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Merge branch 'perf/rbtree_copy' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / drivers / net / ethernet / faraday / ftmac100.c
1 /*
2 * Faraday FTMAC100 10/100 Ethernet
3 *
4 * (C) Copyright 2009-2011 Faraday Technology
5 * Po-Yu Chuang <ratbert@faraday-tech.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24 #include <linux/dma-mapping.h>
25 #include <linux/etherdevice.h>
26 #include <linux/ethtool.h>
27 #include <linux/init.h>
28 #include <linux/interrupt.h>
29 #include <linux/io.h>
30 #include <linux/mii.h>
31 #include <linux/module.h>
32 #include <linux/netdevice.h>
33 #include <linux/platform_device.h>
34
35 #include "ftmac100.h"
36
37 #define DRV_NAME "ftmac100"
38 #define DRV_VERSION "0.2"
39
40 #define RX_QUEUE_ENTRIES 128 /* must be power of 2 */
41 #define TX_QUEUE_ENTRIES 16 /* must be power of 2 */
42
43 #define MAX_PKT_SIZE 1518
44 #define RX_BUF_SIZE 2044 /* must be smaller than 0x7ff */
45
46 #if MAX_PKT_SIZE > 0x7ff
47 #error invalid MAX_PKT_SIZE
48 #endif
49
50 #if RX_BUF_SIZE > 0x7ff || RX_BUF_SIZE > PAGE_SIZE
51 #error invalid RX_BUF_SIZE
52 #endif
53
54 /******************************************************************************
55 * private data
56 *****************************************************************************/
57 struct ftmac100_descs {
58 struct ftmac100_rxdes rxdes[RX_QUEUE_ENTRIES];
59 struct ftmac100_txdes txdes[TX_QUEUE_ENTRIES];
60 };
61
62 struct ftmac100 {
63 struct resource *res;
64 void __iomem *base;
65 int irq;
66
67 struct ftmac100_descs *descs;
68 dma_addr_t descs_dma_addr;
69
70 unsigned int rx_pointer;
71 unsigned int tx_clean_pointer;
72 unsigned int tx_pointer;
73 unsigned int tx_pending;
74
75 spinlock_t tx_lock;
76
77 struct net_device *netdev;
78 struct device *dev;
79 struct napi_struct napi;
80
81 struct mii_if_info mii;
82 };
83
84 static int ftmac100_alloc_rx_page(struct ftmac100 *priv,
85 struct ftmac100_rxdes *rxdes, gfp_t gfp);
86
87 /******************************************************************************
88 * internal functions (hardware register access)
89 *****************************************************************************/
90 #define INT_MASK_ALL_ENABLED (FTMAC100_INT_RPKT_FINISH | \
91 FTMAC100_INT_NORXBUF | \
92 FTMAC100_INT_XPKT_OK | \
93 FTMAC100_INT_XPKT_LOST | \
94 FTMAC100_INT_RPKT_LOST | \
95 FTMAC100_INT_AHB_ERR | \
96 FTMAC100_INT_PHYSTS_CHG)
97
98 #define INT_MASK_ALL_DISABLED 0
99
100 static void ftmac100_enable_all_int(struct ftmac100 *priv)
101 {
102 iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTMAC100_OFFSET_IMR);
103 }
104
105 static void ftmac100_disable_all_int(struct ftmac100 *priv)
106 {
107 iowrite32(INT_MASK_ALL_DISABLED, priv->base + FTMAC100_OFFSET_IMR);
108 }
109
110 static void ftmac100_set_rx_ring_base(struct ftmac100 *priv, dma_addr_t addr)
111 {
112 iowrite32(addr, priv->base + FTMAC100_OFFSET_RXR_BADR);
113 }
114
115 static void ftmac100_set_tx_ring_base(struct ftmac100 *priv, dma_addr_t addr)
116 {
117 iowrite32(addr, priv->base + FTMAC100_OFFSET_TXR_BADR);
118 }
119
120 static void ftmac100_txdma_start_polling(struct ftmac100 *priv)
121 {
122 iowrite32(1, priv->base + FTMAC100_OFFSET_TXPD);
123 }
124
125 static int ftmac100_reset(struct ftmac100 *priv)
126 {
127 struct net_device *netdev = priv->netdev;
128 int i;
129
130 /* NOTE: reset clears all registers */
131 iowrite32(FTMAC100_MACCR_SW_RST, priv->base + FTMAC100_OFFSET_MACCR);
132
133 for (i = 0; i < 5; i++) {
134 unsigned int maccr;
135
136 maccr = ioread32(priv->base + FTMAC100_OFFSET_MACCR);
137 if (!(maccr & FTMAC100_MACCR_SW_RST)) {
138 /*
139 * FTMAC100_MACCR_SW_RST cleared does not indicate
140 * that hardware reset completed (what the f*ck).
141 * We still need to wait for a while.
142 */
143 udelay(500);
144 return 0;
145 }
146
147 udelay(1000);
148 }
149
150 netdev_err(netdev, "software reset failed\n");
151 return -EIO;
152 }
153
154 static void ftmac100_set_mac(struct ftmac100 *priv, const unsigned char *mac)
155 {
156 unsigned int maddr = mac[0] << 8 | mac[1];
157 unsigned int laddr = mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5];
158
159 iowrite32(maddr, priv->base + FTMAC100_OFFSET_MAC_MADR);
160 iowrite32(laddr, priv->base + FTMAC100_OFFSET_MAC_LADR);
161 }
162
163 #define MACCR_ENABLE_ALL (FTMAC100_MACCR_XMT_EN | \
164 FTMAC100_MACCR_RCV_EN | \
165 FTMAC100_MACCR_XDMA_EN | \
166 FTMAC100_MACCR_RDMA_EN | \
167 FTMAC100_MACCR_CRC_APD | \
168 FTMAC100_MACCR_FULLDUP | \
169 FTMAC100_MACCR_RX_RUNT | \
170 FTMAC100_MACCR_RX_BROADPKT)
171
172 static int ftmac100_start_hw(struct ftmac100 *priv)
173 {
174 struct net_device *netdev = priv->netdev;
175
176 if (ftmac100_reset(priv))
177 return -EIO;
178
179 /* setup ring buffer base registers */
180 ftmac100_set_rx_ring_base(priv,
181 priv->descs_dma_addr +
182 offsetof(struct ftmac100_descs, rxdes));
183 ftmac100_set_tx_ring_base(priv,
184 priv->descs_dma_addr +
185 offsetof(struct ftmac100_descs, txdes));
186
187 iowrite32(FTMAC100_APTC_RXPOLL_CNT(1), priv->base + FTMAC100_OFFSET_APTC);
188
189 ftmac100_set_mac(priv, netdev->dev_addr);
190
191 iowrite32(MACCR_ENABLE_ALL, priv->base + FTMAC100_OFFSET_MACCR);
192 return 0;
193 }
194
195 static void ftmac100_stop_hw(struct ftmac100 *priv)
196 {
197 iowrite32(0, priv->base + FTMAC100_OFFSET_MACCR);
198 }
199
200 /******************************************************************************
201 * internal functions (receive descriptor)
202 *****************************************************************************/
203 static bool ftmac100_rxdes_first_segment(struct ftmac100_rxdes *rxdes)
204 {
205 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_FRS);
206 }
207
208 static bool ftmac100_rxdes_last_segment(struct ftmac100_rxdes *rxdes)
209 {
210 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_LRS);
211 }
212
213 static bool ftmac100_rxdes_owned_by_dma(struct ftmac100_rxdes *rxdes)
214 {
215 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN);
216 }
217
218 static void ftmac100_rxdes_set_dma_own(struct ftmac100_rxdes *rxdes)
219 {
220 /* clear status bits */
221 rxdes->rxdes0 = cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN);
222 }
223
224 static bool ftmac100_rxdes_rx_error(struct ftmac100_rxdes *rxdes)
225 {
226 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ERR);
227 }
228
229 static bool ftmac100_rxdes_crc_error(struct ftmac100_rxdes *rxdes)
230 {
231 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_CRC_ERR);
232 }
233
234 static bool ftmac100_rxdes_frame_too_long(struct ftmac100_rxdes *rxdes)
235 {
236 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_FTL);
237 }
238
239 static bool ftmac100_rxdes_runt(struct ftmac100_rxdes *rxdes)
240 {
241 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RUNT);
242 }
243
244 static bool ftmac100_rxdes_odd_nibble(struct ftmac100_rxdes *rxdes)
245 {
246 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ODD_NB);
247 }
248
249 static unsigned int ftmac100_rxdes_frame_length(struct ftmac100_rxdes *rxdes)
250 {
251 return le32_to_cpu(rxdes->rxdes0) & FTMAC100_RXDES0_RFL;
252 }
253
254 static bool ftmac100_rxdes_multicast(struct ftmac100_rxdes *rxdes)
255 {
256 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_MULTICAST);
257 }
258
259 static void ftmac100_rxdes_set_buffer_size(struct ftmac100_rxdes *rxdes,
260 unsigned int size)
261 {
262 rxdes->rxdes1 &= cpu_to_le32(FTMAC100_RXDES1_EDORR);
263 rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_RXBUF_SIZE(size));
264 }
265
266 static void ftmac100_rxdes_set_end_of_ring(struct ftmac100_rxdes *rxdes)
267 {
268 rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_EDORR);
269 }
270
271 static void ftmac100_rxdes_set_dma_addr(struct ftmac100_rxdes *rxdes,
272 dma_addr_t addr)
273 {
274 rxdes->rxdes2 = cpu_to_le32(addr);
275 }
276
277 static dma_addr_t ftmac100_rxdes_get_dma_addr(struct ftmac100_rxdes *rxdes)
278 {
279 return le32_to_cpu(rxdes->rxdes2);
280 }
281
282 /*
283 * rxdes3 is not used by hardware. We use it to keep track of page.
284 * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
285 */
286 static void ftmac100_rxdes_set_page(struct ftmac100_rxdes *rxdes, struct page *page)
287 {
288 rxdes->rxdes3 = (unsigned int)page;
289 }
290
291 static struct page *ftmac100_rxdes_get_page(struct ftmac100_rxdes *rxdes)
292 {
293 return (struct page *)rxdes->rxdes3;
294 }
295
296 /******************************************************************************
297 * internal functions (receive)
298 *****************************************************************************/
299 static int ftmac100_next_rx_pointer(int pointer)
300 {
301 return (pointer + 1) & (RX_QUEUE_ENTRIES - 1);
302 }
303
304 static void ftmac100_rx_pointer_advance(struct ftmac100 *priv)
305 {
306 priv->rx_pointer = ftmac100_next_rx_pointer(priv->rx_pointer);
307 }
308
309 static struct ftmac100_rxdes *ftmac100_current_rxdes(struct ftmac100 *priv)
310 {
311 return &priv->descs->rxdes[priv->rx_pointer];
312 }
313
314 static struct ftmac100_rxdes *
315 ftmac100_rx_locate_first_segment(struct ftmac100 *priv)
316 {
317 struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv);
318
319 while (!ftmac100_rxdes_owned_by_dma(rxdes)) {
320 if (ftmac100_rxdes_first_segment(rxdes))
321 return rxdes;
322
323 ftmac100_rxdes_set_dma_own(rxdes);
324 ftmac100_rx_pointer_advance(priv);
325 rxdes = ftmac100_current_rxdes(priv);
326 }
327
328 return NULL;
329 }
330
331 static bool ftmac100_rx_packet_error(struct ftmac100 *priv,
332 struct ftmac100_rxdes *rxdes)
333 {
334 struct net_device *netdev = priv->netdev;
335 bool error = false;
336
337 if (unlikely(ftmac100_rxdes_rx_error(rxdes))) {
338 if (net_ratelimit())
339 netdev_info(netdev, "rx err\n");
340
341 netdev->stats.rx_errors++;
342 error = true;
343 }
344
345 if (unlikely(ftmac100_rxdes_crc_error(rxdes))) {
346 if (net_ratelimit())
347 netdev_info(netdev, "rx crc err\n");
348
349 netdev->stats.rx_crc_errors++;
350 error = true;
351 }
352
353 if (unlikely(ftmac100_rxdes_frame_too_long(rxdes))) {
354 if (net_ratelimit())
355 netdev_info(netdev, "rx frame too long\n");
356
357 netdev->stats.rx_length_errors++;
358 error = true;
359 } else if (unlikely(ftmac100_rxdes_runt(rxdes))) {
360 if (net_ratelimit())
361 netdev_info(netdev, "rx runt\n");
362
363 netdev->stats.rx_length_errors++;
364 error = true;
365 } else if (unlikely(ftmac100_rxdes_odd_nibble(rxdes))) {
366 if (net_ratelimit())
367 netdev_info(netdev, "rx odd nibble\n");
368
369 netdev->stats.rx_length_errors++;
370 error = true;
371 }
372
373 return error;
374 }
375
376 static void ftmac100_rx_drop_packet(struct ftmac100 *priv)
377 {
378 struct net_device *netdev = priv->netdev;
379 struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv);
380 bool done = false;
381
382 if (net_ratelimit())
383 netdev_dbg(netdev, "drop packet %p\n", rxdes);
384
385 do {
386 if (ftmac100_rxdes_last_segment(rxdes))
387 done = true;
388
389 ftmac100_rxdes_set_dma_own(rxdes);
390 ftmac100_rx_pointer_advance(priv);
391 rxdes = ftmac100_current_rxdes(priv);
392 } while (!done && !ftmac100_rxdes_owned_by_dma(rxdes));
393
394 netdev->stats.rx_dropped++;
395 }
396
397 static bool ftmac100_rx_packet(struct ftmac100 *priv, int *processed)
398 {
399 struct net_device *netdev = priv->netdev;
400 struct ftmac100_rxdes *rxdes;
401 struct sk_buff *skb;
402 struct page *page;
403 dma_addr_t map;
404 int length;
405
406 rxdes = ftmac100_rx_locate_first_segment(priv);
407 if (!rxdes)
408 return false;
409
410 if (unlikely(ftmac100_rx_packet_error(priv, rxdes))) {
411 ftmac100_rx_drop_packet(priv);
412 return true;
413 }
414
415 /*
416 * It is impossible to get multi-segment packets
417 * because we always provide big enough receive buffers.
418 */
419 if (unlikely(!ftmac100_rxdes_last_segment(rxdes)))
420 BUG();
421
422 /* start processing */
423 skb = netdev_alloc_skb_ip_align(netdev, 128);
424 if (unlikely(!skb)) {
425 if (net_ratelimit())
426 netdev_err(netdev, "rx skb alloc failed\n");
427
428 ftmac100_rx_drop_packet(priv);
429 return true;
430 }
431
432 if (unlikely(ftmac100_rxdes_multicast(rxdes)))
433 netdev->stats.multicast++;
434
435 map = ftmac100_rxdes_get_dma_addr(rxdes);
436 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
437
438 length = ftmac100_rxdes_frame_length(rxdes);
439 page = ftmac100_rxdes_get_page(rxdes);
440 skb_fill_page_desc(skb, 0, page, 0, length);
441 skb->len += length;
442 skb->data_len += length;
443
444 if (length > 128) {
445 skb->truesize += PAGE_SIZE;
446 /* We pull the minimum amount into linear part */
447 __pskb_pull_tail(skb, ETH_HLEN);
448 } else {
449 /* Small frames are copied into linear part to free one page */
450 __pskb_pull_tail(skb, length);
451 }
452 ftmac100_alloc_rx_page(priv, rxdes, GFP_ATOMIC);
453
454 ftmac100_rx_pointer_advance(priv);
455
456 skb->protocol = eth_type_trans(skb, netdev);
457
458 netdev->stats.rx_packets++;
459 netdev->stats.rx_bytes += skb->len;
460
461 /* push packet to protocol stack */
462 netif_receive_skb(skb);
463
464 (*processed)++;
465 return true;
466 }
467
468 /******************************************************************************
469 * internal functions (transmit descriptor)
470 *****************************************************************************/
471 static void ftmac100_txdes_reset(struct ftmac100_txdes *txdes)
472 {
473 /* clear all except end of ring bit */
474 txdes->txdes0 = 0;
475 txdes->txdes1 &= cpu_to_le32(FTMAC100_TXDES1_EDOTR);
476 txdes->txdes2 = 0;
477 txdes->txdes3 = 0;
478 }
479
480 static bool ftmac100_txdes_owned_by_dma(struct ftmac100_txdes *txdes)
481 {
482 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN);
483 }
484
485 static void ftmac100_txdes_set_dma_own(struct ftmac100_txdes *txdes)
486 {
487 /*
488 * Make sure dma own bit will not be set before any other
489 * descriptor fields.
490 */
491 wmb();
492 txdes->txdes0 |= cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN);
493 }
494
495 static bool ftmac100_txdes_excessive_collision(struct ftmac100_txdes *txdes)
496 {
497 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_EXSCOL);
498 }
499
500 static bool ftmac100_txdes_late_collision(struct ftmac100_txdes *txdes)
501 {
502 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_LATECOL);
503 }
504
505 static void ftmac100_txdes_set_end_of_ring(struct ftmac100_txdes *txdes)
506 {
507 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_EDOTR);
508 }
509
510 static void ftmac100_txdes_set_first_segment(struct ftmac100_txdes *txdes)
511 {
512 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_FTS);
513 }
514
515 static void ftmac100_txdes_set_last_segment(struct ftmac100_txdes *txdes)
516 {
517 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_LTS);
518 }
519
520 static void ftmac100_txdes_set_txint(struct ftmac100_txdes *txdes)
521 {
522 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXIC);
523 }
524
525 static void ftmac100_txdes_set_buffer_size(struct ftmac100_txdes *txdes,
526 unsigned int len)
527 {
528 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXBUF_SIZE(len));
529 }
530
531 static void ftmac100_txdes_set_dma_addr(struct ftmac100_txdes *txdes,
532 dma_addr_t addr)
533 {
534 txdes->txdes2 = cpu_to_le32(addr);
535 }
536
537 static dma_addr_t ftmac100_txdes_get_dma_addr(struct ftmac100_txdes *txdes)
538 {
539 return le32_to_cpu(txdes->txdes2);
540 }
541
542 /*
543 * txdes3 is not used by hardware. We use it to keep track of socket buffer.
544 * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
545 */
546 static void ftmac100_txdes_set_skb(struct ftmac100_txdes *txdes, struct sk_buff *skb)
547 {
548 txdes->txdes3 = (unsigned int)skb;
549 }
550
551 static struct sk_buff *ftmac100_txdes_get_skb(struct ftmac100_txdes *txdes)
552 {
553 return (struct sk_buff *)txdes->txdes3;
554 }
555
556 /******************************************************************************
557 * internal functions (transmit)
558 *****************************************************************************/
559 static int ftmac100_next_tx_pointer(int pointer)
560 {
561 return (pointer + 1) & (TX_QUEUE_ENTRIES - 1);
562 }
563
564 static void ftmac100_tx_pointer_advance(struct ftmac100 *priv)
565 {
566 priv->tx_pointer = ftmac100_next_tx_pointer(priv->tx_pointer);
567 }
568
569 static void ftmac100_tx_clean_pointer_advance(struct ftmac100 *priv)
570 {
571 priv->tx_clean_pointer = ftmac100_next_tx_pointer(priv->tx_clean_pointer);
572 }
573
574 static struct ftmac100_txdes *ftmac100_current_txdes(struct ftmac100 *priv)
575 {
576 return &priv->descs->txdes[priv->tx_pointer];
577 }
578
579 static struct ftmac100_txdes *ftmac100_current_clean_txdes(struct ftmac100 *priv)
580 {
581 return &priv->descs->txdes[priv->tx_clean_pointer];
582 }
583
584 static bool ftmac100_tx_complete_packet(struct ftmac100 *priv)
585 {
586 struct net_device *netdev = priv->netdev;
587 struct ftmac100_txdes *txdes;
588 struct sk_buff *skb;
589 dma_addr_t map;
590
591 if (priv->tx_pending == 0)
592 return false;
593
594 txdes = ftmac100_current_clean_txdes(priv);
595
596 if (ftmac100_txdes_owned_by_dma(txdes))
597 return false;
598
599 skb = ftmac100_txdes_get_skb(txdes);
600 map = ftmac100_txdes_get_dma_addr(txdes);
601
602 if (unlikely(ftmac100_txdes_excessive_collision(txdes) ||
603 ftmac100_txdes_late_collision(txdes))) {
604 /*
605 * packet transmitted to ethernet lost due to late collision
606 * or excessive collision
607 */
608 netdev->stats.tx_aborted_errors++;
609 } else {
610 netdev->stats.tx_packets++;
611 netdev->stats.tx_bytes += skb->len;
612 }
613
614 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
615 dev_kfree_skb(skb);
616
617 ftmac100_txdes_reset(txdes);
618
619 ftmac100_tx_clean_pointer_advance(priv);
620
621 spin_lock(&priv->tx_lock);
622 priv->tx_pending--;
623 spin_unlock(&priv->tx_lock);
624 netif_wake_queue(netdev);
625
626 return true;
627 }
628
629 static void ftmac100_tx_complete(struct ftmac100 *priv)
630 {
631 while (ftmac100_tx_complete_packet(priv))
632 ;
633 }
634
635 static int ftmac100_xmit(struct ftmac100 *priv, struct sk_buff *skb,
636 dma_addr_t map)
637 {
638 struct net_device *netdev = priv->netdev;
639 struct ftmac100_txdes *txdes;
640 unsigned int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
641
642 txdes = ftmac100_current_txdes(priv);
643 ftmac100_tx_pointer_advance(priv);
644
645 /* setup TX descriptor */
646 ftmac100_txdes_set_skb(txdes, skb);
647 ftmac100_txdes_set_dma_addr(txdes, map);
648
649 ftmac100_txdes_set_first_segment(txdes);
650 ftmac100_txdes_set_last_segment(txdes);
651 ftmac100_txdes_set_txint(txdes);
652 ftmac100_txdes_set_buffer_size(txdes, len);
653
654 spin_lock(&priv->tx_lock);
655 priv->tx_pending++;
656 if (priv->tx_pending == TX_QUEUE_ENTRIES)
657 netif_stop_queue(netdev);
658
659 /* start transmit */
660 ftmac100_txdes_set_dma_own(txdes);
661 spin_unlock(&priv->tx_lock);
662
663 ftmac100_txdma_start_polling(priv);
664 return NETDEV_TX_OK;
665 }
666
667 /******************************************************************************
668 * internal functions (buffer)
669 *****************************************************************************/
670 static int ftmac100_alloc_rx_page(struct ftmac100 *priv,
671 struct ftmac100_rxdes *rxdes, gfp_t gfp)
672 {
673 struct net_device *netdev = priv->netdev;
674 struct page *page;
675 dma_addr_t map;
676
677 page = alloc_page(gfp);
678 if (!page) {
679 if (net_ratelimit())
680 netdev_err(netdev, "failed to allocate rx page\n");
681 return -ENOMEM;
682 }
683
684 map = dma_map_page(priv->dev, page, 0, RX_BUF_SIZE, DMA_FROM_DEVICE);
685 if (unlikely(dma_mapping_error(priv->dev, map))) {
686 if (net_ratelimit())
687 netdev_err(netdev, "failed to map rx page\n");
688 __free_page(page);
689 return -ENOMEM;
690 }
691
692 ftmac100_rxdes_set_page(rxdes, page);
693 ftmac100_rxdes_set_dma_addr(rxdes, map);
694 ftmac100_rxdes_set_buffer_size(rxdes, RX_BUF_SIZE);
695 ftmac100_rxdes_set_dma_own(rxdes);
696 return 0;
697 }
698
699 static void ftmac100_free_buffers(struct ftmac100 *priv)
700 {
701 int i;
702
703 for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
704 struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i];
705 struct page *page = ftmac100_rxdes_get_page(rxdes);
706 dma_addr_t map = ftmac100_rxdes_get_dma_addr(rxdes);
707
708 if (!page)
709 continue;
710
711 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
712 __free_page(page);
713 }
714
715 for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
716 struct ftmac100_txdes *txdes = &priv->descs->txdes[i];
717 struct sk_buff *skb = ftmac100_txdes_get_skb(txdes);
718 dma_addr_t map = ftmac100_txdes_get_dma_addr(txdes);
719
720 if (!skb)
721 continue;
722
723 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
724 dev_kfree_skb(skb);
725 }
726
727 dma_free_coherent(priv->dev, sizeof(struct ftmac100_descs),
728 priv->descs, priv->descs_dma_addr);
729 }
730
731 static int ftmac100_alloc_buffers(struct ftmac100 *priv)
732 {
733 int i;
734
735 priv->descs = dma_zalloc_coherent(priv->dev,
736 sizeof(struct ftmac100_descs),
737 &priv->descs_dma_addr,
738 GFP_KERNEL);
739 if (!priv->descs)
740 return -ENOMEM;
741
742 /* initialize RX ring */
743 ftmac100_rxdes_set_end_of_ring(&priv->descs->rxdes[RX_QUEUE_ENTRIES - 1]);
744
745 for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
746 struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i];
747
748 if (ftmac100_alloc_rx_page(priv, rxdes, GFP_KERNEL))
749 goto err;
750 }
751
752 /* initialize TX ring */
753 ftmac100_txdes_set_end_of_ring(&priv->descs->txdes[TX_QUEUE_ENTRIES - 1]);
754 return 0;
755
756 err:
757 ftmac100_free_buffers(priv);
758 return -ENOMEM;
759 }
760
761 /******************************************************************************
762 * struct mii_if_info functions
763 *****************************************************************************/
764 static int ftmac100_mdio_read(struct net_device *netdev, int phy_id, int reg)
765 {
766 struct ftmac100 *priv = netdev_priv(netdev);
767 unsigned int phycr;
768 int i;
769
770 phycr = FTMAC100_PHYCR_PHYAD(phy_id) |
771 FTMAC100_PHYCR_REGAD(reg) |
772 FTMAC100_PHYCR_MIIRD;
773
774 iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR);
775
776 for (i = 0; i < 10; i++) {
777 phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR);
778
779 if ((phycr & FTMAC100_PHYCR_MIIRD) == 0)
780 return phycr & FTMAC100_PHYCR_MIIRDATA;
781
782 udelay(100);
783 }
784
785 netdev_err(netdev, "mdio read timed out\n");
786 return 0;
787 }
788
789 static void ftmac100_mdio_write(struct net_device *netdev, int phy_id, int reg,
790 int data)
791 {
792 struct ftmac100 *priv = netdev_priv(netdev);
793 unsigned int phycr;
794 int i;
795
796 phycr = FTMAC100_PHYCR_PHYAD(phy_id) |
797 FTMAC100_PHYCR_REGAD(reg) |
798 FTMAC100_PHYCR_MIIWR;
799
800 data = FTMAC100_PHYWDATA_MIIWDATA(data);
801
802 iowrite32(data, priv->base + FTMAC100_OFFSET_PHYWDATA);
803 iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR);
804
805 for (i = 0; i < 10; i++) {
806 phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR);
807
808 if ((phycr & FTMAC100_PHYCR_MIIWR) == 0)
809 return;
810
811 udelay(100);
812 }
813
814 netdev_err(netdev, "mdio write timed out\n");
815 }
816
817 /******************************************************************************
818 * struct ethtool_ops functions
819 *****************************************************************************/
820 static void ftmac100_get_drvinfo(struct net_device *netdev,
821 struct ethtool_drvinfo *info)
822 {
823 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
824 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
825 strlcpy(info->bus_info, dev_name(&netdev->dev), sizeof(info->bus_info));
826 }
827
828 static int ftmac100_get_settings(struct net_device *netdev, struct ethtool_cmd *cmd)
829 {
830 struct ftmac100 *priv = netdev_priv(netdev);
831 return mii_ethtool_gset(&priv->mii, cmd);
832 }
833
834 static int ftmac100_set_settings(struct net_device *netdev, struct ethtool_cmd *cmd)
835 {
836 struct ftmac100 *priv = netdev_priv(netdev);
837 return mii_ethtool_sset(&priv->mii, cmd);
838 }
839
840 static int ftmac100_nway_reset(struct net_device *netdev)
841 {
842 struct ftmac100 *priv = netdev_priv(netdev);
843 return mii_nway_restart(&priv->mii);
844 }
845
846 static u32 ftmac100_get_link(struct net_device *netdev)
847 {
848 struct ftmac100 *priv = netdev_priv(netdev);
849 return mii_link_ok(&priv->mii);
850 }
851
852 static const struct ethtool_ops ftmac100_ethtool_ops = {
853 .set_settings = ftmac100_set_settings,
854 .get_settings = ftmac100_get_settings,
855 .get_drvinfo = ftmac100_get_drvinfo,
856 .nway_reset = ftmac100_nway_reset,
857 .get_link = ftmac100_get_link,
858 };
859
860 /******************************************************************************
861 * interrupt handler
862 *****************************************************************************/
863 static irqreturn_t ftmac100_interrupt(int irq, void *dev_id)
864 {
865 struct net_device *netdev = dev_id;
866 struct ftmac100 *priv = netdev_priv(netdev);
867
868 if (likely(netif_running(netdev))) {
869 /* Disable interrupts for polling */
870 ftmac100_disable_all_int(priv);
871 napi_schedule(&priv->napi);
872 }
873
874 return IRQ_HANDLED;
875 }
876
877 /******************************************************************************
878 * struct napi_struct functions
879 *****************************************************************************/
880 static int ftmac100_poll(struct napi_struct *napi, int budget)
881 {
882 struct ftmac100 *priv = container_of(napi, struct ftmac100, napi);
883 struct net_device *netdev = priv->netdev;
884 unsigned int status;
885 bool completed = true;
886 int rx = 0;
887
888 status = ioread32(priv->base + FTMAC100_OFFSET_ISR);
889
890 if (status & (FTMAC100_INT_RPKT_FINISH | FTMAC100_INT_NORXBUF)) {
891 /*
892 * FTMAC100_INT_RPKT_FINISH:
893 * RX DMA has received packets into RX buffer successfully
894 *
895 * FTMAC100_INT_NORXBUF:
896 * RX buffer unavailable
897 */
898 bool retry;
899
900 do {
901 retry = ftmac100_rx_packet(priv, &rx);
902 } while (retry && rx < budget);
903
904 if (retry && rx == budget)
905 completed = false;
906 }
907
908 if (status & (FTMAC100_INT_XPKT_OK | FTMAC100_INT_XPKT_LOST)) {
909 /*
910 * FTMAC100_INT_XPKT_OK:
911 * packet transmitted to ethernet successfully
912 *
913 * FTMAC100_INT_XPKT_LOST:
914 * packet transmitted to ethernet lost due to late
915 * collision or excessive collision
916 */
917 ftmac100_tx_complete(priv);
918 }
919
920 if (status & (FTMAC100_INT_NORXBUF | FTMAC100_INT_RPKT_LOST |
921 FTMAC100_INT_AHB_ERR | FTMAC100_INT_PHYSTS_CHG)) {
922 if (net_ratelimit())
923 netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status,
924 status & FTMAC100_INT_NORXBUF ? "NORXBUF " : "",
925 status & FTMAC100_INT_RPKT_LOST ? "RPKT_LOST " : "",
926 status & FTMAC100_INT_AHB_ERR ? "AHB_ERR " : "",
927 status & FTMAC100_INT_PHYSTS_CHG ? "PHYSTS_CHG" : "");
928
929 if (status & FTMAC100_INT_NORXBUF) {
930 /* RX buffer unavailable */
931 netdev->stats.rx_over_errors++;
932 }
933
934 if (status & FTMAC100_INT_RPKT_LOST) {
935 /* received packet lost due to RX FIFO full */
936 netdev->stats.rx_fifo_errors++;
937 }
938
939 if (status & FTMAC100_INT_PHYSTS_CHG) {
940 /* PHY link status change */
941 mii_check_link(&priv->mii);
942 }
943 }
944
945 if (completed) {
946 /* stop polling */
947 napi_complete(napi);
948 ftmac100_enable_all_int(priv);
949 }
950
951 return rx;
952 }
953
954 /******************************************************************************
955 * struct net_device_ops functions
956 *****************************************************************************/
957 static int ftmac100_open(struct net_device *netdev)
958 {
959 struct ftmac100 *priv = netdev_priv(netdev);
960 int err;
961
962 err = ftmac100_alloc_buffers(priv);
963 if (err) {
964 netdev_err(netdev, "failed to allocate buffers\n");
965 goto err_alloc;
966 }
967
968 err = request_irq(priv->irq, ftmac100_interrupt, 0, netdev->name, netdev);
969 if (err) {
970 netdev_err(netdev, "failed to request irq %d\n", priv->irq);
971 goto err_irq;
972 }
973
974 priv->rx_pointer = 0;
975 priv->tx_clean_pointer = 0;
976 priv->tx_pointer = 0;
977 priv->tx_pending = 0;
978
979 err = ftmac100_start_hw(priv);
980 if (err)
981 goto err_hw;
982
983 napi_enable(&priv->napi);
984 netif_start_queue(netdev);
985
986 ftmac100_enable_all_int(priv);
987
988 return 0;
989
990 err_hw:
991 free_irq(priv->irq, netdev);
992 err_irq:
993 ftmac100_free_buffers(priv);
994 err_alloc:
995 return err;
996 }
997
998 static int ftmac100_stop(struct net_device *netdev)
999 {
1000 struct ftmac100 *priv = netdev_priv(netdev);
1001
1002 ftmac100_disable_all_int(priv);
1003 netif_stop_queue(netdev);
1004 napi_disable(&priv->napi);
1005 ftmac100_stop_hw(priv);
1006 free_irq(priv->irq, netdev);
1007 ftmac100_free_buffers(priv);
1008
1009 return 0;
1010 }
1011
1012 static int ftmac100_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev)
1013 {
1014 struct ftmac100 *priv = netdev_priv(netdev);
1015 dma_addr_t map;
1016
1017 if (unlikely(skb->len > MAX_PKT_SIZE)) {
1018 if (net_ratelimit())
1019 netdev_dbg(netdev, "tx packet too big\n");
1020
1021 netdev->stats.tx_dropped++;
1022 dev_kfree_skb(skb);
1023 return NETDEV_TX_OK;
1024 }
1025
1026 map = dma_map_single(priv->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
1027 if (unlikely(dma_mapping_error(priv->dev, map))) {
1028 /* drop packet */
1029 if (net_ratelimit())
1030 netdev_err(netdev, "map socket buffer failed\n");
1031
1032 netdev->stats.tx_dropped++;
1033 dev_kfree_skb(skb);
1034 return NETDEV_TX_OK;
1035 }
1036
1037 return ftmac100_xmit(priv, skb, map);
1038 }
1039
1040 /* optional */
1041 static int ftmac100_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
1042 {
1043 struct ftmac100 *priv = netdev_priv(netdev);
1044 struct mii_ioctl_data *data = if_mii(ifr);
1045
1046 return generic_mii_ioctl(&priv->mii, data, cmd, NULL);
1047 }
1048
1049 static const struct net_device_ops ftmac100_netdev_ops = {
1050 .ndo_open = ftmac100_open,
1051 .ndo_stop = ftmac100_stop,
1052 .ndo_start_xmit = ftmac100_hard_start_xmit,
1053 .ndo_set_mac_address = eth_mac_addr,
1054 .ndo_validate_addr = eth_validate_addr,
1055 .ndo_do_ioctl = ftmac100_do_ioctl,
1056 };
1057
1058 /******************************************************************************
1059 * struct platform_driver functions
1060 *****************************************************************************/
1061 static int ftmac100_probe(struct platform_device *pdev)
1062 {
1063 struct resource *res;
1064 int irq;
1065 struct net_device *netdev;
1066 struct ftmac100 *priv;
1067 int err;
1068
1069 if (!pdev)
1070 return -ENODEV;
1071
1072 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1073 if (!res)
1074 return -ENXIO;
1075
1076 irq = platform_get_irq(pdev, 0);
1077 if (irq < 0)
1078 return irq;
1079
1080 /* setup net_device */
1081 netdev = alloc_etherdev(sizeof(*priv));
1082 if (!netdev) {
1083 err = -ENOMEM;
1084 goto err_alloc_etherdev;
1085 }
1086
1087 SET_NETDEV_DEV(netdev, &pdev->dev);
1088 netdev->ethtool_ops = &ftmac100_ethtool_ops;
1089 netdev->netdev_ops = &ftmac100_netdev_ops;
1090
1091 platform_set_drvdata(pdev, netdev);
1092
1093 /* setup private data */
1094 priv = netdev_priv(netdev);
1095 priv->netdev = netdev;
1096 priv->dev = &pdev->dev;
1097
1098 spin_lock_init(&priv->tx_lock);
1099
1100 /* initialize NAPI */
1101 netif_napi_add(netdev, &priv->napi, ftmac100_poll, 64);
1102
1103 /* map io memory */
1104 priv->res = request_mem_region(res->start, resource_size(res),
1105 dev_name(&pdev->dev));
1106 if (!priv->res) {
1107 dev_err(&pdev->dev, "Could not reserve memory region\n");
1108 err = -ENOMEM;
1109 goto err_req_mem;
1110 }
1111
1112 priv->base = ioremap(res->start, resource_size(res));
1113 if (!priv->base) {
1114 dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
1115 err = -EIO;
1116 goto err_ioremap;
1117 }
1118
1119 priv->irq = irq;
1120
1121 /* initialize struct mii_if_info */
1122 priv->mii.phy_id = 0;
1123 priv->mii.phy_id_mask = 0x1f;
1124 priv->mii.reg_num_mask = 0x1f;
1125 priv->mii.dev = netdev;
1126 priv->mii.mdio_read = ftmac100_mdio_read;
1127 priv->mii.mdio_write = ftmac100_mdio_write;
1128
1129 /* register network device */
1130 err = register_netdev(netdev);
1131 if (err) {
1132 dev_err(&pdev->dev, "Failed to register netdev\n");
1133 goto err_register_netdev;
1134 }
1135
1136 netdev_info(netdev, "irq %d, mapped at %p\n", priv->irq, priv->base);
1137
1138 if (!is_valid_ether_addr(netdev->dev_addr)) {
1139 eth_hw_addr_random(netdev);
1140 netdev_info(netdev, "generated random MAC address %pM\n",
1141 netdev->dev_addr);
1142 }
1143
1144 return 0;
1145
1146 err_register_netdev:
1147 iounmap(priv->base);
1148 err_ioremap:
1149 release_resource(priv->res);
1150 err_req_mem:
1151 netif_napi_del(&priv->napi);
1152 free_netdev(netdev);
1153 err_alloc_etherdev:
1154 return err;
1155 }
1156
1157 static int __exit ftmac100_remove(struct platform_device *pdev)
1158 {
1159 struct net_device *netdev;
1160 struct ftmac100 *priv;
1161
1162 netdev = platform_get_drvdata(pdev);
1163 priv = netdev_priv(netdev);
1164
1165 unregister_netdev(netdev);
1166
1167 iounmap(priv->base);
1168 release_resource(priv->res);
1169
1170 netif_napi_del(&priv->napi);
1171 free_netdev(netdev);
1172 return 0;
1173 }
1174
1175 static struct platform_driver ftmac100_driver = {
1176 .probe = ftmac100_probe,
1177 .remove = __exit_p(ftmac100_remove),
1178 .driver = {
1179 .name = DRV_NAME,
1180 },
1181 };
1182
1183 /******************************************************************************
1184 * initialization / finalization
1185 *****************************************************************************/
1186 static int __init ftmac100_init(void)
1187 {
1188 pr_info("Loading version " DRV_VERSION " ...\n");
1189 return platform_driver_register(&ftmac100_driver);
1190 }
1191
1192 static void __exit ftmac100_exit(void)
1193 {
1194 platform_driver_unregister(&ftmac100_driver);
1195 }
1196
1197 module_init(ftmac100_init);
1198 module_exit(ftmac100_exit);
1199
1200 MODULE_AUTHOR("Po-Yu Chuang <ratbert@faraday-tech.com>");
1201 MODULE_DESCRIPTION("FTMAC100 driver");
1202 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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