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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
*
* $Id: netsc520.c,v 1.5 2001/10/02 15:05:14 dwmw2 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
*
* 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 <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.
*/
static __u8 netsc520_read8(struct map_info *map, unsigned long ofs)
{
return readb(map->map_priv_1 + ofs);
}
static __u16 netsc520_read16(struct map_info *map, unsigned long ofs)
{
return readw(map->map_priv_1 + ofs);
}
static __u32 netsc520_read32(struct map_info *map, unsigned long ofs)
{
return readl(map->map_priv_1 + ofs);
}
static void netsc520_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 netsc520_write8(struct map_info *map, __u8 d, unsigned long adr)
{
writeb(d, map->map_priv_1 + adr);
}
static void netsc520_write16(struct map_info *map, __u16 d, unsigned long adr)
{
writew(d, map->map_priv_1 + adr);
}
static void netsc520_write32(struct map_info *map, __u32 d, unsigned long adr)
{
writel(d, map->map_priv_1 + adr);
}
static void netsc520_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);
}
/* 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 (sizeof(partition_info)/sizeof(partition_info[0]))
/*
* If no idea what is going on here. This is taken from the FlashFX stuff.
*/
#define ROMCS 1
#define WINDOW_SIZE 0x00100000
#define WINDOW_ADDR 0x00200000
static struct map_info netsc520_map = {
name: "netsc520 Flash Bank",
size: WINDOW_SIZE,
buswidth: 4,
read8: netsc520_read8,
read16: netsc520_read16,
read32: netsc520_read32,
copy_from: netsc520_copy_from,
write8: netsc520_write8,
write16: netsc520_write16,
write32: netsc520_write32,
copy_to: netsc520_copy_to,
map_priv_2: WINDOW_ADDR
};
#define NUM_FLASH_BANKS (sizeof(netsc520_map)/sizeof(struct map_info))
static struct mtd_info *mymtd;
static int __init init_netsc520(void)
{
printk(KERN_NOTICE "NetSc520 flash device: %lx at %lx\n", netsc520_map.size, netsc520_map.map_priv_2);
netsc520_map.map_priv_1 = (unsigned long)ioremap_nocache(netsc520_map.map_priv_2, netsc520_map.size);
if (!netsc520_map.map_priv_1) {
printk("Failed to ioremap_nocache\n");
return -EIO;
}
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((void *)netsc520_map.map_priv_1);
return -ENXIO;
}
mymtd->module = THIS_MODULE;
add_mtd_partitions( mymtd, partition_info, NUM_PARTITIONS );
return 0;
}
static void __exit cleanup_netsc520(void)
{
if (mymtd) {
del_mtd_partitions(mymtd);
map_destroy(mymtd);
}
if (netsc520_map.map_priv_1) {
iounmap((void *)netsc520_map.map_priv_1);
netsc520_map.map_priv_1 = 0;
}
}
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");
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