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 platform_device exynos_cpuidle = {
  28         .name              = "exynos_cpuidle",
  29 #ifdef CONFIG_ARM_EXYNOS_CPUIDLE
  30         .dev.platform_data = exynos_enter_aftr,
  31 #endif
  32         .id                = -1,
  33 };
  34
  35 void __iomem *sysram_base_addr __ro_after_init;
  36 phys_addr_t sysram_base_phys __ro_after_init;
  37 void __iomem *sysram_ns_base_addr __ro_after_init;
  38
  39 void __init exynos_sysram_init(void)
  40 {
  41         struct device_node *node;
  42
  43         for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") {
  44                 if (!of_device_is_available(node))
  45                         continue;
  46                 sysram_base_addr = of_iomap(node, 0);
  47                 sysram_base_phys = of_translate_address(node,
  48                                            of_get_address(node, 0, NULL, NULL));
  49                 break;
  50         }
  51
  52         for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") {
  53                 if (!of_device_is_available(node))
  54                         continue;
  55                 sysram_ns_base_addr = of_iomap(node, 0);
  56                 break;
  57         }
  58 }
  59
  60 static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
  61                                         int depth, void *data)
  62 {
  63         struct map_desc iodesc;
  64         const __be32 *reg;
  65         int len;
  66
  67         if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid"))
  68                 return 0;
  69
  70         reg = of_get_flat_dt_prop(node, "reg", &len);
  71         if (reg == NULL || len != (sizeof(unsigned long) * 2))
  72                 return 0;
  73
  74         iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0]));
  75         iodesc.length = be32_to_cpu(reg[1]) - 1;
  76         iodesc.virtual = (unsigned long)S5P_VA_CHIPID;
  77         iodesc.type = MT_DEVICE;
  78         iotable_init(&iodesc, 1);
  79         return 1;
  80 }
  81
  82 static void __init exynos_init_io(void)
  83 {
  84         debug_ll_io_init();
  85
  86         of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
  87
  88         /* detect cpu id and rev. */
  89         s5p_init_cpu(S5P_VA_CHIPID);
  90 }
  91
  92 /*
  93  * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
  94  * and suspend.
  95  *
  96  * This is necessary only on Exynos4 SoCs. When system is running
  97  * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down
  98  * feature could properly detect global idle state when secondary CPU is
  99  * powered down.
 100  *
 101  * However this should not be set when such system is going into suspend.
 102  */
 103 void exynos_set_delayed_reset_assertion(bool enable)
 104 {
 105         if (of_machine_is_compatible("samsung,exynos4")) {
 106                 unsigned int tmp, core_id;
 107
 108                 for (core_id = 0; core_id < num_possible_cpus(); core_id++) {
 109                         tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id));
 110                         if (enable)
 111                                 tmp |= S5P_USE_DELAYED_RESET_ASSERTION;
 112                         else
 113                                 tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION);
 114                         pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id));
 115                 }
 116         }
 117 }
 118
 119 /*
 120  * Apparently, these SoCs are not able to wake-up from suspend using
 121  * the PMU. Too bad. Should they suddenly become capable of such a
 122  * feat, the matches below should be moved to suspend.c.
 123  */
 124 static const struct of_device_id exynos_dt_pmu_match[] = {
 125         { .compatible = "samsung,exynos5260-pmu" },
 126         { .compatible = "samsung,exynos5410-pmu" },
 127         { /*sentinel*/ },
 128 };
 129
 130 static void exynos_map_pmu(void)
 131 {
 132         struct device_node *np;
 133
 134         np = of_find_matching_node(NULL, exynos_dt_pmu_match);
 135         if (np)
 136                 pmu_base_addr = of_iomap(np, 0);
 137 }
 138
 139 static void __init exynos_init_irq(void)
 140 {
 141         irqchip_init();
 142         /*
 143          * Since platsmp.c needs pmu base address by the time
 144          * DT is not unflatten so we can't use DT APIs before
 145          * init_irq
 146          */
 147         exynos_map_pmu();
 148 }
 149
 150 static void __init exynos_dt_machine_init(void)
 151 {
 152         /*
 153          * This is called from smp_prepare_cpus if we've built for SMP, but
 154          * we still need to set it up for PM and firmware ops if not.
 155          */
 156         if (!IS_ENABLED(CONFIG_SMP))
 157                 exynos_sysram_init();
 158
 159 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
 160         if (of_machine_is_compatible("samsung,exynos4210") ||
 161             of_machine_is_compatible("samsung,exynos3250"))
 162                 exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
 163 #endif
 164         if (of_machine_is_compatible("samsung,exynos4210") ||
 165             (of_machine_is_compatible("samsung,exynos4412") &&
 166              (of_machine_is_compatible("samsung,trats2") ||
 167                   of_machine_is_compatible("samsung,midas"))) ||
 168             of_machine_is_compatible("samsung,exynos3250") ||
 169             of_machine_is_compatible("samsung,exynos5250"))
 170                 platform_device_register(&exynos_cpuidle);
 171 }
 172
 173 static char const *const exynos_dt_compat[] __initconst = {
 174         "samsung,exynos3",
 175         "samsung,exynos3250",
 176         "samsung,exynos4",
 177         "samsung,exynos4210",
 178         "samsung,exynos4412",
 179         "samsung,exynos5",
 180         "samsung,exynos5250",
 181         "samsung,exynos5260",
 182         "samsung,exynos5420",
 183         NULL
 184 };
 185
 186 static void __init exynos_dt_fixup(void)
 187 {
 188         /*
 189          * Some versions of uboot pass garbage entries in the memory node,
 190          * use the old CONFIG_ARM_NR_BANKS
 191          */
 192         of_fdt_limit_memory(8);
 193 }
 194
 195 DT_MACHINE_START(EXYNOS_DT, "Samsung Exynos (Flattened Device Tree)")
 196         .l2c_aux_val    = 0x3c400001,
 197         .l2c_aux_mask   = 0xc20fffff,
 198         .smp            = smp_ops(exynos_smp_ops),
 199         .map_io         = exynos_init_io,
 200         .init_early     = exynos_firmware_init,
 201         .init_irq       = exynos_init_irq,
 202         .init_machine   = exynos_dt_machine_init,
 203         .init_late      = exynos_pm_init,
 204         .dt_compat      = exynos_dt_compat,
 205         .dt_fixup       = exynos_dt_fixup,
 206 MACHINE_END