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can: cc770: add driver core for the Bosch CC770 and Intel AN82527
[deliverable/linux.git] / drivers / net / can / cc770 / cc770.c
CommitLineData
2a367c3a
WG		 1/*
2 * Core driver for the CC770 and AN82527 CAN controllers
3 *
4 * Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the version 2 of the GNU General Public License
8 * as published by the Free Software Foundation
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/kernel.h>
21#include <linux/sched.h>
22#include <linux/types.h>
23#include <linux/fcntl.h>
24#include <linux/interrupt.h>
25#include <linux/ptrace.h>
26#include <linux/string.h>
27#include <linux/errno.h>
28#include <linux/netdevice.h>
29#include <linux/if_arp.h>
30#include <linux/if_ether.h>
31#include <linux/skbuff.h>
32#include <linux/delay.h>
33
34#include <linux/can.h>
35#include <linux/can/dev.h>
36#include <linux/can/error.h>
37#include <linux/can/dev.h>
38#include <linux/can/platform/cc770.h>
39
40#include "cc770.h"
41
42MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
43MODULE_LICENSE("GPL v2");
44MODULE_DESCRIPTION(KBUILD_MODNAME "CAN netdevice driver");
45
46/*
47 * The CC770 is a CAN controller from Bosch, which is 100% compatible
48 * with the AN82527 from Intel, but with "bugs" being fixed and some
49 * additional functionality, mainly:
50 *
51 * 1. RX and TX error counters are readable.
52 * 2. Support of silent (listen-only) mode.
53 * 3. Message object 15 can receive all types of frames, also RTR and EFF.
54 *
55 * Details are available from Bosch's "CC770_Product_Info_2007-01.pdf",
56 * which explains in detail the compatibility between the CC770 and the
57 * 82527. This driver use the additional functionality 3. on real CC770
58 * devices. Unfortunately, the CC770 does still not store the message
59 * identifier of received remote transmission request frames and
60 * therefore it's set to 0.
61 *
62 * The message objects 1..14 can be used for TX and RX while the message
63 * objects 15 is optimized for RX. It has a shadow register for reliable
64 * data receiption under heavy bus load. Therefore it makes sense to use
65 * this message object for the needed use case. The frame type (EFF/SFF)
66 * for the message object 15 can be defined via kernel module parameter
67 * "msgobj15_eff". If not equal 0, it will receive 29-bit EFF frames,
68 * otherwise 11 bit SFF messages.
69 */
70static int msgobj15_eff;
71module_param(msgobj15_eff, int, S_IRUGO);
72MODULE_PARM_DESC(msgobj15_eff, "Extended 29-bit frames for message object 15 "
73 "(default: 11-bit standard frames)");
74
75static int i82527_compat;
76module_param(i82527_compat, int, S_IRUGO);
77MODULE_PARM_DESC(i82527_compat, "Strict Intel 82527 comptibility mode "
78 "without using additional functions");
79
80/*
81 * This driver uses the last 5 message objects 11..15. The definitions
82 * and structure below allows to configure and assign them to the real
83 * message object.
84 */
85static unsigned char cc770_obj_flags[CC770_OBJ_MAX] = {
86 [CC770_OBJ_RX0] = CC770_OBJ_FLAG_RX,
87 [CC770_OBJ_RX1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_EFF,
88 [CC770_OBJ_RX_RTR0] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR,
89 [CC770_OBJ_RX_RTR1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR |
90 CC770_OBJ_FLAG_EFF,
91 [CC770_OBJ_TX] = 0,
92};
93
94static struct can_bittiming_const cc770_bittiming_const = {
95 .name = KBUILD_MODNAME,
96 .tseg1_min = 1,
97 .tseg1_max = 16,
98 .tseg2_min = 1,
99 .tseg2_max = 8,
100 .sjw_max = 4,
101 .brp_min = 1,
102 .brp_max = 64,
103 .brp_inc = 1,
104};
105
106static inline int intid2obj(unsigned int intid)
107{
108 if (intid == 2)
109 return 0;
110 else
111 return MSGOBJ_LAST + 2 - intid;
112}
113
114static void enable_all_objs(const struct net_device *dev)
115{
116 struct cc770_priv *priv = netdev_priv(dev);
117 u8 msgcfg;
118 unsigned char obj_flags;
119 unsigned int o, mo;
120
121 for (o = 0; o < ARRAY_SIZE(priv->obj_flags); o++) {
122 obj_flags = priv->obj_flags[o];
123 mo = obj2msgobj(o);
124
125 if (obj_flags & CC770_OBJ_FLAG_RX) {
126 /*
127 * We don't need extra objects for RTR and EFF if
128 * the additional CC770 functions are enabled.
129 */
130 if (priv->control_normal_mode & CTRL_EAF) {
131 if (o > 0)
132 continue;
133 netdev_dbg(dev, "Message object %d for "
134 "RX data, RTR, SFF and EFF\n", mo);
135 } else {
136 netdev_dbg(dev,
137 "Message object %d for RX %s %s\n",
138 mo, obj_flags & CC770_OBJ_FLAG_RTR ?
139 "RTR" : "data",
140 obj_flags & CC770_OBJ_FLAG_EFF ?
141 "EFF" : "SFF");
142 }
143
144 if (obj_flags & CC770_OBJ_FLAG_EFF)
145 msgcfg = MSGCFG_XTD;
146 else
147 msgcfg = 0;
148 if (obj_flags & CC770_OBJ_FLAG_RTR)
149 msgcfg |= MSGCFG_DIR;
150
151 cc770_write_reg(priv, msgobj[mo].config, msgcfg);
152 cc770_write_reg(priv, msgobj[mo].ctrl0,
153 MSGVAL_SET | TXIE_RES |
154 RXIE_SET | INTPND_RES);
155
156 if (obj_flags & CC770_OBJ_FLAG_RTR)
157 cc770_write_reg(priv, msgobj[mo].ctrl1,
158 NEWDAT_RES | CPUUPD_SET |
159 TXRQST_RES | RMTPND_RES);
160 else
161 cc770_write_reg(priv, msgobj[mo].ctrl1,
162 NEWDAT_RES | MSGLST_RES |
163 TXRQST_RES | RMTPND_RES);
164 } else {
165 netdev_dbg(dev, "Message object %d for "
166 "TX data, RTR, SFF and EFF\n", mo);
167
168 cc770_write_reg(priv, msgobj[mo].ctrl1,
169 RMTPND_RES | TXRQST_RES |
170 CPUUPD_RES | NEWDAT_RES);
171 cc770_write_reg(priv, msgobj[mo].ctrl0,
172 MSGVAL_RES | TXIE_RES |
173 RXIE_RES | INTPND_RES);
174 }
175 }
176}
177
178static void disable_all_objs(const struct cc770_priv *priv)
179{
180 int o, mo;
181
182 for (o = 0; o < ARRAY_SIZE(priv->obj_flags); o++) {
183 mo = obj2msgobj(o);
184
185 if (priv->obj_flags[o] & CC770_OBJ_FLAG_RX) {
186 if (o > 0 && priv->control_normal_mode & CTRL_EAF)
187 continue;
188
189 cc770_write_reg(priv, msgobj[mo].ctrl1,
190 NEWDAT_RES | MSGLST_RES |
191 TXRQST_RES | RMTPND_RES);
192 cc770_write_reg(priv, msgobj[mo].ctrl0,
193 MSGVAL_RES | TXIE_RES |
194 RXIE_RES | INTPND_RES);
195 } else {
196 /* Clear message object for send */
197 cc770_write_reg(priv, msgobj[mo].ctrl1,
198 RMTPND_RES | TXRQST_RES |
199 CPUUPD_RES | NEWDAT_RES);
200 cc770_write_reg(priv, msgobj[mo].ctrl0,
201 MSGVAL_RES | TXIE_RES |
202 RXIE_RES | INTPND_RES);
203 }
204 }
205}
206
207static void set_reset_mode(struct net_device *dev)
208{
209 struct cc770_priv *priv = netdev_priv(dev);
210
211 /* Enable configuration and puts chip in bus-off, disable interrupts */
212 cc770_write_reg(priv, control, CTRL_CCE | CTRL_INI);
213
214 priv->can.state = CAN_STATE_STOPPED;
215
216 /* Clear interrupts */
217 cc770_read_reg(priv, interrupt);
218
219 /* Clear status register */
220 cc770_write_reg(priv, status, 0);
221
222 /* Disable all used message objects */
223 disable_all_objs(priv);
224}
225
226static void set_normal_mode(struct net_device *dev)
227{
228 struct cc770_priv *priv = netdev_priv(dev);
229
230 /* Clear interrupts */
231 cc770_read_reg(priv, interrupt);
232
233 /* Clear status register and pre-set last error code */
234 cc770_write_reg(priv, status, STAT_LEC_MASK);
235
236 /* Enable all used message objects*/
237 enable_all_objs(dev);
238
239 /*
240 * Clear bus-off, interrupts only for errors,
241 * not for status change
242 */
243 cc770_write_reg(priv, control, priv->control_normal_mode);
244
245 priv->can.state = CAN_STATE_ERROR_ACTIVE;
246}
247
248static void chipset_init(struct cc770_priv *priv)
249{
250 int mo, id, data;
251
252 /* Enable configuration and put chip in bus-off, disable interrupts */
253 cc770_write_reg(priv, control, (CTRL_CCE | CTRL_INI));
254
255 /* Set CLKOUT divider and slew rates */
256 cc770_write_reg(priv, clkout, priv->clkout);
257
258 /* Configure CPU interface / CLKOUT enable */
259 cc770_write_reg(priv, cpu_interface, priv->cpu_interface);
260
261 /* Set bus configuration */
262 cc770_write_reg(priv, bus_config, priv->bus_config);
263
264 /* Clear interrupts */
265 cc770_read_reg(priv, interrupt);
266
267 /* Clear status register */
268 cc770_write_reg(priv, status, 0);
269
270 /* Clear and invalidate message objects */
271 for (mo = MSGOBJ_FIRST; mo <= MSGOBJ_LAST; mo++) {
272 cc770_write_reg(priv, msgobj[mo].ctrl0,
273 INTPND_UNC | RXIE_RES |
274 TXIE_RES | MSGVAL_RES);
275 cc770_write_reg(priv, msgobj[mo].ctrl0,
276 INTPND_RES | RXIE_RES |
277 TXIE_RES | MSGVAL_RES);
278 cc770_write_reg(priv, msgobj[mo].ctrl1,
279 NEWDAT_RES | MSGLST_RES |
280 TXRQST_RES | RMTPND_RES);
281 for (data = 0; data < 8; data++)
282 cc770_write_reg(priv, msgobj[mo].data[data], 0);
283 for (id = 0; id < 4; id++)
284 cc770_write_reg(priv, msgobj[mo].id[id], 0);
285 cc770_write_reg(priv, msgobj[mo].config, 0);
286 }
287
288 /* Set all global ID masks to "don't care" */
289 cc770_write_reg(priv, global_mask_std[0], 0);
290 cc770_write_reg(priv, global_mask_std[1], 0);
291 cc770_write_reg(priv, global_mask_ext[0], 0);
292 cc770_write_reg(priv, global_mask_ext[1], 0);
293 cc770_write_reg(priv, global_mask_ext[2], 0);
294 cc770_write_reg(priv, global_mask_ext[3], 0);
295
296}
297
298static int cc770_probe_chip(struct net_device *dev)
299{
300 struct cc770_priv *priv = netdev_priv(dev);
301
302 /* Enable configuration, put chip in bus-off, disable ints */
303 cc770_write_reg(priv, control, CTRL_CCE | CTRL_EAF | CTRL_INI);
304 /* Configure cpu interface / CLKOUT disable */
305 cc770_write_reg(priv, cpu_interface, priv->cpu_interface);
306
307 /*
308 * Check if hardware reset is still inactive or maybe there
309 * is no chip in this address space
310 */
311 if (cc770_read_reg(priv, cpu_interface) & CPUIF_RST) {
312 netdev_info(dev, "probing @0x%p failed (reset)\n",
313 priv->reg_base);
314 return -ENODEV;
315 }
316
317 /* Write and read back test pattern (some arbitrary values) */
318 cc770_write_reg(priv, msgobj[1].data[1], 0x25);
319 cc770_write_reg(priv, msgobj[2].data[3], 0x52);
320 cc770_write_reg(priv, msgobj[10].data[6], 0xc3);
321 if ((cc770_read_reg(priv, msgobj[1].data[1]) != 0x25) ||
322 (cc770_read_reg(priv, msgobj[2].data[3]) != 0x52) ||
323 (cc770_read_reg(priv, msgobj[10].data[6]) != 0xc3)) {
324 netdev_info(dev, "probing @0x%p failed (pattern)\n",
325 priv->reg_base);
326 return -ENODEV;
327 }
328
329 /* Check if this chip is a CC770 supporting additional functions */
330 if (cc770_read_reg(priv, control) & CTRL_EAF)
331 priv->control_normal_mode |= CTRL_EAF;
332
333 return 0;
334}
335
336static void cc770_start(struct net_device *dev)
337{
338 struct cc770_priv *priv = netdev_priv(dev);
339
340 /* leave reset mode */
341 if (priv->can.state != CAN_STATE_STOPPED)
342 set_reset_mode(dev);
343
344 /* leave reset mode */
345 set_normal_mode(dev);
346}
347
348static int cc770_set_mode(struct net_device *dev, enum can_mode mode)
349{
350 switch (mode) {
351 case CAN_MODE_START:
352 cc770_start(dev);
353 netif_wake_queue(dev);
354 break;
355
356 default:
357 return -EOPNOTSUPP;
358 }
359
360 return 0;
361}
362
363static int cc770_set_bittiming(struct net_device *dev)
364{
365 struct cc770_priv *priv = netdev_priv(dev);
366 struct can_bittiming *bt = &priv->can.bittiming;
367 u8 btr0, btr1;
368
369 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
370 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
371 (((bt->phase_seg2 - 1) & 0x7) << 4);
372 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
373 btr1 |= 0x80;
374
375 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
376
377 cc770_write_reg(priv, bit_timing_0, btr0);
378 cc770_write_reg(priv, bit_timing_1, btr1);
379
380 return 0;
381}
382
383static int cc770_get_berr_counter(const struct net_device *dev,
384 struct can_berr_counter *bec)
385{
386 struct cc770_priv *priv = netdev_priv(dev);
387
388 bec->txerr = cc770_read_reg(priv, tx_error_counter);
389 bec->rxerr = cc770_read_reg(priv, rx_error_counter);
390
391 return 0;
392}
393
394static netdev_tx_t cc770_start_xmit(struct sk_buff *skb, struct net_device *dev)
395{
396 struct cc770_priv *priv = netdev_priv(dev);
397 struct net_device_stats *stats = &dev->stats;
398 struct can_frame *cf = (struct can_frame *)skb->data;
399 unsigned int mo = obj2msgobj(CC770_OBJ_TX);
400 u8 dlc, rtr;
401 u32 id;
402 int i;
403
404 if (can_dropped_invalid_skb(dev, skb))
405 return NETDEV_TX_OK;
406
407 if ((cc770_read_reg(priv,
408 msgobj[mo].ctrl1) & TXRQST_UNC) == TXRQST_SET) {
409 netdev_err(dev, "TX register is still occupied!\n");
410 return NETDEV_TX_BUSY;
411 }
412
413 netif_stop_queue(dev);
414
415 dlc = cf->can_dlc;
416 id = cf->can_id;
417 if (cf->can_id & CAN_RTR_FLAG)
418 rtr = 0;
419 else
420 rtr = MSGCFG_DIR;
421 cc770_write_reg(priv, msgobj[mo].ctrl1,
422 RMTPND_RES | TXRQST_RES | CPUUPD_SET | NEWDAT_RES);
423 cc770_write_reg(priv, msgobj[mo].ctrl0,
424 MSGVAL_SET | TXIE_SET | RXIE_RES | INTPND_RES);
425 if (id & CAN_EFF_FLAG) {
426 id &= CAN_EFF_MASK;
427 cc770_write_reg(priv, msgobj[mo].config,
428 (dlc << 4) | rtr | MSGCFG_XTD);
429 cc770_write_reg(priv, msgobj[mo].id[3], id << 3);
430 cc770_write_reg(priv, msgobj[mo].id[2], id >> 5);
431 cc770_write_reg(priv, msgobj[mo].id[1], id >> 13);
432 cc770_write_reg(priv, msgobj[mo].id[0], id >> 21);
433 } else {
434 id &= CAN_SFF_MASK;
435 cc770_write_reg(priv, msgobj[mo].config, (dlc << 4) | rtr);
436 cc770_write_reg(priv, msgobj[mo].id[0], id >> 3);
437 cc770_write_reg(priv, msgobj[mo].id[1], id << 5);
438 }
439
440 for (i = 0; i < dlc; i++)
441 cc770_write_reg(priv, msgobj[mo].data[i], cf->data[i]);
442
443 cc770_write_reg(priv, msgobj[mo].ctrl1,
444 RMTPND_RES | TXRQST_SET | CPUUPD_RES | NEWDAT_UNC);
445
446 stats->tx_bytes += dlc;
447
448 can_put_echo_skb(skb, dev, 0);
449
450 /*
451 * HM: We had some cases of repeated IRQs so make sure the
452 * INT is acknowledged I know it's already further up, but
453 * doing again fixed the issue
454 */
455 cc770_write_reg(priv, msgobj[mo].ctrl0,
456 MSGVAL_UNC | TXIE_UNC | RXIE_UNC | INTPND_RES);
457
458 return NETDEV_TX_OK;
459}
460
461static void cc770_rx(struct net_device *dev, unsigned int mo, u8 ctrl1)
462{
463 struct cc770_priv *priv = netdev_priv(dev);
464 struct net_device_stats *stats = &dev->stats;
465 struct can_frame *cf;
466 struct sk_buff *skb;
467 u8 config;
468 u32 id;
469 int i;
470
471 skb = alloc_can_skb(dev, &cf);
472 if (!skb)
473 return;
474
475 config = cc770_read_reg(priv, msgobj[mo].config);
476
477 if (ctrl1 & RMTPND_SET) {
478 /*
479 * Unfortunately, the chip does not store the real message
480 * identifier of the received remote transmission request
481 * frame. Therefore we set it to 0.
482 */
483 cf->can_id = CAN_RTR_FLAG;
484 if (config & MSGCFG_XTD)
485 cf->can_id |= CAN_EFF_FLAG;
486 cf->can_dlc = 0;
487 } else {
488 if (config & MSGCFG_XTD) {
489 id = cc770_read_reg(priv, msgobj[mo].id[3]);
490 id |= cc770_read_reg(priv, msgobj[mo].id[2]) << 8;
491 id |= cc770_read_reg(priv, msgobj[mo].id[1]) << 16;
492 id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 24;
493 id >>= 3;
494 id |= CAN_EFF_FLAG;
495 } else {
496 id = cc770_read_reg(priv, msgobj[mo].id[1]);
497 id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 8;
498 id >>= 5;
499 }
500
501 cf->can_id = id;
502 cf->can_dlc = get_can_dlc((config & 0xf0) >> 4);
503 for (i = 0; i < cf->can_dlc; i++)
504 cf->data[i] = cc770_read_reg(priv, msgobj[mo].data[i]);
505 }
506 netif_rx(skb);
507
508 stats->rx_packets++;
509 stats->rx_bytes += cf->can_dlc;
510}
511
512static int cc770_err(struct net_device *dev, u8 status)
513{
514 struct cc770_priv *priv = netdev_priv(dev);
515 struct net_device_stats *stats = &dev->stats;
516 struct can_frame *cf;
517 struct sk_buff *skb;
518 u8 lec;
519
520 netdev_dbg(dev, "status interrupt (%#x)\n", status);
521
522 skb = alloc_can_err_skb(dev, &cf);
523 if (!skb)
524 return -ENOMEM;
525
526 /* Use extended functions of the CC770 */
527 if (priv->control_normal_mode & CTRL_EAF) {
528 cf->data[6] = cc770_read_reg(priv, tx_error_counter);
529 cf->data[7] = cc770_read_reg(priv, rx_error_counter);
530 }
531
532 if (status & STAT_BOFF) {
533 /* Disable interrupts */
534 cc770_write_reg(priv, control, CTRL_INI);
535 cf->can_id |= CAN_ERR_BUSOFF;
536 priv->can.state = CAN_STATE_BUS_OFF;
537 can_bus_off(dev);
538 } else if (status & STAT_WARN) {
539 cf->can_id |= CAN_ERR_CRTL;
540 /* Only the CC770 does show error passive */
541 if (cf->data[7] > 127) {
542 cf->data[1] = CAN_ERR_CRTL_RX_PASSIVE |
543 CAN_ERR_CRTL_TX_PASSIVE;
544 priv->can.state = CAN_STATE_ERROR_PASSIVE;
545 priv->can.can_stats.error_passive++;
546 } else {
547 cf->data[1] = CAN_ERR_CRTL_RX_WARNING |
548 CAN_ERR_CRTL_TX_WARNING;
549 priv->can.state = CAN_STATE_ERROR_WARNING;
550 priv->can.can_stats.error_warning++;
551 }
552 } else {
553 /* Back to error avtive */
554 cf->can_id |= CAN_ERR_PROT;
555 cf->data[2] = CAN_ERR_PROT_ACTIVE;
556 priv->can.state = CAN_STATE_ERROR_ACTIVE;
557 }
558
559 lec = status & STAT_LEC_MASK;
560 if (lec < 7 && lec > 0) {
561 if (lec == STAT_LEC_ACK) {
562 cf->can_id |= CAN_ERR_ACK;
563 } else {
564 cf->can_id |= CAN_ERR_PROT;
565 switch (lec) {
566 case STAT_LEC_STUFF:
567 cf->data[2] |= CAN_ERR_PROT_STUFF;
568 break;
569 case STAT_LEC_FORM:
570 cf->data[2] |= CAN_ERR_PROT_FORM;
571 break;
572 case STAT_LEC_BIT1:
573 cf->data[2] |= CAN_ERR_PROT_BIT1;
574 break;
575 case STAT_LEC_BIT0:
576 cf->data[2] |= CAN_ERR_PROT_BIT0;
577 break;
578 case STAT_LEC_CRC:
579 cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ;
580 break;
581 }
582 }
583 }
584
585 netif_rx(skb);
586
587 stats->rx_packets++;
588 stats->rx_bytes += cf->can_dlc;
589
590 return 0;
591}
592
593static int cc770_status_interrupt(struct net_device *dev)
594{
595 struct cc770_priv *priv = netdev_priv(dev);
596 u8 status;
597
598 status = cc770_read_reg(priv, status);
599 /* Reset the status register including RXOK and TXOK */
600 cc770_write_reg(priv, status, STAT_LEC_MASK);
601
602 if (status & (STAT_WARN | STAT_BOFF) ||
603 (status & STAT_LEC_MASK) != STAT_LEC_MASK) {
604 cc770_err(dev, status);
605 return status & STAT_BOFF;
606 }
607
608 return 0;
609}
610
611static void cc770_rx_interrupt(struct net_device *dev, unsigned int o)
612{
613 struct cc770_priv *priv = netdev_priv(dev);
614 struct net_device_stats *stats = &dev->stats;
615 unsigned int mo = obj2msgobj(o);
616 u8 ctrl1;
617 int n = CC770_MAX_MSG;
618
619 while (n--) {
620 ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1);
621
622 if (!(ctrl1 & NEWDAT_SET)) {
623 /* Check for RTR if additional functions are enabled */
624 if (priv->control_normal_mode & CTRL_EAF) {
625 if (!(cc770_read_reg(priv, msgobj[mo].ctrl0) &
626 INTPND_SET))
627 break;
628 } else {
629 break;
630 }
631 }
632
633 if (ctrl1 & MSGLST_SET) {
634 stats->rx_over_errors++;
635 stats->rx_errors++;
636 }
637 if (mo < MSGOBJ_LAST)
638 cc770_write_reg(priv, msgobj[mo].ctrl1,
639 NEWDAT_RES | MSGLST_RES |
640 TXRQST_UNC | RMTPND_UNC);
641 cc770_rx(dev, mo, ctrl1);
642
643 cc770_write_reg(priv, msgobj[mo].ctrl0,
644 MSGVAL_SET | TXIE_RES |
645 RXIE_SET | INTPND_RES);
646 cc770_write_reg(priv, msgobj[mo].ctrl1,
647 NEWDAT_RES | MSGLST_RES |
648 TXRQST_RES | RMTPND_RES);
649 }
650}
651
652static void cc770_rtr_interrupt(struct net_device *dev, unsigned int o)
653{
654 struct cc770_priv *priv = netdev_priv(dev);
655 unsigned int mo = obj2msgobj(o);
656 u8 ctrl0, ctrl1;
657 int n = CC770_MAX_MSG;
658
659 while (n--) {
660 ctrl0 = cc770_read_reg(priv, msgobj[mo].ctrl0);
661 if (!(ctrl0 & INTPND_SET))
662 break;
663
664 ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1);
665 cc770_rx(dev, mo, ctrl1);
666
667 cc770_write_reg(priv, msgobj[mo].ctrl0,
668 MSGVAL_SET | TXIE_RES |
669 RXIE_SET | INTPND_RES);
670 cc770_write_reg(priv, msgobj[mo].ctrl1,
671 NEWDAT_RES | CPUUPD_SET |
672 TXRQST_RES | RMTPND_RES);
673 }
674}
675
676static void cc770_tx_interrupt(struct net_device *dev, unsigned int o)
677{
678 struct cc770_priv *priv = netdev_priv(dev);
679 struct net_device_stats *stats = &dev->stats;
680 unsigned int mo = obj2msgobj(o);
681
682 /* Nothing more to send, switch off interrupts */
683 cc770_write_reg(priv, msgobj[mo].ctrl0,
684 MSGVAL_RES | TXIE_RES | RXIE_RES | INTPND_RES);
685 /*
686 * We had some cases of repeated IRQ so make sure the
687 * INT is acknowledged
688 */
689 cc770_write_reg(priv, msgobj[mo].ctrl0,
690 MSGVAL_UNC | TXIE_UNC | RXIE_UNC | INTPND_RES);
691
692 stats->tx_packets++;
693 can_get_echo_skb(dev, 0);
694 netif_wake_queue(dev);
695}
696
697irqreturn_t cc770_interrupt(int irq, void *dev_id)
698{
699 struct net_device *dev = (struct net_device *)dev_id;
700 struct cc770_priv *priv = netdev_priv(dev);
701 u8 intid;
702 int o, n = 0;
703
704 /* Shared interrupts and IRQ off? */
705 if (priv->can.state == CAN_STATE_STOPPED)
706 return IRQ_NONE;
707
708 if (priv->pre_irq)
709 priv->pre_irq(priv);
710
711 while (n < CC770_MAX_IRQ) {
712 /* Read the highest pending interrupt request */
713 intid = cc770_read_reg(priv, interrupt);
714 if (!intid)
715 break;
716 n++;
717
718 if (intid == 1) {
719 /* Exit in case of bus-off */
720 if (cc770_status_interrupt(dev))
721 break;
722 } else {
723 o = intid2obj(intid);
724
725 if (o >= CC770_OBJ_MAX) {
726 netdev_err(dev, "Unexpected interrupt id %d\n",
727 intid);
728 continue;
729 }
730
731 if (priv->obj_flags[o] & CC770_OBJ_FLAG_RTR)
732 cc770_rtr_interrupt(dev, o);
733 else if (priv->obj_flags[o] & CC770_OBJ_FLAG_RX)
734 cc770_rx_interrupt(dev, o);
735 else
736 cc770_tx_interrupt(dev, o);
737 }
738 }
739
740 if (priv->post_irq)
741 priv->post_irq(priv);
742
743 if (n >= CC770_MAX_IRQ)
744 netdev_dbg(dev, "%d messages handled in ISR", n);
745
746 return (n) ? IRQ_HANDLED : IRQ_NONE;
747}
748
749static int cc770_open(struct net_device *dev)
750{
751 struct cc770_priv *priv = netdev_priv(dev);
752 int err;
753
754 /* set chip into reset mode */
755 set_reset_mode(dev);
756
757 /* common open */
758 err = open_candev(dev);
759 if (err)
760 return err;
761
762 err = request_irq(dev->irq, &cc770_interrupt, priv->irq_flags,
763 dev->name, dev);
764 if (err) {
765 close_candev(dev);
766 return -EAGAIN;
767 }
768
769 /* init and start chip */
770 cc770_start(dev);
771
772 netif_start_queue(dev);
773
774 return 0;
775}
776
777static int cc770_close(struct net_device *dev)
778{
779 netif_stop_queue(dev);
780 set_reset_mode(dev);
781
782 free_irq(dev->irq, dev);
783 close_candev(dev);
784
785 return 0;
786}
787
788struct net_device *alloc_cc770dev(int sizeof_priv)
789{
790 struct net_device *dev;
791 struct cc770_priv *priv;
792
793 dev = alloc_candev(sizeof(struct cc770_priv) + sizeof_priv,
794 CC770_ECHO_SKB_MAX);
795 if (!dev)
796 return NULL;
797
798 priv = netdev_priv(dev);
799
800 priv->dev = dev;
801 priv->can.bittiming_const = &cc770_bittiming_const;
802 priv->can.do_set_bittiming = cc770_set_bittiming;
803 priv->can.do_set_mode = cc770_set_mode;
804 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
805
806 memcpy(priv->obj_flags, cc770_obj_flags, sizeof(cc770_obj_flags));
807
808 if (sizeof_priv)
809 priv->priv = (void *)priv + sizeof(struct cc770_priv);
810
811 return dev;
812}
813EXPORT_SYMBOL_GPL(alloc_cc770dev);
814
815void free_cc770dev(struct net_device *dev)
816{
817 free_candev(dev);
818}
819EXPORT_SYMBOL_GPL(free_cc770dev);
820
821static const struct net_device_ops cc770_netdev_ops = {
822 .ndo_open = cc770_open,
823 .ndo_stop = cc770_close,
824 .ndo_start_xmit = cc770_start_xmit,
825};
826
827int register_cc770dev(struct net_device *dev)
828{
829 struct cc770_priv *priv = netdev_priv(dev);
830 int err;
831
832 err = cc770_probe_chip(dev);
833 if (err)
834 return err;
835
836 dev->netdev_ops = &cc770_netdev_ops;
837
838 dev->flags |= IFF_ECHO; /* we support local echo */
839
840 /* Should we use additional functions? */
841 if (!i82527_compat && priv->control_normal_mode & CTRL_EAF) {
842 priv->can.do_get_berr_counter = cc770_get_berr_counter;
843 priv->control_normal_mode = CTRL_IE | CTRL_EAF | CTRL_EIE;
844 netdev_dbg(dev, "i82527 mode with additional functions\n");
845 } else {
846 priv->control_normal_mode = CTRL_IE | CTRL_EIE;
847 netdev_dbg(dev, "strict i82527 compatibility mode\n");
848 }
849
850 chipset_init(priv);
851 set_reset_mode(dev);
852
853 return register_candev(dev);
854}
855EXPORT_SYMBOL_GPL(register_cc770dev);
856
857void unregister_cc770dev(struct net_device *dev)
858{
859 set_reset_mode(dev);
860 unregister_candev(dev);
861}
862EXPORT_SYMBOL_GPL(unregister_cc770dev);
863
864static __init int cc770_init(void)
865{
866 if (msgobj15_eff) {
867 cc770_obj_flags[CC770_OBJ_RX0] |= CC770_OBJ_FLAG_EFF;
868 cc770_obj_flags[CC770_OBJ_RX1] &= ~CC770_OBJ_FLAG_EFF;
869 }
870
871 pr_info("CAN netdevice driver\n");
872
873 return 0;
874}
875module_init(cc770_init);
876
877static __exit void cc770_exit(void)
878{
879 pr_info("driver removed\n");
880}
881module_exit(cc770_exit);
Linux kernel - Deliverables
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