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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * core.c - ChipIdea USB IP core family device controller
4 *
5 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
6 * Copyright (C) 2020 NXP
7 *
8 * Author: David Lopo
9 * Peter Chen <peter.chen@nxp.com>
10 *
11 * Main Features:
12 * - Four transfers are supported, usbtest is passed
13 * - USB Certification for gadget: CH9 and Mass Storage are passed
14 * - Low power mode
15 * - USB wakeup
16 */
17#include <linux/delay.h>
18#include <linux/device.h>
19#include <linux/dma-mapping.h>
20#include <linux/extcon.h>
21#include <linux/phy/phy.h>
22#include <linux/platform_device.h>
23#include <linux/module.h>
24#include <linux/idr.h>
25#include <linux/interrupt.h>
26#include <linux/io.h>
27#include <linux/kernel.h>
28#include <linux/slab.h>
29#include <linux/pm_runtime.h>
30#include <linux/pinctrl/consumer.h>
31#include <linux/usb/ch9.h>
32#include <linux/usb/gadget.h>
33#include <linux/usb/otg.h>
34#include <linux/usb/chipidea.h>
35#include <linux/usb/of.h>
36#include <linux/of.h>
37#include <linux/regulator/consumer.h>
38#include <linux/usb/ehci_def.h>
39
40#include "ci.h"
41#include "udc.h"
42#include "bits.h"
43#include "host.h"
44#include "otg.h"
45#include "otg_fsm.h"
46
47/* Controller register map */
48static const u8 ci_regs_nolpm[] = {
49 [CAP_CAPLENGTH] = 0x00U,
50 [CAP_HCCPARAMS] = 0x08U,
51 [CAP_DCCPARAMS] = 0x24U,
52 [CAP_TESTMODE] = 0x38U,
53 [OP_USBCMD] = 0x00U,
54 [OP_USBSTS] = 0x04U,
55 [OP_USBINTR] = 0x08U,
56 [OP_FRINDEX] = 0x0CU,
57 [OP_DEVICEADDR] = 0x14U,
58 [OP_ENDPTLISTADDR] = 0x18U,
59 [OP_TTCTRL] = 0x1CU,
60 [OP_BURSTSIZE] = 0x20U,
61 [OP_ULPI_VIEWPORT] = 0x30U,
62 [OP_PORTSC] = 0x44U,
63 [OP_DEVLC] = 0x84U,
64 [OP_OTGSC] = 0x64U,
65 [OP_USBMODE] = 0x68U,
66 [OP_ENDPTSETUPSTAT] = 0x6CU,
67 [OP_ENDPTPRIME] = 0x70U,
68 [OP_ENDPTFLUSH] = 0x74U,
69 [OP_ENDPTSTAT] = 0x78U,
70 [OP_ENDPTCOMPLETE] = 0x7CU,
71 [OP_ENDPTCTRL] = 0x80U,
72};
73
74static const u8 ci_regs_lpm[] = {
75 [CAP_CAPLENGTH] = 0x00U,
76 [CAP_HCCPARAMS] = 0x08U,
77 [CAP_DCCPARAMS] = 0x24U,
78 [CAP_TESTMODE] = 0xFCU,
79 [OP_USBCMD] = 0x00U,
80 [OP_USBSTS] = 0x04U,
81 [OP_USBINTR] = 0x08U,
82 [OP_FRINDEX] = 0x0CU,
83 [OP_DEVICEADDR] = 0x14U,
84 [OP_ENDPTLISTADDR] = 0x18U,
85 [OP_TTCTRL] = 0x1CU,
86 [OP_BURSTSIZE] = 0x20U,
87 [OP_ULPI_VIEWPORT] = 0x30U,
88 [OP_PORTSC] = 0x44U,
89 [OP_DEVLC] = 0x84U,
90 [OP_OTGSC] = 0xC4U,
91 [OP_USBMODE] = 0xC8U,
92 [OP_ENDPTSETUPSTAT] = 0xD8U,
93 [OP_ENDPTPRIME] = 0xDCU,
94 [OP_ENDPTFLUSH] = 0xE0U,
95 [OP_ENDPTSTAT] = 0xE4U,
96 [OP_ENDPTCOMPLETE] = 0xE8U,
97 [OP_ENDPTCTRL] = 0xECU,
98};
99
100static void hw_alloc_regmap(struct ci_hdrc *ci, bool is_lpm)
101{
102 int i;
103
104 for (i = 0; i < OP_ENDPTCTRL; i++)
105 ci->hw_bank.regmap[i] =
106 (i <= CAP_LAST ? ci->hw_bank.cap : ci->hw_bank.op) +
107 (is_lpm ? ci_regs_lpm[i] : ci_regs_nolpm[i]);
108
109 for (; i <= OP_LAST; i++)
110 ci->hw_bank.regmap[i] = ci->hw_bank.op +
111 4 * (i - OP_ENDPTCTRL) +
112 (is_lpm
113 ? ci_regs_lpm[OP_ENDPTCTRL]
114 : ci_regs_nolpm[OP_ENDPTCTRL]);
115
116}
117
118static enum ci_revision ci_get_revision(struct ci_hdrc *ci)
119{
120 int ver = hw_read_id_reg(ci, ID_ID, VERSION) >> __ffs(VERSION);
121 enum ci_revision rev = CI_REVISION_UNKNOWN;
122
123 if (ver == 0x2) {
124 rev = hw_read_id_reg(ci, ID_ID, REVISION)
125 >> __ffs(REVISION);
126 rev += CI_REVISION_20;
127 } else if (ver == 0x0) {
128 rev = CI_REVISION_1X;
129 }
130
131 return rev;
132}
133
134/**
135 * hw_read_intr_enable: returns interrupt enable register
136 *
137 * @ci: the controller
138 *
139 * This function returns register data
140 */
141u32 hw_read_intr_enable(struct ci_hdrc *ci)
142{
143 return hw_read(ci, OP_USBINTR, ~0);
144}
145
146/**
147 * hw_read_intr_status: returns interrupt status register
148 *
149 * @ci: the controller
150 *
151 * This function returns register data
152 */
153u32 hw_read_intr_status(struct ci_hdrc *ci)
154{
155 return hw_read(ci, OP_USBSTS, ~0);
156}
157
158/**
159 * hw_port_test_set: writes port test mode (execute without interruption)
160 * @ci: the controller
161 * @mode: new value
162 *
163 * This function returns an error code
164 */
165int hw_port_test_set(struct ci_hdrc *ci, u8 mode)
166{
167 const u8 TEST_MODE_MAX = 7;
168
169 if (mode > TEST_MODE_MAX)
170 return -EINVAL;
171
172 hw_write(ci, OP_PORTSC, PORTSC_PTC, mode << __ffs(PORTSC_PTC));
173 return 0;
174}
175
176/**
177 * hw_port_test_get: reads port test mode value
178 *
179 * @ci: the controller
180 *
181 * This function returns port test mode value
182 */
183u8 hw_port_test_get(struct ci_hdrc *ci)
184{
185 return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> __ffs(PORTSC_PTC);
186}
187
188static void hw_wait_phy_stable(void)
189{
190 /*
191 * The phy needs some delay to output the stable status from low
192 * power mode. And for OTGSC, the status inputs are debounced
193 * using a 1 ms time constant, so, delay 2ms for controller to get
194 * the stable status, like vbus and id when the phy leaves low power.
195 */
196 usleep_range(2000, 2500);
197}
198
199/* The PHY enters/leaves low power mode */
200static void ci_hdrc_enter_lpm_common(struct ci_hdrc *ci, bool enable)
201{
202 enum ci_hw_regs reg = ci->hw_bank.lpm ? OP_DEVLC : OP_PORTSC;
203 bool lpm = !!(hw_read(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm)));
204
205 if (enable && !lpm)
206 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
207 PORTSC_PHCD(ci->hw_bank.lpm));
208 else if (!enable && lpm)
209 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
210 0);
211}
212
213static void ci_hdrc_enter_lpm(struct ci_hdrc *ci, bool enable)
214{
215 return ci->platdata->enter_lpm(ci, enable);
216}
217
218static int hw_device_init(struct ci_hdrc *ci, void __iomem *base)
219{
220 u32 reg;
221
222 /* bank is a module variable */
223 ci->hw_bank.abs = base;
224
225 ci->hw_bank.cap = ci->hw_bank.abs;
226 ci->hw_bank.cap += ci->platdata->capoffset;
227 ci->hw_bank.op = ci->hw_bank.cap + (ioread32(ci->hw_bank.cap) & 0xff);
228
229 hw_alloc_regmap(ci, false);
230 reg = hw_read(ci, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
231 __ffs(HCCPARAMS_LEN);
232 ci->hw_bank.lpm = reg;
233 if (reg)
234 hw_alloc_regmap(ci, !!reg);
235 ci->hw_bank.size = ci->hw_bank.op - ci->hw_bank.abs;
236 ci->hw_bank.size += OP_LAST;
237 ci->hw_bank.size /= sizeof(u32);
238
239 reg = hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
240 __ffs(DCCPARAMS_DEN);
241 ci->hw_ep_max = reg * 2; /* cache hw ENDPT_MAX */
242
243 if (ci->hw_ep_max > ENDPT_MAX)
244 return -ENODEV;
245
246 ci_hdrc_enter_lpm(ci, false);
247
248 /* Disable all interrupts bits */
249 hw_write(ci, OP_USBINTR, 0xffffffff, 0);
250
251 /* Clear all interrupts status bits*/
252 hw_write(ci, OP_USBSTS, 0xffffffff, 0xffffffff);
253
254 ci->rev = ci_get_revision(ci);
255
256 dev_dbg(ci->dev,
257 "revision: %d, lpm: %d; cap: %px op: %px\n",
258 ci->rev, ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
259
260 /* setup lock mode ? */
261
262 /* ENDPTSETUPSTAT is '0' by default */
263
264 /* HCSPARAMS.bf.ppc SHOULD BE zero for device */
265
266 return 0;
267}
268
269void hw_phymode_configure(struct ci_hdrc *ci)
270{
271 u32 portsc, lpm, sts = 0;
272
273 switch (ci->platdata->phy_mode) {
274 case USBPHY_INTERFACE_MODE_UTMI:
275 portsc = PORTSC_PTS(PTS_UTMI);
276 lpm = DEVLC_PTS(PTS_UTMI);
277 break;
278 case USBPHY_INTERFACE_MODE_UTMIW:
279 portsc = PORTSC_PTS(PTS_UTMI) | PORTSC_PTW;
280 lpm = DEVLC_PTS(PTS_UTMI) | DEVLC_PTW;
281 break;
282 case USBPHY_INTERFACE_MODE_ULPI:
283 portsc = PORTSC_PTS(PTS_ULPI);
284 lpm = DEVLC_PTS(PTS_ULPI);
285 break;
286 case USBPHY_INTERFACE_MODE_SERIAL:
287 portsc = PORTSC_PTS(PTS_SERIAL);
288 lpm = DEVLC_PTS(PTS_SERIAL);
289 sts = 1;
290 break;
291 case USBPHY_INTERFACE_MODE_HSIC:
292 portsc = PORTSC_PTS(PTS_HSIC);
293 lpm = DEVLC_PTS(PTS_HSIC);
294 break;
295 default:
296 return;
297 }
298
299 if (ci->hw_bank.lpm) {
300 hw_write(ci, OP_DEVLC, DEVLC_PTS(7) | DEVLC_PTW, lpm);
301 if (sts)
302 hw_write(ci, OP_DEVLC, DEVLC_STS, DEVLC_STS);
303 } else {
304 hw_write(ci, OP_PORTSC, PORTSC_PTS(7) | PORTSC_PTW, portsc);
305 if (sts)
306 hw_write(ci, OP_PORTSC, PORTSC_STS, PORTSC_STS);
307 }
308}
309EXPORT_SYMBOL_GPL(hw_phymode_configure);
310
311/**
312 * _ci_usb_phy_init: initialize phy taking in account both phy and usb_phy
313 * interfaces
314 * @ci: the controller
315 *
316 * This function returns an error code if the phy failed to init
317 */
318static int _ci_usb_phy_init(struct ci_hdrc *ci)
319{
320 int ret;
321
322 if (ci->phy) {
323 ret = phy_init(ci->phy);
324 if (ret)
325 return ret;
326
327 ret = phy_power_on(ci->phy);
328 if (ret) {
329 phy_exit(ci->phy);
330 return ret;
331 }
332 } else {
333 ret = usb_phy_init(ci->usb_phy);
334 }
335
336 return ret;
337}
338
339/**
340 * ci_usb_phy_exit: deinitialize phy taking in account both phy and usb_phy
341 * interfaces
342 * @ci: the controller
343 */
344static void ci_usb_phy_exit(struct ci_hdrc *ci)
345{
346 if (ci->platdata->flags & CI_HDRC_OVERRIDE_PHY_CONTROL)
347 return;
348
349 if (ci->phy) {
350 phy_power_off(ci->phy);
351 phy_exit(ci->phy);
352 } else {
353 usb_phy_shutdown(ci->usb_phy);
354 }
355}
356
357/**
358 * ci_usb_phy_init: initialize phy according to different phy type
359 * @ci: the controller
360 *
361 * This function returns an error code if usb_phy_init has failed
362 */
363static int ci_usb_phy_init(struct ci_hdrc *ci)
364{
365 int ret;
366
367 if (ci->platdata->flags & CI_HDRC_OVERRIDE_PHY_CONTROL)
368 return 0;
369
370 switch (ci->platdata->phy_mode) {
371 case USBPHY_INTERFACE_MODE_UTMI:
372 case USBPHY_INTERFACE_MODE_UTMIW:
373 case USBPHY_INTERFACE_MODE_HSIC:
374 ret = _ci_usb_phy_init(ci);
375 if (!ret)
376 hw_wait_phy_stable();
377 else
378 return ret;
379 hw_phymode_configure(ci);
380 break;
381 case USBPHY_INTERFACE_MODE_ULPI:
382 case USBPHY_INTERFACE_MODE_SERIAL:
383 hw_phymode_configure(ci);
384 ret = _ci_usb_phy_init(ci);
385 if (ret)
386 return ret;
387 break;
388 default:
389 ret = _ci_usb_phy_init(ci);
390 if (!ret)
391 hw_wait_phy_stable();
392 }
393
394 return ret;
395}
396
397
398/**
399 * ci_platform_configure: do controller configure
400 * @ci: the controller
401 *
402 */
403void ci_platform_configure(struct ci_hdrc *ci)
404{
405 bool is_device_mode, is_host_mode;
406
407 is_device_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_DC;
408 is_host_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_HC;
409
410 if (is_device_mode) {
411 phy_set_mode(ci->phy, PHY_MODE_USB_DEVICE);
412
413 if (ci->platdata->flags & CI_HDRC_DISABLE_DEVICE_STREAMING)
414 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS,
415 USBMODE_CI_SDIS);
416 }
417
418 if (is_host_mode) {
419 phy_set_mode(ci->phy, PHY_MODE_USB_HOST);
420
421 if (ci->platdata->flags & CI_HDRC_DISABLE_HOST_STREAMING)
422 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS,
423 USBMODE_CI_SDIS);
424 }
425
426 if (ci->platdata->flags & CI_HDRC_FORCE_FULLSPEED) {
427 if (ci->hw_bank.lpm)
428 hw_write(ci, OP_DEVLC, DEVLC_PFSC, DEVLC_PFSC);
429 else
430 hw_write(ci, OP_PORTSC, PORTSC_PFSC, PORTSC_PFSC);
431 }
432
433 if (ci->platdata->flags & CI_HDRC_SET_NON_ZERO_TTHA)
434 hw_write(ci, OP_TTCTRL, TTCTRL_TTHA_MASK, TTCTRL_TTHA);
435
436 hw_write(ci, OP_USBCMD, 0xff0000, ci->platdata->itc_setting << 16);
437
438 if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
439 hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
440 ci->platdata->ahb_burst_config);
441
442 /* override burst size, take effect only when ahb_burst_config is 0 */
443 if (!hw_read_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK)) {
444 if (ci->platdata->flags & CI_HDRC_OVERRIDE_TX_BURST)
445 hw_write(ci, OP_BURSTSIZE, TX_BURST_MASK,
446 ci->platdata->tx_burst_size << __ffs(TX_BURST_MASK));
447
448 if (ci->platdata->flags & CI_HDRC_OVERRIDE_RX_BURST)
449 hw_write(ci, OP_BURSTSIZE, RX_BURST_MASK,
450 ci->platdata->rx_burst_size);
451 }
452}
453
454/**
455 * hw_controller_reset: do controller reset
456 * @ci: the controller
457 *
458 * This function returns an error code
459 */
460static int hw_controller_reset(struct ci_hdrc *ci)
461{
462 int count = 0;
463
464 hw_write(ci, OP_USBCMD, USBCMD_RST, USBCMD_RST);
465 while (hw_read(ci, OP_USBCMD, USBCMD_RST)) {
466 udelay(10);
467 if (count++ > 1000)
468 return -ETIMEDOUT;
469 }
470
471 return 0;
472}
473
474/**
475 * hw_device_reset: resets chip (execute without interruption)
476 * @ci: the controller
477 *
478 * This function returns an error code
479 */
480int hw_device_reset(struct ci_hdrc *ci)
481{
482 int ret;
483
484 /* should flush & stop before reset */
485 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
486 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
487
488 ret = hw_controller_reset(ci);
489 if (ret) {
490 dev_err(ci->dev, "error resetting controller, ret=%d\n", ret);
491 return ret;
492 }
493
494 if (ci->platdata->notify_event) {
495 ret = ci->platdata->notify_event(ci,
496 CI_HDRC_CONTROLLER_RESET_EVENT);
497 if (ret)
498 return ret;
499 }
500
501 /* USBMODE should be configured step by step */
502 hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
503 hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_DC);
504 /* HW >= 2.3 */
505 hw_write(ci, OP_USBMODE, USBMODE_SLOM, USBMODE_SLOM);
506
507 if (hw_read(ci, OP_USBMODE, USBMODE_CM) != USBMODE_CM_DC) {
508 dev_err(ci->dev, "cannot enter in %s device mode\n",
509 ci_role(ci)->name);
510 dev_err(ci->dev, "lpm = %i\n", ci->hw_bank.lpm);
511 return -ENODEV;
512 }
513
514 ci_platform_configure(ci);
515
516 return 0;
517}
518
519static irqreturn_t ci_irq_handler(int irq, void *data)
520{
521 struct ci_hdrc *ci = data;
522 irqreturn_t ret = IRQ_NONE;
523 u32 otgsc = 0;
524
525 if (ci->in_lpm) {
526 disable_irq_nosync(irq);
527 ci->wakeup_int = true;
528 pm_runtime_get(ci->dev);
529 return IRQ_HANDLED;
530 }
531
532 if (ci->is_otg) {
533 otgsc = hw_read_otgsc(ci, ~0);
534 if (ci_otg_is_fsm_mode(ci)) {
535 ret = ci_otg_fsm_irq(ci);
536 if (ret == IRQ_HANDLED)
537 return ret;
538 }
539 }
540
541 /*
542 * Handle id change interrupt, it indicates device/host function
543 * switch.
544 */
545 if (ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) {
546 ci->id_event = true;
547 /* Clear ID change irq status */
548 hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
549 ci_otg_queue_work(ci);
550 return IRQ_HANDLED;
551 }
552
553 /*
554 * Handle vbus change interrupt, it indicates device connection
555 * and disconnection events.
556 */
557 if (ci->is_otg && (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) {
558 ci->b_sess_valid_event = true;
559 /* Clear BSV irq */
560 hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
561 ci_otg_queue_work(ci);
562 return IRQ_HANDLED;
563 }
564
565 /* Handle device/host interrupt */
566 if (ci->role != CI_ROLE_END)
567 ret = ci_role(ci)->irq(ci);
568
569 return ret;
570}
571
572static void ci_irq(struct ci_hdrc *ci)
573{
574 unsigned long flags;
575
576 local_irq_save(flags);
577 ci_irq_handler(ci->irq, ci);
578 local_irq_restore(flags);
579}
580
581static int ci_cable_notifier(struct notifier_block *nb, unsigned long event,
582 void *ptr)
583{
584 struct ci_hdrc_cable *cbl = container_of(nb, struct ci_hdrc_cable, nb);
585 struct ci_hdrc *ci = cbl->ci;
586
587 cbl->connected = event;
588 cbl->changed = true;
589
590 ci_irq(ci);
591 return NOTIFY_DONE;
592}
593
594static enum usb_role ci_usb_role_switch_get(struct usb_role_switch *sw)
595{
596 struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
597 enum usb_role role;
598 unsigned long flags;
599
600 spin_lock_irqsave(&ci->lock, flags);
601 role = ci_role_to_usb_role(ci);
602 spin_unlock_irqrestore(&ci->lock, flags);
603
604 return role;
605}
606
607static int ci_usb_role_switch_set(struct usb_role_switch *sw,
608 enum usb_role role)
609{
610 struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
611 struct ci_hdrc_cable *cable;
612
613 if (role == USB_ROLE_HOST) {
614 cable = &ci->platdata->id_extcon;
615 cable->changed = true;
616 cable->connected = true;
617 cable = &ci->platdata->vbus_extcon;
618 cable->changed = true;
619 cable->connected = false;
620 } else if (role == USB_ROLE_DEVICE) {
621 cable = &ci->platdata->id_extcon;
622 cable->changed = true;
623 cable->connected = false;
624 cable = &ci->platdata->vbus_extcon;
625 cable->changed = true;
626 cable->connected = true;
627 } else {
628 cable = &ci->platdata->id_extcon;
629 cable->changed = true;
630 cable->connected = false;
631 cable = &ci->platdata->vbus_extcon;
632 cable->changed = true;
633 cable->connected = false;
634 }
635
636 ci_irq(ci);
637 return 0;
638}
639
640static enum ci_role ci_get_role(struct ci_hdrc *ci)
641{
642 enum ci_role role;
643
644 if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
645 if (ci->is_otg) {
646 role = ci_otg_role(ci);
647 hw_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);
648 } else {
649 /*
650 * If the controller is not OTG capable, but support
651 * role switch, the defalt role is gadget, and the
652 * user can switch it through debugfs.
653 */
654 role = CI_ROLE_GADGET;
655 }
656 } else {
657 role = ci->roles[CI_ROLE_HOST] ? CI_ROLE_HOST
658 : CI_ROLE_GADGET;
659 }
660
661 return role;
662}
663
664static struct usb_role_switch_desc ci_role_switch = {
665 .set = ci_usb_role_switch_set,
666 .get = ci_usb_role_switch_get,
667 .allow_userspace_control = true,
668};
669
670static int ci_get_platdata(struct device *dev,
671 struct ci_hdrc_platform_data *platdata)
672{
673 struct extcon_dev *ext_vbus, *ext_id;
674 struct ci_hdrc_cable *cable;
675 int ret;
676
677 if (!platdata->phy_mode)
678 platdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
679
680 if (!platdata->dr_mode)
681 platdata->dr_mode = usb_get_dr_mode(dev);
682
683 if (platdata->dr_mode == USB_DR_MODE_UNKNOWN)
684 platdata->dr_mode = USB_DR_MODE_OTG;
685
686 if (platdata->dr_mode != USB_DR_MODE_PERIPHERAL) {
687 /* Get the vbus regulator */
688 platdata->reg_vbus = devm_regulator_get_optional(dev, "vbus");
689 if (PTR_ERR(platdata->reg_vbus) == -EPROBE_DEFER) {
690 return -EPROBE_DEFER;
691 } else if (PTR_ERR(platdata->reg_vbus) == -ENODEV) {
692 /* no vbus regulator is needed */
693 platdata->reg_vbus = NULL;
694 } else if (IS_ERR(platdata->reg_vbus)) {
695 dev_err(dev, "Getting regulator error: %ld\n",
696 PTR_ERR(platdata->reg_vbus));
697 return PTR_ERR(platdata->reg_vbus);
698 }
699 /* Get TPL support */
700 if (!platdata->tpl_support)
701 platdata->tpl_support =
702 of_usb_host_tpl_support(dev->of_node);
703 }
704
705 if (platdata->dr_mode == USB_DR_MODE_OTG) {
706 /* We can support HNP and SRP of OTG 2.0 */
707 platdata->ci_otg_caps.otg_rev = 0x0200;
708 platdata->ci_otg_caps.hnp_support = true;
709 platdata->ci_otg_caps.srp_support = true;
710
711 /* Update otg capabilities by DT properties */
712 ret = of_usb_update_otg_caps(dev->of_node,
713 &platdata->ci_otg_caps);
714 if (ret)
715 return ret;
716 }
717
718 if (usb_get_maximum_speed(dev) == USB_SPEED_FULL)
719 platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
720
721 of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
722 &platdata->phy_clkgate_delay_us);
723
724 platdata->itc_setting = 1;
725
726 of_property_read_u32(dev->of_node, "itc-setting",
727 &platdata->itc_setting);
728
729 ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
730 &platdata->ahb_burst_config);
731 if (!ret) {
732 platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
733 } else if (ret != -EINVAL) {
734 dev_err(dev, "failed to get ahb-burst-config\n");
735 return ret;
736 }
737
738 ret = of_property_read_u32(dev->of_node, "tx-burst-size-dword",
739 &platdata->tx_burst_size);
740 if (!ret) {
741 platdata->flags |= CI_HDRC_OVERRIDE_TX_BURST;
742 } else if (ret != -EINVAL) {
743 dev_err(dev, "failed to get tx-burst-size-dword\n");
744 return ret;
745 }
746
747 ret = of_property_read_u32(dev->of_node, "rx-burst-size-dword",
748 &platdata->rx_burst_size);
749 if (!ret) {
750 platdata->flags |= CI_HDRC_OVERRIDE_RX_BURST;
751 } else if (ret != -EINVAL) {
752 dev_err(dev, "failed to get rx-burst-size-dword\n");
753 return ret;
754 }
755
756 if (of_find_property(dev->of_node, "non-zero-ttctrl-ttha", NULL))
757 platdata->flags |= CI_HDRC_SET_NON_ZERO_TTHA;
758
759 ext_id = ERR_PTR(-ENODEV);
760 ext_vbus = ERR_PTR(-ENODEV);
761 if (of_property_read_bool(dev->of_node, "extcon")) {
762 /* Each one of them is not mandatory */
763 ext_vbus = extcon_get_edev_by_phandle(dev, 0);
764 if (IS_ERR(ext_vbus) && PTR_ERR(ext_vbus) != -ENODEV)
765 return PTR_ERR(ext_vbus);
766
767 ext_id = extcon_get_edev_by_phandle(dev, 1);
768 if (IS_ERR(ext_id) && PTR_ERR(ext_id) != -ENODEV)
769 return PTR_ERR(ext_id);
770 }
771
772 cable = &platdata->vbus_extcon;
773 cable->nb.notifier_call = ci_cable_notifier;
774 cable->edev = ext_vbus;
775
776 if (!IS_ERR(ext_vbus)) {
777 ret = extcon_get_state(cable->edev, EXTCON_USB);
778 if (ret)
779 cable->connected = true;
780 else
781 cable->connected = false;
782 }
783
784 cable = &platdata->id_extcon;
785 cable->nb.notifier_call = ci_cable_notifier;
786 cable->edev = ext_id;
787
788 if (!IS_ERR(ext_id)) {
789 ret = extcon_get_state(cable->edev, EXTCON_USB_HOST);
790 if (ret)
791 cable->connected = true;
792 else
793 cable->connected = false;
794 }
795
796 if (device_property_read_bool(dev, "usb-role-switch"))
797 ci_role_switch.fwnode = dev->fwnode;
798
799 platdata->pctl = devm_pinctrl_get(dev);
800 if (!IS_ERR(platdata->pctl)) {
801 struct pinctrl_state *p;
802
803 p = pinctrl_lookup_state(platdata->pctl, "default");
804 if (!IS_ERR(p))
805 platdata->pins_default = p;
806
807 p = pinctrl_lookup_state(platdata->pctl, "host");
808 if (!IS_ERR(p))
809 platdata->pins_host = p;
810
811 p = pinctrl_lookup_state(platdata->pctl, "device");
812 if (!IS_ERR(p))
813 platdata->pins_device = p;
814 }
815
816 if (!platdata->enter_lpm)
817 platdata->enter_lpm = ci_hdrc_enter_lpm_common;
818
819 return 0;
820}
821
822static int ci_extcon_register(struct ci_hdrc *ci)
823{
824 struct ci_hdrc_cable *id, *vbus;
825 int ret;
826
827 id = &ci->platdata->id_extcon;
828 id->ci = ci;
829 if (!IS_ERR_OR_NULL(id->edev)) {
830 ret = devm_extcon_register_notifier(ci->dev, id->edev,
831 EXTCON_USB_HOST, &id->nb);
832 if (ret < 0) {
833 dev_err(ci->dev, "register ID failed\n");
834 return ret;
835 }
836 }
837
838 vbus = &ci->platdata->vbus_extcon;
839 vbus->ci = ci;
840 if (!IS_ERR_OR_NULL(vbus->edev)) {
841 ret = devm_extcon_register_notifier(ci->dev, vbus->edev,
842 EXTCON_USB, &vbus->nb);
843 if (ret < 0) {
844 dev_err(ci->dev, "register VBUS failed\n");
845 return ret;
846 }
847 }
848
849 return 0;
850}
851
852static DEFINE_IDA(ci_ida);
853
854struct platform_device *ci_hdrc_add_device(struct device *dev,
855 struct resource *res, int nres,
856 struct ci_hdrc_platform_data *platdata)
857{
858 struct platform_device *pdev;
859 int id, ret;
860
861 ret = ci_get_platdata(dev, platdata);
862 if (ret)
863 return ERR_PTR(ret);
864
865 id = ida_simple_get(&ci_ida, 0, 0, GFP_KERNEL);
866 if (id < 0)
867 return ERR_PTR(id);
868
869 pdev = platform_device_alloc("ci_hdrc", id);
870 if (!pdev) {
871 ret = -ENOMEM;
872 goto put_id;
873 }
874
875 pdev->dev.parent = dev;
876 device_set_of_node_from_dev(&pdev->dev, dev);
877
878 ret = platform_device_add_resources(pdev, res, nres);
879 if (ret)
880 goto err;
881
882 ret = platform_device_add_data(pdev, platdata, sizeof(*platdata));
883 if (ret)
884 goto err;
885
886 ret = platform_device_add(pdev);
887 if (ret)
888 goto err;
889
890 return pdev;
891
892err:
893 platform_device_put(pdev);
894put_id:
895 ida_simple_remove(&ci_ida, id);
896 return ERR_PTR(ret);
897}
898EXPORT_SYMBOL_GPL(ci_hdrc_add_device);
899
900void ci_hdrc_remove_device(struct platform_device *pdev)
901{
902 int id = pdev->id;
903 platform_device_unregister(pdev);
904 ida_simple_remove(&ci_ida, id);
905}
906EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
907
908/**
909 * ci_hdrc_query_available_role: get runtime available operation mode
910 *
911 * The glue layer can get current operation mode (host/peripheral/otg)
912 * This function should be called after ci core device has created.
913 *
914 * @pdev: the platform device of ci core.
915 *
916 * Return runtime usb_dr_mode.
917 */
918enum usb_dr_mode ci_hdrc_query_available_role(struct platform_device *pdev)
919{
920 struct ci_hdrc *ci = platform_get_drvdata(pdev);
921
922 if (!ci)
923 return USB_DR_MODE_UNKNOWN;
924 if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])
925 return USB_DR_MODE_OTG;
926 else if (ci->roles[CI_ROLE_HOST])
927 return USB_DR_MODE_HOST;
928 else if (ci->roles[CI_ROLE_GADGET])
929 return USB_DR_MODE_PERIPHERAL;
930 else
931 return USB_DR_MODE_UNKNOWN;
932}
933EXPORT_SYMBOL_GPL(ci_hdrc_query_available_role);
934
935static inline void ci_role_destroy(struct ci_hdrc *ci)
936{
937 ci_hdrc_gadget_destroy(ci);
938 ci_hdrc_host_destroy(ci);
939 if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
940 ci_hdrc_otg_destroy(ci);
941}
942
943static void ci_get_otg_capable(struct ci_hdrc *ci)
944{
945 if (ci->platdata->flags & CI_HDRC_DUAL_ROLE_NOT_OTG)
946 ci->is_otg = false;
947 else
948 ci->is_otg = (hw_read(ci, CAP_DCCPARAMS,
949 DCCPARAMS_DC | DCCPARAMS_HC)
950 == (DCCPARAMS_DC | DCCPARAMS_HC));
951 if (ci->is_otg) {
952 dev_dbg(ci->dev, "It is OTG capable controller\n");
953 /* Disable and clear all OTG irq */
954 hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
955 OTGSC_INT_STATUS_BITS);
956 }
957}
958
959static ssize_t role_show(struct device *dev, struct device_attribute *attr,
960 char *buf)
961{
962 struct ci_hdrc *ci = dev_get_drvdata(dev);
963
964 if (ci->role != CI_ROLE_END)
965 return sprintf(buf, "%s\n", ci_role(ci)->name);
966
967 return 0;
968}
969
970static ssize_t role_store(struct device *dev,
971 struct device_attribute *attr, const char *buf, size_t n)
972{
973 struct ci_hdrc *ci = dev_get_drvdata(dev);
974 enum ci_role role;
975 int ret;
976
977 if (!(ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])) {
978 dev_warn(dev, "Current configuration is not dual-role, quit\n");
979 return -EPERM;
980 }
981
982 for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
983 if (!strncmp(buf, ci->roles[role]->name,
984 strlen(ci->roles[role]->name)))
985 break;
986
987 if (role == CI_ROLE_END || role == ci->role)
988 return -EINVAL;
989
990 pm_runtime_get_sync(dev);
991 disable_irq(ci->irq);
992 ci_role_stop(ci);
993 ret = ci_role_start(ci, role);
994 if (!ret && ci->role == CI_ROLE_GADGET)
995 ci_handle_vbus_change(ci);
996 enable_irq(ci->irq);
997 pm_runtime_put_sync(dev);
998
999 return (ret == 0) ? n : ret;
1000}
1001static DEVICE_ATTR_RW(role);
1002
1003static struct attribute *ci_attrs[] = {
1004 &dev_attr_role.attr,
1005 NULL,
1006};
1007ATTRIBUTE_GROUPS(ci);
1008
1009static int ci_hdrc_probe(struct platform_device *pdev)
1010{
1011 struct device *dev = &pdev->dev;
1012 struct ci_hdrc *ci;
1013 struct resource *res;
1014 void __iomem *base;
1015 int ret;
1016 enum usb_dr_mode dr_mode;
1017
1018 if (!dev_get_platdata(dev)) {
1019 dev_err(dev, "platform data missing\n");
1020 return -ENODEV;
1021 }
1022
1023 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1024 base = devm_ioremap_resource(dev, res);
1025 if (IS_ERR(base))
1026 return PTR_ERR(base);
1027
1028 ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
1029 if (!ci)
1030 return -ENOMEM;
1031
1032 spin_lock_init(&ci->lock);
1033 ci->dev = dev;
1034 ci->platdata = dev_get_platdata(dev);
1035 ci->imx28_write_fix = !!(ci->platdata->flags &
1036 CI_HDRC_IMX28_WRITE_FIX);
1037 ci->supports_runtime_pm = !!(ci->platdata->flags &
1038 CI_HDRC_SUPPORTS_RUNTIME_PM);
1039 platform_set_drvdata(pdev, ci);
1040
1041 ret = hw_device_init(ci, base);
1042 if (ret < 0) {
1043 dev_err(dev, "can't initialize hardware\n");
1044 return -ENODEV;
1045 }
1046
1047 ret = ci_ulpi_init(ci);
1048 if (ret)
1049 return ret;
1050
1051 if (ci->platdata->phy) {
1052 ci->phy = ci->platdata->phy;
1053 } else if (ci->platdata->usb_phy) {
1054 ci->usb_phy = ci->platdata->usb_phy;
1055 } else {
1056 /* Look for a generic PHY first */
1057 ci->phy = devm_phy_get(dev->parent, "usb-phy");
1058
1059 if (PTR_ERR(ci->phy) == -EPROBE_DEFER) {
1060 ret = -EPROBE_DEFER;
1061 goto ulpi_exit;
1062 } else if (IS_ERR(ci->phy)) {
1063 ci->phy = NULL;
1064 }
1065
1066 /* Look for a legacy USB PHY from device-tree next */
1067 if (!ci->phy) {
1068 ci->usb_phy = devm_usb_get_phy_by_phandle(dev->parent,
1069 "phys", 0);
1070
1071 if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1072 ret = -EPROBE_DEFER;
1073 goto ulpi_exit;
1074 } else if (IS_ERR(ci->usb_phy)) {
1075 ci->usb_phy = NULL;
1076 }
1077 }
1078
1079 /* Look for any registered legacy USB PHY as last resort */
1080 if (!ci->phy && !ci->usb_phy) {
1081 ci->usb_phy = devm_usb_get_phy(dev->parent,
1082 USB_PHY_TYPE_USB2);
1083
1084 if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1085 ret = -EPROBE_DEFER;
1086 goto ulpi_exit;
1087 } else if (IS_ERR(ci->usb_phy)) {
1088 ci->usb_phy = NULL;
1089 }
1090 }
1091
1092 /* No USB PHY was found in the end */
1093 if (!ci->phy && !ci->usb_phy) {
1094 ret = -ENXIO;
1095 goto ulpi_exit;
1096 }
1097 }
1098
1099 ret = ci_usb_phy_init(ci);
1100 if (ret) {
1101 dev_err(dev, "unable to init phy: %d\n", ret);
1102 return ret;
1103 }
1104
1105 ci->hw_bank.phys = res->start;
1106
1107 ci->irq = platform_get_irq(pdev, 0);
1108 if (ci->irq < 0) {
1109 ret = ci->irq;
1110 goto deinit_phy;
1111 }
1112
1113 ci_get_otg_capable(ci);
1114
1115 dr_mode = ci->platdata->dr_mode;
1116 /* initialize role(s) before the interrupt is requested */
1117 if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
1118 ret = ci_hdrc_host_init(ci);
1119 if (ret) {
1120 if (ret == -ENXIO)
1121 dev_info(dev, "doesn't support host\n");
1122 else
1123 goto deinit_phy;
1124 }
1125 }
1126
1127 if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
1128 ret = ci_hdrc_gadget_init(ci);
1129 if (ret) {
1130 if (ret == -ENXIO)
1131 dev_info(dev, "doesn't support gadget\n");
1132 else
1133 goto deinit_host;
1134 }
1135 }
1136
1137 if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
1138 dev_err(dev, "no supported roles\n");
1139 ret = -ENODEV;
1140 goto deinit_gadget;
1141 }
1142
1143 if (ci->is_otg && ci->roles[CI_ROLE_GADGET]) {
1144 ret = ci_hdrc_otg_init(ci);
1145 if (ret) {
1146 dev_err(dev, "init otg fails, ret = %d\n", ret);
1147 goto deinit_gadget;
1148 }
1149 }
1150
1151 if (ci_role_switch.fwnode) {
1152 ci_role_switch.driver_data = ci;
1153 ci->role_switch = usb_role_switch_register(dev,
1154 &ci_role_switch);
1155 if (IS_ERR(ci->role_switch)) {
1156 ret = PTR_ERR(ci->role_switch);
1157 goto deinit_otg;
1158 }
1159 }
1160
1161 ci->role = ci_get_role(ci);
1162 if (!ci_otg_is_fsm_mode(ci)) {
1163 /* only update vbus status for peripheral */
1164 if (ci->role == CI_ROLE_GADGET) {
1165 /* Pull down DP for possible charger detection */
1166 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1167 ci_handle_vbus_change(ci);
1168 }
1169
1170 ret = ci_role_start(ci, ci->role);
1171 if (ret) {
1172 dev_err(dev, "can't start %s role\n",
1173 ci_role(ci)->name);
1174 goto stop;
1175 }
1176 }
1177
1178 ret = devm_request_irq(dev, ci->irq, ci_irq_handler, IRQF_SHARED,
1179 ci->platdata->name, ci);
1180 if (ret)
1181 goto stop;
1182
1183 ret = ci_extcon_register(ci);
1184 if (ret)
1185 goto stop;
1186
1187 if (ci->supports_runtime_pm) {
1188 pm_runtime_set_active(&pdev->dev);
1189 pm_runtime_enable(&pdev->dev);
1190 pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
1191 pm_runtime_mark_last_busy(ci->dev);
1192 pm_runtime_use_autosuspend(&pdev->dev);
1193 }
1194
1195 if (ci_otg_is_fsm_mode(ci))
1196 ci_hdrc_otg_fsm_start(ci);
1197
1198 device_set_wakeup_capable(&pdev->dev, true);
1199 dbg_create_files(ci);
1200
1201 return 0;
1202
1203stop:
1204 if (ci->role_switch)
1205 usb_role_switch_unregister(ci->role_switch);
1206deinit_otg:
1207 if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
1208 ci_hdrc_otg_destroy(ci);
1209deinit_gadget:
1210 ci_hdrc_gadget_destroy(ci);
1211deinit_host:
1212 ci_hdrc_host_destroy(ci);
1213deinit_phy:
1214 ci_usb_phy_exit(ci);
1215ulpi_exit:
1216 ci_ulpi_exit(ci);
1217
1218 return ret;
1219}
1220
1221static int ci_hdrc_remove(struct platform_device *pdev)
1222{
1223 struct ci_hdrc *ci = platform_get_drvdata(pdev);
1224
1225 if (ci->role_switch)
1226 usb_role_switch_unregister(ci->role_switch);
1227
1228 if (ci->supports_runtime_pm) {
1229 pm_runtime_get_sync(&pdev->dev);
1230 pm_runtime_disable(&pdev->dev);
1231 pm_runtime_put_noidle(&pdev->dev);
1232 }
1233
1234 dbg_remove_files(ci);
1235 ci_role_destroy(ci);
1236 ci_hdrc_enter_lpm(ci, true);
1237 ci_usb_phy_exit(ci);
1238 ci_ulpi_exit(ci);
1239
1240 return 0;
1241}
1242
1243#ifdef CONFIG_PM
1244/* Prepare wakeup by SRP before suspend */
1245static void ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
1246{
1247 if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1248 !hw_read_otgsc(ci, OTGSC_ID)) {
1249 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
1250 PORTSC_PP);
1251 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_WKCN,
1252 PORTSC_WKCN);
1253 }
1254}
1255
1256/* Handle SRP when wakeup by data pulse */
1257static void ci_otg_fsm_wakeup_by_srp(struct ci_hdrc *ci)
1258{
1259 if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1260 (ci->fsm.a_bus_drop == 1) && (ci->fsm.a_bus_req == 0)) {
1261 if (!hw_read_otgsc(ci, OTGSC_ID)) {
1262 ci->fsm.a_srp_det = 1;
1263 ci->fsm.a_bus_drop = 0;
1264 } else {
1265 ci->fsm.id = 1;
1266 }
1267 ci_otg_queue_work(ci);
1268 }
1269}
1270
1271static void ci_controller_suspend(struct ci_hdrc *ci)
1272{
1273 disable_irq(ci->irq);
1274 ci_hdrc_enter_lpm(ci, true);
1275 if (ci->platdata->phy_clkgate_delay_us)
1276 usleep_range(ci->platdata->phy_clkgate_delay_us,
1277 ci->platdata->phy_clkgate_delay_us + 50);
1278 usb_phy_set_suspend(ci->usb_phy, 1);
1279 ci->in_lpm = true;
1280 enable_irq(ci->irq);
1281}
1282
1283/*
1284 * Handle the wakeup interrupt triggered by extcon connector
1285 * We need to call ci_irq again for extcon since the first
1286 * interrupt (wakeup int) only let the controller be out of
1287 * low power mode, but not handle any interrupts.
1288 */
1289static void ci_extcon_wakeup_int(struct ci_hdrc *ci)
1290{
1291 struct ci_hdrc_cable *cable_id, *cable_vbus;
1292 u32 otgsc = hw_read_otgsc(ci, ~0);
1293
1294 cable_id = &ci->platdata->id_extcon;
1295 cable_vbus = &ci->platdata->vbus_extcon;
1296
1297 if ((!IS_ERR(cable_id->edev) || ci->role_switch)
1298 && ci->is_otg &&
1299 (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS))
1300 ci_irq(ci);
1301
1302 if ((!IS_ERR(cable_vbus->edev) || ci->role_switch)
1303 && ci->is_otg &&
1304 (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS))
1305 ci_irq(ci);
1306}
1307
1308static int ci_controller_resume(struct device *dev)
1309{
1310 struct ci_hdrc *ci = dev_get_drvdata(dev);
1311 int ret;
1312
1313 dev_dbg(dev, "at %s\n", __func__);
1314
1315 if (!ci->in_lpm) {
1316 WARN_ON(1);
1317 return 0;
1318 }
1319
1320 ci_hdrc_enter_lpm(ci, false);
1321
1322 ret = ci_ulpi_resume(ci);
1323 if (ret)
1324 return ret;
1325
1326 if (ci->usb_phy) {
1327 usb_phy_set_suspend(ci->usb_phy, 0);
1328 usb_phy_set_wakeup(ci->usb_phy, false);
1329 hw_wait_phy_stable();
1330 }
1331
1332 ci->in_lpm = false;
1333 if (ci->wakeup_int) {
1334 ci->wakeup_int = false;
1335 pm_runtime_mark_last_busy(ci->dev);
1336 pm_runtime_put_autosuspend(ci->dev);
1337 enable_irq(ci->irq);
1338 if (ci_otg_is_fsm_mode(ci))
1339 ci_otg_fsm_wakeup_by_srp(ci);
1340 ci_extcon_wakeup_int(ci);
1341 }
1342
1343 return 0;
1344}
1345
1346#ifdef CONFIG_PM_SLEEP
1347static int ci_suspend(struct device *dev)
1348{
1349 struct ci_hdrc *ci = dev_get_drvdata(dev);
1350
1351 if (ci->wq)
1352 flush_workqueue(ci->wq);
1353 /*
1354 * Controller needs to be active during suspend, otherwise the core
1355 * may run resume when the parent is at suspend if other driver's
1356 * suspend fails, it occurs before parent's suspend has not started,
1357 * but the core suspend has finished.
1358 */
1359 if (ci->in_lpm)
1360 pm_runtime_resume(dev);
1361
1362 if (ci->in_lpm) {
1363 WARN_ON(1);
1364 return 0;
1365 }
1366
1367 /* Extra routine per role before system suspend */
1368 if (ci->role != CI_ROLE_END && ci_role(ci)->suspend)
1369 ci_role(ci)->suspend(ci);
1370
1371 if (device_may_wakeup(dev)) {
1372 if (ci_otg_is_fsm_mode(ci))
1373 ci_otg_fsm_suspend_for_srp(ci);
1374
1375 usb_phy_set_wakeup(ci->usb_phy, true);
1376 enable_irq_wake(ci->irq);
1377 }
1378
1379 ci_controller_suspend(ci);
1380
1381 return 0;
1382}
1383
1384static void ci_handle_power_lost(struct ci_hdrc *ci)
1385{
1386 enum ci_role role;
1387
1388 disable_irq_nosync(ci->irq);
1389 if (!ci_otg_is_fsm_mode(ci)) {
1390 role = ci_get_role(ci);
1391
1392 if (ci->role != role) {
1393 ci_handle_id_switch(ci);
1394 } else if (role == CI_ROLE_GADGET) {
1395 if (ci->is_otg && hw_read_otgsc(ci, OTGSC_BSV))
1396 usb_gadget_vbus_connect(&ci->gadget);
1397 }
1398 }
1399
1400 enable_irq(ci->irq);
1401}
1402
1403static int ci_resume(struct device *dev)
1404{
1405 struct ci_hdrc *ci = dev_get_drvdata(dev);
1406 bool power_lost;
1407 int ret;
1408
1409 /* Since ASYNCLISTADDR (host mode) and ENDPTLISTADDR (device
1410 * mode) share the same register address. We can check if
1411 * controller resume from power lost based on this address
1412 * due to this register will be reset after power lost.
1413 */
1414 power_lost = !hw_read(ci, OP_ENDPTLISTADDR, ~0);
1415
1416 if (device_may_wakeup(dev))
1417 disable_irq_wake(ci->irq);
1418
1419 ret = ci_controller_resume(dev);
1420 if (ret)
1421 return ret;
1422
1423 if (power_lost) {
1424 /* shutdown and re-init for phy */
1425 ci_usb_phy_exit(ci);
1426 ci_usb_phy_init(ci);
1427 }
1428
1429 /* Extra routine per role after system resume */
1430 if (ci->role != CI_ROLE_END && ci_role(ci)->resume)
1431 ci_role(ci)->resume(ci, power_lost);
1432
1433 if (power_lost)
1434 ci_handle_power_lost(ci);
1435
1436 if (ci->supports_runtime_pm) {
1437 pm_runtime_disable(dev);
1438 pm_runtime_set_active(dev);
1439 pm_runtime_enable(dev);
1440 }
1441
1442 return ret;
1443}
1444#endif /* CONFIG_PM_SLEEP */
1445
1446static int ci_runtime_suspend(struct device *dev)
1447{
1448 struct ci_hdrc *ci = dev_get_drvdata(dev);
1449
1450 dev_dbg(dev, "at %s\n", __func__);
1451
1452 if (ci->in_lpm) {
1453 WARN_ON(1);
1454 return 0;
1455 }
1456
1457 if (ci_otg_is_fsm_mode(ci))
1458 ci_otg_fsm_suspend_for_srp(ci);
1459
1460 usb_phy_set_wakeup(ci->usb_phy, true);
1461 ci_controller_suspend(ci);
1462
1463 return 0;
1464}
1465
1466static int ci_runtime_resume(struct device *dev)
1467{
1468 return ci_controller_resume(dev);
1469}
1470
1471#endif /* CONFIG_PM */
1472static const struct dev_pm_ops ci_pm_ops = {
1473 SET_SYSTEM_SLEEP_PM_OPS(ci_suspend, ci_resume)
1474 SET_RUNTIME_PM_OPS(ci_runtime_suspend, ci_runtime_resume, NULL)
1475};
1476
1477static struct platform_driver ci_hdrc_driver = {
1478 .probe = ci_hdrc_probe,
1479 .remove = ci_hdrc_remove,
1480 .driver = {
1481 .name = "ci_hdrc",
1482 .pm = &ci_pm_ops,
1483 .dev_groups = ci_groups,
1484 },
1485};
1486
1487static int __init ci_hdrc_platform_register(void)
1488{
1489 ci_hdrc_host_driver_init();
1490 return platform_driver_register(&ci_hdrc_driver);
1491}
1492module_init(ci_hdrc_platform_register);
1493
1494static void __exit ci_hdrc_platform_unregister(void)
1495{
1496 platform_driver_unregister(&ci_hdrc_driver);
1497}
1498module_exit(ci_hdrc_platform_unregister);
1499
1500MODULE_ALIAS("platform:ci_hdrc");
1501MODULE_LICENSE("GPL v2");
1502MODULE_AUTHOR("David Lopo <dlopo@chipidea.mips.com>");
1503MODULE_DESCRIPTION("ChipIdea HDRC Driver");