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ondemand: Solve a big performance issue by counting IOWAIT time as busy
[linux/fpc-iii.git] / drivers / net / fec_mpc52xx.c
blob4a43e56b739496fddaf8daba5202f2f20831271d
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/slab.h>
23 #include <linux/errno.h>
24 #include <linux/init.h>
25 #include <linux/crc32.h>
26 #include <linux/hardirq.h>
27 #include <linux/delay.h>
28 #include <linux/of_device.h>
29 #include <linux/of_mdio.h>
30 #include <linux/of_platform.h>
31
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/ethtool.h>
35 #include <linux/skbuff.h>
36
37 #include <asm/io.h>
38 #include <asm/delay.h>
39 #include <asm/mpc52xx.h>
40
41 #include <sysdev/bestcomm/bestcomm.h>
42 #include <sysdev/bestcomm/fec.h>
43
44 #include "fec_mpc52xx.h"
45
46 #define DRIVER_NAME "mpc52xx-fec"
47
48 /* Private driver data structure */
49 struct mpc52xx_fec_priv {
50 struct net_device *ndev;
51 int duplex;
52 int speed;
53 int r_irq;
54 int t_irq;
55 struct mpc52xx_fec __iomem *fec;
56 struct bcom_task *rx_dmatsk;
57 struct bcom_task *tx_dmatsk;
58 spinlock_t lock;
59 int msg_enable;
60
61 /* MDIO link details */
62 unsigned int mdio_speed;
63 struct device_node *phy_node;
64 struct phy_device *phydev;
65 enum phy_state link;
66 int seven_wire_mode;
67 };
68
69
70 static irqreturn_t mpc52xx_fec_interrupt(int, void *);
71 static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *);
72 static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *);
73 static void mpc52xx_fec_stop(struct net_device *dev);
74 static void mpc52xx_fec_start(struct net_device *dev);
75 static void mpc52xx_fec_reset(struct net_device *dev);
76
77 static u8 mpc52xx_fec_mac_addr[6];
78 module_param_array_named(mac, mpc52xx_fec_mac_addr, byte, NULL, 0);
79 MODULE_PARM_DESC(mac, "six hex digits, ie. 0x1,0x2,0xc0,0x01,0xba,0xbe");
80
81 #define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \
82 NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP)
83 static int debug = -1; /* the above default */
84 module_param(debug, int, 0);
85 MODULE_PARM_DESC(debug, "debugging messages level");
86
87 static void mpc52xx_fec_tx_timeout(struct net_device *dev)
88 {
89 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
90 unsigned long flags;
91
92 dev_warn(&dev->dev, "transmit timed out\n");
93
94 spin_lock_irqsave(&priv->lock, flags);
95 mpc52xx_fec_reset(dev);
96 dev->stats.tx_errors++;
97 spin_unlock_irqrestore(&priv->lock, flags);
98
99 netif_wake_queue(dev);
100 }
101
102 static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac)
103 {
104 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
105 struct mpc52xx_fec __iomem *fec = priv->fec;
106
107 out_be32(&fec->paddr1, *(u32 *)(&mac[0]));
108 out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE);
109 }
110
111 static void mpc52xx_fec_get_paddr(struct net_device *dev, u8 *mac)
112 {
113 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
114 struct mpc52xx_fec __iomem *fec = priv->fec;
115
116 *(u32 *)(&mac[0]) = in_be32(&fec->paddr1);
117 *(u16 *)(&mac[4]) = in_be32(&fec->paddr2) >> 16;
118 }
119
120 static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr)
121 {
122 struct sockaddr *sock = addr;
123
124 memcpy(dev->dev_addr, sock->sa_data, dev->addr_len);
125
126 mpc52xx_fec_set_paddr(dev, sock->sa_data);
127 return 0;
128 }
129
130 static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s)
131 {
132 while (!bcom_queue_empty(s)) {
133 struct bcom_fec_bd *bd;
134 struct sk_buff *skb;
135
136 skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd);
137 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
138 DMA_FROM_DEVICE);
139 kfree_skb(skb);
140 }
141 }
142
143 static void
144 mpc52xx_fec_rx_submit(struct net_device *dev, struct sk_buff *rskb)
145 {
146 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
147 struct bcom_fec_bd *bd;
148
149 bd = (struct bcom_fec_bd *) bcom_prepare_next_buffer(priv->rx_dmatsk);
150 bd->status = FEC_RX_BUFFER_SIZE;
151 bd->skb_pa = dma_map_single(dev->dev.parent, rskb->data,
152 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
153 bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
154 }
155
156 static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
157 {
158 struct sk_buff *skb;
159
160 while (!bcom_queue_full(rxtsk)) {
161 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
162 if (!skb)
163 return -EAGAIN;
164
165 /* zero out the initial receive buffers to aid debugging */
166 memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
167 mpc52xx_fec_rx_submit(dev, skb);
168 }
169 return 0;
170 }
171
172 /* based on generic_adjust_link from fs_enet-main.c */
173 static void mpc52xx_fec_adjust_link(struct net_device *dev)
174 {
175 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
176 struct phy_device *phydev = priv->phydev;
177 int new_state = 0;
178
179 if (phydev->link != PHY_DOWN) {
180 if (phydev->duplex != priv->duplex) {
181 struct mpc52xx_fec __iomem *fec = priv->fec;
182 u32 rcntrl;
183 u32 tcntrl;
184
185 new_state = 1;
186 priv->duplex = phydev->duplex;
187
188 rcntrl = in_be32(&fec->r_cntrl);
189 tcntrl = in_be32(&fec->x_cntrl);
190
191 rcntrl &= ~FEC_RCNTRL_DRT;
192 tcntrl &= ~FEC_TCNTRL_FDEN;
193 if (phydev->duplex == DUPLEX_FULL)
194 tcntrl |= FEC_TCNTRL_FDEN; /* FD enable */
195 else
196 rcntrl |= FEC_RCNTRL_DRT; /* disable Rx on Tx (HD) */
197
198 out_be32(&fec->r_cntrl, rcntrl);
199 out_be32(&fec->x_cntrl, tcntrl);
200 }
201
202 if (phydev->speed != priv->speed) {
203 new_state = 1;
204 priv->speed = phydev->speed;
205 }
206
207 if (priv->link == PHY_DOWN) {
208 new_state = 1;
209 priv->link = phydev->link;
210 }
211
212 } else if (priv->link) {
213 new_state = 1;
214 priv->link = PHY_DOWN;
215 priv->speed = 0;
216 priv->duplex = -1;
217 }
218
219 if (new_state && netif_msg_link(priv))
220 phy_print_status(phydev);
221 }
222
223 static int mpc52xx_fec_open(struct net_device *dev)
224 {
225 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
226 int err = -EBUSY;
227
228 if (priv->phy_node) {
229 priv->phydev = of_phy_connect(priv->ndev, priv->phy_node,
230 mpc52xx_fec_adjust_link, 0, 0);
231 if (!priv->phydev) {
232 dev_err(&dev->dev, "of_phy_connect failed\n");
233 return -ENODEV;
234 }
235 phy_start(priv->phydev);
236 }
237
238 if (request_irq(dev->irq, mpc52xx_fec_interrupt, IRQF_SHARED,
239 DRIVER_NAME "_ctrl", dev)) {
240 dev_err(&dev->dev, "ctrl interrupt request failed\n");
241 goto free_phy;
242 }
243 if (request_irq(priv->r_irq, mpc52xx_fec_rx_interrupt, 0,
244 DRIVER_NAME "_rx", dev)) {
245 dev_err(&dev->dev, "rx interrupt request failed\n");
246 goto free_ctrl_irq;
247 }
248 if (request_irq(priv->t_irq, mpc52xx_fec_tx_interrupt, 0,
249 DRIVER_NAME "_tx", dev)) {
250 dev_err(&dev->dev, "tx interrupt request failed\n");
251 goto free_2irqs;
252 }
253
254 bcom_fec_rx_reset(priv->rx_dmatsk);
255 bcom_fec_tx_reset(priv->tx_dmatsk);
256
257 err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
258 if (err) {
259 dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
260 goto free_irqs;
261 }
262
263 bcom_enable(priv->rx_dmatsk);
264 bcom_enable(priv->tx_dmatsk);
265
266 mpc52xx_fec_start(dev);
267
268 netif_start_queue(dev);
269
270 return 0;
271
272 free_irqs:
273 free_irq(priv->t_irq, dev);
274 free_2irqs:
275 free_irq(priv->r_irq, dev);
276 free_ctrl_irq:
277 free_irq(dev->irq, dev);
278 free_phy:
279 if (priv->phydev) {
280 phy_stop(priv->phydev);
281 phy_disconnect(priv->phydev);
282 priv->phydev = NULL;
283 }
284
285 return err;
286 }
287
288 static int mpc52xx_fec_close(struct net_device *dev)
289 {
290 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
291
292 netif_stop_queue(dev);
293
294 mpc52xx_fec_stop(dev);
295
296 mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
297
298 free_irq(dev->irq, dev);
299 free_irq(priv->r_irq, dev);
300 free_irq(priv->t_irq, dev);
301
302 if (priv->phydev) {
303 /* power down phy */
304 phy_stop(priv->phydev);
305 phy_disconnect(priv->phydev);
306 priv->phydev = NULL;
307 }
308
309 return 0;
310 }
311
312 /* This will only be invoked if your driver is _not_ in XOFF state.
313 * What this means is that you need not check it, and that this
314 * invariant will hold if you make sure that the netif_*_queue()
315 * calls are done at the proper times.
316 */
317 static int mpc52xx_fec_start_xmit(struct sk_buff *skb, struct net_device *dev)
318 {
319 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
320 struct bcom_fec_bd *bd;
321 unsigned long flags;
322
323 if (bcom_queue_full(priv->tx_dmatsk)) {
324 if (net_ratelimit())
325 dev_err(&dev->dev, "transmit queue overrun\n");
326 return NETDEV_TX_BUSY;
327 }
328
329 spin_lock_irqsave(&priv->lock, flags);
330 dev->trans_start = jiffies;
331
332 bd = (struct bcom_fec_bd *)
333 bcom_prepare_next_buffer(priv->tx_dmatsk);
334
335 bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
336 bd->skb_pa = dma_map_single(dev->dev.parent, skb->data, skb->len,
337 DMA_TO_DEVICE);
338
339 bcom_submit_next_buffer(priv->tx_dmatsk, skb);
340 spin_unlock_irqrestore(&priv->lock, flags);
341
342 if (bcom_queue_full(priv->tx_dmatsk)) {
343 netif_stop_queue(dev);
344 }
345
346 return NETDEV_TX_OK;
347 }
348
349 #ifdef CONFIG_NET_POLL_CONTROLLER
350 static void mpc52xx_fec_poll_controller(struct net_device *dev)
351 {
352 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
353
354 disable_irq(priv->t_irq);
355 mpc52xx_fec_tx_interrupt(priv->t_irq, dev);
356 enable_irq(priv->t_irq);
357 disable_irq(priv->r_irq);
358 mpc52xx_fec_rx_interrupt(priv->r_irq, dev);
359 enable_irq(priv->r_irq);
360 }
361 #endif
362
363
364 /* This handles BestComm transmit task interrupts
365 */
366 static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
367 {
368 struct net_device *dev = dev_id;
369 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
370 unsigned long flags;
371
372 spin_lock_irqsave(&priv->lock, flags);
373 while (bcom_buffer_done(priv->tx_dmatsk)) {
374 struct sk_buff *skb;
375 struct bcom_fec_bd *bd;
376 skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
377 (struct bcom_bd **)&bd);
378 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
379 DMA_TO_DEVICE);
380
381 dev_kfree_skb_irq(skb);
382 }
383 spin_unlock_irqrestore(&priv->lock, flags);
384
385 netif_wake_queue(dev);
386
387 return IRQ_HANDLED;
388 }
389
390 static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
391 {
392 struct net_device *dev = dev_id;
393 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
394 struct sk_buff *rskb; /* received sk_buff */
395 struct sk_buff *skb; /* new sk_buff to enqueue in its place */
396 struct bcom_fec_bd *bd;
397 u32 status, physaddr;
398 int length;
399 unsigned long flags;
400
401 spin_lock_irqsave(&priv->lock, flags);
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_irqrestore(&priv->lock, flags);
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->dev = dev;
440 rskb->protocol = eth_type_trans(rskb, dev);
441 netif_rx(rskb);
442
443 spin_lock_irqsave(&priv->lock, flags);
444 }
445
446 spin_unlock_irqrestore(&priv->lock, flags);
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 unsigned long flags;
458
459 ievent = in_be32(&fec->ievent);
460
461 ievent &= ~FEC_IEVENT_MII; /* mii is handled separately */
462 if (!ievent)
463 return IRQ_NONE;
464
465 out_be32(&fec->ievent, ievent); /* clear pending events */
466
467 /* on fifo error, soft-reset fec */
468 if (ievent & (FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) {
469
470 if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR))
471 dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n");
472 if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
473 dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");
474
475 spin_lock_irqsave(&priv->lock, flags);
476 mpc52xx_fec_reset(dev);
477 spin_unlock_irqrestore(&priv->lock, flags);
478
479 return IRQ_HANDLED;
480 }
481
482 if (ievent & ~FEC_IEVENT_TFINT)
483 dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
484
485 return IRQ_HANDLED;
486 }
487
488 /*
489 * Get the current statistics.
490 * This may be called with the card open or closed.
491 */
492 static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
493 {
494 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
495 struct net_device_stats *stats = &dev->stats;
496 struct mpc52xx_fec __iomem *fec = priv->fec;
497
498 stats->rx_bytes = in_be32(&fec->rmon_r_octets);
499 stats->rx_packets = in_be32(&fec->rmon_r_packets);
500 stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
501 in_be32(&fec->rmon_r_undersize) +
502 in_be32(&fec->rmon_r_oversize) +
503 in_be32(&fec->rmon_r_frag) +
504 in_be32(&fec->rmon_r_jab);
505
506 stats->tx_bytes = in_be32(&fec->rmon_t_octets);
507 stats->tx_packets = in_be32(&fec->rmon_t_packets);
508 stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
509 in_be32(&fec->rmon_t_undersize) +
510 in_be32(&fec->rmon_t_oversize) +
511 in_be32(&fec->rmon_t_frag) +
512 in_be32(&fec->rmon_t_jab);
513
514 stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
515 stats->collisions = in_be32(&fec->rmon_t_col);
516
517 /* detailed rx_errors: */
518 stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
519 + in_be32(&fec->rmon_r_oversize)
520 + in_be32(&fec->rmon_r_frag)
521 + in_be32(&fec->rmon_r_jab);
522 stats->rx_over_errors = in_be32(&fec->r_macerr);
523 stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
524 stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
525 stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
526 stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);
527
528 /* detailed tx_errors: */
529 stats->tx_aborted_errors = 0;
530 stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
531 stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
532 stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
533 stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);
534
535 return stats;
536 }
537
538 /*
539 * Read MIB counters in order to reset them,
540 * then zero all the stats fields in memory
541 */
542 static void mpc52xx_fec_reset_stats(struct net_device *dev)
543 {
544 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
545 struct mpc52xx_fec __iomem *fec = priv->fec;
546
547 out_be32(&fec->mib_control, FEC_MIB_DISABLE);
548 memset_io(&fec->rmon_t_drop, 0,
549 offsetof(struct mpc52xx_fec, reserved10) -
550 offsetof(struct mpc52xx_fec, rmon_t_drop));
551 out_be32(&fec->mib_control, 0);
552
553 memset(&dev->stats, 0, sizeof(dev->stats));
554 }
555
556 /*
557 * Set or clear the multicast filter for this adaptor.
558 */
559 static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
560 {
561 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
562 struct mpc52xx_fec __iomem *fec = priv->fec;
563 u32 rx_control;
564
565 rx_control = in_be32(&fec->r_cntrl);
566
567 if (dev->flags & IFF_PROMISC) {
568 rx_control |= FEC_RCNTRL_PROM;
569 out_be32(&fec->r_cntrl, rx_control);
570 } else {
571 rx_control &= ~FEC_RCNTRL_PROM;
572 out_be32(&fec->r_cntrl, rx_control);
573
574 if (dev->flags & IFF_ALLMULTI) {
575 out_be32(&fec->gaddr1, 0xffffffff);
576 out_be32(&fec->gaddr2, 0xffffffff);
577 } else {
578 u32 crc;
579 struct dev_mc_list *dmi;
580 u32 gaddr1 = 0x00000000;
581 u32 gaddr2 = 0x00000000;
582
583 netdev_for_each_mc_addr(dmi, dev) {
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 }
590 out_be32(&fec->gaddr1, gaddr1);
591 out_be32(&fec->gaddr2, gaddr2);
592 }
593 }
594 }
595
596 /**
597 * mpc52xx_fec_hw_init
598 * @dev: network device
599 *
600 * Setup various hardware setting, only needed once on start
601 */
602 static void mpc52xx_fec_hw_init(struct net_device *dev)
603 {
604 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
605 struct mpc52xx_fec __iomem *fec = priv->fec;
606 int i;
607
608 /* Whack a reset. We should wait for this. */
609 out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
610 for (i = 0; i < FEC_RESET_DELAY; ++i) {
611 if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
612 break;
613 udelay(1);
614 }
615 if (i == FEC_RESET_DELAY)
616 dev_err(&dev->dev, "FEC Reset timeout!\n");
617
618 /* set pause to 0x20 frames */
619 out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);
620
621 /* high service request will be deasserted when there's < 7 bytes in fifo
622 * low service request will be deasserted when there's < 4*7 bytes in fifo
623 */
624 out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
625 out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
626
627 /* alarm when <= x bytes in FIFO */
628 out_be32(&fec->rfifo_alarm, 0x0000030c);
629 out_be32(&fec->tfifo_alarm, 0x00000100);
630
631 /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
632 out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);
633
634 /* enable crc generation */
635 out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
636 out_be32(&fec->iaddr1, 0x00000000); /* No individual filter */
637 out_be32(&fec->iaddr2, 0x00000000); /* No individual filter */
638
639 /* set phy speed.
640 * this can't be done in phy driver, since it needs to be called
641 * before fec stuff (even on resume) */
642 out_be32(&fec->mii_speed, priv->mdio_speed);
643 }
644
645 /**
646 * mpc52xx_fec_start
647 * @dev: network device
648 *
649 * This function is called to start or restart the FEC during a link
650 * change. This happens on fifo errors or when switching between half
651 * and full duplex.
652 */
653 static void mpc52xx_fec_start(struct net_device *dev)
654 {
655 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
656 struct mpc52xx_fec __iomem *fec = priv->fec;
657 u32 rcntrl;
658 u32 tcntrl;
659 u32 tmp;
660
661 /* clear sticky error bits */
662 tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
663 out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
664 out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);
665
666 /* FIFOs will reset on mpc52xx_fec_enable */
667 out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);
668
669 /* Set station address. */
670 mpc52xx_fec_set_paddr(dev, dev->dev_addr);
671
672 mpc52xx_fec_set_multicast_list(dev);
673
674 /* set max frame len, enable flow control, select mii mode */
675 rcntrl = FEC_RX_BUFFER_SIZE << 16; /* max frame length */
676 rcntrl |= FEC_RCNTRL_FCE;
677
678 if (!priv->seven_wire_mode)
679 rcntrl |= FEC_RCNTRL_MII_MODE;
680
681 if (priv->duplex == DUPLEX_FULL)
682 tcntrl = FEC_TCNTRL_FDEN; /* FD enable */
683 else {
684 rcntrl |= FEC_RCNTRL_DRT; /* disable Rx on Tx (HD) */
685 tcntrl = 0;
686 }
687 out_be32(&fec->r_cntrl, rcntrl);
688 out_be32(&fec->x_cntrl, tcntrl);
689
690 /* Clear any outstanding interrupt. */
691 out_be32(&fec->ievent, 0xffffffff);
692
693 /* Enable interrupts we wish to service. */
694 out_be32(&fec->imask, FEC_IMASK_ENABLE);
695
696 /* And last, enable the transmit and receive processing. */
697 out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
698 out_be32(&fec->r_des_active, 0x01000000);
699 }
700
701 /**
702 * mpc52xx_fec_stop
703 * @dev: network device
704 *
705 * stop all activity on fec and empty dma buffers
706 */
707 static void mpc52xx_fec_stop(struct net_device *dev)
708 {
709 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
710 struct mpc52xx_fec __iomem *fec = priv->fec;
711 unsigned long timeout;
712
713 /* disable all interrupts */
714 out_be32(&fec->imask, 0);
715
716 /* Disable the rx task. */
717 bcom_disable(priv->rx_dmatsk);
718
719 /* Wait for tx queue to drain, but only if we're in process context */
720 if (!in_interrupt()) {
721 timeout = jiffies + msecs_to_jiffies(2000);
722 while (time_before(jiffies, timeout) &&
723 !bcom_queue_empty(priv->tx_dmatsk))
724 msleep(100);
725
726 if (time_after_eq(jiffies, timeout))
727 dev_err(&dev->dev, "queues didn't drain\n");
728 #if 1
729 if (time_after_eq(jiffies, timeout)) {
730 dev_err(&dev->dev, " tx: index: %i, outdex: %i\n",
731 priv->tx_dmatsk->index,
732 priv->tx_dmatsk->outdex);
733 dev_err(&dev->dev, " rx: index: %i, outdex: %i\n",
734 priv->rx_dmatsk->index,
735 priv->rx_dmatsk->outdex);
736 }
737 #endif
738 }
739
740 bcom_disable(priv->tx_dmatsk);
741
742 /* Stop FEC */
743 out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
744 }
745
746 /* reset fec and bestcomm tasks */
747 static void mpc52xx_fec_reset(struct net_device *dev)
748 {
749 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
750 struct mpc52xx_fec __iomem *fec = priv->fec;
751
752 mpc52xx_fec_stop(dev);
753
754 out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
755 out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);
756
757 mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
758
759 mpc52xx_fec_hw_init(dev);
760
761 bcom_fec_rx_reset(priv->rx_dmatsk);
762 bcom_fec_tx_reset(priv->tx_dmatsk);
763
764 mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
765
766 bcom_enable(priv->rx_dmatsk);
767 bcom_enable(priv->tx_dmatsk);
768
769 mpc52xx_fec_start(dev);
770
771 netif_wake_queue(dev);
772 }
773
774
775 /* ethtool interface */
776 static void mpc52xx_fec_get_drvinfo(struct net_device *dev,
777 struct ethtool_drvinfo *info)
778 {
779 strcpy(info->driver, DRIVER_NAME);
780 }
781
782 static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
783 {
784 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
785
786 if (!priv->phydev)
787 return -ENODEV;
788
789 return phy_ethtool_gset(priv->phydev, cmd);
790 }
791
792 static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
793 {
794 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
795
796 if (!priv->phydev)
797 return -ENODEV;
798
799 return phy_ethtool_sset(priv->phydev, cmd);
800 }
801
802 static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
803 {
804 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
805 return priv->msg_enable;
806 }
807
808 static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
809 {
810 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
811 priv->msg_enable = level;
812 }
813
814 static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
815 .get_drvinfo = mpc52xx_fec_get_drvinfo,
816 .get_settings = mpc52xx_fec_get_settings,
817 .set_settings = mpc52xx_fec_set_settings,
818 .get_link = ethtool_op_get_link,
819 .get_msglevel = mpc52xx_fec_get_msglevel,
820 .set_msglevel = mpc52xx_fec_set_msglevel,
821 };
822
823
824 static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
825 {
826 struct mpc52xx_fec_priv *priv = netdev_priv(dev);
827
828 if (!priv->phydev)
829 return -ENOTSUPP;
830
831 return phy_mii_ioctl(priv->phydev, if_mii(rq), cmd);
832 }
833
834 static const struct net_device_ops mpc52xx_fec_netdev_ops = {
835 .ndo_open = mpc52xx_fec_open,
836 .ndo_stop = mpc52xx_fec_close,
837 .ndo_start_xmit = mpc52xx_fec_start_xmit,
838 .ndo_set_multicast_list = mpc52xx_fec_set_multicast_list,
839 .ndo_set_mac_address = mpc52xx_fec_set_mac_address,
840 .ndo_validate_addr = eth_validate_addr,
841 .ndo_do_ioctl = mpc52xx_fec_ioctl,
842 .ndo_change_mtu = eth_change_mtu,
843 .ndo_tx_timeout = mpc52xx_fec_tx_timeout,
844 .ndo_get_stats = mpc52xx_fec_get_stats,
845 #ifdef CONFIG_NET_POLL_CONTROLLER
846 .ndo_poll_controller = mpc52xx_fec_poll_controller,
847 #endif
848 };
849
850 /* ======================================================================== */
851 /* OF Driver */
852 /* ======================================================================== */
853
854 static int __devinit
855 mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
856 {
857 int rv;
858 struct net_device *ndev;
859 struct mpc52xx_fec_priv *priv = NULL;
860 struct resource mem;
861 const u32 *prop;
862 int prop_size;
863
864 phys_addr_t rx_fifo;
865 phys_addr_t tx_fifo;
866
867 /* Get the ether ndev & it's private zone */
868 ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
869 if (!ndev)
870 return -ENOMEM;
871
872 priv = netdev_priv(ndev);
873 priv->ndev = ndev;
874
875 /* Reserve FEC control zone */
876 rv = of_address_to_resource(op->node, 0, &mem);
877 if (rv) {
878 printk(KERN_ERR DRIVER_NAME ": "
879 "Error while parsing device node resource\n" );
880 return rv;
881 }
882 if ((mem.end - mem.start + 1) < sizeof(struct mpc52xx_fec)) {
883 printk(KERN_ERR DRIVER_NAME
884 " - invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
885 (unsigned long)(mem.end - mem.start + 1), sizeof(struct mpc52xx_fec));
886 return -EINVAL;
887 }
888
889 if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec), DRIVER_NAME))
890 return -EBUSY;
891
892 /* Init ether ndev with what we have */
893 ndev->netdev_ops = &mpc52xx_fec_netdev_ops;
894 ndev->ethtool_ops = &mpc52xx_fec_ethtool_ops;
895 ndev->watchdog_timeo = FEC_WATCHDOG_TIMEOUT;
896 ndev->base_addr = mem.start;
897 SET_NETDEV_DEV(ndev, &op->dev);
898
899 spin_lock_init(&priv->lock);
900
901 /* ioremap the zones */
902 priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));
903
904 if (!priv->fec) {
905 rv = -ENOMEM;
906 goto probe_error;
907 }
908
909 /* Bestcomm init */
910 rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
911 tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);
912
913 priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
914 priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);
915
916 if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
917 printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
918 rv = -ENOMEM;
919 goto probe_error;
920 }
921
922 /* Get the IRQ we need one by one */
923 /* Control */
924 ndev->irq = irq_of_parse_and_map(op->node, 0);
925
926 /* RX */
927 priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);
928
929 /* TX */
930 priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);
931
932 /* MAC address init */
933 if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
934 memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
935 else
936 mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);
937
938 priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
939
940 /*
941 * Link mode configuration
942 */
943
944 /* Start with safe defaults for link connection */
945 priv->speed = 100;
946 priv->duplex = DUPLEX_HALF;
947 priv->mdio_speed = ((mpc5xxx_get_bus_frequency(op->node) >> 20) / 5) << 1;
948
949 /* The current speed preconfigures the speed of the MII link */
950 prop = of_get_property(op->node, "current-speed", &prop_size);
951 if (prop && (prop_size >= sizeof(u32) * 2)) {
952 priv->speed = prop[0];
953 priv->duplex = prop[1] ? DUPLEX_FULL : DUPLEX_HALF;
954 }
955
956 /* If there is a phy handle, then get the PHY node */
957 priv->phy_node = of_parse_phandle(op->node, "phy-handle", 0);
958
959 /* the 7-wire property means don't use MII mode */
960 if (of_find_property(op->node, "fsl,7-wire-mode", NULL)) {
961 priv->seven_wire_mode = 1;
962 dev_info(&ndev->dev, "using 7-wire PHY mode\n");
963 }
964
965 /* Hardware init */
966 mpc52xx_fec_hw_init(ndev);
967 mpc52xx_fec_reset_stats(ndev);
968
969 rv = register_netdev(ndev);
970 if (rv < 0)
971 goto probe_error;
972
973 /* We're done ! */
974 dev_set_drvdata(&op->dev, ndev);
975
976 return 0;
977
978
979 /* Error handling - free everything that might be allocated */
980 probe_error:
981
982 if (priv->phy_node)
983 of_node_put(priv->phy_node);
984 priv->phy_node = NULL;
985
986 irq_dispose_mapping(ndev->irq);
987
988 if (priv->rx_dmatsk)
989 bcom_fec_rx_release(priv->rx_dmatsk);
990 if (priv->tx_dmatsk)
991 bcom_fec_tx_release(priv->tx_dmatsk);
992
993 if (priv->fec)
994 iounmap(priv->fec);
995
996 release_mem_region(mem.start, sizeof(struct mpc52xx_fec));
997
998 free_netdev(ndev);
999
1000 return rv;
1001 }
1002
1003 static int
1004 mpc52xx_fec_remove(struct of_device *op)
1005 {
1006 struct net_device *ndev;
1007 struct mpc52xx_fec_priv *priv;
1008
1009 ndev = dev_get_drvdata(&op->dev);
1010 priv = netdev_priv(ndev);
1011
1012 unregister_netdev(ndev);
1013
1014 if (priv->phy_node)
1015 of_node_put(priv->phy_node);
1016 priv->phy_node = NULL;
1017
1018 irq_dispose_mapping(ndev->irq);
1019
1020 bcom_fec_rx_release(priv->rx_dmatsk);
1021 bcom_fec_tx_release(priv->tx_dmatsk);
1022
1023 iounmap(priv->fec);
1024
1025 release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));
1026
1027 free_netdev(ndev);
1028
1029 dev_set_drvdata(&op->dev, NULL);
1030 return 0;
1031 }
1032
1033 #ifdef CONFIG_PM
1034 static int mpc52xx_fec_of_suspend(struct of_device *op, pm_message_t state)
1035 {
1036 struct net_device *dev = dev_get_drvdata(&op->dev);
1037
1038 if (netif_running(dev))
1039 mpc52xx_fec_close(dev);
1040
1041 return 0;
1042 }
1043
1044 static int mpc52xx_fec_of_resume(struct of_device *op)
1045 {
1046 struct net_device *dev = dev_get_drvdata(&op->dev);
1047
1048 mpc52xx_fec_hw_init(dev);
1049 mpc52xx_fec_reset_stats(dev);
1050
1051 if (netif_running(dev))
1052 mpc52xx_fec_open(dev);
1053
1054 return 0;
1055 }
1056 #endif
1057
1058 static struct of_device_id mpc52xx_fec_match[] = {
1059 { .compatible = "fsl,mpc5200b-fec", },
1060 { .compatible = "fsl,mpc5200-fec", },
1061 { .compatible = "mpc5200-fec", },
1062 { }
1063 };
1064
1065 MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);
1066
1067 static struct of_platform_driver mpc52xx_fec_driver = {
1068 .owner = THIS_MODULE,
1069 .name = DRIVER_NAME,
1070 .match_table = mpc52xx_fec_match,
1071 .probe = mpc52xx_fec_probe,
1072 .remove = mpc52xx_fec_remove,
1073 #ifdef CONFIG_PM
1074 .suspend = mpc52xx_fec_of_suspend,
1075 .resume = mpc52xx_fec_of_resume,
1076 #endif
1077 };
1078
1079
1080 /* ======================================================================== */
1081 /* Module */
1082 /* ======================================================================== */
1083
1084 static int __init
1085 mpc52xx_fec_init(void)
1086 {
1087 #ifdef CONFIG_FEC_MPC52xx_MDIO
1088 int ret;
1089 ret = of_register_platform_driver(&mpc52xx_fec_mdio_driver);
1090 if (ret) {
1091 printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
1092 return ret;
1093 }
1094 #endif
1095 return of_register_platform_driver(&mpc52xx_fec_driver);
1096 }
1097
1098 static void __exit
1099 mpc52xx_fec_exit(void)
1100 {
1101 of_unregister_platform_driver(&mpc52xx_fec_driver);
1102 #ifdef CONFIG_FEC_MPC52xx_MDIO
1103 of_unregister_platform_driver(&mpc52xx_fec_mdio_driver);
1104 #endif
1105 }
1106
1107
1108 module_init(mpc52xx_fec_init);
1109 module_exit(mpc52xx_fec_exit);
1110
1111 MODULE_LICENSE("GPL");
1112 MODULE_AUTHOR("Dale Farnsworth");
1113 MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");
Linux with added FPC-III support