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 17 struct tegra_aconnect { 18 struct clk *ape_clk; 19 struct clk *apb2ape_clk; 20 }; 21 22 static 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 56 static int tegra_aconnect_remove(struct platform_device *pdev) 57 { 58 pm_runtime_disable(&pdev->dev); 59 60 return 0; 61 } 62 63 static 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 84 static 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 94 static 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 }; 100 101 static const struct of_device_id tegra_aconnect_of_match[] = { 102 { .compatible = "nvidia,tegra210-aconnect", }, 103 { } 104 }; 105 MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match); 106 107 static 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 }; 116 module_platform_driver(tegra_aconnect_driver); 117 118 MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver"); 119 MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>"); 120 MODULE_LICENSE("GPL v2"); 121