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igb: Add device support for flashless SKU of i210 device
[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/init.h>
22 #include <linux/interrupt.h>
23 #include <linux/moduleparam.h>
24 #include <linux/platform_device.h>
25 #include <linux/delay.h>
26 #include <linux/io.h>
27 #include <linux/slab.h>
28
29 #include <mach/hardware.h>
30
31 #define DRV_MODULE_NAME "ep93xx-eth"
32 #define DRV_MODULE_VERSION "0.1"
33
34 #define RX_QUEUE_ENTRIES 64
35 #define TX_QUEUE_ENTRIES 8
36
37 #define MAX_PKT_SIZE 2044
38 #define PKT_BUF_SIZE 2048
39
40 #define REG_RXCTL 0x0000
41 #define REG_RXCTL_DEFAULT 0x00073800
42 #define REG_TXCTL 0x0004
43 #define REG_TXCTL_ENABLE 0x00000001
44 #define REG_MIICMD 0x0010
45 #define REG_MIICMD_READ 0x00008000
46 #define REG_MIICMD_WRITE 0x00004000
47 #define REG_MIIDATA 0x0014
48 #define REG_MIISTS 0x0018
49 #define REG_MIISTS_BUSY 0x00000001
50 #define REG_SELFCTL 0x0020
51 #define REG_SELFCTL_RESET 0x00000001
52 #define REG_INTEN 0x0024
53 #define REG_INTEN_TX 0x00000008
54 #define REG_INTEN_RX 0x00000007
55 #define REG_INTSTSP 0x0028
56 #define REG_INTSTS_TX 0x00000008
57 #define REG_INTSTS_RX 0x00000004
58 #define REG_INTSTSC 0x002c
59 #define REG_AFP 0x004c
60 #define REG_INDAD0 0x0050
61 #define REG_INDAD1 0x0051
62 #define REG_INDAD2 0x0052
63 #define REG_INDAD3 0x0053
64 #define REG_INDAD4 0x0054
65 #define REG_INDAD5 0x0055
66 #define REG_GIINTMSK 0x0064
67 #define REG_GIINTMSK_ENABLE 0x00008000
68 #define REG_BMCTL 0x0080
69 #define REG_BMCTL_ENABLE_TX 0x00000100
70 #define REG_BMCTL_ENABLE_RX 0x00000001
71 #define REG_BMSTS 0x0084
72 #define REG_BMSTS_RX_ACTIVE 0x00000008
73 #define REG_RXDQBADD 0x0090
74 #define REG_RXDQBLEN 0x0094
75 #define REG_RXDCURADD 0x0098
76 #define REG_RXDENQ 0x009c
77 #define REG_RXSTSQBADD 0x00a0
78 #define REG_RXSTSQBLEN 0x00a4
79 #define REG_RXSTSQCURADD 0x00a8
80 #define REG_RXSTSENQ 0x00ac
81 #define REG_TXDQBADD 0x00b0
82 #define REG_TXDQBLEN 0x00b4
83 #define REG_TXDQCURADD 0x00b8
84 #define REG_TXDENQ 0x00bc
85 #define REG_TXSTSQBADD 0x00c0
86 #define REG_TXSTSQBLEN 0x00c4
87 #define REG_TXSTSQCURADD 0x00c8
88 #define REG_MAXFRMLEN 0x00e8
89
90 struct ep93xx_rdesc
91 {
92 u32 buf_addr;
93 u32 rdesc1;
94 };
95
96 #define RDESC1_NSOF 0x80000000
97 #define RDESC1_BUFFER_INDEX 0x7fff0000
98 #define RDESC1_BUFFER_LENGTH 0x0000ffff
99
100 struct ep93xx_rstat
101 {
102 u32 rstat0;
103 u32 rstat1;
104 };
105
106 #define RSTAT0_RFP 0x80000000
107 #define RSTAT0_RWE 0x40000000
108 #define RSTAT0_EOF 0x20000000
109 #define RSTAT0_EOB 0x10000000
110 #define RSTAT0_AM 0x00c00000
111 #define RSTAT0_RX_ERR 0x00200000
112 #define RSTAT0_OE 0x00100000
113 #define RSTAT0_FE 0x00080000
114 #define RSTAT0_RUNT 0x00040000
115 #define RSTAT0_EDATA 0x00020000
116 #define RSTAT0_CRCE 0x00010000
117 #define RSTAT0_CRCI 0x00008000
118 #define RSTAT0_HTI 0x00003f00
119 #define RSTAT1_RFP 0x80000000
120 #define RSTAT1_BUFFER_INDEX 0x7fff0000
121 #define RSTAT1_FRAME_LENGTH 0x0000ffff
122
123 struct ep93xx_tdesc
124 {
125 u32 buf_addr;
126 u32 tdesc1;
127 };
128
129 #define TDESC1_EOF 0x80000000
130 #define TDESC1_BUFFER_INDEX 0x7fff0000
131 #define TDESC1_BUFFER_ABORT 0x00008000
132 #define TDESC1_BUFFER_LENGTH 0x00000fff
133
134 struct ep93xx_tstat
135 {
136 u32 tstat0;
137 };
138
139 #define TSTAT0_TXFP 0x80000000
140 #define TSTAT0_TXWE 0x40000000
141 #define TSTAT0_FA 0x20000000
142 #define TSTAT0_LCRS 0x10000000
143 #define TSTAT0_OW 0x04000000
144 #define TSTAT0_TXU 0x02000000
145 #define TSTAT0_ECOLL 0x01000000
146 #define TSTAT0_NCOLL 0x001f0000
147 #define TSTAT0_BUFFER_INDEX 0x00007fff
148
149 struct ep93xx_descs
150 {
151 struct ep93xx_rdesc rdesc[RX_QUEUE_ENTRIES];
152 struct ep93xx_tdesc tdesc[TX_QUEUE_ENTRIES];
153 struct ep93xx_rstat rstat[RX_QUEUE_ENTRIES];
154 struct ep93xx_tstat tstat[TX_QUEUE_ENTRIES];
155 };
156
157 struct ep93xx_priv
158 {
159 struct resource *res;
160 void __iomem *base_addr;
161 int irq;
162
163 struct ep93xx_descs *descs;
164 dma_addr_t descs_dma_addr;
165
166 void *rx_buf[RX_QUEUE_ENTRIES];
167 void *tx_buf[TX_QUEUE_ENTRIES];
168
169 spinlock_t rx_lock;
170 unsigned int rx_pointer;
171 unsigned int tx_clean_pointer;
172 unsigned int tx_pointer;
173 spinlock_t tx_pending_lock;
174 unsigned int tx_pending;
175
176 struct net_device *dev;
177 struct napi_struct napi;
178
179 struct mii_if_info mii;
180 u8 mdc_divisor;
181 };
182
183 #define rdb(ep, off) __raw_readb((ep)->base_addr + (off))
184 #define rdw(ep, off) __raw_readw((ep)->base_addr + (off))
185 #define rdl(ep, off) __raw_readl((ep)->base_addr + (off))
186 #define wrb(ep, off, val) __raw_writeb((val), (ep)->base_addr + (off))
187 #define wrw(ep, off, val) __raw_writew((val), (ep)->base_addr + (off))
188 #define wrl(ep, off, val) __raw_writel((val), (ep)->base_addr + (off))
189
190 static int ep93xx_mdio_read(struct net_device *dev, int phy_id, int reg)
191 {
192 struct ep93xx_priv *ep = netdev_priv(dev);
193 int data;
194 int i;
195
196 wrl(ep, REG_MIICMD, REG_MIICMD_READ | (phy_id << 5) | reg);
197
198 for (i = 0; i < 10; i++) {
199 if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
200 break;
201 msleep(1);
202 }
203
204 if (i == 10) {
205 pr_info("mdio read timed out\n");
206 data = 0xffff;
207 } else {
208 data = rdl(ep, REG_MIIDATA);
209 }
210
211 return data;
212 }
213
214 static void ep93xx_mdio_write(struct net_device *dev, int phy_id, int reg, int data)
215 {
216 struct ep93xx_priv *ep = netdev_priv(dev);
217 int i;
218
219 wrl(ep, REG_MIIDATA, data);
220 wrl(ep, REG_MIICMD, REG_MIICMD_WRITE | (phy_id << 5) | reg);
221
222 for (i = 0; i < 10; i++) {
223 if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
224 break;
225 msleep(1);
226 }
227
228 if (i == 10)
229 pr_info("mdio write timed out\n");
230 }
231
232 static int ep93xx_rx(struct net_device *dev, int processed, int budget)
233 {
234 struct ep93xx_priv *ep = netdev_priv(dev);
235
236 while (processed < budget) {
237 int entry;
238 struct ep93xx_rstat *rstat;
239 u32 rstat0;
240 u32 rstat1;
241 int length;
242 struct sk_buff *skb;
243
244 entry = ep->rx_pointer;
245 rstat = ep->descs->rstat + entry;
246
247 rstat0 = rstat->rstat0;
248 rstat1 = rstat->rstat1;
249 if (!(rstat0 & RSTAT0_RFP) || !(rstat1 & RSTAT1_RFP))
250 break;
251
252 rstat->rstat0 = 0;
253 rstat->rstat1 = 0;
254
255 if (!(rstat0 & RSTAT0_EOF))
256 pr_crit("not end-of-frame %.8x %.8x\n", rstat0, rstat1);
257 if (!(rstat0 & RSTAT0_EOB))
258 pr_crit("not end-of-buffer %.8x %.8x\n", rstat0, rstat1);
259 if ((rstat1 & RSTAT1_BUFFER_INDEX) >> 16 != entry)
260 pr_crit("entry mismatch %.8x %.8x\n", rstat0, rstat1);
261
262 if (!(rstat0 & RSTAT0_RWE)) {
263 dev->stats.rx_errors++;
264 if (rstat0 & RSTAT0_OE)
265 dev->stats.rx_fifo_errors++;
266 if (rstat0 & RSTAT0_FE)
267 dev->stats.rx_frame_errors++;
268 if (rstat0 & (RSTAT0_RUNT | RSTAT0_EDATA))
269 dev->stats.rx_length_errors++;
270 if (rstat0 & RSTAT0_CRCE)
271 dev->stats.rx_crc_errors++;
272 goto err;
273 }
274
275 length = rstat1 & RSTAT1_FRAME_LENGTH;
276 if (length > MAX_PKT_SIZE) {
277 pr_notice("invalid length %.8x %.8x\n", rstat0, rstat1);
278 goto err;
279 }
280
281 /* Strip FCS. */
282 if (rstat0 & RSTAT0_CRCI)
283 length -= 4;
284
285 skb = netdev_alloc_skb(dev, length + 2);
286 if (likely(skb != NULL)) {
287 struct ep93xx_rdesc *rxd = &ep->descs->rdesc[entry];
288 skb_reserve(skb, 2);
289 dma_sync_single_for_cpu(dev->dev.parent, rxd->buf_addr,
290 length, DMA_FROM_DEVICE);
291 skb_copy_to_linear_data(skb, ep->rx_buf[entry], length);
292 dma_sync_single_for_device(dev->dev.parent,
293 rxd->buf_addr, length,
294 DMA_FROM_DEVICE);
295 skb_put(skb, length);
296 skb->protocol = eth_type_trans(skb, dev);
297
298 netif_receive_skb(skb);
299
300 dev->stats.rx_packets++;
301 dev->stats.rx_bytes += length;
302 } else {
303 dev->stats.rx_dropped++;
304 }
305
306 err:
307 ep->rx_pointer = (entry + 1) & (RX_QUEUE_ENTRIES - 1);
308 processed++;
309 }
310
311 return processed;
312 }
313
314 static int ep93xx_have_more_rx(struct ep93xx_priv *ep)
315 {
316 struct ep93xx_rstat *rstat = ep->descs->rstat + ep->rx_pointer;
317 return !!((rstat->rstat0 & RSTAT0_RFP) && (rstat->rstat1 & RSTAT1_RFP));
318 }
319
320 static int ep93xx_poll(struct napi_struct *napi, int budget)
321 {
322 struct ep93xx_priv *ep = container_of(napi, struct ep93xx_priv, napi);
323 struct net_device *dev = ep->dev;
324 int rx = 0;
325
326 poll_some_more:
327 rx = ep93xx_rx(dev, rx, budget);
328 if (rx < budget) {
329 int more = 0;
330
331 spin_lock_irq(&ep->rx_lock);
332 __napi_complete(napi);
333 wrl(ep, REG_INTEN, REG_INTEN_TX | REG_INTEN_RX);
334 if (ep93xx_have_more_rx(ep)) {
335 wrl(ep, REG_INTEN, REG_INTEN_TX);
336 wrl(ep, REG_INTSTSP, REG_INTSTS_RX);
337 more = 1;
338 }
339 spin_unlock_irq(&ep->rx_lock);
340
341 if (more && napi_reschedule(napi))
342 goto poll_some_more;
343 }
344
345 if (rx) {
346 wrw(ep, REG_RXDENQ, rx);
347 wrw(ep, REG_RXSTSENQ, rx);
348 }
349
350 return rx;
351 }
352
353 static int ep93xx_xmit(struct sk_buff *skb, struct net_device *dev)
354 {
355 struct ep93xx_priv *ep = netdev_priv(dev);
356 struct ep93xx_tdesc *txd;
357 int entry;
358
359 if (unlikely(skb->len > MAX_PKT_SIZE)) {
360 dev->stats.tx_dropped++;
361 dev_kfree_skb(skb);
362 return NETDEV_TX_OK;
363 }
364
365 entry = ep->tx_pointer;
366 ep->tx_pointer = (ep->tx_pointer + 1) & (TX_QUEUE_ENTRIES - 1);
367
368 txd = &ep->descs->tdesc[entry];
369
370 txd->tdesc1 = TDESC1_EOF | (entry << 16) | (skb->len & 0xfff);
371 dma_sync_single_for_cpu(dev->dev.parent, txd->buf_addr, skb->len,
372 DMA_TO_DEVICE);
373 skb_copy_and_csum_dev(skb, ep->tx_buf[entry]);
374 dma_sync_single_for_device(dev->dev.parent, txd->buf_addr, skb->len,
375 DMA_TO_DEVICE);
376 dev_kfree_skb(skb);
377
378 spin_lock_irq(&ep->tx_pending_lock);
379 ep->tx_pending++;
380 if (ep->tx_pending == TX_QUEUE_ENTRIES)
381 netif_stop_queue(dev);
382 spin_unlock_irq(&ep->tx_pending_lock);
383
384 wrl(ep, REG_TXDENQ, 1);
385
386 return NETDEV_TX_OK;
387 }
388
389 static void ep93xx_tx_complete(struct net_device *dev)
390 {
391 struct ep93xx_priv *ep = netdev_priv(dev);
392 int wake;
393
394 wake = 0;
395
396 spin_lock(&ep->tx_pending_lock);
397 while (1) {
398 int entry;
399 struct ep93xx_tstat *tstat;
400 u32 tstat0;
401
402 entry = ep->tx_clean_pointer;
403 tstat = ep->descs->tstat + entry;
404
405 tstat0 = tstat->tstat0;
406 if (!(tstat0 & TSTAT0_TXFP))
407 break;
408
409 tstat->tstat0 = 0;
410
411 if (tstat0 & TSTAT0_FA)
412 pr_crit("frame aborted %.8x\n", tstat0);
413 if ((tstat0 & TSTAT0_BUFFER_INDEX) != entry)
414 pr_crit("entry mismatch %.8x\n", tstat0);
415
416 if (tstat0 & TSTAT0_TXWE) {
417 int length = ep->descs->tdesc[entry].tdesc1 & 0xfff;
418
419 dev->stats.tx_packets++;
420 dev->stats.tx_bytes += length;
421 } else {
422 dev->stats.tx_errors++;
423 }
424
425 if (tstat0 & TSTAT0_OW)
426 dev->stats.tx_window_errors++;
427 if (tstat0 & TSTAT0_TXU)
428 dev->stats.tx_fifo_errors++;
429 dev->stats.collisions += (tstat0 >> 16) & 0x1f;
430
431 ep->tx_clean_pointer = (entry + 1) & (TX_QUEUE_ENTRIES - 1);
432 if (ep->tx_pending == TX_QUEUE_ENTRIES)
433 wake = 1;
434 ep->tx_pending--;
435 }
436 spin_unlock(&ep->tx_pending_lock);
437
438 if (wake)
439 netif_wake_queue(dev);
440 }
441
442 static irqreturn_t ep93xx_irq(int irq, void *dev_id)
443 {
444 struct net_device *dev = dev_id;
445 struct ep93xx_priv *ep = netdev_priv(dev);
446 u32 status;
447
448 status = rdl(ep, REG_INTSTSC);
449 if (status == 0)
450 return IRQ_NONE;
451
452 if (status & REG_INTSTS_RX) {
453 spin_lock(&ep->rx_lock);
454 if (likely(napi_schedule_prep(&ep->napi))) {
455 wrl(ep, REG_INTEN, REG_INTEN_TX);
456 __napi_schedule(&ep->napi);
457 }
458 spin_unlock(&ep->rx_lock);
459 }
460
461 if (status & REG_INTSTS_TX)
462 ep93xx_tx_complete(dev);
463
464 return IRQ_HANDLED;
465 }
466
467 static void ep93xx_free_buffers(struct ep93xx_priv *ep)
468 {
469 struct device *dev = ep->dev->dev.parent;
470 int i;
471
472 for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
473 dma_addr_t d;
474
475 d = ep->descs->rdesc[i].buf_addr;
476 if (d)
477 dma_unmap_single(dev, d, PKT_BUF_SIZE, DMA_FROM_DEVICE);
478
479 if (ep->rx_buf[i] != NULL)
480 kfree(ep->rx_buf[i]);
481 }
482
483 for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
484 dma_addr_t d;
485
486 d = ep->descs->tdesc[i].buf_addr;
487 if (d)
488 dma_unmap_single(dev, d, PKT_BUF_SIZE, DMA_TO_DEVICE);
489
490 if (ep->tx_buf[i] != NULL)
491 kfree(ep->tx_buf[i]);
492 }
493
494 dma_free_coherent(dev, sizeof(struct ep93xx_descs), ep->descs,
495 ep->descs_dma_addr);
496 }
497
498 static int ep93xx_alloc_buffers(struct ep93xx_priv *ep)
499 {
500 struct device *dev = ep->dev->dev.parent;
501 int i;
502
503 ep->descs = dma_alloc_coherent(dev, sizeof(struct ep93xx_descs),
504 &ep->descs_dma_addr, GFP_KERNEL);
505 if (ep->descs == NULL)
506 return 1;
507
508 for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
509 void *buf;
510 dma_addr_t d;
511
512 buf = kmalloc(PKT_BUF_SIZE, GFP_KERNEL);
513 if (buf == NULL)
514 goto err;
515
516 d = dma_map_single(dev, buf, PKT_BUF_SIZE, DMA_FROM_DEVICE);
517 if (dma_mapping_error(dev, d)) {
518 kfree(buf);
519 goto err;
520 }
521
522 ep->rx_buf[i] = buf;
523 ep->descs->rdesc[i].buf_addr = d;
524 ep->descs->rdesc[i].rdesc1 = (i << 16) | PKT_BUF_SIZE;
525 }
526
527 for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
528 void *buf;
529 dma_addr_t d;
530
531 buf = kmalloc(PKT_BUF_SIZE, GFP_KERNEL);
532 if (buf == NULL)
533 goto err;
534
535 d = dma_map_single(dev, buf, PKT_BUF_SIZE, DMA_TO_DEVICE);
536 if (dma_mapping_error(dev, d)) {
537 kfree(buf);
538 goto err;
539 }
540
541 ep->tx_buf[i] = buf;
542 ep->descs->tdesc[i].buf_addr = d;
543 }
544
545 return 0;
546
547 err:
548 ep93xx_free_buffers(ep);
549 return 1;
550 }
551
552 static int ep93xx_start_hw(struct net_device *dev)
553 {
554 struct ep93xx_priv *ep = netdev_priv(dev);
555 unsigned long addr;
556 int i;
557
558 wrl(ep, REG_SELFCTL, REG_SELFCTL_RESET);
559 for (i = 0; i < 10; i++) {
560 if ((rdl(ep, REG_SELFCTL) & REG_SELFCTL_RESET) == 0)
561 break;
562 msleep(1);
563 }
564
565 if (i == 10) {
566 pr_crit("hw failed to reset\n");
567 return 1;
568 }
569
570 wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9));
571
572 /* Does the PHY support preamble suppress? */
573 if ((ep93xx_mdio_read(dev, ep->mii.phy_id, MII_BMSR) & 0x0040) != 0)
574 wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9) | (1 << 8));
575
576 /* Receive descriptor ring. */
577 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rdesc);
578 wrl(ep, REG_RXDQBADD, addr);
579 wrl(ep, REG_RXDCURADD, addr);
580 wrw(ep, REG_RXDQBLEN, RX_QUEUE_ENTRIES * sizeof(struct ep93xx_rdesc));
581
582 /* Receive status ring. */
583 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rstat);
584 wrl(ep, REG_RXSTSQBADD, addr);
585 wrl(ep, REG_RXSTSQCURADD, addr);
586 wrw(ep, REG_RXSTSQBLEN, RX_QUEUE_ENTRIES * sizeof(struct ep93xx_rstat));
587
588 /* Transmit descriptor ring. */
589 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, tdesc);
590 wrl(ep, REG_TXDQBADD, addr);
591 wrl(ep, REG_TXDQCURADD, addr);
592 wrw(ep, REG_TXDQBLEN, TX_QUEUE_ENTRIES * sizeof(struct ep93xx_tdesc));
593
594 /* Transmit status ring. */
595 addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, tstat);
596 wrl(ep, REG_TXSTSQBADD, addr);
597 wrl(ep, REG_TXSTSQCURADD, addr);
598 wrw(ep, REG_TXSTSQBLEN, TX_QUEUE_ENTRIES * sizeof(struct ep93xx_tstat));
599
600 wrl(ep, REG_BMCTL, REG_BMCTL_ENABLE_TX | REG_BMCTL_ENABLE_RX);
601 wrl(ep, REG_INTEN, REG_INTEN_TX | REG_INTEN_RX);
602 wrl(ep, REG_GIINTMSK, 0);
603
604 for (i = 0; i < 10; i++) {
605 if ((rdl(ep, REG_BMSTS) & REG_BMSTS_RX_ACTIVE) != 0)
606 break;
607 msleep(1);
608 }
609
610 if (i == 10) {
611 pr_crit("hw failed to start\n");
612 return 1;
613 }
614
615 wrl(ep, REG_RXDENQ, RX_QUEUE_ENTRIES);
616 wrl(ep, REG_RXSTSENQ, RX_QUEUE_ENTRIES);
617
618 wrb(ep, REG_INDAD0, dev->dev_addr[0]);
619 wrb(ep, REG_INDAD1, dev->dev_addr[1]);
620 wrb(ep, REG_INDAD2, dev->dev_addr[2]);
621 wrb(ep, REG_INDAD3, dev->dev_addr[3]);
622 wrb(ep, REG_INDAD4, dev->dev_addr[4]);
623 wrb(ep, REG_INDAD5, dev->dev_addr[5]);
624 wrl(ep, REG_AFP, 0);
625
626 wrl(ep, REG_MAXFRMLEN, (MAX_PKT_SIZE << 16) | MAX_PKT_SIZE);
627
628 wrl(ep, REG_RXCTL, REG_RXCTL_DEFAULT);
629 wrl(ep, REG_TXCTL, REG_TXCTL_ENABLE);
630
631 return 0;
632 }
633
634 static void ep93xx_stop_hw(struct net_device *dev)
635 {
636 struct ep93xx_priv *ep = netdev_priv(dev);
637 int i;
638
639 wrl(ep, REG_SELFCTL, REG_SELFCTL_RESET);
640 for (i = 0; i < 10; i++) {
641 if ((rdl(ep, REG_SELFCTL) & REG_SELFCTL_RESET) == 0)
642 break;
643 msleep(1);
644 }
645
646 if (i == 10)
647 pr_crit("hw failed to reset\n");
648 }
649
650 static int ep93xx_open(struct net_device *dev)
651 {
652 struct ep93xx_priv *ep = netdev_priv(dev);
653 int err;
654
655 if (ep93xx_alloc_buffers(ep))
656 return -ENOMEM;
657
658 napi_enable(&ep->napi);
659
660 if (ep93xx_start_hw(dev)) {
661 napi_disable(&ep->napi);
662 ep93xx_free_buffers(ep);
663 return -EIO;
664 }
665
666 spin_lock_init(&ep->rx_lock);
667 ep->rx_pointer = 0;
668 ep->tx_clean_pointer = 0;
669 ep->tx_pointer = 0;
670 spin_lock_init(&ep->tx_pending_lock);
671 ep->tx_pending = 0;
672
673 err = request_irq(ep->irq, ep93xx_irq, IRQF_SHARED, dev->name, dev);
674 if (err) {
675 napi_disable(&ep->napi);
676 ep93xx_stop_hw(dev);
677 ep93xx_free_buffers(ep);
678 return err;
679 }
680
681 wrl(ep, REG_GIINTMSK, REG_GIINTMSK_ENABLE);
682
683 netif_start_queue(dev);
684
685 return 0;
686 }
687
688 static int ep93xx_close(struct net_device *dev)
689 {
690 struct ep93xx_priv *ep = netdev_priv(dev);
691
692 napi_disable(&ep->napi);
693 netif_stop_queue(dev);
694
695 wrl(ep, REG_GIINTMSK, 0);
696 free_irq(ep->irq, dev);
697 ep93xx_stop_hw(dev);
698 ep93xx_free_buffers(ep);
699
700 return 0;
701 }
702
703 static int ep93xx_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
704 {
705 struct ep93xx_priv *ep = netdev_priv(dev);
706 struct mii_ioctl_data *data = if_mii(ifr);
707
708 return generic_mii_ioctl(&ep->mii, data, cmd, NULL);
709 }
710
711 static void ep93xx_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
712 {
713 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
714 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
715 }
716
717 static int ep93xx_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
718 {
719 struct ep93xx_priv *ep = netdev_priv(dev);
720 return mii_ethtool_gset(&ep->mii, cmd);
721 }
722
723 static int ep93xx_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
724 {
725 struct ep93xx_priv *ep = netdev_priv(dev);
726 return mii_ethtool_sset(&ep->mii, cmd);
727 }
728
729 static int ep93xx_nway_reset(struct net_device *dev)
730 {
731 struct ep93xx_priv *ep = netdev_priv(dev);
732 return mii_nway_restart(&ep->mii);
733 }
734
735 static u32 ep93xx_get_link(struct net_device *dev)
736 {
737 struct ep93xx_priv *ep = netdev_priv(dev);
738 return mii_link_ok(&ep->mii);
739 }
740
741 static const struct ethtool_ops ep93xx_ethtool_ops = {
742 .get_drvinfo = ep93xx_get_drvinfo,
743 .get_settings = ep93xx_get_settings,
744 .set_settings = ep93xx_set_settings,
745 .nway_reset = ep93xx_nway_reset,
746 .get_link = ep93xx_get_link,
747 };
748
749 static const struct net_device_ops ep93xx_netdev_ops = {
750 .ndo_open = ep93xx_open,
751 .ndo_stop = ep93xx_close,
752 .ndo_start_xmit = ep93xx_xmit,
753 .ndo_do_ioctl = ep93xx_ioctl,
754 .ndo_validate_addr = eth_validate_addr,
755 .ndo_change_mtu = eth_change_mtu,
756 .ndo_set_mac_address = eth_mac_addr,
757 };
758
759 static struct net_device *ep93xx_dev_alloc(struct ep93xx_eth_data *data)
760 {
761 struct net_device *dev;
762
763 dev = alloc_etherdev(sizeof(struct ep93xx_priv));
764 if (dev == NULL)
765 return NULL;
766
767 memcpy(dev->dev_addr, data->dev_addr, ETH_ALEN);
768
769 dev->ethtool_ops = &ep93xx_ethtool_ops;
770 dev->netdev_ops = &ep93xx_netdev_ops;
771
772 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
773
774 return dev;
775 }
776
777
778 static int ep93xx_eth_remove(struct platform_device *pdev)
779 {
780 struct net_device *dev;
781 struct ep93xx_priv *ep;
782
783 dev = platform_get_drvdata(pdev);
784 if (dev == NULL)
785 return 0;
786
787 ep = netdev_priv(dev);
788
789 /* @@@ Force down. */
790 unregister_netdev(dev);
791 ep93xx_free_buffers(ep);
792
793 if (ep->base_addr != NULL)
794 iounmap(ep->base_addr);
795
796 if (ep->res != NULL) {
797 release_resource(ep->res);
798 kfree(ep->res);
799 }
800
801 free_netdev(dev);
802
803 return 0;
804 }
805
806 static int ep93xx_eth_probe(struct platform_device *pdev)
807 {
808 struct ep93xx_eth_data *data;
809 struct net_device *dev;
810 struct ep93xx_priv *ep;
811 struct resource *mem;
812 int irq;
813 int err;
814
815 if (pdev == NULL)
816 return -ENODEV;
817 data = pdev->dev.platform_data;
818
819 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
820 irq = platform_get_irq(pdev, 0);
821 if (!mem || irq < 0)
822 return -ENXIO;
823
824 dev = ep93xx_dev_alloc(data);
825 if (dev == NULL) {
826 err = -ENOMEM;
827 goto err_out;
828 }
829 ep = netdev_priv(dev);
830 ep->dev = dev;
831 SET_NETDEV_DEV(dev, &pdev->dev);
832 netif_napi_add(dev, &ep->napi, ep93xx_poll, 64);
833
834 platform_set_drvdata(pdev, dev);
835
836 ep->res = request_mem_region(mem->start, resource_size(mem),
837 dev_name(&pdev->dev));
838 if (ep->res == NULL) {
839 dev_err(&pdev->dev, "Could not reserve memory region\n");
840 err = -ENOMEM;
841 goto err_out;
842 }
843
844 ep->base_addr = ioremap(mem->start, resource_size(mem));
845 if (ep->base_addr == NULL) {
846 dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
847 err = -EIO;
848 goto err_out;
849 }
850 ep->irq = irq;
851
852 ep->mii.phy_id = data->phy_id;
853 ep->mii.phy_id_mask = 0x1f;
854 ep->mii.reg_num_mask = 0x1f;
855 ep->mii.dev = dev;
856 ep->mii.mdio_read = ep93xx_mdio_read;
857 ep->mii.mdio_write = ep93xx_mdio_write;
858 ep->mdc_divisor = 40; /* Max HCLK 100 MHz, min MDIO clk 2.5 MHz. */
859
860 if (is_zero_ether_addr(dev->dev_addr))
861 eth_hw_addr_random(dev);
862
863 err = register_netdev(dev);
864 if (err) {
865 dev_err(&pdev->dev, "Failed to register netdev\n");
866 goto err_out;
867 }
868
869 printk(KERN_INFO "%s: ep93xx on-chip ethernet, IRQ %d, %pM\n",
870 dev->name, ep->irq, dev->dev_addr);
871
872 return 0;
873
874 err_out:
875 ep93xx_eth_remove(pdev);
876 return err;
877 }
878
879
880 static struct platform_driver ep93xx_eth_driver = {
881 .probe = ep93xx_eth_probe,
882 .remove = ep93xx_eth_remove,
883 .driver = {
884 .name = "ep93xx-eth",
885 .owner = THIS_MODULE,
886 },
887 };
888
889 module_platform_driver(ep93xx_eth_driver);
890
891 MODULE_LICENSE("GPL");
892 MODULE_ALIAS("platform:ep93xx-eth");
Linux kernel - Deliverables
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