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path: root/drivers/irqchip/irq-gic-pm.c
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Diffstat (limited to 'drivers/irqchip/irq-gic-pm.c')
-rw-r--r--drivers/irqchip/irq-gic-pm.c184
1 files changed, 184 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic-pm.c b/drivers/irqchip/irq-gic-pm.c
new file mode 100644
index 000000000000..4cbffba3ff13
--- /dev/null
+++ b/drivers/irqchip/irq-gic-pm.c
@@ -0,0 +1,184 @@
+/*
+ * 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)
+{
+ struct clk *clk;
+ 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++) {
+ clk = of_clk_get_by_name(dev->of_node, data->clocks[i]);
+ if (IS_ERR(clk)) {
+ dev_err(dev, "failed to get clock %s\n",
+ data->clocks[i]);
+ ret = PTR_ERR(clk);
+ goto error;
+ }
+
+ ret = pm_clk_add_clk(dev, clk);
+ if (ret) {
+ dev_err(dev, "failed to add clock at index %d\n", i);
+ clk_put(clk);
+ goto error;
+ }
+ }
+
+ return 0;
+
+error:
+ pm_clk_destroy(dev);
+
+ return ret;
+}
+
+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);