2 * Copyright (C) 2016 NVIDIA CORPORATION, All Rights Reserved.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 #include <linux/module.h>
17 #include <linux/clk.h>
18 #include <linux/of_device.h>
19 #include <linux/of_irq.h>
20 #include <linux/irqchip/arm-gic.h>
21 #include <linux/platform_device.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/slab.h>
26 unsigned int num_clocks;
27 const char *const *clocks;
31 struct gic_chip_data *chip_data;
32 const struct gic_clk_data *clk_data;
33 struct clk_bulk_data *clks;
36 static int gic_runtime_resume(struct device *dev)
38 struct gic_chip_pm *chip_pm = dev_get_drvdata(dev);
39 struct gic_chip_data *gic = chip_pm->chip_data;
40 const struct gic_clk_data *data = chip_pm->clk_data;
43 ret = clk_bulk_prepare_enable(data->num_clocks, chip_pm->clks);
45 dev_err(dev, "clk_enable failed: %d\n", ret);
50 * On the very first resume, the pointer to chip_pm->chip_data
51 * will be NULL and this is intentional, because we do not
52 * want to restore the GIC on the very first resume. So if
53 * the pointer is not valid just return.
58 gic_dist_restore(gic);
64 static int gic_runtime_suspend(struct device *dev)
66 struct gic_chip_pm *chip_pm = dev_get_drvdata(dev);
67 struct gic_chip_data *gic = chip_pm->chip_data;
68 const struct gic_clk_data *data = chip_pm->clk_data;
73 clk_bulk_disable_unprepare(data->num_clocks, chip_pm->clks);
78 static int gic_probe(struct platform_device *pdev)
80 struct device *dev = &pdev->dev;
81 const struct gic_clk_data *data;
82 struct gic_chip_pm *chip_pm;
85 data = of_device_get_match_data(&pdev->dev);
87 dev_err(&pdev->dev, "no device match found\n");
91 chip_pm = devm_kzalloc(dev, sizeof(*chip_pm), GFP_KERNEL);
95 irq = irq_of_parse_and_map(dev->of_node, 0);
97 dev_err(dev, "no parent interrupt found!\n");
101 chip_pm->clks = devm_kcalloc(dev, data->num_clocks,
102 sizeof(*chip_pm->clks), GFP_KERNEL);
106 for (i = 0; i < data->num_clocks; i++)
107 chip_pm->clks[i].id = data->clocks[i];
109 ret = devm_clk_bulk_get(dev, data->num_clocks, chip_pm->clks);
113 chip_pm->clk_data = data;
114 dev_set_drvdata(dev, chip_pm);
116 pm_runtime_enable(dev);
118 ret = pm_runtime_get_sync(dev);
122 ret = gic_of_init_child(dev, &chip_pm->chip_data, irq);
128 dev_info(dev, "GIC IRQ controller registered\n");
133 pm_runtime_put_sync(dev);
135 pm_runtime_disable(dev);
137 irq_dispose_mapping(irq);
142 static const struct dev_pm_ops gic_pm_ops = {
143 SET_RUNTIME_PM_OPS(gic_runtime_suspend,
144 gic_runtime_resume, NULL)
145 SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
146 pm_runtime_force_resume)
149 static const char * const gic400_clocks[] = {
153 static const struct gic_clk_data gic400_data = {
154 .num_clocks = ARRAY_SIZE(gic400_clocks),
155 .clocks = gic400_clocks,
158 static const struct of_device_id gic_match[] = {
159 { .compatible = "nvidia,tegra210-agic", .data = &gic400_data },
162 MODULE_DEVICE_TABLE(of, gic_match);
164 static struct platform_driver gic_driver = {
168 .of_match_table = gic_match,
173 builtin_platform_driver(gic_driver);