Fix region size check in mpc5200 FEC driver
[linux-2.6.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_platform.h>
29
30 #include <linux/netdevice.h>
31 #include <linux/etherdevice.h>
32 #include <linux/ethtool.h>
33 #include <linux/skbuff.h>
34
35 #include <asm/io.h>
36 #include <asm/delay.h>
37 #include <asm/mpc52xx.h>
38
39 #include <sysdev/bestcomm/bestcomm.h>
40 #include <sysdev/bestcomm/fec.h>
41
42 #include "fec_mpc52xx.h"
43
44 #define DRIVER_NAME "mpc52xx-fec"
45
46 static irqreturn_t mpc52xx_fec_interrupt(int, void *);
47 static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *);
48 static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *);
49 static void mpc52xx_fec_stop(struct net_device *dev);
50 static void mpc52xx_fec_start(struct net_device *dev);
51 static void mpc52xx_fec_reset(struct net_device *dev);
52
53 static u8 mpc52xx_fec_mac_addr[6];
54 module_param_array_named(mac, mpc52xx_fec_mac_addr, byte, NULL, 0);
55 MODULE_PARM_DESC(mac, "six hex digits, ie. 0x1,0x2,0xc0,0x01,0xba,0xbe");
56
57 #define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \
58                 NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFDOWN )
59 static int debug = -1;  /* the above default */
60 module_param(debug, int, 0);
61 MODULE_PARM_DESC(debug, "debugging messages level");
62
63 static void mpc52xx_fec_tx_timeout(struct net_device *dev)
64 {
65         dev_warn(&dev->dev, "transmit timed out\n");
66
67         mpc52xx_fec_reset(dev);
68
69         dev->stats.tx_errors++;
70
71         netif_wake_queue(dev);
72 }
73
74 static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac)
75 {
76         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
77         struct mpc52xx_fec __iomem *fec = priv->fec;
78
79         out_be32(&fec->paddr1, *(u32 *)(&mac[0]));
80         out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE);
81 }
82
83 static void mpc52xx_fec_get_paddr(struct net_device *dev, u8 *mac)
84 {
85         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
86         struct mpc52xx_fec __iomem *fec = priv->fec;
87
88         *(u32 *)(&mac[0]) = in_be32(&fec->paddr1);
89         *(u16 *)(&mac[4]) = in_be32(&fec->paddr2) >> 16;
90 }
91
92 static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr)
93 {
94         struct sockaddr *sock = addr;
95
96         memcpy(dev->dev_addr, sock->sa_data, dev->addr_len);
97
98         mpc52xx_fec_set_paddr(dev, sock->sa_data);
99         return 0;
100 }
101
102 static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s)
103 {
104         while (!bcom_queue_empty(s)) {
105                 struct bcom_fec_bd *bd;
106                 struct sk_buff *skb;
107
108                 skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd);
109                 dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_FROM_DEVICE);
110                 kfree_skb(skb);
111         }
112 }
113
114 static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
115 {
116         while (!bcom_queue_full(rxtsk)) {
117                 struct sk_buff *skb;
118                 struct bcom_fec_bd *bd;
119
120                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
121                 if (skb == NULL)
122                         return -EAGAIN;
123
124                 /* zero out the initial receive buffers to aid debugging */
125                 memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
126
127                 bd = (struct bcom_fec_bd *)bcom_prepare_next_buffer(rxtsk);
128
129                 bd->status = FEC_RX_BUFFER_SIZE;
130                 bd->skb_pa = dma_map_single(&dev->dev, skb->data,
131                                 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
132
133                 bcom_submit_next_buffer(rxtsk, skb);
134         }
135
136         return 0;
137 }
138
139 /* based on generic_adjust_link from fs_enet-main.c */
140 static void mpc52xx_fec_adjust_link(struct net_device *dev)
141 {
142         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
143         struct phy_device *phydev = priv->phydev;
144         int new_state = 0;
145
146         if (phydev->link != PHY_DOWN) {
147                 if (phydev->duplex != priv->duplex) {
148                         struct mpc52xx_fec __iomem *fec = priv->fec;
149                         u32 rcntrl;
150                         u32 tcntrl;
151
152                         new_state = 1;
153                         priv->duplex = phydev->duplex;
154
155                         rcntrl = in_be32(&fec->r_cntrl);
156                         tcntrl = in_be32(&fec->x_cntrl);
157
158                         rcntrl &= ~FEC_RCNTRL_DRT;
159                         tcntrl &= ~FEC_TCNTRL_FDEN;
160                         if (phydev->duplex == DUPLEX_FULL)
161                                 tcntrl |= FEC_TCNTRL_FDEN;      /* FD enable */
162                         else
163                                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
164
165                         out_be32(&fec->r_cntrl, rcntrl);
166                         out_be32(&fec->x_cntrl, tcntrl);
167                 }
168
169                 if (phydev->speed != priv->speed) {
170                         new_state = 1;
171                         priv->speed = phydev->speed;
172                 }
173
174                 if (priv->link == PHY_DOWN) {
175                         new_state = 1;
176                         priv->link = phydev->link;
177                         netif_schedule(dev);
178                         netif_carrier_on(dev);
179                         netif_start_queue(dev);
180                 }
181
182         } else if (priv->link) {
183                 new_state = 1;
184                 priv->link = PHY_DOWN;
185                 priv->speed = 0;
186                 priv->duplex = -1;
187                 netif_stop_queue(dev);
188                 netif_carrier_off(dev);
189         }
190
191         if (new_state && netif_msg_link(priv))
192                 phy_print_status(phydev);
193 }
194
195 static int mpc52xx_fec_init_phy(struct net_device *dev)
196 {
197         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
198         struct phy_device *phydev;
199         char phy_id[BUS_ID_SIZE];
200
201         snprintf(phy_id, BUS_ID_SIZE, PHY_ID_FMT,
202                         (unsigned int)dev->base_addr, priv->phy_addr);
203
204         priv->link = PHY_DOWN;
205         priv->speed = 0;
206         priv->duplex = -1;
207
208         phydev = phy_connect(dev, phy_id, &mpc52xx_fec_adjust_link, 0, PHY_INTERFACE_MODE_MII);
209         if (IS_ERR(phydev)) {
210                 dev_err(&dev->dev, "phy_connect failed\n");
211                 return PTR_ERR(phydev);
212         }
213         dev_info(&dev->dev, "attached phy %i to driver %s\n",
214                         phydev->addr, phydev->drv->name);
215
216         priv->phydev = phydev;
217
218         return 0;
219 }
220
221 static int mpc52xx_fec_phy_start(struct net_device *dev)
222 {
223         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
224         int err;
225
226         if (!priv->has_phy)
227                 return 0;
228
229         err = mpc52xx_fec_init_phy(dev);
230         if (err) {
231                 dev_err(&dev->dev, "mpc52xx_fec_init_phy failed\n");
232                 return err;
233         }
234
235         /* reset phy - this also wakes it from PDOWN */
236         phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
237         phy_start(priv->phydev);
238
239         return 0;
240 }
241
242 static void mpc52xx_fec_phy_stop(struct net_device *dev)
243 {
244         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
245
246         if (!priv->has_phy)
247                 return;
248
249         phy_disconnect(priv->phydev);
250         /* power down phy */
251         phy_stop(priv->phydev);
252         phy_write(priv->phydev, MII_BMCR, BMCR_PDOWN);
253 }
254
255 static int mpc52xx_fec_phy_mii_ioctl(struct mpc52xx_fec_priv *priv,
256                 struct mii_ioctl_data *mii_data, int cmd)
257 {
258         if (!priv->has_phy)
259                 return -ENOTSUPP;
260
261         return phy_mii_ioctl(priv->phydev, mii_data, cmd);
262 }
263
264 static void mpc52xx_fec_phy_hw_init(struct mpc52xx_fec_priv *priv)
265 {
266         struct mpc52xx_fec __iomem *fec = priv->fec;
267
268         if (!priv->has_phy)
269                 return;
270
271         out_be32(&fec->mii_speed, priv->phy_speed);
272 }
273
274 static int mpc52xx_fec_open(struct net_device *dev)
275 {
276         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
277         int err = -EBUSY;
278
279         if (request_irq(dev->irq, &mpc52xx_fec_interrupt, IRQF_SHARED,
280                         DRIVER_NAME "_ctrl", dev)) {
281                 dev_err(&dev->dev, "ctrl interrupt request failed\n");
282                 goto out;
283         }
284         if (request_irq(priv->r_irq, &mpc52xx_fec_rx_interrupt, 0,
285                         DRIVER_NAME "_rx", dev)) {
286                 dev_err(&dev->dev, "rx interrupt request failed\n");
287                 goto free_ctrl_irq;
288         }
289         if (request_irq(priv->t_irq, &mpc52xx_fec_tx_interrupt, 0,
290                         DRIVER_NAME "_tx", dev)) {
291                 dev_err(&dev->dev, "tx interrupt request failed\n");
292                 goto free_2irqs;
293         }
294
295         bcom_fec_rx_reset(priv->rx_dmatsk);
296         bcom_fec_tx_reset(priv->tx_dmatsk);
297
298         err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
299         if (err) {
300                 dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
301                 goto free_irqs;
302         }
303
304         err = mpc52xx_fec_phy_start(dev);
305         if (err)
306                 goto free_skbs;
307
308         bcom_enable(priv->rx_dmatsk);
309         bcom_enable(priv->tx_dmatsk);
310
311         mpc52xx_fec_start(dev);
312
313         netif_start_queue(dev);
314
315         return 0;
316
317  free_skbs:
318         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
319
320  free_irqs:
321         free_irq(priv->t_irq, dev);
322  free_2irqs:
323         free_irq(priv->r_irq, dev);
324  free_ctrl_irq:
325         free_irq(dev->irq, dev);
326  out:
327
328         return err;
329 }
330
331 static int mpc52xx_fec_close(struct net_device *dev)
332 {
333         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
334
335         netif_stop_queue(dev);
336
337         mpc52xx_fec_stop(dev);
338
339         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
340
341         free_irq(dev->irq, dev);
342         free_irq(priv->r_irq, dev);
343         free_irq(priv->t_irq, dev);
344
345         mpc52xx_fec_phy_stop(dev);
346
347         return 0;
348 }
349
350 /* This will only be invoked if your driver is _not_ in XOFF state.
351  * What this means is that you need not check it, and that this
352  * invariant will hold if you make sure that the netif_*_queue()
353  * calls are done at the proper times.
354  */
355 static int mpc52xx_fec_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
356 {
357         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
358         struct bcom_fec_bd *bd;
359
360         if (bcom_queue_full(priv->tx_dmatsk)) {
361                 if (net_ratelimit())
362                         dev_err(&dev->dev, "transmit queue overrun\n");
363                 return 1;
364         }
365
366         spin_lock_irq(&priv->lock);
367         dev->trans_start = jiffies;
368
369         bd = (struct bcom_fec_bd *)
370                 bcom_prepare_next_buffer(priv->tx_dmatsk);
371
372         bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
373         bd->skb_pa = dma_map_single(&dev->dev, skb->data, skb->len, DMA_TO_DEVICE);
374
375         bcom_submit_next_buffer(priv->tx_dmatsk, skb);
376
377         if (bcom_queue_full(priv->tx_dmatsk)) {
378                 netif_stop_queue(dev);
379         }
380
381         spin_unlock_irq(&priv->lock);
382
383         return 0;
384 }
385
386 /* This handles BestComm transmit task interrupts
387  */
388 static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
389 {
390         struct net_device *dev = dev_id;
391         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
392
393         spin_lock(&priv->lock);
394
395         while (bcom_buffer_done(priv->tx_dmatsk)) {
396                 struct sk_buff *skb;
397                 struct bcom_fec_bd *bd;
398                 skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
399                                 (struct bcom_bd **)&bd);
400                 dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_TO_DEVICE);
401
402                 dev_kfree_skb_irq(skb);
403         }
404
405         netif_wake_queue(dev);
406
407         spin_unlock(&priv->lock);
408
409         return IRQ_HANDLED;
410 }
411
412 static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
413 {
414         struct net_device *dev = dev_id;
415         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
416
417         while (bcom_buffer_done(priv->rx_dmatsk)) {
418                 struct sk_buff *skb;
419                 struct sk_buff *rskb;
420                 struct bcom_fec_bd *bd;
421                 u32 status;
422
423                 rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
424                                 (struct bcom_bd **)&bd);
425                 dma_unmap_single(&dev->dev, bd->skb_pa, skb->len, DMA_FROM_DEVICE);
426
427                 /* Test for errors in received frame */
428                 if (status & BCOM_FEC_RX_BD_ERRORS) {
429                         /* Drop packet and reuse the buffer */
430                         bd = (struct bcom_fec_bd *)
431                                 bcom_prepare_next_buffer(priv->rx_dmatsk);
432
433                         bd->status = FEC_RX_BUFFER_SIZE;
434                         bd->skb_pa = dma_map_single(&dev->dev, rskb->data,
435                                         FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
436
437                         bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
438
439                         dev->stats.rx_dropped++;
440
441                         continue;
442                 }
443
444                 /* skbs are allocated on open, so now we allocate a new one,
445                  * and remove the old (with the packet) */
446                 skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
447                 if (skb) {
448                         /* Process the received skb */
449                         int length = status & BCOM_FEC_RX_BD_LEN_MASK;
450
451                         skb_put(rskb, length - 4);      /* length without CRC32 */
452
453                         rskb->dev = dev;
454                         rskb->protocol = eth_type_trans(rskb, dev);
455
456                         netif_rx(rskb);
457                         dev->last_rx = jiffies;
458                 } else {
459                         /* Can't get a new one : reuse the same & drop pkt */
460                         dev_notice(&dev->dev, "Memory squeeze, dropping packet.\n");
461                         dev->stats.rx_dropped++;
462
463                         skb = rskb;
464                 }
465
466                 bd = (struct bcom_fec_bd *)
467                         bcom_prepare_next_buffer(priv->rx_dmatsk);
468
469                 bd->status = FEC_RX_BUFFER_SIZE;
470                 bd->skb_pa = dma_map_single(&dev->dev, rskb->data,
471                                 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
472
473                 bcom_submit_next_buffer(priv->rx_dmatsk, skb);
474         }
475
476         return IRQ_HANDLED;
477 }
478
479 static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
480 {
481         struct net_device *dev = dev_id;
482         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
483         struct mpc52xx_fec __iomem *fec = priv->fec;
484         u32 ievent;
485
486         ievent = in_be32(&fec->ievent);
487
488         ievent &= ~FEC_IEVENT_MII;      /* mii is handled separately */
489         if (!ievent)
490                 return IRQ_NONE;
491
492         out_be32(&fec->ievent, ievent);         /* clear pending events */
493
494         if (ievent & ~(FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) {
495                 if (ievent & ~FEC_IEVENT_TFINT)
496                         dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
497                 return IRQ_HANDLED;
498         }
499
500         if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR))
501                 dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n");
502         if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
503                 dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");
504
505         mpc52xx_fec_reset(dev);
506
507         netif_wake_queue(dev);
508         return IRQ_HANDLED;
509 }
510
511 /*
512  * Get the current statistics.
513  * This may be called with the card open or closed.
514  */
515 static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
516 {
517         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
518         struct net_device_stats *stats = &dev->stats;
519         struct mpc52xx_fec __iomem *fec = priv->fec;
520
521         stats->rx_bytes = in_be32(&fec->rmon_r_octets);
522         stats->rx_packets = in_be32(&fec->rmon_r_packets);
523         stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
524                 in_be32(&fec->rmon_r_undersize) +
525                 in_be32(&fec->rmon_r_oversize) +
526                 in_be32(&fec->rmon_r_frag) +
527                 in_be32(&fec->rmon_r_jab);
528
529         stats->tx_bytes = in_be32(&fec->rmon_t_octets);
530         stats->tx_packets = in_be32(&fec->rmon_t_packets);
531         stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
532                 in_be32(&fec->rmon_t_undersize) +
533                 in_be32(&fec->rmon_t_oversize) +
534                 in_be32(&fec->rmon_t_frag) +
535                 in_be32(&fec->rmon_t_jab);
536
537         stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
538         stats->collisions = in_be32(&fec->rmon_t_col);
539
540         /* detailed rx_errors: */
541         stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
542                                         + in_be32(&fec->rmon_r_oversize)
543                                         + in_be32(&fec->rmon_r_frag)
544                                         + in_be32(&fec->rmon_r_jab);
545         stats->rx_over_errors = in_be32(&fec->r_macerr);
546         stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
547         stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
548         stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
549         stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);
550
551         /* detailed tx_errors: */
552         stats->tx_aborted_errors = 0;
553         stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
554         stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
555         stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
556         stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);
557
558         return stats;
559 }
560
561 /*
562  * Read MIB counters in order to reset them,
563  * then zero all the stats fields in memory
564  */
565 static void mpc52xx_fec_reset_stats(struct net_device *dev)
566 {
567         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
568         struct mpc52xx_fec __iomem *fec = priv->fec;
569
570         out_be32(&fec->mib_control, FEC_MIB_DISABLE);
571         memset_io(&fec->rmon_t_drop, 0, (__force u32)&fec->reserved10 -
572                         (__force u32)&fec->rmon_t_drop);
573         out_be32(&fec->mib_control, 0);
574
575         memset(&dev->stats, 0, sizeof(dev->stats));
576 }
577
578 /*
579  * Set or clear the multicast filter for this adaptor.
580  */
581 static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
582 {
583         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
584         struct mpc52xx_fec __iomem *fec = priv->fec;
585         u32 rx_control;
586
587         rx_control = in_be32(&fec->r_cntrl);
588
589         if (dev->flags & IFF_PROMISC) {
590                 rx_control |= FEC_RCNTRL_PROM;
591                 out_be32(&fec->r_cntrl, rx_control);
592         } else {
593                 rx_control &= ~FEC_RCNTRL_PROM;
594                 out_be32(&fec->r_cntrl, rx_control);
595
596                 if (dev->flags & IFF_ALLMULTI) {
597                         out_be32(&fec->gaddr1, 0xffffffff);
598                         out_be32(&fec->gaddr2, 0xffffffff);
599                 } else {
600                         u32 crc;
601                         int i;
602                         struct dev_mc_list *dmi;
603                         u32 gaddr1 = 0x00000000;
604                         u32 gaddr2 = 0x00000000;
605
606                         dmi = dev->mc_list;
607                         for (i=0; i<dev->mc_count; i++) {
608                                 crc = ether_crc_le(6, dmi->dmi_addr) >> 26;
609                                 if (crc >= 32)
610                                         gaddr1 |= 1 << (crc-32);
611                                 else
612                                         gaddr2 |= 1 << crc;
613                                 dmi = dmi->next;
614                         }
615                         out_be32(&fec->gaddr1, gaddr1);
616                         out_be32(&fec->gaddr2, gaddr2);
617                 }
618         }
619 }
620
621 /**
622  * mpc52xx_fec_hw_init
623  * @dev: network device
624  *
625  * Setup various hardware setting, only needed once on start
626  */
627 static void mpc52xx_fec_hw_init(struct net_device *dev)
628 {
629         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
630         struct mpc52xx_fec __iomem *fec = priv->fec;
631         int i;
632
633         /* Whack a reset.  We should wait for this. */
634         out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
635         for (i = 0; i < FEC_RESET_DELAY; ++i) {
636                 if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
637                         break;
638                 udelay(1);
639         }
640         if (i == FEC_RESET_DELAY)
641                 dev_err(&dev->dev, "FEC Reset timeout!\n");
642
643         /* set pause to 0x20 frames */
644         out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);
645
646         /* high service request will be deasserted when there's < 7 bytes in fifo
647          * low service request will be deasserted when there's < 4*7 bytes in fifo
648          */
649         out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
650         out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
651
652         /* alarm when <= x bytes in FIFO */
653         out_be32(&fec->rfifo_alarm, 0x0000030c);
654         out_be32(&fec->tfifo_alarm, 0x00000100);
655
656         /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
657         out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);
658
659         /* enable crc generation */
660         out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
661         out_be32(&fec->iaddr1, 0x00000000);     /* No individual filter */
662         out_be32(&fec->iaddr2, 0x00000000);     /* No individual filter */
663
664         /* set phy speed.
665          * this can't be done in phy driver, since it needs to be called
666          * before fec stuff (even on resume) */
667         mpc52xx_fec_phy_hw_init(priv);
668 }
669
670 /**
671  * mpc52xx_fec_start
672  * @dev: network device
673  *
674  * This function is called to start or restart the FEC during a link
675  * change.  This happens on fifo errors or when switching between half
676  * and full duplex.
677  */
678 static void mpc52xx_fec_start(struct net_device *dev)
679 {
680         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
681         struct mpc52xx_fec __iomem *fec = priv->fec;
682         u32 rcntrl;
683         u32 tcntrl;
684         u32 tmp;
685
686         /* clear sticky error bits */
687         tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
688         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
689         out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);
690
691         /* FIFOs will reset on mpc52xx_fec_enable */
692         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);
693
694         /* Set station address. */
695         mpc52xx_fec_set_paddr(dev, dev->dev_addr);
696
697         mpc52xx_fec_set_multicast_list(dev);
698
699         /* set max frame len, enable flow control, select mii mode */
700         rcntrl = FEC_RX_BUFFER_SIZE << 16;      /* max frame length */
701         rcntrl |= FEC_RCNTRL_FCE;
702
703         if (priv->has_phy)
704                 rcntrl |= FEC_RCNTRL_MII_MODE;
705
706         if (priv->duplex == DUPLEX_FULL)
707                 tcntrl = FEC_TCNTRL_FDEN;       /* FD enable */
708         else {
709                 rcntrl |= FEC_RCNTRL_DRT;       /* disable Rx on Tx (HD) */
710                 tcntrl = 0;
711         }
712         out_be32(&fec->r_cntrl, rcntrl);
713         out_be32(&fec->x_cntrl, tcntrl);
714
715         /* Clear any outstanding interrupt. */
716         out_be32(&fec->ievent, 0xffffffff);
717
718         /* Enable interrupts we wish to service. */
719         out_be32(&fec->imask, FEC_IMASK_ENABLE);
720
721         /* And last, enable the transmit and receive processing. */
722         out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
723         out_be32(&fec->r_des_active, 0x01000000);
724 }
725
726 /**
727  * mpc52xx_fec_stop
728  * @dev: network device
729  *
730  * stop all activity on fec and empty dma buffers
731  */
732 static void mpc52xx_fec_stop(struct net_device *dev)
733 {
734         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
735         struct mpc52xx_fec __iomem *fec = priv->fec;
736         unsigned long timeout;
737
738         /* disable all interrupts */
739         out_be32(&fec->imask, 0);
740
741         /* Disable the rx task. */
742         bcom_disable(priv->rx_dmatsk);
743
744         /* Wait for tx queue to drain, but only if we're in process context */
745         if (!in_interrupt()) {
746                 timeout = jiffies + msecs_to_jiffies(2000);
747                 while (time_before(jiffies, timeout) &&
748                                 !bcom_queue_empty(priv->tx_dmatsk))
749                         msleep(100);
750
751                 if (time_after_eq(jiffies, timeout))
752                         dev_err(&dev->dev, "queues didn't drain\n");
753 #if 1
754                 if (time_after_eq(jiffies, timeout)) {
755                         dev_err(&dev->dev, "  tx: index: %i, outdex: %i\n",
756                                         priv->tx_dmatsk->index,
757                                         priv->tx_dmatsk->outdex);
758                         dev_err(&dev->dev, "  rx: index: %i, outdex: %i\n",
759                                         priv->rx_dmatsk->index,
760                                         priv->rx_dmatsk->outdex);
761                 }
762 #endif
763         }
764
765         bcom_disable(priv->tx_dmatsk);
766
767         /* Stop FEC */
768         out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
769
770         return;
771 }
772
773 /* reset fec and bestcomm tasks */
774 static void mpc52xx_fec_reset(struct net_device *dev)
775 {
776         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
777         struct mpc52xx_fec __iomem *fec = priv->fec;
778
779         mpc52xx_fec_stop(dev);
780
781         out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
782         out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);
783
784         mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
785
786         mpc52xx_fec_hw_init(dev);
787
788         phy_stop(priv->phydev);
789         phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
790         phy_start(priv->phydev);
791
792         bcom_fec_rx_reset(priv->rx_dmatsk);
793         bcom_fec_tx_reset(priv->tx_dmatsk);
794
795         mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
796
797         bcom_enable(priv->rx_dmatsk);
798         bcom_enable(priv->tx_dmatsk);
799
800         mpc52xx_fec_start(dev);
801 }
802
803
804 /* ethtool interface */
805 static void mpc52xx_fec_get_drvinfo(struct net_device *dev,
806                 struct ethtool_drvinfo *info)
807 {
808         strcpy(info->driver, DRIVER_NAME);
809 }
810
811 static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
812 {
813         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
814         return phy_ethtool_gset(priv->phydev, cmd);
815 }
816
817 static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
818 {
819         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
820         return phy_ethtool_sset(priv->phydev, cmd);
821 }
822
823 static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
824 {
825         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
826         return priv->msg_enable;
827 }
828
829 static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
830 {
831         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
832         priv->msg_enable = level;
833 }
834
835 static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
836         .get_drvinfo = mpc52xx_fec_get_drvinfo,
837         .get_settings = mpc52xx_fec_get_settings,
838         .set_settings = mpc52xx_fec_set_settings,
839         .get_link = ethtool_op_get_link,
840         .get_msglevel = mpc52xx_fec_get_msglevel,
841         .set_msglevel = mpc52xx_fec_set_msglevel,
842 };
843
844
845 static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
846 {
847         struct mpc52xx_fec_priv *priv = netdev_priv(dev);
848
849         return mpc52xx_fec_phy_mii_ioctl(priv, if_mii(rq), cmd);
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 phandle *ph;
864
865         phys_addr_t rx_fifo;
866         phys_addr_t tx_fifo;
867
868         /* Get the ether ndev & it's private zone */
869         ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
870         if (!ndev)
871                 return -ENOMEM;
872
873         priv = netdev_priv(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->open              = mpc52xx_fec_open;
894         ndev->stop              = mpc52xx_fec_close;
895         ndev->hard_start_xmit   = mpc52xx_fec_hard_start_xmit;
896         ndev->do_ioctl          = mpc52xx_fec_ioctl;
897         ndev->ethtool_ops       = &mpc52xx_fec_ethtool_ops;
898         ndev->get_stats         = mpc52xx_fec_get_stats;
899         ndev->set_mac_address   = mpc52xx_fec_set_mac_address;
900         ndev->set_multicast_list = mpc52xx_fec_set_multicast_list;
901         ndev->tx_timeout        = mpc52xx_fec_tx_timeout;
902         ndev->watchdog_timeo    = FEC_WATCHDOG_TIMEOUT;
903         ndev->base_addr         = mem.start;
904
905         priv->t_irq = priv->r_irq = ndev->irq = NO_IRQ; /* IRQ are free for now */
906
907         spin_lock_init(&priv->lock);
908
909         /* ioremap the zones */
910         priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));
911
912         if (!priv->fec) {
913                 rv = -ENOMEM;
914                 goto probe_error;
915         }
916
917         /* Bestcomm init */
918         rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
919         tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);
920
921         priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
922         priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);
923
924         if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
925                 printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
926                 rv = -ENOMEM;
927                 goto probe_error;
928         }
929
930         /* Get the IRQ we need one by one */
931                 /* Control */
932         ndev->irq = irq_of_parse_and_map(op->node, 0);
933
934                 /* RX */
935         priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);
936
937                 /* TX */
938         priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);
939
940         /* MAC address init */
941         if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
942                 memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
943         else
944                 mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);
945
946         priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
947         priv->duplex = DUPLEX_FULL;
948
949         /* is the phy present in device tree? */
950         ph = of_get_property(op->node, "phy-handle", NULL);
951         if (ph) {
952                 const unsigned int *prop;
953                 struct device_node *phy_dn;
954                 priv->has_phy = 1;
955
956                 phy_dn = of_find_node_by_phandle(*ph);
957                 prop = of_get_property(phy_dn, "reg", NULL);
958                 priv->phy_addr = *prop;
959
960                 of_node_put(phy_dn);
961
962                 /* Phy speed */
963                 priv->phy_speed = ((mpc52xx_find_ipb_freq(op->node) >> 20) / 5) << 1;
964         } else {
965                 dev_info(&ndev->dev, "can't find \"phy-handle\" in device"
966                                 " tree, using 7-wire mode\n");
967         }
968
969         /* Hardware init */
970         mpc52xx_fec_hw_init(ndev);
971
972         mpc52xx_fec_reset_stats(ndev);
973
974         /* Register the new network device */
975         rv = register_netdev(ndev);
976         if (rv < 0)
977                 goto probe_error;
978
979         /* We're done ! */
980         dev_set_drvdata(&op->dev, ndev);
981
982         return 0;
983
984
985         /* Error handling - free everything that might be allocated */
986 probe_error:
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         irq_dispose_mapping(ndev->irq);
1017
1018         bcom_fec_rx_release(priv->rx_dmatsk);
1019         bcom_fec_tx_release(priv->tx_dmatsk);
1020
1021         iounmap(priv->fec);
1022
1023         release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));
1024
1025         free_netdev(ndev);
1026
1027         dev_set_drvdata(&op->dev, NULL);
1028         return 0;
1029 }
1030
1031 #ifdef CONFIG_PM
1032 static int mpc52xx_fec_of_suspend(struct of_device *op, pm_message_t state)
1033 {
1034         struct net_device *dev = dev_get_drvdata(&op->dev);
1035
1036         if (netif_running(dev))
1037                 mpc52xx_fec_close(dev);
1038
1039         return 0;
1040 }
1041
1042 static int mpc52xx_fec_of_resume(struct of_device *op)
1043 {
1044         struct net_device *dev = dev_get_drvdata(&op->dev);
1045
1046         mpc52xx_fec_hw_init(dev);
1047         mpc52xx_fec_reset_stats(dev);
1048
1049         if (netif_running(dev))
1050                 mpc52xx_fec_open(dev);
1051
1052         return 0;
1053 }
1054 #endif
1055
1056 static struct of_device_id mpc52xx_fec_match[] = {
1057         {
1058                 .type           = "network",
1059                 .compatible     = "mpc5200-fec",
1060         },
1061         { }
1062 };
1063
1064 MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);
1065
1066 static struct of_platform_driver mpc52xx_fec_driver = {
1067         .owner          = THIS_MODULE,
1068         .name           = DRIVER_NAME,
1069         .match_table    = mpc52xx_fec_match,
1070         .probe          = mpc52xx_fec_probe,
1071         .remove         = mpc52xx_fec_remove,
1072 #ifdef CONFIG_PM
1073         .suspend        = mpc52xx_fec_of_suspend,
1074         .resume         = mpc52xx_fec_of_resume,
1075 #endif
1076 };
1077
1078
1079 /* ======================================================================== */
1080 /* Module                                                                   */
1081 /* ======================================================================== */
1082
1083 static int __init
1084 mpc52xx_fec_init(void)
1085 {
1086 #ifdef CONFIG_FEC_MPC52xx_MDIO
1087         int ret;
1088         ret = of_register_platform_driver(&mpc52xx_fec_mdio_driver);
1089         if (ret) {
1090                 printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
1091                 return ret;
1092         }
1093 #endif
1094         return of_register_platform_driver(&mpc52xx_fec_driver);
1095 }
1096
1097 static void __exit
1098 mpc52xx_fec_exit(void)
1099 {
1100         of_unregister_platform_driver(&mpc52xx_fec_driver);
1101 #ifdef CONFIG_FEC_MPC52xx_MDIO
1102         of_unregister_platform_driver(&mpc52xx_fec_mdio_driver);
1103 #endif
1104 }
1105
1106
1107 module_init(mpc52xx_fec_init);
1108 module_exit(mpc52xx_fec_exit);
1109
1110 MODULE_LICENSE("GPL");
1111 MODULE_AUTHOR("Dale Farnsworth");
1112 MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");