text: /***************************************************************************
   *
   * Copyright (C) 2004-2008 SMSC
   * Copyright (C) 2005-2008 ARM
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * of the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
   *
   ***************************************************************************
   * 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
   *
   */
  
  #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/gpio.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_device.h>
  #include <linux/of_gpio.h>
  #include <linux/of_net.h>
  #include "smsc911x.h"
  
  #define SMSC_CHIPNAME		"smsc911x"
  #define SMSC_MDIONAME		"smsc911x-mdio"
  #define SMSC_DRV_VERSION	"2008-10-21"
  
  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 phy_device *phy_dev;
  	struct mii_bus *mii_bus;
  	int phy_irq[PHY_MAX_ADDR];
  	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];
  
  	/* 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)
  		netdev_err(ndev, "couldn't get regulators %d\n",
  				ret);
  
  	/* Request clock */
  	pdata->clk = clk_get(&pdev->dev, NULL);
  	if (IS_ERR(pdata->clk))
  		netdev_warn(ndev, "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 = (struct smsc911x_data *)bus->priv;
  	unsigned long flags;
  	unsigned int addr;
  	int i, reg;
  
  	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);
  	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 = (struct smsc911x_data *)bus->priv;
  	unsigned long flags;
  	unsigned int addr;
  	int i, reg;
  
  	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);
  	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)
  {
  	struct phy_device *phy_dev = pdata->phy_dev;
  	unsigned int temp;
  	unsigned int i = 100000;
  
  	BUG_ON(!phy_dev);
  	BUG_ON(!phy_dev->bus);
  
  	SMSC_TRACE(pdata, hw, "Performing PHY BCR Reset");
  	smsc911x_mii_write(phy_dev->bus, phy_dev->addr, MII_BMCR, BMCR_RESET);
  	do {
  		msleep(1);
  		temp = smsc911x_mii_read(phy_dev->bus, phy_dev->addr,
  			MII_BMCR);
  	} while ((i--) && (temp & BMCR_RESET));
  
  	if (temp & BMCR_RESET) {
  		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 = pdata->phy_dev;
  	int result = -EIO;
  	unsigned int i, val;
  	unsigned long flags;
  
  	/* Initialise tx packet using broadcast destination address */
  	memset(pdata->loopback_tx_pkt, 0xff, ETH_ALEN);
  
  	/* 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->bus, phy_dev->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->bus, phy_dev->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 phy_device *phy_dev = pdata->phy_dev;
  	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 = pdata->phy_dev;
  	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, SMSC_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,
  				SMSC_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, SMSC_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 = NULL;
  	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->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;
  	}
  
  	netdev_info(dev,
  		    "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)\n",
  		    phydev->drv->name, dev_name(&phydev->dev), phydev->irq);
  
  	/* mask with MAC supported features */
  	phydev->supported &= (PHY_BASIC_FEATURES | SUPPORTED_Pause |
  			      SUPPORTED_Asym_Pause);
  	phydev->advertising = phydev->supported;
  
  	pdata->phy_dev = 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");
  		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);
  	int err = -ENXIO, i;
  
  	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->irq = pdata->phy_irq;
  	for (i = 0; i < PHY_MAX_ADDR; ++i)
  		pdata->mii_bus->irq[i] = PHY_POLL;
  
  	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;
  	}
  
  	if (smsc911x_mii_probe(dev) < 0) {
  		SMSC_WARN(pdata, probe, "Error registering mii bus");
  		goto err_out_unregister_bus_3;
  	}
  
  	return 0;
  
  err_out_unregister_bus_3:
  	mdiobus_unregister(pdata->mii_bus);
  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 {
  		unsigned int temp;
  		while (pktwords--)
  			temp = 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_disable_energy_detect(struct smsc911x_data *pdata)
  {
  	int rc = 0;
  
  	if (!pdata->phy_dev)
  		return rc;
  
  	rc = phy_read(pdata->phy_dev, MII_LAN83C185_CTRL_STATUS);
  
  	if (rc < 0) {
  		SMSC_WARN(pdata, drv, "Failed reading PHY control reg");
  		return rc;
  	}
  
  	/*
  	 * If energy is detected the PHY is already awake so is not necessary
  	 * to disable the energy detect power-down mode.
  	 */
  	if ((rc & MII_LAN83C185_EDPWRDOWN) &&
  	    !(rc & MII_LAN83C185_ENERGYON)) {
  		/* Disable energy detect mode for this SMSC Transceivers */
  		rc = phy_write(pdata->phy_dev, MII_LAN83C185_CTRL_STATUS,
  			       rc & (~MII_LAN83C185_EDPWRDOWN));
  
  		if (rc < 0) {
  			SMSC_WARN(pdata, drv, "Failed writing PHY control reg");
  			return rc;
  		}
  
  		mdelay(1);
  	}
  
  	return 0;
  }
  
  static int smsc911x_phy_enable_energy_detect(struct smsc911x_data *pdata)
  {
  	int rc = 0;
  
  	if (!pdata->phy_dev)
  		return rc;
  
  	rc = phy_read(pdata->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)) {
  		mdelay(100);
  		/* Enable energy detect mode for this SMSC Transceivers */
  		rc = phy_write(pdata->phy_dev, MII_LAN83C185_CTRL_STATUS,
  			       rc | MII_LAN83C185_EDPWRDOWN);
  
  		if (rc < 0) {
  			SMSC_WARN(pdata, drv, "Failed writing PHY control reg");
  			return rc;
  		}
  
  		mdelay(1);
  	}
  	return 0;
  }
  
  static int smsc911x_soft_reset(struct smsc911x_data *pdata)
  {
  	unsigned int timeout;
  	unsigned int temp;
  	int 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;
  		}
  	}
  
  	/* Reset the LAN911x */
  	smsc911x_reg_write(pdata, HW_CFG, HW_CFG_SRST_);
  	timeout = 10;
  	do {
  		udelay(10);
  		temp = smsc911x_reg_read(pdata, HW_CFG);
  	} while ((--timeout) && (temp & HW_CFG_SRST_));
  
  	if (unlikely(temp & HW_CFG_SRST_)) {
  		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, 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 int smsc911x_open(struct net_device *dev)
  {
  	struct smsc911x_data *pdata = netdev_priv(dev);
  	unsigned int timeout;
  	unsigned int temp;
  	unsigned int intcfg;
  
  	/* if the phy is not yet registered, retry later*/
  	if (!pdata->phy_dev) {
  		SMSC_WARN(pdata, hw, "phy_dev is NULL");
  		return -EAGAIN;
  	}
  
  	/* Reset the LAN911x */
  	if (smsc911x_soft_reset(pdata)) {
  		SMSC_WARN(pdata, hw, "soft reset failed");
  		return -EIO;
  	}
  
  	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, SMSC_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();
  
  	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);
  		return -ENODEV;
  	}
  	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(pdata->phy_dev);
  
  	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;
  }
  
  /* 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);
  
  	/* Bring the PHY down */
  	if (pdata->phy_dev)
  		phy_stop(pdata->phy_dev);
  
  	SMSC_TRACE(pdata, ifdown, "Interface stopped");
  	return 0;
  }
  
  /* Entry point for transmitting a packet */
  static int 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_kfree_skb(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);
  }
  
  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;
  }
  
  #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;
  
  	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
  
  	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;
  }
  
  /* Standard ioctls for mii-tool */
  static int smsc911x_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
  {
  	struct smsc911x_data *pdata = netdev_priv(dev);
  
  	if (!netif_running(dev) || !pdata->phy_dev)
  		return -EINVAL;
  
  	return phy_mii_ioctl(pdata->phy_dev, ifr, cmd);
  }
  
  static int
  smsc911x_ethtool_getsettings(struct net_device *dev, struct ethtool_cmd *cmd)
  {
  	struct smsc911x_data *pdata = netdev_priv(dev);
  
  	cmd->maxtxpkt = 1;
  	cmd->maxrxpkt = 1;
  	return phy_ethtool_gset(pdata->phy_dev, cmd);
  }
  
  static int
  smsc911x_ethtool_setsettings(struct net_device *dev, struct ethtool_cmd *cmd)
  {
  	struct smsc911x_data *pdata = netdev_priv(dev);
  
  	return phy_ethtool_sset(pdata->phy_dev, cmd);
  }
  
  static void smsc911x_ethtool_getdrvinfo(struct net_device *dev,
  					struct ethtool_drvinfo *info)
  {
  	strlcpy(info->driver, SMSC_CHIPNAME, sizeof(info->driver));
  	strlcpy(info->version, SMSC_DRV_VERSION, sizeof(info->version));
  	strlcpy(info->bus_info, dev_name(dev->dev.parent),
  		sizeof(info->bus_info));
  }
  
  static int smsc911x_ethtool_nwayreset(struct net_device *dev)
  {
  	struct smsc911x_data *pdata = netdev_priv(dev);
  
  	return phy_start_aneg(pdata->phy_dev);
  }
  
  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 = pdata->phy_dev;
  	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->bus, phy_dev->addr, i);
  }
  
  static void smsc911x_eeprom_enable_access(struct smsc911x_data *pdata)
  {
  	unsigned int temp = smsc911x_reg_read(pdata, SMSC_GPIO_CFG);
  	temp &= ~GPIO_CFG_EEPR_EN_;
  	smsc911x_reg_write(pdata, SMSC_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;
  	u32 temp;
  	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 */
  		temp = 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_settings = smsc911x_ethtool_getsettings,
  	.set_settings = smsc911x_ethtool_setsettings,
  	.get_link = ethtool_op_get_link,
  	.get_drvinfo = smsc911x_ethtool_getdrvinfo,
  	.nway_reset = smsc911x_ethtool_nwayreset,
  	.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,
  };
  
  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_do_ioctl		= smsc911x_do_ioctl,
  	.ndo_change_mtu		= eth_change_mtu,
  	.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 = smsc911x_mac_read(pdata, ADDRH);
  	u32 mac_low32 = smsc911x_mac_read(pdata, ADDRL);
  
  	dev->dev_addr[0] = (u8)(mac_low32);
  	dev->dev_addr[1] = (u8)(mac_low32 >> 8);
  	dev->dev_addr[2] = (u8)(mac_low32 >> 16);
  	dev->dev_addr[3] = (u8)(mac_low32 >> 24);
  	dev->dev_addr[4] = (u8)(mac_high16);
  	dev->dev_addr[5] = (u8)(mac_high16 >> 8);
  }
  
  /* 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) {
  		pr_err("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 0x01180000:
  	case 0x01170000:
  	case 0x01160000:
  	case 0x01150000:
  	case 0x218A0000:
  		/* LAN911[5678] family */
  		pdata->generation = pdata->idrev & 0x0000FFFF;
  		break;
  
  	case 0x118A0000:
  	case 0x117A0000:
  	case 0x116A0000:
  	case 0x115A0000:
  		/* LAN921[5678] family */
  		pdata->generation = 3;
  		break;
  
  	case 0x92100000:
  	case 0x92110000:
  	case 0x92200000:
  	case 0x92210000:
  		/* LAN9210/LAN9211/LAN9220/LAN9221 */
  		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_soft_reset(pdata))
  		return -ENODEV;
  
  	ether_setup(dev);
  	dev->flags |= IFF_MULTICAST;
  	netif_napi_add(dev, &pdata->napi, smsc911x_poll, SMSC_NAPI_WEIGHT);
  	dev->netdev_ops = &smsc911x_netdev_ops;
  	dev->ethtool_ops = &smsc911x_ethtool_ops;
  
  	return 0;
  }
  
  static int 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);
  	BUG_ON(!pdata->phy_dev);
  
  	SMSC_TRACE(pdata, ifdown, "Stopping driver");
  
  	if (pdata->config.has_reset_gpio) {
  		gpio_set_value_cansleep(pdata->config.reset_gpio, 0);
  		gpio_free(pdata->config.reset_gpio);
  	}
  
  
  	phy_disconnect(pdata->phy_dev);
  	pdata->phy_dev = NULL;
  	mdiobus_unregister(pdata->mii_bus);
  	mdiobus_free(pdata->mii_bus);
  
  	platform_set_drvdata(pdev, NULL);
  	unregister_netdev(dev);
  	free_irq(dev->irq, dev);
  	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);
  
  	return 0;
  }
  
  /* standard register acces */
  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,
  };
  
  #ifdef CONFIG_OF
  static int smsc911x_probe_config_dt(struct smsc911x_platform_config *config,
  				    struct device_node *np)
  {
  	const char *mac;
  	u32 width = 0;
  
  	if (!np)
  		return -ENODEV;
  
  	config->phy_interface = of_get_phy_mode(np);
  
  	mac = of_get_mac_address(np);
  	if (mac)
  		memcpy(config->mac, mac, ETH_ALEN);
  
  	of_property_read_u32(np, "reg-shift", &config->shift);
  
  	of_property_read_u32(np, "reg-io-width", &width);
  	if (width == 4)
  		config->flags |= SMSC911X_USE_32BIT;
  	else
  		config->flags |= SMSC911X_USE_16BIT;
  
  	if (of_get_property(np, "smsc,irq-active-high", NULL))
  		config->irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_HIGH;
  
  	if (of_get_property(np, "smsc,irq-push-pull", NULL))
  		config->irq_type = SMSC911X_IRQ_TYPE_PUSH_PULL;
  
  	if (of_get_property(np, "smsc,force-internal-phy", NULL))
  		config->flags |= SMSC911X_FORCE_INTERNAL_PHY;
  
  	if (of_get_property(np, "smsc,force-external-phy", NULL))
  		config->flags |= SMSC911X_FORCE_EXTERNAL_PHY;
  
  	if (of_get_property(np, "smsc,save-mac-address", NULL))
  		config->flags |= SMSC911X_SAVE_MAC_ADDRESS;
  
  	return 0;
  }
  #else
  static inline int smsc911x_probe_config_dt(
  				struct smsc911x_platform_config *config,
  				struct device_node *np)
  {
  	return -ENODEV;
  }
  #endif /* CONFIG_OF */
  
  static int smsc911x_drv_probe(struct platform_device *pdev)
  {
  	struct device_node *np = pdev->dev.of_node;
  	struct net_device *dev;
  	struct smsc911x_data *pdata;
  	struct smsc911x_platform_config *config = pdev->dev.platform_data;
  	struct resource *res, *irq_res;
  	unsigned int intcfg = 0;
  	int res_size, irq_flags;
  	int retval;
  
  	pr_info("Driver version %s\n", SMSC_DRV_VERSION);
  
  	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_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  	if (!irq_res) {
  		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_res->start;
  	irq_flags = irq_res->flags & IRQF_TRIGGER_MASK;
  	pdata->ioaddr = ioremap_nocache(res->start, res_size);
  
  	pdata->dev = dev;
  	pdata->msg_enable = ((1 << debug) - 1);
  
  	platform_set_drvdata(pdev, dev);
  
  	retval = smsc911x_request_resources(pdev);
  	if (retval)
  		goto out_request_resources_fail;
  
  	retval = smsc911x_enable_resources(pdev);
  	if (retval)
  		goto out_enable_resources_fail;
  
  	if (pdata->ioaddr == NULL) {
  		SMSC_WARN(pdata, probe, "Error smsc911x base address invalid");
  		retval = -ENOMEM;
  		goto out_disable_resources;
  	}
  
  	retval = smsc911x_probe_config_dt(&pdata->config, np);
  	if (retval && config) {
  		/* copy config parameters across to pdata */
  		memcpy(&pdata->config, config, sizeof(pdata->config));
  		retval = 0;
  	}
  
  	if (retval) {
  		SMSC_WARN(pdata, probe, "Error smsc911x config not found");
  		goto out_disable_resources;
  	}
  
  	/* assume standard, non-shifted, access to HW registers */
  	pdata->ops = &standard_smsc911x_ops;
  	/* apply the right access if shifting is needed */
  	if (pdata->config.shift)
  		pdata->ops = &shifted_smsc911x_ops;
  
  	retval = smsc911x_init(dev);
  	if (retval < 0)
  		goto out_disable_resources;
  
  	/* configure irq polarity and type before connecting isr */
  	if (pdata->config.irq_polarity == SMSC911X_IRQ_POLARITY_ACTIVE_HIGH)
  		intcfg |= INT_CFG_IRQ_POL_;
  
  	if (pdata->config.irq_type == SMSC911X_IRQ_TYPE_PUSH_PULL)
  		intcfg |= INT_CFG_IRQ_TYPE_;
  
  	smsc911x_reg_write(pdata, INT_CFG, intcfg);
  
  	/* Ensure interrupts are globally disabled before connecting ISR */
  	smsc911x_disable_irq_chip(dev);
  
  	retval = request_any_context_irq(dev->irq, smsc911x_irqhandler,
  					 irq_flags | IRQF_SHARED, dev->name,
  					 dev);
  	if (retval < 0) {
  		SMSC_WARN(pdata, probe,
  			  "Unable to claim requested irq: %d", dev->irq);
  		goto out_disable_resources;
  	}
  
  	retval = register_netdev(dev);
  	if (retval) {
  		SMSC_WARN(pdata, probe, "Error %i registering device", retval);
  		goto out_free_irq;
  	} else {
  		SMSC_TRACE(pdata, probe,
  			   "Network interface: \"%s\"", dev->name);
  	}
  
  	retval = smsc911x_mii_init(pdev, dev);
  	if (retval) {
  		SMSC_WARN(pdata, probe, "Error %i initialising mii", retval);
  		goto out_unregister_netdev_5;
  	}
  
  	spin_lock_irq(&pdata->mac_lock);
  
  	/* Check if mac address has been specified when bringing interface up */
  	if (is_valid_ether_addr(dev->dev_addr)) {
  		smsc911x_set_hw_mac_address(pdata, dev->dev_addr);
  		SMSC_TRACE(pdata, probe,
  			   "MAC Address is specified by configuration");
  	} else if (is_valid_ether_addr(pdata->config.mac)) {
  		memcpy(dev->dev_addr, pdata->config.mac, 6);
  		SMSC_TRACE(pdata, probe,
  			   "MAC Address specified by platform data");
  	} else {
  		/* Try reading mac address from device. if EEPROM is present
  		 * it will already have been set */
  		smsc_get_mac(dev);
  
  		if (is_valid_ether_addr(dev->dev_addr)) {
  			/* eeprom values are valid  so use them */
  			SMSC_TRACE(pdata, probe,
  				   "Mac Address is read from LAN911x EEPROM");
  		} else {
  			/* eeprom values are invalid, generate random MAC */
  			eth_hw_addr_random(dev);
  			smsc911x_set_hw_mac_address(pdata, dev->dev_addr);
  			SMSC_TRACE(pdata, probe,
  				   "MAC Address is set to eth_random_addr");
  		}
  	}
  
  	spin_unlock_irq(&pdata->mac_lock);
  
  	netdev_info(dev, "MAC Address: %pM\n", dev->dev_addr);
  
  	return 0;
  
  out_unregister_netdev_5:
  	unregister_netdev(dev);
  out_free_irq:
  	free_irq(dev->irq, dev);
  out_disable_resources:
  	(void)smsc911x_disable_resources(pdev);
  out_enable_resources_fail:
  	smsc911x_free_resources(pdev);
  out_request_resources_fail:
  	platform_set_drvdata(pdev, NULL);
  	iounmap(pdata->ioaddr);
  	free_netdev(dev);
  out_release_io_1:
  	release_mem_region(res->start, resource_size(res));
  out_0:
  	return retval;
  }
  
  #ifdef CONFIG_PM
  /* This implementation assumes the devices remains powered on its VDDVARIO
   * pins during suspend. */
  
  /* TODO: implement freeze/thaw callbacks for hibernation.*/
  
  static int smsc911x_suspend(struct device *dev)
  {
  	struct net_device *ndev = dev_get_drvdata(dev);
  	struct smsc911x_data *pdata = netdev_priv(ndev);
  
  	/* enable wake on LAN, energy detection and the external PME
  	 * signal. */
  	smsc911x_reg_write(pdata, PMT_CTRL,
  		PMT_CTRL_PM_MODE_D1_ | PMT_CTRL_WOL_EN_ |
  		PMT_CTRL_ED_EN_ | PMT_CTRL_PME_EN_);
  
  	/* Drive the GPIO Ethernet_Reset Line low to Suspend */
  	if (pdata->config.has_reset_gpio)
  		gpio_set_value_cansleep(pdata->config.reset_gpio, 0);
  
  	return 0;
  }
  
  static int smsc911x_resume(struct device *dev)
  {
  	struct net_device *ndev = dev_get_drvdata(dev);
  	struct smsc911x_data *pdata = netdev_priv(ndev);
  	unsigned int to = 100;
  
  	if (pdata->config.has_reset_gpio)
  		gpio_set_value_cansleep(pdata->config.reset_gpio, 1);
  
  
  	/* Note 3.11 from the datasheet:
  	 * 	"When the LAN9220 is in a power saving state, a write of any
  	 * 	 data to the BYTE_TEST register will wake-up the device."
  	 */
  	smsc911x_reg_write(pdata, BYTE_TEST, 0);
  
  	/* poll the READY bit in PMT_CTRL. Any other access to the device is
  	 * forbidden while this bit isn't set. Try for 100ms and return -EIO
  	 * if it failed. */
  	while (!(smsc911x_reg_read(pdata, PMT_CTRL) & PMT_CTRL_READY_) && --to)
  		udelay(1000);
  
  	return (to == 0) ? -EIO : 0;
  }
  
  static const struct dev_pm_ops smsc911x_pm_ops = {
  	.suspend	= smsc911x_suspend,
  	.resume		= smsc911x_resume,
  };
  
  #define SMSC911X_PM_OPS (&smsc911x_pm_ops)
  
  #else
  #define SMSC911X_PM_OPS NULL
  #endif
  
  #ifdef CONFIG_OF
  static const struct of_device_id smsc911x_dt_ids[] = {
  	{ .compatible = "smsc,lan9115", },
  	{ /* sentinel */ }
  };
  MODULE_DEVICE_TABLE(of, smsc911x_dt_ids);
  #endif
  
  static struct platform_driver smsc911x_driver = {
  	.probe = smsc911x_drv_probe,
  	.remove = smsc911x_drv_remove,
  	.driver = {
  		.name	= SMSC_CHIPNAME,
  		.owner	= THIS_MODULE,
  		.pm	= SMSC911X_PM_OPS,
  		.of_match_table = of_match_ptr(smsc911x_dt_ids),
  	},
  };
  
  /* Entry point for loading the module */
  static int __init smsc911x_init_module(void)
  {
  	SMSC_INITIALIZE();
  	return platform_driver_register(&smsc911x_driver);
  }
  
  /* entry point for unloading the module */
  static void __exit smsc911x_cleanup_module(void)
  {
  	platform_driver_unregister(&smsc911x_driver);
  }
  
  module_init(smsc911x_init_module);
  module_exit(smsc911x_cleanup_module);
  