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