drivers/mtd/maps/epxa10db-flash.c

   1 /*
   2  * Flash memory access on EPXA based devices
   3  *
   4  * (C) 2000 Nicolas Pitre <nico@cam.org>
   5  *  Copyright (C) 2001 Altera Corporation
   6  *  Copyright (C) 2001 Red Hat, Inc.
   7  *
   8  * $Id: epxa10db-flash.c,v 1.13 2004/11/04 13:24:14 gleixner Exp $
   9  *
  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.
  14  *
  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.
  19  *
  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
  23  */
  24
  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>
  30 #include <asm/io.h>
  31 #include <linux/mtd/mtd.h>
  32 #include <linux/mtd/map.h>
  33 #include <linux/mtd/partitions.h>
  34
  35 #include <asm/hardware.h>
  36 #ifdef CONFIG_EPXA10DB
  37 #define BOARD_NAME "EPXA10DB"
  38 #else
  39 #define BOARD_NAME "EPXA1DB"
  40 #endif
  41
  42 static int nr_parts = 0;
  43 static struct mtd_partition *parts;
  44
  45 static struct mtd_info *mymtd;
  46
  47 static int epxa_default_partitions(struct mtd_info *master, struct mtd_partition **pparts);
  48
  49
  50 static struct map_info epxa_map = {
  51         .name =         "EPXA flash",
  52         .size =         FLASH_SIZE,
  53         .bankwidth =    2,
  54         .phys =         FLASH_START,
  55 };
  56
  57 static const char *probes[] = { "RedBoot", "afs", NULL };
  58
  59 static int __init epxa_mtd_init(void)
  60 {
  61         int i;
  62
  63         printk(KERN_NOTICE "%s flash device: 0x%x at 0x%x\n", BOARD_NAME, FLASH_SIZE, FLASH_START);
  64
  65         epxa_map.virt = ioremap(FLASH_START, FLASH_SIZE);
  66         if (!epxa_map.virt) {
  67                 printk("Failed to ioremap %s flash\n",BOARD_NAME);
  68                 return -EIO;
  69         }
  70         simple_map_init(&epxa_map);
  71
  72         mymtd = do_map_probe("cfi_probe", &epxa_map);
  73         if (!mymtd) {
  74                 iounmap((void *)epxa_map.virt);
  75                 return -ENXIO;
  76         }
  77
  78         mymtd->owner = THIS_MODULE;
  79
  80         /* Unlock the flash device. */
  81         if(mymtd->unlock){
  82                 for (i=0; i<mymtd->numeraseregions;i++){
  83                         int j;
  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);
  86                         }
  87                 }
  88         }
  89
  90 #ifdef CONFIG_MTD_PARTITIONS
  91         nr_parts = parse_mtd_partitions(mymtd, probes, &parts, 0);
  92
  93         if (nr_parts > 0) {
  94                 add_mtd_partitions(mymtd, parts, nr_parts);
  95                 return 0;
  96         }
  97 #endif
  98         /* No recognised partitioning schemes found - use defaults */
  99         nr_parts = epxa_default_partitions(mymtd, &parts);
 100         if (nr_parts > 0) {
 101                 add_mtd_partitions(mymtd, parts, nr_parts);
 102                 return 0;
 103         }
 104
 105         /* If all else fails... */
 106         add_mtd_device(mymtd);
 107         return 0;
 108 }
 109
 110 static void __exit epxa_mtd_cleanup(void)
 111 {
 112         if (mymtd) {
 113                 if (nr_parts)
 114                         del_mtd_partitions(mymtd);
 115                 else
 116                         del_mtd_device(mymtd);
 117                 map_destroy(mymtd);
 118         }
 119         if (epxa_map.virt) {
 120                 iounmap((void *)epxa_map.virt);
 121                 epxa_map.virt = 0;
 122         }
 123 }
 124
 125
 126 /*
 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
 129  *
 130  * Partions are currently (as offsets from base of flash):
 131  * 0x00000000 - 0x003FFFFF - bootloader (!)
 132  * 0x00400000 - 0x00FFFFFF - Flashdisk
 133  */
 134
 135 static int __init epxa_default_partitions(struct mtd_info *master, struct mtd_partition **pparts)
 136 {
 137         struct mtd_partition *parts;
 138         int ret, i;
 139         int npartitions = 0;
 140         char *names;
 141         const char *name = "jffs";
 142
 143         printk("Using default partitions for %s\n",BOARD_NAME);
 144         npartitions=1;
 145         parts = kmalloc(npartitions*sizeof(*parts)+strlen(name), GFP_KERNEL);
 146         memzero(parts,npartitions*sizeof(*parts)+strlen(name));
 147         if (!parts) {
 148                 ret = -ENOMEM;
 149                 goto out;
 150         }
 151         i=0;
 152         names = (char *)&parts[npartitions];
 153         parts[i].name = names;
 154         names += strlen(name) + 1;
 155         strcpy(parts[i].name, name);
 156
 157 #ifdef CONFIG_EPXA10DB
 158         parts[i].size = FLASH_SIZE-0x00400000;
 159         parts[i].offset = 0x00400000;
 160 #else
 161         parts[i].size = FLASH_SIZE-0x00180000;
 162         parts[i].offset = 0x00180000;
 163 #endif
 164
 165  out:
 166         *pparts = parts;
 167         return npartitions;
 168 }
 169
 170
 171 module_init(epxa_mtd_init);
 172 module_exit(epxa_mtd_cleanup);
 173
 174 MODULE_AUTHOR("Clive Davies");
 175 MODULE_DESCRIPTION("Altera epxa mtd flash map");
 176 MODULE_LICENSE("GPL");