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 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 */ 286 static int a_wait_vrise_tmout(struct ci_hdrc *ci) 287 { 288 ci->fsm.a_wait_vrise_tmout = 1; 289 return 0; 290 } 291 292 static int a_wait_vfall_tmout(struct ci_hdrc *ci) 293 { 294 ci->fsm.a_wait_vfall_tmout = 1; 295 return 0; 296 } 297 298 static int a_wait_bcon_tmout(struct ci_hdrc *ci) 299 { 300 ci->fsm.a_wait_bcon_tmout = 1; 301 return 0; 302 } 303 304 static int a_aidl_bdis_tmout(struct ci_hdrc *ci) 305 { 306 ci->fsm.a_aidl_bdis_tmout = 1; 307 return 0; 308 } 309 310 static int b_ase0_brst_tmout(struct ci_hdrc *ci) 311 { 312 ci->fsm.b_ase0_brst_tmout = 1; 313 return 0; 314 } 315 316 static int a_bidl_adis_tmout(struct ci_hdrc *ci) 317 { 318 ci->fsm.a_bidl_adis_tmout = 1; 319 return 0; 320 } 321 322 static int b_aidl_bdis_tmout(struct ci_hdrc *ci) 323 { 324 ci->fsm.a_bus_suspend = 1; 325 return 0; 326 } 327 328 static int b_se0_srp_tmout(struct ci_hdrc *ci) 329 { 330 ci->fsm.b_se0_srp = 1; 331 return 0; 332 } 333 334 static int b_srp_fail_tmout(struct ci_hdrc *ci) 335 { 336 ci->fsm.b_srp_done = 1; 337 return 1; 338 } 339 340 static 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 } 350 351 static 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 */ 365 static 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 */ 383 static 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 */ 425 static 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 /* -------------------------------------------------------------*/ 435 static 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 } 443 444 static 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 */ 457 static 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 */ 499 static 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 */ 518 static 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 */ 541 static 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 } 551 552 static 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 } 565 566 static 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 } 577 578 static 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 }; 588 589 int 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_mark_last_busy(ci->dev); 633 pm_runtime_put_autosuspend(ci->dev); 634 return 0; 635 } 636 } 637 pm_runtime_put_sync(ci->dev); 638 return 0; 639 } 640 641 /* 642 * Update fsm variables in each state if catching expected interrupts, 643 * called by otg fsm isr. 644 */ 645 static void ci_otg_fsm_event(struct ci_hdrc *ci) 646 { 647 u32 intr_sts, otg_bsess_vld, port_conn; 648 struct otg_fsm *fsm = &ci->fsm; 649 650 intr_sts = hw_read_intr_status(ci); 651 otg_bsess_vld = hw_read_otgsc(ci, OTGSC_BSV); 652 port_conn = hw_read(ci, OP_PORTSC, PORTSC_CCS); 653 654 switch (ci->fsm.otg->state) { 655 case OTG_STATE_A_WAIT_BCON: 656 if (port_conn) { 657 fsm->b_conn = 1; 658 fsm->a_bus_req = 1; 659 ci_otg_queue_work(ci); 660 } 661 break; 662 case OTG_STATE_B_IDLE: 663 if (otg_bsess_vld && (intr_sts & USBi_PCI) && port_conn) { 664 fsm->b_sess_vld = 1; 665 ci_otg_queue_work(ci); 666 } 667 break; 668 case OTG_STATE_B_PERIPHERAL: 669 if ((intr_sts & USBi_SLI) && port_conn && otg_bsess_vld) { 670 ci_otg_add_timer(ci, B_AIDL_BDIS); 671 } else if (intr_sts & USBi_PCI) { 672 ci_otg_del_timer(ci, B_AIDL_BDIS); 673 if (fsm->a_bus_suspend == 1) 674 fsm->a_bus_suspend = 0; 675 } 676 break; 677 case OTG_STATE_B_HOST: 678 if ((intr_sts & USBi_PCI) && !port_conn) { 679 fsm->a_conn = 0; 680 fsm->b_bus_req = 0; 681 ci_otg_queue_work(ci); 682 } 683 break; 684 case OTG_STATE_A_PERIPHERAL: 685 if (intr_sts & USBi_SLI) { 686 fsm->b_bus_suspend = 1; 687 /* 688 * Init a timer to know how long this suspend 689 * will continue, if time out, indicates B no longer 690 * wants to be host role 691 */ 692 ci_otg_add_timer(ci, A_BIDL_ADIS); 693 } 694 695 if (intr_sts & USBi_URI) 696 ci_otg_del_timer(ci, A_BIDL_ADIS); 697 698 if (intr_sts & USBi_PCI) { 699 if (fsm->b_bus_suspend == 1) { 700 ci_otg_del_timer(ci, A_BIDL_ADIS); 701 fsm->b_bus_suspend = 0; 702 } 703 } 704 break; 705 case OTG_STATE_A_SUSPEND: 706 if ((intr_sts & USBi_PCI) && !port_conn) { 707 fsm->b_conn = 0; 708 709 /* if gadget driver is binded */ 710 if (ci->driver) { 711 /* A device to be peripheral mode */ 712 ci->gadget.is_a_peripheral = 1; 713 } 714 ci_otg_queue_work(ci); 715 } 716 break; 717 case OTG_STATE_A_HOST: 718 if ((intr_sts & USBi_PCI) && !port_conn) { 719 fsm->b_conn = 0; 720 ci_otg_queue_work(ci); 721 } 722 break; 723 case OTG_STATE_B_WAIT_ACON: 724 if ((intr_sts & USBi_PCI) && port_conn) { 725 fsm->a_conn = 1; 726 ci_otg_queue_work(ci); 727 } 728 break; 729 default: 730 break; 731 } 732 } 733 734 /* 735 * ci_otg_irq - otg fsm related irq handling 736 * and also update otg fsm variable by monitoring usb host and udc 737 * state change interrupts. 738 * @ci: ci_hdrc 739 */ 740 irqreturn_t ci_otg_fsm_irq(struct ci_hdrc *ci) 741 { 742 irqreturn_t retval = IRQ_NONE; 743 u32 otgsc, otg_int_src = 0; 744 struct otg_fsm *fsm = &ci->fsm; 745 746 otgsc = hw_read_otgsc(ci, ~0); 747 otg_int_src = otgsc & OTGSC_INT_STATUS_BITS & (otgsc >> 8); 748 fsm->id = (otgsc & OTGSC_ID) ? 1 : 0; 749 750 if (otg_int_src) { 751 if (otg_int_src & OTGSC_DPIS) { 752 hw_write_otgsc(ci, OTGSC_DPIS, OTGSC_DPIS); 753 fsm->a_srp_det = 1; 754 fsm->a_bus_drop = 0; 755 } else if (otg_int_src & OTGSC_IDIS) { 756 hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS); 757 if (fsm->id == 0) { 758 fsm->a_bus_drop = 0; 759 fsm->a_bus_req = 1; 760 ci->id_event = true; 761 } 762 } else if (otg_int_src & OTGSC_BSVIS) { 763 hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS); 764 if (otgsc & OTGSC_BSV) { 765 fsm->b_sess_vld = 1; 766 ci_otg_del_timer(ci, B_SSEND_SRP); 767 ci_otg_del_timer(ci, B_SRP_FAIL); 768 fsm->b_ssend_srp = 0; 769 } else { 770 fsm->b_sess_vld = 0; 771 if (fsm->id) 772 ci_otg_add_timer(ci, B_SSEND_SRP); 773 } 774 } else if (otg_int_src & OTGSC_AVVIS) { 775 hw_write_otgsc(ci, OTGSC_AVVIS, OTGSC_AVVIS); 776 if (otgsc & OTGSC_AVV) { 777 fsm->a_vbus_vld = 1; 778 } else { 779 fsm->a_vbus_vld = 0; 780 fsm->b_conn = 0; 781 } 782 } 783 ci_otg_queue_work(ci); 784 return IRQ_HANDLED; 785 } 786 787 ci_otg_fsm_event(ci); 788 789 return retval; 790 } 791 792 void ci_hdrc_otg_fsm_start(struct ci_hdrc *ci) 793 { 794 ci_otg_queue_work(ci); 795 } 796 797 int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci) 798 { 799 int retval = 0; 800 801 if (ci->phy) 802 ci->otg.phy = ci->phy; 803 else 804 ci->otg.usb_phy = ci->usb_phy; 805 806 ci->otg.gadget = &ci->gadget; 807 ci->fsm.otg = &ci->otg; 808 ci->fsm.power_up = 1; 809 ci->fsm.id = hw_read_otgsc(ci, OTGSC_ID) ? 1 : 0; 810 ci->fsm.otg->state = OTG_STATE_UNDEFINED; 811 ci->fsm.ops = &ci_otg_ops; 812 ci->gadget.hnp_polling_support = 1; 813 ci->fsm.host_req_flag = devm_kzalloc(ci->dev, 1, GFP_KERNEL); 814 if (!ci->fsm.host_req_flag) 815 return -ENOMEM; 816 817 mutex_init(&ci->fsm.lock); 818 819 retval = ci_otg_init_timers(ci); 820 if (retval) { 821 dev_err(ci->dev, "Couldn't init OTG timers\n"); 822 return retval; 823 } 824 ci->enabled_otg_timer_bits = 0; 825 ci->next_otg_timer = NUM_OTG_FSM_TIMERS; 826 827 retval = sysfs_create_group(&ci->dev->kobj, &inputs_attr_group); 828 if (retval < 0) { 829 dev_dbg(ci->dev, 830 "Can't register sysfs attr group: %d\n", retval); 831 return retval; 832 } 833 834 /* Enable A vbus valid irq */ 835 hw_write_otgsc(ci, OTGSC_AVVIE, OTGSC_AVVIE); 836 837 if (ci->fsm.id) { 838 ci->fsm.b_ssend_srp = 839 hw_read_otgsc(ci, OTGSC_BSV) ? 0 : 1; 840 ci->fsm.b_sess_vld = 841 hw_read_otgsc(ci, OTGSC_BSV) ? 1 : 0; 842 /* Enable BSV irq */ 843 hw_write_otgsc(ci, OTGSC_BSVIE, OTGSC_BSVIE); 844 } 845 846 return 0; 847 } 848 849 void ci_hdrc_otg_fsm_remove(struct ci_hdrc *ci) 850 { 851 sysfs_remove_group(&ci->dev->kobj, &inputs_attr_group); 852 } 853