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