/*
* Flash memory access on EPXA based devices
*
* (C) 2000 Nicolas Pitre <nico@cam.org>
* Copyright (C) 2001 Altera Corporation
* Copyright (C) 2001 Red Hat, Inc.
*
* $Id: epxa10db-flash.c,v 1.15 2005/11/07 11:14:27 gleixner Exp $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
#include <asm/hardware.h>
#ifdef CONFIG_EPXA10DB
#define BOARD_NAME "EPXA10DB"
#else
#define BOARD_NAME "EPXA1DB"
#endif
static int nr_parts = 0;
static struct mtd_partition *parts;
static struct mtd_info *mymtd;
static int epxa_default_partitions(struct mtd_info *master, struct mtd_partition **pparts);
static struct map_info epxa_map = {
.name = "EPXA flash",
.size = FLASH_SIZE,
.bankwidth = 2,
.phys = FLASH_START,
};
static const char *probes[] = { "RedBoot", "afs", NULL };
static int __init epxa_mtd_init(void)
{
int i;
printk(KERN_NOTICE "%s flash device: 0x%x at 0x%x\n", BOARD_NAME, FLASH_SIZE, FLASH_START);
epxa_map.virt = ioremap(FLASH_START, FLASH_SIZE);
if (!epxa_map.virt) {
printk("Failed to ioremap %s flash\n",BOARD_NAME);
return -EIO;
}
simple_map_init(&epxa_map);
mymtd = do_map_probe("cfi_probe", &epxa_map);
if (!mymtd) {
iounmap((void *)epxa_map.virt);
return -ENXIO;
}
mymtd->owner = THIS_MODULE;
/* Unlock the flash device. */
if(mymtd->unlock){
for (i=0; i<mymtd->numeraseregions;i++){
int j;
for(j=0;j<mymtd->eraseregions[i].numblocks;j++){
mymtd->unlock(mymtd,mymtd->eraseregions[i].offset + j * mymtd->eraseregions[i].erasesize,mymtd->eraseregions[i].erasesize);
}
}
}
#ifdef CONFIG_MTD_PARTITIONS
nr_parts = parse_mtd_partitions(mymtd, probes, &parts, 0);
if (nr_parts > 0) {
add_mtd_partitions(mymtd, parts, nr_parts);
return 0;
}
#endif
/* No recognised partitioning schemes found - use defaults */
nr_parts = epxa_default_partitions(mymtd, &parts);
if (nr_parts > 0) {
add_mtd_partitions(mymtd, parts, nr_parts);
return 0;
}
/* If all else fails... */
add_mtd_device(mymtd);
return 0;
}
static void __exit epxa_mtd_cleanup(void)
{
if (mymtd) {
if (nr_parts)
del_mtd_partitions(mymtd);
else
del_mtd_device(mymtd);
map_destroy(mymtd);
}
if (epxa_map.virt) {
iounmap((void *)epxa_map.virt);
epxa_map.virt = 0;
}
}
/*
* This will do for now, once we decide which bootldr we're finally
* going to use then we'll remove this function and do it properly
*
* Partions are currently (as offsets from base of flash):
* 0x00000000 - 0x003FFFFF - bootloader (!)
* 0x00400000 - 0x00FFFFFF - Flashdisk
*/
static int __init epxa_default_partitions(struct mtd_info *master, struct mtd_partition **pparts)
{
struct mtd_partition *parts;
int ret, i;
int npartitions = 0;
char *names;
const char *name = "jffs";
printk("Using default partitions for %s\n",BOARD_NAME);
npartitions=1;
parts = kmalloc(npartitions*sizeof(*parts)+strlen(name), GFP_KERNEL);
memzero(parts,npartitions*sizeof(*parts)+strlen(name));
if (!parts) {
ret = -ENOMEM;
goto out;
}
i=0;
names = (char *)&parts[npartitions];
parts[i].name = names;
names += strlen(name) + 1;
strcpy(parts[i].name, name);
#ifdef CONFIG_EPXA10DB
parts[i].size = FLASH_SIZE-0x00400000;
parts[i].offset = 0x00400000;
#else
parts[i].size = FLASH_SIZE-0x00180000;
parts[i].offset = 0x00180000;
#endif
out:
*pparts = parts;
return npartitions;
}
module_init(epxa_mtd_init);
module_exit(epxa_mtd_cleanup);
MODULE_AUTHOR("Clive Davies");
MODULE_DESCRIPTION("Altera epxa mtd flash map");
MODULE_LICENSE("GPL");
