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 #include <linux/reset.h>
  49
  50 #include <linux/usb/of.h>
  51
  52 #include "core.h"
  53 #include "hcd.h"
  54 #include "debug.h"
  55
  56 static const char dwc2_driver_name[] = "dwc2";
  57
  58 static const struct dwc2_core_params params_hi6220 = {
  59         .otg_cap                        = 2,    /* No HNP/SRP capable */
  60         .otg_ver                        = 0,    /* 1.3 */
  61         .dma_enable                     = 1,
  62         .dma_desc_enable                = 0,
  63         .dma_desc_fs_enable             = 0,
  64         .speed                          = 0,    /* High Speed */
  65         .enable_dynamic_fifo            = 1,
  66         .en_multiple_tx_fifo            = 1,
  67         .host_rx_fifo_size              = 512,
  68         .host_nperio_tx_fifo_size       = 512,
  69         .host_perio_tx_fifo_size        = 512,
  70         .max_transfer_size              = 65535,
  71         .max_packet_count               = 511,
  72         .host_channels                  = 16,
  73         .phy_type                       = 1,    /* UTMI */
  74         .phy_utmi_width                 = 8,
  75         .phy_ulpi_ddr                   = 0,    /* Single */
  76         .phy_ulpi_ext_vbus              = 0,
  77         .i2c_enable                     = 0,
  78         .ulpi_fs_ls                     = 0,
  79         .host_support_fs_ls_low_power   = 0,
  80         .host_ls_low_power_phy_clk      = 0,    /* 48 MHz */
  81         .ts_dline                       = 0,
  82         .reload_ctl                     = 0,
  83         .ahbcfg                         = GAHBCFG_HBSTLEN_INCR16 <<
  84                                           GAHBCFG_HBSTLEN_SHIFT,
  85         .uframe_sched                   = 0,
  86         .external_id_pin_ctl            = -1,
  87         .hibernation                    = -1,
  88 };
  89
  90 static const struct dwc2_core_params params_bcm2835 = {
  91         .otg_cap                        = 0,    /* HNP/SRP capable */
  92         .otg_ver                        = 0,    /* 1.3 */
  93         .dma_enable                     = 1,
  94         .dma_desc_enable                = 0,
  95         .dma_desc_fs_enable             = 0,
  96         .speed                          = 0,    /* High Speed */
  97         .enable_dynamic_fifo            = 1,
  98         .en_multiple_tx_fifo            = 1,
  99         .host_rx_fifo_size              = 774,  /* 774 DWORDs */
 100         .host_nperio_tx_fifo_size       = 256,  /* 256 DWORDs */
 101         .host_perio_tx_fifo_size        = 512,  /* 512 DWORDs */
 102         .max_transfer_size              = 65535,
 103         .max_packet_count               = 511,
 104         .host_channels                  = 8,
 105         .phy_type                       = 1,    /* UTMI */
 106         .phy_utmi_width                 = 8,    /* 8 bits */
 107         .phy_ulpi_ddr                   = 0,    /* Single */
 108         .phy_ulpi_ext_vbus              = 0,
 109         .i2c_enable                     = 0,
 110         .ulpi_fs_ls                     = 0,
 111         .host_support_fs_ls_low_power   = 0,
 112         .host_ls_low_power_phy_clk      = 0,    /* 48 MHz */
 113         .ts_dline                       = 0,
 114         .reload_ctl                     = 0,
 115         .ahbcfg                         = 0x10,
 116         .uframe_sched                   = 0,
 117         .external_id_pin_ctl            = -1,
 118         .hibernation                    = -1,
 119 };
 120
 121 static const struct dwc2_core_params params_rk3066 = {
 122         .otg_cap                        = 2,    /* non-HNP/non-SRP */
 123         .otg_ver                        = -1,
 124         .dma_enable                     = -1,
 125         .dma_desc_enable                = 0,
 126         .dma_desc_fs_enable             = 0,
 127         .speed                          = -1,
 128         .enable_dynamic_fifo            = 1,
 129         .en_multiple_tx_fifo            = -1,
 130         .host_rx_fifo_size              = 525,  /* 525 DWORDs */
 131         .host_nperio_tx_fifo_size       = 128,  /* 128 DWORDs */
 132         .host_perio_tx_fifo_size        = 256,  /* 256 DWORDs */
 133         .max_transfer_size              = -1,
 134         .max_packet_count               = -1,
 135         .host_channels                  = -1,
 136         .phy_type                       = -1,
 137         .phy_utmi_width                 = -1,
 138         .phy_ulpi_ddr                   = -1,
 139         .phy_ulpi_ext_vbus              = -1,
 140         .i2c_enable                     = -1,
 141         .ulpi_fs_ls                     = -1,
 142         .host_support_fs_ls_low_power   = -1,
 143         .host_ls_low_power_phy_clk      = -1,
 144         .ts_dline                       = -1,
 145         .reload_ctl                     = -1,
 146         .ahbcfg                         = GAHBCFG_HBSTLEN_INCR16 <<
 147                                           GAHBCFG_HBSTLEN_SHIFT,
 148         .uframe_sched                   = -1,
 149         .external_id_pin_ctl            = -1,
 150         .hibernation                    = -1,
 151 };
 152
 153 static const struct dwc2_core_params params_ltq = {
 154         .otg_cap                        = 2,    /* non-HNP/non-SRP */
 155         .otg_ver                        = -1,
 156         .dma_enable                     = -1,
 157         .dma_desc_enable                = -1,
 158         .dma_desc_fs_enable             = -1,
 159         .speed                          = -1,
 160         .enable_dynamic_fifo            = -1,
 161         .en_multiple_tx_fifo            = -1,
 162         .host_rx_fifo_size              = 288,  /* 288 DWORDs */
 163         .host_nperio_tx_fifo_size       = 128,  /* 128 DWORDs */
 164         .host_perio_tx_fifo_size        = 96,   /* 96 DWORDs */
 165         .max_transfer_size              = 65535,
 166         .max_packet_count               = 511,
 167         .host_channels                  = -1,
 168         .phy_type                       = -1,
 169         .phy_utmi_width                 = -1,
 170         .phy_ulpi_ddr                   = -1,
 171         .phy_ulpi_ext_vbus              = -1,
 172         .i2c_enable                     = -1,
 173         .ulpi_fs_ls                     = -1,
 174         .host_support_fs_ls_low_power   = -1,
 175         .host_ls_low_power_phy_clk      = -1,
 176         .ts_dline                       = -1,
 177         .reload_ctl                     = -1,
 178         .ahbcfg                         = GAHBCFG_HBSTLEN_INCR16 <<
 179                                           GAHBCFG_HBSTLEN_SHIFT,
 180         .uframe_sched                   = -1,
 181         .external_id_pin_ctl            = -1,
 182         .hibernation                    = -1,
 183 };
 184
 185 /*
 186  * Check the dr_mode against the module configuration and hardware
 187  * capabilities.
 188  *
 189  * The hardware, module, and dr_mode, can each be set to host, device,
 190  * or otg. Check that all these values are compatible and adjust the
 191  * value of dr_mode if possible.
 192  *
 193  *                      actual
 194  *    HW  MOD dr_mode   dr_mode
 195  *  ------------------------------
 196  *   HST  HST  any    :  HST
 197  *   HST  DEV  any    :  ---
 198  *   HST  OTG  any    :  HST
 199  *
 200  *   DEV  HST  any    :  ---
 201  *   DEV  DEV  any    :  DEV
 202  *   DEV  OTG  any    :  DEV
 203  *
 204  *   OTG  HST  any    :  HST
 205  *   OTG  DEV  any    :  DEV
 206  *   OTG  OTG  any    :  dr_mode
 207  */
 208 static int dwc2_get_dr_mode(struct dwc2_hsotg *hsotg)
 209 {
 210         enum usb_dr_mode mode;
 211
 212         hsotg->dr_mode = usb_get_dr_mode(hsotg->dev);
 213         if (hsotg->dr_mode == USB_DR_MODE_UNKNOWN)
 214                 hsotg->dr_mode = USB_DR_MODE_OTG;
 215
 216         mode = hsotg->dr_mode;
 217
 218         if (dwc2_hw_is_device(hsotg)) {
 219                 if (IS_ENABLED(CONFIG_USB_DWC2_HOST)) {
 220                         dev_err(hsotg->dev,
 221                                 "Controller does not support host mode.\n");
 222                         return -EINVAL;
 223                 }
 224                 mode = USB_DR_MODE_PERIPHERAL;
 225         } else if (dwc2_hw_is_host(hsotg)) {
 226                 if (IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL)) {
 227                         dev_err(hsotg->dev,
 228                                 "Controller does not support device mode.\n");
 229                         return -EINVAL;
 230                 }
 231                 mode = USB_DR_MODE_HOST;
 232         } else {
 233                 if (IS_ENABLED(CONFIG_USB_DWC2_HOST))
 234                         mode = USB_DR_MODE_HOST;
 235                 else if (IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL))
 236                         mode = USB_DR_MODE_PERIPHERAL;
 237         }
 238
 239         if (mode != hsotg->dr_mode) {
 240                 dev_warn(hsotg->dev,
 241                         "Configuration mismatch. dr_mode forced to %s\n",
 242                         mode == USB_DR_MODE_HOST ? "host" : "device");
 243
 244                 hsotg->dr_mode = mode;
 245         }
 246
 247         return 0;
 248 }
 249
 250 static int __dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg)
 251 {
 252         struct platform_device *pdev = to_platform_device(hsotg->dev);
 253         int ret;
 254
 255         ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies),
 256                                     hsotg->supplies);
 257         if (ret)
 258                 return ret;
 259
 260         if (hsotg->clk) {
 261                 ret = clk_prepare_enable(hsotg->clk);
 262                 if (ret)
 263                         return ret;
 264         }
 265
 266         if (hsotg->uphy)
 267                 ret = usb_phy_init(hsotg->uphy);
 268         else if (hsotg->plat && hsotg->plat->phy_init)
 269                 ret = hsotg->plat->phy_init(pdev, hsotg->plat->phy_type);
 270         else {
 271                 ret = phy_power_on(hsotg->phy);
 272                 if (ret == 0)
 273                         ret = phy_init(hsotg->phy);
 274         }
 275
 276         return ret;
 277 }
 278
 279 /**
 280  * dwc2_lowlevel_hw_enable - enable platform lowlevel hw resources
 281  * @hsotg: The driver state
 282  *
 283  * A wrapper for platform code responsible for controlling
 284  * low-level USB platform resources (phy, clock, regulators)
 285  */
 286 int dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg)
 287 {
 288         int ret = __dwc2_lowlevel_hw_enable(hsotg);
 289
 290         if (ret == 0)
 291                 hsotg->ll_hw_enabled = true;
 292         return ret;
 293 }
 294
 295 static int __dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg)
 296 {
 297         struct platform_device *pdev = to_platform_device(hsotg->dev);
 298         int ret = 0;
 299
 300         if (hsotg->uphy)
 301                 usb_phy_shutdown(hsotg->uphy);
 302         else if (hsotg->plat && hsotg->plat->phy_exit)
 303                 ret = hsotg->plat->phy_exit(pdev, hsotg->plat->phy_type);
 304         else {
 305                 ret = phy_exit(hsotg->phy);
 306                 if (ret == 0)
 307                         ret = phy_power_off(hsotg->phy);
 308         }
 309         if (ret)
 310                 return ret;
 311
 312         if (hsotg->clk)
 313                 clk_disable_unprepare(hsotg->clk);
 314
 315         ret = regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies),
 316                                      hsotg->supplies);
 317
 318         return ret;
 319 }
 320
 321 /**
 322  * dwc2_lowlevel_hw_disable - disable platform lowlevel hw resources
 323  * @hsotg: The driver state
 324  *
 325  * A wrapper for platform code responsible for controlling
 326  * low-level USB platform resources (phy, clock, regulators)
 327  */
 328 int dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg)
 329 {
 330         int ret = __dwc2_lowlevel_hw_disable(hsotg);
 331
 332         if (ret == 0)
 333                 hsotg->ll_hw_enabled = false;
 334         return ret;
 335 }
 336
 337 static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
 338 {
 339         int i, ret;
 340
 341         hsotg->reset = devm_reset_control_get_optional(hsotg->dev, "dwc2");
 342         if (IS_ERR(hsotg->reset)) {
 343                 ret = PTR_ERR(hsotg->reset);
 344                 switch (ret) {
 345                 case -ENOENT:
 346                 case -ENOTSUPP:
 347                         hsotg->reset = NULL;
 348                         break;
 349                 default:
 350                         dev_err(hsotg->dev, "error getting reset control %d\n",
 351                                 ret);
 352                         return ret;
 353                 }
 354         }
 355
 356         if (hsotg->reset)
 357                 reset_control_deassert(hsotg->reset);
 358
 359         /* Set default UTMI width */
 360         hsotg->phyif = GUSBCFG_PHYIF16;
 361
 362         /*
 363          * Attempt to find a generic PHY, then look for an old style
 364          * USB PHY and then fall back to pdata
 365          */
 366         hsotg->phy = devm_phy_get(hsotg->dev, "usb2-phy");
 367         if (IS_ERR(hsotg->phy)) {
 368                 ret = PTR_ERR(hsotg->phy);
 369                 switch (ret) {
 370                 case -ENODEV:
 371                 case -ENOSYS:
 372                         hsotg->phy = NULL;
 373                         break;
 374                 case -EPROBE_DEFER:
 375                         return ret;
 376                 default:
 377                         dev_err(hsotg->dev, "error getting phy %d\n", ret);
 378                         return ret;
 379                 }
 380         }
 381
 382         if (!hsotg->phy) {
 383                 hsotg->uphy = devm_usb_get_phy(hsotg->dev, USB_PHY_TYPE_USB2);
 384                 if (IS_ERR(hsotg->uphy)) {
 385                         ret = PTR_ERR(hsotg->uphy);
 386                         switch (ret) {
 387                         case -ENODEV:
 388                         case -ENXIO:
 389                                 hsotg->uphy = NULL;
 390                                 break;
 391                         case -EPROBE_DEFER:
 392                                 return ret;
 393                         default:
 394                                 dev_err(hsotg->dev, "error getting usb phy %d\n",
 395                                         ret);
 396                                 return ret;
 397                         }
 398                 }
 399         }
 400
 401         hsotg->plat = dev_get_platdata(hsotg->dev);
 402
 403         if (hsotg->phy) {
 404                 /*
 405                  * If using the generic PHY framework, check if the PHY bus
 406                  * width is 8-bit and set the phyif appropriately.
 407                  */
 408                 if (phy_get_bus_width(hsotg->phy) == 8)
 409                         hsotg->phyif = GUSBCFG_PHYIF8;
 410         }
 411
 412         /* Clock */
 413         hsotg->clk = devm_clk_get(hsotg->dev, "otg");
 414         if (IS_ERR(hsotg->clk)) {
 415                 hsotg->clk = NULL;
 416                 dev_dbg(hsotg->dev, "cannot get otg clock\n");
 417         }
 418
 419         /* Regulators */
 420         for (i = 0; i < ARRAY_SIZE(hsotg->supplies); i++)
 421                 hsotg->supplies[i].supply = dwc2_hsotg_supply_names[i];
 422
 423         ret = devm_regulator_bulk_get(hsotg->dev, ARRAY_SIZE(hsotg->supplies),
 424                                       hsotg->supplies);
 425         if (ret) {
 426                 dev_err(hsotg->dev, "failed to request supplies: %d\n", ret);
 427                 return ret;
 428         }
 429         return 0;
 430 }
 431
 432 /**
 433  * dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the
 434  * DWC_otg driver
 435  *
 436  * @dev: Platform device
 437  *
 438  * This routine is called, for example, when the rmmod command is executed. The
 439  * device may or may not be electrically present. If it is present, the driver
 440  * stops device processing. Any resources used on behalf of this device are
 441  * freed.
 442  */
 443 static int dwc2_driver_remove(struct platform_device *dev)
 444 {
 445         struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
 446
 447         dwc2_debugfs_exit(hsotg);
 448         if (hsotg->hcd_enabled)
 449                 dwc2_hcd_remove(hsotg);
 450         if (hsotg->gadget_enabled)
 451                 dwc2_hsotg_remove(hsotg);
 452
 453         if (hsotg->ll_hw_enabled)
 454                 dwc2_lowlevel_hw_disable(hsotg);
 455
 456         if (hsotg->reset)
 457                 reset_control_assert(hsotg->reset);
 458
 459         return 0;
 460 }
 461
 462 /**
 463  * dwc2_driver_shutdown() - Called on device shutdown
 464  *
 465  * @dev: Platform device
 466  *
 467  * In specific conditions (involving usb hubs) dwc2 devices can create a
 468  * lot of interrupts, even to the point of overwhelming devices running
 469  * at low frequencies. Some devices need to do special clock handling
 470  * at shutdown-time which may bring the system clock below the threshold
 471  * of being able to handle the dwc2 interrupts. Disabling dwc2-irqs
 472  * prevents reboots/poweroffs from getting stuck in such cases.
 473  */
 474 static void dwc2_driver_shutdown(struct platform_device *dev)
 475 {
 476         struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
 477
 478         disable_irq(hsotg->irq);
 479 }
 480
 481 static const struct of_device_id dwc2_of_match_table[] = {
 482         { .compatible = "brcm,bcm2835-usb", .data = &params_bcm2835 },
 483         { .compatible = "hisilicon,hi6220-usb", .data = &params_hi6220 },
 484         { .compatible = "rockchip,rk3066-usb", .data = &params_rk3066 },
 485         { .compatible = "lantiq,arx100-usb", .data = &params_ltq },
 486         { .compatible = "lantiq,xrx200-usb", .data = &params_ltq },
 487         { .compatible = "snps,dwc2", .data = NULL },
 488         { .compatible = "samsung,s3c6400-hsotg", .data = NULL},
 489         {},
 490 };
 491 MODULE_DEVICE_TABLE(of, dwc2_of_match_table);
 492
 493 /**
 494  * dwc2_driver_probe() - Called when the DWC_otg core is bound to the DWC_otg
 495  * driver
 496  *
 497  * @dev: Platform device
 498  *
 499  * This routine creates the driver components required to control the device
 500  * (core, HCD, and PCD) and initializes the device. The driver components are
 501  * stored in a dwc2_hsotg structure. A reference to the dwc2_hsotg is saved
 502  * in the device private data. This allows the driver to access the dwc2_hsotg
 503  * structure on subsequent calls to driver methods for this device.
 504  */
 505 static int dwc2_driver_probe(struct platform_device *dev)
 506 {
 507         const struct of_device_id *match;
 508         const struct dwc2_core_params *params;
 509         struct dwc2_core_params defparams;
 510         struct dwc2_hsotg *hsotg;
 511         struct resource *res;
 512         int retval;
 513
 514         match = of_match_device(dwc2_of_match_table, &dev->dev);
 515         if (match && match->data) {
 516                 params = match->data;
 517         } else {
 518                 /* Default all params to autodetect */
 519                 dwc2_set_all_params(&defparams, -1);
 520                 params = &defparams;
 521
 522                 /*
 523                  * Disable descriptor dma mode by default as the HW can support
 524                  * it, but does not support it for SPLIT transactions.
 525                  * Disable it for FS devices as well.
 526                  */
 527                 defparams.dma_desc_enable = 0;
 528                 defparams.dma_desc_fs_enable = 0;
 529         }
 530
 531         hsotg = devm_kzalloc(&dev->dev, sizeof(*hsotg), GFP_KERNEL);
 532         if (!hsotg)
 533                 return -ENOMEM;
 534
 535         hsotg->dev = &dev->dev;
 536
 537         /*
 538          * Use reasonable defaults so platforms don't have to provide these.
 539          */
 540         if (!dev->dev.dma_mask)
 541                 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
 542         retval = dma_set_coherent_mask(&dev->dev, DMA_BIT_MASK(32));
 543         if (retval)
 544                 return retval;
 545
 546         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 547         hsotg->regs = devm_ioremap_resource(&dev->dev, res);
 548         if (IS_ERR(hsotg->regs))
 549                 return PTR_ERR(hsotg->regs);
 550
 551         dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
 552                 (unsigned long)res->start, hsotg->regs);
 553
 554         retval = dwc2_lowlevel_hw_init(hsotg);
 555         if (retval)
 556                 return retval;
 557
 558         spin_lock_init(&hsotg->lock);
 559
 560         hsotg->core_params = devm_kzalloc(&dev->dev,
 561                                 sizeof(*hsotg->core_params), GFP_KERNEL);
 562         if (!hsotg->core_params)
 563                 return -ENOMEM;
 564
 565         dwc2_set_all_params(hsotg->core_params, -1);
 566
 567         hsotg->irq = platform_get_irq(dev, 0);
 568         if (hsotg->irq < 0) {
 569                 dev_err(&dev->dev, "missing IRQ resource\n");
 570                 return hsotg->irq;
 571         }
 572
 573         dev_dbg(hsotg->dev, "registering common handler for irq%d\n",
 574                 hsotg->irq);
 575         retval = devm_request_irq(hsotg->dev, hsotg->irq,
 576                                   dwc2_handle_common_intr, IRQF_SHARED,
 577                                   dev_name(hsotg->dev), hsotg);
 578         if (retval)
 579                 return retval;
 580
 581         retval = dwc2_lowlevel_hw_enable(hsotg);
 582         if (retval)
 583                 return retval;
 584
 585         retval = dwc2_get_dr_mode(hsotg);
 586         if (retval)
 587                 goto error;
 588
 589         /*
 590          * Reset before dwc2_get_hwparams() then it could get power-on real
 591          * reset value form registers.
 592          */
 593         dwc2_core_reset_and_force_dr_mode(hsotg);
 594
 595         /* Detect config values from hardware */
 596         retval = dwc2_get_hwparams(hsotg);
 597         if (retval)
 598                 goto error;
 599
 600         /* Validate parameter values */
 601         dwc2_set_parameters(hsotg, params);
 602
 603         dwc2_force_dr_mode(hsotg);
 604
 605         if (hsotg->dr_mode != USB_DR_MODE_HOST) {
 606                 retval = dwc2_gadget_init(hsotg, hsotg->irq);
 607                 if (retval)
 608                         goto error;
 609                 hsotg->gadget_enabled = 1;
 610         }
 611
 612         if (hsotg->dr_mode != USB_DR_MODE_PERIPHERAL) {
 613                 retval = dwc2_hcd_init(hsotg, hsotg->irq);
 614                 if (retval) {
 615                         if (hsotg->gadget_enabled)
 616                                 dwc2_hsotg_remove(hsotg);
 617                         goto error;
 618                 }
 619                 hsotg->hcd_enabled = 1;
 620         }
 621
 622         platform_set_drvdata(dev, hsotg);
 623
 624         dwc2_debugfs_init(hsotg);
 625
 626         /* Gadget code manages lowlevel hw on its own */
 627         if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL)
 628                 dwc2_lowlevel_hw_disable(hsotg);
 629
 630         return 0;
 631
 632 error:
 633         dwc2_lowlevel_hw_disable(hsotg);
 634         return retval;
 635 }
 636
 637 static int __maybe_unused dwc2_suspend(struct device *dev)
 638 {
 639         struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev);
 640         int ret = 0;
 641
 642         if (dwc2_is_device_mode(dwc2))
 643                 dwc2_hsotg_suspend(dwc2);
 644
 645         if (dwc2->ll_hw_enabled)
 646                 ret = __dwc2_lowlevel_hw_disable(dwc2);
 647
 648         return ret;
 649 }
 650
 651 static int __maybe_unused dwc2_resume(struct device *dev)
 652 {
 653         struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev);
 654         int ret = 0;
 655
 656         if (dwc2->ll_hw_enabled) {
 657                 ret = __dwc2_lowlevel_hw_enable(dwc2);
 658                 if (ret)
 659                         return ret;
 660         }
 661
 662         if (dwc2_is_device_mode(dwc2))
 663                 ret = dwc2_hsotg_resume(dwc2);
 664
 665         return ret;
 666 }
 667
 668 static const struct dev_pm_ops dwc2_dev_pm_ops = {
 669         SET_SYSTEM_SLEEP_PM_OPS(dwc2_suspend, dwc2_resume)
 670 };
 671
 672 static struct platform_driver dwc2_platform_driver = {
 673         .driver = {
 674                 .name = dwc2_driver_name,
 675                 .of_match_table = dwc2_of_match_table,
 676                 .pm = &dwc2_dev_pm_ops,
 677         },
 678         .probe = dwc2_driver_probe,
 679         .remove = dwc2_driver_remove,
 680         .shutdown = dwc2_driver_shutdown,
 681 };
 682
 683 module_platform_driver(dwc2_platform_driver);
 684
 685 MODULE_DESCRIPTION("DESIGNWARE HS OTG Platform Glue");
 686 MODULE_AUTHOR("Matthijs Kooijman <matthijs@stdin.nl>");
 687 MODULE_LICENSE("Dual BSD/GPL");