impa7.c

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/*
 * Handle mapping of the NOR flash on implementa A7 boards
 *
 * Copyright 2002 SYSGO Real-Time Solutions GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>

#define WINDOW_ADDR0 0x00000000      /* physical properties of flash */
#define WINDOW_SIZE0 0x00800000
#define WINDOW_ADDR1 0x10000000      /* physical properties of flash */
#define WINDOW_SIZE1 0x00800000
#define NUM_FLASHBANKS 2
#define BUSWIDTH     4

/* can be { "cfi_probe", "jedec_probe", "map_rom", NULL } */
#define PROBETYPES { "jedec_probe", NULL }

#define MSG_PREFIX "impA7:"   /* prefix for our printk()'s */
#define MTDID      "impa7-%d"  /* for mtdparts= partitioning */

static struct mtd_info *impa7_mtd[NUM_FLASHBANKS];


static struct map_info impa7_map[NUM_FLASHBANKS] = {
    {
        .name = "impA7 NOR Flash Bank #0",
        .size = WINDOW_SIZE0,
        .bankwidth = BUSWIDTH,
    },
    {
        .name = "impA7 NOR Flash Bank #1",
        .size = WINDOW_SIZE1,
        .bankwidth = BUSWIDTH,
    },
};

/*
 * MTD partitioning stuff
 */
static struct mtd_partition partitions[] =
{
    {
        .name = "FileSystem",
        .size = 0x800000,
        .offset = 0x00000000
    },
};

static int __init init_impa7(void)
{
    static const char *rom_probe_types[] = PROBETYPES;
    const char **type;
    int i;
    static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
      { WINDOW_ADDR0, WINDOW_SIZE0 },
      { WINDOW_ADDR1, WINDOW_SIZE1 },
        };
    int devicesfound = 0;

    for(i=0; i<NUM_FLASHBANKS; i++)
    {
        printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
               pt[i].size, pt[i].addr);

        impa7_map[i].phys = pt[i].addr;
        impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size);
        if (!impa7_map[i].virt) {
            printk(MSG_PREFIX "failed to ioremap\n");
            return -EIO;
        }
        simple_map_init(&impa7_map[i]);

        impa7_mtd[i] = 0;
        type = rom_probe_types;
        for(; !impa7_mtd[i] && *type; type++) {
            impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
        }

        if (impa7_mtd[i]) {
            impa7_mtd[i]->owner = THIS_MODULE;
            devicesfound++;
            mtd_device_parse_register(impa7_mtd[i], NULL, NULL,
                          partitions,
                          ARRAY_SIZE(partitions));
        }
        else
            iounmap((void *)impa7_map[i].virt);
    }
    return devicesfound == 0 ? -ENXIO : 0;
}

static void __exit cleanup_impa7(void)
{
    int i;
    for (i=0; i<NUM_FLASHBANKS; i++) {
        if (impa7_mtd[i]) {
            mtd_device_unregister(impa7_mtd[i]);
            map_destroy(impa7_mtd[i]);
            iounmap((void *)impa7_map[i].virt);
            impa7_map[i].virt = 0;
        }
    }
}

module_init(init_impa7);
module_exit(cleanup_impa7);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pavel Bartusek <[email protected]>");
MODULE_DESCRIPTION("MTD map driver for implementa impA7");