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 return dev_err_probe(&pdev->dev, PTR_ERR(aconnect->ape_clk), 37 "can't retrieve ape clock\n"); 38 39 aconnect->apb2ape_clk = devm_clk_get(&pdev->dev, "apb2ape"); 40 if (IS_ERR(aconnect->apb2ape_clk)) 41 return dev_err_probe(&pdev->dev, PTR_ERR(aconnect->apb2ape_clk), 42 "can't retrieve apb2ape clock\n"); 43 44 dev_set_drvdata(&pdev->dev, aconnect); 45 pm_runtime_enable(&pdev->dev); 46 47 of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); 48 49 dev_info(&pdev->dev, "Tegra ACONNECT bus registered\n"); 50 51 return 0; 52 } 53 54 static void tegra_aconnect_remove(struct platform_device *pdev) 55 { 56 pm_runtime_disable(&pdev->dev); 57 } 58 59 static int tegra_aconnect_runtime_resume(struct device *dev) 60 { 61 struct tegra_aconnect *aconnect = dev_get_drvdata(dev); 62 int ret; 63 64 ret = clk_prepare_enable(aconnect->ape_clk); 65 if (ret) { 66 dev_err(dev, "ape clk_enable failed: %d\n", ret); 67 return ret; 68 } 69 70 ret = clk_prepare_enable(aconnect->apb2ape_clk); 71 if (ret) { 72 clk_disable_unprepare(aconnect->ape_clk); 73 dev_err(dev, "apb2ape clk_enable failed: %d\n", ret); 74 return ret; 75 } 76 77 return 0; 78 } 79 80 static int tegra_aconnect_runtime_suspend(struct device *dev) 81 { 82 struct tegra_aconnect *aconnect = dev_get_drvdata(dev); 83 84 clk_disable_unprepare(aconnect->ape_clk); 85 clk_disable_unprepare(aconnect->apb2ape_clk); 86 87 return 0; 88 } 89 90 static const struct dev_pm_ops tegra_aconnect_pm_ops = { 91 SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend, 92 tegra_aconnect_runtime_resume, NULL) 93 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 94 pm_runtime_force_resume) 95 }; 96 97 static const struct of_device_id tegra_aconnect_of_match[] = { 98 { .compatible = "nvidia,tegra210-aconnect", }, 99 { } 100 }; 101 MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match); 102 103 static struct platform_driver tegra_aconnect_driver = { 104 .probe = tegra_aconnect_probe, 105 .remove = tegra_aconnect_remove, 106 .driver = { 107 .name = "tegra-aconnect", 108 .of_match_table = tegra_aconnect_of_match, 109 .pm = &tegra_aconnect_pm_ops, 110 }, 111 }; 112 module_platform_driver(tegra_aconnect_driver); 113 114 MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver"); 115 MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>"); 116 MODULE_LICENSE("GPL v2"); 117