[ramips] clean up dma api of ethernet driver
[openwrt/svn-archive/archive.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 #define phys_to_bus(a) (a & 0x1FFFFFFF)
43
44 static struct net_device * ramips_dev;
45 static void __iomem *ramips_fe_base = 0;
46
47 static inline void
48 ramips_fe_wr(u32 val, unsigned reg)
49 {
50 __raw_writel(val, ramips_fe_base + reg);
51 }
52
53 static inline u32
54 ramips_fe_rr(unsigned reg)
55 {
56 return __raw_readl(ramips_fe_base + reg);
57 }
58
59 static int
60 ramips_alloc_dma(struct net_device *dev)
61 {
62 struct raeth_priv *priv = netdev_priv(dev);
63 int i;
64
65 priv->skb_free_idx = 0;
66
67 /* setup tx ring */
68 priv->tx = dma_alloc_coherent(NULL,
69 NUM_TX_DESC * sizeof(struct ramips_tx_dma), &priv->phy_tx, GFP_ATOMIC);
70 for(i = 0; i < NUM_TX_DESC; i++)
71 {
72 memset(&priv->tx[i], 0, sizeof(struct ramips_tx_dma));
73 priv->tx[i].txd2 |= TX_DMA_LSO | TX_DMA_DONE;
74 priv->tx[i].txd4 &= (TX_DMA_QN_MASK | TX_DMA_PN_MASK);
75 priv->tx[i].txd4 |= TX_DMA_QN(3) | TX_DMA_PN(1);
76 }
77 ramips_fe_wr(phys_to_bus(priv->phy_tx), RAMIPS_TX_BASE_PTR0);
78 ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
79 ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
80 ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
81
82 /* setup rx ring */
83 priv->rx = dma_alloc_coherent(NULL,
84 NUM_RX_DESC * sizeof(struct ramips_rx_dma), &priv->phy_rx, GFP_ATOMIC);
85 memset(priv->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
86 for(i = 0; i < NUM_RX_DESC; i++)
87 {
88 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
89 BUG_ON(!new_skb);
90 skb_reserve(new_skb, 2);
91 priv->rx[i].rxd1 =
92 dma_map_single(NULL, skb_put(new_skb, 2), MAX_RX_LENGTH + 2,
93 PCI_DMA_FROMDEVICE);
94 priv->rx[i].rxd2 |= RX_DMA_LSO;
95 priv->rx_skb[i] = new_skb;
96 }
97 ramips_fe_wr(phys_to_bus(priv->phy_rx), RAMIPS_RX_BASE_PTR0);
98 ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
99 ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
100 ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
101
102 return 0;
103 }
104
105 static int
106 ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
107 {
108 struct raeth_priv *priv = netdev_priv(dev);
109 unsigned long tx;
110 unsigned int tx_next;
111 unsigned int mapped_addr;
112 if(priv->plat->min_pkt_len)
113 {
114 if(skb->len < priv->plat->min_pkt_len)
115 {
116 if(skb_padto(skb, priv->plat->min_pkt_len))
117 {
118 printk(KERN_ERR "ramips_eth: skb_padto failed\n");
119 kfree_skb(skb);
120 return 0;
121 }
122 skb_put(skb, priv->plat->min_pkt_len - skb->len);
123 }
124 }
125 dev->trans_start = jiffies;
126 mapped_addr = (unsigned int)dma_map_single(NULL, skb->data, skb->len,
127 PCI_DMA_TODEVICE);
128 dma_sync_single_for_device(NULL, mapped_addr, skb->len, PCI_DMA_TODEVICE);
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 dev->stats.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 dev->stats.tx_packets++;
148 dev->stats.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 dev->stats.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 = 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 dev->stats.rx_packets++;
182 dev->stats.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 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
194 }
195 if(max_rx == 0)
196 tasklet_schedule(&priv->rx_tasklet);
197 else
198 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
199 RAMIPS_FE_INT_ENABLE);
200 }
201
202 static void
203 ramips_eth_tx_housekeeping(unsigned long ptr)
204 {
205 struct net_device *dev = (struct net_device*)ptr;
206 struct raeth_priv *priv = netdev_priv(dev);
207
208 while((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
209 (priv->tx_skb[priv->skb_free_idx]))
210 {
211 dev_kfree_skb_irq((struct sk_buff*)priv->tx_skb[priv->skb_free_idx]);
212 priv->tx_skb[priv->skb_free_idx] = 0;
213 priv->skb_free_idx++;
214 if(priv->skb_free_idx >= NUM_TX_DESC)
215 priv->skb_free_idx = 0;
216 }
217 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
218 RAMIPS_FE_INT_ENABLE);
219 }
220
221 static int
222 ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
223 {
224 unsigned char *mac = (unsigned char*)priv;
225
226 if(netif_running(dev))
227 return -EBUSY;
228 memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
229 ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
230 ramips_fe_wr(RAMIPS_GDMA1_MAC_ADRL,
231 (mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5]);
232 return 0;
233 }
234
235 static void
236 ramips_eth_timeout(struct net_device *dev)
237 {
238 struct raeth_priv *priv = netdev_priv(dev);
239
240 tasklet_schedule(&priv->tx_housekeeping_tasklet);
241 }
242
243 static irqreturn_t
244 ramips_eth_irq(int irq, void *dev)
245 {
246 struct raeth_priv *priv = netdev_priv(dev);
247 unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
248
249 ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
250
251 if(fe_int & RAMIPS_RX_DLY_INT)
252 {
253 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~(RAMIPS_RX_DLY_INT),
254 RAMIPS_FE_INT_ENABLE);
255 tasklet_schedule(&priv->rx_tasklet);
256 }
257 if(fe_int & RAMIPS_TX_DLY_INT)
258 ramips_eth_tx_housekeeping((unsigned long)dev);
259 return IRQ_HANDLED;
260 }
261
262 static int
263 ramips_eth_open(struct net_device *dev)
264 {
265 struct raeth_priv *priv = netdev_priv(dev);
266
267 ramips_alloc_dma(dev);
268 ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
269 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
270 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
271 RAMIPS_PDMA_GLO_CFG);
272 ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
273 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
274 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
275 RAMIPS_FE_GLO_CFG);
276 request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED, dev->name, dev);
277 tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
278 (unsigned long)dev);
279 tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
280 ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
281 ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
282 ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
283 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
284 RAMIPS_GDMA1_FWD_CFG);
285 ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
286 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
287 RAMIPS_CDMA_CSG_CFG);
288 ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
289 ramips_fe_wr(1, RAMIPS_FE_RST_GL);
290 ramips_fe_wr(0, RAMIPS_FE_RST_GL);
291 netif_start_queue(dev);
292 return 0;
293 }
294
295 static int
296 ramips_eth_stop(struct net_device *dev)
297 {
298 struct raeth_priv *priv = netdev_priv(dev);
299
300 ramips_fe_wr(RAMIPS_PDMA_GLO_CFG, ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
301 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN));
302 free_irq(dev->irq, dev);
303 netif_stop_queue(dev);
304 tasklet_kill(&priv->tx_housekeeping_tasklet);
305 tasklet_kill(&priv->rx_tasklet);
306 pci_free_consistent(NULL, NUM_TX_DESC * sizeof(struct ramips_tx_dma),
307 priv->tx, priv->phy_tx);
308 pci_free_consistent(NULL, NUM_RX_DESC * sizeof(struct ramips_rx_dma),
309 priv->rx, priv->phy_rx);
310 printk(KERN_DEBUG "ramips_eth: stopped\n");
311 return 0;
312 }
313
314 static int __init
315 ramips_eth_probe(struct net_device *dev)
316 {
317 struct raeth_priv *priv = netdev_priv(dev);
318 struct sockaddr addr;
319
320 BUG_ON(!priv->plat->reset_fe);
321 priv->plat->reset_fe();
322 net_srandom(jiffies);
323 memcpy(addr.sa_data, priv->plat->mac, 6);
324 ramips_eth_set_mac_addr(dev, &addr);
325
326 ether_setup(dev);
327 dev->open = ramips_eth_open;
328 dev->stop = ramips_eth_stop;
329 dev->hard_start_xmit = ramips_eth_hard_start_xmit;
330 dev->set_mac_address = ramips_eth_set_mac_addr;
331 dev->mtu = MAX_RX_LENGTH;
332 dev->tx_timeout = ramips_eth_timeout;
333 dev->watchdog_timeo = TX_TIMEOUT;
334 return 0;
335 }
336
337 static int
338 ramips_eth_plat_probe(struct platform_device *plat)
339 {
340 struct raeth_priv *priv;
341 struct ramips_eth_platform_data *data = plat->dev.platform_data;
342 ramips_fe_base = ioremap_nocache(data->base_addr, PAGE_SIZE);
343 if(!ramips_fe_base)
344 return -ENOMEM;
345 ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
346 if(!ramips_dev)
347 return -ENOMEM;
348 strcpy(ramips_dev->name, "eth%d");
349 ramips_dev->irq = data->irq;
350 ramips_dev->addr_len = ETH_ALEN;
351 ramips_dev->base_addr = (unsigned long)ramips_fe_base;
352 ramips_dev->init = ramips_eth_probe;
353 priv = (struct raeth_priv*)netdev_priv(ramips_dev);
354 priv->plat = data;
355 if(register_netdev(ramips_dev))
356 {
357 printk(KERN_ERR "ramips_eth: error bringing up device\n");
358 return -ENXIO;
359 }
360 #ifdef CONFIG_RALINK_RT305X
361 rt305x_esw_init();
362 #endif
363 printk(KERN_DEBUG "ramips_eth: loaded\n");
364 return 0;
365 }
366
367 static int
368 ramips_eth_plat_remove(struct platform_device *plat)
369 {
370 unregister_netdev(ramips_dev);
371 free_netdev(ramips_dev);
372 printk(KERN_DEBUG "ramips_eth: unloaded\n");
373 return 0;
374 }
375
376 static struct platform_driver ramips_eth_driver = {
377 .probe = ramips_eth_plat_probe,
378 .remove = ramips_eth_plat_remove,
379 .driver = {
380 .name = "ramips_eth",
381 .owner = THIS_MODULE,
382 },
383 };
384
385 static int __init
386 ramips_eth_init(void)
387 {
388 int ret = platform_driver_register(&ramips_eth_driver);
389 if (ret)
390 printk(KERN_ERR
391 "ramips_eth: Error registering platfom driver!\n");
392 return ret;
393 }
394
395 static void __exit
396 ramips_eth_cleanup(void)
397 {
398 platform_driver_unregister(&ramips_eth_driver);
399 }
400
401 module_init(ramips_eth_init);
402 module_exit(ramips_eth_cleanup);
403
404 MODULE_LICENSE("GPL");
405 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
406 MODULE_DESCRIPTION("ethernet driver for ramips boards");