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/ethtool.h>
26 #include <linux/platform_device.h>
28 #include <ramips_eth_platform.h>
29 #include "ramips_eth.h"
31 #define TX_TIMEOUT (20 * HZ / 100)
32 #define MAX_RX_LENGTH 1600
34 #ifdef CONFIG_RALINK_RT305X
35 #include "ramips_esw.c"
37 static inline int rt305x_esw_init(void) { return 0; }
38 static inline void rt305x_esw_exit(void) { }
41 #define phys_to_bus(a) (a & 0x1FFFFFFF)
43 static struct net_device * ramips_dev;
44 static void __iomem *ramips_fe_base = 0;
47 ramips_fe_wr(u32 val, unsigned reg)
49 __raw_writel(val, ramips_fe_base + reg);
53 ramips_fe_rr(unsigned reg)
55 return __raw_readl(ramips_fe_base + reg);
59 ramips_fe_int_disable(u32 mask)
61 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~mask,
62 RAMIPS_FE_INT_ENABLE);
64 ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
68 ramips_fe_int_enable(u32 mask)
70 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | mask,
71 RAMIPS_FE_INT_ENABLE);
73 ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
77 ramips_hw_set_macaddr(unsigned char *mac)
79 ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
80 ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
81 RAMIPS_GDMA1_MAC_ADRL);
84 #ifdef CONFIG_RALINK_RT288X
86 ramips_setup_mdio_cfg(struct raeth_priv *re)
88 unsigned int mdio_cfg;
90 mdio_cfg = RAMIPS_MDIO_CFG_TX_CLK_SKEW_200 |
91 RAMIPS_MDIO_CFG_TX_CLK_SKEW_200 |
92 RAMIPS_MDIO_CFG_GP1_FRC_EN;
94 if (re->duplex == DUPLEX_FULL)
95 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_DUPLEX;
98 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_FC_TX;
101 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_FC_RX;
105 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_10;
108 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_100;
111 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_1000;
117 ramips_fe_wr(mdio_cfg, RAMIPS_MDIO_CFG);
120 static inline void ramips_setup_mdio_cfg(struct raeth_priv *re)
123 #endif /* CONFIG_RALINK_RT288X */
126 ramips_cleanup_dma(struct raeth_priv *re)
130 for (i = 0; i < NUM_RX_DESC; i++)
132 dma_unmap_single(&re->netdev->dev, re->rx_dma[i],
133 MAX_RX_LENGTH, DMA_FROM_DEVICE);
134 dev_kfree_skb_any(re->rx_skb[i]);
138 dma_free_coherent(&re->netdev->dev,
139 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
140 re->rx, re->rx_desc_dma);
143 dma_free_coherent(&re->netdev->dev,
144 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
145 re->tx, re->tx_desc_dma);
149 ramips_alloc_dma(struct raeth_priv *re)
154 re->skb_free_idx = 0;
157 re->tx = dma_alloc_coherent(&re->netdev->dev,
158 NUM_TX_DESC * sizeof(struct ramips_tx_dma),
159 &re->tx_desc_dma, GFP_ATOMIC);
163 memset(re->tx, 0, NUM_TX_DESC * sizeof(struct ramips_tx_dma));
164 for (i = 0; i < NUM_TX_DESC; i++) {
165 re->tx[i].txd2 = TX_DMA_LSO | TX_DMA_DONE;
166 re->tx[i].txd4 = TX_DMA_QN(3) | TX_DMA_PN(1);
170 re->rx = dma_alloc_coherent(&re->netdev->dev,
171 NUM_RX_DESC * sizeof(struct ramips_rx_dma),
172 &re->rx_desc_dma, GFP_ATOMIC);
176 memset(re->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
177 for (i = 0; i < NUM_RX_DESC; i++) {
179 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH +
185 skb_reserve(new_skb, NET_IP_ALIGN);
187 dma_addr = dma_map_single(&re->netdev->dev, new_skb->data,
188 MAX_RX_LENGTH, DMA_FROM_DEVICE);
189 re->rx_dma[i] = dma_addr;
190 re->rx[i].rxd1 = (unsigned int) re->rx_dma[i];
191 re->rx[i].rxd2 |= RX_DMA_LSO;
192 re->rx_skb[i] = new_skb;
198 ramips_cleanup_dma(re);
203 ramips_setup_dma(struct raeth_priv *re)
205 ramips_fe_wr(re->tx_desc_dma, RAMIPS_TX_BASE_PTR0);
206 ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
207 ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
208 ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
210 ramips_fe_wr(re->rx_desc_dma, RAMIPS_RX_BASE_PTR0);
211 ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
212 ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
213 ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
217 ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
219 struct raeth_priv *priv = netdev_priv(dev);
221 unsigned int tx_next;
222 dma_addr_t mapped_addr;
224 if (priv->plat->min_pkt_len) {
225 if (skb->len < priv->plat->min_pkt_len) {
226 if (skb_padto(skb, priv->plat->min_pkt_len)) {
228 "ramips_eth: skb_padto failed\n");
232 skb_put(skb, priv->plat->min_pkt_len - skb->len);
236 dev->trans_start = jiffies;
237 mapped_addr = dma_map_single(&priv->netdev->dev, skb->data, skb->len,
240 spin_lock(&priv->page_lock);
241 tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
242 tx_next = (tx + 1) % NUM_TX_DESC;
244 if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
245 !(priv->tx[tx].txd2 & TX_DMA_DONE) ||
246 !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
249 priv->tx[tx].txd1 = (unsigned int) mapped_addr;
250 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
251 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
252 dev->stats.tx_packets++;
253 dev->stats.tx_bytes += skb->len;
254 priv->tx_skb[tx] = skb;
256 ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
257 spin_unlock(&priv->page_lock);
261 spin_unlock(&priv->page_lock);
262 dev->stats.tx_dropped++;
268 ramips_eth_rx_hw(unsigned long ptr)
270 struct net_device *dev = (struct net_device *) ptr;
271 struct raeth_priv *priv = netdev_priv(dev);
276 struct sk_buff *rx_skb, *new_skb;
279 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
280 if (!(priv->rx[rx].rxd2 & RX_DMA_DONE))
284 rx_skb = priv->rx_skb[rx];
285 pktlen = RX_DMA_PLEN0(priv->rx[rx].rxd2);
287 new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + NET_IP_ALIGN);
288 /* Reuse the buffer on allocation failures */
292 dma_unmap_single(&priv->netdev->dev, priv->rx_dma[rx],
293 MAX_RX_LENGTH, DMA_FROM_DEVICE);
295 skb_put(rx_skb, pktlen);
297 rx_skb->protocol = eth_type_trans(rx_skb, dev);
298 rx_skb->ip_summed = CHECKSUM_NONE;
299 dev->stats.rx_packets++;
300 dev->stats.rx_bytes += pktlen;
303 priv->rx_skb[rx] = new_skb;
304 skb_reserve(new_skb, NET_IP_ALIGN);
306 dma_addr = dma_map_single(&priv->netdev->dev,
310 priv->rx_dma[rx] = dma_addr;
311 priv->rx[rx].rxd1 = (unsigned int) dma_addr;
313 dev->stats.rx_dropped++;
316 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
318 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
322 tasklet_schedule(&priv->rx_tasklet);
324 ramips_fe_int_enable(RAMIPS_RX_DLY_INT);
328 ramips_eth_tx_housekeeping(unsigned long ptr)
330 struct net_device *dev = (struct net_device*)ptr;
331 struct raeth_priv *priv = netdev_priv(dev);
333 spin_lock(&priv->page_lock);
334 while ((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
335 (priv->tx_skb[priv->skb_free_idx])) {
336 dev_kfree_skb_irq(priv->tx_skb[priv->skb_free_idx]);
337 priv->tx_skb[priv->skb_free_idx] = 0;
338 priv->skb_free_idx++;
339 if (priv->skb_free_idx >= NUM_TX_DESC)
340 priv->skb_free_idx = 0;
342 spin_unlock(&priv->page_lock);
344 ramips_fe_int_enable(RAMIPS_TX_DLY_INT);
348 ramips_eth_timeout(struct net_device *dev)
350 struct raeth_priv *priv = netdev_priv(dev);
352 tasklet_schedule(&priv->tx_housekeeping_tasklet);
356 ramips_eth_irq(int irq, void *dev)
358 struct raeth_priv *priv = netdev_priv(dev);
359 unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
361 ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
363 if (fe_int & RAMIPS_RX_DLY_INT) {
364 ramips_fe_int_disable(RAMIPS_RX_DLY_INT);
365 tasklet_schedule(&priv->rx_tasklet);
368 if (fe_int & RAMIPS_TX_DLY_INT) {
369 ramips_fe_int_disable(RAMIPS_TX_DLY_INT);
370 tasklet_schedule(&priv->tx_housekeeping_tasklet);
377 ramips_eth_open(struct net_device *dev)
379 struct raeth_priv *priv = netdev_priv(dev);
382 err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
387 err = ramips_alloc_dma(priv);
391 ramips_hw_set_macaddr(dev->dev_addr);
393 ramips_setup_dma(priv);
394 ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
395 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
396 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
397 RAMIPS_PDMA_GLO_CFG);
398 ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
399 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
400 ((priv->plat->sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
403 tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
405 tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
407 ramips_setup_mdio_cfg(priv);
409 ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
410 ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
411 ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
412 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
413 RAMIPS_GDMA1_FWD_CFG);
414 ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
415 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
416 RAMIPS_CDMA_CSG_CFG);
417 ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
418 ramips_fe_wr(1, RAMIPS_FE_RST_GL);
419 ramips_fe_wr(0, RAMIPS_FE_RST_GL);
421 netif_start_queue(dev);
425 free_irq(dev->irq, dev);
430 ramips_eth_stop(struct net_device *dev)
432 struct raeth_priv *priv = netdev_priv(dev);
434 ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
435 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
436 RAMIPS_PDMA_GLO_CFG);
438 /* disable all interrupts in the hw */
439 ramips_fe_wr(0, RAMIPS_FE_INT_ENABLE);
441 free_irq(dev->irq, dev);
442 netif_stop_queue(dev);
443 tasklet_kill(&priv->tx_housekeeping_tasklet);
444 tasklet_kill(&priv->rx_tasklet);
445 ramips_cleanup_dma(priv);
446 printk(KERN_DEBUG "ramips_eth: stopped\n");
451 ramips_eth_probe(struct net_device *dev)
453 struct raeth_priv *priv = netdev_priv(dev);
455 BUG_ON(!priv->plat->reset_fe);
456 priv->plat->reset_fe();
457 net_srandom(jiffies);
458 memcpy(dev->dev_addr, priv->plat->mac, ETH_ALEN);
462 dev->watchdog_timeo = TX_TIMEOUT;
463 spin_lock_init(&priv->page_lock);
468 static const struct net_device_ops ramips_eth_netdev_ops = {
469 .ndo_init = ramips_eth_probe,
470 .ndo_open = ramips_eth_open,
471 .ndo_stop = ramips_eth_stop,
472 .ndo_start_xmit = ramips_eth_hard_start_xmit,
473 .ndo_tx_timeout = ramips_eth_timeout,
474 .ndo_change_mtu = eth_change_mtu,
475 .ndo_set_mac_address = eth_mac_addr,
476 .ndo_validate_addr = eth_validate_addr,
480 ramips_eth_plat_probe(struct platform_device *plat)
482 struct raeth_priv *priv;
483 struct ramips_eth_platform_data *data = plat->dev.platform_data;
484 struct resource *res;
488 dev_err(&plat->dev, "no platform data specified\n");
492 res = platform_get_resource(plat, IORESOURCE_MEM, 0);
494 dev_err(&plat->dev, "no memory resource found\n");
498 ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
502 ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
504 dev_err(&plat->dev, "alloc_etherdev failed\n");
509 strcpy(ramips_dev->name, "eth%d");
510 ramips_dev->irq = platform_get_irq(plat, 0);
511 if (ramips_dev->irq < 0) {
512 dev_err(&plat->dev, "no IRQ resource found\n");
516 ramips_dev->addr_len = ETH_ALEN;
517 ramips_dev->base_addr = (unsigned long)ramips_fe_base;
518 ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
520 priv = netdev_priv(ramips_dev);
522 priv->netdev = ramips_dev;
523 priv->speed = data->speed;
524 priv->duplex = data->duplex;
525 priv->rx_fc = data->rx_fc;
526 priv->tx_fc = data->tx_fc;
529 err = register_netdev(ramips_dev);
531 dev_err(&plat->dev, "error bringing up device\n");
535 printk(KERN_DEBUG "ramips_eth: loaded\n");
541 iounmap(ramips_fe_base);
546 ramips_eth_plat_remove(struct platform_device *plat)
548 unregister_netdev(ramips_dev);
549 free_netdev(ramips_dev);
550 printk(KERN_DEBUG "ramips_eth: unloaded\n");
554 static struct platform_driver ramips_eth_driver = {
555 .probe = ramips_eth_plat_probe,
556 .remove = ramips_eth_plat_remove,
558 .name = "ramips_eth",
559 .owner = THIS_MODULE,
564 ramips_eth_init(void)
568 ret = rt305x_esw_init();
572 ret = platform_driver_register(&ramips_eth_driver);
575 "ramips_eth: Error registering platfom driver!\n");
587 ramips_eth_cleanup(void)
589 platform_driver_unregister(&ramips_eth_driver);
593 module_init(ramips_eth_init);
594 module_exit(ramips_eth_cleanup);
596 MODULE_LICENSE("GPL");
597 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
598 MODULE_DESCRIPTION("ethernet driver for ramips boards");