Commit | Line | Data |
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1da177e4 LT |
1 | /****************************************************************************/ |
2 | ||
3 | /* | |
4 | * uclinux.c -- generic memory mapped MTD driver for uclinux | |
5 | * | |
6 | * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com) | |
1da177e4 LT |
7 | */ |
8 | ||
9 | /****************************************************************************/ | |
10 | ||
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/types.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/fs.h> | |
27ac792c | 16 | #include <linux/mm.h> |
1da177e4 | 17 | #include <linux/major.h> |
1da177e4 LT |
18 | #include <linux/mtd/mtd.h> |
19 | #include <linux/mtd/map.h> | |
20 | #include <linux/mtd/partitions.h> | |
21 | #include <asm/io.h> | |
22 | ||
1da177e4 LT |
23 | /****************************************************************************/ |
24 | ||
25 | struct map_info uclinux_ram_map = { | |
26 | .name = "RAM", | |
27 | }; | |
28 | ||
29 | struct mtd_info *uclinux_ram_mtdinfo; | |
30 | ||
31 | /****************************************************************************/ | |
32 | ||
33 | struct mtd_partition uclinux_romfs[] = { | |
34 | { .name = "ROMfs" } | |
35 | }; | |
36 | ||
87d10f3c | 37 | #define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs) |
1da177e4 LT |
38 | |
39 | /****************************************************************************/ | |
40 | ||
41 | int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len, | |
a98889f3 | 42 | size_t *retlen, void **virt, resource_size_t *phys) |
1da177e4 LT |
43 | { |
44 | struct map_info *map = mtd->priv; | |
a98889f3 JH |
45 | *virt = map->virt + from; |
46 | if (phys) | |
47 | *phys = map->phys + from; | |
1da177e4 LT |
48 | *retlen = len; |
49 | return(0); | |
50 | } | |
51 | ||
52 | /****************************************************************************/ | |
53 | ||
54 | int __init uclinux_mtd_init(void) | |
55 | { | |
56 | struct mtd_info *mtd; | |
57 | struct map_info *mapp; | |
58 | extern char _ebss; | |
f6515db4 | 59 | unsigned long addr = (unsigned long) &_ebss; |
1da177e4 LT |
60 | |
61 | mapp = &uclinux_ram_map; | |
f6515db4 GU |
62 | mapp->phys = addr; |
63 | mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(addr + 8)))); | |
1da177e4 LT |
64 | mapp->bankwidth = 4; |
65 | ||
66 | printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n", | |
f6515db4 | 67 | (int) mapp->phys, (int) mapp->size); |
1da177e4 LT |
68 | |
69 | mapp->virt = ioremap_nocache(mapp->phys, mapp->size); | |
70 | ||
71 | if (mapp->virt == 0) { | |
72 | printk("uclinux[mtd]: ioremap_nocache() failed\n"); | |
73 | return(-EIO); | |
74 | } | |
75 | ||
76 | simple_map_init(mapp); | |
77 | ||
78 | mtd = do_map_probe("map_ram", mapp); | |
79 | if (!mtd) { | |
80 | printk("uclinux[mtd]: failed to find a mapping?\n"); | |
81 | iounmap(mapp->virt); | |
82 | return(-ENXIO); | |
83 | } | |
69f34c98 | 84 | |
1da177e4 LT |
85 | mtd->owner = THIS_MODULE; |
86 | mtd->point = uclinux_point; | |
87 | mtd->priv = mapp; | |
88 | ||
89 | uclinux_ram_mtdinfo = mtd; | |
90 | add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS); | |
91 | ||
1da177e4 LT |
92 | return(0); |
93 | } | |
94 | ||
95 | /****************************************************************************/ | |
96 | ||
97 | void __exit uclinux_mtd_cleanup(void) | |
98 | { | |
99 | if (uclinux_ram_mtdinfo) { | |
100 | del_mtd_partitions(uclinux_ram_mtdinfo); | |
101 | map_destroy(uclinux_ram_mtdinfo); | |
102 | uclinux_ram_mtdinfo = NULL; | |
103 | } | |
f6515db4 | 104 | if (uclinux_ram_map.virt) { |
1da177e4 LT |
105 | iounmap((void *) uclinux_ram_map.virt); |
106 | uclinux_ram_map.virt = 0; | |
107 | } | |
108 | } | |
109 | ||
110 | /****************************************************************************/ | |
111 | ||
112 | module_init(uclinux_mtd_init); | |
113 | module_exit(uclinux_mtd_cleanup); | |
114 | ||
115 | MODULE_LICENSE("GPL"); | |
116 | MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>"); | |
117 | MODULE_DESCRIPTION("Generic RAM based MTD for uClinux"); | |
118 | ||
119 | /****************************************************************************/ |