drivers/mtd/maps/cfi_flagadm.c

   1 /*
   2  *  Copyright © 2001 Flaga hf. Medical Devices, Kári Davíðsson <kd@flaga.is>
   3  *
   4  *  $Id: cfi_flagadm.c,v 1.15 2005/11/07 11:14:26 gleixner Exp $
   5  *
   6  *  This program is free software; you can redistribute  it and/or modify it
   7  *  under  the terms of  the GNU General  Public License as published by the
   8  *  Free Software Foundation;  either version 2 of the  License, or (at your
   9  *  option) any later version.
  10  *
  11  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  12  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  13  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  14  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  15  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  16  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  17  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  18  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  19  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  20  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  21  *
  22  *  You should have received a copy of the  GNU General Public License along
  23  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  24  *  675 Mass Ave, Cambridge, MA 02139, USA.
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/types.h>
  29 #include <linux/kernel.h>
  30 #include <linux/init.h>
  31 #include <asm/io.h>
  32 #include <linux/mtd/mtd.h>
  33 #include <linux/mtd/map.h>
  34 #include <linux/mtd/partitions.h>
  35
  36
  37 /* We split the flash chip up into four parts.
  38  * 1: bootloader firts 128k                     (0x00000000 - 0x0001FFFF) size 0x020000
  39  * 2: kernel 640k                                       (0x00020000 - 0x000BFFFF) size 0x0A0000
  40  * 3: compressed 1536k root ramdisk     (0x000C0000 - 0x0023FFFF) size 0x180000
  41  * 4: writeable diskpartition (jffs)(0x00240000 - 0x003FFFFF) size 0x1C0000
  42  */
  43
  44 #define FLASH_PHYS_ADDR 0x40000000
  45 #define FLASH_SIZE 0x400000
  46
  47 #define FLASH_PARTITION0_ADDR 0x00000000
  48 #define FLASH_PARTITION0_SIZE 0x00020000
  49
  50 #define FLASH_PARTITION1_ADDR 0x00020000
  51 #define FLASH_PARTITION1_SIZE 0x000A0000
  52
  53 #define FLASH_PARTITION2_ADDR 0x000C0000
  54 #define FLASH_PARTITION2_SIZE 0x00180000
  55
  56 #define FLASH_PARTITION3_ADDR 0x00240000
  57 #define FLASH_PARTITION3_SIZE 0x001C0000
  58
  59
  60 struct map_info flagadm_map = {
  61                 .name =         "FlagaDM flash device",
  62                 .size =         FLASH_SIZE,
  63                 .bankwidth =    2,
  64 };
  65
  66 struct mtd_partition flagadm_parts[] = {
  67         {
  68                 .name =         "Bootloader",
  69                 .offset =       FLASH_PARTITION0_ADDR,
  70                 .size =         FLASH_PARTITION0_SIZE
  71         },
  72         {
  73                 .name =         "Kernel image",
  74                 .offset =       FLASH_PARTITION1_ADDR,
  75                 .size =         FLASH_PARTITION1_SIZE
  76         },
  77         {
  78                 .name =         "Initial ramdisk image",
  79                 .offset =       FLASH_PARTITION2_ADDR,
  80                 .size =         FLASH_PARTITION2_SIZE
  81         },
  82         {
  83                 .name =         "Persistent storage",
  84                 .offset =       FLASH_PARTITION3_ADDR,
  85                 .size =         FLASH_PARTITION3_SIZE
  86         }
  87 };
  88
  89 #define PARTITION_COUNT ARRAY_SIZE(flagadm_parts)
  90
  91 static struct mtd_info *mymtd;
  92
  93 int __init init_flagadm(void)
  94 {
  95         printk(KERN_NOTICE "FlagaDM flash device: %x at %x\n",
  96                         FLASH_SIZE, FLASH_PHYS_ADDR);
  97
  98         flagadm_map.phys = FLASH_PHYS_ADDR;
  99         flagadm_map.virt = ioremap(FLASH_PHYS_ADDR,
 100                                         FLASH_SIZE);
 101
 102         if (!flagadm_map.virt) {
 103                 printk("Failed to ioremap\n");
 104                 return -EIO;
 105         }
 106
 107         simple_map_init(&flagadm_map);
 108
 109         mymtd = do_map_probe("cfi_probe", &flagadm_map);
 110         if (mymtd) {
 111                 mymtd->owner = THIS_MODULE;
 112                 add_mtd_partitions(mymtd, flagadm_parts, PARTITION_COUNT);
 113                 printk(KERN_NOTICE "FlagaDM flash device initialized\n");
 114                 return 0;
 115         }
 116
 117         iounmap((void *)flagadm_map.virt);
 118         return -ENXIO;
 119 }
 120
 121 static void __exit cleanup_flagadm(void)
 122 {
 123         if (mymtd) {
 124                 del_mtd_partitions(mymtd);
 125                 map_destroy(mymtd);
 126         }
 127         if (flagadm_map.virt) {
 128                 iounmap((void *)flagadm_map.virt);
 129                 flagadm_map.virt = 0;
 130         }
 131 }
 132
 133 module_init(init_flagadm);
 134 module_exit(cleanup_flagadm);
 135
 136
 137 MODULE_LICENSE("GPL");
 138 MODULE_AUTHOR("Kári Davíðsson <kd@flaga.is>");
 139 MODULE_DESCRIPTION("MTD map driver for Flaga digital module");