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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 | /****************************************************************************/ /* * uclinux.c -- generic memory mapped MTD driver for uclinux * * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com) */ /****************************************************************************/ #include <linux/module.h> #include <linux/types.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/fs.h> #include <linux/mm.h> #include <linux/major.h> #include <linux/mtd/mtd.h> #include <linux/mtd/map.h> #include <linux/mtd/partitions.h> #include <asm/io.h> #include <asm/sections.h> /****************************************************************************/ #ifdef CONFIG_MTD_ROM #define MAP_NAME "rom" #else #define MAP_NAME "ram" #endif /* * Blackfin uses uclinux_ram_map during startup, so it must not be static. * Provide a dummy declaration to make sparse happy. */ extern struct map_info uclinux_ram_map; struct map_info uclinux_ram_map = { .name = MAP_NAME, .size = 0, }; static unsigned long physaddr = -1; module_param(physaddr, ulong, S_IRUGO); static struct mtd_info *uclinux_ram_mtdinfo; /****************************************************************************/ static struct mtd_partition uclinux_romfs[] = { { .name = "ROMfs" } }; #define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs) /****************************************************************************/ static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, void **virt, resource_size_t *phys) { struct map_info *map = mtd->priv; *virt = map->virt + from; if (phys) *phys = map->phys + from; *retlen = len; return(0); } /****************************************************************************/ static int __init uclinux_mtd_init(void) { struct mtd_info *mtd; struct map_info *mapp; mapp = &uclinux_ram_map; if (physaddr == -1) mapp->phys = (resource_size_t)__bss_stop; else mapp->phys = physaddr; if (!mapp->size) mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8)))); mapp->bankwidth = 4; printk("uclinux[mtd]: probe address=0x%x size=0x%x\n", (int) mapp->phys, (int) mapp->size); /* * The filesystem is guaranteed to be in direct mapped memory. It is * directly following the kernels own bss region. Following the same * mechanism used by architectures setting up traditional initrds we * use phys_to_virt to get the virtual address of its start. */ mapp->virt = phys_to_virt(mapp->phys); if (mapp->virt == 0) { printk("uclinux[mtd]: no virtual mapping?\n"); return(-EIO); } simple_map_init(mapp); mtd = do_map_probe("map_" MAP_NAME, mapp); if (!mtd) { printk("uclinux[mtd]: failed to find a mapping?\n"); return(-ENXIO); } mtd->owner = THIS_MODULE; mtd->_point = uclinux_point; mtd->priv = mapp; uclinux_ram_mtdinfo = mtd; mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS); return(0); } /****************************************************************************/ static void __exit uclinux_mtd_cleanup(void) { if (uclinux_ram_mtdinfo) { mtd_device_unregister(uclinux_ram_mtdinfo); map_destroy(uclinux_ram_mtdinfo); uclinux_ram_mtdinfo = NULL; } if (uclinux_ram_map.virt) uclinux_ram_map.virt = 0; } /****************************************************************************/ module_init(uclinux_mtd_init); module_exit(uclinux_mtd_cleanup); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>"); MODULE_DESCRIPTION("Generic MTD for uClinux"); /****************************************************************************/ |