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 */ 31 static ssize_t 32 a_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 47 static ssize_t 48 a_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 } 78 static DEVICE_ATTR_RW(a_bus_req); 79 80 static ssize_t 81 a_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 96 static ssize_t 97 a_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 } 118 static DEVICE_ATTR_RW(a_bus_drop); 119 120 static ssize_t 121 b_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 } 135 136 static ssize_t 137 b_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 } 162 static DEVICE_ATTR_RW(b_bus_req); 163 164 static ssize_t 165 a_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 } 182 static DEVICE_ATTR_WO(a_clr_err); 183 184 static 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 }; 191 192 static 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 */ 201 static 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 */ 219 static 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 */ 246 static 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 /* No enabled timers after delete it */ 260 hrtimer_cancel(&ci->otg_fsm_hrtimer); 261 ci->next_otg_timer = NUM_OTG_FSM_TIMERS; 262 } else { 263 /* Find the next timer */ 264 enabled_timer_bits = ci->enabled_otg_timer_bits; 265 for_each_set_bit(cur_timer, &enabled_timer_bits, 266 NUM_OTG_FSM_TIMERS) { 267 if ((next_timer == NUM_OTG_FSM_TIMERS) || 268 ktime_before(ci->hr_timeouts[next_timer], 269 ci->hr_timeouts[cur_timer])) 270 next_timer = cur_timer; 271 } 272 } 273 } 274 if (next_timer != NUM_OTG_FSM_TIMERS) { 275 ci->next_otg_timer = next_timer; 276 hrtimer_start_range_ns(&ci->otg_fsm_hrtimer, 277 ci->hr_timeouts[next_timer], NSEC_PER_MSEC, 278 HRTIMER_MODE_ABS); 279 } 280 spin_unlock_irqrestore(&ci->lock, flags); 281 } 282 283 /* OTG FSM timer handlers */ 284 static int a_wait_vrise_tmout(struct ci_hdrc *ci) 285 { 286 ci->fsm.a_wait_vrise_tmout = 1; 287 return 0; 288 } 289 290 static int a_wait_vfall_tmout(struct ci_hdrc *ci) 291 { 292 ci->fsm.a_wait_vfall_tmout = 1; 293 return 0; 294 } 295 296 static int a_wait_bcon_tmout(struct ci_hdrc *ci) 297 { 298 ci->fsm.a_wait_bcon_tmout = 1; 299 return 0; 300 } 301 302 static int a_aidl_bdis_tmout(struct ci_hdrc *ci) 303 { 304 ci->fsm.a_aidl_bdis_tmout = 1; 305 return 0; 306 } 307 308 static int b_ase0_brst_tmout(struct ci_hdrc *ci) 309 { 310 ci->fsm.b_ase0_brst_tmout = 1; 311 return 0; 312 } 313 314 static int a_bidl_adis_tmout(struct ci_hdrc *ci) 315 { 316 ci->fsm.a_bidl_adis_tmout = 1; 317 return 0; 318 } 319 320 static int b_aidl_bdis_tmout(struct ci_hdrc *ci) 321 { 322 ci->fsm.a_bus_suspend = 1; 323 return 0; 324 } 325 326 static int b_se0_srp_tmout(struct ci_hdrc *ci) 327 { 328 ci->fsm.b_se0_srp = 1; 329 return 0; 330 } 331 332 static int b_srp_fail_tmout(struct ci_hdrc *ci) 333 { 334 ci->fsm.b_srp_done = 1; 335 return 1; 336 } 337 338 static int b_data_pls_tmout(struct ci_hdrc *ci) 339 { 340 ci->fsm.b_srp_done = 1; 341 ci->fsm.b_bus_req = 0; 342 if (ci->fsm.power_up) 343 ci->fsm.power_up = 0; 344 hw_write_otgsc(ci, OTGSC_HABA, 0); 345 pm_runtime_put(ci->dev); 346 return 0; 347 } 348 349 static int b_ssend_srp_tmout(struct ci_hdrc *ci) 350 { 351 ci->fsm.b_ssend_srp = 1; 352 /* only vbus fall below B_sess_vld in b_idle state */ 353 if (ci->fsm.otg->state == OTG_STATE_B_IDLE) 354 return 0; 355 else 356 return 1; 357 } 358 359 /* 360 * Keep this list in the same order as timers indexed 361 * by enum otg_fsm_timer in include/linux/usb/otg-fsm.h 362 */ 363 static int (*otg_timer_handlers[])(struct ci_hdrc *) = { 364 a_wait_vrise_tmout, /* A_WAIT_VRISE */ 365 a_wait_vfall_tmout, /* A_WAIT_VFALL */ 366 a_wait_bcon_tmout, /* A_WAIT_BCON */ 367 a_aidl_bdis_tmout, /* A_AIDL_BDIS */ 368 b_ase0_brst_tmout, /* B_ASE0_BRST */ 369 a_bidl_adis_tmout, /* A_BIDL_ADIS */ 370 b_aidl_bdis_tmout, /* B_AIDL_BDIS */ 371 b_se0_srp_tmout, /* B_SE0_SRP */ 372 b_srp_fail_tmout, /* B_SRP_FAIL */ 373 NULL, /* A_WAIT_ENUM */ 374 b_data_pls_tmout, /* B_DATA_PLS */ 375 b_ssend_srp_tmout, /* B_SSEND_SRP */ 376 }; 377 378 /* 379 * Enable the next nearest enabled timer if have 380 */ 381 static enum hrtimer_restart ci_otg_hrtimer_func(struct hrtimer *t) 382 { 383 struct ci_hdrc *ci = container_of(t, struct ci_hdrc, otg_fsm_hrtimer); 384 ktime_t now, *timeout; 385 unsigned long enabled_timer_bits; 386 unsigned long flags; 387 enum otg_fsm_timer cur_timer, next_timer = NUM_OTG_FSM_TIMERS; 388 int ret = -EINVAL; 389 390 spin_lock_irqsave(&ci->lock, flags); 391 enabled_timer_bits = ci->enabled_otg_timer_bits; 392 ci->next_otg_timer = NUM_OTG_FSM_TIMERS; 393 394 now = ktime_get(); 395 for_each_set_bit(cur_timer, &enabled_timer_bits, NUM_OTG_FSM_TIMERS) { 396 if (ktime_compare(now, ci->hr_timeouts[cur_timer]) >= 0) { 397 ci->enabled_otg_timer_bits &= ~(1 << cur_timer); 398 if (otg_timer_handlers[cur_timer]) 399 ret = otg_timer_handlers[cur_timer](ci); 400 } else { 401 if ((next_timer == NUM_OTG_FSM_TIMERS) || 402 ktime_before(ci->hr_timeouts[cur_timer], 403 ci->hr_timeouts[next_timer])) 404 next_timer = cur_timer; 405 } 406 } 407 /* Enable the next nearest timer */ 408 if (next_timer < NUM_OTG_FSM_TIMERS) { 409 timeout = &ci->hr_timeouts[next_timer]; 410 hrtimer_start_range_ns(&ci->otg_fsm_hrtimer, *timeout, 411 NSEC_PER_MSEC, HRTIMER_MODE_ABS); 412 ci->next_otg_timer = next_timer; 413 } 414 spin_unlock_irqrestore(&ci->lock, flags); 415 416 if (!ret) 417 ci_otg_queue_work(ci); 418 419 return HRTIMER_NORESTART; 420 } 421 422 /* Initialize timers */ 423 static int ci_otg_init_timers(struct ci_hdrc *ci) 424 { 425 hrtimer_init(&ci->otg_fsm_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); 426 ci->otg_fsm_hrtimer.function = ci_otg_hrtimer_func; 427 428 return 0; 429 } 430 431 /* -------------------------------------------------------------*/ 432 /* Operations that will be called from OTG Finite State Machine */ 433 /* -------------------------------------------------------------*/ 434 static void ci_otg_fsm_add_timer(struct otg_fsm *fsm, enum otg_fsm_timer t) 435 { 436 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm); 437 438 if (t < NUM_OTG_FSM_TIMERS) 439 ci_otg_add_timer(ci, t); 440 return; 441 } 442 443 static void ci_otg_fsm_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer t) 444 { 445 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm); 446 447 if (t < NUM_OTG_FSM_TIMERS) 448 ci_otg_del_timer(ci, t); 449 return; 450 } 451 452 /* 453 * A-device drive vbus: turn on vbus regulator and enable port power 454 * Data pulse irq should be disabled while vbus is on. 455 */ 456 static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on) 457 { 458 int ret; 459 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm); 460 461 if (on) { 462 /* Enable power */ 463 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP, 464 PORTSC_PP); 465 if (ci->platdata->reg_vbus) { 466 ret = regulator_enable(ci->platdata->reg_vbus); 467 if (ret) { 468 dev_err(ci->dev, 469 "Failed to enable vbus regulator, ret=%d\n", 470 ret); 471 return; 472 } 473 } 474 475 if (ci->platdata->flags & CI_HDRC_PHY_VBUS_CONTROL) 476 usb_phy_vbus_on(ci->usb_phy); 477 478 /* Disable data pulse irq */ 479 hw_write_otgsc(ci, OTGSC_DPIE, 0); 480 481 fsm->a_srp_det = 0; 482 fsm->power_up = 0; 483 } else { 484 if (ci->platdata->reg_vbus) 485 regulator_disable(ci->platdata->reg_vbus); 486 487 if (ci->platdata->flags & CI_HDRC_PHY_VBUS_CONTROL) 488 usb_phy_vbus_off(ci->usb_phy); 489 490 fsm->a_bus_drop = 1; 491 fsm->a_bus_req = 0; 492 } 493 } 494 495 /* 496 * Control data line by Run Stop bit. 497 */ 498 static void ci_otg_loc_conn(struct otg_fsm *fsm, int on) 499 { 500 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm); 501 502 if (on) 503 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS); 504 else 505 hw_write(ci, OP_USBCMD, USBCMD_RS, 0); 506 } 507 508 /* 509 * Generate SOF by host. 510 * In host mode, controller will automatically send SOF. 511 * Suspend will block the data on the port. 512 * 513 * This is controlled through usbcore by usb autosuspend, 514 * so the usb device class driver need support autosuspend, 515 * otherwise the bus suspend will not happen. 516 */ 517 static void ci_otg_loc_sof(struct otg_fsm *fsm, int on) 518 { 519 struct usb_device *udev; 520 521 if (!fsm->otg->host) 522 return; 523 524 udev = usb_hub_find_child(fsm->otg->host->root_hub, 1); 525 if (!udev) 526 return; 527 528 if (on) { 529 usb_disable_autosuspend(udev); 530 } else { 531 pm_runtime_set_autosuspend_delay(&udev->dev, 0); 532 usb_enable_autosuspend(udev); 533 } 534 } 535 536 /* 537 * Start SRP pulsing by data-line pulsing, 538 * no v-bus pulsing followed 539 */ 540 static void ci_otg_start_pulse(struct otg_fsm *fsm) 541 { 542 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm); 543 544 /* Hardware Assistant Data pulse */ 545 hw_write_otgsc(ci, OTGSC_HADP, OTGSC_HADP); 546 547 pm_runtime_get(ci->dev); 548 ci_otg_add_timer(ci, B_DATA_PLS); 549 } 550 551 static int ci_otg_start_host(struct otg_fsm *fsm, int on) 552 { 553 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm); 554 555 if (on) { 556 ci_role_stop(ci); 557 ci_role_start(ci, CI_ROLE_HOST); 558 } else { 559 ci_role_stop(ci); 560 ci_role_start(ci, CI_ROLE_GADGET); 561 } 562 return 0; 563 } 564 565 static int ci_otg_start_gadget(struct otg_fsm *fsm, int on) 566 { 567 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm); 568 569 if (on) 570 usb_gadget_vbus_connect(&ci->gadget); 571 else 572 usb_gadget_vbus_disconnect(&ci->gadget); 573 574 return 0; 575 } 576 577 static struct otg_fsm_ops ci_otg_ops = { 578 .drv_vbus = ci_otg_drv_vbus, 579 .loc_conn = ci_otg_loc_conn, 580 .loc_sof = ci_otg_loc_sof, 581 .start_pulse = ci_otg_start_pulse, 582 .add_timer = ci_otg_fsm_add_timer, 583 .del_timer = ci_otg_fsm_del_timer, 584 .start_host = ci_otg_start_host, 585 .start_gadget = ci_otg_start_gadget, 586 }; 587 588 int ci_otg_fsm_work(struct ci_hdrc *ci) 589 { 590 /* 591 * Don't do fsm transition for B device 592 * when there is no gadget class driver 593 */ 594 if (ci->fsm.id && !(ci->driver) && 595 ci->fsm.otg->state < OTG_STATE_A_IDLE) 596 return 0; 597 598 pm_runtime_get_sync(ci->dev); 599 if (otg_statemachine(&ci->fsm)) { 600 if (ci->fsm.otg->state == OTG_STATE_A_IDLE) { 601 /* 602 * Further state change for cases: 603 * a_idle to b_idle; or 604 * a_idle to a_wait_vrise due to ID change(1->0), so 605 * B-dev becomes A-dev can try to start new session 606 * consequently; or 607 * a_idle to a_wait_vrise when power up 608 */ 609 if ((ci->fsm.id) || (ci->id_event) || 610 (ci->fsm.power_up)) { 611 ci_otg_queue_work(ci); 612 } else { 613 /* Enable data pulse irq */ 614 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | 615 PORTSC_PP, 0); 616 hw_write_otgsc(ci, OTGSC_DPIS, OTGSC_DPIS); 617 hw_write_otgsc(ci, OTGSC_DPIE, OTGSC_DPIE); 618 } 619 if (ci->id_event) 620 ci->id_event = false; 621 } else if (ci->fsm.otg->state == OTG_STATE_B_IDLE) { 622 if (ci->fsm.b_sess_vld) { 623 ci->fsm.power_up = 0; 624 /* 625 * Further transite to b_periphearl state 626 * when register gadget driver with vbus on 627 */ 628 ci_otg_queue_work(ci); 629 } 630 } else if (ci->fsm.otg->state == OTG_STATE_A_HOST) { 631 pm_runtime_mark_last_busy(ci->dev); 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 */ 644 static 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 */ 739 irqreturn_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 } 790 791 void ci_hdrc_otg_fsm_start(struct ci_hdrc *ci) 792 { 793 ci_otg_queue_work(ci); 794 } 795 796 int 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 } 847 848 void ci_hdrc_otg_fsm_remove(struct ci_hdrc *ci) 849 { 850 sysfs_remove_group(&ci->dev->kobj, &inputs_attr_group); 851 } 852