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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
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");
259
