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WIP FPC-III support
[linux/fpc-iii.git] / drivers / net / can / softing / softing_main.c
blob40070c930202b2601ab8550fdef52e32ecf9185c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2008-2010
4 *
5 * - Kurt Van Dijck, EIA Electronics
6 */
7
8 #include <linux/module.h>
9 #include <linux/interrupt.h>
10 #include <asm/io.h>
11
12 #include "softing.h"
13
14 #define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1)
15
16 /*
17 * test is a specific CAN netdev
18 * is online (ie. up 'n running, not sleeping, not busoff
19 */
20 static inline int canif_is_active(struct net_device *netdev)
21 {
22 struct can_priv *can = netdev_priv(netdev);
23
24 if (!netif_running(netdev))
25 return 0;
26 return (can->state <= CAN_STATE_ERROR_PASSIVE);
27 }
28
29 /* reset DPRAM */
30 static inline void softing_set_reset_dpram(struct softing *card)
31 {
32 if (card->pdat->generation >= 2) {
33 spin_lock_bh(&card->spin);
34 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1,
35 &card->dpram[DPRAM_V2_RESET]);
36 spin_unlock_bh(&card->spin);
37 }
38 }
39
40 static inline void softing_clr_reset_dpram(struct softing *card)
41 {
42 if (card->pdat->generation >= 2) {
43 spin_lock_bh(&card->spin);
44 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) | 1,
45 &card->dpram[DPRAM_V2_RESET]);
46 spin_unlock_bh(&card->spin);
47 }
48 }
49
50 /* trigger the tx queue-ing */
51 static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb,
52 struct net_device *dev)
53 {
54 struct softing_priv *priv = netdev_priv(dev);
55 struct softing *card = priv->card;
56 int ret;
57 uint8_t *ptr;
58 uint8_t fifo_wr, fifo_rd;
59 struct can_frame *cf = (struct can_frame *)skb->data;
60 uint8_t buf[DPRAM_TX_SIZE];
61
62 if (can_dropped_invalid_skb(dev, skb))
63 return NETDEV_TX_OK;
64
65 spin_lock(&card->spin);
66
67 ret = NETDEV_TX_BUSY;
68 if (!card->fw.up ||
69 (card->tx.pending >= TXMAX) ||
70 (priv->tx.pending >= TX_ECHO_SKB_MAX))
71 goto xmit_done;
72 fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]);
73 fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]);
74 if (fifo_wr == fifo_rd)
75 /* fifo full */
76 goto xmit_done;
77 memset(buf, 0, sizeof(buf));
78 ptr = buf;
79 *ptr = CMD_TX;
80 if (cf->can_id & CAN_RTR_FLAG)
81 *ptr |= CMD_RTR;
82 if (cf->can_id & CAN_EFF_FLAG)
83 *ptr |= CMD_XTD;
84 if (priv->index)
85 *ptr |= CMD_BUS2;
86 ++ptr;
87 *ptr++ = cf->len;
88 *ptr++ = (cf->can_id >> 0);
89 *ptr++ = (cf->can_id >> 8);
90 if (cf->can_id & CAN_EFF_FLAG) {
91 *ptr++ = (cf->can_id >> 16);
92 *ptr++ = (cf->can_id >> 24);
93 } else {
94 /* increment 1, not 2 as you might think */
95 ptr += 1;
96 }
97 if (!(cf->can_id & CAN_RTR_FLAG))
98 memcpy(ptr, &cf->data[0], cf->len);
99 memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr],
100 buf, DPRAM_TX_SIZE);
101 if (++fifo_wr >= DPRAM_TX_CNT)
102 fifo_wr = 0;
103 iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]);
104 card->tx.last_bus = priv->index;
105 ++card->tx.pending;
106 ++priv->tx.pending;
107 can_put_echo_skb(skb, dev, priv->tx.echo_put);
108 ++priv->tx.echo_put;
109 if (priv->tx.echo_put >= TX_ECHO_SKB_MAX)
110 priv->tx.echo_put = 0;
111 /* can_put_echo_skb() saves the skb, safe to return TX_OK */
112 ret = NETDEV_TX_OK;
113 xmit_done:
114 spin_unlock(&card->spin);
115 if (card->tx.pending >= TXMAX) {
116 int j;
117 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
118 if (card->net[j])
119 netif_stop_queue(card->net[j]);
120 }
121 }
122 if (ret != NETDEV_TX_OK)
123 netif_stop_queue(dev);
124
125 return ret;
126 }
127
128 /*
129 * shortcut for skb delivery
130 */
131 int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg,
132 ktime_t ktime)
133 {
134 struct sk_buff *skb;
135 struct can_frame *cf;
136
137 skb = alloc_can_skb(netdev, &cf);
138 if (!skb)
139 return -ENOMEM;
140 memcpy(cf, msg, sizeof(*msg));
141 skb->tstamp = ktime;
142 return netif_rx(skb);
143 }
144
145 /*
146 * softing_handle_1
147 * pop 1 entry from the DPRAM queue, and process
148 */
149 static int softing_handle_1(struct softing *card)
150 {
151 struct net_device *netdev;
152 struct softing_priv *priv;
153 ktime_t ktime;
154 struct can_frame msg;
155 int cnt = 0, lost_msg;
156 uint8_t fifo_rd, fifo_wr, cmd;
157 uint8_t *ptr;
158 uint32_t tmp_u32;
159 uint8_t buf[DPRAM_RX_SIZE];
160
161 memset(&msg, 0, sizeof(msg));
162 /* test for lost msgs */
163 lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]);
164 if (lost_msg) {
165 int j;
166 /* reset condition */
167 iowrite8(0, &card->dpram[DPRAM_RX_LOST]);
168 /* prepare msg */
169 msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL;
170 msg.len = CAN_ERR_DLC;
171 msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
172 /*
173 * service to all buses, we don't know which it was applicable
174 * but only service buses that are online
175 */
176 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
177 netdev = card->net[j];
178 if (!netdev)
179 continue;
180 if (!canif_is_active(netdev))
181 /* a dead bus has no overflows */
182 continue;
183 ++netdev->stats.rx_over_errors;
184 softing_netdev_rx(netdev, &msg, 0);
185 }
186 /* prepare for other use */
187 memset(&msg, 0, sizeof(msg));
188 ++cnt;
189 }
190
191 fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]);
192 fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]);
193
194 if (++fifo_rd >= DPRAM_RX_CNT)
195 fifo_rd = 0;
196 if (fifo_wr == fifo_rd)
197 return cnt;
198
199 memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd],
200 DPRAM_RX_SIZE);
201 mb();
202 /* trigger dual port RAM */
203 iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]);
204
205 ptr = buf;
206 cmd = *ptr++;
207 if (cmd == 0xff)
208 /* not quite useful, probably the card has got out */
209 return 0;
210 netdev = card->net[0];
211 if (cmd & CMD_BUS2)
212 netdev = card->net[1];
213 priv = netdev_priv(netdev);
214
215 if (cmd & CMD_ERR) {
216 uint8_t can_state, state;
217
218 state = *ptr++;
219
220 msg.can_id = CAN_ERR_FLAG;
221 msg.len = CAN_ERR_DLC;
222
223 if (state & SF_MASK_BUSOFF) {
224 can_state = CAN_STATE_BUS_OFF;
225 msg.can_id |= CAN_ERR_BUSOFF;
226 state = STATE_BUSOFF;
227 } else if (state & SF_MASK_EPASSIVE) {
228 can_state = CAN_STATE_ERROR_PASSIVE;
229 msg.can_id |= CAN_ERR_CRTL;
230 msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE;
231 state = STATE_EPASSIVE;
232 } else {
233 can_state = CAN_STATE_ERROR_ACTIVE;
234 msg.can_id |= CAN_ERR_CRTL;
235 state = STATE_EACTIVE;
236 }
237 /* update DPRAM */
238 iowrite8(state, &card->dpram[priv->index ?
239 DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]);
240 /* timestamp */
241 tmp_u32 = le32_to_cpup((void *)ptr);
242 ptr += 4;
243 ktime = softing_raw2ktime(card, tmp_u32);
244
245 ++netdev->stats.rx_errors;
246 /* update internal status */
247 if (can_state != priv->can.state) {
248 priv->can.state = can_state;
249 if (can_state == CAN_STATE_ERROR_PASSIVE)
250 ++priv->can.can_stats.error_passive;
251 else if (can_state == CAN_STATE_BUS_OFF) {
252 /* this calls can_close_cleanup() */
253 ++priv->can.can_stats.bus_off;
254 can_bus_off(netdev);
255 netif_stop_queue(netdev);
256 }
257 /* trigger socketcan */
258 softing_netdev_rx(netdev, &msg, ktime);
259 }
260
261 } else {
262 if (cmd & CMD_RTR)
263 msg.can_id |= CAN_RTR_FLAG;
264 msg.len = can_cc_dlc2len(*ptr++);
265 if (cmd & CMD_XTD) {
266 msg.can_id |= CAN_EFF_FLAG;
267 msg.can_id |= le32_to_cpup((void *)ptr);
268 ptr += 4;
269 } else {
270 msg.can_id |= le16_to_cpup((void *)ptr);
271 ptr += 2;
272 }
273 /* timestamp */
274 tmp_u32 = le32_to_cpup((void *)ptr);
275 ptr += 4;
276 ktime = softing_raw2ktime(card, tmp_u32);
277 if (!(msg.can_id & CAN_RTR_FLAG))
278 memcpy(&msg.data[0], ptr, 8);
279 ptr += 8;
280 /* update socket */
281 if (cmd & CMD_ACK) {
282 /* acknowledge, was tx msg */
283 struct sk_buff *skb;
284 skb = priv->can.echo_skb[priv->tx.echo_get];
285 if (skb)
286 skb->tstamp = ktime;
287 can_get_echo_skb(netdev, priv->tx.echo_get);
288 ++priv->tx.echo_get;
289 if (priv->tx.echo_get >= TX_ECHO_SKB_MAX)
290 priv->tx.echo_get = 0;
291 if (priv->tx.pending)
292 --priv->tx.pending;
293 if (card->tx.pending)
294 --card->tx.pending;
295 ++netdev->stats.tx_packets;
296 if (!(msg.can_id & CAN_RTR_FLAG))
297 netdev->stats.tx_bytes += msg.len;
298 } else {
299 int ret;
300
301 ret = softing_netdev_rx(netdev, &msg, ktime);
302 if (ret == NET_RX_SUCCESS) {
303 ++netdev->stats.rx_packets;
304 if (!(msg.can_id & CAN_RTR_FLAG))
305 netdev->stats.rx_bytes += msg.len;
306 } else {
307 ++netdev->stats.rx_dropped;
308 }
309 }
310 }
311 ++cnt;
312 return cnt;
313 }
314
315 /*
316 * real interrupt handler
317 */
318 static irqreturn_t softing_irq_thread(int irq, void *dev_id)
319 {
320 struct softing *card = (struct softing *)dev_id;
321 struct net_device *netdev;
322 struct softing_priv *priv;
323 int j, offset, work_done;
324
325 work_done = 0;
326 spin_lock_bh(&card->spin);
327 while (softing_handle_1(card) > 0) {
328 ++card->irq.svc_count;
329 ++work_done;
330 }
331 spin_unlock_bh(&card->spin);
332 /* resume tx queue's */
333 offset = card->tx.last_bus;
334 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
335 if (card->tx.pending >= TXMAX)
336 break;
337 netdev = card->net[(j + offset + 1) % card->pdat->nbus];
338 if (!netdev)
339 continue;
340 priv = netdev_priv(netdev);
341 if (!canif_is_active(netdev))
342 /* it makes no sense to wake dead buses */
343 continue;
344 if (priv->tx.pending >= TX_ECHO_SKB_MAX)
345 continue;
346 ++work_done;
347 netif_wake_queue(netdev);
348 }
349 return work_done ? IRQ_HANDLED : IRQ_NONE;
350 }
351
352 /*
353 * interrupt routines:
354 * schedule the 'real interrupt handler'
355 */
356 static irqreturn_t softing_irq_v2(int irq, void *dev_id)
357 {
358 struct softing *card = (struct softing *)dev_id;
359 uint8_t ir;
360
361 ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]);
362 iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]);
363 return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE;
364 }
365
366 static irqreturn_t softing_irq_v1(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_IRQ_TOHOST]);
372 iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]);
373 return ir ? IRQ_WAKE_THREAD : IRQ_NONE;
374 }
375
376 /*
377 * netdev/candev interoperability
378 */
379 static int softing_netdev_open(struct net_device *ndev)
380 {
381 int ret;
382
383 /* check or determine and set bittime */
384 ret = open_candev(ndev);
385 if (ret)
386 return ret;
387
388 ret = softing_startstop(ndev, 1);
389 if (ret < 0)
390 close_candev(ndev);
391
392 return ret;
393 }
394
395 static int softing_netdev_stop(struct net_device *ndev)
396 {
397 int ret;
398
399 netif_stop_queue(ndev);
400
401 /* softing cycle does close_candev() */
402 ret = softing_startstop(ndev, 0);
403 return ret;
404 }
405
406 static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode)
407 {
408 int ret;
409
410 switch (mode) {
411 case CAN_MODE_START:
412 /* softing_startstop does close_candev() */
413 ret = softing_startstop(ndev, 1);
414 return ret;
415 case CAN_MODE_STOP:
416 case CAN_MODE_SLEEP:
417 return -EOPNOTSUPP;
418 }
419 return 0;
420 }
421
422 /*
423 * Softing device management helpers
424 */
425 int softing_enable_irq(struct softing *card, int enable)
426 {
427 int ret;
428
429 if (!card->irq.nr) {
430 return 0;
431 } else if (card->irq.requested && !enable) {
432 free_irq(card->irq.nr, card);
433 card->irq.requested = 0;
434 } else if (!card->irq.requested && enable) {
435 ret = request_threaded_irq(card->irq.nr,
436 (card->pdat->generation >= 2) ?
437 softing_irq_v2 : softing_irq_v1,
438 softing_irq_thread, IRQF_SHARED,
439 dev_name(&card->pdev->dev), card);
440 if (ret) {
441 dev_alert(&card->pdev->dev,
442 "request_threaded_irq(%u) failed\n",
443 card->irq.nr);
444 return ret;
445 }
446 card->irq.requested = 1;
447 }
448 return 0;
449 }
450
451 static void softing_card_shutdown(struct softing *card)
452 {
453 int fw_up = 0;
454
455 if (mutex_lock_interruptible(&card->fw.lock)) {
456 /* return -ERESTARTSYS */;
457 }
458 fw_up = card->fw.up;
459 card->fw.up = 0;
460
461 if (card->irq.requested && card->irq.nr) {
462 free_irq(card->irq.nr, card);
463 card->irq.requested = 0;
464 }
465 if (fw_up) {
466 if (card->pdat->enable_irq)
467 card->pdat->enable_irq(card->pdev, 0);
468 softing_set_reset_dpram(card);
469 if (card->pdat->reset)
470 card->pdat->reset(card->pdev, 1);
471 }
472 mutex_unlock(&card->fw.lock);
473 }
474
475 static int softing_card_boot(struct softing *card)
476 {
477 int ret, j;
478 static const uint8_t stream[] = {
479 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, };
480 unsigned char back[sizeof(stream)];
481
482 if (mutex_lock_interruptible(&card->fw.lock))
483 return -ERESTARTSYS;
484 if (card->fw.up) {
485 mutex_unlock(&card->fw.lock);
486 return 0;
487 }
488 /* reset board */
489 if (card->pdat->enable_irq)
490 card->pdat->enable_irq(card->pdev, 1);
491 /* boot card */
492 softing_set_reset_dpram(card);
493 if (card->pdat->reset)
494 card->pdat->reset(card->pdev, 1);
495 for (j = 0; (j + sizeof(stream)) < card->dpram_size;
496 j += sizeof(stream)) {
497
498 memcpy_toio(&card->dpram[j], stream, sizeof(stream));
499 /* flush IO cache */
500 mb();
501 memcpy_fromio(back, &card->dpram[j], sizeof(stream));
502
503 if (!memcmp(back, stream, sizeof(stream)))
504 continue;
505 /* memory is not equal */
506 dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j);
507 ret = -EIO;
508 goto failed;
509 }
510 wmb();
511 /* load boot firmware */
512 ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram,
513 card->dpram_size,
514 card->pdat->boot.offs - card->pdat->boot.addr);
515 if (ret < 0)
516 goto failed;
517 /* load loader firmware */
518 ret = softing_load_fw(card->pdat->load.fw, card, card->dpram,
519 card->dpram_size,
520 card->pdat->load.offs - card->pdat->load.addr);
521 if (ret < 0)
522 goto failed;
523
524 if (card->pdat->reset)
525 card->pdat->reset(card->pdev, 0);
526 softing_clr_reset_dpram(card);
527 ret = softing_bootloader_command(card, 0, "card boot");
528 if (ret < 0)
529 goto failed;
530 ret = softing_load_app_fw(card->pdat->app.fw, card);
531 if (ret < 0)
532 goto failed;
533
534 ret = softing_chip_poweron(card);
535 if (ret < 0)
536 goto failed;
537
538 card->fw.up = 1;
539 mutex_unlock(&card->fw.lock);
540 return 0;
541 failed:
542 card->fw.up = 0;
543 if (card->pdat->enable_irq)
544 card->pdat->enable_irq(card->pdev, 0);
545 softing_set_reset_dpram(card);
546 if (card->pdat->reset)
547 card->pdat->reset(card->pdev, 1);
548 mutex_unlock(&card->fw.lock);
549 return ret;
550 }
551
552 /*
553 * netdev sysfs
554 */
555 static ssize_t show_chip(struct device *dev, struct device_attribute *attr,
556 char *buf)
557 {
558 struct net_device *ndev = to_net_dev(dev);
559 struct softing_priv *priv = netdev2softing(ndev);
560
561 return sprintf(buf, "%i\n", priv->chip);
562 }
563
564 static ssize_t show_output(struct device *dev, struct device_attribute *attr,
565 char *buf)
566 {
567 struct net_device *ndev = to_net_dev(dev);
568 struct softing_priv *priv = netdev2softing(ndev);
569
570 return sprintf(buf, "0x%02x\n", priv->output);
571 }
572
573 static ssize_t store_output(struct device *dev, struct device_attribute *attr,
574 const char *buf, size_t count)
575 {
576 struct net_device *ndev = to_net_dev(dev);
577 struct softing_priv *priv = netdev2softing(ndev);
578 struct softing *card = priv->card;
579 unsigned long val;
580 int ret;
581
582 ret = kstrtoul(buf, 0, &val);
583 if (ret < 0)
584 return ret;
585 val &= 0xFF;
586
587 ret = mutex_lock_interruptible(&card->fw.lock);
588 if (ret)
589 return -ERESTARTSYS;
590 if (netif_running(ndev)) {
591 mutex_unlock(&card->fw.lock);
592 return -EBUSY;
593 }
594 priv->output = val;
595 mutex_unlock(&card->fw.lock);
596 return count;
597 }
598
599 static const DEVICE_ATTR(chip, 0444, show_chip, NULL);
600 static const DEVICE_ATTR(output, 0644, show_output, store_output);
601
602 static const struct attribute *const netdev_sysfs_attrs[] = {
603 &dev_attr_chip.attr,
604 &dev_attr_output.attr,
605 NULL,
606 };
607 static const struct attribute_group netdev_sysfs_group = {
608 .name = NULL,
609 .attrs = (struct attribute **)netdev_sysfs_attrs,
610 };
611
612 static const struct net_device_ops softing_netdev_ops = {
613 .ndo_open = softing_netdev_open,
614 .ndo_stop = softing_netdev_stop,
615 .ndo_start_xmit = softing_netdev_start_xmit,
616 .ndo_change_mtu = can_change_mtu,
617 };
618
619 static const struct can_bittiming_const softing_btr_const = {
620 .name = "softing",
621 .tseg1_min = 1,
622 .tseg1_max = 16,
623 .tseg2_min = 1,
624 .tseg2_max = 8,
625 .sjw_max = 4, /* overruled */
626 .brp_min = 1,
627 .brp_max = 32, /* overruled */
628 .brp_inc = 1,
629 };
630
631
632 static struct net_device *softing_netdev_create(struct softing *card,
633 uint16_t chip_id)
634 {
635 struct net_device *netdev;
636 struct softing_priv *priv;
637
638 netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX);
639 if (!netdev) {
640 dev_alert(&card->pdev->dev, "alloc_candev failed\n");
641 return NULL;
642 }
643 priv = netdev_priv(netdev);
644 priv->netdev = netdev;
645 priv->card = card;
646 memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const));
647 priv->btr_const.brp_max = card->pdat->max_brp;
648 priv->btr_const.sjw_max = card->pdat->max_sjw;
649 priv->can.bittiming_const = &priv->btr_const;
650 priv->can.clock.freq = 8000000;
651 priv->chip = chip_id;
652 priv->output = softing_default_output(netdev);
653 SET_NETDEV_DEV(netdev, &card->pdev->dev);
654
655 netdev->flags |= IFF_ECHO;
656 netdev->netdev_ops = &softing_netdev_ops;
657 priv->can.do_set_mode = softing_candev_set_mode;
658 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
659
660 return netdev;
661 }
662
663 static int softing_netdev_register(struct net_device *netdev)
664 {
665 int ret;
666
667 ret = register_candev(netdev);
668 if (ret) {
669 dev_alert(&netdev->dev, "register failed\n");
670 return ret;
671 }
672 if (sysfs_create_group(&netdev->dev.kobj, &netdev_sysfs_group) < 0)
673 netdev_alert(netdev, "sysfs group failed\n");
674
675 return 0;
676 }
677
678 static void softing_netdev_cleanup(struct net_device *netdev)
679 {
680 sysfs_remove_group(&netdev->dev.kobj, &netdev_sysfs_group);
681 unregister_candev(netdev);
682 free_candev(netdev);
683 }
684
685 /*
686 * sysfs for Platform device
687 */
688 #define DEV_ATTR_RO(name, member) \
689 static ssize_t show_##name(struct device *dev, \
690 struct device_attribute *attr, char *buf) \
691 { \
692 struct softing *card = dev_get_drvdata(dev); \
693 return sprintf(buf, "%u\n", card->member); \
694 } \
695 static DEVICE_ATTR(name, 0444, show_##name, NULL)
696
697 #define DEV_ATTR_RO_STR(name, member) \
698 static ssize_t show_##name(struct device *dev, \
699 struct device_attribute *attr, char *buf) \
700 { \
701 struct softing *card = dev_get_drvdata(dev); \
702 return sprintf(buf, "%s\n", card->member); \
703 } \
704 static DEVICE_ATTR(name, 0444, show_##name, NULL)
705
706 DEV_ATTR_RO(serial, id.serial);
707 DEV_ATTR_RO_STR(firmware, pdat->app.fw);
708 DEV_ATTR_RO(firmware_version, id.fw_version);
709 DEV_ATTR_RO_STR(hardware, pdat->name);
710 DEV_ATTR_RO(hardware_version, id.hw_version);
711 DEV_ATTR_RO(license, id.license);
712
713 static struct attribute *softing_pdev_attrs[] = {
714 &dev_attr_serial.attr,
715 &dev_attr_firmware.attr,
716 &dev_attr_firmware_version.attr,
717 &dev_attr_hardware.attr,
718 &dev_attr_hardware_version.attr,
719 &dev_attr_license.attr,
720 NULL,
721 };
722
723 static const struct attribute_group softing_pdev_group = {
724 .name = NULL,
725 .attrs = softing_pdev_attrs,
726 };
727
728 /*
729 * platform driver
730 */
731 static int softing_pdev_remove(struct platform_device *pdev)
732 {
733 struct softing *card = platform_get_drvdata(pdev);
734 int j;
735
736 /* first, disable card*/
737 softing_card_shutdown(card);
738
739 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
740 if (!card->net[j])
741 continue;
742 softing_netdev_cleanup(card->net[j]);
743 card->net[j] = NULL;
744 }
745 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
746
747 iounmap(card->dpram);
748 kfree(card);
749 return 0;
750 }
751
752 static int softing_pdev_probe(struct platform_device *pdev)
753 {
754 const struct softing_platform_data *pdat = dev_get_platdata(&pdev->dev);
755 struct softing *card;
756 struct net_device *netdev;
757 struct softing_priv *priv;
758 struct resource *pres;
759 int ret;
760 int j;
761
762 if (!pdat) {
763 dev_warn(&pdev->dev, "no platform data\n");
764 return -EINVAL;
765 }
766 if (pdat->nbus > ARRAY_SIZE(card->net)) {
767 dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus);
768 return -EINVAL;
769 }
770
771 card = kzalloc(sizeof(*card), GFP_KERNEL);
772 if (!card)
773 return -ENOMEM;
774 card->pdat = pdat;
775 card->pdev = pdev;
776 platform_set_drvdata(pdev, card);
777 mutex_init(&card->fw.lock);
778 spin_lock_init(&card->spin);
779
780 ret = -EINVAL;
781 pres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
782 if (!pres)
783 goto platform_resource_failed;
784 card->dpram_phys = pres->start;
785 card->dpram_size = resource_size(pres);
786 card->dpram = ioremap(card->dpram_phys, card->dpram_size);
787 if (!card->dpram) {
788 dev_alert(&card->pdev->dev, "dpram ioremap failed\n");
789 goto ioremap_failed;
790 }
791
792 pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
793 if (pres)
794 card->irq.nr = pres->start;
795
796 /* reset card */
797 ret = softing_card_boot(card);
798 if (ret < 0) {
799 dev_alert(&pdev->dev, "failed to boot\n");
800 goto boot_failed;
801 }
802
803 /* only now, the chip's are known */
804 card->id.freq = card->pdat->freq;
805
806 ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group);
807 if (ret < 0) {
808 dev_alert(&card->pdev->dev, "sysfs failed\n");
809 goto sysfs_failed;
810 }
811
812 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
813 card->net[j] = netdev =
814 softing_netdev_create(card, card->id.chip[j]);
815 if (!netdev) {
816 dev_alert(&pdev->dev, "failed to make can[%i]", j);
817 ret = -ENOMEM;
818 goto netdev_failed;
819 }
820 netdev->dev_id = j;
821 priv = netdev_priv(card->net[j]);
822 priv->index = j;
823 ret = softing_netdev_register(netdev);
824 if (ret) {
825 free_candev(netdev);
826 card->net[j] = NULL;
827 dev_alert(&card->pdev->dev,
828 "failed to register can[%i]\n", j);
829 goto netdev_failed;
830 }
831 }
832 dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name);
833 return 0;
834
835 netdev_failed:
836 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
837 if (!card->net[j])
838 continue;
839 softing_netdev_cleanup(card->net[j]);
840 }
841 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
842 sysfs_failed:
843 softing_card_shutdown(card);
844 boot_failed:
845 iounmap(card->dpram);
846 ioremap_failed:
847 platform_resource_failed:
848 kfree(card);
849 return ret;
850 }
851
852 static struct platform_driver softing_driver = {
853 .driver = {
854 .name = "softing",
855 },
856 .probe = softing_pdev_probe,
857 .remove = softing_pdev_remove,
858 };
859
860 module_platform_driver(softing_driver);
861
862 MODULE_ALIAS("platform:softing");
863 MODULE_DESCRIPTION("Softing DPRAM CAN driver");
864 MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>");
865 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support