drivers/usb/host/sl811-hcd.c

   1 /*
   2  * SL811HS HCD (Host Controller Driver) for USB.
   3  *
   4  * Copyright (C) 2004 Psion Teklogix (for NetBook PRO)
   5  * Copyright (C) 2004-2005 David Brownell
   6  *
   7  * Periodic scheduling is based on Roman's OHCI code
   8  *      Copyright (C) 1999 Roman Weissgaerber
   9  *
  10  * The SL811HS controller handles host side USB (like the SL11H, but with
  11  * another register set and SOF generation) as well as peripheral side USB
  12  * (like the SL811S).  This driver version doesn't implement the Gadget API
  13  * for the peripheral role; or OTG (that'd need much external circuitry).
  14  *
  15  * For documentation, see the SL811HS spec and the "SL811HS Embedded Host"
  16  * document (providing significant pieces missing from that spec); plus
  17  * the SL811S spec if you want peripheral side info.
  18  */
  19
  20 /*
  21  * Status:  Passed basic stress testing, works with hubs, mice, keyboards,
  22  * and usb-storage.
  23  *
  24  * TODO:
  25  * - usb suspend/resume triggered by sl811 (with USB_SUSPEND)
  26  * - various issues noted in the code
  27  * - performance work; use both register banks; ...
  28  * - use urb->iso_frame_desc[] with ISO transfers
  29  */
  30
  31 #undef  VERBOSE
  32 #undef  PACKET_TRACE
  33
  34 #include <linux/module.h>
  35 #include <linux/moduleparam.h>
  36 #include <linux/kernel.h>
  37 #include <linux/delay.h>
  38 #include <linux/ioport.h>
  39 #include <linux/sched.h>
  40 #include <linux/slab.h>
  41 #include <linux/smp_lock.h>
  42 #include <linux/errno.h>
  43 #include <linux/init.h>
  44 #include <linux/timer.h>
  45 #include <linux/list.h>
  46 #include <linux/interrupt.h>
  47 #include <linux/usb.h>
  48 #include <linux/usb/sl811.h>
  49 #include <linux/platform_device.h>
  50
  51 #include <asm/io.h>
  52 #include <asm/irq.h>
  53 #include <asm/system.h>
  54 #include <asm/byteorder.h>
  55
  56 #include "../core/hcd.h"
  57 #include "sl811.h"
  58
  59
  60 MODULE_DESCRIPTION("SL811HS USB Host Controller Driver");
  61 MODULE_LICENSE("GPL");
  62
  63 #define DRIVER_VERSION  "19 May 2005"
  64
  65
  66 #ifndef DEBUG
  67 #       define  STUB_DEBUG_FILE
  68 #endif
  69
  70 /* for now, use only one transfer register bank */
  71 #undef  USE_B
  72
  73 /* this doesn't understand urb->iso_frame_desc[], but if you had a driver
  74  * that just queued one ISO frame per URB then iso transfers "should" work
  75  * using the normal urb status fields.
  76  */
  77 #define DISABLE_ISO
  78
  79 // #define      QUIRK2
  80 #define QUIRK3
  81
  82 static const char hcd_name[] = "sl811-hcd";
  83
  84 /*-------------------------------------------------------------------------*/
  85
  86 static void port_power(struct sl811 *sl811, int is_on)
  87 {
  88         struct usb_hcd  *hcd = sl811_to_hcd(sl811);
  89
  90         /* hub is inactive unless the port is powered */
  91         if (is_on) {
  92                 if (sl811->port1 & (1 << USB_PORT_FEAT_POWER))
  93                         return;
  94
  95                 sl811->port1 = (1 << USB_PORT_FEAT_POWER);
  96                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
  97                 hcd->self.controller->power.power_state = PMSG_ON;
  98         } else {
  99                 sl811->port1 = 0;
 100                 sl811->irq_enable = 0;
 101                 hcd->state = HC_STATE_HALT;
 102                 hcd->self.controller->power.power_state = PMSG_SUSPEND;
 103         }
 104         sl811->ctrl1 = 0;
 105         sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
 106         sl811_write(sl811, SL11H_IRQ_STATUS, ~0);
 107
 108         if (sl811->board && sl811->board->port_power) {
 109                 /* switch VBUS, at 500mA unless hub power budget gets set */
 110                 DBG("power %s\n", is_on ? "on" : "off");
 111                 sl811->board->port_power(hcd->self.controller, is_on);
 112         }
 113
 114         /* reset as thoroughly as we can */
 115         if (sl811->board && sl811->board->reset)
 116                 sl811->board->reset(hcd->self.controller);
 117         else {
 118                 sl811_write(sl811, SL11H_CTLREG1, SL11H_CTL1MASK_SE0);
 119                 mdelay(20);
 120         }
 121
 122         sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
 123         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
 124         sl811_write(sl811, SL811HS_CTLREG2, SL811HS_CTL2_INIT);
 125         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 126
 127         // if !is_on, put into lowpower mode now
 128 }
 129
 130 /*-------------------------------------------------------------------------*/
 131
 132 /* This is a PIO-only HCD.  Queueing appends URBs to the endpoint's queue,
 133  * and may start I/O.  Endpoint queues are scanned during completion irq
 134  * handlers (one per packet: ACK, NAK, faults, etc) and urb cancellation.
 135  *
 136  * Using an external DMA engine to copy a packet at a time could work,
 137  * though setup/teardown costs may be too big to make it worthwhile.
 138  */
 139
 140 /* SETUP starts a new control request.  Devices are not allowed to
 141  * STALL or NAK these; they must cancel any pending control requests.
 142  */
 143 static void setup_packet(
 144         struct sl811            *sl811,
 145         struct sl811h_ep        *ep,
 146         struct urb              *urb,
 147         u8                      bank,
 148         u8                      control
 149 )
 150 {
 151         u8                      addr;
 152         u8                      len;
 153         void __iomem            *data_reg;
 154
 155         addr = SL811HS_PACKET_BUF(bank == 0);
 156         len = sizeof(struct usb_ctrlrequest);
 157         data_reg = sl811->data_reg;
 158         sl811_write_buf(sl811, addr, urb->setup_packet, len);
 159
 160         /* autoincrementing */
 161         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
 162         writeb(len, data_reg);
 163         writeb(SL_SETUP /* | ep->epnum */, data_reg);
 164         writeb(usb_pipedevice(urb->pipe), data_reg);
 165
 166         /* always OUT/data0 */ ;
 167         sl811_write(sl811, bank + SL11H_HOSTCTLREG,
 168                         control | SL11H_HCTLMASK_OUT);
 169         ep->length = 0;
 170         PACKET("SETUP qh%p\n", ep);
 171 }
 172
 173 /* STATUS finishes control requests, often after IN or OUT data packets */
 174 static void status_packet(
 175         struct sl811            *sl811,
 176         struct sl811h_ep        *ep,
 177         struct urb              *urb,
 178         u8                      bank,
 179         u8                      control
 180 )
 181 {
 182         int                     do_out;
 183         void __iomem            *data_reg;
 184
 185         do_out = urb->transfer_buffer_length && usb_pipein(urb->pipe);
 186         data_reg = sl811->data_reg;
 187
 188         /* autoincrementing */
 189         sl811_write(sl811, bank + SL11H_BUFADDRREG, 0);
 190         writeb(0, data_reg);
 191         writeb((do_out ? SL_OUT : SL_IN) /* | ep->epnum */, data_reg);
 192         writeb(usb_pipedevice(urb->pipe), data_reg);
 193
 194         /* always data1; sometimes IN */
 195         control |= SL11H_HCTLMASK_TOGGLE;
 196         if (do_out)
 197                 control |= SL11H_HCTLMASK_OUT;
 198         sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
 199         ep->length = 0;
 200         PACKET("STATUS%s/%s qh%p\n", ep->nak_count ? "/retry" : "",
 201                         do_out ? "out" : "in", ep);
 202 }
 203
 204 /* IN packets can be used with any type of endpoint. here we just
 205  * start the transfer, data from the peripheral may arrive later.
 206  * urb->iso_frame_desc is currently ignored here...
 207  */
 208 static void in_packet(
 209         struct sl811            *sl811,
 210         struct sl811h_ep        *ep,
 211         struct urb              *urb,
 212         u8                      bank,
 213         u8                      control
 214 )
 215 {
 216         u8                      addr;
 217         u8                      len;
 218         void __iomem            *data_reg;
 219
 220         /* avoid losing data on overflow */
 221         len = ep->maxpacket;
 222         addr = SL811HS_PACKET_BUF(bank == 0);
 223         if (!(control & SL11H_HCTLMASK_ISOCH)
 224                         && usb_gettoggle(urb->dev, ep->epnum, 0))
 225                 control |= SL11H_HCTLMASK_TOGGLE;
 226         data_reg = sl811->data_reg;
 227
 228         /* autoincrementing */
 229         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
 230         writeb(len, data_reg);
 231         writeb(SL_IN | ep->epnum, data_reg);
 232         writeb(usb_pipedevice(urb->pipe), data_reg);
 233
 234         sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
 235         ep->length = min((int)len,
 236                         urb->transfer_buffer_length - urb->actual_length);
 237         PACKET("IN%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
 238                         !!usb_gettoggle(urb->dev, ep->epnum, 0), ep, len);
 239 }
 240
 241 /* OUT packets can be used with any type of endpoint.
 242  * urb->iso_frame_desc is currently ignored here...
 243  */
 244 static void out_packet(
 245         struct sl811            *sl811,
 246         struct sl811h_ep        *ep,
 247         struct urb              *urb,
 248         u8                      bank,
 249         u8                      control
 250 )
 251 {
 252         void                    *buf;
 253         u8                      addr;
 254         u8                      len;
 255         void __iomem            *data_reg;
 256
 257         buf = urb->transfer_buffer + urb->actual_length;
 258         prefetch(buf);
 259
 260         len = min((int)ep->maxpacket,
 261                         urb->transfer_buffer_length - urb->actual_length);
 262
 263         if (!(control & SL11H_HCTLMASK_ISOCH)
 264                         && usb_gettoggle(urb->dev, ep->epnum, 1))
 265                 control |= SL11H_HCTLMASK_TOGGLE;
 266         addr = SL811HS_PACKET_BUF(bank == 0);
 267         data_reg = sl811->data_reg;
 268
 269         sl811_write_buf(sl811, addr, buf, len);
 270
 271         /* autoincrementing */
 272         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
 273         writeb(len, data_reg);
 274         writeb(SL_OUT | ep->epnum, data_reg);
 275         writeb(usb_pipedevice(urb->pipe), data_reg);
 276
 277         sl811_write(sl811, bank + SL11H_HOSTCTLREG,
 278                         control | SL11H_HCTLMASK_OUT);
 279         ep->length = len;
 280         PACKET("OUT%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
 281                         !!usb_gettoggle(urb->dev, ep->epnum, 1), ep, len);
 282 }
 283
 284 /*-------------------------------------------------------------------------*/
 285
 286 /* caller updates on-chip enables later */
 287
 288 static inline void sofirq_on(struct sl811 *sl811)
 289 {
 290         if (sl811->irq_enable & SL11H_INTMASK_SOFINTR)
 291                 return;
 292         VDBG("sof irq on\n");
 293         sl811->irq_enable |= SL11H_INTMASK_SOFINTR;
 294 }
 295
 296 static inline void sofirq_off(struct sl811 *sl811)
 297 {
 298         if (!(sl811->irq_enable & SL11H_INTMASK_SOFINTR))
 299                 return;
 300         VDBG("sof irq off\n");
 301         sl811->irq_enable &= ~SL11H_INTMASK_SOFINTR;
 302 }
 303
 304 /*-------------------------------------------------------------------------*/
 305
 306 /* pick the next endpoint for a transaction, and issue it.
 307  * frames start with periodic transfers (after whatever is pending
 308  * from the previous frame), and the rest of the time is async
 309  * transfers, scheduled round-robin.
 310  */
 311 static struct sl811h_ep *start(struct sl811 *sl811, u8 bank)
 312 {
 313         struct sl811h_ep        *ep;
 314         struct urb              *urb;
 315         int                     fclock;
 316         u8                      control;
 317
 318         /* use endpoint at schedule head */
 319         if (sl811->next_periodic) {
 320                 ep = sl811->next_periodic;
 321                 sl811->next_periodic = ep->next;
 322         } else {
 323                 if (sl811->next_async)
 324                         ep = sl811->next_async;
 325                 else if (!list_empty(&sl811->async))
 326                         ep = container_of(sl811->async.next,
 327                                         struct sl811h_ep, schedule);
 328                 else {
 329                         /* could set up the first fullspeed periodic
 330                          * transfer for the next frame ...
 331                          */
 332                         return NULL;
 333                 }
 334
 335 #ifdef USE_B
 336                 if ((bank && sl811->active_b == ep) || sl811->active_a == ep)
 337                         return NULL;
 338 #endif
 339
 340                 if (ep->schedule.next == &sl811->async)
 341                         sl811->next_async = NULL;
 342                 else
 343                         sl811->next_async = container_of(ep->schedule.next,
 344                                         struct sl811h_ep, schedule);
 345         }
 346
 347         if (unlikely(list_empty(&ep->hep->urb_list))) {
 348                 DBG("empty %p queue?\n", ep);
 349                 return NULL;
 350         }
 351
 352         urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
 353         control = ep->defctrl;
 354
 355         /* if this frame doesn't have enough time left to transfer this
 356          * packet, wait till the next frame.  too-simple algorithm...
 357          */
 358         fclock = sl811_read(sl811, SL11H_SOFTMRREG) << 6;
 359         fclock -= 100;          /* setup takes not much time */
 360         if (urb->dev->speed == USB_SPEED_LOW) {
 361                 if (control & SL11H_HCTLMASK_PREAMBLE) {
 362                         /* also note erratum 1: some hubs won't work */
 363                         fclock -= 800;
 364                 }
 365                 fclock -= ep->maxpacket << 8;
 366
 367                 /* erratum 2: AFTERSOF only works for fullspeed */
 368                 if (fclock < 0) {
 369                         if (ep->period)
 370                                 sl811->stat_overrun++;
 371                         sofirq_on(sl811);
 372                         return NULL;
 373                 }
 374         } else {
 375                 fclock -= 12000 / 19;   /* 19 64byte packets/msec */
 376                 if (fclock < 0) {
 377                         if (ep->period)
 378                                 sl811->stat_overrun++;
 379                         control |= SL11H_HCTLMASK_AFTERSOF;
 380
 381                 /* throttle bulk/control irq noise */
 382                 } else if (ep->nak_count)
 383                         control |= SL11H_HCTLMASK_AFTERSOF;
 384         }
 385
 386
 387         switch (ep->nextpid) {
 388         case USB_PID_IN:
 389                 in_packet(sl811, ep, urb, bank, control);
 390                 break;
 391         case USB_PID_OUT:
 392                 out_packet(sl811, ep, urb, bank, control);
 393                 break;
 394         case USB_PID_SETUP:
 395                 setup_packet(sl811, ep, urb, bank, control);
 396                 break;
 397         case USB_PID_ACK:               /* for control status */
 398                 status_packet(sl811, ep, urb, bank, control);
 399                 break;
 400         default:
 401                 DBG("bad ep%p pid %02x\n", ep, ep->nextpid);
 402                 ep = NULL;
 403         }
 404         return ep;
 405 }
 406
 407 #define MIN_JIFFIES     ((msecs_to_jiffies(2) > 1) ? msecs_to_jiffies(2) : 2)
 408
 409 static inline void start_transfer(struct sl811 *sl811)
 410 {
 411         if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND))
 412                 return;
 413         if (sl811->active_a == NULL) {
 414                 sl811->active_a = start(sl811, SL811_EP_A(SL811_HOST_BUF));
 415                 if (sl811->active_a != NULL)
 416                         sl811->jiffies_a = jiffies + MIN_JIFFIES;
 417         }
 418 #ifdef USE_B
 419         if (sl811->active_b == NULL) {
 420                 sl811->active_b = start(sl811, SL811_EP_B(SL811_HOST_BUF));
 421                 if (sl811->active_b != NULL)
 422                         sl811->jiffies_b = jiffies + MIN_JIFFIES;
 423         }
 424 #endif
 425 }
 426
 427 static void finish_request(
 428         struct sl811            *sl811,
 429         struct sl811h_ep        *ep,
 430         struct urb              *urb,
 431         int                     status
 432 ) __releases(sl811->lock) __acquires(sl811->lock)
 433 {
 434         unsigned                i;
 435
 436         if (usb_pipecontrol(urb->pipe))
 437                 ep->nextpid = USB_PID_SETUP;
 438
 439         spin_lock(&urb->lock);
 440         if (urb->status == -EINPROGRESS)
 441                 urb->status = status;
 442         urb->hcpriv = NULL;
 443         spin_unlock(&urb->lock);
 444
 445         spin_unlock(&sl811->lock);
 446         usb_hcd_giveback_urb(sl811_to_hcd(sl811), urb);
 447         spin_lock(&sl811->lock);
 448
 449         /* leave active endpoints in the schedule */
 450         if (!list_empty(&ep->hep->urb_list))
 451                 return;
 452
 453         /* async deschedule? */
 454         if (!list_empty(&ep->schedule)) {
 455                 list_del_init(&ep->schedule);
 456                 if (ep == sl811->next_async)
 457                         sl811->next_async = NULL;
 458                 return;
 459         }
 460
 461         /* periodic deschedule */
 462         DBG("deschedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
 463         for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
 464                 struct sl811h_ep        *temp;
 465                 struct sl811h_ep        **prev = &sl811->periodic[i];
 466
 467                 while (*prev && ((temp = *prev) != ep))
 468                         prev = &temp->next;
 469                 if (*prev)
 470                         *prev = ep->next;
 471                 sl811->load[i] -= ep->load;
 472         }
 473         ep->branch = PERIODIC_SIZE;
 474         sl811->periodic_count--;
 475         sl811_to_hcd(sl811)->self.bandwidth_allocated
 476                 -= ep->load / ep->period;
 477         if (ep == sl811->next_periodic)
 478                 sl811->next_periodic = ep->next;
 479
 480         /* we might turn SOFs back on again for the async schedule */
 481         if (sl811->periodic_count == 0)
 482                 sofirq_off(sl811);
 483 }
 484
 485 static void
 486 done(struct sl811 *sl811, struct sl811h_ep *ep, u8 bank)
 487 {
 488         u8                      status;
 489         struct urb              *urb;
 490         int                     urbstat = -EINPROGRESS;
 491
 492         if (unlikely(!ep))
 493                 return;
 494
 495         status = sl811_read(sl811, bank + SL11H_PKTSTATREG);
 496
 497         urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
 498
 499         /* we can safely ignore NAKs */
 500         if (status & SL11H_STATMASK_NAK) {
 501                 // PACKET("...NAK_%02x qh%p\n", bank, ep);
 502                 if (!ep->period)
 503                         ep->nak_count++;
 504                 ep->error_count = 0;
 505
 506         /* ACK advances transfer, toggle, and maybe queue */
 507         } else if (status & SL11H_STATMASK_ACK) {
 508                 struct usb_device       *udev = urb->dev;
 509                 int                     len;
 510                 unsigned char           *buf;
 511
 512                 /* urb->iso_frame_desc is currently ignored here... */
 513
 514                 ep->nak_count = ep->error_count = 0;
 515                 switch (ep->nextpid) {
 516                 case USB_PID_OUT:
 517                         // PACKET("...ACK/out_%02x qh%p\n", bank, ep);
 518                         urb->actual_length += ep->length;
 519                         usb_dotoggle(udev, ep->epnum, 1);
 520                         if (urb->actual_length
 521                                         == urb->transfer_buffer_length) {
 522                                 if (usb_pipecontrol(urb->pipe))
 523                                         ep->nextpid = USB_PID_ACK;
 524
 525                                 /* some bulk protocols terminate OUT transfers
 526                                  * by a short packet, using ZLPs not padding.
 527                                  */
 528                                 else if (ep->length < ep->maxpacket
 529                                                 || !(urb->transfer_flags
 530                                                         & URB_ZERO_PACKET))
 531                                         urbstat = 0;
 532                         }
 533                         break;
 534                 case USB_PID_IN:
 535                         // PACKET("...ACK/in_%02x qh%p\n", bank, ep);
 536                         buf = urb->transfer_buffer + urb->actual_length;
 537                         prefetchw(buf);
 538                         len = ep->maxpacket - sl811_read(sl811,
 539                                                 bank + SL11H_XFERCNTREG);
 540                         if (len > ep->length) {
 541                                 len = ep->length;
 542                                 urb->status = -EOVERFLOW;
 543                         }
 544                         urb->actual_length += len;
 545                         sl811_read_buf(sl811, SL811HS_PACKET_BUF(bank == 0),
 546                                         buf, len);
 547                         usb_dotoggle(udev, ep->epnum, 0);
 548                         if (urb->actual_length == urb->transfer_buffer_length)
 549                                 urbstat = 0;
 550                         else if (len < ep->maxpacket) {
 551                                 if (urb->transfer_flags & URB_SHORT_NOT_OK)
 552                                         urbstat = -EREMOTEIO;
 553                                 else
 554                                         urbstat = 0;
 555                         }
 556                         if (usb_pipecontrol(urb->pipe)
 557                                         && (urbstat == -EREMOTEIO
 558                                                 || urbstat == 0)) {
 559
 560                                 /* NOTE if the status stage STALLs (why?),
 561                                  * this reports the wrong urb status.
 562                                  */
 563                                 spin_lock(&urb->lock);
 564                                 if (urb->status == -EINPROGRESS)
 565                                         urb->status = urbstat;
 566                                 spin_unlock(&urb->lock);
 567
 568                                 urb = NULL;
 569                                 ep->nextpid = USB_PID_ACK;
 570                         }
 571                         break;
 572                 case USB_PID_SETUP:
 573                         // PACKET("...ACK/setup_%02x qh%p\n", bank, ep);
 574                         if (urb->transfer_buffer_length == urb->actual_length)
 575                                 ep->nextpid = USB_PID_ACK;
 576                         else if (usb_pipeout(urb->pipe)) {
 577                                 usb_settoggle(udev, 0, 1, 1);
 578                                 ep->nextpid = USB_PID_OUT;
 579                         } else {
 580                                 usb_settoggle(udev, 0, 0, 1);
 581                                 ep->nextpid = USB_PID_IN;
 582                         }
 583                         break;
 584                 case USB_PID_ACK:
 585                         // PACKET("...ACK/status_%02x qh%p\n", bank, ep);
 586                         urbstat = 0;
 587                         break;
 588                 }
 589
 590         /* STALL stops all transfers */
 591         } else if (status & SL11H_STATMASK_STALL) {
 592                 PACKET("...STALL_%02x qh%p\n", bank, ep);
 593                 ep->nak_count = ep->error_count = 0;
 594                 urbstat = -EPIPE;
 595
 596         /* error? retry, until "3 strikes" */
 597         } else if (++ep->error_count >= 3) {
 598                 if (status & SL11H_STATMASK_TMOUT)
 599                         urbstat = -ETIME;
 600                 else if (status & SL11H_STATMASK_OVF)
 601                         urbstat = -EOVERFLOW;
 602                 else
 603                         urbstat = -EPROTO;
 604                 ep->error_count = 0;
 605                 PACKET("...3STRIKES_%02x %02x qh%p stat %d\n",
 606                                 bank, status, ep, urbstat);
 607         }
 608
 609         if (urb && (urbstat != -EINPROGRESS || urb->status != -EINPROGRESS))
 610                 finish_request(sl811, ep, urb, urbstat);
 611 }
 612
 613 static inline u8 checkdone(struct sl811 *sl811)
 614 {
 615         u8      ctl;
 616         u8      irqstat = 0;
 617
 618         if (sl811->active_a && time_before_eq(sl811->jiffies_a, jiffies)) {
 619                 ctl = sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG));
 620                 if (ctl & SL11H_HCTLMASK_ARM)
 621                         sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
 622                 DBG("%s DONE_A: ctrl %02x sts %02x\n",
 623                         (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
 624                         ctl,
 625                         sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
 626                 irqstat |= SL11H_INTMASK_DONE_A;
 627         }
 628 #ifdef  USE_B
 629         if (sl811->active_b && time_before_eq(sl811->jiffies_b, jiffies)) {
 630                 ctl = sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG));
 631                 if (ctl & SL11H_HCTLMASK_ARM)
 632                         sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
 633                 DBG("%s DONE_B: ctrl %02x sts %02x\n",
 634                         (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
 635                         ctl,
 636                         sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
 637                 irqstat |= SL11H_INTMASK_DONE_A;
 638         }
 639 #endif
 640         return irqstat;
 641 }
 642
 643 static irqreturn_t sl811h_irq(struct usb_hcd *hcd)
 644 {
 645         struct sl811    *sl811 = hcd_to_sl811(hcd);
 646         u8              irqstat;
 647         irqreturn_t     ret = IRQ_NONE;
 648         unsigned        retries = 5;
 649
 650         spin_lock(&sl811->lock);
 651
 652 retry:
 653         irqstat = sl811_read(sl811, SL11H_IRQ_STATUS) & ~SL11H_INTMASK_DP;
 654         if (irqstat) {
 655                 sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
 656                 irqstat &= sl811->irq_enable;
 657         }
 658
 659 #ifdef  QUIRK2
 660         /* this may no longer be necessary ... */
 661         if (irqstat == 0) {
 662                 irqstat = checkdone(sl811);
 663                 if (irqstat)
 664                         sl811->stat_lost++;
 665         }
 666 #endif
 667
 668         /* USB packets, not necessarily handled in the order they're
 669          * issued ... that's fine if they're different endpoints.
 670          */
 671         if (irqstat & SL11H_INTMASK_DONE_A) {
 672                 done(sl811, sl811->active_a, SL811_EP_A(SL811_HOST_BUF));
 673                 sl811->active_a = NULL;
 674                 sl811->stat_a++;
 675         }
 676 #ifdef USE_B
 677         if (irqstat & SL11H_INTMASK_DONE_B) {
 678                 done(sl811, sl811->active_b, SL811_EP_B(SL811_HOST_BUF));
 679                 sl811->active_b = NULL;
 680                 sl811->stat_b++;
 681         }
 682 #endif
 683         if (irqstat & SL11H_INTMASK_SOFINTR) {
 684                 unsigned index;
 685
 686                 index = sl811->frame++ % (PERIODIC_SIZE - 1);
 687                 sl811->stat_sof++;
 688
 689                 /* be graceful about almost-inevitable periodic schedule
 690                  * overruns:  continue the previous frame's transfers iff
 691                  * this one has nothing scheduled.
 692                  */
 693                 if (sl811->next_periodic) {
 694                         // ERR("overrun to slot %d\n", index);
 695                         sl811->stat_overrun++;
 696                 }
 697                 if (sl811->periodic[index])
 698                         sl811->next_periodic = sl811->periodic[index];
 699         }
 700
 701         /* khubd manages debouncing and wakeup */
 702         if (irqstat & SL11H_INTMASK_INSRMV) {
 703                 sl811->stat_insrmv++;
 704
 705                 /* most stats are reset for each VBUS session */
 706                 sl811->stat_wake = 0;
 707                 sl811->stat_sof = 0;
 708                 sl811->stat_a = 0;
 709                 sl811->stat_b = 0;
 710                 sl811->stat_lost = 0;
 711
 712                 sl811->ctrl1 = 0;
 713                 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
 714
 715                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
 716                 sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 717
 718                 /* usbcore nukes other pending transactions on disconnect */
 719                 if (sl811->active_a) {
 720                         sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
 721                         finish_request(sl811, sl811->active_a,
 722                                 container_of(sl811->active_a
 723                                                 ->hep->urb_list.next,
 724                                         struct urb, urb_list),
 725                                 -ESHUTDOWN);
 726                         sl811->active_a = NULL;
 727                 }
 728 #ifdef  USE_B
 729                 if (sl811->active_b) {
 730                         sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
 731                         finish_request(sl811, sl811->active_b,
 732                                 container_of(sl811->active_b
 733                                                 ->hep->urb_list.next,
 734                                         struct urb, urb_list),
 735                                 NULL, -ESHUTDOWN);
 736                         sl811->active_b = NULL;
 737                 }
 738 #endif
 739
 740                 /* port status seems weird until after reset, so
 741                  * force the reset and make khubd clean up later.
 742                  */
 743                 sl811->port1 |= (1 << USB_PORT_FEAT_C_CONNECTION)
 744                                 | (1 << USB_PORT_FEAT_CONNECTION);
 745
 746         } else if (irqstat & SL11H_INTMASK_RD) {
 747                 if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND)) {
 748                         DBG("wakeup\n");
 749                         sl811->port1 |= 1 << USB_PORT_FEAT_C_SUSPEND;
 750                         sl811->stat_wake++;
 751                 } else
 752                         irqstat &= ~SL11H_INTMASK_RD;
 753         }
 754
 755         if (irqstat) {
 756                 if (sl811->port1 & (1 << USB_PORT_FEAT_ENABLE))
 757                         start_transfer(sl811);
 758                 ret = IRQ_HANDLED;
 759                 if (retries--)
 760                         goto retry;
 761         }
 762
 763         if (sl811->periodic_count == 0 && list_empty(&sl811->async))
 764                 sofirq_off(sl811);
 765         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 766
 767         spin_unlock(&sl811->lock);
 768
 769         return ret;
 770 }
 771
 772 /*-------------------------------------------------------------------------*/
 773
 774 /* usb 1.1 says max 90% of a frame is available for periodic transfers.
 775  * this driver doesn't promise that much since it's got to handle an
 776  * IRQ per packet; irq handling latencies also use up that time.
 777  *
 778  * NOTE:  the periodic schedule is a sparse tree, with the load for
 779  * each branch minimized.  see fig 3.5 in the OHCI spec for example.
 780  */
 781 #define MAX_PERIODIC_LOAD       500     /* out of 1000 usec */
 782
 783 static int balance(struct sl811 *sl811, u16 period, u16 load)
 784 {
 785         int     i, branch = -ENOSPC;
 786
 787         /* search for the least loaded schedule branch of that period
 788          * which has enough bandwidth left unreserved.
 789          */
 790         for (i = 0; i < period ; i++) {
 791                 if (branch < 0 || sl811->load[branch] > sl811->load[i]) {
 792                         int     j;
 793
 794                         for (j = i; j < PERIODIC_SIZE; j += period) {
 795                                 if ((sl811->load[j] + load)
 796                                                 > MAX_PERIODIC_LOAD)
 797                                         break;
 798                         }
 799                         if (j < PERIODIC_SIZE)
 800                                 continue;
 801                         branch = i;
 802                 }
 803         }
 804         return branch;
 805 }
 806
 807 /*-------------------------------------------------------------------------*/
 808
 809 static int sl811h_urb_enqueue(
 810         struct usb_hcd          *hcd,
 811         struct usb_host_endpoint *hep,
 812         struct urb              *urb,
 813         gfp_t                   mem_flags
 814 ) {
 815         struct sl811            *sl811 = hcd_to_sl811(hcd);
 816         struct usb_device       *udev = urb->dev;
 817         unsigned int            pipe = urb->pipe;
 818         int                     is_out = !usb_pipein(pipe);
 819         int                     type = usb_pipetype(pipe);
 820         int                     epnum = usb_pipeendpoint(pipe);
 821         struct sl811h_ep        *ep = NULL;
 822         unsigned long           flags;
 823         int                     i;
 824         int                     retval = 0;
 825
 826 #ifdef  DISABLE_ISO
 827         if (type == PIPE_ISOCHRONOUS)
 828                 return -ENOSPC;
 829 #endif
 830
 831         /* avoid all allocations within spinlocks */
 832         if (!hep->hcpriv)
 833                 ep = kzalloc(sizeof *ep, mem_flags);
 834
 835         spin_lock_irqsave(&sl811->lock, flags);
 836
 837         /* don't submit to a dead or disabled port */
 838         if (!(sl811->port1 & (1 << USB_PORT_FEAT_ENABLE))
 839                         || !HC_IS_RUNNING(hcd->state)) {
 840                 retval = -ENODEV;
 841                 kfree(ep);
 842                 goto fail;
 843         }
 844
 845         if (hep->hcpriv) {
 846                 kfree(ep);
 847                 ep = hep->hcpriv;
 848         } else if (!ep) {
 849                 retval = -ENOMEM;
 850                 goto fail;
 851
 852         } else {
 853                 INIT_LIST_HEAD(&ep->schedule);
 854                 ep->udev = udev;
 855                 ep->epnum = epnum;
 856                 ep->maxpacket = usb_maxpacket(udev, urb->pipe, is_out);
 857                 ep->defctrl = SL11H_HCTLMASK_ARM | SL11H_HCTLMASK_ENABLE;
 858                 usb_settoggle(udev, epnum, is_out, 0);
 859
 860                 if (type == PIPE_CONTROL)
 861                         ep->nextpid = USB_PID_SETUP;
 862                 else if (is_out)
 863                         ep->nextpid = USB_PID_OUT;
 864                 else
 865                         ep->nextpid = USB_PID_IN;
 866
 867                 if (ep->maxpacket > H_MAXPACKET) {
 868                         /* iso packets up to 240 bytes could work... */
 869                         DBG("dev %d ep%d maxpacket %d\n",
 870                                 udev->devnum, epnum, ep->maxpacket);
 871                         retval = -EINVAL;
 872                         goto fail;
 873                 }
 874
 875                 if (udev->speed == USB_SPEED_LOW) {
 876                         /* send preamble for external hub? */
 877                         if (!(sl811->ctrl1 & SL11H_CTL1MASK_LSPD))
 878                                 ep->defctrl |= SL11H_HCTLMASK_PREAMBLE;
 879                 }
 880                 switch (type) {
 881                 case PIPE_ISOCHRONOUS:
 882                 case PIPE_INTERRUPT:
 883                         if (urb->interval > PERIODIC_SIZE)
 884                                 urb->interval = PERIODIC_SIZE;
 885                         ep->period = urb->interval;
 886                         ep->branch = PERIODIC_SIZE;
 887                         if (type == PIPE_ISOCHRONOUS)
 888                                 ep->defctrl |= SL11H_HCTLMASK_ISOCH;
 889                         ep->load = usb_calc_bus_time(udev->speed, !is_out,
 890                                 (type == PIPE_ISOCHRONOUS),
 891                                 usb_maxpacket(udev, pipe, is_out))
 892                                         / 1000;
 893                         break;
 894                 }
 895
 896                 ep->hep = hep;
 897                 hep->hcpriv = ep;
 898         }
 899
 900         /* maybe put endpoint into schedule */
 901         switch (type) {
 902         case PIPE_CONTROL:
 903         case PIPE_BULK:
 904                 if (list_empty(&ep->schedule))
 905                         list_add_tail(&ep->schedule, &sl811->async);
 906                 break;
 907         case PIPE_ISOCHRONOUS:
 908         case PIPE_INTERRUPT:
 909                 urb->interval = ep->period;
 910                 if (ep->branch < PERIODIC_SIZE) {
 911                         /* NOTE:  the phase is correct here, but the value
 912                          * needs offsetting by the transfer queue depth.
 913                          * All current drivers ignore start_frame, so this
 914                          * is unlikely to ever matter...
 915                          */
 916                         urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
 917                                                 + ep->branch;
 918                         break;
 919                 }
 920
 921                 retval = balance(sl811, ep->period, ep->load);
 922                 if (retval < 0)
 923                         goto fail;
 924                 ep->branch = retval;
 925                 retval = 0;
 926                 urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
 927                                         + ep->branch;
 928
 929                 /* sort each schedule branch by period (slow before fast)
 930                  * to share the faster parts of the tree without needing
 931                  * dummy/placeholder nodes
 932                  */
 933                 DBG("schedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
 934                 for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
 935                         struct sl811h_ep        **prev = &sl811->periodic[i];
 936                         struct sl811h_ep        *here = *prev;
 937
 938                         while (here && ep != here) {
 939                                 if (ep->period > here->period)
 940                                         break;
 941                                 prev = &here->next;
 942                                 here = *prev;
 943                         }
 944                         if (ep != here) {
 945                                 ep->next = here;
 946                                 *prev = ep;
 947                         }
 948                         sl811->load[i] += ep->load;
 949                 }
 950                 sl811->periodic_count++;
 951                 hcd->self.bandwidth_allocated += ep->load / ep->period;
 952                 sofirq_on(sl811);
 953         }
 954
 955         /* in case of unlink-during-submit */
 956         spin_lock(&urb->lock);
 957         if (urb->status != -EINPROGRESS) {
 958                 spin_unlock(&urb->lock);
 959                 finish_request(sl811, ep, urb, 0);
 960                 retval = 0;
 961                 goto fail;
 962         }
 963         urb->hcpriv = hep;
 964         spin_unlock(&urb->lock);
 965
 966         start_transfer(sl811);
 967         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 968 fail:
 969         spin_unlock_irqrestore(&sl811->lock, flags);
 970         return retval;
 971 }
 972
 973 static int sl811h_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
 974 {
 975         struct sl811            *sl811 = hcd_to_sl811(hcd);
 976         struct usb_host_endpoint *hep;
 977         unsigned long           flags;
 978         struct sl811h_ep        *ep;
 979         int                     retval = 0;
 980
 981         spin_lock_irqsave(&sl811->lock, flags);
 982         hep = urb->hcpriv;
 983         if (!hep)
 984                 goto fail;
 985
 986         ep = hep->hcpriv;
 987         if (ep) {
 988                 /* finish right away if this urb can't be active ...
 989                  * note that some drivers wrongly expect delays
 990                  */
 991                 if (ep->hep->urb_list.next != &urb->urb_list) {
 992                         /* not front of queue?  never active */
 993
 994                 /* for active transfers, we expect an IRQ */
 995                 } else if (sl811->active_a == ep) {
 996                         if (time_before_eq(sl811->jiffies_a, jiffies)) {
 997                                 /* happens a lot with lowspeed?? */
 998                                 DBG("giveup on DONE_A: ctrl %02x sts %02x\n",
 999                                         sl811_read(sl811,
1000                                                 SL811_EP_A(SL11H_HOSTCTLREG)),
1001                                         sl811_read(sl811,
1002                                                 SL811_EP_A(SL11H_PKTSTATREG)));
1003                                 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
1004                                                 0);
1005                                 sl811->active_a = NULL;
1006                         } else
1007                                 urb = NULL;
1008 #ifdef  USE_B
1009                 } else if (sl811->active_b == ep) {
1010                         if (time_before_eq(sl811->jiffies_a, jiffies)) {
1011                                 /* happens a lot with lowspeed?? */
1012                                 DBG("giveup on DONE_B: ctrl %02x sts %02x\n",
1013                                         sl811_read(sl811,
1014                                                 SL811_EP_B(SL11H_HOSTCTLREG)),
1015                                         sl811_read(sl811,
1016                                                 SL811_EP_B(SL11H_PKTSTATREG)));
1017                                 sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG),
1018                                                 0);
1019                                 sl811->active_b = NULL;
1020                         } else
1021                                 urb = NULL;
1022 #endif
1023                 } else {
1024                         /* front of queue for inactive endpoint */
1025                 }
1026
1027                 if (urb)
1028                         finish_request(sl811, ep, urb, 0);
1029                 else
1030                         VDBG("dequeue, urb %p active %s; wait4irq\n", urb,
1031                                 (sl811->active_a == ep) ? "A" : "B");
1032         } else
1033 fail:
1034                 retval = -EINVAL;
1035         spin_unlock_irqrestore(&sl811->lock, flags);
1036         return retval;
1037 }
1038
1039 static void
1040 sl811h_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
1041 {
1042         struct sl811h_ep        *ep = hep->hcpriv;
1043
1044         if (!ep)
1045                 return;
1046
1047         /* assume we'd just wait for the irq */
1048         if (!list_empty(&hep->urb_list))
1049                 msleep(3);
1050         if (!list_empty(&hep->urb_list))
1051                 WARN("ep %p not empty?\n", ep);
1052
1053         kfree(ep);
1054         hep->hcpriv = NULL;
1055 }
1056
1057 static int
1058 sl811h_get_frame(struct usb_hcd *hcd)
1059 {
1060         struct sl811 *sl811 = hcd_to_sl811(hcd);
1061
1062         /* wrong except while periodic transfers are scheduled;
1063          * never matches the on-the-wire frame;
1064          * subject to overruns.
1065          */
1066         return sl811->frame;
1067 }
1068
1069
1070 /*-------------------------------------------------------------------------*/
1071
1072 /* the virtual root hub timer IRQ checks for hub status */
1073 static int
1074 sl811h_hub_status_data(struct usb_hcd *hcd, char *buf)
1075 {
1076         struct sl811 *sl811 = hcd_to_sl811(hcd);
1077 #ifdef  QUIRK3
1078         unsigned long flags;
1079
1080         /* non-SMP HACK: use root hub timer as i/o watchdog
1081          * this seems essential when SOF IRQs aren't in use...
1082          */
1083         local_irq_save(flags);
1084         if (!timer_pending(&sl811->timer)) {
1085                 if (sl811h_irq( /* ~0, */ hcd) != IRQ_NONE)
1086                         sl811->stat_lost++;
1087         }
1088         local_irq_restore(flags);
1089 #endif
1090
1091         if (!(sl811->port1 & (0xffff << 16)))
1092                 return 0;
1093
1094         /* tell khubd port 1 changed */
1095         *buf = (1 << 1);
1096         return 1;
1097 }
1098
1099 static void
1100 sl811h_hub_descriptor (
1101         struct sl811                    *sl811,
1102         struct usb_hub_descriptor       *desc
1103 ) {
1104         u16             temp = 0;
1105
1106         desc->bDescriptorType = 0x29;
1107         desc->bHubContrCurrent = 0;
1108
1109         desc->bNbrPorts = 1;
1110         desc->bDescLength = 9;
1111
1112         /* per-port power switching (gang of one!), or none */
1113         desc->bPwrOn2PwrGood = 0;
1114         if (sl811->board && sl811->board->port_power) {
1115                 desc->bPwrOn2PwrGood = sl811->board->potpg;
1116                 if (!desc->bPwrOn2PwrGood)
1117                         desc->bPwrOn2PwrGood = 10;
1118                 temp = 0x0001;
1119         } else
1120                 temp = 0x0002;
1121
1122         /* no overcurrent errors detection/handling */
1123         temp |= 0x0010;
1124
1125         desc->wHubCharacteristics = (__force __u16)cpu_to_le16(temp);
1126
1127         /* two bitmaps:  ports removable, and legacy PortPwrCtrlMask */
1128         desc->bitmap[0] = 0 << 1;
1129         desc->bitmap[1] = ~0;
1130 }
1131
1132 static void
1133 sl811h_timer(unsigned long _sl811)
1134 {
1135         struct sl811    *sl811 = (void *) _sl811;
1136         unsigned long   flags;
1137         u8              irqstat;
1138         u8              signaling = sl811->ctrl1 & SL11H_CTL1MASK_FORCE;
1139         const u32       mask = (1 << USB_PORT_FEAT_CONNECTION)
1140                                 | (1 << USB_PORT_FEAT_ENABLE)
1141                                 | (1 << USB_PORT_FEAT_LOWSPEED);
1142
1143         spin_lock_irqsave(&sl811->lock, flags);
1144
1145         /* stop special signaling */
1146         sl811->ctrl1 &= ~SL11H_CTL1MASK_FORCE;
1147         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1148         udelay(3);
1149
1150         irqstat = sl811_read(sl811, SL11H_IRQ_STATUS);
1151
1152         switch (signaling) {
1153         case SL11H_CTL1MASK_SE0:
1154                 DBG("end reset\n");
1155                 sl811->port1 = (1 << USB_PORT_FEAT_C_RESET)
1156                                 | (1 << USB_PORT_FEAT_POWER);
1157                 sl811->ctrl1 = 0;
1158                 /* don't wrongly ack RD */
1159                 if (irqstat & SL11H_INTMASK_INSRMV)
1160                         irqstat &= ~SL11H_INTMASK_RD;
1161                 break;
1162         case SL11H_CTL1MASK_K:
1163                 DBG("end resume\n");
1164                 sl811->port1 &= ~(1 << USB_PORT_FEAT_SUSPEND);
1165                 break;
1166         default:
1167                 DBG("odd timer signaling: %02x\n", signaling);
1168                 break;
1169         }
1170         sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
1171
1172         if (irqstat & SL11H_INTMASK_RD) {
1173                 /* usbcore nukes all pending transactions on disconnect */
1174                 if (sl811->port1 & (1 << USB_PORT_FEAT_CONNECTION))
1175                         sl811->port1 |= (1 << USB_PORT_FEAT_C_CONNECTION)
1176                                         | (1 << USB_PORT_FEAT_C_ENABLE);
1177                 sl811->port1 &= ~mask;
1178                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
1179         } else {
1180                 sl811->port1 |= mask;
1181                 if (irqstat & SL11H_INTMASK_DP)
1182                         sl811->port1 &= ~(1 << USB_PORT_FEAT_LOWSPEED);
1183                 sl811->irq_enable = SL11H_INTMASK_INSRMV | SL11H_INTMASK_RD;
1184         }
1185
1186         if (sl811->port1 & (1 << USB_PORT_FEAT_CONNECTION)) {
1187                 u8      ctrl2 = SL811HS_CTL2_INIT;
1188
1189                 sl811->irq_enable |= SL11H_INTMASK_DONE_A;
1190 #ifdef USE_B
1191                 sl811->irq_enable |= SL11H_INTMASK_DONE_B;
1192 #endif
1193                 if (sl811->port1 & (1 << USB_PORT_FEAT_LOWSPEED)) {
1194                         sl811->ctrl1 |= SL11H_CTL1MASK_LSPD;
1195                         ctrl2 |= SL811HS_CTL2MASK_DSWAP;
1196                 }
1197
1198                 /* start SOFs flowing, kickstarting with A registers */
1199                 sl811->ctrl1 |= SL11H_CTL1MASK_SOF_ENA;
1200                 sl811_write(sl811, SL11H_SOFLOWREG, 0xe0);
1201                 sl811_write(sl811, SL811HS_CTLREG2, ctrl2);
1202
1203                 /* autoincrementing */
1204                 sl811_write(sl811, SL811_EP_A(SL11H_BUFLNTHREG), 0);
1205                 writeb(SL_SOF, sl811->data_reg);
1206                 writeb(0, sl811->data_reg);
1207                 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
1208                                 SL11H_HCTLMASK_ARM);
1209
1210                 /* khubd provides debounce delay */
1211         } else {
1212                 sl811->ctrl1 = 0;
1213         }
1214         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1215
1216         /* reenable irqs */
1217         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
1218         spin_unlock_irqrestore(&sl811->lock, flags);
1219 }
1220
1221 static int
1222 sl811h_hub_control(
1223         struct usb_hcd  *hcd,
1224         u16             typeReq,
1225         u16             wValue,
1226         u16             wIndex,
1227         char            *buf,
1228         u16             wLength
1229 ) {
1230         struct sl811    *sl811 = hcd_to_sl811(hcd);
1231         int             retval = 0;
1232         unsigned long   flags;
1233
1234         spin_lock_irqsave(&sl811->lock, flags);
1235
1236         switch (typeReq) {
1237         case ClearHubFeature:
1238         case SetHubFeature:
1239                 switch (wValue) {
1240                 case C_HUB_OVER_CURRENT:
1241                 case C_HUB_LOCAL_POWER:
1242                         break;
1243                 default:
1244                         goto error;
1245                 }
1246                 break;
1247         case ClearPortFeature:
1248                 if (wIndex != 1 || wLength != 0)
1249                         goto error;
1250
1251                 switch (wValue) {
1252                 case USB_PORT_FEAT_ENABLE:
1253                         sl811->port1 &= (1 << USB_PORT_FEAT_POWER);
1254                         sl811->ctrl1 = 0;
1255                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1256                         sl811->irq_enable = SL11H_INTMASK_INSRMV;
1257                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1258                                                 sl811->irq_enable);
1259                         break;
1260                 case USB_PORT_FEAT_SUSPEND:
1261                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND)))
1262                                 break;
1263
1264                         /* 20 msec of resume/K signaling, other irqs blocked */
1265                         DBG("start resume...\n");
1266                         sl811->irq_enable = 0;
1267                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1268                                                 sl811->irq_enable);
1269                         sl811->ctrl1 |= SL11H_CTL1MASK_K;
1270                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1271
1272                         mod_timer(&sl811->timer, jiffies
1273                                         + msecs_to_jiffies(20));
1274                         break;
1275                 case USB_PORT_FEAT_POWER:
1276                         port_power(sl811, 0);
1277                         break;
1278                 case USB_PORT_FEAT_C_ENABLE:
1279                 case USB_PORT_FEAT_C_SUSPEND:
1280                 case USB_PORT_FEAT_C_CONNECTION:
1281                 case USB_PORT_FEAT_C_OVER_CURRENT:
1282                 case USB_PORT_FEAT_C_RESET:
1283                         break;
1284                 default:
1285                         goto error;
1286                 }
1287                 sl811->port1 &= ~(1 << wValue);
1288                 break;
1289         case GetHubDescriptor:
1290                 sl811h_hub_descriptor(sl811, (struct usb_hub_descriptor *) buf);
1291                 break;
1292         case GetHubStatus:
1293                 *(__le32 *) buf = cpu_to_le32(0);
1294                 break;
1295         case GetPortStatus:
1296                 if (wIndex != 1)
1297                         goto error;
1298                 *(__le32 *) buf = cpu_to_le32(sl811->port1);
1299
1300 #ifndef VERBOSE
1301         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
1302 #endif
1303                 DBG("GetPortStatus %08x\n", sl811->port1);
1304                 break;
1305         case SetPortFeature:
1306                 if (wIndex != 1 || wLength != 0)
1307                         goto error;
1308                 switch (wValue) {
1309                 case USB_PORT_FEAT_SUSPEND:
1310                         if (sl811->port1 & (1 << USB_PORT_FEAT_RESET))
1311                                 goto error;
1312                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_ENABLE)))
1313                                 goto error;
1314
1315                         DBG("suspend...\n");
1316                         sl811->ctrl1 &= ~SL11H_CTL1MASK_SOF_ENA;
1317                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1318                         break;
1319                 case USB_PORT_FEAT_POWER:
1320                         port_power(sl811, 1);
1321                         break;
1322                 case USB_PORT_FEAT_RESET:
1323                         if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND))
1324                                 goto error;
1325                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_POWER)))
1326                                 break;
1327
1328                         /* 50 msec of reset/SE0 signaling, irqs blocked */
1329                         sl811->irq_enable = 0;
1330                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1331                                                 sl811->irq_enable);
1332                         sl811->ctrl1 = SL11H_CTL1MASK_SE0;
1333                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1334                         sl811->port1 |= (1 << USB_PORT_FEAT_RESET);
1335                         mod_timer(&sl811->timer, jiffies
1336                                         + msecs_to_jiffies(50));
1337                         break;
1338                 default:
1339                         goto error;
1340                 }
1341                 sl811->port1 |= 1 << wValue;
1342                 break;
1343
1344         default:
1345 error:
1346                 /* "protocol stall" on error */
1347                 retval = -EPIPE;
1348         }
1349
1350         spin_unlock_irqrestore(&sl811->lock, flags);
1351         return retval;
1352 }
1353
1354 #ifdef  CONFIG_PM
1355
1356 static int
1357 sl811h_bus_suspend(struct usb_hcd *hcd)
1358 {
1359         // SOFs off
1360         DBG("%s\n", __FUNCTION__);
1361         return 0;
1362 }
1363
1364 static int
1365 sl811h_bus_resume(struct usb_hcd *hcd)
1366 {
1367         // SOFs on
1368         DBG("%s\n", __FUNCTION__);
1369         return 0;
1370 }
1371
1372 #else
1373
1374 #define sl811h_bus_suspend      NULL
1375 #define sl811h_bus_resume       NULL
1376
1377 #endif
1378
1379
1380 /*-------------------------------------------------------------------------*/
1381
1382 #ifdef STUB_DEBUG_FILE
1383
1384 static inline void create_debug_file(struct sl811 *sl811) { }
1385 static inline void remove_debug_file(struct sl811 *sl811) { }
1386
1387 #else
1388
1389 #include <linux/proc_fs.h>
1390 #include <linux/seq_file.h>
1391
1392 static void dump_irq(struct seq_file *s, char *label, u8 mask)
1393 {
1394         seq_printf(s, "%s %02x%s%s%s%s%s%s\n", label, mask,
1395                 (mask & SL11H_INTMASK_DONE_A) ? " done_a" : "",
1396                 (mask & SL11H_INTMASK_DONE_B) ? " done_b" : "",
1397                 (mask & SL11H_INTMASK_SOFINTR) ? " sof" : "",
1398                 (mask & SL11H_INTMASK_INSRMV) ? " ins/rmv" : "",
1399                 (mask & SL11H_INTMASK_RD) ? " rd" : "",
1400                 (mask & SL11H_INTMASK_DP) ? " dp" : "");
1401 }
1402
1403 static int proc_sl811h_show(struct seq_file *s, void *unused)
1404 {
1405         struct sl811            *sl811 = s->private;
1406         struct sl811h_ep        *ep;
1407         unsigned                i;
1408
1409         seq_printf(s, "%s\n%s version %s\nportstatus[1] = %08x\n",
1410                 sl811_to_hcd(sl811)->product_desc,
1411                 hcd_name, DRIVER_VERSION,
1412                 sl811->port1);
1413
1414         seq_printf(s, "insert/remove: %ld\n", sl811->stat_insrmv);
1415         seq_printf(s, "current session:  done_a %ld done_b %ld "
1416                         "wake %ld sof %ld overrun %ld lost %ld\n\n",
1417                 sl811->stat_a, sl811->stat_b,
1418                 sl811->stat_wake, sl811->stat_sof,
1419                 sl811->stat_overrun, sl811->stat_lost);
1420
1421         spin_lock_irq(&sl811->lock);
1422
1423         if (sl811->ctrl1 & SL11H_CTL1MASK_SUSPEND)
1424                 seq_printf(s, "(suspended)\n\n");
1425         else {
1426                 u8      t = sl811_read(sl811, SL11H_CTLREG1);
1427
1428                 seq_printf(s, "ctrl1 %02x%s%s%s%s\n", t,
1429                         (t & SL11H_CTL1MASK_SOF_ENA) ? " sofgen" : "",
1430                         ({char *s; switch (t & SL11H_CTL1MASK_FORCE) {
1431                         case SL11H_CTL1MASK_NORMAL: s = ""; break;
1432                         case SL11H_CTL1MASK_SE0: s = " se0/reset"; break;
1433                         case SL11H_CTL1MASK_K: s = " k/resume"; break;
1434                         default: s = "j"; break;
1435                         }; s; }),
1436                         (t & SL11H_CTL1MASK_LSPD) ? " lowspeed" : "",
1437                         (t & SL11H_CTL1MASK_SUSPEND) ? " suspend" : "");
1438
1439                 dump_irq(s, "irq_enable",
1440                                 sl811_read(sl811, SL11H_IRQ_ENABLE));
1441                 dump_irq(s, "irq_status",
1442                                 sl811_read(sl811, SL11H_IRQ_STATUS));
1443                 seq_printf(s, "frame clocks remaining:  %d\n",
1444                                 sl811_read(sl811, SL11H_SOFTMRREG) << 6);
1445         }
1446
1447         seq_printf(s, "A: qh%p ctl %02x sts %02x\n", sl811->active_a,
1448                 sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG)),
1449                 sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
1450         seq_printf(s, "B: qh%p ctl %02x sts %02x\n", sl811->active_b,
1451                 sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG)),
1452                 sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
1453         seq_printf(s, "\n");
1454         list_for_each_entry (ep, &sl811->async, schedule) {
1455                 struct urb              *urb;
1456
1457                 seq_printf(s, "%s%sqh%p, ep%d%s, maxpacket %d"
1458                                         " nak %d err %d\n",
1459                         (ep == sl811->active_a) ? "(A) " : "",
1460                         (ep == sl811->active_b) ? "(B) " : "",
1461                         ep, ep->epnum,
1462                         ({ char *s; switch (ep->nextpid) {
1463                         case USB_PID_IN: s = "in"; break;
1464                         case USB_PID_OUT: s = "out"; break;
1465                         case USB_PID_SETUP: s = "setup"; break;
1466                         case USB_PID_ACK: s = "status"; break;
1467                         default: s = "?"; break;
1468                         }; s;}),
1469                         ep->maxpacket,
1470                         ep->nak_count, ep->error_count);
1471                 list_for_each_entry (urb, &ep->hep->urb_list, urb_list) {
1472                         seq_printf(s, "  urb%p, %d/%d\n", urb,
1473                                 urb->actual_length,
1474                                 urb->transfer_buffer_length);
1475                 }
1476         }
1477         if (!list_empty(&sl811->async))
1478                 seq_printf(s, "\n");
1479
1480         seq_printf(s, "periodic size= %d\n", PERIODIC_SIZE);
1481
1482         for (i = 0; i < PERIODIC_SIZE; i++) {
1483                 ep = sl811->periodic[i];
1484                 if (!ep)
1485                         continue;
1486                 seq_printf(s, "%2d [%3d]:\n", i, sl811->load[i]);
1487
1488                 /* DUMB: prints shared entries multiple times */
1489                 do {
1490                         seq_printf(s,
1491                                 "   %s%sqh%d/%p (%sdev%d ep%d%s max %d) "
1492                                         "err %d\n",
1493                                 (ep == sl811->active_a) ? "(A) " : "",
1494                                 (ep == sl811->active_b) ? "(B) " : "",
1495                                 ep->period, ep,
1496                                 (ep->udev->speed == USB_SPEED_FULL)
1497                                         ? "" : "ls ",
1498                                 ep->udev->devnum, ep->epnum,
1499                                 (ep->epnum == 0) ? ""
1500                                         : ((ep->nextpid == USB_PID_IN)
1501                                                 ? "in"
1502                                                 : "out"),
1503                                 ep->maxpacket, ep->error_count);
1504                         ep = ep->next;
1505                 } while (ep);
1506         }
1507
1508         spin_unlock_irq(&sl811->lock);
1509         seq_printf(s, "\n");
1510
1511         return 0;
1512 }
1513
1514 static int proc_sl811h_open(struct inode *inode, struct file *file)
1515 {
1516         return single_open(file, proc_sl811h_show, PDE(inode)->data);
1517 }
1518
1519 static const struct file_operations proc_ops = {
1520         .open           = proc_sl811h_open,
1521         .read           = seq_read,
1522         .llseek         = seq_lseek,
1523         .release        = single_release,
1524 };
1525
1526 /* expect just one sl811 per system */
1527 static const char proc_filename[] = "driver/sl811h";
1528
1529 static void create_debug_file(struct sl811 *sl811)
1530 {
1531         struct proc_dir_entry *pde;
1532
1533         pde = create_proc_entry(proc_filename, 0, NULL);
1534         if (pde == NULL)
1535                 return;
1536
1537         pde->proc_fops = &proc_ops;
1538         pde->data = sl811;
1539         sl811->pde = pde;
1540 }
1541
1542 static void remove_debug_file(struct sl811 *sl811)
1543 {
1544         if (sl811->pde)
1545                 remove_proc_entry(proc_filename, NULL);
1546 }
1547
1548 #endif
1549
1550 /*-------------------------------------------------------------------------*/
1551
1552 static void
1553 sl811h_stop(struct usb_hcd *hcd)
1554 {
1555         struct sl811    *sl811 = hcd_to_sl811(hcd);
1556         unsigned long   flags;
1557
1558         del_timer_sync(&hcd->rh_timer);
1559
1560         spin_lock_irqsave(&sl811->lock, flags);
1561         port_power(sl811, 0);
1562         spin_unlock_irqrestore(&sl811->lock, flags);
1563 }
1564
1565 static int
1566 sl811h_start(struct usb_hcd *hcd)
1567 {
1568         struct sl811            *sl811 = hcd_to_sl811(hcd);
1569
1570         /* chip has been reset, VBUS power is off */
1571         hcd->state = HC_STATE_RUNNING;
1572
1573         if (sl811->board) {
1574                 if (!device_can_wakeup(hcd->self.controller))
1575                         device_init_wakeup(hcd->self.controller,
1576                                 sl811->board->can_wakeup);
1577                 hcd->power_budget = sl811->board->power * 2;
1578         }
1579
1580         /* enable power and interupts */
1581         port_power(sl811, 1);
1582
1583         return 0;
1584 }
1585
1586 /*-------------------------------------------------------------------------*/
1587
1588 static struct hc_driver sl811h_hc_driver = {
1589         .description =          hcd_name,
1590         .hcd_priv_size =        sizeof(struct sl811),
1591
1592         /*
1593          * generic hardware linkage
1594          */
1595         .irq =                  sl811h_irq,
1596         .flags =                HCD_USB11 | HCD_MEMORY,
1597
1598         /* Basic lifecycle operations */
1599         .start =                sl811h_start,
1600         .stop =                 sl811h_stop,
1601
1602         /*
1603          * managing i/o requests and associated device resources
1604          */
1605         .urb_enqueue =          sl811h_urb_enqueue,
1606         .urb_dequeue =          sl811h_urb_dequeue,
1607         .endpoint_disable =     sl811h_endpoint_disable,
1608
1609         /*
1610          * periodic schedule support
1611          */
1612         .get_frame_number =     sl811h_get_frame,
1613
1614         /*
1615          * root hub support
1616          */
1617         .hub_status_data =      sl811h_hub_status_data,
1618         .hub_control =          sl811h_hub_control,
1619         .bus_suspend =          sl811h_bus_suspend,
1620         .bus_resume =           sl811h_bus_resume,
1621 };
1622
1623 /*-------------------------------------------------------------------------*/
1624
1625 static int __devexit
1626 sl811h_remove(struct platform_device *dev)
1627 {
1628         struct usb_hcd          *hcd = platform_get_drvdata(dev);
1629         struct sl811            *sl811 = hcd_to_sl811(hcd);
1630         struct resource         *res;
1631
1632         remove_debug_file(sl811);
1633         usb_remove_hcd(hcd);
1634
1635         /* some platforms may use IORESOURCE_IO */
1636         res = platform_get_resource(dev, IORESOURCE_MEM, 1);
1637         if (res)
1638                 iounmap(sl811->data_reg);
1639
1640         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1641         if (res)
1642                 iounmap(sl811->addr_reg);
1643
1644         usb_put_hcd(hcd);
1645         return 0;
1646 }
1647
1648 static int __devinit
1649 sl811h_probe(struct platform_device *dev)
1650 {
1651         struct usb_hcd          *hcd;
1652         struct sl811            *sl811;
1653         struct resource         *addr, *data;
1654         int                     irq;
1655         void __iomem            *addr_reg;
1656         void __iomem            *data_reg;
1657         int                     retval;
1658         u8                      tmp, ioaddr = 0;
1659
1660         /* basic sanity checks first.  board-specific init logic should
1661          * have initialized these three resources and probably board
1662          * specific platform_data.  we don't probe for IRQs, and do only
1663          * minimal sanity checking.
1664          */
1665         irq = platform_get_irq(dev, 0);
1666         if (dev->num_resources < 3 || irq < 0)
1667                 return -ENODEV;
1668
1669         /* refuse to confuse usbcore */
1670         if (dev->dev.dma_mask) {
1671                 DBG("no we won't dma\n");
1672                 return -EINVAL;
1673         }
1674
1675         /* the chip may be wired for either kind of addressing */
1676         addr = platform_get_resource(dev, IORESOURCE_MEM, 0);
1677         data = platform_get_resource(dev, IORESOURCE_MEM, 1);
1678         retval = -EBUSY;
1679         if (!addr || !data) {
1680                 addr = platform_get_resource(dev, IORESOURCE_IO, 0);
1681                 data = platform_get_resource(dev, IORESOURCE_IO, 1);
1682                 if (!addr || !data)
1683                         return -ENODEV;
1684                 ioaddr = 1;
1685                 /*
1686                  * NOTE: 64-bit resource->start is getting truncated
1687                  * to avoid compiler warning, assuming that ->start
1688                  * is always 32-bit for this case
1689                  */
1690                 addr_reg = (void __iomem *) (unsigned long) addr->start;
1691                 data_reg = (void __iomem *) (unsigned long) data->start;
1692         } else {
1693                 addr_reg = ioremap(addr->start, 1);
1694                 if (addr_reg == NULL) {
1695                         retval = -ENOMEM;
1696                         goto err2;
1697                 }
1698
1699                 data_reg = ioremap(data->start, 1);
1700                 if (data_reg == NULL) {
1701                         retval = -ENOMEM;
1702                         goto err4;
1703                 }
1704         }
1705
1706         /* allocate and initialize hcd */
1707         hcd = usb_create_hcd(&sl811h_hc_driver, &dev->dev, dev->dev.bus_id);
1708         if (!hcd) {
1709                 retval = -ENOMEM;
1710                 goto err5;
1711         }
1712         hcd->rsrc_start = addr->start;
1713         sl811 = hcd_to_sl811(hcd);
1714
1715         spin_lock_init(&sl811->lock);
1716         INIT_LIST_HEAD(&sl811->async);
1717         sl811->board = dev->dev.platform_data;
1718         init_timer(&sl811->timer);
1719         sl811->timer.function = sl811h_timer;
1720         sl811->timer.data = (unsigned long) sl811;
1721         sl811->addr_reg = addr_reg;
1722         sl811->data_reg = data_reg;
1723
1724         spin_lock_irq(&sl811->lock);
1725         port_power(sl811, 0);
1726         spin_unlock_irq(&sl811->lock);
1727         msleep(200);
1728
1729         tmp = sl811_read(sl811, SL11H_HWREVREG);
1730         switch (tmp >> 4) {
1731         case 1:
1732                 hcd->product_desc = "SL811HS v1.2";
1733                 break;
1734         case 2:
1735                 hcd->product_desc = "SL811HS v1.5";
1736                 break;
1737         default:
1738                 /* reject case 0, SL11S is less functional */
1739                 DBG("chiprev %02x\n", tmp);
1740                 retval = -ENXIO;
1741                 goto err6;
1742         }
1743
1744         /* The chip's IRQ is level triggered, active high.  A requirement
1745          * for platform device setup is to cope with things like signal
1746          * inverters (e.g. CF is active low) or working only with edge
1747          * triggers (e.g. most ARM CPUs).  Initial driver stress testing
1748          * was on a system with single edge triggering, so most sorts of
1749          * triggering arrangement should work.
1750          */
1751         retval = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
1752         if (retval != 0)
1753                 goto err6;
1754
1755         create_debug_file(sl811);
1756         return retval;
1757
1758  err6:
1759         usb_put_hcd(hcd);
1760  err5:
1761         if (!ioaddr)
1762                 iounmap(data_reg);
1763  err4:
1764         if (!ioaddr)
1765                 iounmap(addr_reg);
1766  err2:
1767         DBG("init error, %d\n", retval);
1768         return retval;
1769 }
1770
1771 #ifdef  CONFIG_PM
1772
1773 /* for this device there's no useful distinction between the controller
1774  * and its root hub, except that the root hub only gets direct PM calls
1775  * when CONFIG_USB_SUSPEND is enabled.
1776  */
1777
1778 static int
1779 sl811h_suspend(struct platform_device *dev, pm_message_t state)
1780 {
1781         struct usb_hcd  *hcd = platform_get_drvdata(dev);
1782         struct sl811    *sl811 = hcd_to_sl811(hcd);
1783         int             retval = 0;
1784
1785         switch (state.event) {
1786         case PM_EVENT_FREEZE:
1787                 retval = sl811h_bus_suspend(hcd);
1788                 break;
1789         case PM_EVENT_SUSPEND:
1790         case PM_EVENT_PRETHAW:          /* explicitly discard hw state */
1791                 port_power(sl811, 0);
1792                 break;
1793         }
1794         if (retval == 0)
1795                 dev->dev.power.power_state = state;
1796         return retval;
1797 }
1798
1799 static int
1800 sl811h_resume(struct platform_device *dev)
1801 {
1802         struct usb_hcd  *hcd = platform_get_drvdata(dev);
1803         struct sl811    *sl811 = hcd_to_sl811(hcd);
1804
1805         /* with no "check to see if VBUS is still powered" board hook,
1806          * let's assume it'd only be powered to enable remote wakeup.
1807          */
1808         if (dev->dev.power.power_state.event == PM_EVENT_SUSPEND
1809                         || !device_can_wakeup(&hcd->self.root_hub->dev)) {
1810                 sl811->port1 = 0;
1811                 port_power(sl811, 1);
1812                 usb_root_hub_lost_power(hcd->self.root_hub);
1813                 return 0;
1814         }
1815
1816         dev->dev.power.power_state = PMSG_ON;
1817         return sl811h_bus_resume(hcd);
1818 }
1819
1820 #else
1821
1822 #define sl811h_suspend  NULL
1823 #define sl811h_resume   NULL
1824
1825 #endif
1826
1827
1828 /* this driver is exported so sl811_cs can depend on it */
1829 struct platform_driver sl811h_driver = {
1830         .probe =        sl811h_probe,
1831         .remove =       __devexit_p(sl811h_remove),
1832
1833         .suspend =      sl811h_suspend,
1834         .resume =       sl811h_resume,
1835         .driver = {
1836                 .name = (char *) hcd_name,
1837                 .owner = THIS_MODULE,
1838         },
1839 };
1840 EXPORT_SYMBOL(sl811h_driver);
1841
1842 /*-------------------------------------------------------------------------*/
1843
1844 static int __init sl811h_init(void)
1845 {
1846         if (usb_disabled())
1847                 return -ENODEV;
1848
1849         INFO("driver %s, %s\n", hcd_name, DRIVER_VERSION);
1850         return platform_driver_register(&sl811h_driver);
1851 }
1852 module_init(sl811h_init);
1853
1854 static void __exit sl811h_cleanup(void)
1855 {
1856         platform_driver_unregister(&sl811h_driver);
1857 }
1858 module_exit(sl811h_cleanup);