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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 | * | |
429da1cc WG |
43 | */ |
44 | ||
45 | #include <linux/module.h> | |
46 | #include <linux/init.h> | |
47 | #include <linux/kernel.h> | |
48 | #include <linux/sched.h> | |
49 | #include <linux/types.h> | |
50 | #include <linux/fcntl.h> | |
51 | #include <linux/interrupt.h> | |
52 | #include <linux/ptrace.h> | |
53 | #include <linux/string.h> | |
54 | #include <linux/errno.h> | |
55 | #include <linux/netdevice.h> | |
56 | #include <linux/if_arp.h> | |
57 | #include <linux/if_ether.h> | |
58 | #include <linux/skbuff.h> | |
59 | #include <linux/delay.h> | |
60 | ||
429da1cc WG |
61 | #include <linux/can/dev.h> |
62 | #include <linux/can/error.h> | |
429da1cc WG |
63 | |
64 | #include "sja1000.h" | |
65 | ||
66 | #define DRV_NAME "sja1000" | |
67 | ||
68 | MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>"); | |
69 | MODULE_LICENSE("Dual BSD/GPL"); | |
70 | MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver"); | |
71 | ||
72 | static struct can_bittiming_const sja1000_bittiming_const = { | |
73 | .name = DRV_NAME, | |
74 | .tseg1_min = 1, | |
75 | .tseg1_max = 16, | |
76 | .tseg2_min = 1, | |
77 | .tseg2_max = 8, | |
78 | .sjw_max = 4, | |
79 | .brp_min = 1, | |
80 | .brp_max = 64, | |
81 | .brp_inc = 1, | |
82 | }; | |
83 | ||
57c8a456 OH |
84 | static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val) |
85 | { | |
86 | unsigned long flags; | |
87 | ||
88 | /* | |
89 | * The command register needs some locking and time to settle | |
90 | * the write_reg() operation - especially on SMP systems. | |
91 | */ | |
92 | spin_lock_irqsave(&priv->cmdreg_lock, flags); | |
93 | priv->write_reg(priv, REG_CMR, val); | |
94 | priv->read_reg(priv, REG_SR); | |
95 | spin_unlock_irqrestore(&priv->cmdreg_lock, flags); | |
96 | } | |
97 | ||
429da1cc WG |
98 | static int sja1000_probe_chip(struct net_device *dev) |
99 | { | |
100 | struct sja1000_priv *priv = netdev_priv(dev); | |
101 | ||
255a9154 | 102 | if (priv->reg_base && (priv->read_reg(priv, 0) == 0xFF)) { |
429da1cc WG |
103 | printk(KERN_INFO "%s: probing @0x%lX failed\n", |
104 | DRV_NAME, dev->base_addr); | |
105 | return 0; | |
106 | } | |
107 | return -1; | |
108 | } | |
109 | ||
110 | static void set_reset_mode(struct net_device *dev) | |
111 | { | |
112 | struct sja1000_priv *priv = netdev_priv(dev); | |
255a9154 | 113 | unsigned char status = priv->read_reg(priv, REG_MOD); |
429da1cc WG |
114 | int i; |
115 | ||
116 | /* disable interrupts */ | |
255a9154 | 117 | priv->write_reg(priv, REG_IER, IRQ_OFF); |
429da1cc WG |
118 | |
119 | for (i = 0; i < 100; i++) { | |
120 | /* check reset bit */ | |
121 | if (status & MOD_RM) { | |
122 | priv->can.state = CAN_STATE_STOPPED; | |
123 | return; | |
124 | } | |
125 | ||
255a9154 | 126 | priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */ |
429da1cc | 127 | udelay(10); |
255a9154 | 128 | status = priv->read_reg(priv, REG_MOD); |
429da1cc WG |
129 | } |
130 | ||
131 | dev_err(dev->dev.parent, "setting SJA1000 into reset mode failed!\n"); | |
132 | } | |
133 | ||
134 | static void set_normal_mode(struct net_device *dev) | |
135 | { | |
136 | struct sja1000_priv *priv = netdev_priv(dev); | |
255a9154 | 137 | unsigned char status = priv->read_reg(priv, REG_MOD); |
429da1cc WG |
138 | int i; |
139 | ||
140 | for (i = 0; i < 100; i++) { | |
141 | /* check reset bit */ | |
142 | if ((status & MOD_RM) == 0) { | |
143 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
52c793f2 WG |
144 | /* enable interrupts */ |
145 | if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) | |
146 | priv->write_reg(priv, REG_IER, IRQ_ALL); | |
147 | else | |
148 | priv->write_reg(priv, REG_IER, | |
149 | IRQ_ALL & ~IRQ_BEI); | |
429da1cc WG |
150 | return; |
151 | } | |
152 | ||
153 | /* set chip to normal mode */ | |
255a9154 | 154 | priv->write_reg(priv, REG_MOD, 0x00); |
429da1cc | 155 | udelay(10); |
255a9154 | 156 | status = priv->read_reg(priv, REG_MOD); |
429da1cc WG |
157 | } |
158 | ||
159 | dev_err(dev->dev.parent, "setting SJA1000 into normal mode failed!\n"); | |
160 | } | |
161 | ||
162 | static void sja1000_start(struct net_device *dev) | |
163 | { | |
164 | struct sja1000_priv *priv = netdev_priv(dev); | |
165 | ||
166 | /* leave reset mode */ | |
167 | if (priv->can.state != CAN_STATE_STOPPED) | |
168 | set_reset_mode(dev); | |
169 | ||
170 | /* Clear error counters and error code capture */ | |
255a9154 WG |
171 | priv->write_reg(priv, REG_TXERR, 0x0); |
172 | priv->write_reg(priv, REG_RXERR, 0x0); | |
173 | priv->read_reg(priv, REG_ECC); | |
429da1cc WG |
174 | |
175 | /* leave reset mode */ | |
176 | set_normal_mode(dev); | |
177 | } | |
178 | ||
179 | static int sja1000_set_mode(struct net_device *dev, enum can_mode mode) | |
180 | { | |
181 | struct sja1000_priv *priv = netdev_priv(dev); | |
182 | ||
183 | if (!priv->open_time) | |
184 | return -EINVAL; | |
185 | ||
186 | switch (mode) { | |
187 | case CAN_MODE_START: | |
188 | sja1000_start(dev); | |
189 | if (netif_queue_stopped(dev)) | |
190 | netif_wake_queue(dev); | |
191 | break; | |
192 | ||
193 | default: | |
194 | return -EOPNOTSUPP; | |
195 | } | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | static int sja1000_set_bittiming(struct net_device *dev) | |
201 | { | |
202 | struct sja1000_priv *priv = netdev_priv(dev); | |
203 | struct can_bittiming *bt = &priv->can.bittiming; | |
204 | u8 btr0, btr1; | |
205 | ||
206 | btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); | |
207 | btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | | |
208 | (((bt->phase_seg2 - 1) & 0x7) << 4); | |
209 | if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) | |
210 | btr1 |= 0x80; | |
211 | ||
212 | dev_info(dev->dev.parent, | |
213 | "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); | |
214 | ||
255a9154 WG |
215 | priv->write_reg(priv, REG_BTR0, btr0); |
216 | priv->write_reg(priv, REG_BTR1, btr1); | |
429da1cc WG |
217 | |
218 | return 0; | |
219 | } | |
220 | ||
52c793f2 WG |
221 | static int sja1000_get_berr_counter(const struct net_device *dev, |
222 | struct can_berr_counter *bec) | |
223 | { | |
224 | struct sja1000_priv *priv = netdev_priv(dev); | |
225 | ||
226 | bec->txerr = priv->read_reg(priv, REG_TXERR); | |
227 | bec->rxerr = priv->read_reg(priv, REG_RXERR); | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
429da1cc WG |
232 | /* |
233 | * initialize SJA1000 chip: | |
234 | * - reset chip | |
235 | * - set output mode | |
236 | * - set baudrate | |
237 | * - enable interrupts | |
238 | * - start operating mode | |
239 | */ | |
240 | static void chipset_init(struct net_device *dev) | |
241 | { | |
242 | struct sja1000_priv *priv = netdev_priv(dev); | |
243 | ||
244 | /* set clock divider and output control register */ | |
255a9154 | 245 | priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN); |
429da1cc WG |
246 | |
247 | /* set acceptance filter (accept all) */ | |
255a9154 WG |
248 | priv->write_reg(priv, REG_ACCC0, 0x00); |
249 | priv->write_reg(priv, REG_ACCC1, 0x00); | |
250 | priv->write_reg(priv, REG_ACCC2, 0x00); | |
251 | priv->write_reg(priv, REG_ACCC3, 0x00); | |
429da1cc | 252 | |
255a9154 WG |
253 | priv->write_reg(priv, REG_ACCM0, 0xFF); |
254 | priv->write_reg(priv, REG_ACCM1, 0xFF); | |
255 | priv->write_reg(priv, REG_ACCM2, 0xFF); | |
256 | priv->write_reg(priv, REG_ACCM3, 0xFF); | |
429da1cc | 257 | |
255a9154 | 258 | priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL); |
429da1cc WG |
259 | } |
260 | ||
261 | /* | |
262 | * transmit a CAN message | |
263 | * message layout in the sk_buff should be like this: | |
264 | * xx xx xx xx ff ll 00 11 22 33 44 55 66 77 | |
265 | * [ can-id ] [flags] [len] [can data (up to 8 bytes] | |
266 | */ | |
61357325 SH |
267 | static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb, |
268 | struct net_device *dev) | |
429da1cc WG |
269 | { |
270 | struct sja1000_priv *priv = netdev_priv(dev); | |
429da1cc WG |
271 | struct can_frame *cf = (struct can_frame *)skb->data; |
272 | uint8_t fi; | |
273 | uint8_t dlc; | |
274 | canid_t id; | |
275 | uint8_t dreg; | |
276 | int i; | |
277 | ||
3ccd4c61 OH |
278 | if (can_dropped_invalid_skb(dev, skb)) |
279 | return NETDEV_TX_OK; | |
280 | ||
429da1cc WG |
281 | netif_stop_queue(dev); |
282 | ||
283 | fi = dlc = cf->can_dlc; | |
284 | id = cf->can_id; | |
285 | ||
286 | if (id & CAN_RTR_FLAG) | |
287 | fi |= FI_RTR; | |
288 | ||
289 | if (id & CAN_EFF_FLAG) { | |
290 | fi |= FI_FF; | |
291 | dreg = EFF_BUF; | |
255a9154 WG |
292 | priv->write_reg(priv, REG_FI, fi); |
293 | priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16)); | |
294 | priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8)); | |
295 | priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5); | |
296 | priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3); | |
429da1cc WG |
297 | } else { |
298 | dreg = SFF_BUF; | |
255a9154 WG |
299 | priv->write_reg(priv, REG_FI, fi); |
300 | priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3); | |
301 | priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5); | |
429da1cc WG |
302 | } |
303 | ||
304 | for (i = 0; i < dlc; i++) | |
255a9154 | 305 | priv->write_reg(priv, dreg++, cf->data[i]); |
429da1cc | 306 | |
429da1cc WG |
307 | can_put_echo_skb(skb, dev, 0); |
308 | ||
57c8a456 | 309 | sja1000_write_cmdreg(priv, CMD_TR); |
429da1cc | 310 | |
6ed10654 | 311 | return NETDEV_TX_OK; |
429da1cc WG |
312 | } |
313 | ||
314 | static void sja1000_rx(struct net_device *dev) | |
315 | { | |
316 | struct sja1000_priv *priv = netdev_priv(dev); | |
317 | struct net_device_stats *stats = &dev->stats; | |
318 | struct can_frame *cf; | |
319 | struct sk_buff *skb; | |
320 | uint8_t fi; | |
321 | uint8_t dreg; | |
322 | canid_t id; | |
429da1cc WG |
323 | int i; |
324 | ||
c7cd606f | 325 | /* create zero'ed CAN frame buffer */ |
7b6856a0 | 326 | skb = alloc_can_skb(dev, &cf); |
429da1cc WG |
327 | if (skb == NULL) |
328 | return; | |
429da1cc | 329 | |
255a9154 | 330 | fi = priv->read_reg(priv, REG_FI); |
429da1cc WG |
331 | |
332 | if (fi & FI_FF) { | |
333 | /* extended frame format (EFF) */ | |
334 | dreg = EFF_BUF; | |
255a9154 WG |
335 | id = (priv->read_reg(priv, REG_ID1) << (5 + 16)) |
336 | | (priv->read_reg(priv, REG_ID2) << (5 + 8)) | |
337 | | (priv->read_reg(priv, REG_ID3) << 5) | |
338 | | (priv->read_reg(priv, REG_ID4) >> 3); | |
429da1cc WG |
339 | id |= CAN_EFF_FLAG; |
340 | } else { | |
341 | /* standard frame format (SFF) */ | |
342 | dreg = SFF_BUF; | |
255a9154 WG |
343 | id = (priv->read_reg(priv, REG_ID1) << 3) |
344 | | (priv->read_reg(priv, REG_ID2) >> 5); | |
429da1cc WG |
345 | } |
346 | ||
87e9af6c | 347 | cf->can_dlc = get_can_dlc(fi & 0x0F); |
c7cd606f | 348 | if (fi & FI_RTR) { |
429da1cc | 349 | id |= CAN_RTR_FLAG; |
c7cd606f | 350 | } else { |
c7cd606f OH |
351 | for (i = 0; i < cf->can_dlc; i++) |
352 | cf->data[i] = priv->read_reg(priv, dreg++); | |
353 | } | |
429da1cc | 354 | |
429da1cc | 355 | cf->can_id = id; |
429da1cc WG |
356 | |
357 | /* release receive buffer */ | |
57c8a456 | 358 | sja1000_write_cmdreg(priv, CMD_RRB); |
429da1cc WG |
359 | |
360 | netif_rx(skb); | |
361 | ||
429da1cc | 362 | stats->rx_packets++; |
c7cd606f | 363 | stats->rx_bytes += cf->can_dlc; |
429da1cc WG |
364 | } |
365 | ||
366 | static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) | |
367 | { | |
368 | struct sja1000_priv *priv = netdev_priv(dev); | |
369 | struct net_device_stats *stats = &dev->stats; | |
370 | struct can_frame *cf; | |
371 | struct sk_buff *skb; | |
372 | enum can_state state = priv->can.state; | |
373 | uint8_t ecc, alc; | |
374 | ||
7b6856a0 | 375 | skb = alloc_can_err_skb(dev, &cf); |
429da1cc WG |
376 | if (skb == NULL) |
377 | return -ENOMEM; | |
429da1cc WG |
378 | |
379 | if (isrc & IRQ_DOI) { | |
380 | /* data overrun interrupt */ | |
381 | dev_dbg(dev->dev.parent, "data overrun interrupt\n"); | |
382 | cf->can_id |= CAN_ERR_CRTL; | |
383 | cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; | |
384 | stats->rx_over_errors++; | |
385 | stats->rx_errors++; | |
57c8a456 | 386 | sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */ |
429da1cc WG |
387 | } |
388 | ||
389 | if (isrc & IRQ_EI) { | |
390 | /* error warning interrupt */ | |
391 | dev_dbg(dev->dev.parent, "error warning interrupt\n"); | |
392 | ||
393 | if (status & SR_BS) { | |
394 | state = CAN_STATE_BUS_OFF; | |
395 | cf->can_id |= CAN_ERR_BUSOFF; | |
396 | can_bus_off(dev); | |
397 | } else if (status & SR_ES) { | |
398 | state = CAN_STATE_ERROR_WARNING; | |
399 | } else | |
400 | state = CAN_STATE_ERROR_ACTIVE; | |
401 | } | |
402 | if (isrc & IRQ_BEI) { | |
403 | /* bus error interrupt */ | |
404 | priv->can.can_stats.bus_error++; | |
405 | stats->rx_errors++; | |
406 | ||
255a9154 | 407 | ecc = priv->read_reg(priv, REG_ECC); |
429da1cc WG |
408 | |
409 | cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; | |
410 | ||
411 | switch (ecc & ECC_MASK) { | |
412 | case ECC_BIT: | |
413 | cf->data[2] |= CAN_ERR_PROT_BIT; | |
414 | break; | |
415 | case ECC_FORM: | |
416 | cf->data[2] |= CAN_ERR_PROT_FORM; | |
417 | break; | |
418 | case ECC_STUFF: | |
419 | cf->data[2] |= CAN_ERR_PROT_STUFF; | |
420 | break; | |
421 | default: | |
422 | cf->data[2] |= CAN_ERR_PROT_UNSPEC; | |
423 | cf->data[3] = ecc & ECC_SEG; | |
424 | break; | |
425 | } | |
25985edc | 426 | /* Error occurred during transmission? */ |
429da1cc WG |
427 | if ((ecc & ECC_DIR) == 0) |
428 | cf->data[2] |= CAN_ERR_PROT_TX; | |
429 | } | |
430 | if (isrc & IRQ_EPI) { | |
431 | /* error passive interrupt */ | |
432 | dev_dbg(dev->dev.parent, "error passive interrupt\n"); | |
433 | if (status & SR_ES) | |
434 | state = CAN_STATE_ERROR_PASSIVE; | |
435 | else | |
436 | state = CAN_STATE_ERROR_ACTIVE; | |
437 | } | |
438 | if (isrc & IRQ_ALI) { | |
439 | /* arbitration lost interrupt */ | |
440 | dev_dbg(dev->dev.parent, "arbitration lost interrupt\n"); | |
255a9154 | 441 | alc = priv->read_reg(priv, REG_ALC); |
429da1cc | 442 | priv->can.can_stats.arbitration_lost++; |
8935f57e | 443 | stats->tx_errors++; |
429da1cc WG |
444 | cf->can_id |= CAN_ERR_LOSTARB; |
445 | cf->data[0] = alc & 0x1f; | |
446 | } | |
447 | ||
448 | if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING || | |
449 | state == CAN_STATE_ERROR_PASSIVE)) { | |
255a9154 WG |
450 | uint8_t rxerr = priv->read_reg(priv, REG_RXERR); |
451 | uint8_t txerr = priv->read_reg(priv, REG_TXERR); | |
429da1cc WG |
452 | cf->can_id |= CAN_ERR_CRTL; |
453 | if (state == CAN_STATE_ERROR_WARNING) { | |
454 | priv->can.can_stats.error_warning++; | |
455 | cf->data[1] = (txerr > rxerr) ? | |
456 | CAN_ERR_CRTL_TX_WARNING : | |
457 | CAN_ERR_CRTL_RX_WARNING; | |
458 | } else { | |
459 | priv->can.can_stats.error_passive++; | |
460 | cf->data[1] = (txerr > rxerr) ? | |
461 | CAN_ERR_CRTL_TX_PASSIVE : | |
462 | CAN_ERR_CRTL_RX_PASSIVE; | |
463 | } | |
52c793f2 WG |
464 | cf->data[6] = txerr; |
465 | cf->data[7] = rxerr; | |
429da1cc WG |
466 | } |
467 | ||
468 | priv->can.state = state; | |
469 | ||
470 | netif_rx(skb); | |
471 | ||
429da1cc WG |
472 | stats->rx_packets++; |
473 | stats->rx_bytes += cf->can_dlc; | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
478 | irqreturn_t sja1000_interrupt(int irq, void *dev_id) | |
479 | { | |
480 | struct net_device *dev = (struct net_device *)dev_id; | |
481 | struct sja1000_priv *priv = netdev_priv(dev); | |
482 | struct net_device_stats *stats = &dev->stats; | |
483 | uint8_t isrc, status; | |
484 | int n = 0; | |
485 | ||
486 | /* Shared interrupts and IRQ off? */ | |
255a9154 | 487 | if (priv->read_reg(priv, REG_IER) == IRQ_OFF) |
429da1cc WG |
488 | return IRQ_NONE; |
489 | ||
490 | if (priv->pre_irq) | |
255a9154 | 491 | priv->pre_irq(priv); |
429da1cc | 492 | |
255a9154 | 493 | while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) { |
429da1cc | 494 | n++; |
255a9154 | 495 | status = priv->read_reg(priv, REG_SR); |
429da1cc WG |
496 | |
497 | if (isrc & IRQ_WUI) | |
498 | dev_warn(dev->dev.parent, "wakeup interrupt\n"); | |
499 | ||
500 | if (isrc & IRQ_TI) { | |
501 | /* transmission complete interrupt */ | |
8935f57e | 502 | stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf; |
429da1cc WG |
503 | stats->tx_packets++; |
504 | can_get_echo_skb(dev, 0); | |
505 | netif_wake_queue(dev); | |
506 | } | |
507 | if (isrc & IRQ_RI) { | |
508 | /* receive interrupt */ | |
509 | while (status & SR_RBS) { | |
510 | sja1000_rx(dev); | |
255a9154 | 511 | status = priv->read_reg(priv, REG_SR); |
429da1cc WG |
512 | } |
513 | } | |
514 | if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { | |
515 | /* error interrupt */ | |
516 | if (sja1000_err(dev, isrc, status)) | |
517 | break; | |
518 | } | |
519 | } | |
520 | ||
521 | if (priv->post_irq) | |
255a9154 | 522 | priv->post_irq(priv); |
429da1cc WG |
523 | |
524 | if (n >= SJA1000_MAX_IRQ) | |
525 | dev_dbg(dev->dev.parent, "%d messages handled in ISR", n); | |
526 | ||
527 | return (n) ? IRQ_HANDLED : IRQ_NONE; | |
528 | } | |
529 | EXPORT_SYMBOL_GPL(sja1000_interrupt); | |
530 | ||
531 | static int sja1000_open(struct net_device *dev) | |
532 | { | |
533 | struct sja1000_priv *priv = netdev_priv(dev); | |
534 | int err; | |
535 | ||
536 | /* set chip into reset mode */ | |
537 | set_reset_mode(dev); | |
538 | ||
539 | /* common open */ | |
540 | err = open_candev(dev); | |
541 | if (err) | |
542 | return err; | |
543 | ||
544 | /* register interrupt handler, if not done by the device driver */ | |
545 | if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) { | |
4c9ba61e | 546 | err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags, |
429da1cc WG |
547 | dev->name, (void *)dev); |
548 | if (err) { | |
429da1cc | 549 | close_candev(dev); |
128ced8f | 550 | return -EAGAIN; |
429da1cc WG |
551 | } |
552 | } | |
553 | ||
554 | /* init and start chi */ | |
555 | sja1000_start(dev); | |
556 | priv->open_time = jiffies; | |
557 | ||
558 | netif_start_queue(dev); | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
563 | static int sja1000_close(struct net_device *dev) | |
564 | { | |
565 | struct sja1000_priv *priv = netdev_priv(dev); | |
566 | ||
567 | netif_stop_queue(dev); | |
568 | set_reset_mode(dev); | |
569 | ||
570 | if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) | |
571 | free_irq(dev->irq, (void *)dev); | |
572 | ||
573 | close_candev(dev); | |
574 | ||
575 | priv->open_time = 0; | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
580 | struct net_device *alloc_sja1000dev(int sizeof_priv) | |
581 | { | |
582 | struct net_device *dev; | |
583 | struct sja1000_priv *priv; | |
584 | ||
a6e4bc53 WG |
585 | dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv, |
586 | SJA1000_ECHO_SKB_MAX); | |
429da1cc WG |
587 | if (!dev) |
588 | return NULL; | |
589 | ||
590 | priv = netdev_priv(dev); | |
591 | ||
592 | priv->dev = dev; | |
593 | priv->can.bittiming_const = &sja1000_bittiming_const; | |
594 | priv->can.do_set_bittiming = sja1000_set_bittiming; | |
595 | priv->can.do_set_mode = sja1000_set_mode; | |
52c793f2 WG |
596 | priv->can.do_get_berr_counter = sja1000_get_berr_counter; |
597 | priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | | |
598 | CAN_CTRLMODE_BERR_REPORTING; | |
429da1cc | 599 | |
1f01bfd2 OH |
600 | spin_lock_init(&priv->cmdreg_lock); |
601 | ||
429da1cc WG |
602 | if (sizeof_priv) |
603 | priv->priv = (void *)priv + sizeof(struct sja1000_priv); | |
604 | ||
605 | return dev; | |
606 | } | |
607 | EXPORT_SYMBOL_GPL(alloc_sja1000dev); | |
608 | ||
609 | void free_sja1000dev(struct net_device *dev) | |
610 | { | |
611 | free_candev(dev); | |
612 | } | |
613 | EXPORT_SYMBOL_GPL(free_sja1000dev); | |
614 | ||
615 | static const struct net_device_ops sja1000_netdev_ops = { | |
616 | .ndo_open = sja1000_open, | |
617 | .ndo_stop = sja1000_close, | |
618 | .ndo_start_xmit = sja1000_start_xmit, | |
619 | }; | |
620 | ||
621 | int register_sja1000dev(struct net_device *dev) | |
622 | { | |
623 | if (!sja1000_probe_chip(dev)) | |
624 | return -ENODEV; | |
625 | ||
626 | dev->flags |= IFF_ECHO; /* we support local echo */ | |
627 | dev->netdev_ops = &sja1000_netdev_ops; | |
628 | ||
629 | set_reset_mode(dev); | |
630 | chipset_init(dev); | |
631 | ||
632 | return register_candev(dev); | |
633 | } | |
634 | EXPORT_SYMBOL_GPL(register_sja1000dev); | |
635 | ||
636 | void unregister_sja1000dev(struct net_device *dev) | |
637 | { | |
638 | set_reset_mode(dev); | |
639 | unregister_candev(dev); | |
640 | } | |
641 | EXPORT_SYMBOL_GPL(unregister_sja1000dev); | |
642 | ||
643 | static __init int sja1000_init(void) | |
644 | { | |
645 | printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME); | |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
650 | module_init(sja1000_init); | |
651 | ||
652 | static __exit void sja1000_exit(void) | |
653 | { | |
654 | printk(KERN_INFO "%s: driver removed\n", DRV_NAME); | |
655 | } | |
656 | ||
657 | module_exit(sja1000_exit); |