1 /*
2 * Driver for the MPC5200 Fast Ethernet Controller
3 *
4 * Originally written by Dale Farnsworth <dfarnsworth@mvista.com> and
5 * now maintained by Sylvain Munaut <tnt@246tNt.com>
6 *
7 * Copyright (C) 2007 Domen Puncer, Telargo, Inc.
8 * Copyright (C) 2007 Sylvain Munaut <tnt@246tNt.com>
9 * Copyright (C) 2003-2004 MontaVista, Software, Inc.
10 *
11 * This file is licensed under the terms of the GNU General Public License
12 * version 2. This program is licensed "as is" without any warranty of any
13 * kind, whether express or implied.
14 *
15 */
16
17 #include <linux/module.h>
18
19 #include <linux/kernel.h>
20 #include <linux/types.h>
21 #include <linux/spinlock.h>
22 #include <linux/errno.h>
23 #include <linux/init.h>
24 #include <linux/crc32.h>
25 #include <linux/hardirq.h>
26 #include <linux/delay.h>
27 #include <linux/of_device.h>
28 #include <linux/of_platform.h>
29
30 #include <linux/netdevice.h>
31 #include <linux/etherdevice.h>
32 #include <linux/ethtool.h>
33 #include <linux/skbuff.h>
34
35 #include <asm/io.h>
36 #include <asm/delay.h>
37 #include <asm/mpc52xx.h>
38
39 #include <sysdev/bestcomm/bestcomm.h>
40 #include <sysdev/bestcomm/fec.h>
41
42 #include "fec_mpc52xx.h"
43
44 #define DRIVER_NAME "mpc52xx-fec"
45
46 static irqreturn_t mpc52xx_fec_interrupt(int, void *);
47 static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *);
48 static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *);
49 static void mpc52xx_fec_stop(struct net_device *dev);
50 static void mpc52xx_fec_start(struct net_device *dev);
51 static void mpc52xx_fec_reset(struct net_device *dev);
52
53 static u8 mpc52xx_fec_mac_addr[6];
54 module_param_array_named(mac, mpc52xx_fec_mac_addr, byte, NULL, 0);
55 MODULE_PARM_DESC(mac, "six hex digits, ie. 0x1,0x2,0xc0,0x01,0xba,0xbe");
56
57 #define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \
58 NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFDOWN )
59 static int debug = -1; /* the above default */
60 module_param(debug, int, 0);
61 MODULE_PARM_DESC(debug, "debugging messages level");
62
63 static void mpc52xx_fec_tx_timeout(struct net_device *dev)
64 {
65 dev_warn(&dev->dev, "transmit timed out\n");
66
67 mpc52xx_fec_reset(dev);
68
69 dev->stats.tx_errors++;
70
71 netif_wake_queue(dev);
72 }
73
74 static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac)
75 {
76 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
77 struct mpc52xx_fec __iomem *fec = priv->fec;
78
79 out_be32(&fec->paddr1, *(u32 *)(&mac[0]));
80 out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE);
81 }
82
83 static void mpc52xx_fec_get_paddr(struct net_device *dev, u8 *mac)
84 {
85 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
86 struct mpc52xx_fec __iomem *fec = priv->fec;
87
88 *(u32 *)(&mac[0]) = in_be32(&fec->paddr1);
89 *(u16 *)(&mac[4]) = in_be32(&fec->paddr2) >> 16;
90 }
91
92 static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr)
93 {
94 struct sockaddr *sock = addr;
95
96 memcpy(dev->dev_addr, sock->sa_data, dev->addr_len);
97
98 mpc52xx_fec_set_paddr(dev, sock->sa_data);
99 return 0;
100 }
101
102 static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s)
103 {
104 while (!bcom_queue_empty(s)) {
105 struct bcom_fec_bd *bd;
106 struct sk_buff *skb;
107
108 skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd);
109 dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_FROM_DEVICE);
110 kfree_skb(skb);
111 }
112 }
113
114 static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
115 {
116 while (!bcom_queue_full(rxtsk)) {
117 struct sk_buff *skb;
118 struct bcom_fec_bd *bd;
119
120 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
121 if (skb == NULL)
122 return -EAGAIN;
123
124 /* zero out the initial receive buffers to aid debugging */
125 memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
126
127 bd = (struct bcom_fec_bd *)bcom_prepare_next_buffer(rxtsk);
128
129 bd->status = FEC_RX_BUFFER_SIZE;
130 bd->skb_pa = dma_map_single(&dev->dev, skb->data,
131 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
132
133 bcom_submit_next_buffer(rxtsk, skb);
134 }
135
136 return 0;
137 }
138
139 /* based on generic_adjust_link from fs_enet-main.c */
140 static void mpc52xx_fec_adjust_link(struct net_device *dev)
141 {
142 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
143 struct phy_device *phydev = priv->phydev;
144 int new_state = 0;
145
146 if (phydev->link != PHY_DOWN) {
147 if (phydev->duplex != priv->duplex) {
148 struct mpc52xx_fec __iomem *fec = priv->fec;
149 u32 rcntrl;
150 u32 tcntrl;
151
152 new_state = 1;
153 priv->duplex = phydev->duplex;
154
155 rcntrl = in_be32(&fec->r_cntrl);
156 tcntrl = in_be32(&fec->x_cntrl);
157
158 rcntrl &= ~FEC_RCNTRL_DRT;
159 tcntrl &= ~FEC_TCNTRL_FDEN;
160 if (phydev->duplex == DUPLEX_FULL)
161 tcntrl |= FEC_TCNTRL_FDEN; /* FD enable */
162 else
163 rcntrl |= FEC_RCNTRL_DRT; /* disable Rx on Tx (HD) */
164
165 out_be32(&fec->r_cntrl, rcntrl);
166 out_be32(&fec->x_cntrl, tcntrl);
167 }
168
169 if (phydev->speed != priv->speed) {
170 new_state = 1;
171 priv->speed = phydev->speed;
172 }
173
174 if (priv->link == PHY_DOWN) {
175 new_state = 1;
176 priv->link = phydev->link;
177 netif_schedule(dev);
178 netif_carrier_on(dev);
179 netif_start_queue(dev);
180 }
181
182 } else if (priv->link) {
183 new_state = 1;
184 priv->link = PHY_DOWN;
185 priv->speed = 0;
186 priv->duplex = -1;
187 netif_stop_queue(dev);
188 netif_carrier_off(dev);
189 }
190
191 if (new_state && netif_msg_link(priv))
192 phy_print_status(phydev);
193 }
194
195 static int mpc52xx_fec_init_phy(struct net_device *dev)
196 {
197 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
198 struct phy_device *phydev;
199 char phy_id[BUS_ID_SIZE];
200
201 snprintf(phy_id, BUS_ID_SIZE, PHY_ID_FMT,
202 (unsigned int)dev->base_addr, priv->phy_addr);
203
204 priv->link = PHY_DOWN;
205 priv->speed = 0;
206 priv->duplex = -1;
207
208 phydev = phy_connect(dev, phy_id, &mpc52xx_fec_adjust_link, 0, PHY_INTERFACE_MODE_MII);
209 if (IS_ERR(phydev)) {
210 dev_err(&dev->dev, "phy_connect failed\n");
211 return PTR_ERR(phydev);
212 }
213 dev_info(&dev->dev, "attached phy %i to driver %s\n",
214 phydev->addr, phydev->drv->name);
215
216 priv->phydev = phydev;
217
218 return 0;
219 }
220
221 static int mpc52xx_fec_phy_start(struct net_device *dev)
222 {
223 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
224 int err;
225
226 if (!priv->has_phy)
227 return 0;
228
229 err = mpc52xx_fec_init_phy(dev);
230 if (err) {
231 dev_err(&dev->dev, "mpc52xx_fec_init_phy failed\n");
232 return err;
233 }
234
235 /* reset phy - this also wakes it from PDOWN */
236 phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
237 phy_start(priv->phydev);
238
239 return 0;
240 }
241
242 static void mpc52xx_fec_phy_stop(struct net_device *dev)
243 {
244 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
245
246 if (!priv->has_phy)
247 return;
248
249 phy_disconnect(priv->phydev);
250 /* power down phy */
251 phy_stop(priv->phydev);
252 phy_write(priv->phydev, MII_BMCR, BMCR_PDOWN);
253 }
254
255 static int mpc52xx_fec_phy_mii_ioctl(struct mpc52xx_fec_priv *priv,
256 struct mii_ioctl_data *mii_data, int cmd)
257 {
258 if (!priv->has_phy)
259 return -ENOTSUPP;
260
261 return phy_mii_ioctl(priv->phydev, mii_data, cmd);
262 }
263
264 static void mpc52xx_fec_phy_hw_init(struct mpc52xx_fec_priv *priv)
265 {
266 struct mpc52xx_fec __iomem *fec = priv->fec;
267
268 if (!priv->has_phy)
269 return;
270
271 out_be32(&fec->mii_speed, priv->phy_speed);
272 }
273
274 static int mpc52xx_fec_open(struct net_device *dev)
275 {
276 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
277 int err = -EBUSY;
278
279 if (request_irq(dev->irq, &mpc52xx_fec_interrupt, IRQF_SHARED,
280 DRIVER_NAME "_ctrl", dev)) {
281 dev_err(&dev->dev, "ctrl interrupt request failed\n");
282 goto out;
283 }
284 if (request_irq(priv->r_irq, &mpc52xx_fec_rx_interrupt, 0,
285 DRIVER_NAME "_rx", dev)) {
286 dev_err(&dev->dev, "rx interrupt request failed\n");
287 goto free_ctrl_irq;
288 }
289 if (request_irq(priv->t_irq, &mpc52xx_fec_tx_interrupt, 0,
290 DRIVER_NAME "_tx", dev)) {
291 dev_err(&dev->dev, "tx interrupt request failed\n");
292 goto free_2irqs;
293 }
294
295 bcom_fec_rx_reset(priv->rx_dmatsk);
296 bcom_fec_tx_reset(priv->tx_dmatsk);
297
298 err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
299 if (err) {
300 dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
301 goto free_irqs;
302 }
303
304 err = mpc52xx_fec_phy_start(dev);
305 if (err)
306 goto free_skbs;
307
308 bcom_enable(priv->rx_dmatsk);
309 bcom_enable(priv->tx_dmatsk);
310
311 mpc52xx_fec_start(dev);
312
313 netif_start_queue(dev);
314
315 return 0;
316
317 free_skbs:
318 mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
319
320 free_irqs:
321 free_irq(priv->t_irq, dev);
322 free_2irqs:
323 free_irq(priv->r_irq, dev);
324 free_ctrl_irq:
325 free_irq(dev->irq, dev);
326 out:
327
328 return err;
329 }
330
331 static int mpc52xx_fec_close(struct net_device *dev)
332 {
333 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
334
335 netif_stop_queue(dev);
336
337 mpc52xx_fec_stop(dev);
338
339 mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
340
341 free_irq(dev->irq, dev);
342 free_irq(priv->r_irq, dev);
343 free_irq(priv->t_irq, dev);
344
345 mpc52xx_fec_phy_stop(dev);
346
347 return 0;
348 }
349
350 /* This will only be invoked if your driver is _not_ in XOFF state.
351 * What this means is that you need not check it, and that this
352 * invariant will hold if you make sure that the netif_*_queue()
353 * calls are done at the proper times.
354 */
355 static int mpc52xx_fec_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
356 {
357 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
358 struct bcom_fec_bd *bd;
359
360 if (bcom_queue_full(priv->tx_dmatsk)) {
361 if (net_ratelimit())
362 dev_err(&dev->dev, "transmit queue overrun\n");
363 return 1;
364 }
365
366 spin_lock_irq(&priv->lock);
367 dev->trans_start = jiffies;
368
369 bd = (struct bcom_fec_bd *)
370 bcom_prepare_next_buffer(priv->tx_dmatsk);
371
372 bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
373 bd->skb_pa = dma_map_single(&dev->dev, skb->data, skb->len, DMA_TO_DEVICE);
374
375 bcom_submit_next_buffer(priv->tx_dmatsk, skb);
376
377 if (bcom_queue_full(priv->tx_dmatsk)) {
378 netif_stop_queue(dev);
379 }
380
381 spin_unlock_irq(&priv->lock);
382
383 return 0;
384 }
385
386 /* This handles BestComm transmit task interrupts
387 */
388 static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
389 {
390 struct net_device *dev = dev_id;
391 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
392
393 spin_lock(&priv->lock);
394
395 while (bcom_buffer_done(priv->tx_dmatsk)) {
396 struct sk_buff *skb;
397 struct bcom_fec_bd *bd;
398 skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
399 (struct bcom_bd **)&bd);
400 dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_TO_DEVICE);
401
402 dev_kfree_skb_irq(skb);
403 }
404
405 netif_wake_queue(dev);
406
407 spin_unlock(&priv->lock);
408
409 return IRQ_HANDLED;
410 }
411
412 static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
413 {
414 struct net_device *dev = dev_id;
415 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
416
417 while (bcom_buffer_done(priv->rx_dmatsk)) {
418 struct sk_buff *skb;
419 struct sk_buff *rskb;
420 struct bcom_fec_bd *bd;
421 u32 status;
422
423 rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
424 (struct bcom_bd **)&bd);
425 dma_unmap_single(&dev->dev, bd->skb_pa, rskb->len, DMA_FROM_DEVICE);
426
427 /* Test for errors in received frame */
428 if (status & BCOM_FEC_RX_BD_ERRORS) {
429 /* Drop packet and reuse the buffer */
430 bd = (struct bcom_fec_bd *)
431 bcom_prepare_next_buffer(priv->rx_dmatsk);
432
433 bd->status = FEC_RX_BUFFER_SIZE;
434 bd->skb_pa = dma_map_single(&dev->dev, rskb->data,
435 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
436
437 bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
438
439 dev->stats.rx_dropped++;
440
441 continue;
442 }
443
444 /* skbs are allocated on open, so now we allocate a new one,
445 * and remove the old (with the packet) */
446 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
447 if (skb) {
448 /* Process the received skb */
449 int length = status & BCOM_FEC_RX_BD_LEN_MASK;
450
451 skb_put(rskb, length - 4); /* length without CRC32 */
452
453 rskb->dev = dev;
454 rskb->protocol = eth_type_trans(rskb, dev);
455
456 netif_rx(rskb);
457 dev->last_rx = jiffies;
458 } else {
459 /* Can't get a new one : reuse the same & drop pkt */
460 dev_notice(&dev->dev, "Memory squeeze, dropping packet.\n");
461 dev->stats.rx_dropped++;
462
463 skb = rskb;
464 }
465
466 bd = (struct bcom_fec_bd *)
467 bcom_prepare_next_buffer(priv->rx_dmatsk);
468
469 bd->status = FEC_RX_BUFFER_SIZE;
470 bd->skb_pa = dma_map_single(&dev->dev, skb->data,
471 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
472
473 bcom_submit_next_buffer(priv->rx_dmatsk, skb);
474 }
475
476 return IRQ_HANDLED;
477 }
478
479 static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
480 {
481 struct net_device *dev = dev_id;
482 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
483 struct mpc52xx_fec __iomem *fec = priv->fec;
484 u32 ievent;
485
486 ievent = in_be32(&fec->ievent);
487
488 ievent &= ~FEC_IEVENT_MII; /* mii is handled separately */
489 if (!ievent)
490 return IRQ_NONE;
491
492 out_be32(&fec->ievent, ievent); /* clear pending events */
493
494 if (ievent & ~(FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) {
495 if (ievent & ~FEC_IEVENT_TFINT)
496 dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
497 return IRQ_HANDLED;
498 }
499
500 if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR))
501 dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n");
502 if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
503 dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");
504
505 mpc52xx_fec_reset(dev);
506
507 netif_wake_queue(dev);
508 return IRQ_HANDLED;
509 }
510
511 /*
512 * Get the current statistics.
513 * This may be called with the card open or closed.
514 */
515 static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
516 {
517 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
518 struct net_device_stats *stats = &dev->stats;
519 struct mpc52xx_fec __iomem *fec = priv->fec;
520
521 stats->rx_bytes = in_be32(&fec->rmon_r_octets);
522 stats->rx_packets = in_be32(&fec->rmon_r_packets);
523 stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
524 in_be32(&fec->rmon_r_undersize) +
525 in_be32(&fec->rmon_r_oversize) +
526 in_be32(&fec->rmon_r_frag) +
527 in_be32(&fec->rmon_r_jab);
528
529 stats->tx_bytes = in_be32(&fec->rmon_t_octets);
530 stats->tx_packets = in_be32(&fec->rmon_t_packets);
531 stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
532 in_be32(&fec->rmon_t_undersize) +
533 in_be32(&fec->rmon_t_oversize) +
534 in_be32(&fec->rmon_t_frag) +
535 in_be32(&fec->rmon_t_jab);
536
537 stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
538 stats->collisions = in_be32(&fec->rmon_t_col);
539
540 /* detailed rx_errors: */
541 stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
542 + in_be32(&fec->rmon_r_oversize)
543 + in_be32(&fec->rmon_r_frag)
544 + in_be32(&fec->rmon_r_jab);
545 stats->rx_over_errors = in_be32(&fec->r_macerr);
546 stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
547 stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
548 stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
549 stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);
550
551 /* detailed tx_errors: */
552 stats->tx_aborted_errors = 0;
553 stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
554 stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
555 stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
556 stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);
557
558 return stats;
559 }
560
561 /*
562 * Read MIB counters in order to reset them,
563 * then zero all the stats fields in memory
564 */
565 static void mpc52xx_fec_reset_stats(struct net_device *dev)
566 {
567 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
568 struct mpc52xx_fec __iomem *fec = priv->fec;
569
570 out_be32(&fec->mib_control, FEC_MIB_DISABLE);
571 memset_io(&fec->rmon_t_drop, 0,
572 offsetof(struct mpc52xx_fec, reserved10) -
573 offsetof(struct mpc52xx_fec, rmon_t_drop));
574 out_be32(&fec->mib_control, 0);
575
576 memset(&dev->stats, 0, sizeof(dev->stats));
577 }
578
579 /*
580 * Set or clear the multicast filter for this adaptor.
581 */
582 static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
583 {
584 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
585 struct mpc52xx_fec __iomem *fec = priv->fec;
586 u32 rx_control;
587
588 rx_control = in_be32(&fec->r_cntrl);
589
590 if (dev->flags & IFF_PROMISC) {
591 rx_control |= FEC_RCNTRL_PROM;
592 out_be32(&fec->r_cntrl, rx_control);
593 } else {
594 rx_control &= ~FEC_RCNTRL_PROM;
595 out_be32(&fec->r_cntrl, rx_control);
596
597 if (dev->flags & IFF_ALLMULTI) {
598 out_be32(&fec->gaddr1, 0xffffffff);
599 out_be32(&fec->gaddr2, 0xffffffff);
600 } else {
601 u32 crc;
602 int i;
603 struct dev_mc_list *dmi;
604 u32 gaddr1 = 0x00000000;
605 u32 gaddr2 = 0x00000000;
606
607 dmi = dev->mc_list;
608 for (i=0; i<dev->mc_count; i++) {
609 crc = ether_crc_le(6, dmi->dmi_addr) >> 26;
610 if (crc >= 32)
611 gaddr1 |= 1 << (crc-32);
612 else
613 gaddr2 |= 1 << crc;
614 dmi = dmi->next;
615 }
616 out_be32(&fec->gaddr1, gaddr1);
617 out_be32(&fec->gaddr2, gaddr2);
618 }
619 }
620 }
621
622 /**
623 * mpc52xx_fec_hw_init
624 * @dev: network device
625 *
626 * Setup various hardware setting, only needed once on start
627 */
628 static void mpc52xx_fec_hw_init(struct net_device *dev)
629 {
630 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
631 struct mpc52xx_fec __iomem *fec = priv->fec;
632 int i;
633
634 /* Whack a reset. We should wait for this. */
635 out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
636 for (i = 0; i < FEC_RESET_DELAY; ++i) {
637 if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
638 break;
639 udelay(1);
640 }
641 if (i == FEC_RESET_DELAY)
642 dev_err(&dev->dev, "FEC Reset timeout!\n");
643
644 /* set pause to 0x20 frames */
645 out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);
646
647 /* high service request will be deasserted when there's < 7 bytes in fifo
648 * low service request will be deasserted when there's < 4*7 bytes in fifo
649 */
650 out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
651 out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
652
653 /* alarm when <= x bytes in FIFO */
654 out_be32(&fec->rfifo_alarm, 0x0000030c);
655 out_be32(&fec->tfifo_alarm, 0x00000100);
656
657 /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
658 out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);
659
660 /* enable crc generation */
661 out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
662 out_be32(&fec->iaddr1, 0x00000000); /* No individual filter */
663 out_be32(&fec->iaddr2, 0x00000000); /* No individual filter */
664
665 /* set phy speed.
666 * this can't be done in phy driver, since it needs to be called
667 * before fec stuff (even on resume) */
668 mpc52xx_fec_phy_hw_init(priv);
669 }
670
671 /**
672 * mpc52xx_fec_start
673 * @dev: network device
674 *
675 * This function is called to start or restart the FEC during a link
676 * change. This happens on fifo errors or when switching between half
677 * and full duplex.
678 */
679 static void mpc52xx_fec_start(struct net_device *dev)
680 {
681 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
682 struct mpc52xx_fec __iomem *fec = priv->fec;
683 u32 rcntrl;
684 u32 tcntrl;
685 u32 tmp;
686
687 /* clear sticky error bits */
688 tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
689 out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
690 out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);
691
692 /* FIFOs will reset on mpc52xx_fec_enable */
693 out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);
694
695 /* Set station address. */
696 mpc52xx_fec_set_paddr(dev, dev->dev_addr);
697
698 mpc52xx_fec_set_multicast_list(dev);
699
700 /* set max frame len, enable flow control, select mii mode */
701 rcntrl = FEC_RX_BUFFER_SIZE << 16; /* max frame length */
702 rcntrl |= FEC_RCNTRL_FCE;
703
704 if (priv->has_phy)
705 rcntrl |= FEC_RCNTRL_MII_MODE;
706
707 if (priv->duplex == DUPLEX_FULL)
708 tcntrl = FEC_TCNTRL_FDEN; /* FD enable */
709 else {
710 rcntrl |= FEC_RCNTRL_DRT; /* disable Rx on Tx (HD) */
711 tcntrl = 0;
712 }
713 out_be32(&fec->r_cntrl, rcntrl);
714 out_be32(&fec->x_cntrl, tcntrl);
715
716 /* Clear any outstanding interrupt. */
717 out_be32(&fec->ievent, 0xffffffff);
718
719 /* Enable interrupts we wish to service. */
720 out_be32(&fec->imask, FEC_IMASK_ENABLE);
721
722 /* And last, enable the transmit and receive processing. */
723 out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
724 out_be32(&fec->r_des_active, 0x01000000);
725 }
726
727 /**
728 * mpc52xx_fec_stop
729 * @dev: network device
730 *
731 * stop all activity on fec and empty dma buffers
732 */
733 static void mpc52xx_fec_stop(struct net_device *dev)
734 {
735 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
736 struct mpc52xx_fec __iomem *fec = priv->fec;
737 unsigned long timeout;
738
739 /* disable all interrupts */
740 out_be32(&fec->imask, 0);
741
742 /* Disable the rx task. */
743 bcom_disable(priv->rx_dmatsk);
744
745 /* Wait for tx queue to drain, but only if we're in process context */
746 if (!in_interrupt()) {
747 timeout = jiffies + msecs_to_jiffies(2000);
748 while (time_before(jiffies, timeout) &&
749 !bcom_queue_empty(priv->tx_dmatsk))
750 msleep(100);
751
752 if (time_after_eq(jiffies, timeout))
753 dev_err(&dev->dev, "queues didn't drain\n");
754 #if 1
755 if (time_after_eq(jiffies, timeout)) {
756 dev_err(&dev->dev, " tx: index: %i, outdex: %i\n",
757 priv->tx_dmatsk->index,
758 priv->tx_dmatsk->outdex);
759 dev_err(&dev->dev, " rx: index: %i, outdex: %i\n",
760 priv->rx_dmatsk->index,
761 priv->rx_dmatsk->outdex);
762 }
763 #endif
764 }
765
766 bcom_disable(priv->tx_dmatsk);
767
768 /* Stop FEC */
769 out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
770
771 return;
772 }
773
774 /* reset fec and bestcomm tasks */
775 static void mpc52xx_fec_reset(struct net_device *dev)
776 {
777 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
778 struct mpc52xx_fec __iomem *fec = priv->fec;
779
780 mpc52xx_fec_stop(dev);
781
782 out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
783 out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);
784
785 mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
786
787 mpc52xx_fec_hw_init(dev);
788
789 phy_stop(priv->phydev);
790 phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
791 phy_start(priv->phydev);
792
793 bcom_fec_rx_reset(priv->rx_dmatsk);
794 bcom_fec_tx_reset(priv->tx_dmatsk);
795
796 mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
797
798 bcom_enable(priv->rx_dmatsk);
799 bcom_enable(priv->tx_dmatsk);
800
801 mpc52xx_fec_start(dev);
802 }
803
804
805 /* ethtool interface */
806 static void mpc52xx_fec_get_drvinfo(struct net_device *dev,
807 struct ethtool_drvinfo *info)
808 {
809 strcpy(info->driver, DRIVER_NAME);
810 }
811
812 static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
813 {
814 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
815 return phy_ethtool_gset(priv->phydev, cmd);
816 }
817
818 static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
819 {
820 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
821 return phy_ethtool_sset(priv->phydev, cmd);
822 }
823
824 static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
825 {
826 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
827 return priv->msg_enable;
828 }
829
830 static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
831 {
832 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
833 priv->msg_enable = level;
834 }
835
836 static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
837 .get_drvinfo = mpc52xx_fec_get_drvinfo,
838 .get_settings = mpc52xx_fec_get_settings,
839 .set_settings = mpc52xx_fec_set_settings,
840 .get_link = ethtool_op_get_link,
841 .get_msglevel = mpc52xx_fec_get_msglevel,
842 .set_msglevel = mpc52xx_fec_set_msglevel,
843 };
844
845
846 static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
847 {
848 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
849
850 return mpc52xx_fec_phy_mii_ioctl(priv, if_mii(rq), cmd);
851 }
852
853 /* ======================================================================== */
854 /* OF Driver */
855 /* ======================================================================== */
856
857 static int __devinit
858 mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
859 {
860 int rv;
861 struct net_device *ndev;
862 struct mpc52xx_fec_priv *priv = NULL;
863 struct resource mem;
864 const phandle *ph;
865
866 phys_addr_t rx_fifo;
867 phys_addr_t tx_fifo;
868
869 /* Get the ether ndev & it's private zone */
870 ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
871 if (!ndev)
872 return -ENOMEM;
873
874 priv = netdev_priv(ndev);
875
876 /* Reserve FEC control zone */
877 rv = of_address_to_resource(op->node, 0, &mem);
878 if (rv) {
879 printk(KERN_ERR DRIVER_NAME ": "
880 "Error while parsing device node resource\n" );
881 return rv;
882 }
883 if ((mem.end - mem.start + 1) < sizeof(struct mpc52xx_fec)) {
884 printk(KERN_ERR DRIVER_NAME
885 " - invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
886 (unsigned long)(mem.end - mem.start + 1), sizeof(struct mpc52xx_fec));
887 return -EINVAL;
888 }
889
890 if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec), DRIVER_NAME))
891 return -EBUSY;
892
893 /* Init ether ndev with what we have */
894 ndev->open = mpc52xx_fec_open;
895 ndev->stop = mpc52xx_fec_close;
896 ndev->hard_start_xmit = mpc52xx_fec_hard_start_xmit;
897 ndev->do_ioctl = mpc52xx_fec_ioctl;
898 ndev->ethtool_ops = &mpc52xx_fec_ethtool_ops;
899 ndev->get_stats = mpc52xx_fec_get_stats;
900 ndev->set_mac_address = mpc52xx_fec_set_mac_address;
901 ndev->set_multicast_list = mpc52xx_fec_set_multicast_list;
902 ndev->tx_timeout = mpc52xx_fec_tx_timeout;
903 ndev->watchdog_timeo = FEC_WATCHDOG_TIMEOUT;
904 ndev->base_addr = mem.start;
905
906 priv->t_irq = priv->r_irq = ndev->irq = NO_IRQ; /* IRQ are free for now */
907
908 spin_lock_init(&priv->lock);
909
910 /* ioremap the zones */
911 priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));
912
913 if (!priv->fec) {
914 rv = -ENOMEM;
915 goto probe_error;
916 }
917
918 /* Bestcomm init */
919 rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
920 tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);
921
922 priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
923 priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);
924
925 if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
926 printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
927 rv = -ENOMEM;
928 goto probe_error;
929 }
930
931 /* Get the IRQ we need one by one */
932 /* Control */
933 ndev->irq = irq_of_parse_and_map(op->node, 0);
934
935 /* RX */
936 priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);
937
938 /* TX */
939 priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);
940
941 /* MAC address init */
942 if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
943 memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
944 else
945 mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);
946
947 priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
948 priv->duplex = DUPLEX_FULL;
949
950 /* is the phy present in device tree? */
951 ph = of_get_property(op->node, "phy-handle", NULL);
952 if (ph) {
953 const unsigned int *prop;
954 struct device_node *phy_dn;
955 priv->has_phy = 1;
956
957 phy_dn = of_find_node_by_phandle(*ph);
958 prop = of_get_property(phy_dn, "reg", NULL);
959 priv->phy_addr = *prop;
960
961 of_node_put(phy_dn);
962
963 /* Phy speed */
964 priv->phy_speed = ((mpc52xx_find_ipb_freq(op->node) >> 20) / 5) << 1;
965 } else {
966 dev_info(&ndev->dev, "can't find \"phy-handle\" in device"
967 " tree, using 7-wire mode\n");
968 }
969
970 /* Hardware init */
971 mpc52xx_fec_hw_init(ndev);
972
973 mpc52xx_fec_reset_stats(ndev);
974
975 SET_NETDEV_DEV(ndev, &op->dev);
976
977 /* Register the new network device */
978 rv = register_netdev(ndev);
979 if (rv < 0)
980 goto probe_error;
981
982 /* We're done ! */
983 dev_set_drvdata(&op->dev, ndev);
984
985 return 0;
986
987
988 /* Error handling - free everything that might be allocated */
989 probe_error:
990
991 irq_dispose_mapping(ndev->irq);
992
993 if (priv->rx_dmatsk)
994 bcom_fec_rx_release(priv->rx_dmatsk);
995 if (priv->tx_dmatsk)
996 bcom_fec_tx_release(priv->tx_dmatsk);
997
998 if (priv->fec)
999 iounmap(priv->fec);
1000
1001 release_mem_region(mem.start, sizeof(struct mpc52xx_fec));
1002
1003 free_netdev(ndev);
1004
1005 return rv;
1006 }
1007
1008 static int
1009 mpc52xx_fec_remove(struct of_device *op)
1010 {
1011 struct net_device *ndev;
1012 struct mpc52xx_fec_priv *priv;
1013
1014 ndev = dev_get_drvdata(&op->dev);
1015 priv = netdev_priv(ndev);
1016
1017 unregister_netdev(ndev);
1018
1019 irq_dispose_mapping(ndev->irq);
1020
1021 bcom_fec_rx_release(priv->rx_dmatsk);
1022 bcom_fec_tx_release(priv->tx_dmatsk);
1023
1024 iounmap(priv->fec);
1025
1026 release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));
1027
1028 free_netdev(ndev);
1029
1030 dev_set_drvdata(&op->dev, NULL);
1031 return 0;
1032 }
1033
1034 #ifdef CONFIG_PM
1035 static int mpc52xx_fec_of_suspend(struct of_device *op, pm_message_t state)
1036 {
1037 struct net_device *dev = dev_get_drvdata(&op->dev);
1038
1039 if (netif_running(dev))
1040 mpc52xx_fec_close(dev);
1041
1042 return 0;
1043 }
1044
1045 static int mpc52xx_fec_of_resume(struct of_device *op)
1046 {
1047 struct net_device *dev = dev_get_drvdata(&op->dev);
1048
1049 mpc52xx_fec_hw_init(dev);
1050 mpc52xx_fec_reset_stats(dev);
1051
1052 if (netif_running(dev))
1053 mpc52xx_fec_open(dev);
1054
1055 return 0;
1056 }
1057 #endif
1058
1059 static struct of_device_id mpc52xx_fec_match[] = {
1060 { .type = "network", .compatible = "fsl,mpc5200b-fec", },
1061 { .type = "network", .compatible = "fsl,mpc5200-fec", },
1062 { .type = "network", .compatible = "mpc5200-fec", },
1063 { }
1064 };
1065
1066 MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);
1067
1068 static struct of_platform_driver mpc52xx_fec_driver = {
1069 .owner = THIS_MODULE,
1070 .name = DRIVER_NAME,
1071 .match_table = mpc52xx_fec_match,
1072 .probe = mpc52xx_fec_probe,
1073 .remove = mpc52xx_fec_remove,
1074 #ifdef CONFIG_PM
1075 .suspend = mpc52xx_fec_of_suspend,
1076 .resume = mpc52xx_fec_of_resume,
1077 #endif
1078 };
1079
1080
1081 /* ======================================================================== */
1082 /* Module */
1083 /* ======================================================================== */
1084
1085 static int __init
1086 mpc52xx_fec_init(void)
1087 {
1088 #ifdef CONFIG_FEC_MPC52xx_MDIO
1089 int ret;
1090 ret = of_register_platform_driver(&mpc52xx_fec_mdio_driver);
1091 if (ret) {
1092 printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
1093 return ret;
1094 }
1095 #endif
1096 return of_register_platform_driver(&mpc52xx_fec_driver);
1097 }
1098
1099 static void __exit
1100 mpc52xx_fec_exit(void)
1101 {
1102 of_unregister_platform_driver(&mpc52xx_fec_driver);
1103 #ifdef CONFIG_FEC_MPC52xx_MDIO
1104 of_unregister_platform_driver(&mpc52xx_fec_mdio_driver);
1105 #endif
1106 }
1107
1108
1109 module_init(mpc52xx_fec_init);
1110 module_exit(mpc52xx_fec_exit);
1111
1112 MODULE_LICENSE("GPL");
1113 MODULE_AUTHOR("Dale Farnsworth");
1114 MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");
1115
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