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 | * |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 8 | * $Id: uclinux.c,v 1.12 2005/11/07 11:14:29 gleixner Exp $ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | */ |
| 10 | |
| 11 | /****************************************************************************/ |
| 12 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/module.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/fs.h> |
| 18 | #include <linux/major.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/mtd/mtd.h> |
| 20 | #include <linux/mtd/map.h> |
| 21 | #include <linux/mtd/partitions.h> |
| 22 | #include <asm/io.h> |
| 23 | |
| 24 | /****************************************************************************/ |
| 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | struct map_info uclinux_ram_map = { |
| 27 | .name = "RAM", |
| 28 | }; |
| 29 | |
| 30 | struct mtd_info *uclinux_ram_mtdinfo; |
| 31 | |
| 32 | /****************************************************************************/ |
| 33 | |
| 34 | struct mtd_partition uclinux_romfs[] = { |
| 35 | { .name = "ROMfs" } |
| 36 | }; |
| 37 | |
Tobias Klauser | 87d10f3 | 2006-03-31 02:29:45 -0800 | [diff] [blame] | 38 | #define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | /****************************************************************************/ |
| 41 | |
| 42 | int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len, |
| 43 | size_t *retlen, u_char **mtdbuf) |
| 44 | { |
| 45 | struct map_info *map = mtd->priv; |
| 46 | *mtdbuf = (u_char *) (map->virt + ((int) from)); |
| 47 | *retlen = len; |
| 48 | return(0); |
| 49 | } |
| 50 | |
| 51 | /****************************************************************************/ |
| 52 | |
| 53 | int __init uclinux_mtd_init(void) |
| 54 | { |
| 55 | struct mtd_info *mtd; |
| 56 | struct map_info *mapp; |
| 57 | extern char _ebss; |
Greg Ungerer | f6515db | 2005-09-12 11:18:10 +1000 | [diff] [blame] | 58 | unsigned long addr = (unsigned long) &_ebss; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | mapp = &uclinux_ram_map; |
Greg Ungerer | f6515db | 2005-09-12 11:18:10 +1000 | [diff] [blame] | 61 | mapp->phys = addr; |
| 62 | mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(addr + 8)))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | mapp->bankwidth = 4; |
| 64 | |
| 65 | printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n", |
Greg Ungerer | f6515db | 2005-09-12 11:18:10 +1000 | [diff] [blame] | 66 | (int) mapp->phys, (int) mapp->size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
| 68 | mapp->virt = ioremap_nocache(mapp->phys, mapp->size); |
| 69 | |
| 70 | if (mapp->virt == 0) { |
| 71 | printk("uclinux[mtd]: ioremap_nocache() failed\n"); |
| 72 | return(-EIO); |
| 73 | } |
| 74 | |
| 75 | simple_map_init(mapp); |
| 76 | |
| 77 | mtd = do_map_probe("map_ram", mapp); |
| 78 | if (!mtd) { |
| 79 | printk("uclinux[mtd]: failed to find a mapping?\n"); |
| 80 | iounmap(mapp->virt); |
| 81 | return(-ENXIO); |
| 82 | } |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 83 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | mtd->owner = THIS_MODULE; |
| 85 | mtd->point = uclinux_point; |
| 86 | mtd->priv = mapp; |
| 87 | |
| 88 | uclinux_ram_mtdinfo = mtd; |
| 89 | add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS); |
| 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | return(0); |
| 92 | } |
| 93 | |
| 94 | /****************************************************************************/ |
| 95 | |
| 96 | void __exit uclinux_mtd_cleanup(void) |
| 97 | { |
| 98 | if (uclinux_ram_mtdinfo) { |
| 99 | del_mtd_partitions(uclinux_ram_mtdinfo); |
| 100 | map_destroy(uclinux_ram_mtdinfo); |
| 101 | uclinux_ram_mtdinfo = NULL; |
| 102 | } |
Greg Ungerer | f6515db | 2005-09-12 11:18:10 +1000 | [diff] [blame] | 103 | if (uclinux_ram_map.virt) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | iounmap((void *) uclinux_ram_map.virt); |
| 105 | uclinux_ram_map.virt = 0; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | /****************************************************************************/ |
| 110 | |
| 111 | module_init(uclinux_mtd_init); |
| 112 | module_exit(uclinux_mtd_cleanup); |
| 113 | |
| 114 | MODULE_LICENSE("GPL"); |
| 115 | MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>"); |
| 116 | MODULE_DESCRIPTION("Generic RAM based MTD for uClinux"); |
| 117 | |
| 118 | /****************************************************************************/ |