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ar71xx: improve rx performance of the ethernet driver by using build_skb to deliver...
[openwrt/openwrt.git] / target / linux / ar71xx / files / drivers / net / ethernet / atheros / ag71xx / ag71xx_main.c
1 /*
2 * Atheros AR71xx built-in ethernet mac driver
3 *
4 * Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
6 *
7 * Based on Atheros' AG7100 driver
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License version 2 as published
11 * by the Free Software Foundation.
12 */
13
14 #include "ag71xx.h"
15
16 #define AG71XX_DEFAULT_MSG_ENABLE \
17 (NETIF_MSG_DRV \
18 | NETIF_MSG_PROBE \
19 | NETIF_MSG_LINK \
20 | NETIF_MSG_TIMER \
21 | NETIF_MSG_IFDOWN \
22 | NETIF_MSG_IFUP \
23 | NETIF_MSG_RX_ERR \
24 | NETIF_MSG_TX_ERR)
25
26 static int ag71xx_msg_level = -1;
27
28 module_param_named(msg_level, ag71xx_msg_level, int, 0);
29 MODULE_PARM_DESC(msg_level, "Message level (-1=defaults,0=none,...,16=all)");
30
31 static void ag71xx_dump_dma_regs(struct ag71xx *ag)
32 {
33 DBG("%s: dma_tx_ctrl=%08x, dma_tx_desc=%08x, dma_tx_status=%08x\n",
34 ag->dev->name,
35 ag71xx_rr(ag, AG71XX_REG_TX_CTRL),
36 ag71xx_rr(ag, AG71XX_REG_TX_DESC),
37 ag71xx_rr(ag, AG71XX_REG_TX_STATUS));
38
39 DBG("%s: dma_rx_ctrl=%08x, dma_rx_desc=%08x, dma_rx_status=%08x\n",
40 ag->dev->name,
41 ag71xx_rr(ag, AG71XX_REG_RX_CTRL),
42 ag71xx_rr(ag, AG71XX_REG_RX_DESC),
43 ag71xx_rr(ag, AG71XX_REG_RX_STATUS));
44 }
45
46 static void ag71xx_dump_regs(struct ag71xx *ag)
47 {
48 DBG("%s: mac_cfg1=%08x, mac_cfg2=%08x, ipg=%08x, hdx=%08x, mfl=%08x\n",
49 ag->dev->name,
50 ag71xx_rr(ag, AG71XX_REG_MAC_CFG1),
51 ag71xx_rr(ag, AG71XX_REG_MAC_CFG2),
52 ag71xx_rr(ag, AG71XX_REG_MAC_IPG),
53 ag71xx_rr(ag, AG71XX_REG_MAC_HDX),
54 ag71xx_rr(ag, AG71XX_REG_MAC_MFL));
55 DBG("%s: mac_ifctl=%08x, mac_addr1=%08x, mac_addr2=%08x\n",
56 ag->dev->name,
57 ag71xx_rr(ag, AG71XX_REG_MAC_IFCTL),
58 ag71xx_rr(ag, AG71XX_REG_MAC_ADDR1),
59 ag71xx_rr(ag, AG71XX_REG_MAC_ADDR2));
60 DBG("%s: fifo_cfg0=%08x, fifo_cfg1=%08x, fifo_cfg2=%08x\n",
61 ag->dev->name,
62 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG0),
63 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG1),
64 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG2));
65 DBG("%s: fifo_cfg3=%08x, fifo_cfg4=%08x, fifo_cfg5=%08x\n",
66 ag->dev->name,
67 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG3),
68 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG4),
69 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG5));
70 }
71
72 static inline void ag71xx_dump_intr(struct ag71xx *ag, char *label, u32 intr)
73 {
74 DBG("%s: %s intr=%08x %s%s%s%s%s%s\n",
75 ag->dev->name, label, intr,
76 (intr & AG71XX_INT_TX_PS) ? "TXPS " : "",
77 (intr & AG71XX_INT_TX_UR) ? "TXUR " : "",
78 (intr & AG71XX_INT_TX_BE) ? "TXBE " : "",
79 (intr & AG71XX_INT_RX_PR) ? "RXPR " : "",
80 (intr & AG71XX_INT_RX_OF) ? "RXOF " : "",
81 (intr & AG71XX_INT_RX_BE) ? "RXBE " : "");
82 }
83
84 static void ag71xx_ring_free(struct ag71xx_ring *ring)
85 {
86 kfree(ring->buf);
87
88 if (ring->descs_cpu)
89 dma_free_coherent(NULL, ring->size * ring->desc_size,
90 ring->descs_cpu, ring->descs_dma);
91 }
92
93 static int ag71xx_ring_alloc(struct ag71xx_ring *ring)
94 {
95 int err;
96 int i;
97
98 ring->desc_size = sizeof(struct ag71xx_desc);
99 if (ring->desc_size % cache_line_size()) {
100 DBG("ag71xx: ring %p, desc size %u rounded to %u\n",
101 ring, ring->desc_size,
102 roundup(ring->desc_size, cache_line_size()));
103 ring->desc_size = roundup(ring->desc_size, cache_line_size());
104 }
105
106 ring->descs_cpu = dma_alloc_coherent(NULL, ring->size * ring->desc_size,
107 &ring->descs_dma, GFP_ATOMIC);
108 if (!ring->descs_cpu) {
109 err = -ENOMEM;
110 goto err;
111 }
112
113
114 ring->buf = kzalloc(ring->size * sizeof(*ring->buf), GFP_KERNEL);
115 if (!ring->buf) {
116 err = -ENOMEM;
117 goto err;
118 }
119
120 for (i = 0; i < ring->size; i++) {
121 int idx = i * ring->desc_size;
122 ring->buf[i].desc = (struct ag71xx_desc *)&ring->descs_cpu[idx];
123 DBG("ag71xx: ring %p, desc %d at %p\n",
124 ring, i, ring->buf[i].desc);
125 }
126
127 return 0;
128
129 err:
130 return err;
131 }
132
133 static void ag71xx_ring_tx_clean(struct ag71xx *ag)
134 {
135 struct ag71xx_ring *ring = &ag->tx_ring;
136 struct net_device *dev = ag->dev;
137 u32 bytes_compl = 0, pkts_compl = 0;
138
139 while (ring->curr != ring->dirty) {
140 u32 i = ring->dirty % ring->size;
141
142 if (!ag71xx_desc_empty(ring->buf[i].desc)) {
143 ring->buf[i].desc->ctrl = 0;
144 dev->stats.tx_errors++;
145 }
146
147 if (ring->buf[i].skb) {
148 bytes_compl += ring->buf[i].skb->len;
149 pkts_compl++;
150 dev_kfree_skb_any(ring->buf[i].skb);
151 }
152 ring->buf[i].skb = NULL;
153 ring->dirty++;
154 }
155
156 /* flush descriptors */
157 wmb();
158
159 netdev_completed_queue(dev, pkts_compl, bytes_compl);
160 }
161
162 static void ag71xx_ring_tx_init(struct ag71xx *ag)
163 {
164 struct ag71xx_ring *ring = &ag->tx_ring;
165 int i;
166
167 for (i = 0; i < ring->size; i++) {
168 ring->buf[i].desc->next = (u32) (ring->descs_dma +
169 ring->desc_size * ((i + 1) % ring->size));
170
171 ring->buf[i].desc->ctrl = DESC_EMPTY;
172 ring->buf[i].skb = NULL;
173 }
174
175 /* flush descriptors */
176 wmb();
177
178 ring->curr = 0;
179 ring->dirty = 0;
180 netdev_reset_queue(ag->dev);
181 }
182
183 static void ag71xx_ring_rx_clean(struct ag71xx *ag)
184 {
185 struct ag71xx_ring *ring = &ag->rx_ring;
186 int i;
187
188 if (!ring->buf)
189 return;
190
191 for (i = 0; i < ring->size; i++)
192 if (ring->buf[i].rx_buf) {
193 dma_unmap_single(&ag->dev->dev, ring->buf[i].dma_addr,
194 AG71XX_RX_BUF_SIZE, DMA_FROM_DEVICE);
195 kfree(ring->buf[i].rx_buf);
196 }
197 }
198
199 static int ag71xx_buffer_offset(struct ag71xx *ag)
200 {
201 int offset = NET_SKB_PAD;
202
203 /*
204 * On AR71xx/AR91xx packets must be 4-byte aligned.
205 *
206 * When using builtin AR8216 support, hardware adds a 2-byte header,
207 * so we don't need any extra alignment in that case.
208 */
209 if (!ag71xx_get_pdata(ag)->is_ar724x || ag71xx_has_ar8216(ag))
210 return offset;
211
212 return offset + NET_IP_ALIGN;
213 }
214
215 static bool ag71xx_fill_rx_buf(struct ag71xx *ag, struct ag71xx_buf *buf,
216 int offset)
217 {
218 void *data;
219
220 data = kmalloc(AG71XX_RX_BUF_SIZE +
221 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)),
222 GFP_ATOMIC);
223 if (!data)
224 return false;
225
226 buf->rx_buf = data;
227 buf->dma_addr = dma_map_single(&ag->dev->dev, data,
228 AG71XX_RX_BUF_SIZE, DMA_FROM_DEVICE);
229 buf->desc->data = (u32) buf->dma_addr + offset;
230 return true;
231 }
232
233 static int ag71xx_ring_rx_init(struct ag71xx *ag)
234 {
235 struct ag71xx_ring *ring = &ag->rx_ring;
236 unsigned int i;
237 int ret;
238 int offset = ag71xx_buffer_offset(ag);
239
240 ret = 0;
241 for (i = 0; i < ring->size; i++) {
242 ring->buf[i].desc->next = (u32) (ring->descs_dma +
243 ring->desc_size * ((i + 1) % ring->size));
244
245 DBG("ag71xx: RX desc at %p, next is %08x\n",
246 ring->buf[i].desc,
247 ring->buf[i].desc->next);
248 }
249
250 for (i = 0; i < ring->size; i++) {
251 if (!ag71xx_fill_rx_buf(ag, &ring->buf[i], offset)) {
252 ret = -ENOMEM;
253 break;
254 }
255
256 ring->buf[i].desc->ctrl = DESC_EMPTY;
257 }
258
259 /* flush descriptors */
260 wmb();
261
262 ring->curr = 0;
263 ring->dirty = 0;
264
265 return ret;
266 }
267
268 static int ag71xx_ring_rx_refill(struct ag71xx *ag)
269 {
270 struct ag71xx_ring *ring = &ag->rx_ring;
271 unsigned int count;
272 int offset = ag71xx_buffer_offset(ag);
273
274 count = 0;
275 for (; ring->curr - ring->dirty > 0; ring->dirty++) {
276 unsigned int i;
277
278 i = ring->dirty % ring->size;
279
280 if (!ring->buf[i].rx_buf &&
281 !ag71xx_fill_rx_buf(ag, &ring->buf[i], offset))
282 break;
283
284 ring->buf[i].desc->ctrl = DESC_EMPTY;
285 count++;
286 }
287
288 /* flush descriptors */
289 wmb();
290
291 DBG("%s: %u rx descriptors refilled\n", ag->dev->name, count);
292
293 return count;
294 }
295
296 static int ag71xx_rings_init(struct ag71xx *ag)
297 {
298 int ret;
299
300 ret = ag71xx_ring_alloc(&ag->tx_ring);
301 if (ret)
302 return ret;
303
304 ag71xx_ring_tx_init(ag);
305
306 ret = ag71xx_ring_alloc(&ag->rx_ring);
307 if (ret)
308 return ret;
309
310 ret = ag71xx_ring_rx_init(ag);
311 return ret;
312 }
313
314 static void ag71xx_rings_cleanup(struct ag71xx *ag)
315 {
316 ag71xx_ring_rx_clean(ag);
317 ag71xx_ring_free(&ag->rx_ring);
318
319 ag71xx_ring_tx_clean(ag);
320 netdev_reset_queue(ag->dev);
321 ag71xx_ring_free(&ag->tx_ring);
322 }
323
324 static unsigned char *ag71xx_speed_str(struct ag71xx *ag)
325 {
326 switch (ag->speed) {
327 case SPEED_1000:
328 return "1000";
329 case SPEED_100:
330 return "100";
331 case SPEED_10:
332 return "10";
333 }
334
335 return "?";
336 }
337
338 static void ag71xx_hw_set_macaddr(struct ag71xx *ag, unsigned char *mac)
339 {
340 u32 t;
341
342 t = (((u32) mac[5]) << 24) | (((u32) mac[4]) << 16)
343 | (((u32) mac[3]) << 8) | ((u32) mac[2]);
344
345 ag71xx_wr(ag, AG71XX_REG_MAC_ADDR1, t);
346
347 t = (((u32) mac[1]) << 24) | (((u32) mac[0]) << 16);
348 ag71xx_wr(ag, AG71XX_REG_MAC_ADDR2, t);
349 }
350
351 static void ag71xx_dma_reset(struct ag71xx *ag)
352 {
353 u32 val;
354 int i;
355
356 ag71xx_dump_dma_regs(ag);
357
358 /* stop RX and TX */
359 ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
360 ag71xx_wr(ag, AG71XX_REG_TX_CTRL, 0);
361
362 /*
363 * give the hardware some time to really stop all rx/tx activity
364 * clearing the descriptors too early causes random memory corruption
365 */
366 mdelay(1);
367
368 /* clear descriptor addresses */
369 ag71xx_wr(ag, AG71XX_REG_TX_DESC, ag->stop_desc_dma);
370 ag71xx_wr(ag, AG71XX_REG_RX_DESC, ag->stop_desc_dma);
371
372 /* clear pending RX/TX interrupts */
373 for (i = 0; i < 256; i++) {
374 ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
375 ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_PS);
376 }
377
378 /* clear pending errors */
379 ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_BE | RX_STATUS_OF);
380 ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_BE | TX_STATUS_UR);
381
382 val = ag71xx_rr(ag, AG71XX_REG_RX_STATUS);
383 if (val)
384 pr_alert("%s: unable to clear DMA Rx status: %08x\n",
385 ag->dev->name, val);
386
387 val = ag71xx_rr(ag, AG71XX_REG_TX_STATUS);
388
389 /* mask out reserved bits */
390 val &= ~0xff000000;
391
392 if (val)
393 pr_alert("%s: unable to clear DMA Tx status: %08x\n",
394 ag->dev->name, val);
395
396 ag71xx_dump_dma_regs(ag);
397 }
398
399 #define MAC_CFG1_INIT (MAC_CFG1_RXE | MAC_CFG1_TXE | \
400 MAC_CFG1_SRX | MAC_CFG1_STX)
401
402 #define FIFO_CFG0_INIT (FIFO_CFG0_ALL << FIFO_CFG0_ENABLE_SHIFT)
403
404 #define FIFO_CFG4_INIT (FIFO_CFG4_DE | FIFO_CFG4_DV | FIFO_CFG4_FC | \
405 FIFO_CFG4_CE | FIFO_CFG4_CR | FIFO_CFG4_LM | \
406 FIFO_CFG4_LO | FIFO_CFG4_OK | FIFO_CFG4_MC | \
407 FIFO_CFG4_BC | FIFO_CFG4_DR | FIFO_CFG4_LE | \
408 FIFO_CFG4_CF | FIFO_CFG4_PF | FIFO_CFG4_UO | \
409 FIFO_CFG4_VT)
410
411 #define FIFO_CFG5_INIT (FIFO_CFG5_DE | FIFO_CFG5_DV | FIFO_CFG5_FC | \
412 FIFO_CFG5_CE | FIFO_CFG5_LO | FIFO_CFG5_OK | \
413 FIFO_CFG5_MC | FIFO_CFG5_BC | FIFO_CFG5_DR | \
414 FIFO_CFG5_CF | FIFO_CFG5_PF | FIFO_CFG5_VT | \
415 FIFO_CFG5_LE | FIFO_CFG5_FT | FIFO_CFG5_16 | \
416 FIFO_CFG5_17 | FIFO_CFG5_SF)
417
418 static void ag71xx_hw_stop(struct ag71xx *ag)
419 {
420 /* disable all interrupts and stop the rx/tx engine */
421 ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, 0);
422 ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
423 ag71xx_wr(ag, AG71XX_REG_TX_CTRL, 0);
424 }
425
426 static void ag71xx_hw_setup(struct ag71xx *ag)
427 {
428 struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
429
430 /* setup MAC configuration registers */
431 ag71xx_wr(ag, AG71XX_REG_MAC_CFG1, MAC_CFG1_INIT);
432
433 ag71xx_sb(ag, AG71XX_REG_MAC_CFG2,
434 MAC_CFG2_PAD_CRC_EN | MAC_CFG2_LEN_CHECK);
435
436 /* setup max frame length */
437 ag71xx_wr(ag, AG71XX_REG_MAC_MFL, AG71XX_TX_MTU_LEN);
438
439 /* setup FIFO configuration registers */
440 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG0, FIFO_CFG0_INIT);
441 if (pdata->is_ar724x) {
442 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG1, pdata->fifo_cfg1);
443 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG2, pdata->fifo_cfg2);
444 } else {
445 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG1, 0x0fff0000);
446 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG2, 0x00001fff);
447 }
448 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG4, FIFO_CFG4_INIT);
449 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, FIFO_CFG5_INIT);
450 }
451
452 static void ag71xx_hw_init(struct ag71xx *ag)
453 {
454 struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
455 u32 reset_mask = pdata->reset_bit;
456
457 ag71xx_hw_stop(ag);
458
459 if (pdata->is_ar724x) {
460 u32 reset_phy = reset_mask;
461
462 reset_phy &= AR71XX_RESET_GE0_PHY | AR71XX_RESET_GE1_PHY;
463 reset_mask &= ~(AR71XX_RESET_GE0_PHY | AR71XX_RESET_GE1_PHY);
464
465 ath79_device_reset_set(reset_phy);
466 mdelay(50);
467 ath79_device_reset_clear(reset_phy);
468 mdelay(200);
469 }
470
471 ag71xx_sb(ag, AG71XX_REG_MAC_CFG1, MAC_CFG1_SR);
472 udelay(20);
473
474 ath79_device_reset_set(reset_mask);
475 mdelay(100);
476 ath79_device_reset_clear(reset_mask);
477 mdelay(200);
478
479 ag71xx_hw_setup(ag);
480
481 ag71xx_dma_reset(ag);
482 }
483
484 static void ag71xx_fast_reset(struct ag71xx *ag)
485 {
486 struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
487 struct net_device *dev = ag->dev;
488 u32 reset_mask = pdata->reset_bit;
489 u32 rx_ds, tx_ds;
490 u32 mii_reg;
491
492 reset_mask &= AR71XX_RESET_GE0_MAC | AR71XX_RESET_GE1_MAC;
493
494 mii_reg = ag71xx_rr(ag, AG71XX_REG_MII_CFG);
495 rx_ds = ag71xx_rr(ag, AG71XX_REG_RX_DESC);
496 tx_ds = ag71xx_rr(ag, AG71XX_REG_TX_DESC);
497
498 ath79_device_reset_set(reset_mask);
499 udelay(10);
500 ath79_device_reset_clear(reset_mask);
501 udelay(10);
502
503 ag71xx_dma_reset(ag);
504 ag71xx_hw_setup(ag);
505
506 ag71xx_wr(ag, AG71XX_REG_RX_DESC, rx_ds);
507 ag71xx_wr(ag, AG71XX_REG_TX_DESC, tx_ds);
508 ag71xx_wr(ag, AG71XX_REG_MII_CFG, mii_reg);
509
510 ag71xx_hw_set_macaddr(ag, dev->dev_addr);
511 }
512
513 static void ag71xx_hw_start(struct ag71xx *ag)
514 {
515 /* start RX engine */
516 ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
517
518 /* enable interrupts */
519 ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, AG71XX_INT_INIT);
520 }
521
522 void ag71xx_link_adjust(struct ag71xx *ag)
523 {
524 struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
525 u32 cfg2;
526 u32 ifctl;
527 u32 fifo5;
528
529 if (!ag->link) {
530 ag71xx_hw_stop(ag);
531 netif_carrier_off(ag->dev);
532 if (netif_msg_link(ag))
533 pr_info("%s: link down\n", ag->dev->name);
534 return;
535 }
536
537 if (pdata->is_ar724x)
538 ag71xx_fast_reset(ag);
539
540 cfg2 = ag71xx_rr(ag, AG71XX_REG_MAC_CFG2);
541 cfg2 &= ~(MAC_CFG2_IF_1000 | MAC_CFG2_IF_10_100 | MAC_CFG2_FDX);
542 cfg2 |= (ag->duplex) ? MAC_CFG2_FDX : 0;
543
544 ifctl = ag71xx_rr(ag, AG71XX_REG_MAC_IFCTL);
545 ifctl &= ~(MAC_IFCTL_SPEED);
546
547 fifo5 = ag71xx_rr(ag, AG71XX_REG_FIFO_CFG5);
548 fifo5 &= ~FIFO_CFG5_BM;
549
550 switch (ag->speed) {
551 case SPEED_1000:
552 cfg2 |= MAC_CFG2_IF_1000;
553 fifo5 |= FIFO_CFG5_BM;
554 break;
555 case SPEED_100:
556 cfg2 |= MAC_CFG2_IF_10_100;
557 ifctl |= MAC_IFCTL_SPEED;
558 break;
559 case SPEED_10:
560 cfg2 |= MAC_CFG2_IF_10_100;
561 break;
562 default:
563 BUG();
564 return;
565 }
566
567 if (pdata->is_ar91xx)
568 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG3, 0x00780fff);
569 else if (pdata->is_ar724x)
570 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG3, pdata->fifo_cfg3);
571 else
572 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG3, 0x008001ff);
573
574 if (pdata->set_speed)
575 pdata->set_speed(ag->speed);
576
577 ag71xx_wr(ag, AG71XX_REG_MAC_CFG2, cfg2);
578 ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, fifo5);
579 ag71xx_wr(ag, AG71XX_REG_MAC_IFCTL, ifctl);
580 ag71xx_hw_start(ag);
581
582 netif_carrier_on(ag->dev);
583 if (netif_msg_link(ag))
584 pr_info("%s: link up (%sMbps/%s duplex)\n",
585 ag->dev->name,
586 ag71xx_speed_str(ag),
587 (DUPLEX_FULL == ag->duplex) ? "Full" : "Half");
588
589 DBG("%s: fifo_cfg0=%#x, fifo_cfg1=%#x, fifo_cfg2=%#x\n",
590 ag->dev->name,
591 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG0),
592 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG1),
593 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG2));
594
595 DBG("%s: fifo_cfg3=%#x, fifo_cfg4=%#x, fifo_cfg5=%#x\n",
596 ag->dev->name,
597 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG3),
598 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG4),
599 ag71xx_rr(ag, AG71XX_REG_FIFO_CFG5));
600
601 DBG("%s: mac_cfg2=%#x, mac_ifctl=%#x\n",
602 ag->dev->name,
603 ag71xx_rr(ag, AG71XX_REG_MAC_CFG2),
604 ag71xx_rr(ag, AG71XX_REG_MAC_IFCTL));
605 }
606
607 static int ag71xx_open(struct net_device *dev)
608 {
609 struct ag71xx *ag = netdev_priv(dev);
610 int ret;
611
612 ret = ag71xx_rings_init(ag);
613 if (ret)
614 goto err;
615
616 napi_enable(&ag->napi);
617
618 netif_carrier_off(dev);
619 ag71xx_phy_start(ag);
620
621 ag71xx_wr(ag, AG71XX_REG_TX_DESC, ag->tx_ring.descs_dma);
622 ag71xx_wr(ag, AG71XX_REG_RX_DESC, ag->rx_ring.descs_dma);
623
624 ag71xx_hw_set_macaddr(ag, dev->dev_addr);
625
626 netif_start_queue(dev);
627
628 return 0;
629
630 err:
631 ag71xx_rings_cleanup(ag);
632 return ret;
633 }
634
635 static int ag71xx_stop(struct net_device *dev)
636 {
637 struct ag71xx *ag = netdev_priv(dev);
638 unsigned long flags;
639
640 netif_carrier_off(dev);
641 ag71xx_phy_stop(ag);
642
643 spin_lock_irqsave(&ag->lock, flags);
644
645 netif_stop_queue(dev);
646
647 ag71xx_hw_stop(ag);
648 ag71xx_dma_reset(ag);
649
650 napi_disable(&ag->napi);
651 del_timer_sync(&ag->oom_timer);
652
653 spin_unlock_irqrestore(&ag->lock, flags);
654
655 ag71xx_rings_cleanup(ag);
656
657 return 0;
658 }
659
660 static netdev_tx_t ag71xx_hard_start_xmit(struct sk_buff *skb,
661 struct net_device *dev)
662 {
663 struct ag71xx *ag = netdev_priv(dev);
664 struct ag71xx_ring *ring = &ag->tx_ring;
665 struct ag71xx_desc *desc;
666 dma_addr_t dma_addr;
667 int i;
668
669 i = ring->curr % ring->size;
670 desc = ring->buf[i].desc;
671
672 if (!ag71xx_desc_empty(desc))
673 goto err_drop;
674
675 if (ag71xx_has_ar8216(ag))
676 ag71xx_add_ar8216_header(ag, skb);
677
678 if (skb->len <= 0) {
679 DBG("%s: packet len is too small\n", ag->dev->name);
680 goto err_drop;
681 }
682
683 dma_addr = dma_map_single(&dev->dev, skb->data, skb->len,
684 DMA_TO_DEVICE);
685
686 netdev_sent_queue(dev, skb->len);
687 ring->buf[i].skb = skb;
688 ring->buf[i].timestamp = jiffies;
689
690 /* setup descriptor fields */
691 desc->data = (u32) dma_addr;
692 desc->ctrl = (skb->len & DESC_PKTLEN_M);
693
694 /* flush descriptor */
695 wmb();
696
697 ring->curr++;
698 if (ring->curr == (ring->dirty + ring->size)) {
699 DBG("%s: tx queue full\n", ag->dev->name);
700 netif_stop_queue(dev);
701 }
702
703 DBG("%s: packet injected into TX queue\n", ag->dev->name);
704
705 /* enable TX engine */
706 ag71xx_wr(ag, AG71XX_REG_TX_CTRL, TX_CTRL_TXE);
707
708 return NETDEV_TX_OK;
709
710 err_drop:
711 dev->stats.tx_dropped++;
712
713 dev_kfree_skb(skb);
714 return NETDEV_TX_OK;
715 }
716
717 static int ag71xx_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
718 {
719 struct ag71xx *ag = netdev_priv(dev);
720 int ret;
721
722 switch (cmd) {
723 case SIOCETHTOOL:
724 if (ag->phy_dev == NULL)
725 break;
726
727 spin_lock_irq(&ag->lock);
728 ret = phy_ethtool_ioctl(ag->phy_dev, (void *) ifr->ifr_data);
729 spin_unlock_irq(&ag->lock);
730 return ret;
731
732 case SIOCSIFHWADDR:
733 if (copy_from_user
734 (dev->dev_addr, ifr->ifr_data, sizeof(dev->dev_addr)))
735 return -EFAULT;
736 return 0;
737
738 case SIOCGIFHWADDR:
739 if (copy_to_user
740 (ifr->ifr_data, dev->dev_addr, sizeof(dev->dev_addr)))
741 return -EFAULT;
742 return 0;
743
744 case SIOCGMIIPHY:
745 case SIOCGMIIREG:
746 case SIOCSMIIREG:
747 if (ag->phy_dev == NULL)
748 break;
749
750 return phy_mii_ioctl(ag->phy_dev, ifr, cmd);
751
752 default:
753 break;
754 }
755
756 return -EOPNOTSUPP;
757 }
758
759 static void ag71xx_oom_timer_handler(unsigned long data)
760 {
761 struct net_device *dev = (struct net_device *) data;
762 struct ag71xx *ag = netdev_priv(dev);
763
764 napi_schedule(&ag->napi);
765 }
766
767 static void ag71xx_tx_timeout(struct net_device *dev)
768 {
769 struct ag71xx *ag = netdev_priv(dev);
770
771 if (netif_msg_tx_err(ag))
772 pr_info("%s: tx timeout\n", ag->dev->name);
773
774 schedule_work(&ag->restart_work);
775 }
776
777 static void ag71xx_restart_work_func(struct work_struct *work)
778 {
779 struct ag71xx *ag = container_of(work, struct ag71xx, restart_work);
780
781 if (ag71xx_get_pdata(ag)->is_ar724x) {
782 ag->link = 0;
783 ag71xx_link_adjust(ag);
784 return;
785 }
786
787 ag71xx_stop(ag->dev);
788 ag71xx_open(ag->dev);
789 }
790
791 static bool ag71xx_check_dma_stuck(struct ag71xx *ag, unsigned long timestamp)
792 {
793 u32 rx_sm, tx_sm, rx_fd;
794
795 if (likely(time_before(jiffies, timestamp + HZ/10)))
796 return false;
797
798 if (!netif_carrier_ok(ag->dev))
799 return false;
800
801 rx_sm = ag71xx_rr(ag, AG71XX_REG_RX_SM);
802 if ((rx_sm & 0x7) == 0x3 && ((rx_sm >> 4) & 0x7) == 0x6)
803 return true;
804
805 tx_sm = ag71xx_rr(ag, AG71XX_REG_TX_SM);
806 rx_fd = ag71xx_rr(ag, AG71XX_REG_FIFO_DEPTH);
807 if (((tx_sm >> 4) & 0x7) == 0 && ((rx_sm & 0x7) == 0) &&
808 ((rx_sm >> 4) & 0x7) == 0 && rx_fd == 0)
809 return true;
810
811 return false;
812 }
813
814 static int ag71xx_tx_packets(struct ag71xx *ag)
815 {
816 struct ag71xx_ring *ring = &ag->tx_ring;
817 struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
818 int sent = 0;
819 int bytes_compl = 0;
820
821 DBG("%s: processing TX ring\n", ag->dev->name);
822
823 while (ring->dirty != ring->curr) {
824 unsigned int i = ring->dirty % ring->size;
825 struct ag71xx_desc *desc = ring->buf[i].desc;
826 struct sk_buff *skb = ring->buf[i].skb;
827
828 if (!ag71xx_desc_empty(desc)) {
829 if (pdata->is_ar7240 &&
830 ag71xx_check_dma_stuck(ag, ring->buf[i].timestamp))
831 schedule_work(&ag->restart_work);
832 break;
833 }
834
835 ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_PS);
836
837 bytes_compl += skb->len;
838 ag->dev->stats.tx_bytes += skb->len;
839 ag->dev->stats.tx_packets++;
840
841 dev_kfree_skb_any(skb);
842 ring->buf[i].skb = NULL;
843
844 ring->dirty++;
845 sent++;
846 }
847
848 DBG("%s: %d packets sent out\n", ag->dev->name, sent);
849
850 netdev_completed_queue(ag->dev, sent, bytes_compl);
851 if ((ring->curr - ring->dirty) < (ring->size * 3) / 4)
852 netif_wake_queue(ag->dev);
853
854 return sent;
855 }
856
857 static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
858 {
859 struct net_device *dev = ag->dev;
860 struct ag71xx_ring *ring = &ag->rx_ring;
861 int offset = ag71xx_buffer_offset(ag);
862 int done = 0;
863
864 DBG("%s: rx packets, limit=%d, curr=%u, dirty=%u\n",
865 dev->name, limit, ring->curr, ring->dirty);
866
867 while (done < limit) {
868 unsigned int i = ring->curr % ring->size;
869 struct ag71xx_desc *desc = ring->buf[i].desc;
870 struct sk_buff *skb;
871 int pktlen;
872 int err = 0;
873
874 if (ag71xx_desc_empty(desc))
875 break;
876
877 if ((ring->dirty + ring->size) == ring->curr) {
878 ag71xx_assert(0);
879 break;
880 }
881
882 ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
883
884 pktlen = ag71xx_desc_pktlen(desc);
885 pktlen -= ETH_FCS_LEN;
886
887 dma_unmap_single(&dev->dev, ring->buf[i].dma_addr,
888 AG71XX_RX_BUF_SIZE, DMA_FROM_DEVICE);
889
890 dev->last_rx = jiffies;
891 dev->stats.rx_packets++;
892 dev->stats.rx_bytes += pktlen;
893
894 skb = build_skb(ring->buf[i].rx_buf);
895 if (!skb) {
896 kfree(ring->buf[i].rx_buf);
897 goto next;
898 }
899
900 skb_reserve(skb, offset);
901 skb_put(skb, pktlen);
902
903 if (ag71xx_has_ar8216(ag))
904 err = ag71xx_remove_ar8216_header(ag, skb, pktlen);
905
906 if (err) {
907 dev->stats.rx_dropped++;
908 kfree_skb(skb);
909 } else {
910 skb->dev = dev;
911 skb->ip_summed = CHECKSUM_NONE;
912 skb->protocol = eth_type_trans(skb, dev);
913 netif_receive_skb(skb);
914 }
915
916 next:
917 ring->buf[i].rx_buf = NULL;
918 done++;
919
920 ring->curr++;
921 }
922
923 ag71xx_ring_rx_refill(ag);
924
925 DBG("%s: rx finish, curr=%u, dirty=%u, done=%d\n",
926 dev->name, ring->curr, ring->dirty, done);
927
928 return done;
929 }
930
931 static int ag71xx_poll(struct napi_struct *napi, int limit)
932 {
933 struct ag71xx *ag = container_of(napi, struct ag71xx, napi);
934 struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
935 struct net_device *dev = ag->dev;
936 struct ag71xx_ring *rx_ring;
937 unsigned long flags;
938 u32 status;
939 int tx_done;
940 int rx_done;
941
942 pdata->ddr_flush();
943 tx_done = ag71xx_tx_packets(ag);
944
945 DBG("%s: processing RX ring\n", dev->name);
946 rx_done = ag71xx_rx_packets(ag, limit);
947
948 ag71xx_debugfs_update_napi_stats(ag, rx_done, tx_done);
949
950 rx_ring = &ag->rx_ring;
951 if (rx_ring->buf[rx_ring->dirty % rx_ring->size].rx_buf == NULL)
952 goto oom;
953
954 status = ag71xx_rr(ag, AG71XX_REG_RX_STATUS);
955 if (unlikely(status & RX_STATUS_OF)) {
956 ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_OF);
957 dev->stats.rx_fifo_errors++;
958
959 /* restart RX */
960 ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
961 }
962
963 if (rx_done < limit) {
964 if (status & RX_STATUS_PR)
965 goto more;
966
967 status = ag71xx_rr(ag, AG71XX_REG_TX_STATUS);
968 if (status & TX_STATUS_PS)
969 goto more;
970
971 DBG("%s: disable polling mode, rx=%d, tx=%d,limit=%d\n",
972 dev->name, rx_done, tx_done, limit);
973
974 napi_complete(napi);
975
976 /* enable interrupts */
977 spin_lock_irqsave(&ag->lock, flags);
978 ag71xx_int_enable(ag, AG71XX_INT_POLL);
979 spin_unlock_irqrestore(&ag->lock, flags);
980 return rx_done;
981 }
982
983 more:
984 DBG("%s: stay in polling mode, rx=%d, tx=%d, limit=%d\n",
985 dev->name, rx_done, tx_done, limit);
986 return rx_done;
987
988 oom:
989 if (netif_msg_rx_err(ag))
990 pr_info("%s: out of memory\n", dev->name);
991
992 mod_timer(&ag->oom_timer, jiffies + AG71XX_OOM_REFILL);
993 napi_complete(napi);
994 return 0;
995 }
996
997 static irqreturn_t ag71xx_interrupt(int irq, void *dev_id)
998 {
999 struct net_device *dev = dev_id;
1000 struct ag71xx *ag = netdev_priv(dev);
1001 u32 status;
1002
1003 status = ag71xx_rr(ag, AG71XX_REG_INT_STATUS);
1004 ag71xx_dump_intr(ag, "raw", status);
1005
1006 if (unlikely(!status))
1007 return IRQ_NONE;
1008
1009 if (unlikely(status & AG71XX_INT_ERR)) {
1010 if (status & AG71XX_INT_TX_BE) {
1011 ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_BE);
1012 dev_err(&dev->dev, "TX BUS error\n");
1013 }
1014 if (status & AG71XX_INT_RX_BE) {
1015 ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_BE);
1016 dev_err(&dev->dev, "RX BUS error\n");
1017 }
1018 }
1019
1020 if (likely(status & AG71XX_INT_POLL)) {
1021 ag71xx_int_disable(ag, AG71XX_INT_POLL);
1022 DBG("%s: enable polling mode\n", dev->name);
1023 napi_schedule(&ag->napi);
1024 }
1025
1026 ag71xx_debugfs_update_int_stats(ag, status);
1027
1028 return IRQ_HANDLED;
1029 }
1030
1031 #ifdef CONFIG_NET_POLL_CONTROLLER
1032 /*
1033 * Polling 'interrupt' - used by things like netconsole to send skbs
1034 * without having to re-enable interrupts. It's not called while
1035 * the interrupt routine is executing.
1036 */
1037 static void ag71xx_netpoll(struct net_device *dev)
1038 {
1039 disable_irq(dev->irq);
1040 ag71xx_interrupt(dev->irq, dev);
1041 enable_irq(dev->irq);
1042 }
1043 #endif
1044
1045 static const struct net_device_ops ag71xx_netdev_ops = {
1046 .ndo_open = ag71xx_open,
1047 .ndo_stop = ag71xx_stop,
1048 .ndo_start_xmit = ag71xx_hard_start_xmit,
1049 .ndo_do_ioctl = ag71xx_do_ioctl,
1050 .ndo_tx_timeout = ag71xx_tx_timeout,
1051 .ndo_change_mtu = eth_change_mtu,
1052 .ndo_set_mac_address = eth_mac_addr,
1053 .ndo_validate_addr = eth_validate_addr,
1054 #ifdef CONFIG_NET_POLL_CONTROLLER
1055 .ndo_poll_controller = ag71xx_netpoll,
1056 #endif
1057 };
1058
1059 static int __devinit ag71xx_probe(struct platform_device *pdev)
1060 {
1061 struct net_device *dev;
1062 struct resource *res;
1063 struct ag71xx *ag;
1064 struct ag71xx_platform_data *pdata;
1065 int err;
1066
1067 pdata = pdev->dev.platform_data;
1068 if (!pdata) {
1069 dev_err(&pdev->dev, "no platform data specified\n");
1070 err = -ENXIO;
1071 goto err_out;
1072 }
1073
1074 if (pdata->mii_bus_dev == NULL) {
1075 dev_err(&pdev->dev, "no MII bus device specified\n");
1076 err = -EINVAL;
1077 goto err_out;
1078 }
1079
1080 dev = alloc_etherdev(sizeof(*ag));
1081 if (!dev) {
1082 dev_err(&pdev->dev, "alloc_etherdev failed\n");
1083 err = -ENOMEM;
1084 goto err_out;
1085 }
1086
1087 SET_NETDEV_DEV(dev, &pdev->dev);
1088
1089 ag = netdev_priv(dev);
1090 ag->pdev = pdev;
1091 ag->dev = dev;
1092 ag->msg_enable = netif_msg_init(ag71xx_msg_level,
1093 AG71XX_DEFAULT_MSG_ENABLE);
1094 spin_lock_init(&ag->lock);
1095
1096 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mac_base");
1097 if (!res) {
1098 dev_err(&pdev->dev, "no mac_base resource found\n");
1099 err = -ENXIO;
1100 goto err_out;
1101 }
1102
1103 ag->mac_base = ioremap_nocache(res->start, res->end - res->start + 1);
1104 if (!ag->mac_base) {
1105 dev_err(&pdev->dev, "unable to ioremap mac_base\n");
1106 err = -ENOMEM;
1107 goto err_free_dev;
1108 }
1109
1110 dev->irq = platform_get_irq(pdev, 0);
1111 err = request_irq(dev->irq, ag71xx_interrupt,
1112 IRQF_DISABLED,
1113 dev->name, dev);
1114 if (err) {
1115 dev_err(&pdev->dev, "unable to request IRQ %d\n", dev->irq);
1116 goto err_unmap_base;
1117 }
1118
1119 dev->base_addr = (unsigned long)ag->mac_base;
1120 dev->netdev_ops = &ag71xx_netdev_ops;
1121 dev->ethtool_ops = &ag71xx_ethtool_ops;
1122
1123 INIT_WORK(&ag->restart_work, ag71xx_restart_work_func);
1124
1125 init_timer(&ag->oom_timer);
1126 ag->oom_timer.data = (unsigned long) dev;
1127 ag->oom_timer.function = ag71xx_oom_timer_handler;
1128
1129 ag->tx_ring.size = AG71XX_TX_RING_SIZE_DEFAULT;
1130 ag->rx_ring.size = AG71XX_RX_RING_SIZE_DEFAULT;
1131
1132 ag->stop_desc = dma_alloc_coherent(NULL,
1133 sizeof(struct ag71xx_desc), &ag->stop_desc_dma, GFP_KERNEL);
1134
1135 if (!ag->stop_desc)
1136 goto err_free_irq;
1137
1138 ag->stop_desc->data = 0;
1139 ag->stop_desc->ctrl = 0;
1140 ag->stop_desc->next = (u32) ag->stop_desc_dma;
1141
1142 memcpy(dev->dev_addr, pdata->mac_addr, ETH_ALEN);
1143
1144 netif_napi_add(dev, &ag->napi, ag71xx_poll, AG71XX_NAPI_WEIGHT);
1145
1146 err = register_netdev(dev);
1147 if (err) {
1148 dev_err(&pdev->dev, "unable to register net device\n");
1149 goto err_free_desc;
1150 }
1151
1152 pr_info("%s: Atheros AG71xx at 0x%08lx, irq %d\n",
1153 dev->name, dev->base_addr, dev->irq);
1154
1155 ag71xx_dump_regs(ag);
1156
1157 ag71xx_hw_init(ag);
1158
1159 ag71xx_dump_regs(ag);
1160
1161 err = ag71xx_phy_connect(ag);
1162 if (err)
1163 goto err_unregister_netdev;
1164
1165 err = ag71xx_debugfs_init(ag);
1166 if (err)
1167 goto err_phy_disconnect;
1168
1169 platform_set_drvdata(pdev, dev);
1170
1171 return 0;
1172
1173 err_phy_disconnect:
1174 ag71xx_phy_disconnect(ag);
1175 err_unregister_netdev:
1176 unregister_netdev(dev);
1177 err_free_desc:
1178 dma_free_coherent(NULL, sizeof(struct ag71xx_desc), ag->stop_desc,
1179 ag->stop_desc_dma);
1180 err_free_irq:
1181 free_irq(dev->irq, dev);
1182 err_unmap_base:
1183 iounmap(ag->mac_base);
1184 err_free_dev:
1185 kfree(dev);
1186 err_out:
1187 platform_set_drvdata(pdev, NULL);
1188 return err;
1189 }
1190
1191 static int __devexit ag71xx_remove(struct platform_device *pdev)
1192 {
1193 struct net_device *dev = platform_get_drvdata(pdev);
1194
1195 if (dev) {
1196 struct ag71xx *ag = netdev_priv(dev);
1197
1198 ag71xx_debugfs_exit(ag);
1199 ag71xx_phy_disconnect(ag);
1200 unregister_netdev(dev);
1201 free_irq(dev->irq, dev);
1202 iounmap(ag->mac_base);
1203 kfree(dev);
1204 platform_set_drvdata(pdev, NULL);
1205 }
1206
1207 return 0;
1208 }
1209
1210 static struct platform_driver ag71xx_driver = {
1211 .probe = ag71xx_probe,
1212 .remove = __exit_p(ag71xx_remove),
1213 .driver = {
1214 .name = AG71XX_DRV_NAME,
1215 }
1216 };
1217
1218 static int __init ag71xx_module_init(void)
1219 {
1220 int ret;
1221
1222 ret = ag71xx_debugfs_root_init();
1223 if (ret)
1224 goto err_out;
1225
1226 ret = ag71xx_mdio_driver_init();
1227 if (ret)
1228 goto err_debugfs_exit;
1229
1230 ret = platform_driver_register(&ag71xx_driver);
1231 if (ret)
1232 goto err_mdio_exit;
1233
1234 return 0;
1235
1236 err_mdio_exit:
1237 ag71xx_mdio_driver_exit();
1238 err_debugfs_exit:
1239 ag71xx_debugfs_root_exit();
1240 err_out:
1241 return ret;
1242 }
1243
1244 static void __exit ag71xx_module_exit(void)
1245 {
1246 platform_driver_unregister(&ag71xx_driver);
1247 ag71xx_mdio_driver_exit();
1248 ag71xx_debugfs_root_exit();
1249 }
1250
1251 module_init(ag71xx_module_init);
1252 module_exit(ag71xx_module_exit);
1253
1254 MODULE_VERSION(AG71XX_DRV_VERSION);
1255 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
1256 MODULE_AUTHOR("Imre Kaloz <kaloz@openwrt.org>");
1257 MODULE_LICENSE("GPL v2");
1258 MODULE_ALIAS("platform:" AG71XX_DRV_NAME);
OpenWrt Source Repository