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429da1cc WG |
1 | /* |
2 | * sja1000.c - Philips SJA1000 network device driver | |
3 | * | |
4 | * Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33, | |
5 | * 38106 Braunschweig, GERMANY | |
6 | * | |
7 | * Copyright (c) 2002-2007 Volkswagen Group Electronic Research | |
8 | * All rights reserved. | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * 1. Redistributions of source code must retain the above copyright | |
14 | * notice, this list of conditions and the following disclaimer. | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in the | |
17 | * documentation and/or other materials provided with the distribution. | |
18 | * 3. Neither the name of Volkswagen nor the names of its contributors | |
19 | * may be used to endorse or promote products derived from this software | |
20 | * without specific prior written permission. | |
21 | * | |
22 | * Alternatively, provided that this notice is retained in full, this | |
23 | * software may be distributed under the terms of the GNU General | |
24 | * Public License ("GPL") version 2, in which case the provisions of the | |
25 | * GPL apply INSTEAD OF those given above. | |
26 | * | |
27 | * The provided data structures and external interfaces from this code | |
28 | * are not restricted to be used by modules with a GPL compatible license. | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
31 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
32 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
33 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
34 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
35 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
36 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
37 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
38 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
39 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
40 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH | |
41 | * DAMAGE. | |
42 | * | |
43 | * Send feedback to <socketcan-users@lists.berlios.de> | |
44 | * | |
45 | */ | |
46 | ||
47 | #include <linux/module.h> | |
48 | #include <linux/init.h> | |
49 | #include <linux/kernel.h> | |
50 | #include <linux/sched.h> | |
51 | #include <linux/types.h> | |
52 | #include <linux/fcntl.h> | |
53 | #include <linux/interrupt.h> | |
54 | #include <linux/ptrace.h> | |
55 | #include <linux/string.h> | |
56 | #include <linux/errno.h> | |
57 | #include <linux/netdevice.h> | |
58 | #include <linux/if_arp.h> | |
59 | #include <linux/if_ether.h> | |
60 | #include <linux/skbuff.h> | |
61 | #include <linux/delay.h> | |
62 | ||
63 | #include <linux/can.h> | |
64 | #include <linux/can/dev.h> | |
65 | #include <linux/can/error.h> | |
66 | #include <linux/can/dev.h> | |
67 | ||
68 | #include "sja1000.h" | |
69 | ||
70 | #define DRV_NAME "sja1000" | |
71 | ||
72 | MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>"); | |
73 | MODULE_LICENSE("Dual BSD/GPL"); | |
74 | MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver"); | |
75 | ||
76 | static struct can_bittiming_const sja1000_bittiming_const = { | |
77 | .name = DRV_NAME, | |
78 | .tseg1_min = 1, | |
79 | .tseg1_max = 16, | |
80 | .tseg2_min = 1, | |
81 | .tseg2_max = 8, | |
82 | .sjw_max = 4, | |
83 | .brp_min = 1, | |
84 | .brp_max = 64, | |
85 | .brp_inc = 1, | |
86 | }; | |
87 | ||
88 | static int sja1000_probe_chip(struct net_device *dev) | |
89 | { | |
90 | struct sja1000_priv *priv = netdev_priv(dev); | |
91 | ||
255a9154 | 92 | if (priv->reg_base && (priv->read_reg(priv, 0) == 0xFF)) { |
429da1cc WG |
93 | printk(KERN_INFO "%s: probing @0x%lX failed\n", |
94 | DRV_NAME, dev->base_addr); | |
95 | return 0; | |
96 | } | |
97 | return -1; | |
98 | } | |
99 | ||
100 | static void set_reset_mode(struct net_device *dev) | |
101 | { | |
102 | struct sja1000_priv *priv = netdev_priv(dev); | |
255a9154 | 103 | unsigned char status = priv->read_reg(priv, REG_MOD); |
429da1cc WG |
104 | int i; |
105 | ||
106 | /* disable interrupts */ | |
255a9154 | 107 | priv->write_reg(priv, REG_IER, IRQ_OFF); |
429da1cc WG |
108 | |
109 | for (i = 0; i < 100; i++) { | |
110 | /* check reset bit */ | |
111 | if (status & MOD_RM) { | |
112 | priv->can.state = CAN_STATE_STOPPED; | |
113 | return; | |
114 | } | |
115 | ||
255a9154 | 116 | priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */ |
429da1cc | 117 | udelay(10); |
255a9154 | 118 | status = priv->read_reg(priv, REG_MOD); |
429da1cc WG |
119 | } |
120 | ||
121 | dev_err(dev->dev.parent, "setting SJA1000 into reset mode failed!\n"); | |
122 | } | |
123 | ||
124 | static void set_normal_mode(struct net_device *dev) | |
125 | { | |
126 | struct sja1000_priv *priv = netdev_priv(dev); | |
255a9154 | 127 | unsigned char status = priv->read_reg(priv, REG_MOD); |
429da1cc WG |
128 | int i; |
129 | ||
130 | for (i = 0; i < 100; i++) { | |
131 | /* check reset bit */ | |
132 | if ((status & MOD_RM) == 0) { | |
133 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
134 | /* enable all interrupts */ | |
255a9154 | 135 | priv->write_reg(priv, REG_IER, IRQ_ALL); |
429da1cc WG |
136 | return; |
137 | } | |
138 | ||
139 | /* set chip to normal mode */ | |
255a9154 | 140 | priv->write_reg(priv, REG_MOD, 0x00); |
429da1cc | 141 | udelay(10); |
255a9154 | 142 | status = priv->read_reg(priv, REG_MOD); |
429da1cc WG |
143 | } |
144 | ||
145 | dev_err(dev->dev.parent, "setting SJA1000 into normal mode failed!\n"); | |
146 | } | |
147 | ||
148 | static void sja1000_start(struct net_device *dev) | |
149 | { | |
150 | struct sja1000_priv *priv = netdev_priv(dev); | |
151 | ||
152 | /* leave reset mode */ | |
153 | if (priv->can.state != CAN_STATE_STOPPED) | |
154 | set_reset_mode(dev); | |
155 | ||
156 | /* Clear error counters and error code capture */ | |
255a9154 WG |
157 | priv->write_reg(priv, REG_TXERR, 0x0); |
158 | priv->write_reg(priv, REG_RXERR, 0x0); | |
159 | priv->read_reg(priv, REG_ECC); | |
429da1cc WG |
160 | |
161 | /* leave reset mode */ | |
162 | set_normal_mode(dev); | |
163 | } | |
164 | ||
165 | static int sja1000_set_mode(struct net_device *dev, enum can_mode mode) | |
166 | { | |
167 | struct sja1000_priv *priv = netdev_priv(dev); | |
168 | ||
169 | if (!priv->open_time) | |
170 | return -EINVAL; | |
171 | ||
172 | switch (mode) { | |
173 | case CAN_MODE_START: | |
174 | sja1000_start(dev); | |
175 | if (netif_queue_stopped(dev)) | |
176 | netif_wake_queue(dev); | |
177 | break; | |
178 | ||
179 | default: | |
180 | return -EOPNOTSUPP; | |
181 | } | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | static int sja1000_set_bittiming(struct net_device *dev) | |
187 | { | |
188 | struct sja1000_priv *priv = netdev_priv(dev); | |
189 | struct can_bittiming *bt = &priv->can.bittiming; | |
190 | u8 btr0, btr1; | |
191 | ||
192 | btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); | |
193 | btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | | |
194 | (((bt->phase_seg2 - 1) & 0x7) << 4); | |
195 | if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) | |
196 | btr1 |= 0x80; | |
197 | ||
198 | dev_info(dev->dev.parent, | |
199 | "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); | |
200 | ||
255a9154 WG |
201 | priv->write_reg(priv, REG_BTR0, btr0); |
202 | priv->write_reg(priv, REG_BTR1, btr1); | |
429da1cc WG |
203 | |
204 | return 0; | |
205 | } | |
206 | ||
207 | /* | |
208 | * initialize SJA1000 chip: | |
209 | * - reset chip | |
210 | * - set output mode | |
211 | * - set baudrate | |
212 | * - enable interrupts | |
213 | * - start operating mode | |
214 | */ | |
215 | static void chipset_init(struct net_device *dev) | |
216 | { | |
217 | struct sja1000_priv *priv = netdev_priv(dev); | |
218 | ||
219 | /* set clock divider and output control register */ | |
255a9154 | 220 | priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN); |
429da1cc WG |
221 | |
222 | /* set acceptance filter (accept all) */ | |
255a9154 WG |
223 | priv->write_reg(priv, REG_ACCC0, 0x00); |
224 | priv->write_reg(priv, REG_ACCC1, 0x00); | |
225 | priv->write_reg(priv, REG_ACCC2, 0x00); | |
226 | priv->write_reg(priv, REG_ACCC3, 0x00); | |
429da1cc | 227 | |
255a9154 WG |
228 | priv->write_reg(priv, REG_ACCM0, 0xFF); |
229 | priv->write_reg(priv, REG_ACCM1, 0xFF); | |
230 | priv->write_reg(priv, REG_ACCM2, 0xFF); | |
231 | priv->write_reg(priv, REG_ACCM3, 0xFF); | |
429da1cc | 232 | |
255a9154 | 233 | priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL); |
429da1cc WG |
234 | } |
235 | ||
236 | /* | |
237 | * transmit a CAN message | |
238 | * message layout in the sk_buff should be like this: | |
239 | * xx xx xx xx ff ll 00 11 22 33 44 55 66 77 | |
240 | * [ can-id ] [flags] [len] [can data (up to 8 bytes] | |
241 | */ | |
242 | static int sja1000_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
243 | { | |
244 | struct sja1000_priv *priv = netdev_priv(dev); | |
245 | struct net_device_stats *stats = &dev->stats; | |
246 | struct can_frame *cf = (struct can_frame *)skb->data; | |
247 | uint8_t fi; | |
248 | uint8_t dlc; | |
249 | canid_t id; | |
250 | uint8_t dreg; | |
251 | int i; | |
252 | ||
253 | netif_stop_queue(dev); | |
254 | ||
255 | fi = dlc = cf->can_dlc; | |
256 | id = cf->can_id; | |
257 | ||
258 | if (id & CAN_RTR_FLAG) | |
259 | fi |= FI_RTR; | |
260 | ||
261 | if (id & CAN_EFF_FLAG) { | |
262 | fi |= FI_FF; | |
263 | dreg = EFF_BUF; | |
255a9154 WG |
264 | priv->write_reg(priv, REG_FI, fi); |
265 | priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16)); | |
266 | priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8)); | |
267 | priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5); | |
268 | priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3); | |
429da1cc WG |
269 | } else { |
270 | dreg = SFF_BUF; | |
255a9154 WG |
271 | priv->write_reg(priv, REG_FI, fi); |
272 | priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3); | |
273 | priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5); | |
429da1cc WG |
274 | } |
275 | ||
276 | for (i = 0; i < dlc; i++) | |
255a9154 | 277 | priv->write_reg(priv, dreg++, cf->data[i]); |
429da1cc WG |
278 | |
279 | stats->tx_bytes += dlc; | |
280 | dev->trans_start = jiffies; | |
281 | ||
282 | can_put_echo_skb(skb, dev, 0); | |
283 | ||
255a9154 | 284 | priv->write_reg(priv, REG_CMR, CMD_TR); |
429da1cc | 285 | |
6ed10654 | 286 | return NETDEV_TX_OK; |
429da1cc WG |
287 | } |
288 | ||
289 | static void sja1000_rx(struct net_device *dev) | |
290 | { | |
291 | struct sja1000_priv *priv = netdev_priv(dev); | |
292 | struct net_device_stats *stats = &dev->stats; | |
293 | struct can_frame *cf; | |
294 | struct sk_buff *skb; | |
295 | uint8_t fi; | |
296 | uint8_t dreg; | |
297 | canid_t id; | |
298 | uint8_t dlc; | |
299 | int i; | |
300 | ||
301 | skb = dev_alloc_skb(sizeof(struct can_frame)); | |
302 | if (skb == NULL) | |
303 | return; | |
304 | skb->dev = dev; | |
305 | skb->protocol = htons(ETH_P_CAN); | |
306 | ||
255a9154 | 307 | fi = priv->read_reg(priv, REG_FI); |
429da1cc WG |
308 | dlc = fi & 0x0F; |
309 | ||
310 | if (fi & FI_FF) { | |
311 | /* extended frame format (EFF) */ | |
312 | dreg = EFF_BUF; | |
255a9154 WG |
313 | id = (priv->read_reg(priv, REG_ID1) << (5 + 16)) |
314 | | (priv->read_reg(priv, REG_ID2) << (5 + 8)) | |
315 | | (priv->read_reg(priv, REG_ID3) << 5) | |
316 | | (priv->read_reg(priv, REG_ID4) >> 3); | |
429da1cc WG |
317 | id |= CAN_EFF_FLAG; |
318 | } else { | |
319 | /* standard frame format (SFF) */ | |
320 | dreg = SFF_BUF; | |
255a9154 WG |
321 | id = (priv->read_reg(priv, REG_ID1) << 3) |
322 | | (priv->read_reg(priv, REG_ID2) >> 5); | |
429da1cc WG |
323 | } |
324 | ||
325 | if (fi & FI_RTR) | |
326 | id |= CAN_RTR_FLAG; | |
327 | ||
328 | cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); | |
329 | memset(cf, 0, sizeof(struct can_frame)); | |
330 | cf->can_id = id; | |
331 | cf->can_dlc = dlc; | |
332 | for (i = 0; i < dlc; i++) | |
255a9154 | 333 | cf->data[i] = priv->read_reg(priv, dreg++); |
429da1cc WG |
334 | |
335 | while (i < 8) | |
336 | cf->data[i++] = 0; | |
337 | ||
338 | /* release receive buffer */ | |
255a9154 | 339 | priv->write_reg(priv, REG_CMR, CMD_RRB); |
429da1cc WG |
340 | |
341 | netif_rx(skb); | |
342 | ||
343 | dev->last_rx = jiffies; | |
344 | stats->rx_packets++; | |
345 | stats->rx_bytes += dlc; | |
346 | } | |
347 | ||
348 | static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) | |
349 | { | |
350 | struct sja1000_priv *priv = netdev_priv(dev); | |
351 | struct net_device_stats *stats = &dev->stats; | |
352 | struct can_frame *cf; | |
353 | struct sk_buff *skb; | |
354 | enum can_state state = priv->can.state; | |
355 | uint8_t ecc, alc; | |
356 | ||
357 | skb = dev_alloc_skb(sizeof(struct can_frame)); | |
358 | if (skb == NULL) | |
359 | return -ENOMEM; | |
360 | skb->dev = dev; | |
361 | skb->protocol = htons(ETH_P_CAN); | |
362 | cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); | |
363 | memset(cf, 0, sizeof(struct can_frame)); | |
364 | cf->can_id = CAN_ERR_FLAG; | |
365 | cf->can_dlc = CAN_ERR_DLC; | |
366 | ||
367 | if (isrc & IRQ_DOI) { | |
368 | /* data overrun interrupt */ | |
369 | dev_dbg(dev->dev.parent, "data overrun interrupt\n"); | |
370 | cf->can_id |= CAN_ERR_CRTL; | |
371 | cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; | |
372 | stats->rx_over_errors++; | |
373 | stats->rx_errors++; | |
255a9154 | 374 | priv->write_reg(priv, REG_CMR, CMD_CDO); /* clear bit */ |
429da1cc WG |
375 | } |
376 | ||
377 | if (isrc & IRQ_EI) { | |
378 | /* error warning interrupt */ | |
379 | dev_dbg(dev->dev.parent, "error warning interrupt\n"); | |
380 | ||
381 | if (status & SR_BS) { | |
382 | state = CAN_STATE_BUS_OFF; | |
383 | cf->can_id |= CAN_ERR_BUSOFF; | |
384 | can_bus_off(dev); | |
385 | } else if (status & SR_ES) { | |
386 | state = CAN_STATE_ERROR_WARNING; | |
387 | } else | |
388 | state = CAN_STATE_ERROR_ACTIVE; | |
389 | } | |
390 | if (isrc & IRQ_BEI) { | |
391 | /* bus error interrupt */ | |
392 | priv->can.can_stats.bus_error++; | |
393 | stats->rx_errors++; | |
394 | ||
255a9154 | 395 | ecc = priv->read_reg(priv, REG_ECC); |
429da1cc WG |
396 | |
397 | cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; | |
398 | ||
399 | switch (ecc & ECC_MASK) { | |
400 | case ECC_BIT: | |
401 | cf->data[2] |= CAN_ERR_PROT_BIT; | |
402 | break; | |
403 | case ECC_FORM: | |
404 | cf->data[2] |= CAN_ERR_PROT_FORM; | |
405 | break; | |
406 | case ECC_STUFF: | |
407 | cf->data[2] |= CAN_ERR_PROT_STUFF; | |
408 | break; | |
409 | default: | |
410 | cf->data[2] |= CAN_ERR_PROT_UNSPEC; | |
411 | cf->data[3] = ecc & ECC_SEG; | |
412 | break; | |
413 | } | |
414 | /* Error occured during transmission? */ | |
415 | if ((ecc & ECC_DIR) == 0) | |
416 | cf->data[2] |= CAN_ERR_PROT_TX; | |
417 | } | |
418 | if (isrc & IRQ_EPI) { | |
419 | /* error passive interrupt */ | |
420 | dev_dbg(dev->dev.parent, "error passive interrupt\n"); | |
421 | if (status & SR_ES) | |
422 | state = CAN_STATE_ERROR_PASSIVE; | |
423 | else | |
424 | state = CAN_STATE_ERROR_ACTIVE; | |
425 | } | |
426 | if (isrc & IRQ_ALI) { | |
427 | /* arbitration lost interrupt */ | |
428 | dev_dbg(dev->dev.parent, "arbitration lost interrupt\n"); | |
255a9154 | 429 | alc = priv->read_reg(priv, REG_ALC); |
429da1cc WG |
430 | priv->can.can_stats.arbitration_lost++; |
431 | stats->rx_errors++; | |
432 | cf->can_id |= CAN_ERR_LOSTARB; | |
433 | cf->data[0] = alc & 0x1f; | |
434 | } | |
435 | ||
436 | if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING || | |
437 | state == CAN_STATE_ERROR_PASSIVE)) { | |
255a9154 WG |
438 | uint8_t rxerr = priv->read_reg(priv, REG_RXERR); |
439 | uint8_t txerr = priv->read_reg(priv, REG_TXERR); | |
429da1cc WG |
440 | cf->can_id |= CAN_ERR_CRTL; |
441 | if (state == CAN_STATE_ERROR_WARNING) { | |
442 | priv->can.can_stats.error_warning++; | |
443 | cf->data[1] = (txerr > rxerr) ? | |
444 | CAN_ERR_CRTL_TX_WARNING : | |
445 | CAN_ERR_CRTL_RX_WARNING; | |
446 | } else { | |
447 | priv->can.can_stats.error_passive++; | |
448 | cf->data[1] = (txerr > rxerr) ? | |
449 | CAN_ERR_CRTL_TX_PASSIVE : | |
450 | CAN_ERR_CRTL_RX_PASSIVE; | |
451 | } | |
452 | } | |
453 | ||
454 | priv->can.state = state; | |
455 | ||
456 | netif_rx(skb); | |
457 | ||
458 | dev->last_rx = jiffies; | |
459 | stats->rx_packets++; | |
460 | stats->rx_bytes += cf->can_dlc; | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
465 | irqreturn_t sja1000_interrupt(int irq, void *dev_id) | |
466 | { | |
467 | struct net_device *dev = (struct net_device *)dev_id; | |
468 | struct sja1000_priv *priv = netdev_priv(dev); | |
469 | struct net_device_stats *stats = &dev->stats; | |
470 | uint8_t isrc, status; | |
471 | int n = 0; | |
472 | ||
473 | /* Shared interrupts and IRQ off? */ | |
255a9154 | 474 | if (priv->read_reg(priv, REG_IER) == IRQ_OFF) |
429da1cc WG |
475 | return IRQ_NONE; |
476 | ||
477 | if (priv->pre_irq) | |
255a9154 | 478 | priv->pre_irq(priv); |
429da1cc | 479 | |
255a9154 | 480 | while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) { |
429da1cc | 481 | n++; |
255a9154 | 482 | status = priv->read_reg(priv, REG_SR); |
429da1cc WG |
483 | |
484 | if (isrc & IRQ_WUI) | |
485 | dev_warn(dev->dev.parent, "wakeup interrupt\n"); | |
486 | ||
487 | if (isrc & IRQ_TI) { | |
488 | /* transmission complete interrupt */ | |
489 | stats->tx_packets++; | |
490 | can_get_echo_skb(dev, 0); | |
491 | netif_wake_queue(dev); | |
492 | } | |
493 | if (isrc & IRQ_RI) { | |
494 | /* receive interrupt */ | |
495 | while (status & SR_RBS) { | |
496 | sja1000_rx(dev); | |
255a9154 | 497 | status = priv->read_reg(priv, REG_SR); |
429da1cc WG |
498 | } |
499 | } | |
500 | if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { | |
501 | /* error interrupt */ | |
502 | if (sja1000_err(dev, isrc, status)) | |
503 | break; | |
504 | } | |
505 | } | |
506 | ||
507 | if (priv->post_irq) | |
255a9154 | 508 | priv->post_irq(priv); |
429da1cc WG |
509 | |
510 | if (n >= SJA1000_MAX_IRQ) | |
511 | dev_dbg(dev->dev.parent, "%d messages handled in ISR", n); | |
512 | ||
513 | return (n) ? IRQ_HANDLED : IRQ_NONE; | |
514 | } | |
515 | EXPORT_SYMBOL_GPL(sja1000_interrupt); | |
516 | ||
517 | static int sja1000_open(struct net_device *dev) | |
518 | { | |
519 | struct sja1000_priv *priv = netdev_priv(dev); | |
520 | int err; | |
521 | ||
522 | /* set chip into reset mode */ | |
523 | set_reset_mode(dev); | |
524 | ||
525 | /* common open */ | |
526 | err = open_candev(dev); | |
527 | if (err) | |
528 | return err; | |
529 | ||
530 | /* register interrupt handler, if not done by the device driver */ | |
531 | if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) { | |
532 | err = request_irq(dev->irq, &sja1000_interrupt, priv->irq_flags, | |
533 | dev->name, (void *)dev); | |
534 | if (err) { | |
429da1cc | 535 | close_candev(dev); |
128ced8f | 536 | return -EAGAIN; |
429da1cc WG |
537 | } |
538 | } | |
539 | ||
540 | /* init and start chi */ | |
541 | sja1000_start(dev); | |
542 | priv->open_time = jiffies; | |
543 | ||
544 | netif_start_queue(dev); | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
549 | static int sja1000_close(struct net_device *dev) | |
550 | { | |
551 | struct sja1000_priv *priv = netdev_priv(dev); | |
552 | ||
553 | netif_stop_queue(dev); | |
554 | set_reset_mode(dev); | |
555 | ||
556 | if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) | |
557 | free_irq(dev->irq, (void *)dev); | |
558 | ||
559 | close_candev(dev); | |
560 | ||
561 | priv->open_time = 0; | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
566 | struct net_device *alloc_sja1000dev(int sizeof_priv) | |
567 | { | |
568 | struct net_device *dev; | |
569 | struct sja1000_priv *priv; | |
570 | ||
571 | dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv); | |
572 | if (!dev) | |
573 | return NULL; | |
574 | ||
575 | priv = netdev_priv(dev); | |
576 | ||
577 | priv->dev = dev; | |
578 | priv->can.bittiming_const = &sja1000_bittiming_const; | |
579 | priv->can.do_set_bittiming = sja1000_set_bittiming; | |
580 | priv->can.do_set_mode = sja1000_set_mode; | |
581 | ||
582 | if (sizeof_priv) | |
583 | priv->priv = (void *)priv + sizeof(struct sja1000_priv); | |
584 | ||
585 | return dev; | |
586 | } | |
587 | EXPORT_SYMBOL_GPL(alloc_sja1000dev); | |
588 | ||
589 | void free_sja1000dev(struct net_device *dev) | |
590 | { | |
591 | free_candev(dev); | |
592 | } | |
593 | EXPORT_SYMBOL_GPL(free_sja1000dev); | |
594 | ||
595 | static const struct net_device_ops sja1000_netdev_ops = { | |
596 | .ndo_open = sja1000_open, | |
597 | .ndo_stop = sja1000_close, | |
598 | .ndo_start_xmit = sja1000_start_xmit, | |
599 | }; | |
600 | ||
601 | int register_sja1000dev(struct net_device *dev) | |
602 | { | |
603 | if (!sja1000_probe_chip(dev)) | |
604 | return -ENODEV; | |
605 | ||
606 | dev->flags |= IFF_ECHO; /* we support local echo */ | |
607 | dev->netdev_ops = &sja1000_netdev_ops; | |
608 | ||
609 | set_reset_mode(dev); | |
610 | chipset_init(dev); | |
611 | ||
612 | return register_candev(dev); | |
613 | } | |
614 | EXPORT_SYMBOL_GPL(register_sja1000dev); | |
615 | ||
616 | void unregister_sja1000dev(struct net_device *dev) | |
617 | { | |
618 | set_reset_mode(dev); | |
619 | unregister_candev(dev); | |
620 | } | |
621 | EXPORT_SYMBOL_GPL(unregister_sja1000dev); | |
622 | ||
623 | static __init int sja1000_init(void) | |
624 | { | |
625 | printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME); | |
626 | ||
627 | return 0; | |
628 | } | |
629 | ||
630 | module_init(sja1000_init); | |
631 | ||
632 | static __exit void sja1000_exit(void) | |
633 | { | |
634 | printk(KERN_INFO "%s: driver removed\n", DRV_NAME); | |
635 | } | |
636 | ||
637 | module_exit(sja1000_exit); |