[linux-2.6-block.git] / drivers / bus / tegra-aconnect.c

/*
 * Tegra ACONNECT Bus Driver
 *
 * Copyright (C) 2016, NVIDIA CORPORATION.  All rights reserved.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/clk.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>

struct tegra_aconnect {
	struct clk	*ape_clk;
	struct clk	*apb2ape_clk;
};

static int tegra_aconnect_probe(struct platform_device *pdev)
{
	struct tegra_aconnect *aconnect;

	if (!pdev->dev.of_node)
		return -EINVAL;

	aconnect = devm_kzalloc(&pdev->dev, sizeof(struct tegra_aconnect),
				GFP_KERNEL);
	if (!aconnect)
		return -ENOMEM;

	aconnect->ape_clk = devm_clk_get(&pdev->dev, "ape");
	if (IS_ERR(aconnect->ape_clk)) {
		dev_err(&pdev->dev, "Can't retrieve ape clock\n");
		return PTR_ERR(aconnect->ape_clk);
	}

	aconnect->apb2ape_clk = devm_clk_get(&pdev->dev, "apb2ape");
	if (IS_ERR(aconnect->apb2ape_clk)) {
		dev_err(&pdev->dev, "Can't retrieve apb2ape clock\n");
		return PTR_ERR(aconnect->apb2ape_clk);
	}

	dev_set_drvdata(&pdev->dev, aconnect);
	pm_runtime_enable(&pdev->dev);

	of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);

	dev_info(&pdev->dev, "Tegra ACONNECT bus registered\n");

	return 0;
}

static void tegra_aconnect_remove(struct platform_device *pdev)
{
	pm_runtime_disable(&pdev->dev);
}

static int tegra_aconnect_runtime_resume(struct device *dev)
{
	struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
	int ret;

	ret = clk_prepare_enable(aconnect->ape_clk);
	if (ret) {
		dev_err(dev, "ape clk_enable failed: %d\n", ret);
		return ret;
	}

	ret = clk_prepare_enable(aconnect->apb2ape_clk);
	if (ret) {
		clk_disable_unprepare(aconnect->ape_clk);
		dev_err(dev, "apb2ape clk_enable failed: %d\n", ret);
		return ret;
	}

	return 0;
}

static int tegra_aconnect_runtime_suspend(struct device *dev)
{
	struct tegra_aconnect *aconnect = dev_get_drvdata(dev);

	clk_disable_unprepare(aconnect->ape_clk);
	clk_disable_unprepare(aconnect->apb2ape_clk);

	return 0;
}

static const struct dev_pm_ops tegra_aconnect_pm_ops = {
	SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend,
			   tegra_aconnect_runtime_resume, NULL)
	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
				      pm_runtime_force_resume)
};

static const struct of_device_id tegra_aconnect_of_match[] = {
	{ .compatible = "nvidia,tegra210-aconnect", },
	{ }
};
MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match);

static struct platform_driver tegra_aconnect_driver = {
	.probe = tegra_aconnect_probe,
	.remove_new = tegra_aconnect_remove,
	.driver = {
		.name = "tegra-aconnect",
		.of_match_table = tegra_aconnect_of_match,
		.pm = &tegra_aconnect_pm_ops,
	},
};
module_platform_driver(tegra_aconnect_driver);

MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver");
MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
MODULE_LICENSE("GPL v2");
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>
46a88534 JH	15	#include <linux/pm_runtime.h>
46a88534 JH	16
0d7dab92 SP	17	struct tegra_aconnect {
	18	struct clk *ape_clk;
	19	struct clk *apb2ape_clk;
	20	};
	21
46a88534 JH	22	static int tegra_aconnect_probe(struct platform_device *pdev)
46a88534 JH	23	{
0d7dab92	24	struct tegra_aconnect *aconnect;
46a88534 JH	25
	26	if (!pdev->dev.of_node)
	27	return -EINVAL;
	28
0d7dab92 SP	29	aconnect = devm_kzalloc(&pdev->dev, sizeof(struct tegra_aconnect),
	30	GFP_KERNEL);
	31	if (!aconnect)
	32	return -ENOMEM;
46a88534	33
0d7dab92 SP	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	}
46a88534	39
0d7dab92 SP	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	}
46a88534	45
0d7dab92	46	dev_set_drvdata(&pdev->dev, aconnect);
46a88534 JH	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;
46a88534 JH	54	}
46a88534 JH	55
f54ba5ef	56	static void tegra_aconnect_remove(struct platform_device *pdev)
46a88534 JH	57	{
46a88534 JH	58	pm_runtime_disable(&pdev->dev);
46a88534 JH	59	}
	60
	61	static int tegra_aconnect_runtime_resume(struct device *dev)
	62	{
0d7dab92 SP	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;
46a88534 JH	80	}
	81
	82	static int tegra_aconnect_runtime_suspend(struct device *dev)
	83	{
0d7dab92 SP	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;
46a88534 JH	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)
1427736e SP	95	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
1427736e SP	96	pm_runtime_force_resume)
46a88534 JH	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,
f54ba5ef	107	.remove_new = tegra_aconnect_remove,
46a88534 JH	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");