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1/*
2 * core.c - DesignWare HS OTG Controller common routines
3 *
4 * Copyright (C) 2004-2013 Synopsys, Inc.
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/*
38 * The Core code provides basic services for accessing and managing the
39 * DWC_otg hardware. These services are used by both the Host Controller
40 * Driver and the Peripheral Controller Driver.
41 */
42#include <linux/kernel.h>
43#include <linux/module.h>
44#include <linux/moduleparam.h>
45#include <linux/spinlock.h>
46#include <linux/interrupt.h>
47#include <linux/dma-mapping.h>
48#include <linux/delay.h>
49#include <linux/io.h>
50#include <linux/slab.h>
51#include <linux/usb.h>
52
53#include <linux/usb/hcd.h>
54#include <linux/usb/ch11.h>
55
56#include "core.h"
57#include "hcd.h"
58
59/**
60 * dwc2_backup_global_registers() - Backup global controller registers.
61 * When suspending usb bus, registers needs to be backuped
62 * if controller power is disabled once suspended.
63 *
64 * @hsotg: Programming view of the DWC_otg controller
65 */
66static int dwc2_backup_global_registers(struct dwc2_hsotg *hsotg)
67{
68 struct dwc2_gregs_backup *gr;
69 int i;
70
71 /* Backup global regs */
72 gr = &hsotg->gr_backup;
73
74 gr->gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
75 gr->gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
76 gr->gahbcfg = dwc2_readl(hsotg->regs + GAHBCFG);
77 gr->gusbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
78 gr->grxfsiz = dwc2_readl(hsotg->regs + GRXFSIZ);
79 gr->gnptxfsiz = dwc2_readl(hsotg->regs + GNPTXFSIZ);
80 gr->hptxfsiz = dwc2_readl(hsotg->regs + HPTXFSIZ);
81 gr->gdfifocfg = dwc2_readl(hsotg->regs + GDFIFOCFG);
82 for (i = 0; i < MAX_EPS_CHANNELS; i++)
83 gr->dtxfsiz[i] = dwc2_readl(hsotg->regs + DPTXFSIZN(i));
84
85 gr->valid = true;
86 return 0;
87}
88
89/**
90 * dwc2_restore_global_registers() - Restore controller global registers.
91 * When resuming usb bus, device registers needs to be restored
92 * if controller power were disabled.
93 *
94 * @hsotg: Programming view of the DWC_otg controller
95 */
96static int dwc2_restore_global_registers(struct dwc2_hsotg *hsotg)
97{
98 struct dwc2_gregs_backup *gr;
99 int i;
100
101 dev_dbg(hsotg->dev, "%s\n", __func__);
102
103 /* Restore global regs */
104 gr = &hsotg->gr_backup;
105 if (!gr->valid) {
106 dev_err(hsotg->dev, "%s: no global registers to restore\n",
107 __func__);
108 return -EINVAL;
109 }
110 gr->valid = false;
111
112 dwc2_writel(0xffffffff, hsotg->regs + GINTSTS);
113 dwc2_writel(gr->gotgctl, hsotg->regs + GOTGCTL);
114 dwc2_writel(gr->gintmsk, hsotg->regs + GINTMSK);
115 dwc2_writel(gr->gusbcfg, hsotg->regs + GUSBCFG);
116 dwc2_writel(gr->gahbcfg, hsotg->regs + GAHBCFG);
117 dwc2_writel(gr->grxfsiz, hsotg->regs + GRXFSIZ);
118 dwc2_writel(gr->gnptxfsiz, hsotg->regs + GNPTXFSIZ);
119 dwc2_writel(gr->hptxfsiz, hsotg->regs + HPTXFSIZ);
120 dwc2_writel(gr->gdfifocfg, hsotg->regs + GDFIFOCFG);
121 for (i = 0; i < MAX_EPS_CHANNELS; i++)
122 dwc2_writel(gr->dtxfsiz[i], hsotg->regs + DPTXFSIZN(i));
123
124 return 0;
125}
126
127/**
128 * dwc2_exit_hibernation() - Exit controller from Partial Power Down.
129 *
130 * @hsotg: Programming view of the DWC_otg controller
131 * @restore: Controller registers need to be restored
132 */
133int dwc2_exit_hibernation(struct dwc2_hsotg *hsotg, bool restore)
134{
135 u32 pcgcctl;
136 int ret = 0;
137
138 if (!hsotg->params.hibernation)
139 return -ENOTSUPP;
140
141 pcgcctl = dwc2_readl(hsotg->regs + PCGCTL);
142 pcgcctl &= ~PCGCTL_STOPPCLK;
143 dwc2_writel(pcgcctl, hsotg->regs + PCGCTL);
144
145 pcgcctl = dwc2_readl(hsotg->regs + PCGCTL);
146 pcgcctl &= ~PCGCTL_PWRCLMP;
147 dwc2_writel(pcgcctl, hsotg->regs + PCGCTL);
148
149 pcgcctl = dwc2_readl(hsotg->regs + PCGCTL);
150 pcgcctl &= ~PCGCTL_RSTPDWNMODULE;
151 dwc2_writel(pcgcctl, hsotg->regs + PCGCTL);
152
153 udelay(100);
154 if (restore) {
155 ret = dwc2_restore_global_registers(hsotg);
156 if (ret) {
157 dev_err(hsotg->dev, "%s: failed to restore registers\n",
158 __func__);
159 return ret;
160 }
161 if (dwc2_is_host_mode(hsotg)) {
162 ret = dwc2_restore_host_registers(hsotg);
163 if (ret) {
164 dev_err(hsotg->dev, "%s: failed to restore host registers\n",
165 __func__);
166 return ret;
167 }
168 } else {
169 ret = dwc2_restore_device_registers(hsotg);
170 if (ret) {
171 dev_err(hsotg->dev, "%s: failed to restore device registers\n",
172 __func__);
173 return ret;
174 }
175 }
176 }
177
178 return ret;
179}
180
181/**
182 * dwc2_enter_hibernation() - Put controller in Partial Power Down.
183 *
184 * @hsotg: Programming view of the DWC_otg controller
185 */
186int dwc2_enter_hibernation(struct dwc2_hsotg *hsotg)
187{
188 u32 pcgcctl;
189 int ret = 0;
190
191 if (!hsotg->params.hibernation)
192 return -ENOTSUPP;
193
194 /* Backup all registers */
195 ret = dwc2_backup_global_registers(hsotg);
196 if (ret) {
197 dev_err(hsotg->dev, "%s: failed to backup global registers\n",
198 __func__);
199 return ret;
200 }
201
202 if (dwc2_is_host_mode(hsotg)) {
203 ret = dwc2_backup_host_registers(hsotg);
204 if (ret) {
205 dev_err(hsotg->dev, "%s: failed to backup host registers\n",
206 __func__);
207 return ret;
208 }
209 } else {
210 ret = dwc2_backup_device_registers(hsotg);
211 if (ret) {
212 dev_err(hsotg->dev, "%s: failed to backup device registers\n",
213 __func__);
214 return ret;
215 }
216 }
217
218 /*
219 * Clear any pending interrupts since dwc2 will not be able to
220 * clear them after entering hibernation.
221 */
222 dwc2_writel(0xffffffff, hsotg->regs + GINTSTS);
223
224 /* Put the controller in low power state */
225 pcgcctl = dwc2_readl(hsotg->regs + PCGCTL);
226
227 pcgcctl |= PCGCTL_PWRCLMP;
228 dwc2_writel(pcgcctl, hsotg->regs + PCGCTL);
229 ndelay(20);
230
231 pcgcctl |= PCGCTL_RSTPDWNMODULE;
232 dwc2_writel(pcgcctl, hsotg->regs + PCGCTL);
233 ndelay(20);
234
235 pcgcctl |= PCGCTL_STOPPCLK;
236 dwc2_writel(pcgcctl, hsotg->regs + PCGCTL);
237
238 return ret;
239}
240
241/**
242 * dwc2_wait_for_mode() - Waits for the controller mode.
243 * @hsotg: Programming view of the DWC_otg controller.
244 * @host_mode: If true, waits for host mode, otherwise device mode.
245 */
246static void dwc2_wait_for_mode(struct dwc2_hsotg *hsotg,
247 bool host_mode)
248{
249 ktime_t start;
250 ktime_t end;
251 unsigned int timeout = 110;
252
253 dev_vdbg(hsotg->dev, "Waiting for %s mode\n",
254 host_mode ? "host" : "device");
255
256 start = ktime_get();
257
258 while (1) {
259 s64 ms;
260
261 if (dwc2_is_host_mode(hsotg) == host_mode) {
262 dev_vdbg(hsotg->dev, "%s mode set\n",
263 host_mode ? "Host" : "Device");
264 break;
265 }
266
267 end = ktime_get();
268 ms = ktime_to_ms(ktime_sub(end, start));
269
270 if (ms >= (s64)timeout) {
271 dev_warn(hsotg->dev, "%s: Couldn't set %s mode\n",
272 __func__, host_mode ? "host" : "device");
273 break;
274 }
275
276 usleep_range(1000, 2000);
277 }
278}
279
280/**
281 * dwc2_iddig_filter_enabled() - Returns true if the IDDIG debounce
282 * filter is enabled.
283 */
284static bool dwc2_iddig_filter_enabled(struct dwc2_hsotg *hsotg)
285{
286 u32 gsnpsid;
287 u32 ghwcfg4;
288
289 if (!dwc2_hw_is_otg(hsotg))
290 return false;
291
292 /* Check if core configuration includes the IDDIG filter. */
293 ghwcfg4 = dwc2_readl(hsotg->regs + GHWCFG4);
294 if (!(ghwcfg4 & GHWCFG4_IDDIG_FILT_EN))
295 return false;
296
297 /*
298 * Check if the IDDIG debounce filter is bypassed. Available
299 * in core version >= 3.10a.
300 */
301 gsnpsid = dwc2_readl(hsotg->regs + GSNPSID);
302 if (gsnpsid >= DWC2_CORE_REV_3_10a) {
303 u32 gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
304
305 if (gotgctl & GOTGCTL_DBNCE_FLTR_BYPASS)
306 return false;
307 }
308
309 return true;
310}
311
312/*
313 * Do core a soft reset of the core. Be careful with this because it
314 * resets all the internal state machines of the core.
315 */
316int dwc2_core_reset(struct dwc2_hsotg *hsotg)
317{
318 u32 greset;
319 int count = 0;
320 bool wait_for_host_mode = false;
321
322 dev_vdbg(hsotg->dev, "%s()\n", __func__);
323
324 /*
325 * If the current mode is host, either due to the force mode
326 * bit being set (which persists after core reset) or the
327 * connector id pin, a core soft reset will temporarily reset
328 * the mode to device. A delay from the IDDIG debounce filter
329 * will occur before going back to host mode.
330 *
331 * Determine whether we will go back into host mode after a
332 * reset and account for this delay after the reset.
333 */
334 if (dwc2_iddig_filter_enabled(hsotg)) {
335 u32 gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
336 u32 gusbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
337
338 if (!(gotgctl & GOTGCTL_CONID_B) ||
339 (gusbcfg & GUSBCFG_FORCEHOSTMODE)) {
340 wait_for_host_mode = true;
341 }
342 }
343
344 /* Core Soft Reset */
345 greset = dwc2_readl(hsotg->regs + GRSTCTL);
346 greset |= GRSTCTL_CSFTRST;
347 dwc2_writel(greset, hsotg->regs + GRSTCTL);
348 do {
349 udelay(1);
350 greset = dwc2_readl(hsotg->regs + GRSTCTL);
351 if (++count > 50) {
352 dev_warn(hsotg->dev,
353 "%s() HANG! Soft Reset GRSTCTL=%0x\n",
354 __func__, greset);
355 return -EBUSY;
356 }
357 } while (greset & GRSTCTL_CSFTRST);
358
359 /* Wait for AHB master IDLE state */
360 count = 0;
361 do {
362 udelay(1);
363 greset = dwc2_readl(hsotg->regs + GRSTCTL);
364 if (++count > 50) {
365 dev_warn(hsotg->dev,
366 "%s() HANG! AHB Idle GRSTCTL=%0x\n",
367 __func__, greset);
368 return -EBUSY;
369 }
370 } while (!(greset & GRSTCTL_AHBIDLE));
371
372 if (wait_for_host_mode)
373 dwc2_wait_for_mode(hsotg, true);
374
375 return 0;
376}
377
378/*
379 * Force the mode of the controller.
380 *
381 * Forcing the mode is needed for two cases:
382 *
383 * 1) If the dr_mode is set to either HOST or PERIPHERAL we force the
384 * controller to stay in a particular mode regardless of ID pin
385 * changes. We do this usually after a core reset.
386 *
387 * 2) During probe we want to read reset values of the hw
388 * configuration registers that are only available in either host or
389 * device mode. We may need to force the mode if the current mode does
390 * not allow us to access the register in the mode that we want.
391 *
392 * In either case it only makes sense to force the mode if the
393 * controller hardware is OTG capable.
394 *
395 * Checks are done in this function to determine whether doing a force
396 * would be valid or not.
397 *
398 * If a force is done, it requires a IDDIG debounce filter delay if
399 * the filter is configured and enabled. We poll the current mode of
400 * the controller to account for this delay.
401 */
402static bool dwc2_force_mode(struct dwc2_hsotg *hsotg, bool host)
403{
404 u32 gusbcfg;
405 u32 set;
406 u32 clear;
407
408 dev_dbg(hsotg->dev, "Forcing mode to %s\n", host ? "host" : "device");
409
410 /*
411 * Force mode has no effect if the hardware is not OTG.
412 */
413 if (!dwc2_hw_is_otg(hsotg))
414 return false;
415
416 /*
417 * If dr_mode is either peripheral or host only, there is no
418 * need to ever force the mode to the opposite mode.
419 */
420 if (WARN_ON(host && hsotg->dr_mode == USB_DR_MODE_PERIPHERAL))
421 return false;
422
423 if (WARN_ON(!host && hsotg->dr_mode == USB_DR_MODE_HOST))
424 return false;
425
426 gusbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
427
428 set = host ? GUSBCFG_FORCEHOSTMODE : GUSBCFG_FORCEDEVMODE;
429 clear = host ? GUSBCFG_FORCEDEVMODE : GUSBCFG_FORCEHOSTMODE;
430
431 gusbcfg &= ~clear;
432 gusbcfg |= set;
433 dwc2_writel(gusbcfg, hsotg->regs + GUSBCFG);
434
435 dwc2_wait_for_mode(hsotg, host);
436 return true;
437}
438
439/**
440 * dwc2_clear_force_mode() - Clears the force mode bits.
441 *
442 * After clearing the bits, wait up to 100 ms to account for any
443 * potential IDDIG filter delay. We can't know if we expect this delay
444 * or not because the value of the connector ID status is affected by
445 * the force mode. We only need to call this once during probe if
446 * dr_mode == OTG.
447 */
448void dwc2_clear_force_mode(struct dwc2_hsotg *hsotg)
449{
450 u32 gusbcfg;
451
452 gusbcfg = dwc2_readl(hsotg->regs + GUSBCFG);
453 gusbcfg &= ~GUSBCFG_FORCEHOSTMODE;
454 gusbcfg &= ~GUSBCFG_FORCEDEVMODE;
455 dwc2_writel(gusbcfg, hsotg->regs + GUSBCFG);
456
457 if (dwc2_iddig_filter_enabled(hsotg))
458 usleep_range(100000, 110000);
459}
460
461/*
462 * Sets or clears force mode based on the dr_mode parameter.
463 */
464void dwc2_force_dr_mode(struct dwc2_hsotg *hsotg)
465{
466 bool ret;
467
468 switch (hsotg->dr_mode) {
469 case USB_DR_MODE_HOST:
470 ret = dwc2_force_mode(hsotg, true);
471 /*
472 * NOTE: This is required for some rockchip soc based
473 * platforms on their host-only dwc2.
474 */
475 if (!ret)
476 msleep(50);
477
478 break;
479 case USB_DR_MODE_PERIPHERAL:
480 dwc2_force_mode(hsotg, false);
481 break;
482 case USB_DR_MODE_OTG:
483 dwc2_clear_force_mode(hsotg);
484 break;
485 default:
486 dev_warn(hsotg->dev, "%s() Invalid dr_mode=%d\n",
487 __func__, hsotg->dr_mode);
488 break;
489 }
490}
491
492/*
493 * Do core a soft reset of the core. Be careful with this because it
494 * resets all the internal state machines of the core.
495 *
496 * Additionally this will apply force mode as per the hsotg->dr_mode
497 * parameter.
498 */
499int dwc2_core_reset_and_force_dr_mode(struct dwc2_hsotg *hsotg)
500{
501 int retval;
502
503 retval = dwc2_core_reset(hsotg);
504 if (retval)
505 return retval;
506
507 dwc2_force_dr_mode(hsotg);
508 return 0;
509}
510
511/**
512 * dwc2_dump_host_registers() - Prints the host registers
513 *
514 * @hsotg: Programming view of DWC_otg controller
515 *
516 * NOTE: This function will be removed once the peripheral controller code
517 * is integrated and the driver is stable
518 */
519void dwc2_dump_host_registers(struct dwc2_hsotg *hsotg)
520{
521#ifdef DEBUG
522 u32 __iomem *addr;
523 int i;
524
525 dev_dbg(hsotg->dev, "Host Global Registers\n");
526 addr = hsotg->regs + HCFG;
527 dev_dbg(hsotg->dev, "HCFG @0x%08lX : 0x%08X\n",
528 (unsigned long)addr, dwc2_readl(addr));
529 addr = hsotg->regs + HFIR;
530 dev_dbg(hsotg->dev, "HFIR @0x%08lX : 0x%08X\n",
531 (unsigned long)addr, dwc2_readl(addr));
532 addr = hsotg->regs + HFNUM;
533 dev_dbg(hsotg->dev, "HFNUM @0x%08lX : 0x%08X\n",
534 (unsigned long)addr, dwc2_readl(addr));
535 addr = hsotg->regs + HPTXSTS;
536 dev_dbg(hsotg->dev, "HPTXSTS @0x%08lX : 0x%08X\n",
537 (unsigned long)addr, dwc2_readl(addr));
538 addr = hsotg->regs + HAINT;
539 dev_dbg(hsotg->dev, "HAINT @0x%08lX : 0x%08X\n",
540 (unsigned long)addr, dwc2_readl(addr));
541 addr = hsotg->regs + HAINTMSK;
542 dev_dbg(hsotg->dev, "HAINTMSK @0x%08lX : 0x%08X\n",
543 (unsigned long)addr, dwc2_readl(addr));
544 if (hsotg->params.dma_desc_enable > 0) {
545 addr = hsotg->regs + HFLBADDR;
546 dev_dbg(hsotg->dev, "HFLBADDR @0x%08lX : 0x%08X\n",
547 (unsigned long)addr, dwc2_readl(addr));
548 }
549
550 addr = hsotg->regs + HPRT0;
551 dev_dbg(hsotg->dev, "HPRT0 @0x%08lX : 0x%08X\n",
552 (unsigned long)addr, dwc2_readl(addr));
553
554 for (i = 0; i < hsotg->params.host_channels; i++) {
555 dev_dbg(hsotg->dev, "Host Channel %d Specific Registers\n", i);
556 addr = hsotg->regs + HCCHAR(i);
557 dev_dbg(hsotg->dev, "HCCHAR @0x%08lX : 0x%08X\n",
558 (unsigned long)addr, dwc2_readl(addr));
559 addr = hsotg->regs + HCSPLT(i);
560 dev_dbg(hsotg->dev, "HCSPLT @0x%08lX : 0x%08X\n",
561 (unsigned long)addr, dwc2_readl(addr));
562 addr = hsotg->regs + HCINT(i);
563 dev_dbg(hsotg->dev, "HCINT @0x%08lX : 0x%08X\n",
564 (unsigned long)addr, dwc2_readl(addr));
565 addr = hsotg->regs + HCINTMSK(i);
566 dev_dbg(hsotg->dev, "HCINTMSK @0x%08lX : 0x%08X\n",
567 (unsigned long)addr, dwc2_readl(addr));
568 addr = hsotg->regs + HCTSIZ(i);
569 dev_dbg(hsotg->dev, "HCTSIZ @0x%08lX : 0x%08X\n",
570 (unsigned long)addr, dwc2_readl(addr));
571 addr = hsotg->regs + HCDMA(i);
572 dev_dbg(hsotg->dev, "HCDMA @0x%08lX : 0x%08X\n",
573 (unsigned long)addr, dwc2_readl(addr));
574 if (hsotg->params.dma_desc_enable > 0) {
575 addr = hsotg->regs + HCDMAB(i);
576 dev_dbg(hsotg->dev, "HCDMAB @0x%08lX : 0x%08X\n",
577 (unsigned long)addr, dwc2_readl(addr));
578 }
579 }
580#endif
581}
582
583/**
584 * dwc2_dump_global_registers() - Prints the core global registers
585 *
586 * @hsotg: Programming view of DWC_otg controller
587 *
588 * NOTE: This function will be removed once the peripheral controller code
589 * is integrated and the driver is stable
590 */
591void dwc2_dump_global_registers(struct dwc2_hsotg *hsotg)
592{
593#ifdef DEBUG
594 u32 __iomem *addr;
595
596 dev_dbg(hsotg->dev, "Core Global Registers\n");
597 addr = hsotg->regs + GOTGCTL;
598 dev_dbg(hsotg->dev, "GOTGCTL @0x%08lX : 0x%08X\n",
599 (unsigned long)addr, dwc2_readl(addr));
600 addr = hsotg->regs + GOTGINT;
601 dev_dbg(hsotg->dev, "GOTGINT @0x%08lX : 0x%08X\n",
602 (unsigned long)addr, dwc2_readl(addr));
603 addr = hsotg->regs + GAHBCFG;
604 dev_dbg(hsotg->dev, "GAHBCFG @0x%08lX : 0x%08X\n",
605 (unsigned long)addr, dwc2_readl(addr));
606 addr = hsotg->regs + GUSBCFG;
607 dev_dbg(hsotg->dev, "GUSBCFG @0x%08lX : 0x%08X\n",
608 (unsigned long)addr, dwc2_readl(addr));
609 addr = hsotg->regs + GRSTCTL;
610 dev_dbg(hsotg->dev, "GRSTCTL @0x%08lX : 0x%08X\n",
611 (unsigned long)addr, dwc2_readl(addr));
612 addr = hsotg->regs + GINTSTS;
613 dev_dbg(hsotg->dev, "GINTSTS @0x%08lX : 0x%08X\n",
614 (unsigned long)addr, dwc2_readl(addr));
615 addr = hsotg->regs + GINTMSK;
616 dev_dbg(hsotg->dev, "GINTMSK @0x%08lX : 0x%08X\n",
617 (unsigned long)addr, dwc2_readl(addr));
618 addr = hsotg->regs + GRXSTSR;
619 dev_dbg(hsotg->dev, "GRXSTSR @0x%08lX : 0x%08X\n",
620 (unsigned long)addr, dwc2_readl(addr));
621 addr = hsotg->regs + GRXFSIZ;
622 dev_dbg(hsotg->dev, "GRXFSIZ @0x%08lX : 0x%08X\n",
623 (unsigned long)addr, dwc2_readl(addr));
624 addr = hsotg->regs + GNPTXFSIZ;
625 dev_dbg(hsotg->dev, "GNPTXFSIZ @0x%08lX : 0x%08X\n",
626 (unsigned long)addr, dwc2_readl(addr));
627 addr = hsotg->regs + GNPTXSTS;
628 dev_dbg(hsotg->dev, "GNPTXSTS @0x%08lX : 0x%08X\n",
629 (unsigned long)addr, dwc2_readl(addr));
630 addr = hsotg->regs + GI2CCTL;
631 dev_dbg(hsotg->dev, "GI2CCTL @0x%08lX : 0x%08X\n",
632 (unsigned long)addr, dwc2_readl(addr));
633 addr = hsotg->regs + GPVNDCTL;
634 dev_dbg(hsotg->dev, "GPVNDCTL @0x%08lX : 0x%08X\n",
635 (unsigned long)addr, dwc2_readl(addr));
636 addr = hsotg->regs + GGPIO;
637 dev_dbg(hsotg->dev, "GGPIO @0x%08lX : 0x%08X\n",
638 (unsigned long)addr, dwc2_readl(addr));
639 addr = hsotg->regs + GUID;
640 dev_dbg(hsotg->dev, "GUID @0x%08lX : 0x%08X\n",
641 (unsigned long)addr, dwc2_readl(addr));
642 addr = hsotg->regs + GSNPSID;
643 dev_dbg(hsotg->dev, "GSNPSID @0x%08lX : 0x%08X\n",
644 (unsigned long)addr, dwc2_readl(addr));
645 addr = hsotg->regs + GHWCFG1;
646 dev_dbg(hsotg->dev, "GHWCFG1 @0x%08lX : 0x%08X\n",
647 (unsigned long)addr, dwc2_readl(addr));
648 addr = hsotg->regs + GHWCFG2;
649 dev_dbg(hsotg->dev, "GHWCFG2 @0x%08lX : 0x%08X\n",
650 (unsigned long)addr, dwc2_readl(addr));
651 addr = hsotg->regs + GHWCFG3;
652 dev_dbg(hsotg->dev, "GHWCFG3 @0x%08lX : 0x%08X\n",
653 (unsigned long)addr, dwc2_readl(addr));
654 addr = hsotg->regs + GHWCFG4;
655 dev_dbg(hsotg->dev, "GHWCFG4 @0x%08lX : 0x%08X\n",
656 (unsigned long)addr, dwc2_readl(addr));
657 addr = hsotg->regs + GLPMCFG;
658 dev_dbg(hsotg->dev, "GLPMCFG @0x%08lX : 0x%08X\n",
659 (unsigned long)addr, dwc2_readl(addr));
660 addr = hsotg->regs + GPWRDN;
661 dev_dbg(hsotg->dev, "GPWRDN @0x%08lX : 0x%08X\n",
662 (unsigned long)addr, dwc2_readl(addr));
663 addr = hsotg->regs + GDFIFOCFG;
664 dev_dbg(hsotg->dev, "GDFIFOCFG @0x%08lX : 0x%08X\n",
665 (unsigned long)addr, dwc2_readl(addr));
666 addr = hsotg->regs + HPTXFSIZ;
667 dev_dbg(hsotg->dev, "HPTXFSIZ @0x%08lX : 0x%08X\n",
668 (unsigned long)addr, dwc2_readl(addr));
669
670 addr = hsotg->regs + PCGCTL;
671 dev_dbg(hsotg->dev, "PCGCTL @0x%08lX : 0x%08X\n",
672 (unsigned long)addr, dwc2_readl(addr));
673#endif
674}
675
676/**
677 * dwc2_flush_tx_fifo() - Flushes a Tx FIFO
678 *
679 * @hsotg: Programming view of DWC_otg controller
680 * @num: Tx FIFO to flush
681 */
682void dwc2_flush_tx_fifo(struct dwc2_hsotg *hsotg, const int num)
683{
684 u32 greset;
685 int count = 0;
686
687 dev_vdbg(hsotg->dev, "Flush Tx FIFO %d\n", num);
688
689 greset = GRSTCTL_TXFFLSH;
690 greset |= num << GRSTCTL_TXFNUM_SHIFT & GRSTCTL_TXFNUM_MASK;
691 dwc2_writel(greset, hsotg->regs + GRSTCTL);
692
693 do {
694 greset = dwc2_readl(hsotg->regs + GRSTCTL);
695 if (++count > 10000) {
696 dev_warn(hsotg->dev,
697 "%s() HANG! GRSTCTL=%0x GNPTXSTS=0x%08x\n",
698 __func__, greset,
699 dwc2_readl(hsotg->regs + GNPTXSTS));
700 break;
701 }
702 udelay(1);
703 } while (greset & GRSTCTL_TXFFLSH);
704
705 /* Wait for at least 3 PHY Clocks */
706 udelay(1);
707}
708
709/**
710 * dwc2_flush_rx_fifo() - Flushes the Rx FIFO
711 *
712 * @hsotg: Programming view of DWC_otg controller
713 */
714void dwc2_flush_rx_fifo(struct dwc2_hsotg *hsotg)
715{
716 u32 greset;
717 int count = 0;
718
719 dev_vdbg(hsotg->dev, "%s()\n", __func__);
720
721 greset = GRSTCTL_RXFFLSH;
722 dwc2_writel(greset, hsotg->regs + GRSTCTL);
723
724 do {
725 greset = dwc2_readl(hsotg->regs + GRSTCTL);
726 if (++count > 10000) {
727 dev_warn(hsotg->dev, "%s() HANG! GRSTCTL=%0x\n",
728 __func__, greset);
729 break;
730 }
731 udelay(1);
732 } while (greset & GRSTCTL_RXFFLSH);
733
734 /* Wait for at least 3 PHY Clocks */
735 udelay(1);
736}
737
738/*
739 * Forces either host or device mode if the controller is not
740 * currently in that mode.
741 *
742 * Returns true if the mode was forced.
743 */
744bool dwc2_force_mode_if_needed(struct dwc2_hsotg *hsotg, bool host)
745{
746 if (host && dwc2_is_host_mode(hsotg))
747 return false;
748 else if (!host && dwc2_is_device_mode(hsotg))
749 return false;
750
751 return dwc2_force_mode(hsotg, host);
752}
753
754u16 dwc2_get_otg_version(struct dwc2_hsotg *hsotg)
755{
756 return hsotg->params.otg_ver == 1 ? 0x0200 : 0x0103;
757}
758
759bool dwc2_is_controller_alive(struct dwc2_hsotg *hsotg)
760{
761 if (dwc2_readl(hsotg->regs + GSNPSID) == 0xffffffff)
762 return false;
763 else
764 return true;
765}
766
767/**
768 * dwc2_enable_global_interrupts() - Enables the controller's Global
769 * Interrupt in the AHB Config register
770 *
771 * @hsotg: Programming view of DWC_otg controller
772 */
773void dwc2_enable_global_interrupts(struct dwc2_hsotg *hsotg)
774{
775 u32 ahbcfg = dwc2_readl(hsotg->regs + GAHBCFG);
776
777 ahbcfg |= GAHBCFG_GLBL_INTR_EN;
778 dwc2_writel(ahbcfg, hsotg->regs + GAHBCFG);
779}
780
781/**
782 * dwc2_disable_global_interrupts() - Disables the controller's Global
783 * Interrupt in the AHB Config register
784 *
785 * @hsotg: Programming view of DWC_otg controller
786 */
787void dwc2_disable_global_interrupts(struct dwc2_hsotg *hsotg)
788{
789 u32 ahbcfg = dwc2_readl(hsotg->regs + GAHBCFG);
790
791 ahbcfg &= ~GAHBCFG_GLBL_INTR_EN;
792 dwc2_writel(ahbcfg, hsotg->regs + GAHBCFG);
793}
794
795/* Returns the controller's GHWCFG2.OTG_MODE. */
796unsigned dwc2_op_mode(struct dwc2_hsotg *hsotg)
797{
798 u32 ghwcfg2 = dwc2_readl(hsotg->regs + GHWCFG2);
799
800 return (ghwcfg2 & GHWCFG2_OP_MODE_MASK) >>
801 GHWCFG2_OP_MODE_SHIFT;
802}
803
804/* Returns true if the controller is capable of DRD. */
805bool dwc2_hw_is_otg(struct dwc2_hsotg *hsotg)
806{
807 unsigned op_mode = dwc2_op_mode(hsotg);
808
809 return (op_mode == GHWCFG2_OP_MODE_HNP_SRP_CAPABLE) ||
810 (op_mode == GHWCFG2_OP_MODE_SRP_ONLY_CAPABLE) ||
811 (op_mode == GHWCFG2_OP_MODE_NO_HNP_SRP_CAPABLE);
812}
813
814/* Returns true if the controller is host-only. */
815bool dwc2_hw_is_host(struct dwc2_hsotg *hsotg)
816{
817 unsigned op_mode = dwc2_op_mode(hsotg);
818
819 return (op_mode == GHWCFG2_OP_MODE_SRP_CAPABLE_HOST) ||
820 (op_mode == GHWCFG2_OP_MODE_NO_SRP_CAPABLE_HOST);
821}
822
823/* Returns true if the controller is device-only. */
824bool dwc2_hw_is_device(struct dwc2_hsotg *hsotg)
825{
826 unsigned op_mode = dwc2_op_mode(hsotg);
827
828 return (op_mode == GHWCFG2_OP_MODE_SRP_CAPABLE_DEVICE) ||
829 (op_mode == GHWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE);
830}
831
832MODULE_DESCRIPTION("DESIGNWARE HS OTG Core");
833MODULE_AUTHOR("Synopsys, Inc.");
834MODULE_LICENSE("Dual BSD/GPL");
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 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions, and the following disclaimer,
12 * without modification.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The names of the above-listed copyright holders may not be used
17 * to endorse or promote products derived from this software without
18 * specific prior written permission.
19 *
20 * ALTERNATIVELY, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") as published by the Free Software
22 * Foundation; either version 2 of the License, or (at your option) any
23 * later version.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
26 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
27 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
29 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
30 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
31 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
32 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38/*
39 * The Core code provides basic services for accessing and managing the
40 * DWC_otg hardware. These services are used by both the Host Controller
41 * Driver and the Peripheral Controller Driver.
42 */
43#include <linux/kernel.h>
44#include <linux/module.h>
45#include <linux/moduleparam.h>
46#include <linux/spinlock.h>
47#include <linux/interrupt.h>
48#include <linux/dma-mapping.h>
49#include <linux/delay.h>
50#include <linux/io.h>
51#include <linux/slab.h>
52#include <linux/usb.h>
53
54#include <linux/usb/hcd.h>
55#include <linux/usb/ch11.h>
56
57#include "core.h"
58#include "hcd.h"
59
60/**
61 * dwc2_backup_global_registers() - Backup global controller registers.
62 * When suspending usb bus, registers needs to be backuped
63 * if controller power is disabled once suspended.
64 *
65 * @hsotg: Programming view of the DWC_otg controller
66 */
67int dwc2_backup_global_registers(struct dwc2_hsotg *hsotg)
68{
69 struct dwc2_gregs_backup *gr;
70
71 dev_dbg(hsotg->dev, "%s\n", __func__);
72
73 /* Backup global regs */
74 gr = &hsotg->gr_backup;
75
76 gr->gotgctl = dwc2_readl(hsotg, GOTGCTL);
77 gr->gintmsk = dwc2_readl(hsotg, GINTMSK);
78 gr->gahbcfg = dwc2_readl(hsotg, GAHBCFG);
79 gr->gusbcfg = dwc2_readl(hsotg, GUSBCFG);
80 gr->grxfsiz = dwc2_readl(hsotg, GRXFSIZ);
81 gr->gnptxfsiz = dwc2_readl(hsotg, GNPTXFSIZ);
82 gr->gdfifocfg = dwc2_readl(hsotg, GDFIFOCFG);
83 gr->pcgcctl1 = dwc2_readl(hsotg, PCGCCTL1);
84 gr->glpmcfg = dwc2_readl(hsotg, GLPMCFG);
85 gr->gi2cctl = dwc2_readl(hsotg, GI2CCTL);
86 gr->pcgcctl = dwc2_readl(hsotg, PCGCTL);
87
88 gr->valid = true;
89 return 0;
90}
91
92/**
93 * dwc2_restore_global_registers() - Restore controller global registers.
94 * When resuming usb bus, device registers needs to be restored
95 * if controller power were disabled.
96 *
97 * @hsotg: Programming view of the DWC_otg controller
98 */
99int dwc2_restore_global_registers(struct dwc2_hsotg *hsotg)
100{
101 struct dwc2_gregs_backup *gr;
102
103 dev_dbg(hsotg->dev, "%s\n", __func__);
104
105 /* Restore global regs */
106 gr = &hsotg->gr_backup;
107 if (!gr->valid) {
108 dev_err(hsotg->dev, "%s: no global registers to restore\n",
109 __func__);
110 return -EINVAL;
111 }
112 gr->valid = false;
113
114 dwc2_writel(hsotg, 0xffffffff, GINTSTS);
115 dwc2_writel(hsotg, gr->gotgctl, GOTGCTL);
116 dwc2_writel(hsotg, gr->gintmsk, GINTMSK);
117 dwc2_writel(hsotg, gr->gusbcfg, GUSBCFG);
118 dwc2_writel(hsotg, gr->gahbcfg, GAHBCFG);
119 dwc2_writel(hsotg, gr->grxfsiz, GRXFSIZ);
120 dwc2_writel(hsotg, gr->gnptxfsiz, GNPTXFSIZ);
121 dwc2_writel(hsotg, gr->gdfifocfg, GDFIFOCFG);
122 dwc2_writel(hsotg, gr->pcgcctl1, PCGCCTL1);
123 dwc2_writel(hsotg, gr->glpmcfg, GLPMCFG);
124 dwc2_writel(hsotg, gr->pcgcctl, PCGCTL);
125 dwc2_writel(hsotg, gr->gi2cctl, GI2CCTL);
126
127 return 0;
128}
129
130/**
131 * dwc2_exit_partial_power_down() - Exit controller from Partial Power Down.
132 *
133 * @hsotg: Programming view of the DWC_otg controller
134 * @restore: Controller registers need to be restored
135 */
136int dwc2_exit_partial_power_down(struct dwc2_hsotg *hsotg, bool restore)
137{
138 u32 pcgcctl;
139 int ret = 0;
140
141 if (hsotg->params.power_down != DWC2_POWER_DOWN_PARAM_PARTIAL)
142 return -ENOTSUPP;
143
144 pcgcctl = dwc2_readl(hsotg, PCGCTL);
145 pcgcctl &= ~PCGCTL_STOPPCLK;
146 dwc2_writel(hsotg, pcgcctl, PCGCTL);
147
148 pcgcctl = dwc2_readl(hsotg, PCGCTL);
149 pcgcctl &= ~PCGCTL_PWRCLMP;
150 dwc2_writel(hsotg, pcgcctl, PCGCTL);
151
152 pcgcctl = dwc2_readl(hsotg, PCGCTL);
153 pcgcctl &= ~PCGCTL_RSTPDWNMODULE;
154 dwc2_writel(hsotg, pcgcctl, PCGCTL);
155
156 udelay(100);
157 if (restore) {
158 ret = dwc2_restore_global_registers(hsotg);
159 if (ret) {
160 dev_err(hsotg->dev, "%s: failed to restore registers\n",
161 __func__);
162 return ret;
163 }
164 if (dwc2_is_host_mode(hsotg)) {
165 ret = dwc2_restore_host_registers(hsotg);
166 if (ret) {
167 dev_err(hsotg->dev, "%s: failed to restore host registers\n",
168 __func__);
169 return ret;
170 }
171 } else {
172 ret = dwc2_restore_device_registers(hsotg, 0);
173 if (ret) {
174 dev_err(hsotg->dev, "%s: failed to restore device registers\n",
175 __func__);
176 return ret;
177 }
178 }
179 }
180
181 return ret;
182}
183
184/**
185 * dwc2_enter_partial_power_down() - Put controller in Partial Power Down.
186 *
187 * @hsotg: Programming view of the DWC_otg controller
188 */
189int dwc2_enter_partial_power_down(struct dwc2_hsotg *hsotg)
190{
191 u32 pcgcctl;
192 int ret = 0;
193
194 if (!hsotg->params.power_down)
195 return -ENOTSUPP;
196
197 /* Backup all registers */
198 ret = dwc2_backup_global_registers(hsotg);
199 if (ret) {
200 dev_err(hsotg->dev, "%s: failed to backup global registers\n",
201 __func__);
202 return ret;
203 }
204
205 if (dwc2_is_host_mode(hsotg)) {
206 ret = dwc2_backup_host_registers(hsotg);
207 if (ret) {
208 dev_err(hsotg->dev, "%s: failed to backup host registers\n",
209 __func__);
210 return ret;
211 }
212 } else {
213 ret = dwc2_backup_device_registers(hsotg);
214 if (ret) {
215 dev_err(hsotg->dev, "%s: failed to backup device registers\n",
216 __func__);
217 return ret;
218 }
219 }
220
221 /*
222 * Clear any pending interrupts since dwc2 will not be able to
223 * clear them after entering partial_power_down.
224 */
225 dwc2_writel(hsotg, 0xffffffff, GINTSTS);
226
227 /* Put the controller in low power state */
228 pcgcctl = dwc2_readl(hsotg, PCGCTL);
229
230 pcgcctl |= PCGCTL_PWRCLMP;
231 dwc2_writel(hsotg, pcgcctl, PCGCTL);
232 ndelay(20);
233
234 pcgcctl |= PCGCTL_RSTPDWNMODULE;
235 dwc2_writel(hsotg, pcgcctl, PCGCTL);
236 ndelay(20);
237
238 pcgcctl |= PCGCTL_STOPPCLK;
239 dwc2_writel(hsotg, pcgcctl, PCGCTL);
240
241 return ret;
242}
243
244/**
245 * dwc2_restore_essential_regs() - Restore essiential regs of core.
246 *
247 * @hsotg: Programming view of the DWC_otg controller
248 * @rmode: Restore mode, enabled in case of remote-wakeup.
249 * @is_host: Host or device mode.
250 */
251static void dwc2_restore_essential_regs(struct dwc2_hsotg *hsotg, int rmode,
252 int is_host)
253{
254 u32 pcgcctl;
255 struct dwc2_gregs_backup *gr;
256 struct dwc2_dregs_backup *dr;
257 struct dwc2_hregs_backup *hr;
258
259 gr = &hsotg->gr_backup;
260 dr = &hsotg->dr_backup;
261 hr = &hsotg->hr_backup;
262
263 dev_dbg(hsotg->dev, "%s: restoring essential regs\n", __func__);
264
265 /* Load restore values for [31:14] bits */
266 pcgcctl = (gr->pcgcctl & 0xffffc000);
267 /* If High Speed */
268 if (is_host) {
269 if (!(pcgcctl & PCGCTL_P2HD_PRT_SPD_MASK))
270 pcgcctl |= BIT(17);
271 } else {
272 if (!(pcgcctl & PCGCTL_P2HD_DEV_ENUM_SPD_MASK))
273 pcgcctl |= BIT(17);
274 }
275 dwc2_writel(hsotg, pcgcctl, PCGCTL);
276
277 /* Umnask global Interrupt in GAHBCFG and restore it */
278 dwc2_writel(hsotg, gr->gahbcfg | GAHBCFG_GLBL_INTR_EN, GAHBCFG);
279
280 /* Clear all pending interupts */
281 dwc2_writel(hsotg, 0xffffffff, GINTSTS);
282
283 /* Unmask restore done interrupt */
284 dwc2_writel(hsotg, GINTSTS_RESTOREDONE, GINTMSK);
285
286 /* Restore GUSBCFG and HCFG/DCFG */
287 dwc2_writel(hsotg, gr->gusbcfg, GUSBCFG);
288
289 if (is_host) {
290 dwc2_writel(hsotg, hr->hcfg, HCFG);
291 if (rmode)
292 pcgcctl |= PCGCTL_RESTOREMODE;
293 dwc2_writel(hsotg, pcgcctl, PCGCTL);
294 udelay(10);
295
296 pcgcctl |= PCGCTL_ESS_REG_RESTORED;
297 dwc2_writel(hsotg, pcgcctl, PCGCTL);
298 udelay(10);
299 } else {
300 dwc2_writel(hsotg, dr->dcfg, DCFG);
301 if (!rmode)
302 pcgcctl |= PCGCTL_RESTOREMODE | PCGCTL_RSTPDWNMODULE;
303 dwc2_writel(hsotg, pcgcctl, PCGCTL);
304 udelay(10);
305
306 pcgcctl |= PCGCTL_ESS_REG_RESTORED;
307 dwc2_writel(hsotg, pcgcctl, PCGCTL);
308 udelay(10);
309 }
310}
311
312/**
313 * dwc2_hib_restore_common() - Common part of restore routine.
314 *
315 * @hsotg: Programming view of the DWC_otg controller
316 * @rem_wakeup: Remote-wakeup, enabled in case of remote-wakeup.
317 * @is_host: Host or device mode.
318 */
319void dwc2_hib_restore_common(struct dwc2_hsotg *hsotg, int rem_wakeup,
320 int is_host)
321{
322 u32 gpwrdn;
323
324 /* Switch-on voltage to the core */
325 gpwrdn = dwc2_readl(hsotg, GPWRDN);
326 gpwrdn &= ~GPWRDN_PWRDNSWTCH;
327 dwc2_writel(hsotg, gpwrdn, GPWRDN);
328 udelay(10);
329
330 /* Reset core */
331 gpwrdn = dwc2_readl(hsotg, GPWRDN);
332 gpwrdn &= ~GPWRDN_PWRDNRSTN;
333 dwc2_writel(hsotg, gpwrdn, GPWRDN);
334 udelay(10);
335
336 /* Enable restore from PMU */
337 gpwrdn = dwc2_readl(hsotg, GPWRDN);
338 gpwrdn |= GPWRDN_RESTORE;
339 dwc2_writel(hsotg, gpwrdn, GPWRDN);
340 udelay(10);
341
342 /* Disable Power Down Clamp */
343 gpwrdn = dwc2_readl(hsotg, GPWRDN);
344 gpwrdn &= ~GPWRDN_PWRDNCLMP;
345 dwc2_writel(hsotg, gpwrdn, GPWRDN);
346 udelay(50);
347
348 if (!is_host && rem_wakeup)
349 udelay(70);
350
351 /* Deassert reset core */
352 gpwrdn = dwc2_readl(hsotg, GPWRDN);
353 gpwrdn |= GPWRDN_PWRDNRSTN;
354 dwc2_writel(hsotg, gpwrdn, GPWRDN);
355 udelay(10);
356
357 /* Disable PMU interrupt */
358 gpwrdn = dwc2_readl(hsotg, GPWRDN);
359 gpwrdn &= ~GPWRDN_PMUINTSEL;
360 dwc2_writel(hsotg, gpwrdn, GPWRDN);
361 udelay(10);
362
363 /* Set Restore Essential Regs bit in PCGCCTL register */
364 dwc2_restore_essential_regs(hsotg, rem_wakeup, is_host);
365
366 /*
367 * Wait For Restore_done Interrupt. This mechanism of polling the
368 * interrupt is introduced to avoid any possible race conditions
369 */
370 if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS, GINTSTS_RESTOREDONE,
371 20000)) {
372 dev_dbg(hsotg->dev,
373 "%s: Restore Done wan't generated here\n",
374 __func__);
375 } else {
376 dev_dbg(hsotg->dev, "restore done generated here\n");
377 }
378}
379
380/**
381 * dwc2_wait_for_mode() - Waits for the controller mode.
382 * @hsotg: Programming view of the DWC_otg controller.
383 * @host_mode: If true, waits for host mode, otherwise device mode.
384 */
385static void dwc2_wait_for_mode(struct dwc2_hsotg *hsotg,
386 bool host_mode)
387{
388 ktime_t start;
389 ktime_t end;
390 unsigned int timeout = 110;
391
392 dev_vdbg(hsotg->dev, "Waiting for %s mode\n",
393 host_mode ? "host" : "device");
394
395 start = ktime_get();
396
397 while (1) {
398 s64 ms;
399
400 if (dwc2_is_host_mode(hsotg) == host_mode) {
401 dev_vdbg(hsotg->dev, "%s mode set\n",
402 host_mode ? "Host" : "Device");
403 break;
404 }
405
406 end = ktime_get();
407 ms = ktime_to_ms(ktime_sub(end, start));
408
409 if (ms >= (s64)timeout) {
410 dev_warn(hsotg->dev, "%s: Couldn't set %s mode\n",
411 __func__, host_mode ? "host" : "device");
412 break;
413 }
414
415 usleep_range(1000, 2000);
416 }
417}
418
419/**
420 * dwc2_iddig_filter_enabled() - Returns true if the IDDIG debounce
421 * filter is enabled.
422 *
423 * @hsotg: Programming view of DWC_otg controller
424 */
425static bool dwc2_iddig_filter_enabled(struct dwc2_hsotg *hsotg)
426{
427 u32 gsnpsid;
428 u32 ghwcfg4;
429
430 if (!dwc2_hw_is_otg(hsotg))
431 return false;
432
433 /* Check if core configuration includes the IDDIG filter. */
434 ghwcfg4 = dwc2_readl(hsotg, GHWCFG4);
435 if (!(ghwcfg4 & GHWCFG4_IDDIG_FILT_EN))
436 return false;
437
438 /*
439 * Check if the IDDIG debounce filter is bypassed. Available
440 * in core version >= 3.10a.
441 */
442 gsnpsid = dwc2_readl(hsotg, GSNPSID);
443 if (gsnpsid >= DWC2_CORE_REV_3_10a) {
444 u32 gotgctl = dwc2_readl(hsotg, GOTGCTL);
445
446 if (gotgctl & GOTGCTL_DBNCE_FLTR_BYPASS)
447 return false;
448 }
449
450 return true;
451}
452
453/*
454 * dwc2_enter_hibernation() - Common function to enter hibernation.
455 *
456 * @hsotg: Programming view of the DWC_otg controller
457 * @is_host: True if core is in host mode.
458 *
459 * Return: 0 if successful, negative error code otherwise
460 */
461int dwc2_enter_hibernation(struct dwc2_hsotg *hsotg, int is_host)
462{
463 if (hsotg->params.power_down != DWC2_POWER_DOWN_PARAM_HIBERNATION)
464 return -ENOTSUPP;
465
466 if (is_host)
467 return dwc2_host_enter_hibernation(hsotg);
468 else
469 return dwc2_gadget_enter_hibernation(hsotg);
470}
471
472/*
473 * dwc2_exit_hibernation() - Common function to exit from hibernation.
474 *
475 * @hsotg: Programming view of the DWC_otg controller
476 * @rem_wakeup: Remote-wakeup, enabled in case of remote-wakeup.
477 * @reset: Enabled in case of restore with reset.
478 * @is_host: True if core is in host mode.
479 *
480 * Return: 0 if successful, negative error code otherwise
481 */
482int dwc2_exit_hibernation(struct dwc2_hsotg *hsotg, int rem_wakeup,
483 int reset, int is_host)
484{
485 if (is_host)
486 return dwc2_host_exit_hibernation(hsotg, rem_wakeup, reset);
487 else
488 return dwc2_gadget_exit_hibernation(hsotg, rem_wakeup, reset);
489}
490
491/*
492 * Do core a soft reset of the core. Be careful with this because it
493 * resets all the internal state machines of the core.
494 */
495int dwc2_core_reset(struct dwc2_hsotg *hsotg, bool skip_wait)
496{
497 u32 greset;
498 bool wait_for_host_mode = false;
499
500 dev_vdbg(hsotg->dev, "%s()\n", __func__);
501
502 /*
503 * If the current mode is host, either due to the force mode
504 * bit being set (which persists after core reset) or the
505 * connector id pin, a core soft reset will temporarily reset
506 * the mode to device. A delay from the IDDIG debounce filter
507 * will occur before going back to host mode.
508 *
509 * Determine whether we will go back into host mode after a
510 * reset and account for this delay after the reset.
511 */
512 if (dwc2_iddig_filter_enabled(hsotg)) {
513 u32 gotgctl = dwc2_readl(hsotg, GOTGCTL);
514 u32 gusbcfg = dwc2_readl(hsotg, GUSBCFG);
515
516 if (!(gotgctl & GOTGCTL_CONID_B) ||
517 (gusbcfg & GUSBCFG_FORCEHOSTMODE)) {
518 wait_for_host_mode = true;
519 }
520 }
521
522 /* Core Soft Reset */
523 greset = dwc2_readl(hsotg, GRSTCTL);
524 greset |= GRSTCTL_CSFTRST;
525 dwc2_writel(hsotg, greset, GRSTCTL);
526
527 if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_CSFTRST, 50)) {
528 dev_warn(hsotg->dev, "%s: HANG! Soft Reset timeout GRSTCTL GRSTCTL_CSFTRST\n",
529 __func__);
530 return -EBUSY;
531 }
532
533 /* Wait for AHB master IDLE state */
534 if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, GRSTCTL_AHBIDLE, 10000)) {
535 dev_warn(hsotg->dev, "%s: HANG! AHB Idle timeout GRSTCTL GRSTCTL_AHBIDLE\n",
536 __func__);
537 return -EBUSY;
538 }
539
540 if (wait_for_host_mode && !skip_wait)
541 dwc2_wait_for_mode(hsotg, true);
542
543 return 0;
544}
545
546/**
547 * dwc2_force_mode() - Force the mode of the controller.
548 *
549 * Forcing the mode is needed for two cases:
550 *
551 * 1) If the dr_mode is set to either HOST or PERIPHERAL we force the
552 * controller to stay in a particular mode regardless of ID pin
553 * changes. We do this once during probe.
554 *
555 * 2) During probe we want to read reset values of the hw
556 * configuration registers that are only available in either host or
557 * device mode. We may need to force the mode if the current mode does
558 * not allow us to access the register in the mode that we want.
559 *
560 * In either case it only makes sense to force the mode if the
561 * controller hardware is OTG capable.
562 *
563 * Checks are done in this function to determine whether doing a force
564 * would be valid or not.
565 *
566 * If a force is done, it requires a IDDIG debounce filter delay if
567 * the filter is configured and enabled. We poll the current mode of
568 * the controller to account for this delay.
569 *
570 * @hsotg: Programming view of DWC_otg controller
571 * @host: Host mode flag
572 */
573void dwc2_force_mode(struct dwc2_hsotg *hsotg, bool host)
574{
575 u32 gusbcfg;
576 u32 set;
577 u32 clear;
578
579 dev_dbg(hsotg->dev, "Forcing mode to %s\n", host ? "host" : "device");
580
581 /*
582 * Force mode has no effect if the hardware is not OTG.
583 */
584 if (!dwc2_hw_is_otg(hsotg))
585 return;
586
587 /*
588 * If dr_mode is either peripheral or host only, there is no
589 * need to ever force the mode to the opposite mode.
590 */
591 if (WARN_ON(host && hsotg->dr_mode == USB_DR_MODE_PERIPHERAL))
592 return;
593
594 if (WARN_ON(!host && hsotg->dr_mode == USB_DR_MODE_HOST))
595 return;
596
597 gusbcfg = dwc2_readl(hsotg, GUSBCFG);
598
599 set = host ? GUSBCFG_FORCEHOSTMODE : GUSBCFG_FORCEDEVMODE;
600 clear = host ? GUSBCFG_FORCEDEVMODE : GUSBCFG_FORCEHOSTMODE;
601
602 gusbcfg &= ~clear;
603 gusbcfg |= set;
604 dwc2_writel(hsotg, gusbcfg, GUSBCFG);
605
606 dwc2_wait_for_mode(hsotg, host);
607 return;
608}
609
610/**
611 * dwc2_clear_force_mode() - Clears the force mode bits.
612 *
613 * After clearing the bits, wait up to 100 ms to account for any
614 * potential IDDIG filter delay. We can't know if we expect this delay
615 * or not because the value of the connector ID status is affected by
616 * the force mode. We only need to call this once during probe if
617 * dr_mode == OTG.
618 *
619 * @hsotg: Programming view of DWC_otg controller
620 */
621static void dwc2_clear_force_mode(struct dwc2_hsotg *hsotg)
622{
623 u32 gusbcfg;
624
625 if (!dwc2_hw_is_otg(hsotg))
626 return;
627
628 dev_dbg(hsotg->dev, "Clearing force mode bits\n");
629
630 gusbcfg = dwc2_readl(hsotg, GUSBCFG);
631 gusbcfg &= ~GUSBCFG_FORCEHOSTMODE;
632 gusbcfg &= ~GUSBCFG_FORCEDEVMODE;
633 dwc2_writel(hsotg, gusbcfg, GUSBCFG);
634
635 if (dwc2_iddig_filter_enabled(hsotg))
636 msleep(100);
637}
638
639/*
640 * Sets or clears force mode based on the dr_mode parameter.
641 */
642void dwc2_force_dr_mode(struct dwc2_hsotg *hsotg)
643{
644 switch (hsotg->dr_mode) {
645 case USB_DR_MODE_HOST:
646 /*
647 * NOTE: This is required for some rockchip soc based
648 * platforms on their host-only dwc2.
649 */
650 if (!dwc2_hw_is_otg(hsotg))
651 msleep(50);
652
653 break;
654 case USB_DR_MODE_PERIPHERAL:
655 dwc2_force_mode(hsotg, false);
656 break;
657 case USB_DR_MODE_OTG:
658 dwc2_clear_force_mode(hsotg);
659 break;
660 default:
661 dev_warn(hsotg->dev, "%s() Invalid dr_mode=%d\n",
662 __func__, hsotg->dr_mode);
663 break;
664 }
665}
666
667/*
668 * dwc2_enable_acg - enable active clock gating feature
669 */
670void dwc2_enable_acg(struct dwc2_hsotg *hsotg)
671{
672 if (hsotg->params.acg_enable) {
673 u32 pcgcctl1 = dwc2_readl(hsotg, PCGCCTL1);
674
675 dev_dbg(hsotg->dev, "Enabling Active Clock Gating\n");
676 pcgcctl1 |= PCGCCTL1_GATEEN;
677 dwc2_writel(hsotg, pcgcctl1, PCGCCTL1);
678 }
679}
680
681/**
682 * dwc2_dump_host_registers() - Prints the host registers
683 *
684 * @hsotg: Programming view of DWC_otg controller
685 *
686 * NOTE: This function will be removed once the peripheral controller code
687 * is integrated and the driver is stable
688 */
689void dwc2_dump_host_registers(struct dwc2_hsotg *hsotg)
690{
691#ifdef DEBUG
692 u32 __iomem *addr;
693 int i;
694
695 dev_dbg(hsotg->dev, "Host Global Registers\n");
696 addr = hsotg->regs + HCFG;
697 dev_dbg(hsotg->dev, "HCFG @0x%08lX : 0x%08X\n",
698 (unsigned long)addr, dwc2_readl(hsotg, HCFG));
699 addr = hsotg->regs + HFIR;
700 dev_dbg(hsotg->dev, "HFIR @0x%08lX : 0x%08X\n",
701 (unsigned long)addr, dwc2_readl(hsotg, HFIR));
702 addr = hsotg->regs + HFNUM;
703 dev_dbg(hsotg->dev, "HFNUM @0x%08lX : 0x%08X\n",
704 (unsigned long)addr, dwc2_readl(hsotg, HFNUM));
705 addr = hsotg->regs + HPTXSTS;
706 dev_dbg(hsotg->dev, "HPTXSTS @0x%08lX : 0x%08X\n",
707 (unsigned long)addr, dwc2_readl(hsotg, HPTXSTS));
708 addr = hsotg->regs + HAINT;
709 dev_dbg(hsotg->dev, "HAINT @0x%08lX : 0x%08X\n",
710 (unsigned long)addr, dwc2_readl(hsotg, HAINT));
711 addr = hsotg->regs + HAINTMSK;
712 dev_dbg(hsotg->dev, "HAINTMSK @0x%08lX : 0x%08X\n",
713 (unsigned long)addr, dwc2_readl(hsotg, HAINTMSK));
714 if (hsotg->params.dma_desc_enable) {
715 addr = hsotg->regs + HFLBADDR;
716 dev_dbg(hsotg->dev, "HFLBADDR @0x%08lX : 0x%08X\n",
717 (unsigned long)addr, dwc2_readl(hsotg, HFLBADDR));
718 }
719
720 addr = hsotg->regs + HPRT0;
721 dev_dbg(hsotg->dev, "HPRT0 @0x%08lX : 0x%08X\n",
722 (unsigned long)addr, dwc2_readl(hsotg, HPRT0));
723
724 for (i = 0; i < hsotg->params.host_channels; i++) {
725 dev_dbg(hsotg->dev, "Host Channel %d Specific Registers\n", i);
726 addr = hsotg->regs + HCCHAR(i);
727 dev_dbg(hsotg->dev, "HCCHAR @0x%08lX : 0x%08X\n",
728 (unsigned long)addr, dwc2_readl(hsotg, HCCHAR(i)));
729 addr = hsotg->regs + HCSPLT(i);
730 dev_dbg(hsotg->dev, "HCSPLT @0x%08lX : 0x%08X\n",
731 (unsigned long)addr, dwc2_readl(hsotg, HCSPLT(i)));
732 addr = hsotg->regs + HCINT(i);
733 dev_dbg(hsotg->dev, "HCINT @0x%08lX : 0x%08X\n",
734 (unsigned long)addr, dwc2_readl(hsotg, HCINT(i)));
735 addr = hsotg->regs + HCINTMSK(i);
736 dev_dbg(hsotg->dev, "HCINTMSK @0x%08lX : 0x%08X\n",
737 (unsigned long)addr, dwc2_readl(hsotg, HCINTMSK(i)));
738 addr = hsotg->regs + HCTSIZ(i);
739 dev_dbg(hsotg->dev, "HCTSIZ @0x%08lX : 0x%08X\n",
740 (unsigned long)addr, dwc2_readl(hsotg, HCTSIZ(i)));
741 addr = hsotg->regs + HCDMA(i);
742 dev_dbg(hsotg->dev, "HCDMA @0x%08lX : 0x%08X\n",
743 (unsigned long)addr, dwc2_readl(hsotg, HCDMA(i)));
744 if (hsotg->params.dma_desc_enable) {
745 addr = hsotg->regs + HCDMAB(i);
746 dev_dbg(hsotg->dev, "HCDMAB @0x%08lX : 0x%08X\n",
747 (unsigned long)addr, dwc2_readl(hsotg,
748 HCDMAB(i)));
749 }
750 }
751#endif
752}
753
754/**
755 * dwc2_dump_global_registers() - Prints the core global registers
756 *
757 * @hsotg: Programming view of DWC_otg controller
758 *
759 * NOTE: This function will be removed once the peripheral controller code
760 * is integrated and the driver is stable
761 */
762void dwc2_dump_global_registers(struct dwc2_hsotg *hsotg)
763{
764#ifdef DEBUG
765 u32 __iomem *addr;
766
767 dev_dbg(hsotg->dev, "Core Global Registers\n");
768 addr = hsotg->regs + GOTGCTL;
769 dev_dbg(hsotg->dev, "GOTGCTL @0x%08lX : 0x%08X\n",
770 (unsigned long)addr, dwc2_readl(hsotg, GOTGCTL));
771 addr = hsotg->regs + GOTGINT;
772 dev_dbg(hsotg->dev, "GOTGINT @0x%08lX : 0x%08X\n",
773 (unsigned long)addr, dwc2_readl(hsotg, GOTGINT));
774 addr = hsotg->regs + GAHBCFG;
775 dev_dbg(hsotg->dev, "GAHBCFG @0x%08lX : 0x%08X\n",
776 (unsigned long)addr, dwc2_readl(hsotg, GAHBCFG));
777 addr = hsotg->regs + GUSBCFG;
778 dev_dbg(hsotg->dev, "GUSBCFG @0x%08lX : 0x%08X\n",
779 (unsigned long)addr, dwc2_readl(hsotg, GUSBCFG));
780 addr = hsotg->regs + GRSTCTL;
781 dev_dbg(hsotg->dev, "GRSTCTL @0x%08lX : 0x%08X\n",
782 (unsigned long)addr, dwc2_readl(hsotg, GRSTCTL));
783 addr = hsotg->regs + GINTSTS;
784 dev_dbg(hsotg->dev, "GINTSTS @0x%08lX : 0x%08X\n",
785 (unsigned long)addr, dwc2_readl(hsotg, GINTSTS));
786 addr = hsotg->regs + GINTMSK;
787 dev_dbg(hsotg->dev, "GINTMSK @0x%08lX : 0x%08X\n",
788 (unsigned long)addr, dwc2_readl(hsotg, GINTMSK));
789 addr = hsotg->regs + GRXSTSR;
790 dev_dbg(hsotg->dev, "GRXSTSR @0x%08lX : 0x%08X\n",
791 (unsigned long)addr, dwc2_readl(hsotg, GRXSTSR));
792 addr = hsotg->regs + GRXFSIZ;
793 dev_dbg(hsotg->dev, "GRXFSIZ @0x%08lX : 0x%08X\n",
794 (unsigned long)addr, dwc2_readl(hsotg, GRXFSIZ));
795 addr = hsotg->regs + GNPTXFSIZ;
796 dev_dbg(hsotg->dev, "GNPTXFSIZ @0x%08lX : 0x%08X\n",
797 (unsigned long)addr, dwc2_readl(hsotg, GNPTXFSIZ));
798 addr = hsotg->regs + GNPTXSTS;
799 dev_dbg(hsotg->dev, "GNPTXSTS @0x%08lX : 0x%08X\n",
800 (unsigned long)addr, dwc2_readl(hsotg, GNPTXSTS));
801 addr = hsotg->regs + GI2CCTL;
802 dev_dbg(hsotg->dev, "GI2CCTL @0x%08lX : 0x%08X\n",
803 (unsigned long)addr, dwc2_readl(hsotg, GI2CCTL));
804 addr = hsotg->regs + GPVNDCTL;
805 dev_dbg(hsotg->dev, "GPVNDCTL @0x%08lX : 0x%08X\n",
806 (unsigned long)addr, dwc2_readl(hsotg, GPVNDCTL));
807 addr = hsotg->regs + GGPIO;
808 dev_dbg(hsotg->dev, "GGPIO @0x%08lX : 0x%08X\n",
809 (unsigned long)addr, dwc2_readl(hsotg, GGPIO));
810 addr = hsotg->regs + GUID;
811 dev_dbg(hsotg->dev, "GUID @0x%08lX : 0x%08X\n",
812 (unsigned long)addr, dwc2_readl(hsotg, GUID));
813 addr = hsotg->regs + GSNPSID;
814 dev_dbg(hsotg->dev, "GSNPSID @0x%08lX : 0x%08X\n",
815 (unsigned long)addr, dwc2_readl(hsotg, GSNPSID));
816 addr = hsotg->regs + GHWCFG1;
817 dev_dbg(hsotg->dev, "GHWCFG1 @0x%08lX : 0x%08X\n",
818 (unsigned long)addr, dwc2_readl(hsotg, GHWCFG1));
819 addr = hsotg->regs + GHWCFG2;
820 dev_dbg(hsotg->dev, "GHWCFG2 @0x%08lX : 0x%08X\n",
821 (unsigned long)addr, dwc2_readl(hsotg, GHWCFG2));
822 addr = hsotg->regs + GHWCFG3;
823 dev_dbg(hsotg->dev, "GHWCFG3 @0x%08lX : 0x%08X\n",
824 (unsigned long)addr, dwc2_readl(hsotg, GHWCFG3));
825 addr = hsotg->regs + GHWCFG4;
826 dev_dbg(hsotg->dev, "GHWCFG4 @0x%08lX : 0x%08X\n",
827 (unsigned long)addr, dwc2_readl(hsotg, GHWCFG4));
828 addr = hsotg->regs + GLPMCFG;
829 dev_dbg(hsotg->dev, "GLPMCFG @0x%08lX : 0x%08X\n",
830 (unsigned long)addr, dwc2_readl(hsotg, GLPMCFG));
831 addr = hsotg->regs + GPWRDN;
832 dev_dbg(hsotg->dev, "GPWRDN @0x%08lX : 0x%08X\n",
833 (unsigned long)addr, dwc2_readl(hsotg, GPWRDN));
834 addr = hsotg->regs + GDFIFOCFG;
835 dev_dbg(hsotg->dev, "GDFIFOCFG @0x%08lX : 0x%08X\n",
836 (unsigned long)addr, dwc2_readl(hsotg, GDFIFOCFG));
837 addr = hsotg->regs + HPTXFSIZ;
838 dev_dbg(hsotg->dev, "HPTXFSIZ @0x%08lX : 0x%08X\n",
839 (unsigned long)addr, dwc2_readl(hsotg, HPTXFSIZ));
840
841 addr = hsotg->regs + PCGCTL;
842 dev_dbg(hsotg->dev, "PCGCTL @0x%08lX : 0x%08X\n",
843 (unsigned long)addr, dwc2_readl(hsotg, PCGCTL));
844#endif
845}
846
847/**
848 * dwc2_flush_tx_fifo() - Flushes a Tx FIFO
849 *
850 * @hsotg: Programming view of DWC_otg controller
851 * @num: Tx FIFO to flush
852 */
853void dwc2_flush_tx_fifo(struct dwc2_hsotg *hsotg, const int num)
854{
855 u32 greset;
856
857 dev_vdbg(hsotg->dev, "Flush Tx FIFO %d\n", num);
858
859 /* Wait for AHB master IDLE state */
860 if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, GRSTCTL_AHBIDLE, 10000))
861 dev_warn(hsotg->dev, "%s: HANG! AHB Idle GRSCTL\n",
862 __func__);
863
864 greset = GRSTCTL_TXFFLSH;
865 greset |= num << GRSTCTL_TXFNUM_SHIFT & GRSTCTL_TXFNUM_MASK;
866 dwc2_writel(hsotg, greset, GRSTCTL);
867
868 if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_TXFFLSH, 10000))
869 dev_warn(hsotg->dev, "%s: HANG! timeout GRSTCTL GRSTCTL_TXFFLSH\n",
870 __func__);
871
872 /* Wait for at least 3 PHY Clocks */
873 udelay(1);
874}
875
876/**
877 * dwc2_flush_rx_fifo() - Flushes the Rx FIFO
878 *
879 * @hsotg: Programming view of DWC_otg controller
880 */
881void dwc2_flush_rx_fifo(struct dwc2_hsotg *hsotg)
882{
883 u32 greset;
884
885 dev_vdbg(hsotg->dev, "%s()\n", __func__);
886
887 /* Wait for AHB master IDLE state */
888 if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, GRSTCTL_AHBIDLE, 10000))
889 dev_warn(hsotg->dev, "%s: HANG! AHB Idle GRSCTL\n",
890 __func__);
891
892 greset = GRSTCTL_RXFFLSH;
893 dwc2_writel(hsotg, greset, GRSTCTL);
894
895 /* Wait for RxFIFO flush done */
896 if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_RXFFLSH, 10000))
897 dev_warn(hsotg->dev, "%s: HANG! timeout GRSTCTL GRSTCTL_RXFFLSH\n",
898 __func__);
899
900 /* Wait for at least 3 PHY Clocks */
901 udelay(1);
902}
903
904bool dwc2_is_controller_alive(struct dwc2_hsotg *hsotg)
905{
906 if (dwc2_readl(hsotg, GSNPSID) == 0xffffffff)
907 return false;
908 else
909 return true;
910}
911
912/**
913 * dwc2_enable_global_interrupts() - Enables the controller's Global
914 * Interrupt in the AHB Config register
915 *
916 * @hsotg: Programming view of DWC_otg controller
917 */
918void dwc2_enable_global_interrupts(struct dwc2_hsotg *hsotg)
919{
920 u32 ahbcfg = dwc2_readl(hsotg, GAHBCFG);
921
922 ahbcfg |= GAHBCFG_GLBL_INTR_EN;
923 dwc2_writel(hsotg, ahbcfg, GAHBCFG);
924}
925
926/**
927 * dwc2_disable_global_interrupts() - Disables the controller's Global
928 * Interrupt in the AHB Config register
929 *
930 * @hsotg: Programming view of DWC_otg controller
931 */
932void dwc2_disable_global_interrupts(struct dwc2_hsotg *hsotg)
933{
934 u32 ahbcfg = dwc2_readl(hsotg, GAHBCFG);
935
936 ahbcfg &= ~GAHBCFG_GLBL_INTR_EN;
937 dwc2_writel(hsotg, ahbcfg, GAHBCFG);
938}
939
940/* Returns the controller's GHWCFG2.OTG_MODE. */
941unsigned int dwc2_op_mode(struct dwc2_hsotg *hsotg)
942{
943 u32 ghwcfg2 = dwc2_readl(hsotg, GHWCFG2);
944
945 return (ghwcfg2 & GHWCFG2_OP_MODE_MASK) >>
946 GHWCFG2_OP_MODE_SHIFT;
947}
948
949/* Returns true if the controller is capable of DRD. */
950bool dwc2_hw_is_otg(struct dwc2_hsotg *hsotg)
951{
952 unsigned int op_mode = dwc2_op_mode(hsotg);
953
954 return (op_mode == GHWCFG2_OP_MODE_HNP_SRP_CAPABLE) ||
955 (op_mode == GHWCFG2_OP_MODE_SRP_ONLY_CAPABLE) ||
956 (op_mode == GHWCFG2_OP_MODE_NO_HNP_SRP_CAPABLE);
957}
958
959/* Returns true if the controller is host-only. */
960bool dwc2_hw_is_host(struct dwc2_hsotg *hsotg)
961{
962 unsigned int op_mode = dwc2_op_mode(hsotg);
963
964 return (op_mode == GHWCFG2_OP_MODE_SRP_CAPABLE_HOST) ||
965 (op_mode == GHWCFG2_OP_MODE_NO_SRP_CAPABLE_HOST);
966}
967
968/* Returns true if the controller is device-only. */
969bool dwc2_hw_is_device(struct dwc2_hsotg *hsotg)
970{
971 unsigned int op_mode = dwc2_op_mode(hsotg);
972
973 return (op_mode == GHWCFG2_OP_MODE_SRP_CAPABLE_DEVICE) ||
974 (op_mode == GHWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE);
975}
976
977/**
978 * dwc2_hsotg_wait_bit_set - Waits for bit to be set.
979 * @hsotg: Programming view of DWC_otg controller.
980 * @offset: Register's offset where bit/bits must be set.
981 * @mask: Mask of the bit/bits which must be set.
982 * @timeout: Timeout to wait.
983 *
984 * Return: 0 if bit/bits are set or -ETIMEDOUT in case of timeout.
985 */
986int dwc2_hsotg_wait_bit_set(struct dwc2_hsotg *hsotg, u32 offset, u32 mask,
987 u32 timeout)
988{
989 u32 i;
990
991 for (i = 0; i < timeout; i++) {
992 if (dwc2_readl(hsotg, offset) & mask)
993 return 0;
994 udelay(1);
995 }
996
997 return -ETIMEDOUT;
998}
999
1000/**
1001 * dwc2_hsotg_wait_bit_clear - Waits for bit to be clear.
1002 * @hsotg: Programming view of DWC_otg controller.
1003 * @offset: Register's offset where bit/bits must be set.
1004 * @mask: Mask of the bit/bits which must be set.
1005 * @timeout: Timeout to wait.
1006 *
1007 * Return: 0 if bit/bits are set or -ETIMEDOUT in case of timeout.
1008 */
1009int dwc2_hsotg_wait_bit_clear(struct dwc2_hsotg *hsotg, u32 offset, u32 mask,
1010 u32 timeout)
1011{
1012 u32 i;
1013
1014 for (i = 0; i < timeout; i++) {
1015 if (!(dwc2_readl(hsotg, offset) & mask))
1016 return 0;
1017 udelay(1);
1018 }
1019
1020 return -ETIMEDOUT;
1021}
1022
1023/*
1024 * Initializes the FSLSPClkSel field of the HCFG register depending on the
1025 * PHY type
1026 */
1027void dwc2_init_fs_ls_pclk_sel(struct dwc2_hsotg *hsotg)
1028{
1029 u32 hcfg, val;
1030
1031 if ((hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_ULPI &&
1032 hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED &&
1033 hsotg->params.ulpi_fs_ls) ||
1034 hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS) {
1035 /* Full speed PHY */
1036 val = HCFG_FSLSPCLKSEL_48_MHZ;
1037 } else {
1038 /* High speed PHY running at full speed or high speed */
1039 val = HCFG_FSLSPCLKSEL_30_60_MHZ;
1040 }
1041
1042 dev_dbg(hsotg->dev, "Initializing HCFG.FSLSPClkSel to %08x\n", val);
1043 hcfg = dwc2_readl(hsotg, HCFG);
1044 hcfg &= ~HCFG_FSLSPCLKSEL_MASK;
1045 hcfg |= val << HCFG_FSLSPCLKSEL_SHIFT;
1046 dwc2_writel(hsotg, hcfg, HCFG);
1047}
1048
1049static int dwc2_fs_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
1050{
1051 u32 usbcfg, ggpio, i2cctl;
1052 int retval = 0;
1053
1054 /*
1055 * core_init() is now called on every switch so only call the
1056 * following for the first time through
1057 */
1058 if (select_phy) {
1059 dev_dbg(hsotg->dev, "FS PHY selected\n");
1060
1061 usbcfg = dwc2_readl(hsotg, GUSBCFG);
1062 if (!(usbcfg & GUSBCFG_PHYSEL)) {
1063 usbcfg |= GUSBCFG_PHYSEL;
1064 dwc2_writel(hsotg, usbcfg, GUSBCFG);
1065
1066 /* Reset after a PHY select */
1067 retval = dwc2_core_reset(hsotg, false);
1068
1069 if (retval) {
1070 dev_err(hsotg->dev,
1071 "%s: Reset failed, aborting", __func__);
1072 return retval;
1073 }
1074 }
1075
1076 if (hsotg->params.activate_stm_fs_transceiver) {
1077 ggpio = dwc2_readl(hsotg, GGPIO);
1078 if (!(ggpio & GGPIO_STM32_OTG_GCCFG_PWRDWN)) {
1079 dev_dbg(hsotg->dev, "Activating transceiver\n");
1080 /*
1081 * STM32F4x9 uses the GGPIO register as general
1082 * core configuration register.
1083 */
1084 ggpio |= GGPIO_STM32_OTG_GCCFG_PWRDWN;
1085 dwc2_writel(hsotg, ggpio, GGPIO);
1086 }
1087 }
1088 }
1089
1090 /*
1091 * Program DCFG.DevSpd or HCFG.FSLSPclkSel to 48Mhz in FS. Also
1092 * do this on HNP Dev/Host mode switches (done in dev_init and
1093 * host_init).
1094 */
1095 if (dwc2_is_host_mode(hsotg))
1096 dwc2_init_fs_ls_pclk_sel(hsotg);
1097
1098 if (hsotg->params.i2c_enable) {
1099 dev_dbg(hsotg->dev, "FS PHY enabling I2C\n");
1100
1101 /* Program GUSBCFG.OtgUtmiFsSel to I2C */
1102 usbcfg = dwc2_readl(hsotg, GUSBCFG);
1103 usbcfg |= GUSBCFG_OTG_UTMI_FS_SEL;
1104 dwc2_writel(hsotg, usbcfg, GUSBCFG);
1105
1106 /* Program GI2CCTL.I2CEn */
1107 i2cctl = dwc2_readl(hsotg, GI2CCTL);
1108 i2cctl &= ~GI2CCTL_I2CDEVADDR_MASK;
1109 i2cctl |= 1 << GI2CCTL_I2CDEVADDR_SHIFT;
1110 i2cctl &= ~GI2CCTL_I2CEN;
1111 dwc2_writel(hsotg, i2cctl, GI2CCTL);
1112 i2cctl |= GI2CCTL_I2CEN;
1113 dwc2_writel(hsotg, i2cctl, GI2CCTL);
1114 }
1115
1116 return retval;
1117}
1118
1119static int dwc2_hs_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
1120{
1121 u32 usbcfg, usbcfg_old;
1122 int retval = 0;
1123
1124 if (!select_phy)
1125 return 0;
1126
1127 usbcfg = dwc2_readl(hsotg, GUSBCFG);
1128 usbcfg_old = usbcfg;
1129
1130 /*
1131 * HS PHY parameters. These parameters are preserved during soft reset
1132 * so only program the first time. Do a soft reset immediately after
1133 * setting phyif.
1134 */
1135 switch (hsotg->params.phy_type) {
1136 case DWC2_PHY_TYPE_PARAM_ULPI:
1137 /* ULPI interface */
1138 dev_dbg(hsotg->dev, "HS ULPI PHY selected\n");
1139 usbcfg |= GUSBCFG_ULPI_UTMI_SEL;
1140 usbcfg &= ~(GUSBCFG_PHYIF16 | GUSBCFG_DDRSEL);
1141 if (hsotg->params.phy_ulpi_ddr)
1142 usbcfg |= GUSBCFG_DDRSEL;
1143
1144 /* Set external VBUS indicator as needed. */
1145 if (hsotg->params.oc_disable)
1146 usbcfg |= (GUSBCFG_ULPI_INT_VBUS_IND |
1147 GUSBCFG_INDICATORPASSTHROUGH);
1148 break;
1149 case DWC2_PHY_TYPE_PARAM_UTMI:
1150 /* UTMI+ interface */
1151 dev_dbg(hsotg->dev, "HS UTMI+ PHY selected\n");
1152 usbcfg &= ~(GUSBCFG_ULPI_UTMI_SEL | GUSBCFG_PHYIF16);
1153 if (hsotg->params.phy_utmi_width == 16)
1154 usbcfg |= GUSBCFG_PHYIF16;
1155
1156 /* Set turnaround time */
1157 if (dwc2_is_device_mode(hsotg)) {
1158 usbcfg &= ~GUSBCFG_USBTRDTIM_MASK;
1159 if (hsotg->params.phy_utmi_width == 16)
1160 usbcfg |= 5 << GUSBCFG_USBTRDTIM_SHIFT;
1161 else
1162 usbcfg |= 9 << GUSBCFG_USBTRDTIM_SHIFT;
1163 }
1164 break;
1165 default:
1166 dev_err(hsotg->dev, "FS PHY selected at HS!\n");
1167 break;
1168 }
1169
1170 if (usbcfg != usbcfg_old) {
1171 dwc2_writel(hsotg, usbcfg, GUSBCFG);
1172
1173 /* Reset after setting the PHY parameters */
1174 retval = dwc2_core_reset(hsotg, false);
1175 if (retval) {
1176 dev_err(hsotg->dev,
1177 "%s: Reset failed, aborting", __func__);
1178 return retval;
1179 }
1180 }
1181
1182 return retval;
1183}
1184
1185int dwc2_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
1186{
1187 u32 usbcfg;
1188 int retval = 0;
1189
1190 if ((hsotg->params.speed == DWC2_SPEED_PARAM_FULL ||
1191 hsotg->params.speed == DWC2_SPEED_PARAM_LOW) &&
1192 hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS) {
1193 /* If FS/LS mode with FS/LS PHY */
1194 retval = dwc2_fs_phy_init(hsotg, select_phy);
1195 if (retval)
1196 return retval;
1197 } else {
1198 /* High speed PHY */
1199 retval = dwc2_hs_phy_init(hsotg, select_phy);
1200 if (retval)
1201 return retval;
1202 }
1203
1204 if (hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_ULPI &&
1205 hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED &&
1206 hsotg->params.ulpi_fs_ls) {
1207 dev_dbg(hsotg->dev, "Setting ULPI FSLS\n");
1208 usbcfg = dwc2_readl(hsotg, GUSBCFG);
1209 usbcfg |= GUSBCFG_ULPI_FS_LS;
1210 usbcfg |= GUSBCFG_ULPI_CLK_SUSP_M;
1211 dwc2_writel(hsotg, usbcfg, GUSBCFG);
1212 } else {
1213 usbcfg = dwc2_readl(hsotg, GUSBCFG);
1214 usbcfg &= ~GUSBCFG_ULPI_FS_LS;
1215 usbcfg &= ~GUSBCFG_ULPI_CLK_SUSP_M;
1216 dwc2_writel(hsotg, usbcfg, GUSBCFG);
1217 }
1218
1219 return retval;
1220}
1221
1222MODULE_DESCRIPTION("DESIGNWARE HS OTG Core");
1223MODULE_AUTHOR("Synopsys, Inc.");
1224MODULE_LICENSE("Dual BSD/GPL");