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Linux/drivers/phy/phy-omap-usb2.c

  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  */
 49 int 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 }
 61 EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);
 62 
 63 static 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 
 73 static 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 
 83 static 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 
 92 static 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 
102 static 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 
122 static 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 
129 static 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 
136 static 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 
158 static 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 
165 static 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 
172 static 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 
179 static 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 
186 static 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 
193 static 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 
202 static 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 };
225 MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
226 
227 static 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 
366 static 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 
381 static 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 
393 static 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 
415 err1:
416         clk_disable(phy->wkupclk);
417 
418 err0:
419         return ret;
420 }
421 
422 static 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 
432 static 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 
442 module_platform_driver(omap_usb2_driver);
443 
444 MODULE_ALIAS("platform:omap_usb2");
445 MODULE_AUTHOR("Texas Instruments Inc.");
446 MODULE_DESCRIPTION("OMAP USB2 phy driver");
447 MODULE_LICENSE("GPL v2");
448 

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