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 | */ |
159 | static void pcan_start_led_timer(struct pcan_pccard *card) |
160 | { |
161 | if (!timer_pending(timer: &card->led_timer)) |
162 | mod_timer(timer: &card->led_timer, expires: jiffies + HZ); |
163 | } |
164 | |
165 | /* |
166 | * stop the timer which controls leds state |
167 | */ |
168 | static void pcan_stop_led_timer(struct pcan_pccard *card) |
169 | { |
170 | del_timer_sync(timer: &card->led_timer); |
171 | } |
172 | |
173 | /* |
174 | * read a sja1000 register |
175 | */ |
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 | */ |
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 | */ |
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 | */ |
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 | */ |
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 | */ |
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 | */ |
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, v: 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 | |
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, v: ccr); |
356 | } |
357 | |
358 | /* |
359 | * enable/disable CAN connectors power |
360 | */ |
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, addr: 0, v: !!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 | */ |
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, v: ccr); |
413 | |
414 | /* restart timer (except if no more configured channels) */ |
415 | if (up_count) |
416 | mod_timer(timer: &card->led_timer, expires: jiffies + HZ); |
417 | } |
418 | |
419 | /* |
420 | * interrupt service routine |
421 | */ |
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, dev_id: 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 | */ |
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(p: name, q: netdev->name, IFNAMSIZ); |
482 | |
483 | unregister_sja1000dev(dev: netdev); |
484 | |
485 | free_sja1000dev(dev: 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, onoff: 0); |
494 | } |
495 | } |
496 | |
497 | /* |
498 | * check if a CAN controller is present at the specified location |
499 | */ |
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, v: 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 | |
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, v: ccr); |
522 | |
523 | /* wait 2ms before unresetting channels */ |
524 | usleep_range(min: 2000, max: 3000); |
525 | |
526 | ccr &= ~PCC_CCR_RST_ALL; |
527 | pcan_write_reg(card, PCC_CCR, v: 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(sizeof_priv: 0); |
535 | if (!netdev) { |
536 | err = -ENOMEM; |
537 | break; |
538 | } |
539 | |
540 | /* update linkages */ |
541 | priv = netdev_priv(dev: 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(dev: 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(dev: netdev); |
571 | if (err) { |
572 | free_sja1000dev(dev: 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, v: ccr); |
589 | |
590 | return err; |
591 | } |
592 | |
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(p_dev: pdev); |
601 | } |
602 | |
603 | /* |
604 | * free all resources used by the device |
605 | */ |
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(p: card->ioport_addr); |
619 | |
620 | kfree(objp: card); |
621 | pdev->priv = NULL; |
622 | } |
623 | |
624 | /* |
625 | * setup PCMCIA socket and probe for PEAK-System PC-CARD |
626 | */ |
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(p_dev: pdev, conf_check: 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(p_dev: 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(size: 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(port: pdev->resource[0]->start, |
664 | nr: resource_size(res: 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(irq: pdev->irq, handler: &pcan_isr, IRQF_SHARED, PCC_NAME, dev: 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, onoff: 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(p: card->ioport_addr); |
706 | |
707 | probe_err_3: |
708 | kfree(objp: card); |
709 | pdev->priv = NULL; |
710 | |
711 | probe_err_2: |
712 | pcmcia_disable_device(p_dev: pdev); |
713 | |
714 | probe_err_1: |
715 | return err; |
716 | } |
717 | |
718 | /* |
719 | * release claimed resources |
720 | */ |
721 | static void pcan_remove(struct pcmcia_device *pdev) |
722 | { |
723 | pcan_free(pdev); |
724 | pcmcia_disable_device(p_dev: 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 | |