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5779d8d9 WD |
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; | |
9604b6e5 SP |
47 | read_dataflash(CFG_ENV_ADDR + index + offsetof(env_t,data), |
48 | 1, (char *)&c); | |
5779d8d9 WD |
49 | return (c); |
50 | } | |
51 | ||
52 | void env_relocate_spec (void) | |
53 | { | |
9604b6e5 | 54 | read_dataflash(CFG_ENV_ADDR, CFG_ENV_SIZE, (char *)env_ptr); |
5779d8d9 WD |
55 | } |
56 | ||
57 | int saveenv(void) | |
58 | { | |
9604b6e5 SP |
59 | /* env must be copied to do not alter env structure in memory*/ |
60 | unsigned char temp[CFG_ENV_SIZE]; | |
5779d8d9 | 61 | memcpy(temp, env_ptr, CFG_ENV_SIZE); |
9604b6e5 | 62 | return write_dataflash(CFG_ENV_ADDR, (unsigned long)temp, CFG_ENV_SIZE); |
5779d8d9 WD |
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 */ | |
9604b6e5 SP |
80 | read_dataflash(CFG_ENV_ADDR + offsetof(env_t, crc), |
81 | sizeof(ulong), (char *)&crc); | |
5779d8d9 WD |
82 | new = 0; |
83 | len = ENV_SIZE; | |
84 | off = offsetof(env_t,data); | |
85 | while (len > 0) { | |
86 | int n = (len > sizeof(buf)) ? sizeof(buf) : len; | |
9604b6e5 | 87 | read_dataflash(CFG_ENV_ADDR + off, n, (char *)buf); |
5779d8d9 WD |
88 | new = crc32 (new, buf, n); |
89 | len -= n; | |
90 | off += n; | |
91 | } | |
92 | if (crc == new) { | |
93 | gd->env_addr = offsetof(env_t,data); | |
94 | gd->env_valid = 1; | |
95 | } else { | |
96 | gd->env_addr = (ulong)&default_environment[0]; | |
97 | gd->env_valid = 0; | |
98 | } | |
99 | } | |
100 | ||
101 | return (0); | |
102 | } | |
103 | ||
104 | #endif /* CFG_ENV_IS_IN_DATAFLASH */ |