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[ARM] pxa: Gumstix Verdex PCMCIA support
[linux-2.6/verdex.git] / drivers / net / can / usb / ems_usb.c
blob9012e0abc62674816869cdfb80edceaa6c6b61e3
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
30 MODULE_AUTHOR("Sebastian Haas <haas@ems-wuensche.com>");
31 MODULE_DESCRIPTION("CAN driver for EMS Dr. Thomas Wuensche CAN/USB interfaces");
32 MODULE_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 */
126 struct 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 */
133 struct 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 */
149 struct 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 */
159 struct cpc_confirm {
160 u8 error; /* error code */
161 };
162
163 /* Structure for overrun conditions */
164 struct cpc_overrun {
165 u8 event;
166 u8 count;
167 };
168
169 /* SJA1000 CAN errors (compatible to NXP LPC2119) */
170 struct cpc_sja1000_can_error {
171 u8 ecc;
172 u8 rxerr;
173 u8 txerr;
174 };
175
176 /* structure for CAN error conditions */
177 struct 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 */
194 struct cpc_can_err_counter {
195 u8 rx;
196 u8 tx;
197 };
198
199 /* Main message type used between library and application */
200 struct __attribute__ ((packed)) ems_cpc_msg {
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 */
223 static struct usb_device_id ems_usb_table[] = {
224 {USB_DEVICE(USB_CPCUSB_VENDOR_ID, USB_CPCUSB_ARM7_PRODUCT_ID)},
225 {} /* Terminating entry */
226 };
227
228 MODULE_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
235 #define MAX_TX_URBS CAN_ECHO_SKB_MAX
236
237 struct ems_usb;
238
239 struct ems_tx_urb_context {
240 struct ems_usb *dev;
241
242 u32 echo_index;
243 u8 dlc;
244 };
245
246 struct ems_usb {
247 struct can_priv can; /* must be the first member */
248 int open_time;
249
250 struct sk_buff *echo_skb[MAX_TX_URBS];
251
252 struct usb_device *udev;
253 struct net_device *netdev;
254
255 atomic_t active_tx_urbs;
256 struct usb_anchor tx_submitted;
257 struct ems_tx_urb_context tx_contexts[MAX_TX_URBS];
258
259 struct usb_anchor rx_submitted;
260
261 struct urb *intr_urb;
262
263 u8 *tx_msg_buffer;
264
265 u8 *intr_in_buffer;
266 unsigned int free_slots; /* remember number of available slots */
267
268 struct ems_cpc_msg active_params; /* active controller parameters */
269 };
270
271 static void ems_usb_read_interrupt_callback(struct urb *urb)
272 {
273 struct ems_usb *dev = urb->context;
274 struct net_device *netdev = dev->netdev;
275 int err;
276
277 if (!netif_device_present(netdev))
278 return;
279
280 switch (urb->status) {
281 case 0:
282 dev->free_slots = dev->intr_in_buffer[1];
283 break;
284
285 case -ECONNRESET: /* unlink */
286 case -ENOENT:
287 case -ESHUTDOWN:
288 return;
289
290 default:
291 dev_info(netdev->dev.parent, "Rx interrupt aborted %d\n",
292 urb->status);
293 break;
294 }
295
296 err = usb_submit_urb(urb, GFP_ATOMIC);
297
298 if (err == -ENODEV)
299 netif_device_detach(netdev);
300 else if (err)
301 dev_err(netdev->dev.parent,
302 "failed resubmitting intr urb: %d\n", err);
303
304 return;
305 }
306
307 static void ems_usb_rx_can_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
308 {
309 struct can_frame *cf;
310 struct sk_buff *skb;
311 int i;
312 struct net_device_stats *stats = &dev->netdev->stats;
313
314 skb = netdev_alloc_skb(dev->netdev, sizeof(struct can_frame));
315 if (skb == NULL)
316 return;
317
318 skb->protocol = htons(ETH_P_CAN);
319
320 cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
321
322 cf->can_id = msg->msg.can_msg.id;
323 cf->can_dlc = min_t(u8, msg->msg.can_msg.length, 8);
324
325 if (msg->type == CPC_MSG_TYPE_EXT_CAN_FRAME
326 || msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME)
327 cf->can_id |= CAN_EFF_FLAG;
328
329 if (msg->type == CPC_MSG_TYPE_RTR_FRAME
330 || msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME) {
331 cf->can_id |= CAN_RTR_FLAG;
332 } else {
333 for (i = 0; i < cf->can_dlc; i++)
334 cf->data[i] = msg->msg.can_msg.msg[i];
335 }
336
337 netif_rx(skb);
338
339 stats->rx_packets++;
340 stats->rx_bytes += cf->can_dlc;
341 }
342
343 static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg)
344 {
345 struct can_frame *cf;
346 struct sk_buff *skb;
347 struct net_device_stats *stats = &dev->netdev->stats;
348
349 skb = netdev_alloc_skb(dev->netdev, sizeof(struct can_frame));
350 if (skb == NULL)
351 return;
352
353 skb->protocol = htons(ETH_P_CAN);
354
355 cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
356 memset(cf, 0, sizeof(struct can_frame));
357
358 cf->can_id = CAN_ERR_FLAG;
359 cf->can_dlc = CAN_ERR_DLC;
360
361 if (msg->type == CPC_MSG_TYPE_CAN_STATE) {
362 u8 state = msg->msg.can_state;
363
364 if (state & SJA1000_SR_BS) {
365 dev->can.state = CAN_STATE_BUS_OFF;
366 cf->can_id |= CAN_ERR_BUSOFF;
367
368 can_bus_off(dev->netdev);
369 } else if (state & SJA1000_SR_ES) {
370 dev->can.state = CAN_STATE_ERROR_WARNING;
371 dev->can.can_stats.error_warning++;
372 } else {
373 dev->can.state = CAN_STATE_ERROR_ACTIVE;
374 dev->can.can_stats.error_passive++;
375 }
376 } else if (msg->type == CPC_MSG_TYPE_CAN_FRAME_ERROR) {
377 u8 ecc = msg->msg.error.cc.regs.sja1000.ecc;
378 u8 txerr = msg->msg.error.cc.regs.sja1000.txerr;
379 u8 rxerr = msg->msg.error.cc.regs.sja1000.rxerr;
380
381 /* bus error interrupt */
382 dev->can.can_stats.bus_error++;
383 stats->rx_errors++;
384
385 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
386
387 switch (ecc & SJA1000_ECC_MASK) {
388 case SJA1000_ECC_BIT:
389 cf->data[2] |= CAN_ERR_PROT_BIT;
390 break;
391 case SJA1000_ECC_FORM:
392 cf->data[2] |= CAN_ERR_PROT_FORM;
393 break;
394 case SJA1000_ECC_STUFF:
395 cf->data[2] |= CAN_ERR_PROT_STUFF;
396 break;
397 default:
398 cf->data[2] |= CAN_ERR_PROT_UNSPEC;
399 cf->data[3] = ecc & SJA1000_ECC_SEG;
400 break;
401 }
402
403 /* Error occured during transmission? */
404 if ((ecc & SJA1000_ECC_DIR) == 0)
405 cf->data[2] |= CAN_ERR_PROT_TX;
406
407 if (dev->can.state == CAN_STATE_ERROR_WARNING ||
408 dev->can.state == CAN_STATE_ERROR_PASSIVE) {
409 cf->data[1] = (txerr > rxerr) ?
410 CAN_ERR_CRTL_TX_PASSIVE : CAN_ERR_CRTL_RX_PASSIVE;
411 }
412 } else if (msg->type == CPC_MSG_TYPE_OVERRUN) {
413 cf->can_id |= CAN_ERR_CRTL;
414 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
415
416 stats->rx_over_errors++;
417 stats->rx_errors++;
418 }
419
420 netif_rx(skb);
421
422 stats->rx_packets++;
423 stats->rx_bytes += cf->can_dlc;
424 }
425
426 /*
427 * callback for bulk IN urb
428 */
429 static void ems_usb_read_bulk_callback(struct urb *urb)
430 {
431 struct ems_usb *dev = urb->context;
432 struct net_device *netdev;
433 int retval;
434
435 netdev = dev->netdev;
436
437 if (!netif_device_present(netdev))
438 return;
439
440 switch (urb->status) {
441 case 0: /* success */
442 break;
443
444 case -ENOENT:
445 return;
446
447 default:
448 dev_info(netdev->dev.parent, "Rx URB aborted (%d)\n",
449 urb->status);
450 goto resubmit_urb;
451 }
452
453 if (urb->actual_length > CPC_HEADER_SIZE) {
454 struct ems_cpc_msg *msg;
455 u8 *ibuf = urb->transfer_buffer;
456 u8 msg_count, again, start;
457
458 msg_count = ibuf[0] & ~0x80;
459 again = ibuf[0] & 0x80;
460
461 start = CPC_HEADER_SIZE;
462
463 while (msg_count) {
464 msg = (struct ems_cpc_msg *)&ibuf[start];
465
466 switch (msg->type) {
467 case CPC_MSG_TYPE_CAN_STATE:
468 /* Process CAN state changes */
469 ems_usb_rx_err(dev, msg);
470 break;
471
472 case CPC_MSG_TYPE_CAN_FRAME:
473 case CPC_MSG_TYPE_EXT_CAN_FRAME:
474 case CPC_MSG_TYPE_RTR_FRAME:
475 case CPC_MSG_TYPE_EXT_RTR_FRAME:
476 ems_usb_rx_can_msg(dev, msg);
477 break;
478
479 case CPC_MSG_TYPE_CAN_FRAME_ERROR:
480 /* Process errorframe */
481 ems_usb_rx_err(dev, msg);
482 break;
483
484 case CPC_MSG_TYPE_OVERRUN:
485 /* Message lost while receiving */
486 ems_usb_rx_err(dev, msg);
487 break;
488 }
489
490 start += CPC_MSG_HEADER_LEN + msg->length;
491 msg_count--;
492
493 if (start > urb->transfer_buffer_length) {
494 dev_err(netdev->dev.parent, "format error\n");
495 break;
496 }
497 }
498 }
499
500 resubmit_urb:
501 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2),
502 urb->transfer_buffer, RX_BUFFER_SIZE,
503 ems_usb_read_bulk_callback, dev);
504
505 retval = usb_submit_urb(urb, GFP_ATOMIC);
506
507 if (retval == -ENODEV)
508 netif_device_detach(netdev);
509 else if (retval)
510 dev_err(netdev->dev.parent,
511 "failed resubmitting read bulk urb: %d\n", retval);
512
513 return;
514 }
515
516 /*
517 * callback for bulk IN urb
518 */
519 static void ems_usb_write_bulk_callback(struct urb *urb)
520 {
521 struct ems_tx_urb_context *context = urb->context;
522 struct ems_usb *dev;
523 struct net_device *netdev;
524
525 BUG_ON(!context);
526
527 dev = context->dev;
528 netdev = dev->netdev;
529
530 /* free up our allocated buffer */
531 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
532 urb->transfer_buffer, urb->transfer_dma);
533
534 atomic_dec(&dev->active_tx_urbs);
535
536 if (!netif_device_present(netdev))
537 return;
538
539 if (urb->status)
540 dev_info(netdev->dev.parent, "Tx URB aborted (%d)\n",
541 urb->status);
542
543 netdev->trans_start = jiffies;
544
545 /* transmission complete interrupt */
546 netdev->stats.tx_packets++;
547 netdev->stats.tx_bytes += context->dlc;
548
549 can_get_echo_skb(netdev, context->echo_index);
550
551 /* Release context */
552 context->echo_index = MAX_TX_URBS;
553
554 if (netif_queue_stopped(netdev))
555 netif_wake_queue(netdev);
556 }
557
558 /*
559 * Send the given CPC command synchronously
560 */
561 static int ems_usb_command_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
562 {
563 int actual_length;
564
565 /* Copy payload */
566 memcpy(&dev->tx_msg_buffer[CPC_HEADER_SIZE], msg,
567 msg->length + CPC_MSG_HEADER_LEN);
568
569 /* Clear header */
570 memset(&dev->tx_msg_buffer[0], 0, CPC_HEADER_SIZE);
571
572 return usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2),
573 &dev->tx_msg_buffer[0],
574 msg->length + CPC_MSG_HEADER_LEN + CPC_HEADER_SIZE,
575 &actual_length, 1000);
576 }
577
578 /*
579 * Change CAN controllers' mode register
580 */
581 static int ems_usb_write_mode(struct ems_usb *dev, u8 mode)
582 {
583 dev->active_params.msg.can_params.cc_params.sja1000.mode = mode;
584
585 return ems_usb_command_msg(dev, &dev->active_params);
586 }
587
588 /*
589 * Send a CPC_Control command to change behaviour when interface receives a CAN
590 * message, bus error or CAN state changed notifications.
591 */
592 static int ems_usb_control_cmd(struct ems_usb *dev, u8 val)
593 {
594 struct ems_cpc_msg cmd;
595
596 cmd.type = CPC_CMD_TYPE_CONTROL;
597 cmd.length = CPC_MSG_HEADER_LEN + 1;
598
599 cmd.msgid = 0;
600
601 cmd.msg.generic[0] = val;
602
603 return ems_usb_command_msg(dev, &cmd);
604 }
605
606 /*
607 * Start interface
608 */
609 static int ems_usb_start(struct ems_usb *dev)
610 {
611 struct net_device *netdev = dev->netdev;
612 int err, i;
613
614 dev->intr_in_buffer[0] = 0;
615 dev->free_slots = 15; /* initial size */
616
617 for (i = 0; i < MAX_RX_URBS; i++) {
618 struct urb *urb = NULL;
619 u8 *buf = NULL;
620
621 /* create a URB, and a buffer for it */
622 urb = usb_alloc_urb(0, GFP_KERNEL);
623 if (!urb) {
624 dev_err(netdev->dev.parent,
625 "No memory left for URBs\n");
626 return -ENOMEM;
627 }
628
629 buf = usb_buffer_alloc(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
630 &urb->transfer_dma);
631 if (!buf) {
632 dev_err(netdev->dev.parent,
633 "No memory left for USB buffer\n");
634 usb_free_urb(urb);
635 return -ENOMEM;
636 }
637
638 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2),
639 buf, RX_BUFFER_SIZE,
640 ems_usb_read_bulk_callback, dev);
641 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
642 usb_anchor_urb(urb, &dev->rx_submitted);
643
644 err = usb_submit_urb(urb, GFP_KERNEL);
645 if (err) {
646 if (err == -ENODEV)
647 netif_device_detach(dev->netdev);
648
649 usb_unanchor_urb(urb);
650 usb_buffer_free(dev->udev, RX_BUFFER_SIZE, buf,
651 urb->transfer_dma);
652 break;
653 }
654
655 /* Drop reference, USB core will take care of freeing it */
656 usb_free_urb(urb);
657 }
658
659 /* Did we submit any URBs */
660 if (i == 0) {
661 dev_warn(netdev->dev.parent, "couldn't setup read URBs\n");
662 return err;
663 }
664
665 /* Warn if we've couldn't transmit all the URBs */
666 if (i < MAX_RX_URBS)
667 dev_warn(netdev->dev.parent, "rx performance may be slow\n");
668
669 /* Setup and start interrupt URB */
670 usb_fill_int_urb(dev->intr_urb, dev->udev,
671 usb_rcvintpipe(dev->udev, 1),
672 dev->intr_in_buffer,
673 INTR_IN_BUFFER_SIZE,
674 ems_usb_read_interrupt_callback, dev, 1);
675
676 err = usb_submit_urb(dev->intr_urb, GFP_KERNEL);
677 if (err) {
678 if (err == -ENODEV)
679 netif_device_detach(dev->netdev);
680
681 dev_warn(netdev->dev.parent, "intr URB submit failed: %d\n",
682 err);
683
684 return err;
685 }
686
687 /* CPC-USB will transfer received message to host */
688 err = ems_usb_control_cmd(dev, CONTR_CAN_MESSAGE | CONTR_CONT_ON);
689 if (err)
690 goto failed;
691
692 /* CPC-USB will transfer CAN state changes to host */
693 err = ems_usb_control_cmd(dev, CONTR_CAN_STATE | CONTR_CONT_ON);
694 if (err)
695 goto failed;
696
697 /* CPC-USB will transfer bus errors to host */
698 err = ems_usb_control_cmd(dev, CONTR_BUS_ERROR | CONTR_CONT_ON);
699 if (err)
700 goto failed;
701
702 err = ems_usb_write_mode(dev, SJA1000_MOD_NORMAL);
703 if (err)
704 goto failed;
705
706 dev->can.state = CAN_STATE_ERROR_ACTIVE;
707
708 return 0;
709
710 failed:
711 if (err == -ENODEV)
712 netif_device_detach(dev->netdev);
713
714 dev_warn(netdev->dev.parent, "couldn't submit control: %d\n", err);
715
716 return err;
717 }
718
719 static void unlink_all_urbs(struct ems_usb *dev)
720 {
721 int i;
722
723 usb_unlink_urb(dev->intr_urb);
724
725 usb_kill_anchored_urbs(&dev->rx_submitted);
726
727 usb_kill_anchored_urbs(&dev->tx_submitted);
728 atomic_set(&dev->active_tx_urbs, 0);
729
730 for (i = 0; i < MAX_TX_URBS; i++)
731 dev->tx_contexts[i].echo_index = MAX_TX_URBS;
732 }
733
734 static int ems_usb_open(struct net_device *netdev)
735 {
736 struct ems_usb *dev = netdev_priv(netdev);
737 int err;
738
739 err = ems_usb_write_mode(dev, SJA1000_MOD_RM);
740 if (err)
741 return err;
742
743 /* common open */
744 err = open_candev(netdev);
745 if (err)
746 return err;
747
748 /* finally start device */
749 err = ems_usb_start(dev);
750 if (err) {
751 if (err == -ENODEV)
752 netif_device_detach(dev->netdev);
753
754 dev_warn(netdev->dev.parent, "couldn't start device: %d\n",
755 err);
756
757 close_candev(netdev);
758
759 return err;
760 }
761
762 dev->open_time = jiffies;
763
764 netif_start_queue(netdev);
765
766 return 0;
767 }
768
769 static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *netdev)
770 {
771 struct ems_usb *dev = netdev_priv(netdev);
772 struct ems_tx_urb_context *context = NULL;
773 struct net_device_stats *stats = &netdev->stats;
774 struct can_frame *cf = (struct can_frame *)skb->data;
775 struct ems_cpc_msg *msg;
776 struct urb *urb;
777 u8 *buf;
778 int i, err;
779 size_t size = CPC_HEADER_SIZE + CPC_MSG_HEADER_LEN
780 + sizeof(struct cpc_can_msg);
781
782 /* create a URB, and a buffer for it, and copy the data to the URB */
783 urb = usb_alloc_urb(0, GFP_ATOMIC);
784 if (!urb) {
785 dev_err(netdev->dev.parent, "No memory left for URBs\n");
786 goto nomem;
787 }
788
789 buf = usb_buffer_alloc(dev->udev, size, GFP_ATOMIC, &urb->transfer_dma);
790 if (!buf) {
791 dev_err(netdev->dev.parent, "No memory left for USB buffer\n");
792 usb_free_urb(urb);
793 goto nomem;
794 }
795
796 msg = (struct ems_cpc_msg *)&buf[CPC_HEADER_SIZE];
797
798 msg->msg.can_msg.id = cf->can_id & CAN_ERR_MASK;
799 msg->msg.can_msg.length = cf->can_dlc;
800
801 if (cf->can_id & CAN_RTR_FLAG) {
802 msg->type = cf->can_id & CAN_EFF_FLAG ?
803 CPC_CMD_TYPE_EXT_RTR_FRAME : CPC_CMD_TYPE_RTR_FRAME;
804
805 msg->length = CPC_CAN_MSG_MIN_SIZE;
806 } else {
807 msg->type = cf->can_id & CAN_EFF_FLAG ?
808 CPC_CMD_TYPE_EXT_CAN_FRAME : CPC_CMD_TYPE_CAN_FRAME;
809
810 for (i = 0; i < cf->can_dlc; i++)
811 msg->msg.can_msg.msg[i] = cf->data[i];
812
813 msg->length = CPC_CAN_MSG_MIN_SIZE + cf->can_dlc;
814 }
815
816 for (i = 0; i < MAX_TX_URBS; i++) {
817 if (dev->tx_contexts[i].echo_index == MAX_TX_URBS) {
818 context = &dev->tx_contexts[i];
819 break;
820 }
821 }
822
823 /*
824 * May never happen! When this happens we'd more URBs in flight as
825 * allowed (MAX_TX_URBS).
826 */
827 if (!context) {
828 usb_unanchor_urb(urb);
829 usb_buffer_free(dev->udev, size, buf, urb->transfer_dma);
830
831 dev_warn(netdev->dev.parent, "couldn't find free context\n");
832
833 return NETDEV_TX_BUSY;
834 }
835
836 context->dev = dev;
837 context->echo_index = i;
838 context->dlc = cf->can_dlc;
839
840 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
841 size, ems_usb_write_bulk_callback, context);
842 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
843 usb_anchor_urb(urb, &dev->tx_submitted);
844
845 can_put_echo_skb(skb, netdev, context->echo_index);
846
847 atomic_inc(&dev->active_tx_urbs);
848
849 err = usb_submit_urb(urb, GFP_ATOMIC);
850 if (unlikely(err)) {
851 can_free_echo_skb(netdev, context->echo_index);
852
853 usb_unanchor_urb(urb);
854 usb_buffer_free(dev->udev, size, buf, urb->transfer_dma);
855 dev_kfree_skb(skb);
856
857 atomic_dec(&dev->active_tx_urbs);
858
859 if (err == -ENODEV) {
860 netif_device_detach(netdev);
861 } else {
862 dev_warn(netdev->dev.parent, "failed tx_urb %d\n", err);
863
864 stats->tx_dropped++;
865 }
866 } else {
867 netdev->trans_start = jiffies;
868
869 /* Slow down tx path */
870 if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS ||
871 dev->free_slots < 5) {
872 netif_stop_queue(netdev);
873 }
874 }
875
876 /*
877 * Release our reference to this URB, the USB core will eventually free
878 * it entirely.
879 */
880 usb_free_urb(urb);
881
882 return NETDEV_TX_OK;
883
884 nomem:
885 if (skb)
886 dev_kfree_skb(skb);
887
888 stats->tx_dropped++;
889
890 return NETDEV_TX_OK;
891 }
892
893 static int ems_usb_close(struct net_device *netdev)
894 {
895 struct ems_usb *dev = netdev_priv(netdev);
896
897 /* Stop polling */
898 unlink_all_urbs(dev);
899
900 netif_stop_queue(netdev);
901
902 /* Set CAN controller to reset mode */
903 if (ems_usb_write_mode(dev, SJA1000_MOD_RM))
904 dev_warn(netdev->dev.parent, "couldn't stop device");
905
906 close_candev(netdev);
907
908 dev->open_time = 0;
909
910 return 0;
911 }
912
913 static const struct net_device_ops ems_usb_netdev_ops = {
914 .ndo_open = ems_usb_open,
915 .ndo_stop = ems_usb_close,
916 .ndo_start_xmit = ems_usb_start_xmit,
917 };
918
919 static struct can_bittiming_const ems_usb_bittiming_const = {
920 .name = "ems_usb",
921 .tseg1_min = 1,
922 .tseg1_max = 16,
923 .tseg2_min = 1,
924 .tseg2_max = 8,
925 .sjw_max = 4,
926 .brp_min = 1,
927 .brp_max = 64,
928 .brp_inc = 1,
929 };
930
931 static int ems_usb_set_mode(struct net_device *netdev, enum can_mode mode)
932 {
933 struct ems_usb *dev = netdev_priv(netdev);
934
935 if (!dev->open_time)
936 return -EINVAL;
937
938 switch (mode) {
939 case CAN_MODE_START:
940 if (ems_usb_write_mode(dev, SJA1000_MOD_NORMAL))
941 dev_warn(netdev->dev.parent, "couldn't start device");
942
943 if (netif_queue_stopped(netdev))
944 netif_wake_queue(netdev);
945 break;
946
947 default:
948 return -EOPNOTSUPP;
949 }
950
951 return 0;
952 }
953
954 static int ems_usb_set_bittiming(struct net_device *netdev)
955 {
956 struct ems_usb *dev = netdev_priv(netdev);
957 struct can_bittiming *bt = &dev->can.bittiming;
958 u8 btr0, btr1;
959
960 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
961 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
962 (((bt->phase_seg2 - 1) & 0x7) << 4);
963 if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
964 btr1 |= 0x80;
965
966 dev_info(netdev->dev.parent, "setting BTR0=0x%02x BTR1=0x%02x\n",
967 btr0, btr1);
968
969 dev->active_params.msg.can_params.cc_params.sja1000.btr0 = btr0;
970 dev->active_params.msg.can_params.cc_params.sja1000.btr1 = btr1;
971
972 return ems_usb_command_msg(dev, &dev->active_params);
973 }
974
975 static void init_params_sja1000(struct ems_cpc_msg *msg)
976 {
977 struct cpc_sja1000_params *sja1000 =
978 &msg->msg.can_params.cc_params.sja1000;
979
980 msg->type = CPC_CMD_TYPE_CAN_PARAMS;
981 msg->length = sizeof(struct cpc_can_params);
982 msg->msgid = 0;
983
984 msg->msg.can_params.cc_type = CPC_CC_TYPE_SJA1000;
985
986 /* Acceptance filter open */
987 sja1000->acc_code0 = 0x00;
988 sja1000->acc_code1 = 0x00;
989 sja1000->acc_code2 = 0x00;
990 sja1000->acc_code3 = 0x00;
991
992 /* Acceptance filter open */
993 sja1000->acc_mask0 = 0xFF;
994 sja1000->acc_mask1 = 0xFF;
995 sja1000->acc_mask2 = 0xFF;
996 sja1000->acc_mask3 = 0xFF;
997
998 sja1000->btr0 = 0;
999 sja1000->btr1 = 0;
1000
1001 sja1000->outp_contr = SJA1000_DEFAULT_OUTPUT_CONTROL;
1002 sja1000->mode = SJA1000_MOD_RM;
1003 }
1004
1005 /*
1006 * probe function for new CPC-USB devices
1007 */
1008 static int ems_usb_probe(struct usb_interface *intf,
1009 const struct usb_device_id *id)
1010 {
1011 struct net_device *netdev;
1012 struct ems_usb *dev;
1013 int i, err = -ENOMEM;
1014
1015 netdev = alloc_candev(sizeof(struct ems_usb));
1016 if (!netdev) {
1017 dev_err(netdev->dev.parent, "Couldn't alloc candev\n");
1018 return -ENOMEM;
1019 }
1020
1021 dev = netdev_priv(netdev);
1022
1023 dev->udev = interface_to_usbdev(intf);
1024 dev->netdev = netdev;
1025
1026 dev->can.state = CAN_STATE_STOPPED;
1027 dev->can.clock.freq = EMS_USB_ARM7_CLOCK;
1028 dev->can.bittiming_const = &ems_usb_bittiming_const;
1029 dev->can.do_set_bittiming = ems_usb_set_bittiming;
1030 dev->can.do_set_mode = ems_usb_set_mode;
1031
1032 netdev->flags |= IFF_ECHO; /* we support local echo */
1033
1034 netdev->netdev_ops = &ems_usb_netdev_ops;
1035
1036 netdev->flags |= IFF_ECHO; /* we support local echo */
1037
1038 init_usb_anchor(&dev->rx_submitted);
1039
1040 init_usb_anchor(&dev->tx_submitted);
1041 atomic_set(&dev->active_tx_urbs, 0);
1042
1043 for (i = 0; i < MAX_TX_URBS; i++)
1044 dev->tx_contexts[i].echo_index = MAX_TX_URBS;
1045
1046 dev->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
1047 if (!dev->intr_urb) {
1048 dev_err(netdev->dev.parent, "Couldn't alloc intr URB\n");
1049 goto cleanup_candev;
1050 }
1051
1052 dev->intr_in_buffer = kzalloc(INTR_IN_BUFFER_SIZE, GFP_KERNEL);
1053 if (!dev->intr_in_buffer) {
1054 dev_err(netdev->dev.parent, "Couldn't alloc Intr buffer\n");
1055 goto cleanup_intr_urb;
1056 }
1057
1058 dev->tx_msg_buffer = kzalloc(CPC_HEADER_SIZE +
1059 sizeof(struct ems_cpc_msg), GFP_KERNEL);
1060 if (!dev->tx_msg_buffer) {
1061 dev_err(netdev->dev.parent, "Couldn't alloc Tx buffer\n");
1062 goto cleanup_intr_in_buffer;
1063 }
1064
1065 usb_set_intfdata(intf, dev);
1066
1067 SET_NETDEV_DEV(netdev, &intf->dev);
1068
1069 init_params_sja1000(&dev->active_params);
1070
1071 err = ems_usb_command_msg(dev, &dev->active_params);
1072 if (err) {
1073 dev_err(netdev->dev.parent,
1074 "couldn't initialize controller: %d\n", err);
1075 goto cleanup_tx_msg_buffer;
1076 }
1077
1078 err = register_candev(netdev);
1079 if (err) {
1080 dev_err(netdev->dev.parent,
1081 "couldn't register CAN device: %d\n", err);
1082 goto cleanup_tx_msg_buffer;
1083 }
1084
1085 return 0;
1086
1087 cleanup_tx_msg_buffer:
1088 kfree(dev->tx_msg_buffer);
1089
1090 cleanup_intr_in_buffer:
1091 kfree(dev->intr_in_buffer);
1092
1093 cleanup_intr_urb:
1094 usb_free_urb(dev->intr_urb);
1095
1096 cleanup_candev:
1097 free_candev(netdev);
1098
1099 return err;
1100 }
1101
1102 /*
1103 * called by the usb core when the device is removed from the system
1104 */
1105 static void ems_usb_disconnect(struct usb_interface *intf)
1106 {
1107 struct ems_usb *dev = usb_get_intfdata(intf);
1108
1109 usb_set_intfdata(intf, NULL);
1110
1111 if (dev) {
1112 unregister_netdev(dev->netdev);
1113 free_candev(dev->netdev);
1114
1115 unlink_all_urbs(dev);
1116
1117 usb_free_urb(dev->intr_urb);
1118
1119 kfree(dev->intr_in_buffer);
1120 }
1121 }
1122
1123 /* usb specific object needed to register this driver with the usb subsystem */
1124 static struct usb_driver ems_usb_driver = {
1125 .name = "ems_usb",
1126 .probe = ems_usb_probe,
1127 .disconnect = ems_usb_disconnect,
1128 .id_table = ems_usb_table,
1129 };
1130
1131 static int __init ems_usb_init(void)
1132 {
1133 int err;
1134
1135 printk(KERN_INFO "CPC-USB kernel driver loaded\n");
1136
1137 /* register this driver with the USB subsystem */
1138 err = usb_register(&ems_usb_driver);
1139
1140 if (err) {
1141 err("usb_register failed. Error number %d\n", err);
1142 return err;
1143 }
1144
1145 return 0;
1146 }
1147
1148 static void __exit ems_usb_exit(void)
1149 {
1150 /* deregister this driver with the USB subsystem */
1151 usb_deregister(&ems_usb_driver);
1152 }
1153
1154 module_init(ems_usb_init);
1155 module_exit(ems_usb_exit);
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