File: buspirate_spi.c

package info (click to toggle)
flashrom 0.9.2+r1141-2
  • links: PTS
  • area: main
  • in suites: squeeze
  • size: 1,536 kB
  • ctags: 1,827
  • sloc: ansic: 20,878; makefile: 322
file content (318 lines) | stat: -rw-r--r-- 7,526 bytes parent folder | download
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
/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2009, 2010 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "flash.h"
#include "chipdrivers.h"
#include "programmer.h"
#include "spi.h"

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

#ifndef FAKE_COMMUNICATION
static int buspirate_serialport_setup(char *dev)
{
	/* 115200bps, 8 databits, no parity, 1 stopbit */
	sp_fd = sp_openserport(dev, 115200);
	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

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

	msg_pspew("%s: write %i, read %i ", __func__, writecnt, readcnt);
	if (!writecnt && !readcnt) {
		msg_perr("Zero length command!\n");
		return 1;
	}
	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
	msg_pspew(", receiving");
	for (i = 0; i < readcnt; i++)
		msg_pspew(" 0x%02x", buf[i]);
	msg_pspew("\n");
	return 0;
}

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

int buspirate_spi_init(void)
{
	unsigned char buf[512];
	int ret = 0;
	int i;
	char *dev = NULL;
	char *speed = NULL;
	int spispeed = 0x7;

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

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

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

	ret = buspirate_serialport_setup(dev);
	if (ret)
		return ret;
	free(dev);

	/* This is the brute force version, but it should work. */
	for (i = 0; i < 19; i++) {
		/* Enter raw bitbang mode */
		buf[0] = 0x00;
		/* Send the command, don't read the response. */
		ret = buspirate_sendrecv(buf, 1, 0);
		if (ret)
			return ret;
		/* Read any response and discard it. */
		sp_flush_incoming();
	}
	/* Enter raw bitbang mode */
	buf[0] = 0x00;
	ret = buspirate_sendrecv(buf, 1, 5);
	if (ret)
		return ret;
	if (memcmp(buf, "BBIO", 4)) {
		msg_perr("Entering raw bitbang mode failed!\n");
		return 1;
	}
	msg_pdbg("Raw bitbang mode version %c\n", buf[4]);
	if (buf[4] != '1') {
		msg_perr("Can't handle raw bitbang mode version %c!\n",
			buf[4]);
		return 1;
	}
	/* Enter raw SPI mode */
	buf[0] = 0x01;
	ret = buspirate_sendrecv(buf, 1, 4);
	if (memcmp(buf, "SPI", 3)) {
		msg_perr("Entering raw SPI mode failed!\n");
		return 1;
	}
	msg_pdbg("Raw SPI mode version %c\n", buf[3]);
	if (buf[3] != '1') {
		msg_perr("Can't handle raw SPI mode version %c!\n",
			buf[3]);
		return 1;
	}

	/* Initial setup (SPI peripherals config): Enable power, CS high, AUX */
	buf[0] = 0x40 | 0xb;
	ret = buspirate_sendrecv(buf, 1, 1);
	if (ret)
		return 1;
	if (buf[0] != 0x01) {
		msg_perr("Protocol error while setting power/CS/AUX!\n");
		return 1;
	}

	/* Set SPI speed */
	buf[0] = 0x60 | spispeed;
	ret = buspirate_sendrecv(buf, 1, 1);
	if (ret)
		return 1;
	if (buf[0] != 0x01) {
		msg_perr("Protocol error while setting SPI speed!\n");
		return 1;
	}
	
	/* Set SPI config: output type, idle, clock edge, sample */
	buf[0] = 0x80 | 0xa;
	ret = buspirate_sendrecv(buf, 1, 1);
	if (ret)
		return 1;
	if (buf[0] != 0x01) {
		msg_perr("Protocol error while setting SPI config!\n");
		return 1;
	}

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

	buses_supported = CHIP_BUSTYPE_SPI;
	spi_controller = SPI_CONTROLLER_BUSPIRATE;

	return 0;
}

int buspirate_spi_shutdown(void)
{
	unsigned char buf[5];
	int ret = 0;

	/* Exit raw SPI mode (enter raw bitbang mode) */
	buf[0] = 0x00;
	ret = buspirate_sendrecv(buf, 1, 5);
	if (ret)
		return ret;
	if (memcmp(buf, "BBIO", 4)) {
		msg_perr("Entering raw bitbang mode failed!\n");
		return 1;
	}
	msg_pdbg("Raw bitbang mode version %c\n", buf[4]);
	if (buf[4] != '1') {
		msg_perr("Can't handle raw bitbang mode version %c!\n",
			buf[4]);
		return 1;
	}
	/* Reset Bus Pirate (return to user terminal) */
	buf[0] = 0x0f;
	ret = buspirate_sendrecv(buf, 1, 0);
	if (ret)
		return ret;

	/* Shut down serial port communication */
	ret = serialport_shutdown();
	if (ret)
		return ret;
	msg_pdbg("Bus Pirate shutdown completed.\n");

	return 0;
}

int buspirate_spi_send_command(unsigned int writecnt, unsigned int readcnt,
		const unsigned char *writearr, unsigned char *readarr)
{
	static unsigned char *buf = NULL;
	int i = 0, ret = 0;

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

	/* 3 bytes extra for CS#, len, CS#. */
	buf = realloc(buf, writecnt + readcnt + 3);
	if (!buf) {
		msg_perr("Out of memory!\n");
		exit(1); // -1
	}

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

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

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

	ret = buspirate_sendrecv(buf, i, i);

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

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

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

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

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

	return ret;
}

int buspirate_spi_read(struct flashchip *flash, uint8_t *buf, int start, int len)
{
	return spi_read_chunked(flash, buf, start, len, 12);
}

int buspirate_spi_write_256(struct flashchip *flash, uint8_t *buf, int start, int len)
{
	return spi_write_chunked(flash, buf, start, len, 12);
}