drivers/mtd/maps/w315.c

   1 /*
   2  *      History:
   3  *      Date            Author                  Comment
   4  *      11-15-2005      Victor Yu.              Create it.
   5  */
   6
   7 #include <linux/config.h>
   8 #include <linux/module.h>
   9 #include <linux/types.h>
  10 #include <linux/kernel.h>
  11
  12 #include <linux/errno.h>
  13 #include <linux/init.h>
  14
  15 #include <linux/mtd/mtd.h>
  16 #include <linux/mtd/map.h>
  17 #include <linux/mtd/partitions.h>
  18 #include <linux/reboot.h>
  19
  20 #include <asm/hardware.h>
  21 #include <asm/io.h>
  22
  23 static struct map_info mcpu_map_flash = {
  24         .name           = "W315",
  25         .bankwidth      = 2,
  26         .phys           = CPE_FLASH_BASE,
  27         .size           = CPE_FLASH_SZ,
  28         .virt           = CPE_FLASH_VA_BASE,
  29 };
  30
  31 #define BOOT_LOADER_SIZE        0x40000
  32 #define KERNEL_BOOT_LOADER_SIZE 0x200000
  33 #define KERNEL_SIZE             (KERNEL_BOOT_LOADER_SIZE-BOOT_LOADER_SIZE)
  34 #define ROOT_DISK_SIZE          0x800000
  35 #define USER_DISK_SIZE          (CPE_FLASH_SZ-KERNEL_BOOT_LOADER_SIZE-ROOT_DISK_SIZE)
  36 static struct mtd_partition mcpu_flash_partitions[] = {
  37         {
  38                 .name =         "BootLoader",
  39                 .size =         BOOT_LOADER_SIZE,/* hopefully Moxa boot will stay 128k + 128*/
  40                 .offset =       0,
  41                 //.mask_flags = MTD_WRITEABLE,  /* force read-only */
  42         }, {
  43                 .name =         "Kernel",
  44                 .size =         KERNEL_SIZE,
  45                 .offset =       MTDPART_OFS_APPEND,
  46                 //.mask_flags = MTD_WRITEABLE,  /* force read-only */
  47         }, {
  48                 .name =         "RootDisk",
  49                 .size =         ROOT_DISK_SIZE,
  50                 .offset =       MTDPART_OFS_APPEND,
  51                 //.mask_flags = MTD_WRITEABLE,  /* force read-only */
  52         }, {
  53                 .name =         "UserDisk",
  54                 .size =         USER_DISK_SIZE,
  55                 .offset =       MTDPART_OFS_APPEND,
  56                 //.mask_flags = MTD_WRITEABLE,
  57         }
  58 };
  59
  60 static int mtd_reboot(struct notifier_block *n, unsigned long code, void *p)
  61 {
  62         if(code != SYS_RESTART)
  63                 return NOTIFY_DONE;
  64
  65         //Added by Wade ,06/19/09
  66         *( u16 *)(CPE_FLASH_VA_BASE + (0x55 * 2)) = 0xb0;
  67         *( u16 *)(CPE_FLASH_VA_BASE + (0x55 * 2)) = 0xff;
  68         return NOTIFY_DONE;
  69 }
  70
  71 static struct notifier_block mtd_notifier = {
  72         notifier_call:  mtd_reboot,
  73         next:           NULL,
  74         priority:       0
  75 };
  76
  77 static struct mtd_info *flash_mtd;
  78
  79 static int __init init_flash (void)
  80 {
  81
  82         /*
  83          * Static partition definition selection
  84          */
  85         simple_map_init(&mcpu_map_flash);
  86
  87         /*
  88          * Now let's probe for the actual flash.  Do it here since
  89          * specific machine settings might have been set above.
  90          */
  91         printk(KERN_NOTICE "Moxa CPU flash: probing %d-bit flash bus\n",
  92                 mcpu_map_flash.bankwidth*8);
  93         flash_mtd = do_map_probe("cfi_probe", &mcpu_map_flash);
  94         if (!flash_mtd)
  95                 return -ENXIO;
  96
  97         printk(KERN_NOTICE "Using static partition definition\n");
  98         return add_mtd_partitions(flash_mtd, mcpu_flash_partitions, ARRAY_SIZE(mcpu_flash_partitions));
  99 }
 100
 101 int __init mcpu_mtd_init(void)
 102 {
 103         int status;
 104
 105         if ((status = init_flash())) {
 106                 printk(KERN_ERR "Flash: unable to init map for flash\n");
 107         } else {
 108                 register_reboot_notifier(&mtd_notifier);
 109         }
 110         return status;
 111 }
 112
 113 static void  __exit mcpu_mtd_cleanup(void)
 114 {
 115         if (flash_mtd) {
 116                 unregister_reboot_notifier(&mtd_notifier);
 117                 del_mtd_partitions(flash_mtd);
 118                 map_destroy(flash_mtd);
 119         }
 120 }
 121
 122 module_init(mcpu_mtd_init);
 123 module_exit(mcpu_mtd_cleanup);
 124
 125 MODULE_AUTHOR("Victor Yu.");
 126 MODULE_DESCRIPTION("Moxa CPU board MTD device driver");
 127 MODULE_LICENSE("GPL");