projects / linux-2.6-block.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) | |
| 025ce02d PG |
7 | * |
| 8 | * License: GPL | |
| 1da177e4 LT |
9 | */ |
| 10 | ||
| 11 | /****************************************************************************/ | |
| 12 | ||
| 025ce02d | 13 | #include <linux/moduleparam.h> |
| 1da177e4 LT |
14 | #include <linux/types.h> |
| 15 | #include <linux/init.h> | |
| 16 | #include <linux/kernel.h> | |
| 17 | #include <linux/fs.h> | |
| 27ac792c | 18 | #include <linux/mm.h> |
| 1da177e4 | 19 | #include <linux/major.h> |
| 1da177e4 LT |
20 | #include <linux/mtd/mtd.h> |
| 21 | #include <linux/mtd/map.h> | |
| 22 | #include <linux/mtd/partitions.h> | |
| 23 | #include <asm/io.h> | |
| 363737d6 | 24 | #include <asm/sections.h> |
| 1da177e4 | 25 | |
| 1da177e4 LT |
26 | /****************************************************************************/ |
| 27 | ||
| 81f53ff8 UKK |
28 | #ifdef CONFIG_MTD_ROM |
| 29 | #define MAP_NAME "rom" | |
| 30 | #else | |
| 31 | #define MAP_NAME "ram" | |
| 32 | #endif | |
| 33 | ||
| 251f26c9 | 34 | static struct map_info uclinux_ram_map = { |
| 81f53ff8 | 35 | .name = MAP_NAME, |
| fa254ecb | 36 | .size = 0, |
| 1da177e4 LT |
37 | }; |
| 38 | ||
| 81f53ff8 UKK |
39 | static unsigned long physaddr = -1; |
| 40 | module_param(physaddr, ulong, S_IRUGO); | |
| 41 | ||
| 9f31f4b9 | 42 | static struct mtd_info *uclinux_ram_mtdinfo; |
| 1da177e4 LT |
43 | |
| 44 | /****************************************************************************/ | |
| 45 | ||
| d4906688 | 46 | static const struct mtd_partition uclinux_romfs[] = { |
| 1da177e4 LT |
47 | { .name = "ROMfs" } |
| 48 | }; | |
| 49 | ||
| 87d10f3c | 50 | #define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs) |
| 1da177e4 LT |
51 | |
| 52 | /****************************************************************************/ | |
| 53 | ||
| 9f31f4b9 | 54 | static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len, |
| a98889f3 | 55 | size_t *retlen, void **virt, resource_size_t *phys) |
| 1da177e4 LT |
56 | { |
| 57 | struct map_info *map = mtd->priv; | |
| a98889f3 JH |
58 | *virt = map->virt + from; |
| 59 | if (phys) | |
| 60 | *phys = map->phys + from; | |
| 1da177e4 LT |
61 | *retlen = len; |
| 62 | return(0); | |
| 63 | } | |
| 64 | ||
| 65 | /****************************************************************************/ | |
| 66 | ||
| 769455e2 | 67 | static int __init uclinux_mtd_init(void) |
| 1da177e4 LT |
68 | { |
| 69 | struct mtd_info *mtd; | |
| 70 | struct map_info *mapp; | |
| 1da177e4 LT |
71 | |
| 72 | mapp = &uclinux_ram_map; | |
| 81f53ff8 UKK |
73 | |
| 74 | if (physaddr == -1) | |
| 75 | mapp->phys = (resource_size_t)__bss_stop; | |
| 76 | else | |
| 77 | mapp->phys = physaddr; | |
| 78 | ||
| fa254ecb MF |
79 | if (!mapp->size) |
| 80 | mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8)))); | |
| 1da177e4 LT |
81 | mapp->bankwidth = 4; |
| 82 | ||
| 81f53ff8 | 83 | printk("uclinux[mtd]: probe address=0x%x size=0x%x\n", |
| f6515db4 | 84 | (int) mapp->phys, (int) mapp->size); |
| 1da177e4 | 85 | |
| 08a3c4bc GU |
86 | /* |
| 87 | * The filesystem is guaranteed to be in direct mapped memory. It is | |
| 88 | * directly following the kernels own bss region. Following the same | |
| 89 | * mechanism used by architectures setting up traditional initrds we | |
| 90 | * use phys_to_virt to get the virtual address of its start. | |
| 91 | */ | |
| 92 | mapp->virt = phys_to_virt(mapp->phys); | |
| 1da177e4 LT |
93 | |
| 94 | if (mapp->virt == 0) { | |
| 08a3c4bc | 95 | printk("uclinux[mtd]: no virtual mapping?\n"); |
| 1da177e4 LT |
96 | return(-EIO); |
| 97 | } | |
| 98 | ||
| 99 | simple_map_init(mapp); | |
| 100 | ||
| 81f53ff8 | 101 | mtd = do_map_probe("map_" MAP_NAME, mapp); |
| 1da177e4 LT |
102 | if (!mtd) { |
| 103 | printk("uclinux[mtd]: failed to find a mapping?\n"); | |
| 1da177e4 LT |
104 | return(-ENXIO); |
| 105 | } | |
| 69f34c98 | 106 | |
| 1da177e4 | 107 | mtd->owner = THIS_MODULE; |
| 3c3c10bb | 108 | mtd->_point = uclinux_point; |
| 1da177e4 LT |
109 | mtd->priv = mapp; |
| 110 | ||
| 111 | uclinux_ram_mtdinfo = mtd; | |
| 5e7e9686 | 112 | mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS); |
| 1da177e4 | 113 | |
| 1da177e4 LT |
114 | return(0); |
| 115 | } | |
| 025ce02d | 116 | device_initcall(uclinux_mtd_init); |
| 1da177e4 LT |
117 | |
| 118 | /****************************************************************************/ |