summaryrefslogtreecommitdiff
path: root/drivers/net/ks8842.c
blob: 6e74aa9eea4451f84b06e2a190f65842d57e9912 (plain)
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
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
/*
 * ks8842_main.c timberdale KS8842 ethernet driver
 * Copyright (c) 2009 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* Supports:
 * The Micrel KS8842 behind the timberdale FPGA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>

#define DRV_NAME "ks8842"

/* Timberdale specific Registers */
#define REG_TIMB_RST	0x1c

/* KS8842 registers */

#define REG_SELECT_BANK 0x0e

/* bank 0 registers */
#define REG_QRFCR	0x04

/* bank 2 registers */
#define REG_MARL	0x00
#define REG_MARM	0x02
#define REG_MARH	0x04

/* bank 3 registers */
#define REG_GRR		0x06

/* bank 16 registers */
#define REG_TXCR	0x00
#define REG_TXSR	0x02
#define REG_RXCR	0x04
#define REG_TXMIR	0x08
#define REG_RXMIR	0x0A

/* bank 17 registers */
#define REG_TXQCR	0x00
#define REG_RXQCR	0x02
#define REG_TXFDPR	0x04
#define REG_RXFDPR	0x06
#define REG_QMU_DATA_LO 0x08
#define REG_QMU_DATA_HI 0x0A

/* bank 18 registers */
#define REG_IER		0x00
#define IRQ_LINK_CHANGE	0x8000
#define IRQ_TX		0x4000
#define IRQ_RX		0x2000
#define IRQ_RX_OVERRUN	0x0800
#define IRQ_TX_STOPPED	0x0200
#define IRQ_RX_STOPPED	0x0100
#define IRQ_RX_ERROR	0x0080
#define ENABLED_IRQS	(IRQ_LINK_CHANGE | IRQ_TX | IRQ_RX | IRQ_RX_STOPPED | \
		IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
#define REG_ISR		0x02
#define REG_RXSR	0x04
#define RXSR_VALID	0x8000
#define RXSR_BROADCAST	0x80
#define RXSR_MULTICAST	0x40
#define RXSR_UNICAST	0x20
#define RXSR_FRAMETYPE	0x08
#define RXSR_TOO_LONG	0x04
#define RXSR_RUNT	0x02
#define RXSR_CRC_ERROR	0x01
#define RXSR_ERROR	(RXSR_TOO_LONG | RXSR_RUNT | RXSR_CRC_ERROR)

/* bank 32 registers */
#define REG_SW_ID_AND_ENABLE	0x00
#define REG_SGCR1		0x02
#define REG_SGCR2		0x04
#define REG_SGCR3		0x06

/* bank 39 registers */
#define REG_MACAR1		0x00
#define REG_MACAR2		0x02
#define REG_MACAR3		0x04

/* bank 45 registers */
#define REG_P1MBCR		0x00
#define REG_P1MBSR		0x02

/* bank 46 registers */
#define REG_P2MBCR		0x00
#define REG_P2MBSR		0x02

/* bank 48 registers */
#define REG_P1CR2		0x02

/* bank 49 registers */
#define REG_P1CR4		0x02
#define REG_P1SR		0x04

struct ks8842_adapter {
	void __iomem	*hw_addr;
	int		irq;
	struct tasklet_struct	tasklet;
	spinlock_t	lock; /* spinlock to be interrupt safe */
	struct platform_device *pdev;
};

static inline void ks8842_select_bank(struct ks8842_adapter *adapter, u16 bank)
{
	iowrite16(bank, adapter->hw_addr + REG_SELECT_BANK);
}

static inline void ks8842_write8(struct ks8842_adapter *adapter, u16 bank,
	u8 value, int offset)
{
	ks8842_select_bank(adapter, bank);
	iowrite8(value, adapter->hw_addr + offset);
}

static inline void ks8842_write16(struct ks8842_adapter *adapter, u16 bank,
	u16 value, int offset)
{
	ks8842_select_bank(adapter, bank);
	iowrite16(value, adapter->hw_addr + offset);
}

static inline void ks8842_enable_bits(struct ks8842_adapter *adapter, u16 bank,
	u16 bits, int offset)
{
	u16 reg;
	ks8842_select_bank(adapter, bank);
	reg = ioread16(adapter->hw_addr + offset);
	reg |= bits;
	iowrite16(reg, adapter->hw_addr + offset);
}

static inline void ks8842_clear_bits(struct ks8842_adapter *adapter, u16 bank,
	u16 bits, int offset)
{
	u16 reg;
	ks8842_select_bank(adapter, bank);
	reg = ioread16(adapter->hw_addr + offset);
	reg &= ~bits;
	iowrite16(reg, adapter->hw_addr + offset);
}

static inline void ks8842_write32(struct ks8842_adapter *adapter, u16 bank,
	u32 value, int offset)
{
	ks8842_select_bank(adapter, bank);
	iowrite32(value, adapter->hw_addr + offset);
}

static inline u8 ks8842_read8(struct ks8842_adapter *adapter, u16 bank,
	int offset)
{
	ks8842_select_bank(adapter, bank);
	return ioread8(adapter->hw_addr + offset);
}

static inline u16 ks8842_read16(struct ks8842_adapter *adapter, u16 bank,
	int offset)
{
	ks8842_select_bank(adapter, bank);
	return ioread16(adapter->hw_addr + offset);
}

static inline u32 ks8842_read32(struct ks8842_adapter *adapter, u16 bank,
	int offset)
{
	ks8842_select_bank(adapter, bank);
	return ioread32(adapter->hw_addr + offset);
}

static void ks8842_reset(struct ks8842_adapter *adapter)
{
	/* The KS8842 goes haywire when doing softare reset
	 * a work around in the timberdale IP is implemented to
	 * do a hardware reset instead
	ks8842_write16(adapter, 3, 1, REG_GRR);
	msleep(10);
	iowrite16(0, adapter->hw_addr + REG_GRR);
	*/
	iowrite16(32, adapter->hw_addr + REG_SELECT_BANK);
	iowrite32(0x1, adapter->hw_addr + REG_TIMB_RST);
	msleep(20);
}

static void ks8842_update_link_status(struct net_device *netdev,
	struct ks8842_adapter *adapter)
{
	/* check the status of the link */
	if (ks8842_read16(adapter, 45, REG_P1MBSR) & 0x4) {
		netif_carrier_on(netdev);
		netif_wake_queue(netdev);
	} else {
		netif_stop_queue(netdev);
		netif_carrier_off(netdev);
	}
}

static void ks8842_enable_tx(struct ks8842_adapter *adapter)
{
	ks8842_enable_bits(adapter, 16, 0x01, REG_TXCR);
}

static void ks8842_disable_tx(struct ks8842_adapter *adapter)
{
	ks8842_clear_bits(adapter, 16, 0x01, REG_TXCR);
}

static void ks8842_enable_rx(struct ks8842_adapter *adapter)
{
	ks8842_enable_bits(adapter, 16, 0x01, REG_RXCR);
}

static void ks8842_disable_rx(struct ks8842_adapter *adapter)
{
	ks8842_clear_bits(adapter, 16, 0x01, REG_RXCR);
}

static void ks8842_reset_hw(struct ks8842_adapter *adapter)
{
	/* reset the HW */
	ks8842_reset(adapter);

	/* Enable QMU Transmit flow control / transmit padding / Transmit CRC */
	ks8842_write16(adapter, 16, 0x000E, REG_TXCR);

	/* enable the receiver, uni + multi + broadcast + flow ctrl
		+ crc strip */
	ks8842_write16(adapter, 16, 0x8 | 0x20 | 0x40 | 0x80 | 0x400,
		REG_RXCR);

	/* TX frame pointer autoincrement */
	ks8842_write16(adapter, 17, 0x4000, REG_TXFDPR);

	/* RX frame pointer autoincrement */
	ks8842_write16(adapter, 17, 0x4000, REG_RXFDPR);

	/* RX 2 kb high watermark */
	ks8842_write16(adapter, 0, 0x1000, REG_QRFCR);

	/* aggresive back off in half duplex */
	ks8842_enable_bits(adapter, 32, 1 << 8, REG_SGCR1);

	/* enable no excessive collison drop */
	ks8842_enable_bits(adapter, 32, 1 << 3, REG_SGCR2);

	/* Enable port 1 force flow control / back pressure / transmit / recv */
	ks8842_write16(adapter, 48, 0x1E07, REG_P1CR2);

	/* restart port auto-negotiation */
	ks8842_enable_bits(adapter, 49, 1 << 13, REG_P1CR4);
	/* only advertise 10Mbps */
	ks8842_clear_bits(adapter, 49, 3 << 2, REG_P1CR4);

	/* Enable the transmitter */
	ks8842_enable_tx(adapter);

	/* Enable the receiver */
	ks8842_enable_rx(adapter);

	/* clear all interrupts */
	ks8842_write16(adapter, 18, 0xffff, REG_ISR);

	/* enable interrupts */
	ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);

	/* enable the switch */
	ks8842_write16(adapter, 32, 0x1, REG_SW_ID_AND_ENABLE);
}

static void ks8842_read_mac_addr(struct ks8842_adapter *adapter, u8 *dest)
{
	int i;
	u16 mac;

	for (i = 0; i < ETH_ALEN; i++)
		dest[ETH_ALEN - i - 1] = ks8842_read8(adapter, 2, REG_MARL + i);

	/* make sure the switch port uses the same MAC as the QMU */
	mac = ks8842_read16(adapter, 2, REG_MARL);
	ks8842_write16(adapter, 39, mac, REG_MACAR1);
	mac = ks8842_read16(adapter, 2, REG_MARM);
	ks8842_write16(adapter, 39, mac, REG_MACAR2);
	mac = ks8842_read16(adapter, 2, REG_MARH);
	ks8842_write16(adapter, 39, mac, REG_MACAR3);
}

static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter)
{
	return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff;
}

static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
{
	struct ks8842_adapter *adapter = netdev_priv(netdev);
	int len = skb->len;
	u32 *ptr = (u32 *)skb->data;
	u32 ctrl;

	dev_dbg(&adapter->pdev->dev,
		"%s: len %u head %p data %p tail %p end %p\n",
		__func__, skb->len, skb->head, skb->data,
		skb_tail_pointer(skb), skb_end_pointer(skb));

	/* check FIFO buffer space, we need space for CRC and command bits */
	if (ks8842_tx_fifo_space(adapter) < len + 8)
		return NETDEV_TX_BUSY;

	/* the control word, enable IRQ, port 1 and the length */
	ctrl = 0x8000 | 0x100 | (len << 16);
	ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO);

	netdev->stats.tx_bytes += len;

	/* copy buffer */
	while (len > 0) {
		iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO);
		len -= sizeof(u32);
		ptr++;
	}

	/* enqueue packet */
	ks8842_write16(adapter, 17, 1, REG_TXQCR);

	dev_kfree_skb(skb);

	return NETDEV_TX_OK;
}

static void ks8842_rx_frame(struct net_device *netdev,
	struct ks8842_adapter *adapter)
{
	u32 status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
	int len = (status >> 16) & 0x7ff;

	status &= 0xffff;

	dev_dbg(&adapter->pdev->dev, "%s - rx_data: status: %x\n",
		__func__, status);

	/* check the status */
	if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
		struct sk_buff *skb = netdev_alloc_skb(netdev, len + 2);

		dev_dbg(&adapter->pdev->dev, "%s, got package, len: %d\n",
			__func__, len);
		if (skb) {
			u32 *data;

			netdev->stats.rx_packets++;
			netdev->stats.rx_bytes += len;
			if (status & RXSR_MULTICAST)
				netdev->stats.multicast++;

			/* Align socket buffer in 4-byte boundary for
				 better performance. */
			skb_reserve(skb, 2);
			data = (u32 *)skb_put(skb, len);

			ks8842_select_bank(adapter, 17);
			while (len > 0) {
				*data++ = ioread32(adapter->hw_addr +
					REG_QMU_DATA_LO);
				len -= sizeof(u32);
			}

			skb->protocol = eth_type_trans(skb, netdev);
			netif_rx(skb);
		} else
			netdev->stats.rx_dropped++;
	} else {
		dev_dbg(&adapter->pdev->dev, "RX error, status: %x\n", status);
		netdev->stats.rx_errors++;
		if (status & RXSR_TOO_LONG)
			netdev->stats.rx_length_errors++;
		if (status & RXSR_CRC_ERROR)
			netdev->stats.rx_crc_errors++;
		if (status & RXSR_RUNT)
			netdev->stats.rx_frame_errors++;
	}

	/* set high watermark to 3K */
	ks8842_clear_bits(adapter, 0, 1 << 12, REG_QRFCR);

	/* release the frame */
	ks8842_write16(adapter, 17, 0x01, REG_RXQCR);

	/* set high watermark to 2K */
	ks8842_enable_bits(adapter, 0, 1 << 12, REG_QRFCR);
}

void ks8842_handle_rx(struct net_device *netdev, struct ks8842_adapter *adapter)
{
	u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
	dev_dbg(&adapter->pdev->dev, "%s Entry - rx_data: %d\n",
		__func__, rx_data);
	while (rx_data) {
		ks8842_rx_frame(netdev, adapter);
		rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
	}
}

void ks8842_handle_tx(struct net_device *netdev, struct ks8842_adapter *adapter)
{
	u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
	dev_dbg(&adapter->pdev->dev, "%s - entry, sr: %x\n", __func__, sr);
	netdev->stats.tx_packets++;
	if (netif_queue_stopped(netdev))
		netif_wake_queue(netdev);
}

void ks8842_handle_rx_overrun(struct net_device *netdev,
	struct ks8842_adapter *adapter)
{
	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
	netdev->stats.rx_errors++;
	netdev->stats.rx_fifo_errors++;
}

void ks8842_tasklet(unsigned long arg)
{
	struct net_device *netdev = (struct net_device *)arg;
	struct ks8842_adapter *adapter = netdev_priv(netdev);
	u16 isr;
	unsigned long flags;
	u16 entry_bank;

	/* read current bank to be able to set it back */
	spin_lock_irqsave(&adapter->lock, flags);
	entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
	spin_unlock_irqrestore(&adapter->lock, flags);

	isr = ks8842_read16(adapter, 18, REG_ISR);
	dev_dbg(&adapter->pdev->dev, "%s - ISR: 0x%x\n", __func__, isr);

	/* Ack */
	ks8842_write16(adapter, 18, isr, REG_ISR);

	if (!netif_running(netdev))
		return;

	if (isr & IRQ_LINK_CHANGE)
		ks8842_update_link_status(netdev, adapter);

	if (isr & (IRQ_RX | IRQ_RX_ERROR))
		ks8842_handle_rx(netdev, adapter);

	if (isr & IRQ_TX)
		ks8842_handle_tx(netdev, adapter);

	if (isr & IRQ_RX_OVERRUN)
		ks8842_handle_rx_overrun(netdev, adapter);

	if (isr & IRQ_TX_STOPPED) {
		ks8842_disable_tx(adapter);
		ks8842_enable_tx(adapter);
	}

	if (isr & IRQ_RX_STOPPED) {
		ks8842_disable_rx(adapter);
		ks8842_enable_rx(adapter);
	}

	/* re-enable interrupts, put back the bank selection register */
	spin_lock_irqsave(&adapter->lock, flags);
	ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
	iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
	spin_unlock_irqrestore(&adapter->lock, flags);
}

static irqreturn_t ks8842_irq(int irq, void *devid)
{
	struct ks8842_adapter *adapter = devid;
	u16 isr;
	u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
	irqreturn_t ret = IRQ_NONE;

	isr = ks8842_read16(adapter, 18, REG_ISR);
	dev_dbg(&adapter->pdev->dev, "%s - ISR: 0x%x\n", __func__, isr);

	if (isr) {
		/* disable IRQ */
		ks8842_write16(adapter, 18, 0x00, REG_IER);

		/* schedule tasklet */
		tasklet_schedule(&adapter->tasklet);

		ret = IRQ_HANDLED;
	}

	iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);

	return ret;
}


/* Netdevice operations */

static int ks8842_open(struct net_device *netdev)
{
	struct ks8842_adapter *adapter = netdev_priv(netdev);
	int err;

	dev_dbg(&adapter->pdev->dev, "%s - entry\n", __func__);

	/* reset the HW */
	ks8842_reset_hw(adapter);

	ks8842_update_link_status(netdev, adapter);

	err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
		adapter);
	if (err) {
		printk(KERN_ERR "Failed to request IRQ: %d: %d\n",
			adapter->irq, err);
		return err;
	}

	return 0;
}

static int ks8842_close(struct net_device *netdev)
{
	struct ks8842_adapter *adapter = netdev_priv(netdev);

	dev_dbg(&adapter->pdev->dev, "%s - entry\n", __func__);

	/* free the irq */
	free_irq(adapter->irq, adapter);

	/* disable the switch */
	ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);

	return 0;
}

static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb,
				     struct net_device *netdev)
{
	int ret;
	struct ks8842_adapter *adapter = netdev_priv(netdev);

	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);

	ret = ks8842_tx_frame(skb, netdev);

	if (ks8842_tx_fifo_space(adapter) <  netdev->mtu + 8)
		netif_stop_queue(netdev);

	return ret;
}

static int ks8842_set_mac(struct net_device *netdev, void *p)
{
	struct ks8842_adapter *adapter = netdev_priv(netdev);
	unsigned long flags;
	struct sockaddr *addr = p;
	char *mac = (u8 *)addr->sa_data;
	int i;

	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	memcpy(netdev->dev_addr, mac, netdev->addr_len);

	spin_lock_irqsave(&adapter->lock, flags);
	for (i = 0; i < ETH_ALEN; i++) {
		ks8842_write8(adapter, 2, mac[ETH_ALEN - i - 1], REG_MARL + i);
		ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1],
			REG_MACAR1 + i);
	}
	spin_unlock_irqrestore(&adapter->lock, flags);
	return 0;
}

static void ks8842_tx_timeout(struct net_device *netdev)
{
	struct ks8842_adapter *adapter = netdev_priv(netdev);
	unsigned long flags;

	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);

	spin_lock_irqsave(&adapter->lock, flags);
	/* disable interrupts */
	ks8842_write16(adapter, 18, 0, REG_IER);
	ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
	spin_unlock_irqrestore(&adapter->lock, flags);

	ks8842_reset_hw(adapter);

	ks8842_update_link_status(netdev, adapter);
}

static const struct net_device_ops ks8842_netdev_ops = {
	.ndo_open		= ks8842_open,
	.ndo_stop		= ks8842_close,
	.ndo_start_xmit		= ks8842_xmit_frame,
	.ndo_set_mac_address	= ks8842_set_mac,
	.ndo_tx_timeout 	= ks8842_tx_timeout,
	.ndo_validate_addr	= eth_validate_addr
};

static struct ethtool_ops ks8842_ethtool_ops = {
	.get_link		= ethtool_op_get_link,
};

static int __devinit ks8842_probe(struct platform_device *pdev)
{
	int err = -ENOMEM;
	struct resource *iomem;
	struct net_device *netdev;
	struct ks8842_adapter *adapter;
	u16 id;

	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
		goto err_mem_region;

	netdev = alloc_etherdev(sizeof(struct ks8842_adapter));
	if (!netdev)
		goto err_alloc_etherdev;

	SET_NETDEV_DEV(netdev, &pdev->dev);

	adapter = netdev_priv(netdev);
	adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
	if (!adapter->hw_addr)
		goto err_ioremap;

	adapter->irq = platform_get_irq(pdev, 0);
	if (adapter->irq < 0) {
		err = adapter->irq;
		goto err_get_irq;
	}

	adapter->pdev = pdev;

	tasklet_init(&adapter->tasklet, ks8842_tasklet, (unsigned long)netdev);
	spin_lock_init(&adapter->lock);

	netdev->netdev_ops = &ks8842_netdev_ops;
	netdev->ethtool_ops = &ks8842_ethtool_ops;

	ks8842_read_mac_addr(adapter, netdev->dev_addr);

	id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);

	strcpy(netdev->name, "eth%d");
	err = register_netdev(netdev);
	if (err)
		goto err_register;

	platform_set_drvdata(pdev, netdev);

	printk(KERN_INFO DRV_NAME
		" Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
		(id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);

	return 0;

err_register:
err_get_irq:
	iounmap(adapter->hw_addr);
err_ioremap:
	free_netdev(netdev);
err_alloc_etherdev:
	release_mem_region(iomem->start, resource_size(iomem));
err_mem_region:
	return err;
}

static int __devexit ks8842_remove(struct platform_device *pdev)
{
	struct net_device *netdev = platform_get_drvdata(pdev);
	struct ks8842_adapter *adapter = netdev_priv(netdev);
	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	unregister_netdev(netdev);
	tasklet_kill(&adapter->tasklet);
	iounmap(adapter->hw_addr);
	free_netdev(netdev);
	release_mem_region(iomem->start, resource_size(iomem));
	platform_set_drvdata(pdev, NULL);
	return 0;
}


static struct platform_driver ks8842_platform_driver = {
	.driver = {
		.name	= DRV_NAME,
		.owner	= THIS_MODULE,
	},
	.probe		= ks8842_probe,
	.remove		= ks8842_remove,
};

static int __init ks8842_init(void)
{
	return platform_driver_register(&ks8842_platform_driver);
}

static void __exit ks8842_exit(void)
{
	platform_driver_unregister(&ks8842_platform_driver);
}

module_init(ks8842_init);
module_exit(ks8842_exit);

MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:ks8842");