drivers/mtd/maps/alchemy-flash.c

   1 /*
   2  * Flash memory access on AMD Alchemy evaluation boards
   3  *
   4  * (C) 2003, 2004 Pete Popov <ppopov@embeddedalley.com>
   5  */
   6
   7 #include <linux/init.h>
   8 #include <linux/module.h>
   9 #include <linux/types.h>
  10 #include <linux/kernel.h>
  11
  12 #include <linux/mtd/mtd.h>
  13 #include <linux/mtd/map.h>
  14 #include <linux/mtd/partitions.h>
  15
  16 #include <asm/io.h>
  17
  18 #ifdef CONFIG_MIPS_PB1000
  19 #define BOARD_MAP_NAME "Pb1000 Flash"
  20 #define BOARD_FLASH_SIZE 0x00800000 /* 8MB */
  21 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  22 #endif
  23
  24 #ifdef CONFIG_MIPS_PB1500
  25 #define BOARD_MAP_NAME "Pb1500 Flash"
  26 #define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
  27 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  28 #endif
  29
  30 #ifdef CONFIG_MIPS_PB1100
  31 #define BOARD_MAP_NAME "Pb1100 Flash"
  32 #define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
  33 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  34 #endif
  35
  36 #ifdef CONFIG_MIPS_PB1550
  37 #define BOARD_MAP_NAME "Pb1550 Flash"
  38 #define BOARD_FLASH_SIZE 0x08000000 /* 128MB */
  39 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  40 #endif
  41
  42 #ifdef CONFIG_MIPS_PB1200
  43 #define BOARD_MAP_NAME "Pb1200 Flash"
  44 #define BOARD_FLASH_SIZE 0x08000000 /* 128MB */
  45 #define BOARD_FLASH_WIDTH 2 /* 16-bits */
  46 #endif
  47
  48 #ifdef CONFIG_MIPS_DB1000
  49 #define BOARD_MAP_NAME "Db1000 Flash"
  50 #define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
  51 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  52 #endif
  53
  54 #ifdef CONFIG_MIPS_DB1500
  55 #define BOARD_MAP_NAME "Db1500 Flash"
  56 #define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
  57 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  58 #endif
  59
  60 #ifdef CONFIG_MIPS_DB1100
  61 #define BOARD_MAP_NAME "Db1100 Flash"
  62 #define BOARD_FLASH_SIZE 0x02000000 /* 32MB */
  63 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  64 #endif
  65
  66 #ifdef CONFIG_MIPS_DB1550
  67 #define BOARD_MAP_NAME "Db1550 Flash"
  68 #define BOARD_FLASH_SIZE 0x08000000 /* 128MB */
  69 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  70 #endif
  71
  72 #ifdef CONFIG_MIPS_DB1200
  73 #define BOARD_MAP_NAME "Db1200 Flash"
  74 #define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
  75 #define BOARD_FLASH_WIDTH 2 /* 16-bits */
  76 #endif
  77
  78 #ifdef CONFIG_MIPS_BOSPORUS
  79 #define BOARD_MAP_NAME "Bosporus Flash"
  80 #define BOARD_FLASH_SIZE 0x01000000 /* 16MB */
  81 #define BOARD_FLASH_WIDTH 2 /* 16-bits */
  82 #endif
  83
  84 #ifdef CONFIG_MIPS_MIRAGE
  85 #define BOARD_MAP_NAME "Mirage Flash"
  86 #define BOARD_FLASH_SIZE 0x04000000 /* 64MB */
  87 #define BOARD_FLASH_WIDTH 4 /* 32-bits */
  88 #define USE_LOCAL_ACCESSORS /* why? */
  89 #endif
  90
  91 static struct map_info alchemy_map = {
  92         .name = BOARD_MAP_NAME,
  93 };
  94
  95 static struct mtd_partition alchemy_partitions[] = {
  96         {
  97                 .name = "User FS",
  98                 .size = BOARD_FLASH_SIZE - 0x00400000,
  99                 .offset = 0x0000000
 100         },{
 101                 .name = "YAMON",
 102                 .size = 0x0100000,
 103                 .offset = MTDPART_OFS_APPEND,
 104                 .mask_flags = MTD_WRITEABLE
 105         },{
 106                 .name = "raw kernel",
 107                 .size = (0x300000 - 0x40000), /* last 256KB is yamon env */
 108                 .offset = MTDPART_OFS_APPEND,
 109         }
 110 };
 111
 112 static struct mtd_info *mymtd;
 113
 114 int __init alchemy_mtd_init(void)
 115 {
 116         struct mtd_partition *parts;
 117         int nb_parts = 0;
 118         unsigned long window_addr;
 119         unsigned long window_size;
 120
 121         /* Default flash buswidth */
 122         alchemy_map.bankwidth = BOARD_FLASH_WIDTH;
 123
 124         window_addr = 0x20000000 - BOARD_FLASH_SIZE;
 125         window_size = BOARD_FLASH_SIZE;
 126
 127         /*
 128          * Static partition definition selection
 129          */
 130         parts = alchemy_partitions;
 131         nb_parts = ARRAY_SIZE(alchemy_partitions);
 132         alchemy_map.size = window_size;
 133
 134         /*
 135          * Now let's probe for the actual flash.  Do it here since
 136          * specific machine settings might have been set above.
 137          */
 138         printk(KERN_NOTICE BOARD_MAP_NAME ": probing %d-bit flash bus\n",
 139                         alchemy_map.bankwidth*8);
 140         alchemy_map.virt = ioremap(window_addr, window_size);
 141         mymtd = do_map_probe("cfi_probe", &alchemy_map);
 142         if (!mymtd) {
 143                 iounmap(alchemy_map.virt);
 144                 return -ENXIO;
 145         }
 146         mymtd->owner = THIS_MODULE;
 147
 148         add_mtd_partitions(mymtd, parts, nb_parts);
 149         return 0;
 150 }
 151
 152 static void __exit alchemy_mtd_cleanup(void)
 153 {
 154         if (mymtd) {
 155                 del_mtd_partitions(mymtd);
 156                 map_destroy(mymtd);
 157                 iounmap(alchemy_map.virt);
 158         }
 159 }
 160
 161 module_init(alchemy_mtd_init);
 162 module_exit(alchemy_mtd_cleanup);
 163
 164 MODULE_AUTHOR("Embedded Alley Solutions, Inc");
 165 MODULE_DESCRIPTION(BOARD_MAP_NAME " MTD driver");
 166 MODULE_LICENSE("GPL");