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usb: allow to supply the PHY in the drivers when using HCD
[linux-2.6-block.git] / drivers / usb / chipidea / otg_fsm.c
CommitLineData
57677be5
LJ		 1/*
2 * otg_fsm.c - ChipIdea USB IP core OTG FSM driver
3 *
4 * Copyright (C) 2014 Freescale Semiconductor, Inc.
5 *
6 * Author: Jun Li
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13/*
14 * This file mainly handles OTG fsm, it includes OTG fsm operations
15 * for HNP and SRP.
4dcf720c
LJ		 16 *
17 * TODO List
18 * - ADP
19 * - OTG test device
57677be5
LJ		 20 */
21
22#include <linux/usb/otg.h>
23#include <linux/usb/gadget.h>
24#include <linux/usb/hcd.h>
25#include <linux/usb/chipidea.h>
826cfe75 26#include <linux/regulator/consumer.h>
57677be5
LJ		 27
28#include "ci.h"
29#include "bits.h"
30#include "otg.h"
31#include "otg_fsm.h"
32
e287b67b
LJ		 33static struct ci_otg_fsm_timer *otg_timer_initializer
34(struct ci_hdrc *ci, void (*function)(void *, unsigned long),
35 unsigned long expires, unsigned long data)
36{
37 struct ci_otg_fsm_timer *timer;
38
39 timer = devm_kzalloc(ci->dev, sizeof(struct ci_otg_fsm_timer),
40 GFP_KERNEL);
41 if (!timer)
42 return NULL;
43 timer->function = function;
44 timer->expires = expires;
45 timer->data = data;
46 return timer;
47}
48
15f75def
LJ		 49/* Add for otg: interact with user space app */
50static ssize_t
51get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
52{
53 char *next;
54 unsigned size, t;
55 struct ci_hdrc *ci = dev_get_drvdata(dev);
56
57 next = buf;
58 size = PAGE_SIZE;
59 t = scnprintf(next, size, "%d\n", ci->fsm.a_bus_req);
60 size -= t;
61 next += t;
62
63 return PAGE_SIZE - size;
64}
65
66static ssize_t
67set_a_bus_req(struct device *dev, struct device_attribute *attr,
68 const char *buf, size_t count)
69{
70 struct ci_hdrc *ci = dev_get_drvdata(dev);
71
72 if (count > 2)
73 return -1;
74
75 mutex_lock(&ci->fsm.lock);
76 if (buf[0] == '0') {
77 ci->fsm.a_bus_req = 0;
78 } else if (buf[0] == '1') {
79 /* If a_bus_drop is TRUE, a_bus_req can't be set */
80 if (ci->fsm.a_bus_drop) {
81 mutex_unlock(&ci->fsm.lock);
82 return count;
83 }
84 ci->fsm.a_bus_req = 1;
85 }
86
be6b0c1b 87 ci_otg_queue_work(ci);
15f75def
LJ		 88 mutex_unlock(&ci->fsm.lock);
89
90 return count;
91}
92static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req, set_a_bus_req);
93
94static ssize_t
95get_a_bus_drop(struct device *dev, struct device_attribute *attr, char *buf)
96{
97 char *next;
98 unsigned size, t;
99 struct ci_hdrc *ci = dev_get_drvdata(dev);
100
101 next = buf;
102 size = PAGE_SIZE;
103 t = scnprintf(next, size, "%d\n", ci->fsm.a_bus_drop);
104 size -= t;
105 next += t;
106
107 return PAGE_SIZE - size;
108}
109
110static ssize_t
111set_a_bus_drop(struct device *dev, struct device_attribute *attr,
112 const char *buf, size_t count)
113{
114 struct ci_hdrc *ci = dev_get_drvdata(dev);
115
116 if (count > 2)
117 return -1;
118
119 mutex_lock(&ci->fsm.lock);
120 if (buf[0] == '0') {
121 ci->fsm.a_bus_drop = 0;
122 } else if (buf[0] == '1') {
123 ci->fsm.a_bus_drop = 1;
124 ci->fsm.a_bus_req = 0;
125 }
126
be6b0c1b 127 ci_otg_queue_work(ci);
15f75def
LJ		 128 mutex_unlock(&ci->fsm.lock);
129
130 return count;
131}
132static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR, get_a_bus_drop,
133 set_a_bus_drop);
134
135static ssize_t
136get_b_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
137{
138 char *next;
139 unsigned size, t;
140 struct ci_hdrc *ci = dev_get_drvdata(dev);
141
142 next = buf;
143 size = PAGE_SIZE;
144 t = scnprintf(next, size, "%d\n", ci->fsm.b_bus_req);
145 size -= t;
146 next += t;
147
148 return PAGE_SIZE - size;
149}
150
151static ssize_t
152set_b_bus_req(struct device *dev, struct device_attribute *attr,
153 const char *buf, size_t count)
154{
155 struct ci_hdrc *ci = dev_get_drvdata(dev);
156
157 if (count > 2)
158 return -1;
159
160 mutex_lock(&ci->fsm.lock);
161 if (buf[0] == '0')
162 ci->fsm.b_bus_req = 0;
163 else if (buf[0] == '1')
164 ci->fsm.b_bus_req = 1;
165
be6b0c1b 166 ci_otg_queue_work(ci);
15f75def
LJ		 167 mutex_unlock(&ci->fsm.lock);
168
169 return count;
170}
171static DEVICE_ATTR(b_bus_req, S_IRUGO | S_IWUSR, get_b_bus_req, set_b_bus_req);
172
173static ssize_t
174set_a_clr_err(struct device *dev, struct device_attribute *attr,
175 const char *buf, size_t count)
176{
177 struct ci_hdrc *ci = dev_get_drvdata(dev);
178
179 if (count > 2)
180 return -1;
181
182 mutex_lock(&ci->fsm.lock);
183 if (buf[0] == '1')
184 ci->fsm.a_clr_err = 1;
185
be6b0c1b 186 ci_otg_queue_work(ci);
15f75def
LJ		 187 mutex_unlock(&ci->fsm.lock);
188
189 return count;
190}
191static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
192
193static struct attribute *inputs_attrs[] = {
194 &dev_attr_a_bus_req.attr,
195 &dev_attr_a_bus_drop.attr,
196 &dev_attr_b_bus_req.attr,
197 &dev_attr_a_clr_err.attr,
198 NULL,
199};
200
201static struct attribute_group inputs_attr_group = {
202 .name = "inputs",
203 .attrs = inputs_attrs,
204};
205
826cfe75
LJ		 206/*
207 * Add timer to active timer list
208 */
209static void ci_otg_add_timer(struct ci_hdrc *ci, enum ci_otg_fsm_timer_index t)
210{
211 struct ci_otg_fsm_timer *tmp_timer;
212 struct ci_otg_fsm_timer *timer = ci->fsm_timer->timer_list[t];
213 struct list_head *active_timers = &ci->fsm_timer->active_timers;
214
215 if (t >= NUM_CI_OTG_FSM_TIMERS)
216 return;
217
218 /*
219 * Check if the timer is already in the active list,
220 * if so update timer count
221 */
222 list_for_each_entry(tmp_timer, active_timers, list)
223 if (tmp_timer == timer) {
224 timer->count = timer->expires;
225 return;
226 }
227
228 timer->count = timer->expires;
229 list_add_tail(&timer->list, active_timers);
230
231 /* Enable 1ms irq */
232 if (!(hw_read_otgsc(ci, OTGSC_1MSIE)))
233 hw_write_otgsc(ci, OTGSC_1MSIE, OTGSC_1MSIE);
234}
235
236/*
237 * Remove timer from active timer list
238 */
239static void ci_otg_del_timer(struct ci_hdrc *ci, enum ci_otg_fsm_timer_index t)
240{
241 struct ci_otg_fsm_timer *tmp_timer, *del_tmp;
242 struct ci_otg_fsm_timer *timer = ci->fsm_timer->timer_list[t];
243 struct list_head *active_timers = &ci->fsm_timer->active_timers;
244
245 if (t >= NUM_CI_OTG_FSM_TIMERS)
246 return;
247
248 list_for_each_entry_safe(tmp_timer, del_tmp, active_timers, list)
249 if (tmp_timer == timer)
250 list_del(&timer->list);
251
252 /* Disable 1ms irq if there is no any active timer */
253 if (list_empty(active_timers))
254 hw_write_otgsc(ci, OTGSC_1MSIE, 0);
255}
256
4dcf720c
LJ		 257/*
258 * Reduce timer count by 1, and find timeout conditions.
259 * Called by otg 1ms timer interrupt
260 */
261static inline int ci_otg_tick_timer(struct ci_hdrc *ci)
262{
263 struct ci_otg_fsm_timer *tmp_timer, *del_tmp;
264 struct list_head *active_timers = &ci->fsm_timer->active_timers;
265 int expired = 0;
266
267 list_for_each_entry_safe(tmp_timer, del_tmp, active_timers, list) {
268 tmp_timer->count--;
269 /* check if timer expires */
270 if (!tmp_timer->count) {
271 list_del(&tmp_timer->list);
272 tmp_timer->function(ci, tmp_timer->data);
273 expired = 1;
274 }
275 }
276
277 /* disable 1ms irq if there is no any timer active */
278 if ((expired == 1) && list_empty(active_timers))
279 hw_write_otgsc(ci, OTGSC_1MSIE, 0);
280
281 return expired;
282}
283
e287b67b
LJ		 284/* The timeout callback function to set time out bit */
285static void set_tmout(void *ptr, unsigned long indicator)
286{
287 *(int *)indicator = 1;
288}
289
290static void set_tmout_and_fsm(void *ptr, unsigned long indicator)
291{
292 struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
293
294 set_tmout(ci, indicator);
295
be6b0c1b 296 ci_otg_queue_work(ci);
e287b67b
LJ		 297}
298
299static void a_wait_vfall_tmout_func(void *ptr, unsigned long indicator)
300{
301 struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
302
303 set_tmout(ci, indicator);
304 /* Disable port power */
305 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP, 0);
306 /* Clear exsiting DP irq */
307 hw_write_otgsc(ci, OTGSC_DPIS, OTGSC_DPIS);
308 /* Enable data pulse irq */
309 hw_write_otgsc(ci, OTGSC_DPIE, OTGSC_DPIE);
be6b0c1b 310 ci_otg_queue_work(ci);
e287b67b
LJ		 311}
312
313static void b_ase0_brst_tmout_func(void *ptr, unsigned long indicator)
314{
315 struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
316
317 set_tmout(ci, indicator);
318 if (!hw_read_otgsc(ci, OTGSC_BSV))
319 ci->fsm.b_sess_vld = 0;
320
be6b0c1b 321 ci_otg_queue_work(ci);
e287b67b
LJ		 322}
323
324static void b_ssend_srp_tmout_func(void *ptr, unsigned long indicator)
325{
326 struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
327
328 set_tmout(ci, indicator);
329
330 /* only vbus fall below B_sess_vld in b_idle state */
e47d9254 331 if (ci->fsm.otg->state == OTG_STATE_B_IDLE)
be6b0c1b 332 ci_otg_queue_work(ci);
e287b67b
LJ		 333}
334
335static void b_sess_vld_tmout_func(void *ptr, unsigned long indicator)
336{
337 struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
338
339 /* Check if A detached */
340 if (!(hw_read_otgsc(ci, OTGSC_BSV))) {
341 ci->fsm.b_sess_vld = 0;
342 ci_otg_add_timer(ci, B_SSEND_SRP);
be6b0c1b 343 ci_otg_queue_work(ci);
e287b67b
LJ		 344 }
345}
346
347static void b_data_pulse_end(void *ptr, unsigned long indicator)
348{
349 struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
350
351 ci->fsm.b_srp_done = 1;
352 ci->fsm.b_bus_req = 0;
353 if (ci->fsm.power_up)
354 ci->fsm.power_up = 0;
355
356 hw_write_otgsc(ci, OTGSC_HABA, 0);
357
be6b0c1b 358 ci_otg_queue_work(ci);
e287b67b
LJ		 359}
360
361/* Initialize timers */
362static int ci_otg_init_timers(struct ci_hdrc *ci)
363{
364 struct otg_fsm *fsm = &ci->fsm;
365
366 /* FSM used timers */
367 ci->fsm_timer->timer_list[A_WAIT_VRISE] =
368 otg_timer_initializer(ci, &set_tmout_and_fsm, TA_WAIT_VRISE,
369 (unsigned long)&fsm->a_wait_vrise_tmout);
370 if (ci->fsm_timer->timer_list[A_WAIT_VRISE] == NULL)
371 return -ENOMEM;
372
373 ci->fsm_timer->timer_list[A_WAIT_VFALL] =
374 otg_timer_initializer(ci, &a_wait_vfall_tmout_func,
375 TA_WAIT_VFALL, (unsigned long)&fsm->a_wait_vfall_tmout);
376 if (ci->fsm_timer->timer_list[A_WAIT_VFALL] == NULL)
377 return -ENOMEM;
378
379 ci->fsm_timer->timer_list[A_WAIT_BCON] =
380 otg_timer_initializer(ci, &set_tmout_and_fsm, TA_WAIT_BCON,
381 (unsigned long)&fsm->a_wait_bcon_tmout);
382 if (ci->fsm_timer->timer_list[A_WAIT_BCON] == NULL)
383 return -ENOMEM;
384
385 ci->fsm_timer->timer_list[A_AIDL_BDIS] =
386 otg_timer_initializer(ci, &set_tmout_and_fsm, TA_AIDL_BDIS,
387 (unsigned long)&fsm->a_aidl_bdis_tmout);
388 if (ci->fsm_timer->timer_list[A_AIDL_BDIS] == NULL)
389 return -ENOMEM;
390
391 ci->fsm_timer->timer_list[A_BIDL_ADIS] =
392 otg_timer_initializer(ci, &set_tmout_and_fsm, TA_BIDL_ADIS,
393 (unsigned long)&fsm->a_bidl_adis_tmout);
394 if (ci->fsm_timer->timer_list[A_BIDL_ADIS] == NULL)
395 return -ENOMEM;
396
397 ci->fsm_timer->timer_list[B_ASE0_BRST] =
398 otg_timer_initializer(ci, &b_ase0_brst_tmout_func, TB_ASE0_BRST,
399 (unsigned long)&fsm->b_ase0_brst_tmout);
400 if (ci->fsm_timer->timer_list[B_ASE0_BRST] == NULL)
401 return -ENOMEM;
402
403 ci->fsm_timer->timer_list[B_SE0_SRP] =
404 otg_timer_initializer(ci, &set_tmout_and_fsm, TB_SE0_SRP,
405 (unsigned long)&fsm->b_se0_srp);
406 if (ci->fsm_timer->timer_list[B_SE0_SRP] == NULL)
407 return -ENOMEM;
408
409 ci->fsm_timer->timer_list[B_SSEND_SRP] =
410 otg_timer_initializer(ci, &b_ssend_srp_tmout_func, TB_SSEND_SRP,
411 (unsigned long)&fsm->b_ssend_srp);
412 if (ci->fsm_timer->timer_list[B_SSEND_SRP] == NULL)
413 return -ENOMEM;
414
415 ci->fsm_timer->timer_list[B_SRP_FAIL] =
416 otg_timer_initializer(ci, &set_tmout, TB_SRP_FAIL,
417 (unsigned long)&fsm->b_srp_done);
418 if (ci->fsm_timer->timer_list[B_SRP_FAIL] == NULL)
419 return -ENOMEM;
420
421 ci->fsm_timer->timer_list[B_DATA_PLS] =
422 otg_timer_initializer(ci, &b_data_pulse_end, TB_DATA_PLS, 0);
423 if (ci->fsm_timer->timer_list[B_DATA_PLS] == NULL)
424 return -ENOMEM;
425
426 ci->fsm_timer->timer_list[B_SESS_VLD] = otg_timer_initializer(ci,
427 &b_sess_vld_tmout_func, TB_SESS_VLD, 0);
428 if (ci->fsm_timer->timer_list[B_SESS_VLD] == NULL)
429 return -ENOMEM;
430
431 return 0;
432}
433
826cfe75
LJ		 434/* -------------------------------------------------------------*/
435/* Operations that will be called from OTG Finite State Machine */
436/* -------------------------------------------------------------*/
437static void ci_otg_fsm_add_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
438{
439 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
440
441 if (t < NUM_OTG_FSM_TIMERS)
442 ci_otg_add_timer(ci, t);
443 return;
444}
445
446static void ci_otg_fsm_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
447{
448 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
449
450 if (t < NUM_OTG_FSM_TIMERS)
451 ci_otg_del_timer(ci, t);
452 return;
453}
454
455/*
456 * A-device drive vbus: turn on vbus regulator and enable port power
457 * Data pulse irq should be disabled while vbus is on.
458 */
459static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on)
460{
461 int ret;
462 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
463
464 if (on) {
465 /* Enable power power */
466 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
467 PORTSC_PP);
468 if (ci->platdata->reg_vbus) {
469 ret = regulator_enable(ci->platdata->reg_vbus);
470 if (ret) {
471 dev_err(ci->dev,
472 "Failed to enable vbus regulator, ret=%d\n",
473 ret);
474 return;
475 }
476 }
477 /* Disable data pulse irq */
478 hw_write_otgsc(ci, OTGSC_DPIE, 0);
479
480 fsm->a_srp_det = 0;
481 fsm->power_up = 0;
482 } else {
483 if (ci->platdata->reg_vbus)
484 regulator_disable(ci->platdata->reg_vbus);
485
486 fsm->a_bus_drop = 1;
487 fsm->a_bus_req = 0;
488 }
489}
490
491/*
492 * Control data line by Run Stop bit.
493 */
494static void ci_otg_loc_conn(struct otg_fsm *fsm, int on)
495{
496 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
497
498 if (on)
499 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
500 else
501 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
502}
503
504/*
505 * Generate SOF by host.
506 * This is controlled through suspend/resume the port.
507 * In host mode, controller will automatically send SOF.
508 * Suspend will block the data on the port.
509 */
510static void ci_otg_loc_sof(struct otg_fsm *fsm, int on)
511{
512 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
513
514 if (on)
515 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_FPR,
516 PORTSC_FPR);
517 else
518 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_SUSP,
519 PORTSC_SUSP);
520}
521
522/*
523 * Start SRP pulsing by data-line pulsing,
524 * no v-bus pulsing followed
525 */
526static void ci_otg_start_pulse(struct otg_fsm *fsm)
527{
528 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
529
530 /* Hardware Assistant Data pulse */
531 hw_write_otgsc(ci, OTGSC_HADP, OTGSC_HADP);
532
533 ci_otg_add_timer(ci, B_DATA_PLS);
534}
535
536static int ci_otg_start_host(struct otg_fsm *fsm, int on)
537{
538 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
539
540 mutex_unlock(&fsm->lock);
541 if (on) {
542 ci_role_stop(ci);
543 ci_role_start(ci, CI_ROLE_HOST);
544 } else {
545 ci_role_stop(ci);
546 hw_device_reset(ci, USBMODE_CM_DC);
547 ci_role_start(ci, CI_ROLE_GADGET);
548 }
549 mutex_lock(&fsm->lock);
550 return 0;
551}
552
553static int ci_otg_start_gadget(struct otg_fsm *fsm, int on)
554{
555 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
556
557 mutex_unlock(&fsm->lock);
558 if (on)
559 usb_gadget_vbus_connect(&ci->gadget);
560 else
561 usb_gadget_vbus_disconnect(&ci->gadget);
562 mutex_lock(&fsm->lock);
563
564 return 0;
565}
566
567static struct otg_fsm_ops ci_otg_ops = {
568 .drv_vbus = ci_otg_drv_vbus,
569 .loc_conn = ci_otg_loc_conn,
570 .loc_sof = ci_otg_loc_sof,
571 .start_pulse = ci_otg_start_pulse,
572 .add_timer = ci_otg_fsm_add_timer,
573 .del_timer = ci_otg_fsm_del_timer,
574 .start_host = ci_otg_start_host,
575 .start_gadget = ci_otg_start_gadget,
576};
577
4dcf720c
LJ		 578int ci_otg_fsm_work(struct ci_hdrc *ci)
579{
580 /*
581 * Don't do fsm transition for B device
582 * when there is no gadget class driver
583 */
584 if (ci->fsm.id && !(ci->driver) &&
e47d9254 585 ci->fsm.otg->state < OTG_STATE_A_IDLE)
4dcf720c
LJ		 586 return 0;
587
588 if (otg_statemachine(&ci->fsm)) {
e47d9254 589 if (ci->fsm.otg->state == OTG_STATE_A_IDLE) {
4dcf720c
LJ		 590 /*
591 * Further state change for cases:
592 * a_idle to b_idle; or
593 * a_idle to a_wait_vrise due to ID change(1->0), so
594 * B-dev becomes A-dev can try to start new session
595 * consequently; or
596 * a_idle to a_wait_vrise when power up
597 */
598 if ((ci->fsm.id) || (ci->id_event) ||
be6b0c1b
PC		 599 (ci->fsm.power_up))
600 ci_otg_queue_work(ci);
4dcf720c
LJ		 601 if (ci->id_event)
602 ci->id_event = false;
e47d9254 603 } else if (ci->fsm.otg->state == OTG_STATE_B_IDLE) {
4dcf720c
LJ		 604 if (ci->fsm.b_sess_vld) {
605 ci->fsm.power_up = 0;
606 /*
607 * Further transite to b_periphearl state
608 * when register gadget driver with vbus on
609 */
be6b0c1b 610 ci_otg_queue_work(ci);
4dcf720c
LJ		 611 }
612 }
613 }
614 return 0;
615}
616
617/*
618 * Update fsm variables in each state if catching expected interrupts,
619 * called by otg fsm isr.
620 */
621static void ci_otg_fsm_event(struct ci_hdrc *ci)
622{
623 u32 intr_sts, otg_bsess_vld, port_conn;
624 struct otg_fsm *fsm = &ci->fsm;
625
626 intr_sts = hw_read_intr_status(ci);
627 otg_bsess_vld = hw_read_otgsc(ci, OTGSC_BSV);
628 port_conn = hw_read(ci, OP_PORTSC, PORTSC_CCS);
629
e47d9254 630 switch (ci->fsm.otg->state) {
4dcf720c
LJ		 631 case OTG_STATE_A_WAIT_BCON:
632 if (port_conn) {
633 fsm->b_conn = 1;
634 fsm->a_bus_req = 1;
be6b0c1b 635 ci_otg_queue_work(ci);
4dcf720c
LJ		 636 }
637 break;
638 case OTG_STATE_B_IDLE:
639 if (otg_bsess_vld && (intr_sts & USBi_PCI) && port_conn) {
640 fsm->b_sess_vld = 1;
be6b0c1b 641 ci_otg_queue_work(ci);
4dcf720c
LJ		 642 }
643 break;
644 case OTG_STATE_B_PERIPHERAL:
645 if ((intr_sts & USBi_SLI) && port_conn && otg_bsess_vld) {
646 fsm->a_bus_suspend = 1;
be6b0c1b 647 ci_otg_queue_work(ci);
4dcf720c
LJ		 648 } else if (intr_sts & USBi_PCI) {
649 if (fsm->a_bus_suspend == 1)
650 fsm->a_bus_suspend = 0;
651 }
652 break;
653 case OTG_STATE_B_HOST:
654 if ((intr_sts & USBi_PCI) && !port_conn) {
655 fsm->a_conn = 0;
656 fsm->b_bus_req = 0;
be6b0c1b 657 ci_otg_queue_work(ci);
4dcf720c
LJ		 658 ci_otg_add_timer(ci, B_SESS_VLD);
659 }
660 break;
661 case OTG_STATE_A_PERIPHERAL:
662 if (intr_sts & USBi_SLI) {
663 fsm->b_bus_suspend = 1;
664 /*
665 * Init a timer to know how long this suspend
666 * will contine, if time out, indicates B no longer
667 * wants to be host role
668 */
669 ci_otg_add_timer(ci, A_BIDL_ADIS);
670 }
671
672 if (intr_sts & USBi_URI)
673 ci_otg_del_timer(ci, A_BIDL_ADIS);
674
675 if (intr_sts & USBi_PCI) {
676 if (fsm->b_bus_suspend == 1) {
677 ci_otg_del_timer(ci, A_BIDL_ADIS);
678 fsm->b_bus_suspend = 0;
679 }
680 }
681 break;
682 case OTG_STATE_A_SUSPEND:
683 if ((intr_sts & USBi_PCI) && !port_conn) {
684 fsm->b_conn = 0;
685
686 /* if gadget driver is binded */
687 if (ci->driver) {
688 /* A device to be peripheral mode */
689 ci->gadget.is_a_peripheral = 1;
690 }
be6b0c1b 691 ci_otg_queue_work(ci);
4dcf720c
LJ		 692 }
693 break;
694 case OTG_STATE_A_HOST:
695 if ((intr_sts & USBi_PCI) && !port_conn) {
696 fsm->b_conn = 0;
be6b0c1b 697 ci_otg_queue_work(ci);
4dcf720c
LJ		 698 }
699 break;
700 case OTG_STATE_B_WAIT_ACON:
701 if ((intr_sts & USBi_PCI) && port_conn) {
702 fsm->a_conn = 1;
be6b0c1b 703 ci_otg_queue_work(ci);
4dcf720c
LJ		 704 }
705 break;
706 default:
707 break;
708 }
709}
710
711/*
712 * ci_otg_irq - otg fsm related irq handling
713 * and also update otg fsm variable by monitoring usb host and udc
714 * state change interrupts.
715 * @ci: ci_hdrc
716 */
717irqreturn_t ci_otg_fsm_irq(struct ci_hdrc *ci)
718{
719 irqreturn_t retval = IRQ_NONE;
720 u32 otgsc, otg_int_src = 0;
721 struct otg_fsm *fsm = &ci->fsm;
722
723 otgsc = hw_read_otgsc(ci, ~0);
724 otg_int_src = otgsc & OTGSC_INT_STATUS_BITS & (otgsc >> 8);
725 fsm->id = (otgsc & OTGSC_ID) ? 1 : 0;
726
727 if (otg_int_src) {
728 if (otg_int_src & OTGSC_1MSIS) {
729 hw_write_otgsc(ci, OTGSC_1MSIS, OTGSC_1MSIS);
730 retval = ci_otg_tick_timer(ci);
731 return IRQ_HANDLED;
732 } else if (otg_int_src & OTGSC_DPIS) {
733 hw_write_otgsc(ci, OTGSC_DPIS, OTGSC_DPIS);
734 fsm->a_srp_det = 1;
735 fsm->a_bus_drop = 0;
736 } else if (otg_int_src & OTGSC_IDIS) {
737 hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
738 if (fsm->id == 0) {
739 fsm->a_bus_drop = 0;
740 fsm->a_bus_req = 1;
741 ci->id_event = true;
742 }
743 } else if (otg_int_src & OTGSC_BSVIS) {
744 hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
745 if (otgsc & OTGSC_BSV) {
746 fsm->b_sess_vld = 1;
747 ci_otg_del_timer(ci, B_SSEND_SRP);
748 ci_otg_del_timer(ci, B_SRP_FAIL);
749 fsm->b_ssend_srp = 0;
750 } else {
751 fsm->b_sess_vld = 0;
752 if (fsm->id)
753 ci_otg_add_timer(ci, B_SSEND_SRP);
754 }
755 } else if (otg_int_src & OTGSC_AVVIS) {
756 hw_write_otgsc(ci, OTGSC_AVVIS, OTGSC_AVVIS);
757 if (otgsc & OTGSC_AVV) {
758 fsm->a_vbus_vld = 1;
759 } else {
760 fsm->a_vbus_vld = 0;
761 fsm->b_conn = 0;
762 }
763 }
be6b0c1b 764 ci_otg_queue_work(ci);
4dcf720c
LJ		 765 return IRQ_HANDLED;
766 }
767
768 ci_otg_fsm_event(ci);
769
770 return retval;
771}
772
773void ci_hdrc_otg_fsm_start(struct ci_hdrc *ci)
774{
be6b0c1b 775 ci_otg_queue_work(ci);
4dcf720c
LJ		 776}
777
57677be5
LJ		 778int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
779{
e287b67b 780 int retval = 0;
57677be5 781
ef44cb42
AT		 782 ci->otg.usb_phy = ci->usb_phy;
783 ci->otg.gadget = &ci->gadget;
784 ci->fsm.otg = &ci->otg;
57677be5
LJ		 785 ci->fsm.power_up = 1;
786 ci->fsm.id = hw_read_otgsc(ci, OTGSC_ID) ? 1 : 0;
e47d9254 787 ci->fsm.otg->state = OTG_STATE_UNDEFINED;
826cfe75 788 ci->fsm.ops = &ci_otg_ops;
57677be5
LJ		 789
790 mutex_init(&ci->fsm.lock);
791
e287b67b
LJ		 792 ci->fsm_timer = devm_kzalloc(ci->dev,
793 sizeof(struct ci_otg_fsm_timer_list), GFP_KERNEL);
794 if (!ci->fsm_timer) {
795 dev_err(ci->dev,
796 "Failed to allocate timer structure for ci hdrc otg!\n");
797 return -ENOMEM;
798 }
799
800 INIT_LIST_HEAD(&ci->fsm_timer->active_timers);
801 retval = ci_otg_init_timers(ci);
802 if (retval) {
803 dev_err(ci->dev, "Couldn't init OTG timers\n");
804 return retval;
805 }
806
15f75def
LJ		 807 retval = sysfs_create_group(&ci->dev->kobj, &inputs_attr_group);
808 if (retval < 0) {
809 dev_dbg(ci->dev,
810 "Can't register sysfs attr group: %d\n", retval);
811 return retval;
812 }
813
57677be5
LJ		 814 /* Enable A vbus valid irq */
815 hw_write_otgsc(ci, OTGSC_AVVIE, OTGSC_AVVIE);
816
817 if (ci->fsm.id) {
818 ci->fsm.b_ssend_srp =
819 hw_read_otgsc(ci, OTGSC_BSV) ? 0 : 1;
820 ci->fsm.b_sess_vld =
821 hw_read_otgsc(ci, OTGSC_BSV) ? 1 : 0;
822 /* Enable BSV irq */
823 hw_write_otgsc(ci, OTGSC_BSVIE, OTGSC_BSVIE);
824 }
825
826 return 0;
827}
15f75def
LJ		 828
829void ci_hdrc_otg_fsm_remove(struct ci_hdrc *ci)
830{
831 sysfs_remove_group(&ci->dev->kobj, &inputs_attr_group);
832}
Linux 6.x block layer and io_uring tree(s)