drivers/mtd/maps/omap-toto-flash.c

   1 /*
   2  * NOR Flash memory access on TI Toto board
   3  *
   4  * jzhang@ti.com (C) 2003 Texas Instruments.
   5  *
   6  *  (C) 2002 MontVista Software, Inc.
   7  *
   8  * $Id: omap-toto-flash.c,v 1.5 2005/11/07 11:14:27 gleixner Exp $
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/kernel.h>
  14 #include <linux/errno.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/map.h>
  20 #include <linux/mtd/partitions.h>
  21
  22 #include <asm/hardware.h>
  23 #include <asm/io.h>
  24
  25
  26 #ifndef CONFIG_ARCH_OMAP
  27 #error This is for OMAP architecture only
  28 #endif
  29
  30 //these lines need be moved to a hardware header file
  31 #define OMAP_TOTO_FLASH_BASE 0xd8000000
  32 #define OMAP_TOTO_FLASH_SIZE 0x80000
  33
  34 static struct map_info omap_toto_map_flash = {
  35         .name =         "OMAP Toto flash",
  36         .bankwidth =    2,
  37         .virt =         (void __iomem *)OMAP_TOTO_FLASH_BASE,
  38 };
  39
  40
  41 static struct mtd_partition toto_flash_partitions[] = {
  42         {
  43                 .name =         "BootLoader",
  44                 .size =         0x00040000,     /* hopefully u-boot will stay 128k + 128*/
  45                 .offset =       0,
  46                 .mask_flags =   MTD_WRITEABLE,  /* force read-only */
  47         }, {
  48                 .name =         "ReservedSpace",
  49                 .size =         0x00030000,
  50                 .offset =       MTDPART_OFS_APPEND,
  51                 //mask_flags:   MTD_WRITEABLE,  /* force read-only */
  52         }, {
  53                 .name =         "EnvArea",      /* bottom 64KiB for env vars */
  54                 .size =         MTDPART_SIZ_FULL,
  55                 .offset =       MTDPART_OFS_APPEND,
  56         }
  57 };
  58
  59 static struct mtd_partition *parsed_parts;
  60
  61 static struct mtd_info *flash_mtd;
  62
  63 static int __init init_flash (void)
  64 {
  65
  66         struct mtd_partition *parts;
  67         int nb_parts = 0;
  68         int parsed_nr_parts = 0;
  69         const char *part_type;
  70
  71         /*
  72          * Static partition definition selection
  73          */
  74         part_type = "static";
  75
  76         parts = toto_flash_partitions;
  77         nb_parts = ARRAY_SIZE(toto_flash_partitions);
  78         omap_toto_map_flash.size = OMAP_TOTO_FLASH_SIZE;
  79         omap_toto_map_flash.phys = virt_to_phys(OMAP_TOTO_FLASH_BASE);
  80
  81         simple_map_init(&omap_toto_map_flash);
  82         /*
  83          * Now let's probe for the actual flash.  Do it here since
  84          * specific machine settings might have been set above.
  85          */
  86         printk(KERN_NOTICE "OMAP toto flash: probing %d-bit flash bus\n",
  87                 omap_toto_map_flash.bankwidth*8);
  88         flash_mtd = do_map_probe("jedec_probe", &omap_toto_map_flash);
  89         if (!flash_mtd)
  90                 return -ENXIO;
  91
  92         if (parsed_nr_parts > 0) {
  93                 parts = parsed_parts;
  94                 nb_parts = parsed_nr_parts;
  95         }
  96
  97         if (nb_parts == 0) {
  98                 printk(KERN_NOTICE "OMAP toto flash: no partition info available,"
  99                         "registering whole flash at once\n");
 100                 if (add_mtd_device(flash_mtd)){
 101             return -ENXIO;
 102         }
 103         } else {
 104                 printk(KERN_NOTICE "Using %s partition definition\n",
 105                         part_type);
 106                 return add_mtd_partitions(flash_mtd, parts, nb_parts);
 107         }
 108         return 0;
 109 }
 110
 111 int __init omap_toto_mtd_init(void)
 112 {
 113         int status;
 114
 115         if (status = init_flash()) {
 116                 printk(KERN_ERR "OMAP Toto Flash: unable to init map for toto flash\n");
 117         }
 118     return status;
 119 }
 120
 121 static void  __exit omap_toto_mtd_cleanup(void)
 122 {
 123         if (flash_mtd) {
 124                 del_mtd_partitions(flash_mtd);
 125                 map_destroy(flash_mtd);
 126                 kfree(parsed_parts);
 127         }
 128 }
 129
 130 module_init(omap_toto_mtd_init);
 131 module_exit(omap_toto_mtd_cleanup);
 132
 133 MODULE_AUTHOR("Jian Zhang");
 134 MODULE_DESCRIPTION("OMAP Toto board map driver");
 135 MODULE_LICENSE("GPL");