2 * Flash memory access on EPXA based devices
4 * (C) 2000 Nicolas Pitre <nico@cam.org>
5 * Copyright (C) 2001 Altera Corporation
6 * Copyright (C) 2001 Red Hat, Inc.
8 * $Id: epxa10db-flash.c,v 1.13 2004/11/04 13:24:14 gleixner Exp $
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <linux/config.h>
26 #include <linux/module.h>
27 #include <linux/types.h>
28 #include <linux/kernel.h>
29 #include <linux/init.h>
31 #include <linux/mtd/mtd.h>
32 #include <linux/mtd/map.h>
33 #include <linux/mtd/partitions.h>
35 #include <asm/hardware.h>
36 #ifdef CONFIG_EPXA10DB
37 #define BOARD_NAME "EPXA10DB"
39 #define BOARD_NAME "EPXA1DB"
42 static int nr_parts = 0;
43 static struct mtd_partition *parts;
45 static struct mtd_info *mymtd;
47 static int epxa_default_partitions(struct mtd_info *master, struct mtd_partition **pparts);
50 static struct map_info epxa_map = {
57 static const char *probes[] = { "RedBoot", "afs", NULL };
59 static int __init epxa_mtd_init(void)
63 printk(KERN_NOTICE "%s flash device: 0x%x at 0x%x\n", BOARD_NAME, FLASH_SIZE, FLASH_START);
65 epxa_map.virt = ioremap(FLASH_START, FLASH_SIZE);
67 printk("Failed to ioremap %s flash\n",BOARD_NAME);
70 simple_map_init(&epxa_map);
72 mymtd = do_map_probe("cfi_probe", &epxa_map);
74 iounmap((void *)epxa_map.virt);
78 mymtd->owner = THIS_MODULE;
80 /* Unlock the flash device. */
82 for (i=0; i<mymtd->numeraseregions;i++){
84 for(j=0;j<mymtd->eraseregions[i].numblocks;j++){
85 mymtd->unlock(mymtd,mymtd->eraseregions[i].offset + j * mymtd->eraseregions[i].erasesize,mymtd->eraseregions[i].erasesize);
90 #ifdef CONFIG_MTD_PARTITIONS
91 nr_parts = parse_mtd_partitions(mymtd, probes, &parts, 0);
94 add_mtd_partitions(mymtd, parts, nr_parts);
98 /* No recognised partitioning schemes found - use defaults */
99 nr_parts = epxa_default_partitions(mymtd, &parts);
101 add_mtd_partitions(mymtd, parts, nr_parts);
105 /* If all else fails... */
106 add_mtd_device(mymtd);
110 static void __exit epxa_mtd_cleanup(void)
114 del_mtd_partitions(mymtd);
116 del_mtd_device(mymtd);
120 iounmap((void *)epxa_map.virt);
127 * This will do for now, once we decide which bootldr we're finally
128 * going to use then we'll remove this function and do it properly
130 * Partions are currently (as offsets from base of flash):
131 * 0x00000000 - 0x003FFFFF - bootloader (!)
132 * 0x00400000 - 0x00FFFFFF - Flashdisk
135 static int __init epxa_default_partitions(struct mtd_info *master, struct mtd_partition **pparts)
137 struct mtd_partition *parts;
141 const char *name = "jffs";
143 printk("Using default partitions for %s\n",BOARD_NAME);
145 parts = kmalloc(npartitions*sizeof(*parts)+strlen(name), GFP_KERNEL);
146 memzero(parts,npartitions*sizeof(*parts)+strlen(name));
152 names = (char *)&parts[npartitions];
153 parts[i].name = names;
154 names += strlen(name) + 1;
155 strcpy(parts[i].name, name);
157 #ifdef CONFIG_EPXA10DB
158 parts[i].size = FLASH_SIZE-0x00400000;
159 parts[i].offset = 0x00400000;
161 parts[i].size = FLASH_SIZE-0x00180000;
162 parts[i].offset = 0x00180000;
171 module_init(epxa_mtd_init);
172 module_exit(epxa_mtd_cleanup);
174 MODULE_AUTHOR("Clive Davies");
175 MODULE_DESCRIPTION("Altera epxa mtd flash map");
176 MODULE_LICENSE("GPL");