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