diff options
Diffstat (limited to 'drivers/net/ethernet/microchip/enc28j60.c')
| -rw-r--r-- | drivers/net/ethernet/microchip/enc28j60.c | 1650 |
1 files changed, 1650 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/enc28j60.c b/drivers/net/ethernet/microchip/enc28j60.c new file mode 100644 index 000000000..09cdc2f2e --- /dev/null +++ b/drivers/net/ethernet/microchip/enc28j60.c @@ -0,0 +1,1650 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Microchip ENC28J60 ethernet driver (MAC + PHY) + * + * Copyright (C) 2007 Eurek srl + * Author: Claudio Lanconelli <lanconelli.claudio@eptar.com> + * based on enc28j60.c written by David Anders for 2.4 kernel version + * + * $Id: enc28j60.c,v 1.22 2007/12/20 10:47:01 claudio Exp $ + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/fcntl.h> +#include <linux/interrupt.h> +#include <linux/property.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/ethtool.h> +#include <linux/tcp.h> +#include <linux/skbuff.h> +#include <linux/delay.h> +#include <linux/spi/spi.h> + +#include "enc28j60_hw.h" + +#define DRV_NAME "enc28j60" +#define DRV_VERSION "1.02" + +#define SPI_OPLEN 1 + +#define ENC28J60_MSG_DEFAULT \ + (NETIF_MSG_PROBE | NETIF_MSG_IFUP | NETIF_MSG_IFDOWN | NETIF_MSG_LINK) + +/* Buffer size required for the largest SPI transfer (i.e., reading a + * frame). + */ +#define SPI_TRANSFER_BUF_LEN (4 + MAX_FRAMELEN) + +#define TX_TIMEOUT (4 * HZ) + +/* Max TX retries in case of collision as suggested by errata datasheet */ +#define MAX_TX_RETRYCOUNT 16 + +enum { + RXFILTER_NORMAL, + RXFILTER_MULTI, + RXFILTER_PROMISC +}; + +/* Driver local data */ +struct enc28j60_net { + struct net_device *netdev; + struct spi_device *spi; + struct mutex lock; + struct sk_buff *tx_skb; + struct work_struct tx_work; + struct work_struct irq_work; + struct work_struct setrx_work; + struct work_struct restart_work; + u8 bank; /* current register bank selected */ + u16 next_pk_ptr; /* next packet pointer within FIFO */ + u16 max_pk_counter; /* statistics: max packet counter */ + u16 tx_retry_count; + bool hw_enable; + bool full_duplex; + int rxfilter; + u32 msg_enable; + u8 spi_transfer_buf[SPI_TRANSFER_BUF_LEN]; +}; + +/* use ethtool to change the level for any given device */ +static struct { + u32 msg_enable; +} debug = { -1 }; + +/* + * SPI read buffer + * Wait for the SPI transfer and copy received data to destination. + */ +static int +spi_read_buf(struct enc28j60_net *priv, int len, u8 *data) +{ + struct device *dev = &priv->spi->dev; + u8 *rx_buf = priv->spi_transfer_buf + 4; + u8 *tx_buf = priv->spi_transfer_buf; + struct spi_transfer tx = { + .tx_buf = tx_buf, + .len = SPI_OPLEN, + }; + struct spi_transfer rx = { + .rx_buf = rx_buf, + .len = len, + }; + struct spi_message msg; + int ret; + + tx_buf[0] = ENC28J60_READ_BUF_MEM; + + spi_message_init(&msg); + spi_message_add_tail(&tx, &msg); + spi_message_add_tail(&rx, &msg); + + ret = spi_sync(priv->spi, &msg); + if (ret == 0) { + memcpy(data, rx_buf, len); + ret = msg.status; + } + if (ret && netif_msg_drv(priv)) + dev_printk(KERN_DEBUG, dev, "%s() failed: ret = %d\n", + __func__, ret); + + return ret; +} + +/* + * SPI write buffer + */ +static int spi_write_buf(struct enc28j60_net *priv, int len, const u8 *data) +{ + struct device *dev = &priv->spi->dev; + int ret; + + if (len > SPI_TRANSFER_BUF_LEN - 1 || len <= 0) + ret = -EINVAL; + else { + priv->spi_transfer_buf[0] = ENC28J60_WRITE_BUF_MEM; + memcpy(&priv->spi_transfer_buf[1], data, len); + ret = spi_write(priv->spi, priv->spi_transfer_buf, len + 1); + if (ret && netif_msg_drv(priv)) + dev_printk(KERN_DEBUG, dev, "%s() failed: ret = %d\n", + __func__, ret); + } + return ret; +} + +/* + * basic SPI read operation + */ +static u8 spi_read_op(struct enc28j60_net *priv, u8 op, u8 addr) +{ + struct device *dev = &priv->spi->dev; + u8 tx_buf[2]; + u8 rx_buf[4]; + u8 val = 0; + int ret; + int slen = SPI_OPLEN; + + /* do dummy read if needed */ + if (addr & SPRD_MASK) + slen++; + + tx_buf[0] = op | (addr & ADDR_MASK); + ret = spi_write_then_read(priv->spi, tx_buf, 1, rx_buf, slen); + if (ret) + dev_printk(KERN_DEBUG, dev, "%s() failed: ret = %d\n", + __func__, ret); + else + val = rx_buf[slen - 1]; + + return val; +} + +/* + * basic SPI write operation + */ +static int spi_write_op(struct enc28j60_net *priv, u8 op, u8 addr, u8 val) +{ + struct device *dev = &priv->spi->dev; + int ret; + + priv->spi_transfer_buf[0] = op | (addr & ADDR_MASK); + priv->spi_transfer_buf[1] = val; + ret = spi_write(priv->spi, priv->spi_transfer_buf, 2); + if (ret && netif_msg_drv(priv)) + dev_printk(KERN_DEBUG, dev, "%s() failed: ret = %d\n", + __func__, ret); + return ret; +} + +static void enc28j60_soft_reset(struct enc28j60_net *priv) +{ + spi_write_op(priv, ENC28J60_SOFT_RESET, 0, ENC28J60_SOFT_RESET); + /* Errata workaround #1, CLKRDY check is unreliable, + * delay at least 1 ms instead */ + udelay(2000); +} + +/* + * select the current register bank if necessary + */ +static void enc28j60_set_bank(struct enc28j60_net *priv, u8 addr) +{ + u8 b = (addr & BANK_MASK) >> 5; + + /* These registers (EIE, EIR, ESTAT, ECON2, ECON1) + * are present in all banks, no need to switch bank. + */ + if (addr >= EIE && addr <= ECON1) + return; + + /* Clear or set each bank selection bit as needed */ + if ((b & ECON1_BSEL0) != (priv->bank & ECON1_BSEL0)) { + if (b & ECON1_BSEL0) + spi_write_op(priv, ENC28J60_BIT_FIELD_SET, ECON1, + ECON1_BSEL0); + else + spi_write_op(priv, ENC28J60_BIT_FIELD_CLR, ECON1, + ECON1_BSEL0); + } + if ((b & ECON1_BSEL1) != (priv->bank & ECON1_BSEL1)) { + if (b & ECON1_BSEL1) + spi_write_op(priv, ENC28J60_BIT_FIELD_SET, ECON1, + ECON1_BSEL1); + else + spi_write_op(priv, ENC28J60_BIT_FIELD_CLR, ECON1, + ECON1_BSEL1); + } + priv->bank = b; +} + +/* + * Register access routines through the SPI bus. + * Every register access comes in two flavours: + * - nolock_xxx: caller needs to invoke mutex_lock, usually to access + * atomically more than one register + * - locked_xxx: caller doesn't need to invoke mutex_lock, single access + * + * Some registers can be accessed through the bit field clear and + * bit field set to avoid a read modify write cycle. + */ + +/* + * Register bit field Set + */ +static void nolock_reg_bfset(struct enc28j60_net *priv, u8 addr, u8 mask) +{ + enc28j60_set_bank(priv, addr); + spi_write_op(priv, ENC28J60_BIT_FIELD_SET, addr, mask); +} + +static void locked_reg_bfset(struct enc28j60_net *priv, u8 addr, u8 mask) +{ + mutex_lock(&priv->lock); + nolock_reg_bfset(priv, addr, mask); + mutex_unlock(&priv->lock); +} + +/* + * Register bit field Clear + */ +static void nolock_reg_bfclr(struct enc28j60_net *priv, u8 addr, u8 mask) +{ + enc28j60_set_bank(priv, addr); + spi_write_op(priv, ENC28J60_BIT_FIELD_CLR, addr, mask); +} + +static void locked_reg_bfclr(struct enc28j60_net *priv, u8 addr, u8 mask) +{ + mutex_lock(&priv->lock); + nolock_reg_bfclr(priv, addr, mask); + mutex_unlock(&priv->lock); +} + +/* + * Register byte read + */ +static int nolock_regb_read(struct enc28j60_net *priv, u8 address) +{ + enc28j60_set_bank(priv, address); + return spi_read_op(priv, ENC28J60_READ_CTRL_REG, address); +} + +static int locked_regb_read(struct enc28j60_net *priv, u8 address) +{ + int ret; + + mutex_lock(&priv->lock); + ret = nolock_regb_read(priv, address); + mutex_unlock(&priv->lock); + + return ret; +} + +/* + * Register word read + */ +static int nolock_regw_read(struct enc28j60_net *priv, u8 address) +{ + int rl, rh; + + enc28j60_set_bank(priv, address); + rl = spi_read_op(priv, ENC28J60_READ_CTRL_REG, address); + rh = spi_read_op(priv, ENC28J60_READ_CTRL_REG, address + 1); + + return (rh << 8) | rl; +} + +static int locked_regw_read(struct enc28j60_net *priv, u8 address) +{ + int ret; + + mutex_lock(&priv->lock); + ret = nolock_regw_read(priv, address); + mutex_unlock(&priv->lock); + + return ret; +} + +/* + * Register byte write + */ +static void nolock_regb_write(struct enc28j60_net *priv, u8 address, u8 data) +{ + enc28j60_set_bank(priv, address); + spi_write_op(priv, ENC28J60_WRITE_CTRL_REG, address, data); +} + +static void locked_regb_write(struct enc28j60_net *priv, u8 address, u8 data) +{ + mutex_lock(&priv->lock); + nolock_regb_write(priv, address, data); + mutex_unlock(&priv->lock); +} + +/* + * Register word write + */ +static void nolock_regw_write(struct enc28j60_net *priv, u8 address, u16 data) +{ + enc28j60_set_bank(priv, address); + spi_write_op(priv, ENC28J60_WRITE_CTRL_REG, address, (u8) data); + spi_write_op(priv, ENC28J60_WRITE_CTRL_REG, address + 1, + (u8) (data >> 8)); +} + +static void locked_regw_write(struct enc28j60_net *priv, u8 address, u16 data) +{ + mutex_lock(&priv->lock); + nolock_regw_write(priv, address, data); + mutex_unlock(&priv->lock); +} + +/* + * Buffer memory read + * Select the starting address and execute a SPI buffer read. + */ +static void enc28j60_mem_read(struct enc28j60_net *priv, u16 addr, int len, + u8 *data) +{ + mutex_lock(&priv->lock); + nolock_regw_write(priv, ERDPTL, addr); +#ifdef CONFIG_ENC28J60_WRITEVERIFY + if (netif_msg_drv(priv)) { + struct device *dev = &priv->spi->dev; + u16 reg; + + reg = nolock_regw_read(priv, ERDPTL); + if (reg != addr) + dev_printk(KERN_DEBUG, dev, + "%s() error writing ERDPT (0x%04x - 0x%04x)\n", + __func__, reg, addr); + } +#endif + spi_read_buf(priv, len, data); + mutex_unlock(&priv->lock); +} + +/* + * Write packet to enc28j60 TX buffer memory + */ +static void +enc28j60_packet_write(struct enc28j60_net *priv, int len, const u8 *data) +{ + struct device *dev = &priv->spi->dev; + + mutex_lock(&priv->lock); + /* Set the write pointer to start of transmit buffer area */ + nolock_regw_write(priv, EWRPTL, TXSTART_INIT); +#ifdef CONFIG_ENC28J60_WRITEVERIFY + if (netif_msg_drv(priv)) { + u16 reg; + reg = nolock_regw_read(priv, EWRPTL); + if (reg != TXSTART_INIT) + dev_printk(KERN_DEBUG, dev, + "%s() ERWPT:0x%04x != 0x%04x\n", + __func__, reg, TXSTART_INIT); + } +#endif + /* Set the TXND pointer to correspond to the packet size given */ + nolock_regw_write(priv, ETXNDL, TXSTART_INIT + len); + /* write per-packet control byte */ + spi_write_op(priv, ENC28J60_WRITE_BUF_MEM, 0, 0x00); + if (netif_msg_hw(priv)) + dev_printk(KERN_DEBUG, dev, + "%s() after control byte ERWPT:0x%04x\n", + __func__, nolock_regw_read(priv, EWRPTL)); + /* copy the packet into the transmit buffer */ + spi_write_buf(priv, len, data); + if (netif_msg_hw(priv)) + dev_printk(KERN_DEBUG, dev, + "%s() after write packet ERWPT:0x%04x, len=%d\n", + __func__, nolock_regw_read(priv, EWRPTL), len); + mutex_unlock(&priv->lock); +} + +static int poll_ready(struct enc28j60_net *priv, u8 reg, u8 mask, u8 val) +{ + struct device *dev = &priv->spi->dev; + unsigned long timeout = jiffies + msecs_to_jiffies(20); + + /* 20 msec timeout read */ + while ((nolock_regb_read(priv, reg) & mask) != val) { + if (time_after(jiffies, timeout)) { + if (netif_msg_drv(priv)) + dev_dbg(dev, "reg %02x ready timeout!\n", reg); + return -ETIMEDOUT; + } + cpu_relax(); + } + return 0; +} + +/* + * Wait until the PHY operation is complete. + */ +static int wait_phy_ready(struct enc28j60_net *priv) +{ + return poll_ready(priv, MISTAT, MISTAT_BUSY, 0) ? 0 : 1; +} + +/* + * PHY register read + * PHY registers are not accessed directly, but through the MII. + */ +static u16 enc28j60_phy_read(struct enc28j60_net *priv, u8 address) +{ + u16 ret; + + mutex_lock(&priv->lock); + /* set the PHY register address */ + nolock_regb_write(priv, MIREGADR, address); + /* start the register read operation */ + nolock_regb_write(priv, MICMD, MICMD_MIIRD); + /* wait until the PHY read completes */ + wait_phy_ready(priv); + /* quit reading */ + nolock_regb_write(priv, MICMD, 0x00); + /* return the data */ + ret = nolock_regw_read(priv, MIRDL); + mutex_unlock(&priv->lock); + + return ret; +} + +static int enc28j60_phy_write(struct enc28j60_net *priv, u8 address, u16 data) +{ + int ret; + + mutex_lock(&priv->lock); + /* set the PHY register address */ + nolock_regb_write(priv, MIREGADR, address); + /* write the PHY data */ + nolock_regw_write(priv, MIWRL, data); + /* wait until the PHY write completes and return */ + ret = wait_phy_ready(priv); + mutex_unlock(&priv->lock); + + return ret; +} + +/* + * Program the hardware MAC address from dev->dev_addr. + */ +static int enc28j60_set_hw_macaddr(struct net_device *ndev) +{ + int ret; + struct enc28j60_net *priv = netdev_priv(ndev); + struct device *dev = &priv->spi->dev; + + mutex_lock(&priv->lock); + if (!priv->hw_enable) { + if (netif_msg_drv(priv)) + dev_info(dev, "%s: Setting MAC address to %pM\n", + ndev->name, ndev->dev_addr); + /* NOTE: MAC address in ENC28J60 is byte-backward */ + nolock_regb_write(priv, MAADR5, ndev->dev_addr[0]); + nolock_regb_write(priv, MAADR4, ndev->dev_addr[1]); + nolock_regb_write(priv, MAADR3, ndev->dev_addr[2]); + nolock_regb_write(priv, MAADR2, ndev->dev_addr[3]); + nolock_regb_write(priv, MAADR1, ndev->dev_addr[4]); + nolock_regb_write(priv, MAADR0, ndev->dev_addr[5]); + ret = 0; + } else { + if (netif_msg_drv(priv)) + dev_printk(KERN_DEBUG, dev, + "%s() Hardware must be disabled to set Mac address\n", + __func__); + ret = -EBUSY; + } + mutex_unlock(&priv->lock); + return ret; +} + +/* + * Store the new hardware address in dev->dev_addr, and update the MAC. + */ +static int enc28j60_set_mac_address(struct net_device *dev, void *addr) +{ + struct sockaddr *address = addr; + + if (netif_running(dev)) + return -EBUSY; + if (!is_valid_ether_addr(address->sa_data)) + return -EADDRNOTAVAIL; + + ether_addr_copy(dev->dev_addr, address->sa_data); + return enc28j60_set_hw_macaddr(dev); +} + +/* + * Debug routine to dump useful register contents + */ +static void enc28j60_dump_regs(struct enc28j60_net *priv, const char *msg) +{ + struct device *dev = &priv->spi->dev; + + mutex_lock(&priv->lock); + dev_printk(KERN_DEBUG, dev, + " %s\n" + "HwRevID: 0x%02x\n" + "Cntrl: ECON1 ECON2 ESTAT EIR EIE\n" + " 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n" + "MAC : MACON1 MACON3 MACON4\n" + " 0x%02x 0x%02x 0x%02x\n" + "Rx : ERXST ERXND ERXWRPT ERXRDPT ERXFCON EPKTCNT MAMXFL\n" + " 0x%04x 0x%04x 0x%04x 0x%04x " + "0x%02x 0x%02x 0x%04x\n" + "Tx : ETXST ETXND MACLCON1 MACLCON2 MAPHSUP\n" + " 0x%04x 0x%04x 0x%02x 0x%02x 0x%02x\n", + msg, nolock_regb_read(priv, EREVID), + nolock_regb_read(priv, ECON1), nolock_regb_read(priv, ECON2), + nolock_regb_read(priv, ESTAT), nolock_regb_read(priv, EIR), + nolock_regb_read(priv, EIE), nolock_regb_read(priv, MACON1), + nolock_regb_read(priv, MACON3), nolock_regb_read(priv, MACON4), + nolock_regw_read(priv, ERXSTL), nolock_regw_read(priv, ERXNDL), + nolock_regw_read(priv, ERXWRPTL), + nolock_regw_read(priv, ERXRDPTL), + nolock_regb_read(priv, ERXFCON), + nolock_regb_read(priv, EPKTCNT), + nolock_regw_read(priv, MAMXFLL), nolock_regw_read(priv, ETXSTL), + nolock_regw_read(priv, ETXNDL), + nolock_regb_read(priv, MACLCON1), + nolock_regb_read(priv, MACLCON2), + nolock_regb_read(priv, MAPHSUP)); + mutex_unlock(&priv->lock); +} + +/* + * ERXRDPT need to be set always at odd addresses, refer to errata datasheet + */ +static u16 erxrdpt_workaround(u16 next_packet_ptr, u16 start, u16 end) +{ + u16 erxrdpt; + + if ((next_packet_ptr - 1 < start) || (next_packet_ptr - 1 > end)) + erxrdpt = end; + else + erxrdpt = next_packet_ptr - 1; + + return erxrdpt; +} + +/* + * Calculate wrap around when reading beyond the end of the RX buffer + */ +static u16 rx_packet_start(u16 ptr) +{ + if (ptr + RSV_SIZE > RXEND_INIT) + return (ptr + RSV_SIZE) - (RXEND_INIT - RXSTART_INIT + 1); + else + return ptr + RSV_SIZE; +} + +static void nolock_rxfifo_init(struct enc28j60_net *priv, u16 start, u16 end) +{ + struct device *dev = &priv->spi->dev; + u16 erxrdpt; + + if (start > 0x1FFF || end > 0x1FFF || start > end) { + if (netif_msg_drv(priv)) + dev_err(dev, "%s(%d, %d) RXFIFO bad parameters!\n", + __func__, start, end); + return; + } + /* set receive buffer start + end */ + priv->next_pk_ptr = start; + nolock_regw_write(priv, ERXSTL, start); + erxrdpt = erxrdpt_workaround(priv->next_pk_ptr, start, end); + nolock_regw_write(priv, ERXRDPTL, erxrdpt); + nolock_regw_write(priv, ERXNDL, end); +} + +static void nolock_txfifo_init(struct enc28j60_net *priv, u16 start, u16 end) +{ + struct device *dev = &priv->spi->dev; + + if (start > 0x1FFF || end > 0x1FFF || start > end) { + if (netif_msg_drv(priv)) + dev_err(dev, "%s(%d, %d) TXFIFO bad parameters!\n", + __func__, start, end); + return; + } + /* set transmit buffer start + end */ + nolock_regw_write(priv, ETXSTL, start); + nolock_regw_write(priv, ETXNDL, end); +} + +/* + * Low power mode shrinks power consumption about 100x, so we'd like + * the chip to be in that mode whenever it's inactive. (However, we + * can't stay in low power mode during suspend with WOL active.) + */ +static void enc28j60_lowpower(struct enc28j60_net *priv, bool is_low) +{ + struct device *dev = &priv->spi->dev; + + if (netif_msg_drv(priv)) + dev_dbg(dev, "%s power...\n", is_low ? "low" : "high"); + + mutex_lock(&priv->lock); + if (is_low) { + nolock_reg_bfclr(priv, ECON1, ECON1_RXEN); + poll_ready(priv, ESTAT, ESTAT_RXBUSY, 0); + poll_ready(priv, ECON1, ECON1_TXRTS, 0); + /* ECON2_VRPS was set during initialization */ + nolock_reg_bfset(priv, ECON2, ECON2_PWRSV); + } else { + nolock_reg_bfclr(priv, ECON2, ECON2_PWRSV); + poll_ready(priv, ESTAT, ESTAT_CLKRDY, ESTAT_CLKRDY); + /* caller sets ECON1_RXEN */ + } + mutex_unlock(&priv->lock); +} + +static int enc28j60_hw_init(struct enc28j60_net *priv) +{ + struct device *dev = &priv->spi->dev; + u8 reg; + + if (netif_msg_drv(priv)) + dev_printk(KERN_DEBUG, dev, "%s() - %s\n", __func__, + priv->full_duplex ? "FullDuplex" : "HalfDuplex"); + + mutex_lock(&priv->lock); + /* first reset the chip */ + enc28j60_soft_reset(priv); + /* Clear ECON1 */ + spi_write_op(priv, ENC28J60_WRITE_CTRL_REG, ECON1, 0x00); + priv->bank = 0; + priv->hw_enable = false; + priv->tx_retry_count = 0; + priv->max_pk_counter = 0; + priv->rxfilter = RXFILTER_NORMAL; + /* enable address auto increment and voltage regulator powersave */ + nolock_regb_write(priv, ECON2, ECON2_AUTOINC | ECON2_VRPS); + + nolock_rxfifo_init(priv, RXSTART_INIT, RXEND_INIT); + nolock_txfifo_init(priv, TXSTART_INIT, TXEND_INIT); + mutex_unlock(&priv->lock); + + /* + * Check the RevID. + * If it's 0x00 or 0xFF probably the enc28j60 is not mounted or + * damaged. + */ + reg = locked_regb_read(priv, EREVID); + if (netif_msg_drv(priv)) + dev_info(dev, "chip RevID: 0x%02x\n", reg); + if (reg == 0x00 || reg == 0xff) { + if (netif_msg_drv(priv)) + dev_printk(KERN_DEBUG, dev, "%s() Invalid RevId %d\n", + __func__, reg); + return 0; + } + + /* default filter mode: (unicast OR broadcast) AND crc valid */ + locked_regb_write(priv, ERXFCON, + ERXFCON_UCEN | ERXFCON_CRCEN | ERXFCON_BCEN); + + /* enable MAC receive */ + locked_regb_write(priv, MACON1, + MACON1_MARXEN | MACON1_TXPAUS | MACON1_RXPAUS); + /* enable automatic padding and CRC operations */ + if (priv->full_duplex) { + locked_regb_write(priv, MACON3, + MACON3_PADCFG0 | MACON3_TXCRCEN | + MACON3_FRMLNEN | MACON3_FULDPX); + /* set inter-frame gap (non-back-to-back) */ + locked_regb_write(priv, MAIPGL, 0x12); + /* set inter-frame gap (back-to-back) */ + locked_regb_write(priv, MABBIPG, 0x15); + } else { + locked_regb_write(priv, MACON3, + MACON3_PADCFG0 | MACON3_TXCRCEN | + MACON3_FRMLNEN); + locked_regb_write(priv, MACON4, 1 << 6); /* DEFER bit */ + /* set inter-frame gap (non-back-to-back) */ + locked_regw_write(priv, MAIPGL, 0x0C12); + /* set inter-frame gap (back-to-back) */ + locked_regb_write(priv, MABBIPG, 0x12); + } + /* + * MACLCON1 (default) + * MACLCON2 (default) + * Set the maximum packet size which the controller will accept. + */ + locked_regw_write(priv, MAMXFLL, MAX_FRAMELEN); + + /* Configure LEDs */ + if (!enc28j60_phy_write(priv, PHLCON, ENC28J60_LAMPS_MODE)) + return 0; + + if (priv->full_duplex) { + if (!enc28j60_phy_write(priv, PHCON1, PHCON1_PDPXMD)) + return 0; + if (!enc28j60_phy_write(priv, PHCON2, 0x00)) + return 0; + } else { + if (!enc28j60_phy_write(priv, PHCON1, 0x00)) + return 0; + if (!enc28j60_phy_write(priv, PHCON2, PHCON2_HDLDIS)) + return 0; + } + if (netif_msg_hw(priv)) + enc28j60_dump_regs(priv, "Hw initialized."); + + return 1; +} + +static void enc28j60_hw_enable(struct enc28j60_net *priv) +{ + struct device *dev = &priv->spi->dev; + + /* enable interrupts */ + if (netif_msg_hw(priv)) + dev_printk(KERN_DEBUG, dev, "%s() enabling interrupts.\n", + __func__); + + enc28j60_phy_write(priv, PHIE, PHIE_PGEIE | PHIE_PLNKIE); + + mutex_lock(&priv->lock); + nolock_reg_bfclr(priv, EIR, EIR_DMAIF | EIR_LINKIF | + EIR_TXIF | EIR_TXERIF | EIR_RXERIF | EIR_PKTIF); + nolock_regb_write(priv, EIE, EIE_INTIE | EIE_PKTIE | EIE_LINKIE | + EIE_TXIE | EIE_TXERIE | EIE_RXERIE); + + /* enable receive logic */ + nolock_reg_bfset(priv, ECON1, ECON1_RXEN); + priv->hw_enable = true; + mutex_unlock(&priv->lock); +} + +static void enc28j60_hw_disable(struct enc28j60_net *priv) +{ + mutex_lock(&priv->lock); + /* disable interrupts and packet reception */ + nolock_regb_write(priv, EIE, 0x00); + nolock_reg_bfclr(priv, ECON1, ECON1_RXEN); + priv->hw_enable = false; + mutex_unlock(&priv->lock); +} + +static int +enc28j60_setlink(struct net_device *ndev, u8 autoneg, u16 speed, u8 duplex) +{ + struct enc28j60_net *priv = netdev_priv(ndev); + int ret = 0; + + if (!priv->hw_enable) { + /* link is in low power mode now; duplex setting + * will take effect on next enc28j60_hw_init(). + */ + if (autoneg == AUTONEG_DISABLE && speed == SPEED_10) + priv->full_duplex = (duplex == DUPLEX_FULL); + else { + if (netif_msg_link(priv)) + netdev_warn(ndev, "unsupported link setting\n"); + ret = -EOPNOTSUPP; + } + } else { + if (netif_msg_link(priv)) + netdev_warn(ndev, "Warning: hw must be disabled to set link mode\n"); + ret = -EBUSY; + } + return ret; +} + +/* + * Read the Transmit Status Vector + */ +static void enc28j60_read_tsv(struct enc28j60_net *priv, u8 tsv[TSV_SIZE]) +{ + struct device *dev = &priv->spi->dev; + int endptr; + + endptr = locked_regw_read(priv, ETXNDL); + if (netif_msg_hw(priv)) + dev_printk(KERN_DEBUG, dev, "reading TSV at addr:0x%04x\n", + endptr + 1); + enc28j60_mem_read(priv, endptr + 1, TSV_SIZE, tsv); +} + +static void enc28j60_dump_tsv(struct enc28j60_net *priv, const char *msg, + u8 tsv[TSV_SIZE]) +{ + struct device *dev = &priv->spi->dev; + u16 tmp1, tmp2; + + dev_printk(KERN_DEBUG, dev, "%s - TSV:\n", msg); + tmp1 = tsv[1]; + tmp1 <<= 8; + tmp1 |= tsv[0]; + + tmp2 = tsv[5]; + tmp2 <<= 8; + tmp2 |= tsv[4]; + + dev_printk(KERN_DEBUG, dev, + "ByteCount: %d, CollisionCount: %d, TotByteOnWire: %d\n", + tmp1, tsv[2] & 0x0f, tmp2); + dev_printk(KERN_DEBUG, dev, + "TxDone: %d, CRCErr:%d, LenChkErr: %d, LenOutOfRange: %d\n", + TSV_GETBIT(tsv, TSV_TXDONE), + TSV_GETBIT(tsv, TSV_TXCRCERROR), + TSV_GETBIT(tsv, TSV_TXLENCHKERROR), + TSV_GETBIT(tsv, TSV_TXLENOUTOFRANGE)); + dev_printk(KERN_DEBUG, dev, + "Multicast: %d, Broadcast: %d, PacketDefer: %d, ExDefer: %d\n", + TSV_GETBIT(tsv, TSV_TXMULTICAST), + TSV_GETBIT(tsv, TSV_TXBROADCAST), + TSV_GETBIT(tsv, TSV_TXPACKETDEFER), + TSV_GETBIT(tsv, TSV_TXEXDEFER)); + dev_printk(KERN_DEBUG, dev, + "ExCollision: %d, LateCollision: %d, Giant: %d, Underrun: %d\n", + TSV_GETBIT(tsv, TSV_TXEXCOLLISION), + TSV_GETBIT(tsv, TSV_TXLATECOLLISION), + TSV_GETBIT(tsv, TSV_TXGIANT), TSV_GETBIT(tsv, TSV_TXUNDERRUN)); + dev_printk(KERN_DEBUG, dev, + "ControlFrame: %d, PauseFrame: %d, BackPressApp: %d, VLanTagFrame: %d\n", + TSV_GETBIT(tsv, TSV_TXCONTROLFRAME), + TSV_GETBIT(tsv, TSV_TXPAUSEFRAME), + TSV_GETBIT(tsv, TSV_BACKPRESSUREAPP), + TSV_GETBIT(tsv, TSV_TXVLANTAGFRAME)); +} + +/* + * Receive Status vector + */ +static void enc28j60_dump_rsv(struct enc28j60_net *priv, const char *msg, + u16 pk_ptr, int len, u16 sts) +{ + struct device *dev = &priv->spi->dev; + + dev_printk(KERN_DEBUG, dev, "%s - NextPk: 0x%04x - RSV:\n", msg, pk_ptr); + dev_printk(KERN_DEBUG, dev, "ByteCount: %d, DribbleNibble: %d\n", + len, RSV_GETBIT(sts, RSV_DRIBBLENIBBLE)); + dev_printk(KERN_DEBUG, dev, + "RxOK: %d, CRCErr:%d, LenChkErr: %d, LenOutOfRange: %d\n", + RSV_GETBIT(sts, RSV_RXOK), + RSV_GETBIT(sts, RSV_CRCERROR), + RSV_GETBIT(sts, RSV_LENCHECKERR), + RSV_GETBIT(sts, RSV_LENOUTOFRANGE)); + dev_printk(KERN_DEBUG, dev, + "Multicast: %d, Broadcast: %d, LongDropEvent: %d, CarrierEvent: %d\n", + RSV_GETBIT(sts, RSV_RXMULTICAST), + RSV_GETBIT(sts, RSV_RXBROADCAST), + RSV_GETBIT(sts, RSV_RXLONGEVDROPEV), + RSV_GETBIT(sts, RSV_CARRIEREV)); + dev_printk(KERN_DEBUG, dev, + "ControlFrame: %d, PauseFrame: %d, UnknownOp: %d, VLanTagFrame: %d\n", + RSV_GETBIT(sts, RSV_RXCONTROLFRAME), + RSV_GETBIT(sts, RSV_RXPAUSEFRAME), + RSV_GETBIT(sts, RSV_RXUNKNOWNOPCODE), + RSV_GETBIT(sts, RSV_RXTYPEVLAN)); +} + +static void dump_packet(const char *msg, int len, const char *data) +{ + printk(KERN_DEBUG DRV_NAME ": %s - packet len:%d\n", msg, len); + print_hex_dump(KERN_DEBUG, "pk data: ", DUMP_PREFIX_OFFSET, 16, 1, + data, len, true); +} + +/* + * Hardware receive function. + * Read the buffer memory, update the FIFO pointer to free the buffer, + * check the status vector and decrement the packet counter. + */ +static void enc28j60_hw_rx(struct net_device *ndev) +{ + struct enc28j60_net *priv = netdev_priv(ndev); + struct device *dev = &priv->spi->dev; + struct sk_buff *skb = NULL; + u16 erxrdpt, next_packet, rxstat; + u8 rsv[RSV_SIZE]; + int len; + + if (netif_msg_rx_status(priv)) + netdev_printk(KERN_DEBUG, ndev, "RX pk_addr:0x%04x\n", + priv->next_pk_ptr); + + if (unlikely(priv->next_pk_ptr > RXEND_INIT)) { + if (netif_msg_rx_err(priv)) + netdev_err(ndev, "%s() Invalid packet address!! 0x%04x\n", + __func__, priv->next_pk_ptr); + /* packet address corrupted: reset RX logic */ + mutex_lock(&priv->lock); + nolock_reg_bfclr(priv, ECON1, ECON1_RXEN); + nolock_reg_bfset(priv, ECON1, ECON1_RXRST); + nolock_reg_bfclr(priv, ECON1, ECON1_RXRST); + nolock_rxfifo_init(priv, RXSTART_INIT, RXEND_INIT); + nolock_reg_bfclr(priv, EIR, EIR_RXERIF); + nolock_reg_bfset(priv, ECON1, ECON1_RXEN); + mutex_unlock(&priv->lock); + ndev->stats.rx_errors++; + return; + } + /* Read next packet pointer and rx status vector */ + enc28j60_mem_read(priv, priv->next_pk_ptr, sizeof(rsv), rsv); + + next_packet = rsv[1]; + next_packet <<= 8; + next_packet |= rsv[0]; + + len = rsv[3]; + len <<= 8; + len |= rsv[2]; + + rxstat = rsv[5]; + rxstat <<= 8; + rxstat |= rsv[4]; + + if (netif_msg_rx_status(priv)) + enc28j60_dump_rsv(priv, __func__, next_packet, len, rxstat); + + if (!RSV_GETBIT(rxstat, RSV_RXOK) || len > MAX_FRAMELEN) { + if (netif_msg_rx_err(priv)) + netdev_err(ndev, "Rx Error (%04x)\n", rxstat); + ndev->stats.rx_errors++; + if (RSV_GETBIT(rxstat, RSV_CRCERROR)) + ndev->stats.rx_crc_errors++; + if (RSV_GETBIT(rxstat, RSV_LENCHECKERR)) + ndev->stats.rx_frame_errors++; + if (len > MAX_FRAMELEN) + ndev->stats.rx_over_errors++; + } else { + skb = netdev_alloc_skb(ndev, len + NET_IP_ALIGN); + if (!skb) { + if (netif_msg_rx_err(priv)) + netdev_err(ndev, "out of memory for Rx'd frame\n"); + ndev->stats.rx_dropped++; + } else { + skb_reserve(skb, NET_IP_ALIGN); + /* copy the packet from the receive buffer */ + enc28j60_mem_read(priv, + rx_packet_start(priv->next_pk_ptr), + len, skb_put(skb, len)); + if (netif_msg_pktdata(priv)) + dump_packet(__func__, skb->len, skb->data); + skb->protocol = eth_type_trans(skb, ndev); + /* update statistics */ + ndev->stats.rx_packets++; + ndev->stats.rx_bytes += len; + netif_rx_ni(skb); + } + } + /* + * Move the RX read pointer to the start of the next + * received packet. + * This frees the memory we just read out. + */ + erxrdpt = erxrdpt_workaround(next_packet, RXSTART_INIT, RXEND_INIT); + if (netif_msg_hw(priv)) + dev_printk(KERN_DEBUG, dev, "%s() ERXRDPT:0x%04x\n", + __func__, erxrdpt); + + mutex_lock(&priv->lock); + nolock_regw_write(priv, ERXRDPTL, erxrdpt); +#ifdef CONFIG_ENC28J60_WRITEVERIFY + if (netif_msg_drv(priv)) { + u16 reg; + reg = nolock_regw_read(priv, ERXRDPTL); + if (reg != erxrdpt) + dev_printk(KERN_DEBUG, dev, + "%s() ERXRDPT verify error (0x%04x - 0x%04x)\n", + __func__, reg, erxrdpt); + } +#endif + priv->next_pk_ptr = next_packet; + /* we are done with this packet, decrement the packet counter */ + nolock_reg_bfset(priv, ECON2, ECON2_PKTDEC); + mutex_unlock(&priv->lock); +} + +/* + * Calculate free space in RxFIFO + */ +static int enc28j60_get_free_rxfifo(struct enc28j60_net *priv) +{ + struct net_device *ndev = priv->netdev; + int epkcnt, erxst, erxnd, erxwr, erxrd; + int free_space; + + mutex_lock(&priv->lock); + epkcnt = nolock_regb_read(priv, EPKTCNT); + if (epkcnt >= 255) + free_space = -1; + else { + erxst = nolock_regw_read(priv, ERXSTL); + erxnd = nolock_regw_read(priv, ERXNDL); + erxwr = nolock_regw_read(priv, ERXWRPTL); + erxrd = nolock_regw_read(priv, ERXRDPTL); + + if (erxwr > erxrd) + free_space = (erxnd - erxst) - (erxwr - erxrd); + else if (erxwr == erxrd) + free_space = (erxnd - erxst); + else + free_space = erxrd - erxwr - 1; + } + mutex_unlock(&priv->lock); + if (netif_msg_rx_status(priv)) + netdev_printk(KERN_DEBUG, ndev, "%s() free_space = %d\n", + __func__, free_space); + return free_space; +} + +/* + * Access the PHY to determine link status + */ +static void enc28j60_check_link_status(struct net_device *ndev) +{ + struct enc28j60_net *priv = netdev_priv(ndev); + struct device *dev = &priv->spi->dev; + u16 reg; + int duplex; + + reg = enc28j60_phy_read(priv, PHSTAT2); + if (netif_msg_hw(priv)) + dev_printk(KERN_DEBUG, dev, + "%s() PHSTAT1: %04x, PHSTAT2: %04x\n", __func__, + enc28j60_phy_read(priv, PHSTAT1), reg); + duplex = reg & PHSTAT2_DPXSTAT; + + if (reg & PHSTAT2_LSTAT) { + netif_carrier_on(ndev); + if (netif_msg_ifup(priv)) + netdev_info(ndev, "link up - %s\n", + duplex ? "Full duplex" : "Half duplex"); + } else { + if (netif_msg_ifdown(priv)) + netdev_info(ndev, "link down\n"); + netif_carrier_off(ndev); + } +} + +static void enc28j60_tx_clear(struct net_device *ndev, bool err) +{ + struct enc28j60_net *priv = netdev_priv(ndev); + + if (err) + ndev->stats.tx_errors++; + else + ndev->stats.tx_packets++; + + if (priv->tx_skb) { + if (!err) + ndev->stats.tx_bytes += priv->tx_skb->len; + dev_kfree_skb(priv->tx_skb); + priv->tx_skb = NULL; + } + locked_reg_bfclr(priv, ECON1, ECON1_TXRTS); + netif_wake_queue(ndev); +} + +/* + * RX handler + * Ignore PKTIF because is unreliable! (Look at the errata datasheet) + * Check EPKTCNT is the suggested workaround. + * We don't need to clear interrupt flag, automatically done when + * enc28j60_hw_rx() decrements the packet counter. + * Returns how many packet processed. + */ +static int enc28j60_rx_interrupt(struct net_device *ndev) +{ + struct enc28j60_net *priv = netdev_priv(ndev); + int pk_counter, ret; + + pk_counter = locked_regb_read(priv, EPKTCNT); + if (pk_counter && netif_msg_intr(priv)) + netdev_printk(KERN_DEBUG, ndev, "intRX, pk_cnt: %d\n", + pk_counter); + if (pk_counter > priv->max_pk_counter) { + /* update statistics */ + priv->max_pk_counter = pk_counter; + if (netif_msg_rx_status(priv) && priv->max_pk_counter > 1) + netdev_printk(KERN_DEBUG, ndev, "RX max_pk_cnt: %d\n", + priv->max_pk_counter); + } + ret = pk_counter; + while (pk_counter-- > 0) + enc28j60_hw_rx(ndev); + + return ret; +} + +static void enc28j60_irq_work_handler(struct work_struct *work) +{ + struct enc28j60_net *priv = + container_of(work, struct enc28j60_net, irq_work); + struct net_device *ndev = priv->netdev; + int intflags, loop; + + /* disable further interrupts */ + locked_reg_bfclr(priv, EIE, EIE_INTIE); + + do { + loop = 0; + intflags = locked_regb_read(priv, EIR); + /* DMA interrupt handler (not currently used) */ + if ((intflags & EIR_DMAIF) != 0) { + loop++; + if (netif_msg_intr(priv)) + netdev_printk(KERN_DEBUG, ndev, "intDMA(%d)\n", + loop); + locked_reg_bfclr(priv, EIR, EIR_DMAIF); + } + /* LINK changed handler */ + if ((intflags & EIR_LINKIF) != 0) { + loop++; + if (netif_msg_intr(priv)) + netdev_printk(KERN_DEBUG, ndev, "intLINK(%d)\n", + loop); + enc28j60_check_link_status(ndev); + /* read PHIR to clear the flag */ + enc28j60_phy_read(priv, PHIR); + } + /* TX complete handler */ + if (((intflags & EIR_TXIF) != 0) && + ((intflags & EIR_TXERIF) == 0)) { + bool err = false; + loop++; + if (netif_msg_intr(priv)) + netdev_printk(KERN_DEBUG, ndev, "intTX(%d)\n", + loop); + priv->tx_retry_count = 0; + if (locked_regb_read(priv, ESTAT) & ESTAT_TXABRT) { + if (netif_msg_tx_err(priv)) + netdev_err(ndev, "Tx Error (aborted)\n"); + err = true; + } + if (netif_msg_tx_done(priv)) { + u8 tsv[TSV_SIZE]; + enc28j60_read_tsv(priv, tsv); + enc28j60_dump_tsv(priv, "Tx Done", tsv); + } + enc28j60_tx_clear(ndev, err); + locked_reg_bfclr(priv, EIR, EIR_TXIF); + } + /* TX Error handler */ + if ((intflags & EIR_TXERIF) != 0) { + u8 tsv[TSV_SIZE]; + + loop++; + if (netif_msg_intr(priv)) + netdev_printk(KERN_DEBUG, ndev, "intTXErr(%d)\n", + loop); + locked_reg_bfclr(priv, ECON1, ECON1_TXRTS); + enc28j60_read_tsv(priv, tsv); + if (netif_msg_tx_err(priv)) + enc28j60_dump_tsv(priv, "Tx Error", tsv); + /* Reset TX logic */ + mutex_lock(&priv->lock); + nolock_reg_bfset(priv, ECON1, ECON1_TXRST); + nolock_reg_bfclr(priv, ECON1, ECON1_TXRST); + nolock_txfifo_init(priv, TXSTART_INIT, TXEND_INIT); + mutex_unlock(&priv->lock); + /* Transmit Late collision check for retransmit */ + if (TSV_GETBIT(tsv, TSV_TXLATECOLLISION)) { + if (netif_msg_tx_err(priv)) + netdev_printk(KERN_DEBUG, ndev, + "LateCollision TXErr (%d)\n", + priv->tx_retry_count); + if (priv->tx_retry_count++ < MAX_TX_RETRYCOUNT) + locked_reg_bfset(priv, ECON1, + ECON1_TXRTS); + else + enc28j60_tx_clear(ndev, true); + } else + enc28j60_tx_clear(ndev, true); + locked_reg_bfclr(priv, EIR, EIR_TXERIF | EIR_TXIF); + } + /* RX Error handler */ + if ((intflags & EIR_RXERIF) != 0) { + loop++; + if (netif_msg_intr(priv)) + netdev_printk(KERN_DEBUG, ndev, "intRXErr(%d)\n", + loop); + /* Check free FIFO space to flag RX overrun */ + if (enc28j60_get_free_rxfifo(priv) <= 0) { + if (netif_msg_rx_err(priv)) + netdev_printk(KERN_DEBUG, ndev, "RX Overrun\n"); + ndev->stats.rx_dropped++; + } + locked_reg_bfclr(priv, EIR, EIR_RXERIF); + } + /* RX handler */ + if (enc28j60_rx_interrupt(ndev)) + loop++; + } while (loop); + + /* re-enable interrupts */ + locked_reg_bfset(priv, EIE, EIE_INTIE); +} + +/* + * Hardware transmit function. + * Fill the buffer memory and send the contents of the transmit buffer + * onto the network + */ +static void enc28j60_hw_tx(struct enc28j60_net *priv) +{ + struct net_device *ndev = priv->netdev; + + BUG_ON(!priv->tx_skb); + + if (netif_msg_tx_queued(priv)) + netdev_printk(KERN_DEBUG, ndev, "Tx Packet Len:%d\n", + priv->tx_skb->len); + + if (netif_msg_pktdata(priv)) + dump_packet(__func__, + priv->tx_skb->len, priv->tx_skb->data); + enc28j60_packet_write(priv, priv->tx_skb->len, priv->tx_skb->data); + +#ifdef CONFIG_ENC28J60_WRITEVERIFY + /* readback and verify written data */ + if (netif_msg_drv(priv)) { + struct device *dev = &priv->spi->dev; + int test_len, k; + u8 test_buf[64]; /* limit the test to the first 64 bytes */ + int okflag; + + test_len = priv->tx_skb->len; + if (test_len > sizeof(test_buf)) + test_len = sizeof(test_buf); + + /* + 1 to skip control byte */ + enc28j60_mem_read(priv, TXSTART_INIT + 1, test_len, test_buf); + okflag = 1; + for (k = 0; k < test_len; k++) { + if (priv->tx_skb->data[k] != test_buf[k]) { + dev_printk(KERN_DEBUG, dev, + "Error, %d location differ: 0x%02x-0x%02x\n", + k, priv->tx_skb->data[k], test_buf[k]); + okflag = 0; + } + } + if (!okflag) + dev_printk(KERN_DEBUG, dev, "Tx write buffer, verify ERROR!\n"); + } +#endif + /* set TX request flag */ + locked_reg_bfset(priv, ECON1, ECON1_TXRTS); +} + +static netdev_tx_t enc28j60_send_packet(struct sk_buff *skb, + struct net_device *dev) +{ + struct enc28j60_net *priv = netdev_priv(dev); + + /* If some error occurs while trying to transmit this + * packet, you should return '1' from this function. + * In such a case you _may not_ do anything to the + * SKB, it is still owned by the network queueing + * layer when an error is returned. This means you + * may not modify any SKB fields, you may not free + * the SKB, etc. + */ + netif_stop_queue(dev); + + /* Remember the skb for deferred processing */ + priv->tx_skb = skb; + schedule_work(&priv->tx_work); + + return NETDEV_TX_OK; +} + +static void enc28j60_tx_work_handler(struct work_struct *work) +{ + struct enc28j60_net *priv = + container_of(work, struct enc28j60_net, tx_work); + + /* actual delivery of data */ + enc28j60_hw_tx(priv); +} + +static irqreturn_t enc28j60_irq(int irq, void *dev_id) +{ + struct enc28j60_net *priv = dev_id; + + /* + * Can't do anything in interrupt context because we need to + * block (spi_sync() is blocking) so fire of the interrupt + * handling workqueue. + * Remember that we access enc28j60 registers through SPI bus + * via spi_sync() call. + */ + schedule_work(&priv->irq_work); + + return IRQ_HANDLED; +} + +static void enc28j60_tx_timeout(struct net_device *ndev, unsigned int txqueue) +{ + struct enc28j60_net *priv = netdev_priv(ndev); + + if (netif_msg_timer(priv)) + netdev_err(ndev, "tx timeout\n"); + + ndev->stats.tx_errors++; + /* can't restart safely under softirq */ + schedule_work(&priv->restart_work); +} + +/* + * Open/initialize the board. This is called (in the current kernel) + * sometime after booting when the 'ifconfig' program is run. + * + * This routine should set everything up anew at each open, even + * registers that "should" only need to be set once at boot, so that + * there is non-reboot way to recover if something goes wrong. + */ +static int enc28j60_net_open(struct net_device *dev) +{ + struct enc28j60_net *priv = netdev_priv(dev); + + if (!is_valid_ether_addr(dev->dev_addr)) { + if (netif_msg_ifup(priv)) + netdev_err(dev, "invalid MAC address %pM\n", dev->dev_addr); + return -EADDRNOTAVAIL; + } + /* Reset the hardware here (and take it out of low power mode) */ + enc28j60_lowpower(priv, false); + enc28j60_hw_disable(priv); + if (!enc28j60_hw_init(priv)) { + if (netif_msg_ifup(priv)) + netdev_err(dev, "hw_reset() failed\n"); + return -EINVAL; + } + /* Update the MAC address (in case user has changed it) */ + enc28j60_set_hw_macaddr(dev); + /* Enable interrupts */ + enc28j60_hw_enable(priv); + /* check link status */ + enc28j60_check_link_status(dev); + /* We are now ready to accept transmit requests from + * the queueing layer of the networking. + */ + netif_start_queue(dev); + + return 0; +} + +/* The inverse routine to net_open(). */ +static int enc28j60_net_close(struct net_device *dev) +{ + struct enc28j60_net *priv = netdev_priv(dev); + + enc28j60_hw_disable(priv); + enc28j60_lowpower(priv, true); + netif_stop_queue(dev); + + return 0; +} + +/* + * Set or clear the multicast filter for this adapter + * num_addrs == -1 Promiscuous mode, receive all packets + * num_addrs == 0 Normal mode, filter out multicast packets + * num_addrs > 0 Multicast mode, receive normal and MC packets + */ +static void enc28j60_set_multicast_list(struct net_device *dev) +{ + struct enc28j60_net *priv = netdev_priv(dev); + int oldfilter = priv->rxfilter; + + if (dev->flags & IFF_PROMISC) { + if (netif_msg_link(priv)) + netdev_info(dev, "promiscuous mode\n"); + priv->rxfilter = RXFILTER_PROMISC; + } else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev)) { + if (netif_msg_link(priv)) + netdev_info(dev, "%smulticast mode\n", + (dev->flags & IFF_ALLMULTI) ? "all-" : ""); + priv->rxfilter = RXFILTER_MULTI; + } else { + if (netif_msg_link(priv)) + netdev_info(dev, "normal mode\n"); + priv->rxfilter = RXFILTER_NORMAL; + } + + if (oldfilter != priv->rxfilter) + schedule_work(&priv->setrx_work); +} + +static void enc28j60_setrx_work_handler(struct work_struct *work) +{ + struct enc28j60_net *priv = + container_of(work, struct enc28j60_net, setrx_work); + struct device *dev = &priv->spi->dev; + + if (priv->rxfilter == RXFILTER_PROMISC) { + if (netif_msg_drv(priv)) + dev_printk(KERN_DEBUG, dev, "promiscuous mode\n"); + locked_regb_write(priv, ERXFCON, 0x00); + } else if (priv->rxfilter == RXFILTER_MULTI) { + if (netif_msg_drv(priv)) + dev_printk(KERN_DEBUG, dev, "multicast mode\n"); + locked_regb_write(priv, ERXFCON, + ERXFCON_UCEN | ERXFCON_CRCEN | + ERXFCON_BCEN | ERXFCON_MCEN); + } else { + if (netif_msg_drv(priv)) + dev_printk(KERN_DEBUG, dev, "normal mode\n"); + locked_regb_write(priv, ERXFCON, + ERXFCON_UCEN | ERXFCON_CRCEN | + ERXFCON_BCEN); + } +} + +static void enc28j60_restart_work_handler(struct work_struct *work) +{ + struct enc28j60_net *priv = + container_of(work, struct enc28j60_net, restart_work); + struct net_device *ndev = priv->netdev; + int ret; + + rtnl_lock(); + if (netif_running(ndev)) { + enc28j60_net_close(ndev); + ret = enc28j60_net_open(ndev); + if (unlikely(ret)) { + netdev_info(ndev, "could not restart %d\n", ret); + dev_close(ndev); + } + } + rtnl_unlock(); +} + +/* ......................... ETHTOOL SUPPORT ........................... */ + +static void +enc28j60_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) +{ + strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); + strlcpy(info->version, DRV_VERSION, sizeof(info->version)); + strlcpy(info->bus_info, + dev_name(dev->dev.parent), sizeof(info->bus_info)); +} + +static int +enc28j60_get_link_ksettings(struct net_device *dev, + struct ethtool_link_ksettings *cmd) +{ + struct enc28j60_net *priv = netdev_priv(dev); + + ethtool_link_ksettings_zero_link_mode(cmd, supported); + ethtool_link_ksettings_add_link_mode(cmd, supported, 10baseT_Half); + ethtool_link_ksettings_add_link_mode(cmd, supported, 10baseT_Full); + ethtool_link_ksettings_add_link_mode(cmd, supported, TP); + + cmd->base.speed = SPEED_10; + cmd->base.duplex = priv->full_duplex ? DUPLEX_FULL : DUPLEX_HALF; + cmd->base.port = PORT_TP; + cmd->base.autoneg = AUTONEG_DISABLE; + + return 0; +} + +static int +enc28j60_set_link_ksettings(struct net_device *dev, + const struct ethtool_link_ksettings *cmd) +{ + return enc28j60_setlink(dev, cmd->base.autoneg, + cmd->base.speed, cmd->base.duplex); +} + +static u32 enc28j60_get_msglevel(struct net_device *dev) +{ + struct enc28j60_net *priv = netdev_priv(dev); + return priv->msg_enable; +} + +static void enc28j60_set_msglevel(struct net_device *dev, u32 val) +{ + struct enc28j60_net *priv = netdev_priv(dev); + priv->msg_enable = val; +} + +static const struct ethtool_ops enc28j60_ethtool_ops = { + .get_drvinfo = enc28j60_get_drvinfo, + .get_msglevel = enc28j60_get_msglevel, + .set_msglevel = enc28j60_set_msglevel, + .get_link_ksettings = enc28j60_get_link_ksettings, + .set_link_ksettings = enc28j60_set_link_ksettings, +}; + +static int enc28j60_chipset_init(struct net_device *dev) +{ + struct enc28j60_net *priv = netdev_priv(dev); + + return enc28j60_hw_init(priv); +} + +static const struct net_device_ops enc28j60_netdev_ops = { + .ndo_open = enc28j60_net_open, + .ndo_stop = enc28j60_net_close, + .ndo_start_xmit = enc28j60_send_packet, + .ndo_set_rx_mode = enc28j60_set_multicast_list, + .ndo_set_mac_address = enc28j60_set_mac_address, + .ndo_tx_timeout = enc28j60_tx_timeout, + .ndo_validate_addr = eth_validate_addr, +}; + +static int enc28j60_probe(struct spi_device *spi) +{ + unsigned char macaddr[ETH_ALEN]; + struct net_device *dev; + struct enc28j60_net *priv; + int ret = 0; + + if (netif_msg_drv(&debug)) + dev_info(&spi->dev, "Ethernet driver %s loaded\n", DRV_VERSION); + + dev = alloc_etherdev(sizeof(struct enc28j60_net)); + if (!dev) { + ret = -ENOMEM; + goto error_alloc; + } + priv = netdev_priv(dev); + + priv->netdev = dev; /* priv to netdev reference */ + priv->spi = spi; /* priv to spi reference */ + priv->msg_enable = netif_msg_init(debug.msg_enable, ENC28J60_MSG_DEFAULT); + mutex_init(&priv->lock); + INIT_WORK(&priv->tx_work, enc28j60_tx_work_handler); + INIT_WORK(&priv->setrx_work, enc28j60_setrx_work_handler); + INIT_WORK(&priv->irq_work, enc28j60_irq_work_handler); + INIT_WORK(&priv->restart_work, enc28j60_restart_work_handler); + spi_set_drvdata(spi, priv); /* spi to priv reference */ + SET_NETDEV_DEV(dev, &spi->dev); + + if (!enc28j60_chipset_init(dev)) { + if (netif_msg_probe(priv)) + dev_info(&spi->dev, "chip not found\n"); + ret = -EIO; + goto error_irq; + } + + if (device_get_mac_address(&spi->dev, macaddr, sizeof(macaddr))) + ether_addr_copy(dev->dev_addr, macaddr); + else + eth_hw_addr_random(dev); + enc28j60_set_hw_macaddr(dev); + + /* Board setup must set the relevant edge trigger type; + * level triggers won't currently work. + */ + ret = request_irq(spi->irq, enc28j60_irq, 0, DRV_NAME, priv); + if (ret < 0) { + if (netif_msg_probe(priv)) + dev_err(&spi->dev, "request irq %d failed (ret = %d)\n", + spi->irq, ret); + goto error_irq; + } + + dev->if_port = IF_PORT_10BASET; + dev->irq = spi->irq; + dev->netdev_ops = &enc28j60_netdev_ops; + dev->watchdog_timeo = TX_TIMEOUT; + dev->ethtool_ops = &enc28j60_ethtool_ops; + + enc28j60_lowpower(priv, true); + + ret = register_netdev(dev); + if (ret) { + if (netif_msg_probe(priv)) + dev_err(&spi->dev, "register netdev failed (ret = %d)\n", + ret); + goto error_register; + } + + return 0; + +error_register: + free_irq(spi->irq, priv); +error_irq: + free_netdev(dev); +error_alloc: + return ret; +} + +static int enc28j60_remove(struct spi_device *spi) +{ + struct enc28j60_net *priv = spi_get_drvdata(spi); + + unregister_netdev(priv->netdev); + free_irq(spi->irq, priv); + free_netdev(priv->netdev); + + return 0; +} + +static const struct of_device_id enc28j60_dt_ids[] = { + { .compatible = "microchip,enc28j60" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, enc28j60_dt_ids); + +static struct spi_driver enc28j60_driver = { + .driver = { + .name = DRV_NAME, + .of_match_table = enc28j60_dt_ids, + }, + .probe = enc28j60_probe, + .remove = enc28j60_remove, +}; +module_spi_driver(enc28j60_driver); + +MODULE_DESCRIPTION(DRV_NAME " ethernet driver"); +MODULE_AUTHOR("Claudio Lanconelli <lanconelli.claudio@eptar.com>"); +MODULE_LICENSE("GPL"); +module_param_named(debug, debug.msg_enable, int, 0); +MODULE_PARM_DESC(debug, "Debug verbosity level in amount of bits set (0=none, ..., 31=all)"); +MODULE_ALIAS("spi:" DRV_NAME); |