drivers/usb/host/ehci-tegra.c

   1 /*
   2  * EHCI-compliant USB host controller driver for NVIDIA Tegra SoCs
   3  *
   4  * Copyright (C) 2010 Google, Inc.
   5  * Copyright (C) 2009 NVIDIA Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  */
  18
  19 #include <linux/clk.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/platform_data/tegra_usb.h>
  22 #include <linux/irq.h>
  23 #include <linux/usb/otg.h>
  24 #include <linux/gpio.h>
  25 #include <linux/of.h>
  26 #include <linux/of_gpio.h>
  27 #include <linux/pm_runtime.h>
  28
  29 #include <mach/usb_phy.h>
  30 #include <mach/iomap.h>
  31
  32 #define TEGRA_USB_DMA_ALIGN 32
  33
  34 struct tegra_ehci_hcd {
  35         struct ehci_hcd *ehci;
  36         struct tegra_usb_phy *phy;
  37         struct clk *clk;
  38         struct clk *emc_clk;
  39         struct usb_phy *transceiver;
  40         int host_resumed;
  41         int port_resuming;
  42         enum tegra_usb_phy_port_speed port_speed;
  43 };
  44
  45 static void tegra_ehci_power_up(struct usb_hcd *hcd)
  46 {
  47         struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller);
  48
  49         clk_enable(tegra->emc_clk);
  50         clk_enable(tegra->clk);
  51         tegra_usb_phy_power_on(tegra->phy);
  52         tegra->host_resumed = 1;
  53 }
  54
  55 static void tegra_ehci_power_down(struct usb_hcd *hcd)
  56 {
  57         struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller);
  58
  59         tegra->host_resumed = 0;
  60         tegra_usb_phy_power_off(tegra->phy);
  61         clk_disable(tegra->clk);
  62         clk_disable(tegra->emc_clk);
  63 }
  64
  65 static int tegra_ehci_internal_port_reset(
  66         struct ehci_hcd *ehci,
  67         u32 __iomem     *portsc_reg
  68 )
  69 {
  70         u32             temp;
  71         unsigned long   flags;
  72         int             retval = 0;
  73         int             i, tries;
  74         u32             saved_usbintr;
  75
  76         spin_lock_irqsave(&ehci->lock, flags);
  77         saved_usbintr = ehci_readl(ehci, &ehci->regs->intr_enable);
  78         /* disable USB interrupt */
  79         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
  80         spin_unlock_irqrestore(&ehci->lock, flags);
  81
  82         /*
  83          * Here we have to do Port Reset at most twice for
  84          * Port Enable bit to be set.
  85          */
  86         for (i = 0; i < 2; i++) {
  87                 temp = ehci_readl(ehci, portsc_reg);
  88                 temp |= PORT_RESET;
  89                 ehci_writel(ehci, temp, portsc_reg);
  90                 mdelay(10);
  91                 temp &= ~PORT_RESET;
  92                 ehci_writel(ehci, temp, portsc_reg);
  93                 mdelay(1);
  94                 tries = 100;
  95                 do {
  96                         mdelay(1);
  97                         /*
  98                          * Up to this point, Port Enable bit is
  99                          * expected to be set after 2 ms waiting.
 100                          * USB1 usually takes extra 45 ms, for safety,
 101                          * we take 100 ms as timeout.
 102                          */
 103                         temp = ehci_readl(ehci, portsc_reg);
 104                 } while (!(temp & PORT_PE) && tries--);
 105                 if (temp & PORT_PE)
 106                         break;
 107         }
 108         if (i == 2)
 109                 retval = -ETIMEDOUT;
 110
 111         /*
 112          * Clear Connect Status Change bit if it's set.
 113          * We can't clear PORT_PEC. It will also cause PORT_PE to be cleared.
 114          */
 115         if (temp & PORT_CSC)
 116                 ehci_writel(ehci, PORT_CSC, portsc_reg);
 117
 118         /*
 119          * Write to clear any interrupt status bits that might be set
 120          * during port reset.
 121          */
 122         temp = ehci_readl(ehci, &ehci->regs->status);
 123         ehci_writel(ehci, temp, &ehci->regs->status);
 124
 125         /* restore original interrupt enable bits */
 126         ehci_writel(ehci, saved_usbintr, &ehci->regs->intr_enable);
 127         return retval;
 128 }
 129
 130 static int tegra_ehci_hub_control(
 131         struct usb_hcd  *hcd,
 132         u16             typeReq,
 133         u16             wValue,
 134         u16             wIndex,
 135         char            *buf,
 136         u16             wLength
 137 )
 138 {
 139         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 140         struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller);
 141         u32 __iomem     *status_reg;
 142         u32             temp;
 143         unsigned long   flags;
 144         int             retval = 0;
 145
 146         status_reg = &ehci->regs->port_status[(wIndex & 0xff) - 1];
 147
 148         spin_lock_irqsave(&ehci->lock, flags);
 149
 150         /*
 151          * In ehci_hub_control() for USB_PORT_FEAT_ENABLE clears the other bits
 152          * that are write on clear, by writing back the register read value, so
 153          * USB_PORT_FEAT_ENABLE is handled by masking the set on clear bits
 154          */
 155         if (typeReq == ClearPortFeature && wValue == USB_PORT_FEAT_ENABLE) {
 156                 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
 157                 ehci_writel(ehci, temp & ~PORT_PE, status_reg);
 158                 goto done;
 159         }
 160
 161         else if (typeReq == GetPortStatus) {
 162                 temp = ehci_readl(ehci, status_reg);
 163                 if (tegra->port_resuming && !(temp & PORT_SUSPEND)) {
 164                         /* Resume completed, re-enable disconnect detection */
 165                         tegra->port_resuming = 0;
 166                         tegra_usb_phy_postresume(tegra->phy);
 167                 }
 168         }
 169
 170         else if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
 171                 temp = ehci_readl(ehci, status_reg);
 172                 if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) != 0) {
 173                         retval = -EPIPE;
 174                         goto done;
 175                 }
 176
 177                 temp &= ~PORT_WKCONN_E;
 178                 temp |= PORT_WKDISC_E | PORT_WKOC_E;
 179                 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
 180
 181                 /*
 182                  * If a transaction is in progress, there may be a delay in
 183                  * suspending the port. Poll until the port is suspended.
 184                  */
 185                 if (handshake(ehci, status_reg, PORT_SUSPEND,
 186                                                 PORT_SUSPEND, 5000))
 187                         pr_err("%s: timeout waiting for SUSPEND\n", __func__);
 188
 189                 set_bit((wIndex & 0xff) - 1, &ehci->suspended_ports);
 190                 goto done;
 191         }
 192
 193         /* For USB1 port we need to issue Port Reset twice internally */
 194         if (tegra->phy->instance == 0 &&
 195            (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_RESET)) {
 196                 spin_unlock_irqrestore(&ehci->lock, flags);
 197                 return tegra_ehci_internal_port_reset(ehci, status_reg);
 198         }
 199
 200         /*
 201          * Tegra host controller will time the resume operation to clear the bit
 202          * when the port control state switches to HS or FS Idle. This behavior
 203          * is different from EHCI where the host controller driver is required
 204          * to set this bit to a zero after the resume duration is timed in the
 205          * driver.
 206          */
 207         else if (typeReq == ClearPortFeature &&
 208                                         wValue == USB_PORT_FEAT_SUSPEND) {
 209                 temp = ehci_readl(ehci, status_reg);
 210                 if ((temp & PORT_RESET) || !(temp & PORT_PE)) {
 211                         retval = -EPIPE;
 212                         goto done;
 213                 }
 214
 215                 if (!(temp & PORT_SUSPEND))
 216                         goto done;
 217
 218                 /* Disable disconnect detection during port resume */
 219                 tegra_usb_phy_preresume(tegra->phy);
 220
 221                 ehci->reset_done[wIndex-1] = jiffies + msecs_to_jiffies(25);
 222
 223                 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
 224                 /* start resume signalling */
 225                 ehci_writel(ehci, temp | PORT_RESUME, status_reg);
 226                 set_bit(wIndex-1, &ehci->resuming_ports);
 227
 228                 spin_unlock_irqrestore(&ehci->lock, flags);
 229                 msleep(20);
 230                 spin_lock_irqsave(&ehci->lock, flags);
 231
 232                 /* Poll until the controller clears RESUME and SUSPEND */
 233                 if (handshake(ehci, status_reg, PORT_RESUME, 0, 2000))
 234                         pr_err("%s: timeout waiting for RESUME\n", __func__);
 235                 if (handshake(ehci, status_reg, PORT_SUSPEND, 0, 2000))
 236                         pr_err("%s: timeout waiting for SUSPEND\n", __func__);
 237
 238                 ehci->reset_done[wIndex-1] = 0;
 239                 clear_bit(wIndex-1, &ehci->resuming_ports);
 240
 241                 tegra->port_resuming = 1;
 242                 goto done;
 243         }
 244
 245         spin_unlock_irqrestore(&ehci->lock, flags);
 246
 247         /* Handle the hub control events here */
 248         return ehci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
 249 done:
 250         spin_unlock_irqrestore(&ehci->lock, flags);
 251         return retval;
 252 }
 253
 254 static void tegra_ehci_restart(struct usb_hcd *hcd)
 255 {
 256         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 257
 258         ehci_reset(ehci);
 259
 260         /* setup the frame list and Async q heads */
 261         ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
 262         ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
 263         /* setup the command register and set the controller in RUN mode */
 264         ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
 265         ehci->command |= CMD_RUN;
 266         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 267
 268         down_write(&ehci_cf_port_reset_rwsem);
 269         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 270         /* flush posted writes */
 271         ehci_readl(ehci, &ehci->regs->command);
 272         up_write(&ehci_cf_port_reset_rwsem);
 273 }
 274
 275 static void tegra_ehci_shutdown(struct usb_hcd *hcd)
 276 {
 277         struct tegra_ehci_hcd *tegra = dev_get_drvdata(hcd->self.controller);
 278
 279         /* ehci_shutdown touches the USB controller registers, make sure
 280          * controller has clocks to it */
 281         if (!tegra->host_resumed)
 282                 tegra_ehci_power_up(hcd);
 283
 284         ehci_shutdown(hcd);
 285 }
 286
 287 static int tegra_ehci_setup(struct usb_hcd *hcd)
 288 {
 289         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 290         int retval;
 291
 292         /* EHCI registers start at offset 0x100 */
 293         ehci->caps = hcd->regs + 0x100;
 294         ehci->regs = hcd->regs + 0x100 +
 295                 HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
 296
 297         dbg_hcs_params(ehci, "reset");
 298         dbg_hcc_params(ehci, "reset");
 299
 300         /* cache this readonly data; minimize chip reads */
 301         ehci->hcs_params = readl(&ehci->caps->hcs_params);
 302
 303         /* switch to host mode */
 304         hcd->has_tt = 1;
 305         ehci_reset(ehci);
 306
 307         retval = ehci_halt(ehci);
 308         if (retval)
 309                 return retval;
 310
 311         /* data structure init */
 312         retval = ehci_init(hcd);
 313         if (retval)
 314                 return retval;
 315
 316         ehci->sbrn = 0x20;
 317
 318         ehci_port_power(ehci, 1);
 319         return retval;
 320 }
 321
 322 struct temp_buffer {
 323         void *kmalloc_ptr;
 324         void *old_xfer_buffer;
 325         u8 data[0];
 326 };
 327
 328 static void free_temp_buffer(struct urb *urb)
 329 {
 330         enum dma_data_direction dir;
 331         struct temp_buffer *temp;
 332
 333         if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
 334                 return;
 335
 336         dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 337
 338         temp = container_of(urb->transfer_buffer, struct temp_buffer,
 339                             data);
 340
 341         if (dir == DMA_FROM_DEVICE)
 342                 memcpy(temp->old_xfer_buffer, temp->data,
 343                        urb->transfer_buffer_length);
 344         urb->transfer_buffer = temp->old_xfer_buffer;
 345         kfree(temp->kmalloc_ptr);
 346
 347         urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
 348 }
 349
 350 static int alloc_temp_buffer(struct urb *urb, gfp_t mem_flags)
 351 {
 352         enum dma_data_direction dir;
 353         struct temp_buffer *temp, *kmalloc_ptr;
 354         size_t kmalloc_size;
 355
 356         if (urb->num_sgs || urb->sg ||
 357             urb->transfer_buffer_length == 0 ||
 358             !((uintptr_t)urb->transfer_buffer & (TEGRA_USB_DMA_ALIGN - 1)))
 359                 return 0;
 360
 361         dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 362
 363         /* Allocate a buffer with enough padding for alignment */
 364         kmalloc_size = urb->transfer_buffer_length +
 365                 sizeof(struct temp_buffer) + TEGRA_USB_DMA_ALIGN - 1;
 366
 367         kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
 368         if (!kmalloc_ptr)
 369                 return -ENOMEM;
 370
 371         /* Position our struct temp_buffer such that data is aligned */
 372         temp = PTR_ALIGN(kmalloc_ptr + 1, TEGRA_USB_DMA_ALIGN) - 1;
 373
 374         temp->kmalloc_ptr = kmalloc_ptr;
 375         temp->old_xfer_buffer = urb->transfer_buffer;
 376         if (dir == DMA_TO_DEVICE)
 377                 memcpy(temp->data, urb->transfer_buffer,
 378                        urb->transfer_buffer_length);
 379         urb->transfer_buffer = temp->data;
 380
 381         urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;
 382
 383         return 0;
 384 }
 385
 386 static int tegra_ehci_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
 387                                       gfp_t mem_flags)
 388 {
 389         int ret;
 390
 391         ret = alloc_temp_buffer(urb, mem_flags);
 392         if (ret)
 393                 return ret;
 394
 395         ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
 396         if (ret)
 397                 free_temp_buffer(urb);
 398
 399         return ret;
 400 }
 401
 402 static void tegra_ehci_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
 403 {
 404         usb_hcd_unmap_urb_for_dma(hcd, urb);
 405         free_temp_buffer(urb);
 406 }
 407
 408 static const struct hc_driver tegra_ehci_hc_driver = {
 409         .description            = hcd_name,
 410         .product_desc           = "Tegra EHCI Host Controller",
 411         .hcd_priv_size          = sizeof(struct ehci_hcd),
 412
 413         .flags                  = HCD_USB2 | HCD_MEMORY,
 414
 415         .reset                  = tegra_ehci_setup,
 416         .irq                    = ehci_irq,
 417
 418         .start                  = ehci_run,
 419         .stop                   = ehci_stop,
 420         .shutdown               = tegra_ehci_shutdown,
 421         .urb_enqueue            = ehci_urb_enqueue,
 422         .urb_dequeue            = ehci_urb_dequeue,
 423         .map_urb_for_dma        = tegra_ehci_map_urb_for_dma,
 424         .unmap_urb_for_dma      = tegra_ehci_unmap_urb_for_dma,
 425         .endpoint_disable       = ehci_endpoint_disable,
 426         .endpoint_reset         = ehci_endpoint_reset,
 427         .get_frame_number       = ehci_get_frame,
 428         .hub_status_data        = ehci_hub_status_data,
 429         .hub_control            = tegra_ehci_hub_control,
 430         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 431 #ifdef CONFIG_PM
 432         .bus_suspend            = ehci_bus_suspend,
 433         .bus_resume             = ehci_bus_resume,
 434 #endif
 435         .relinquish_port        = ehci_relinquish_port,
 436         .port_handed_over       = ehci_port_handed_over,
 437 };
 438
 439 static int setup_vbus_gpio(struct platform_device *pdev)
 440 {
 441         int err = 0;
 442         int gpio;
 443
 444         if (!pdev->dev.of_node)
 445                 return 0;
 446
 447         gpio = of_get_named_gpio(pdev->dev.of_node, "nvidia,vbus-gpio", 0);
 448         if (!gpio_is_valid(gpio))
 449                 return 0;
 450
 451         err = gpio_request(gpio, "vbus_gpio");
 452         if (err) {
 453                 dev_err(&pdev->dev, "can't request vbus gpio %d", gpio);
 454                 return err;
 455         }
 456         err = gpio_direction_output(gpio, 1);
 457         if (err) {
 458                 dev_err(&pdev->dev, "can't enable vbus\n");
 459                 return err;
 460         }
 461         gpio_set_value(gpio, 1);
 462
 463         return err;
 464 }
 465
 466 #ifdef CONFIG_PM
 467
 468 static int controller_suspend(struct device *dev)
 469 {
 470         struct tegra_ehci_hcd *tegra =
 471                         platform_get_drvdata(to_platform_device(dev));
 472         struct ehci_hcd *ehci = tegra->ehci;
 473         struct usb_hcd *hcd = ehci_to_hcd(ehci);
 474         struct ehci_regs __iomem *hw = ehci->regs;
 475         unsigned long flags;
 476
 477         if (time_before(jiffies, ehci->next_statechange))
 478                 msleep(10);
 479
 480         spin_lock_irqsave(&ehci->lock, flags);
 481
 482         tegra->port_speed = (readl(&hw->port_status[0]) >> 26) & 0x3;
 483         ehci_halt(ehci);
 484         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 485
 486         spin_unlock_irqrestore(&ehci->lock, flags);
 487
 488         tegra_ehci_power_down(hcd);
 489         return 0;
 490 }
 491
 492 static int controller_resume(struct device *dev)
 493 {
 494         struct tegra_ehci_hcd *tegra =
 495                         platform_get_drvdata(to_platform_device(dev));
 496         struct ehci_hcd *ehci = tegra->ehci;
 497         struct usb_hcd *hcd = ehci_to_hcd(ehci);
 498         struct ehci_regs __iomem *hw = ehci->regs;
 499         unsigned long val;
 500
 501         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 502         tegra_ehci_power_up(hcd);
 503
 504         if (tegra->port_speed > TEGRA_USB_PHY_PORT_SPEED_HIGH) {
 505                 /* Wait for the phy to detect new devices
 506                  * before we restart the controller */
 507                 msleep(10);
 508                 goto restart;
 509         }
 510
 511         /* Force the phy to keep data lines in suspend state */
 512         tegra_ehci_phy_restore_start(tegra->phy, tegra->port_speed);
 513
 514         /* Enable host mode */
 515         tdi_reset(ehci);
 516
 517         /* Enable Port Power */
 518         val = readl(&hw->port_status[0]);
 519         val |= PORT_POWER;
 520         writel(val, &hw->port_status[0]);
 521         udelay(10);
 522
 523         /* Check if the phy resume from LP0. When the phy resume from LP0
 524          * USB register will be reset. */
 525         if (!readl(&hw->async_next)) {
 526                 /* Program the field PTC based on the saved speed mode */
 527                 val = readl(&hw->port_status[0]);
 528                 val &= ~PORT_TEST(~0);
 529                 if (tegra->port_speed == TEGRA_USB_PHY_PORT_SPEED_HIGH)
 530                         val |= PORT_TEST_FORCE;
 531                 else if (tegra->port_speed == TEGRA_USB_PHY_PORT_SPEED_FULL)
 532                         val |= PORT_TEST(6);
 533                 else if (tegra->port_speed == TEGRA_USB_PHY_PORT_SPEED_LOW)
 534                         val |= PORT_TEST(7);
 535                 writel(val, &hw->port_status[0]);
 536                 udelay(10);
 537
 538                 /* Disable test mode by setting PTC field to NORMAL_OP */
 539                 val = readl(&hw->port_status[0]);
 540                 val &= ~PORT_TEST(~0);
 541                 writel(val, &hw->port_status[0]);
 542                 udelay(10);
 543         }
 544
 545         /* Poll until CCS is enabled */
 546         if (handshake(ehci, &hw->port_status[0], PORT_CONNECT,
 547                                                  PORT_CONNECT, 2000)) {
 548                 pr_err("%s: timeout waiting for PORT_CONNECT\n", __func__);
 549                 goto restart;
 550         }
 551
 552         /* Poll until PE is enabled */
 553         if (handshake(ehci, &hw->port_status[0], PORT_PE,
 554                                                  PORT_PE, 2000)) {
 555                 pr_err("%s: timeout waiting for USB_PORTSC1_PE\n", __func__);
 556                 goto restart;
 557         }
 558
 559         /* Clear the PCI status, to avoid an interrupt taken upon resume */
 560         val = readl(&hw->status);
 561         val |= STS_PCD;
 562         writel(val, &hw->status);
 563
 564         /* Put controller in suspend mode by writing 1 to SUSP bit of PORTSC */
 565         val = readl(&hw->port_status[0]);
 566         if ((val & PORT_POWER) && (val & PORT_PE)) {
 567                 val |= PORT_SUSPEND;
 568                 writel(val, &hw->port_status[0]);
 569
 570                 /* Wait until port suspend completes */
 571                 if (handshake(ehci, &hw->port_status[0], PORT_SUSPEND,
 572                                                          PORT_SUSPEND, 1000)) {
 573                         pr_err("%s: timeout waiting for PORT_SUSPEND\n",
 574                                                                 __func__);
 575                         goto restart;
 576                 }
 577         }
 578
 579         tegra_ehci_phy_restore_end(tegra->phy);
 580         goto done;
 581
 582  restart:
 583         if (tegra->port_speed <= TEGRA_USB_PHY_PORT_SPEED_HIGH)
 584                 tegra_ehci_phy_restore_end(tegra->phy);
 585
 586         tegra_ehci_restart(hcd);
 587
 588  done:
 589         tegra_usb_phy_preresume(tegra->phy);
 590         tegra->port_resuming = 1;
 591         return 0;
 592 }
 593
 594 static int tegra_ehci_suspend(struct device *dev)
 595 {
 596         struct tegra_ehci_hcd *tegra =
 597                         platform_get_drvdata(to_platform_device(dev));
 598         struct usb_hcd *hcd = ehci_to_hcd(tegra->ehci);
 599         int rc = 0;
 600
 601         /*
 602          * When system sleep is supported and USB controller wakeup is
 603          * implemented: If the controller is runtime-suspended and the
 604          * wakeup setting needs to be changed, call pm_runtime_resume().
 605          */
 606         if (HCD_HW_ACCESSIBLE(hcd))
 607                 rc = controller_suspend(dev);
 608         return rc;
 609 }
 610
 611 static int tegra_ehci_resume(struct device *dev)
 612 {
 613         int rc;
 614
 615         rc = controller_resume(dev);
 616         if (rc == 0) {
 617                 pm_runtime_disable(dev);
 618                 pm_runtime_set_active(dev);
 619                 pm_runtime_enable(dev);
 620         }
 621         return rc;
 622 }
 623
 624 static int tegra_ehci_runtime_suspend(struct device *dev)
 625 {
 626         return controller_suspend(dev);
 627 }
 628
 629 static int tegra_ehci_runtime_resume(struct device *dev)
 630 {
 631         return controller_resume(dev);
 632 }
 633
 634 static const struct dev_pm_ops tegra_ehci_pm_ops = {
 635         .suspend        = tegra_ehci_suspend,
 636         .resume         = tegra_ehci_resume,
 637         .runtime_suspend = tegra_ehci_runtime_suspend,
 638         .runtime_resume = tegra_ehci_runtime_resume,
 639 };
 640
 641 #endif
 642
 643 static u64 tegra_ehci_dma_mask = DMA_BIT_MASK(32);
 644
 645 static int tegra_ehci_probe(struct platform_device *pdev)
 646 {
 647         struct resource *res;
 648         struct usb_hcd *hcd;
 649         struct tegra_ehci_hcd *tegra;
 650         struct tegra_ehci_platform_data *pdata;
 651         int err = 0;
 652         int irq;
 653         int instance = pdev->id;
 654
 655         pdata = pdev->dev.platform_data;
 656         if (!pdata) {
 657                 dev_err(&pdev->dev, "Platform data missing\n");
 658                 return -EINVAL;
 659         }
 660
 661         /* Right now device-tree probed devices don't get dma_mask set.
 662          * Since shared usb code relies on it, set it here for now.
 663          * Once we have dma capability bindings this can go away.
 664          */
 665         if (!pdev->dev.dma_mask)
 666                 pdev->dev.dma_mask = &tegra_ehci_dma_mask;
 667
 668         setup_vbus_gpio(pdev);
 669
 670         tegra = kzalloc(sizeof(struct tegra_ehci_hcd), GFP_KERNEL);
 671         if (!tegra)
 672                 return -ENOMEM;
 673
 674         hcd = usb_create_hcd(&tegra_ehci_hc_driver, &pdev->dev,
 675                                         dev_name(&pdev->dev));
 676         if (!hcd) {
 677                 dev_err(&pdev->dev, "Unable to create HCD\n");
 678                 err = -ENOMEM;
 679                 goto fail_hcd;
 680         }
 681
 682         platform_set_drvdata(pdev, tegra);
 683
 684         tegra->clk = clk_get(&pdev->dev, NULL);
 685         if (IS_ERR(tegra->clk)) {
 686                 dev_err(&pdev->dev, "Can't get ehci clock\n");
 687                 err = PTR_ERR(tegra->clk);
 688                 goto fail_clk;
 689         }
 690
 691         err = clk_enable(tegra->clk);
 692         if (err)
 693                 goto fail_clken;
 694
 695         tegra->emc_clk = clk_get(&pdev->dev, "emc");
 696         if (IS_ERR(tegra->emc_clk)) {
 697                 dev_err(&pdev->dev, "Can't get emc clock\n");
 698                 err = PTR_ERR(tegra->emc_clk);
 699                 goto fail_emc_clk;
 700         }
 701
 702         clk_enable(tegra->emc_clk);
 703         clk_set_rate(tegra->emc_clk, 400000000);
 704
 705         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 706         if (!res) {
 707                 dev_err(&pdev->dev, "Failed to get I/O memory\n");
 708                 err = -ENXIO;
 709                 goto fail_io;
 710         }
 711         hcd->rsrc_start = res->start;
 712         hcd->rsrc_len = resource_size(res);
 713         hcd->regs = ioremap(res->start, resource_size(res));
 714         if (!hcd->regs) {
 715                 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
 716                 err = -ENOMEM;
 717                 goto fail_io;
 718         }
 719
 720         /* This is pretty ugly and needs to be fixed when we do only
 721          * device-tree probing. Old code relies on the platform_device
 722          * numbering that we lack for device-tree-instantiated devices.
 723          */
 724         if (instance < 0) {
 725                 switch (res->start) {
 726                 case TEGRA_USB_BASE:
 727                         instance = 0;
 728                         break;
 729                 case TEGRA_USB2_BASE:
 730                         instance = 1;
 731                         break;
 732                 case TEGRA_USB3_BASE:
 733                         instance = 2;
 734                         break;
 735                 default:
 736                         err = -ENODEV;
 737                         dev_err(&pdev->dev, "unknown usb instance\n");
 738                         goto fail_phy;
 739                 }
 740         }
 741
 742         tegra->phy = tegra_usb_phy_open(instance, hcd->regs, pdata->phy_config,
 743                                                 TEGRA_USB_PHY_MODE_HOST);
 744         if (IS_ERR(tegra->phy)) {
 745                 dev_err(&pdev->dev, "Failed to open USB phy\n");
 746                 err = -ENXIO;
 747                 goto fail_phy;
 748         }
 749
 750         err = tegra_usb_phy_power_on(tegra->phy);
 751         if (err) {
 752                 dev_err(&pdev->dev, "Failed to power on the phy\n");
 753                 goto fail;
 754         }
 755
 756         tegra->host_resumed = 1;
 757         tegra->ehci = hcd_to_ehci(hcd);
 758
 759         irq = platform_get_irq(pdev, 0);
 760         if (!irq) {
 761                 dev_err(&pdev->dev, "Failed to get IRQ\n");
 762                 err = -ENODEV;
 763                 goto fail;
 764         }
 765
 766 #ifdef CONFIG_USB_OTG_UTILS
 767         if (pdata->operating_mode == TEGRA_USB_OTG) {
 768                 tegra->transceiver = usb_get_transceiver();
 769                 if (tegra->transceiver)
 770                         otg_set_host(tegra->transceiver->otg, &hcd->self);
 771         }
 772 #endif
 773
 774         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 775         if (err) {
 776                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
 777                 goto fail;
 778         }
 779
 780         pm_runtime_set_active(&pdev->dev);
 781         pm_runtime_get_noresume(&pdev->dev);
 782
 783         /* Don't skip the pm_runtime_forbid call if wakeup isn't working */
 784         /* if (!pdata->power_down_on_bus_suspend) */
 785                 pm_runtime_forbid(&pdev->dev);
 786         pm_runtime_enable(&pdev->dev);
 787         pm_runtime_put_sync(&pdev->dev);
 788         return err;
 789
 790 fail:
 791 #ifdef CONFIG_USB_OTG_UTILS
 792         if (tegra->transceiver) {
 793                 otg_set_host(tegra->transceiver->otg, NULL);
 794                 usb_put_transceiver(tegra->transceiver);
 795         }
 796 #endif
 797         tegra_usb_phy_close(tegra->phy);
 798 fail_phy:
 799         iounmap(hcd->regs);
 800 fail_io:
 801         clk_disable(tegra->emc_clk);
 802         clk_put(tegra->emc_clk);
 803 fail_emc_clk:
 804         clk_disable(tegra->clk);
 805 fail_clken:
 806         clk_put(tegra->clk);
 807 fail_clk:
 808         usb_put_hcd(hcd);
 809 fail_hcd:
 810         kfree(tegra);
 811         return err;
 812 }
 813
 814 static int tegra_ehci_remove(struct platform_device *pdev)
 815 {
 816         struct tegra_ehci_hcd *tegra = platform_get_drvdata(pdev);
 817         struct usb_hcd *hcd = ehci_to_hcd(tegra->ehci);
 818
 819         if (tegra == NULL || hcd == NULL)
 820                 return -EINVAL;
 821
 822         pm_runtime_get_sync(&pdev->dev);
 823         pm_runtime_disable(&pdev->dev);
 824         pm_runtime_put_noidle(&pdev->dev);
 825
 826 #ifdef CONFIG_USB_OTG_UTILS
 827         if (tegra->transceiver) {
 828                 otg_set_host(tegra->transceiver->otg, NULL);
 829                 usb_put_transceiver(tegra->transceiver);
 830         }
 831 #endif
 832
 833         usb_remove_hcd(hcd);
 834         usb_put_hcd(hcd);
 835
 836         tegra_usb_phy_close(tegra->phy);
 837         iounmap(hcd->regs);
 838
 839         clk_disable(tegra->clk);
 840         clk_put(tegra->clk);
 841
 842         clk_disable(tegra->emc_clk);
 843         clk_put(tegra->emc_clk);
 844
 845         kfree(tegra);
 846         return 0;
 847 }
 848
 849 static void tegra_ehci_hcd_shutdown(struct platform_device *pdev)
 850 {
 851         struct tegra_ehci_hcd *tegra = platform_get_drvdata(pdev);
 852         struct usb_hcd *hcd = ehci_to_hcd(tegra->ehci);
 853
 854         if (hcd->driver->shutdown)
 855                 hcd->driver->shutdown(hcd);
 856 }
 857
 858 static struct of_device_id tegra_ehci_of_match[] __devinitdata = {
 859         { .compatible = "nvidia,tegra20-ehci", },
 860         { },
 861 };
 862
 863 static struct platform_driver tegra_ehci_driver = {
 864         .probe          = tegra_ehci_probe,
 865         .remove         = tegra_ehci_remove,
 866         .shutdown       = tegra_ehci_hcd_shutdown,
 867         .driver         = {
 868                 .name   = "tegra-ehci",
 869                 .of_match_table = tegra_ehci_of_match,
 870 #ifdef CONFIG_PM
 871                 .pm     = &tegra_ehci_pm_ops,
 872 #endif
 873         }
 874 };