]>
Commit | Line | Data |
---|---|---|
0bc4a1ac 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 | #include <common.h> | |
0bc4a1ac WD |
28 | #include <command.h> |
29 | #include <environment.h> | |
0bc4a1ac | 30 | #include <linux/stddef.h> |
548738b4 HS |
31 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
32 | #include <i2c.h> | |
33 | #endif | |
0bc4a1ac | 34 | |
d87080b7 WD |
35 | DECLARE_GLOBAL_DATA_PTR; |
36 | ||
0bc4a1ac WD |
37 | env_t *env_ptr = NULL; |
38 | ||
39 | char * env_name_spec = "EEPROM"; | |
548738b4 HS |
40 | int env_eeprom_bus = -1; |
41 | ||
42 | static int eeprom_bus_read (unsigned dev_addr, unsigned offset, uchar *buffer, | |
43 | unsigned cnt) | |
44 | { | |
45 | int rcode; | |
46 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) | |
47 | int old_bus = i2c_get_bus_num(); | |
48 | ||
49 | if (gd->flags & GD_FLG_RELOC) { | |
50 | if (env_eeprom_bus == -1) { | |
51 | I2C_MUX_DEVICE *dev = NULL; | |
52 | dev = i2c_mux_ident_muxstring( | |
53 | (uchar *)CONFIG_I2C_ENV_EEPROM_BUS); | |
54 | if (dev != NULL) { | |
55 | env_eeprom_bus = dev->busid; | |
56 | } else | |
57 | printf ("error adding env eeprom bus.\n"); | |
58 | } | |
59 | if (old_bus != env_eeprom_bus) { | |
60 | i2c_set_bus_num(env_eeprom_bus); | |
61 | old_bus = env_eeprom_bus; | |
62 | } | |
63 | } else { | |
64 | rcode = i2c_mux_ident_muxstring_f( | |
65 | (uchar *)CONFIG_I2C_ENV_EEPROM_BUS); | |
66 | } | |
67 | #endif | |
68 | ||
69 | rcode = eeprom_read (dev_addr, offset, buffer, cnt); | |
70 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) | |
71 | if (old_bus != env_eeprom_bus) | |
72 | i2c_set_bus_num(old_bus); | |
73 | #endif | |
74 | return rcode; | |
75 | } | |
76 | ||
77 | static int eeprom_bus_write (unsigned dev_addr, unsigned offset, uchar *buffer, | |
78 | unsigned cnt) | |
79 | { | |
80 | int rcode; | |
81 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) | |
82 | int old_bus = i2c_get_bus_num(); | |
83 | ||
84 | rcode = i2c_mux_ident_muxstring_f((uchar *)CONFIG_I2C_ENV_EEPROM_BUS); | |
85 | #endif | |
86 | rcode = eeprom_write (dev_addr, offset, buffer, cnt); | |
87 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) | |
88 | i2c_set_bus_num(old_bus); | |
89 | #endif | |
90 | return rcode; | |
91 | } | |
0bc4a1ac | 92 | |
0bc4a1ac WD |
93 | uchar env_get_char_spec (int index) |
94 | { | |
95 | uchar c; | |
96 | ||
548738b4 | 97 | eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR, |
0e8d1586 | 98 | CONFIG_ENV_OFFSET+index+offsetof(env_t,data), |
0bc4a1ac WD |
99 | &c, 1); |
100 | ||
101 | return (c); | |
102 | } | |
103 | ||
104 | void env_relocate_spec (void) | |
105 | { | |
548738b4 | 106 | eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR, |
0e8d1586 | 107 | CONFIG_ENV_OFFSET, |
0bc4a1ac | 108 | (uchar*)env_ptr, |
0e8d1586 | 109 | CONFIG_ENV_SIZE); |
0bc4a1ac WD |
110 | } |
111 | ||
112 | int saveenv(void) | |
113 | { | |
548738b4 | 114 | return eeprom_bus_write (CONFIG_SYS_DEF_EEPROM_ADDR, |
0e8d1586 | 115 | CONFIG_ENV_OFFSET, |
0bc4a1ac | 116 | (uchar *)env_ptr, |
0e8d1586 | 117 | CONFIG_ENV_SIZE); |
0bc4a1ac WD |
118 | } |
119 | ||
120 | /************************************************************************ | |
121 | * Initialize Environment use | |
122 | * | |
123 | * We are still running from ROM, so data use is limited | |
124 | * Use a (moderately small) buffer on the stack | |
125 | */ | |
126 | int env_init(void) | |
127 | { | |
0bc4a1ac WD |
128 | ulong crc, len, new; |
129 | unsigned off; | |
130 | uchar buf[64]; | |
131 | ||
132 | eeprom_init (); /* prepare for EEPROM read/write */ | |
133 | ||
134 | /* read old CRC */ | |
548738b4 | 135 | eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR, |
0e8d1586 | 136 | CONFIG_ENV_OFFSET+offsetof(env_t,crc), |
0bc4a1ac WD |
137 | (uchar *)&crc, sizeof(ulong)); |
138 | ||
139 | new = 0; | |
140 | len = ENV_SIZE; | |
141 | off = offsetof(env_t,data); | |
142 | while (len > 0) { | |
143 | int n = (len > sizeof(buf)) ? sizeof(buf) : len; | |
144 | ||
548738b4 HS |
145 | eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR, |
146 | CONFIG_ENV_OFFSET + off, buf, n); | |
0bc4a1ac WD |
147 | new = crc32 (new, buf, n); |
148 | len -= n; | |
149 | off += n; | |
150 | } | |
151 | ||
152 | if (crc == new) { | |
153 | gd->env_addr = offsetof(env_t,data); | |
154 | gd->env_valid = 1; | |
155 | } else { | |
156 | gd->env_addr = 0; | |
157 | gd->env_valid = 0; | |
158 | } | |
159 | ||
160 | return (0); | |
161 | } |