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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");
1/**
2 * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com
6 *
7 * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
8 *
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 of
11 * the License as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18
19#include <linux/module.h>
20#include <linux/kernel.h>
21#include <linux/slab.h>
22#include <linux/platform_device.h>
23#include <linux/clk.h>
24#include <linux/usb/otg.h>
25#include <linux/usb/usb_phy_generic.h>
26#include <linux/of.h>
27#include <linux/of_platform.h>
28#include <linux/regulator/consumer.h>
29
30struct dwc3_exynos {
31 struct platform_device *usb2_phy;
32 struct platform_device *usb3_phy;
33 struct device *dev;
34
35 struct clk *clk;
36 struct clk *susp_clk;
37 struct clk *axius_clk;
38
39 struct regulator *vdd33;
40 struct regulator *vdd10;
41};
42
43static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
44{
45 struct usb_phy_generic_platform_data pdata;
46 struct platform_device *pdev;
47 int ret;
48
49 memset(&pdata, 0x00, sizeof(pdata));
50
51 pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
52 if (!pdev)
53 return -ENOMEM;
54
55 exynos->usb2_phy = pdev;
56 pdata.type = USB_PHY_TYPE_USB2;
57 pdata.gpio_reset = -1;
58
59 ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
60 if (ret)
61 goto err1;
62
63 pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
64 if (!pdev) {
65 ret = -ENOMEM;
66 goto err1;
67 }
68
69 exynos->usb3_phy = pdev;
70 pdata.type = USB_PHY_TYPE_USB3;
71
72 ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
73 if (ret)
74 goto err2;
75
76 ret = platform_device_add(exynos->usb2_phy);
77 if (ret)
78 goto err2;
79
80 ret = platform_device_add(exynos->usb3_phy);
81 if (ret)
82 goto err3;
83
84 return 0;
85
86err3:
87 platform_device_del(exynos->usb2_phy);
88
89err2:
90 platform_device_put(exynos->usb3_phy);
91
92err1:
93 platform_device_put(exynos->usb2_phy);
94
95 return ret;
96}
97
98static int dwc3_exynos_remove_child(struct device *dev, void *unused)
99{
100 struct platform_device *pdev = to_platform_device(dev);
101
102 platform_device_unregister(pdev);
103
104 return 0;
105}
106
107static int dwc3_exynos_probe(struct platform_device *pdev)
108{
109 struct dwc3_exynos *exynos;
110 struct device *dev = &pdev->dev;
111 struct device_node *node = dev->of_node;
112
113 int ret;
114
115 exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
116 if (!exynos)
117 return -ENOMEM;
118
119 platform_set_drvdata(pdev, exynos);
120
121 exynos->dev = dev;
122
123 exynos->clk = devm_clk_get(dev, "usbdrd30");
124 if (IS_ERR(exynos->clk)) {
125 dev_err(dev, "couldn't get clock\n");
126 return -EINVAL;
127 }
128 clk_prepare_enable(exynos->clk);
129
130 exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
131 if (IS_ERR(exynos->susp_clk)) {
132 dev_info(dev, "no suspend clk specified\n");
133 exynos->susp_clk = NULL;
134 }
135 clk_prepare_enable(exynos->susp_clk);
136
137 if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
138 exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
139 if (IS_ERR(exynos->axius_clk)) {
140 dev_err(dev, "no AXI UpScaler clk specified\n");
141 ret = -ENODEV;
142 goto axius_clk_err;
143 }
144 clk_prepare_enable(exynos->axius_clk);
145 } else {
146 exynos->axius_clk = NULL;
147 }
148
149 exynos->vdd33 = devm_regulator_get(dev, "vdd33");
150 if (IS_ERR(exynos->vdd33)) {
151 ret = PTR_ERR(exynos->vdd33);
152 goto err2;
153 }
154 ret = regulator_enable(exynos->vdd33);
155 if (ret) {
156 dev_err(dev, "Failed to enable VDD33 supply\n");
157 goto err2;
158 }
159
160 exynos->vdd10 = devm_regulator_get(dev, "vdd10");
161 if (IS_ERR(exynos->vdd10)) {
162 ret = PTR_ERR(exynos->vdd10);
163 goto err3;
164 }
165 ret = regulator_enable(exynos->vdd10);
166 if (ret) {
167 dev_err(dev, "Failed to enable VDD10 supply\n");
168 goto err3;
169 }
170
171 ret = dwc3_exynos_register_phys(exynos);
172 if (ret) {
173 dev_err(dev, "couldn't register PHYs\n");
174 goto err4;
175 }
176
177 if (node) {
178 ret = of_platform_populate(node, NULL, NULL, dev);
179 if (ret) {
180 dev_err(dev, "failed to add dwc3 core\n");
181 goto err5;
182 }
183 } else {
184 dev_err(dev, "no device node, failed to add dwc3 core\n");
185 ret = -ENODEV;
186 goto err5;
187 }
188
189 return 0;
190
191err5:
192 platform_device_unregister(exynos->usb2_phy);
193 platform_device_unregister(exynos->usb3_phy);
194err4:
195 regulator_disable(exynos->vdd10);
196err3:
197 regulator_disable(exynos->vdd33);
198err2:
199 clk_disable_unprepare(exynos->axius_clk);
200axius_clk_err:
201 clk_disable_unprepare(exynos->susp_clk);
202 clk_disable_unprepare(exynos->clk);
203 return ret;
204}
205
206static int dwc3_exynos_remove(struct platform_device *pdev)
207{
208 struct dwc3_exynos *exynos = platform_get_drvdata(pdev);
209
210 device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
211 platform_device_unregister(exynos->usb2_phy);
212 platform_device_unregister(exynos->usb3_phy);
213
214 clk_disable_unprepare(exynos->axius_clk);
215 clk_disable_unprepare(exynos->susp_clk);
216 clk_disable_unprepare(exynos->clk);
217
218 regulator_disable(exynos->vdd33);
219 regulator_disable(exynos->vdd10);
220
221 return 0;
222}
223
224static const struct of_device_id exynos_dwc3_match[] = {
225 { .compatible = "samsung,exynos5250-dwusb3" },
226 { .compatible = "samsung,exynos7-dwusb3" },
227 {},
228};
229MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
230
231#ifdef CONFIG_PM_SLEEP
232static int dwc3_exynos_suspend(struct device *dev)
233{
234 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
235
236 clk_disable(exynos->axius_clk);
237 clk_disable(exynos->clk);
238
239 regulator_disable(exynos->vdd33);
240 regulator_disable(exynos->vdd10);
241
242 return 0;
243}
244
245static int dwc3_exynos_resume(struct device *dev)
246{
247 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
248 int ret;
249
250 ret = regulator_enable(exynos->vdd33);
251 if (ret) {
252 dev_err(dev, "Failed to enable VDD33 supply\n");
253 return ret;
254 }
255 ret = regulator_enable(exynos->vdd10);
256 if (ret) {
257 dev_err(dev, "Failed to enable VDD10 supply\n");
258 return ret;
259 }
260
261 clk_enable(exynos->clk);
262 clk_enable(exynos->axius_clk);
263
264 /* runtime set active to reflect active state. */
265 pm_runtime_disable(dev);
266 pm_runtime_set_active(dev);
267 pm_runtime_enable(dev);
268
269 return 0;
270}
271
272static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
273 SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
274};
275
276#define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops)
277#else
278#define DEV_PM_OPS NULL
279#endif /* CONFIG_PM_SLEEP */
280
281static struct platform_driver dwc3_exynos_driver = {
282 .probe = dwc3_exynos_probe,
283 .remove = dwc3_exynos_remove,
284 .driver = {
285 .name = "exynos-dwc3",
286 .of_match_table = exynos_dwc3_match,
287 .pm = DEV_PM_OPS,
288 },
289};
290
291module_platform_driver(dwc3_exynos_driver);
292
293MODULE_ALIAS("platform:exynos-dwc3");
294MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
295MODULE_LICENSE("GPL v2");
296MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");