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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->usb_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->usb_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         otg->host = host;
 84         if (!host)
 85                 otg->state = OTG_STATE_UNDEFINED;
 86 
 87         return 0;
 88 }
 89 
 90 static 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 
100 static 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 
109 static 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 
118 static 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                  * Reduce the sensitivity of internal PHY by enabling the
127                  * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
128                  * resolves issues with certain devices which can otherwise
129                  * be prone to false disconnects.
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 
140 static 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 
147 #ifdef CONFIG_OF
148 static const struct usb_phy_data omap_usb2_data = {
149         .label = "omap_usb2",
150         .flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS,
151 };
152 
153 static const struct usb_phy_data omap5_usb2_data = {
154         .label = "omap5_usb2",
155         .flags = 0,
156 };
157 
158 static const struct usb_phy_data dra7x_usb2_data = {
159         .label = "dra7x_usb2",
160         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
161 };
162 
163 static const struct usb_phy_data am437x_usb2_data = {
164         .label = "am437x_usb2",
165         .flags =  0,
166 };
167 
168 static const struct of_device_id omap_usb2_id_table[] = {
169         {
170                 .compatible = "ti,omap-usb2",
171                 .data = &omap_usb2_data,
172         },
173         {
174                 .compatible = "ti,omap5-usb2",
175                 .data = &omap5_usb2_data,
176         },
177         {
178                 .compatible = "ti,dra7x-usb2",
179                 .data = &dra7x_usb2_data,
180         },
181         {
182                 .compatible = "ti,am437x-usb2",
183                 .data = &am437x_usb2_data,
184         },
185         {},
186 };
187 MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
188 #endif
189 
190 static int omap_usb2_probe(struct platform_device *pdev)
191 {
192         struct omap_usb *phy;
193         struct phy *generic_phy;
194         struct resource *res;
195         struct phy_provider *phy_provider;
196         struct usb_otg *otg;
197         struct device_node *node = pdev->dev.of_node;
198         struct device_node *control_node;
199         struct platform_device *control_pdev;
200         const struct of_device_id *of_id;
201         struct usb_phy_data *phy_data;
202 
203         of_id = of_match_device(of_match_ptr(omap_usb2_id_table), &pdev->dev);
204 
205         if (!of_id)
206                 return -EINVAL;
207 
208         phy_data = (struct usb_phy_data *)of_id->data;
209 
210         phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
211         if (!phy)
212                 return -ENOMEM;
213 
214         otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
215         if (!otg)
216                 return -ENOMEM;
217 
218         phy->dev                = &pdev->dev;
219 
220         phy->phy.dev            = phy->dev;
221         phy->phy.label          = phy_data->label;
222         phy->phy.otg            = otg;
223         phy->phy.type           = USB_PHY_TYPE_USB2;
224 
225         if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
226                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
227                 phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
228                 if (IS_ERR(phy->phy_base))
229                         return PTR_ERR(phy->phy_base);
230                 phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
231         }
232 
233         control_node = of_parse_phandle(node, "ctrl-module", 0);
234         if (!control_node) {
235                 dev_err(&pdev->dev, "Failed to get control device phandle\n");
236                 return -EINVAL;
237         }
238 
239         control_pdev = of_find_device_by_node(control_node);
240         if (!control_pdev) {
241                 dev_err(&pdev->dev, "Failed to get control device\n");
242                 return -EINVAL;
243         }
244 
245         phy->control_dev = &control_pdev->dev;
246         omap_control_phy_power(phy->control_dev, 0);
247 
248         otg->set_host           = omap_usb_set_host;
249         otg->set_peripheral     = omap_usb_set_peripheral;
250         if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS)
251                 otg->set_vbus           = omap_usb_set_vbus;
252         if (phy_data->flags & OMAP_USB2_HAS_START_SRP)
253                 otg->start_srp          = omap_usb_start_srp;
254         otg->usb_phy            = &phy->phy;
255 
256         platform_set_drvdata(pdev, phy);
257         pm_runtime_enable(phy->dev);
258 
259         generic_phy = devm_phy_create(phy->dev, NULL, &ops);
260         if (IS_ERR(generic_phy)) {
261                 pm_runtime_disable(phy->dev);
262                 return PTR_ERR(generic_phy);
263         }
264 
265         phy_set_drvdata(generic_phy, phy);
266 
267         phy_provider = devm_of_phy_provider_register(phy->dev,
268                         of_phy_simple_xlate);
269         if (IS_ERR(phy_provider)) {
270                 pm_runtime_disable(phy->dev);
271                 return PTR_ERR(phy_provider);
272         }
273 
274         phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
275         if (IS_ERR(phy->wkupclk)) {
276                 dev_warn(&pdev->dev, "unable to get wkupclk, trying old name\n");
277                 phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
278                 if (IS_ERR(phy->wkupclk)) {
279                         dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
280                         return PTR_ERR(phy->wkupclk);
281                 } else {
282                         dev_warn(&pdev->dev,
283                                  "found usb_phy_cm_clk32k, please fix DTS\n");
284                 }
285         }
286         clk_prepare(phy->wkupclk);
287 
288         phy->optclk = devm_clk_get(phy->dev, "refclk");
289         if (IS_ERR(phy->optclk)) {
290                 dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n");
291                 phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
292                 if (IS_ERR(phy->optclk)) {
293                         dev_dbg(&pdev->dev,
294                                 "unable to get usb_otg_ss_refclk960m\n");
295                 } else {
296                         dev_warn(&pdev->dev,
297                                  "found usb_otg_ss_refclk960m, please fix DTS\n");
298                 }
299         }
300 
301         if (!IS_ERR(phy->optclk))
302                 clk_prepare(phy->optclk);
303 
304         usb_add_phy_dev(&phy->phy);
305 
306         return 0;
307 }
308 
309 static int omap_usb2_remove(struct platform_device *pdev)
310 {
311         struct omap_usb *phy = platform_get_drvdata(pdev);
312 
313         clk_unprepare(phy->wkupclk);
314         if (!IS_ERR(phy->optclk))
315                 clk_unprepare(phy->optclk);
316         usb_remove_phy(&phy->phy);
317         pm_runtime_disable(phy->dev);
318 
319         return 0;
320 }
321 
322 #ifdef CONFIG_PM
323 
324 static int omap_usb2_runtime_suspend(struct device *dev)
325 {
326         struct platform_device  *pdev = to_platform_device(dev);
327         struct omap_usb *phy = platform_get_drvdata(pdev);
328 
329         clk_disable(phy->wkupclk);
330         if (!IS_ERR(phy->optclk))
331                 clk_disable(phy->optclk);
332 
333         return 0;
334 }
335 
336 static int omap_usb2_runtime_resume(struct device *dev)
337 {
338         struct platform_device  *pdev = to_platform_device(dev);
339         struct omap_usb *phy = platform_get_drvdata(pdev);
340         int ret;
341 
342         ret = clk_enable(phy->wkupclk);
343         if (ret < 0) {
344                 dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
345                 goto err0;
346         }
347 
348         if (!IS_ERR(phy->optclk)) {
349                 ret = clk_enable(phy->optclk);
350                 if (ret < 0) {
351                         dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
352                         goto err1;
353                 }
354         }
355 
356         return 0;
357 
358 err1:
359         clk_disable(phy->wkupclk);
360 
361 err0:
362         return ret;
363 }
364 
365 static const struct dev_pm_ops omap_usb2_pm_ops = {
366         SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
367                 NULL)
368 };
369 
370 #define DEV_PM_OPS     (&omap_usb2_pm_ops)
371 #else
372 #define DEV_PM_OPS     NULL
373 #endif
374 
375 static struct platform_driver omap_usb2_driver = {
376         .probe          = omap_usb2_probe,
377         .remove         = omap_usb2_remove,
378         .driver         = {
379                 .name   = "omap-usb2",
380                 .pm     = DEV_PM_OPS,
381                 .of_match_table = of_match_ptr(omap_usb2_id_table),
382         },
383 };
384 
385 module_platform_driver(omap_usb2_driver);
386 
387 MODULE_ALIAS("platform:omap_usb2");
388 MODULE_AUTHOR("Texas Instruments Inc.");
389 MODULE_DESCRIPTION("OMAP USB2 phy driver");
390 MODULE_LICENSE("GPL v2");
391 

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