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1/*
2 * omap-usb2.c - USB PHY, talking to musb controller in OMAP.
3 *
4 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * Author: Kishon Vijay Abraham I <kishon@ti.com>
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 */
18
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 * omap_usb2_set_comparator - links the comparator present in the sytem with
41 * this phy
42 * @comparator - the companion phy(comparator) for this phy
43 *
44 * The phy companion driver should call this API passing the phy_companion
45 * filled with set_vbus and start_srp to be used by usb phy.
46 *
47 * For use by phy companion driver
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_usb_init(struct phy *x)
137{
138 struct omap_usb *phy = phy_get_drvdata(x);
139 u32 val;
140
141 if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
142 /*
143 *
144 * Reduce the sensitivity of internal PHY by enabling the
145 * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
146 * resolves issues with certain devices which can otherwise
147 * be prone to false disconnects.
148 *
149 */
150 val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1);
151 val |= USB2PHY_DISCON_BYP_LATCH;
152 omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
153 }
154
155 return 0;
156}
157
158static const struct phy_ops ops = {
159 .init = omap_usb_init,
160 .power_on = omap_usb_power_on,
161 .power_off = omap_usb_power_off,
162 .owner = THIS_MODULE,
163};
164
165static const struct usb_phy_data omap_usb2_data = {
166 .label = "omap_usb2",
167 .flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS,
168 .mask = OMAP_DEV_PHY_PD,
169 .power_off = OMAP_DEV_PHY_PD,
170};
171
172static const struct usb_phy_data omap5_usb2_data = {
173 .label = "omap5_usb2",
174 .flags = 0,
175 .mask = OMAP_DEV_PHY_PD,
176 .power_off = OMAP_DEV_PHY_PD,
177};
178
179static const struct usb_phy_data dra7x_usb2_data = {
180 .label = "dra7x_usb2",
181 .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
182 .mask = OMAP_DEV_PHY_PD,
183 .power_off = OMAP_DEV_PHY_PD,
184};
185
186static const struct usb_phy_data dra7x_usb2_phy2_data = {
187 .label = "dra7x_usb2_phy2",
188 .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
189 .mask = OMAP_USB2_PHY_PD,
190 .power_off = OMAP_USB2_PHY_PD,
191};
192
193static const struct usb_phy_data am437x_usb2_data = {
194 .label = "am437x_usb2",
195 .flags = 0,
196 .mask = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD |
197 AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
198 .power_on = AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
199 .power_off = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD,
200};
201
202static const struct of_device_id omap_usb2_id_table[] = {
203 {
204 .compatible = "ti,omap-usb2",
205 .data = &omap_usb2_data,
206 },
207 {
208 .compatible = "ti,omap5-usb2",
209 .data = &omap5_usb2_data,
210 },
211 {
212 .compatible = "ti,dra7x-usb2",
213 .data = &dra7x_usb2_data,
214 },
215 {
216 .compatible = "ti,dra7x-usb2-phy2",
217 .data = &dra7x_usb2_phy2_data,
218 },
219 {
220 .compatible = "ti,am437x-usb2",
221 .data = &am437x_usb2_data,
222 },
223 {},
224};
225MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
226
227static int omap_usb2_probe(struct platform_device *pdev)
228{
229 struct omap_usb *phy;
230 struct phy *generic_phy;
231 struct resource *res;
232 struct phy_provider *phy_provider;
233 struct usb_otg *otg;
234 struct device_node *node = pdev->dev.of_node;
235 struct device_node *control_node;
236 struct platform_device *control_pdev;
237 const struct of_device_id *of_id;
238 struct usb_phy_data *phy_data;
239
240 of_id = of_match_device(omap_usb2_id_table, &pdev->dev);
241
242 if (!of_id)
243 return -EINVAL;
244
245 phy_data = (struct usb_phy_data *)of_id->data;
246
247 phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
248 if (!phy)
249 return -ENOMEM;
250
251 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
252 if (!otg)
253 return -ENOMEM;
254
255 phy->dev = &pdev->dev;
256
257 phy->phy.dev = phy->dev;
258 phy->phy.label = phy_data->label;
259 phy->phy.otg = otg;
260 phy->phy.type = USB_PHY_TYPE_USB2;
261 phy->mask = phy_data->mask;
262 phy->power_on = phy_data->power_on;
263 phy->power_off = phy_data->power_off;
264
265 if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
266 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
267 phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
268 if (IS_ERR(phy->phy_base))
269 return PTR_ERR(phy->phy_base);
270 phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
271 }
272
273 phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node,
274 "syscon-phy-power");
275 if (IS_ERR(phy->syscon_phy_power)) {
276 dev_dbg(&pdev->dev,
277 "can't get syscon-phy-power, using control device\n");
278 phy->syscon_phy_power = NULL;
279
280 control_node = of_parse_phandle(node, "ctrl-module", 0);
281 if (!control_node) {
282 dev_err(&pdev->dev,
283 "Failed to get control device phandle\n");
284 return -EINVAL;
285 }
286
287 control_pdev = of_find_device_by_node(control_node);
288 if (!control_pdev) {
289 dev_err(&pdev->dev, "Failed to get control device\n");
290 return -EINVAL;
291 }
292 phy->control_dev = &control_pdev->dev;
293 } else {
294 if (of_property_read_u32_index(node,
295 "syscon-phy-power", 1,
296 &phy->power_reg)) {
297 dev_err(&pdev->dev,
298 "couldn't get power reg. offset\n");
299 return -EINVAL;
300 }
301 }
302
303 otg->set_host = omap_usb_set_host;
304 otg->set_peripheral = omap_usb_set_peripheral;
305 if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS)
306 otg->set_vbus = omap_usb_set_vbus;
307 if (phy_data->flags & OMAP_USB2_HAS_START_SRP)
308 otg->start_srp = omap_usb_start_srp;
309 otg->usb_phy = &phy->phy;
310
311 platform_set_drvdata(pdev, phy);
312 pm_runtime_enable(phy->dev);
313
314 generic_phy = devm_phy_create(phy->dev, NULL, &ops);
315 if (IS_ERR(generic_phy)) {
316 pm_runtime_disable(phy->dev);
317 return PTR_ERR(generic_phy);
318 }
319
320 phy_set_drvdata(generic_phy, phy);
321 omap_usb_power_off(generic_phy);
322
323 phy_provider = devm_of_phy_provider_register(phy->dev,
324 of_phy_simple_xlate);
325 if (IS_ERR(phy_provider)) {
326 pm_runtime_disable(phy->dev);
327 return PTR_ERR(phy_provider);
328 }
329
330 phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
331 if (IS_ERR(phy->wkupclk)) {
332 dev_warn(&pdev->dev, "unable to get wkupclk, trying old name\n");
333 phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
334 if (IS_ERR(phy->wkupclk)) {
335 dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
336 pm_runtime_disable(phy->dev);
337 return PTR_ERR(phy->wkupclk);
338 } else {
339 dev_warn(&pdev->dev,
340 "found usb_phy_cm_clk32k, please fix DTS\n");
341 }
342 }
343 clk_prepare(phy->wkupclk);
344
345 phy->optclk = devm_clk_get(phy->dev, "refclk");
346 if (IS_ERR(phy->optclk)) {
347 dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n");
348 phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
349 if (IS_ERR(phy->optclk)) {
350 dev_dbg(&pdev->dev,
351 "unable to get usb_otg_ss_refclk960m\n");
352 } else {
353 dev_warn(&pdev->dev,
354 "found usb_otg_ss_refclk960m, please fix DTS\n");
355 }
356 }
357
358 if (!IS_ERR(phy->optclk))
359 clk_prepare(phy->optclk);
360
361 usb_add_phy_dev(&phy->phy);
362
363 return 0;
364}
365
366static int omap_usb2_remove(struct platform_device *pdev)
367{
368 struct omap_usb *phy = platform_get_drvdata(pdev);
369
370 clk_unprepare(phy->wkupclk);
371 if (!IS_ERR(phy->optclk))
372 clk_unprepare(phy->optclk);
373 usb_remove_phy(&phy->phy);
374 pm_runtime_disable(phy->dev);
375
376 return 0;
377}
378
379#ifdef CONFIG_PM
380
381static int omap_usb2_runtime_suspend(struct device *dev)
382{
383 struct platform_device *pdev = to_platform_device(dev);
384 struct omap_usb *phy = platform_get_drvdata(pdev);
385
386 clk_disable(phy->wkupclk);
387 if (!IS_ERR(phy->optclk))
388 clk_disable(phy->optclk);
389
390 return 0;
391}
392
393static int omap_usb2_runtime_resume(struct device *dev)
394{
395 struct platform_device *pdev = to_platform_device(dev);
396 struct omap_usb *phy = platform_get_drvdata(pdev);
397 int ret;
398
399 ret = clk_enable(phy->wkupclk);
400 if (ret < 0) {
401 dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
402 goto err0;
403 }
404
405 if (!IS_ERR(phy->optclk)) {
406 ret = clk_enable(phy->optclk);
407 if (ret < 0) {
408 dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
409 goto err1;
410 }
411 }
412
413 return 0;
414
415err1:
416 clk_disable(phy->wkupclk);
417
418err0:
419 return ret;
420}
421
422static const struct dev_pm_ops omap_usb2_pm_ops = {
423 SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
424 NULL)
425};
426
427#define DEV_PM_OPS (&omap_usb2_pm_ops)
428#else
429#define DEV_PM_OPS NULL
430#endif
431
432static struct platform_driver omap_usb2_driver = {
433 .probe = omap_usb2_probe,
434 .remove = omap_usb2_remove,
435 .driver = {
436 .name = "omap-usb2",
437 .pm = DEV_PM_OPS,
438 .of_match_table = omap_usb2_id_table,
439 },
440};
441
442module_platform_driver(omap_usb2_driver);
443
444MODULE_ALIAS("platform:omap_usb2");
445MODULE_AUTHOR("Texas Instruments Inc.");
446MODULE_DESCRIPTION("OMAP USB2 phy driver");
447MODULE_LICENSE("GPL v2");