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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2010-2012 Stephane Grosjean <s.grosjean@peak-system.com>
4 *
5 * CAN driver for PEAK-System PCAN-PC Card
6 * Derived from the PCAN project file driver/src/pcan_pccard.c
7 * Copyright (C) 2006-2010 PEAK System-Technik GmbH
8 */
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/interrupt.h>
12#include <linux/netdevice.h>
13#include <linux/delay.h>
14#include <linux/timer.h>
15#include <linux/io.h>
16#include <pcmcia/cistpl.h>
17#include <pcmcia/ds.h>
18#include <linux/can.h>
19#include <linux/can/dev.h>
20#include "sja1000.h"
21
22MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>");
23MODULE_DESCRIPTION("CAN driver for PEAK-System PCAN-PC Cards");
24MODULE_LICENSE("GPL v2");
25
26/* PEAK-System PCMCIA driver name */
27#define PCC_NAME "peak_pcmcia"
28
29#define PCC_CHAN_MAX 2
30
31#define PCC_CAN_CLOCK (16000000 / 2)
32
33#define PCC_MANF_ID 0x0377
34#define PCC_CARD_ID 0x0001
35
36#define PCC_CHAN_SIZE 0x20
37#define PCC_CHAN_OFF(c) ((c) * PCC_CHAN_SIZE)
38#define PCC_COMN_OFF (PCC_CHAN_OFF(PCC_CHAN_MAX))
39#define PCC_COMN_SIZE 0x40
40
41/* common area registers */
42#define PCC_CCR 0x00
43#define PCC_CSR 0x02
44#define PCC_CPR 0x04
45#define PCC_SPI_DIR 0x06
46#define PCC_SPI_DOR 0x08
47#define PCC_SPI_ADR 0x0a
48#define PCC_SPI_IR 0x0c
49#define PCC_FW_MAJOR 0x10
50#define PCC_FW_MINOR 0x12
51
52/* CCR bits */
53#define PCC_CCR_CLK_16 0x00
54#define PCC_CCR_CLK_10 0x01
55#define PCC_CCR_CLK_21 0x02
56#define PCC_CCR_CLK_8 0x03
57#define PCC_CCR_CLK_MASK PCC_CCR_CLK_8
58
59#define PCC_CCR_RST_CHAN(c) (0x01 << ((c) + 2))
60#define PCC_CCR_RST_ALL (PCC_CCR_RST_CHAN(0) | PCC_CCR_RST_CHAN(1))
61#define PCC_CCR_RST_MASK PCC_CCR_RST_ALL
62
63/* led selection bits */
64#define PCC_LED(c) (1 << (c))
65#define PCC_LED_ALL (PCC_LED(0) | PCC_LED(1))
66
67/* led state value */
68#define PCC_LED_ON 0x00
69#define PCC_LED_FAST 0x01
70#define PCC_LED_SLOW 0x02
71#define PCC_LED_OFF 0x03
72
73#define PCC_CCR_LED_CHAN(s, c) ((s) << (((c) + 2) << 1))
74
75#define PCC_CCR_LED_ON_CHAN(c) PCC_CCR_LED_CHAN(PCC_LED_ON, c)
76#define PCC_CCR_LED_FAST_CHAN(c) PCC_CCR_LED_CHAN(PCC_LED_FAST, c)
77#define PCC_CCR_LED_SLOW_CHAN(c) PCC_CCR_LED_CHAN(PCC_LED_SLOW, c)
78#define PCC_CCR_LED_OFF_CHAN(c) PCC_CCR_LED_CHAN(PCC_LED_OFF, c)
79#define PCC_CCR_LED_MASK_CHAN(c) PCC_CCR_LED_OFF_CHAN(c)
80#define PCC_CCR_LED_OFF_ALL (PCC_CCR_LED_OFF_CHAN(0) | \
81 PCC_CCR_LED_OFF_CHAN(1))
82#define PCC_CCR_LED_MASK PCC_CCR_LED_OFF_ALL
83
84#define PCC_CCR_INIT (PCC_CCR_CLK_16 | PCC_CCR_RST_ALL | PCC_CCR_LED_OFF_ALL)
85
86/* CSR bits */
87#define PCC_CSR_SPI_BUSY 0x04
88
89/* time waiting for SPI busy (prevent from infinite loop) */
90#define PCC_SPI_MAX_BUSY_WAIT_MS 3
91
92/* max count of reading the SPI status register waiting for a change */
93/* (prevent from infinite loop) */
94#define PCC_WRITE_MAX_LOOP 1000
95
96/* max nb of int handled by that isr in one shot (prevent from infinite loop) */
97#define PCC_ISR_MAX_LOOP 10
98
99/* EEPROM chip instruction set */
100/* note: EEPROM Read/Write instructions include A8 bit */
101#define PCC_EEP_WRITE(a) (0x02 | (((a) & 0x100) >> 5))
102#define PCC_EEP_READ(a) (0x03 | (((a) & 0x100) >> 5))
103#define PCC_EEP_WRDI 0x04 /* EEPROM Write Disable */
104#define PCC_EEP_RDSR 0x05 /* EEPROM Read Status Register */
105#define PCC_EEP_WREN 0x06 /* EEPROM Write Enable */
106
107/* EEPROM Status Register bits */
108#define PCC_EEP_SR_WEN 0x02 /* EEPROM SR Write Enable bit */
109#define PCC_EEP_SR_WIP 0x01 /* EEPROM SR Write In Progress bit */
110
111/*
112 * The board configuration is probably following:
113 * RX1 is connected to ground.
114 * TX1 is not connected.
115 * CLKO is not connected.
116 * Setting the OCR register to 0xDA is a good idea.
117 * This means normal output mode, push-pull and the correct polarity.
118 */
119#define PCC_OCR (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)
120
121/*
122 * In the CDR register, you should set CBP to 1.
123 * You will probably also want to set the clock divider value to 7
124 * (meaning direct oscillator output) because the second SJA1000 chip
125 * is driven by the first one CLKOUT output.
126 */
127#define PCC_CDR (CDR_CBP | CDR_CLKOUT_MASK)
128
129struct pcan_channel {
130 struct net_device *netdev;
131 unsigned long prev_rx_bytes;
132 unsigned long prev_tx_bytes;
133};
134
135/* PCAN-PC Card private structure */
136struct pcan_pccard {
137 struct pcmcia_device *pdev;
138 int chan_count;
139 struct pcan_channel channel[PCC_CHAN_MAX];
140 u8 ccr;
141 u8 fw_major;
142 u8 fw_minor;
143 void __iomem *ioport_addr;
144 struct timer_list led_timer;
145};
146
147static struct pcmcia_device_id pcan_table[] = {
148 PCMCIA_DEVICE_MANF_CARD(PCC_MANF_ID, PCC_CARD_ID),
149 PCMCIA_DEVICE_NULL,
150};
151
152MODULE_DEVICE_TABLE(pcmcia, pcan_table);
153
154static void pcan_set_leds(struct pcan_pccard *card, u8 mask, u8 state);
155
156/*
157 * start timer which controls leds state
158 */
159static void pcan_start_led_timer(struct pcan_pccard *card)
160{
161 if (!timer_pending(&card->led_timer))
162 mod_timer(&card->led_timer, jiffies + HZ);
163}
164
165/*
166 * stop the timer which controls leds state
167 */
168static void pcan_stop_led_timer(struct pcan_pccard *card)
169{
170 del_timer_sync(&card->led_timer);
171}
172
173/*
174 * read a sja1000 register
175 */
176static u8 pcan_read_canreg(const struct sja1000_priv *priv, int port)
177{
178 return ioread8(priv->reg_base + port);
179}
180
181/*
182 * write a sja1000 register
183 */
184static void pcan_write_canreg(const struct sja1000_priv *priv, int port, u8 v)
185{
186 struct pcan_pccard *card = priv->priv;
187 int c = (priv->reg_base - card->ioport_addr) / PCC_CHAN_SIZE;
188
189 /* sja1000 register changes control the leds state */
190 if (port == SJA1000_MOD)
191 switch (v) {
192 case MOD_RM:
193 /* Reset Mode: set led on */
194 pcan_set_leds(card, PCC_LED(c), PCC_LED_ON);
195 break;
196 case 0x00:
197 /* Normal Mode: led slow blinking and start led timer */
198 pcan_set_leds(card, PCC_LED(c), PCC_LED_SLOW);
199 pcan_start_led_timer(card);
200 break;
201 default:
202 break;
203 }
204
205 iowrite8(v, priv->reg_base + port);
206}
207
208/*
209 * read a register from the common area
210 */
211static u8 pcan_read_reg(struct pcan_pccard *card, int port)
212{
213 return ioread8(card->ioport_addr + PCC_COMN_OFF + port);
214}
215
216/*
217 * write a register into the common area
218 */
219static void pcan_write_reg(struct pcan_pccard *card, int port, u8 v)
220{
221 /* cache ccr value */
222 if (port == PCC_CCR) {
223 if (card->ccr == v)
224 return;
225 card->ccr = v;
226 }
227
228 iowrite8(v, card->ioport_addr + PCC_COMN_OFF + port);
229}
230
231/*
232 * check whether the card is present by checking its fw version numbers
233 * against values read at probing time.
234 */
235static inline int pcan_pccard_present(struct pcan_pccard *card)
236{
237 return ((pcan_read_reg(card, PCC_FW_MAJOR) == card->fw_major) &&
238 (pcan_read_reg(card, PCC_FW_MINOR) == card->fw_minor));
239}
240
241/*
242 * wait for SPI engine while it is busy
243 */
244static int pcan_wait_spi_busy(struct pcan_pccard *card)
245{
246 unsigned long timeout = jiffies +
247 msecs_to_jiffies(PCC_SPI_MAX_BUSY_WAIT_MS) + 1;
248
249 /* be sure to read status at least once after sleeping */
250 while (pcan_read_reg(card, PCC_CSR) & PCC_CSR_SPI_BUSY) {
251 if (time_after(jiffies, timeout))
252 return -EBUSY;
253 schedule();
254 }
255
256 return 0;
257}
258
259/*
260 * write data in device eeprom
261 */
262static int pcan_write_eeprom(struct pcan_pccard *card, u16 addr, u8 v)
263{
264 u8 status;
265 int err, i;
266
267 /* write instruction enabling write */
268 pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WREN);
269 err = pcan_wait_spi_busy(card);
270 if (err)
271 goto we_spi_err;
272
273 /* wait until write enabled */
274 for (i = 0; i < PCC_WRITE_MAX_LOOP; i++) {
275 /* write instruction reading the status register */
276 pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_RDSR);
277 err = pcan_wait_spi_busy(card);
278 if (err)
279 goto we_spi_err;
280
281 /* get status register value and check write enable bit */
282 status = pcan_read_reg(card, PCC_SPI_DIR);
283 if (status & PCC_EEP_SR_WEN)
284 break;
285 }
286
287 if (i >= PCC_WRITE_MAX_LOOP) {
288 dev_err(&card->pdev->dev,
289 "stop waiting to be allowed to write in eeprom\n");
290 return -EIO;
291 }
292
293 /* set address and data */
294 pcan_write_reg(card, PCC_SPI_ADR, addr & 0xff);
295 pcan_write_reg(card, PCC_SPI_DOR, v);
296
297 /*
298 * write instruction with bit[3] set according to address value:
299 * if addr refers to upper half of the memory array: bit[3] = 1
300 */
301 pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WRITE(addr));
302 err = pcan_wait_spi_busy(card);
303 if (err)
304 goto we_spi_err;
305
306 /* wait while write in progress */
307 for (i = 0; i < PCC_WRITE_MAX_LOOP; i++) {
308 /* write instruction reading the status register */
309 pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_RDSR);
310 err = pcan_wait_spi_busy(card);
311 if (err)
312 goto we_spi_err;
313
314 /* get status register value and check write in progress bit */
315 status = pcan_read_reg(card, PCC_SPI_DIR);
316 if (!(status & PCC_EEP_SR_WIP))
317 break;
318 }
319
320 if (i >= PCC_WRITE_MAX_LOOP) {
321 dev_err(&card->pdev->dev,
322 "stop waiting for write in eeprom to complete\n");
323 return -EIO;
324 }
325
326 /* write instruction disabling write */
327 pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WRDI);
328 err = pcan_wait_spi_busy(card);
329 if (err)
330 goto we_spi_err;
331
332 return 0;
333
334we_spi_err:
335 dev_err(&card->pdev->dev,
336 "stop waiting (spi engine always busy) err %d\n", err);
337
338 return err;
339}
340
341static void pcan_set_leds(struct pcan_pccard *card, u8 led_mask, u8 state)
342{
343 u8 ccr = card->ccr;
344 int i;
345
346 for (i = 0; i < card->chan_count; i++)
347 if (led_mask & PCC_LED(i)) {
348 /* clear corresponding led bits in ccr */
349 ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
350 /* then set new bits */
351 ccr |= PCC_CCR_LED_CHAN(state, i);
352 }
353
354 /* real write only if something has changed in ccr */
355 pcan_write_reg(card, PCC_CCR, ccr);
356}
357
358/*
359 * enable/disable CAN connectors power
360 */
361static inline void pcan_set_can_power(struct pcan_pccard *card, int onoff)
362{
363 int err;
364
365 err = pcan_write_eeprom(card, 0, !!onoff);
366 if (err)
367 dev_err(&card->pdev->dev,
368 "failed setting power %s to can connectors (err %d)\n",
369 (onoff) ? "on" : "off", err);
370}
371
372/*
373 * set leds state according to channel activity
374 */
375static void pcan_led_timer(struct timer_list *t)
376{
377 struct pcan_pccard *card = from_timer(card, t, led_timer);
378 struct net_device *netdev;
379 int i, up_count = 0;
380 u8 ccr;
381
382 ccr = card->ccr;
383 for (i = 0; i < card->chan_count; i++) {
384 /* default is: not configured */
385 ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
386 ccr |= PCC_CCR_LED_ON_CHAN(i);
387
388 netdev = card->channel[i].netdev;
389 if (!netdev || !(netdev->flags & IFF_UP))
390 continue;
391
392 up_count++;
393
394 /* no activity (but configured) */
395 ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
396 ccr |= PCC_CCR_LED_SLOW_CHAN(i);
397
398 /* if bytes counters changed, set fast blinking led */
399 if (netdev->stats.rx_bytes != card->channel[i].prev_rx_bytes) {
400 card->channel[i].prev_rx_bytes = netdev->stats.rx_bytes;
401 ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
402 ccr |= PCC_CCR_LED_FAST_CHAN(i);
403 }
404 if (netdev->stats.tx_bytes != card->channel[i].prev_tx_bytes) {
405 card->channel[i].prev_tx_bytes = netdev->stats.tx_bytes;
406 ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
407 ccr |= PCC_CCR_LED_FAST_CHAN(i);
408 }
409 }
410
411 /* write the new leds state */
412 pcan_write_reg(card, PCC_CCR, ccr);
413
414 /* restart timer (except if no more configured channels) */
415 if (up_count)
416 mod_timer(&card->led_timer, jiffies + HZ);
417}
418
419/*
420 * interrupt service routine
421 */
422static irqreturn_t pcan_isr(int irq, void *dev_id)
423{
424 struct pcan_pccard *card = dev_id;
425 int irq_handled;
426
427 /* prevent from infinite loop */
428 for (irq_handled = 0; irq_handled < PCC_ISR_MAX_LOOP; irq_handled++) {
429 /* handle shared interrupt and next loop */
430 int nothing_to_handle = 1;
431 int i;
432
433 /* check interrupt for each channel */
434 for (i = 0; i < card->chan_count; i++) {
435 struct net_device *netdev;
436
437 /*
438 * check whether the card is present before calling
439 * sja1000_interrupt() to speed up hotplug detection
440 */
441 if (!pcan_pccard_present(card)) {
442 /* card unplugged during isr */
443 return IRQ_NONE;
444 }
445
446 /*
447 * should check whether all or SJA1000_MAX_IRQ
448 * interrupts have been handled: loop again to be sure.
449 */
450 netdev = card->channel[i].netdev;
451 if (netdev &&
452 sja1000_interrupt(irq, netdev) == IRQ_HANDLED)
453 nothing_to_handle = 0;
454 }
455
456 if (nothing_to_handle)
457 break;
458 }
459
460 return (irq_handled) ? IRQ_HANDLED : IRQ_NONE;
461}
462
463/*
464 * free all resources used by the channels and switch off leds and can power
465 */
466static void pcan_free_channels(struct pcan_pccard *card)
467{
468 int i;
469 u8 led_mask = 0;
470
471 for (i = 0; i < card->chan_count; i++) {
472 struct net_device *netdev;
473 char name[IFNAMSIZ];
474
475 led_mask |= PCC_LED(i);
476
477 netdev = card->channel[i].netdev;
478 if (!netdev)
479 continue;
480
481 strscpy(name, netdev->name, IFNAMSIZ);
482
483 unregister_sja1000dev(netdev);
484
485 free_sja1000dev(netdev);
486
487 dev_info(&card->pdev->dev, "%s removed\n", name);
488 }
489
490 /* do it only if device not removed */
491 if (pcan_pccard_present(card)) {
492 pcan_set_leds(card, led_mask, PCC_LED_OFF);
493 pcan_set_can_power(card, 0);
494 }
495}
496
497/*
498 * check if a CAN controller is present at the specified location
499 */
500static inline int pcan_channel_present(struct sja1000_priv *priv)
501{
502 /* make sure SJA1000 is in reset mode */
503 pcan_write_canreg(priv, SJA1000_MOD, 1);
504 pcan_write_canreg(priv, SJA1000_CDR, CDR_PELICAN);
505
506 /* read reset-values */
507 if (pcan_read_canreg(priv, SJA1000_CDR) == CDR_PELICAN)
508 return 1;
509
510 return 0;
511}
512
513static int pcan_add_channels(struct pcan_pccard *card)
514{
515 struct pcmcia_device *pdev = card->pdev;
516 int i, err = 0;
517 u8 ccr = PCC_CCR_INIT;
518
519 /* init common registers (reset channels and leds off) */
520 card->ccr = ~ccr;
521 pcan_write_reg(card, PCC_CCR, ccr);
522
523 /* wait 2ms before unresetting channels */
524 usleep_range(2000, 3000);
525
526 ccr &= ~PCC_CCR_RST_ALL;
527 pcan_write_reg(card, PCC_CCR, ccr);
528
529 /* create one network device per channel detected */
530 for (i = 0; i < ARRAY_SIZE(card->channel); i++) {
531 struct net_device *netdev;
532 struct sja1000_priv *priv;
533
534 netdev = alloc_sja1000dev(0);
535 if (!netdev) {
536 err = -ENOMEM;
537 break;
538 }
539
540 /* update linkages */
541 priv = netdev_priv(netdev);
542 priv->priv = card;
543 SET_NETDEV_DEV(netdev, &pdev->dev);
544 netdev->dev_id = i;
545
546 priv->irq_flags = IRQF_SHARED;
547 netdev->irq = pdev->irq;
548 priv->reg_base = card->ioport_addr + PCC_CHAN_OFF(i);
549
550 /* check if channel is present */
551 if (!pcan_channel_present(priv)) {
552 dev_err(&pdev->dev, "channel %d not present\n", i);
553 free_sja1000dev(netdev);
554 continue;
555 }
556
557 priv->read_reg = pcan_read_canreg;
558 priv->write_reg = pcan_write_canreg;
559 priv->can.clock.freq = PCC_CAN_CLOCK;
560 priv->ocr = PCC_OCR;
561 priv->cdr = PCC_CDR;
562
563 /* Neither a slave device distributes the clock */
564 if (i > 0)
565 priv->cdr |= CDR_CLK_OFF;
566
567 priv->flags |= SJA1000_CUSTOM_IRQ_HANDLER;
568
569 /* register SJA1000 device */
570 err = register_sja1000dev(netdev);
571 if (err) {
572 free_sja1000dev(netdev);
573 continue;
574 }
575
576 card->channel[i].netdev = netdev;
577 card->chan_count++;
578
579 /* set corresponding led on in the new ccr */
580 ccr &= ~PCC_CCR_LED_OFF_CHAN(i);
581
582 dev_info(&pdev->dev,
583 "%s on channel %d at 0x%p irq %d\n",
584 netdev->name, i, priv->reg_base, pdev->irq);
585 }
586
587 /* write new ccr (change leds state) */
588 pcan_write_reg(card, PCC_CCR, ccr);
589
590 return err;
591}
592
593static int pcan_conf_check(struct pcmcia_device *pdev, void *priv_data)
594{
595 pdev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
596 pdev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8; /* only */
597 pdev->io_lines = 10;
598
599 /* This reserves IO space but doesn't actually enable it */
600 return pcmcia_request_io(pdev);
601}
602
603/*
604 * free all resources used by the device
605 */
606static void pcan_free(struct pcmcia_device *pdev)
607{
608 struct pcan_pccard *card = pdev->priv;
609
610 if (!card)
611 return;
612
613 free_irq(pdev->irq, card);
614 pcan_stop_led_timer(card);
615
616 pcan_free_channels(card);
617
618 ioport_unmap(card->ioport_addr);
619
620 kfree(card);
621 pdev->priv = NULL;
622}
623
624/*
625 * setup PCMCIA socket and probe for PEAK-System PC-CARD
626 */
627static int pcan_probe(struct pcmcia_device *pdev)
628{
629 struct pcan_pccard *card;
630 int err;
631
632 pdev->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
633
634 err = pcmcia_loop_config(pdev, pcan_conf_check, NULL);
635 if (err) {
636 dev_err(&pdev->dev, "pcmcia_loop_config() error %d\n", err);
637 goto probe_err_1;
638 }
639
640 if (!pdev->irq) {
641 dev_err(&pdev->dev, "no irq assigned\n");
642 err = -ENODEV;
643 goto probe_err_1;
644 }
645
646 err = pcmcia_enable_device(pdev);
647 if (err) {
648 dev_err(&pdev->dev, "pcmcia_enable_device failed err=%d\n",
649 err);
650 goto probe_err_1;
651 }
652
653 card = kzalloc(sizeof(struct pcan_pccard), GFP_KERNEL);
654 if (!card) {
655 err = -ENOMEM;
656 goto probe_err_2;
657 }
658
659 card->pdev = pdev;
660 pdev->priv = card;
661
662 /* sja1000 api uses iomem */
663 card->ioport_addr = ioport_map(pdev->resource[0]->start,
664 resource_size(pdev->resource[0]));
665 if (!card->ioport_addr) {
666 dev_err(&pdev->dev, "couldn't map io port into io memory\n");
667 err = -ENOMEM;
668 goto probe_err_3;
669 }
670 card->fw_major = pcan_read_reg(card, PCC_FW_MAJOR);
671 card->fw_minor = pcan_read_reg(card, PCC_FW_MINOR);
672
673 /* display board name and firmware version */
674 dev_info(&pdev->dev, "PEAK-System pcmcia card %s fw %d.%d\n",
675 pdev->prod_id[1] ? pdev->prod_id[1] : "PCAN-PC Card",
676 card->fw_major, card->fw_minor);
677
678 /* detect available channels */
679 pcan_add_channels(card);
680 if (!card->chan_count) {
681 err = -ENOMEM;
682 goto probe_err_4;
683 }
684
685 /* init the timer which controls the leds */
686 timer_setup(&card->led_timer, pcan_led_timer, 0);
687
688 /* request the given irq */
689 err = request_irq(pdev->irq, &pcan_isr, IRQF_SHARED, PCC_NAME, card);
690 if (err) {
691 dev_err(&pdev->dev, "couldn't request irq%d\n", pdev->irq);
692 goto probe_err_5;
693 }
694
695 /* power on the connectors */
696 pcan_set_can_power(card, 1);
697
698 return 0;
699
700probe_err_5:
701 /* unregister can devices from network */
702 pcan_free_channels(card);
703
704probe_err_4:
705 ioport_unmap(card->ioport_addr);
706
707probe_err_3:
708 kfree(card);
709 pdev->priv = NULL;
710
711probe_err_2:
712 pcmcia_disable_device(pdev);
713
714probe_err_1:
715 return err;
716}
717
718/*
719 * release claimed resources
720 */
721static void pcan_remove(struct pcmcia_device *pdev)
722{
723 pcan_free(pdev);
724 pcmcia_disable_device(pdev);
725}
726
727static struct pcmcia_driver pcan_driver = {
728 .name = PCC_NAME,
729 .probe = pcan_probe,
730 .remove = pcan_remove,
731 .id_table = pcan_table,
732};
733module_pcmcia_driver(pcan_driver);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2010-2012 Stephane Grosjean <s.grosjean@peak-system.com>
4 *
5 * CAN driver for PEAK-System PCAN-PC Card
6 * Derived from the PCAN project file driver/src/pcan_pccard.c
7 * Copyright (C) 2006-2010 PEAK System-Technik GmbH
8 */
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/interrupt.h>
12#include <linux/netdevice.h>
13#include <linux/delay.h>
14#include <linux/timer.h>
15#include <linux/io.h>
16#include <pcmcia/cistpl.h>
17#include <pcmcia/ds.h>
18#include <linux/can.h>
19#include <linux/can/dev.h>
20#include "sja1000.h"
21
22MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>");
23MODULE_DESCRIPTION("CAN driver for PEAK-System PCAN-PC Cards");
24MODULE_LICENSE("GPL v2");
25MODULE_SUPPORTED_DEVICE("PEAK PCAN-PC Card");
26
27/* PEAK-System PCMCIA driver name */
28#define PCC_NAME "peak_pcmcia"
29
30#define PCC_CHAN_MAX 2
31
32#define PCC_CAN_CLOCK (16000000 / 2)
33
34#define PCC_MANF_ID 0x0377
35#define PCC_CARD_ID 0x0001
36
37#define PCC_CHAN_SIZE 0x20
38#define PCC_CHAN_OFF(c) ((c) * PCC_CHAN_SIZE)
39#define PCC_COMN_OFF (PCC_CHAN_OFF(PCC_CHAN_MAX))
40#define PCC_COMN_SIZE 0x40
41
42/* common area registers */
43#define PCC_CCR 0x00
44#define PCC_CSR 0x02
45#define PCC_CPR 0x04
46#define PCC_SPI_DIR 0x06
47#define PCC_SPI_DOR 0x08
48#define PCC_SPI_ADR 0x0a
49#define PCC_SPI_IR 0x0c
50#define PCC_FW_MAJOR 0x10
51#define PCC_FW_MINOR 0x12
52
53/* CCR bits */
54#define PCC_CCR_CLK_16 0x00
55#define PCC_CCR_CLK_10 0x01
56#define PCC_CCR_CLK_21 0x02
57#define PCC_CCR_CLK_8 0x03
58#define PCC_CCR_CLK_MASK PCC_CCR_CLK_8
59
60#define PCC_CCR_RST_CHAN(c) (0x01 << ((c) + 2))
61#define PCC_CCR_RST_ALL (PCC_CCR_RST_CHAN(0) | PCC_CCR_RST_CHAN(1))
62#define PCC_CCR_RST_MASK PCC_CCR_RST_ALL
63
64/* led selection bits */
65#define PCC_LED(c) (1 << (c))
66#define PCC_LED_ALL (PCC_LED(0) | PCC_LED(1))
67
68/* led state value */
69#define PCC_LED_ON 0x00
70#define PCC_LED_FAST 0x01
71#define PCC_LED_SLOW 0x02
72#define PCC_LED_OFF 0x03
73
74#define PCC_CCR_LED_CHAN(s, c) ((s) << (((c) + 2) << 1))
75
76#define PCC_CCR_LED_ON_CHAN(c) PCC_CCR_LED_CHAN(PCC_LED_ON, c)
77#define PCC_CCR_LED_FAST_CHAN(c) PCC_CCR_LED_CHAN(PCC_LED_FAST, c)
78#define PCC_CCR_LED_SLOW_CHAN(c) PCC_CCR_LED_CHAN(PCC_LED_SLOW, c)
79#define PCC_CCR_LED_OFF_CHAN(c) PCC_CCR_LED_CHAN(PCC_LED_OFF, c)
80#define PCC_CCR_LED_MASK_CHAN(c) PCC_CCR_LED_OFF_CHAN(c)
81#define PCC_CCR_LED_OFF_ALL (PCC_CCR_LED_OFF_CHAN(0) | \
82 PCC_CCR_LED_OFF_CHAN(1))
83#define PCC_CCR_LED_MASK PCC_CCR_LED_OFF_ALL
84
85#define PCC_CCR_INIT (PCC_CCR_CLK_16 | PCC_CCR_RST_ALL | PCC_CCR_LED_OFF_ALL)
86
87/* CSR bits */
88#define PCC_CSR_SPI_BUSY 0x04
89
90/* time waiting for SPI busy (prevent from infinite loop) */
91#define PCC_SPI_MAX_BUSY_WAIT_MS 3
92
93/* max count of reading the SPI status register waiting for a change */
94/* (prevent from infinite loop) */
95#define PCC_WRITE_MAX_LOOP 1000
96
97/* max nb of int handled by that isr in one shot (prevent from infinite loop) */
98#define PCC_ISR_MAX_LOOP 10
99
100/* EEPROM chip instruction set */
101/* note: EEPROM Read/Write instructions include A8 bit */
102#define PCC_EEP_WRITE(a) (0x02 | (((a) & 0x100) >> 5))
103#define PCC_EEP_READ(a) (0x03 | (((a) & 0x100) >> 5))
104#define PCC_EEP_WRDI 0x04 /* EEPROM Write Disable */
105#define PCC_EEP_RDSR 0x05 /* EEPROM Read Status Register */
106#define PCC_EEP_WREN 0x06 /* EEPROM Write Enable */
107
108/* EEPROM Status Register bits */
109#define PCC_EEP_SR_WEN 0x02 /* EEPROM SR Write Enable bit */
110#define PCC_EEP_SR_WIP 0x01 /* EEPROM SR Write In Progress bit */
111
112/*
113 * The board configuration is probably following:
114 * RX1 is connected to ground.
115 * TX1 is not connected.
116 * CLKO is not connected.
117 * Setting the OCR register to 0xDA is a good idea.
118 * This means normal output mode, push-pull and the correct polarity.
119 */
120#define PCC_OCR (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)
121
122/*
123 * In the CDR register, you should set CBP to 1.
124 * You will probably also want to set the clock divider value to 7
125 * (meaning direct oscillator output) because the second SJA1000 chip
126 * is driven by the first one CLKOUT output.
127 */
128#define PCC_CDR (CDR_CBP | CDR_CLKOUT_MASK)
129
130struct pcan_channel {
131 struct net_device *netdev;
132 unsigned long prev_rx_bytes;
133 unsigned long prev_tx_bytes;
134};
135
136/* PCAN-PC Card private structure */
137struct pcan_pccard {
138 struct pcmcia_device *pdev;
139 int chan_count;
140 struct pcan_channel channel[PCC_CHAN_MAX];
141 u8 ccr;
142 u8 fw_major;
143 u8 fw_minor;
144 void __iomem *ioport_addr;
145 struct timer_list led_timer;
146};
147
148static struct pcmcia_device_id pcan_table[] = {
149 PCMCIA_DEVICE_MANF_CARD(PCC_MANF_ID, PCC_CARD_ID),
150 PCMCIA_DEVICE_NULL,
151};
152
153MODULE_DEVICE_TABLE(pcmcia, pcan_table);
154
155static void pcan_set_leds(struct pcan_pccard *card, u8 mask, u8 state);
156
157/*
158 * start timer which controls leds state
159 */
160static void pcan_start_led_timer(struct pcan_pccard *card)
161{
162 if (!timer_pending(&card->led_timer))
163 mod_timer(&card->led_timer, jiffies + HZ);
164}
165
166/*
167 * stop the timer which controls leds state
168 */
169static void pcan_stop_led_timer(struct pcan_pccard *card)
170{
171 del_timer_sync(&card->led_timer);
172}
173
174/*
175 * read a sja1000 register
176 */
177static u8 pcan_read_canreg(const struct sja1000_priv *priv, int port)
178{
179 return ioread8(priv->reg_base + port);
180}
181
182/*
183 * write a sja1000 register
184 */
185static void pcan_write_canreg(const struct sja1000_priv *priv, int port, u8 v)
186{
187 struct pcan_pccard *card = priv->priv;
188 int c = (priv->reg_base - card->ioport_addr) / PCC_CHAN_SIZE;
189
190 /* sja1000 register changes control the leds state */
191 if (port == SJA1000_MOD)
192 switch (v) {
193 case MOD_RM:
194 /* Reset Mode: set led on */
195 pcan_set_leds(card, PCC_LED(c), PCC_LED_ON);
196 break;
197 case 0x00:
198 /* Normal Mode: led slow blinking and start led timer */
199 pcan_set_leds(card, PCC_LED(c), PCC_LED_SLOW);
200 pcan_start_led_timer(card);
201 break;
202 default:
203 break;
204 }
205
206 iowrite8(v, priv->reg_base + port);
207}
208
209/*
210 * read a register from the common area
211 */
212static u8 pcan_read_reg(struct pcan_pccard *card, int port)
213{
214 return ioread8(card->ioport_addr + PCC_COMN_OFF + port);
215}
216
217/*
218 * write a register into the common area
219 */
220static void pcan_write_reg(struct pcan_pccard *card, int port, u8 v)
221{
222 /* cache ccr value */
223 if (port == PCC_CCR) {
224 if (card->ccr == v)
225 return;
226 card->ccr = v;
227 }
228
229 iowrite8(v, card->ioport_addr + PCC_COMN_OFF + port);
230}
231
232/*
233 * check whether the card is present by checking its fw version numbers
234 * against values read at probing time.
235 */
236static inline int pcan_pccard_present(struct pcan_pccard *card)
237{
238 return ((pcan_read_reg(card, PCC_FW_MAJOR) == card->fw_major) &&
239 (pcan_read_reg(card, PCC_FW_MINOR) == card->fw_minor));
240}
241
242/*
243 * wait for SPI engine while it is busy
244 */
245static int pcan_wait_spi_busy(struct pcan_pccard *card)
246{
247 unsigned long timeout = jiffies +
248 msecs_to_jiffies(PCC_SPI_MAX_BUSY_WAIT_MS) + 1;
249
250 /* be sure to read status at least once after sleeping */
251 while (pcan_read_reg(card, PCC_CSR) & PCC_CSR_SPI_BUSY) {
252 if (time_after(jiffies, timeout))
253 return -EBUSY;
254 schedule();
255 }
256
257 return 0;
258}
259
260/*
261 * write data in device eeprom
262 */
263static int pcan_write_eeprom(struct pcan_pccard *card, u16 addr, u8 v)
264{
265 u8 status;
266 int err, i;
267
268 /* write instruction enabling write */
269 pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WREN);
270 err = pcan_wait_spi_busy(card);
271 if (err)
272 goto we_spi_err;
273
274 /* wait until write enabled */
275 for (i = 0; i < PCC_WRITE_MAX_LOOP; i++) {
276 /* write instruction reading the status register */
277 pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_RDSR);
278 err = pcan_wait_spi_busy(card);
279 if (err)
280 goto we_spi_err;
281
282 /* get status register value and check write enable bit */
283 status = pcan_read_reg(card, PCC_SPI_DIR);
284 if (status & PCC_EEP_SR_WEN)
285 break;
286 }
287
288 if (i >= PCC_WRITE_MAX_LOOP) {
289 dev_err(&card->pdev->dev,
290 "stop waiting to be allowed to write in eeprom\n");
291 return -EIO;
292 }
293
294 /* set address and data */
295 pcan_write_reg(card, PCC_SPI_ADR, addr & 0xff);
296 pcan_write_reg(card, PCC_SPI_DOR, v);
297
298 /*
299 * write instruction with bit[3] set according to address value:
300 * if addr refers to upper half of the memory array: bit[3] = 1
301 */
302 pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WRITE(addr));
303 err = pcan_wait_spi_busy(card);
304 if (err)
305 goto we_spi_err;
306
307 /* wait while write in progress */
308 for (i = 0; i < PCC_WRITE_MAX_LOOP; i++) {
309 /* write instruction reading the status register */
310 pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_RDSR);
311 err = pcan_wait_spi_busy(card);
312 if (err)
313 goto we_spi_err;
314
315 /* get status register value and check write in progress bit */
316 status = pcan_read_reg(card, PCC_SPI_DIR);
317 if (!(status & PCC_EEP_SR_WIP))
318 break;
319 }
320
321 if (i >= PCC_WRITE_MAX_LOOP) {
322 dev_err(&card->pdev->dev,
323 "stop waiting for write in eeprom to complete\n");
324 return -EIO;
325 }
326
327 /* write instruction disabling write */
328 pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WRDI);
329 err = pcan_wait_spi_busy(card);
330 if (err)
331 goto we_spi_err;
332
333 return 0;
334
335we_spi_err:
336 dev_err(&card->pdev->dev,
337 "stop waiting (spi engine always busy) err %d\n", err);
338
339 return err;
340}
341
342static void pcan_set_leds(struct pcan_pccard *card, u8 led_mask, u8 state)
343{
344 u8 ccr = card->ccr;
345 int i;
346
347 for (i = 0; i < card->chan_count; i++)
348 if (led_mask & PCC_LED(i)) {
349 /* clear corresponding led bits in ccr */
350 ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
351 /* then set new bits */
352 ccr |= PCC_CCR_LED_CHAN(state, i);
353 }
354
355 /* real write only if something has changed in ccr */
356 pcan_write_reg(card, PCC_CCR, ccr);
357}
358
359/*
360 * enable/disable CAN connectors power
361 */
362static inline void pcan_set_can_power(struct pcan_pccard *card, int onoff)
363{
364 int err;
365
366 err = pcan_write_eeprom(card, 0, !!onoff);
367 if (err)
368 dev_err(&card->pdev->dev,
369 "failed setting power %s to can connectors (err %d)\n",
370 (onoff) ? "on" : "off", err);
371}
372
373/*
374 * set leds state according to channel activity
375 */
376static void pcan_led_timer(struct timer_list *t)
377{
378 struct pcan_pccard *card = from_timer(card, t, led_timer);
379 struct net_device *netdev;
380 int i, up_count = 0;
381 u8 ccr;
382
383 ccr = card->ccr;
384 for (i = 0; i < card->chan_count; i++) {
385 /* default is: not configured */
386 ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
387 ccr |= PCC_CCR_LED_ON_CHAN(i);
388
389 netdev = card->channel[i].netdev;
390 if (!netdev || !(netdev->flags & IFF_UP))
391 continue;
392
393 up_count++;
394
395 /* no activity (but configured) */
396 ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
397 ccr |= PCC_CCR_LED_SLOW_CHAN(i);
398
399 /* if bytes counters changed, set fast blinking led */
400 if (netdev->stats.rx_bytes != card->channel[i].prev_rx_bytes) {
401 card->channel[i].prev_rx_bytes = netdev->stats.rx_bytes;
402 ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
403 ccr |= PCC_CCR_LED_FAST_CHAN(i);
404 }
405 if (netdev->stats.tx_bytes != card->channel[i].prev_tx_bytes) {
406 card->channel[i].prev_tx_bytes = netdev->stats.tx_bytes;
407 ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
408 ccr |= PCC_CCR_LED_FAST_CHAN(i);
409 }
410 }
411
412 /* write the new leds state */
413 pcan_write_reg(card, PCC_CCR, ccr);
414
415 /* restart timer (except if no more configured channels) */
416 if (up_count)
417 mod_timer(&card->led_timer, jiffies + HZ);
418}
419
420/*
421 * interrupt service routine
422 */
423static irqreturn_t pcan_isr(int irq, void *dev_id)
424{
425 struct pcan_pccard *card = dev_id;
426 int irq_handled;
427
428 /* prevent from infinite loop */
429 for (irq_handled = 0; irq_handled < PCC_ISR_MAX_LOOP; irq_handled++) {
430 /* handle shared interrupt and next loop */
431 int nothing_to_handle = 1;
432 int i;
433
434 /* check interrupt for each channel */
435 for (i = 0; i < card->chan_count; i++) {
436 struct net_device *netdev;
437
438 /*
439 * check whether the card is present before calling
440 * sja1000_interrupt() to speed up hotplug detection
441 */
442 if (!pcan_pccard_present(card)) {
443 /* card unplugged during isr */
444 return IRQ_NONE;
445 }
446
447 /*
448 * should check whether all or SJA1000_MAX_IRQ
449 * interrupts have been handled: loop again to be sure.
450 */
451 netdev = card->channel[i].netdev;
452 if (netdev &&
453 sja1000_interrupt(irq, netdev) == IRQ_HANDLED)
454 nothing_to_handle = 0;
455 }
456
457 if (nothing_to_handle)
458 break;
459 }
460
461 return (irq_handled) ? IRQ_HANDLED : IRQ_NONE;
462}
463
464/*
465 * free all resources used by the channels and switch off leds and can power
466 */
467static void pcan_free_channels(struct pcan_pccard *card)
468{
469 int i;
470 u8 led_mask = 0;
471
472 for (i = 0; i < card->chan_count; i++) {
473 struct net_device *netdev;
474 char name[IFNAMSIZ];
475
476 led_mask |= PCC_LED(i);
477
478 netdev = card->channel[i].netdev;
479 if (!netdev)
480 continue;
481
482 strlcpy(name, netdev->name, IFNAMSIZ);
483
484 unregister_sja1000dev(netdev);
485
486 free_sja1000dev(netdev);
487
488 dev_info(&card->pdev->dev, "%s removed\n", name);
489 }
490
491 /* do it only if device not removed */
492 if (pcan_pccard_present(card)) {
493 pcan_set_leds(card, led_mask, PCC_LED_OFF);
494 pcan_set_can_power(card, 0);
495 }
496}
497
498/*
499 * check if a CAN controller is present at the specified location
500 */
501static inline int pcan_channel_present(struct sja1000_priv *priv)
502{
503 /* make sure SJA1000 is in reset mode */
504 pcan_write_canreg(priv, SJA1000_MOD, 1);
505 pcan_write_canreg(priv, SJA1000_CDR, CDR_PELICAN);
506
507 /* read reset-values */
508 if (pcan_read_canreg(priv, SJA1000_CDR) == CDR_PELICAN)
509 return 1;
510
511 return 0;
512}
513
514static int pcan_add_channels(struct pcan_pccard *card)
515{
516 struct pcmcia_device *pdev = card->pdev;
517 int i, err = 0;
518 u8 ccr = PCC_CCR_INIT;
519
520 /* init common registers (reset channels and leds off) */
521 card->ccr = ~ccr;
522 pcan_write_reg(card, PCC_CCR, ccr);
523
524 /* wait 2ms before unresetting channels */
525 usleep_range(2000, 3000);
526
527 ccr &= ~PCC_CCR_RST_ALL;
528 pcan_write_reg(card, PCC_CCR, ccr);
529
530 /* create one network device per channel detected */
531 for (i = 0; i < ARRAY_SIZE(card->channel); i++) {
532 struct net_device *netdev;
533 struct sja1000_priv *priv;
534
535 netdev = alloc_sja1000dev(0);
536 if (!netdev) {
537 err = -ENOMEM;
538 break;
539 }
540
541 /* update linkages */
542 priv = netdev_priv(netdev);
543 priv->priv = card;
544 SET_NETDEV_DEV(netdev, &pdev->dev);
545 netdev->dev_id = i;
546
547 priv->irq_flags = IRQF_SHARED;
548 netdev->irq = pdev->irq;
549 priv->reg_base = card->ioport_addr + PCC_CHAN_OFF(i);
550
551 /* check if channel is present */
552 if (!pcan_channel_present(priv)) {
553 dev_err(&pdev->dev, "channel %d not present\n", i);
554 free_sja1000dev(netdev);
555 continue;
556 }
557
558 priv->read_reg = pcan_read_canreg;
559 priv->write_reg = pcan_write_canreg;
560 priv->can.clock.freq = PCC_CAN_CLOCK;
561 priv->ocr = PCC_OCR;
562 priv->cdr = PCC_CDR;
563
564 /* Neither a slave device distributes the clock */
565 if (i > 0)
566 priv->cdr |= CDR_CLK_OFF;
567
568 priv->flags |= SJA1000_CUSTOM_IRQ_HANDLER;
569
570 /* register SJA1000 device */
571 err = register_sja1000dev(netdev);
572 if (err) {
573 free_sja1000dev(netdev);
574 continue;
575 }
576
577 card->channel[i].netdev = netdev;
578 card->chan_count++;
579
580 /* set corresponding led on in the new ccr */
581 ccr &= ~PCC_CCR_LED_OFF_CHAN(i);
582
583 dev_info(&pdev->dev,
584 "%s on channel %d at 0x%p irq %d\n",
585 netdev->name, i, priv->reg_base, pdev->irq);
586 }
587
588 /* write new ccr (change leds state) */
589 pcan_write_reg(card, PCC_CCR, ccr);
590
591 return err;
592}
593
594static int pcan_conf_check(struct pcmcia_device *pdev, void *priv_data)
595{
596 pdev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
597 pdev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8; /* only */
598 pdev->io_lines = 10;
599
600 /* This reserves IO space but doesn't actually enable it */
601 return pcmcia_request_io(pdev);
602}
603
604/*
605 * free all resources used by the device
606 */
607static void pcan_free(struct pcmcia_device *pdev)
608{
609 struct pcan_pccard *card = pdev->priv;
610
611 if (!card)
612 return;
613
614 free_irq(pdev->irq, card);
615 pcan_stop_led_timer(card);
616
617 pcan_free_channels(card);
618
619 ioport_unmap(card->ioport_addr);
620
621 kfree(card);
622 pdev->priv = NULL;
623}
624
625/*
626 * setup PCMCIA socket and probe for PEAK-System PC-CARD
627 */
628static int pcan_probe(struct pcmcia_device *pdev)
629{
630 struct pcan_pccard *card;
631 int err;
632
633 pdev->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
634
635 err = pcmcia_loop_config(pdev, pcan_conf_check, NULL);
636 if (err) {
637 dev_err(&pdev->dev, "pcmcia_loop_config() error %d\n", err);
638 goto probe_err_1;
639 }
640
641 if (!pdev->irq) {
642 dev_err(&pdev->dev, "no irq assigned\n");
643 err = -ENODEV;
644 goto probe_err_1;
645 }
646
647 err = pcmcia_enable_device(pdev);
648 if (err) {
649 dev_err(&pdev->dev, "pcmcia_enable_device failed err=%d\n",
650 err);
651 goto probe_err_1;
652 }
653
654 card = kzalloc(sizeof(struct pcan_pccard), GFP_KERNEL);
655 if (!card) {
656 err = -ENOMEM;
657 goto probe_err_2;
658 }
659
660 card->pdev = pdev;
661 pdev->priv = card;
662
663 /* sja1000 api uses iomem */
664 card->ioport_addr = ioport_map(pdev->resource[0]->start,
665 resource_size(pdev->resource[0]));
666 if (!card->ioport_addr) {
667 dev_err(&pdev->dev, "couldn't map io port into io memory\n");
668 err = -ENOMEM;
669 goto probe_err_3;
670 }
671 card->fw_major = pcan_read_reg(card, PCC_FW_MAJOR);
672 card->fw_minor = pcan_read_reg(card, PCC_FW_MINOR);
673
674 /* display board name and firware version */
675 dev_info(&pdev->dev, "PEAK-System pcmcia card %s fw %d.%d\n",
676 pdev->prod_id[1] ? pdev->prod_id[1] : "PCAN-PC Card",
677 card->fw_major, card->fw_minor);
678
679 /* detect available channels */
680 pcan_add_channels(card);
681 if (!card->chan_count) {
682 err = -ENOMEM;
683 goto probe_err_4;
684 }
685
686 /* init the timer which controls the leds */
687 timer_setup(&card->led_timer, pcan_led_timer, 0);
688
689 /* request the given irq */
690 err = request_irq(pdev->irq, &pcan_isr, IRQF_SHARED, PCC_NAME, card);
691 if (err) {
692 dev_err(&pdev->dev, "couldn't request irq%d\n", pdev->irq);
693 goto probe_err_5;
694 }
695
696 /* power on the connectors */
697 pcan_set_can_power(card, 1);
698
699 return 0;
700
701probe_err_5:
702 /* unregister can devices from network */
703 pcan_free_channels(card);
704
705probe_err_4:
706 ioport_unmap(card->ioport_addr);
707
708probe_err_3:
709 kfree(card);
710 pdev->priv = NULL;
711
712probe_err_2:
713 pcmcia_disable_device(pdev);
714
715probe_err_1:
716 return err;
717}
718
719/*
720 * release claimed resources
721 */
722static void pcan_remove(struct pcmcia_device *pdev)
723{
724 pcan_free(pdev);
725 pcmcia_disable_device(pdev);
726}
727
728static struct pcmcia_driver pcan_driver = {
729 .name = PCC_NAME,
730 .probe = pcan_probe,
731 .remove = pcan_remove,
732 .id_table = pcan_table,
733};
734module_pcmcia_driver(pcan_driver);