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fixes dma hangups in eth
[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; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
15 *
16 * Copyright (C) 2009 John Crispin <blogic@openwrt.org>
17 */
18
19 #include <linux/module.h>
20 #include <linux/version.h>
21 #include <linux/kernel.h>
22 #include <linux/types.h>
23 #include <linux/pci.h>
24 #include <linux/init.h>
25 #include <linux/skbuff.h>
26 #include <linux/if_vlan.h>
27 #include <linux/if_ether.h>
28 #include <linux/platform_device.h>
29 #include <asm/uaccess.h>
30 #include <net/sock.h>
31 #include <asm/uaccess.h>
32
33 #include <eth.h>
34
35 #define TX_TIMEOUT (20 * HZ / 100)
36 #define MAX_RX_LENGTH 1500
37
38 #ifdef CONFIG_RALINK_RT305X
39 #include "ramips_esw.c"
40 #endif
41
42 static struct net_device * ramips_dev;
43 static void __iomem *ramips_fe_base = 0;
44
45 static inline void
46 ramips_fe_wr(u32 val, unsigned reg)
47 {
48 __raw_writel(val, ramips_fe_base + reg);
49 }
50
51 static inline u32
52 ramips_fe_rr(unsigned reg)
53 {
54 return __raw_readl(ramips_fe_base + reg);
55 }
56
57 static int
58 ramips_alloc_dma(struct net_device *dev)
59 {
60 #define phys_to_bus(a) (a & 0x1FFFFFFF)
61 struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
62 int i;
63
64 priv->skb_free_idx = 0;
65
66 /* setup tx ring */
67 priv->tx = pci_alloc_consistent(NULL,
68 NUM_TX_DESC * sizeof(struct ramips_tx_dma), &priv->phy_tx);
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 = pci_alloc_consistent(NULL,
83 NUM_RX_DESC * sizeof(struct ramips_rx_dma), &priv->phy_rx);
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 dma_cache_wback_inv((unsigned long)priv->rx,
97 NUM_RX_DESC * (sizeof(struct ramips_rx_dma)));
98
99 ramips_fe_wr(phys_to_bus(priv->phy_rx), RAMIPS_RX_BASE_PTR0);
100 ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
101 ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
102 ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
103
104 return 0;
105 }
106
107 static int
108 ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
109 {
110 struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
111 unsigned long tx;
112 unsigned int tx_next;
113
114 if(priv->plat->min_pkt_len)
115 {
116 if(skb->len < priv->plat->min_pkt_len)
117 {
118 if(skb_padto(skb, priv->plat->min_pkt_len))
119 {
120 printk(KERN_ERR "ramips_eth: skb_padto failed\n");
121 kfree_skb(skb);
122 return 0;
123 }
124 skb_put(skb, priv->plat->min_pkt_len - skb->len);
125 }
126 }
127 dev->trans_start = jiffies;
128 dma_cache_wback_inv((unsigned long)skb->data, skb->len);
129 tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
130 if(tx == NUM_TX_DESC - 1)
131 tx_next = 0;
132 else
133 tx_next = tx + 1;
134 if((priv->tx_skb[tx]== 0) && (priv->tx_skb[tx_next] == 0))
135 {
136 if(!(priv->tx[tx].txd2 & TX_DMA_DONE))
137 {
138 kfree_skb(skb);
139 priv->stat.tx_dropped++;
140 printk(KERN_ERR "%s: dropping\n", dev->name);
141 return 0;
142 }
143 priv->tx[tx].txd1 = virt_to_phys(skb->data);
144 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
145 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
146 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
147 priv->stat.tx_packets++;
148 priv->stat.tx_bytes += skb->len;
149 priv->tx_skb[tx] = skb;
150 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
151 } else {
152 priv->stat.tx_dropped++;
153 kfree_skb(skb);
154 }
155 return 0;
156 }
157
158 static void
159 ramips_eth_rx_hw(unsigned long ptr)
160 {
161 struct net_device *dev = (struct net_device*)ptr;
162 struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
163 int rx;
164 int max_rx = 16;
165
166 while(max_rx)
167 {
168 struct sk_buff *rx_skb, *new_skb;
169
170 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
171 if(!(priv->rx[rx].rxd2 & RX_DMA_DONE))
172 break;
173 max_rx--;
174
175 rx_skb = priv->rx_skb[rx];
176 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
177 rx_skb->tail = rx_skb->data + rx_skb->len;
178 rx_skb->dev = dev;
179 rx_skb->protocol = eth_type_trans(rx_skb, dev);
180 rx_skb->ip_summed = CHECKSUM_NONE;
181 priv->stat.rx_packets++;
182 priv->stat.rx_bytes += rx_skb->len;
183 netif_rx(rx_skb);
184
185 new_skb = __dev_alloc_skb(MAX_RX_LENGTH + 2, GFP_DMA | GFP_ATOMIC);
186 priv->rx_skb[rx] = new_skb;
187 BUG_ON(!new_skb);
188 skb_reserve(new_skb, 2);
189 priv->rx[rx].rxd1 =
190 dma_map_single(NULL, new_skb->data, MAX_RX_LENGTH + 2,
191 PCI_DMA_FROMDEVICE);
192 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
193 dma_cache_wback_inv((unsigned long)&priv->rx[rx],
194 sizeof(struct ramips_rx_dma));
195 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
196 }
197 if(max_rx == 0)
198 tasklet_schedule(&priv->rx_tasklet);
199 else
200 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
201 RAMIPS_FE_INT_ENABLE);
202 }
203
204 static void
205 ramips_eth_tx_housekeeping(unsigned long ptr)
206 {
207 struct net_device *dev = (struct net_device*)ptr;
208 struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
209
210 while((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
211 (priv->tx_skb[priv->skb_free_idx]))
212 {
213 dev_kfree_skb_irq((struct sk_buff*)priv->tx_skb[priv->skb_free_idx]);
214 priv->tx_skb[priv->skb_free_idx] = 0;
215 priv->skb_free_idx++;
216 if(priv->skb_free_idx >= NUM_TX_DESC)
217 priv->skb_free_idx = 0;
218 }
219 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
220 RAMIPS_FE_INT_ENABLE);
221 }
222
223 static struct net_device_stats*
224 ramips_eth_get_stats(struct net_device *dev)
225 {
226 return &((struct raeth_priv*)netdev_priv(dev))->stat;
227 }
228
229 static int
230 ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
231 {
232 unsigned char *mac = (unsigned char*)priv;
233
234 if(netif_running(dev))
235 return -EBUSY;
236 memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
237 ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
238 ramips_fe_wr(RAMIPS_GDMA1_MAC_ADRL,
239 (mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5]);
240 return 0;
241 }
242
243 static void
244 ramips_eth_timeout(struct net_device *dev)
245 {
246 tasklet_schedule(
247 &((struct raeth_priv*)netdev_priv(dev))->tx_housekeeping_tasklet);
248 }
249
250 static irqreturn_t
251 ramips_eth_irq(int irq, void *dev)
252 {
253 struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
254 unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
255
256 if(fe_int & RAMIPS_RX_DLY_INT)
257 {
258 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~(RAMIPS_RX_DLY_INT),
259 RAMIPS_FE_INT_ENABLE);
260 tasklet_schedule(&priv->rx_tasklet);
261 }
262 if(fe_int & RAMIPS_TX_DLY_INT)
263 tasklet_schedule(&priv->tx_housekeeping_tasklet);
264 ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
265 return IRQ_HANDLED;
266 }
267
268 static int
269 ramips_eth_open(struct net_device *dev)
270 {
271 struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
272
273 ramips_alloc_dma(dev);
274 ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
275 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
276 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
277 RAMIPS_PDMA_GLO_CFG);
278 ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
279 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
280 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
281 RAMIPS_FE_GLO_CFG);
282 request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED, dev->name, dev);
283 tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
284 (unsigned long)dev);
285 tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
286 ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
287 ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
288 ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
289 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
290 RAMIPS_GDMA1_FWD_CFG);
291 ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
292 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
293 RAMIPS_CDMA_CSG_CFG);
294 ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
295 ramips_fe_wr(1, RAMIPS_FE_RST_GL);
296 ramips_fe_wr(0, RAMIPS_FE_RST_GL);
297 netif_start_queue(dev);
298 return 0;
299 }
300
301 static int
302 ramips_eth_stop(struct net_device *dev)
303 {
304 struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
305
306 ramips_fe_wr(RAMIPS_PDMA_GLO_CFG, ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
307 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN));
308 free_irq(dev->irq, dev);
309 netif_stop_queue(dev);
310 tasklet_kill(&priv->tx_housekeeping_tasklet);
311 tasklet_kill(&priv->rx_tasklet);
312 pci_free_consistent(NULL, NUM_TX_DESC * sizeof(struct ramips_tx_dma),
313 priv->tx, priv->phy_tx);
314 pci_free_consistent(NULL, NUM_RX_DESC * sizeof(struct ramips_rx_dma),
315 priv->rx, priv->phy_rx);
316 printk(KERN_INFO "ramips_eth: stopped\n");
317 return 0;
318 }
319
320 int __init
321 ramips_eth_probe(struct net_device *dev)
322 {
323 struct raeth_priv *priv = (struct raeth_priv*)netdev_priv(dev);
324 struct sockaddr addr;
325
326 BUG_ON(!priv->plat->reset_fe);
327 priv->plat->reset_fe();
328 net_srandom(jiffies);
329 memcpy(addr.sa_data, priv->plat->mac, 6);
330 ramips_eth_set_mac_addr(dev, &addr);
331
332 ether_setup(dev);
333 dev->open = ramips_eth_open;
334 dev->stop = ramips_eth_stop;
335 dev->hard_start_xmit = ramips_eth_hard_start_xmit;
336 dev->get_stats = ramips_eth_get_stats;
337 dev->set_mac_address = ramips_eth_set_mac_addr;
338 dev->mtu = MAX_RX_LENGTH;
339 dev->tx_timeout = ramips_eth_timeout;
340 dev->watchdog_timeo = TX_TIMEOUT;
341 return 0;
342 }
343
344 static int
345 ramips_eth_plat_probe(struct platform_device *plat)
346 {
347 struct raeth_priv *priv;
348 struct ramips_eth_platform_data *data =
349 (struct ramips_eth_platform_data*)plat->dev.platform_data;
350 ramips_fe_base = ioremap_nocache(data->base_addr, PAGE_SIZE);
351 if(!ramips_fe_base)
352 return -ENOMEM;
353 ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
354 if(!ramips_dev)
355 return -ENOMEM;
356 strcpy(ramips_dev->name, "eth%d");
357 ramips_dev->irq = data->irq;
358 ramips_dev->addr_len = ETH_ALEN;
359 ramips_dev->base_addr = (unsigned long)ramips_fe_base;
360 ramips_dev->init = ramips_eth_probe;
361 priv = (struct raeth_priv*)netdev_priv(ramips_dev);
362 priv->plat = data;
363 if(register_netdev(ramips_dev))
364 {
365 printk(KERN_ERR "ramips_eth: error bringing up device\n");
366 return -ENXIO;
367 }
368 #ifdef CONFIG_RALINK_RT305X
369 rt305x_esw_init();
370 #endif
371 printk(KERN_INFO "ramips_eth: loaded\n");
372 return 0;
373 }
374
375 static int
376 ramips_eth_plat_remove(struct platform_device *plat)
377 {
378 unregister_netdev(ramips_dev);
379 free_netdev(ramips_dev);
380 printk(KERN_INFO "ramips_eth: unloaded");
381 return 0;
382 }
383
384 static struct platform_driver ramips_eth_driver = {
385 .probe = ramips_eth_plat_probe,
386 .remove = ramips_eth_plat_remove,
387 .driver = {
388 .name = "ramips_eth",
389 .owner = THIS_MODULE,
390 },
391 };
392
393 int __init ramips_eth_init(void)
394 {
395 int ret = platform_driver_register(&ramips_eth_driver);
396 if (ret)
397 printk(KERN_INFO "ramips_eth: Error registering platfom driver!");
398 return ret;
399 }
400
401 static void __exit ramips_eth_cleanup(void)
402 {
403 platform_driver_unregister(&ramips_eth_driver);
404 }
405
406 module_init(ramips_eth_init);
407 module_exit(ramips_eth_cleanup);
408
409 MODULE_LICENSE("GPL");
410 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
411 MODULE_DESCRIPTION("ethernet driver for ramips boards");
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