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flash_setup.c

/*
 *   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/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;
#ifdef CONFIG_MTD_PARTITIONS
static int nr_parts;
static struct mtd_partition *parts;
static const char *part_probe_types[] = {
      "cmdlinepart",
#ifdef CONFIG_MTD_REDBOOT_PARTS
      "RedBoot",
#endif
      NULL
};
#endif

/**
 * Module/ driver initialization.
 *
 * Returns Zero on success
 */
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;

#ifdef CONFIG_MTD_PARTITIONS
                  nr_parts = parse_mtd_partitions(mymtd,
                                          part_probe_types,
                                          &parts, 0);
                  if (nr_parts > 0)
                        add_mtd_partitions(mymtd, parts, nr_parts);
                  else
                        add_mtd_device(mymtd);
#else
                  add_mtd_device(mymtd);
#endif
            } else {
                  pr_err("Failed to register MTD device for flash\n");
            }
      }
      return 0;
}

late_initcall(flash_init);

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