[deliverable/linux.git] / drivers / usb / dwc3 / dwc3-of-simple.c

/**
 * dwc3-of-simple.c - OF glue layer for simple integrations
 *
 * Copyright (c) 2015 Texas Instruments Incorporated - http://www.ti.com
 *
 * Author: Felipe Balbi <balbi@ti.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2  of
 * the License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * This is a combination of the old dwc3-qcom.c by Ivan T. Ivanov
 * <iivanov@mm-sol.com> and the original patch adding support for Xilinx' SoC
 * by Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>

struct dwc3_of_simple {
	struct device		*dev;
	struct clk		**clks;
	int			num_clocks;
};

static int dwc3_of_simple_probe(struct platform_device *pdev)
{
	struct dwc3_of_simple	*simple;
	struct device		*dev = &pdev->dev;
	struct device_node	*np = dev->of_node;

	int			ret;
	int			i;

	simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
	if (!simple)
		return -ENOMEM;

	ret = of_clk_get_parent_count(np);
	if (ret < 0)
		return ret;

	simple->num_clocks = ret;

	simple->clks = devm_kcalloc(dev, simple->num_clocks,
			sizeof(struct clk *), GFP_KERNEL);
	if (!simple->clks)
		return -ENOMEM;

	simple->dev = dev;

	for (i = 0; i < simple->num_clocks; i++) {
		struct clk	*clk;

		clk = of_clk_get(np, i);
		if (IS_ERR(clk)) {
			while (--i >= 0)
				clk_put(simple->clks[i]);
			return PTR_ERR(clk);
		}

		ret = clk_prepare_enable(clk);
		if (ret < 0) {
			while (--i >= 0) {
				clk_disable_unprepare(simple->clks[i]);
				clk_put(simple->clks[i]);
			}
			clk_put(clk);

			return ret;
		}

		simple->clks[i] = clk;
	}

	ret = of_platform_populate(np, NULL, NULL, dev);
	if (ret) {
		for (i = 0; i < simple->num_clocks; i++) {
			clk_disable_unprepare(simple->clks[i]);
			clk_put(simple->clks[i]);
		}

		return ret;
	}

	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);
	pm_runtime_get_sync(dev);

	return 0;
}

static int dwc3_of_simple_remove(struct platform_device *pdev)
{
	struct dwc3_of_simple	*simple = platform_get_drvdata(pdev);
	struct device		*dev = &pdev->dev;
	int			i;

	for (i = 0; i < simple->num_clocks; i++) {
		clk_unprepare(simple->clks[i]);
		clk_put(simple->clks[i]);
	}

	of_platform_depopulate(dev);

	pm_runtime_put_sync(dev);
	pm_runtime_disable(dev);

	return 0;
}

static int dwc3_of_simple_runtime_suspend(struct device *dev)
{
	struct dwc3_of_simple	*simple = dev_get_drvdata(dev);
	int			i;

	for (i = 0; i < simple->num_clocks; i++)
		clk_disable(simple->clks[i]);

	return 0;
}

static int dwc3_of_simple_runtime_resume(struct device *dev)
{
	struct dwc3_of_simple	*simple = dev_get_drvdata(dev);
	int			ret;
	int			i;

	for (i = 0; i < simple->num_clocks; i++) {
		ret = clk_enable(simple->clks[i]);
		if (ret < 0) {
			while (--i >= 0)
				clk_disable(simple->clks[i]);
			return ret;
		}
	}

	return 0;
}

static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
	SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
			dwc3_of_simple_runtime_resume, NULL)
};

static const struct of_device_id of_dwc3_simple_match[] = {
	{ .compatible = "qcom,dwc3" },
	{ .compatible = "xlnx,zynqmp-dwc3" },
	{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);

static struct platform_driver dwc3_of_simple_driver = {
	.probe		= dwc3_of_simple_probe,
	.remove		= dwc3_of_simple_remove,
	.driver		= {
		.name	= "dwc3-of-simple",
		.of_match_table = of_dwc3_simple_match,
	},
};

module_platform_driver(dwc3_of_simple_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer");
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
Commit	Line	Data
16adc674 FB	1	/**
	2	* dwc3-of-simple.c - OF glue layer for simple integrations
	3	*
	4	* Copyright (c) 2015 Texas Instruments Incorporated - http://www.ti.com
	5	*
	6	* Author: Felipe Balbi <balbi@ti.com>
	7	*
	8	* This program is free software: you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 of
	10	* the License as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* This is a combination of the old dwc3-qcom.c by Ivan T. Ivanov
	18	* <iivanov@mm-sol.com> and the original patch adding support for Xilinx' SoC
	19	* by Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com>
	20	*/
	21
	22	#include <linux/module.h>
	23	#include <linux/kernel.h>
	24	#include <linux/slab.h>
	25	#include <linux/platform_device.h>
	26	#include <linux/dma-mapping.h>
	27	#include <linux/clk.h>
	28	#include <linux/clk-provider.h>
	29	#include <linux/of.h>
	30	#include <linux/of_platform.h>
	31	#include <linux/pm_runtime.h>
	32
	33	struct dwc3_of_simple {
	34	struct device *dev;
	35	struct clk **clks;
	36	int num_clocks;
	37	};
	38
	39	static int dwc3_of_simple_probe(struct platform_device *pdev)
	40	{
	41	struct dwc3_of_simple *simple;
	42	struct device *dev = &pdev->dev;
	43	struct device_node *np = dev->of_node;
	44
	45	int ret;
	46	int i;
	47
	48	simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
	49	if (!simple)
	50	return -ENOMEM;
	51
	52	ret = of_clk_get_parent_count(np);
	53	if (ret < 0)
	54	return ret;
	55
	56	simple->num_clocks = ret;
	57
	58	simple->clks = devm_kcalloc(dev, simple->num_clocks,
	59	sizeof(struct clk *), GFP_KERNEL);
	60	if (!simple->clks)
	61	return -ENOMEM;
	62
	63	simple->dev = dev;
	64
65	for (i = 0; i < simple->num_clocks; i++) {
66	struct clk *clk;
67
68	clk = of_clk_get(np, i);
69	if (IS_ERR(clk)) {
70	while (--i >= 0)
71	clk_put(simple->clks[i]);
72	return PTR_ERR(clk);
73	}
74
75	ret = clk_prepare_enable(clk);
76	if (ret < 0) {
77	while (--i >= 0) {
78	clk_disable_unprepare(simple->clks[i]);
79	clk_put(simple->clks[i]);
80	}
81	clk_put(clk);
82
83	return ret;
84	}
85
86	simple->clks[i] = clk;
87	}
88
89	ret = of_platform_populate(np, NULL, NULL, dev);
90	if (ret) {
91	for (i = 0; i < simple->num_clocks; i++) {
92	clk_disable_unprepare(simple->clks[i]);
93	clk_put(simple->clks[i]);
94	}
95
96	return ret;
97	}
98
99	pm_runtime_set_active(dev);
100	pm_runtime_enable(dev);
101	pm_runtime_get_sync(dev);
102
103	return 0;
104	}
105
106	static int dwc3_of_simple_remove(struct platform_device *pdev)
107	{
108	struct dwc3_of_simple *simple = platform_get_drvdata(pdev);
109	struct device *dev = &pdev->dev;
110	int i;
111
112	for (i = 0; i < simple->num_clocks; i++) {
113	clk_unprepare(simple->clks[i]);
114	clk_put(simple->clks[i]);
115	}
116
117	of_platform_depopulate(dev);
118
119	pm_runtime_put_sync(dev);
120	pm_runtime_disable(dev);
121
122	return 0;
123	}
124
125	static int dwc3_of_simple_runtime_suspend(struct device *dev)
126	{
127	struct dwc3_of_simple *simple = dev_get_drvdata(dev);
128	int i;
129
130	for (i = 0; i < simple->num_clocks; i++)
131	clk_disable(simple->clks[i]);
132
133	return 0;
134	}
135
136	static int dwc3_of_simple_runtime_resume(struct device *dev)
137	{
138	struct dwc3_of_simple *simple = dev_get_drvdata(dev);
139	int ret;
140	int i;
141
142	for (i = 0; i < simple->num_clocks; i++) {
143	ret = clk_enable(simple->clks[i]);
144	if (ret < 0) {
145	while (--i >= 0)
146	clk_disable(simple->clks[i]);
147	return ret;
148	}
149	}
150
151	return 0;
152	}
153
154	static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
155	SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
156	dwc3_of_simple_runtime_resume, NULL)
157	};
158
159	static const struct of_device_id of_dwc3_simple_match[] = {
160	{ .compatible = "qcom,dwc3" },
161	{ .compatible = "xlnx,zynqmp-dwc3" },
162	{ /* Sentinel */ }
163	};
164	MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);
165
166	static struct platform_driver dwc3_of_simple_driver = {
167	.probe = dwc3_of_simple_probe,
168	.remove = dwc3_of_simple_remove,
169	.driver = {
170	.name = "dwc3-of-simple",
171	.of_match_table = of_dwc3_simple_match,
172	},
173	};
174
175	module_platform_driver(dwc3_of_simple_driver);
176	MODULE_LICENSE("GPL v2");
177	MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer");
178	MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");