arch/arm/mach-s3c64xx/mach-s3c64xx-dt.c

   1 /*
   2  * Samsung's S3C64XX flattened device tree enabled machine
   3  *
   4  * Copyright (c) 2013 Tomasz Figa <tomasz.figa@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9 */
  10
  11 #include <linux/of_platform.h>
  12
  13 #include <asm/mach/arch.h>
  14 #include <asm/mach/map.h>
  15 #include <asm/system_misc.h>
  16
  17 #include <plat/cpu.h>
  18 #include <plat/watchdog-reset.h>
  19
  20 #include <mach/map.h>
  21
  22 #include "common.h"
  23
  24 /*
  25  * IO mapping for shared system controller IP.
  26  *
  27  * FIXME: Make remaining drivers use dynamic mapping.
  28  */
  29 static struct map_desc s3c64xx_dt_iodesc[] __initdata = {
  30         {
  31                 .virtual        = (unsigned long)S3C_VA_SYS,
  32                 .pfn            = __phys_to_pfn(S3C64XX_PA_SYSCON),
  33                 .length         = SZ_4K,
  34                 .type           = MT_DEVICE,
  35         },
  36 };
  37
  38 static void __init s3c64xx_dt_map_io(void)
  39 {
  40         debug_ll_io_init();
  41         iotable_init(s3c64xx_dt_iodesc, ARRAY_SIZE(s3c64xx_dt_iodesc));
  42
  43         s3c64xx_init_cpu();
  44
  45         if (!soc_is_s3c64xx())
  46                 panic("SoC is not S3C64xx!");
  47 }
  48
  49 static void __init s3c64xx_dt_init_machine(void)
  50 {
  51         samsung_wdt_reset_of_init();
  52         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
  53 }
  54
  55 static void s3c64xx_dt_restart(enum reboot_mode mode, const char *cmd)
  56 {
  57         if (mode != REBOOT_SOFT)
  58                 samsung_wdt_reset();
  59
  60         /* if all else fails, or mode was for soft, jump to 0 */
  61         soft_restart(0);
  62 }
  63
  64 static char const *s3c64xx_dt_compat[] __initdata = {
  65         "samsung,s3c6400",
  66         "samsung,s3c6410",
  67         NULL
  68 };
  69
  70 DT_MACHINE_START(S3C6400_DT, "Samsung S3C64xx (Flattened Device Tree)")
  71         /* Maintainer: Tomasz Figa <tomasz.figa@gmail.com> */
  72         .dt_compat      = s3c64xx_dt_compat,
  73         .map_io         = s3c64xx_dt_map_io,
  74         .init_machine   = s3c64xx_dt_init_machine,
  75         .restart        = s3c64xx_dt_restart,
  76 MACHINE_END