| | 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 | |
| | 9 | /****************************************************************************/ |
| | 10 | |
| | 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> |
| | 16 | #include <linux/mm.h> |
| | 17 | #include <linux/major.h> |
| | 18 | #include <linux/mtd/mtd.h> |
| | 19 | #include <linux/mtd/map.h> |
| | 20 | #include <linux/mtd/partitions.h> |
| | 21 | #include <asm/io.h> |
| | 22 | #include <asm/sections.h> |
| | 23 | |
| | 24 | /****************************************************************************/ |
| | 25 | |
| | 26 | struct map_info uclinux_ram_map = { |
| | 27 | .name = "RAM", |
| | 28 | .phys = (unsigned long)__bss_stop, |
| | 29 | .size = 0, |
| | 30 | }; |
| | 31 | |
| | 32 | static struct mtd_info *uclinux_ram_mtdinfo; |
| | 33 | |
| | 34 | /****************************************************************************/ |
| | 35 | |
| | 36 | static struct mtd_partition uclinux_romfs[] = { |
| | 37 | { .name = "ROMfs" } |
| | 38 | }; |
| | 39 | |
| | 40 | #define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs) |
| | 41 | |
| | 42 | /****************************************************************************/ |
| | 43 | |
| | 44 | static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len, |
| | 45 | size_t *retlen, void **virt, resource_size_t *phys) |
| | 46 | { |
| | 47 | struct map_info *map = mtd->priv; |
| | 48 | *virt = map->virt + from; |
| | 49 | if (phys) |
| | 50 | *phys = map->phys + from; |
| | 51 | *retlen = len; |
| | 52 | return(0); |
| | 53 | } |
| | 54 | |
| | 55 | /****************************************************************************/ |
| | 56 | |
| | 57 | static int __init uclinux_mtd_init(void) |
| | 58 | { |
| | 59 | struct mtd_info *mtd; |
| | 60 | struct map_info *mapp; |
| | 61 | |
| | 62 | mapp = &uclinux_ram_map; |
| | 63 | if (!mapp->size) |
| | 64 | mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8)))); |
| | 65 | mapp->bankwidth = 4; |
| | 66 | |
| | 67 | printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n", |
| | 68 | (int) mapp->phys, (int) mapp->size); |
| | 69 | |
| | 70 | /* |
| | 71 | * The filesystem is guaranteed to be in direct mapped memory. It is |
| | 72 | * directly following the kernels own bss region. Following the same |
| | 73 | * mechanism used by architectures setting up traditional initrds we |
| | 74 | * use phys_to_virt to get the virtual address of its start. |
| | 75 | */ |
| | 76 | mapp->virt = phys_to_virt(mapp->phys); |
| | 77 | |
| | 78 | if (mapp->virt == 0) { |
| | 79 | printk("uclinux[mtd]: no virtual mapping?\n"); |
| | 80 | return(-EIO); |
| | 81 | } |
| | 82 | |
| | 83 | simple_map_init(mapp); |
| | 84 | |
| | 85 | mtd = do_map_probe("map_ram", mapp); |
| | 86 | if (!mtd) { |
| | 87 | printk("uclinux[mtd]: failed to find a mapping?\n"); |
| | 88 | return(-ENXIO); |
| | 89 | } |
| | 90 | |
| | 91 | mtd->owner = THIS_MODULE; |
| | 92 | mtd->_point = uclinux_point; |
| | 93 | mtd->priv = mapp; |
| | 94 | |
| | 95 | uclinux_ram_mtdinfo = mtd; |
| | 96 | mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS); |
| | 97 | |
| | 98 | return(0); |
| | 99 | } |
| | 100 | |
| | 101 | /****************************************************************************/ |
| | 102 | |
| | 103 | static void __exit uclinux_mtd_cleanup(void) |
| | 104 | { |
| | 105 | if (uclinux_ram_mtdinfo) { |
| | 106 | mtd_device_unregister(uclinux_ram_mtdinfo); |
| | 107 | map_destroy(uclinux_ram_mtdinfo); |
| | 108 | uclinux_ram_mtdinfo = NULL; |
| | 109 | } |
| | 110 | if (uclinux_ram_map.virt) |
| | 111 | uclinux_ram_map.virt = 0; |
| | 112 | } |
| | 113 | |
| | 114 | /****************************************************************************/ |
| | 115 | |
| | 116 | module_init(uclinux_mtd_init); |
| | 117 | module_exit(uclinux_mtd_cleanup); |
| | 118 | |
| | 119 | MODULE_LICENSE("GPL"); |
| | 120 | MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>"); |
| | 121 | MODULE_DESCRIPTION("Generic RAM based MTD for uClinux"); |
| | 122 | |
| | 123 | /****************************************************************************/ |
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