1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) 2 /* 3 * core.c - DesignWare HS OTG Controller common routines 4 * 5 * Copyright (C) 2004-2013 Synopsys, Inc. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions, and the following disclaimer, 12 * without modification. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The names of the above-listed copyright holders may not be used 17 * to endorse or promote products derived from this software without 18 * specific prior written permission. 19 * 20 * ALTERNATIVELY, this software may be distributed under the terms of the 21 * GNU General Public License ("GPL") as published by the Free Software 22 * Foundation; either version 2 of the License, or (at your option) any 23 * later version. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 26 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 27 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 29 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 30 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 31 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 32 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * The Core code provides basic services for accessing and managing the 40 * DWC_otg hardware. These services are used by both the Host Controller 41 * Driver and the Peripheral Controller Driver. 42 */ 43 #include <linux/kernel.h> 44 #include <linux/module.h> 45 #include <linux/moduleparam.h> 46 #include <linux/spinlock.h> 47 #include <linux/interrupt.h> 48 #include <linux/dma-mapping.h> 49 #include <linux/delay.h> 50 #include <linux/io.h> 51 #include <linux/slab.h> 52 #include <linux/usb.h> 53 54 #include <linux/usb/hcd.h> 55 #include <linux/usb/ch11.h> 56 57 #include "core.h" 58 #include "hcd.h" 59 60 /** 61 * dwc2_backup_global_registers() - Backup global controller registers. 62 * When suspending usb bus, registers needs to be backuped 63 * if controller power is disabled once suspended. 64 * 65 * @hsotg: Programming view of the DWC_otg controller 66 */ 67 int dwc2_backup_global_registers(struct dwc2_hsotg *hsotg) 68 { 69 struct dwc2_gregs_backup *gr; 70 71 dev_dbg(hsotg->dev, "%s\n", __func__); 72 73 /* Backup global regs */ 74 gr = &hsotg->gr_backup; 75 76 gr->gotgctl = dwc2_readl(hsotg, GOTGCTL); 77 gr->gintmsk = dwc2_readl(hsotg, GINTMSK); 78 gr->gahbcfg = dwc2_readl(hsotg, GAHBCFG); 79 gr->gusbcfg = dwc2_readl(hsotg, GUSBCFG); 80 gr->grxfsiz = dwc2_readl(hsotg, GRXFSIZ); 81 gr->gnptxfsiz = dwc2_readl(hsotg, GNPTXFSIZ); 82 gr->gdfifocfg = dwc2_readl(hsotg, GDFIFOCFG); 83 gr->pcgcctl1 = dwc2_readl(hsotg, PCGCCTL1); 84 gr->glpmcfg = dwc2_readl(hsotg, GLPMCFG); 85 gr->gi2cctl = dwc2_readl(hsotg, GI2CCTL); 86 gr->pcgcctl = dwc2_readl(hsotg, PCGCTL); 87 88 gr->valid = true; 89 return 0; 90 } 91 92 /** 93 * dwc2_restore_global_registers() - Restore controller global registers. 94 * When resuming usb bus, device registers needs to be restored 95 * if controller power were disabled. 96 * 97 * @hsotg: Programming view of the DWC_otg controller 98 */ 99 int dwc2_restore_global_registers(struct dwc2_hsotg *hsotg) 100 { 101 struct dwc2_gregs_backup *gr; 102 103 dev_dbg(hsotg->dev, "%s\n", __func__); 104 105 /* Restore global regs */ 106 gr = &hsotg->gr_backup; 107 if (!gr->valid) { 108 dev_err(hsotg->dev, "%s: no global registers to restore\n", 109 __func__); 110 return -EINVAL; 111 } 112 gr->valid = false; 113 114 dwc2_writel(hsotg, 0xffffffff, GINTSTS); 115 dwc2_writel(hsotg, gr->gotgctl, GOTGCTL); 116 dwc2_writel(hsotg, gr->gintmsk, GINTMSK); 117 dwc2_writel(hsotg, gr->gusbcfg, GUSBCFG); 118 dwc2_writel(hsotg, gr->gahbcfg, GAHBCFG); 119 dwc2_writel(hsotg, gr->grxfsiz, GRXFSIZ); 120 dwc2_writel(hsotg, gr->gnptxfsiz, GNPTXFSIZ); 121 dwc2_writel(hsotg, gr->gdfifocfg, GDFIFOCFG); 122 dwc2_writel(hsotg, gr->pcgcctl1, PCGCCTL1); 123 dwc2_writel(hsotg, gr->glpmcfg, GLPMCFG); 124 dwc2_writel(hsotg, gr->pcgcctl, PCGCTL); 125 dwc2_writel(hsotg, gr->gi2cctl, GI2CCTL); 126 127 return 0; 128 } 129 130 /** 131 * dwc2_exit_partial_power_down() - Exit controller from Partial Power Down. 132 * 133 * @hsotg: Programming view of the DWC_otg controller 134 * @rem_wakeup: indicates whether resume is initiated by Reset. 135 * @restore: Controller registers need to be restored 136 */ 137 int dwc2_exit_partial_power_down(struct dwc2_hsotg *hsotg, int rem_wakeup, 138 bool restore) 139 { 140 struct dwc2_gregs_backup *gr; 141 142 gr = &hsotg->gr_backup; 143 144 /* 145 * Restore host or device regisers with the same mode core enterted 146 * to partial power down by checking "GOTGCTL_CURMODE_HOST" backup 147 * value of the "gotgctl" register. 148 */ 149 if (gr->gotgctl & GOTGCTL_CURMODE_HOST) 150 return dwc2_host_exit_partial_power_down(hsotg, rem_wakeup, 151 restore); 152 else 153 return dwc2_gadget_exit_partial_power_down(hsotg, restore); 154 } 155 156 /** 157 * dwc2_enter_partial_power_down() - Put controller in Partial Power Down. 158 * 159 * @hsotg: Programming view of the DWC_otg controller 160 */ 161 int dwc2_enter_partial_power_down(struct dwc2_hsotg *hsotg) 162 { 163 if (dwc2_is_host_mode(hsotg)) 164 return dwc2_host_enter_partial_power_down(hsotg); 165 else 166 return dwc2_gadget_enter_partial_power_down(hsotg); 167 } 168 169 /** 170 * dwc2_restore_essential_regs() - Restore essiential regs of core. 171 * 172 * @hsotg: Programming view of the DWC_otg controller 173 * @rmode: Restore mode, enabled in case of remote-wakeup. 174 * @is_host: Host or device mode. 175 */ 176 static void dwc2_restore_essential_regs(struct dwc2_hsotg *hsotg, int rmode, 177 int is_host) 178 { 179 u32 pcgcctl; 180 struct dwc2_gregs_backup *gr; 181 struct dwc2_dregs_backup *dr; 182 struct dwc2_hregs_backup *hr; 183 184 gr = &hsotg->gr_backup; 185 dr = &hsotg->dr_backup; 186 hr = &hsotg->hr_backup; 187 188 dev_dbg(hsotg->dev, "%s: restoring essential regs\n", __func__); 189 190 /* Load restore values for [31:14] bits */ 191 pcgcctl = (gr->pcgcctl & 0xffffc000); 192 /* If High Speed */ 193 if (is_host) { 194 if (!(pcgcctl & PCGCTL_P2HD_PRT_SPD_MASK)) 195 pcgcctl |= BIT(17); 196 } else { 197 if (!(pcgcctl & PCGCTL_P2HD_DEV_ENUM_SPD_MASK)) 198 pcgcctl |= BIT(17); 199 } 200 dwc2_writel(hsotg, pcgcctl, PCGCTL); 201 202 /* Umnask global Interrupt in GAHBCFG and restore it */ 203 dwc2_writel(hsotg, gr->gahbcfg | GAHBCFG_GLBL_INTR_EN, GAHBCFG); 204 205 /* Clear all pending interupts */ 206 dwc2_writel(hsotg, 0xffffffff, GINTSTS); 207 208 /* Unmask restore done interrupt */ 209 dwc2_writel(hsotg, GINTSTS_RESTOREDONE, GINTMSK); 210 211 /* Restore GUSBCFG and HCFG/DCFG */ 212 dwc2_writel(hsotg, gr->gusbcfg, GUSBCFG); 213 214 if (is_host) { 215 dwc2_writel(hsotg, hr->hcfg, HCFG); 216 if (rmode) 217 pcgcctl |= PCGCTL_RESTOREMODE; 218 dwc2_writel(hsotg, pcgcctl, PCGCTL); 219 udelay(10); 220 221 pcgcctl |= PCGCTL_ESS_REG_RESTORED; 222 dwc2_writel(hsotg, pcgcctl, PCGCTL); 223 udelay(10); 224 } else { 225 dwc2_writel(hsotg, dr->dcfg, DCFG); 226 if (!rmode) 227 pcgcctl |= PCGCTL_RESTOREMODE | PCGCTL_RSTPDWNMODULE; 228 dwc2_writel(hsotg, pcgcctl, PCGCTL); 229 udelay(10); 230 231 pcgcctl |= PCGCTL_ESS_REG_RESTORED; 232 dwc2_writel(hsotg, pcgcctl, PCGCTL); 233 udelay(10); 234 } 235 } 236 237 /** 238 * dwc2_hib_restore_common() - Common part of restore routine. 239 * 240 * @hsotg: Programming view of the DWC_otg controller 241 * @rem_wakeup: Remote-wakeup, enabled in case of remote-wakeup. 242 * @is_host: Host or device mode. 243 */ 244 void dwc2_hib_restore_common(struct dwc2_hsotg *hsotg, int rem_wakeup, 245 int is_host) 246 { 247 u32 gpwrdn; 248 249 /* Switch-on voltage to the core */ 250 gpwrdn = dwc2_readl(hsotg, GPWRDN); 251 gpwrdn &= ~GPWRDN_PWRDNSWTCH; 252 dwc2_writel(hsotg, gpwrdn, GPWRDN); 253 udelay(10); 254 255 /* Reset core */ 256 gpwrdn = dwc2_readl(hsotg, GPWRDN); 257 gpwrdn &= ~GPWRDN_PWRDNRSTN; 258 dwc2_writel(hsotg, gpwrdn, GPWRDN); 259 udelay(10); 260 261 /* Enable restore from PMU */ 262 gpwrdn = dwc2_readl(hsotg, GPWRDN); 263 gpwrdn |= GPWRDN_RESTORE; 264 dwc2_writel(hsotg, gpwrdn, GPWRDN); 265 udelay(10); 266 267 /* Disable Power Down Clamp */ 268 gpwrdn = dwc2_readl(hsotg, GPWRDN); 269 gpwrdn &= ~GPWRDN_PWRDNCLMP; 270 dwc2_writel(hsotg, gpwrdn, GPWRDN); 271 udelay(50); 272 273 if (!is_host && rem_wakeup) 274 udelay(70); 275 276 /* Deassert reset core */ 277 gpwrdn = dwc2_readl(hsotg, GPWRDN); 278 gpwrdn |= GPWRDN_PWRDNRSTN; 279 dwc2_writel(hsotg, gpwrdn, GPWRDN); 280 udelay(10); 281 282 /* Disable PMU interrupt */ 283 gpwrdn = dwc2_readl(hsotg, GPWRDN); 284 gpwrdn &= ~GPWRDN_PMUINTSEL; 285 dwc2_writel(hsotg, gpwrdn, GPWRDN); 286 udelay(10); 287 288 /* Set Restore Essential Regs bit in PCGCCTL register */ 289 dwc2_restore_essential_regs(hsotg, rem_wakeup, is_host); 290 291 /* 292 * Wait For Restore_done Interrupt. This mechanism of polling the 293 * interrupt is introduced to avoid any possible race conditions 294 */ 295 if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS, GINTSTS_RESTOREDONE, 296 20000)) { 297 dev_dbg(hsotg->dev, 298 "%s: Restore Done wasn't generated here\n", 299 __func__); 300 } else { 301 dev_dbg(hsotg->dev, "restore done generated here\n"); 302 303 /* 304 * To avoid restore done interrupt storm after restore is 305 * generated clear GINTSTS_RESTOREDONE bit. 306 */ 307 dwc2_writel(hsotg, GINTSTS_RESTOREDONE, GINTSTS); 308 } 309 } 310 311 /** 312 * dwc2_wait_for_mode() - Waits for the controller mode. 313 * @hsotg: Programming view of the DWC_otg controller. 314 * @host_mode: If true, waits for host mode, otherwise device mode. 315 */ 316 static void dwc2_wait_for_mode(struct dwc2_hsotg *hsotg, 317 bool host_mode) 318 { 319 ktime_t start; 320 ktime_t end; 321 unsigned int timeout = 110; 322 323 dev_vdbg(hsotg->dev, "Waiting for %s mode\n", 324 host_mode ? "host" : "device"); 325 326 start = ktime_get(); 327 328 while (1) { 329 s64 ms; 330 331 if (dwc2_is_host_mode(hsotg) == host_mode) { 332 dev_vdbg(hsotg->dev, "%s mode set\n", 333 host_mode ? "Host" : "Device"); 334 break; 335 } 336 337 end = ktime_get(); 338 ms = ktime_to_ms(ktime_sub(end, start)); 339 340 if (ms >= (s64)timeout) { 341 dev_warn(hsotg->dev, "%s: Couldn't set %s mode\n", 342 __func__, host_mode ? "host" : "device"); 343 break; 344 } 345 346 usleep_range(1000, 2000); 347 } 348 } 349 350 /** 351 * dwc2_iddig_filter_enabled() - Returns true if the IDDIG debounce 352 * filter is enabled. 353 * 354 * @hsotg: Programming view of DWC_otg controller 355 */ 356 static bool dwc2_iddig_filter_enabled(struct dwc2_hsotg *hsotg) 357 { 358 u32 gsnpsid; 359 u32 ghwcfg4; 360 361 if (!dwc2_hw_is_otg(hsotg)) 362 return false; 363 364 /* Check if core configuration includes the IDDIG filter. */ 365 ghwcfg4 = dwc2_readl(hsotg, GHWCFG4); 366 if (!(ghwcfg4 & GHWCFG4_IDDIG_FILT_EN)) 367 return false; 368 369 /* 370 * Check if the IDDIG debounce filter is bypassed. Available 371 * in core version >= 3.10a. 372 */ 373 gsnpsid = dwc2_readl(hsotg, GSNPSID); 374 if (gsnpsid >= DWC2_CORE_REV_3_10a) { 375 u32 gotgctl = dwc2_readl(hsotg, GOTGCTL); 376 377 if (gotgctl & GOTGCTL_DBNCE_FLTR_BYPASS) 378 return false; 379 } 380 381 return true; 382 } 383 384 /* 385 * dwc2_enter_hibernation() - Common function to enter hibernation. 386 * 387 * @hsotg: Programming view of the DWC_otg controller 388 * @is_host: True if core is in host mode. 389 * 390 * Return: 0 if successful, negative error code otherwise 391 */ 392 int dwc2_enter_hibernation(struct dwc2_hsotg *hsotg, int is_host) 393 { 394 if (is_host) 395 return dwc2_host_enter_hibernation(hsotg); 396 else 397 return dwc2_gadget_enter_hibernation(hsotg); 398 } 399 400 /* 401 * dwc2_exit_hibernation() - Common function to exit from hibernation. 402 * 403 * @hsotg: Programming view of the DWC_otg controller 404 * @rem_wakeup: Remote-wakeup, enabled in case of remote-wakeup. 405 * @reset: Enabled in case of restore with reset. 406 * @is_host: True if core is in host mode. 407 * 408 * Return: 0 if successful, negative error code otherwise 409 */ 410 int dwc2_exit_hibernation(struct dwc2_hsotg *hsotg, int rem_wakeup, 411 int reset, int is_host) 412 { 413 if (is_host) 414 return dwc2_host_exit_hibernation(hsotg, rem_wakeup, reset); 415 else 416 return dwc2_gadget_exit_hibernation(hsotg, rem_wakeup, reset); 417 } 418 419 /* 420 * Do core a soft reset of the core. Be careful with this because it 421 * resets all the internal state machines of the core. 422 */ 423 int dwc2_core_reset(struct dwc2_hsotg *hsotg, bool skip_wait) 424 { 425 u32 greset; 426 bool wait_for_host_mode = false; 427 428 dev_vdbg(hsotg->dev, "%s()\n", __func__); 429 430 /* 431 * If the current mode is host, either due to the force mode 432 * bit being set (which persists after core reset) or the 433 * connector id pin, a core soft reset will temporarily reset 434 * the mode to device. A delay from the IDDIG debounce filter 435 * will occur before going back to host mode. 436 * 437 * Determine whether we will go back into host mode after a 438 * reset and account for this delay after the reset. 439 */ 440 if (dwc2_iddig_filter_enabled(hsotg)) { 441 u32 gotgctl = dwc2_readl(hsotg, GOTGCTL); 442 u32 gusbcfg = dwc2_readl(hsotg, GUSBCFG); 443 444 if (!(gotgctl & GOTGCTL_CONID_B) || 445 (gusbcfg & GUSBCFG_FORCEHOSTMODE)) { 446 wait_for_host_mode = true; 447 } 448 } 449 450 /* Core Soft Reset */ 451 greset = dwc2_readl(hsotg, GRSTCTL); 452 greset |= GRSTCTL_CSFTRST; 453 dwc2_writel(hsotg, greset, GRSTCTL); 454 455 if ((hsotg->hw_params.snpsid & DWC2_CORE_REV_MASK) < 456 (DWC2_CORE_REV_4_20a & DWC2_CORE_REV_MASK)) { 457 if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, 458 GRSTCTL_CSFTRST, 10000)) { 459 dev_warn(hsotg->dev, "%s: HANG! Soft Reset timeout GRSTCTL_CSFTRST\n", 460 __func__); 461 return -EBUSY; 462 } 463 } else { 464 if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, 465 GRSTCTL_CSFTRST_DONE, 10000)) { 466 dev_warn(hsotg->dev, "%s: HANG! Soft Reset timeout GRSTCTL_CSFTRST_DONE\n", 467 __func__); 468 return -EBUSY; 469 } 470 greset = dwc2_readl(hsotg, GRSTCTL); 471 greset &= ~GRSTCTL_CSFTRST; 472 greset |= GRSTCTL_CSFTRST_DONE; 473 dwc2_writel(hsotg, greset, GRSTCTL); 474 } 475 476 /* 477 * Switching from device mode to host mode by disconnecting 478 * device cable core enters and exits form hibernation. 479 * However, the fifo map remains not cleared. It results 480 * to a WARNING (WARNING: CPU: 5 PID: 0 at drivers/usb/dwc2/ 481 * gadget.c:307 dwc2_hsotg_init_fifo+0x12/0x152 [dwc2]) 482 * if in host mode we disconnect the micro a to b host 483 * cable. Because core reset occurs. 484 * To avoid the WARNING, fifo_map should be cleared 485 * in dwc2_core_reset() function by taking into account configs. 486 * fifo_map must be cleared only if driver is configured in 487 * "CONFIG_USB_DWC2_PERIPHERAL" or "CONFIG_USB_DWC2_DUAL_ROLE" 488 * mode. 489 */ 490 dwc2_clear_fifo_map(hsotg); 491 492 /* Wait for AHB master IDLE state */ 493 if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, GRSTCTL_AHBIDLE, 10000)) { 494 dev_warn(hsotg->dev, "%s: HANG! AHB Idle timeout GRSTCTL GRSTCTL_AHBIDLE\n", 495 __func__); 496 return -EBUSY; 497 } 498 499 if (wait_for_host_mode && !skip_wait) 500 dwc2_wait_for_mode(hsotg, true); 501 502 return 0; 503 } 504 505 /** 506 * dwc2_force_mode() - Force the mode of the controller. 507 * 508 * Forcing the mode is needed for two cases: 509 * 510 * 1) If the dr_mode is set to either HOST or PERIPHERAL we force the 511 * controller to stay in a particular mode regardless of ID pin 512 * changes. We do this once during probe. 513 * 514 * 2) During probe we want to read reset values of the hw 515 * configuration registers that are only available in either host or 516 * device mode. We may need to force the mode if the current mode does 517 * not allow us to access the register in the mode that we want. 518 * 519 * In either case it only makes sense to force the mode if the 520 * controller hardware is OTG capable. 521 * 522 * Checks are done in this function to determine whether doing a force 523 * would be valid or not. 524 * 525 * If a force is done, it requires a IDDIG debounce filter delay if 526 * the filter is configured and enabled. We poll the current mode of 527 * the controller to account for this delay. 528 * 529 * @hsotg: Programming view of DWC_otg controller 530 * @host: Host mode flag 531 */ 532 void dwc2_force_mode(struct dwc2_hsotg *hsotg, bool host) 533 { 534 u32 gusbcfg; 535 u32 set; 536 u32 clear; 537 538 dev_dbg(hsotg->dev, "Forcing mode to %s\n", host ? "host" : "device"); 539 540 /* 541 * Force mode has no effect if the hardware is not OTG. 542 */ 543 if (!dwc2_hw_is_otg(hsotg)) 544 return; 545 546 /* 547 * If dr_mode is either peripheral or host only, there is no 548 * need to ever force the mode to the opposite mode. 549 */ 550 if (WARN_ON(host && hsotg->dr_mode == USB_DR_MODE_PERIPHERAL)) 551 return; 552 553 if (WARN_ON(!host && hsotg->dr_mode == USB_DR_MODE_HOST)) 554 return; 555 556 gusbcfg = dwc2_readl(hsotg, GUSBCFG); 557 558 set = host ? GUSBCFG_FORCEHOSTMODE : GUSBCFG_FORCEDEVMODE; 559 clear = host ? GUSBCFG_FORCEDEVMODE : GUSBCFG_FORCEHOSTMODE; 560 561 gusbcfg &= ~clear; 562 gusbcfg |= set; 563 dwc2_writel(hsotg, gusbcfg, GUSBCFG); 564 565 dwc2_wait_for_mode(hsotg, host); 566 return; 567 } 568 569 /** 570 * dwc2_clear_force_mode() - Clears the force mode bits. 571 * 572 * After clearing the bits, wait up to 100 ms to account for any 573 * potential IDDIG filter delay. We can't know if we expect this delay 574 * or not because the value of the connector ID status is affected by 575 * the force mode. We only need to call this once during probe if 576 * dr_mode == OTG. 577 * 578 * @hsotg: Programming view of DWC_otg controller 579 */ 580 static void dwc2_clear_force_mode(struct dwc2_hsotg *hsotg) 581 { 582 u32 gusbcfg; 583 584 if (!dwc2_hw_is_otg(hsotg)) 585 return; 586 587 dev_dbg(hsotg->dev, "Clearing force mode bits\n"); 588 589 gusbcfg = dwc2_readl(hsotg, GUSBCFG); 590 gusbcfg &= ~GUSBCFG_FORCEHOSTMODE; 591 gusbcfg &= ~GUSBCFG_FORCEDEVMODE; 592 dwc2_writel(hsotg, gusbcfg, GUSBCFG); 593 594 if (dwc2_iddig_filter_enabled(hsotg)) 595 msleep(100); 596 } 597 598 /* 599 * Sets or clears force mode based on the dr_mode parameter. 600 */ 601 void dwc2_force_dr_mode(struct dwc2_hsotg *hsotg) 602 { 603 switch (hsotg->dr_mode) { 604 case USB_DR_MODE_HOST: 605 /* 606 * NOTE: This is required for some rockchip soc based 607 * platforms on their host-only dwc2. 608 */ 609 if (!dwc2_hw_is_otg(hsotg)) 610 msleep(50); 611 612 break; 613 case USB_DR_MODE_PERIPHERAL: 614 dwc2_force_mode(hsotg, false); 615 break; 616 case USB_DR_MODE_OTG: 617 dwc2_clear_force_mode(hsotg); 618 break; 619 default: 620 dev_warn(hsotg->dev, "%s() Invalid dr_mode=%d\n", 621 __func__, hsotg->dr_mode); 622 break; 623 } 624 } 625 626 /* 627 * dwc2_enable_acg - enable active clock gating feature 628 */ 629 void dwc2_enable_acg(struct dwc2_hsotg *hsotg) 630 { 631 if (hsotg->params.acg_enable) { 632 u32 pcgcctl1 = dwc2_readl(hsotg, PCGCCTL1); 633 634 dev_dbg(hsotg->dev, "Enabling Active Clock Gating\n"); 635 pcgcctl1 |= PCGCCTL1_GATEEN; 636 dwc2_writel(hsotg, pcgcctl1, PCGCCTL1); 637 } 638 } 639 640 /** 641 * dwc2_dump_host_registers() - Prints the host registers 642 * 643 * @hsotg: Programming view of DWC_otg controller 644 * 645 * NOTE: This function will be removed once the peripheral controller code 646 * is integrated and the driver is stable 647 */ 648 void dwc2_dump_host_registers(struct dwc2_hsotg *hsotg) 649 { 650 #ifdef DEBUG 651 u32 __iomem *addr; 652 int i; 653 654 dev_dbg(hsotg->dev, "Host Global Registers\n"); 655 addr = hsotg->regs + HCFG; 656 dev_dbg(hsotg->dev, "HCFG @0x%08lX : 0x%08X\n", 657 (unsigned long)addr, dwc2_readl(hsotg, HCFG)); 658 addr = hsotg->regs + HFIR; 659 dev_dbg(hsotg->dev, "HFIR @0x%08lX : 0x%08X\n", 660 (unsigned long)addr, dwc2_readl(hsotg, HFIR)); 661 addr = hsotg->regs + HFNUM; 662 dev_dbg(hsotg->dev, "HFNUM @0x%08lX : 0x%08X\n", 663 (unsigned long)addr, dwc2_readl(hsotg, HFNUM)); 664 addr = hsotg->regs + HPTXSTS; 665 dev_dbg(hsotg->dev, "HPTXSTS @0x%08lX : 0x%08X\n", 666 (unsigned long)addr, dwc2_readl(hsotg, HPTXSTS)); 667 addr = hsotg->regs + HAINT; 668 dev_dbg(hsotg->dev, "HAINT @0x%08lX : 0x%08X\n", 669 (unsigned long)addr, dwc2_readl(hsotg, HAINT)); 670 addr = hsotg->regs + HAINTMSK; 671 dev_dbg(hsotg->dev, "HAINTMSK @0x%08lX : 0x%08X\n", 672 (unsigned long)addr, dwc2_readl(hsotg, HAINTMSK)); 673 if (hsotg->params.dma_desc_enable) { 674 addr = hsotg->regs + HFLBADDR; 675 dev_dbg(hsotg->dev, "HFLBADDR @0x%08lX : 0x%08X\n", 676 (unsigned long)addr, dwc2_readl(hsotg, HFLBADDR)); 677 } 678 679 addr = hsotg->regs + HPRT0; 680 dev_dbg(hsotg->dev, "HPRT0 @0x%08lX : 0x%08X\n", 681 (unsigned long)addr, dwc2_readl(hsotg, HPRT0)); 682 683 for (i = 0; i < hsotg->params.host_channels; i++) { 684 dev_dbg(hsotg->dev, "Host Channel %d Specific Registers\n", i); 685 addr = hsotg->regs + HCCHAR(i); 686 dev_dbg(hsotg->dev, "HCCHAR @0x%08lX : 0x%08X\n", 687 (unsigned long)addr, dwc2_readl(hsotg, HCCHAR(i))); 688 addr = hsotg->regs + HCSPLT(i); 689 dev_dbg(hsotg->dev, "HCSPLT @0x%08lX : 0x%08X\n", 690 (unsigned long)addr, dwc2_readl(hsotg, HCSPLT(i))); 691 addr = hsotg->regs + HCINT(i); 692 dev_dbg(hsotg->dev, "HCINT @0x%08lX : 0x%08X\n", 693 (unsigned long)addr, dwc2_readl(hsotg, HCINT(i))); 694 addr = hsotg->regs + HCINTMSK(i); 695 dev_dbg(hsotg->dev, "HCINTMSK @0x%08lX : 0x%08X\n", 696 (unsigned long)addr, dwc2_readl(hsotg, HCINTMSK(i))); 697 addr = hsotg->regs + HCTSIZ(i); 698 dev_dbg(hsotg->dev, "HCTSIZ @0x%08lX : 0x%08X\n", 699 (unsigned long)addr, dwc2_readl(hsotg, HCTSIZ(i))); 700 addr = hsotg->regs + HCDMA(i); 701 dev_dbg(hsotg->dev, "HCDMA @0x%08lX : 0x%08X\n", 702 (unsigned long)addr, dwc2_readl(hsotg, HCDMA(i))); 703 if (hsotg->params.dma_desc_enable) { 704 addr = hsotg->regs + HCDMAB(i); 705 dev_dbg(hsotg->dev, "HCDMAB @0x%08lX : 0x%08X\n", 706 (unsigned long)addr, dwc2_readl(hsotg, 707 HCDMAB(i))); 708 } 709 } 710 #endif 711 } 712 713 /** 714 * dwc2_dump_global_registers() - Prints the core global registers 715 * 716 * @hsotg: Programming view of DWC_otg controller 717 * 718 * NOTE: This function will be removed once the peripheral controller code 719 * is integrated and the driver is stable 720 */ 721 void dwc2_dump_global_registers(struct dwc2_hsotg *hsotg) 722 { 723 #ifdef DEBUG 724 u32 __iomem *addr; 725 726 dev_dbg(hsotg->dev, "Core Global Registers\n"); 727 addr = hsotg->regs + GOTGCTL; 728 dev_dbg(hsotg->dev, "GOTGCTL @0x%08lX : 0x%08X\n", 729 (unsigned long)addr, dwc2_readl(hsotg, GOTGCTL)); 730 addr = hsotg->regs + GOTGINT; 731 dev_dbg(hsotg->dev, "GOTGINT @0x%08lX : 0x%08X\n", 732 (unsigned long)addr, dwc2_readl(hsotg, GOTGINT)); 733 addr = hsotg->regs + GAHBCFG; 734 dev_dbg(hsotg->dev, "GAHBCFG @0x%08lX : 0x%08X\n", 735 (unsigned long)addr, dwc2_readl(hsotg, GAHBCFG)); 736 addr = hsotg->regs + GUSBCFG; 737 dev_dbg(hsotg->dev, "GUSBCFG @0x%08lX : 0x%08X\n", 738 (unsigned long)addr, dwc2_readl(hsotg, GUSBCFG)); 739 addr = hsotg->regs + GRSTCTL; 740 dev_dbg(hsotg->dev, "GRSTCTL @0x%08lX : 0x%08X\n", 741 (unsigned long)addr, dwc2_readl(hsotg, GRSTCTL)); 742 addr = hsotg->regs + GINTSTS; 743 dev_dbg(hsotg->dev, "GINTSTS @0x%08lX : 0x%08X\n", 744 (unsigned long)addr, dwc2_readl(hsotg, GINTSTS)); 745 addr = hsotg->regs + GINTMSK; 746 dev_dbg(hsotg->dev, "GINTMSK @0x%08lX : 0x%08X\n", 747 (unsigned long)addr, dwc2_readl(hsotg, GINTMSK)); 748 addr = hsotg->regs + GRXSTSR; 749 dev_dbg(hsotg->dev, "GRXSTSR @0x%08lX : 0x%08X\n", 750 (unsigned long)addr, dwc2_readl(hsotg, GRXSTSR)); 751 addr = hsotg->regs + GRXFSIZ; 752 dev_dbg(hsotg->dev, "GRXFSIZ @0x%08lX : 0x%08X\n", 753 (unsigned long)addr, dwc2_readl(hsotg, GRXFSIZ)); 754 addr = hsotg->regs + GNPTXFSIZ; 755 dev_dbg(hsotg->dev, "GNPTXFSIZ @0x%08lX : 0x%08X\n", 756 (unsigned long)addr, dwc2_readl(hsotg, GNPTXFSIZ)); 757 addr = hsotg->regs + GNPTXSTS; 758 dev_dbg(hsotg->dev, "GNPTXSTS @0x%08lX : 0x%08X\n", 759 (unsigned long)addr, dwc2_readl(hsotg, GNPTXSTS)); 760 addr = hsotg->regs + GI2CCTL; 761 dev_dbg(hsotg->dev, "GI2CCTL @0x%08lX : 0x%08X\n", 762 (unsigned long)addr, dwc2_readl(hsotg, GI2CCTL)); 763 addr = hsotg->regs + GPVNDCTL; 764 dev_dbg(hsotg->dev, "GPVNDCTL @0x%08lX : 0x%08X\n", 765 (unsigned long)addr, dwc2_readl(hsotg, GPVNDCTL)); 766 addr = hsotg->regs + GGPIO; 767 dev_dbg(hsotg->dev, "GGPIO @0x%08lX : 0x%08X\n", 768 (unsigned long)addr, dwc2_readl(hsotg, GGPIO)); 769 addr = hsotg->regs + GUID; 770 dev_dbg(hsotg->dev, "GUID @0x%08lX : 0x%08X\n", 771 (unsigned long)addr, dwc2_readl(hsotg, GUID)); 772 addr = hsotg->regs + GSNPSID; 773 dev_dbg(hsotg->dev, "GSNPSID @0x%08lX : 0x%08X\n", 774 (unsigned long)addr, dwc2_readl(hsotg, GSNPSID)); 775 addr = hsotg->regs + GHWCFG1; 776 dev_dbg(hsotg->dev, "GHWCFG1 @0x%08lX : 0x%08X\n", 777 (unsigned long)addr, dwc2_readl(hsotg, GHWCFG1)); 778 addr = hsotg->regs + GHWCFG2; 779 dev_dbg(hsotg->dev, "GHWCFG2 @0x%08lX : 0x%08X\n", 780 (unsigned long)addr, dwc2_readl(hsotg, GHWCFG2)); 781 addr = hsotg->regs + GHWCFG3; 782 dev_dbg(hsotg->dev, "GHWCFG3 @0x%08lX : 0x%08X\n", 783 (unsigned long)addr, dwc2_readl(hsotg, GHWCFG3)); 784 addr = hsotg->regs + GHWCFG4; 785 dev_dbg(hsotg->dev, "GHWCFG4 @0x%08lX : 0x%08X\n", 786 (unsigned long)addr, dwc2_readl(hsotg, GHWCFG4)); 787 addr = hsotg->regs + GLPMCFG; 788 dev_dbg(hsotg->dev, "GLPMCFG @0x%08lX : 0x%08X\n", 789 (unsigned long)addr, dwc2_readl(hsotg, GLPMCFG)); 790 addr = hsotg->regs + GPWRDN; 791 dev_dbg(hsotg->dev, "GPWRDN @0x%08lX : 0x%08X\n", 792 (unsigned long)addr, dwc2_readl(hsotg, GPWRDN)); 793 addr = hsotg->regs + GDFIFOCFG; 794 dev_dbg(hsotg->dev, "GDFIFOCFG @0x%08lX : 0x%08X\n", 795 (unsigned long)addr, dwc2_readl(hsotg, GDFIFOCFG)); 796 addr = hsotg->regs + HPTXFSIZ; 797 dev_dbg(hsotg->dev, "HPTXFSIZ @0x%08lX : 0x%08X\n", 798 (unsigned long)addr, dwc2_readl(hsotg, HPTXFSIZ)); 799 800 addr = hsotg->regs + PCGCTL; 801 dev_dbg(hsotg->dev, "PCGCTL @0x%08lX : 0x%08X\n", 802 (unsigned long)addr, dwc2_readl(hsotg, PCGCTL)); 803 #endif 804 } 805 806 /** 807 * dwc2_flush_tx_fifo() - Flushes a Tx FIFO 808 * 809 * @hsotg: Programming view of DWC_otg controller 810 * @num: Tx FIFO to flush 811 */ 812 void dwc2_flush_tx_fifo(struct dwc2_hsotg *hsotg, const int num) 813 { 814 u32 greset; 815 816 dev_vdbg(hsotg->dev, "Flush Tx FIFO %d\n", num); 817 818 /* Wait for AHB master IDLE state */ 819 if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, GRSTCTL_AHBIDLE, 10000)) 820 dev_warn(hsotg->dev, "%s: HANG! AHB Idle GRSCTL\n", 821 __func__); 822 823 greset = GRSTCTL_TXFFLSH; 824 greset |= num << GRSTCTL_TXFNUM_SHIFT & GRSTCTL_TXFNUM_MASK; 825 dwc2_writel(hsotg, greset, GRSTCTL); 826 827 if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_TXFFLSH, 10000)) 828 dev_warn(hsotg->dev, "%s: HANG! timeout GRSTCTL GRSTCTL_TXFFLSH\n", 829 __func__); 830 831 /* Wait for at least 3 PHY Clocks */ 832 udelay(1); 833 } 834 835 /** 836 * dwc2_flush_rx_fifo() - Flushes the Rx FIFO 837 * 838 * @hsotg: Programming view of DWC_otg controller 839 */ 840 void dwc2_flush_rx_fifo(struct dwc2_hsotg *hsotg) 841 { 842 u32 greset; 843 844 dev_vdbg(hsotg->dev, "%s()\n", __func__); 845 846 /* Wait for AHB master IDLE state */ 847 if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, GRSTCTL_AHBIDLE, 10000)) 848 dev_warn(hsotg->dev, "%s: HANG! AHB Idle GRSCTL\n", 849 __func__); 850 851 greset = GRSTCTL_RXFFLSH; 852 dwc2_writel(hsotg, greset, GRSTCTL); 853 854 /* Wait for RxFIFO flush done */ 855 if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_RXFFLSH, 10000)) 856 dev_warn(hsotg->dev, "%s: HANG! timeout GRSTCTL GRSTCTL_RXFFLSH\n", 857 __func__); 858 859 /* Wait for at least 3 PHY Clocks */ 860 udelay(1); 861 } 862 863 bool dwc2_is_controller_alive(struct dwc2_hsotg *hsotg) 864 { 865 if (dwc2_readl(hsotg, GSNPSID) == 0xffffffff) 866 return false; 867 else 868 return true; 869 } 870 871 /** 872 * dwc2_enable_global_interrupts() - Enables the controller's Global 873 * Interrupt in the AHB Config register 874 * 875 * @hsotg: Programming view of DWC_otg controller 876 */ 877 void dwc2_enable_global_interrupts(struct dwc2_hsotg *hsotg) 878 { 879 u32 ahbcfg = dwc2_readl(hsotg, GAHBCFG); 880 881 ahbcfg |= GAHBCFG_GLBL_INTR_EN; 882 dwc2_writel(hsotg, ahbcfg, GAHBCFG); 883 } 884 885 /** 886 * dwc2_disable_global_interrupts() - Disables the controller's Global 887 * Interrupt in the AHB Config register 888 * 889 * @hsotg: Programming view of DWC_otg controller 890 */ 891 void dwc2_disable_global_interrupts(struct dwc2_hsotg *hsotg) 892 { 893 u32 ahbcfg = dwc2_readl(hsotg, GAHBCFG); 894 895 ahbcfg &= ~GAHBCFG_GLBL_INTR_EN; 896 dwc2_writel(hsotg, ahbcfg, GAHBCFG); 897 } 898 899 /* Returns the controller's GHWCFG2.OTG_MODE. */ 900 unsigned int dwc2_op_mode(struct dwc2_hsotg *hsotg) 901 { 902 u32 ghwcfg2 = dwc2_readl(hsotg, GHWCFG2); 903 904 return (ghwcfg2 & GHWCFG2_OP_MODE_MASK) >> 905 GHWCFG2_OP_MODE_SHIFT; 906 } 907 908 /* Returns true if the controller is capable of DRD. */ 909 bool dwc2_hw_is_otg(struct dwc2_hsotg *hsotg) 910 { 911 unsigned int op_mode = dwc2_op_mode(hsotg); 912 913 return (op_mode == GHWCFG2_OP_MODE_HNP_SRP_CAPABLE) || 914 (op_mode == GHWCFG2_OP_MODE_SRP_ONLY_CAPABLE) || 915 (op_mode == GHWCFG2_OP_MODE_NO_HNP_SRP_CAPABLE); 916 } 917 918 /* Returns true if the controller is host-only. */ 919 bool dwc2_hw_is_host(struct dwc2_hsotg *hsotg) 920 { 921 unsigned int op_mode = dwc2_op_mode(hsotg); 922 923 return (op_mode == GHWCFG2_OP_MODE_SRP_CAPABLE_HOST) || 924 (op_mode == GHWCFG2_OP_MODE_NO_SRP_CAPABLE_HOST); 925 } 926 927 /* Returns true if the controller is device-only. */ 928 bool dwc2_hw_is_device(struct dwc2_hsotg *hsotg) 929 { 930 unsigned int op_mode = dwc2_op_mode(hsotg); 931 932 return (op_mode == GHWCFG2_OP_MODE_SRP_CAPABLE_DEVICE) || 933 (op_mode == GHWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE); 934 } 935 936 /** 937 * dwc2_hsotg_wait_bit_set - Waits for bit to be set. 938 * @hsotg: Programming view of DWC_otg controller. 939 * @offset: Register's offset where bit/bits must be set. 940 * @mask: Mask of the bit/bits which must be set. 941 * @timeout: Timeout to wait. 942 * 943 * Return: 0 if bit/bits are set or -ETIMEDOUT in case of timeout. 944 */ 945 int dwc2_hsotg_wait_bit_set(struct dwc2_hsotg *hsotg, u32 offset, u32 mask, 946 u32 timeout) 947 { 948 u32 i; 949 950 for (i = 0; i < timeout; i++) { 951 if (dwc2_readl(hsotg, offset) & mask) 952 return 0; 953 udelay(1); 954 } 955 956 return -ETIMEDOUT; 957 } 958 959 /** 960 * dwc2_hsotg_wait_bit_clear - Waits for bit to be clear. 961 * @hsotg: Programming view of DWC_otg controller. 962 * @offset: Register's offset where bit/bits must be set. 963 * @mask: Mask of the bit/bits which must be set. 964 * @timeout: Timeout to wait. 965 * 966 * Return: 0 if bit/bits are set or -ETIMEDOUT in case of timeout. 967 */ 968 int dwc2_hsotg_wait_bit_clear(struct dwc2_hsotg *hsotg, u32 offset, u32 mask, 969 u32 timeout) 970 { 971 u32 i; 972 973 for (i = 0; i < timeout; i++) { 974 if (!(dwc2_readl(hsotg, offset) & mask)) 975 return 0; 976 udelay(1); 977 } 978 979 return -ETIMEDOUT; 980 } 981 982 /* 983 * Initializes the FSLSPClkSel field of the HCFG register depending on the 984 * PHY type 985 */ 986 void dwc2_init_fs_ls_pclk_sel(struct dwc2_hsotg *hsotg) 987 { 988 u32 hcfg, val; 989 990 if ((hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_ULPI && 991 hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED && 992 hsotg->params.ulpi_fs_ls) || 993 hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS) { 994 /* Full speed PHY */ 995 val = HCFG_FSLSPCLKSEL_48_MHZ; 996 } else { 997 /* High speed PHY running at full speed or high speed */ 998 val = HCFG_FSLSPCLKSEL_30_60_MHZ; 999 } 1000 1001 dev_dbg(hsotg->dev, "Initializing HCFG.FSLSPClkSel to %08x\n", val); 1002 hcfg = dwc2_readl(hsotg, HCFG); 1003 hcfg &= ~HCFG_FSLSPCLKSEL_MASK; 1004 hcfg |= val << HCFG_FSLSPCLKSEL_SHIFT; 1005 dwc2_writel(hsotg, hcfg, HCFG); 1006 } 1007 1008 static int dwc2_fs_phy_init(struct dwc2_hsotg *hsotg, bool select_phy) 1009 { 1010 u32 usbcfg, ggpio, i2cctl; 1011 int retval = 0; 1012 1013 /* 1014 * core_init() is now called on every switch so only call the 1015 * following for the first time through 1016 */ 1017 if (select_phy) { 1018 dev_dbg(hsotg->dev, "FS PHY selected\n"); 1019 1020 usbcfg = dwc2_readl(hsotg, GUSBCFG); 1021 if (!(usbcfg & GUSBCFG_PHYSEL)) { 1022 usbcfg |= GUSBCFG_PHYSEL; 1023 dwc2_writel(hsotg, usbcfg, GUSBCFG); 1024 1025 /* Reset after a PHY select */ 1026 retval = dwc2_core_reset(hsotg, false); 1027 1028 if (retval) { 1029 dev_err(hsotg->dev, 1030 "%s: Reset failed, aborting", __func__); 1031 return retval; 1032 } 1033 } 1034 1035 if (hsotg->params.activate_stm_fs_transceiver) { 1036 ggpio = dwc2_readl(hsotg, GGPIO); 1037 if (!(ggpio & GGPIO_STM32_OTG_GCCFG_PWRDWN)) { 1038 dev_dbg(hsotg->dev, "Activating transceiver\n"); 1039 /* 1040 * STM32F4x9 uses the GGPIO register as general 1041 * core configuration register. 1042 */ 1043 ggpio |= GGPIO_STM32_OTG_GCCFG_PWRDWN; 1044 dwc2_writel(hsotg, ggpio, GGPIO); 1045 } 1046 } 1047 } 1048 1049 /* 1050 * Program DCFG.DevSpd or HCFG.FSLSPclkSel to 48Mhz in FS. Also 1051 * do this on HNP Dev/Host mode switches (done in dev_init and 1052 * host_init). 1053 */ 1054 if (dwc2_is_host_mode(hsotg)) 1055 dwc2_init_fs_ls_pclk_sel(hsotg); 1056 1057 if (hsotg->params.i2c_enable) { 1058 dev_dbg(hsotg->dev, "FS PHY enabling I2C\n"); 1059 1060 /* Program GUSBCFG.OtgUtmiFsSel to I2C */ 1061 usbcfg = dwc2_readl(hsotg, GUSBCFG); 1062 usbcfg |= GUSBCFG_OTG_UTMI_FS_SEL; 1063 dwc2_writel(hsotg, usbcfg, GUSBCFG); 1064 1065 /* Program GI2CCTL.I2CEn */ 1066 i2cctl = dwc2_readl(hsotg, GI2CCTL); 1067 i2cctl &= ~GI2CCTL_I2CDEVADDR_MASK; 1068 i2cctl |= 1 << GI2CCTL_I2CDEVADDR_SHIFT; 1069 i2cctl &= ~GI2CCTL_I2CEN; 1070 dwc2_writel(hsotg, i2cctl, GI2CCTL); 1071 i2cctl |= GI2CCTL_I2CEN; 1072 dwc2_writel(hsotg, i2cctl, GI2CCTL); 1073 } 1074 1075 return retval; 1076 } 1077 1078 static int dwc2_hs_phy_init(struct dwc2_hsotg *hsotg, bool select_phy) 1079 { 1080 u32 usbcfg, usbcfg_old; 1081 int retval = 0; 1082 1083 if (!select_phy) 1084 return 0; 1085 1086 usbcfg = dwc2_readl(hsotg, GUSBCFG); 1087 usbcfg_old = usbcfg; 1088 1089 /* 1090 * HS PHY parameters. These parameters are preserved during soft reset 1091 * so only program the first time. Do a soft reset immediately after 1092 * setting phyif. 1093 */ 1094 switch (hsotg->params.phy_type) { 1095 case DWC2_PHY_TYPE_PARAM_ULPI: 1096 /* ULPI interface */ 1097 dev_dbg(hsotg->dev, "HS ULPI PHY selected\n"); 1098 usbcfg |= GUSBCFG_ULPI_UTMI_SEL; 1099 usbcfg &= ~(GUSBCFG_PHYIF16 | GUSBCFG_DDRSEL); 1100 if (hsotg->params.phy_ulpi_ddr) 1101 usbcfg |= GUSBCFG_DDRSEL; 1102 1103 /* Set external VBUS indicator as needed. */ 1104 if (hsotg->params.oc_disable) 1105 usbcfg |= (GUSBCFG_ULPI_INT_VBUS_IND | 1106 GUSBCFG_INDICATORPASSTHROUGH); 1107 break; 1108 case DWC2_PHY_TYPE_PARAM_UTMI: 1109 /* UTMI+ interface */ 1110 dev_dbg(hsotg->dev, "HS UTMI+ PHY selected\n"); 1111 usbcfg &= ~(GUSBCFG_ULPI_UTMI_SEL | GUSBCFG_PHYIF16); 1112 if (hsotg->params.phy_utmi_width == 16) 1113 usbcfg |= GUSBCFG_PHYIF16; 1114 break; 1115 default: 1116 dev_err(hsotg->dev, "FS PHY selected at HS!\n"); 1117 break; 1118 } 1119 1120 if (usbcfg != usbcfg_old) { 1121 dwc2_writel(hsotg, usbcfg, GUSBCFG); 1122 1123 /* Reset after setting the PHY parameters */ 1124 retval = dwc2_core_reset(hsotg, false); 1125 if (retval) { 1126 dev_err(hsotg->dev, 1127 "%s: Reset failed, aborting", __func__); 1128 return retval; 1129 } 1130 } 1131 1132 return retval; 1133 } 1134 1135 static void dwc2_set_turnaround_time(struct dwc2_hsotg *hsotg) 1136 { 1137 u32 usbcfg; 1138 1139 if (hsotg->params.phy_type != DWC2_PHY_TYPE_PARAM_UTMI) 1140 return; 1141 1142 usbcfg = dwc2_readl(hsotg, GUSBCFG); 1143 1144 usbcfg &= ~GUSBCFG_USBTRDTIM_MASK; 1145 if (hsotg->params.phy_utmi_width == 16) 1146 usbcfg |= 5 << GUSBCFG_USBTRDTIM_SHIFT; 1147 else 1148 usbcfg |= 9 << GUSBCFG_USBTRDTIM_SHIFT; 1149 1150 dwc2_writel(hsotg, usbcfg, GUSBCFG); 1151 } 1152 1153 int dwc2_phy_init(struct dwc2_hsotg *hsotg, bool select_phy) 1154 { 1155 u32 usbcfg; 1156 int retval = 0; 1157 1158 if ((hsotg->params.speed == DWC2_SPEED_PARAM_FULL || 1159 hsotg->params.speed == DWC2_SPEED_PARAM_LOW) && 1160 hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS) { 1161 /* If FS/LS mode with FS/LS PHY */ 1162 retval = dwc2_fs_phy_init(hsotg, select_phy); 1163 if (retval) 1164 return retval; 1165 } else { 1166 /* High speed PHY */ 1167 retval = dwc2_hs_phy_init(hsotg, select_phy); 1168 if (retval) 1169 return retval; 1170 1171 if (dwc2_is_device_mode(hsotg)) 1172 dwc2_set_turnaround_time(hsotg); 1173 } 1174 1175 if (hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_ULPI && 1176 hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED && 1177 hsotg->params.ulpi_fs_ls) { 1178 dev_dbg(hsotg->dev, "Setting ULPI FSLS\n"); 1179 usbcfg = dwc2_readl(hsotg, GUSBCFG); 1180 usbcfg |= GUSBCFG_ULPI_FS_LS; 1181 usbcfg |= GUSBCFG_ULPI_CLK_SUSP_M; 1182 dwc2_writel(hsotg, usbcfg, GUSBCFG); 1183 } else { 1184 usbcfg = dwc2_readl(hsotg, GUSBCFG); 1185 usbcfg &= ~GUSBCFG_ULPI_FS_LS; 1186 usbcfg &= ~GUSBCFG_ULPI_CLK_SUSP_M; 1187 dwc2_writel(hsotg, usbcfg, GUSBCFG); 1188 } 1189 1190 return retval; 1191 } 1192 1193 MODULE_DESCRIPTION("DESIGNWARE HS OTG Core"); 1194 MODULE_AUTHOR("Synopsys, Inc."); 1195 MODULE_LICENSE("Dual BSD/GPL"); 1196