env_nvram.c 4.05 KB
Newer Older
Alexander Yurtsev's avatar
Alexander Yurtsev committed
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
/*
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Andreas Heppel <aheppel@sysgo.de>

 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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; either version 2 of
 * the License, or (at your option) any later version.
 *
 * 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
 *
 * It might not be possible in all cases to use 'memcpy()' to copy
 * the environment to NVRAM, as the NVRAM might not be mapped into
 * the memory space. (I.e. this is the case for the BAB750). In those
 * cases it might be possible to access the NVRAM using a different
 * method. For example, the RTC on the BAB750 is accessible in IO
 * space using its address and data registers. To enable usage of
 * NVRAM in those cases I invented the functions 'nvram_read()' and
 * 'nvram_write()', which will be activated upon the configuration
 * #define CONFIG_SYS_NVRAM_ACCESS_ROUTINE. Note, that those functions are
 * strongly dependent on the used HW, and must be redefined for each
 * board that wants to use them.
 */

#include <common.h>
#include <command.h>
#include <environment.h>
#include <linux/stddef.h>

DECLARE_GLOBAL_DATA_PTR;

#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
extern void *nvram_read(void *dest, const long src, size_t count);
extern void nvram_write(long dest, const void *src, size_t count);
env_t *env_ptr = NULL;
#else
env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
#endif

char * env_name_spec = "NVRAM";

extern uchar default_environment[];

#ifdef CONFIG_AMIGAONEG3SE
uchar env_get_char_spec (int index)
{
#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
	uchar c;

	nvram_read(&c, CONFIG_ENV_ADDR+index, 1);

	return c;
#else
	uchar retval;
	enable_nvram();
	retval = *((uchar *)(gd->env_addr + index));
	disable_nvram();
	return retval;
#endif
}
#else
uchar env_get_char_spec (int index)
{
#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
	uchar c;

	nvram_read(&c, CONFIG_ENV_ADDR+index, 1);

	return c;
#else
	return *((uchar *)(gd->env_addr + index));
#endif
}
#endif

void env_relocate_spec (void)
{
#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
	nvram_read(env_ptr, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
#else
	memcpy (env_ptr, (void*)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
#endif
}

int saveenv (void)
{
	int rcode = 0;
#ifdef CONFIG_AMIGAONEG3SE
	enable_nvram();
#endif
#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
	nvram_write(CONFIG_ENV_ADDR, env_ptr, CONFIG_ENV_SIZE);
#else
	if (memcpy ((char *)CONFIG_ENV_ADDR, env_ptr, CONFIG_ENV_SIZE) == NULL)
		    rcode = 1 ;
#endif
#ifdef CONFIG_AMIGAONEG3SE
	udelay(10000);
	disable_nvram();
#endif
	return rcode;
}


/************************************************************************
 * Initialize Environment use
 *
 * We are still running from ROM, so data use is limited
 */
int env_init (void)
{
#ifdef CONFIG_AMIGAONEG3SE
	enable_nvram();
#endif
#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
	ulong crc;
	uchar data[ENV_SIZE];
	nvram_read (&crc, CONFIG_ENV_ADDR, sizeof(ulong));
	nvram_read (data, CONFIG_ENV_ADDR+sizeof(ulong), ENV_SIZE);

	if (crc32(0, data, ENV_SIZE) == crc) {
		gd->env_addr  = (ulong)CONFIG_ENV_ADDR + sizeof(long);
#else
	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
		gd->env_addr  = (ulong)&(env_ptr->data);
#endif
		gd->env_valid = 1;
	} else {
		gd->env_addr  = (ulong)&default_environment[0];
		gd->env_valid = 0;
	}
#ifdef CONFIG_AMIGAONEG3SE
	disable_nvram();
#endif
	return (0);
}