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/*
* 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_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) {
dev_err(dev, "clk_enable failed: %d\n", 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_get_sync(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);
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