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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/mfd/syscon.h>
33#include <linux/regmap.h>
34#include <linux/of_platform.h>
35
36#define USB2PHY_DISCON_BYP_LATCH (1 << 31)
37#define USB2PHY_ANA_CONFIG1 0x4c
38
39
40
41
42
43
44
45
46
47
48
49int omap_usb2_set_comparator(struct phy_companion *comparator)
50{
51 struct omap_usb *phy;
52 struct usb_phy *x = usb_get_phy(USB_PHY_TYPE_USB2);
53
54 if (IS_ERR(x))
55 return -ENODEV;
56
57 phy = phy_to_omapusb(x);
58 phy->comparator = comparator;
59 return 0;
60}
61EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);
62
63static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
64{
65 struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);
66
67 if (!phy->comparator)
68 return -ENODEV;
69
70 return phy->comparator->set_vbus(phy->comparator, enabled);
71}
72
73static int omap_usb_start_srp(struct usb_otg *otg)
74{
75 struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);
76
77 if (!phy->comparator)
78 return -ENODEV;
79
80 return phy->comparator->start_srp(phy->comparator);
81}
82
83static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
84{
85 otg->host = host;
86 if (!host)
87 otg->state = OTG_STATE_UNDEFINED;
88
89 return 0;
90}
91
92static int omap_usb_set_peripheral(struct usb_otg *otg,
93 struct usb_gadget *gadget)
94{
95 otg->gadget = gadget;
96 if (!gadget)
97 otg->state = OTG_STATE_UNDEFINED;
98
99 return 0;
100}
101
102static int omap_usb_phy_power(struct omap_usb *phy, int on)
103{
104 u32 val;
105 int ret;
106
107 if (!phy->syscon_phy_power) {
108 omap_control_phy_power(phy->control_dev, on);
109 return 0;
110 }
111
112 if (on)
113 val = phy->power_on;
114 else
115 val = phy->power_off;
116
117 ret = regmap_update_bits(phy->syscon_phy_power, phy->power_reg,
118 phy->mask, val);
119 return ret;
120}
121
122static int omap_usb_power_off(struct phy *x)
123{
124 struct omap_usb *phy = phy_get_drvdata(x);
125
126 return omap_usb_phy_power(phy, false);
127}
128
129static int omap_usb_power_on(struct phy *x)
130{
131 struct omap_usb *phy = phy_get_drvdata(x);
132
133 return omap_usb_phy_power(phy, true);
134}
135
136static int omap_usb2_disable_clocks(struct omap_usb *phy)
137{
138 clk_disable(phy->wkupclk);
139 if (!IS_ERR(phy->optclk))
140 clk_disable(phy->optclk);
141
142 return 0;
143}
144
145static int omap_usb2_enable_clocks(struct omap_usb *phy)
146{
147 int ret;
148
149 ret = clk_enable(phy->wkupclk);
150 if (ret < 0) {
151 dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
152 goto err0;
153 }
154
155 if (!IS_ERR(phy->optclk)) {
156 ret = clk_enable(phy->optclk);
157 if (ret < 0) {
158 dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
159 goto err1;
160 }
161 }
162
163 return 0;
164
165err1:
166 clk_disable(phy->wkupclk);
167
168err0:
169 return ret;
170}
171
172static int omap_usb_init(struct phy *x)
173{
174 struct omap_usb *phy = phy_get_drvdata(x);
175 u32 val;
176
177 omap_usb2_enable_clocks(phy);
178
179 if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
180
181
182
183
184
185
186
187
188 val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1);
189 val |= USB2PHY_DISCON_BYP_LATCH;
190 omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
191 }
192
193 return 0;
194}
195
196static int omap_usb_exit(struct phy *x)
197{
198 struct omap_usb *phy = phy_get_drvdata(x);
199
200 return omap_usb2_disable_clocks(phy);
201}
202
203static const struct phy_ops ops = {
204 .init = omap_usb_init,
205 .exit = omap_usb_exit,
206 .power_on = omap_usb_power_on,
207 .power_off = omap_usb_power_off,
208 .owner = THIS_MODULE,
209};
210
211static const struct usb_phy_data omap_usb2_data = {
212 .label = "omap_usb2",
213 .flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS,
214 .mask = OMAP_DEV_PHY_PD,
215 .power_off = OMAP_DEV_PHY_PD,
216};
217
218static const struct usb_phy_data omap5_usb2_data = {
219 .label = "omap5_usb2",
220 .flags = 0,
221 .mask = OMAP_DEV_PHY_PD,
222 .power_off = OMAP_DEV_PHY_PD,
223};
224
225static const struct usb_phy_data dra7x_usb2_data = {
226 .label = "dra7x_usb2",
227 .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
228 .mask = OMAP_DEV_PHY_PD,
229 .power_off = OMAP_DEV_PHY_PD,
230};
231
232static const struct usb_phy_data dra7x_usb2_phy2_data = {
233 .label = "dra7x_usb2_phy2",
234 .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
235 .mask = OMAP_USB2_PHY_PD,
236 .power_off = OMAP_USB2_PHY_PD,
237};
238
239static const struct usb_phy_data am437x_usb2_data = {
240 .label = "am437x_usb2",
241 .flags = 0,
242 .mask = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD |
243 AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
244 .power_on = AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
245 .power_off = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD,
246};
247
248static const struct of_device_id omap_usb2_id_table[] = {
249 {
250 .compatible = "ti,omap-usb2",
251 .data = &omap_usb2_data,
252 },
253 {
254 .compatible = "ti,omap5-usb2",
255 .data = &omap5_usb2_data,
256 },
257 {
258 .compatible = "ti,dra7x-usb2",
259 .data = &dra7x_usb2_data,
260 },
261 {
262 .compatible = "ti,dra7x-usb2-phy2",
263 .data = &dra7x_usb2_phy2_data,
264 },
265 {
266 .compatible = "ti,am437x-usb2",
267 .data = &am437x_usb2_data,
268 },
269 {},
270};
271MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
272
273static int omap_usb2_probe(struct platform_device *pdev)
274{
275 struct omap_usb *phy;
276 struct phy *generic_phy;
277 struct resource *res;
278 struct phy_provider *phy_provider;
279 struct usb_otg *otg;
280 struct device_node *node = pdev->dev.of_node;
281 struct device_node *control_node;
282 struct platform_device *control_pdev;
283 const struct of_device_id *of_id;
284 struct usb_phy_data *phy_data;
285
286 of_id = of_match_device(omap_usb2_id_table, &pdev->dev);
287
288 if (!of_id)
289 return -EINVAL;
290
291 phy_data = (struct usb_phy_data *)of_id->data;
292
293 phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
294 if (!phy)
295 return -ENOMEM;
296
297 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
298 if (!otg)
299 return -ENOMEM;
300
301 phy->dev = &pdev->dev;
302
303 phy->phy.dev = phy->dev;
304 phy->phy.label = phy_data->label;
305 phy->phy.otg = otg;
306 phy->phy.type = USB_PHY_TYPE_USB2;
307 phy->mask = phy_data->mask;
308 phy->power_on = phy_data->power_on;
309 phy->power_off = phy_data->power_off;
310
311 if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
312 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
313 phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
314 if (IS_ERR(phy->phy_base))
315 return PTR_ERR(phy->phy_base);
316 phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
317 }
318
319 phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node,
320 "syscon-phy-power");
321 if (IS_ERR(phy->syscon_phy_power)) {
322 dev_dbg(&pdev->dev,
323 "can't get syscon-phy-power, using control device\n");
324 phy->syscon_phy_power = NULL;
325
326 control_node = of_parse_phandle(node, "ctrl-module", 0);
327 if (!control_node) {
328 dev_err(&pdev->dev,
329 "Failed to get control device phandle\n");
330 return -EINVAL;
331 }
332
333 control_pdev = of_find_device_by_node(control_node);
334 if (!control_pdev) {
335 dev_err(&pdev->dev, "Failed to get control device\n");
336 return -EINVAL;
337 }
338 phy->control_dev = &control_pdev->dev;
339 } else {
340 if (of_property_read_u32_index(node,
341 "syscon-phy-power", 1,
342 &phy->power_reg)) {
343 dev_err(&pdev->dev,
344 "couldn't get power reg. offset\n");
345 return -EINVAL;
346 }
347 }
348
349 otg->set_host = omap_usb_set_host;
350 otg->set_peripheral = omap_usb_set_peripheral;
351 if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS)
352 otg->set_vbus = omap_usb_set_vbus;
353 if (phy_data->flags & OMAP_USB2_HAS_START_SRP)
354 otg->start_srp = omap_usb_start_srp;
355 otg->usb_phy = &phy->phy;
356
357 platform_set_drvdata(pdev, phy);
358 pm_runtime_enable(phy->dev);
359
360 generic_phy = devm_phy_create(phy->dev, NULL, &ops);
361 if (IS_ERR(generic_phy)) {
362 pm_runtime_disable(phy->dev);
363 return PTR_ERR(generic_phy);
364 }
365
366 phy_set_drvdata(generic_phy, phy);
367 omap_usb_power_off(generic_phy);
368
369 phy_provider = devm_of_phy_provider_register(phy->dev,
370 of_phy_simple_xlate);
371 if (IS_ERR(phy_provider)) {
372 pm_runtime_disable(phy->dev);
373 return PTR_ERR(phy_provider);
374 }
375
376 phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
377 if (IS_ERR(phy->wkupclk)) {
378 dev_warn(&pdev->dev, "unable to get wkupclk, trying old name\n");
379 phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
380 if (IS_ERR(phy->wkupclk)) {
381 dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
382 pm_runtime_disable(phy->dev);
383 return PTR_ERR(phy->wkupclk);
384 } else {
385 dev_warn(&pdev->dev,
386 "found usb_phy_cm_clk32k, please fix DTS\n");
387 }
388 }
389 clk_prepare(phy->wkupclk);
390
391 phy->optclk = devm_clk_get(phy->dev, "refclk");
392 if (IS_ERR(phy->optclk)) {
393 dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n");
394 phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
395 if (IS_ERR(phy->optclk)) {
396 dev_dbg(&pdev->dev,
397 "unable to get usb_otg_ss_refclk960m\n");
398 } else {
399 dev_warn(&pdev->dev,
400 "found usb_otg_ss_refclk960m, please fix DTS\n");
401 }
402 }
403
404 if (!IS_ERR(phy->optclk))
405 clk_prepare(phy->optclk);
406
407 usb_add_phy_dev(&phy->phy);
408
409 return 0;
410}
411
412static int omap_usb2_remove(struct platform_device *pdev)
413{
414 struct omap_usb *phy = platform_get_drvdata(pdev);
415
416 clk_unprepare(phy->wkupclk);
417 if (!IS_ERR(phy->optclk))
418 clk_unprepare(phy->optclk);
419 usb_remove_phy(&phy->phy);
420 pm_runtime_disable(phy->dev);
421
422 return 0;
423}
424
425static struct platform_driver omap_usb2_driver = {
426 .probe = omap_usb2_probe,
427 .remove = omap_usb2_remove,
428 .driver = {
429 .name = "omap-usb2",
430 .of_match_table = omap_usb2_id_table,
431 },
432};
433
434module_platform_driver(omap_usb2_driver);
435
436MODULE_ALIAS("platform:omap_usb2");
437MODULE_AUTHOR("Texas Instruments Inc.");
438MODULE_DESCRIPTION("OMAP USB2 phy driver");
439MODULE_LICENSE("GPL v2");
440
