1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2016 NVIDIA CORPORATION, All Rights Reserved.
  4 */
  5#include <linux/module.h>
  6#include <linux/clk.h>
  7#include <linux/of.h>
  8#include <linux/of_irq.h>
  9#include <linux/irqchip/arm-gic.h>
 10#include <linux/platform_device.h>
 11#include <linux/pm_runtime.h>
 12#include <linux/slab.h>
 13
 14struct gic_clk_data {
 15	unsigned int num_clocks;
 16	const char *const *clocks;
 17};
 18
 19struct gic_chip_pm {
 20	struct gic_chip_data *chip_data;
 21	const struct gic_clk_data *clk_data;
 22	struct clk_bulk_data *clks;
 23};
 24
 25static int gic_runtime_resume(struct device *dev)
 26{
 27	struct gic_chip_pm *chip_pm = dev_get_drvdata(dev);
 28	struct gic_chip_data *gic = chip_pm->chip_data;
 29	const struct gic_clk_data *data = chip_pm->clk_data;
 30	int ret;
 31
 32	ret = clk_bulk_prepare_enable(data->num_clocks, chip_pm->clks);
 33	if (ret)
 34		return ret;
 35
 36	/*
 37	 * On the very first resume, the pointer to chip_pm->chip_data
 38	 * will be NULL and this is intentional, because we do not
 39	 * want to restore the GIC on the very first resume. So if
 40	 * the pointer is not valid just return.
 41	 */
 42	if (!gic)
 43		return 0;
 44
 45	gic_dist_restore(gic);
 46	gic_cpu_restore(gic);
 47
 48	return 0;
 49}
 50
 51static int gic_runtime_suspend(struct device *dev)
 52{
 53	struct gic_chip_pm *chip_pm = dev_get_drvdata(dev);
 54	struct gic_chip_data *gic = chip_pm->chip_data;
 55	const struct gic_clk_data *data = chip_pm->clk_data;
 56
 57	gic_dist_save(gic);
 58	gic_cpu_save(gic);
 59
 60	clk_bulk_disable_unprepare(data->num_clocks, chip_pm->clks);
 61
 62	return 0;
 63}
 64
 65static int gic_probe(struct platform_device *pdev)
 66{
 67	struct device *dev = &pdev->dev;
 68	const struct gic_clk_data *data;
 69	struct gic_chip_pm *chip_pm;
 70	int ret, irq, i;
 71
 72	data = of_device_get_match_data(&pdev->dev);
 73	if (!data) {
 74		dev_err(&pdev->dev, "no device match found\n");
 75		return -ENODEV;
 76	}
 77
 78	chip_pm = devm_kzalloc(dev, sizeof(*chip_pm), GFP_KERNEL);
 79	if (!chip_pm)
 80		return -ENOMEM;
 81
 82	irq = irq_of_parse_and_map(dev->of_node, 0);
 83	if (!irq) {
 84		dev_err(dev, "no parent interrupt found!\n");
 85		return -EINVAL;
 86	}
 87
 88	chip_pm->clks = devm_kcalloc(dev, data->num_clocks,
 89				     sizeof(*chip_pm->clks), GFP_KERNEL);
 90	if (!chip_pm->clks)
 91		return -ENOMEM;
 92
 93	for (i = 0; i < data->num_clocks; i++)
 94		chip_pm->clks[i].id = data->clocks[i];
 95
 96	ret = devm_clk_bulk_get(dev, data->num_clocks, chip_pm->clks);
 97	if (ret)
 98		goto irq_dispose;
 99
100	chip_pm->clk_data = data;
101	dev_set_drvdata(dev, chip_pm);
102
103	pm_runtime_enable(dev);
104
105	ret = pm_runtime_resume_and_get(dev);
106	if (ret < 0)
107		goto rpm_disable;
108
109	ret = gic_of_init_child(dev, &chip_pm->chip_data, irq);
110	if (ret)
111		goto rpm_put;
112
113	pm_runtime_put(dev);
114
115	dev_info(dev, "GIC IRQ controller registered\n");
116
117	return 0;
118
119rpm_put:
120	pm_runtime_put_sync(dev);
121rpm_disable:
122	pm_runtime_disable(dev);
123irq_dispose:
124	irq_dispose_mapping(irq);
125
126	return ret;
127}
128
129static const struct dev_pm_ops gic_pm_ops = {
130	SET_RUNTIME_PM_OPS(gic_runtime_suspend,
131			   gic_runtime_resume, NULL)
132	SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
133				     pm_runtime_force_resume)
134};
135
136static const char * const gic400_clocks[] = {
137	"clk",
138};
139
140static const struct gic_clk_data gic400_data = {
141	.num_clocks = ARRAY_SIZE(gic400_clocks),
142	.clocks = gic400_clocks,
143};
144
145static const struct of_device_id gic_match[] = {
146	{ .compatible = "nvidia,tegra210-agic",	.data = &gic400_data },
147	{},
148};
149MODULE_DEVICE_TABLE(of, gic_match);
150
151static struct platform_driver gic_driver = {
152	.probe		= gic_probe,
153	.driver		= {
154		.name	= "gic",
155		.of_match_table	= gic_match,
156		.pm	= &gic_pm_ops,
157	}
158};
159
160builtin_platform_driver(gic_driver);