]> Git Repo - linux.git/blob - drivers/usb/dwc2/platform.c
Merge branch 'for-linus-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux.git] / drivers / usb / dwc2 / platform.c
1 /*
2  * platform.c - DesignWare HS OTG Controller platform driver
3  *
4  * Copyright (C) Matthijs Kooijman <[email protected]>
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions, and the following disclaimer,
11  *    without modification.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. The names of the above-listed copyright holders may not be used
16  *    to endorse or promote products derived from this software without
17  *    specific prior written permission.
18  *
19  * ALTERNATIVELY, this software may be distributed under the terms of the
20  * GNU General Public License ("GPL") as published by the Free Software
21  * Foundation; either version 2 of the License, or (at your option) any
22  * later version.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
25  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
26  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
27  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
28  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
29  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
30  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
31  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35  */
36
37 #include <linux/kernel.h>
38 #include <linux/module.h>
39 #include <linux/slab.h>
40 #include <linux/clk.h>
41 #include <linux/device.h>
42 #include <linux/dma-mapping.h>
43 #include <linux/of_device.h>
44 #include <linux/mutex.h>
45 #include <linux/platform_device.h>
46 #include <linux/phy/phy.h>
47 #include <linux/platform_data/s3c-hsotg.h>
48 #include <linux/reset.h>
49
50 #include <linux/usb/of.h>
51
52 #include "core.h"
53 #include "hcd.h"
54 #include "debug.h"
55
56 static const char dwc2_driver_name[] = "dwc2";
57
58 /*
59  * Check the dr_mode against the module configuration and hardware
60  * capabilities.
61  *
62  * The hardware, module, and dr_mode, can each be set to host, device,
63  * or otg. Check that all these values are compatible and adjust the
64  * value of dr_mode if possible.
65  *
66  *                      actual
67  *    HW  MOD dr_mode   dr_mode
68  *  ------------------------------
69  *   HST  HST  any    :  HST
70  *   HST  DEV  any    :  ---
71  *   HST  OTG  any    :  HST
72  *
73  *   DEV  HST  any    :  ---
74  *   DEV  DEV  any    :  DEV
75  *   DEV  OTG  any    :  DEV
76  *
77  *   OTG  HST  any    :  HST
78  *   OTG  DEV  any    :  DEV
79  *   OTG  OTG  any    :  dr_mode
80  */
81 static int dwc2_get_dr_mode(struct dwc2_hsotg *hsotg)
82 {
83         enum usb_dr_mode mode;
84
85         hsotg->dr_mode = usb_get_dr_mode(hsotg->dev);
86         if (hsotg->dr_mode == USB_DR_MODE_UNKNOWN)
87                 hsotg->dr_mode = USB_DR_MODE_OTG;
88
89         mode = hsotg->dr_mode;
90
91         if (dwc2_hw_is_device(hsotg)) {
92                 if (IS_ENABLED(CONFIG_USB_DWC2_HOST)) {
93                         dev_err(hsotg->dev,
94                                 "Controller does not support host mode.\n");
95                         return -EINVAL;
96                 }
97                 mode = USB_DR_MODE_PERIPHERAL;
98         } else if (dwc2_hw_is_host(hsotg)) {
99                 if (IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL)) {
100                         dev_err(hsotg->dev,
101                                 "Controller does not support device mode.\n");
102                         return -EINVAL;
103                 }
104                 mode = USB_DR_MODE_HOST;
105         } else {
106                 if (IS_ENABLED(CONFIG_USB_DWC2_HOST))
107                         mode = USB_DR_MODE_HOST;
108                 else if (IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL))
109                         mode = USB_DR_MODE_PERIPHERAL;
110         }
111
112         if (mode != hsotg->dr_mode) {
113                 dev_warn(hsotg->dev,
114                          "Configuration mismatch. dr_mode forced to %s\n",
115                         mode == USB_DR_MODE_HOST ? "host" : "device");
116
117                 hsotg->dr_mode = mode;
118         }
119
120         return 0;
121 }
122
123 static int __dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg)
124 {
125         struct platform_device *pdev = to_platform_device(hsotg->dev);
126         int ret;
127
128         ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies),
129                                     hsotg->supplies);
130         if (ret)
131                 return ret;
132
133         if (hsotg->clk) {
134                 ret = clk_prepare_enable(hsotg->clk);
135                 if (ret)
136                         return ret;
137         }
138
139         if (hsotg->uphy) {
140                 ret = usb_phy_init(hsotg->uphy);
141         } else if (hsotg->plat && hsotg->plat->phy_init) {
142                 ret = hsotg->plat->phy_init(pdev, hsotg->plat->phy_type);
143         } else {
144                 ret = phy_power_on(hsotg->phy);
145                 if (ret == 0)
146                         ret = phy_init(hsotg->phy);
147         }
148
149         return ret;
150 }
151
152 /**
153  * dwc2_lowlevel_hw_enable - enable platform lowlevel hw resources
154  * @hsotg: The driver state
155  *
156  * A wrapper for platform code responsible for controlling
157  * low-level USB platform resources (phy, clock, regulators)
158  */
159 int dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg)
160 {
161         int ret = __dwc2_lowlevel_hw_enable(hsotg);
162
163         if (ret == 0)
164                 hsotg->ll_hw_enabled = true;
165         return ret;
166 }
167
168 static int __dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg)
169 {
170         struct platform_device *pdev = to_platform_device(hsotg->dev);
171         int ret = 0;
172
173         if (hsotg->uphy) {
174                 usb_phy_shutdown(hsotg->uphy);
175         } else if (hsotg->plat && hsotg->plat->phy_exit) {
176                 ret = hsotg->plat->phy_exit(pdev, hsotg->plat->phy_type);
177         } else {
178                 ret = phy_exit(hsotg->phy);
179                 if (ret == 0)
180                         ret = phy_power_off(hsotg->phy);
181         }
182         if (ret)
183                 return ret;
184
185         if (hsotg->clk)
186                 clk_disable_unprepare(hsotg->clk);
187
188         ret = regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies),
189                                      hsotg->supplies);
190
191         return ret;
192 }
193
194 /**
195  * dwc2_lowlevel_hw_disable - disable platform lowlevel hw resources
196  * @hsotg: The driver state
197  *
198  * A wrapper for platform code responsible for controlling
199  * low-level USB platform resources (phy, clock, regulators)
200  */
201 int dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg)
202 {
203         int ret = __dwc2_lowlevel_hw_disable(hsotg);
204
205         if (ret == 0)
206                 hsotg->ll_hw_enabled = false;
207         return ret;
208 }
209
210 static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
211 {
212         int i, ret;
213
214         hsotg->reset = devm_reset_control_get_optional(hsotg->dev, "dwc2");
215         if (IS_ERR(hsotg->reset)) {
216                 ret = PTR_ERR(hsotg->reset);
217                 dev_err(hsotg->dev, "error getting reset control %d\n", ret);
218                 return ret;
219         }
220
221         reset_control_deassert(hsotg->reset);
222
223         /* Set default UTMI width */
224         hsotg->phyif = GUSBCFG_PHYIF16;
225
226         /*
227          * Attempt to find a generic PHY, then look for an old style
228          * USB PHY and then fall back to pdata
229          */
230         hsotg->phy = devm_phy_get(hsotg->dev, "usb2-phy");
231         if (IS_ERR(hsotg->phy)) {
232                 ret = PTR_ERR(hsotg->phy);
233                 switch (ret) {
234                 case -ENODEV:
235                 case -ENOSYS:
236                         hsotg->phy = NULL;
237                         break;
238                 case -EPROBE_DEFER:
239                         return ret;
240                 default:
241                         dev_err(hsotg->dev, "error getting phy %d\n", ret);
242                         return ret;
243                 }
244         }
245
246         if (!hsotg->phy) {
247                 hsotg->uphy = devm_usb_get_phy(hsotg->dev, USB_PHY_TYPE_USB2);
248                 if (IS_ERR(hsotg->uphy)) {
249                         ret = PTR_ERR(hsotg->uphy);
250                         switch (ret) {
251                         case -ENODEV:
252                         case -ENXIO:
253                                 hsotg->uphy = NULL;
254                                 break;
255                         case -EPROBE_DEFER:
256                                 return ret;
257                         default:
258                                 dev_err(hsotg->dev, "error getting usb phy %d\n",
259                                         ret);
260                                 return ret;
261                         }
262                 }
263         }
264
265         hsotg->plat = dev_get_platdata(hsotg->dev);
266
267         if (hsotg->phy) {
268                 /*
269                  * If using the generic PHY framework, check if the PHY bus
270                  * width is 8-bit and set the phyif appropriately.
271                  */
272                 if (phy_get_bus_width(hsotg->phy) == 8)
273                         hsotg->phyif = GUSBCFG_PHYIF8;
274         }
275
276         /* Clock */
277         hsotg->clk = devm_clk_get(hsotg->dev, "otg");
278         if (IS_ERR(hsotg->clk)) {
279                 hsotg->clk = NULL;
280                 dev_dbg(hsotg->dev, "cannot get otg clock\n");
281         }
282
283         /* Regulators */
284         for (i = 0; i < ARRAY_SIZE(hsotg->supplies); i++)
285                 hsotg->supplies[i].supply = dwc2_hsotg_supply_names[i];
286
287         ret = devm_regulator_bulk_get(hsotg->dev, ARRAY_SIZE(hsotg->supplies),
288                                       hsotg->supplies);
289         if (ret) {
290                 dev_err(hsotg->dev, "failed to request supplies: %d\n", ret);
291                 return ret;
292         }
293         return 0;
294 }
295
296 /**
297  * dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the
298  * DWC_otg driver
299  *
300  * @dev: Platform device
301  *
302  * This routine is called, for example, when the rmmod command is executed. The
303  * device may or may not be electrically present. If it is present, the driver
304  * stops device processing. Any resources used on behalf of this device are
305  * freed.
306  */
307 static int dwc2_driver_remove(struct platform_device *dev)
308 {
309         struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
310
311         dwc2_debugfs_exit(hsotg);
312         if (hsotg->hcd_enabled)
313                 dwc2_hcd_remove(hsotg);
314         if (hsotg->gadget_enabled)
315                 dwc2_hsotg_remove(hsotg);
316
317         if (hsotg->ll_hw_enabled)
318                 dwc2_lowlevel_hw_disable(hsotg);
319
320         reset_control_assert(hsotg->reset);
321
322         return 0;
323 }
324
325 /**
326  * dwc2_driver_shutdown() - Called on device shutdown
327  *
328  * @dev: Platform device
329  *
330  * In specific conditions (involving usb hubs) dwc2 devices can create a
331  * lot of interrupts, even to the point of overwhelming devices running
332  * at low frequencies. Some devices need to do special clock handling
333  * at shutdown-time which may bring the system clock below the threshold
334  * of being able to handle the dwc2 interrupts. Disabling dwc2-irqs
335  * prevents reboots/poweroffs from getting stuck in such cases.
336  */
337 static void dwc2_driver_shutdown(struct platform_device *dev)
338 {
339         struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
340
341         disable_irq(hsotg->irq);
342 }
343
344 /**
345  * dwc2_driver_probe() - Called when the DWC_otg core is bound to the DWC_otg
346  * driver
347  *
348  * @dev: Platform device
349  *
350  * This routine creates the driver components required to control the device
351  * (core, HCD, and PCD) and initializes the device. The driver components are
352  * stored in a dwc2_hsotg structure. A reference to the dwc2_hsotg is saved
353  * in the device private data. This allows the driver to access the dwc2_hsotg
354  * structure on subsequent calls to driver methods for this device.
355  */
356 static int dwc2_driver_probe(struct platform_device *dev)
357 {
358         struct dwc2_hsotg *hsotg;
359         struct resource *res;
360         int retval;
361
362         hsotg = devm_kzalloc(&dev->dev, sizeof(*hsotg), GFP_KERNEL);
363         if (!hsotg)
364                 return -ENOMEM;
365
366         hsotg->dev = &dev->dev;
367
368         /*
369          * Use reasonable defaults so platforms don't have to provide these.
370          */
371         if (!dev->dev.dma_mask)
372                 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
373         retval = dma_set_coherent_mask(&dev->dev, DMA_BIT_MASK(32));
374         if (retval)
375                 return retval;
376
377         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
378         hsotg->regs = devm_ioremap_resource(&dev->dev, res);
379         if (IS_ERR(hsotg->regs))
380                 return PTR_ERR(hsotg->regs);
381
382         dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
383                 (unsigned long)res->start, hsotg->regs);
384
385         retval = dwc2_lowlevel_hw_init(hsotg);
386         if (retval)
387                 return retval;
388
389         spin_lock_init(&hsotg->lock);
390
391         hsotg->irq = platform_get_irq(dev, 0);
392         if (hsotg->irq < 0) {
393                 dev_err(&dev->dev, "missing IRQ resource\n");
394                 return hsotg->irq;
395         }
396
397         dev_dbg(hsotg->dev, "registering common handler for irq%d\n",
398                 hsotg->irq);
399         retval = devm_request_irq(hsotg->dev, hsotg->irq,
400                                   dwc2_handle_common_intr, IRQF_SHARED,
401                                   dev_name(hsotg->dev), hsotg);
402         if (retval)
403                 return retval;
404
405         retval = dwc2_lowlevel_hw_enable(hsotg);
406         if (retval)
407                 return retval;
408
409         retval = dwc2_get_dr_mode(hsotg);
410         if (retval)
411                 goto error;
412
413         /*
414          * Reset before dwc2_get_hwparams() then it could get power-on real
415          * reset value form registers.
416          */
417         dwc2_core_reset_and_force_dr_mode(hsotg);
418
419         /* Detect config values from hardware */
420         retval = dwc2_get_hwparams(hsotg);
421         if (retval)
422                 goto error;
423
424         dwc2_force_dr_mode(hsotg);
425
426         retval = dwc2_init_params(hsotg);
427         if (retval)
428                 goto error;
429
430         if (hsotg->dr_mode != USB_DR_MODE_HOST) {
431                 retval = dwc2_gadget_init(hsotg, hsotg->irq);
432                 if (retval)
433                         goto error;
434                 hsotg->gadget_enabled = 1;
435         }
436
437         if (hsotg->dr_mode != USB_DR_MODE_PERIPHERAL) {
438                 retval = dwc2_hcd_init(hsotg);
439                 if (retval) {
440                         if (hsotg->gadget_enabled)
441                                 dwc2_hsotg_remove(hsotg);
442                         goto error;
443                 }
444                 hsotg->hcd_enabled = 1;
445         }
446
447         platform_set_drvdata(dev, hsotg);
448
449         dwc2_debugfs_init(hsotg);
450
451         /* Gadget code manages lowlevel hw on its own */
452         if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL)
453                 dwc2_lowlevel_hw_disable(hsotg);
454
455         return 0;
456
457 error:
458         dwc2_lowlevel_hw_disable(hsotg);
459         return retval;
460 }
461
462 static int __maybe_unused dwc2_suspend(struct device *dev)
463 {
464         struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev);
465         int ret = 0;
466
467         if (dwc2_is_device_mode(dwc2))
468                 dwc2_hsotg_suspend(dwc2);
469
470         if (dwc2->ll_hw_enabled)
471                 ret = __dwc2_lowlevel_hw_disable(dwc2);
472
473         return ret;
474 }
475
476 static int __maybe_unused dwc2_resume(struct device *dev)
477 {
478         struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev);
479         int ret = 0;
480
481         if (dwc2->ll_hw_enabled) {
482                 ret = __dwc2_lowlevel_hw_enable(dwc2);
483                 if (ret)
484                         return ret;
485         }
486
487         if (dwc2_is_device_mode(dwc2))
488                 ret = dwc2_hsotg_resume(dwc2);
489
490         return ret;
491 }
492
493 static const struct dev_pm_ops dwc2_dev_pm_ops = {
494         SET_SYSTEM_SLEEP_PM_OPS(dwc2_suspend, dwc2_resume)
495 };
496
497 static struct platform_driver dwc2_platform_driver = {
498         .driver = {
499                 .name = dwc2_driver_name,
500                 .of_match_table = dwc2_of_match_table,
501                 .pm = &dwc2_dev_pm_ops,
502         },
503         .probe = dwc2_driver_probe,
504         .remove = dwc2_driver_remove,
505         .shutdown = dwc2_driver_shutdown,
506 };
507
508 module_platform_driver(dwc2_platform_driver);
509
510 MODULE_DESCRIPTION("DESIGNWARE HS OTG Platform Glue");
511 MODULE_AUTHOR("Matthijs Kooijman <[email protected]>");
512 MODULE_LICENSE("Dual BSD/GPL");
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