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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                 return -ENOMEM;
217 
218         otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
219         if (!otg)
220                 return -ENOMEM;
221 
222         phy->dev                = &pdev->dev;
223 
224         phy->phy.dev            = phy->dev;
225         phy->phy.label          = phy_data->label;
226         phy->phy.otg            = otg;
227         phy->phy.type           = USB_PHY_TYPE_USB2;
228 
229         if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
230                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
231                 phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
232                 if (IS_ERR(phy->phy_base))
233                         return PTR_ERR(phy->phy_base);
234                 phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
235         }
236 
237         control_node = of_parse_phandle(node, "ctrl-module", 0);
238         if (!control_node) {
239                 dev_err(&pdev->dev, "Failed to get control device phandle\n");
240                 return -EINVAL;
241         }
242 
243         control_pdev = of_find_device_by_node(control_node);
244         if (!control_pdev) {
245                 dev_err(&pdev->dev, "Failed to get control device\n");
246                 return -EINVAL;
247         }
248 
249         phy->control_dev = &control_pdev->dev;
250         omap_control_phy_power(phy->control_dev, 0);
251 
252         otg->set_host           = omap_usb_set_host;
253         otg->set_peripheral     = omap_usb_set_peripheral;
254         if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS)
255                 otg->set_vbus           = omap_usb_set_vbus;
256         if (phy_data->flags & OMAP_USB2_HAS_START_SRP)
257                 otg->start_srp          = omap_usb_start_srp;
258         otg->phy                = &phy->phy;
259 
260         platform_set_drvdata(pdev, phy);
261         pm_runtime_enable(phy->dev);
262 
263         generic_phy = devm_phy_create(phy->dev, NULL, &ops, NULL);
264         if (IS_ERR(generic_phy)) {
265                 pm_runtime_disable(phy->dev);
266                 return PTR_ERR(generic_phy);
267         }
268 
269         phy_set_drvdata(generic_phy, phy);
270 
271         phy_provider = devm_of_phy_provider_register(phy->dev,
272                         of_phy_simple_xlate);
273         if (IS_ERR(phy_provider)) {
274                 pm_runtime_disable(phy->dev);
275                 return PTR_ERR(phy_provider);
276         }
277 
278         phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
279         if (IS_ERR(phy->wkupclk)) {
280                 dev_warn(&pdev->dev, "unable to get wkupclk, trying old name\n");
281                 phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
282                 if (IS_ERR(phy->wkupclk)) {
283                         dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
284                         return PTR_ERR(phy->wkupclk);
285                 } else {
286                         dev_warn(&pdev->dev,
287                                  "found usb_phy_cm_clk32k, please fix DTS\n");
288                 }
289         }
290         clk_prepare(phy->wkupclk);
291 
292         phy->optclk = devm_clk_get(phy->dev, "refclk");
293         if (IS_ERR(phy->optclk)) {
294                 dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n");
295                 phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
296                 if (IS_ERR(phy->optclk)) {
297                         dev_dbg(&pdev->dev,
298                                 "unable to get usb_otg_ss_refclk960m\n");
299                 } else {
300                         dev_warn(&pdev->dev,
301                                  "found usb_otg_ss_refclk960m, please fix DTS\n");
302                 }
303         } else {
304                 clk_prepare(phy->optclk);
305         }
306 
307         usb_add_phy_dev(&phy->phy);
308 
309         return 0;
310 }
311 
312 static int omap_usb2_remove(struct platform_device *pdev)
313 {
314         struct omap_usb *phy = platform_get_drvdata(pdev);
315 
316         clk_unprepare(phy->wkupclk);
317         if (!IS_ERR(phy->optclk))
318                 clk_unprepare(phy->optclk);
319         usb_remove_phy(&phy->phy);
320         pm_runtime_disable(phy->dev);
321 
322         return 0;
323 }
324 
325 #ifdef CONFIG_PM_RUNTIME
326 
327 static int omap_usb2_runtime_suspend(struct device *dev)
328 {
329         struct platform_device  *pdev = to_platform_device(dev);
330         struct omap_usb *phy = platform_get_drvdata(pdev);
331 
332         clk_disable(phy->wkupclk);
333         if (!IS_ERR(phy->optclk))
334                 clk_disable(phy->optclk);
335 
336         return 0;
337 }
338 
339 static int omap_usb2_runtime_resume(struct device *dev)
340 {
341         struct platform_device  *pdev = to_platform_device(dev);
342         struct omap_usb *phy = platform_get_drvdata(pdev);
343         int ret;
344 
345         ret = clk_enable(phy->wkupclk);
346         if (ret < 0) {
347                 dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
348                 goto err0;
349         }
350 
351         if (!IS_ERR(phy->optclk)) {
352                 ret = clk_enable(phy->optclk);
353                 if (ret < 0) {
354                         dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
355                         goto err1;
356                 }
357         }
358 
359         return 0;
360 
361 err1:
362         clk_disable(phy->wkupclk);
363 
364 err0:
365         return ret;
366 }
367 
368 static const struct dev_pm_ops omap_usb2_pm_ops = {
369         SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
370                 NULL)
371 };
372 
373 #define DEV_PM_OPS     (&omap_usb2_pm_ops)
374 #else
375 #define DEV_PM_OPS     NULL
376 #endif
377 
378 static struct platform_driver omap_usb2_driver = {
379         .probe          = omap_usb2_probe,
380         .remove         = omap_usb2_remove,
381         .driver         = {
382                 .name   = "omap-usb2",
383                 .pm     = DEV_PM_OPS,
384                 .of_match_table = of_match_ptr(omap_usb2_id_table),
385         },
386 };
387 
388 module_platform_driver(omap_usb2_driver);
389 
390 MODULE_ALIAS("platform: omap_usb2");
391 MODULE_AUTHOR("Texas Instruments Inc.");
392 MODULE_DESCRIPTION("OMAP USB2 phy driver");
393 MODULE_LICENSE("GPL v2");
394 

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