arch/arm/mach-tegra/irq.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2011 Google, Inc.
   4  *
   5  * Author:
   6  *      Colin Cross <ccross@android.com>
   7  *
   8  * Copyright (C) 2010,2013, NVIDIA Corporation
   9  */
  10
  11 #include <linux/cpu_pm.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/io.h>
  14 #include <linux/irqchip/arm-gic.h>
  15 #include <linux/irq.h>
  16 #include <linux/kernel.h>
  17 #include <linux/of_address.h>
  18 #include <linux/of.h>
  19 #include <linux/syscore_ops.h>
  20
  21 #include <soc/tegra/irq.h>
  22
  23 #include "board.h"
  24 #include "iomap.h"
  25
  26 #define SGI_MASK 0xFFFF
  27
  28 #ifdef CONFIG_PM_SLEEP
  29 static void __iomem *tegra_gic_cpu_base;
  30 #endif
  31
  32 bool tegra_pending_sgi(void)
  33 {
  34         u32 pending_set;
  35         void __iomem *distbase = IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE);
  36
  37         pending_set = readl_relaxed(distbase + GIC_DIST_PENDING_SET);
  38
  39         if (pending_set & SGI_MASK)
  40                 return true;
  41
  42         return false;
  43 }
  44
  45 #ifdef CONFIG_PM_SLEEP
  46 static int tegra_gic_notifier(struct notifier_block *self,
  47                               unsigned long cmd, void *v)
  48 {
  49         switch (cmd) {
  50         case CPU_PM_ENTER:
  51                 writel_relaxed(0x1E0, tegra_gic_cpu_base + GIC_CPU_CTRL);
  52                 break;
  53         }
  54
  55         return NOTIFY_OK;
  56 }
  57
  58 static struct notifier_block tegra_gic_notifier_block = {
  59         .notifier_call = tegra_gic_notifier,
  60 };
  61
  62 static const struct of_device_id tegra114_dt_gic_match[] __initconst = {
  63         { .compatible = "arm,cortex-a15-gic" },
  64         { }
  65 };
  66
  67 static void __init tegra114_gic_cpu_pm_registration(void)
  68 {
  69         struct device_node *dn;
  70
  71         dn = of_find_matching_node(NULL, tegra114_dt_gic_match);
  72         if (!dn)
  73                 return;
  74
  75         tegra_gic_cpu_base = of_iomap(dn, 1);
  76
  77         cpu_pm_register_notifier(&tegra_gic_notifier_block);
  78 }
  79 #else
  80 static void __init tegra114_gic_cpu_pm_registration(void) { }
  81 #endif
  82
  83 static const struct of_device_id tegra_ictlr_match[] __initconst = {
  84         { .compatible = "nvidia,tegra20-ictlr" },
  85         { .compatible = "nvidia,tegra30-ictlr" },
  86         { }
  87 };
  88
  89 void __init tegra_init_irq(void)
  90 {
  91         if (WARN_ON(!of_find_matching_node(NULL, tegra_ictlr_match)))
  92                 pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
  93
  94         tegra114_gic_cpu_pm_registration();
  95 }