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
|
/*
* NOR Flash memory access on TI Toto board
*
* jzhang@ti.com (C) 2003 Texas Instruments.
*
* (C) 2002 MontVista Software, Inc.
*
* $Id: omap-toto-flash.c,v 1.5 2005/11/07 11:14:27 gleixner Exp $
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <asm/hardware.h>
#include <asm/io.h>
#ifndef CONFIG_ARCH_OMAP
#error This is for OMAP architecture only
#endif
//these lines need be moved to a hardware header file
#define OMAP_TOTO_FLASH_BASE 0xd8000000
#define OMAP_TOTO_FLASH_SIZE 0x80000
static struct map_info omap_toto_map_flash = {
.name = "OMAP Toto flash",
.bankwidth = 2,
.virt = (void __iomem *)OMAP_TOTO_FLASH_BASE,
};
static struct mtd_partition toto_flash_partitions[] = {
{
.name = "BootLoader",
.size = 0x00040000, /* hopefully u-boot will stay 128k + 128*/
.offset = 0,
.mask_flags = MTD_WRITEABLE, /* force read-only */
}, {
.name = "ReservedSpace",
.size = 0x00030000,
.offset = MTDPART_OFS_APPEND,
//mask_flags: MTD_WRITEABLE, /* force read-only */
}, {
.name = "EnvArea", /* bottom 64KiB for env vars */
.size = MTDPART_SIZ_FULL,
.offset = MTDPART_OFS_APPEND,
}
};
static struct mtd_partition *parsed_parts;
static struct mtd_info *flash_mtd;
static int __init init_flash (void)
{
struct mtd_partition *parts;
int nb_parts = 0;
int parsed_nr_parts = 0;
const char *part_type;
/*
* Static partition definition selection
*/
part_type = "static";
parts = toto_flash_partitions;
nb_parts = ARRAY_SIZE(toto_flash_partitions);
omap_toto_map_flash.size = OMAP_TOTO_FLASH_SIZE;
omap_toto_map_flash.phys = virt_to_phys(OMAP_TOTO_FLASH_BASE);
simple_map_init(&omap_toto_map_flash);
/*
* Now let's probe for the actual flash. Do it here since
* specific machine settings might have been set above.
*/
printk(KERN_NOTICE "OMAP toto flash: probing %d-bit flash bus\n",
omap_toto_map_flash.bankwidth*8);
flash_mtd = do_map_probe("jedec_probe", &omap_toto_map_flash);
if (!flash_mtd)
return -ENXIO;
if (parsed_nr_parts > 0) {
parts = parsed_parts;
nb_parts = parsed_nr_parts;
}
if (nb_parts == 0) {
printk(KERN_NOTICE "OMAP toto flash: no partition info available,"
"registering whole flash at once\n");
if (add_mtd_device(flash_mtd)){
return -ENXIO;
}
} else {
printk(KERN_NOTICE "Using %s partition definition\n",
part_type);
return add_mtd_partitions(flash_mtd, parts, nb_parts);
}
return 0;
}
int __init omap_toto_mtd_init(void)
{
int status;
if (status = init_flash()) {
printk(KERN_ERR "OMAP Toto Flash: unable to init map for toto flash\n");
}
return status;
}
static void __exit omap_toto_mtd_cleanup(void)
{
if (flash_mtd) {
del_mtd_partitions(flash_mtd);
map_destroy(flash_mtd);
if (parsed_parts)
kfree(parsed_parts);
}
}
module_init(omap_toto_mtd_init);
module_exit(omap_toto_mtd_cleanup);
MODULE_AUTHOR("Jian Zhang");
MODULE_DESCRIPTION("OMAP Toto board map driver");
MODULE_LICENSE("GPL");
|
