130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
/****************************************************************************/
|
|
|
|
/*
|
|
* 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>
|
|
|
|
/****************************************************************************/
|
|
|
|
extern char _ebss;
|
|
|
|
struct map_info uclinux_ram_map = {
|
|
.name = "RAM",
|
|
.phys = (unsigned long)&_ebss,
|
|
.size = 0,
|
|
};
|
|
|
|
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 (!mapp->size)
|
|
mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 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;
|
|
#ifdef CONFIG_MTD_PARTITIONS
|
|
add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS);
|
|
#else
|
|
add_mtd_device(mtd);
|
|
#endif
|
|
|
|
return(0);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
static void __exit uclinux_mtd_cleanup(void)
|
|
{
|
|
if (uclinux_ram_mtdinfo) {
|
|
#ifdef CONFIG_MTD_PARTITIONS
|
|
del_mtd_partitions(uclinux_ram_mtdinfo);
|
|
#else
|
|
del_mtd_device(uclinux_ram_mtdinfo);
|
|
#endif
|
|
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");
|
|
|
|
/****************************************************************************/
|