drivers/usb/dwc2/platform.c

   1 /*
   2  * platform.c - DesignWare HS OTG Controller platform driver
   3  *
   4  * Copyright (C) Matthijs Kooijman <matthijs@stdin.nl>
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions, and the following disclaimer,
  11  *    without modification.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The names of the above-listed copyright holders may not be used
  16  *    to endorse or promote products derived from this software without
  17  *    specific prior written permission.
  18  *
  19  * ALTERNATIVELY, this software may be distributed under the terms of the
  20  * GNU General Public License ("GPL") as published by the Free Software
  21  * Foundation; either version 2 of the License, or (at your option) any
  22  * later version.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  25  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  26  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  27  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  28  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  29  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  30  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  31  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  32  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  33  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  34  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include <linux/kernel.h>
  38 #include <linux/module.h>
  39 #include <linux/slab.h>
  40 #include <linux/clk.h>
  41 #include <linux/device.h>
  42 #include <linux/dma-mapping.h>
  43 #include <linux/of_device.h>
  44 #include <linux/mutex.h>
  45 #include <linux/platform_device.h>
  46 #include <linux/phy/phy.h>
  47 #include <linux/platform_data/s3c-hsotg.h>
  48
  49 #include <linux/usb/of.h>
  50
  51 #include "core.h"
  52 #include "hcd.h"
  53 #include "debug.h"
  54
  55 static const char dwc2_driver_name[] = "dwc2";
  56
  57 static const struct dwc2_core_params params_hi6220 = {
  58         .otg_cap                        = 2,    /* No HNP/SRP capable */
  59         .otg_ver                        = 0,    /* 1.3 */
  60         .dma_enable                     = 1,
  61         .dma_desc_enable                = 0,
  62         .dma_desc_fs_enable             = 0,
  63         .speed                          = 0,    /* High Speed */
  64         .enable_dynamic_fifo            = 1,
  65         .en_multiple_tx_fifo            = 1,
  66         .host_rx_fifo_size              = 512,
  67         .host_nperio_tx_fifo_size       = 512,
  68         .host_perio_tx_fifo_size        = 512,
  69         .max_transfer_size              = 65535,
  70         .max_packet_count               = 511,
  71         .host_channels                  = 16,
  72         .phy_type                       = 1,    /* UTMI */
  73         .phy_utmi_width                 = 8,
  74         .phy_ulpi_ddr                   = 0,    /* Single */
  75         .phy_ulpi_ext_vbus              = 0,
  76         .i2c_enable                     = 0,
  77         .ulpi_fs_ls                     = 0,
  78         .host_support_fs_ls_low_power   = 0,
  79         .host_ls_low_power_phy_clk      = 0,    /* 48 MHz */
  80         .ts_dline                       = 0,
  81         .reload_ctl                     = 0,
  82         .ahbcfg                         = GAHBCFG_HBSTLEN_INCR16 <<
  83                                           GAHBCFG_HBSTLEN_SHIFT,
  84         .uframe_sched                   = 0,
  85         .external_id_pin_ctl            = -1,
  86         .hibernation                    = -1,
  87 };
  88
  89 static const struct dwc2_core_params params_bcm2835 = {
  90         .otg_cap                        = 0,    /* HNP/SRP capable */
  91         .otg_ver                        = 0,    /* 1.3 */
  92         .dma_enable                     = 1,
  93         .dma_desc_enable                = 0,
  94         .dma_desc_fs_enable             = 0,
  95         .speed                          = 0,    /* High Speed */
  96         .enable_dynamic_fifo            = 1,
  97         .en_multiple_tx_fifo            = 1,
  98         .host_rx_fifo_size              = 774,  /* 774 DWORDs */
  99         .host_nperio_tx_fifo_size       = 256,  /* 256 DWORDs */
 100         .host_perio_tx_fifo_size        = 512,  /* 512 DWORDs */
 101         .max_transfer_size              = 65535,
 102         .max_packet_count               = 511,
 103         .host_channels                  = 8,
 104         .phy_type                       = 1,    /* UTMI */
 105         .phy_utmi_width                 = 8,    /* 8 bits */
 106         .phy_ulpi_ddr                   = 0,    /* Single */
 107         .phy_ulpi_ext_vbus              = 0,
 108         .i2c_enable                     = 0,
 109         .ulpi_fs_ls                     = 0,
 110         .host_support_fs_ls_low_power   = 0,
 111         .host_ls_low_power_phy_clk      = 0,    /* 48 MHz */
 112         .ts_dline                       = 0,
 113         .reload_ctl                     = 0,
 114         .ahbcfg                         = 0x10,
 115         .uframe_sched                   = 0,
 116         .external_id_pin_ctl            = -1,
 117         .hibernation                    = -1,
 118 };
 119
 120 static const struct dwc2_core_params params_rk3066 = {
 121         .otg_cap                        = 2,    /* non-HNP/non-SRP */
 122         .otg_ver                        = -1,
 123         .dma_enable                     = -1,
 124         .dma_desc_enable                = 0,
 125         .dma_desc_fs_enable             = 0,
 126         .speed                          = -1,
 127         .enable_dynamic_fifo            = 1,
 128         .en_multiple_tx_fifo            = -1,
 129         .host_rx_fifo_size              = 520,  /* 520 DWORDs */
 130         .host_nperio_tx_fifo_size       = 128,  /* 128 DWORDs */
 131         .host_perio_tx_fifo_size        = 256,  /* 256 DWORDs */
 132         .max_transfer_size              = 65535,
 133         .max_packet_count               = -1,
 134         .host_channels                  = -1,
 135         .phy_type                       = -1,
 136         .phy_utmi_width                 = -1,
 137         .phy_ulpi_ddr                   = -1,
 138         .phy_ulpi_ext_vbus              = -1,
 139         .i2c_enable                     = -1,
 140         .ulpi_fs_ls                     = -1,
 141         .host_support_fs_ls_low_power   = -1,
 142         .host_ls_low_power_phy_clk      = -1,
 143         .ts_dline                       = -1,
 144         .reload_ctl                     = -1,
 145         .ahbcfg                         = GAHBCFG_HBSTLEN_INCR16 <<
 146                                           GAHBCFG_HBSTLEN_SHIFT,
 147         .uframe_sched                   = -1,
 148         .external_id_pin_ctl            = -1,
 149         .hibernation                    = -1,
 150 };
 151
 152 /*
 153  * Check the dr_mode against the module configuration and hardware
 154  * capabilities.
 155  *
 156  * The hardware, module, and dr_mode, can each be set to host, device,
 157  * or otg. Check that all these values are compatible and adjust the
 158  * value of dr_mode if possible.
 159  *
 160  *                      actual
 161  *    HW  MOD dr_mode   dr_mode
 162  *  ------------------------------
 163  *   HST  HST  any    :  HST
 164  *   HST  DEV  any    :  ---
 165  *   HST  OTG  any    :  HST
 166  *
 167  *   DEV  HST  any    :  ---
 168  *   DEV  DEV  any    :  DEV
 169  *   DEV  OTG  any    :  DEV
 170  *
 171  *   OTG  HST  any    :  HST
 172  *   OTG  DEV  any    :  DEV
 173  *   OTG  OTG  any    :  dr_mode
 174  */
 175 static int dwc2_get_dr_mode(struct dwc2_hsotg *hsotg)
 176 {
 177         enum usb_dr_mode mode;
 178
 179         hsotg->dr_mode = usb_get_dr_mode(hsotg->dev);
 180         if (hsotg->dr_mode == USB_DR_MODE_UNKNOWN)
 181                 hsotg->dr_mode = USB_DR_MODE_OTG;
 182
 183         mode = hsotg->dr_mode;
 184
 185         if (dwc2_hw_is_device(hsotg)) {
 186                 if (IS_ENABLED(CONFIG_USB_DWC2_HOST)) {
 187                         dev_err(hsotg->dev,
 188                                 "Controller does not support host mode.\n");
 189                         return -EINVAL;
 190                 }
 191                 mode = USB_DR_MODE_PERIPHERAL;
 192         } else if (dwc2_hw_is_host(hsotg)) {
 193                 if (IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL)) {
 194                         dev_err(hsotg->dev,
 195                                 "Controller does not support device mode.\n");
 196                         return -EINVAL;
 197                 }
 198                 mode = USB_DR_MODE_HOST;
 199         } else {
 200                 if (IS_ENABLED(CONFIG_USB_DWC2_HOST))
 201                         mode = USB_DR_MODE_HOST;
 202                 else if (IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL))
 203                         mode = USB_DR_MODE_PERIPHERAL;
 204         }
 205
 206         if (mode != hsotg->dr_mode) {
 207                 dev_warn(hsotg->dev,
 208                         "Configuration mismatch. dr_mode forced to %s\n",
 209                         mode == USB_DR_MODE_HOST ? "host" : "device");
 210
 211                 hsotg->dr_mode = mode;
 212         }
 213
 214         return 0;
 215 }
 216
 217 static int __dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg)
 218 {
 219         struct platform_device *pdev = to_platform_device(hsotg->dev);
 220         int ret;
 221
 222         ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies),
 223                                     hsotg->supplies);
 224         if (ret)
 225                 return ret;
 226
 227         if (hsotg->clk) {
 228                 ret = clk_prepare_enable(hsotg->clk);
 229                 if (ret)
 230                         return ret;
 231         }
 232
 233         if (hsotg->uphy)
 234                 ret = usb_phy_init(hsotg->uphy);
 235         else if (hsotg->plat && hsotg->plat->phy_init)
 236                 ret = hsotg->plat->phy_init(pdev, hsotg->plat->phy_type);
 237         else {
 238                 ret = phy_power_on(hsotg->phy);
 239                 if (ret == 0)
 240                         ret = phy_init(hsotg->phy);
 241         }
 242
 243         return ret;
 244 }
 245
 246 /**
 247  * dwc2_lowlevel_hw_enable - enable platform lowlevel hw resources
 248  * @hsotg: The driver state
 249  *
 250  * A wrapper for platform code responsible for controlling
 251  * low-level USB platform resources (phy, clock, regulators)
 252  */
 253 int dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg)
 254 {
 255         int ret = __dwc2_lowlevel_hw_enable(hsotg);
 256
 257         if (ret == 0)
 258                 hsotg->ll_hw_enabled = true;
 259         return ret;
 260 }
 261
 262 static int __dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg)
 263 {
 264         struct platform_device *pdev = to_platform_device(hsotg->dev);
 265         int ret = 0;
 266
 267         if (hsotg->uphy)
 268                 usb_phy_shutdown(hsotg->uphy);
 269         else if (hsotg->plat && hsotg->plat->phy_exit)
 270                 ret = hsotg->plat->phy_exit(pdev, hsotg->plat->phy_type);
 271         else {
 272                 ret = phy_exit(hsotg->phy);
 273                 if (ret == 0)
 274                         ret = phy_power_off(hsotg->phy);
 275         }
 276         if (ret)
 277                 return ret;
 278
 279         if (hsotg->clk)
 280                 clk_disable_unprepare(hsotg->clk);
 281
 282         ret = regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies),
 283                                      hsotg->supplies);
 284
 285         return ret;
 286 }
 287
 288 /**
 289  * dwc2_lowlevel_hw_disable - disable platform lowlevel hw resources
 290  * @hsotg: The driver state
 291  *
 292  * A wrapper for platform code responsible for controlling
 293  * low-level USB platform resources (phy, clock, regulators)
 294  */
 295 int dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg)
 296 {
 297         int ret = __dwc2_lowlevel_hw_disable(hsotg);
 298
 299         if (ret == 0)
 300                 hsotg->ll_hw_enabled = false;
 301         return ret;
 302 }
 303
 304 static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
 305 {
 306         int i, ret;
 307
 308         /* Set default UTMI width */
 309         hsotg->phyif = GUSBCFG_PHYIF16;
 310
 311         /*
 312          * Attempt to find a generic PHY, then look for an old style
 313          * USB PHY and then fall back to pdata
 314          */
 315         hsotg->phy = devm_phy_get(hsotg->dev, "usb2-phy");
 316         if (IS_ERR(hsotg->phy)) {
 317                 ret = PTR_ERR(hsotg->phy);
 318                 switch (ret) {
 319                 case -ENODEV:
 320                 case -ENOSYS:
 321                         hsotg->phy = NULL;
 322                         break;
 323                 case -EPROBE_DEFER:
 324                         return ret;
 325                 default:
 326                         dev_err(hsotg->dev, "error getting phy %d\n", ret);
 327                         return ret;
 328                 }
 329         }
 330
 331         if (!hsotg->phy) {
 332                 hsotg->uphy = devm_usb_get_phy(hsotg->dev, USB_PHY_TYPE_USB2);
 333                 if (IS_ERR(hsotg->uphy)) {
 334                         ret = PTR_ERR(hsotg->uphy);
 335                         switch (ret) {
 336                         case -ENODEV:
 337                         case -ENXIO:
 338                                 hsotg->uphy = NULL;
 339                                 break;
 340                         case -EPROBE_DEFER:
 341                                 return ret;
 342                         default:
 343                                 dev_err(hsotg->dev, "error getting usb phy %d\n",
 344                                         ret);
 345                                 return ret;
 346                         }
 347                 }
 348         }
 349
 350         hsotg->plat = dev_get_platdata(hsotg->dev);
 351
 352         if (hsotg->phy) {
 353                 /*
 354                  * If using the generic PHY framework, check if the PHY bus
 355                  * width is 8-bit and set the phyif appropriately.
 356                  */
 357                 if (phy_get_bus_width(hsotg->phy) == 8)
 358                         hsotg->phyif = GUSBCFG_PHYIF8;
 359         }
 360
 361         /* Clock */
 362         hsotg->clk = devm_clk_get(hsotg->dev, "otg");
 363         if (IS_ERR(hsotg->clk)) {
 364                 hsotg->clk = NULL;
 365                 dev_dbg(hsotg->dev, "cannot get otg clock\n");
 366         }
 367
 368         /* Regulators */
 369         for (i = 0; i < ARRAY_SIZE(hsotg->supplies); i++)
 370                 hsotg->supplies[i].supply = dwc2_hsotg_supply_names[i];
 371
 372         ret = devm_regulator_bulk_get(hsotg->dev, ARRAY_SIZE(hsotg->supplies),
 373                                       hsotg->supplies);
 374         if (ret) {
 375                 dev_err(hsotg->dev, "failed to request supplies: %d\n", ret);
 376                 return ret;
 377         }
 378         return 0;
 379 }
 380
 381 /**
 382  * dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the
 383  * DWC_otg driver
 384  *
 385  * @dev: Platform device
 386  *
 387  * This routine is called, for example, when the rmmod command is executed. The
 388  * device may or may not be electrically present. If it is present, the driver
 389  * stops device processing. Any resources used on behalf of this device are
 390  * freed.
 391  */
 392 static int dwc2_driver_remove(struct platform_device *dev)
 393 {
 394         struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
 395
 396         dwc2_debugfs_exit(hsotg);
 397         if (hsotg->hcd_enabled)
 398                 dwc2_hcd_remove(hsotg);
 399         if (hsotg->gadget_enabled)
 400                 dwc2_hsotg_remove(hsotg);
 401
 402         if (hsotg->ll_hw_enabled)
 403                 dwc2_lowlevel_hw_disable(hsotg);
 404
 405         return 0;
 406 }
 407
 408 /**
 409  * dwc2_driver_shutdown() - Called on device shutdown
 410  *
 411  * @dev: Platform device
 412  *
 413  * In specific conditions (involving usb hubs) dwc2 devices can create a
 414  * lot of interrupts, even to the point of overwhelming devices running
 415  * at low frequencies. Some devices need to do special clock handling
 416  * at shutdown-time which may bring the system clock below the threshold
 417  * of being able to handle the dwc2 interrupts. Disabling dwc2-irqs
 418  * prevents reboots/poweroffs from getting stuck in such cases.
 419  */
 420 static void dwc2_driver_shutdown(struct platform_device *dev)
 421 {
 422         struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
 423
 424         disable_irq(hsotg->irq);
 425 }
 426
 427 static const struct of_device_id dwc2_of_match_table[] = {
 428         { .compatible = "brcm,bcm2835-usb", .data = &params_bcm2835 },
 429         { .compatible = "hisilicon,hi6220-usb", .data = &params_hi6220 },
 430         { .compatible = "rockchip,rk3066-usb", .data = &params_rk3066 },
 431         { .compatible = "snps,dwc2", .data = NULL },
 432         { .compatible = "samsung,s3c6400-hsotg", .data = NULL},
 433         {},
 434 };
 435 MODULE_DEVICE_TABLE(of, dwc2_of_match_table);
 436
 437 /**
 438  * dwc2_driver_probe() - Called when the DWC_otg core is bound to the DWC_otg
 439  * driver
 440  *
 441  * @dev: Platform device
 442  *
 443  * This routine creates the driver components required to control the device
 444  * (core, HCD, and PCD) and initializes the device. The driver components are
 445  * stored in a dwc2_hsotg structure. A reference to the dwc2_hsotg is saved
 446  * in the device private data. This allows the driver to access the dwc2_hsotg
 447  * structure on subsequent calls to driver methods for this device.
 448  */
 449 static int dwc2_driver_probe(struct platform_device *dev)
 450 {
 451         const struct of_device_id *match;
 452         const struct dwc2_core_params *params;
 453         struct dwc2_core_params defparams;
 454         struct dwc2_hsotg *hsotg;
 455         struct resource *res;
 456         int retval;
 457
 458         match = of_match_device(dwc2_of_match_table, &dev->dev);
 459         if (match && match->data) {
 460                 params = match->data;
 461         } else {
 462                 /* Default all params to autodetect */
 463                 dwc2_set_all_params(&defparams, -1);
 464                 params = &defparams;
 465
 466                 /*
 467                  * Disable descriptor dma mode by default as the HW can support
 468                  * it, but does not support it for SPLIT transactions.
 469                  * Disable it for FS devices as well.
 470                  */
 471                 defparams.dma_desc_enable = 0;
 472                 defparams.dma_desc_fs_enable = 0;
 473         }
 474
 475         hsotg = devm_kzalloc(&dev->dev, sizeof(*hsotg), GFP_KERNEL);
 476         if (!hsotg)
 477                 return -ENOMEM;
 478
 479         hsotg->dev = &dev->dev;
 480
 481         /*
 482          * Use reasonable defaults so platforms don't have to provide these.
 483          */
 484         if (!dev->dev.dma_mask)
 485                 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
 486         retval = dma_set_coherent_mask(&dev->dev, DMA_BIT_MASK(32));
 487         if (retval)
 488                 return retval;
 489
 490         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 491         hsotg->regs = devm_ioremap_resource(&dev->dev, res);
 492         if (IS_ERR(hsotg->regs))
 493                 return PTR_ERR(hsotg->regs);
 494
 495         dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
 496                 (unsigned long)res->start, hsotg->regs);
 497
 498         retval = dwc2_lowlevel_hw_init(hsotg);
 499         if (retval)
 500                 return retval;
 501
 502         spin_lock_init(&hsotg->lock);
 503
 504         hsotg->core_params = devm_kzalloc(&dev->dev,
 505                                 sizeof(*hsotg->core_params), GFP_KERNEL);
 506         if (!hsotg->core_params)
 507                 return -ENOMEM;
 508
 509         dwc2_set_all_params(hsotg->core_params, -1);
 510
 511         hsotg->irq = platform_get_irq(dev, 0);
 512         if (hsotg->irq < 0) {
 513                 dev_err(&dev->dev, "missing IRQ resource\n");
 514                 return hsotg->irq;
 515         }
 516
 517         dev_dbg(hsotg->dev, "registering common handler for irq%d\n",
 518                 hsotg->irq);
 519         retval = devm_request_irq(hsotg->dev, hsotg->irq,
 520                                   dwc2_handle_common_intr, IRQF_SHARED,
 521                                   dev_name(hsotg->dev), hsotg);
 522         if (retval)
 523                 return retval;
 524
 525         retval = dwc2_lowlevel_hw_enable(hsotg);
 526         if (retval)
 527                 return retval;
 528
 529         retval = dwc2_get_dr_mode(hsotg);
 530         if (retval)
 531                 return retval;
 532
 533         /* Reset the controller and detect hardware config values */
 534         retval = dwc2_get_hwparams(hsotg);
 535         if (retval)
 536                 goto error;
 537
 538         /* Validate parameter values */
 539         dwc2_set_parameters(hsotg, params);
 540
 541         dwc2_force_dr_mode(hsotg);
 542
 543         if (hsotg->dr_mode != USB_DR_MODE_HOST) {
 544                 retval = dwc2_gadget_init(hsotg, hsotg->irq);
 545                 if (retval)
 546                         goto error;
 547                 hsotg->gadget_enabled = 1;
 548         }
 549
 550         if (hsotg->dr_mode != USB_DR_MODE_PERIPHERAL) {
 551                 retval = dwc2_hcd_init(hsotg, hsotg->irq);
 552                 if (retval) {
 553                         if (hsotg->gadget_enabled)
 554                                 dwc2_hsotg_remove(hsotg);
 555                         goto error;
 556                 }
 557                 hsotg->hcd_enabled = 1;
 558         }
 559
 560         platform_set_drvdata(dev, hsotg);
 561
 562         dwc2_debugfs_init(hsotg);
 563
 564         /* Gadget code manages lowlevel hw on its own */
 565         if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL)
 566                 dwc2_lowlevel_hw_disable(hsotg);
 567
 568         return 0;
 569
 570 error:
 571         dwc2_lowlevel_hw_disable(hsotg);
 572         return retval;
 573 }
 574
 575 static int __maybe_unused dwc2_suspend(struct device *dev)
 576 {
 577         struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev);
 578         int ret = 0;
 579
 580         if (dwc2_is_device_mode(dwc2))
 581                 dwc2_hsotg_suspend(dwc2);
 582
 583         if (dwc2->ll_hw_enabled)
 584                 ret = __dwc2_lowlevel_hw_disable(dwc2);
 585
 586         return ret;
 587 }
 588
 589 static int __maybe_unused dwc2_resume(struct device *dev)
 590 {
 591         struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev);
 592         int ret = 0;
 593
 594         if (dwc2->ll_hw_enabled) {
 595                 ret = __dwc2_lowlevel_hw_enable(dwc2);
 596                 if (ret)
 597                         return ret;
 598         }
 599
 600         if (dwc2_is_device_mode(dwc2))
 601                 ret = dwc2_hsotg_resume(dwc2);
 602
 603         return ret;
 604 }
 605
 606 static const struct dev_pm_ops dwc2_dev_pm_ops = {
 607         SET_SYSTEM_SLEEP_PM_OPS(dwc2_suspend, dwc2_resume)
 608 };
 609
 610 static struct platform_driver dwc2_platform_driver = {
 611         .driver = {
 612                 .name = dwc2_driver_name,
 613                 .of_match_table = dwc2_of_match_table,
 614                 .pm = &dwc2_dev_pm_ops,
 615         },
 616         .probe = dwc2_driver_probe,
 617         .remove = dwc2_driver_remove,
 618         .shutdown = dwc2_driver_shutdown,
 619 };
 620
 621 module_platform_driver(dwc2_platform_driver);
 622
 623 MODULE_DESCRIPTION("DESIGNWARE HS OTG Platform Glue");
 624 MODULE_AUTHOR("Matthijs Kooijman <matthijs@stdin.nl>");
 625 MODULE_LICENSE("Dual BSD/GPL");