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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/platform_data/dwc3-exynos.h>
24#include <linux/dma-mapping.h>
25#include <linux/clk.h>
26#include <linux/usb/otg.h>
27#include <linux/usb/usb_phy_gen_xceiv.h>
28#include <linux/of.h>
29#include <linux/of_platform.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};
38
39static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
40{
41 struct usb_phy_gen_xceiv_platform_data pdata;
42 struct platform_device *pdev;
43 int ret;
44
45 memset(&pdata, 0x00, sizeof(pdata));
46
47 pdev = platform_device_alloc("usb_phy_gen_xceiv", PLATFORM_DEVID_AUTO);
48 if (!pdev)
49 return -ENOMEM;
50
51 exynos->usb2_phy = pdev;
52 pdata.type = USB_PHY_TYPE_USB2;
53 pdata.gpio_reset = -1;
54
55 ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
56 if (ret)
57 goto err1;
58
59 pdev = platform_device_alloc("usb_phy_gen_xceiv", PLATFORM_DEVID_AUTO);
60 if (!pdev) {
61 ret = -ENOMEM;
62 goto err1;
63 }
64
65 exynos->usb3_phy = pdev;
66 pdata.type = USB_PHY_TYPE_USB3;
67
68 ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
69 if (ret)
70 goto err2;
71
72 ret = platform_device_add(exynos->usb2_phy);
73 if (ret)
74 goto err2;
75
76 ret = platform_device_add(exynos->usb3_phy);
77 if (ret)
78 goto err3;
79
80 return 0;
81
82err3:
83 platform_device_del(exynos->usb2_phy);
84
85err2:
86 platform_device_put(exynos->usb3_phy);
87
88err1:
89 platform_device_put(exynos->usb2_phy);
90
91 return ret;
92}
93
94static int dwc3_exynos_remove_child(struct device *dev, void *unused)
95{
96 struct platform_device *pdev = to_platform_device(dev);
97
98 platform_device_unregister(pdev);
99
100 return 0;
101}
102
103static int dwc3_exynos_probe(struct platform_device *pdev)
104{
105 struct dwc3_exynos *exynos;
106 struct clk *clk;
107 struct device *dev = &pdev->dev;
108 struct device_node *node = dev->of_node;
109
110 int ret = -ENOMEM;
111
112 exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
113 if (!exynos) {
114 dev_err(dev, "not enough memory\n");
115 goto err1;
116 }
117
118 /*
119 * Right now device-tree probed devices don't get dma_mask set.
120 * Since shared usb code relies on it, set it here for now.
121 * Once we move to full device tree support this will vanish off.
122 */
123 ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
124 if (ret)
125 goto err1;
126
127 platform_set_drvdata(pdev, exynos);
128
129 ret = dwc3_exynos_register_phys(exynos);
130 if (ret) {
131 dev_err(dev, "couldn't register PHYs\n");
132 goto err1;
133 }
134
135 clk = devm_clk_get(dev, "usbdrd30");
136 if (IS_ERR(clk)) {
137 dev_err(dev, "couldn't get clock\n");
138 ret = -EINVAL;
139 goto err1;
140 }
141
142 exynos->dev = dev;
143 exynos->clk = clk;
144
145 clk_prepare_enable(exynos->clk);
146
147 if (node) {
148 ret = of_platform_populate(node, NULL, NULL, dev);
149 if (ret) {
150 dev_err(dev, "failed to add dwc3 core\n");
151 goto err2;
152 }
153 } else {
154 dev_err(dev, "no device node, failed to add dwc3 core\n");
155 ret = -ENODEV;
156 goto err2;
157 }
158
159 return 0;
160
161err2:
162 clk_disable_unprepare(clk);
163err1:
164 return ret;
165}
166
167static int dwc3_exynos_remove(struct platform_device *pdev)
168{
169 struct dwc3_exynos *exynos = platform_get_drvdata(pdev);
170
171 device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
172 platform_device_unregister(exynos->usb2_phy);
173 platform_device_unregister(exynos->usb3_phy);
174
175 clk_disable_unprepare(exynos->clk);
176
177 return 0;
178}
179
180#ifdef CONFIG_OF
181static const struct of_device_id exynos_dwc3_match[] = {
182 { .compatible = "samsung,exynos5250-dwusb3" },
183 {},
184};
185MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
186#endif
187
188#ifdef CONFIG_PM_SLEEP
189static int dwc3_exynos_suspend(struct device *dev)
190{
191 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
192
193 clk_disable(exynos->clk);
194
195 return 0;
196}
197
198static int dwc3_exynos_resume(struct device *dev)
199{
200 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
201
202 clk_enable(exynos->clk);
203
204 /* runtime set active to reflect active state. */
205 pm_runtime_disable(dev);
206 pm_runtime_set_active(dev);
207 pm_runtime_enable(dev);
208
209 return 0;
210}
211
212static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
213 SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
214};
215
216#define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops)
217#else
218#define DEV_PM_OPS NULL
219#endif /* CONFIG_PM_SLEEP */
220
221static struct platform_driver dwc3_exynos_driver = {
222 .probe = dwc3_exynos_probe,
223 .remove = dwc3_exynos_remove,
224 .driver = {
225 .name = "exynos-dwc3",
226 .of_match_table = of_match_ptr(exynos_dwc3_match),
227 .pm = DEV_PM_OPS,
228 },
229};
230
231module_platform_driver(dwc3_exynos_driver);
232
233MODULE_ALIAS("platform:exynos-dwc3");
234MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
235MODULE_LICENSE("GPL v2");
236MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");