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 */
canif_is_active(struct net_device * netdev)21 static 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 */
softing_set_reset_dpram(struct softing * card)31 static 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
softing_clr_reset_dpram(struct softing * card)41 static 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 */
softing_netdev_start_xmit(struct sk_buff * skb,struct net_device * dev)52 static 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;
114 xmit_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 */
softing_netdev_rx(struct net_device * netdev,const struct can_frame * msg,ktime_t ktime)132 int 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 */
softing_handle_1(struct softing * card)150 static 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 */
softing_irq_thread(int irq,void * dev_id)317 static 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 */
softing_irq_v2(int irq,void * dev_id)355 static 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
softing_irq_v1(int irq,void * dev_id)365 static 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 */
softing_netdev_open(struct net_device * ndev)378 static 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
softing_netdev_stop(struct net_device * ndev)394 static 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
softing_candev_set_mode(struct net_device * ndev,enum can_mode mode)402 static 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 */
softing_enable_irq(struct softing * card,int enable)421 int 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
softing_card_shutdown(struct softing * card)447 static 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
softing_card_boot(struct softing * card)471 static 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;
537 failed:
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 */
show_chip(struct device * dev,struct device_attribute * attr,char * buf)551 static 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
show_output(struct device * dev,struct device_attribute * attr,char * buf)560 static 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
store_output(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)569 static 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
595 static const DEVICE_ATTR(chip, 0444, show_chip, NULL);
596 static const DEVICE_ATTR(output, 0644, show_output, store_output);
597
598 static const struct attribute *const netdev_sysfs_attrs[] = {
599 &dev_attr_chip.attr,
600 &dev_attr_output.attr,
601 NULL,
602 };
603 static const struct attribute_group netdev_sysfs_group = {
604 .name = NULL,
605 .attrs = (struct attribute **)netdev_sysfs_attrs,
606 };
607
608 static 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
615 static const struct ethtool_ops softing_ethtool_ops = {
616 .get_ts_info = ethtool_op_get_ts_info,
617 };
618
619 static 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
softing_netdev_create(struct softing * card,uint16_t chip_id)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 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
softing_netdev_register(struct net_device * netdev)664 static 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
softing_netdev_cleanup(struct net_device * netdev)679 static 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) \
690 static 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 } \
696 static DEVICE_ATTR(name, 0444, show_##name, NULL)
697
698 #define DEV_ATTR_RO_STR(name, member) \
699 static 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 } \
705 static DEVICE_ATTR(name, 0444, show_##name, NULL)
706
707 DEV_ATTR_RO(serial, id.serial);
708 DEV_ATTR_RO_STR(firmware, pdat->app.fw);
709 DEV_ATTR_RO(firmware_version, id.fw_version);
710 DEV_ATTR_RO_STR(hardware, pdat->name);
711 DEV_ATTR_RO(hardware_version, id.hw_version);
712 DEV_ATTR_RO(license, id.license);
713
714 static 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
724 static const struct attribute_group softing_pdev_group = {
725 .name = NULL,
726 .attrs = softing_pdev_attrs,
727 };
728
729 /*
730 * platform driver
731 */
softing_pdev_remove(struct platform_device * pdev)732 static 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
softing_pdev_probe(struct platform_device * pdev)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 = KBUILD_MODNAME,
855 },
856 .probe = softing_pdev_probe,
857 .remove_new = 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");
866