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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 | /****************************************************************************/ /* * uclinux.c -- generic memory mapped MTD driver for uclinux * * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com) * * License: GPL */ /****************************************************************************/ #include <linux/moduleparam.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); } device_initcall(uclinux_mtd_init); /****************************************************************************/ |