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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / net / ethernet / freescale / fec_mpc52xx.c
blob30745b56fe5d6d5d11193eb966699bf6aed55fc7
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/dma-mapping.h>
18 #include <linux/module.h>
19
20 #include <linux/kernel.h>
21 #include <linux/types.h>
22 #include <linux/spinlock.h>
23 #include <linux/slab.h>
24 #include <linux/errno.h>
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
27 #include <linux/crc32.h>
28 #include <linux/hardirq.h>
29 #include <linux/delay.h>
30 #include <linux/of_device.h>
31 #include <linux/of_mdio.h>
32 #include <linux/of_platform.h>
33
34 #include <linux/netdevice.h>
35 #include <linux/etherdevice.h>
36 #include <linux/ethtool.h>
37 #include <linux/skbuff.h>
38
39 #include <asm/io.h>
40 #include <asm/delay.h>
41 #include <asm/mpc52xx.h>
42
43 #include <sysdev/bestcomm/bestcomm.h>
44 #include <sysdev/bestcomm/fec.h>
45
46 #include "fec_mpc52xx.h"
47
48 #define DRIVER_NAME "mpc52xx-fec"
49
50 /* Private driver data structure */
51 struct mpc52xx_fec_priv {
52 struct net_device *ndev;
53 int duplex;
54 int speed;
55 int r_irq;
56 int t_irq;
57 struct mpc52xx_fec __iomem *fec;
58 struct bcom_task *rx_dmatsk;
59 struct bcom_task *tx_dmatsk;
60 spinlock_t lock;
61 int msg_enable;
62
63 /* MDIO link details */
64 unsigned int mdio_speed;
65 struct device_node *phy_node;
66 struct phy_device *phydev;
67 enum phy_state link;
68 int seven_wire_mode;
69 };
70
71
72 static irqreturn_t mpc52xx_fec_interrupt(int, void *);
73 static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *);
74 static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *);
75 static void mpc52xx_fec_stop(struct net_device *dev);
76 static void mpc52xx_fec_start(struct net_device *dev);
77 static void mpc52xx_fec_reset(struct net_device *dev);
78
79 static u8 mpc52xx_fec_mac_addr[6];
80 module_param_array_named(mac, mpc52xx_fec_mac_addr, byte, NULL, 0);
81 MODULE_PARM_DESC(mac, "six hex digits, ie. 0x1,0x2,0xc0,0x01,0xba,0xbe");
82
83 #define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \
84 NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP)
85 static int debug = -1; /* the above default */
86 module_param(debug, int, 0);
87 MODULE_PARM_DESC(debug, "debugging messages level");
88
89 static void mpc52xx_fec_tx_timeout(struct net_device *dev)
90 {
91 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
92 unsigned long flags;
93
94 dev_warn(&dev->dev, "transmit timed out\n");
95
96 spin_lock_irqsave(&priv->lock, flags);
97 mpc52xx_fec_reset(dev);
98 dev->stats.tx_errors++;
99 spin_unlock_irqrestore(&priv->lock, flags);
100
101 netif_wake_queue(dev);
102 }
103
104 static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac)
105 {
106 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
107 struct mpc52xx_fec __iomem *fec = priv->fec;
108
109 out_be32(&fec->paddr1, *(u32 *)(&mac[0]));
110 out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE);
111 }
112
113 static void mpc52xx_fec_get_paddr(struct net_device *dev, u8 *mac)
114 {
115 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
116 struct mpc52xx_fec __iomem *fec = priv->fec;
117
118 *(u32 *)(&mac[0]) = in_be32(&fec->paddr1);
119 *(u16 *)(&mac[4]) = in_be32(&fec->paddr2) >> 16;
120 }
121
122 static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr)
123 {
124 struct sockaddr *sock = addr;
125
126 memcpy(dev->dev_addr, sock->sa_data, dev->addr_len);
127
128 mpc52xx_fec_set_paddr(dev, sock->sa_data);
129 return 0;
130 }
131
132 static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s)
133 {
134 while (!bcom_queue_empty(s)) {
135 struct bcom_fec_bd *bd;
136 struct sk_buff *skb;
137
138 skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd);
139 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
140 DMA_FROM_DEVICE);
141 kfree_skb(skb);
142 }
143 }
144
145 static void
146 mpc52xx_fec_rx_submit(struct net_device *dev, struct sk_buff *rskb)
147 {
148 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
149 struct bcom_fec_bd *bd;
150
151 bd = (struct bcom_fec_bd *) bcom_prepare_next_buffer(priv->rx_dmatsk);
152 bd->status = FEC_RX_BUFFER_SIZE;
153 bd->skb_pa = dma_map_single(dev->dev.parent, rskb->data,
154 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
155 bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
156 }
157
158 static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
159 {
160 struct sk_buff *skb;
161
162 while (!bcom_queue_full(rxtsk)) {
163 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
164 if (!skb)
165 return -EAGAIN;
166
167 /* zero out the initial receive buffers to aid debugging */
168 memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
169 mpc52xx_fec_rx_submit(dev, skb);
170 }
171 return 0;
172 }
173
174 /* based on generic_adjust_link from fs_enet-main.c */
175 static void mpc52xx_fec_adjust_link(struct net_device *dev)
176 {
177 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
178 struct phy_device *phydev = priv->phydev;
179 int new_state = 0;
180
181 if (phydev->link != PHY_DOWN) {
182 if (phydev->duplex != priv->duplex) {
183 struct mpc52xx_fec __iomem *fec = priv->fec;
184 u32 rcntrl;
185 u32 tcntrl;
186
187 new_state = 1;
188 priv->duplex = phydev->duplex;
189
190 rcntrl = in_be32(&fec->r_cntrl);
191 tcntrl = in_be32(&fec->x_cntrl);
192
193 rcntrl &= ~FEC_RCNTRL_DRT;
194 tcntrl &= ~FEC_TCNTRL_FDEN;
195 if (phydev->duplex == DUPLEX_FULL)
196 tcntrl |= FEC_TCNTRL_FDEN; /* FD enable */
197 else
198 rcntrl |= FEC_RCNTRL_DRT; /* disable Rx on Tx (HD) */
199
200 out_be32(&fec->r_cntrl, rcntrl);
201 out_be32(&fec->x_cntrl, tcntrl);
202 }
203
204 if (phydev->speed != priv->speed) {
205 new_state = 1;
206 priv->speed = phydev->speed;
207 }
208
209 if (priv->link == PHY_DOWN) {
210 new_state = 1;
211 priv->link = phydev->link;
212 }
213
214 } else if (priv->link) {
215 new_state = 1;
216 priv->link = PHY_DOWN;
217 priv->speed = 0;
218 priv->duplex = -1;
219 }
220
221 if (new_state && netif_msg_link(priv))
222 phy_print_status(phydev);
223 }
224
225 static int mpc52xx_fec_open(struct net_device *dev)
226 {
227 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
228 int err = -EBUSY;
229
230 if (priv->phy_node) {
231 priv->phydev = of_phy_connect(priv->ndev, priv->phy_node,
232 mpc52xx_fec_adjust_link, 0, 0);
233 if (!priv->phydev) {
234 dev_err(&dev->dev, "of_phy_connect failed\n");
235 return -ENODEV;
236 }
237 phy_start(priv->phydev);
238 }
239
240 if (request_irq(dev->irq, mpc52xx_fec_interrupt, IRQF_SHARED,
241 DRIVER_NAME "_ctrl", dev)) {
242 dev_err(&dev->dev, "ctrl interrupt request failed\n");
243 goto free_phy;
244 }
245 if (request_irq(priv->r_irq, mpc52xx_fec_rx_interrupt, 0,
246 DRIVER_NAME "_rx", dev)) {
247 dev_err(&dev->dev, "rx interrupt request failed\n");
248 goto free_ctrl_irq;
249 }
250 if (request_irq(priv->t_irq, mpc52xx_fec_tx_interrupt, 0,
251 DRIVER_NAME "_tx", dev)) {
252 dev_err(&dev->dev, "tx interrupt request failed\n");
253 goto free_2irqs;
254 }
255
256 bcom_fec_rx_reset(priv->rx_dmatsk);
257 bcom_fec_tx_reset(priv->tx_dmatsk);
258
259 err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
260 if (err) {
261 dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
262 goto free_irqs;
263 }
264
265 bcom_enable(priv->rx_dmatsk);
266 bcom_enable(priv->tx_dmatsk);
267
268 mpc52xx_fec_start(dev);
269
270 netif_start_queue(dev);
271
272 return 0;
273
274 free_irqs:
275 free_irq(priv->t_irq, dev);
276 free_2irqs:
277 free_irq(priv->r_irq, dev);
278 free_ctrl_irq:
279 free_irq(dev->irq, dev);
280 free_phy:
281 if (priv->phydev) {
282 phy_stop(priv->phydev);
283 phy_disconnect(priv->phydev);
284 priv->phydev = NULL;
285 }
286
287 return err;
288 }
289
290 static int mpc52xx_fec_close(struct net_device *dev)
291 {
292 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
293
294 netif_stop_queue(dev);
295
296 mpc52xx_fec_stop(dev);
297
298 mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
299
300 free_irq(dev->irq, dev);
301 free_irq(priv->r_irq, dev);
302 free_irq(priv->t_irq, dev);
303
304 if (priv->phydev) {
305 /* power down phy */
306 phy_stop(priv->phydev);
307 phy_disconnect(priv->phydev);
308 priv->phydev = NULL;
309 }
310
311 return 0;
312 }
313
314 /* This will only be invoked if your driver is _not_ in XOFF state.
315 * What this means is that you need not check it, and that this
316 * invariant will hold if you make sure that the netif_*_queue()
317 * calls are done at the proper times.
318 */
319 static int mpc52xx_fec_start_xmit(struct sk_buff *skb, struct net_device *dev)
320 {
321 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
322 struct bcom_fec_bd *bd;
323 unsigned long flags;
324
325 if (bcom_queue_full(priv->tx_dmatsk)) {
326 if (net_ratelimit())
327 dev_err(&dev->dev, "transmit queue overrun\n");
328 return NETDEV_TX_BUSY;
329 }
330
331 spin_lock_irqsave(&priv->lock, flags);
332
333 bd = (struct bcom_fec_bd *)
334 bcom_prepare_next_buffer(priv->tx_dmatsk);
335
336 bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
337 bd->skb_pa = dma_map_single(dev->dev.parent, skb->data, skb->len,
338 DMA_TO_DEVICE);
339
340 skb_tx_timestamp(skb);
341 bcom_submit_next_buffer(priv->tx_dmatsk, skb);
342 spin_unlock_irqrestore(&priv->lock, flags);
343
344 if (bcom_queue_full(priv->tx_dmatsk)) {
345 netif_stop_queue(dev);
346 }
347
348 return NETDEV_TX_OK;
349 }
350
351 #ifdef CONFIG_NET_POLL_CONTROLLER
352 static void mpc52xx_fec_poll_controller(struct net_device *dev)
353 {
354 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
355
356 disable_irq(priv->t_irq);
357 mpc52xx_fec_tx_interrupt(priv->t_irq, dev);
358 enable_irq(priv->t_irq);
359 disable_irq(priv->r_irq);
360 mpc52xx_fec_rx_interrupt(priv->r_irq, dev);
361 enable_irq(priv->r_irq);
362 }
363 #endif
364
365
366 /* This handles BestComm transmit task interrupts
367 */
368 static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
369 {
370 struct net_device *dev = dev_id;
371 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
372
373 spin_lock(&priv->lock);
374 while (bcom_buffer_done(priv->tx_dmatsk)) {
375 struct sk_buff *skb;
376 struct bcom_fec_bd *bd;
377 skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
378 (struct bcom_bd **)&bd);
379 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
380 DMA_TO_DEVICE);
381
382 dev_kfree_skb_irq(skb);
383 }
384 spin_unlock(&priv->lock);
385
386 netif_wake_queue(dev);
387
388 return IRQ_HANDLED;
389 }
390
391 static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
392 {
393 struct net_device *dev = dev_id;
394 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
395 struct sk_buff *rskb; /* received sk_buff */
396 struct sk_buff *skb; /* new sk_buff to enqueue in its place */
397 struct bcom_fec_bd *bd;
398 u32 status, physaddr;
399 int length;
400
401 spin_lock(&priv->lock);
402
403 while (bcom_buffer_done(priv->rx_dmatsk)) {
404
405 rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
406 (struct bcom_bd **)&bd);
407 physaddr = bd->skb_pa;
408
409 /* Test for errors in received frame */
410 if (status & BCOM_FEC_RX_BD_ERRORS) {
411 /* Drop packet and reuse the buffer */
412 mpc52xx_fec_rx_submit(dev, rskb);
413 dev->stats.rx_dropped++;
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 /* Can't get a new one : reuse the same & drop pkt */
422 dev_notice(&dev->dev, "Low memory - dropped packet.\n");
423 mpc52xx_fec_rx_submit(dev, rskb);
424 dev->stats.rx_dropped++;
425 continue;
426 }
427
428 /* Enqueue the new sk_buff back on the hardware */
429 mpc52xx_fec_rx_submit(dev, skb);
430
431 /* Process the received skb - Drop the spin lock while
432 * calling into the network stack */
433 spin_unlock(&priv->lock);
434
435 dma_unmap_single(dev->dev.parent, physaddr, rskb->len,
436 DMA_FROM_DEVICE);
437 length = status & BCOM_FEC_RX_BD_LEN_MASK;
438 skb_put(rskb, length - 4); /* length without CRC32 */
439 rskb->protocol = eth_type_trans(rskb, dev);
440 if (!skb_defer_rx_timestamp(skb))
441 netif_rx(rskb);
442
443 spin_lock(&priv->lock);
444 }
445
446 spin_unlock(&priv->lock);
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 spin_lock(&priv->lock);
475 mpc52xx_fec_reset(dev);
476 spin_unlock(&priv->lock);
477
478 return IRQ_HANDLED;
479 }
480
481 if (ievent & ~FEC_IEVENT_TFINT)
482 dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
483
484 return IRQ_HANDLED;
485 }
486
487 /*
488 * Get the current statistics.
489 * This may be called with the card open or closed.
490 */
491 static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
492 {
493 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
494 struct net_device_stats *stats = &dev->stats;
495 struct mpc52xx_fec __iomem *fec = priv->fec;
496
497 stats->rx_bytes = in_be32(&fec->rmon_r_octets);
498 stats->rx_packets = in_be32(&fec->rmon_r_packets);
499 stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
500 in_be32(&fec->rmon_r_undersize) +
501 in_be32(&fec->rmon_r_oversize) +
502 in_be32(&fec->rmon_r_frag) +
503 in_be32(&fec->rmon_r_jab);
504
505 stats->tx_bytes = in_be32(&fec->rmon_t_octets);
506 stats->tx_packets = in_be32(&fec->rmon_t_packets);
507 stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
508 in_be32(&fec->rmon_t_undersize) +
509 in_be32(&fec->rmon_t_oversize) +
510 in_be32(&fec->rmon_t_frag) +
511 in_be32(&fec->rmon_t_jab);
512
513 stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
514 stats->collisions = in_be32(&fec->rmon_t_col);
515
516 /* detailed rx_errors: */
517 stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
518 + in_be32(&fec->rmon_r_oversize)
519 + in_be32(&fec->rmon_r_frag)
520 + in_be32(&fec->rmon_r_jab);
521 stats->rx_over_errors = in_be32(&fec->r_macerr);
522 stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
523 stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
524 stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
525 stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);
526
527 /* detailed tx_errors: */
528 stats->tx_aborted_errors = 0;
529 stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
530 stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
531 stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
532 stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);
533
534 return stats;
535 }
536
537 /*
538 * Read MIB counters in order to reset them,
539 * then zero all the stats fields in memory
540 */
541 static void mpc52xx_fec_reset_stats(struct net_device *dev)
542 {
543 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
544 struct mpc52xx_fec __iomem *fec = priv->fec;
545
546 out_be32(&fec->mib_control, FEC_MIB_DISABLE);
547 memset_io(&fec->rmon_t_drop, 0,
548 offsetof(struct mpc52xx_fec, reserved10) -
549 offsetof(struct mpc52xx_fec, rmon_t_drop));
550 out_be32(&fec->mib_control, 0);
551
552 memset(&dev->stats, 0, sizeof(dev->stats));
553 }
554
555 /*
556 * Set or clear the multicast filter for this adaptor.
557 */
558 static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
559 {
560 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
561 struct mpc52xx_fec __iomem *fec = priv->fec;
562 u32 rx_control;
563
564 rx_control = in_be32(&fec->r_cntrl);
565
566 if (dev->flags & IFF_PROMISC) {
567 rx_control |= FEC_RCNTRL_PROM;
568 out_be32(&fec->r_cntrl, rx_control);
569 } else {
570 rx_control &= ~FEC_RCNTRL_PROM;
571 out_be32(&fec->r_cntrl, rx_control);
572
573 if (dev->flags & IFF_ALLMULTI) {
574 out_be32(&fec->gaddr1, 0xffffffff);
575 out_be32(&fec->gaddr2, 0xffffffff);
576 } else {
577 u32 crc;
578 struct netdev_hw_addr *ha;
579 u32 gaddr1 = 0x00000000;
580 u32 gaddr2 = 0x00000000;
581
582 netdev_for_each_mc_addr(ha, dev) {
583 crc = ether_crc_le(6, ha->addr) >> 26;
584 if (crc >= 32)
585 gaddr1 |= 1 << (crc-32);
586 else
587 gaddr2 |= 1 << crc;
588 }
589 out_be32(&fec->gaddr1, gaddr1);
590 out_be32(&fec->gaddr2, gaddr2);
591 }
592 }
593 }
594
595 /**
596 * mpc52xx_fec_hw_init
597 * @dev: network device
598 *
599 * Setup various hardware setting, only needed once on start
600 */
601 static void mpc52xx_fec_hw_init(struct net_device *dev)
602 {
603 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
604 struct mpc52xx_fec __iomem *fec = priv->fec;
605 int i;
606
607 /* Whack a reset. We should wait for this. */
608 out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
609 for (i = 0; i < FEC_RESET_DELAY; ++i) {
610 if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
611 break;
612 udelay(1);
613 }
614 if (i == FEC_RESET_DELAY)
615 dev_err(&dev->dev, "FEC Reset timeout!\n");
616
617 /* set pause to 0x20 frames */
618 out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);
619
620 /* high service request will be deasserted when there's < 7 bytes in fifo
621 * low service request will be deasserted when there's < 4*7 bytes in fifo
622 */
623 out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
624 out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
625
626 /* alarm when <= x bytes in FIFO */
627 out_be32(&fec->rfifo_alarm, 0x0000030c);
628 out_be32(&fec->tfifo_alarm, 0x00000100);
629
630 /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
631 out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);
632
633 /* enable crc generation */
634 out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
635 out_be32(&fec->iaddr1, 0x00000000); /* No individual filter */
636 out_be32(&fec->iaddr2, 0x00000000); /* No individual filter */
637
638 /* set phy speed.
639 * this can't be done in phy driver, since it needs to be called
640 * before fec stuff (even on resume) */
641 out_be32(&fec->mii_speed, priv->mdio_speed);
642 }
643
644 /**
645 * mpc52xx_fec_start
646 * @dev: network device
647 *
648 * This function is called to start or restart the FEC during a link
649 * change. This happens on fifo errors or when switching between half
650 * and full duplex.
651 */
652 static void mpc52xx_fec_start(struct net_device *dev)
653 {
654 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
655 struct mpc52xx_fec __iomem *fec = priv->fec;
656 u32 rcntrl;
657 u32 tcntrl;
658 u32 tmp;
659
660 /* clear sticky error bits */
661 tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
662 out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
663 out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);
664
665 /* FIFOs will reset on mpc52xx_fec_enable */
666 out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);
667
668 /* Set station address. */
669 mpc52xx_fec_set_paddr(dev, dev->dev_addr);
670
671 mpc52xx_fec_set_multicast_list(dev);
672
673 /* set max frame len, enable flow control, select mii mode */
674 rcntrl = FEC_RX_BUFFER_SIZE << 16; /* max frame length */
675 rcntrl |= FEC_RCNTRL_FCE;
676
677 if (!priv->seven_wire_mode)
678 rcntrl |= FEC_RCNTRL_MII_MODE;
679
680 if (priv->duplex == DUPLEX_FULL)
681 tcntrl = FEC_TCNTRL_FDEN; /* FD enable */
682 else {
683 rcntrl |= FEC_RCNTRL_DRT; /* disable Rx on Tx (HD) */
684 tcntrl = 0;
685 }
686 out_be32(&fec->r_cntrl, rcntrl);
687 out_be32(&fec->x_cntrl, tcntrl);
688
689 /* Clear any outstanding interrupt. */
690 out_be32(&fec->ievent, 0xffffffff);
691
692 /* Enable interrupts we wish to service. */
693 out_be32(&fec->imask, FEC_IMASK_ENABLE);
694
695 /* And last, enable the transmit and receive processing. */
696 out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
697 out_be32(&fec->r_des_active, 0x01000000);
698 }
699
700 /**
701 * mpc52xx_fec_stop
702 * @dev: network device
703 *
704 * stop all activity on fec and empty dma buffers
705 */
706 static void mpc52xx_fec_stop(struct net_device *dev)
707 {
708 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
709 struct mpc52xx_fec __iomem *fec = priv->fec;
710 unsigned long timeout;
711
712 /* disable all interrupts */
713 out_be32(&fec->imask, 0);
714
715 /* Disable the rx task. */
716 bcom_disable(priv->rx_dmatsk);
717
718 /* Wait for tx queue to drain, but only if we're in process context */
719 if (!in_interrupt()) {
720 timeout = jiffies + msecs_to_jiffies(2000);
721 while (time_before(jiffies, timeout) &&
722 !bcom_queue_empty(priv->tx_dmatsk))
723 msleep(100);
724
725 if (time_after_eq(jiffies, timeout))
726 dev_err(&dev->dev, "queues didn't drain\n");
727 #if 1
728 if (time_after_eq(jiffies, timeout)) {
729 dev_err(&dev->dev, " tx: index: %i, outdex: %i\n",
730 priv->tx_dmatsk->index,
731 priv->tx_dmatsk->outdex);
732 dev_err(&dev->dev, " rx: index: %i, outdex: %i\n",
733 priv->rx_dmatsk->index,
734 priv->rx_dmatsk->outdex);
735 }
736 #endif
737 }
738
739 bcom_disable(priv->tx_dmatsk);
740
741 /* Stop FEC */
742 out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
743 }
744
745 /* reset fec and bestcomm tasks */
746 static void mpc52xx_fec_reset(struct net_device *dev)
747 {
748 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
749 struct mpc52xx_fec __iomem *fec = priv->fec;
750
751 mpc52xx_fec_stop(dev);
752
753 out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
754 out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);
755
756 mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
757
758 mpc52xx_fec_hw_init(dev);
759
760 bcom_fec_rx_reset(priv->rx_dmatsk);
761 bcom_fec_tx_reset(priv->tx_dmatsk);
762
763 mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
764
765 bcom_enable(priv->rx_dmatsk);
766 bcom_enable(priv->tx_dmatsk);
767
768 mpc52xx_fec_start(dev);
769
770 netif_wake_queue(dev);
771 }
772
773
774 /* ethtool interface */
775
776 static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
777 {
778 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
779
780 if (!priv->phydev)
781 return -ENODEV;
782
783 return phy_ethtool_gset(priv->phydev, cmd);
784 }
785
786 static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
787 {
788 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
789
790 if (!priv->phydev)
791 return -ENODEV;
792
793 return phy_ethtool_sset(priv->phydev, cmd);
794 }
795
796 static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
797 {
798 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
799 return priv->msg_enable;
800 }
801
802 static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
803 {
804 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
805 priv->msg_enable = level;
806 }
807
808 static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
809 .get_settings = mpc52xx_fec_get_settings,
810 .set_settings = mpc52xx_fec_set_settings,
811 .get_link = ethtool_op_get_link,
812 .get_msglevel = mpc52xx_fec_get_msglevel,
813 .set_msglevel = mpc52xx_fec_set_msglevel,
814 };
815
816
817 static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
818 {
819 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
820
821 if (!priv->phydev)
822 return -ENOTSUPP;
823
824 return phy_mii_ioctl(priv->phydev, rq, cmd);
825 }
826
827 static const struct net_device_ops mpc52xx_fec_netdev_ops = {
828 .ndo_open = mpc52xx_fec_open,
829 .ndo_stop = mpc52xx_fec_close,
830 .ndo_start_xmit = mpc52xx_fec_start_xmit,
831 .ndo_set_rx_mode = mpc52xx_fec_set_multicast_list,
832 .ndo_set_mac_address = mpc52xx_fec_set_mac_address,
833 .ndo_validate_addr = eth_validate_addr,
834 .ndo_do_ioctl = mpc52xx_fec_ioctl,
835 .ndo_change_mtu = eth_change_mtu,
836 .ndo_tx_timeout = mpc52xx_fec_tx_timeout,
837 .ndo_get_stats = mpc52xx_fec_get_stats,
838 #ifdef CONFIG_NET_POLL_CONTROLLER
839 .ndo_poll_controller = mpc52xx_fec_poll_controller,
840 #endif
841 };
842
843 /* ======================================================================== */
844 /* OF Driver */
845 /* ======================================================================== */
846
847 static int __devinit mpc52xx_fec_probe(struct platform_device *op)
848 {
849 int rv;
850 struct net_device *ndev;
851 struct mpc52xx_fec_priv *priv = NULL;
852 struct resource mem;
853 const u32 *prop;
854 int prop_size;
855
856 phys_addr_t rx_fifo;
857 phys_addr_t tx_fifo;
858
859 /* Get the ether ndev & it's private zone */
860 ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
861 if (!ndev)
862 return -ENOMEM;
863
864 priv = netdev_priv(ndev);
865 priv->ndev = ndev;
866
867 /* Reserve FEC control zone */
868 rv = of_address_to_resource(op->dev.of_node, 0, &mem);
869 if (rv) {
870 printk(KERN_ERR DRIVER_NAME ": "
871 "Error while parsing device node resource\n" );
872 goto err_netdev;
873 }
874 if (resource_size(&mem) < sizeof(struct mpc52xx_fec)) {
875 printk(KERN_ERR DRIVER_NAME
876 " - invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
877 (unsigned long)resource_size(&mem),
878 sizeof(struct mpc52xx_fec));
879 rv = -EINVAL;
880 goto err_netdev;
881 }
882
883 if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec),
884 DRIVER_NAME)) {
885 rv = -EBUSY;
886 goto err_netdev;
887 }
888
889 /* Init ether ndev with what we have */
890 ndev->netdev_ops = &mpc52xx_fec_netdev_ops;
891 ndev->ethtool_ops = &mpc52xx_fec_ethtool_ops;
892 ndev->watchdog_timeo = FEC_WATCHDOG_TIMEOUT;
893 ndev->base_addr = mem.start;
894 SET_NETDEV_DEV(ndev, &op->dev);
895
896 spin_lock_init(&priv->lock);
897
898 /* ioremap the zones */
899 priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));
900
901 if (!priv->fec) {
902 rv = -ENOMEM;
903 goto err_mem_region;
904 }
905
906 /* Bestcomm init */
907 rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
908 tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);
909
910 priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
911 priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);
912
913 if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
914 printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
915 rv = -ENOMEM;
916 goto err_rx_tx_dmatsk;
917 }
918
919 /* Get the IRQ we need one by one */
920 /* Control */
921 ndev->irq = irq_of_parse_and_map(op->dev.of_node, 0);
922
923 /* RX */
924 priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);
925
926 /* TX */
927 priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);
928
929 /* MAC address init */
930 if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
931 memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
932 else
933 mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);
934
935 priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
936
937 /*
938 * Link mode configuration
939 */
940
941 /* Start with safe defaults for link connection */
942 priv->speed = 100;
943 priv->duplex = DUPLEX_HALF;
944 priv->mdio_speed = ((mpc5xxx_get_bus_frequency(op->dev.of_node) >> 20) / 5) << 1;
945
946 /* The current speed preconfigures the speed of the MII link */
947 prop = of_get_property(op->dev.of_node, "current-speed", &prop_size);
948 if (prop && (prop_size >= sizeof(u32) * 2)) {
949 priv->speed = prop[0];
950 priv->duplex = prop[1] ? DUPLEX_FULL : DUPLEX_HALF;
951 }
952
953 /* If there is a phy handle, then get the PHY node */
954 priv->phy_node = of_parse_phandle(op->dev.of_node, "phy-handle", 0);
955
956 /* the 7-wire property means don't use MII mode */
957 if (of_find_property(op->dev.of_node, "fsl,7-wire-mode", NULL)) {
958 priv->seven_wire_mode = 1;
959 dev_info(&ndev->dev, "using 7-wire PHY mode\n");
960 }
961
962 /* Hardware init */
963 mpc52xx_fec_hw_init(ndev);
964 mpc52xx_fec_reset_stats(ndev);
965
966 rv = register_netdev(ndev);
967 if (rv < 0)
968 goto err_node;
969
970 /* We're done ! */
971 dev_set_drvdata(&op->dev, ndev);
972
973 return 0;
974
975 err_node:
976 of_node_put(priv->phy_node);
977 irq_dispose_mapping(ndev->irq);
978 err_rx_tx_dmatsk:
979 if (priv->rx_dmatsk)
980 bcom_fec_rx_release(priv->rx_dmatsk);
981 if (priv->tx_dmatsk)
982 bcom_fec_tx_release(priv->tx_dmatsk);
983 iounmap(priv->fec);
984 err_mem_region:
985 release_mem_region(mem.start, sizeof(struct mpc52xx_fec));
986 err_netdev:
987 free_netdev(ndev);
988
989 return rv;
990 }
991
992 static int
993 mpc52xx_fec_remove(struct platform_device *op)
994 {
995 struct net_device *ndev;
996 struct mpc52xx_fec_priv *priv;
997
998 ndev = dev_get_drvdata(&op->dev);
999 priv = netdev_priv(ndev);
1000
1001 unregister_netdev(ndev);
1002
1003 if (priv->phy_node)
1004 of_node_put(priv->phy_node);
1005 priv->phy_node = NULL;
1006
1007 irq_dispose_mapping(ndev->irq);
1008
1009 bcom_fec_rx_release(priv->rx_dmatsk);
1010 bcom_fec_tx_release(priv->tx_dmatsk);
1011
1012 iounmap(priv->fec);
1013
1014 release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));
1015
1016 free_netdev(ndev);
1017
1018 dev_set_drvdata(&op->dev, NULL);
1019 return 0;
1020 }
1021
1022 #ifdef CONFIG_PM
1023 static int mpc52xx_fec_of_suspend(struct platform_device *op, pm_message_t state)
1024 {
1025 struct net_device *dev = dev_get_drvdata(&op->dev);
1026
1027 if (netif_running(dev))
1028 mpc52xx_fec_close(dev);
1029
1030 return 0;
1031 }
1032
1033 static int mpc52xx_fec_of_resume(struct platform_device *op)
1034 {
1035 struct net_device *dev = dev_get_drvdata(&op->dev);
1036
1037 mpc52xx_fec_hw_init(dev);
1038 mpc52xx_fec_reset_stats(dev);
1039
1040 if (netif_running(dev))
1041 mpc52xx_fec_open(dev);
1042
1043 return 0;
1044 }
1045 #endif
1046
1047 static struct of_device_id mpc52xx_fec_match[] = {
1048 { .compatible = "fsl,mpc5200b-fec", },
1049 { .compatible = "fsl,mpc5200-fec", },
1050 { .compatible = "mpc5200-fec", },
1051 { }
1052 };
1053
1054 MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);
1055
1056 static struct platform_driver mpc52xx_fec_driver = {
1057 .driver = {
1058 .name = DRIVER_NAME,
1059 .owner = THIS_MODULE,
1060 .of_match_table = mpc52xx_fec_match,
1061 },
1062 .probe = mpc52xx_fec_probe,
1063 .remove = mpc52xx_fec_remove,
1064 #ifdef CONFIG_PM
1065 .suspend = mpc52xx_fec_of_suspend,
1066 .resume = mpc52xx_fec_of_resume,
1067 #endif
1068 };
1069
1070
1071 /* ======================================================================== */
1072 /* Module */
1073 /* ======================================================================== */
1074
1075 static int __init
1076 mpc52xx_fec_init(void)
1077 {
1078 #ifdef CONFIG_FEC_MPC52xx_MDIO
1079 int ret;
1080 ret = platform_driver_register(&mpc52xx_fec_mdio_driver);
1081 if (ret) {
1082 printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
1083 return ret;
1084 }
1085 #endif
1086 return platform_driver_register(&mpc52xx_fec_driver);
1087 }
1088
1089 static void __exit
1090 mpc52xx_fec_exit(void)
1091 {
1092 platform_driver_unregister(&mpc52xx_fec_driver);
1093 #ifdef CONFIG_FEC_MPC52xx_MDIO
1094 platform_driver_unregister(&mpc52xx_fec_mdio_driver);
1095 #endif
1096 }
1097
1098
1099 module_init(mpc52xx_fec_init);
1100 module_exit(mpc52xx_fec_exit);
1101
1102 MODULE_LICENSE("GPL");
1103 MODULE_AUTHOR("Dale Farnsworth");
1104 MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");