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ramips_eth: simplify tx descriptor initialization
[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 void
55 ramips_cleanup_dma(struct raeth_priv *re)
56 {
57 int i;
58
59 for (i = 0; i < NUM_RX_DESC; i++)
60 if (re->rx_skb[i])
61 dev_kfree_skb_any(re->rx_skb[i]);
62
63 if (re->rx)
64 dma_free_coherent(NULL,
65 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
66 re->rx, re->phy_rx);
67
68 if (re->tx)
69 dma_free_coherent(NULL,
70 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
71 re->tx, re->phy_tx);
72 }
73
74 static int
75 ramips_alloc_dma(struct raeth_priv *re)
76 {
77 int err = -ENOMEM;
78 int i;
79
80 re->skb_free_idx = 0;
81
82 /* setup tx ring */
83 re->tx = dma_alloc_coherent(NULL,
84 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
85 &re->phy_tx, GFP_ATOMIC);
86 if (!re->tx)
87 goto err_cleanup;
88
89 memset(re->tx, 0, NUM_TX_DESC * sizeof(struct ramips_tx_dma));
90 for (i = 0; i < NUM_TX_DESC; i++) {
91 re->tx[i].txd2 = TX_DMA_LSO | TX_DMA_DONE;
92 re->tx[i].txd4 = TX_DMA_QN(3) | TX_DMA_PN(1);
93 }
94
95 /* setup rx ring */
96 re->rx = dma_alloc_coherent(NULL,
97 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
98 &re->phy_rx, GFP_ATOMIC);
99 if (!re->rx)
100 goto err_cleanup;
101
102 memset(re->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
103 for (i = 0; i < NUM_RX_DESC; i++) {
104 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
105
106 if (!new_skb)
107 goto err_cleanup;
108
109 skb_reserve(new_skb, 2);
110 re->rx[i].rxd1 = dma_map_single(NULL,
111 skb_put(new_skb, 2),
112 MAX_RX_LENGTH + 2,
113 DMA_FROM_DEVICE);
114 re->rx[i].rxd2 |= RX_DMA_LSO;
115 re->rx_skb[i] = new_skb;
116 }
117
118 return 0;
119
120 err_cleanup:
121 ramips_cleanup_dma(re);
122 return err;
123 }
124
125 static void
126 ramips_setup_dma(struct raeth_priv *re)
127 {
128 ramips_fe_wr(phys_to_bus(re->phy_tx), RAMIPS_TX_BASE_PTR0);
129 ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
130 ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
131 ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
132
133 ramips_fe_wr(phys_to_bus(re->phy_rx), RAMIPS_RX_BASE_PTR0);
134 ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
135 ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
136 ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
137 }
138
139 static int
140 ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
141 {
142 struct raeth_priv *priv = netdev_priv(dev);
143 unsigned long tx;
144 unsigned int tx_next;
145 unsigned int mapped_addr;
146 unsigned long flags;
147
148 if (priv->plat->min_pkt_len) {
149 if (skb->len < priv->plat->min_pkt_len) {
150 if (skb_padto(skb, priv->plat->min_pkt_len)) {
151 printk(KERN_ERR
152 "ramips_eth: skb_padto failed\n");
153 kfree_skb(skb);
154 return 0;
155 }
156 skb_put(skb, priv->plat->min_pkt_len - skb->len);
157 }
158 }
159
160 dev->trans_start = jiffies;
161 mapped_addr = (unsigned int) dma_map_single(NULL, skb->data, skb->len,
162 DMA_TO_DEVICE);
163 dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
164 spin_lock_irqsave(&priv->page_lock, flags);
165 tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
166 if (tx == NUM_TX_DESC - 1)
167 tx_next = 0;
168 else
169 tx_next = tx + 1;
170
171 if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
172 !(priv->tx[tx].txd2 & TX_DMA_DONE) ||
173 !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
174 goto out;
175
176 priv->tx[tx].txd1 = mapped_addr;
177 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
178 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
179 dev->stats.tx_packets++;
180 dev->stats.tx_bytes += skb->len;
181 priv->tx_skb[tx] = skb;
182 wmb();
183 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
184 spin_unlock_irqrestore(&priv->page_lock, flags);
185 return NETDEV_TX_OK;
186
187 out:
188 spin_unlock_irqrestore(&priv->page_lock, flags);
189 dev->stats.tx_dropped++;
190 kfree_skb(skb);
191 return NETDEV_TX_OK;
192 }
193
194 static void
195 ramips_eth_rx_hw(unsigned long ptr)
196 {
197 struct net_device *dev = (struct net_device *) ptr;
198 struct raeth_priv *priv = netdev_priv(dev);
199 int rx;
200 int max_rx = 16;
201
202 while (max_rx) {
203 struct sk_buff *rx_skb, *new_skb;
204
205 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
206 if (!(priv->rx[rx].rxd2 & RX_DMA_DONE))
207 break;
208 max_rx--;
209
210 rx_skb = priv->rx_skb[rx];
211 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
212 rx_skb->dev = dev;
213 rx_skb->protocol = eth_type_trans(rx_skb, dev);
214 rx_skb->ip_summed = CHECKSUM_NONE;
215 dev->stats.rx_packets++;
216 dev->stats.rx_bytes += rx_skb->len;
217 netif_rx(rx_skb);
218
219 new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + 2);
220 priv->rx_skb[rx] = new_skb;
221 BUG_ON(!new_skb);
222 skb_reserve(new_skb, 2);
223 priv->rx[rx].rxd1 = dma_map_single(NULL,
224 new_skb->data,
225 MAX_RX_LENGTH + 2,
226 DMA_FROM_DEVICE);
227 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
228 wmb();
229 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
230 }
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 dev_kfree_skb_irq((struct sk_buff *) priv->tx_skb[priv->skb_free_idx]);
248 priv->tx_skb[priv->skb_free_idx] = 0;
249 priv->skb_free_idx++;
250 if (priv->skb_free_idx >= NUM_TX_DESC)
251 priv->skb_free_idx = 0;
252 }
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
266 memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
267 ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
268 ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
269 RAMIPS_GDMA1_MAC_ADRL);
270 return 0;
271 }
272
273 static void
274 ramips_eth_timeout(struct net_device *dev)
275 {
276 struct raeth_priv *priv = netdev_priv(dev);
277
278 tasklet_schedule(&priv->tx_housekeeping_tasklet);
279 }
280
281 static irqreturn_t
282 ramips_eth_irq(int irq, void *dev)
283 {
284 struct raeth_priv *priv = netdev_priv(dev);
285 unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
286
287 ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
288
289 if (fe_int & RAMIPS_RX_DLY_INT) {
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
295 if (fe_int & RAMIPS_TX_DLY_INT)
296 ramips_eth_tx_housekeeping((unsigned long)dev);
297
298 return IRQ_HANDLED;
299 }
300
301 static int
302 ramips_eth_open(struct net_device *dev)
303 {
304 struct raeth_priv *priv = netdev_priv(dev);
305 int err;
306
307 err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
308 dev->name, dev);
309 if (err)
310 return err;
311
312 err = ramips_alloc_dma(priv);
313 if (err)
314 goto err_free_irq;
315
316 ramips_setup_dma(priv);
317 ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
318 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
319 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
320 RAMIPS_PDMA_GLO_CFG);
321 ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
322 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
323 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
324 RAMIPS_FE_GLO_CFG);
325
326 tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
327 (unsigned long)dev);
328 tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
329
330 ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
331 ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
332 ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
333 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
334 RAMIPS_GDMA1_FWD_CFG);
335 ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
336 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
337 RAMIPS_CDMA_CSG_CFG);
338 ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
339 ramips_fe_wr(1, RAMIPS_FE_RST_GL);
340 ramips_fe_wr(0, RAMIPS_FE_RST_GL);
341
342 netif_start_queue(dev);
343 return 0;
344
345 err_free_irq:
346 free_irq(dev->irq, dev);
347 return err;
348 }
349
350 static int
351 ramips_eth_stop(struct net_device *dev)
352 {
353 struct raeth_priv *priv = netdev_priv(dev);
354
355 ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
356 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
357 RAMIPS_PDMA_GLO_CFG);
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(priv);
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->mtu = 1500;
381 dev->watchdog_timeo = TX_TIMEOUT;
382 spin_lock_init(&priv->page_lock);
383
384 return 0;
385 }
386
387 static const struct net_device_ops ramips_eth_netdev_ops = {
388 .ndo_init = ramips_eth_probe,
389 .ndo_open = ramips_eth_open,
390 .ndo_stop = ramips_eth_stop,
391 .ndo_start_xmit = ramips_eth_hard_start_xmit,
392 .ndo_tx_timeout = ramips_eth_timeout,
393 .ndo_change_mtu = eth_change_mtu,
394 .ndo_set_mac_address = ramips_eth_set_mac_addr,
395 .ndo_validate_addr = eth_validate_addr,
396 };
397
398 static int
399 ramips_eth_plat_probe(struct platform_device *plat)
400 {
401 struct raeth_priv *priv;
402 struct ramips_eth_platform_data *data = plat->dev.platform_data;
403 struct resource *res;
404 int err;
405
406 if (!data) {
407 dev_err(&plat->dev, "no platform data specified\n");
408 return -EINVAL;
409 }
410
411 res = platform_get_resource(plat, IORESOURCE_MEM, 0);
412 if (!res) {
413 dev_err(&plat->dev, "no memory resource found\n");
414 return -ENXIO;
415 }
416
417 ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
418 if (!ramips_fe_base)
419 return -ENOMEM;
420
421 ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
422 if (!ramips_dev) {
423 dev_err(&plat->dev, "alloc_etherdev failed\n");
424 err = -ENOMEM;
425 goto err_unmap;
426 }
427
428 strcpy(ramips_dev->name, "eth%d");
429 ramips_dev->irq = platform_get_irq(plat, 0);
430 if (ramips_dev->irq < 0) {
431 dev_err(&plat->dev, "no IRQ resource found\n");
432 err = -ENXIO;
433 goto err_free_dev;
434 }
435 ramips_dev->addr_len = ETH_ALEN;
436 ramips_dev->base_addr = (unsigned long)ramips_fe_base;
437 ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
438
439 priv = netdev_priv(ramips_dev);
440 priv->plat = data;
441
442 err = register_netdev(ramips_dev);
443 if (err) {
444 dev_err(&plat->dev, "error bringing up device\n");
445 goto err_free_dev;
446 }
447
448 #ifdef CONFIG_RALINK_RT305X
449 rt305x_esw_init();
450 #endif
451 printk(KERN_DEBUG "ramips_eth: loaded\n");
452 return 0;
453
454 err_free_dev:
455 kfree(ramips_dev);
456 err_unmap:
457 iounmap(ramips_fe_base);
458 return err;
459 }
460
461 static int
462 ramips_eth_plat_remove(struct platform_device *plat)
463 {
464 unregister_netdev(ramips_dev);
465 free_netdev(ramips_dev);
466 printk(KERN_DEBUG "ramips_eth: unloaded\n");
467 return 0;
468 }
469
470 static struct platform_driver ramips_eth_driver = {
471 .probe = ramips_eth_plat_probe,
472 .remove = ramips_eth_plat_remove,
473 .driver = {
474 .name = "ramips_eth",
475 .owner = THIS_MODULE,
476 },
477 };
478
479 static int __init
480 ramips_eth_init(void)
481 {
482 int ret = platform_driver_register(&ramips_eth_driver);
483 if (ret)
484 printk(KERN_ERR
485 "ramips_eth: Error registering platfom driver!\n");
486 return ret;
487 }
488
489 static void __exit
490 ramips_eth_cleanup(void)
491 {
492 platform_driver_unregister(&ramips_eth_driver);
493 }
494
495 module_init(ramips_eth_init);
496 module_exit(ramips_eth_cleanup);
497
498 MODULE_LICENSE("GPL");
499 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
500 MODULE_DESCRIPTION("ethernet driver for ramips boards");
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