summaryrefslogtreecommitdiffstats
path: root/pony_spi.c
blob: b5dfc2f7f5309178cd406a9211d962cc12e4aaae (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
/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2012 Virgil-Adrian Teaca
 *
 * 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
 */

/* Driver for the SI-Prog like hardware by Lancos.com.
 * See http://www.lancos.com/siprogsch.html for schematics and instructions.
 */

#include <stdlib.h>
#include <string.h>

#include "flash.h"
#include "programmer.h"

/* We have:

 MOSI -----> DTR
 MISO -----> CTS
 SCK  --+--> RTS
        +--> DSR
 CS#  -----> TXD

*/

enum pony_type {
	TYPE_SI_PROG,
	TYPE_SERBANG,
};

/* The hardware programmer used. */
static enum pony_type pony_type = TYPE_SI_PROG;

static void pony_bitbang_set_cs(int val)
{
	if (pony_type == TYPE_SI_PROG)
	{
		/* CS# is negated by the SI-Prog programmer. */
		val ^=  1;
	}
	sp_set_pin(PIN_TXD, val);
}

static void pony_bitbang_set_sck(int val)
{
	sp_set_pin(PIN_RTS, val);
}

static void pony_bitbang_set_mosi(int val)
{
	sp_set_pin(PIN_DTR, val);
}

static int pony_bitbang_get_miso(void)
{
	int tmp;

	tmp = sp_get_pin(PIN_CTS);

	if (pony_type == TYPE_SERBANG)
	{
		/* MISO is negated by the SERBANG programmer. */
		tmp ^= 1;
	}
	return tmp;
}

static const struct bitbang_spi_master bitbang_spi_master_pony = {
	.type = BITBANG_SPI_MASTER_PONY,
	.set_cs = pony_bitbang_set_cs,
	.set_sck = pony_bitbang_set_sck,
	.set_mosi = pony_bitbang_set_mosi,
	.get_miso = pony_bitbang_get_miso,
	.half_period = 0,
};

int pony_spi_init(void)
{
	char *arg = NULL;
	int i, data_in, data_out, have_device = 0;
	int have_prog = 1;

	/* The parameter is on format "dev=/dev/device,type=serbang" */
	arg = extract_programmer_param("dev");

	if (arg && strlen(arg)) {
		sp_fd = sp_openserport( arg, 9600 );
		have_device++;
	}
	free(arg);

	if (!have_device) {
		msg_perr("Error: No valid device specified.\n"
			 "Use flashrom -p pony_spi:dev=/dev/device\n");

		return 1;
	}
	/* Register the shutdown callback. */
	if (register_shutdown(serialport_shutdown, NULL)) {
		return 1;
	}
	arg = extract_programmer_param("type");

	if (arg) {
		if (!strcasecmp( arg, "serbang")) {
			pony_type = TYPE_SERBANG;
		} else if (!strcasecmp( arg, "si_prog") ) {
			pony_type = TYPE_SI_PROG;
		} else {
			msg_perr("Error: Invalid programmer type specified.\n");
			free(arg);
			return 1;
		}
	}
	free(arg);

	msg_pdbg("Using the %s programmer.\n", ((pony_type == TYPE_SI_PROG ) ? "SI-Prog" : "SERBANG"));
	/*
	 * Detect if there is a SI-Prog compatible programmer connected.
	 */
	pony_bitbang_set_cs(1);
	pony_bitbang_set_mosi(1);

	/* We toggle SCK while we keep MOSI and CS# on. */
	for (i = 1; i <= 10; ++i) {
		data_out = i & 1;
		sp_set_pin(PIN_RTS, data_out);
		programmer_delay( 1000 );
		data_in = sp_get_pin(PIN_DSR);

		if (data_out != data_in) {
			have_prog = 0;
			break;
		}
	}

	if (!have_prog) {
		msg_perr( "No SI-Prog compatible hardware detected.\n" );
		return 1;
	}

	if (bitbang_spi_init(&bitbang_spi_master_pony)) {
		return 1;
	}
	return 0;
}
OpenPOWER on IntegriCloud