projects / mirror_ubuntu-jammy-kernel.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> | |
| 22 | ||
| 1da177e4 LT |
23 | /****************************************************************************/ |
| 24 | ||
| fa254ecb MF |
25 | extern char _ebss; |
| 26 | ||
| 1da177e4 LT |
27 | struct map_info uclinux_ram_map = { |
| 28 | .name = "RAM", | |
| fa254ecb MF |
29 | .phys = (unsigned long)&_ebss, |
| 30 | .size = 0, | |
| 1da177e4 LT |
31 | }; |
| 32 | ||
| 33 | struct mtd_info *uclinux_ram_mtdinfo; | |
| 34 | ||
| 35 | /****************************************************************************/ | |
| 36 | ||
| 37 | struct mtd_partition uclinux_romfs[] = { | |
| 38 | { .name = "ROMfs" } | |
| 39 | }; | |
| 40 | ||
| 87d10f3c | 41 | #define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs) |
| 1da177e4 LT |
42 | |
| 43 | /****************************************************************************/ | |
| 44 | ||
| 45 | int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len, | |
| a98889f3 | 46 | size_t *retlen, void **virt, resource_size_t *phys) |
| 1da177e4 LT |
47 | { |
| 48 | struct map_info *map = mtd->priv; | |
| a98889f3 JH |
49 | *virt = map->virt + from; |
| 50 | if (phys) | |
| 51 | *phys = map->phys + from; | |
| 1da177e4 LT |
52 | *retlen = len; |
| 53 | return(0); | |
| 54 | } | |
| 55 | ||
| 56 | /****************************************************************************/ | |
| 57 | ||
| 769455e2 | 58 | static int __init uclinux_mtd_init(void) |
| 1da177e4 LT |
59 | { |
| 60 | struct mtd_info *mtd; | |
| 61 | struct map_info *mapp; | |
| 1da177e4 LT |
62 | |
| 63 | mapp = &uclinux_ram_map; | |
| fa254ecb MF |
64 | if (!mapp->size) |
| 65 | mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8)))); | |
| 1da177e4 LT |
66 | mapp->bankwidth = 4; |
| 67 | ||
| 68 | printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n", | |
| f6515db4 | 69 | (int) mapp->phys, (int) mapp->size); |
| 1da177e4 LT |
70 | |
| 71 | mapp->virt = ioremap_nocache(mapp->phys, mapp->size); | |
| 72 | ||
| 73 | if (mapp->virt == 0) { | |
| 74 | printk("uclinux[mtd]: ioremap_nocache() failed\n"); | |
| 75 | return(-EIO); | |
| 76 | } | |
| 77 | ||
| 78 | simple_map_init(mapp); | |
| 79 | ||
| 80 | mtd = do_map_probe("map_ram", mapp); | |
| 81 | if (!mtd) { | |
| 82 | printk("uclinux[mtd]: failed to find a mapping?\n"); | |
| 83 | iounmap(mapp->virt); | |
| 84 | return(-ENXIO); | |
| 85 | } | |
| 69f34c98 | 86 | |
| 1da177e4 LT |
87 | mtd->owner = THIS_MODULE; |
| 88 | mtd->point = uclinux_point; | |
| 89 | mtd->priv = mapp; | |
| 90 | ||
| 91 | uclinux_ram_mtdinfo = mtd; | |
| 92 | add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS); | |
| 93 | ||
| 1da177e4 LT |
94 | return(0); |
| 95 | } | |
| 96 | ||
| 97 | /****************************************************************************/ | |
| 98 | ||
| 769455e2 | 99 | static void __exit uclinux_mtd_cleanup(void) |
| 1da177e4 LT |
100 | { |
| 101 | if (uclinux_ram_mtdinfo) { | |
| 102 | del_mtd_partitions(uclinux_ram_mtdinfo); | |
| 103 | map_destroy(uclinux_ram_mtdinfo); | |
| 104 | uclinux_ram_mtdinfo = NULL; | |
| 105 | } | |
| f6515db4 | 106 | if (uclinux_ram_map.virt) { |
| 1da177e4 LT |
107 | iounmap((void *) uclinux_ram_map.virt); |
| 108 | uclinux_ram_map.virt = 0; | |
| 109 | } | |
| 110 | } | |
| 111 | ||
| 112 | /****************************************************************************/ | |
| 113 | ||
| 114 | module_init(uclinux_mtd_init); | |
| 115 | module_exit(uclinux_mtd_cleanup); | |
| 116 | ||
| 117 | MODULE_LICENSE("GPL"); | |
| 118 | MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>"); | |
| 119 | MODULE_DESCRIPTION("Generic RAM based MTD for uClinux"); | |
| 120 | ||
| 121 | /****************************************************************************/ |