Root/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; version 2 of the License
5 *
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.
10 *
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.
14 *
15 * Copyright (C) 2009 John Crispin <blogic@openwrt.org>
16 */
17
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>
27
28#include <ramips_eth_platform.h>
29#include "ramips_eth.h"
30
31#define TX_TIMEOUT (20 * HZ / 100)
32#define MAX_RX_LENGTH 1600
33
34#ifdef CONFIG_RALINK_RT305X
35#include "ramips_esw.c"
36#else
37static inline int rt305x_esw_init(void) { return 0; }
38static inline void rt305x_esw_exit(void) { }
39#endif
40
41#define phys_to_bus(a) (a & 0x1FFFFFFF)
42
43static struct net_device * ramips_dev;
44static void __iomem *ramips_fe_base = 0;
45
46static inline void
47ramips_fe_wr(u32 val, unsigned reg)
48{
49    __raw_writel(val, ramips_fe_base + reg);
50}
51
52static inline u32
53ramips_fe_rr(unsigned reg)
54{
55    return __raw_readl(ramips_fe_base + reg);
56}
57
58static inline void
59ramips_fe_int_disable(u32 mask)
60{
61    ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~mask,
62             RAMIPS_FE_INT_ENABLE);
63    /* flush write */
64    ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
65}
66
67static inline void
68ramips_fe_int_enable(u32 mask)
69{
70    ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | mask,
71             RAMIPS_FE_INT_ENABLE);
72    /* flush write */
73    ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
74}
75
76static inline void
77ramips_hw_set_macaddr(unsigned char *mac)
78{
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);
82}
83
84#ifdef CONFIG_RALINK_RT288X
85static void
86ramips_setup_mdio_cfg(struct raeth_priv *re)
87{
88    unsigned int mdio_cfg;
89
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;
93
94    if (re->duplex == DUPLEX_FULL)
95        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_DUPLEX;
96
97    if (re->tx_fc)
98        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_FC_TX;
99
100    if (re->rx_fc)
101        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_FC_RX;
102
103    switch (re->speed) {
104    case SPEED_10:
105        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_10;
106        break;
107    case SPEED_100:
108        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_100;
109        break;
110    case SPEED_1000:
111        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_1000;
112        break;
113    default:
114        BUG();
115    }
116
117    ramips_fe_wr(mdio_cfg, RAMIPS_MDIO_CFG);
118}
119#else
120static inline void ramips_setup_mdio_cfg(struct raeth_priv *re)
121{
122}
123#endif /* CONFIG_RALINK_RT288X */
124
125static void
126ramips_cleanup_dma(struct raeth_priv *re)
127{
128    int i;
129
130    for (i = 0; i < NUM_RX_DESC; i++)
131        if (re->rx_skb[i])
132            dev_kfree_skb_any(re->rx_skb[i]);
133
134    if (re->rx)
135        dma_free_coherent(NULL,
136                  NUM_RX_DESC * sizeof(struct ramips_rx_dma),
137                  re->rx, re->phy_rx);
138
139    if (re->tx)
140        dma_free_coherent(NULL,
141                  NUM_TX_DESC * sizeof(struct ramips_tx_dma),
142                  re->tx, re->phy_tx);
143}
144
145static int
146ramips_alloc_dma(struct raeth_priv *re)
147{
148    int err = -ENOMEM;
149    int i;
150
151    re->skb_free_idx = 0;
152
153    /* setup tx ring */
154    re->tx = dma_alloc_coherent(NULL,
155                    NUM_TX_DESC * sizeof(struct ramips_tx_dma),
156                    &re->phy_tx, GFP_ATOMIC);
157    if (!re->tx)
158        goto err_cleanup;
159
160    memset(re->tx, 0, NUM_TX_DESC * sizeof(struct ramips_tx_dma));
161    for (i = 0; i < NUM_TX_DESC; i++) {
162        re->tx[i].txd2 = TX_DMA_LSO | TX_DMA_DONE;
163        re->tx[i].txd4 = TX_DMA_QN(3) | TX_DMA_PN(1);
164    }
165
166    /* setup rx ring */
167    re->rx = dma_alloc_coherent(NULL,
168                    NUM_RX_DESC * sizeof(struct ramips_rx_dma),
169                    &re->phy_rx, GFP_ATOMIC);
170    if (!re->rx)
171        goto err_cleanup;
172
173    memset(re->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
174    for (i = 0; i < NUM_RX_DESC; i++) {
175        struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH +
176                            NET_IP_ALIGN);
177
178        if (!new_skb)
179            goto err_cleanup;
180
181        skb_reserve(new_skb, NET_IP_ALIGN);
182        re->rx[i].rxd1 = dma_map_single(NULL,
183                        new_skb->data,
184                        MAX_RX_LENGTH,
185                        DMA_FROM_DEVICE);
186        re->rx[i].rxd2 |= RX_DMA_LSO;
187        re->rx_skb[i] = new_skb;
188    }
189
190    return 0;
191
192 err_cleanup:
193    ramips_cleanup_dma(re);
194    return err;
195}
196
197static void
198ramips_setup_dma(struct raeth_priv *re)
199{
200    ramips_fe_wr(phys_to_bus(re->phy_tx), RAMIPS_TX_BASE_PTR0);
201    ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
202    ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
203    ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
204
205    ramips_fe_wr(phys_to_bus(re->phy_rx), RAMIPS_RX_BASE_PTR0);
206    ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
207    ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
208    ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
209}
210
211static int
212ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
213{
214    struct raeth_priv *priv = netdev_priv(dev);
215    unsigned long tx;
216    unsigned int tx_next;
217    unsigned int mapped_addr;
218    unsigned long flags;
219
220    if (priv->plat->min_pkt_len) {
221        if (skb->len < priv->plat->min_pkt_len) {
222            if (skb_padto(skb, priv->plat->min_pkt_len)) {
223                printk(KERN_ERR
224                       "ramips_eth: skb_padto failed\n");
225                kfree_skb(skb);
226                return 0;
227            }
228            skb_put(skb, priv->plat->min_pkt_len - skb->len);
229        }
230    }
231
232    dev->trans_start = jiffies;
233    mapped_addr = (unsigned int) dma_map_single(NULL, skb->data, skb->len,
234                            DMA_TO_DEVICE);
235    dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
236    spin_lock_irqsave(&priv->page_lock, flags);
237    tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
238    tx_next = (tx + 1) % NUM_TX_DESC;
239
240    if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
241        !(priv->tx[tx].txd2 & TX_DMA_DONE) ||
242        !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
243        goto out;
244
245    priv->tx[tx].txd1 = mapped_addr;
246    priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
247    priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
248    dev->stats.tx_packets++;
249    dev->stats.tx_bytes += skb->len;
250    priv->tx_skb[tx] = skb;
251    wmb();
252    ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
253    spin_unlock_irqrestore(&priv->page_lock, flags);
254    return NETDEV_TX_OK;
255
256 out:
257    spin_unlock_irqrestore(&priv->page_lock, flags);
258    dev->stats.tx_dropped++;
259    kfree_skb(skb);
260    return NETDEV_TX_OK;
261}
262
263static void
264ramips_eth_rx_hw(unsigned long ptr)
265{
266    struct net_device *dev = (struct net_device *) ptr;
267    struct raeth_priv *priv = netdev_priv(dev);
268    int rx;
269    int max_rx = 16;
270
271    while (max_rx) {
272        struct sk_buff *rx_skb, *new_skb;
273
274        rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
275        if (!(priv->rx[rx].rxd2 & RX_DMA_DONE))
276            break;
277        max_rx--;
278
279        new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + NET_IP_ALIGN);
280        /* Reuse the buffer on allocation failures */
281        if (new_skb) {
282            rx_skb = priv->rx_skb[rx];
283            skb_put(rx_skb, RX_DMA_PLEN0(priv->rx[rx].rxd2));
284            rx_skb->dev = dev;
285            rx_skb->protocol = eth_type_trans(rx_skb, dev);
286            rx_skb->ip_summed = CHECKSUM_NONE;
287            dev->stats.rx_packets++;
288            dev->stats.rx_bytes += rx_skb->len;
289            netif_rx(rx_skb);
290
291            priv->rx_skb[rx] = new_skb;
292            skb_reserve(new_skb, NET_IP_ALIGN);
293            priv->rx[rx].rxd1 = dma_map_single(NULL,
294                               new_skb->data,
295                               MAX_RX_LENGTH,
296                               DMA_FROM_DEVICE);
297        }
298
299        priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
300        wmb();
301        ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
302    }
303
304    if (max_rx == 0)
305        tasklet_schedule(&priv->rx_tasklet);
306    else
307        ramips_fe_int_enable(RAMIPS_RX_DLY_INT);
308}
309
310static void
311ramips_eth_tx_housekeeping(unsigned long ptr)
312{
313    struct net_device *dev = (struct net_device*)ptr;
314    struct raeth_priv *priv = netdev_priv(dev);
315
316    while ((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
317           (priv->tx_skb[priv->skb_free_idx])) {
318        dev_kfree_skb_irq(priv->tx_skb[priv->skb_free_idx]);
319        priv->tx_skb[priv->skb_free_idx] = 0;
320        priv->skb_free_idx++;
321        if (priv->skb_free_idx >= NUM_TX_DESC)
322            priv->skb_free_idx = 0;
323    }
324
325    ramips_fe_int_enable(RAMIPS_TX_DLY_INT);
326}
327
328static void
329ramips_eth_timeout(struct net_device *dev)
330{
331    struct raeth_priv *priv = netdev_priv(dev);
332
333    tasklet_schedule(&priv->tx_housekeeping_tasklet);
334}
335
336static irqreturn_t
337ramips_eth_irq(int irq, void *dev)
338{
339    struct raeth_priv *priv = netdev_priv(dev);
340    unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
341
342    ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
343
344    if (fe_int & RAMIPS_RX_DLY_INT) {
345        ramips_fe_int_disable(RAMIPS_RX_DLY_INT);
346        tasklet_schedule(&priv->rx_tasklet);
347    }
348
349    if (fe_int & RAMIPS_TX_DLY_INT)
350        ramips_eth_tx_housekeeping((unsigned long)dev);
351
352    return IRQ_HANDLED;
353}
354
355static int
356ramips_eth_open(struct net_device *dev)
357{
358    struct raeth_priv *priv = netdev_priv(dev);
359    int err;
360
361    err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
362              dev->name, dev);
363    if (err)
364        return err;
365
366    err = ramips_alloc_dma(priv);
367    if (err)
368        goto err_free_irq;
369
370    ramips_hw_set_macaddr(dev->dev_addr);
371
372    ramips_setup_dma(priv);
373    ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
374        (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
375        RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
376        RAMIPS_PDMA_GLO_CFG);
377    ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
378        ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
379        ((priv->plat->sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
380        RAMIPS_FE_GLO_CFG);
381
382    tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
383             (unsigned long)dev);
384    tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
385
386    ramips_setup_mdio_cfg(priv);
387
388    ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
389    ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
390    ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
391        ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
392        RAMIPS_GDMA1_FWD_CFG);
393    ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
394        ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
395        RAMIPS_CDMA_CSG_CFG);
396    ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
397    ramips_fe_wr(1, RAMIPS_FE_RST_GL);
398    ramips_fe_wr(0, RAMIPS_FE_RST_GL);
399
400    netif_start_queue(dev);
401    return 0;
402
403 err_free_irq:
404    free_irq(dev->irq, dev);
405    return err;
406}
407
408static int
409ramips_eth_stop(struct net_device *dev)
410{
411    struct raeth_priv *priv = netdev_priv(dev);
412
413    ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
414             ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
415             RAMIPS_PDMA_GLO_CFG);
416
417    /* disable all interrupts in the hw */
418    ramips_fe_wr(0, RAMIPS_FE_INT_ENABLE);
419
420    free_irq(dev->irq, dev);
421    netif_stop_queue(dev);
422    tasklet_kill(&priv->tx_housekeeping_tasklet);
423    tasklet_kill(&priv->rx_tasklet);
424    ramips_cleanup_dma(priv);
425    printk(KERN_DEBUG "ramips_eth: stopped\n");
426    return 0;
427}
428
429static int __init
430ramips_eth_probe(struct net_device *dev)
431{
432    struct raeth_priv *priv = netdev_priv(dev);
433
434    BUG_ON(!priv->plat->reset_fe);
435    priv->plat->reset_fe();
436    net_srandom(jiffies);
437    memcpy(dev->dev_addr, priv->plat->mac, ETH_ALEN);
438
439    ether_setup(dev);
440    dev->mtu = 1500;
441    dev->watchdog_timeo = TX_TIMEOUT;
442    spin_lock_init(&priv->page_lock);
443
444    return 0;
445}
446
447static const struct net_device_ops ramips_eth_netdev_ops = {
448    .ndo_init = ramips_eth_probe,
449    .ndo_open = ramips_eth_open,
450    .ndo_stop = ramips_eth_stop,
451    .ndo_start_xmit = ramips_eth_hard_start_xmit,
452    .ndo_tx_timeout = ramips_eth_timeout,
453    .ndo_change_mtu = eth_change_mtu,
454    .ndo_set_mac_address = eth_mac_addr,
455    .ndo_validate_addr = eth_validate_addr,
456};
457
458static int
459ramips_eth_plat_probe(struct platform_device *plat)
460{
461    struct raeth_priv *priv;
462    struct ramips_eth_platform_data *data = plat->dev.platform_data;
463    struct resource *res;
464    int err;
465
466    if (!data) {
467        dev_err(&plat->dev, "no platform data specified\n");
468        return -EINVAL;
469    }
470
471    res = platform_get_resource(plat, IORESOURCE_MEM, 0);
472    if (!res) {
473        dev_err(&plat->dev, "no memory resource found\n");
474        return -ENXIO;
475    }
476
477    ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
478    if (!ramips_fe_base)
479        return -ENOMEM;
480
481    ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
482    if (!ramips_dev) {
483        dev_err(&plat->dev, "alloc_etherdev failed\n");
484        err = -ENOMEM;
485        goto err_unmap;
486    }
487
488    strcpy(ramips_dev->name, "eth%d");
489    ramips_dev->irq = platform_get_irq(plat, 0);
490    if (ramips_dev->irq < 0) {
491        dev_err(&plat->dev, "no IRQ resource found\n");
492        err = -ENXIO;
493        goto err_free_dev;
494    }
495    ramips_dev->addr_len = ETH_ALEN;
496    ramips_dev->base_addr = (unsigned long)ramips_fe_base;
497    ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
498
499    priv = netdev_priv(ramips_dev);
500
501    priv->speed = data->speed;
502    priv->duplex = data->duplex;
503    priv->rx_fc = data->rx_fc;
504    priv->tx_fc = data->tx_fc;
505    priv->plat = data;
506
507    err = register_netdev(ramips_dev);
508    if (err) {
509        dev_err(&plat->dev, "error bringing up device\n");
510        goto err_free_dev;
511    }
512
513    printk(KERN_DEBUG "ramips_eth: loaded\n");
514    return 0;
515
516 err_free_dev:
517    kfree(ramips_dev);
518 err_unmap:
519    iounmap(ramips_fe_base);
520    return err;
521}
522
523static int
524ramips_eth_plat_remove(struct platform_device *plat)
525{
526    unregister_netdev(ramips_dev);
527    free_netdev(ramips_dev);
528    printk(KERN_DEBUG "ramips_eth: unloaded\n");
529    return 0;
530}
531
532static struct platform_driver ramips_eth_driver = {
533    .probe = ramips_eth_plat_probe,
534    .remove = ramips_eth_plat_remove,
535    .driver = {
536        .name = "ramips_eth",
537        .owner = THIS_MODULE,
538    },
539};
540
541static int __init
542ramips_eth_init(void)
543{
544    int ret;
545
546    ret = rt305x_esw_init();
547    if (ret)
548        return ret;
549
550    ret = platform_driver_register(&ramips_eth_driver);
551    if (ret) {
552        printk(KERN_ERR
553               "ramips_eth: Error registering platfom driver!\n");
554        goto esw_cleanup;
555    }
556
557    return 0;
558
559esw_cleanup:
560    rt305x_esw_exit();
561    return ret;
562}
563
564static void __exit
565ramips_eth_cleanup(void)
566{
567    platform_driver_unregister(&ramips_eth_driver);
568    rt305x_esw_exit();
569}
570
571module_init(ramips_eth_init);
572module_exit(ramips_eth_cleanup);
573
574MODULE_LICENSE("GPL");
575MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
576MODULE_DESCRIPTION("ethernet driver for ramips boards");
577

Archive Download this file

Branches:
backfire
history
master
release_2010-11-17
release_2010-12-14
release_2011-02-23
release_2011-05-28
release_2011-08-27
release_2011-11-13
release_2012-03-18
release_2012-04-09
release_2012-10-11
uclibc_nptl



interactive