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
22 MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>");
23 MODULE_DESCRIPTION("CAN driver for PEAK-System PCAN-PC Cards");
24 MODULE_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
129 struct 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 */
136 struct 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
147 static struct pcmcia_device_id pcan_table[] = {
148 PCMCIA_DEVICE_MANF_CARD(PCC_MANF_ID, PCC_CARD_ID),
149 PCMCIA_DEVICE_NULL,
150 };
151
152 MODULE_DEVICE_TABLE(pcmcia, pcan_table);
153
154 static void pcan_set_leds(struct pcan_pccard *card, u8 mask, u8 state);
155
156 /*
157 * start timer which controls leds state
158 */
pcan_start_led_timer(struct pcan_pccard * card)159 static 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 */
pcan_stop_led_timer(struct pcan_pccard * card)168 static 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 */
pcan_read_canreg(const struct sja1000_priv * priv,int port)176 static 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 */
pcan_write_canreg(const struct sja1000_priv * priv,int port,u8 v)184 static 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 */
pcan_read_reg(struct pcan_pccard * card,int port)211 static 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 */
pcan_write_reg(struct pcan_pccard * card,int port,u8 v)219 static 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 */
pcan_pccard_present(struct pcan_pccard * card)235 static 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 */
pcan_wait_spi_busy(struct pcan_pccard * card)244 static 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 */
pcan_write_eeprom(struct pcan_pccard * card,u16 addr,u8 v)262 static 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
334 we_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
pcan_set_leds(struct pcan_pccard * card,u8 led_mask,u8 state)341 static 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 */
pcan_set_can_power(struct pcan_pccard * card,int onoff)361 static 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 */
pcan_led_timer(struct timer_list * t)375 static 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 */
pcan_isr(int irq,void * dev_id)422 static 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 */
pcan_free_channels(struct pcan_pccard * card)466 static 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 */
pcan_channel_present(struct sja1000_priv * priv)500 static 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
pcan_add_channels(struct pcan_pccard * card)513 static 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
pcan_conf_check(struct pcmcia_device * pdev,void * priv_data)593 static 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 */
pcan_free(struct pcmcia_device * pdev)606 static 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 */
pcan_probe(struct pcmcia_device * pdev)627 static 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
700 probe_err_5:
701 /* unregister can devices from network */
702 pcan_free_channels(card);
703
704 probe_err_4:
705 ioport_unmap(card->ioport_addr);
706
707 probe_err_3:
708 kfree(card);
709 pdev->priv = NULL;
710
711 probe_err_2:
712 pcmcia_disable_device(pdev);
713
714 probe_err_1:
715 return err;
716 }
717
718 /*
719 * release claimed resources
720 */
pcan_remove(struct pcmcia_device * pdev)721 static void pcan_remove(struct pcmcia_device *pdev)
722 {
723 pcan_free(pdev);
724 pcmcia_disable_device(pdev);
725 }
726
727 static struct pcmcia_driver pcan_driver = {
728 .name = PCC_NAME,
729 .probe = pcan_probe,
730 .remove = pcan_remove,
731 .id_table = pcan_table,
732 };
733 module_pcmcia_driver(pcan_driver);
734