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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 | * | |
8 | * $Id: uclinux.c,v 1.10 2005/01/05 18:05:13 dwmw2 Exp $ | |
9 | */ | |
10 | ||
11 | /****************************************************************************/ | |
12 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/major.h> | |
20 | #include <linux/root_dev.h> | |
21 | #include <linux/mtd/mtd.h> | |
22 | #include <linux/mtd/map.h> | |
23 | #include <linux/mtd/partitions.h> | |
24 | #include <asm/io.h> | |
25 | ||
26 | /****************************************************************************/ | |
27 | ||
28 | ||
29 | /****************************************************************************/ | |
30 | ||
31 | struct map_info uclinux_ram_map = { | |
32 | .name = "RAM", | |
33 | }; | |
34 | ||
35 | struct mtd_info *uclinux_ram_mtdinfo; | |
36 | ||
37 | /****************************************************************************/ | |
38 | ||
39 | struct mtd_partition uclinux_romfs[] = { | |
40 | { .name = "ROMfs" } | |
41 | }; | |
42 | ||
43 | #define NUM_PARTITIONS (sizeof(uclinux_romfs) / sizeof(uclinux_romfs[0])) | |
44 | ||
45 | /****************************************************************************/ | |
46 | ||
47 | int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len, | |
48 | size_t *retlen, u_char **mtdbuf) | |
49 | { | |
50 | struct map_info *map = mtd->priv; | |
51 | *mtdbuf = (u_char *) (map->virt + ((int) from)); | |
52 | *retlen = len; | |
53 | return(0); | |
54 | } | |
55 | ||
56 | /****************************************************************************/ | |
57 | ||
58 | int __init uclinux_mtd_init(void) | |
59 | { | |
60 | struct mtd_info *mtd; | |
61 | struct map_info *mapp; | |
62 | extern char _ebss; | |
63 | ||
64 | mapp = &uclinux_ram_map; | |
65 | mapp->phys = (unsigned long) &_ebss; | |
66 | mapp->size = PAGE_ALIGN(*((unsigned long *)((&_ebss) + 8))); | |
67 | mapp->bankwidth = 4; | |
68 | ||
69 | printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n", | |
70 | (int) mapp->map_priv_2, (int) mapp->size); | |
71 | ||
72 | mapp->virt = ioremap_nocache(mapp->phys, mapp->size); | |
73 | ||
74 | if (mapp->virt == 0) { | |
75 | printk("uclinux[mtd]: ioremap_nocache() failed\n"); | |
76 | return(-EIO); | |
77 | } | |
78 | ||
79 | simple_map_init(mapp); | |
80 | ||
81 | mtd = do_map_probe("map_ram", mapp); | |
82 | if (!mtd) { | |
83 | printk("uclinux[mtd]: failed to find a mapping?\n"); | |
84 | iounmap(mapp->virt); | |
85 | return(-ENXIO); | |
86 | } | |
87 | ||
88 | mtd->owner = THIS_MODULE; | |
89 | mtd->point = uclinux_point; | |
90 | mtd->priv = mapp; | |
91 | ||
92 | uclinux_ram_mtdinfo = mtd; | |
93 | add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS); | |
94 | ||
95 | printk("uclinux[mtd]: set %s to be root filesystem\n", | |
96 | uclinux_romfs[0].name); | |
97 | ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, 0); | |
98 | put_mtd_device(mtd); | |
99 | ||
100 | return(0); | |
101 | } | |
102 | ||
103 | /****************************************************************************/ | |
104 | ||
105 | void __exit uclinux_mtd_cleanup(void) | |
106 | { | |
107 | if (uclinux_ram_mtdinfo) { | |
108 | del_mtd_partitions(uclinux_ram_mtdinfo); | |
109 | map_destroy(uclinux_ram_mtdinfo); | |
110 | uclinux_ram_mtdinfo = NULL; | |
111 | } | |
112 | if (uclinux_ram_map.map_priv_1) { | |
113 | iounmap((void *) uclinux_ram_map.virt); | |
114 | uclinux_ram_map.virt = 0; | |
115 | } | |
116 | } | |
117 | ||
118 | /****************************************************************************/ | |
119 | ||
120 | module_init(uclinux_mtd_init); | |
121 | module_exit(uclinux_mtd_cleanup); | |
122 | ||
123 | MODULE_LICENSE("GPL"); | |
124 | MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>"); | |
125 | MODULE_DESCRIPTION("Generic RAM based MTD for uClinux"); | |
126 | ||
127 | /****************************************************************************/ |