1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/*
* Copyright © 2001 Flaga hf. Medical Devices, Kári Davíđsson <kd@flaga.is>
*
* $Id: cfi_flagadm.c,v 1.7 2001/10/02 15:05:13 dwmw2 Exp $
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
/* We split the flash chip up into four parts.
* 1: bootloader firts 128k (0x00000000 - 0x0001FFFF) size 0x020000
* 2: kernel 640k (0x00020000 - 0x000BFFFF) size 0x0A0000
* 3: compressed 1536k root ramdisk (0x000C0000 - 0x0023FFFF) size 0x180000
* 4: writeable diskpartition (jffs)(0x00240000 - 0x003FFFFF) size 0x1C0000
*/
#define FLASH_PHYS_ADDR 0x40000000
#define FLASH_SIZE 0x400000
#define FLASH_PARTITION0_ADDR 0x00000000
#define FLASH_PARTITION0_SIZE 0x00020000
#define FLASH_PARTITION1_ADDR 0x00020000
#define FLASH_PARTITION1_SIZE 0x000A0000
#define FLASH_PARTITION2_ADDR 0x000C0000
#define FLASH_PARTITION2_SIZE 0x00180000
#define FLASH_PARTITION3_ADDR 0x00240000
#define FLASH_PARTITION3_SIZE 0x001C0000
__u8 flagadm_read8(struct map_info *map, unsigned long ofs)
{
return __raw_readb(map->map_priv_1 + ofs);
}
__u16 flagadm_read16(struct map_info *map, unsigned long ofs)
{
return __raw_readw(map->map_priv_1 + ofs);
}
__u32 flagadm_read32(struct map_info *map, unsigned long ofs)
{
return __raw_readl(map->map_priv_1 + ofs);
}
void flagadm_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
memcpy_fromio(to, map->map_priv_1 + from, len);
}
void flagadm_write8(struct map_info *map, __u8 d, unsigned long adr)
{
__raw_writeb(d, map->map_priv_1 + adr);
mb();
}
void flagadm_write16(struct map_info *map, __u16 d, unsigned long adr)
{
__raw_writew(d, map->map_priv_1 + adr);
mb();
}
void flagadm_write32(struct map_info *map, __u32 d, unsigned long adr)
{
__raw_writel(d, map->map_priv_1 + adr);
mb();
}
void flagadm_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{
memcpy_toio(map->map_priv_1 + to, from, len);
}
struct map_info flagadm_map = {
name: "FlagaDM flash device",
size: FLASH_SIZE,
buswidth: 2,
read8: flagadm_read8,
read16: flagadm_read16,
read32: flagadm_read32,
copy_from: flagadm_copy_from,
write8: flagadm_write8,
write16: flagadm_write16,
write32: flagadm_write32,
copy_to: flagadm_copy_to
};
struct mtd_partition flagadm_parts[] = {
{
name : "Bootloader",
offset : FLASH_PARTITION0_ADDR,
size : FLASH_PARTITION0_SIZE
},
{
name : "Kernel image",
offset : FLASH_PARTITION1_ADDR,
size : FLASH_PARTITION1_SIZE
},
{
name : "Initial ramdisk image",
offset : FLASH_PARTITION2_ADDR,
size : FLASH_PARTITION2_SIZE
},
{
name : "Persistant storage",
offset : FLASH_PARTITION3_ADDR,
size : FLASH_PARTITION3_SIZE
}
};
#define PARTITION_COUNT (sizeof(flagadm_parts)/sizeof(struct mtd_partition))
static struct mtd_info *mymtd;
int __init init_flagadm(void)
{
printk(KERN_NOTICE "FlagaDM flash device: %x at %x\n",
FLASH_SIZE, FLASH_PHYS_ADDR);
flagadm_map.map_priv_1 = (unsigned long)ioremap(FLASH_PHYS_ADDR,
FLASH_SIZE);
if (!flagadm_map.map_priv_1) {
printk("Failed to ioremap\n");
return -EIO;
}
mymtd = do_map_probe("cfi_probe", &flagadm_map);
if (mymtd) {
mymtd->module = THIS_MODULE;
add_mtd_partitions(mymtd, flagadm_parts, PARTITION_COUNT);
printk(KERN_NOTICE "FlagaDM flash device initialized\n");
return 0;
}
iounmap((void *)flagadm_map.map_priv_1);
return -ENXIO;
}
static void __exit cleanup_flagadm(void)
{
if (mymtd) {
del_mtd_partitions(mymtd);
map_destroy(mymtd);
}
if (flagadm_map.map_priv_1) {
iounmap((void *)flagadm_map.map_priv_1);
flagadm_map.map_priv_1 = 0;
}
}
module_init(init_flagadm);
module_exit(cleanup_flagadm);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Kári Davíđsson <kd@flaga.is>");
MODULE_DESCRIPTION("MTD map driver for Flaga digital module");
|
