cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tegra-aconnect.c (3003B)

      1/*
      2 * Tegra ACONNECT Bus Driver
      3 *
      4 * Copyright (C) 2016, NVIDIA CORPORATION.  All rights reserved.
      5 *
      6 * This file is subject to the terms and conditions of the GNU General Public
      7 * License.  See the file "COPYING" in the main directory of this archive
      8 * for more details.
      9 */
     10
     11#include <linux/clk.h>
     12#include <linux/module.h>
     13#include <linux/of_platform.h>
     14#include <linux/platform_device.h>
     15#include <linux/pm_runtime.h>
     16
     17struct tegra_aconnect {
     18	struct clk	*ape_clk;
     19	struct clk	*apb2ape_clk;
     20};
     21
     22static int tegra_aconnect_probe(struct platform_device *pdev)
     23{
     24	struct tegra_aconnect *aconnect;
     25
     26	if (!pdev->dev.of_node)
     27		return -EINVAL;
     28
     29	aconnect = devm_kzalloc(&pdev->dev, sizeof(struct tegra_aconnect),
     30				GFP_KERNEL);
     31	if (!aconnect)
     32		return -ENOMEM;
     33
     34	aconnect->ape_clk = devm_clk_get(&pdev->dev, "ape");
     35	if (IS_ERR(aconnect->ape_clk)) {
     36		dev_err(&pdev->dev, "Can't retrieve ape clock\n");
     37		return PTR_ERR(aconnect->ape_clk);
     38	}
     39
     40	aconnect->apb2ape_clk = devm_clk_get(&pdev->dev, "apb2ape");
     41	if (IS_ERR(aconnect->apb2ape_clk)) {
     42		dev_err(&pdev->dev, "Can't retrieve apb2ape clock\n");
     43		return PTR_ERR(aconnect->apb2ape_clk);
     44	}
     45
     46	dev_set_drvdata(&pdev->dev, aconnect);
     47	pm_runtime_enable(&pdev->dev);
     48
     49	of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
     50
     51	dev_info(&pdev->dev, "Tegra ACONNECT bus registered\n");
     52
     53	return 0;
     54}
     55
     56static int tegra_aconnect_remove(struct platform_device *pdev)
     57{
     58	pm_runtime_disable(&pdev->dev);
     59
     60	return 0;
     61}
     62
     63static int tegra_aconnect_runtime_resume(struct device *dev)
     64{
     65	struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
     66	int ret;
     67
     68	ret = clk_prepare_enable(aconnect->ape_clk);
     69	if (ret) {
     70		dev_err(dev, "ape clk_enable failed: %d\n", ret);
     71		return ret;
     72	}
     73
     74	ret = clk_prepare_enable(aconnect->apb2ape_clk);
     75	if (ret) {
     76		clk_disable_unprepare(aconnect->ape_clk);
     77		dev_err(dev, "apb2ape clk_enable failed: %d\n", ret);
     78		return ret;
     79	}
     80
     81	return 0;
     82}
     83
     84static int tegra_aconnect_runtime_suspend(struct device *dev)
     85{
     86	struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
     87
     88	clk_disable_unprepare(aconnect->ape_clk);
     89	clk_disable_unprepare(aconnect->apb2ape_clk);
     90
     91	return 0;
     92}
     93
     94static const struct dev_pm_ops tegra_aconnect_pm_ops = {
     95	SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend,
     96			   tegra_aconnect_runtime_resume, NULL)
     97	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
     98				      pm_runtime_force_resume)
     99};
    100
    101static const struct of_device_id tegra_aconnect_of_match[] = {
    102	{ .compatible = "nvidia,tegra210-aconnect", },
    103	{ }
    104};
    105MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match);
    106
    107static struct platform_driver tegra_aconnect_driver = {
    108	.probe = tegra_aconnect_probe,
    109	.remove = tegra_aconnect_remove,
    110	.driver = {
    111		.name = "tegra-aconnect",
    112		.of_match_table = tegra_aconnect_of_match,
    113		.pm = &tegra_aconnect_pm_ops,
    114	},
    115};
    116module_platform_driver(tegra_aconnect_driver);
    117
    118MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver");
    119MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
    120MODULE_LICENSE("GPL v2");