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1 | /* LowLevel function for DataFlash environment support |
2 | * Author : Gilles Gastaldi (Atmel) | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License as | |
6 | * published by the Free Software Foundation; either version 2 of | |
7 | * the License, or (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
17 | * MA 02111-1307 USA | |
18 | * | |
19 | */ | |
20 | #include <common.h> | |
21 | ||
22 | #if defined(CFG_ENV_IS_IN_DATAFLASH) /* Environment is in DataFlash */ | |
23 | ||
24 | #include <command.h> | |
25 | #include <environment.h> | |
26 | #include <linux/stddef.h> | |
5779d8d9 WD |
27 | #include <dataflash.h> |
28 | ||
d87080b7 WD |
29 | DECLARE_GLOBAL_DATA_PTR; |
30 | ||
5779d8d9 WD |
31 | env_t *env_ptr = NULL; |
32 | ||
33 | char * env_name_spec = "dataflash"; | |
34 | ||
35 | extern int read_dataflash (unsigned long addr, unsigned long size, char | |
36 | *result); | |
37 | extern int write_dataflash (unsigned long addr_dest, unsigned long addr_src, | |
38 | unsigned long size); | |
39 | extern int AT91F_DataflashInit (void); | |
40 | extern uchar default_environment[]; | |
41 | /* extern int default_environment_size; */ | |
42 | ||
43 | ||
44 | uchar env_get_char_spec (int index) | |
45 | { | |
46 | uchar c; | |
47 | read_dataflash (CFG_ENV_ADDR+index+offsetof(env_t,data),1,&c); | |
48 | return (c); | |
49 | } | |
50 | ||
51 | void env_relocate_spec (void) | |
52 | { | |
53 | read_dataflash (CFG_ENV_ADDR,CFG_ENV_SIZE,(uchar *)env_ptr); | |
54 | } | |
55 | ||
56 | int saveenv(void) | |
57 | { | |
58 | /* env must be copied to do not alter env structure in memory*/ | |
59 | unsigned char temp[CFG_ENV_SIZE]; | |
60 | int i; | |
61 | memcpy(temp, env_ptr, CFG_ENV_SIZE); | |
62 | return write_dataflash (CFG_ENV_ADDR, (unsigned long)temp, CFG_ENV_SIZE); | |
63 | } | |
64 | ||
65 | /************************************************************************ | |
66 | * Initialize Environment use | |
67 | * | |
68 | * We are still running from ROM, so data use is limited | |
69 | * Use a (moderately small) buffer on the stack | |
70 | */ | |
71 | int env_init(void) | |
72 | { | |
5779d8d9 WD |
73 | ulong crc, len, new; |
74 | unsigned off; | |
75 | uchar buf[64]; | |
76 | if (gd->env_valid == 0){ | |
77 | AT91F_DataflashInit(); /* prepare for DATAFLASH read/write */ | |
78 | ||
79 | /* read old CRC */ | |
80 | read_dataflash (CFG_ENV_ADDR+offsetof(env_t,crc),sizeof(ulong),&crc); | |
81 | new = 0; | |
82 | len = ENV_SIZE; | |
83 | off = offsetof(env_t,data); | |
84 | while (len > 0) { | |
85 | int n = (len > sizeof(buf)) ? sizeof(buf) : len; | |
86 | read_dataflash (CFG_ENV_ADDR+off,n , buf); | |
87 | new = crc32 (new, buf, n); | |
88 | len -= n; | |
89 | off += n; | |
90 | } | |
91 | if (crc == new) { | |
92 | gd->env_addr = offsetof(env_t,data); | |
93 | gd->env_valid = 1; | |
94 | } else { | |
95 | gd->env_addr = (ulong)&default_environment[0]; | |
96 | gd->env_valid = 0; | |
97 | } | |
98 | } | |
99 | ||
100 | return (0); | |
101 | } | |
102 | ||
103 | #endif /* CFG_ENV_IS_IN_DATAFLASH */ |