cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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w5300.c (18082B)


      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Ethernet driver for the WIZnet W5300 chip.
      4 *
      5 * Copyright (C) 2008-2009 WIZnet Co.,Ltd.
      6 * Copyright (C) 2011 Taehun Kim <kth3321 <at> gmail.com>
      7 * Copyright (C) 2012 Mike Sinkovsky <msink@permonline.ru>
      8 */
      9
     10#include <linux/kernel.h>
     11#include <linux/module.h>
     12#include <linux/netdevice.h>
     13#include <linux/etherdevice.h>
     14#include <linux/platform_device.h>
     15#include <linux/platform_data/wiznet.h>
     16#include <linux/ethtool.h>
     17#include <linux/skbuff.h>
     18#include <linux/types.h>
     19#include <linux/errno.h>
     20#include <linux/delay.h>
     21#include <linux/slab.h>
     22#include <linux/spinlock.h>
     23#include <linux/io.h>
     24#include <linux/ioport.h>
     25#include <linux/interrupt.h>
     26#include <linux/irq.h>
     27#include <linux/gpio.h>
     28
     29#define DRV_NAME	"w5300"
     30#define DRV_VERSION	"2012-04-04"
     31
     32MODULE_DESCRIPTION("WIZnet W5300 Ethernet driver v"DRV_VERSION);
     33MODULE_AUTHOR("Mike Sinkovsky <msink@permonline.ru>");
     34MODULE_ALIAS("platform:"DRV_NAME);
     35MODULE_LICENSE("GPL");
     36
     37/*
     38 * Registers
     39 */
     40#define W5300_MR		0x0000	/* Mode Register */
     41#define   MR_DBW		  (1 << 15) /* Data bus width */
     42#define   MR_MPF		  (1 << 14) /* Mac layer pause frame */
     43#define   MR_WDF(n)		  (((n)&7)<<11) /* Write data fetch time */
     44#define   MR_RDH		  (1 << 10) /* Read data hold time */
     45#define   MR_FS			  (1 << 8)  /* FIFO swap */
     46#define   MR_RST		  (1 << 7)  /* S/W reset */
     47#define   MR_PB			  (1 << 4)  /* Ping block */
     48#define   MR_DBS		  (1 << 2)  /* Data bus swap */
     49#define   MR_IND		  (1 << 0)  /* Indirect mode */
     50#define W5300_IR		0x0002	/* Interrupt Register */
     51#define W5300_IMR		0x0004	/* Interrupt Mask Register */
     52#define   IR_S0			  0x0001  /* S0 interrupt */
     53#define W5300_SHARL		0x0008	/* Source MAC address (0123) */
     54#define W5300_SHARH		0x000c	/* Source MAC address (45) */
     55#define W5300_TMSRL		0x0020	/* Transmit Memory Size (0123) */
     56#define W5300_TMSRH		0x0024	/* Transmit Memory Size (4567) */
     57#define W5300_RMSRL		0x0028	/* Receive Memory Size (0123) */
     58#define W5300_RMSRH		0x002c	/* Receive Memory Size (4567) */
     59#define W5300_MTYPE		0x0030	/* Memory Type */
     60#define W5300_IDR		0x00fe	/* Chip ID register */
     61#define   IDR_W5300		  0x5300  /* =0x5300 for WIZnet W5300 */
     62#define W5300_S0_MR		0x0200	/* S0 Mode Register */
     63#define   S0_MR_CLOSED		  0x0000  /* Close mode */
     64#define   S0_MR_MACRAW		  0x0004  /* MAC RAW mode (promiscuous) */
     65#define   S0_MR_MACRAW_MF	  0x0044  /* MAC RAW mode (filtered) */
     66#define W5300_S0_CR		0x0202	/* S0 Command Register */
     67#define   S0_CR_OPEN		  0x0001  /* OPEN command */
     68#define   S0_CR_CLOSE		  0x0010  /* CLOSE command */
     69#define   S0_CR_SEND		  0x0020  /* SEND command */
     70#define   S0_CR_RECV		  0x0040  /* RECV command */
     71#define W5300_S0_IMR		0x0204	/* S0 Interrupt Mask Register */
     72#define W5300_S0_IR		0x0206	/* S0 Interrupt Register */
     73#define   S0_IR_RECV		  0x0004  /* Receive interrupt */
     74#define   S0_IR_SENDOK		  0x0010  /* Send OK interrupt */
     75#define W5300_S0_SSR		0x0208	/* S0 Socket Status Register */
     76#define W5300_S0_TX_WRSR	0x0220	/* S0 TX Write Size Register */
     77#define W5300_S0_TX_FSR		0x0224	/* S0 TX Free Size Register */
     78#define W5300_S0_RX_RSR		0x0228	/* S0 Received data Size */
     79#define W5300_S0_TX_FIFO	0x022e	/* S0 Transmit FIFO */
     80#define W5300_S0_RX_FIFO	0x0230	/* S0 Receive FIFO */
     81#define W5300_REGS_LEN		0x0400
     82
     83/*
     84 * Device driver private data structure
     85 */
     86struct w5300_priv {
     87	void __iomem *base;
     88	spinlock_t reg_lock;
     89	bool indirect;
     90	u16  (*read) (struct w5300_priv *priv, u16 addr);
     91	void (*write)(struct w5300_priv *priv, u16 addr, u16 data);
     92	int irq;
     93	int link_irq;
     94	int link_gpio;
     95
     96	struct napi_struct napi;
     97	struct net_device *ndev;
     98	bool promisc;
     99	u32 msg_enable;
    100};
    101
    102/************************************************************************
    103 *
    104 *  Lowlevel I/O functions
    105 *
    106 ***********************************************************************/
    107
    108/*
    109 * In direct address mode host system can directly access W5300 registers
    110 * after mapping to Memory-Mapped I/O space.
    111 *
    112 * 0x400 bytes are required for memory space.
    113 */
    114static inline u16 w5300_read_direct(struct w5300_priv *priv, u16 addr)
    115{
    116	return ioread16(priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
    117}
    118
    119static inline void w5300_write_direct(struct w5300_priv *priv,
    120				      u16 addr, u16 data)
    121{
    122	iowrite16(data, priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
    123}
    124
    125/*
    126 * In indirect address mode host system indirectly accesses registers by
    127 * using Indirect Mode Address Register (IDM_AR) and Indirect Mode Data
    128 * Register (IDM_DR), which are directly mapped to Memory-Mapped I/O space.
    129 * Mode Register (MR) is directly accessible.
    130 *
    131 * Only 0x06 bytes are required for memory space.
    132 */
    133#define W5300_IDM_AR		0x0002	 /* Indirect Mode Address */
    134#define W5300_IDM_DR		0x0004	 /* Indirect Mode Data */
    135
    136static u16 w5300_read_indirect(struct w5300_priv *priv, u16 addr)
    137{
    138	unsigned long flags;
    139	u16 data;
    140
    141	spin_lock_irqsave(&priv->reg_lock, flags);
    142	w5300_write_direct(priv, W5300_IDM_AR, addr);
    143	data = w5300_read_direct(priv, W5300_IDM_DR);
    144	spin_unlock_irqrestore(&priv->reg_lock, flags);
    145
    146	return data;
    147}
    148
    149static void w5300_write_indirect(struct w5300_priv *priv, u16 addr, u16 data)
    150{
    151	unsigned long flags;
    152
    153	spin_lock_irqsave(&priv->reg_lock, flags);
    154	w5300_write_direct(priv, W5300_IDM_AR, addr);
    155	w5300_write_direct(priv, W5300_IDM_DR, data);
    156	spin_unlock_irqrestore(&priv->reg_lock, flags);
    157}
    158
    159#if defined(CONFIG_WIZNET_BUS_DIRECT)
    160#define w5300_read	w5300_read_direct
    161#define w5300_write	w5300_write_direct
    162
    163#elif defined(CONFIG_WIZNET_BUS_INDIRECT)
    164#define w5300_read	w5300_read_indirect
    165#define w5300_write	w5300_write_indirect
    166
    167#else /* CONFIG_WIZNET_BUS_ANY */
    168#define w5300_read	priv->read
    169#define w5300_write	priv->write
    170#endif
    171
    172static u32 w5300_read32(struct w5300_priv *priv, u16 addr)
    173{
    174	u32 data;
    175	data  = w5300_read(priv, addr) << 16;
    176	data |= w5300_read(priv, addr + 2);
    177	return data;
    178}
    179
    180static void w5300_write32(struct w5300_priv *priv, u16 addr, u32 data)
    181{
    182	w5300_write(priv, addr, data >> 16);
    183	w5300_write(priv, addr + 2, data);
    184}
    185
    186static int w5300_command(struct w5300_priv *priv, u16 cmd)
    187{
    188	unsigned long timeout = jiffies + msecs_to_jiffies(100);
    189
    190	w5300_write(priv, W5300_S0_CR, cmd);
    191
    192	while (w5300_read(priv, W5300_S0_CR) != 0) {
    193		if (time_after(jiffies, timeout))
    194			return -EIO;
    195		cpu_relax();
    196	}
    197
    198	return 0;
    199}
    200
    201static void w5300_read_frame(struct w5300_priv *priv, u8 *buf, int len)
    202{
    203	u16 fifo;
    204	int i;
    205
    206	for (i = 0; i < len; i += 2) {
    207		fifo = w5300_read(priv, W5300_S0_RX_FIFO);
    208		*buf++ = fifo >> 8;
    209		*buf++ = fifo;
    210	}
    211	fifo = w5300_read(priv, W5300_S0_RX_FIFO);
    212	fifo = w5300_read(priv, W5300_S0_RX_FIFO);
    213}
    214
    215static void w5300_write_frame(struct w5300_priv *priv, u8 *buf, int len)
    216{
    217	u16 fifo;
    218	int i;
    219
    220	for (i = 0; i < len; i += 2) {
    221		fifo  = *buf++ << 8;
    222		fifo |= *buf++;
    223		w5300_write(priv, W5300_S0_TX_FIFO, fifo);
    224	}
    225	w5300_write32(priv, W5300_S0_TX_WRSR, len);
    226}
    227
    228static void w5300_write_macaddr(struct w5300_priv *priv)
    229{
    230	struct net_device *ndev = priv->ndev;
    231	w5300_write32(priv, W5300_SHARL,
    232		      ndev->dev_addr[0] << 24 |
    233		      ndev->dev_addr[1] << 16 |
    234		      ndev->dev_addr[2] << 8 |
    235		      ndev->dev_addr[3]);
    236	w5300_write(priv, W5300_SHARH,
    237		      ndev->dev_addr[4] << 8 |
    238		      ndev->dev_addr[5]);
    239}
    240
    241static void w5300_hw_reset(struct w5300_priv *priv)
    242{
    243	w5300_write_direct(priv, W5300_MR, MR_RST);
    244	mdelay(5);
    245	w5300_write_direct(priv, W5300_MR, priv->indirect ?
    246				 MR_WDF(7) | MR_PB | MR_IND :
    247				 MR_WDF(7) | MR_PB);
    248	w5300_write(priv, W5300_IMR, 0);
    249	w5300_write_macaddr(priv);
    250
    251	/* Configure 128K of internal memory
    252	 * as 64K RX fifo and 64K TX fifo
    253	 */
    254	w5300_write32(priv, W5300_RMSRL, 64 << 24);
    255	w5300_write32(priv, W5300_RMSRH, 0);
    256	w5300_write32(priv, W5300_TMSRL, 64 << 24);
    257	w5300_write32(priv, W5300_TMSRH, 0);
    258	w5300_write(priv, W5300_MTYPE, 0x00ff);
    259}
    260
    261static void w5300_hw_start(struct w5300_priv *priv)
    262{
    263	w5300_write(priv, W5300_S0_MR, priv->promisc ?
    264			  S0_MR_MACRAW : S0_MR_MACRAW_MF);
    265	w5300_command(priv, S0_CR_OPEN);
    266	w5300_write(priv, W5300_S0_IMR, S0_IR_RECV | S0_IR_SENDOK);
    267	w5300_write(priv, W5300_IMR, IR_S0);
    268}
    269
    270static void w5300_hw_close(struct w5300_priv *priv)
    271{
    272	w5300_write(priv, W5300_IMR, 0);
    273	w5300_command(priv, S0_CR_CLOSE);
    274}
    275
    276/***********************************************************************
    277 *
    278 *   Device driver functions / callbacks
    279 *
    280 ***********************************************************************/
    281
    282static void w5300_get_drvinfo(struct net_device *ndev,
    283			      struct ethtool_drvinfo *info)
    284{
    285	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
    286	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
    287	strlcpy(info->bus_info, dev_name(ndev->dev.parent),
    288		sizeof(info->bus_info));
    289}
    290
    291static u32 w5300_get_link(struct net_device *ndev)
    292{
    293	struct w5300_priv *priv = netdev_priv(ndev);
    294
    295	if (gpio_is_valid(priv->link_gpio))
    296		return !!gpio_get_value(priv->link_gpio);
    297
    298	return 1;
    299}
    300
    301static u32 w5300_get_msglevel(struct net_device *ndev)
    302{
    303	struct w5300_priv *priv = netdev_priv(ndev);
    304
    305	return priv->msg_enable;
    306}
    307
    308static void w5300_set_msglevel(struct net_device *ndev, u32 value)
    309{
    310	struct w5300_priv *priv = netdev_priv(ndev);
    311
    312	priv->msg_enable = value;
    313}
    314
    315static int w5300_get_regs_len(struct net_device *ndev)
    316{
    317	return W5300_REGS_LEN;
    318}
    319
    320static void w5300_get_regs(struct net_device *ndev,
    321			   struct ethtool_regs *regs, void *_buf)
    322{
    323	struct w5300_priv *priv = netdev_priv(ndev);
    324	u8 *buf = _buf;
    325	u16 addr;
    326	u16 data;
    327
    328	regs->version = 1;
    329	for (addr = 0; addr < W5300_REGS_LEN; addr += 2) {
    330		switch (addr & 0x23f) {
    331		case W5300_S0_TX_FIFO: /* cannot read TX_FIFO */
    332		case W5300_S0_RX_FIFO: /* cannot read RX_FIFO */
    333			data = 0xffff;
    334			break;
    335		default:
    336			data = w5300_read(priv, addr);
    337			break;
    338		}
    339		*buf++ = data >> 8;
    340		*buf++ = data;
    341	}
    342}
    343
    344static void w5300_tx_timeout(struct net_device *ndev, unsigned int txqueue)
    345{
    346	struct w5300_priv *priv = netdev_priv(ndev);
    347
    348	netif_stop_queue(ndev);
    349	w5300_hw_reset(priv);
    350	w5300_hw_start(priv);
    351	ndev->stats.tx_errors++;
    352	netif_trans_update(ndev);
    353	netif_wake_queue(ndev);
    354}
    355
    356static netdev_tx_t w5300_start_tx(struct sk_buff *skb, struct net_device *ndev)
    357{
    358	struct w5300_priv *priv = netdev_priv(ndev);
    359
    360	netif_stop_queue(ndev);
    361
    362	w5300_write_frame(priv, skb->data, skb->len);
    363	ndev->stats.tx_packets++;
    364	ndev->stats.tx_bytes += skb->len;
    365	dev_kfree_skb(skb);
    366	netif_dbg(priv, tx_queued, ndev, "tx queued\n");
    367
    368	w5300_command(priv, S0_CR_SEND);
    369
    370	return NETDEV_TX_OK;
    371}
    372
    373static int w5300_napi_poll(struct napi_struct *napi, int budget)
    374{
    375	struct w5300_priv *priv = container_of(napi, struct w5300_priv, napi);
    376	struct net_device *ndev = priv->ndev;
    377	struct sk_buff *skb;
    378	int rx_count;
    379	u16 rx_len;
    380
    381	for (rx_count = 0; rx_count < budget; rx_count++) {
    382		u32 rx_fifo_len = w5300_read32(priv, W5300_S0_RX_RSR);
    383		if (rx_fifo_len == 0)
    384			break;
    385
    386		rx_len = w5300_read(priv, W5300_S0_RX_FIFO);
    387
    388		skb = netdev_alloc_skb_ip_align(ndev, roundup(rx_len, 2));
    389		if (unlikely(!skb)) {
    390			u32 i;
    391			for (i = 0; i < rx_fifo_len; i += 2)
    392				w5300_read(priv, W5300_S0_RX_FIFO);
    393			ndev->stats.rx_dropped++;
    394			return -ENOMEM;
    395		}
    396
    397		skb_put(skb, rx_len);
    398		w5300_read_frame(priv, skb->data, rx_len);
    399		skb->protocol = eth_type_trans(skb, ndev);
    400
    401		netif_receive_skb(skb);
    402		ndev->stats.rx_packets++;
    403		ndev->stats.rx_bytes += rx_len;
    404	}
    405
    406	if (rx_count < budget) {
    407		napi_complete_done(napi, rx_count);
    408		w5300_write(priv, W5300_IMR, IR_S0);
    409	}
    410
    411	return rx_count;
    412}
    413
    414static irqreturn_t w5300_interrupt(int irq, void *ndev_instance)
    415{
    416	struct net_device *ndev = ndev_instance;
    417	struct w5300_priv *priv = netdev_priv(ndev);
    418
    419	int ir = w5300_read(priv, W5300_S0_IR);
    420	if (!ir)
    421		return IRQ_NONE;
    422	w5300_write(priv, W5300_S0_IR, ir);
    423
    424	if (ir & S0_IR_SENDOK) {
    425		netif_dbg(priv, tx_done, ndev, "tx done\n");
    426		netif_wake_queue(ndev);
    427	}
    428
    429	if (ir & S0_IR_RECV) {
    430		if (napi_schedule_prep(&priv->napi)) {
    431			w5300_write(priv, W5300_IMR, 0);
    432			__napi_schedule(&priv->napi);
    433		}
    434	}
    435
    436	return IRQ_HANDLED;
    437}
    438
    439static irqreturn_t w5300_detect_link(int irq, void *ndev_instance)
    440{
    441	struct net_device *ndev = ndev_instance;
    442	struct w5300_priv *priv = netdev_priv(ndev);
    443
    444	if (netif_running(ndev)) {
    445		if (gpio_get_value(priv->link_gpio) != 0) {
    446			netif_info(priv, link, ndev, "link is up\n");
    447			netif_carrier_on(ndev);
    448		} else {
    449			netif_info(priv, link, ndev, "link is down\n");
    450			netif_carrier_off(ndev);
    451		}
    452	}
    453
    454	return IRQ_HANDLED;
    455}
    456
    457static void w5300_set_rx_mode(struct net_device *ndev)
    458{
    459	struct w5300_priv *priv = netdev_priv(ndev);
    460	bool set_promisc = (ndev->flags & IFF_PROMISC) != 0;
    461
    462	if (priv->promisc != set_promisc) {
    463		priv->promisc = set_promisc;
    464		w5300_hw_start(priv);
    465	}
    466}
    467
    468static int w5300_set_macaddr(struct net_device *ndev, void *addr)
    469{
    470	struct w5300_priv *priv = netdev_priv(ndev);
    471	struct sockaddr *sock_addr = addr;
    472
    473	if (!is_valid_ether_addr(sock_addr->sa_data))
    474		return -EADDRNOTAVAIL;
    475	eth_hw_addr_set(ndev, sock_addr->sa_data);
    476	w5300_write_macaddr(priv);
    477	return 0;
    478}
    479
    480static int w5300_open(struct net_device *ndev)
    481{
    482	struct w5300_priv *priv = netdev_priv(ndev);
    483
    484	netif_info(priv, ifup, ndev, "enabling\n");
    485	w5300_hw_start(priv);
    486	napi_enable(&priv->napi);
    487	netif_start_queue(ndev);
    488	if (!gpio_is_valid(priv->link_gpio) ||
    489	    gpio_get_value(priv->link_gpio) != 0)
    490		netif_carrier_on(ndev);
    491	return 0;
    492}
    493
    494static int w5300_stop(struct net_device *ndev)
    495{
    496	struct w5300_priv *priv = netdev_priv(ndev);
    497
    498	netif_info(priv, ifdown, ndev, "shutting down\n");
    499	w5300_hw_close(priv);
    500	netif_carrier_off(ndev);
    501	netif_stop_queue(ndev);
    502	napi_disable(&priv->napi);
    503	return 0;
    504}
    505
    506static const struct ethtool_ops w5300_ethtool_ops = {
    507	.get_drvinfo		= w5300_get_drvinfo,
    508	.get_msglevel		= w5300_get_msglevel,
    509	.set_msglevel		= w5300_set_msglevel,
    510	.get_link		= w5300_get_link,
    511	.get_regs_len		= w5300_get_regs_len,
    512	.get_regs		= w5300_get_regs,
    513};
    514
    515static const struct net_device_ops w5300_netdev_ops = {
    516	.ndo_open		= w5300_open,
    517	.ndo_stop		= w5300_stop,
    518	.ndo_start_xmit		= w5300_start_tx,
    519	.ndo_tx_timeout		= w5300_tx_timeout,
    520	.ndo_set_rx_mode	= w5300_set_rx_mode,
    521	.ndo_set_mac_address	= w5300_set_macaddr,
    522	.ndo_validate_addr	= eth_validate_addr,
    523};
    524
    525static int w5300_hw_probe(struct platform_device *pdev)
    526{
    527	struct wiznet_platform_data *data = dev_get_platdata(&pdev->dev);
    528	struct net_device *ndev = platform_get_drvdata(pdev);
    529	struct w5300_priv *priv = netdev_priv(ndev);
    530	const char *name = netdev_name(ndev);
    531	struct resource *mem;
    532	int mem_size;
    533	int irq;
    534	int ret;
    535
    536	if (data && is_valid_ether_addr(data->mac_addr)) {
    537		eth_hw_addr_set(ndev, data->mac_addr);
    538	} else {
    539		eth_hw_addr_random(ndev);
    540	}
    541
    542	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    543	priv->base = devm_ioremap_resource(&pdev->dev, mem);
    544	if (IS_ERR(priv->base))
    545		return PTR_ERR(priv->base);
    546
    547	mem_size = resource_size(mem);
    548
    549	spin_lock_init(&priv->reg_lock);
    550	priv->indirect = mem_size < W5300_BUS_DIRECT_SIZE;
    551	if (priv->indirect) {
    552		priv->read  = w5300_read_indirect;
    553		priv->write = w5300_write_indirect;
    554	} else {
    555		priv->read  = w5300_read_direct;
    556		priv->write = w5300_write_direct;
    557	}
    558
    559	w5300_hw_reset(priv);
    560	if (w5300_read(priv, W5300_IDR) != IDR_W5300)
    561		return -ENODEV;
    562
    563	irq = platform_get_irq(pdev, 0);
    564	if (irq < 0)
    565		return irq;
    566	ret = request_irq(irq, w5300_interrupt,
    567			  IRQ_TYPE_LEVEL_LOW, name, ndev);
    568	if (ret < 0)
    569		return ret;
    570	priv->irq = irq;
    571
    572	priv->link_gpio = data ? data->link_gpio : -EINVAL;
    573	if (gpio_is_valid(priv->link_gpio)) {
    574		char *link_name = devm_kzalloc(&pdev->dev, 16, GFP_KERNEL);
    575		if (!link_name)
    576			return -ENOMEM;
    577		snprintf(link_name, 16, "%s-link", name);
    578		priv->link_irq = gpio_to_irq(priv->link_gpio);
    579		if (request_any_context_irq(priv->link_irq, w5300_detect_link,
    580				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
    581				link_name, priv->ndev) < 0)
    582			priv->link_gpio = -EINVAL;
    583	}
    584
    585	netdev_info(ndev, "at 0x%llx irq %d\n", (u64)mem->start, irq);
    586	return 0;
    587}
    588
    589static int w5300_probe(struct platform_device *pdev)
    590{
    591	struct w5300_priv *priv;
    592	struct net_device *ndev;
    593	int err;
    594
    595	ndev = alloc_etherdev(sizeof(*priv));
    596	if (!ndev)
    597		return -ENOMEM;
    598	SET_NETDEV_DEV(ndev, &pdev->dev);
    599	platform_set_drvdata(pdev, ndev);
    600	priv = netdev_priv(ndev);
    601	priv->ndev = ndev;
    602
    603	ndev->netdev_ops = &w5300_netdev_ops;
    604	ndev->ethtool_ops = &w5300_ethtool_ops;
    605	ndev->watchdog_timeo = HZ;
    606	netif_napi_add_weight(ndev, &priv->napi, w5300_napi_poll, 16);
    607
    608	/* This chip doesn't support VLAN packets with normal MTU,
    609	 * so disable VLAN for this device.
    610	 */
    611	ndev->features |= NETIF_F_VLAN_CHALLENGED;
    612
    613	err = register_netdev(ndev);
    614	if (err < 0)
    615		goto err_register;
    616
    617	err = w5300_hw_probe(pdev);
    618	if (err < 0)
    619		goto err_hw_probe;
    620
    621	return 0;
    622
    623err_hw_probe:
    624	unregister_netdev(ndev);
    625err_register:
    626	free_netdev(ndev);
    627	return err;
    628}
    629
    630static int w5300_remove(struct platform_device *pdev)
    631{
    632	struct net_device *ndev = platform_get_drvdata(pdev);
    633	struct w5300_priv *priv = netdev_priv(ndev);
    634
    635	w5300_hw_reset(priv);
    636	free_irq(priv->irq, ndev);
    637	if (gpio_is_valid(priv->link_gpio))
    638		free_irq(priv->link_irq, ndev);
    639
    640	unregister_netdev(ndev);
    641	free_netdev(ndev);
    642	return 0;
    643}
    644
    645#ifdef CONFIG_PM_SLEEP
    646static int w5300_suspend(struct device *dev)
    647{
    648	struct net_device *ndev = dev_get_drvdata(dev);
    649	struct w5300_priv *priv = netdev_priv(ndev);
    650
    651	if (netif_running(ndev)) {
    652		netif_carrier_off(ndev);
    653		netif_device_detach(ndev);
    654
    655		w5300_hw_close(priv);
    656	}
    657	return 0;
    658}
    659
    660static int w5300_resume(struct device *dev)
    661{
    662	struct net_device *ndev = dev_get_drvdata(dev);
    663	struct w5300_priv *priv = netdev_priv(ndev);
    664
    665	if (!netif_running(ndev)) {
    666		w5300_hw_reset(priv);
    667		w5300_hw_start(priv);
    668
    669		netif_device_attach(ndev);
    670		if (!gpio_is_valid(priv->link_gpio) ||
    671		    gpio_get_value(priv->link_gpio) != 0)
    672			netif_carrier_on(ndev);
    673	}
    674	return 0;
    675}
    676#endif /* CONFIG_PM_SLEEP */
    677
    678static SIMPLE_DEV_PM_OPS(w5300_pm_ops, w5300_suspend, w5300_resume);
    679
    680static struct platform_driver w5300_driver = {
    681	.driver		= {
    682		.name	= DRV_NAME,
    683		.pm	= &w5300_pm_ops,
    684	},
    685	.probe		= w5300_probe,
    686	.remove		= w5300_remove,
    687};
    688
    689module_platform_driver(w5300_driver);