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