drivers/net/ethernet/wiznet/w5300.c - kernel/msm-4.9 - Gitiles

 /*
  * Ethernet driver for the WIZnet W5300 chip.
  *
  * Copyright (C) 2008-2009 WIZnet Co.,Ltd.
  * Copyright (C) 2011 Taehun Kim <kth3321 <at> gmail.com>
  * 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/irq.h>
 #include <linux/gpio.h>

 #define DRV_NAME	"w5300"
 #define DRV_VERSION	"2012-04-04"

 MODULE_DESCRIPTION("WIZnet W5300 Ethernet driver v"DRV_VERSION);
 MODULE_AUTHOR("Mike Sinkovsky <msink@permonline.ru>");
 MODULE_ALIAS("platform:"DRV_NAME);
 MODULE_LICENSE("GPL");

 /*
  * Registers
  */
 #define W5300_MR		0x0000	/* Mode Register */
 #define   MR_DBW		  (1 << 15) /* Data bus width */
 #define   MR_MPF		  (1 << 14) /* Mac layer pause frame */
 #define   MR_WDF(n)		  (((n)&7)<<11) /* Write data fetch time */
 #define   MR_RDH		  (1 << 10) /* Read data hold time */
 #define   MR_FS			  (1 << 8)  /* FIFO swap */
 #define   MR_RST		  (1 << 7)  /* S/W reset */
 #define   MR_PB			  (1 << 4)  /* Ping block */
 #define   MR_DBS		  (1 << 2)  /* Data bus swap */
 #define   MR_IND		  (1 << 0)  /* Indirect mode */
 #define W5300_IR		0x0002	/* Interrupt Register */
 #define W5300_IMR		0x0004	/* Interrupt Mask Register */
 #define   IR_S0			  0x0001  /* S0 interrupt */
 #define W5300_SHARL		0x0008	/* Source MAC address (0123) */
 #define W5300_SHARH		0x000c	/* Source MAC address (45) */
 #define W5300_TMSRL		0x0020	/* Transmit Memory Size (0123) */
 #define W5300_TMSRH		0x0024	/* Transmit Memory Size (4567) */
 #define W5300_RMSRL		0x0028	/* Receive Memory Size (0123) */
 #define W5300_RMSRH		0x002c	/* Receive Memory Size (4567) */
 #define W5300_MTYPE		0x0030	/* Memory Type */
 #define W5300_IDR		0x00fe	/* Chip ID register */
 #define   IDR_W5300		  0x5300  /* =0x5300 for WIZnet W5300 */
 #define W5300_S0_MR		0x0200	/* S0 Mode Register */
 #define   S0_MR_CLOSED		  0x0000  /* Close mode */
 #define   S0_MR_MACRAW		  0x0004  /* MAC RAW mode (promiscous) */
 #define   S0_MR_MACRAW_MF	  0x0044  /* MAC RAW mode (filtered) */
 #define W5300_S0_CR		0x0202	/* S0 Command Register */
 #define   S0_CR_OPEN		  0x0001  /* OPEN command */
 #define   S0_CR_CLOSE		  0x0010  /* CLOSE command */
 #define   S0_CR_SEND		  0x0020  /* SEND command */
 #define   S0_CR_RECV		  0x0040  /* RECV command */
 #define W5300_S0_IMR		0x0204	/* S0 Interrupt Mask Register */
 #define W5300_S0_IR		0x0206	/* S0 Interrupt Register */
 #define   S0_IR_RECV		  0x0004  /* Receive interrupt */
 #define   S0_IR_SENDOK		  0x0010  /* Send OK interrupt */
 #define W5300_S0_SSR		0x0208	/* S0 Socket Status Register */
 #define W5300_S0_TX_WRSR	0x0220	/* S0 TX Write Size Register */
 #define W5300_S0_TX_FSR		0x0224	/* S0 TX Free Size Register */
 #define W5300_S0_RX_RSR		0x0228	/* S0 Received data Size */
 #define W5300_S0_TX_FIFO	0x022e	/* S0 Transmit FIFO */
 #define W5300_S0_RX_FIFO	0x0230	/* S0 Receive FIFO */
 #define W5300_REGS_LEN		0x0400

 /*
  * Device driver private data structure
  */
 struct w5300_priv {
 	void __iomem *base;
 	spinlock_t reg_lock;
 	bool indirect;
 	u16  (*read) (struct w5300_priv *priv, u16 addr);
 	void (*write)(struct w5300_priv *priv, u16 addr, u16 data);
 	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 W5300 registers
  * after mapping to Memory-Mapped I/O space.
  *
  * 0x400 bytes are required for memory space.
  */
 static inline u16 w5300_read_direct(struct w5300_priv *priv, u16 addr)
 {
 	return ioread16(priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
 }

 static inline void w5300_write_direct(struct w5300_priv *priv,
 				      u16 addr, u16 data)
 {
 	iowrite16(data, priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
 }

 /*
  * 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 0x06 bytes are required for memory space.
  */
 #define W5300_IDM_AR		0x0002	 /* Indirect Mode Address */
 #define W5300_IDM_DR		0x0004	 /* Indirect Mode Data */

 static u16 w5300_read_indirect(struct w5300_priv *priv, u16 addr)
 {
 	unsigned long flags;
 	u16 data;

 	spin_lock_irqsave(&priv->reg_lock, flags);
 	w5300_write_direct(priv, W5300_IDM_AR, addr);
 	mmiowb();
 	data = w5300_read_direct(priv, W5300_IDM_DR);
 	spin_unlock_irqrestore(&priv->reg_lock, flags);

 	return data;
 }

 static void w5300_write_indirect(struct w5300_priv *priv, u16 addr, u16 data)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&priv->reg_lock, flags);
 	w5300_write_direct(priv, W5300_IDM_AR, addr);
 	mmiowb();
 	w5300_write_direct(priv, W5300_IDM_DR, data);
 	mmiowb();
 	spin_unlock_irqrestore(&priv->reg_lock, flags);
 }

 #if defined(CONFIG_WIZNET_BUS_DIRECT)
 #define w5300_read	w5300_read_direct
 #define w5300_write	w5300_write_direct

 #elif defined(CONFIG_WIZNET_BUS_INDIRECT)
 #define w5300_read	w5300_read_indirect
 #define w5300_write	w5300_write_indirect

 #else /* CONFIG_WIZNET_BUS_ANY */
 #define w5300_read	priv->read
 #define w5300_write	priv->write
 #endif

 static u32 w5300_read32(struct w5300_priv *priv, u16 addr)
 {
 	u32 data;
 	data  = w5300_read(priv, addr) << 16;
 	data |= w5300_read(priv, addr + 2);
 	return data;
 }

 static void w5300_write32(struct w5300_priv *priv, u16 addr, u32 data)
 {
 	w5300_write(priv, addr, data >> 16);
 	w5300_write(priv, addr + 2, data);
 }

 static int w5300_command(struct w5300_priv *priv, u16 cmd)
 {
 	unsigned long timeout = jiffies + msecs_to_jiffies(100);

 	w5300_write(priv, W5300_S0_CR, cmd);
 	mmiowb();

 	while (w5300_read(priv, W5300_S0_CR) != 0) {
 		if (time_after(jiffies, timeout))
 			return -EIO;
 		cpu_relax();
 	}

 	return 0;
 }

 static void w5300_read_frame(struct w5300_priv *priv, u8 *buf, int len)
 {
 	u16 fifo;
 	int i;

 	for (i = 0; i < len; i += 2) {
 		fifo = w5300_read(priv, W5300_S0_RX_FIFO);
 		*buf++ = fifo >> 8;
 		*buf++ = fifo;
 	}
 	fifo = w5300_read(priv, W5300_S0_RX_FIFO);
 	fifo = w5300_read(priv, W5300_S0_RX_FIFO);
 }

 static void w5300_write_frame(struct w5300_priv *priv, u8 *buf, int len)
 {
 	u16 fifo;
 	int i;

 	for (i = 0; i < len; i += 2) {
 		fifo  = *buf++ << 8;
 		fifo |= *buf++;
 		w5300_write(priv, W5300_S0_TX_FIFO, fifo);
 	}
 	w5300_write32(priv, W5300_S0_TX_WRSR, len);
 }

 static void w5300_write_macaddr(struct w5300_priv *priv)
 {
 	struct net_device *ndev = priv->ndev;
 	w5300_write32(priv, W5300_SHARL,
 		      ndev->dev_addr[0] << 24 |
 		      ndev->dev_addr[1] << 16 |
 		      ndev->dev_addr[2] << 8 |
 		      ndev->dev_addr[3]);
 	w5300_write(priv, W5300_SHARH,
 		      ndev->dev_addr[4] << 8 |
 		      ndev->dev_addr[5]);
 	mmiowb();
 }

 static void w5300_hw_reset(struct w5300_priv *priv)
 {
 	w5300_write_direct(priv, W5300_MR, MR_RST);
 	mmiowb();
 	mdelay(5);
 	w5300_write_direct(priv, W5300_MR, priv->indirect ?
 				 MR_WDF(7) | MR_PB | MR_IND :
 				 MR_WDF(7) | MR_PB);
 	mmiowb();
 	w5300_write(priv, W5300_IMR, 0);
 	w5300_write_macaddr(priv);

 	/* Configure 128K of internal memory
 	 * as 64K RX fifo and 64K TX fifo
 	 */
 	w5300_write32(priv, W5300_RMSRL, 64 << 24);
 	w5300_write32(priv, W5300_RMSRH, 0);
 	w5300_write32(priv, W5300_TMSRL, 64 << 24);
 	w5300_write32(priv, W5300_TMSRH, 0);
 	w5300_write(priv, W5300_MTYPE, 0x00ff);
 	mmiowb();
 }

 static void w5300_hw_start(struct w5300_priv *priv)
 {
 	w5300_write(priv, W5300_S0_MR, priv->promisc ?
 			  S0_MR_MACRAW : S0_MR_MACRAW_MF);
 	mmiowb();
 	w5300_command(priv, S0_CR_OPEN);
 	w5300_write(priv, W5300_S0_IMR, S0_IR_RECV | S0_IR_SENDOK);
 	w5300_write(priv, W5300_IMR, IR_S0);
 	mmiowb();
 }

 static void w5300_hw_close(struct w5300_priv *priv)
 {
 	w5300_write(priv, W5300_IMR, 0);
 	mmiowb();
 	w5300_command(priv, S0_CR_CLOSE);
 }

 /***********************************************************************
  *
  *   Device driver functions / callbacks
  *
  ***********************************************************************/

 static void w5300_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 w5300_get_link(struct net_device *ndev)
 {
 	struct w5300_priv *priv = netdev_priv(ndev);

 	if (gpio_is_valid(priv->link_gpio))
 		return !!gpio_get_value(priv->link_gpio);

 	return 1;
 }

 static u32 w5300_get_msglevel(struct net_device *ndev)
 {
 	struct w5300_priv *priv = netdev_priv(ndev);

 	return priv->msg_enable;
 }

 static void w5300_set_msglevel(struct net_device *ndev, u32 value)
 {
 	struct w5300_priv *priv = netdev_priv(ndev);

 	priv->msg_enable = value;
 }

 static int w5300_get_regs_len(struct net_device *ndev)
 {
 	return W5300_REGS_LEN;
 }

 static void w5300_get_regs(struct net_device *ndev,
 			   struct ethtool_regs *regs, void *_buf)
 {
 	struct w5300_priv *priv = netdev_priv(ndev);
 	u8 *buf = _buf;
 	u16 addr;
 	u16 data;

 	regs->version = 1;
 	for (addr = 0; addr < W5300_REGS_LEN; addr += 2) {
 		switch (addr & 0x23f) {
 		case W5300_S0_TX_FIFO: /* cannot read TX_FIFO */
 		case W5300_S0_RX_FIFO: /* cannot read RX_FIFO */
 			data = 0xffff;
 			break;
 		default:
 			data = w5300_read(priv, addr);
 			break;
 		}
 		*buf++ = data >> 8;
 		*buf++ = data;
 	}
 }

 static void w5300_tx_timeout(struct net_device *ndev)
 {
 	struct w5300_priv *priv = netdev_priv(ndev);

 	netif_stop_queue(ndev);
 	w5300_hw_reset(priv);
 	w5300_hw_start(priv);
 	ndev->stats.tx_errors++;
 	ndev->trans_start = jiffies;
 	netif_wake_queue(ndev);
 }

 static int w5300_start_tx(struct sk_buff *skb, struct net_device *ndev)
 {
 	struct w5300_priv *priv = netdev_priv(ndev);

 	netif_stop_queue(ndev);

 	w5300_write_frame(priv, skb->data, skb->len);
 	mmiowb();
 	ndev->stats.tx_packets++;
 	ndev->stats.tx_bytes += skb->len;
 	dev_kfree_skb(skb);
 	netif_dbg(priv, tx_queued, ndev, "tx queued\n");

 	w5300_command(priv, S0_CR_SEND);

 	return NETDEV_TX_OK;
 }

 static int w5300_napi_poll(struct napi_struct *napi, int budget)
 {
 	struct w5300_priv *priv = container_of(napi, struct w5300_priv, napi);
 	struct net_device *ndev = priv->ndev;
 	struct sk_buff *skb;
 	int rx_count;
 	u16 rx_len;

 	for (rx_count = 0; rx_count < budget; rx_count++) {
 		u32 rx_fifo_len = w5300_read32(priv, W5300_S0_RX_RSR);
 		if (rx_fifo_len == 0)
 			break;

 		rx_len = w5300_read(priv, W5300_S0_RX_FIFO);

 		skb = netdev_alloc_skb_ip_align(ndev, roundup(rx_len, 2));
 		if (unlikely(!skb)) {
 			u32 i;
 			for (i = 0; i < rx_fifo_len; i += 2)
 				w5300_read(priv, W5300_S0_RX_FIFO);
 			ndev->stats.rx_dropped++;
 			return -ENOMEM;
 		}

 		skb_put(skb, rx_len);
 		w5300_read_frame(priv, skb->data, rx_len);
 		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) {
 		w5300_write(priv, W5300_IMR, IR_S0);
 		mmiowb();
 		napi_complete(napi);
 	}

 	return rx_count;
 }

 static irqreturn_t w5300_interrupt(int irq, void *ndev_instance)
 {
 	struct net_device *ndev = ndev_instance;
 	struct w5300_priv *priv = netdev_priv(ndev);

 	int ir = w5300_read(priv, W5300_S0_IR);
 	if (!ir)
 		return IRQ_NONE;
 	w5300_write(priv, W5300_S0_IR, ir);
 	mmiowb();

 	if (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)) {
 			w5300_write(priv, W5300_IMR, 0);
 			mmiowb();
 			__napi_schedule(&priv->napi);
 		}
 	}

 	return IRQ_HANDLED;
 }

 static irqreturn_t w5300_detect_link(int irq, void *ndev_instance)
 {
 	struct net_device *ndev = ndev_instance;
 	struct w5300_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 w5300_set_rx_mode(struct net_device *ndev)
 {
 	struct w5300_priv *priv = netdev_priv(ndev);
 	bool set_promisc = (ndev->flags & IFF_PROMISC) != 0;

 	if (priv->promisc != set_promisc) {
 		priv->promisc = set_promisc;
 		w5300_hw_start(priv);
 	}
 }

 static int w5300_set_macaddr(struct net_device *ndev, void *addr)
 {
 	struct w5300_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);
 	w5300_write_macaddr(priv);
 	return 0;
 }

 static int w5300_open(struct net_device *ndev)
 {
 	struct w5300_priv *priv = netdev_priv(ndev);

 	netif_info(priv, ifup, ndev, "enabling\n");
 	w5300_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 w5300_stop(struct net_device *ndev)
 {
 	struct w5300_priv *priv = netdev_priv(ndev);

 	netif_info(priv, ifdown, ndev, "shutting down\n");
 	w5300_hw_close(priv);
 	netif_carrier_off(ndev);
 	netif_stop_queue(ndev);
 	napi_disable(&priv->napi);
 	return 0;
 }

 static const struct ethtool_ops w5300_ethtool_ops = {
 	.get_drvinfo		= w5300_get_drvinfo,
 	.get_msglevel		= w5300_get_msglevel,
 	.set_msglevel		= w5300_set_msglevel,
 	.get_link		= w5300_get_link,
 	.get_regs_len		= w5300_get_regs_len,
 	.get_regs		= w5300_get_regs,
 };

 static const struct net_device_ops w5300_netdev_ops = {
 	.ndo_open		= w5300_open,
 	.ndo_stop		= w5300_stop,
 	.ndo_start_xmit		= w5300_start_tx,
 	.ndo_tx_timeout		= w5300_tx_timeout,
 	.ndo_set_rx_mode	= w5300_set_rx_mode,
 	.ndo_set_mac_address	= w5300_set_macaddr,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_change_mtu		= eth_change_mtu,
 };

 static int w5300_hw_probe(struct platform_device *pdev)
 {
 	struct wiznet_platform_data *data = dev_get_platdata(&pdev->dev);
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct w5300_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 {
 		eth_hw_addr_random(ndev);
 	}

 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	priv->base = devm_ioremap_resource(&pdev->dev, mem);
 	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);

 	mem_size = resource_size(mem);

 	spin_lock_init(&priv->reg_lock);
 	priv->indirect = mem_size < W5300_BUS_DIRECT_SIZE;
 	if (priv->indirect) {
 		priv->read  = w5300_read_indirect;
 		priv->write = w5300_write_indirect;
 	} else {
 		priv->read  = w5300_read_direct;
 		priv->write = w5300_write_direct;
 	}

 	w5300_hw_reset(priv);
 	if (w5300_read(priv, W5300_IDR) != IDR_W5300)
 		return -ENODEV;

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;
 	ret = request_irq(irq, w5300_interrupt,
 			  IRQ_TYPE_LEVEL_LOW, name, ndev);
 	if (ret < 0)
 		return ret;
 	priv->irq = irq;

 	priv->link_gpio = data ? data->link_gpio : -EINVAL;
 	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, w5300_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 w5300_probe(struct platform_device *pdev)
 {
 	struct w5300_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;

 	ndev->netdev_ops = &w5300_netdev_ops;
 	ndev->ethtool_ops = &w5300_ethtool_ops;
 	ndev->watchdog_timeo = HZ;
 	netif_napi_add(ndev, &priv->napi, w5300_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 = w5300_hw_probe(pdev);
 	if (err < 0)
 		goto err_hw_probe;

 	return 0;

 err_hw_probe:
 	unregister_netdev(ndev);
 err_register:
 	free_netdev(ndev);
 	return err;
 }

 static int w5300_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct w5300_priv *priv = netdev_priv(ndev);

 	w5300_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);
 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int w5300_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct w5300_priv *priv = netdev_priv(ndev);

 	if (netif_running(ndev)) {
 		netif_carrier_off(ndev);
 		netif_device_detach(ndev);

 		w5300_hw_close(priv);
 	}
 	return 0;
 }

 static int w5300_resume(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct w5300_priv *priv = netdev_priv(ndev);

 	if (!netif_running(ndev)) {
 		w5300_hw_reset(priv);
 		w5300_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_SLEEP */

 static SIMPLE_DEV_PM_OPS(w5300_pm_ops, w5300_suspend, w5300_resume);

 static struct platform_driver w5300_driver = {
 	.driver		= {
 		.name	= DRV_NAME,
 		.pm	= &w5300_pm_ops,
 	},
 	.probe		= w5300_probe,
 	.remove		= w5300_remove,
 };

 module_platform_driver(w5300_driver);
	/*
	* Ethernet driver for the WIZnet W5300 chip.
	*
	* Copyright (C) 2008-2009 WIZnet Co.,Ltd.
	* Copyright (C) 2011 Taehun Kim <kth3321 <at> gmail.com>
	* 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/irq.h>
	#include <linux/gpio.h>

	#define DRV_NAME "w5300"
	#define DRV_VERSION "2012-04-04"

	MODULE_DESCRIPTION("WIZnet W5300 Ethernet driver v"DRV_VERSION);
	MODULE_AUTHOR("Mike Sinkovsky <msink@permonline.ru>");
	MODULE_ALIAS("platform:"DRV_NAME);
	MODULE_LICENSE("GPL");

	/*
	* Registers
	*/
	#define W5300_MR 0x0000 /* Mode Register */
	#define MR_DBW (1 << 15) /* Data bus width */
	#define MR_MPF (1 << 14) /* Mac layer pause frame */
	#define MR_WDF(n) (((n)&7)<<11) /* Write data fetch time */
	#define MR_RDH (1 << 10) /* Read data hold time */
	#define MR_FS (1 << 8) /* FIFO swap */
	#define MR_RST (1 << 7) /* S/W reset */
	#define MR_PB (1 << 4) /* Ping block */
	#define MR_DBS (1 << 2) /* Data bus swap */
	#define MR_IND (1 << 0) /* Indirect mode */
	#define W5300_IR 0x0002 /* Interrupt Register */
	#define W5300_IMR 0x0004 /* Interrupt Mask Register */
	#define IR_S0 0x0001 /* S0 interrupt */
	#define W5300_SHARL 0x0008 /* Source MAC address (0123) */
	#define W5300_SHARH 0x000c /* Source MAC address (45) */
	#define W5300_TMSRL 0x0020 /* Transmit Memory Size (0123) */
	#define W5300_TMSRH 0x0024 /* Transmit Memory Size (4567) */
	#define W5300_RMSRL 0x0028 /* Receive Memory Size (0123) */
	#define W5300_RMSRH 0x002c /* Receive Memory Size (4567) */
	#define W5300_MTYPE 0x0030 /* Memory Type */
	#define W5300_IDR 0x00fe /* Chip ID register */
	#define IDR_W5300 0x5300 /* =0x5300 for WIZnet W5300 */
	#define W5300_S0_MR 0x0200 /* S0 Mode Register */
	#define S0_MR_CLOSED 0x0000 /* Close mode */
	#define S0_MR_MACRAW 0x0004 /* MAC RAW mode (promiscous) */
	#define S0_MR_MACRAW_MF 0x0044 /* MAC RAW mode (filtered) */
	#define W5300_S0_CR 0x0202 /* S0 Command Register */
	#define S0_CR_OPEN 0x0001 /* OPEN command */
	#define S0_CR_CLOSE 0x0010 /* CLOSE command */
	#define S0_CR_SEND 0x0020 /* SEND command */
	#define S0_CR_RECV 0x0040 /* RECV command */
	#define W5300_S0_IMR 0x0204 /* S0 Interrupt Mask Register */
	#define W5300_S0_IR 0x0206 /* S0 Interrupt Register */
	#define S0_IR_RECV 0x0004 /* Receive interrupt */
	#define S0_IR_SENDOK 0x0010 /* Send OK interrupt */
	#define W5300_S0_SSR 0x0208 /* S0 Socket Status Register */
	#define W5300_S0_TX_WRSR 0x0220 /* S0 TX Write Size Register */
	#define W5300_S0_TX_FSR 0x0224 /* S0 TX Free Size Register */
	#define W5300_S0_RX_RSR 0x0228 /* S0 Received data Size */
	#define W5300_S0_TX_FIFO 0x022e /* S0 Transmit FIFO */
	#define W5300_S0_RX_FIFO 0x0230 /* S0 Receive FIFO */
	#define W5300_REGS_LEN 0x0400

	/*
	* Device driver private data structure
	*/
	struct w5300_priv {
	void __iomem *base;
	spinlock_t reg_lock;
	bool indirect;
	u16 (read) (struct w5300_priv priv, u16 addr);
	void (write)(struct w5300_priv priv, u16 addr, u16 data);
	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 W5300 registers
	* after mapping to Memory-Mapped I/O space.
	*
	* 0x400 bytes are required for memory space.
	*/
	static inline u16 w5300_read_direct(struct w5300_priv *priv, u16 addr)
	{
	return ioread16(priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
	}

	static inline void w5300_write_direct(struct w5300_priv *priv,
	u16 addr, u16 data)
	{
	iowrite16(data, priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
	}

	/*
	* 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 0x06 bytes are required for memory space.
	*/
	#define W5300_IDM_AR 0x0002 /* Indirect Mode Address */
	#define W5300_IDM_DR 0x0004 /* Indirect Mode Data */

	static u16 w5300_read_indirect(struct w5300_priv *priv, u16 addr)
	{
	unsigned long flags;
	u16 data;

	spin_lock_irqsave(&priv->reg_lock, flags);
	w5300_write_direct(priv, W5300_IDM_AR, addr);
	mmiowb();
	data = w5300_read_direct(priv, W5300_IDM_DR);
	spin_unlock_irqrestore(&priv->reg_lock, flags);

	return data;
	}

	static void w5300_write_indirect(struct w5300_priv *priv, u16 addr, u16 data)
	{
	unsigned long flags;

	spin_lock_irqsave(&priv->reg_lock, flags);
	w5300_write_direct(priv, W5300_IDM_AR, addr);
	mmiowb();
	w5300_write_direct(priv, W5300_IDM_DR, data);
	mmiowb();
	spin_unlock_irqrestore(&priv->reg_lock, flags);
	}

	#if defined(CONFIG_WIZNET_BUS_DIRECT)
	#define w5300_read w5300_read_direct
	#define w5300_write w5300_write_direct

	#elif defined(CONFIG_WIZNET_BUS_INDIRECT)
	#define w5300_read w5300_read_indirect
	#define w5300_write w5300_write_indirect

	#else /* CONFIG_WIZNET_BUS_ANY */
	#define w5300_read priv->read
	#define w5300_write priv->write
	#endif

	static u32 w5300_read32(struct w5300_priv *priv, u16 addr)
	{
	u32 data;
	data = w5300_read(priv, addr) << 16;
	data \|= w5300_read(priv, addr + 2);
	return data;
	}

	static void w5300_write32(struct w5300_priv *priv, u16 addr, u32 data)
	{
	w5300_write(priv, addr, data >> 16);
	w5300_write(priv, addr + 2, data);
	}

	static int w5300_command(struct w5300_priv *priv, u16 cmd)
	{
	unsigned long timeout = jiffies + msecs_to_jiffies(100);

	w5300_write(priv, W5300_S0_CR, cmd);
	mmiowb();

	while (w5300_read(priv, W5300_S0_CR) != 0) {
	if (time_after(jiffies, timeout))
	return -EIO;
	cpu_relax();
	}

	return 0;
	}

	static void w5300_read_frame(struct w5300_priv priv, u8 buf, int len)
	{
	u16 fifo;
	int i;

	for (i = 0; i < len; i += 2) {
	fifo = w5300_read(priv, W5300_S0_RX_FIFO);
	*buf++ = fifo >> 8;
	*buf++ = fifo;
	}
	fifo = w5300_read(priv, W5300_S0_RX_FIFO);
	fifo = w5300_read(priv, W5300_S0_RX_FIFO);
	}

	static void w5300_write_frame(struct w5300_priv priv, u8 buf, int len)
	{
	u16 fifo;
	int i;

	for (i = 0; i < len; i += 2) {
	fifo = *buf++ << 8;
	fifo \|= *buf++;
	w5300_write(priv, W5300_S0_TX_FIFO, fifo);
	}
	w5300_write32(priv, W5300_S0_TX_WRSR, len);
	}

	static void w5300_write_macaddr(struct w5300_priv *priv)
	{
	struct net_device *ndev = priv->ndev;
	w5300_write32(priv, W5300_SHARL,
	ndev->dev_addr[0] << 24 \|
	ndev->dev_addr[1] << 16 \|
	ndev->dev_addr[2] << 8 \|
	ndev->dev_addr[3]);
	w5300_write(priv, W5300_SHARH,
	ndev->dev_addr[4] << 8 \|
	ndev->dev_addr[5]);
	mmiowb();
	}

	static void w5300_hw_reset(struct w5300_priv *priv)
	{
	w5300_write_direct(priv, W5300_MR, MR_RST);
	mmiowb();
	mdelay(5);
	w5300_write_direct(priv, W5300_MR, priv->indirect ?
	MR_WDF(7) \| MR_PB \| MR_IND :
	MR_WDF(7) \| MR_PB);
	mmiowb();
	w5300_write(priv, W5300_IMR, 0);
	w5300_write_macaddr(priv);

	/* Configure 128K of internal memory
	* as 64K RX fifo and 64K TX fifo
	*/
	w5300_write32(priv, W5300_RMSRL, 64 << 24);
	w5300_write32(priv, W5300_RMSRH, 0);
	w5300_write32(priv, W5300_TMSRL, 64 << 24);
	w5300_write32(priv, W5300_TMSRH, 0);
	w5300_write(priv, W5300_MTYPE, 0x00ff);
	mmiowb();
	}

	static void w5300_hw_start(struct w5300_priv *priv)
	{
	w5300_write(priv, W5300_S0_MR, priv->promisc ?
	S0_MR_MACRAW : S0_MR_MACRAW_MF);
	mmiowb();
	w5300_command(priv, S0_CR_OPEN);
	w5300_write(priv, W5300_S0_IMR, S0_IR_RECV \| S0_IR_SENDOK);
	w5300_write(priv, W5300_IMR, IR_S0);
	mmiowb();
	}

	static void w5300_hw_close(struct w5300_priv *priv)
	{
	w5300_write(priv, W5300_IMR, 0);
	mmiowb();
	w5300_command(priv, S0_CR_CLOSE);
	}

	/***********************************************************************
	*
	* Device driver functions / callbacks
	*
	***********************************************************************/

	static void w5300_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 w5300_get_link(struct net_device *ndev)
	{
	struct w5300_priv *priv = netdev_priv(ndev);

	if (gpio_is_valid(priv->link_gpio))
	return !!gpio_get_value(priv->link_gpio);

	return 1;
	}

	static u32 w5300_get_msglevel(struct net_device *ndev)
	{
	struct w5300_priv *priv = netdev_priv(ndev);

	return priv->msg_enable;
	}

	static void w5300_set_msglevel(struct net_device *ndev, u32 value)
	{
	struct w5300_priv *priv = netdev_priv(ndev);

	priv->msg_enable = value;
	}

	static int w5300_get_regs_len(struct net_device *ndev)
	{
	return W5300_REGS_LEN;
	}

	static void w5300_get_regs(struct net_device *ndev,
	struct ethtool_regs regs, void _buf)
	{
	struct w5300_priv *priv = netdev_priv(ndev);
	u8 *buf = _buf;
	u16 addr;
	u16 data;

	regs->version = 1;
	for (addr = 0; addr < W5300_REGS_LEN; addr += 2) {
	switch (addr & 0x23f) {
	case W5300_S0_TX_FIFO: /* cannot read TX_FIFO */
	case W5300_S0_RX_FIFO: /* cannot read RX_FIFO */
	data = 0xffff;
	break;
	default:
	data = w5300_read(priv, addr);
	break;
	}
	*buf++ = data >> 8;
	*buf++ = data;
	}
	}

	static void w5300_tx_timeout(struct net_device *ndev)
	{
	struct w5300_priv *priv = netdev_priv(ndev);

	netif_stop_queue(ndev);
	w5300_hw_reset(priv);
	w5300_hw_start(priv);
	ndev->stats.tx_errors++;
	ndev->trans_start = jiffies;
	netif_wake_queue(ndev);
	}

	static int w5300_start_tx(struct sk_buff skb, struct net_device ndev)
	{
	struct w5300_priv *priv = netdev_priv(ndev);

	netif_stop_queue(ndev);

	w5300_write_frame(priv, skb->data, skb->len);
	mmiowb();
	ndev->stats.tx_packets++;
	ndev->stats.tx_bytes += skb->len;
	dev_kfree_skb(skb);
	netif_dbg(priv, tx_queued, ndev, "tx queued\n");

	w5300_command(priv, S0_CR_SEND);

	return NETDEV_TX_OK;
	}

	static int w5300_napi_poll(struct napi_struct *napi, int budget)
	{
	struct w5300_priv *priv = container_of(napi, struct w5300_priv, napi);
	struct net_device *ndev = priv->ndev;
	struct sk_buff *skb;
	int rx_count;
	u16 rx_len;

	for (rx_count = 0; rx_count < budget; rx_count++) {
	u32 rx_fifo_len = w5300_read32(priv, W5300_S0_RX_RSR);
	if (rx_fifo_len == 0)
	break;

	rx_len = w5300_read(priv, W5300_S0_RX_FIFO);

	skb = netdev_alloc_skb_ip_align(ndev, roundup(rx_len, 2));
	if (unlikely(!skb)) {
	u32 i;
	for (i = 0; i < rx_fifo_len; i += 2)
	w5300_read(priv, W5300_S0_RX_FIFO);
	ndev->stats.rx_dropped++;
	return -ENOMEM;
	}

	skb_put(skb, rx_len);
	w5300_read_frame(priv, skb->data, rx_len);
	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) {
	w5300_write(priv, W5300_IMR, IR_S0);
	mmiowb();
	napi_complete(napi);
	}

	return rx_count;
	}

	static irqreturn_t w5300_interrupt(int irq, void *ndev_instance)
	{
	struct net_device *ndev = ndev_instance;
	struct w5300_priv *priv = netdev_priv(ndev);

	int ir = w5300_read(priv, W5300_S0_IR);
	if (!ir)
	return IRQ_NONE;
	w5300_write(priv, W5300_S0_IR, ir);
	mmiowb();

	if (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)) {
	w5300_write(priv, W5300_IMR, 0);
	mmiowb();
	__napi_schedule(&priv->napi);
	}
	}

	return IRQ_HANDLED;
	}

	static irqreturn_t w5300_detect_link(int irq, void *ndev_instance)
	{
	struct net_device *ndev = ndev_instance;
	struct w5300_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 w5300_set_rx_mode(struct net_device *ndev)
	{
	struct w5300_priv *priv = netdev_priv(ndev);
	bool set_promisc = (ndev->flags & IFF_PROMISC) != 0;

	if (priv->promisc != set_promisc) {
	priv->promisc = set_promisc;
	w5300_hw_start(priv);
	}
	}

	static int w5300_set_macaddr(struct net_device ndev, void addr)
	{
	struct w5300_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);
	w5300_write_macaddr(priv);
	return 0;
	}

	static int w5300_open(struct net_device *ndev)
	{
	struct w5300_priv *priv = netdev_priv(ndev);

	netif_info(priv, ifup, ndev, "enabling\n");
	w5300_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 w5300_stop(struct net_device *ndev)
	{
	struct w5300_priv *priv = netdev_priv(ndev);

	netif_info(priv, ifdown, ndev, "shutting down\n");
	w5300_hw_close(priv);
	netif_carrier_off(ndev);
	netif_stop_queue(ndev);
	napi_disable(&priv->napi);
	return 0;
	}

	static const struct ethtool_ops w5300_ethtool_ops = {
	.get_drvinfo = w5300_get_drvinfo,
	.get_msglevel = w5300_get_msglevel,
	.set_msglevel = w5300_set_msglevel,
	.get_link = w5300_get_link,
	.get_regs_len = w5300_get_regs_len,
	.get_regs = w5300_get_regs,
	};

	static const struct net_device_ops w5300_netdev_ops = {
	.ndo_open = w5300_open,
	.ndo_stop = w5300_stop,
	.ndo_start_xmit = w5300_start_tx,
	.ndo_tx_timeout = w5300_tx_timeout,
	.ndo_set_rx_mode = w5300_set_rx_mode,
	.ndo_set_mac_address = w5300_set_macaddr,
	.ndo_validate_addr = eth_validate_addr,
	.ndo_change_mtu = eth_change_mtu,
	};

	static int w5300_hw_probe(struct platform_device *pdev)
	{
	struct wiznet_platform_data *data = dev_get_platdata(&pdev->dev);
	struct net_device *ndev = platform_get_drvdata(pdev);
	struct w5300_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 {
	eth_hw_addr_random(ndev);
	}

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->base = devm_ioremap_resource(&pdev->dev, mem);
	if (IS_ERR(priv->base))
	return PTR_ERR(priv->base);

	mem_size = resource_size(mem);

	spin_lock_init(&priv->reg_lock);
	priv->indirect = mem_size < W5300_BUS_DIRECT_SIZE;
	if (priv->indirect) {
	priv->read = w5300_read_indirect;
	priv->write = w5300_write_indirect;
	} else {
	priv->read = w5300_read_direct;
	priv->write = w5300_write_direct;
	}

	w5300_hw_reset(priv);
	if (w5300_read(priv, W5300_IDR) != IDR_W5300)
	return -ENODEV;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
	return irq;
	ret = request_irq(irq, w5300_interrupt,
	IRQ_TYPE_LEVEL_LOW, name, ndev);
	if (ret < 0)
	return ret;
	priv->irq = irq;

	priv->link_gpio = data ? data->link_gpio : -EINVAL;
	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, w5300_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 w5300_probe(struct platform_device *pdev)
	{
	struct w5300_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;

	ndev->netdev_ops = &w5300_netdev_ops;
	ndev->ethtool_ops = &w5300_ethtool_ops;
	ndev->watchdog_timeo = HZ;
	netif_napi_add(ndev, &priv->napi, w5300_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 = w5300_hw_probe(pdev);
	if (err < 0)
	goto err_hw_probe;

	return 0;

	err_hw_probe:
	unregister_netdev(ndev);
	err_register:
	free_netdev(ndev);
	return err;
	}

	static int w5300_remove(struct platform_device *pdev)
	{
	struct net_device *ndev = platform_get_drvdata(pdev);
	struct w5300_priv *priv = netdev_priv(ndev);

	w5300_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);
	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int w5300_suspend(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct net_device *ndev = platform_get_drvdata(pdev);
	struct w5300_priv *priv = netdev_priv(ndev);

	if (netif_running(ndev)) {
	netif_carrier_off(ndev);
	netif_device_detach(ndev);

	w5300_hw_close(priv);
	}
	return 0;
	}

	static int w5300_resume(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct net_device *ndev = platform_get_drvdata(pdev);
	struct w5300_priv *priv = netdev_priv(ndev);

	if (!netif_running(ndev)) {
	w5300_hw_reset(priv);
	w5300_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_SLEEP */

	static SIMPLE_DEV_PM_OPS(w5300_pm_ops, w5300_suspend, w5300_resume);

	static struct platform_driver w5300_driver = {
	.driver = {
	.name = DRV_NAME,
	.pm = &w5300_pm_ops,
	},
	.probe = w5300_probe,
	.remove = w5300_remove,
	};

	module_platform_driver(w5300_driver);