mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 14:55:48 +07:00
39a342b252
Commit 498b5fdd40 ("PM / clk: Add support for adding a specific clock
from device-tree") add a new helper function for adding a clock from
device-tree to a device. Update the GIC-PM driver to use this new
function to simplify the driver.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
172 lines
3.6 KiB
C
172 lines
3.6 KiB
C
/*
|
|
* 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++) {
|
|
ret = of_pm_clk_add_clk(dev, data->clocks[i]);
|
|
if (ret) {
|
|
dev_err(dev, "failed to add clock %s\n",
|
|
data->clocks[i]);
|
|
pm_clk_destroy(dev);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
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);
|