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Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6
[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/errno.h>
23 #include <linux/init.h>
24 #include <linux/crc32.h>
25 #include <linux/hardirq.h>
26 #include <linux/delay.h>
27 #include <linux/of_device.h>
28 #include <linux/of_mdio.h>
29 #include <linux/of_platform.h>
30
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/ethtool.h>
34 #include <linux/skbuff.h>
35
36 #include <asm/io.h>
37 #include <asm/delay.h>
38 #include <asm/mpc52xx.h>
39
40 #include <sysdev/bestcomm/bestcomm.h>
41 #include <sysdev/bestcomm/fec.h>
42
43 #include "fec_mpc52xx.h"
44
45 #define DRIVER_NAME "mpc52xx-fec"
46
47 /* Private driver data structure */
48 struct mpc52xx_fec_priv {
49         struct net_device *ndev;
50         int duplex;
51         int speed;
52         int r_irq;
53         int t_irq;
54         struct mpc52xx_fec __iomem *fec;
55         struct bcom_task *rx_dmatsk;
56         struct bcom_task *tx_dmatsk;
57         spinlock_t lock;
58         int msg_enable;
59
60         /* MDIO link details */
61         unsigned int mdio_speed;
62         struct device_node *phy_node;
63         struct phy_device *phydev;
64         enum phy_state link;
65         int seven_wire_mode;
66 };
67
68
69 static irqreturn_t mpc52xx_fec_interrupt(int, void *);
70 static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *);
71 static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *);
72 static void mpc52xx_fec_stop(struct net_device *dev);
73 static void mpc52xx_fec_start(struct net_device *dev);
74 static void mpc52xx_fec_reset(struct net_device *dev);
75
76 static u8 mpc52xx_fec_mac_addr[6];
77 module_param_array_named(mac, mpc52xx_fec_mac_addr, byte, NULL, 0);
78 MODULE_PARM_DESC(mac, "six hex digits, ie. 0x1,0x2,0xc0,0x01,0xba,0xbe");
79
80 #define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \
81                 NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP)
82 static int debug = -1;  /* the above default */
83 module_param(debug, int, 0);
84 MODULE_PARM_DESC(debug, "debugging messages level");
85
86 static void mpc52xx_fec_tx_timeout(struct net_device *dev)
87 {
88         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
89         unsigned long flags;
90
91         dev_warn(&dev->dev, "transmit timed out\n");
92
93         spin_lock_irqsave(&priv->lock, flags);
94         mpc52xx_fec_reset(dev);
95         dev->stats.tx_errors++;
96         spin_unlock_irqrestore(&priv->lock, flags);
97
98         netif_wake_queue(dev);
99 }
100
101 static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac)
102 {
103         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
104         struct mpc52xx_fec __iomem *fec = priv->fec;
105
106         out_be32(&fec->paddr1, *(u32 *)(&mac[0]));
107         out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE);
108 }
109
110 static void mpc52xx_fec_get_paddr(struct net_device *dev, u8 *mac)
111 {
112         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
113         struct mpc52xx_fec __iomem *fec = priv->fec;
114
115         *(u32 *)(&mac[0]) = in_be32(&fec->paddr1);
116         *(u16 *)(&mac[4]) = in_be32(&fec->paddr2) >> 16;
117 }
118
119 static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr)
120 {
121         struct sockaddr *sock = addr;
122
123         memcpy(dev->dev_addr, sock->sa_data, dev->addr_len);
124
125         mpc52xx_fec_set_paddr(dev, sock->sa_data);
126         return 0;
127 }
128
129 static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s)
130 {
131         while (!bcom_queue_empty(s)) {
132                 struct bcom_fec_bd *bd;
133                 struct sk_buff *skb;
134
135                 skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd);
136                 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
137                                  DMA_FROM_DEVICE);
138                 kfree_skb(skb);
139         }
140 }
141
142 static void
143 mpc52xx_fec_rx_submit(struct net_device *dev, struct sk_buff *rskb)
144 {
145         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
146         struct bcom_fec_bd *bd;
147
148         bd = (struct bcom_fec_bd *) bcom_prepare_next_buffer(priv->rx_dmatsk);
149         bd->status = FEC_RX_BUFFER_SIZE;
150         bd->skb_pa = dma_map_single(dev->dev.parent, rskb->data,
151                                     FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
152         bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
153 }
154
155 static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
156 {
157         struct sk_buff *skb;
158
159         while (!bcom_queue_full(rxtsk)) {
160                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
161                 if (!skb)
162                         return -EAGAIN;
163
164                 /* zero out the initial receive buffers to aid debugging */
165                 memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
166                 mpc52xx_fec_rx_submit(dev, skb);
167         }
168         return 0;
169 }
170
171 /* based on generic_adjust_link from fs_enet-main.c */
172 static void mpc52xx_fec_adjust_link(struct net_device *dev)
173 {
174         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
175         struct phy_device *phydev = priv->phydev;
176         int new_state = 0;
177
178         if (phydev->link != PHY_DOWN) {
179                 if (phydev->duplex != priv->duplex) {
180                         struct mpc52xx_fec __iomem *fec = priv->fec;
181                         u32 rcntrl;
182                         u32 tcntrl;
183
184                         new_state = 1;
185                         priv->duplex = phydev->duplex;
186
187                         rcntrl = in_be32(&fec->r_cntrl);
188                         tcntrl = in_be32(&fec->x_cntrl);
189
190                         rcntrl &= ~FEC_RCNTRL_DRT;
191                         tcntrl &= ~FEC_TCNTRL_FDEN;
192                         if (phydev->duplex == DUPLEX_FULL)
193                                 tcntrl |= FEC_TCNTRL_FDEN;      /* FD enable */
194                         else
195                                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
196
197                         out_be32(&fec->r_cntrl, rcntrl);
198                         out_be32(&fec->x_cntrl, tcntrl);
199                 }
200
201                 if (phydev->speed != priv->speed) {
202                         new_state = 1;
203                         priv->speed = phydev->speed;
204                 }
205
206                 if (priv->link == PHY_DOWN) {
207                         new_state = 1;
208                         priv->link = phydev->link;
209                 }
210
211         } else if (priv->link) {
212                 new_state = 1;
213                 priv->link = PHY_DOWN;
214                 priv->speed = 0;
215                 priv->duplex = -1;
216         }
217
218         if (new_state && netif_msg_link(priv))
219                 phy_print_status(phydev);
220 }
221
222 static int mpc52xx_fec_open(struct net_device *dev)
223 {
224         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
225         int err = -EBUSY;
226
227         if (priv->phy_node) {
228                 priv->phydev = of_phy_connect(priv->ndev, priv->phy_node,
229                                               mpc52xx_fec_adjust_link, 0, 0);
230                 if (!priv->phydev) {
231                         dev_err(&dev->dev, "of_phy_connect failed\n");
232                         return -ENODEV;
233                 }
234                 phy_start(priv->phydev);
235         }
236
237         if (request_irq(dev->irq, mpc52xx_fec_interrupt, IRQF_SHARED,
238                         DRIVER_NAME "_ctrl", dev)) {
239                 dev_err(&dev->dev, "ctrl interrupt request failed\n");
240                 goto free_phy;
241         }
242         if (request_irq(priv->r_irq, mpc52xx_fec_rx_interrupt, 0,
243                         DRIVER_NAME "_rx", dev)) {
244                 dev_err(&dev->dev, "rx interrupt request failed\n");
245                 goto free_ctrl_irq;
246         }
247         if (request_irq(priv->t_irq, mpc52xx_fec_tx_interrupt, 0,
248                         DRIVER_NAME "_tx", dev)) {
249                 dev_err(&dev->dev, "tx interrupt request failed\n");
250                 goto free_2irqs;
251         }
252
253         bcom_fec_rx_reset(priv->rx_dmatsk);
254         bcom_fec_tx_reset(priv->tx_dmatsk);
255
256         err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
257         if (err) {
258                 dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
259                 goto free_irqs;
260         }
261
262         bcom_enable(priv->rx_dmatsk);
263         bcom_enable(priv->tx_dmatsk);
264
265         mpc52xx_fec_start(dev);
266
267         netif_start_queue(dev);
268
269         return 0;
270
271  free_irqs:
272         free_irq(priv->t_irq, dev);
273  free_2irqs:
274         free_irq(priv->r_irq, dev);
275  free_ctrl_irq:
276         free_irq(dev->irq, dev);
277  free_phy:
278         if (priv->phydev) {
279                 phy_stop(priv->phydev);
280                 phy_disconnect(priv->phydev);
281                 priv->phydev = NULL;
282         }
283
284         return err;
285 }
286
287 static int mpc52xx_fec_close(struct net_device *dev)
288 {
289         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
290
291         netif_stop_queue(dev);
292
293         mpc52xx_fec_stop(dev);
294
295         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
296
297         free_irq(dev->irq, dev);
298         free_irq(priv->r_irq, dev);
299         free_irq(priv->t_irq, dev);
300
301         if (priv->phydev) {
302                 /* power down phy */
303                 phy_stop(priv->phydev);
304                 phy_disconnect(priv->phydev);
305                 priv->phydev = NULL;
306         }
307
308         return 0;
309 }
310
311 /* This will only be invoked if your driver is _not_ in XOFF state.
312  * What this means is that you need not check it, and that this
313  * invariant will hold if you make sure that the netif_*_queue()
314  * calls are done at the proper times.
315  */
316 static int mpc52xx_fec_start_xmit(struct sk_buff *skb, struct net_device *dev)
317 {
318         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
319         struct bcom_fec_bd *bd;
320         unsigned long flags;
321
322         if (bcom_queue_full(priv->tx_dmatsk)) {
323                 if (net_ratelimit())
324                         dev_err(&dev->dev, "transmit queue overrun\n");
325                 return NETDEV_TX_BUSY;
326         }
327
328         spin_lock_irqsave(&priv->lock, flags);
329         dev->trans_start = jiffies;
330
331         bd = (struct bcom_fec_bd *)
332                 bcom_prepare_next_buffer(priv->tx_dmatsk);
333
334         bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
335         bd->skb_pa = dma_map_single(dev->dev.parent, skb->data, skb->len,
336                                     DMA_TO_DEVICE);
337
338         bcom_submit_next_buffer(priv->tx_dmatsk, skb);
339         spin_unlock_irqrestore(&priv->lock, flags);
340
341         if (bcom_queue_full(priv->tx_dmatsk)) {
342                 netif_stop_queue(dev);
343         }
344
345         return NETDEV_TX_OK;
346 }
347
348 #ifdef CONFIG_NET_POLL_CONTROLLER
349 static void mpc52xx_fec_poll_controller(struct net_device *dev)
350 {
351         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
352
353         disable_irq(priv->t_irq);
354         mpc52xx_fec_tx_interrupt(priv->t_irq, dev);
355         enable_irq(priv->t_irq);
356         disable_irq(priv->r_irq);
357         mpc52xx_fec_rx_interrupt(priv->r_irq, dev);
358         enable_irq(priv->r_irq);
359 }
360 #endif
361
362
363 /* This handles BestComm transmit task interrupts
364  */
365 static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
366 {
367         struct net_device *dev = dev_id;
368         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
369         unsigned long flags;
370
371         spin_lock_irqsave(&priv->lock, flags);
372         while (bcom_buffer_done(priv->tx_dmatsk)) {
373                 struct sk_buff *skb;
374                 struct bcom_fec_bd *bd;
375                 skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
376                                 (struct bcom_bd **)&bd);
377                 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
378                                  DMA_TO_DEVICE);
379
380                 dev_kfree_skb_irq(skb);
381         }
382         spin_unlock_irqrestore(&priv->lock, flags);
383
384         netif_wake_queue(dev);
385
386         return IRQ_HANDLED;
387 }
388
389 static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
390 {
391         struct net_device *dev = dev_id;
392         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
393         struct sk_buff *rskb; /* received sk_buff */
394         struct sk_buff *skb;  /* new sk_buff to enqueue in its place */
395         struct bcom_fec_bd *bd;
396         u32 status, physaddr;
397         int length;
398         unsigned long flags;
399
400         spin_lock_irqsave(&priv->lock, flags);
401
402         while (bcom_buffer_done(priv->rx_dmatsk)) {
403
404                 rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
405                                             (struct bcom_bd **)&bd);
406                 physaddr = bd->skb_pa;
407
408                 /* Test for errors in received frame */
409                 if (status & BCOM_FEC_RX_BD_ERRORS) {
410                         /* Drop packet and reuse the buffer */
411                         mpc52xx_fec_rx_submit(dev, rskb);
412                         dev->stats.rx_dropped++;
413                         continue;
414                 }
415
416                 /* skbs are allocated on open, so now we allocate a new one,
417                  * and remove the old (with the packet) */
418                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
419                 if (!skb) {
420                         /* Can't get a new one : reuse the same & drop pkt */
421                         dev_notice(&dev->dev, "Low memory - dropped packet.\n");
422                         mpc52xx_fec_rx_submit(dev, rskb);
423                         dev->stats.rx_dropped++;
424                         continue;
425                 }
426
427                 /* Enqueue the new sk_buff back on the hardware */
428                 mpc52xx_fec_rx_submit(dev, skb);
429
430                 /* Process the received skb - Drop the spin lock while
431                  * calling into the network stack */
432                 spin_unlock_irqrestore(&priv->lock, flags);
433
434                 dma_unmap_single(dev->dev.parent, physaddr, rskb->len,
435                                  DMA_FROM_DEVICE);
436                 length = status & BCOM_FEC_RX_BD_LEN_MASK;
437                 skb_put(rskb, length - 4);      /* length without CRC32 */
438                 rskb->dev = dev;
439                 rskb->protocol = eth_type_trans(rskb, dev);
440                 netif_rx(rskb);
441
442                 spin_lock_irqsave(&priv->lock, flags);
443         }
444
445         spin_unlock_irqrestore(&priv->lock, flags);
446
447         return IRQ_HANDLED;
448 }
449
450 static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
451 {
452         struct net_device *dev = dev_id;
453         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
454         struct mpc52xx_fec __iomem *fec = priv->fec;
455         u32 ievent;
456         unsigned long flags;
457
458         ievent = in_be32(&fec->ievent);
459
460         ievent &= ~FEC_IEVENT_MII;      /* mii is handled separately */
461         if (!ievent)
462                 return IRQ_NONE;
463
464         out_be32(&fec->ievent, ievent);         /* clear pending events */
465
466         /* on fifo error, soft-reset fec */
467         if (ievent & (FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) {
468
469                 if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR))
470                         dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n");
471                 if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
472                         dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");
473
474                 spin_lock_irqsave(&priv->lock, flags);
475                 mpc52xx_fec_reset(dev);
476                 spin_unlock_irqrestore(&priv->lock, flags);
477
478                 return IRQ_HANDLED;
479         }
480
481         if (ievent & ~FEC_IEVENT_TFINT)
482                 dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
483
484         return IRQ_HANDLED;
485 }
486
487 /*
488  * Get the current statistics.
489  * This may be called with the card open or closed.
490  */
491 static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
492 {
493         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
494         struct net_device_stats *stats = &dev->stats;
495         struct mpc52xx_fec __iomem *fec = priv->fec;
496
497         stats->rx_bytes = in_be32(&fec->rmon_r_octets);
498         stats->rx_packets = in_be32(&fec->rmon_r_packets);
499         stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
500                 in_be32(&fec->rmon_r_undersize) +
501                 in_be32(&fec->rmon_r_oversize) +
502                 in_be32(&fec->rmon_r_frag) +
503                 in_be32(&fec->rmon_r_jab);
504
505         stats->tx_bytes = in_be32(&fec->rmon_t_octets);
506         stats->tx_packets = in_be32(&fec->rmon_t_packets);
507         stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
508                 in_be32(&fec->rmon_t_undersize) +
509                 in_be32(&fec->rmon_t_oversize) +
510                 in_be32(&fec->rmon_t_frag) +
511                 in_be32(&fec->rmon_t_jab);
512
513         stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
514         stats->collisions = in_be32(&fec->rmon_t_col);
515
516         /* detailed rx_errors: */
517         stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
518                                         + in_be32(&fec->rmon_r_oversize)
519                                         + in_be32(&fec->rmon_r_frag)
520                                         + in_be32(&fec->rmon_r_jab);
521         stats->rx_over_errors = in_be32(&fec->r_macerr);
522         stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
523         stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
524         stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
525         stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);
526
527         /* detailed tx_errors: */
528         stats->tx_aborted_errors = 0;
529         stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
530         stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
531         stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
532         stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);
533
534         return stats;
535 }
536
537 /*
538  * Read MIB counters in order to reset them,
539  * then zero all the stats fields in memory
540  */
541 static void mpc52xx_fec_reset_stats(struct net_device *dev)
542 {
543         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
544         struct mpc52xx_fec __iomem *fec = priv->fec;
545
546         out_be32(&fec->mib_control, FEC_MIB_DISABLE);
547         memset_io(&fec->rmon_t_drop, 0,
548                    offsetof(struct mpc52xx_fec, reserved10) -
549                    offsetof(struct mpc52xx_fec, rmon_t_drop));
550         out_be32(&fec->mib_control, 0);
551
552         memset(&dev->stats, 0, sizeof(dev->stats));
553 }
554
555 /*
556  * Set or clear the multicast filter for this adaptor.
557  */
558 static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
559 {
560         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
561         struct mpc52xx_fec __iomem *fec = priv->fec;
562         u32 rx_control;
563
564         rx_control = in_be32(&fec->r_cntrl);
565
566         if (dev->flags & IFF_PROMISC) {
567                 rx_control |= FEC_RCNTRL_PROM;
568                 out_be32(&fec->r_cntrl, rx_control);
569         } else {
570                 rx_control &= ~FEC_RCNTRL_PROM;
571                 out_be32(&fec->r_cntrl, rx_control);
572
573                 if (dev->flags & IFF_ALLMULTI) {
574                         out_be32(&fec->gaddr1, 0xffffffff);
575                         out_be32(&fec->gaddr2, 0xffffffff);
576                 } else {
577                         u32 crc;
578                         int i;
579                         struct dev_mc_list *dmi;
580                         u32 gaddr1 = 0x00000000;
581                         u32 gaddr2 = 0x00000000;
582
583                         dmi = dev->mc_list;
584                         for (i=0; i<dev->mc_count; i++) {
585                                 crc = ether_crc_le(6, dmi->dmi_addr) >> 26;
586                                 if (crc >= 32)
587                                         gaddr1 |= 1 << (crc-32);
588                                 else
589                                         gaddr2 |= 1 << crc;
590                                 dmi = dmi->next;
591                         }
592                         out_be32(&fec->gaddr1, gaddr1);
593                         out_be32(&fec->gaddr2, gaddr2);
594                 }
595         }
596 }
597
598 /**
599  * mpc52xx_fec_hw_init
600  * @dev: network device
601  *
602  * Setup various hardware setting, only needed once on start
603  */
604 static void mpc52xx_fec_hw_init(struct net_device *dev)
605 {
606         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
607         struct mpc52xx_fec __iomem *fec = priv->fec;
608         int i;
609
610         /* Whack a reset.  We should wait for this. */
611         out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
612         for (i = 0; i < FEC_RESET_DELAY; ++i) {
613                 if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
614                         break;
615                 udelay(1);
616         }
617         if (i == FEC_RESET_DELAY)
618                 dev_err(&dev->dev, "FEC Reset timeout!\n");
619
620         /* set pause to 0x20 frames */
621         out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);
622
623         /* high service request will be deasserted when there's < 7 bytes in fifo
624          * low service request will be deasserted when there's < 4*7 bytes in fifo
625          */
626         out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
627         out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
628
629         /* alarm when <= x bytes in FIFO */
630         out_be32(&fec->rfifo_alarm, 0x0000030c);
631         out_be32(&fec->tfifo_alarm, 0x00000100);
632
633         /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
634         out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);
635
636         /* enable crc generation */
637         out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
638         out_be32(&fec->iaddr1, 0x00000000);     /* No individual filter */
639         out_be32(&fec->iaddr2, 0x00000000);     /* No individual filter */
640
641         /* set phy speed.
642          * this can't be done in phy driver, since it needs to be called
643          * before fec stuff (even on resume) */
644         out_be32(&fec->mii_speed, priv->mdio_speed);
645 }
646
647 /**
648  * mpc52xx_fec_start
649  * @dev: network device
650  *
651  * This function is called to start or restart the FEC during a link
652  * change.  This happens on fifo errors or when switching between half
653  * and full duplex.
654  */
655 static void mpc52xx_fec_start(struct net_device *dev)
656 {
657         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
658         struct mpc52xx_fec __iomem *fec = priv->fec;
659         u32 rcntrl;
660         u32 tcntrl;
661         u32 tmp;
662
663         /* clear sticky error bits */
664         tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
665         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
666         out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);
667
668         /* FIFOs will reset on mpc52xx_fec_enable */
669         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);
670
671         /* Set station address. */
672         mpc52xx_fec_set_paddr(dev, dev->dev_addr);
673
674         mpc52xx_fec_set_multicast_list(dev);
675
676         /* set max frame len, enable flow control, select mii mode */
677         rcntrl = FEC_RX_BUFFER_SIZE << 16;      /* max frame length */
678         rcntrl |= FEC_RCNTRL_FCE;
679
680         if (!priv->seven_wire_mode)
681                 rcntrl |= FEC_RCNTRL_MII_MODE;
682
683         if (priv->duplex == DUPLEX_FULL)
684                 tcntrl = FEC_TCNTRL_FDEN;       /* FD enable */
685         else {
686                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
687                 tcntrl = 0;
688         }
689         out_be32(&fec->r_cntrl, rcntrl);
690         out_be32(&fec->x_cntrl, tcntrl);
691
692         /* Clear any outstanding interrupt. */
693         out_be32(&fec->ievent, 0xffffffff);
694
695         /* Enable interrupts we wish to service. */
696         out_be32(&fec->imask, FEC_IMASK_ENABLE);
697
698         /* And last, enable the transmit and receive processing. */
699         out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
700         out_be32(&fec->r_des_active, 0x01000000);
701 }
702
703 /**
704  * mpc52xx_fec_stop
705  * @dev: network device
706  *
707  * stop all activity on fec and empty dma buffers
708  */
709 static void mpc52xx_fec_stop(struct net_device *dev)
710 {
711         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
712         struct mpc52xx_fec __iomem *fec = priv->fec;
713         unsigned long timeout;
714
715         /* disable all interrupts */
716         out_be32(&fec->imask, 0);
717
718         /* Disable the rx task. */
719         bcom_disable(priv->rx_dmatsk);
720
721         /* Wait for tx queue to drain, but only if we're in process context */
722         if (!in_interrupt()) {
723                 timeout = jiffies + msecs_to_jiffies(2000);
724                 while (time_before(jiffies, timeout) &&
725                                 !bcom_queue_empty(priv->tx_dmatsk))
726                         msleep(100);
727
728                 if (time_after_eq(jiffies, timeout))
729                         dev_err(&dev->dev, "queues didn't drain\n");
730 #if 1
731                 if (time_after_eq(jiffies, timeout)) {
732                         dev_err(&dev->dev, "  tx: index: %i, outdex: %i\n",
733                                         priv->tx_dmatsk->index,
734                                         priv->tx_dmatsk->outdex);
735                         dev_err(&dev->dev, "  rx: index: %i, outdex: %i\n",
736                                         priv->rx_dmatsk->index,
737                                         priv->rx_dmatsk->outdex);
738                 }
739 #endif
740         }
741
742         bcom_disable(priv->tx_dmatsk);
743
744         /* Stop FEC */
745         out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
746 }
747
748 /* reset fec and bestcomm tasks */
749 static void mpc52xx_fec_reset(struct net_device *dev)
750 {
751         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
752         struct mpc52xx_fec __iomem *fec = priv->fec;
753
754         mpc52xx_fec_stop(dev);
755
756         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
757         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);
758
759         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
760
761         mpc52xx_fec_hw_init(dev);
762
763         bcom_fec_rx_reset(priv->rx_dmatsk);
764         bcom_fec_tx_reset(priv->tx_dmatsk);
765
766         mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
767
768         bcom_enable(priv->rx_dmatsk);
769         bcom_enable(priv->tx_dmatsk);
770
771         mpc52xx_fec_start(dev);
772
773         netif_wake_queue(dev);
774 }
775
776
777 /* ethtool interface */
778 static void mpc52xx_fec_get_drvinfo(struct net_device *dev,
779                 struct ethtool_drvinfo *info)
780 {
781         strcpy(info->driver, DRIVER_NAME);
782 }
783
784 static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
785 {
786         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
787
788         if (!priv->phydev)
789                 return -ENODEV;
790
791         return phy_ethtool_gset(priv->phydev, cmd);
792 }
793
794 static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
795 {
796         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
797
798         if (!priv->phydev)
799                 return -ENODEV;
800
801         return phy_ethtool_sset(priv->phydev, cmd);
802 }
803
804 static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
805 {
806         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
807         return priv->msg_enable;
808 }
809
810 static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
811 {
812         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
813         priv->msg_enable = level;
814 }
815
816 static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
817         .get_drvinfo = mpc52xx_fec_get_drvinfo,
818         .get_settings = mpc52xx_fec_get_settings,
819         .set_settings = mpc52xx_fec_set_settings,
820         .get_link = ethtool_op_get_link,
821         .get_msglevel = mpc52xx_fec_get_msglevel,
822         .set_msglevel = mpc52xx_fec_set_msglevel,
823 };
824
825
826 static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
827 {
828         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
829
830         if (!priv->phydev)
831                 return -ENOTSUPP;
832
833         return phy_mii_ioctl(priv->phydev, if_mii(rq), cmd);
834 }
835
836 static const struct net_device_ops mpc52xx_fec_netdev_ops = {
837         .ndo_open = mpc52xx_fec_open,
838         .ndo_stop = mpc52xx_fec_close,
839         .ndo_start_xmit = mpc52xx_fec_start_xmit,
840         .ndo_set_multicast_list = mpc52xx_fec_set_multicast_list,
841         .ndo_set_mac_address = mpc52xx_fec_set_mac_address,
842         .ndo_validate_addr = eth_validate_addr,
843         .ndo_do_ioctl = mpc52xx_fec_ioctl,
844         .ndo_change_mtu = eth_change_mtu,
845         .ndo_tx_timeout = mpc52xx_fec_tx_timeout,
846         .ndo_get_stats = mpc52xx_fec_get_stats,
847 #ifdef CONFIG_NET_POLL_CONTROLLER
848         .ndo_poll_controller = mpc52xx_fec_poll_controller,
849 #endif
850 };
851
852 /* ======================================================================== */
853 /* OF Driver                                                                */
854 /* ======================================================================== */
855
856 static int __devinit
857 mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
858 {
859         int rv;
860         struct net_device *ndev;
861         struct mpc52xx_fec_priv *priv = NULL;
862         struct resource mem;
863         const u32 *prop;
864         int prop_size;
865
866         phys_addr_t rx_fifo;
867         phys_addr_t tx_fifo;
868
869         /* Get the ether ndev & it's private zone */
870         ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
871         if (!ndev)
872                 return -ENOMEM;
873
874         priv = netdev_priv(ndev);
875         priv->ndev = ndev;
876
877         /* Reserve FEC control zone */
878         rv = of_address_to_resource(op->node, 0, &mem);
879         if (rv) {
880                 printk(KERN_ERR DRIVER_NAME ": "
881                                 "Error while parsing device node resource\n" );
882                 return rv;
883         }
884         if ((mem.end - mem.start + 1) < sizeof(struct mpc52xx_fec)) {
885                 printk(KERN_ERR DRIVER_NAME
886                         " - invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
887                         (unsigned long)(mem.end - mem.start + 1), sizeof(struct mpc52xx_fec));
888                 return -EINVAL;
889         }
890
891         if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec), DRIVER_NAME))
892                 return -EBUSY;
893
894         /* Init ether ndev with what we have */
895         ndev->netdev_ops        = &mpc52xx_fec_netdev_ops;
896         ndev->ethtool_ops       = &mpc52xx_fec_ethtool_ops;
897         ndev->watchdog_timeo    = FEC_WATCHDOG_TIMEOUT;
898         ndev->base_addr         = mem.start;
899         SET_NETDEV_DEV(ndev, &op->dev);
900
901         spin_lock_init(&priv->lock);
902
903         /* ioremap the zones */
904         priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));
905
906         if (!priv->fec) {
907                 rv = -ENOMEM;
908                 goto probe_error;
909         }
910
911         /* Bestcomm init */
912         rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
913         tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);
914
915         priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
916         priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);
917
918         if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
919                 printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
920                 rv = -ENOMEM;
921                 goto probe_error;
922         }
923
924         /* Get the IRQ we need one by one */
925                 /* Control */
926         ndev->irq = irq_of_parse_and_map(op->node, 0);
927
928                 /* RX */
929         priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);
930
931                 /* TX */
932         priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);
933
934         /* MAC address init */
935         if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
936                 memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
937         else
938                 mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);
939
940         priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
941
942         /*
943          * Link mode configuration
944          */
945
946         /* Start with safe defaults for link connection */
947         priv->speed = 100;
948         priv->duplex = DUPLEX_HALF;
949         priv->mdio_speed = ((mpc5xxx_get_bus_frequency(op->node) >> 20) / 5) << 1;
950
951         /* The current speed preconfigures the speed of the MII link */
952         prop = of_get_property(op->node, "current-speed", &prop_size);
953         if (prop && (prop_size >= sizeof(u32) * 2)) {
954                 priv->speed = prop[0];
955                 priv->duplex = prop[1] ? DUPLEX_FULL : DUPLEX_HALF;
956         }
957
958         /* If there is a phy handle, then get the PHY node */
959         priv->phy_node = of_parse_phandle(op->node, "phy-handle", 0);
960
961         /* the 7-wire property means don't use MII mode */
962         if (of_find_property(op->node, "fsl,7-wire-mode", NULL)) {
963                 priv->seven_wire_mode = 1;
964                 dev_info(&ndev->dev, "using 7-wire PHY mode\n");
965         }
966
967         /* Hardware init */
968         mpc52xx_fec_hw_init(ndev);
969         mpc52xx_fec_reset_stats(ndev);
970
971         rv = register_netdev(ndev);
972         if (rv < 0)
973                 goto probe_error;
974
975         /* We're done ! */
976         dev_set_drvdata(&op->dev, ndev);
977
978         return 0;
979
980
981         /* Error handling - free everything that might be allocated */
982 probe_error:
983
984         if (priv->phy_node)
985                 of_node_put(priv->phy_node);
986         priv->phy_node = NULL;
987
988         irq_dispose_mapping(ndev->irq);
989
990         if (priv->rx_dmatsk)
991                 bcom_fec_rx_release(priv->rx_dmatsk);
992         if (priv->tx_dmatsk)
993                 bcom_fec_tx_release(priv->tx_dmatsk);
994
995         if (priv->fec)
996                 iounmap(priv->fec);
997
998         release_mem_region(mem.start, sizeof(struct mpc52xx_fec));
999
1000         free_netdev(ndev);
1001
1002         return rv;
1003 }
1004
1005 static int
1006 mpc52xx_fec_remove(struct of_device *op)
1007 {
1008         struct net_device *ndev;
1009         struct mpc52xx_fec_priv *priv;
1010
1011         ndev = dev_get_drvdata(&op->dev);
1012         priv = netdev_priv(ndev);
1013
1014         unregister_netdev(ndev);
1015
1016         if (priv->phy_node)
1017                 of_node_put(priv->phy_node);
1018         priv->phy_node = NULL;
1019
1020         irq_dispose_mapping(ndev->irq);
1021
1022         bcom_fec_rx_release(priv->rx_dmatsk);
1023         bcom_fec_tx_release(priv->tx_dmatsk);
1024
1025         iounmap(priv->fec);
1026
1027         release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));
1028
1029         free_netdev(ndev);
1030
1031         dev_set_drvdata(&op->dev, NULL);
1032         return 0;
1033 }
1034
1035 #ifdef CONFIG_PM
1036 static int mpc52xx_fec_of_suspend(struct of_device *op, pm_message_t state)
1037 {
1038         struct net_device *dev = dev_get_drvdata(&op->dev);
1039
1040         if (netif_running(dev))
1041                 mpc52xx_fec_close(dev);
1042
1043         return 0;
1044 }
1045
1046 static int mpc52xx_fec_of_resume(struct of_device *op)
1047 {
1048         struct net_device *dev = dev_get_drvdata(&op->dev);
1049
1050         mpc52xx_fec_hw_init(dev);
1051         mpc52xx_fec_reset_stats(dev);
1052
1053         if (netif_running(dev))
1054                 mpc52xx_fec_open(dev);
1055
1056         return 0;
1057 }
1058 #endif
1059
1060 static struct of_device_id mpc52xx_fec_match[] = {
1061         { .compatible = "fsl,mpc5200b-fec", },
1062         { .compatible = "fsl,mpc5200-fec", },
1063         { .compatible = "mpc5200-fec", },
1064         { }
1065 };
1066
1067 MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);
1068
1069 static struct of_platform_driver mpc52xx_fec_driver = {
1070         .owner          = THIS_MODULE,
1071         .name           = DRIVER_NAME,
1072         .match_table    = mpc52xx_fec_match,
1073         .probe          = mpc52xx_fec_probe,
1074         .remove         = mpc52xx_fec_remove,
1075 #ifdef CONFIG_PM
1076         .suspend        = mpc52xx_fec_of_suspend,
1077         .resume         = mpc52xx_fec_of_resume,
1078 #endif
1079 };
1080
1081
1082 /* ======================================================================== */
1083 /* Module                                                                   */
1084 /* ======================================================================== */
1085
1086 static int __init
1087 mpc52xx_fec_init(void)
1088 {
1089 #ifdef CONFIG_FEC_MPC52xx_MDIO
1090         int ret;
1091         ret = of_register_platform_driver(&mpc52xx_fec_mdio_driver);
1092         if (ret) {
1093                 printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
1094                 return ret;
1095         }
1096 #endif
1097         return of_register_platform_driver(&mpc52xx_fec_driver);
1098 }
1099
1100 static void __exit
1101 mpc52xx_fec_exit(void)
1102 {
1103         of_unregister_platform_driver(&mpc52xx_fec_driver);
1104 #ifdef CONFIG_FEC_MPC52xx_MDIO
1105         of_unregister_platform_driver(&mpc52xx_fec_mdio_driver);
1106 #endif
1107 }
1108
1109
1110 module_init(mpc52xx_fec_init);
1111 module_exit(mpc52xx_fec_exit);
1112
1113 MODULE_LICENSE("GPL");
1114 MODULE_AUTHOR("Dale Farnsworth");
1115 MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");