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[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/version.h>
20 #include <linux/kernel.h>
21 #include <linux/types.h>
22 #include <linux/pci.h>
23 #include <linux/init.h>
24 #include <linux/skbuff.h>
25 #include <linux/if_vlan.h>
26 #include <linux/if_ether.h>
27 #include <linux/platform_device.h>
28 #include <asm/uaccess.h>
29 #include <net/sock.h>
30 #include <asm/uaccess.h>
31
32 #include <eth.h>
33
34 #define TX_TIMEOUT (20 * HZ / 100)
35 #define MAX_RX_LENGTH 1500
36
37 #ifdef CONFIG_RALINK_RT305X
38 #include "ramips_esw.c"
39 #endif
40
41 #define phys_to_bus(a) (a & 0x1FFFFFFF)
42
43 static struct net_device * ramips_dev;
44 static void __iomem *ramips_fe_base = 0;
45
46 static inline void
47 ramips_fe_wr(u32 val, unsigned reg)
48 {
49 __raw_writel(val, ramips_fe_base + reg);
50 }
51
52 static inline u32
53 ramips_fe_rr(unsigned reg)
54 {
55 return __raw_readl(ramips_fe_base + reg);
56 }
57
58 static int
59 ramips_alloc_dma(struct net_device *dev)
60 {
61 struct raeth_priv *priv = netdev_priv(dev);
62 int i;
63
64 priv->skb_free_idx = 0;
65
66 /* setup tx ring */
67 priv->tx = dma_alloc_coherent(NULL,
68 NUM_TX_DESC * sizeof(struct ramips_tx_dma), &priv->phy_tx, GFP_ATOMIC);
69 for(i = 0; i < NUM_TX_DESC; i++)
70 {
71 memset(&priv->tx[i], 0, sizeof(struct ramips_tx_dma));
72 priv->tx[i].txd2 |= TX_DMA_LSO | TX_DMA_DONE;
73 priv->tx[i].txd4 &= (TX_DMA_QN_MASK | TX_DMA_PN_MASK);
74 priv->tx[i].txd4 |= TX_DMA_QN(3) | TX_DMA_PN(1);
75 }
76 ramips_fe_wr(phys_to_bus(priv->phy_tx), RAMIPS_TX_BASE_PTR0);
77 ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
78 ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
79 ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
80
81 /* setup rx ring */
82 priv->rx = dma_alloc_coherent(NULL,
83 NUM_RX_DESC * sizeof(struct ramips_rx_dma), &priv->phy_rx, GFP_ATOMIC);
84 memset(priv->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
85 for(i = 0; i < NUM_RX_DESC; i++)
86 {
87 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
88 BUG_ON(!new_skb);
89 skb_reserve(new_skb, 2);
90 priv->rx[i].rxd1 =
91 dma_map_single(NULL, skb_put(new_skb, 2), MAX_RX_LENGTH + 2,
92 PCI_DMA_FROMDEVICE);
93 priv->rx[i].rxd2 |= RX_DMA_LSO;
94 priv->rx_skb[i] = new_skb;
95 }
96 ramips_fe_wr(phys_to_bus(priv->phy_rx), RAMIPS_RX_BASE_PTR0);
97 ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
98 ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
99 ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
100
101 return 0;
102 }
103
104 static int
105 ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
106 {
107 struct raeth_priv *priv = netdev_priv(dev);
108 unsigned long tx;
109 unsigned int tx_next;
110 unsigned int mapped_addr;
111 if(priv->plat->min_pkt_len)
112 {
113 if(skb->len < priv->plat->min_pkt_len)
114 {
115 if(skb_padto(skb, priv->plat->min_pkt_len))
116 {
117 printk(KERN_ERR "ramips_eth: skb_padto failed\n");
118 kfree_skb(skb);
119 return 0;
120 }
121 skb_put(skb, priv->plat->min_pkt_len - skb->len);
122 }
123 }
124 dev->trans_start = jiffies;
125 mapped_addr = (unsigned int)dma_map_single(NULL, skb->data, skb->len,
126 PCI_DMA_TODEVICE);
127 dma_sync_single_for_device(NULL, mapped_addr, skb->len, PCI_DMA_TODEVICE);
128 tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
129 if(tx == NUM_TX_DESC - 1)
130 tx_next = 0;
131 else
132 tx_next = tx + 1;
133 if((priv->tx_skb[tx]== 0) && (priv->tx_skb[tx_next] == 0))
134 {
135 if(!(priv->tx[tx].txd2 & TX_DMA_DONE))
136 {
137 kfree_skb(skb);
138 dev->stats.tx_dropped++;
139 printk(KERN_ERR "%s: dropping\n", dev->name);
140 return 0;
141 }
142 priv->tx[tx].txd1 = virt_to_phys(skb->data);
143 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
144 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
145 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
146 dev->stats.tx_packets++;
147 dev->stats.tx_bytes += skb->len;
148 priv->tx_skb[tx] = skb;
149 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
150 } else {
151 dev->stats.tx_dropped++;
152 kfree_skb(skb);
153 }
154 return 0;
155 }
156
157 static void
158 ramips_eth_rx_hw(unsigned long ptr)
159 {
160 struct net_device *dev = (struct net_device*)ptr;
161 struct raeth_priv *priv = netdev_priv(dev);
162 int rx;
163 int max_rx = 16;
164
165 while(max_rx)
166 {
167 struct sk_buff *rx_skb, *new_skb;
168
169 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
170 if(!(priv->rx[rx].rxd2 & RX_DMA_DONE))
171 break;
172 max_rx--;
173
174 rx_skb = priv->rx_skb[rx];
175 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
176 rx_skb->tail = rx_skb->data + rx_skb->len;
177 rx_skb->dev = dev;
178 rx_skb->protocol = eth_type_trans(rx_skb, dev);
179 rx_skb->ip_summed = CHECKSUM_NONE;
180 dev->stats.rx_packets++;
181 dev->stats.rx_bytes += rx_skb->len;
182 netif_rx(rx_skb);
183
184 new_skb = __dev_alloc_skb(MAX_RX_LENGTH + 2, GFP_DMA | GFP_ATOMIC);
185 priv->rx_skb[rx] = new_skb;
186 BUG_ON(!new_skb);
187 skb_reserve(new_skb, 2);
188 priv->rx[rx].rxd1 =
189 dma_map_single(NULL, new_skb->data, MAX_RX_LENGTH + 2,
190 PCI_DMA_FROMDEVICE);
191 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
192 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
193 }
194 if(max_rx == 0)
195 tasklet_schedule(&priv->rx_tasklet);
196 else
197 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
198 RAMIPS_FE_INT_ENABLE);
199 }
200
201 static void
202 ramips_eth_tx_housekeeping(unsigned long ptr)
203 {
204 struct net_device *dev = (struct net_device*)ptr;
205 struct raeth_priv *priv = netdev_priv(dev);
206
207 while((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
208 (priv->tx_skb[priv->skb_free_idx]))
209 {
210 dev_kfree_skb_irq((struct sk_buff*)priv->tx_skb[priv->skb_free_idx]);
211 priv->tx_skb[priv->skb_free_idx] = 0;
212 priv->skb_free_idx++;
213 if(priv->skb_free_idx >= NUM_TX_DESC)
214 priv->skb_free_idx = 0;
215 }
216 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
217 RAMIPS_FE_INT_ENABLE);
218 }
219
220 static int
221 ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
222 {
223 unsigned char *mac = (unsigned char*)priv;
224
225 if(netif_running(dev))
226 return -EBUSY;
227 memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
228 ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
229 ramips_fe_wr(RAMIPS_GDMA1_MAC_ADRL,
230 (mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5]);
231 return 0;
232 }
233
234 static void
235 ramips_eth_timeout(struct net_device *dev)
236 {
237 struct raeth_priv *priv = netdev_priv(dev);
238
239 tasklet_schedule(&priv->tx_housekeeping_tasklet);
240 }
241
242 static irqreturn_t
243 ramips_eth_irq(int irq, void *dev)
244 {
245 struct raeth_priv *priv = netdev_priv(dev);
246 unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
247
248 ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
249
250 if(fe_int & RAMIPS_RX_DLY_INT)
251 {
252 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~(RAMIPS_RX_DLY_INT),
253 RAMIPS_FE_INT_ENABLE);
254 tasklet_schedule(&priv->rx_tasklet);
255 }
256 if(fe_int & RAMIPS_TX_DLY_INT)
257 ramips_eth_tx_housekeeping((unsigned long)dev);
258 return IRQ_HANDLED;
259 }
260
261 static int
262 ramips_eth_open(struct net_device *dev)
263 {
264 struct raeth_priv *priv = netdev_priv(dev);
265
266 ramips_alloc_dma(dev);
267 ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
268 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
269 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
270 RAMIPS_PDMA_GLO_CFG);
271 ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
272 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
273 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
274 RAMIPS_FE_GLO_CFG);
275 request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED, dev->name, dev);
276 tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
277 (unsigned long)dev);
278 tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
279 ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
280 ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
281 ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
282 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
283 RAMIPS_GDMA1_FWD_CFG);
284 ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
285 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
286 RAMIPS_CDMA_CSG_CFG);
287 ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
288 ramips_fe_wr(1, RAMIPS_FE_RST_GL);
289 ramips_fe_wr(0, RAMIPS_FE_RST_GL);
290 netif_start_queue(dev);
291 return 0;
292 }
293
294 static int
295 ramips_eth_stop(struct net_device *dev)
296 {
297 struct raeth_priv *priv = netdev_priv(dev);
298
299 ramips_fe_wr(RAMIPS_PDMA_GLO_CFG, ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
300 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN));
301 free_irq(dev->irq, dev);
302 netif_stop_queue(dev);
303 tasklet_kill(&priv->tx_housekeeping_tasklet);
304 tasklet_kill(&priv->rx_tasklet);
305 pci_free_consistent(NULL, NUM_TX_DESC * sizeof(struct ramips_tx_dma),
306 priv->tx, priv->phy_tx);
307 pci_free_consistent(NULL, NUM_RX_DESC * sizeof(struct ramips_rx_dma),
308 priv->rx, priv->phy_rx);
309 printk(KERN_DEBUG "ramips_eth: stopped\n");
310 return 0;
311 }
312
313 static int __init
314 ramips_eth_probe(struct net_device *dev)
315 {
316 struct raeth_priv *priv = netdev_priv(dev);
317 struct sockaddr addr;
318
319 BUG_ON(!priv->plat->reset_fe);
320 priv->plat->reset_fe();
321 net_srandom(jiffies);
322 memcpy(addr.sa_data, priv->plat->mac, 6);
323 ramips_eth_set_mac_addr(dev, &addr);
324
325 ether_setup(dev);
326 dev->open = ramips_eth_open;
327 dev->stop = ramips_eth_stop;
328 dev->hard_start_xmit = ramips_eth_hard_start_xmit;
329 dev->set_mac_address = ramips_eth_set_mac_addr;
330 dev->mtu = MAX_RX_LENGTH;
331 dev->tx_timeout = ramips_eth_timeout;
332 dev->watchdog_timeo = TX_TIMEOUT;
333 return 0;
334 }
335
336 static int
337 ramips_eth_plat_probe(struct platform_device *plat)
338 {
339 struct raeth_priv *priv;
340 struct ramips_eth_platform_data *data = plat->dev.platform_data;
341 int err;
342
343 if (!data) {
344 dev_err(&plat->dev, "no platform data specified\n");
345 return -EINVAL;
346 }
347
348 ramips_fe_base = ioremap_nocache(data->base_addr, PAGE_SIZE);
349 if(!ramips_fe_base)
350 return -ENOMEM;
351
352 ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
353 if(!ramips_dev) {
354 dev_err(&plat->dev, "alloc_etherdev failed\n");
355 err = -ENOMEM;
356 goto err_unmap;
357 }
358
359 strcpy(ramips_dev->name, "eth%d");
360 ramips_dev->irq = data->irq;
361 ramips_dev->addr_len = ETH_ALEN;
362 ramips_dev->base_addr = (unsigned long)ramips_fe_base;
363 ramips_dev->init = ramips_eth_probe;
364 priv = (struct raeth_priv*)netdev_priv(ramips_dev);
365 priv->plat = data;
366
367 err = register_netdev(ramips_dev);
368 if (err) {
369 dev_err(&plat->dev, "error bringing up device\n");
370 goto err_free_dev;
371 }
372
373 #ifdef CONFIG_RALINK_RT305X
374 rt305x_esw_init();
375 #endif
376 printk(KERN_DEBUG "ramips_eth: loaded\n");
377 return 0;
378
379 err_free_dev:
380 kfree(ramips_dev);
381 err_unmap:
382 iounmap(ramips_fe_base);
383 return err;
384 }
385
386 static int
387 ramips_eth_plat_remove(struct platform_device *plat)
388 {
389 unregister_netdev(ramips_dev);
390 free_netdev(ramips_dev);
391 printk(KERN_DEBUG "ramips_eth: unloaded\n");
392 return 0;
393 }
394
395 static struct platform_driver ramips_eth_driver = {
396 .probe = ramips_eth_plat_probe,
397 .remove = ramips_eth_plat_remove,
398 .driver = {
399 .name = "ramips_eth",
400 .owner = THIS_MODULE,
401 },
402 };
403
404 static int __init
405 ramips_eth_init(void)
406 {
407 int ret = platform_driver_register(&ramips_eth_driver);
408 if (ret)
409 printk(KERN_ERR
410 "ramips_eth: Error registering platfom driver!\n");
411 return ret;
412 }
413
414 static void __exit
415 ramips_eth_cleanup(void)
416 {
417 platform_driver_unregister(&ramips_eth_driver);
418 }
419
420 module_init(ramips_eth_init);
421 module_exit(ramips_eth_cleanup);
422
423 MODULE_LICENSE("GPL");
424 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
425 MODULE_DESCRIPTION("ethernet driver for ramips boards");
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