irq-gic-pm.c 3.58 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77
/*
 * Copyright (C) 2016 NVIDIA CORPORATION, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/irqchip/arm-gic.h>
#include <linux/platform_device.h>
#include <linux/pm_clock.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>

struct gic_clk_data {
	unsigned int num_clocks;
	const char *const *clocks;
};

static int gic_runtime_resume(struct device *dev)
{
	struct gic_chip_data *gic = dev_get_drvdata(dev);
	int ret;

	ret = pm_clk_resume(dev);
	if (ret)
		return ret;

	/*
	 * On the very first resume, the pointer to the driver data
	 * will be NULL and this is intentional, because we do not
	 * want to restore the GIC on the very first resume. So if
	 * the pointer is not valid just return.
	 */
	if (!gic)
		return 0;

	gic_dist_restore(gic);
	gic_cpu_restore(gic);

	return 0;
}

static int gic_runtime_suspend(struct device *dev)
{
	struct gic_chip_data *gic = dev_get_drvdata(dev);

	gic_dist_save(gic);
	gic_cpu_save(gic);

	return pm_clk_suspend(dev);
}

static int gic_get_clocks(struct device *dev, const struct gic_clk_data *data)
{
	unsigned int i;
	int ret;

	if (!dev || !data)
		return -EINVAL;

	ret = pm_clk_create(dev);
	if (ret)
		return ret;

	for (i = 0; i < data->num_clocks; i++) {
78
		ret = of_pm_clk_add_clk(dev, data->clocks[i]);
79
		if (ret) {
80 81 82 83
			dev_err(dev, "failed to add clock %s\n",
				data->clocks[i]);
			pm_clk_destroy(dev);
			return ret;
84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171
		}
	}

	return 0;
}

static int gic_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	const struct gic_clk_data *data;
	struct gic_chip_data *gic;
	int ret, irq;

	data = of_device_get_match_data(&pdev->dev);
	if (!data) {
		dev_err(&pdev->dev, "no device match found\n");
		return -ENODEV;
	}

	irq = irq_of_parse_and_map(dev->of_node, 0);
	if (!irq) {
		dev_err(dev, "no parent interrupt found!\n");
		return -EINVAL;
	}

	ret = gic_get_clocks(dev, data);
	if (ret)
		goto irq_dispose;

	pm_runtime_enable(dev);

	ret = pm_runtime_get_sync(dev);
	if (ret < 0)
		goto rpm_disable;

	ret = gic_of_init_child(dev, &gic, irq);
	if (ret)
		goto rpm_put;

	platform_set_drvdata(pdev, gic);

	pm_runtime_put(dev);

	dev_info(dev, "GIC IRQ controller registered\n");

	return 0;

rpm_put:
	pm_runtime_put_sync(dev);
rpm_disable:
	pm_runtime_disable(dev);
	pm_clk_destroy(dev);
irq_dispose:
	irq_dispose_mapping(irq);

	return ret;
}

static const struct dev_pm_ops gic_pm_ops = {
	SET_RUNTIME_PM_OPS(gic_runtime_suspend,
			   gic_runtime_resume, NULL)
};

static const char * const gic400_clocks[] = {
	"clk",
};

static const struct gic_clk_data gic400_data = {
	.num_clocks = ARRAY_SIZE(gic400_clocks),
	.clocks = gic400_clocks,
};

static const struct of_device_id gic_match[] = {
	{ .compatible = "nvidia,tegra210-agic",	.data = &gic400_data },
	{},
};
MODULE_DEVICE_TABLE(of, gic_match);

static struct platform_driver gic_driver = {
	.probe		= gic_probe,
	.driver		= {
		.name	= "gic",
		.of_match_table	= gic_match,
		.pm	= &gic_pm_ops,
	}
};

builtin_platform_driver(gic_driver);