drivers/usb/dwc_otg_310/usbdev_rk3126.c

   1 #include "usbdev_rk.h"
   2 #include "usbdev_grf_regs.h"
   3 #include "dwc_otg_regs.h"
   4 static struct dwc_otg_control_usb *control_usb;
   5
   6 #ifdef CONFIG_USB20_OTG
   7 static void usb20otg_hw_init(void)
   8 {
   9         /* Turn off differential receiver in suspend mode */
  10         writel(UOC_HIWORD_UPDATE(0, 1, 2),
  11                    RK_GRF_VIRT + RK312X_GRF_USBPHY0_CON6);
  12         /* other haredware init,include:
  13          * DRV_VBUS GPIO init */
  14         if (gpio_is_valid(control_usb->otg_gpios->gpio)) {
  15                 if (gpio_get_value(control_usb->otg_gpios->gpio))
  16                         gpio_set_value(control_usb->otg_gpios->gpio, 0);
  17         }
  18 }
  19
  20 static void usb20otg_phy_suspend(void *pdata, int suspend)
  21 {
  22         struct dwc_otg_platform_data *usbpdata = pdata;
  23         if (suspend) {
  24                 /* enable soft control */
  25                 writel(UOC_HIWORD_UPDATE(0x55, 0x7f, 0),
  26                        RK_GRF_VIRT + RK312X_GRF_UOC0_CON0);
  27                 usbpdata->phy_status = 1;
  28         } else {
  29                 /* exit suspend */
  30                 writel(UOC_HIWORD_UPDATE(0x0, 0x1, 0),
  31                        RK_GRF_VIRT + RK312X_GRF_UOC0_CON0);
  32                 usbpdata->phy_status = 0;
  33         }
  34 }
  35
  36 static void usb20otg_soft_reset(void *pdata, enum rkusb_rst_flag rst_type)
  37 {
  38         struct dwc_otg_platform_data *usbpdata = pdata;
  39         struct reset_control *rst_otg_h, *rst_otg_p, *rst_otg_c;
  40
  41         rst_otg_h = devm_reset_control_get(usbpdata->dev, "otg_ahb");
  42         rst_otg_p = devm_reset_control_get(usbpdata->dev, "otg_phy");
  43         rst_otg_c = devm_reset_control_get(usbpdata->dev, "otg_controller");
  44         if (IS_ERR(rst_otg_h) || IS_ERR(rst_otg_p) || IS_ERR(rst_otg_c)) {
  45                 dev_err(usbpdata->dev, "Fail to get reset control from dts\n");
  46                 return;
  47         }
  48
  49         switch(rst_type) {
  50         case RST_POR:
  51                 /* PHY reset */
  52                 writel(UOC_HIWORD_UPDATE(0x1, 0x3, 0),
  53                            RK_GRF_VIRT + RK312X_GRF_UOC0_CON0);
  54                 reset_control_assert(rst_otg_p);
  55                 udelay(15);
  56                 writel(UOC_HIWORD_UPDATE(0x2, 0x3, 0),
  57                            RK_GRF_VIRT + RK312X_GRF_UOC0_CON0);
  58                 udelay(1500);
  59                 reset_control_deassert(rst_otg_p);
  60                 udelay(2);
  61
  62                 /* Controller reset */
  63                 reset_control_assert(rst_otg_c);
  64                 reset_control_assert(rst_otg_h);
  65
  66                 udelay(2);
  67
  68                 reset_control_deassert(rst_otg_c);
  69                 reset_control_deassert(rst_otg_h);
  70                 break;
  71
  72         default:
  73                 break;
  74         }
  75 }
  76
  77 static void usb20otg_clock_init(void *pdata)
  78 {
  79         struct dwc_otg_platform_data *usbpdata = pdata;
  80         struct clk *ahbclk, *phyclk;
  81
  82         ahbclk = devm_clk_get(usbpdata->dev, "hclk_usb0");
  83         if (IS_ERR(ahbclk)) {
  84                 dev_err(usbpdata->dev, "Failed to get hclk_usb0\n");
  85                 return;
  86         }
  87
  88         phyclk = devm_clk_get(usbpdata->dev, "clk_usbphy0");
  89         if (IS_ERR(phyclk)) {
  90                 dev_err(usbpdata->dev, "Failed to get clk_usbphy0\n");
  91                 return;
  92         }
  93
  94         usbpdata->phyclk = phyclk;
  95         usbpdata->ahbclk = ahbclk;
  96 }
  97
  98 static void usb20otg_clock_enable(void *pdata, int enable)
  99 {
 100         struct dwc_otg_platform_data *usbpdata = pdata;
 101
 102         if (enable) {
 103                 clk_prepare_enable(usbpdata->ahbclk);
 104                 clk_prepare_enable(usbpdata->phyclk);
 105         } else {
 106                 clk_disable_unprepare(usbpdata->ahbclk);
 107                 /*
 108                    clk_disable_unprepare(usbpdata->phyclk);
 109                  */
 110         }
 111 }
 112
 113 static int usb20otg_get_status(int id)
 114 {
 115         int ret = -1;
 116         u32 soc_status0 = readl(RK_GRF_VIRT + RK312X_GRF_SOC_STATUS0);
 117         switch (id) {
 118         case USB_STATUS_BVABLID:
 119                 /* bvalid in grf */
 120                 ret = soc_status0 & (0x1 << 5);
 121                 break;
 122         case USB_STATUS_DPDM:
 123                 /* dpdm in grf */
 124                 ret = soc_status0 & (0x3 << 6);
 125                 break;
 126         case USB_STATUS_ID:
 127                 /* id in grf */
 128                 ret = soc_status0 & (0x1 << 8);
 129                 break;
 130         case USB_STATUS_UARTMODE:
 131                 ret = readl(RK_GRF_VIRT + RK312X_GRF_UOC1_CON4) & (1 << 12);
 132                 break;
 133         case USB_CHIP_ID:
 134                 ret = control_usb->chip_id;
 135                 break;
 136         case USB_REMOTE_WAKEUP:
 137                 ret = control_usb->remote_wakeup;
 138                 break;
 139         case USB_IRQ_WAKEUP:
 140                 ret = control_usb->usb_irq_wakeup;
 141                 break;
 142         default:
 143                 break;
 144         }
 145         return ret;
 146 }
 147
 148 #ifdef CONFIG_RK_USB_UART
 149 /**
 150  *  dwc_otg_uart_enabled - check if a usb-uart bypass func is enabled in DT
 151  *
 152  *  Returns true if the status property of node "usb_uart" is set to "okay"
 153  *  or "ok", if this property is absent it will use the default status "ok"
 154  *  0 otherwise
 155  */
 156 static bool dwc_otg_uart_enabled(void)
 157 {
 158         struct device_node *np;
 159
 160         np = of_find_node_by_name(NULL, "usb_uart");
 161         if (np && of_device_is_available(np))
 162                 return true;
 163
 164         return false;
 165 }
 166
 167 static void dwc_otg_uart_mode(void *pdata, int enter_usb_uart_mode)
 168 {
 169         if ((1 == enter_usb_uart_mode) && dwc_otg_uart_enabled()) {
 170                 /* bypass dm, enter uart mode */
 171                 writel(UOC_HIWORD_UPDATE(0x3, 0x3, 12), RK_GRF_VIRT +
 172                            RK312X_GRF_UOC1_CON4);
 173
 174         } else if (0 == enter_usb_uart_mode) {
 175                 /* enter usb mode */
 176                 writel(UOC_HIWORD_UPDATE(0x0, 0x3, 12), RK_GRF_VIRT +
 177                            RK312X_GRF_UOC1_CON4);
 178         }
 179 }
 180 #else
 181 static void dwc_otg_uart_mode(void *pdata, int enter_usb_uart_mode)
 182 {
 183 }
 184 #endif
 185
 186 static void usb20otg_power_enable(int enable)
 187 {
 188         if (0 == enable) {
 189                 /* disable otg_drv power */
 190                 if (gpio_is_valid(control_usb->otg_gpios->gpio))
 191                         gpio_set_value(control_usb->otg_gpios->gpio, 0);
 192         } else if (1 == enable) {
 193                 /* enable otg_drv power */
 194                 if (gpio_is_valid(control_usb->otg_gpios->gpio))
 195                         gpio_set_value(control_usb->otg_gpios->gpio, 1);
 196         }
 197 }
 198
 199 struct dwc_otg_platform_data usb20otg_pdata_rk3126 = {
 200         .phyclk = NULL,
 201         .ahbclk = NULL,
 202         .busclk = NULL,
 203         .phy_status = 0,
 204         .hw_init = usb20otg_hw_init,
 205         .phy_suspend = usb20otg_phy_suspend,
 206         .soft_reset = usb20otg_soft_reset,
 207         .clock_init = usb20otg_clock_init,
 208         .clock_enable = usb20otg_clock_enable,
 209         .get_status = usb20otg_get_status,
 210         .power_enable = usb20otg_power_enable,
 211         .dwc_otg_uart_mode = dwc_otg_uart_mode,
 212         .bc_detect_cb = rk_battery_charger_detect_cb,
 213 };
 214 #endif
 215
 216 #ifdef CONFIG_USB20_HOST
 217 static void usb20host_hw_init(void)
 218 {
 219         /* Turn off differential receiver in suspend mode */
 220         writel(UOC_HIWORD_UPDATE(0, 1, 2),
 221                    RK_GRF_VIRT + RK312X_GRF_USBPHY1_CON6);
 222         /* Set disconnect detection trigger point to 600mv */
 223         writel(UOC_HIWORD_UPDATE(1, 0xf, 11),
 224                    RK_GRF_VIRT + RK312X_GRF_USBPHY1_CON7);
 225         /* other haredware init,include:
 226          * DRV_VBUS GPIO init */
 227         if (gpio_is_valid(control_usb->host_gpios->gpio)) {
 228                 if (!gpio_get_value(control_usb->host_gpios->gpio))
 229                         gpio_set_value(control_usb->host_gpios->gpio, 1);
 230         }
 231 }
 232
 233 static void usb20host_phy_suspend(void *pdata, int suspend)
 234 {
 235         struct dwc_otg_platform_data *usbpdata = pdata;
 236
 237         if (suspend) {
 238                 /* enable soft control */
 239                 writel(UOC_HIWORD_UPDATE(0x1d5, 0x1ff, 0),
 240                        RK_GRF_VIRT + RK312X_GRF_UOC1_CON5);
 241                 usbpdata->phy_status = 1;
 242         } else {
 243                 /* exit suspend */
 244                 writel(UOC_HIWORD_UPDATE(0x0, 0x1, 0),
 245                        RK_GRF_VIRT + RK312X_GRF_UOC1_CON5);
 246                 usbpdata->phy_status = 0;
 247         }
 248 }
 249
 250 static void usb20host_soft_reset(void *pdata, enum rkusb_rst_flag rst_type)
 251 {
 252         struct dwc_otg_platform_data *usbpdata = pdata;
 253         struct reset_control *rst_host_h, *rst_host_p, *rst_host_c;
 254
 255         rst_host_h = devm_reset_control_get(usbpdata->dev, "host_ahb");
 256         rst_host_p = devm_reset_control_get(usbpdata->dev, "host_phy");
 257         rst_host_c = devm_reset_control_get(usbpdata->dev, "host_controller");
 258         if (IS_ERR(rst_host_h) || IS_ERR(rst_host_p) || IS_ERR(rst_host_c)) {
 259                 dev_err(usbpdata->dev, "Fail to get reset control from dts\n");
 260                 return;
 261         }
 262
 263         switch(rst_type) {
 264         case RST_POR:
 265                 /* PHY reset */
 266                 writel(UOC_HIWORD_UPDATE(0x1, 0x3, 0),
 267                            RK_GRF_VIRT + RK312X_GRF_UOC1_CON5);
 268                 reset_control_assert(rst_host_p);
 269                 udelay(15);
 270                 writel(UOC_HIWORD_UPDATE(0x2, 0x3, 0),
 271                            RK_GRF_VIRT + RK312X_GRF_UOC1_CON5);
 272
 273                 udelay(1500);
 274                 reset_control_deassert(rst_host_p);
 275
 276                 /* Controller reset */
 277                 reset_control_assert(rst_host_c);
 278                 reset_control_assert(rst_host_h);
 279
 280                 udelay(5);
 281
 282                 reset_control_deassert(rst_host_c);
 283                 reset_control_deassert(rst_host_h);
 284                 break;
 285
 286         default:
 287                 break;
 288         }
 289 }
 290
 291 static void usb20host_clock_init(void *pdata)
 292 {
 293         struct dwc_otg_platform_data *usbpdata = pdata;
 294         struct clk *ahbclk, *phyclk;
 295
 296         ahbclk = devm_clk_get(usbpdata->dev, "hclk_usb1");
 297         if (IS_ERR(ahbclk)) {
 298                 dev_err(usbpdata->dev, "Failed to get hclk_usb1\n");
 299                 return;
 300         }
 301
 302         phyclk = devm_clk_get(usbpdata->dev, "clk_usbphy1");
 303         if (IS_ERR(phyclk)) {
 304                 dev_err(usbpdata->dev, "Failed to get clk_usbphy1\n");
 305                 return;
 306         }
 307
 308         usbpdata->phyclk = phyclk;
 309         usbpdata->ahbclk = ahbclk;
 310 }
 311
 312 static void usb20host_clock_enable(void *pdata, int enable)
 313 {
 314         struct dwc_otg_platform_data *usbpdata = pdata;
 315
 316         if (enable) {
 317                 clk_prepare_enable(usbpdata->ahbclk);
 318                 clk_prepare_enable(usbpdata->phyclk);
 319         } else {
 320                 clk_disable_unprepare(usbpdata->ahbclk);
 321                 clk_disable_unprepare(usbpdata->phyclk);
 322         }
 323 }
 324
 325 static int usb20host_get_status(int id)
 326 {
 327         int ret = -1;
 328         u32 soc_status0 = readl(RK_GRF_VIRT + RK312X_GRF_SOC_STATUS0);
 329
 330         switch (id) {
 331         case USB_STATUS_BVABLID:
 332                 /* bvalid in grf */
 333                 ret = soc_status0 & (0x1 << 10);
 334                 break;
 335         case USB_STATUS_DPDM:
 336                 /* dpdm in grf */
 337                 ret = soc_status0 & (0x3 << 11);
 338                 break;
 339         case USB_STATUS_ID:
 340                 /* id in grf */
 341                 ret = 0;
 342                 break;
 343         case USB_CHIP_ID:
 344                 ret = control_usb->chip_id;
 345                 break;
 346         case USB_REMOTE_WAKEUP:
 347                 ret = control_usb->remote_wakeup;
 348                 break;
 349         case USB_IRQ_WAKEUP:
 350                 ret = control_usb->usb_irq_wakeup;
 351                 break;
 352         default:
 353                 break;
 354         }
 355         return ret;
 356 }
 357
 358 static void usb20host_power_enable(int enable)
 359 {
 360         if (0 == enable) {
 361                 /* disable host_drv power */
 362                 /* do not disable power in default */
 363         } else if (1 == enable) {
 364                 /* enable host_drv power */
 365                 if (gpio_is_valid(control_usb->host_gpios->gpio))
 366                         gpio_set_value(control_usb->host_gpios->gpio, 1);
 367         }
 368 }
 369
 370 struct dwc_otg_platform_data usb20host_pdata_rk3126 = {
 371         .phyclk = NULL,
 372         .ahbclk = NULL,
 373         .busclk = NULL,
 374         .phy_status = 0,
 375         .hw_init = usb20host_hw_init,
 376         .phy_suspend = usb20host_phy_suspend,
 377         .soft_reset = usb20host_soft_reset,
 378         .clock_init = usb20host_clock_init,
 379         .clock_enable = usb20host_clock_enable,
 380         .get_status = usb20host_get_status,
 381         .power_enable = usb20host_power_enable,
 382 };
 383 #endif
 384
 385 #ifdef CONFIG_OF
 386 static const struct of_device_id rk_usb_control_id_table[] = {
 387         {
 388          .compatible = "rockchip,rk3126-usb-control",
 389          },
 390         {},
 391 };
 392 #endif
 393 /*********************************************************************
 394                         rk3126 usb detections
 395 *********************************************************************/
 396
 397 #define WAKE_LOCK_TIMEOUT (HZ * 10)
 398 static inline void do_wakeup(struct work_struct *work)
 399 {
 400         /* wake up the system */
 401         rk_send_wakeup_key();
 402 }
 403
 404 static void usb_battery_charger_detect_work(struct work_struct *work)
 405 {
 406         rk_battery_charger_detect_cb(usb_battery_charger_detect(1));
 407 }
 408
 409 /********** handler for bvalid irq **********/
 410 static irqreturn_t bvalid_irq_handler(int irq, void *dev_id)
 411 {
 412         /* clear irq */
 413         writel(UOC_HIWORD_UPDATE(0x1, 0x1, 15),
 414                RK_GRF_VIRT + RK312X_GRF_UOC0_CON0);
 415 #ifdef CONFIG_RK_USB_UART
 416         /* usb otg dp/dm switch to usb phy */
 417         dwc_otg_uart_mode(NULL, PHY_USB_MODE);
 418 #endif
 419
 420         if (control_usb->usb_irq_wakeup) {
 421                 wake_lock_timeout(&control_usb->usb_wakelock,
 422                                   WAKE_LOCK_TIMEOUT);
 423                 schedule_delayed_work(&control_usb->usb_det_wakeup_work,
 424                                       HZ / 10);
 425         }
 426
 427         schedule_delayed_work(&control_usb->usb_charger_det_work, HZ / 10);
 428
 429         return IRQ_HANDLED;
 430 }
 431
 432 /************* register usb detection irqs **************/
 433 static int otg_irq_detect_init(struct platform_device *pdev)
 434 {
 435         int ret = 0;
 436         int irq = 0;
 437
 438         if (control_usb->usb_irq_wakeup) {
 439                 wake_lock_init(&control_usb->usb_wakelock, WAKE_LOCK_SUSPEND,
 440                                "usb_detect");
 441                 INIT_DELAYED_WORK(&control_usb->usb_det_wakeup_work, do_wakeup);
 442         }
 443
 444         /*register otg_bvalid irq */
 445         irq = platform_get_irq_byname(pdev, "otg_bvalid");
 446         if ((irq > 0) && control_usb->usb_irq_wakeup) {
 447                 ret = request_irq(irq, bvalid_irq_handler,
 448                                   0, "otg_bvalid", NULL);
 449                 if (ret < 0) {
 450                         dev_err(&pdev->dev, "request_irq %d failed!\n", irq);
 451                 } else {
 452                         /* enable bvalid irq  */
 453                         writel(UOC_HIWORD_UPDATE(0x1, 0x1, 14),
 454                                RK_GRF_VIRT + RK312X_GRF_UOC0_CON0);
 455                 }
 456         }
 457         return ret;
 458 }
 459
 460 /********** end of rk3126 usb detections **********/
 461 static int rk_usb_control_probe(struct platform_device *pdev)
 462 {
 463         int gpio, err;
 464         struct device_node *np = pdev->dev.of_node;
 465         int ret = 0;
 466
 467         control_usb =
 468             devm_kzalloc(&pdev->dev, sizeof(*control_usb), GFP_KERNEL);
 469         if (!control_usb) {
 470                 dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
 471                 ret = -ENOMEM;
 472                 goto out;
 473         }
 474
 475         control_usb->chip_id = RK3126_USB_CTLR;
 476         control_usb->remote_wakeup = of_property_read_bool(np,
 477                                                            "rockchip,remote_wakeup");
 478         control_usb->usb_irq_wakeup = of_property_read_bool(np,
 479                                                             "rockchip,usb_irq_wakeup");
 480
 481         INIT_DELAYED_WORK(&control_usb->usb_charger_det_work,
 482                           usb_battery_charger_detect_work);
 483
 484         control_usb->host_gpios =
 485             devm_kzalloc(&pdev->dev, sizeof(struct gpio), GFP_KERNEL);
 486         if (!control_usb->host_gpios) {
 487                 dev_err(&pdev->dev, "unable to alloc memory for host_gpios\n");
 488                 ret = -ENOMEM;
 489                 goto out;
 490         }
 491
 492         gpio = of_get_named_gpio(np, "host_drv_gpio", 0);
 493         control_usb->host_gpios->gpio = gpio;
 494
 495         if (!gpio_is_valid(gpio)) {
 496                 dev_err(&pdev->dev, "invalid host gpio%d\n", gpio);
 497         } else {
 498                 err = devm_gpio_request(&pdev->dev, gpio, "host_drv_gpio");
 499                 if (err) {
 500                         dev_err(&pdev->dev,
 501                                 "failed to request GPIO%d for host_drv\n",
 502                                 gpio);
 503                         ret = err;
 504                         goto out;
 505                 }
 506                 gpio_direction_output(control_usb->host_gpios->gpio, 1);
 507         }
 508
 509         control_usb->otg_gpios =
 510             devm_kzalloc(&pdev->dev, sizeof(struct gpio), GFP_KERNEL);
 511         if (!control_usb->otg_gpios) {
 512                 dev_err(&pdev->dev, "unable to alloc memory for otg_gpios\n");
 513                 ret = -ENOMEM;
 514                 goto out;
 515         }
 516
 517         gpio = of_get_named_gpio(np, "otg_drv_gpio", 0);
 518         control_usb->otg_gpios->gpio = gpio;
 519
 520         if (!gpio_is_valid(gpio)) {
 521                 dev_err(&pdev->dev, "invalid otg gpio%d\n", gpio);
 522         } else {
 523                 err = devm_gpio_request(&pdev->dev, gpio, "otg_drv_gpio");
 524                 if (err) {
 525                         dev_err(&pdev->dev,
 526                                 "failed to request GPIO%d for otg_drv\n", gpio);
 527                         ret = err;
 528                         goto out;
 529                 }
 530                 gpio_direction_output(control_usb->otg_gpios->gpio, 0);
 531         }
 532
 533 out:
 534         return ret;
 535 }
 536
 537 static int rk_usb_control_remove(struct platform_device *pdev)
 538 {
 539         return 0;
 540 }
 541
 542 static struct platform_driver rk_usb_control_driver = {
 543         .probe = rk_usb_control_probe,
 544         .remove = rk_usb_control_remove,
 545         .driver = {
 546                    .name = "rk3126-usb-control",
 547                    .owner = THIS_MODULE,
 548                    .of_match_table = of_match_ptr(rk_usb_control_id_table),
 549                    },
 550 };
 551
 552 #ifdef CONFIG_OF
 553
 554 static const struct of_device_id dwc_otg_control_usb_id_table[] = {
 555         {
 556          .compatible = "rockchip,rk3126-dwc-control-usb",
 557          },
 558         {},
 559 };
 560
 561 #endif
 562 static int dwc_otg_control_usb_probe(struct platform_device *pdev)
 563 {
 564         struct clk *hclk_usb_peri;
 565         int ret = 0;
 566
 567         if (!control_usb) {
 568                 dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
 569                 ret = -ENOMEM;
 570                 goto err1;
 571         }
 572
 573         hclk_usb_peri = devm_clk_get(&pdev->dev, "hclk_usb_peri");
 574         if (IS_ERR(hclk_usb_peri)) {
 575                 dev_err(&pdev->dev, "Failed to get hclk_usb_peri\n");
 576                 ret = -EINVAL;
 577                 goto err1;
 578         }
 579
 580         control_usb->hclk_usb_peri = hclk_usb_peri;
 581         clk_prepare_enable(hclk_usb_peri);
 582
 583 #ifdef CONFIG_USB20_OTG
 584         if (usb20otg_get_status(USB_STATUS_BVABLID))
 585                 schedule_delayed_work(&control_usb->usb_charger_det_work,
 586                                       HZ / 10);
 587 #endif
 588
 589         ret = otg_irq_detect_init(pdev);
 590         if (ret < 0)
 591                 goto err2;
 592
 593         return 0;
 594
 595 err2:
 596         clk_disable_unprepare(hclk_usb_peri);
 597 err1:
 598         return ret;
 599 }
 600
 601 static int dwc_otg_control_usb_remove(struct platform_device *pdev)
 602 {
 603         clk_disable_unprepare(control_usb->hclk_usb_peri);
 604         return 0;
 605 }
 606
 607 static struct platform_driver dwc_otg_control_usb_driver = {
 608         .probe = dwc_otg_control_usb_probe,
 609         .remove = dwc_otg_control_usb_remove,
 610         .driver = {
 611                    .name = "rk3126-dwc-control-usb",
 612                    .owner = THIS_MODULE,
 613                    .of_match_table = of_match_ptr(dwc_otg_control_usb_id_table),
 614                    },
 615 };
 616
 617 static int __init dwc_otg_control_usb_init(void)
 618 {
 619         int retval = 0;
 620
 621         retval |= platform_driver_register(&rk_usb_control_driver);
 622         retval |= platform_driver_register(&dwc_otg_control_usb_driver);
 623         return retval;
 624 }
 625
 626 subsys_initcall(dwc_otg_control_usb_init);
 627
 628 static void __exit dwc_otg_control_usb_exit(void)
 629 {
 630         platform_driver_unregister(&rk_usb_control_driver);
 631         platform_driver_unregister(&dwc_otg_control_usb_driver);
 632 }
 633
 634 module_exit(dwc_otg_control_usb_exit);
 635 MODULE_ALIAS("platform: dwc_control_usb");
 636 MODULE_AUTHOR("RockChip Inc.");
 637 MODULE_DESCRIPTION("RockChip Control Module USB Driver");
 638 MODULE_LICENSE("GPL v2");
 639