usb: dwc2: Defer forcing peripheral mode
[platform/kernel/linux-rpi.git] / drivers / usb / dwc2 / core.c
1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
2 /*
3  * core.c - DesignWare HS OTG Controller common routines
4  *
5  * Copyright (C) 2004-2013 Synopsys, Inc.
6  */
7
8 /*
9  * The Core code provides basic services for accessing and managing the
10  * DWC_otg hardware. These services are used by both the Host Controller
11  * Driver and the Peripheral Controller Driver.
12  */
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/spinlock.h>
17 #include <linux/interrupt.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/delay.h>
20 #include <linux/io.h>
21 #include <linux/slab.h>
22 #include <linux/usb.h>
23
24 #include <linux/usb/hcd.h>
25 #include <linux/usb/ch11.h>
26
27 #include "core.h"
28 #include "hcd.h"
29
30 /**
31  * dwc2_backup_global_registers() - Backup global controller registers.
32  * When suspending usb bus, registers needs to be backuped
33  * if controller power is disabled once suspended.
34  *
35  * @hsotg: Programming view of the DWC_otg controller
36  */
37 int dwc2_backup_global_registers(struct dwc2_hsotg *hsotg)
38 {
39         struct dwc2_gregs_backup *gr;
40
41         dev_dbg(hsotg->dev, "%s\n", __func__);
42
43         /* Backup global regs */
44         gr = &hsotg->gr_backup;
45
46         gr->gotgctl = dwc2_readl(hsotg, GOTGCTL);
47         gr->gintmsk = dwc2_readl(hsotg, GINTMSK);
48         gr->gahbcfg = dwc2_readl(hsotg, GAHBCFG);
49         gr->gusbcfg = dwc2_readl(hsotg, GUSBCFG);
50         gr->grxfsiz = dwc2_readl(hsotg, GRXFSIZ);
51         gr->gnptxfsiz = dwc2_readl(hsotg, GNPTXFSIZ);
52         gr->gdfifocfg = dwc2_readl(hsotg, GDFIFOCFG);
53         gr->pcgcctl1 = dwc2_readl(hsotg, PCGCCTL1);
54         gr->glpmcfg = dwc2_readl(hsotg, GLPMCFG);
55         gr->gi2cctl = dwc2_readl(hsotg, GI2CCTL);
56         gr->pcgcctl = dwc2_readl(hsotg, PCGCTL);
57
58         gr->valid = true;
59         return 0;
60 }
61
62 /**
63  * dwc2_restore_global_registers() - Restore controller global registers.
64  * When resuming usb bus, device registers needs to be restored
65  * if controller power were disabled.
66  *
67  * @hsotg: Programming view of the DWC_otg controller
68  */
69 int dwc2_restore_global_registers(struct dwc2_hsotg *hsotg)
70 {
71         struct dwc2_gregs_backup *gr;
72
73         dev_dbg(hsotg->dev, "%s\n", __func__);
74
75         /* Restore global regs */
76         gr = &hsotg->gr_backup;
77         if (!gr->valid) {
78                 dev_err(hsotg->dev, "%s: no global registers to restore\n",
79                         __func__);
80                 return -EINVAL;
81         }
82         gr->valid = false;
83
84         dwc2_writel(hsotg, 0xffffffff, GINTSTS);
85         dwc2_writel(hsotg, gr->gotgctl, GOTGCTL);
86         dwc2_writel(hsotg, gr->gintmsk, GINTMSK);
87         dwc2_writel(hsotg, gr->gusbcfg, GUSBCFG);
88         dwc2_writel(hsotg, gr->gahbcfg, GAHBCFG);
89         dwc2_writel(hsotg, gr->grxfsiz, GRXFSIZ);
90         dwc2_writel(hsotg, gr->gnptxfsiz, GNPTXFSIZ);
91         dwc2_writel(hsotg, gr->gdfifocfg, GDFIFOCFG);
92         dwc2_writel(hsotg, gr->pcgcctl1, PCGCCTL1);
93         dwc2_writel(hsotg, gr->glpmcfg, GLPMCFG);
94         dwc2_writel(hsotg, gr->pcgcctl, PCGCTL);
95         dwc2_writel(hsotg, gr->gi2cctl, GI2CCTL);
96
97         return 0;
98 }
99
100 /**
101  * dwc2_exit_partial_power_down() - Exit controller from Partial Power Down.
102  *
103  * @hsotg: Programming view of the DWC_otg controller
104  * @rem_wakeup: indicates whether resume is initiated by Reset.
105  * @restore: Controller registers need to be restored
106  */
107 int dwc2_exit_partial_power_down(struct dwc2_hsotg *hsotg, int rem_wakeup,
108                                  bool restore)
109 {
110         struct dwc2_gregs_backup *gr;
111
112         gr = &hsotg->gr_backup;
113
114         /*
115          * Restore host or device regisers with the same mode core enterted
116          * to partial power down by checking "GOTGCTL_CURMODE_HOST" backup
117          * value of the "gotgctl" register.
118          */
119         if (gr->gotgctl & GOTGCTL_CURMODE_HOST)
120                 return dwc2_host_exit_partial_power_down(hsotg, rem_wakeup,
121                                                          restore);
122         else
123                 return dwc2_gadget_exit_partial_power_down(hsotg, restore);
124 }
125
126 /**
127  * dwc2_enter_partial_power_down() - Put controller in Partial Power Down.
128  *
129  * @hsotg: Programming view of the DWC_otg controller
130  */
131 int dwc2_enter_partial_power_down(struct dwc2_hsotg *hsotg)
132 {
133         if (dwc2_is_host_mode(hsotg))
134                 return dwc2_host_enter_partial_power_down(hsotg);
135         else
136                 return dwc2_gadget_enter_partial_power_down(hsotg);
137 }
138
139 /**
140  * dwc2_restore_essential_regs() - Restore essiential regs of core.
141  *
142  * @hsotg: Programming view of the DWC_otg controller
143  * @rmode: Restore mode, enabled in case of remote-wakeup.
144  * @is_host: Host or device mode.
145  */
146 static void dwc2_restore_essential_regs(struct dwc2_hsotg *hsotg, int rmode,
147                                         int is_host)
148 {
149         u32 pcgcctl;
150         struct dwc2_gregs_backup *gr;
151         struct dwc2_dregs_backup *dr;
152         struct dwc2_hregs_backup *hr;
153
154         gr = &hsotg->gr_backup;
155         dr = &hsotg->dr_backup;
156         hr = &hsotg->hr_backup;
157
158         dev_dbg(hsotg->dev, "%s: restoring essential regs\n", __func__);
159
160         /* Load restore values for [31:14] bits */
161         pcgcctl = (gr->pcgcctl & 0xffffc000);
162         /* If High Speed */
163         if (is_host) {
164                 if (!(pcgcctl & PCGCTL_P2HD_PRT_SPD_MASK))
165                         pcgcctl |= BIT(17);
166         } else {
167                 if (!(pcgcctl & PCGCTL_P2HD_DEV_ENUM_SPD_MASK))
168                         pcgcctl |= BIT(17);
169         }
170         dwc2_writel(hsotg, pcgcctl, PCGCTL);
171
172         /* Umnask global Interrupt in GAHBCFG and restore it */
173         dwc2_writel(hsotg, gr->gahbcfg | GAHBCFG_GLBL_INTR_EN, GAHBCFG);
174
175         /* Clear all pending interupts */
176         dwc2_writel(hsotg, 0xffffffff, GINTSTS);
177
178         /* Unmask restore done interrupt */
179         dwc2_writel(hsotg, GINTSTS_RESTOREDONE, GINTMSK);
180
181         /* Restore GUSBCFG and HCFG/DCFG */
182         dwc2_writel(hsotg, gr->gusbcfg, GUSBCFG);
183
184         if (is_host) {
185                 dwc2_writel(hsotg, hr->hcfg, HCFG);
186                 if (rmode)
187                         pcgcctl |= PCGCTL_RESTOREMODE;
188                 dwc2_writel(hsotg, pcgcctl, PCGCTL);
189                 udelay(10);
190
191                 pcgcctl |= PCGCTL_ESS_REG_RESTORED;
192                 dwc2_writel(hsotg, pcgcctl, PCGCTL);
193                 udelay(10);
194         } else {
195                 dwc2_writel(hsotg, dr->dcfg, DCFG);
196                 if (!rmode)
197                         pcgcctl |= PCGCTL_RESTOREMODE | PCGCTL_RSTPDWNMODULE;
198                 dwc2_writel(hsotg, pcgcctl, PCGCTL);
199                 udelay(10);
200
201                 pcgcctl |= PCGCTL_ESS_REG_RESTORED;
202                 dwc2_writel(hsotg, pcgcctl, PCGCTL);
203                 udelay(10);
204         }
205 }
206
207 /**
208  * dwc2_hib_restore_common() - Common part of restore routine.
209  *
210  * @hsotg: Programming view of the DWC_otg controller
211  * @rem_wakeup: Remote-wakeup, enabled in case of remote-wakeup.
212  * @is_host: Host or device mode.
213  */
214 void dwc2_hib_restore_common(struct dwc2_hsotg *hsotg, int rem_wakeup,
215                              int is_host)
216 {
217         u32 gpwrdn;
218
219         /* Switch-on voltage to the core */
220         gpwrdn = dwc2_readl(hsotg, GPWRDN);
221         gpwrdn &= ~GPWRDN_PWRDNSWTCH;
222         dwc2_writel(hsotg, gpwrdn, GPWRDN);
223         udelay(10);
224
225         /* Reset core */
226         gpwrdn = dwc2_readl(hsotg, GPWRDN);
227         gpwrdn &= ~GPWRDN_PWRDNRSTN;
228         dwc2_writel(hsotg, gpwrdn, GPWRDN);
229         udelay(10);
230
231         /* Enable restore from PMU */
232         gpwrdn = dwc2_readl(hsotg, GPWRDN);
233         gpwrdn |= GPWRDN_RESTORE;
234         dwc2_writel(hsotg, gpwrdn, GPWRDN);
235         udelay(10);
236
237         /* Disable Power Down Clamp */
238         gpwrdn = dwc2_readl(hsotg, GPWRDN);
239         gpwrdn &= ~GPWRDN_PWRDNCLMP;
240         dwc2_writel(hsotg, gpwrdn, GPWRDN);
241         udelay(50);
242
243         if (!is_host && rem_wakeup)
244                 udelay(70);
245
246         /* Deassert reset core */
247         gpwrdn = dwc2_readl(hsotg, GPWRDN);
248         gpwrdn |= GPWRDN_PWRDNRSTN;
249         dwc2_writel(hsotg, gpwrdn, GPWRDN);
250         udelay(10);
251
252         /* Disable PMU interrupt */
253         gpwrdn = dwc2_readl(hsotg, GPWRDN);
254         gpwrdn &= ~GPWRDN_PMUINTSEL;
255         dwc2_writel(hsotg, gpwrdn, GPWRDN);
256         udelay(10);
257
258         /* Set Restore Essential Regs bit in PCGCCTL register */
259         dwc2_restore_essential_regs(hsotg, rem_wakeup, is_host);
260
261         /*
262          * Wait For Restore_done Interrupt. This mechanism of polling the
263          * interrupt is introduced to avoid any possible race conditions
264          */
265         if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS, GINTSTS_RESTOREDONE,
266                                     20000)) {
267                 dev_dbg(hsotg->dev,
268                         "%s: Restore Done wasn't generated here\n",
269                         __func__);
270         } else {
271                 dev_dbg(hsotg->dev, "restore done  generated here\n");
272
273                 /*
274                  * To avoid restore done interrupt storm after restore is
275                  * generated clear GINTSTS_RESTOREDONE bit.
276                  */
277                 dwc2_writel(hsotg, GINTSTS_RESTOREDONE, GINTSTS);
278         }
279 }
280
281 /**
282  * dwc2_wait_for_mode() - Waits for the controller mode.
283  * @hsotg:      Programming view of the DWC_otg controller.
284  * @host_mode:  If true, waits for host mode, otherwise device mode.
285  */
286 static void dwc2_wait_for_mode(struct dwc2_hsotg *hsotg,
287                                bool host_mode)
288 {
289         ktime_t start;
290         ktime_t end;
291         unsigned int timeout = 110;
292
293         dev_vdbg(hsotg->dev, "Waiting for %s mode\n",
294                  host_mode ? "host" : "device");
295
296         start = ktime_get();
297
298         while (1) {
299                 s64 ms;
300
301                 if (dwc2_is_host_mode(hsotg) == host_mode) {
302                         dev_vdbg(hsotg->dev, "%s mode set\n",
303                                  host_mode ? "Host" : "Device");
304                         break;
305                 }
306
307                 end = ktime_get();
308                 ms = ktime_to_ms(ktime_sub(end, start));
309
310                 if (ms >= (s64)timeout) {
311                         dev_warn(hsotg->dev, "%s: Couldn't set %s mode\n",
312                                  __func__, host_mode ? "host" : "device");
313                         break;
314                 }
315
316                 usleep_range(1000, 2000);
317         }
318 }
319
320 /**
321  * dwc2_iddig_filter_enabled() - Returns true if the IDDIG debounce
322  * filter is enabled.
323  *
324  * @hsotg: Programming view of DWC_otg controller
325  */
326 static bool dwc2_iddig_filter_enabled(struct dwc2_hsotg *hsotg)
327 {
328         u32 gsnpsid;
329         u32 ghwcfg4;
330
331         if (!dwc2_hw_is_otg(hsotg))
332                 return false;
333
334         /* Check if core configuration includes the IDDIG filter. */
335         ghwcfg4 = dwc2_readl(hsotg, GHWCFG4);
336         if (!(ghwcfg4 & GHWCFG4_IDDIG_FILT_EN))
337                 return false;
338
339         /*
340          * Check if the IDDIG debounce filter is bypassed. Available
341          * in core version >= 3.10a.
342          */
343         gsnpsid = dwc2_readl(hsotg, GSNPSID);
344         if (gsnpsid >= DWC2_CORE_REV_3_10a) {
345                 u32 gotgctl = dwc2_readl(hsotg, GOTGCTL);
346
347                 if (gotgctl & GOTGCTL_DBNCE_FLTR_BYPASS)
348                         return false;
349         }
350
351         return true;
352 }
353
354 /*
355  * dwc2_enter_hibernation() - Common function to enter hibernation.
356  *
357  * @hsotg: Programming view of the DWC_otg controller
358  * @is_host: True if core is in host mode.
359  *
360  * Return: 0 if successful, negative error code otherwise
361  */
362 int dwc2_enter_hibernation(struct dwc2_hsotg *hsotg, int is_host)
363 {
364         if (is_host)
365                 return dwc2_host_enter_hibernation(hsotg);
366         else
367                 return dwc2_gadget_enter_hibernation(hsotg);
368 }
369
370 /*
371  * dwc2_exit_hibernation() - Common function to exit from hibernation.
372  *
373  * @hsotg: Programming view of the DWC_otg controller
374  * @rem_wakeup: Remote-wakeup, enabled in case of remote-wakeup.
375  * @reset: Enabled in case of restore with reset.
376  * @is_host: True if core is in host mode.
377  *
378  * Return: 0 if successful, negative error code otherwise
379  */
380 int dwc2_exit_hibernation(struct dwc2_hsotg *hsotg, int rem_wakeup,
381                           int reset, int is_host)
382 {
383         if (is_host)
384                 return dwc2_host_exit_hibernation(hsotg, rem_wakeup, reset);
385         else
386                 return dwc2_gadget_exit_hibernation(hsotg, rem_wakeup, reset);
387 }
388
389 /*
390  * Do core a soft reset of the core.  Be careful with this because it
391  * resets all the internal state machines of the core.
392  */
393 int dwc2_core_reset(struct dwc2_hsotg *hsotg, bool skip_wait)
394 {
395         u32 greset;
396         bool wait_for_host_mode = false;
397
398         dev_vdbg(hsotg->dev, "%s()\n", __func__);
399
400         /*
401          * If the current mode is host, either due to the force mode
402          * bit being set (which persists after core reset) or the
403          * connector id pin, a core soft reset will temporarily reset
404          * the mode to device. A delay from the IDDIG debounce filter
405          * will occur before going back to host mode.
406          *
407          * Determine whether we will go back into host mode after a
408          * reset and account for this delay after the reset.
409          */
410         if (dwc2_iddig_filter_enabled(hsotg)) {
411                 u32 gotgctl = dwc2_readl(hsotg, GOTGCTL);
412                 u32 gusbcfg = dwc2_readl(hsotg, GUSBCFG);
413
414                 if (!(gotgctl & GOTGCTL_CONID_B) ||
415                     (gusbcfg & GUSBCFG_FORCEHOSTMODE)) {
416                         wait_for_host_mode = true;
417                 }
418         }
419
420         /* Core Soft Reset */
421         greset = dwc2_readl(hsotg, GRSTCTL);
422         greset |= GRSTCTL_CSFTRST;
423         dwc2_writel(hsotg, greset, GRSTCTL);
424
425         if ((hsotg->hw_params.snpsid & DWC2_CORE_REV_MASK) <
426                 (DWC2_CORE_REV_4_20a & DWC2_CORE_REV_MASK)) {
427                 if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL,
428                                               GRSTCTL_CSFTRST, 10000)) {
429                         dev_warn(hsotg->dev, "%s: HANG! Soft Reset timeout GRSTCTL_CSFTRST\n",
430                                  __func__);
431                         return -EBUSY;
432                 }
433         } else {
434                 if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL,
435                                             GRSTCTL_CSFTRST_DONE, 10000)) {
436                         dev_warn(hsotg->dev, "%s: HANG! Soft Reset timeout GRSTCTL_CSFTRST_DONE\n",
437                                  __func__);
438                         return -EBUSY;
439                 }
440                 greset = dwc2_readl(hsotg, GRSTCTL);
441                 greset &= ~GRSTCTL_CSFTRST;
442                 greset |= GRSTCTL_CSFTRST_DONE;
443                 dwc2_writel(hsotg, greset, GRSTCTL);
444         }
445
446         /*
447          * Switching from device mode to host mode by disconnecting
448          * device cable core enters and exits form hibernation.
449          * However, the fifo map remains not cleared. It results
450          * to a WARNING (WARNING: CPU: 5 PID: 0 at drivers/usb/dwc2/
451          * gadget.c:307 dwc2_hsotg_init_fifo+0x12/0x152 [dwc2])
452          * if in host mode we disconnect the micro a to b host
453          * cable. Because core reset occurs.
454          * To avoid the WARNING, fifo_map should be cleared
455          * in dwc2_core_reset() function by taking into account configs.
456          * fifo_map must be cleared only if driver is configured in
457          * "CONFIG_USB_DWC2_PERIPHERAL" or "CONFIG_USB_DWC2_DUAL_ROLE"
458          * mode.
459          */
460         dwc2_clear_fifo_map(hsotg);
461
462         /* Wait for AHB master IDLE state */
463         if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, GRSTCTL_AHBIDLE, 10000)) {
464                 dev_warn(hsotg->dev, "%s: HANG! AHB Idle timeout GRSTCTL GRSTCTL_AHBIDLE\n",
465                          __func__);
466                 return -EBUSY;
467         }
468
469         if (wait_for_host_mode && !skip_wait)
470                 dwc2_wait_for_mode(hsotg, true);
471
472         return 0;
473 }
474
475 /**
476  * dwc2_force_mode() - Force the mode of the controller.
477  *
478  * Forcing the mode is needed for two cases:
479  *
480  * 1) If the dr_mode is set to either HOST or PERIPHERAL we force the
481  * controller to stay in a particular mode regardless of ID pin
482  * changes. We do this once during probe.
483  *
484  * 2) During probe we want to read reset values of the hw
485  * configuration registers that are only available in either host or
486  * device mode. We may need to force the mode if the current mode does
487  * not allow us to access the register in the mode that we want.
488  *
489  * In either case it only makes sense to force the mode if the
490  * controller hardware is OTG capable.
491  *
492  * Checks are done in this function to determine whether doing a force
493  * would be valid or not.
494  *
495  * If a force is done, it requires a IDDIG debounce filter delay if
496  * the filter is configured and enabled. We poll the current mode of
497  * the controller to account for this delay.
498  *
499  * @hsotg: Programming view of DWC_otg controller
500  * @host: Host mode flag
501  */
502 void dwc2_force_mode(struct dwc2_hsotg *hsotg, bool host)
503 {
504         u32 gusbcfg;
505         u32 set;
506         u32 clear;
507
508         dev_dbg(hsotg->dev, "Forcing mode to %s\n", host ? "host" : "device");
509
510         /*
511          * Force mode has no effect if the hardware is not OTG.
512          */
513         if (!dwc2_hw_is_otg(hsotg))
514                 return;
515
516         /*
517          * If dr_mode is either peripheral or host only, there is no
518          * need to ever force the mode to the opposite mode.
519          */
520         if (WARN_ON(host && hsotg->dr_mode == USB_DR_MODE_PERIPHERAL))
521                 return;
522
523         if (WARN_ON(!host && hsotg->dr_mode == USB_DR_MODE_HOST))
524                 return;
525
526         gusbcfg = dwc2_readl(hsotg, GUSBCFG);
527
528         set = host ? GUSBCFG_FORCEHOSTMODE : GUSBCFG_FORCEDEVMODE;
529         clear = host ? GUSBCFG_FORCEDEVMODE : GUSBCFG_FORCEHOSTMODE;
530
531         gusbcfg &= ~clear;
532         gusbcfg |= set;
533         dwc2_writel(hsotg, gusbcfg, GUSBCFG);
534
535         dwc2_wait_for_mode(hsotg, host);
536         return;
537 }
538
539 /**
540  * dwc2_clear_force_mode() - Clears the force mode bits.
541  *
542  * After clearing the bits, wait up to 100 ms to account for any
543  * potential IDDIG filter delay. We can't know if we expect this delay
544  * or not because the value of the connector ID status is affected by
545  * the force mode. We only need to call this once during probe if
546  * dr_mode == OTG.
547  *
548  * @hsotg: Programming view of DWC_otg controller
549  */
550 static void dwc2_clear_force_mode(struct dwc2_hsotg *hsotg)
551 {
552         u32 gusbcfg;
553
554         if (!dwc2_hw_is_otg(hsotg))
555                 return;
556
557         dev_dbg(hsotg->dev, "Clearing force mode bits\n");
558
559         gusbcfg = dwc2_readl(hsotg, GUSBCFG);
560         gusbcfg &= ~GUSBCFG_FORCEHOSTMODE;
561         gusbcfg &= ~GUSBCFG_FORCEDEVMODE;
562         dwc2_writel(hsotg, gusbcfg, GUSBCFG);
563
564         if (dwc2_iddig_filter_enabled(hsotg))
565                 msleep(100);
566 }
567
568 /*
569  * Sets or clears force mode based on the dr_mode parameter.
570  */
571 void dwc2_force_dr_mode(struct dwc2_hsotg *hsotg)
572 {
573         switch (hsotg->dr_mode) {
574         case USB_DR_MODE_HOST:
575                 /*
576                  * NOTE: This is required for some rockchip soc based
577                  * platforms on their host-only dwc2.
578                  */
579                 if (!dwc2_hw_is_otg(hsotg))
580                         msleep(50);
581
582                 break;
583         case USB_DR_MODE_PERIPHERAL:
584                 /*
585                  * To prevent early notification to host without any
586                  * preparation about device descriptor, forcing mode
587                  * is defered until gadget driver is ready.
588                  */
589                 /* dwc2_force_mode(hsotg, false); */
590                 break;
591         case USB_DR_MODE_OTG:
592                 dwc2_clear_force_mode(hsotg);
593                 break;
594         default:
595                 dev_warn(hsotg->dev, "%s() Invalid dr_mode=%d\n",
596                          __func__, hsotg->dr_mode);
597                 break;
598         }
599 }
600
601 /*
602  * dwc2_enable_acg - enable active clock gating feature
603  */
604 void dwc2_enable_acg(struct dwc2_hsotg *hsotg)
605 {
606         if (hsotg->params.acg_enable) {
607                 u32 pcgcctl1 = dwc2_readl(hsotg, PCGCCTL1);
608
609                 dev_dbg(hsotg->dev, "Enabling Active Clock Gating\n");
610                 pcgcctl1 |= PCGCCTL1_GATEEN;
611                 dwc2_writel(hsotg, pcgcctl1, PCGCCTL1);
612         }
613 }
614
615 /**
616  * dwc2_dump_host_registers() - Prints the host registers
617  *
618  * @hsotg: Programming view of DWC_otg controller
619  *
620  * NOTE: This function will be removed once the peripheral controller code
621  * is integrated and the driver is stable
622  */
623 void dwc2_dump_host_registers(struct dwc2_hsotg *hsotg)
624 {
625 #ifdef DEBUG
626         u32 __iomem *addr;
627         int i;
628
629         dev_dbg(hsotg->dev, "Host Global Registers\n");
630         addr = hsotg->regs + HCFG;
631         dev_dbg(hsotg->dev, "HCFG        @0x%08lX : 0x%08X\n",
632                 (unsigned long)addr, dwc2_readl(hsotg, HCFG));
633         addr = hsotg->regs + HFIR;
634         dev_dbg(hsotg->dev, "HFIR        @0x%08lX : 0x%08X\n",
635                 (unsigned long)addr, dwc2_readl(hsotg, HFIR));
636         addr = hsotg->regs + HFNUM;
637         dev_dbg(hsotg->dev, "HFNUM       @0x%08lX : 0x%08X\n",
638                 (unsigned long)addr, dwc2_readl(hsotg, HFNUM));
639         addr = hsotg->regs + HPTXSTS;
640         dev_dbg(hsotg->dev, "HPTXSTS     @0x%08lX : 0x%08X\n",
641                 (unsigned long)addr, dwc2_readl(hsotg, HPTXSTS));
642         addr = hsotg->regs + HAINT;
643         dev_dbg(hsotg->dev, "HAINT       @0x%08lX : 0x%08X\n",
644                 (unsigned long)addr, dwc2_readl(hsotg, HAINT));
645         addr = hsotg->regs + HAINTMSK;
646         dev_dbg(hsotg->dev, "HAINTMSK    @0x%08lX : 0x%08X\n",
647                 (unsigned long)addr, dwc2_readl(hsotg, HAINTMSK));
648         if (hsotg->params.dma_desc_enable) {
649                 addr = hsotg->regs + HFLBADDR;
650                 dev_dbg(hsotg->dev, "HFLBADDR @0x%08lX : 0x%08X\n",
651                         (unsigned long)addr, dwc2_readl(hsotg, HFLBADDR));
652         }
653
654         addr = hsotg->regs + HPRT0;
655         dev_dbg(hsotg->dev, "HPRT0       @0x%08lX : 0x%08X\n",
656                 (unsigned long)addr, dwc2_readl(hsotg, HPRT0));
657
658         for (i = 0; i < hsotg->params.host_channels; i++) {
659                 dev_dbg(hsotg->dev, "Host Channel %d Specific Registers\n", i);
660                 addr = hsotg->regs + HCCHAR(i);
661                 dev_dbg(hsotg->dev, "HCCHAR      @0x%08lX : 0x%08X\n",
662                         (unsigned long)addr, dwc2_readl(hsotg, HCCHAR(i)));
663                 addr = hsotg->regs + HCSPLT(i);
664                 dev_dbg(hsotg->dev, "HCSPLT      @0x%08lX : 0x%08X\n",
665                         (unsigned long)addr, dwc2_readl(hsotg, HCSPLT(i)));
666                 addr = hsotg->regs + HCINT(i);
667                 dev_dbg(hsotg->dev, "HCINT       @0x%08lX : 0x%08X\n",
668                         (unsigned long)addr, dwc2_readl(hsotg, HCINT(i)));
669                 addr = hsotg->regs + HCINTMSK(i);
670                 dev_dbg(hsotg->dev, "HCINTMSK    @0x%08lX : 0x%08X\n",
671                         (unsigned long)addr, dwc2_readl(hsotg, HCINTMSK(i)));
672                 addr = hsotg->regs + HCTSIZ(i);
673                 dev_dbg(hsotg->dev, "HCTSIZ      @0x%08lX : 0x%08X\n",
674                         (unsigned long)addr, dwc2_readl(hsotg, HCTSIZ(i)));
675                 addr = hsotg->regs + HCDMA(i);
676                 dev_dbg(hsotg->dev, "HCDMA       @0x%08lX : 0x%08X\n",
677                         (unsigned long)addr, dwc2_readl(hsotg, HCDMA(i)));
678                 if (hsotg->params.dma_desc_enable) {
679                         addr = hsotg->regs + HCDMAB(i);
680                         dev_dbg(hsotg->dev, "HCDMAB      @0x%08lX : 0x%08X\n",
681                                 (unsigned long)addr, dwc2_readl(hsotg,
682                                                                 HCDMAB(i)));
683                 }
684         }
685 #endif
686 }
687
688 /**
689  * dwc2_dump_global_registers() - Prints the core global registers
690  *
691  * @hsotg: Programming view of DWC_otg controller
692  *
693  * NOTE: This function will be removed once the peripheral controller code
694  * is integrated and the driver is stable
695  */
696 void dwc2_dump_global_registers(struct dwc2_hsotg *hsotg)
697 {
698 #ifdef DEBUG
699         u32 __iomem *addr;
700
701         dev_dbg(hsotg->dev, "Core Global Registers\n");
702         addr = hsotg->regs + GOTGCTL;
703         dev_dbg(hsotg->dev, "GOTGCTL     @0x%08lX : 0x%08X\n",
704                 (unsigned long)addr, dwc2_readl(hsotg, GOTGCTL));
705         addr = hsotg->regs + GOTGINT;
706         dev_dbg(hsotg->dev, "GOTGINT     @0x%08lX : 0x%08X\n",
707                 (unsigned long)addr, dwc2_readl(hsotg, GOTGINT));
708         addr = hsotg->regs + GAHBCFG;
709         dev_dbg(hsotg->dev, "GAHBCFG     @0x%08lX : 0x%08X\n",
710                 (unsigned long)addr, dwc2_readl(hsotg, GAHBCFG));
711         addr = hsotg->regs + GUSBCFG;
712         dev_dbg(hsotg->dev, "GUSBCFG     @0x%08lX : 0x%08X\n",
713                 (unsigned long)addr, dwc2_readl(hsotg, GUSBCFG));
714         addr = hsotg->regs + GRSTCTL;
715         dev_dbg(hsotg->dev, "GRSTCTL     @0x%08lX : 0x%08X\n",
716                 (unsigned long)addr, dwc2_readl(hsotg, GRSTCTL));
717         addr = hsotg->regs + GINTSTS;
718         dev_dbg(hsotg->dev, "GINTSTS     @0x%08lX : 0x%08X\n",
719                 (unsigned long)addr, dwc2_readl(hsotg, GINTSTS));
720         addr = hsotg->regs + GINTMSK;
721         dev_dbg(hsotg->dev, "GINTMSK     @0x%08lX : 0x%08X\n",
722                 (unsigned long)addr, dwc2_readl(hsotg, GINTMSK));
723         addr = hsotg->regs + GRXSTSR;
724         dev_dbg(hsotg->dev, "GRXSTSR     @0x%08lX : 0x%08X\n",
725                 (unsigned long)addr, dwc2_readl(hsotg, GRXSTSR));
726         addr = hsotg->regs + GRXFSIZ;
727         dev_dbg(hsotg->dev, "GRXFSIZ     @0x%08lX : 0x%08X\n",
728                 (unsigned long)addr, dwc2_readl(hsotg, GRXFSIZ));
729         addr = hsotg->regs + GNPTXFSIZ;
730         dev_dbg(hsotg->dev, "GNPTXFSIZ   @0x%08lX : 0x%08X\n",
731                 (unsigned long)addr, dwc2_readl(hsotg, GNPTXFSIZ));
732         addr = hsotg->regs + GNPTXSTS;
733         dev_dbg(hsotg->dev, "GNPTXSTS    @0x%08lX : 0x%08X\n",
734                 (unsigned long)addr, dwc2_readl(hsotg, GNPTXSTS));
735         addr = hsotg->regs + GI2CCTL;
736         dev_dbg(hsotg->dev, "GI2CCTL     @0x%08lX : 0x%08X\n",
737                 (unsigned long)addr, dwc2_readl(hsotg, GI2CCTL));
738         addr = hsotg->regs + GPVNDCTL;
739         dev_dbg(hsotg->dev, "GPVNDCTL    @0x%08lX : 0x%08X\n",
740                 (unsigned long)addr, dwc2_readl(hsotg, GPVNDCTL));
741         addr = hsotg->regs + GGPIO;
742         dev_dbg(hsotg->dev, "GGPIO       @0x%08lX : 0x%08X\n",
743                 (unsigned long)addr, dwc2_readl(hsotg, GGPIO));
744         addr = hsotg->regs + GUID;
745         dev_dbg(hsotg->dev, "GUID        @0x%08lX : 0x%08X\n",
746                 (unsigned long)addr, dwc2_readl(hsotg, GUID));
747         addr = hsotg->regs + GSNPSID;
748         dev_dbg(hsotg->dev, "GSNPSID     @0x%08lX : 0x%08X\n",
749                 (unsigned long)addr, dwc2_readl(hsotg, GSNPSID));
750         addr = hsotg->regs + GHWCFG1;
751         dev_dbg(hsotg->dev, "GHWCFG1     @0x%08lX : 0x%08X\n",
752                 (unsigned long)addr, dwc2_readl(hsotg, GHWCFG1));
753         addr = hsotg->regs + GHWCFG2;
754         dev_dbg(hsotg->dev, "GHWCFG2     @0x%08lX : 0x%08X\n",
755                 (unsigned long)addr, dwc2_readl(hsotg, GHWCFG2));
756         addr = hsotg->regs + GHWCFG3;
757         dev_dbg(hsotg->dev, "GHWCFG3     @0x%08lX : 0x%08X\n",
758                 (unsigned long)addr, dwc2_readl(hsotg, GHWCFG3));
759         addr = hsotg->regs + GHWCFG4;
760         dev_dbg(hsotg->dev, "GHWCFG4     @0x%08lX : 0x%08X\n",
761                 (unsigned long)addr, dwc2_readl(hsotg, GHWCFG4));
762         addr = hsotg->regs + GLPMCFG;
763         dev_dbg(hsotg->dev, "GLPMCFG     @0x%08lX : 0x%08X\n",
764                 (unsigned long)addr, dwc2_readl(hsotg, GLPMCFG));
765         addr = hsotg->regs + GPWRDN;
766         dev_dbg(hsotg->dev, "GPWRDN      @0x%08lX : 0x%08X\n",
767                 (unsigned long)addr, dwc2_readl(hsotg, GPWRDN));
768         addr = hsotg->regs + GDFIFOCFG;
769         dev_dbg(hsotg->dev, "GDFIFOCFG   @0x%08lX : 0x%08X\n",
770                 (unsigned long)addr, dwc2_readl(hsotg, GDFIFOCFG));
771         addr = hsotg->regs + HPTXFSIZ;
772         dev_dbg(hsotg->dev, "HPTXFSIZ    @0x%08lX : 0x%08X\n",
773                 (unsigned long)addr, dwc2_readl(hsotg, HPTXFSIZ));
774
775         addr = hsotg->regs + PCGCTL;
776         dev_dbg(hsotg->dev, "PCGCTL      @0x%08lX : 0x%08X\n",
777                 (unsigned long)addr, dwc2_readl(hsotg, PCGCTL));
778 #endif
779 }
780
781 /**
782  * dwc2_flush_tx_fifo() - Flushes a Tx FIFO
783  *
784  * @hsotg: Programming view of DWC_otg controller
785  * @num:   Tx FIFO to flush
786  */
787 void dwc2_flush_tx_fifo(struct dwc2_hsotg *hsotg, const int num)
788 {
789         u32 greset;
790
791         dev_vdbg(hsotg->dev, "Flush Tx FIFO %d\n", num);
792
793         /* Wait for AHB master IDLE state */
794         if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, GRSTCTL_AHBIDLE, 10000))
795                 dev_warn(hsotg->dev, "%s:  HANG! AHB Idle GRSCTL\n",
796                          __func__);
797
798         greset = GRSTCTL_TXFFLSH;
799         greset |= num << GRSTCTL_TXFNUM_SHIFT & GRSTCTL_TXFNUM_MASK;
800         dwc2_writel(hsotg, greset, GRSTCTL);
801
802         if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_TXFFLSH, 10000))
803                 dev_warn(hsotg->dev, "%s:  HANG! timeout GRSTCTL GRSTCTL_TXFFLSH\n",
804                          __func__);
805
806         /* Wait for at least 3 PHY Clocks */
807         udelay(1);
808 }
809
810 /**
811  * dwc2_flush_rx_fifo() - Flushes the Rx FIFO
812  *
813  * @hsotg: Programming view of DWC_otg controller
814  */
815 void dwc2_flush_rx_fifo(struct dwc2_hsotg *hsotg)
816 {
817         u32 greset;
818
819         dev_vdbg(hsotg->dev, "%s()\n", __func__);
820
821         /* Wait for AHB master IDLE state */
822         if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, GRSTCTL_AHBIDLE, 10000))
823                 dev_warn(hsotg->dev, "%s:  HANG! AHB Idle GRSCTL\n",
824                          __func__);
825
826         greset = GRSTCTL_RXFFLSH;
827         dwc2_writel(hsotg, greset, GRSTCTL);
828
829         /* Wait for RxFIFO flush done */
830         if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_RXFFLSH, 10000))
831                 dev_warn(hsotg->dev, "%s: HANG! timeout GRSTCTL GRSTCTL_RXFFLSH\n",
832                          __func__);
833
834         /* Wait for at least 3 PHY Clocks */
835         udelay(1);
836 }
837
838 bool dwc2_is_controller_alive(struct dwc2_hsotg *hsotg)
839 {
840         if (dwc2_readl(hsotg, GSNPSID) == 0xffffffff)
841                 return false;
842         else
843                 return true;
844 }
845
846 /**
847  * dwc2_enable_global_interrupts() - Enables the controller's Global
848  * Interrupt in the AHB Config register
849  *
850  * @hsotg: Programming view of DWC_otg controller
851  */
852 void dwc2_enable_global_interrupts(struct dwc2_hsotg *hsotg)
853 {
854         u32 ahbcfg = dwc2_readl(hsotg, GAHBCFG);
855
856         ahbcfg |= GAHBCFG_GLBL_INTR_EN;
857         dwc2_writel(hsotg, ahbcfg, GAHBCFG);
858 }
859
860 /**
861  * dwc2_disable_global_interrupts() - Disables the controller's Global
862  * Interrupt in the AHB Config register
863  *
864  * @hsotg: Programming view of DWC_otg controller
865  */
866 void dwc2_disable_global_interrupts(struct dwc2_hsotg *hsotg)
867 {
868         u32 ahbcfg = dwc2_readl(hsotg, GAHBCFG);
869
870         ahbcfg &= ~GAHBCFG_GLBL_INTR_EN;
871         dwc2_writel(hsotg, ahbcfg, GAHBCFG);
872 }
873
874 /* Returns the controller's GHWCFG2.OTG_MODE. */
875 unsigned int dwc2_op_mode(struct dwc2_hsotg *hsotg)
876 {
877         u32 ghwcfg2 = dwc2_readl(hsotg, GHWCFG2);
878
879         return (ghwcfg2 & GHWCFG2_OP_MODE_MASK) >>
880                 GHWCFG2_OP_MODE_SHIFT;
881 }
882
883 /* Returns true if the controller is capable of DRD. */
884 bool dwc2_hw_is_otg(struct dwc2_hsotg *hsotg)
885 {
886         unsigned int op_mode = dwc2_op_mode(hsotg);
887
888         return (op_mode == GHWCFG2_OP_MODE_HNP_SRP_CAPABLE) ||
889                 (op_mode == GHWCFG2_OP_MODE_SRP_ONLY_CAPABLE) ||
890                 (op_mode == GHWCFG2_OP_MODE_NO_HNP_SRP_CAPABLE);
891 }
892
893 /* Returns true if the controller is host-only. */
894 bool dwc2_hw_is_host(struct dwc2_hsotg *hsotg)
895 {
896         unsigned int op_mode = dwc2_op_mode(hsotg);
897
898         return (op_mode == GHWCFG2_OP_MODE_SRP_CAPABLE_HOST) ||
899                 (op_mode == GHWCFG2_OP_MODE_NO_SRP_CAPABLE_HOST);
900 }
901
902 /* Returns true if the controller is device-only. */
903 bool dwc2_hw_is_device(struct dwc2_hsotg *hsotg)
904 {
905         unsigned int op_mode = dwc2_op_mode(hsotg);
906
907         return (op_mode == GHWCFG2_OP_MODE_SRP_CAPABLE_DEVICE) ||
908                 (op_mode == GHWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE);
909 }
910
911 /**
912  * dwc2_hsotg_wait_bit_set - Waits for bit to be set.
913  * @hsotg: Programming view of DWC_otg controller.
914  * @offset: Register's offset where bit/bits must be set.
915  * @mask: Mask of the bit/bits which must be set.
916  * @timeout: Timeout to wait.
917  *
918  * Return: 0 if bit/bits are set or -ETIMEDOUT in case of timeout.
919  */
920 int dwc2_hsotg_wait_bit_set(struct dwc2_hsotg *hsotg, u32 offset, u32 mask,
921                             u32 timeout)
922 {
923         u32 i;
924
925         for (i = 0; i < timeout; i++) {
926                 if (dwc2_readl(hsotg, offset) & mask)
927                         return 0;
928                 udelay(1);
929         }
930
931         return -ETIMEDOUT;
932 }
933
934 /**
935  * dwc2_hsotg_wait_bit_clear - Waits for bit to be clear.
936  * @hsotg: Programming view of DWC_otg controller.
937  * @offset: Register's offset where bit/bits must be set.
938  * @mask: Mask of the bit/bits which must be set.
939  * @timeout: Timeout to wait.
940  *
941  * Return: 0 if bit/bits are set or -ETIMEDOUT in case of timeout.
942  */
943 int dwc2_hsotg_wait_bit_clear(struct dwc2_hsotg *hsotg, u32 offset, u32 mask,
944                               u32 timeout)
945 {
946         u32 i;
947
948         for (i = 0; i < timeout; i++) {
949                 if (!(dwc2_readl(hsotg, offset) & mask))
950                         return 0;
951                 udelay(1);
952         }
953
954         return -ETIMEDOUT;
955 }
956
957 /*
958  * Initializes the FSLSPClkSel field of the HCFG register depending on the
959  * PHY type
960  */
961 void dwc2_init_fs_ls_pclk_sel(struct dwc2_hsotg *hsotg)
962 {
963         u32 hcfg, val;
964
965         if ((hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_ULPI &&
966              hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED &&
967              hsotg->params.ulpi_fs_ls) ||
968             hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS) {
969                 /* Full speed PHY */
970                 val = HCFG_FSLSPCLKSEL_48_MHZ;
971         } else {
972                 /* High speed PHY running at full speed or high speed */
973                 val = HCFG_FSLSPCLKSEL_30_60_MHZ;
974         }
975
976         dev_dbg(hsotg->dev, "Initializing HCFG.FSLSPClkSel to %08x\n", val);
977         hcfg = dwc2_readl(hsotg, HCFG);
978         hcfg &= ~HCFG_FSLSPCLKSEL_MASK;
979         hcfg |= val << HCFG_FSLSPCLKSEL_SHIFT;
980         dwc2_writel(hsotg, hcfg, HCFG);
981 }
982
983 static int dwc2_fs_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
984 {
985         u32 usbcfg, ggpio, i2cctl;
986         int retval = 0;
987
988         /*
989          * core_init() is now called on every switch so only call the
990          * following for the first time through
991          */
992         if (select_phy) {
993                 dev_dbg(hsotg->dev, "FS PHY selected\n");
994
995                 usbcfg = dwc2_readl(hsotg, GUSBCFG);
996                 if (!(usbcfg & GUSBCFG_PHYSEL)) {
997                         usbcfg |= GUSBCFG_PHYSEL;
998                         dwc2_writel(hsotg, usbcfg, GUSBCFG);
999
1000                         if (dwc2_is_host_mode(hsotg)) {
1001                                 /* Reset after a PHY select */
1002                                 retval = dwc2_core_reset(hsotg, false);
1003
1004                                 if (retval) {
1005                                         dev_err(hsotg->dev,
1006                                                 "%s: Reset failed, aborting",
1007                                                 __func__);
1008                                         return retval;
1009                                 }
1010                         }
1011                 }
1012
1013                 if (hsotg->params.activate_stm_fs_transceiver) {
1014                         ggpio = dwc2_readl(hsotg, GGPIO);
1015                         if (!(ggpio & GGPIO_STM32_OTG_GCCFG_PWRDWN)) {
1016                                 dev_dbg(hsotg->dev, "Activating transceiver\n");
1017                                 /*
1018                                  * STM32F4x9 uses the GGPIO register as general
1019                                  * core configuration register.
1020                                  */
1021                                 ggpio |= GGPIO_STM32_OTG_GCCFG_PWRDWN;
1022                                 dwc2_writel(hsotg, ggpio, GGPIO);
1023                         }
1024                 }
1025         }
1026
1027         /*
1028          * Program DCFG.DevSpd or HCFG.FSLSPclkSel to 48Mhz in FS. Also
1029          * do this on HNP Dev/Host mode switches (done in dev_init and
1030          * host_init).
1031          */
1032         if (dwc2_is_host_mode(hsotg))
1033                 dwc2_init_fs_ls_pclk_sel(hsotg);
1034
1035         if (hsotg->params.i2c_enable) {
1036                 dev_dbg(hsotg->dev, "FS PHY enabling I2C\n");
1037
1038                 /* Program GUSBCFG.OtgUtmiFsSel to I2C */
1039                 usbcfg = dwc2_readl(hsotg, GUSBCFG);
1040                 usbcfg |= GUSBCFG_OTG_UTMI_FS_SEL;
1041                 dwc2_writel(hsotg, usbcfg, GUSBCFG);
1042
1043                 /* Program GI2CCTL.I2CEn */
1044                 i2cctl = dwc2_readl(hsotg, GI2CCTL);
1045                 i2cctl &= ~GI2CCTL_I2CDEVADDR_MASK;
1046                 i2cctl |= 1 << GI2CCTL_I2CDEVADDR_SHIFT;
1047                 i2cctl &= ~GI2CCTL_I2CEN;
1048                 dwc2_writel(hsotg, i2cctl, GI2CCTL);
1049                 i2cctl |= GI2CCTL_I2CEN;
1050                 dwc2_writel(hsotg, i2cctl, GI2CCTL);
1051         }
1052
1053         return retval;
1054 }
1055
1056 static int dwc2_hs_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
1057 {
1058         u32 usbcfg, usbcfg_old;
1059         int retval = 0;
1060
1061         if (!select_phy)
1062                 return 0;
1063
1064         usbcfg = dwc2_readl(hsotg, GUSBCFG);
1065         usbcfg_old = usbcfg;
1066
1067         /*
1068          * HS PHY parameters. These parameters are preserved during soft reset
1069          * so only program the first time. Do a soft reset immediately after
1070          * setting phyif.
1071          */
1072         switch (hsotg->params.phy_type) {
1073         case DWC2_PHY_TYPE_PARAM_ULPI:
1074                 /* ULPI interface */
1075                 dev_dbg(hsotg->dev, "HS ULPI PHY selected\n");
1076                 usbcfg |= GUSBCFG_ULPI_UTMI_SEL;
1077                 usbcfg &= ~(GUSBCFG_PHYIF16 | GUSBCFG_DDRSEL);
1078                 if (hsotg->params.phy_ulpi_ddr)
1079                         usbcfg |= GUSBCFG_DDRSEL;
1080
1081                 /* Set external VBUS indicator as needed. */
1082                 if (hsotg->params.oc_disable)
1083                         usbcfg |= (GUSBCFG_ULPI_INT_VBUS_IND |
1084                                    GUSBCFG_INDICATORPASSTHROUGH);
1085                 break;
1086         case DWC2_PHY_TYPE_PARAM_UTMI:
1087                 /* UTMI+ interface */
1088                 dev_dbg(hsotg->dev, "HS UTMI+ PHY selected\n");
1089                 usbcfg &= ~(GUSBCFG_ULPI_UTMI_SEL | GUSBCFG_PHYIF16);
1090                 if (hsotg->params.phy_utmi_width == 16)
1091                         usbcfg |= GUSBCFG_PHYIF16;
1092                 break;
1093         default:
1094                 dev_err(hsotg->dev, "FS PHY selected at HS!\n");
1095                 break;
1096         }
1097
1098         if (usbcfg != usbcfg_old) {
1099                 dwc2_writel(hsotg, usbcfg, GUSBCFG);
1100
1101                 if (dwc2_is_host_mode(hsotg)) {
1102                         /* Reset after setting the PHY parameters */
1103                         retval = dwc2_core_reset(hsotg, false);
1104                         if (retval) {
1105                                 dev_err(hsotg->dev,
1106                                         "%s: Reset failed, aborting", __func__);
1107                                 return retval;
1108                         }
1109                 }
1110         }
1111
1112         return retval;
1113 }
1114
1115 static void dwc2_set_turnaround_time(struct dwc2_hsotg *hsotg)
1116 {
1117         u32 usbcfg;
1118
1119         if (hsotg->params.phy_type != DWC2_PHY_TYPE_PARAM_UTMI)
1120                 return;
1121
1122         usbcfg = dwc2_readl(hsotg, GUSBCFG);
1123
1124         usbcfg &= ~GUSBCFG_USBTRDTIM_MASK;
1125         if (hsotg->params.phy_utmi_width == 16)
1126                 usbcfg |= 5 << GUSBCFG_USBTRDTIM_SHIFT;
1127         else
1128                 usbcfg |= 9 << GUSBCFG_USBTRDTIM_SHIFT;
1129
1130         dwc2_writel(hsotg, usbcfg, GUSBCFG);
1131 }
1132
1133 int dwc2_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
1134 {
1135         u32 usbcfg;
1136         u32 otgctl;
1137         int retval = 0;
1138
1139         if ((hsotg->params.speed == DWC2_SPEED_PARAM_FULL ||
1140              hsotg->params.speed == DWC2_SPEED_PARAM_LOW) &&
1141             hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS) {
1142                 /* If FS/LS mode with FS/LS PHY */
1143                 retval = dwc2_fs_phy_init(hsotg, select_phy);
1144                 if (retval)
1145                         return retval;
1146         } else {
1147                 /* High speed PHY */
1148                 retval = dwc2_hs_phy_init(hsotg, select_phy);
1149                 if (retval)
1150                         return retval;
1151
1152                 if (dwc2_is_device_mode(hsotg))
1153                         dwc2_set_turnaround_time(hsotg);
1154         }
1155
1156         if (hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_ULPI &&
1157             hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED &&
1158             hsotg->params.ulpi_fs_ls) {
1159                 dev_dbg(hsotg->dev, "Setting ULPI FSLS\n");
1160                 usbcfg = dwc2_readl(hsotg, GUSBCFG);
1161                 usbcfg |= GUSBCFG_ULPI_FS_LS;
1162                 usbcfg |= GUSBCFG_ULPI_CLK_SUSP_M;
1163                 dwc2_writel(hsotg, usbcfg, GUSBCFG);
1164         } else {
1165                 usbcfg = dwc2_readl(hsotg, GUSBCFG);
1166                 usbcfg &= ~GUSBCFG_ULPI_FS_LS;
1167                 usbcfg &= ~GUSBCFG_ULPI_CLK_SUSP_M;
1168                 dwc2_writel(hsotg, usbcfg, GUSBCFG);
1169         }
1170
1171         if (!hsotg->params.activate_ingenic_overcurrent_detection) {
1172                 if (dwc2_is_host_mode(hsotg)) {
1173                         otgctl = readl(hsotg->regs + GOTGCTL);
1174                         otgctl |= GOTGCTL_VBVALOEN | GOTGCTL_VBVALOVAL;
1175                         writel(otgctl, hsotg->regs + GOTGCTL);
1176                 }
1177         }
1178
1179         return retval;
1180 }
1181
1182 MODULE_DESCRIPTION("DESIGNWARE HS OTG Core");
1183 MODULE_AUTHOR("Synopsys, Inc.");
1184 MODULE_LICENSE("Dual BSD/GPL");