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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_usb2_disable_clocks(struct omap_usb *phy)
137 {
138         clk_disable(phy->wkupclk);
139         if (!IS_ERR(phy->optclk))
140                 clk_disable(phy->optclk);
141 
142         return 0;
143 }
144 
145 static int omap_usb2_enable_clocks(struct omap_usb *phy)
146 {
147         int ret;
148 
149         ret = clk_enable(phy->wkupclk);
150         if (ret < 0) {
151                 dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
152                 goto err0;
153         }
154 
155         if (!IS_ERR(phy->optclk)) {
156                 ret = clk_enable(phy->optclk);
157                 if (ret < 0) {
158                         dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
159                         goto err1;
160                 }
161         }
162 
163         return 0;
164 
165 err1:
166         clk_disable(phy->wkupclk);
167 
168 err0:
169         return ret;
170 }
171 
172 static int omap_usb_init(struct phy *x)
173 {
174         struct omap_usb *phy = phy_get_drvdata(x);
175         u32 val;
176 
177         omap_usb2_enable_clocks(phy);
178 
179         if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
180                 /*
181                  *
182                  * Reduce the sensitivity of internal PHY by enabling the
183                  * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
184                  * resolves issues with certain devices which can otherwise
185                  * be prone to false disconnects.
186                  *
187                  */
188                 val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1);
189                 val |= USB2PHY_DISCON_BYP_LATCH;
190                 omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
191         }
192 
193         return 0;
194 }
195 
196 static int omap_usb_exit(struct phy *x)
197 {
198         struct omap_usb *phy = phy_get_drvdata(x);
199 
200         return omap_usb2_disable_clocks(phy);
201 }
202 
203 static const struct phy_ops ops = {
204         .init           = omap_usb_init,
205         .exit           = omap_usb_exit,
206         .power_on       = omap_usb_power_on,
207         .power_off      = omap_usb_power_off,
208         .owner          = THIS_MODULE,
209 };
210 
211 static const struct usb_phy_data omap_usb2_data = {
212         .label = "omap_usb2",
213         .flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS,
214         .mask = OMAP_DEV_PHY_PD,
215         .power_off = OMAP_DEV_PHY_PD,
216 };
217 
218 static const struct usb_phy_data omap5_usb2_data = {
219         .label = "omap5_usb2",
220         .flags = 0,
221         .mask = OMAP_DEV_PHY_PD,
222         .power_off = OMAP_DEV_PHY_PD,
223 };
224 
225 static const struct usb_phy_data dra7x_usb2_data = {
226         .label = "dra7x_usb2",
227         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
228         .mask = OMAP_DEV_PHY_PD,
229         .power_off = OMAP_DEV_PHY_PD,
230 };
231 
232 static const struct usb_phy_data dra7x_usb2_phy2_data = {
233         .label = "dra7x_usb2_phy2",
234         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
235         .mask = OMAP_USB2_PHY_PD,
236         .power_off = OMAP_USB2_PHY_PD,
237 };
238 
239 static const struct usb_phy_data am437x_usb2_data = {
240         .label = "am437x_usb2",
241         .flags =  0,
242         .mask = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD |
243                 AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
244         .power_on = AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
245         .power_off = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD,
246 };
247 
248 static const struct of_device_id omap_usb2_id_table[] = {
249         {
250                 .compatible = "ti,omap-usb2",
251                 .data = &omap_usb2_data,
252         },
253         {
254                 .compatible = "ti,omap5-usb2",
255                 .data = &omap5_usb2_data,
256         },
257         {
258                 .compatible = "ti,dra7x-usb2",
259                 .data = &dra7x_usb2_data,
260         },
261         {
262                 .compatible = "ti,dra7x-usb2-phy2",
263                 .data = &dra7x_usb2_phy2_data,
264         },
265         {
266                 .compatible = "ti,am437x-usb2",
267                 .data = &am437x_usb2_data,
268         },
269         {},
270 };
271 MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
272 
273 static int omap_usb2_probe(struct platform_device *pdev)
274 {
275         struct omap_usb *phy;
276         struct phy *generic_phy;
277         struct resource *res;
278         struct phy_provider *phy_provider;
279         struct usb_otg *otg;
280         struct device_node *node = pdev->dev.of_node;
281         struct device_node *control_node;
282         struct platform_device *control_pdev;
283         const struct of_device_id *of_id;
284         struct usb_phy_data *phy_data;
285 
286         of_id = of_match_device(omap_usb2_id_table, &pdev->dev);
287 
288         if (!of_id)
289                 return -EINVAL;
290 
291         phy_data = (struct usb_phy_data *)of_id->data;
292 
293         phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
294         if (!phy)
295                 return -ENOMEM;
296 
297         otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
298         if (!otg)
299                 return -ENOMEM;
300 
301         phy->dev                = &pdev->dev;
302 
303         phy->phy.dev            = phy->dev;
304         phy->phy.label          = phy_data->label;
305         phy->phy.otg            = otg;
306         phy->phy.type           = USB_PHY_TYPE_USB2;
307         phy->mask               = phy_data->mask;
308         phy->power_on           = phy_data->power_on;
309         phy->power_off          = phy_data->power_off;
310 
311         if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
312                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
313                 phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
314                 if (IS_ERR(phy->phy_base))
315                         return PTR_ERR(phy->phy_base);
316                 phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
317         }
318 
319         phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node,
320                                                         "syscon-phy-power");
321         if (IS_ERR(phy->syscon_phy_power)) {
322                 dev_dbg(&pdev->dev,
323                         "can't get syscon-phy-power, using control device\n");
324                 phy->syscon_phy_power = NULL;
325 
326                 control_node = of_parse_phandle(node, "ctrl-module", 0);
327                 if (!control_node) {
328                         dev_err(&pdev->dev,
329                                 "Failed to get control device phandle\n");
330                         return -EINVAL;
331                 }
332 
333                 control_pdev = of_find_device_by_node(control_node);
334                 if (!control_pdev) {
335                         dev_err(&pdev->dev, "Failed to get control device\n");
336                         return -EINVAL;
337                 }
338                 phy->control_dev = &control_pdev->dev;
339         } else {
340                 if (of_property_read_u32_index(node,
341                                                "syscon-phy-power", 1,
342                                                &phy->power_reg)) {
343                         dev_err(&pdev->dev,
344                                 "couldn't get power reg. offset\n");
345                         return -EINVAL;
346                 }
347         }
348 
349         otg->set_host           = omap_usb_set_host;
350         otg->set_peripheral     = omap_usb_set_peripheral;
351         if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS)
352                 otg->set_vbus           = omap_usb_set_vbus;
353         if (phy_data->flags & OMAP_USB2_HAS_START_SRP)
354                 otg->start_srp          = omap_usb_start_srp;
355         otg->usb_phy            = &phy->phy;
356 
357         platform_set_drvdata(pdev, phy);
358         pm_runtime_enable(phy->dev);
359 
360         generic_phy = devm_phy_create(phy->dev, NULL, &ops);
361         if (IS_ERR(generic_phy)) {
362                 pm_runtime_disable(phy->dev);
363                 return PTR_ERR(generic_phy);
364         }
365 
366         phy_set_drvdata(generic_phy, phy);
367         omap_usb_power_off(generic_phy);
368 
369         phy_provider = devm_of_phy_provider_register(phy->dev,
370                         of_phy_simple_xlate);
371         if (IS_ERR(phy_provider)) {
372                 pm_runtime_disable(phy->dev);
373                 return PTR_ERR(phy_provider);
374         }
375 
376         phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
377         if (IS_ERR(phy->wkupclk)) {
378                 dev_warn(&pdev->dev, "unable to get wkupclk, trying old name\n");
379                 phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
380                 if (IS_ERR(phy->wkupclk)) {
381                         dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
382                         pm_runtime_disable(phy->dev);
383                         return PTR_ERR(phy->wkupclk);
384                 } else {
385                         dev_warn(&pdev->dev,
386                                  "found usb_phy_cm_clk32k, please fix DTS\n");
387                 }
388         }
389         clk_prepare(phy->wkupclk);
390 
391         phy->optclk = devm_clk_get(phy->dev, "refclk");
392         if (IS_ERR(phy->optclk)) {
393                 dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n");
394                 phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
395                 if (IS_ERR(phy->optclk)) {
396                         dev_dbg(&pdev->dev,
397                                 "unable to get usb_otg_ss_refclk960m\n");
398                 } else {
399                         dev_warn(&pdev->dev,
400                                  "found usb_otg_ss_refclk960m, please fix DTS\n");
401                 }
402         }
403 
404         if (!IS_ERR(phy->optclk))
405                 clk_prepare(phy->optclk);
406 
407         usb_add_phy_dev(&phy->phy);
408 
409         return 0;
410 }
411 
412 static int omap_usb2_remove(struct platform_device *pdev)
413 {
414         struct omap_usb *phy = platform_get_drvdata(pdev);
415 
416         clk_unprepare(phy->wkupclk);
417         if (!IS_ERR(phy->optclk))
418                 clk_unprepare(phy->optclk);
419         usb_remove_phy(&phy->phy);
420         pm_runtime_disable(phy->dev);
421 
422         return 0;
423 }
424 
425 static struct platform_driver omap_usb2_driver = {
426         .probe          = omap_usb2_probe,
427         .remove         = omap_usb2_remove,
428         .driver         = {
429                 .name   = "omap-usb2",
430                 .of_match_table = omap_usb2_id_table,
431         },
432 };
433 
434 module_platform_driver(omap_usb2_driver);
435 
436 MODULE_ALIAS("platform:omap_usb2");
437 MODULE_AUTHOR("Texas Instruments Inc.");
438 MODULE_DESCRIPTION("OMAP USB2 phy driver");
439 MODULE_LICENSE("GPL v2");
440 

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