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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/dma-mapping.h>
24#include <linux/clk.h>
25#include <linux/usb/otg.h>
26#include <linux/usb/usb_phy_generic.h>
27#include <linux/of.h>
28#include <linux/of_platform.h>
29#include <linux/regulator/consumer.h>
30
31struct dwc3_exynos {
32 struct platform_device *usb2_phy;
33 struct platform_device *usb3_phy;
34 struct device *dev;
35
36 struct clk *clk;
37 struct clk *susp_clk;
38 struct clk *axius_clk;
39
40 struct regulator *vdd33;
41 struct regulator *vdd10;
42};
43
44static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
45{
46 struct usb_phy_generic_platform_data pdata;
47 struct platform_device *pdev;
48 int ret;
49
50 memset(&pdata, 0x00, sizeof(pdata));
51
52 pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
53 if (!pdev)
54 return -ENOMEM;
55
56 exynos->usb2_phy = pdev;
57 pdata.type = USB_PHY_TYPE_USB2;
58 pdata.gpio_reset = -1;
59
60 ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
61 if (ret)
62 goto err1;
63
64 pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
65 if (!pdev) {
66 ret = -ENOMEM;
67 goto err1;
68 }
69
70 exynos->usb3_phy = pdev;
71 pdata.type = USB_PHY_TYPE_USB3;
72
73 ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
74 if (ret)
75 goto err2;
76
77 ret = platform_device_add(exynos->usb2_phy);
78 if (ret)
79 goto err2;
80
81 ret = platform_device_add(exynos->usb3_phy);
82 if (ret)
83 goto err3;
84
85 return 0;
86
87err3:
88 platform_device_del(exynos->usb2_phy);
89
90err2:
91 platform_device_put(exynos->usb3_phy);
92
93err1:
94 platform_device_put(exynos->usb2_phy);
95
96 return ret;
97}
98
99static int dwc3_exynos_remove_child(struct device *dev, void *unused)
100{
101 struct platform_device *pdev = to_platform_device(dev);
102
103 platform_device_unregister(pdev);
104
105 return 0;
106}
107
108static int dwc3_exynos_probe(struct platform_device *pdev)
109{
110 struct dwc3_exynos *exynos;
111 struct device *dev = &pdev->dev;
112 struct device_node *node = dev->of_node;
113
114 int ret;
115
116 exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
117 if (!exynos)
118 return -ENOMEM;
119
120 /*
121 * Right now device-tree probed devices don't get dma_mask set.
122 * Since shared usb code relies on it, set it here for now.
123 * Once we move to full device tree support this will vanish off.
124 */
125 ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
126 if (ret)
127 return ret;
128
129 platform_set_drvdata(pdev, exynos);
130
131 ret = dwc3_exynos_register_phys(exynos);
132 if (ret) {
133 dev_err(dev, "couldn't register PHYs\n");
134 return ret;
135 }
136
137 exynos->dev = dev;
138
139 exynos->clk = devm_clk_get(dev, "usbdrd30");
140 if (IS_ERR(exynos->clk)) {
141 dev_err(dev, "couldn't get clock\n");
142 return -EINVAL;
143 }
144 clk_prepare_enable(exynos->clk);
145
146 exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
147 if (IS_ERR(exynos->susp_clk)) {
148 dev_info(dev, "no suspend clk specified\n");
149 exynos->susp_clk = NULL;
150 }
151 clk_prepare_enable(exynos->susp_clk);
152
153 if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
154 exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
155 if (IS_ERR(exynos->axius_clk)) {
156 dev_err(dev, "no AXI UpScaler clk specified\n");
157 return -ENODEV;
158 }
159 clk_prepare_enable(exynos->axius_clk);
160 } else {
161 exynos->axius_clk = NULL;
162 }
163
164 exynos->vdd33 = devm_regulator_get(dev, "vdd33");
165 if (IS_ERR(exynos->vdd33)) {
166 ret = PTR_ERR(exynos->vdd33);
167 goto err2;
168 }
169 ret = regulator_enable(exynos->vdd33);
170 if (ret) {
171 dev_err(dev, "Failed to enable VDD33 supply\n");
172 goto err2;
173 }
174
175 exynos->vdd10 = devm_regulator_get(dev, "vdd10");
176 if (IS_ERR(exynos->vdd10)) {
177 ret = PTR_ERR(exynos->vdd10);
178 goto err3;
179 }
180 ret = regulator_enable(exynos->vdd10);
181 if (ret) {
182 dev_err(dev, "Failed to enable VDD10 supply\n");
183 goto err3;
184 }
185
186 if (node) {
187 ret = of_platform_populate(node, NULL, NULL, dev);
188 if (ret) {
189 dev_err(dev, "failed to add dwc3 core\n");
190 goto err4;
191 }
192 } else {
193 dev_err(dev, "no device node, failed to add dwc3 core\n");
194 ret = -ENODEV;
195 goto err4;
196 }
197
198 return 0;
199
200err4:
201 regulator_disable(exynos->vdd10);
202err3:
203 regulator_disable(exynos->vdd33);
204err2:
205 clk_disable_unprepare(exynos->axius_clk);
206 clk_disable_unprepare(exynos->susp_clk);
207 clk_disable_unprepare(exynos->clk);
208 return ret;
209}
210
211static int dwc3_exynos_remove(struct platform_device *pdev)
212{
213 struct dwc3_exynos *exynos = platform_get_drvdata(pdev);
214
215 device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
216 platform_device_unregister(exynos->usb2_phy);
217 platform_device_unregister(exynos->usb3_phy);
218
219 clk_disable_unprepare(exynos->axius_clk);
220 clk_disable_unprepare(exynos->susp_clk);
221 clk_disable_unprepare(exynos->clk);
222
223 regulator_disable(exynos->vdd33);
224 regulator_disable(exynos->vdd10);
225
226 return 0;
227}
228
229static const struct of_device_id exynos_dwc3_match[] = {
230 { .compatible = "samsung,exynos5250-dwusb3" },
231 { .compatible = "samsung,exynos7-dwusb3" },
232 {},
233};
234MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
235
236#ifdef CONFIG_PM_SLEEP
237static int dwc3_exynos_suspend(struct device *dev)
238{
239 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
240
241 clk_disable(exynos->axius_clk);
242 clk_disable(exynos->clk);
243
244 regulator_disable(exynos->vdd33);
245 regulator_disable(exynos->vdd10);
246
247 return 0;
248}
249
250static int dwc3_exynos_resume(struct device *dev)
251{
252 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
253 int ret;
254
255 ret = regulator_enable(exynos->vdd33);
256 if (ret) {
257 dev_err(dev, "Failed to enable VDD33 supply\n");
258 return ret;
259 }
260 ret = regulator_enable(exynos->vdd10);
261 if (ret) {
262 dev_err(dev, "Failed to enable VDD10 supply\n");
263 return ret;
264 }
265
266 clk_enable(exynos->clk);
267 clk_enable(exynos->axius_clk);
268
269 /* runtime set active to reflect active state. */
270 pm_runtime_disable(dev);
271 pm_runtime_set_active(dev);
272 pm_runtime_enable(dev);
273
274 return 0;
275}
276
277static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
278 SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
279};
280
281#define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops)
282#else
283#define DEV_PM_OPS NULL
284#endif /* CONFIG_PM_SLEEP */
285
286static struct platform_driver dwc3_exynos_driver = {
287 .probe = dwc3_exynos_probe,
288 .remove = dwc3_exynos_remove,
289 .driver = {
290 .name = "exynos-dwc3",
291 .of_match_table = exynos_dwc3_match,
292 .pm = DEV_PM_OPS,
293 },
294};
295
296module_platform_driver(dwc3_exynos_driver);
297
298MODULE_ALIAS("platform:exynos-dwc3");
299MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
300MODULE_LICENSE("GPL v2");
301MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");
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");