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ramips: request_irq prior to dma allocation, and handle the case if it fails
[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/platform_device.h>
26
27 #include <eth.h>
28
29 #define TX_TIMEOUT (20 * HZ / 100)
30 #define MAX_RX_LENGTH 1500
31
32 #ifdef CONFIG_RALINK_RT305X
33 #include "ramips_esw.c"
34 #endif
35
36 #define phys_to_bus(a) (a & 0x1FFFFFFF)
37
38 static struct net_device * ramips_dev;
39 static void __iomem *ramips_fe_base = 0;
40
41 static inline void
42 ramips_fe_wr(u32 val, unsigned reg)
43 {
44 __raw_writel(val, ramips_fe_base + reg);
45 }
46
47 static inline u32
48 ramips_fe_rr(unsigned reg)
49 {
50 return __raw_readl(ramips_fe_base + reg);
51 }
52
53 static void
54 ramips_cleanup_dma(struct net_device *dev)
55 {
56 struct raeth_priv *priv = netdev_priv(dev);
57 int i;
58
59 for (i = 0; i < NUM_RX_DESC; i++)
60 if (priv->rx_skb[i])
61 dev_kfree_skb_any(priv->rx_skb[i]);
62
63 if (priv->rx)
64 dma_free_coherent(NULL,
65 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
66 priv->rx, priv->phy_rx);
67
68 if (priv->tx)
69 dma_free_coherent(NULL,
70 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
71 priv->tx, priv->phy_tx);
72 }
73
74 static int
75 ramips_alloc_dma(struct net_device *dev)
76 {
77 struct raeth_priv *priv = netdev_priv(dev);
78 int err = -ENOMEM;
79 int i;
80
81 priv->skb_free_idx = 0;
82
83 /* setup tx ring */
84 priv->tx = dma_alloc_coherent(NULL,
85 NUM_TX_DESC * sizeof(struct ramips_tx_dma), &priv->phy_tx, GFP_ATOMIC);
86 if (!priv->tx)
87 goto err_cleanup;
88
89 for(i = 0; i < NUM_TX_DESC; i++)
90 {
91 memset(&priv->tx[i], 0, sizeof(struct ramips_tx_dma));
92 priv->tx[i].txd2 |= TX_DMA_LSO | TX_DMA_DONE;
93 priv->tx[i].txd4 &= (TX_DMA_QN_MASK | TX_DMA_PN_MASK);
94 priv->tx[i].txd4 |= TX_DMA_QN(3) | TX_DMA_PN(1);
95 }
96
97 /* setup rx ring */
98 priv->rx = dma_alloc_coherent(NULL,
99 NUM_RX_DESC * sizeof(struct ramips_rx_dma), &priv->phy_rx, GFP_ATOMIC);
100 if (!priv->rx)
101 goto err_cleanup;
102
103 memset(priv->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
104 for(i = 0; i < NUM_RX_DESC; i++)
105 {
106 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
107
108 if (!new_skb)
109 goto err_cleanup;
110
111 skb_reserve(new_skb, 2);
112 priv->rx[i].rxd1 =
113 dma_map_single(NULL, skb_put(new_skb, 2), MAX_RX_LENGTH + 2,
114 DMA_FROM_DEVICE);
115 priv->rx[i].rxd2 |= RX_DMA_LSO;
116 priv->rx_skb[i] = new_skb;
117 }
118
119 return 0;
120
121 err_cleanup:
122 ramips_cleanup_dma(dev);
123 return err;
124 }
125
126 static void
127 ramips_setup_dma(struct net_device *dev)
128 {
129 struct raeth_priv *priv = netdev_priv(dev);
130
131 ramips_fe_wr(phys_to_bus(priv->phy_tx), RAMIPS_TX_BASE_PTR0);
132 ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
133 ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
134 ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
135
136 ramips_fe_wr(phys_to_bus(priv->phy_rx), RAMIPS_RX_BASE_PTR0);
137 ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
138 ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
139 ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
140 }
141
142 static int
143 ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
144 {
145 struct raeth_priv *priv = netdev_priv(dev);
146 unsigned long tx;
147 unsigned int tx_next;
148 unsigned int mapped_addr;
149 if(priv->plat->min_pkt_len)
150 {
151 if(skb->len < priv->plat->min_pkt_len)
152 {
153 if(skb_padto(skb, priv->plat->min_pkt_len))
154 {
155 printk(KERN_ERR "ramips_eth: skb_padto failed\n");
156 kfree_skb(skb);
157 return 0;
158 }
159 skb_put(skb, priv->plat->min_pkt_len - skb->len);
160 }
161 }
162 dev->trans_start = jiffies;
163 mapped_addr = (unsigned int)dma_map_single(NULL, skb->data, skb->len,
164 DMA_TO_DEVICE);
165 dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
166 tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
167 if(tx == NUM_TX_DESC - 1)
168 tx_next = 0;
169 else
170 tx_next = tx + 1;
171 if((priv->tx_skb[tx]== 0) && (priv->tx_skb[tx_next] == 0))
172 {
173 if(!(priv->tx[tx].txd2 & TX_DMA_DONE))
174 {
175 kfree_skb(skb);
176 dev->stats.tx_dropped++;
177 printk(KERN_ERR "%s: dropping\n", dev->name);
178 return 0;
179 }
180 priv->tx[tx].txd1 = virt_to_phys(skb->data);
181 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
182 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
183 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
184 dev->stats.tx_packets++;
185 dev->stats.tx_bytes += skb->len;
186 priv->tx_skb[tx] = skb;
187 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
188 } else {
189 dev->stats.tx_dropped++;
190 kfree_skb(skb);
191 }
192 return 0;
193 }
194
195 static void
196 ramips_eth_rx_hw(unsigned long ptr)
197 {
198 struct net_device *dev = (struct net_device*)ptr;
199 struct raeth_priv *priv = netdev_priv(dev);
200 int rx;
201 int max_rx = 16;
202
203 while(max_rx)
204 {
205 struct sk_buff *rx_skb, *new_skb;
206
207 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
208 if(!(priv->rx[rx].rxd2 & RX_DMA_DONE))
209 break;
210 max_rx--;
211
212 rx_skb = priv->rx_skb[rx];
213 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
214 rx_skb->tail = rx_skb->data + rx_skb->len;
215 rx_skb->dev = dev;
216 rx_skb->protocol = eth_type_trans(rx_skb, dev);
217 rx_skb->ip_summed = CHECKSUM_NONE;
218 dev->stats.rx_packets++;
219 dev->stats.rx_bytes += rx_skb->len;
220 netif_rx(rx_skb);
221
222 new_skb = __dev_alloc_skb(MAX_RX_LENGTH + 2, GFP_DMA | GFP_ATOMIC);
223 priv->rx_skb[rx] = new_skb;
224 BUG_ON(!new_skb);
225 skb_reserve(new_skb, 2);
226 priv->rx[rx].rxd1 =
227 dma_map_single(NULL, new_skb->data, MAX_RX_LENGTH + 2,
228 DMA_FROM_DEVICE);
229 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
230 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
231 }
232 if(max_rx == 0)
233 tasklet_schedule(&priv->rx_tasklet);
234 else
235 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
236 RAMIPS_FE_INT_ENABLE);
237 }
238
239 static void
240 ramips_eth_tx_housekeeping(unsigned long ptr)
241 {
242 struct net_device *dev = (struct net_device*)ptr;
243 struct raeth_priv *priv = netdev_priv(dev);
244
245 while((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
246 (priv->tx_skb[priv->skb_free_idx]))
247 {
248 dev_kfree_skb_irq((struct sk_buff*)priv->tx_skb[priv->skb_free_idx]);
249 priv->tx_skb[priv->skb_free_idx] = 0;
250 priv->skb_free_idx++;
251 if(priv->skb_free_idx >= NUM_TX_DESC)
252 priv->skb_free_idx = 0;
253 }
254 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
255 RAMIPS_FE_INT_ENABLE);
256 }
257
258 static int
259 ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
260 {
261 unsigned char *mac = (unsigned char*)priv;
262
263 if(netif_running(dev))
264 return -EBUSY;
265 memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
266 ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
267 ramips_fe_wr(RAMIPS_GDMA1_MAC_ADRL,
268 (mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5]);
269 return 0;
270 }
271
272 static void
273 ramips_eth_timeout(struct net_device *dev)
274 {
275 struct raeth_priv *priv = netdev_priv(dev);
276
277 tasklet_schedule(&priv->tx_housekeeping_tasklet);
278 }
279
280 static irqreturn_t
281 ramips_eth_irq(int irq, void *dev)
282 {
283 struct raeth_priv *priv = netdev_priv(dev);
284 unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
285
286 ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
287
288 if(fe_int & RAMIPS_RX_DLY_INT)
289 {
290 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~(RAMIPS_RX_DLY_INT),
291 RAMIPS_FE_INT_ENABLE);
292 tasklet_schedule(&priv->rx_tasklet);
293 }
294 if(fe_int & RAMIPS_TX_DLY_INT)
295 ramips_eth_tx_housekeeping((unsigned long)dev);
296 return IRQ_HANDLED;
297 }
298
299 static int
300 ramips_eth_open(struct net_device *dev)
301 {
302 struct raeth_priv *priv = netdev_priv(dev);
303 int err;
304
305 err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
306 dev->name, dev);
307 if (err)
308 return err;
309
310 err = ramips_alloc_dma(dev);
311 if (err)
312 goto err_free_irq;
313
314 ramips_setup_dma(dev);
315 ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
316 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
317 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
318 RAMIPS_PDMA_GLO_CFG);
319 ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
320 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
321 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
322 RAMIPS_FE_GLO_CFG);
323 tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
324 (unsigned long)dev);
325 tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
326 ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
327 ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
328 ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
329 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
330 RAMIPS_GDMA1_FWD_CFG);
331 ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
332 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
333 RAMIPS_CDMA_CSG_CFG);
334 ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
335 ramips_fe_wr(1, RAMIPS_FE_RST_GL);
336 ramips_fe_wr(0, RAMIPS_FE_RST_GL);
337 netif_start_queue(dev);
338 return 0;
339
340 err_free_irq:
341 free_irq(dev->irq, dev);
342 return err;
343 }
344
345 static int
346 ramips_eth_stop(struct net_device *dev)
347 {
348 struct raeth_priv *priv = netdev_priv(dev);
349
350 ramips_fe_wr(RAMIPS_PDMA_GLO_CFG, ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
351 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN));
352 free_irq(dev->irq, dev);
353 netif_stop_queue(dev);
354 tasklet_kill(&priv->tx_housekeeping_tasklet);
355 tasklet_kill(&priv->rx_tasklet);
356 ramips_cleanup_dma(dev);
357 printk(KERN_DEBUG "ramips_eth: stopped\n");
358 return 0;
359 }
360
361 static int __init
362 ramips_eth_probe(struct net_device *dev)
363 {
364 struct raeth_priv *priv = netdev_priv(dev);
365 struct sockaddr addr;
366
367 BUG_ON(!priv->plat->reset_fe);
368 priv->plat->reset_fe();
369 net_srandom(jiffies);
370 memcpy(addr.sa_data, priv->plat->mac, 6);
371 ramips_eth_set_mac_addr(dev, &addr);
372
373 ether_setup(dev);
374 dev->open = ramips_eth_open;
375 dev->stop = ramips_eth_stop;
376 dev->hard_start_xmit = ramips_eth_hard_start_xmit;
377 dev->set_mac_address = ramips_eth_set_mac_addr;
378 dev->mtu = MAX_RX_LENGTH;
379 dev->tx_timeout = ramips_eth_timeout;
380 dev->watchdog_timeo = TX_TIMEOUT;
381 return 0;
382 }
383
384 static int
385 ramips_eth_plat_probe(struct platform_device *plat)
386 {
387 struct raeth_priv *priv;
388 struct ramips_eth_platform_data *data = plat->dev.platform_data;
389 struct resource *res;
390 int err;
391
392 if (!data) {
393 dev_err(&plat->dev, "no platform data specified\n");
394 return -EINVAL;
395 }
396
397 res = platform_get_resource(plat, IORESOURCE_MEM, 0);
398 if (!res) {
399 dev_err(&plat->dev, "no memory resource found\n");
400 return -ENXIO;
401 }
402
403 ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
404 if(!ramips_fe_base)
405 return -ENOMEM;
406
407 ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
408 if(!ramips_dev) {
409 dev_err(&plat->dev, "alloc_etherdev failed\n");
410 err = -ENOMEM;
411 goto err_unmap;
412 }
413
414 strcpy(ramips_dev->name, "eth%d");
415 ramips_dev->irq = platform_get_irq(plat, 0);
416 if (ramips_dev->irq < 0) {
417 dev_err(&plat->dev, "no IRQ resource found\n");
418 err = -ENXIO;
419 goto err_free_dev;
420 }
421 ramips_dev->addr_len = ETH_ALEN;
422 ramips_dev->base_addr = (unsigned long)ramips_fe_base;
423 ramips_dev->init = ramips_eth_probe;
424 priv = (struct raeth_priv*)netdev_priv(ramips_dev);
425 priv->plat = data;
426
427 err = register_netdev(ramips_dev);
428 if (err) {
429 dev_err(&plat->dev, "error bringing up device\n");
430 goto err_free_dev;
431 }
432
433 #ifdef CONFIG_RALINK_RT305X
434 rt305x_esw_init();
435 #endif
436 printk(KERN_DEBUG "ramips_eth: loaded\n");
437 return 0;
438
439 err_free_dev:
440 kfree(ramips_dev);
441 err_unmap:
442 iounmap(ramips_fe_base);
443 return err;
444 }
445
446 static int
447 ramips_eth_plat_remove(struct platform_device *plat)
448 {
449 unregister_netdev(ramips_dev);
450 free_netdev(ramips_dev);
451 printk(KERN_DEBUG "ramips_eth: unloaded\n");
452 return 0;
453 }
454
455 static struct platform_driver ramips_eth_driver = {
456 .probe = ramips_eth_plat_probe,
457 .remove = ramips_eth_plat_remove,
458 .driver = {
459 .name = "ramips_eth",
460 .owner = THIS_MODULE,
461 },
462 };
463
464 static int __init
465 ramips_eth_init(void)
466 {
467 int ret = platform_driver_register(&ramips_eth_driver);
468 if (ret)
469 printk(KERN_ERR
470 "ramips_eth: Error registering platfom driver!\n");
471 return ret;
472 }
473
474 static void __exit
475 ramips_eth_cleanup(void)
476 {
477 platform_driver_unregister(&ramips_eth_driver);
478 }
479
480 module_init(ramips_eth_init);
481 module_exit(ramips_eth_cleanup);
482
483 MODULE_LICENSE("GPL");
484 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
485 MODULE_DESCRIPTION("ethernet driver for ramips boards");
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