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1// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
2/*
3 * core_intr.c - DesignWare HS OTG Controller common interrupt handling
4 *
5 * Copyright (C) 2004-2013 Synopsys, Inc.
6 */
7
8/*
9 * This file contains the common interrupt handlers
10 */
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/moduleparam.h>
14#include <linux/spinlock.h>
15#include <linux/interrupt.h>
16#include <linux/dma-mapping.h>
17#include <linux/io.h>
18#include <linux/slab.h>
19#include <linux/usb.h>
20
21#include <linux/usb/hcd.h>
22#include <linux/usb/ch11.h>
23
24#include "core.h"
25#include "hcd.h"
26
27static const char *dwc2_op_state_str(struct dwc2_hsotg *hsotg)
28{
29 switch (hsotg->op_state) {
30 case OTG_STATE_A_HOST:
31 return "a_host";
32 case OTG_STATE_A_SUSPEND:
33 return "a_suspend";
34 case OTG_STATE_A_PERIPHERAL:
35 return "a_peripheral";
36 case OTG_STATE_B_PERIPHERAL:
37 return "b_peripheral";
38 case OTG_STATE_B_HOST:
39 return "b_host";
40 default:
41 return "unknown";
42 }
43}
44
45/**
46 * dwc2_handle_usb_port_intr - handles OTG PRTINT interrupts.
47 * When the PRTINT interrupt fires, there are certain status bits in the Host
48 * Port that needs to get cleared.
49 *
50 * @hsotg: Programming view of DWC_otg controller
51 */
52static void dwc2_handle_usb_port_intr(struct dwc2_hsotg *hsotg)
53{
54 u32 hprt0 = dwc2_readl(hsotg, HPRT0);
55
56 if (hprt0 & HPRT0_ENACHG) {
57 hprt0 &= ~HPRT0_ENA;
58 dwc2_writel(hsotg, hprt0, HPRT0);
59 }
60}
61
62/**
63 * dwc2_handle_mode_mismatch_intr() - Logs a mode mismatch warning message
64 *
65 * @hsotg: Programming view of DWC_otg controller
66 */
67static void dwc2_handle_mode_mismatch_intr(struct dwc2_hsotg *hsotg)
68{
69 /* Clear interrupt */
70 dwc2_writel(hsotg, GINTSTS_MODEMIS, GINTSTS);
71
72 dev_warn(hsotg->dev, "Mode Mismatch Interrupt: currently in %s mode\n",
73 dwc2_is_host_mode(hsotg) ? "Host" : "Device");
74}
75
76/**
77 * dwc2_handle_otg_intr() - Handles the OTG Interrupts. It reads the OTG
78 * Interrupt Register (GOTGINT) to determine what interrupt has occurred.
79 *
80 * @hsotg: Programming view of DWC_otg controller
81 */
82static void dwc2_handle_otg_intr(struct dwc2_hsotg *hsotg)
83{
84 u32 gotgint;
85 u32 gotgctl;
86 u32 gintmsk;
87
88 gotgint = dwc2_readl(hsotg, GOTGINT);
89 gotgctl = dwc2_readl(hsotg, GOTGCTL);
90 dev_dbg(hsotg->dev, "++OTG Interrupt gotgint=%0x [%s]\n", gotgint,
91 dwc2_op_state_str(hsotg));
92
93 if (gotgint & GOTGINT_SES_END_DET) {
94 dev_dbg(hsotg->dev,
95 " ++OTG Interrupt: Session End Detected++ (%s)\n",
96 dwc2_op_state_str(hsotg));
97 gotgctl = dwc2_readl(hsotg, GOTGCTL);
98
99 if (dwc2_is_device_mode(hsotg))
100 dwc2_hsotg_disconnect(hsotg);
101
102 if (hsotg->op_state == OTG_STATE_B_HOST) {
103 hsotg->op_state = OTG_STATE_B_PERIPHERAL;
104 } else {
105 /*
106 * If not B_HOST and Device HNP still set, HNP did
107 * not succeed!
108 */
109 if (gotgctl & GOTGCTL_DEVHNPEN) {
110 dev_dbg(hsotg->dev, "Session End Detected\n");
111 dev_err(hsotg->dev,
112 "Device Not Connected/Responding!\n");
113 }
114
115 /*
116 * If Session End Detected the B-Cable has been
117 * disconnected
118 */
119 /* Reset to a clean state */
120 hsotg->lx_state = DWC2_L0;
121 }
122
123 gotgctl = dwc2_readl(hsotg, GOTGCTL);
124 gotgctl &= ~GOTGCTL_DEVHNPEN;
125 dwc2_writel(hsotg, gotgctl, GOTGCTL);
126 }
127
128 if (gotgint & GOTGINT_SES_REQ_SUC_STS_CHNG) {
129 dev_dbg(hsotg->dev,
130 " ++OTG Interrupt: Session Request Success Status Change++\n");
131 gotgctl = dwc2_readl(hsotg, GOTGCTL);
132 if (gotgctl & GOTGCTL_SESREQSCS) {
133 if (hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS &&
134 hsotg->params.i2c_enable) {
135 hsotg->srp_success = 1;
136 } else {
137 /* Clear Session Request */
138 gotgctl = dwc2_readl(hsotg, GOTGCTL);
139 gotgctl &= ~GOTGCTL_SESREQ;
140 dwc2_writel(hsotg, gotgctl, GOTGCTL);
141 }
142 }
143 }
144
145 if (gotgint & GOTGINT_HST_NEG_SUC_STS_CHNG) {
146 /*
147 * Print statements during the HNP interrupt handling
148 * can cause it to fail
149 */
150 gotgctl = dwc2_readl(hsotg, GOTGCTL);
151 /*
152 * WA for 3.00a- HW is not setting cur_mode, even sometimes
153 * this does not help
154 */
155 if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_3_00a)
156 udelay(100);
157 if (gotgctl & GOTGCTL_HSTNEGSCS) {
158 if (dwc2_is_host_mode(hsotg)) {
159 hsotg->op_state = OTG_STATE_B_HOST;
160 /*
161 * Need to disable SOF interrupt immediately.
162 * When switching from device to host, the PCD
163 * interrupt handler won't handle the interrupt
164 * if host mode is already set. The HCD
165 * interrupt handler won't get called if the
166 * HCD state is HALT. This means that the
167 * interrupt does not get handled and Linux
168 * complains loudly.
169 */
170 gintmsk = dwc2_readl(hsotg, GINTMSK);
171 gintmsk &= ~GINTSTS_SOF;
172 dwc2_writel(hsotg, gintmsk, GINTMSK);
173
174 /*
175 * Call callback function with spin lock
176 * released
177 */
178 spin_unlock(&hsotg->lock);
179
180 /* Initialize the Core for Host mode */
181 dwc2_hcd_start(hsotg);
182 spin_lock(&hsotg->lock);
183 hsotg->op_state = OTG_STATE_B_HOST;
184 }
185 } else {
186 gotgctl = dwc2_readl(hsotg, GOTGCTL);
187 gotgctl &= ~(GOTGCTL_HNPREQ | GOTGCTL_DEVHNPEN);
188 dwc2_writel(hsotg, gotgctl, GOTGCTL);
189 dev_dbg(hsotg->dev, "HNP Failed\n");
190 dev_err(hsotg->dev,
191 "Device Not Connected/Responding\n");
192 }
193 }
194
195 if (gotgint & GOTGINT_HST_NEG_DET) {
196 /*
197 * The disconnect interrupt is set at the same time as
198 * Host Negotiation Detected. During the mode switch all
199 * interrupts are cleared so the disconnect interrupt
200 * handler will not get executed.
201 */
202 dev_dbg(hsotg->dev,
203 " ++OTG Interrupt: Host Negotiation Detected++ (%s)\n",
204 (dwc2_is_host_mode(hsotg) ? "Host" : "Device"));
205 if (dwc2_is_device_mode(hsotg)) {
206 dev_dbg(hsotg->dev, "a_suspend->a_peripheral (%d)\n",
207 hsotg->op_state);
208 spin_unlock(&hsotg->lock);
209 dwc2_hcd_disconnect(hsotg, false);
210 spin_lock(&hsotg->lock);
211 hsotg->op_state = OTG_STATE_A_PERIPHERAL;
212 } else {
213 /* Need to disable SOF interrupt immediately */
214 gintmsk = dwc2_readl(hsotg, GINTMSK);
215 gintmsk &= ~GINTSTS_SOF;
216 dwc2_writel(hsotg, gintmsk, GINTMSK);
217 spin_unlock(&hsotg->lock);
218 dwc2_hcd_start(hsotg);
219 spin_lock(&hsotg->lock);
220 hsotg->op_state = OTG_STATE_A_HOST;
221 }
222 }
223
224 if (gotgint & GOTGINT_A_DEV_TOUT_CHG)
225 dev_dbg(hsotg->dev,
226 " ++OTG Interrupt: A-Device Timeout Change++\n");
227 if (gotgint & GOTGINT_DBNCE_DONE)
228 dev_dbg(hsotg->dev, " ++OTG Interrupt: Debounce Done++\n");
229
230 /* Clear GOTGINT */
231 dwc2_writel(hsotg, gotgint, GOTGINT);
232}
233
234/**
235 * dwc2_handle_conn_id_status_change_intr() - Handles the Connector ID Status
236 * Change Interrupt
237 *
238 * @hsotg: Programming view of DWC_otg controller
239 *
240 * Reads the OTG Interrupt Register (GOTCTL) to determine whether this is a
241 * Device to Host Mode transition or a Host to Device Mode transition. This only
242 * occurs when the cable is connected/removed from the PHY connector.
243 */
244static void dwc2_handle_conn_id_status_change_intr(struct dwc2_hsotg *hsotg)
245{
246 u32 gintmsk;
247
248 /* Clear interrupt */
249 dwc2_writel(hsotg, GINTSTS_CONIDSTSCHNG, GINTSTS);
250
251 /* Need to disable SOF interrupt immediately */
252 gintmsk = dwc2_readl(hsotg, GINTMSK);
253 gintmsk &= ~GINTSTS_SOF;
254 dwc2_writel(hsotg, gintmsk, GINTMSK);
255
256 dev_dbg(hsotg->dev, " ++Connector ID Status Change Interrupt++ (%s)\n",
257 dwc2_is_host_mode(hsotg) ? "Host" : "Device");
258
259 /*
260 * Need to schedule a work, as there are possible DELAY function calls.
261 */
262 if (hsotg->wq_otg)
263 queue_work(hsotg->wq_otg, &hsotg->wf_otg);
264}
265
266/**
267 * dwc2_handle_session_req_intr() - This interrupt indicates that a device is
268 * initiating the Session Request Protocol to request the host to turn on bus
269 * power so a new session can begin
270 *
271 * @hsotg: Programming view of DWC_otg controller
272 *
273 * This handler responds by turning on bus power. If the DWC_otg controller is
274 * in low power mode, this handler brings the controller out of low power mode
275 * before turning on bus power.
276 */
277static void dwc2_handle_session_req_intr(struct dwc2_hsotg *hsotg)
278{
279 int ret;
280 u32 hprt0;
281
282 /* Clear interrupt */
283 dwc2_writel(hsotg, GINTSTS_SESSREQINT, GINTSTS);
284
285 dev_dbg(hsotg->dev, "Session request interrupt - lx_state=%d\n",
286 hsotg->lx_state);
287
288 if (dwc2_is_device_mode(hsotg)) {
289 if (hsotg->lx_state == DWC2_L2) {
290 if (hsotg->in_ppd) {
291 ret = dwc2_exit_partial_power_down(hsotg, 0,
292 true);
293 if (ret)
294 dev_err(hsotg->dev,
295 "exit power_down failed\n");
296 }
297
298 /* Exit gadget mode clock gating. */
299 if (hsotg->params.power_down ==
300 DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended)
301 dwc2_gadget_exit_clock_gating(hsotg, 0);
302 }
303
304 /*
305 * Report disconnect if there is any previous session
306 * established
307 */
308 dwc2_hsotg_disconnect(hsotg);
309 } else {
310 /* Turn on the port power bit. */
311 hprt0 = dwc2_read_hprt0(hsotg);
312 hprt0 |= HPRT0_PWR;
313 dwc2_writel(hsotg, hprt0, HPRT0);
314 /* Connect hcd after port power is set. */
315 dwc2_hcd_connect(hsotg);
316 }
317}
318
319/**
320 * dwc2_wakeup_from_lpm_l1 - Exit the device from LPM L1 state
321 *
322 * @hsotg: Programming view of DWC_otg controller
323 *
324 */
325static void dwc2_wakeup_from_lpm_l1(struct dwc2_hsotg *hsotg)
326{
327 u32 glpmcfg;
328 u32 i = 0;
329
330 if (hsotg->lx_state != DWC2_L1) {
331 dev_err(hsotg->dev, "Core isn't in DWC2_L1 state\n");
332 return;
333 }
334
335 glpmcfg = dwc2_readl(hsotg, GLPMCFG);
336 if (dwc2_is_device_mode(hsotg)) {
337 dev_dbg(hsotg->dev, "Exit from L1 state\n");
338 glpmcfg &= ~GLPMCFG_ENBLSLPM;
339 glpmcfg &= ~GLPMCFG_HIRD_THRES_EN;
340 dwc2_writel(hsotg, glpmcfg, GLPMCFG);
341
342 do {
343 glpmcfg = dwc2_readl(hsotg, GLPMCFG);
344
345 if (!(glpmcfg & (GLPMCFG_COREL1RES_MASK |
346 GLPMCFG_L1RESUMEOK | GLPMCFG_SLPSTS)))
347 break;
348
349 udelay(1);
350 } while (++i < 200);
351
352 if (i == 200) {
353 dev_err(hsotg->dev, "Failed to exit L1 sleep state in 200us.\n");
354 return;
355 }
356 dwc2_gadget_init_lpm(hsotg);
357 } else {
358 /* TODO */
359 dev_err(hsotg->dev, "Host side LPM is not supported.\n");
360 return;
361 }
362
363 /* Change to L0 state */
364 hsotg->lx_state = DWC2_L0;
365
366 /* Inform gadget to exit from L1 */
367 call_gadget(hsotg, resume);
368}
369
370/*
371 * This interrupt indicates that the DWC_otg controller has detected a
372 * resume or remote wakeup sequence. If the DWC_otg controller is in
373 * low power mode, the handler must brings the controller out of low
374 * power mode. The controller automatically begins resume signaling.
375 * The handler schedules a time to stop resume signaling.
376 */
377static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg)
378{
379 int ret;
380
381 /* Clear interrupt */
382 dwc2_writel(hsotg, GINTSTS_WKUPINT, GINTSTS);
383
384 dev_dbg(hsotg->dev, "++Resume or Remote Wakeup Detected Interrupt++\n");
385 dev_dbg(hsotg->dev, "%s lxstate = %d\n", __func__, hsotg->lx_state);
386
387 if (hsotg->lx_state == DWC2_L1) {
388 dwc2_wakeup_from_lpm_l1(hsotg);
389 return;
390 }
391
392 if (dwc2_is_device_mode(hsotg)) {
393 dev_dbg(hsotg->dev, "DSTS=0x%0x\n",
394 dwc2_readl(hsotg, DSTS));
395 if (hsotg->lx_state == DWC2_L2) {
396 if (hsotg->in_ppd) {
397 u32 dctl = dwc2_readl(hsotg, DCTL);
398 /* Clear Remote Wakeup Signaling */
399 dctl &= ~DCTL_RMTWKUPSIG;
400 dwc2_writel(hsotg, dctl, DCTL);
401 ret = dwc2_exit_partial_power_down(hsotg, 1,
402 true);
403 if (ret)
404 dev_err(hsotg->dev,
405 "exit partial_power_down failed\n");
406 call_gadget(hsotg, resume);
407 }
408
409 /* Exit gadget mode clock gating. */
410 if (hsotg->params.power_down ==
411 DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended)
412 dwc2_gadget_exit_clock_gating(hsotg, 0);
413 } else {
414 /* Change to L0 state */
415 hsotg->lx_state = DWC2_L0;
416 }
417 } else {
418 if (hsotg->lx_state == DWC2_L2) {
419 if (hsotg->in_ppd) {
420 ret = dwc2_exit_partial_power_down(hsotg, 1,
421 true);
422 if (ret)
423 dev_err(hsotg->dev,
424 "exit partial_power_down failed\n");
425 }
426
427 if (hsotg->params.power_down ==
428 DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended)
429 dwc2_host_exit_clock_gating(hsotg, 1);
430
431 /*
432 * If we've got this quirk then the PHY is stuck upon
433 * wakeup. Assert reset. This will propagate out and
434 * eventually we'll re-enumerate the device. Not great
435 * but the best we can do. We can't call phy_reset()
436 * at interrupt time but there's no hurry, so we'll
437 * schedule it for later.
438 */
439 if (hsotg->reset_phy_on_wake)
440 dwc2_host_schedule_phy_reset(hsotg);
441
442 mod_timer(&hsotg->wkp_timer,
443 jiffies + msecs_to_jiffies(71));
444 } else {
445 /* Change to L0 state */
446 hsotg->lx_state = DWC2_L0;
447 }
448 }
449}
450
451/*
452 * This interrupt indicates that a device has been disconnected from the
453 * root port
454 */
455static void dwc2_handle_disconnect_intr(struct dwc2_hsotg *hsotg)
456{
457 dwc2_writel(hsotg, GINTSTS_DISCONNINT, GINTSTS);
458
459 dev_dbg(hsotg->dev, "++Disconnect Detected Interrupt++ (%s) %s\n",
460 dwc2_is_host_mode(hsotg) ? "Host" : "Device",
461 dwc2_op_state_str(hsotg));
462
463 if (hsotg->op_state == OTG_STATE_A_HOST)
464 dwc2_hcd_disconnect(hsotg, false);
465}
466
467/*
468 * This interrupt indicates that SUSPEND state has been detected on the USB.
469 *
470 * For HNP the USB Suspend interrupt signals the change from "a_peripheral"
471 * to "a_host".
472 *
473 * When power management is enabled the core will be put in low power mode.
474 */
475static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg)
476{
477 u32 dsts;
478 int ret;
479
480 /* Clear interrupt */
481 dwc2_writel(hsotg, GINTSTS_USBSUSP, GINTSTS);
482
483 dev_dbg(hsotg->dev, "USB SUSPEND\n");
484
485 if (dwc2_is_device_mode(hsotg)) {
486 /*
487 * Check the Device status register to determine if the Suspend
488 * state is active
489 */
490 dsts = dwc2_readl(hsotg, DSTS);
491 dev_dbg(hsotg->dev, "%s: DSTS=0x%0x\n", __func__, dsts);
492 dev_dbg(hsotg->dev,
493 "DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d HWCFG4.Hibernation=%d\n",
494 !!(dsts & DSTS_SUSPSTS),
495 hsotg->hw_params.power_optimized,
496 hsotg->hw_params.hibernation);
497
498 /* Ignore suspend request before enumeration */
499 if (!dwc2_is_device_connected(hsotg)) {
500 dev_dbg(hsotg->dev,
501 "ignore suspend request before enumeration\n");
502 return;
503 }
504 if (dsts & DSTS_SUSPSTS) {
505 switch (hsotg->params.power_down) {
506 case DWC2_POWER_DOWN_PARAM_PARTIAL:
507 ret = dwc2_enter_partial_power_down(hsotg);
508 if (ret)
509 dev_err(hsotg->dev,
510 "enter partial_power_down failed\n");
511
512 udelay(100);
513
514 /* Ask phy to be suspended */
515 if (!IS_ERR_OR_NULL(hsotg->uphy))
516 usb_phy_set_suspend(hsotg->uphy, true);
517 break;
518 case DWC2_POWER_DOWN_PARAM_HIBERNATION:
519 ret = dwc2_enter_hibernation(hsotg, 0);
520 if (ret)
521 dev_err(hsotg->dev,
522 "enter hibernation failed\n");
523 break;
524 case DWC2_POWER_DOWN_PARAM_NONE:
525 /*
526 * If neither hibernation nor partial power down are supported,
527 * clock gating is used to save power.
528 */
529 if (!hsotg->params.no_clock_gating)
530 dwc2_gadget_enter_clock_gating(hsotg);
531 }
532
533 /*
534 * Change to L2 (suspend) state before releasing
535 * spinlock
536 */
537 hsotg->lx_state = DWC2_L2;
538
539 /* Call gadget suspend callback */
540 call_gadget(hsotg, suspend);
541 }
542 } else {
543 if (hsotg->op_state == OTG_STATE_A_PERIPHERAL) {
544 dev_dbg(hsotg->dev, "a_peripheral->a_host\n");
545
546 /* Change to L2 (suspend) state */
547 hsotg->lx_state = DWC2_L2;
548 /* Clear the a_peripheral flag, back to a_host */
549 spin_unlock(&hsotg->lock);
550 dwc2_hcd_start(hsotg);
551 spin_lock(&hsotg->lock);
552 hsotg->op_state = OTG_STATE_A_HOST;
553 }
554 }
555}
556
557/**
558 * dwc2_handle_lpm_intr - GINTSTS_LPMTRANRCVD Interrupt handler
559 *
560 * @hsotg: Programming view of DWC_otg controller
561 *
562 */
563static void dwc2_handle_lpm_intr(struct dwc2_hsotg *hsotg)
564{
565 u32 glpmcfg;
566 u32 pcgcctl;
567 u32 hird;
568 u32 hird_thres;
569 u32 hird_thres_en;
570 u32 enslpm;
571
572 /* Clear interrupt */
573 dwc2_writel(hsotg, GINTSTS_LPMTRANRCVD, GINTSTS);
574
575 glpmcfg = dwc2_readl(hsotg, GLPMCFG);
576
577 if (!(glpmcfg & GLPMCFG_LPMCAP)) {
578 dev_err(hsotg->dev, "Unexpected LPM interrupt\n");
579 return;
580 }
581
582 hird = (glpmcfg & GLPMCFG_HIRD_MASK) >> GLPMCFG_HIRD_SHIFT;
583 hird_thres = (glpmcfg & GLPMCFG_HIRD_THRES_MASK &
584 ~GLPMCFG_HIRD_THRES_EN) >> GLPMCFG_HIRD_THRES_SHIFT;
585 hird_thres_en = glpmcfg & GLPMCFG_HIRD_THRES_EN;
586 enslpm = glpmcfg & GLPMCFG_ENBLSLPM;
587
588 if (dwc2_is_device_mode(hsotg)) {
589 dev_dbg(hsotg->dev, "HIRD_THRES_EN = %d\n", hird_thres_en);
590
591 if (hird_thres_en && hird >= hird_thres) {
592 dev_dbg(hsotg->dev, "L1 with utmi_l1_suspend_n\n");
593 } else if (enslpm) {
594 dev_dbg(hsotg->dev, "L1 with utmi_sleep_n\n");
595 } else {
596 dev_dbg(hsotg->dev, "Entering Sleep with L1 Gating\n");
597
598 pcgcctl = dwc2_readl(hsotg, PCGCTL);
599 pcgcctl |= PCGCTL_ENBL_SLEEP_GATING;
600 dwc2_writel(hsotg, pcgcctl, PCGCTL);
601 }
602 /**
603 * Examine prt_sleep_sts after TL1TokenTetry period max (10 us)
604 */
605 udelay(10);
606
607 glpmcfg = dwc2_readl(hsotg, GLPMCFG);
608
609 if (glpmcfg & GLPMCFG_SLPSTS) {
610 /* Save the current state */
611 hsotg->lx_state = DWC2_L1;
612 dev_dbg(hsotg->dev,
613 "Core is in L1 sleep glpmcfg=%08x\n", glpmcfg);
614
615 /* Inform gadget that we are in L1 state */
616 call_gadget(hsotg, suspend);
617 }
618 }
619}
620
621#define GINTMSK_COMMON (GINTSTS_WKUPINT | GINTSTS_SESSREQINT | \
622 GINTSTS_CONIDSTSCHNG | GINTSTS_OTGINT | \
623 GINTSTS_MODEMIS | GINTSTS_DISCONNINT | \
624 GINTSTS_USBSUSP | GINTSTS_PRTINT | \
625 GINTSTS_LPMTRANRCVD)
626
627/*
628 * This function returns the Core Interrupt register
629 */
630static u32 dwc2_read_common_intr(struct dwc2_hsotg *hsotg)
631{
632 u32 gintsts;
633 u32 gintmsk;
634 u32 gahbcfg;
635 u32 gintmsk_common = GINTMSK_COMMON;
636
637 gintsts = dwc2_readl(hsotg, GINTSTS);
638 gintmsk = dwc2_readl(hsotg, GINTMSK);
639 gahbcfg = dwc2_readl(hsotg, GAHBCFG);
640
641 /* If any common interrupts set */
642 if (gintsts & gintmsk_common)
643 dev_dbg(hsotg->dev, "gintsts=%08x gintmsk=%08x\n",
644 gintsts, gintmsk);
645
646 if (gahbcfg & GAHBCFG_GLBL_INTR_EN)
647 return gintsts & gintmsk & gintmsk_common;
648 else
649 return 0;
650}
651
652/**
653 * dwc_handle_gpwrdn_disc_det() - Handles the gpwrdn disconnect detect.
654 * Exits hibernation without restoring registers.
655 *
656 * @hsotg: Programming view of DWC_otg controller
657 * @gpwrdn: GPWRDN register
658 */
659static inline void dwc_handle_gpwrdn_disc_det(struct dwc2_hsotg *hsotg,
660 u32 gpwrdn)
661{
662 u32 gpwrdn_tmp;
663
664 /* Switch-on voltage to the core */
665 gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
666 gpwrdn_tmp &= ~GPWRDN_PWRDNSWTCH;
667 dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
668 udelay(5);
669
670 /* Reset core */
671 gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
672 gpwrdn_tmp &= ~GPWRDN_PWRDNRSTN;
673 dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
674 udelay(5);
675
676 /* Disable Power Down Clamp */
677 gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
678 gpwrdn_tmp &= ~GPWRDN_PWRDNCLMP;
679 dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
680 udelay(5);
681
682 /* Deassert reset core */
683 gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
684 gpwrdn_tmp |= GPWRDN_PWRDNRSTN;
685 dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
686 udelay(5);
687
688 /* Disable PMU interrupt */
689 gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
690 gpwrdn_tmp &= ~GPWRDN_PMUINTSEL;
691 dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
692
693 /* De-assert Wakeup Logic */
694 gpwrdn_tmp = dwc2_readl(hsotg, GPWRDN);
695 gpwrdn_tmp &= ~GPWRDN_PMUACTV;
696 dwc2_writel(hsotg, gpwrdn_tmp, GPWRDN);
697
698 hsotg->hibernated = 0;
699 hsotg->bus_suspended = 0;
700
701 if (gpwrdn & GPWRDN_IDSTS) {
702 hsotg->op_state = OTG_STATE_B_PERIPHERAL;
703 dwc2_core_init(hsotg, false);
704 dwc2_enable_global_interrupts(hsotg);
705 dwc2_hsotg_core_init_disconnected(hsotg, false);
706 dwc2_hsotg_core_connect(hsotg);
707 } else {
708 hsotg->op_state = OTG_STATE_A_HOST;
709
710 /* Initialize the Core for Host mode */
711 dwc2_core_init(hsotg, false);
712 dwc2_enable_global_interrupts(hsotg);
713 dwc2_hcd_start(hsotg);
714 }
715}
716
717/*
718 * GPWRDN interrupt handler.
719 *
720 * The GPWRDN interrupts are those that occur in both Host and
721 * Device mode while core is in hibernated state.
722 */
723static int dwc2_handle_gpwrdn_intr(struct dwc2_hsotg *hsotg)
724{
725 u32 gpwrdn;
726 int linestate;
727 int ret = 0;
728
729 gpwrdn = dwc2_readl(hsotg, GPWRDN);
730 /* clear all interrupt */
731 dwc2_writel(hsotg, gpwrdn, GPWRDN);
732 linestate = (gpwrdn & GPWRDN_LINESTATE_MASK) >> GPWRDN_LINESTATE_SHIFT;
733 dev_dbg(hsotg->dev,
734 "%s: dwc2_handle_gpwrdwn_intr called gpwrdn= %08x\n", __func__,
735 gpwrdn);
736
737 if ((gpwrdn & GPWRDN_DISCONN_DET) &&
738 (gpwrdn & GPWRDN_DISCONN_DET_MSK) && !linestate) {
739 dev_dbg(hsotg->dev, "%s: GPWRDN_DISCONN_DET\n", __func__);
740 /*
741 * Call disconnect detect function to exit from
742 * hibernation
743 */
744 dwc_handle_gpwrdn_disc_det(hsotg, gpwrdn);
745 } else if ((gpwrdn & GPWRDN_LNSTSCHG) &&
746 (gpwrdn & GPWRDN_LNSTSCHG_MSK) && linestate) {
747 dev_dbg(hsotg->dev, "%s: GPWRDN_LNSTSCHG\n", __func__);
748 if (hsotg->hw_params.hibernation &&
749 hsotg->hibernated) {
750 if (gpwrdn & GPWRDN_IDSTS) {
751 ret = dwc2_exit_hibernation(hsotg, 0, 0, 0);
752 if (ret)
753 dev_err(hsotg->dev,
754 "exit hibernation failed.\n");
755 call_gadget(hsotg, resume);
756 } else {
757 ret = dwc2_exit_hibernation(hsotg, 1, 0, 1);
758 if (ret)
759 dev_err(hsotg->dev,
760 "exit hibernation failed.\n");
761 }
762 }
763 } else if ((gpwrdn & GPWRDN_RST_DET) &&
764 (gpwrdn & GPWRDN_RST_DET_MSK)) {
765 dev_dbg(hsotg->dev, "%s: GPWRDN_RST_DET\n", __func__);
766 if (!linestate) {
767 ret = dwc2_exit_hibernation(hsotg, 0, 1, 0);
768 if (ret)
769 dev_err(hsotg->dev,
770 "exit hibernation failed.\n");
771 }
772 } else if ((gpwrdn & GPWRDN_STS_CHGINT) &&
773 (gpwrdn & GPWRDN_STS_CHGINT_MSK)) {
774 dev_dbg(hsotg->dev, "%s: GPWRDN_STS_CHGINT\n", __func__);
775 /*
776 * As GPWRDN_STS_CHGINT exit from hibernation flow is
777 * the same as in GPWRDN_DISCONN_DET flow. Call
778 * disconnect detect helper function to exit from
779 * hibernation.
780 */
781 dwc_handle_gpwrdn_disc_det(hsotg, gpwrdn);
782 }
783
784 return ret;
785}
786
787/*
788 * Common interrupt handler
789 *
790 * The common interrupts are those that occur in both Host and Device mode.
791 * This handler handles the following interrupts:
792 * - Mode Mismatch Interrupt
793 * - OTG Interrupt
794 * - Connector ID Status Change Interrupt
795 * - Disconnect Interrupt
796 * - Session Request Interrupt
797 * - Resume / Remote Wakeup Detected Interrupt
798 * - Suspend Interrupt
799 */
800irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
801{
802 struct dwc2_hsotg *hsotg = dev;
803 u32 gintsts;
804 irqreturn_t retval = IRQ_NONE;
805
806 spin_lock(&hsotg->lock);
807
808 if (!dwc2_is_controller_alive(hsotg)) {
809 dev_warn(hsotg->dev, "Controller is dead\n");
810 goto out;
811 }
812
813 /* Reading current frame number value in device or host modes. */
814 if (dwc2_is_device_mode(hsotg))
815 hsotg->frame_number = (dwc2_readl(hsotg, DSTS)
816 & DSTS_SOFFN_MASK) >> DSTS_SOFFN_SHIFT;
817 else
818 hsotg->frame_number = (dwc2_readl(hsotg, HFNUM)
819 & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT;
820
821 gintsts = dwc2_read_common_intr(hsotg);
822 if (gintsts & ~GINTSTS_PRTINT)
823 retval = IRQ_HANDLED;
824
825 /* In case of hibernated state gintsts must not work */
826 if (hsotg->hibernated) {
827 dwc2_handle_gpwrdn_intr(hsotg);
828 retval = IRQ_HANDLED;
829 goto out;
830 }
831
832 if (gintsts & GINTSTS_MODEMIS)
833 dwc2_handle_mode_mismatch_intr(hsotg);
834 if (gintsts & GINTSTS_OTGINT)
835 dwc2_handle_otg_intr(hsotg);
836 if (gintsts & GINTSTS_CONIDSTSCHNG)
837 dwc2_handle_conn_id_status_change_intr(hsotg);
838 if (gintsts & GINTSTS_DISCONNINT)
839 dwc2_handle_disconnect_intr(hsotg);
840 if (gintsts & GINTSTS_SESSREQINT)
841 dwc2_handle_session_req_intr(hsotg);
842 if (gintsts & GINTSTS_WKUPINT)
843 dwc2_handle_wakeup_detected_intr(hsotg);
844 if (gintsts & GINTSTS_USBSUSP)
845 dwc2_handle_usb_suspend_intr(hsotg);
846 if (gintsts & GINTSTS_LPMTRANRCVD)
847 dwc2_handle_lpm_intr(hsotg);
848
849 if (gintsts & GINTSTS_PRTINT) {
850 /*
851 * The port interrupt occurs while in device mode with HPRT0
852 * Port Enable/Disable
853 */
854 if (dwc2_is_device_mode(hsotg)) {
855 dev_dbg(hsotg->dev,
856 " --Port interrupt received in Device mode--\n");
857 dwc2_handle_usb_port_intr(hsotg);
858 retval = IRQ_HANDLED;
859 }
860 }
861
862out:
863 spin_unlock(&hsotg->lock);
864 return retval;
865}
1/*
2 * core_intr.c - DesignWare HS OTG Controller common interrupt handling
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 * This file contains the common interrupt handlers
39 */
40#include <linux/kernel.h>
41#include <linux/module.h>
42#include <linux/moduleparam.h>
43#include <linux/spinlock.h>
44#include <linux/interrupt.h>
45#include <linux/dma-mapping.h>
46#include <linux/io.h>
47#include <linux/slab.h>
48#include <linux/usb.h>
49
50#include <linux/usb/hcd.h>
51#include <linux/usb/ch11.h>
52
53#include "core.h"
54#include "hcd.h"
55
56static const char *dwc2_op_state_str(struct dwc2_hsotg *hsotg)
57{
58 switch (hsotg->op_state) {
59 case OTG_STATE_A_HOST:
60 return "a_host";
61 case OTG_STATE_A_SUSPEND:
62 return "a_suspend";
63 case OTG_STATE_A_PERIPHERAL:
64 return "a_peripheral";
65 case OTG_STATE_B_PERIPHERAL:
66 return "b_peripheral";
67 case OTG_STATE_B_HOST:
68 return "b_host";
69 default:
70 return "unknown";
71 }
72}
73
74/**
75 * dwc2_handle_usb_port_intr - handles OTG PRTINT interrupts.
76 * When the PRTINT interrupt fires, there are certain status bits in the Host
77 * Port that needs to get cleared.
78 *
79 * @hsotg: Programming view of DWC_otg controller
80 */
81static void dwc2_handle_usb_port_intr(struct dwc2_hsotg *hsotg)
82{
83 u32 hprt0 = dwc2_readl(hsotg->regs + HPRT0);
84
85 if (hprt0 & HPRT0_ENACHG) {
86 hprt0 &= ~HPRT0_ENA;
87 dwc2_writel(hprt0, hsotg->regs + HPRT0);
88 }
89}
90
91/**
92 * dwc2_handle_mode_mismatch_intr() - Logs a mode mismatch warning message
93 *
94 * @hsotg: Programming view of DWC_otg controller
95 */
96static void dwc2_handle_mode_mismatch_intr(struct dwc2_hsotg *hsotg)
97{
98 /* Clear interrupt */
99 dwc2_writel(GINTSTS_MODEMIS, hsotg->regs + GINTSTS);
100
101 dev_warn(hsotg->dev, "Mode Mismatch Interrupt: currently in %s mode\n",
102 dwc2_is_host_mode(hsotg) ? "Host" : "Device");
103}
104
105/**
106 * dwc2_handle_otg_intr() - Handles the OTG Interrupts. It reads the OTG
107 * Interrupt Register (GOTGINT) to determine what interrupt has occurred.
108 *
109 * @hsotg: Programming view of DWC_otg controller
110 */
111static void dwc2_handle_otg_intr(struct dwc2_hsotg *hsotg)
112{
113 u32 gotgint;
114 u32 gotgctl;
115 u32 gintmsk;
116
117 gotgint = dwc2_readl(hsotg->regs + GOTGINT);
118 gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
119 dev_dbg(hsotg->dev, "++OTG Interrupt gotgint=%0x [%s]\n", gotgint,
120 dwc2_op_state_str(hsotg));
121
122 if (gotgint & GOTGINT_SES_END_DET) {
123 dev_dbg(hsotg->dev,
124 " ++OTG Interrupt: Session End Detected++ (%s)\n",
125 dwc2_op_state_str(hsotg));
126 gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
127
128 if (dwc2_is_device_mode(hsotg))
129 dwc2_hsotg_disconnect(hsotg);
130
131 if (hsotg->op_state == OTG_STATE_B_HOST) {
132 hsotg->op_state = OTG_STATE_B_PERIPHERAL;
133 } else {
134 /*
135 * If not B_HOST and Device HNP still set, HNP did
136 * not succeed!
137 */
138 if (gotgctl & GOTGCTL_DEVHNPEN) {
139 dev_dbg(hsotg->dev, "Session End Detected\n");
140 dev_err(hsotg->dev,
141 "Device Not Connected/Responding!\n");
142 }
143
144 /*
145 * If Session End Detected the B-Cable has been
146 * disconnected
147 */
148 /* Reset to a clean state */
149 hsotg->lx_state = DWC2_L0;
150 }
151
152 gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
153 gotgctl &= ~GOTGCTL_DEVHNPEN;
154 dwc2_writel(gotgctl, hsotg->regs + GOTGCTL);
155 }
156
157 if (gotgint & GOTGINT_SES_REQ_SUC_STS_CHNG) {
158 dev_dbg(hsotg->dev,
159 " ++OTG Interrupt: Session Request Success Status Change++\n");
160 gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
161 if (gotgctl & GOTGCTL_SESREQSCS) {
162 if (hsotg->params.phy_type ==
163 DWC2_PHY_TYPE_PARAM_FS
164 && hsotg->params.i2c_enable > 0) {
165 hsotg->srp_success = 1;
166 } else {
167 /* Clear Session Request */
168 gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
169 gotgctl &= ~GOTGCTL_SESREQ;
170 dwc2_writel(gotgctl, hsotg->regs + GOTGCTL);
171 }
172 }
173 }
174
175 if (gotgint & GOTGINT_HST_NEG_SUC_STS_CHNG) {
176 /*
177 * Print statements during the HNP interrupt handling
178 * can cause it to fail
179 */
180 gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
181 /*
182 * WA for 3.00a- HW is not setting cur_mode, even sometimes
183 * this does not help
184 */
185 if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_3_00a)
186 udelay(100);
187 if (gotgctl & GOTGCTL_HSTNEGSCS) {
188 if (dwc2_is_host_mode(hsotg)) {
189 hsotg->op_state = OTG_STATE_B_HOST;
190 /*
191 * Need to disable SOF interrupt immediately.
192 * When switching from device to host, the PCD
193 * interrupt handler won't handle the interrupt
194 * if host mode is already set. The HCD
195 * interrupt handler won't get called if the
196 * HCD state is HALT. This means that the
197 * interrupt does not get handled and Linux
198 * complains loudly.
199 */
200 gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
201 gintmsk &= ~GINTSTS_SOF;
202 dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
203
204 /*
205 * Call callback function with spin lock
206 * released
207 */
208 spin_unlock(&hsotg->lock);
209
210 /* Initialize the Core for Host mode */
211 dwc2_hcd_start(hsotg);
212 spin_lock(&hsotg->lock);
213 hsotg->op_state = OTG_STATE_B_HOST;
214 }
215 } else {
216 gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
217 gotgctl &= ~(GOTGCTL_HNPREQ | GOTGCTL_DEVHNPEN);
218 dwc2_writel(gotgctl, hsotg->regs + GOTGCTL);
219 dev_dbg(hsotg->dev, "HNP Failed\n");
220 dev_err(hsotg->dev,
221 "Device Not Connected/Responding\n");
222 }
223 }
224
225 if (gotgint & GOTGINT_HST_NEG_DET) {
226 /*
227 * The disconnect interrupt is set at the same time as
228 * Host Negotiation Detected. During the mode switch all
229 * interrupts are cleared so the disconnect interrupt
230 * handler will not get executed.
231 */
232 dev_dbg(hsotg->dev,
233 " ++OTG Interrupt: Host Negotiation Detected++ (%s)\n",
234 (dwc2_is_host_mode(hsotg) ? "Host" : "Device"));
235 if (dwc2_is_device_mode(hsotg)) {
236 dev_dbg(hsotg->dev, "a_suspend->a_peripheral (%d)\n",
237 hsotg->op_state);
238 spin_unlock(&hsotg->lock);
239 dwc2_hcd_disconnect(hsotg, false);
240 spin_lock(&hsotg->lock);
241 hsotg->op_state = OTG_STATE_A_PERIPHERAL;
242 } else {
243 /* Need to disable SOF interrupt immediately */
244 gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
245 gintmsk &= ~GINTSTS_SOF;
246 dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
247 spin_unlock(&hsotg->lock);
248 dwc2_hcd_start(hsotg);
249 spin_lock(&hsotg->lock);
250 hsotg->op_state = OTG_STATE_A_HOST;
251 }
252 }
253
254 if (gotgint & GOTGINT_A_DEV_TOUT_CHG)
255 dev_dbg(hsotg->dev,
256 " ++OTG Interrupt: A-Device Timeout Change++\n");
257 if (gotgint & GOTGINT_DBNCE_DONE)
258 dev_dbg(hsotg->dev, " ++OTG Interrupt: Debounce Done++\n");
259
260 /* Clear GOTGINT */
261 dwc2_writel(gotgint, hsotg->regs + GOTGINT);
262}
263
264/**
265 * dwc2_handle_conn_id_status_change_intr() - Handles the Connector ID Status
266 * Change Interrupt
267 *
268 * @hsotg: Programming view of DWC_otg controller
269 *
270 * Reads the OTG Interrupt Register (GOTCTL) to determine whether this is a
271 * Device to Host Mode transition or a Host to Device Mode transition. This only
272 * occurs when the cable is connected/removed from the PHY connector.
273 */
274static void dwc2_handle_conn_id_status_change_intr(struct dwc2_hsotg *hsotg)
275{
276 u32 gintmsk;
277
278 /* Clear interrupt */
279 dwc2_writel(GINTSTS_CONIDSTSCHNG, hsotg->regs + GINTSTS);
280
281 /* Need to disable SOF interrupt immediately */
282 gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
283 gintmsk &= ~GINTSTS_SOF;
284 dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
285
286 dev_dbg(hsotg->dev, " ++Connector ID Status Change Interrupt++ (%s)\n",
287 dwc2_is_host_mode(hsotg) ? "Host" : "Device");
288
289 /*
290 * Need to schedule a work, as there are possible DELAY function calls.
291 * Release lock before scheduling workq as it holds spinlock during
292 * scheduling.
293 */
294 if (hsotg->wq_otg) {
295 spin_unlock(&hsotg->lock);
296 queue_work(hsotg->wq_otg, &hsotg->wf_otg);
297 spin_lock(&hsotg->lock);
298 }
299}
300
301/**
302 * dwc2_handle_session_req_intr() - This interrupt indicates that a device is
303 * initiating the Session Request Protocol to request the host to turn on bus
304 * power so a new session can begin
305 *
306 * @hsotg: Programming view of DWC_otg controller
307 *
308 * This handler responds by turning on bus power. If the DWC_otg controller is
309 * in low power mode, this handler brings the controller out of low power mode
310 * before turning on bus power.
311 */
312static void dwc2_handle_session_req_intr(struct dwc2_hsotg *hsotg)
313{
314 int ret;
315
316 /* Clear interrupt */
317 dwc2_writel(GINTSTS_SESSREQINT, hsotg->regs + GINTSTS);
318
319 dev_dbg(hsotg->dev, "Session request interrupt - lx_state=%d\n",
320 hsotg->lx_state);
321
322 if (dwc2_is_device_mode(hsotg)) {
323 if (hsotg->lx_state == DWC2_L2) {
324 ret = dwc2_exit_hibernation(hsotg, true);
325 if (ret && (ret != -ENOTSUPP))
326 dev_err(hsotg->dev,
327 "exit hibernation failed\n");
328 }
329
330 /*
331 * Report disconnect if there is any previous session
332 * established
333 */
334 dwc2_hsotg_disconnect(hsotg);
335 }
336}
337
338/*
339 * This interrupt indicates that the DWC_otg controller has detected a
340 * resume or remote wakeup sequence. If the DWC_otg controller is in
341 * low power mode, the handler must brings the controller out of low
342 * power mode. The controller automatically begins resume signaling.
343 * The handler schedules a time to stop resume signaling.
344 */
345static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg)
346{
347 int ret;
348
349 /* Clear interrupt */
350 dwc2_writel(GINTSTS_WKUPINT, hsotg->regs + GINTSTS);
351
352 dev_dbg(hsotg->dev, "++Resume or Remote Wakeup Detected Interrupt++\n");
353 dev_dbg(hsotg->dev, "%s lxstate = %d\n", __func__, hsotg->lx_state);
354
355 if (dwc2_is_device_mode(hsotg)) {
356 dev_dbg(hsotg->dev, "DSTS=0x%0x\n",
357 dwc2_readl(hsotg->regs + DSTS));
358 if (hsotg->lx_state == DWC2_L2) {
359 u32 dctl = dwc2_readl(hsotg->regs + DCTL);
360
361 /* Clear Remote Wakeup Signaling */
362 dctl &= ~DCTL_RMTWKUPSIG;
363 dwc2_writel(dctl, hsotg->regs + DCTL);
364 ret = dwc2_exit_hibernation(hsotg, true);
365 if (ret && (ret != -ENOTSUPP))
366 dev_err(hsotg->dev, "exit hibernation failed\n");
367
368 call_gadget(hsotg, resume);
369 }
370 /* Change to L0 state */
371 hsotg->lx_state = DWC2_L0;
372 } else {
373 if (hsotg->params.hibernation)
374 return;
375
376 if (hsotg->lx_state != DWC2_L1) {
377 u32 pcgcctl = dwc2_readl(hsotg->regs + PCGCTL);
378
379 /* Restart the Phy Clock */
380 pcgcctl &= ~PCGCTL_STOPPCLK;
381 dwc2_writel(pcgcctl, hsotg->regs + PCGCTL);
382 mod_timer(&hsotg->wkp_timer,
383 jiffies + msecs_to_jiffies(71));
384 } else {
385 /* Change to L0 state */
386 hsotg->lx_state = DWC2_L0;
387 }
388 }
389}
390
391/*
392 * This interrupt indicates that a device has been disconnected from the
393 * root port
394 */
395static void dwc2_handle_disconnect_intr(struct dwc2_hsotg *hsotg)
396{
397 dwc2_writel(GINTSTS_DISCONNINT, hsotg->regs + GINTSTS);
398
399 dev_dbg(hsotg->dev, "++Disconnect Detected Interrupt++ (%s) %s\n",
400 dwc2_is_host_mode(hsotg) ? "Host" : "Device",
401 dwc2_op_state_str(hsotg));
402
403 if (hsotg->op_state == OTG_STATE_A_HOST)
404 dwc2_hcd_disconnect(hsotg, false);
405}
406
407/*
408 * This interrupt indicates that SUSPEND state has been detected on the USB.
409 *
410 * For HNP the USB Suspend interrupt signals the change from "a_peripheral"
411 * to "a_host".
412 *
413 * When power management is enabled the core will be put in low power mode.
414 */
415static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg)
416{
417 u32 dsts;
418 int ret;
419
420 /* Clear interrupt */
421 dwc2_writel(GINTSTS_USBSUSP, hsotg->regs + GINTSTS);
422
423 dev_dbg(hsotg->dev, "USB SUSPEND\n");
424
425 if (dwc2_is_device_mode(hsotg)) {
426 /*
427 * Check the Device status register to determine if the Suspend
428 * state is active
429 */
430 dsts = dwc2_readl(hsotg->regs + DSTS);
431 dev_dbg(hsotg->dev, "DSTS=0x%0x\n", dsts);
432 dev_dbg(hsotg->dev,
433 "DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d\n",
434 !!(dsts & DSTS_SUSPSTS),
435 hsotg->hw_params.power_optimized);
436 if ((dsts & DSTS_SUSPSTS) && hsotg->hw_params.power_optimized) {
437 /* Ignore suspend request before enumeration */
438 if (!dwc2_is_device_connected(hsotg)) {
439 dev_dbg(hsotg->dev,
440 "ignore suspend request before enumeration\n");
441 return;
442 }
443
444 ret = dwc2_enter_hibernation(hsotg);
445 if (ret) {
446 if (ret != -ENOTSUPP)
447 dev_err(hsotg->dev,
448 "enter hibernation failed\n");
449 goto skip_power_saving;
450 }
451
452 udelay(100);
453
454 /* Ask phy to be suspended */
455 if (!IS_ERR_OR_NULL(hsotg->uphy))
456 usb_phy_set_suspend(hsotg->uphy, true);
457skip_power_saving:
458 /*
459 * Change to L2 (suspend) state before releasing
460 * spinlock
461 */
462 hsotg->lx_state = DWC2_L2;
463
464 /* Call gadget suspend callback */
465 call_gadget(hsotg, suspend);
466 }
467 } else {
468 if (hsotg->op_state == OTG_STATE_A_PERIPHERAL) {
469 dev_dbg(hsotg->dev, "a_peripheral->a_host\n");
470
471 /* Change to L2 (suspend) state */
472 hsotg->lx_state = DWC2_L2;
473 /* Clear the a_peripheral flag, back to a_host */
474 spin_unlock(&hsotg->lock);
475 dwc2_hcd_start(hsotg);
476 spin_lock(&hsotg->lock);
477 hsotg->op_state = OTG_STATE_A_HOST;
478 }
479 }
480}
481
482#define GINTMSK_COMMON (GINTSTS_WKUPINT | GINTSTS_SESSREQINT | \
483 GINTSTS_CONIDSTSCHNG | GINTSTS_OTGINT | \
484 GINTSTS_MODEMIS | GINTSTS_DISCONNINT | \
485 GINTSTS_USBSUSP | GINTSTS_PRTINT)
486
487/*
488 * This function returns the Core Interrupt register
489 */
490static u32 dwc2_read_common_intr(struct dwc2_hsotg *hsotg)
491{
492 u32 gintsts;
493 u32 gintmsk;
494 u32 gahbcfg;
495 u32 gintmsk_common = GINTMSK_COMMON;
496
497 gintsts = dwc2_readl(hsotg->regs + GINTSTS);
498 gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
499 gahbcfg = dwc2_readl(hsotg->regs + GAHBCFG);
500
501 /* If any common interrupts set */
502 if (gintsts & gintmsk_common)
503 dev_dbg(hsotg->dev, "gintsts=%08x gintmsk=%08x\n",
504 gintsts, gintmsk);
505
506 if (gahbcfg & GAHBCFG_GLBL_INTR_EN)
507 return gintsts & gintmsk & gintmsk_common;
508 else
509 return 0;
510}
511
512/*
513 * Common interrupt handler
514 *
515 * The common interrupts are those that occur in both Host and Device mode.
516 * This handler handles the following interrupts:
517 * - Mode Mismatch Interrupt
518 * - OTG Interrupt
519 * - Connector ID Status Change Interrupt
520 * - Disconnect Interrupt
521 * - Session Request Interrupt
522 * - Resume / Remote Wakeup Detected Interrupt
523 * - Suspend Interrupt
524 */
525irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
526{
527 struct dwc2_hsotg *hsotg = dev;
528 u32 gintsts;
529 irqreturn_t retval = IRQ_NONE;
530
531 spin_lock(&hsotg->lock);
532
533 if (!dwc2_is_controller_alive(hsotg)) {
534 dev_warn(hsotg->dev, "Controller is dead\n");
535 goto out;
536 }
537
538 gintsts = dwc2_read_common_intr(hsotg);
539 if (gintsts & ~GINTSTS_PRTINT)
540 retval = IRQ_HANDLED;
541
542 if (gintsts & GINTSTS_MODEMIS)
543 dwc2_handle_mode_mismatch_intr(hsotg);
544 if (gintsts & GINTSTS_OTGINT)
545 dwc2_handle_otg_intr(hsotg);
546 if (gintsts & GINTSTS_CONIDSTSCHNG)
547 dwc2_handle_conn_id_status_change_intr(hsotg);
548 if (gintsts & GINTSTS_DISCONNINT)
549 dwc2_handle_disconnect_intr(hsotg);
550 if (gintsts & GINTSTS_SESSREQINT)
551 dwc2_handle_session_req_intr(hsotg);
552 if (gintsts & GINTSTS_WKUPINT)
553 dwc2_handle_wakeup_detected_intr(hsotg);
554 if (gintsts & GINTSTS_USBSUSP)
555 dwc2_handle_usb_suspend_intr(hsotg);
556
557 if (gintsts & GINTSTS_PRTINT) {
558 /*
559 * The port interrupt occurs while in device mode with HPRT0
560 * Port Enable/Disable
561 */
562 if (dwc2_is_device_mode(hsotg)) {
563 dev_dbg(hsotg->dev,
564 " --Port interrupt received in Device mode--\n");
565 dwc2_handle_usb_port_intr(hsotg);
566 retval = IRQ_HANDLED;
567 }
568 }
569
570out:
571 spin_unlock(&hsotg->lock);
572 return retval;
573}