Free Electrons

Embedded Linux Experts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
/*
 * 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/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 (promiscuous) */
#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++;
	netif_trans_update(ndev);
	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) {
		napi_complete_done(napi, rx_count);
		w5300_write(priv, W5300_IMR, IR_S0);
		mmiowb();
	}

	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,
};

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);