Viewing file:  physmap.c (2.6 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* $Id: physmap.c,v 1.15 2001/10/02 15:05:14 dwmw2 Exp $
*
* Normal mappings of chips in physical memory
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/config.h>
#define WINDOW_ADDR CONFIG_MTD_PHYSMAP_START
#define WINDOW_SIZE CONFIG_MTD_PHYSMAP_LEN
#define BUSWIDTH CONFIG_MTD_PHYSMAP_BUSWIDTH
static struct mtd_info *mymtd;
__u8 physmap_read8(struct map_info *map, unsigned long ofs)
{
return __raw_readb(map->map_priv_1 + ofs);
}
__u16 physmap_read16(struct map_info *map, unsigned long ofs)
{
return __raw_readw(map->map_priv_1 + ofs);
}
__u32 physmap_read32(struct map_info *map, unsigned long ofs)
{
return __raw_readl(map->map_priv_1 + ofs);
}
void physmap_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
memcpy_fromio(to, map->map_priv_1 + from, len);
}
void physmap_write8(struct map_info *map, __u8 d, unsigned long adr)
{
__raw_writeb(d, map->map_priv_1 + adr);
mb();
}
void physmap_write16(struct map_info *map, __u16 d, unsigned long adr)
{
__raw_writew(d, map->map_priv_1 + adr);
mb();
}
void physmap_write32(struct map_info *map, __u32 d, unsigned long adr)
{
__raw_writel(d, map->map_priv_1 + adr);
mb();
}
void physmap_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{
memcpy_toio(map->map_priv_1 + to, from, len);
}
struct map_info physmap_map = {
name: "Physically mapped flash",
size: WINDOW_SIZE,
buswidth: BUSWIDTH,
read8: physmap_read8,
read16: physmap_read16,
read32: physmap_read32,
copy_from: physmap_copy_from,
write8: physmap_write8,
write16: physmap_write16,
write32: physmap_write32,
copy_to: physmap_copy_to
};
int __init init_physmap(void)
{
printk(KERN_NOTICE "physmap flash device: %x at %x\n", WINDOW_SIZE, WINDOW_ADDR);
physmap_map.map_priv_1 = (unsigned long)ioremap(WINDOW_ADDR, WINDOW_SIZE);
if (!physmap_map.map_priv_1) {
printk("Failed to ioremap\n");
return -EIO;
}
mymtd = do_map_probe("cfi_probe", &physmap_map);
if (mymtd) {
mymtd->module = THIS_MODULE;
add_mtd_device(mymtd);
return 0;
}
iounmap((void *)physmap_map.map_priv_1);
return -ENXIO;
}
static void __exit cleanup_physmap(void)
{
if (mymtd) {
del_mtd_device(mymtd);
map_destroy(mymtd);
}
if (physmap_map.map_priv_1) {
iounmap((void *)physmap_map.map_priv_1);
physmap_map.map_priv_1 = 0;
}
}
module_init(init_physmap);
module_exit(cleanup_physmap);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("Generic configurable MTD map driver");
|