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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
29/* Length of half a clock period in usecs */
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000030int bitbang_spi_half_period = 0;
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000031
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000032enum bitbang_spi_master bitbang_spi_master = BITBANG_SPI_INVALID;
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000033
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000034const struct bitbang_spi_master_entry bitbang_spi_master_table[] = {
35 {}, /* This entry corresponds to BITBANG_SPI_INVALID. */
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000036};
37
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000038const int bitbang_spi_master_count = ARRAY_SIZE(bitbang_spi_master_table);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000039
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000040void bitbang_spi_set_cs(int val)
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000041{
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000042 bitbang_spi_master_table[bitbang_spi_master].set_cs(val);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000043}
44
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000045void bitbang_spi_set_sck(int val)
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000046{
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000047 bitbang_spi_master_table[bitbang_spi_master].set_sck(val);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000048}
49
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000050void bitbang_spi_set_mosi(int val)
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000051{
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000052 bitbang_spi_master_table[bitbang_spi_master].set_mosi(val);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000053}
54
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000055int bitbang_spi_get_miso(void)
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000056{
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000057 return bitbang_spi_master_table[bitbang_spi_master].get_miso();
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000058}
59
60int bitbang_spi_init(void)
61{
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000062 bitbang_spi_set_cs(1);
63 bitbang_spi_set_sck(0);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000064 buses_supported = CHIP_BUSTYPE_SPI;
65 return 0;
66}
67
68uint8_t bitbang_spi_readwrite_byte(uint8_t val)
69{
70 uint8_t ret = 0;
71 int i;
72
73 for (i = 7; i >= 0; i--) {
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000074 bitbang_spi_set_mosi((val >> i) & 1);
75 programmer_delay(bitbang_spi_half_period);
76 bitbang_spi_set_sck(1);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000077 ret <<= 1;
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +000078 ret |= bitbang_spi_get_miso();
79 programmer_delay(bitbang_spi_half_period);
80 bitbang_spi_set_sck(0);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000081 }
82 return ret;
83}
84
85int bitbang_spi_send_command(unsigned int writecnt, unsigned int readcnt,
86 const unsigned char *writearr, unsigned char *readarr)
87{
88 static unsigned char *bufout = NULL;
89 static unsigned char *bufin = NULL;
90 static int oldbufsize = 0;
Carl-Daniel Hailfingerb7e01452009-11-25 16:58:17 +000091 int bufsize;
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +000092 int i;
93
94 /* Arbitrary size limitation here. We're only constrained by memory. */
95 if (writecnt > 65536 || readcnt > 65536)
96 return SPI_INVALID_LENGTH;
97
Carl-Daniel Hailfingerb7e01452009-11-25 16:58:17 +000098 bufsize = max(writecnt + readcnt, 260);
99 /* Never shrink. realloc() calls are expensive. */
100 if (bufsize > oldbufsize) {
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +0000101 bufout = realloc(bufout, bufsize);
102 if (!bufout) {
Sean Nelson676a2322010-01-09 23:58:37 +0000103 msg_perr("Out of memory!\n");
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +0000104 if (bufin)
105 free(bufin);
106 exit(1);
107 }
108 bufin = realloc(bufout, bufsize);
109 if (!bufin) {
Sean Nelson676a2322010-01-09 23:58:37 +0000110 msg_perr("Out of memory!\n");
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +0000111 if (bufout)
112 free(bufout);
113 exit(1);
114 }
Carl-Daniel Hailfingerb7e01452009-11-25 16:58:17 +0000115 oldbufsize = bufsize;
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +0000116 }
117
118 memcpy(bufout, writearr, writecnt);
119 /* Shift out 0x00 while reading data. */
120 memset(bufout + writecnt, 0x00, readcnt);
121 /* Make sure any non-read data is 0xff. */
122 memset(bufin + writecnt, 0xff, readcnt);
123
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +0000124 bitbang_spi_set_cs(0);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +0000125 for (i = 0; i < readcnt + writecnt; i++) {
126 bufin[i] = bitbang_spi_readwrite_byte(bufout[i]);
127 }
Carl-Daniel Hailfinger3a4781e2009-10-01 14:51:25 +0000128 programmer_delay(bitbang_spi_half_period);
129 bitbang_spi_set_cs(1);
130 programmer_delay(bitbang_spi_half_period);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +0000131 memcpy(readarr, bufin + writecnt, readcnt);
132
133 return 0;
134}
135
136int bitbang_spi_read(struct flashchip *flash, uint8_t *buf, int start, int len)
137{
138 /* Maximum read length is unlimited, use 64k bytes. */
139 return spi_read_chunked(flash, buf, start, len, 64 * 1024);
140}
141
142int bitbang_spi_write_256(struct flashchip *flash, uint8_t *buf)
143{
144 int total_size = 1024 * flash->total_size;
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +0000145
Sean Nelson676a2322010-01-09 23:58:37 +0000146 msg_pdbg("total_size is %d\n", total_size);
Carl-Daniel Hailfinger5824fbf2010-05-21 23:09:42 +0000147 return spi_write_chunked(flash, buf, 0, total_size, 256);
Carl-Daniel Hailfinger547872b2009-09-28 13:15:16 +0000148}