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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) | |
7 | * | |
69f34c98 | 8 | * $Id: uclinux.c,v 1.12 2005/11/07 11:14:29 gleixner Exp $ |
1da177e4 LT |
9 | */ |
10 | ||
11 | /****************************************************************************/ | |
12 | ||
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/types.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/fs.h> | |
18 | #include <linux/major.h> | |
1da177e4 LT |
19 | #include <linux/mtd/mtd.h> |
20 | #include <linux/mtd/map.h> | |
21 | #include <linux/mtd/partitions.h> | |
22 | #include <asm/io.h> | |
23 | ||
1da177e4 LT |
24 | /****************************************************************************/ |
25 | ||
26 | struct map_info uclinux_ram_map = { | |
27 | .name = "RAM", | |
28 | }; | |
29 | ||
30 | struct mtd_info *uclinux_ram_mtdinfo; | |
31 | ||
32 | /****************************************************************************/ | |
33 | ||
34 | struct mtd_partition uclinux_romfs[] = { | |
35 | { .name = "ROMfs" } | |
36 | }; | |
37 | ||
87d10f3c | 38 | #define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs) |
1da177e4 LT |
39 | |
40 | /****************************************************************************/ | |
41 | ||
42 | int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len, | |
43 | size_t *retlen, u_char **mtdbuf) | |
44 | { | |
45 | struct map_info *map = mtd->priv; | |
46 | *mtdbuf = (u_char *) (map->virt + ((int) from)); | |
47 | *retlen = len; | |
48 | return(0); | |
49 | } | |
50 | ||
51 | /****************************************************************************/ | |
52 | ||
53 | int __init uclinux_mtd_init(void) | |
54 | { | |
55 | struct mtd_info *mtd; | |
56 | struct map_info *mapp; | |
57 | extern char _ebss; | |
f6515db4 | 58 | unsigned long addr = (unsigned long) &_ebss; |
1da177e4 LT |
59 | |
60 | mapp = &uclinux_ram_map; | |
f6515db4 GU |
61 | mapp->phys = addr; |
62 | mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(addr + 8)))); | |
1da177e4 LT |
63 | mapp->bankwidth = 4; |
64 | ||
65 | printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n", | |
f6515db4 | 66 | (int) mapp->phys, (int) mapp->size); |
1da177e4 LT |
67 | |
68 | mapp->virt = ioremap_nocache(mapp->phys, mapp->size); | |
69 | ||
70 | if (mapp->virt == 0) { | |
71 | printk("uclinux[mtd]: ioremap_nocache() failed\n"); | |
72 | return(-EIO); | |
73 | } | |
74 | ||
75 | simple_map_init(mapp); | |
76 | ||
77 | mtd = do_map_probe("map_ram", mapp); | |
78 | if (!mtd) { | |
79 | printk("uclinux[mtd]: failed to find a mapping?\n"); | |
80 | iounmap(mapp->virt); | |
81 | return(-ENXIO); | |
82 | } | |
69f34c98 | 83 | |
1da177e4 LT |
84 | mtd->owner = THIS_MODULE; |
85 | mtd->point = uclinux_point; | |
86 | mtd->priv = mapp; | |
87 | ||
88 | uclinux_ram_mtdinfo = mtd; | |
89 | add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS); | |
90 | ||
1da177e4 LT |
91 | return(0); |
92 | } | |
93 | ||
94 | /****************************************************************************/ | |
95 | ||
96 | void __exit uclinux_mtd_cleanup(void) | |
97 | { | |
98 | if (uclinux_ram_mtdinfo) { | |
99 | del_mtd_partitions(uclinux_ram_mtdinfo); | |
100 | map_destroy(uclinux_ram_mtdinfo); | |
101 | uclinux_ram_mtdinfo = NULL; | |
102 | } | |
f6515db4 | 103 | if (uclinux_ram_map.virt) { |
1da177e4 LT |
104 | iounmap((void *) uclinux_ram_map.virt); |
105 | uclinux_ram_map.virt = 0; | |
106 | } | |
107 | } | |
108 | ||
109 | /****************************************************************************/ | |
110 | ||
111 | module_init(uclinux_mtd_init); | |
112 | module_exit(uclinux_mtd_cleanup); | |
113 | ||
114 | MODULE_LICENSE("GPL"); | |
115 | MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>"); | |
116 | MODULE_DESCRIPTION("Generic RAM based MTD for uClinux"); | |
117 | ||
118 | /****************************************************************************/ |