Initial import

1 files changed, 1751 insertions, 0 deletions

diff --git a/drivers/net/ethernet/smsc/smsc9420.c b/drivers/net/ethernet/smsc/smsc9420.c
new file mode 100644
index 000000000..4a90cdae5
--- /dev/null
+++ b/drivers/net/ethernet/smsc/smsc9420.c
@@ -0,0 +1,1751 @@
+ /***************************************************************************
+ *
+ * Copyright (C) 2007,2008  SMSC
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ ***************************************************************************
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/phy.h>
+#include <linux/pci.h>
+#include <linux/if_vlan.h>
+#include <linux/dma-mapping.h>
+#include <linux/crc32.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <asm/unaligned.h>
+#include "smsc9420.h"
+
+#define DRV_NAME		"smsc9420"
+#define DRV_MDIONAME		"smsc9420-mdio"
+#define DRV_DESCRIPTION		"SMSC LAN9420 driver"
+#define DRV_VERSION		"1.01"
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+struct smsc9420_dma_desc {
+	u32 status;
+	u32 length;
+	u32 buffer1;
+	u32 buffer2;
+};
+
+struct smsc9420_ring_info {
+	struct sk_buff *skb;
+	dma_addr_t mapping;
+};
+
+struct smsc9420_pdata {
+	void __iomem *ioaddr;
+	struct pci_dev *pdev;
+	struct net_device *dev;
+
+	struct smsc9420_dma_desc *rx_ring;
+	struct smsc9420_dma_desc *tx_ring;
+	struct smsc9420_ring_info *tx_buffers;
+	struct smsc9420_ring_info *rx_buffers;
+	dma_addr_t rx_dma_addr;
+	dma_addr_t tx_dma_addr;
+	int tx_ring_head, tx_ring_tail;
+	int rx_ring_head, rx_ring_tail;
+
+	spinlock_t int_lock;
+	spinlock_t phy_lock;
+
+	struct napi_struct napi;
+
+	bool software_irq_signal;
+	bool rx_csum;
+	u32 msg_enable;
+
+	struct phy_device *phy_dev;
+	struct mii_bus *mii_bus;
+	int phy_irq[PHY_MAX_ADDR];
+	int last_duplex;
+	int last_carrier;
+};
+
+static const struct pci_device_id smsc9420_id_table[] = {
+	{ PCI_VENDOR_ID_9420, PCI_DEVICE_ID_9420, PCI_ANY_ID, PCI_ANY_ID, },
+	{ 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, smsc9420_id_table);
+
+#define SMSC_MSG_DEFAULT (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK)
+
+static uint smsc_debug;
+static uint debug = -1;
+module_param(debug, uint, 0);
+MODULE_PARM_DESC(debug, "debug level");
+
+static inline u32 smsc9420_reg_read(struct smsc9420_pdata *pd, u32 offset)
+{
+	return ioread32(pd->ioaddr + offset);
+}
+
+static inline void
+smsc9420_reg_write(struct smsc9420_pdata *pd, u32 offset, u32 value)
+{
+	iowrite32(value, pd->ioaddr + offset);
+}
+
+static inline void smsc9420_pci_flush_write(struct smsc9420_pdata *pd)
+{
+	/* to ensure PCI write completion, we must perform a PCI read */
+	smsc9420_reg_read(pd, ID_REV);
+}
+
+static int smsc9420_mii_read(struct mii_bus *bus, int phyaddr, int regidx)
+{
+	struct smsc9420_pdata *pd = (struct smsc9420_pdata *)bus->priv;
+	unsigned long flags;
+	u32 addr;
+	int i, reg = -EIO;
+
+	spin_lock_irqsave(&pd->phy_lock, flags);
+
+	/*  confirm MII not busy */
+	if ((smsc9420_reg_read(pd, MII_ACCESS) & MII_ACCESS_MII_BUSY_)) {
+		netif_warn(pd, drv, pd->dev, "MII is busy???\n");
+		goto out;
+	}
+
+	/* set the address, index & direction (read from PHY) */
+	addr = ((phyaddr & 0x1F) << 11) | ((regidx & 0x1F) << 6) |
+		MII_ACCESS_MII_READ_;
+	smsc9420_reg_write(pd, MII_ACCESS, addr);
+
+	/* wait for read to complete with 50us timeout */
+	for (i = 0; i < 5; i++) {
+		if (!(smsc9420_reg_read(pd, MII_ACCESS) &
+			MII_ACCESS_MII_BUSY_)) {
+			reg = (u16)smsc9420_reg_read(pd, MII_DATA);
+			goto out;
+		}
+		udelay(10);
+	}
+
+	netif_warn(pd, drv, pd->dev, "MII busy timeout!\n");
+
+out:
+	spin_unlock_irqrestore(&pd->phy_lock, flags);
+	return reg;
+}
+
+static int smsc9420_mii_write(struct mii_bus *bus, int phyaddr, int regidx,
+			   u16 val)
+{
+	struct smsc9420_pdata *pd = (struct smsc9420_pdata *)bus->priv;
+	unsigned long flags;
+	u32 addr;
+	int i, reg = -EIO;
+
+	spin_lock_irqsave(&pd->phy_lock, flags);
+
+	/* confirm MII not busy */
+	if ((smsc9420_reg_read(pd, MII_ACCESS) & MII_ACCESS_MII_BUSY_)) {
+		netif_warn(pd, drv, pd->dev, "MII is busy???\n");
+		goto out;
+	}
+
+	/* put the data to write in the MAC */
+	smsc9420_reg_write(pd, MII_DATA, (u32)val);
+
+	/* set the address, index & direction (write to PHY) */
+	addr = ((phyaddr & 0x1F) << 11) | ((regidx & 0x1F) << 6) |
+		MII_ACCESS_MII_WRITE_;
+	smsc9420_reg_write(pd, MII_ACCESS, addr);
+
+	/* wait for write to complete with 50us timeout */
+	for (i = 0; i < 5; i++) {
+		if (!(smsc9420_reg_read(pd, MII_ACCESS) &
+			MII_ACCESS_MII_BUSY_)) {
+			reg = 0;
+			goto out;
+		}
+		udelay(10);
+	}
+
+	netif_warn(pd, drv, pd->dev, "MII busy timeout!\n");
+
+out:
+	spin_unlock_irqrestore(&pd->phy_lock, flags);
+	return reg;
+}
+
+/* Returns hash bit number for given MAC address
+ * Example:
+ * 01 00 5E 00 00 01 -> returns bit number 31 */
+static u32 smsc9420_hash(u8 addr[ETH_ALEN])
+{
+	return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
+}
+
+static int smsc9420_eeprom_reload(struct smsc9420_pdata *pd)
+{
+	int timeout = 100000;
+
+	BUG_ON(!pd);
+
+	if (smsc9420_reg_read(pd, E2P_CMD) & E2P_CMD_EPC_BUSY_) {
+		netif_dbg(pd, drv, pd->dev, "%s: Eeprom busy\n", __func__);
+		return -EIO;
+	}
+
+	smsc9420_reg_write(pd, E2P_CMD,
+		(E2P_CMD_EPC_BUSY_ | E2P_CMD_EPC_CMD_RELOAD_));
+
+	do {
+		udelay(10);
+		if (!(smsc9420_reg_read(pd, E2P_CMD) & E2P_CMD_EPC_BUSY_))
+			return 0;
+	} while (timeout--);
+
+	netif_warn(pd, drv, pd->dev, "%s: Eeprom timed out\n", __func__);
+	return -EIO;
+}
+
+/* Standard ioctls for mii-tool */
+static int smsc9420_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+
+	if (!netif_running(dev) || !pd->phy_dev)
+		return -EINVAL;
+
+	return phy_mii_ioctl(pd->phy_dev, ifr, cmd);
+}
+
+static int smsc9420_ethtool_get_settings(struct net_device *dev,
+					 struct ethtool_cmd *cmd)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+
+	if (!pd->phy_dev)
+		return -ENODEV;
+
+	cmd->maxtxpkt = 1;
+	cmd->maxrxpkt = 1;
+	return phy_ethtool_gset(pd->phy_dev, cmd);
+}
+
+static int smsc9420_ethtool_set_settings(struct net_device *dev,
+					 struct ethtool_cmd *cmd)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+
+	if (!pd->phy_dev)
+		return -ENODEV;
+
+	return phy_ethtool_sset(pd->phy_dev, cmd);
+}
+
+static void smsc9420_ethtool_get_drvinfo(struct net_device *netdev,
+					 struct ethtool_drvinfo *drvinfo)
+{
+	struct smsc9420_pdata *pd = netdev_priv(netdev);
+
+	strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
+	strlcpy(drvinfo->bus_info, pci_name(pd->pdev),
+		sizeof(drvinfo->bus_info));
+	strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
+}
+
+static u32 smsc9420_ethtool_get_msglevel(struct net_device *netdev)
+{
+	struct smsc9420_pdata *pd = netdev_priv(netdev);
+	return pd->msg_enable;
+}
+
+static void smsc9420_ethtool_set_msglevel(struct net_device *netdev, u32 data)
+{
+	struct smsc9420_pdata *pd = netdev_priv(netdev);
+	pd->msg_enable = data;
+}
+
+static int smsc9420_ethtool_nway_reset(struct net_device *netdev)
+{
+	struct smsc9420_pdata *pd = netdev_priv(netdev);
+
+	if (!pd->phy_dev)
+		return -ENODEV;
+
+	return phy_start_aneg(pd->phy_dev);
+}
+
+static int smsc9420_ethtool_getregslen(struct net_device *dev)
+{
+	/* all smsc9420 registers plus all phy registers */
+	return 0x100 + (32 * sizeof(u32));
+}
+
+static void
+smsc9420_ethtool_getregs(struct net_device *dev, struct ethtool_regs *regs,
+			 void *buf)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+	struct phy_device *phy_dev = pd->phy_dev;
+	unsigned int i, j = 0;
+	u32 *data = buf;
+
+	regs->version = smsc9420_reg_read(pd, ID_REV);
+	for (i = 0; i < 0x100; i += (sizeof(u32)))
+		data[j++] = smsc9420_reg_read(pd, i);
+
+	// cannot read phy registers if the net device is down
+	if (!phy_dev)
+		return;
+
+	for (i = 0; i <= 31; i++)
+		data[j++] = smsc9420_mii_read(phy_dev->bus, phy_dev->addr, i);
+}
+
+static void smsc9420_eeprom_enable_access(struct smsc9420_pdata *pd)
+{
+	unsigned int temp = smsc9420_reg_read(pd, GPIO_CFG);
+	temp &= ~GPIO_CFG_EEPR_EN_;
+	smsc9420_reg_write(pd, GPIO_CFG, temp);
+	msleep(1);
+}
+
+static int smsc9420_eeprom_send_cmd(struct smsc9420_pdata *pd, u32 op)
+{
+	int timeout = 100;
+	u32 e2cmd;
+
+	netif_dbg(pd, hw, pd->dev, "op 0x%08x\n", op);
+	if (smsc9420_reg_read(pd, E2P_CMD) & E2P_CMD_EPC_BUSY_) {
+		netif_warn(pd, hw, pd->dev, "Busy at start\n");
+		return -EBUSY;
+	}
+
+	e2cmd = op | E2P_CMD_EPC_BUSY_;
+	smsc9420_reg_write(pd, E2P_CMD, e2cmd);
+
+	do {
+		msleep(1);
+		e2cmd = smsc9420_reg_read(pd, E2P_CMD);
+	} while ((e2cmd & E2P_CMD_EPC_BUSY_) && (--timeout));
+
+	if (!timeout) {
+		netif_info(pd, hw, pd->dev, "TIMED OUT\n");
+		return -EAGAIN;
+	}
+
+	if (e2cmd & E2P_CMD_EPC_TIMEOUT_) {
+		netif_info(pd, hw, pd->dev,
+			   "Error occurred during eeprom operation\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int smsc9420_eeprom_read_location(struct smsc9420_pdata *pd,
+					 u8 address, u8 *data)
+{
+	u32 op = E2P_CMD_EPC_CMD_READ_ | address;
+	int ret;
+
+	netif_dbg(pd, hw, pd->dev, "address 0x%x\n", address);
+	ret = smsc9420_eeprom_send_cmd(pd, op);
+
+	if (!ret)
+		data[address] = smsc9420_reg_read(pd, E2P_DATA);
+
+	return ret;
+}
+
+static int smsc9420_eeprom_write_location(struct smsc9420_pdata *pd,
+					  u8 address, u8 data)
+{
+	u32 op = E2P_CMD_EPC_CMD_ERASE_ | address;
+	int ret;
+
+	netif_dbg(pd, hw, pd->dev, "address 0x%x, data 0x%x\n", address, data);
+	ret = smsc9420_eeprom_send_cmd(pd, op);
+
+	if (!ret) {
+		op = E2P_CMD_EPC_CMD_WRITE_ | address;
+		smsc9420_reg_write(pd, E2P_DATA, (u32)data);
+		ret = smsc9420_eeprom_send_cmd(pd, op);
+	}
+
+	return ret;
+}
+
+static int smsc9420_ethtool_get_eeprom_len(struct net_device *dev)
+{
+	return SMSC9420_EEPROM_SIZE;
+}
+
+static int smsc9420_ethtool_get_eeprom(struct net_device *dev,
+				       struct ethtool_eeprom *eeprom, u8 *data)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+	u8 eeprom_data[SMSC9420_EEPROM_SIZE];
+	int len, i;
+
+	smsc9420_eeprom_enable_access(pd);
+
+	len = min(eeprom->len, SMSC9420_EEPROM_SIZE);
+	for (i = 0; i < len; i++) {
+		int ret = smsc9420_eeprom_read_location(pd, i, eeprom_data);
+		if (ret < 0) {
+			eeprom->len = 0;
+			return ret;
+		}
+	}
+
+	memcpy(data, &eeprom_data[eeprom->offset], len);
+	eeprom->magic = SMSC9420_EEPROM_MAGIC;
+	eeprom->len = len;
+	return 0;
+}
+
+static int smsc9420_ethtool_set_eeprom(struct net_device *dev,
+				       struct ethtool_eeprom *eeprom, u8 *data)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+	int ret;
+
+	if (eeprom->magic != SMSC9420_EEPROM_MAGIC)
+		return -EINVAL;
+
+	smsc9420_eeprom_enable_access(pd);
+	smsc9420_eeprom_send_cmd(pd, E2P_CMD_EPC_CMD_EWEN_);
+	ret = smsc9420_eeprom_write_location(pd, eeprom->offset, *data);
+	smsc9420_eeprom_send_cmd(pd, E2P_CMD_EPC_CMD_EWDS_);
+
+	/* Single byte write, according to man page */
+	eeprom->len = 1;
+
+	return ret;
+}
+
+static const struct ethtool_ops smsc9420_ethtool_ops = {
+	.get_settings = smsc9420_ethtool_get_settings,
+	.set_settings = smsc9420_ethtool_set_settings,
+	.get_drvinfo = smsc9420_ethtool_get_drvinfo,
+	.get_msglevel = smsc9420_ethtool_get_msglevel,
+	.set_msglevel = smsc9420_ethtool_set_msglevel,
+	.nway_reset = smsc9420_ethtool_nway_reset,
+	.get_link = ethtool_op_get_link,
+	.get_eeprom_len = smsc9420_ethtool_get_eeprom_len,
+	.get_eeprom = smsc9420_ethtool_get_eeprom,
+	.set_eeprom = smsc9420_ethtool_set_eeprom,
+	.get_regs_len = smsc9420_ethtool_getregslen,
+	.get_regs = smsc9420_ethtool_getregs,
+	.get_ts_info = ethtool_op_get_ts_info,
+};
+
+/* Sets the device MAC address to dev_addr */
+static void smsc9420_set_mac_address(struct net_device *dev)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+	u8 *dev_addr = dev->dev_addr;
+	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];
+
+	smsc9420_reg_write(pd, ADDRH, mac_high16);
+	smsc9420_reg_write(pd, ADDRL, mac_low32);
+}
+
+static void smsc9420_check_mac_address(struct net_device *dev)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+
+	/* Check if mac address has been specified when bringing interface up */
+	if (is_valid_ether_addr(dev->dev_addr)) {
+		smsc9420_set_mac_address(dev);
+		netif_dbg(pd, probe, pd->dev,
+			  "MAC Address is specified by configuration\n");
+	} else {
+		/* Try reading mac address from device. if EEPROM is present
+		 * it will already have been set */
+		u32 mac_high16 = smsc9420_reg_read(pd, ADDRH);
+		u32 mac_low32 = smsc9420_reg_read(pd, 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);
+
+		if (is_valid_ether_addr(dev->dev_addr)) {
+			/* eeprom values are valid  so use them */
+			netif_dbg(pd, probe, pd->dev,
+				  "Mac Address is read from EEPROM\n");
+		} else {
+			/* eeprom values are invalid, generate random MAC */
+			eth_hw_addr_random(dev);
+			smsc9420_set_mac_address(dev);
+			netif_dbg(pd, probe, pd->dev,
+				  "MAC Address is set to random\n");
+		}
+	}
+}
+
+static void smsc9420_stop_tx(struct smsc9420_pdata *pd)
+{
+	u32 dmac_control, mac_cr, dma_intr_ena;
+	int timeout = 1000;
+
+	/* disable TX DMAC */
+	dmac_control = smsc9420_reg_read(pd, DMAC_CONTROL);
+	dmac_control &= (~DMAC_CONTROL_ST_);
+	smsc9420_reg_write(pd, DMAC_CONTROL, dmac_control);
+
+	/* Wait max 10ms for transmit process to stop */
+	while (--timeout) {
+		if (smsc9420_reg_read(pd, DMAC_STATUS) & DMAC_STS_TS_)
+			break;
+		udelay(10);
+	}
+
+	if (!timeout)
+		netif_warn(pd, ifdown, pd->dev, "TX DMAC failed to stop\n");
+
+	/* ACK Tx DMAC stop bit */
+	smsc9420_reg_write(pd, DMAC_STATUS, DMAC_STS_TXPS_);
+
+	/* mask TX DMAC interrupts */
+	dma_intr_ena = smsc9420_reg_read(pd, DMAC_INTR_ENA);
+	dma_intr_ena &= ~(DMAC_INTR_ENA_TX_);
+	smsc9420_reg_write(pd, DMAC_INTR_ENA, dma_intr_ena);
+	smsc9420_pci_flush_write(pd);
+
+	/* stop MAC TX */
+	mac_cr = smsc9420_reg_read(pd, MAC_CR) & (~MAC_CR_TXEN_);
+	smsc9420_reg_write(pd, MAC_CR, mac_cr);
+	smsc9420_pci_flush_write(pd);
+}
+
+static void smsc9420_free_tx_ring(struct smsc9420_pdata *pd)
+{
+	int i;
+
+	BUG_ON(!pd->tx_ring);
+
+	if (!pd->tx_buffers)
+		return;
+
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		struct sk_buff *skb = pd->tx_buffers[i].skb;
+
+		if (skb) {
+			BUG_ON(!pd->tx_buffers[i].mapping);
+			pci_unmap_single(pd->pdev, pd->tx_buffers[i].mapping,
+					 skb->len, PCI_DMA_TODEVICE);
+			dev_kfree_skb_any(skb);
+		}
+
+		pd->tx_ring[i].status = 0;
+		pd->tx_ring[i].length = 0;
+		pd->tx_ring[i].buffer1 = 0;
+		pd->tx_ring[i].buffer2 = 0;
+	}
+	wmb();
+
+	kfree(pd->tx_buffers);
+	pd->tx_buffers = NULL;
+
+	pd->tx_ring_head = 0;
+	pd->tx_ring_tail = 0;
+}
+
+static void smsc9420_free_rx_ring(struct smsc9420_pdata *pd)
+{
+	int i;
+
+	BUG_ON(!pd->rx_ring);
+
+	if (!pd->rx_buffers)
+		return;
+
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		if (pd->rx_buffers[i].skb)
+			dev_kfree_skb_any(pd->rx_buffers[i].skb);
+
+		if (pd->rx_buffers[i].mapping)
+			pci_unmap_single(pd->pdev, pd->rx_buffers[i].mapping,
+				PKT_BUF_SZ, PCI_DMA_FROMDEVICE);
+
+		pd->rx_ring[i].status = 0;
+		pd->rx_ring[i].length = 0;
+		pd->rx_ring[i].buffer1 = 0;
+		pd->rx_ring[i].buffer2 = 0;
+	}
+	wmb();
+
+	kfree(pd->rx_buffers);
+	pd->rx_buffers = NULL;
+
+	pd->rx_ring_head = 0;
+	pd->rx_ring_tail = 0;
+}
+
+static void smsc9420_stop_rx(struct smsc9420_pdata *pd)
+{
+	int timeout = 1000;
+	u32 mac_cr, dmac_control, dma_intr_ena;
+
+	/* mask RX DMAC interrupts */
+	dma_intr_ena = smsc9420_reg_read(pd, DMAC_INTR_ENA);
+	dma_intr_ena &= (~DMAC_INTR_ENA_RX_);
+	smsc9420_reg_write(pd, DMAC_INTR_ENA, dma_intr_ena);
+	smsc9420_pci_flush_write(pd);
+
+	/* stop RX MAC prior to stoping DMA */
+	mac_cr = smsc9420_reg_read(pd, MAC_CR) & (~MAC_CR_RXEN_);
+	smsc9420_reg_write(pd, MAC_CR, mac_cr);
+	smsc9420_pci_flush_write(pd);
+
+	/* stop RX DMAC */
+	dmac_control = smsc9420_reg_read(pd, DMAC_CONTROL);
+	dmac_control &= (~DMAC_CONTROL_SR_);
+	smsc9420_reg_write(pd, DMAC_CONTROL, dmac_control);
+	smsc9420_pci_flush_write(pd);
+
+	/* wait up to 10ms for receive to stop */
+	while (--timeout) {
+		if (smsc9420_reg_read(pd, DMAC_STATUS) & DMAC_STS_RS_)
+			break;
+		udelay(10);
+	}
+
+	if (!timeout)
+		netif_warn(pd, ifdown, pd->dev,
+			   "RX DMAC did not stop! timeout\n");
+
+	/* ACK the Rx DMAC stop bit */
+	smsc9420_reg_write(pd, DMAC_STATUS, DMAC_STS_RXPS_);
+}
+
+static irqreturn_t smsc9420_isr(int irq, void *dev_id)
+{
+	struct smsc9420_pdata *pd = dev_id;
+	u32 int_cfg, int_sts, int_ctl;
+	irqreturn_t ret = IRQ_NONE;
+	ulong flags;
+
+	BUG_ON(!pd);
+	BUG_ON(!pd->ioaddr);
+
+	int_cfg = smsc9420_reg_read(pd, INT_CFG);
+
+	/* check if it's our interrupt */
+	if ((int_cfg & (INT_CFG_IRQ_EN_ | INT_CFG_IRQ_INT_)) !=
+	    (INT_CFG_IRQ_EN_ | INT_CFG_IRQ_INT_))
+		return IRQ_NONE;
+
+	int_sts = smsc9420_reg_read(pd, INT_STAT);
+
+	if (likely(INT_STAT_DMAC_INT_ & int_sts)) {
+		u32 status = smsc9420_reg_read(pd, DMAC_STATUS);
+		u32 ints_to_clear = 0;
+
+		if (status & DMAC_STS_TX_) {
+			ints_to_clear |= (DMAC_STS_TX_ | DMAC_STS_NIS_);
+			netif_wake_queue(pd->dev);
+		}
+
+		if (status & DMAC_STS_RX_) {
+			/* mask RX DMAC interrupts */
+			u32 dma_intr_ena = smsc9420_reg_read(pd, DMAC_INTR_ENA);
+			dma_intr_ena &= (~DMAC_INTR_ENA_RX_);
+			smsc9420_reg_write(pd, DMAC_INTR_ENA, dma_intr_ena);
+			smsc9420_pci_flush_write(pd);
+
+			ints_to_clear |= (DMAC_STS_RX_ | DMAC_STS_NIS_);
+			napi_schedule(&pd->napi);
+		}
+
+		if (ints_to_clear)
+			smsc9420_reg_write(pd, DMAC_STATUS, ints_to_clear);
+
+		ret = IRQ_HANDLED;
+	}
+
+	if (unlikely(INT_STAT_SW_INT_ & int_sts)) {
+		/* mask software interrupt */
+		spin_lock_irqsave(&pd->int_lock, flags);
+		int_ctl = smsc9420_reg_read(pd, INT_CTL);
+		int_ctl &= (~INT_CTL_SW_INT_EN_);
+		smsc9420_reg_write(pd, INT_CTL, int_ctl);
+		spin_unlock_irqrestore(&pd->int_lock, flags);
+
+		smsc9420_reg_write(pd, INT_STAT, INT_STAT_SW_INT_);
+		pd->software_irq_signal = true;
+		smp_wmb();
+
+		ret = IRQ_HANDLED;
+	}
+
+	/* to ensure PCI write completion, we must perform a PCI read */
+	smsc9420_pci_flush_write(pd);
+
+	return ret;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void smsc9420_poll_controller(struct net_device *dev)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+	const int irq = pd->pdev->irq;
+
+	disable_irq(irq);
+	smsc9420_isr(0, dev);
+	enable_irq(irq);
+}
+#endif /* CONFIG_NET_POLL_CONTROLLER */
+
+static void smsc9420_dmac_soft_reset(struct smsc9420_pdata *pd)
+{
+	smsc9420_reg_write(pd, BUS_MODE, BUS_MODE_SWR_);
+	smsc9420_reg_read(pd, BUS_MODE);
+	udelay(2);
+	if (smsc9420_reg_read(pd, BUS_MODE) & BUS_MODE_SWR_)
+		netif_warn(pd, drv, pd->dev, "Software reset not cleared\n");
+}
+
+static int smsc9420_stop(struct net_device *dev)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+	u32 int_cfg;
+	ulong flags;
+
+	BUG_ON(!pd);
+	BUG_ON(!pd->phy_dev);
+
+	/* disable master interrupt */
+	spin_lock_irqsave(&pd->int_lock, flags);
+	int_cfg = smsc9420_reg_read(pd, INT_CFG) & (~INT_CFG_IRQ_EN_);
+	smsc9420_reg_write(pd, INT_CFG, int_cfg);
+	spin_unlock_irqrestore(&pd->int_lock, flags);
+
+	netif_tx_disable(dev);
+	napi_disable(&pd->napi);
+
+	smsc9420_stop_tx(pd);
+	smsc9420_free_tx_ring(pd);
+
+	smsc9420_stop_rx(pd);
+	smsc9420_free_rx_ring(pd);
+
+	free_irq(pd->pdev->irq, pd);
+
+	smsc9420_dmac_soft_reset(pd);
+
+	phy_stop(pd->phy_dev);
+
+	phy_disconnect(pd->phy_dev);
+	pd->phy_dev = NULL;
+	mdiobus_unregister(pd->mii_bus);
+	mdiobus_free(pd->mii_bus);
+
+	return 0;
+}
+
+static void smsc9420_rx_count_stats(struct net_device *dev, u32 desc_status)
+{
+	if (unlikely(desc_status & RDES0_ERROR_SUMMARY_)) {
+		dev->stats.rx_errors++;
+		if (desc_status & RDES0_DESCRIPTOR_ERROR_)
+			dev->stats.rx_over_errors++;
+		else if (desc_status & (RDES0_FRAME_TOO_LONG_ |
+			RDES0_RUNT_FRAME_ | RDES0_COLLISION_SEEN_))
+			dev->stats.rx_frame_errors++;
+		else if (desc_status & RDES0_CRC_ERROR_)
+			dev->stats.rx_crc_errors++;
+	}
+
+	if (unlikely(desc_status & RDES0_LENGTH_ERROR_))
+		dev->stats.rx_length_errors++;
+
+	if (unlikely(!((desc_status & RDES0_LAST_DESCRIPTOR_) &&
+		(desc_status & RDES0_FIRST_DESCRIPTOR_))))
+		dev->stats.rx_length_errors++;
+
+	if (desc_status & RDES0_MULTICAST_FRAME_)
+		dev->stats.multicast++;
+}
+
+static void smsc9420_rx_handoff(struct smsc9420_pdata *pd, const int index,
+				const u32 status)
+{
+	struct net_device *dev = pd->dev;
+	struct sk_buff *skb;
+	u16 packet_length = (status & RDES0_FRAME_LENGTH_MASK_)
+		>> RDES0_FRAME_LENGTH_SHFT_;
+
+	/* remove crc from packet lendth */
+	packet_length -= 4;
+
+	if (pd->rx_csum)
+		packet_length -= 2;
+
+	dev->stats.rx_packets++;
+	dev->stats.rx_bytes += packet_length;
+
+	pci_unmap_single(pd->pdev, pd->rx_buffers[index].mapping,
+		PKT_BUF_SZ, PCI_DMA_FROMDEVICE);
+	pd->rx_buffers[index].mapping = 0;
+
+	skb = pd->rx_buffers[index].skb;
+	pd->rx_buffers[index].skb = NULL;
+
+	if (pd->rx_csum) {
+		u16 hw_csum = get_unaligned_le16(skb_tail_pointer(skb) +
+			NET_IP_ALIGN + packet_length + 4);
+		put_unaligned_le16(hw_csum, &skb->csum);
+		skb->ip_summed = CHECKSUM_COMPLETE;
+	}
+
+	skb_reserve(skb, NET_IP_ALIGN);
+	skb_put(skb, packet_length);
+
+	skb->protocol = eth_type_trans(skb, dev);
+
+	netif_receive_skb(skb);
+}
+
+static int smsc9420_alloc_rx_buffer(struct smsc9420_pdata *pd, int index)
+{
+	struct sk_buff *skb = netdev_alloc_skb(pd->dev, PKT_BUF_SZ);
+	dma_addr_t mapping;
+
+	BUG_ON(pd->rx_buffers[index].skb);
+	BUG_ON(pd->rx_buffers[index].mapping);
+
+	if (unlikely(!skb))
+		return -ENOMEM;
+
+	mapping = pci_map_single(pd->pdev, skb_tail_pointer(skb),
+				 PKT_BUF_SZ, PCI_DMA_FROMDEVICE);
+	if (pci_dma_mapping_error(pd->pdev, mapping)) {
+		dev_kfree_skb_any(skb);
+		netif_warn(pd, rx_err, pd->dev, "pci_map_single failed!\n");
+		return -ENOMEM;
+	}
+
+	pd->rx_buffers[index].skb = skb;
+	pd->rx_buffers[index].mapping = mapping;
+	pd->rx_ring[index].buffer1 = mapping + NET_IP_ALIGN;
+	pd->rx_ring[index].status = RDES0_OWN_;
+	wmb();
+
+	return 0;
+}
+
+static void smsc9420_alloc_new_rx_buffers(struct smsc9420_pdata *pd)
+{
+	while (pd->rx_ring_tail != pd->rx_ring_head) {
+		if (smsc9420_alloc_rx_buffer(pd, pd->rx_ring_tail))
+			break;
+
+		pd->rx_ring_tail = (pd->rx_ring_tail + 1) % RX_RING_SIZE;
+	}
+}
+
+static int smsc9420_rx_poll(struct napi_struct *napi, int budget)
+{
+	struct smsc9420_pdata *pd =
+		container_of(napi, struct smsc9420_pdata, napi);
+	struct net_device *dev = pd->dev;
+	u32 drop_frame_cnt, dma_intr_ena, status;
+	int work_done;
+
+	for (work_done = 0; work_done < budget; work_done++) {
+		rmb();
+		status = pd->rx_ring[pd->rx_ring_head].status;
+
+		/* stop if DMAC owns this dma descriptor */
+		if (status & RDES0_OWN_)
+			break;
+
+		smsc9420_rx_count_stats(dev, status);
+		smsc9420_rx_handoff(pd, pd->rx_ring_head, status);
+		pd->rx_ring_head = (pd->rx_ring_head + 1) % RX_RING_SIZE;
+		smsc9420_alloc_new_rx_buffers(pd);
+	}
+
+	drop_frame_cnt = smsc9420_reg_read(pd, MISS_FRAME_CNTR);
+	dev->stats.rx_dropped +=
+	    (drop_frame_cnt & 0xFFFF) + ((drop_frame_cnt >> 17) & 0x3FF);
+
+	/* Kick RXDMA */
+	smsc9420_reg_write(pd, RX_POLL_DEMAND, 1);
+	smsc9420_pci_flush_write(pd);
+
+	if (work_done < budget) {
+		napi_complete(&pd->napi);
+
+		/* re-enable RX DMA interrupts */
+		dma_intr_ena = smsc9420_reg_read(pd, DMAC_INTR_ENA);
+		dma_intr_ena |= (DMAC_INTR_ENA_RX_ | DMAC_INTR_ENA_NIS_);
+		smsc9420_reg_write(pd, DMAC_INTR_ENA, dma_intr_ena);
+		smsc9420_pci_flush_write(pd);
+	}
+	return work_done;
+}
+
+static void
+smsc9420_tx_update_stats(struct net_device *dev, u32 status, u32 length)
+{
+	if (unlikely(status & TDES0_ERROR_SUMMARY_)) {
+		dev->stats.tx_errors++;
+		if (status & (TDES0_EXCESSIVE_DEFERRAL_ |
+			TDES0_EXCESSIVE_COLLISIONS_))
+			dev->stats.tx_aborted_errors++;
+
+		if (status & (TDES0_LOSS_OF_CARRIER_ | TDES0_NO_CARRIER_))
+			dev->stats.tx_carrier_errors++;
+	} else {
+		dev->stats.tx_packets++;
+		dev->stats.tx_bytes += (length & 0x7FF);
+	}
+
+	if (unlikely(status & TDES0_EXCESSIVE_COLLISIONS_)) {
+		dev->stats.collisions += 16;
+	} else {
+		dev->stats.collisions +=
+			(status & TDES0_COLLISION_COUNT_MASK_) >>
+			TDES0_COLLISION_COUNT_SHFT_;
+	}
+
+	if (unlikely(status & TDES0_HEARTBEAT_FAIL_))
+		dev->stats.tx_heartbeat_errors++;
+}
+
+/* Check for completed dma transfers, update stats and free skbs */
+static void smsc9420_complete_tx(struct net_device *dev)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+
+	while (pd->tx_ring_tail != pd->tx_ring_head) {
+		int index = pd->tx_ring_tail;
+		u32 status, length;
+
+		rmb();
+		status = pd->tx_ring[index].status;
+		length = pd->tx_ring[index].length;
+
+		/* Check if DMA still owns this descriptor */
+		if (unlikely(TDES0_OWN_ & status))
+			break;
+
+		smsc9420_tx_update_stats(dev, status, length);
+
+		BUG_ON(!pd->tx_buffers[index].skb);
+		BUG_ON(!pd->tx_buffers[index].mapping);
+
+		pci_unmap_single(pd->pdev, pd->tx_buffers[index].mapping,
+			pd->tx_buffers[index].skb->len, PCI_DMA_TODEVICE);
+		pd->tx_buffers[index].mapping = 0;
+
+		dev_kfree_skb_any(pd->tx_buffers[index].skb);
+		pd->tx_buffers[index].skb = NULL;
+
+		pd->tx_ring[index].buffer1 = 0;
+		wmb();
+
+		pd->tx_ring_tail = (pd->tx_ring_tail + 1) % TX_RING_SIZE;
+	}
+}
+
+static netdev_tx_t smsc9420_hard_start_xmit(struct sk_buff *skb,
+					    struct net_device *dev)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+	dma_addr_t mapping;
+	int index = pd->tx_ring_head;
+	u32 tmp_desc1;
+	bool about_to_take_last_desc =
+		(((pd->tx_ring_head + 2) % TX_RING_SIZE) == pd->tx_ring_tail);
+
+	smsc9420_complete_tx(dev);
+
+	rmb();
+	BUG_ON(pd->tx_ring[index].status & TDES0_OWN_);
+	BUG_ON(pd->tx_buffers[index].skb);
+	BUG_ON(pd->tx_buffers[index].mapping);
+
+	mapping = pci_map_single(pd->pdev, skb->data,
+				 skb->len, PCI_DMA_TODEVICE);
+	if (pci_dma_mapping_error(pd->pdev, mapping)) {
+		netif_warn(pd, tx_err, pd->dev,
+			   "pci_map_single failed, dropping packet\n");
+		return NETDEV_TX_BUSY;
+	}
+
+	pd->tx_buffers[index].skb = skb;
+	pd->tx_buffers[index].mapping = mapping;
+
+	tmp_desc1 = (TDES1_LS_ | ((u32)skb->len & 0x7FF));
+	if (unlikely(about_to_take_last_desc)) {
+		tmp_desc1 |= TDES1_IC_;
+		netif_stop_queue(pd->dev);
+	}
+
+	/* check if we are at the last descriptor and need to set EOR */
+	if (unlikely(index == (TX_RING_SIZE - 1)))
+		tmp_desc1 |= TDES1_TER_;
+
+	pd->tx_ring[index].buffer1 = mapping;
+	pd->tx_ring[index].length = tmp_desc1;
+	wmb();
+
+	/* increment head */
+	pd->tx_ring_head = (pd->tx_ring_head + 1) % TX_RING_SIZE;
+
+	/* assign ownership to DMAC */
+	pd->tx_ring[index].status = TDES0_OWN_;
+	wmb();
+
+	skb_tx_timestamp(skb);
+
+	/* kick the DMA */
+	smsc9420_reg_write(pd, TX_POLL_DEMAND, 1);
+	smsc9420_pci_flush_write(pd);
+
+	return NETDEV_TX_OK;
+}
+
+static struct net_device_stats *smsc9420_get_stats(struct net_device *dev)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+	u32 counter = smsc9420_reg_read(pd, MISS_FRAME_CNTR);
+	dev->stats.rx_dropped +=
+	    (counter & 0x0000FFFF) + ((counter >> 17) & 0x000003FF);
+	return &dev->stats;
+}
+
+static void smsc9420_set_multicast_list(struct net_device *dev)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+	u32 mac_cr = smsc9420_reg_read(pd, MAC_CR);
+
+	if (dev->flags & IFF_PROMISC) {
+		netif_dbg(pd, hw, pd->dev, "Promiscuous Mode Enabled\n");
+		mac_cr |= MAC_CR_PRMS_;
+		mac_cr &= (~MAC_CR_MCPAS_);
+		mac_cr &= (~MAC_CR_HPFILT_);
+	} else if (dev->flags & IFF_ALLMULTI) {
+		netif_dbg(pd, hw, pd->dev, "Receive all Multicast Enabled\n");
+		mac_cr &= (~MAC_CR_PRMS_);
+		mac_cr |= MAC_CR_MCPAS_;
+		mac_cr &= (~MAC_CR_HPFILT_);
+	} else if (!netdev_mc_empty(dev)) {
+		struct netdev_hw_addr *ha;
+		u32 hash_lo = 0, hash_hi = 0;
+
+		netif_dbg(pd, hw, pd->dev, "Multicast filter enabled\n");
+		netdev_for_each_mc_addr(ha, dev) {
+			u32 bit_num = smsc9420_hash(ha->addr);
+			u32 mask = 1 << (bit_num & 0x1F);
+
+			if (bit_num & 0x20)
+				hash_hi |= mask;
+			else
+				hash_lo |= mask;
+
+		}
+		smsc9420_reg_write(pd, HASHH, hash_hi);
+		smsc9420_reg_write(pd, HASHL, hash_lo);
+
+		mac_cr &= (~MAC_CR_PRMS_);
+		mac_cr &= (~MAC_CR_MCPAS_);
+		mac_cr |= MAC_CR_HPFILT_;
+	} else {
+		netif_dbg(pd, hw, pd->dev, "Receive own packets only\n");
+		smsc9420_reg_write(pd, HASHH, 0);
+		smsc9420_reg_write(pd, HASHL, 0);
+
+		mac_cr &= (~MAC_CR_PRMS_);
+		mac_cr &= (~MAC_CR_MCPAS_);
+		mac_cr &= (~MAC_CR_HPFILT_);
+	}
+
+	smsc9420_reg_write(pd, MAC_CR, mac_cr);
+	smsc9420_pci_flush_write(pd);
+}
+
+static void smsc9420_phy_update_flowcontrol(struct smsc9420_pdata *pd)
+{
+	struct phy_device *phy_dev = pd->phy_dev;
+	u32 flow;
+
+	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;
+
+		netif_info(pd, link, pd->dev, "rx pause %s, tx pause %s\n",
+			   cap & FLOW_CTRL_RX ? "enabled" : "disabled",
+			   cap & FLOW_CTRL_TX ? "enabled" : "disabled");
+	} else {
+		netif_info(pd, link, pd->dev, "half duplex\n");
+		flow = 0;
+	}
+
+	smsc9420_reg_write(pd, FLOW, flow);
+}
+
+/* Update link mode if anything has changed.  Called periodically when the
+ * PHY is in polling mode, even if nothing has changed. */
+static void smsc9420_phy_adjust_link(struct net_device *dev)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+	struct phy_device *phy_dev = pd->phy_dev;
+	int carrier;
+
+	if (phy_dev->duplex != pd->last_duplex) {
+		u32 mac_cr = smsc9420_reg_read(pd, MAC_CR);
+		if (phy_dev->duplex) {
+			netif_dbg(pd, link, pd->dev, "full duplex mode\n");
+			mac_cr |= MAC_CR_FDPX_;
+		} else {
+			netif_dbg(pd, link, pd->dev, "half duplex mode\n");
+			mac_cr &= ~MAC_CR_FDPX_;
+		}
+		smsc9420_reg_write(pd, MAC_CR, mac_cr);
+
+		smsc9420_phy_update_flowcontrol(pd);
+		pd->last_duplex = phy_dev->duplex;
+	}
+
+	carrier = netif_carrier_ok(dev);
+	if (carrier != pd->last_carrier) {
+		if (carrier)
+			netif_dbg(pd, link, pd->dev, "carrier OK\n");
+		else
+			netif_dbg(pd, link, pd->dev, "no carrier\n");
+		pd->last_carrier = carrier;
+	}
+}
+
+static int smsc9420_mii_probe(struct net_device *dev)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+	struct phy_device *phydev = NULL;
+
+	BUG_ON(pd->phy_dev);
+
+	/* Device only supports internal PHY at address 1 */
+	if (!pd->mii_bus->phy_map[1]) {
+		netdev_err(dev, "no PHY found at address 1\n");
+		return -ENODEV;
+	}
+
+	phydev = pd->mii_bus->phy_map[1];
+	netif_info(pd, probe, pd->dev, "PHY addr %d, phy_id 0x%08X\n",
+		   phydev->addr, phydev->phy_id);
+
+	phydev = phy_connect(dev, dev_name(&phydev->dev),
+			     smsc9420_phy_adjust_link, PHY_INTERFACE_MODE_MII);
+
+	if (IS_ERR(phydev)) {
+		netdev_err(dev, "Could not attach to PHY\n");
+		return PTR_ERR(phydev);
+	}
+
+	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;
+
+	pd->phy_dev = phydev;
+	pd->last_duplex = -1;
+	pd->last_carrier = -1;
+
+	return 0;
+}
+
+static int smsc9420_mii_init(struct net_device *dev)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+	int err = -ENXIO, i;
+
+	pd->mii_bus = mdiobus_alloc();
+	if (!pd->mii_bus) {
+		err = -ENOMEM;
+		goto err_out_1;
+	}
+	pd->mii_bus->name = DRV_MDIONAME;
+	snprintf(pd->mii_bus->id, MII_BUS_ID_SIZE, "%x",
+		(pd->pdev->bus->number << 8) | pd->pdev->devfn);
+	pd->mii_bus->priv = pd;
+	pd->mii_bus->read = smsc9420_mii_read;
+	pd->mii_bus->write = smsc9420_mii_write;
+	pd->mii_bus->irq = pd->phy_irq;
+	for (i = 0; i < PHY_MAX_ADDR; ++i)
+		pd->mii_bus->irq[i] = PHY_POLL;
+
+	/* Mask all PHYs except ID 1 (internal) */
+	pd->mii_bus->phy_mask = ~(1 << 1);
+
+	if (mdiobus_register(pd->mii_bus)) {
+		netif_warn(pd, probe, pd->dev, "Error registering mii bus\n");
+		goto err_out_free_bus_2;
+	}
+
+	if (smsc9420_mii_probe(dev) < 0) {
+		netif_warn(pd, probe, pd->dev, "Error probing mii bus\n");
+		goto err_out_unregister_bus_3;
+	}
+
+	return 0;
+
+err_out_unregister_bus_3:
+	mdiobus_unregister(pd->mii_bus);
+err_out_free_bus_2:
+	mdiobus_free(pd->mii_bus);
+err_out_1:
+	return err;
+}
+
+static int smsc9420_alloc_tx_ring(struct smsc9420_pdata *pd)
+{
+	int i;
+
+	BUG_ON(!pd->tx_ring);
+
+	pd->tx_buffers = kmalloc_array(TX_RING_SIZE,
+				       sizeof(struct smsc9420_ring_info),
+				       GFP_KERNEL);
+	if (!pd->tx_buffers)
+		return -ENOMEM;
+
+	/* Initialize the TX Ring */
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		pd->tx_buffers[i].skb = NULL;
+		pd->tx_buffers[i].mapping = 0;
+		pd->tx_ring[i].status = 0;
+		pd->tx_ring[i].length = 0;
+		pd->tx_ring[i].buffer1 = 0;
+		pd->tx_ring[i].buffer2 = 0;
+	}
+	pd->tx_ring[TX_RING_SIZE - 1].length = TDES1_TER_;
+	wmb();
+
+	pd->tx_ring_head = 0;
+	pd->tx_ring_tail = 0;
+
+	smsc9420_reg_write(pd, TX_BASE_ADDR, pd->tx_dma_addr);
+	smsc9420_pci_flush_write(pd);
+
+	return 0;
+}
+
+static int smsc9420_alloc_rx_ring(struct smsc9420_pdata *pd)
+{
+	int i;
+
+	BUG_ON(!pd->rx_ring);
+
+	pd->rx_buffers = kmalloc_array(RX_RING_SIZE,
+				       sizeof(struct smsc9420_ring_info),
+				       GFP_KERNEL);
+	if (pd->rx_buffers == NULL)
+		goto out;
+
+	/* initialize the rx ring */
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		pd->rx_ring[i].status = 0;
+		pd->rx_ring[i].length = PKT_BUF_SZ;
+		pd->rx_ring[i].buffer2 = 0;
+		pd->rx_buffers[i].skb = NULL;
+		pd->rx_buffers[i].mapping = 0;
+	}
+	pd->rx_ring[RX_RING_SIZE - 1].length = (PKT_BUF_SZ | RDES1_RER_);
+
+	/* now allocate the entire ring of skbs */
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		if (smsc9420_alloc_rx_buffer(pd, i)) {
+			netif_warn(pd, ifup, pd->dev,
+				   "failed to allocate rx skb %d\n", i);
+			goto out_free_rx_skbs;
+		}
+	}
+
+	pd->rx_ring_head = 0;
+	pd->rx_ring_tail = 0;
+
+	smsc9420_reg_write(pd, VLAN1, ETH_P_8021Q);
+	netif_dbg(pd, ifup, pd->dev, "VLAN1 = 0x%08x\n",
+		  smsc9420_reg_read(pd, VLAN1));
+
+	if (pd->rx_csum) {
+		/* Enable RX COE */
+		u32 coe = smsc9420_reg_read(pd, COE_CR) | RX_COE_EN;
+		smsc9420_reg_write(pd, COE_CR, coe);
+		netif_dbg(pd, ifup, pd->dev, "COE_CR = 0x%08x\n", coe);
+	}
+
+	smsc9420_reg_write(pd, RX_BASE_ADDR, pd->rx_dma_addr);
+	smsc9420_pci_flush_write(pd);
+
+	return 0;
+
+out_free_rx_skbs:
+	smsc9420_free_rx_ring(pd);
+out:
+	return -ENOMEM;
+}
+
+static int smsc9420_open(struct net_device *dev)
+{
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+	u32 bus_mode, mac_cr, dmac_control, int_cfg, dma_intr_ena, int_ctl;
+	const int irq = pd->pdev->irq;
+	unsigned long flags;
+	int result = 0, timeout;
+
+	if (!is_valid_ether_addr(dev->dev_addr)) {
+		netif_warn(pd, ifup, pd->dev,
+			   "dev_addr is not a valid MAC address\n");
+		result = -EADDRNOTAVAIL;
+		goto out_0;
+	}
+
+	netif_carrier_off(dev);
+
+	/* disable, mask and acknowledge all interrupts */
+	spin_lock_irqsave(&pd->int_lock, flags);
+	int_cfg = smsc9420_reg_read(pd, INT_CFG) & (~INT_CFG_IRQ_EN_);
+	smsc9420_reg_write(pd, INT_CFG, int_cfg);
+	smsc9420_reg_write(pd, INT_CTL, 0);
+	spin_unlock_irqrestore(&pd->int_lock, flags);
+	smsc9420_reg_write(pd, DMAC_INTR_ENA, 0);
+	smsc9420_reg_write(pd, INT_STAT, 0xFFFFFFFF);
+	smsc9420_pci_flush_write(pd);
+
+	result = request_irq(irq, smsc9420_isr, IRQF_SHARED, DRV_NAME, pd);
+	if (result) {
+		netif_warn(pd, ifup, pd->dev, "Unable to use IRQ = %d\n", irq);
+		result = -ENODEV;
+		goto out_0;
+	}
+
+	smsc9420_dmac_soft_reset(pd);
+
+	/* make sure MAC_CR is sane */
+	smsc9420_reg_write(pd, MAC_CR, 0);
+
+	smsc9420_set_mac_address(dev);
+
+	/* Configure GPIO pins to drive LEDs */
+	smsc9420_reg_write(pd, GPIO_CFG,
+		(GPIO_CFG_LED_3_ | GPIO_CFG_LED_2_ | GPIO_CFG_LED_1_));
+
+	bus_mode = BUS_MODE_DMA_BURST_LENGTH_16;
+
+#ifdef __BIG_ENDIAN
+	bus_mode |= BUS_MODE_DBO_;
+#endif
+
+	smsc9420_reg_write(pd, BUS_MODE, bus_mode);
+
+	smsc9420_pci_flush_write(pd);
+
+	/* set bus master bridge arbitration priority for Rx and TX DMA */
+	smsc9420_reg_write(pd, BUS_CFG, BUS_CFG_RXTXWEIGHT_4_1);
+
+	smsc9420_reg_write(pd, DMAC_CONTROL,
+		(DMAC_CONTROL_SF_ | DMAC_CONTROL_OSF_));
+
+	smsc9420_pci_flush_write(pd);
+
+	/* test the IRQ connection to the ISR */
+	netif_dbg(pd, ifup, pd->dev, "Testing ISR using IRQ %d\n", irq);
+	pd->software_irq_signal = false;
+
+	spin_lock_irqsave(&pd->int_lock, flags);
+	/* configure interrupt deassertion timer and enable interrupts */
+	int_cfg = smsc9420_reg_read(pd, INT_CFG) | INT_CFG_IRQ_EN_;
+	int_cfg &= ~(INT_CFG_INT_DEAS_MASK);
+	int_cfg |= (INT_DEAS_TIME & INT_CFG_INT_DEAS_MASK);
+	smsc9420_reg_write(pd, INT_CFG, int_cfg);
+
+	/* unmask software interrupt */
+	int_ctl = smsc9420_reg_read(pd, INT_CTL) | INT_CTL_SW_INT_EN_;
+	smsc9420_reg_write(pd, INT_CTL, int_ctl);
+	spin_unlock_irqrestore(&pd->int_lock, flags);
+	smsc9420_pci_flush_write(pd);
+
+	timeout = 1000;
+	while (timeout--) {
+		if (pd->software_irq_signal)
+			break;
+		msleep(1);
+	}
+
+	/* disable interrupts */
+	spin_lock_irqsave(&pd->int_lock, flags);
+	int_cfg = smsc9420_reg_read(pd, INT_CFG) & (~INT_CFG_IRQ_EN_);
+	smsc9420_reg_write(pd, INT_CFG, int_cfg);
+	spin_unlock_irqrestore(&pd->int_lock, flags);
+
+	if (!pd->software_irq_signal) {
+		netif_warn(pd, ifup, pd->dev, "ISR failed signaling test\n");
+		result = -ENODEV;
+		goto out_free_irq_1;
+	}
+
+	netif_dbg(pd, ifup, pd->dev, "ISR passed test using IRQ %d\n", irq);
+
+	result = smsc9420_alloc_tx_ring(pd);
+	if (result) {
+		netif_warn(pd, ifup, pd->dev,
+			   "Failed to Initialize tx dma ring\n");
+		result = -ENOMEM;
+		goto out_free_irq_1;
+	}
+
+	result = smsc9420_alloc_rx_ring(pd);
+	if (result) {
+		netif_warn(pd, ifup, pd->dev,
+			   "Failed to Initialize rx dma ring\n");
+		result = -ENOMEM;
+		goto out_free_tx_ring_2;
+	}
+
+	result = smsc9420_mii_init(dev);
+	if (result) {
+		netif_warn(pd, ifup, pd->dev, "Failed to initialize Phy\n");
+		result = -ENODEV;
+		goto out_free_rx_ring_3;
+	}
+
+	/* Bring the PHY up */
+	phy_start(pd->phy_dev);
+
+	napi_enable(&pd->napi);
+
+	/* start tx and rx */
+	mac_cr = smsc9420_reg_read(pd, MAC_CR) | MAC_CR_TXEN_ | MAC_CR_RXEN_;
+	smsc9420_reg_write(pd, MAC_CR, mac_cr);
+
+	dmac_control = smsc9420_reg_read(pd, DMAC_CONTROL);
+	dmac_control |= DMAC_CONTROL_ST_ | DMAC_CONTROL_SR_;
+	smsc9420_reg_write(pd, DMAC_CONTROL, dmac_control);
+	smsc9420_pci_flush_write(pd);
+
+	dma_intr_ena = smsc9420_reg_read(pd, DMAC_INTR_ENA);
+	dma_intr_ena |=
+		(DMAC_INTR_ENA_TX_ | DMAC_INTR_ENA_RX_ | DMAC_INTR_ENA_NIS_);
+	smsc9420_reg_write(pd, DMAC_INTR_ENA, dma_intr_ena);
+	smsc9420_pci_flush_write(pd);
+
+	netif_wake_queue(dev);
+
+	smsc9420_reg_write(pd, RX_POLL_DEMAND, 1);
+
+	/* enable interrupts */
+	spin_lock_irqsave(&pd->int_lock, flags);
+	int_cfg = smsc9420_reg_read(pd, INT_CFG) | INT_CFG_IRQ_EN_;
+	smsc9420_reg_write(pd, INT_CFG, int_cfg);
+	spin_unlock_irqrestore(&pd->int_lock, flags);
+
+	return 0;
+
+out_free_rx_ring_3:
+	smsc9420_free_rx_ring(pd);
+out_free_tx_ring_2:
+	smsc9420_free_tx_ring(pd);
+out_free_irq_1:
+	free_irq(irq, pd);
+out_0:
+	return result;
+}
+
+#ifdef CONFIG_PM
+
+static int smsc9420_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+	u32 int_cfg;
+	ulong flags;
+
+	/* disable interrupts */
+	spin_lock_irqsave(&pd->int_lock, flags);
+	int_cfg = smsc9420_reg_read(pd, INT_CFG) & (~INT_CFG_IRQ_EN_);
+	smsc9420_reg_write(pd, INT_CFG, int_cfg);
+	spin_unlock_irqrestore(&pd->int_lock, flags);
+
+	if (netif_running(dev)) {
+		netif_tx_disable(dev);
+		smsc9420_stop_tx(pd);
+		smsc9420_free_tx_ring(pd);
+
+		napi_disable(&pd->napi);
+		smsc9420_stop_rx(pd);
+		smsc9420_free_rx_ring(pd);
+
+		free_irq(pd->pdev->irq, pd);
+
+		netif_device_detach(dev);
+	}
+
+	pci_save_state(pdev);
+	pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);
+	pci_disable_device(pdev);
+	pci_set_power_state(pdev, pci_choose_state(pdev, state));
+
+	return 0;
+}
+
+static int smsc9420_resume(struct pci_dev *pdev)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	struct smsc9420_pdata *pd = netdev_priv(dev);
+	int err;
+
+	pci_set_power_state(pdev, PCI_D0);
+	pci_restore_state(pdev);
+
+	err = pci_enable_device(pdev);
+	if (err)
+		return err;
+
+	pci_set_master(pdev);
+
+	err = pci_enable_wake(pdev, PCI_D0, 0);
+	if (err)
+		netif_warn(pd, ifup, pd->dev, "pci_enable_wake failed: %d\n",
+			   err);
+
+	if (netif_running(dev)) {
+		/* FIXME: gross. It looks like ancient PM relic.*/
+		err = smsc9420_open(dev);
+		netif_device_attach(dev);
+	}
+	return err;
+}
+
+#endif /* CONFIG_PM */
+
+static const struct net_device_ops smsc9420_netdev_ops = {
+	.ndo_open		= smsc9420_open,
+	.ndo_stop		= smsc9420_stop,
+	.ndo_start_xmit		= smsc9420_hard_start_xmit,
+	.ndo_get_stats		= smsc9420_get_stats,
+	.ndo_set_rx_mode	= smsc9420_set_multicast_list,
+	.ndo_do_ioctl		= smsc9420_do_ioctl,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address 	= eth_mac_addr,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= smsc9420_poll_controller,
+#endif /* CONFIG_NET_POLL_CONTROLLER */
+};
+
+static int
+smsc9420_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct net_device *dev;
+	struct smsc9420_pdata *pd;
+	void __iomem *virt_addr;
+	int result = 0;
+	u32 id_rev;
+
+	pr_info("%s version %s\n", DRV_DESCRIPTION, DRV_VERSION);
+
+	/* First do the PCI initialisation */
+	result = pci_enable_device(pdev);
+	if (unlikely(result)) {
+		pr_err("Cannot enable smsc9420\n");
+		goto out_0;
+	}
+
+	pci_set_master(pdev);
+
+	dev = alloc_etherdev(sizeof(*pd));
+	if (!dev)
+		goto out_disable_pci_device_1;
+
+	SET_NETDEV_DEV(dev, &pdev->dev);
+
+	if (!(pci_resource_flags(pdev, SMSC_BAR) & IORESOURCE_MEM)) {
+		netdev_err(dev, "Cannot find PCI device base address\n");
+		goto out_free_netdev_2;
+	}
+
+	if ((pci_request_regions(pdev, DRV_NAME))) {
+		netdev_err(dev, "Cannot obtain PCI resources, aborting\n");
+		goto out_free_netdev_2;
+	}
+
+	if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
+		netdev_err(dev, "No usable DMA configuration, aborting\n");
+		goto out_free_regions_3;
+	}
+
+	virt_addr = ioremap(pci_resource_start(pdev, SMSC_BAR),
+		pci_resource_len(pdev, SMSC_BAR));
+	if (!virt_addr) {
+		netdev_err(dev, "Cannot map device registers, aborting\n");
+		goto out_free_regions_3;
+	}
+
+	/* registers are double mapped with 0 offset for LE and 0x200 for BE */
+	virt_addr += LAN9420_CPSR_ENDIAN_OFFSET;
+
+	pd = netdev_priv(dev);
+
+	/* pci descriptors are created in the PCI consistent area */
+	pd->rx_ring = pci_alloc_consistent(pdev,
+		sizeof(struct smsc9420_dma_desc) * RX_RING_SIZE +
+		sizeof(struct smsc9420_dma_desc) * TX_RING_SIZE,
+		&pd->rx_dma_addr);
+
+	if (!pd->rx_ring)
+		goto out_free_io_4;
+
+	/* descriptors are aligned due to the nature of pci_alloc_consistent */
+	pd->tx_ring = (pd->rx_ring + RX_RING_SIZE);
+	pd->tx_dma_addr = pd->rx_dma_addr +
+	    sizeof(struct smsc9420_dma_desc) * RX_RING_SIZE;
+
+	pd->pdev = pdev;
+	pd->dev = dev;
+	pd->ioaddr = virt_addr;
+	pd->msg_enable = smsc_debug;
+	pd->rx_csum = true;
+
+	netif_dbg(pd, probe, pd->dev, "lan_base=0x%08lx\n", (ulong)virt_addr);
+
+	id_rev = smsc9420_reg_read(pd, ID_REV);
+	switch (id_rev & 0xFFFF0000) {
+	case 0x94200000:
+		netif_info(pd, probe, pd->dev,
+			   "LAN9420 identified, ID_REV=0x%08X\n", id_rev);
+		break;
+	default:
+		netif_warn(pd, probe, pd->dev, "LAN9420 NOT identified\n");
+		netif_warn(pd, probe, pd->dev, "ID_REV=0x%08X\n", id_rev);
+		goto out_free_dmadesc_5;
+	}
+
+	smsc9420_dmac_soft_reset(pd);
+	smsc9420_eeprom_reload(pd);
+	smsc9420_check_mac_address(dev);
+
+	dev->netdev_ops = &smsc9420_netdev_ops;
+	dev->ethtool_ops = &smsc9420_ethtool_ops;
+
+	netif_napi_add(dev, &pd->napi, smsc9420_rx_poll, NAPI_WEIGHT);
+
+	result = register_netdev(dev);
+	if (result) {
+		netif_warn(pd, probe, pd->dev, "error %i registering device\n",
+			   result);
+		goto out_free_dmadesc_5;
+	}
+
+	pci_set_drvdata(pdev, dev);
+
+	spin_lock_init(&pd->int_lock);
+	spin_lock_init(&pd->phy_lock);
+
+	dev_info(&dev->dev, "MAC Address: %pM\n", dev->dev_addr);
+
+	return 0;
+
+out_free_dmadesc_5:
+	pci_free_consistent(pdev, sizeof(struct smsc9420_dma_desc) *
+		(RX_RING_SIZE + TX_RING_SIZE), pd->rx_ring, pd->rx_dma_addr);
+out_free_io_4:
+	iounmap(virt_addr - LAN9420_CPSR_ENDIAN_OFFSET);
+out_free_regions_3:
+	pci_release_regions(pdev);
+out_free_netdev_2:
+	free_netdev(dev);
+out_disable_pci_device_1:
+	pci_disable_device(pdev);
+out_0:
+	return -ENODEV;
+}
+
+static void smsc9420_remove(struct pci_dev *pdev)
+{
+	struct net_device *dev;
+	struct smsc9420_pdata *pd;
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		return;
+
+	pd = netdev_priv(dev);
+	unregister_netdev(dev);
+
+	/* tx_buffers and rx_buffers are freed in stop */
+	BUG_ON(pd->tx_buffers);
+	BUG_ON(pd->rx_buffers);
+
+	BUG_ON(!pd->tx_ring);
+	BUG_ON(!pd->rx_ring);
+
+	pci_free_consistent(pdev, sizeof(struct smsc9420_dma_desc) *
+		(RX_RING_SIZE + TX_RING_SIZE), pd->rx_ring, pd->rx_dma_addr);
+
+	iounmap(pd->ioaddr - LAN9420_CPSR_ENDIAN_OFFSET);
+	pci_release_regions(pdev);
+	free_netdev(dev);
+	pci_disable_device(pdev);
+}
+
+static struct pci_driver smsc9420_driver = {
+	.name = DRV_NAME,
+	.id_table = smsc9420_id_table,
+	.probe = smsc9420_probe,
+	.remove = smsc9420_remove,
+#ifdef CONFIG_PM
+	.suspend = smsc9420_suspend,
+	.resume = smsc9420_resume,
+#endif /* CONFIG_PM */
+};
+
+static int __init smsc9420_init_module(void)
+{
+	smsc_debug = netif_msg_init(debug, SMSC_MSG_DEFAULT);
+
+	return pci_register_driver(&smsc9420_driver);
+}
+
+static void __exit smsc9420_exit_module(void)
+{
+	pci_unregister_driver(&smsc9420_driver);
+}
+
+module_init(smsc9420_init_module);
+module_exit(smsc9420_exit_module);