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Merge tag 'mac80211-for-davem-2015-05-04' of git://git.kernel.org/pub/scm/linux/kerne...
[deliverable/linux.git] / drivers / net / ethernet / freescale / fec_mpc52xx.c
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19 #include <linux/dma-mapping.h>
20 #include <linux/module.h>
21
22 #include <linux/kernel.h>
23 #include <linux/types.h>
24 #include <linux/spinlock.h>
25 #include <linux/slab.h>
26 #include <linux/errno.h>
27 #include <linux/init.h>
28 #include <linux/interrupt.h>
29 #include <linux/crc32.h>
30 #include <linux/hardirq.h>
31 #include <linux/delay.h>
32 #include <linux/of_device.h>
33 #include <linux/of_mdio.h>
34 #include <linux/of_net.h>
35 #include <linux/of_platform.h>
36
37 #include <linux/netdevice.h>
38 #include <linux/etherdevice.h>
39 #include <linux/ethtool.h>
40 #include <linux/skbuff.h>
41
42 #include <asm/io.h>
43 #include <asm/delay.h>
44 #include <asm/mpc52xx.h>
45
46 #include <linux/fsl/bestcomm/bestcomm.h>
47 #include <linux/fsl/bestcomm/fec.h>
48
49 #include "fec_mpc52xx.h"
50
51 #define DRIVER_NAME "mpc52xx-fec"
52
53 /* Private driver data structure */
54 struct mpc52xx_fec_priv {
55 struct net_device *ndev;
56 int duplex;
57 int speed;
58 int r_irq;
59 int t_irq;
60 struct mpc52xx_fec __iomem *fec;
61 struct bcom_task *rx_dmatsk;
62 struct bcom_task *tx_dmatsk;
63 spinlock_t lock;
64 int msg_enable;
65
66 /* MDIO link details */
67 unsigned int mdio_speed;
68 struct device_node *phy_node;
69 struct phy_device *phydev;
70 enum phy_state link;
71 int seven_wire_mode;
72 };
73
74
75 static irqreturn_t mpc52xx_fec_interrupt(int, void *);
76 static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *);
77 static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *);
78 static void mpc52xx_fec_stop(struct net_device *dev);
79 static void mpc52xx_fec_start(struct net_device *dev);
80 static void mpc52xx_fec_reset(struct net_device *dev);
81
82 #define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \
83 NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP)
84 static int debug = -1; /* the above default */
85 module_param(debug, int, 0);
86 MODULE_PARM_DESC(debug, "debugging messages level");
87
88 static void mpc52xx_fec_tx_timeout(struct net_device *dev)
89 {
90 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
91 unsigned long flags;
92
93 dev_warn(&dev->dev, "transmit timed out\n");
94
95 spin_lock_irqsave(&priv->lock, flags);
96 mpc52xx_fec_reset(dev);
97 dev->stats.tx_errors++;
98 spin_unlock_irqrestore(&priv->lock, flags);
99
100 netif_wake_queue(dev);
101 }
102
103 static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac)
104 {
105 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
106 struct mpc52xx_fec __iomem *fec = priv->fec;
107
108 out_be32(&fec->paddr1, *(u32 *)(&mac[0]));
109 out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE);
110 }
111
112 static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr)
113 {
114 struct sockaddr *sock = addr;
115
116 memcpy(dev->dev_addr, sock->sa_data, dev->addr_len);
117
118 mpc52xx_fec_set_paddr(dev, sock->sa_data);
119 return 0;
120 }
121
122 static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s)
123 {
124 while (!bcom_queue_empty(s)) {
125 struct bcom_fec_bd *bd;
126 struct sk_buff *skb;
127
128 skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd);
129 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
130 DMA_FROM_DEVICE);
131 kfree_skb(skb);
132 }
133 }
134
135 static void
136 mpc52xx_fec_rx_submit(struct net_device *dev, struct sk_buff *rskb)
137 {
138 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
139 struct bcom_fec_bd *bd;
140
141 bd = (struct bcom_fec_bd *) bcom_prepare_next_buffer(priv->rx_dmatsk);
142 bd->status = FEC_RX_BUFFER_SIZE;
143 bd->skb_pa = dma_map_single(dev->dev.parent, rskb->data,
144 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
145 bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
146 }
147
148 static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
149 {
150 struct sk_buff *skb;
151
152 while (!bcom_queue_full(rxtsk)) {
153 skb = netdev_alloc_skb(dev, FEC_RX_BUFFER_SIZE);
154 if (!skb)
155 return -EAGAIN;
156
157 /* zero out the initial receive buffers to aid debugging */
158 memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
159 mpc52xx_fec_rx_submit(dev, skb);
160 }
161 return 0;
162 }
163
164 /* based on generic_adjust_link from fs_enet-main.c */
165 static void mpc52xx_fec_adjust_link(struct net_device *dev)
166 {
167 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
168 struct phy_device *phydev = priv->phydev;
169 int new_state = 0;
170
171 if (phydev->link != PHY_DOWN) {
172 if (phydev->duplex != priv->duplex) {
173 struct mpc52xx_fec __iomem *fec = priv->fec;
174 u32 rcntrl;
175 u32 tcntrl;
176
177 new_state = 1;
178 priv->duplex = phydev->duplex;
179
180 rcntrl = in_be32(&fec->r_cntrl);
181 tcntrl = in_be32(&fec->x_cntrl);
182
183 rcntrl &= ~FEC_RCNTRL_DRT;
184 tcntrl &= ~FEC_TCNTRL_FDEN;
185 if (phydev->duplex == DUPLEX_FULL)
186 tcntrl |= FEC_TCNTRL_FDEN; /* FD enable */
187 else
188 rcntrl |= FEC_RCNTRL_DRT; /* disable Rx on Tx (HD) */
189
190 out_be32(&fec->r_cntrl, rcntrl);
191 out_be32(&fec->x_cntrl, tcntrl);
192 }
193
194 if (phydev->speed != priv->speed) {
195 new_state = 1;
196 priv->speed = phydev->speed;
197 }
198
199 if (priv->link == PHY_DOWN) {
200 new_state = 1;
201 priv->link = phydev->link;
202 }
203
204 } else if (priv->link) {
205 new_state = 1;
206 priv->link = PHY_DOWN;
207 priv->speed = 0;
208 priv->duplex = -1;
209 }
210
211 if (new_state && netif_msg_link(priv))
212 phy_print_status(phydev);
213 }
214
215 static int mpc52xx_fec_open(struct net_device *dev)
216 {
217 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
218 int err = -EBUSY;
219
220 if (priv->phy_node) {
221 priv->phydev = of_phy_connect(priv->ndev, priv->phy_node,
222 mpc52xx_fec_adjust_link, 0, 0);
223 if (!priv->phydev) {
224 dev_err(&dev->dev, "of_phy_connect failed\n");
225 return -ENODEV;
226 }
227 phy_start(priv->phydev);
228 }
229
230 if (request_irq(dev->irq, mpc52xx_fec_interrupt, IRQF_SHARED,
231 DRIVER_NAME "_ctrl", dev)) {
232 dev_err(&dev->dev, "ctrl interrupt request failed\n");
233 goto free_phy;
234 }
235 if (request_irq(priv->r_irq, mpc52xx_fec_rx_interrupt, 0,
236 DRIVER_NAME "_rx", dev)) {
237 dev_err(&dev->dev, "rx interrupt request failed\n");
238 goto free_ctrl_irq;
239 }
240 if (request_irq(priv->t_irq, mpc52xx_fec_tx_interrupt, 0,
241 DRIVER_NAME "_tx", dev)) {
242 dev_err(&dev->dev, "tx interrupt request failed\n");
243 goto free_2irqs;
244 }
245
246 bcom_fec_rx_reset(priv->rx_dmatsk);
247 bcom_fec_tx_reset(priv->tx_dmatsk);
248
249 err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
250 if (err) {
251 dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
252 goto free_irqs;
253 }
254
255 bcom_enable(priv->rx_dmatsk);
256 bcom_enable(priv->tx_dmatsk);
257
258 mpc52xx_fec_start(dev);
259
260 netif_start_queue(dev);
261
262 return 0;
263
264 free_irqs:
265 free_irq(priv->t_irq, dev);
266 free_2irqs:
267 free_irq(priv->r_irq, dev);
268 free_ctrl_irq:
269 free_irq(dev->irq, dev);
270 free_phy:
271 if (priv->phydev) {
272 phy_stop(priv->phydev);
273 phy_disconnect(priv->phydev);
274 priv->phydev = NULL;
275 }
276
277 return err;
278 }
279
280 static int mpc52xx_fec_close(struct net_device *dev)
281 {
282 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
283
284 netif_stop_queue(dev);
285
286 mpc52xx_fec_stop(dev);
287
288 mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
289
290 free_irq(dev->irq, dev);
291 free_irq(priv->r_irq, dev);
292 free_irq(priv->t_irq, dev);
293
294 if (priv->phydev) {
295 /* power down phy */
296 phy_stop(priv->phydev);
297 phy_disconnect(priv->phydev);
298 priv->phydev = NULL;
299 }
300
301 return 0;
302 }
303
304 /* This will only be invoked if your driver is _not_ in XOFF state.
305 * What this means is that you need not check it, and that this
306 * invariant will hold if you make sure that the netif_*_queue()
307 * calls are done at the proper times.
308 */
309 static int mpc52xx_fec_start_xmit(struct sk_buff *skb, struct net_device *dev)
310 {
311 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
312 struct bcom_fec_bd *bd;
313 unsigned long flags;
314
315 if (bcom_queue_full(priv->tx_dmatsk)) {
316 if (net_ratelimit())
317 dev_err(&dev->dev, "transmit queue overrun\n");
318 return NETDEV_TX_BUSY;
319 }
320
321 spin_lock_irqsave(&priv->lock, flags);
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 skb_tx_timestamp(skb);
331 bcom_submit_next_buffer(priv->tx_dmatsk, skb);
332 spin_unlock_irqrestore(&priv->lock, flags);
333
334 if (bcom_queue_full(priv->tx_dmatsk)) {
335 netif_stop_queue(dev);
336 }
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 while (bcom_buffer_done(priv->tx_dmatsk)) {
365 struct sk_buff *skb;
366 struct bcom_fec_bd *bd;
367 skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
368 (struct bcom_bd **)&bd);
369 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
370 DMA_TO_DEVICE);
371
372 dev_kfree_skb_irq(skb);
373 }
374 spin_unlock(&priv->lock);
375
376 netif_wake_queue(dev);
377
378 return IRQ_HANDLED;
379 }
380
381 static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
382 {
383 struct net_device *dev = dev_id;
384 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
385 struct sk_buff *rskb; /* received sk_buff */
386 struct sk_buff *skb; /* new sk_buff to enqueue in its place */
387 struct bcom_fec_bd *bd;
388 u32 status, physaddr;
389 int length;
390
391 spin_lock(&priv->lock);
392
393 while (bcom_buffer_done(priv->rx_dmatsk)) {
394
395 rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
396 (struct bcom_bd **)&bd);
397 physaddr = bd->skb_pa;
398
399 /* Test for errors in received frame */
400 if (status & BCOM_FEC_RX_BD_ERRORS) {
401 /* Drop packet and reuse the buffer */
402 mpc52xx_fec_rx_submit(dev, rskb);
403 dev->stats.rx_dropped++;
404 continue;
405 }
406
407 /* skbs are allocated on open, so now we allocate a new one,
408 * and remove the old (with the packet) */
409 skb = netdev_alloc_skb(dev, FEC_RX_BUFFER_SIZE);
410 if (!skb) {
411 /* Can't get a new one : reuse the same & drop pkt */
412 dev_notice(&dev->dev, "Low memory - dropped packet.\n");
413 mpc52xx_fec_rx_submit(dev, rskb);
414 dev->stats.rx_dropped++;
415 continue;
416 }
417
418 /* Enqueue the new sk_buff back on the hardware */
419 mpc52xx_fec_rx_submit(dev, skb);
420
421 /* Process the received skb - Drop the spin lock while
422 * calling into the network stack */
423 spin_unlock(&priv->lock);
424
425 dma_unmap_single(dev->dev.parent, physaddr, rskb->len,
426 DMA_FROM_DEVICE);
427 length = status & BCOM_FEC_RX_BD_LEN_MASK;
428 skb_put(rskb, length - 4); /* length without CRC32 */
429 rskb->protocol = eth_type_trans(rskb, dev);
430 if (!skb_defer_rx_timestamp(rskb))
431 netif_rx(rskb);
432
433 spin_lock(&priv->lock);
434 }
435
436 spin_unlock(&priv->lock);
437
438 return IRQ_HANDLED;
439 }
440
441 static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
442 {
443 struct net_device *dev = dev_id;
444 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
445 struct mpc52xx_fec __iomem *fec = priv->fec;
446 u32 ievent;
447
448 ievent = in_be32(&fec->ievent);
449
450 ievent &= ~FEC_IEVENT_MII; /* mii is handled separately */
451 if (!ievent)
452 return IRQ_NONE;
453
454 out_be32(&fec->ievent, ievent); /* clear pending events */
455
456 /* on fifo error, soft-reset fec */
457 if (ievent & (FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) {
458
459 if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR))
460 dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n");
461 if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
462 dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");
463
464 spin_lock(&priv->lock);
465 mpc52xx_fec_reset(dev);
466 spin_unlock(&priv->lock);
467
468 return IRQ_HANDLED;
469 }
470
471 if (ievent & ~FEC_IEVENT_TFINT)
472 dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
473
474 return IRQ_HANDLED;
475 }
476
477 /*
478 * Get the current statistics.
479 * This may be called with the card open or closed.
480 */
481 static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
482 {
483 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
484 struct net_device_stats *stats = &dev->stats;
485 struct mpc52xx_fec __iomem *fec = priv->fec;
486
487 stats->rx_bytes = in_be32(&fec->rmon_r_octets);
488 stats->rx_packets = in_be32(&fec->rmon_r_packets);
489 stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
490 in_be32(&fec->rmon_r_undersize) +
491 in_be32(&fec->rmon_r_oversize) +
492 in_be32(&fec->rmon_r_frag) +
493 in_be32(&fec->rmon_r_jab);
494
495 stats->tx_bytes = in_be32(&fec->rmon_t_octets);
496 stats->tx_packets = in_be32(&fec->rmon_t_packets);
497 stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
498 in_be32(&fec->rmon_t_undersize) +
499 in_be32(&fec->rmon_t_oversize) +
500 in_be32(&fec->rmon_t_frag) +
501 in_be32(&fec->rmon_t_jab);
502
503 stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
504 stats->collisions = in_be32(&fec->rmon_t_col);
505
506 /* detailed rx_errors: */
507 stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
508 + in_be32(&fec->rmon_r_oversize)
509 + in_be32(&fec->rmon_r_frag)
510 + in_be32(&fec->rmon_r_jab);
511 stats->rx_over_errors = in_be32(&fec->r_macerr);
512 stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
513 stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
514 stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
515 stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);
516
517 /* detailed tx_errors: */
518 stats->tx_aborted_errors = 0;
519 stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
520 stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
521 stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
522 stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);
523
524 return stats;
525 }
526
527 /*
528 * Read MIB counters in order to reset them,
529 * then zero all the stats fields in memory
530 */
531 static void mpc52xx_fec_reset_stats(struct net_device *dev)
532 {
533 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
534 struct mpc52xx_fec __iomem *fec = priv->fec;
535
536 out_be32(&fec->mib_control, FEC_MIB_DISABLE);
537 memset_io(&fec->rmon_t_drop, 0,
538 offsetof(struct mpc52xx_fec, reserved10) -
539 offsetof(struct mpc52xx_fec, rmon_t_drop));
540 out_be32(&fec->mib_control, 0);
541
542 memset(&dev->stats, 0, sizeof(dev->stats));
543 }
544
545 /*
546 * Set or clear the multicast filter for this adaptor.
547 */
548 static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
549 {
550 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
551 struct mpc52xx_fec __iomem *fec = priv->fec;
552 u32 rx_control;
553
554 rx_control = in_be32(&fec->r_cntrl);
555
556 if (dev->flags & IFF_PROMISC) {
557 rx_control |= FEC_RCNTRL_PROM;
558 out_be32(&fec->r_cntrl, rx_control);
559 } else {
560 rx_control &= ~FEC_RCNTRL_PROM;
561 out_be32(&fec->r_cntrl, rx_control);
562
563 if (dev->flags & IFF_ALLMULTI) {
564 out_be32(&fec->gaddr1, 0xffffffff);
565 out_be32(&fec->gaddr2, 0xffffffff);
566 } else {
567 u32 crc;
568 struct netdev_hw_addr *ha;
569 u32 gaddr1 = 0x00000000;
570 u32 gaddr2 = 0x00000000;
571
572 netdev_for_each_mc_addr(ha, dev) {
573 crc = ether_crc_le(6, ha->addr) >> 26;
574 if (crc >= 32)
575 gaddr1 |= 1 << (crc-32);
576 else
577 gaddr2 |= 1 << crc;
578 }
579 out_be32(&fec->gaddr1, gaddr1);
580 out_be32(&fec->gaddr2, gaddr2);
581 }
582 }
583 }
584
585 /**
586 * mpc52xx_fec_hw_init
587 * @dev: network device
588 *
589 * Setup various hardware setting, only needed once on start
590 */
591 static void mpc52xx_fec_hw_init(struct net_device *dev)
592 {
593 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
594 struct mpc52xx_fec __iomem *fec = priv->fec;
595 int i;
596
597 /* Whack a reset. We should wait for this. */
598 out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
599 for (i = 0; i < FEC_RESET_DELAY; ++i) {
600 if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
601 break;
602 udelay(1);
603 }
604 if (i == FEC_RESET_DELAY)
605 dev_err(&dev->dev, "FEC Reset timeout!\n");
606
607 /* set pause to 0x20 frames */
608 out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);
609
610 /* high service request will be deasserted when there's < 7 bytes in fifo
611 * low service request will be deasserted when there's < 4*7 bytes in fifo
612 */
613 out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
614 out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
615
616 /* alarm when <= x bytes in FIFO */
617 out_be32(&fec->rfifo_alarm, 0x0000030c);
618 out_be32(&fec->tfifo_alarm, 0x00000100);
619
620 /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
621 out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);
622
623 /* enable crc generation */
624 out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
625 out_be32(&fec->iaddr1, 0x00000000); /* No individual filter */
626 out_be32(&fec->iaddr2, 0x00000000); /* No individual filter */
627
628 /* set phy speed.
629 * this can't be done in phy driver, since it needs to be called
630 * before fec stuff (even on resume) */
631 out_be32(&fec->mii_speed, priv->mdio_speed);
632 }
633
634 /**
635 * mpc52xx_fec_start
636 * @dev: network device
637 *
638 * This function is called to start or restart the FEC during a link
639 * change. This happens on fifo errors or when switching between half
640 * and full duplex.
641 */
642 static void mpc52xx_fec_start(struct net_device *dev)
643 {
644 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
645 struct mpc52xx_fec __iomem *fec = priv->fec;
646 u32 rcntrl;
647 u32 tcntrl;
648 u32 tmp;
649
650 /* clear sticky error bits */
651 tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
652 out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
653 out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);
654
655 /* FIFOs will reset on mpc52xx_fec_enable */
656 out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);
657
658 /* Set station address. */
659 mpc52xx_fec_set_paddr(dev, dev->dev_addr);
660
661 mpc52xx_fec_set_multicast_list(dev);
662
663 /* set max frame len, enable flow control, select mii mode */
664 rcntrl = FEC_RX_BUFFER_SIZE << 16; /* max frame length */
665 rcntrl |= FEC_RCNTRL_FCE;
666
667 if (!priv->seven_wire_mode)
668 rcntrl |= FEC_RCNTRL_MII_MODE;
669
670 if (priv->duplex == DUPLEX_FULL)
671 tcntrl = FEC_TCNTRL_FDEN; /* FD enable */
672 else {
673 rcntrl |= FEC_RCNTRL_DRT; /* disable Rx on Tx (HD) */
674 tcntrl = 0;
675 }
676 out_be32(&fec->r_cntrl, rcntrl);
677 out_be32(&fec->x_cntrl, tcntrl);
678
679 /* Clear any outstanding interrupt. */
680 out_be32(&fec->ievent, 0xffffffff);
681
682 /* Enable interrupts we wish to service. */
683 out_be32(&fec->imask, FEC_IMASK_ENABLE);
684
685 /* And last, enable the transmit and receive processing. */
686 out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
687 out_be32(&fec->r_des_active, 0x01000000);
688 }
689
690 /**
691 * mpc52xx_fec_stop
692 * @dev: network device
693 *
694 * stop all activity on fec and empty dma buffers
695 */
696 static void mpc52xx_fec_stop(struct net_device *dev)
697 {
698 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
699 struct mpc52xx_fec __iomem *fec = priv->fec;
700 unsigned long timeout;
701
702 /* disable all interrupts */
703 out_be32(&fec->imask, 0);
704
705 /* Disable the rx task. */
706 bcom_disable(priv->rx_dmatsk);
707
708 /* Wait for tx queue to drain, but only if we're in process context */
709 if (!in_interrupt()) {
710 timeout = jiffies + msecs_to_jiffies(2000);
711 while (time_before(jiffies, timeout) &&
712 !bcom_queue_empty(priv->tx_dmatsk))
713 msleep(100);
714
715 if (time_after_eq(jiffies, timeout))
716 dev_err(&dev->dev, "queues didn't drain\n");
717 #if 1
718 if (time_after_eq(jiffies, timeout)) {
719 dev_err(&dev->dev, " tx: index: %i, outdex: %i\n",
720 priv->tx_dmatsk->index,
721 priv->tx_dmatsk->outdex);
722 dev_err(&dev->dev, " rx: index: %i, outdex: %i\n",
723 priv->rx_dmatsk->index,
724 priv->rx_dmatsk->outdex);
725 }
726 #endif
727 }
728
729 bcom_disable(priv->tx_dmatsk);
730
731 /* Stop FEC */
732 out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
733 }
734
735 /* reset fec and bestcomm tasks */
736 static void mpc52xx_fec_reset(struct net_device *dev)
737 {
738 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
739 struct mpc52xx_fec __iomem *fec = priv->fec;
740
741 mpc52xx_fec_stop(dev);
742
743 out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
744 out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);
745
746 mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
747
748 mpc52xx_fec_hw_init(dev);
749
750 bcom_fec_rx_reset(priv->rx_dmatsk);
751 bcom_fec_tx_reset(priv->tx_dmatsk);
752
753 mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
754
755 bcom_enable(priv->rx_dmatsk);
756 bcom_enable(priv->tx_dmatsk);
757
758 mpc52xx_fec_start(dev);
759
760 netif_wake_queue(dev);
761 }
762
763
764 /* ethtool interface */
765
766 static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
767 {
768 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
769
770 if (!priv->phydev)
771 return -ENODEV;
772
773 return phy_ethtool_gset(priv->phydev, cmd);
774 }
775
776 static int mpc52xx_fec_set_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_sset(priv->phydev, cmd);
784 }
785
786 static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
787 {
788 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
789 return priv->msg_enable;
790 }
791
792 static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
793 {
794 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
795 priv->msg_enable = level;
796 }
797
798 static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
799 .get_settings = mpc52xx_fec_get_settings,
800 .set_settings = mpc52xx_fec_set_settings,
801 .get_link = ethtool_op_get_link,
802 .get_msglevel = mpc52xx_fec_get_msglevel,
803 .set_msglevel = mpc52xx_fec_set_msglevel,
804 .get_ts_info = ethtool_op_get_ts_info,
805 };
806
807
808 static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
809 {
810 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
811
812 if (!priv->phydev)
813 return -ENOTSUPP;
814
815 return phy_mii_ioctl(priv->phydev, rq, cmd);
816 }
817
818 static const struct net_device_ops mpc52xx_fec_netdev_ops = {
819 .ndo_open = mpc52xx_fec_open,
820 .ndo_stop = mpc52xx_fec_close,
821 .ndo_start_xmit = mpc52xx_fec_start_xmit,
822 .ndo_set_rx_mode = mpc52xx_fec_set_multicast_list,
823 .ndo_set_mac_address = mpc52xx_fec_set_mac_address,
824 .ndo_validate_addr = eth_validate_addr,
825 .ndo_do_ioctl = mpc52xx_fec_ioctl,
826 .ndo_change_mtu = eth_change_mtu,
827 .ndo_tx_timeout = mpc52xx_fec_tx_timeout,
828 .ndo_get_stats = mpc52xx_fec_get_stats,
829 #ifdef CONFIG_NET_POLL_CONTROLLER
830 .ndo_poll_controller = mpc52xx_fec_poll_controller,
831 #endif
832 };
833
834 /* ======================================================================== */
835 /* OF Driver */
836 /* ======================================================================== */
837
838 static int mpc52xx_fec_probe(struct platform_device *op)
839 {
840 int rv;
841 struct net_device *ndev;
842 struct mpc52xx_fec_priv *priv = NULL;
843 struct resource mem;
844 const u32 *prop;
845 int prop_size;
846 struct device_node *np = op->dev.of_node;
847 const char *mac_addr;
848
849 phys_addr_t rx_fifo;
850 phys_addr_t tx_fifo;
851
852 /* Get the ether ndev & it's private zone */
853 ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
854 if (!ndev)
855 return -ENOMEM;
856
857 priv = netdev_priv(ndev);
858 priv->ndev = ndev;
859
860 /* Reserve FEC control zone */
861 rv = of_address_to_resource(np, 0, &mem);
862 if (rv) {
863 pr_err("Error while parsing device node resource\n");
864 goto err_netdev;
865 }
866 if (resource_size(&mem) < sizeof(struct mpc52xx_fec)) {
867 pr_err("invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
868 (unsigned long)resource_size(&mem),
869 sizeof(struct mpc52xx_fec));
870 rv = -EINVAL;
871 goto err_netdev;
872 }
873
874 if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec),
875 DRIVER_NAME)) {
876 rv = -EBUSY;
877 goto err_netdev;
878 }
879
880 /* Init ether ndev with what we have */
881 ndev->netdev_ops = &mpc52xx_fec_netdev_ops;
882 ndev->ethtool_ops = &mpc52xx_fec_ethtool_ops;
883 ndev->watchdog_timeo = FEC_WATCHDOG_TIMEOUT;
884 ndev->base_addr = mem.start;
885 SET_NETDEV_DEV(ndev, &op->dev);
886
887 spin_lock_init(&priv->lock);
888
889 /* ioremap the zones */
890 priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));
891
892 if (!priv->fec) {
893 rv = -ENOMEM;
894 goto err_mem_region;
895 }
896
897 /* Bestcomm init */
898 rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
899 tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);
900
901 priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
902 priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);
903
904 if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
905 pr_err("Can not init SDMA tasks\n");
906 rv = -ENOMEM;
907 goto err_rx_tx_dmatsk;
908 }
909
910 /* Get the IRQ we need one by one */
911 /* Control */
912 ndev->irq = irq_of_parse_and_map(np, 0);
913
914 /* RX */
915 priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);
916
917 /* TX */
918 priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);
919
920 /*
921 * MAC address init:
922 *
923 * First try to read MAC address from DT
924 */
925 mac_addr = of_get_mac_address(np);
926 if (mac_addr) {
927 memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
928 } else {
929 struct mpc52xx_fec __iomem *fec = priv->fec;
930
931 /*
932 * If the MAC addresse is not provided via DT then read
933 * it back from the controller regs
934 */
935 *(u32 *)(&ndev->dev_addr[0]) = in_be32(&fec->paddr1);
936 *(u16 *)(&ndev->dev_addr[4]) = in_be32(&fec->paddr2) >> 16;
937 }
938
939 /*
940 * Check if the MAC address is valid, if not get a random one
941 */
942 if (!is_valid_ether_addr(ndev->dev_addr)) {
943 eth_hw_addr_random(ndev);
944 dev_warn(&ndev->dev, "using random MAC address %pM\n",
945 ndev->dev_addr);
946 }
947
948 priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
949
950 /*
951 * Link mode configuration
952 */
953
954 /* Start with safe defaults for link connection */
955 priv->speed = 100;
956 priv->duplex = DUPLEX_HALF;
957 priv->mdio_speed = ((mpc5xxx_get_bus_frequency(np) >> 20) / 5) << 1;
958
959 /* The current speed preconfigures the speed of the MII link */
960 prop = of_get_property(np, "current-speed", &prop_size);
961 if (prop && (prop_size >= sizeof(u32) * 2)) {
962 priv->speed = prop[0];
963 priv->duplex = prop[1] ? DUPLEX_FULL : DUPLEX_HALF;
964 }
965
966 /* If there is a phy handle, then get the PHY node */
967 priv->phy_node = of_parse_phandle(np, "phy-handle", 0);
968
969 /* the 7-wire property means don't use MII mode */
970 if (of_find_property(np, "fsl,7-wire-mode", NULL)) {
971 priv->seven_wire_mode = 1;
972 dev_info(&ndev->dev, "using 7-wire PHY mode\n");
973 }
974
975 /* Hardware init */
976 mpc52xx_fec_hw_init(ndev);
977 mpc52xx_fec_reset_stats(ndev);
978
979 rv = register_netdev(ndev);
980 if (rv < 0)
981 goto err_node;
982
983 /* We're done ! */
984 platform_set_drvdata(op, ndev);
985 netdev_info(ndev, "%s MAC %pM\n",
986 op->dev.of_node->full_name, ndev->dev_addr);
987
988 return 0;
989
990 err_node:
991 of_node_put(priv->phy_node);
992 irq_dispose_mapping(ndev->irq);
993 err_rx_tx_dmatsk:
994 if (priv->rx_dmatsk)
995 bcom_fec_rx_release(priv->rx_dmatsk);
996 if (priv->tx_dmatsk)
997 bcom_fec_tx_release(priv->tx_dmatsk);
998 iounmap(priv->fec);
999 err_mem_region:
1000 release_mem_region(mem.start, sizeof(struct mpc52xx_fec));
1001 err_netdev:
1002 free_netdev(ndev);
1003
1004 return rv;
1005 }
1006
1007 static int
1008 mpc52xx_fec_remove(struct platform_device *op)
1009 {
1010 struct net_device *ndev;
1011 struct mpc52xx_fec_priv *priv;
1012
1013 ndev = platform_get_drvdata(op);
1014 priv = netdev_priv(ndev);
1015
1016 unregister_netdev(ndev);
1017
1018 of_node_put(priv->phy_node);
1019 priv->phy_node = NULL;
1020
1021 irq_dispose_mapping(ndev->irq);
1022
1023 bcom_fec_rx_release(priv->rx_dmatsk);
1024 bcom_fec_tx_release(priv->tx_dmatsk);
1025
1026 iounmap(priv->fec);
1027
1028 release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));
1029
1030 free_netdev(ndev);
1031
1032 return 0;
1033 }
1034
1035 #ifdef CONFIG_PM
1036 static int mpc52xx_fec_of_suspend(struct platform_device *op, pm_message_t state)
1037 {
1038 struct net_device *dev = platform_get_drvdata(op);
1039
1040 if (netif_running(dev))
1041 mpc52xx_fec_close(dev);
1042
1043 return 0;
1044 }
1045
1046 static int mpc52xx_fec_of_resume(struct platform_device *op)
1047 {
1048 struct net_device *dev = platform_get_drvdata(op);
1049
1050 mpc52xx_fec_hw_init(dev);
1051 mpc52xx_fec_reset_stats(dev);
1052
1053 if (netif_running(dev))
1054 mpc52xx_fec_open(dev);
1055
1056 return 0;
1057 }
1058 #endif
1059
1060 static const struct of_device_id mpc52xx_fec_match[] = {
1061 { .compatible = "fsl,mpc5200b-fec", },
1062 { .compatible = "fsl,mpc5200-fec", },
1063 { .compatible = "mpc5200-fec", },
1064 { }
1065 };
1066
1067 MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);
1068
1069 static struct platform_driver mpc52xx_fec_driver = {
1070 .driver = {
1071 .name = DRIVER_NAME,
1072 .of_match_table = mpc52xx_fec_match,
1073 },
1074 .probe = mpc52xx_fec_probe,
1075 .remove = mpc52xx_fec_remove,
1076 #ifdef CONFIG_PM
1077 .suspend = mpc52xx_fec_of_suspend,
1078 .resume = mpc52xx_fec_of_resume,
1079 #endif
1080 };
1081
1082
1083 /* ======================================================================== */
1084 /* Module */
1085 /* ======================================================================== */
1086
1087 static int __init
1088 mpc52xx_fec_init(void)
1089 {
1090 #ifdef CONFIG_FEC_MPC52xx_MDIO
1091 int ret;
1092 ret = platform_driver_register(&mpc52xx_fec_mdio_driver);
1093 if (ret) {
1094 pr_err("failed to register mdio driver\n");
1095 return ret;
1096 }
1097 #endif
1098 return platform_driver_register(&mpc52xx_fec_driver);
1099 }
1100
1101 static void __exit
1102 mpc52xx_fec_exit(void)
1103 {
1104 platform_driver_unregister(&mpc52xx_fec_driver);
1105 #ifdef CONFIG_FEC_MPC52xx_MDIO
1106 platform_driver_unregister(&mpc52xx_fec_mdio_driver);
1107 #endif
1108 }
1109
1110
1111 module_init(mpc52xx_fec_init);
1112 module_exit(mpc52xx_fec_exit);
1113
1114 MODULE_LICENSE("GPL");
1115 MODULE_AUTHOR("Dale Farnsworth");
1116 MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");
Linux kernel - Deliverables
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