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 <mach/map.h>
  19
  20 #include "common.h"
  21 #include "watchdog-reset.h"
  22
  23 /*
  24  * IO mapping for shared system controller IP.
  25  *
  26  * FIXME: Make remaining drivers use dynamic mapping.
  27  */
  28 static struct map_desc s3c64xx_dt_iodesc[] __initdata = {
  29         {
  30                 .virtual        = (unsigned long)S3C_VA_SYS,
  31                 .pfn            = __phys_to_pfn(S3C64XX_PA_SYSCON),
  32                 .length         = SZ_4K,
  33                 .type           = MT_DEVICE,
  34         },
  35 };
  36
  37 static void __init s3c64xx_dt_map_io(void)
  38 {
  39         debug_ll_io_init();
  40         iotable_init(s3c64xx_dt_iodesc, ARRAY_SIZE(s3c64xx_dt_iodesc));
  41
  42         s3c64xx_init_cpu();
  43
  44         if (!soc_is_s3c64xx())
  45                 panic("SoC is not S3C64xx!");
  46 }
  47
  48 static void __init s3c64xx_dt_init_machine(void)
  49 {
  50         samsung_wdt_reset_of_init();
  51         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
  52 }
  53
  54 static void s3c64xx_dt_restart(enum reboot_mode mode, const char *cmd)
  55 {
  56         if (mode != REBOOT_SOFT)
  57                 samsung_wdt_reset();
  58
  59         /* if all else fails, or mode was for soft, jump to 0 */
  60         soft_restart(0);
  61 }
  62
  63 static const char *const s3c64xx_dt_compat[] __initconst = {
  64         "samsung,s3c6400",
  65         "samsung,s3c6410",
  66         NULL
  67 };
  68
  69 DT_MACHINE_START(S3C6400_DT, "Samsung S3C64xx (Flattened Device Tree)")
  70         /* Maintainer: Tomasz Figa <tomasz.figa@gmail.com> */
  71         .dt_compat      = s3c64xx_dt_compat,
  72         .map_io         = s3c64xx_dt_map_io,
  73         .init_machine   = s3c64xx_dt_init_machine,
  74         .restart        = s3c64xx_dt_restart,
  75 MACHINE_END