_change(struct net_device *ndev)
+{
+ struct board_info *db = to_dm9051_board(ndev);
+
+ phy_print_status(db->phydev);
+
+ /* only write pause settings to mac. since mac and phy are integrated
+ * together, such as link state, speed and duplex are sync already
+ */
+ if (db->phydev->link) {
+ if (db->phydev->pause) {
+ db->pause.rx_pause = true;
+ db->pause.tx_pause = true;
+ }
+ dm9051_update_fcr(db);
+ }
+}
+
+/* phy connect as poll mode
+ */
+static int dm9051_phy_connect(struct board_info *db)
+{
+ char phy_id[MII_BUS_ID_SIZE + 3];
+
+ snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT,
+ db->mdiobus->id, DM9051_PHY_ADDR);
+
+ db->phydev = phy_connect(db->ndev, phy_id, dm9051_handle_link_change,
+ PHY_INTERFACE_MODE_MII);
+ if (IS_ERR(db->phydev))
+ return PTR_ERR_OR_ZERO(db->phydev);
+ return 0;
+}
+
+static int dm9051_probe(struct spi_device *spi)
+{
+ struct device *dev = &spi->dev;
+ struct net_device *ndev;
+ struct board_info *db;
+ int ret;
+
+ ndev = devm_alloc_etherdev(dev, sizeof(struct board_info));
+ if (!ndev)
+ return -ENOMEM;
+
+ SET_NETDEV_DEV(ndev, dev);
+ dev_set_drvdata(dev, ndev);
+
+ db = netdev_priv(ndev);
+
+ db->msg_enable = 0;
+ db->spidev = spi;
+ db->ndev = ndev;
+
+ ndev->netdev_ops = &dm9051_netdev_ops;
+ ndev->ethtool_ops = &dm9051_ethtool_ops;
+
+ mutex_init(&db->spi_lockm);
+ mutex_init(&db->reg_mutex);
+
+ INIT_WORK(&db->rxctrl_work, dm9051_rxctl_delay);
+ INIT_WORK(&db->tx_work, dm9051_tx_delay);
+
+ ret = dm9051_map_init(spi, db);
+ if (ret)
+ return ret;
+
+ ret = dm9051_map_chipid(db);
+ if (ret)
+ return ret;
+
+ ret = dm9051_map_etherdev_par(ndev, db);
+ if (ret < 0)
+ return ret;
+
+ ret = dm9051_mdio_register(db);
+ if (ret)
+ return ret;
+
+ ret = dm9051_phy_connect(db);
+ if (ret)
+ return ret;
+
+ dm9051_operation_clear(db);
+ skb_queue_head_init(&db->txq);
+
+ ret = devm_register_netdev(dev, ndev);
+ if (ret) {
+ phy_disconnect(db->phydev);
+ return dev_err_probe(dev, ret, "device register failed");
+ }
+
+ return 0;
+}
+
+static int dm9051_drv_remove(struct spi_device *spi)
+{
+ struct device *dev = &spi->dev;
+ struct net_device *ndev = dev_get_drvdata(dev);
+ struct board_info *db = to_dm9051_board(ndev);
+
+ phy_disconnect(db->phydev);
+
+ return 0;
+}
+
+static const struct of_device_id dm9051_match_table[] = {
+ { .compatible = "davicom,dm9051" },
+ {}
+};
+
+static const struct spi_device_id dm9051_id_table[] = {
+ { "dm9051", 0 },
+ {}
+};
+
+static struct spi_driver dm9051_driver = {
+ .driver = {
+ .name = DRVNAME_9051,
+ .of_match_table = dm9051_match_table,
+ },
+ .probe = dm9051_probe,
+ .remove = dm9051_drv_remove,
+ .id_table = dm9051_id_table,
+};
+module_spi_driver(dm9051_driver);
+
+MODULE_AUTHOR("Joseph CHANG <joseph_chang@davicom.com.tw>");
+MODULE_DESCRIPTION("Davicom DM9051 network SPI driver");
+MODULE_LICENSE("GPL");
projects / linux-block.git / commitdiff