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[mirror_ubuntu-jammy-kernel.git] / drivers / net / can / usb / ems_usb.c
CommitLineData
702171ad
SH		 1/*
2 * CAN driver for EMS Dr. Thomas Wuensche CPC-USB/ARM7
3 *
4 * Copyright (C) 2004-2009 EMS Dr. Thomas Wuensche
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published
8 * by the Free Software Foundation; version 2 of the License.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19#include <linux/init.h>
20#include <linux/signal.h>
21#include <linux/slab.h>
22#include <linux/module.h>
23#include <linux/netdevice.h>
24#include <linux/usb.h>
25
26#include <linux/can.h>
27#include <linux/can/dev.h>
28#include <linux/can/error.h>
29
30MODULE_AUTHOR("Sebastian Haas <haas@ems-wuensche.com>");
31MODULE_DESCRIPTION("CAN driver for EMS Dr. Thomas Wuensche CAN/USB interfaces");
32MODULE_LICENSE("GPL v2");
33
34/* Control-Values for CPC_Control() Command Subject Selection */
35#define CONTR_CAN_MESSAGE 0x04
36#define CONTR_CAN_STATE 0x0C
37#define CONTR_BUS_ERROR 0x1C
38
39/* Control Command Actions */
40#define CONTR_CONT_OFF 0
41#define CONTR_CONT_ON 1
42#define CONTR_ONCE 2
43
44/* Messages from CPC to PC */
45#define CPC_MSG_TYPE_CAN_FRAME 1 /* CAN data frame */
46#define CPC_MSG_TYPE_RTR_FRAME 8 /* CAN remote frame */
47#define CPC_MSG_TYPE_CAN_PARAMS 12 /* Actual CAN parameters */
48#define CPC_MSG_TYPE_CAN_STATE 14 /* CAN state message */
49#define CPC_MSG_TYPE_EXT_CAN_FRAME 16 /* Extended CAN data frame */
50#define CPC_MSG_TYPE_EXT_RTR_FRAME 17 /* Extended remote frame */
51#define CPC_MSG_TYPE_CONTROL 19 /* change interface behavior */
52#define CPC_MSG_TYPE_CONFIRM 20 /* command processed confirmation */
53#define CPC_MSG_TYPE_OVERRUN 21 /* overrun events */
54#define CPC_MSG_TYPE_CAN_FRAME_ERROR 23 /* detected bus errors */
55#define CPC_MSG_TYPE_ERR_COUNTER 25 /* RX/TX error counter */
56
57/* Messages from the PC to the CPC interface */
58#define CPC_CMD_TYPE_CAN_FRAME 1 /* CAN data frame */
59#define CPC_CMD_TYPE_CONTROL 3 /* control of interface behavior */
60#define CPC_CMD_TYPE_CAN_PARAMS 6 /* set CAN parameters */
61#define CPC_CMD_TYPE_RTR_FRAME 13 /* CAN remote frame */
62#define CPC_CMD_TYPE_CAN_STATE 14 /* CAN state message */
63#define CPC_CMD_TYPE_EXT_CAN_FRAME 15 /* Extended CAN data frame */
64#define CPC_CMD_TYPE_EXT_RTR_FRAME 16 /* Extended CAN remote frame */
65#define CPC_CMD_TYPE_CAN_EXIT 200 /* exit the CAN */
66
67#define CPC_CMD_TYPE_INQ_ERR_COUNTER 25 /* request the CAN error counters */
68#define CPC_CMD_TYPE_CLEAR_MSG_QUEUE 8 /* clear CPC_MSG queue */
69#define CPC_CMD_TYPE_CLEAR_CMD_QUEUE 28 /* clear CPC_CMD queue */
70
71#define CPC_CC_TYPE_SJA1000 2 /* Philips basic CAN controller */
72
73#define CPC_CAN_ECODE_ERRFRAME 0x01 /* Ecode type */
74
75/* Overrun types */
76#define CPC_OVR_EVENT_CAN 0x01
77#define CPC_OVR_EVENT_CANSTATE 0x02
78#define CPC_OVR_EVENT_BUSERROR 0x04
79
80/*
81 * If the CAN controller lost a message we indicate it with the highest bit
82 * set in the count field.
83 */
84#define CPC_OVR_HW 0x80
85
86/* Size of the "struct ems_cpc_msg" without the union */
87#define CPC_MSG_HEADER_LEN 11
88#define CPC_CAN_MSG_MIN_SIZE 5
89
90/* Define these values to match your devices */
91#define USB_CPCUSB_VENDOR_ID 0x12D6
92
93#define USB_CPCUSB_ARM7_PRODUCT_ID 0x0444
94
95/* Mode register NXP LPC2119/SJA1000 CAN Controller */
96#define SJA1000_MOD_NORMAL 0x00
97#define SJA1000_MOD_RM 0x01
98
99/* ECC register NXP LPC2119/SJA1000 CAN Controller */
100#define SJA1000_ECC_SEG 0x1F
101#define SJA1000_ECC_DIR 0x20
102#define SJA1000_ECC_ERR 0x06
103#define SJA1000_ECC_BIT 0x00
104#define SJA1000_ECC_FORM 0x40
105#define SJA1000_ECC_STUFF 0x80
106#define SJA1000_ECC_MASK 0xc0
107
108/* Status register content */
109#define SJA1000_SR_BS 0x80
110#define SJA1000_SR_ES 0x40
111
112#define SJA1000_DEFAULT_OUTPUT_CONTROL 0xDA
113
114/*
115 * The device actually uses a 16MHz clock to generate the CAN clock
116 * but it expects SJA1000 bit settings based on 8MHz (is internally
117 * converted).
118 */
119#define EMS_USB_ARM7_CLOCK 8000000
120
121/*
122 * CAN-Message representation in a CPC_MSG. Message object type is
123 * CPC_MSG_TYPE_CAN_FRAME or CPC_MSG_TYPE_RTR_FRAME or
124 * CPC_MSG_TYPE_EXT_CAN_FRAME or CPC_MSG_TYPE_EXT_RTR_FRAME.
125 */
126struct cpc_can_msg {
127 u32 id;
128 u8 length;
129 u8 msg[8];
130};
131
132/* Representation of the CAN parameters for the SJA1000 controller */
133struct cpc_sja1000_params {
134 u8 mode;
135 u8 acc_code0;
136 u8 acc_code1;
137 u8 acc_code2;
138 u8 acc_code3;
139 u8 acc_mask0;
140 u8 acc_mask1;
141 u8 acc_mask2;
142 u8 acc_mask3;
143 u8 btr0;
144 u8 btr1;
145 u8 outp_contr;
146};
147
148/* CAN params message representation */
149struct cpc_can_params {
150 u8 cc_type;
151
152 /* Will support M16C CAN controller in the future */
153 union {
154 struct cpc_sja1000_params sja1000;
155 } cc_params;
156};
157
158/* Structure for confirmed message handling */
159struct cpc_confirm {
160 u8 error; /* error code */
161};
162
163/* Structure for overrun conditions */
164struct cpc_overrun {
165 u8 event;
166 u8 count;
167};
168
169/* SJA1000 CAN errors (compatible to NXP LPC2119) */
170struct cpc_sja1000_can_error {
171 u8 ecc;
172 u8 rxerr;
173 u8 txerr;
174};
175
176/* structure for CAN error conditions */
177struct cpc_can_error {
178 u8 ecode;
179
180 struct {
181 u8 cc_type;
182
183 /* Other controllers may also provide error code capture regs */
184 union {
185 struct cpc_sja1000_can_error sja1000;
186 } regs;
187 } cc;
188};
189
190/*
191 * Structure containing RX/TX error counter. This structure is used to request
192 * the values of the CAN controllers TX and RX error counter.
193 */
194struct cpc_can_err_counter {
195 u8 rx;
196 u8 tx;
197};
198
199/* Main message type used between library and application */
ba2d3587 200struct __packed ems_cpc_msg {
702171ad
SH		 201 u8 type; /* type of message */
202 u8 length; /* length of data within union 'msg' */
203 u8 msgid; /* confirmation handle */
204 u32 ts_sec; /* timestamp in seconds */
205 u32 ts_nsec; /* timestamp in nano seconds */
206
207 union {
208 u8 generic[64];
209 struct cpc_can_msg can_msg;
210 struct cpc_can_params can_params;
211 struct cpc_confirm confirmation;
212 struct cpc_overrun overrun;
213 struct cpc_can_error error;
214 struct cpc_can_err_counter err_counter;
215 u8 can_state;
216 } msg;
217};
218
219/*
220 * Table of devices that work with this driver
221 * NOTE: This driver supports only CPC-USB/ARM7 (LPC2119) yet.
222 */
223static struct usb_device_id ems_usb_table[] = {
224 {USB_DEVICE(USB_CPCUSB_VENDOR_ID, USB_CPCUSB_ARM7_PRODUCT_ID)},
225 {} /* Terminating entry */
226};
227
228MODULE_DEVICE_TABLE(usb, ems_usb_table);
229
230#define RX_BUFFER_SIZE 64
231#define CPC_HEADER_SIZE 4
232#define INTR_IN_BUFFER_SIZE 4
233
234#define MAX_RX_URBS 10
a6e4bc53 235#define MAX_TX_URBS 10
702171ad
SH		 236
237struct ems_usb;
238
239struct ems_tx_urb_context {
240 struct ems_usb *dev;
241
242 u32 echo_index;
243 u8 dlc;
244};
245
246struct ems_usb {
247 struct can_priv can; /* must be the first member */
702171ad
SH		 248
249 struct sk_buff *echo_skb[MAX_TX_URBS];
250
251 struct usb_device *udev;
252 struct net_device *netdev;
253
254 atomic_t active_tx_urbs;
255 struct usb_anchor tx_submitted;
256 struct ems_tx_urb_context tx_contexts[MAX_TX_URBS];
257
258 struct usb_anchor rx_submitted;
259
260 struct urb *intr_urb;
261
262 u8 *tx_msg_buffer;
263
264 u8 *intr_in_buffer;
265 unsigned int free_slots; /* remember number of available slots */
266
267 struct ems_cpc_msg active_params; /* active controller parameters */
268};
269
270static void ems_usb_read_interrupt_callback(struct urb *urb)
271{
272 struct ems_usb *dev = urb->context;
273 struct net_device *netdev = dev->netdev;
274 int err;
275
276 if (!netif_device_present(netdev))
277 return;
278
279 switch (urb->status) {
280 case 0:
281 dev->free_slots = dev->intr_in_buffer[1];
282 break;
283
284 case -ECONNRESET: /* unlink */
285 case -ENOENT:
286 case -ESHUTDOWN:
287 return;
288
289 default:
aabdfd6a 290 netdev_info(netdev, "Rx interrupt aborted %d\n", urb->status);
702171ad
SH		 291 break;
292 }
293
294 err = usb_submit_urb(urb, GFP_ATOMIC);
295
296 if (err == -ENODEV)
297 netif_device_detach(netdev);
298 else if (err)
aabdfd6a 299 netdev_err(netdev, "failed resubmitting intr urb: %d\n", err);
702171ad
SH		 300}
301
302static void ems_usb_rx_can_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
303{
304 struct can_frame *cf;
305 struct sk_buff *skb;
306 int i;
307 struct net_device_stats *stats = &dev->netdev->stats;
308
7b6856a0 309 skb = alloc_can_skb(dev->netdev, &cf);
702171ad
SH		 310 if (skb == NULL)
311 return;
312
2b2072e9 313 cf->can_id = le32_to_cpu(msg->msg.can_msg.id);
c7cd606f 314 cf->can_dlc = get_can_dlc(msg->msg.can_msg.length & 0xF);
702171ad 315
8e95a202
JP		 316 if (msg->type == CPC_MSG_TYPE_EXT_CAN_FRAME ||
317 msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME)
702171ad
SH		 318 cf->can_id |= CAN_EFF_FLAG;
319
8e95a202
JP		 320 if (msg->type == CPC_MSG_TYPE_RTR_FRAME ||
321 msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME) {
702171ad
SH		 322 cf->can_id |= CAN_RTR_FLAG;
323 } else {
324 for (i = 0; i < cf->can_dlc; i++)
325 cf->data[i] = msg->msg.can_msg.msg[i];
326 }
327
328 netif_rx(skb);
329
330 stats->rx_packets++;
331 stats->rx_bytes += cf->can_dlc;
332}
333
334static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg)
335{
336 struct can_frame *cf;
337 struct sk_buff *skb;
338 struct net_device_stats *stats = &dev->netdev->stats;
339
7b6856a0 340 skb = alloc_can_err_skb(dev->netdev, &cf);
702171ad
SH		 341 if (skb == NULL)
342 return;
343
702171ad
SH		 344 if (msg->type == CPC_MSG_TYPE_CAN_STATE) {
345 u8 state = msg->msg.can_state;
346
347 if (state & SJA1000_SR_BS) {
348 dev->can.state = CAN_STATE_BUS_OFF;
349 cf->can_id |= CAN_ERR_BUSOFF;
350
351 can_bus_off(dev->netdev);
352 } else if (state & SJA1000_SR_ES) {
353 dev->can.state = CAN_STATE_ERROR_WARNING;
354 dev->can.can_stats.error_warning++;
355 } else {
356 dev->can.state = CAN_STATE_ERROR_ACTIVE;
357 dev->can.can_stats.error_passive++;
358 }
359 } else if (msg->type == CPC_MSG_TYPE_CAN_FRAME_ERROR) {
360 u8 ecc = msg->msg.error.cc.regs.sja1000.ecc;
361 u8 txerr = msg->msg.error.cc.regs.sja1000.txerr;
362 u8 rxerr = msg->msg.error.cc.regs.sja1000.rxerr;
363
364 /* bus error interrupt */
365 dev->can.can_stats.bus_error++;
366 stats->rx_errors++;
367
368 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
369
370 switch (ecc & SJA1000_ECC_MASK) {
371 case SJA1000_ECC_BIT:
372 cf->data[2] |= CAN_ERR_PROT_BIT;
373 break;
374 case SJA1000_ECC_FORM:
375 cf->data[2] |= CAN_ERR_PROT_FORM;
376 break;
377 case SJA1000_ECC_STUFF:
378 cf->data[2] |= CAN_ERR_PROT_STUFF;
379 break;
380 default:
381 cf->data[2] |= CAN_ERR_PROT_UNSPEC;
382 cf->data[3] = ecc & SJA1000_ECC_SEG;
383 break;
384 }
385
25985edc 386 /* Error occurred during transmission? */
702171ad
SH		 387 if ((ecc & SJA1000_ECC_DIR) == 0)
388 cf->data[2] |= CAN_ERR_PROT_TX;
389
390 if (dev->can.state == CAN_STATE_ERROR_WARNING ||
391 dev->can.state == CAN_STATE_ERROR_PASSIVE) {
392 cf->data[1] = (txerr > rxerr) ?
393 CAN_ERR_CRTL_TX_PASSIVE : CAN_ERR_CRTL_RX_PASSIVE;
394 }
395 } else if (msg->type == CPC_MSG_TYPE_OVERRUN) {
396 cf->can_id |= CAN_ERR_CRTL;
397 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
398
399 stats->rx_over_errors++;
400 stats->rx_errors++;
401 }
402
403 netif_rx(skb);
404
405 stats->rx_packets++;
406 stats->rx_bytes += cf->can_dlc;
407}
408
409/*
410 * callback for bulk IN urb
411 */
412static void ems_usb_read_bulk_callback(struct urb *urb)
413{
414 struct ems_usb *dev = urb->context;
415 struct net_device *netdev;
416 int retval;
417
418 netdev = dev->netdev;
419
420 if (!netif_device_present(netdev))
421 return;
422
423 switch (urb->status) {
424 case 0: /* success */
425 break;
426
427 case -ENOENT:
428 return;
429
430 default:
aabdfd6a 431 netdev_info(netdev, "Rx URB aborted (%d)\n", urb->status);
702171ad
SH		 432 goto resubmit_urb;
433 }
434
435 if (urb->actual_length > CPC_HEADER_SIZE) {
436 struct ems_cpc_msg *msg;
437 u8 *ibuf = urb->transfer_buffer;
438 u8 msg_count, again, start;
439
440 msg_count = ibuf[0] & ~0x80;
441 again = ibuf[0] & 0x80;
442
443 start = CPC_HEADER_SIZE;
444
445 while (msg_count) {
446 msg = (struct ems_cpc_msg *)&ibuf[start];
447
448 switch (msg->type) {
449 case CPC_MSG_TYPE_CAN_STATE:
450 /* Process CAN state changes */
451 ems_usb_rx_err(dev, msg);
452 break;
453
454 case CPC_MSG_TYPE_CAN_FRAME:
455 case CPC_MSG_TYPE_EXT_CAN_FRAME:
456 case CPC_MSG_TYPE_RTR_FRAME:
457 case CPC_MSG_TYPE_EXT_RTR_FRAME:
458 ems_usb_rx_can_msg(dev, msg);
459 break;
460
461 case CPC_MSG_TYPE_CAN_FRAME_ERROR:
462 /* Process errorframe */
463 ems_usb_rx_err(dev, msg);
464 break;
465
466 case CPC_MSG_TYPE_OVERRUN:
467 /* Message lost while receiving */
468 ems_usb_rx_err(dev, msg);
469 break;
470 }
471
472 start += CPC_MSG_HEADER_LEN + msg->length;
473 msg_count--;
474
475 if (start > urb->transfer_buffer_length) {
aabdfd6a 476 netdev_err(netdev, "format error\n");
702171ad
SH		 477 break;
478 }
479 }
480 }
481
482resubmit_urb:
483 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2),
484 urb->transfer_buffer, RX_BUFFER_SIZE,
485 ems_usb_read_bulk_callback, dev);
486
487 retval = usb_submit_urb(urb, GFP_ATOMIC);
488
489 if (retval == -ENODEV)
490 netif_device_detach(netdev);
491 else if (retval)
aabdfd6a
WG		 492 netdev_err(netdev,
493 "failed resubmitting read bulk urb: %d\n", retval);
702171ad
SH		 494}
495
496/*
497 * callback for bulk IN urb
498 */
499static void ems_usb_write_bulk_callback(struct urb *urb)
500{
501 struct ems_tx_urb_context *context = urb->context;
502 struct ems_usb *dev;
503 struct net_device *netdev;
504
505 BUG_ON(!context);
506
507 dev = context->dev;
508 netdev = dev->netdev;
509
510 /* free up our allocated buffer */
997ea58e
DM		 511 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
512 urb->transfer_buffer, urb->transfer_dma);
702171ad
SH		 513
514 atomic_dec(&dev->active_tx_urbs);
515
516 if (!netif_device_present(netdev))
517 return;
518
519 if (urb->status)
aabdfd6a 520 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
702171ad
SH		 521
522 netdev->trans_start = jiffies;
523
524 /* transmission complete interrupt */
525 netdev->stats.tx_packets++;
526 netdev->stats.tx_bytes += context->dlc;
527
528 can_get_echo_skb(netdev, context->echo_index);
529
530 /* Release context */
531 context->echo_index = MAX_TX_URBS;
532
533 if (netif_queue_stopped(netdev))
534 netif_wake_queue(netdev);
535}
536
537/*
538 * Send the given CPC command synchronously
539 */
540static int ems_usb_command_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
541{
542 int actual_length;
543
544 /* Copy payload */
545 memcpy(&dev->tx_msg_buffer[CPC_HEADER_SIZE], msg,
546 msg->length + CPC_MSG_HEADER_LEN);
547
548 /* Clear header */
549 memset(&dev->tx_msg_buffer[0], 0, CPC_HEADER_SIZE);
550
551 return usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2),
552 &dev->tx_msg_buffer[0],
553 msg->length + CPC_MSG_HEADER_LEN + CPC_HEADER_SIZE,
554 &actual_length, 1000);
555}
556
557/*
558 * Change CAN controllers' mode register
559 */
560static int ems_usb_write_mode(struct ems_usb *dev, u8 mode)
561{
562 dev->active_params.msg.can_params.cc_params.sja1000.mode = mode;
563
564 return ems_usb_command_msg(dev, &dev->active_params);
565}
566
567/*
568 * Send a CPC_Control command to change behaviour when interface receives a CAN
569 * message, bus error or CAN state changed notifications.
570 */
571static int ems_usb_control_cmd(struct ems_usb *dev, u8 val)
572{
573 struct ems_cpc_msg cmd;
574
575 cmd.type = CPC_CMD_TYPE_CONTROL;
576 cmd.length = CPC_MSG_HEADER_LEN + 1;
577
578 cmd.msgid = 0;
579
580 cmd.msg.generic[0] = val;
581
582 return ems_usb_command_msg(dev, &cmd);
583}
584
585/*
586 * Start interface
587 */
588static int ems_usb_start(struct ems_usb *dev)
589{
590 struct net_device *netdev = dev->netdev;
591 int err, i;
592
593 dev->intr_in_buffer[0] = 0;
594 dev->free_slots = 15; /* initial size */
595
596 for (i = 0; i < MAX_RX_URBS; i++) {
597 struct urb *urb = NULL;
598 u8 *buf = NULL;
599
600 /* create a URB, and a buffer for it */
601 urb = usb_alloc_urb(0, GFP_KERNEL);
602 if (!urb) {
aabdfd6a 603 netdev_err(netdev, "No memory left for URBs\n");
2ee6850c
SH		 604 err = -ENOMEM;
605 break;
702171ad
SH		 606 }
607
997ea58e
DM		 608 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
609 &urb->transfer_dma);
702171ad 610 if (!buf) {
aabdfd6a 611 netdev_err(netdev, "No memory left for USB buffer\n");
702171ad 612 usb_free_urb(urb);
2ee6850c
SH		 613 err = -ENOMEM;
614 break;
702171ad
SH		 615 }
616
617 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2),
618 buf, RX_BUFFER_SIZE,
619 ems_usb_read_bulk_callback, dev);
620 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
621 usb_anchor_urb(urb, &dev->rx_submitted);
622
623 err = usb_submit_urb(urb, GFP_KERNEL);
624 if (err) {
702171ad 625 usb_unanchor_urb(urb);
997ea58e
DM		 626 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
627 urb->transfer_dma);
702171ad
SH		 628 break;
629 }
630
631 /* Drop reference, USB core will take care of freeing it */
632 usb_free_urb(urb);
633 }
634
635 /* Did we submit any URBs */
636 if (i == 0) {
aabdfd6a 637 netdev_warn(netdev, "couldn't setup read URBs\n");
702171ad
SH		 638 return err;
639 }
640
641 /* Warn if we've couldn't transmit all the URBs */
642 if (i < MAX_RX_URBS)
aabdfd6a 643 netdev_warn(netdev, "rx performance may be slow\n");
702171ad
SH		 644
645 /* Setup and start interrupt URB */
646 usb_fill_int_urb(dev->intr_urb, dev->udev,
647 usb_rcvintpipe(dev->udev, 1),
648 dev->intr_in_buffer,
649 INTR_IN_BUFFER_SIZE,
650 ems_usb_read_interrupt_callback, dev, 1);
651
652 err = usb_submit_urb(dev->intr_urb, GFP_KERNEL);
653 if (err) {
aabdfd6a 654 netdev_warn(netdev, "intr URB submit failed: %d\n", err);
702171ad
SH		 655
656 return err;
657 }
658
659 /* CPC-USB will transfer received message to host */
660 err = ems_usb_control_cmd(dev, CONTR_CAN_MESSAGE | CONTR_CONT_ON);
661 if (err)
662 goto failed;
663
664 /* CPC-USB will transfer CAN state changes to host */
665 err = ems_usb_control_cmd(dev, CONTR_CAN_STATE | CONTR_CONT_ON);
666 if (err)
667 goto failed;
668
669 /* CPC-USB will transfer bus errors to host */
670 err = ems_usb_control_cmd(dev, CONTR_BUS_ERROR | CONTR_CONT_ON);
671 if (err)
672 goto failed;
673
674 err = ems_usb_write_mode(dev, SJA1000_MOD_NORMAL);
675 if (err)
676 goto failed;
677
678 dev->can.state = CAN_STATE_ERROR_ACTIVE;
679
680 return 0;
681
682failed:
aabdfd6a 683 netdev_warn(netdev, "couldn't submit control: %d\n", err);
702171ad
SH		 684
685 return err;
686}
687
688static void unlink_all_urbs(struct ems_usb *dev)
689{
690 int i;
691
692 usb_unlink_urb(dev->intr_urb);
693
694 usb_kill_anchored_urbs(&dev->rx_submitted);
695
696 usb_kill_anchored_urbs(&dev->tx_submitted);
697 atomic_set(&dev->active_tx_urbs, 0);
698
699 for (i = 0; i < MAX_TX_URBS; i++)
700 dev->tx_contexts[i].echo_index = MAX_TX_URBS;
701}
702
703static int ems_usb_open(struct net_device *netdev)
704{
705 struct ems_usb *dev = netdev_priv(netdev);
706 int err;
707
708 err = ems_usb_write_mode(dev, SJA1000_MOD_RM);
709 if (err)
710 return err;
711
712 /* common open */
713 err = open_candev(netdev);
714 if (err)
715 return err;
716
717 /* finally start device */
718 err = ems_usb_start(dev);
719 if (err) {
720 if (err == -ENODEV)
721 netif_device_detach(dev->netdev);
722
aabdfd6a 723 netdev_warn(netdev, "couldn't start device: %d\n", err);
702171ad
SH		 724
725 close_candev(netdev);
726
727 return err;
728 }
729
702171ad
SH		 730
731 netif_start_queue(netdev);
732
733 return 0;
734}
735
736static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *netdev)
737{
738 struct ems_usb *dev = netdev_priv(netdev);
739 struct ems_tx_urb_context *context = NULL;
740 struct net_device_stats *stats = &netdev->stats;
741 struct can_frame *cf = (struct can_frame *)skb->data;
742 struct ems_cpc_msg *msg;
743 struct urb *urb;
744 u8 *buf;
745 int i, err;
746 size_t size = CPC_HEADER_SIZE + CPC_MSG_HEADER_LEN
747 + sizeof(struct cpc_can_msg);
748
3ccd4c61
OH		 749 if (can_dropped_invalid_skb(netdev, skb))
750 return NETDEV_TX_OK;
751
702171ad
SH		 752 /* create a URB, and a buffer for it, and copy the data to the URB */
753 urb = usb_alloc_urb(0, GFP_ATOMIC);
754 if (!urb) {
aabdfd6a 755 netdev_err(netdev, "No memory left for URBs\n");
702171ad
SH		 756 goto nomem;
757 }
758
997ea58e 759 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, &urb->transfer_dma);
702171ad 760 if (!buf) {
aabdfd6a 761 netdev_err(netdev, "No memory left for USB buffer\n");
702171ad
SH		 762 usb_free_urb(urb);
763 goto nomem;
764 }
765
766 msg = (struct ems_cpc_msg *)&buf[CPC_HEADER_SIZE];
767
768 msg->msg.can_msg.id = cf->can_id & CAN_ERR_MASK;
769 msg->msg.can_msg.length = cf->can_dlc;
770
771 if (cf->can_id & CAN_RTR_FLAG) {
772 msg->type = cf->can_id & CAN_EFF_FLAG ?
773 CPC_CMD_TYPE_EXT_RTR_FRAME : CPC_CMD_TYPE_RTR_FRAME;
774
775 msg->length = CPC_CAN_MSG_MIN_SIZE;
776 } else {
777 msg->type = cf->can_id & CAN_EFF_FLAG ?
778 CPC_CMD_TYPE_EXT_CAN_FRAME : CPC_CMD_TYPE_CAN_FRAME;
779
780 for (i = 0; i < cf->can_dlc; i++)
781 msg->msg.can_msg.msg[i] = cf->data[i];
782
783 msg->length = CPC_CAN_MSG_MIN_SIZE + cf->can_dlc;
784 }
785
2b2072e9
SH		 786 /* Respect byte order */
787 msg->msg.can_msg.id = cpu_to_le32(msg->msg.can_msg.id);
788
702171ad
SH		 789 for (i = 0; i < MAX_TX_URBS; i++) {
790 if (dev->tx_contexts[i].echo_index == MAX_TX_URBS) {
791 context = &dev->tx_contexts[i];
792 break;
793 }
794 }
795
796 /*
797 * May never happen! When this happens we'd more URBs in flight as
798 * allowed (MAX_TX_URBS).
799 */
800 if (!context) {
801 usb_unanchor_urb(urb);
997ea58e 802 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
702171ad 803
aabdfd6a 804 netdev_warn(netdev, "couldn't find free context\n");
702171ad
SH		 805
806 return NETDEV_TX_BUSY;
807 }
808
809 context->dev = dev;
810 context->echo_index = i;
811 context->dlc = cf->can_dlc;
812
813 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
814 size, ems_usb_write_bulk_callback, context);
815 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
816 usb_anchor_urb(urb, &dev->tx_submitted);
817
818 can_put_echo_skb(skb, netdev, context->echo_index);
819
820 atomic_inc(&dev->active_tx_urbs);
821
822 err = usb_submit_urb(urb, GFP_ATOMIC);
823 if (unlikely(err)) {
824 can_free_echo_skb(netdev, context->echo_index);
825
826 usb_unanchor_urb(urb);
997ea58e 827 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
702171ad
SH		 828 dev_kfree_skb(skb);
829
830 atomic_dec(&dev->active_tx_urbs);
831
832 if (err == -ENODEV) {
833 netif_device_detach(netdev);
834 } else {
aabdfd6a 835 netdev_warn(netdev, "failed tx_urb %d\n", err);
702171ad
SH		 836
837 stats->tx_dropped++;
838 }
839 } else {
840 netdev->trans_start = jiffies;
841
842 /* Slow down tx path */
843 if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS ||
844 dev->free_slots < 5) {
845 netif_stop_queue(netdev);
846 }
847 }
848
849 /*
850 * Release our reference to this URB, the USB core will eventually free
851 * it entirely.
852 */
853 usb_free_urb(urb);
854
855 return NETDEV_TX_OK;
856
857nomem:
ea3fb371 858 dev_kfree_skb(skb);
702171ad
SH		 859 stats->tx_dropped++;
860
861 return NETDEV_TX_OK;
862}
863
864static int ems_usb_close(struct net_device *netdev)
865{
866 struct ems_usb *dev = netdev_priv(netdev);
867
868 /* Stop polling */
869 unlink_all_urbs(dev);
870
871 netif_stop_queue(netdev);
872
873 /* Set CAN controller to reset mode */
874 if (ems_usb_write_mode(dev, SJA1000_MOD_RM))
aabdfd6a 875 netdev_warn(netdev, "couldn't stop device");
702171ad
SH		 876
877 close_candev(netdev);
878
702171ad
SH		 879 return 0;
880}
881
882static const struct net_device_ops ems_usb_netdev_ops = {
883 .ndo_open = ems_usb_open,
884 .ndo_stop = ems_usb_close,
885 .ndo_start_xmit = ems_usb_start_xmit,
886};
887
194b9a4c 888static const struct can_bittiming_const ems_usb_bittiming_const = {
702171ad
SH		 889 .name = "ems_usb",
890 .tseg1_min = 1,
891 .tseg1_max = 16,
892 .tseg2_min = 1,
893 .tseg2_max = 8,
894 .sjw_max = 4,
895 .brp_min = 1,
896 .brp_max = 64,
897 .brp_inc = 1,
898};
899
900static int ems_usb_set_mode(struct net_device *netdev, enum can_mode mode)
901{
902 struct ems_usb *dev = netdev_priv(netdev);
903
702171ad
SH		 904 switch (mode) {
905 case CAN_MODE_START:
906 if (ems_usb_write_mode(dev, SJA1000_MOD_NORMAL))
aabdfd6a 907 netdev_warn(netdev, "couldn't start device");
702171ad
SH		 908
909 if (netif_queue_stopped(netdev))
910 netif_wake_queue(netdev);
911 break;
912
913 default:
914 return -EOPNOTSUPP;
915 }
916
917 return 0;
918}
919
920static int ems_usb_set_bittiming(struct net_device *netdev)
921{
922 struct ems_usb *dev = netdev_priv(netdev);
923 struct can_bittiming *bt = &dev->can.bittiming;
924 u8 btr0, btr1;
925
926 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
927 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
928 (((bt->phase_seg2 - 1) & 0x7) << 4);
929 if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
930 btr1 |= 0x80;
931
aabdfd6a 932 netdev_info(netdev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
702171ad
SH		 933
934 dev->active_params.msg.can_params.cc_params.sja1000.btr0 = btr0;
935 dev->active_params.msg.can_params.cc_params.sja1000.btr1 = btr1;
936
937 return ems_usb_command_msg(dev, &dev->active_params);
938}
939
940static void init_params_sja1000(struct ems_cpc_msg *msg)
941{
942 struct cpc_sja1000_params *sja1000 =
943 &msg->msg.can_params.cc_params.sja1000;
944
945 msg->type = CPC_CMD_TYPE_CAN_PARAMS;
946 msg->length = sizeof(struct cpc_can_params);
947 msg->msgid = 0;
948
949 msg->msg.can_params.cc_type = CPC_CC_TYPE_SJA1000;
950
951 /* Acceptance filter open */
952 sja1000->acc_code0 = 0x00;
953 sja1000->acc_code1 = 0x00;
954 sja1000->acc_code2 = 0x00;
955 sja1000->acc_code3 = 0x00;
956
957 /* Acceptance filter open */
958 sja1000->acc_mask0 = 0xFF;
959 sja1000->acc_mask1 = 0xFF;
960 sja1000->acc_mask2 = 0xFF;
961 sja1000->acc_mask3 = 0xFF;
962
963 sja1000->btr0 = 0;
964 sja1000->btr1 = 0;
965
966 sja1000->outp_contr = SJA1000_DEFAULT_OUTPUT_CONTROL;
967 sja1000->mode = SJA1000_MOD_RM;
968}
969
970/*
971 * probe function for new CPC-USB devices
972 */
973static int ems_usb_probe(struct usb_interface *intf,
974 const struct usb_device_id *id)
975{
976 struct net_device *netdev;
977 struct ems_usb *dev;
978 int i, err = -ENOMEM;
979
a6e4bc53 980 netdev = alloc_candev(sizeof(struct ems_usb), MAX_TX_URBS);
702171ad 981 if (!netdev) {
1c0b28b1 982 dev_err(&intf->dev, "ems_usb: Couldn't alloc candev\n");
702171ad
SH		 983 return -ENOMEM;
984 }
985
986 dev = netdev_priv(netdev);
987
988 dev->udev = interface_to_usbdev(intf);
989 dev->netdev = netdev;
990
991 dev->can.state = CAN_STATE_STOPPED;
992 dev->can.clock.freq = EMS_USB_ARM7_CLOCK;
993 dev->can.bittiming_const = &ems_usb_bittiming_const;
994 dev->can.do_set_bittiming = ems_usb_set_bittiming;
995 dev->can.do_set_mode = ems_usb_set_mode;
ad72c347 996 dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
702171ad 997
702171ad
SH		 998 netdev->netdev_ops = &ems_usb_netdev_ops;
999
1000 netdev->flags |= IFF_ECHO; /* we support local echo */
1001
1002 init_usb_anchor(&dev->rx_submitted);
1003
1004 init_usb_anchor(&dev->tx_submitted);
1005 atomic_set(&dev->active_tx_urbs, 0);
1006
1007 for (i = 0; i < MAX_TX_URBS; i++)
1008 dev->tx_contexts[i].echo_index = MAX_TX_URBS;
1009
1010 dev->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
1011 if (!dev->intr_urb) {
1c0b28b1 1012 dev_err(&intf->dev, "Couldn't alloc intr URB\n");
702171ad
SH		 1013 goto cleanup_candev;
1014 }
1015
1016 dev->intr_in_buffer = kzalloc(INTR_IN_BUFFER_SIZE, GFP_KERNEL);
1017 if (!dev->intr_in_buffer) {
1c0b28b1 1018 dev_err(&intf->dev, "Couldn't alloc Intr buffer\n");
702171ad
SH		 1019 goto cleanup_intr_urb;
1020 }
1021
1022 dev->tx_msg_buffer = kzalloc(CPC_HEADER_SIZE +
1023 sizeof(struct ems_cpc_msg), GFP_KERNEL);
1024 if (!dev->tx_msg_buffer) {
1c0b28b1 1025 dev_err(&intf->dev, "Couldn't alloc Tx buffer\n");
702171ad
SH		 1026 goto cleanup_intr_in_buffer;
1027 }
1028
1029 usb_set_intfdata(intf, dev);
1030
1031 SET_NETDEV_DEV(netdev, &intf->dev);
1032
1033 init_params_sja1000(&dev->active_params);
1034
1035 err = ems_usb_command_msg(dev, &dev->active_params);
1036 if (err) {
aabdfd6a 1037 netdev_err(netdev, "couldn't initialize controller: %d\n", err);
702171ad
SH		 1038 goto cleanup_tx_msg_buffer;
1039 }
1040
1041 err = register_candev(netdev);
1042 if (err) {
aabdfd6a 1043 netdev_err(netdev, "couldn't register CAN device: %d\n", err);
702171ad
SH		 1044 goto cleanup_tx_msg_buffer;
1045 }
1046
1047 return 0;
1048
1049cleanup_tx_msg_buffer:
1050 kfree(dev->tx_msg_buffer);
1051
1052cleanup_intr_in_buffer:
1053 kfree(dev->intr_in_buffer);
1054
1055cleanup_intr_urb:
1056 usb_free_urb(dev->intr_urb);
1057
1058cleanup_candev:
1059 free_candev(netdev);
1060
1061 return err;
1062}
1063
1064/*
1065 * called by the usb core when the device is removed from the system
1066 */
1067static void ems_usb_disconnect(struct usb_interface *intf)
1068{
1069 struct ems_usb *dev = usb_get_intfdata(intf);
1070
1071 usb_set_intfdata(intf, NULL);
1072
1073 if (dev) {
1074 unregister_netdev(dev->netdev);
1075 free_candev(dev->netdev);
1076
1077 unlink_all_urbs(dev);
1078
1079 usb_free_urb(dev->intr_urb);
1080
1081 kfree(dev->intr_in_buffer);
1082 }
1083}
1084
1085/* usb specific object needed to register this driver with the usb subsystem */
1086static struct usb_driver ems_usb_driver = {
1087 .name = "ems_usb",
1088 .probe = ems_usb_probe,
1089 .disconnect = ems_usb_disconnect,
1090 .id_table = ems_usb_table,
1091};
1092
d632eb1b 1093module_usb_driver(ems_usb_driver);
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