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Merge branch 'topic/jack' into for-linus
[mv-sheeva.git] / drivers / net / 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 #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");