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120 lines
2.9 KiB
120 lines
2.9 KiB
/* |
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* Tegra ACONNECT Bus Driver |
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* |
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* Copyright (C) 2016, NVIDIA CORPORATION. All rights reserved. |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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*/ |
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#include <linux/clk.h> |
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#include <linux/module.h> |
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#include <linux/of_platform.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_runtime.h> |
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struct tegra_aconnect { |
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struct clk *ape_clk; |
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struct clk *apb2ape_clk; |
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}; |
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static int tegra_aconnect_probe(struct platform_device *pdev) |
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{ |
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struct tegra_aconnect *aconnect; |
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if (!pdev->dev.of_node) |
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return -EINVAL; |
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aconnect = devm_kzalloc(&pdev->dev, sizeof(struct tegra_aconnect), |
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GFP_KERNEL); |
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if (!aconnect) |
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return -ENOMEM; |
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aconnect->ape_clk = devm_clk_get(&pdev->dev, "ape"); |
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if (IS_ERR(aconnect->ape_clk)) { |
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dev_err(&pdev->dev, "Can't retrieve ape clock\n"); |
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return PTR_ERR(aconnect->ape_clk); |
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} |
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aconnect->apb2ape_clk = devm_clk_get(&pdev->dev, "apb2ape"); |
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if (IS_ERR(aconnect->apb2ape_clk)) { |
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dev_err(&pdev->dev, "Can't retrieve apb2ape clock\n"); |
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return PTR_ERR(aconnect->apb2ape_clk); |
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} |
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dev_set_drvdata(&pdev->dev, aconnect); |
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pm_runtime_enable(&pdev->dev); |
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of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); |
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dev_info(&pdev->dev, "Tegra ACONNECT bus registered\n"); |
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return 0; |
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} |
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static int tegra_aconnect_remove(struct platform_device *pdev) |
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{ |
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pm_runtime_disable(&pdev->dev); |
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return 0; |
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} |
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static int tegra_aconnect_runtime_resume(struct device *dev) |
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{ |
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struct tegra_aconnect *aconnect = dev_get_drvdata(dev); |
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int ret; |
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ret = clk_prepare_enable(aconnect->ape_clk); |
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if (ret) { |
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dev_err(dev, "ape clk_enable failed: %d\n", ret); |
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return ret; |
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} |
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ret = clk_prepare_enable(aconnect->apb2ape_clk); |
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if (ret) { |
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clk_disable_unprepare(aconnect->ape_clk); |
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dev_err(dev, "apb2ape clk_enable failed: %d\n", ret); |
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return ret; |
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} |
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return 0; |
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} |
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static int tegra_aconnect_runtime_suspend(struct device *dev) |
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{ |
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struct tegra_aconnect *aconnect = dev_get_drvdata(dev); |
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clk_disable_unprepare(aconnect->ape_clk); |
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clk_disable_unprepare(aconnect->apb2ape_clk); |
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return 0; |
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} |
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static const struct dev_pm_ops tegra_aconnect_pm_ops = { |
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SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend, |
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tegra_aconnect_runtime_resume, NULL) |
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SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, |
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pm_runtime_force_resume) |
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}; |
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static const struct of_device_id tegra_aconnect_of_match[] = { |
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{ .compatible = "nvidia,tegra210-aconnect", }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match); |
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static struct platform_driver tegra_aconnect_driver = { |
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.probe = tegra_aconnect_probe, |
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.remove = tegra_aconnect_remove, |
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.driver = { |
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.name = "tegra-aconnect", |
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.of_match_table = tegra_aconnect_of_match, |
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.pm = &tegra_aconnect_pm_ops, |
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}, |
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}; |
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module_platform_driver(tegra_aconnect_driver); |
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MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver"); |
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MODULE_AUTHOR("Jon Hunter <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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