LXR linux/arch/mips/cavium-octeon/flash

   1/*
   2 *   Octeon Bootbus flash setup
   3 *
   4 * This file is subject to the terms and conditions of the GNU General Public
   5 * License.  See the file "COPYING" in the main directory of this archive
   6 * for more details.
   7 *
   8 * Copyright (C) 2007, 2008 Cavium Networks
   9 */
  10#include <linux/kernel.h>
  11#include <linux/mtd/mtd.h>
  12#include <linux/mtd/map.h>
  13#include <linux/mtd/partitions.h>
  14
  15#include <asm/octeon/octeon.h>
  16
  17static struct map_info flash_map;
  18static struct mtd_info *mymtd;
  19#ifdef CONFIG_MTD_PARTITIONS
  20static int nr_parts;
  21static struct mtd_partition *parts;
  22static const char *part_probe_types[] = {
  23        "cmdlinepart",
  24#ifdef CONFIG_MTD_REDBOOT_PARTS
  25        "RedBoot",
  26#endif
  27        NULL
  28};
  29#endif
  30
  31/**
  32 * Module/ driver initialization.
  33 *
  34 * Returns Zero on success
  35 */
  36static int __init flash_init(void)
  37{
  38        /*
  39         * Read the bootbus region 0 setup to determine the base
  40         * address of the flash.
  41         */
  42        union cvmx_mio_boot_reg_cfgx region_cfg;
  43        region_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(0));
  44        if (region_cfg.s.en) {
  45                /*
  46                 * The bootloader always takes the flash and sets its
  47                 * address so the entire flash fits below
  48                 * 0x1fc00000. This way the flash aliases to
  49                 * 0x1fc00000 for booting. Software can access the
  50                 * full flash at the true address, while core boot can
  51                 * access 4MB.
  52                 */
  53                /* Use this name so old part lines work */
  54                flash_map.name = "phys_mapped_flash";
  55                flash_map.phys = region_cfg.s.base << 16;
  56                flash_map.size = 0x1fc00000 - flash_map.phys;
  57                flash_map.bankwidth = 1;
  58                flash_map.virt = ioremap(flash_map.phys, flash_map.size);
  59                pr_notice("Bootbus flash: Setting flash for %luMB flash at "
  60                          "0x%08llx\n", flash_map.size >> 20, flash_map.phys);
  61                simple_map_init(&flash_map);
  62                mymtd = do_map_probe("cfi_probe", &flash_map);
  63                if (mymtd) {
  64                        mymtd->owner = THIS_MODULE;
  65
  66#ifdef CONFIG_MTD_PARTITIONS
  67                        nr_parts = parse_mtd_partitions(mymtd,
  68                                                        part_probe_types,
  69                                                        &parts, 0);
  70                        if (nr_parts > 0)
  71                                add_mtd_partitions(mymtd, parts, nr_parts);
  72                        else
  73                                add_mtd_device(mymtd);
  74#else
  75                        add_mtd_device(mymtd);
  76#endif
  77                } else {
  78                        pr_err("Failed to register MTD device for flash\n");
  79                }
  80        }
  81        return 0;
  82}
  83
  84late_initcall(flash_init);
  85