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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/of_platform.h>
 33 
 34 #define USB2PHY_DISCON_BYP_LATCH (1 << 31)
 35 #define USB2PHY_ANA_CONFIG1 0x4c
 36 
 37 /**
 38  * omap_usb2_set_comparator - links the comparator present in the sytem with
 39  *      this phy
 40  * @comparator - the companion phy(comparator) for this phy
 41  *
 42  * The phy companion driver should call this API passing the phy_companion
 43  * filled with set_vbus and start_srp to be used by usb phy.
 44  *
 45  * For use by phy companion driver
 46  */
 47 int 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 }
 59 EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);
 60 
 61 static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
 62 {
 63         struct omap_usb *phy = phy_to_omapusb(otg->phy);
 64 
 65         if (!phy->comparator)
 66                 return -ENODEV;
 67 
 68         return phy->comparator->set_vbus(phy->comparator, enabled);
 69 }
 70 
 71 static int omap_usb_start_srp(struct usb_otg *otg)
 72 {
 73         struct omap_usb *phy = phy_to_omapusb(otg->phy);
 74 
 75         if (!phy->comparator)
 76                 return -ENODEV;
 77 
 78         return phy->comparator->start_srp(phy->comparator);
 79 }
 80 
 81 static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
 82 {
 83         struct usb_phy  *phy = otg->phy;
 84 
 85         otg->host = host;
 86         if (!host)
 87                 phy->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         struct usb_phy  *phy = otg->phy;
 96 
 97         otg->gadget = gadget;
 98         if (!gadget)
 99                 phy->state = OTG_STATE_UNDEFINED;
100 
101         return 0;
102 }
103 
104 static int omap_usb_power_off(struct phy *x)
105 {
106         struct omap_usb *phy = phy_get_drvdata(x);
107 
108         omap_control_phy_power(phy->control_dev, 0);
109 
110         return 0;
111 }
112 
113 static int omap_usb_power_on(struct phy *x)
114 {
115         struct omap_usb *phy = phy_get_drvdata(x);
116 
117         omap_control_phy_power(phy->control_dev, 1);
118 
119         return 0;
120 }
121 
122 static int omap_usb_init(struct phy *x)
123 {
124         struct omap_usb *phy = phy_get_drvdata(x);
125         u32 val;
126 
127         if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
128                 /*
129                  *
130                  * Reduce the sensitivity of internal PHY by enabling the
131                  * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
132                  * resolves issues with certain devices which can otherwise
133                  * be prone to false disconnects.
134                  *
135                  */
136                 val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1);
137                 val |= USB2PHY_DISCON_BYP_LATCH;
138                 omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
139         }
140 
141         return 0;
142 }
143 
144 static struct phy_ops ops = {
145         .init           = omap_usb_init,
146         .power_on       = omap_usb_power_on,
147         .power_off      = omap_usb_power_off,
148         .owner          = THIS_MODULE,
149 };
150 
151 #ifdef CONFIG_OF
152 static const struct usb_phy_data omap_usb2_data = {
153         .label = "omap_usb2",
154         .flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS,
155 };
156 
157 static const struct usb_phy_data omap5_usb2_data = {
158         .label = "omap5_usb2",
159         .flags = 0,
160 };
161 
162 static const struct usb_phy_data dra7x_usb2_data = {
163         .label = "dra7x_usb2",
164         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
165 };
166 
167 static const struct usb_phy_data am437x_usb2_data = {
168         .label = "am437x_usb2",
169         .flags =  0,
170 };
171 
172 static const struct of_device_id omap_usb2_id_table[] = {
173         {
174                 .compatible = "ti,omap-usb2",
175                 .data = &omap_usb2_data,
176         },
177         {
178                 .compatible = "ti,omap5-usb2",
179                 .data = &omap5_usb2_data,
180         },
181         {
182                 .compatible = "ti,dra7x-usb2",
183                 .data = &dra7x_usb2_data,
184         },
185         {
186                 .compatible = "ti,am437x-usb2",
187                 .data = &am437x_usb2_data,
188         },
189         {},
190 };
191 MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
192 #endif
193 
194 static int omap_usb2_probe(struct platform_device *pdev)
195 {
196         struct omap_usb *phy;
197         struct phy *generic_phy;
198         struct resource *res;
199         struct phy_provider *phy_provider;
200         struct usb_otg *otg;
201         struct device_node *node = pdev->dev.of_node;
202         struct device_node *control_node;
203         struct platform_device *control_pdev;
204         const struct of_device_id *of_id;
205         struct usb_phy_data *phy_data;
206 
207         of_id = of_match_device(of_match_ptr(omap_usb2_id_table), &pdev->dev);
208 
209         if (!of_id)
210                 return -EINVAL;
211 
212         phy_data = (struct usb_phy_data *)of_id->data;
213 
214         phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
215         if (!phy) {
216                 dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n");
217                 return -ENOMEM;
218         }
219 
220         otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
221         if (!otg) {
222                 dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
223                 return -ENOMEM;
224         }
225 
226         phy->dev                = &pdev->dev;
227 
228         phy->phy.dev            = phy->dev;
229         phy->phy.label          = phy_data->label;
230         phy->phy.otg            = otg;
231         phy->phy.type           = USB_PHY_TYPE_USB2;
232 
233         if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
234                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
235                 phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
236                 if (IS_ERR(phy->phy_base))
237                         return PTR_ERR(phy->phy_base);
238                 phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
239         }
240 
241         control_node = of_parse_phandle(node, "ctrl-module", 0);
242         if (!control_node) {
243                 dev_err(&pdev->dev, "Failed to get control device phandle\n");
244                 return -EINVAL;
245         }
246 
247         control_pdev = of_find_device_by_node(control_node);
248         if (!control_pdev) {
249                 dev_err(&pdev->dev, "Failed to get control device\n");
250                 return -EINVAL;
251         }
252 
253         phy->control_dev = &control_pdev->dev;
254         omap_control_phy_power(phy->control_dev, 0);
255 
256         otg->set_host           = omap_usb_set_host;
257         otg->set_peripheral     = omap_usb_set_peripheral;
258         if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS)
259                 otg->set_vbus           = omap_usb_set_vbus;
260         if (phy_data->flags & OMAP_USB2_HAS_START_SRP)
261                 otg->start_srp          = omap_usb_start_srp;
262         otg->phy                = &phy->phy;
263 
264         platform_set_drvdata(pdev, phy);
265 
266         generic_phy = devm_phy_create(phy->dev, NULL, &ops, NULL);
267         if (IS_ERR(generic_phy))
268                 return PTR_ERR(generic_phy);
269 
270         phy_set_drvdata(generic_phy, phy);
271 
272         pm_runtime_enable(phy->dev);
273         phy_provider = devm_of_phy_provider_register(phy->dev,
274                         of_phy_simple_xlate);
275         if (IS_ERR(phy_provider)) {
276                 pm_runtime_disable(phy->dev);
277                 return PTR_ERR(phy_provider);
278         }
279 
280         phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
281         if (IS_ERR(phy->wkupclk)) {
282                 dev_warn(&pdev->dev, "unable to get wkupclk, trying old name\n");
283                 phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
284                 if (IS_ERR(phy->wkupclk)) {
285                         dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
286                         return PTR_ERR(phy->wkupclk);
287                 } else {
288                         dev_warn(&pdev->dev,
289                                  "found usb_phy_cm_clk32k, please fix DTS\n");
290                 }
291         }
292         clk_prepare(phy->wkupclk);
293 
294         phy->optclk = devm_clk_get(phy->dev, "refclk");
295         if (IS_ERR(phy->optclk)) {
296                 dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n");
297                 phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
298                 if (IS_ERR(phy->optclk)) {
299                         dev_dbg(&pdev->dev,
300                                 "unable to get usb_otg_ss_refclk960m\n");
301                 } else {
302                         dev_warn(&pdev->dev,
303                                  "found usb_otg_ss_refclk960m, please fix DTS\n");
304                 }
305         } else {
306                 clk_prepare(phy->optclk);
307         }
308 
309         usb_add_phy_dev(&phy->phy);
310 
311         return 0;
312 }
313 
314 static int omap_usb2_remove(struct platform_device *pdev)
315 {
316         struct omap_usb *phy = platform_get_drvdata(pdev);
317 
318         clk_unprepare(phy->wkupclk);
319         if (!IS_ERR(phy->optclk))
320                 clk_unprepare(phy->optclk);
321         usb_remove_phy(&phy->phy);
322         pm_runtime_disable(phy->dev);
323 
324         return 0;
325 }
326 
327 #ifdef CONFIG_PM_RUNTIME
328 
329 static int omap_usb2_runtime_suspend(struct device *dev)
330 {
331         struct platform_device  *pdev = to_platform_device(dev);
332         struct omap_usb *phy = platform_get_drvdata(pdev);
333 
334         clk_disable(phy->wkupclk);
335         if (!IS_ERR(phy->optclk))
336                 clk_disable(phy->optclk);
337 
338         return 0;
339 }
340 
341 static int omap_usb2_runtime_resume(struct device *dev)
342 {
343         struct platform_device  *pdev = to_platform_device(dev);
344         struct omap_usb *phy = platform_get_drvdata(pdev);
345         int ret;
346 
347         ret = clk_enable(phy->wkupclk);
348         if (ret < 0) {
349                 dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
350                 goto err0;
351         }
352 
353         if (!IS_ERR(phy->optclk)) {
354                 ret = clk_enable(phy->optclk);
355                 if (ret < 0) {
356                         dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
357                         goto err1;
358                 }
359         }
360 
361         return 0;
362 
363 err1:
364         clk_disable(phy->wkupclk);
365 
366 err0:
367         return ret;
368 }
369 
370 static const struct dev_pm_ops omap_usb2_pm_ops = {
371         SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
372                 NULL)
373 };
374 
375 #define DEV_PM_OPS     (&omap_usb2_pm_ops)
376 #else
377 #define DEV_PM_OPS     NULL
378 #endif
379 
380 static struct platform_driver omap_usb2_driver = {
381         .probe          = omap_usb2_probe,
382         .remove         = omap_usb2_remove,
383         .driver         = {
384                 .name   = "omap-usb2",
385                 .owner  = THIS_MODULE,
386                 .pm     = DEV_PM_OPS,
387                 .of_match_table = of_match_ptr(omap_usb2_id_table),
388         },
389 };
390 
391 module_platform_driver(omap_usb2_driver);
392 
393 MODULE_ALIAS("platform: omap_usb2");
394 MODULE_AUTHOR("Texas Instruments Inc.");
395 MODULE_DESCRIPTION("OMAP USB2 phy driver");
396 MODULE_LICENSE("GPL v2");
397 

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