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