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ramips_eth: cleanup mac_address changing
[openwrt/svn-archive/archive.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/platform_device.h>
26
27 #include <ramips_eth_platform.h>
28 #include "ramips_eth.h"
29
30 #define TX_TIMEOUT (20 * HZ / 100)
31 #define MAX_RX_LENGTH 1600
32
33 #ifdef CONFIG_RALINK_RT305X
34 #include "ramips_esw.c"
35 #endif
36
37 #define phys_to_bus(a) (a & 0x1FFFFFFF)
38
39 static struct net_device * ramips_dev;
40 static void __iomem *ramips_fe_base = 0;
41
42 static inline void
43 ramips_fe_wr(u32 val, unsigned reg)
44 {
45 __raw_writel(val, ramips_fe_base + reg);
46 }
47
48 static inline u32
49 ramips_fe_rr(unsigned reg)
50 {
51 return __raw_readl(ramips_fe_base + reg);
52 }
53
54 static inline void
55 ramips_fe_int_disable(u32 mask)
56 {
57 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~mask,
58 RAMIPS_FE_INT_ENABLE);
59 /* flush write */
60 ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
61 }
62
63 static inline void
64 ramips_fe_int_enable(u32 mask)
65 {
66 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | mask,
67 RAMIPS_FE_INT_ENABLE);
68 /* flush write */
69 ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
70 }
71
72 static inline void
73 ramips_hw_set_macaddr(unsigned char *mac)
74 {
75 ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
76 ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
77 RAMIPS_GDMA1_MAC_ADRL);
78 }
79
80 static void
81 ramips_cleanup_dma(struct raeth_priv *re)
82 {
83 int i;
84
85 for (i = 0; i < NUM_RX_DESC; i++)
86 if (re->rx_skb[i])
87 dev_kfree_skb_any(re->rx_skb[i]);
88
89 if (re->rx)
90 dma_free_coherent(NULL,
91 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
92 re->rx, re->phy_rx);
93
94 if (re->tx)
95 dma_free_coherent(NULL,
96 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
97 re->tx, re->phy_tx);
98 }
99
100 static int
101 ramips_alloc_dma(struct raeth_priv *re)
102 {
103 int err = -ENOMEM;
104 int i;
105
106 re->skb_free_idx = 0;
107
108 /* setup tx ring */
109 re->tx = dma_alloc_coherent(NULL,
110 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
111 &re->phy_tx, GFP_ATOMIC);
112 if (!re->tx)
113 goto err_cleanup;
114
115 memset(re->tx, 0, NUM_TX_DESC * sizeof(struct ramips_tx_dma));
116 for (i = 0; i < NUM_TX_DESC; i++) {
117 re->tx[i].txd2 = TX_DMA_LSO | TX_DMA_DONE;
118 re->tx[i].txd4 = TX_DMA_QN(3) | TX_DMA_PN(1);
119 }
120
121 /* setup rx ring */
122 re->rx = dma_alloc_coherent(NULL,
123 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
124 &re->phy_rx, GFP_ATOMIC);
125 if (!re->rx)
126 goto err_cleanup;
127
128 memset(re->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
129 for (i = 0; i < NUM_RX_DESC; i++) {
130 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
131
132 if (!new_skb)
133 goto err_cleanup;
134
135 skb_reserve(new_skb, 2);
136 re->rx[i].rxd1 = dma_map_single(NULL,
137 skb_put(new_skb, 2),
138 MAX_RX_LENGTH + 2,
139 DMA_FROM_DEVICE);
140 re->rx[i].rxd2 |= RX_DMA_LSO;
141 re->rx_skb[i] = new_skb;
142 }
143
144 return 0;
145
146 err_cleanup:
147 ramips_cleanup_dma(re);
148 return err;
149 }
150
151 static void
152 ramips_setup_dma(struct raeth_priv *re)
153 {
154 ramips_fe_wr(phys_to_bus(re->phy_tx), RAMIPS_TX_BASE_PTR0);
155 ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
156 ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
157 ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
158
159 ramips_fe_wr(phys_to_bus(re->phy_rx), RAMIPS_RX_BASE_PTR0);
160 ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
161 ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
162 ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
163 }
164
165 static int
166 ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
167 {
168 struct raeth_priv *priv = netdev_priv(dev);
169 unsigned long tx;
170 unsigned int tx_next;
171 unsigned int mapped_addr;
172 unsigned long flags;
173
174 if (priv->plat->min_pkt_len) {
175 if (skb->len < priv->plat->min_pkt_len) {
176 if (skb_padto(skb, priv->plat->min_pkt_len)) {
177 printk(KERN_ERR
178 "ramips_eth: skb_padto failed\n");
179 kfree_skb(skb);
180 return 0;
181 }
182 skb_put(skb, priv->plat->min_pkt_len - skb->len);
183 }
184 }
185
186 dev->trans_start = jiffies;
187 mapped_addr = (unsigned int) dma_map_single(NULL, skb->data, skb->len,
188 DMA_TO_DEVICE);
189 dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
190 spin_lock_irqsave(&priv->page_lock, flags);
191 tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
192 tx_next = (tx + 1) % NUM_TX_DESC;
193
194 if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
195 !(priv->tx[tx].txd2 & TX_DMA_DONE) ||
196 !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
197 goto out;
198
199 priv->tx[tx].txd1 = mapped_addr;
200 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
201 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
202 dev->stats.tx_packets++;
203 dev->stats.tx_bytes += skb->len;
204 priv->tx_skb[tx] = skb;
205 wmb();
206 ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
207 spin_unlock_irqrestore(&priv->page_lock, flags);
208 return NETDEV_TX_OK;
209
210 out:
211 spin_unlock_irqrestore(&priv->page_lock, flags);
212 dev->stats.tx_dropped++;
213 kfree_skb(skb);
214 return NETDEV_TX_OK;
215 }
216
217 static void
218 ramips_eth_rx_hw(unsigned long ptr)
219 {
220 struct net_device *dev = (struct net_device *) ptr;
221 struct raeth_priv *priv = netdev_priv(dev);
222 int rx;
223 int max_rx = 16;
224
225 while (max_rx) {
226 struct sk_buff *rx_skb, *new_skb;
227
228 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
229 if (!(priv->rx[rx].rxd2 & RX_DMA_DONE))
230 break;
231 max_rx--;
232
233 rx_skb = priv->rx_skb[rx];
234 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
235 rx_skb->dev = dev;
236 rx_skb->protocol = eth_type_trans(rx_skb, dev);
237 rx_skb->ip_summed = CHECKSUM_NONE;
238 dev->stats.rx_packets++;
239 dev->stats.rx_bytes += rx_skb->len;
240 netif_rx(rx_skb);
241
242 new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + 2);
243 priv->rx_skb[rx] = new_skb;
244 BUG_ON(!new_skb);
245 skb_reserve(new_skb, 2);
246 priv->rx[rx].rxd1 = dma_map_single(NULL,
247 new_skb->data,
248 MAX_RX_LENGTH + 2,
249 DMA_FROM_DEVICE);
250 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
251 wmb();
252 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
253 }
254
255 if (max_rx == 0)
256 tasklet_schedule(&priv->rx_tasklet);
257 else
258 ramips_fe_int_enable(RAMIPS_RX_DLY_INT);
259 }
260
261 static void
262 ramips_eth_tx_housekeeping(unsigned long ptr)
263 {
264 struct net_device *dev = (struct net_device*)ptr;
265 struct raeth_priv *priv = netdev_priv(dev);
266
267 while ((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
268 (priv->tx_skb[priv->skb_free_idx])) {
269 dev_kfree_skb_irq(priv->tx_skb[priv->skb_free_idx]);
270 priv->tx_skb[priv->skb_free_idx] = 0;
271 priv->skb_free_idx++;
272 if (priv->skb_free_idx >= NUM_TX_DESC)
273 priv->skb_free_idx = 0;
274 }
275
276 ramips_fe_int_enable(RAMIPS_TX_DLY_INT);
277 }
278
279 static void
280 ramips_eth_timeout(struct net_device *dev)
281 {
282 struct raeth_priv *priv = netdev_priv(dev);
283
284 tasklet_schedule(&priv->tx_housekeeping_tasklet);
285 }
286
287 static irqreturn_t
288 ramips_eth_irq(int irq, void *dev)
289 {
290 struct raeth_priv *priv = netdev_priv(dev);
291 unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
292
293 ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
294
295 if (fe_int & RAMIPS_RX_DLY_INT) {
296 ramips_fe_int_disable(RAMIPS_RX_DLY_INT);
297 tasklet_schedule(&priv->rx_tasklet);
298 }
299
300 if (fe_int & RAMIPS_TX_DLY_INT)
301 ramips_eth_tx_housekeeping((unsigned long)dev);
302
303 return IRQ_HANDLED;
304 }
305
306 static int
307 ramips_eth_open(struct net_device *dev)
308 {
309 struct raeth_priv *priv = netdev_priv(dev);
310 int err;
311
312 err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
313 dev->name, dev);
314 if (err)
315 return err;
316
317 err = ramips_alloc_dma(priv);
318 if (err)
319 goto err_free_irq;
320
321 ramips_hw_set_macaddr(dev->dev_addr);
322
323 ramips_setup_dma(priv);
324 ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
325 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
326 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
327 RAMIPS_PDMA_GLO_CFG);
328 ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
329 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
330 ((priv->plat->sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
331 RAMIPS_FE_GLO_CFG);
332
333 tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
334 (unsigned long)dev);
335 tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
336
337 ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
338 ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
339 ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
340 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
341 RAMIPS_GDMA1_FWD_CFG);
342 ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
343 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
344 RAMIPS_CDMA_CSG_CFG);
345 ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
346 ramips_fe_wr(1, RAMIPS_FE_RST_GL);
347 ramips_fe_wr(0, RAMIPS_FE_RST_GL);
348
349 netif_start_queue(dev);
350 return 0;
351
352 err_free_irq:
353 free_irq(dev->irq, dev);
354 return err;
355 }
356
357 static int
358 ramips_eth_stop(struct net_device *dev)
359 {
360 struct raeth_priv *priv = netdev_priv(dev);
361
362 ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
363 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
364 RAMIPS_PDMA_GLO_CFG);
365 free_irq(dev->irq, dev);
366 netif_stop_queue(dev);
367 tasklet_kill(&priv->tx_housekeeping_tasklet);
368 tasklet_kill(&priv->rx_tasklet);
369 ramips_cleanup_dma(priv);
370 printk(KERN_DEBUG "ramips_eth: stopped\n");
371 return 0;
372 }
373
374 static int __init
375 ramips_eth_probe(struct net_device *dev)
376 {
377 struct raeth_priv *priv = netdev_priv(dev);
378
379 BUG_ON(!priv->plat->reset_fe);
380 priv->plat->reset_fe();
381 net_srandom(jiffies);
382 memcpy(dev->dev_addr, priv->plat->mac, ETH_ALEN);
383
384 ether_setup(dev);
385 dev->mtu = 1500;
386 dev->watchdog_timeo = TX_TIMEOUT;
387 spin_lock_init(&priv->page_lock);
388
389 return 0;
390 }
391
392 static const struct net_device_ops ramips_eth_netdev_ops = {
393 .ndo_init = ramips_eth_probe,
394 .ndo_open = ramips_eth_open,
395 .ndo_stop = ramips_eth_stop,
396 .ndo_start_xmit = ramips_eth_hard_start_xmit,
397 .ndo_tx_timeout = ramips_eth_timeout,
398 .ndo_change_mtu = eth_change_mtu,
399 .ndo_set_mac_address = eth_mac_addr,
400 .ndo_validate_addr = eth_validate_addr,
401 };
402
403 static int
404 ramips_eth_plat_probe(struct platform_device *plat)
405 {
406 struct raeth_priv *priv;
407 struct ramips_eth_platform_data *data = plat->dev.platform_data;
408 struct resource *res;
409 int err;
410
411 if (!data) {
412 dev_err(&plat->dev, "no platform data specified\n");
413 return -EINVAL;
414 }
415
416 res = platform_get_resource(plat, IORESOURCE_MEM, 0);
417 if (!res) {
418 dev_err(&plat->dev, "no memory resource found\n");
419 return -ENXIO;
420 }
421
422 ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
423 if (!ramips_fe_base)
424 return -ENOMEM;
425
426 ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
427 if (!ramips_dev) {
428 dev_err(&plat->dev, "alloc_etherdev failed\n");
429 err = -ENOMEM;
430 goto err_unmap;
431 }
432
433 strcpy(ramips_dev->name, "eth%d");
434 ramips_dev->irq = platform_get_irq(plat, 0);
435 if (ramips_dev->irq < 0) {
436 dev_err(&plat->dev, "no IRQ resource found\n");
437 err = -ENXIO;
438 goto err_free_dev;
439 }
440 ramips_dev->addr_len = ETH_ALEN;
441 ramips_dev->base_addr = (unsigned long)ramips_fe_base;
442 ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
443
444 priv = netdev_priv(ramips_dev);
445 priv->plat = data;
446
447 err = register_netdev(ramips_dev);
448 if (err) {
449 dev_err(&plat->dev, "error bringing up device\n");
450 goto err_free_dev;
451 }
452
453 #ifdef CONFIG_RALINK_RT305X
454 rt305x_esw_init();
455 #endif
456 printk(KERN_DEBUG "ramips_eth: loaded\n");
457 return 0;
458
459 err_free_dev:
460 kfree(ramips_dev);
461 err_unmap:
462 iounmap(ramips_fe_base);
463 return err;
464 }
465
466 static int
467 ramips_eth_plat_remove(struct platform_device *plat)
468 {
469 unregister_netdev(ramips_dev);
470 free_netdev(ramips_dev);
471 printk(KERN_DEBUG "ramips_eth: unloaded\n");
472 return 0;
473 }
474
475 static struct platform_driver ramips_eth_driver = {
476 .probe = ramips_eth_plat_probe,
477 .remove = ramips_eth_plat_remove,
478 .driver = {
479 .name = "ramips_eth",
480 .owner = THIS_MODULE,
481 },
482 };
483
484 static int __init
485 ramips_eth_init(void)
486 {
487 int ret = platform_driver_register(&ramips_eth_driver);
488 if (ret)
489 printk(KERN_ERR
490 "ramips_eth: Error registering platfom driver!\n");
491 return ret;
492 }
493
494 static void __exit
495 ramips_eth_cleanup(void)
496 {
497 platform_driver_unregister(&ramips_eth_driver);
498 }
499
500 module_init(ramips_eth_init);
501 module_exit(ramips_eth_cleanup);
502
503 MODULE_LICENSE("GPL");
504 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
505 MODULE_DESCRIPTION("ethernet driver for ramips boards");
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