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
33#define SGI_MASK 0xFFFF
34
35#ifdef CONFIG_PM_SLEEP
36static void __iomem *tegra_gic_cpu_base;
37#endif
38
39bool tegra_pending_sgi(void)
40{
41	u32 pending_set;
42	void __iomem *distbase = IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE);
43
44	pending_set = readl_relaxed(distbase + GIC_DIST_PENDING_SET);
45
46	if (pending_set & SGI_MASK)
47		return true;
48
49	return false;
50}
51
52#ifdef CONFIG_PM_SLEEP
53static int tegra_gic_notifier(struct notifier_block *self,
54			      unsigned long cmd, void *v)
55{
56	switch (cmd) {
57	case CPU_PM_ENTER:
58		writel_relaxed(0x1E0, tegra_gic_cpu_base + GIC_CPU_CTRL);
59		break;
60	}
61
62	return NOTIFY_OK;
63}
64
65static struct notifier_block tegra_gic_notifier_block = {
66	.notifier_call = tegra_gic_notifier,
67};
68
69static const struct of_device_id tegra114_dt_gic_match[] __initconst = {
70	{ .compatible = "arm,cortex-a15-gic" },
71	{ }
72};
73
74static void tegra114_gic_cpu_pm_registration(void)
75{
76	struct device_node *dn;
77
78	dn = of_find_matching_node(NULL, tegra114_dt_gic_match);
79	if (!dn)
80		return;
81
82	tegra_gic_cpu_base = of_iomap(dn, 1);
83
84	cpu_pm_register_notifier(&tegra_gic_notifier_block);
85}
86#else
87static void tegra114_gic_cpu_pm_registration(void) { }
88#endif
89
90static const struct of_device_id tegra_ictlr_match[] __initconst = {
91	{ .compatible = "nvidia,tegra20-ictlr" },
92	{ .compatible = "nvidia,tegra30-ictlr" },
93	{ }
94};
95
96void __init tegra_init_irq(void)
97{
98	if (WARN_ON(!of_find_matching_node(NULL, tegra_ictlr_match)))
99		pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
100
101	tegra114_gic_cpu_pm_registration();
102}
103