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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 | /****************************************************************************/ /* * uclinux.c -- generic memory mapped MTD driver for uclinux * * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com) * * $Id: uclinux.c,v 1.7 2004/07/12 21:59:45 dwmw2 Exp $ */ /****************************************************************************/ #include <linux/config.h> #include <linux/module.h> #include <linux/types.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/fs.h> #include <linux/major.h> #include <linux/root_dev.h> #include <linux/mtd/mtd.h> #include <linux/mtd/map.h> #include <linux/mtd/partitions.h> #include <asm/io.h> /****************************************************************************/ /****************************************************************************/ struct map_info uclinux_ram_map = { .name = "RAM", }; struct mtd_info *uclinux_ram_mtdinfo; /****************************************************************************/ struct mtd_partition uclinux_romfs[] = { { .name = "ROMfs" } }; #define NUM_PARTITIONS (sizeof(uclinux_romfs) / sizeof(uclinux_romfs[0])) /****************************************************************************/ int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf) { struct map_info *map = (struct map_info *) mtd->priv; *mtdbuf = (u_char *) (map->virt + ((int) from)); *retlen = len; return(0); } /****************************************************************************/ int __init uclinux_mtd_init(void) { struct mtd_info *mtd; struct map_info *mapp; extern char _ebss; mapp = &uclinux_ram_map; mapp->phys = (unsigned long) &_ebss; mapp->size = PAGE_ALIGN(*((unsigned long *)((&_ebss) + 8))); mapp->bankwidth = 4; printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n", (int) mapp->map_priv_2, (int) mapp->size); mapp->virt = ioremap_nocache(mapp->phys, mapp->size); if (!mapp->virt) { printk("uclinux[mtd]: ioremap_nocache() failed\n"); return(-EIO); } simple_map_init(mapp); mtd = do_map_probe("map_ram", mapp); if (!mtd) { printk("uclinux[mtd]: failed to find a mapping?\n"); iounmap(mapp->virt); return(-ENXIO); } mtd->owner = THIS_MODULE; mtd->point = uclinux_point; mtd->priv = mapp; uclinux_ram_mtdinfo = mtd; add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS); printk("uclinux[mtd]: set %s to be root filesystem\n", uclinux_romfs[0].name); ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, 0); put_mtd_device(mtd); return(0); } /****************************************************************************/ void __exit uclinux_mtd_cleanup(void) { if (uclinux_ram_mtdinfo) { del_mtd_partitions(uclinux_ram_mtdinfo); map_destroy(uclinux_ram_mtdinfo); uclinux_ram_mtdinfo = NULL; } if (uclinux_ram_map.map_priv_1) { iounmap((void *) 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 RAM based MTD for uClinux"); /****************************************************************************/ |