arch/arm/mach-tegra/irq.c

   1 /*
   2  * Copyright (C) 2011 Google, Inc.
   3  *
   4  * Author:
   5  *      Colin Cross <ccross@android.com>
   6  *
   7  * Copyright (C) 2010,2013, NVIDIA Corporation
   8  *
   9  * This software is licensed under the terms of the GNU General Public
  10  * License version 2, as published by the Free Software Foundation, and
  11  * may be copied, distributed, and modified under those terms.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  */
  19
  20 #include <linux/cpu_pm.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/io.h>
  23 #include <linux/irqchip/arm-gic.h>
  24 #include <linux/irq.h>
  25 #include <linux/kernel.h>
  26 #include <linux/of_address.h>
  27 #include <linux/of.h>
  28 #include <linux/syscore_ops.h>
  29
  30 #include "board.h"
  31 #include "iomap.h"
  32 #include "irq.h"
  33
  34 #define SGI_MASK 0xFFFF
  35
  36 #ifdef CONFIG_PM_SLEEP
  37 static void __iomem *tegra_gic_cpu_base;
  38 #endif
  39
  40 bool tegra_pending_sgi(void)
  41 {
  42         u32 pending_set;
  43         void __iomem *distbase = IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE);
  44
  45         pending_set = readl_relaxed(distbase + GIC_DIST_PENDING_SET);
  46
  47         if (pending_set & SGI_MASK)
  48                 return true;
  49
  50         return false;
  51 }
  52
  53 #ifdef CONFIG_PM_SLEEP
  54 static int tegra_gic_notifier(struct notifier_block *self,
  55                               unsigned long cmd, void *v)
  56 {
  57         switch (cmd) {
  58         case CPU_PM_ENTER:
  59                 writel_relaxed(0x1E0, tegra_gic_cpu_base + GIC_CPU_CTRL);
  60                 break;
  61         }
  62
  63         return NOTIFY_OK;
  64 }
  65
  66 static struct notifier_block tegra_gic_notifier_block = {
  67         .notifier_call = tegra_gic_notifier,
  68 };
  69
  70 static const struct of_device_id tegra114_dt_gic_match[] __initconst = {
  71         { .compatible = "arm,cortex-a15-gic" },
  72         { }
  73 };
  74
  75 static void tegra114_gic_cpu_pm_registration(void)
  76 {
  77         struct device_node *dn;
  78
  79         dn = of_find_matching_node(NULL, tegra114_dt_gic_match);
  80         if (!dn)
  81                 return;
  82
  83         tegra_gic_cpu_base = of_iomap(dn, 1);
  84
  85         cpu_pm_register_notifier(&tegra_gic_notifier_block);
  86 }
  87 #else
  88 static void tegra114_gic_cpu_pm_registration(void) { }
  89 #endif
  90
  91 static const struct of_device_id tegra_ictlr_match[] __initconst = {
  92         { .compatible = "nvidia,tegra20-ictlr" },
  93         { .compatible = "nvidia,tegra30-ictlr" },
  94         { }
  95 };
  96
  97 void __init tegra_init_irq(void)
  98 {
  99         if (WARN_ON(!of_find_matching_node(NULL, tegra_ictlr_match)))
 100                 pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
 101
 102         tegra114_gic_cpu_pm_registration();
 103 }