Commit 7c1b4cff authored by Alan Cox's avatar Alan Cox Committed by Linus Torvalds

[PATCH] UCLinux generic memory mapped MTD driver

parent c9e52e0b
...@@ -346,5 +346,11 @@ config MTD_PCMCIA ...@@ -346,5 +346,11 @@ config MTD_PCMCIA
cards are usually around 4-16MiB in size. This does not include cards are usually around 4-16MiB in size. This does not include
Compact Flash cards which are treated as IDE devices. Compact Flash cards which are treated as IDE devices.
config MTD_UCLINUX
tristate "Generic uClinux RAM/ROM filesystem support"
depends on MTD_PARTITIONS
help
Map driver to support image based filesystems for uClinux.
endmenu endmenu
...@@ -30,6 +30,7 @@ obj-$(CONFIG_MTD_VMAX) += vmax301.o ...@@ -30,6 +30,7 @@ obj-$(CONFIG_MTD_VMAX) += vmax301.o
obj-$(CONFIG_MTD_SCx200_DOCFLASH)+= scx200_docflash.o obj-$(CONFIG_MTD_SCx200_DOCFLASH)+= scx200_docflash.o
obj-$(CONFIG_MTD_DBOX2) += dbox2-flash.o obj-$(CONFIG_MTD_DBOX2) += dbox2-flash.o
obj-$(CONFIG_MTD_OCELOT) += ocelot.o obj-$(CONFIG_MTD_OCELOT) += ocelot.o
obj-$(CONFIG_MTD_UCLINUX) += uclinux.o
obj-$(CONFIG_MTD_SOLUTIONENGINE)+= solutionengine.o obj-$(CONFIG_MTD_SOLUTIONENGINE)+= solutionengine.o
obj-$(CONFIG_MTD_PCI) += pci.o obj-$(CONFIG_MTD_PCI) += pci.o
obj-$(CONFIG_MTD_AUTCPU12) += autcpu12-nvram.o obj-$(CONFIG_MTD_AUTCPU12) += autcpu12-nvram.o
......
/****************************************************************************/
/*
* uclinux.c -- generic memory mapped MTD driver for uclinux
*
* (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com)
*/
/****************************************************************************/
#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>
/****************************************************************************/
__u8 uclinux_read8(struct map_info *map, unsigned long ofs)
{
return(*((__u8 *) (map->map_priv_1 + ofs)));
}
__u16 uclinux_read16(struct map_info *map, unsigned long ofs)
{
return(*((__u16 *) (map->map_priv_1 + ofs)));
}
__u32 uclinux_read32(struct map_info *map, unsigned long ofs)
{
return(*((__u32 *) (map->map_priv_1 + ofs)));
}
void uclinux_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
memcpy(to, (void *)(map->map_priv_1 + from), len);
}
void uclinux_write8(struct map_info *map, __u8 d, unsigned long adr)
{
*((__u8 *) (map->map_priv_1 + adr)) = d;
}
void uclinux_write16(struct map_info *map, __u16 d, unsigned long adr)
{
*((__u16 *) (map->map_priv_1 + adr)) = d;
}
void uclinux_write32(struct map_info *map, __u32 d, unsigned long adr)
{
*((__u32 *) (map->map_priv_1 + adr)) = d;
}
void uclinux_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{
memcpy((void *) (map->map_priv_1 + to), from, len);
}
/****************************************************************************/
struct map_info uclinux_ram_map = {
name: "RAM",
read8: uclinux_read8,
read16: uclinux_read16,
read32: uclinux_read32,
copy_from: uclinux_copy_from,
write8: uclinux_write8,
write16: uclinux_write16,
write32: uclinux_write32,
copy_to: uclinux_copy_to,
};
struct mtd_info *uclinux_ram_mtdinfo;
/****************************************************************************/
struct mtd_partition uclinux_romfs[] = {
{ name: "ROMfs", offset: 0 }
};
#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->map_priv_1 + ((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->map_priv_2 = (unsigned long) &_ebss;
mapp->size = PAGE_ALIGN(*((unsigned long *)((&_ebss) + 8)));
mapp->buswidth = 4;
printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",
(int) mapp->map_priv_2, (int) mapp->size);
mapp->map_priv_1 = (unsigned long)
ioremap_nocache(mapp->map_priv_2, mapp->size);
if (mapp->map_priv_1 == 0) {
printk("uclinux[mtd]: ioremap_nocache() failed\n");
return(-EIO);
}
mtd = do_map_probe("map_ram", mapp);
if (!mtd) {
printk("uclinux[mtd]: failed to find a mapping?\n");
iounmap((void *) mapp->map_priv_1);
return(-ENXIO);
}
mtd->module = 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.map_priv_1);
uclinux_ram_map.map_priv_1 = 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");
/****************************************************************************/
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