summaryrefslogtreecommitdiffstats
path: root/buspirate_spi.c
blob: 6d7fba7fd4ad084437defdd2aa3354ab1efc8571 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2009, 2010, 2011, 2012 Carl-Daniel Hailfinger
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <stdio.h>
#include <strings.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <unistd.h>
#include "flash.h"
#include "programmer.h"
#include "spi.h"

/* Change this to #define if you want to test without a serial implementation */
#undef FAKE_COMMUNICATION

struct buspirate_speeds {
	const char *name;
	const int speed;
};

#define BP_DEFAULTBAUD 115200

#ifndef FAKE_COMMUNICATION
static int buspirate_serialport_setup(char *dev)
{
	/* 115200bps, 8 databits, no parity, 1 stopbit */
	sp_fd = sp_openserport(dev, BP_DEFAULTBAUD);
	if (sp_fd == SER_INV_FD)
		return 1;
	return 0;
}
#else
#define buspirate_serialport_setup(...) 0
#define serialport_shutdown(...) 0
#define serialport_write(...) 0
#define serialport_read(...) 0
#define sp_flush_incoming(...) 0
#endif

struct bp_spi_data {
	unsigned char *commbuf;
	int commbufsize;
};

static int buspirate_commbuf_grow(int bufsize, unsigned char **bp_commbuf, int *bp_commbufsize)
{
	unsigned char *tmpbuf;

	/* Never shrink. realloc() calls are expensive. */
	if (bufsize <= *bp_commbufsize)
		return 0;

	tmpbuf = realloc(*bp_commbuf, bufsize);
	if (!tmpbuf) {
		/* Keep the existing buffer because memory is already tight. */
		msg_perr("Out of memory!\n");
		return ERROR_OOM;
	}

	*bp_commbuf = tmpbuf;
	*bp_commbufsize = bufsize;
	return 0;
}

static int buspirate_sendrecv(unsigned char *buf, unsigned int writecnt,
			      unsigned int readcnt)
{
	unsigned int i;
	int ret = 0;

	msg_pspew("%s: write %i, read %i ", __func__, writecnt, readcnt);
	if (!writecnt && !readcnt) {
		msg_perr("Zero length command!\n");
		return 1;
	}
	if (writecnt)
		msg_pspew("Sending");
	for (i = 0; i < writecnt; i++)
		msg_pspew(" 0x%02x", buf[i]);
#ifdef FAKE_COMMUNICATION
	/* Placate the caller for now. */
	if (readcnt) {
		buf[0] = 0x01;
		memset(buf + 1, 0xff, readcnt - 1);
	}
	ret = 0;
#else
	if (writecnt)
		ret = serialport_write(buf, writecnt);
	if (ret)
		return ret;
	if (readcnt)
		ret = serialport_read(buf, readcnt);
	if (ret)
		return ret;
#endif
	if (readcnt)
		msg_pspew(", receiving");
	for (i = 0; i < readcnt; i++)
		msg_pspew(" 0x%02x", buf[i]);
	msg_pspew("\n");
	return 0;
}

static int buspirate_wait_for_string(unsigned char *buf, const char *key)
{
	unsigned int keylen = strlen(key);
	int ret;

	ret = buspirate_sendrecv(buf, 0, keylen);
	while (!ret) {
		if (!memcmp(buf, key, keylen))
			return 0;
		memmove(buf, buf + 1, keylen - 1);
		ret = buspirate_sendrecv(buf + keylen - 1, 0, 1);
	}
	return ret;
}

static int buspirate_spi_shutdown(void *data)
{
	struct bp_spi_data *bp_data = data;
	unsigned char *const bp_commbuf = bp_data->commbuf;
	int ret = 0, ret2 = 0;
	/* No need to allocate a buffer here, we know that bp_commbuf is at least DEFAULT_BUFSIZE big. */

	/* Exit raw SPI mode (enter raw bitbang mode) */
	bp_commbuf[0] = 0x00;
	if ((ret = buspirate_sendrecv(bp_commbuf, 1, 0)))
		goto out_shutdown;
	if ((ret = buspirate_wait_for_string(bp_commbuf, "BBIO")))
		goto out_shutdown;
	if ((ret = buspirate_sendrecv(bp_commbuf, 0, 1)))
		goto out_shutdown;
	msg_pdbg("Raw bitbang mode version %c\n", bp_commbuf[0]);
	if (bp_commbuf[0] != '1') {
		msg_perr("Can't handle raw bitbang mode version %c!\n", bp_commbuf[0]);
		ret = 1;
		goto out_shutdown;
	}
	/* Reset Bus Pirate (return to user terminal) */
	bp_commbuf[0] = 0x0f;
	ret = buspirate_sendrecv(bp_commbuf, 1, 0);

out_shutdown:
	/* Shut down serial port communication */
	ret2 = serialport_shutdown(NULL);
	/* Keep the oldest error, it is probably the best indicator. */
	if (ret2 && !ret)
		ret = ret2;

	free(bp_commbuf);
	if (ret)
		msg_pdbg("Bus Pirate shutdown failed.\n");
	else
		msg_pdbg("Bus Pirate shutdown completed.\n");

	free(data);
	return ret;
}

static struct spi_master spi_master_buspirate = {
	.features	= SPI_MASTER_4BA,
	.max_data_read	= MAX_DATA_UNSPECIFIED,
	.max_data_write	= MAX_DATA_UNSPECIFIED,
	.command	= NULL,
	.multicommand	= default_spi_send_multicommand,
	.read		= default_spi_read,
	.write_256	= default_spi_write_256,
	.write_aai	= default_spi_write_aai,
	.shutdown	= buspirate_spi_shutdown,
};

static const struct buspirate_speeds spispeeds[] = {
	{"30k",		0x0},
	{"125k",	0x1},
	{"250k",	0x2},
	{"1M",		0x3},
	{"2M",		0x4},
	{"2.6M",	0x5},
	{"4M",		0x6},
	{"8M",		0x7},
	{NULL,		0x0}
};

static const struct buspirate_speeds serialspeeds[] = {
	{"115200",  115200},
	{"230400",  230400},
	{"250000",  250000},
	{"2000000", 2000000},
	{"2M",      2000000},
	{NULL,      0}
};

static int buspirate_spi_send_command_v1(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
					 const unsigned char *writearr, unsigned char *readarr)
{
	unsigned int i = 0;
	int ret = 0;
	struct bp_spi_data *bp_data = flash->mst->spi.data;

	if (writecnt > 16 || readcnt > 16 || (readcnt + writecnt) > 16)
		return SPI_INVALID_LENGTH;

	/* 3 bytes extra for CS#, len, CS#. */
	if (buspirate_commbuf_grow(writecnt + readcnt + 3, &bp_data->commbuf, &bp_data->commbufsize))
		return ERROR_OOM;

	unsigned char *const bp_commbuf = bp_data->commbuf;

	/* Assert CS# */
	bp_commbuf[i++] = 0x02;

	bp_commbuf[i++] = 0x10 | (writecnt + readcnt - 1);
	memcpy(bp_commbuf + i, writearr, writecnt);
	i += writecnt;
	memset(bp_commbuf + i, 0, readcnt);

	i += readcnt;
	/* De-assert CS# */
	bp_commbuf[i++] = 0x03;

	ret = buspirate_sendrecv(bp_commbuf, i, i);

	if (ret) {
		msg_perr("Bus Pirate communication error!\n");
		return SPI_GENERIC_ERROR;
	}

	if (bp_commbuf[0] != 0x01) {
		msg_perr("Protocol error while lowering CS#!\n");
		return SPI_GENERIC_ERROR;
	}

	if (bp_commbuf[1] != 0x01) {
		msg_perr("Protocol error while reading/writing SPI!\n");
		return SPI_GENERIC_ERROR;
	}

	if (bp_commbuf[i - 1] != 0x01) {
		msg_perr("Protocol error while raising CS#!\n");
		return SPI_GENERIC_ERROR;
	}

	/* Skip CS#, length, writearr. */
	memcpy(readarr, bp_commbuf + 2 + writecnt, readcnt);

	return ret;
}

static int buspirate_spi_send_command_v2(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
					 const unsigned char *writearr, unsigned char *readarr)
{
	int i = 0, ret = 0;
	struct bp_spi_data *bp_data = flash->mst->spi.data;

	if (writecnt > 4096 || readcnt > 4096 || (readcnt + writecnt) > 4096)
		return SPI_INVALID_LENGTH;

	/* 5 bytes extra for command, writelen, readlen.
	 * 1 byte extra for Ack/Nack.
	 */
	if (buspirate_commbuf_grow(max(writecnt + 5, readcnt + 1), &bp_data->commbuf, &bp_data->commbufsize))
		return ERROR_OOM;

	unsigned char *const bp_commbuf = bp_data->commbuf;

	/* Combined SPI write/read. */
	bp_commbuf[i++] = 0x04;
	bp_commbuf[i++] = (writecnt >> 8) & 0xff;
	bp_commbuf[i++] = writecnt & 0xff;
	bp_commbuf[i++] = (readcnt >> 8) & 0xff;
	bp_commbuf[i++] = readcnt & 0xff;
	memcpy(bp_commbuf + i, writearr, writecnt);

	ret = buspirate_sendrecv(bp_commbuf, i + writecnt, 1 + readcnt);

	if (ret) {
		msg_perr("Bus Pirate communication error!\n");
		return SPI_GENERIC_ERROR;
	}

	if (bp_commbuf[0] != 0x01) {
		msg_perr("Protocol error while sending SPI write/read!\n");
		return SPI_GENERIC_ERROR;
	}

	/* Skip Ack. */
	memcpy(readarr, bp_commbuf + 1, readcnt);

	return ret;
}

#define BP_FWVERSION(a,b)	((a) << 8 | (b))
#define BP_HWVERSION(a,b)	BP_FWVERSION(a,b)

/**
 * The Bus Pirate's PIC microcontroller supports custom baud rates by manually specifying a
 * clock divisor that can be calculated with the formula (16000000 / (4 * baud)) - 1.
 */
#define BP_DIVISOR(baud) ((4000000/(baud)) - 1)

static int buspirate_spi_init(void)
{
	char *tmp;
	char *dev;
	int i;
	int cnt;
	unsigned int fw_version_major = 0;
	unsigned int fw_version_minor = 0;
	unsigned int hw_version_major = 0;
	unsigned int hw_version_minor = 0;
	int spispeed = 0x7;
	int serialspeed_index = -1;
	int ret = 0;
	int pullup = 0;
	int psu = 0;
	unsigned char *bp_commbuf;
	int bp_commbufsize;

	dev = extract_programmer_param("dev");
	if (dev && !strlen(dev)) {
		free(dev);
		dev = NULL;
	}
	if (!dev) {
		msg_perr("No serial device given. Use flashrom -p buspirate_spi:dev=/dev/ttyUSB0\n");
		return 1;
	}

	tmp = extract_programmer_param("spispeed");
	if (tmp) {
		for (i = 0; spispeeds[i].name; i++) {
			if (!strncasecmp(spispeeds[i].name, tmp, strlen(spispeeds[i].name))) {
				spispeed = spispeeds[i].speed;
				break;
			}
		}
		if (!spispeeds[i].name)
			msg_perr("Invalid SPI speed, using default.\n");
	}
	free(tmp);

	/* Extract serialspeed parameter */
	tmp = extract_programmer_param("serialspeed");
	if (tmp) {
		for (i = 0; serialspeeds[i].name; i++) {
			if (!strncasecmp(serialspeeds[i].name, tmp, strlen(serialspeeds[i].name))) {
				serialspeed_index = i;
				break;
			}
		}
		if (!serialspeeds[i].name)
			msg_perr("Invalid serial speed %s, using default.\n", tmp);
	}
	free(tmp);

	tmp = extract_programmer_param("pullups");
	if (tmp) {
		if (strcasecmp("on", tmp) == 0)
			pullup = 1;
		else if (strcasecmp("off", tmp) == 0)
			; // ignore
		else
			msg_perr("Invalid pullups state, not using them.\n");
	}
	free(tmp);

	tmp = extract_programmer_param("psus");
	if (tmp) {
		if (strcasecmp("on", tmp) == 0)
			psu = 1;
		else if (strcasecmp("off", tmp) == 0)
			; // ignore
		else
			msg_perr("Invalid psus state, not enabling.\n");
	}
	free(tmp);

	/* Default buffer size is 19: 16 bytes data, 3 bytes control. */
#define DEFAULT_BUFSIZE (16 + 3)
	bp_commbuf = malloc(DEFAULT_BUFSIZE);
	if (!bp_commbuf) {
		msg_perr("Out of memory!\n");
		free(dev);
		return ERROR_OOM;
	}
	bp_commbufsize = DEFAULT_BUFSIZE;

	ret = buspirate_serialport_setup(dev);
	free(dev);
	if (ret) {
		free(bp_commbuf);
		return ret;
	}


	struct bp_spi_data *bp_data = calloc(1, sizeof(*bp_data));
	if (!bp_data) {
		msg_perr("Unable to allocate space for SPI master data\n");
		free(bp_commbuf);
		return 1;
	}
	bp_data->commbuf = bp_commbuf;
	bp_data->commbufsize = bp_commbufsize;

	/* This is the brute force version, but it should work.
	 * It is likely to fail if a previous flashrom run was aborted during a write with the new SPI commands
	 * in firmware v5.5 because that firmware may wait for up to 4096 bytes of input before responding to
	 * 0x00 again. The obvious workaround (sending 4096 bytes of \0) may cause significant startup delays.
	 */
	for (i = 0; i < 20; i++) {
		/* Enter raw bitbang mode */
		bp_commbuf[0] = 0x00;
		/* Send the command, don't read the response. */
		ret = buspirate_sendrecv(bp_commbuf, 1, 0);
		if (ret)
			goto init_err_cleanup_exit;
		/* The old way to handle responses from a Bus Pirate already in BBIO mode was to flush any
		 * response which came in over serial. Unfortunately that does not work reliably on Linux
		 * with FTDI USB-serial.
		 */
		//sp_flush_incoming();
		/* The Bus Pirate can't handle UART input buffer overflow in BBIO mode, and sending a sequence
		 * of 0x00 too fast apparently triggers such an UART input buffer overflow.
		 */
		internal_sleep(10000);
	}
	/* We know that 20 commands of \0 should elicit at least one BBIO1 response. */
	if ((ret = buspirate_wait_for_string(bp_commbuf, "BBIO")))
		goto init_err_cleanup_exit;

	/* Reset the Bus Pirate. */
	bp_commbuf[0] = 0x0f;
	/* Send the command, don't read the response. */
	if ((ret = buspirate_sendrecv(bp_commbuf, 1, 0)))
		goto init_err_cleanup_exit;
	if ((ret = buspirate_wait_for_string(bp_commbuf, "irate ")))
		goto init_err_cleanup_exit;
	/* Read the hardware version string. Last byte of the buffer is reserved for \0. */
	for (i = 0; i < DEFAULT_BUFSIZE - 1; i++) {
		if ((ret = buspirate_sendrecv(bp_commbuf + i, 0, 1)))
			goto init_err_cleanup_exit;
		if (strchr("\r\n\t ", bp_commbuf[i]))
			break;
	}
	bp_commbuf[i] = '\0';
	msg_pdbg("Detected Bus Pirate hardware ");
	if (bp_commbuf[0] != 'v')
		msg_pdbg("(unknown version number format)");
	else if (!strchr("0123456789", bp_commbuf[1]))
		msg_pdbg("(unknown version number format)");
	else {
		hw_version_major = strtoul((char *)bp_commbuf + 1, &tmp, 10);
		while ((*tmp != '\0') && !strchr("0123456789", *tmp))
			tmp++;
		hw_version_minor = strtoul(tmp, NULL, 10);
		msg_pdbg("%u.%u", hw_version_major, hw_version_minor);
	}
	msg_pdbg2(" (\"%s\")", bp_commbuf);
	msg_pdbg("\n");

	if ((ret = buspirate_wait_for_string(bp_commbuf, "irmware ")))
		goto init_err_cleanup_exit;
	/* Read the firmware version string. Last byte of the buffer is reserved for \0. */
	for (i = 0; i < DEFAULT_BUFSIZE - 1; i++) {
		if ((ret = buspirate_sendrecv(bp_commbuf + i, 0, 1)))
			goto init_err_cleanup_exit;
		if (strchr("\r\n\t ", bp_commbuf[i]))
			break;
	}
	bp_commbuf[i] = '\0';
	msg_pdbg("Detected Bus Pirate firmware ");
	if (bp_commbuf[0] != 'v')
		msg_pdbg("(unknown version number format)");
	else if (!strchr("0123456789", bp_commbuf[1]))
		msg_pdbg("(unknown version number format)");
	else {
		fw_version_major = strtoul((char *)bp_commbuf + 1, &tmp, 10);
		while ((*tmp != '\0') && !strchr("0123456789", *tmp))
			tmp++;
		fw_version_minor = strtoul(tmp, NULL, 10);
		msg_pdbg("%u.%u", fw_version_major, fw_version_minor);
	}
	msg_pdbg2(" (\"%s\")", bp_commbuf);
	msg_pdbg("\n");

	if ((ret = buspirate_wait_for_string(bp_commbuf, "HiZ>")))
		goto init_err_cleanup_exit;

	/* Tell the user about missing SPI binary mode in firmware 2.3 and older. */
	if (BP_FWVERSION(fw_version_major, fw_version_minor) < BP_FWVERSION(2, 4)) {
		msg_pinfo("Bus Pirate firmware 2.3 and older does not support binary SPI access.\n");
		msg_pinfo("Please upgrade to the latest firmware (at least 2.4).\n");
		ret = SPI_PROGRAMMER_ERROR;
		goto init_err_cleanup_exit;
	}

	/* Use fast SPI mode in firmware 5.5 and newer. */
	if (BP_FWVERSION(fw_version_major, fw_version_minor) >= BP_FWVERSION(5, 5)) {
		msg_pdbg("Using SPI command set v2.\n");
		/* Sensible default buffer size. */
		if (buspirate_commbuf_grow(260 + 5, &bp_commbuf, &bp_commbufsize)) {
			ret = ERROR_OOM;
			goto init_err_cleanup_exit;
		}
		bp_data->commbuf = bp_commbuf;
		bp_data->commbufsize = bp_commbufsize;
		spi_master_buspirate.max_data_read = 2048;
		spi_master_buspirate.max_data_write = 256;
		spi_master_buspirate.command = buspirate_spi_send_command_v2;
	} else {
		msg_pinfo("Bus Pirate firmware 5.4 and older does not support fast SPI access.\n");
		msg_pinfo("Reading/writing a flash chip may take hours.\n");
		msg_pinfo("It is recommended to upgrade to firmware 5.5 or newer.\n");
		/* Sensible default buffer size. */
		if (buspirate_commbuf_grow(16 + 3, &bp_commbuf, &bp_commbufsize)) {
			ret = ERROR_OOM;
			goto init_err_cleanup_exit;
		}
		bp_data->commbuf = bp_commbuf;
		bp_data->commbufsize = bp_commbufsize;
		spi_master_buspirate.max_data_read = 12;
		spi_master_buspirate.max_data_write = 12;
		spi_master_buspirate.command = buspirate_spi_send_command_v1;
	}

	/* Workaround for broken speed settings in firmware 6.1 and older. */
	if (BP_FWVERSION(fw_version_major, fw_version_minor) < BP_FWVERSION(6, 2))
		if (spispeed > 0x4) {
			msg_perr("Bus Pirate firmware 6.1 and older does not support SPI speeds above 2 MHz. "
				 "Limiting speed to 2 MHz.\n");
			msg_pinfo("It is recommended to upgrade to firmware 6.2 or newer.\n");
			spispeed = 0x4;
		}

	/* This works because speeds numbering starts at 0 and is contiguous. */
	msg_pdbg("SPI speed is %sHz\n", spispeeds[spispeed].name);

	/* Set 2M baud serial speed by default on hardware 3.0 and newer if a custom speed was not set */
	if (serialspeed_index == -1 && BP_HWVERSION(hw_version_major, hw_version_minor) >= BP_HWVERSION(3, 0)) {
		serialspeed_index = ARRAY_SIZE(serialspeeds) - 2;
		msg_pdbg("Bus Pirate v3 or newer detected. Set serial speed to 2M baud.\n");
	}

	/* Set custom serial speed if specified */
	if (serialspeed_index != -1) {
		if (BP_FWVERSION(fw_version_major, fw_version_minor) < BP_FWVERSION(5, 5)) {
			/* This feature requires firmware 5.5 or newer */
			msg_perr("Bus Pirate firmware 5.4 and older does not support custom serial speeds."
				 "Using default speed of 115200 baud.\n");
		} else if (serialspeeds[serialspeed_index].speed != BP_DEFAULTBAUD) {
			/* Set the serial speed to match the user's choice if it doesn't already */

			if (BP_HWVERSION(hw_version_major, hw_version_minor) < BP_HWVERSION(3, 0))
				msg_pwarn("Increased serial speeds may not work on older (<3.0) Bus Pirates."
					" Continue at your own risk.\n");

			/* Enter baud rate configuration mode */
			cnt = snprintf((char *)bp_commbuf, DEFAULT_BUFSIZE, "b\n");
			if ((ret = buspirate_sendrecv(bp_commbuf, cnt, 0)))
				goto init_err_cleanup_exit;
			if ((ret = buspirate_wait_for_string(bp_commbuf, ">")))
				goto init_err_cleanup_exit;

			/* Enter manual clock divisor entry mode */
			cnt = snprintf((char *)bp_commbuf, DEFAULT_BUFSIZE, "10\n");
			if ((ret = buspirate_sendrecv(bp_commbuf, cnt, 0)))
				goto init_err_cleanup_exit;
			if ((ret = buspirate_wait_for_string(bp_commbuf, ">")))
				goto init_err_cleanup_exit;

			/* Set the clock divisor to the value calculated from the user's input */
			cnt = snprintf((char *)bp_commbuf, DEFAULT_BUFSIZE, "%d\n",
				BP_DIVISOR(serialspeeds[serialspeed_index].speed));

			if ((ret = buspirate_sendrecv(bp_commbuf, cnt, 0)))
				goto init_err_cleanup_exit;
			sleep(1);

			/* Reconfigure the host's serial baud rate to the new value */
			if ((ret = serialport_config(sp_fd, serialspeeds[serialspeed_index].speed))) {
				msg_perr("Unable to configure system baud rate to specified value.");
				goto init_err_cleanup_exit;
			}

			/* Return to the main prompt */
			bp_commbuf[0] = ' ';
			if ((ret = buspirate_sendrecv(bp_commbuf, 1, 0)))
				goto init_err_cleanup_exit;
			if ((ret = buspirate_wait_for_string(bp_commbuf, "HiZ>")))
				goto init_err_cleanup_exit;

			msg_pdbg("Serial speed is %d baud\n", serialspeeds[serialspeed_index].speed);
		}

	}



	/* Enter raw bitbang mode */
	for (i = 0; i < 20; i++) {
		bp_commbuf[0] = 0x00;
		if ((ret = buspirate_sendrecv(bp_commbuf, 1, 0)))
			goto init_err_cleanup_exit;
	}
	if ((ret = buspirate_wait_for_string(bp_commbuf, "BBIO")))
		goto init_err_cleanup_exit;
	if ((ret = buspirate_sendrecv(bp_commbuf, 0, 1)))
		goto init_err_cleanup_exit;
	msg_pdbg("Raw bitbang mode version %c\n", bp_commbuf[0]);
	if (bp_commbuf[0] != '1') {
		msg_perr("Can't handle raw bitbang mode version %c!\n", bp_commbuf[0]);
		ret = 1;
		goto init_err_cleanup_exit;
	}
	/* Enter raw SPI mode */
	bp_commbuf[0] = 0x01;
	ret = buspirate_sendrecv(bp_commbuf, 1, 0);
	if (ret)
		goto init_err_cleanup_exit;
	if ((ret = buspirate_wait_for_string(bp_commbuf, "SPI")))
		goto init_err_cleanup_exit;
	if ((ret = buspirate_sendrecv(bp_commbuf, 0, 1)))
		goto init_err_cleanup_exit;
	msg_pdbg("Raw SPI mode version %c\n", bp_commbuf[0]);
	if (bp_commbuf[0] != '1') {
		msg_perr("Can't handle raw SPI mode version %c!\n", bp_commbuf[0]);
		ret = 1;
		goto init_err_cleanup_exit;
	}

	/* Initial setup (SPI peripherals config): Enable power, CS high, AUX */
	bp_commbuf[0] = 0x40 | 0x0b;
	if (pullup == 1) {
		bp_commbuf[0] |= (1 << 2);
		msg_pdbg("Enabling pull-up resistors.\n");
	}
	if (psu == 1) {
		bp_commbuf[0] |= (1 << 3);
		msg_pdbg("Enabling PSUs.\n");
	}
	ret = buspirate_sendrecv(bp_commbuf, 1, 1);
	if (ret)
		goto init_err_cleanup_exit;
	if (bp_commbuf[0] != 0x01) {
		msg_perr("Protocol error while setting power/CS/AUX(/Pull-up resistors)!\n");
		ret = 1;
		goto init_err_cleanup_exit;
	}

	/* Set SPI speed */
	bp_commbuf[0] = 0x60 | spispeed;
	ret = buspirate_sendrecv(bp_commbuf, 1, 1);
	if (ret)
		goto init_err_cleanup_exit;
	if (bp_commbuf[0] != 0x01) {
		msg_perr("Protocol error while setting SPI speed!\n");
		ret = 1;
		goto init_err_cleanup_exit;
	}

	/* Set SPI config: output type, idle, clock edge, sample */
	bp_commbuf[0] = 0x80 | 0xa;
	if (pullup == 1) {
		bp_commbuf[0] &= ~(1 << 3);
		msg_pdbg("Pull-ups enabled, so using HiZ pin output! (Open-Drain mode)\n");
	}
	ret = buspirate_sendrecv(bp_commbuf, 1, 1);
	if (ret)
		goto init_err_cleanup_exit;
	if (bp_commbuf[0] != 0x01) {
		msg_perr("Protocol error while setting SPI config!\n");
		ret = 1;
		goto init_err_cleanup_exit;
	}

	/* De-assert CS# */
	bp_commbuf[0] = 0x03;
	ret = buspirate_sendrecv(bp_commbuf, 1, 1);
	if (ret)
		goto init_err_cleanup_exit;
	if (bp_commbuf[0] != 0x01) {
		msg_perr("Protocol error while raising CS#!\n");
		ret = 1;
		goto init_err_cleanup_exit;
	}

	return register_spi_master(&spi_master_buspirate, bp_data);

init_err_cleanup_exit:
	buspirate_spi_shutdown(bp_data);
	return ret;
}

const struct programmer_entry programmer_buspirate_spi = {
	.name			= "buspirate_spi",
	.type			= OTHER,
				/* FIXME */
	.devs.note		= "Dangerous Prototypes Bus Pirate\n",
	.init			= buspirate_spi_init,
	.map_flash_region	= fallback_map,
	.unmap_flash_region	= fallback_unmap,
	.delay			= internal_delay,
};