Ethernet driver for the WIZnet W5100 chip

Based on original driver from chip manufacturer, but nearly full rewite.
Tested and used in production with Blackfin BF531 embedded processor.

Signed-off-by: Mike Sinkovsky <msink@permonline.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 808 insertions, 0 deletions

diff --git a/drivers/net/ethernet/wiznet/w5100.c b/drivers/net/ethernet/wiznet/w5100.c
new file mode 100644
index 000000000000..c28e1d57b02d
--- /dev/null
+++ b/drivers/net/ethernet/wiznet/w5100.c
@@ -0,0 +1,808 @@
+/*
+ * Ethernet driver for the WIZnet W5100 chip.
+ *
+ * Copyright (C) 2006-2008 WIZnet Co.,Ltd.
+ * Copyright (C) 2012 Mike Sinkovsky <msink@permonline.ru>
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/kconfig.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/wiznet.h>
+#include <linux/ethtool.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+
+#define DRV_NAME	"w5100"
+#define DRV_VERSION	"2012-04-04"
+
+MODULE_DESCRIPTION("WIZnet W5100 Ethernet driver v"DRV_VERSION);
+MODULE_AUTHOR("Mike Sinkovsky <msink@permonline.ru>");
+MODULE_ALIAS("platform:"DRV_NAME);
+MODULE_LICENSE("GPL");
+
+/*
+ * Registers
+ */
+#define W5100_COMMON_REGS	0x0000
+#define W5100_MR		0x0000 /* Mode Register */
+#define   MR_RST		  0x80 /* S/W reset */
+#define   MR_PB			  0x10 /* Ping block */
+#define   MR_AI			  0x02 /* Address Auto-Increment */
+#define   MR_IND		  0x01 /* Indirect mode */
+#define W5100_SHAR		0x0009 /* Source MAC address */
+#define W5100_IR		0x0015 /* Interrupt Register */
+#define W5100_IMR		0x0016 /* Interrupt Mask Register */
+#define   IR_S0			  0x01 /* S0 interrupt */
+#define W5100_RTR		0x0017 /* Retry Time-value Register */
+#define   RTR_DEFAULT		  2000 /* =0x07d0 (2000) */
+#define W5100_RMSR		0x001a /* Receive Memory Size */
+#define W5100_TMSR		0x001b /* Transmit Memory Size */
+#define W5100_COMMON_REGS_LEN	0x0040
+
+#define W5100_S0_REGS		0x0400
+#define W5100_S0_MR		0x0400 /* S0 Mode Register */
+#define   S0_MR_MACRAW		  0x04 /* MAC RAW mode (promiscous) */
+#define   S0_MR_MACRAW_MF	  0x44 /* MAC RAW mode (filtered) */
+#define W5100_S0_CR		0x0401 /* S0 Command Register */
+#define   S0_CR_OPEN		  0x01 /* OPEN command */
+#define   S0_CR_CLOSE		  0x10 /* CLOSE command */
+#define   S0_CR_SEND		  0x20 /* SEND command */
+#define   S0_CR_RECV		  0x40 /* RECV command */
+#define W5100_S0_IR		0x0402 /* S0 Interrupt Register */
+#define   S0_IR_SENDOK		  0x10 /* complete sending */
+#define   S0_IR_RECV		  0x04 /* receiving data */
+#define W5100_S0_SR		0x0403 /* S0 Status Register */
+#define   S0_SR_MACRAW		  0x42 /* mac raw mode */
+#define W5100_S0_TX_FSR		0x0420 /* S0 Transmit free memory size */
+#define W5100_S0_TX_RD		0x0422 /* S0 Transmit memory read pointer */
+#define W5100_S0_TX_WR		0x0424 /* S0 Transmit memory write pointer */
+#define W5100_S0_RX_RSR		0x0426 /* S0 Receive free memory size */
+#define W5100_S0_RX_RD		0x0428 /* S0 Receive memory read pointer */
+#define W5100_S0_REGS_LEN	0x0040
+
+#define W5100_TX_MEM_START	0x4000
+#define W5100_TX_MEM_END	0x5fff
+#define W5100_TX_MEM_MASK	0x1fff
+#define W5100_RX_MEM_START	0x6000
+#define W5100_RX_MEM_END	0x7fff
+#define W5100_RX_MEM_MASK	0x1fff
+
+/*
+ * Device driver private data structure
+ */
+struct w5100_priv {
+	void __iomem *base;
+	spinlock_t reg_lock;
+	bool indirect;
+	u8   (*read)(struct w5100_priv *priv, u16 addr);
+	void (*write)(struct w5100_priv *priv, u16 addr, u8 data);
+	u16  (*read16)(struct w5100_priv *priv, u16 addr);
+	void (*write16)(struct w5100_priv *priv, u16 addr, u16 data);
+	void (*readbuf)(struct w5100_priv *priv, u16 addr, u8 *buf, int len);
+	void (*writebuf)(struct w5100_priv *priv, u16 addr, u8 *buf, int len);
+	int irq;
+	int link_irq;
+	int link_gpio;
+
+	struct napi_struct napi;
+	struct net_device *ndev;
+	bool promisc;
+	u32 msg_enable;
+};
+
+/************************************************************************
+ *
+ *  Lowlevel I/O functions
+ *
+ ***********************************************************************/
+
+/*
+ * In direct address mode host system can directly access W5100 registers
+ * after mapping to Memory-Mapped I/O space.
+ *
+ * 0x8000 bytes are required for memory space.
+ */
+static inline u8 w5100_read_direct(struct w5100_priv *priv, u16 addr)
+{
+	return ioread8(priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
+}
+
+static inline void w5100_write_direct(struct w5100_priv *priv,
+				      u16 addr, u8 data)
+{
+	iowrite8(data, priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
+}
+
+static u16 w5100_read16_direct(struct w5100_priv *priv, u16 addr)
+{
+	u16 data;
+	data  = w5100_read_direct(priv, addr) << 8;
+	data |= w5100_read_direct(priv, addr + 1);
+	return data;
+}
+
+static void w5100_write16_direct(struct w5100_priv *priv, u16 addr, u16 data)
+{
+	w5100_write_direct(priv, addr, data >> 8);
+	w5100_write_direct(priv, addr + 1, data);
+}
+
+static void w5100_readbuf_direct(struct w5100_priv *priv,
+				 u16 offset, u8 *buf, int len)
+{
+	u16 addr = W5100_RX_MEM_START + (offset & W5100_RX_MEM_MASK);
+	int i;
+
+	for (i = 0; i < len; i++, addr++) {
+		if (unlikely(addr > W5100_RX_MEM_END))
+			addr = W5100_RX_MEM_START;
+		*buf++ = w5100_read_direct(priv, addr);
+	}
+}
+
+static void w5100_writebuf_direct(struct w5100_priv *priv,
+				  u16 offset, u8 *buf, int len)
+{
+	u16 addr = W5100_TX_MEM_START + (offset & W5100_TX_MEM_MASK);
+	int i;
+
+	for (i = 0; i < len; i++, addr++) {
+		if (unlikely(addr > W5100_TX_MEM_END))
+			addr = W5100_TX_MEM_START;
+		w5100_write_direct(priv, addr, *buf++);
+	}
+}
+
+/*
+ * In indirect address mode host system indirectly accesses registers by
+ * using Indirect Mode Address Register (IDM_AR) and Indirect Mode Data
+ * Register (IDM_DR), which are directly mapped to Memory-Mapped I/O space.
+ * Mode Register (MR) is directly accessible.
+ *
+ * Only 0x04 bytes are required for memory space.
+ */
+#define W5100_IDM_AR		0x01   /* Indirect Mode Address Register */
+#define W5100_IDM_DR		0x03   /* Indirect Mode Data Register */
+
+static u8 w5100_read_indirect(struct w5100_priv *priv, u16 addr)
+{
+	unsigned long flags;
+	u8 data;
+
+	spin_lock_irqsave(&priv->reg_lock, flags);
+	w5100_write16_direct(priv, W5100_IDM_AR, addr);
+	mmiowb();
+	data = w5100_read_direct(priv, W5100_IDM_DR);
+	spin_unlock_irqrestore(&priv->reg_lock, flags);
+
+	return data;
+}
+
+static void w5100_write_indirect(struct w5100_priv *priv, u16 addr, u8 data)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->reg_lock, flags);
+	w5100_write16_direct(priv, W5100_IDM_AR, addr);
+	mmiowb();
+	w5100_write_direct(priv, W5100_IDM_DR, data);
+	mmiowb();
+	spin_unlock_irqrestore(&priv->reg_lock, flags);
+}
+
+static u16 w5100_read16_indirect(struct w5100_priv *priv, u16 addr)
+{
+	unsigned long flags;
+	u16 data;
+
+	spin_lock_irqsave(&priv->reg_lock, flags);
+	w5100_write16_direct(priv, W5100_IDM_AR, addr);
+	mmiowb();
+	data  = w5100_read_direct(priv, W5100_IDM_DR) << 8;
+	data |= w5100_read_direct(priv, W5100_IDM_DR);
+	spin_unlock_irqrestore(&priv->reg_lock, flags);
+
+	return data;
+}
+
+static void w5100_write16_indirect(struct w5100_priv *priv, u16 addr, u16 data)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->reg_lock, flags);
+	w5100_write16_direct(priv, W5100_IDM_AR, addr);
+	mmiowb();
+	w5100_write_direct(priv, W5100_IDM_DR, data >> 8);
+	w5100_write_direct(priv, W5100_IDM_DR, data);
+	mmiowb();
+	spin_unlock_irqrestore(&priv->reg_lock, flags);
+}
+
+static void w5100_readbuf_indirect(struct w5100_priv *priv,
+				   u16 offset, u8 *buf, int len)
+{
+	u16 addr = W5100_RX_MEM_START + (offset & W5100_RX_MEM_MASK);
+	unsigned long flags;
+	int i;
+
+	spin_lock_irqsave(&priv->reg_lock, flags);
+	w5100_write16_direct(priv, W5100_IDM_AR, addr);
+	mmiowb();
+
+	for (i = 0; i < len; i++, addr++) {
+		if (unlikely(addr > W5100_RX_MEM_END)) {
+			addr = W5100_RX_MEM_START;
+			w5100_write16_direct(priv, W5100_IDM_AR, addr);
+			mmiowb();
+		}
+		*buf++ = w5100_read_direct(priv, W5100_IDM_DR);
+	}
+	mmiowb();
+	spin_unlock_irqrestore(&priv->reg_lock, flags);
+}
+
+static void w5100_writebuf_indirect(struct w5100_priv *priv,
+				    u16 offset, u8 *buf, int len)
+{
+	u16 addr = W5100_TX_MEM_START + (offset & W5100_TX_MEM_MASK);
+	unsigned long flags;
+	int i;
+
+	spin_lock_irqsave(&priv->reg_lock, flags);
+	w5100_write16_direct(priv, W5100_IDM_AR, addr);
+	mmiowb();
+
+	for (i = 0; i < len; i++, addr++) {
+		if (unlikely(addr > W5100_TX_MEM_END)) {
+			addr = W5100_TX_MEM_START;
+			w5100_write16_direct(priv, W5100_IDM_AR, addr);
+			mmiowb();
+		}
+		w5100_write_direct(priv, W5100_IDM_DR, *buf++);
+	}
+	mmiowb();
+	spin_unlock_irqrestore(&priv->reg_lock, flags);
+}
+
+#if defined(CONFIG_WIZNET_BUS_DIRECT)
+#define w5100_read	w5100_read_direct
+#define w5100_write	w5100_write_direct
+#define w5100_read16	w5100_read16_direct
+#define w5100_write16	w5100_write16_direct
+#define w5100_readbuf	w5100_readbuf_direct
+#define w5100_writebuf	w5100_writebuf_direct
+
+#elif defined(CONFIG_WIZNET_BUS_INDIRECT)
+#define w5100_read	w5100_read_indirect
+#define w5100_write	w5100_write_indirect
+#define w5100_read16	w5100_read16_indirect
+#define w5100_write16	w5100_write16_indirect
+#define w5100_readbuf	w5100_readbuf_indirect
+#define w5100_writebuf	w5100_writebuf_indirect
+
+#else /* CONFIG_WIZNET_BUS_ANY */
+#define w5100_read	priv->read
+#define w5100_write	priv->write
+#define w5100_read16	priv->read16
+#define w5100_write16	priv->write16
+#define w5100_readbuf	priv->readbuf
+#define w5100_writebuf	priv->writebuf
+#endif
+
+static int w5100_command(struct w5100_priv *priv, u16 cmd)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(100);
+
+	w5100_write(priv, W5100_S0_CR, cmd);
+	mmiowb();
+
+	while (w5100_read(priv, W5100_S0_CR) != 0) {
+		if (time_after(jiffies, timeout))
+			return -EIO;
+		cpu_relax();
+	}
+
+	return 0;
+}
+
+static void w5100_write_macaddr(struct w5100_priv *priv)
+{
+	struct net_device *ndev = priv->ndev;
+	int i;
+
+	for (i = 0; i < ETH_ALEN; i++)
+		w5100_write(priv, W5100_SHAR + i, ndev->dev_addr[i]);
+	mmiowb();
+}
+
+static void w5100_hw_reset(struct w5100_priv *priv)
+{
+	w5100_write_direct(priv, W5100_MR, MR_RST);
+	mmiowb();
+	mdelay(5);
+	w5100_write_direct(priv, W5100_MR, priv->indirect ?
+				  MR_PB | MR_AI | MR_IND :
+				  MR_PB);
+	mmiowb();
+	w5100_write(priv, W5100_IMR, 0);
+	w5100_write_macaddr(priv);
+
+	/* Configure 16K of internal memory
+	 * as 8K RX buffer and 8K TX buffer
+	 */
+	w5100_write(priv, W5100_RMSR, 0x03);
+	w5100_write(priv, W5100_TMSR, 0x03);
+	mmiowb();
+}
+
+static void w5100_hw_start(struct w5100_priv *priv)
+{
+	w5100_write(priv, W5100_S0_MR, priv->promisc ?
+			  S0_MR_MACRAW : S0_MR_MACRAW_MF);
+	mmiowb();
+	w5100_command(priv, S0_CR_OPEN);
+	w5100_write(priv, W5100_IMR, IR_S0);
+	mmiowb();
+}
+
+static void w5100_hw_close(struct w5100_priv *priv)
+{
+	w5100_write(priv, W5100_IMR, 0);
+	mmiowb();
+	w5100_command(priv, S0_CR_CLOSE);
+}
+
+/***********************************************************************
+ *
+ *   Device driver functions / callbacks
+ *
+ ***********************************************************************/
+
+static void w5100_get_drvinfo(struct net_device *ndev,
+			      struct ethtool_drvinfo *info)
+{
+	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
+	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
+	strlcpy(info->bus_info, dev_name(ndev->dev.parent),
+		sizeof(info->bus_info));
+}
+
+static u32 w5100_get_link(struct net_device *ndev)
+{
+	struct w5100_priv *priv = netdev_priv(ndev);
+
+	if (gpio_is_valid(priv->link_gpio))
+		return !!gpio_get_value(priv->link_gpio);
+
+	return 1;
+}
+
+static u32 w5100_get_msglevel(struct net_device *ndev)
+{
+	struct w5100_priv *priv = netdev_priv(ndev);
+
+	return priv->msg_enable;
+}
+
+static void w5100_set_msglevel(struct net_device *ndev, u32 value)
+{
+	struct w5100_priv *priv = netdev_priv(ndev);
+
+	priv->msg_enable = value;
+}
+
+static int w5100_get_regs_len(struct net_device *ndev)
+{
+	return W5100_COMMON_REGS_LEN + W5100_S0_REGS_LEN;
+}
+
+static void w5100_get_regs(struct net_device *ndev,
+			   struct ethtool_regs *regs, void *_buf)
+{
+	struct w5100_priv *priv = netdev_priv(ndev);
+	u8 *buf = _buf;
+	u16 i;
+
+	regs->version = 1;
+	for (i = 0; i < W5100_COMMON_REGS_LEN; i++)
+		*buf++ = w5100_read(priv, W5100_COMMON_REGS + i);
+	for (i = 0; i < W5100_S0_REGS_LEN; i++)
+		*buf++ = w5100_read(priv, W5100_S0_REGS + i);
+}
+
+static void w5100_tx_timeout(struct net_device *ndev)
+{
+	struct w5100_priv *priv = netdev_priv(ndev);
+
+	netif_stop_queue(ndev);
+	w5100_hw_reset(priv);
+	w5100_hw_start(priv);
+	ndev->stats.tx_errors++;
+	ndev->trans_start = jiffies;
+	netif_wake_queue(ndev);
+}
+
+static int w5100_start_tx(struct sk_buff *skb, struct net_device *ndev)
+{
+	struct w5100_priv *priv = netdev_priv(ndev);
+	u16 offset;
+
+	if (IS_ENABLED(CONFIG_WIZNET_TX_FLOW))
+		netif_stop_queue(ndev);
+
+	offset = w5100_read16(priv, W5100_S0_TX_WR);
+	w5100_writebuf(priv, offset, skb->data, skb->len);
+	w5100_write16(priv, W5100_S0_TX_WR, offset + skb->len);
+	mmiowb();
+	ndev->stats.tx_bytes += skb->len;
+	ndev->stats.tx_packets++;
+	dev_kfree_skb(skb);
+
+	w5100_command(priv, S0_CR_SEND);
+
+	return NETDEV_TX_OK;
+}
+
+static int w5100_napi_poll(struct napi_struct *napi, int budget)
+{
+	struct w5100_priv *priv = container_of(napi, struct w5100_priv, napi);
+	struct net_device *ndev = priv->ndev;
+	struct sk_buff *skb;
+	int rx_count;
+	u16 rx_len;
+	u16 offset;
+	u8 header[2];
+
+	for (rx_count = 0; rx_count < budget; rx_count++) {
+		u16 rx_buf_len = w5100_read16(priv, W5100_S0_RX_RSR);
+		if (rx_buf_len == 0)
+			break;
+
+		offset = w5100_read16(priv, W5100_S0_RX_RD);
+		w5100_readbuf(priv, offset, header, 2);
+		rx_len = get_unaligned_be16(header) - 2;
+
+		skb = netdev_alloc_skb_ip_align(ndev, rx_len);
+		if (unlikely(!skb)) {
+			w5100_write16(priv, W5100_S0_RX_RD,
+					    offset + rx_buf_len);
+			w5100_command(priv, S0_CR_RECV);
+			ndev->stats.rx_dropped++;
+			return -ENOMEM;
+		}
+
+		skb_put(skb, rx_len);
+		w5100_readbuf(priv, offset + 2, skb->data, rx_len);
+		w5100_write16(priv, W5100_S0_RX_RD, offset + 2 + rx_len);
+		mmiowb();
+		w5100_command(priv, S0_CR_RECV);
+		skb->protocol = eth_type_trans(skb, ndev);
+
+		netif_receive_skb(skb);
+		ndev->stats.rx_packets++;
+		ndev->stats.rx_bytes += rx_len;
+	}
+
+	if (rx_count < budget) {
+		w5100_write(priv, W5100_IMR, IR_S0);
+		mmiowb();
+		napi_complete(napi);
+	}
+
+	return rx_count;
+}
+
+static irqreturn_t w5100_interrupt(int irq, void *ndev_instance)
+{
+	struct net_device *ndev = ndev_instance;
+	struct w5100_priv *priv = netdev_priv(ndev);
+
+	int ir = w5100_read(priv, W5100_S0_IR);
+	if (!ir)
+		return IRQ_NONE;
+	w5100_write(priv, W5100_S0_IR, ir);
+	mmiowb();
+
+	if (IS_ENABLED(CONFIG_WIZNET_TX_FLOW) && (ir & S0_IR_SENDOK)) {
+		netif_dbg(priv, tx_done, ndev, "tx done\n");
+		netif_wake_queue(ndev);
+	}
+
+	if (ir & S0_IR_RECV) {
+		if (napi_schedule_prep(&priv->napi)) {
+			w5100_write(priv, W5100_IMR, 0);
+			mmiowb();
+			__napi_schedule(&priv->napi);
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t w5100_detect_link(int irq, void *ndev_instance)
+{
+	struct net_device *ndev = ndev_instance;
+	struct w5100_priv *priv = netdev_priv(ndev);
+
+	if (netif_running(ndev)) {
+		if (gpio_get_value(priv->link_gpio) != 0) {
+			netif_info(priv, link, ndev, "link is up\n");
+			netif_carrier_on(ndev);
+		} else {
+			netif_info(priv, link, ndev, "link is down\n");
+			netif_carrier_off(ndev);
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void w5100_set_rx_mode(struct net_device *ndev)
+{
+	struct w5100_priv *priv = netdev_priv(ndev);
+	bool set_promisc = (ndev->flags & IFF_PROMISC) != 0;
+
+	if (priv->promisc != set_promisc) {
+		priv->promisc = set_promisc;
+		w5100_hw_start(priv);
+	}
+}
+
+static int w5100_set_macaddr(struct net_device *ndev, void *addr)
+{
+	struct w5100_priv *priv = netdev_priv(ndev);
+	struct sockaddr *sock_addr = addr;
+
+	if (!is_valid_ether_addr(sock_addr->sa_data))
+		return -EADDRNOTAVAIL;
+	memcpy(ndev->dev_addr, sock_addr->sa_data, ETH_ALEN);
+	ndev->addr_assign_type &= ~NET_ADDR_RANDOM;
+	w5100_write_macaddr(priv);
+	return 0;
+}
+
+static int w5100_open(struct net_device *ndev)
+{
+	struct w5100_priv *priv = netdev_priv(ndev);
+
+	netif_info(priv, ifup, ndev, "enabling\n");
+	if (!is_valid_ether_addr(ndev->dev_addr))
+		return -EINVAL;
+	w5100_hw_start(priv);
+	napi_enable(&priv->napi);
+	netif_start_queue(ndev);
+	if (!gpio_is_valid(priv->link_gpio) ||
+	    gpio_get_value(priv->link_gpio) != 0)
+		netif_carrier_on(ndev);
+	return 0;
+}
+
+static int w5100_stop(struct net_device *ndev)
+{
+	struct w5100_priv *priv = netdev_priv(ndev);
+
+	netif_info(priv, ifdown, ndev, "shutting down\n");
+	w5100_hw_close(priv);
+	netif_carrier_off(ndev);
+	netif_stop_queue(ndev);
+	napi_disable(&priv->napi);
+	return 0;
+}
+
+static const struct ethtool_ops w5100_ethtool_ops = {
+	.get_drvinfo		= w5100_get_drvinfo,
+	.get_msglevel		= w5100_get_msglevel,
+	.set_msglevel		= w5100_set_msglevel,
+	.get_link		= w5100_get_link,
+	.get_regs_len		= w5100_get_regs_len,
+	.get_regs		= w5100_get_regs,
+};
+
+static const struct net_device_ops w5100_netdev_ops = {
+	.ndo_open		= w5100_open,
+	.ndo_stop		= w5100_stop,
+	.ndo_start_xmit		= w5100_start_tx,
+	.ndo_tx_timeout		= w5100_tx_timeout,
+	.ndo_set_rx_mode	= w5100_set_rx_mode,
+	.ndo_set_mac_address	= w5100_set_macaddr,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_change_mtu		= eth_change_mtu,
+};
+
+static int __devinit w5100_hw_probe(struct platform_device *pdev)
+{
+	struct wiznet_platform_data *data = pdev->dev.platform_data;
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct w5100_priv *priv = netdev_priv(ndev);
+	const char *name = netdev_name(ndev);
+	struct resource *mem;
+	int mem_size;
+	int irq;
+	int ret;
+
+	if (data && is_valid_ether_addr(data->mac_addr)) {
+		memcpy(ndev->dev_addr, data->mac_addr, ETH_ALEN);
+	} else {
+		random_ether_addr(ndev->dev_addr);
+		ndev->addr_assign_type |= NET_ADDR_RANDOM;
+	}
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem)
+		return -ENXIO;
+	mem_size = resource_size(mem);
+	if (!devm_request_mem_region(&pdev->dev, mem->start, mem_size, name))
+		return -EBUSY;
+	priv->base = devm_ioremap(&pdev->dev, mem->start, mem_size);
+	if (!priv->base)
+		return -EBUSY;
+
+	spin_lock_init(&priv->reg_lock);
+	priv->indirect = mem_size < W5100_BUS_DIRECT_SIZE;
+	if (priv->indirect) {
+		priv->read     = w5100_read_indirect;
+		priv->write    = w5100_write_indirect;
+		priv->read16   = w5100_read16_indirect;
+		priv->write16  = w5100_write16_indirect;
+		priv->readbuf  = w5100_readbuf_indirect;
+		priv->writebuf = w5100_writebuf_indirect;
+	} else {
+		priv->read     = w5100_read_direct;
+		priv->write    = w5100_write_direct;
+		priv->read16   = w5100_read16_direct;
+		priv->write16  = w5100_write16_direct;
+		priv->readbuf  = w5100_readbuf_direct;
+		priv->writebuf = w5100_writebuf_direct;
+	}
+
+	w5100_hw_reset(priv);
+	if (w5100_read16(priv, W5100_RTR) != RTR_DEFAULT)
+		return -ENODEV;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+	ret = request_irq(irq, w5100_interrupt,
+			  IRQ_TYPE_LEVEL_LOW, name, ndev);
+	if (ret < 0)
+		return ret;
+	priv->irq = irq;
+
+	priv->link_gpio = data->link_gpio;
+	if (gpio_is_valid(priv->link_gpio)) {
+		char *link_name = devm_kzalloc(&pdev->dev, 16, GFP_KERNEL);
+		if (!link_name)
+			return -ENOMEM;
+		snprintf(link_name, 16, "%s-link", name);
+		priv->link_irq = gpio_to_irq(priv->link_gpio);
+		if (request_any_context_irq(priv->link_irq, w5100_detect_link,
+				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+				link_name, priv->ndev) < 0)
+			priv->link_gpio = -EINVAL;
+	}
+
+	netdev_info(ndev, "at 0x%llx irq %d\n", (u64)mem->start, irq);
+	return 0;
+}
+
+static int __devinit w5100_probe(struct platform_device *pdev)
+{
+	struct w5100_priv *priv;
+	struct net_device *ndev;
+	int err;
+
+	ndev = alloc_etherdev(sizeof(*priv));
+	if (!ndev)
+		return -ENOMEM;
+	SET_NETDEV_DEV(ndev, &pdev->dev);
+	platform_set_drvdata(pdev, ndev);
+	priv = netdev_priv(ndev);
+	priv->ndev = ndev;
+
+	ether_setup(ndev);
+	ndev->netdev_ops = &w5100_netdev_ops;
+	ndev->ethtool_ops = &w5100_ethtool_ops;
+	ndev->watchdog_timeo = HZ;
+	netif_napi_add(ndev, &priv->napi, w5100_napi_poll, 16);
+
+	/* This chip doesn't support VLAN packets with normal MTU,
+	 * so disable VLAN for this device.
+	 */
+	ndev->features |= NETIF_F_VLAN_CHALLENGED;
+
+	err = register_netdev(ndev);
+	if (err < 0)
+		goto err_register;
+
+	err = w5100_hw_probe(pdev);
+	if (err < 0)
+		goto err_hw_probe;
+
+	return 0;
+
+err_hw_probe:
+	unregister_netdev(ndev);
+err_register:
+	free_netdev(ndev);
+	platform_set_drvdata(pdev, NULL);
+	return err;
+}
+
+static int __devexit w5100_remove(struct platform_device *pdev)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct w5100_priv *priv = netdev_priv(ndev);
+
+	w5100_hw_reset(priv);
+	free_irq(priv->irq, ndev);
+	if (gpio_is_valid(priv->link_gpio))
+		free_irq(priv->link_irq, ndev);
+
+	unregister_netdev(ndev);
+	free_netdev(ndev);
+	platform_set_drvdata(pdev, NULL);
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int w5100_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct w5100_priv *priv = netdev_priv(ndev);
+
+	if (netif_running(ndev)) {
+		netif_carrier_off(ndev);
+		netif_device_detach(ndev);
+
+		w5100_hw_close(priv);
+	}
+	return 0;
+}
+
+static int w5100_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct w5100_priv *priv = netdev_priv(ndev);
+
+	if (netif_running(ndev)) {
+		w5100_hw_reset(priv);
+		w5100_hw_start(priv);
+
+		netif_device_attach(ndev);
+		if (!gpio_is_valid(priv->link_gpio) ||
+		    gpio_get_value(priv->link_gpio) != 0)
+			netif_carrier_on(ndev);
+	}
+	return 0;
+}
+#endif /* CONFIG_PM */
+
+static SIMPLE_DEV_PM_OPS(w5100_pm_ops, w5100_suspend, w5100_resume);
+
+static struct platform_driver w5100_driver = {
+	.driver		= {
+		.name	= DRV_NAME,
+		.owner	= THIS_MODULE,
+		.pm	= &w5100_pm_ops,
+	},
+	.probe		= w5100_probe,
+	.remove		= __devexit_p(w5100_remove),
+};
+
+module_platform_driver(w5100_driver);