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ramips_eth: remove unnecessary typecasts
[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 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 tx_next = (tx + 1) % NUM_TX_DESC;
167
168 if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
169 !(priv->tx[tx].txd2 & TX_DMA_DONE) ||
170 !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
171 goto out;
172
173 priv->tx[tx].txd1 = mapped_addr;
174 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
175 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
176 dev->stats.tx_packets++;
177 dev->stats.tx_bytes += skb->len;
178 priv->tx_skb[tx] = skb;
179 wmb();
180 ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
181 spin_unlock_irqrestore(&priv->page_lock, flags);
182 return NETDEV_TX_OK;
183
184 out:
185 spin_unlock_irqrestore(&priv->page_lock, flags);
186 dev->stats.tx_dropped++;
187 kfree_skb(skb);
188 return NETDEV_TX_OK;
189 }
190
191 static void
192 ramips_eth_rx_hw(unsigned long ptr)
193 {
194 struct net_device *dev = (struct net_device *) ptr;
195 struct raeth_priv *priv = netdev_priv(dev);
196 int rx;
197 int max_rx = 16;
198
199 while (max_rx) {
200 struct sk_buff *rx_skb, *new_skb;
201
202 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
203 if (!(priv->rx[rx].rxd2 & RX_DMA_DONE))
204 break;
205 max_rx--;
206
207 rx_skb = priv->rx_skb[rx];
208 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
209 rx_skb->dev = dev;
210 rx_skb->protocol = eth_type_trans(rx_skb, dev);
211 rx_skb->ip_summed = CHECKSUM_NONE;
212 dev->stats.rx_packets++;
213 dev->stats.rx_bytes += rx_skb->len;
214 netif_rx(rx_skb);
215
216 new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + 2);
217 priv->rx_skb[rx] = new_skb;
218 BUG_ON(!new_skb);
219 skb_reserve(new_skb, 2);
220 priv->rx[rx].rxd1 = dma_map_single(NULL,
221 new_skb->data,
222 MAX_RX_LENGTH + 2,
223 DMA_FROM_DEVICE);
224 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
225 wmb();
226 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
227 }
228
229 if (max_rx == 0)
230 tasklet_schedule(&priv->rx_tasklet);
231 else
232 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
233 RAMIPS_FE_INT_ENABLE);
234 }
235
236 static void
237 ramips_eth_tx_housekeeping(unsigned long ptr)
238 {
239 struct net_device *dev = (struct net_device*)ptr;
240 struct raeth_priv *priv = netdev_priv(dev);
241
242 while ((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
243 (priv->tx_skb[priv->skb_free_idx])) {
244 dev_kfree_skb_irq(priv->tx_skb[priv->skb_free_idx]);
245 priv->tx_skb[priv->skb_free_idx] = 0;
246 priv->skb_free_idx++;
247 if (priv->skb_free_idx >= NUM_TX_DESC)
248 priv->skb_free_idx = 0;
249 }
250
251 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
252 RAMIPS_FE_INT_ENABLE);
253 }
254
255 static int
256 ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
257 {
258 unsigned char *mac = priv;
259
260 if (netif_running(dev))
261 return -EBUSY;
262
263 memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
264 ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
265 ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
266 RAMIPS_GDMA1_MAC_ADRL);
267 return 0;
268 }
269
270 static void
271 ramips_eth_timeout(struct net_device *dev)
272 {
273 struct raeth_priv *priv = netdev_priv(dev);
274
275 tasklet_schedule(&priv->tx_housekeeping_tasklet);
276 }
277
278 static irqreturn_t
279 ramips_eth_irq(int irq, void *dev)
280 {
281 struct raeth_priv *priv = netdev_priv(dev);
282 unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
283
284 ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
285
286 if (fe_int & RAMIPS_RX_DLY_INT) {
287 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~(RAMIPS_RX_DLY_INT),
288 RAMIPS_FE_INT_ENABLE);
289 tasklet_schedule(&priv->rx_tasklet);
290 }
291
292 if (fe_int & RAMIPS_TX_DLY_INT)
293 ramips_eth_tx_housekeeping((unsigned long)dev);
294
295 return IRQ_HANDLED;
296 }
297
298 static int
299 ramips_eth_open(struct net_device *dev)
300 {
301 struct raeth_priv *priv = netdev_priv(dev);
302 int err;
303
304 err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
305 dev->name, dev);
306 if (err)
307 return err;
308
309 err = ramips_alloc_dma(priv);
310 if (err)
311 goto err_free_irq;
312
313 ramips_setup_dma(priv);
314 ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
315 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
316 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
317 RAMIPS_PDMA_GLO_CFG);
318 ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
319 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
320 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
321 RAMIPS_FE_GLO_CFG);
322
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
327 ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
328 ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
329 ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
330 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
331 RAMIPS_GDMA1_FWD_CFG);
332 ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
333 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
334 RAMIPS_CDMA_CSG_CFG);
335 ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
336 ramips_fe_wr(1, RAMIPS_FE_RST_GL);
337 ramips_fe_wr(0, RAMIPS_FE_RST_GL);
338
339 netif_start_queue(dev);
340 return 0;
341
342 err_free_irq:
343 free_irq(dev->irq, dev);
344 return err;
345 }
346
347 static int
348 ramips_eth_stop(struct net_device *dev)
349 {
350 struct raeth_priv *priv = netdev_priv(dev);
351
352 ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
353 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
354 RAMIPS_PDMA_GLO_CFG);
355 free_irq(dev->irq, dev);
356 netif_stop_queue(dev);
357 tasklet_kill(&priv->tx_housekeeping_tasklet);
358 tasklet_kill(&priv->rx_tasklet);
359 ramips_cleanup_dma(priv);
360 printk(KERN_DEBUG "ramips_eth: stopped\n");
361 return 0;
362 }
363
364 static int __init
365 ramips_eth_probe(struct net_device *dev)
366 {
367 struct raeth_priv *priv = netdev_priv(dev);
368 struct sockaddr addr;
369
370 BUG_ON(!priv->plat->reset_fe);
371 priv->plat->reset_fe();
372 net_srandom(jiffies);
373 memcpy(addr.sa_data, priv->plat->mac, 6);
374 ramips_eth_set_mac_addr(dev, &addr);
375
376 ether_setup(dev);
377 dev->mtu = 1500;
378 dev->watchdog_timeo = TX_TIMEOUT;
379 spin_lock_init(&priv->page_lock);
380
381 return 0;
382 }
383
384 static const struct net_device_ops ramips_eth_netdev_ops = {
385 .ndo_init = ramips_eth_probe,
386 .ndo_open = ramips_eth_open,
387 .ndo_stop = ramips_eth_stop,
388 .ndo_start_xmit = ramips_eth_hard_start_xmit,
389 .ndo_tx_timeout = ramips_eth_timeout,
390 .ndo_change_mtu = eth_change_mtu,
391 .ndo_set_mac_address = ramips_eth_set_mac_addr,
392 .ndo_validate_addr = eth_validate_addr,
393 };
394
395 static int
396 ramips_eth_plat_probe(struct platform_device *plat)
397 {
398 struct raeth_priv *priv;
399 struct ramips_eth_platform_data *data = plat->dev.platform_data;
400 struct resource *res;
401 int err;
402
403 if (!data) {
404 dev_err(&plat->dev, "no platform data specified\n");
405 return -EINVAL;
406 }
407
408 res = platform_get_resource(plat, IORESOURCE_MEM, 0);
409 if (!res) {
410 dev_err(&plat->dev, "no memory resource found\n");
411 return -ENXIO;
412 }
413
414 ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
415 if (!ramips_fe_base)
416 return -ENOMEM;
417
418 ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
419 if (!ramips_dev) {
420 dev_err(&plat->dev, "alloc_etherdev failed\n");
421 err = -ENOMEM;
422 goto err_unmap;
423 }
424
425 strcpy(ramips_dev->name, "eth%d");
426 ramips_dev->irq = platform_get_irq(plat, 0);
427 if (ramips_dev->irq < 0) {
428 dev_err(&plat->dev, "no IRQ resource found\n");
429 err = -ENXIO;
430 goto err_free_dev;
431 }
432 ramips_dev->addr_len = ETH_ALEN;
433 ramips_dev->base_addr = (unsigned long)ramips_fe_base;
434 ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
435
436 priv = netdev_priv(ramips_dev);
437 priv->plat = data;
438
439 err = register_netdev(ramips_dev);
440 if (err) {
441 dev_err(&plat->dev, "error bringing up device\n");
442 goto err_free_dev;
443 }
444
445 #ifdef CONFIG_RALINK_RT305X
446 rt305x_esw_init();
447 #endif
448 printk(KERN_DEBUG "ramips_eth: loaded\n");
449 return 0;
450
451 err_free_dev:
452 kfree(ramips_dev);
453 err_unmap:
454 iounmap(ramips_fe_base);
455 return err;
456 }
457
458 static int
459 ramips_eth_plat_remove(struct platform_device *plat)
460 {
461 unregister_netdev(ramips_dev);
462 free_netdev(ramips_dev);
463 printk(KERN_DEBUG "ramips_eth: unloaded\n");
464 return 0;
465 }
466
467 static struct platform_driver ramips_eth_driver = {
468 .probe = ramips_eth_plat_probe,
469 .remove = ramips_eth_plat_remove,
470 .driver = {
471 .name = "ramips_eth",
472 .owner = THIS_MODULE,
473 },
474 };
475
476 static int __init
477 ramips_eth_init(void)
478 {
479 int ret = platform_driver_register(&ramips_eth_driver);
480 if (ret)
481 printk(KERN_ERR
482 "ramips_eth: Error registering platfom driver!\n");
483 return ret;
484 }
485
486 static void __exit
487 ramips_eth_cleanup(void)
488 {
489 platform_driver_unregister(&ramips_eth_driver);
490 }
491
492 module_init(ramips_eth_init);
493 module_exit(ramips_eth_cleanup);
494
495 MODULE_LICENSE("GPL");
496 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
497 MODULE_DESCRIPTION("ethernet driver for ramips boards");
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