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wdenkc6097192002-11-03 00:24:07 +00001/*
Wolfgang Denkea882ba2010-06-20 23:33:59 +02002 * (C) Copyright 2000-2010
wdenkc6097192002-11-03 00:24:07 +00003 * 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
Wolfgang Denk3765b3e2013-10-07 13:07:26 +02008 * SPDX-License-Identifier: GPL-2.0+
wdenkc6097192002-11-03 00:24:07 +00009 */
10
11/*
12 * 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
13 *
14 * It might not be possible in all cases to use 'memcpy()' to copy
15 * the environment to NVRAM, as the NVRAM might not be mapped into
16 * the memory space. (I.e. this is the case for the BAB750). In those
17 * cases it might be possible to access the NVRAM using a different
18 * method. For example, the RTC on the BAB750 is accessible in IO
19 * space using its address and data registers. To enable usage of
20 * NVRAM in those cases I invented the functions 'nvram_read()' and
21 * 'nvram_write()', which will be activated upon the configuration
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020022 * #define CONFIG_SYS_NVRAM_ACCESS_ROUTINE. Note, that those functions are
wdenkc6097192002-11-03 00:24:07 +000023 * strongly dependent on the used HW, and must be redefined for each
24 * board that wants to use them.
25 */
26
27#include <common.h>
wdenkc6097192002-11-03 00:24:07 +000028#include <command.h>
29#include <environment.h>
wdenkc6097192002-11-03 00:24:07 +000030#include <linux/stddef.h>
Wolfgang Denkea882ba2010-06-20 23:33:59 +020031#include <search.h>
32#include <errno.h>
wdenkc6097192002-11-03 00:24:07 +000033
Jean-Christophe PLAGNIOL-VILLARD957a0e62008-09-10 22:47:59 +020034DECLARE_GLOBAL_DATA_PTR;
35
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020036#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
wdenkc6097192002-11-03 00:24:07 +000037extern void *nvram_read(void *dest, const long src, size_t count);
38extern void nvram_write(long dest, const void *src, size_t count);
Igor Grinberg91494ca2011-11-07 01:14:04 +000039env_t *env_ptr;
wdenkc6097192002-11-03 00:24:07 +000040#else
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +020041env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
wdenkc6097192002-11-03 00:24:07 +000042#endif
43
Igor Grinberg91494ca2011-11-07 01:14:04 +000044char *env_name_spec = "NVRAM";
wdenkc6097192002-11-03 00:24:07 +000045
Igor Grinbergbf95df42011-12-26 03:33:10 +000046#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
Wolfgang Denkea882ba2010-06-20 23:33:59 +020047uchar env_get_char_spec(int index)
wdenkc6097192002-11-03 00:24:07 +000048{
wdenkc6097192002-11-03 00:24:07 +000049 uchar c;
50
Igor Grinberg91494ca2011-11-07 01:14:04 +000051 nvram_read(&c, CONFIG_ENV_ADDR + index, 1);
wdenkc6097192002-11-03 00:24:07 +000052
53 return c;
wdenkc6097192002-11-03 00:24:07 +000054}
Igor Grinbergbf95df42011-12-26 03:33:10 +000055#endif
wdenkc6097192002-11-03 00:24:07 +000056
Wolfgang Denkea882ba2010-06-20 23:33:59 +020057void env_relocate_spec(void)
wdenkc6097192002-11-03 00:24:07 +000058{
Tom Rinicd0f4fa2013-04-05 14:55:21 -040059 char buf[CONFIG_ENV_SIZE];
Wolfgang Denkea882ba2010-06-20 23:33:59 +020060
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020061#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
Wolfgang Denkea882ba2010-06-20 23:33:59 +020062 nvram_read(buf, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
wdenkc6097192002-11-03 00:24:07 +000063#else
Tom Rinicd0f4fa2013-04-05 14:55:21 -040064 memcpy(buf, (void *)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
wdenkc6097192002-11-03 00:24:07 +000065#endif
Wolfgang Denkea882ba2010-06-20 23:33:59 +020066 env_import(buf, 1);
wdenkc6097192002-11-03 00:24:07 +000067}
68
Wolfgang Denkea882ba2010-06-20 23:33:59 +020069int saveenv(void)
wdenkc6097192002-11-03 00:24:07 +000070{
Tom Rinicd0f4fa2013-04-05 14:55:21 -040071 env_t env_new;
Wolfgang Denkea882ba2010-06-20 23:33:59 +020072 ssize_t len;
73 char *res;
74 int rcode = 0;
75
Tom Rinicd0f4fa2013-04-05 14:55:21 -040076 res = (char *)&env_new.data;
Joe Hershbergerbe112352012-12-11 22:16:23 -060077 len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
Wolfgang Denkea882ba2010-06-20 23:33:59 +020078 if (len < 0) {
79 error("Cannot export environment: errno = %d\n", errno);
80 return 1;
81 }
Tom Rinicd0f4fa2013-04-05 14:55:21 -040082 env_new.crc = crc32(0, env_new.data, ENV_SIZE);
Wolfgang Denkea882ba2010-06-20 23:33:59 +020083
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020084#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
Tom Rinicd0f4fa2013-04-05 14:55:21 -040085 nvram_write(CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE);
86#else
87 if (memcpy((char *)CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE) == NULL)
88 rcode = 1;
wdenkc6097192002-11-03 00:24:07 +000089#endif
90 return rcode;
91}
92
Wolfgang Denkea882ba2010-06-20 23:33:59 +020093/*
wdenkc6097192002-11-03 00:24:07 +000094 * Initialize Environment use
95 *
96 * We are still running from ROM, so data use is limited
97 */
Wolfgang Denkea882ba2010-06-20 23:33:59 +020098int env_init(void)
wdenkc6097192002-11-03 00:24:07 +000099{
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200100#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
wdenkc6097192002-11-03 00:24:07 +0000101 ulong crc;
Tom Rinicd0f4fa2013-04-05 14:55:21 -0400102 uchar data[ENV_SIZE];
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200103
104 nvram_read(&crc, CONFIG_ENV_ADDR, sizeof(ulong));
Igor Grinberg91494ca2011-11-07 01:14:04 +0000105 nvram_read(data, CONFIG_ENV_ADDR + sizeof(ulong), ENV_SIZE);
wdenkc6097192002-11-03 00:24:07 +0000106
107 if (crc32(0, data, ENV_SIZE) == crc) {
Igor Grinberg91494ca2011-11-07 01:14:04 +0000108 gd->env_addr = (ulong)CONFIG_ENV_ADDR + sizeof(long);
wdenkc6097192002-11-03 00:24:07 +0000109#else
110 if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
Igor Grinberg91494ca2011-11-07 01:14:04 +0000111 gd->env_addr = (ulong)&env_ptr->data;
wdenkc6097192002-11-03 00:24:07 +0000112#endif
Igor Grinberg91494ca2011-11-07 01:14:04 +0000113 gd->env_valid = 1;
wdenkc6097192002-11-03 00:24:07 +0000114 } else {
Igor Grinberg91494ca2011-11-07 01:14:04 +0000115 gd->env_addr = (ulong)&default_environment[0];
116 gd->env_valid = 0;
wdenkc6097192002-11-03 00:24:07 +0000117 }
Igor Grinberg91494ca2011-11-07 01:14:04 +0000118
119 return 0;
wdenkc6097192002-11-03 00:24:07 +0000120}