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19#include <linux/module.h>
20#include <linux/platform_device.h>
21#include <linux/slab.h>
22#include <linux/of.h>
23#include <linux/io.h>
24#include <linux/phy/omap_usb.h>
25#include <linux/usb/phy_companion.h>
26#include <linux/clk.h>
27#include <linux/err.h>
28#include <linux/pm_runtime.h>
29#include <linux/delay.h>
30#include <linux/phy/omap_control_phy.h>
31#include <linux/phy/phy.h>
32#include <linux/of_platform.h>
33
34#define USB2PHY_DISCON_BYP_LATCH (1 << 31)
35#define USB2PHY_ANA_CONFIG1 0x4c
36
37
38
39
40
41
42
43
44
45
46
47int omap_usb2_set_comparator(struct phy_companion *comparator)
48{
49 struct omap_usb *phy;
50 struct usb_phy *x = usb_get_phy(USB_PHY_TYPE_USB2);
51
52 if (IS_ERR(x))
53 return -ENODEV;
54
55 phy = phy_to_omapusb(x);
56 phy->comparator = comparator;
57 return 0;
58}
59EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);
60
61static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
62{
63 struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);
64
65 if (!phy->comparator)
66 return -ENODEV;
67
68 return phy->comparator->set_vbus(phy->comparator, enabled);
69}
70
71static int omap_usb_start_srp(struct usb_otg *otg)
72{
73 struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);
74
75 if (!phy->comparator)
76 return -ENODEV;
77
78 return phy->comparator->start_srp(phy->comparator);
79}
80
81static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
82{
83 otg->host = host;
84 if (!host)
85 otg->state = OTG_STATE_UNDEFINED;
86
87 return 0;
88}
89
90static int omap_usb_set_peripheral(struct usb_otg *otg,
91 struct usb_gadget *gadget)
92{
93 otg->gadget = gadget;
94 if (!gadget)
95 otg->state = OTG_STATE_UNDEFINED;
96
97 return 0;
98}
99
100static int omap_usb_power_off(struct phy *x)
101{
102 struct omap_usb *phy = phy_get_drvdata(x);
103
104 omap_control_phy_power(phy->control_dev, 0);
105
106 return 0;
107}
108
109static int omap_usb_power_on(struct phy *x)
110{
111 struct omap_usb *phy = phy_get_drvdata(x);
112
113 omap_control_phy_power(phy->control_dev, 1);
114
115 return 0;
116}
117
118static int omap_usb_init(struct phy *x)
119{
120 struct omap_usb *phy = phy_get_drvdata(x);
121 u32 val;
122
123 if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
124
125
126
127
128
129
130
131
132 val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1);
133 val |= USB2PHY_DISCON_BYP_LATCH;
134 omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
135 }
136
137 return 0;
138}
139
140static struct phy_ops ops = {
141 .init = omap_usb_init,
142 .power_on = omap_usb_power_on,
143 .power_off = omap_usb_power_off,
144 .owner = THIS_MODULE,
145};
146
147static const struct usb_phy_data omap_usb2_data = {
148 .label = "omap_usb2",
149 .flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS,
150};
151
152static const struct usb_phy_data omap5_usb2_data = {
153 .label = "omap5_usb2",
154 .flags = 0,
155};
156
157static const struct usb_phy_data dra7x_usb2_data = {
158 .label = "dra7x_usb2",
159 .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
160};
161
162static const struct usb_phy_data am437x_usb2_data = {
163 .label = "am437x_usb2",
164 .flags = 0,
165};
166
167static const struct of_device_id omap_usb2_id_table[] = {
168 {
169 .compatible = "ti,omap-usb2",
170 .data = &omap_usb2_data,
171 },
172 {
173 .compatible = "ti,omap5-usb2",
174 .data = &omap5_usb2_data,
175 },
176 {
177 .compatible = "ti,dra7x-usb2",
178 .data = &dra7x_usb2_data,
179 },
180 {
181 .compatible = "ti,am437x-usb2",
182 .data = &am437x_usb2_data,
183 },
184 {},
185};
186MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
187
188static int omap_usb2_probe(struct platform_device *pdev)
189{
190 struct omap_usb *phy;
191 struct phy *generic_phy;
192 struct resource *res;
193 struct phy_provider *phy_provider;
194 struct usb_otg *otg;
195 struct device_node *node = pdev->dev.of_node;
196 struct device_node *control_node;
197 struct platform_device *control_pdev;
198 const struct of_device_id *of_id;
199 struct usb_phy_data *phy_data;
200
201 of_id = of_match_device(omap_usb2_id_table, &pdev->dev);
202
203 if (!of_id)
204 return -EINVAL;
205
206 phy_data = (struct usb_phy_data *)of_id->data;
207
208 phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
209 if (!phy)
210 return -ENOMEM;
211
212 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
213 if (!otg)
214 return -ENOMEM;
215
216 phy->dev = &pdev->dev;
217
218 phy->phy.dev = phy->dev;
219 phy->phy.label = phy_data->label;
220 phy->phy.otg = otg;
221 phy->phy.type = USB_PHY_TYPE_USB2;
222
223 if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
224 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
225 phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
226 if (IS_ERR(phy->phy_base))
227 return PTR_ERR(phy->phy_base);
228 phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
229 }
230
231 control_node = of_parse_phandle(node, "ctrl-module", 0);
232 if (!control_node) {
233 dev_err(&pdev->dev, "Failed to get control device phandle\n");
234 return -EINVAL;
235 }
236
237 control_pdev = of_find_device_by_node(control_node);
238 if (!control_pdev) {
239 dev_err(&pdev->dev, "Failed to get control device\n");
240 return -EINVAL;
241 }
242
243 phy->control_dev = &control_pdev->dev;
244 omap_control_phy_power(phy->control_dev, 0);
245
246 otg->set_host = omap_usb_set_host;
247 otg->set_peripheral = omap_usb_set_peripheral;
248 if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS)
249 otg->set_vbus = omap_usb_set_vbus;
250 if (phy_data->flags & OMAP_USB2_HAS_START_SRP)
251 otg->start_srp = omap_usb_start_srp;
252 otg->usb_phy = &phy->phy;
253
254 platform_set_drvdata(pdev, phy);
255 pm_runtime_enable(phy->dev);
256
257 generic_phy = devm_phy_create(phy->dev, NULL, &ops);
258 if (IS_ERR(generic_phy)) {
259 pm_runtime_disable(phy->dev);
260 return PTR_ERR(generic_phy);
261 }
262
263 phy_set_drvdata(generic_phy, phy);
264
265 phy_provider = devm_of_phy_provider_register(phy->dev,
266 of_phy_simple_xlate);
267 if (IS_ERR(phy_provider)) {
268 pm_runtime_disable(phy->dev);
269 return PTR_ERR(phy_provider);
270 }
271
272 phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
273 if (IS_ERR(phy->wkupclk)) {
274 dev_warn(&pdev->dev, "unable to get wkupclk, trying old name\n");
275 phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
276 if (IS_ERR(phy->wkupclk)) {
277 dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
278 pm_runtime_disable(phy->dev);
279 return PTR_ERR(phy->wkupclk);
280 } else {
281 dev_warn(&pdev->dev,
282 "found usb_phy_cm_clk32k, please fix DTS\n");
283 }
284 }
285 clk_prepare(phy->wkupclk);
286
287 phy->optclk = devm_clk_get(phy->dev, "refclk");
288 if (IS_ERR(phy->optclk)) {
289 dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n");
290 phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
291 if (IS_ERR(phy->optclk)) {
292 dev_dbg(&pdev->dev,
293 "unable to get usb_otg_ss_refclk960m\n");
294 } else {
295 dev_warn(&pdev->dev,
296 "found usb_otg_ss_refclk960m, please fix DTS\n");
297 }
298 }
299
300 if (!IS_ERR(phy->optclk))
301 clk_prepare(phy->optclk);
302
303 usb_add_phy_dev(&phy->phy);
304
305 return 0;
306}
307
308static int omap_usb2_remove(struct platform_device *pdev)
309{
310 struct omap_usb *phy = platform_get_drvdata(pdev);
311
312 clk_unprepare(phy->wkupclk);
313 if (!IS_ERR(phy->optclk))
314 clk_unprepare(phy->optclk);
315 usb_remove_phy(&phy->phy);
316 pm_runtime_disable(phy->dev);
317
318 return 0;
319}
320
321#ifdef CONFIG_PM
322
323static int omap_usb2_runtime_suspend(struct device *dev)
324{
325 struct platform_device *pdev = to_platform_device(dev);
326 struct omap_usb *phy = platform_get_drvdata(pdev);
327
328 clk_disable(phy->wkupclk);
329 if (!IS_ERR(phy->optclk))
330 clk_disable(phy->optclk);
331
332 return 0;
333}
334
335static int omap_usb2_runtime_resume(struct device *dev)
336{
337 struct platform_device *pdev = to_platform_device(dev);
338 struct omap_usb *phy = platform_get_drvdata(pdev);
339 int ret;
340
341 ret = clk_enable(phy->wkupclk);
342 if (ret < 0) {
343 dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
344 goto err0;
345 }
346
347 if (!IS_ERR(phy->optclk)) {
348 ret = clk_enable(phy->optclk);
349 if (ret < 0) {
350 dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
351 goto err1;
352 }
353 }
354
355 return 0;
356
357err1:
358 clk_disable(phy->wkupclk);
359
360err0:
361 return ret;
362}
363
364static const struct dev_pm_ops omap_usb2_pm_ops = {
365 SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
366 NULL)
367};
368
369#define DEV_PM_OPS (&omap_usb2_pm_ops)
370#else
371#define DEV_PM_OPS NULL
372#endif
373
374static struct platform_driver omap_usb2_driver = {
375 .probe = omap_usb2_probe,
376 .remove = omap_usb2_remove,
377 .driver = {
378 .name = "omap-usb2",
379 .pm = DEV_PM_OPS,
380 .of_match_table = omap_usb2_id_table,
381 },
382};
383
384module_platform_driver(omap_usb2_driver);
385
386MODULE_ALIAS("platform:omap_usb2");
387MODULE_AUTHOR("Texas Instruments Inc.");
388MODULE_DESCRIPTION("OMAP USB2 phy driver");
389MODULE_LICENSE("GPL v2");
390
