arch/arm/mach-exynos/exynos.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // SAMSUNG EXYNOS Flattened Device Tree enabled machine
   4 //
   5 // Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
   6 //              http://www.samsung.com
   7
   8 #include <linux/init.h>
   9 #include <linux/io.h>
  10 #include <linux/of.h>
  11 #include <linux/of_address.h>
  12 #include <linux/of_fdt.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/irqchip.h>
  15 #include <linux/soc/samsung/exynos-regs-pmu.h>
  16
  17 #include <asm/cacheflush.h>
  18 #include <asm/hardware/cache-l2x0.h>
  19 #include <asm/mach/arch.h>
  20 #include <asm/mach/map.h>
  21
  22 #include <mach/map.h>
  23 #include <plat/cpu.h>
  24
  25 #include "common.h"
  26
  27 static struct map_desc exynos4_iodesc[] __initdata = {
  28         {
  29                 .virtual        = (unsigned long)S5P_VA_COREPERI_BASE,
  30                 .pfn            = __phys_to_pfn(EXYNOS4_PA_COREPERI),
  31                 .length         = SZ_8K,
  32                 .type           = MT_DEVICE,
  33         },
  34 };
  35
  36 static struct platform_device exynos_cpuidle = {
  37         .name              = "exynos_cpuidle",
  38 #ifdef CONFIG_ARM_EXYNOS_CPUIDLE
  39         .dev.platform_data = exynos_enter_aftr,
  40 #endif
  41         .id                = -1,
  42 };
  43
  44 void __iomem *sysram_base_addr __ro_after_init;
  45 void __iomem *sysram_ns_base_addr __ro_after_init;
  46
  47 void __init exynos_sysram_init(void)
  48 {
  49         struct device_node *node;
  50
  51         for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") {
  52                 if (!of_device_is_available(node))
  53                         continue;
  54                 sysram_base_addr = of_iomap(node, 0);
  55                 break;
  56         }
  57
  58         for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") {
  59                 if (!of_device_is_available(node))
  60                         continue;
  61                 sysram_ns_base_addr = of_iomap(node, 0);
  62                 break;
  63         }
  64 }
  65
  66 static void __init exynos_init_late(void)
  67 {
  68         if (of_machine_is_compatible("samsung,exynos5440"))
  69                 /* to be supported later */
  70                 return;
  71
  72         exynos_pm_init();
  73 }
  74
  75 static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
  76                                         int depth, void *data)
  77 {
  78         struct map_desc iodesc;
  79         const __be32 *reg;
  80         int len;
  81
  82         if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid") &&
  83                 !of_flat_dt_is_compatible(node, "samsung,exynos5440-clock"))
  84                 return 0;
  85
  86         reg = of_get_flat_dt_prop(node, "reg", &len);
  87         if (reg == NULL || len != (sizeof(unsigned long) * 2))
  88                 return 0;
  89
  90         iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0]));
  91         iodesc.length = be32_to_cpu(reg[1]) - 1;
  92         iodesc.virtual = (unsigned long)S5P_VA_CHIPID;
  93         iodesc.type = MT_DEVICE;
  94         iotable_init(&iodesc, 1);
  95         return 1;
  96 }
  97
  98 /*
  99  * exynos_map_io
 100  *
 101  * register the standard cpu IO areas
 102  */
 103 static void __init exynos_map_io(void)
 104 {
 105         if (soc_is_exynos4())
 106                 iotable_init(exynos4_iodesc, ARRAY_SIZE(exynos4_iodesc));
 107 }
 108
 109 static void __init exynos_init_io(void)
 110 {
 111         debug_ll_io_init();
 112
 113         of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
 114
 115         /* detect cpu id and rev. */
 116         s5p_init_cpu(S5P_VA_CHIPID);
 117
 118         exynos_map_io();
 119 }
 120
 121 /*
 122  * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
 123  * and suspend.
 124  *
 125  * This is necessary only on Exynos4 SoCs. When system is running
 126  * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down
 127  * feature could properly detect global idle state when secondary CPU is
 128  * powered down.
 129  *
 130  * However this should not be set when such system is going into suspend.
 131  */
 132 void exynos_set_delayed_reset_assertion(bool enable)
 133 {
 134         if (of_machine_is_compatible("samsung,exynos4")) {
 135                 unsigned int tmp, core_id;
 136
 137                 for (core_id = 0; core_id < num_possible_cpus(); core_id++) {
 138                         tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id));
 139                         if (enable)
 140                                 tmp |= S5P_USE_DELAYED_RESET_ASSERTION;
 141                         else
 142                                 tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION);
 143                         pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id));
 144                 }
 145         }
 146 }
 147
 148 /*
 149  * Apparently, these SoCs are not able to wake-up from suspend using
 150  * the PMU. Too bad. Should they suddenly become capable of such a
 151  * feat, the matches below should be moved to suspend.c.
 152  */
 153 static const struct of_device_id exynos_dt_pmu_match[] = {
 154         { .compatible = "samsung,exynos5260-pmu" },
 155         { .compatible = "samsung,exynos5410-pmu" },
 156         { /*sentinel*/ },
 157 };
 158
 159 static void exynos_map_pmu(void)
 160 {
 161         struct device_node *np;
 162
 163         np = of_find_matching_node(NULL, exynos_dt_pmu_match);
 164         if (np)
 165                 pmu_base_addr = of_iomap(np, 0);
 166 }
 167
 168 static void __init exynos_init_irq(void)
 169 {
 170         irqchip_init();
 171         /*
 172          * Since platsmp.c needs pmu base address by the time
 173          * DT is not unflatten so we can't use DT APIs before
 174          * init_irq
 175          */
 176         exynos_map_pmu();
 177 }
 178
 179 static void __init exynos_dt_machine_init(void)
 180 {
 181         /*
 182          * This is called from smp_prepare_cpus if we've built for SMP, but
 183          * we still need to set it up for PM and firmware ops if not.
 184          */
 185         if (!IS_ENABLED(CONFIG_SMP))
 186                 exynos_sysram_init();
 187
 188 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
 189         if (of_machine_is_compatible("samsung,exynos4210") ||
 190             of_machine_is_compatible("samsung,exynos3250"))
 191                 exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
 192 #endif
 193         if (of_machine_is_compatible("samsung,exynos4210") ||
 194             (of_machine_is_compatible("samsung,exynos4412") &&
 195              of_machine_is_compatible("samsung,trats2")) ||
 196             of_machine_is_compatible("samsung,exynos3250") ||
 197             of_machine_is_compatible("samsung,exynos5250"))
 198                 platform_device_register(&exynos_cpuidle);
 199 }
 200
 201 static char const *const exynos_dt_compat[] __initconst = {
 202         "samsung,exynos3",
 203         "samsung,exynos3250",
 204         "samsung,exynos4",
 205         "samsung,exynos4210",
 206         "samsung,exynos4412",
 207         "samsung,exynos5",
 208         "samsung,exynos5250",
 209         "samsung,exynos5260",
 210         "samsung,exynos5420",
 211         "samsung,exynos5440",
 212         NULL
 213 };
 214
 215 static void __init exynos_dt_fixup(void)
 216 {
 217         /*
 218          * Some versions of uboot pass garbage entries in the memory node,
 219          * use the old CONFIG_ARM_NR_BANKS
 220          */
 221         of_fdt_limit_memory(8);
 222 }
 223
 224 DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)")
 225         /* Maintainer: Thomas Abraham <thomas.abraham@linaro.org> */
 226         /* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
 227         .l2c_aux_val    = 0x3c400001,
 228         .l2c_aux_mask   = 0xc20fffff,
 229         .smp            = smp_ops(exynos_smp_ops),
 230         .map_io         = exynos_init_io,
 231         .init_early     = exynos_firmware_init,
 232         .init_irq       = exynos_init_irq,
 233         .init_machine   = exynos_dt_machine_init,
 234         .init_late      = exynos_init_late,
 235         .dt_compat      = exynos_dt_compat,
 236         .dt_fixup       = exynos_dt_fixup,
 237 MACHINE_END