| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | /****************************************************************************/ |