Remove FSF address from GPL notices
[openocd.git] / src / jtag / drivers / arm-jtag-ew.c
1 /***************************************************************************
2 * Copyright (C) 2009 by Dimitar Dimitrov <dinuxbg@gmail.com> *
3 * based on Dominic Rath's and Benedikt Sauter's usbprog.c *
4 * *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
9 * *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
14 * *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program. If not, see <http://www.gnu.org/licenses/>. *
17 ***************************************************************************/
18
19 #ifdef HAVE_CONFIG_H
20 #include "config.h"
21 #endif
22
23 #include <jtag/interface.h>
24 #include <jtag/commands.h>
25 #include <usb.h>
26 #include "usb_common.h"
27
28 #define USB_VID 0x15ba
29 #define USB_PID 0x001e
30
31 #define ARMJTAGEW_EPT_BULK_OUT 0x01u
32 #define ARMJTAGEW_EPT_BULK_IN 0x82u
33
34 #define ARMJTAGEW_USB_TIMEOUT 2000
35
36 #define ARMJTAGEW_IN_BUFFER_SIZE (4*1024)
37 #define ARMJTAGEW_OUT_BUFFER_SIZE (4*1024)
38
39 /* USB command request codes. */
40 #define CMD_GET_VERSION 0x00
41 #define CMD_SELECT_DPIMPL 0x10
42 #define CMD_SET_TCK_FREQUENCY 0x11
43 #define CMD_GET_TCK_FREQUENCY 0x12
44 #define CMD_MEASURE_MAX_TCK_FREQ 0x15
45 #define CMD_MEASURE_RTCK_RESPONSE 0x16
46 #define CMD_TAP_SHIFT 0x17
47 #define CMD_SET_TAPHW_STATE 0x20
48 #define CMD_GET_TAPHW_STATE 0x21
49 #define CMD_TGPWR_SETUP 0x22
50
51 /* Global USB buffers */
52 static uint8_t usb_in_buffer[ARMJTAGEW_IN_BUFFER_SIZE];
53 static uint8_t usb_out_buffer[ARMJTAGEW_OUT_BUFFER_SIZE];
54
55 /* Queue command functions */
56 static void armjtagew_end_state(tap_state_t state);
57 static void armjtagew_state_move(void);
58 static void armjtagew_path_move(int num_states, tap_state_t *path);
59 static void armjtagew_runtest(int num_cycles);
60 static void armjtagew_scan(bool ir_scan,
61 enum scan_type type,
62 uint8_t *buffer,
63 int scan_size,
64 struct scan_command *command);
65 static void armjtagew_reset(int trst, int srst);
66 /* static void armjtagew_simple_command(uint8_t command); */
67 static int armjtagew_get_status(void);
68
69 /* tap buffer functions */
70 static void armjtagew_tap_init(void);
71 static int armjtagew_tap_execute(void);
72 static void armjtagew_tap_ensure_space(int scans, int bits);
73 static void armjtagew_tap_append_step(int tms, int tdi);
74 static void armjtagew_tap_append_scan(int length, uint8_t *buffer, struct scan_command *command);
75
76 /* ARM-JTAG-EW lowlevel functions */
77 struct armjtagew {
78 struct usb_dev_handle *usb_handle;
79 };
80
81 static struct armjtagew *armjtagew_usb_open(void);
82 static void armjtagew_usb_close(struct armjtagew *armjtagew);
83 static int armjtagew_usb_message(struct armjtagew *armjtagew, int out_length, int in_length);
84 static int armjtagew_usb_write(struct armjtagew *armjtagew, int out_length);
85 static int armjtagew_usb_read(struct armjtagew *armjtagew, int exp_in_length);
86
87 /* helper functions */
88 static int armjtagew_get_version_info(void);
89
90 #ifdef _DEBUG_USB_COMMS_
91 static void armjtagew_debug_buffer(uint8_t *buffer, int length);
92 #endif
93
94 static struct armjtagew *armjtagew_handle;
95
96 /**************************************************************************
97 * External interface implementation */
98
99 static int armjtagew_execute_queue(void)
100 {
101 struct jtag_command *cmd = jtag_command_queue;
102 int scan_size;
103 enum scan_type type;
104 uint8_t *buffer;
105
106 while (cmd != NULL) {
107 switch (cmd->type) {
108 case JTAG_RUNTEST:
109 DEBUG_JTAG_IO("runtest %i cycles, end in %i",
110 cmd->cmd.runtest->num_cycles, \
111 cmd->cmd.runtest->end_state);
112
113 armjtagew_end_state(cmd->cmd.runtest->end_state);
114 armjtagew_runtest(cmd->cmd.runtest->num_cycles);
115 break;
116
117 case JTAG_TLR_RESET:
118 DEBUG_JTAG_IO("statemove end in %i", cmd->cmd.statemove->end_state);
119
120 armjtagew_end_state(cmd->cmd.statemove->end_state);
121 armjtagew_state_move();
122 break;
123
124 case JTAG_PATHMOVE:
125 DEBUG_JTAG_IO("pathmove: %i states, end in %i", \
126 cmd->cmd.pathmove->num_states, \
127 cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]);
128
129 armjtagew_path_move(cmd->cmd.pathmove->num_states,
130 cmd->cmd.pathmove->path);
131 break;
132
133 case JTAG_SCAN:
134 DEBUG_JTAG_IO("scan end in %i", cmd->cmd.scan->end_state);
135
136 armjtagew_end_state(cmd->cmd.scan->end_state);
137
138 scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
139 DEBUG_JTAG_IO("scan input, length = %d", scan_size);
140
141 #ifdef _DEBUG_USB_COMMS_
142 armjtagew_debug_buffer(buffer, (scan_size + 7) / 8);
143 #endif
144 type = jtag_scan_type(cmd->cmd.scan);
145 armjtagew_scan(cmd->cmd.scan->ir_scan,
146 type, buffer,
147 scan_size, cmd->cmd.scan);
148 break;
149
150 case JTAG_RESET:
151 DEBUG_JTAG_IO("reset trst: %i srst %i",
152 cmd->cmd.reset->trst,
153 cmd->cmd.reset->srst);
154
155 armjtagew_tap_execute();
156
157 if (cmd->cmd.reset->trst == 1)
158 tap_set_state(TAP_RESET);
159 armjtagew_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
160 break;
161
162 case JTAG_SLEEP:
163 DEBUG_JTAG_IO("sleep %i", cmd->cmd.sleep->us);
164 armjtagew_tap_execute();
165 jtag_sleep(cmd->cmd.sleep->us);
166 break;
167
168 default:
169 LOG_ERROR("BUG: unknown JTAG command type encountered");
170 exit(-1);
171 }
172 cmd = cmd->next;
173 }
174
175 return armjtagew_tap_execute();
176 }
177
178 /* Sets speed in kHz. */
179 static int armjtagew_speed(int speed)
180 {
181 int result;
182 int speed_real;
183
184
185 usb_out_buffer[0] = CMD_SET_TCK_FREQUENCY;
186 buf_set_u32(usb_out_buffer + 1, 0, 32, speed*1000);
187
188 result = armjtagew_usb_message(armjtagew_handle, 5, 4);
189
190 if (result < 0) {
191 LOG_ERROR("ARM-JTAG-EW setting speed failed (%d)", result);
192 return ERROR_JTAG_DEVICE_ERROR;
193 }
194
195 usb_out_buffer[0] = CMD_GET_TCK_FREQUENCY;
196 result = armjtagew_usb_message(armjtagew_handle, 1, 4);
197 speed_real = (int)buf_get_u32(usb_in_buffer, 0, 32) / 1000;
198 if (result < 0) {
199 LOG_ERROR("ARM-JTAG-EW getting speed failed (%d)", result);
200 return ERROR_JTAG_DEVICE_ERROR;
201 } else
202 LOG_INFO("Requested speed %dkHz, emulator reported %dkHz.", speed, speed_real);
203
204 return ERROR_OK;
205 }
206
207 static int armjtagew_khz(int khz, int *jtag_speed)
208 {
209 *jtag_speed = khz;
210
211 return ERROR_OK;
212 }
213
214 static int armjtagew_speed_div(int speed, int *khz)
215 {
216 *khz = speed;
217
218 return ERROR_OK;
219 }
220
221 static int armjtagew_init(void)
222 {
223 int check_cnt;
224
225 armjtagew_handle = armjtagew_usb_open();
226
227 if (armjtagew_handle == 0) {
228 LOG_ERROR(
229 "Cannot find ARM-JTAG-EW Interface! Please check connection and permissions.");
230 return ERROR_JTAG_INIT_FAILED;
231 }
232
233 check_cnt = 0;
234 while (check_cnt < 3) {
235 if (armjtagew_get_version_info() == ERROR_OK) {
236 /* attempt to get status */
237 armjtagew_get_status();
238 break;
239 }
240
241 check_cnt++;
242 }
243
244 if (check_cnt == 3)
245 LOG_INFO("ARM-JTAG-EW initial read failed, don't worry");
246
247 /* Initial JTAG speed (for reset and initialization): 32 kHz */
248 armjtagew_speed(32);
249
250 LOG_INFO("ARM-JTAG-EW JTAG Interface ready");
251
252 armjtagew_reset(0, 0);
253 armjtagew_tap_init();
254
255 return ERROR_OK;
256 }
257
258 static int armjtagew_quit(void)
259 {
260 armjtagew_usb_close(armjtagew_handle);
261 return ERROR_OK;
262 }
263
264 /**************************************************************************
265 * Queue command implementations */
266
267 static void armjtagew_end_state(tap_state_t state)
268 {
269 if (tap_is_state_stable(state))
270 tap_set_end_state(state);
271 else {
272 LOG_ERROR("BUG: %i is not a valid end state", state);
273 exit(-1);
274 }
275 }
276
277 /* Goes to the end state. */
278 static void armjtagew_state_move(void)
279 {
280 int i;
281 int tms = 0;
282 uint8_t tms_scan = tap_get_tms_path(tap_get_state(), tap_get_end_state());
283 int tms_count = tap_get_tms_path_len(tap_get_state(), tap_get_end_state());
284
285 for (i = 0; i < tms_count; i++) {
286 tms = (tms_scan >> i) & 1;
287 armjtagew_tap_append_step(tms, 0);
288 }
289
290 tap_set_state(tap_get_end_state());
291 }
292
293 static void armjtagew_path_move(int num_states, tap_state_t *path)
294 {
295 int i;
296
297 for (i = 0; i < num_states; i++) {
298 /*
299 * TODO: The ARM-JTAG-EW hardware delays TDI with 3 TCK cycles when in RTCK mode.
300 * Either handle that here, or update the documentation with examples
301 * how to fix that in the configuration files.
302 */
303 if (path[i] == tap_state_transition(tap_get_state(), false))
304 armjtagew_tap_append_step(0, 0);
305 else if (path[i] == tap_state_transition(tap_get_state(), true))
306 armjtagew_tap_append_step(1, 0);
307 else {
308 LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition",
309 tap_state_name(tap_get_state()), tap_state_name(path[i]));
310 exit(-1);
311 }
312
313 tap_set_state(path[i]);
314 }
315
316 tap_set_end_state(tap_get_state());
317 }
318
319 static void armjtagew_runtest(int num_cycles)
320 {
321 int i;
322
323 tap_state_t saved_end_state = tap_get_end_state();
324
325 /* only do a state_move when we're not already in IDLE */
326 if (tap_get_state() != TAP_IDLE) {
327 armjtagew_end_state(TAP_IDLE);
328 armjtagew_state_move();
329 }
330
331 /* execute num_cycles */
332 for (i = 0; i < num_cycles; i++)
333 armjtagew_tap_append_step(0, 0);
334
335 /* finish in end_state */
336 armjtagew_end_state(saved_end_state);
337 if (tap_get_state() != tap_get_end_state())
338 armjtagew_state_move();
339 }
340
341 static void armjtagew_scan(bool ir_scan,
342 enum scan_type type,
343 uint8_t *buffer,
344 int scan_size,
345 struct scan_command *command)
346 {
347 tap_state_t saved_end_state;
348
349 armjtagew_tap_ensure_space(1, scan_size + 8);
350
351 saved_end_state = tap_get_end_state();
352
353 /* Move to appropriate scan state */
354 armjtagew_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
355
356 /* Only move if we're not already there */
357 if (tap_get_state() != tap_get_end_state())
358 armjtagew_state_move();
359
360 armjtagew_end_state(saved_end_state);
361
362 /* Scan */
363 armjtagew_tap_append_scan(scan_size, buffer, command);
364
365 /* We are in Exit1, go to Pause */
366 armjtagew_tap_append_step(0, 0);
367
368 tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
369
370 if (tap_get_state() != tap_get_end_state())
371 armjtagew_state_move();
372 }
373
374 static void armjtagew_reset(int trst, int srst)
375 {
376 const uint8_t trst_mask = (1u << 5);
377 const uint8_t srst_mask = (1u << 6);
378 uint8_t val = 0;
379 uint8_t outp_en = 0;
380 uint8_t change_mask = 0;
381 int result;
382
383 LOG_DEBUG("trst: %i, srst: %i", trst, srst);
384
385 if (srst == 0) {
386 val |= srst_mask;
387 outp_en &= ~srst_mask; /* tristate */
388 change_mask |= srst_mask;
389 } else if (srst == 1) {
390 val &= ~srst_mask;
391 outp_en |= srst_mask;
392 change_mask |= srst_mask;
393 }
394
395 if (trst == 0) {
396 val |= trst_mask;
397 outp_en &= ~trst_mask; /* tristate */
398 change_mask |= trst_mask;
399 } else if (trst == 1) {
400 val &= ~trst_mask;
401 outp_en |= trst_mask;
402 change_mask |= trst_mask;
403 }
404
405 usb_out_buffer[0] = CMD_SET_TAPHW_STATE;
406 usb_out_buffer[1] = val;
407 usb_out_buffer[2] = outp_en;
408 usb_out_buffer[3] = change_mask;
409 result = armjtagew_usb_write(armjtagew_handle, 4);
410 if (result != 4)
411 LOG_ERROR("ARM-JTAG-EW TRST/SRST pin set failed failed (%d)", result);
412 }
413
414 static int armjtagew_get_status(void)
415 {
416 int result;
417
418 usb_out_buffer[0] = CMD_GET_TAPHW_STATE;
419 result = armjtagew_usb_message(armjtagew_handle, 1, 12);
420
421 if (result == 0) {
422 unsigned int u_tg = buf_get_u32(usb_in_buffer, 0, 16);
423 LOG_INFO(
424 "U_tg = %d mV, U_aux = %d mV, U_tgpwr = %d mV, I_tgpwr = %d mA, D1 = %d, Target power %s %s",
425 (int)(buf_get_u32(usb_in_buffer + 0, 0, 16)),
426 (int)(buf_get_u32(usb_in_buffer + 2, 0, 16)),
427 (int)(buf_get_u32(usb_in_buffer + 4, 0, 16)),
428 (int)(buf_get_u32(usb_in_buffer + 6, 0, 16)),
429 usb_in_buffer[9],
430 usb_in_buffer[11] ? "OVERCURRENT" : "OK",
431 usb_in_buffer[10] ? "enabled" : "disabled");
432
433 if (u_tg < 1500)
434 LOG_ERROR("Vref too low. Check Target Power");
435 } else
436 LOG_ERROR("ARM-JTAG-EW command CMD_GET_TAPHW_STATE failed (%d)", result);
437
438 return ERROR_OK;
439 }
440
441 static int armjtagew_get_version_info(void)
442 {
443 int result;
444 char sn[16];
445 char auxinfo[257];
446
447 /* query hardware version */
448 usb_out_buffer[0] = CMD_GET_VERSION;
449 result = armjtagew_usb_message(armjtagew_handle, 1, 4 + 15 + 256);
450
451 if (result != 0) {
452 LOG_ERROR("ARM-JTAG-EW command CMD_GET_VERSION failed (%d)", result);
453 return ERROR_JTAG_DEVICE_ERROR;
454 }
455
456 memcpy(sn, usb_in_buffer + 4, 15);
457 sn[15] = '\0';
458 memcpy(auxinfo, usb_in_buffer + 4+15, 256);
459 auxinfo[256] = '\0';
460
461 LOG_INFO(
462 "ARM-JTAG-EW firmware version %d.%d, hardware revision %c, SN=%s, Additional info: %s", \
463 usb_in_buffer[1],
464 usb_in_buffer[0], \
465 isgraph(usb_in_buffer[2]) ? usb_in_buffer[2] : 'X', \
466 sn,
467 auxinfo);
468
469 if (1 != usb_in_buffer[1] || 6 != usb_in_buffer[0])
470 LOG_WARNING(
471 "ARM-JTAG-EW firmware version %d.%d is untested with this version of OpenOCD. You might experience unexpected behavior.",
472 usb_in_buffer[1],
473 usb_in_buffer[0]);
474 return ERROR_OK;
475 }
476
477 COMMAND_HANDLER(armjtagew_handle_armjtagew_info_command)
478 {
479 if (armjtagew_get_version_info() == ERROR_OK) {
480 /* attempt to get status */
481 armjtagew_get_status();
482 }
483
484 return ERROR_OK;
485 }
486
487 static const struct command_registration armjtagew_command_handlers[] = {
488 {
489 .name = "armjtagew_info",
490 .handler = &armjtagew_handle_armjtagew_info_command,
491 .mode = COMMAND_EXEC,
492 .help = "query armjtagew info",
493 },
494 COMMAND_REGISTRATION_DONE
495 };
496
497 struct jtag_interface armjtagew_interface = {
498 .name = "arm-jtag-ew",
499 .commands = armjtagew_command_handlers,
500 .transports = jtag_only,
501 .execute_queue = armjtagew_execute_queue,
502 .speed = armjtagew_speed,
503 .speed_div = armjtagew_speed_div,
504 .khz = armjtagew_khz,
505 .init = armjtagew_init,
506 .quit = armjtagew_quit,
507 };
508
509 /**************************************************************************
510 * ARM-JTAG-EW tap functions */
511
512 /* 2048 is the max value we can use here */
513 #define ARMJTAGEW_TAP_BUFFER_SIZE 2048
514
515 static int tap_length;
516 static uint8_t tms_buffer[ARMJTAGEW_TAP_BUFFER_SIZE];
517 static uint8_t tdi_buffer[ARMJTAGEW_TAP_BUFFER_SIZE];
518 static uint8_t tdo_buffer[ARMJTAGEW_TAP_BUFFER_SIZE];
519
520 struct pending_scan_result {
521 int first; /* First bit position in tdo_buffer to read */
522 int length; /* Number of bits to read */
523 struct scan_command *command; /* Corresponding scan command */
524 uint8_t *buffer;
525 };
526
527 #define MAX_PENDING_SCAN_RESULTS 256
528
529 static int pending_scan_results_length;
530 static struct pending_scan_result pending_scan_results_buffer[MAX_PENDING_SCAN_RESULTS];
531
532 static int last_tms;
533
534 static void armjtagew_tap_init(void)
535 {
536 tap_length = 0;
537 pending_scan_results_length = 0;
538 }
539
540 static void armjtagew_tap_ensure_space(int scans, int bits)
541 {
542 int available_scans = MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
543 int available_bits = ARMJTAGEW_TAP_BUFFER_SIZE * 8 - tap_length;
544
545 if (scans > available_scans || bits > available_bits)
546 armjtagew_tap_execute();
547 }
548
549 static void armjtagew_tap_append_step(int tms, int tdi)
550 {
551 last_tms = tms;
552 int index_local = tap_length / 8;
553
554 if (index_local < ARMJTAGEW_TAP_BUFFER_SIZE) {
555 int bit_index = tap_length % 8;
556 uint8_t bit = 1 << bit_index;
557
558 if (tms)
559 tms_buffer[index_local] |= bit;
560 else
561 tms_buffer[index_local] &= ~bit;
562
563 if (tdi)
564 tdi_buffer[index_local] |= bit;
565 else
566 tdi_buffer[index_local] &= ~bit;
567
568 tap_length++;
569 } else
570 LOG_ERROR("armjtagew_tap_append_step, overflow");
571 }
572
573 void armjtagew_tap_append_scan(int length, uint8_t *buffer, struct scan_command *command)
574 {
575 struct pending_scan_result *pending_scan_result =
576 &pending_scan_results_buffer[pending_scan_results_length];
577 int i;
578
579 pending_scan_result->first = tap_length;
580 pending_scan_result->length = length;
581 pending_scan_result->command = command;
582 pending_scan_result->buffer = buffer;
583
584 for (i = 0; i < length; i++)
585 armjtagew_tap_append_step((i < length-1 ? 0 : 1), (buffer[i/8] >> (i%8)) & 1);
586 pending_scan_results_length++;
587 }
588
589 /* Pad and send a tap sequence to the device, and receive the answer.
590 * For the purpose of padding we assume that we are in idle or pause state. */
591 static int armjtagew_tap_execute(void)
592 {
593 int byte_length;
594 int tms_offset;
595 int tdi_offset;
596 int i;
597 int result;
598
599 if (tap_length > 0) {
600 /* Pad last byte so that tap_length is divisible by 8 */
601 while (tap_length % 8 != 0) {
602 /* More of the last TMS value keeps us in the same state,
603 * analogous to free-running JTAG interfaces. */
604 armjtagew_tap_append_step(last_tms, 0);
605 }
606
607 byte_length = tap_length / 8;
608
609 usb_out_buffer[0] = CMD_TAP_SHIFT;
610 buf_set_u32(usb_out_buffer + 1, 0, 16, byte_length);
611
612 tms_offset = 3;
613 for (i = 0; i < byte_length; i++)
614 usb_out_buffer[tms_offset + i] = flip_u32(tms_buffer[i], 8);
615
616 tdi_offset = tms_offset + byte_length;
617 for (i = 0; i < byte_length; i++)
618 usb_out_buffer[tdi_offset + i] = flip_u32(tdi_buffer[i], 8);
619
620 result = armjtagew_usb_message(armjtagew_handle,
621 3 + 2 * byte_length,
622 byte_length + 4);
623
624 if (result == 0) {
625 int stat_local;
626
627 stat_local = (int)buf_get_u32(usb_in_buffer + byte_length, 0, 32);
628 if (stat_local) {
629 LOG_ERROR(
630 "armjtagew_tap_execute, emulator returned error code %d for a CMD_TAP_SHIFT command",
631 stat_local);
632 return ERROR_JTAG_QUEUE_FAILED;
633 }
634
635 for (i = 0; i < byte_length; i++)
636 tdo_buffer[i] = flip_u32(usb_in_buffer[i], 8);
637
638 for (i = 0; i < pending_scan_results_length; i++) {
639 struct pending_scan_result *pending_scan_result =
640 &pending_scan_results_buffer[i];
641 uint8_t *buffer = pending_scan_result->buffer;
642 int length = pending_scan_result->length;
643 int first = pending_scan_result->first;
644 struct scan_command *command = pending_scan_result->command;
645
646 /* Copy to buffer */
647 buf_set_buf(tdo_buffer, first, buffer, 0, length);
648
649 DEBUG_JTAG_IO("pending scan result, length = %d", length);
650
651 #ifdef _DEBUG_USB_COMMS_
652 armjtagew_debug_buffer(buffer, byte_length);
653 #endif
654
655 if (jtag_read_buffer(buffer, command) != ERROR_OK) {
656 armjtagew_tap_init();
657 return ERROR_JTAG_QUEUE_FAILED;
658 }
659
660 if (pending_scan_result->buffer != NULL)
661 free(pending_scan_result->buffer);
662 }
663 } else {
664 LOG_ERROR("armjtagew_tap_execute, wrong result %d, expected %d",
665 result,
666 byte_length);
667 return ERROR_JTAG_QUEUE_FAILED;
668 }
669
670 armjtagew_tap_init();
671 }
672
673 return ERROR_OK;
674 }
675
676 /****************************************************************************
677 * JLink USB low-level functions */
678
679 static struct armjtagew *armjtagew_usb_open()
680 {
681 usb_init();
682
683 const uint16_t vids[] = { USB_VID, 0 };
684 const uint16_t pids[] = { USB_PID, 0 };
685 struct usb_dev_handle *dev;
686 if (jtag_usb_open(vids, pids, &dev) != ERROR_OK)
687 return NULL;
688
689 struct armjtagew *result = malloc(sizeof(struct armjtagew));
690 result->usb_handle = dev;
691
692 #if 0
693 /* usb_set_configuration required under win32 */
694 usb_set_configuration(dev, dev->config[0].bConfigurationValue);
695 #endif
696 usb_claim_interface(dev, 0);
697 #if 0
698 /*
699 * This makes problems under Mac OS X. And is not needed
700 * under Windows. Hopefully this will not break a linux build
701 */
702 usb_set_altinterface(dev, 0);
703 #endif
704 return result;
705 }
706
707 static void armjtagew_usb_close(struct armjtagew *armjtagew)
708 {
709 usb_close(armjtagew->usb_handle);
710 free(armjtagew);
711 }
712
713 /* Send a message and receive the reply. */
714 static int armjtagew_usb_message(struct armjtagew *armjtagew, int out_length, int in_length)
715 {
716 int result;
717
718 result = armjtagew_usb_write(armjtagew, out_length);
719 if (result == out_length) {
720 result = armjtagew_usb_read(armjtagew, in_length);
721 if (result != in_length) {
722 LOG_ERROR("usb_bulk_read failed (requested=%d, result=%d)",
723 in_length,
724 result);
725 return -1;
726 }
727 } else {
728 LOG_ERROR("usb_bulk_write failed (requested=%d, result=%d)", out_length, result);
729 return -1;
730 }
731 return 0;
732 }
733
734 /* Write data from out_buffer to USB. */
735 static int armjtagew_usb_write(struct armjtagew *armjtagew, int out_length)
736 {
737 int result;
738
739 if (out_length > ARMJTAGEW_OUT_BUFFER_SIZE) {
740 LOG_ERROR("armjtagew_write illegal out_length=%d (max=%d)",
741 out_length,
742 ARMJTAGEW_OUT_BUFFER_SIZE);
743 return -1;
744 }
745
746 result = usb_bulk_write(armjtagew->usb_handle, ARMJTAGEW_EPT_BULK_OUT, \
747 (char *)usb_out_buffer, out_length, ARMJTAGEW_USB_TIMEOUT);
748
749 DEBUG_JTAG_IO("armjtagew_usb_write, out_length = %d, result = %d", out_length, result);
750
751 #ifdef _DEBUG_USB_COMMS_
752 armjtagew_debug_buffer(usb_out_buffer, out_length);
753 #endif
754 return result;
755 }
756
757 /* Read data from USB into in_buffer. */
758 static int armjtagew_usb_read(struct armjtagew *armjtagew, int exp_in_length)
759 {
760 int result = usb_bulk_read(armjtagew->usb_handle, ARMJTAGEW_EPT_BULK_IN, \
761 (char *)usb_in_buffer, exp_in_length, ARMJTAGEW_USB_TIMEOUT);
762
763 DEBUG_JTAG_IO("armjtagew_usb_read, result = %d", result);
764
765 #ifdef _DEBUG_USB_COMMS_
766 armjtagew_debug_buffer(usb_in_buffer, result);
767 #endif
768 return result;
769 }
770
771 #ifdef _DEBUG_USB_COMMS_
772 #define BYTES_PER_LINE 16
773
774 static void armjtagew_debug_buffer(uint8_t *buffer, int length)
775 {
776 char line[81];
777 char s[4];
778 int i;
779 int j;
780
781 for (i = 0; i < length; i += BYTES_PER_LINE) {
782 snprintf(line, 5, "%04x", i);
783 for (j = i; j < i + BYTES_PER_LINE && j < length; j++) {
784 snprintf(s, 4, " %02x", buffer[j]);
785 strcat(line, s);
786 }
787 LOG_DEBUG("%s", line);
788
789 /* Prevent GDB timeout (writing to log might take some time) */
790 keep_alive();
791 }
792 }
793 #endif