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_mdio.h>
29 #include <linux/of_platform.h>
30
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/ethtool.h>
34 #include <linux/skbuff.h>
35
36 #include <asm/io.h>
37 #include <asm/delay.h>
38 #include <asm/mpc52xx.h>
39
40 #include <sysdev/bestcomm/bestcomm.h>
41 #include <sysdev/bestcomm/fec.h>
42
43 #include "fec_mpc52xx.h"
44
45 #define DRIVER_NAME "mpc52xx-fec"
46
47 /* Private driver data structure */
48 struct mpc52xx_fec_priv {
49 struct net_device *ndev;
50 int duplex;
51 int speed;
52 int r_irq;
53 int t_irq;
54 struct mpc52xx_fec __iomem *fec;
55 struct bcom_task *rx_dmatsk;
56 struct bcom_task *tx_dmatsk;
57 spinlock_t lock;
58 int msg_enable;
59
60 /* MDIO link details */
61 unsigned int mdio_speed;
62 struct device_node *phy_node;
63 struct phy_device *phydev;
64 enum phy_state link;
65 int seven_wire_mode;
66 };
67
68
69 static irqreturn_t mpc52xx_fec_interrupt(int, void *);
70 static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *);
71 static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *);
72 static void mpc52xx_fec_stop(struct net_device *dev);
73 static void mpc52xx_fec_start(struct net_device *dev);
74 static void mpc52xx_fec_reset(struct net_device *dev);
75
76 static u8 mpc52xx_fec_mac_addr[6];
77 module_param_array_named(mac, mpc52xx_fec_mac_addr, byte, NULL, 0);
78 MODULE_PARM_DESC(mac, "six hex digits, ie. 0x1,0x2,0xc0,0x01,0xba,0xbe");
79
80 #define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \
81 NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP)
82 static int debug = -1; /* the above default */
83 module_param(debug, int, 0);
84 MODULE_PARM_DESC(debug, "debugging messages level");
85
86 static void mpc52xx_fec_tx_timeout(struct net_device *dev)
87 {
88 dev_warn(&dev->dev, "transmit timed out\n");
89
90 mpc52xx_fec_reset(dev);
91
92 dev->stats.tx_errors++;
93
94 netif_wake_queue(dev);
95 }
96
97 static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac)
98 {
99 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
100 struct mpc52xx_fec __iomem *fec = priv->fec;
101
102 out_be32(&fec->paddr1, *(u32 *)(&mac[0]));
103 out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE);
104 }
105
106 static void mpc52xx_fec_get_paddr(struct net_device *dev, u8 *mac)
107 {
108 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
109 struct mpc52xx_fec __iomem *fec = priv->fec;
110
111 *(u32 *)(&mac[0]) = in_be32(&fec->paddr1);
112 *(u16 *)(&mac[4]) = in_be32(&fec->paddr2) >> 16;
113 }
114
115 static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr)
116 {
117 struct sockaddr *sock = addr;
118
119 memcpy(dev->dev_addr, sock->sa_data, dev->addr_len);
120
121 mpc52xx_fec_set_paddr(dev, sock->sa_data);
122 return 0;
123 }
124
125 static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s)
126 {
127 while (!bcom_queue_empty(s)) {
128 struct bcom_fec_bd *bd;
129 struct sk_buff *skb;
130
131 skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd);
132 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
133 DMA_FROM_DEVICE);
134 kfree_skb(skb);
135 }
136 }
137
138 static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
139 {
140 while (!bcom_queue_full(rxtsk)) {
141 struct sk_buff *skb;
142 struct bcom_fec_bd *bd;
143
144 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
145 if (skb == NULL)
146 return -EAGAIN;
147
148 /* zero out the initial receive buffers to aid debugging */
149 memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
150
151 bd = (struct bcom_fec_bd *)bcom_prepare_next_buffer(rxtsk);
152
153 bd->status = FEC_RX_BUFFER_SIZE;
154 bd->skb_pa = dma_map_single(dev->dev.parent, skb->data,
155 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
156
157 bcom_submit_next_buffer(rxtsk, skb);
158 }
159
160 return 0;
161 }
162
163 /* based on generic_adjust_link from fs_enet-main.c */
164 static void mpc52xx_fec_adjust_link(struct net_device *dev)
165 {
166 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
167 struct phy_device *phydev = priv->phydev;
168 int new_state = 0;
169
170 if (phydev->link != PHY_DOWN) {
171 if (phydev->duplex != priv->duplex) {
172 struct mpc52xx_fec __iomem *fec = priv->fec;
173 u32 rcntrl;
174 u32 tcntrl;
175
176 new_state = 1;
177 priv->duplex = phydev->duplex;
178
179 rcntrl = in_be32(&fec->r_cntrl);
180 tcntrl = in_be32(&fec->x_cntrl);
181
182 rcntrl &= ~FEC_RCNTRL_DRT;
183 tcntrl &= ~FEC_TCNTRL_FDEN;
184 if (phydev->duplex == DUPLEX_FULL)
185 tcntrl |= FEC_TCNTRL_FDEN; /* FD enable */
186 else
187 rcntrl |= FEC_RCNTRL_DRT; /* disable Rx on Tx (HD) */
188
189 out_be32(&fec->r_cntrl, rcntrl);
190 out_be32(&fec->x_cntrl, tcntrl);
191 }
192
193 if (phydev->speed != priv->speed) {
194 new_state = 1;
195 priv->speed = phydev->speed;
196 }
197
198 if (priv->link == PHY_DOWN) {
199 new_state = 1;
200 priv->link = phydev->link;
201 }
202
203 } else if (priv->link) {
204 new_state = 1;
205 priv->link = PHY_DOWN;
206 priv->speed = 0;
207 priv->duplex = -1;
208 }
209
210 if (new_state && netif_msg_link(priv))
211 phy_print_status(phydev);
212 }
213
214 static int mpc52xx_fec_open(struct net_device *dev)
215 {
216 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
217 int err = -EBUSY;
218
219 if (priv->phy_node) {
220 priv->phydev = of_phy_connect(priv->ndev, priv->phy_node,
221 mpc52xx_fec_adjust_link, 0, 0);
222 if (!priv->phydev) {
223 dev_err(&dev->dev, "of_phy_connect failed\n");
224 return -ENODEV;
225 }
226 phy_start(priv->phydev);
227 }
228
229 if (request_irq(dev->irq, &mpc52xx_fec_interrupt, IRQF_SHARED,
230 DRIVER_NAME "_ctrl", dev)) {
231 dev_err(&dev->dev, "ctrl interrupt request failed\n");
232 goto free_phy;
233 }
234 if (request_irq(priv->r_irq, &mpc52xx_fec_rx_interrupt, 0,
235 DRIVER_NAME "_rx", dev)) {
236 dev_err(&dev->dev, "rx interrupt request failed\n");
237 goto free_ctrl_irq;
238 }
239 if (request_irq(priv->t_irq, &mpc52xx_fec_tx_interrupt, 0,
240 DRIVER_NAME "_tx", dev)) {
241 dev_err(&dev->dev, "tx interrupt request failed\n");
242 goto free_2irqs;
243 }
244
245 bcom_fec_rx_reset(priv->rx_dmatsk);
246 bcom_fec_tx_reset(priv->tx_dmatsk);
247
248 err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
249 if (err) {
250 dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
251 goto free_irqs;
252 }
253
254 bcom_enable(priv->rx_dmatsk);
255 bcom_enable(priv->tx_dmatsk);
256
257 mpc52xx_fec_start(dev);
258
259 netif_start_queue(dev);
260
261 return 0;
262
263 free_irqs:
264 free_irq(priv->t_irq, dev);
265 free_2irqs:
266 free_irq(priv->r_irq, dev);
267 free_ctrl_irq:
268 free_irq(dev->irq, dev);
269 free_phy:
270 if (priv->phydev) {
271 phy_stop(priv->phydev);
272 phy_disconnect(priv->phydev);
273 priv->phydev = NULL;
274 }
275
276 return err;
277 }
278
279 static int mpc52xx_fec_close(struct net_device *dev)
280 {
281 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
282
283 netif_stop_queue(dev);
284
285 mpc52xx_fec_stop(dev);
286
287 mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
288
289 free_irq(dev->irq, dev);
290 free_irq(priv->r_irq, dev);
291 free_irq(priv->t_irq, dev);
292
293 if (priv->phydev) {
294 /* power down phy */
295 phy_stop(priv->phydev);
296 phy_disconnect(priv->phydev);
297 priv->phydev = NULL;
298 }
299
300 return 0;
301 }
302
303 /* This will only be invoked if your driver is _not_ in XOFF state.
304 * What this means is that you need not check it, and that this
305 * invariant will hold if you make sure that the netif_*_queue()
306 * calls are done at the proper times.
307 */
308 static int mpc52xx_fec_start_xmit(struct sk_buff *skb, struct net_device *dev)
309 {
310 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
311 struct bcom_fec_bd *bd;
312 unsigned long flags;
313
314 if (bcom_queue_full(priv->tx_dmatsk)) {
315 if (net_ratelimit())
316 dev_err(&dev->dev, "transmit queue overrun\n");
317 return NETDEV_TX_BUSY;
318 }
319
320 spin_lock_irqsave(&priv->lock, flags);
321 dev->trans_start = jiffies;
322
323 bd = (struct bcom_fec_bd *)
324 bcom_prepare_next_buffer(priv->tx_dmatsk);
325
326 bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
327 bd->skb_pa = dma_map_single(dev->dev.parent, skb->data, skb->len,
328 DMA_TO_DEVICE);
329
330 bcom_submit_next_buffer(priv->tx_dmatsk, skb);
331
332 if (bcom_queue_full(priv->tx_dmatsk)) {
333 netif_stop_queue(dev);
334 }
335
336 spin_unlock_irqrestore(&priv->lock, flags);
337
338 return NETDEV_TX_OK;
339 }
340
341 #ifdef CONFIG_NET_POLL_CONTROLLER
342 static void mpc52xx_fec_poll_controller(struct net_device *dev)
343 {
344 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
345
346 disable_irq(priv->t_irq);
347 mpc52xx_fec_tx_interrupt(priv->t_irq, dev);
348 enable_irq(priv->t_irq);
349 disable_irq(priv->r_irq);
350 mpc52xx_fec_rx_interrupt(priv->r_irq, dev);
351 enable_irq(priv->r_irq);
352 }
353 #endif
354
355
356 /* This handles BestComm transmit task interrupts
357 */
358 static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
359 {
360 struct net_device *dev = dev_id;
361 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
362
363 spin_lock(&priv->lock);
364
365 while (bcom_buffer_done(priv->tx_dmatsk)) {
366 struct sk_buff *skb;
367 struct bcom_fec_bd *bd;
368 skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
369 (struct bcom_bd **)&bd);
370 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
371 DMA_TO_DEVICE);
372
373 dev_kfree_skb_irq(skb);
374 }
375
376 netif_wake_queue(dev);
377
378 spin_unlock(&priv->lock);
379
380 return IRQ_HANDLED;
381 }
382
383 static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
384 {
385 struct net_device *dev = dev_id;
386 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
387
388 while (bcom_buffer_done(priv->rx_dmatsk)) {
389 struct sk_buff *skb;
390 struct sk_buff *rskb;
391 struct bcom_fec_bd *bd;
392 u32 status;
393
394 rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
395 (struct bcom_bd **)&bd);
396 dma_unmap_single(dev->dev.parent, bd->skb_pa, rskb->len,
397 DMA_FROM_DEVICE);
398
399 /* Test for errors in received frame */
400 if (status & BCOM_FEC_RX_BD_ERRORS) {
401 /* Drop packet and reuse the buffer */
402 bd = (struct bcom_fec_bd *)
403 bcom_prepare_next_buffer(priv->rx_dmatsk);
404
405 bd->status = FEC_RX_BUFFER_SIZE;
406 bd->skb_pa = dma_map_single(dev->dev.parent,
407 rskb->data,
408 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
409
410 bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
411
412 dev->stats.rx_dropped++;
413
414 continue;
415 }
416
417 /* skbs are allocated on open, so now we allocate a new one,
418 * and remove the old (with the packet) */
419 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
420 if (skb) {
421 /* Process the received skb */
422 int length = status & BCOM_FEC_RX_BD_LEN_MASK;
423
424 skb_put(rskb, length - 4); /* length without CRC32 */
425
426 rskb->dev = dev;
427 rskb->protocol = eth_type_trans(rskb, dev);
428
429 netif_rx(rskb);
430 } else {
431 /* Can't get a new one : reuse the same & drop pkt */
432 dev_notice(&dev->dev, "Memory squeeze, dropping packet.\n");
433 dev->stats.rx_dropped++;
434
435 skb = rskb;
436 }
437
438 bd = (struct bcom_fec_bd *)
439 bcom_prepare_next_buffer(priv->rx_dmatsk);
440
441 bd->status = FEC_RX_BUFFER_SIZE;
442 bd->skb_pa = dma_map_single(dev->dev.parent, skb->data,
443 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
444
445 bcom_submit_next_buffer(priv->rx_dmatsk, skb);
446 }
447
448 return IRQ_HANDLED;
449 }
450
451 static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
452 {
453 struct net_device *dev = dev_id;
454 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
455 struct mpc52xx_fec __iomem *fec = priv->fec;
456 u32 ievent;
457
458 ievent = in_be32(&fec->ievent);
459
460 ievent &= ~FEC_IEVENT_MII; /* mii is handled separately */
461 if (!ievent)
462 return IRQ_NONE;
463
464 out_be32(&fec->ievent, ievent); /* clear pending events */
465
466 /* on fifo error, soft-reset fec */
467 if (ievent & (FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) {
468
469 if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR))
470 dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n");
471 if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
472 dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");
473
474 mpc52xx_fec_reset(dev);
475
476 netif_wake_queue(dev);
477 return IRQ_HANDLED;
478 }
479
480 if (ievent & ~FEC_IEVENT_TFINT)
481 dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
482
483 return IRQ_HANDLED;
484 }
485
486 /*
487 * Get the current statistics.
488 * This may be called with the card open or closed.
489 */
490 static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
491 {
492 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
493 struct net_device_stats *stats = &dev->stats;
494 struct mpc52xx_fec __iomem *fec = priv->fec;
495
496 stats->rx_bytes = in_be32(&fec->rmon_r_octets);
497 stats->rx_packets = in_be32(&fec->rmon_r_packets);
498 stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
499 in_be32(&fec->rmon_r_undersize) +
500 in_be32(&fec->rmon_r_oversize) +
501 in_be32(&fec->rmon_r_frag) +
502 in_be32(&fec->rmon_r_jab);
503
504 stats->tx_bytes = in_be32(&fec->rmon_t_octets);
505 stats->tx_packets = in_be32(&fec->rmon_t_packets);
506 stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
507 in_be32(&fec->rmon_t_undersize) +
508 in_be32(&fec->rmon_t_oversize) +
509 in_be32(&fec->rmon_t_frag) +
510 in_be32(&fec->rmon_t_jab);
511
512 stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
513 stats->collisions = in_be32(&fec->rmon_t_col);
514
515 /* detailed rx_errors: */
516 stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
517 + in_be32(&fec->rmon_r_oversize)
518 + in_be32(&fec->rmon_r_frag)
519 + in_be32(&fec->rmon_r_jab);
520 stats->rx_over_errors = in_be32(&fec->r_macerr);
521 stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
522 stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
523 stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
524 stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);
525
526 /* detailed tx_errors: */
527 stats->tx_aborted_errors = 0;
528 stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
529 stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
530 stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
531 stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);
532
533 return stats;
534 }
535
536 /*
537 * Read MIB counters in order to reset them,
538 * then zero all the stats fields in memory
539 */
540 static void mpc52xx_fec_reset_stats(struct net_device *dev)
541 {
542 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
543 struct mpc52xx_fec __iomem *fec = priv->fec;
544
545 out_be32(&fec->mib_control, FEC_MIB_DISABLE);
546 memset_io(&fec->rmon_t_drop, 0,
547 offsetof(struct mpc52xx_fec, reserved10) -
548 offsetof(struct mpc52xx_fec, rmon_t_drop));
549 out_be32(&fec->mib_control, 0);
550
551 memset(&dev->stats, 0, sizeof(dev->stats));
552 }
553
554 /*
555 * Set or clear the multicast filter for this adaptor.
556 */
557 static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
558 {
559 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
560 struct mpc52xx_fec __iomem *fec = priv->fec;
561 u32 rx_control;
562
563 rx_control = in_be32(&fec->r_cntrl);
564
565 if (dev->flags & IFF_PROMISC) {
566 rx_control |= FEC_RCNTRL_PROM;
567 out_be32(&fec->r_cntrl, rx_control);
568 } else {
569 rx_control &= ~FEC_RCNTRL_PROM;
570 out_be32(&fec->r_cntrl, rx_control);
571
572 if (dev->flags & IFF_ALLMULTI) {
573 out_be32(&fec->gaddr1, 0xffffffff);
574 out_be32(&fec->gaddr2, 0xffffffff);
575 } else {
576 u32 crc;
577 int i;
578 struct dev_mc_list *dmi;
579 u32 gaddr1 = 0x00000000;
580 u32 gaddr2 = 0x00000000;
581
582 dmi = dev->mc_list;
583 for (i=0; i<dev->mc_count; i++) {
584 crc = ether_crc_le(6, dmi->dmi_addr) >> 26;
585 if (crc >= 32)
586 gaddr1 |= 1 << (crc-32);
587 else
588 gaddr2 |= 1 << crc;
589 dmi = dmi->next;
590 }
591 out_be32(&fec->gaddr1, gaddr1);
592 out_be32(&fec->gaddr2, gaddr2);
593 }
594 }
595 }
596
597 /**
598 * mpc52xx_fec_hw_init
599 * @dev: network device
600 *
601 * Setup various hardware setting, only needed once on start
602 */
603 static void mpc52xx_fec_hw_init(struct net_device *dev)
604 {
605 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
606 struct mpc52xx_fec __iomem *fec = priv->fec;
607 int i;
608
609 /* Whack a reset. We should wait for this. */
610 out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
611 for (i = 0; i < FEC_RESET_DELAY; ++i) {
612 if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
613 break;
614 udelay(1);
615 }
616 if (i == FEC_RESET_DELAY)
617 dev_err(&dev->dev, "FEC Reset timeout!\n");
618
619 /* set pause to 0x20 frames */
620 out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);
621
622 /* high service request will be deasserted when there's < 7 bytes in fifo
623 * low service request will be deasserted when there's < 4*7 bytes in fifo
624 */
625 out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
626 out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
627
628 /* alarm when <= x bytes in FIFO */
629 out_be32(&fec->rfifo_alarm, 0x0000030c);
630 out_be32(&fec->tfifo_alarm, 0x00000100);
631
632 /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
633 out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);
634
635 /* enable crc generation */
636 out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
637 out_be32(&fec->iaddr1, 0x00000000); /* No individual filter */
638 out_be32(&fec->iaddr2, 0x00000000); /* No individual filter */
639
640 /* set phy speed.
641 * this can't be done in phy driver, since it needs to be called
642 * before fec stuff (even on resume) */
643 out_be32(&fec->mii_speed, priv->mdio_speed);
644 }
645
646 /**
647 * mpc52xx_fec_start
648 * @dev: network device
649 *
650 * This function is called to start or restart the FEC during a link
651 * change. This happens on fifo errors or when switching between half
652 * and full duplex.
653 */
654 static void mpc52xx_fec_start(struct net_device *dev)
655 {
656 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
657 struct mpc52xx_fec __iomem *fec = priv->fec;
658 u32 rcntrl;
659 u32 tcntrl;
660 u32 tmp;
661
662 /* clear sticky error bits */
663 tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
664 out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
665 out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);
666
667 /* FIFOs will reset on mpc52xx_fec_enable */
668 out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);
669
670 /* Set station address. */
671 mpc52xx_fec_set_paddr(dev, dev->dev_addr);
672
673 mpc52xx_fec_set_multicast_list(dev);
674
675 /* set max frame len, enable flow control, select mii mode */
676 rcntrl = FEC_RX_BUFFER_SIZE << 16; /* max frame length */
677 rcntrl |= FEC_RCNTRL_FCE;
678
679 if (!priv->seven_wire_mode)
680 rcntrl |= FEC_RCNTRL_MII_MODE;
681
682 if (priv->duplex == DUPLEX_FULL)
683 tcntrl = FEC_TCNTRL_FDEN; /* FD enable */
684 else {
685 rcntrl |= FEC_RCNTRL_DRT; /* disable Rx on Tx (HD) */
686 tcntrl = 0;
687 }
688 out_be32(&fec->r_cntrl, rcntrl);
689 out_be32(&fec->x_cntrl, tcntrl);
690
691 /* Clear any outstanding interrupt. */
692 out_be32(&fec->ievent, 0xffffffff);
693
694 /* Enable interrupts we wish to service. */
695 out_be32(&fec->imask, FEC_IMASK_ENABLE);
696
697 /* And last, enable the transmit and receive processing. */
698 out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
699 out_be32(&fec->r_des_active, 0x01000000);
700 }
701
702 /**
703 * mpc52xx_fec_stop
704 * @dev: network device
705 *
706 * stop all activity on fec and empty dma buffers
707 */
708 static void mpc52xx_fec_stop(struct net_device *dev)
709 {
710 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
711 struct mpc52xx_fec __iomem *fec = priv->fec;
712 unsigned long timeout;
713
714 /* disable all interrupts */
715 out_be32(&fec->imask, 0);
716
717 /* Disable the rx task. */
718 bcom_disable(priv->rx_dmatsk);
719
720 /* Wait for tx queue to drain, but only if we're in process context */
721 if (!in_interrupt()) {
722 timeout = jiffies + msecs_to_jiffies(2000);
723 while (time_before(jiffies, timeout) &&
724 !bcom_queue_empty(priv->tx_dmatsk))
725 msleep(100);
726
727 if (time_after_eq(jiffies, timeout))
728 dev_err(&dev->dev, "queues didn't drain\n");
729 #if 1
730 if (time_after_eq(jiffies, timeout)) {
731 dev_err(&dev->dev, " tx: index: %i, outdex: %i\n",
732 priv->tx_dmatsk->index,
733 priv->tx_dmatsk->outdex);
734 dev_err(&dev->dev, " rx: index: %i, outdex: %i\n",
735 priv->rx_dmatsk->index,
736 priv->rx_dmatsk->outdex);
737 }
738 #endif
739 }
740
741 bcom_disable(priv->tx_dmatsk);
742
743 /* Stop FEC */
744 out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
745 }
746
747 /* reset fec and bestcomm tasks */
748 static void mpc52xx_fec_reset(struct net_device *dev)
749 {
750 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
751 struct mpc52xx_fec __iomem *fec = priv->fec;
752
753 mpc52xx_fec_stop(dev);
754
755 out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
756 out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);
757
758 mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
759
760 mpc52xx_fec_hw_init(dev);
761
762 if (priv->phydev) {
763 phy_stop(priv->phydev);
764 phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
765 phy_start(priv->phydev);
766 }
767
768 bcom_fec_rx_reset(priv->rx_dmatsk);
769 bcom_fec_tx_reset(priv->tx_dmatsk);
770
771 mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
772
773 bcom_enable(priv->rx_dmatsk);
774 bcom_enable(priv->tx_dmatsk);
775
776 mpc52xx_fec_start(dev);
777 }
778
779
780 /* ethtool interface */
781 static void mpc52xx_fec_get_drvinfo(struct net_device *dev,
782 struct ethtool_drvinfo *info)
783 {
784 strcpy(info->driver, DRIVER_NAME);
785 }
786
787 static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
788 {
789 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
790
791 if (!priv->phydev)
792 return -ENODEV;
793
794 return phy_ethtool_gset(priv->phydev, cmd);
795 }
796
797 static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
798 {
799 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
800
801 if (!priv->phydev)
802 return -ENODEV;
803
804 return phy_ethtool_sset(priv->phydev, cmd);
805 }
806
807 static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
808 {
809 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
810 return priv->msg_enable;
811 }
812
813 static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
814 {
815 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
816 priv->msg_enable = level;
817 }
818
819 static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
820 .get_drvinfo = mpc52xx_fec_get_drvinfo,
821 .get_settings = mpc52xx_fec_get_settings,
822 .set_settings = mpc52xx_fec_set_settings,
823 .get_link = ethtool_op_get_link,
824 .get_msglevel = mpc52xx_fec_get_msglevel,
825 .set_msglevel = mpc52xx_fec_set_msglevel,
826 };
827
828
829 static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
830 {
831 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
832
833 if (!priv->phydev)
834 return -ENOTSUPP;
835
836 return phy_mii_ioctl(priv->phydev, if_mii(rq), cmd);
837 }
838
839 static const struct net_device_ops mpc52xx_fec_netdev_ops = {
840 .ndo_open = mpc52xx_fec_open,
841 .ndo_stop = mpc52xx_fec_close,
842 .ndo_start_xmit = mpc52xx_fec_start_xmit,
843 .ndo_set_multicast_list = mpc52xx_fec_set_multicast_list,
844 .ndo_set_mac_address = mpc52xx_fec_set_mac_address,
845 .ndo_validate_addr = eth_validate_addr,
846 .ndo_do_ioctl = mpc52xx_fec_ioctl,
847 .ndo_change_mtu = eth_change_mtu,
848 .ndo_tx_timeout = mpc52xx_fec_tx_timeout,
849 .ndo_get_stats = mpc52xx_fec_get_stats,
850 #ifdef CONFIG_NET_POLL_CONTROLLER
851 .ndo_poll_controller = mpc52xx_fec_poll_controller,
852 #endif
853 };
854
855 /* ======================================================================== */
856 /* OF Driver */
857 /* ======================================================================== */
858
859 static int __devinit
860 mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
861 {
862 int rv;
863 struct net_device *ndev;
864 struct mpc52xx_fec_priv *priv = NULL;
865 struct resource mem;
866 const u32 *prop;
867 int prop_size;
868
869 phys_addr_t rx_fifo;
870 phys_addr_t tx_fifo;
871
872 /* Get the ether ndev & it's private zone */
873 ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
874 if (!ndev)
875 return -ENOMEM;
876
877 priv = netdev_priv(ndev);
878 priv->ndev = ndev;
879
880 /* Reserve FEC control zone */
881 rv = of_address_to_resource(op->node, 0, &mem);
882 if (rv) {
883 printk(KERN_ERR DRIVER_NAME ": "
884 "Error while parsing device node resource\n" );
885 return rv;
886 }
887 if ((mem.end - mem.start + 1) < sizeof(struct mpc52xx_fec)) {
888 printk(KERN_ERR DRIVER_NAME
889 " - invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
890 (unsigned long)(mem.end - mem.start + 1), sizeof(struct mpc52xx_fec));
891 return -EINVAL;
892 }
893
894 if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec), DRIVER_NAME))
895 return -EBUSY;
896
897 /* Init ether ndev with what we have */
898 ndev->netdev_ops = &mpc52xx_fec_netdev_ops;
899 ndev->ethtool_ops = &mpc52xx_fec_ethtool_ops;
900 ndev->watchdog_timeo = FEC_WATCHDOG_TIMEOUT;
901 ndev->base_addr = mem.start;
902 SET_NETDEV_DEV(ndev, &op->dev);
903
904 spin_lock_init(&priv->lock);
905
906 /* ioremap the zones */
907 priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));
908
909 if (!priv->fec) {
910 rv = -ENOMEM;
911 goto probe_error;
912 }
913
914 /* Bestcomm init */
915 rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
916 tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);
917
918 priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
919 priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);
920
921 if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
922 printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
923 rv = -ENOMEM;
924 goto probe_error;
925 }
926
927 /* Get the IRQ we need one by one */
928 /* Control */
929 ndev->irq = irq_of_parse_and_map(op->node, 0);
930
931 /* RX */
932 priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);
933
934 /* TX */
935 priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);
936
937 /* MAC address init */
938 if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
939 memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
940 else
941 mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);
942
943 priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
944
945 /*
946 * Link mode configuration
947 */
948
949 /* Start with safe defaults for link connection */
950 priv->speed = 100;
951 priv->duplex = DUPLEX_HALF;
952 priv->mdio_speed = ((mpc5xxx_get_bus_frequency(op->node) >> 20) / 5) << 1;
953
954 /* The current speed preconfigures the speed of the MII link */
955 prop = of_get_property(op->node, "current-speed", &prop_size);
956 if (prop && (prop_size >= sizeof(u32) * 2)) {
957 priv->speed = prop[0];
958 priv->duplex = prop[1] ? DUPLEX_FULL : DUPLEX_HALF;
959 }
960
961 /* If there is a phy handle, then get the PHY node */
962 priv->phy_node = of_parse_phandle(op->node, "phy-handle", 0);
963
964 /* the 7-wire property means don't use MII mode */
965 if (of_find_property(op->node, "fsl,7-wire-mode", NULL)) {
966 priv->seven_wire_mode = 1;
967 dev_info(&ndev->dev, "using 7-wire PHY mode\n");
968 }
969
970 /* Hardware init */
971 mpc52xx_fec_hw_init(ndev);
972 mpc52xx_fec_reset_stats(ndev);
973
974 rv = register_netdev(ndev);
975 if (rv < 0)
976 goto probe_error;
977
978 /* We're done ! */
979 dev_set_drvdata(&op->dev, ndev);
980
981 return 0;
982
983
984 /* Error handling - free everything that might be allocated */
985 probe_error:
986
987 if (priv->phy_node)
988 of_node_put(priv->phy_node);
989 priv->phy_node = NULL;
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 if (priv->phy_node)
1020 of_node_put(priv->phy_node);
1021 priv->phy_node = NULL;
1022
1023 irq_dispose_mapping(ndev->irq);
1024
1025 bcom_fec_rx_release(priv->rx_dmatsk);
1026 bcom_fec_tx_release(priv->tx_dmatsk);
1027
1028 iounmap(priv->fec);
1029
1030 release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));
1031
1032 free_netdev(ndev);
1033
1034 dev_set_drvdata(&op->dev, NULL);
1035 return 0;
1036 }
1037
1038 #ifdef CONFIG_PM
1039 static int mpc52xx_fec_of_suspend(struct of_device *op, pm_message_t state)
1040 {
1041 struct net_device *dev = dev_get_drvdata(&op->dev);
1042
1043 if (netif_running(dev))
1044 mpc52xx_fec_close(dev);
1045
1046 return 0;
1047 }
1048
1049 static int mpc52xx_fec_of_resume(struct of_device *op)
1050 {
1051 struct net_device *dev = dev_get_drvdata(&op->dev);
1052
1053 mpc52xx_fec_hw_init(dev);
1054 mpc52xx_fec_reset_stats(dev);
1055
1056 if (netif_running(dev))
1057 mpc52xx_fec_open(dev);
1058
1059 return 0;
1060 }
1061 #endif
1062
1063 static struct of_device_id mpc52xx_fec_match[] = {
1064 { .compatible = "fsl,mpc5200b-fec", },
1065 { .compatible = "fsl,mpc5200-fec", },
1066 { .compatible = "mpc5200-fec", },
1067 { }
1068 };
1069
1070 MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);
1071
1072 static struct of_platform_driver mpc52xx_fec_driver = {
1073 .owner = THIS_MODULE,
1074 .name = DRIVER_NAME,
1075 .match_table = mpc52xx_fec_match,
1076 .probe = mpc52xx_fec_probe,
1077 .remove = mpc52xx_fec_remove,
1078 #ifdef CONFIG_PM
1079 .suspend = mpc52xx_fec_of_suspend,
1080 .resume = mpc52xx_fec_of_resume,
1081 #endif
1082 };
1083
1084
1085 /* ======================================================================== */
1086 /* Module */
1087 /* ======================================================================== */
1088
1089 static int __init
1090 mpc52xx_fec_init(void)
1091 {
1092 #ifdef CONFIG_FEC_MPC52xx_MDIO
1093 int ret;
1094 ret = of_register_platform_driver(&mpc52xx_fec_mdio_driver);
1095 if (ret) {
1096 printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
1097 return ret;
1098 }
1099 #endif
1100 return of_register_platform_driver(&mpc52xx_fec_driver);
1101 }
1102
1103 static void __exit
1104 mpc52xx_fec_exit(void)
1105 {
1106 of_unregister_platform_driver(&mpc52xx_fec_driver);
1107 #ifdef CONFIG_FEC_MPC52xx_MDIO
1108 of_unregister_platform_driver(&mpc52xx_fec_mdio_driver);
1109 #endif
1110 }
1111
1112
1113 module_init(mpc52xx_fec_init);
1114 module_exit(mpc52xx_fec_exit);
1115
1116 MODULE_LICENSE("GPL");
1117 MODULE_AUTHOR("Dale Farnsworth");
1118 MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");
1119
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