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
29static void __iomem *tegra_gic_cpu_base;
30#endif
31
32bool 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
46static 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
58static struct notifier_block tegra_gic_notifier_block = {
59 .notifier_call = tegra_gic_notifier,
60};
61
62static const struct of_device_id tegra114_dt_gic_match[] __initconst = {
63 { .compatible = "arm,cortex-a15-gic" },
64 { }
65};
66
67static void __init tegra114_gic_cpu_pm_registration(void)
68{
69 struct device_node *dn;
70
71 dn = of_find_matching_node(NULL, matches: tegra114_dt_gic_match);
72 if (!dn)
73 return;
74
75 tegra_gic_cpu_base = of_iomap(node: dn, index: 1);
76
77 cpu_pm_register_notifier(nb: &tegra_gic_notifier_block);
78}
79#else
80static void __init tegra114_gic_cpu_pm_registration(void) { }
81#endif
82
83static const struct of_device_id tegra_ictlr_match[] __initconst = {
84 { .compatible = "nvidia,tegra20-ictlr" },
85 { .compatible = "nvidia,tegra30-ictlr" },
86 { }
87};
88
89void __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92 pr_warn("Outdated DT detected, suspend/resume will NOT work\n");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}
96

source code of linux/arch/arm/mach-tegra/irq.c