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Merge tag 'led-fix-for-5.0-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-focal-kernel.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/mod_devicetable.h>
33 #include <linux/netdevice.h>
34 #include <linux/platform_device.h>
35
36 #include "ftmac100.h"
37
38 #define DRV_NAME "ftmac100"
39 #define DRV_VERSION "0.2"
40
41 #define RX_QUEUE_ENTRIES 128 /* must be power of 2 */
42 #define TX_QUEUE_ENTRIES 16 /* must be power of 2 */
43
44 #define MAX_PKT_SIZE 1518
45 #define RX_BUF_SIZE 2044 /* must be smaller than 0x7ff */
46
47 #if MAX_PKT_SIZE > 0x7ff
48 #error invalid MAX_PKT_SIZE
49 #endif
50
51 #if RX_BUF_SIZE > 0x7ff || RX_BUF_SIZE > PAGE_SIZE
52 #error invalid RX_BUF_SIZE
53 #endif
54
55 /******************************************************************************
56 * private data
57 *****************************************************************************/
58 struct ftmac100_descs {
59 struct ftmac100_rxdes rxdes[RX_QUEUE_ENTRIES];
60 struct ftmac100_txdes txdes[TX_QUEUE_ENTRIES];
61 };
62
63 struct ftmac100 {
64 struct resource *res;
65 void __iomem *base;
66 int irq;
67
68 struct ftmac100_descs *descs;
69 dma_addr_t descs_dma_addr;
70
71 unsigned int rx_pointer;
72 unsigned int tx_clean_pointer;
73 unsigned int tx_pointer;
74 unsigned int tx_pending;
75
76 spinlock_t tx_lock;
77
78 struct net_device *netdev;
79 struct device *dev;
80 struct napi_struct napi;
81
82 struct mii_if_info mii;
83 };
84
85 static int ftmac100_alloc_rx_page(struct ftmac100 *priv,
86 struct ftmac100_rxdes *rxdes, gfp_t gfp);
87
88 /******************************************************************************
89 * internal functions (hardware register access)
90 *****************************************************************************/
91 #define INT_MASK_ALL_ENABLED (FTMAC100_INT_RPKT_FINISH | \
92 FTMAC100_INT_NORXBUF | \
93 FTMAC100_INT_XPKT_OK | \
94 FTMAC100_INT_XPKT_LOST | \
95 FTMAC100_INT_RPKT_LOST | \
96 FTMAC100_INT_AHB_ERR | \
97 FTMAC100_INT_PHYSTS_CHG)
98
99 #define INT_MASK_ALL_DISABLED 0
100
101 static void ftmac100_enable_all_int(struct ftmac100 *priv)
102 {
103 iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTMAC100_OFFSET_IMR);
104 }
105
106 static void ftmac100_disable_all_int(struct ftmac100 *priv)
107 {
108 iowrite32(INT_MASK_ALL_DISABLED, priv->base + FTMAC100_OFFSET_IMR);
109 }
110
111 static void ftmac100_set_rx_ring_base(struct ftmac100 *priv, dma_addr_t addr)
112 {
113 iowrite32(addr, priv->base + FTMAC100_OFFSET_RXR_BADR);
114 }
115
116 static void ftmac100_set_tx_ring_base(struct ftmac100 *priv, dma_addr_t addr)
117 {
118 iowrite32(addr, priv->base + FTMAC100_OFFSET_TXR_BADR);
119 }
120
121 static void ftmac100_txdma_start_polling(struct ftmac100 *priv)
122 {
123 iowrite32(1, priv->base + FTMAC100_OFFSET_TXPD);
124 }
125
126 static int ftmac100_reset(struct ftmac100 *priv)
127 {
128 struct net_device *netdev = priv->netdev;
129 int i;
130
131 /* NOTE: reset clears all registers */
132 iowrite32(FTMAC100_MACCR_SW_RST, priv->base + FTMAC100_OFFSET_MACCR);
133
134 for (i = 0; i < 5; i++) {
135 unsigned int maccr;
136
137 maccr = ioread32(priv->base + FTMAC100_OFFSET_MACCR);
138 if (!(maccr & FTMAC100_MACCR_SW_RST)) {
139 /*
140 * FTMAC100_MACCR_SW_RST cleared does not indicate
141 * that hardware reset completed (what the f*ck).
142 * We still need to wait for a while.
143 */
144 udelay(500);
145 return 0;
146 }
147
148 udelay(1000);
149 }
150
151 netdev_err(netdev, "software reset failed\n");
152 return -EIO;
153 }
154
155 static void ftmac100_set_mac(struct ftmac100 *priv, const unsigned char *mac)
156 {
157 unsigned int maddr = mac[0] << 8 | mac[1];
158 unsigned int laddr = mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5];
159
160 iowrite32(maddr, priv->base + FTMAC100_OFFSET_MAC_MADR);
161 iowrite32(laddr, priv->base + FTMAC100_OFFSET_MAC_LADR);
162 }
163
164 #define MACCR_ENABLE_ALL (FTMAC100_MACCR_XMT_EN | \
165 FTMAC100_MACCR_RCV_EN | \
166 FTMAC100_MACCR_XDMA_EN | \
167 FTMAC100_MACCR_RDMA_EN | \
168 FTMAC100_MACCR_CRC_APD | \
169 FTMAC100_MACCR_FULLDUP | \
170 FTMAC100_MACCR_RX_RUNT | \
171 FTMAC100_MACCR_RX_BROADPKT)
172
173 static int ftmac100_start_hw(struct ftmac100 *priv)
174 {
175 struct net_device *netdev = priv->netdev;
176
177 if (ftmac100_reset(priv))
178 return -EIO;
179
180 /* setup ring buffer base registers */
181 ftmac100_set_rx_ring_base(priv,
182 priv->descs_dma_addr +
183 offsetof(struct ftmac100_descs, rxdes));
184 ftmac100_set_tx_ring_base(priv,
185 priv->descs_dma_addr +
186 offsetof(struct ftmac100_descs, txdes));
187
188 iowrite32(FTMAC100_APTC_RXPOLL_CNT(1), priv->base + FTMAC100_OFFSET_APTC);
189
190 ftmac100_set_mac(priv, netdev->dev_addr);
191
192 iowrite32(MACCR_ENABLE_ALL, priv->base + FTMAC100_OFFSET_MACCR);
193 return 0;
194 }
195
196 static void ftmac100_stop_hw(struct ftmac100 *priv)
197 {
198 iowrite32(0, priv->base + FTMAC100_OFFSET_MACCR);
199 }
200
201 /******************************************************************************
202 * internal functions (receive descriptor)
203 *****************************************************************************/
204 static bool ftmac100_rxdes_first_segment(struct ftmac100_rxdes *rxdes)
205 {
206 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_FRS);
207 }
208
209 static bool ftmac100_rxdes_last_segment(struct ftmac100_rxdes *rxdes)
210 {
211 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_LRS);
212 }
213
214 static bool ftmac100_rxdes_owned_by_dma(struct ftmac100_rxdes *rxdes)
215 {
216 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN);
217 }
218
219 static void ftmac100_rxdes_set_dma_own(struct ftmac100_rxdes *rxdes)
220 {
221 /* clear status bits */
222 rxdes->rxdes0 = cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN);
223 }
224
225 static bool ftmac100_rxdes_rx_error(struct ftmac100_rxdes *rxdes)
226 {
227 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ERR);
228 }
229
230 static bool ftmac100_rxdes_crc_error(struct ftmac100_rxdes *rxdes)
231 {
232 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_CRC_ERR);
233 }
234
235 static bool ftmac100_rxdes_frame_too_long(struct ftmac100_rxdes *rxdes)
236 {
237 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_FTL);
238 }
239
240 static bool ftmac100_rxdes_runt(struct ftmac100_rxdes *rxdes)
241 {
242 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RUNT);
243 }
244
245 static bool ftmac100_rxdes_odd_nibble(struct ftmac100_rxdes *rxdes)
246 {
247 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ODD_NB);
248 }
249
250 static unsigned int ftmac100_rxdes_frame_length(struct ftmac100_rxdes *rxdes)
251 {
252 return le32_to_cpu(rxdes->rxdes0) & FTMAC100_RXDES0_RFL;
253 }
254
255 static bool ftmac100_rxdes_multicast(struct ftmac100_rxdes *rxdes)
256 {
257 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_MULTICAST);
258 }
259
260 static void ftmac100_rxdes_set_buffer_size(struct ftmac100_rxdes *rxdes,
261 unsigned int size)
262 {
263 rxdes->rxdes1 &= cpu_to_le32(FTMAC100_RXDES1_EDORR);
264 rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_RXBUF_SIZE(size));
265 }
266
267 static void ftmac100_rxdes_set_end_of_ring(struct ftmac100_rxdes *rxdes)
268 {
269 rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_EDORR);
270 }
271
272 static void ftmac100_rxdes_set_dma_addr(struct ftmac100_rxdes *rxdes,
273 dma_addr_t addr)
274 {
275 rxdes->rxdes2 = cpu_to_le32(addr);
276 }
277
278 static dma_addr_t ftmac100_rxdes_get_dma_addr(struct ftmac100_rxdes *rxdes)
279 {
280 return le32_to_cpu(rxdes->rxdes2);
281 }
282
283 /*
284 * rxdes3 is not used by hardware. We use it to keep track of page.
285 * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
286 */
287 static void ftmac100_rxdes_set_page(struct ftmac100_rxdes *rxdes, struct page *page)
288 {
289 rxdes->rxdes3 = (unsigned int)page;
290 }
291
292 static struct page *ftmac100_rxdes_get_page(struct ftmac100_rxdes *rxdes)
293 {
294 return (struct page *)rxdes->rxdes3;
295 }
296
297 /******************************************************************************
298 * internal functions (receive)
299 *****************************************************************************/
300 static int ftmac100_next_rx_pointer(int pointer)
301 {
302 return (pointer + 1) & (RX_QUEUE_ENTRIES - 1);
303 }
304
305 static void ftmac100_rx_pointer_advance(struct ftmac100 *priv)
306 {
307 priv->rx_pointer = ftmac100_next_rx_pointer(priv->rx_pointer);
308 }
309
310 static struct ftmac100_rxdes *ftmac100_current_rxdes(struct ftmac100 *priv)
311 {
312 return &priv->descs->rxdes[priv->rx_pointer];
313 }
314
315 static struct ftmac100_rxdes *
316 ftmac100_rx_locate_first_segment(struct ftmac100 *priv)
317 {
318 struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv);
319
320 while (!ftmac100_rxdes_owned_by_dma(rxdes)) {
321 if (ftmac100_rxdes_first_segment(rxdes))
322 return rxdes;
323
324 ftmac100_rxdes_set_dma_own(rxdes);
325 ftmac100_rx_pointer_advance(priv);
326 rxdes = ftmac100_current_rxdes(priv);
327 }
328
329 return NULL;
330 }
331
332 static bool ftmac100_rx_packet_error(struct ftmac100 *priv,
333 struct ftmac100_rxdes *rxdes)
334 {
335 struct net_device *netdev = priv->netdev;
336 bool error = false;
337
338 if (unlikely(ftmac100_rxdes_rx_error(rxdes))) {
339 if (net_ratelimit())
340 netdev_info(netdev, "rx err\n");
341
342 netdev->stats.rx_errors++;
343 error = true;
344 }
345
346 if (unlikely(ftmac100_rxdes_crc_error(rxdes))) {
347 if (net_ratelimit())
348 netdev_info(netdev, "rx crc err\n");
349
350 netdev->stats.rx_crc_errors++;
351 error = true;
352 }
353
354 if (unlikely(ftmac100_rxdes_frame_too_long(rxdes))) {
355 if (net_ratelimit())
356 netdev_info(netdev, "rx frame too long\n");
357
358 netdev->stats.rx_length_errors++;
359 error = true;
360 } else if (unlikely(ftmac100_rxdes_runt(rxdes))) {
361 if (net_ratelimit())
362 netdev_info(netdev, "rx runt\n");
363
364 netdev->stats.rx_length_errors++;
365 error = true;
366 } else if (unlikely(ftmac100_rxdes_odd_nibble(rxdes))) {
367 if (net_ratelimit())
368 netdev_info(netdev, "rx odd nibble\n");
369
370 netdev->stats.rx_length_errors++;
371 error = true;
372 }
373
374 return error;
375 }
376
377 static void ftmac100_rx_drop_packet(struct ftmac100 *priv)
378 {
379 struct net_device *netdev = priv->netdev;
380 struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv);
381 bool done = false;
382
383 if (net_ratelimit())
384 netdev_dbg(netdev, "drop packet %p\n", rxdes);
385
386 do {
387 if (ftmac100_rxdes_last_segment(rxdes))
388 done = true;
389
390 ftmac100_rxdes_set_dma_own(rxdes);
391 ftmac100_rx_pointer_advance(priv);
392 rxdes = ftmac100_current_rxdes(priv);
393 } while (!done && !ftmac100_rxdes_owned_by_dma(rxdes));
394
395 netdev->stats.rx_dropped++;
396 }
397
398 static bool ftmac100_rx_packet(struct ftmac100 *priv, int *processed)
399 {
400 struct net_device *netdev = priv->netdev;
401 struct ftmac100_rxdes *rxdes;
402 struct sk_buff *skb;
403 struct page *page;
404 dma_addr_t map;
405 int length;
406 bool ret;
407
408 rxdes = ftmac100_rx_locate_first_segment(priv);
409 if (!rxdes)
410 return false;
411
412 if (unlikely(ftmac100_rx_packet_error(priv, rxdes))) {
413 ftmac100_rx_drop_packet(priv);
414 return true;
415 }
416
417 /*
418 * It is impossible to get multi-segment packets
419 * because we always provide big enough receive buffers.
420 */
421 ret = ftmac100_rxdes_last_segment(rxdes);
422 BUG_ON(!ret);
423
424 /* start processing */
425 skb = netdev_alloc_skb_ip_align(netdev, 128);
426 if (unlikely(!skb)) {
427 if (net_ratelimit())
428 netdev_err(netdev, "rx skb alloc failed\n");
429
430 ftmac100_rx_drop_packet(priv);
431 return true;
432 }
433
434 if (unlikely(ftmac100_rxdes_multicast(rxdes)))
435 netdev->stats.multicast++;
436
437 map = ftmac100_rxdes_get_dma_addr(rxdes);
438 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
439
440 length = ftmac100_rxdes_frame_length(rxdes);
441 page = ftmac100_rxdes_get_page(rxdes);
442 skb_fill_page_desc(skb, 0, page, 0, length);
443 skb->len += length;
444 skb->data_len += length;
445
446 if (length > 128) {
447 skb->truesize += PAGE_SIZE;
448 /* We pull the minimum amount into linear part */
449 __pskb_pull_tail(skb, ETH_HLEN);
450 } else {
451 /* Small frames are copied into linear part to free one page */
452 __pskb_pull_tail(skb, length);
453 }
454 ftmac100_alloc_rx_page(priv, rxdes, GFP_ATOMIC);
455
456 ftmac100_rx_pointer_advance(priv);
457
458 skb->protocol = eth_type_trans(skb, netdev);
459
460 netdev->stats.rx_packets++;
461 netdev->stats.rx_bytes += skb->len;
462
463 /* push packet to protocol stack */
464 netif_receive_skb(skb);
465
466 (*processed)++;
467 return true;
468 }
469
470 /******************************************************************************
471 * internal functions (transmit descriptor)
472 *****************************************************************************/
473 static void ftmac100_txdes_reset(struct ftmac100_txdes *txdes)
474 {
475 /* clear all except end of ring bit */
476 txdes->txdes0 = 0;
477 txdes->txdes1 &= cpu_to_le32(FTMAC100_TXDES1_EDOTR);
478 txdes->txdes2 = 0;
479 txdes->txdes3 = 0;
480 }
481
482 static bool ftmac100_txdes_owned_by_dma(struct ftmac100_txdes *txdes)
483 {
484 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN);
485 }
486
487 static void ftmac100_txdes_set_dma_own(struct ftmac100_txdes *txdes)
488 {
489 /*
490 * Make sure dma own bit will not be set before any other
491 * descriptor fields.
492 */
493 wmb();
494 txdes->txdes0 |= cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN);
495 }
496
497 static bool ftmac100_txdes_excessive_collision(struct ftmac100_txdes *txdes)
498 {
499 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_EXSCOL);
500 }
501
502 static bool ftmac100_txdes_late_collision(struct ftmac100_txdes *txdes)
503 {
504 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_LATECOL);
505 }
506
507 static void ftmac100_txdes_set_end_of_ring(struct ftmac100_txdes *txdes)
508 {
509 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_EDOTR);
510 }
511
512 static void ftmac100_txdes_set_first_segment(struct ftmac100_txdes *txdes)
513 {
514 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_FTS);
515 }
516
517 static void ftmac100_txdes_set_last_segment(struct ftmac100_txdes *txdes)
518 {
519 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_LTS);
520 }
521
522 static void ftmac100_txdes_set_txint(struct ftmac100_txdes *txdes)
523 {
524 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXIC);
525 }
526
527 static void ftmac100_txdes_set_buffer_size(struct ftmac100_txdes *txdes,
528 unsigned int len)
529 {
530 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXBUF_SIZE(len));
531 }
532
533 static void ftmac100_txdes_set_dma_addr(struct ftmac100_txdes *txdes,
534 dma_addr_t addr)
535 {
536 txdes->txdes2 = cpu_to_le32(addr);
537 }
538
539 static dma_addr_t ftmac100_txdes_get_dma_addr(struct ftmac100_txdes *txdes)
540 {
541 return le32_to_cpu(txdes->txdes2);
542 }
543
544 /*
545 * txdes3 is not used by hardware. We use it to keep track of socket buffer.
546 * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
547 */
548 static void ftmac100_txdes_set_skb(struct ftmac100_txdes *txdes, struct sk_buff *skb)
549 {
550 txdes->txdes3 = (unsigned int)skb;
551 }
552
553 static struct sk_buff *ftmac100_txdes_get_skb(struct ftmac100_txdes *txdes)
554 {
555 return (struct sk_buff *)txdes->txdes3;
556 }
557
558 /******************************************************************************
559 * internal functions (transmit)
560 *****************************************************************************/
561 static int ftmac100_next_tx_pointer(int pointer)
562 {
563 return (pointer + 1) & (TX_QUEUE_ENTRIES - 1);
564 }
565
566 static void ftmac100_tx_pointer_advance(struct ftmac100 *priv)
567 {
568 priv->tx_pointer = ftmac100_next_tx_pointer(priv->tx_pointer);
569 }
570
571 static void ftmac100_tx_clean_pointer_advance(struct ftmac100 *priv)
572 {
573 priv->tx_clean_pointer = ftmac100_next_tx_pointer(priv->tx_clean_pointer);
574 }
575
576 static struct ftmac100_txdes *ftmac100_current_txdes(struct ftmac100 *priv)
577 {
578 return &priv->descs->txdes[priv->tx_pointer];
579 }
580
581 static struct ftmac100_txdes *ftmac100_current_clean_txdes(struct ftmac100 *priv)
582 {
583 return &priv->descs->txdes[priv->tx_clean_pointer];
584 }
585
586 static bool ftmac100_tx_complete_packet(struct ftmac100 *priv)
587 {
588 struct net_device *netdev = priv->netdev;
589 struct ftmac100_txdes *txdes;
590 struct sk_buff *skb;
591 dma_addr_t map;
592
593 if (priv->tx_pending == 0)
594 return false;
595
596 txdes = ftmac100_current_clean_txdes(priv);
597
598 if (ftmac100_txdes_owned_by_dma(txdes))
599 return false;
600
601 skb = ftmac100_txdes_get_skb(txdes);
602 map = ftmac100_txdes_get_dma_addr(txdes);
603
604 if (unlikely(ftmac100_txdes_excessive_collision(txdes) ||
605 ftmac100_txdes_late_collision(txdes))) {
606 /*
607 * packet transmitted to ethernet lost due to late collision
608 * or excessive collision
609 */
610 netdev->stats.tx_aborted_errors++;
611 } else {
612 netdev->stats.tx_packets++;
613 netdev->stats.tx_bytes += skb->len;
614 }
615
616 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
617 dev_kfree_skb(skb);
618
619 ftmac100_txdes_reset(txdes);
620
621 ftmac100_tx_clean_pointer_advance(priv);
622
623 spin_lock(&priv->tx_lock);
624 priv->tx_pending--;
625 spin_unlock(&priv->tx_lock);
626 netif_wake_queue(netdev);
627
628 return true;
629 }
630
631 static void ftmac100_tx_complete(struct ftmac100 *priv)
632 {
633 while (ftmac100_tx_complete_packet(priv))
634 ;
635 }
636
637 static netdev_tx_t ftmac100_xmit(struct ftmac100 *priv, struct sk_buff *skb,
638 dma_addr_t map)
639 {
640 struct net_device *netdev = priv->netdev;
641 struct ftmac100_txdes *txdes;
642 unsigned int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
643
644 txdes = ftmac100_current_txdes(priv);
645 ftmac100_tx_pointer_advance(priv);
646
647 /* setup TX descriptor */
648 ftmac100_txdes_set_skb(txdes, skb);
649 ftmac100_txdes_set_dma_addr(txdes, map);
650
651 ftmac100_txdes_set_first_segment(txdes);
652 ftmac100_txdes_set_last_segment(txdes);
653 ftmac100_txdes_set_txint(txdes);
654 ftmac100_txdes_set_buffer_size(txdes, len);
655
656 spin_lock(&priv->tx_lock);
657 priv->tx_pending++;
658 if (priv->tx_pending == TX_QUEUE_ENTRIES)
659 netif_stop_queue(netdev);
660
661 /* start transmit */
662 ftmac100_txdes_set_dma_own(txdes);
663 spin_unlock(&priv->tx_lock);
664
665 ftmac100_txdma_start_polling(priv);
666 return NETDEV_TX_OK;
667 }
668
669 /******************************************************************************
670 * internal functions (buffer)
671 *****************************************************************************/
672 static int ftmac100_alloc_rx_page(struct ftmac100 *priv,
673 struct ftmac100_rxdes *rxdes, gfp_t gfp)
674 {
675 struct net_device *netdev = priv->netdev;
676 struct page *page;
677 dma_addr_t map;
678
679 page = alloc_page(gfp);
680 if (!page) {
681 if (net_ratelimit())
682 netdev_err(netdev, "failed to allocate rx page\n");
683 return -ENOMEM;
684 }
685
686 map = dma_map_page(priv->dev, page, 0, RX_BUF_SIZE, DMA_FROM_DEVICE);
687 if (unlikely(dma_mapping_error(priv->dev, map))) {
688 if (net_ratelimit())
689 netdev_err(netdev, "failed to map rx page\n");
690 __free_page(page);
691 return -ENOMEM;
692 }
693
694 ftmac100_rxdes_set_page(rxdes, page);
695 ftmac100_rxdes_set_dma_addr(rxdes, map);
696 ftmac100_rxdes_set_buffer_size(rxdes, RX_BUF_SIZE);
697 ftmac100_rxdes_set_dma_own(rxdes);
698 return 0;
699 }
700
701 static void ftmac100_free_buffers(struct ftmac100 *priv)
702 {
703 int i;
704
705 for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
706 struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i];
707 struct page *page = ftmac100_rxdes_get_page(rxdes);
708 dma_addr_t map = ftmac100_rxdes_get_dma_addr(rxdes);
709
710 if (!page)
711 continue;
712
713 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
714 __free_page(page);
715 }
716
717 for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
718 struct ftmac100_txdes *txdes = &priv->descs->txdes[i];
719 struct sk_buff *skb = ftmac100_txdes_get_skb(txdes);
720 dma_addr_t map = ftmac100_txdes_get_dma_addr(txdes);
721
722 if (!skb)
723 continue;
724
725 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
726 dev_kfree_skb(skb);
727 }
728
729 dma_free_coherent(priv->dev, sizeof(struct ftmac100_descs),
730 priv->descs, priv->descs_dma_addr);
731 }
732
733 static int ftmac100_alloc_buffers(struct ftmac100 *priv)
734 {
735 int i;
736
737 priv->descs = dma_alloc_coherent(priv->dev,
738 sizeof(struct ftmac100_descs),
739 &priv->descs_dma_addr, GFP_KERNEL);
740 if (!priv->descs)
741 return -ENOMEM;
742
743 /* initialize RX ring */
744 ftmac100_rxdes_set_end_of_ring(&priv->descs->rxdes[RX_QUEUE_ENTRIES - 1]);
745
746 for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
747 struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i];
748
749 if (ftmac100_alloc_rx_page(priv, rxdes, GFP_KERNEL))
750 goto err;
751 }
752
753 /* initialize TX ring */
754 ftmac100_txdes_set_end_of_ring(&priv->descs->txdes[TX_QUEUE_ENTRIES - 1]);
755 return 0;
756
757 err:
758 ftmac100_free_buffers(priv);
759 return -ENOMEM;
760 }
761
762 /******************************************************************************
763 * struct mii_if_info functions
764 *****************************************************************************/
765 static int ftmac100_mdio_read(struct net_device *netdev, int phy_id, int reg)
766 {
767 struct ftmac100 *priv = netdev_priv(netdev);
768 unsigned int phycr;
769 int i;
770
771 phycr = FTMAC100_PHYCR_PHYAD(phy_id) |
772 FTMAC100_PHYCR_REGAD(reg) |
773 FTMAC100_PHYCR_MIIRD;
774
775 iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR);
776
777 for (i = 0; i < 10; i++) {
778 phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR);
779
780 if ((phycr & FTMAC100_PHYCR_MIIRD) == 0)
781 return phycr & FTMAC100_PHYCR_MIIRDATA;
782
783 udelay(100);
784 }
785
786 netdev_err(netdev, "mdio read timed out\n");
787 return 0;
788 }
789
790 static void ftmac100_mdio_write(struct net_device *netdev, int phy_id, int reg,
791 int data)
792 {
793 struct ftmac100 *priv = netdev_priv(netdev);
794 unsigned int phycr;
795 int i;
796
797 phycr = FTMAC100_PHYCR_PHYAD(phy_id) |
798 FTMAC100_PHYCR_REGAD(reg) |
799 FTMAC100_PHYCR_MIIWR;
800
801 data = FTMAC100_PHYWDATA_MIIWDATA(data);
802
803 iowrite32(data, priv->base + FTMAC100_OFFSET_PHYWDATA);
804 iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR);
805
806 for (i = 0; i < 10; i++) {
807 phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR);
808
809 if ((phycr & FTMAC100_PHYCR_MIIWR) == 0)
810 return;
811
812 udelay(100);
813 }
814
815 netdev_err(netdev, "mdio write timed out\n");
816 }
817
818 /******************************************************************************
819 * struct ethtool_ops functions
820 *****************************************************************************/
821 static void ftmac100_get_drvinfo(struct net_device *netdev,
822 struct ethtool_drvinfo *info)
823 {
824 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
825 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
826 strlcpy(info->bus_info, dev_name(&netdev->dev), sizeof(info->bus_info));
827 }
828
829 static int ftmac100_get_link_ksettings(struct net_device *netdev,
830 struct ethtool_link_ksettings *cmd)
831 {
832 struct ftmac100 *priv = netdev_priv(netdev);
833
834 mii_ethtool_get_link_ksettings(&priv->mii, cmd);
835
836 return 0;
837 }
838
839 static int ftmac100_set_link_ksettings(struct net_device *netdev,
840 const struct ethtool_link_ksettings *cmd)
841 {
842 struct ftmac100 *priv = netdev_priv(netdev);
843 return mii_ethtool_set_link_ksettings(&priv->mii, cmd);
844 }
845
846 static int ftmac100_nway_reset(struct net_device *netdev)
847 {
848 struct ftmac100 *priv = netdev_priv(netdev);
849 return mii_nway_restart(&priv->mii);
850 }
851
852 static u32 ftmac100_get_link(struct net_device *netdev)
853 {
854 struct ftmac100 *priv = netdev_priv(netdev);
855 return mii_link_ok(&priv->mii);
856 }
857
858 static const struct ethtool_ops ftmac100_ethtool_ops = {
859 .get_drvinfo = ftmac100_get_drvinfo,
860 .nway_reset = ftmac100_nway_reset,
861 .get_link = ftmac100_get_link,
862 .get_link_ksettings = ftmac100_get_link_ksettings,
863 .set_link_ksettings = ftmac100_set_link_ksettings,
864 };
865
866 /******************************************************************************
867 * interrupt handler
868 *****************************************************************************/
869 static irqreturn_t ftmac100_interrupt(int irq, void *dev_id)
870 {
871 struct net_device *netdev = dev_id;
872 struct ftmac100 *priv = netdev_priv(netdev);
873
874 /* Disable interrupts for polling */
875 ftmac100_disable_all_int(priv);
876 if (likely(netif_running(netdev)))
877 napi_schedule(&priv->napi);
878
879 return IRQ_HANDLED;
880 }
881
882 /******************************************************************************
883 * struct napi_struct functions
884 *****************************************************************************/
885 static int ftmac100_poll(struct napi_struct *napi, int budget)
886 {
887 struct ftmac100 *priv = container_of(napi, struct ftmac100, napi);
888 struct net_device *netdev = priv->netdev;
889 unsigned int status;
890 bool completed = true;
891 int rx = 0;
892
893 status = ioread32(priv->base + FTMAC100_OFFSET_ISR);
894
895 if (status & (FTMAC100_INT_RPKT_FINISH | FTMAC100_INT_NORXBUF)) {
896 /*
897 * FTMAC100_INT_RPKT_FINISH:
898 * RX DMA has received packets into RX buffer successfully
899 *
900 * FTMAC100_INT_NORXBUF:
901 * RX buffer unavailable
902 */
903 bool retry;
904
905 do {
906 retry = ftmac100_rx_packet(priv, &rx);
907 } while (retry && rx < budget);
908
909 if (retry && rx == budget)
910 completed = false;
911 }
912
913 if (status & (FTMAC100_INT_XPKT_OK | FTMAC100_INT_XPKT_LOST)) {
914 /*
915 * FTMAC100_INT_XPKT_OK:
916 * packet transmitted to ethernet successfully
917 *
918 * FTMAC100_INT_XPKT_LOST:
919 * packet transmitted to ethernet lost due to late
920 * collision or excessive collision
921 */
922 ftmac100_tx_complete(priv);
923 }
924
925 if (status & (FTMAC100_INT_NORXBUF | FTMAC100_INT_RPKT_LOST |
926 FTMAC100_INT_AHB_ERR | FTMAC100_INT_PHYSTS_CHG)) {
927 if (net_ratelimit())
928 netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status,
929 status & FTMAC100_INT_NORXBUF ? "NORXBUF " : "",
930 status & FTMAC100_INT_RPKT_LOST ? "RPKT_LOST " : "",
931 status & FTMAC100_INT_AHB_ERR ? "AHB_ERR " : "",
932 status & FTMAC100_INT_PHYSTS_CHG ? "PHYSTS_CHG" : "");
933
934 if (status & FTMAC100_INT_NORXBUF) {
935 /* RX buffer unavailable */
936 netdev->stats.rx_over_errors++;
937 }
938
939 if (status & FTMAC100_INT_RPKT_LOST) {
940 /* received packet lost due to RX FIFO full */
941 netdev->stats.rx_fifo_errors++;
942 }
943
944 if (status & FTMAC100_INT_PHYSTS_CHG) {
945 /* PHY link status change */
946 mii_check_link(&priv->mii);
947 }
948 }
949
950 if (completed) {
951 /* stop polling */
952 napi_complete(napi);
953 ftmac100_enable_all_int(priv);
954 }
955
956 return rx;
957 }
958
959 /******************************************************************************
960 * struct net_device_ops functions
961 *****************************************************************************/
962 static int ftmac100_open(struct net_device *netdev)
963 {
964 struct ftmac100 *priv = netdev_priv(netdev);
965 int err;
966
967 err = ftmac100_alloc_buffers(priv);
968 if (err) {
969 netdev_err(netdev, "failed to allocate buffers\n");
970 goto err_alloc;
971 }
972
973 err = request_irq(priv->irq, ftmac100_interrupt, 0, netdev->name, netdev);
974 if (err) {
975 netdev_err(netdev, "failed to request irq %d\n", priv->irq);
976 goto err_irq;
977 }
978
979 priv->rx_pointer = 0;
980 priv->tx_clean_pointer = 0;
981 priv->tx_pointer = 0;
982 priv->tx_pending = 0;
983
984 err = ftmac100_start_hw(priv);
985 if (err)
986 goto err_hw;
987
988 napi_enable(&priv->napi);
989 netif_start_queue(netdev);
990
991 ftmac100_enable_all_int(priv);
992
993 return 0;
994
995 err_hw:
996 free_irq(priv->irq, netdev);
997 err_irq:
998 ftmac100_free_buffers(priv);
999 err_alloc:
1000 return err;
1001 }
1002
1003 static int ftmac100_stop(struct net_device *netdev)
1004 {
1005 struct ftmac100 *priv = netdev_priv(netdev);
1006
1007 ftmac100_disable_all_int(priv);
1008 netif_stop_queue(netdev);
1009 napi_disable(&priv->napi);
1010 ftmac100_stop_hw(priv);
1011 free_irq(priv->irq, netdev);
1012 ftmac100_free_buffers(priv);
1013
1014 return 0;
1015 }
1016
1017 static netdev_tx_t
1018 ftmac100_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev)
1019 {
1020 struct ftmac100 *priv = netdev_priv(netdev);
1021 dma_addr_t map;
1022
1023 if (unlikely(skb->len > MAX_PKT_SIZE)) {
1024 if (net_ratelimit())
1025 netdev_dbg(netdev, "tx packet too big\n");
1026
1027 netdev->stats.tx_dropped++;
1028 dev_kfree_skb(skb);
1029 return NETDEV_TX_OK;
1030 }
1031
1032 map = dma_map_single(priv->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
1033 if (unlikely(dma_mapping_error(priv->dev, map))) {
1034 /* drop packet */
1035 if (net_ratelimit())
1036 netdev_err(netdev, "map socket buffer failed\n");
1037
1038 netdev->stats.tx_dropped++;
1039 dev_kfree_skb(skb);
1040 return NETDEV_TX_OK;
1041 }
1042
1043 return ftmac100_xmit(priv, skb, map);
1044 }
1045
1046 /* optional */
1047 static int ftmac100_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
1048 {
1049 struct ftmac100 *priv = netdev_priv(netdev);
1050 struct mii_ioctl_data *data = if_mii(ifr);
1051
1052 return generic_mii_ioctl(&priv->mii, data, cmd, NULL);
1053 }
1054
1055 static const struct net_device_ops ftmac100_netdev_ops = {
1056 .ndo_open = ftmac100_open,
1057 .ndo_stop = ftmac100_stop,
1058 .ndo_start_xmit = ftmac100_hard_start_xmit,
1059 .ndo_set_mac_address = eth_mac_addr,
1060 .ndo_validate_addr = eth_validate_addr,
1061 .ndo_do_ioctl = ftmac100_do_ioctl,
1062 };
1063
1064 /******************************************************************************
1065 * struct platform_driver functions
1066 *****************************************************************************/
1067 static int ftmac100_probe(struct platform_device *pdev)
1068 {
1069 struct resource *res;
1070 int irq;
1071 struct net_device *netdev;
1072 struct ftmac100 *priv;
1073 int err;
1074
1075 if (!pdev)
1076 return -ENODEV;
1077
1078 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1079 if (!res)
1080 return -ENXIO;
1081
1082 irq = platform_get_irq(pdev, 0);
1083 if (irq < 0)
1084 return irq;
1085
1086 /* setup net_device */
1087 netdev = alloc_etherdev(sizeof(*priv));
1088 if (!netdev) {
1089 err = -ENOMEM;
1090 goto err_alloc_etherdev;
1091 }
1092
1093 SET_NETDEV_DEV(netdev, &pdev->dev);
1094 netdev->ethtool_ops = &ftmac100_ethtool_ops;
1095 netdev->netdev_ops = &ftmac100_netdev_ops;
1096
1097 platform_set_drvdata(pdev, netdev);
1098
1099 /* setup private data */
1100 priv = netdev_priv(netdev);
1101 priv->netdev = netdev;
1102 priv->dev = &pdev->dev;
1103
1104 spin_lock_init(&priv->tx_lock);
1105
1106 /* initialize NAPI */
1107 netif_napi_add(netdev, &priv->napi, ftmac100_poll, 64);
1108
1109 /* map io memory */
1110 priv->res = request_mem_region(res->start, resource_size(res),
1111 dev_name(&pdev->dev));
1112 if (!priv->res) {
1113 dev_err(&pdev->dev, "Could not reserve memory region\n");
1114 err = -ENOMEM;
1115 goto err_req_mem;
1116 }
1117
1118 priv->base = ioremap(res->start, resource_size(res));
1119 if (!priv->base) {
1120 dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
1121 err = -EIO;
1122 goto err_ioremap;
1123 }
1124
1125 priv->irq = irq;
1126
1127 /* initialize struct mii_if_info */
1128 priv->mii.phy_id = 0;
1129 priv->mii.phy_id_mask = 0x1f;
1130 priv->mii.reg_num_mask = 0x1f;
1131 priv->mii.dev = netdev;
1132 priv->mii.mdio_read = ftmac100_mdio_read;
1133 priv->mii.mdio_write = ftmac100_mdio_write;
1134
1135 /* register network device */
1136 err = register_netdev(netdev);
1137 if (err) {
1138 dev_err(&pdev->dev, "Failed to register netdev\n");
1139 goto err_register_netdev;
1140 }
1141
1142 netdev_info(netdev, "irq %d, mapped at %p\n", priv->irq, priv->base);
1143
1144 if (!is_valid_ether_addr(netdev->dev_addr)) {
1145 eth_hw_addr_random(netdev);
1146 netdev_info(netdev, "generated random MAC address %pM\n",
1147 netdev->dev_addr);
1148 }
1149
1150 return 0;
1151
1152 err_register_netdev:
1153 iounmap(priv->base);
1154 err_ioremap:
1155 release_resource(priv->res);
1156 err_req_mem:
1157 netif_napi_del(&priv->napi);
1158 free_netdev(netdev);
1159 err_alloc_etherdev:
1160 return err;
1161 }
1162
1163 static int ftmac100_remove(struct platform_device *pdev)
1164 {
1165 struct net_device *netdev;
1166 struct ftmac100 *priv;
1167
1168 netdev = platform_get_drvdata(pdev);
1169 priv = netdev_priv(netdev);
1170
1171 unregister_netdev(netdev);
1172
1173 iounmap(priv->base);
1174 release_resource(priv->res);
1175
1176 netif_napi_del(&priv->napi);
1177 free_netdev(netdev);
1178 return 0;
1179 }
1180
1181 static const struct of_device_id ftmac100_of_ids[] = {
1182 { .compatible = "andestech,atmac100" },
1183 { }
1184 };
1185
1186 static struct platform_driver ftmac100_driver = {
1187 .probe = ftmac100_probe,
1188 .remove = ftmac100_remove,
1189 .driver = {
1190 .name = DRV_NAME,
1191 .of_match_table = ftmac100_of_ids
1192 },
1193 };
1194
1195 /******************************************************************************
1196 * initialization / finalization
1197 *****************************************************************************/
1198 static int __init ftmac100_init(void)
1199 {
1200 pr_info("Loading version " DRV_VERSION " ...\n");
1201 return platform_driver_register(&ftmac100_driver);
1202 }
1203
1204 static void __exit ftmac100_exit(void)
1205 {
1206 platform_driver_unregister(&ftmac100_driver);
1207 }
1208
1209 module_init(ftmac100_init);
1210 module_exit(ftmac100_exit);
1211
1212 MODULE_AUTHOR("Po-Yu Chuang <ratbert@faraday-tech.com>");
1213 MODULE_DESCRIPTION("FTMAC100 driver");
1214 MODULE_LICENSE("GPL");
1215 MODULE_DEVICE_TABLE(of, ftmac100_of_ids);
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