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Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +00001/*
2 * This file is part of the flashrom project.
3 *
Carl-Daniel Hailfinger5824fbf2010-05-21 23:09:42 +00004 * Copyright (C) 2009, 2010 Carl-Daniel Hailfinger
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +00005 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
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 Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20#include <stdio.h>
21#include <stdint.h>
22#include <string.h>
23#include <stdlib.h>
24#include <ctype.h>
25#include "flash.h"
Sean Nelson14ba6682010-02-26 05:48:29 +000026#include "chipdrivers.h"
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000027#include "spi.h"
28
Carl-Daniel Hailfinger0d974e72010-07-17 12:54:09 +000029/* Length of half a clock period in usecs. */
30static int bitbang_spi_half_period;
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000031
Michael Karcher62175a02010-07-17 23:27:47 +000032static const struct bitbang_spi_master *bitbang_spi_master = NULL;
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000033
Carl-Daniel Hailfinger0d974e72010-07-17 12:54:09 +000034/* Note that CS# is active low, so val=0 means the chip is active. */
35static void bitbang_spi_set_cs(int val)
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000036{
Michael Karcher62175a02010-07-17 23:27:47 +000037 bitbang_spi_master->set_cs(val);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000038}
39
Carl-Daniel Hailfinger0d974e72010-07-17 12:54:09 +000040static void bitbang_spi_set_sck(int val)
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000041{
Michael Karcher62175a02010-07-17 23:27:47 +000042 bitbang_spi_master->set_sck(val);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000043}
44
Carl-Daniel Hailfinger0d974e72010-07-17 12:54:09 +000045static void bitbang_spi_set_mosi(int val)
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000046{
Michael Karcher62175a02010-07-17 23:27:47 +000047 bitbang_spi_master->set_mosi(val);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000048}
49
Carl-Daniel Hailfinger0d974e72010-07-17 12:54:09 +000050static int bitbang_spi_get_miso(void)
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000051{
Michael Karcher62175a02010-07-17 23:27:47 +000052 return bitbang_spi_master->get_miso();
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000053}
54
Michael Karcher62175a02010-07-17 23:27:47 +000055int bitbang_spi_init(const struct bitbang_spi_master *master, int halfperiod)
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000056{
Carl-Daniel Hailfinger17e23ac2010-07-18 14:42:28 +000057 /* BITBANG_SPI_INVALID is 0, so if someone forgot to initialize ->type,
58 * we catch it here. Same goes for missing initialization of bitbanging
59 * functions.
60 */
61 if (!master || master->type == BITBANG_SPI_INVALID || !master->set_cs ||
62 !master->set_sck || !master->set_mosi || !master->get_miso) {
63 msg_perr("Incomplete bitbanging SPI master setting! Please "
64 "report a bug at flashrom@flashrom.org\n");
65 return 1;
66 }
Carl-Daniel Hailfinger0d974e72010-07-17 12:54:09 +000067 bitbang_spi_master = master;
68 bitbang_spi_half_period = halfperiod;
69
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000070 bitbang_spi_set_cs(1);
71 bitbang_spi_set_sck(0);
Carl-Daniel Hailfinger0d974e72010-07-17 12:54:09 +000072 bitbang_spi_set_mosi(0);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000073 return 0;
74}
75
Carl-Daniel Hailfinger0d974e72010-07-17 12:54:09 +000076static uint8_t bitbang_spi_readwrite_byte(uint8_t val)
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000077{
78 uint8_t ret = 0;
79 int i;
80
81 for (i = 7; i >= 0; i--) {
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000082 bitbang_spi_set_mosi((val >> i) & 1);
83 programmer_delay(bitbang_spi_half_period);
84 bitbang_spi_set_sck(1);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000085 ret <<= 1;
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000086 ret |= bitbang_spi_get_miso();
87 programmer_delay(bitbang_spi_half_period);
88 bitbang_spi_set_sck(0);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000089 }
90 return ret;
91}
92
93int bitbang_spi_send_command(unsigned int writecnt, unsigned int readcnt,
94 const unsigned char *writearr, unsigned char *readarr)
95{
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000096 int i;
97
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000098 bitbang_spi_set_cs(0);
Michael Karcher1a854fc2010-07-17 10:42:34 +000099 for (i = 0; i < writecnt; i++)
100 bitbang_spi_readwrite_byte(writearr[i]);
101 for (i = 0; i < readcnt; i++)
102 readarr[i] = bitbang_spi_readwrite_byte(0);
103
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +0000104 programmer_delay(bitbang_spi_half_period);
105 bitbang_spi_set_cs(1);
106 programmer_delay(bitbang_spi_half_period);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +0000107
108 return 0;
109}
110
111int bitbang_spi_read(struct flashchip *flash, uint8_t *buf, int start, int len)
112{
113 /* Maximum read length is unlimited, use 64k bytes. */
114 return spi_read_chunked(flash, buf, start, len, 64 * 1024);
115}
116
Carl-Daniel Hailfinger9a795d82010-07-14 16:19:05 +0000117int bitbang_spi_write_256(struct flashchip *flash, uint8_t *buf, int start, int len)
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +0000118{
Carl-Daniel Hailfinger9a795d82010-07-14 16:19:05 +0000119 return spi_write_chunked(flash, buf, start, len, 256);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +0000120}