Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
[linux-2.6.git] / drivers / net / can / softing / softing_main.c
1 /*
2  * Copyright (C) 2008-2010
3  *
4  * - Kurt Van Dijck, EIA Electronics
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the version 2 of the GNU General Public License
8  * as published by the Free Software Foundation
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  */
19
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/interrupt.h>
23 #include <asm/io.h>
24
25 #include "softing.h"
26
27 #define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1)
28
29 /*
30  * test is a specific CAN netdev
31  * is online (ie. up 'n running, not sleeping, not busoff
32  */
33 static inline int canif_is_active(struct net_device *netdev)
34 {
35         struct can_priv *can = netdev_priv(netdev);
36
37         if (!netif_running(netdev))
38                 return 0;
39         return (can->state <= CAN_STATE_ERROR_PASSIVE);
40 }
41
42 /* reset DPRAM */
43 static inline void softing_set_reset_dpram(struct softing *card)
44 {
45         if (card->pdat->generation >= 2) {
46                 spin_lock_bh(&card->spin);
47                 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1,
48                                 &card->dpram[DPRAM_V2_RESET]);
49                 spin_unlock_bh(&card->spin);
50         }
51 }
52
53 static inline void softing_clr_reset_dpram(struct softing *card)
54 {
55         if (card->pdat->generation >= 2) {
56                 spin_lock_bh(&card->spin);
57                 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) | 1,
58                                 &card->dpram[DPRAM_V2_RESET]);
59                 spin_unlock_bh(&card->spin);
60         }
61 }
62
63 /* trigger the tx queue-ing */
64 static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb,
65                 struct net_device *dev)
66 {
67         struct softing_priv *priv = netdev_priv(dev);
68         struct softing *card = priv->card;
69         int ret;
70         uint8_t *ptr;
71         uint8_t fifo_wr, fifo_rd;
72         struct can_frame *cf = (struct can_frame *)skb->data;
73         uint8_t buf[DPRAM_TX_SIZE];
74
75         if (can_dropped_invalid_skb(dev, skb))
76                 return NETDEV_TX_OK;
77
78         spin_lock(&card->spin);
79
80         ret = NETDEV_TX_BUSY;
81         if (!card->fw.up ||
82                         (card->tx.pending >= TXMAX) ||
83                         (priv->tx.pending >= TX_ECHO_SKB_MAX))
84                 goto xmit_done;
85         fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]);
86         fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]);
87         if (fifo_wr == fifo_rd)
88                 /* fifo full */
89                 goto xmit_done;
90         memset(buf, 0, sizeof(buf));
91         ptr = buf;
92         *ptr = CMD_TX;
93         if (cf->can_id & CAN_RTR_FLAG)
94                 *ptr |= CMD_RTR;
95         if (cf->can_id & CAN_EFF_FLAG)
96                 *ptr |= CMD_XTD;
97         if (priv->index)
98                 *ptr |= CMD_BUS2;
99         ++ptr;
100         *ptr++ = cf->can_dlc;
101         *ptr++ = (cf->can_id >> 0);
102         *ptr++ = (cf->can_id >> 8);
103         if (cf->can_id & CAN_EFF_FLAG) {
104                 *ptr++ = (cf->can_id >> 16);
105                 *ptr++ = (cf->can_id >> 24);
106         } else {
107                 /* increment 1, not 2 as you might think */
108                 ptr += 1;
109         }
110         if (!(cf->can_id & CAN_RTR_FLAG))
111                 memcpy(ptr, &cf->data[0], cf->can_dlc);
112         memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr],
113                         buf, DPRAM_TX_SIZE);
114         if (++fifo_wr >= DPRAM_TX_CNT)
115                 fifo_wr = 0;
116         iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]);
117         card->tx.last_bus = priv->index;
118         ++card->tx.pending;
119         ++priv->tx.pending;
120         can_put_echo_skb(skb, dev, priv->tx.echo_put);
121         ++priv->tx.echo_put;
122         if (priv->tx.echo_put >= TX_ECHO_SKB_MAX)
123                 priv->tx.echo_put = 0;
124         /* can_put_echo_skb() saves the skb, safe to return TX_OK */
125         ret = NETDEV_TX_OK;
126 xmit_done:
127         spin_unlock(&card->spin);
128         if (card->tx.pending >= TXMAX) {
129                 int j;
130                 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
131                         if (card->net[j])
132                                 netif_stop_queue(card->net[j]);
133                 }
134         }
135         if (ret != NETDEV_TX_OK)
136                 netif_stop_queue(dev);
137
138         return ret;
139 }
140
141 /*
142  * shortcut for skb delivery
143  */
144 int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg,
145                 ktime_t ktime)
146 {
147         struct sk_buff *skb;
148         struct can_frame *cf;
149
150         skb = alloc_can_skb(netdev, &cf);
151         if (!skb)
152                 return -ENOMEM;
153         memcpy(cf, msg, sizeof(*msg));
154         skb->tstamp = ktime;
155         return netif_rx(skb);
156 }
157
158 /*
159  * softing_handle_1
160  * pop 1 entry from the DPRAM queue, and process
161  */
162 static int softing_handle_1(struct softing *card)
163 {
164         struct net_device *netdev;
165         struct softing_priv *priv;
166         ktime_t ktime;
167         struct can_frame msg;
168         int cnt = 0, lost_msg;
169         uint8_t fifo_rd, fifo_wr, cmd;
170         uint8_t *ptr;
171         uint32_t tmp_u32;
172         uint8_t buf[DPRAM_RX_SIZE];
173
174         memset(&msg, 0, sizeof(msg));
175         /* test for lost msgs */
176         lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]);
177         if (lost_msg) {
178                 int j;
179                 /* reset condition */
180                 iowrite8(0, &card->dpram[DPRAM_RX_LOST]);
181                 /* prepare msg */
182                 msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL;
183                 msg.can_dlc = CAN_ERR_DLC;
184                 msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
185                 /*
186                  * service to all busses, we don't know which it was applicable
187                  * but only service busses that are online
188                  */
189                 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
190                         netdev = card->net[j];
191                         if (!netdev)
192                                 continue;
193                         if (!canif_is_active(netdev))
194                                 /* a dead bus has no overflows */
195                                 continue;
196                         ++netdev->stats.rx_over_errors;
197                         softing_netdev_rx(netdev, &msg, ktime_set(0, 0));
198                 }
199                 /* prepare for other use */
200                 memset(&msg, 0, sizeof(msg));
201                 ++cnt;
202         }
203
204         fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]);
205         fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]);
206
207         if (++fifo_rd >= DPRAM_RX_CNT)
208                 fifo_rd = 0;
209         if (fifo_wr == fifo_rd)
210                 return cnt;
211
212         memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd],
213                         DPRAM_RX_SIZE);
214         mb();
215         /* trigger dual port RAM */
216         iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]);
217
218         ptr = buf;
219         cmd = *ptr++;
220         if (cmd == 0xff)
221                 /* not quite useful, probably the card has got out */
222                 return 0;
223         netdev = card->net[0];
224         if (cmd & CMD_BUS2)
225                 netdev = card->net[1];
226         priv = netdev_priv(netdev);
227
228         if (cmd & CMD_ERR) {
229                 uint8_t can_state, state;
230
231                 state = *ptr++;
232
233                 msg.can_id = CAN_ERR_FLAG;
234                 msg.can_dlc = CAN_ERR_DLC;
235
236                 if (state & SF_MASK_BUSOFF) {
237                         can_state = CAN_STATE_BUS_OFF;
238                         msg.can_id |= CAN_ERR_BUSOFF;
239                         state = STATE_BUSOFF;
240                 } else if (state & SF_MASK_EPASSIVE) {
241                         can_state = CAN_STATE_ERROR_PASSIVE;
242                         msg.can_id |= CAN_ERR_CRTL;
243                         msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE;
244                         state = STATE_EPASSIVE;
245                 } else {
246                         can_state = CAN_STATE_ERROR_ACTIVE;
247                         msg.can_id |= CAN_ERR_CRTL;
248                         state = STATE_EACTIVE;
249                 }
250                 /* update DPRAM */
251                 iowrite8(state, &card->dpram[priv->index ?
252                                 DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]);
253                 /* timestamp */
254                 tmp_u32 = le32_to_cpup((void *)ptr);
255                 ptr += 4;
256                 ktime = softing_raw2ktime(card, tmp_u32);
257
258                 ++netdev->stats.rx_errors;
259                 /* update internal status */
260                 if (can_state != priv->can.state) {
261                         priv->can.state = can_state;
262                         if (can_state == CAN_STATE_ERROR_PASSIVE)
263                                 ++priv->can.can_stats.error_passive;
264                         else if (can_state == CAN_STATE_BUS_OFF) {
265                                 /* this calls can_close_cleanup() */
266                                 can_bus_off(netdev);
267                                 netif_stop_queue(netdev);
268                         }
269                         /* trigger socketcan */
270                         softing_netdev_rx(netdev, &msg, ktime);
271                 }
272
273         } else {
274                 if (cmd & CMD_RTR)
275                         msg.can_id |= CAN_RTR_FLAG;
276                 msg.can_dlc = get_can_dlc(*ptr++);
277                 if (cmd & CMD_XTD) {
278                         msg.can_id |= CAN_EFF_FLAG;
279                         msg.can_id |= le32_to_cpup((void *)ptr);
280                         ptr += 4;
281                 } else {
282                         msg.can_id |= le16_to_cpup((void *)ptr);
283                         ptr += 2;
284                 }
285                 /* timestamp */
286                 tmp_u32 = le32_to_cpup((void *)ptr);
287                 ptr += 4;
288                 ktime = softing_raw2ktime(card, tmp_u32);
289                 if (!(msg.can_id & CAN_RTR_FLAG))
290                         memcpy(&msg.data[0], ptr, 8);
291                 ptr += 8;
292                 /* update socket */
293                 if (cmd & CMD_ACK) {
294                         /* acknowledge, was tx msg */
295                         struct sk_buff *skb;
296                         skb = priv->can.echo_skb[priv->tx.echo_get];
297                         if (skb)
298                                 skb->tstamp = ktime;
299                         can_get_echo_skb(netdev, priv->tx.echo_get);
300                         ++priv->tx.echo_get;
301                         if (priv->tx.echo_get >= TX_ECHO_SKB_MAX)
302                                 priv->tx.echo_get = 0;
303                         if (priv->tx.pending)
304                                 --priv->tx.pending;
305                         if (card->tx.pending)
306                                 --card->tx.pending;
307                         ++netdev->stats.tx_packets;
308                         if (!(msg.can_id & CAN_RTR_FLAG))
309                                 netdev->stats.tx_bytes += msg.can_dlc;
310                 } else {
311                         int ret;
312
313                         ret = softing_netdev_rx(netdev, &msg, ktime);
314                         if (ret == NET_RX_SUCCESS) {
315                                 ++netdev->stats.rx_packets;
316                                 if (!(msg.can_id & CAN_RTR_FLAG))
317                                         netdev->stats.rx_bytes += msg.can_dlc;
318                         } else {
319                                 ++netdev->stats.rx_dropped;
320                         }
321                 }
322         }
323         ++cnt;
324         return cnt;
325 }
326
327 /*
328  * real interrupt handler
329  */
330 static irqreturn_t softing_irq_thread(int irq, void *dev_id)
331 {
332         struct softing *card = (struct softing *)dev_id;
333         struct net_device *netdev;
334         struct softing_priv *priv;
335         int j, offset, work_done;
336
337         work_done = 0;
338         spin_lock_bh(&card->spin);
339         while (softing_handle_1(card) > 0) {
340                 ++card->irq.svc_count;
341                 ++work_done;
342         }
343         spin_unlock_bh(&card->spin);
344         /* resume tx queue's */
345         offset = card->tx.last_bus;
346         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
347                 if (card->tx.pending >= TXMAX)
348                         break;
349                 netdev = card->net[(j + offset + 1) % card->pdat->nbus];
350                 if (!netdev)
351                         continue;
352                 priv = netdev_priv(netdev);
353                 if (!canif_is_active(netdev))
354                         /* it makes no sense to wake dead busses */
355                         continue;
356                 if (priv->tx.pending >= TX_ECHO_SKB_MAX)
357                         continue;
358                 ++work_done;
359                 netif_wake_queue(netdev);
360         }
361         return work_done ? IRQ_HANDLED : IRQ_NONE;
362 }
363
364 /*
365  * interrupt routines:
366  * schedule the 'real interrupt handler'
367  */
368 static irqreturn_t softing_irq_v2(int irq, void *dev_id)
369 {
370         struct softing *card = (struct softing *)dev_id;
371         uint8_t ir;
372
373         ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]);
374         iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]);
375         return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE;
376 }
377
378 static irqreturn_t softing_irq_v1(int irq, void *dev_id)
379 {
380         struct softing *card = (struct softing *)dev_id;
381         uint8_t ir;
382
383         ir = ioread8(&card->dpram[DPRAM_IRQ_TOHOST]);
384         iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]);
385         return ir ? IRQ_WAKE_THREAD : IRQ_NONE;
386 }
387
388 /*
389  * netdev/candev inter-operability
390  */
391 static int softing_netdev_open(struct net_device *ndev)
392 {
393         int ret;
394
395         /* check or determine and set bittime */
396         ret = open_candev(ndev);
397         if (!ret)
398                 ret = softing_startstop(ndev, 1);
399         return ret;
400 }
401
402 static int softing_netdev_stop(struct net_device *ndev)
403 {
404         int ret;
405
406         netif_stop_queue(ndev);
407
408         /* softing cycle does close_candev() */
409         ret = softing_startstop(ndev, 0);
410         return ret;
411 }
412
413 static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode)
414 {
415         int ret;
416
417         switch (mode) {
418         case CAN_MODE_START:
419                 /* softing_startstop does close_candev() */
420                 ret = softing_startstop(ndev, 1);
421                 return ret;
422         case CAN_MODE_STOP:
423         case CAN_MODE_SLEEP:
424                 return -EOPNOTSUPP;
425         }
426         return 0;
427 }
428
429 /*
430  * Softing device management helpers
431  */
432 int softing_enable_irq(struct softing *card, int enable)
433 {
434         int ret;
435
436         if (!card->irq.nr) {
437                 return 0;
438         } else if (card->irq.requested && !enable) {
439                 free_irq(card->irq.nr, card);
440                 card->irq.requested = 0;
441         } else if (!card->irq.requested && enable) {
442                 ret = request_threaded_irq(card->irq.nr,
443                                 (card->pdat->generation >= 2) ?
444                                         softing_irq_v2 : softing_irq_v1,
445                                 softing_irq_thread, IRQF_SHARED,
446                                 dev_name(&card->pdev->dev), card);
447                 if (ret) {
448                         dev_alert(&card->pdev->dev,
449                                         "request_threaded_irq(%u) failed\n",
450                                         card->irq.nr);
451                         return ret;
452                 }
453                 card->irq.requested = 1;
454         }
455         return 0;
456 }
457
458 static void softing_card_shutdown(struct softing *card)
459 {
460         int fw_up = 0;
461
462         if (mutex_lock_interruptible(&card->fw.lock))
463                 /* return -ERESTARTSYS */;
464         fw_up = card->fw.up;
465         card->fw.up = 0;
466
467         if (card->irq.requested && card->irq.nr) {
468                 free_irq(card->irq.nr, card);
469                 card->irq.requested = 0;
470         }
471         if (fw_up) {
472                 if (card->pdat->enable_irq)
473                         card->pdat->enable_irq(card->pdev, 0);
474                 softing_set_reset_dpram(card);
475                 if (card->pdat->reset)
476                         card->pdat->reset(card->pdev, 1);
477         }
478         mutex_unlock(&card->fw.lock);
479 }
480
481 static __devinit int softing_card_boot(struct softing *card)
482 {
483         int ret, j;
484         static const uint8_t stream[] = {
485                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, };
486         unsigned char back[sizeof(stream)];
487
488         if (mutex_lock_interruptible(&card->fw.lock))
489                 return -ERESTARTSYS;
490         if (card->fw.up) {
491                 mutex_unlock(&card->fw.lock);
492                 return 0;
493         }
494         /* reset board */
495         if (card->pdat->enable_irq)
496                 card->pdat->enable_irq(card->pdev, 1);
497         /* boot card */
498         softing_set_reset_dpram(card);
499         if (card->pdat->reset)
500                 card->pdat->reset(card->pdev, 1);
501         for (j = 0; (j + sizeof(stream)) < card->dpram_size;
502                         j += sizeof(stream)) {
503
504                 memcpy_toio(&card->dpram[j], stream, sizeof(stream));
505                 /* flush IO cache */
506                 mb();
507                 memcpy_fromio(back, &card->dpram[j], sizeof(stream));
508
509                 if (!memcmp(back, stream, sizeof(stream)))
510                         continue;
511                 /* memory is not equal */
512                 dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j);
513                 ret = -EIO;
514                 goto failed;
515         }
516         wmb();
517         /* load boot firmware */
518         ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram,
519                                 card->dpram_size,
520                                 card->pdat->boot.offs - card->pdat->boot.addr);
521         if (ret < 0)
522                 goto failed;
523         /* load loader firmware */
524         ret = softing_load_fw(card->pdat->load.fw, card, card->dpram,
525                                 card->dpram_size,
526                                 card->pdat->load.offs - card->pdat->load.addr);
527         if (ret < 0)
528                 goto failed;
529
530         if (card->pdat->reset)
531                 card->pdat->reset(card->pdev, 0);
532         softing_clr_reset_dpram(card);
533         ret = softing_bootloader_command(card, 0, "card boot");
534         if (ret < 0)
535                 goto failed;
536         ret = softing_load_app_fw(card->pdat->app.fw, card);
537         if (ret < 0)
538                 goto failed;
539
540         ret = softing_chip_poweron(card);
541         if (ret < 0)
542                 goto failed;
543
544         card->fw.up = 1;
545         mutex_unlock(&card->fw.lock);
546         return 0;
547 failed:
548         card->fw.up = 0;
549         if (card->pdat->enable_irq)
550                 card->pdat->enable_irq(card->pdev, 0);
551         softing_set_reset_dpram(card);
552         if (card->pdat->reset)
553                 card->pdat->reset(card->pdev, 1);
554         mutex_unlock(&card->fw.lock);
555         return ret;
556 }
557
558 /*
559  * netdev sysfs
560  */
561 static ssize_t show_channel(struct device *dev, struct device_attribute *attr,
562                 char *buf)
563 {
564         struct net_device *ndev = to_net_dev(dev);
565         struct softing_priv *priv = netdev2softing(ndev);
566
567         return sprintf(buf, "%i\n", priv->index);
568 }
569
570 static ssize_t show_chip(struct device *dev, struct device_attribute *attr,
571                 char *buf)
572 {
573         struct net_device *ndev = to_net_dev(dev);
574         struct softing_priv *priv = netdev2softing(ndev);
575
576         return sprintf(buf, "%i\n", priv->chip);
577 }
578
579 static ssize_t show_output(struct device *dev, struct device_attribute *attr,
580                 char *buf)
581 {
582         struct net_device *ndev = to_net_dev(dev);
583         struct softing_priv *priv = netdev2softing(ndev);
584
585         return sprintf(buf, "0x%02x\n", priv->output);
586 }
587
588 static ssize_t store_output(struct device *dev, struct device_attribute *attr,
589                 const char *buf, size_t count)
590 {
591         struct net_device *ndev = to_net_dev(dev);
592         struct softing_priv *priv = netdev2softing(ndev);
593         struct softing *card = priv->card;
594         unsigned long val;
595         int ret;
596
597         ret = strict_strtoul(buf, 0, &val);
598         if (ret < 0)
599                 return ret;
600         val &= 0xFF;
601
602         ret = mutex_lock_interruptible(&card->fw.lock);
603         if (ret)
604                 return -ERESTARTSYS;
605         if (netif_running(ndev)) {
606                 mutex_unlock(&card->fw.lock);
607                 return -EBUSY;
608         }
609         priv->output = val;
610         mutex_unlock(&card->fw.lock);
611         return count;
612 }
613
614 static const DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL);
615 static const DEVICE_ATTR(chip, S_IRUGO, show_chip, NULL);
616 static const DEVICE_ATTR(output, S_IRUGO | S_IWUSR, show_output, store_output);
617
618 static const struct attribute *const netdev_sysfs_attrs[] = {
619         &dev_attr_channel.attr,
620         &dev_attr_chip.attr,
621         &dev_attr_output.attr,
622         NULL,
623 };
624 static const struct attribute_group netdev_sysfs_group = {
625         .name = NULL,
626         .attrs = (struct attribute **)netdev_sysfs_attrs,
627 };
628
629 static const struct net_device_ops softing_netdev_ops = {
630         .ndo_open = softing_netdev_open,
631         .ndo_stop = softing_netdev_stop,
632         .ndo_start_xmit = softing_netdev_start_xmit,
633 };
634
635 static const struct can_bittiming_const softing_btr_const = {
636         .name = "softing",
637         .tseg1_min = 1,
638         .tseg1_max = 16,
639         .tseg2_min = 1,
640         .tseg2_max = 8,
641         .sjw_max = 4, /* overruled */
642         .brp_min = 1,
643         .brp_max = 32, /* overruled */
644         .brp_inc = 1,
645 };
646
647
648 static __devinit struct net_device *softing_netdev_create(struct softing *card,
649                 uint16_t chip_id)
650 {
651         struct net_device *netdev;
652         struct softing_priv *priv;
653
654         netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX);
655         if (!netdev) {
656                 dev_alert(&card->pdev->dev, "alloc_candev failed\n");
657                 return NULL;
658         }
659         priv = netdev_priv(netdev);
660         priv->netdev = netdev;
661         priv->card = card;
662         memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const));
663         priv->btr_const.brp_max = card->pdat->max_brp;
664         priv->btr_const.sjw_max = card->pdat->max_sjw;
665         priv->can.bittiming_const = &priv->btr_const;
666         priv->can.clock.freq = 8000000;
667         priv->chip = chip_id;
668         priv->output = softing_default_output(netdev);
669         SET_NETDEV_DEV(netdev, &card->pdev->dev);
670
671         netdev->flags |= IFF_ECHO;
672         netdev->netdev_ops = &softing_netdev_ops;
673         priv->can.do_set_mode = softing_candev_set_mode;
674         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
675
676         return netdev;
677 }
678
679 static __devinit int softing_netdev_register(struct net_device *netdev)
680 {
681         int ret;
682
683         netdev->sysfs_groups[0] = &netdev_sysfs_group;
684         ret = register_candev(netdev);
685         if (ret) {
686                 dev_alert(&netdev->dev, "register failed\n");
687                 return ret;
688         }
689         return 0;
690 }
691
692 static void softing_netdev_cleanup(struct net_device *netdev)
693 {
694         unregister_candev(netdev);
695         free_candev(netdev);
696 }
697
698 /*
699  * sysfs for Platform device
700  */
701 #define DEV_ATTR_RO(name, member) \
702 static ssize_t show_##name(struct device *dev, \
703                 struct device_attribute *attr, char *buf) \
704 { \
705         struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
706         return sprintf(buf, "%u\n", card->member); \
707 } \
708 static DEVICE_ATTR(name, 0444, show_##name, NULL)
709
710 #define DEV_ATTR_RO_STR(name, member) \
711 static ssize_t show_##name(struct device *dev, \
712                 struct device_attribute *attr, char *buf) \
713 { \
714         struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
715         return sprintf(buf, "%s\n", card->member); \
716 } \
717 static DEVICE_ATTR(name, 0444, show_##name, NULL)
718
719 DEV_ATTR_RO(serial, id.serial);
720 DEV_ATTR_RO_STR(firmware, pdat->app.fw);
721 DEV_ATTR_RO(firmware_version, id.fw_version);
722 DEV_ATTR_RO_STR(hardware, pdat->name);
723 DEV_ATTR_RO(hardware_version, id.hw_version);
724 DEV_ATTR_RO(license, id.license);
725 DEV_ATTR_RO(frequency, id.freq);
726 DEV_ATTR_RO(txpending, tx.pending);
727
728 static struct attribute *softing_pdev_attrs[] = {
729         &dev_attr_serial.attr,
730         &dev_attr_firmware.attr,
731         &dev_attr_firmware_version.attr,
732         &dev_attr_hardware.attr,
733         &dev_attr_hardware_version.attr,
734         &dev_attr_license.attr,
735         &dev_attr_frequency.attr,
736         &dev_attr_txpending.attr,
737         NULL,
738 };
739
740 static const struct attribute_group softing_pdev_group = {
741         .name = NULL,
742         .attrs = softing_pdev_attrs,
743 };
744
745 /*
746  * platform driver
747  */
748 static __devexit int softing_pdev_remove(struct platform_device *pdev)
749 {
750         struct softing *card = platform_get_drvdata(pdev);
751         int j;
752
753         /* first, disable card*/
754         softing_card_shutdown(card);
755
756         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
757                 if (!card->net[j])
758                         continue;
759                 softing_netdev_cleanup(card->net[j]);
760                 card->net[j] = NULL;
761         }
762         sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
763
764         iounmap(card->dpram);
765         kfree(card);
766         return 0;
767 }
768
769 static __devinit int softing_pdev_probe(struct platform_device *pdev)
770 {
771         const struct softing_platform_data *pdat = pdev->dev.platform_data;
772         struct softing *card;
773         struct net_device *netdev;
774         struct softing_priv *priv;
775         struct resource *pres;
776         int ret;
777         int j;
778
779         if (!pdat) {
780                 dev_warn(&pdev->dev, "no platform data\n");
781                 return -EINVAL;
782         }
783         if (pdat->nbus > ARRAY_SIZE(card->net)) {
784                 dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus);
785                 return -EINVAL;
786         }
787
788         card = kzalloc(sizeof(*card), GFP_KERNEL);
789         if (!card)
790                 return -ENOMEM;
791         card->pdat = pdat;
792         card->pdev = pdev;
793         platform_set_drvdata(pdev, card);
794         mutex_init(&card->fw.lock);
795         spin_lock_init(&card->spin);
796
797         ret = -EINVAL;
798         pres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
799         if (!pres)
800                 goto platform_resource_failed;
801         card->dpram_phys = pres->start;
802         card->dpram_size = resource_size(pres);
803         card->dpram = ioremap_nocache(card->dpram_phys, card->dpram_size);
804         if (!card->dpram) {
805                 dev_alert(&card->pdev->dev, "dpram ioremap failed\n");
806                 goto ioremap_failed;
807         }
808
809         pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
810         if (pres)
811                 card->irq.nr = pres->start;
812
813         /* reset card */
814         ret = softing_card_boot(card);
815         if (ret < 0) {
816                 dev_alert(&pdev->dev, "failed to boot\n");
817                 goto boot_failed;
818         }
819
820         /* only now, the chip's are known */
821         card->id.freq = card->pdat->freq;
822
823         ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group);
824         if (ret < 0) {
825                 dev_alert(&card->pdev->dev, "sysfs failed\n");
826                 goto sysfs_failed;
827         }
828
829         ret = -ENOMEM;
830         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
831                 card->net[j] = netdev =
832                         softing_netdev_create(card, card->id.chip[j]);
833                 if (!netdev) {
834                         dev_alert(&pdev->dev, "failed to make can[%i]", j);
835                         goto netdev_failed;
836                 }
837                 priv = netdev_priv(card->net[j]);
838                 priv->index = j;
839                 ret = softing_netdev_register(netdev);
840                 if (ret) {
841                         free_candev(netdev);
842                         card->net[j] = NULL;
843                         dev_alert(&card->pdev->dev,
844                                         "failed to register can[%i]\n", j);
845                         goto netdev_failed;
846                 }
847         }
848         dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name);
849         return 0;
850
851 netdev_failed:
852         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
853                 if (!card->net[j])
854                         continue;
855                 softing_netdev_cleanup(card->net[j]);
856         }
857         sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
858 sysfs_failed:
859         softing_card_shutdown(card);
860 boot_failed:
861         iounmap(card->dpram);
862 ioremap_failed:
863 platform_resource_failed:
864         kfree(card);
865         return ret;
866 }
867
868 static struct platform_driver softing_driver = {
869         .driver = {
870                 .name = "softing",
871                 .owner = THIS_MODULE,
872         },
873         .probe = softing_pdev_probe,
874         .remove = __devexit_p(softing_pdev_remove),
875 };
876
877 MODULE_ALIAS("platform:softing");
878
879 static int __init softing_start(void)
880 {
881         return platform_driver_register(&softing_driver);
882 }
883
884 static void __exit softing_stop(void)
885 {
886         platform_driver_unregister(&softing_driver);
887 }
888
889 module_init(softing_start);
890 module_exit(softing_stop);
891
892 MODULE_DESCRIPTION("Softing DPRAM CAN driver");
893 MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>");
894 MODULE_LICENSE("GPL v2");