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Wolfgang Denkea882ba2010-06-20 23:33:59 +02001/*
2 * LowLevel function for DataFlash environment support
wdenk5779d8d2003-12-06 23:55:10 +00003 * Author : Gilles Gastaldi (Atmel)
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of
8 * the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
18 * MA 02111-1307 USA
wdenk5779d8d2003-12-06 23:55:10 +000019 */
20#include <common.h>
wdenk5779d8d2003-12-06 23:55:10 +000021#include <command.h>
22#include <environment.h>
23#include <linux/stddef.h>
wdenk5779d8d2003-12-06 23:55:10 +000024#include <dataflash.h>
Wolfgang Denkea882ba2010-06-20 23:33:59 +020025#include <search.h>
26#include <errno.h>
wdenk5779d8d2003-12-06 23:55:10 +000027
Wolfgang Denkd87080b2006-03-31 18:32:53 +020028DECLARE_GLOBAL_DATA_PTR;
29
wdenk5779d8d2003-12-06 23:55:10 +000030env_t *env_ptr = NULL;
31
32char * env_name_spec = "dataflash";
33
Wolfgang Denkea882ba2010-06-20 23:33:59 +020034extern int read_dataflash(unsigned long addr, unsigned long size,
35 char *result);
36extern int write_dataflash(unsigned long addr_dest,
37 unsigned long addr_src, unsigned long size);
38extern int AT91F_DataflashInit(void);
39
wdenk5779d8d2003-12-06 23:55:10 +000040extern uchar default_environment[];
wdenk5779d8d2003-12-06 23:55:10 +000041
Wolfgang Denkea882ba2010-06-20 23:33:59 +020042uchar env_get_char_spec(int index)
wdenk5779d8d2003-12-06 23:55:10 +000043{
44 uchar c;
Wolfgang Denkea882ba2010-06-20 23:33:59 +020045
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +020046 read_dataflash(CONFIG_ENV_ADDR + index + offsetof(env_t,data),
Wolfgang Denkea882ba2010-06-20 23:33:59 +020047 1, (char *)&c);
wdenk5779d8d2003-12-06 23:55:10 +000048 return (c);
49}
50
Wolfgang Denkea882ba2010-06-20 23:33:59 +020051void env_relocate_spec(void)
wdenk5779d8d2003-12-06 23:55:10 +000052{
Wolfgang Denkea882ba2010-06-20 23:33:59 +020053 char buf[CONFIG_ENV_SIZE];
54
55 read_dataflash(CONFIG_ENV_ADDR, CONFIG_ENV_SIZE, buf);
56
57 env_import(buf, 1);
wdenk5779d8d2003-12-06 23:55:10 +000058}
59
Wolfgang Denkea882ba2010-06-20 23:33:59 +020060#ifdef CONFIG_ENV_OFFSET_REDUND
61#error No support for redundant environment on dataflash yet!
62#endif
63
wdenk5779d8d2003-12-06 23:55:10 +000064int saveenv(void)
65{
Wolfgang Denkea882ba2010-06-20 23:33:59 +020066 env_t env_new;
67 ssize_t len;
68 char *res;
69
70 res = (char *)&env_new.data;
71 len = hexport('\0', &res, ENV_SIZE);
72 if (len < 0) {
73 error("Cannot export environment: errno = %d\n", errno);
74 return 1;
75 }
76 env_new.crc = crc32(0, env_new.data, ENV_SIZE);
77
78 return write_dataflash(CONFIG_ENV_ADDR,
79 (unsigned long)&env_new,
80 CONFIG_ENV_SIZE);
wdenk5779d8d2003-12-06 23:55:10 +000081}
82
Wolfgang Denkea882ba2010-06-20 23:33:59 +020083/*
84 * Initialize environment use
wdenk5779d8d2003-12-06 23:55:10 +000085 *
Wolfgang Denkea882ba2010-06-20 23:33:59 +020086 * We are still running from ROM, so data use is limited.
wdenk5779d8d2003-12-06 23:55:10 +000087 * Use a (moderately small) buffer on the stack
88 */
89int env_init(void)
90{
wdenk5779d8d2003-12-06 23:55:10 +000091 ulong crc, len, new;
92 unsigned off;
93 uchar buf[64];
wdenk5779d8d2003-12-06 23:55:10 +000094
Wolfgang Denkea882ba2010-06-20 23:33:59 +020095 if (gd->env_valid)
96 return 0;
97
98 AT91F_DataflashInit(); /* prepare for DATAFLASH read/write */
99
100 /* read old CRC */
101 read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
102 sizeof(ulong), (char *)&crc);
103
104 new = 0;
105 len = ENV_SIZE;
106 off = offsetof(env_t,data);
107 while (len > 0) {
108 int n = (len > sizeof(buf)) ? sizeof(buf) : len;
109
110 read_dataflash(CONFIG_ENV_ADDR + off, n, (char *)buf);
111
112 new = crc32 (new, buf, n);
113 len -= n;
114 off += n;
wdenk5779d8d2003-12-06 23:55:10 +0000115 }
116
Wolfgang Denkea882ba2010-06-20 23:33:59 +0200117 if (crc == new) {
118 gd->env_addr = offsetof(env_t,data);
119 gd->env_valid = 1;
120 } else {
121 gd->env_addr = (ulong)&default_environment[0];
122 gd->env_valid = 0;
123 }
124
125 return 0;
wdenk5779d8d2003-12-06 23:55:10 +0000126}