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c609719b WD |
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 | * 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> |
c609719b | 47 | |
957a0e69 JCPV |
48 | DECLARE_GLOBAL_DATA_PTR; |
49 | ||
6d0f6bcf | 50 | #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE |
c609719b WD |
51 | extern void *nvram_read(void *dest, const long src, size_t count); |
52 | extern void nvram_write(long dest, const void *src, size_t count); | |
53 | env_t *env_ptr = NULL; | |
54 | #else | |
0e8d1586 | 55 | env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR; |
c609719b WD |
56 | #endif |
57 | ||
58 | char * env_name_spec = "NVRAM"; | |
59 | ||
60 | extern uchar default_environment[]; | |
61 | extern int default_environment_size; | |
62 | ||
7c7a23bd WD |
63 | #ifdef CONFIG_AMIGAONEG3SE |
64 | uchar env_get_char_spec (int index) | |
65 | { | |
6d0f6bcf | 66 | #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE |
7c7a23bd WD |
67 | uchar c; |
68 | ||
0e8d1586 | 69 | nvram_read(&c, CONFIG_ENV_ADDR+index, 1); |
c609719b | 70 | |
7c7a23bd WD |
71 | return c; |
72 | #else | |
7c7a23bd WD |
73 | uchar retval; |
74 | enable_nvram(); | |
75 | retval = *((uchar *)(gd->env_addr + index)); | |
76 | disable_nvram(); | |
77 | return retval; | |
78 | #endif | |
79 | } | |
80 | #else | |
c609719b WD |
81 | uchar env_get_char_spec (int index) |
82 | { | |
6d0f6bcf | 83 | #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE |
c609719b WD |
84 | uchar c; |
85 | ||
0e8d1586 | 86 | nvram_read(&c, CONFIG_ENV_ADDR+index, 1); |
c609719b WD |
87 | |
88 | return c; | |
89 | #else | |
c609719b WD |
90 | return *((uchar *)(gd->env_addr + index)); |
91 | #endif | |
92 | } | |
7c7a23bd | 93 | #endif |
c609719b WD |
94 | |
95 | void env_relocate_spec (void) | |
96 | { | |
6d0f6bcf | 97 | #if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE) |
0e8d1586 | 98 | nvram_read(env_ptr, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE); |
c609719b | 99 | #else |
0e8d1586 | 100 | memcpy (env_ptr, (void*)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE); |
c609719b WD |
101 | #endif |
102 | } | |
103 | ||
104 | int saveenv (void) | |
105 | { | |
106 | int rcode = 0; | |
7c7a23bd WD |
107 | #ifdef CONFIG_AMIGAONEG3SE |
108 | enable_nvram(); | |
109 | #endif | |
6d0f6bcf | 110 | #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE |
0e8d1586 | 111 | nvram_write(CONFIG_ENV_ADDR, env_ptr, CONFIG_ENV_SIZE); |
c609719b | 112 | #else |
0e8d1586 | 113 | if (memcpy ((char *)CONFIG_ENV_ADDR, env_ptr, CONFIG_ENV_SIZE) == NULL) |
c609719b | 114 | rcode = 1 ; |
7c7a23bd WD |
115 | #endif |
116 | #ifdef CONFIG_AMIGAONEG3SE | |
117 | udelay(10000); | |
118 | disable_nvram(); | |
c609719b WD |
119 | #endif |
120 | return rcode; | |
121 | } | |
122 | ||
123 | ||
124 | /************************************************************************ | |
125 | * Initialize Environment use | |
126 | * | |
127 | * We are still running from ROM, so data use is limited | |
128 | */ | |
129 | int env_init (void) | |
130 | { | |
7c7a23bd WD |
131 | #ifdef CONFIG_AMIGAONEG3SE |
132 | enable_nvram(); | |
133 | #endif | |
6d0f6bcf | 134 | #if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE) |
c609719b WD |
135 | ulong crc; |
136 | uchar data[ENV_SIZE]; | |
0e8d1586 JCPV |
137 | nvram_read (&crc, CONFIG_ENV_ADDR, sizeof(ulong)); |
138 | nvram_read (data, CONFIG_ENV_ADDR+sizeof(ulong), ENV_SIZE); | |
c609719b WD |
139 | |
140 | if (crc32(0, data, ENV_SIZE) == crc) { | |
0e8d1586 | 141 | gd->env_addr = (ulong)CONFIG_ENV_ADDR + sizeof(long); |
c609719b WD |
142 | #else |
143 | if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) { | |
144 | gd->env_addr = (ulong)&(env_ptr->data); | |
145 | #endif | |
146 | gd->env_valid = 1; | |
147 | } else { | |
148 | gd->env_addr = (ulong)&default_environment[0]; | |
149 | gd->env_valid = 0; | |
150 | } | |
7c7a23bd WD |
151 | #ifdef CONFIG_AMIGAONEG3SE |
152 | disable_nvram(); | |
153 | #endif | |
c609719b WD |
154 | return (0); |
155 | } |