netsc520.c
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/* netsc520.c -- MTD map driver for AMD NetSc520 Demonstration Board
*
* Copyright (C) 2001 Mark Langsdorf (mark.langsdorf@amd.com)
* based on sc520cdp.c by Sysgo Real-Time Solutions GmbH
*
* 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
*
* The NetSc520 is a demonstration board for the Elan Sc520 processor available
* from AMD. It has a single back of 16 megs of 32-bit Flash ROM and another
* 16 megs of SDRAM.
*/
#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>
/*
** The single, 16 megabyte flash bank is divided into four virtual
** partitions. The first partition is 768 KiB and is intended to
** store the kernel image loaded by the bootstrap loader. The second
** partition is 256 KiB and holds the BIOS image. The third
** partition is 14.5 MiB and is intended for the flash file system
** image. The last partition is 512 KiB and contains another copy
** of the BIOS image and the reset vector.
**
** Only the third partition should be mounted. The first partition
** should not be mounted, but it can erased and written to using the
** MTD character routines. The second and fourth partitions should
** not be touched - it is possible to corrupt the BIOS image by
** mounting these partitions, and potentially the board will not be
** recoverable afterwards.
*/
/* partition_info gives details on the logical partitions that the split the
* single flash device into. If the size if zero we use up to the end of the
* device. */
static struct mtd_partition partition_info[]={
{
.name = "NetSc520 boot kernel",
.offset = 0,
.size = 0xc0000
},
{
.name = "NetSc520 Low BIOS",
.offset = 0xc0000,
.size = 0x40000
},
{
.name = "NetSc520 file system",
.offset = 0x100000,
.size = 0xe80000
},
{
.name = "NetSc520 High BIOS",
.offset = 0xf80000,
.size = 0x80000
},
};
#define NUM_PARTITIONS ARRAY_SIZE(partition_info)
#define WINDOW_SIZE 0x00100000
#define WINDOW_ADDR 0x00200000
static struct map_info netsc520_map = {
.name = "netsc520 Flash Bank",
.size = WINDOW_SIZE,
.bankwidth = 4,
.phys = WINDOW_ADDR,
};
#define NUM_FLASH_BANKS ARRAY_SIZE(netsc520_map)
static struct mtd_info *mymtd;
static int __init init_netsc520(void)
{
printk(KERN_NOTICE "NetSc520 flash device: 0x%Lx at 0x%Lx\n",
(unsigned long long)netsc520_map.size,
(unsigned long long)netsc520_map.phys);
netsc520_map.virt = ioremap_nocache(netsc520_map.phys, netsc520_map.size);
if (!netsc520_map.virt) {
printk("Failed to ioremap_nocache\n");
return -EIO;
}
simple_map_init(&netsc520_map);
mymtd = do_map_probe("cfi_probe", &netsc520_map);
if(!mymtd)
mymtd = do_map_probe("map_ram", &netsc520_map);
if(!mymtd)
mymtd = do_map_probe("map_rom", &netsc520_map);
if (!mymtd) {
iounmap(netsc520_map.virt);
return -ENXIO;
}
mymtd->owner = THIS_MODULE;
mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);
return 0;
}
static void __exit cleanup_netsc520(void)
{
if (mymtd) {
mtd_device_unregister(mymtd);
map_destroy(mymtd);
}
if (netsc520_map.virt) {
iounmap(netsc520_map.virt);
netsc520_map.virt = NULL;
}
}
module_init(init_netsc520);
module_exit(cleanup_netsc520);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>");
MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board");