projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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> | |
| 363737d6 | 22 | #include <asm/sections.h> |
| 1da177e4 | 23 | |
| 1da177e4 LT |
24 | /****************************************************************************/ |
| 25 | ||
| 26 | struct map_info uclinux_ram_map = { | |
| 27 | .name = "RAM", | |
| 363737d6 | 28 | .phys = (unsigned long)__bss_stop, |
| fa254ecb | 29 | .size = 0, |
| 1da177e4 LT |
30 | }; |
| 31 | ||
| 9f31f4b9 | 32 | static struct mtd_info *uclinux_ram_mtdinfo; |
| 1da177e4 LT |
33 | |
| 34 | /****************************************************************************/ | |
| 35 | ||
| 9f31f4b9 | 36 | static struct mtd_partition uclinux_romfs[] = { |
| 1da177e4 LT |
37 | { .name = "ROMfs" } |
| 38 | }; | |
| 39 | ||
| 87d10f3c | 40 | #define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs) |
| 1da177e4 LT |
41 | |
| 42 | /****************************************************************************/ | |
| 43 | ||
| 9f31f4b9 | 44 | static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len, |
| a98889f3 | 45 | size_t *retlen, void **virt, resource_size_t *phys) |
| 1da177e4 LT |
46 | { |
| 47 | struct map_info *map = mtd->priv; | |
| a98889f3 JH |
48 | *virt = map->virt + from; |
| 49 | if (phys) | |
| 50 | *phys = map->phys + from; | |
| 1da177e4 LT |
51 | *retlen = len; |
| 52 | return(0); | |
| 53 | } | |
| 54 | ||
| 55 | /****************************************************************************/ | |
| 56 | ||
| 769455e2 | 57 | static int __init uclinux_mtd_init(void) |
| 1da177e4 LT |
58 | { |
| 59 | struct mtd_info *mtd; | |
| 60 | struct map_info *mapp; | |
| 1da177e4 LT |
61 | |
| 62 | mapp = &uclinux_ram_map; | |
| fa254ecb MF |
63 | if (!mapp->size) |
| 64 | mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8)))); | |
| 1da177e4 LT |
65 | mapp->bankwidth = 4; |
| 66 | ||
| 67 | printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n", | |
| f6515db4 | 68 | (int) mapp->phys, (int) mapp->size); |
| 1da177e4 | 69 | |
| 08a3c4bc GU |
70 | /* |
| 71 | * The filesystem is guaranteed to be in direct mapped memory. It is | |
| 72 | * directly following the kernels own bss region. Following the same | |
| 73 | * mechanism used by architectures setting up traditional initrds we | |
| 74 | * use phys_to_virt to get the virtual address of its start. | |
| 75 | */ | |
| 76 | mapp->virt = phys_to_virt(mapp->phys); | |
| 1da177e4 LT |
77 | |
| 78 | if (mapp->virt == 0) { | |
| 08a3c4bc | 79 | printk("uclinux[mtd]: no virtual mapping?\n"); |
| 1da177e4 LT |
80 | return(-EIO); |
| 81 | } | |
| 82 | ||
| 83 | simple_map_init(mapp); | |
| 84 | ||
| 85 | mtd = do_map_probe("map_ram", mapp); | |
| 86 | if (!mtd) { | |
| 87 | printk("uclinux[mtd]: failed to find a mapping?\n"); | |
| 1da177e4 LT |
88 | return(-ENXIO); |
| 89 | } | |
| 69f34c98 | 90 | |
| 1da177e4 | 91 | mtd->owner = THIS_MODULE; |
| 3c3c10bb | 92 | mtd->_point = uclinux_point; |
| 1da177e4 LT |
93 | mtd->priv = mapp; |
| 94 | ||
| 95 | uclinux_ram_mtdinfo = mtd; | |
| 5e7e9686 | 96 | mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS); |
| 1da177e4 | 97 | |
| 1da177e4 LT |
98 | return(0); |
| 99 | } | |
| 100 | ||
| 101 | /****************************************************************************/ | |
| 102 | ||
| 769455e2 | 103 | static void __exit uclinux_mtd_cleanup(void) |
| 1da177e4 LT |
104 | { |
| 105 | if (uclinux_ram_mtdinfo) { | |
| 5e7e9686 | 106 | mtd_device_unregister(uclinux_ram_mtdinfo); |
| 1da177e4 LT |
107 | map_destroy(uclinux_ram_mtdinfo); |
| 108 | uclinux_ram_mtdinfo = NULL; | |
| 109 | } | |
| 08a3c4bc | 110 | if (uclinux_ram_map.virt) |
| 1da177e4 | 111 | uclinux_ram_map.virt = 0; |
| 1da177e4 LT |
112 | } |
| 113 | ||
| 114 | /****************************************************************************/ | |
| 115 | ||
| 116 | module_init(uclinux_mtd_init); | |
| 117 | module_exit(uclinux_mtd_cleanup); | |
| 118 | ||
| 119 | MODULE_LICENSE("GPL"); | |
| 120 | MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>"); | |
| 121 | MODULE_DESCRIPTION("Generic RAM based MTD for uClinux"); | |
| 122 | ||
| 123 | /****************************************************************************/ |