arch/arm/mach-exynos/mach-exynos5-dt.c

   1 /*
   2  * SAMSUNG EXYNOS5250 Flattened Device Tree enabled machine
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *              http://www.samsung.com
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10 */
  11
  12 #include <linux/of_platform.h>
  13 #include <linux/of_fdt.h>
  14 #include <linux/memblock.h>
  15 #include <linux/io.h>
  16 #include <linux/clocksource.h>
  17
  18 #include <asm/mach/arch.h>
  19 #include <mach/regs-pmu.h>
  20
  21 #include <plat/cpu.h>
  22 #include <plat/mfc.h>
  23
  24 #include "common.h"
  25
  26 static void __init exynos5_dt_map_io(void)
  27 {
  28         exynos_init_io(NULL, 0);
  29 }
  30
  31 static void __init exynos5_dt_machine_init(void)
  32 {
  33         struct device_node *i2c_np;
  34         const char *i2c_compat = "samsung,s3c2440-i2c";
  35         unsigned int tmp;
  36
  37         /*
  38          * Exynos5's legacy i2c controller and new high speed i2c
  39          * controller have muxed interrupt sources. By default the
  40          * interrupts for 4-channel HS-I2C controller are enabled.
  41          * If node for first four channels of legacy i2c controller
  42          * are available then re-configure the interrupts via the
  43          * system register.
  44          */
  45         for_each_compatible_node(i2c_np, NULL, i2c_compat) {
  46                 if (of_device_is_available(i2c_np)) {
  47                         if (of_alias_get_id(i2c_np, "i2c") < 4) {
  48                                 tmp = readl(EXYNOS5_SYS_I2C_CFG);
  49                                 writel(tmp & ~(0x1 << of_alias_get_id(i2c_np, "i2c")),
  50                                                 EXYNOS5_SYS_I2C_CFG);
  51                         }
  52                 }
  53         }
  54
  55         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
  56 }
  57
  58 static char const *exynos5_dt_compat[] __initdata = {
  59         "samsung,exynos5250",
  60         "samsung,exynos5440",
  61         NULL
  62 };
  63
  64 static void __init exynos5_reserve(void)
  65 {
  66 #ifdef CONFIG_S5P_DEV_MFC
  67         struct s5p_mfc_dt_meminfo mfc_mem;
  68
  69         /* Reserve memory for MFC only if it's available */
  70         mfc_mem.compatible = "samsung,mfc-v6";
  71         if (of_scan_flat_dt(s5p_fdt_find_mfc_mem, &mfc_mem))
  72                 s5p_mfc_reserve_mem(mfc_mem.roff, mfc_mem.rsize, mfc_mem.loff,
  73                                 mfc_mem.lsize);
  74 #endif
  75 }
  76
  77 DT_MACHINE_START(EXYNOS5_DT, "SAMSUNG EXYNOS5 (Flattened Device Tree)")
  78         /* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
  79         .init_irq       = exynos5_init_irq,
  80         .smp            = smp_ops(exynos_smp_ops),
  81         .map_io         = exynos5_dt_map_io,
  82         .init_machine   = exynos5_dt_machine_init,
  83         .init_late      = exynos_init_late,
  84         .init_time      = exynos_init_time,
  85         .dt_compat      = exynos5_dt_compat,
  86         .restart        = exynos5_restart,
  87         .reserve        = exynos5_reserve,
  88 MACHINE_END