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/clk-provider.h>
  12 #include <linux/irqchip.h>
  13 #include <linux/of_platform.h>
  14
  15 #include <asm/mach/arch.h>
  16 #include <asm/mach/map.h>
  17 #include <asm/system_misc.h>
  18
  19 #include <plat/cpu.h>
  20 #include <plat/watchdog-reset.h>
  21
  22 #include <mach/map.h>
  23
  24 #include "common.h"
  25
  26 /*
  27  * IO mapping for shared system controller IP.
  28  *
  29  * FIXME: Make remaining drivers use dynamic mapping.
  30  */
  31 static struct map_desc s3c64xx_dt_iodesc[] __initdata = {
  32         {
  33                 .virtual        = (unsigned long)S3C_VA_SYS,
  34                 .pfn            = __phys_to_pfn(S3C64XX_PA_SYSCON),
  35                 .length         = SZ_4K,
  36                 .type           = MT_DEVICE,
  37         },
  38 };
  39
  40 static void __init s3c64xx_dt_map_io(void)
  41 {
  42         debug_ll_io_init();
  43         iotable_init(s3c64xx_dt_iodesc, ARRAY_SIZE(s3c64xx_dt_iodesc));
  44
  45         s3c64xx_init_cpu();
  46
  47         if (!soc_is_s3c64xx())
  48                 panic("SoC is not S3C64xx!");
  49 }
  50
  51 static void __init s3c64xx_dt_init_irq(void)
  52 {
  53         of_clk_init(NULL);
  54         samsung_wdt_reset_of_init();
  55         irqchip_init();
  56 };
  57
  58 static void __init s3c64xx_dt_init_machine(void)
  59 {
  60         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
  61 }
  62
  63 static void s3c64xx_dt_restart(enum reboot_mode mode, const char *cmd)
  64 {
  65         if (mode != REBOOT_SOFT)
  66                 samsung_wdt_reset();
  67
  68         /* if all else fails, or mode was for soft, jump to 0 */
  69         soft_restart(0);
  70 }
  71
  72 static char const *s3c64xx_dt_compat[] __initdata = {
  73         "samsung,s3c6400",
  74         "samsung,s3c6410",
  75         NULL
  76 };
  77
  78 DT_MACHINE_START(S3C6400_DT, "Samsung S3C64xx (Flattened Device Tree)")
  79         /* Maintainer: Tomasz Figa <tomasz.figa@gmail.com> */
  80         .dt_compat      = s3c64xx_dt_compat,
  81         .map_io         = s3c64xx_dt_map_io,
  82         .init_irq       = s3c64xx_dt_init_irq,
  83         .init_machine   = s3c64xx_dt_init_machine,
  84         .restart        = s3c64xx_dt_restart,
  85 MACHINE_END