| /****************************************************************************/ |
| |
| /* |
| * uclinux.c -- generic memory mapped MTD driver for uclinux |
| * |
| * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com) |
| * |
| * $Id: uclinux.c,v 1.12 2005/11/07 11:14:29 gleixner Exp $ |
| */ |
| |
| /****************************************************************************/ |
| |
| #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/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 ARRAY_SIZE(uclinux_romfs) |
| |
| /****************************************************************************/ |
| |
| 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); |
| } |
| |
| /****************************************************************************/ |
| |
| int __init uclinux_mtd_init(void) |
| { |
| struct mtd_info *mtd; |
| struct map_info *mapp; |
| extern char _ebss; |
| unsigned long addr = (unsigned long) &_ebss; |
| |
| mapp = &uclinux_ram_map; |
| mapp->phys = addr; |
| mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(addr + 8)))); |
| mapp->bankwidth = 4; |
| |
| printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n", |
| (int) mapp->phys, (int) mapp->size); |
| |
| mapp->virt = ioremap_nocache(mapp->phys, mapp->size); |
| |
| if (mapp->virt == 0) { |
| 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); |
| |
| 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.virt) { |
| 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"); |
| |
| /****************************************************************************/ |