xref: /openbmc/linux/arch/arm/mach-tegra/irq.c (revision 7741868f)
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 
tegra_pending_sgi(void)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
tegra_gic_notifier(struct notifier_block * self,unsigned long cmd,void * v)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 
tegra114_gic_cpu_pm_registration(void)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
tegra114_gic_cpu_pm_registration(void)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 
tegra_init_irq(void)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92 		pr_warn("Outdated DT detected, suspend/resume will NOT work\n");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 }
96