drivers/mtd/maps/dbox2-flash.c

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