| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * $Id: physmap.c,v 1.37 2004/11/28 09:40:40 dwmw2 Exp $ |
| 3 | * |
| 4 | * Normal mappings of chips in physical memory |
| 5 | * |
| 6 | * Copyright (C) 2003 MontaVista Software Inc. |
| 7 | * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net |
| 8 | * |
| 9 | * 031022 - [jsun] add run-time configure and partition setup |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/types.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <asm/io.h> |
| 18 | #include <linux/mtd/mtd.h> |
| 19 | #include <linux/mtd/map.h> |
| 20 | #include <linux/config.h> |
| 21 | #include <linux/mtd/partitions.h> |
| 22 | |
| 23 | static struct mtd_info *mymtd; |
| 24 | |
| 25 | struct map_info physmap_map = { |
| 26 | .name = "phys_mapped_flash", |
| 27 | .phys = CONFIG_MTD_PHYSMAP_START, |
| 28 | .size = CONFIG_MTD_PHYSMAP_LEN, |
| 29 | .bankwidth = CONFIG_MTD_PHYSMAP_BANKWIDTH, |
| 30 | }; |
| 31 | |
| 32 | #ifdef CONFIG_MTD_PARTITIONS |
| 33 | static struct mtd_partition *mtd_parts; |
| 34 | static int mtd_parts_nb; |
| 35 | |
| 36 | static int num_physmap_partitions; |
| 37 | static struct mtd_partition *physmap_partitions; |
| 38 | |
| 39 | static const char *part_probes[] __initdata = {"cmdlinepart", "RedBoot", NULL}; |
| 40 | |
| 41 | void physmap_set_partitions(struct mtd_partition *parts, int num_parts) |
| 42 | { |
| 43 | physmap_partitions=parts; |
| 44 | num_physmap_partitions=num_parts; |
| 45 | } |
| 46 | #endif /* CONFIG_MTD_PARTITIONS */ |
| 47 | |
| 48 | static int __init init_physmap(void) |
| 49 | { |
| 50 | static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL }; |
| 51 | const char **type; |
| 52 | |
| 53 | printk(KERN_NOTICE "physmap flash device: %lx at %lx\n", physmap_map.size, physmap_map.phys); |
| 54 | physmap_map.virt = ioremap(physmap_map.phys, physmap_map.size); |
| 55 | |
| 56 | if (!physmap_map.virt) { |
| 57 | printk("Failed to ioremap\n"); |
| 58 | return -EIO; |
| 59 | } |
| 60 | |
| 61 | simple_map_init(&physmap_map); |
| 62 | |
| 63 | mymtd = NULL; |
| 64 | type = rom_probe_types; |
| 65 | for(; !mymtd && *type; type++) { |
| 66 | mymtd = do_map_probe(*type, &physmap_map); |
| 67 | } |
| 68 | if (mymtd) { |
| 69 | mymtd->owner = THIS_MODULE; |
| 70 | |
| 71 | #ifdef CONFIG_MTD_PARTITIONS |
| 72 | mtd_parts_nb = parse_mtd_partitions(mymtd, part_probes, |
| 73 | &mtd_parts, 0); |
| 74 | |
| 75 | if (mtd_parts_nb > 0) |
| 76 | { |
| 77 | add_mtd_partitions (mymtd, mtd_parts, mtd_parts_nb); |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | if (num_physmap_partitions != 0) |
| 82 | { |
| 83 | printk(KERN_NOTICE |
| 84 | "Using physmap partition definition\n"); |
| 85 | add_mtd_partitions (mymtd, physmap_partitions, num_physmap_partitions); |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | #endif |
| 90 | add_mtd_device(mymtd); |
| 91 | |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | iounmap(physmap_map.virt); |
| 96 | return -ENXIO; |
| 97 | } |
| 98 | |
| 99 | static void __exit cleanup_physmap(void) |
| 100 | { |
| 101 | #ifdef CONFIG_MTD_PARTITIONS |
| 102 | if (mtd_parts_nb) { |
| 103 | del_mtd_partitions(mymtd); |
| 104 | kfree(mtd_parts); |
| 105 | } else if (num_physmap_partitions) { |
| 106 | del_mtd_partitions(mymtd); |
| 107 | } else { |
| 108 | del_mtd_device(mymtd); |
| 109 | } |
| 110 | #else |
| 111 | del_mtd_device(mymtd); |
| 112 | #endif |
| 113 | map_destroy(mymtd); |
| 114 | |
| 115 | iounmap(physmap_map.virt); |
| 116 | physmap_map.virt = NULL; |
| 117 | } |
| 118 | |
| 119 | module_init(init_physmap); |
| 120 | module_exit(cleanup_physmap); |
| 121 | |
| 122 | |
| 123 | MODULE_LICENSE("GPL"); |
| 124 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); |
| 125 | MODULE_DESCRIPTION("Generic configurable MTD map driver"); |