drivers/usb/host/ehci-fsl.c

   1 /*
   2  * Copyright 2005-2009 MontaVista Software, Inc.
   3  * Copyright 2008      Freescale Semiconductor, Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software Foundation,
  17  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  * Ported to 834x by Randy Vinson <rvinson@mvista.com> using code provided
  20  * by Hunter Wu.
  21  * Power Management support by Dave Liu <daveliu@freescale.com>,
  22  * Jerry Huang <Chang-Ming.Huang@freescale.com> and
  23  * Anton Vorontsov <avorontsov@ru.mvista.com>.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/types.h>
  28 #include <linux/delay.h>
  29 #include <linux/pm.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/fsl_devices.h>
  32
  33 #include "ehci-fsl.h"
  34
  35 /* configure so an HC device and id are always provided */
  36 /* always called with process context; sleeping is OK */
  37
  38 /**
  39  * usb_hcd_fsl_probe - initialize FSL-based HCDs
  40  * @drvier: Driver to be used for this HCD
  41  * @pdev: USB Host Controller being probed
  42  * Context: !in_interrupt()
  43  *
  44  * Allocates basic resources for this USB host controller.
  45  *
  46  */
  47 static int usb_hcd_fsl_probe(const struct hc_driver *driver,
  48                              struct platform_device *pdev)
  49 {
  50         struct fsl_usb2_platform_data *pdata;
  51         struct usb_hcd *hcd;
  52         struct resource *res;
  53         int irq;
  54         int retval;
  55
  56         pr_debug("initializing FSL-SOC USB Controller\n");
  57
  58         /* Need platform data for setup */
  59         pdata = (struct fsl_usb2_platform_data *)pdev->dev.platform_data;
  60         if (!pdata) {
  61                 dev_err(&pdev->dev,
  62                         "No platform data for %s.\n", dev_name(&pdev->dev));
  63                 return -ENODEV;
  64         }
  65
  66         /*
  67          * This is a host mode driver, verify that we're supposed to be
  68          * in host mode.
  69          */
  70         if (!((pdata->operating_mode == FSL_USB2_DR_HOST) ||
  71               (pdata->operating_mode == FSL_USB2_MPH_HOST) ||
  72               (pdata->operating_mode == FSL_USB2_DR_OTG))) {
  73                 dev_err(&pdev->dev,
  74                         "Non Host Mode configured for %s. Wrong driver linked.\n",
  75                         dev_name(&pdev->dev));
  76                 return -ENODEV;
  77         }
  78
  79         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  80         if (!res) {
  81                 dev_err(&pdev->dev,
  82                         "Found HC with no IRQ. Check %s setup!\n",
  83                         dev_name(&pdev->dev));
  84                 return -ENODEV;
  85         }
  86         irq = res->start;
  87
  88         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  89         if (!hcd) {
  90                 retval = -ENOMEM;
  91                 goto err1;
  92         }
  93
  94         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  95         if (!res) {
  96                 dev_err(&pdev->dev,
  97                         "Found HC with no register addr. Check %s setup!\n",
  98                         dev_name(&pdev->dev));
  99                 retval = -ENODEV;
 100                 goto err2;
 101         }
 102         hcd->rsrc_start = res->start;
 103         hcd->rsrc_len = resource_size(res);
 104         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 105                                 driver->description)) {
 106                 dev_dbg(&pdev->dev, "controller already in use\n");
 107                 retval = -EBUSY;
 108                 goto err2;
 109         }
 110         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 111
 112         if (hcd->regs == NULL) {
 113                 dev_dbg(&pdev->dev, "error mapping memory\n");
 114                 retval = -EFAULT;
 115                 goto err3;
 116         }
 117
 118         pdata->regs = hcd->regs;
 119
 120         if (pdata->power_budget)
 121                 hcd->power_budget = pdata->power_budget;
 122
 123         /*
 124          * do platform specific init: check the clock, grab/config pins, etc.
 125          */
 126         if (pdata->init && pdata->init(pdev)) {
 127                 retval = -ENODEV;
 128                 goto err4;
 129         }
 130
 131         /* Enable USB controller, 83xx or 8536 */
 132         if (pdata->have_sysif_regs)
 133                 setbits32(hcd->regs + FSL_SOC_USB_CTRL, 0x4);
 134
 135         /* Don't need to set host mode here. It will be done by tdi_reset() */
 136
 137         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 138         if (retval != 0)
 139                 goto err4;
 140
 141 #ifdef CONFIG_USB_OTG
 142         if (pdata->operating_mode == FSL_USB2_DR_OTG) {
 143                 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 144
 145                 ehci->transceiver = otg_get_transceiver();
 146                 dev_dbg(&pdev->dev, "hcd=0x%p  ehci=0x%p, transceiver=0x%p\n",
 147                         hcd, ehci, ehci->transceiver);
 148
 149                 if (ehci->transceiver) {
 150                         retval = otg_set_host(ehci->transceiver,
 151                                               &ehci_to_hcd(ehci)->self);
 152                         if (retval) {
 153                                 if (ehci->transceiver)
 154                                         put_device(ehci->transceiver->dev);
 155                                 goto err4;
 156                         }
 157                 } else {
 158                         dev_err(&pdev->dev, "can't find transceiver\n");
 159                         retval = -ENODEV;
 160                         goto err4;
 161                 }
 162         }
 163 #endif
 164         return retval;
 165
 166       err4:
 167         iounmap(hcd->regs);
 168       err3:
 169         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 170       err2:
 171         usb_put_hcd(hcd);
 172       err1:
 173         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), retval);
 174         if (pdata->exit)
 175                 pdata->exit(pdev);
 176         return retval;
 177 }
 178
 179 /* may be called without controller electrically present */
 180 /* may be called with controller, bus, and devices active */
 181
 182 /**
 183  * usb_hcd_fsl_remove - shutdown processing for FSL-based HCDs
 184  * @dev: USB Host Controller being removed
 185  * Context: !in_interrupt()
 186  *
 187  * Reverses the effect of usb_hcd_fsl_probe().
 188  *
 189  */
 190 static void usb_hcd_fsl_remove(struct usb_hcd *hcd,
 191                                struct platform_device *pdev)
 192 {
 193         struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;
 194         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 195
 196         if (ehci->transceiver) {
 197                 otg_set_host(ehci->transceiver, NULL);
 198                 put_device(ehci->transceiver->dev);
 199         }
 200
 201         usb_remove_hcd(hcd);
 202
 203         /*
 204          * do platform specific un-initialization:
 205          * release iomux pins, disable clock, etc.
 206          */
 207         if (pdata->exit)
 208                 pdata->exit(pdev);
 209         iounmap(hcd->regs);
 210         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 211         usb_put_hcd(hcd);
 212 }
 213
 214 static void ehci_fsl_setup_phy(struct ehci_hcd *ehci,
 215                                enum fsl_usb2_phy_modes phy_mode,
 216                                unsigned int port_offset)
 217 {
 218         u32 portsc;
 219
 220         portsc = ehci_readl(ehci, &ehci->regs->port_status[port_offset]);
 221         portsc &= ~(PORT_PTS_MSK | PORT_PTS_PTW);
 222
 223         switch (phy_mode) {
 224         case FSL_USB2_PHY_ULPI:
 225                 portsc |= PORT_PTS_ULPI;
 226                 break;
 227         case FSL_USB2_PHY_SERIAL:
 228                 portsc |= PORT_PTS_SERIAL;
 229                 break;
 230         case FSL_USB2_PHY_UTMI_WIDE:
 231                 portsc |= PORT_PTS_PTW;
 232                 /* fall through */
 233         case FSL_USB2_PHY_UTMI:
 234                 portsc |= PORT_PTS_UTMI;
 235                 break;
 236         case FSL_USB2_PHY_NONE:
 237                 break;
 238         }
 239         ehci_writel(ehci, portsc, &ehci->regs->port_status[port_offset]);
 240 }
 241
 242 static void ehci_fsl_usb_setup(struct ehci_hcd *ehci)
 243 {
 244         struct usb_hcd *hcd = ehci_to_hcd(ehci);
 245         struct fsl_usb2_platform_data *pdata;
 246         void __iomem *non_ehci = hcd->regs;
 247         u32 temp;
 248
 249         pdata = hcd->self.controller->platform_data;
 250
 251         /* Enable PHY interface in the control reg. */
 252         if (pdata->have_sysif_regs) {
 253                 temp = in_be32(non_ehci + FSL_SOC_USB_CTRL);
 254                 out_be32(non_ehci + FSL_SOC_USB_CTRL, temp | 0x00000004);
 255                 out_be32(non_ehci + FSL_SOC_USB_SNOOP1, 0x0000001b);
 256         }
 257
 258 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
 259         /*
 260          * Turn on cache snooping hardware, since some PowerPC platforms
 261          * wholly rely on hardware to deal with cache coherent
 262          */
 263
 264         /* Setup Snooping for all the 4GB space */
 265         /* SNOOP1 starts from 0x0, size 2G */
 266         out_be32(non_ehci + FSL_SOC_USB_SNOOP1, 0x0 | SNOOP_SIZE_2GB);
 267         /* SNOOP2 starts from 0x80000000, size 2G */
 268         out_be32(non_ehci + FSL_SOC_USB_SNOOP2, 0x80000000 | SNOOP_SIZE_2GB);
 269 #endif
 270
 271         if ((pdata->operating_mode == FSL_USB2_DR_HOST) ||
 272                         (pdata->operating_mode == FSL_USB2_DR_OTG))
 273                 ehci_fsl_setup_phy(ehci, pdata->phy_mode, 0);
 274
 275         if (pdata->operating_mode == FSL_USB2_MPH_HOST) {
 276                 unsigned int chip, rev, svr;
 277
 278                 svr = mfspr(SPRN_SVR);
 279                 chip = svr >> 16;
 280                 rev = (svr >> 4) & 0xf;
 281
 282                 /* Deal with USB Erratum #14 on MPC834x Rev 1.0 & 1.1 chips */
 283                 if ((rev == 1) && (chip >= 0x8050) && (chip <= 0x8055))
 284                         ehci->has_fsl_port_bug = 1;
 285
 286                 if (pdata->port_enables & FSL_USB2_PORT0_ENABLED)
 287                         ehci_fsl_setup_phy(ehci, pdata->phy_mode, 0);
 288                 if (pdata->port_enables & FSL_USB2_PORT1_ENABLED)
 289                         ehci_fsl_setup_phy(ehci, pdata->phy_mode, 1);
 290         }
 291
 292         if (pdata->have_sysif_regs) {
 293 #ifdef CONFIG_PPC_85xx
 294                 out_be32(non_ehci + FSL_SOC_USB_PRICTRL, 0x00000008);
 295                 out_be32(non_ehci + FSL_SOC_USB_AGECNTTHRSH, 0x00000080);
 296 #else
 297                 out_be32(non_ehci + FSL_SOC_USB_PRICTRL, 0x0000000c);
 298                 out_be32(non_ehci + FSL_SOC_USB_AGECNTTHRSH, 0x00000040);
 299 #endif
 300                 out_be32(non_ehci + FSL_SOC_USB_SICTRL, 0x00000001);
 301         }
 302 }
 303
 304 /* called after powerup, by probe or system-pm "wakeup" */
 305 static int ehci_fsl_reinit(struct ehci_hcd *ehci)
 306 {
 307         ehci_fsl_usb_setup(ehci);
 308         ehci_port_power(ehci, 0);
 309
 310         return 0;
 311 }
 312
 313 /* called during probe() after chip reset completes */
 314 static int ehci_fsl_setup(struct usb_hcd *hcd)
 315 {
 316         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 317         int retval;
 318         struct fsl_usb2_platform_data *pdata;
 319
 320         pdata = hcd->self.controller->platform_data;
 321         ehci->big_endian_desc = pdata->big_endian_desc;
 322         ehci->big_endian_mmio = pdata->big_endian_mmio;
 323
 324         /* EHCI registers start at offset 0x100 */
 325         ehci->caps = hcd->regs + 0x100;
 326         ehci->regs = hcd->regs + 0x100 +
 327                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 328         dbg_hcs_params(ehci, "reset");
 329         dbg_hcc_params(ehci, "reset");
 330
 331         /* cache this readonly data; minimize chip reads */
 332         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 333
 334         hcd->has_tt = 1;
 335
 336         retval = ehci_halt(ehci);
 337         if (retval)
 338                 return retval;
 339
 340         /* data structure init */
 341         retval = ehci_init(hcd);
 342         if (retval)
 343                 return retval;
 344
 345         ehci->sbrn = 0x20;
 346
 347         ehci_reset(ehci);
 348
 349         retval = ehci_fsl_reinit(ehci);
 350         return retval;
 351 }
 352
 353 struct ehci_fsl {
 354         struct ehci_hcd ehci;
 355
 356 #ifdef CONFIG_PM
 357         /* Saved USB PHY settings, need to restore after deep sleep. */
 358         u32 usb_ctrl;
 359 #endif
 360 };
 361
 362 #ifdef CONFIG_PM
 363
 364 #ifdef CONFIG_PPC_MPC512x
 365 static int ehci_fsl_mpc512x_drv_suspend(struct device *dev)
 366 {
 367         struct usb_hcd *hcd = dev_get_drvdata(dev);
 368         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 369         struct fsl_usb2_platform_data *pdata = dev->platform_data;
 370         u32 tmp;
 371
 372 #ifdef DEBUG
 373         u32 mode = ehci_readl(ehci, hcd->regs + FSL_SOC_USB_USBMODE);
 374         mode &= USBMODE_CM_MASK;
 375         tmp = ehci_readl(ehci, hcd->regs + 0x140);      /* usbcmd */
 376
 377         dev_dbg(dev, "suspend=%d already_suspended=%d "
 378                 "mode=%d  usbcmd %08x\n", pdata->suspended,
 379                 pdata->already_suspended, mode, tmp);
 380 #endif
 381
 382         /*
 383          * If the controller is already suspended, then this must be a
 384          * PM suspend.  Remember this fact, so that we will leave the
 385          * controller suspended at PM resume time.
 386          */
 387         if (pdata->suspended) {
 388                 dev_dbg(dev, "already suspended, leaving early\n");
 389                 pdata->already_suspended = 1;
 390                 return 0;
 391         }
 392
 393         dev_dbg(dev, "suspending...\n");
 394
 395         ehci->rh_state = EHCI_RH_SUSPENDED;
 396         dev->power.power_state = PMSG_SUSPEND;
 397
 398         /* ignore non-host interrupts */
 399         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 400
 401         /* stop the controller */
 402         tmp = ehci_readl(ehci, &ehci->regs->command);
 403         tmp &= ~CMD_RUN;
 404         ehci_writel(ehci, tmp, &ehci->regs->command);
 405
 406         /* save EHCI registers */
 407         pdata->pm_command = ehci_readl(ehci, &ehci->regs->command);
 408         pdata->pm_command &= ~CMD_RUN;
 409         pdata->pm_status  = ehci_readl(ehci, &ehci->regs->status);
 410         pdata->pm_intr_enable  = ehci_readl(ehci, &ehci->regs->intr_enable);
 411         pdata->pm_frame_index  = ehci_readl(ehci, &ehci->regs->frame_index);
 412         pdata->pm_segment  = ehci_readl(ehci, &ehci->regs->segment);
 413         pdata->pm_frame_list  = ehci_readl(ehci, &ehci->regs->frame_list);
 414         pdata->pm_async_next  = ehci_readl(ehci, &ehci->regs->async_next);
 415         pdata->pm_configured_flag  =
 416                 ehci_readl(ehci, &ehci->regs->configured_flag);
 417         pdata->pm_portsc = ehci_readl(ehci, &ehci->regs->port_status[0]);
 418         pdata->pm_usbgenctrl = ehci_readl(ehci,
 419                                           hcd->regs + FSL_SOC_USB_USBGENCTRL);
 420
 421         /* clear the W1C bits */
 422         pdata->pm_portsc &= cpu_to_hc32(ehci, ~PORT_RWC_BITS);
 423
 424         pdata->suspended = 1;
 425
 426         /* clear PP to cut power to the port */
 427         tmp = ehci_readl(ehci, &ehci->regs->port_status[0]);
 428         tmp &= ~PORT_POWER;
 429         ehci_writel(ehci, tmp, &ehci->regs->port_status[0]);
 430
 431         return 0;
 432 }
 433
 434 static int ehci_fsl_mpc512x_drv_resume(struct device *dev)
 435 {
 436         struct usb_hcd *hcd = dev_get_drvdata(dev);
 437         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 438         struct fsl_usb2_platform_data *pdata = dev->platform_data;
 439         u32 tmp;
 440
 441         dev_dbg(dev, "suspend=%d already_suspended=%d\n",
 442                 pdata->suspended, pdata->already_suspended);
 443
 444         /*
 445          * If the controller was already suspended at suspend time,
 446          * then don't resume it now.
 447          */
 448         if (pdata->already_suspended) {
 449                 dev_dbg(dev, "already suspended, leaving early\n");
 450                 pdata->already_suspended = 0;
 451                 return 0;
 452         }
 453
 454         if (!pdata->suspended) {
 455                 dev_dbg(dev, "not suspended, leaving early\n");
 456                 return 0;
 457         }
 458
 459         pdata->suspended = 0;
 460
 461         dev_dbg(dev, "resuming...\n");
 462
 463         /* set host mode */
 464         tmp = USBMODE_CM_HOST | (pdata->es ? USBMODE_ES : 0);
 465         ehci_writel(ehci, tmp, hcd->regs + FSL_SOC_USB_USBMODE);
 466
 467         ehci_writel(ehci, pdata->pm_usbgenctrl,
 468                     hcd->regs + FSL_SOC_USB_USBGENCTRL);
 469         ehci_writel(ehci, ISIPHYCTRL_PXE | ISIPHYCTRL_PHYE,
 470                     hcd->regs + FSL_SOC_USB_ISIPHYCTRL);
 471
 472         /* restore EHCI registers */
 473         ehci_writel(ehci, pdata->pm_command, &ehci->regs->command);
 474         ehci_writel(ehci, pdata->pm_intr_enable, &ehci->regs->intr_enable);
 475         ehci_writel(ehci, pdata->pm_frame_index, &ehci->regs->frame_index);
 476         ehci_writel(ehci, pdata->pm_segment, &ehci->regs->segment);
 477         ehci_writel(ehci, pdata->pm_frame_list, &ehci->regs->frame_list);
 478         ehci_writel(ehci, pdata->pm_async_next, &ehci->regs->async_next);
 479         ehci_writel(ehci, pdata->pm_configured_flag,
 480                     &ehci->regs->configured_flag);
 481         ehci_writel(ehci, pdata->pm_portsc, &ehci->regs->port_status[0]);
 482
 483         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 484         ehci->rh_state = EHCI_RH_RUNNING;
 485         dev->power.power_state = PMSG_ON;
 486
 487         tmp = ehci_readl(ehci, &ehci->regs->command);
 488         tmp |= CMD_RUN;
 489         ehci_writel(ehci, tmp, &ehci->regs->command);
 490
 491         usb_hcd_resume_root_hub(hcd);
 492
 493         return 0;
 494 }
 495 #else
 496 static inline int ehci_fsl_mpc512x_drv_suspend(struct device *dev)
 497 {
 498         return 0;
 499 }
 500
 501 static inline int ehci_fsl_mpc512x_drv_resume(struct device *dev)
 502 {
 503         return 0;
 504 }
 505 #endif /* CONFIG_PPC_MPC512x */
 506
 507 static struct ehci_fsl *hcd_to_ehci_fsl(struct usb_hcd *hcd)
 508 {
 509         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 510
 511         return container_of(ehci, struct ehci_fsl, ehci);
 512 }
 513
 514 static int ehci_fsl_drv_suspend(struct device *dev)
 515 {
 516         struct usb_hcd *hcd = dev_get_drvdata(dev);
 517         struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd);
 518         void __iomem *non_ehci = hcd->regs;
 519
 520         if (of_device_is_compatible(dev->parent->of_node,
 521                                     "fsl,mpc5121-usb2-dr")) {
 522                 return ehci_fsl_mpc512x_drv_suspend(dev);
 523         }
 524
 525         ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd),
 526                         device_may_wakeup(dev));
 527         if (!fsl_deep_sleep())
 528                 return 0;
 529
 530         ehci_fsl->usb_ctrl = in_be32(non_ehci + FSL_SOC_USB_CTRL);
 531         return 0;
 532 }
 533
 534 static int ehci_fsl_drv_resume(struct device *dev)
 535 {
 536         struct usb_hcd *hcd = dev_get_drvdata(dev);
 537         struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd);
 538         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 539         void __iomem *non_ehci = hcd->regs;
 540
 541         if (of_device_is_compatible(dev->parent->of_node,
 542                                     "fsl,mpc5121-usb2-dr")) {
 543                 return ehci_fsl_mpc512x_drv_resume(dev);
 544         }
 545
 546         ehci_prepare_ports_for_controller_resume(ehci);
 547         if (!fsl_deep_sleep())
 548                 return 0;
 549
 550         usb_root_hub_lost_power(hcd->self.root_hub);
 551
 552         /* Restore USB PHY settings and enable the controller. */
 553         out_be32(non_ehci + FSL_SOC_USB_CTRL, ehci_fsl->usb_ctrl);
 554
 555         ehci_reset(ehci);
 556         ehci_fsl_reinit(ehci);
 557
 558         return 0;
 559 }
 560
 561 static int ehci_fsl_drv_restore(struct device *dev)
 562 {
 563         struct usb_hcd *hcd = dev_get_drvdata(dev);
 564
 565         usb_root_hub_lost_power(hcd->self.root_hub);
 566         return 0;
 567 }
 568
 569 static struct dev_pm_ops ehci_fsl_pm_ops = {
 570         .suspend = ehci_fsl_drv_suspend,
 571         .resume = ehci_fsl_drv_resume,
 572         .restore = ehci_fsl_drv_restore,
 573 };
 574
 575 #define EHCI_FSL_PM_OPS         (&ehci_fsl_pm_ops)
 576 #else
 577 #define EHCI_FSL_PM_OPS         NULL
 578 #endif /* CONFIG_PM */
 579
 580 #ifdef CONFIG_USB_OTG
 581 static int ehci_start_port_reset(struct usb_hcd *hcd, unsigned port)
 582 {
 583         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 584         u32 status;
 585
 586         if (!port)
 587                 return -EINVAL;
 588
 589         port--;
 590
 591         /* start port reset before HNP protocol time out */
 592         status = readl(&ehci->regs->port_status[port]);
 593         if (!(status & PORT_CONNECT))
 594                 return -ENODEV;
 595
 596         /* khubd will finish the reset later */
 597         if (ehci_is_TDI(ehci)) {
 598                 writel(PORT_RESET |
 599                        (status & ~(PORT_CSC | PORT_PEC | PORT_OCC)),
 600                        &ehci->regs->port_status[port]);
 601         } else {
 602                 writel(PORT_RESET, &ehci->regs->port_status[port]);
 603         }
 604
 605         return 0;
 606 }
 607 #else
 608 #define ehci_start_port_reset   NULL
 609 #endif /* CONFIG_USB_OTG */
 610
 611
 612 static const struct hc_driver ehci_fsl_hc_driver = {
 613         .description = hcd_name,
 614         .product_desc = "Freescale On-Chip EHCI Host Controller",
 615         .hcd_priv_size = sizeof(struct ehci_fsl),
 616
 617         /*
 618          * generic hardware linkage
 619          */
 620         .irq = ehci_irq,
 621         .flags = HCD_USB2 | HCD_MEMORY,
 622
 623         /*
 624          * basic lifecycle operations
 625          */
 626         .reset = ehci_fsl_setup,
 627         .start = ehci_run,
 628         .stop = ehci_stop,
 629         .shutdown = ehci_shutdown,
 630
 631         /*
 632          * managing i/o requests and associated device resources
 633          */
 634         .urb_enqueue = ehci_urb_enqueue,
 635         .urb_dequeue = ehci_urb_dequeue,
 636         .endpoint_disable = ehci_endpoint_disable,
 637         .endpoint_reset = ehci_endpoint_reset,
 638
 639         /*
 640          * scheduling support
 641          */
 642         .get_frame_number = ehci_get_frame,
 643
 644         /*
 645          * root hub support
 646          */
 647         .hub_status_data = ehci_hub_status_data,
 648         .hub_control = ehci_hub_control,
 649         .bus_suspend = ehci_bus_suspend,
 650         .bus_resume = ehci_bus_resume,
 651         .start_port_reset = ehci_start_port_reset,
 652         .relinquish_port = ehci_relinquish_port,
 653         .port_handed_over = ehci_port_handed_over,
 654
 655         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 656 };
 657
 658 static int ehci_fsl_drv_probe(struct platform_device *pdev)
 659 {
 660         if (usb_disabled())
 661                 return -ENODEV;
 662
 663         /* FIXME we only want one one probe() not two */
 664         return usb_hcd_fsl_probe(&ehci_fsl_hc_driver, pdev);
 665 }
 666
 667 static int ehci_fsl_drv_remove(struct platform_device *pdev)
 668 {
 669         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 670
 671         /* FIXME we only want one one remove() not two */
 672         usb_hcd_fsl_remove(hcd, pdev);
 673         return 0;
 674 }
 675
 676 MODULE_ALIAS("platform:fsl-ehci");
 677
 678 static struct platform_driver ehci_fsl_driver = {
 679         .probe = ehci_fsl_drv_probe,
 680         .remove = ehci_fsl_drv_remove,
 681         .shutdown = usb_hcd_platform_shutdown,
 682         .driver = {
 683                 .name = "fsl-ehci",
 684                 .pm = EHCI_FSL_PM_OPS,
 685         },
 686 };