flash_setup.c

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/*
 *   Octeon Bootbus flash setup
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2007, 2008 Cavium Networks
 */
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>

#include <asm/octeon/octeon.h>

static struct map_info flash_map;
static struct mtd_info *mymtd;
static const char *part_probe_types[] = {
    "cmdlinepart",
#ifdef CONFIG_MTD_REDBOOT_PARTS
    "RedBoot",
#endif
    NULL
};

static int __init flash_init(void)
{
    /*
     * Read the bootbus region 0 setup to determine the base
     * address of the flash.
     */
    union cvmx_mio_boot_reg_cfgx region_cfg;
    region_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(0));
    if (region_cfg.s.en) {
        /*
         * The bootloader always takes the flash and sets its
         * address so the entire flash fits below
         * 0x1fc00000. This way the flash aliases to
         * 0x1fc00000 for booting. Software can access the
         * full flash at the true address, while core boot can
         * access 4MB.
         */
        /* Use this name so old part lines work */
        flash_map.name = "phys_mapped_flash";
        flash_map.phys = region_cfg.s.base << 16;
        flash_map.size = 0x1fc00000 - flash_map.phys;
        flash_map.bankwidth = 1;
        flash_map.virt = ioremap(flash_map.phys, flash_map.size);
        pr_notice("Bootbus flash: Setting flash for %luMB flash at "
              "0x%08llx\n", flash_map.size >> 20, flash_map.phys);
        simple_map_init(&flash_map);
        mymtd = do_map_probe("cfi_probe", &flash_map);
        if (mymtd) {
            mymtd->owner = THIS_MODULE;
            mtd_device_parse_register(mymtd, part_probe_types,
                          NULL, NULL, 0);
        } else {
            pr_err("Failed to register MTD device for flash\n");
        }
    }
    return 0;
}

late_initcall(flash_init);