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 "board.h"
  22 #include "iomap.h"
  23 #include "irq.h"
  24
  25 #define SGI_MASK 0xFFFF
  26
  27 #ifdef CONFIG_PM_SLEEP
  28 static void __iomem *tegra_gic_cpu_base;
  29 #endif
  30
  31 bool tegra_pending_sgi(void)
  32 {
  33         u32 pending_set;
  34         void __iomem *distbase = IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE);
  35
  36         pending_set = readl_relaxed(distbase + GIC_DIST_PENDING_SET);
  37
  38         if (pending_set & SGI_MASK)
  39                 return true;
  40
  41         return false;
  42 }
  43
  44 #ifdef CONFIG_PM_SLEEP
  45 static int tegra_gic_notifier(struct notifier_block *self,
  46                               unsigned long cmd, void *v)
  47 {
  48         switch (cmd) {
  49         case CPU_PM_ENTER:
  50                 writel_relaxed(0x1E0, tegra_gic_cpu_base + GIC_CPU_CTRL);
  51                 break;
  52         }
  53
  54         return NOTIFY_OK;
  55 }
  56
  57 static struct notifier_block tegra_gic_notifier_block = {
  58         .notifier_call = tegra_gic_notifier,
  59 };
  60
  61 static const struct of_device_id tegra114_dt_gic_match[] __initconst = {
  62         { .compatible = "arm,cortex-a15-gic" },
  63         { }
  64 };
  65
  66 static void __init tegra114_gic_cpu_pm_registration(void)
  67 {
  68         struct device_node *dn;
  69
  70         dn = of_find_matching_node(NULL, tegra114_dt_gic_match);
  71         if (!dn)
  72                 return;
  73
  74         tegra_gic_cpu_base = of_iomap(dn, 1);
  75
  76         cpu_pm_register_notifier(&tegra_gic_notifier_block);
  77 }
  78 #else
  79 static void __init tegra114_gic_cpu_pm_registration(void) { }
  80 #endif
  81
  82 static const struct of_device_id tegra_ictlr_match[] __initconst = {
  83         { .compatible = "nvidia,tegra20-ictlr" },
  84         { .compatible = "nvidia,tegra30-ictlr" },
  85         { }
  86 };
  87
  88 void __init tegra_init_irq(void)
  89 {
  90         if (WARN_ON(!of_find_matching_node(NULL, tegra_ictlr_match)))
  91                 pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
  92
  93         tegra114_gic_cpu_pm_registration();
  94 }