1 /*
2  * Copyright (C) 2010-2012 Stephane Grosjean <s.grosjean@peak-system.com>
3  *
4  * CAN driver for PEAK-System PCAN-PC Card
5  * Derived from the PCAN project file driver/src/pcan_pccard.c
6  * Copyright (C) 2006-2010 PEAK System-Technik GmbH
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the version 2 of the GNU General Public License
10  * as published by the Free Software Foundation
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  */
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/interrupt.h>
20 #include <linux/netdevice.h>
21 #include <linux/delay.h>
22 #include <linux/timer.h>
23 #include <linux/io.h>
24 #include <pcmcia/cistpl.h>
25 #include <pcmcia/ds.h>
26 #include <linux/can.h>
27 #include <linux/can/dev.h>
28 #include "sja1000.h"
29 
30 MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>");
31 MODULE_DESCRIPTION("CAN driver for PEAK-System PCAN-PC Cards");
32 MODULE_LICENSE("GPL v2");
33 MODULE_SUPPORTED_DEVICE("PEAK PCAN-PC Card");
34 
35 /* PEAK-System PCMCIA driver name */
36 #define PCC_NAME		"peak_pcmcia"
37 
38 #define PCC_CHAN_MAX		2
39 
40 #define PCC_CAN_CLOCK		(16000000 / 2)
41 
42 #define PCC_MANF_ID		0x0377
43 #define PCC_CARD_ID		0x0001
44 
45 #define PCC_CHAN_SIZE		0x20
46 #define PCC_CHAN_OFF(c)		((c) * PCC_CHAN_SIZE)
47 #define PCC_COMN_OFF		(PCC_CHAN_OFF(PCC_CHAN_MAX))
48 #define PCC_COMN_SIZE		0x40
49 
50 /* common area registers */
51 #define PCC_CCR			0x00
52 #define PCC_CSR			0x02
53 #define PCC_CPR			0x04
54 #define PCC_SPI_DIR		0x06
55 #define PCC_SPI_DOR		0x08
56 #define PCC_SPI_ADR		0x0a
57 #define PCC_SPI_IR		0x0c
58 #define PCC_FW_MAJOR		0x10
59 #define PCC_FW_MINOR		0x12
60 
61 /* CCR bits */
62 #define PCC_CCR_CLK_16		0x00
63 #define PCC_CCR_CLK_10		0x01
64 #define PCC_CCR_CLK_21		0x02
65 #define PCC_CCR_CLK_8		0x03
66 #define PCC_CCR_CLK_MASK	PCC_CCR_CLK_8
67 
68 #define PCC_CCR_RST_CHAN(c)	(0x01 << ((c) + 2))
69 #define PCC_CCR_RST_ALL		(PCC_CCR_RST_CHAN(0) | PCC_CCR_RST_CHAN(1))
70 #define PCC_CCR_RST_MASK	PCC_CCR_RST_ALL
71 
72 /* led selection bits */
73 #define PCC_LED(c)		(1 << (c))
74 #define PCC_LED_ALL		(PCC_LED(0) | PCC_LED(1))
75 
76 /* led state value */
77 #define PCC_LED_ON		0x00
78 #define PCC_LED_FAST		0x01
79 #define PCC_LED_SLOW		0x02
80 #define PCC_LED_OFF		0x03
81 
82 #define PCC_CCR_LED_CHAN(s, c)	((s) << (((c) + 2) << 1))
83 
84 #define PCC_CCR_LED_ON_CHAN(c)		PCC_CCR_LED_CHAN(PCC_LED_ON, c)
85 #define PCC_CCR_LED_FAST_CHAN(c)	PCC_CCR_LED_CHAN(PCC_LED_FAST, c)
86 #define PCC_CCR_LED_SLOW_CHAN(c)	PCC_CCR_LED_CHAN(PCC_LED_SLOW, c)
87 #define PCC_CCR_LED_OFF_CHAN(c)		PCC_CCR_LED_CHAN(PCC_LED_OFF, c)
88 #define PCC_CCR_LED_MASK_CHAN(c)	PCC_CCR_LED_OFF_CHAN(c)
89 #define PCC_CCR_LED_OFF_ALL		(PCC_CCR_LED_OFF_CHAN(0) | \
90 					 PCC_CCR_LED_OFF_CHAN(1))
91 #define PCC_CCR_LED_MASK		PCC_CCR_LED_OFF_ALL
92 
93 #define PCC_CCR_INIT	(PCC_CCR_CLK_16 | PCC_CCR_RST_ALL | PCC_CCR_LED_OFF_ALL)
94 
95 /* CSR bits */
96 #define PCC_CSR_SPI_BUSY		0x04
97 
98 /* time waiting for SPI busy (prevent from infinite loop) */
99 #define PCC_SPI_MAX_BUSY_WAIT_MS	3
100 
101 /* max count of reading the SPI status register waiting for a change */
102 /* (prevent from infinite loop) */
103 #define PCC_WRITE_MAX_LOOP		1000
104 
105 /* max nb of int handled by that isr in one shot (prevent from infinite loop) */
106 #define PCC_ISR_MAX_LOOP		10
107 
108 /* EEPROM chip instruction set */
109 /* note: EEPROM Read/Write instructions include A8 bit */
110 #define PCC_EEP_WRITE(a)	(0x02 | (((a) & 0x100) >> 5))
111 #define PCC_EEP_READ(a)		(0x03 | (((a) & 0x100) >> 5))
112 #define PCC_EEP_WRDI		0x04	/* EEPROM Write Disable */
113 #define PCC_EEP_RDSR		0x05	/* EEPROM Read Status Register */
114 #define PCC_EEP_WREN		0x06	/* EEPROM Write Enable */
115 
116 /* EEPROM Status Register bits */
117 #define PCC_EEP_SR_WEN		0x02	/* EEPROM SR Write Enable bit */
118 #define PCC_EEP_SR_WIP		0x01	/* EEPROM SR Write In Progress bit */
119 
120 /*
121  * The board configuration is probably following:
122  * RX1 is connected to ground.
123  * TX1 is not connected.
124  * CLKO is not connected.
125  * Setting the OCR register to 0xDA is a good idea.
126  * This means normal output mode, push-pull and the correct polarity.
127  */
128 #define PCC_OCR			(OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)
129 
130 /*
131  * In the CDR register, you should set CBP to 1.
132  * You will probably also want to set the clock divider value to 7
133  * (meaning direct oscillator output) because the second SJA1000 chip
134  * is driven by the first one CLKOUT output.
135  */
136 #define PCC_CDR			(CDR_CBP | CDR_CLKOUT_MASK)
137 
138 struct pcan_channel {
139 	struct net_device *netdev;
140 	unsigned long prev_rx_bytes;
141 	unsigned long prev_tx_bytes;
142 };
143 
144 /* PCAN-PC Card private structure */
145 struct pcan_pccard {
146 	struct pcmcia_device *pdev;
147 	int chan_count;
148 	struct pcan_channel channel[PCC_CHAN_MAX];
149 	u8 ccr;
150 	u8 fw_major;
151 	u8 fw_minor;
152 	void __iomem *ioport_addr;
153 	struct timer_list led_timer;
154 };
155 
156 static struct pcmcia_device_id pcan_table[] = {
157 	PCMCIA_DEVICE_MANF_CARD(PCC_MANF_ID, PCC_CARD_ID),
158 	PCMCIA_DEVICE_NULL,
159 };
160 
161 MODULE_DEVICE_TABLE(pcmcia, pcan_table);
162 
163 static void pcan_set_leds(struct pcan_pccard *card, u8 mask, u8 state);
164 
165 /*
166  * start timer which controls leds state
167  */
168 static void pcan_start_led_timer(struct pcan_pccard *card)
169 {
170 	if (!timer_pending(&card->led_timer))
171 		mod_timer(&card->led_timer, jiffies + HZ);
172 }
173 
174 /*
175  * stop the timer which controls leds state
176  */
177 static void pcan_stop_led_timer(struct pcan_pccard *card)
178 {
179 	del_timer_sync(&card->led_timer);
180 }
181 
182 /*
183  * read a sja1000 register
184  */
185 static u8 pcan_read_canreg(const struct sja1000_priv *priv, int port)
186 {
187 	return ioread8(priv->reg_base + port);
188 }
189 
190 /*
191  * write a sja1000 register
192  */
193 static void pcan_write_canreg(const struct sja1000_priv *priv, int port, u8 v)
194 {
195 	struct pcan_pccard *card = priv->priv;
196 	int c = (priv->reg_base - card->ioport_addr) / PCC_CHAN_SIZE;
197 
198 	/* sja1000 register changes control the leds state */
199 	if (port == SJA1000_MOD)
200 		switch (v) {
201 		case MOD_RM:
202 			/* Reset Mode: set led on */
203 			pcan_set_leds(card, PCC_LED(c), PCC_LED_ON);
204 			break;
205 		case 0x00:
206 			/* Normal Mode: led slow blinking and start led timer */
207 			pcan_set_leds(card, PCC_LED(c), PCC_LED_SLOW);
208 			pcan_start_led_timer(card);
209 			break;
210 		default:
211 			break;
212 		}
213 
214 	iowrite8(v, priv->reg_base + port);
215 }
216 
217 /*
218  * read a register from the common area
219  */
220 static u8 pcan_read_reg(struct pcan_pccard *card, int port)
221 {
222 	return ioread8(card->ioport_addr + PCC_COMN_OFF + port);
223 }
224 
225 /*
226  * write a register into the common area
227  */
228 static void pcan_write_reg(struct pcan_pccard *card, int port, u8 v)
229 {
230 	/* cache ccr value */
231 	if (port == PCC_CCR) {
232 		if (card->ccr == v)
233 			return;
234 		card->ccr = v;
235 	}
236 
237 	iowrite8(v, card->ioport_addr + PCC_COMN_OFF + port);
238 }
239 
240 /*
241  * check whether the card is present by checking its fw version numbers
242  * against values read at probing time.
243  */
244 static inline int pcan_pccard_present(struct pcan_pccard *card)
245 {
246 	return ((pcan_read_reg(card, PCC_FW_MAJOR) == card->fw_major) &&
247 		(pcan_read_reg(card, PCC_FW_MINOR) == card->fw_minor));
248 }
249 
250 /*
251  * wait for SPI engine while it is busy
252  */
253 static int pcan_wait_spi_busy(struct pcan_pccard *card)
254 {
255 	unsigned long timeout = jiffies +
256 				msecs_to_jiffies(PCC_SPI_MAX_BUSY_WAIT_MS) + 1;
257 
258 	/* be sure to read status at least once after sleeping */
259 	while (pcan_read_reg(card, PCC_CSR) & PCC_CSR_SPI_BUSY) {
260 		if (time_after(jiffies, timeout))
261 			return -EBUSY;
262 		schedule();
263 	}
264 
265 	return 0;
266 }
267 
268 /*
269  * write data in device eeprom
270  */
271 static int pcan_write_eeprom(struct pcan_pccard *card, u16 addr, u8 v)
272 {
273 	u8 status;
274 	int err, i;
275 
276 	/* write instruction enabling write */
277 	pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WREN);
278 	err = pcan_wait_spi_busy(card);
279 	if (err)
280 		goto we_spi_err;
281 
282 	/* wait until write enabled */
283 	for (i = 0; i < PCC_WRITE_MAX_LOOP; i++) {
284 		/* write instruction reading the status register */
285 		pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_RDSR);
286 		err = pcan_wait_spi_busy(card);
287 		if (err)
288 			goto we_spi_err;
289 
290 		/* get status register value and check write enable bit */
291 		status = pcan_read_reg(card, PCC_SPI_DIR);
292 		if (status & PCC_EEP_SR_WEN)
293 			break;
294 	}
295 
296 	if (i >= PCC_WRITE_MAX_LOOP) {
297 		dev_err(&card->pdev->dev,
298 			"stop waiting to be allowed to write in eeprom\n");
299 		return -EIO;
300 	}
301 
302 	/* set address and data */
303 	pcan_write_reg(card, PCC_SPI_ADR, addr & 0xff);
304 	pcan_write_reg(card, PCC_SPI_DOR, v);
305 
306 	/*
307 	 * write instruction with bit[3] set according to address value:
308 	 * if addr refers to upper half of the memory array: bit[3] = 1
309 	 */
310 	pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WRITE(addr));
311 	err = pcan_wait_spi_busy(card);
312 	if (err)
313 		goto we_spi_err;
314 
315 	/* wait while write in progress */
316 	for (i = 0; i < PCC_WRITE_MAX_LOOP; i++) {
317 		/* write instruction reading the status register */
318 		pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_RDSR);
319 		err = pcan_wait_spi_busy(card);
320 		if (err)
321 			goto we_spi_err;
322 
323 		/* get status register value and check write in progress bit */
324 		status = pcan_read_reg(card, PCC_SPI_DIR);
325 		if (!(status & PCC_EEP_SR_WIP))
326 			break;
327 	}
328 
329 	if (i >= PCC_WRITE_MAX_LOOP) {
330 		dev_err(&card->pdev->dev,
331 			"stop waiting for write in eeprom to complete\n");
332 		return -EIO;
333 	}
334 
335 	/* write instruction disabling write */
336 	pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WRDI);
337 	err = pcan_wait_spi_busy(card);
338 	if (err)
339 		goto we_spi_err;
340 
341 	return 0;
342 
343 we_spi_err:
344 	dev_err(&card->pdev->dev,
345 		"stop waiting (spi engine always busy) err %d\n", err);
346 
347 	return err;
348 }
349 
350 static void pcan_set_leds(struct pcan_pccard *card, u8 led_mask, u8 state)
351 {
352 	u8 ccr = card->ccr;
353 	int i;
354 
355 	for (i = 0; i < card->chan_count; i++)
356 		if (led_mask & PCC_LED(i)) {
357 			/* clear corresponding led bits in ccr */
358 			ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
359 			/* then set new bits */
360 			ccr |= PCC_CCR_LED_CHAN(state, i);
361 		}
362 
363 	/* real write only if something has changed in ccr */
364 	pcan_write_reg(card, PCC_CCR, ccr);
365 }
366 
367 /*
368  * enable/disable CAN connectors power
369  */
370 static inline void pcan_set_can_power(struct pcan_pccard *card, int onoff)
371 {
372 	int err;
373 
374 	err = pcan_write_eeprom(card, 0, !!onoff);
375 	if (err)
376 		dev_err(&card->pdev->dev,
377 			"failed setting power %s to can connectors (err %d)\n",
378 			(onoff) ? "on" : "off", err);
379 }
380 
381 /*
382  * set leds state according to channel activity
383  */
384 static void pcan_led_timer(unsigned long arg)
385 {
386 	struct pcan_pccard *card = (struct pcan_pccard *)arg;
387 	struct net_device *netdev;
388 	int i, up_count = 0;
389 	u8 ccr;
390 
391 	ccr = card->ccr;
392 	for (i = 0; i < card->chan_count; i++) {
393 		/* default is: not configured */
394 		ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
395 		ccr |= PCC_CCR_LED_ON_CHAN(i);
396 
397 		netdev = card->channel[i].netdev;
398 		if (!netdev || !(netdev->flags & IFF_UP))
399 			continue;
400 
401 		up_count++;
402 
403 		/* no activity (but configured) */
404 		ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
405 		ccr |= PCC_CCR_LED_SLOW_CHAN(i);
406 
407 		/* if bytes counters changed, set fast blinking led */
408 		if (netdev->stats.rx_bytes != card->channel[i].prev_rx_bytes) {
409 			card->channel[i].prev_rx_bytes = netdev->stats.rx_bytes;
410 			ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
411 			ccr |= PCC_CCR_LED_FAST_CHAN(i);
412 		}
413 		if (netdev->stats.tx_bytes != card->channel[i].prev_tx_bytes) {
414 			card->channel[i].prev_tx_bytes = netdev->stats.tx_bytes;
415 			ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
416 			ccr |= PCC_CCR_LED_FAST_CHAN(i);
417 		}
418 	}
419 
420 	/* write the new leds state */
421 	pcan_write_reg(card, PCC_CCR, ccr);
422 
423 	/* restart timer (except if no more configured channels) */
424 	if (up_count)
425 		mod_timer(&card->led_timer, jiffies + HZ);
426 }
427 
428 /*
429  * interrupt service routine
430  */
431 static irqreturn_t pcan_isr(int irq, void *dev_id)
432 {
433 	struct pcan_pccard *card = dev_id;
434 	int irq_handled;
435 
436 	/* prevent from infinite loop */
437 	for (irq_handled = 0; irq_handled < PCC_ISR_MAX_LOOP; irq_handled++) {
438 		/* handle shared interrupt and next loop */
439 		int nothing_to_handle = 1;
440 		int i;
441 
442 		/* check interrupt for each channel */
443 		for (i = 0; i < card->chan_count; i++) {
444 			struct net_device *netdev;
445 
446 			/*
447 			 * check whether the card is present before calling
448 			 * sja1000_interrupt() to speed up hotplug detection
449 			 */
450 			if (!pcan_pccard_present(card)) {
451 				/* card unplugged during isr */
452 				return IRQ_NONE;
453 			}
454 
455 			/*
456 			 * should check whether all or SJA1000_MAX_IRQ
457 			 * interrupts have been handled: loop again to be sure.
458 			 */
459 			netdev = card->channel[i].netdev;
460 			if (netdev &&
461 			    sja1000_interrupt(irq, netdev) == IRQ_HANDLED)
462 				nothing_to_handle = 0;
463 		}
464 
465 		if (nothing_to_handle)
466 			break;
467 	}
468 
469 	return (irq_handled) ? IRQ_HANDLED : IRQ_NONE;
470 }
471 
472 /*
473  * free all resources used by the channels and switch off leds and can power
474  */
475 static void pcan_free_channels(struct pcan_pccard *card)
476 {
477 	int i;
478 	u8 led_mask = 0;
479 
480 	for (i = 0; i < card->chan_count; i++) {
481 		struct net_device *netdev;
482 		char name[IFNAMSIZ];
483 
484 		led_mask |= PCC_LED(i);
485 
486 		netdev = card->channel[i].netdev;
487 		if (!netdev)
488 			continue;
489 
490 		strncpy(name, netdev->name, IFNAMSIZ);
491 
492 		unregister_sja1000dev(netdev);
493 
494 		free_sja1000dev(netdev);
495 
496 		dev_info(&card->pdev->dev, "%s removed\n", name);
497 	}
498 
499 	/* do it only if device not removed */
500 	if (pcan_pccard_present(card)) {
501 		pcan_set_leds(card, led_mask, PCC_LED_OFF);
502 		pcan_set_can_power(card, 0);
503 	}
504 }
505 
506 /*
507  * check if a CAN controller is present at the specified location
508  */
509 static inline int pcan_channel_present(struct sja1000_priv *priv)
510 {
511 	/* make sure SJA1000 is in reset mode */
512 	pcan_write_canreg(priv, SJA1000_MOD, 1);
513 	pcan_write_canreg(priv, SJA1000_CDR, CDR_PELICAN);
514 
515 	/* read reset-values */
516 	if (pcan_read_canreg(priv, SJA1000_CDR) == CDR_PELICAN)
517 		return 1;
518 
519 	return 0;
520 }
521 
522 static int pcan_add_channels(struct pcan_pccard *card)
523 {
524 	struct pcmcia_device *pdev = card->pdev;
525 	int i, err = 0;
526 	u8 ccr = PCC_CCR_INIT;
527 
528 	/* init common registers (reset channels and leds off) */
529 	card->ccr = ~ccr;
530 	pcan_write_reg(card, PCC_CCR, ccr);
531 
532 	/* wait 2ms before unresetting channels */
533 	mdelay(2);
534 
535 	ccr &= ~PCC_CCR_RST_ALL;
536 	pcan_write_reg(card, PCC_CCR, ccr);
537 
538 	/* create one network device per channel detected */
539 	for (i = 0; i < ARRAY_SIZE(card->channel); i++) {
540 		struct net_device *netdev;
541 		struct sja1000_priv *priv;
542 
543 		netdev = alloc_sja1000dev(0);
544 		if (!netdev) {
545 			err = -ENOMEM;
546 			break;
547 		}
548 
549 		/* update linkages */
550 		priv = netdev_priv(netdev);
551 		priv->priv = card;
552 		SET_NETDEV_DEV(netdev, &pdev->dev);
553 		netdev->dev_id = i;
554 
555 		priv->irq_flags = IRQF_SHARED;
556 		netdev->irq = pdev->irq;
557 		priv->reg_base = card->ioport_addr + PCC_CHAN_OFF(i);
558 
559 		/* check if channel is present */
560 		if (!pcan_channel_present(priv)) {
561 			dev_err(&pdev->dev, "channel %d not present\n", i);
562 			free_sja1000dev(netdev);
563 			continue;
564 		}
565 
566 		priv->read_reg  = pcan_read_canreg;
567 		priv->write_reg = pcan_write_canreg;
568 		priv->can.clock.freq = PCC_CAN_CLOCK;
569 		priv->ocr = PCC_OCR;
570 		priv->cdr = PCC_CDR;
571 
572 		/* Neither a slave device distributes the clock */
573 		if (i > 0)
574 			priv->cdr |= CDR_CLK_OFF;
575 
576 		priv->flags |= SJA1000_CUSTOM_IRQ_HANDLER;
577 
578 		/* register SJA1000 device */
579 		err = register_sja1000dev(netdev);
580 		if (err) {
581 			free_sja1000dev(netdev);
582 			continue;
583 		}
584 
585 		card->channel[i].netdev = netdev;
586 		card->chan_count++;
587 
588 		/* set corresponding led on in the new ccr */
589 		ccr &= ~PCC_CCR_LED_OFF_CHAN(i);
590 
591 		dev_info(&pdev->dev,
592 			"%s on channel %d at 0x%p irq %d\n",
593 			netdev->name, i, priv->reg_base, pdev->irq);
594 	}
595 
596 	/* write new ccr (change leds state) */
597 	pcan_write_reg(card, PCC_CCR, ccr);
598 
599 	return err;
600 }
601 
602 static int pcan_conf_check(struct pcmcia_device *pdev, void *priv_data)
603 {
604 	pdev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
605 	pdev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8; /* only */
606 	pdev->io_lines = 10;
607 
608 	/* This reserves IO space but doesn't actually enable it */
609 	return pcmcia_request_io(pdev);
610 }
611 
612 /*
613  * free all resources used by the device
614  */
615 static void pcan_free(struct pcmcia_device *pdev)
616 {
617 	struct pcan_pccard *card = pdev->priv;
618 
619 	if (!card)
620 		return;
621 
622 	free_irq(pdev->irq, card);
623 	pcan_stop_led_timer(card);
624 
625 	pcan_free_channels(card);
626 
627 	ioport_unmap(card->ioport_addr);
628 
629 	kfree(card);
630 	pdev->priv = NULL;
631 }
632 
633 /*
634  * setup PCMCIA socket and probe for PEAK-System PC-CARD
635  */
636 static int pcan_probe(struct pcmcia_device *pdev)
637 {
638 	struct pcan_pccard *card;
639 	int err;
640 
641 	pdev->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
642 
643 	err = pcmcia_loop_config(pdev, pcan_conf_check, NULL);
644 	if (err) {
645 		dev_err(&pdev->dev, "pcmcia_loop_config() error %d\n", err);
646 		goto probe_err_1;
647 	}
648 
649 	if (!pdev->irq) {
650 		dev_err(&pdev->dev, "no irq assigned\n");
651 		err = -ENODEV;
652 		goto probe_err_1;
653 	}
654 
655 	err = pcmcia_enable_device(pdev);
656 	if (err) {
657 		dev_err(&pdev->dev, "pcmcia_enable_device failed err=%d\n",
658 			err);
659 		goto probe_err_1;
660 	}
661 
662 	card = kzalloc(sizeof(struct pcan_pccard), GFP_KERNEL);
663 	if (!card) {
664 		err = -ENOMEM;
665 		goto probe_err_2;
666 	}
667 
668 	card->pdev = pdev;
669 	pdev->priv = card;
670 
671 	/* sja1000 api uses iomem */
672 	card->ioport_addr = ioport_map(pdev->resource[0]->start,
673 					resource_size(pdev->resource[0]));
674 	if (!card->ioport_addr) {
675 		dev_err(&pdev->dev, "couldn't map io port into io memory\n");
676 		err = -ENOMEM;
677 		goto probe_err_3;
678 	}
679 	card->fw_major = pcan_read_reg(card, PCC_FW_MAJOR);
680 	card->fw_minor = pcan_read_reg(card, PCC_FW_MINOR);
681 
682 	/* display board name and firware version */
683 	dev_info(&pdev->dev, "PEAK-System pcmcia card %s fw %d.%d\n",
684 		pdev->prod_id[1] ? pdev->prod_id[1] : "PCAN-PC Card",
685 		card->fw_major, card->fw_minor);
686 
687 	/* detect available channels */
688 	pcan_add_channels(card);
689 	if (!card->chan_count) {
690 		err = -ENOMEM;
691 		goto probe_err_4;
692 	}
693 
694 	/* init the timer which controls the leds */
695 	init_timer(&card->led_timer);
696 	card->led_timer.function = pcan_led_timer;
697 	card->led_timer.data = (unsigned long)card;
698 
699 	/* request the given irq */
700 	err = request_irq(pdev->irq, &pcan_isr, IRQF_SHARED, PCC_NAME, card);
701 	if (err) {
702 		dev_err(&pdev->dev, "couldn't request irq%d\n", pdev->irq);
703 		goto probe_err_5;
704 	}
705 
706 	/* power on the connectors */
707 	pcan_set_can_power(card, 1);
708 
709 	return 0;
710 
711 probe_err_5:
712 	/* unregister can devices from network */
713 	pcan_free_channels(card);
714 
715 probe_err_4:
716 	ioport_unmap(card->ioport_addr);
717 
718 probe_err_3:
719 	kfree(card);
720 	pdev->priv = NULL;
721 
722 probe_err_2:
723 	pcmcia_disable_device(pdev);
724 
725 probe_err_1:
726 	return err;
727 }
728 
729 /*
730  * release claimed resources
731  */
732 static void pcan_remove(struct pcmcia_device *pdev)
733 {
734 	pcan_free(pdev);
735 	pcmcia_disable_device(pdev);
736 }
737 
738 static struct pcmcia_driver pcan_driver = {
739 	.name = PCC_NAME,
740 	.probe = pcan_probe,
741 	.remove = pcan_remove,
742 	.id_table = pcan_table,
743 };
744 module_pcmcia_driver(pcan_driver);
745