ramips: raeth: cleanup DMA API usage in ramips_eth_hard_start_xmit
[openwrt.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; 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
37 static inline int rt305x_esw_init(void) { return 0; }
38 static inline void rt305x_esw_exit(void) { }
39 #endif
40
41 #define phys_to_bus(a)  (a & 0x1FFFFFFF)
42
43 static struct net_device * ramips_dev;
44 static void __iomem *ramips_fe_base = 0;
45
46 static inline void
47 ramips_fe_wr(u32 val, unsigned reg)
48 {
49         __raw_writel(val, ramips_fe_base + reg);
50 }
51
52 static inline u32
53 ramips_fe_rr(unsigned reg)
54 {
55         return __raw_readl(ramips_fe_base + reg);
56 }
57
58 static inline void
59 ramips_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
67 static inline void
68 ramips_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
76 static inline void
77 ramips_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
85 static void
86 ramips_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
120 static inline void ramips_setup_mdio_cfg(struct raeth_priv *re)
121 {
122 }
123 #endif /* CONFIG_RALINK_RT288X */
124
125 static void
126 ramips_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                         dma_unmap_single(NULL, re->rx_dma[i], MAX_RX_LENGTH,
133                                          DMA_FROM_DEVICE);
134                         dev_kfree_skb_any(re->rx_skb[i]);
135                 }
136
137         if (re->rx)
138                 dma_free_coherent(NULL,
139                                   NUM_RX_DESC * sizeof(struct ramips_rx_dma),
140                                   re->rx, re->rx_desc_dma);
141
142         if (re->tx)
143                 dma_free_coherent(NULL,
144                                   NUM_TX_DESC * sizeof(struct ramips_tx_dma),
145                                   re->tx, re->tx_desc_dma);
146 }
147
148 static int
149 ramips_alloc_dma(struct raeth_priv *re)
150 {
151         int err = -ENOMEM;
152         int i;
153
154         re->skb_free_idx = 0;
155
156         /* setup tx ring */
157         re->tx = dma_alloc_coherent(NULL,
158                                     NUM_TX_DESC * sizeof(struct ramips_tx_dma),
159                                     &re->tx_desc_dma, GFP_ATOMIC);
160         if (!re->tx)
161                 goto err_cleanup;
162
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);
167         }
168
169         /* setup rx ring */
170         re->rx = dma_alloc_coherent(NULL,
171                                     NUM_RX_DESC * sizeof(struct ramips_rx_dma),
172                                     &re->rx_desc_dma, GFP_ATOMIC);
173         if (!re->rx)
174                 goto err_cleanup;
175
176         memset(re->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
177         for (i = 0; i < NUM_RX_DESC; i++) {
178                 dma_addr_t dma_addr;
179                 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH +
180                                                         NET_IP_ALIGN);
181
182                 if (!new_skb)
183                         goto err_cleanup;
184
185                 skb_reserve(new_skb, NET_IP_ALIGN);
186
187                 dma_addr = dma_map_single(NULL, 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;
193         }
194
195         return 0;
196
197  err_cleanup:
198         ramips_cleanup_dma(re);
199         return err;
200 }
201
202 static void
203 ramips_setup_dma(struct raeth_priv *re)
204 {
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);
209
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);
214 }
215
216 static int
217 ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
218 {
219         struct raeth_priv *priv = netdev_priv(dev);
220         unsigned long tx;
221         unsigned int tx_next;
222         dma_addr_t mapped_addr;
223
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)) {
227                                 printk(KERN_ERR
228                                        "ramips_eth: skb_padto failed\n");
229                                 kfree_skb(skb);
230                                 return 0;
231                         }
232                         skb_put(skb, priv->plat->min_pkt_len - skb->len);
233                 }
234         }
235
236         dev->trans_start = jiffies;
237         mapped_addr = dma_map_single(NULL, skb->data, skb->len, DMA_TO_DEVICE);
238
239         spin_lock(&priv->page_lock);
240         tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
241         tx_next = (tx + 1) % NUM_TX_DESC;
242
243         if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
244             !(priv->tx[tx].txd2 & TX_DMA_DONE) ||
245             !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
246                 goto out;
247
248         priv->tx[tx].txd1 = (unsigned int) mapped_addr;
249         priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
250         priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
251         dev->stats.tx_packets++;
252         dev->stats.tx_bytes += skb->len;
253         priv->tx_skb[tx] = skb;
254         wmb();
255         ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
256         spin_unlock(&priv->page_lock);
257         return NETDEV_TX_OK;
258
259  out:
260         spin_unlock(&priv->page_lock);
261         dev->stats.tx_dropped++;
262         kfree_skb(skb);
263         return NETDEV_TX_OK;
264 }
265
266 static void
267 ramips_eth_rx_hw(unsigned long ptr)
268 {
269         struct net_device *dev = (struct net_device *) ptr;
270         struct raeth_priv *priv = netdev_priv(dev);
271         int rx;
272         int max_rx = 16;
273
274         while (max_rx) {
275                 struct sk_buff *rx_skb, *new_skb;
276                 int pktlen;
277
278                 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
279                 if (!(priv->rx[rx].rxd2 & RX_DMA_DONE))
280                         break;
281                 max_rx--;
282
283                 rx_skb = priv->rx_skb[rx];
284                 pktlen = RX_DMA_PLEN0(priv->rx[rx].rxd2);
285
286                 new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + NET_IP_ALIGN);
287                 /* Reuse the buffer on allocation failures */
288                 if (new_skb) {
289                         dma_addr_t dma_addr;
290
291                         dma_unmap_single(NULL, priv->rx_dma[rx], MAX_RX_LENGTH,
292                                          DMA_FROM_DEVICE);
293
294                         skb_put(rx_skb, pktlen);
295                         rx_skb->dev = dev;
296                         rx_skb->protocol = eth_type_trans(rx_skb, dev);
297                         rx_skb->ip_summed = CHECKSUM_NONE;
298                         dev->stats.rx_packets++;
299                         dev->stats.rx_bytes += pktlen;
300                         netif_rx(rx_skb);
301
302                         priv->rx_skb[rx] = new_skb;
303                         skb_reserve(new_skb, NET_IP_ALIGN);
304
305                         dma_addr = dma_map_single(NULL,
306                                                   new_skb->data,
307                                                   MAX_RX_LENGTH,
308                                                   DMA_FROM_DEVICE);
309                         priv->rx_dma[rx] = dma_addr;
310                         priv->rx[rx].rxd1 = (unsigned int) dma_addr;
311                 } else {
312                         dev->stats.rx_dropped++;
313                 }
314
315                 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
316                 wmb();
317                 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
318         }
319
320         if (max_rx == 0)
321                 tasklet_schedule(&priv->rx_tasklet);
322         else
323                 ramips_fe_int_enable(RAMIPS_RX_DLY_INT);
324 }
325
326 static void
327 ramips_eth_tx_housekeeping(unsigned long ptr)
328 {
329         struct net_device *dev = (struct net_device*)ptr;
330         struct raeth_priv *priv = netdev_priv(dev);
331
332         spin_lock(&priv->page_lock);
333         while ((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
334                (priv->tx_skb[priv->skb_free_idx])) {
335                 dev_kfree_skb_irq(priv->tx_skb[priv->skb_free_idx]);
336                 priv->tx_skb[priv->skb_free_idx] = 0;
337                 priv->skb_free_idx++;
338                 if (priv->skb_free_idx >= NUM_TX_DESC)
339                         priv->skb_free_idx = 0;
340         }
341         spin_unlock(&priv->page_lock);
342
343         ramips_fe_int_enable(RAMIPS_TX_DLY_INT);
344 }
345
346 static void
347 ramips_eth_timeout(struct net_device *dev)
348 {
349         struct raeth_priv *priv = netdev_priv(dev);
350
351         tasklet_schedule(&priv->tx_housekeeping_tasklet);
352 }
353
354 static irqreturn_t
355 ramips_eth_irq(int irq, void *dev)
356 {
357         struct raeth_priv *priv = netdev_priv(dev);
358         unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
359
360         ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
361
362         if (fe_int & RAMIPS_RX_DLY_INT) {
363                 ramips_fe_int_disable(RAMIPS_RX_DLY_INT);
364                 tasklet_schedule(&priv->rx_tasklet);
365         }
366
367         if (fe_int & RAMIPS_TX_DLY_INT) {
368                 ramips_fe_int_disable(RAMIPS_TX_DLY_INT);
369                 tasklet_schedule(&priv->tx_housekeeping_tasklet);
370         }
371
372         return IRQ_HANDLED;
373 }
374
375 static int
376 ramips_eth_open(struct net_device *dev)
377 {
378         struct raeth_priv *priv = netdev_priv(dev);
379         int err;
380
381         err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
382                           dev->name, dev);
383         if (err)
384                 return err;
385
386         err = ramips_alloc_dma(priv);
387         if (err)
388                 goto err_free_irq;
389
390         ramips_hw_set_macaddr(dev->dev_addr);
391
392         ramips_setup_dma(priv);
393         ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
394                 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
395                 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
396                 RAMIPS_PDMA_GLO_CFG);
397         ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
398                 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
399                 ((priv->plat->sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
400                 RAMIPS_FE_GLO_CFG);
401
402         tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
403                      (unsigned long)dev);
404         tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
405
406         ramips_setup_mdio_cfg(priv);
407
408         ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
409         ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
410         ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
411                 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
412                 RAMIPS_GDMA1_FWD_CFG);
413         ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
414                 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
415                 RAMIPS_CDMA_CSG_CFG);
416         ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
417         ramips_fe_wr(1, RAMIPS_FE_RST_GL);
418         ramips_fe_wr(0, RAMIPS_FE_RST_GL);
419
420         netif_start_queue(dev);
421         return 0;
422
423  err_free_irq:
424         free_irq(dev->irq, dev);
425         return err;
426 }
427
428 static int
429 ramips_eth_stop(struct net_device *dev)
430 {
431         struct raeth_priv *priv = netdev_priv(dev);
432
433         ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
434                      ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
435                      RAMIPS_PDMA_GLO_CFG);
436
437         /* disable all interrupts in the hw */
438         ramips_fe_wr(0, RAMIPS_FE_INT_ENABLE);
439
440         free_irq(dev->irq, dev);
441         netif_stop_queue(dev);
442         tasklet_kill(&priv->tx_housekeeping_tasklet);
443         tasklet_kill(&priv->rx_tasklet);
444         ramips_cleanup_dma(priv);
445         printk(KERN_DEBUG "ramips_eth: stopped\n");
446         return 0;
447 }
448
449 static int __init
450 ramips_eth_probe(struct net_device *dev)
451 {
452         struct raeth_priv *priv = netdev_priv(dev);
453
454         BUG_ON(!priv->plat->reset_fe);
455         priv->plat->reset_fe();
456         net_srandom(jiffies);
457         memcpy(dev->dev_addr, priv->plat->mac, ETH_ALEN);
458
459         ether_setup(dev);
460         dev->mtu = 1500;
461         dev->watchdog_timeo = TX_TIMEOUT;
462         spin_lock_init(&priv->page_lock);
463
464         return 0;
465 }
466
467 static const struct net_device_ops ramips_eth_netdev_ops = {
468         .ndo_init               = ramips_eth_probe,
469         .ndo_open               = ramips_eth_open,
470         .ndo_stop               = ramips_eth_stop,
471         .ndo_start_xmit         = ramips_eth_hard_start_xmit,
472         .ndo_tx_timeout         = ramips_eth_timeout,
473         .ndo_change_mtu         = eth_change_mtu,
474         .ndo_set_mac_address    = eth_mac_addr,
475         .ndo_validate_addr      = eth_validate_addr,
476 };
477
478 static int
479 ramips_eth_plat_probe(struct platform_device *plat)
480 {
481         struct raeth_priv *priv;
482         struct ramips_eth_platform_data *data = plat->dev.platform_data;
483         struct resource *res;
484         int err;
485
486         if (!data) {
487                 dev_err(&plat->dev, "no platform data specified\n");
488                 return -EINVAL;
489         }
490
491         res = platform_get_resource(plat, IORESOURCE_MEM, 0);
492         if (!res) {
493                 dev_err(&plat->dev, "no memory resource found\n");
494                 return -ENXIO;
495         }
496
497         ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
498         if (!ramips_fe_base)
499                 return -ENOMEM;
500
501         ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
502         if (!ramips_dev) {
503                 dev_err(&plat->dev, "alloc_etherdev failed\n");
504                 err = -ENOMEM;
505                 goto err_unmap;
506         }
507
508         strcpy(ramips_dev->name, "eth%d");
509         ramips_dev->irq = platform_get_irq(plat, 0);
510         if (ramips_dev->irq < 0) {
511                 dev_err(&plat->dev, "no IRQ resource found\n");
512                 err = -ENXIO;
513                 goto err_free_dev;
514         }
515         ramips_dev->addr_len = ETH_ALEN;
516         ramips_dev->base_addr = (unsigned long)ramips_fe_base;
517         ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
518
519         priv = netdev_priv(ramips_dev);
520
521         priv->speed = data->speed;
522         priv->duplex = data->duplex;
523         priv->rx_fc = data->rx_fc;
524         priv->tx_fc = data->tx_fc;
525         priv->plat = data;
526
527         err = register_netdev(ramips_dev);
528         if (err) {
529                 dev_err(&plat->dev, "error bringing up device\n");
530                 goto err_free_dev;
531         }
532
533         printk(KERN_DEBUG "ramips_eth: loaded\n");
534         return 0;
535
536  err_free_dev:
537         kfree(ramips_dev);
538  err_unmap:
539         iounmap(ramips_fe_base);
540         return err;
541 }
542
543 static int
544 ramips_eth_plat_remove(struct platform_device *plat)
545 {
546         unregister_netdev(ramips_dev);
547         free_netdev(ramips_dev);
548         printk(KERN_DEBUG "ramips_eth: unloaded\n");
549         return 0;
550 }
551
552 static struct platform_driver ramips_eth_driver = {
553         .probe = ramips_eth_plat_probe,
554         .remove = ramips_eth_plat_remove,
555         .driver = {
556                 .name = "ramips_eth",
557                 .owner = THIS_MODULE,
558         },
559 };
560
561 static int __init
562 ramips_eth_init(void)
563 {
564         int ret;
565
566         ret = rt305x_esw_init();
567         if (ret)
568                 return ret;
569
570         ret = platform_driver_register(&ramips_eth_driver);
571         if (ret) {
572                 printk(KERN_ERR
573                        "ramips_eth: Error registering platfom driver!\n");
574                 goto esw_cleanup;
575         }
576
577         return 0;
578
579 esw_cleanup:
580         rt305x_esw_exit();
581         return ret;
582 }
583
584 static void __exit
585 ramips_eth_cleanup(void)
586 {
587         platform_driver_unregister(&ramips_eth_driver);
588         rt305x_esw_exit();
589 }
590
591 module_init(ramips_eth_init);
592 module_exit(ramips_eth_cleanup);
593
594 MODULE_LICENSE("GPL");
595 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
596 MODULE_DESCRIPTION("ethernet driver for ramips boards");