LXR linux/drivers/mtd/maps/impa7.c

   1/*
   2 * Handle mapping of the NOR flash on implementa A7 boards
   3 *
   4 * Copyright 2002 SYSGO Real-Time Solutions GmbH
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10
  11#include <linux/module.h>
  12#include <linux/types.h>
  13#include <linux/kernel.h>
  14#include <linux/init.h>
  15#include <asm/io.h>
  16#include <linux/mtd/mtd.h>
  17#include <linux/mtd/map.h>
  18
  19#ifdef CONFIG_MTD_PARTITIONS
  20#include <linux/mtd/partitions.h>
  21#endif
  22
  23#define WINDOW_ADDR0 0x00000000      /* physical properties of flash */
  24#define WINDOW_SIZE0 0x00800000
  25#define WINDOW_ADDR1 0x10000000      /* physical properties of flash */
  26#define WINDOW_SIZE1 0x00800000
  27#define NUM_FLASHBANKS 2
  28#define BUSWIDTH     4
  29
  30/* can be { "cfi_probe", "jedec_probe", "map_rom", NULL } */
  31#define PROBETYPES { "jedec_probe", NULL }
  32
  33#define MSG_PREFIX "impA7:"   /* prefix for our printk()'s */
  34#define MTDID      "impa7-%d"  /* for mtdparts= partitioning */
  35
  36static struct mtd_info *impa7_mtd[NUM_FLASHBANKS];
  37
  38
  39static struct map_info impa7_map[NUM_FLASHBANKS] = {
  40        {
  41                .name = "impA7 NOR Flash Bank #0",
  42                .size = WINDOW_SIZE0,
  43                .bankwidth = BUSWIDTH,
  44        },
  45        {
  46                .name = "impA7 NOR Flash Bank #1",
  47                .size = WINDOW_SIZE1,
  48                .bankwidth = BUSWIDTH,
  49        },
  50};
  51
  52#ifdef CONFIG_MTD_PARTITIONS
  53
  54/*
  55 * MTD partitioning stuff
  56 */
  57static struct mtd_partition static_partitions[] =
  58{
  59        {
  60                .name = "FileSystem",
  61                .size = 0x800000,
  62                .offset = 0x00000000
  63        },
  64};
  65
  66static int mtd_parts_nb[NUM_FLASHBANKS];
  67static struct mtd_partition *mtd_parts[NUM_FLASHBANKS];
  68
  69#endif
  70
  71static const char *probes[] = { "cmdlinepart", NULL };
  72
  73static int __init init_impa7(void)
  74{
  75        static const char *rom_probe_types[] = PROBETYPES;
  76        const char **type;
  77        const char *part_type = 0;
  78        int i;
  79        static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
  80          { WINDOW_ADDR0, WINDOW_SIZE0 },
  81          { WINDOW_ADDR1, WINDOW_SIZE1 },
  82        };
  83        int devicesfound = 0;
  84
  85        for(i=0; i<NUM_FLASHBANKS; i++)
  86        {
  87                printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
  88                       pt[i].size, pt[i].addr);
  89
  90                impa7_map[i].phys = pt[i].addr;
  91                impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size);
  92                if (!impa7_map[i].virt) {
  93                        printk(MSG_PREFIX "failed to ioremap\n");
  94                        return -EIO;
  95                }
  96                simple_map_init(&impa7_map[i]);
  97
  98                impa7_mtd[i] = 0;
  99                type = rom_probe_types;
 100                for(; !impa7_mtd[i] && *type; type++) {
 101                        impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
 102                }
 103
 104                if (impa7_mtd[i]) {
 105                        impa7_mtd[i]->owner = THIS_MODULE;
 106                        devicesfound++;
 107#ifdef CONFIG_MTD_PARTITIONS
 108                        mtd_parts_nb[i] = parse_mtd_partitions(impa7_mtd[i],
 109                                                               probes,
 110                                                               &mtd_parts[i],
 111                                                               0);
 112                        if (mtd_parts_nb[i] > 0) {
 113                                part_type = "command line";
 114                        } else {
 115                                mtd_parts[i] = static_partitions;
 116                                mtd_parts_nb[i] = ARRAY_SIZE(static_partitions);
 117                                part_type = "static";
 118                        }
 119
 120                        printk(KERN_NOTICE MSG_PREFIX
 121                               "using %s partition definition\n",
 122                               part_type);
 123                        add_mtd_partitions(impa7_mtd[i],
 124                                           mtd_parts[i], mtd_parts_nb[i]);
 125#else
 126                        add_mtd_device(impa7_mtd[i]);
 127
 128#endif
 129                }
 130                else
 131                        iounmap((void *)impa7_map[i].virt);
 132        }
 133        return devicesfound == 0 ? -ENXIO : 0;
 134}
 135
 136static void __exit cleanup_impa7(void)
 137{
 138        int i;
 139        for (i=0; i<NUM_FLASHBANKS; i++) {
 140                if (impa7_mtd[i]) {
 141#ifdef CONFIG_MTD_PARTITIONS
 142                        del_mtd_partitions(impa7_mtd[i]);
 143#else
 144                        del_mtd_device(impa7_mtd[i]);
 145#endif
 146                        map_destroy(impa7_mtd[i]);
 147                        iounmap((void *)impa7_map[i].virt);
 148                        impa7_map[i].virt = 0;
 149                }
 150        }
 151}
 152
 153module_init(init_impa7);
 154module_exit(cleanup_impa7);
 155
 156MODULE_LICENSE("GPL");
 157MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
 158MODULE_DESCRIPTION("MTD map driver for implementa impA7");
 159