projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 46a88534 JH |
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_clock.h> | |
| 16 | #include <linux/pm_runtime.h> | |
| 17 | ||
| 18 | static int tegra_aconnect_add_clock(struct device *dev, char *name) | |
| 19 | { | |
| 20 | struct clk *clk; | |
| 21 | int ret; | |
| 22 | ||
| 23 | clk = clk_get(dev, name); | |
| 24 | if (IS_ERR(clk)) { | |
| 25 | dev_err(dev, "%s clock not found\n", name); | |
| 26 | return PTR_ERR(clk); | |
| 27 | } | |
| 28 | ||
| 29 | ret = pm_clk_add_clk(dev, clk); | |
| 30 | if (ret) | |
| 31 | clk_put(clk); | |
| 32 | ||
| 33 | return ret; | |
| 34 | } | |
| 35 | ||
| 36 | static int tegra_aconnect_probe(struct platform_device *pdev) | |
| 37 | { | |
| 38 | int ret; | |
| 39 | ||
| 40 | if (!pdev->dev.of_node) | |
| 41 | return -EINVAL; | |
| 42 | ||
| 43 | ret = pm_clk_create(&pdev->dev); | |
| 44 | if (ret) | |
| 45 | return ret; | |
| 46 | ||
| 47 | ret = tegra_aconnect_add_clock(&pdev->dev, "ape"); | |
| 48 | if (ret) | |
| 49 | goto clk_destroy; | |
| 50 | ||
| 51 | ret = tegra_aconnect_add_clock(&pdev->dev, "apb2ape"); | |
| 52 | if (ret) | |
| 53 | goto clk_destroy; | |
| 54 | ||
| 55 | pm_runtime_enable(&pdev->dev); | |
| 56 | ||
| 57 | of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); | |
| 58 | ||
| 59 | dev_info(&pdev->dev, "Tegra ACONNECT bus registered\n"); | |
| 60 | ||
| 61 | return 0; | |
| 62 | ||
| 63 | clk_destroy: | |
| 64 | pm_clk_destroy(&pdev->dev); | |
| 65 | ||
| 66 | return ret; | |
| 67 | } | |
| 68 | ||
| 69 | static int tegra_aconnect_remove(struct platform_device *pdev) | |
| 70 | { | |
| 71 | pm_runtime_disable(&pdev->dev); | |
| 72 | ||
| 73 | pm_clk_destroy(&pdev->dev); | |
| 74 | ||
| 75 | return 0; | |
| 76 | } | |
| 77 | ||
| 78 | static int tegra_aconnect_runtime_resume(struct device *dev) | |
| 79 | { | |
| 80 | return pm_clk_resume(dev); | |
| 81 | } | |
| 82 | ||
| 83 | static int tegra_aconnect_runtime_suspend(struct device *dev) | |
| 84 | { | |
| 85 | return pm_clk_suspend(dev); | |
| 86 | } | |
| 87 | ||
| 88 | static const struct dev_pm_ops tegra_aconnect_pm_ops = { | |
| 89 | SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend, | |
| 90 | tegra_aconnect_runtime_resume, NULL) | |
| 91 | }; | |
| 92 | ||
| 93 | static const struct of_device_id tegra_aconnect_of_match[] = { | |
| 94 | { .compatible = "nvidia,tegra210-aconnect", }, | |
| 95 | { } | |
| 96 | }; | |
| 97 | MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match); | |
| 98 | ||
| 99 | static struct platform_driver tegra_aconnect_driver = { | |
| 100 | .probe = tegra_aconnect_probe, | |
| 101 | .remove = tegra_aconnect_remove, | |
| 102 | .driver = { | |
| 103 | .name = "tegra-aconnect", | |
| 104 | .of_match_table = tegra_aconnect_of_match, | |
| 105 | .pm = &tegra_aconnect_pm_ops, | |
| 106 | }, | |
| 107 | }; | |
| 108 | module_platform_driver(tegra_aconnect_driver); | |
| 109 | ||
| 110 | MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver"); | |
| 111 | MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>"); | |
| 112 | MODULE_LICENSE("GPL v2"); |