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/*
* 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 1.2 2001/12/19 13:00:19 jskov 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 <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <asm/hardware.h>
static int nr_parts = 0;
static struct mtd_partition *parts;
static struct mtd_info *mymtd;
extern int parse_redboot_partitions(struct mtd_info *, struct mtd_partition **);
static int epxa10db_default_partitions(struct mtd_info *master, struct mtd_partition **pparts);
static __u8 epxa10db_read8(struct map_info *map, unsigned long ofs)
{
return __raw_readb(map->map_priv_1 + ofs);
}
static __u16 epxa10db_read16(struct map_info *map, unsigned long ofs)
{
return __raw_readw(map->map_priv_1 + ofs);
}
static __u32 epxa10db_read32(struct map_info *map, unsigned long ofs)
{
return __raw_readl(map->map_priv_1 + ofs);
}
static void epxa10db_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
memcpy_fromio(to, (void *)(map->map_priv_1 + from), len);
}
static void epxa10db_write8(struct map_info *map, __u8 d, unsigned long adr)
{
__raw_writeb(d, map->map_priv_1 + adr);
mb();
}
static void epxa10db_write16(struct map_info *map, __u16 d, unsigned long adr)
{
__raw_writew(d, map->map_priv_1 + adr);
mb();
}
static void epxa10db_write32(struct map_info *map, __u32 d, unsigned long adr)
{
__raw_writel(d, map->map_priv_1 + adr);
mb();
}
static void epxa10db_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{
memcpy_toio((void *)(map->map_priv_1 + to), from, len);
}
static struct map_info epxa10db_map = {
name: "EPXA10DB flash",
size: FLASH_SIZE,
buswidth: 2,
read8: epxa10db_read8,
read16: epxa10db_read16,
read32: epxa10db_read32,
copy_from: epxa10db_copy_from,
write8: epxa10db_write8,
write16: epxa10db_write16,
write32: epxa10db_write32,
copy_to: epxa10db_copy_to
};
static int __init epxa10db_mtd_init(void)
{
int i;
printk(KERN_NOTICE "Epxa10db flash device: %x at %x\n", FLASH_SIZE, FLASH_START);
epxa10db_map.map_priv_1 = (unsigned long)ioremap(FLASH_START, FLASH_SIZE);
if (!epxa10db_map.map_priv_1) {
printk("Failed to ioremap Epxa10db flash\n");
return -EIO;
}
mymtd = do_map_probe("cfi_probe", &epxa10db_map);
if (!mymtd) {
iounmap((void *)epxa10db_map.map_priv_1);
return -ENXIO;
}
mymtd->module = THIS_MODULE;
/* Unlock the flash device. */
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,4);
}
}
#ifdef CONFIG_MTD_REDBOOT_PARTS
nr_parts = parse_redboot_partitions(mymtd, &parts);
if (nr_parts > 0) {
add_mtd_partitions(mymtd, parts, nr_parts);
return 0;
}
#endif
#ifdef CONFIG_MTD_AFS_PARTS
nr_parts = parse_afs_partitions(mymtd, &parts);
if (nr_parts > 0) {
add_mtd_partitions(mymtd, parts, nr_parts);
return 0;
}
#endif
/* No recognised partitioning schemes found - use defaults */
nr_parts = epxa10db_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 epxa10db_mtd_cleanup(void)
{
if (mymtd) {
if (nr_parts)
del_mtd_partitions(mymtd);
else
del_mtd_device(mymtd);
map_destroy(mymtd);
}
if (epxa10db_map.map_priv_1) {
iounmap((void *)epxa10db_map.map_priv_1);
epxa10db_map.map_priv_1 = 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 epxa10db_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 epxa10db\n");
npartitions=1;
parts = kmalloc(npartitions*sizeof(*parts)+strlen(name), GFP_KERNEL);
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);
parts[i].size = FLASH_SIZE-0x00400000;
parts[i].offset = 0x00400000;
parts[i].mask_flags = 0;
out:
*pparts = parts;
return npartitions;
}
module_init(epxa10db_mtd_init);
module_exit(epxa10db_mtd_cleanup);
MODULE_AUTHOR("Clive Davies");
MODULE_DESCRIPTION("Altera epxa10db mtd flash map");
MODULE_LICENSE("GPL");
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