drivers/mtd/maps/alchemy-flash.c

   1 /*
   2  * Flash memory access on AMD Alchemy evaluation boards
   3  *
   4  * $Id: alchemy-flash.c,v 1.2 2005/11/07 11:14:26 gleixner Exp $
   5  *
   6  * (C) 2003, 2004 Pete Popov <ppopov@embeddedalley.com>
   7  *
   8  */
   9
  10 #include <linux/config.h>
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/kernel.h>
  15
  16 #include <linux/mtd/mtd.h>
  17 #include <linux/mtd/map.h>
  18 #include <linux/mtd/partitions.h>
  19
  20 #include <asm/io.h>
  21
  22 #ifdef  DEBUG_RW
  23 #define DBG(x...)       printk(x)
  24 #else
  25 #define DBG(x...)
  26 #endif
  27
  28 #ifdef CONFIG_MIPS_PB1000
  29 #define BOARD_MAP_NAME "Pb1000 Flash"
  30 #define BOARD_FLASH_SIZE 0x00800000 /* 8MB */
  31 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  32 #endif
  33
  34 #ifdef CONFIG_MIPS_PB1500
  35 #define BOARD_MAP_NAME "Pb1500 Flash"
  36 #define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
  37 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  38 #endif
  39
  40 #ifdef CONFIG_MIPS_PB1100
  41 #define BOARD_MAP_NAME "Pb1100 Flash"
  42 #define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
  43 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  44 #endif
  45
  46 #ifdef CONFIG_MIPS_PB1550
  47 #define BOARD_MAP_NAME "Pb1550 Flash"
  48 #define BOARD_FLASH_SIZE 0x08000000 /* 128MB */
  49 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  50 #endif
  51
  52 #ifdef CONFIG_MIPS_PB1200
  53 #define BOARD_MAP_NAME "Pb1200 Flash"
  54 #define BOARD_FLASH_SIZE 0x08000000 /* 128MB */
  55 #define BOARD_FLASH_WIDTH 2 /* 16-bits */
  56 #endif
  57
  58 #ifdef CONFIG_MIPS_DB1000
  59 #define BOARD_MAP_NAME "Db1000 Flash"
  60 #define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
  61 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  62 #endif
  63
  64 #ifdef CONFIG_MIPS_DB1500
  65 #define BOARD_MAP_NAME "Db1500 Flash"
  66 #define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
  67 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  68 #endif
  69
  70 #ifdef CONFIG_MIPS_DB1100
  71 #define BOARD_MAP_NAME "Db1100 Flash"
  72 #define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
  73 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  74 #endif
  75
  76 #ifdef CONFIG_MIPS_DB1550
  77 #define BOARD_MAP_NAME "Db1550 Flash"
  78 #define BOARD_FLASH_SIZE 0x08000000 /* 128MB */
  79 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  80 #endif
  81
  82 #ifdef CONFIG_MIPS_DB1200
  83 #define BOARD_MAP_NAME "Db1200 Flash"
  84 #define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
  85 #define BOARD_FLASH_WIDTH 2 /* 16-bits */
  86 #endif
  87
  88 #ifdef CONFIG_MIPS_HYDROGEN3
  89 #define BOARD_MAP_NAME "Hydrogen3 Flash"
  90 #define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
  91 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  92 #define USE_LOCAL_ACCESSORS /* why? */
  93 #endif
  94
  95 #ifdef CONFIG_MIPS_BOSPORUS
  96 #define BOARD_MAP_NAME "Bosporus Flash"
  97 #define BOARD_FLASH_SIZE 0x01000000 /* 16MB */
  98 #define BOARD_FLASH_WIDTH 2 /* 16-bits */
  99 #endif
 100
 101 #ifdef CONFIG_MIPS_MIRAGE
 102 #define BOARD_MAP_NAME "Mirage Flash"
 103 #define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
 104 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
 105 #define USE_LOCAL_ACCESSORS /* why? */
 106 #endif
 107
 108 static struct map_info alchemy_map = {
 109         .name = BOARD_MAP_NAME,
 110 };
 111
 112 static struct mtd_partition alchemy_partitions[] = {
 113         {
 114                 .name = "User FS",
 115                 .size = BOARD_FLASH_SIZE - 0x00400000,
 116                 .offset = 0x0000000
 117         },{
 118                 .name = "YAMON",
 119                 .size = 0x0100000,
 120                 .offset = MTDPART_OFS_APPEND,
 121                 .mask_flags = MTD_WRITEABLE
 122         },{
 123                 .name = "raw kernel",
 124                 .size = (0x300000 - 0x40000), /* last 256KB is yamon env */
 125                 .offset = MTDPART_OFS_APPEND,
 126         }
 127 };
 128
 129 #define NB_OF(x)  (sizeof(x)/sizeof(x[0]))
 130
 131 static struct mtd_info *mymtd;
 132
 133 int __init alchemy_mtd_init(void)
 134 {
 135         struct mtd_partition *parts;
 136         int nb_parts = 0;
 137         unsigned long window_addr;
 138         unsigned long window_size;
 139
 140         /* Default flash buswidth */
 141         alchemy_map.bankwidth = BOARD_FLASH_WIDTH;
 142
 143         window_addr = 0x20000000 - BOARD_FLASH_SIZE;
 144         window_size = BOARD_FLASH_SIZE;
 145 #ifdef CONFIG_MIPS_MIRAGE_WHY
 146         /* Boot ROM flash bank only; no user bank */
 147         window_addr = 0x1C000000;
 148         window_size = 0x04000000;
 149         /* USERFS from 0x1C00 0000 to 0x1FC00000 */
 150         alchemy_partitions[0].size = 0x03C00000;
 151 #endif
 152
 153         /*
 154          * Static partition definition selection
 155          */
 156         parts = alchemy_partitions;
 157         nb_parts = NB_OF(alchemy_partitions);
 158         alchemy_map.size = window_size;
 159
 160         /*
 161          * Now let's probe for the actual flash.  Do it here since
 162          * specific machine settings might have been set above.
 163          */
 164         printk(KERN_NOTICE BOARD_MAP_NAME ": probing %d-bit flash bus\n",
 165                         alchemy_map.bankwidth*8);
 166         alchemy_map.virt = ioremap(window_addr, window_size);
 167         mymtd = do_map_probe("cfi_probe", &alchemy_map);
 168         if (!mymtd) {
 169                 iounmap(alchemy_map.virt);
 170                 return -ENXIO;
 171         }
 172         mymtd->owner = THIS_MODULE;
 173
 174         add_mtd_partitions(mymtd, parts, nb_parts);
 175         return 0;
 176 }
 177
 178 static void __exit alchemy_mtd_cleanup(void)
 179 {
 180         if (mymtd) {
 181                 del_mtd_partitions(mymtd);
 182                 map_destroy(mymtd);
 183                 iounmap(alchemy_map.virt);
 184         }
 185 }
 186
 187 module_init(alchemy_mtd_init);
 188 module_exit(alchemy_mtd_cleanup);
 189
 190 MODULE_AUTHOR("Embedded Alley Solutions, Inc");
 191 MODULE_DESCRIPTION(BOARD_MAP_NAME " MTD driver");
 192 MODULE_LICENSE("GPL");