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Merge branch 'clk-fixes' into clk-next
[deliverable/linux.git] / drivers / net / ethernet / cirrus / ep93xx_eth.c
1 /*
2 * EP93xx ethernet network device driver
3 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
4 * Dedicated to Marija Kulikova.
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; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
13
14 #include <linux/dma-mapping.h>
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/netdevice.h>
18 #include <linux/mii.h>
19 #include <linux/etherdevice.h>
20 #include <linux/ethtool.h>
21 #include <linux/interrupt.h>
22 #include <linux/moduleparam.h>
23 #include <linux/platform_device.h>
24 #include <linux/delay.h>
25 #include <linux/io.h>
26 #include <linux/slab.h>
27
28 #include <mach/hardware.h>
29
30 #define DRV_MODULE_NAME "ep93xx-eth"
31 #define DRV_MODULE_VERSION "0.1"
32
33 #define RX_QUEUE_ENTRIES 64
34 #define TX_QUEUE_ENTRIES 8
35
36 #define MAX_PKT_SIZE 2044
37 #define PKT_BUF_SIZE 2048
38
39 #define REG_RXCTL 0x0000
40 #define REG_RXCTL_DEFAULT 0x00073800
41 #define REG_TXCTL 0x0004
42 #define REG_TXCTL_ENABLE 0x00000001
43 #define REG_MIICMD 0x0010
44 #define REG_MIICMD_READ 0x00008000
45 #define REG_MIICMD_WRITE 0x00004000
46 #define REG_MIIDATA 0x0014
47 #define REG_MIISTS 0x0018
48 #define REG_MIISTS_BUSY 0x00000001
49 #define REG_SELFCTL 0x0020
50 #define REG_SELFCTL_RESET 0x00000001
51 #define REG_INTEN 0x0024
52 #define REG_INTEN_TX 0x00000008
53 #define REG_INTEN_RX 0x00000007
54 #define REG_INTSTSP 0x0028
55 #define REG_INTSTS_TX 0x00000008
56 #define REG_INTSTS_RX 0x00000004
57 #define REG_INTSTSC 0x002c
58 #define REG_AFP 0x004c
59 #define REG_INDAD0 0x0050
60 #define REG_INDAD1 0x0051
61 #define REG_INDAD2 0x0052
62 #define REG_INDAD3 0x0053
63 #define REG_INDAD4 0x0054
64 #define REG_INDAD5 0x0055
65 #define REG_GIINTMSK 0x0064
66 #define REG_GIINTMSK_ENABLE 0x00008000
67 #define REG_BMCTL 0x0080
68 #define REG_BMCTL_ENABLE_TX 0x00000100
69 #define REG_BMCTL_ENABLE_RX 0x00000001
70 #define REG_BMSTS 0x0084
71 #define REG_BMSTS_RX_ACTIVE 0x00000008
72 #define REG_RXDQBADD 0x0090
73 #define REG_RXDQBLEN 0x0094
74 #define REG_RXDCURADD 0x0098
75 #define REG_RXDENQ 0x009c
76 #define REG_RXSTSQBADD 0x00a0
77 #define REG_RXSTSQBLEN 0x00a4
78 #define REG_RXSTSQCURADD 0x00a8
79 #define REG_RXSTSENQ 0x00ac
80 #define REG_TXDQBADD 0x00b0
81 #define REG_TXDQBLEN 0x00b4
82 #define REG_TXDQCURADD 0x00b8
83 #define REG_TXDENQ 0x00bc
84 #define REG_TXSTSQBADD 0x00c0
85 #define REG_TXSTSQBLEN 0x00c4
86 #define REG_TXSTSQCURADD 0x00c8
87 #define REG_MAXFRMLEN 0x00e8
88
89 struct ep93xx_rdesc
90 {
91 u32 buf_addr;
92 u32 rdesc1;
93 };
94
95 #define RDESC1_NSOF 0x80000000
96 #define RDESC1_BUFFER_INDEX 0x7fff0000
97 #define RDESC1_BUFFER_LENGTH 0x0000ffff
98
99 struct ep93xx_rstat
100 {
101 u32 rstat0;
102 u32 rstat1;
103 };
104
105 #define RSTAT0_RFP 0x80000000
106 #define RSTAT0_RWE 0x40000000
107 #define RSTAT0_EOF 0x20000000
108 #define RSTAT0_EOB 0x10000000
109 #define RSTAT0_AM 0x00c00000
110 #define RSTAT0_RX_ERR 0x00200000
111 #define RSTAT0_OE 0x00100000
112 #define RSTAT0_FE 0x00080000
113 #define RSTAT0_RUNT 0x00040000
114 #define RSTAT0_EDATA 0x00020000
115 #define RSTAT0_CRCE 0x00010000
116 #define RSTAT0_CRCI 0x00008000
117 #define RSTAT0_HTI 0x00003f00
118 #define RSTAT1_RFP 0x80000000
119 #define RSTAT1_BUFFER_INDEX 0x7fff0000
120 #define RSTAT1_FRAME_LENGTH 0x0000ffff
121
122 struct ep93xx_tdesc
123 {
124 u32 buf_addr;
125 u32 tdesc1;
126 };
127
128 #define TDESC1_EOF 0x80000000
129 #define TDESC1_BUFFER_INDEX 0x7fff0000
130 #define TDESC1_BUFFER_ABORT 0x00008000
131 #define TDESC1_BUFFER_LENGTH 0x00000fff
132
133 struct ep93xx_tstat
134 {
135 u32 tstat0;
136 };
137
138 #define TSTAT0_TXFP 0x80000000
139 #define TSTAT0_TXWE 0x40000000
140 #define TSTAT0_FA 0x20000000
141 #define TSTAT0_LCRS 0x10000000
142 #define TSTAT0_OW 0x04000000
143 #define TSTAT0_TXU 0x02000000
144 #define TSTAT0_ECOLL 0x01000000
145 #define TSTAT0_NCOLL 0x001f0000
146 #define TSTAT0_BUFFER_INDEX 0x00007fff
147
148 struct ep93xx_descs
149 {
150 struct ep93xx_rdesc rdesc[RX_QUEUE_ENTRIES];
151 struct ep93xx_tdesc tdesc[TX_QUEUE_ENTRIES];
152 struct ep93xx_rstat rstat[RX_QUEUE_ENTRIES];
153 struct ep93xx_tstat tstat[TX_QUEUE_ENTRIES];
154 };
155
156 struct ep93xx_priv
157 {
158 struct resource *res;
159 void __iomem *base_addr;
160 int irq;
161
162 struct ep93xx_descs *descs;
163 dma_addr_t descs_dma_addr;
164
165 void *rx_buf[RX_QUEUE_ENTRIES];
166 void *tx_buf[TX_QUEUE_ENTRIES];
167
168 spinlock_t rx_lock;
169 unsigned int rx_pointer;
170 unsigned int tx_clean_pointer;
171 unsigned int tx_pointer;
172 spinlock_t tx_pending_lock;
173 unsigned int tx_pending;
174
175 struct net_device *dev;
176 struct napi_struct napi;
177
178 struct mii_if_info mii;
179 u8 mdc_divisor;
180 };
181
182 #define rdb(ep, off) __raw_readb((ep)->base_addr + (off))
183 #define rdw(ep, off) __raw_readw((ep)->base_addr + (off))
184 #define rdl(ep, off) __raw_readl((ep)->base_addr + (off))
185 #define wrb(ep, off, val) __raw_writeb((val), (ep)->base_addr + (off))
186 #define wrw(ep, off, val) __raw_writew((val), (ep)->base_addr + (off))
187 #define wrl(ep, off, val) __raw_writel((val), (ep)->base_addr + (off))
188
189 static int ep93xx_mdio_read(struct net_device *dev, int phy_id, int reg)
190 {
191 struct ep93xx_priv *ep = netdev_priv(dev);
192 int data;
193 int i;
194
195 wrl(ep, REG_MIICMD, REG_MIICMD_READ | (phy_id << 5) | reg);
196
197 for (i = 0; i < 10; i++) {
198 if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
199 break;
200 msleep(1);
201 }
202
203 if (i == 10) {
204 pr_info("mdio read timed out\n");
205 data = 0xffff;
206 } else {
207 data = rdl(ep, REG_MIIDATA);
208 }
209
210 return data;
211 }
212
213 static void ep93xx_mdio_write(struct net_device *dev, int phy_id, int reg, int data)
214 {
215 struct ep93xx_priv *ep = netdev_priv(dev);
216 int i;
217
218 wrl(ep, REG_MIIDATA, data);
219 wrl(ep, REG_MIICMD, REG_MIICMD_WRITE | (phy_id << 5) | reg);
220
221 for (i = 0; i < 10; i++) {
222 if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
223 break;
224 msleep(1);
225 }
226
227 if (i == 10)
228 pr_info("mdio write timed out\n");
229 }
230
231 static int ep93xx_rx(struct net_device *dev, int processed, int budget)
232 {
233 struct ep93xx_priv *ep = netdev_priv(dev);
234
235 while (processed < budget) {
236 int entry;
237 struct ep93xx_rstat *rstat;
238 u32 rstat0;
239 u32 rstat1;
240 int length;
241 struct sk_buff *skb;
242
243 entry = ep->rx_pointer;
244 rstat = ep->descs->rstat + entry;
245
246 rstat0 = rstat->rstat0;
247 rstat1 = rstat->rstat1;
248 if (!(rstat0 & RSTAT0_RFP) || !(rstat1 & RSTAT1_RFP))
249 break;
250
251 rstat->rstat0 = 0;
252 rstat->rstat1 = 0;
253
254 if (!(rstat0 & RSTAT0_EOF))
255 pr_crit("not end-of-frame %.8x %.8x\n", rstat0, rstat1);
256 if (!(rstat0 & RSTAT0_EOB))
257 pr_crit("not end-of-buffer %.8x %.8x\n", rstat0, rstat1);
258 if ((rstat1 & RSTAT1_BUFFER_INDEX) >> 16 != entry)
259 pr_crit("entry mismatch %.8x %.8x\n", rstat0, rstat1);
260
261 if (!(rstat0 & RSTAT0_RWE)) {
262 dev->stats.rx_errors++;
263 if (rstat0 & RSTAT0_OE)
264 dev->stats.rx_fifo_errors++;
265 if (rstat0 & RSTAT0_FE)
266 dev->stats.rx_frame_errors++;
267 if (rstat0 & (RSTAT0_RUNT | RSTAT0_EDATA))
268 dev->stats.rx_length_errors++;
269 if (rstat0 & RSTAT0_CRCE)
270 dev->stats.rx_crc_errors++;
271 goto err;
272 }
273
274 length = rstat1 & RSTAT1_FRAME_LENGTH;
275 if (length > MAX_PKT_SIZE) {
276 pr_notice("invalid length %.8x %.8x\n", rstat0, rstat1);
277 goto err;
278 }
279
280 /* Strip FCS. */
281 if (rstat0 & RSTAT0_CRCI)
282 length -= 4;
283
284 skb = netdev_alloc_skb(dev, length + 2);
285 if (likely(skb != NULL)) {
286 struct ep93xx_rdesc *rxd = &ep->descs->rdesc[entry];
287 skb_reserve(skb, 2);
288 dma_sync_single_for_cpu(dev->dev.parent, rxd->buf_addr,
289 length, DMA_FROM_DEVICE);
290 skb_copy_to_linear_data(skb, ep->rx_buf[entry], length);
291 dma_sync_single_for_device(dev->dev.parent,
292 rxd->buf_addr, length,
293 DMA_FROM_DEVICE);
294 skb_put(skb, length);
295 skb->protocol = eth_type_trans(skb, dev);
296
297 netif_receive_skb(skb);
298
299 dev->stats.rx_packets++;
300 dev->stats.rx_bytes += length;
301 } else {
302 dev->stats.rx_dropped++;
303 }
304
305 err:
306 ep->rx_pointer = (entry + 1) & (RX_QUEUE_ENTRIES - 1);
307 processed++;
308 }
309
310 return processed;
311 }
312
313 static int ep93xx_have_more_rx(struct ep93xx_priv *ep)
314 {
315 struct ep93xx_rstat *rstat = ep->descs->rstat + ep->rx_pointer;
316 return !!((rstat->rstat0 & RSTAT0_RFP) && (rstat->rstat1 & RSTAT1_RFP));
317 }
318
319 static int ep93xx_poll(struct napi_struct *napi, int budget)
320 {
321 struct ep93xx_priv *ep = container_of(napi, struct ep93xx_priv, napi);
322 struct net_device *dev = ep->dev;
323 int rx = 0;
324
325 poll_some_more:
326 rx = ep93xx_rx(dev, rx, budget);
327 if (rx < budget) {
328 int more = 0;
329
330 spin_lock_irq(&ep->rx_lock);
331 __napi_complete(napi);
332 wrl(ep, REG_INTEN, REG_INTEN_TX | REG_INTEN_RX);
333 if (ep93xx_have_more_rx(ep)) {
334 wrl(ep, REG_INTEN, REG_INTEN_TX);
335 wrl(ep, REG_INTSTSP, REG_INTSTS_RX);
336 more = 1;
337 }
338 spin_unlock_irq(&ep->rx_lock);
339
340 if (more && napi_reschedule(napi))
341 goto poll_some_more;
342 }
343
344 if (rx) {
345 wrw(ep, REG_RXDENQ, rx);
346 wrw(ep, REG_RXSTSENQ, rx);
347 }
348
349 return rx;
350 }
351
352 static int ep93xx_xmit(struct sk_buff *skb, struct net_device *dev)
353 {
354 struct ep93xx_priv *ep = netdev_priv(dev);
355 struct ep93xx_tdesc *txd;
356 int entry;
357
358 if (unlikely(skb->len > MAX_PKT_SIZE)) {
359 dev->stats.tx_dropped++;
360 dev_kfree_skb(skb);
361 return NETDEV_TX_OK;
362 }
363
364 entry = ep->tx_pointer;
365 ep->tx_pointer = (ep->tx_pointer + 1) & (TX_QUEUE_ENTRIES - 1);
366
367 txd = &ep->descs->tdesc[entry];
368
369 txd->tdesc1 = TDESC1_EOF | (entry << 16) | (skb->len & 0xfff);
370 dma_sync_single_for_cpu(dev->dev.parent, txd->buf_addr, skb->len,
371 DMA_TO_DEVICE);
372 skb_copy_and_csum_dev(skb, ep->tx_buf[entry]);
373 dma_sync_single_for_device(dev->dev.parent, txd->buf_addr, skb->len,
374 DMA_TO_DEVICE);
375 dev_kfree_skb(skb);
376
377 spin_lock_irq(&ep->tx_pending_lock);
378 ep->tx_pending++;
379 if (ep->tx_pending == TX_QUEUE_ENTRIES)
380 netif_stop_queue(dev);
381 spin_unlock_irq(&ep->tx_pending_lock);
382
383 wrl(ep, REG_TXDENQ, 1);
384
385 return NETDEV_TX_OK;
386 }
387
388 static void ep93xx_tx_complete(struct net_device *dev)
389 {
390 struct ep93xx_priv *ep = netdev_priv(dev);
391 int wake;
392
393 wake = 0;
394
395 spin_lock(&ep->tx_pending_lock);
396 while (1) {
397 int entry;
398 struct ep93xx_tstat *tstat;
399 u32 tstat0;
400
401 entry = ep->tx_clean_pointer;
402 tstat = ep->descs->tstat + entry;
403
404 tstat0 = tstat->tstat0;
405 if (!(tstat0 & TSTAT0_TXFP))
406 break;
407
408 tstat->tstat0 = 0;
409
410 if (tstat0 & TSTAT0_FA)
411 pr_crit("frame aborted %.8x\n", tstat0);
412 if ((tstat0 & TSTAT0_BUFFER_INDEX) != entry)
413 pr_crit("entry mismatch %.8x\n", tstat0);
414
415 if (tstat0 & TSTAT0_TXWE) {
416 int length = ep->descs->tdesc[entry].tdesc1 & 0xfff;
417
418 dev->stats.tx_packets++;
419 dev->stats.tx_bytes += length;
420 } else {
421 dev->stats.tx_errors++;
422 }
423
424 if (tstat0 & TSTAT0_OW)
425 dev->stats.tx_window_errors++;
426 if (tstat0 & TSTAT0_TXU)
427 dev->stats.tx_fifo_errors++;
428 dev->stats.collisions += (tstat0 >> 16) & 0x1f;
429
430 ep->tx_clean_pointer = (entry + 1) & (TX_QUEUE_ENTRIES - 1);
431 if (ep->tx_pending == TX_QUEUE_ENTRIES)
432 wake = 1;
433 ep->tx_pending--;
434 }
435 spin_unlock(&ep->tx_pending_lock);
436
437 if (wake)
438 netif_wake_queue(dev);
439 }
440
441 static irqreturn_t ep93xx_irq(int irq, void *dev_id)
442 {
443 struct net_device *dev = dev_id;
444 struct ep93xx_priv *ep = netdev_priv(dev);
445 u32 status;
446
447 status = rdl(ep, REG_INTSTSC);
448 if (status == 0)
449 return IRQ_NONE;
450
451 if (status & REG_INTSTS_RX) {
452 spin_lock(&ep->rx_lock);
453 if (likely(napi_schedule_prep(&ep->napi))) {
454 wrl(ep, REG_INTEN, REG_INTEN_TX);
455 __napi_schedule(&ep->napi);
456 }
457 spin_unlock(&ep->rx_lock);
458 }
459
460 if (status & REG_INTSTS_TX)
461 ep93xx_tx_complete(dev);
462
463 return IRQ_HANDLED;
464 }
465
466 static void ep93xx_free_buffers(struct ep93xx_priv *ep)
467 {
468 struct device *dev = ep->dev->dev.parent;
469 int i;
470
471 for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
472 dma_addr_t d;
473
474 d = ep->descs->rdesc[i].buf_addr;
475 if (d)
476 dma_unmap_single(dev, d, PKT_BUF_SIZE, DMA_FROM_DEVICE);
477
478 kfree(ep->rx_buf[i]);
479 }
480
481 for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
482 dma_addr_t d;
483
484 d = ep->descs->tdesc[i].buf_addr;
485 if (d)
486 dma_unmap_single(dev, d, PKT_BUF_SIZE, DMA_TO_DEVICE);
487
488 kfree(ep->tx_buf[i]);
489 }
490
491 dma_free_coherent(dev, sizeof(struct ep93xx_descs), ep->descs,
492 ep->descs_dma_addr);
493 }
494
495 static int ep93xx_alloc_buffers(struct ep93xx_priv *ep)
496 {
497 struct device *dev = ep->dev->dev.parent;
498 int i;
499
500 ep->descs = dma_alloc_coherent(dev, sizeof(struct ep93xx_descs),
501 &ep->descs_dma_addr, GFP_KERNEL);
502 if (ep->descs == NULL)
503 return 1;
504
505 for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
506 void *buf;
507 dma_addr_t d;
508
509 buf = kmalloc(PKT_BUF_SIZE, GFP_KERNEL);
510 if (buf == NULL)
511 goto err;
512
513 d = dma_map_single(dev, buf, PKT_BUF_SIZE, DMA_FROM_DEVICE);
514 if (dma_mapping_error(dev, d)) {
515 kfree(buf);
516 goto err;
517 }
518
519 ep->rx_buf[i] = buf;
520 ep->descs->rdesc[i].buf_addr = d;
521 ep->descs->rdesc[i].rdesc1 = (i << 16) | PKT_BUF_SIZE;
522 }
523
524 for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
525 void *buf;
526 dma_addr_t d;
527
528 buf = kmalloc(PKT_BUF_SIZE, GFP_KERNEL);
529 if (buf == NULL)
530 goto err;
531
532 d = dma_map_single(dev, buf, PKT_BUF_SIZE, DMA_TO_DEVICE);
533 if (dma_mapping_error(dev, d)) {
534 kfree(buf);
535 goto err;
536 }
537
538 ep->tx_buf[i] = buf;
539 ep->descs->tdesc[i].buf_addr = d;
540 }
541
542 return 0;
543
544 err:
545 ep93xx_free_buffers(ep);
546 return 1;
547 }
548
549 static int ep93xx_start_hw(struct net_device *dev)
550 {
551 struct ep93xx_priv *ep = netdev_priv(dev);
552 unsigned long addr;
553 int i;
554
555 wrl(ep, REG_SELFCTL, REG_SELFCTL_RESET);
556 for (i = 0; i < 10; i++) {
557 if ((rdl(ep, REG_SELFCTL) & REG_SELFCTL_RESET) == 0)
558 break;
559 msleep(1);
560 }
561
562 if (i == 10) {
563 pr_crit("hw failed to reset\n");
564 return 1;
565 }
566
567 wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9));
568
569 /* Does the PHY support preamble suppress? */
570 if ((ep93xx_mdio_read(dev, ep->mii.phy_id, MII_BMSR) & 0x0040) != 0)
571 wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9) | (1 << 8));
572
573 /* Receive descriptor ring. */
574 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rdesc);
575 wrl(ep, REG_RXDQBADD, addr);
576 wrl(ep, REG_RXDCURADD, addr);
577 wrw(ep, REG_RXDQBLEN, RX_QUEUE_ENTRIES * sizeof(struct ep93xx_rdesc));
578
579 /* Receive status ring. */
580 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rstat);
581 wrl(ep, REG_RXSTSQBADD, addr);
582 wrl(ep, REG_RXSTSQCURADD, addr);
583 wrw(ep, REG_RXSTSQBLEN, RX_QUEUE_ENTRIES * sizeof(struct ep93xx_rstat));
584
585 /* Transmit descriptor ring. */
586 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, tdesc);
587 wrl(ep, REG_TXDQBADD, addr);
588 wrl(ep, REG_TXDQCURADD, addr);
589 wrw(ep, REG_TXDQBLEN, TX_QUEUE_ENTRIES * sizeof(struct ep93xx_tdesc));
590
591 /* Transmit status ring. */
592 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, tstat);
593 wrl(ep, REG_TXSTSQBADD, addr);
594 wrl(ep, REG_TXSTSQCURADD, addr);
595 wrw(ep, REG_TXSTSQBLEN, TX_QUEUE_ENTRIES * sizeof(struct ep93xx_tstat));
596
597 wrl(ep, REG_BMCTL, REG_BMCTL_ENABLE_TX | REG_BMCTL_ENABLE_RX);
598 wrl(ep, REG_INTEN, REG_INTEN_TX | REG_INTEN_RX);
599 wrl(ep, REG_GIINTMSK, 0);
600
601 for (i = 0; i < 10; i++) {
602 if ((rdl(ep, REG_BMSTS) & REG_BMSTS_RX_ACTIVE) != 0)
603 break;
604 msleep(1);
605 }
606
607 if (i == 10) {
608 pr_crit("hw failed to start\n");
609 return 1;
610 }
611
612 wrl(ep, REG_RXDENQ, RX_QUEUE_ENTRIES);
613 wrl(ep, REG_RXSTSENQ, RX_QUEUE_ENTRIES);
614
615 wrb(ep, REG_INDAD0, dev->dev_addr[0]);
616 wrb(ep, REG_INDAD1, dev->dev_addr[1]);
617 wrb(ep, REG_INDAD2, dev->dev_addr[2]);
618 wrb(ep, REG_INDAD3, dev->dev_addr[3]);
619 wrb(ep, REG_INDAD4, dev->dev_addr[4]);
620 wrb(ep, REG_INDAD5, dev->dev_addr[5]);
621 wrl(ep, REG_AFP, 0);
622
623 wrl(ep, REG_MAXFRMLEN, (MAX_PKT_SIZE << 16) | MAX_PKT_SIZE);
624
625 wrl(ep, REG_RXCTL, REG_RXCTL_DEFAULT);
626 wrl(ep, REG_TXCTL, REG_TXCTL_ENABLE);
627
628 return 0;
629 }
630
631 static void ep93xx_stop_hw(struct net_device *dev)
632 {
633 struct ep93xx_priv *ep = netdev_priv(dev);
634 int i;
635
636 wrl(ep, REG_SELFCTL, REG_SELFCTL_RESET);
637 for (i = 0; i < 10; i++) {
638 if ((rdl(ep, REG_SELFCTL) & REG_SELFCTL_RESET) == 0)
639 break;
640 msleep(1);
641 }
642
643 if (i == 10)
644 pr_crit("hw failed to reset\n");
645 }
646
647 static int ep93xx_open(struct net_device *dev)
648 {
649 struct ep93xx_priv *ep = netdev_priv(dev);
650 int err;
651
652 if (ep93xx_alloc_buffers(ep))
653 return -ENOMEM;
654
655 napi_enable(&ep->napi);
656
657 if (ep93xx_start_hw(dev)) {
658 napi_disable(&ep->napi);
659 ep93xx_free_buffers(ep);
660 return -EIO;
661 }
662
663 spin_lock_init(&ep->rx_lock);
664 ep->rx_pointer = 0;
665 ep->tx_clean_pointer = 0;
666 ep->tx_pointer = 0;
667 spin_lock_init(&ep->tx_pending_lock);
668 ep->tx_pending = 0;
669
670 err = request_irq(ep->irq, ep93xx_irq, IRQF_SHARED, dev->name, dev);
671 if (err) {
672 napi_disable(&ep->napi);
673 ep93xx_stop_hw(dev);
674 ep93xx_free_buffers(ep);
675 return err;
676 }
677
678 wrl(ep, REG_GIINTMSK, REG_GIINTMSK_ENABLE);
679
680 netif_start_queue(dev);
681
682 return 0;
683 }
684
685 static int ep93xx_close(struct net_device *dev)
686 {
687 struct ep93xx_priv *ep = netdev_priv(dev);
688
689 napi_disable(&ep->napi);
690 netif_stop_queue(dev);
691
692 wrl(ep, REG_GIINTMSK, 0);
693 free_irq(ep->irq, dev);
694 ep93xx_stop_hw(dev);
695 ep93xx_free_buffers(ep);
696
697 return 0;
698 }
699
700 static int ep93xx_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
701 {
702 struct ep93xx_priv *ep = netdev_priv(dev);
703 struct mii_ioctl_data *data = if_mii(ifr);
704
705 return generic_mii_ioctl(&ep->mii, data, cmd, NULL);
706 }
707
708 static void ep93xx_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
709 {
710 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
711 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
712 }
713
714 static int ep93xx_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
715 {
716 struct ep93xx_priv *ep = netdev_priv(dev);
717 return mii_ethtool_gset(&ep->mii, cmd);
718 }
719
720 static int ep93xx_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
721 {
722 struct ep93xx_priv *ep = netdev_priv(dev);
723 return mii_ethtool_sset(&ep->mii, cmd);
724 }
725
726 static int ep93xx_nway_reset(struct net_device *dev)
727 {
728 struct ep93xx_priv *ep = netdev_priv(dev);
729 return mii_nway_restart(&ep->mii);
730 }
731
732 static u32 ep93xx_get_link(struct net_device *dev)
733 {
734 struct ep93xx_priv *ep = netdev_priv(dev);
735 return mii_link_ok(&ep->mii);
736 }
737
738 static const struct ethtool_ops ep93xx_ethtool_ops = {
739 .get_drvinfo = ep93xx_get_drvinfo,
740 .get_settings = ep93xx_get_settings,
741 .set_settings = ep93xx_set_settings,
742 .nway_reset = ep93xx_nway_reset,
743 .get_link = ep93xx_get_link,
744 };
745
746 static const struct net_device_ops ep93xx_netdev_ops = {
747 .ndo_open = ep93xx_open,
748 .ndo_stop = ep93xx_close,
749 .ndo_start_xmit = ep93xx_xmit,
750 .ndo_do_ioctl = ep93xx_ioctl,
751 .ndo_validate_addr = eth_validate_addr,
752 .ndo_change_mtu = eth_change_mtu,
753 .ndo_set_mac_address = eth_mac_addr,
754 };
755
756 static struct net_device *ep93xx_dev_alloc(struct ep93xx_eth_data *data)
757 {
758 struct net_device *dev;
759
760 dev = alloc_etherdev(sizeof(struct ep93xx_priv));
761 if (dev == NULL)
762 return NULL;
763
764 memcpy(dev->dev_addr, data->dev_addr, ETH_ALEN);
765
766 dev->ethtool_ops = &ep93xx_ethtool_ops;
767 dev->netdev_ops = &ep93xx_netdev_ops;
768
769 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
770
771 return dev;
772 }
773
774
775 static int ep93xx_eth_remove(struct platform_device *pdev)
776 {
777 struct net_device *dev;
778 struct ep93xx_priv *ep;
779
780 dev = platform_get_drvdata(pdev);
781 if (dev == NULL)
782 return 0;
783
784 ep = netdev_priv(dev);
785
786 /* @@@ Force down. */
787 unregister_netdev(dev);
788 ep93xx_free_buffers(ep);
789
790 if (ep->base_addr != NULL)
791 iounmap(ep->base_addr);
792
793 if (ep->res != NULL) {
794 release_resource(ep->res);
795 kfree(ep->res);
796 }
797
798 free_netdev(dev);
799
800 return 0;
801 }
802
803 static int ep93xx_eth_probe(struct platform_device *pdev)
804 {
805 struct ep93xx_eth_data *data;
806 struct net_device *dev;
807 struct ep93xx_priv *ep;
808 struct resource *mem;
809 int irq;
810 int err;
811
812 if (pdev == NULL)
813 return -ENODEV;
814 data = dev_get_platdata(&pdev->dev);
815
816 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
817 irq = platform_get_irq(pdev, 0);
818 if (!mem || irq < 0)
819 return -ENXIO;
820
821 dev = ep93xx_dev_alloc(data);
822 if (dev == NULL) {
823 err = -ENOMEM;
824 goto err_out;
825 }
826 ep = netdev_priv(dev);
827 ep->dev = dev;
828 SET_NETDEV_DEV(dev, &pdev->dev);
829 netif_napi_add(dev, &ep->napi, ep93xx_poll, 64);
830
831 platform_set_drvdata(pdev, dev);
832
833 ep->res = request_mem_region(mem->start, resource_size(mem),
834 dev_name(&pdev->dev));
835 if (ep->res == NULL) {
836 dev_err(&pdev->dev, "Could not reserve memory region\n");
837 err = -ENOMEM;
838 goto err_out;
839 }
840
841 ep->base_addr = ioremap(mem->start, resource_size(mem));
842 if (ep->base_addr == NULL) {
843 dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
844 err = -EIO;
845 goto err_out;
846 }
847 ep->irq = irq;
848
849 ep->mii.phy_id = data->phy_id;
850 ep->mii.phy_id_mask = 0x1f;
851 ep->mii.reg_num_mask = 0x1f;
852 ep->mii.dev = dev;
853 ep->mii.mdio_read = ep93xx_mdio_read;
854 ep->mii.mdio_write = ep93xx_mdio_write;
855 ep->mdc_divisor = 40; /* Max HCLK 100 MHz, min MDIO clk 2.5 MHz. */
856
857 if (is_zero_ether_addr(dev->dev_addr))
858 eth_hw_addr_random(dev);
859
860 err = register_netdev(dev);
861 if (err) {
862 dev_err(&pdev->dev, "Failed to register netdev\n");
863 goto err_out;
864 }
865
866 printk(KERN_INFO "%s: ep93xx on-chip ethernet, IRQ %d, %pM\n",
867 dev->name, ep->irq, dev->dev_addr);
868
869 return 0;
870
871 err_out:
872 ep93xx_eth_remove(pdev);
873 return err;
874 }
875
876
877 static struct platform_driver ep93xx_eth_driver = {
878 .probe = ep93xx_eth_probe,
879 .remove = ep93xx_eth_remove,
880 .driver = {
881 .name = "ep93xx-eth",
882 },
883 };
884
885 module_platform_driver(ep93xx_eth_driver);
886
887 MODULE_LICENSE("GPL");
888 MODULE_ALIAS("platform:ep93xx-eth");
Linux kernel - Deliverables
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