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_USBPHY1_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_CHIP_ID:
 131                 ret = control_usb->chip_id;
 132                 break;
 133         case USB_REMOTE_WAKEUP:
 134                 ret = control_usb->remote_wakeup;
 135                 break;
 136         case USB_IRQ_WAKEUP:
 137                 ret = control_usb->usb_irq_wakeup;
 138                 break;
 139         default:
 140                 break;
 141         }
 142         return ret;
 143 }
 144
 145 #ifdef CONFIG_RK_USB_UART
 146 /**
 147  *  dwc_otg_uart_enabled - check if a usb-uart bypass func is enabled in DT
 148  *
 149  *  Returns true if the status property of node "usb_uart" is set to "okay"
 150  *  or "ok", if this property is absent it will use the default status "ok"
 151  *  0 otherwise
 152  */
 153 static bool dwc_otg_uart_enabled(void)
 154 {
 155         struct device_node *np;
 156
 157         np = of_find_node_by_name(NULL, "usb_uart");
 158         if (np && of_device_is_available(np))
 159                 return true;
 160
 161         return false;
 162 }
 163
 164 static void dwc_otg_uart_mode(void *pdata, int enter_usb_uart_mode)
 165 {
 166         if ((1 == enter_usb_uart_mode) && dwc_otg_uart_enabled()) {
 167                 /* bypass dm, enter uart mode */
 168                 writel(UOC_HIWORD_UPDATE(0x3, 0x3, 12), RK_GRF_VIRT +
 169                            RK312X_GRF_UOC1_CON4);
 170
 171         } else if (0 == enter_usb_uart_mode) {
 172                 /* enter usb mode */
 173                 writel(UOC_HIWORD_UPDATE(0x0, 0x3, 12), RK_GRF_VIRT +
 174                            RK312X_GRF_UOC1_CON4);
 175         }
 176 }
 177 #else
 178 static void dwc_otg_uart_mode(void *pdata, int enter_usb_uart_mode)
 179 {
 180 }
 181 #endif
 182
 183 static void usb20otg_power_enable(int enable)
 184 {
 185         if (0 == enable) {
 186                 /* disable otg_drv power */
 187                 if (gpio_is_valid(control_usb->otg_gpios->gpio))
 188                         gpio_set_value(control_usb->otg_gpios->gpio, 0);
 189         } else if (1 == enable) {
 190                 /* enable otg_drv power */
 191                 if (gpio_is_valid(control_usb->otg_gpios->gpio))
 192                         gpio_set_value(control_usb->otg_gpios->gpio, 1);
 193         }
 194 }
 195
 196 struct dwc_otg_platform_data usb20otg_pdata_rk3126 = {
 197         .phyclk = NULL,
 198         .ahbclk = NULL,
 199         .busclk = NULL,
 200         .phy_status = 0,
 201         .hw_init = usb20otg_hw_init,
 202         .phy_suspend = usb20otg_phy_suspend,
 203         .soft_reset = usb20otg_soft_reset,
 204         .clock_init = usb20otg_clock_init,
 205         .clock_enable = usb20otg_clock_enable,
 206         .get_status = usb20otg_get_status,
 207         .power_enable = usb20otg_power_enable,
 208         .dwc_otg_uart_mode = dwc_otg_uart_mode,
 209         .bc_detect_cb = rk_battery_charger_detect_cb,
 210 };
 211 #endif
 212
 213 #ifdef CONFIG_USB20_HOST
 214 static void usb20host_hw_init(void)
 215 {
 216         /* Switch to DWC HOST */
 217         writel(UOC_HIWORD_UPDATE(1, 1, 3),
 218                    RK_GRF_VIRT + RK312X_GRF_SOC_CON2);
 219         /* Turn off differential receiver in suspend mode */
 220         writel(UOC_HIWORD_UPDATE(0, 1, 2),
 221                    RK_GRF_VIRT + RK312X_GRF_USBPHY0_CON6);
 222         /* other haredware init,include:
 223          * DRV_VBUS GPIO init */
 224         if (gpio_is_valid(control_usb->host_gpios->gpio)) {
 225                 if (!gpio_get_value(control_usb->host_gpios->gpio))
 226                         gpio_set_value(control_usb->host_gpios->gpio, 1);
 227         }
 228 }
 229
 230 static void usb20host_phy_suspend(void *pdata, int suspend)
 231 {
 232         struct dwc_otg_platform_data *usbpdata = pdata;
 233
 234         if (suspend) {
 235                 /* enable soft control */
 236                 writel(UOC_HIWORD_UPDATE(0x1d5, 0x1ff, 0),
 237                        RK_GRF_VIRT + RK312X_GRF_UOC1_CON5);
 238                 usbpdata->phy_status = 1;
 239         } else {
 240                 /* exit suspend */
 241                 writel(UOC_HIWORD_UPDATE(0x0, 0x1, 0),
 242                        RK_GRF_VIRT + RK312X_GRF_UOC1_CON5);
 243                 usbpdata->phy_status = 0;
 244         }
 245 }
 246
 247 static void usb20host_soft_reset(void *pdata, enum rkusb_rst_flag rst_type)
 248 {
 249         struct dwc_otg_platform_data *usbpdata = pdata;
 250         struct reset_control *rst_host_h, *rst_host_p, *rst_host_c;
 251
 252         rst_host_h = devm_reset_control_get(usbpdata->dev, "host_ahb");
 253         rst_host_p = devm_reset_control_get(usbpdata->dev, "host_phy");
 254         rst_host_c = devm_reset_control_get(usbpdata->dev, "host_controller");
 255         if (IS_ERR(rst_host_h) || IS_ERR(rst_host_p) || IS_ERR(rst_host_c)) {
 256                 dev_err(usbpdata->dev, "Fail to get reset control from dts\n");
 257                 return;
 258         }
 259
 260         switch(rst_type) {
 261         case RST_POR:
 262                 /* PHY reset */
 263                 writel(UOC_HIWORD_UPDATE(0x1, 0x3, 0),
 264                            RK_GRF_VIRT + RK312X_GRF_UOC1_CON5);
 265                 reset_control_assert(rst_host_p);
 266                 udelay(15);
 267                 writel(UOC_HIWORD_UPDATE(0x2, 0x3, 0),
 268                            RK_GRF_VIRT + RK312X_GRF_UOC1_CON5);
 269
 270                 udelay(1500);
 271                 reset_control_deassert(rst_host_p);
 272
 273                 /* Controller reset */
 274                 reset_control_assert(rst_host_c);
 275                 reset_control_assert(rst_host_h);
 276
 277                 udelay(5);
 278
 279                 reset_control_deassert(rst_host_c);
 280                 reset_control_deassert(rst_host_h);
 281                 break;
 282
 283         default:
 284                 break;
 285         }
 286 }
 287
 288 static void usb20host_clock_init(void *pdata)
 289 {
 290         struct dwc_otg_platform_data *usbpdata = pdata;
 291         struct clk *ahbclk, *phyclk;
 292
 293         ahbclk = devm_clk_get(usbpdata->dev, "hclk_usb1");
 294         if (IS_ERR(ahbclk)) {
 295                 dev_err(usbpdata->dev, "Failed to get hclk_usb1\n");
 296                 return;
 297         }
 298
 299         phyclk = devm_clk_get(usbpdata->dev, "clk_usbphy1");
 300         if (IS_ERR(phyclk)) {
 301                 dev_err(usbpdata->dev, "Failed to get clk_usbphy1\n");
 302                 return;
 303         }
 304
 305         usbpdata->phyclk = phyclk;
 306         usbpdata->ahbclk = ahbclk;
 307 }
 308
 309 static void usb20host_clock_enable(void *pdata, int enable)
 310 {
 311         struct dwc_otg_platform_data *usbpdata = pdata;
 312
 313         if (enable) {
 314                 clk_prepare_enable(usbpdata->ahbclk);
 315                 clk_prepare_enable(usbpdata->phyclk);
 316         } else {
 317                 clk_disable_unprepare(usbpdata->ahbclk);
 318                 clk_disable_unprepare(usbpdata->phyclk);
 319         }
 320 }
 321
 322 static int usb20host_get_status(int id)
 323 {
 324         int ret = -1;
 325         u32 soc_status0 = readl(RK_GRF_VIRT + RK312X_GRF_SOC_STATUS0);
 326
 327         switch (id) {
 328         case USB_STATUS_BVABLID:
 329                 /* bvalid in grf */
 330                 ret = soc_status0 & (0x1 << 10);
 331                 break;
 332         case USB_STATUS_DPDM:
 333                 /* dpdm in grf */
 334                 ret = soc_status0 & (0x3 << 11);
 335                 break;
 336         case USB_STATUS_ID:
 337                 /* id in grf */
 338                 ret = 0;
 339                 break;
 340         case USB_CHIP_ID:
 341                 ret = control_usb->chip_id;
 342                 break;
 343         case USB_REMOTE_WAKEUP:
 344                 ret = control_usb->remote_wakeup;
 345                 break;
 346         case USB_IRQ_WAKEUP:
 347                 ret = control_usb->usb_irq_wakeup;
 348                 break;
 349         default:
 350                 break;
 351         }
 352         return ret;
 353 }
 354
 355 static void usb20host_power_enable(int enable)
 356 {
 357         if (0 == enable) {
 358                 /* disable host_drv power */
 359                 /* do not disable power in default */
 360         } else if (1 == enable) {
 361                 /* enable host_drv power */
 362                 if (gpio_is_valid(control_usb->host_gpios->gpio))
 363                         gpio_set_value(control_usb->host_gpios->gpio, 1);
 364         }
 365 }
 366
 367 struct dwc_otg_platform_data usb20host_pdata_rk3126 = {
 368         .phyclk = NULL,
 369         .ahbclk = NULL,
 370         .busclk = NULL,
 371         .phy_status = 0,
 372         .hw_init = usb20host_hw_init,
 373         .phy_suspend = usb20host_phy_suspend,
 374         .soft_reset = usb20host_soft_reset,
 375         .clock_init = usb20host_clock_init,
 376         .clock_enable = usb20host_clock_enable,
 377         .get_status = usb20host_get_status,
 378         .power_enable = usb20host_power_enable,
 379 };
 380 #endif
 381
 382 #ifdef CONFIG_OF
 383 static const struct of_device_id rk_usb_control_id_table[] = {
 384         {
 385          .compatible = "rockchip,rk3126-usb-control",
 386          },
 387         {},
 388 };
 389 #endif
 390 /*********************************************************************
 391                         rk3126 usb detections
 392 *********************************************************************/
 393
 394 #define WAKE_LOCK_TIMEOUT (HZ * 10)
 395 static inline void do_wakeup(struct work_struct *work)
 396 {
 397         /* wake up the system */
 398         rk_send_wakeup_key();
 399 }
 400
 401 static void usb_battery_charger_detect_work(struct work_struct *work)
 402 {
 403         rk_battery_charger_detect_cb(usb_battery_charger_detect(1));
 404 }
 405
 406 /********** handler for bvalid irq **********/
 407 static irqreturn_t bvalid_irq_handler(int irq, void *dev_id)
 408 {
 409         /* clear irq */
 410         writel(UOC_HIWORD_UPDATE(0x1, 0x1, 15),
 411                RK_GRF_VIRT + RK312X_GRF_UOC0_CON0);
 412 #ifdef CONFIG_RK_USB_UART
 413         /* usb otg dp/dm switch to usb phy */
 414         dwc_otg_uart_mode(NULL, PHY_USB_MODE);
 415 #endif
 416
 417         if (control_usb->usb_irq_wakeup) {
 418                 wake_lock_timeout(&control_usb->usb_wakelock,
 419                                   WAKE_LOCK_TIMEOUT);
 420                 schedule_delayed_work(&control_usb->usb_det_wakeup_work,
 421                                       HZ / 10);
 422         }
 423
 424         schedule_delayed_work(&control_usb->usb_charger_det_work, HZ / 10);
 425
 426         return IRQ_HANDLED;
 427 }
 428
 429 /************* register usb detection irqs **************/
 430 static int otg_irq_detect_init(struct platform_device *pdev)
 431 {
 432         int ret = 0;
 433         int irq = 0;
 434
 435         if (control_usb->usb_irq_wakeup) {
 436                 wake_lock_init(&control_usb->usb_wakelock, WAKE_LOCK_SUSPEND,
 437                                "usb_detect");
 438                 INIT_DELAYED_WORK(&control_usb->usb_det_wakeup_work, do_wakeup);
 439         }
 440
 441         /*register otg_bvalid irq */
 442         irq = platform_get_irq_byname(pdev, "otg_bvalid");
 443         if ((irq > 0) && control_usb->usb_irq_wakeup) {
 444                 ret = request_irq(irq, bvalid_irq_handler,
 445                                   0, "otg_bvalid", NULL);
 446                 if (ret < 0) {
 447                         dev_err(&pdev->dev, "request_irq %d failed!\n", irq);
 448                 } else {
 449                         /* enable bvalid irq  */
 450                         writel(UOC_HIWORD_UPDATE(0x1, 0x1, 14),
 451                                RK_GRF_VIRT + RK312X_GRF_UOC0_CON0);
 452                 }
 453         }
 454         return ret;
 455 }
 456
 457 /********** end of rk3126 usb detections **********/
 458 static int rk_usb_control_probe(struct platform_device *pdev)
 459 {
 460         int gpio, err;
 461         struct device_node *np = pdev->dev.of_node;
 462         int ret = 0;
 463
 464         control_usb =
 465             devm_kzalloc(&pdev->dev, sizeof(*control_usb), GFP_KERNEL);
 466         if (!control_usb) {
 467                 dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
 468                 ret = -ENOMEM;
 469                 goto out;
 470         }
 471
 472         control_usb->chip_id = RK3126_USB_CTLR;
 473         control_usb->remote_wakeup = of_property_read_bool(np,
 474                                                            "rockchip,remote_wakeup");
 475         control_usb->usb_irq_wakeup = of_property_read_bool(np,
 476                                                             "rockchip,usb_irq_wakeup");
 477
 478         INIT_DELAYED_WORK(&control_usb->usb_charger_det_work,
 479                           usb_battery_charger_detect_work);
 480
 481         control_usb->host_gpios =
 482             devm_kzalloc(&pdev->dev, sizeof(struct gpio), GFP_KERNEL);
 483         if (!control_usb->host_gpios) {
 484                 dev_err(&pdev->dev, "unable to alloc memory for host_gpios\n");
 485                 ret = -ENOMEM;
 486                 goto out;
 487         }
 488
 489         gpio = of_get_named_gpio(np, "host_drv_gpio", 0);
 490         control_usb->host_gpios->gpio = gpio;
 491
 492         if (!gpio_is_valid(gpio)) {
 493                 dev_err(&pdev->dev, "invalid host gpio%d\n", gpio);
 494         } else {
 495                 err = devm_gpio_request(&pdev->dev, gpio, "host_drv_gpio");
 496                 if (err) {
 497                         dev_err(&pdev->dev,
 498                                 "failed to request GPIO%d for host_drv\n",
 499                                 gpio);
 500                         ret = err;
 501                         goto out;
 502                 }
 503                 gpio_direction_output(control_usb->host_gpios->gpio, 1);
 504         }
 505
 506         control_usb->otg_gpios =
 507             devm_kzalloc(&pdev->dev, sizeof(struct gpio), GFP_KERNEL);
 508         if (!control_usb->otg_gpios) {
 509                 dev_err(&pdev->dev, "unable to alloc memory for otg_gpios\n");
 510                 ret = -ENOMEM;
 511                 goto out;
 512         }
 513
 514         gpio = of_get_named_gpio(np, "otg_drv_gpio", 0);
 515         control_usb->otg_gpios->gpio = gpio;
 516
 517         if (!gpio_is_valid(gpio)) {
 518                 dev_err(&pdev->dev, "invalid otg gpio%d\n", gpio);
 519         } else {
 520                 err = devm_gpio_request(&pdev->dev, gpio, "otg_drv_gpio");
 521                 if (err) {
 522                         dev_err(&pdev->dev,
 523                                 "failed to request GPIO%d for otg_drv\n", gpio);
 524                         ret = err;
 525                         goto out;
 526                 }
 527                 gpio_direction_output(control_usb->otg_gpios->gpio, 0);
 528         }
 529
 530 out:
 531         return ret;
 532 }
 533
 534 static int rk_usb_control_remove(struct platform_device *pdev)
 535 {
 536         return 0;
 537 }
 538
 539 static struct platform_driver rk_usb_control_driver = {
 540         .probe = rk_usb_control_probe,
 541         .remove = rk_usb_control_remove,
 542         .driver = {
 543                    .name = "rk3126-usb-control",
 544                    .owner = THIS_MODULE,
 545                    .of_match_table = of_match_ptr(rk_usb_control_id_table),
 546                    },
 547 };
 548
 549 #ifdef CONFIG_OF
 550
 551 static const struct of_device_id dwc_otg_control_usb_id_table[] = {
 552         {
 553          .compatible = "rockchip,rk3126-dwc-control-usb",
 554          },
 555         {},
 556 };
 557
 558 #endif
 559 static int dwc_otg_control_usb_probe(struct platform_device *pdev)
 560 {
 561         struct clk *hclk_usb_peri;
 562         int ret = 0;
 563
 564         if (!control_usb) {
 565                 dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
 566                 ret = -ENOMEM;
 567                 goto err1;
 568         }
 569
 570         hclk_usb_peri = devm_clk_get(&pdev->dev, "hclk_usb_peri");
 571         if (IS_ERR(hclk_usb_peri)) {
 572                 dev_err(&pdev->dev, "Failed to get hclk_usb_peri\n");
 573                 ret = -EINVAL;
 574                 goto err1;
 575         }
 576
 577         control_usb->hclk_usb_peri = hclk_usb_peri;
 578         clk_prepare_enable(hclk_usb_peri);
 579
 580 #ifdef CONFIG_USB20_OTG
 581         if (usb20otg_get_status(USB_STATUS_BVABLID))
 582                 schedule_delayed_work(&control_usb->usb_charger_det_work,
 583                                       HZ / 10);
 584 #endif
 585
 586         ret = otg_irq_detect_init(pdev);
 587         if (ret < 0)
 588                 goto err2;
 589
 590         return 0;
 591
 592 err2:
 593         clk_disable_unprepare(hclk_usb_peri);
 594 err1:
 595         return ret;
 596 }
 597
 598 static int dwc_otg_control_usb_remove(struct platform_device *pdev)
 599 {
 600         clk_disable_unprepare(control_usb->hclk_usb_peri);
 601         return 0;
 602 }
 603
 604 static struct platform_driver dwc_otg_control_usb_driver = {
 605         .probe = dwc_otg_control_usb_probe,
 606         .remove = dwc_otg_control_usb_remove,
 607         .driver = {
 608                    .name = "rk3126-dwc-control-usb",
 609                    .owner = THIS_MODULE,
 610                    .of_match_table = of_match_ptr(dwc_otg_control_usb_id_table),
 611                    },
 612 };
 613
 614 static int __init dwc_otg_control_usb_init(void)
 615 {
 616         int retval = 0;
 617
 618         retval |= platform_driver_register(&rk_usb_control_driver);
 619         retval |= platform_driver_register(&dwc_otg_control_usb_driver);
 620         return retval;
 621 }
 622
 623 subsys_initcall(dwc_otg_control_usb_init);
 624
 625 static void __exit dwc_otg_control_usb_exit(void)
 626 {
 627         platform_driver_unregister(&rk_usb_control_driver);
 628         platform_driver_unregister(&dwc_otg_control_usb_driver);
 629 }
 630
 631 module_exit(dwc_otg_control_usb_exit);
 632 MODULE_ALIAS("platform: dwc_control_usb");
 633 MODULE_AUTHOR("RockChip Inc.");
 634 MODULE_DESCRIPTION("RockChip Control Module USB Driver");
 635 MODULE_LICENSE("GPL v2");
 636