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2b61972b SG |
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 */ | |
06e1d1d7 | 199 | if (port == SJA1000_MOD) |
2b61972b SG |
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 */ | |
06e1d1d7 OH |
512 | pcan_write_canreg(priv, SJA1000_MOD, 1); |
513 | pcan_write_canreg(priv, SJA1000_CDR, CDR_PELICAN); | |
2b61972b SG |
514 | |
515 | /* read reset-values */ | |
06e1d1d7 | 516 | if (pcan_read_canreg(priv, SJA1000_CDR) == CDR_PELICAN) |
2b61972b SG |
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); | |
3e66d013 | 553 | netdev->dev_id = i; |
2b61972b SG |
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 | */ | |
3c8ac0f2 | 636 | static int pcan_probe(struct pcmcia_device *pdev) |
2b61972b SG |
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) { | |
2b61972b SG |
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); | |
ba9b6f9f PST |
689 | if (!card->chan_count) { |
690 | err = -ENOMEM; | |
2b61972b | 691 | goto probe_err_4; |
ba9b6f9f | 692 | } |
2b61972b SG |
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 | }; | |
fdd3f29e | 744 | module_pcmcia_driver(pcan_driver); |