Loading...
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_probe(struct platform_device *pdev)
41{
42 struct dwc3_exynos *exynos;
43 struct device *dev = &pdev->dev;
44 struct device_node *node = dev->of_node;
45 const struct dwc3_exynos_driverdata *driver_data;
46 int i, ret;
47
48 exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
49 if (!exynos)
50 return -ENOMEM;
51
52 driver_data = of_device_get_match_data(dev);
53 exynos->dev = dev;
54 exynos->num_clks = driver_data->num_clks;
55 exynos->clk_names = (const char **)driver_data->clk_names;
56 exynos->suspend_clk_idx = driver_data->suspend_clk_idx;
57
58 platform_set_drvdata(pdev, exynos);
59
60 for (i = 0; i < exynos->num_clks; i++) {
61 exynos->clks[i] = devm_clk_get(dev, exynos->clk_names[i]);
62 if (IS_ERR(exynos->clks[i])) {
63 dev_err(dev, "failed to get clock: %s\n",
64 exynos->clk_names[i]);
65 return PTR_ERR(exynos->clks[i]);
66 }
67 }
68
69 for (i = 0; i < exynos->num_clks; i++) {
70 ret = clk_prepare_enable(exynos->clks[i]);
71 if (ret) {
72 while (i-- > 0)
73 clk_disable_unprepare(exynos->clks[i]);
74 return ret;
75 }
76 }
77
78 if (exynos->suspend_clk_idx >= 0)
79 clk_prepare_enable(exynos->clks[exynos->suspend_clk_idx]);
80
81 exynos->vdd33 = devm_regulator_get(dev, "vdd33");
82 if (IS_ERR(exynos->vdd33)) {
83 ret = PTR_ERR(exynos->vdd33);
84 goto vdd33_err;
85 }
86 ret = regulator_enable(exynos->vdd33);
87 if (ret) {
88 dev_err(dev, "Failed to enable VDD33 supply\n");
89 goto vdd33_err;
90 }
91
92 exynos->vdd10 = devm_regulator_get(dev, "vdd10");
93 if (IS_ERR(exynos->vdd10)) {
94 ret = PTR_ERR(exynos->vdd10);
95 goto vdd10_err;
96 }
97 ret = regulator_enable(exynos->vdd10);
98 if (ret) {
99 dev_err(dev, "Failed to enable VDD10 supply\n");
100 goto vdd10_err;
101 }
102
103 if (node) {
104 ret = of_platform_populate(node, NULL, NULL, dev);
105 if (ret) {
106 dev_err(dev, "failed to add dwc3 core\n");
107 goto populate_err;
108 }
109 } else {
110 dev_err(dev, "no device node, failed to add dwc3 core\n");
111 ret = -ENODEV;
112 goto populate_err;
113 }
114
115 return 0;
116
117populate_err:
118 regulator_disable(exynos->vdd10);
119vdd10_err:
120 regulator_disable(exynos->vdd33);
121vdd33_err:
122 for (i = exynos->num_clks - 1; i >= 0; i--)
123 clk_disable_unprepare(exynos->clks[i]);
124
125 if (exynos->suspend_clk_idx >= 0)
126 clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]);
127
128 return ret;
129}
130
131static void dwc3_exynos_remove(struct platform_device *pdev)
132{
133 struct dwc3_exynos *exynos = platform_get_drvdata(pdev);
134 int i;
135
136 of_platform_depopulate(&pdev->dev);
137
138 for (i = exynos->num_clks - 1; i >= 0; i--)
139 clk_disable_unprepare(exynos->clks[i]);
140
141 if (exynos->suspend_clk_idx >= 0)
142 clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]);
143
144 regulator_disable(exynos->vdd33);
145 regulator_disable(exynos->vdd10);
146}
147
148static const struct dwc3_exynos_driverdata exynos5250_drvdata = {
149 .clk_names = { "usbdrd30" },
150 .num_clks = 1,
151 .suspend_clk_idx = -1,
152};
153
154static const struct dwc3_exynos_driverdata exynos5433_drvdata = {
155 .clk_names = { "aclk", "susp_clk", "pipe_pclk", "phyclk" },
156 .num_clks = 4,
157 .suspend_clk_idx = 1,
158};
159
160static const struct dwc3_exynos_driverdata exynos7_drvdata = {
161 .clk_names = { "usbdrd30", "usbdrd30_susp_clk", "usbdrd30_axius_clk" },
162 .num_clks = 3,
163 .suspend_clk_idx = 1,
164};
165
166static const struct dwc3_exynos_driverdata exynos850_drvdata = {
167 .clk_names = { "bus_early", "ref" },
168 .num_clks = 2,
169 .suspend_clk_idx = -1,
170};
171
172static const struct of_device_id exynos_dwc3_match[] = {
173 {
174 .compatible = "samsung,exynos5250-dwusb3",
175 .data = &exynos5250_drvdata,
176 }, {
177 .compatible = "samsung,exynos5433-dwusb3",
178 .data = &exynos5433_drvdata,
179 }, {
180 .compatible = "samsung,exynos7-dwusb3",
181 .data = &exynos7_drvdata,
182 }, {
183 .compatible = "samsung,exynos850-dwusb3",
184 .data = &exynos850_drvdata,
185 }, {
186 }
187};
188MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
189
190#ifdef CONFIG_PM_SLEEP
191static int dwc3_exynos_suspend(struct device *dev)
192{
193 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
194 int i;
195
196 for (i = exynos->num_clks - 1; i >= 0; i--)
197 clk_disable_unprepare(exynos->clks[i]);
198
199 regulator_disable(exynos->vdd33);
200 regulator_disable(exynos->vdd10);
201
202 return 0;
203}
204
205static int dwc3_exynos_resume(struct device *dev)
206{
207 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
208 int i, ret;
209
210 ret = regulator_enable(exynos->vdd33);
211 if (ret) {
212 dev_err(dev, "Failed to enable VDD33 supply\n");
213 return ret;
214 }
215 ret = regulator_enable(exynos->vdd10);
216 if (ret) {
217 dev_err(dev, "Failed to enable VDD10 supply\n");
218 return ret;
219 }
220
221 for (i = 0; i < exynos->num_clks; i++) {
222 ret = clk_prepare_enable(exynos->clks[i]);
223 if (ret) {
224 while (i-- > 0)
225 clk_disable_unprepare(exynos->clks[i]);
226 return ret;
227 }
228 }
229
230 return 0;
231}
232
233static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
234 SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
235};
236
237#define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops)
238#else
239#define DEV_PM_OPS NULL
240#endif /* CONFIG_PM_SLEEP */
241
242static struct platform_driver dwc3_exynos_driver = {
243 .probe = dwc3_exynos_probe,
244 .remove_new = dwc3_exynos_remove,
245 .driver = {
246 .name = "exynos-dwc3",
247 .of_match_table = exynos_dwc3_match,
248 .pm = DEV_PM_OPS,
249 },
250};
251
252module_platform_driver(dwc3_exynos_driver);
253
254MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
255MODULE_LICENSE("GPL v2");
256MODULE_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");