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Merge branch 'pm-cpufreq'
[linux-2.6-block.git] / drivers / net / can / usb / peak_usb / pcan_usb_fd.c
CommitLineData
0a25e1f4
SG		 1/*
2 * CAN driver for PEAK System PCAN-USB FD / PCAN-USB Pro FD adapter
3 *
4 * Copyright (C) 2013-2014 Stephane Grosjean <s.grosjean@peak-system.com>
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#include <linux/netdevice.h>
16#include <linux/usb.h>
17#include <linux/module.h>
18
19#include <linux/can.h>
20#include <linux/can/dev.h>
21#include <linux/can/error.h>
22
23#include "pcan_usb_core.h"
24#include "pcan_usb_pro.h"
25#include "pcan_ucan.h"
26
27MODULE_SUPPORTED_DEVICE("PEAK-System PCAN-USB FD adapter");
28MODULE_SUPPORTED_DEVICE("PEAK-System PCAN-USB Pro FD adapter");
29
30#define PCAN_USBPROFD_CHANNEL_COUNT 2
31#define PCAN_USBFD_CHANNEL_COUNT 1
32
33/* PCAN-USB Pro FD adapter internal clock (Hz) */
34#define PCAN_UFD_CRYSTAL_HZ 80000000
35
36#define PCAN_UFD_CMD_BUFFER_SIZE 512
37#define PCAN_UFD_LOSPD_PKT_SIZE 64
38
39/* PCAN-USB Pro FD command timeout (ms.) */
40#define PCAN_UFD_CMD_TIMEOUT_MS 1000
41
42/* PCAN-USB Pro FD rx/tx buffers size */
43#define PCAN_UFD_RX_BUFFER_SIZE 2048
44#define PCAN_UFD_TX_BUFFER_SIZE 512
45
46/* read some versions info from the hw devcie */
47struct __packed pcan_ufd_fw_info {
48 __le16 size_of; /* sizeof this */
49 __le16 type; /* type of this structure */
50 u8 hw_type; /* Type of hardware (HW_TYPE_xxx) */
51 u8 bl_version[3]; /* Bootloader version */
52 u8 hw_version; /* Hardware version (PCB) */
53 u8 fw_version[3]; /* Firmware version */
54 __le32 dev_id[2]; /* "device id" per CAN */
55 __le32 ser_no; /* S/N */
56 __le32 flags; /* special functions */
57};
58
59/* handle device specific info used by the netdevices */
60struct pcan_usb_fd_if {
61 struct peak_usb_device *dev[PCAN_USB_MAX_CHANNEL];
62 struct pcan_ufd_fw_info fw_info;
63 struct peak_time_ref time_ref;
64 int cm_ignore_count;
65 int dev_opened_count;
66};
67
68/* device information */
69struct pcan_usb_fd_device {
70 struct peak_usb_device dev;
71 struct can_berr_counter bec;
72 struct pcan_usb_fd_if *usb_if;
73 u8 *cmd_buffer_addr;
74};
75
76/* Extended USB commands (non uCAN commands) */
77
78/* Clock Modes command */
79#define PCAN_UFD_CMD_CLK_SET 0x80
80
81#define PCAN_UFD_CLK_80MHZ 0x0
82#define PCAN_UFD_CLK_60MHZ 0x1
83#define PCAN_UFD_CLK_40MHZ 0x2
84#define PCAN_UFD_CLK_30MHZ 0x3
85#define PCAN_UFD_CLK_24MHZ 0x4
86#define PCAN_UFD_CLK_20MHZ 0x5
87#define PCAN_UFD_CLK_DEF PCAN_UFD_CLK_80MHZ
88
89struct __packed pcan_ufd_clock {
90 __le16 opcode_channel;
91
92 u8 mode;
93 u8 unused[5];
94};
95
96/* LED control command */
97#define PCAN_UFD_CMD_LED_SET 0x86
98
99#define PCAN_UFD_LED_DEV 0x00
100#define PCAN_UFD_LED_FAST 0x01
101#define PCAN_UFD_LED_SLOW 0x02
102#define PCAN_UFD_LED_ON 0x03
103#define PCAN_UFD_LED_OFF 0x04
104#define PCAN_UFD_LED_DEF PCAN_UFD_LED_DEV
105
106struct __packed pcan_ufd_led {
107 __le16 opcode_channel;
108
109 u8 mode;
110 u8 unused[5];
111};
112
3ef5247e 113/* Extended usage of uCAN commands CMD_xxx_xx_OPTION for PCAN-USB Pro FD */
0a25e1f4
SG		 114#define PCAN_UFD_FLTEXT_CALIBRATION 0x8000
115
3ef5247e 116struct __packed pcan_ufd_options {
0a25e1f4
SG		 117 __le16 opcode_channel;
118
3ef5247e 119 __le16 ucan_mask;
0a25e1f4
SG		 120 u16 unused;
121 __le16 usb_mask;
122};
123
124/* Extended usage of uCAN messages for PCAN-USB Pro FD */
125#define PCAN_UFD_MSG_CALIBRATION 0x100
126
127struct __packed pcan_ufd_ts_msg {
128 __le16 size;
129 __le16 type;
130 __le32 ts_low;
131 __le32 ts_high;
132 __le16 usb_frame_index;
133 u16 unused;
134};
135
136#define PCAN_UFD_MSG_OVERRUN 0x101
137
138#define PCAN_UFD_OVMSG_CHANNEL(o) ((o)->channel & 0xf)
139
140struct __packed pcan_ufd_ovr_msg {
141 __le16 size;
142 __le16 type;
143 __le32 ts_low;
144 __le32 ts_high;
145 u8 channel;
146 u8 unused[3];
147};
148
149static inline int pufd_omsg_get_channel(struct pcan_ufd_ovr_msg *om)
150{
151 return om->channel & 0xf;
152}
153
154/* Clock mode frequency values */
155static const u32 pcan_usb_fd_clk_freq[6] = {
156 [PCAN_UFD_CLK_80MHZ] = 80000000,
157 [PCAN_UFD_CLK_60MHZ] = 60000000,
158 [PCAN_UFD_CLK_40MHZ] = 40000000,
159 [PCAN_UFD_CLK_30MHZ] = 30000000,
160 [PCAN_UFD_CLK_24MHZ] = 24000000,
161 [PCAN_UFD_CLK_20MHZ] = 20000000
162};
163
164/* return a device USB interface */
165static inline
166struct pcan_usb_fd_if *pcan_usb_fd_dev_if(struct peak_usb_device *dev)
167{
168 struct pcan_usb_fd_device *pdev =
169 container_of(dev, struct pcan_usb_fd_device, dev);
170 return pdev->usb_if;
171}
172
173/* return a device USB commands buffer */
174static inline void *pcan_usb_fd_cmd_buffer(struct peak_usb_device *dev)
175{
176 struct pcan_usb_fd_device *pdev =
177 container_of(dev, struct pcan_usb_fd_device, dev);
178 return pdev->cmd_buffer_addr;
179}
180
181/* send PCAN-USB Pro FD commands synchronously */
182static int pcan_usb_fd_send_cmd(struct peak_usb_device *dev, void *cmd_tail)
183{
184 void *cmd_head = pcan_usb_fd_cmd_buffer(dev);
79d5eedd 185 int err = 0;
0a25e1f4
SG		 186 u8 *packet_ptr;
187 int i, n = 1, packet_len;
188 ptrdiff_t cmd_len;
189
190 /* usb device unregistered? */
191 if (!(dev->state & PCAN_USB_STATE_CONNECTED))
192 return 0;
193
194 /* if a packet is not filled completely by commands, the command list
195 * is terminated with an "end of collection" record.
196 */
197 cmd_len = cmd_tail - cmd_head;
198 if (cmd_len <= (PCAN_UFD_CMD_BUFFER_SIZE - sizeof(u64))) {
199 memset(cmd_tail, 0xff, sizeof(u64));
200 cmd_len += sizeof(u64);
201 }
202
203 packet_ptr = cmd_head;
204
205 /* firmware is not able to re-assemble 512 bytes buffer in full-speed */
206 if ((dev->udev->speed != USB_SPEED_HIGH) &&
207 (cmd_len > PCAN_UFD_LOSPD_PKT_SIZE)) {
208 packet_len = PCAN_UFD_LOSPD_PKT_SIZE;
209 n += cmd_len / packet_len;
210 } else {
211 packet_len = cmd_len;
212 }
213
214 for (i = 0; i < n; i++) {
215 err = usb_bulk_msg(dev->udev,
216 usb_sndbulkpipe(dev->udev,
217 PCAN_USBPRO_EP_CMDOUT),
218 packet_ptr, packet_len,
219 NULL, PCAN_UFD_CMD_TIMEOUT_MS);
220 if (err) {
221 netdev_err(dev->netdev,
222 "sending command failure: %d\n", err);
223 break;
224 }
225
226 packet_ptr += packet_len;
227 }
228
229 return err;
230}
231
232/* build the commands list in the given buffer, to enter operational mode */
233static int pcan_usb_fd_build_restart_cmd(struct peak_usb_device *dev, u8 *buf)
234{
235 struct pucan_wr_err_cnt *prc;
236 struct pucan_command *cmd;
237 u8 *pc = buf;
238
239 /* 1st, reset error counters: */
240 prc = (struct pucan_wr_err_cnt *)pc;
241 prc->opcode_channel = pucan_cmd_opcode_channel(dev,
242 PUCAN_CMD_WR_ERR_CNT);
243
244 /* select both counters */
245 prc->sel_mask = cpu_to_le16(PUCAN_WRERRCNT_TE|PUCAN_WRERRCNT_RE);
246
247 /* and reset their values */
248 prc->tx_counter = 0;
249 prc->rx_counter = 0;
250
251 /* moves the pointer forward */
252 pc += sizeof(struct pucan_wr_err_cnt);
253
0f251e45
SG		 254 /* add command to switch from ISO to non-ISO mode, if fw allows it */
255 if (dev->can.ctrlmode_supported & CAN_CTRLMODE_FD_NON_ISO) {
256 struct pucan_options *puo = (struct pucan_options *)pc;
257
258 puo->opcode_channel =
259 (dev->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO) ?
260 pucan_cmd_opcode_channel(dev,
261 PUCAN_CMD_CLR_DIS_OPTION) :
262 pucan_cmd_opcode_channel(dev, PUCAN_CMD_SET_EN_OPTION);
263
264 puo->options = cpu_to_le16(PUCAN_OPTION_CANDFDISO);
265
266 /* to be sure that no other extended bits will be taken into
267 * account
268 */
269 puo->unused = 0;
270
271 /* moves the pointer forward */
272 pc += sizeof(struct pucan_options);
273 }
274
0a25e1f4
SG		 275 /* next, go back to operational mode */
276 cmd = (struct pucan_command *)pc;
277 cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
278 (dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) ?
279 PUCAN_CMD_LISTEN_ONLY_MODE :
280 PUCAN_CMD_NORMAL_MODE);
281 pc += sizeof(struct pucan_command);
282
283 return pc - buf;
284}
285
286/* set CAN bus on/off */
287static int pcan_usb_fd_set_bus(struct peak_usb_device *dev, u8 onoff)
288{
289 u8 *pc = pcan_usb_fd_cmd_buffer(dev);
290 int l;
291
292 if (onoff) {
293 /* build the cmds list to enter operational mode */
294 l = pcan_usb_fd_build_restart_cmd(dev, pc);
295 } else {
296 struct pucan_command *cmd = (struct pucan_command *)pc;
297
298 /* build cmd to go back to reset mode */
299 cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
300 PUCAN_CMD_RESET_MODE);
301 l = sizeof(struct pucan_command);
302 }
303
304 /* send the command */
305 return pcan_usb_fd_send_cmd(dev, pc + l);
306}
307
308/* set filtering masks:
309 *
310 * idx in range [0..63] selects a row #idx, all rows otherwise
311 * mask in range [0..0xffffffff] defines up to 32 CANIDs in the row(s)
312 *
313 * Each bit of this 64 x 32 bits array defines a CANID value:
314 *
315 * bit[i,j] = 1 implies that CANID=(i x 32)+j will be received, while
316 * bit[i,j] = 0 implies that CANID=(i x 32)+j will be discarded.
317 */
318static int pcan_usb_fd_set_filter_std(struct peak_usb_device *dev, int idx,
319 u32 mask)
320{
321 struct pucan_filter_std *cmd = pcan_usb_fd_cmd_buffer(dev);
322 int i, n;
323
324 /* select all rows when idx is out of range [0..63] */
325 if ((idx < 0) || (idx >= (1 << PUCAN_FLTSTD_ROW_IDX_BITS))) {
326 n = 1 << PUCAN_FLTSTD_ROW_IDX_BITS;
327 idx = 0;
328
329 /* select the row (and only the row) otherwise */
330 } else {
331 n = idx + 1;
332 }
333
334 for (i = idx; i < n; i++, cmd++) {
335 cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
336 PUCAN_CMD_FILTER_STD);
337 cmd->idx = cpu_to_le16(i);
338 cmd->mask = cpu_to_le32(mask);
339 }
340
341 /* send the command */
342 return pcan_usb_fd_send_cmd(dev, cmd);
343}
344
3ef5247e 345/* set/unset options
0a25e1f4 346 *
3ef5247e
SG		 347 * onoff set(1)/unset(0) options
348 * mask each bit defines a kind of options to set/unset
0a25e1f4 349 */
3ef5247e
SG		 350static int pcan_usb_fd_set_options(struct peak_usb_device *dev,
351 bool onoff, u16 ucan_mask, u16 usb_mask)
0a25e1f4 352{
3ef5247e 353 struct pcan_ufd_options *cmd = pcan_usb_fd_cmd_buffer(dev);
0a25e1f4
SG		 354
355 cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
3ef5247e
SG		 356 (onoff) ? PUCAN_CMD_SET_EN_OPTION :
357 PUCAN_CMD_CLR_DIS_OPTION);
0a25e1f4 358
3ef5247e 359 cmd->ucan_mask = cpu_to_le16(ucan_mask);
0a25e1f4
SG		 360 cmd->usb_mask = cpu_to_le16(usb_mask);
361
362 /* send the command */
363 return pcan_usb_fd_send_cmd(dev, ++cmd);
364}
365
366/* setup LED control */
367static int pcan_usb_fd_set_can_led(struct peak_usb_device *dev, u8 led_mode)
368{
369 struct pcan_ufd_led *cmd = pcan_usb_fd_cmd_buffer(dev);
370
371 cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
372 PCAN_UFD_CMD_LED_SET);
373 cmd->mode = led_mode;
374
375 /* send the command */
376 return pcan_usb_fd_send_cmd(dev, ++cmd);
377}
378
379/* set CAN clock domain */
380static int pcan_usb_fd_set_clock_domain(struct peak_usb_device *dev,
381 u8 clk_mode)
382{
383 struct pcan_ufd_clock *cmd = pcan_usb_fd_cmd_buffer(dev);
384
385 cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
386 PCAN_UFD_CMD_CLK_SET);
387 cmd->mode = clk_mode;
388
389 /* send the command */
390 return pcan_usb_fd_send_cmd(dev, ++cmd);
391}
392
393/* set bittiming for CAN and CAN-FD header */
394static int pcan_usb_fd_set_bittiming_slow(struct peak_usb_device *dev,
395 struct can_bittiming *bt)
396{
397 struct pucan_timing_slow *cmd = pcan_usb_fd_cmd_buffer(dev);
398
399 cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
400 PUCAN_CMD_TIMING_SLOW);
401 cmd->sjw_t = PUCAN_TSLOW_SJW_T(bt->sjw - 1,
402 dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES);
403
404 cmd->tseg2 = PUCAN_TSLOW_TSEG2(bt->phase_seg2 - 1);
405 cmd->tseg1 = PUCAN_TSLOW_TSEG1(bt->prop_seg + bt->phase_seg1 - 1);
406 cmd->brp = cpu_to_le16(PUCAN_TSLOW_BRP(bt->brp - 1));
407
408 cmd->ewl = 96; /* default */
409
410 /* send the command */
411 return pcan_usb_fd_send_cmd(dev, ++cmd);
412}
413
414/* set CAN-FD bittiming for data */
415static int pcan_usb_fd_set_bittiming_fast(struct peak_usb_device *dev,
416 struct can_bittiming *bt)
417{
418 struct pucan_timing_fast *cmd = pcan_usb_fd_cmd_buffer(dev);
419
420 cmd->opcode_channel = pucan_cmd_opcode_channel(dev,
421 PUCAN_CMD_TIMING_FAST);
422 cmd->sjw = PUCAN_TFAST_SJW(bt->sjw - 1);
423 cmd->tseg2 = PUCAN_TFAST_TSEG2(bt->phase_seg2 - 1);
424 cmd->tseg1 = PUCAN_TFAST_TSEG1(bt->prop_seg + bt->phase_seg1 - 1);
425 cmd->brp = cpu_to_le16(PUCAN_TFAST_BRP(bt->brp - 1));
426
427 /* send the command */
428 return pcan_usb_fd_send_cmd(dev, ++cmd);
429}
430
431/* handle restart but in asynchronously way
432 * (uses PCAN-USB Pro code to complete asynchronous request)
433 */
434static int pcan_usb_fd_restart_async(struct peak_usb_device *dev,
435 struct urb *urb, u8 *buf)
436{
437 u8 *pc = buf;
438
439 /* build the entire cmds list in the provided buffer, to go back into
440 * operational mode.
441 */
442 pc += pcan_usb_fd_build_restart_cmd(dev, pc);
443
444 /* add EOC */
445 memset(pc, 0xff, sizeof(struct pucan_command));
446 pc += sizeof(struct pucan_command);
447
448 /* complete the URB */
449 usb_fill_bulk_urb(urb, dev->udev,
450 usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT),
451 buf, pc - buf,
452 pcan_usb_pro_restart_complete, dev);
453
454 /* and submit it. */
455 return usb_submit_urb(urb, GFP_ATOMIC);
456}
457
458static int pcan_usb_fd_drv_loaded(struct peak_usb_device *dev, bool loaded)
459{
460 struct pcan_usb_fd_device *pdev =
461 container_of(dev, struct pcan_usb_fd_device, dev);
462
463 pdev->cmd_buffer_addr[0] = 0;
464 pdev->cmd_buffer_addr[1] = !!loaded;
465
466 return pcan_usb_pro_send_req(dev,
467 PCAN_USBPRO_REQ_FCT,
468 PCAN_USBPRO_FCT_DRVLD,
469 pdev->cmd_buffer_addr,
470 PCAN_USBPRO_FCT_DRVLD_REQ_LEN);
471}
472
473static int pcan_usb_fd_decode_canmsg(struct pcan_usb_fd_if *usb_if,
474 struct pucan_msg *rx_msg)
475{
476 struct pucan_rx_msg *rm = (struct pucan_rx_msg *)rx_msg;
477 struct peak_usb_device *dev = usb_if->dev[pucan_msg_get_channel(rm)];
478 struct net_device *netdev = dev->netdev;
479 struct canfd_frame *cfd;
480 struct sk_buff *skb;
481 const u16 rx_msg_flags = le16_to_cpu(rm->flags);
482
483 if (rx_msg_flags & PUCAN_MSG_EXT_DATA_LEN) {
484 /* CANFD frame case */
485 skb = alloc_canfd_skb(netdev, &cfd);
486 if (!skb)
487 return -ENOMEM;
488
489 if (rx_msg_flags & PUCAN_MSG_BITRATE_SWITCH)
490 cfd->flags |= CANFD_BRS;
491
492 if (rx_msg_flags & PUCAN_MSG_ERROR_STATE_IND)
493 cfd->flags |= CANFD_ESI;
494
495 cfd->len = can_dlc2len(get_canfd_dlc(pucan_msg_get_dlc(rm)));
496 } else {
497 /* CAN 2.0 frame case */
498 skb = alloc_can_skb(netdev, (struct can_frame **)&cfd);
499 if (!skb)
500 return -ENOMEM;
501
502 cfd->len = get_can_dlc(pucan_msg_get_dlc(rm));
503 }
504
505 cfd->can_id = le32_to_cpu(rm->can_id);
506
507 if (rx_msg_flags & PUCAN_MSG_EXT_ID)
508 cfd->can_id |= CAN_EFF_FLAG;
509
510 if (rx_msg_flags & PUCAN_MSG_RTR)
511 cfd->can_id |= CAN_RTR_FLAG;
512 else
513 memcpy(cfd->data, rm->d, cfd->len);
514
515 peak_usb_netif_rx(skb, &usb_if->time_ref,
516 le32_to_cpu(rm->ts_low), le32_to_cpu(rm->ts_high));
517
518 netdev->stats.rx_packets++;
519 netdev->stats.rx_bytes += cfd->len;
520
521 return 0;
522}
523
524/* handle uCAN status message */
525static int pcan_usb_fd_decode_status(struct pcan_usb_fd_if *usb_if,
526 struct pucan_msg *rx_msg)
527{
528 struct pucan_status_msg *sm = (struct pucan_status_msg *)rx_msg;
529 struct peak_usb_device *dev = usb_if->dev[pucan_stmsg_get_channel(sm)];
530 struct pcan_usb_fd_device *pdev =
531 container_of(dev, struct pcan_usb_fd_device, dev);
532 enum can_state new_state = CAN_STATE_ERROR_ACTIVE;
533 enum can_state rx_state, tx_state;
534 struct net_device *netdev = dev->netdev;
535 struct can_frame *cf;
536 struct sk_buff *skb;
537
538 /* nothing should be sent while in BUS_OFF state */
539 if (dev->can.state == CAN_STATE_BUS_OFF)
540 return 0;
541
542 if (sm->channel_p_w_b & PUCAN_BUS_BUSOFF) {
543 new_state = CAN_STATE_BUS_OFF;
544 } else if (sm->channel_p_w_b & PUCAN_BUS_PASSIVE) {
545 new_state = CAN_STATE_ERROR_PASSIVE;
546 } else if (sm->channel_p_w_b & PUCAN_BUS_WARNING) {
547 new_state = CAN_STATE_ERROR_WARNING;
548 } else {
549 /* no error bit (so, no error skb, back to active state) */
550 dev->can.state = CAN_STATE_ERROR_ACTIVE;
551 pdev->bec.txerr = 0;
552 pdev->bec.rxerr = 0;
553 return 0;
554 }
555
556 /* state hasn't changed */
557 if (new_state == dev->can.state)
558 return 0;
559
560 /* handle bus state change */
561 tx_state = (pdev->bec.txerr >= pdev->bec.rxerr) ? new_state : 0;
562 rx_state = (pdev->bec.txerr <= pdev->bec.rxerr) ? new_state : 0;
563
564 /* allocate an skb to store the error frame */
565 skb = alloc_can_err_skb(netdev, &cf);
566 if (skb)
567 can_change_state(netdev, cf, tx_state, rx_state);
568
569 /* things must be done even in case of OOM */
570 if (new_state == CAN_STATE_BUS_OFF)
571 can_bus_off(netdev);
572
573 if (!skb)
574 return -ENOMEM;
575
576 peak_usb_netif_rx(skb, &usb_if->time_ref,
577 le32_to_cpu(sm->ts_low), le32_to_cpu(sm->ts_high));
578
579 netdev->stats.rx_packets++;
580 netdev->stats.rx_bytes += cf->can_dlc;
581
582 return 0;
583}
584
585/* handle uCAN error message */
586static int pcan_usb_fd_decode_error(struct pcan_usb_fd_if *usb_if,
587 struct pucan_msg *rx_msg)
588{
589 struct pucan_error_msg *er = (struct pucan_error_msg *)rx_msg;
590 struct peak_usb_device *dev = usb_if->dev[pucan_ermsg_get_channel(er)];
591 struct pcan_usb_fd_device *pdev =
592 container_of(dev, struct pcan_usb_fd_device, dev);
593
594 /* keep a trace of tx and rx error counters for later use */
595 pdev->bec.txerr = er->tx_err_cnt;
596 pdev->bec.rxerr = er->rx_err_cnt;
597
598 return 0;
599}
600
601/* handle uCAN overrun message */
602static int pcan_usb_fd_decode_overrun(struct pcan_usb_fd_if *usb_if,
603 struct pucan_msg *rx_msg)
604{
605 struct pcan_ufd_ovr_msg *ov = (struct pcan_ufd_ovr_msg *)rx_msg;
606 struct peak_usb_device *dev = usb_if->dev[pufd_omsg_get_channel(ov)];
607 struct net_device *netdev = dev->netdev;
608 struct can_frame *cf;
609 struct sk_buff *skb;
610
611 /* allocate an skb to store the error frame */
612 skb = alloc_can_err_skb(netdev, &cf);
613 if (!skb)
614 return -ENOMEM;
615
616 cf->can_id |= CAN_ERR_CRTL;
617 cf->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
618
619 peak_usb_netif_rx(skb, &usb_if->time_ref,
620 le32_to_cpu(ov->ts_low), le32_to_cpu(ov->ts_high));
621
622 netdev->stats.rx_over_errors++;
623 netdev->stats.rx_errors++;
624
625 return 0;
626}
627
628/* handle USB calibration message */
629static void pcan_usb_fd_decode_ts(struct pcan_usb_fd_if *usb_if,
630 struct pucan_msg *rx_msg)
631{
632 struct pcan_ufd_ts_msg *ts = (struct pcan_ufd_ts_msg *)rx_msg;
633
634 /* should wait until clock is stabilized */
635 if (usb_if->cm_ignore_count > 0)
636 usb_if->cm_ignore_count--;
637 else
638 peak_usb_set_ts_now(&usb_if->time_ref, le32_to_cpu(ts->ts_low));
639}
640
641/* callback for bulk IN urb */
642static int pcan_usb_fd_decode_buf(struct peak_usb_device *dev, struct urb *urb)
643{
644 struct pcan_usb_fd_if *usb_if = pcan_usb_fd_dev_if(dev);
645 struct net_device *netdev = dev->netdev;
646 struct pucan_msg *rx_msg;
647 u8 *msg_ptr, *msg_end;
648 int err = 0;
649
650 /* loop reading all the records from the incoming message */
651 msg_ptr = urb->transfer_buffer;
652 msg_end = urb->transfer_buffer + urb->actual_length;
653 for (; msg_ptr < msg_end;) {
654 u16 rx_msg_type, rx_msg_size;
655
656 rx_msg = (struct pucan_msg *)msg_ptr;
657 if (!rx_msg->size) {
658 /* null packet found: end of list */
659 break;
660 }
661
662 rx_msg_size = le16_to_cpu(rx_msg->size);
663 rx_msg_type = le16_to_cpu(rx_msg->type);
664
665 /* check if the record goes out of current packet */
666 if (msg_ptr + rx_msg_size > msg_end) {
667 netdev_err(netdev,
668 "got frag rec: should inc usb rx buf sze\n");
669 err = -EBADMSG;
670 break;
671 }
672
673 switch (rx_msg_type) {
674 case PUCAN_MSG_CAN_RX:
675 err = pcan_usb_fd_decode_canmsg(usb_if, rx_msg);
676 if (err < 0)
677 goto fail;
678 break;
679
680 case PCAN_UFD_MSG_CALIBRATION:
681 pcan_usb_fd_decode_ts(usb_if, rx_msg);
682 break;
683
684 case PUCAN_MSG_ERROR:
685 err = pcan_usb_fd_decode_error(usb_if, rx_msg);
686 if (err < 0)
687 goto fail;
688 break;
689
690 case PUCAN_MSG_STATUS:
691 err = pcan_usb_fd_decode_status(usb_if, rx_msg);
692 if (err < 0)
693 goto fail;
694 break;
695
696 case PCAN_UFD_MSG_OVERRUN:
697 err = pcan_usb_fd_decode_overrun(usb_if, rx_msg);
698 if (err < 0)
699 goto fail;
700 break;
701
702 default:
703 netdev_err(netdev,
704 "unhandled msg type 0x%02x (%d): ignored\n",
705 rx_msg_type, rx_msg_type);
706 break;
707 }
708
709 msg_ptr += rx_msg_size;
710 }
711
712fail:
713 if (err)
714 pcan_dump_mem("received msg",
715 urb->transfer_buffer, urb->actual_length);
716 return err;
717}
718
719/* CAN/CANFD frames encoding callback */
720static int pcan_usb_fd_encode_msg(struct peak_usb_device *dev,
721 struct sk_buff *skb, u8 *obuf, size_t *size)
722{
723 struct pucan_tx_msg *tx_msg = (struct pucan_tx_msg *)obuf;
724 struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
725 u16 tx_msg_size, tx_msg_flags;
726 u8 can_dlc;
727
728 tx_msg_size = ALIGN(sizeof(struct pucan_tx_msg) + cfd->len, 4);
729 tx_msg->size = cpu_to_le16(tx_msg_size);
730 tx_msg->type = cpu_to_le16(PUCAN_MSG_CAN_TX);
731
732 tx_msg_flags = 0;
733 if (cfd->can_id & CAN_EFF_FLAG) {
734 tx_msg_flags |= PUCAN_MSG_EXT_ID;
735 tx_msg->can_id = cpu_to_le32(cfd->can_id & CAN_EFF_MASK);
736 } else {
737 tx_msg->can_id = cpu_to_le32(cfd->can_id & CAN_SFF_MASK);
738 }
739
740 if (can_is_canfd_skb(skb)) {
741 /* considering a CANFD frame */
742 can_dlc = can_len2dlc(cfd->len);
743
744 tx_msg_flags |= PUCAN_MSG_EXT_DATA_LEN;
745
746 if (cfd->flags & CANFD_BRS)
747 tx_msg_flags |= PUCAN_MSG_BITRATE_SWITCH;
748
749 if (cfd->flags & CANFD_ESI)
750 tx_msg_flags |= PUCAN_MSG_ERROR_STATE_IND;
751 } else {
752 /* CAND 2.0 frames */
753 can_dlc = cfd->len;
754
755 if (cfd->can_id & CAN_RTR_FLAG)
756 tx_msg_flags |= PUCAN_MSG_RTR;
757 }
758
759 tx_msg->flags = cpu_to_le16(tx_msg_flags);
760 tx_msg->channel_dlc = PUCAN_MSG_CHANNEL_DLC(dev->ctrl_idx, can_dlc);
761 memcpy(tx_msg->d, cfd->data, cfd->len);
762
763 /* add null size message to tag the end (messages are 32-bits aligned)
764 */
765 tx_msg = (struct pucan_tx_msg *)(obuf + tx_msg_size);
766
767 tx_msg->size = 0;
768
769 /* set the whole size of the USB packet to send */
770 *size = tx_msg_size + sizeof(u32);
771
772 return 0;
773}
774
775/* start the interface (last chance before set bus on) */
776static int pcan_usb_fd_start(struct peak_usb_device *dev)
777{
778 struct pcan_usb_fd_device *pdev =
779 container_of(dev, struct pcan_usb_fd_device, dev);
780 int err;
781
782 /* set filter mode: all acceptance */
783 err = pcan_usb_fd_set_filter_std(dev, -1, 0xffffffff);
784 if (err)
785 return err;
786
787 /* opening first device: */
788 if (pdev->usb_if->dev_opened_count == 0) {
789 /* reset time_ref */
790 peak_usb_init_time_ref(&pdev->usb_if->time_ref,
791 &pcan_usb_pro_fd);
792
793 /* enable USB calibration messages */
3ef5247e
SG		 794 err = pcan_usb_fd_set_options(dev, 1,
795 PUCAN_OPTION_ERROR,
796 PCAN_UFD_FLTEXT_CALIBRATION);
0a25e1f4
SG		 797 }
798
799 pdev->usb_if->dev_opened_count++;
800
801 /* reset cached error counters */
802 pdev->bec.txerr = 0;
803 pdev->bec.rxerr = 0;
804
805 return err;
806}
807
808/* socket callback used to copy berr counters values receieved through USB */
809static int pcan_usb_fd_get_berr_counter(const struct net_device *netdev,
810 struct can_berr_counter *bec)
811{
812 struct peak_usb_device *dev = netdev_priv(netdev);
813 struct pcan_usb_fd_device *pdev =
814 container_of(dev, struct pcan_usb_fd_device, dev);
815
816 *bec = pdev->bec;
817
818 /* must return 0 */
819 return 0;
820}
821
822/* stop interface (last chance before set bus off) */
823static int pcan_usb_fd_stop(struct peak_usb_device *dev)
824{
825 struct pcan_usb_fd_device *pdev =
826 container_of(dev, struct pcan_usb_fd_device, dev);
827
828 /* turn off special msgs for that interface if no other dev opened */
829 if (pdev->usb_if->dev_opened_count == 1)
3ef5247e
SG		 830 pcan_usb_fd_set_options(dev, 0,
831 PUCAN_OPTION_ERROR,
832 PCAN_UFD_FLTEXT_CALIBRATION);
0a25e1f4
SG		 833 pdev->usb_if->dev_opened_count--;
834
835 return 0;
836}
837
838/* called when probing, to initialize a device object */
839static int pcan_usb_fd_init(struct peak_usb_device *dev)
840{
841 struct pcan_usb_fd_device *pdev =
842 container_of(dev, struct pcan_usb_fd_device, dev);
843 int i, err = -ENOMEM;
844
845 /* do this for 1st channel only */
846 if (!dev->prev_siblings) {
847 /* allocate netdevices common structure attached to first one */
848 pdev->usb_if = kzalloc(sizeof(*pdev->usb_if), GFP_KERNEL);
849 if (!pdev->usb_if)
850 goto err_out;
851
852 /* allocate command buffer once for all for the interface */
853 pdev->cmd_buffer_addr = kmalloc(PCAN_UFD_CMD_BUFFER_SIZE,
854 GFP_KERNEL);
855 if (!pdev->cmd_buffer_addr)
856 goto err_out_1;
857
858 /* number of ts msgs to ignore before taking one into account */
859 pdev->usb_if->cm_ignore_count = 5;
860
861 err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO,
862 PCAN_USBPRO_INFO_FW,
863 &pdev->usb_if->fw_info,
864 sizeof(pdev->usb_if->fw_info));
865 if (err) {
866 dev_err(dev->netdev->dev.parent,
867 "unable to read %s firmware info (err %d)\n",
868 dev->adapter->name, err);
869 goto err_out_2;
870 }
871
872 /* explicit use of dev_xxx() instead of netdev_xxx() here:
873 * information displayed are related to the device itself, not
874 * to the canx (channel) device.
875 */
876 dev_info(dev->netdev->dev.parent,
877 "PEAK-System %s v%u fw v%u.%u.%u (%u channels)\n",
878 dev->adapter->name, pdev->usb_if->fw_info.hw_version,
879 pdev->usb_if->fw_info.fw_version[0],
880 pdev->usb_if->fw_info.fw_version[1],
881 pdev->usb_if->fw_info.fw_version[2],
882 dev->adapter->ctrl_count);
883
0f251e45
SG		 884 /* check for ability to switch between ISO/non-ISO modes */
885 if (pdev->usb_if->fw_info.fw_version[0] >= 2) {
886 /* firmware >= 2.x supports ISO/non-ISO switching */
887 dev->can.ctrlmode_supported |= CAN_CTRLMODE_FD_NON_ISO;
888 } else {
889 /* firmware < 2.x only supports fixed(!) non-ISO */
890 dev->can.ctrlmode |= CAN_CTRLMODE_FD_NON_ISO;
891 }
0a25e1f4
SG		 892
893 /* tell the hardware the can driver is running */
894 err = pcan_usb_fd_drv_loaded(dev, 1);
895 if (err) {
896 dev_err(dev->netdev->dev.parent,
897 "unable to tell %s driver is loaded (err %d)\n",
898 dev->adapter->name, err);
899 goto err_out_2;
900 }
901 } else {
902 /* otherwise, simply copy previous sibling's values */
903 struct pcan_usb_fd_device *ppdev =
904 container_of(dev->prev_siblings,
905 struct pcan_usb_fd_device, dev);
906
907 pdev->usb_if = ppdev->usb_if;
908 pdev->cmd_buffer_addr = ppdev->cmd_buffer_addr;
b0d4724b
SG		 909
910 /* do a copy of the ctrlmode[_supported] too */
911 dev->can.ctrlmode = ppdev->dev.can.ctrlmode;
912 dev->can.ctrlmode_supported = ppdev->dev.can.ctrlmode_supported;
0a25e1f4
SG		 913 }
914
915 pdev->usb_if->dev[dev->ctrl_idx] = dev;
916 dev->device_number =
917 le32_to_cpu(pdev->usb_if->fw_info.dev_id[dev->ctrl_idx]);
918
919 /* set clock domain */
920 for (i = 0; i < ARRAY_SIZE(pcan_usb_fd_clk_freq); i++)
921 if (dev->adapter->clock.freq == pcan_usb_fd_clk_freq[i])
922 break;
923
924 if (i >= ARRAY_SIZE(pcan_usb_fd_clk_freq)) {
925 dev_warn(dev->netdev->dev.parent,
926 "incompatible clock frequencies\n");
927 err = -EINVAL;
928 goto err_out_2;
929 }
930
931 pcan_usb_fd_set_clock_domain(dev, i);
932
933 /* set LED in default state (end of init phase) */
934 pcan_usb_fd_set_can_led(dev, PCAN_UFD_LED_DEF);
935
936 return 0;
937
938err_out_2:
939 kfree(pdev->cmd_buffer_addr);
940err_out_1:
941 kfree(pdev->usb_if);
942err_out:
943 return err;
944}
945
946/* called when driver module is being unloaded */
947static void pcan_usb_fd_exit(struct peak_usb_device *dev)
948{
949 struct pcan_usb_fd_device *pdev =
950 container_of(dev, struct pcan_usb_fd_device, dev);
951
952 /* when rmmod called before unplug and if down, should reset things
953 * before leaving
954 */
955 if (dev->can.state != CAN_STATE_STOPPED) {
956 /* set bus off on the corresponding channel */
957 pcan_usb_fd_set_bus(dev, 0);
958 }
959
960 /* switch off corresponding CAN LEDs */
961 pcan_usb_fd_set_can_led(dev, PCAN_UFD_LED_OFF);
962
963 /* if channel #0 (only) */
964 if (dev->ctrl_idx == 0) {
965 /* turn off calibration message if any device were opened */
966 if (pdev->usb_if->dev_opened_count > 0)
3ef5247e
SG		 967 pcan_usb_fd_set_options(dev, 0,
968 PUCAN_OPTION_ERROR,
969 PCAN_UFD_FLTEXT_CALIBRATION);
0a25e1f4
SG		 970
971 /* tell USB adapter that the driver is being unloaded */
972 pcan_usb_fd_drv_loaded(dev, 0);
973 }
974}
975
976/* called when the USB adapter is unplugged */
977static void pcan_usb_fd_free(struct peak_usb_device *dev)
978{
979 /* last device: can free shared objects now */
980 if (!dev->prev_siblings && !dev->next_siblings) {
981 struct pcan_usb_fd_device *pdev =
982 container_of(dev, struct pcan_usb_fd_device, dev);
983
984 /* free commands buffer */
985 kfree(pdev->cmd_buffer_addr);
986
987 /* free usb interface object */
988 kfree(pdev->usb_if);
989 }
990}
991
992/* describes the PCAN-USB FD adapter */
06b23f7f
MKB		 993static const struct can_bittiming_const pcan_usb_fd_const = {
994 .name = "pcan_usb_fd",
995 .tseg1_min = 1,
996 .tseg1_max = 64,
997 .tseg2_min = 1,
998 .tseg2_max = 16,
999 .sjw_max = 16,
1000 .brp_min = 1,
1001 .brp_max = 1024,
1002 .brp_inc = 1,
1003};
1004
1005static const struct can_bittiming_const pcan_usb_fd_data_const = {
1006 .name = "pcan_usb_fd",
1007 .tseg1_min = 1,
1008 .tseg1_max = 16,
1009 .tseg2_min = 1,
1010 .tseg2_max = 8,
1011 .sjw_max = 4,
1012 .brp_min = 1,
1013 .brp_max = 1024,
1014 .brp_inc = 1,
1015};
1016
0a25e1f4
SG		 1017const struct peak_usb_adapter pcan_usb_fd = {
1018 .name = "PCAN-USB FD",
1019 .device_id = PCAN_USBFD_PRODUCT_ID,
1020 .ctrl_count = PCAN_USBFD_CHANNEL_COUNT,
1021 .ctrlmode_supported = CAN_CTRLMODE_FD |
1022 CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
1023 .clock = {
1024 .freq = PCAN_UFD_CRYSTAL_HZ,
1025 },
06b23f7f
MKB		 1026 .bittiming_const = &pcan_usb_fd_const,
1027 .data_bittiming_const = &pcan_usb_fd_data_const,
0a25e1f4
SG		 1028
1029 /* size of device private data */
1030 .sizeof_dev_private = sizeof(struct pcan_usb_fd_device),
1031
1032 /* timestamps usage */
1033 .ts_used_bits = 32,
1034 .ts_period = 1000000, /* calibration period in ts. */
1035 .us_per_ts_scale = 1, /* us = (ts * scale) >> shift */
1036 .us_per_ts_shift = 0,
1037
1038 /* give here messages in/out endpoints */
1039 .ep_msg_in = PCAN_USBPRO_EP_MSGIN,
1040 .ep_msg_out = {PCAN_USBPRO_EP_MSGOUT_0},
1041
1042 /* size of rx/tx usb buffers */
1043 .rx_buffer_size = PCAN_UFD_RX_BUFFER_SIZE,
1044 .tx_buffer_size = PCAN_UFD_TX_BUFFER_SIZE,
1045
1046 /* device callbacks */
1047 .intf_probe = pcan_usb_pro_probe, /* same as PCAN-USB Pro */
1048 .dev_init = pcan_usb_fd_init,
1049
1050 .dev_exit = pcan_usb_fd_exit,
1051 .dev_free = pcan_usb_fd_free,
1052 .dev_set_bus = pcan_usb_fd_set_bus,
1053 .dev_set_bittiming = pcan_usb_fd_set_bittiming_slow,
1054 .dev_set_data_bittiming = pcan_usb_fd_set_bittiming_fast,
1055 .dev_decode_buf = pcan_usb_fd_decode_buf,
1056 .dev_start = pcan_usb_fd_start,
1057 .dev_stop = pcan_usb_fd_stop,
1058 .dev_restart_async = pcan_usb_fd_restart_async,
1059 .dev_encode_msg = pcan_usb_fd_encode_msg,
1060
1061 .do_get_berr_counter = pcan_usb_fd_get_berr_counter,
1062};
1063
1064/* describes the PCAN-USB Pro FD adapter */
06b23f7f
MKB		 1065static const struct can_bittiming_const pcan_usb_pro_fd_const = {
1066 .name = "pcan_usb_pro_fd",
1067 .tseg1_min = 1,
1068 .tseg1_max = 64,
1069 .tseg2_min = 1,
1070 .tseg2_max = 16,
1071 .sjw_max = 16,
1072 .brp_min = 1,
1073 .brp_max = 1024,
1074 .brp_inc = 1,
1075};
1076
1077static const struct can_bittiming_const pcan_usb_pro_fd_data_const = {
1078 .name = "pcan_usb_pro_fd",
1079 .tseg1_min = 1,
1080 .tseg1_max = 16,
1081 .tseg2_min = 1,
1082 .tseg2_max = 8,
1083 .sjw_max = 4,
1084 .brp_min = 1,
1085 .brp_max = 1024,
1086 .brp_inc = 1,
1087};
1088
0a25e1f4
SG		 1089const struct peak_usb_adapter pcan_usb_pro_fd = {
1090 .name = "PCAN-USB Pro FD",
1091 .device_id = PCAN_USBPROFD_PRODUCT_ID,
1092 .ctrl_count = PCAN_USBPROFD_CHANNEL_COUNT,
1093 .ctrlmode_supported = CAN_CTRLMODE_FD |
1094 CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
1095 .clock = {
1096 .freq = PCAN_UFD_CRYSTAL_HZ,
1097 },
06b23f7f
MKB		 1098 .bittiming_const = &pcan_usb_pro_fd_const,
1099 .data_bittiming_const = &pcan_usb_pro_fd_data_const,
0a25e1f4
SG		 1100
1101 /* size of device private data */
1102 .sizeof_dev_private = sizeof(struct pcan_usb_fd_device),
1103
1104 /* timestamps usage */
1105 .ts_used_bits = 32,
1106 .ts_period = 1000000, /* calibration period in ts. */
1107 .us_per_ts_scale = 1, /* us = (ts * scale) >> shift */
1108 .us_per_ts_shift = 0,
1109
1110 /* give here messages in/out endpoints */
1111 .ep_msg_in = PCAN_USBPRO_EP_MSGIN,
1112 .ep_msg_out = {PCAN_USBPRO_EP_MSGOUT_0, PCAN_USBPRO_EP_MSGOUT_1},
1113
1114 /* size of rx/tx usb buffers */
1115 .rx_buffer_size = PCAN_UFD_RX_BUFFER_SIZE,
1116 .tx_buffer_size = PCAN_UFD_TX_BUFFER_SIZE,
1117
1118 /* device callbacks */
1119 .intf_probe = pcan_usb_pro_probe, /* same as PCAN-USB Pro */
1120 .dev_init = pcan_usb_fd_init,
1121
1122 .dev_exit = pcan_usb_fd_exit,
1123 .dev_free = pcan_usb_fd_free,
1124 .dev_set_bus = pcan_usb_fd_set_bus,
1125 .dev_set_bittiming = pcan_usb_fd_set_bittiming_slow,
1126 .dev_set_data_bittiming = pcan_usb_fd_set_bittiming_fast,
1127 .dev_decode_buf = pcan_usb_fd_decode_buf,
1128 .dev_start = pcan_usb_fd_start,
1129 .dev_stop = pcan_usb_fd_stop,
1130 .dev_restart_async = pcan_usb_fd_restart_async,
1131 .dev_encode_msg = pcan_usb_fd_encode_msg,
1132
1133 .do_get_berr_counter = pcan_usb_fd_get_berr_counter,
1134};
Linux 6.x block layer and io_uring tree(s)