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wdenkc6097192002-11-03 00:24:07 +00001/*
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
38 * #define CFG_NVRAM_ACCESS_ROUTINE. Note, that those functions are
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>
44
45#ifdef CFG_ENV_IS_IN_NVRAM /* Environment is in NVRAM */
46
47#include <command.h>
48#include <environment.h>
wdenkc6097192002-11-03 00:24:07 +000049#include <linux/stddef.h>
50#include <malloc.h>
51
52#ifdef CFG_NVRAM_ACCESS_ROUTINE
53extern void *nvram_read(void *dest, const long src, size_t count);
54extern void nvram_write(long dest, const void *src, size_t count);
55env_t *env_ptr = NULL;
56#else
57env_t *env_ptr = (env_t *)CFG_ENV_ADDR;
58#endif
59
60char * env_name_spec = "NVRAM";
61
62extern uchar default_environment[];
63extern int default_environment_size;
64
65extern uchar (*env_get_char)(int);
66extern uchar env_get_char_memory (int index);
67
wdenk7c7a23b2002-12-07 00:20:59 +000068#ifdef CONFIG_AMIGAONEG3SE
69uchar env_get_char_spec (int index)
70{
71#ifdef CFG_NVRAM_ACCESS_ROUTINE
72 uchar c;
wdenkc6097192002-11-03 00:24:07 +000073
wdenk7c7a23b2002-12-07 00:20:59 +000074 nvram_read(&c, CFG_ENV_ADDR+index, 1);
75
76 return c;
77#else
78 DECLARE_GLOBAL_DATA_PTR;
79 uchar retval;
80 enable_nvram();
81 retval = *((uchar *)(gd->env_addr + index));
82 disable_nvram();
83 return retval;
84#endif
85}
86#else
wdenkc6097192002-11-03 00:24:07 +000087uchar env_get_char_spec (int index)
88{
89#ifdef CFG_NVRAM_ACCESS_ROUTINE
90 uchar c;
91
92 nvram_read(&c, CFG_ENV_ADDR+index, 1);
93
94 return c;
95#else
96 DECLARE_GLOBAL_DATA_PTR;
97
98 return *((uchar *)(gd->env_addr + index));
99#endif
100}
wdenk7c7a23b2002-12-07 00:20:59 +0000101#endif
wdenkc6097192002-11-03 00:24:07 +0000102
103void env_relocate_spec (void)
104{
105#if defined(CFG_NVRAM_ACCESS_ROUTINE)
106 nvram_read(env_ptr, CFG_ENV_ADDR, CFG_ENV_SIZE);
107#else
108 memcpy (env_ptr, (void*)CFG_ENV_ADDR, CFG_ENV_SIZE);
109#endif
110}
111
112int saveenv (void)
113{
114 int rcode = 0;
wdenk7c7a23b2002-12-07 00:20:59 +0000115#ifdef CONFIG_AMIGAONEG3SE
116 enable_nvram();
117#endif
wdenkc6097192002-11-03 00:24:07 +0000118#ifdef CFG_NVRAM_ACCESS_ROUTINE
119 nvram_write(CFG_ENV_ADDR, env_ptr, CFG_ENV_SIZE);
120#else
121 if (memcpy ((char *)CFG_ENV_ADDR, env_ptr, CFG_ENV_SIZE) == NULL)
122 rcode = 1 ;
123#endif
wdenk7c7a23b2002-12-07 00:20:59 +0000124#ifdef CONFIG_AMIGAONEG3SE
125 udelay(10000);
126 disable_nvram();
127#endif
wdenkc6097192002-11-03 00:24:07 +0000128 return rcode;
129}
130
131
132/************************************************************************
133 * Initialize Environment use
134 *
135 * We are still running from ROM, so data use is limited
136 */
137int env_init (void)
138{
139 DECLARE_GLOBAL_DATA_PTR;
wdenk7c7a23b2002-12-07 00:20:59 +0000140#ifdef CONFIG_AMIGAONEG3SE
141 enable_nvram();
142#endif
wdenkc6097192002-11-03 00:24:07 +0000143#if defined(CFG_NVRAM_ACCESS_ROUTINE)
144 ulong crc;
145 uchar data[ENV_SIZE];
146 nvram_read (&crc, CFG_ENV_ADDR, sizeof(ulong));
147 nvram_read (data, CFG_ENV_ADDR+sizeof(ulong), ENV_SIZE);
148
149 if (crc32(0, data, ENV_SIZE) == crc) {
150 gd->env_addr = (ulong)CFG_ENV_ADDR + sizeof(long);
151#else
152 if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
153 gd->env_addr = (ulong)&(env_ptr->data);
154#endif
155 gd->env_valid = 1;
156 } else {
157 gd->env_addr = (ulong)&default_environment[0];
158 gd->env_valid = 0;
159 }
wdenk7c7a23b2002-12-07 00:20:59 +0000160#ifdef CONFIG_AMIGAONEG3SE
161 disable_nvram();
162#endif
wdenkc6097192002-11-03 00:24:07 +0000163 return (0);
164}
165
166#endif /* CFG_ENV_IS_IN_NVRAM */