1// SPDX-License-Identifier: GPL-2.0
  2/**
  3 * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
  4 *
  5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
  6 *		http://www.samsung.com
  7 *
  8 * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
  9 */
 10
 11#include <linux/module.h>
 12#include <linux/kernel.h>
 13#include <linux/slab.h>
 14#include <linux/platform_device.h>
 15#include <linux/clk.h>
 16#include <linux/of.h>
 17#include <linux/of_platform.h>
 18#include <linux/regulator/consumer.h>
 19
 20#define DWC3_EXYNOS_MAX_CLOCKS	4
 21
 22struct dwc3_exynos_driverdata {
 23	const char		*clk_names[DWC3_EXYNOS_MAX_CLOCKS];
 24	int			num_clks;
 25	int			suspend_clk_idx;
 26};
 27
 28struct dwc3_exynos {
 29	struct device		*dev;
 30
 31	const char		**clk_names;
 32	struct clk		*clks[DWC3_EXYNOS_MAX_CLOCKS];
 33	int			num_clks;
 34	int			suspend_clk_idx;
 35
 36	struct regulator	*vdd33;
 37	struct regulator	*vdd10;
 38};
 39
 40static int dwc3_exynos_remove_child(struct device *dev, void *unused)
 41{
 42	struct platform_device *pdev = to_platform_device(dev);
 43
 44	platform_device_unregister(pdev);
 45
 46	return 0;
 47}
 48
 49static int dwc3_exynos_probe(struct platform_device *pdev)
 50{
 51	struct dwc3_exynos	*exynos;
 52	struct device		*dev = &pdev->dev;
 53	struct device_node	*node = dev->of_node;
 54	const struct dwc3_exynos_driverdata *driver_data;
 55	int			i, ret;
 56
 57	exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
 58	if (!exynos)
 59		return -ENOMEM;
 60
 61	driver_data = of_device_get_match_data(dev);
 62	exynos->dev = dev;
 63	exynos->num_clks = driver_data->num_clks;
 64	exynos->clk_names = (const char **)driver_data->clk_names;
 65	exynos->suspend_clk_idx = driver_data->suspend_clk_idx;
 66
 67	platform_set_drvdata(pdev, exynos);
 68
 69	for (i = 0; i < exynos->num_clks; i++) {
 70		exynos->clks[i] = devm_clk_get(dev, exynos->clk_names[i]);
 71		if (IS_ERR(exynos->clks[i])) {
 72			dev_err(dev, "failed to get clock: %s\n",
 73				exynos->clk_names[i]);
 74			return PTR_ERR(exynos->clks[i]);
 75		}
 76	}
 77
 78	for (i = 0; i < exynos->num_clks; i++) {
 79		ret = clk_prepare_enable(exynos->clks[i]);
 80		if (ret) {
 81			while (i-- > 0)
 82				clk_disable_unprepare(exynos->clks[i]);
 83			return ret;
 84		}
 85	}
 86
 87	if (exynos->suspend_clk_idx >= 0)
 88		clk_prepare_enable(exynos->clks[exynos->suspend_clk_idx]);
 89
 90	exynos->vdd33 = devm_regulator_get(dev, "vdd33");
 91	if (IS_ERR(exynos->vdd33)) {
 92		ret = PTR_ERR(exynos->vdd33);
 93		goto vdd33_err;
 94	}
 95	ret = regulator_enable(exynos->vdd33);
 96	if (ret) {
 97		dev_err(dev, "Failed to enable VDD33 supply\n");
 98		goto vdd33_err;
 99	}
100
101	exynos->vdd10 = devm_regulator_get(dev, "vdd10");
102	if (IS_ERR(exynos->vdd10)) {
103		ret = PTR_ERR(exynos->vdd10);
104		goto vdd10_err;
105	}
106	ret = regulator_enable(exynos->vdd10);
107	if (ret) {
108		dev_err(dev, "Failed to enable VDD10 supply\n");
109		goto vdd10_err;
110	}
111
112	if (node) {
113		ret = of_platform_populate(node, NULL, NULL, dev);
114		if (ret) {
115			dev_err(dev, "failed to add dwc3 core\n");
116			goto populate_err;
117		}
118	} else {
119		dev_err(dev, "no device node, failed to add dwc3 core\n");
120		ret = -ENODEV;
121		goto populate_err;
122	}
123
124	return 0;
125
126populate_err:
127	regulator_disable(exynos->vdd10);
128vdd10_err:
129	regulator_disable(exynos->vdd33);
130vdd33_err:
131	for (i = exynos->num_clks - 1; i >= 0; i--)
132		clk_disable_unprepare(exynos->clks[i]);
133
134	if (exynos->suspend_clk_idx >= 0)
135		clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]);
136
137	return ret;
138}
139
140static int dwc3_exynos_remove(struct platform_device *pdev)
141{
142	struct dwc3_exynos	*exynos = platform_get_drvdata(pdev);
143	int i;
144
145	device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
146
147	for (i = exynos->num_clks - 1; i >= 0; i--)
148		clk_disable_unprepare(exynos->clks[i]);
149
150	if (exynos->suspend_clk_idx >= 0)
151		clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]);
152
153	regulator_disable(exynos->vdd33);
154	regulator_disable(exynos->vdd10);
155
156	return 0;
157}
158
159static const struct dwc3_exynos_driverdata exynos5250_drvdata = {
160	.clk_names = { "usbdrd30" },
161	.num_clks = 1,
162	.suspend_clk_idx = -1,
163};
164
165static const struct dwc3_exynos_driverdata exynos5433_drvdata = {
166	.clk_names = { "aclk", "susp_clk", "pipe_pclk", "phyclk" },
167	.num_clks = 4,
168	.suspend_clk_idx = 1,
169};
170
171static const struct dwc3_exynos_driverdata exynos7_drvdata = {
172	.clk_names = { "usbdrd30", "usbdrd30_susp_clk", "usbdrd30_axius_clk" },
173	.num_clks = 3,
174	.suspend_clk_idx = 1,
175};
176
177static const struct of_device_id exynos_dwc3_match[] = {
178	{
179		.compatible = "samsung,exynos5250-dwusb3",
180		.data = &exynos5250_drvdata,
181	}, {
182		.compatible = "samsung,exynos5433-dwusb3",
183		.data = &exynos5433_drvdata,
184	}, {
185		.compatible = "samsung,exynos7-dwusb3",
186		.data = &exynos7_drvdata,
187	}, {
188	}
189};
190MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
191
192#ifdef CONFIG_PM_SLEEP
193static int dwc3_exynos_suspend(struct device *dev)
194{
195	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
196	int i;
197
198	for (i = exynos->num_clks - 1; i >= 0; i--)
199		clk_disable_unprepare(exynos->clks[i]);
200
201	regulator_disable(exynos->vdd33);
202	regulator_disable(exynos->vdd10);
203
204	return 0;
205}
206
207static int dwc3_exynos_resume(struct device *dev)
208{
209	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
210	int i, ret;
211
212	ret = regulator_enable(exynos->vdd33);
213	if (ret) {
214		dev_err(dev, "Failed to enable VDD33 supply\n");
215		return ret;
216	}
217	ret = regulator_enable(exynos->vdd10);
218	if (ret) {
219		dev_err(dev, "Failed to enable VDD10 supply\n");
220		return ret;
221	}
222
223	for (i = 0; i < exynos->num_clks; i++) {
224		ret = clk_prepare_enable(exynos->clks[i]);
225		if (ret) {
226			while (i-- > 0)
227				clk_disable_unprepare(exynos->clks[i]);
228			return ret;
229		}
230	}
231
232	return 0;
233}
234
235static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
236	SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
237};
238
239#define DEV_PM_OPS	(&dwc3_exynos_dev_pm_ops)
240#else
241#define DEV_PM_OPS	NULL
242#endif /* CONFIG_PM_SLEEP */
243
244static struct platform_driver dwc3_exynos_driver = {
245	.probe		= dwc3_exynos_probe,
246	.remove		= dwc3_exynos_remove,
247	.driver		= {
248		.name	= "exynos-dwc3",
249		.of_match_table = exynos_dwc3_match,
250		.pm	= DEV_PM_OPS,
251	},
252};
253
254module_platform_driver(dwc3_exynos_driver);
255
256MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
257MODULE_LICENSE("GPL v2");
258MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");