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 void tegra_aconnect_remove(struct platform_device *pdev) 57 { 58 pm_runtime_disable(&pdev->dev); 59 } 60 61 static 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 82 static 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 92 static 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 99 static const struct of_device_id tegra_aconnect_of_match[] = { 100 { .compatible = "nvidia,tegra210-aconnect", }, 101 { } 102 }; 103 MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match); 104 105 static 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 }; 114 module_platform_driver(tegra_aconnect_driver); 115 116 MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver"); 117 MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>"); 118 MODULE_LICENSE("GPL v2"); 119