Quelle smsc911x.c Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/***************************************************************************
*
* Copyright (C) 2004-2008 SMSC
* Copyright (C) 2005-2008 ARM
*
***************************************************************************
* Rewritten, heavily based on smsc911x simple driver by SMSC.
* Partly uses io macros from smc91x.c by Nicolas Pitre
*
* Supported devices:
*   LAN9115, LAN9116, LAN9117, LAN9118
*   LAN9215, LAN9216, LAN9217, LAN9218
*   LAN9210, LAN9211
*   LAN9220, LAN9221
*   LAN89218,LAN9250
*/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/crc32.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/bug.h>
#include <linux/bitops.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/swab.h>
#include <linux/phy.h>
#include <linux/smsc911x.h>
#include <linux/device.h>
#include <linux/of.h>
#include <linux/of_net.h>
#include <linux/acpi.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <linux/gpio/consumer.h>

#include "smsc911x.h"

#define SMSC_CHIPNAME  "smsc911x"
#define SMSC_MDIONAME  "smsc911x-mdio"
#define SMSC_DRV_VERSION "2008-10-21"

MODULE_DESCRIPTION("SMSC LAN911x/LAN921x Ethernet driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(SMSC_DRV_VERSION);
MODULE_ALIAS("platform:smsc911x");

#if USE_DEBUG > 0
static int debug = 16;
#else
static int debug = 3;
#endif

module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");

struct smsc911x_data;

struct smsc911x_ops {
u32 (*reg_read)(struct smsc911x_data *pdata, u32 reg);
void (*reg_write)(struct smsc911x_data *pdata, u32 reg, u32 val);
void (*rx_readfifo)(struct smsc911x_data *pdata,
    unsigned int *buf, unsigned int wordcount);
void (*tx_writefifo)(struct smsc911x_data *pdata,
    unsigned int *buf, unsigned int wordcount);
};

#define SMSC911X_NUM_SUPPLIES 2

struct smsc911x_data {
void __iomem *ioaddr;

unsigned int idrev;

/* used to decide which workarounds apply */
unsigned int generation;

/* device configuration (copied from platform_data during probe) */
struct smsc911x_platform_config config;

/* This needs to be acquired before calling any of below:
* smsc911x_mac_read(), smsc911x_mac_write()
*/
spinlock_t mac_lock;

/* spinlock to ensure register accesses are serialised */
spinlock_t dev_lock;

struct mii_bus *mii_bus;
unsigned int using_extphy;
int last_duplex;
int last_carrier;

u32 msg_enable;
unsigned int gpio_setting;
unsigned int gpio_orig_setting;
struct net_device *dev;
struct napi_struct napi;

unsigned int software_irq_signal;

#ifdef USE_PHY_WORK_AROUND
#define MIN_PACKET_SIZE (64)
char loopback_tx_pkt[MIN_PACKET_SIZE];
char loopback_rx_pkt[MIN_PACKET_SIZE];
unsigned int resetcount;
#endif

/* Members for Multicast filter workaround */
unsigned int multicast_update_pending;
unsigned int set_bits_mask;
unsigned int clear_bits_mask;
unsigned int hashhi;
unsigned int hashlo;

/* register access functions */
const struct smsc911x_ops *ops;

/* regulators */
struct regulator_bulk_data supplies[SMSC911X_NUM_SUPPLIES];

/* Reset GPIO */
struct gpio_desc *reset_gpiod;

/* clock */
struct clk *clk;
};

/* Easy access to information */
#define __smsc_shift(pdata, reg) ((reg) << ((pdata)->config.shift))

static inline u32 __smsc911x_reg_read(struct smsc911x_data *pdata, u32 reg)
{
if (pdata->config.flags & SMSC911X_USE_32BIT)
  return readl(pdata->ioaddr + reg);

if (pdata->config.flags & SMSC911X_USE_16BIT)
  return ((readw(pdata->ioaddr + reg) & 0xFFFF) |
   ((readw(pdata->ioaddr + reg + 2) & 0xFFFF) << 16));

BUG();
return 0;
}

static inline u32
__smsc911x_reg_read_shift(struct smsc911x_data *pdata, u32 reg)
{
if (pdata->config.flags & SMSC911X_USE_32BIT)
  return readl(pdata->ioaddr + __smsc_shift(pdata, reg));

if (pdata->config.flags & SMSC911X_USE_16BIT)
  return (readw(pdata->ioaddr +
    __smsc_shift(pdata, reg)) & 0xFFFF) |
   ((readw(pdata->ioaddr +
   __smsc_shift(pdata, reg + 2)) & 0xFFFF) << 16);

BUG();
return 0;
}

static inline u32 smsc911x_reg_read(struct smsc911x_data *pdata, u32 reg)
{
u32 data;
unsigned long flags;

spin_lock_irqsave(&pdata->dev_lock, flags);
data = pdata->ops->reg_read(pdata, reg);
spin_unlock_irqrestore(&pdata->dev_lock, flags);

return data;
}

static inline void __smsc911x_reg_write(struct smsc911x_data *pdata, u32 reg,
     u32 val)
{
if (pdata->config.flags & SMSC911X_USE_32BIT) {
  writel(val, pdata->ioaddr + reg);
  return;
}

if (pdata->config.flags & SMSC911X_USE_16BIT) {
  writew(val & 0xFFFF, pdata->ioaddr + reg);
  writew((val >> 16) & 0xFFFF, pdata->ioaddr + reg + 2);
  return;
}

BUG();
}

static inline void
__smsc911x_reg_write_shift(struct smsc911x_data *pdata, u32 reg, u32 val)
{
if (pdata->config.flags & SMSC911X_USE_32BIT) {
  writel(val, pdata->ioaddr + __smsc_shift(pdata, reg));
  return;
}

if (pdata->config.flags & SMSC911X_USE_16BIT) {
  writew(val & 0xFFFF,
   pdata->ioaddr + __smsc_shift(pdata, reg));
  writew((val >> 16) & 0xFFFF,
   pdata->ioaddr + __smsc_shift(pdata, reg + 2));
  return;
}

BUG();
}

static inline void smsc911x_reg_write(struct smsc911x_data *pdata, u32 reg,
          u32 val)
{
unsigned long flags;

spin_lock_irqsave(&pdata->dev_lock, flags);
pdata->ops->reg_write(pdata, reg, val);
spin_unlock_irqrestore(&pdata->dev_lock, flags);
}

/* Writes a packet to the TX_DATA_FIFO */
static inline void
smsc911x_tx_writefifo(struct smsc911x_data *pdata, unsigned int *buf,
        unsigned int wordcount)
{
unsigned long flags;

spin_lock_irqsave(&pdata->dev_lock, flags);

if (pdata->config.flags & SMSC911X_SWAP_FIFO) {
  while (wordcount--)
   __smsc911x_reg_write(pdata, TX_DATA_FIFO,
          swab32(*buf++));
  goto out;
}

if (pdata->config.flags & SMSC911X_USE_32BIT) {
  iowrite32_rep(pdata->ioaddr + TX_DATA_FIFO, buf, wordcount);
  goto out;
}

if (pdata->config.flags & SMSC911X_USE_16BIT) {
  while (wordcount--)
   __smsc911x_reg_write(pdata, TX_DATA_FIFO, *buf++);
  goto out;
}

BUG();
out:
spin_unlock_irqrestore(&pdata->dev_lock, flags);
}

/* Writes a packet to the TX_DATA_FIFO - shifted version */
static inline void
smsc911x_tx_writefifo_shift(struct smsc911x_data *pdata, unsigned int *buf,
        unsigned int wordcount)
{
unsigned long flags;

spin_lock_irqsave(&pdata->dev_lock, flags);

if (pdata->config.flags & SMSC911X_SWAP_FIFO) {
  while (wordcount--)
   __smsc911x_reg_write_shift(pdata, TX_DATA_FIFO,
          swab32(*buf++));
  goto out;
}

if (pdata->config.flags & SMSC911X_USE_32BIT) {
  iowrite32_rep(pdata->ioaddr + __smsc_shift(pdata,
      TX_DATA_FIFO), buf, wordcount);
  goto out;
}

if (pdata->config.flags & SMSC911X_USE_16BIT) {
  while (wordcount--)
   __smsc911x_reg_write_shift(pdata,
       TX_DATA_FIFO, *buf++);
  goto out;
}

BUG();
out:
spin_unlock_irqrestore(&pdata->dev_lock, flags);
}

/* Reads a packet out of the RX_DATA_FIFO */
static inline void
smsc911x_rx_readfifo(struct smsc911x_data *pdata, unsigned int *buf,
       unsigned int wordcount)
{
unsigned long flags;

spin_lock_irqsave(&pdata->dev_lock, flags);

if (pdata->config.flags & SMSC911X_SWAP_FIFO) {
  while (wordcount--)
   *buf++ = swab32(__smsc911x_reg_read(pdata,
           RX_DATA_FIFO));
  goto out;
}

if (pdata->config.flags & SMSC911X_USE_32BIT) {
  ioread32_rep(pdata->ioaddr + RX_DATA_FIFO, buf, wordcount);
  goto out;
}

if (pdata->config.flags & SMSC911X_USE_16BIT) {
  while (wordcount--)
   *buf++ = __smsc911x_reg_read(pdata, RX_DATA_FIFO);
  goto out;
}

BUG();
out:
spin_unlock_irqrestore(&pdata->dev_lock, flags);
}

/* Reads a packet out of the RX_DATA_FIFO - shifted version */
static inline void
smsc911x_rx_readfifo_shift(struct smsc911x_data *pdata, unsigned int *buf,
       unsigned int wordcount)
{
unsigned long flags;

spin_lock_irqsave(&pdata->dev_lock, flags);

if (pdata->config.flags & SMSC911X_SWAP_FIFO) {
  while (wordcount--)
   *buf++ = swab32(__smsc911x_reg_read_shift(pdata,
           RX_DATA_FIFO));
  goto out;
}

if (pdata->config.flags & SMSC911X_USE_32BIT) {
  ioread32_rep(pdata->ioaddr + __smsc_shift(pdata,
      RX_DATA_FIFO), buf, wordcount);
  goto out;
}

if (pdata->config.flags & SMSC911X_USE_16BIT) {
  while (wordcount--)
   *buf++ = __smsc911x_reg_read_shift(pdata,
        RX_DATA_FIFO);
  goto out;
}

BUG();
out:
spin_unlock_irqrestore(&pdata->dev_lock, flags);
}

/*
* enable regulator and clock resources.
*/
static int smsc911x_enable_resources(struct platform_device *pdev)
{
struct net_device *ndev = platform_get_drvdata(pdev);
struct smsc911x_data *pdata = netdev_priv(ndev);
int ret = 0;

ret = regulator_bulk_enable(ARRAY_SIZE(pdata->supplies),
   pdata->supplies);
if (ret)
  netdev_err(ndev, "failed to enable regulators %d\n",
    ret);

if (!IS_ERR(pdata->clk)) {
  ret = clk_prepare_enable(pdata->clk);
  if (ret < 0)
   netdev_err(ndev, "failed to enable clock %d\n", ret);
}

return ret;
}

/*
* disable resources, currently just regulators.
*/
static int smsc911x_disable_resources(struct platform_device *pdev)
{
struct net_device *ndev = platform_get_drvdata(pdev);
struct smsc911x_data *pdata = netdev_priv(ndev);
int ret = 0;

ret = regulator_bulk_disable(ARRAY_SIZE(pdata->supplies),
   pdata->supplies);

if (!IS_ERR(pdata->clk))
  clk_disable_unprepare(pdata->clk);

return ret;
}

/*
* Request resources, currently just regulators.
*
* The SMSC911x has two power pins: vddvario and vdd33a, in designs where
* these are not always-on we need to request regulators to be turned on
* before we can try to access the device registers.
*/
static int smsc911x_request_resources(struct platform_device *pdev)
{
struct net_device *ndev = platform_get_drvdata(pdev);
struct smsc911x_data *pdata = netdev_priv(ndev);
int ret = 0;

/* Request regulators */
pdata->supplies[0].supply = "vdd33a";
pdata->supplies[1].supply = "vddvario";
ret = regulator_bulk_get(&pdev->dev,
   ARRAY_SIZE(pdata->supplies),
   pdata->supplies);
if (ret) {
  /*
* Retry on deferrals, else just report the error
* and try to continue.
*/
  if (ret == -EPROBE_DEFER)
   return ret;
  netdev_err(ndev, "couldn't get regulators %d\n",
    ret);
}

/* Request optional RESET GPIO */
pdata->reset_gpiod = devm_gpiod_get_optional(&pdev->dev,
           "reset",
           GPIOD_OUT_LOW);

/* Request clock */
pdata->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(pdata->clk))
  dev_dbg(&pdev->dev, "couldn't get clock %li\n",
   PTR_ERR(pdata->clk));

return ret;
}

/*
* Free resources, currently just regulators.
*
*/
static void smsc911x_free_resources(struct platform_device *pdev)
{
struct net_device *ndev = platform_get_drvdata(pdev);
struct smsc911x_data *pdata = netdev_priv(ndev);

/* Free regulators */
regulator_bulk_free(ARRAY_SIZE(pdata->supplies),
   pdata->supplies);

/* Free clock */
if (!IS_ERR(pdata->clk)) {
  clk_put(pdata->clk);
  pdata->clk = NULL;
}
}

/* waits for MAC not busy, with timeout.  Only called by smsc911x_mac_read
* and smsc911x_mac_write, so assumes mac_lock is held */
static int smsc911x_mac_complete(struct smsc911x_data *pdata)
{
int i;
u32 val;

SMSC_ASSERT_MAC_LOCK(pdata);

for (i = 0; i < 40; i++) {
  val = smsc911x_reg_read(pdata, MAC_CSR_CMD);
  if (!(val & MAC_CSR_CMD_CSR_BUSY_))
   return 0;
}
SMSC_WARN(pdata, hw, "Timed out waiting for MAC not BUSY. "
    "MAC_CSR_CMD: 0x%08X", val);
return -EIO;
}

/* Fetches a MAC register value. Assumes mac_lock is acquired */
static u32 smsc911x_mac_read(struct smsc911x_data *pdata, unsigned int offset)
{
unsigned int temp;

SMSC_ASSERT_MAC_LOCK(pdata);

temp = smsc911x_reg_read(pdata, MAC_CSR_CMD);
if (unlikely(temp & MAC_CSR_CMD_CSR_BUSY_)) {
  SMSC_WARN(pdata, hw, "MAC busy at entry");
  return 0xFFFFFFFF;
}

/* Send the MAC cmd */
smsc911x_reg_write(pdata, MAC_CSR_CMD, ((offset & 0xFF) |
  MAC_CSR_CMD_CSR_BUSY_ | MAC_CSR_CMD_R_NOT_W_));

/* Workaround for hardware read-after-write restriction */
temp = smsc911x_reg_read(pdata, BYTE_TEST);

/* Wait for the read to complete */
if (likely(smsc911x_mac_complete(pdata) == 0))
  return smsc911x_reg_read(pdata, MAC_CSR_DATA);

SMSC_WARN(pdata, hw, "MAC busy after read");
return 0xFFFFFFFF;
}

/* Set a mac register, mac_lock must be acquired before calling */
static void smsc911x_mac_write(struct smsc911x_data *pdata,
          unsigned int offset, u32 val)
{
unsigned int temp;

SMSC_ASSERT_MAC_LOCK(pdata);

temp = smsc911x_reg_read(pdata, MAC_CSR_CMD);
if (unlikely(temp & MAC_CSR_CMD_CSR_BUSY_)) {
  SMSC_WARN(pdata, hw,
     "smsc911x_mac_write failed, MAC busy at entry");
  return;
}

/* Send data to write */
smsc911x_reg_write(pdata, MAC_CSR_DATA, val);

/* Write the actual data */
smsc911x_reg_write(pdata, MAC_CSR_CMD, ((offset & 0xFF) |
  MAC_CSR_CMD_CSR_BUSY_));

/* Workaround for hardware read-after-write restriction */
temp = smsc911x_reg_read(pdata, BYTE_TEST);

/* Wait for the write to complete */
if (likely(smsc911x_mac_complete(pdata) == 0))
  return;

SMSC_WARN(pdata, hw, "smsc911x_mac_write failed, MAC busy after write");
}

/* Get a phy register */
static int smsc911x_mii_read(struct mii_bus *bus, int phyaddr, int regidx)
{
struct smsc911x_data *pdata = bus->priv;
unsigned long flags;
unsigned int addr;
int i, reg;

pm_runtime_get_sync(bus->parent);
spin_lock_irqsave(&pdata->mac_lock, flags);

/* Confirm MII not busy */
if (unlikely(smsc911x_mac_read(pdata, MII_ACC) & MII_ACC_MII_BUSY_)) {
  SMSC_WARN(pdata, hw, "MII is busy in smsc911x_mii_read???");
  reg = -EIO;
  goto out;
}

/* Set the address, index & direction (read from PHY) */
addr = ((phyaddr & 0x1F) << 11) | ((regidx & 0x1F) << 6);
smsc911x_mac_write(pdata, MII_ACC, addr);

/* Wait for read to complete w/ timeout */
for (i = 0; i < 100; i++)
  if (!(smsc911x_mac_read(pdata, MII_ACC) & MII_ACC_MII_BUSY_)) {
   reg = smsc911x_mac_read(pdata, MII_DATA);
   goto out;
  }

SMSC_WARN(pdata, hw, "Timed out waiting for MII read to finish");
reg = -EIO;

out:
spin_unlock_irqrestore(&pdata->mac_lock, flags);
pm_runtime_put(bus->parent);
return reg;
}

/* Set a phy register */
static int smsc911x_mii_write(struct mii_bus *bus, int phyaddr, int regidx,
      u16 val)
{
struct smsc911x_data *pdata = bus->priv;
unsigned long flags;
unsigned int addr;
int i, reg;

pm_runtime_get_sync(bus->parent);
spin_lock_irqsave(&pdata->mac_lock, flags);

/* Confirm MII not busy */
if (unlikely(smsc911x_mac_read(pdata, MII_ACC) & MII_ACC_MII_BUSY_)) {
  SMSC_WARN(pdata, hw, "MII is busy in smsc911x_mii_write???");
  reg = -EIO;
  goto out;
}

/* Put the data to write in the MAC */
smsc911x_mac_write(pdata, MII_DATA, val);

/* Set the address, index & direction (write to PHY) */
addr = ((phyaddr & 0x1F) << 11) | ((regidx & 0x1F) << 6) |
  MII_ACC_MII_WRITE_;
smsc911x_mac_write(pdata, MII_ACC, addr);

/* Wait for write to complete w/ timeout */
for (i = 0; i < 100; i++)
  if (!(smsc911x_mac_read(pdata, MII_ACC) & MII_ACC_MII_BUSY_)) {
   reg = 0;
   goto out;
  }

SMSC_WARN(pdata, hw, "Timed out waiting for MII write to finish");
reg = -EIO;

out:
spin_unlock_irqrestore(&pdata->mac_lock, flags);
pm_runtime_put(bus->parent);
return reg;
}

/* Switch to external phy. Assumes tx and rx are stopped. */
static void smsc911x_phy_enable_external(struct smsc911x_data *pdata)
{
unsigned int hwcfg = smsc911x_reg_read(pdata, HW_CFG);

/* Disable phy clocks to the MAC */
hwcfg &= (~HW_CFG_PHY_CLK_SEL_);
hwcfg |= HW_CFG_PHY_CLK_SEL_CLK_DIS_;
smsc911x_reg_write(pdata, HW_CFG, hwcfg);
udelay(10); /* Enough time for clocks to stop */

/* Switch to external phy */
hwcfg |= HW_CFG_EXT_PHY_EN_;
smsc911x_reg_write(pdata, HW_CFG, hwcfg);

/* Enable phy clocks to the MAC */
hwcfg &= (~HW_CFG_PHY_CLK_SEL_);
hwcfg |= HW_CFG_PHY_CLK_SEL_EXT_PHY_;
smsc911x_reg_write(pdata, HW_CFG, hwcfg);
udelay(10); /* Enough time for clocks to restart */

hwcfg |= HW_CFG_SMI_SEL_;
smsc911x_reg_write(pdata, HW_CFG, hwcfg);
}

/* Autodetects and enables external phy if present on supported chips.
* autodetection can be overridden by specifying SMSC911X_FORCE_INTERNAL_PHY
* or SMSC911X_FORCE_EXTERNAL_PHY in the platform_data flags. */
static void smsc911x_phy_initialise_external(struct smsc911x_data *pdata)
{
unsigned int hwcfg = smsc911x_reg_read(pdata, HW_CFG);

if (pdata->config.flags & SMSC911X_FORCE_INTERNAL_PHY) {
  SMSC_TRACE(pdata, hw, "Forcing internal PHY");
  pdata->using_extphy = 0;
} else if (pdata->config.flags & SMSC911X_FORCE_EXTERNAL_PHY) {
  SMSC_TRACE(pdata, hw, "Forcing external PHY");
  smsc911x_phy_enable_external(pdata);
  pdata->using_extphy = 1;
} else if (hwcfg & HW_CFG_EXT_PHY_DET_) {
  SMSC_TRACE(pdata, hw,
      "HW_CFG EXT_PHY_DET set, using external PHY");
  smsc911x_phy_enable_external(pdata);
  pdata->using_extphy = 1;
} else {
  SMSC_TRACE(pdata, hw,
      "HW_CFG EXT_PHY_DET clear, using internal PHY");
  pdata->using_extphy = 0;
}
}

/* Fetches a tx status out of the status fifo */
static unsigned int smsc911x_tx_get_txstatus(struct smsc911x_data *pdata)
{
unsigned int result =
     smsc911x_reg_read(pdata, TX_FIFO_INF) & TX_FIFO_INF_TSUSED_;

if (result != 0)
  result = smsc911x_reg_read(pdata, TX_STATUS_FIFO);

return result;
}

/* Fetches the next rx status */
static unsigned int smsc911x_rx_get_rxstatus(struct smsc911x_data *pdata)
{
unsigned int result =
     smsc911x_reg_read(pdata, RX_FIFO_INF) & RX_FIFO_INF_RXSUSED_;

if (result != 0)
  result = smsc911x_reg_read(pdata, RX_STATUS_FIFO);

return result;
}

#ifdef USE_PHY_WORK_AROUND
static int smsc911x_phy_check_loopbackpkt(struct smsc911x_data *pdata)
{
unsigned int tries;
u32 wrsz;
u32 rdsz;
ulong bufp;

for (tries = 0; tries < 10; tries++) {
  unsigned int txcmd_a;
  unsigned int txcmd_b;
  unsigned int status;
  unsigned int pktlength;
  unsigned int i;

  /* Zero-out rx packet memory */
  memset(pdata->loopback_rx_pkt, 0, MIN_PACKET_SIZE);

  /* Write tx packet to 118 */
  txcmd_a = (u32)((ulong)pdata->loopback_tx_pkt & 0x03) << 16;
  txcmd_a |= TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
  txcmd_a |= MIN_PACKET_SIZE;

  txcmd_b = MIN_PACKET_SIZE << 16 | MIN_PACKET_SIZE;

  smsc911x_reg_write(pdata, TX_DATA_FIFO, txcmd_a);
  smsc911x_reg_write(pdata, TX_DATA_FIFO, txcmd_b);

  bufp = (ulong)pdata->loopback_tx_pkt & (~0x3);
  wrsz = MIN_PACKET_SIZE + 3;
  wrsz += (u32)((ulong)pdata->loopback_tx_pkt & 0x3);
  wrsz >>= 2;

  pdata->ops->tx_writefifo(pdata, (unsigned int *)bufp, wrsz);

  /* Wait till transmit is done */
  i = 60;
  do {
   udelay(5);
   status = smsc911x_tx_get_txstatus(pdata);
  } while ((i--) && (!status));

  if (!status) {
   SMSC_WARN(pdata, hw,
      "Failed to transmit during loopback test");
   continue;
  }
  if (status & TX_STS_ES_) {
   SMSC_WARN(pdata, hw,
      "Transmit encountered errors during loopback test");
   continue;
  }

  /* Wait till receive is done */
  i = 60;
  do {
   udelay(5);
   status = smsc911x_rx_get_rxstatus(pdata);
  } while ((i--) && (!status));

  if (!status) {
   SMSC_WARN(pdata, hw,
      "Failed to receive during loopback test");
   continue;
  }
  if (status & RX_STS_ES_) {
   SMSC_WARN(pdata, hw,
      "Receive encountered errors during loopback test");
   continue;
  }

  pktlength = ((status & 0x3FFF0000UL) >> 16);
  bufp = (ulong)pdata->loopback_rx_pkt;
  rdsz = pktlength + 3;
  rdsz += (u32)((ulong)pdata->loopback_rx_pkt & 0x3);
  rdsz >>= 2;

  pdata->ops->rx_readfifo(pdata, (unsigned int *)bufp, rdsz);

  if (pktlength != (MIN_PACKET_SIZE + 4)) {
   SMSC_WARN(pdata, hw, "Unexpected packet size "
      "during loop back test, size=%d, will retry",
      pktlength);
  } else {
   unsigned int j;
   int mismatch = 0;
   for (j = 0; j < MIN_PACKET_SIZE; j++) {
    if (pdata->loopback_tx_pkt[j]
        != pdata->loopback_rx_pkt[j]) {
     mismatch = 1;
     break;
    }
   }
   if (!mismatch) {
    SMSC_TRACE(pdata, hw, "Successfully verified "
        "loopback packet");
    return 0;
   } else {
    SMSC_WARN(pdata, hw, "Data mismatch "
       "during loop back test, will retry");
   }
  }
}

return -EIO;
}

static int smsc911x_phy_reset(struct smsc911x_data *pdata)
{
unsigned int temp;
unsigned int i = 100000;

temp = smsc911x_reg_read(pdata, PMT_CTRL);
smsc911x_reg_write(pdata, PMT_CTRL, temp | PMT_CTRL_PHY_RST_);
do {
  msleep(1);
  temp = smsc911x_reg_read(pdata, PMT_CTRL);
} while ((i--) && (temp & PMT_CTRL_PHY_RST_));

if (unlikely(temp & PMT_CTRL_PHY_RST_)) {
  SMSC_WARN(pdata, hw, "PHY reset failed to complete");
  return -EIO;
}
/* Extra delay required because the phy may not be completed with
* its reset when BMCR_RESET is cleared. Specs say 256 uS is
* enough delay but using 1ms here to be safe */
msleep(1);

return 0;
}

static int smsc911x_phy_loopbacktest(struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);
struct phy_device *phy_dev = dev->phydev;
int result = -EIO;
unsigned int i, val;
unsigned long flags;

/* Initialise tx packet using broadcast destination address */
eth_broadcast_addr(pdata->loopback_tx_pkt);

/* Use incrementing source address */
for (i = 6; i < 12; i++)
  pdata->loopback_tx_pkt[i] = (char)i;

/* Set length type field */
pdata->loopback_tx_pkt[12] = 0x00;
pdata->loopback_tx_pkt[13] = 0x00;

for (i = 14; i < MIN_PACKET_SIZE; i++)
  pdata->loopback_tx_pkt[i] = (char)i;

val = smsc911x_reg_read(pdata, HW_CFG);
val &= HW_CFG_TX_FIF_SZ_;
val |= HW_CFG_SF_;
smsc911x_reg_write(pdata, HW_CFG, val);

smsc911x_reg_write(pdata, TX_CFG, TX_CFG_TX_ON_);
smsc911x_reg_write(pdata, RX_CFG,
  (u32)((ulong)pdata->loopback_rx_pkt & 0x03) << 8);

for (i = 0; i < 10; i++) {
  /* Set PHY to 10/FD, no ANEG, and loopback mode */
  smsc911x_mii_write(phy_dev->mdio.bus, phy_dev->mdio.addr,
       MII_BMCR, BMCR_LOOPBACK | BMCR_FULLDPLX);

  /* Enable MAC tx/rx, FD */
  spin_lock_irqsave(&pdata->mac_lock, flags);
  smsc911x_mac_write(pdata, MAC_CR, MAC_CR_FDPX_
       | MAC_CR_TXEN_ | MAC_CR_RXEN_);
  spin_unlock_irqrestore(&pdata->mac_lock, flags);

  if (smsc911x_phy_check_loopbackpkt(pdata) == 0) {
   result = 0;
   break;
  }
  pdata->resetcount++;

  /* Disable MAC rx */
  spin_lock_irqsave(&pdata->mac_lock, flags);
  smsc911x_mac_write(pdata, MAC_CR, 0);
  spin_unlock_irqrestore(&pdata->mac_lock, flags);

  smsc911x_phy_reset(pdata);
}

/* Disable MAC */
spin_lock_irqsave(&pdata->mac_lock, flags);
smsc911x_mac_write(pdata, MAC_CR, 0);
spin_unlock_irqrestore(&pdata->mac_lock, flags);

/* Cancel PHY loopback mode */
smsc911x_mii_write(phy_dev->mdio.bus, phy_dev->mdio.addr, MII_BMCR, 0);

smsc911x_reg_write(pdata, TX_CFG, 0);
smsc911x_reg_write(pdata, RX_CFG, 0);

return result;
}
#endif    /* USE_PHY_WORK_AROUND */

static void smsc911x_phy_update_flowcontrol(struct smsc911x_data *pdata)
{
struct net_device *ndev = pdata->dev;
struct phy_device *phy_dev = ndev->phydev;
u32 afc = smsc911x_reg_read(pdata, AFC_CFG);
u32 flow;
unsigned long flags;

if (phy_dev->duplex == DUPLEX_FULL) {
  u16 lcladv = phy_read(phy_dev, MII_ADVERTISE);
  u16 rmtadv = phy_read(phy_dev, MII_LPA);
  u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);

  if (cap & FLOW_CTRL_RX)
   flow = 0xFFFF0002;
  else
   flow = 0;

  if (cap & FLOW_CTRL_TX)
   afc |= 0xF;
  else
   afc &= ~0xF;

  SMSC_TRACE(pdata, hw, "rx pause %s, tx pause %s",
      (cap & FLOW_CTRL_RX ? "enabled" : "disabled"),
      (cap & FLOW_CTRL_TX ? "enabled" : "disabled"));
} else {
  SMSC_TRACE(pdata, hw, "half duplex");
  flow = 0;
  afc |= 0xF;
}

spin_lock_irqsave(&pdata->mac_lock, flags);
smsc911x_mac_write(pdata, FLOW, flow);
spin_unlock_irqrestore(&pdata->mac_lock, flags);

smsc911x_reg_write(pdata, AFC_CFG, afc);
}

/* Update link mode if anything has changed.  Called periodically when the
* PHY is in polling mode, even if nothing has changed. */
static void smsc911x_phy_adjust_link(struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);
struct phy_device *phy_dev = dev->phydev;
unsigned long flags;
int carrier;

if (phy_dev->duplex != pdata->last_duplex) {
  unsigned int mac_cr;
  SMSC_TRACE(pdata, hw, "duplex state has changed");

  spin_lock_irqsave(&pdata->mac_lock, flags);
  mac_cr = smsc911x_mac_read(pdata, MAC_CR);
  if (phy_dev->duplex) {
   SMSC_TRACE(pdata, hw,
       "configuring for full duplex mode");
   mac_cr |= MAC_CR_FDPX_;
  } else {
   SMSC_TRACE(pdata, hw,
       "configuring for half duplex mode");
   mac_cr &= ~MAC_CR_FDPX_;
  }
  smsc911x_mac_write(pdata, MAC_CR, mac_cr);
  spin_unlock_irqrestore(&pdata->mac_lock, flags);

  smsc911x_phy_update_flowcontrol(pdata);
  pdata->last_duplex = phy_dev->duplex;
}

carrier = netif_carrier_ok(dev);
if (carrier != pdata->last_carrier) {
  SMSC_TRACE(pdata, hw, "carrier state has changed");
  if (carrier) {
   SMSC_TRACE(pdata, hw, "configuring for carrier OK");
   if ((pdata->gpio_orig_setting & GPIO_CFG_LED1_EN_) &&
       (!pdata->using_extphy)) {
    /* Restore original GPIO configuration */
    pdata->gpio_setting = pdata->gpio_orig_setting;
    smsc911x_reg_write(pdata, GPIO_CFG,
     pdata->gpio_setting);
   }
  } else {
   SMSC_TRACE(pdata, hw, "configuring for no carrier");
   /* Check global setting that LED1
* usage is 10/100 indicator */
   pdata->gpio_setting = smsc911x_reg_read(pdata,
    GPIO_CFG);
   if ((pdata->gpio_setting & GPIO_CFG_LED1_EN_) &&
       (!pdata->using_extphy)) {
    /* Force 10/100 LED off, after saving
* original GPIO configuration */
    pdata->gpio_orig_setting = pdata->gpio_setting;

    pdata->gpio_setting &= ~GPIO_CFG_LED1_EN_;
    pdata->gpio_setting |= (GPIO_CFG_GPIOBUF0_
       | GPIO_CFG_GPIODIR0_
       | GPIO_CFG_GPIOD0_);
    smsc911x_reg_write(pdata, GPIO_CFG,
     pdata->gpio_setting);
   }
  }
  pdata->last_carrier = carrier;
}
}

static int smsc911x_mii_probe(struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);
struct phy_device *phydev;
int ret;

/* find the first phy */
phydev = phy_find_first(pdata->mii_bus);
if (!phydev) {
  netdev_err(dev, "no PHY found\n");
  return -ENODEV;
}

SMSC_TRACE(pdata, probe, "PHY: addr %d, phy_id 0x%08X",
     phydev->mdio.addr, phydev->phy_id);

ret = phy_connect_direct(dev, phydev, &smsc911x_phy_adjust_link,
     pdata->config.phy_interface);

if (ret) {
  netdev_err(dev, "Could not attach to PHY\n");
  return ret;
}

phy_attached_info(phydev);

phy_set_max_speed(phydev, SPEED_100);

/* mask with MAC supported features */
phy_support_asym_pause(phydev);

pdata->last_duplex = -1;
pdata->last_carrier = -1;

#ifdef USE_PHY_WORK_AROUND
if (smsc911x_phy_loopbacktest(dev) < 0) {
  SMSC_WARN(pdata, hw, "Failed Loop Back Test");
  phy_disconnect(phydev);
  return -ENODEV;
}
SMSC_TRACE(pdata, hw, "Passed Loop Back Test");
#endif    /* USE_PHY_WORK_AROUND */

SMSC_TRACE(pdata, hw, "phy initialised successfully");
return 0;
}

static int smsc911x_mii_init(struct platform_device *pdev,
        struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);
struct phy_device *phydev;
int err = -ENXIO;

pdata->mii_bus = mdiobus_alloc();
if (!pdata->mii_bus) {
  err = -ENOMEM;
  goto err_out_1;
}

pdata->mii_bus->name = SMSC_MDIONAME;
snprintf(pdata->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
  pdev->name, pdev->id);
pdata->mii_bus->priv = pdata;
pdata->mii_bus->read = smsc911x_mii_read;
pdata->mii_bus->write = smsc911x_mii_write;

pdata->mii_bus->parent = &pdev->dev;

switch (pdata->idrev & 0xFFFF0000) {
case 0x01170000:
case 0x01150000:
case 0x117A0000:
case 0x115A0000:
  /* External PHY supported, try to autodetect */
  smsc911x_phy_initialise_external(pdata);
  break;
default:
  SMSC_TRACE(pdata, hw, "External PHY is not supported, "
      "using internal PHY");
  pdata->using_extphy = 0;
  break;
}

if (!pdata->using_extphy) {
  /* Mask all PHYs except ID 1 (internal) */
  pdata->mii_bus->phy_mask = ~(1 << 1);
}

if (mdiobus_register(pdata->mii_bus)) {
  SMSC_WARN(pdata, probe, "Error registering mii bus");
  goto err_out_free_bus_2;
}

phydev = phy_find_first(pdata->mii_bus);
if (phydev)
  phydev->mac_managed_pm = true;

return 0;

err_out_free_bus_2:
mdiobus_free(pdata->mii_bus);
err_out_1:
return err;
}

/* Gets the number of tx statuses in the fifo */
static unsigned int smsc911x_tx_get_txstatcount(struct smsc911x_data *pdata)
{
return (smsc911x_reg_read(pdata, TX_FIFO_INF)
  & TX_FIFO_INF_TSUSED_) >> 16;
}

/* Reads tx statuses and increments counters where necessary */
static void smsc911x_tx_update_txcounters(struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);
unsigned int tx_stat;

while ((tx_stat = smsc911x_tx_get_txstatus(pdata)) != 0) {
  if (unlikely(tx_stat & 0x80000000)) {
   /* In this driver the packet tag is used as the packet
* length. Since a packet length can never reach the
* size of 0x8000, this bit is reserved. It is worth
* noting that the "reserved bit" in the warning above
* does not reference a hardware defined reserved bit
* but rather a driver defined one.
*/
   SMSC_WARN(pdata, hw, "Packet tag reserved bit is high");
  } else {
   if (unlikely(tx_stat & TX_STS_ES_)) {
    dev->stats.tx_errors++;
   } else {
    dev->stats.tx_packets++;
    dev->stats.tx_bytes += (tx_stat >> 16);
   }
   if (unlikely(tx_stat & TX_STS_EXCESS_COL_)) {
    dev->stats.collisions += 16;
    dev->stats.tx_aborted_errors += 1;
   } else {
    dev->stats.collisions +=
        ((tx_stat >> 3) & 0xF);
   }
   if (unlikely(tx_stat & TX_STS_LOST_CARRIER_))
    dev->stats.tx_carrier_errors += 1;
   if (unlikely(tx_stat & TX_STS_LATE_COL_)) {
    dev->stats.collisions++;
    dev->stats.tx_aborted_errors++;
   }
  }
}
}

/* Increments the Rx error counters */
static void
smsc911x_rx_counterrors(struct net_device *dev, unsigned int rxstat)
{
int crc_err = 0;

if (unlikely(rxstat & RX_STS_ES_)) {
  dev->stats.rx_errors++;
  if (unlikely(rxstat & RX_STS_CRC_ERR_)) {
   dev->stats.rx_crc_errors++;
   crc_err = 1;
  }
}
if (likely(!crc_err)) {
  if (unlikely((rxstat & RX_STS_FRAME_TYPE_) &&
        (rxstat & RX_STS_LENGTH_ERR_)))
   dev->stats.rx_length_errors++;
  if (rxstat & RX_STS_MCAST_)
   dev->stats.multicast++;
}
}

/* Quickly dumps bad packets */
static void
smsc911x_rx_fastforward(struct smsc911x_data *pdata, unsigned int pktwords)
{
if (likely(pktwords >= 4)) {
  unsigned int timeout = 500;
  unsigned int val;
  smsc911x_reg_write(pdata, RX_DP_CTRL, RX_DP_CTRL_RX_FFWD_);
  do {
   udelay(1);
   val = smsc911x_reg_read(pdata, RX_DP_CTRL);
  } while ((val & RX_DP_CTRL_RX_FFWD_) && --timeout);

  if (unlikely(timeout == 0))
   SMSC_WARN(pdata, hw, "Timed out waiting for "
      "RX FFWD to finish, RX_DP_CTRL: 0x%08X", val);
} else {
  while (pktwords--)
   smsc911x_reg_read(pdata, RX_DATA_FIFO);
}
}

/* NAPI poll function */
static int smsc911x_poll(struct napi_struct *napi, int budget)
{
struct smsc911x_data *pdata =
  container_of(napi, struct smsc911x_data, napi);
struct net_device *dev = pdata->dev;
int npackets = 0;

while (npackets < budget) {
  unsigned int pktlength;
  unsigned int pktwords;
  struct sk_buff *skb;
  unsigned int rxstat = smsc911x_rx_get_rxstatus(pdata);

  if (!rxstat) {
   unsigned int temp;
   /* We processed all packets available.  Tell NAPI it can
* stop polling then re-enable rx interrupts */
   smsc911x_reg_write(pdata, INT_STS, INT_STS_RSFL_);
   napi_complete(napi);
   temp = smsc911x_reg_read(pdata, INT_EN);
   temp |= INT_EN_RSFL_EN_;
   smsc911x_reg_write(pdata, INT_EN, temp);
   break;
  }

  /* Count packet for NAPI scheduling, even if it has an error.
* Error packets still require cycles to discard */
  npackets++;

  pktlength = ((rxstat & 0x3FFF0000) >> 16);
  pktwords = (pktlength + NET_IP_ALIGN + 3) >> 2;
  smsc911x_rx_counterrors(dev, rxstat);

  if (unlikely(rxstat & RX_STS_ES_)) {
   SMSC_WARN(pdata, rx_err,
      "Discarding packet with error bit set");
   /* Packet has an error, discard it and continue with
* the next */
   smsc911x_rx_fastforward(pdata, pktwords);
   dev->stats.rx_dropped++;
   continue;
  }

  skb = netdev_alloc_skb(dev, pktwords << 2);
  if (unlikely(!skb)) {
   SMSC_WARN(pdata, rx_err,
      "Unable to allocate skb for rx packet");
   /* Drop the packet and stop this polling iteration */
   smsc911x_rx_fastforward(pdata, pktwords);
   dev->stats.rx_dropped++;
   break;
  }

  pdata->ops->rx_readfifo(pdata,
     (unsigned int *)skb->data, pktwords);

  /* Align IP on 16B boundary */
  skb_reserve(skb, NET_IP_ALIGN);
  skb_put(skb, pktlength - 4);
  skb->protocol = eth_type_trans(skb, dev);
  skb_checksum_none_assert(skb);
  netif_receive_skb(skb);

  /* Update counters */
  dev->stats.rx_packets++;
  dev->stats.rx_bytes += (pktlength - 4);
}

/* Return total received packets */
return npackets;
}

/* Returns hash bit number for given MAC address
* Example:
* 01 00 5E 00 00 01 -> returns bit number 31 */
static unsigned int smsc911x_hash(char addr[ETH_ALEN])
{
return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
}

static void smsc911x_rx_multicast_update(struct smsc911x_data *pdata)
{
/* Performs the multicast & mac_cr update.  This is called when
* safe on the current hardware, and with the mac_lock held */
unsigned int mac_cr;

SMSC_ASSERT_MAC_LOCK(pdata);

mac_cr = smsc911x_mac_read(pdata, MAC_CR);
mac_cr |= pdata->set_bits_mask;
mac_cr &= ~(pdata->clear_bits_mask);
smsc911x_mac_write(pdata, MAC_CR, mac_cr);
smsc911x_mac_write(pdata, HASHH, pdata->hashhi);
smsc911x_mac_write(pdata, HASHL, pdata->hashlo);
SMSC_TRACE(pdata, hw, "maccr 0x%08X, HASHH 0x%08X, HASHL 0x%08X",
     mac_cr, pdata->hashhi, pdata->hashlo);
}

static void smsc911x_rx_multicast_update_workaround(struct smsc911x_data *pdata)
{
unsigned int mac_cr;

/* This function is only called for older LAN911x devices
* (revA or revB), where MAC_CR, HASHH and HASHL should not
* be modified during Rx - newer devices immediately update the
* registers.
*
* This is called from interrupt context */

spin_lock(&pdata->mac_lock);

/* Check Rx has stopped */
if (smsc911x_mac_read(pdata, MAC_CR) & MAC_CR_RXEN_)
  SMSC_WARN(pdata, drv, "Rx not stopped");

/* Perform the update - safe to do now Rx has stopped */
smsc911x_rx_multicast_update(pdata);

/* Re-enable Rx */
mac_cr = smsc911x_mac_read(pdata, MAC_CR);
mac_cr |= MAC_CR_RXEN_;
smsc911x_mac_write(pdata, MAC_CR, mac_cr);

pdata->multicast_update_pending = 0;

spin_unlock(&pdata->mac_lock);
}

static int smsc911x_phy_general_power_up(struct smsc911x_data *pdata)
{
struct net_device *ndev = pdata->dev;
struct phy_device *phy_dev = ndev->phydev;
int rc = 0;

if (!phy_dev)
  return rc;

/* If the internal PHY is in General Power-Down mode, all, except the
* management interface, is powered-down and stays in that condition as
* long as Phy register bit 0.11 is HIGH.
*
* In that case, clear the bit 0.11, so the PHY powers up and we can
* access to the phy registers.
*/
rc = phy_read(phy_dev, MII_BMCR);
if (rc < 0) {
  SMSC_WARN(pdata, drv, "Failed reading PHY control reg");
  return rc;
}

/* If the PHY general power-down bit is not set is not necessary to
* disable the general power down-mode.
*/
if (rc & BMCR_PDOWN) {
  rc = phy_write(phy_dev, MII_BMCR, rc & ~BMCR_PDOWN);
  if (rc < 0) {
   SMSC_WARN(pdata, drv, "Failed writing PHY control reg");
   return rc;
  }

  usleep_range(1000, 1500);
}

return 0;
}

static int smsc911x_phy_disable_energy_detect(struct smsc911x_data *pdata)
{
struct net_device *ndev = pdata->dev;
struct phy_device *phy_dev = ndev->phydev;
int rc = 0;

if (!phy_dev)
  return rc;

rc = phy_read(phy_dev, MII_LAN83C185_CTRL_STATUS);

if (rc < 0) {
  SMSC_WARN(pdata, drv, "Failed reading PHY control reg");
  return rc;
}

/* Only disable if energy detect mode is already enabled */
if (rc & MII_LAN83C185_EDPWRDOWN) {
  /* Disable energy detect mode for this SMSC Transceivers */
  rc = phy_write(phy_dev, MII_LAN83C185_CTRL_STATUS,
          rc & (~MII_LAN83C185_EDPWRDOWN));

  if (rc < 0) {
   SMSC_WARN(pdata, drv, "Failed writing PHY control reg");
   return rc;
  }
  /* Allow PHY to wakeup */
  mdelay(2);
}

return 0;
}

static int smsc911x_phy_enable_energy_detect(struct smsc911x_data *pdata)
{
struct net_device *ndev = pdata->dev;
struct phy_device *phy_dev = ndev->phydev;
int rc = 0;

if (!phy_dev)
  return rc;

rc = phy_read(phy_dev, MII_LAN83C185_CTRL_STATUS);

if (rc < 0) {
  SMSC_WARN(pdata, drv, "Failed reading PHY control reg");
  return rc;
}

/* Only enable if energy detect mode is already disabled */
if (!(rc & MII_LAN83C185_EDPWRDOWN)) {
  /* Enable energy detect mode for this SMSC Transceivers */
  rc = phy_write(phy_dev, MII_LAN83C185_CTRL_STATUS,
          rc | MII_LAN83C185_EDPWRDOWN);

  if (rc < 0) {
   SMSC_WARN(pdata, drv, "Failed writing PHY control reg");
   return rc;
  }
}
return 0;
}

static int smsc911x_soft_reset(struct smsc911x_data *pdata)
{
unsigned int timeout;
unsigned int temp;
int ret;
unsigned int reset_offset = HW_CFG;
unsigned int reset_mask = HW_CFG_SRST_;

/*
* Make sure to power-up the PHY chip before doing a reset, otherwise
* the reset fails.
*/
ret = smsc911x_phy_general_power_up(pdata);
if (ret) {
  SMSC_WARN(pdata, drv, "Failed to power-up the PHY chip");
  return ret;
}

/*
* LAN9210/LAN9211/LAN9220/LAN9221 chips have an internal PHY that
* are initialized in a Energy Detect Power-Down mode that prevents
* the MAC chip to be software reseted. So we have to wakeup the PHY
* before.
*/
if (pdata->generation == 4) {
  ret = smsc911x_phy_disable_energy_detect(pdata);

  if (ret) {
   SMSC_WARN(pdata, drv, "Failed to wakeup the PHY chip");
   return ret;
  }
}

if ((pdata->idrev & 0xFFFF0000) == LAN9250) {
  /* special reset for  LAN9250 */
  reset_offset = RESET_CTL;
  reset_mask = RESET_CTL_DIGITAL_RST_;
}

/* Reset the LAN911x */
smsc911x_reg_write(pdata, reset_offset, reset_mask);

/* verify reset bit is cleared */
timeout = 10;
do {
  udelay(10);
  temp = smsc911x_reg_read(pdata, reset_offset);
} while ((--timeout) && (temp & reset_mask));

if (unlikely(temp & reset_mask)) {
  SMSC_WARN(pdata, drv, "Failed to complete reset");
  return -EIO;
}

if (pdata->generation == 4) {
  ret = smsc911x_phy_enable_energy_detect(pdata);

  if (ret) {
   SMSC_WARN(pdata, drv, "Failed to wakeup the PHY chip");
   return ret;
  }
}

return 0;
}

/* Sets the device MAC address to dev_addr, called with mac_lock held */
static void
smsc911x_set_hw_mac_address(struct smsc911x_data *pdata, const u8 dev_addr[6])
{
u32 mac_high16 = (dev_addr[5] << 8) | dev_addr[4];
u32 mac_low32 = (dev_addr[3] << 24) | (dev_addr[2] << 16) |
     (dev_addr[1] << 8) | dev_addr[0];

SMSC_ASSERT_MAC_LOCK(pdata);

smsc911x_mac_write(pdata, ADDRH, mac_high16);
smsc911x_mac_write(pdata, ADDRL, mac_low32);
}

static void smsc911x_disable_irq_chip(struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);

smsc911x_reg_write(pdata, INT_EN, 0);
smsc911x_reg_write(pdata, INT_STS, 0xFFFFFFFF);
}

static irqreturn_t smsc911x_irqhandler(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct smsc911x_data *pdata = netdev_priv(dev);
u32 intsts = smsc911x_reg_read(pdata, INT_STS);
u32 inten = smsc911x_reg_read(pdata, INT_EN);
int serviced = IRQ_NONE;
u32 temp;

if (unlikely(intsts & inten & INT_STS_SW_INT_)) {
  temp = smsc911x_reg_read(pdata, INT_EN);
  temp &= (~INT_EN_SW_INT_EN_);
  smsc911x_reg_write(pdata, INT_EN, temp);
  smsc911x_reg_write(pdata, INT_STS, INT_STS_SW_INT_);
  pdata->software_irq_signal = 1;
  smp_wmb();
  serviced = IRQ_HANDLED;
}

if (unlikely(intsts & inten & INT_STS_RXSTOP_INT_)) {
  /* Called when there is a multicast update scheduled and
* it is now safe to complete the update */
  SMSC_TRACE(pdata, intr, "RX Stop interrupt");
  smsc911x_reg_write(pdata, INT_STS, INT_STS_RXSTOP_INT_);
  if (pdata->multicast_update_pending)
   smsc911x_rx_multicast_update_workaround(pdata);
  serviced = IRQ_HANDLED;
}

if (intsts & inten & INT_STS_TDFA_) {
  temp = smsc911x_reg_read(pdata, FIFO_INT);
  temp |= FIFO_INT_TX_AVAIL_LEVEL_;
  smsc911x_reg_write(pdata, FIFO_INT, temp);
  smsc911x_reg_write(pdata, INT_STS, INT_STS_TDFA_);
  netif_wake_queue(dev);
  serviced = IRQ_HANDLED;
}

if (unlikely(intsts & inten & INT_STS_RXE_)) {
  SMSC_TRACE(pdata, intr, "RX Error interrupt");
  smsc911x_reg_write(pdata, INT_STS, INT_STS_RXE_);
  serviced = IRQ_HANDLED;
}

if (likely(intsts & inten & INT_STS_RSFL_)) {
  if (likely(napi_schedule_prep(&pdata->napi))) {
   /* Disable Rx interrupts */
   temp = smsc911x_reg_read(pdata, INT_EN);
   temp &= (~INT_EN_RSFL_EN_);
   smsc911x_reg_write(pdata, INT_EN, temp);
   /* Schedule a NAPI poll */
   __napi_schedule(&pdata->napi);
  } else {
   SMSC_WARN(pdata, rx_err, "napi_schedule_prep failed");
  }
  serviced = IRQ_HANDLED;
}

return serviced;
}

static int smsc911x_open(struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);
unsigned int timeout;
unsigned int temp;
unsigned int intcfg;
int retval;
int irq_flags;

pm_runtime_get_sync(dev->dev.parent);

/* find and start the given phy */
if (!dev->phydev) {
  retval = smsc911x_mii_probe(dev);
  if (retval < 0) {
   SMSC_WARN(pdata, probe, "Error starting phy");
   goto out;
  }
}

/* Reset the LAN911x */
retval = smsc911x_soft_reset(pdata);
if (retval) {
  SMSC_WARN(pdata, hw, "soft reset failed");
  goto mii_free_out;
}

smsc911x_reg_write(pdata, HW_CFG, 0x00050000);
smsc911x_reg_write(pdata, AFC_CFG, 0x006E3740);

/* Increase the legal frame size of VLAN tagged frames to 1522 bytes */
spin_lock_irq(&pdata->mac_lock);
smsc911x_mac_write(pdata, VLAN1, ETH_P_8021Q);
spin_unlock_irq(&pdata->mac_lock);

/* Make sure EEPROM has finished loading before setting GPIO_CFG */
timeout = 50;
while ((smsc911x_reg_read(pdata, E2P_CMD) & E2P_CMD_EPC_BUSY_) &&
        --timeout) {
  udelay(10);
}

if (unlikely(timeout == 0))
  SMSC_WARN(pdata, ifup,
     "Timed out waiting for EEPROM busy bit to clear");

smsc911x_reg_write(pdata, GPIO_CFG, 0x70070000);

/* The soft reset above cleared the device's MAC address,
* restore it from local copy (set in probe) */
spin_lock_irq(&pdata->mac_lock);
smsc911x_set_hw_mac_address(pdata, dev->dev_addr);
spin_unlock_irq(&pdata->mac_lock);

/* Initialise irqs, but leave all sources disabled */
smsc911x_disable_irq_chip(dev);

/* Set interrupt deassertion to 100uS */
intcfg = ((10 << 24) | INT_CFG_IRQ_EN_);

if (pdata->config.irq_polarity) {
  SMSC_TRACE(pdata, ifup, "irq polarity: active high");
  intcfg |= INT_CFG_IRQ_POL_;
} else {
  SMSC_TRACE(pdata, ifup, "irq polarity: active low");
}

if (pdata->config.irq_type) {
  SMSC_TRACE(pdata, ifup, "irq type: push-pull");
  intcfg |= INT_CFG_IRQ_TYPE_;
} else {
  SMSC_TRACE(pdata, ifup, "irq type: open drain");
}

smsc911x_reg_write(pdata, INT_CFG, intcfg);

SMSC_TRACE(pdata, ifup, "Testing irq handler using IRQ %d", dev->irq);
pdata->software_irq_signal = 0;
smp_wmb();

irq_flags = irq_get_trigger_type(dev->irq);
retval = request_irq(dev->irq, smsc911x_irqhandler,
        irq_flags | IRQF_SHARED, dev->name, dev);
if (retval) {
  SMSC_WARN(pdata, probe,
     "Unable to claim requested irq: %d", dev->irq);
  goto mii_free_out;
}

temp = smsc911x_reg_read(pdata, INT_EN);
temp |= INT_EN_SW_INT_EN_;
smsc911x_reg_write(pdata, INT_EN, temp);

timeout = 1000;
while (timeout--) {
  if (pdata->software_irq_signal)
   break;
  msleep(1);
}

if (!pdata->software_irq_signal) {
  netdev_warn(dev, "ISR failed signaling test (IRQ %d)\n",
       dev->irq);
  retval = -ENODEV;
  goto irq_stop_out;
}
SMSC_TRACE(pdata, ifup, "IRQ handler passed test using IRQ %d",
     dev->irq);

netdev_info(dev, "SMSC911x/921x identified at %#08lx, IRQ: %d\n",
      (unsigned long)pdata->ioaddr, dev->irq);

/* Reset the last known duplex and carrier */
pdata->last_duplex = -1;
pdata->last_carrier = -1;

/* Bring the PHY up */
phy_start(dev->phydev);

temp = smsc911x_reg_read(pdata, HW_CFG);
/* Preserve TX FIFO size and external PHY configuration */
temp &= (HW_CFG_TX_FIF_SZ_|0x00000FFF);
temp |= HW_CFG_SF_;
smsc911x_reg_write(pdata, HW_CFG, temp);

temp = smsc911x_reg_read(pdata, FIFO_INT);
temp |= FIFO_INT_TX_AVAIL_LEVEL_;
temp &= ~(FIFO_INT_RX_STS_LEVEL_);
smsc911x_reg_write(pdata, FIFO_INT, temp);

/* set RX Data offset to 2 bytes for alignment */
smsc911x_reg_write(pdata, RX_CFG, (NET_IP_ALIGN << 8));

/* enable NAPI polling before enabling RX interrupts */
napi_enable(&pdata->napi);

temp = smsc911x_reg_read(pdata, INT_EN);
temp |= (INT_EN_TDFA_EN_ | INT_EN_RSFL_EN_ | INT_EN_RXSTOP_INT_EN_);
smsc911x_reg_write(pdata, INT_EN, temp);

spin_lock_irq(&pdata->mac_lock);
temp = smsc911x_mac_read(pdata, MAC_CR);
temp |= (MAC_CR_TXEN_ | MAC_CR_RXEN_ | MAC_CR_HBDIS_);
smsc911x_mac_write(pdata, MAC_CR, temp);
spin_unlock_irq(&pdata->mac_lock);

smsc911x_reg_write(pdata, TX_CFG, TX_CFG_TX_ON_);

netif_start_queue(dev);
return 0;

irq_stop_out:
free_irq(dev->irq, dev);
mii_free_out:
phy_disconnect(dev->phydev);
out:
pm_runtime_put(dev->dev.parent);
return retval;
}

/* Entry point for stopping the interface */
static int smsc911x_stop(struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);
unsigned int temp;

/* Disable all device interrupts */
temp = smsc911x_reg_read(pdata, INT_CFG);
temp &= ~INT_CFG_IRQ_EN_;
smsc911x_reg_write(pdata, INT_CFG, temp);

/* Stop Tx and Rx polling */
netif_stop_queue(dev);
napi_disable(&pdata->napi);

/* At this point all Rx and Tx activity is stopped */
dev->stats.rx_dropped += smsc911x_reg_read(pdata, RX_DROP);
smsc911x_tx_update_txcounters(dev);

free_irq(dev->irq, dev);

/* Bring the PHY down */
if (dev->phydev) {
  phy_stop(dev->phydev);
  phy_disconnect(dev->phydev);
}
netif_carrier_off(dev);
pm_runtime_put(dev->dev.parent);

SMSC_TRACE(pdata, ifdown, "Interface stopped");
return 0;
}

/* Entry point for transmitting a packet */
static netdev_tx_t
smsc911x_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);
unsigned int freespace;
unsigned int tx_cmd_a;
unsigned int tx_cmd_b;
unsigned int temp;
u32 wrsz;
ulong bufp;

freespace = smsc911x_reg_read(pdata, TX_FIFO_INF) & TX_FIFO_INF_TDFREE_;

if (unlikely(freespace < TX_FIFO_LOW_THRESHOLD))
  SMSC_WARN(pdata, tx_err,
     "Tx data fifo low, space available: %d", freespace);

/* Word alignment adjustment */
tx_cmd_a = (u32)((ulong)skb->data & 0x03) << 16;
tx_cmd_a |= TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
tx_cmd_a |= (unsigned int)skb->len;

tx_cmd_b = ((unsigned int)skb->len) << 16;
tx_cmd_b |= (unsigned int)skb->len;

smsc911x_reg_write(pdata, TX_DATA_FIFO, tx_cmd_a);
smsc911x_reg_write(pdata, TX_DATA_FIFO, tx_cmd_b);

bufp = (ulong)skb->data & (~0x3);
wrsz = (u32)skb->len + 3;
wrsz += (u32)((ulong)skb->data & 0x3);
wrsz >>= 2;

pdata->ops->tx_writefifo(pdata, (unsigned int *)bufp, wrsz);
freespace -= (skb->len + 32);
skb_tx_timestamp(skb);
dev_consume_skb_any(skb);

if (unlikely(smsc911x_tx_get_txstatcount(pdata) >= 30))
  smsc911x_tx_update_txcounters(dev);

if (freespace < TX_FIFO_LOW_THRESHOLD) {
  netif_stop_queue(dev);
  temp = smsc911x_reg_read(pdata, FIFO_INT);
  temp &= 0x00FFFFFF;
  temp |= 0x32000000;
  smsc911x_reg_write(pdata, FIFO_INT, temp);
}

return NETDEV_TX_OK;
}

/* Entry point for getting status counters */
static struct net_device_stats *smsc911x_get_stats(struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);
smsc911x_tx_update_txcounters(dev);
dev->stats.rx_dropped += smsc911x_reg_read(pdata, RX_DROP);
return &dev->stats;
}

/* Entry point for setting addressing modes */
static void smsc911x_set_multicast_list(struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);
unsigned long flags;

if (dev->flags & IFF_PROMISC) {
  /* Enabling promiscuous mode */
  pdata->set_bits_mask = MAC_CR_PRMS_;
  pdata->clear_bits_mask = (MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
  pdata->hashhi = 0;
  pdata->hashlo = 0;
} else if (dev->flags & IFF_ALLMULTI) {
  /* Enabling all multicast mode */
  pdata->set_bits_mask = MAC_CR_MCPAS_;
  pdata->clear_bits_mask = (MAC_CR_PRMS_ | MAC_CR_HPFILT_);
  pdata->hashhi = 0;
  pdata->hashlo = 0;
} else if (!netdev_mc_empty(dev)) {
  /* Enabling specific multicast addresses */
  unsigned int hash_high = 0;
  unsigned int hash_low = 0;
  struct netdev_hw_addr *ha;

  pdata->set_bits_mask = MAC_CR_HPFILT_;
  pdata->clear_bits_mask = (MAC_CR_PRMS_ | MAC_CR_MCPAS_);

  netdev_for_each_mc_addr(ha, dev) {
   unsigned int bitnum = smsc911x_hash(ha->addr);
   unsigned int mask = 0x01 << (bitnum & 0x1F);

   if (bitnum & 0x20)
    hash_high |= mask;
   else
    hash_low |= mask;
  }

  pdata->hashhi = hash_high;
  pdata->hashlo = hash_low;
} else {
  /* Enabling local MAC address only */
  pdata->set_bits_mask = 0;
  pdata->clear_bits_mask =
      (MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
  pdata->hashhi = 0;
  pdata->hashlo = 0;
}

spin_lock_irqsave(&pdata->mac_lock, flags);

if (pdata->generation <= 1) {
  /* Older hardware revision - cannot change these flags while
* receiving data */
  if (!pdata->multicast_update_pending) {
   unsigned int temp;
   SMSC_TRACE(pdata, hw, "scheduling mcast update");
   pdata->multicast_update_pending = 1;

   /* Request the hardware to stop, then perform the
* update when we get an RX_STOP interrupt */
   temp = smsc911x_mac_read(pdata, MAC_CR);
   temp &= ~(MAC_CR_RXEN_);
   smsc911x_mac_write(pdata, MAC_CR, temp);
  } else {
   /* There is another update pending, this should now
* use the newer values */
  }
} else {
  /* Newer hardware revision - can write immediately */
  smsc911x_rx_multicast_update(pdata);
}

spin_unlock_irqrestore(&pdata->mac_lock, flags);
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void smsc911x_poll_controller(struct net_device *dev)
{
disable_irq(dev->irq);
smsc911x_irqhandler(0, dev);
enable_irq(dev->irq);
}
#endif    /* CONFIG_NET_POLL_CONTROLLER */

static int smsc911x_set_mac_address(struct net_device *dev, void *p)
{
struct smsc911x_data *pdata = netdev_priv(dev);
struct sockaddr *addr = p;

/* On older hardware revisions we cannot change the mac address
* registers while receiving data.  Newer devices can safely change
* this at any time. */
if (pdata->generation <= 1 && netif_running(dev))
  return -EBUSY;

if (!is_valid_ether_addr(addr->sa_data))
  return -EADDRNOTAVAIL;

eth_hw_addr_set(dev, addr->sa_data);

spin_lock_irq(&pdata->mac_lock);
smsc911x_set_hw_mac_address(pdata, dev->dev_addr);
spin_unlock_irq(&pdata->mac_lock);

netdev_info(dev, "MAC Address: %pM\n", dev->dev_addr);

return 0;
}

static void smsc911x_ethtool_getdrvinfo(struct net_device *dev,
     struct ethtool_drvinfo *info)
{
strscpy(info->driver, SMSC_CHIPNAME, sizeof(info->driver));
strscpy(info->version, SMSC_DRV_VERSION, sizeof(info->version));
strscpy(info->bus_info, dev_name(dev->dev.parent),
  sizeof(info->bus_info));
}

static u32 smsc911x_ethtool_getmsglevel(struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);
return pdata->msg_enable;
}

static void smsc911x_ethtool_setmsglevel(struct net_device *dev, u32 level)
{
struct smsc911x_data *pdata = netdev_priv(dev);
pdata->msg_enable = level;
}

static int smsc911x_ethtool_getregslen(struct net_device *dev)
{
return (((E2P_DATA - ID_REV) / 4 + 1) + (WUCSR - MAC_CR) + 1 + 32) *
     sizeof(u32);
}

static void
smsc911x_ethtool_getregs(struct net_device *dev, struct ethtool_regs *regs,
    void *buf)
{
struct smsc911x_data *pdata = netdev_priv(dev);
struct phy_device *phy_dev = dev->phydev;
unsigned long flags;
unsigned int i;
unsigned int j = 0;
u32 *data = buf;

regs->version = pdata->idrev;
for (i = ID_REV; i <= E2P_DATA; i += (sizeof(u32)))
  data[j++] = smsc911x_reg_read(pdata, i);

for (i = MAC_CR; i <= WUCSR; i++) {
  spin_lock_irqsave(&pdata->mac_lock, flags);
  data[j++] = smsc911x_mac_read(pdata, i);
  spin_unlock_irqrestore(&pdata->mac_lock, flags);
}

for (i = 0; i <= 31; i++)
  data[j++] = smsc911x_mii_read(phy_dev->mdio.bus,
           phy_dev->mdio.addr, i);
}

static void smsc911x_eeprom_enable_access(struct smsc911x_data *pdata)
{
unsigned int temp = smsc911x_reg_read(pdata, GPIO_CFG);
temp &= ~GPIO_CFG_EEPR_EN_;
smsc911x_reg_write(pdata, GPIO_CFG, temp);
msleep(1);
}

static int smsc911x_eeprom_send_cmd(struct smsc911x_data *pdata, u32 op)
{
int timeout = 100;
u32 e2cmd;

SMSC_TRACE(pdata, drv, "op 0x%08x", op);
if (smsc911x_reg_read(pdata, E2P_CMD) & E2P_CMD_EPC_BUSY_) {
  SMSC_WARN(pdata, drv, "Busy at start");
  return -EBUSY;
}

e2cmd = op | E2P_CMD_EPC_BUSY_;
smsc911x_reg_write(pdata, E2P_CMD, e2cmd);

do {
  msleep(1);
  e2cmd = smsc911x_reg_read(pdata, E2P_CMD);
} while ((e2cmd & E2P_CMD_EPC_BUSY_) && (--timeout));

if (!timeout) {
  SMSC_TRACE(pdata, drv, "TIMED OUT");
  return -EAGAIN;
}

if (e2cmd & E2P_CMD_EPC_TIMEOUT_) {
  SMSC_TRACE(pdata, drv, "Error occurred during eeprom operation");
  return -EINVAL;
}

return 0;
}

static int smsc911x_eeprom_read_location(struct smsc911x_data *pdata,
      u8 address, u8 *data)
{
u32 op = E2P_CMD_EPC_CMD_READ_ | address;
int ret;

SMSC_TRACE(pdata, drv, "address 0x%x", address);
ret = smsc911x_eeprom_send_cmd(pdata, op);

if (!ret)
  data[address] = smsc911x_reg_read(pdata, E2P_DATA);

return ret;
}

static int smsc911x_eeprom_write_location(struct smsc911x_data *pdata,
       u8 address, u8 data)
{
u32 op = E2P_CMD_EPC_CMD_ERASE_ | address;
int ret;

SMSC_TRACE(pdata, drv, "address 0x%x, data 0x%x", address, data);
ret = smsc911x_eeprom_send_cmd(pdata, op);

if (!ret) {
  op = E2P_CMD_EPC_CMD_WRITE_ | address;
  smsc911x_reg_write(pdata, E2P_DATA, (u32)data);

  /* Workaround for hardware read-after-write restriction */
  smsc911x_reg_read(pdata, BYTE_TEST);

  ret = smsc911x_eeprom_send_cmd(pdata, op);
}

return ret;
}

static int smsc911x_ethtool_get_eeprom_len(struct net_device *dev)
{
return SMSC911X_EEPROM_SIZE;
}

static int smsc911x_ethtool_get_eeprom(struct net_device *dev,
           struct ethtool_eeprom *eeprom, u8 *data)
{
struct smsc911x_data *pdata = netdev_priv(dev);
u8 eeprom_data[SMSC911X_EEPROM_SIZE];
int len;
int i;

smsc911x_eeprom_enable_access(pdata);

len = min(eeprom->len, SMSC911X_EEPROM_SIZE);
for (i = 0; i < len; i++) {
  int ret = smsc911x_eeprom_read_location(pdata, i, eeprom_data);
  if (ret < 0) {
   eeprom->len = 0;
   return ret;
  }
}

memcpy(data, &eeprom_data[eeprom->offset], len);
eeprom->len = len;
return 0;
}

static int smsc911x_ethtool_set_eeprom(struct net_device *dev,
           struct ethtool_eeprom *eeprom, u8 *data)
{
int ret;
struct smsc911x_data *pdata = netdev_priv(dev);

smsc911x_eeprom_enable_access(pdata);
smsc911x_eeprom_send_cmd(pdata, E2P_CMD_EPC_CMD_EWEN_);
ret = smsc911x_eeprom_write_location(pdata, eeprom->offset, *data);
smsc911x_eeprom_send_cmd(pdata, E2P_CMD_EPC_CMD_EWDS_);

/* Single byte write, according to man page */
eeprom->len = 1;

return ret;
}

static const struct ethtool_ops smsc911x_ethtool_ops = {
.get_link = ethtool_op_get_link,
.get_drvinfo = smsc911x_ethtool_getdrvinfo,
.nway_reset = phy_ethtool_nway_reset,
.get_msglevel = smsc911x_ethtool_getmsglevel,
.set_msglevel = smsc911x_ethtool_setmsglevel,
.get_regs_len = smsc911x_ethtool_getregslen,
.get_regs = smsc911x_ethtool_getregs,
.get_eeprom_len = smsc911x_ethtool_get_eeprom_len,
.get_eeprom = smsc911x_ethtool_get_eeprom,
.set_eeprom = smsc911x_ethtool_set_eeprom,
.get_ts_info = ethtool_op_get_ts_info,
.get_link_ksettings = phy_ethtool_get_link_ksettings,
.set_link_ksettings = phy_ethtool_set_link_ksettings,
};

static const struct net_device_ops smsc911x_netdev_ops = {
.ndo_open  = smsc911x_open,
.ndo_stop  = smsc911x_stop,
.ndo_start_xmit  = smsc911x_hard_start_xmit,
.ndo_get_stats  = smsc911x_get_stats,
.ndo_set_rx_mode = smsc911x_set_multicast_list,
.ndo_eth_ioctl  = phy_do_ioctl_running,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address  = smsc911x_set_mac_address,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = smsc911x_poll_controller,
#endif
};

/* copies the current mac address from hardware to dev->dev_addr */
static void smsc911x_read_mac_address(struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);
u32 mac_high16, mac_low32;
u8 addr[ETH_ALEN];

mac_high16 = smsc911x_mac_read(pdata, ADDRH);
mac_low32 = smsc911x_mac_read(pdata, ADDRL);

/* The first mac_read in some setups can incorrectly read 0. Re-read it
* to get the full MAC if this is observed.
*/
if (mac_high16 == 0) {
  SMSC_TRACE(pdata, probe, "Re-read MAC ADDRH\n");
  mac_high16 = smsc911x_mac_read(pdata, ADDRH);
}

addr[0] = (u8)(mac_low32);
addr[1] = (u8)(mac_low32 >> 8);
addr[2] = (u8)(mac_low32 >> 16);
addr[3] = (u8)(mac_low32 >> 24);
addr[4] = (u8)(mac_high16);
addr[5] = (u8)(mac_high16 >> 8);
eth_hw_addr_set(dev, addr);
}

/* Initializing private device structures, only called from probe */
static int smsc911x_init(struct net_device *dev)
{
struct smsc911x_data *pdata = netdev_priv(dev);
unsigned int byte_test, mask;
unsigned int to = 100;

SMSC_TRACE(pdata, probe, "Driver Parameters:");
SMSC_TRACE(pdata, probe, "LAN base: 0x%08lX",
     (unsigned long)pdata->ioaddr);
SMSC_TRACE(pdata, probe, "IRQ: %d", dev->irq);
SMSC_TRACE(pdata, probe, "PHY will be autodetected.");

spin_lock_init(&pdata->dev_lock);
spin_lock_init(&pdata->mac_lock);

if (pdata->ioaddr == NULL) {
  SMSC_WARN(pdata, probe, "pdata->ioaddr: 0x00000000");
  return -ENODEV;
}

/*
* poll the READY bit in PMT_CTRL. Any other access to the device is
* forbidden while this bit isn't set. Try for 100ms
*
* Note that this test is done before the WORD_SWAP register is
* programmed. So in some configurations the READY bit is at 16 before
* WORD_SWAP is written to. This issue is worked around by waiting
* until either bit 0 or bit 16 gets set in PMT_CTRL.
*
* SMSC has confirmed that checking bit 16 (marked as reserved in
* the datasheet) is fine since these bits "will either never be set
* or can only go high after READY does (so also indicate the device
* is ready)".
*/

mask = PMT_CTRL_READY_ | swahw32(PMT_CTRL_READY_);
while (!(smsc911x_reg_read(pdata, PMT_CTRL) & mask) && --to)
  udelay(1000);

if (to == 0) {
  netdev_err(dev, "Device not READY in 100ms aborting\n");
  return -ENODEV;
}

/* Check byte ordering */
byte_test = smsc911x_reg_read(pdata, BYTE_TEST);
SMSC_TRACE(pdata, probe, "BYTE_TEST: 0x%08X", byte_test);
if (byte_test == 0x43218765) {
  SMSC_TRACE(pdata, probe, "BYTE_TEST looks swapped, "
      "applying WORD_SWAP");
  smsc911x_reg_write(pdata, WORD_SWAP, 0xffffffff);

  /* 1 dummy read of BYTE_TEST is needed after a write to
* WORD_SWAP before its contents are valid */
  byte_test = smsc911x_reg_read(pdata, BYTE_TEST);

  byte_test = smsc911x_reg_read(pdata, BYTE_TEST);
}

if (byte_test != 0x87654321) {
  SMSC_WARN(pdata, drv, "BYTE_TEST: 0x%08X", byte_test);
  if (((byte_test >> 16) & 0xFFFF) == (byte_test & 0xFFFF)) {
   SMSC_WARN(pdata, probe,
      "top 16 bits equal to bottom 16 bits");
   SMSC_TRACE(pdata, probe,
       "This may mean the chip is set "
       "for 32 bit while the bus is reading 16 bit");
  }
  return -ENODEV;
}

/* Default generation to zero (all workarounds apply) */
pdata->generation = 0;

pdata->idrev = smsc911x_reg_read(pdata, ID_REV);
switch (pdata->idrev & 0xFFFF0000) {
case LAN9118:
case LAN9117:
case LAN9116:
case LAN9115:
case LAN89218:
  /* LAN911[5678] family */
  pdata->generation = pdata->idrev & 0x0000FFFF;
  break;

case LAN9218:
case LAN9217:
case LAN9216:
case LAN9215:
  /* LAN921[5678] family */
  pdata->generation = 3;
  break;

case LAN9210:
case LAN9211:
case LAN9220:
case LAN9221:
case LAN9250:
  /* LAN9210/LAN9211/LAN9220/LAN9221/LAN9250 */
  pdata->generation = 4;
  break;

default:
  SMSC_WARN(pdata, probe, "LAN911x not identified, idrev: 0x%08X",
     pdata->idrev);
  return -ENODEV;
}

SMSC_TRACE(pdata, probe,
     "LAN911x identified, idrev: 0x%08X, generation: %d",
     pdata->idrev, pdata->generation);

if (pdata->generation == 0)
  SMSC_WARN(pdata, probe,
     "This driver is not intended for this chip revision");

/* workaround for platforms without an eeprom, where the mac address
* is stored elsewhere and set by the bootloader.  This saves the
* mac address before resetting the device */
if (pdata->config.flags & SMSC911X_SAVE_MAC_ADDRESS) {
  spin_lock_irq(&pdata->mac_lock);
  smsc911x_read_mac_address(dev);
  spin_unlock_irq(&pdata->mac_lock);
}

/* Reset the LAN911x */
if (smsc911x_phy_reset(pdata) || smsc911x_soft_reset(pdata))
  return -ENODEV;

dev->flags |= IFF_MULTICAST;
netif_napi_add_weight(dev, &pdata->napi, smsc911x_poll,
         SMSC_NAPI_WEIGHT);
dev->netdev_ops = &smsc911x_netdev_ops;
dev->ethtool_ops = &smsc911x_ethtool_ops;

return 0;
}

static void smsc911x_drv_remove(struct platform_device *pdev)
{
struct net_device *dev;
struct smsc911x_data *pdata;
struct resource *res;

dev = platform_get_drvdata(pdev);
BUG_ON(!dev);
pdata = netdev_priv(dev);
BUG_ON(!pdata);
BUG_ON(!pdata->ioaddr);

SMSC_TRACE(pdata, ifdown, "Stopping driver");

unregister_netdev(dev);

mdiobus_unregister(pdata->mii_bus);
mdiobus_free(pdata->mii_bus);

res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
        "smsc911x-memory");
if (!res)
  res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

release_mem_region(res->start, resource_size(res));

iounmap(pdata->ioaddr);

(void)smsc911x_disable_resources(pdev);
smsc911x_free_resources(pdev);

free_netdev(dev);

pm_runtime_disable(&pdev->dev);
}

/* standard register access */
static const struct smsc911x_ops standard_smsc911x_ops = {
.reg_read = __smsc911x_reg_read,
.reg_write = __smsc911x_reg_write,
.rx_readfifo = smsc911x_rx_readfifo,
.tx_writefifo = smsc911x_tx_writefifo,
};

/* shifted register access */
static const struct smsc911x_ops shifted_smsc911x_ops = {
.reg_read = __smsc911x_reg_read_shift,
.reg_write = __smsc911x_reg_write_shift,
.rx_readfifo = smsc911x_rx_readfifo_shift,
.tx_writefifo = smsc911x_tx_writefifo_shift,
};

static int smsc911x_probe_config(struct smsc911x_platform_config *config,
     struct device *dev)
{
int phy_interface;
u32 width = 0;
int err;

phy_interface = device_get_phy_mode(dev);
if (phy_interface < 0)
  phy_interface = PHY_INTERFACE_MODE_NA;
config->phy_interface = phy_interface;

device_get_mac_address(dev, config->mac);

err = device_property_read_u32(dev, "reg-io-width", &width);
if (err == -ENXIO)
  return err;
if (!err && width == 4)
  config->flags |= SMSC911X_USE_32BIT;
else
  config->flags |= SMSC911X_USE_16BIT;

device_property_read_u32(dev, "reg-shift", &config->shift);

if (device_property_present(dev, "smsc,irq-active-high"))
  config->irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_HIGH;

if (device_property_present(dev, "smsc,irq-push-pull"))
  config->irq_type = SMSC911X_IRQ_TYPE_PUSH_PULL;

if (device_property_present(dev, "smsc,force-internal-phy"))
  config->flags |= SMSC911X_FORCE_INTERNAL_PHY;

if (device_property_present(dev, "smsc,force-external-phy"))
  config->flags |= SMSC911X_FORCE_EXTERNAL_PHY;

if (device_property_present(dev, "smsc,save-mac-address"))
  config->flags |= SMSC911X_SAVE_MAC_ADDRESS;

return 0;
}

static int smsc911x_drv_probe(struct platform_device *pdev)
{
struct net_device *dev;
struct smsc911x_data *pdata;
struct smsc911x_platform_config *config = dev_get_platdata(&pdev->dev);
struct resource *res;
int res_size, irq;
int retval;

res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
        "smsc911x-memory");
if (!res)
  res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
  pr_warn("Could not allocate resource\n");
  retval = -ENODEV;
  goto out_0;
}
res_size = resource_size(res);

irq = platform_get_irq(pdev, 0);
if (irq == -EPROBE_DEFER) {
  retval = -EPROBE_DEFER;
  goto out_0;
} else if (irq < 0) {
  pr_warn("Could not allocate irq resource\n");
  retval = -ENODEV;
  goto out_0;
}

if (!request_mem_region(res->start, res_size, SMSC_CHIPNAME)) {
  retval = -EBUSY;
  goto out_0;
}

dev = alloc_etherdev(sizeof(struct smsc911x_data));
if (!dev) {
  retval = -ENOMEM;
  goto out_release_io_1;
}

SET_NETDEV_DEV(dev, &pdev->dev);

pdata = netdev_priv(dev);
dev->irq = irq;
pdata->ioaddr = ioremap(res->start, res_size);
if (!pdata->ioaddr) {
  retval = -ENOMEM;
  goto out_ioremap_fail;
}

pdata->dev = dev;
pdata->msg_enable = ((1 << debug) - 1);

platform_set_drvdata(pdev, dev);

retval = smsc911x_request_resources(pdev);
if (retval)
--> --------------------

--> maximum size reached

--> --------------------

Messung V0.5

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