drivers/usb/host/ohci-pxa27x.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   5  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
   6  * (C) Copyright 2002 Hewlett-Packard Company
   7  *
   8  * Bus Glue for pxa27x
   9  *
  10  * Written by Christopher Hoover <ch@hpl.hp.com>
  11  * Based on fragments of previous driver by Russell King et al.
  12  *
  13  * Modified for LH7A404 from ohci-sa1111.c
  14  *  by Durgesh Pattamatta <pattamattad@sharpsec.com>
  15  *
  16  * Modified for pxa27x from ohci-lh7a404.c
  17  *  by Nick Bane <nick@cecomputing.co.uk> 26-8-2004
  18  *
  19  * This file is licenced under the GPL.
  20  */
  21
  22 #include <linux/device.h>
  23 #include <linux/signal.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/clk.h>
  26 #include <linux/of_platform.h>
  27 #include <linux/of_gpio.h>
  28 #include <mach/hardware.h>
  29 #include <linux/platform_data/usb-ohci-pxa27x.h>
  30 #include <linux/platform_data/usb-pxa3xx-ulpi.h>
  31
  32 /*
  33  * UHC: USB Host Controller (OHCI-like) register definitions
  34  */
  35 #define UHCREV          (0x0000) /* UHC HCI Spec Revision */
  36 #define UHCHCON         (0x0004) /* UHC Host Control Register */
  37 #define UHCCOMS         (0x0008) /* UHC Command Status Register */
  38 #define UHCINTS         (0x000C) /* UHC Interrupt Status Register */
  39 #define UHCINTE         (0x0010) /* UHC Interrupt Enable */
  40 #define UHCINTD         (0x0014) /* UHC Interrupt Disable */
  41 #define UHCHCCA         (0x0018) /* UHC Host Controller Comm. Area */
  42 #define UHCPCED         (0x001C) /* UHC Period Current Endpt Descr */
  43 #define UHCCHED         (0x0020) /* UHC Control Head Endpt Descr */
  44 #define UHCCCED         (0x0024) /* UHC Control Current Endpt Descr */
  45 #define UHCBHED         (0x0028) /* UHC Bulk Head Endpt Descr */
  46 #define UHCBCED         (0x002C) /* UHC Bulk Current Endpt Descr */
  47 #define UHCDHEAD        (0x0030) /* UHC Done Head */
  48 #define UHCFMI          (0x0034) /* UHC Frame Interval */
  49 #define UHCFMR          (0x0038) /* UHC Frame Remaining */
  50 #define UHCFMN          (0x003C) /* UHC Frame Number */
  51 #define UHCPERS         (0x0040) /* UHC Periodic Start */
  52 #define UHCLS           (0x0044) /* UHC Low Speed Threshold */
  53
  54 #define UHCRHDA         (0x0048) /* UHC Root Hub Descriptor A */
  55 #define UHCRHDA_NOCP    (1 << 12)       /* No over current protection */
  56 #define UHCRHDA_OCPM    (1 << 11)       /* Over Current Protection Mode */
  57 #define UHCRHDA_POTPGT(x) \
  58                         (((x) & 0xff) << 24) /* Power On To Power Good Time */
  59
  60 #define UHCRHDB         (0x004C) /* UHC Root Hub Descriptor B */
  61 #define UHCRHS          (0x0050) /* UHC Root Hub Status */
  62 #define UHCRHPS1        (0x0054) /* UHC Root Hub Port 1 Status */
  63 #define UHCRHPS2        (0x0058) /* UHC Root Hub Port 2 Status */
  64 #define UHCRHPS3        (0x005C) /* UHC Root Hub Port 3 Status */
  65
  66 #define UHCSTAT         (0x0060) /* UHC Status Register */
  67 #define UHCSTAT_UPS3    (1 << 16)       /* USB Power Sense Port3 */
  68 #define UHCSTAT_SBMAI   (1 << 15)       /* System Bus Master Abort Interrupt*/
  69 #define UHCSTAT_SBTAI   (1 << 14)       /* System Bus Target Abort Interrupt*/
  70 #define UHCSTAT_UPRI    (1 << 13)       /* USB Port Resume Interrupt */
  71 #define UHCSTAT_UPS2    (1 << 12)       /* USB Power Sense Port 2 */
  72 #define UHCSTAT_UPS1    (1 << 11)       /* USB Power Sense Port 1 */
  73 #define UHCSTAT_HTA     (1 << 10)       /* HCI Target Abort */
  74 #define UHCSTAT_HBA     (1 << 8)        /* HCI Buffer Active */
  75 #define UHCSTAT_RWUE    (1 << 7)        /* HCI Remote Wake Up Event */
  76
  77 #define UHCHR           (0x0064) /* UHC Reset Register */
  78 #define UHCHR_SSEP3     (1 << 11)       /* Sleep Standby Enable for Port3 */
  79 #define UHCHR_SSEP2     (1 << 10)       /* Sleep Standby Enable for Port2 */
  80 #define UHCHR_SSEP1     (1 << 9)        /* Sleep Standby Enable for Port1 */
  81 #define UHCHR_PCPL      (1 << 7)        /* Power control polarity low */
  82 #define UHCHR_PSPL      (1 << 6)        /* Power sense polarity low */
  83 #define UHCHR_SSE       (1 << 5)        /* Sleep Standby Enable */
  84 #define UHCHR_UIT       (1 << 4)        /* USB Interrupt Test */
  85 #define UHCHR_SSDC      (1 << 3)        /* Simulation Scale Down Clock */
  86 #define UHCHR_CGR       (1 << 2)        /* Clock Generation Reset */
  87 #define UHCHR_FHR       (1 << 1)        /* Force Host Controller Reset */
  88 #define UHCHR_FSBIR     (1 << 0)        /* Force System Bus Iface Reset */
  89
  90 #define UHCHIE          (0x0068) /* UHC Interrupt Enable Register*/
  91 #define UHCHIE_UPS3IE   (1 << 14)       /* Power Sense Port3 IntEn */
  92 #define UHCHIE_UPRIE    (1 << 13)       /* Port Resume IntEn */
  93 #define UHCHIE_UPS2IE   (1 << 12)       /* Power Sense Port2 IntEn */
  94 #define UHCHIE_UPS1IE   (1 << 11)       /* Power Sense Port1 IntEn */
  95 #define UHCHIE_TAIE     (1 << 10)       /* HCI Interface Transfer Abort
  96                                            Interrupt Enable*/
  97 #define UHCHIE_HBAIE    (1 << 8)        /* HCI Buffer Active IntEn */
  98 #define UHCHIE_RWIE     (1 << 7)        /* Remote Wake-up IntEn */
  99
 100 #define UHCHIT          (0x006C) /* UHC Interrupt Test register */
 101
 102 #define PXA_UHC_MAX_PORTNUM    3
 103
 104 struct pxa27x_ohci {
 105         /* must be 1st member here for hcd_to_ohci() to work */
 106         struct ohci_hcd ohci;
 107
 108         struct device   *dev;
 109         struct clk      *clk;
 110         void __iomem    *mmio_base;
 111 };
 112
 113 #define to_pxa27x_ohci(hcd)     (struct pxa27x_ohci *)hcd_to_ohci(hcd)
 114
 115 /*
 116   PMM_NPS_MODE -- PMM Non-power switching mode
 117       Ports are powered continuously.
 118
 119   PMM_GLOBAL_MODE -- PMM global switching mode
 120       All ports are powered at the same time.
 121
 122   PMM_PERPORT_MODE -- PMM per port switching mode
 123       Ports are powered individually.
 124  */
 125 static int pxa27x_ohci_select_pmm(struct pxa27x_ohci *ohci, int mode)
 126 {
 127         uint32_t uhcrhda = __raw_readl(ohci->mmio_base + UHCRHDA);
 128         uint32_t uhcrhdb = __raw_readl(ohci->mmio_base + UHCRHDB);
 129
 130         switch (mode) {
 131         case PMM_NPS_MODE:
 132                 uhcrhda |= RH_A_NPS;
 133                 break;
 134         case PMM_GLOBAL_MODE:
 135                 uhcrhda &= ~(RH_A_NPS & RH_A_PSM);
 136                 break;
 137         case PMM_PERPORT_MODE:
 138                 uhcrhda &= ~(RH_A_NPS);
 139                 uhcrhda |= RH_A_PSM;
 140
 141                 /* Set port power control mask bits, only 3 ports. */
 142                 uhcrhdb |= (0x7<<17);
 143                 break;
 144         default:
 145                 printk( KERN_ERR
 146                         "Invalid mode %d, set to non-power switch mode.\n",
 147                         mode );
 148
 149                 uhcrhda |= RH_A_NPS;
 150         }
 151
 152         __raw_writel(uhcrhda, ohci->mmio_base + UHCRHDA);
 153         __raw_writel(uhcrhdb, ohci->mmio_base + UHCRHDB);
 154         return 0;
 155 }
 156
 157 extern int usb_disabled(void);
 158
 159 /*-------------------------------------------------------------------------*/
 160
 161 static inline void pxa27x_setup_hc(struct pxa27x_ohci *ohci,
 162                                    struct pxaohci_platform_data *inf)
 163 {
 164         uint32_t uhchr = __raw_readl(ohci->mmio_base + UHCHR);
 165         uint32_t uhcrhda = __raw_readl(ohci->mmio_base + UHCRHDA);
 166
 167         if (inf->flags & ENABLE_PORT1)
 168                 uhchr &= ~UHCHR_SSEP1;
 169
 170         if (inf->flags & ENABLE_PORT2)
 171                 uhchr &= ~UHCHR_SSEP2;
 172
 173         if (inf->flags & ENABLE_PORT3)
 174                 uhchr &= ~UHCHR_SSEP3;
 175
 176         if (inf->flags & POWER_CONTROL_LOW)
 177                 uhchr |= UHCHR_PCPL;
 178
 179         if (inf->flags & POWER_SENSE_LOW)
 180                 uhchr |= UHCHR_PSPL;
 181
 182         if (inf->flags & NO_OC_PROTECTION)
 183                 uhcrhda |= UHCRHDA_NOCP;
 184         else
 185                 uhcrhda &= ~UHCRHDA_NOCP;
 186
 187         if (inf->flags & OC_MODE_PERPORT)
 188                 uhcrhda |= UHCRHDA_OCPM;
 189         else
 190                 uhcrhda &= ~UHCRHDA_OCPM;
 191
 192         if (inf->power_on_delay) {
 193                 uhcrhda &= ~UHCRHDA_POTPGT(0xff);
 194                 uhcrhda |= UHCRHDA_POTPGT(inf->power_on_delay / 2);
 195         }
 196
 197         __raw_writel(uhchr, ohci->mmio_base + UHCHR);
 198         __raw_writel(uhcrhda, ohci->mmio_base + UHCRHDA);
 199 }
 200
 201 static inline void pxa27x_reset_hc(struct pxa27x_ohci *ohci)
 202 {
 203         uint32_t uhchr = __raw_readl(ohci->mmio_base + UHCHR);
 204
 205         __raw_writel(uhchr | UHCHR_FHR, ohci->mmio_base + UHCHR);
 206         udelay(11);
 207         __raw_writel(uhchr & ~UHCHR_FHR, ohci->mmio_base + UHCHR);
 208 }
 209
 210 #ifdef CONFIG_PXA27x
 211 extern void pxa27x_clear_otgph(void);
 212 #else
 213 #define pxa27x_clear_otgph()    do {} while (0)
 214 #endif
 215
 216 static int pxa27x_start_hc(struct pxa27x_ohci *ohci, struct device *dev)
 217 {
 218         int retval = 0;
 219         struct pxaohci_platform_data *inf;
 220         uint32_t uhchr;
 221
 222         inf = dev_get_platdata(dev);
 223
 224         clk_prepare_enable(ohci->clk);
 225
 226         pxa27x_reset_hc(ohci);
 227
 228         uhchr = __raw_readl(ohci->mmio_base + UHCHR) | UHCHR_FSBIR;
 229         __raw_writel(uhchr, ohci->mmio_base + UHCHR);
 230
 231         while (__raw_readl(ohci->mmio_base + UHCHR) & UHCHR_FSBIR)
 232                 cpu_relax();
 233
 234         pxa27x_setup_hc(ohci, inf);
 235
 236         if (inf->init)
 237                 retval = inf->init(dev);
 238
 239         if (retval < 0)
 240                 return retval;
 241
 242         if (cpu_is_pxa3xx())
 243                 pxa3xx_u2d_start_hc(&ohci_to_hcd(&ohci->ohci)->self);
 244
 245         uhchr = __raw_readl(ohci->mmio_base + UHCHR) & ~UHCHR_SSE;
 246         __raw_writel(uhchr, ohci->mmio_base + UHCHR);
 247         __raw_writel(UHCHIE_UPRIE | UHCHIE_RWIE, ohci->mmio_base + UHCHIE);
 248
 249         /* Clear any OTG Pin Hold */
 250         pxa27x_clear_otgph();
 251         return 0;
 252 }
 253
 254 static void pxa27x_stop_hc(struct pxa27x_ohci *ohci, struct device *dev)
 255 {
 256         struct pxaohci_platform_data *inf;
 257         uint32_t uhccoms;
 258
 259         inf = dev_get_platdata(dev);
 260
 261         if (cpu_is_pxa3xx())
 262                 pxa3xx_u2d_stop_hc(&ohci_to_hcd(&ohci->ohci)->self);
 263
 264         if (inf->exit)
 265                 inf->exit(dev);
 266
 267         pxa27x_reset_hc(ohci);
 268
 269         /* Host Controller Reset */
 270         uhccoms = __raw_readl(ohci->mmio_base + UHCCOMS) | 0x01;
 271         __raw_writel(uhccoms, ohci->mmio_base + UHCCOMS);
 272         udelay(10);
 273
 274         clk_disable_unprepare(ohci->clk);
 275 }
 276
 277 #ifdef CONFIG_OF
 278 static const struct of_device_id pxa_ohci_dt_ids[] = {
 279         { .compatible = "marvell,pxa-ohci" },
 280         { }
 281 };
 282
 283 MODULE_DEVICE_TABLE(of, pxa_ohci_dt_ids);
 284
 285 static int ohci_pxa_of_init(struct platform_device *pdev)
 286 {
 287         struct device_node *np = pdev->dev.of_node;
 288         struct pxaohci_platform_data *pdata;
 289         u32 tmp;
 290
 291         if (!np)
 292                 return 0;
 293
 294         /* Right now device-tree probed devices don't get dma_mask set.
 295          * Since shared usb code relies on it, set it here for now.
 296          * Once we have dma capability bindings this can go away.
 297          */
 298         if (!pdev->dev.dma_mask)
 299                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 300         if (!pdev->dev.coherent_dma_mask)
 301                 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 302
 303         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 304         if (!pdata)
 305                 return -ENOMEM;
 306
 307         if (of_get_property(np, "marvell,enable-port1", NULL))
 308                 pdata->flags |= ENABLE_PORT1;
 309         if (of_get_property(np, "marvell,enable-port2", NULL))
 310                 pdata->flags |= ENABLE_PORT2;
 311         if (of_get_property(np, "marvell,enable-port3", NULL))
 312                 pdata->flags |= ENABLE_PORT3;
 313         if (of_get_property(np, "marvell,port-sense-low", NULL))
 314                 pdata->flags |= POWER_SENSE_LOW;
 315         if (of_get_property(np, "marvell,power-control-low", NULL))
 316                 pdata->flags |= POWER_CONTROL_LOW;
 317         if (of_get_property(np, "marvell,no-oc-protection", NULL))
 318                 pdata->flags |= NO_OC_PROTECTION;
 319         if (of_get_property(np, "marvell,oc-mode-perport", NULL))
 320                 pdata->flags |= OC_MODE_PERPORT;
 321         if (!of_property_read_u32(np, "marvell,power-on-delay", &tmp))
 322                 pdata->power_on_delay = tmp;
 323         if (!of_property_read_u32(np, "marvell,port-mode", &tmp))
 324                 pdata->port_mode = tmp;
 325         if (!of_property_read_u32(np, "marvell,power-budget", &tmp))
 326                 pdata->power_budget = tmp;
 327
 328         pdev->dev.platform_data = pdata;
 329
 330         return 0;
 331 }
 332 #else
 333 static int ohci_pxa_of_init(struct platform_device *pdev)
 334 {
 335         return 0;
 336 }
 337 #endif
 338
 339 /*-------------------------------------------------------------------------*/
 340
 341 /* configure so an HC device and id are always provided */
 342 /* always called with process context; sleeping is OK */
 343
 344
 345 /**
 346  * usb_hcd_pxa27x_probe - initialize pxa27x-based HCDs
 347  * Context: !in_interrupt()
 348  *
 349  * Allocates basic resources for this USB host controller, and
 350  * then invokes the start() method for the HCD associated with it
 351  * through the hotplug entry's driver_data.
 352  *
 353  */
 354 int usb_hcd_pxa27x_probe (const struct hc_driver *driver, struct platform_device *pdev)
 355 {
 356         int retval, irq;
 357         struct usb_hcd *hcd;
 358         struct pxaohci_platform_data *inf;
 359         struct pxa27x_ohci *ohci;
 360         struct resource *r;
 361         struct clk *usb_clk;
 362
 363         retval = ohci_pxa_of_init(pdev);
 364         if (retval)
 365                 return retval;
 366
 367         inf = dev_get_platdata(&pdev->dev);
 368
 369         if (!inf)
 370                 return -ENODEV;
 371
 372         irq = platform_get_irq(pdev, 0);
 373         if (irq < 0) {
 374                 pr_err("no resource of IORESOURCE_IRQ");
 375                 return -ENXIO;
 376         }
 377
 378         usb_clk = clk_get(&pdev->dev, NULL);
 379         if (IS_ERR(usb_clk))
 380                 return PTR_ERR(usb_clk);
 381
 382         hcd = usb_create_hcd (driver, &pdev->dev, "pxa27x");
 383         if (!hcd) {
 384                 retval = -ENOMEM;
 385                 goto err0;
 386         }
 387
 388         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 389         if (!r) {
 390                 pr_err("no resource of IORESOURCE_MEM");
 391                 retval = -ENXIO;
 392                 goto err1;
 393         }
 394
 395         hcd->rsrc_start = r->start;
 396         hcd->rsrc_len = resource_size(r);
 397
 398         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 399                 pr_debug("request_mem_region failed");
 400                 retval = -EBUSY;
 401                 goto err1;
 402         }
 403
 404         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 405         if (!hcd->regs) {
 406                 pr_debug("ioremap failed");
 407                 retval = -ENOMEM;
 408                 goto err2;
 409         }
 410
 411         /* initialize "struct pxa27x_ohci" */
 412         ohci = (struct pxa27x_ohci *)hcd_to_ohci(hcd);
 413         ohci->dev = &pdev->dev;
 414         ohci->clk = usb_clk;
 415         ohci->mmio_base = (void __iomem *)hcd->regs;
 416
 417         if ((retval = pxa27x_start_hc(ohci, &pdev->dev)) < 0) {
 418                 pr_debug("pxa27x_start_hc failed");
 419                 goto err3;
 420         }
 421
 422         /* Select Power Management Mode */
 423         pxa27x_ohci_select_pmm(ohci, inf->port_mode);
 424
 425         if (inf->power_budget)
 426                 hcd->power_budget = inf->power_budget;
 427
 428         ohci_hcd_init(hcd_to_ohci(hcd));
 429
 430         retval = usb_add_hcd(hcd, irq, 0);
 431         if (retval == 0)
 432                 return retval;
 433
 434         pxa27x_stop_hc(ohci, &pdev->dev);
 435  err3:
 436         iounmap(hcd->regs);
 437  err2:
 438         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 439  err1:
 440         usb_put_hcd(hcd);
 441  err0:
 442         clk_put(usb_clk);
 443         return retval;
 444 }
 445
 446
 447 /* may be called without controller electrically present */
 448 /* may be called with controller, bus, and devices active */
 449
 450 /**
 451  * usb_hcd_pxa27x_remove - shutdown processing for pxa27x-based HCDs
 452  * @dev: USB Host Controller being removed
 453  * Context: !in_interrupt()
 454  *
 455  * Reverses the effect of usb_hcd_pxa27x_probe(), first invoking
 456  * the HCD's stop() method.  It is always called from a thread
 457  * context, normally "rmmod", "apmd", or something similar.
 458  *
 459  */
 460 void usb_hcd_pxa27x_remove (struct usb_hcd *hcd, struct platform_device *pdev)
 461 {
 462         struct pxa27x_ohci *ohci = to_pxa27x_ohci(hcd);
 463
 464         usb_remove_hcd(hcd);
 465         pxa27x_stop_hc(ohci, &pdev->dev);
 466         iounmap(hcd->regs);
 467         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 468         usb_put_hcd(hcd);
 469         clk_put(ohci->clk);
 470 }
 471
 472 /*-------------------------------------------------------------------------*/
 473
 474 static int
 475 ohci_pxa27x_start (struct usb_hcd *hcd)
 476 {
 477         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 478         int             ret;
 479
 480         ohci_dbg (ohci, "ohci_pxa27x_start, ohci:%p", ohci);
 481
 482         /* The value of NDP in roothub_a is incorrect on this hardware */
 483         ohci->num_ports = 3;
 484
 485         if ((ret = ohci_init(ohci)) < 0)
 486                 return ret;
 487
 488         if ((ret = ohci_run (ohci)) < 0) {
 489                 dev_err(hcd->self.controller, "can't start %s",
 490                         hcd->self.bus_name);
 491                 ohci_stop (hcd);
 492                 return ret;
 493         }
 494
 495         return 0;
 496 }
 497
 498 /*-------------------------------------------------------------------------*/
 499
 500 static const struct hc_driver ohci_pxa27x_hc_driver = {
 501         .description =          hcd_name,
 502         .product_desc =         "PXA27x OHCI",
 503         .hcd_priv_size =        sizeof(struct pxa27x_ohci),
 504
 505         /*
 506          * generic hardware linkage
 507          */
 508         .irq =                  ohci_irq,
 509         .flags =                HCD_USB11 | HCD_MEMORY,
 510
 511         /*
 512          * basic lifecycle operations
 513          */
 514         .start =                ohci_pxa27x_start,
 515         .stop =                 ohci_stop,
 516         .shutdown =             ohci_shutdown,
 517
 518         /*
 519          * managing i/o requests and associated device resources
 520          */
 521         .urb_enqueue =          ohci_urb_enqueue,
 522         .urb_dequeue =          ohci_urb_dequeue,
 523         .endpoint_disable =     ohci_endpoint_disable,
 524
 525         /*
 526          * scheduling support
 527          */
 528         .get_frame_number =     ohci_get_frame,
 529
 530         /*
 531          * root hub support
 532          */
 533         .hub_status_data =      ohci_hub_status_data,
 534         .hub_control =          ohci_hub_control,
 535 #ifdef  CONFIG_PM
 536         .bus_suspend =          ohci_bus_suspend,
 537         .bus_resume =           ohci_bus_resume,
 538 #endif
 539         .start_port_reset =     ohci_start_port_reset,
 540 };
 541
 542 /*-------------------------------------------------------------------------*/
 543
 544 static int ohci_hcd_pxa27x_drv_probe(struct platform_device *pdev)
 545 {
 546         pr_debug ("In ohci_hcd_pxa27x_drv_probe");
 547
 548         if (usb_disabled())
 549                 return -ENODEV;
 550
 551         return usb_hcd_pxa27x_probe(&ohci_pxa27x_hc_driver, pdev);
 552 }
 553
 554 static int ohci_hcd_pxa27x_drv_remove(struct platform_device *pdev)
 555 {
 556         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 557
 558         usb_hcd_pxa27x_remove(hcd, pdev);
 559         return 0;
 560 }
 561
 562 #ifdef CONFIG_PM
 563 static int ohci_hcd_pxa27x_drv_suspend(struct device *dev)
 564 {
 565         struct usb_hcd *hcd = dev_get_drvdata(dev);
 566         struct pxa27x_ohci *ohci = to_pxa27x_ohci(hcd);
 567
 568         if (time_before(jiffies, ohci->ohci.next_statechange))
 569                 msleep(5);
 570         ohci->ohci.next_statechange = jiffies;
 571
 572         pxa27x_stop_hc(ohci, dev);
 573         return 0;
 574 }
 575
 576 static int ohci_hcd_pxa27x_drv_resume(struct device *dev)
 577 {
 578         struct usb_hcd *hcd = dev_get_drvdata(dev);
 579         struct pxa27x_ohci *ohci = to_pxa27x_ohci(hcd);
 580         struct pxaohci_platform_data *inf = dev_get_platdata(dev);
 581         int status;
 582
 583         if (time_before(jiffies, ohci->ohci.next_statechange))
 584                 msleep(5);
 585         ohci->ohci.next_statechange = jiffies;
 586
 587         if ((status = pxa27x_start_hc(ohci, dev)) < 0)
 588                 return status;
 589
 590         /* Select Power Management Mode */
 591         pxa27x_ohci_select_pmm(ohci, inf->port_mode);
 592
 593         ohci_resume(hcd, false);
 594         return 0;
 595 }
 596
 597 static const struct dev_pm_ops ohci_hcd_pxa27x_pm_ops = {
 598         .suspend        = ohci_hcd_pxa27x_drv_suspend,
 599         .resume         = ohci_hcd_pxa27x_drv_resume,
 600 };
 601 #endif
 602
 603 /* work with hotplug and coldplug */
 604 MODULE_ALIAS("platform:pxa27x-ohci");
 605
 606 static struct platform_driver ohci_hcd_pxa27x_driver = {
 607         .probe          = ohci_hcd_pxa27x_drv_probe,
 608         .remove         = ohci_hcd_pxa27x_drv_remove,
 609         .shutdown       = usb_hcd_platform_shutdown,
 610         .driver         = {
 611                 .name   = "pxa27x-ohci",
 612                 .owner  = THIS_MODULE,
 613                 .of_match_table = of_match_ptr(pxa_ohci_dt_ids),
 614 #ifdef CONFIG_PM
 615                 .pm     = &ohci_hcd_pxa27x_pm_ops,
 616 #endif
 617         },
 618 };
 619