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mpsse: Add missing read buffer checks
[openocd.git] / src / jtag / drivers / mpsse.c
blobc5fd6d7fac1ab295e0686bfbbb83497c3a158e12
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 int retval;
90 };
91
92 /* Returns true if the string descriptor indexed by str_index in device matches string */
93 static bool string_descriptor_equal(libusb_device_handle *device, uint8_t str_index,
94 const char *string)
95 {
96 int retval;
97 char desc_string[256]; /* Max size of string descriptor */
98 retval = libusb_get_string_descriptor_ascii(device, str_index, (unsigned char *)desc_string,
99 sizeof(desc_string));
100 if (retval < 0) {
101 LOG_ERROR("libusb_get_string_descriptor_ascii() failed with %d", retval);
102 return false;
103 }
104 return strncmp(string, desc_string, sizeof(desc_string)) == 0;
105 }
106
107 /* Helper to open a libusb device that matches vid, pid, product string and/or serial string.
108 * Set any field to 0 as a wildcard. If the device is found true is returned, with ctx containing
109 * the already opened handle. ctx->interface must be set to the desired interface (channel) number
110 * prior to calling this function. */
111 static bool open_matching_device(struct mpsse_ctx *ctx, const uint16_t *vid, const uint16_t *pid,
112 const char *product, const char *serial)
113 {
114 libusb_device **list;
115 struct libusb_device_descriptor desc;
116 struct libusb_config_descriptor *config0;
117 int err;
118 bool found = false;
119 ssize_t cnt = libusb_get_device_list(ctx->usb_ctx, &list);
120 if (cnt < 0)
121 LOG_ERROR("libusb_get_device_list() failed with %zi", cnt);
122
123 for (ssize_t i = 0; i < cnt; i++) {
124 libusb_device *device = list[i];
125
126 err = libusb_get_device_descriptor(device, &desc);
127 if (err != LIBUSB_SUCCESS) {
128 LOG_ERROR("libusb_get_device_descriptor() failed with %d", err);
129 continue;
130 }
131
132 if (vid && *vid != desc.idVendor)
133 continue;
134 if (pid && *pid != desc.idProduct)
135 continue;
136
137 err = libusb_open(device, &ctx->usb_dev);
138 if (err != LIBUSB_SUCCESS) {
139 LOG_ERROR("libusb_open() failed with %s",
140 libusb_error_name(err));
141 continue;
142 }
143
144 if (product && !string_descriptor_equal(ctx->usb_dev, desc.iProduct, product)) {
145 libusb_close(ctx->usb_dev);
146 continue;
147 }
148
149 if (serial && !string_descriptor_equal(ctx->usb_dev, desc.iSerialNumber, serial)) {
150 libusb_close(ctx->usb_dev);
151 continue;
152 }
153
154 found = true;
155 break;
156 }
157
158 libusb_free_device_list(list, 1);
159
160 if (!found) {
161 LOG_ERROR("no device found");
162 return false;
163 }
164
165 err = libusb_get_config_descriptor(libusb_get_device(ctx->usb_dev), 0, &config0);
166 if (err != LIBUSB_SUCCESS) {
167 LOG_ERROR("libusb_get_config_descriptor() failed with %d", err);
168 libusb_close(ctx->usb_dev);
169 return false;
170 }
171
172 /* Make sure the first configuration is selected */
173 int cfg;
174 err = libusb_get_configuration(ctx->usb_dev, &cfg);
175 if (err != LIBUSB_SUCCESS) {
176 LOG_ERROR("libusb_get_configuration() failed with %d", err);
177 goto error;
178 }
179
180 if (desc.bNumConfigurations > 0 && cfg != config0->bConfigurationValue) {
181 err = libusb_set_configuration(ctx->usb_dev, config0->bConfigurationValue);
182 if (err != LIBUSB_SUCCESS) {
183 LOG_ERROR("libusb_set_configuration() failed with %d", err);
184 goto error;
185 }
186 }
187
188 /* Try to detach ftdi_sio kernel module */
189 err = libusb_detach_kernel_driver(ctx->usb_dev, ctx->interface);
190 if (err != LIBUSB_SUCCESS && err != LIBUSB_ERROR_NOT_FOUND
191 && err != LIBUSB_ERROR_NOT_SUPPORTED) {
192 LOG_ERROR("libusb_detach_kernel_driver() failed with %d", err);
193 goto error;
194 }
195
196 err = libusb_claim_interface(ctx->usb_dev, ctx->interface);
197 if (err != LIBUSB_SUCCESS) {
198 LOG_ERROR("libusb_claim_interface() failed with %d", err);
199 goto error;
200 }
201
202 /* Reset FTDI device */
203 err = libusb_control_transfer(ctx->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
204 SIO_RESET_REQUEST, SIO_RESET_SIO,
205 ctx->index, NULL, 0, ctx->usb_write_timeout);
206 if (err < 0) {
207 LOG_ERROR("failed to reset FTDI device: %d", err);
208 goto error;
209 }
210
211 switch (desc.bcdDevice) {
212 case 0x500:
213 ctx->type = TYPE_FT2232C;
214 break;
215 case 0x700:
216 ctx->type = TYPE_FT2232H;
217 break;
218 case 0x800:
219 ctx->type = TYPE_FT4232H;
220 break;
221 case 0x900:
222 ctx->type = TYPE_FT232H;
223 break;
224 default:
225 LOG_ERROR("unsupported FTDI chip type: 0x%04x", desc.bcdDevice);
226 goto error;
227 }
228
229 /* Determine maximum packet size and endpoint addresses */
230 if (!(desc.bNumConfigurations > 0 && ctx->interface < config0->bNumInterfaces
231 && config0->interface[ctx->interface].num_altsetting > 0))
232 goto desc_error;
233
234 const struct libusb_interface_descriptor *descriptor;
235 descriptor = &config0->interface[ctx->interface].altsetting[0];
236 if (descriptor->bNumEndpoints != 2)
237 goto desc_error;
238
239 ctx->in_ep = 0;
240 ctx->out_ep = 0;
241 for (int i = 0; i < descriptor->bNumEndpoints; i++) {
242 if (descriptor->endpoint[i].bEndpointAddress & 0x80) {
243 ctx->in_ep = descriptor->endpoint[i].bEndpointAddress;
244 ctx->max_packet_size =
245 descriptor->endpoint[i].wMaxPacketSize;
246 } else {
247 ctx->out_ep = descriptor->endpoint[i].bEndpointAddress;
248 }
249 }
250
251 if (ctx->in_ep == 0 || ctx->out_ep == 0)
252 goto desc_error;
253
254 libusb_free_config_descriptor(config0);
255 return true;
256
257 desc_error:
258 LOG_ERROR("unrecognized USB device descriptor");
259 error:
260 libusb_free_config_descriptor(config0);
261 libusb_close(ctx->usb_dev);
262 return false;
263 }
264
265 struct mpsse_ctx *mpsse_open(const uint16_t *vid, const uint16_t *pid, const char *description,
266 const char *serial, int channel)
267 {
268 struct mpsse_ctx *ctx = calloc(1, sizeof(*ctx));
269 int err;
270
271 if (!ctx)
272 return 0;
273
274 bit_copy_queue_init(&ctx->read_queue);
275 ctx->read_chunk_size = 16384;
276 ctx->read_size = 16384;
277 ctx->write_size = 16384;
278 ctx->read_chunk = malloc(ctx->read_chunk_size);
279 ctx->read_buffer = malloc(ctx->read_size);
280 ctx->write_buffer = malloc(ctx->write_size);
281 if (!ctx->read_chunk || !ctx->read_buffer || !ctx->write_buffer)
282 goto error;
283
284 ctx->interface = channel;
285 ctx->index = channel + 1;
286 ctx->usb_read_timeout = 5000;
287 ctx->usb_write_timeout = 5000;
288
289 err = libusb_init(&ctx->usb_ctx);
290 if (err != LIBUSB_SUCCESS) {
291 LOG_ERROR("libusb_init() failed with %d", err);
292 goto error;
293 }
294
295 if (!open_matching_device(ctx, vid, pid, description, serial)) {
296 /* Four hex digits plus terminating zero each */
297 char vidstr[5];
298 char pidstr[5];
299 LOG_ERROR("unable to open ftdi device with vid %s, pid %s, description '%s' and "
300 "serial '%s'",
301 vid ? sprintf(vidstr, "%04x", *vid), vidstr : "*",
302 pid ? sprintf(pidstr, "%04x", *pid), pidstr : "*",
303 description ? description : "*",
304 serial ? serial : "*");
305 ctx->usb_dev = 0;
306 goto error;
307 }
308
309 err = libusb_control_transfer(ctx->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
310 SIO_SET_LATENCY_TIMER_REQUEST, 255, ctx->index, NULL, 0,
311 ctx->usb_write_timeout);
312 if (err < 0) {
313 LOG_ERROR("unable to set latency timer: %d", err);
314 goto error;
315 }
316
317 err = libusb_control_transfer(ctx->usb_dev,
318 FTDI_DEVICE_OUT_REQTYPE,
319 SIO_SET_BITMODE_REQUEST,
320 0x0b | (BITMODE_MPSSE << 8),
321 ctx->index,
322 NULL,
323 0,
324 ctx->usb_write_timeout);
325 if (err < 0) {
326 LOG_ERROR("unable to set MPSSE bitmode: %d", err);
327 goto error;
328 }
329
330 mpsse_purge(ctx);
331
332 return ctx;
333 error:
334 mpsse_close(ctx);
335 return 0;
336 }
337
338 void mpsse_close(struct mpsse_ctx *ctx)
339 {
340 if (ctx->usb_dev)
341 libusb_close(ctx->usb_dev);
342 if (ctx->usb_ctx)
343 libusb_exit(ctx->usb_ctx);
344 bit_copy_discard(&ctx->read_queue);
345 if (ctx->write_buffer)
346 free(ctx->write_buffer);
347 if (ctx->read_buffer)
348 free(ctx->read_buffer);
349 if (ctx->read_chunk)
350 free(ctx->read_chunk);
351
352 free(ctx);
353 }
354
355 bool mpsse_is_high_speed(struct mpsse_ctx *ctx)
356 {
357 return ctx->type != TYPE_FT2232C;
358 }
359
360 void mpsse_purge(struct mpsse_ctx *ctx)
361 {
362 int err;
363 LOG_DEBUG("-");
364 ctx->write_count = 0;
365 ctx->read_count = 0;
366 ctx->retval = ERROR_OK;
367 bit_copy_discard(&ctx->read_queue);
368 err = libusb_control_transfer(ctx->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_RESET_REQUEST,
369 SIO_RESET_PURGE_RX, ctx->index, NULL, 0, ctx->usb_write_timeout);
370 if (err < 0) {
371 LOG_ERROR("unable to purge ftdi rx buffers: %d", err);
372 return;
373 }
374
375 err = libusb_control_transfer(ctx->usb_dev, FTDI_DEVICE_OUT_REQTYPE, SIO_RESET_REQUEST,
376 SIO_RESET_PURGE_TX, ctx->index, NULL, 0, ctx->usb_write_timeout);
377 if (err < 0) {
378 LOG_ERROR("unable to purge ftdi tx buffers: %d", err);
379 return;
380 }
381 }
382
383 static unsigned buffer_write_space(struct mpsse_ctx *ctx)
384 {
385 /* Reserve one byte for SEND_IMMEDIATE */
386 return ctx->write_size - ctx->write_count - 1;
387 }
388
389 static unsigned buffer_read_space(struct mpsse_ctx *ctx)
390 {
391 return ctx->read_size - ctx->read_count;
392 }
393
394 static void buffer_write_byte(struct mpsse_ctx *ctx, uint8_t data)
395 {
396 DEBUG_IO("%02x", data);
397 assert(ctx->write_count < ctx->write_size);
398 ctx->write_buffer[ctx->write_count++] = data;
399 }
400
401 static unsigned buffer_write(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset,
402 unsigned bit_count)
403 {
404 DEBUG_IO("%d bits", bit_count);
405 assert(ctx->write_count + DIV_ROUND_UP(bit_count, 8) <= ctx->write_size);
406 bit_copy(ctx->write_buffer + ctx->write_count, 0, out, out_offset, bit_count);
407 ctx->write_count += DIV_ROUND_UP(bit_count, 8);
408 return bit_count;
409 }
410
411 static unsigned buffer_add_read(struct mpsse_ctx *ctx, uint8_t *in, unsigned in_offset,
412 unsigned bit_count, unsigned offset)
413 {
414 DEBUG_IO("%d bits, offset %d", bit_count, offset);
415 assert(ctx->read_count + DIV_ROUND_UP(bit_count, 8) <= ctx->read_size);
416 bit_copy_queued(&ctx->read_queue, in, in_offset, ctx->read_buffer + ctx->read_count, offset,
417 bit_count);
418 ctx->read_count += DIV_ROUND_UP(bit_count, 8);
419 return bit_count;
420 }
421
422 void mpsse_clock_data_out(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset,
423 unsigned length, uint8_t mode)
424 {
425 mpsse_clock_data(ctx, out, out_offset, 0, 0, length, mode);
426 }
427
428 void mpsse_clock_data_in(struct mpsse_ctx *ctx, uint8_t *in, unsigned in_offset, unsigned length,
429 uint8_t mode)
430 {
431 mpsse_clock_data(ctx, 0, 0, in, in_offset, length, mode);
432 }
433
434 void mpsse_clock_data(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset, uint8_t *in,
435 unsigned in_offset, unsigned length, uint8_t mode)
436 {
437 /* TODO: Fix MSB first modes */
438 DEBUG_IO("%s%s %d bits", in ? "in" : "", out ? "out" : "", length);
439
440 if (ctx->retval != ERROR_OK) {
441 DEBUG_IO("Ignoring command due to previous error");
442 return;
443 }
444
445 /* TODO: On H chips, use command 0x8E/0x8F if in and out are both 0 */
446 if (out || (!out && !in))
447 mode |= 0x10;
448 if (in)
449 mode |= 0x20;
450
451 while (length > 0) {
452 /* Guarantee buffer space enough for a minimum size transfer */
453 if (buffer_write_space(ctx) + (length < 8) < (out || (!out && !in) ? 4 : 3)
454 || (in && buffer_read_space(ctx) < 1))
455 ctx->retval = mpsse_flush(ctx);
456
457 if (length < 8) {
458 /* Transfer remaining bits in bit mode */
459 buffer_write_byte(ctx, 0x02 | mode);
460 buffer_write_byte(ctx, length - 1);
461 if (out)
462 out_offset += buffer_write(ctx, out, out_offset, length);
463 if (in)
464 in_offset += buffer_add_read(ctx, in, in_offset, length, 8 - length);
465 if (!out && !in)
466 buffer_write_byte(ctx, 0x00);
467 length = 0;
468 } else {
469 /* Byte transfer */
470 unsigned this_bytes = length / 8;
471 /* MPSSE command limit */
472 if (this_bytes > 65536)
473 this_bytes = 65536;
474 /* Buffer space limit. We already made sure there's space for the minimum
475 * transfer. */
476 if ((out || (!out && !in)) && this_bytes + 3 > buffer_write_space(ctx))
477 this_bytes = buffer_write_space(ctx) - 3;
478 if (in && this_bytes > buffer_read_space(ctx))
479 this_bytes = buffer_read_space(ctx);
480
481 if (this_bytes > 0) {
482 buffer_write_byte(ctx, mode);
483 buffer_write_byte(ctx, (this_bytes - 1) & 0xff);
484 buffer_write_byte(ctx, (this_bytes - 1) >> 8);
485 if (out)
486 out_offset += buffer_write(ctx,
487 out,
488 out_offset,
489 this_bytes * 8);
490 if (in)
491 in_offset += buffer_add_read(ctx,
492 in,
493 in_offset,
494 this_bytes * 8,
495 0);
496 if (!out && !in)
497 for (unsigned n = 0; n < this_bytes; n++)
498 buffer_write_byte(ctx, 0x00);
499 length -= this_bytes * 8;
500 }
501 }
502 }
503 }
504
505 void mpsse_clock_tms_cs_out(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset,
506 unsigned length, bool tdi, uint8_t mode)
507 {
508 mpsse_clock_tms_cs(ctx, out, out_offset, 0, 0, length, tdi, mode);
509 }
510
511 void mpsse_clock_tms_cs(struct mpsse_ctx *ctx, const uint8_t *out, unsigned out_offset, uint8_t *in,
512 unsigned in_offset, unsigned length, bool tdi, uint8_t mode)
513 {
514 DEBUG_IO("%sout %d bits, tdi=%d", in ? "in" : "", length, tdi);
515 assert(out);
516
517 if (ctx->retval != ERROR_OK) {
518 DEBUG_IO("Ignoring command due to previous error");
519 return;
520 }
521
522 mode |= 0x42;
523 if (in)
524 mode |= 0x20;
525
526 while (length > 0) {
527 /* Guarantee buffer space enough for a minimum size transfer */
528 if (buffer_write_space(ctx) < 3 || (in && buffer_read_space(ctx) < 1))
529 ctx->retval = mpsse_flush(ctx);
530
531 /* Byte transfer */
532 unsigned this_bits = length;
533 /* MPSSE command limit */
534 /* NOTE: there's a report of an FT2232 bug in this area, where shifting
535 * exactly 7 bits can make problems with TMS signaling for the last
536 * clock cycle:
537 *
538 * http://developer.intra2net.com/mailarchive/html/libftdi/2009/msg00292.html
539 */
540 if (this_bits > 7)
541 this_bits = 7;
542
543 if (this_bits > 0) {
544 buffer_write_byte(ctx, mode);
545 buffer_write_byte(ctx, this_bits - 1);
546 uint8_t data = 0;
547 /* TODO: Fix MSB first, if allowed in MPSSE */
548 bit_copy(&data, 0, out, out_offset, this_bits);
549 out_offset += this_bits;
550 buffer_write_byte(ctx, data | (tdi ? 0x80 : 0x00));
551 if (in)
552 in_offset += buffer_add_read(ctx,
553 in,
554 in_offset,
555 this_bits,
556 8 - this_bits);
557 length -= this_bits;
558 }
559 }
560 }
561
562 void mpsse_set_data_bits_low_byte(struct mpsse_ctx *ctx, uint8_t data, uint8_t dir)
563 {
564 DEBUG_IO("-");
565
566 if (ctx->retval != ERROR_OK) {
567 DEBUG_IO("Ignoring command due to previous error");
568 return;
569 }
570
571 if (buffer_write_space(ctx) < 3)
572 ctx->retval = mpsse_flush(ctx);
573
574 buffer_write_byte(ctx, 0x80);
575 buffer_write_byte(ctx, data);
576 buffer_write_byte(ctx, dir);
577 }
578
579 void mpsse_set_data_bits_high_byte(struct mpsse_ctx *ctx, uint8_t data, uint8_t dir)
580 {
581 DEBUG_IO("-");
582
583 if (ctx->retval != ERROR_OK) {
584 DEBUG_IO("Ignoring command due to previous error");
585 return;
586 }
587
588 if (buffer_write_space(ctx) < 3)
589 ctx->retval = mpsse_flush(ctx);
590
591 buffer_write_byte(ctx, 0x82);
592 buffer_write_byte(ctx, data);
593 buffer_write_byte(ctx, dir);
594 }
595
596 void mpsse_read_data_bits_low_byte(struct mpsse_ctx *ctx, uint8_t *data)
597 {
598 DEBUG_IO("-");
599
600 if (ctx->retval != ERROR_OK) {
601 DEBUG_IO("Ignoring command due to previous error");
602 return;
603 }
604
605 if (buffer_write_space(ctx) < 1 || buffer_read_space(ctx) < 1)
606 ctx->retval = mpsse_flush(ctx);
607
608 buffer_write_byte(ctx, 0x81);
609 buffer_add_read(ctx, data, 0, 8, 0);
610 }
611
612 void mpsse_read_data_bits_high_byte(struct mpsse_ctx *ctx, uint8_t *data)
613 {
614 DEBUG_IO("-");
615
616 if (ctx->retval != ERROR_OK) {
617 DEBUG_IO("Ignoring command due to previous error");
618 return;
619 }
620
621 if (buffer_write_space(ctx) < 1 || buffer_read_space(ctx) < 1)
622 ctx->retval = mpsse_flush(ctx);
623
624 buffer_write_byte(ctx, 0x83);
625 buffer_add_read(ctx, data, 0, 8, 0);
626 }
627
628 static void single_byte_boolean_helper(struct mpsse_ctx *ctx, bool var, uint8_t val_if_true,
629 uint8_t val_if_false)
630 {
631 if (ctx->retval != ERROR_OK) {
632 DEBUG_IO("Ignoring command due to previous error");
633 return;
634 }
635
636 if (buffer_write_space(ctx) < 1)
637 ctx->retval = mpsse_flush(ctx);
638
639 buffer_write_byte(ctx, var ? val_if_true : val_if_false);
640 }
641
642 void mpsse_loopback_config(struct mpsse_ctx *ctx, bool enable)
643 {
644 LOG_DEBUG("%s", enable ? "on" : "off");
645 single_byte_boolean_helper(ctx, enable, 0x84, 0x85);
646 }
647
648 void mpsse_set_divisor(struct mpsse_ctx *ctx, uint16_t divisor)
649 {
650 LOG_DEBUG("%d", divisor);
651
652 if (ctx->retval != ERROR_OK) {
653 DEBUG_IO("Ignoring command due to previous error");
654 return;
655 }
656
657 if (buffer_write_space(ctx) < 3)
658 ctx->retval = mpsse_flush(ctx);
659
660 buffer_write_byte(ctx, 0x86);
661 buffer_write_byte(ctx, divisor & 0xff);
662 buffer_write_byte(ctx, divisor >> 8);
663 }
664
665 int mpsse_divide_by_5_config(struct mpsse_ctx *ctx, bool enable)
666 {
667 if (!mpsse_is_high_speed(ctx))
668 return ERROR_FAIL;
669
670 LOG_DEBUG("%s", enable ? "on" : "off");
671 single_byte_boolean_helper(ctx, enable, 0x8b, 0x8a);
672
673 return ERROR_OK;
674 }
675
676 int mpsse_rtck_config(struct mpsse_ctx *ctx, bool enable)
677 {
678 if (!mpsse_is_high_speed(ctx))
679 return ERROR_FAIL;
680
681 LOG_DEBUG("%s", enable ? "on" : "off");
682 single_byte_boolean_helper(ctx, enable, 0x96, 0x97);
683
684 return ERROR_OK;
685 }
686
687 int mpsse_set_frequency(struct mpsse_ctx *ctx, int frequency)
688 {
689 LOG_DEBUG("target %d Hz", frequency);
690 assert(frequency >= 0);
691 int base_clock;
692
693 if (frequency == 0)
694 return mpsse_rtck_config(ctx, true);
695
696 mpsse_rtck_config(ctx, false); /* just try */
697
698 if (frequency > 60000000 / 2 / 65536 && mpsse_divide_by_5_config(ctx, false) == ERROR_OK) {
699 base_clock = 60000000;
700 } else {
701 mpsse_divide_by_5_config(ctx, true); /* just try */
702 base_clock = 12000000;
703 }
704
705 int divisor = (base_clock / 2 + frequency - 1) / frequency - 1;
706 if (divisor > 65535)
707 divisor = 65535;
708 assert(divisor >= 0);
709
710 mpsse_set_divisor(ctx, divisor);
711
712 frequency = base_clock / 2 / (1 + divisor);
713 LOG_DEBUG("actually %d Hz", frequency);
714
715 return frequency;
716 }
717
718 /* Context needed by the callbacks */
719 struct transfer_result {
720 struct mpsse_ctx *ctx;
721 bool done;
722 unsigned transferred;
723 };
724
725 static LIBUSB_CALL void read_cb(struct libusb_transfer *transfer)
726 {
727 struct transfer_result *res = (struct transfer_result *)transfer->user_data;
728 struct mpsse_ctx *ctx = res->ctx;
729
730 unsigned packet_size = ctx->max_packet_size;
731
732 DEBUG_PRINT_BUF(transfer->buffer, transfer->actual_length);
733
734 /* Strip the two status bytes sent at the beginning of each USB packet
735 * while copying the chunk buffer to the read buffer */
736 unsigned num_packets = DIV_ROUND_UP(transfer->actual_length, packet_size);
737 unsigned chunk_remains = transfer->actual_length;
738 for (unsigned i = 0; i < num_packets && chunk_remains > 2; i++) {
739 unsigned this_size = packet_size - 2;
740 if (this_size > chunk_remains - 2)
741 this_size = chunk_remains - 2;
742 if (this_size > ctx->read_count - res->transferred)
743 this_size = ctx->read_count - res->transferred;
744 memcpy(ctx->read_buffer + res->transferred,
745 ctx->read_chunk + packet_size * i + 2,
746 this_size);
747 res->transferred += this_size;
748 chunk_remains -= this_size + 2;
749 if (res->transferred == ctx->read_count) {
750 res->done = true;
751 break;
752 }
753 }
754
755 DEBUG_IO("raw chunk %d, transferred %d of %d", transfer->actual_length, res->transferred,
756 ctx->read_count);
757
758 if (!res->done)
759 if (libusb_submit_transfer(transfer) != LIBUSB_SUCCESS)
760 res->done = true;
761 }
762
763 static LIBUSB_CALL void write_cb(struct libusb_transfer *transfer)
764 {
765 struct transfer_result *res = (struct transfer_result *)transfer->user_data;
766 struct mpsse_ctx *ctx = res->ctx;
767
768 res->transferred += transfer->actual_length;
769
770 DEBUG_IO("transferred %d of %d", res->transferred, ctx->write_count);
771
772 DEBUG_PRINT_BUF(transfer->buffer, transfer->actual_length);
773
774 if (res->transferred == ctx->write_count)
775 res->done = true;
776 else {
777 transfer->length = ctx->write_count - res->transferred;
778 transfer->buffer = ctx->write_buffer + res->transferred;
779 if (libusb_submit_transfer(transfer) != LIBUSB_SUCCESS)
780 res->done = true;
781 }
782 }
783
784 int mpsse_flush(struct mpsse_ctx *ctx)
785 {
786 int retval = ctx->retval;
787
788 if (retval != ERROR_OK) {
789 DEBUG_IO("Ignoring flush due to previous error");
790 assert(ctx->write_count == 0 && ctx->read_count == 0);
791 ctx->retval = ERROR_OK;
792 return retval;
793 }
794
795 DEBUG_IO("write %d%s, read %d", ctx->write_count, ctx->read_count ? "+1" : "",
796 ctx->read_count);
797 assert(ctx->write_count > 0 || ctx->read_count == 0); /* No read data without write data */
798
799 if (ctx->write_count == 0)
800 return retval;
801
802 struct libusb_transfer *read_transfer = 0;
803 struct transfer_result read_result = { .ctx = ctx, .done = true };
804 if (ctx->read_count) {
805 buffer_write_byte(ctx, 0x87); /* SEND_IMMEDIATE */
806 read_result.done = false;
807 /* delay read transaction to ensure the FTDI chip can support us with data
808 immediately after processing the MPSSE commands in the write transaction */
809 }
810
811 struct transfer_result write_result = { .ctx = ctx, .done = false };
812 struct libusb_transfer *write_transfer = libusb_alloc_transfer(0);
813 libusb_fill_bulk_transfer(write_transfer, ctx->usb_dev, ctx->out_ep, ctx->write_buffer,
814 ctx->write_count, write_cb, &write_result, ctx->usb_write_timeout);
815 retval = libusb_submit_transfer(write_transfer);
816
817 if (ctx->read_count) {
818 read_transfer = libusb_alloc_transfer(0);
819 libusb_fill_bulk_transfer(read_transfer, ctx->usb_dev, ctx->in_ep, ctx->read_chunk,
820 ctx->read_chunk_size, read_cb, &read_result,
821 ctx->usb_read_timeout);
822 retval = libusb_submit_transfer(read_transfer);
823 }
824
825 /* Polling loop, more or less taken from libftdi */
826 while (!write_result.done || !read_result.done) {
827 retval = libusb_handle_events(ctx->usb_ctx);
828 keep_alive();
829 if (retval != LIBUSB_SUCCESS && retval != LIBUSB_ERROR_INTERRUPTED) {
830 libusb_cancel_transfer(write_transfer);
831 if (read_transfer)
832 libusb_cancel_transfer(read_transfer);
833 while (!write_result.done || !read_result.done)
834 if (libusb_handle_events(ctx->usb_ctx) != LIBUSB_SUCCESS)
835 break;
836 }
837 }
838
839 if (retval != LIBUSB_SUCCESS) {
840 LOG_ERROR("libusb_handle_events() failed with %d", retval);
841 retval = ERROR_FAIL;
842 } else if (write_result.transferred < ctx->write_count) {
843 LOG_ERROR("ftdi device did not accept all data: %d, tried %d",
844 write_result.transferred,
845 ctx->write_count);
846 retval = ERROR_FAIL;
847 } else if (read_result.transferred < ctx->read_count) {
848 LOG_ERROR("ftdi device did not return all data: %d, expected %d",
849 read_result.transferred,
850 ctx->read_count);
851 retval = ERROR_FAIL;
852 } else if (ctx->read_count) {
853 ctx->write_count = 0;
854 ctx->read_count = 0;
855 bit_copy_execute(&ctx->read_queue);
856 retval = ERROR_OK;
857 } else {
858 ctx->write_count = 0;
859 bit_copy_discard(&ctx->read_queue);
860 retval = ERROR_OK;
861 }
862
863 libusb_free_transfer(write_transfer);
864 if (read_transfer)
865 libusb_free_transfer(read_transfer);
866
867 if (retval != ERROR_OK)
868 mpsse_purge(ctx);
869
870 return retval;
871 }
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