projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
can: Unify MTU settings for CAN interfaces
[deliverable/linux.git] / drivers / net / can / softing / softing_main.c
CommitLineData
03fd3cf5
KVD		 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
05780d98 16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
03fd3cf5
KVD		 17 */
18
03fd3cf5 19#include <linux/module.h>
03fd3cf5 20#include <linux/interrupt.h>
b7f080cf 21#include <asm/io.h>
03fd3cf5
KVD		 22
23#include "softing.h"
24
25#define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1)
26
27/*
28 * test is a specific CAN netdev
29 * is online (ie. up 'n running, not sleeping, not busoff
30 */
31static inline int canif_is_active(struct net_device *netdev)
32{
33 struct can_priv *can = netdev_priv(netdev);
34
35 if (!netif_running(netdev))
36 return 0;
37 return (can->state <= CAN_STATE_ERROR_PASSIVE);
38}
39
40/* reset DPRAM */
41static inline void softing_set_reset_dpram(struct softing *card)
42{
43 if (card->pdat->generation >= 2) {
44 spin_lock_bh(&card->spin);
45 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1,
46 &card->dpram[DPRAM_V2_RESET]);
47 spin_unlock_bh(&card->spin);
48 }
49}
50
51static inline void softing_clr_reset_dpram(struct softing *card)
52{
53 if (card->pdat->generation >= 2) {
54 spin_lock_bh(&card->spin);
55 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) | 1,
56 &card->dpram[DPRAM_V2_RESET]);
57 spin_unlock_bh(&card->spin);
58 }
59}
60
61/* trigger the tx queue-ing */
62static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb,
63 struct net_device *dev)
64{
65 struct softing_priv *priv = netdev_priv(dev);
66 struct softing *card = priv->card;
67 int ret;
68 uint8_t *ptr;
69 uint8_t fifo_wr, fifo_rd;
70 struct can_frame *cf = (struct can_frame *)skb->data;
71 uint8_t buf[DPRAM_TX_SIZE];
72
73 if (can_dropped_invalid_skb(dev, skb))
74 return NETDEV_TX_OK;
75
76 spin_lock(&card->spin);
77
78 ret = NETDEV_TX_BUSY;
79 if (!card->fw.up ||
80 (card->tx.pending >= TXMAX) ||
81 (priv->tx.pending >= TX_ECHO_SKB_MAX))
82 goto xmit_done;
83 fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]);
84 fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]);
85 if (fifo_wr == fifo_rd)
86 /* fifo full */
87 goto xmit_done;
88 memset(buf, 0, sizeof(buf));
89 ptr = buf;
90 *ptr = CMD_TX;
91 if (cf->can_id & CAN_RTR_FLAG)
92 *ptr |= CMD_RTR;
93 if (cf->can_id & CAN_EFF_FLAG)
94 *ptr |= CMD_XTD;
95 if (priv->index)
96 *ptr |= CMD_BUS2;
97 ++ptr;
98 *ptr++ = cf->can_dlc;
99 *ptr++ = (cf->can_id >> 0);
100 *ptr++ = (cf->can_id >> 8);
101 if (cf->can_id & CAN_EFF_FLAG) {
102 *ptr++ = (cf->can_id >> 16);
103 *ptr++ = (cf->can_id >> 24);
104 } else {
105 /* increment 1, not 2 as you might think */
106 ptr += 1;
107 }
108 if (!(cf->can_id & CAN_RTR_FLAG))
109 memcpy(ptr, &cf->data[0], cf->can_dlc);
110 memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr],
111 buf, DPRAM_TX_SIZE);
112 if (++fifo_wr >= DPRAM_TX_CNT)
113 fifo_wr = 0;
114 iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]);
115 card->tx.last_bus = priv->index;
116 ++card->tx.pending;
117 ++priv->tx.pending;
118 can_put_echo_skb(skb, dev, priv->tx.echo_put);
119 ++priv->tx.echo_put;
120 if (priv->tx.echo_put >= TX_ECHO_SKB_MAX)
121 priv->tx.echo_put = 0;
122 /* can_put_echo_skb() saves the skb, safe to return TX_OK */
123 ret = NETDEV_TX_OK;
124xmit_done:
125 spin_unlock(&card->spin);
126 if (card->tx.pending >= TXMAX) {
127 int j;
128 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
129 if (card->net[j])
130 netif_stop_queue(card->net[j]);
131 }
132 }
133 if (ret != NETDEV_TX_OK)
134 netif_stop_queue(dev);
135
136 return ret;
137}
138
139/*
140 * shortcut for skb delivery
141 */
142int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg,
143 ktime_t ktime)
144{
145 struct sk_buff *skb;
146 struct can_frame *cf;
147
148 skb = alloc_can_skb(netdev, &cf);
149 if (!skb)
150 return -ENOMEM;
151 memcpy(cf, msg, sizeof(*msg));
152 skb->tstamp = ktime;
153 return netif_rx(skb);
154}
155
156/*
157 * softing_handle_1
158 * pop 1 entry from the DPRAM queue, and process
159 */
160static int softing_handle_1(struct softing *card)
161{
162 struct net_device *netdev;
163 struct softing_priv *priv;
164 ktime_t ktime;
165 struct can_frame msg;
166 int cnt = 0, lost_msg;
167 uint8_t fifo_rd, fifo_wr, cmd;
168 uint8_t *ptr;
169 uint32_t tmp_u32;
170 uint8_t buf[DPRAM_RX_SIZE];
171
172 memset(&msg, 0, sizeof(msg));
173 /* test for lost msgs */
174 lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]);
175 if (lost_msg) {
176 int j;
177 /* reset condition */
178 iowrite8(0, &card->dpram[DPRAM_RX_LOST]);
179 /* prepare msg */
180 msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL;
181 msg.can_dlc = CAN_ERR_DLC;
182 msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
183 /*
184 * service to all busses, we don't know which it was applicable
185 * but only service busses that are online
186 */
187 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
188 netdev = card->net[j];
189 if (!netdev)
190 continue;
191 if (!canif_is_active(netdev))
192 /* a dead bus has no overflows */
193 continue;
194 ++netdev->stats.rx_over_errors;
195 softing_netdev_rx(netdev, &msg, ktime_set(0, 0));
196 }
197 /* prepare for other use */
198 memset(&msg, 0, sizeof(msg));
199 ++cnt;
200 }
201
202 fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]);
203 fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]);
204
205 if (++fifo_rd >= DPRAM_RX_CNT)
206 fifo_rd = 0;
207 if (fifo_wr == fifo_rd)
208 return cnt;
209
210 memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd],
211 DPRAM_RX_SIZE);
212 mb();
213 /* trigger dual port RAM */
214 iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]);
215
216 ptr = buf;
217 cmd = *ptr++;
218 if (cmd == 0xff)
25985edc 219 /* not quite useful, probably the card has got out */
03fd3cf5
KVD		 220 return 0;
221 netdev = card->net[0];
222 if (cmd & CMD_BUS2)
223 netdev = card->net[1];
224 priv = netdev_priv(netdev);
225
226 if (cmd & CMD_ERR) {
227 uint8_t can_state, state;
228
229 state = *ptr++;
230
231 msg.can_id = CAN_ERR_FLAG;
232 msg.can_dlc = CAN_ERR_DLC;
233
234 if (state & SF_MASK_BUSOFF) {
235 can_state = CAN_STATE_BUS_OFF;
236 msg.can_id |= CAN_ERR_BUSOFF;
237 state = STATE_BUSOFF;
238 } else if (state & SF_MASK_EPASSIVE) {
239 can_state = CAN_STATE_ERROR_PASSIVE;
240 msg.can_id |= CAN_ERR_CRTL;
241 msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE;
242 state = STATE_EPASSIVE;
243 } else {
244 can_state = CAN_STATE_ERROR_ACTIVE;
245 msg.can_id |= CAN_ERR_CRTL;
246 state = STATE_EACTIVE;
247 }
248 /* update DPRAM */
249 iowrite8(state, &card->dpram[priv->index ?
250 DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]);
251 /* timestamp */
252 tmp_u32 = le32_to_cpup((void *)ptr);
253 ptr += 4;
254 ktime = softing_raw2ktime(card, tmp_u32);
255
256 ++netdev->stats.rx_errors;
257 /* update internal status */
258 if (can_state != priv->can.state) {
259 priv->can.state = can_state;
260 if (can_state == CAN_STATE_ERROR_PASSIVE)
261 ++priv->can.can_stats.error_passive;
262 else if (can_state == CAN_STATE_BUS_OFF) {
263 /* this calls can_close_cleanup() */
264 can_bus_off(netdev);
265 netif_stop_queue(netdev);
266 }
267 /* trigger socketcan */
268 softing_netdev_rx(netdev, &msg, ktime);
269 }
270
271 } else {
272 if (cmd & CMD_RTR)
273 msg.can_id |= CAN_RTR_FLAG;
274 msg.can_dlc = get_can_dlc(*ptr++);
275 if (cmd & CMD_XTD) {
276 msg.can_id |= CAN_EFF_FLAG;
277 msg.can_id |= le32_to_cpup((void *)ptr);
278 ptr += 4;
279 } else {
280 msg.can_id |= le16_to_cpup((void *)ptr);
281 ptr += 2;
282 }
283 /* timestamp */
284 tmp_u32 = le32_to_cpup((void *)ptr);
285 ptr += 4;
286 ktime = softing_raw2ktime(card, tmp_u32);
287 if (!(msg.can_id & CAN_RTR_FLAG))
288 memcpy(&msg.data[0], ptr, 8);
289 ptr += 8;
290 /* update socket */
291 if (cmd & CMD_ACK) {
292 /* acknowledge, was tx msg */
293 struct sk_buff *skb;
294 skb = priv->can.echo_skb[priv->tx.echo_get];
295 if (skb)
296 skb->tstamp = ktime;
297 can_get_echo_skb(netdev, priv->tx.echo_get);
298 ++priv->tx.echo_get;
299 if (priv->tx.echo_get >= TX_ECHO_SKB_MAX)
300 priv->tx.echo_get = 0;
301 if (priv->tx.pending)
302 --priv->tx.pending;
303 if (card->tx.pending)
304 --card->tx.pending;
305 ++netdev->stats.tx_packets;
306 if (!(msg.can_id & CAN_RTR_FLAG))
307 netdev->stats.tx_bytes += msg.can_dlc;
308 } else {
309 int ret;
310
311 ret = softing_netdev_rx(netdev, &msg, ktime);
312 if (ret == NET_RX_SUCCESS) {
313 ++netdev->stats.rx_packets;
314 if (!(msg.can_id & CAN_RTR_FLAG))
315 netdev->stats.rx_bytes += msg.can_dlc;
316 } else {
317 ++netdev->stats.rx_dropped;
318 }
319 }
320 }
321 ++cnt;
322 return cnt;
323}
324
325/*
326 * real interrupt handler
327 */
328static irqreturn_t softing_irq_thread(int irq, void *dev_id)
329{
330 struct softing *card = (struct softing *)dev_id;
331 struct net_device *netdev;
332 struct softing_priv *priv;
333 int j, offset, work_done;
334
335 work_done = 0;
336 spin_lock_bh(&card->spin);
337 while (softing_handle_1(card) > 0) {
338 ++card->irq.svc_count;
339 ++work_done;
340 }
341 spin_unlock_bh(&card->spin);
342 /* resume tx queue's */
343 offset = card->tx.last_bus;
344 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
345 if (card->tx.pending >= TXMAX)
346 break;
347 netdev = card->net[(j + offset + 1) % card->pdat->nbus];
348 if (!netdev)
349 continue;
350 priv = netdev_priv(netdev);
351 if (!canif_is_active(netdev))
352 /* it makes no sense to wake dead busses */
353 continue;
354 if (priv->tx.pending >= TX_ECHO_SKB_MAX)
355 continue;
356 ++work_done;
357 netif_wake_queue(netdev);
358 }
359 return work_done ? IRQ_HANDLED : IRQ_NONE;
360}
361
362/*
363 * interrupt routines:
364 * schedule the 'real interrupt handler'
365 */
366static irqreturn_t softing_irq_v2(int irq, void *dev_id)
367{
368 struct softing *card = (struct softing *)dev_id;
369 uint8_t ir;
370
371 ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]);
372 iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]);
373 return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE;
374}
375
376static irqreturn_t softing_irq_v1(int irq, void *dev_id)
377{
378 struct softing *card = (struct softing *)dev_id;
379 uint8_t ir;
380
381 ir = ioread8(&card->dpram[DPRAM_IRQ_TOHOST]);
382 iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]);
383 return ir ? IRQ_WAKE_THREAD : IRQ_NONE;
384}
385
386/*
387 * netdev/candev inter-operability
388 */
389static int softing_netdev_open(struct net_device *ndev)
390{
391 int ret;
392
393 /* check or determine and set bittime */
394 ret = open_candev(ndev);
395 if (!ret)
396 ret = softing_startstop(ndev, 1);
397 return ret;
398}
399
400static int softing_netdev_stop(struct net_device *ndev)
401{
402 int ret;
403
404 netif_stop_queue(ndev);
405
406 /* softing cycle does close_candev() */
407 ret = softing_startstop(ndev, 0);
408 return ret;
409}
410
411static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode)
412{
413 int ret;
414
415 switch (mode) {
416 case CAN_MODE_START:
417 /* softing_startstop does close_candev() */
418 ret = softing_startstop(ndev, 1);
419 return ret;
420 case CAN_MODE_STOP:
421 case CAN_MODE_SLEEP:
422 return -EOPNOTSUPP;
423 }
424 return 0;
425}
426
427/*
428 * Softing device management helpers
429 */
430int softing_enable_irq(struct softing *card, int enable)
431{
432 int ret;
433
434 if (!card->irq.nr) {
435 return 0;
436 } else if (card->irq.requested && !enable) {
437 free_irq(card->irq.nr, card);
438 card->irq.requested = 0;
439 } else if (!card->irq.requested && enable) {
440 ret = request_threaded_irq(card->irq.nr,
441 (card->pdat->generation >= 2) ?
442 softing_irq_v2 : softing_irq_v1,
443 softing_irq_thread, IRQF_SHARED,
444 dev_name(&card->pdev->dev), card);
445 if (ret) {
446 dev_alert(&card->pdev->dev,
447 "request_threaded_irq(%u) failed\n",
448 card->irq.nr);
449 return ret;
450 }
451 card->irq.requested = 1;
452 }
453 return 0;
454}
455
456static void softing_card_shutdown(struct softing *card)
457{
458 int fw_up = 0;
459
460 if (mutex_lock_interruptible(&card->fw.lock))
461 /* return -ERESTARTSYS */;
462 fw_up = card->fw.up;
463 card->fw.up = 0;
464
465 if (card->irq.requested && card->irq.nr) {
466 free_irq(card->irq.nr, card);
467 card->irq.requested = 0;
468 }
469 if (fw_up) {
470 if (card->pdat->enable_irq)
471 card->pdat->enable_irq(card->pdev, 0);
472 softing_set_reset_dpram(card);
473 if (card->pdat->reset)
474 card->pdat->reset(card->pdev, 1);
475 }
476 mutex_unlock(&card->fw.lock);
477}
478
3c8ac0f2 479static int softing_card_boot(struct softing *card)
03fd3cf5
KVD		 480{
481 int ret, j;
482 static const uint8_t stream[] = {
483 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, };
484 unsigned char back[sizeof(stream)];
485
486 if (mutex_lock_interruptible(&card->fw.lock))
487 return -ERESTARTSYS;
488 if (card->fw.up) {
489 mutex_unlock(&card->fw.lock);
490 return 0;
491 }
492 /* reset board */
493 if (card->pdat->enable_irq)
494 card->pdat->enable_irq(card->pdev, 1);
495 /* boot card */
496 softing_set_reset_dpram(card);
497 if (card->pdat->reset)
498 card->pdat->reset(card->pdev, 1);
499 for (j = 0; (j + sizeof(stream)) < card->dpram_size;
500 j += sizeof(stream)) {
501
502 memcpy_toio(&card->dpram[j], stream, sizeof(stream));
503 /* flush IO cache */
504 mb();
505 memcpy_fromio(back, &card->dpram[j], sizeof(stream));
506
507 if (!memcmp(back, stream, sizeof(stream)))
508 continue;
509 /* memory is not equal */
510 dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j);
511 ret = -EIO;
512 goto failed;
513 }
514 wmb();
515 /* load boot firmware */
516 ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram,
517 card->dpram_size,
518 card->pdat->boot.offs - card->pdat->boot.addr);
519 if (ret < 0)
520 goto failed;
521 /* load loader firmware */
522 ret = softing_load_fw(card->pdat->load.fw, card, card->dpram,
523 card->dpram_size,
524 card->pdat->load.offs - card->pdat->load.addr);
525 if (ret < 0)
526 goto failed;
527
528 if (card->pdat->reset)
529 card->pdat->reset(card->pdev, 0);
530 softing_clr_reset_dpram(card);
531 ret = softing_bootloader_command(card, 0, "card boot");
532 if (ret < 0)
533 goto failed;
534 ret = softing_load_app_fw(card->pdat->app.fw, card);
535 if (ret < 0)
536 goto failed;
537
538 ret = softing_chip_poweron(card);
539 if (ret < 0)
540 goto failed;
541
542 card->fw.up = 1;
543 mutex_unlock(&card->fw.lock);
544 return 0;
545failed:
546 card->fw.up = 0;
547 if (card->pdat->enable_irq)
548 card->pdat->enable_irq(card->pdev, 0);
549 softing_set_reset_dpram(card);
550 if (card->pdat->reset)
551 card->pdat->reset(card->pdev, 1);
552 mutex_unlock(&card->fw.lock);
553 return ret;
554}
555
556/*
557 * netdev sysfs
558 */
559static ssize_t show_channel(struct device *dev, struct device_attribute *attr,
560 char *buf)
561{
562 struct net_device *ndev = to_net_dev(dev);
563 struct softing_priv *priv = netdev2softing(ndev);
564
565 return sprintf(buf, "%i\n", priv->index);
566}
567
568static ssize_t show_chip(struct device *dev, struct device_attribute *attr,
569 char *buf)
570{
571 struct net_device *ndev = to_net_dev(dev);
572 struct softing_priv *priv = netdev2softing(ndev);
573
574 return sprintf(buf, "%i\n", priv->chip);
575}
576
577static ssize_t show_output(struct device *dev, struct device_attribute *attr,
578 char *buf)
579{
580 struct net_device *ndev = to_net_dev(dev);
581 struct softing_priv *priv = netdev2softing(ndev);
582
583 return sprintf(buf, "0x%02x\n", priv->output);
584}
585
586static ssize_t store_output(struct device *dev, struct device_attribute *attr,
587 const char *buf, size_t count)
588{
589 struct net_device *ndev = to_net_dev(dev);
590 struct softing_priv *priv = netdev2softing(ndev);
591 struct softing *card = priv->card;
592 unsigned long val;
593 int ret;
594
0672f0ab 595 ret = kstrtoul(buf, 0, &val);
03fd3cf5
KVD		 596 if (ret < 0)
597 return ret;
598 val &= 0xFF;
599
600 ret = mutex_lock_interruptible(&card->fw.lock);
601 if (ret)
602 return -ERESTARTSYS;
603 if (netif_running(ndev)) {
604 mutex_unlock(&card->fw.lock);
605 return -EBUSY;
606 }
607 priv->output = val;
608 mutex_unlock(&card->fw.lock);
609 return count;
610}
611
612static const DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL);
613static const DEVICE_ATTR(chip, S_IRUGO, show_chip, NULL);
614static const DEVICE_ATTR(output, S_IRUGO | S_IWUSR, show_output, store_output);
615
616static const struct attribute *const netdev_sysfs_attrs[] = {
617 &dev_attr_channel.attr,
618 &dev_attr_chip.attr,
619 &dev_attr_output.attr,
620 NULL,
621};
622static const struct attribute_group netdev_sysfs_group = {
623 .name = NULL,
624 .attrs = (struct attribute **)netdev_sysfs_attrs,
625};
626
627static const struct net_device_ops softing_netdev_ops = {
628 .ndo_open = softing_netdev_open,
629 .ndo_stop = softing_netdev_stop,
630 .ndo_start_xmit = softing_netdev_start_xmit,
c971fa2a 631 .ndo_change_mtu = can_change_mtu,
03fd3cf5
KVD		 632};
633
634static const struct can_bittiming_const softing_btr_const = {
dad3d44d 635 .name = "softing",
03fd3cf5
KVD		 636 .tseg1_min = 1,
637 .tseg1_max = 16,
638 .tseg2_min = 1,
639 .tseg2_max = 8,
640 .sjw_max = 4, /* overruled */
641 .brp_min = 1,
642 .brp_max = 32, /* overruled */
643 .brp_inc = 1,
644};
645
646
3c8ac0f2 647static struct net_device *softing_netdev_create(struct softing *card,
1dd06ae8 648 uint16_t chip_id)
03fd3cf5
KVD		 649{
650 struct net_device *netdev;
651 struct softing_priv *priv;
652
653 netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX);
654 if (!netdev) {
655 dev_alert(&card->pdev->dev, "alloc_candev failed\n");
656 return NULL;
657 }
658 priv = netdev_priv(netdev);
659 priv->netdev = netdev;
660 priv->card = card;
661 memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const));
662 priv->btr_const.brp_max = card->pdat->max_brp;
663 priv->btr_const.sjw_max = card->pdat->max_sjw;
664 priv->can.bittiming_const = &priv->btr_const;
665 priv->can.clock.freq = 8000000;
666 priv->chip = chip_id;
667 priv->output = softing_default_output(netdev);
668 SET_NETDEV_DEV(netdev, &card->pdev->dev);
669
670 netdev->flags |= IFF_ECHO;
671 netdev->netdev_ops = &softing_netdev_ops;
672 priv->can.do_set_mode = softing_candev_set_mode;
673 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
674
675 return netdev;
676}
677
3c8ac0f2 678static int softing_netdev_register(struct net_device *netdev)
03fd3cf5
KVD		 679{
680 int ret;
681
682 netdev->sysfs_groups[0] = &netdev_sysfs_group;
683 ret = register_candev(netdev);
684 if (ret) {
685 dev_alert(&netdev->dev, "register failed\n");
686 return ret;
687 }
688 return 0;
689}
690
691static void softing_netdev_cleanup(struct net_device *netdev)
692{
693 unregister_candev(netdev);
694 free_candev(netdev);
695}
696
697/*
698 * sysfs for Platform device
699 */
700#define DEV_ATTR_RO(name, member) \
701static ssize_t show_##name(struct device *dev, \
702 struct device_attribute *attr, char *buf) \
703{ \
704 struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
705 return sprintf(buf, "%u\n", card->member); \
706} \
707static DEVICE_ATTR(name, 0444, show_##name, NULL)
708
709#define DEV_ATTR_RO_STR(name, member) \
710static ssize_t show_##name(struct device *dev, \
711 struct device_attribute *attr, char *buf) \
712{ \
713 struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
714 return sprintf(buf, "%s\n", card->member); \
715} \
716static DEVICE_ATTR(name, 0444, show_##name, NULL)
717
718DEV_ATTR_RO(serial, id.serial);
719DEV_ATTR_RO_STR(firmware, pdat->app.fw);
720DEV_ATTR_RO(firmware_version, id.fw_version);
721DEV_ATTR_RO_STR(hardware, pdat->name);
722DEV_ATTR_RO(hardware_version, id.hw_version);
723DEV_ATTR_RO(license, id.license);
724DEV_ATTR_RO(frequency, id.freq);
725DEV_ATTR_RO(txpending, tx.pending);
726
727static struct attribute *softing_pdev_attrs[] = {
728 &dev_attr_serial.attr,
729 &dev_attr_firmware.attr,
730 &dev_attr_firmware_version.attr,
731 &dev_attr_hardware.attr,
732 &dev_attr_hardware_version.attr,
733 &dev_attr_license.attr,
734 &dev_attr_frequency.attr,
735 &dev_attr_txpending.attr,
736 NULL,
737};
738
739static const struct attribute_group softing_pdev_group = {
740 .name = NULL,
741 .attrs = softing_pdev_attrs,
742};
743
744/*
745 * platform driver
746 */
3c8ac0f2 747static int softing_pdev_remove(struct platform_device *pdev)
03fd3cf5
KVD		 748{
749 struct softing *card = platform_get_drvdata(pdev);
750 int j;
751
752 /* first, disable card*/
753 softing_card_shutdown(card);
754
755 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
756 if (!card->net[j])
757 continue;
758 softing_netdev_cleanup(card->net[j]);
759 card->net[j] = NULL;
760 }
761 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
762
763 iounmap(card->dpram);
764 kfree(card);
765 return 0;
766}
767
3c8ac0f2 768static int softing_pdev_probe(struct platform_device *pdev)
03fd3cf5 769{
c58bd858 770 const struct softing_platform_data *pdat = dev_get_platdata(&pdev->dev);
03fd3cf5
KVD		 771 struct softing *card;
772 struct net_device *netdev;
773 struct softing_priv *priv;
774 struct resource *pres;
775 int ret;
776 int j;
777
778 if (!pdat) {
779 dev_warn(&pdev->dev, "no platform data\n");
780 return -EINVAL;
781 }
782 if (pdat->nbus > ARRAY_SIZE(card->net)) {
783 dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus);
784 return -EINVAL;
785 }
786
787 card = kzalloc(sizeof(*card), GFP_KERNEL);
788 if (!card)
789 return -ENOMEM;
790 card->pdat = pdat;
791 card->pdev = pdev;
792 platform_set_drvdata(pdev, card);
793 mutex_init(&card->fw.lock);
794 spin_lock_init(&card->spin);
795
796 ret = -EINVAL;
797 pres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
798 if (!pres)
6eab04a8 799 goto platform_resource_failed;
03fd3cf5 800 card->dpram_phys = pres->start;
28f65c11 801 card->dpram_size = resource_size(pres);
03fd3cf5
KVD		 802 card->dpram = ioremap_nocache(card->dpram_phys, card->dpram_size);
803 if (!card->dpram) {
804 dev_alert(&card->pdev->dev, "dpram ioremap failed\n");
805 goto ioremap_failed;
806 }
807
808 pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
809 if (pres)
810 card->irq.nr = pres->start;
811
812 /* reset card */
813 ret = softing_card_boot(card);
814 if (ret < 0) {
815 dev_alert(&pdev->dev, "failed to boot\n");
816 goto boot_failed;
817 }
818
819 /* only now, the chip's are known */
820 card->id.freq = card->pdat->freq;
821
822 ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group);
823 if (ret < 0) {
824 dev_alert(&card->pdev->dev, "sysfs failed\n");
825 goto sysfs_failed;
826 }
827
03fd3cf5
KVD		 828 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
829 card->net[j] = netdev =
830 softing_netdev_create(card, card->id.chip[j]);
831 if (!netdev) {
832 dev_alert(&pdev->dev, "failed to make can[%i]", j);
da78b799 833 ret = -ENOMEM;
03fd3cf5
KVD		 834 goto netdev_failed;
835 }
836 priv = netdev_priv(card->net[j]);
837 priv->index = j;
838 ret = softing_netdev_register(netdev);
839 if (ret) {
840 free_candev(netdev);
841 card->net[j] = NULL;
842 dev_alert(&card->pdev->dev,
843 "failed to register can[%i]\n", j);
844 goto netdev_failed;
845 }
846 }
847 dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name);
848 return 0;
849
850netdev_failed:
851 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
852 if (!card->net[j])
853 continue;
854 softing_netdev_cleanup(card->net[j]);
855 }
856 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
857sysfs_failed:
858 softing_card_shutdown(card);
859boot_failed:
860 iounmap(card->dpram);
861ioremap_failed:
862platform_resource_failed:
863 kfree(card);
864 return ret;
865}
866
867static struct platform_driver softing_driver = {
868 .driver = {
869 .name = "softing",
870 .owner = THIS_MODULE,
871 },
872 .probe = softing_pdev_probe,
3c8ac0f2 873 .remove = softing_pdev_remove,
03fd3cf5
KVD		 874};
875
871d3372 876module_platform_driver(softing_driver);
03fd3cf5 877
871d3372 878MODULE_ALIAS("platform:softing");
03fd3cf5
KVD		 879MODULE_DESCRIPTION("Softing DPRAM CAN driver");
880MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>");
881MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
This page took 0.268698 seconds and 5 git commands to generate.