| Jon Hunter | 46a8853 | 2016-06-17 13:40:32 +0100 | [diff] [blame] | 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"); |