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c609719b | 1 | /* |
ea882baf | 2 | * (C) Copyright 2000-2010 |
c609719b WD |
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 | * See file CREDITS for list of people who contributed to this | |
9 | * project. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License as | |
13 | * published by the Free Software Foundation; either version 2 of | |
14 | * the License, or (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
24 | * MA 02111-1307 USA | |
25 | */ | |
26 | ||
27 | /* | |
28 | * 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de> | |
29 | * | |
30 | * It might not be possible in all cases to use 'memcpy()' to copy | |
31 | * the environment to NVRAM, as the NVRAM might not be mapped into | |
32 | * the memory space. (I.e. this is the case for the BAB750). In those | |
33 | * cases it might be possible to access the NVRAM using a different | |
34 | * method. For example, the RTC on the BAB750 is accessible in IO | |
35 | * space using its address and data registers. To enable usage of | |
36 | * NVRAM in those cases I invented the functions 'nvram_read()' and | |
37 | * 'nvram_write()', which will be activated upon the configuration | |
6d0f6bcf | 38 | * #define CONFIG_SYS_NVRAM_ACCESS_ROUTINE. Note, that those functions are |
c609719b WD |
39 | * strongly dependent on the used HW, and must be redefined for each |
40 | * board that wants to use them. | |
41 | */ | |
42 | ||
43 | #include <common.h> | |
c609719b WD |
44 | #include <command.h> |
45 | #include <environment.h> | |
c609719b | 46 | #include <linux/stddef.h> |
ea882baf WD |
47 | #include <search.h> |
48 | #include <errno.h> | |
c609719b | 49 | |
957a0e69 JCPV |
50 | DECLARE_GLOBAL_DATA_PTR; |
51 | ||
6d0f6bcf | 52 | #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE |
c609719b WD |
53 | extern void *nvram_read(void *dest, const long src, size_t count); |
54 | extern void nvram_write(long dest, const void *src, size_t count); | |
55 | env_t *env_ptr = NULL; | |
56 | #else | |
0e8d1586 | 57 | env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR; |
c609719b WD |
58 | #endif |
59 | ||
60 | char * env_name_spec = "NVRAM"; | |
61 | ||
62 | extern uchar default_environment[]; | |
c609719b | 63 | |
ea882baf | 64 | uchar env_get_char_spec(int index) |
c609719b | 65 | { |
6d0f6bcf | 66 | #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE |
c609719b WD |
67 | uchar c; |
68 | ||
0e8d1586 | 69 | nvram_read(&c, CONFIG_ENV_ADDR+index, 1); |
c609719b WD |
70 | |
71 | return c; | |
72 | #else | |
c609719b WD |
73 | return *((uchar *)(gd->env_addr + index)); |
74 | #endif | |
75 | } | |
76 | ||
ea882baf | 77 | void env_relocate_spec(void) |
c609719b | 78 | { |
ea882baf WD |
79 | char buf[CONFIG_ENV_SIZE]; |
80 | ||
6d0f6bcf | 81 | #if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE) |
ea882baf | 82 | nvram_read(buf, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE); |
c609719b | 83 | #else |
ea882baf | 84 | memcpy(buf, (void*)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE); |
c609719b | 85 | #endif |
ea882baf | 86 | env_import(buf, 1); |
c609719b WD |
87 | } |
88 | ||
ea882baf | 89 | int saveenv(void) |
c609719b | 90 | { |
ea882baf WD |
91 | env_t env_new; |
92 | ssize_t len; | |
93 | char *res; | |
94 | int rcode = 0; | |
95 | ||
96 | res = (char *)&env_new.data; | |
2eb1573f | 97 | len = hexport_r(&env_htab, '\0', &res, ENV_SIZE); |
ea882baf WD |
98 | if (len < 0) { |
99 | error("Cannot export environment: errno = %d\n", errno); | |
100 | return 1; | |
101 | } | |
102 | env_new.crc = crc32(0, env_new.data, ENV_SIZE); | |
103 | ||
6d0f6bcf | 104 | #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE |
ea882baf | 105 | nvram_write(CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE); |
c609719b | 106 | #else |
ea882baf WD |
107 | if (memcpy((char *)CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE) == NULL) |
108 | rcode = 1; | |
c609719b WD |
109 | #endif |
110 | return rcode; | |
111 | } | |
112 | ||
113 | ||
ea882baf | 114 | /* |
c609719b WD |
115 | * Initialize Environment use |
116 | * | |
117 | * We are still running from ROM, so data use is limited | |
118 | */ | |
ea882baf | 119 | int env_init(void) |
c609719b | 120 | { |
6d0f6bcf | 121 | #if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE) |
c609719b WD |
122 | ulong crc; |
123 | uchar data[ENV_SIZE]; | |
ea882baf WD |
124 | |
125 | nvram_read(&crc, CONFIG_ENV_ADDR, sizeof(ulong)); | |
126 | nvram_read(data, CONFIG_ENV_ADDR+sizeof(ulong), ENV_SIZE); | |
c609719b WD |
127 | |
128 | if (crc32(0, data, ENV_SIZE) == crc) { | |
0e8d1586 | 129 | gd->env_addr = (ulong)CONFIG_ENV_ADDR + sizeof(long); |
c609719b WD |
130 | #else |
131 | if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) { | |
132 | gd->env_addr = (ulong)&(env_ptr->data); | |
133 | #endif | |
134 | gd->env_valid = 1; | |
135 | } else { | |
136 | gd->env_addr = (ulong)&default_environment[0]; | |
137 | gd->env_valid = 0; | |
138 | } | |
c609719b WD |
139 | return (0); |
140 | } |