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 const char *part_probe_types[] = {
  21         "cmdlinepart",
  22 #ifdef CONFIG_MTD_REDBOOT_PARTS
  23         "RedBoot",
  24 #endif
  25         NULL
  26 };
  27
  28 /**
  29  * Module/ driver initialization.
  30  *
  31  * Returns Zero on success
  32  */
  33 static int __init flash_init(void)
  34 {
  35         /*
  36          * Read the bootbus region 0 setup to determine the base
  37          * address of the flash.
  38          */
  39         union cvmx_mio_boot_reg_cfgx region_cfg;
  40         region_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(0));
  41         if (region_cfg.s.en) {
  42                 /*
  43                  * The bootloader always takes the flash and sets its
  44                  * address so the entire flash fits below
  45                  * 0x1fc00000. This way the flash aliases to
  46                  * 0x1fc00000 for booting. Software can access the
  47                  * full flash at the true address, while core boot can
  48                  * access 4MB.
  49                  */
  50                 /* Use this name so old part lines work */
  51                 flash_map.name = "phys_mapped_flash";
  52                 flash_map.phys = region_cfg.s.base << 16;
  53                 flash_map.size = 0x1fc00000 - flash_map.phys;
  54                 /* 8-bit bus (0 + 1) or 16-bit bus (1 + 1) */
  55                 flash_map.bankwidth = region_cfg.s.width + 1;
  56                 flash_map.virt = ioremap(flash_map.phys, flash_map.size);
  57                 pr_notice("Bootbus flash: Setting flash for %luMB flash at "
  58                           "0x%08llx\n", flash_map.size >> 20, flash_map.phys);
  59                 simple_map_init(&flash_map);
  60                 mymtd = do_map_probe("cfi_probe", &flash_map);
  61                 if (mymtd) {
  62                         mymtd->owner = THIS_MODULE;
  63                         mtd_device_parse_register(mymtd, part_probe_types,
  64                                                   NULL, NULL, 0);
  65                 } else {
  66                         pr_err("Failed to register MTD device for flash\n");
  67                 }
  68         }
  69         return 0;
  70 }
  71
  72 late_initcall(flash_init);