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This type of flash translation layer (FTL) is used by the Embedded BIOS by General Software. It is known as the Resident Flash Disk (RFD), see: http://www.gensw.com/pages/prod/bios/rfd.htm Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
140 lines
3.2 KiB
C
140 lines
3.2 KiB
C
/*
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* ts5500_flash.c -- MTD map driver for Technology Systems TS-5500 board
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*
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* Copyright (C) 2004 Sean Young <sean@mess.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*
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* Note:
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* - In order for detection to work, jumper 3 must be set.
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* - Drive A and B use the resident flash disk (RFD) flash translation layer.
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* - If you have created your own jffs file system and the bios overwrites
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* it during boot, try disabling Drive A: and B: in the boot order.
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*
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* $Id: ts5500_flash.c,v 1.3 2005/06/16 08:49:30 sean Exp $
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#ifdef CONFIG_MTD_PARTITIONS
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#include <linux/mtd/partitions.h>
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#endif
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#define WINDOW_ADDR 0x09400000
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#define WINDOW_SIZE 0x00200000
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static struct map_info ts5500_map = {
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.name = "TS-5500 Flash",
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.size = WINDOW_SIZE,
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.bankwidth = 1,
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.phys = WINDOW_ADDR
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};
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#ifdef CONFIG_MTD_PARTITIONS
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static struct mtd_partition ts5500_partitions[] = {
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{
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.name = "Drive A",
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.offset = 0,
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.size = 0x0e0000
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},
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{
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.name = "BIOS",
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.offset = 0x0e0000,
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.size = 0x020000,
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},
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{
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.name = "Drive B",
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.offset = 0x100000,
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.size = 0x100000
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}
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};
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#define NUM_PARTITIONS (sizeof(ts5500_partitions)/sizeof(struct mtd_partition))
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#endif
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static struct mtd_info *mymtd;
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static int __init init_ts5500_map(void)
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{
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int rc = 0;
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ts5500_map.virt = ioremap_nocache(ts5500_map.phys, ts5500_map.size);
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if(!ts5500_map.virt) {
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printk(KERN_ERR "Failed to ioremap_nocache\n");
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rc = -EIO;
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goto err_out_ioremap;
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}
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simple_map_init(&ts5500_map);
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mymtd = do_map_probe("jedec_probe", &ts5500_map);
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if(!mymtd)
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mymtd = do_map_probe("map_rom", &ts5500_map);
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if(!mymtd) {
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rc = -ENXIO;
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goto err_out_map;
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}
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mymtd->owner = THIS_MODULE;
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#ifdef CONFIG_MTD_PARTITIONS
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add_mtd_partitions(mymtd, ts5500_partitions, NUM_PARTITIONS);
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#else
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add_mtd_device(mymtd);
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#endif
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return 0;
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err_out_map:
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map_destroy(mymtd);
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err_out_ioremap:
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iounmap(ts5500_map.virt);
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return rc;
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}
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static void __exit cleanup_ts5500_map(void)
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{
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if (mymtd) {
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#ifdef CONFIG_MTD_PARTITIONS
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del_mtd_partitions(mymtd);
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#else
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del_mtd_device(mymtd);
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#endif
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map_destroy(mymtd);
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}
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if (ts5500_map.virt) {
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iounmap(ts5500_map.virt);
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ts5500_map.virt = NULL;
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}
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}
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module_init(init_ts5500_map);
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module_exit(cleanup_ts5500_map);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Sean Young <sean@mess.org>");
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MODULE_DESCRIPTION("MTD map driver for Techology Systems TS-5500 board");
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