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ramips: raeth: make debugging messages configurable
[openwrt.git] / target / linux / ramips / files / drivers / net / ramips.c
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; version 2 of the License
5 *
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 * GNU General Public License for more details.
10 *
11 * You should have received a copy of the GNU General Public License
12 * along with this program; if not, write to the Free Software
13 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
14 *
15 * Copyright (C) 2009 John Crispin <blogic@openwrt.org>
16 */
17
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/types.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/init.h>
23 #include <linux/skbuff.h>
24 #include <linux/etherdevice.h>
25 #include <linux/ethtool.h>
26 #include <linux/platform_device.h>
27
28 #include <ramips_eth_platform.h>
29 #include "ramips_eth.h"
30
31 #define TX_TIMEOUT (20 * HZ / 100)
32 #define MAX_RX_LENGTH 1600
33
34 #ifdef CONFIG_RALINK_RT305X
35 #include "ramips_esw.c"
36 #else
37 static inline int rt305x_esw_init(void) { return 0; }
38 static inline void rt305x_esw_exit(void) { }
39 #endif
40
41 #define phys_to_bus(a) (a & 0x1FFFFFFF)
42
43 #ifdef CONFIG_RAMIPS_ETH_DEBUG
44 #define RADEBUG(fmt, args...) printk(KERN_DEBUG fmt, ## args)
45 #else
46 #define RADEBUG(fmt, args...) do {} while (0)
47 #endif
48
49 static struct net_device * ramips_dev;
50 static void __iomem *ramips_fe_base = 0;
51
52 static inline void
53 ramips_fe_wr(u32 val, unsigned reg)
54 {
55 __raw_writel(val, ramips_fe_base + reg);
56 }
57
58 static inline u32
59 ramips_fe_rr(unsigned reg)
60 {
61 return __raw_readl(ramips_fe_base + reg);
62 }
63
64 static inline void
65 ramips_fe_int_disable(u32 mask)
66 {
67 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~mask,
68 RAMIPS_FE_INT_ENABLE);
69 /* flush write */
70 ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
71 }
72
73 static inline void
74 ramips_fe_int_enable(u32 mask)
75 {
76 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | mask,
77 RAMIPS_FE_INT_ENABLE);
78 /* flush write */
79 ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
80 }
81
82 static inline void
83 ramips_hw_set_macaddr(unsigned char *mac)
84 {
85 ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
86 ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
87 RAMIPS_GDMA1_MAC_ADRL);
88 }
89
90 #ifdef CONFIG_RALINK_RT288X
91 static void
92 ramips_setup_mdio_cfg(struct raeth_priv *re)
93 {
94 unsigned int mdio_cfg;
95
96 mdio_cfg = RAMIPS_MDIO_CFG_TX_CLK_SKEW_200 |
97 RAMIPS_MDIO_CFG_TX_CLK_SKEW_200 |
98 RAMIPS_MDIO_CFG_GP1_FRC_EN;
99
100 if (re->duplex == DUPLEX_FULL)
101 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_DUPLEX;
102
103 if (re->tx_fc)
104 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_FC_TX;
105
106 if (re->rx_fc)
107 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_FC_RX;
108
109 switch (re->speed) {
110 case SPEED_10:
111 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_10;
112 break;
113 case SPEED_100:
114 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_100;
115 break;
116 case SPEED_1000:
117 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_1000;
118 break;
119 default:
120 BUG();
121 }
122
123 ramips_fe_wr(mdio_cfg, RAMIPS_MDIO_CFG);
124 }
125 #else
126 static inline void ramips_setup_mdio_cfg(struct raeth_priv *re)
127 {
128 }
129 #endif /* CONFIG_RALINK_RT288X */
130
131 static void
132 ramips_cleanup_dma(struct raeth_priv *re)
133 {
134 int i;
135
136 for (i = 0; i < NUM_RX_DESC; i++)
137 if (re->rx_skb[i]) {
138 dma_unmap_single(&re->netdev->dev, re->rx_dma[i],
139 MAX_RX_LENGTH, DMA_FROM_DEVICE);
140 dev_kfree_skb_any(re->rx_skb[i]);
141 }
142
143 if (re->rx)
144 dma_free_coherent(&re->netdev->dev,
145 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
146 re->rx, re->rx_desc_dma);
147
148 if (re->tx)
149 dma_free_coherent(&re->netdev->dev,
150 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
151 re->tx, re->tx_desc_dma);
152 }
153
154 static int
155 ramips_alloc_dma(struct raeth_priv *re)
156 {
157 int err = -ENOMEM;
158 int i;
159
160 re->skb_free_idx = 0;
161
162 /* setup tx ring */
163 re->tx = dma_alloc_coherent(&re->netdev->dev,
164 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
165 &re->tx_desc_dma, GFP_ATOMIC);
166 if (!re->tx)
167 goto err_cleanup;
168
169 memset(re->tx, 0, NUM_TX_DESC * sizeof(struct ramips_tx_dma));
170 for (i = 0; i < NUM_TX_DESC; i++) {
171 re->tx[i].txd2 = TX_DMA_LSO | TX_DMA_DONE;
172 re->tx[i].txd4 = TX_DMA_QN(3) | TX_DMA_PN(1);
173 }
174
175 /* setup rx ring */
176 re->rx = dma_alloc_coherent(&re->netdev->dev,
177 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
178 &re->rx_desc_dma, GFP_ATOMIC);
179 if (!re->rx)
180 goto err_cleanup;
181
182 memset(re->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
183 for (i = 0; i < NUM_RX_DESC; i++) {
184 dma_addr_t dma_addr;
185 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH +
186 NET_IP_ALIGN);
187
188 if (!new_skb)
189 goto err_cleanup;
190
191 skb_reserve(new_skb, NET_IP_ALIGN);
192
193 dma_addr = dma_map_single(&re->netdev->dev, new_skb->data,
194 MAX_RX_LENGTH, DMA_FROM_DEVICE);
195 re->rx_dma[i] = dma_addr;
196 re->rx[i].rxd1 = (unsigned int) re->rx_dma[i];
197 re->rx[i].rxd2 |= RX_DMA_LSO;
198 re->rx_skb[i] = new_skb;
199 }
200
201 return 0;
202
203 err_cleanup:
204 ramips_cleanup_dma(re);
205 return err;
206 }
207
208 static void
209 ramips_setup_dma(struct raeth_priv *re)
210 {
211 ramips_fe_wr(re->tx_desc_dma, RAMIPS_TX_BASE_PTR0);
212 ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
213 ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
214 ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
215
216 ramips_fe_wr(re->rx_desc_dma, RAMIPS_RX_BASE_PTR0);
217 ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
218 ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
219 ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
220 }
221
222 static int
223 ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
224 {
225 struct raeth_priv *priv = netdev_priv(dev);
226 unsigned long tx;
227 unsigned int tx_next;
228 dma_addr_t mapped_addr;
229
230 if (priv->plat->min_pkt_len) {
231 if (skb->len < priv->plat->min_pkt_len) {
232 if (skb_padto(skb, priv->plat->min_pkt_len)) {
233 printk(KERN_ERR
234 "ramips_eth: skb_padto failed\n");
235 kfree_skb(skb);
236 return 0;
237 }
238 skb_put(skb, priv->plat->min_pkt_len - skb->len);
239 }
240 }
241
242 dev->trans_start = jiffies;
243 mapped_addr = dma_map_single(&priv->netdev->dev, skb->data, skb->len,
244 DMA_TO_DEVICE);
245
246 spin_lock(&priv->page_lock);
247 tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
248 tx_next = (tx + 1) % NUM_TX_DESC;
249
250 if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
251 !(priv->tx[tx].txd2 & TX_DMA_DONE) ||
252 !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
253 goto out;
254
255 priv->tx[tx].txd1 = (unsigned int) mapped_addr;
256 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
257 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
258 dev->stats.tx_packets++;
259 dev->stats.tx_bytes += skb->len;
260 priv->tx_skb[tx] = skb;
261 wmb();
262 ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
263 spin_unlock(&priv->page_lock);
264 return NETDEV_TX_OK;
265
266 out:
267 spin_unlock(&priv->page_lock);
268 dev->stats.tx_dropped++;
269 kfree_skb(skb);
270 return NETDEV_TX_OK;
271 }
272
273 static void
274 ramips_eth_rx_hw(unsigned long ptr)
275 {
276 struct net_device *dev = (struct net_device *) ptr;
277 struct raeth_priv *priv = netdev_priv(dev);
278 int rx;
279 int max_rx = 16;
280
281 while (max_rx) {
282 struct sk_buff *rx_skb, *new_skb;
283 int pktlen;
284
285 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
286 if (!(priv->rx[rx].rxd2 & RX_DMA_DONE))
287 break;
288 max_rx--;
289
290 rx_skb = priv->rx_skb[rx];
291 pktlen = RX_DMA_PLEN0(priv->rx[rx].rxd2);
292
293 new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + NET_IP_ALIGN);
294 /* Reuse the buffer on allocation failures */
295 if (new_skb) {
296 dma_addr_t dma_addr;
297
298 dma_unmap_single(&priv->netdev->dev, priv->rx_dma[rx],
299 MAX_RX_LENGTH, DMA_FROM_DEVICE);
300
301 skb_put(rx_skb, pktlen);
302 rx_skb->dev = dev;
303 rx_skb->protocol = eth_type_trans(rx_skb, dev);
304 rx_skb->ip_summed = CHECKSUM_NONE;
305 dev->stats.rx_packets++;
306 dev->stats.rx_bytes += pktlen;
307 netif_rx(rx_skb);
308
309 priv->rx_skb[rx] = new_skb;
310 skb_reserve(new_skb, NET_IP_ALIGN);
311
312 dma_addr = dma_map_single(&priv->netdev->dev,
313 new_skb->data,
314 MAX_RX_LENGTH,
315 DMA_FROM_DEVICE);
316 priv->rx_dma[rx] = dma_addr;
317 priv->rx[rx].rxd1 = (unsigned int) dma_addr;
318 } else {
319 dev->stats.rx_dropped++;
320 }
321
322 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
323 wmb();
324 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
325 }
326
327 if (max_rx == 0)
328 tasklet_schedule(&priv->rx_tasklet);
329 else
330 ramips_fe_int_enable(RAMIPS_RX_DLY_INT);
331 }
332
333 static void
334 ramips_eth_tx_housekeeping(unsigned long ptr)
335 {
336 struct net_device *dev = (struct net_device*)ptr;
337 struct raeth_priv *priv = netdev_priv(dev);
338
339 spin_lock(&priv->page_lock);
340 while ((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
341 (priv->tx_skb[priv->skb_free_idx])) {
342 dev_kfree_skb_irq(priv->tx_skb[priv->skb_free_idx]);
343 priv->tx_skb[priv->skb_free_idx] = 0;
344 priv->skb_free_idx++;
345 if (priv->skb_free_idx >= NUM_TX_DESC)
346 priv->skb_free_idx = 0;
347 }
348 spin_unlock(&priv->page_lock);
349
350 ramips_fe_int_enable(RAMIPS_TX_DLY_INT);
351 }
352
353 static void
354 ramips_eth_timeout(struct net_device *dev)
355 {
356 struct raeth_priv *priv = netdev_priv(dev);
357
358 tasklet_schedule(&priv->tx_housekeeping_tasklet);
359 }
360
361 static irqreturn_t
362 ramips_eth_irq(int irq, void *dev)
363 {
364 struct raeth_priv *priv = netdev_priv(dev);
365 unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
366
367 ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
368
369 if (fe_int & RAMIPS_RX_DLY_INT) {
370 ramips_fe_int_disable(RAMIPS_RX_DLY_INT);
371 tasklet_schedule(&priv->rx_tasklet);
372 }
373
374 if (fe_int & RAMIPS_TX_DLY_INT) {
375 ramips_fe_int_disable(RAMIPS_TX_DLY_INT);
376 tasklet_schedule(&priv->tx_housekeeping_tasklet);
377 }
378
379 return IRQ_HANDLED;
380 }
381
382 static int
383 ramips_eth_open(struct net_device *dev)
384 {
385 struct raeth_priv *priv = netdev_priv(dev);
386 int err;
387
388 err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
389 dev->name, dev);
390 if (err)
391 return err;
392
393 err = ramips_alloc_dma(priv);
394 if (err)
395 goto err_free_irq;
396
397 ramips_hw_set_macaddr(dev->dev_addr);
398
399 ramips_setup_dma(priv);
400 ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
401 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
402 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
403 RAMIPS_PDMA_GLO_CFG);
404 ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
405 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
406 ((priv->plat->sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
407 RAMIPS_FE_GLO_CFG);
408
409 tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
410 (unsigned long)dev);
411 tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
412
413 ramips_setup_mdio_cfg(priv);
414
415 ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
416 ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
417 ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
418 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
419 RAMIPS_GDMA1_FWD_CFG);
420 ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
421 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
422 RAMIPS_CDMA_CSG_CFG);
423 ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
424 ramips_fe_wr(1, RAMIPS_FE_RST_GL);
425 ramips_fe_wr(0, RAMIPS_FE_RST_GL);
426
427 netif_start_queue(dev);
428 return 0;
429
430 err_free_irq:
431 free_irq(dev->irq, dev);
432 return err;
433 }
434
435 static int
436 ramips_eth_stop(struct net_device *dev)
437 {
438 struct raeth_priv *priv = netdev_priv(dev);
439
440 ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
441 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
442 RAMIPS_PDMA_GLO_CFG);
443
444 /* disable all interrupts in the hw */
445 ramips_fe_wr(0, RAMIPS_FE_INT_ENABLE);
446
447 free_irq(dev->irq, dev);
448 netif_stop_queue(dev);
449 tasklet_kill(&priv->tx_housekeeping_tasklet);
450 tasklet_kill(&priv->rx_tasklet);
451 ramips_cleanup_dma(priv);
452 RADEBUG("ramips_eth: stopped\n");
453 return 0;
454 }
455
456 static int __init
457 ramips_eth_probe(struct net_device *dev)
458 {
459 struct raeth_priv *priv = netdev_priv(dev);
460
461 BUG_ON(!priv->plat->reset_fe);
462 priv->plat->reset_fe();
463 net_srandom(jiffies);
464 memcpy(dev->dev_addr, priv->plat->mac, ETH_ALEN);
465
466 ether_setup(dev);
467 dev->mtu = 1500;
468 dev->watchdog_timeo = TX_TIMEOUT;
469 spin_lock_init(&priv->page_lock);
470
471 return 0;
472 }
473
474 static const struct net_device_ops ramips_eth_netdev_ops = {
475 .ndo_init = ramips_eth_probe,
476 .ndo_open = ramips_eth_open,
477 .ndo_stop = ramips_eth_stop,
478 .ndo_start_xmit = ramips_eth_hard_start_xmit,
479 .ndo_tx_timeout = ramips_eth_timeout,
480 .ndo_change_mtu = eth_change_mtu,
481 .ndo_set_mac_address = eth_mac_addr,
482 .ndo_validate_addr = eth_validate_addr,
483 };
484
485 static int
486 ramips_eth_plat_probe(struct platform_device *plat)
487 {
488 struct raeth_priv *priv;
489 struct ramips_eth_platform_data *data = plat->dev.platform_data;
490 struct resource *res;
491 int err;
492
493 if (!data) {
494 dev_err(&plat->dev, "no platform data specified\n");
495 return -EINVAL;
496 }
497
498 res = platform_get_resource(plat, IORESOURCE_MEM, 0);
499 if (!res) {
500 dev_err(&plat->dev, "no memory resource found\n");
501 return -ENXIO;
502 }
503
504 ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
505 if (!ramips_fe_base)
506 return -ENOMEM;
507
508 ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
509 if (!ramips_dev) {
510 dev_err(&plat->dev, "alloc_etherdev failed\n");
511 err = -ENOMEM;
512 goto err_unmap;
513 }
514
515 strcpy(ramips_dev->name, "eth%d");
516 ramips_dev->irq = platform_get_irq(plat, 0);
517 if (ramips_dev->irq < 0) {
518 dev_err(&plat->dev, "no IRQ resource found\n");
519 err = -ENXIO;
520 goto err_free_dev;
521 }
522 ramips_dev->addr_len = ETH_ALEN;
523 ramips_dev->base_addr = (unsigned long)ramips_fe_base;
524 ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
525
526 priv = netdev_priv(ramips_dev);
527
528 priv->netdev = ramips_dev;
529 priv->speed = data->speed;
530 priv->duplex = data->duplex;
531 priv->rx_fc = data->rx_fc;
532 priv->tx_fc = data->tx_fc;
533 priv->plat = data;
534
535 err = register_netdev(ramips_dev);
536 if (err) {
537 dev_err(&plat->dev, "error bringing up device\n");
538 goto err_free_dev;
539 }
540
541 RADEBUG("ramips_eth: loaded\n");
542 return 0;
543
544 err_free_dev:
545 kfree(ramips_dev);
546 err_unmap:
547 iounmap(ramips_fe_base);
548 return err;
549 }
550
551 static int
552 ramips_eth_plat_remove(struct platform_device *plat)
553 {
554 unregister_netdev(ramips_dev);
555 free_netdev(ramips_dev);
556 RADEBUG("ramips_eth: unloaded\n");
557 return 0;
558 }
559
560 static struct platform_driver ramips_eth_driver = {
561 .probe = ramips_eth_plat_probe,
562 .remove = ramips_eth_plat_remove,
563 .driver = {
564 .name = "ramips_eth",
565 .owner = THIS_MODULE,
566 },
567 };
568
569 static int __init
570 ramips_eth_init(void)
571 {
572 int ret;
573
574 ret = rt305x_esw_init();
575 if (ret)
576 return ret;
577
578 ret = platform_driver_register(&ramips_eth_driver);
579 if (ret) {
580 printk(KERN_ERR
581 "ramips_eth: Error registering platfom driver!\n");
582 goto esw_cleanup;
583 }
584
585 return 0;
586
587 esw_cleanup:
588 rt305x_esw_exit();
589 return ret;
590 }
591
592 static void __exit
593 ramips_eth_cleanup(void)
594 {
595 platform_driver_unregister(&ramips_eth_driver);
596 rt305x_esw_exit();
597 }
598
599 module_init(ramips_eth_init);
600 module_exit(ramips_eth_cleanup);
601
602 MODULE_LICENSE("GPL");
603 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
604 MODULE_DESCRIPTION("ethernet driver for ramips boards");
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