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
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.
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.
15 * Copyright (C) 2009 John Crispin <blogic@openwrt.org>
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>
27 #include <ramips_eth_platform.h>
28 #include "ramips_eth.h"
30 #define TX_TIMEOUT (20 * HZ / 100)
31 #define MAX_RX_LENGTH 1600
33 #ifdef CONFIG_RALINK_RT305X
34 #include "ramips_esw.c"
37 #define phys_to_bus(a) (a & 0x1FFFFFFF)
39 static struct net_device * ramips_dev;
40 static void __iomem *ramips_fe_base = 0;
43 ramips_fe_wr(u32 val, unsigned reg)
45 __raw_writel(val, ramips_fe_base + reg);
49 ramips_fe_rr(unsigned reg)
51 return __raw_readl(ramips_fe_base + reg);
55 ramips_cleanup_dma(struct raeth_priv *re)
59 for (i = 0; i < NUM_RX_DESC; i++)
61 dev_kfree_skb_any(re->rx_skb[i]);
64 dma_free_coherent(NULL,
65 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
69 dma_free_coherent(NULL,
70 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
75 ramips_alloc_dma(struct raeth_priv *re)
83 re->tx = dma_alloc_coherent(NULL,
84 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
85 &re->phy_tx, GFP_ATOMIC);
89 memset(re->tx, 0, NUM_TX_DESC * sizeof(struct ramips_tx_dma));
90 for (i = 0; i < NUM_TX_DESC; i++) {
91 re->tx[i].txd2 = TX_DMA_LSO | TX_DMA_DONE;
92 re->tx[i].txd4 = TX_DMA_QN(3) | TX_DMA_PN(1);
96 re->rx = dma_alloc_coherent(NULL,
97 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
98 &re->phy_rx, GFP_ATOMIC);
102 memset(re->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
103 for (i = 0; i < NUM_RX_DESC; i++) {
104 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
109 skb_reserve(new_skb, 2);
110 re->rx[i].rxd1 = dma_map_single(NULL,
114 re->rx[i].rxd2 |= RX_DMA_LSO;
115 re->rx_skb[i] = new_skb;
121 ramips_cleanup_dma(re);
126 ramips_setup_dma(struct raeth_priv *re)
128 ramips_fe_wr(phys_to_bus(re->phy_tx), RAMIPS_TX_BASE_PTR0);
129 ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
130 ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
131 ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
133 ramips_fe_wr(phys_to_bus(re->phy_rx), RAMIPS_RX_BASE_PTR0);
134 ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
135 ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
136 ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
140 ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
142 struct raeth_priv *priv = netdev_priv(dev);
144 unsigned int tx_next;
145 unsigned int mapped_addr;
148 if (priv->plat->min_pkt_len) {
149 if (skb->len < priv->plat->min_pkt_len) {
150 if (skb_padto(skb, priv->plat->min_pkt_len)) {
152 "ramips_eth: skb_padto failed\n");
156 skb_put(skb, priv->plat->min_pkt_len - skb->len);
160 dev->trans_start = jiffies;
161 mapped_addr = (unsigned int) dma_map_single(NULL, skb->data, skb->len,
163 dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
164 spin_lock_irqsave(&priv->page_lock, flags);
165 tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
166 if (tx == NUM_TX_DESC - 1)
171 if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
172 !(priv->tx[tx].txd2 & TX_DMA_DONE) ||
173 !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
176 priv->tx[tx].txd1 = mapped_addr;
177 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
178 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
179 dev->stats.tx_packets++;
180 dev->stats.tx_bytes += skb->len;
181 priv->tx_skb[tx] = skb;
183 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
184 spin_unlock_irqrestore(&priv->page_lock, flags);
188 spin_unlock_irqrestore(&priv->page_lock, flags);
189 dev->stats.tx_dropped++;
195 ramips_eth_rx_hw(unsigned long ptr)
197 struct net_device *dev = (struct net_device *) ptr;
198 struct raeth_priv *priv = netdev_priv(dev);
203 struct sk_buff *rx_skb, *new_skb;
205 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
206 if (!(priv->rx[rx].rxd2 & RX_DMA_DONE))
210 rx_skb = priv->rx_skb[rx];
211 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
213 rx_skb->protocol = eth_type_trans(rx_skb, dev);
214 rx_skb->ip_summed = CHECKSUM_NONE;
215 dev->stats.rx_packets++;
216 dev->stats.rx_bytes += rx_skb->len;
219 new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + 2);
220 priv->rx_skb[rx] = new_skb;
222 skb_reserve(new_skb, 2);
223 priv->rx[rx].rxd1 = dma_map_single(NULL,
227 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
229 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
233 tasklet_schedule(&priv->rx_tasklet);
235 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
236 RAMIPS_FE_INT_ENABLE);
240 ramips_eth_tx_housekeeping(unsigned long ptr)
242 struct net_device *dev = (struct net_device*)ptr;
243 struct raeth_priv *priv = netdev_priv(dev);
245 while ((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
246 (priv->tx_skb[priv->skb_free_idx])) {
247 dev_kfree_skb_irq((struct sk_buff *) priv->tx_skb[priv->skb_free_idx]);
248 priv->tx_skb[priv->skb_free_idx] = 0;
249 priv->skb_free_idx++;
250 if (priv->skb_free_idx >= NUM_TX_DESC)
251 priv->skb_free_idx = 0;
254 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
255 RAMIPS_FE_INT_ENABLE);
259 ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
261 unsigned char *mac = (unsigned char *) priv;
263 if (netif_running(dev))
266 memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
267 ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
268 ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
269 RAMIPS_GDMA1_MAC_ADRL);
274 ramips_eth_timeout(struct net_device *dev)
276 struct raeth_priv *priv = netdev_priv(dev);
278 tasklet_schedule(&priv->tx_housekeeping_tasklet);
282 ramips_eth_irq(int irq, void *dev)
284 struct raeth_priv *priv = netdev_priv(dev);
285 unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
287 ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
289 if (fe_int & RAMIPS_RX_DLY_INT) {
290 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~(RAMIPS_RX_DLY_INT),
291 RAMIPS_FE_INT_ENABLE);
292 tasklet_schedule(&priv->rx_tasklet);
295 if (fe_int & RAMIPS_TX_DLY_INT)
296 ramips_eth_tx_housekeeping((unsigned long)dev);
302 ramips_eth_open(struct net_device *dev)
304 struct raeth_priv *priv = netdev_priv(dev);
307 err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
312 err = ramips_alloc_dma(priv);
316 ramips_setup_dma(priv);
317 ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
318 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
319 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
320 RAMIPS_PDMA_GLO_CFG);
321 ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
322 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
323 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
326 tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
328 tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
330 ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
331 ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
332 ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
333 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
334 RAMIPS_GDMA1_FWD_CFG);
335 ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
336 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
337 RAMIPS_CDMA_CSG_CFG);
338 ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
339 ramips_fe_wr(1, RAMIPS_FE_RST_GL);
340 ramips_fe_wr(0, RAMIPS_FE_RST_GL);
342 netif_start_queue(dev);
346 free_irq(dev->irq, dev);
351 ramips_eth_stop(struct net_device *dev)
353 struct raeth_priv *priv = netdev_priv(dev);
355 ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
356 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
357 RAMIPS_PDMA_GLO_CFG);
358 free_irq(dev->irq, dev);
359 netif_stop_queue(dev);
360 tasklet_kill(&priv->tx_housekeeping_tasklet);
361 tasklet_kill(&priv->rx_tasklet);
362 ramips_cleanup_dma(priv);
363 printk(KERN_DEBUG "ramips_eth: stopped\n");
368 ramips_eth_probe(struct net_device *dev)
370 struct raeth_priv *priv = netdev_priv(dev);
371 struct sockaddr addr;
373 BUG_ON(!priv->plat->reset_fe);
374 priv->plat->reset_fe();
375 net_srandom(jiffies);
376 memcpy(addr.sa_data, priv->plat->mac, 6);
377 ramips_eth_set_mac_addr(dev, &addr);
381 dev->watchdog_timeo = TX_TIMEOUT;
382 spin_lock_init(&priv->page_lock);
387 static const struct net_device_ops ramips_eth_netdev_ops = {
388 .ndo_init = ramips_eth_probe,
389 .ndo_open = ramips_eth_open,
390 .ndo_stop = ramips_eth_stop,
391 .ndo_start_xmit = ramips_eth_hard_start_xmit,
392 .ndo_tx_timeout = ramips_eth_timeout,
393 .ndo_change_mtu = eth_change_mtu,
394 .ndo_set_mac_address = ramips_eth_set_mac_addr,
395 .ndo_validate_addr = eth_validate_addr,
399 ramips_eth_plat_probe(struct platform_device *plat)
401 struct raeth_priv *priv;
402 struct ramips_eth_platform_data *data = plat->dev.platform_data;
403 struct resource *res;
407 dev_err(&plat->dev, "no platform data specified\n");
411 res = platform_get_resource(plat, IORESOURCE_MEM, 0);
413 dev_err(&plat->dev, "no memory resource found\n");
417 ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
421 ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
423 dev_err(&plat->dev, "alloc_etherdev failed\n");
428 strcpy(ramips_dev->name, "eth%d");
429 ramips_dev->irq = platform_get_irq(plat, 0);
430 if (ramips_dev->irq < 0) {
431 dev_err(&plat->dev, "no IRQ resource found\n");
435 ramips_dev->addr_len = ETH_ALEN;
436 ramips_dev->base_addr = (unsigned long)ramips_fe_base;
437 ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
439 priv = netdev_priv(ramips_dev);
442 err = register_netdev(ramips_dev);
444 dev_err(&plat->dev, "error bringing up device\n");
448 #ifdef CONFIG_RALINK_RT305X
451 printk(KERN_DEBUG "ramips_eth: loaded\n");
457 iounmap(ramips_fe_base);
462 ramips_eth_plat_remove(struct platform_device *plat)
464 unregister_netdev(ramips_dev);
465 free_netdev(ramips_dev);
466 printk(KERN_DEBUG "ramips_eth: unloaded\n");
470 static struct platform_driver ramips_eth_driver = {
471 .probe = ramips_eth_plat_probe,
472 .remove = ramips_eth_plat_remove,
474 .name = "ramips_eth",
475 .owner = THIS_MODULE,
480 ramips_eth_init(void)
482 int ret = platform_driver_register(&ramips_eth_driver);
485 "ramips_eth: Error registering platfom driver!\n");
490 ramips_eth_cleanup(void)
492 platform_driver_unregister(&ramips_eth_driver);
495 module_init(ramips_eth_init);
496 module_exit(ramips_eth_cleanup);
498 MODULE_LICENSE("GPL");
499 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
500 MODULE_DESCRIPTION("ethernet driver for ramips boards");