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/kconfig.h>
14 #include <linux/netdevice.h>
15 #include <linux/etherdevice.h>
16 #include <linux/platform_device.h>
17 #include <linux/platform_data/wiznet.h>
18 #include <linux/ethtool.h>
19 #include <linux/skbuff.h>
20 #include <linux/types.h>
21 #include <linux/errno.h>
22 #include <linux/delay.h>
23 #include <linux/slab.h>
24 #include <linux/spinlock.h>
25 #include <linux/io.h>
26 #include <linux/ioport.h>
27 #include <linux/interrupt.h>
28 #include <linux/irq.h>
29 #include <linux/gpio.h>
30 
31 #define DRV_NAME	"w5300"
32 #define DRV_VERSION	"2012-04-04"
33 
34 MODULE_DESCRIPTION("WIZnet W5300 Ethernet driver v"DRV_VERSION);
35 MODULE_AUTHOR("Mike Sinkovsky <msink@permonline.ru>");
36 MODULE_ALIAS("platform:"DRV_NAME);
37 MODULE_LICENSE("GPL");
38 
39 /*
40  * Registers
41  */
42 #define W5300_MR		0x0000	/* Mode Register */
43 #define   MR_DBW		  (1 << 15) /* Data bus width */
44 #define   MR_MPF		  (1 << 14) /* Mac layer pause frame */
45 #define   MR_WDF(n)		  (((n)&7)<<11) /* Write data fetch time */
46 #define   MR_RDH		  (1 << 10) /* Read data hold time */
47 #define   MR_FS			  (1 << 8)  /* FIFO swap */
48 #define   MR_RST		  (1 << 7)  /* S/W reset */
49 #define   MR_PB			  (1 << 4)  /* Ping block */
50 #define   MR_DBS		  (1 << 2)  /* Data bus swap */
51 #define   MR_IND		  (1 << 0)  /* Indirect mode */
52 #define W5300_IR		0x0002	/* Interrupt Register */
53 #define W5300_IMR		0x0004	/* Interrupt Mask Register */
54 #define   IR_S0			  0x0001  /* S0 interrupt */
55 #define W5300_SHARL		0x0008	/* Source MAC address (0123) */
56 #define W5300_SHARH		0x000c	/* Source MAC address (45) */
57 #define W5300_TMSRL		0x0020	/* Transmit Memory Size (0123) */
58 #define W5300_TMSRH		0x0024	/* Transmit Memory Size (4567) */
59 #define W5300_RMSRL		0x0028	/* Receive Memory Size (0123) */
60 #define W5300_RMSRH		0x002c	/* Receive Memory Size (4567) */
61 #define W5300_MTYPE		0x0030	/* Memory Type */
62 #define W5300_IDR		0x00fe	/* Chip ID register */
63 #define   IDR_W5300		  0x5300  /* =0x5300 for WIZnet W5300 */
64 #define W5300_S0_MR		0x0200	/* S0 Mode Register */
65 #define   S0_MR_CLOSED		  0x0000  /* Close mode */
66 #define   S0_MR_MACRAW		  0x0004  /* MAC RAW mode (promiscuous) */
67 #define   S0_MR_MACRAW_MF	  0x0044  /* MAC RAW mode (filtered) */
68 #define W5300_S0_CR		0x0202	/* S0 Command Register */
69 #define   S0_CR_OPEN		  0x0001  /* OPEN command */
70 #define   S0_CR_CLOSE		  0x0010  /* CLOSE command */
71 #define   S0_CR_SEND		  0x0020  /* SEND command */
72 #define   S0_CR_RECV		  0x0040  /* RECV command */
73 #define W5300_S0_IMR		0x0204	/* S0 Interrupt Mask Register */
74 #define W5300_S0_IR		0x0206	/* S0 Interrupt Register */
75 #define   S0_IR_RECV		  0x0004  /* Receive interrupt */
76 #define   S0_IR_SENDOK		  0x0010  /* Send OK interrupt */
77 #define W5300_S0_SSR		0x0208	/* S0 Socket Status Register */
78 #define W5300_S0_TX_WRSR	0x0220	/* S0 TX Write Size Register */
79 #define W5300_S0_TX_FSR		0x0224	/* S0 TX Free Size Register */
80 #define W5300_S0_RX_RSR		0x0228	/* S0 Received data Size */
81 #define W5300_S0_TX_FIFO	0x022e	/* S0 Transmit FIFO */
82 #define W5300_S0_RX_FIFO	0x0230	/* S0 Receive FIFO */
83 #define W5300_REGS_LEN		0x0400
84 
85 /*
86  * Device driver private data structure
87  */
88 struct w5300_priv {
89 	void __iomem *base;
90 	spinlock_t reg_lock;
91 	bool indirect;
92 	u16  (*read) (struct w5300_priv *priv, u16 addr);
93 	void (*write)(struct w5300_priv *priv, u16 addr, u16 data);
94 	int irq;
95 	int link_irq;
96 	int link_gpio;
97 
98 	struct napi_struct napi;
99 	struct net_device *ndev;
100 	bool promisc;
101 	u32 msg_enable;
102 };
103 
104 /************************************************************************
105  *
106  *  Lowlevel I/O functions
107  *
108  ***********************************************************************/
109 
110 /*
111  * In direct address mode host system can directly access W5300 registers
112  * after mapping to Memory-Mapped I/O space.
113  *
114  * 0x400 bytes are required for memory space.
115  */
116 static inline u16 w5300_read_direct(struct w5300_priv *priv, u16 addr)
117 {
118 	return ioread16(priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
119 }
120 
121 static inline void w5300_write_direct(struct w5300_priv *priv,
122 				      u16 addr, u16 data)
123 {
124 	iowrite16(data, priv->base + (addr << CONFIG_WIZNET_BUS_SHIFT));
125 }
126 
127 /*
128  * In indirect address mode host system indirectly accesses registers by
129  * using Indirect Mode Address Register (IDM_AR) and Indirect Mode Data
130  * Register (IDM_DR), which are directly mapped to Memory-Mapped I/O space.
131  * Mode Register (MR) is directly accessible.
132  *
133  * Only 0x06 bytes are required for memory space.
134  */
135 #define W5300_IDM_AR		0x0002	 /* Indirect Mode Address */
136 #define W5300_IDM_DR		0x0004	 /* Indirect Mode Data */
137 
138 static u16 w5300_read_indirect(struct w5300_priv *priv, u16 addr)
139 {
140 	unsigned long flags;
141 	u16 data;
142 
143 	spin_lock_irqsave(&priv->reg_lock, flags);
144 	w5300_write_direct(priv, W5300_IDM_AR, addr);
145 	mmiowb();
146 	data = w5300_read_direct(priv, W5300_IDM_DR);
147 	spin_unlock_irqrestore(&priv->reg_lock, flags);
148 
149 	return data;
150 }
151 
152 static void w5300_write_indirect(struct w5300_priv *priv, u16 addr, u16 data)
153 {
154 	unsigned long flags;
155 
156 	spin_lock_irqsave(&priv->reg_lock, flags);
157 	w5300_write_direct(priv, W5300_IDM_AR, addr);
158 	mmiowb();
159 	w5300_write_direct(priv, W5300_IDM_DR, data);
160 	mmiowb();
161 	spin_unlock_irqrestore(&priv->reg_lock, flags);
162 }
163 
164 #if defined(CONFIG_WIZNET_BUS_DIRECT)
165 #define w5300_read	w5300_read_direct
166 #define w5300_write	w5300_write_direct
167 
168 #elif defined(CONFIG_WIZNET_BUS_INDIRECT)
169 #define w5300_read	w5300_read_indirect
170 #define w5300_write	w5300_write_indirect
171 
172 #else /* CONFIG_WIZNET_BUS_ANY */
173 #define w5300_read	priv->read
174 #define w5300_write	priv->write
175 #endif
176 
177 static u32 w5300_read32(struct w5300_priv *priv, u16 addr)
178 {
179 	u32 data;
180 	data  = w5300_read(priv, addr) << 16;
181 	data |= w5300_read(priv, addr + 2);
182 	return data;
183 }
184 
185 static void w5300_write32(struct w5300_priv *priv, u16 addr, u32 data)
186 {
187 	w5300_write(priv, addr, data >> 16);
188 	w5300_write(priv, addr + 2, data);
189 }
190 
191 static int w5300_command(struct w5300_priv *priv, u16 cmd)
192 {
193 	unsigned long timeout = jiffies + msecs_to_jiffies(100);
194 
195 	w5300_write(priv, W5300_S0_CR, cmd);
196 	mmiowb();
197 
198 	while (w5300_read(priv, W5300_S0_CR) != 0) {
199 		if (time_after(jiffies, timeout))
200 			return -EIO;
201 		cpu_relax();
202 	}
203 
204 	return 0;
205 }
206 
207 static void w5300_read_frame(struct w5300_priv *priv, u8 *buf, int len)
208 {
209 	u16 fifo;
210 	int i;
211 
212 	for (i = 0; i < len; i += 2) {
213 		fifo = w5300_read(priv, W5300_S0_RX_FIFO);
214 		*buf++ = fifo >> 8;
215 		*buf++ = fifo;
216 	}
217 	fifo = w5300_read(priv, W5300_S0_RX_FIFO);
218 	fifo = w5300_read(priv, W5300_S0_RX_FIFO);
219 }
220 
221 static void w5300_write_frame(struct w5300_priv *priv, u8 *buf, int len)
222 {
223 	u16 fifo;
224 	int i;
225 
226 	for (i = 0; i < len; i += 2) {
227 		fifo  = *buf++ << 8;
228 		fifo |= *buf++;
229 		w5300_write(priv, W5300_S0_TX_FIFO, fifo);
230 	}
231 	w5300_write32(priv, W5300_S0_TX_WRSR, len);
232 }
233 
234 static void w5300_write_macaddr(struct w5300_priv *priv)
235 {
236 	struct net_device *ndev = priv->ndev;
237 	w5300_write32(priv, W5300_SHARL,
238 		      ndev->dev_addr[0] << 24 |
239 		      ndev->dev_addr[1] << 16 |
240 		      ndev->dev_addr[2] << 8 |
241 		      ndev->dev_addr[3]);
242 	w5300_write(priv, W5300_SHARH,
243 		      ndev->dev_addr[4] << 8 |
244 		      ndev->dev_addr[5]);
245 	mmiowb();
246 }
247 
248 static void w5300_hw_reset(struct w5300_priv *priv)
249 {
250 	w5300_write_direct(priv, W5300_MR, MR_RST);
251 	mmiowb();
252 	mdelay(5);
253 	w5300_write_direct(priv, W5300_MR, priv->indirect ?
254 				 MR_WDF(7) | MR_PB | MR_IND :
255 				 MR_WDF(7) | MR_PB);
256 	mmiowb();
257 	w5300_write(priv, W5300_IMR, 0);
258 	w5300_write_macaddr(priv);
259 
260 	/* Configure 128K of internal memory
261 	 * as 64K RX fifo and 64K TX fifo
262 	 */
263 	w5300_write32(priv, W5300_RMSRL, 64 << 24);
264 	w5300_write32(priv, W5300_RMSRH, 0);
265 	w5300_write32(priv, W5300_TMSRL, 64 << 24);
266 	w5300_write32(priv, W5300_TMSRH, 0);
267 	w5300_write(priv, W5300_MTYPE, 0x00ff);
268 	mmiowb();
269 }
270 
271 static void w5300_hw_start(struct w5300_priv *priv)
272 {
273 	w5300_write(priv, W5300_S0_MR, priv->promisc ?
274 			  S0_MR_MACRAW : S0_MR_MACRAW_MF);
275 	mmiowb();
276 	w5300_command(priv, S0_CR_OPEN);
277 	w5300_write(priv, W5300_S0_IMR, S0_IR_RECV | S0_IR_SENDOK);
278 	w5300_write(priv, W5300_IMR, IR_S0);
279 	mmiowb();
280 }
281 
282 static void w5300_hw_close(struct w5300_priv *priv)
283 {
284 	w5300_write(priv, W5300_IMR, 0);
285 	mmiowb();
286 	w5300_command(priv, S0_CR_CLOSE);
287 }
288 
289 /***********************************************************************
290  *
291  *   Device driver functions / callbacks
292  *
293  ***********************************************************************/
294 
295 static void w5300_get_drvinfo(struct net_device *ndev,
296 			      struct ethtool_drvinfo *info)
297 {
298 	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
299 	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
300 	strlcpy(info->bus_info, dev_name(ndev->dev.parent),
301 		sizeof(info->bus_info));
302 }
303 
304 static u32 w5300_get_link(struct net_device *ndev)
305 {
306 	struct w5300_priv *priv = netdev_priv(ndev);
307 
308 	if (gpio_is_valid(priv->link_gpio))
309 		return !!gpio_get_value(priv->link_gpio);
310 
311 	return 1;
312 }
313 
314 static u32 w5300_get_msglevel(struct net_device *ndev)
315 {
316 	struct w5300_priv *priv = netdev_priv(ndev);
317 
318 	return priv->msg_enable;
319 }
320 
321 static void w5300_set_msglevel(struct net_device *ndev, u32 value)
322 {
323 	struct w5300_priv *priv = netdev_priv(ndev);
324 
325 	priv->msg_enable = value;
326 }
327 
328 static int w5300_get_regs_len(struct net_device *ndev)
329 {
330 	return W5300_REGS_LEN;
331 }
332 
333 static void w5300_get_regs(struct net_device *ndev,
334 			   struct ethtool_regs *regs, void *_buf)
335 {
336 	struct w5300_priv *priv = netdev_priv(ndev);
337 	u8 *buf = _buf;
338 	u16 addr;
339 	u16 data;
340 
341 	regs->version = 1;
342 	for (addr = 0; addr < W5300_REGS_LEN; addr += 2) {
343 		switch (addr & 0x23f) {
344 		case W5300_S0_TX_FIFO: /* cannot read TX_FIFO */
345 		case W5300_S0_RX_FIFO: /* cannot read RX_FIFO */
346 			data = 0xffff;
347 			break;
348 		default:
349 			data = w5300_read(priv, addr);
350 			break;
351 		}
352 		*buf++ = data >> 8;
353 		*buf++ = data;
354 	}
355 }
356 
357 static void w5300_tx_timeout(struct net_device *ndev)
358 {
359 	struct w5300_priv *priv = netdev_priv(ndev);
360 
361 	netif_stop_queue(ndev);
362 	w5300_hw_reset(priv);
363 	w5300_hw_start(priv);
364 	ndev->stats.tx_errors++;
365 	netif_trans_update(ndev);
366 	netif_wake_queue(ndev);
367 }
368 
369 static int w5300_start_tx(struct sk_buff *skb, struct net_device *ndev)
370 {
371 	struct w5300_priv *priv = netdev_priv(ndev);
372 
373 	netif_stop_queue(ndev);
374 
375 	w5300_write_frame(priv, skb->data, skb->len);
376 	mmiowb();
377 	ndev->stats.tx_packets++;
378 	ndev->stats.tx_bytes += skb->len;
379 	dev_kfree_skb(skb);
380 	netif_dbg(priv, tx_queued, ndev, "tx queued\n");
381 
382 	w5300_command(priv, S0_CR_SEND);
383 
384 	return NETDEV_TX_OK;
385 }
386 
387 static int w5300_napi_poll(struct napi_struct *napi, int budget)
388 {
389 	struct w5300_priv *priv = container_of(napi, struct w5300_priv, napi);
390 	struct net_device *ndev = priv->ndev;
391 	struct sk_buff *skb;
392 	int rx_count;
393 	u16 rx_len;
394 
395 	for (rx_count = 0; rx_count < budget; rx_count++) {
396 		u32 rx_fifo_len = w5300_read32(priv, W5300_S0_RX_RSR);
397 		if (rx_fifo_len == 0)
398 			break;
399 
400 		rx_len = w5300_read(priv, W5300_S0_RX_FIFO);
401 
402 		skb = netdev_alloc_skb_ip_align(ndev, roundup(rx_len, 2));
403 		if (unlikely(!skb)) {
404 			u32 i;
405 			for (i = 0; i < rx_fifo_len; i += 2)
406 				w5300_read(priv, W5300_S0_RX_FIFO);
407 			ndev->stats.rx_dropped++;
408 			return -ENOMEM;
409 		}
410 
411 		skb_put(skb, rx_len);
412 		w5300_read_frame(priv, skb->data, rx_len);
413 		skb->protocol = eth_type_trans(skb, ndev);
414 
415 		netif_receive_skb(skb);
416 		ndev->stats.rx_packets++;
417 		ndev->stats.rx_bytes += rx_len;
418 	}
419 
420 	if (rx_count < budget) {
421 		napi_complete(napi);
422 		w5300_write(priv, W5300_IMR, IR_S0);
423 		mmiowb();
424 	}
425 
426 	return rx_count;
427 }
428 
429 static irqreturn_t w5300_interrupt(int irq, void *ndev_instance)
430 {
431 	struct net_device *ndev = ndev_instance;
432 	struct w5300_priv *priv = netdev_priv(ndev);
433 
434 	int ir = w5300_read(priv, W5300_S0_IR);
435 	if (!ir)
436 		return IRQ_NONE;
437 	w5300_write(priv, W5300_S0_IR, ir);
438 	mmiowb();
439 
440 	if (ir & S0_IR_SENDOK) {
441 		netif_dbg(priv, tx_done, ndev, "tx done\n");
442 		netif_wake_queue(ndev);
443 	}
444 
445 	if (ir & S0_IR_RECV) {
446 		if (napi_schedule_prep(&priv->napi)) {
447 			w5300_write(priv, W5300_IMR, 0);
448 			mmiowb();
449 			__napi_schedule(&priv->napi);
450 		}
451 	}
452 
453 	return IRQ_HANDLED;
454 }
455 
456 static irqreturn_t w5300_detect_link(int irq, void *ndev_instance)
457 {
458 	struct net_device *ndev = ndev_instance;
459 	struct w5300_priv *priv = netdev_priv(ndev);
460 
461 	if (netif_running(ndev)) {
462 		if (gpio_get_value(priv->link_gpio) != 0) {
463 			netif_info(priv, link, ndev, "link is up\n");
464 			netif_carrier_on(ndev);
465 		} else {
466 			netif_info(priv, link, ndev, "link is down\n");
467 			netif_carrier_off(ndev);
468 		}
469 	}
470 
471 	return IRQ_HANDLED;
472 }
473 
474 static void w5300_set_rx_mode(struct net_device *ndev)
475 {
476 	struct w5300_priv *priv = netdev_priv(ndev);
477 	bool set_promisc = (ndev->flags & IFF_PROMISC) != 0;
478 
479 	if (priv->promisc != set_promisc) {
480 		priv->promisc = set_promisc;
481 		w5300_hw_start(priv);
482 	}
483 }
484 
485 static int w5300_set_macaddr(struct net_device *ndev, void *addr)
486 {
487 	struct w5300_priv *priv = netdev_priv(ndev);
488 	struct sockaddr *sock_addr = addr;
489 
490 	if (!is_valid_ether_addr(sock_addr->sa_data))
491 		return -EADDRNOTAVAIL;
492 	memcpy(ndev->dev_addr, sock_addr->sa_data, ETH_ALEN);
493 	w5300_write_macaddr(priv);
494 	return 0;
495 }
496 
497 static int w5300_open(struct net_device *ndev)
498 {
499 	struct w5300_priv *priv = netdev_priv(ndev);
500 
501 	netif_info(priv, ifup, ndev, "enabling\n");
502 	w5300_hw_start(priv);
503 	napi_enable(&priv->napi);
504 	netif_start_queue(ndev);
505 	if (!gpio_is_valid(priv->link_gpio) ||
506 	    gpio_get_value(priv->link_gpio) != 0)
507 		netif_carrier_on(ndev);
508 	return 0;
509 }
510 
511 static int w5300_stop(struct net_device *ndev)
512 {
513 	struct w5300_priv *priv = netdev_priv(ndev);
514 
515 	netif_info(priv, ifdown, ndev, "shutting down\n");
516 	w5300_hw_close(priv);
517 	netif_carrier_off(ndev);
518 	netif_stop_queue(ndev);
519 	napi_disable(&priv->napi);
520 	return 0;
521 }
522 
523 static const struct ethtool_ops w5300_ethtool_ops = {
524 	.get_drvinfo		= w5300_get_drvinfo,
525 	.get_msglevel		= w5300_get_msglevel,
526 	.set_msglevel		= w5300_set_msglevel,
527 	.get_link		= w5300_get_link,
528 	.get_regs_len		= w5300_get_regs_len,
529 	.get_regs		= w5300_get_regs,
530 };
531 
532 static const struct net_device_ops w5300_netdev_ops = {
533 	.ndo_open		= w5300_open,
534 	.ndo_stop		= w5300_stop,
535 	.ndo_start_xmit		= w5300_start_tx,
536 	.ndo_tx_timeout		= w5300_tx_timeout,
537 	.ndo_set_rx_mode	= w5300_set_rx_mode,
538 	.ndo_set_mac_address	= w5300_set_macaddr,
539 	.ndo_validate_addr	= eth_validate_addr,
540 	.ndo_change_mtu		= eth_change_mtu,
541 };
542 
543 static int w5300_hw_probe(struct platform_device *pdev)
544 {
545 	struct wiznet_platform_data *data = dev_get_platdata(&pdev->dev);
546 	struct net_device *ndev = platform_get_drvdata(pdev);
547 	struct w5300_priv *priv = netdev_priv(ndev);
548 	const char *name = netdev_name(ndev);
549 	struct resource *mem;
550 	int mem_size;
551 	int irq;
552 	int ret;
553 
554 	if (data && is_valid_ether_addr(data->mac_addr)) {
555 		memcpy(ndev->dev_addr, data->mac_addr, ETH_ALEN);
556 	} else {
557 		eth_hw_addr_random(ndev);
558 	}
559 
560 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
561 	priv->base = devm_ioremap_resource(&pdev->dev, mem);
562 	if (IS_ERR(priv->base))
563 		return PTR_ERR(priv->base);
564 
565 	mem_size = resource_size(mem);
566 
567 	spin_lock_init(&priv->reg_lock);
568 	priv->indirect = mem_size < W5300_BUS_DIRECT_SIZE;
569 	if (priv->indirect) {
570 		priv->read  = w5300_read_indirect;
571 		priv->write = w5300_write_indirect;
572 	} else {
573 		priv->read  = w5300_read_direct;
574 		priv->write = w5300_write_direct;
575 	}
576 
577 	w5300_hw_reset(priv);
578 	if (w5300_read(priv, W5300_IDR) != IDR_W5300)
579 		return -ENODEV;
580 
581 	irq = platform_get_irq(pdev, 0);
582 	if (irq < 0)
583 		return irq;
584 	ret = request_irq(irq, w5300_interrupt,
585 			  IRQ_TYPE_LEVEL_LOW, name, ndev);
586 	if (ret < 0)
587 		return ret;
588 	priv->irq = irq;
589 
590 	priv->link_gpio = data ? data->link_gpio : -EINVAL;
591 	if (gpio_is_valid(priv->link_gpio)) {
592 		char *link_name = devm_kzalloc(&pdev->dev, 16, GFP_KERNEL);
593 		if (!link_name)
594 			return -ENOMEM;
595 		snprintf(link_name, 16, "%s-link", name);
596 		priv->link_irq = gpio_to_irq(priv->link_gpio);
597 		if (request_any_context_irq(priv->link_irq, w5300_detect_link,
598 				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
599 				link_name, priv->ndev) < 0)
600 			priv->link_gpio = -EINVAL;
601 	}
602 
603 	netdev_info(ndev, "at 0x%llx irq %d\n", (u64)mem->start, irq);
604 	return 0;
605 }
606 
607 static int w5300_probe(struct platform_device *pdev)
608 {
609 	struct w5300_priv *priv;
610 	struct net_device *ndev;
611 	int err;
612 
613 	ndev = alloc_etherdev(sizeof(*priv));
614 	if (!ndev)
615 		return -ENOMEM;
616 	SET_NETDEV_DEV(ndev, &pdev->dev);
617 	platform_set_drvdata(pdev, ndev);
618 	priv = netdev_priv(ndev);
619 	priv->ndev = ndev;
620 
621 	ndev->netdev_ops = &w5300_netdev_ops;
622 	ndev->ethtool_ops = &w5300_ethtool_ops;
623 	ndev->watchdog_timeo = HZ;
624 	netif_napi_add(ndev, &priv->napi, w5300_napi_poll, 16);
625 
626 	/* This chip doesn't support VLAN packets with normal MTU,
627 	 * so disable VLAN for this device.
628 	 */
629 	ndev->features |= NETIF_F_VLAN_CHALLENGED;
630 
631 	err = register_netdev(ndev);
632 	if (err < 0)
633 		goto err_register;
634 
635 	err = w5300_hw_probe(pdev);
636 	if (err < 0)
637 		goto err_hw_probe;
638 
639 	return 0;
640 
641 err_hw_probe:
642 	unregister_netdev(ndev);
643 err_register:
644 	free_netdev(ndev);
645 	return err;
646 }
647 
648 static int w5300_remove(struct platform_device *pdev)
649 {
650 	struct net_device *ndev = platform_get_drvdata(pdev);
651 	struct w5300_priv *priv = netdev_priv(ndev);
652 
653 	w5300_hw_reset(priv);
654 	free_irq(priv->irq, ndev);
655 	if (gpio_is_valid(priv->link_gpio))
656 		free_irq(priv->link_irq, ndev);
657 
658 	unregister_netdev(ndev);
659 	free_netdev(ndev);
660 	return 0;
661 }
662 
663 #ifdef CONFIG_PM_SLEEP
664 static int w5300_suspend(struct device *dev)
665 {
666 	struct platform_device *pdev = to_platform_device(dev);
667 	struct net_device *ndev = platform_get_drvdata(pdev);
668 	struct w5300_priv *priv = netdev_priv(ndev);
669 
670 	if (netif_running(ndev)) {
671 		netif_carrier_off(ndev);
672 		netif_device_detach(ndev);
673 
674 		w5300_hw_close(priv);
675 	}
676 	return 0;
677 }
678 
679 static int w5300_resume(struct device *dev)
680 {
681 	struct platform_device *pdev = to_platform_device(dev);
682 	struct net_device *ndev = platform_get_drvdata(pdev);
683 	struct w5300_priv *priv = netdev_priv(ndev);
684 
685 	if (!netif_running(ndev)) {
686 		w5300_hw_reset(priv);
687 		w5300_hw_start(priv);
688 
689 		netif_device_attach(ndev);
690 		if (!gpio_is_valid(priv->link_gpio) ||
691 		    gpio_get_value(priv->link_gpio) != 0)
692 			netif_carrier_on(ndev);
693 	}
694 	return 0;
695 }
696 #endif /* CONFIG_PM_SLEEP */
697 
698 static SIMPLE_DEV_PM_OPS(w5300_pm_ops, w5300_suspend, w5300_resume);
699 
700 static struct platform_driver w5300_driver = {
701 	.driver		= {
702 		.name	= DRV_NAME,
703 		.pm	= &w5300_pm_ops,
704 	},
705 	.probe		= w5300_probe,
706 	.remove		= w5300_remove,
707 };
708 
709 module_platform_driver(w5300_driver);
710