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[ramips] hopefully fixes dma issues seen on ethernet driver when under high load
[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 <ramips_eth_platform.h>
28 #include "ramips_eth.h"
29
30 #define TX_TIMEOUT (20 * HZ / 100)
31 #define MAX_RX_LENGTH 1500
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 void
55 ramips_cleanup_dma(struct net_device *dev)
56 {
57 struct raeth_priv *priv = netdev_priv(dev);
58 int i;
59
60 for (i = 0; i < NUM_RX_DESC; i++)
61 if (priv->rx_skb[i])
62 dev_kfree_skb_any(priv->rx_skb[i]);
63
64 if (priv->rx)
65 dma_free_coherent(NULL,
66 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
67 priv->rx, priv->phy_rx);
68
69 if (priv->tx)
70 dma_free_coherent(NULL,
71 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
72 priv->tx, priv->phy_tx);
73 }
74
75 static int
76 ramips_alloc_dma(struct net_device *dev)
77 {
78 struct raeth_priv *priv = netdev_priv(dev);
79 int err = -ENOMEM;
80 int i;
81
82 priv->skb_free_idx = 0;
83
84 /* setup tx ring */
85 priv->tx = dma_alloc_coherent(NULL,
86 NUM_TX_DESC * sizeof(struct ramips_tx_dma), &priv->phy_tx, GFP_ATOMIC);
87 if (!priv->tx)
88 goto err_cleanup;
89
90 for(i = 0; i < NUM_TX_DESC; i++)
91 {
92 memset(&priv->tx[i], 0, sizeof(struct ramips_tx_dma));
93 priv->tx[i].txd2 |= TX_DMA_LSO | TX_DMA_DONE;
94 priv->tx[i].txd4 &= (TX_DMA_QN_MASK | TX_DMA_PN_MASK);
95 priv->tx[i].txd4 |= TX_DMA_QN(3) | TX_DMA_PN(1);
96 }
97
98 /* setup rx ring */
99 priv->rx = dma_alloc_coherent(NULL,
100 NUM_RX_DESC * sizeof(struct ramips_rx_dma), &priv->phy_rx, GFP_ATOMIC);
101 if (!priv->rx)
102 goto err_cleanup;
103
104 memset(priv->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
105 for(i = 0; i < NUM_RX_DESC; i++)
106 {
107 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
108
109 if (!new_skb)
110 goto err_cleanup;
111
112 skb_reserve(new_skb, 2);
113 priv->rx[i].rxd1 =
114 dma_map_single(NULL, skb_put(new_skb, 2), MAX_RX_LENGTH + 2,
115 DMA_FROM_DEVICE);
116 priv->rx[i].rxd2 |= RX_DMA_LSO;
117 priv->rx_skb[i] = new_skb;
118 }
119
120 return 0;
121
122 err_cleanup:
123 ramips_cleanup_dma(dev);
124 return err;
125 }
126
127 static void
128 ramips_setup_dma(struct net_device *dev)
129 {
130 struct raeth_priv *priv = netdev_priv(dev);
131
132 ramips_fe_wr(phys_to_bus(priv->phy_tx), RAMIPS_TX_BASE_PTR0);
133 ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
134 ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
135 ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
136
137 ramips_fe_wr(phys_to_bus(priv->phy_rx), RAMIPS_RX_BASE_PTR0);
138 ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
139 ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
140 ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
141 }
142
143 static int
144 ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
145 {
146 struct raeth_priv *priv = netdev_priv(dev);
147 unsigned long tx;
148 unsigned int tx_next;
149 unsigned int mapped_addr;
150
151
152 if(priv->plat->min_pkt_len)
153 {
154 if(skb->len < priv->plat->min_pkt_len)
155 {
156 if(skb_padto(skb, priv->plat->min_pkt_len))
157 {
158 printk(KERN_ERR "ramips_eth: skb_padto failed\n");
159 kfree_skb(skb);
160 return 0;
161 }
162 skb_put(skb, priv->plat->min_pkt_len - skb->len);
163 }
164 }
165 dev->trans_start = jiffies;
166 mapped_addr = (unsigned int)dma_map_single(NULL, skb->data, skb->len,
167 DMA_TO_DEVICE);
168 dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
169 tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
170 if(tx == NUM_TX_DESC - 1)
171 tx_next = 0;
172 else
173 tx_next = tx + 1;
174 if((priv->tx_skb[tx] == 0) && (priv->tx_skb[tx_next] == 0))
175 {
176 if(!(priv->tx[tx].txd2 & TX_DMA_DONE) || !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
177 {
178 kfree_skb(skb);
179 dev->stats.tx_dropped++;
180 printk(KERN_ERR "%s: dropping\n", dev->name);
181 return 0;
182 }
183 priv->tx[tx].txd1 = virt_to_phys(skb->data);
184 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
185 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
186 wmb();
187 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
188 dev->stats.tx_packets++;
189 dev->stats.tx_bytes += skb->len;
190 priv->tx_skb[tx] = skb;
191 wmb();
192 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
193 } else {
194 dev->stats.tx_dropped++;
195 kfree_skb(skb);
196 }
197 return 0;
198 }
199
200 static void
201 ramips_eth_rx_hw(unsigned long ptr)
202 {
203 struct net_device *dev = (struct net_device*)ptr;
204 struct raeth_priv *priv = netdev_priv(dev);
205 int rx;
206 int max_rx = 16;
207
208 while(max_rx)
209 {
210 struct sk_buff *rx_skb, *new_skb;
211
212 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
213 if(!(priv->rx[rx].rxd2 & RX_DMA_DONE))
214 break;
215 max_rx--;
216
217 rx_skb = priv->rx_skb[rx];
218 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
219 rx_skb->tail = rx_skb->data + rx_skb->len;
220 rx_skb->dev = dev;
221 rx_skb->protocol = eth_type_trans(rx_skb, dev);
222 rx_skb->ip_summed = CHECKSUM_NONE;
223 dev->stats.rx_packets++;
224 dev->stats.rx_bytes += rx_skb->len;
225 netif_rx(rx_skb);
226
227 new_skb = __dev_alloc_skb(MAX_RX_LENGTH + 2, GFP_DMA | GFP_ATOMIC);
228 priv->rx_skb[rx] = new_skb;
229 BUG_ON(!new_skb);
230 skb_reserve(new_skb, 2);
231 priv->rx[rx].rxd1 =
232 dma_map_single(NULL, new_skb->data, MAX_RX_LENGTH + 2,
233 DMA_FROM_DEVICE);
234 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
235 wmb();
236 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
237 }
238 if(max_rx == 0)
239 tasklet_schedule(&priv->rx_tasklet);
240 else
241 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
242 RAMIPS_FE_INT_ENABLE);
243 }
244
245 static void
246 ramips_eth_tx_housekeeping(unsigned long ptr)
247 {
248 struct net_device *dev = (struct net_device*)ptr;
249 struct raeth_priv *priv = netdev_priv(dev);
250
251 while((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
252 (priv->tx_skb[priv->skb_free_idx]))
253 {
254 dev_kfree_skb_irq((struct sk_buff*)priv->tx_skb[priv->skb_free_idx]);
255 priv->tx_skb[priv->skb_free_idx] = 0;
256 priv->skb_free_idx++;
257 if(priv->skb_free_idx >= NUM_TX_DESC)
258 priv->skb_free_idx = 0;
259 }
260 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
261 RAMIPS_FE_INT_ENABLE);
262 }
263
264 static int
265 ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
266 {
267 unsigned char *mac = (unsigned char*)priv;
268
269 if(netif_running(dev))
270 return -EBUSY;
271 memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
272 ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
273 ramips_fe_wr(RAMIPS_GDMA1_MAC_ADRL,
274 (mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5]);
275 return 0;
276 }
277
278 static void
279 ramips_eth_timeout(struct net_device *dev)
280 {
281 struct raeth_priv *priv = netdev_priv(dev);
282
283 tasklet_schedule(&priv->tx_housekeeping_tasklet);
284 }
285
286 static irqreturn_t
287 ramips_eth_irq(int irq, void *dev)
288 {
289 struct raeth_priv *priv = netdev_priv(dev);
290 unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
291
292 ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
293
294 if(fe_int & RAMIPS_RX_DLY_INT)
295 {
296 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~(RAMIPS_RX_DLY_INT),
297 RAMIPS_FE_INT_ENABLE);
298 tasklet_schedule(&priv->rx_tasklet);
299 }
300 if(fe_int & RAMIPS_TX_DLY_INT)
301 ramips_eth_tx_housekeeping((unsigned long)dev);
302 return IRQ_HANDLED;
303 }
304
305 static int
306 ramips_eth_open(struct net_device *dev)
307 {
308 struct raeth_priv *priv = netdev_priv(dev);
309 int err;
310
311 err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
312 dev->name, dev);
313 if (err)
314 return err;
315
316 err = ramips_alloc_dma(dev);
317 if (err)
318 goto err_free_irq;
319
320 ramips_setup_dma(dev);
321 ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
322 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
323 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
324 RAMIPS_PDMA_GLO_CFG);
325 ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
326 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
327 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
328 RAMIPS_FE_GLO_CFG);
329 tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
330 (unsigned long)dev);
331 tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
332 ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
333 ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
334 ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
335 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
336 RAMIPS_GDMA1_FWD_CFG);
337 ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
338 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
339 RAMIPS_CDMA_CSG_CFG);
340 ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
341 ramips_fe_wr(1, RAMIPS_FE_RST_GL);
342 ramips_fe_wr(0, RAMIPS_FE_RST_GL);
343 netif_start_queue(dev);
344 return 0;
345
346 err_free_irq:
347 free_irq(dev->irq, dev);
348 return err;
349 }
350
351 static int
352 ramips_eth_stop(struct net_device *dev)
353 {
354 struct raeth_priv *priv = netdev_priv(dev);
355
356 ramips_fe_wr(RAMIPS_PDMA_GLO_CFG, ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
357 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN));
358 free_irq(dev->irq, dev);
359 netif_stop_queue(dev);
360 tasklet_kill(&priv->tx_housekeeping_tasklet);
361 tasklet_kill(&priv->rx_tasklet);
362 ramips_cleanup_dma(dev);
363 printk(KERN_DEBUG "ramips_eth: stopped\n");
364 return 0;
365 }
366
367 static int __init
368 ramips_eth_probe(struct net_device *dev)
369 {
370 struct raeth_priv *priv = netdev_priv(dev);
371 struct sockaddr addr;
372
373 BUG_ON(!priv->plat->reset_fe);
374 priv->plat->reset_fe();
375 net_srandom(jiffies);
376 memcpy(addr.sa_data, priv->plat->mac, 6);
377 ramips_eth_set_mac_addr(dev, &addr);
378
379 ether_setup(dev);
380 dev->open = ramips_eth_open;
381 dev->stop = ramips_eth_stop;
382 dev->hard_start_xmit = ramips_eth_hard_start_xmit;
383 dev->set_mac_address = ramips_eth_set_mac_addr;
384 dev->mtu = MAX_RX_LENGTH;
385 dev->tx_timeout = ramips_eth_timeout;
386 dev->watchdog_timeo = TX_TIMEOUT;
387 return 0;
388 }
389
390 static int
391 ramips_eth_plat_probe(struct platform_device *plat)
392 {
393 struct raeth_priv *priv;
394 struct ramips_eth_platform_data *data = plat->dev.platform_data;
395 struct resource *res;
396 int err;
397
398 if (!data) {
399 dev_err(&plat->dev, "no platform data specified\n");
400 return -EINVAL;
401 }
402
403 res = platform_get_resource(plat, IORESOURCE_MEM, 0);
404 if (!res) {
405 dev_err(&plat->dev, "no memory resource found\n");
406 return -ENXIO;
407 }
408
409 ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
410 if(!ramips_fe_base)
411 return -ENOMEM;
412
413 ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
414 if(!ramips_dev) {
415 dev_err(&plat->dev, "alloc_etherdev failed\n");
416 err = -ENOMEM;
417 goto err_unmap;
418 }
419
420 strcpy(ramips_dev->name, "eth%d");
421 ramips_dev->irq = platform_get_irq(plat, 0);
422 if (ramips_dev->irq < 0) {
423 dev_err(&plat->dev, "no IRQ resource found\n");
424 err = -ENXIO;
425 goto err_free_dev;
426 }
427 ramips_dev->addr_len = ETH_ALEN;
428 ramips_dev->base_addr = (unsigned long)ramips_fe_base;
429 ramips_dev->init = ramips_eth_probe;
430 priv = (struct raeth_priv*)netdev_priv(ramips_dev);
431 priv->plat = data;
432
433 err = register_netdev(ramips_dev);
434 if (err) {
435 dev_err(&plat->dev, "error bringing up device\n");
436 goto err_free_dev;
437 }
438
439 #ifdef CONFIG_RALINK_RT305X
440 rt305x_esw_init();
441 #endif
442 printk(KERN_DEBUG "ramips_eth: loaded\n");
443 return 0;
444
445 err_free_dev:
446 kfree(ramips_dev);
447 err_unmap:
448 iounmap(ramips_fe_base);
449 return err;
450 }
451
452 static int
453 ramips_eth_plat_remove(struct platform_device *plat)
454 {
455 unregister_netdev(ramips_dev);
456 free_netdev(ramips_dev);
457 printk(KERN_DEBUG "ramips_eth: unloaded\n");
458 return 0;
459 }
460
461 static struct platform_driver ramips_eth_driver = {
462 .probe = ramips_eth_plat_probe,
463 .remove = ramips_eth_plat_remove,
464 .driver = {
465 .name = "ramips_eth",
466 .owner = THIS_MODULE,
467 },
468 };
469
470 static int __init
471 ramips_eth_init(void)
472 {
473 int ret = platform_driver_register(&ramips_eth_driver);
474 if (ret)
475 printk(KERN_ERR
476 "ramips_eth: Error registering platfom driver!\n");
477 return ret;
478 }
479
480 static void __exit
481 ramips_eth_cleanup(void)
482 {
483 platform_driver_unregister(&ramips_eth_driver);
484 }
485
486 module_init(ramips_eth_init);
487 module_exit(ramips_eth_cleanup);
488
489 MODULE_LICENSE("GPL");
490 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
491 MODULE_DESCRIPTION("ethernet driver for ramips boards");
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