1 // SPDX-License-Identifier: GPL-2.0-only
3 * Core driver for the CC770 and AN82527 CAN controllers
5 * Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com>
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/sched.h>
14 #include <linux/types.h>
15 #include <linux/fcntl.h>
16 #include <linux/interrupt.h>
17 #include <linux/ptrace.h>
18 #include <linux/string.h>
19 #include <linux/errno.h>
20 #include <linux/netdevice.h>
21 #include <linux/if_arp.h>
22 #include <linux/if_ether.h>
23 #include <linux/skbuff.h>
24 #include <linux/delay.h>
26 #include <linux/can.h>
27 #include <linux/can/dev.h>
28 #include <linux/can/error.h>
29 #include <linux/can/platform/cc770.h>
33 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
34 MODULE_LICENSE("GPL v2");
35 MODULE_DESCRIPTION(KBUILD_MODNAME "CAN netdevice driver");
38 * The CC770 is a CAN controller from Bosch, which is 100% compatible
39 * with the AN82527 from Intel, but with "bugs" being fixed and some
40 * additional functionality, mainly:
42 * 1. RX and TX error counters are readable.
43 * 2. Support of silent (listen-only) mode.
44 * 3. Message object 15 can receive all types of frames, also RTR and EFF.
46 * Details are available from Bosch's "CC770_Product_Info_2007-01.pdf",
47 * which explains in detail the compatibility between the CC770 and the
48 * 82527. This driver use the additional functionality 3. on real CC770
49 * devices. Unfortunately, the CC770 does still not store the message
50 * identifier of received remote transmission request frames and
51 * therefore it's set to 0.
53 * The message objects 1..14 can be used for TX and RX while the message
54 * objects 15 is optimized for RX. It has a shadow register for reliable
55 * data reception under heavy bus load. Therefore it makes sense to use
56 * this message object for the needed use case. The frame type (EFF/SFF)
57 * for the message object 15 can be defined via kernel module parameter
58 * "msgobj15_eff". If not equal 0, it will receive 29-bit EFF frames,
59 * otherwise 11 bit SFF messages.
61 static int msgobj15_eff;
62 module_param(msgobj15_eff, int, 0444);
63 MODULE_PARM_DESC(msgobj15_eff, "Extended 29-bit frames for message object 15 "
64 "(default: 11-bit standard frames)");
66 static int i82527_compat;
67 module_param(i82527_compat, int, 0444);
68 MODULE_PARM_DESC(i82527_compat, "Strict Intel 82527 compatibility mode "
69 "without using additional functions");
72 * This driver uses the last 5 message objects 11..15. The definitions
73 * and structure below allows to configure and assign them to the real
76 static unsigned char cc770_obj_flags[CC770_OBJ_MAX] = {
77 [CC770_OBJ_RX0] = CC770_OBJ_FLAG_RX,
78 [CC770_OBJ_RX1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_EFF,
79 [CC770_OBJ_RX_RTR0] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR,
80 [CC770_OBJ_RX_RTR1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR |
85 static const struct can_bittiming_const cc770_bittiming_const = {
86 .name = KBUILD_MODNAME,
97 static inline int intid2obj(unsigned int intid)
102 return MSGOBJ_LAST + 2 - intid;
105 static void enable_all_objs(const struct net_device *dev)
107 struct cc770_priv *priv = netdev_priv(dev);
109 unsigned char obj_flags;
112 for (o = 0; o < ARRAY_SIZE(priv->obj_flags); o++) {
113 obj_flags = priv->obj_flags[o];
116 if (obj_flags & CC770_OBJ_FLAG_RX) {
118 * We don't need extra objects for RTR and EFF if
119 * the additional CC770 functions are enabled.
121 if (priv->control_normal_mode & CTRL_EAF) {
124 netdev_dbg(dev, "Message object %d for "
125 "RX data, RTR, SFF and EFF\n", mo);
128 "Message object %d for RX %s %s\n",
129 mo, obj_flags & CC770_OBJ_FLAG_RTR ?
131 obj_flags & CC770_OBJ_FLAG_EFF ?
135 if (obj_flags & CC770_OBJ_FLAG_EFF)
139 if (obj_flags & CC770_OBJ_FLAG_RTR)
140 msgcfg |= MSGCFG_DIR;
142 cc770_write_reg(priv, msgobj[mo].config, msgcfg);
143 cc770_write_reg(priv, msgobj[mo].ctrl0,
144 MSGVAL_SET | TXIE_RES |
145 RXIE_SET | INTPND_RES);
147 if (obj_flags & CC770_OBJ_FLAG_RTR)
148 cc770_write_reg(priv, msgobj[mo].ctrl1,
149 NEWDAT_RES | CPUUPD_SET |
150 TXRQST_RES | RMTPND_RES);
152 cc770_write_reg(priv, msgobj[mo].ctrl1,
153 NEWDAT_RES | MSGLST_RES |
154 TXRQST_RES | RMTPND_RES);
156 netdev_dbg(dev, "Message object %d for "
157 "TX data, RTR, SFF and EFF\n", mo);
159 cc770_write_reg(priv, msgobj[mo].ctrl1,
160 RMTPND_RES | TXRQST_RES |
161 CPUUPD_RES | NEWDAT_RES);
162 cc770_write_reg(priv, msgobj[mo].ctrl0,
163 MSGVAL_RES | TXIE_RES |
164 RXIE_RES | INTPND_RES);
169 static void disable_all_objs(const struct cc770_priv *priv)
173 for (o = 0; o < ARRAY_SIZE(priv->obj_flags); o++) {
176 if (priv->obj_flags[o] & CC770_OBJ_FLAG_RX) {
177 if (o > 0 && priv->control_normal_mode & CTRL_EAF)
180 cc770_write_reg(priv, msgobj[mo].ctrl1,
181 NEWDAT_RES | MSGLST_RES |
182 TXRQST_RES | RMTPND_RES);
183 cc770_write_reg(priv, msgobj[mo].ctrl0,
184 MSGVAL_RES | TXIE_RES |
185 RXIE_RES | INTPND_RES);
187 /* Clear message object for send */
188 cc770_write_reg(priv, msgobj[mo].ctrl1,
189 RMTPND_RES | TXRQST_RES |
190 CPUUPD_RES | NEWDAT_RES);
191 cc770_write_reg(priv, msgobj[mo].ctrl0,
192 MSGVAL_RES | TXIE_RES |
193 RXIE_RES | INTPND_RES);
198 static void set_reset_mode(struct net_device *dev)
200 struct cc770_priv *priv = netdev_priv(dev);
202 /* Enable configuration and puts chip in bus-off, disable interrupts */
203 cc770_write_reg(priv, control, CTRL_CCE | CTRL_INI);
205 priv->can.state = CAN_STATE_STOPPED;
207 /* Clear interrupts */
208 cc770_read_reg(priv, interrupt);
210 /* Clear status register */
211 cc770_write_reg(priv, status, 0);
213 /* Disable all used message objects */
214 disable_all_objs(priv);
217 static void set_normal_mode(struct net_device *dev)
219 struct cc770_priv *priv = netdev_priv(dev);
221 /* Clear interrupts */
222 cc770_read_reg(priv, interrupt);
224 /* Clear status register and pre-set last error code */
225 cc770_write_reg(priv, status, STAT_LEC_MASK);
227 /* Enable all used message objects*/
228 enable_all_objs(dev);
231 * Clear bus-off, interrupts only for errors,
232 * not for status change
234 cc770_write_reg(priv, control, priv->control_normal_mode);
236 priv->can.state = CAN_STATE_ERROR_ACTIVE;
239 static void chipset_init(struct cc770_priv *priv)
243 /* Enable configuration and put chip in bus-off, disable interrupts */
244 cc770_write_reg(priv, control, (CTRL_CCE | CTRL_INI));
246 /* Set CLKOUT divider and slew rates */
247 cc770_write_reg(priv, clkout, priv->clkout);
249 /* Configure CPU interface / CLKOUT enable */
250 cc770_write_reg(priv, cpu_interface, priv->cpu_interface);
252 /* Set bus configuration */
253 cc770_write_reg(priv, bus_config, priv->bus_config);
255 /* Clear interrupts */
256 cc770_read_reg(priv, interrupt);
258 /* Clear status register */
259 cc770_write_reg(priv, status, 0);
261 /* Clear and invalidate message objects */
262 for (mo = MSGOBJ_FIRST; mo <= MSGOBJ_LAST; mo++) {
263 cc770_write_reg(priv, msgobj[mo].ctrl0,
264 INTPND_UNC | RXIE_RES |
265 TXIE_RES | MSGVAL_RES);
266 cc770_write_reg(priv, msgobj[mo].ctrl0,
267 INTPND_RES | RXIE_RES |
268 TXIE_RES | MSGVAL_RES);
269 cc770_write_reg(priv, msgobj[mo].ctrl1,
270 NEWDAT_RES | MSGLST_RES |
271 TXRQST_RES | RMTPND_RES);
272 for (data = 0; data < 8; data++)
273 cc770_write_reg(priv, msgobj[mo].data[data], 0);
274 for (id = 0; id < 4; id++)
275 cc770_write_reg(priv, msgobj[mo].id[id], 0);
276 cc770_write_reg(priv, msgobj[mo].config, 0);
279 /* Set all global ID masks to "don't care" */
280 cc770_write_reg(priv, global_mask_std[0], 0);
281 cc770_write_reg(priv, global_mask_std[1], 0);
282 cc770_write_reg(priv, global_mask_ext[0], 0);
283 cc770_write_reg(priv, global_mask_ext[1], 0);
284 cc770_write_reg(priv, global_mask_ext[2], 0);
285 cc770_write_reg(priv, global_mask_ext[3], 0);
289 static int cc770_probe_chip(struct net_device *dev)
291 struct cc770_priv *priv = netdev_priv(dev);
293 /* Enable configuration, put chip in bus-off, disable ints */
294 cc770_write_reg(priv, control, CTRL_CCE | CTRL_EAF | CTRL_INI);
295 /* Configure cpu interface / CLKOUT disable */
296 cc770_write_reg(priv, cpu_interface, priv->cpu_interface);
299 * Check if hardware reset is still inactive or maybe there
300 * is no chip in this address space
302 if (cc770_read_reg(priv, cpu_interface) & CPUIF_RST) {
303 netdev_info(dev, "probing @0x%p failed (reset)\n",
308 /* Write and read back test pattern (some arbitrary values) */
309 cc770_write_reg(priv, msgobj[1].data[1], 0x25);
310 cc770_write_reg(priv, msgobj[2].data[3], 0x52);
311 cc770_write_reg(priv, msgobj[10].data[6], 0xc3);
312 if ((cc770_read_reg(priv, msgobj[1].data[1]) != 0x25) ||
313 (cc770_read_reg(priv, msgobj[2].data[3]) != 0x52) ||
314 (cc770_read_reg(priv, msgobj[10].data[6]) != 0xc3)) {
315 netdev_info(dev, "probing @0x%p failed (pattern)\n",
320 /* Check if this chip is a CC770 supporting additional functions */
321 if (cc770_read_reg(priv, control) & CTRL_EAF)
322 priv->control_normal_mode |= CTRL_EAF;
327 static void cc770_start(struct net_device *dev)
329 struct cc770_priv *priv = netdev_priv(dev);
331 /* leave reset mode */
332 if (priv->can.state != CAN_STATE_STOPPED)
335 /* leave reset mode */
336 set_normal_mode(dev);
339 static int cc770_set_mode(struct net_device *dev, enum can_mode mode)
344 netif_wake_queue(dev);
354 static int cc770_set_bittiming(struct net_device *dev)
356 struct cc770_priv *priv = netdev_priv(dev);
357 struct can_bittiming *bt = &priv->can.bittiming;
360 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
361 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
362 (((bt->phase_seg2 - 1) & 0x7) << 4);
363 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
366 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
368 cc770_write_reg(priv, bit_timing_0, btr0);
369 cc770_write_reg(priv, bit_timing_1, btr1);
374 static int cc770_get_berr_counter(const struct net_device *dev,
375 struct can_berr_counter *bec)
377 struct cc770_priv *priv = netdev_priv(dev);
379 bec->txerr = cc770_read_reg(priv, tx_error_counter);
380 bec->rxerr = cc770_read_reg(priv, rx_error_counter);
385 static void cc770_tx(struct net_device *dev, int mo)
387 struct cc770_priv *priv = netdev_priv(dev);
388 struct can_frame *cf = (struct can_frame *)priv->tx_skb->data;
395 rtr = cf->can_id & CAN_RTR_FLAG ? 0 : MSGCFG_DIR;
397 cc770_write_reg(priv, msgobj[mo].ctrl0,
398 MSGVAL_RES | TXIE_RES | RXIE_RES | INTPND_RES);
399 cc770_write_reg(priv, msgobj[mo].ctrl1,
400 RMTPND_RES | TXRQST_RES | CPUUPD_SET | NEWDAT_RES);
402 if (id & CAN_EFF_FLAG) {
404 cc770_write_reg(priv, msgobj[mo].config,
405 (dlc << 4) | rtr | MSGCFG_XTD);
406 cc770_write_reg(priv, msgobj[mo].id[3], id << 3);
407 cc770_write_reg(priv, msgobj[mo].id[2], id >> 5);
408 cc770_write_reg(priv, msgobj[mo].id[1], id >> 13);
409 cc770_write_reg(priv, msgobj[mo].id[0], id >> 21);
412 cc770_write_reg(priv, msgobj[mo].config, (dlc << 4) | rtr);
413 cc770_write_reg(priv, msgobj[mo].id[0], id >> 3);
414 cc770_write_reg(priv, msgobj[mo].id[1], id << 5);
417 for (i = 0; i < dlc; i++)
418 cc770_write_reg(priv, msgobj[mo].data[i], cf->data[i]);
420 cc770_write_reg(priv, msgobj[mo].ctrl1,
421 RMTPND_UNC | TXRQST_SET | CPUUPD_RES | NEWDAT_UNC);
422 cc770_write_reg(priv, msgobj[mo].ctrl0,
423 MSGVAL_SET | TXIE_SET | RXIE_SET | INTPND_UNC);
426 static netdev_tx_t cc770_start_xmit(struct sk_buff *skb, struct net_device *dev)
428 struct cc770_priv *priv = netdev_priv(dev);
429 unsigned int mo = obj2msgobj(CC770_OBJ_TX);
431 if (can_dropped_invalid_skb(dev, skb))
434 netif_stop_queue(dev);
436 if ((cc770_read_reg(priv,
437 msgobj[mo].ctrl1) & TXRQST_UNC) == TXRQST_SET) {
438 netdev_err(dev, "TX register is still occupied!\n");
439 return NETDEV_TX_BUSY;
448 static void cc770_rx(struct net_device *dev, unsigned int mo, u8 ctrl1)
450 struct cc770_priv *priv = netdev_priv(dev);
451 struct net_device_stats *stats = &dev->stats;
452 struct can_frame *cf;
458 skb = alloc_can_skb(dev, &cf);
462 config = cc770_read_reg(priv, msgobj[mo].config);
464 if (ctrl1 & RMTPND_SET) {
466 * Unfortunately, the chip does not store the real message
467 * identifier of the received remote transmission request
468 * frame. Therefore we set it to 0.
470 cf->can_id = CAN_RTR_FLAG;
471 if (config & MSGCFG_XTD)
472 cf->can_id |= CAN_EFF_FLAG;
475 if (config & MSGCFG_XTD) {
476 id = cc770_read_reg(priv, msgobj[mo].id[3]);
477 id |= cc770_read_reg(priv, msgobj[mo].id[2]) << 8;
478 id |= cc770_read_reg(priv, msgobj[mo].id[1]) << 16;
479 id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 24;
483 id = cc770_read_reg(priv, msgobj[mo].id[1]);
484 id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 8;
489 cf->len = can_cc_dlc2len((config & 0xf0) >> 4);
490 for (i = 0; i < cf->len; i++)
491 cf->data[i] = cc770_read_reg(priv, msgobj[mo].data[i]);
493 stats->rx_bytes += cf->len;
500 static int cc770_err(struct net_device *dev, u8 status)
502 struct cc770_priv *priv = netdev_priv(dev);
503 struct can_frame *cf;
507 netdev_dbg(dev, "status interrupt (%#x)\n", status);
509 skb = alloc_can_err_skb(dev, &cf);
513 /* Use extended functions of the CC770 */
514 if (priv->control_normal_mode & CTRL_EAF) {
515 cf->data[6] = cc770_read_reg(priv, tx_error_counter);
516 cf->data[7] = cc770_read_reg(priv, rx_error_counter);
519 if (status & STAT_BOFF) {
520 /* Disable interrupts */
521 cc770_write_reg(priv, control, CTRL_INI);
522 cf->can_id |= CAN_ERR_BUSOFF;
523 priv->can.state = CAN_STATE_BUS_OFF;
524 priv->can.can_stats.bus_off++;
526 } else if (status & STAT_WARN) {
527 cf->can_id |= CAN_ERR_CRTL;
528 /* Only the CC770 does show error passive */
529 if (cf->data[7] > 127) {
530 cf->data[1] = CAN_ERR_CRTL_RX_PASSIVE |
531 CAN_ERR_CRTL_TX_PASSIVE;
532 priv->can.state = CAN_STATE_ERROR_PASSIVE;
533 priv->can.can_stats.error_passive++;
535 cf->data[1] = CAN_ERR_CRTL_RX_WARNING |
536 CAN_ERR_CRTL_TX_WARNING;
537 priv->can.state = CAN_STATE_ERROR_WARNING;
538 priv->can.can_stats.error_warning++;
541 /* Back to error active */
542 cf->can_id |= CAN_ERR_PROT;
543 cf->data[2] = CAN_ERR_PROT_ACTIVE;
544 priv->can.state = CAN_STATE_ERROR_ACTIVE;
547 lec = status & STAT_LEC_MASK;
548 if (lec < 7 && lec > 0) {
549 if (lec == STAT_LEC_ACK) {
550 cf->can_id |= CAN_ERR_ACK;
552 cf->can_id |= CAN_ERR_PROT;
555 cf->data[2] |= CAN_ERR_PROT_STUFF;
558 cf->data[2] |= CAN_ERR_PROT_FORM;
561 cf->data[2] |= CAN_ERR_PROT_BIT1;
564 cf->data[2] |= CAN_ERR_PROT_BIT0;
567 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
579 static int cc770_status_interrupt(struct net_device *dev)
581 struct cc770_priv *priv = netdev_priv(dev);
584 status = cc770_read_reg(priv, status);
585 /* Reset the status register including RXOK and TXOK */
586 cc770_write_reg(priv, status, STAT_LEC_MASK);
588 if (status & (STAT_WARN | STAT_BOFF) ||
589 (status & STAT_LEC_MASK) != STAT_LEC_MASK) {
590 cc770_err(dev, status);
591 return status & STAT_BOFF;
597 static void cc770_rx_interrupt(struct net_device *dev, unsigned int o)
599 struct cc770_priv *priv = netdev_priv(dev);
600 struct net_device_stats *stats = &dev->stats;
601 unsigned int mo = obj2msgobj(o);
603 int n = CC770_MAX_MSG;
606 ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1);
608 if (!(ctrl1 & NEWDAT_SET)) {
609 /* Check for RTR if additional functions are enabled */
610 if (priv->control_normal_mode & CTRL_EAF) {
611 if (!(cc770_read_reg(priv, msgobj[mo].ctrl0) &
619 if (ctrl1 & MSGLST_SET) {
620 stats->rx_over_errors++;
623 if (mo < MSGOBJ_LAST)
624 cc770_write_reg(priv, msgobj[mo].ctrl1,
625 NEWDAT_RES | MSGLST_RES |
626 TXRQST_UNC | RMTPND_UNC);
627 cc770_rx(dev, mo, ctrl1);
629 cc770_write_reg(priv, msgobj[mo].ctrl0,
630 MSGVAL_SET | TXIE_RES |
631 RXIE_SET | INTPND_RES);
632 cc770_write_reg(priv, msgobj[mo].ctrl1,
633 NEWDAT_RES | MSGLST_RES |
634 TXRQST_RES | RMTPND_RES);
638 static void cc770_rtr_interrupt(struct net_device *dev, unsigned int o)
640 struct cc770_priv *priv = netdev_priv(dev);
641 unsigned int mo = obj2msgobj(o);
643 int n = CC770_MAX_MSG;
646 ctrl0 = cc770_read_reg(priv, msgobj[mo].ctrl0);
647 if (!(ctrl0 & INTPND_SET))
650 ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1);
651 cc770_rx(dev, mo, ctrl1);
653 cc770_write_reg(priv, msgobj[mo].ctrl0,
654 MSGVAL_SET | TXIE_RES |
655 RXIE_SET | INTPND_RES);
656 cc770_write_reg(priv, msgobj[mo].ctrl1,
657 NEWDAT_RES | CPUUPD_SET |
658 TXRQST_RES | RMTPND_RES);
662 static void cc770_tx_interrupt(struct net_device *dev, unsigned int o)
664 struct cc770_priv *priv = netdev_priv(dev);
665 struct net_device_stats *stats = &dev->stats;
666 unsigned int mo = obj2msgobj(o);
669 ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1);
671 cc770_write_reg(priv, msgobj[mo].ctrl0,
672 MSGVAL_RES | TXIE_RES | RXIE_RES | INTPND_RES);
673 cc770_write_reg(priv, msgobj[mo].ctrl1,
674 RMTPND_RES | TXRQST_RES | MSGLST_RES | NEWDAT_RES);
676 if (unlikely(!priv->tx_skb)) {
677 netdev_err(dev, "missing tx skb in tx interrupt\n");
681 if (unlikely(ctrl1 & MSGLST_SET)) {
682 stats->rx_over_errors++;
686 /* When the CC770 is sending an RTR message and it receives a regular
687 * message that matches the id of the RTR message, it will overwrite the
688 * outgoing message in the TX register. When this happens we must
689 * process the received message and try to transmit the outgoing skb
692 if (unlikely(ctrl1 & NEWDAT_SET)) {
693 cc770_rx(dev, mo, ctrl1);
698 can_put_echo_skb(priv->tx_skb, dev, 0, 0);
699 stats->tx_bytes += can_get_echo_skb(dev, 0, NULL);
703 netif_wake_queue(dev);
706 static irqreturn_t cc770_interrupt(int irq, void *dev_id)
708 struct net_device *dev = (struct net_device *)dev_id;
709 struct cc770_priv *priv = netdev_priv(dev);
713 /* Shared interrupts and IRQ off? */
714 if (priv->can.state == CAN_STATE_STOPPED)
720 while (n < CC770_MAX_IRQ) {
721 /* Read the highest pending interrupt request */
722 intid = cc770_read_reg(priv, interrupt);
728 /* Exit in case of bus-off */
729 if (cc770_status_interrupt(dev))
732 o = intid2obj(intid);
734 if (o >= CC770_OBJ_MAX) {
735 netdev_err(dev, "Unexpected interrupt id %d\n",
740 if (priv->obj_flags[o] & CC770_OBJ_FLAG_RTR)
741 cc770_rtr_interrupt(dev, o);
742 else if (priv->obj_flags[o] & CC770_OBJ_FLAG_RX)
743 cc770_rx_interrupt(dev, o);
745 cc770_tx_interrupt(dev, o);
750 priv->post_irq(priv);
752 if (n >= CC770_MAX_IRQ)
753 netdev_dbg(dev, "%d messages handled in ISR", n);
755 return (n) ? IRQ_HANDLED : IRQ_NONE;
758 static int cc770_open(struct net_device *dev)
760 struct cc770_priv *priv = netdev_priv(dev);
763 /* set chip into reset mode */
767 err = open_candev(dev);
771 err = request_irq(dev->irq, &cc770_interrupt, priv->irq_flags,
778 /* init and start chip */
781 netif_start_queue(dev);
786 static int cc770_close(struct net_device *dev)
788 netif_stop_queue(dev);
791 free_irq(dev->irq, dev);
797 struct net_device *alloc_cc770dev(int sizeof_priv)
799 struct net_device *dev;
800 struct cc770_priv *priv;
802 dev = alloc_candev(sizeof(struct cc770_priv) + sizeof_priv,
807 priv = netdev_priv(dev);
810 priv->can.bittiming_const = &cc770_bittiming_const;
811 priv->can.do_set_bittiming = cc770_set_bittiming;
812 priv->can.do_set_mode = cc770_set_mode;
813 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
816 memcpy(priv->obj_flags, cc770_obj_flags, sizeof(cc770_obj_flags));
819 priv->priv = (void *)priv + sizeof(struct cc770_priv);
823 EXPORT_SYMBOL_GPL(alloc_cc770dev);
825 void free_cc770dev(struct net_device *dev)
829 EXPORT_SYMBOL_GPL(free_cc770dev);
831 static const struct net_device_ops cc770_netdev_ops = {
832 .ndo_open = cc770_open,
833 .ndo_stop = cc770_close,
834 .ndo_start_xmit = cc770_start_xmit,
835 .ndo_change_mtu = can_change_mtu,
838 int register_cc770dev(struct net_device *dev)
840 struct cc770_priv *priv = netdev_priv(dev);
843 err = cc770_probe_chip(dev);
847 dev->netdev_ops = &cc770_netdev_ops;
849 dev->flags |= IFF_ECHO; /* we support local echo */
851 /* Should we use additional functions? */
852 if (!i82527_compat && priv->control_normal_mode & CTRL_EAF) {
853 priv->can.do_get_berr_counter = cc770_get_berr_counter;
854 priv->control_normal_mode = CTRL_IE | CTRL_EAF | CTRL_EIE;
855 netdev_dbg(dev, "i82527 mode with additional functions\n");
857 priv->control_normal_mode = CTRL_IE | CTRL_EIE;
858 netdev_dbg(dev, "strict i82527 compatibility mode\n");
864 return register_candev(dev);
866 EXPORT_SYMBOL_GPL(register_cc770dev);
868 void unregister_cc770dev(struct net_device *dev)
871 unregister_candev(dev);
873 EXPORT_SYMBOL_GPL(unregister_cc770dev);
875 static __init int cc770_init(void)
878 cc770_obj_flags[CC770_OBJ_RX0] |= CC770_OBJ_FLAG_EFF;
879 cc770_obj_flags[CC770_OBJ_RX1] &= ~CC770_OBJ_FLAG_EFF;
882 pr_info("CAN netdevice driver\n");
886 module_init(cc770_init);
888 static __exit void cc770_exit(void)
890 pr_info("driver removed\n");
892 module_exit(cc770_exit);