LXR linux/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
  91static struct map_info alchemy_map = {
  92        .name = BOARD_MAP_NAME,
  93};
  94
  95static 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
 112static struct mtd_info *mymtd;
 113
 114int __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
 152static 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
 161module_init(alchemy_mtd_init);
 162module_exit(alchemy_mtd_cleanup);
 163
 164MODULE_AUTHOR("Embedded Alley Solutions, Inc");
 165MODULE_DESCRIPTION(BOARD_MAP_NAME " MTD driver");
 166MODULE_LICENSE("GPL");
 167