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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / net / ethernet / nuvoton / w90p910_ether.c
blobb75a0497d58dbdbdb362d8e857ce8f75bf7e22f9
1 /*
2 * Copyright (c) 2008-2009 Nuvoton technology corporation.
3 *
4 * Wan ZongShun <mcuos.com@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation;version 2 of the License.
9 *
10 */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/mii.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/skbuff.h>
18 #include <linux/ethtool.h>
19 #include <linux/platform_device.h>
20 #include <linux/clk.h>
21 #include <linux/gfp.h>
22
23 #define DRV_MODULE_NAME "w90p910-emc"
24 #define DRV_MODULE_VERSION "0.1"
25
26 /* Ethernet MAC Registers */
27 #define REG_CAMCMR 0x00
28 #define REG_CAMEN 0x04
29 #define REG_CAMM_BASE 0x08
30 #define REG_CAML_BASE 0x0c
31 #define REG_TXDLSA 0x88
32 #define REG_RXDLSA 0x8C
33 #define REG_MCMDR 0x90
34 #define REG_MIID 0x94
35 #define REG_MIIDA 0x98
36 #define REG_FFTCR 0x9C
37 #define REG_TSDR 0xa0
38 #define REG_RSDR 0xa4
39 #define REG_DMARFC 0xa8
40 #define REG_MIEN 0xac
41 #define REG_MISTA 0xb0
42 #define REG_CTXDSA 0xcc
43 #define REG_CTXBSA 0xd0
44 #define REG_CRXDSA 0xd4
45 #define REG_CRXBSA 0xd8
46
47 /* mac controller bit */
48 #define MCMDR_RXON 0x01
49 #define MCMDR_ACP (0x01 << 3)
50 #define MCMDR_SPCRC (0x01 << 5)
51 #define MCMDR_TXON (0x01 << 8)
52 #define MCMDR_FDUP (0x01 << 18)
53 #define MCMDR_ENMDC (0x01 << 19)
54 #define MCMDR_OPMOD (0x01 << 20)
55 #define SWR (0x01 << 24)
56
57 /* cam command regiser */
58 #define CAMCMR_AUP 0x01
59 #define CAMCMR_AMP (0x01 << 1)
60 #define CAMCMR_ABP (0x01 << 2)
61 #define CAMCMR_CCAM (0x01 << 3)
62 #define CAMCMR_ECMP (0x01 << 4)
63 #define CAM0EN 0x01
64
65 /* mac mii controller bit */
66 #define MDCCR (0x0a << 20)
67 #define PHYAD (0x01 << 8)
68 #define PHYWR (0x01 << 16)
69 #define PHYBUSY (0x01 << 17)
70 #define PHYPRESP (0x01 << 18)
71 #define CAM_ENTRY_SIZE 0x08
72
73 /* rx and tx status */
74 #define TXDS_TXCP (0x01 << 19)
75 #define RXDS_CRCE (0x01 << 17)
76 #define RXDS_PTLE (0x01 << 19)
77 #define RXDS_RXGD (0x01 << 20)
78 #define RXDS_ALIE (0x01 << 21)
79 #define RXDS_RP (0x01 << 22)
80
81 /* mac interrupt status*/
82 #define MISTA_EXDEF (0x01 << 19)
83 #define MISTA_TXBERR (0x01 << 24)
84 #define MISTA_TDU (0x01 << 23)
85 #define MISTA_RDU (0x01 << 10)
86 #define MISTA_RXBERR (0x01 << 11)
87
88 #define ENSTART 0x01
89 #define ENRXINTR 0x01
90 #define ENRXGD (0x01 << 4)
91 #define ENRXBERR (0x01 << 11)
92 #define ENTXINTR (0x01 << 16)
93 #define ENTXCP (0x01 << 18)
94 #define ENTXABT (0x01 << 21)
95 #define ENTXBERR (0x01 << 24)
96 #define ENMDC (0x01 << 19)
97 #define PHYBUSY (0x01 << 17)
98 #define MDCCR_VAL 0xa00000
99
100 /* rx and tx owner bit */
101 #define RX_OWEN_DMA (0x01 << 31)
102 #define RX_OWEN_CPU (~(0x03 << 30))
103 #define TX_OWEN_DMA (0x01 << 31)
104 #define TX_OWEN_CPU (~(0x01 << 31))
105
106 /* tx frame desc controller bit */
107 #define MACTXINTEN 0x04
108 #define CRCMODE 0x02
109 #define PADDINGMODE 0x01
110
111 /* fftcr controller bit */
112 #define TXTHD (0x03 << 8)
113 #define BLENGTH (0x01 << 20)
114
115 /* global setting for driver */
116 #define RX_DESC_SIZE 50
117 #define TX_DESC_SIZE 10
118 #define MAX_RBUFF_SZ 0x600
119 #define MAX_TBUFF_SZ 0x600
120 #define TX_TIMEOUT (HZ/2)
121 #define DELAY 1000
122 #define CAM0 0x0
123
124 static int w90p910_mdio_read(struct net_device *dev, int phy_id, int reg);
125
126 struct w90p910_rxbd {
127 unsigned int sl;
128 unsigned int buffer;
129 unsigned int reserved;
130 unsigned int next;
131 };
132
133 struct w90p910_txbd {
134 unsigned int mode;
135 unsigned int buffer;
136 unsigned int sl;
137 unsigned int next;
138 };
139
140 struct recv_pdesc {
141 struct w90p910_rxbd desclist[RX_DESC_SIZE];
142 char recv_buf[RX_DESC_SIZE][MAX_RBUFF_SZ];
143 };
144
145 struct tran_pdesc {
146 struct w90p910_txbd desclist[TX_DESC_SIZE];
147 char tran_buf[TX_DESC_SIZE][MAX_TBUFF_SZ];
148 };
149
150 struct w90p910_ether {
151 struct recv_pdesc *rdesc;
152 struct tran_pdesc *tdesc;
153 dma_addr_t rdesc_phys;
154 dma_addr_t tdesc_phys;
155 struct net_device_stats stats;
156 struct platform_device *pdev;
157 struct resource *res;
158 struct sk_buff *skb;
159 struct clk *clk;
160 struct clk *rmiiclk;
161 struct mii_if_info mii;
162 struct timer_list check_timer;
163 void __iomem *reg;
164 int rxirq;
165 int txirq;
166 unsigned int cur_tx;
167 unsigned int cur_rx;
168 unsigned int finish_tx;
169 unsigned int rx_packets;
170 unsigned int rx_bytes;
171 unsigned int start_tx_ptr;
172 unsigned int start_rx_ptr;
173 unsigned int linkflag;
174 };
175
176 static void update_linkspeed_register(struct net_device *dev,
177 unsigned int speed, unsigned int duplex)
178 {
179 struct w90p910_ether *ether = netdev_priv(dev);
180 unsigned int val;
181
182 val = __raw_readl(ether->reg + REG_MCMDR);
183
184 if (speed == SPEED_100) {
185 /* 100 full/half duplex */
186 if (duplex == DUPLEX_FULL) {
187 val |= (MCMDR_OPMOD | MCMDR_FDUP);
188 } else {
189 val |= MCMDR_OPMOD;
190 val &= ~MCMDR_FDUP;
191 }
192 } else {
193 /* 10 full/half duplex */
194 if (duplex == DUPLEX_FULL) {
195 val |= MCMDR_FDUP;
196 val &= ~MCMDR_OPMOD;
197 } else {
198 val &= ~(MCMDR_FDUP | MCMDR_OPMOD);
199 }
200 }
201
202 __raw_writel(val, ether->reg + REG_MCMDR);
203 }
204
205 static void update_linkspeed(struct net_device *dev)
206 {
207 struct w90p910_ether *ether = netdev_priv(dev);
208 struct platform_device *pdev;
209 unsigned int bmsr, bmcr, lpa, speed, duplex;
210
211 pdev = ether->pdev;
212
213 if (!mii_link_ok(&ether->mii)) {
214 ether->linkflag = 0x0;
215 netif_carrier_off(dev);
216 dev_warn(&pdev->dev, "%s: Link down.\n", dev->name);
217 return;
218 }
219
220 if (ether->linkflag == 1)
221 return;
222
223 bmsr = w90p910_mdio_read(dev, ether->mii.phy_id, MII_BMSR);
224 bmcr = w90p910_mdio_read(dev, ether->mii.phy_id, MII_BMCR);
225
226 if (bmcr & BMCR_ANENABLE) {
227 if (!(bmsr & BMSR_ANEGCOMPLETE))
228 return;
229
230 lpa = w90p910_mdio_read(dev, ether->mii.phy_id, MII_LPA);
231
232 if ((lpa & LPA_100FULL) || (lpa & LPA_100HALF))
233 speed = SPEED_100;
234 else
235 speed = SPEED_10;
236
237 if ((lpa & LPA_100FULL) || (lpa & LPA_10FULL))
238 duplex = DUPLEX_FULL;
239 else
240 duplex = DUPLEX_HALF;
241
242 } else {
243 speed = (bmcr & BMCR_SPEED100) ? SPEED_100 : SPEED_10;
244 duplex = (bmcr & BMCR_FULLDPLX) ? DUPLEX_FULL : DUPLEX_HALF;
245 }
246
247 update_linkspeed_register(dev, speed, duplex);
248
249 dev_info(&pdev->dev, "%s: Link now %i-%s\n", dev->name, speed,
250 (duplex == DUPLEX_FULL) ? "FullDuplex" : "HalfDuplex");
251 ether->linkflag = 0x01;
252
253 netif_carrier_on(dev);
254 }
255
256 static void w90p910_check_link(unsigned long dev_id)
257 {
258 struct net_device *dev = (struct net_device *) dev_id;
259 struct w90p910_ether *ether = netdev_priv(dev);
260
261 update_linkspeed(dev);
262 mod_timer(&ether->check_timer, jiffies + msecs_to_jiffies(1000));
263 }
264
265 static void w90p910_write_cam(struct net_device *dev,
266 unsigned int x, unsigned char *pval)
267 {
268 struct w90p910_ether *ether = netdev_priv(dev);
269 unsigned int msw, lsw;
270
271 msw = (pval[0] << 24) | (pval[1] << 16) | (pval[2] << 8) | pval[3];
272
273 lsw = (pval[4] << 24) | (pval[5] << 16);
274
275 __raw_writel(lsw, ether->reg + REG_CAML_BASE + x * CAM_ENTRY_SIZE);
276 __raw_writel(msw, ether->reg + REG_CAMM_BASE + x * CAM_ENTRY_SIZE);
277 }
278
279 static int w90p910_init_desc(struct net_device *dev)
280 {
281 struct w90p910_ether *ether;
282 struct w90p910_txbd *tdesc;
283 struct w90p910_rxbd *rdesc;
284 struct platform_device *pdev;
285 unsigned int i;
286
287 ether = netdev_priv(dev);
288 pdev = ether->pdev;
289
290 ether->tdesc = (struct tran_pdesc *)
291 dma_alloc_coherent(&pdev->dev, sizeof(struct tran_pdesc),
292 &ether->tdesc_phys, GFP_KERNEL);
293
294 if (!ether->tdesc) {
295 dev_err(&pdev->dev, "Failed to allocate memory for tx desc\n");
296 return -ENOMEM;
297 }
298
299 ether->rdesc = (struct recv_pdesc *)
300 dma_alloc_coherent(&pdev->dev, sizeof(struct recv_pdesc),
301 &ether->rdesc_phys, GFP_KERNEL);
302
303 if (!ether->rdesc) {
304 dev_err(&pdev->dev, "Failed to allocate memory for rx desc\n");
305 dma_free_coherent(&pdev->dev, sizeof(struct tran_pdesc),
306 ether->tdesc, ether->tdesc_phys);
307 return -ENOMEM;
308 }
309
310 for (i = 0; i < TX_DESC_SIZE; i++) {
311 unsigned int offset;
312
313 tdesc = &(ether->tdesc->desclist[i]);
314
315 if (i == TX_DESC_SIZE - 1)
316 offset = offsetof(struct tran_pdesc, desclist[0]);
317 else
318 offset = offsetof(struct tran_pdesc, desclist[i + 1]);
319
320 tdesc->next = ether->tdesc_phys + offset;
321 tdesc->buffer = ether->tdesc_phys +
322 offsetof(struct tran_pdesc, tran_buf[i]);
323 tdesc->sl = 0;
324 tdesc->mode = 0;
325 }
326
327 ether->start_tx_ptr = ether->tdesc_phys;
328
329 for (i = 0; i < RX_DESC_SIZE; i++) {
330 unsigned int offset;
331
332 rdesc = &(ether->rdesc->desclist[i]);
333
334 if (i == RX_DESC_SIZE - 1)
335 offset = offsetof(struct recv_pdesc, desclist[0]);
336 else
337 offset = offsetof(struct recv_pdesc, desclist[i + 1]);
338
339 rdesc->next = ether->rdesc_phys + offset;
340 rdesc->sl = RX_OWEN_DMA;
341 rdesc->buffer = ether->rdesc_phys +
342 offsetof(struct recv_pdesc, recv_buf[i]);
343 }
344
345 ether->start_rx_ptr = ether->rdesc_phys;
346
347 return 0;
348 }
349
350 static void w90p910_set_fifo_threshold(struct net_device *dev)
351 {
352 struct w90p910_ether *ether = netdev_priv(dev);
353 unsigned int val;
354
355 val = TXTHD | BLENGTH;
356 __raw_writel(val, ether->reg + REG_FFTCR);
357 }
358
359 static void w90p910_return_default_idle(struct net_device *dev)
360 {
361 struct w90p910_ether *ether = netdev_priv(dev);
362 unsigned int val;
363
364 val = __raw_readl(ether->reg + REG_MCMDR);
365 val |= SWR;
366 __raw_writel(val, ether->reg + REG_MCMDR);
367 }
368
369 static void w90p910_trigger_rx(struct net_device *dev)
370 {
371 struct w90p910_ether *ether = netdev_priv(dev);
372
373 __raw_writel(ENSTART, ether->reg + REG_RSDR);
374 }
375
376 static void w90p910_trigger_tx(struct net_device *dev)
377 {
378 struct w90p910_ether *ether = netdev_priv(dev);
379
380 __raw_writel(ENSTART, ether->reg + REG_TSDR);
381 }
382
383 static void w90p910_enable_mac_interrupt(struct net_device *dev)
384 {
385 struct w90p910_ether *ether = netdev_priv(dev);
386 unsigned int val;
387
388 val = ENTXINTR | ENRXINTR | ENRXGD | ENTXCP;
389 val |= ENTXBERR | ENRXBERR | ENTXABT;
390
391 __raw_writel(val, ether->reg + REG_MIEN);
392 }
393
394 static void w90p910_get_and_clear_int(struct net_device *dev,
395 unsigned int *val)
396 {
397 struct w90p910_ether *ether = netdev_priv(dev);
398
399 *val = __raw_readl(ether->reg + REG_MISTA);
400 __raw_writel(*val, ether->reg + REG_MISTA);
401 }
402
403 static void w90p910_set_global_maccmd(struct net_device *dev)
404 {
405 struct w90p910_ether *ether = netdev_priv(dev);
406 unsigned int val;
407
408 val = __raw_readl(ether->reg + REG_MCMDR);
409 val |= MCMDR_SPCRC | MCMDR_ENMDC | MCMDR_ACP | ENMDC;
410 __raw_writel(val, ether->reg + REG_MCMDR);
411 }
412
413 static void w90p910_enable_cam(struct net_device *dev)
414 {
415 struct w90p910_ether *ether = netdev_priv(dev);
416 unsigned int val;
417
418 w90p910_write_cam(dev, CAM0, dev->dev_addr);
419
420 val = __raw_readl(ether->reg + REG_CAMEN);
421 val |= CAM0EN;
422 __raw_writel(val, ether->reg + REG_CAMEN);
423 }
424
425 static void w90p910_enable_cam_command(struct net_device *dev)
426 {
427 struct w90p910_ether *ether = netdev_priv(dev);
428 unsigned int val;
429
430 val = CAMCMR_ECMP | CAMCMR_ABP | CAMCMR_AMP;
431 __raw_writel(val, ether->reg + REG_CAMCMR);
432 }
433
434 static void w90p910_enable_tx(struct net_device *dev, unsigned int enable)
435 {
436 struct w90p910_ether *ether = netdev_priv(dev);
437 unsigned int val;
438
439 val = __raw_readl(ether->reg + REG_MCMDR);
440
441 if (enable)
442 val |= MCMDR_TXON;
443 else
444 val &= ~MCMDR_TXON;
445
446 __raw_writel(val, ether->reg + REG_MCMDR);
447 }
448
449 static void w90p910_enable_rx(struct net_device *dev, unsigned int enable)
450 {
451 struct w90p910_ether *ether = netdev_priv(dev);
452 unsigned int val;
453
454 val = __raw_readl(ether->reg + REG_MCMDR);
455
456 if (enable)
457 val |= MCMDR_RXON;
458 else
459 val &= ~MCMDR_RXON;
460
461 __raw_writel(val, ether->reg + REG_MCMDR);
462 }
463
464 static void w90p910_set_curdest(struct net_device *dev)
465 {
466 struct w90p910_ether *ether = netdev_priv(dev);
467
468 __raw_writel(ether->start_rx_ptr, ether->reg + REG_RXDLSA);
469 __raw_writel(ether->start_tx_ptr, ether->reg + REG_TXDLSA);
470 }
471
472 static void w90p910_reset_mac(struct net_device *dev)
473 {
474 struct w90p910_ether *ether = netdev_priv(dev);
475
476 w90p910_enable_tx(dev, 0);
477 w90p910_enable_rx(dev, 0);
478 w90p910_set_fifo_threshold(dev);
479 w90p910_return_default_idle(dev);
480
481 if (!netif_queue_stopped(dev))
482 netif_stop_queue(dev);
483
484 w90p910_init_desc(dev);
485
486 dev->trans_start = jiffies; /* prevent tx timeout */
487 ether->cur_tx = 0x0;
488 ether->finish_tx = 0x0;
489 ether->cur_rx = 0x0;
490
491 w90p910_set_curdest(dev);
492 w90p910_enable_cam(dev);
493 w90p910_enable_cam_command(dev);
494 w90p910_enable_mac_interrupt(dev);
495 w90p910_enable_tx(dev, 1);
496 w90p910_enable_rx(dev, 1);
497 w90p910_trigger_tx(dev);
498 w90p910_trigger_rx(dev);
499
500 dev->trans_start = jiffies; /* prevent tx timeout */
501
502 if (netif_queue_stopped(dev))
503 netif_wake_queue(dev);
504 }
505
506 static void w90p910_mdio_write(struct net_device *dev,
507 int phy_id, int reg, int data)
508 {
509 struct w90p910_ether *ether = netdev_priv(dev);
510 struct platform_device *pdev;
511 unsigned int val, i;
512
513 pdev = ether->pdev;
514
515 __raw_writel(data, ether->reg + REG_MIID);
516
517 val = (phy_id << 0x08) | reg;
518 val |= PHYBUSY | PHYWR | MDCCR_VAL;
519 __raw_writel(val, ether->reg + REG_MIIDA);
520
521 for (i = 0; i < DELAY; i++) {
522 if ((__raw_readl(ether->reg + REG_MIIDA) & PHYBUSY) == 0)
523 break;
524 }
525
526 if (i == DELAY)
527 dev_warn(&pdev->dev, "mdio write timed out\n");
528 }
529
530 static int w90p910_mdio_read(struct net_device *dev, int phy_id, int reg)
531 {
532 struct w90p910_ether *ether = netdev_priv(dev);
533 struct platform_device *pdev;
534 unsigned int val, i, data;
535
536 pdev = ether->pdev;
537
538 val = (phy_id << 0x08) | reg;
539 val |= PHYBUSY | MDCCR_VAL;
540 __raw_writel(val, ether->reg + REG_MIIDA);
541
542 for (i = 0; i < DELAY; i++) {
543 if ((__raw_readl(ether->reg + REG_MIIDA) & PHYBUSY) == 0)
544 break;
545 }
546
547 if (i == DELAY) {
548 dev_warn(&pdev->dev, "mdio read timed out\n");
549 data = 0xffff;
550 } else {
551 data = __raw_readl(ether->reg + REG_MIID);
552 }
553
554 return data;
555 }
556
557 static int w90p910_set_mac_address(struct net_device *dev, void *addr)
558 {
559 struct sockaddr *address = addr;
560
561 if (!is_valid_ether_addr(address->sa_data))
562 return -EADDRNOTAVAIL;
563
564 memcpy(dev->dev_addr, address->sa_data, dev->addr_len);
565 w90p910_write_cam(dev, CAM0, dev->dev_addr);
566
567 return 0;
568 }
569
570 static int w90p910_ether_close(struct net_device *dev)
571 {
572 struct w90p910_ether *ether = netdev_priv(dev);
573 struct platform_device *pdev;
574
575 pdev = ether->pdev;
576
577 dma_free_coherent(&pdev->dev, sizeof(struct recv_pdesc),
578 ether->rdesc, ether->rdesc_phys);
579 dma_free_coherent(&pdev->dev, sizeof(struct tran_pdesc),
580 ether->tdesc, ether->tdesc_phys);
581
582 netif_stop_queue(dev);
583
584 del_timer_sync(&ether->check_timer);
585 clk_disable(ether->rmiiclk);
586 clk_disable(ether->clk);
587
588 free_irq(ether->txirq, dev);
589 free_irq(ether->rxirq, dev);
590
591 return 0;
592 }
593
594 static struct net_device_stats *w90p910_ether_stats(struct net_device *dev)
595 {
596 struct w90p910_ether *ether;
597
598 ether = netdev_priv(dev);
599
600 return &ether->stats;
601 }
602
603 static int w90p910_send_frame(struct net_device *dev,
604 unsigned char *data, int length)
605 {
606 struct w90p910_ether *ether;
607 struct w90p910_txbd *txbd;
608 struct platform_device *pdev;
609 unsigned char *buffer;
610
611 ether = netdev_priv(dev);
612 pdev = ether->pdev;
613
614 txbd = &ether->tdesc->desclist[ether->cur_tx];
615 buffer = ether->tdesc->tran_buf[ether->cur_tx];
616
617 if (length > 1514) {
618 dev_err(&pdev->dev, "send data %d bytes, check it\n", length);
619 length = 1514;
620 }
621
622 txbd->sl = length & 0xFFFF;
623
624 memcpy(buffer, data, length);
625
626 txbd->mode = TX_OWEN_DMA | PADDINGMODE | CRCMODE | MACTXINTEN;
627
628 w90p910_enable_tx(dev, 1);
629
630 w90p910_trigger_tx(dev);
631
632 if (++ether->cur_tx >= TX_DESC_SIZE)
633 ether->cur_tx = 0;
634
635 txbd = &ether->tdesc->desclist[ether->cur_tx];
636
637 if (txbd->mode & TX_OWEN_DMA)
638 netif_stop_queue(dev);
639
640 return 0;
641 }
642
643 static int w90p910_ether_start_xmit(struct sk_buff *skb, struct net_device *dev)
644 {
645 struct w90p910_ether *ether = netdev_priv(dev);
646
647 if (!(w90p910_send_frame(dev, skb->data, skb->len))) {
648 ether->skb = skb;
649 dev_kfree_skb_irq(skb);
650 return 0;
651 }
652 return -EAGAIN;
653 }
654
655 static irqreturn_t w90p910_tx_interrupt(int irq, void *dev_id)
656 {
657 struct w90p910_ether *ether;
658 struct w90p910_txbd *txbd;
659 struct platform_device *pdev;
660 struct net_device *dev;
661 unsigned int cur_entry, entry, status;
662
663 dev = dev_id;
664 ether = netdev_priv(dev);
665 pdev = ether->pdev;
666
667 w90p910_get_and_clear_int(dev, &status);
668
669 cur_entry = __raw_readl(ether->reg + REG_CTXDSA);
670
671 entry = ether->tdesc_phys +
672 offsetof(struct tran_pdesc, desclist[ether->finish_tx]);
673
674 while (entry != cur_entry) {
675 txbd = &ether->tdesc->desclist[ether->finish_tx];
676
677 if (++ether->finish_tx >= TX_DESC_SIZE)
678 ether->finish_tx = 0;
679
680 if (txbd->sl & TXDS_TXCP) {
681 ether->stats.tx_packets++;
682 ether->stats.tx_bytes += txbd->sl & 0xFFFF;
683 } else {
684 ether->stats.tx_errors++;
685 }
686
687 txbd->sl = 0x0;
688 txbd->mode = 0x0;
689
690 if (netif_queue_stopped(dev))
691 netif_wake_queue(dev);
692
693 entry = ether->tdesc_phys +
694 offsetof(struct tran_pdesc, desclist[ether->finish_tx]);
695 }
696
697 if (status & MISTA_EXDEF) {
698 dev_err(&pdev->dev, "emc defer exceed interrupt\n");
699 } else if (status & MISTA_TXBERR) {
700 dev_err(&pdev->dev, "emc bus error interrupt\n");
701 w90p910_reset_mac(dev);
702 } else if (status & MISTA_TDU) {
703 if (netif_queue_stopped(dev))
704 netif_wake_queue(dev);
705 }
706
707 return IRQ_HANDLED;
708 }
709
710 static void netdev_rx(struct net_device *dev)
711 {
712 struct w90p910_ether *ether;
713 struct w90p910_rxbd *rxbd;
714 struct platform_device *pdev;
715 struct sk_buff *skb;
716 unsigned char *data;
717 unsigned int length, status, val, entry;
718
719 ether = netdev_priv(dev);
720 pdev = ether->pdev;
721
722 rxbd = &ether->rdesc->desclist[ether->cur_rx];
723
724 do {
725 val = __raw_readl(ether->reg + REG_CRXDSA);
726
727 entry = ether->rdesc_phys +
728 offsetof(struct recv_pdesc, desclist[ether->cur_rx]);
729
730 if (val == entry)
731 break;
732
733 status = rxbd->sl;
734 length = status & 0xFFFF;
735
736 if (status & RXDS_RXGD) {
737 data = ether->rdesc->recv_buf[ether->cur_rx];
738 skb = dev_alloc_skb(length+2);
739 if (!skb) {
740 dev_err(&pdev->dev, "get skb buffer error\n");
741 ether->stats.rx_dropped++;
742 return;
743 }
744
745 skb_reserve(skb, 2);
746 skb_put(skb, length);
747 skb_copy_to_linear_data(skb, data, length);
748 skb->protocol = eth_type_trans(skb, dev);
749 ether->stats.rx_packets++;
750 ether->stats.rx_bytes += length;
751 netif_rx(skb);
752 } else {
753 ether->stats.rx_errors++;
754
755 if (status & RXDS_RP) {
756 dev_err(&pdev->dev, "rx runt err\n");
757 ether->stats.rx_length_errors++;
758 } else if (status & RXDS_CRCE) {
759 dev_err(&pdev->dev, "rx crc err\n");
760 ether->stats.rx_crc_errors++;
761 } else if (status & RXDS_ALIE) {
762 dev_err(&pdev->dev, "rx aligment err\n");
763 ether->stats.rx_frame_errors++;
764 } else if (status & RXDS_PTLE) {
765 dev_err(&pdev->dev, "rx longer err\n");
766 ether->stats.rx_over_errors++;
767 }
768 }
769
770 rxbd->sl = RX_OWEN_DMA;
771 rxbd->reserved = 0x0;
772
773 if (++ether->cur_rx >= RX_DESC_SIZE)
774 ether->cur_rx = 0;
775
776 rxbd = &ether->rdesc->desclist[ether->cur_rx];
777
778 } while (1);
779 }
780
781 static irqreturn_t w90p910_rx_interrupt(int irq, void *dev_id)
782 {
783 struct net_device *dev;
784 struct w90p910_ether *ether;
785 struct platform_device *pdev;
786 unsigned int status;
787
788 dev = dev_id;
789 ether = netdev_priv(dev);
790 pdev = ether->pdev;
791
792 w90p910_get_and_clear_int(dev, &status);
793
794 if (status & MISTA_RDU) {
795 netdev_rx(dev);
796 w90p910_trigger_rx(dev);
797
798 return IRQ_HANDLED;
799 } else if (status & MISTA_RXBERR) {
800 dev_err(&pdev->dev, "emc rx bus error\n");
801 w90p910_reset_mac(dev);
802 }
803
804 netdev_rx(dev);
805 return IRQ_HANDLED;
806 }
807
808 static int w90p910_ether_open(struct net_device *dev)
809 {
810 struct w90p910_ether *ether;
811 struct platform_device *pdev;
812
813 ether = netdev_priv(dev);
814 pdev = ether->pdev;
815
816 w90p910_reset_mac(dev);
817 w90p910_set_fifo_threshold(dev);
818 w90p910_set_curdest(dev);
819 w90p910_enable_cam(dev);
820 w90p910_enable_cam_command(dev);
821 w90p910_enable_mac_interrupt(dev);
822 w90p910_set_global_maccmd(dev);
823 w90p910_enable_rx(dev, 1);
824
825 clk_enable(ether->rmiiclk);
826 clk_enable(ether->clk);
827
828 ether->rx_packets = 0x0;
829 ether->rx_bytes = 0x0;
830
831 if (request_irq(ether->txirq, w90p910_tx_interrupt,
832 0x0, pdev->name, dev)) {
833 dev_err(&pdev->dev, "register irq tx failed\n");
834 return -EAGAIN;
835 }
836
837 if (request_irq(ether->rxirq, w90p910_rx_interrupt,
838 0x0, pdev->name, dev)) {
839 dev_err(&pdev->dev, "register irq rx failed\n");
840 free_irq(ether->txirq, dev);
841 return -EAGAIN;
842 }
843
844 mod_timer(&ether->check_timer, jiffies + msecs_to_jiffies(1000));
845 netif_start_queue(dev);
846 w90p910_trigger_rx(dev);
847
848 dev_info(&pdev->dev, "%s is OPENED\n", dev->name);
849
850 return 0;
851 }
852
853 static void w90p910_ether_set_multicast_list(struct net_device *dev)
854 {
855 struct w90p910_ether *ether;
856 unsigned int rx_mode;
857
858 ether = netdev_priv(dev);
859
860 if (dev->flags & IFF_PROMISC)
861 rx_mode = CAMCMR_AUP | CAMCMR_AMP | CAMCMR_ABP | CAMCMR_ECMP;
862 else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev))
863 rx_mode = CAMCMR_AMP | CAMCMR_ABP | CAMCMR_ECMP;
864 else
865 rx_mode = CAMCMR_ECMP | CAMCMR_ABP;
866 __raw_writel(rx_mode, ether->reg + REG_CAMCMR);
867 }
868
869 static int w90p910_ether_ioctl(struct net_device *dev,
870 struct ifreq *ifr, int cmd)
871 {
872 struct w90p910_ether *ether = netdev_priv(dev);
873 struct mii_ioctl_data *data = if_mii(ifr);
874
875 return generic_mii_ioctl(&ether->mii, data, cmd, NULL);
876 }
877
878 static void w90p910_get_drvinfo(struct net_device *dev,
879 struct ethtool_drvinfo *info)
880 {
881 strcpy(info->driver, DRV_MODULE_NAME);
882 strcpy(info->version, DRV_MODULE_VERSION);
883 }
884
885 static int w90p910_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
886 {
887 struct w90p910_ether *ether = netdev_priv(dev);
888 return mii_ethtool_gset(&ether->mii, cmd);
889 }
890
891 static int w90p910_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
892 {
893 struct w90p910_ether *ether = netdev_priv(dev);
894 return mii_ethtool_sset(&ether->mii, cmd);
895 }
896
897 static int w90p910_nway_reset(struct net_device *dev)
898 {
899 struct w90p910_ether *ether = netdev_priv(dev);
900 return mii_nway_restart(&ether->mii);
901 }
902
903 static u32 w90p910_get_link(struct net_device *dev)
904 {
905 struct w90p910_ether *ether = netdev_priv(dev);
906 return mii_link_ok(&ether->mii);
907 }
908
909 static const struct ethtool_ops w90p910_ether_ethtool_ops = {
910 .get_settings = w90p910_get_settings,
911 .set_settings = w90p910_set_settings,
912 .get_drvinfo = w90p910_get_drvinfo,
913 .nway_reset = w90p910_nway_reset,
914 .get_link = w90p910_get_link,
915 };
916
917 static const struct net_device_ops w90p910_ether_netdev_ops = {
918 .ndo_open = w90p910_ether_open,
919 .ndo_stop = w90p910_ether_close,
920 .ndo_start_xmit = w90p910_ether_start_xmit,
921 .ndo_get_stats = w90p910_ether_stats,
922 .ndo_set_rx_mode = w90p910_ether_set_multicast_list,
923 .ndo_set_mac_address = w90p910_set_mac_address,
924 .ndo_do_ioctl = w90p910_ether_ioctl,
925 .ndo_validate_addr = eth_validate_addr,
926 .ndo_change_mtu = eth_change_mtu,
927 };
928
929 static void __init get_mac_address(struct net_device *dev)
930 {
931 struct w90p910_ether *ether = netdev_priv(dev);
932 struct platform_device *pdev;
933 char addr[6];
934
935 pdev = ether->pdev;
936
937 addr[0] = 0x00;
938 addr[1] = 0x02;
939 addr[2] = 0xac;
940 addr[3] = 0x55;
941 addr[4] = 0x88;
942 addr[5] = 0xa8;
943
944 if (is_valid_ether_addr(addr))
945 memcpy(dev->dev_addr, &addr, 0x06);
946 else
947 dev_err(&pdev->dev, "invalid mac address\n");
948 }
949
950 static int w90p910_ether_setup(struct net_device *dev)
951 {
952 struct w90p910_ether *ether = netdev_priv(dev);
953
954 ether_setup(dev);
955 dev->netdev_ops = &w90p910_ether_netdev_ops;
956 dev->ethtool_ops = &w90p910_ether_ethtool_ops;
957
958 dev->tx_queue_len = 16;
959 dev->dma = 0x0;
960 dev->watchdog_timeo = TX_TIMEOUT;
961
962 get_mac_address(dev);
963
964 ether->cur_tx = 0x0;
965 ether->cur_rx = 0x0;
966 ether->finish_tx = 0x0;
967 ether->linkflag = 0x0;
968 ether->mii.phy_id = 0x01;
969 ether->mii.phy_id_mask = 0x1f;
970 ether->mii.reg_num_mask = 0x1f;
971 ether->mii.dev = dev;
972 ether->mii.mdio_read = w90p910_mdio_read;
973 ether->mii.mdio_write = w90p910_mdio_write;
974
975 setup_timer(&ether->check_timer, w90p910_check_link,
976 (unsigned long)dev);
977
978 return 0;
979 }
980
981 static int __devinit w90p910_ether_probe(struct platform_device *pdev)
982 {
983 struct w90p910_ether *ether;
984 struct net_device *dev;
985 int error;
986
987 dev = alloc_etherdev(sizeof(struct w90p910_ether));
988 if (!dev)
989 return -ENOMEM;
990
991 ether = netdev_priv(dev);
992
993 ether->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
994 if (ether->res == NULL) {
995 dev_err(&pdev->dev, "failed to get I/O memory\n");
996 error = -ENXIO;
997 goto failed_free;
998 }
999
1000 if (!request_mem_region(ether->res->start,
1001 resource_size(ether->res), pdev->name)) {
1002 dev_err(&pdev->dev, "failed to request I/O memory\n");
1003 error = -EBUSY;
1004 goto failed_free;
1005 }
1006
1007 ether->reg = ioremap(ether->res->start, resource_size(ether->res));
1008 if (ether->reg == NULL) {
1009 dev_err(&pdev->dev, "failed to remap I/O memory\n");
1010 error = -ENXIO;
1011 goto failed_free_mem;
1012 }
1013
1014 ether->txirq = platform_get_irq(pdev, 0);
1015 if (ether->txirq < 0) {
1016 dev_err(&pdev->dev, "failed to get ether tx irq\n");
1017 error = -ENXIO;
1018 goto failed_free_io;
1019 }
1020
1021 ether->rxirq = platform_get_irq(pdev, 1);
1022 if (ether->rxirq < 0) {
1023 dev_err(&pdev->dev, "failed to get ether rx irq\n");
1024 error = -ENXIO;
1025 goto failed_free_txirq;
1026 }
1027
1028 platform_set_drvdata(pdev, dev);
1029
1030 ether->clk = clk_get(&pdev->dev, NULL);
1031 if (IS_ERR(ether->clk)) {
1032 dev_err(&pdev->dev, "failed to get ether clock\n");
1033 error = PTR_ERR(ether->clk);
1034 goto failed_free_rxirq;
1035 }
1036
1037 ether->rmiiclk = clk_get(&pdev->dev, "RMII");
1038 if (IS_ERR(ether->rmiiclk)) {
1039 dev_err(&pdev->dev, "failed to get ether clock\n");
1040 error = PTR_ERR(ether->rmiiclk);
1041 goto failed_put_clk;
1042 }
1043
1044 ether->pdev = pdev;
1045
1046 w90p910_ether_setup(dev);
1047
1048 error = register_netdev(dev);
1049 if (error != 0) {
1050 dev_err(&pdev->dev, "Regiter EMC w90p910 FAILED\n");
1051 error = -ENODEV;
1052 goto failed_put_rmiiclk;
1053 }
1054
1055 return 0;
1056 failed_put_rmiiclk:
1057 clk_put(ether->rmiiclk);
1058 failed_put_clk:
1059 clk_put(ether->clk);
1060 failed_free_rxirq:
1061 free_irq(ether->rxirq, pdev);
1062 platform_set_drvdata(pdev, NULL);
1063 failed_free_txirq:
1064 free_irq(ether->txirq, pdev);
1065 failed_free_io:
1066 iounmap(ether->reg);
1067 failed_free_mem:
1068 release_mem_region(ether->res->start, resource_size(ether->res));
1069 failed_free:
1070 free_netdev(dev);
1071 return error;
1072 }
1073
1074 static int __devexit w90p910_ether_remove(struct platform_device *pdev)
1075 {
1076 struct net_device *dev = platform_get_drvdata(pdev);
1077 struct w90p910_ether *ether = netdev_priv(dev);
1078
1079 unregister_netdev(dev);
1080
1081 clk_put(ether->rmiiclk);
1082 clk_put(ether->clk);
1083
1084 iounmap(ether->reg);
1085 release_mem_region(ether->res->start, resource_size(ether->res));
1086
1087 free_irq(ether->txirq, dev);
1088 free_irq(ether->rxirq, dev);
1089
1090 del_timer_sync(&ether->check_timer);
1091 platform_set_drvdata(pdev, NULL);
1092
1093 free_netdev(dev);
1094 return 0;
1095 }
1096
1097 static struct platform_driver w90p910_ether_driver = {
1098 .probe = w90p910_ether_probe,
1099 .remove = __devexit_p(w90p910_ether_remove),
1100 .driver = {
1101 .name = "nuc900-emc",
1102 .owner = THIS_MODULE,
1103 },
1104 };
1105
1106 module_platform_driver(w90p910_ether_driver);
1107
1108 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
1109 MODULE_DESCRIPTION("w90p910 MAC driver!");
1110 MODULE_LICENSE("GPL");
1111 MODULE_ALIAS("platform:nuc900-emc");
1112