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 */
48 static 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
74 static 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
hw_alloc_regmap(struct ci_hdrc * ci,bool is_lpm)100 static 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
ci_get_revision(struct ci_hdrc * ci)118 static 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 */
hw_read_intr_enable(struct ci_hdrc * ci)141 u32 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 */
hw_read_intr_status(struct ci_hdrc * ci)153 u32 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 */
hw_port_test_set(struct ci_hdrc * ci,u8 mode)165 int 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 */
hw_port_test_get(struct ci_hdrc * ci)183 u8 hw_port_test_get(struct ci_hdrc *ci)
184 {
185 return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> __ffs(PORTSC_PTC);
186 }
187
hw_wait_phy_stable(void)188 static 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 */
ci_hdrc_enter_lpm_common(struct ci_hdrc * ci,bool enable)200 static 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
ci_hdrc_enter_lpm(struct ci_hdrc * ci,bool enable)213 static void ci_hdrc_enter_lpm(struct ci_hdrc *ci, bool enable)
214 {
215 return ci->platdata->enter_lpm(ci, enable);
216 }
217
hw_device_init(struct ci_hdrc * ci,void __iomem * base)218 static 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
hw_phymode_configure(struct ci_hdrc * ci)269 void 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 }
309 EXPORT_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 */
_ci_usb_phy_init(struct ci_hdrc * ci)318 static 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 */
ci_usb_phy_exit(struct ci_hdrc * ci)344 static 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 */
ci_usb_phy_init(struct ci_hdrc * ci)363 static 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 */
ci_platform_configure(struct ci_hdrc * ci)403 void 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 */
hw_controller_reset(struct ci_hdrc * ci)460 static 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 */
hw_device_reset(struct ci_hdrc * ci)480 int 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
ci_irq_handler(int irq,void * data)519 static 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 /*
527 * If we already have a wakeup irq pending there,
528 * let's just return to wait resume finished firstly.
529 */
530 if (ci->wakeup_int)
531 return IRQ_HANDLED;
532
533 disable_irq_nosync(irq);
534 ci->wakeup_int = true;
535 pm_runtime_get(ci->dev);
536 return IRQ_HANDLED;
537 }
538
539 if (ci->is_otg) {
540 otgsc = hw_read_otgsc(ci, ~0);
541 if (ci_otg_is_fsm_mode(ci)) {
542 ret = ci_otg_fsm_irq(ci);
543 if (ret == IRQ_HANDLED)
544 return ret;
545 }
546 }
547
548 /*
549 * Handle id change interrupt, it indicates device/host function
550 * switch.
551 */
552 if (ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) {
553 ci->id_event = true;
554 /* Clear ID change irq status */
555 hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
556 ci_otg_queue_work(ci);
557 return IRQ_HANDLED;
558 }
559
560 /*
561 * Handle vbus change interrupt, it indicates device connection
562 * and disconnection events.
563 */
564 if (ci->is_otg && (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) {
565 ci->b_sess_valid_event = true;
566 /* Clear BSV irq */
567 hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
568 ci_otg_queue_work(ci);
569 return IRQ_HANDLED;
570 }
571
572 /* Handle device/host interrupt */
573 if (ci->role != CI_ROLE_END)
574 ret = ci_role(ci)->irq(ci);
575
576 return ret;
577 }
578
ci_irq(struct ci_hdrc * ci)579 static void ci_irq(struct ci_hdrc *ci)
580 {
581 unsigned long flags;
582
583 local_irq_save(flags);
584 ci_irq_handler(ci->irq, ci);
585 local_irq_restore(flags);
586 }
587
ci_cable_notifier(struct notifier_block * nb,unsigned long event,void * ptr)588 static int ci_cable_notifier(struct notifier_block *nb, unsigned long event,
589 void *ptr)
590 {
591 struct ci_hdrc_cable *cbl = container_of(nb, struct ci_hdrc_cable, nb);
592 struct ci_hdrc *ci = cbl->ci;
593
594 cbl->connected = event;
595 cbl->changed = true;
596
597 ci_irq(ci);
598 return NOTIFY_DONE;
599 }
600
ci_usb_role_switch_get(struct usb_role_switch * sw)601 static enum usb_role ci_usb_role_switch_get(struct usb_role_switch *sw)
602 {
603 struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
604 enum usb_role role;
605 unsigned long flags;
606
607 spin_lock_irqsave(&ci->lock, flags);
608 role = ci_role_to_usb_role(ci);
609 spin_unlock_irqrestore(&ci->lock, flags);
610
611 return role;
612 }
613
ci_usb_role_switch_set(struct usb_role_switch * sw,enum usb_role role)614 static int ci_usb_role_switch_set(struct usb_role_switch *sw,
615 enum usb_role role)
616 {
617 struct ci_hdrc *ci = usb_role_switch_get_drvdata(sw);
618 struct ci_hdrc_cable *cable;
619
620 if (role == USB_ROLE_HOST) {
621 cable = &ci->platdata->id_extcon;
622 cable->changed = true;
623 cable->connected = true;
624 cable = &ci->platdata->vbus_extcon;
625 cable->changed = true;
626 cable->connected = false;
627 } else if (role == USB_ROLE_DEVICE) {
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 = true;
634 } else {
635 cable = &ci->platdata->id_extcon;
636 cable->changed = true;
637 cable->connected = false;
638 cable = &ci->platdata->vbus_extcon;
639 cable->changed = true;
640 cable->connected = false;
641 }
642
643 ci_irq(ci);
644 return 0;
645 }
646
ci_get_role(struct ci_hdrc * ci)647 static enum ci_role ci_get_role(struct ci_hdrc *ci)
648 {
649 enum ci_role role;
650
651 if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
652 if (ci->is_otg) {
653 role = ci_otg_role(ci);
654 hw_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);
655 } else {
656 /*
657 * If the controller is not OTG capable, but support
658 * role switch, the defalt role is gadget, and the
659 * user can switch it through debugfs.
660 */
661 role = CI_ROLE_GADGET;
662 }
663 } else {
664 role = ci->roles[CI_ROLE_HOST] ? CI_ROLE_HOST
665 : CI_ROLE_GADGET;
666 }
667
668 return role;
669 }
670
671 static struct usb_role_switch_desc ci_role_switch = {
672 .set = ci_usb_role_switch_set,
673 .get = ci_usb_role_switch_get,
674 .allow_userspace_control = true,
675 };
676
ci_get_platdata(struct device * dev,struct ci_hdrc_platform_data * platdata)677 static int ci_get_platdata(struct device *dev,
678 struct ci_hdrc_platform_data *platdata)
679 {
680 struct extcon_dev *ext_vbus, *ext_id;
681 struct ci_hdrc_cable *cable;
682 int ret;
683
684 if (!platdata->phy_mode)
685 platdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
686
687 if (!platdata->dr_mode)
688 platdata->dr_mode = usb_get_dr_mode(dev);
689
690 if (platdata->dr_mode == USB_DR_MODE_UNKNOWN)
691 platdata->dr_mode = USB_DR_MODE_OTG;
692
693 if (platdata->dr_mode != USB_DR_MODE_PERIPHERAL) {
694 /* Get the vbus regulator */
695 platdata->reg_vbus = devm_regulator_get_optional(dev, "vbus");
696 if (PTR_ERR(platdata->reg_vbus) == -EPROBE_DEFER) {
697 return -EPROBE_DEFER;
698 } else if (PTR_ERR(platdata->reg_vbus) == -ENODEV) {
699 /* no vbus regulator is needed */
700 platdata->reg_vbus = NULL;
701 } else if (IS_ERR(platdata->reg_vbus)) {
702 dev_err(dev, "Getting regulator error: %ld\n",
703 PTR_ERR(platdata->reg_vbus));
704 return PTR_ERR(platdata->reg_vbus);
705 }
706 /* Get TPL support */
707 if (!platdata->tpl_support)
708 platdata->tpl_support =
709 of_usb_host_tpl_support(dev->of_node);
710 }
711
712 if (platdata->dr_mode == USB_DR_MODE_OTG) {
713 /* We can support HNP and SRP of OTG 2.0 */
714 platdata->ci_otg_caps.otg_rev = 0x0200;
715 platdata->ci_otg_caps.hnp_support = true;
716 platdata->ci_otg_caps.srp_support = true;
717
718 /* Update otg capabilities by DT properties */
719 ret = of_usb_update_otg_caps(dev->of_node,
720 &platdata->ci_otg_caps);
721 if (ret)
722 return ret;
723 }
724
725 if (usb_get_maximum_speed(dev) == USB_SPEED_FULL)
726 platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
727
728 of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
729 &platdata->phy_clkgate_delay_us);
730
731 platdata->itc_setting = 1;
732
733 of_property_read_u32(dev->of_node, "itc-setting",
734 &platdata->itc_setting);
735
736 ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
737 &platdata->ahb_burst_config);
738 if (!ret) {
739 platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
740 } else if (ret != -EINVAL) {
741 dev_err(dev, "failed to get ahb-burst-config\n");
742 return ret;
743 }
744
745 ret = of_property_read_u32(dev->of_node, "tx-burst-size-dword",
746 &platdata->tx_burst_size);
747 if (!ret) {
748 platdata->flags |= CI_HDRC_OVERRIDE_TX_BURST;
749 } else if (ret != -EINVAL) {
750 dev_err(dev, "failed to get tx-burst-size-dword\n");
751 return ret;
752 }
753
754 ret = of_property_read_u32(dev->of_node, "rx-burst-size-dword",
755 &platdata->rx_burst_size);
756 if (!ret) {
757 platdata->flags |= CI_HDRC_OVERRIDE_RX_BURST;
758 } else if (ret != -EINVAL) {
759 dev_err(dev, "failed to get rx-burst-size-dword\n");
760 return ret;
761 }
762
763 if (of_property_read_bool(dev->of_node, "non-zero-ttctrl-ttha"))
764 platdata->flags |= CI_HDRC_SET_NON_ZERO_TTHA;
765
766 ext_id = ERR_PTR(-ENODEV);
767 ext_vbus = ERR_PTR(-ENODEV);
768 if (of_property_read_bool(dev->of_node, "extcon")) {
769 /* Each one of them is not mandatory */
770 ext_vbus = extcon_get_edev_by_phandle(dev, 0);
771 if (IS_ERR(ext_vbus) && PTR_ERR(ext_vbus) != -ENODEV)
772 return PTR_ERR(ext_vbus);
773
774 ext_id = extcon_get_edev_by_phandle(dev, 1);
775 if (IS_ERR(ext_id) && PTR_ERR(ext_id) != -ENODEV)
776 return PTR_ERR(ext_id);
777 }
778
779 cable = &platdata->vbus_extcon;
780 cable->nb.notifier_call = ci_cable_notifier;
781 cable->edev = ext_vbus;
782
783 if (!IS_ERR(ext_vbus)) {
784 ret = extcon_get_state(cable->edev, EXTCON_USB);
785 if (ret)
786 cable->connected = true;
787 else
788 cable->connected = false;
789 }
790
791 cable = &platdata->id_extcon;
792 cable->nb.notifier_call = ci_cable_notifier;
793 cable->edev = ext_id;
794
795 if (!IS_ERR(ext_id)) {
796 ret = extcon_get_state(cable->edev, EXTCON_USB_HOST);
797 if (ret)
798 cable->connected = true;
799 else
800 cable->connected = false;
801 }
802
803 if (device_property_read_bool(dev, "usb-role-switch"))
804 ci_role_switch.fwnode = dev->fwnode;
805
806 platdata->pctl = devm_pinctrl_get(dev);
807 if (!IS_ERR(platdata->pctl)) {
808 struct pinctrl_state *p;
809
810 p = pinctrl_lookup_state(platdata->pctl, "default");
811 if (!IS_ERR(p))
812 platdata->pins_default = p;
813
814 p = pinctrl_lookup_state(platdata->pctl, "host");
815 if (!IS_ERR(p))
816 platdata->pins_host = p;
817
818 p = pinctrl_lookup_state(platdata->pctl, "device");
819 if (!IS_ERR(p))
820 platdata->pins_device = p;
821 }
822
823 if (!platdata->enter_lpm)
824 platdata->enter_lpm = ci_hdrc_enter_lpm_common;
825
826 return 0;
827 }
828
ci_extcon_register(struct ci_hdrc * ci)829 static int ci_extcon_register(struct ci_hdrc *ci)
830 {
831 struct ci_hdrc_cable *id, *vbus;
832 int ret;
833
834 id = &ci->platdata->id_extcon;
835 id->ci = ci;
836 if (!IS_ERR_OR_NULL(id->edev)) {
837 ret = devm_extcon_register_notifier(ci->dev, id->edev,
838 EXTCON_USB_HOST, &id->nb);
839 if (ret < 0) {
840 dev_err(ci->dev, "register ID failed\n");
841 return ret;
842 }
843 }
844
845 vbus = &ci->platdata->vbus_extcon;
846 vbus->ci = ci;
847 if (!IS_ERR_OR_NULL(vbus->edev)) {
848 ret = devm_extcon_register_notifier(ci->dev, vbus->edev,
849 EXTCON_USB, &vbus->nb);
850 if (ret < 0) {
851 dev_err(ci->dev, "register VBUS failed\n");
852 return ret;
853 }
854 }
855
856 return 0;
857 }
858
ci_power_lost_work(struct work_struct * work)859 static void ci_power_lost_work(struct work_struct *work)
860 {
861 struct ci_hdrc *ci = container_of(work, struct ci_hdrc, power_lost_work);
862 enum ci_role role;
863
864 disable_irq_nosync(ci->irq);
865 pm_runtime_get_sync(ci->dev);
866 if (!ci_otg_is_fsm_mode(ci)) {
867 role = ci_get_role(ci);
868
869 if (ci->role != role) {
870 ci_handle_id_switch(ci);
871 } else if (role == CI_ROLE_GADGET) {
872 if (ci->is_otg && hw_read_otgsc(ci, OTGSC_BSV))
873 usb_gadget_vbus_connect(&ci->gadget);
874 }
875 }
876 pm_runtime_put_sync(ci->dev);
877 enable_irq(ci->irq);
878 }
879
880 static DEFINE_IDA(ci_ida);
881
ci_hdrc_add_device(struct device * dev,struct resource * res,int nres,struct ci_hdrc_platform_data * platdata)882 struct platform_device *ci_hdrc_add_device(struct device *dev,
883 struct resource *res, int nres,
884 struct ci_hdrc_platform_data *platdata)
885 {
886 struct platform_device *pdev;
887 int id, ret;
888
889 ret = ci_get_platdata(dev, platdata);
890 if (ret)
891 return ERR_PTR(ret);
892
893 id = ida_alloc(&ci_ida, GFP_KERNEL);
894 if (id < 0)
895 return ERR_PTR(id);
896
897 pdev = platform_device_alloc("ci_hdrc", id);
898 if (!pdev) {
899 ret = -ENOMEM;
900 goto put_id;
901 }
902
903 pdev->dev.parent = dev;
904 device_set_of_node_from_dev(&pdev->dev, dev);
905
906 ret = platform_device_add_resources(pdev, res, nres);
907 if (ret)
908 goto err;
909
910 ret = platform_device_add_data(pdev, platdata, sizeof(*platdata));
911 if (ret)
912 goto err;
913
914 ret = platform_device_add(pdev);
915 if (ret)
916 goto err;
917
918 return pdev;
919
920 err:
921 platform_device_put(pdev);
922 put_id:
923 ida_free(&ci_ida, id);
924 return ERR_PTR(ret);
925 }
926 EXPORT_SYMBOL_GPL(ci_hdrc_add_device);
927
ci_hdrc_remove_device(struct platform_device * pdev)928 void ci_hdrc_remove_device(struct platform_device *pdev)
929 {
930 int id = pdev->id;
931 platform_device_unregister(pdev);
932 ida_free(&ci_ida, id);
933 }
934 EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
935
936 /**
937 * ci_hdrc_query_available_role: get runtime available operation mode
938 *
939 * The glue layer can get current operation mode (host/peripheral/otg)
940 * This function should be called after ci core device has created.
941 *
942 * @pdev: the platform device of ci core.
943 *
944 * Return runtime usb_dr_mode.
945 */
ci_hdrc_query_available_role(struct platform_device * pdev)946 enum usb_dr_mode ci_hdrc_query_available_role(struct platform_device *pdev)
947 {
948 struct ci_hdrc *ci = platform_get_drvdata(pdev);
949
950 if (!ci)
951 return USB_DR_MODE_UNKNOWN;
952 if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])
953 return USB_DR_MODE_OTG;
954 else if (ci->roles[CI_ROLE_HOST])
955 return USB_DR_MODE_HOST;
956 else if (ci->roles[CI_ROLE_GADGET])
957 return USB_DR_MODE_PERIPHERAL;
958 else
959 return USB_DR_MODE_UNKNOWN;
960 }
961 EXPORT_SYMBOL_GPL(ci_hdrc_query_available_role);
962
ci_role_destroy(struct ci_hdrc * ci)963 static inline void ci_role_destroy(struct ci_hdrc *ci)
964 {
965 ci_hdrc_gadget_destroy(ci);
966 ci_hdrc_host_destroy(ci);
967 if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
968 ci_hdrc_otg_destroy(ci);
969 }
970
ci_get_otg_capable(struct ci_hdrc * ci)971 static void ci_get_otg_capable(struct ci_hdrc *ci)
972 {
973 if (ci->platdata->flags & CI_HDRC_DUAL_ROLE_NOT_OTG)
974 ci->is_otg = false;
975 else
976 ci->is_otg = (hw_read(ci, CAP_DCCPARAMS,
977 DCCPARAMS_DC | DCCPARAMS_HC)
978 == (DCCPARAMS_DC | DCCPARAMS_HC));
979 if (ci->is_otg) {
980 dev_dbg(ci->dev, "It is OTG capable controller\n");
981 /* Disable and clear all OTG irq */
982 hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
983 OTGSC_INT_STATUS_BITS);
984 }
985 }
986
role_show(struct device * dev,struct device_attribute * attr,char * buf)987 static ssize_t role_show(struct device *dev, struct device_attribute *attr,
988 char *buf)
989 {
990 struct ci_hdrc *ci = dev_get_drvdata(dev);
991
992 if (ci->role != CI_ROLE_END)
993 return sprintf(buf, "%s\n", ci_role(ci)->name);
994
995 return 0;
996 }
997
role_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t n)998 static ssize_t role_store(struct device *dev,
999 struct device_attribute *attr, const char *buf, size_t n)
1000 {
1001 struct ci_hdrc *ci = dev_get_drvdata(dev);
1002 enum ci_role role;
1003 int ret;
1004
1005 if (!(ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])) {
1006 dev_warn(dev, "Current configuration is not dual-role, quit\n");
1007 return -EPERM;
1008 }
1009
1010 for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
1011 if (!strncmp(buf, ci->roles[role]->name,
1012 strlen(ci->roles[role]->name)))
1013 break;
1014
1015 if (role == CI_ROLE_END)
1016 return -EINVAL;
1017
1018 mutex_lock(&ci->mutex);
1019
1020 if (role == ci->role) {
1021 mutex_unlock(&ci->mutex);
1022 return n;
1023 }
1024
1025 pm_runtime_get_sync(dev);
1026 disable_irq(ci->irq);
1027 ci_role_stop(ci);
1028 ret = ci_role_start(ci, role);
1029 if (!ret && ci->role == CI_ROLE_GADGET)
1030 ci_handle_vbus_change(ci);
1031 enable_irq(ci->irq);
1032 pm_runtime_put_sync(dev);
1033 mutex_unlock(&ci->mutex);
1034
1035 return (ret == 0) ? n : ret;
1036 }
1037 static DEVICE_ATTR_RW(role);
1038
1039 static struct attribute *ci_attrs[] = {
1040 &dev_attr_role.attr,
1041 NULL,
1042 };
1043 ATTRIBUTE_GROUPS(ci);
1044
ci_hdrc_probe(struct platform_device * pdev)1045 static int ci_hdrc_probe(struct platform_device *pdev)
1046 {
1047 struct device *dev = &pdev->dev;
1048 struct ci_hdrc *ci;
1049 struct resource *res;
1050 void __iomem *base;
1051 int ret;
1052 enum usb_dr_mode dr_mode;
1053
1054 if (!dev_get_platdata(dev)) {
1055 dev_err(dev, "platform data missing\n");
1056 return -ENODEV;
1057 }
1058
1059 base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
1060 if (IS_ERR(base))
1061 return PTR_ERR(base);
1062
1063 ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
1064 if (!ci)
1065 return -ENOMEM;
1066
1067 spin_lock_init(&ci->lock);
1068 mutex_init(&ci->mutex);
1069 INIT_WORK(&ci->power_lost_work, ci_power_lost_work);
1070
1071 ci->dev = dev;
1072 ci->platdata = dev_get_platdata(dev);
1073 ci->imx28_write_fix = !!(ci->platdata->flags &
1074 CI_HDRC_IMX28_WRITE_FIX);
1075 ci->supports_runtime_pm = !!(ci->platdata->flags &
1076 CI_HDRC_SUPPORTS_RUNTIME_PM);
1077 ci->has_portsc_pec_bug = !!(ci->platdata->flags &
1078 CI_HDRC_HAS_PORTSC_PEC_MISSED);
1079 platform_set_drvdata(pdev, ci);
1080
1081 ret = hw_device_init(ci, base);
1082 if (ret < 0) {
1083 dev_err(dev, "can't initialize hardware\n");
1084 return -ENODEV;
1085 }
1086
1087 ret = ci_ulpi_init(ci);
1088 if (ret)
1089 return ret;
1090
1091 if (ci->platdata->phy) {
1092 ci->phy = ci->platdata->phy;
1093 } else if (ci->platdata->usb_phy) {
1094 ci->usb_phy = ci->platdata->usb_phy;
1095 } else {
1096 /* Look for a generic PHY first */
1097 ci->phy = devm_phy_get(dev->parent, "usb-phy");
1098
1099 if (PTR_ERR(ci->phy) == -EPROBE_DEFER) {
1100 ret = -EPROBE_DEFER;
1101 goto ulpi_exit;
1102 } else if (IS_ERR(ci->phy)) {
1103 ci->phy = NULL;
1104 }
1105
1106 /* Look for a legacy USB PHY from device-tree next */
1107 if (!ci->phy) {
1108 ci->usb_phy = devm_usb_get_phy_by_phandle(dev->parent,
1109 "phys", 0);
1110
1111 if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1112 ret = -EPROBE_DEFER;
1113 goto ulpi_exit;
1114 } else if (IS_ERR(ci->usb_phy)) {
1115 ci->usb_phy = NULL;
1116 }
1117 }
1118
1119 /* Look for any registered legacy USB PHY as last resort */
1120 if (!ci->phy && !ci->usb_phy) {
1121 ci->usb_phy = devm_usb_get_phy(dev->parent,
1122 USB_PHY_TYPE_USB2);
1123
1124 if (PTR_ERR(ci->usb_phy) == -EPROBE_DEFER) {
1125 ret = -EPROBE_DEFER;
1126 goto ulpi_exit;
1127 } else if (IS_ERR(ci->usb_phy)) {
1128 ci->usb_phy = NULL;
1129 }
1130 }
1131
1132 /* No USB PHY was found in the end */
1133 if (!ci->phy && !ci->usb_phy) {
1134 ret = -ENXIO;
1135 goto ulpi_exit;
1136 }
1137 }
1138
1139 ret = ci_usb_phy_init(ci);
1140 if (ret) {
1141 dev_err(dev, "unable to init phy: %d\n", ret);
1142 goto ulpi_exit;
1143 }
1144
1145 ci->hw_bank.phys = res->start;
1146
1147 ci->irq = platform_get_irq(pdev, 0);
1148 if (ci->irq < 0) {
1149 ret = ci->irq;
1150 goto deinit_phy;
1151 }
1152
1153 ci_get_otg_capable(ci);
1154
1155 dr_mode = ci->platdata->dr_mode;
1156 /* initialize role(s) before the interrupt is requested */
1157 if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
1158 ret = ci_hdrc_host_init(ci);
1159 if (ret) {
1160 if (ret == -ENXIO)
1161 dev_info(dev, "doesn't support host\n");
1162 else
1163 goto deinit_phy;
1164 }
1165 }
1166
1167 if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
1168 ret = ci_hdrc_gadget_init(ci);
1169 if (ret) {
1170 if (ret == -ENXIO)
1171 dev_info(dev, "doesn't support gadget\n");
1172 else
1173 goto deinit_host;
1174 }
1175 }
1176
1177 if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
1178 dev_err(dev, "no supported roles\n");
1179 ret = -ENODEV;
1180 goto deinit_gadget;
1181 }
1182
1183 if (ci->is_otg && ci->roles[CI_ROLE_GADGET]) {
1184 ret = ci_hdrc_otg_init(ci);
1185 if (ret) {
1186 dev_err(dev, "init otg fails, ret = %d\n", ret);
1187 goto deinit_gadget;
1188 }
1189 }
1190
1191 if (ci_role_switch.fwnode) {
1192 ci_role_switch.driver_data = ci;
1193 ci->role_switch = usb_role_switch_register(dev,
1194 &ci_role_switch);
1195 if (IS_ERR(ci->role_switch)) {
1196 ret = PTR_ERR(ci->role_switch);
1197 goto deinit_otg;
1198 }
1199 }
1200
1201 ci->role = ci_get_role(ci);
1202 if (!ci_otg_is_fsm_mode(ci)) {
1203 /* only update vbus status for peripheral */
1204 if (ci->role == CI_ROLE_GADGET) {
1205 /* Pull down DP for possible charger detection */
1206 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
1207 ci_handle_vbus_change(ci);
1208 }
1209
1210 ret = ci_role_start(ci, ci->role);
1211 if (ret) {
1212 dev_err(dev, "can't start %s role\n",
1213 ci_role(ci)->name);
1214 goto stop;
1215 }
1216 }
1217
1218 ret = devm_request_irq(dev, ci->irq, ci_irq_handler, IRQF_SHARED,
1219 ci->platdata->name, ci);
1220 if (ret)
1221 goto stop;
1222
1223 ret = ci_extcon_register(ci);
1224 if (ret)
1225 goto stop;
1226
1227 if (ci->supports_runtime_pm) {
1228 pm_runtime_set_active(&pdev->dev);
1229 pm_runtime_enable(&pdev->dev);
1230 pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
1231 pm_runtime_mark_last_busy(ci->dev);
1232 pm_runtime_use_autosuspend(&pdev->dev);
1233 }
1234
1235 if (ci_otg_is_fsm_mode(ci))
1236 ci_hdrc_otg_fsm_start(ci);
1237
1238 device_set_wakeup_capable(&pdev->dev, true);
1239 dbg_create_files(ci);
1240
1241 return 0;
1242
1243 stop:
1244 if (ci->role_switch)
1245 usb_role_switch_unregister(ci->role_switch);
1246 deinit_otg:
1247 if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
1248 ci_hdrc_otg_destroy(ci);
1249 deinit_gadget:
1250 ci_hdrc_gadget_destroy(ci);
1251 deinit_host:
1252 ci_hdrc_host_destroy(ci);
1253 deinit_phy:
1254 ci_usb_phy_exit(ci);
1255 ulpi_exit:
1256 ci_ulpi_exit(ci);
1257
1258 return ret;
1259 }
1260
ci_hdrc_remove(struct platform_device * pdev)1261 static void ci_hdrc_remove(struct platform_device *pdev)
1262 {
1263 struct ci_hdrc *ci = platform_get_drvdata(pdev);
1264
1265 if (ci->role_switch)
1266 usb_role_switch_unregister(ci->role_switch);
1267
1268 if (ci->supports_runtime_pm) {
1269 pm_runtime_get_sync(&pdev->dev);
1270 pm_runtime_disable(&pdev->dev);
1271 pm_runtime_put_noidle(&pdev->dev);
1272 }
1273
1274 dbg_remove_files(ci);
1275 ci_role_destroy(ci);
1276 ci_hdrc_enter_lpm(ci, true);
1277 ci_usb_phy_exit(ci);
1278 ci_ulpi_exit(ci);
1279 }
1280
1281 #ifdef CONFIG_PM
1282 /* Prepare wakeup by SRP before suspend */
ci_otg_fsm_suspend_for_srp(struct ci_hdrc * ci)1283 static void ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
1284 {
1285 if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1286 !hw_read_otgsc(ci, OTGSC_ID)) {
1287 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
1288 PORTSC_PP);
1289 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_WKCN,
1290 PORTSC_WKCN);
1291 }
1292 }
1293
1294 /* Handle SRP when wakeup by data pulse */
ci_otg_fsm_wakeup_by_srp(struct ci_hdrc * ci)1295 static void ci_otg_fsm_wakeup_by_srp(struct ci_hdrc *ci)
1296 {
1297 if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1298 (ci->fsm.a_bus_drop == 1) && (ci->fsm.a_bus_req == 0)) {
1299 if (!hw_read_otgsc(ci, OTGSC_ID)) {
1300 ci->fsm.a_srp_det = 1;
1301 ci->fsm.a_bus_drop = 0;
1302 } else {
1303 ci->fsm.id = 1;
1304 }
1305 ci_otg_queue_work(ci);
1306 }
1307 }
1308
ci_controller_suspend(struct ci_hdrc * ci)1309 static void ci_controller_suspend(struct ci_hdrc *ci)
1310 {
1311 disable_irq(ci->irq);
1312 ci_hdrc_enter_lpm(ci, true);
1313 if (ci->platdata->phy_clkgate_delay_us)
1314 usleep_range(ci->platdata->phy_clkgate_delay_us,
1315 ci->platdata->phy_clkgate_delay_us + 50);
1316 usb_phy_set_suspend(ci->usb_phy, 1);
1317 ci->in_lpm = true;
1318 enable_irq(ci->irq);
1319 }
1320
1321 /*
1322 * Handle the wakeup interrupt triggered by extcon connector
1323 * We need to call ci_irq again for extcon since the first
1324 * interrupt (wakeup int) only let the controller be out of
1325 * low power mode, but not handle any interrupts.
1326 */
ci_extcon_wakeup_int(struct ci_hdrc * ci)1327 static void ci_extcon_wakeup_int(struct ci_hdrc *ci)
1328 {
1329 struct ci_hdrc_cable *cable_id, *cable_vbus;
1330 u32 otgsc = hw_read_otgsc(ci, ~0);
1331
1332 cable_id = &ci->platdata->id_extcon;
1333 cable_vbus = &ci->platdata->vbus_extcon;
1334
1335 if ((!IS_ERR(cable_id->edev) || ci->role_switch)
1336 && ci->is_otg &&
1337 (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS))
1338 ci_irq(ci);
1339
1340 if ((!IS_ERR(cable_vbus->edev) || ci->role_switch)
1341 && ci->is_otg &&
1342 (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS))
1343 ci_irq(ci);
1344 }
1345
ci_controller_resume(struct device * dev)1346 static int ci_controller_resume(struct device *dev)
1347 {
1348 struct ci_hdrc *ci = dev_get_drvdata(dev);
1349 int ret;
1350
1351 dev_dbg(dev, "at %s\n", __func__);
1352
1353 if (!ci->in_lpm) {
1354 WARN_ON(1);
1355 return 0;
1356 }
1357
1358 ci_hdrc_enter_lpm(ci, false);
1359
1360 ret = ci_ulpi_resume(ci);
1361 if (ret)
1362 return ret;
1363
1364 if (ci->usb_phy) {
1365 usb_phy_set_suspend(ci->usb_phy, 0);
1366 usb_phy_set_wakeup(ci->usb_phy, false);
1367 hw_wait_phy_stable();
1368 }
1369
1370 ci->in_lpm = false;
1371 if (ci->wakeup_int) {
1372 ci->wakeup_int = false;
1373 pm_runtime_mark_last_busy(ci->dev);
1374 pm_runtime_put_autosuspend(ci->dev);
1375 enable_irq(ci->irq);
1376 if (ci_otg_is_fsm_mode(ci))
1377 ci_otg_fsm_wakeup_by_srp(ci);
1378 ci_extcon_wakeup_int(ci);
1379 }
1380
1381 return 0;
1382 }
1383
1384 #ifdef CONFIG_PM_SLEEP
ci_suspend(struct device * dev)1385 static int ci_suspend(struct device *dev)
1386 {
1387 struct ci_hdrc *ci = dev_get_drvdata(dev);
1388
1389 if (ci->wq)
1390 flush_workqueue(ci->wq);
1391 /*
1392 * Controller needs to be active during suspend, otherwise the core
1393 * may run resume when the parent is at suspend if other driver's
1394 * suspend fails, it occurs before parent's suspend has not started,
1395 * but the core suspend has finished.
1396 */
1397 if (ci->in_lpm)
1398 pm_runtime_resume(dev);
1399
1400 if (ci->in_lpm) {
1401 WARN_ON(1);
1402 return 0;
1403 }
1404
1405 /* Extra routine per role before system suspend */
1406 if (ci->role != CI_ROLE_END && ci_role(ci)->suspend)
1407 ci_role(ci)->suspend(ci);
1408
1409 if (device_may_wakeup(dev)) {
1410 if (ci_otg_is_fsm_mode(ci))
1411 ci_otg_fsm_suspend_for_srp(ci);
1412
1413 usb_phy_set_wakeup(ci->usb_phy, true);
1414 enable_irq_wake(ci->irq);
1415 }
1416
1417 ci_controller_suspend(ci);
1418
1419 return 0;
1420 }
1421
ci_resume(struct device * dev)1422 static int ci_resume(struct device *dev)
1423 {
1424 struct ci_hdrc *ci = dev_get_drvdata(dev);
1425 bool power_lost;
1426 int ret;
1427
1428 /* Since ASYNCLISTADDR (host mode) and ENDPTLISTADDR (device
1429 * mode) share the same register address. We can check if
1430 * controller resume from power lost based on this address
1431 * due to this register will be reset after power lost.
1432 */
1433 power_lost = !hw_read(ci, OP_ENDPTLISTADDR, ~0);
1434
1435 if (device_may_wakeup(dev))
1436 disable_irq_wake(ci->irq);
1437
1438 ret = ci_controller_resume(dev);
1439 if (ret)
1440 return ret;
1441
1442 if (power_lost) {
1443 /* shutdown and re-init for phy */
1444 ci_usb_phy_exit(ci);
1445 ci_usb_phy_init(ci);
1446 }
1447
1448 /* Extra routine per role after system resume */
1449 if (ci->role != CI_ROLE_END && ci_role(ci)->resume)
1450 ci_role(ci)->resume(ci, power_lost);
1451
1452 if (power_lost)
1453 queue_work(system_freezable_wq, &ci->power_lost_work);
1454
1455 if (ci->supports_runtime_pm) {
1456 pm_runtime_disable(dev);
1457 pm_runtime_set_active(dev);
1458 pm_runtime_enable(dev);
1459 }
1460
1461 return ret;
1462 }
1463 #endif /* CONFIG_PM_SLEEP */
1464
ci_runtime_suspend(struct device * dev)1465 static int ci_runtime_suspend(struct device *dev)
1466 {
1467 struct ci_hdrc *ci = dev_get_drvdata(dev);
1468
1469 dev_dbg(dev, "at %s\n", __func__);
1470
1471 if (ci->in_lpm) {
1472 WARN_ON(1);
1473 return 0;
1474 }
1475
1476 if (ci_otg_is_fsm_mode(ci))
1477 ci_otg_fsm_suspend_for_srp(ci);
1478
1479 usb_phy_set_wakeup(ci->usb_phy, true);
1480 ci_controller_suspend(ci);
1481
1482 return 0;
1483 }
1484
ci_runtime_resume(struct device * dev)1485 static int ci_runtime_resume(struct device *dev)
1486 {
1487 return ci_controller_resume(dev);
1488 }
1489
1490 #endif /* CONFIG_PM */
1491 static const struct dev_pm_ops ci_pm_ops = {
1492 SET_SYSTEM_SLEEP_PM_OPS(ci_suspend, ci_resume)
1493 SET_RUNTIME_PM_OPS(ci_runtime_suspend, ci_runtime_resume, NULL)
1494 };
1495
1496 static struct platform_driver ci_hdrc_driver = {
1497 .probe = ci_hdrc_probe,
1498 .remove_new = ci_hdrc_remove,
1499 .driver = {
1500 .name = "ci_hdrc",
1501 .pm = &ci_pm_ops,
1502 .dev_groups = ci_groups,
1503 },
1504 };
1505
ci_hdrc_platform_register(void)1506 static int __init ci_hdrc_platform_register(void)
1507 {
1508 ci_hdrc_host_driver_init();
1509 return platform_driver_register(&ci_hdrc_driver);
1510 }
1511 module_init(ci_hdrc_platform_register);
1512
ci_hdrc_platform_unregister(void)1513 static void __exit ci_hdrc_platform_unregister(void)
1514 {
1515 platform_driver_unregister(&ci_hdrc_driver);
1516 }
1517 module_exit(ci_hdrc_platform_unregister);
1518
1519 MODULE_ALIAS("platform:ci_hdrc");
1520 MODULE_LICENSE("GPL v2");
1521 MODULE_AUTHOR("David Lopo <dlopo@chipidea.mips.com>");
1522 MODULE_DESCRIPTION("ChipIdea HDRC Driver");
1523