release/src-rt-6.x/linux/linux-2.6/drivers/mtd/maps/dbox2-flash.c

   1 /*
   2  * $Id: dbox2-flash.c,v 1.14 2005/11/07 11:14:26 gleixner Exp $
   3  *
   4  * D-Box 2 flash driver
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <asm/io.h>
  12 #include <linux/mtd/mtd.h>
  13 #include <linux/mtd/map.h>
  14 #include <linux/mtd/partitions.h>
  15 #include <linux/errno.h>
  16
  17 /* partition_info gives details on the logical partitions that the split the
  18  * single flash device into. If the size if zero we use up to the end of the
  19  * device. */
  20 static struct mtd_partition partition_info[]= {
  21         {
  22         .name           = "BR bootloader",
  23         .size           = 128 * 1024,
  24         .offset         = 0,
  25         .mask_flags     = MTD_WRITEABLE
  26         },
  27         {
  28         .name           = "FLFS (U-Boot)",
  29         .size           = 128 * 1024,
  30         .offset         = MTDPART_OFS_APPEND,
  31         .mask_flags     = 0
  32         },
  33         {
  34         .name           = "Root (SquashFS)",
  35         .size           = 7040 * 1024,
  36         .offset         = MTDPART_OFS_APPEND,
  37         .mask_flags     = 0
  38         },
  39         {
  40         .name           = "var (JFFS2)",
  41         .size           = 896 * 1024,
  42         .offset         = MTDPART_OFS_APPEND,
  43         .mask_flags     = 0
  44         },
  45         {
  46         .name           = "Flash without bootloader",
  47         .size           = MTDPART_SIZ_FULL,
  48         .offset         = 128 * 1024,
  49         .mask_flags     = 0
  50         },
  51         {
  52         .name           = "Complete Flash",
  53         .size           = MTDPART_SIZ_FULL,
  54         .offset         = 0,
  55         .mask_flags     = MTD_WRITEABLE
  56         }
  57 };
  58
  59 #define NUM_PARTITIONS ARRAY_SIZE(partition_info)
  60
  61 #define WINDOW_ADDR 0x10000000
  62 #define WINDOW_SIZE 0x800000
  63
  64 static struct mtd_info *mymtd;
  65
  66
  67 struct map_info dbox2_flash_map = {
  68         .name           = "D-Box 2 flash memory",
  69         .size           = WINDOW_SIZE,
  70         .bankwidth      = 4,
  71         .phys           = WINDOW_ADDR,
  72 };
  73
  74 int __init init_dbox2_flash(void)
  75 {
  76         printk(KERN_NOTICE "D-Box 2 flash driver (size->0x%X mem->0x%X)\n", WINDOW_SIZE, WINDOW_ADDR);
  77         dbox2_flash_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);
  78
  79         if (!dbox2_flash_map.virt) {
  80                 printk("Failed to ioremap\n");
  81                 return -EIO;
  82         }
  83         simple_map_init(&dbox2_flash_map);
  84
  85         // Probe for dual Intel 28F320 or dual AMD
  86         mymtd = do_map_probe("cfi_probe", &dbox2_flash_map);
  87         if (!mymtd) {
  88             // Probe for single Intel 28F640
  89             dbox2_flash_map.bankwidth = 2;
  90
  91             mymtd = do_map_probe("cfi_probe", &dbox2_flash_map);
  92         }
  93
  94         if (mymtd) {
  95                 mymtd->owner = THIS_MODULE;
  96
  97                 /* Create MTD devices for each partition. */
  98                 add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);
  99
 100                 return 0;
 101         }
 102
 103         iounmap((void *)dbox2_flash_map.virt);
 104         return -ENXIO;
 105 }
 106
 107 static void __exit cleanup_dbox2_flash(void)
 108 {
 109         if (mymtd) {
 110                 del_mtd_partitions(mymtd);
 111                 map_destroy(mymtd);
 112         }
 113         if (dbox2_flash_map.virt) {
 114                 iounmap((void *)dbox2_flash_map.virt);
 115                 dbox2_flash_map.virt = 0;
 116         }
 117 }
 118
 119 module_init(init_dbox2_flash);
 120 module_exit(cleanup_dbox2_flash);
 121
 122
 123 MODULE_LICENSE("GPL");
 124 MODULE_AUTHOR("Kári Davíðsson <kd@flaga.is>, Bastian Blank <waldi@tuxbox.org>, Alexander Wild <wild@te-elektronik.com>");
 125 MODULE_DESCRIPTION("MTD map driver for D-Box 2 board");