arch/mips/cavium-octeon/flash_setup.c

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