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otg_fsm.c
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linux-6.19.14/drivers/usb/chipidea/otg_fsm.c
1// SPDX-License-Identifier: GPL-2.0 2/* 3 * otg_fsm.c - ChipIdea USB IP core OTG FSM driver 4 * 5 * Copyright (C) 2014 Freescale Semiconductor, Inc. 6 * 7 * Author: Jun Li 8 */ 9 10/* 11 * This file mainly handles OTG fsm, it includes OTG fsm operations 12 * for HNP and SRP. 13 * 14 * TODO List 15 * - ADP 16 * - OTG test device 17 */ 18 19#include <linux/usb/otg.h> 20#include <linux/usb/gadget.h> 21#include <linux/usb/hcd.h> 22#include <linux/usb/chipidea.h> 23#include <linux/regulator/consumer.h> 24 25#include "ci.h" 26#include "bits.h" 27#include "otg.h" 28#include "otg_fsm.h" 29 30/* Add for otg: interact with user space app */ 31static ssize_t 32a_bus_req_show(struct device *dev, struct device_attribute *attr, char *buf) 33{ 34 char *next; 35 unsigned size, t; 36 struct ci_hdrc *ci = dev_get_drvdata(dev); 37 38 next = buf; 39 size = PAGE_SIZE; 40 t = scnprintf(next, size, "%d\n", ci->fsm.a_bus_req); 41 size -= t; 42 next += t; 43 44 return PAGE_SIZE - size; 45} 46 47static ssize_t 48a_bus_req_store(struct device *dev, struct device_attribute *attr, 49 const char *buf, size_t count) 50{ 51 struct ci_hdrc *ci = dev_get_drvdata(dev); 52 53 if (count > 2) 54 return -1; 55 56 mutex_lock(&ci->fsm.lock); 57 if (buf[0] == '0') { 58 ci->fsm.a_bus_req = 0; 59 } else if (buf[0] == '1') { 60 /* If a_bus_drop is TRUE, a_bus_req can't be set */ 61 if (ci->fsm.a_bus_drop) { 62 mutex_unlock(&ci->fsm.lock); 63 return count; 64 } 65 ci->fsm.a_bus_req = 1; 66 if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) { 67 ci->gadget.host_request_flag = 1; 68 mutex_unlock(&ci->fsm.lock); 69 return count; 70 } 71 } 72 73 ci_otg_queue_work(ci); 74 mutex_unlock(&ci->fsm.lock); 75 76 return count; 77} 78static DEVICE_ATTR_RW(a_bus_req); 79 80static ssize_t 81a_bus_drop_show(struct device *dev, struct device_attribute *attr, char *buf) 82{ 83 char *next; 84 unsigned size, t; 85 struct ci_hdrc *ci = dev_get_drvdata(dev); 86 87 next = buf; 88 size = PAGE_SIZE; 89 t = scnprintf(next, size, "%d\n", ci->fsm.a_bus_drop); 90 size -= t; 91 next += t; 92 93 return PAGE_SIZE - size; 94} 95 96static ssize_t 97a_bus_drop_store(struct device *dev, struct device_attribute *attr, 98 const char *buf, size_t count) 99{ 100 struct ci_hdrc *ci = dev_get_drvdata(dev); 101 102 if (count > 2) 103 return -1; 104 105 mutex_lock(&ci->fsm.lock); 106 if (buf[0] == '0') { 107 ci->fsm.a_bus_drop = 0; 108 } else if (buf[0] == '1') { 109 ci->fsm.a_bus_drop = 1; 110 ci->fsm.a_bus_req = 0; 111 } 112 113 ci_otg_queue_work(ci); 114 mutex_unlock(&ci->fsm.lock); 115 116 return count; 117} 118static DEVICE_ATTR_RW(a_bus_drop); 119 120static ssize_t 121b_bus_req_show(struct device *dev, struct device_attribute *attr, char *buf) 122{ 123 char *next; 124 unsigned size, t; 125 struct ci_hdrc *ci = dev_get_drvdata(dev); 126 127 next = buf; 128 size = PAGE_SIZE; 129 t = scnprintf(next, size, "%d\n", ci->fsm.b_bus_req); 130 size -= t; 131 next += t; 132 133 return PAGE_SIZE - size; 134} 135 136static ssize_t 137b_bus_req_store(struct device *dev, struct device_attribute *attr, 138 const char *buf, size_t count) 139{ 140 struct ci_hdrc *ci = dev_get_drvdata(dev); 141 142 if (count > 2) 143 return -1; 144 145 mutex_lock(&ci->fsm.lock); 146 if (buf[0] == '0') 147 ci->fsm.b_bus_req = 0; 148 else if (buf[0] == '1') { 149 ci->fsm.b_bus_req = 1; 150 if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) { 151 ci->gadget.host_request_flag = 1; 152 mutex_unlock(&ci->fsm.lock); 153 return count; 154 } 155 } 156 157 ci_otg_queue_work(ci); 158 mutex_unlock(&ci->fsm.lock); 159 160 return count; 161} 162static DEVICE_ATTR_RW(b_bus_req); 163 164static ssize_t 165a_clr_err_store(struct device *dev, struct device_attribute *attr, 166 const char *buf, size_t count) 167{ 168 struct ci_hdrc *ci = dev_get_drvdata(dev); 169 170 if (count > 2) 171 return -1; 172 173 mutex_lock(&ci->fsm.lock); 174 if (buf[0] == '1') 175 ci->fsm.a_clr_err = 1; 176 177 ci_otg_queue_work(ci); 178 mutex_unlock(&ci->fsm.lock); 179 180 return count; 181} 182static DEVICE_ATTR_WO(a_clr_err); 183 184static struct attribute *inputs_attrs[] = { 185 &dev_attr_a_bus_req.attr, 186 &dev_attr_a_bus_drop.attr, 187 &dev_attr_b_bus_req.attr, 188 &dev_attr_a_clr_err.attr, 189 NULL, 190}; 191 192static const struct attribute_group inputs_attr_group = { 193 .name = "inputs", 194 .attrs = inputs_attrs, 195}; 196 197/* 198 * Keep this list in the same order as timers indexed 199 * by enum otg_fsm_timer in include/linux/usb/otg-fsm.h 200 */ 201static unsigned otg_timer_ms[] = { 202 TA_WAIT_VRISE, 203 TA_WAIT_VFALL, 204 TA_WAIT_BCON, 205 TA_AIDL_BDIS, 206 TB_ASE0_BRST, 207 TA_BIDL_ADIS, 208 TB_AIDL_BDIS, 209 TB_SE0_SRP, 210 TB_SRP_FAIL, 211 0, 212 TB_DATA_PLS, 213 TB_SSEND_SRP, 214}; 215 216/* 217 * Add timer to active timer list 218 */ 219static void ci_otg_add_timer(struct ci_hdrc *ci, enum otg_fsm_timer t) 220{ 221 unsigned long flags, timer_sec, timer_nsec; 222 223 if (t >= NUM_OTG_FSM_TIMERS) 224 return; 225 226 spin_lock_irqsave(&ci->lock, flags); 227 timer_sec = otg_timer_ms[t] / MSEC_PER_SEC; 228 timer_nsec = (otg_timer_ms[t] % MSEC_PER_SEC) * NSEC_PER_MSEC; 229 ci->hr_timeouts[t] = ktime_add(ktime_get(), 230 ktime_set(timer_sec, timer_nsec)); 231 ci->enabled_otg_timer_bits |= (1 << t); 232 if ((ci->next_otg_timer == NUM_OTG_FSM_TIMERS) || 233 ktime_after(ci->hr_timeouts[ci->next_otg_timer], 234 ci->hr_timeouts[t])) { 235 ci->next_otg_timer = t; 236 hrtimer_start_range_ns(&ci->otg_fsm_hrtimer, 237 ci->hr_timeouts[t], NSEC_PER_MSEC, 238 HRTIMER_MODE_ABS); 239 } 240 spin_unlock_irqrestore(&ci->lock, flags); 241} 242 243/* 244 * Remove timer from active timer list 245 */ 246static void ci_otg_del_timer(struct ci_hdrc *ci, enum otg_fsm_timer t) 247{ 248 unsigned long flags, enabled_timer_bits; 249 enum otg_fsm_timer cur_timer, next_timer = NUM_OTG_FSM_TIMERS; 250 251 if ((t >= NUM_OTG_FSM_TIMERS) || 252 !(ci->enabled_otg_timer_bits & (1 << t))) 253 return; 254 255 spin_lock_irqsave(&ci->lock, flags); 256 ci->enabled_otg_timer_bits &= ~(1 << t); 257 if (ci->next_otg_timer == t) { 258 if (ci->enabled_otg_timer_bits == 0) { 259 spin_unlock_irqrestore(&ci->lock, flags); 260 /* No enabled timers after delete it */ 261 hrtimer_cancel(&ci->otg_fsm_hrtimer); 262 spin_lock_irqsave(&ci->lock, flags); 263 ci->next_otg_timer = NUM_OTG_FSM_TIMERS; 264 } else { 265 /* Find the next timer */ 266 enabled_timer_bits = ci->enabled_otg_timer_bits; 267 for_each_set_bit(cur_timer, &enabled_timer_bits, 268 NUM_OTG_FSM_TIMERS) { 269 if ((next_timer == NUM_OTG_FSM_TIMERS) || 270 ktime_before(ci->hr_timeouts[next_timer], 271 ci->hr_timeouts[cur_timer])) 272 next_timer = cur_timer; 273 } 274 } 275 } 276 if (next_timer != NUM_OTG_FSM_TIMERS) { 277 ci->next_otg_timer = next_timer; 278 hrtimer_start_range_ns(&ci->otg_fsm_hrtimer, 279 ci->hr_timeouts[next_timer], NSEC_PER_MSEC, 280 HRTIMER_MODE_ABS); 281 } 282 spin_unlock_irqrestore(&ci->lock, flags); 283} 284 285/* OTG FSM timer handlers */ 286static int a_wait_vrise_tmout(struct ci_hdrc *ci) 287{ 288 ci->fsm.a_wait_vrise_tmout = 1; 289 return 0; 290} 291 292static int a_wait_vfall_tmout(struct ci_hdrc *ci) 293{ 294 ci->fsm.a_wait_vfall_tmout = 1; 295 return 0; 296} 297 298static int a_wait_bcon_tmout(struct ci_hdrc *ci) 299{ 300 ci->fsm.a_wait_bcon_tmout = 1; 301 return 0; 302} 303 304static int a_aidl_bdis_tmout(struct ci_hdrc *ci) 305{ 306 ci->fsm.a_aidl_bdis_tmout = 1; 307 return 0; 308} 309 310static int b_ase0_brst_tmout(struct ci_hdrc *ci) 311{ 312 ci->fsm.b_ase0_brst_tmout = 1; 313 return 0; 314} 315 316static int a_bidl_adis_tmout(struct ci_hdrc *ci) 317{ 318 ci->fsm.a_bidl_adis_tmout = 1; 319 return 0; 320} 321 322static int b_aidl_bdis_tmout(struct ci_hdrc *ci) 323{ 324 ci->fsm.a_bus_suspend = 1; 325 return 0; 326} 327 328static int b_se0_srp_tmout(struct ci_hdrc *ci) 329{ 330 ci->fsm.b_se0_srp = 1; 331 return 0; 332} 333 334static int b_srp_fail_tmout(struct ci_hdrc *ci) 335{ 336 ci->fsm.b_srp_done = 1; 337 return 1; 338} 339 340static int b_data_pls_tmout(struct ci_hdrc *ci) 341{ 342 ci->fsm.b_srp_done = 1; 343 ci->fsm.b_bus_req = 0; 344 if (ci->fsm.power_up) 345 ci->fsm.power_up = 0; 346 hw_write_otgsc(ci, OTGSC_HABA, 0); 347 pm_runtime_put(ci->dev); 348 return 0; 349} 350 351static int b_ssend_srp_tmout(struct ci_hdrc *ci) 352{ 353 ci->fsm.b_ssend_srp = 1; 354 /* only vbus fall below B_sess_vld in b_idle state */ 355 if (ci->fsm.otg->state == OTG_STATE_B_IDLE) 356 return 0; 357 else 358 return 1; 359} 360 361/* 362 * Keep this list in the same order as timers indexed 363 * by enum otg_fsm_timer in include/linux/usb/otg-fsm.h 364 */ 365static int (*otg_timer_handlers[])(struct ci_hdrc *) = { 366 a_wait_vrise_tmout, /* A_WAIT_VRISE */ 367 a_wait_vfall_tmout, /* A_WAIT_VFALL */ 368 a_wait_bcon_tmout, /* A_WAIT_BCON */ 369 a_aidl_bdis_tmout, /* A_AIDL_BDIS */ 370 b_ase0_brst_tmout, /* B_ASE0_BRST */ 371 a_bidl_adis_tmout, /* A_BIDL_ADIS */ 372 b_aidl_bdis_tmout, /* B_AIDL_BDIS */ 373 b_se0_srp_tmout, /* B_SE0_SRP */ 374 b_srp_fail_tmout, /* B_SRP_FAIL */ 375 NULL, /* A_WAIT_ENUM */ 376 b_data_pls_tmout, /* B_DATA_PLS */ 377 b_ssend_srp_tmout, /* B_SSEND_SRP */ 378}; 379 380/* 381 * Enable the next nearest enabled timer if have 382 */ 383static enum hrtimer_restart ci_otg_hrtimer_func(struct hrtimer *t) 384{ 385 struct ci_hdrc *ci = container_of(t, struct ci_hdrc, otg_fsm_hrtimer); 386 ktime_t now, *timeout; 387 unsigned long enabled_timer_bits; 388 unsigned long flags; 389 enum otg_fsm_timer cur_timer, next_timer = NUM_OTG_FSM_TIMERS; 390 int ret = -EINVAL; 391 392 spin_lock_irqsave(&ci->lock, flags); 393 enabled_timer_bits = ci->enabled_otg_timer_bits; 394 ci->next_otg_timer = NUM_OTG_FSM_TIMERS; 395 396 now = ktime_get(); 397 for_each_set_bit(cur_timer, &enabled_timer_bits, NUM_OTG_FSM_TIMERS) { 398 if (ktime_compare(now, ci->hr_timeouts[cur_timer]) >= 0) { 399 ci->enabled_otg_timer_bits &= ~(1 << cur_timer); 400 if (otg_timer_handlers[cur_timer]) 401 ret = otg_timer_handlers[cur_timer](ci); 402 } else { 403 if ((next_timer == NUM_OTG_FSM_TIMERS) || 404 ktime_before(ci->hr_timeouts[cur_timer], 405 ci->hr_timeouts[next_timer])) 406 next_timer = cur_timer; 407 } 408 } 409 /* Enable the next nearest timer */ 410 if (next_timer < NUM_OTG_FSM_TIMERS) { 411 timeout = &ci->hr_timeouts[next_timer]; 412 hrtimer_start_range_ns(&ci->otg_fsm_hrtimer, *timeout, 413 NSEC_PER_MSEC, HRTIMER_MODE_ABS); 414 ci->next_otg_timer = next_timer; 415 } 416 spin_unlock_irqrestore(&ci->lock, flags); 417 418 if (!ret) 419 ci_otg_queue_work(ci); 420 421 return HRTIMER_NORESTART; 422} 423 424/* Initialize timers */ 425static int ci_otg_init_timers(struct ci_hdrc *ci) 426{ 427 hrtimer_setup(&ci->otg_fsm_hrtimer, ci_otg_hrtimer_func, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); 428 429 return 0; 430} 431 432/* -------------------------------------------------------------*/ 433/* Operations that will be called from OTG Finite State Machine */ 434/* -------------------------------------------------------------*/ 435static void ci_otg_fsm_add_timer(struct otg_fsm *fsm, enum otg_fsm_timer t) 436{ 437 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm); 438 439 if (t < NUM_OTG_FSM_TIMERS) 440 ci_otg_add_timer(ci, t); 441 return; 442} 443 444static void ci_otg_fsm_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer t) 445{ 446 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm); 447 448 if (t < NUM_OTG_FSM_TIMERS) 449 ci_otg_del_timer(ci, t); 450 return; 451} 452 453/* 454 * A-device drive vbus: turn on vbus regulator and enable port power 455 * Data pulse irq should be disabled while vbus is on. 456 */ 457static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on) 458{ 459 int ret; 460 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm); 461 462 if (on) { 463 /* Enable power */ 464 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP, 465 PORTSC_PP); 466 if (ci->platdata->reg_vbus) { 467 ret = regulator_enable(ci->platdata->reg_vbus); 468 if (ret) { 469 dev_err(ci->dev, 470 "Failed to enable vbus regulator, ret=%d\n", 471 ret); 472 return; 473 } 474 } 475 476 if (ci->platdata->flags & CI_HDRC_PHY_VBUS_CONTROL) 477 usb_phy_vbus_on(ci->usb_phy); 478 479 /* Disable data pulse irq */ 480 hw_write_otgsc(ci, OTGSC_DPIE, 0); 481 482 fsm->a_srp_det = 0; 483 fsm->power_up = 0; 484 } else { 485 if (ci->platdata->reg_vbus) 486 regulator_disable(ci->platdata->reg_vbus); 487 488 if (ci->platdata->flags & CI_HDRC_PHY_VBUS_CONTROL) 489 usb_phy_vbus_off(ci->usb_phy); 490 491 fsm->a_bus_drop = 1; 492 fsm->a_bus_req = 0; 493 } 494} 495 496/* 497 * Control data line by Run Stop bit. 498 */ 499static void ci_otg_loc_conn(struct otg_fsm *fsm, int on) 500{ 501 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm); 502 503 if (on) 504 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS); 505 else 506 hw_write(ci, OP_USBCMD, USBCMD_RS, 0); 507} 508 509/* 510 * Generate SOF by host. 511 * In host mode, controller will automatically send SOF. 512 * Suspend will block the data on the port. 513 * 514 * This is controlled through usbcore by usb autosuspend, 515 * so the usb device class driver need support autosuspend, 516 * otherwise the bus suspend will not happen. 517 */ 518static void ci_otg_loc_sof(struct otg_fsm *fsm, int on) 519{ 520 struct usb_device *udev; 521 522 if (!fsm->otg->host) 523 return; 524 525 udev = usb_hub_find_child(fsm->otg->host->root_hub, 1); 526 if (!udev) 527 return; 528 529 if (on) { 530 usb_disable_autosuspend(udev); 531 } else { 532 pm_runtime_set_autosuspend_delay(&udev->dev, 0); 533 usb_enable_autosuspend(udev); 534 } 535} 536 537/* 538 * Start SRP pulsing by data-line pulsing, 539 * no v-bus pulsing followed 540 */ 541static void ci_otg_start_pulse(struct otg_fsm *fsm) 542{ 543 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm); 544 545 /* Hardware Assistant Data pulse */ 546 hw_write_otgsc(ci, OTGSC_HADP, OTGSC_HADP); 547 548 pm_runtime_get(ci->dev); 549 ci_otg_add_timer(ci, B_DATA_PLS); 550} 551 552static int ci_otg_start_host(struct otg_fsm *fsm, int on) 553{ 554 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm); 555 556 if (on) { 557 ci_role_stop(ci); 558 ci_role_start(ci, CI_ROLE_HOST); 559 } else { 560 ci_role_stop(ci); 561 ci_role_start(ci, CI_ROLE_GADGET); 562 } 563 return 0; 564} 565 566static int ci_otg_start_gadget(struct otg_fsm *fsm, int on) 567{ 568 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm); 569 570 if (on) 571 usb_gadget_vbus_connect(&ci->gadget); 572 else 573 usb_gadget_vbus_disconnect(&ci->gadget); 574 575 return 0; 576} 577 578static struct otg_fsm_ops ci_otg_ops = { 579 .drv_vbus = ci_otg_drv_vbus, 580 .loc_conn = ci_otg_loc_conn, 581 .loc_sof = ci_otg_loc_sof, 582 .start_pulse = ci_otg_start_pulse, 583 .add_timer = ci_otg_fsm_add_timer, 584 .del_timer = ci_otg_fsm_del_timer, 585 .start_host = ci_otg_start_host, 586 .start_gadget = ci_otg_start_gadget, 587}; 588 589int ci_otg_fsm_work(struct ci_hdrc *ci) 590{ 591 /* 592 * Don't do fsm transition for B device 593 * when there is no gadget class driver 594 */ 595 if (ci->fsm.id && !(ci->driver) && 596 ci->fsm.otg->state < OTG_STATE_A_IDLE) 597 return 0; 598 599 pm_runtime_get_sync(ci->dev); 600 if (otg_statemachine(&ci->fsm)) { 601 if (ci->fsm.otg->state == OTG_STATE_A_IDLE) { 602 /* 603 * Further state change for cases: 604 * a_idle to b_idle; or 605 * a_idle to a_wait_vrise due to ID change(1->0), so 606 * B-dev becomes A-dev can try to start new session 607 * consequently; or 608 * a_idle to a_wait_vrise when power up 609 */ 610 if ((ci->fsm.id) || (ci->id_event) || 611 (ci->fsm.power_up)) { 612 ci_otg_queue_work(ci); 613 } else { 614 /* Enable data pulse irq */ 615 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | 616 PORTSC_PP, 0); 617 hw_write_otgsc(ci, OTGSC_DPIS, OTGSC_DPIS); 618 hw_write_otgsc(ci, OTGSC_DPIE, OTGSC_DPIE); 619 } 620 if (ci->id_event) 621 ci->id_event = false; 622 } else if (ci->fsm.otg->state == OTG_STATE_B_IDLE) { 623 if (ci->fsm.b_sess_vld) { 624 ci->fsm.power_up = 0; 625 /* 626 * Further transite to b_periphearl state 627 * when register gadget driver with vbus on 628 */ 629 ci_otg_queue_work(ci); 630 } 631 } else if (ci->fsm.otg->state == OTG_STATE_A_HOST) { 632 pm_runtime_put_autosuspend(ci->dev); 633 return 0; 634 } 635 } 636 pm_runtime_put_sync(ci->dev); 637 return 0; 638} 639 640/* 641 * Update fsm variables in each state if catching expected interrupts, 642 * called by otg fsm isr. 643 */ 644static void ci_otg_fsm_event(struct ci_hdrc *ci) 645{ 646 u32 intr_sts, otg_bsess_vld, port_conn; 647 struct otg_fsm *fsm = &ci->fsm; 648 649 intr_sts = hw_read_intr_status(ci); 650 otg_bsess_vld = hw_read_otgsc(ci, OTGSC_BSV); 651 port_conn = hw_read(ci, OP_PORTSC, PORTSC_CCS); 652 653 switch (ci->fsm.otg->state) { 654 case OTG_STATE_A_WAIT_BCON: 655 if (port_conn) { 656 fsm->b_conn = 1; 657 fsm->a_bus_req = 1; 658 ci_otg_queue_work(ci); 659 } 660 break; 661 case OTG_STATE_B_IDLE: 662 if (otg_bsess_vld && (intr_sts & USBi_PCI) && port_conn) { 663 fsm->b_sess_vld = 1; 664 ci_otg_queue_work(ci); 665 } 666 break; 667 case OTG_STATE_B_PERIPHERAL: 668 if ((intr_sts & USBi_SLI) && port_conn && otg_bsess_vld) { 669 ci_otg_add_timer(ci, B_AIDL_BDIS); 670 } else if (intr_sts & USBi_PCI) { 671 ci_otg_del_timer(ci, B_AIDL_BDIS); 672 if (fsm->a_bus_suspend == 1) 673 fsm->a_bus_suspend = 0; 674 } 675 break; 676 case OTG_STATE_B_HOST: 677 if ((intr_sts & USBi_PCI) && !port_conn) { 678 fsm->a_conn = 0; 679 fsm->b_bus_req = 0; 680 ci_otg_queue_work(ci); 681 } 682 break; 683 case OTG_STATE_A_PERIPHERAL: 684 if (intr_sts & USBi_SLI) { 685 fsm->b_bus_suspend = 1; 686 /* 687 * Init a timer to know how long this suspend 688 * will continue, if time out, indicates B no longer 689 * wants to be host role 690 */ 691 ci_otg_add_timer(ci, A_BIDL_ADIS); 692 } 693 694 if (intr_sts & USBi_URI) 695 ci_otg_del_timer(ci, A_BIDL_ADIS); 696 697 if (intr_sts & USBi_PCI) { 698 if (fsm->b_bus_suspend == 1) { 699 ci_otg_del_timer(ci, A_BIDL_ADIS); 700 fsm->b_bus_suspend = 0; 701 } 702 } 703 break; 704 case OTG_STATE_A_SUSPEND: 705 if ((intr_sts & USBi_PCI) && !port_conn) { 706 fsm->b_conn = 0; 707 708 /* if gadget driver is binded */ 709 if (ci->driver) { 710 /* A device to be peripheral mode */ 711 ci->gadget.is_a_peripheral = 1; 712 } 713 ci_otg_queue_work(ci); 714 } 715 break; 716 case OTG_STATE_A_HOST: 717 if ((intr_sts & USBi_PCI) && !port_conn) { 718 fsm->b_conn = 0; 719 ci_otg_queue_work(ci); 720 } 721 break; 722 case OTG_STATE_B_WAIT_ACON: 723 if ((intr_sts & USBi_PCI) && port_conn) { 724 fsm->a_conn = 1; 725 ci_otg_queue_work(ci); 726 } 727 break; 728 default: 729 break; 730 } 731} 732 733/* 734 * ci_otg_irq - otg fsm related irq handling 735 * and also update otg fsm variable by monitoring usb host and udc 736 * state change interrupts. 737 * @ci: ci_hdrc 738 */ 739irqreturn_t ci_otg_fsm_irq(struct ci_hdrc *ci) 740{ 741 irqreturn_t retval = IRQ_NONE; 742 u32 otgsc, otg_int_src = 0; 743 struct otg_fsm *fsm = &ci->fsm; 744 745 otgsc = hw_read_otgsc(ci, ~0); 746 otg_int_src = otgsc & OTGSC_INT_STATUS_BITS & (otgsc >> 8); 747 fsm->id = (otgsc & OTGSC_ID) ? 1 : 0; 748 749 if (otg_int_src) { 750 if (otg_int_src & OTGSC_DPIS) { 751 hw_write_otgsc(ci, OTGSC_DPIS, OTGSC_DPIS); 752 fsm->a_srp_det = 1; 753 fsm->a_bus_drop = 0; 754 } else if (otg_int_src & OTGSC_IDIS) { 755 hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS); 756 if (fsm->id == 0) { 757 fsm->a_bus_drop = 0; 758 fsm->a_bus_req = 1; 759 ci->id_event = true; 760 } 761 } else if (otg_int_src & OTGSC_BSVIS) { 762 hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS); 763 if (otgsc & OTGSC_BSV) { 764 fsm->b_sess_vld = 1; 765 ci_otg_del_timer(ci, B_SSEND_SRP); 766 ci_otg_del_timer(ci, B_SRP_FAIL); 767 fsm->b_ssend_srp = 0; 768 } else { 769 fsm->b_sess_vld = 0; 770 if (fsm->id) 771 ci_otg_add_timer(ci, B_SSEND_SRP); 772 } 773 } else if (otg_int_src & OTGSC_AVVIS) { 774 hw_write_otgsc(ci, OTGSC_AVVIS, OTGSC_AVVIS); 775 if (otgsc & OTGSC_AVV) { 776 fsm->a_vbus_vld = 1; 777 } else { 778 fsm->a_vbus_vld = 0; 779 fsm->b_conn = 0; 780 } 781 } 782 ci_otg_queue_work(ci); 783 return IRQ_HANDLED; 784 } 785 786 ci_otg_fsm_event(ci); 787 788 return retval; 789} 790 791void ci_hdrc_otg_fsm_start(struct ci_hdrc *ci) 792{ 793 ci_otg_queue_work(ci); 794} 795 796int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci) 797{ 798 int retval = 0; 799 800 if (ci->phy) 801 ci->otg.phy = ci->phy; 802 else 803 ci->otg.usb_phy = ci->usb_phy; 804 805 ci->otg.gadget = &ci->gadget; 806 ci->fsm.otg = &ci->otg; 807 ci->fsm.power_up = 1; 808 ci->fsm.id = hw_read_otgsc(ci, OTGSC_ID) ? 1 : 0; 809 ci->fsm.otg->state = OTG_STATE_UNDEFINED; 810 ci->fsm.ops = &ci_otg_ops; 811 ci->gadget.hnp_polling_support = 1; 812 ci->fsm.host_req_flag = devm_kzalloc(ci->dev, 1, GFP_KERNEL); 813 if (!ci->fsm.host_req_flag) 814 return -ENOMEM; 815 816 mutex_init(&ci->fsm.lock); 817 818 retval = ci_otg_init_timers(ci); 819 if (retval) { 820 dev_err(ci->dev, "Couldn't init OTG timers\n"); 821 return retval; 822 } 823 ci->enabled_otg_timer_bits = 0; 824 ci->next_otg_timer = NUM_OTG_FSM_TIMERS; 825 826 retval = sysfs_create_group(&ci->dev->kobj, &inputs_attr_group); 827 if (retval < 0) { 828 dev_dbg(ci->dev, 829 "Can't register sysfs attr group: %d\n", retval); 830 return retval; 831 } 832 833 /* Enable A vbus valid irq */ 834 hw_write_otgsc(ci, OTGSC_AVVIE, OTGSC_AVVIE); 835 836 if (ci->fsm.id) { 837 ci->fsm.b_ssend_srp = 838 hw_read_otgsc(ci, OTGSC_BSV) ? 0 : 1; 839 ci->fsm.b_sess_vld = 840 hw_read_otgsc(ci, OTGSC_BSV) ? 1 : 0; 841 /* Enable BSV irq */ 842 hw_write_otgsc(ci, OTGSC_BSVIE, OTGSC_BSVIE); 843 } 844 845 return 0; 846} 847 848void ci_hdrc_otg_fsm_remove(struct ci_hdrc *ci) 849{ 850 sysfs_remove_group(&ci->dev->kobj, &inputs_attr_group); 851}
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