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1/*2 * Tegra ACONNECT Bus Driver3 *4 * Copyright (C) 2016, NVIDIA CORPORATION. All rights reserved.5 *6 * This file is subject to the terms and conditions of the GNU General Public7 * License. See the file "COPYING" in the main directory of this archive8 * 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 void tegra_aconnect_remove(struct platform_device *pdev)57{58 pm_runtime_disable(&pdev->dev);59}60 61static int tegra_aconnect_runtime_resume(struct device *dev)62{63 struct tegra_aconnect *aconnect = dev_get_drvdata(dev);64 int ret;65 66 ret = clk_prepare_enable(aconnect->ape_clk);67 if (ret) {68 dev_err(dev, "ape clk_enable failed: %d\n", ret);69 return ret;70 }71 72 ret = clk_prepare_enable(aconnect->apb2ape_clk);73 if (ret) {74 clk_disable_unprepare(aconnect->ape_clk);75 dev_err(dev, "apb2ape clk_enable failed: %d\n", ret);76 return ret;77 }78 79 return 0;80}81 82static int tegra_aconnect_runtime_suspend(struct device *dev)83{84 struct tegra_aconnect *aconnect = dev_get_drvdata(dev);85 86 clk_disable_unprepare(aconnect->ape_clk);87 clk_disable_unprepare(aconnect->apb2ape_clk);88 89 return 0;90}91 92static const struct dev_pm_ops tegra_aconnect_pm_ops = {93 SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend,94 tegra_aconnect_runtime_resume, NULL)95 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,96 pm_runtime_force_resume)97};98 99static const struct of_device_id tegra_aconnect_of_match[] = {100 { .compatible = "nvidia,tegra210-aconnect", },101 { }102};103MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match);104 105static struct platform_driver tegra_aconnect_driver = {106 .probe = tegra_aconnect_probe,107 .remove_new = tegra_aconnect_remove,108 .driver = {109 .name = "tegra-aconnect",110 .of_match_table = tegra_aconnect_of_match,111 .pm = &tegra_aconnect_pm_ops,112 },113};114module_platform_driver(tegra_aconnect_driver);115 116MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver");117MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");118MODULE_LICENSE("GPL v2");119