forked from Minki/linux
caab277b1d
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 503 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
163 lines
3.5 KiB
C
163 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2016 NVIDIA CORPORATION, All Rights Reserved.
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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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