]> Git Repo - linux.git/blob - drivers/net/can/softing/softing_main.c
Merge tag 'cxl-for-6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl
[linux.git] / drivers / net / can / softing / softing_main.c
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  */
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 */
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
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 */
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_dropped_invalid_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  */
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  */
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  */
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  */
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
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  */
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
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
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  */
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
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
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  */
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
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
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
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
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
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  */
732 static int 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         return 0;
751 }
752
753 static int softing_pdev_probe(struct platform_device *pdev)
754 {
755         const struct softing_platform_data *pdat = dev_get_platdata(&pdev->dev);
756         struct softing *card;
757         struct net_device *netdev;
758         struct softing_priv *priv;
759         struct resource *pres;
760         int ret;
761         int j;
762
763         if (!pdat) {
764                 dev_warn(&pdev->dev, "no platform data\n");
765                 return -EINVAL;
766         }
767         if (pdat->nbus > ARRAY_SIZE(card->net)) {
768                 dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus);
769                 return -EINVAL;
770         }
771
772         card = kzalloc(sizeof(*card), GFP_KERNEL);
773         if (!card)
774                 return -ENOMEM;
775         card->pdat = pdat;
776         card->pdev = pdev;
777         platform_set_drvdata(pdev, card);
778         mutex_init(&card->fw.lock);
779         spin_lock_init(&card->spin);
780
781         ret = -EINVAL;
782         pres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
783         if (!pres)
784                 goto platform_resource_failed;
785         card->dpram_phys = pres->start;
786         card->dpram_size = resource_size(pres);
787         card->dpram = ioremap(card->dpram_phys, card->dpram_size);
788         if (!card->dpram) {
789                 dev_alert(&card->pdev->dev, "dpram ioremap failed\n");
790                 goto ioremap_failed;
791         }
792
793         pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
794         if (pres)
795                 card->irq.nr = pres->start;
796
797         /* reset card */
798         ret = softing_card_boot(card);
799         if (ret < 0) {
800                 dev_alert(&pdev->dev, "failed to boot\n");
801                 goto boot_failed;
802         }
803
804         /* only now, the chip's are known */
805         card->id.freq = card->pdat->freq;
806
807         ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group);
808         if (ret < 0) {
809                 dev_alert(&card->pdev->dev, "sysfs failed\n");
810                 goto sysfs_failed;
811         }
812
813         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
814                 card->net[j] = netdev =
815                         softing_netdev_create(card, card->id.chip[j]);
816                 if (!netdev) {
817                         dev_alert(&pdev->dev, "failed to make can[%i]", j);
818                         ret = -ENOMEM;
819                         goto netdev_failed;
820                 }
821                 netdev->dev_id = j;
822                 priv = netdev_priv(card->net[j]);
823                 priv->index = j;
824                 ret = softing_netdev_register(netdev);
825                 if (ret) {
826                         free_candev(netdev);
827                         card->net[j] = NULL;
828                         dev_alert(&card->pdev->dev,
829                                         "failed to register can[%i]\n", j);
830                         goto netdev_failed;
831                 }
832         }
833         dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name);
834         return 0;
835
836 netdev_failed:
837         for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
838                 if (!card->net[j])
839                         continue;
840                 softing_netdev_cleanup(card->net[j]);
841         }
842         sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
843 sysfs_failed:
844         softing_card_shutdown(card);
845 boot_failed:
846         iounmap(card->dpram);
847 ioremap_failed:
848 platform_resource_failed:
849         kfree(card);
850         return ret;
851 }
852
853 static struct platform_driver softing_driver = {
854         .driver = {
855                 .name = KBUILD_MODNAME,
856         },
857         .probe = softing_pdev_probe,
858         .remove = softing_pdev_remove,
859 };
860
861 module_platform_driver(softing_driver);
862
863 MODULE_ALIAS("platform:softing");
864 MODULE_DESCRIPTION("Softing DPRAM CAN driver");
865 MODULE_AUTHOR("Kurt Van Dijck <[email protected]>");
866 MODULE_LICENSE("GPL v2");
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