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libusb1_common, ftdi: clarify libusb_open error message
[openocd.git] / src / jtag / drivers / mpsse.c
blob82703bf341c73d53889f554bd6affea1abcd6668
1 /**************************************************************************
2 * Copyright (C) 2012 by Andreas Fritiofson *
3 * andreas.fritiofson@gmail.com *
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, write to the *
17 * Free Software Foundation, Inc., *
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
19 ***************************************************************************/
20
21 #ifdef HAVE_CONFIG_H
22 #include "config.h"
23 #endif
24
25 #include "mpsse.h"
26 #include "helper/log.h"
27 #include <libusb-1.0/libusb.h>
28
29 /* Compatibility define for older libusb-1.0 */
30 #ifndef LIBUSB_CALL
31 #define LIBUSB_CALL
32 #endif
33
34 #ifdef _DEBUG_JTAG_IO_
35 #define DEBUG_IO(expr...) LOG_DEBUG(expr)
36 #define DEBUG_PRINT_BUF(buf, len) \
37 do { \
38 char buf_string[32 * 3 + 1]; \
39 int buf_string_pos = 0; \
40 for (int i = 0; i < len; i++) { \
41 buf_string_pos += sprintf(buf_string + buf_string_pos, " %02x", buf[i]); \
42 if (i % 32 == 32 - 1) { \
43 LOG_DEBUG("%s", buf_string); \
44 buf_string_pos = 0; \
45 } \
46 } \
47 if (buf_string_pos > 0) \
48 LOG_DEBUG("%s", buf_string);\
49 } while (0)
50 #else
51 #define DEBUG_IO(expr...) do {} while (0)
52 #define DEBUG_PRINT_BUF(buf, len) do {} while (0)
53 #endif
54
55 #define FTDI_DEVICE_OUT_REQTYPE (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE)
56 #define FTDI_DEVICE_IN_REQTYPE (0x80 | LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE)
57
58 #define BITMODE_MPSSE 0x02
59
60 #define SIO_RESET_REQUEST 0x00
61 #define SIO_SET_LATENCY_TIMER_REQUEST 0x09
62 #define SIO_GET_LATENCY_TIMER_REQUEST 0x0A
63 #define SIO_SET_BITMODE_REQUEST 0x0B
64
65 #define SIO_RESET_SIO 0
66 #define SIO_RESET_PURGE_RX 1
67 #define SIO_RESET_PURGE_TX 2
68
69 struct mpsse_ctx {
70 libusb_context *usb_ctx;
71 libusb_device_handle *usb_dev;
72 unsigned int usb_write_timeout;
73 unsigned int usb_read_timeout;
74 uint8_t in_ep;
75 uint8_t out_ep;
76 uint16_t max_packet_size;
77 uint16_t index;
78 uint8_t interface;
79 enum ftdi_chip_type type;
80 uint8_t *write_buffer;
81 unsigned write_size;
82 unsigned write_count;
83 uint8_t *read_buffer;
84 unsigned read_size;
85 unsigned read_count;
86 uint8_t *read_chunk;
87 unsigned read_chunk_size;
88 struct bit_copy_queue read_queue;
89 };
90
91 /* Returns true if the string descriptor indexed by str_index in device matches string */
92 static bool string_descriptor_equal(libusb_device_handle *device, uint8_t str_index,
93 const char *string)
94 {
95 int retval;
96 char desc_string[256]; /* Max size of string descriptor */
97 retval = libusb_get_string_descriptor_ascii(device, str_index, (unsigned char *)desc_string,
98 sizeof(desc_string));
99 if (retval < 0) {
100 LOG_ERROR("libusb_get_string_descriptor_ascii() failed with %d", retval);
101 return false;
102 }
103 return strncmp(string, desc_string, sizeof(desc_string)) == 0;
104 }
105
106 /* Helper to open a libusb device that matches vid, pid, product string and/or serial string.
107 * Set any field to 0 as a wildcard. If the device is found true is returned, with ctx containing
108 * the already opened handle. ctx->interface must be set to the desired interface (channel) number
109 * prior to calling this function. */
110 static bool open_matching_device(struct mpsse_ctx *ctx, const uint16_t *vid, const uint16_t *pid,
111 const char *product, const char *serial)
112 {
113 libusb_device **list;
114 struct libusb_device_descriptor desc;
115 struct libusb_config_descriptor *config0;
116 int err;
117 bool found = false;
118 ssize_t cnt = libusb_get_device_list(ctx->usb_ctx, &list);
119 if (cnt < 0)
120 LOG_ERROR("libusb_get_device_list() failed with %zi", cnt);
121
122 for (ssize_t i = 0; i < cnt; i++) {
123 libusb_device *device = list[i];
124
125 err = libusb_get_device_descriptor(device, &desc);
126 if (err != LIBUSB_SUCCESS) {
127 LOG_ERROR("libusb_get_device_descriptor() failed with %d", err);
128 continue;
129 }
130
131 if (vid && *vid != desc.idVendor)
132 continue;
133 if (pid && *pid != desc.idProduct)
134 continue;
135
136 err = libusb_open(device, &ctx->usb_dev);
137 if (err != LIBUSB_SUCCESS) {
138 LOG_ERROR("libusb_open() failed with %s",
139 libusb_error_name(err));
140 continue;
141 }
142
143 if (product && !string_descriptor_equal(ctx->usb_dev, desc.iProduct, product)) {
144 libusb_close(ctx->usb_dev);
145 continue;
146 }
147
148 if (serial && !string_descriptor_equal(ctx->usb_dev, desc.iSerialNumber, serial)) {
149 libusb_close(ctx->usb_dev);
150 continue;
151 }
152
153 found = true;
154 break;
155 }
156
157 libusb_free_device_list(list, 1);
158
159 if (!found) {
160 LOG_ERROR("no device found");
161 return false;
162 }
163
164 err = libusb_get_config_descriptor(libusb_get_device(ctx->usb_dev), 0, &config0);
165 if (err != LIBUSB_SUCCESS) {
166 LOG_ERROR("libusb_get_config_descriptor() failed with %d", err);
167 libusb_close(ctx->usb_dev);
168 return false;
169 }
170
171 /* Make sure the first configuration is selected */
172 int cfg;
173 err = libusb_get_configuration(ctx->usb_dev, &cfg);
174 if (err != LIBUSB_SUCCESS) {
175 LOG_ERROR("libusb_get_configuration() failed with %d", err);
176 goto error;
177 }
178
179 if (desc.bNumConfigurations > 0 && cfg != config0->bConfigurationValue) {
180 err = libusb_set_configuration(ctx->usb_dev, config0->bConfigurationValue);
181 if (err != LIBUSB_SUCCESS) {
182 LOG_ERROR("libusb_set_configuration() failed with %d", err);
183 goto error;
184 }
185 }
186
187 /* Try to detach ftdi_sio kernel module */
188 err = libusb_detach_kernel_driver(ctx->usb_dev, ctx->interface);
189 if (err != LIBUSB_SUCCESS && err != LIBUSB_ERROR_NOT_FOUND
190 && err != LIBUSB_ERROR_NOT_SUPPORTED) {
191 LOG_ERROR("libusb_detach_kernel_driver() failed with %d", err);
192 goto error;
193 }
194
195 err = libusb_claim_interface(ctx->usb_dev, ctx->interface);
196 if (err != LIBUSB_SUCCESS) {
197 LOG_ERROR("libusb_claim_interface() failed with %d", err);
198 goto error;
199 }
200
201 /* Reset FTDI device */
202 err = libusb_control_transfer(ctx->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
203 SIO_RESET_REQUEST, SIO_RESET_SIO,
204 ctx->index, NULL, 0, ctx->usb_write_timeout);
205 if (err < 0) {
206 LOG_ERROR("failed to reset FTDI device: %d", err);
207 goto error;
208 }
209
210 switch (desc.bcdDevice) {
211 case 0x500:
212 ctx->type = TYPE_FT2232C;
213 break;
214 case 0x700:
215 ctx->type = TYPE_FT2232H;
216 break;
217 case 0x800:
218 ctx->type = TYPE_FT4232H;
219 break;
220 case 0x900:
221 ctx->type = TYPE_FT232H;
222 break;
223 default:
224 LOG_ERROR("unsupported FTDI chip type: 0x%04x", desc.bcdDevice);
225 goto error;
226 }
227
228 /* Determine maximum packet size and endpoint addresses */
229 if (!(desc.bNumConfigurations > 0 && ctx->interface < config0->bNumInterfaces
230 && config0->interface[ctx->interface].num_altsetting > 0))
231 goto desc_error;
232
233 const struct libusb_interface_descriptor *descriptor;
234 descriptor = &config0->interface[ctx->interface].altsetting[0];
235 if (descriptor->bNumEndpoints != 2)
236 goto desc_error;
237
238 ctx->in_ep = 0;
239 ctx->out_ep = 0;
240 for (int i = 0; i < descriptor->bNumEndpoints; i++) {
241 if (descriptor->endpoint[i].bEndpointAddress & 0x80) {
242 ctx->in_ep = descriptor->endpoint[i].bEndpointAddress;
243 ctx->max_packet_size =
244 descriptor->endpoint[i].wMaxPacketSize;
245 } else {
246 ctx->out_ep = descriptor->endpoint[i].bEndpointAddress;
247 }
248 }
249
250 if (ctx->in_ep == 0 || ctx->out_ep == 0)
251 goto desc_error;
252
253 libusb_free_config_descriptor(config0);
254 return true;
255
256 desc_error:
257 LOG_ERROR("unrecognized USB device descriptor");
258 error:
259 libusb_free_config_descriptor(config0);
260 libusb_close(ctx->usb_dev);
261 return false;
262 }
263
264 struct mpsse_ctx *mpsse_open(const uint16_t *vid, const uint16_t *pid, const char *description,
265 const char *serial, int channel)
266 {
267 struct mpsse_ctx *ctx = calloc(1, sizeof(*ctx));
268 int err;
269
270 if (!ctx)
271 return 0;
272
273 bit_copy_queue_init(&ctx->read_queue);
274 ctx->read_chunk_size = 16384;
275 ctx->read_size = 16384;
276 ctx->write_size = 16384;
277 ctx->read_chunk = malloc(ctx->read_chunk_size);
278 ctx->read_buffer = malloc(ctx->read_size);
279 ctx->write_buffer = malloc(ctx->write_size);
280 if (!ctx->read_chunk || !ctx->read_buffer || !ctx->write_buffer)
281 goto error;
282
283 ctx->interface = channel;
284 ctx->index = channel + 1;
285 ctx->usb_read_timeout = 5000;
286 ctx->usb_write_timeout = 5000;
287
288 err = libusb_init(&ctx->usb_ctx);
289 if (err != LIBUSB_SUCCESS) {
290 LOG_ERROR("libusb_init() failed with %d", err);
291 goto error;
292 }
293
294 if (!open_matching_device(ctx, vid, pid, description, serial)) {
295 /* Four hex digits plus terminating zero each */
296 char vidstr[5];
297 char pidstr[5];
298 LOG_ERROR("unable to open ftdi device with vid %s, pid %s, description '%s' and "
299 "serial '%s'",
300 vid ? sprintf(vidstr, "%04x", *vid), vidstr : "*",
301 pid ? sprintf(pidstr, "%04x", *pid), pidstr : "*",
302 description ? description : "*",
303 serial ? serial : "*");
304 ctx->usb_dev = 0;
305 goto error;
306 }
307
308 err = libusb_control_transfer(ctx->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
309 SIO_SET_LATENCY_TIMER_REQUEST, 255, ctx->index, NULL, 0,
310 ctx->usb_write_timeout);
311 if (err < 0) {
312 LOG_ERROR("unable to set latency timer: %d", err);
313 goto error;
314 }
315
316 err = libusb_control_transfer(ctx->usb_dev,
317 FTDI_DEVICE_OUT_REQTYPE,
318 SIO_SET_BITMODE_REQUEST,
319 0x0b | (BITMODE_MPSSE << 8),
320 ctx->index,
321 NULL,
322 0,
323 ctx->usb_write_timeout);
324 if (err < 0) {
325 LOG_ERROR("unable to set MPSSE bitmode: %d", err);
326 goto error;
327 }
328
329 mpsse_purge(ctx);
330
331 return ctx;
332 error:
333 mpsse_close(ctx);
334 return 0;
335 }
336
337 void mpsse_close(struct mpsse_ctx *ctx)
338 {
339 if (ctx->usb_dev)
340 libusb_close(ctx->usb_dev);
341 if (ctx->usb_ctx)
342 libusb_exit(ctx->usb_ctx);
343 bit_copy_discard(&ctx->read_queue);
344 if (ctx->write_buffer)
345 free(ctx->write_buffer);
346 if (ctx->read_buffer)
347 free(ctx->read_buffer);
348 if (ctx->read_chunk)
349 free(ctx->read_chunk);
350
351 free(ctx);
352 }
353
354 bool mpsse_is_high_speed(struct mpsse_ctx *ctx)
355 {
356 return ctx->type != TYPE_FT2232C;
357 }
358
359 void mpsse_purge(struct mpsse_ctx *ctx)
360 {
361 int err;
362 LOG_DEBUG("-");
363 ctx->write_count = 0;
364 ctx->read_count = 0;
365 bit_copy_discard(&ctx->read_queue);
366 err = libusb_control_transfer(ctx->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_RESET_REQUEST,
367 SIO_RESET_PURGE_RX, ctx->index, NULL, 0, ctx->usb_write_timeout);
368 if (err < 0) {
369 LOG_ERROR("unable to purge ftdi rx buffers: %d", err);
370 return;
371 }
372
373 err = libusb_control_transfer(ctx->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_RESET_REQUEST,
374 SIO_RESET_PURGE_TX, ctx->index, NULL, 0, ctx->usb_write_timeout);
375 if (err < 0) {
376 LOG_ERROR("unable to purge ftdi tx buffers: %d", err);
377 return;
378 }
379 }
380
381 static unsigned buffer_write_space(struct mpsse_ctx *ctx)
382 {
383 /* Reserve one byte for SEND_IMMEDIATE */
384 return ctx->write_size - ctx->write_count - 1;
385 }
386
387 static unsigned buffer_read_space(struct mpsse_ctx *ctx)
388 {
389 return ctx->read_size - ctx->read_count;
390 }
391
392 static void buffer_write_byte(struct mpsse_ctx *ctx, uint8_t data)
393 {
394 DEBUG_IO("%02x", data);
395 assert(ctx->write_count < ctx->write_size);
396 ctx->write_buffer[ctx->write_count++] = data;
397 }
398
399 static unsigned buffer_write(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset,
400 unsigned bit_count)
401 {
402 DEBUG_IO("%d bits", bit_count);
403 assert(ctx->write_count + DIV_ROUND_UP(bit_count, 8) <= ctx->write_size);
404 bit_copy(ctx->write_buffer + ctx->write_count, 0, out, out_offset, bit_count);
405 ctx->write_count += DIV_ROUND_UP(bit_count, 8);
406 return bit_count;
407 }
408
409 static unsigned buffer_add_read(struct mpsse_ctx *ctx, uint8_t *in, unsigned in_offset,
410 unsigned bit_count, unsigned offset)
411 {
412 DEBUG_IO("%d bits, offset %d", bit_count, offset);
413 assert(ctx->read_count + DIV_ROUND_UP(bit_count, 8) <= ctx->read_size);
414 bit_copy_queued(&ctx->read_queue, in, in_offset, ctx->read_buffer + ctx->read_count, offset,
415 bit_count);
416 ctx->read_count += DIV_ROUND_UP(bit_count, 8);
417 return bit_count;
418 }
419
420 int mpsse_clock_data_out(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset,
421 unsigned length, uint8_t mode)
422 {
423 return mpsse_clock_data(ctx, out, out_offset, 0, 0, length, mode);
424 }
425
426 int mpsse_clock_data_in(struct mpsse_ctx *ctx, uint8_t *in, unsigned in_offset, unsigned length,
427 uint8_t mode)
428 {
429 return mpsse_clock_data(ctx, 0, 0, in, in_offset, length, mode);
430 }
431
432 int mpsse_clock_data(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset, uint8_t *in,
433 unsigned in_offset, unsigned length, uint8_t mode)
434 {
435 /* TODO: Fix MSB first modes */
436 DEBUG_IO("%s%s %d bits", in ? "in" : "", out ? "out" : "", length);
437 int retval = ERROR_OK;
438
439 /* TODO: On H chips, use command 0x8E/0x8F if in and out are both 0 */
440 if (out || (!out && !in))
441 mode |= 0x10;
442 if (in)
443 mode |= 0x20;
444
445 while (length > 0) {
446 /* Guarantee buffer space enough for a minimum size transfer */
447 if (buffer_write_space(ctx) + (length < 8) < (out || (!out && !in) ? 4 : 3)
448 || (in && buffer_read_space(ctx) < 1))
449 retval = mpsse_flush(ctx);
450
451 if (length < 8) {
452 /* Transfer remaining bits in bit mode */
453 buffer_write_byte(ctx, 0x02 | mode);
454 buffer_write_byte(ctx, length - 1);
455 if (out)
456 out_offset += buffer_write(ctx, out, out_offset, length);
457 if (in)
458 in_offset += buffer_add_read(ctx, in, in_offset, length, 8 - length);
459 if (!out && !in)
460 buffer_write_byte(ctx, 0x00);
461 length = 0;
462 } else {
463 /* Byte transfer */
464 unsigned this_bytes = length / 8;
465 /* MPSSE command limit */
466 if (this_bytes > 65536)
467 this_bytes = 65536;
468 /* Buffer space limit. We already made sure there's space for the minimum
469 * transfer. */
470 if ((out || (!out && !in)) && this_bytes + 3 > buffer_write_space(ctx))
471 this_bytes = buffer_write_space(ctx) - 3;
472 if (in && this_bytes > buffer_read_space(ctx))
473 this_bytes = buffer_read_space(ctx);
474
475 if (this_bytes > 0) {
476 buffer_write_byte(ctx, mode);
477 buffer_write_byte(ctx, (this_bytes - 1) & 0xff);
478 buffer_write_byte(ctx, (this_bytes - 1) >> 8);
479 if (out)
480 out_offset += buffer_write(ctx,
481 out,
482 out_offset,
483 this_bytes * 8);
484 if (in)
485 in_offset += buffer_add_read(ctx,
486 in,
487 in_offset,
488 this_bytes * 8,
489 0);
490 if (!out && !in)
491 for (unsigned n = 0; n < this_bytes; n++)
492 buffer_write_byte(ctx, 0x00);
493 length -= this_bytes * 8;
494 }
495 }
496 }
497 return retval;
498 }
499
500 int mpsse_clock_tms_cs_out(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset,
501 unsigned length, bool tdi, uint8_t mode)
502 {
503 return mpsse_clock_tms_cs(ctx, out, out_offset, 0, 0, length, tdi, mode);
504 }
505
506 int mpsse_clock_tms_cs(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset, uint8_t *in,
507 unsigned in_offset, unsigned length, bool tdi, uint8_t mode)
508 {
509 DEBUG_IO("%sout %d bits, tdi=%d", in ? "in" : "", length, tdi);
510 assert(out);
511 int retval = ERROR_OK;
512
513 mode |= 0x42;
514 if (in)
515 mode |= 0x20;
516
517 while (length > 0) {
518 /* Guarantee buffer space enough for a minimum size transfer */
519 if (buffer_write_space(ctx) < 3 || (in && buffer_read_space(ctx) < 1))
520 retval = mpsse_flush(ctx);
521
522 /* Byte transfer */
523 unsigned this_bits = length;
524 /* MPSSE command limit */
525 /* NOTE: there's a report of an FT2232 bug in this area, where shifting
526 * exactly 7 bits can make problems with TMS signaling for the last
527 * clock cycle:
528 *
529 * http://developer.intra2net.com/mailarchive/html/libftdi/2009/msg00292.html
530 */
531 if (this_bits > 7)
532 this_bits = 7;
533
534 if (this_bits > 0) {
535 buffer_write_byte(ctx, mode);
536 buffer_write_byte(ctx, this_bits - 1);
537 uint8_t data = 0;
538 /* TODO: Fix MSB first, if allowed in MPSSE */
539 bit_copy(&data, 0, out, out_offset, this_bits);
540 out_offset += this_bits;
541 buffer_write_byte(ctx, data | (tdi ? 0x80 : 0x00));
542 if (in)
543 in_offset += buffer_add_read(ctx,
544 in,
545 in_offset,
546 this_bits,
547 8 - this_bits);
548 length -= this_bits;
549 }
550 }
551 return retval;
552 }
553
554 int mpsse_set_data_bits_low_byte(struct mpsse_ctx *ctx, uint8_t data, uint8_t dir)
555 {
556 DEBUG_IO("-");
557 int retval = ERROR_OK;
558
559 if (buffer_write_space(ctx) < 3)
560 retval = mpsse_flush(ctx);
561
562 buffer_write_byte(ctx, 0x80);
563 buffer_write_byte(ctx, data);
564 buffer_write_byte(ctx, dir);
565
566 return retval;
567 }
568
569 int mpsse_set_data_bits_high_byte(struct mpsse_ctx *ctx, uint8_t data, uint8_t dir)
570 {
571 DEBUG_IO("-");
572 int retval = ERROR_OK;
573
574 if (buffer_write_space(ctx) < 3)
575 retval = mpsse_flush(ctx);
576
577 buffer_write_byte(ctx, 0x82);
578 buffer_write_byte(ctx, data);
579 buffer_write_byte(ctx, dir);
580
581 return retval;
582 }
583
584 int mpsse_read_data_bits_low_byte(struct mpsse_ctx *ctx, uint8_t *data)
585 {
586 DEBUG_IO("-");
587 int retval = ERROR_OK;
588
589 if (buffer_write_space(ctx) < 1)
590 retval = mpsse_flush(ctx);
591
592 buffer_write_byte(ctx, 0x81);
593 buffer_add_read(ctx, data, 0, 8, 0);
594
595 return retval;
596 }
597
598 int mpsse_read_data_bits_high_byte(struct mpsse_ctx *ctx, uint8_t *data)
599 {
600 DEBUG_IO("-");
601 int retval = ERROR_OK;
602
603 if (buffer_write_space(ctx) < 1)
604 retval = mpsse_flush(ctx);
605
606 buffer_write_byte(ctx, 0x83);
607 buffer_add_read(ctx, data, 0, 8, 0);
608
609 return retval;
610 }
611
612 static int single_byte_boolean_helper(struct mpsse_ctx *ctx, bool var, uint8_t val_if_true,
613 uint8_t val_if_false)
614 {
615 int retval = ERROR_OK;
616
617 if (buffer_write_space(ctx) < 1)
618 retval = mpsse_flush(ctx);
619
620 buffer_write_byte(ctx, var ? val_if_true : val_if_false);
621
622 return retval;
623 }
624
625 int mpsse_loopback_config(struct mpsse_ctx *ctx, bool enable)
626 {
627 LOG_DEBUG("%s", enable ? "on" : "off");
628 return single_byte_boolean_helper(ctx, enable, 0x84, 0x85);
629 }
630
631 int mpsse_set_divisor(struct mpsse_ctx *ctx, uint16_t divisor)
632 {
633 LOG_DEBUG("%d", divisor);
634 int retval = ERROR_OK;
635
636 if (buffer_write_space(ctx) < 3)
637 retval = mpsse_flush(ctx);
638
639 buffer_write_byte(ctx, 0x86);
640 buffer_write_byte(ctx, divisor & 0xff);
641 buffer_write_byte(ctx, divisor >> 8);
642
643 return retval;
644 }
645
646 int mpsse_divide_by_5_config(struct mpsse_ctx *ctx, bool enable)
647 {
648 if (!mpsse_is_high_speed(ctx))
649 return ERROR_FAIL;
650
651 LOG_DEBUG("%s", enable ? "on" : "off");
652
653 return single_byte_boolean_helper(ctx, enable, 0x8b, 0x8a);
654 }
655
656 int mpsse_rtck_config(struct mpsse_ctx *ctx, bool enable)
657 {
658 if (!mpsse_is_high_speed(ctx))
659 return ERROR_FAIL;
660
661 LOG_DEBUG("%s", enable ? "on" : "off");
662
663 return single_byte_boolean_helper(ctx, enable, 0x96, 0x97);
664 }
665
666 int mpsse_set_frequency(struct mpsse_ctx *ctx, int frequency)
667 {
668 LOG_DEBUG("target %d Hz", frequency);
669 assert(frequency >= 0);
670 int base_clock;
671
672 if (frequency == 0)
673 return mpsse_rtck_config(ctx, true);
674
675 mpsse_rtck_config(ctx, false); /* just try */
676
677 if (frequency > 60000000 / 2 / 65536 && mpsse_is_high_speed(ctx)) {
678 int retval = mpsse_divide_by_5_config(ctx, false);
679 if (retval != ERROR_OK)
680 return retval;
681 base_clock = 60000000;
682 } else {
683 mpsse_divide_by_5_config(ctx, true); /* just try */
684 base_clock = 12000000;
685 }
686
687 int divisor = (base_clock / 2 + frequency - 1) / frequency - 1;
688 if (divisor > 65535)
689 divisor = 65535;
690 assert(divisor >= 0);
691
692 int retval = mpsse_set_divisor(ctx, divisor);
693 if (retval != ERROR_OK)
694 return retval;
695
696 frequency = base_clock / 2 / (1 + divisor);
697 LOG_DEBUG("actually %d Hz", frequency);
698
699 return frequency;
700 }
701
702 /* Context needed by the callbacks */
703 struct transfer_result {
704 struct mpsse_ctx *ctx;
705 bool done;
706 unsigned transferred;
707 };
708
709 static LIBUSB_CALL void read_cb(struct libusb_transfer *transfer)
710 {
711 struct transfer_result *res = (struct transfer_result *)transfer->user_data;
712 struct mpsse_ctx *ctx = res->ctx;
713
714 unsigned packet_size = ctx->max_packet_size;
715
716 DEBUG_PRINT_BUF(transfer->buffer, transfer->actual_length);
717
718 /* Strip the two status bytes sent at the beginning of each USB packet
719 * while copying the chunk buffer to the read buffer */
720 unsigned num_packets = DIV_ROUND_UP(transfer->actual_length, packet_size);
721 unsigned chunk_remains = transfer->actual_length;
722 for (unsigned i = 0; i < num_packets && chunk_remains > 2; i++) {
723 unsigned this_size = packet_size - 2;
724 if (this_size > chunk_remains - 2)
725 this_size = chunk_remains - 2;
726 if (this_size > ctx->read_count - res->transferred)
727 this_size = ctx->read_count - res->transferred;
728 memcpy(ctx->read_buffer + res->transferred,
729 ctx->read_chunk + packet_size * i + 2,
730 this_size);
731 res->transferred += this_size;
732 chunk_remains -= this_size + 2;
733 if (res->transferred == ctx->read_count) {
734 res->done = true;
735 break;
736 }
737 }
738
739 DEBUG_IO("raw chunk %d, transferred %d of %d", transfer->actual_length, res->transferred,
740 ctx->read_count);
741
742 if (!res->done)
743 if (libusb_submit_transfer(transfer) != LIBUSB_SUCCESS)
744 res->done = true;
745 }
746
747 static LIBUSB_CALL void write_cb(struct libusb_transfer *transfer)
748 {
749 struct transfer_result *res = (struct transfer_result *)transfer->user_data;
750 struct mpsse_ctx *ctx = res->ctx;
751
752 res->transferred += transfer->actual_length;
753
754 DEBUG_IO("transferred %d of %d", res->transferred, ctx->write_count);
755
756 DEBUG_PRINT_BUF(transfer->buffer, transfer->actual_length);
757
758 if (res->transferred == ctx->write_count)
759 res->done = true;
760 else {
761 transfer->length = ctx->write_count - res->transferred;
762 transfer->buffer = ctx->write_buffer + res->transferred;
763 if (libusb_submit_transfer(transfer) != LIBUSB_SUCCESS)
764 res->done = true;
765 }
766 }
767
768 int mpsse_flush(struct mpsse_ctx *ctx)
769 {
770 DEBUG_IO("write %d%s, read %d", ctx->write_count, ctx->read_count ? "+1" : "",
771 ctx->read_count);
772 assert(ctx->write_count > 0 || ctx->read_count == 0); /* No read data without write data */
773 int retval = ERROR_OK;
774
775 if (ctx->write_count == 0)
776 return retval;
777
778 struct libusb_transfer *read_transfer = 0;
779 struct transfer_result read_result = { .ctx = ctx, .done = true };
780 if (ctx->read_count) {
781 buffer_write_byte(ctx, 0x87); /* SEND_IMMEDIATE */
782 read_result.done = false;
783 /* delay read transaction to ensure the FTDI chip can support us with data
784 immediately after processing the MPSSE commands in the write transaction */
785 }
786
787 struct transfer_result write_result = { .ctx = ctx, .done = false };
788 struct libusb_transfer *write_transfer = libusb_alloc_transfer(0);
789 libusb_fill_bulk_transfer(write_transfer, ctx->usb_dev, ctx->out_ep, ctx->write_buffer,
790 ctx->write_count, write_cb, &write_result, ctx->usb_write_timeout);
791 retval = libusb_submit_transfer(write_transfer);
792
793 if (ctx->read_count) {
794 read_transfer = libusb_alloc_transfer(0);
795 libusb_fill_bulk_transfer(read_transfer, ctx->usb_dev, ctx->in_ep, ctx->read_chunk,
796 ctx->read_chunk_size, read_cb, &read_result,
797 ctx->usb_read_timeout);
798 retval = libusb_submit_transfer(read_transfer);
799 }
800
801 /* Polling loop, more or less taken from libftdi */
802 while (!write_result.done || !read_result.done) {
803 retval = libusb_handle_events(ctx->usb_ctx);
804 keep_alive();
805 if (retval != LIBUSB_SUCCESS && retval != LIBUSB_ERROR_INTERRUPTED) {
806 libusb_cancel_transfer(write_transfer);
807 if (read_transfer)
808 libusb_cancel_transfer(read_transfer);
809 while (!write_result.done || !read_result.done)
810 if (libusb_handle_events(ctx->usb_ctx) != LIBUSB_SUCCESS)
811 break;
812 }
813 }
814
815 if (retval != LIBUSB_SUCCESS) {
816 LOG_ERROR("libusb_handle_events() failed with %d", retval);
817 retval = ERROR_FAIL;
818 } else if (write_result.transferred < ctx->write_count) {
819 LOG_ERROR("ftdi device did not accept all data: %d, tried %d",
820 write_result.transferred,
821 ctx->write_count);
822 retval = ERROR_FAIL;
823 } else if (read_result.transferred < ctx->read_count) {
824 LOG_ERROR("ftdi device did not return all data: %d, expected %d",
825 read_result.transferred,
826 ctx->read_count);
827 retval = ERROR_FAIL;
828 } else if (ctx->read_count) {
829 ctx->write_count = 0;
830 ctx->read_count = 0;
831 bit_copy_execute(&ctx->read_queue);
832 retval = ERROR_OK;
833 } else {
834 ctx->write_count = 0;
835 bit_copy_discard(&ctx->read_queue);
836 retval = ERROR_OK;
837 }
838
839 libusb_free_transfer(write_transfer);
840 if (read_transfer)
841 libusb_free_transfer(read_transfer);
842
843 if (retval != ERROR_OK)
844 mpsse_purge(ctx);
845
846 return retval;
847 }
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