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

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