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1/*
2 * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
3 *
4 * Copyright (c) 2003 Intracom S.A.
5 * by Pantelis Antoniou <panto@intracom.gr>
6 *
7 * 2005 (c) MontaVista Software, Inc.
8 * Vitaly Bordug <vbordug@ru.mvista.com>
9 *
10 * Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
11 * and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
12 *
13 * This file is licensed under the terms of the GNU General Public License
14 * version 2. This program is licensed "as is" without any warranty of any
15 * kind, whether express or implied.
16 */
17
18#include <linux/module.h>
19#include <linux/kernel.h>
20#include <linux/types.h>
21#include <linux/string.h>
22#include <linux/ptrace.h>
23#include <linux/errno.h>
24#include <linux/ioport.h>
25#include <linux/slab.h>
26#include <linux/interrupt.h>
27#include <linux/delay.h>
28#include <linux/netdevice.h>
29#include <linux/etherdevice.h>
30#include <linux/skbuff.h>
31#include <linux/spinlock.h>
32#include <linux/mii.h>
33#include <linux/ethtool.h>
34#include <linux/bitops.h>
35#include <linux/fs.h>
36#include <linux/platform_device.h>
37#include <linux/phy.h>
38#include <linux/of.h>
39#include <linux/of_mdio.h>
40#include <linux/of_platform.h>
41#include <linux/of_gpio.h>
42#include <linux/of_net.h>
43
44#include <linux/vmalloc.h>
45#include <asm/pgtable.h>
46#include <asm/irq.h>
47#include <asm/uaccess.h>
48
49#include "fs_enet.h"
50
51/*************************************************/
52
53MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
54MODULE_DESCRIPTION("Freescale Ethernet Driver");
55MODULE_LICENSE("GPL");
56MODULE_VERSION(DRV_MODULE_VERSION);
57
58static int fs_enet_debug = -1; /* -1 == use FS_ENET_DEF_MSG_ENABLE as value */
59module_param(fs_enet_debug, int, 0);
60MODULE_PARM_DESC(fs_enet_debug,
61 "Freescale bitmapped debugging message enable value");
62
63#ifdef CONFIG_NET_POLL_CONTROLLER
64static void fs_enet_netpoll(struct net_device *dev);
65#endif
66
67static void fs_set_multicast_list(struct net_device *dev)
68{
69 struct fs_enet_private *fep = netdev_priv(dev);
70
71 (*fep->ops->set_multicast_list)(dev);
72}
73
74static void skb_align(struct sk_buff *skb, int align)
75{
76 int off = ((unsigned long)skb->data) & (align - 1);
77
78 if (off)
79 skb_reserve(skb, align - off);
80}
81
82/* NAPI receive function */
83static int fs_enet_rx_napi(struct napi_struct *napi, int budget)
84{
85 struct fs_enet_private *fep = container_of(napi, struct fs_enet_private, napi);
86 struct net_device *dev = fep->ndev;
87 const struct fs_platform_info *fpi = fep->fpi;
88 cbd_t __iomem *bdp;
89 struct sk_buff *skb, *skbn, *skbt;
90 int received = 0;
91 u16 pkt_len, sc;
92 int curidx;
93
94 if (budget <= 0)
95 return received;
96
97 /*
98 * First, grab all of the stats for the incoming packet.
99 * These get messed up if we get called due to a busy condition.
100 */
101 bdp = fep->cur_rx;
102
103 /* clear RX status bits for napi*/
104 (*fep->ops->napi_clear_rx_event)(dev);
105
106 while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
107 curidx = bdp - fep->rx_bd_base;
108
109 /*
110 * Since we have allocated space to hold a complete frame,
111 * the last indicator should be set.
112 */
113 if ((sc & BD_ENET_RX_LAST) == 0)
114 dev_warn(fep->dev, "rcv is not +last\n");
115
116 /*
117 * Check for errors.
118 */
119 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
120 BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
121 fep->stats.rx_errors++;
122 /* Frame too long or too short. */
123 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
124 fep->stats.rx_length_errors++;
125 /* Frame alignment */
126 if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
127 fep->stats.rx_frame_errors++;
128 /* CRC Error */
129 if (sc & BD_ENET_RX_CR)
130 fep->stats.rx_crc_errors++;
131 /* FIFO overrun */
132 if (sc & BD_ENET_RX_OV)
133 fep->stats.rx_crc_errors++;
134
135 skb = fep->rx_skbuff[curidx];
136
137 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
138 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
139 DMA_FROM_DEVICE);
140
141 skbn = skb;
142
143 } else {
144 skb = fep->rx_skbuff[curidx];
145
146 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
147 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
148 DMA_FROM_DEVICE);
149
150 /*
151 * Process the incoming frame.
152 */
153 fep->stats.rx_packets++;
154 pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
155 fep->stats.rx_bytes += pkt_len + 4;
156
157 if (pkt_len <= fpi->rx_copybreak) {
158 /* +2 to make IP header L1 cache aligned */
159 skbn = netdev_alloc_skb(dev, pkt_len + 2);
160 if (skbn != NULL) {
161 skb_reserve(skbn, 2); /* align IP header */
162 skb_copy_from_linear_data(skb,
163 skbn->data, pkt_len);
164 /* swap */
165 skbt = skb;
166 skb = skbn;
167 skbn = skbt;
168 }
169 } else {
170 skbn = netdev_alloc_skb(dev, ENET_RX_FRSIZE);
171
172 if (skbn)
173 skb_align(skbn, ENET_RX_ALIGN);
174 }
175
176 if (skbn != NULL) {
177 skb_put(skb, pkt_len); /* Make room */
178 skb->protocol = eth_type_trans(skb, dev);
179 received++;
180 netif_receive_skb(skb);
181 } else {
182 fep->stats.rx_dropped++;
183 skbn = skb;
184 }
185 }
186
187 fep->rx_skbuff[curidx] = skbn;
188 CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
189 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
190 DMA_FROM_DEVICE));
191 CBDW_DATLEN(bdp, 0);
192 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
193
194 /*
195 * Update BD pointer to next entry.
196 */
197 if ((sc & BD_ENET_RX_WRAP) == 0)
198 bdp++;
199 else
200 bdp = fep->rx_bd_base;
201
202 (*fep->ops->rx_bd_done)(dev);
203
204 if (received >= budget)
205 break;
206 }
207
208 fep->cur_rx = bdp;
209
210 if (received < budget) {
211 /* done */
212 napi_complete(napi);
213 (*fep->ops->napi_enable_rx)(dev);
214 }
215 return received;
216}
217
218/* non NAPI receive function */
219static int fs_enet_rx_non_napi(struct net_device *dev)
220{
221 struct fs_enet_private *fep = netdev_priv(dev);
222 const struct fs_platform_info *fpi = fep->fpi;
223 cbd_t __iomem *bdp;
224 struct sk_buff *skb, *skbn, *skbt;
225 int received = 0;
226 u16 pkt_len, sc;
227 int curidx;
228 /*
229 * First, grab all of the stats for the incoming packet.
230 * These get messed up if we get called due to a busy condition.
231 */
232 bdp = fep->cur_rx;
233
234 while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
235
236 curidx = bdp - fep->rx_bd_base;
237
238 /*
239 * Since we have allocated space to hold a complete frame,
240 * the last indicator should be set.
241 */
242 if ((sc & BD_ENET_RX_LAST) == 0)
243 dev_warn(fep->dev, "rcv is not +last\n");
244
245 /*
246 * Check for errors.
247 */
248 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
249 BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
250 fep->stats.rx_errors++;
251 /* Frame too long or too short. */
252 if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
253 fep->stats.rx_length_errors++;
254 /* Frame alignment */
255 if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
256 fep->stats.rx_frame_errors++;
257 /* CRC Error */
258 if (sc & BD_ENET_RX_CR)
259 fep->stats.rx_crc_errors++;
260 /* FIFO overrun */
261 if (sc & BD_ENET_RX_OV)
262 fep->stats.rx_crc_errors++;
263
264 skb = fep->rx_skbuff[curidx];
265
266 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
267 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
268 DMA_FROM_DEVICE);
269
270 skbn = skb;
271
272 } else {
273
274 skb = fep->rx_skbuff[curidx];
275
276 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
277 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
278 DMA_FROM_DEVICE);
279
280 /*
281 * Process the incoming frame.
282 */
283 fep->stats.rx_packets++;
284 pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
285 fep->stats.rx_bytes += pkt_len + 4;
286
287 if (pkt_len <= fpi->rx_copybreak) {
288 /* +2 to make IP header L1 cache aligned */
289 skbn = netdev_alloc_skb(dev, pkt_len + 2);
290 if (skbn != NULL) {
291 skb_reserve(skbn, 2); /* align IP header */
292 skb_copy_from_linear_data(skb,
293 skbn->data, pkt_len);
294 /* swap */
295 skbt = skb;
296 skb = skbn;
297 skbn = skbt;
298 }
299 } else {
300 skbn = netdev_alloc_skb(dev, ENET_RX_FRSIZE);
301
302 if (skbn)
303 skb_align(skbn, ENET_RX_ALIGN);
304 }
305
306 if (skbn != NULL) {
307 skb_put(skb, pkt_len); /* Make room */
308 skb->protocol = eth_type_trans(skb, dev);
309 received++;
310 netif_rx(skb);
311 } else {
312 fep->stats.rx_dropped++;
313 skbn = skb;
314 }
315 }
316
317 fep->rx_skbuff[curidx] = skbn;
318 CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
319 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
320 DMA_FROM_DEVICE));
321 CBDW_DATLEN(bdp, 0);
322 CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
323
324 /*
325 * Update BD pointer to next entry.
326 */
327 if ((sc & BD_ENET_RX_WRAP) == 0)
328 bdp++;
329 else
330 bdp = fep->rx_bd_base;
331
332 (*fep->ops->rx_bd_done)(dev);
333 }
334
335 fep->cur_rx = bdp;
336
337 return 0;
338}
339
340static void fs_enet_tx(struct net_device *dev)
341{
342 struct fs_enet_private *fep = netdev_priv(dev);
343 cbd_t __iomem *bdp;
344 struct sk_buff *skb;
345 int dirtyidx, do_wake, do_restart;
346 u16 sc;
347
348 spin_lock(&fep->tx_lock);
349 bdp = fep->dirty_tx;
350
351 do_wake = do_restart = 0;
352 while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0) {
353 dirtyidx = bdp - fep->tx_bd_base;
354
355 if (fep->tx_free == fep->tx_ring)
356 break;
357
358 skb = fep->tx_skbuff[dirtyidx];
359
360 /*
361 * Check for errors.
362 */
363 if (sc & (BD_ENET_TX_HB | BD_ENET_TX_LC |
364 BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) {
365
366 if (sc & BD_ENET_TX_HB) /* No heartbeat */
367 fep->stats.tx_heartbeat_errors++;
368 if (sc & BD_ENET_TX_LC) /* Late collision */
369 fep->stats.tx_window_errors++;
370 if (sc & BD_ENET_TX_RL) /* Retrans limit */
371 fep->stats.tx_aborted_errors++;
372 if (sc & BD_ENET_TX_UN) /* Underrun */
373 fep->stats.tx_fifo_errors++;
374 if (sc & BD_ENET_TX_CSL) /* Carrier lost */
375 fep->stats.tx_carrier_errors++;
376
377 if (sc & (BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {
378 fep->stats.tx_errors++;
379 do_restart = 1;
380 }
381 } else
382 fep->stats.tx_packets++;
383
384 if (sc & BD_ENET_TX_READY) {
385 dev_warn(fep->dev,
386 "HEY! Enet xmit interrupt and TX_READY.\n");
387 }
388
389 /*
390 * Deferred means some collisions occurred during transmit,
391 * but we eventually sent the packet OK.
392 */
393 if (sc & BD_ENET_TX_DEF)
394 fep->stats.collisions++;
395
396 /* unmap */
397 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
398 skb->len, DMA_TO_DEVICE);
399
400 /*
401 * Free the sk buffer associated with this last transmit.
402 */
403 dev_kfree_skb_irq(skb);
404 fep->tx_skbuff[dirtyidx] = NULL;
405
406 /*
407 * Update pointer to next buffer descriptor to be transmitted.
408 */
409 if ((sc & BD_ENET_TX_WRAP) == 0)
410 bdp++;
411 else
412 bdp = fep->tx_bd_base;
413
414 /*
415 * Since we have freed up a buffer, the ring is no longer
416 * full.
417 */
418 if (!fep->tx_free++)
419 do_wake = 1;
420 }
421
422 fep->dirty_tx = bdp;
423
424 if (do_restart)
425 (*fep->ops->tx_restart)(dev);
426
427 spin_unlock(&fep->tx_lock);
428
429 if (do_wake)
430 netif_wake_queue(dev);
431}
432
433/*
434 * The interrupt handler.
435 * This is called from the MPC core interrupt.
436 */
437static irqreturn_t
438fs_enet_interrupt(int irq, void *dev_id)
439{
440 struct net_device *dev = dev_id;
441 struct fs_enet_private *fep;
442 const struct fs_platform_info *fpi;
443 u32 int_events;
444 u32 int_clr_events;
445 int nr, napi_ok;
446 int handled;
447
448 fep = netdev_priv(dev);
449 fpi = fep->fpi;
450
451 nr = 0;
452 while ((int_events = (*fep->ops->get_int_events)(dev)) != 0) {
453 nr++;
454
455 int_clr_events = int_events;
456 if (fpi->use_napi)
457 int_clr_events &= ~fep->ev_napi_rx;
458
459 (*fep->ops->clear_int_events)(dev, int_clr_events);
460
461 if (int_events & fep->ev_err)
462 (*fep->ops->ev_error)(dev, int_events);
463
464 if (int_events & fep->ev_rx) {
465 if (!fpi->use_napi)
466 fs_enet_rx_non_napi(dev);
467 else {
468 napi_ok = napi_schedule_prep(&fep->napi);
469
470 (*fep->ops->napi_disable_rx)(dev);
471 (*fep->ops->clear_int_events)(dev, fep->ev_napi_rx);
472
473 /* NOTE: it is possible for FCCs in NAPI mode */
474 /* to submit a spurious interrupt while in poll */
475 if (napi_ok)
476 __napi_schedule(&fep->napi);
477 }
478 }
479
480 if (int_events & fep->ev_tx)
481 fs_enet_tx(dev);
482 }
483
484 handled = nr > 0;
485 return IRQ_RETVAL(handled);
486}
487
488void fs_init_bds(struct net_device *dev)
489{
490 struct fs_enet_private *fep = netdev_priv(dev);
491 cbd_t __iomem *bdp;
492 struct sk_buff *skb;
493 int i;
494
495 fs_cleanup_bds(dev);
496
497 fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
498 fep->tx_free = fep->tx_ring;
499 fep->cur_rx = fep->rx_bd_base;
500
501 /*
502 * Initialize the receive buffer descriptors.
503 */
504 for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
505 skb = netdev_alloc_skb(dev, ENET_RX_FRSIZE);
506 if (skb == NULL)
507 break;
508
509 skb_align(skb, ENET_RX_ALIGN);
510 fep->rx_skbuff[i] = skb;
511 CBDW_BUFADDR(bdp,
512 dma_map_single(fep->dev, skb->data,
513 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
514 DMA_FROM_DEVICE));
515 CBDW_DATLEN(bdp, 0); /* zero */
516 CBDW_SC(bdp, BD_ENET_RX_EMPTY |
517 ((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
518 }
519 /*
520 * if we failed, fillup remainder
521 */
522 for (; i < fep->rx_ring; i++, bdp++) {
523 fep->rx_skbuff[i] = NULL;
524 CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
525 }
526
527 /*
528 * ...and the same for transmit.
529 */
530 for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
531 fep->tx_skbuff[i] = NULL;
532 CBDW_BUFADDR(bdp, 0);
533 CBDW_DATLEN(bdp, 0);
534 CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
535 }
536}
537
538void fs_cleanup_bds(struct net_device *dev)
539{
540 struct fs_enet_private *fep = netdev_priv(dev);
541 struct sk_buff *skb;
542 cbd_t __iomem *bdp;
543 int i;
544
545 /*
546 * Reset SKB transmit buffers.
547 */
548 for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
549 if ((skb = fep->tx_skbuff[i]) == NULL)
550 continue;
551
552 /* unmap */
553 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
554 skb->len, DMA_TO_DEVICE);
555
556 fep->tx_skbuff[i] = NULL;
557 dev_kfree_skb(skb);
558 }
559
560 /*
561 * Reset SKB receive buffers
562 */
563 for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
564 if ((skb = fep->rx_skbuff[i]) == NULL)
565 continue;
566
567 /* unmap */
568 dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
569 L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
570 DMA_FROM_DEVICE);
571
572 fep->rx_skbuff[i] = NULL;
573
574 dev_kfree_skb(skb);
575 }
576}
577
578/**********************************************************************************/
579
580#ifdef CONFIG_FS_ENET_MPC5121_FEC
581/*
582 * MPC5121 FEC requeries 4-byte alignment for TX data buffer!
583 */
584static struct sk_buff *tx_skb_align_workaround(struct net_device *dev,
585 struct sk_buff *skb)
586{
587 struct sk_buff *new_skb;
588
589 /* Alloc new skb */
590 new_skb = netdev_alloc_skb(dev, skb->len + 4);
591 if (!new_skb)
592 return NULL;
593
594 /* Make sure new skb is properly aligned */
595 skb_align(new_skb, 4);
596
597 /* Copy data to new skb ... */
598 skb_copy_from_linear_data(skb, new_skb->data, skb->len);
599 skb_put(new_skb, skb->len);
600
601 /* ... and free an old one */
602 dev_kfree_skb_any(skb);
603
604 return new_skb;
605}
606#endif
607
608static int fs_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
609{
610 struct fs_enet_private *fep = netdev_priv(dev);
611 cbd_t __iomem *bdp;
612 int curidx;
613 u16 sc;
614 unsigned long flags;
615
616#ifdef CONFIG_FS_ENET_MPC5121_FEC
617 if (((unsigned long)skb->data) & 0x3) {
618 skb = tx_skb_align_workaround(dev, skb);
619 if (!skb) {
620 /*
621 * We have lost packet due to memory allocation error
622 * in tx_skb_align_workaround(). Hopefully original
623 * skb is still valid, so try transmit it later.
624 */
625 return NETDEV_TX_BUSY;
626 }
627 }
628#endif
629 spin_lock_irqsave(&fep->tx_lock, flags);
630
631 /*
632 * Fill in a Tx ring entry
633 */
634 bdp = fep->cur_tx;
635
636 if (!fep->tx_free || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
637 netif_stop_queue(dev);
638 spin_unlock_irqrestore(&fep->tx_lock, flags);
639
640 /*
641 * Ooops. All transmit buffers are full. Bail out.
642 * This should not happen, since the tx queue should be stopped.
643 */
644 dev_warn(fep->dev, "tx queue full!.\n");
645 return NETDEV_TX_BUSY;
646 }
647
648 curidx = bdp - fep->tx_bd_base;
649 /*
650 * Clear all of the status flags.
651 */
652 CBDC_SC(bdp, BD_ENET_TX_STATS);
653
654 /*
655 * Save skb pointer.
656 */
657 fep->tx_skbuff[curidx] = skb;
658
659 fep->stats.tx_bytes += skb->len;
660
661 /*
662 * Push the data cache so the CPM does not get stale memory data.
663 */
664 CBDW_BUFADDR(bdp, dma_map_single(fep->dev,
665 skb->data, skb->len, DMA_TO_DEVICE));
666 CBDW_DATLEN(bdp, skb->len);
667
668 /*
669 * If this was the last BD in the ring, start at the beginning again.
670 */
671 if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
672 fep->cur_tx++;
673 else
674 fep->cur_tx = fep->tx_bd_base;
675
676 if (!--fep->tx_free)
677 netif_stop_queue(dev);
678
679 /* Trigger transmission start */
680 sc = BD_ENET_TX_READY | BD_ENET_TX_INTR |
681 BD_ENET_TX_LAST | BD_ENET_TX_TC;
682
683 /* note that while FEC does not have this bit
684 * it marks it as available for software use
685 * yay for hw reuse :) */
686 if (skb->len <= 60)
687 sc |= BD_ENET_TX_PAD;
688 CBDS_SC(bdp, sc);
689
690 skb_tx_timestamp(skb);
691
692 (*fep->ops->tx_kickstart)(dev);
693
694 spin_unlock_irqrestore(&fep->tx_lock, flags);
695
696 return NETDEV_TX_OK;
697}
698
699static void fs_timeout(struct net_device *dev)
700{
701 struct fs_enet_private *fep = netdev_priv(dev);
702 unsigned long flags;
703 int wake = 0;
704
705 fep->stats.tx_errors++;
706
707 spin_lock_irqsave(&fep->lock, flags);
708
709 if (dev->flags & IFF_UP) {
710 phy_stop(fep->phydev);
711 (*fep->ops->stop)(dev);
712 (*fep->ops->restart)(dev);
713 phy_start(fep->phydev);
714 }
715
716 phy_start(fep->phydev);
717 wake = fep->tx_free && !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
718 spin_unlock_irqrestore(&fep->lock, flags);
719
720 if (wake)
721 netif_wake_queue(dev);
722}
723
724/*-----------------------------------------------------------------------------
725 * generic link-change handler - should be sufficient for most cases
726 *-----------------------------------------------------------------------------*/
727static void generic_adjust_link(struct net_device *dev)
728{
729 struct fs_enet_private *fep = netdev_priv(dev);
730 struct phy_device *phydev = fep->phydev;
731 int new_state = 0;
732
733 if (phydev->link) {
734 /* adjust to duplex mode */
735 if (phydev->duplex != fep->oldduplex) {
736 new_state = 1;
737 fep->oldduplex = phydev->duplex;
738 }
739
740 if (phydev->speed != fep->oldspeed) {
741 new_state = 1;
742 fep->oldspeed = phydev->speed;
743 }
744
745 if (!fep->oldlink) {
746 new_state = 1;
747 fep->oldlink = 1;
748 }
749
750 if (new_state)
751 fep->ops->restart(dev);
752 } else if (fep->oldlink) {
753 new_state = 1;
754 fep->oldlink = 0;
755 fep->oldspeed = 0;
756 fep->oldduplex = -1;
757 }
758
759 if (new_state && netif_msg_link(fep))
760 phy_print_status(phydev);
761}
762
763
764static void fs_adjust_link(struct net_device *dev)
765{
766 struct fs_enet_private *fep = netdev_priv(dev);
767 unsigned long flags;
768
769 spin_lock_irqsave(&fep->lock, flags);
770
771 if(fep->ops->adjust_link)
772 fep->ops->adjust_link(dev);
773 else
774 generic_adjust_link(dev);
775
776 spin_unlock_irqrestore(&fep->lock, flags);
777}
778
779static int fs_init_phy(struct net_device *dev)
780{
781 struct fs_enet_private *fep = netdev_priv(dev);
782 struct phy_device *phydev;
783 phy_interface_t iface;
784
785 fep->oldlink = 0;
786 fep->oldspeed = 0;
787 fep->oldduplex = -1;
788
789 iface = fep->fpi->use_rmii ?
790 PHY_INTERFACE_MODE_RMII : PHY_INTERFACE_MODE_MII;
791
792 phydev = of_phy_connect(dev, fep->fpi->phy_node, &fs_adjust_link, 0,
793 iface);
794 if (!phydev) {
795 phydev = of_phy_connect_fixed_link(dev, &fs_adjust_link,
796 iface);
797 }
798 if (!phydev) {
799 dev_err(&dev->dev, "Could not attach to PHY\n");
800 return -ENODEV;
801 }
802
803 fep->phydev = phydev;
804
805 return 0;
806}
807
808static int fs_enet_open(struct net_device *dev)
809{
810 struct fs_enet_private *fep = netdev_priv(dev);
811 int r;
812 int err;
813
814 /* to initialize the fep->cur_rx,... */
815 /* not doing this, will cause a crash in fs_enet_rx_napi */
816 fs_init_bds(fep->ndev);
817
818 if (fep->fpi->use_napi)
819 napi_enable(&fep->napi);
820
821 /* Install our interrupt handler. */
822 r = request_irq(fep->interrupt, fs_enet_interrupt, IRQF_SHARED,
823 "fs_enet-mac", dev);
824 if (r != 0) {
825 dev_err(fep->dev, "Could not allocate FS_ENET IRQ!");
826 if (fep->fpi->use_napi)
827 napi_disable(&fep->napi);
828 return -EINVAL;
829 }
830
831 err = fs_init_phy(dev);
832 if (err) {
833 free_irq(fep->interrupt, dev);
834 if (fep->fpi->use_napi)
835 napi_disable(&fep->napi);
836 return err;
837 }
838 phy_start(fep->phydev);
839
840 netif_start_queue(dev);
841
842 return 0;
843}
844
845static int fs_enet_close(struct net_device *dev)
846{
847 struct fs_enet_private *fep = netdev_priv(dev);
848 unsigned long flags;
849
850 netif_stop_queue(dev);
851 netif_carrier_off(dev);
852 if (fep->fpi->use_napi)
853 napi_disable(&fep->napi);
854 phy_stop(fep->phydev);
855
856 spin_lock_irqsave(&fep->lock, flags);
857 spin_lock(&fep->tx_lock);
858 (*fep->ops->stop)(dev);
859 spin_unlock(&fep->tx_lock);
860 spin_unlock_irqrestore(&fep->lock, flags);
861
862 /* release any irqs */
863 phy_disconnect(fep->phydev);
864 fep->phydev = NULL;
865 free_irq(fep->interrupt, dev);
866
867 return 0;
868}
869
870static struct net_device_stats *fs_enet_get_stats(struct net_device *dev)
871{
872 struct fs_enet_private *fep = netdev_priv(dev);
873 return &fep->stats;
874}
875
876/*************************************************************************/
877
878static void fs_get_drvinfo(struct net_device *dev,
879 struct ethtool_drvinfo *info)
880{
881 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
882 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
883}
884
885static int fs_get_regs_len(struct net_device *dev)
886{
887 struct fs_enet_private *fep = netdev_priv(dev);
888
889 return (*fep->ops->get_regs_len)(dev);
890}
891
892static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
893 void *p)
894{
895 struct fs_enet_private *fep = netdev_priv(dev);
896 unsigned long flags;
897 int r, len;
898
899 len = regs->len;
900
901 spin_lock_irqsave(&fep->lock, flags);
902 r = (*fep->ops->get_regs)(dev, p, &len);
903 spin_unlock_irqrestore(&fep->lock, flags);
904
905 if (r == 0)
906 regs->version = 0;
907}
908
909static int fs_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
910{
911 struct fs_enet_private *fep = netdev_priv(dev);
912
913 if (!fep->phydev)
914 return -ENODEV;
915
916 return phy_ethtool_gset(fep->phydev, cmd);
917}
918
919static int fs_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
920{
921 struct fs_enet_private *fep = netdev_priv(dev);
922
923 if (!fep->phydev)
924 return -ENODEV;
925
926 return phy_ethtool_sset(fep->phydev, cmd);
927}
928
929static int fs_nway_reset(struct net_device *dev)
930{
931 return 0;
932}
933
934static u32 fs_get_msglevel(struct net_device *dev)
935{
936 struct fs_enet_private *fep = netdev_priv(dev);
937 return fep->msg_enable;
938}
939
940static void fs_set_msglevel(struct net_device *dev, u32 value)
941{
942 struct fs_enet_private *fep = netdev_priv(dev);
943 fep->msg_enable = value;
944}
945
946static const struct ethtool_ops fs_ethtool_ops = {
947 .get_drvinfo = fs_get_drvinfo,
948 .get_regs_len = fs_get_regs_len,
949 .get_settings = fs_get_settings,
950 .set_settings = fs_set_settings,
951 .nway_reset = fs_nway_reset,
952 .get_link = ethtool_op_get_link,
953 .get_msglevel = fs_get_msglevel,
954 .set_msglevel = fs_set_msglevel,
955 .get_regs = fs_get_regs,
956 .get_ts_info = ethtool_op_get_ts_info,
957};
958
959static int fs_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
960{
961 struct fs_enet_private *fep = netdev_priv(dev);
962
963 if (!netif_running(dev))
964 return -EINVAL;
965
966 return phy_mii_ioctl(fep->phydev, rq, cmd);
967}
968
969extern int fs_mii_connect(struct net_device *dev);
970extern void fs_mii_disconnect(struct net_device *dev);
971
972/**************************************************************************************/
973
974#ifdef CONFIG_FS_ENET_HAS_FEC
975#define IS_FEC(match) ((match)->data == &fs_fec_ops)
976#else
977#define IS_FEC(match) 0
978#endif
979
980static const struct net_device_ops fs_enet_netdev_ops = {
981 .ndo_open = fs_enet_open,
982 .ndo_stop = fs_enet_close,
983 .ndo_get_stats = fs_enet_get_stats,
984 .ndo_start_xmit = fs_enet_start_xmit,
985 .ndo_tx_timeout = fs_timeout,
986 .ndo_set_rx_mode = fs_set_multicast_list,
987 .ndo_do_ioctl = fs_ioctl,
988 .ndo_validate_addr = eth_validate_addr,
989 .ndo_set_mac_address = eth_mac_addr,
990 .ndo_change_mtu = eth_change_mtu,
991#ifdef CONFIG_NET_POLL_CONTROLLER
992 .ndo_poll_controller = fs_enet_netpoll,
993#endif
994};
995
996static struct of_device_id fs_enet_match[];
997static int fs_enet_probe(struct platform_device *ofdev)
998{
999 const struct of_device_id *match;
1000 struct net_device *ndev;
1001 struct fs_enet_private *fep;
1002 struct fs_platform_info *fpi;
1003 const u32 *data;
1004 struct clk *clk;
1005 int err;
1006 const u8 *mac_addr;
1007 const char *phy_connection_type;
1008 int privsize, len, ret = -ENODEV;
1009
1010 match = of_match_device(fs_enet_match, &ofdev->dev);
1011 if (!match)
1012 return -EINVAL;
1013
1014 fpi = kzalloc(sizeof(*fpi), GFP_KERNEL);
1015 if (!fpi)
1016 return -ENOMEM;
1017
1018 if (!IS_FEC(match)) {
1019 data = of_get_property(ofdev->dev.of_node, "fsl,cpm-command", &len);
1020 if (!data || len != 4)
1021 goto out_free_fpi;
1022
1023 fpi->cp_command = *data;
1024 }
1025
1026 fpi->rx_ring = 32;
1027 fpi->tx_ring = 32;
1028 fpi->rx_copybreak = 240;
1029 fpi->use_napi = 1;
1030 fpi->napi_weight = 17;
1031 fpi->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
1032 if ((!fpi->phy_node) && (!of_get_property(ofdev->dev.of_node, "fixed-link",
1033 NULL)))
1034 goto out_free_fpi;
1035
1036 if (of_device_is_compatible(ofdev->dev.of_node, "fsl,mpc5125-fec")) {
1037 phy_connection_type = of_get_property(ofdev->dev.of_node,
1038 "phy-connection-type", NULL);
1039 if (phy_connection_type && !strcmp("rmii", phy_connection_type))
1040 fpi->use_rmii = 1;
1041 }
1042
1043 /* make clock lookup non-fatal (the driver is shared among platforms),
1044 * but require enable to succeed when a clock was specified/found,
1045 * keep a reference to the clock upon successful acquisition
1046 */
1047 clk = devm_clk_get(&ofdev->dev, "per");
1048 if (!IS_ERR(clk)) {
1049 err = clk_prepare_enable(clk);
1050 if (err) {
1051 ret = err;
1052 goto out_free_fpi;
1053 }
1054 fpi->clk_per = clk;
1055 }
1056
1057 privsize = sizeof(*fep) +
1058 sizeof(struct sk_buff **) *
1059 (fpi->rx_ring + fpi->tx_ring);
1060
1061 ndev = alloc_etherdev(privsize);
1062 if (!ndev) {
1063 ret = -ENOMEM;
1064 goto out_put;
1065 }
1066
1067 SET_NETDEV_DEV(ndev, &ofdev->dev);
1068 platform_set_drvdata(ofdev, ndev);
1069
1070 fep = netdev_priv(ndev);
1071 fep->dev = &ofdev->dev;
1072 fep->ndev = ndev;
1073 fep->fpi = fpi;
1074 fep->ops = match->data;
1075
1076 ret = fep->ops->setup_data(ndev);
1077 if (ret)
1078 goto out_free_dev;
1079
1080 fep->rx_skbuff = (struct sk_buff **)&fep[1];
1081 fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
1082
1083 spin_lock_init(&fep->lock);
1084 spin_lock_init(&fep->tx_lock);
1085
1086 mac_addr = of_get_mac_address(ofdev->dev.of_node);
1087 if (mac_addr)
1088 memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
1089
1090 ret = fep->ops->allocate_bd(ndev);
1091 if (ret)
1092 goto out_cleanup_data;
1093
1094 fep->rx_bd_base = fep->ring_base;
1095 fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
1096
1097 fep->tx_ring = fpi->tx_ring;
1098 fep->rx_ring = fpi->rx_ring;
1099
1100 ndev->netdev_ops = &fs_enet_netdev_ops;
1101 ndev->watchdog_timeo = 2 * HZ;
1102 if (fpi->use_napi)
1103 netif_napi_add(ndev, &fep->napi, fs_enet_rx_napi,
1104 fpi->napi_weight);
1105
1106 ndev->ethtool_ops = &fs_ethtool_ops;
1107
1108 init_timer(&fep->phy_timer_list);
1109
1110 netif_carrier_off(ndev);
1111
1112 ret = register_netdev(ndev);
1113 if (ret)
1114 goto out_free_bd;
1115
1116 pr_info("%s: fs_enet: %pM\n", ndev->name, ndev->dev_addr);
1117
1118 return 0;
1119
1120out_free_bd:
1121 fep->ops->free_bd(ndev);
1122out_cleanup_data:
1123 fep->ops->cleanup_data(ndev);
1124out_free_dev:
1125 free_netdev(ndev);
1126out_put:
1127 of_node_put(fpi->phy_node);
1128 if (fpi->clk_per)
1129 clk_disable_unprepare(fpi->clk_per);
1130out_free_fpi:
1131 kfree(fpi);
1132 return ret;
1133}
1134
1135static int fs_enet_remove(struct platform_device *ofdev)
1136{
1137 struct net_device *ndev = platform_get_drvdata(ofdev);
1138 struct fs_enet_private *fep = netdev_priv(ndev);
1139
1140 unregister_netdev(ndev);
1141
1142 fep->ops->free_bd(ndev);
1143 fep->ops->cleanup_data(ndev);
1144 dev_set_drvdata(fep->dev, NULL);
1145 of_node_put(fep->fpi->phy_node);
1146 if (fep->fpi->clk_per)
1147 clk_disable_unprepare(fep->fpi->clk_per);
1148 free_netdev(ndev);
1149 return 0;
1150}
1151
1152static struct of_device_id fs_enet_match[] = {
1153#ifdef CONFIG_FS_ENET_HAS_SCC
1154 {
1155 .compatible = "fsl,cpm1-scc-enet",
1156 .data = (void *)&fs_scc_ops,
1157 },
1158 {
1159 .compatible = "fsl,cpm2-scc-enet",
1160 .data = (void *)&fs_scc_ops,
1161 },
1162#endif
1163#ifdef CONFIG_FS_ENET_HAS_FCC
1164 {
1165 .compatible = "fsl,cpm2-fcc-enet",
1166 .data = (void *)&fs_fcc_ops,
1167 },
1168#endif
1169#ifdef CONFIG_FS_ENET_HAS_FEC
1170#ifdef CONFIG_FS_ENET_MPC5121_FEC
1171 {
1172 .compatible = "fsl,mpc5121-fec",
1173 .data = (void *)&fs_fec_ops,
1174 },
1175 {
1176 .compatible = "fsl,mpc5125-fec",
1177 .data = (void *)&fs_fec_ops,
1178 },
1179#else
1180 {
1181 .compatible = "fsl,pq1-fec-enet",
1182 .data = (void *)&fs_fec_ops,
1183 },
1184#endif
1185#endif
1186 {}
1187};
1188MODULE_DEVICE_TABLE(of, fs_enet_match);
1189
1190static struct platform_driver fs_enet_driver = {
1191 .driver = {
1192 .owner = THIS_MODULE,
1193 .name = "fs_enet",
1194 .of_match_table = fs_enet_match,
1195 },
1196 .probe = fs_enet_probe,
1197 .remove = fs_enet_remove,
1198};
1199
1200#ifdef CONFIG_NET_POLL_CONTROLLER
1201static void fs_enet_netpoll(struct net_device *dev)
1202{
1203 disable_irq(dev->irq);
1204 fs_enet_interrupt(dev->irq, dev);
1205 enable_irq(dev->irq);
1206}
1207#endif
1208
1209module_platform_driver(fs_enet_driver);