174 lines
4.0 KiB
C
174 lines
4.0 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_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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struct gic_chip_pm {
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struct gic_chip_data *chip_data;
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const struct gic_clk_data *clk_data;
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struct clk_bulk_data *clks;
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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_pm *chip_pm = dev_get_drvdata(dev);
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struct gic_chip_data *gic = chip_pm->chip_data;
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const struct gic_clk_data *data = chip_pm->clk_data;
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int ret;
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ret = clk_bulk_prepare_enable(data->num_clocks, chip_pm->clks);
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if (ret) {
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dev_err(dev, "clk_enable failed: %d\n", ret);
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return ret;
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}
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/*
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* On the very first resume, the pointer to chip_pm->chip_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_pm *chip_pm = dev_get_drvdata(dev);
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struct gic_chip_data *gic = chip_pm->chip_data;
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const struct gic_clk_data *data = chip_pm->clk_data;
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gic_dist_save(gic);
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gic_cpu_save(gic);
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clk_bulk_disable_unprepare(data->num_clocks, chip_pm->clks);
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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_pm *chip_pm;
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int ret, irq, i;
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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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chip_pm = devm_kzalloc(dev, sizeof(*chip_pm), GFP_KERNEL);
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if (!chip_pm)
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return -ENOMEM;
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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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chip_pm->clks = devm_kcalloc(dev, data->num_clocks,
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sizeof(*chip_pm->clks), GFP_KERNEL);
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if (!chip_pm->clks)
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return -ENOMEM;
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for (i = 0; i < data->num_clocks; i++)
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chip_pm->clks[i].id = data->clocks[i];
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ret = devm_clk_bulk_get(dev, data->num_clocks, chip_pm->clks);
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if (ret)
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goto irq_dispose;
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chip_pm->clk_data = data;
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dev_set_drvdata(dev, chip_pm);
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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, &chip_pm->chip_data, irq);
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if (ret)
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goto rpm_put;
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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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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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SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
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pm_runtime_force_resume)
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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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