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Merge back PM core material for v4.16.
[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 */
702171ad
SH		 19#include <linux/signal.h>
20#include <linux/slab.h>
21#include <linux/module.h>
22#include <linux/netdevice.h>
23#include <linux/usb.h>
24
25#include <linux/can.h>
26#include <linux/can/dev.h>
27#include <linux/can/error.h>
28
29MODULE_AUTHOR("Sebastian Haas <haas@ems-wuensche.com>");
30MODULE_DESCRIPTION("CAN driver for EMS Dr. Thomas Wuensche CAN/USB interfaces");
31MODULE_LICENSE("GPL v2");
32
33/* Control-Values for CPC_Control() Command Subject Selection */
34#define CONTR_CAN_MESSAGE 0x04
35#define CONTR_CAN_STATE 0x0C
36#define CONTR_BUS_ERROR 0x1C
37
38/* Control Command Actions */
39#define CONTR_CONT_OFF 0
40#define CONTR_CONT_ON 1
41#define CONTR_ONCE 2
42
43/* Messages from CPC to PC */
44#define CPC_MSG_TYPE_CAN_FRAME 1 /* CAN data frame */
45#define CPC_MSG_TYPE_RTR_FRAME 8 /* CAN remote frame */
46#define CPC_MSG_TYPE_CAN_PARAMS 12 /* Actual CAN parameters */
47#define CPC_MSG_TYPE_CAN_STATE 14 /* CAN state message */
48#define CPC_MSG_TYPE_EXT_CAN_FRAME 16 /* Extended CAN data frame */
49#define CPC_MSG_TYPE_EXT_RTR_FRAME 17 /* Extended remote frame */
50#define CPC_MSG_TYPE_CONTROL 19 /* change interface behavior */
51#define CPC_MSG_TYPE_CONFIRM 20 /* command processed confirmation */
52#define CPC_MSG_TYPE_OVERRUN 21 /* overrun events */
53#define CPC_MSG_TYPE_CAN_FRAME_ERROR 23 /* detected bus errors */
54#define CPC_MSG_TYPE_ERR_COUNTER 25 /* RX/TX error counter */
55
56/* Messages from the PC to the CPC interface */
57#define CPC_CMD_TYPE_CAN_FRAME 1 /* CAN data frame */
58#define CPC_CMD_TYPE_CONTROL 3 /* control of interface behavior */
59#define CPC_CMD_TYPE_CAN_PARAMS 6 /* set CAN parameters */
60#define CPC_CMD_TYPE_RTR_FRAME 13 /* CAN remote frame */
61#define CPC_CMD_TYPE_CAN_STATE 14 /* CAN state message */
62#define CPC_CMD_TYPE_EXT_CAN_FRAME 15 /* Extended CAN data frame */
63#define CPC_CMD_TYPE_EXT_RTR_FRAME 16 /* Extended CAN remote frame */
64#define CPC_CMD_TYPE_CAN_EXIT 200 /* exit the CAN */
65
66#define CPC_CMD_TYPE_INQ_ERR_COUNTER 25 /* request the CAN error counters */
67#define CPC_CMD_TYPE_CLEAR_MSG_QUEUE 8 /* clear CPC_MSG queue */
68#define CPC_CMD_TYPE_CLEAR_CMD_QUEUE 28 /* clear CPC_CMD queue */
69
70#define CPC_CC_TYPE_SJA1000 2 /* Philips basic CAN controller */
71
72#define CPC_CAN_ECODE_ERRFRAME 0x01 /* Ecode type */
73
74/* Overrun types */
75#define CPC_OVR_EVENT_CAN 0x01
76#define CPC_OVR_EVENT_CANSTATE 0x02
77#define CPC_OVR_EVENT_BUSERROR 0x04
78
79/*
80 * If the CAN controller lost a message we indicate it with the highest bit
81 * set in the count field.
82 */
83#define CPC_OVR_HW 0x80
84
85/* Size of the "struct ems_cpc_msg" without the union */
86#define CPC_MSG_HEADER_LEN 11
87#define CPC_CAN_MSG_MIN_SIZE 5
88
89/* Define these values to match your devices */
90#define USB_CPCUSB_VENDOR_ID 0x12D6
91
92#define USB_CPCUSB_ARM7_PRODUCT_ID 0x0444
93
94/* Mode register NXP LPC2119/SJA1000 CAN Controller */
95#define SJA1000_MOD_NORMAL 0x00
96#define SJA1000_MOD_RM 0x01
97
98/* ECC register NXP LPC2119/SJA1000 CAN Controller */
99#define SJA1000_ECC_SEG 0x1F
100#define SJA1000_ECC_DIR 0x20
101#define SJA1000_ECC_ERR 0x06
102#define SJA1000_ECC_BIT 0x00
103#define SJA1000_ECC_FORM 0x40
104#define SJA1000_ECC_STUFF 0x80
105#define SJA1000_ECC_MASK 0xc0
106
107/* Status register content */
108#define SJA1000_SR_BS 0x80
109#define SJA1000_SR_ES 0x40
110
111#define SJA1000_DEFAULT_OUTPUT_CONTROL 0xDA
112
113/*
114 * The device actually uses a 16MHz clock to generate the CAN clock
115 * but it expects SJA1000 bit settings based on 8MHz (is internally
116 * converted).
117 */
118#define EMS_USB_ARM7_CLOCK 8000000
119
90cfde46
GU		 120#define CPC_TX_QUEUE_TRIGGER_LOW 25
121#define CPC_TX_QUEUE_TRIGGER_HIGH 35
122
702171ad
SH		 123/*
124 * CAN-Message representation in a CPC_MSG. Message object type is
125 * CPC_MSG_TYPE_CAN_FRAME or CPC_MSG_TYPE_RTR_FRAME or
126 * CPC_MSG_TYPE_EXT_CAN_FRAME or CPC_MSG_TYPE_EXT_RTR_FRAME.
127 */
128struct cpc_can_msg {
8a4b5b0f 129 __le32 id;
702171ad
SH		 130 u8 length;
131 u8 msg[8];
132};
133
134/* Representation of the CAN parameters for the SJA1000 controller */
135struct cpc_sja1000_params {
136 u8 mode;
137 u8 acc_code0;
138 u8 acc_code1;
139 u8 acc_code2;
140 u8 acc_code3;
141 u8 acc_mask0;
142 u8 acc_mask1;
143 u8 acc_mask2;
144 u8 acc_mask3;
145 u8 btr0;
146 u8 btr1;
147 u8 outp_contr;
148};
149
150/* CAN params message representation */
151struct cpc_can_params {
152 u8 cc_type;
153
154 /* Will support M16C CAN controller in the future */
155 union {
156 struct cpc_sja1000_params sja1000;
157 } cc_params;
158};
159
160/* Structure for confirmed message handling */
161struct cpc_confirm {
162 u8 error; /* error code */
163};
164
165/* Structure for overrun conditions */
166struct cpc_overrun {
167 u8 event;
168 u8 count;
169};
170
171/* SJA1000 CAN errors (compatible to NXP LPC2119) */
172struct cpc_sja1000_can_error {
173 u8 ecc;
174 u8 rxerr;
175 u8 txerr;
176};
177
178/* structure for CAN error conditions */
179struct cpc_can_error {
180 u8 ecode;
181
182 struct {
183 u8 cc_type;
184
185 /* Other controllers may also provide error code capture regs */
186 union {
187 struct cpc_sja1000_can_error sja1000;
188 } regs;
189 } cc;
190};
191
192/*
193 * Structure containing RX/TX error counter. This structure is used to request
194 * the values of the CAN controllers TX and RX error counter.
195 */
196struct cpc_can_err_counter {
197 u8 rx;
198 u8 tx;
199};
200
201/* Main message type used between library and application */
ba2d3587 202struct __packed ems_cpc_msg {
702171ad
SH		 203 u8 type; /* type of message */
204 u8 length; /* length of data within union 'msg' */
205 u8 msgid; /* confirmation handle */
a0bc163a
MKB		 206 __le32 ts_sec; /* timestamp in seconds */
207 __le32 ts_nsec; /* timestamp in nano seconds */
702171ad
SH		 208
209 union {
210 u8 generic[64];
211 struct cpc_can_msg can_msg;
212 struct cpc_can_params can_params;
213 struct cpc_confirm confirmation;
214 struct cpc_overrun overrun;
215 struct cpc_can_error error;
216 struct cpc_can_err_counter err_counter;
217 u8 can_state;
218 } msg;
219};
220
221/*
222 * Table of devices that work with this driver
223 * NOTE: This driver supports only CPC-USB/ARM7 (LPC2119) yet.
224 */
225static struct usb_device_id ems_usb_table[] = {
226 {USB_DEVICE(USB_CPCUSB_VENDOR_ID, USB_CPCUSB_ARM7_PRODUCT_ID)},
227 {} /* Terminating entry */
228};
229
230MODULE_DEVICE_TABLE(usb, ems_usb_table);
231
232#define RX_BUFFER_SIZE 64
233#define CPC_HEADER_SIZE 4
234#define INTR_IN_BUFFER_SIZE 4
235
236#define MAX_RX_URBS 10
a6e4bc53 237#define MAX_TX_URBS 10
702171ad
SH		 238
239struct ems_usb;
240
241struct ems_tx_urb_context {
242 struct ems_usb *dev;
243
244 u32 echo_index;
245 u8 dlc;
246};
247
248struct ems_usb {
249 struct can_priv can; /* must be the first member */
702171ad
SH		 250
251 struct sk_buff *echo_skb[MAX_TX_URBS];
252
253 struct usb_device *udev;
254 struct net_device *netdev;
255
256 atomic_t active_tx_urbs;
257 struct usb_anchor tx_submitted;
258 struct ems_tx_urb_context tx_contexts[MAX_TX_URBS];
259
260 struct usb_anchor rx_submitted;
261
262 struct urb *intr_urb;
263
264 u8 *tx_msg_buffer;
265
266 u8 *intr_in_buffer;
267 unsigned int free_slots; /* remember number of available slots */
268
269 struct ems_cpc_msg active_params; /* active controller parameters */
270};
271
272static void ems_usb_read_interrupt_callback(struct urb *urb)
273{
274 struct ems_usb *dev = urb->context;
275 struct net_device *netdev = dev->netdev;
276 int err;
277
278 if (!netif_device_present(netdev))
279 return;
280
281 switch (urb->status) {
282 case 0:
283 dev->free_slots = dev->intr_in_buffer[1];
59097ac9
MKB		 284 if (dev->free_slots > CPC_TX_QUEUE_TRIGGER_HIGH &&
285 netif_queue_stopped(netdev))
286 netif_wake_queue(netdev);
702171ad
SH		 287 break;
288
289 case -ECONNRESET: /* unlink */
290 case -ENOENT:
bd352e1a
MK		 291 case -EPIPE:
292 case -EPROTO:
702171ad
SH		 293 case -ESHUTDOWN:
294 return;
295
296 default:
aabdfd6a 297 netdev_info(netdev, "Rx interrupt aborted %d\n", urb->status);
702171ad
SH		 298 break;
299 }
300
301 err = usb_submit_urb(urb, GFP_ATOMIC);
302
303 if (err == -ENODEV)
304 netif_device_detach(netdev);
305 else if (err)
aabdfd6a 306 netdev_err(netdev, "failed resubmitting intr urb: %d\n", err);
702171ad
SH		 307}
308
309static void ems_usb_rx_can_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
310{
311 struct can_frame *cf;
312 struct sk_buff *skb;
313 int i;
314 struct net_device_stats *stats = &dev->netdev->stats;
315
7b6856a0 316 skb = alloc_can_skb(dev->netdev, &cf);
702171ad
SH		 317 if (skb == NULL)
318 return;
319
2b2072e9 320 cf->can_id = le32_to_cpu(msg->msg.can_msg.id);
c7cd606f 321 cf->can_dlc = get_can_dlc(msg->msg.can_msg.length & 0xF);
702171ad 322
8e95a202
JP		 323 if (msg->type == CPC_MSG_TYPE_EXT_CAN_FRAME ||
324 msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME)
702171ad
SH		 325 cf->can_id |= CAN_EFF_FLAG;
326
8e95a202
JP		 327 if (msg->type == CPC_MSG_TYPE_RTR_FRAME ||
328 msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME) {
702171ad
SH		 329 cf->can_id |= CAN_RTR_FLAG;
330 } else {
331 for (i = 0; i < cf->can_dlc; i++)
332 cf->data[i] = msg->msg.can_msg.msg[i];
333 }
334
702171ad
SH		 335 stats->rx_packets++;
336 stats->rx_bytes += cf->can_dlc;
43c021e8 337 netif_rx(skb);
702171ad
SH		 338}
339
340static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg)
341{
342 struct can_frame *cf;
343 struct sk_buff *skb;
344 struct net_device_stats *stats = &dev->netdev->stats;
345
7b6856a0 346 skb = alloc_can_err_skb(dev->netdev, &cf);
702171ad
SH		 347 if (skb == NULL)
348 return;
349
702171ad
SH		 350 if (msg->type == CPC_MSG_TYPE_CAN_STATE) {
351 u8 state = msg->msg.can_state;
352
353 if (state & SJA1000_SR_BS) {
354 dev->can.state = CAN_STATE_BUS_OFF;
355 cf->can_id |= CAN_ERR_BUSOFF;
356
be38a6f9 357 dev->can.can_stats.bus_off++;
702171ad
SH		 358 can_bus_off(dev->netdev);
359 } else if (state & SJA1000_SR_ES) {
360 dev->can.state = CAN_STATE_ERROR_WARNING;
361 dev->can.can_stats.error_warning++;
362 } else {
363 dev->can.state = CAN_STATE_ERROR_ACTIVE;
364 dev->can.can_stats.error_passive++;
365 }
366 } else if (msg->type == CPC_MSG_TYPE_CAN_FRAME_ERROR) {
367 u8 ecc = msg->msg.error.cc.regs.sja1000.ecc;
368 u8 txerr = msg->msg.error.cc.regs.sja1000.txerr;
369 u8 rxerr = msg->msg.error.cc.regs.sja1000.rxerr;
370
371 /* bus error interrupt */
372 dev->can.can_stats.bus_error++;
373 stats->rx_errors++;
374
375 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
376
377 switch (ecc & SJA1000_ECC_MASK) {
378 case SJA1000_ECC_BIT:
379 cf->data[2] |= CAN_ERR_PROT_BIT;
380 break;
381 case SJA1000_ECC_FORM:
382 cf->data[2] |= CAN_ERR_PROT_FORM;
383 break;
384 case SJA1000_ECC_STUFF:
385 cf->data[2] |= CAN_ERR_PROT_STUFF;
386 break;
387 default:
702171ad
SH		 388 cf->data[3] = ecc & SJA1000_ECC_SEG;
389 break;
390 }
391
25985edc 392 /* Error occurred during transmission? */
702171ad
SH		 393 if ((ecc & SJA1000_ECC_DIR) == 0)
394 cf->data[2] |= CAN_ERR_PROT_TX;
395
396 if (dev->can.state == CAN_STATE_ERROR_WARNING ||
397 dev->can.state == CAN_STATE_ERROR_PASSIVE) {
398 cf->data[1] = (txerr > rxerr) ?
399 CAN_ERR_CRTL_TX_PASSIVE : CAN_ERR_CRTL_RX_PASSIVE;
400 }
401 } else if (msg->type == CPC_MSG_TYPE_OVERRUN) {
402 cf->can_id |= CAN_ERR_CRTL;
403 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
404
405 stats->rx_over_errors++;
406 stats->rx_errors++;
407 }
408
702171ad
SH		 409 stats->rx_packets++;
410 stats->rx_bytes += cf->can_dlc;
43c021e8 411 netif_rx(skb);
702171ad
SH		 412}
413
414/*
415 * callback for bulk IN urb
416 */
417static void ems_usb_read_bulk_callback(struct urb *urb)
418{
419 struct ems_usb *dev = urb->context;
420 struct net_device *netdev;
421 int retval;
422
423 netdev = dev->netdev;
424
425 if (!netif_device_present(netdev))
426 return;
427
428 switch (urb->status) {
429 case 0: /* success */
430 break;
431
432 case -ENOENT:
433 return;
434
435 default:
aabdfd6a 436 netdev_info(netdev, "Rx URB aborted (%d)\n", urb->status);
702171ad
SH		 437 goto resubmit_urb;
438 }
439
440 if (urb->actual_length > CPC_HEADER_SIZE) {
441 struct ems_cpc_msg *msg;
442 u8 *ibuf = urb->transfer_buffer;
4e2061b1 443 u8 msg_count, start;
702171ad
SH		 444
445 msg_count = ibuf[0] & ~0x80;
702171ad
SH		 446
447 start = CPC_HEADER_SIZE;
448
449 while (msg_count) {
450 msg = (struct ems_cpc_msg *)&ibuf[start];
451
452 switch (msg->type) {
453 case CPC_MSG_TYPE_CAN_STATE:
454 /* Process CAN state changes */
455 ems_usb_rx_err(dev, msg);
456 break;
457
458 case CPC_MSG_TYPE_CAN_FRAME:
459 case CPC_MSG_TYPE_EXT_CAN_FRAME:
460 case CPC_MSG_TYPE_RTR_FRAME:
461 case CPC_MSG_TYPE_EXT_RTR_FRAME:
462 ems_usb_rx_can_msg(dev, msg);
463 break;
464
465 case CPC_MSG_TYPE_CAN_FRAME_ERROR:
466 /* Process errorframe */
467 ems_usb_rx_err(dev, msg);
468 break;
469
470 case CPC_MSG_TYPE_OVERRUN:
471 /* Message lost while receiving */
472 ems_usb_rx_err(dev, msg);
473 break;
474 }
475
476 start += CPC_MSG_HEADER_LEN + msg->length;
477 msg_count--;
478
479 if (start > urb->transfer_buffer_length) {
aabdfd6a 480 netdev_err(netdev, "format error\n");
702171ad
SH		 481 break;
482 }
483 }
484 }
485
486resubmit_urb:
487 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2),
488 urb->transfer_buffer, RX_BUFFER_SIZE,
489 ems_usb_read_bulk_callback, dev);
490
491 retval = usb_submit_urb(urb, GFP_ATOMIC);
492
493 if (retval == -ENODEV)
494 netif_device_detach(netdev);
495 else if (retval)
aabdfd6a
WG		 496 netdev_err(netdev,
497 "failed resubmitting read bulk urb: %d\n", retval);
702171ad
SH		 498}
499
500/*
501 * callback for bulk IN urb
502 */
503static void ems_usb_write_bulk_callback(struct urb *urb)
504{
505 struct ems_tx_urb_context *context = urb->context;
506 struct ems_usb *dev;
507 struct net_device *netdev;
508
509 BUG_ON(!context);
510
511 dev = context->dev;
512 netdev = dev->netdev;
513
514 /* free up our allocated buffer */
997ea58e
DM		 515 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
516 urb->transfer_buffer, urb->transfer_dma);
702171ad
SH		 517
518 atomic_dec(&dev->active_tx_urbs);
519
520 if (!netif_device_present(netdev))
521 return;
522
523 if (urb->status)
aabdfd6a 524 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
702171ad 525
860e9538 526 netif_trans_update(netdev);
702171ad
SH		 527
528 /* transmission complete interrupt */
529 netdev->stats.tx_packets++;
530 netdev->stats.tx_bytes += context->dlc;
531
532 can_get_echo_skb(netdev, context->echo_index);
533
534 /* Release context */
535 context->echo_index = MAX_TX_URBS;
536
702171ad
SH		 537}
538
539/*
540 * Send the given CPC command synchronously
541 */
542static int ems_usb_command_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
543{
544 int actual_length;
545
546 /* Copy payload */
547 memcpy(&dev->tx_msg_buffer[CPC_HEADER_SIZE], msg,
548 msg->length + CPC_MSG_HEADER_LEN);
549
550 /* Clear header */
551 memset(&dev->tx_msg_buffer[0], 0, CPC_HEADER_SIZE);
552
553 return usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2),
554 &dev->tx_msg_buffer[0],
555 msg->length + CPC_MSG_HEADER_LEN + CPC_HEADER_SIZE,
556 &actual_length, 1000);
557}
558
559/*
560 * Change CAN controllers' mode register
561 */
562static int ems_usb_write_mode(struct ems_usb *dev, u8 mode)
563{
564 dev->active_params.msg.can_params.cc_params.sja1000.mode = mode;
565
566 return ems_usb_command_msg(dev, &dev->active_params);
567}
568
569/*
570 * Send a CPC_Control command to change behaviour when interface receives a CAN
571 * message, bus error or CAN state changed notifications.
572 */
573static int ems_usb_control_cmd(struct ems_usb *dev, u8 val)
574{
575 struct ems_cpc_msg cmd;
576
577 cmd.type = CPC_CMD_TYPE_CONTROL;
578 cmd.length = CPC_MSG_HEADER_LEN + 1;
579
580 cmd.msgid = 0;
581
582 cmd.msg.generic[0] = val;
583
584 return ems_usb_command_msg(dev, &cmd);
585}
586
587/*
588 * Start interface
589 */
590static int ems_usb_start(struct ems_usb *dev)
591{
592 struct net_device *netdev = dev->netdev;
593 int err, i;
594
595 dev->intr_in_buffer[0] = 0;
90cfde46 596 dev->free_slots = 50; /* initial size */
702171ad
SH		 597
598 for (i = 0; i < MAX_RX_URBS; i++) {
599 struct urb *urb = NULL;
600 u8 *buf = NULL;
601
602 /* create a URB, and a buffer for it */
603 urb = usb_alloc_urb(0, GFP_KERNEL);
604 if (!urb) {
2ee6850c
SH		 605 err = -ENOMEM;
606 break;
702171ad
SH		 607 }
608
997ea58e
DM		 609 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
610 &urb->transfer_dma);
702171ad 611 if (!buf) {
aabdfd6a 612 netdev_err(netdev, "No memory left for USB buffer\n");
702171ad 613 usb_free_urb(urb);
2ee6850c
SH		 614 err = -ENOMEM;
615 break;
702171ad
SH		 616 }
617
618 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2),
619 buf, RX_BUFFER_SIZE,
620 ems_usb_read_bulk_callback, dev);
621 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
622 usb_anchor_urb(urb, &dev->rx_submitted);
623
624 err = usb_submit_urb(urb, GFP_KERNEL);
625 if (err) {
702171ad 626 usb_unanchor_urb(urb);
997ea58e
DM		 627 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
628 urb->transfer_dma);
a1c31f1d 629 usb_free_urb(urb);
702171ad
SH		 630 break;
631 }
632
633 /* Drop reference, USB core will take care of freeing it */
634 usb_free_urb(urb);
635 }
636
637 /* Did we submit any URBs */
638 if (i == 0) {
aabdfd6a 639 netdev_warn(netdev, "couldn't setup read URBs\n");
702171ad
SH		 640 return err;
641 }
642
643 /* Warn if we've couldn't transmit all the URBs */
644 if (i < MAX_RX_URBS)
aabdfd6a 645 netdev_warn(netdev, "rx performance may be slow\n");
702171ad
SH		 646
647 /* Setup and start interrupt URB */
648 usb_fill_int_urb(dev->intr_urb, dev->udev,
649 usb_rcvintpipe(dev->udev, 1),
650 dev->intr_in_buffer,
651 INTR_IN_BUFFER_SIZE,
652 ems_usb_read_interrupt_callback, dev, 1);
653
654 err = usb_submit_urb(dev->intr_urb, GFP_KERNEL);
655 if (err) {
aabdfd6a 656 netdev_warn(netdev, "intr URB submit failed: %d\n", err);
702171ad
SH		 657
658 return err;
659 }
660
661 /* CPC-USB will transfer received message to host */
662 err = ems_usb_control_cmd(dev, CONTR_CAN_MESSAGE | CONTR_CONT_ON);
663 if (err)
664 goto failed;
665
666 /* CPC-USB will transfer CAN state changes to host */
667 err = ems_usb_control_cmd(dev, CONTR_CAN_STATE | CONTR_CONT_ON);
668 if (err)
669 goto failed;
670
671 /* CPC-USB will transfer bus errors to host */
672 err = ems_usb_control_cmd(dev, CONTR_BUS_ERROR | CONTR_CONT_ON);
673 if (err)
674 goto failed;
675
676 err = ems_usb_write_mode(dev, SJA1000_MOD_NORMAL);
677 if (err)
678 goto failed;
679
680 dev->can.state = CAN_STATE_ERROR_ACTIVE;
681
682 return 0;
683
684failed:
aabdfd6a 685 netdev_warn(netdev, "couldn't submit control: %d\n", err);
702171ad
SH		 686
687 return err;
688}
689
690static void unlink_all_urbs(struct ems_usb *dev)
691{
692 int i;
693
694 usb_unlink_urb(dev->intr_urb);
695
696 usb_kill_anchored_urbs(&dev->rx_submitted);
697
698 usb_kill_anchored_urbs(&dev->tx_submitted);
699 atomic_set(&dev->active_tx_urbs, 0);
700
701 for (i = 0; i < MAX_TX_URBS; i++)
702 dev->tx_contexts[i].echo_index = MAX_TX_URBS;
703}
704
705static int ems_usb_open(struct net_device *netdev)
706{
707 struct ems_usb *dev = netdev_priv(netdev);
708 int err;
709
710 err = ems_usb_write_mode(dev, SJA1000_MOD_RM);
711 if (err)
712 return err;
713
714 /* common open */
715 err = open_candev(netdev);
716 if (err)
717 return err;
718
719 /* finally start device */
720 err = ems_usb_start(dev);
721 if (err) {
722 if (err == -ENODEV)
723 netif_device_detach(dev->netdev);
724
aabdfd6a 725 netdev_warn(netdev, "couldn't start device: %d\n", err);
702171ad
SH		 726
727 close_candev(netdev);
728
729 return err;
730 }
731
702171ad
SH		 732
733 netif_start_queue(netdev);
734
735 return 0;
736}
737
738static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *netdev)
739{
740 struct ems_usb *dev = netdev_priv(netdev);
741 struct ems_tx_urb_context *context = NULL;
742 struct net_device_stats *stats = &netdev->stats;
743 struct can_frame *cf = (struct can_frame *)skb->data;
744 struct ems_cpc_msg *msg;
745 struct urb *urb;
746 u8 *buf;
747 int i, err;
748 size_t size = CPC_HEADER_SIZE + CPC_MSG_HEADER_LEN
749 + sizeof(struct cpc_can_msg);
750
3ccd4c61
OH		 751 if (can_dropped_invalid_skb(netdev, skb))
752 return NETDEV_TX_OK;
753
702171ad
SH		 754 /* create a URB, and a buffer for it, and copy the data to the URB */
755 urb = usb_alloc_urb(0, GFP_ATOMIC);
87ced2f9 756 if (!urb)
702171ad 757 goto nomem;
702171ad 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
8a4b5b0f 768 msg->msg.can_msg.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
702171ad
SH		 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
786 for (i = 0; i < MAX_TX_URBS; i++) {
787 if (dev->tx_contexts[i].echo_index == MAX_TX_URBS) {
788 context = &dev->tx_contexts[i];
789 break;
790 }
791 }
792
793 /*
794 * May never happen! When this happens we'd more URBs in flight as
795 * allowed (MAX_TX_URBS).
796 */
797 if (!context) {
997ea58e 798 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
a1c31f1d 799 usb_free_urb(urb);
702171ad 800
aabdfd6a 801 netdev_warn(netdev, "couldn't find free context\n");
702171ad
SH		 802
803 return NETDEV_TX_BUSY;
804 }
805
806 context->dev = dev;
807 context->echo_index = i;
808 context->dlc = cf->can_dlc;
809
810 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
811 size, ems_usb_write_bulk_callback, context);
812 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
813 usb_anchor_urb(urb, &dev->tx_submitted);
814
815 can_put_echo_skb(skb, netdev, context->echo_index);
816
817 atomic_inc(&dev->active_tx_urbs);
818
819 err = usb_submit_urb(urb, GFP_ATOMIC);
820 if (unlikely(err)) {
821 can_free_echo_skb(netdev, context->echo_index);
822
823 usb_unanchor_urb(urb);
997ea58e 824 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
702171ad
SH		 825 dev_kfree_skb(skb);
826
827 atomic_dec(&dev->active_tx_urbs);
828
829 if (err == -ENODEV) {
830 netif_device_detach(netdev);
831 } else {
aabdfd6a 832 netdev_warn(netdev, "failed tx_urb %d\n", err);
702171ad
SH		 833
834 stats->tx_dropped++;
835 }
836 } else {
860e9538 837 netif_trans_update(netdev);
702171ad
SH		 838
839 /* Slow down tx path */
840 if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS ||
90cfde46 841 dev->free_slots < CPC_TX_QUEUE_TRIGGER_LOW) {
702171ad
SH		 842 netif_stop_queue(netdev);
843 }
844 }
845
846 /*
847 * Release our reference to this URB, the USB core will eventually free
848 * it entirely.
849 */
850 usb_free_urb(urb);
851
852 return NETDEV_TX_OK;
853
854nomem:
ea3fb371 855 dev_kfree_skb(skb);
702171ad
SH		 856 stats->tx_dropped++;
857
858 return NETDEV_TX_OK;
859}
860
861static int ems_usb_close(struct net_device *netdev)
862{
863 struct ems_usb *dev = netdev_priv(netdev);
864
865 /* Stop polling */
866 unlink_all_urbs(dev);
867
868 netif_stop_queue(netdev);
869
870 /* Set CAN controller to reset mode */
871 if (ems_usb_write_mode(dev, SJA1000_MOD_RM))
aabdfd6a 872 netdev_warn(netdev, "couldn't stop device");
702171ad
SH		 873
874 close_candev(netdev);
875
702171ad
SH		 876 return 0;
877}
878
879static const struct net_device_ops ems_usb_netdev_ops = {
880 .ndo_open = ems_usb_open,
881 .ndo_stop = ems_usb_close,
882 .ndo_start_xmit = ems_usb_start_xmit,
c971fa2a 883 .ndo_change_mtu = can_change_mtu,
702171ad
SH		 884};
885
194b9a4c 886static const struct can_bittiming_const ems_usb_bittiming_const = {
702171ad
SH		 887 .name = "ems_usb",
888 .tseg1_min = 1,
889 .tseg1_max = 16,
890 .tseg2_min = 1,
891 .tseg2_max = 8,
892 .sjw_max = 4,
893 .brp_min = 1,
894 .brp_max = 64,
895 .brp_inc = 1,
896};
897
898static int ems_usb_set_mode(struct net_device *netdev, enum can_mode mode)
899{
900 struct ems_usb *dev = netdev_priv(netdev);
901
702171ad
SH		 902 switch (mode) {
903 case CAN_MODE_START:
904 if (ems_usb_write_mode(dev, SJA1000_MOD_NORMAL))
aabdfd6a 905 netdev_warn(netdev, "couldn't start device");
702171ad
SH		 906
907 if (netif_queue_stopped(netdev))
908 netif_wake_queue(netdev);
909 break;
910
911 default:
912 return -EOPNOTSUPP;
913 }
914
915 return 0;
916}
917
918static int ems_usb_set_bittiming(struct net_device *netdev)
919{
920 struct ems_usb *dev = netdev_priv(netdev);
921 struct can_bittiming *bt = &dev->can.bittiming;
922 u8 btr0, btr1;
923
924 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
925 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
926 (((bt->phase_seg2 - 1) & 0x7) << 4);
927 if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
928 btr1 |= 0x80;
929
aabdfd6a 930 netdev_info(netdev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
702171ad
SH		 931
932 dev->active_params.msg.can_params.cc_params.sja1000.btr0 = btr0;
933 dev->active_params.msg.can_params.cc_params.sja1000.btr1 = btr1;
934
935 return ems_usb_command_msg(dev, &dev->active_params);
936}
937
938static void init_params_sja1000(struct ems_cpc_msg *msg)
939{
940 struct cpc_sja1000_params *sja1000 =
941 &msg->msg.can_params.cc_params.sja1000;
942
943 msg->type = CPC_CMD_TYPE_CAN_PARAMS;
944 msg->length = sizeof(struct cpc_can_params);
945 msg->msgid = 0;
946
947 msg->msg.can_params.cc_type = CPC_CC_TYPE_SJA1000;
948
949 /* Acceptance filter open */
950 sja1000->acc_code0 = 0x00;
951 sja1000->acc_code1 = 0x00;
952 sja1000->acc_code2 = 0x00;
953 sja1000->acc_code3 = 0x00;
954
955 /* Acceptance filter open */
956 sja1000->acc_mask0 = 0xFF;
957 sja1000->acc_mask1 = 0xFF;
958 sja1000->acc_mask2 = 0xFF;
959 sja1000->acc_mask3 = 0xFF;
960
961 sja1000->btr0 = 0;
962 sja1000->btr1 = 0;
963
964 sja1000->outp_contr = SJA1000_DEFAULT_OUTPUT_CONTROL;
965 sja1000->mode = SJA1000_MOD_RM;
966}
967
968/*
969 * probe function for new CPC-USB devices
970 */
971static int ems_usb_probe(struct usb_interface *intf,
972 const struct usb_device_id *id)
973{
974 struct net_device *netdev;
975 struct ems_usb *dev;
976 int i, err = -ENOMEM;
977
a6e4bc53 978 netdev = alloc_candev(sizeof(struct ems_usb), MAX_TX_URBS);
702171ad 979 if (!netdev) {
1c0b28b1 980 dev_err(&intf->dev, "ems_usb: Couldn't alloc candev\n");
702171ad
SH		 981 return -ENOMEM;
982 }
983
984 dev = netdev_priv(netdev);
985
986 dev->udev = interface_to_usbdev(intf);
987 dev->netdev = netdev;
988
989 dev->can.state = CAN_STATE_STOPPED;
990 dev->can.clock.freq = EMS_USB_ARM7_CLOCK;
991 dev->can.bittiming_const = &ems_usb_bittiming_const;
992 dev->can.do_set_bittiming = ems_usb_set_bittiming;
993 dev->can.do_set_mode = ems_usb_set_mode;
ad72c347 994 dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
702171ad 995
702171ad
SH		 996 netdev->netdev_ops = &ems_usb_netdev_ops;
997
998 netdev->flags |= IFF_ECHO; /* we support local echo */
999
1000 init_usb_anchor(&dev->rx_submitted);
1001
1002 init_usb_anchor(&dev->tx_submitted);
1003 atomic_set(&dev->active_tx_urbs, 0);
1004
1005 for (i = 0; i < MAX_TX_URBS; i++)
1006 dev->tx_contexts[i].echo_index = MAX_TX_URBS;
1007
1008 dev->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
87ced2f9 1009 if (!dev->intr_urb)
702171ad 1010 goto cleanup_candev;
702171ad
SH		 1011
1012 dev->intr_in_buffer = kzalloc(INTR_IN_BUFFER_SIZE, GFP_KERNEL);
09da6c5f 1013 if (!dev->intr_in_buffer)
702171ad 1014 goto cleanup_intr_urb;
702171ad
SH		 1015
1016 dev->tx_msg_buffer = kzalloc(CPC_HEADER_SIZE +
1017 sizeof(struct ems_cpc_msg), GFP_KERNEL);
14f8dc49 1018 if (!dev->tx_msg_buffer)
702171ad 1019 goto cleanup_intr_in_buffer;
702171ad
SH		 1020
1021 usb_set_intfdata(intf, dev);
1022
1023 SET_NETDEV_DEV(netdev, &intf->dev);
1024
1025 init_params_sja1000(&dev->active_params);
1026
1027 err = ems_usb_command_msg(dev, &dev->active_params);
1028 if (err) {
aabdfd6a 1029 netdev_err(netdev, "couldn't initialize controller: %d\n", err);
702171ad
SH		 1030 goto cleanup_tx_msg_buffer;
1031 }
1032
1033 err = register_candev(netdev);
1034 if (err) {
aabdfd6a 1035 netdev_err(netdev, "couldn't register CAN device: %d\n", err);
702171ad
SH		 1036 goto cleanup_tx_msg_buffer;
1037 }
1038
1039 return 0;
1040
1041cleanup_tx_msg_buffer:
1042 kfree(dev->tx_msg_buffer);
1043
1044cleanup_intr_in_buffer:
1045 kfree(dev->intr_in_buffer);
1046
1047cleanup_intr_urb:
1048 usb_free_urb(dev->intr_urb);
1049
1050cleanup_candev:
1051 free_candev(netdev);
1052
1053 return err;
1054}
1055
1056/*
1057 * called by the usb core when the device is removed from the system
1058 */
1059static void ems_usb_disconnect(struct usb_interface *intf)
1060{
1061 struct ems_usb *dev = usb_get_intfdata(intf);
1062
1063 usb_set_intfdata(intf, NULL);
1064
1065 if (dev) {
1066 unregister_netdev(dev->netdev);
1067 free_candev(dev->netdev);
1068
1069 unlink_all_urbs(dev);
1070
1071 usb_free_urb(dev->intr_urb);
1072
1073 kfree(dev->intr_in_buffer);
1074 }
1075}
1076
1077/* usb specific object needed to register this driver with the usb subsystem */
1078static struct usb_driver ems_usb_driver = {
1079 .name = "ems_usb",
1080 .probe = ems_usb_probe,
1081 .disconnect = ems_usb_disconnect,
1082 .id_table = ems_usb_table,
1083};
1084
d632eb1b 1085module_usb_driver(ems_usb_driver);
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