arch/arm/mach-exynos/exynos.c

   1 /*
   2  * SAMSUNG EXYNOS Flattened Device Tree enabled machine
   3  *
   4  * Copyright (c) 2010-2014 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/init.h>
  13 #include <linux/io.h>
  14 #include <linux/of.h>
  15 #include <linux/of_address.h>
  16 #include <linux/of_fdt.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/irqchip.h>
  19 #include <linux/soc/samsung/exynos-regs-pmu.h>
  20
  21 #include <asm/cacheflush.h>
  22 #include <asm/hardware/cache-l2x0.h>
  23 #include <asm/mach/arch.h>
  24 #include <asm/mach/map.h>
  25
  26 #include <mach/map.h>
  27 #include <plat/cpu.h>
  28
  29 #include "common.h"
  30
  31 static struct map_desc exynos4_iodesc[] __initdata = {
  32         {
  33                 .virtual        = (unsigned long)S5P_VA_COREPERI_BASE,
  34                 .pfn            = __phys_to_pfn(EXYNOS4_PA_COREPERI),
  35                 .length         = SZ_8K,
  36                 .type           = MT_DEVICE,
  37         },
  38 };
  39
  40 static struct platform_device exynos_cpuidle = {
  41         .name              = "exynos_cpuidle",
  42 #ifdef CONFIG_ARM_EXYNOS_CPUIDLE
  43         .dev.platform_data = exynos_enter_aftr,
  44 #endif
  45         .id                = -1,
  46 };
  47
  48 void __iomem *sysram_base_addr;
  49 void __iomem *sysram_ns_base_addr;
  50
  51 void __init exynos_sysram_init(void)
  52 {
  53         struct device_node *node;
  54
  55         for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") {
  56                 if (!of_device_is_available(node))
  57                         continue;
  58                 sysram_base_addr = of_iomap(node, 0);
  59                 break;
  60         }
  61
  62         for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") {
  63                 if (!of_device_is_available(node))
  64                         continue;
  65                 sysram_ns_base_addr = of_iomap(node, 0);
  66                 break;
  67         }
  68 }
  69
  70 static void __init exynos_init_late(void)
  71 {
  72         if (of_machine_is_compatible("samsung,exynos5440"))
  73                 /* to be supported later */
  74                 return;
  75
  76         exynos_pm_init();
  77 }
  78
  79 static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
  80                                         int depth, void *data)
  81 {
  82         struct map_desc iodesc;
  83         const __be32 *reg;
  84         int len;
  85
  86         if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid") &&
  87                 !of_flat_dt_is_compatible(node, "samsung,exynos5440-clock"))
  88                 return 0;
  89
  90         reg = of_get_flat_dt_prop(node, "reg", &len);
  91         if (reg == NULL || len != (sizeof(unsigned long) * 2))
  92                 return 0;
  93
  94         iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0]));
  95         iodesc.length = be32_to_cpu(reg[1]) - 1;
  96         iodesc.virtual = (unsigned long)S5P_VA_CHIPID;
  97         iodesc.type = MT_DEVICE;
  98         iotable_init(&iodesc, 1);
  99         return 1;
 100 }
 101
 102 /*
 103  * exynos_map_io
 104  *
 105  * register the standard cpu IO areas
 106  */
 107 static void __init exynos_map_io(void)
 108 {
 109         if (soc_is_exynos4())
 110                 iotable_init(exynos4_iodesc, ARRAY_SIZE(exynos4_iodesc));
 111 }
 112
 113 static void __init exynos_init_io(void)
 114 {
 115         debug_ll_io_init();
 116
 117         of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
 118
 119         /* detect cpu id and rev. */
 120         s5p_init_cpu(S5P_VA_CHIPID);
 121
 122         exynos_map_io();
 123 }
 124
 125 /*
 126  * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
 127  * and suspend.
 128  *
 129  * This is necessary only on Exynos4 SoCs. When system is running
 130  * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down
 131  * feature could properly detect global idle state when secondary CPU is
 132  * powered down.
 133  *
 134  * However this should not be set when such system is going into suspend.
 135  */
 136 void exynos_set_delayed_reset_assertion(bool enable)
 137 {
 138         if (of_machine_is_compatible("samsung,exynos4")) {
 139                 unsigned int tmp, core_id;
 140
 141                 for (core_id = 0; core_id < num_possible_cpus(); core_id++) {
 142                         tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id));
 143                         if (enable)
 144                                 tmp |= S5P_USE_DELAYED_RESET_ASSERTION;
 145                         else
 146                                 tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION);
 147                         pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id));
 148                 }
 149         }
 150 }
 151
 152 /*
 153  * Apparently, these SoCs are not able to wake-up from suspend using
 154  * the PMU. Too bad. Should they suddenly become capable of such a
 155  * feat, the matches below should be moved to suspend.c.
 156  */
 157 static const struct of_device_id exynos_dt_pmu_match[] = {
 158         { .compatible = "samsung,exynos5260-pmu" },
 159         { .compatible = "samsung,exynos5410-pmu" },
 160         { /*sentinel*/ },
 161 };
 162
 163 static void exynos_map_pmu(void)
 164 {
 165         struct device_node *np;
 166
 167         np = of_find_matching_node(NULL, exynos_dt_pmu_match);
 168         if (np)
 169                 pmu_base_addr = of_iomap(np, 0);
 170 }
 171
 172 static void __init exynos_init_irq(void)
 173 {
 174         irqchip_init();
 175         /*
 176          * Since platsmp.c needs pmu base address by the time
 177          * DT is not unflatten so we can't use DT APIs before
 178          * init_irq
 179          */
 180         exynos_map_pmu();
 181 }
 182
 183 static void __init exynos_dt_machine_init(void)
 184 {
 185         /*
 186          * This is called from smp_prepare_cpus if we've built for SMP, but
 187          * we still need to set it up for PM and firmware ops if not.
 188          */
 189         if (!IS_ENABLED(CONFIG_SMP))
 190                 exynos_sysram_init();
 191
 192 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
 193         if (of_machine_is_compatible("samsung,exynos4210") ||
 194             of_machine_is_compatible("samsung,exynos3250"))
 195                 exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
 196 #endif
 197         if (of_machine_is_compatible("samsung,exynos4210") ||
 198             of_machine_is_compatible("samsung,exynos4212") ||
 199             (of_machine_is_compatible("samsung,exynos4412") &&
 200              of_machine_is_compatible("samsung,trats2")) ||
 201             of_machine_is_compatible("samsung,exynos3250") ||
 202             of_machine_is_compatible("samsung,exynos5250"))
 203                 platform_device_register(&exynos_cpuidle);
 204 }
 205
 206 static char const *const exynos_dt_compat[] __initconst = {
 207         "samsung,exynos3",
 208         "samsung,exynos3250",
 209         "samsung,exynos4",
 210         "samsung,exynos4210",
 211         "samsung,exynos4212",
 212         "samsung,exynos4412",
 213         "samsung,exynos4415",
 214         "samsung,exynos5",
 215         "samsung,exynos5250",
 216         "samsung,exynos5260",
 217         "samsung,exynos5420",
 218         "samsung,exynos5440",
 219         NULL
 220 };
 221
 222 static void __init exynos_dt_fixup(void)
 223 {
 224         /*
 225          * Some versions of uboot pass garbage entries in the memory node,
 226          * use the old CONFIG_ARM_NR_BANKS
 227          */
 228         of_fdt_limit_memory(8);
 229 }
 230
 231 DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)")
 232         /* Maintainer: Thomas Abraham <thomas.abraham@linaro.org> */
 233         /* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
 234         .l2c_aux_val    = 0x3c400001,
 235         .l2c_aux_mask   = 0xc20fffff,
 236         .smp            = smp_ops(exynos_smp_ops),
 237         .map_io         = exynos_init_io,
 238         .init_early     = exynos_firmware_init,
 239         .init_irq       = exynos_init_irq,
 240         .init_machine   = exynos_dt_machine_init,
 241         .init_late      = exynos_init_late,
 242         .dt_compat      = exynos_dt_compat,
 243         .dt_fixup       = exynos_dt_fixup,
 244 MACHINE_END