forked from Minki/linux
180 lines
4.3 KiB
C
180 lines
4.3 KiB
C
/*
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* Flash memory access on EPXA based devices
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*
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* (C) 2000 Nicolas Pitre <nico@cam.org>
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* Copyright (C) 2001 Altera Corporation
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* Copyright (C) 2001 Red Hat, Inc.
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*
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* $Id: epxa10db-flash.c,v 1.15 2005/11/07 11:14:27 gleixner Exp $
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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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#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/slab.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <asm/io.h>
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#include <asm/hardware.h>
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#ifdef CONFIG_EPXA10DB
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#define BOARD_NAME "EPXA10DB"
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#else
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#define BOARD_NAME "EPXA1DB"
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#endif
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static int nr_parts = 0;
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static struct mtd_partition *parts;
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static struct mtd_info *mymtd;
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static int epxa_default_partitions(struct mtd_info *master, struct mtd_partition **pparts);
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static struct map_info epxa_map = {
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.name = "EPXA flash",
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.size = FLASH_SIZE,
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.bankwidth = 2,
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.phys = FLASH_START,
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};
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static const char *probes[] = { "RedBoot", "afs", NULL };
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static int __init epxa_mtd_init(void)
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{
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int i;
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printk(KERN_NOTICE "%s flash device: 0x%x at 0x%x\n", BOARD_NAME, FLASH_SIZE, FLASH_START);
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epxa_map.virt = ioremap(FLASH_START, FLASH_SIZE);
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if (!epxa_map.virt) {
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printk("Failed to ioremap %s flash\n",BOARD_NAME);
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return -EIO;
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}
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simple_map_init(&epxa_map);
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mymtd = do_map_probe("cfi_probe", &epxa_map);
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if (!mymtd) {
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iounmap((void *)epxa_map.virt);
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return -ENXIO;
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}
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mymtd->owner = THIS_MODULE;
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/* Unlock the flash device. */
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if(mymtd->unlock){
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for (i=0; i<mymtd->numeraseregions;i++){
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int j;
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for(j=0;j<mymtd->eraseregions[i].numblocks;j++){
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mymtd->unlock(mymtd,mymtd->eraseregions[i].offset + j * mymtd->eraseregions[i].erasesize,mymtd->eraseregions[i].erasesize);
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}
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}
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}
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#ifdef CONFIG_MTD_PARTITIONS
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nr_parts = parse_mtd_partitions(mymtd, probes, &parts, 0);
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if (nr_parts > 0) {
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add_mtd_partitions(mymtd, parts, nr_parts);
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return 0;
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}
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#endif
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/* No recognised partitioning schemes found - use defaults */
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nr_parts = epxa_default_partitions(mymtd, &parts);
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if (nr_parts > 0) {
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add_mtd_partitions(mymtd, parts, nr_parts);
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return 0;
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}
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/* If all else fails... */
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add_mtd_device(mymtd);
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return 0;
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}
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static void __exit epxa_mtd_cleanup(void)
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{
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if (mymtd) {
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if (nr_parts)
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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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map_destroy(mymtd);
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}
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if (epxa_map.virt) {
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iounmap((void *)epxa_map.virt);
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epxa_map.virt = 0;
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}
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}
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/*
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* This will do for now, once we decide which bootldr we're finally
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* going to use then we'll remove this function and do it properly
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*
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* Partions are currently (as offsets from base of flash):
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* 0x00000000 - 0x003FFFFF - bootloader (!)
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* 0x00400000 - 0x00FFFFFF - Flashdisk
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*/
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static int __init epxa_default_partitions(struct mtd_info *master, struct mtd_partition **pparts)
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{
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struct mtd_partition *parts;
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int ret, i;
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int npartitions = 0;
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char *names;
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const char *name = "jffs";
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printk("Using default partitions for %s\n",BOARD_NAME);
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npartitions=1;
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parts = kmalloc(npartitions*sizeof(*parts)+strlen(name), GFP_KERNEL);
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memzero(parts,npartitions*sizeof(*parts)+strlen(name));
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if (!parts) {
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ret = -ENOMEM;
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goto out;
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}
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i=0;
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names = (char *)&parts[npartitions];
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parts[i].name = names;
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names += strlen(name) + 1;
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strcpy(parts[i].name, name);
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#ifdef CONFIG_EPXA10DB
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parts[i].size = FLASH_SIZE-0x00400000;
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parts[i].offset = 0x00400000;
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#else
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parts[i].size = FLASH_SIZE-0x00180000;
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parts[i].offset = 0x00180000;
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#endif
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out:
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*pparts = parts;
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return npartitions;
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}
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module_init(epxa_mtd_init);
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module_exit(epxa_mtd_cleanup);
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MODULE_AUTHOR("Clive Davies");
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MODULE_DESCRIPTION("Altera epxa mtd flash map");
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MODULE_LICENSE("GPL");
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