1 files changed, 160 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic-pm.c b/drivers/irqchip/irq-gic-pm.c
new file mode 100644
index 000000000..3989d16f9
--- /dev/null
+++ b/drivers/irqchip/irq-gic-pm.c
@@ -0,0 +1,160 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2016 NVIDIA CORPORATION, All Rights Reserved.
+ */
+#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_runtime.h>
+#include <linux/slab.h>
+
+struct gic_clk_data {
+	unsigned int num_clocks;
+	const char *const *clocks;
+};
+
+struct gic_chip_pm {
+	struct gic_chip_data *chip_data;
+	const struct gic_clk_data *clk_data;
+	struct clk_bulk_data *clks;
+};
+
+static int gic_runtime_resume(struct device *dev)
+{
+	struct gic_chip_pm *chip_pm = dev_get_drvdata(dev);
+	struct gic_chip_data *gic = chip_pm->chip_data;
+	const struct gic_clk_data *data = chip_pm->clk_data;
+	int ret;
+
+	ret = clk_bulk_prepare_enable(data->num_clocks, chip_pm->clks);
+	if (ret)
+		return ret;
+
+	/*
+	 * On the very first resume, the pointer to chip_pm->chip_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_pm *chip_pm = dev_get_drvdata(dev);
+	struct gic_chip_data *gic = chip_pm->chip_data;
+	const struct gic_clk_data *data = chip_pm->clk_data;
+
+	gic_dist_save(gic);
+	gic_cpu_save(gic);
+
+	clk_bulk_disable_unprepare(data->num_clocks, chip_pm->clks);
+
+	return 0;
+}
+
+static int gic_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct gic_clk_data *data;
+	struct gic_chip_pm *chip_pm;
+	int ret, irq, i;
+
+	data = of_device_get_match_data(&pdev->dev);
+	if (!data) {
+		dev_err(&pdev->dev, "no device match found\n");
+		return -ENODEV;
+	}
+
+	chip_pm = devm_kzalloc(dev, sizeof(*chip_pm), GFP_KERNEL);
+	if (!chip_pm)
+		return -ENOMEM;
+
+	irq = irq_of_parse_and_map(dev->of_node, 0);
+	if (!irq) {
+		dev_err(dev, "no parent interrupt found!\n");
+		return -EINVAL;
+	}
+
+	chip_pm->clks = devm_kcalloc(dev, data->num_clocks,
+				     sizeof(*chip_pm->clks), GFP_KERNEL);
+	if (!chip_pm->clks)
+		return -ENOMEM;
+
+	for (i = 0; i < data->num_clocks; i++)
+		chip_pm->clks[i].id = data->clocks[i];
+
+	ret = devm_clk_bulk_get(dev, data->num_clocks, chip_pm->clks);
+	if (ret)
+		goto irq_dispose;
+
+	chip_pm->clk_data = data;
+	dev_set_drvdata(dev, chip_pm);
+
+	pm_runtime_enable(dev);
+
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret < 0)
+		goto rpm_disable;
+
+	ret = gic_of_init_child(dev, &chip_pm->chip_data, irq);
+	if (ret)
+		goto rpm_put;
+
+	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);
+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)
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				     pm_runtime_force_resume)
+};
+
+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);