forked from Minki/linux
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
/*
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* Copyright (C) 2016 NVIDIA CORPORATION, All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/module.h>
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#include <linux/clk.h>
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#include <linux/of_device.h>
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#include <linux/of_irq.h>
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#include <linux/irqchip/arm-gic.h>
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#include <linux/platform_device.h>
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#include <linux/pm_clock.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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struct gic_clk_data {
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unsigned int num_clocks;
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const char *const *clocks;
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};
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static int gic_runtime_resume(struct device *dev)
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{
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struct gic_chip_data *gic = dev_get_drvdata(dev);
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int ret;
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ret = pm_clk_resume(dev);
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if (ret)
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return ret;
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/*
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* On the very first resume, the pointer to the driver data
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* will be NULL and this is intentional, because we do not
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* want to restore the GIC on the very first resume. So if
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* the pointer is not valid just return.
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*/
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if (!gic)
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return 0;
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gic_dist_restore(gic);
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gic_cpu_restore(gic);
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return 0;
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}
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static int gic_runtime_suspend(struct device *dev)
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{
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struct gic_chip_data *gic = dev_get_drvdata(dev);
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gic_dist_save(gic);
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gic_cpu_save(gic);
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return pm_clk_suspend(dev);
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}
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static int gic_get_clocks(struct device *dev, const struct gic_clk_data *data)
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{
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unsigned int i;
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int ret;
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if (!dev || !data)
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return -EINVAL;
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ret = pm_clk_create(dev);
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if (ret)
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return ret;
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for (i = 0; i < data->num_clocks; i++) {
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ret = of_pm_clk_add_clk(dev, data->clocks[i]);
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if (ret) {
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dev_err(dev, "failed to add clock %s\n",
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data->clocks[i]);
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pm_clk_destroy(dev);
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return ret;
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}
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}
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return 0;
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}
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static int gic_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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const struct gic_clk_data *data;
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struct gic_chip_data *gic;
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int ret, irq;
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data = of_device_get_match_data(&pdev->dev);
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if (!data) {
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dev_err(&pdev->dev, "no device match found\n");
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return -ENODEV;
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}
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irq = irq_of_parse_and_map(dev->of_node, 0);
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if (!irq) {
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dev_err(dev, "no parent interrupt found!\n");
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return -EINVAL;
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}
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ret = gic_get_clocks(dev, data);
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if (ret)
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goto irq_dispose;
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pm_runtime_enable(dev);
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ret = pm_runtime_get_sync(dev);
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if (ret < 0)
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goto rpm_disable;
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ret = gic_of_init_child(dev, &gic, irq);
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if (ret)
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goto rpm_put;
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platform_set_drvdata(pdev, gic);
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pm_runtime_put(dev);
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dev_info(dev, "GIC IRQ controller registered\n");
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return 0;
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rpm_put:
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pm_runtime_put_sync(dev);
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rpm_disable:
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pm_runtime_disable(dev);
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pm_clk_destroy(dev);
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irq_dispose:
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irq_dispose_mapping(irq);
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return ret;
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}
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static const struct dev_pm_ops gic_pm_ops = {
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SET_RUNTIME_PM_OPS(gic_runtime_suspend,
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gic_runtime_resume, NULL)
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};
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static const char * const gic400_clocks[] = {
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"clk",
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};
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static const struct gic_clk_data gic400_data = {
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.num_clocks = ARRAY_SIZE(gic400_clocks),
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.clocks = gic400_clocks,
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};
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static const struct of_device_id gic_match[] = {
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{ .compatible = "nvidia,tegra210-agic", .data = &gic400_data },
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{},
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};
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MODULE_DEVICE_TABLE(of, gic_match);
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static struct platform_driver gic_driver = {
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.probe = gic_probe,
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.driver = {
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.name = "gic",
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.of_match_table = gic_match,
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.pm = &gic_pm_ops,
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}
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};
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builtin_platform_driver(gic_driver);
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