linux/drivers/mtd/maps/cfi_flagadm.c
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   1/*
   2 *  Copyright \xC2\xA9 2001 Flaga hf. Medical Devices, K\xC3\xA1ri Dav\xC3\xAD\xC3\xB0sson <kd@flaga.is>
   3 *
   4 *  This program is free software; you can redistribute  it and/or modify it
   5 *  under  the terms of  the GNU General  Public License as published by the
   6 *  Free Software Foundation;  either version 2 of the  License, or (at your
   7 *  option) any later version.
   8 *
   9 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  10 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  11 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  12 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  13 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  14 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  15 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  16 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  17 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  18 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  19 *
  20 *  You should have received a copy of the  GNU General Public License along
  21 *  with this program; if not, write  to the Free Software Foundation, Inc.,
  22 *  675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25#include <linux/module.h>
  26#include <linux/types.h>
  27#include <linux/kernel.h>
  28#include <linux/init.h>
  29#include <asm/io.h>
  30#include <linux/mtd/mtd.h>
  31#include <linux/mtd/map.h>
  32#include <linux/mtd/partitions.h>
  33
  34
  35/* We split the flash chip up into four parts.
  36 * 1: bootloader first 128k                     (0x00000000 - 0x0001FFFF) size 0x020000
  37 * 2: kernel 640k                                       (0x00020000 - 0x000BFFFF) size 0x0A0000
  38 * 3: compressed 1536k root ramdisk     (0x000C0000 - 0x0023FFFF) size 0x180000
  39 * 4: writeable diskpartition (jffs)(0x00240000 - 0x003FFFFF) size 0x1C0000
  40 */
  41
  42#define FLASH_PHYS_ADDR 0x40000000
  43#define FLASH_SIZE 0x400000
  44
  45#define FLASH_PARTITION0_ADDR 0x00000000
  46#define FLASH_PARTITION0_SIZE 0x00020000
  47
  48#define FLASH_PARTITION1_ADDR 0x00020000
  49#define FLASH_PARTITION1_SIZE 0x000A0000
  50
  51#define FLASH_PARTITION2_ADDR 0x000C0000
  52#define FLASH_PARTITION2_SIZE 0x00180000
  53
  54#define FLASH_PARTITION3_ADDR 0x00240000
  55#define FLASH_PARTITION3_SIZE 0x001C0000
  56
  57
  58static struct map_info flagadm_map = {
  59                .name =         "FlagaDM flash device",
  60                .size =         FLASH_SIZE,
  61                .bankwidth =    2,
  62};
  63
  64static const struct mtd_partition flagadm_parts[] = {
  65        {
  66                .name =         "Bootloader",
  67                .offset =       FLASH_PARTITION0_ADDR,
  68                .size =         FLASH_PARTITION0_SIZE
  69        },
  70        {
  71                .name =         "Kernel image",
  72                .offset =       FLASH_PARTITION1_ADDR,
  73                .size =         FLASH_PARTITION1_SIZE
  74        },
  75        {
  76                .name =         "Initial ramdisk image",
  77                .offset =       FLASH_PARTITION2_ADDR,
  78                .size =         FLASH_PARTITION2_SIZE
  79        },
  80        {
  81                .name =         "Persistent storage",
  82                .offset =       FLASH_PARTITION3_ADDR,
  83                .size =         FLASH_PARTITION3_SIZE
  84        }
  85};
  86
  87#define PARTITION_COUNT ARRAY_SIZE(flagadm_parts)
  88
  89static struct mtd_info *mymtd;
  90
  91static int __init init_flagadm(void)
  92{
  93        printk(KERN_NOTICE "FlagaDM flash device: %x at %x\n",
  94                        FLASH_SIZE, FLASH_PHYS_ADDR);
  95
  96        flagadm_map.phys = FLASH_PHYS_ADDR;
  97        flagadm_map.virt = ioremap(FLASH_PHYS_ADDR,
  98                                        FLASH_SIZE);
  99
 100        if (!flagadm_map.virt) {
 101                printk("Failed to ioremap\n");
 102                return -EIO;
 103        }
 104
 105        simple_map_init(&flagadm_map);
 106
 107        mymtd = do_map_probe("cfi_probe", &flagadm_map);
 108        if (mymtd) {
 109                mymtd->owner = THIS_MODULE;
 110                mtd_device_register(mymtd, flagadm_parts, PARTITION_COUNT);
 111                printk(KERN_NOTICE "FlagaDM flash device initialized\n");
 112                return 0;
 113        }
 114
 115        iounmap((void __iomem *)flagadm_map.virt);
 116        return -ENXIO;
 117}
 118
 119static void __exit cleanup_flagadm(void)
 120{
 121        if (mymtd) {
 122                mtd_device_unregister(mymtd);
 123                map_destroy(mymtd);
 124        }
 125        if (flagadm_map.virt) {
 126                iounmap((void __iomem *)flagadm_map.virt);
 127                flagadm_map.virt = NULL;
 128        }
 129}
 130
 131module_init(init_flagadm);
 132module_exit(cleanup_flagadm);
 133
 134
 135MODULE_LICENSE("GPL");
 136MODULE_AUTHOR("K\xC3\xA1ri Dav\xC3\xAD\xC3\xB0sson <kd@flaga.is>");
 137MODULE_DESCRIPTION("MTD map driver for Flaga digital module");
 138