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ramips_eth: add helper functions to {ed,dis}able interrupts
[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 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 void
73 ramips_cleanup_dma(struct raeth_priv *re)
74 {
75 int i;
76
77 for (i = 0; i < NUM_RX_DESC; i++)
78 if (re->rx_skb[i])
79 dev_kfree_skb_any(re->rx_skb[i]);
80
81 if (re->rx)
82 dma_free_coherent(NULL,
83 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
84 re->rx, re->phy_rx);
85
86 if (re->tx)
87 dma_free_coherent(NULL,
88 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
89 re->tx, re->phy_tx);
90 }
91
92 static int
93 ramips_alloc_dma(struct raeth_priv *re)
94 {
95 int err = -ENOMEM;
96 int i;
97
98 re->skb_free_idx = 0;
99
100 /* setup tx ring */
101 re->tx = dma_alloc_coherent(NULL,
102 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
103 &re->phy_tx, GFP_ATOMIC);
104 if (!re->tx)
105 goto err_cleanup;
106
107 memset(re->tx, 0, NUM_TX_DESC * sizeof(struct ramips_tx_dma));
108 for (i = 0; i < NUM_TX_DESC; i++) {
109 re->tx[i].txd2 = TX_DMA_LSO | TX_DMA_DONE;
110 re->tx[i].txd4 = TX_DMA_QN(3) | TX_DMA_PN(1);
111 }
112
113 /* setup rx ring */
114 re->rx = dma_alloc_coherent(NULL,
115 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
116 &re->phy_rx, GFP_ATOMIC);
117 if (!re->rx)
118 goto err_cleanup;
119
120 memset(re->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
121 for (i = 0; i < NUM_RX_DESC; i++) {
122 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
123
124 if (!new_skb)
125 goto err_cleanup;
126
127 skb_reserve(new_skb, 2);
128 re->rx[i].rxd1 = dma_map_single(NULL,
129 skb_put(new_skb, 2),
130 MAX_RX_LENGTH + 2,
131 DMA_FROM_DEVICE);
132 re->rx[i].rxd2 |= RX_DMA_LSO;
133 re->rx_skb[i] = new_skb;
134 }
135
136 return 0;
137
138 err_cleanup:
139 ramips_cleanup_dma(re);
140 return err;
141 }
142
143 static void
144 ramips_setup_dma(struct raeth_priv *re)
145 {
146 ramips_fe_wr(phys_to_bus(re->phy_tx), RAMIPS_TX_BASE_PTR0);
147 ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
148 ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
149 ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
150
151 ramips_fe_wr(phys_to_bus(re->phy_rx), RAMIPS_RX_BASE_PTR0);
152 ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
153 ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
154 ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
155 }
156
157 static int
158 ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
159 {
160 struct raeth_priv *priv = netdev_priv(dev);
161 unsigned long tx;
162 unsigned int tx_next;
163 unsigned int mapped_addr;
164 unsigned long flags;
165
166 if (priv->plat->min_pkt_len) {
167 if (skb->len < priv->plat->min_pkt_len) {
168 if (skb_padto(skb, priv->plat->min_pkt_len)) {
169 printk(KERN_ERR
170 "ramips_eth: skb_padto failed\n");
171 kfree_skb(skb);
172 return 0;
173 }
174 skb_put(skb, priv->plat->min_pkt_len - skb->len);
175 }
176 }
177
178 dev->trans_start = jiffies;
179 mapped_addr = (unsigned int) dma_map_single(NULL, skb->data, skb->len,
180 DMA_TO_DEVICE);
181 dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
182 spin_lock_irqsave(&priv->page_lock, flags);
183 tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
184 tx_next = (tx + 1) % NUM_TX_DESC;
185
186 if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
187 !(priv->tx[tx].txd2 & TX_DMA_DONE) ||
188 !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
189 goto out;
190
191 priv->tx[tx].txd1 = mapped_addr;
192 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
193 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
194 dev->stats.tx_packets++;
195 dev->stats.tx_bytes += skb->len;
196 priv->tx_skb[tx] = skb;
197 wmb();
198 ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
199 spin_unlock_irqrestore(&priv->page_lock, flags);
200 return NETDEV_TX_OK;
201
202 out:
203 spin_unlock_irqrestore(&priv->page_lock, flags);
204 dev->stats.tx_dropped++;
205 kfree_skb(skb);
206 return NETDEV_TX_OK;
207 }
208
209 static void
210 ramips_eth_rx_hw(unsigned long ptr)
211 {
212 struct net_device *dev = (struct net_device *) ptr;
213 struct raeth_priv *priv = netdev_priv(dev);
214 int rx;
215 int max_rx = 16;
216
217 while (max_rx) {
218 struct sk_buff *rx_skb, *new_skb;
219
220 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
221 if (!(priv->rx[rx].rxd2 & RX_DMA_DONE))
222 break;
223 max_rx--;
224
225 rx_skb = priv->rx_skb[rx];
226 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
227 rx_skb->dev = dev;
228 rx_skb->protocol = eth_type_trans(rx_skb, dev);
229 rx_skb->ip_summed = CHECKSUM_NONE;
230 dev->stats.rx_packets++;
231 dev->stats.rx_bytes += rx_skb->len;
232 netif_rx(rx_skb);
233
234 new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + 2);
235 priv->rx_skb[rx] = new_skb;
236 BUG_ON(!new_skb);
237 skb_reserve(new_skb, 2);
238 priv->rx[rx].rxd1 = dma_map_single(NULL,
239 new_skb->data,
240 MAX_RX_LENGTH + 2,
241 DMA_FROM_DEVICE);
242 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
243 wmb();
244 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
245 }
246
247 if (max_rx == 0)
248 tasklet_schedule(&priv->rx_tasklet);
249 else
250 ramips_fe_int_enable(RAMIPS_RX_DLY_INT);
251 }
252
253 static void
254 ramips_eth_tx_housekeeping(unsigned long ptr)
255 {
256 struct net_device *dev = (struct net_device*)ptr;
257 struct raeth_priv *priv = netdev_priv(dev);
258
259 while ((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
260 (priv->tx_skb[priv->skb_free_idx])) {
261 dev_kfree_skb_irq(priv->tx_skb[priv->skb_free_idx]);
262 priv->tx_skb[priv->skb_free_idx] = 0;
263 priv->skb_free_idx++;
264 if (priv->skb_free_idx >= NUM_TX_DESC)
265 priv->skb_free_idx = 0;
266 }
267
268 ramips_fe_int_enable(RAMIPS_TX_DLY_INT);
269 }
270
271 static int
272 ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
273 {
274 unsigned char *mac = priv;
275
276 if (netif_running(dev))
277 return -EBUSY;
278
279 memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
280 ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
281 ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
282 RAMIPS_GDMA1_MAC_ADRL);
283 return 0;
284 }
285
286 static void
287 ramips_eth_timeout(struct net_device *dev)
288 {
289 struct raeth_priv *priv = netdev_priv(dev);
290
291 tasklet_schedule(&priv->tx_housekeeping_tasklet);
292 }
293
294 static irqreturn_t
295 ramips_eth_irq(int irq, void *dev)
296 {
297 struct raeth_priv *priv = netdev_priv(dev);
298 unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
299
300 ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
301
302 if (fe_int & RAMIPS_RX_DLY_INT) {
303 ramips_fe_int_disable(RAMIPS_RX_DLY_INT);
304 tasklet_schedule(&priv->rx_tasklet);
305 }
306
307 if (fe_int & RAMIPS_TX_DLY_INT)
308 ramips_eth_tx_housekeeping((unsigned long)dev);
309
310 return IRQ_HANDLED;
311 }
312
313 static int
314 ramips_eth_open(struct net_device *dev)
315 {
316 struct raeth_priv *priv = netdev_priv(dev);
317 int err;
318
319 err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
320 dev->name, dev);
321 if (err)
322 return err;
323
324 err = ramips_alloc_dma(priv);
325 if (err)
326 goto err_free_irq;
327
328 ramips_setup_dma(priv);
329 ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
330 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
331 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
332 RAMIPS_PDMA_GLO_CFG);
333 ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
334 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
335 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
336 RAMIPS_FE_GLO_CFG);
337
338 tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
339 (unsigned long)dev);
340 tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
341
342 ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
343 ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
344 ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
345 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
346 RAMIPS_GDMA1_FWD_CFG);
347 ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
348 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
349 RAMIPS_CDMA_CSG_CFG);
350 ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
351 ramips_fe_wr(1, RAMIPS_FE_RST_GL);
352 ramips_fe_wr(0, RAMIPS_FE_RST_GL);
353
354 netif_start_queue(dev);
355 return 0;
356
357 err_free_irq:
358 free_irq(dev->irq, dev);
359 return err;
360 }
361
362 static int
363 ramips_eth_stop(struct net_device *dev)
364 {
365 struct raeth_priv *priv = netdev_priv(dev);
366
367 ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
368 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
369 RAMIPS_PDMA_GLO_CFG);
370 free_irq(dev->irq, dev);
371 netif_stop_queue(dev);
372 tasklet_kill(&priv->tx_housekeeping_tasklet);
373 tasklet_kill(&priv->rx_tasklet);
374 ramips_cleanup_dma(priv);
375 printk(KERN_DEBUG "ramips_eth: stopped\n");
376 return 0;
377 }
378
379 static int __init
380 ramips_eth_probe(struct net_device *dev)
381 {
382 struct raeth_priv *priv = netdev_priv(dev);
383 struct sockaddr addr;
384
385 BUG_ON(!priv->plat->reset_fe);
386 priv->plat->reset_fe();
387 net_srandom(jiffies);
388 memcpy(addr.sa_data, priv->plat->mac, 6);
389 ramips_eth_set_mac_addr(dev, &addr);
390
391 ether_setup(dev);
392 dev->mtu = 1500;
393 dev->watchdog_timeo = TX_TIMEOUT;
394 spin_lock_init(&priv->page_lock);
395
396 return 0;
397 }
398
399 static const struct net_device_ops ramips_eth_netdev_ops = {
400 .ndo_init = ramips_eth_probe,
401 .ndo_open = ramips_eth_open,
402 .ndo_stop = ramips_eth_stop,
403 .ndo_start_xmit = ramips_eth_hard_start_xmit,
404 .ndo_tx_timeout = ramips_eth_timeout,
405 .ndo_change_mtu = eth_change_mtu,
406 .ndo_set_mac_address = ramips_eth_set_mac_addr,
407 .ndo_validate_addr = eth_validate_addr,
408 };
409
410 static int
411 ramips_eth_plat_probe(struct platform_device *plat)
412 {
413 struct raeth_priv *priv;
414 struct ramips_eth_platform_data *data = plat->dev.platform_data;
415 struct resource *res;
416 int err;
417
418 if (!data) {
419 dev_err(&plat->dev, "no platform data specified\n");
420 return -EINVAL;
421 }
422
423 res = platform_get_resource(plat, IORESOURCE_MEM, 0);
424 if (!res) {
425 dev_err(&plat->dev, "no memory resource found\n");
426 return -ENXIO;
427 }
428
429 ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
430 if (!ramips_fe_base)
431 return -ENOMEM;
432
433 ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
434 if (!ramips_dev) {
435 dev_err(&plat->dev, "alloc_etherdev failed\n");
436 err = -ENOMEM;
437 goto err_unmap;
438 }
439
440 strcpy(ramips_dev->name, "eth%d");
441 ramips_dev->irq = platform_get_irq(plat, 0);
442 if (ramips_dev->irq < 0) {
443 dev_err(&plat->dev, "no IRQ resource found\n");
444 err = -ENXIO;
445 goto err_free_dev;
446 }
447 ramips_dev->addr_len = ETH_ALEN;
448 ramips_dev->base_addr = (unsigned long)ramips_fe_base;
449 ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
450
451 priv = netdev_priv(ramips_dev);
452 priv->plat = data;
453
454 err = register_netdev(ramips_dev);
455 if (err) {
456 dev_err(&plat->dev, "error bringing up device\n");
457 goto err_free_dev;
458 }
459
460 #ifdef CONFIG_RALINK_RT305X
461 rt305x_esw_init();
462 #endif
463 printk(KERN_DEBUG "ramips_eth: loaded\n");
464 return 0;
465
466 err_free_dev:
467 kfree(ramips_dev);
468 err_unmap:
469 iounmap(ramips_fe_base);
470 return err;
471 }
472
473 static int
474 ramips_eth_plat_remove(struct platform_device *plat)
475 {
476 unregister_netdev(ramips_dev);
477 free_netdev(ramips_dev);
478 printk(KERN_DEBUG "ramips_eth: unloaded\n");
479 return 0;
480 }
481
482 static struct platform_driver ramips_eth_driver = {
483 .probe = ramips_eth_plat_probe,
484 .remove = ramips_eth_plat_remove,
485 .driver = {
486 .name = "ramips_eth",
487 .owner = THIS_MODULE,
488 },
489 };
490
491 static int __init
492 ramips_eth_init(void)
493 {
494 int ret = platform_driver_register(&ramips_eth_driver);
495 if (ret)
496 printk(KERN_ERR
497 "ramips_eth: Error registering platfom driver!\n");
498 return ret;
499 }
500
501 static void __exit
502 ramips_eth_cleanup(void)
503 {
504 platform_driver_unregister(&ramips_eth_driver);
505 }
506
507 module_init(ramips_eth_init);
508 module_exit(ramips_eth_cleanup);
509
510 MODULE_LICENSE("GPL");
511 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
512 MODULE_DESCRIPTION("ethernet driver for ramips boards");
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