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_fe_int_disable(u32 mask)
57 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~mask,
58 RAMIPS_FE_INT_ENABLE);
60 ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
64 ramips_fe_int_enable(u32 mask)
66 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | mask,
67 RAMIPS_FE_INT_ENABLE);
69 ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
73 ramips_hw_set_macaddr(unsigned char *mac)
75 ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
76 ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
77 RAMIPS_GDMA1_MAC_ADRL);
81 ramips_cleanup_dma(struct raeth_priv *re)
85 for (i = 0; i < NUM_RX_DESC; i++)
87 dev_kfree_skb_any(re->rx_skb[i]);
90 dma_free_coherent(NULL,
91 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
95 dma_free_coherent(NULL,
96 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
101 ramips_alloc_dma(struct raeth_priv *re)
106 re->skb_free_idx = 0;
109 re->tx = dma_alloc_coherent(NULL,
110 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
111 &re->phy_tx, GFP_ATOMIC);
115 memset(re->tx, 0, NUM_TX_DESC * sizeof(struct ramips_tx_dma));
116 for (i = 0; i < NUM_TX_DESC; i++) {
117 re->tx[i].txd2 = TX_DMA_LSO | TX_DMA_DONE;
118 re->tx[i].txd4 = TX_DMA_QN(3) | TX_DMA_PN(1);
122 re->rx = dma_alloc_coherent(NULL,
123 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
124 &re->phy_rx, GFP_ATOMIC);
128 memset(re->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
129 for (i = 0; i < NUM_RX_DESC; i++) {
130 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
135 skb_reserve(new_skb, 2);
136 re->rx[i].rxd1 = dma_map_single(NULL,
140 re->rx[i].rxd2 |= RX_DMA_LSO;
141 re->rx_skb[i] = new_skb;
147 ramips_cleanup_dma(re);
152 ramips_setup_dma(struct raeth_priv *re)
154 ramips_fe_wr(phys_to_bus(re->phy_tx), RAMIPS_TX_BASE_PTR0);
155 ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
156 ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
157 ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
159 ramips_fe_wr(phys_to_bus(re->phy_rx), RAMIPS_RX_BASE_PTR0);
160 ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
161 ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
162 ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
166 ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
168 struct raeth_priv *priv = netdev_priv(dev);
170 unsigned int tx_next;
171 unsigned int mapped_addr;
174 if (priv->plat->min_pkt_len) {
175 if (skb->len < priv->plat->min_pkt_len) {
176 if (skb_padto(skb, priv->plat->min_pkt_len)) {
178 "ramips_eth: skb_padto failed\n");
182 skb_put(skb, priv->plat->min_pkt_len - skb->len);
186 dev->trans_start = jiffies;
187 mapped_addr = (unsigned int) dma_map_single(NULL, skb->data, skb->len,
189 dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
190 spin_lock_irqsave(&priv->page_lock, flags);
191 tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
192 tx_next = (tx + 1) % NUM_TX_DESC;
194 if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
195 !(priv->tx[tx].txd2 & TX_DMA_DONE) ||
196 !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
199 priv->tx[tx].txd1 = mapped_addr;
200 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
201 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
202 dev->stats.tx_packets++;
203 dev->stats.tx_bytes += skb->len;
204 priv->tx_skb[tx] = skb;
206 ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
207 spin_unlock_irqrestore(&priv->page_lock, flags);
211 spin_unlock_irqrestore(&priv->page_lock, flags);
212 dev->stats.tx_dropped++;
218 ramips_eth_rx_hw(unsigned long ptr)
220 struct net_device *dev = (struct net_device *) ptr;
221 struct raeth_priv *priv = netdev_priv(dev);
226 struct sk_buff *rx_skb, *new_skb;
228 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
229 if (!(priv->rx[rx].rxd2 & RX_DMA_DONE))
233 rx_skb = priv->rx_skb[rx];
234 skb_put(rx_skb, RX_DMA_PLEN0(priv->rx[rx].rxd2));
236 rx_skb->protocol = eth_type_trans(rx_skb, dev);
237 rx_skb->ip_summed = CHECKSUM_NONE;
238 dev->stats.rx_packets++;
239 dev->stats.rx_bytes += rx_skb->len;
242 new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + 2);
243 priv->rx_skb[rx] = new_skb;
245 skb_reserve(new_skb, 2);
246 priv->rx[rx].rxd1 = dma_map_single(NULL,
250 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
252 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
256 tasklet_schedule(&priv->rx_tasklet);
258 ramips_fe_int_enable(RAMIPS_RX_DLY_INT);
262 ramips_eth_tx_housekeeping(unsigned long ptr)
264 struct net_device *dev = (struct net_device*)ptr;
265 struct raeth_priv *priv = netdev_priv(dev);
267 while ((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
268 (priv->tx_skb[priv->skb_free_idx])) {
269 dev_kfree_skb_irq(priv->tx_skb[priv->skb_free_idx]);
270 priv->tx_skb[priv->skb_free_idx] = 0;
271 priv->skb_free_idx++;
272 if (priv->skb_free_idx >= NUM_TX_DESC)
273 priv->skb_free_idx = 0;
276 ramips_fe_int_enable(RAMIPS_TX_DLY_INT);
280 ramips_eth_timeout(struct net_device *dev)
282 struct raeth_priv *priv = netdev_priv(dev);
284 tasklet_schedule(&priv->tx_housekeeping_tasklet);
288 ramips_eth_irq(int irq, void *dev)
290 struct raeth_priv *priv = netdev_priv(dev);
291 unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
293 ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
295 if (fe_int & RAMIPS_RX_DLY_INT) {
296 ramips_fe_int_disable(RAMIPS_RX_DLY_INT);
297 tasklet_schedule(&priv->rx_tasklet);
300 if (fe_int & RAMIPS_TX_DLY_INT)
301 ramips_eth_tx_housekeeping((unsigned long)dev);
307 ramips_eth_open(struct net_device *dev)
309 struct raeth_priv *priv = netdev_priv(dev);
312 err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
317 err = ramips_alloc_dma(priv);
321 ramips_hw_set_macaddr(dev->dev_addr);
323 ramips_setup_dma(priv);
324 ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
325 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
326 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
327 RAMIPS_PDMA_GLO_CFG);
328 ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
329 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
330 ((priv->plat->sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
333 tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
335 tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
337 ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
338 ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
339 ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
340 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
341 RAMIPS_GDMA1_FWD_CFG);
342 ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
343 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
344 RAMIPS_CDMA_CSG_CFG);
345 ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
346 ramips_fe_wr(1, RAMIPS_FE_RST_GL);
347 ramips_fe_wr(0, RAMIPS_FE_RST_GL);
349 netif_start_queue(dev);
353 free_irq(dev->irq, dev);
358 ramips_eth_stop(struct net_device *dev)
360 struct raeth_priv *priv = netdev_priv(dev);
362 ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
363 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
364 RAMIPS_PDMA_GLO_CFG);
365 free_irq(dev->irq, dev);
366 netif_stop_queue(dev);
367 tasklet_kill(&priv->tx_housekeeping_tasklet);
368 tasklet_kill(&priv->rx_tasklet);
369 ramips_cleanup_dma(priv);
370 printk(KERN_DEBUG "ramips_eth: stopped\n");
375 ramips_eth_probe(struct net_device *dev)
377 struct raeth_priv *priv = netdev_priv(dev);
379 BUG_ON(!priv->plat->reset_fe);
380 priv->plat->reset_fe();
381 net_srandom(jiffies);
382 memcpy(dev->dev_addr, priv->plat->mac, ETH_ALEN);
386 dev->watchdog_timeo = TX_TIMEOUT;
387 spin_lock_init(&priv->page_lock);
392 static const struct net_device_ops ramips_eth_netdev_ops = {
393 .ndo_init = ramips_eth_probe,
394 .ndo_open = ramips_eth_open,
395 .ndo_stop = ramips_eth_stop,
396 .ndo_start_xmit = ramips_eth_hard_start_xmit,
397 .ndo_tx_timeout = ramips_eth_timeout,
398 .ndo_change_mtu = eth_change_mtu,
399 .ndo_set_mac_address = eth_mac_addr,
400 .ndo_validate_addr = eth_validate_addr,
404 ramips_eth_plat_probe(struct platform_device *plat)
406 struct raeth_priv *priv;
407 struct ramips_eth_platform_data *data = plat->dev.platform_data;
408 struct resource *res;
412 dev_err(&plat->dev, "no platform data specified\n");
416 res = platform_get_resource(plat, IORESOURCE_MEM, 0);
418 dev_err(&plat->dev, "no memory resource found\n");
422 ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
426 ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
428 dev_err(&plat->dev, "alloc_etherdev failed\n");
433 strcpy(ramips_dev->name, "eth%d");
434 ramips_dev->irq = platform_get_irq(plat, 0);
435 if (ramips_dev->irq < 0) {
436 dev_err(&plat->dev, "no IRQ resource found\n");
440 ramips_dev->addr_len = ETH_ALEN;
441 ramips_dev->base_addr = (unsigned long)ramips_fe_base;
442 ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
444 priv = netdev_priv(ramips_dev);
447 err = register_netdev(ramips_dev);
449 dev_err(&plat->dev, "error bringing up device\n");
453 #ifdef CONFIG_RALINK_RT305X
456 printk(KERN_DEBUG "ramips_eth: loaded\n");
462 iounmap(ramips_fe_base);
467 ramips_eth_plat_remove(struct platform_device *plat)
469 unregister_netdev(ramips_dev);
470 free_netdev(ramips_dev);
471 printk(KERN_DEBUG "ramips_eth: unloaded\n");
475 static struct platform_driver ramips_eth_driver = {
476 .probe = ramips_eth_plat_probe,
477 .remove = ramips_eth_plat_remove,
479 .name = "ramips_eth",
480 .owner = THIS_MODULE,
485 ramips_eth_init(void)
487 int ret = platform_driver_register(&ramips_eth_driver);
490 "ramips_eth: Error registering platfom driver!\n");
495 ramips_eth_cleanup(void)
497 platform_driver_unregister(&ramips_eth_driver);
500 module_init(ramips_eth_init);
501 module_exit(ramips_eth_cleanup);
503 MODULE_LICENSE("GPL");
504 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
505 MODULE_DESCRIPTION("ethernet driver for ramips boards");