source: SVN/rincon/u-boot/common/env_sf.c @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 22 months ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 3.2 KB
Line 
1/*
2 * (C) Copyright 2000-2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
6 * Andreas Heppel <aheppel@sysgo.de>
7 *
8 * (C) Copyright 2008 Atmel Corporation
9 *
10 * See file CREDITS for list of people who contributed to this
11 * project.
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License as
15 * published by the Free Software Foundation; either version 2 of
16 * the License, or (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 * MA 02111-1307 USA
27 */
28#include <common.h>
29#include <environment.h>
30#include <spi_flash.h>
31
32#ifndef CONFIG_ENV_SPI_BUS
33# define CONFIG_ENV_SPI_BUS     0
34#endif
35#ifndef CONFIG_ENV_SPI_CS
36# define CONFIG_ENV_SPI_CS              0
37#endif
38#ifndef CONFIG_ENV_SPI_MAX_HZ
39# define CONFIG_ENV_SPI_MAX_HZ  1000000
40#endif
41#ifndef CONFIG_ENV_SPI_MODE
42# define CONFIG_ENV_SPI_MODE    SPI_MODE_3
43#endif
44
45DECLARE_GLOBAL_DATA_PTR;
46
47/* references to names in env_common.c */
48extern uchar default_environment[];
49extern int default_environment_size;
50
51char * env_name_spec = "SPI Flash";
52env_t *env_ptr;
53
54static struct spi_flash *env_flash;
55
56uchar env_get_char_spec(int index)
57{
58        return *((uchar *)(gd->env_addr + index));
59}
60
61int saveenv(void)
62{
63        u32 sector = 1;
64
65        if (!env_flash) {
66                puts("Environment SPI flash not initialized\n");
67                return 1;
68        }
69
70        if (CONFIG_ENV_SIZE > CONFIG_ENV_SECT_SIZE) {
71                sector = CONFIG_ENV_SIZE / CONFIG_ENV_SECT_SIZE;
72                if (CONFIG_ENV_SIZE % CONFIG_ENV_SECT_SIZE)
73                        sector++;
74        }
75
76        puts("Erasing SPI flash...");
77        if (spi_flash_erase(env_flash, CONFIG_ENV_OFFSET, sector * CONFIG_ENV_SECT_SIZE))
78                return 1;
79
80        puts("Writing to SPI flash...");
81        if (spi_flash_write(env_flash, CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE, env_ptr))
82                return 1;
83
84        puts("done\n");
85        return 0;
86}
87
88void env_relocate_spec(void)
89{
90        int ret;
91
92        env_flash = spi_flash_probe(CONFIG_ENV_SPI_BUS, CONFIG_ENV_SPI_CS,
93                        CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE);
94        if (!env_flash)
95                goto err_probe;
96
97        ret = spi_flash_read(env_flash, CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE, env_ptr);
98        if (ret)
99                goto err_read;
100
101        if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
102                goto err_crc;
103
104        gd->env_valid = 1;
105
106        return;
107
108err_read:
109        spi_flash_free(env_flash);
110        env_flash = NULL;
111err_probe:
112err_crc:
113        puts("*** Warning - bad CRC, using default environment\n\n");
114
115        if (default_environment_size > CONFIG_ENV_SIZE) {
116                gd->env_valid = 0;
117                puts("*** Error - default environment is too large\n\n");
118                return;
119        }
120
121        memset(env_ptr, 0, sizeof(env_t));
122        memcpy(env_ptr->data, default_environment, default_environment_size);
123        env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
124        gd->env_valid = 1;
125}
126
127int env_init(void)
128{
129        /* SPI flash isn't usable before relocation */
130        gd->env_addr = (ulong)&default_environment[0];
131        gd->env_valid = 1;
132
133        return 0;
134}
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