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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/ethtool.h>
9#include <linux/module.h>
10#include <linux/interrupt.h>
11#include <asm/io.h>
12
13#include "softing.h"
14
15#define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1)
16
17/*
18 * test is a specific CAN netdev
19 * is online (ie. up 'n running, not sleeping, not busoff
20 */
21static inline int canif_is_active(struct net_device *netdev)
22{
23 struct can_priv *can = netdev_priv(netdev);
24
25 if (!netif_running(netdev))
26 return 0;
27 return (can->state <= CAN_STATE_ERROR_PASSIVE);
28}
29
30/* reset DPRAM */
31static inline void softing_set_reset_dpram(struct softing *card)
32{
33 if (card->pdat->generation >= 2) {
34 spin_lock_bh(&card->spin);
35 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1,
36 &card->dpram[DPRAM_V2_RESET]);
37 spin_unlock_bh(&card->spin);
38 }
39}
40
41static inline void softing_clr_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
51/* trigger the tx queue-ing */
52static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb,
53 struct net_device *dev)
54{
55 struct softing_priv *priv = netdev_priv(dev);
56 struct softing *card = priv->card;
57 int ret;
58 uint8_t *ptr;
59 uint8_t fifo_wr, fifo_rd;
60 struct can_frame *cf = (struct can_frame *)skb->data;
61 uint8_t buf[DPRAM_TX_SIZE];
62
63 if (can_dev_dropped_skb(dev, skb))
64 return NETDEV_TX_OK;
65
66 spin_lock(&card->spin);
67
68 ret = NETDEV_TX_BUSY;
69 if (!card->fw.up ||
70 (card->tx.pending >= TXMAX) ||
71 (priv->tx.pending >= TX_ECHO_SKB_MAX))
72 goto xmit_done;
73 fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]);
74 fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]);
75 if (fifo_wr == fifo_rd)
76 /* fifo full */
77 goto xmit_done;
78 memset(buf, 0, sizeof(buf));
79 ptr = buf;
80 *ptr = CMD_TX;
81 if (cf->can_id & CAN_RTR_FLAG)
82 *ptr |= CMD_RTR;
83 if (cf->can_id & CAN_EFF_FLAG)
84 *ptr |= CMD_XTD;
85 if (priv->index)
86 *ptr |= CMD_BUS2;
87 ++ptr;
88 *ptr++ = cf->len;
89 *ptr++ = (cf->can_id >> 0);
90 *ptr++ = (cf->can_id >> 8);
91 if (cf->can_id & CAN_EFF_FLAG) {
92 *ptr++ = (cf->can_id >> 16);
93 *ptr++ = (cf->can_id >> 24);
94 } else {
95 /* increment 1, not 2 as you might think */
96 ptr += 1;
97 }
98 if (!(cf->can_id & CAN_RTR_FLAG))
99 memcpy(ptr, &cf->data[0], cf->len);
100 memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr],
101 buf, DPRAM_TX_SIZE);
102 if (++fifo_wr >= DPRAM_TX_CNT)
103 fifo_wr = 0;
104 iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]);
105 card->tx.last_bus = priv->index;
106 ++card->tx.pending;
107 ++priv->tx.pending;
108 can_put_echo_skb(skb, dev, priv->tx.echo_put, 0);
109 ++priv->tx.echo_put;
110 if (priv->tx.echo_put >= TX_ECHO_SKB_MAX)
111 priv->tx.echo_put = 0;
112 /* can_put_echo_skb() saves the skb, safe to return TX_OK */
113 ret = NETDEV_TX_OK;
114xmit_done:
115 spin_unlock(&card->spin);
116 if (card->tx.pending >= TXMAX) {
117 int j;
118 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
119 if (card->net[j])
120 netif_stop_queue(card->net[j]);
121 }
122 }
123 if (ret != NETDEV_TX_OK)
124 netif_stop_queue(dev);
125
126 return ret;
127}
128
129/*
130 * shortcut for skb delivery
131 */
132int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg,
133 ktime_t ktime)
134{
135 struct sk_buff *skb;
136 struct can_frame *cf;
137
138 skb = alloc_can_skb(netdev, &cf);
139 if (!skb)
140 return -ENOMEM;
141 memcpy(cf, msg, sizeof(*msg));
142 skb->tstamp = ktime;
143 return netif_rx(skb);
144}
145
146/*
147 * softing_handle_1
148 * pop 1 entry from the DPRAM queue, and process
149 */
150static int softing_handle_1(struct softing *card)
151{
152 struct net_device *netdev;
153 struct softing_priv *priv;
154 ktime_t ktime;
155 struct can_frame msg;
156 int cnt = 0, lost_msg;
157 uint8_t fifo_rd, fifo_wr, cmd;
158 uint8_t *ptr;
159 uint32_t tmp_u32;
160 uint8_t buf[DPRAM_RX_SIZE];
161
162 memset(&msg, 0, sizeof(msg));
163 /* test for lost msgs */
164 lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]);
165 if (lost_msg) {
166 int j;
167 /* reset condition */
168 iowrite8(0, &card->dpram[DPRAM_RX_LOST]);
169 /* prepare msg */
170 msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL;
171 msg.len = CAN_ERR_DLC;
172 msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
173 /*
174 * service to all buses, we don't know which it was applicable
175 * but only service buses that are online
176 */
177 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
178 netdev = card->net[j];
179 if (!netdev)
180 continue;
181 if (!canif_is_active(netdev))
182 /* a dead bus has no overflows */
183 continue;
184 ++netdev->stats.rx_over_errors;
185 softing_netdev_rx(netdev, &msg, 0);
186 }
187 /* prepare for other use */
188 memset(&msg, 0, sizeof(msg));
189 ++cnt;
190 }
191
192 fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]);
193 fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]);
194
195 if (++fifo_rd >= DPRAM_RX_CNT)
196 fifo_rd = 0;
197 if (fifo_wr == fifo_rd)
198 return cnt;
199
200 memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd],
201 DPRAM_RX_SIZE);
202 mb();
203 /* trigger dual port RAM */
204 iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]);
205
206 ptr = buf;
207 cmd = *ptr++;
208 if (cmd == 0xff)
209 /* not quite useful, probably the card has got out */
210 return 0;
211 netdev = card->net[0];
212 if (cmd & CMD_BUS2)
213 netdev = card->net[1];
214 priv = netdev_priv(netdev);
215
216 if (cmd & CMD_ERR) {
217 uint8_t can_state, state;
218
219 state = *ptr++;
220
221 msg.can_id = CAN_ERR_FLAG;
222 msg.len = CAN_ERR_DLC;
223
224 if (state & SF_MASK_BUSOFF) {
225 can_state = CAN_STATE_BUS_OFF;
226 msg.can_id |= CAN_ERR_BUSOFF;
227 state = STATE_BUSOFF;
228 } else if (state & SF_MASK_EPASSIVE) {
229 can_state = CAN_STATE_ERROR_PASSIVE;
230 msg.can_id |= CAN_ERR_CRTL;
231 msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE;
232 state = STATE_EPASSIVE;
233 } else {
234 can_state = CAN_STATE_ERROR_ACTIVE;
235 msg.can_id |= CAN_ERR_CRTL;
236 state = STATE_EACTIVE;
237 }
238 /* update DPRAM */
239 iowrite8(state, &card->dpram[priv->index ?
240 DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]);
241 /* timestamp */
242 tmp_u32 = le32_to_cpup((void *)ptr);
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 /* update socket */
280 if (cmd & CMD_ACK) {
281 /* acknowledge, was tx msg */
282 struct sk_buff *skb;
283 skb = priv->can.echo_skb[priv->tx.echo_get];
284 if (skb)
285 skb->tstamp = ktime;
286 ++netdev->stats.tx_packets;
287 netdev->stats.tx_bytes +=
288 can_get_echo_skb(netdev, priv->tx.echo_get,
289 NULL);
290 ++priv->tx.echo_get;
291 if (priv->tx.echo_get >= TX_ECHO_SKB_MAX)
292 priv->tx.echo_get = 0;
293 if (priv->tx.pending)
294 --priv->tx.pending;
295 if (card->tx.pending)
296 --card->tx.pending;
297 } else {
298 int ret;
299
300 ret = softing_netdev_rx(netdev, &msg, ktime);
301 if (ret == NET_RX_SUCCESS) {
302 ++netdev->stats.rx_packets;
303 if (!(msg.can_id & CAN_RTR_FLAG))
304 netdev->stats.rx_bytes += msg.len;
305 } else {
306 ++netdev->stats.rx_dropped;
307 }
308 }
309 }
310 ++cnt;
311 return cnt;
312}
313
314/*
315 * real interrupt handler
316 */
317static irqreturn_t softing_irq_thread(int irq, void *dev_id)
318{
319 struct softing *card = (struct softing *)dev_id;
320 struct net_device *netdev;
321 struct softing_priv *priv;
322 int j, offset, work_done;
323
324 work_done = 0;
325 spin_lock_bh(&card->spin);
326 while (softing_handle_1(card) > 0) {
327 ++card->irq.svc_count;
328 ++work_done;
329 }
330 spin_unlock_bh(&card->spin);
331 /* resume tx queue's */
332 offset = card->tx.last_bus;
333 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
334 if (card->tx.pending >= TXMAX)
335 break;
336 netdev = card->net[(j + offset + 1) % card->pdat->nbus];
337 if (!netdev)
338 continue;
339 priv = netdev_priv(netdev);
340 if (!canif_is_active(netdev))
341 /* it makes no sense to wake dead buses */
342 continue;
343 if (priv->tx.pending >= TX_ECHO_SKB_MAX)
344 continue;
345 ++work_done;
346 netif_wake_queue(netdev);
347 }
348 return work_done ? IRQ_HANDLED : IRQ_NONE;
349}
350
351/*
352 * interrupt routines:
353 * schedule the 'real interrupt handler'
354 */
355static irqreturn_t softing_irq_v2(int irq, void *dev_id)
356{
357 struct softing *card = (struct softing *)dev_id;
358 uint8_t ir;
359
360 ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]);
361 iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]);
362 return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE;
363}
364
365static irqreturn_t softing_irq_v1(int irq, void *dev_id)
366{
367 struct softing *card = (struct softing *)dev_id;
368 uint8_t ir;
369
370 ir = ioread8(&card->dpram[DPRAM_IRQ_TOHOST]);
371 iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]);
372 return ir ? IRQ_WAKE_THREAD : IRQ_NONE;
373}
374
375/*
376 * netdev/candev interoperability
377 */
378static int softing_netdev_open(struct net_device *ndev)
379{
380 int ret;
381
382 /* check or determine and set bittime */
383 ret = open_candev(ndev);
384 if (ret)
385 return ret;
386
387 ret = softing_startstop(ndev, 1);
388 if (ret < 0)
389 close_candev(ndev);
390
391 return ret;
392}
393
394static int softing_netdev_stop(struct net_device *ndev)
395{
396 netif_stop_queue(ndev);
397
398 /* softing cycle does close_candev() */
399 return softing_startstop(ndev, 0);
400}
401
402static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode)
403{
404 int ret;
405
406 switch (mode) {
407 case CAN_MODE_START:
408 /* softing_startstop does close_candev() */
409 ret = softing_startstop(ndev, 1);
410 return ret;
411 case CAN_MODE_STOP:
412 case CAN_MODE_SLEEP:
413 return -EOPNOTSUPP;
414 }
415 return 0;
416}
417
418/*
419 * Softing device management helpers
420 */
421int softing_enable_irq(struct softing *card, int enable)
422{
423 int ret;
424
425 if (!card->irq.nr) {
426 return 0;
427 } else if (card->irq.requested && !enable) {
428 free_irq(card->irq.nr, card);
429 card->irq.requested = 0;
430 } else if (!card->irq.requested && enable) {
431 ret = request_threaded_irq(card->irq.nr,
432 (card->pdat->generation >= 2) ?
433 softing_irq_v2 : softing_irq_v1,
434 softing_irq_thread, IRQF_SHARED,
435 dev_name(&card->pdev->dev), card);
436 if (ret) {
437 dev_alert(&card->pdev->dev,
438 "request_threaded_irq(%u) failed\n",
439 card->irq.nr);
440 return ret;
441 }
442 card->irq.requested = 1;
443 }
444 return 0;
445}
446
447static void softing_card_shutdown(struct softing *card)
448{
449 int fw_up = 0;
450
451 if (mutex_lock_interruptible(&card->fw.lock)) {
452 /* return -ERESTARTSYS */;
453 }
454 fw_up = card->fw.up;
455 card->fw.up = 0;
456
457 if (card->irq.requested && card->irq.nr) {
458 free_irq(card->irq.nr, card);
459 card->irq.requested = 0;
460 }
461 if (fw_up) {
462 if (card->pdat->enable_irq)
463 card->pdat->enable_irq(card->pdev, 0);
464 softing_set_reset_dpram(card);
465 if (card->pdat->reset)
466 card->pdat->reset(card->pdev, 1);
467 }
468 mutex_unlock(&card->fw.lock);
469}
470
471static int softing_card_boot(struct softing *card)
472{
473 int ret, j;
474 static const uint8_t stream[] = {
475 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, };
476 unsigned char back[sizeof(stream)];
477
478 if (mutex_lock_interruptible(&card->fw.lock))
479 return -ERESTARTSYS;
480 if (card->fw.up) {
481 mutex_unlock(&card->fw.lock);
482 return 0;
483 }
484 /* reset board */
485 if (card->pdat->enable_irq)
486 card->pdat->enable_irq(card->pdev, 1);
487 /* boot card */
488 softing_set_reset_dpram(card);
489 if (card->pdat->reset)
490 card->pdat->reset(card->pdev, 1);
491 for (j = 0; (j + sizeof(stream)) < card->dpram_size;
492 j += sizeof(stream)) {
493
494 memcpy_toio(&card->dpram[j], stream, sizeof(stream));
495 /* flush IO cache */
496 mb();
497 memcpy_fromio(back, &card->dpram[j], sizeof(stream));
498
499 if (!memcmp(back, stream, sizeof(stream)))
500 continue;
501 /* memory is not equal */
502 dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j);
503 ret = -EIO;
504 goto failed;
505 }
506 wmb();
507 /* load boot firmware */
508 ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram,
509 card->dpram_size,
510 card->pdat->boot.offs - card->pdat->boot.addr);
511 if (ret < 0)
512 goto failed;
513 /* load loader firmware */
514 ret = softing_load_fw(card->pdat->load.fw, card, card->dpram,
515 card->dpram_size,
516 card->pdat->load.offs - card->pdat->load.addr);
517 if (ret < 0)
518 goto failed;
519
520 if (card->pdat->reset)
521 card->pdat->reset(card->pdev, 0);
522 softing_clr_reset_dpram(card);
523 ret = softing_bootloader_command(card, 0, "card boot");
524 if (ret < 0)
525 goto failed;
526 ret = softing_load_app_fw(card->pdat->app.fw, card);
527 if (ret < 0)
528 goto failed;
529
530 ret = softing_chip_poweron(card);
531 if (ret < 0)
532 goto failed;
533
534 card->fw.up = 1;
535 mutex_unlock(&card->fw.lock);
536 return 0;
537failed:
538 card->fw.up = 0;
539 if (card->pdat->enable_irq)
540 card->pdat->enable_irq(card->pdev, 0);
541 softing_set_reset_dpram(card);
542 if (card->pdat->reset)
543 card->pdat->reset(card->pdev, 1);
544 mutex_unlock(&card->fw.lock);
545 return ret;
546}
547
548/*
549 * netdev sysfs
550 */
551static ssize_t show_chip(struct device *dev, struct device_attribute *attr,
552 char *buf)
553{
554 struct net_device *ndev = to_net_dev(dev);
555 struct softing_priv *priv = netdev2softing(ndev);
556
557 return sprintf(buf, "%i\n", priv->chip);
558}
559
560static ssize_t show_output(struct device *dev, struct device_attribute *attr,
561 char *buf)
562{
563 struct net_device *ndev = to_net_dev(dev);
564 struct softing_priv *priv = netdev2softing(ndev);
565
566 return sprintf(buf, "0x%02x\n", priv->output);
567}
568
569static ssize_t store_output(struct device *dev, struct device_attribute *attr,
570 const char *buf, size_t count)
571{
572 struct net_device *ndev = to_net_dev(dev);
573 struct softing_priv *priv = netdev2softing(ndev);
574 struct softing *card = priv->card;
575 unsigned long val;
576 int ret;
577
578 ret = kstrtoul(buf, 0, &val);
579 if (ret < 0)
580 return ret;
581 val &= 0xFF;
582
583 ret = mutex_lock_interruptible(&card->fw.lock);
584 if (ret)
585 return -ERESTARTSYS;
586 if (netif_running(ndev)) {
587 mutex_unlock(&card->fw.lock);
588 return -EBUSY;
589 }
590 priv->output = val;
591 mutex_unlock(&card->fw.lock);
592 return count;
593}
594
595static const DEVICE_ATTR(chip, 0444, show_chip, NULL);
596static const DEVICE_ATTR(output, 0644, show_output, store_output);
597
598static const struct attribute *const netdev_sysfs_attrs[] = {
599 &dev_attr_chip.attr,
600 &dev_attr_output.attr,
601 NULL,
602};
603static const struct attribute_group netdev_sysfs_group = {
604 .name = NULL,
605 .attrs = (struct attribute **)netdev_sysfs_attrs,
606};
607
608static const struct net_device_ops softing_netdev_ops = {
609 .ndo_open = softing_netdev_open,
610 .ndo_stop = softing_netdev_stop,
611 .ndo_start_xmit = softing_netdev_start_xmit,
612 .ndo_change_mtu = can_change_mtu,
613};
614
615static const struct ethtool_ops softing_ethtool_ops = {
616 .get_ts_info = ethtool_op_get_ts_info,
617};
618
619static const struct can_bittiming_const softing_btr_const = {
620 .name = KBUILD_MODNAME,
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
632static 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 netdev->ethtool_ops = &softing_ethtool_ops;
658 priv->can.do_set_mode = softing_candev_set_mode;
659 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
660
661 return netdev;
662}
663
664static int softing_netdev_register(struct net_device *netdev)
665{
666 int ret;
667
668 ret = register_candev(netdev);
669 if (ret) {
670 dev_alert(&netdev->dev, "register failed\n");
671 return ret;
672 }
673 if (sysfs_create_group(&netdev->dev.kobj, &netdev_sysfs_group) < 0)
674 netdev_alert(netdev, "sysfs group failed\n");
675
676 return 0;
677}
678
679static void softing_netdev_cleanup(struct net_device *netdev)
680{
681 sysfs_remove_group(&netdev->dev.kobj, &netdev_sysfs_group);
682 unregister_candev(netdev);
683 free_candev(netdev);
684}
685
686/*
687 * sysfs for Platform device
688 */
689#define DEV_ATTR_RO(name, member) \
690static ssize_t show_##name(struct device *dev, \
691 struct device_attribute *attr, char *buf) \
692{ \
693 struct softing *card = dev_get_drvdata(dev); \
694 return sprintf(buf, "%u\n", card->member); \
695} \
696static DEVICE_ATTR(name, 0444, show_##name, NULL)
697
698#define DEV_ATTR_RO_STR(name, member) \
699static ssize_t show_##name(struct device *dev, \
700 struct device_attribute *attr, char *buf) \
701{ \
702 struct softing *card = dev_get_drvdata(dev); \
703 return sprintf(buf, "%s\n", card->member); \
704} \
705static DEVICE_ATTR(name, 0444, show_##name, NULL)
706
707DEV_ATTR_RO(serial, id.serial);
708DEV_ATTR_RO_STR(firmware, pdat->app.fw);
709DEV_ATTR_RO(firmware_version, id.fw_version);
710DEV_ATTR_RO_STR(hardware, pdat->name);
711DEV_ATTR_RO(hardware_version, id.hw_version);
712DEV_ATTR_RO(license, id.license);
713
714static struct attribute *softing_pdev_attrs[] = {
715 &dev_attr_serial.attr,
716 &dev_attr_firmware.attr,
717 &dev_attr_firmware_version.attr,
718 &dev_attr_hardware.attr,
719 &dev_attr_hardware_version.attr,
720 &dev_attr_license.attr,
721 NULL,
722};
723
724static const struct attribute_group softing_pdev_group = {
725 .name = NULL,
726 .attrs = softing_pdev_attrs,
727};
728
729/*
730 * platform driver
731 */
732static void softing_pdev_remove(struct platform_device *pdev)
733{
734 struct softing *card = platform_get_drvdata(pdev);
735 int j;
736
737 /* first, disable card*/
738 softing_card_shutdown(card);
739
740 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
741 if (!card->net[j])
742 continue;
743 softing_netdev_cleanup(card->net[j]);
744 card->net[j] = NULL;
745 }
746 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
747
748 iounmap(card->dpram);
749 kfree(card);
750}
751
752static 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
835netdev_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);
842sysfs_failed:
843 softing_card_shutdown(card);
844boot_failed:
845 iounmap(card->dpram);
846ioremap_failed:
847platform_resource_failed:
848 kfree(card);
849 return ret;
850}
851
852static struct platform_driver softing_driver = {
853 .driver = {
854 .name = KBUILD_MODNAME,
855 },
856 .probe = softing_pdev_probe,
857 .remove = softing_pdev_remove,
858};
859
860module_platform_driver(softing_driver);
861
862MODULE_ALIAS("platform:softing");
863MODULE_DESCRIPTION("Softing DPRAM CAN driver");
864MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>");
865MODULE_LICENSE("GPL v2");
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 */
20static 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 */
30static 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
40static 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 */
51static 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->can_dlc;
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->can_dlc);
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;
113xmit_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 */
131int 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 */
149static 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.can_dlc = CAN_ERR_DLC;
171 msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
172 /*
173 * service to all busses, we don't know which it was applicable
174 * but only service busses 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.can_dlc = 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.can_dlc = get_can_dlc(*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.can_dlc;
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.can_dlc;
306 } else {
307 ++netdev->stats.rx_dropped;
308 }
309 }
310 }
311 ++cnt;
312 return cnt;
313}
314
315/*
316 * real interrupt handler
317 */
318static 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 busses */
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 */
356static 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
366static 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 inter-operability
378 */
379static 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 ret = softing_startstop(ndev, 1);
387 return ret;
388}
389
390static int softing_netdev_stop(struct net_device *ndev)
391{
392 int ret;
393
394 netif_stop_queue(ndev);
395
396 /* softing cycle does close_candev() */
397 ret = softing_startstop(ndev, 0);
398 return ret;
399}
400
401static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode)
402{
403 int ret;
404
405 switch (mode) {
406 case CAN_MODE_START:
407 /* softing_startstop does close_candev() */
408 ret = softing_startstop(ndev, 1);
409 return ret;
410 case CAN_MODE_STOP:
411 case CAN_MODE_SLEEP:
412 return -EOPNOTSUPP;
413 }
414 return 0;
415}
416
417/*
418 * Softing device management helpers
419 */
420int softing_enable_irq(struct softing *card, int enable)
421{
422 int ret;
423
424 if (!card->irq.nr) {
425 return 0;
426 } else if (card->irq.requested && !enable) {
427 free_irq(card->irq.nr, card);
428 card->irq.requested = 0;
429 } else if (!card->irq.requested && enable) {
430 ret = request_threaded_irq(card->irq.nr,
431 (card->pdat->generation >= 2) ?
432 softing_irq_v2 : softing_irq_v1,
433 softing_irq_thread, IRQF_SHARED,
434 dev_name(&card->pdev->dev), card);
435 if (ret) {
436 dev_alert(&card->pdev->dev,
437 "request_threaded_irq(%u) failed\n",
438 card->irq.nr);
439 return ret;
440 }
441 card->irq.requested = 1;
442 }
443 return 0;
444}
445
446static void softing_card_shutdown(struct softing *card)
447{
448 int fw_up = 0;
449
450 if (mutex_lock_interruptible(&card->fw.lock))
451 /* return -ERESTARTSYS */;
452 fw_up = card->fw.up;
453 card->fw.up = 0;
454
455 if (card->irq.requested && card->irq.nr) {
456 free_irq(card->irq.nr, card);
457 card->irq.requested = 0;
458 }
459 if (fw_up) {
460 if (card->pdat->enable_irq)
461 card->pdat->enable_irq(card->pdev, 0);
462 softing_set_reset_dpram(card);
463 if (card->pdat->reset)
464 card->pdat->reset(card->pdev, 1);
465 }
466 mutex_unlock(&card->fw.lock);
467}
468
469static int softing_card_boot(struct softing *card)
470{
471 int ret, j;
472 static const uint8_t stream[] = {
473 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, };
474 unsigned char back[sizeof(stream)];
475
476 if (mutex_lock_interruptible(&card->fw.lock))
477 return -ERESTARTSYS;
478 if (card->fw.up) {
479 mutex_unlock(&card->fw.lock);
480 return 0;
481 }
482 /* reset board */
483 if (card->pdat->enable_irq)
484 card->pdat->enable_irq(card->pdev, 1);
485 /* boot card */
486 softing_set_reset_dpram(card);
487 if (card->pdat->reset)
488 card->pdat->reset(card->pdev, 1);
489 for (j = 0; (j + sizeof(stream)) < card->dpram_size;
490 j += sizeof(stream)) {
491
492 memcpy_toio(&card->dpram[j], stream, sizeof(stream));
493 /* flush IO cache */
494 mb();
495 memcpy_fromio(back, &card->dpram[j], sizeof(stream));
496
497 if (!memcmp(back, stream, sizeof(stream)))
498 continue;
499 /* memory is not equal */
500 dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j);
501 ret = -EIO;
502 goto failed;
503 }
504 wmb();
505 /* load boot firmware */
506 ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram,
507 card->dpram_size,
508 card->pdat->boot.offs - card->pdat->boot.addr);
509 if (ret < 0)
510 goto failed;
511 /* load loader firmware */
512 ret = softing_load_fw(card->pdat->load.fw, card, card->dpram,
513 card->dpram_size,
514 card->pdat->load.offs - card->pdat->load.addr);
515 if (ret < 0)
516 goto failed;
517
518 if (card->pdat->reset)
519 card->pdat->reset(card->pdev, 0);
520 softing_clr_reset_dpram(card);
521 ret = softing_bootloader_command(card, 0, "card boot");
522 if (ret < 0)
523 goto failed;
524 ret = softing_load_app_fw(card->pdat->app.fw, card);
525 if (ret < 0)
526 goto failed;
527
528 ret = softing_chip_poweron(card);
529 if (ret < 0)
530 goto failed;
531
532 card->fw.up = 1;
533 mutex_unlock(&card->fw.lock);
534 return 0;
535failed:
536 card->fw.up = 0;
537 if (card->pdat->enable_irq)
538 card->pdat->enable_irq(card->pdev, 0);
539 softing_set_reset_dpram(card);
540 if (card->pdat->reset)
541 card->pdat->reset(card->pdev, 1);
542 mutex_unlock(&card->fw.lock);
543 return ret;
544}
545
546/*
547 * netdev sysfs
548 */
549static ssize_t show_chip(struct device *dev, struct device_attribute *attr,
550 char *buf)
551{
552 struct net_device *ndev = to_net_dev(dev);
553 struct softing_priv *priv = netdev2softing(ndev);
554
555 return sprintf(buf, "%i\n", priv->chip);
556}
557
558static ssize_t show_output(struct device *dev, struct device_attribute *attr,
559 char *buf)
560{
561 struct net_device *ndev = to_net_dev(dev);
562 struct softing_priv *priv = netdev2softing(ndev);
563
564 return sprintf(buf, "0x%02x\n", priv->output);
565}
566
567static ssize_t store_output(struct device *dev, struct device_attribute *attr,
568 const char *buf, size_t count)
569{
570 struct net_device *ndev = to_net_dev(dev);
571 struct softing_priv *priv = netdev2softing(ndev);
572 struct softing *card = priv->card;
573 unsigned long val;
574 int ret;
575
576 ret = kstrtoul(buf, 0, &val);
577 if (ret < 0)
578 return ret;
579 val &= 0xFF;
580
581 ret = mutex_lock_interruptible(&card->fw.lock);
582 if (ret)
583 return -ERESTARTSYS;
584 if (netif_running(ndev)) {
585 mutex_unlock(&card->fw.lock);
586 return -EBUSY;
587 }
588 priv->output = val;
589 mutex_unlock(&card->fw.lock);
590 return count;
591}
592
593static const DEVICE_ATTR(chip, 0444, show_chip, NULL);
594static const DEVICE_ATTR(output, 0644, show_output, store_output);
595
596static const struct attribute *const netdev_sysfs_attrs[] = {
597 &dev_attr_chip.attr,
598 &dev_attr_output.attr,
599 NULL,
600};
601static const struct attribute_group netdev_sysfs_group = {
602 .name = NULL,
603 .attrs = (struct attribute **)netdev_sysfs_attrs,
604};
605
606static const struct net_device_ops softing_netdev_ops = {
607 .ndo_open = softing_netdev_open,
608 .ndo_stop = softing_netdev_stop,
609 .ndo_start_xmit = softing_netdev_start_xmit,
610 .ndo_change_mtu = can_change_mtu,
611};
612
613static const struct can_bittiming_const softing_btr_const = {
614 .name = "softing",
615 .tseg1_min = 1,
616 .tseg1_max = 16,
617 .tseg2_min = 1,
618 .tseg2_max = 8,
619 .sjw_max = 4, /* overruled */
620 .brp_min = 1,
621 .brp_max = 32, /* overruled */
622 .brp_inc = 1,
623};
624
625
626static struct net_device *softing_netdev_create(struct softing *card,
627 uint16_t chip_id)
628{
629 struct net_device *netdev;
630 struct softing_priv *priv;
631
632 netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX);
633 if (!netdev) {
634 dev_alert(&card->pdev->dev, "alloc_candev failed\n");
635 return NULL;
636 }
637 priv = netdev_priv(netdev);
638 priv->netdev = netdev;
639 priv->card = card;
640 memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const));
641 priv->btr_const.brp_max = card->pdat->max_brp;
642 priv->btr_const.sjw_max = card->pdat->max_sjw;
643 priv->can.bittiming_const = &priv->btr_const;
644 priv->can.clock.freq = 8000000;
645 priv->chip = chip_id;
646 priv->output = softing_default_output(netdev);
647 SET_NETDEV_DEV(netdev, &card->pdev->dev);
648
649 netdev->flags |= IFF_ECHO;
650 netdev->netdev_ops = &softing_netdev_ops;
651 priv->can.do_set_mode = softing_candev_set_mode;
652 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
653
654 return netdev;
655}
656
657static int softing_netdev_register(struct net_device *netdev)
658{
659 int ret;
660
661 ret = register_candev(netdev);
662 if (ret) {
663 dev_alert(&netdev->dev, "register failed\n");
664 return ret;
665 }
666 if (sysfs_create_group(&netdev->dev.kobj, &netdev_sysfs_group) < 0)
667 netdev_alert(netdev, "sysfs group failed\n");
668
669 return 0;
670}
671
672static void softing_netdev_cleanup(struct net_device *netdev)
673{
674 sysfs_remove_group(&netdev->dev.kobj, &netdev_sysfs_group);
675 unregister_candev(netdev);
676 free_candev(netdev);
677}
678
679/*
680 * sysfs for Platform device
681 */
682#define DEV_ATTR_RO(name, member) \
683static ssize_t show_##name(struct device *dev, \
684 struct device_attribute *attr, char *buf) \
685{ \
686 struct softing *card = dev_get_drvdata(dev); \
687 return sprintf(buf, "%u\n", card->member); \
688} \
689static DEVICE_ATTR(name, 0444, show_##name, NULL)
690
691#define DEV_ATTR_RO_STR(name, member) \
692static ssize_t show_##name(struct device *dev, \
693 struct device_attribute *attr, char *buf) \
694{ \
695 struct softing *card = dev_get_drvdata(dev); \
696 return sprintf(buf, "%s\n", card->member); \
697} \
698static DEVICE_ATTR(name, 0444, show_##name, NULL)
699
700DEV_ATTR_RO(serial, id.serial);
701DEV_ATTR_RO_STR(firmware, pdat->app.fw);
702DEV_ATTR_RO(firmware_version, id.fw_version);
703DEV_ATTR_RO_STR(hardware, pdat->name);
704DEV_ATTR_RO(hardware_version, id.hw_version);
705DEV_ATTR_RO(license, id.license);
706
707static struct attribute *softing_pdev_attrs[] = {
708 &dev_attr_serial.attr,
709 &dev_attr_firmware.attr,
710 &dev_attr_firmware_version.attr,
711 &dev_attr_hardware.attr,
712 &dev_attr_hardware_version.attr,
713 &dev_attr_license.attr,
714 NULL,
715};
716
717static const struct attribute_group softing_pdev_group = {
718 .name = NULL,
719 .attrs = softing_pdev_attrs,
720};
721
722/*
723 * platform driver
724 */
725static int softing_pdev_remove(struct platform_device *pdev)
726{
727 struct softing *card = platform_get_drvdata(pdev);
728 int j;
729
730 /* first, disable card*/
731 softing_card_shutdown(card);
732
733 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
734 if (!card->net[j])
735 continue;
736 softing_netdev_cleanup(card->net[j]);
737 card->net[j] = NULL;
738 }
739 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
740
741 iounmap(card->dpram);
742 kfree(card);
743 return 0;
744}
745
746static int softing_pdev_probe(struct platform_device *pdev)
747{
748 const struct softing_platform_data *pdat = dev_get_platdata(&pdev->dev);
749 struct softing *card;
750 struct net_device *netdev;
751 struct softing_priv *priv;
752 struct resource *pres;
753 int ret;
754 int j;
755
756 if (!pdat) {
757 dev_warn(&pdev->dev, "no platform data\n");
758 return -EINVAL;
759 }
760 if (pdat->nbus > ARRAY_SIZE(card->net)) {
761 dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus);
762 return -EINVAL;
763 }
764
765 card = kzalloc(sizeof(*card), GFP_KERNEL);
766 if (!card)
767 return -ENOMEM;
768 card->pdat = pdat;
769 card->pdev = pdev;
770 platform_set_drvdata(pdev, card);
771 mutex_init(&card->fw.lock);
772 spin_lock_init(&card->spin);
773
774 ret = -EINVAL;
775 pres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
776 if (!pres)
777 goto platform_resource_failed;
778 card->dpram_phys = pres->start;
779 card->dpram_size = resource_size(pres);
780 card->dpram = ioremap(card->dpram_phys, card->dpram_size);
781 if (!card->dpram) {
782 dev_alert(&card->pdev->dev, "dpram ioremap failed\n");
783 goto ioremap_failed;
784 }
785
786 pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
787 if (pres)
788 card->irq.nr = pres->start;
789
790 /* reset card */
791 ret = softing_card_boot(card);
792 if (ret < 0) {
793 dev_alert(&pdev->dev, "failed to boot\n");
794 goto boot_failed;
795 }
796
797 /* only now, the chip's are known */
798 card->id.freq = card->pdat->freq;
799
800 ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group);
801 if (ret < 0) {
802 dev_alert(&card->pdev->dev, "sysfs failed\n");
803 goto sysfs_failed;
804 }
805
806 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
807 card->net[j] = netdev =
808 softing_netdev_create(card, card->id.chip[j]);
809 if (!netdev) {
810 dev_alert(&pdev->dev, "failed to make can[%i]", j);
811 ret = -ENOMEM;
812 goto netdev_failed;
813 }
814 netdev->dev_id = j;
815 priv = netdev_priv(card->net[j]);
816 priv->index = j;
817 ret = softing_netdev_register(netdev);
818 if (ret) {
819 free_candev(netdev);
820 card->net[j] = NULL;
821 dev_alert(&card->pdev->dev,
822 "failed to register can[%i]\n", j);
823 goto netdev_failed;
824 }
825 }
826 dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name);
827 return 0;
828
829netdev_failed:
830 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
831 if (!card->net[j])
832 continue;
833 softing_netdev_cleanup(card->net[j]);
834 }
835 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
836sysfs_failed:
837 softing_card_shutdown(card);
838boot_failed:
839 iounmap(card->dpram);
840ioremap_failed:
841platform_resource_failed:
842 kfree(card);
843 return ret;
844}
845
846static struct platform_driver softing_driver = {
847 .driver = {
848 .name = "softing",
849 },
850 .probe = softing_pdev_probe,
851 .remove = softing_pdev_remove,
852};
853
854module_platform_driver(softing_driver);
855
856MODULE_ALIAS("platform:softing");
857MODULE_DESCRIPTION("Softing DPRAM CAN driver");
858MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>");
859MODULE_LICENSE("GPL v2");