1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
177 lines
4.3 KiB
C
177 lines
4.3 KiB
C
/*
|
|
* 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 1.13 2004/11/04 13:24:14 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 <asm/io.h>
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/map.h>
|
|
#include <linux/mtd/partitions.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");
|