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 1.3 2004/09/16 23:27:13 gleixner Exp $
   9  */
  10
  11 #include <linux/config.h>
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/kernel.h>
  15
  16 #include <linux/errno.h>
  17 #include <linux/init.h>
  18
  19 #include <linux/mtd/mtd.h>
  20 #include <linux/mtd/map.h>
  21 #include <linux/mtd/partitions.h>
  22
  23 #include <asm/hardware.h>
  24 #include <asm/io.h>
  25
  26
  27 #ifndef CONFIG_ARCH_OMAP
  28 #error This is for OMAP architecture only
  29 #endif
  30
  31 //these lines need be moved to a hardware header file
  32 #define OMAP_TOTO_FLASH_BASE 0xd8000000
  33 #define OMAP_TOTO_FLASH_SIZE 0x80000
  34
  35 static struct map_info omap_toto_map_flash = {
  36         .name =         "OMAP Toto flash",
  37         .bankwidth =    2,
  38         .virt =         (void __iomem *)OMAP_TOTO_FLASH_BASE,
  39 };
  40
  41
  42 static struct mtd_partition toto_flash_partitions[] = {
  43         {
  44                 .name =         "BootLoader",
  45                 .size =         0x00040000,     /* hopefully u-boot will stay 128k + 128*/
  46                 .offset =       0,
  47                 .mask_flags =   MTD_WRITEABLE,  /* force read-only */
  48         }, {
  49                 .name =         "ReservedSpace",
  50                 .size =         0x00030000,
  51                 .offset =       MTDPART_OFS_APPEND,
  52                 //mask_flags:   MTD_WRITEABLE,  /* force read-only */
  53         }, {
  54                 .name =         "EnvArea",      /* bottom 64KiB for env vars */
  55                 .size =         MTDPART_SIZ_FULL,
  56                 .offset =       MTDPART_OFS_APPEND,
  57         }
  58 };
  59
  60 static struct mtd_partition *parsed_parts;
  61
  62 static struct mtd_info *flash_mtd;
  63
  64 static int __init init_flash (void)
  65 {
  66
  67         struct mtd_partition *parts;
  68         int nb_parts = 0;
  69         int parsed_nr_parts = 0;
  70         const char *part_type;
  71
  72         /*
  73          * Static partition definition selection
  74          */
  75         part_type = "static";
  76
  77         parts = toto_flash_partitions;
  78         nb_parts = ARRAY_SIZE(toto_flash_partitions);
  79         omap_toto_map_flash.size = OMAP_TOTO_FLASH_SIZE;
  80         omap_toto_map_flash.phys = virt_to_phys(OMAP_TOTO_FLASH_BASE);
  81
  82         simple_map_init(&omap_toto_map_flash);
  83         /*
  84          * Now let's probe for the actual flash.  Do it here since
  85          * specific machine settings might have been set above.
  86          */
  87         printk(KERN_NOTICE "OMAP toto flash: probing %d-bit flash bus\n",
  88                 omap_toto_map_flash.bankwidth*8);
  89         flash_mtd = do_map_probe("jedec_probe", &omap_toto_map_flash);
  90         if (!flash_mtd)
  91                 return -ENXIO;
  92
  93         if (parsed_nr_parts > 0) {
  94                 parts = parsed_parts;
  95                 nb_parts = parsed_nr_parts;
  96         }
  97
  98         if (nb_parts == 0) {
  99                 printk(KERN_NOTICE "OMAP toto flash: no partition info available,"
 100                         "registering whole flash at once\n");
 101                 if (add_mtd_device(flash_mtd)){
 102             return -ENXIO;
 103         }
 104         } else {
 105                 printk(KERN_NOTICE "Using %s partition definition\n",
 106                         part_type);
 107                 return add_mtd_partitions(flash_mtd, parts, nb_parts);
 108         }
 109         return 0;
 110 }
 111
 112 int __init omap_toto_mtd_init(void)
 113 {
 114         int status;
 115
 116         if (status = init_flash()) {
 117                 printk(KERN_ERR "OMAP Toto Flash: unable to init map for toto flash\n");
 118         }
 119     return status;
 120 }
 121
 122 static void  __exit omap_toto_mtd_cleanup(void)
 123 {
 124         if (flash_mtd) {
 125                 del_mtd_partitions(flash_mtd);
 126                 map_destroy(flash_mtd);
 127                 if (parsed_parts)
 128                         kfree(parsed_parts);
 129         }
 130 }
 131
 132 module_init(omap_toto_mtd_init);
 133 module_exit(omap_toto_mtd_cleanup);
 134
 135 MODULE_AUTHOR("Jian Zhang");
 136 MODULE_DESCRIPTION("OMAP Toto board map driver");
 137 MODULE_LICENSE("GPL");