1 /*
2  * Ethernet driver for the WIZnet W5300 chip.
3  *
4  * Copyright (C) 2008-2009 WIZnet Co.,Ltd.
5  * Copyright (C) 2011 Taehun Kim <kth3321 <at> gmail.com>
6  * Copyright (C) 2012 Mike Sinkovsky <msink@permonline.ru>
7  *
8  * Licensed under the GPL-2 or later.
9  */
10 
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/netdevice.h>
14 #include <linux/etherdevice.h>
15 #include <linux/platform_device.h>
16 #include <linux/platform_data/wiznet.h>
17 #include <linux/ethtool.h>
18 #include <linux/skbuff.h>
19 #include <linux/types.h>
20 #include <linux/errno.h>
21 #include <linux/delay.h>
22 #include <linux/slab.h>
23 #include <linux/spinlock.h>
24 #include <linux/io.h>
25 #include <linux/ioport.h>
26 #include <linux/interrupt.h>
27 #include <linux/irq.h>
28 #include <linux/gpio.h>
29 
30 #define DRV_NAME	"w5300"
31 #define DRV_VERSION	"2012-04-04"
32 
33 MODULE_DESCRIPTION("WIZnet W5300 Ethernet driver v"DRV_VERSION);
34 MODULE_AUTHOR("Mike Sinkovsky <msink@permonline.ru>");
35 MODULE_ALIAS("platform:"DRV_NAME);
36 MODULE_LICENSE("GPL");
37 
38 /*
39  * Registers
40  */
41 #define W5300_MR		0x0000	/* Mode Register */
42 #define   MR_DBW		  (1 << 15) /* Data bus width */
43 #define   MR_MPF		  (1 << 14) /* Mac layer pause frame */
44 #define   MR_WDF(n)		  (((n)&7)<<11) /* Write data fetch time */
45 #define   MR_RDH		  (1 << 10) /* Read data hold time */
46 #define   MR_FS			  (1 << 8)  /* FIFO swap */
47 #define   MR_RST		  (1 << 7)  /* S/W reset */
48 #define   MR_PB			  (1 << 4)  /* Ping block */
49 #define   MR_DBS		  (1 << 2)  /* Data bus swap */
50 #define   MR_IND		  (1 << 0)  /* Indirect mode */
51 #define W5300_IR		0x0002	/* Interrupt Register */
52 #define W5300_IMR		0x0004	/* Interrupt Mask Register */
53 #define   IR_S0			  0x0001  /* S0 interrupt */
54 #define W5300_SHARL		0x0008	/* Source MAC address (0123) */
55 #define W5300_SHARH		0x000c	/* Source MAC address (45) */
56 #define W5300_TMSRL		0x0020	/* Transmit Memory Size (0123) */
57 #define W5300_TMSRH		0x0024	/* Transmit Memory Size (4567) */
58 #define W5300_RMSRL		0x0028	/* Receive Memory Size (0123) */
59 #define W5300_RMSRH		0x002c	/* Receive Memory Size (4567) */
60 #define W5300_MTYPE		0x0030	/* Memory Type */
61 #define W5300_IDR		0x00fe	/* Chip ID register */
62 #define   IDR_W5300		  0x5300  /* =0x5300 for WIZnet W5300 */
63 #define W5300_S0_MR		0x0200	/* S0 Mode Register */
64 #define   S0_MR_CLOSED		  0x0000  /* Close mode */
65 #define   S0_MR_MACRAW		  0x0004  /* MAC RAW mode (promiscuous) */
66 #define   S0_MR_MACRAW_MF	  0x0044  /* MAC RAW mode (filtered) */
67 #define W5300_S0_CR		0x0202	/* S0 Command Register */
68 #define   S0_CR_OPEN		  0x0001  /* OPEN command */
69 #define   S0_CR_CLOSE		  0x0010  /* CLOSE command */
70 #define   S0_CR_SEND		  0x0020  /* SEND command */
71 #define   S0_CR_RECV		  0x0040  /* RECV command */
72 #define W5300_S0_IMR		0x0204	/* S0 Interrupt Mask Register */
73 #define W5300_S0_IR		0x0206	/* S0 Interrupt Register */
74 #define   S0_IR_RECV		  0x0004  /* Receive interrupt */
75 #define   S0_IR_SENDOK		  0x0010  /* Send OK interrupt */
76 #define W5300_S0_SSR		0x0208	/* S0 Socket Status Register */
77 #define W5300_S0_TX_WRSR	0x0220	/* S0 TX Write Size Register */
78 #define W5300_S0_TX_FSR		0x0224	/* S0 TX Free Size Register */
79 #define W5300_S0_RX_RSR		0x0228	/* S0 Received data Size */
80 #define W5300_S0_TX_FIFO	0x022e	/* S0 Transmit FIFO */
81 #define W5300_S0_RX_FIFO	0x0230	/* S0 Receive FIFO */
82 #define W5300_REGS_LEN		0x0400
83 
84 /*
85  * Device driver private data structure
86  */
87 struct w5300_priv {
88 	void __iomem *base;
89 	spinlock_t reg_lock;
90 	bool indirect;
91 	u16  (*read) (struct w5300_priv *priv, u16 addr);
92 	void (*write)(struct w5300_priv *priv, u16 addr, u16 data);
93 	int irq;
94 	int link_irq;
95 	int link_gpio;
96 
97 	struct napi_struct napi;
98 	struct net_device *ndev;
99 	bool promisc;
100 	u32 msg_enable;
101 };
102 
103 /************************************************************************
104  *
105  *  Lowlevel I/O functions
106  *
107  ***********************************************************************/
108 
109 /*
110  * In direct address mode host system can directly access W5300 registers
111  * after mapping to Memory-Mapped I/O space.
112  *
113  * 0x400 bytes are required for memory space.
114  */
115 static inline u16 w5300_read_direct(struct w5300_priv *priv, u16 addr)
116 {
117 	return ioread16(priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
118 }
119 
120 static inline void w5300_write_direct(struct w5300_priv *priv,
121 				      u16 addr, u16 data)
122 {
123 	iowrite16(data, priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
124 }
125 
126 /*
127  * In indirect address mode host system indirectly accesses registers by
128  * using Indirect Mode Address Register (IDM_AR) and Indirect Mode Data
129  * Register (IDM_DR), which are directly mapped to Memory-Mapped I/O space.
130  * Mode Register (MR) is directly accessible.
131  *
132  * Only 0x06 bytes are required for memory space.
133  */
134 #define W5300_IDM_AR		0x0002	 /* Indirect Mode Address */
135 #define W5300_IDM_DR		0x0004	 /* Indirect Mode Data */
136 
137 static u16 w5300_read_indirect(struct w5300_priv *priv, u16 addr)
138 {
139 	unsigned long flags;
140 	u16 data;
141 
142 	spin_lock_irqsave(&priv->reg_lock, flags);
143 	w5300_write_direct(priv, W5300_IDM_AR, addr);
144 	mmiowb();
145 	data = w5300_read_direct(priv, W5300_IDM_DR);
146 	spin_unlock_irqrestore(&priv->reg_lock, flags);
147 
148 	return data;
149 }
150 
151 static void w5300_write_indirect(struct w5300_priv *priv, u16 addr, u16 data)
152 {
153 	unsigned long flags;
154 
155 	spin_lock_irqsave(&priv->reg_lock, flags);
156 	w5300_write_direct(priv, W5300_IDM_AR, addr);
157 	mmiowb();
158 	w5300_write_direct(priv, W5300_IDM_DR, data);
159 	mmiowb();
160 	spin_unlock_irqrestore(&priv->reg_lock, flags);
161 }
162 
163 #if defined(CONFIG_WIZNET_BUS_DIRECT)
164 #define w5300_read	w5300_read_direct
165 #define w5300_write	w5300_write_direct
166 
167 #elif defined(CONFIG_WIZNET_BUS_INDIRECT)
168 #define w5300_read	w5300_read_indirect
169 #define w5300_write	w5300_write_indirect
170 
171 #else /* CONFIG_WIZNET_BUS_ANY */
172 #define w5300_read	priv->read
173 #define w5300_write	priv->write
174 #endif
175 
176 static u32 w5300_read32(struct w5300_priv *priv, u16 addr)
177 {
178 	u32 data;
179 	data  = w5300_read(priv, addr) << 16;
180 	data |= w5300_read(priv, addr + 2);
181 	return data;
182 }
183 
184 static void w5300_write32(struct w5300_priv *priv, u16 addr, u32 data)
185 {
186 	w5300_write(priv, addr, data >> 16);
187 	w5300_write(priv, addr + 2, data);
188 }
189 
190 static int w5300_command(struct w5300_priv *priv, u16 cmd)
191 {
192 	unsigned long timeout = jiffies + msecs_to_jiffies(100);
193 
194 	w5300_write(priv, W5300_S0_CR, cmd);
195 	mmiowb();
196 
197 	while (w5300_read(priv, W5300_S0_CR) != 0) {
198 		if (time_after(jiffies, timeout))
199 			return -EIO;
200 		cpu_relax();
201 	}
202 
203 	return 0;
204 }
205 
206 static void w5300_read_frame(struct w5300_priv *priv, u8 *buf, int len)
207 {
208 	u16 fifo;
209 	int i;
210 
211 	for (i = 0; i < len; i += 2) {
212 		fifo = w5300_read(priv, W5300_S0_RX_FIFO);
213 		*buf++ = fifo >> 8;
214 		*buf++ = fifo;
215 	}
216 	fifo = w5300_read(priv, W5300_S0_RX_FIFO);
217 	fifo = w5300_read(priv, W5300_S0_RX_FIFO);
218 }
219 
220 static void w5300_write_frame(struct w5300_priv *priv, u8 *buf, int len)
221 {
222 	u16 fifo;
223 	int i;
224 
225 	for (i = 0; i < len; i += 2) {
226 		fifo  = *buf++ << 8;
227 		fifo |= *buf++;
228 		w5300_write(priv, W5300_S0_TX_FIFO, fifo);
229 	}
230 	w5300_write32(priv, W5300_S0_TX_WRSR, len);
231 }
232 
233 static void w5300_write_macaddr(struct w5300_priv *priv)
234 {
235 	struct net_device *ndev = priv->ndev;
236 	w5300_write32(priv, W5300_SHARL,
237 		      ndev->dev_addr[0] << 24 |
238 		      ndev->dev_addr[1] << 16 |
239 		      ndev->dev_addr[2] << 8 |
240 		      ndev->dev_addr[3]);
241 	w5300_write(priv, W5300_SHARH,
242 		      ndev->dev_addr[4] << 8 |
243 		      ndev->dev_addr[5]);
244 	mmiowb();
245 }
246 
247 static void w5300_hw_reset(struct w5300_priv *priv)
248 {
249 	w5300_write_direct(priv, W5300_MR, MR_RST);
250 	mmiowb();
251 	mdelay(5);
252 	w5300_write_direct(priv, W5300_MR, priv->indirect ?
253 				 MR_WDF(7) | MR_PB | MR_IND :
254 				 MR_WDF(7) | MR_PB);
255 	mmiowb();
256 	w5300_write(priv, W5300_IMR, 0);
257 	w5300_write_macaddr(priv);
258 
259 	/* Configure 128K of internal memory
260 	 * as 64K RX fifo and 64K TX fifo
261 	 */
262 	w5300_write32(priv, W5300_RMSRL, 64 << 24);
263 	w5300_write32(priv, W5300_RMSRH, 0);
264 	w5300_write32(priv, W5300_TMSRL, 64 << 24);
265 	w5300_write32(priv, W5300_TMSRH, 0);
266 	w5300_write(priv, W5300_MTYPE, 0x00ff);
267 	mmiowb();
268 }
269 
270 static void w5300_hw_start(struct w5300_priv *priv)
271 {
272 	w5300_write(priv, W5300_S0_MR, priv->promisc ?
273 			  S0_MR_MACRAW : S0_MR_MACRAW_MF);
274 	mmiowb();
275 	w5300_command(priv, S0_CR_OPEN);
276 	w5300_write(priv, W5300_S0_IMR, S0_IR_RECV | S0_IR_SENDOK);
277 	w5300_write(priv, W5300_IMR, IR_S0);
278 	mmiowb();
279 }
280 
281 static void w5300_hw_close(struct w5300_priv *priv)
282 {
283 	w5300_write(priv, W5300_IMR, 0);
284 	mmiowb();
285 	w5300_command(priv, S0_CR_CLOSE);
286 }
287 
288 /***********************************************************************
289  *
290  *   Device driver functions / callbacks
291  *
292  ***********************************************************************/
293 
294 static void w5300_get_drvinfo(struct net_device *ndev,
295 			      struct ethtool_drvinfo *info)
296 {
297 	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
298 	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
299 	strlcpy(info->bus_info, dev_name(ndev->dev.parent),
300 		sizeof(info->bus_info));
301 }
302 
303 static u32 w5300_get_link(struct net_device *ndev)
304 {
305 	struct w5300_priv *priv = netdev_priv(ndev);
306 
307 	if (gpio_is_valid(priv->link_gpio))
308 		return !!gpio_get_value(priv->link_gpio);
309 
310 	return 1;
311 }
312 
313 static u32 w5300_get_msglevel(struct net_device *ndev)
314 {
315 	struct w5300_priv *priv = netdev_priv(ndev);
316 
317 	return priv->msg_enable;
318 }
319 
320 static void w5300_set_msglevel(struct net_device *ndev, u32 value)
321 {
322 	struct w5300_priv *priv = netdev_priv(ndev);
323 
324 	priv->msg_enable = value;
325 }
326 
327 static int w5300_get_regs_len(struct net_device *ndev)
328 {
329 	return W5300_REGS_LEN;
330 }
331 
332 static void w5300_get_regs(struct net_device *ndev,
333 			   struct ethtool_regs *regs, void *_buf)
334 {
335 	struct w5300_priv *priv = netdev_priv(ndev);
336 	u8 *buf = _buf;
337 	u16 addr;
338 	u16 data;
339 
340 	regs->version = 1;
341 	for (addr = 0; addr < W5300_REGS_LEN; addr += 2) {
342 		switch (addr & 0x23f) {
343 		case W5300_S0_TX_FIFO: /* cannot read TX_FIFO */
344 		case W5300_S0_RX_FIFO: /* cannot read RX_FIFO */
345 			data = 0xffff;
346 			break;
347 		default:
348 			data = w5300_read(priv, addr);
349 			break;
350 		}
351 		*buf++ = data >> 8;
352 		*buf++ = data;
353 	}
354 }
355 
356 static void w5300_tx_timeout(struct net_device *ndev)
357 {
358 	struct w5300_priv *priv = netdev_priv(ndev);
359 
360 	netif_stop_queue(ndev);
361 	w5300_hw_reset(priv);
362 	w5300_hw_start(priv);
363 	ndev->stats.tx_errors++;
364 	netif_trans_update(ndev);
365 	netif_wake_queue(ndev);
366 }
367 
368 static netdev_tx_t w5300_start_tx(struct sk_buff *skb, struct net_device *ndev)
369 {
370 	struct w5300_priv *priv = netdev_priv(ndev);
371 
372 	netif_stop_queue(ndev);
373 
374 	w5300_write_frame(priv, skb->data, skb->len);
375 	mmiowb();
376 	ndev->stats.tx_packets++;
377 	ndev->stats.tx_bytes += skb->len;
378 	dev_kfree_skb(skb);
379 	netif_dbg(priv, tx_queued, ndev, "tx queued\n");
380 
381 	w5300_command(priv, S0_CR_SEND);
382 
383 	return NETDEV_TX_OK;
384 }
385 
386 static int w5300_napi_poll(struct napi_struct *napi, int budget)
387 {
388 	struct w5300_priv *priv = container_of(napi, struct w5300_priv, napi);
389 	struct net_device *ndev = priv->ndev;
390 	struct sk_buff *skb;
391 	int rx_count;
392 	u16 rx_len;
393 
394 	for (rx_count = 0; rx_count < budget; rx_count++) {
395 		u32 rx_fifo_len = w5300_read32(priv, W5300_S0_RX_RSR);
396 		if (rx_fifo_len == 0)
397 			break;
398 
399 		rx_len = w5300_read(priv, W5300_S0_RX_FIFO);
400 
401 		skb = netdev_alloc_skb_ip_align(ndev, roundup(rx_len, 2));
402 		if (unlikely(!skb)) {
403 			u32 i;
404 			for (i = 0; i < rx_fifo_len; i += 2)
405 				w5300_read(priv, W5300_S0_RX_FIFO);
406 			ndev->stats.rx_dropped++;
407 			return -ENOMEM;
408 		}
409 
410 		skb_put(skb, rx_len);
411 		w5300_read_frame(priv, skb->data, rx_len);
412 		skb->protocol = eth_type_trans(skb, ndev);
413 
414 		netif_receive_skb(skb);
415 		ndev->stats.rx_packets++;
416 		ndev->stats.rx_bytes += rx_len;
417 	}
418 
419 	if (rx_count < budget) {
420 		napi_complete_done(napi, rx_count);
421 		w5300_write(priv, W5300_IMR, IR_S0);
422 		mmiowb();
423 	}
424 
425 	return rx_count;
426 }
427 
428 static irqreturn_t w5300_interrupt(int irq, void *ndev_instance)
429 {
430 	struct net_device *ndev = ndev_instance;
431 	struct w5300_priv *priv = netdev_priv(ndev);
432 
433 	int ir = w5300_read(priv, W5300_S0_IR);
434 	if (!ir)
435 		return IRQ_NONE;
436 	w5300_write(priv, W5300_S0_IR, ir);
437 	mmiowb();
438 
439 	if (ir & S0_IR_SENDOK) {
440 		netif_dbg(priv, tx_done, ndev, "tx done\n");
441 		netif_wake_queue(ndev);
442 	}
443 
444 	if (ir & S0_IR_RECV) {
445 		if (napi_schedule_prep(&priv->napi)) {
446 			w5300_write(priv, W5300_IMR, 0);
447 			mmiowb();
448 			__napi_schedule(&priv->napi);
449 		}
450 	}
451 
452 	return IRQ_HANDLED;
453 }
454 
455 static irqreturn_t w5300_detect_link(int irq, void *ndev_instance)
456 {
457 	struct net_device *ndev = ndev_instance;
458 	struct w5300_priv *priv = netdev_priv(ndev);
459 
460 	if (netif_running(ndev)) {
461 		if (gpio_get_value(priv->link_gpio) != 0) {
462 			netif_info(priv, link, ndev, "link is up\n");
463 			netif_carrier_on(ndev);
464 		} else {
465 			netif_info(priv, link, ndev, "link is down\n");
466 			netif_carrier_off(ndev);
467 		}
468 	}
469 
470 	return IRQ_HANDLED;
471 }
472 
473 static void w5300_set_rx_mode(struct net_device *ndev)
474 {
475 	struct w5300_priv *priv = netdev_priv(ndev);
476 	bool set_promisc = (ndev->flags & IFF_PROMISC) != 0;
477 
478 	if (priv->promisc != set_promisc) {
479 		priv->promisc = set_promisc;
480 		w5300_hw_start(priv);
481 	}
482 }
483 
484 static int w5300_set_macaddr(struct net_device *ndev, void *addr)
485 {
486 	struct w5300_priv *priv = netdev_priv(ndev);
487 	struct sockaddr *sock_addr = addr;
488 
489 	if (!is_valid_ether_addr(sock_addr->sa_data))
490 		return -EADDRNOTAVAIL;
491 	memcpy(ndev->dev_addr, sock_addr->sa_data, ETH_ALEN);
492 	w5300_write_macaddr(priv);
493 	return 0;
494 }
495 
496 static int w5300_open(struct net_device *ndev)
497 {
498 	struct w5300_priv *priv = netdev_priv(ndev);
499 
500 	netif_info(priv, ifup, ndev, "enabling\n");
501 	w5300_hw_start(priv);
502 	napi_enable(&priv->napi);
503 	netif_start_queue(ndev);
504 	if (!gpio_is_valid(priv->link_gpio) ||
505 	    gpio_get_value(priv->link_gpio) != 0)
506 		netif_carrier_on(ndev);
507 	return 0;
508 }
509 
510 static int w5300_stop(struct net_device *ndev)
511 {
512 	struct w5300_priv *priv = netdev_priv(ndev);
513 
514 	netif_info(priv, ifdown, ndev, "shutting down\n");
515 	w5300_hw_close(priv);
516 	netif_carrier_off(ndev);
517 	netif_stop_queue(ndev);
518 	napi_disable(&priv->napi);
519 	return 0;
520 }
521 
522 static const struct ethtool_ops w5300_ethtool_ops = {
523 	.get_drvinfo		= w5300_get_drvinfo,
524 	.get_msglevel		= w5300_get_msglevel,
525 	.set_msglevel		= w5300_set_msglevel,
526 	.get_link		= w5300_get_link,
527 	.get_regs_len		= w5300_get_regs_len,
528 	.get_regs		= w5300_get_regs,
529 };
530 
531 static const struct net_device_ops w5300_netdev_ops = {
532 	.ndo_open		= w5300_open,
533 	.ndo_stop		= w5300_stop,
534 	.ndo_start_xmit		= w5300_start_tx,
535 	.ndo_tx_timeout		= w5300_tx_timeout,
536 	.ndo_set_rx_mode	= w5300_set_rx_mode,
537 	.ndo_set_mac_address	= w5300_set_macaddr,
538 	.ndo_validate_addr	= eth_validate_addr,
539 };
540 
541 static int w5300_hw_probe(struct platform_device *pdev)
542 {
543 	struct wiznet_platform_data *data = dev_get_platdata(&pdev->dev);
544 	struct net_device *ndev = platform_get_drvdata(pdev);
545 	struct w5300_priv *priv = netdev_priv(ndev);
546 	const char *name = netdev_name(ndev);
547 	struct resource *mem;
548 	int mem_size;
549 	int irq;
550 	int ret;
551 
552 	if (data && is_valid_ether_addr(data->mac_addr)) {
553 		memcpy(ndev->dev_addr, data->mac_addr, ETH_ALEN);
554 	} else {
555 		eth_hw_addr_random(ndev);
556 	}
557 
558 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
559 	priv->base = devm_ioremap_resource(&pdev->dev, mem);
560 	if (IS_ERR(priv->base))
561 		return PTR_ERR(priv->base);
562 
563 	mem_size = resource_size(mem);
564 
565 	spin_lock_init(&priv->reg_lock);
566 	priv->indirect = mem_size < W5300_BUS_DIRECT_SIZE;
567 	if (priv->indirect) {
568 		priv->read  = w5300_read_indirect;
569 		priv->write = w5300_write_indirect;
570 	} else {
571 		priv->read  = w5300_read_direct;
572 		priv->write = w5300_write_direct;
573 	}
574 
575 	w5300_hw_reset(priv);
576 	if (w5300_read(priv, W5300_IDR) != IDR_W5300)
577 		return -ENODEV;
578 
579 	irq = platform_get_irq(pdev, 0);
580 	if (irq < 0)
581 		return irq;
582 	ret = request_irq(irq, w5300_interrupt,
583 			  IRQ_TYPE_LEVEL_LOW, name, ndev);
584 	if (ret < 0)
585 		return ret;
586 	priv->irq = irq;
587 
588 	priv->link_gpio = data ? data->link_gpio : -EINVAL;
589 	if (gpio_is_valid(priv->link_gpio)) {
590 		char *link_name = devm_kzalloc(&pdev->dev, 16, GFP_KERNEL);
591 		if (!link_name)
592 			return -ENOMEM;
593 		snprintf(link_name, 16, "%s-link", name);
594 		priv->link_irq = gpio_to_irq(priv->link_gpio);
595 		if (request_any_context_irq(priv->link_irq, w5300_detect_link,
596 				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
597 				link_name, priv->ndev) < 0)
598 			priv->link_gpio = -EINVAL;
599 	}
600 
601 	netdev_info(ndev, "at 0x%llx irq %d\n", (u64)mem->start, irq);
602 	return 0;
603 }
604 
605 static int w5300_probe(struct platform_device *pdev)
606 {
607 	struct w5300_priv *priv;
608 	struct net_device *ndev;
609 	int err;
610 
611 	ndev = alloc_etherdev(sizeof(*priv));
612 	if (!ndev)
613 		return -ENOMEM;
614 	SET_NETDEV_DEV(ndev, &pdev->dev);
615 	platform_set_drvdata(pdev, ndev);
616 	priv = netdev_priv(ndev);
617 	priv->ndev = ndev;
618 
619 	ndev->netdev_ops = &w5300_netdev_ops;
620 	ndev->ethtool_ops = &w5300_ethtool_ops;
621 	ndev->watchdog_timeo = HZ;
622 	netif_napi_add(ndev, &priv->napi, w5300_napi_poll, 16);
623 
624 	/* This chip doesn't support VLAN packets with normal MTU,
625 	 * so disable VLAN for this device.
626 	 */
627 	ndev->features |= NETIF_F_VLAN_CHALLENGED;
628 
629 	err = register_netdev(ndev);
630 	if (err < 0)
631 		goto err_register;
632 
633 	err = w5300_hw_probe(pdev);
634 	if (err < 0)
635 		goto err_hw_probe;
636 
637 	return 0;
638 
639 err_hw_probe:
640 	unregister_netdev(ndev);
641 err_register:
642 	free_netdev(ndev);
643 	return err;
644 }
645 
646 static int w5300_remove(struct platform_device *pdev)
647 {
648 	struct net_device *ndev = platform_get_drvdata(pdev);
649 	struct w5300_priv *priv = netdev_priv(ndev);
650 
651 	w5300_hw_reset(priv);
652 	free_irq(priv->irq, ndev);
653 	if (gpio_is_valid(priv->link_gpio))
654 		free_irq(priv->link_irq, ndev);
655 
656 	unregister_netdev(ndev);
657 	free_netdev(ndev);
658 	return 0;
659 }
660 
661 #ifdef CONFIG_PM_SLEEP
662 static int w5300_suspend(struct device *dev)
663 {
664 	struct net_device *ndev = dev_get_drvdata(dev);
665 	struct w5300_priv *priv = netdev_priv(ndev);
666 
667 	if (netif_running(ndev)) {
668 		netif_carrier_off(ndev);
669 		netif_device_detach(ndev);
670 
671 		w5300_hw_close(priv);
672 	}
673 	return 0;
674 }
675 
676 static int w5300_resume(struct device *dev)
677 {
678 	struct net_device *ndev = dev_get_drvdata(dev);
679 	struct w5300_priv *priv = netdev_priv(ndev);
680 
681 	if (!netif_running(ndev)) {
682 		w5300_hw_reset(priv);
683 		w5300_hw_start(priv);
684 
685 		netif_device_attach(ndev);
686 		if (!gpio_is_valid(priv->link_gpio) ||
687 		    gpio_get_value(priv->link_gpio) != 0)
688 			netif_carrier_on(ndev);
689 	}
690 	return 0;
691 }
692 #endif /* CONFIG_PM_SLEEP */
693 
694 static SIMPLE_DEV_PM_OPS(w5300_pm_ops, w5300_suspend, w5300_resume);
695 
696 static struct platform_driver w5300_driver = {
697 	.driver		= {
698 		.name	= DRV_NAME,
699 		.pm	= &w5300_pm_ops,
700 	},
701 	.probe		= w5300_probe,
702 	.remove		= w5300_remove,
703 };
704 
705 module_platform_driver(w5300_driver);
706