git.oblomov.eu Git - linux-2.6/blob - 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/config.h>
  35 #include <linux/module.h>
  36 #include <linux/moduleparam.h>
  37 #include <linux/kernel.h>
  38 #include <linux/delay.h>
  39 #include <linux/ioport.h>
  40 #include <linux/sched.h>
  41 #include <linux/slab.h>
  42 #include <linux/smp_lock.h>
  43 #include <linux/errno.h>
  44 #include <linux/init.h>
  45 #include <linux/timer.h>
  46 #include <linux/list.h>
  47 #include <linux/interrupt.h>
  48 #include <linux/usb.h>
  49 #include <linux/usb_sl811.h>
  50 #include <linux/platform_device.h>
  51
  52 #include <asm/io.h>
  53 #include <asm/irq.h>
  54 #include <asm/system.h>
  55 #include <asm/byteorder.h>
  56
  57 #include "../core/hcd.h"
  58 #include "sl811.h"
  59
  60
  61 MODULE_DESCRIPTION("SL811HS USB Host Controller Driver");
  62 MODULE_LICENSE("GPL");
  63
  64 #define DRIVER_VERSION  "19 May 2005"
  65
  66
  67 #ifndef DEBUG
  68 #       define  STUB_DEBUG_FILE
  69 #endif
  70
  71 /* for now, use only one transfer register bank */
  72 #undef  USE_B
  73
  74 /* this doesn't understand urb->iso_frame_desc[], but if you had a driver
  75  * that just queued one ISO frame per URB then iso transfers "should" work
  76  * using the normal urb status fields.
  77  */
  78 #define DISABLE_ISO
  79
  80 // #define      QUIRK2
  81 #define QUIRK3
  82
  83 static const char hcd_name[] = "sl811-hcd";
  84
  85 /*-------------------------------------------------------------------------*/
  86
  87 static void port_power(struct sl811 *sl811, int is_on)
  88 {
  89         struct usb_hcd  *hcd = sl811_to_hcd(sl811);
  90
  91         /* hub is inactive unless the port is powered */
  92         if (is_on) {
  93                 if (sl811->port1 & (1 << USB_PORT_FEAT_POWER))
  94                         return;
  95
  96                 sl811->port1 = (1 << USB_PORT_FEAT_POWER);
  97                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
  98                 hcd->self.controller->power.power_state = PMSG_ON;
  99         } else {
 100                 sl811->port1 = 0;
 101                 sl811->irq_enable = 0;
 102                 hcd->state = HC_STATE_HALT;
 103                 hcd->self.controller->power.power_state = PMSG_SUSPEND;
 104         }
 105         sl811->ctrl1 = 0;
 106         sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
 107         sl811_write(sl811, SL11H_IRQ_STATUS, ~0);
 108
 109         if (sl811->board && sl811->board->port_power) {
 110                 /* switch VBUS, at 500mA unless hub power budget gets set */
 111                 DBG("power %s\n", is_on ? "on" : "off");
 112                 sl811->board->port_power(hcd->self.controller, is_on);
 113         }
 114
 115         /* reset as thoroughly as we can */
 116         if (sl811->board && sl811->board->reset)
 117                 sl811->board->reset(hcd->self.controller);
 118         else {
 119                 sl811_write(sl811, SL11H_CTLREG1, SL11H_CTL1MASK_SE0);
 120                 mdelay(20);
 121         }
 122
 123         sl811_write(sl811, SL11H_IRQ_ENABLE, 0);
 124         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
 125         sl811_write(sl811, SL811HS_CTLREG2, SL811HS_CTL2_INIT);
 126         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 127
 128         // if !is_on, put into lowpower mode now
 129 }
 130
 131 /*-------------------------------------------------------------------------*/
 132
 133 /* This is a PIO-only HCD.  Queueing appends URBs to the endpoint's queue,
 134  * and may start I/O.  Endpoint queues are scanned during completion irq
 135  * handlers (one per packet: ACK, NAK, faults, etc) and urb cancellation.
 136  *
 137  * Using an external DMA engine to copy a packet at a time could work,
 138  * though setup/teardown costs may be too big to make it worthwhile.
 139  */
 140
 141 /* SETUP starts a new control request.  Devices are not allowed to
 142  * STALL or NAK these; they must cancel any pending control requests.
 143  */
 144 static void setup_packet(
 145         struct sl811            *sl811,
 146         struct sl811h_ep        *ep,
 147         struct urb              *urb,
 148         u8                      bank,
 149         u8                      control
 150 )
 151 {
 152         u8                      addr;
 153         u8                      len;
 154         void __iomem            *data_reg;
 155
 156         addr = SL811HS_PACKET_BUF(bank == 0);
 157         len = sizeof(struct usb_ctrlrequest);
 158         data_reg = sl811->data_reg;
 159         sl811_write_buf(sl811, addr, urb->setup_packet, len);
 160
 161         /* autoincrementing */
 162         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
 163         writeb(len, data_reg);
 164         writeb(SL_SETUP /* | ep->epnum */, data_reg);
 165         writeb(usb_pipedevice(urb->pipe), data_reg);
 166
 167         /* always OUT/data0 */ ;
 168         sl811_write(sl811, bank + SL11H_HOSTCTLREG,
 169                         control | SL11H_HCTLMASK_OUT);
 170         ep->length = 0;
 171         PACKET("SETUP qh%p\n", ep);
 172 }
 173
 174 /* STATUS finishes control requests, often after IN or OUT data packets */
 175 static void status_packet(
 176         struct sl811            *sl811,
 177         struct sl811h_ep        *ep,
 178         struct urb              *urb,
 179         u8                      bank,
 180         u8                      control
 181 )
 182 {
 183         int                     do_out;
 184         void __iomem            *data_reg;
 185
 186         do_out = urb->transfer_buffer_length && usb_pipein(urb->pipe);
 187         data_reg = sl811->data_reg;
 188
 189         /* autoincrementing */
 190         sl811_write(sl811, bank + SL11H_BUFADDRREG, 0);
 191         writeb(0, data_reg);
 192         writeb((do_out ? SL_OUT : SL_IN) /* | ep->epnum */, data_reg);
 193         writeb(usb_pipedevice(urb->pipe), data_reg);
 194
 195         /* always data1; sometimes IN */
 196         control |= SL11H_HCTLMASK_TOGGLE;
 197         if (do_out)
 198                 control |= SL11H_HCTLMASK_OUT;
 199         sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
 200         ep->length = 0;
 201         PACKET("STATUS%s/%s qh%p\n", ep->nak_count ? "/retry" : "",
 202                         do_out ? "out" : "in", ep);
 203 }
 204
 205 /* IN packets can be used with any type of endpoint. here we just
 206  * start the transfer, data from the peripheral may arrive later.
 207  * urb->iso_frame_desc is currently ignored here...
 208  */
 209 static void in_packet(
 210         struct sl811            *sl811,
 211         struct sl811h_ep        *ep,
 212         struct urb              *urb,
 213         u8                      bank,
 214         u8                      control
 215 )
 216 {
 217         u8                      addr;
 218         u8                      len;
 219         void __iomem            *data_reg;
 220
 221         /* avoid losing data on overflow */
 222         len = ep->maxpacket;
 223         addr = SL811HS_PACKET_BUF(bank == 0);
 224         if (!(control & SL11H_HCTLMASK_ISOCH)
 225                         && usb_gettoggle(urb->dev, ep->epnum, 0))
 226                 control |= SL11H_HCTLMASK_TOGGLE;
 227         data_reg = sl811->data_reg;
 228
 229         /* autoincrementing */
 230         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
 231         writeb(len, data_reg);
 232         writeb(SL_IN | ep->epnum, data_reg);
 233         writeb(usb_pipedevice(urb->pipe), data_reg);
 234
 235         sl811_write(sl811, bank + SL11H_HOSTCTLREG, control);
 236         ep->length = min((int)len,
 237                         urb->transfer_buffer_length - urb->actual_length);
 238         PACKET("IN%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
 239                         !!usb_gettoggle(urb->dev, ep->epnum, 0), ep, len);
 240 }
 241
 242 /* OUT packets can be used with any type of endpoint.
 243  * urb->iso_frame_desc is currently ignored here...
 244  */
 245 static void out_packet(
 246         struct sl811            *sl811,
 247         struct sl811h_ep        *ep,
 248         struct urb              *urb,
 249         u8                      bank,
 250         u8                      control
 251 )
 252 {
 253         void                    *buf;
 254         u8                      addr;
 255         u8                      len;
 256         void __iomem            *data_reg;
 257
 258         buf = urb->transfer_buffer + urb->actual_length;
 259         prefetch(buf);
 260
 261         len = min((int)ep->maxpacket,
 262                         urb->transfer_buffer_length - urb->actual_length);
 263
 264         if (!(control & SL11H_HCTLMASK_ISOCH)
 265                         && usb_gettoggle(urb->dev, ep->epnum, 1))
 266                 control |= SL11H_HCTLMASK_TOGGLE;
 267         addr = SL811HS_PACKET_BUF(bank == 0);
 268         data_reg = sl811->data_reg;
 269
 270         sl811_write_buf(sl811, addr, buf, len);
 271
 272         /* autoincrementing */
 273         sl811_write(sl811, bank + SL11H_BUFADDRREG, addr);
 274         writeb(len, data_reg);
 275         writeb(SL_OUT | ep->epnum, data_reg);
 276         writeb(usb_pipedevice(urb->pipe), data_reg);
 277
 278         sl811_write(sl811, bank + SL11H_HOSTCTLREG,
 279                         control | SL11H_HCTLMASK_OUT);
 280         ep->length = len;
 281         PACKET("OUT%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "",
 282                         !!usb_gettoggle(urb->dev, ep->epnum, 1), ep, len);
 283 }
 284
 285 /*-------------------------------------------------------------------------*/
 286
 287 /* caller updates on-chip enables later */
 288
 289 static inline void sofirq_on(struct sl811 *sl811)
 290 {
 291         if (sl811->irq_enable & SL11H_INTMASK_SOFINTR)
 292                 return;
 293         VDBG("sof irq on\n");
 294         sl811->irq_enable |= SL11H_INTMASK_SOFINTR;
 295 }
 296
 297 static inline void sofirq_off(struct sl811 *sl811)
 298 {
 299         if (!(sl811->irq_enable & SL11H_INTMASK_SOFINTR))
 300                 return;
 301         VDBG("sof irq off\n");
 302         sl811->irq_enable &= ~SL11H_INTMASK_SOFINTR;
 303 }
 304
 305 /*-------------------------------------------------------------------------*/
 306
 307 /* pick the next endpoint for a transaction, and issue it.
 308  * frames start with periodic transfers (after whatever is pending
 309  * from the previous frame), and the rest of the time is async
 310  * transfers, scheduled round-robin.
 311  */
 312 static struct sl811h_ep *start(struct sl811 *sl811, u8 bank)
 313 {
 314         struct sl811h_ep        *ep;
 315         struct urb              *urb;
 316         int                     fclock;
 317         u8                      control;
 318
 319         /* use endpoint at schedule head */
 320         if (sl811->next_periodic) {
 321                 ep = sl811->next_periodic;
 322                 sl811->next_periodic = ep->next;
 323         } else {
 324                 if (sl811->next_async)
 325                         ep = sl811->next_async;
 326                 else if (!list_empty(&sl811->async))
 327                         ep = container_of(sl811->async.next,
 328                                         struct sl811h_ep, schedule);
 329                 else {
 330                         /* could set up the first fullspeed periodic
 331                          * transfer for the next frame ...
 332                          */
 333                         return NULL;
 334                 }
 335
 336 #ifdef USE_B
 337                 if ((bank && sl811->active_b == ep) || sl811->active_a == ep)
 338                         return NULL;
 339 #endif
 340
 341                 if (ep->schedule.next == &sl811->async)
 342                         sl811->next_async = NULL;
 343                 else
 344                         sl811->next_async = container_of(ep->schedule.next,
 345                                         struct sl811h_ep, schedule);
 346         }
 347
 348         if (unlikely(list_empty(&ep->hep->urb_list))) {
 349                 DBG("empty %p queue?\n", ep);
 350                 return NULL;
 351         }
 352
 353         urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
 354         control = ep->defctrl;
 355
 356         /* if this frame doesn't have enough time left to transfer this
 357          * packet, wait till the next frame.  too-simple algorithm...
 358          */
 359         fclock = sl811_read(sl811, SL11H_SOFTMRREG) << 6;
 360         fclock -= 100;          /* setup takes not much time */
 361         if (urb->dev->speed == USB_SPEED_LOW) {
 362                 if (control & SL11H_HCTLMASK_PREAMBLE) {
 363                         /* also note erratum 1: some hubs won't work */
 364                         fclock -= 800;
 365                 }
 366                 fclock -= ep->maxpacket << 8;
 367
 368                 /* erratum 2: AFTERSOF only works for fullspeed */
 369                 if (fclock < 0) {
 370                         if (ep->period)
 371                                 sl811->stat_overrun++;
 372                         sofirq_on(sl811);
 373                         return NULL;
 374                 }
 375         } else {
 376                 fclock -= 12000 / 19;   /* 19 64byte packets/msec */
 377                 if (fclock < 0) {
 378                         if (ep->period)
 379                                 sl811->stat_overrun++;
 380                         control |= SL11H_HCTLMASK_AFTERSOF;
 381
 382                 /* throttle bulk/control irq noise */
 383                 } else if (ep->nak_count)
 384                         control |= SL11H_HCTLMASK_AFTERSOF;
 385         }
 386
 387
 388         switch (ep->nextpid) {
 389         case USB_PID_IN:
 390                 in_packet(sl811, ep, urb, bank, control);
 391                 break;
 392         case USB_PID_OUT:
 393                 out_packet(sl811, ep, urb, bank, control);
 394                 break;
 395         case USB_PID_SETUP:
 396                 setup_packet(sl811, ep, urb, bank, control);
 397                 break;
 398         case USB_PID_ACK:               /* for control status */
 399                 status_packet(sl811, ep, urb, bank, control);
 400                 break;
 401         default:
 402                 DBG("bad ep%p pid %02x\n", ep, ep->nextpid);
 403                 ep = NULL;
 404         }
 405         return ep;
 406 }
 407
 408 #define MIN_JIFFIES     ((msecs_to_jiffies(2) > 1) ? msecs_to_jiffies(2) : 2)
 409
 410 static inline void start_transfer(struct sl811 *sl811)
 411 {
 412         if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND))
 413                 return;
 414         if (sl811->active_a == NULL) {
 415                 sl811->active_a = start(sl811, SL811_EP_A(SL811_HOST_BUF));
 416                 if (sl811->active_a != NULL)
 417                         sl811->jiffies_a = jiffies + MIN_JIFFIES;
 418         }
 419 #ifdef USE_B
 420         if (sl811->active_b == NULL) {
 421                 sl811->active_b = start(sl811, SL811_EP_B(SL811_HOST_BUF));
 422                 if (sl811->active_b != NULL)
 423                         sl811->jiffies_b = jiffies + MIN_JIFFIES;
 424         }
 425 #endif
 426 }
 427
 428 static void finish_request(
 429         struct sl811            *sl811,
 430         struct sl811h_ep        *ep,
 431         struct urb              *urb,
 432         struct pt_regs          *regs,
 433         int                     status
 434 ) __releases(sl811->lock) __acquires(sl811->lock)
 435 {
 436         unsigned                i;
 437
 438         if (usb_pipecontrol(urb->pipe))
 439                 ep->nextpid = USB_PID_SETUP;
 440
 441         spin_lock(&urb->lock);
 442         if (urb->status == -EINPROGRESS)
 443                 urb->status = status;
 444         urb->hcpriv = NULL;
 445         spin_unlock(&urb->lock);
 446
 447         spin_unlock(&sl811->lock);
 448         usb_hcd_giveback_urb(sl811_to_hcd(sl811), urb, regs);
 449         spin_lock(&sl811->lock);
 450
 451         /* leave active endpoints in the schedule */
 452         if (!list_empty(&ep->hep->urb_list))
 453                 return;
 454
 455         /* async deschedule? */
 456         if (!list_empty(&ep->schedule)) {
 457                 list_del_init(&ep->schedule);
 458                 if (ep == sl811->next_async)
 459                         sl811->next_async = NULL;
 460                 return;
 461         }
 462
 463         /* periodic deschedule */
 464         DBG("deschedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
 465         for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
 466                 struct sl811h_ep        *temp;
 467                 struct sl811h_ep        **prev = &sl811->periodic[i];
 468
 469                 while (*prev && ((temp = *prev) != ep))
 470                         prev = &temp->next;
 471                 if (*prev)
 472                         *prev = ep->next;
 473                 sl811->load[i] -= ep->load;
 474         }
 475         ep->branch = PERIODIC_SIZE;
 476         sl811->periodic_count--;
 477         sl811_to_hcd(sl811)->self.bandwidth_allocated
 478                 -= ep->load / ep->period;
 479         if (ep == sl811->next_periodic)
 480                 sl811->next_periodic = ep->next;
 481
 482         /* we might turn SOFs back on again for the async schedule */
 483         if (sl811->periodic_count == 0)
 484                 sofirq_off(sl811);
 485 }
 486
 487 static void
 488 done(struct sl811 *sl811, struct sl811h_ep *ep, u8 bank, struct pt_regs *regs)
 489 {
 490         u8                      status;
 491         struct urb              *urb;
 492         int                     urbstat = -EINPROGRESS;
 493
 494         if (unlikely(!ep))
 495                 return;
 496
 497         status = sl811_read(sl811, bank + SL11H_PKTSTATREG);
 498
 499         urb = container_of(ep->hep->urb_list.next, struct urb, urb_list);
 500
 501         /* we can safely ignore NAKs */
 502         if (status & SL11H_STATMASK_NAK) {
 503                 // PACKET("...NAK_%02x qh%p\n", bank, ep);
 504                 if (!ep->period)
 505                         ep->nak_count++;
 506                 ep->error_count = 0;
 507
 508         /* ACK advances transfer, toggle, and maybe queue */
 509         } else if (status & SL11H_STATMASK_ACK) {
 510                 struct usb_device       *udev = urb->dev;
 511                 int                     len;
 512                 unsigned char           *buf;
 513
 514                 /* urb->iso_frame_desc is currently ignored here... */
 515
 516                 ep->nak_count = ep->error_count = 0;
 517                 switch (ep->nextpid) {
 518                 case USB_PID_OUT:
 519                         // PACKET("...ACK/out_%02x qh%p\n", bank, ep);
 520                         urb->actual_length += ep->length;
 521                         usb_dotoggle(udev, ep->epnum, 1);
 522                         if (urb->actual_length
 523                                         == urb->transfer_buffer_length) {
 524                                 if (usb_pipecontrol(urb->pipe))
 525                                         ep->nextpid = USB_PID_ACK;
 526
 527                                 /* some bulk protocols terminate OUT transfers
 528                                  * by a short packet, using ZLPs not padding.
 529                                  */
 530                                 else if (ep->length < ep->maxpacket
 531                                                 || !(urb->transfer_flags
 532                                                         & URB_ZERO_PACKET))
 533                                         urbstat = 0;
 534                         }
 535                         break;
 536                 case USB_PID_IN:
 537                         // PACKET("...ACK/in_%02x qh%p\n", bank, ep);
 538                         buf = urb->transfer_buffer + urb->actual_length;
 539                         prefetchw(buf);
 540                         len = ep->maxpacket - sl811_read(sl811,
 541                                                 bank + SL11H_XFERCNTREG);
 542                         if (len > ep->length) {
 543                                 len = ep->length;
 544                                 urb->status = -EOVERFLOW;
 545                         }
 546                         urb->actual_length += len;
 547                         sl811_read_buf(sl811, SL811HS_PACKET_BUF(bank == 0),
 548                                         buf, len);
 549                         usb_dotoggle(udev, ep->epnum, 0);
 550                         if (urb->actual_length == urb->transfer_buffer_length)
 551                                 urbstat = 0;
 552                         else if (len < ep->maxpacket) {
 553                                 if (urb->transfer_flags & URB_SHORT_NOT_OK)
 554                                         urbstat = -EREMOTEIO;
 555                                 else
 556                                         urbstat = 0;
 557                         }
 558                         if (usb_pipecontrol(urb->pipe)
 559                                         && (urbstat == -EREMOTEIO
 560                                                 || urbstat == 0)) {
 561
 562                                 /* NOTE if the status stage STALLs (why?),
 563                                  * this reports the wrong urb status.
 564                                  */
 565                                 spin_lock(&urb->lock);
 566                                 if (urb->status == -EINPROGRESS)
 567                                         urb->status = urbstat;
 568                                 spin_unlock(&urb->lock);
 569
 570                                 urb = NULL;
 571                                 ep->nextpid = USB_PID_ACK;
 572                         }
 573                         break;
 574                 case USB_PID_SETUP:
 575                         // PACKET("...ACK/setup_%02x qh%p\n", bank, ep);
 576                         if (urb->transfer_buffer_length == urb->actual_length)
 577                                 ep->nextpid = USB_PID_ACK;
 578                         else if (usb_pipeout(urb->pipe)) {
 579                                 usb_settoggle(udev, 0, 1, 1);
 580                                 ep->nextpid = USB_PID_OUT;
 581                         } else {
 582                                 usb_settoggle(udev, 0, 0, 1);
 583                                 ep->nextpid = USB_PID_IN;
 584                         }
 585                         break;
 586                 case USB_PID_ACK:
 587                         // PACKET("...ACK/status_%02x qh%p\n", bank, ep);
 588                         urbstat = 0;
 589                         break;
 590                 }
 591
 592         /* STALL stops all transfers */
 593         } else if (status & SL11H_STATMASK_STALL) {
 594                 PACKET("...STALL_%02x qh%p\n", bank, ep);
 595                 ep->nak_count = ep->error_count = 0;
 596                 urbstat = -EPIPE;
 597
 598         /* error? retry, until "3 strikes" */
 599         } else if (++ep->error_count >= 3) {
 600                 if (status & SL11H_STATMASK_TMOUT)
 601                         urbstat = -ETIMEDOUT;
 602                 else if (status & SL11H_STATMASK_OVF)
 603                         urbstat = -EOVERFLOW;
 604                 else
 605                         urbstat = -EPROTO;
 606                 ep->error_count = 0;
 607                 PACKET("...3STRIKES_%02x %02x qh%p stat %d\n",
 608                                 bank, status, ep, urbstat);
 609         }
 610
 611         if (urb && (urbstat != -EINPROGRESS || urb->status != -EINPROGRESS))
 612                 finish_request(sl811, ep, urb, regs, urbstat);
 613 }
 614
 615 static inline u8 checkdone(struct sl811 *sl811)
 616 {
 617         u8      ctl;
 618         u8      irqstat = 0;
 619
 620         if (sl811->active_a && time_before_eq(sl811->jiffies_a, jiffies)) {
 621                 ctl = sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG));
 622                 if (ctl & SL11H_HCTLMASK_ARM)
 623                         sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
 624                 DBG("%s DONE_A: ctrl %02x sts %02x\n",
 625                         (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
 626                         ctl,
 627                         sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
 628                 irqstat |= SL11H_INTMASK_DONE_A;
 629         }
 630 #ifdef  USE_B
 631         if (sl811->active_b && time_before_eq(sl811->jiffies_b, jiffies)) {
 632                 ctl = sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG));
 633                 if (ctl & SL11H_HCTLMASK_ARM)
 634                         sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
 635                 DBG("%s DONE_B: ctrl %02x sts %02x\n",
 636                         (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost",
 637                         ctl,
 638                         sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
 639                 irqstat |= SL11H_INTMASK_DONE_A;
 640         }
 641 #endif
 642         return irqstat;
 643 }
 644
 645 static irqreturn_t sl811h_irq(struct usb_hcd *hcd, struct pt_regs *regs)
 646 {
 647         struct sl811    *sl811 = hcd_to_sl811(hcd);
 648         u8              irqstat;
 649         irqreturn_t     ret = IRQ_NONE;
 650         unsigned        retries = 5;
 651
 652         spin_lock(&sl811->lock);
 653
 654 retry:
 655         irqstat = sl811_read(sl811, SL11H_IRQ_STATUS) & ~SL11H_INTMASK_DP;
 656         if (irqstat) {
 657                 sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
 658                 irqstat &= sl811->irq_enable;
 659         }
 660
 661 #ifdef  QUIRK2
 662         /* this may no longer be necessary ... */
 663         if (irqstat == 0) {
 664                 irqstat = checkdone(sl811);
 665                 if (irqstat)
 666                         sl811->stat_lost++;
 667         }
 668 #endif
 669
 670         /* USB packets, not necessarily handled in the order they're
 671          * issued ... that's fine if they're different endpoints.
 672          */
 673         if (irqstat & SL11H_INTMASK_DONE_A) {
 674                 done(sl811, sl811->active_a, SL811_EP_A(SL811_HOST_BUF), regs);
 675                 sl811->active_a = NULL;
 676                 sl811->stat_a++;
 677         }
 678 #ifdef USE_B
 679         if (irqstat & SL11H_INTMASK_DONE_B) {
 680                 done(sl811, sl811->active_b, SL811_EP_B(SL811_HOST_BUF), regs);
 681                 sl811->active_b = NULL;
 682                 sl811->stat_b++;
 683         }
 684 #endif
 685         if (irqstat & SL11H_INTMASK_SOFINTR) {
 686                 unsigned index;
 687
 688                 index = sl811->frame++ % (PERIODIC_SIZE - 1);
 689                 sl811->stat_sof++;
 690
 691                 /* be graceful about almost-inevitable periodic schedule
 692                  * overruns:  continue the previous frame's transfers iff
 693                  * this one has nothing scheduled.
 694                  */
 695                 if (sl811->next_periodic) {
 696                         // ERR("overrun to slot %d\n", index);
 697                         sl811->stat_overrun++;
 698                 }
 699                 if (sl811->periodic[index])
 700                         sl811->next_periodic = sl811->periodic[index];
 701         }
 702
 703         /* khubd manages debouncing and wakeup */
 704         if (irqstat & SL11H_INTMASK_INSRMV) {
 705                 sl811->stat_insrmv++;
 706
 707                 /* most stats are reset for each VBUS session */
 708                 sl811->stat_wake = 0;
 709                 sl811->stat_sof = 0;
 710                 sl811->stat_a = 0;
 711                 sl811->stat_b = 0;
 712                 sl811->stat_lost = 0;
 713
 714                 sl811->ctrl1 = 0;
 715                 sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
 716
 717                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
 718                 sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 719
 720                 /* usbcore nukes other pending transactions on disconnect */
 721                 if (sl811->active_a) {
 722                         sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0);
 723                         finish_request(sl811, sl811->active_a,
 724                                 container_of(sl811->active_a
 725                                                 ->hep->urb_list.next,
 726                                         struct urb, urb_list),
 727                                 NULL, -ESHUTDOWN);
 728                         sl811->active_a = NULL;
 729                 }
 730 #ifdef  USE_B
 731                 if (sl811->active_b) {
 732                         sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0);
 733                         finish_request(sl811, sl811->active_b,
 734                                 container_of(sl811->active_b
 735                                                 ->hep->urb_list.next,
 736                                         struct urb, urb_list),
 737                                 NULL, -ESHUTDOWN);
 738                         sl811->active_b = NULL;
 739                 }
 740 #endif
 741
 742                 /* port status seems weird until after reset, so
 743                  * force the reset and make khubd clean up later.
 744                  */
 745                 sl811->port1 |= (1 << USB_PORT_FEAT_C_CONNECTION)
 746                                 | (1 << USB_PORT_FEAT_CONNECTION);
 747
 748         } else if (irqstat & SL11H_INTMASK_RD) {
 749                 if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND)) {
 750                         DBG("wakeup\n");
 751                         sl811->port1 |= 1 << USB_PORT_FEAT_C_SUSPEND;
 752                         sl811->stat_wake++;
 753                 } else
 754                         irqstat &= ~SL11H_INTMASK_RD;
 755         }
 756
 757         if (irqstat) {
 758                 if (sl811->port1 & (1 << USB_PORT_FEAT_ENABLE))
 759                         start_transfer(sl811);
 760                 ret = IRQ_HANDLED;
 761                 if (retries--)
 762                         goto retry;
 763         }
 764
 765         if (sl811->periodic_count == 0 && list_empty(&sl811->async))
 766                 sofirq_off(sl811);
 767         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 768
 769         spin_unlock(&sl811->lock);
 770
 771         return ret;
 772 }
 773
 774 /*-------------------------------------------------------------------------*/
 775
 776 /* usb 1.1 says max 90% of a frame is available for periodic transfers.
 777  * this driver doesn't promise that much since it's got to handle an
 778  * IRQ per packet; irq handling latencies also use up that time.
 779  *
 780  * NOTE:  the periodic schedule is a sparse tree, with the load for
 781  * each branch minimized.  see fig 3.5 in the OHCI spec for example.
 782  */
 783 #define MAX_PERIODIC_LOAD       500     /* out of 1000 usec */
 784
 785 static int balance(struct sl811 *sl811, u16 period, u16 load)
 786 {
 787         int     i, branch = -ENOSPC;
 788
 789         /* search for the least loaded schedule branch of that period
 790          * which has enough bandwidth left unreserved.
 791          */
 792         for (i = 0; i < period ; i++) {
 793                 if (branch < 0 || sl811->load[branch] > sl811->load[i]) {
 794                         int     j;
 795
 796                         for (j = i; j < PERIODIC_SIZE; j += period) {
 797                                 if ((sl811->load[j] + load)
 798                                                 > MAX_PERIODIC_LOAD)
 799                                         break;
 800                         }
 801                         if (j < PERIODIC_SIZE)
 802                                 continue;
 803                         branch = i;
 804                 }
 805         }
 806         return branch;
 807 }
 808
 809 /*-------------------------------------------------------------------------*/
 810
 811 static int sl811h_urb_enqueue(
 812         struct usb_hcd          *hcd,
 813         struct usb_host_endpoint *hep,
 814         struct urb              *urb,
 815         gfp_t                   mem_flags
 816 ) {
 817         struct sl811            *sl811 = hcd_to_sl811(hcd);
 818         struct usb_device       *udev = urb->dev;
 819         unsigned int            pipe = urb->pipe;
 820         int                     is_out = !usb_pipein(pipe);
 821         int                     type = usb_pipetype(pipe);
 822         int                     epnum = usb_pipeendpoint(pipe);
 823         struct sl811h_ep        *ep = NULL;
 824         unsigned long           flags;
 825         int                     i;
 826         int                     retval = 0;
 827
 828 #ifdef  DISABLE_ISO
 829         if (type == PIPE_ISOCHRONOUS)
 830                 return -ENOSPC;
 831 #endif
 832
 833         /* avoid all allocations within spinlocks */
 834         if (!hep->hcpriv)
 835                 ep = kzalloc(sizeof *ep, mem_flags);
 836
 837         spin_lock_irqsave(&sl811->lock, flags);
 838
 839         /* don't submit to a dead or disabled port */
 840         if (!(sl811->port1 & (1 << USB_PORT_FEAT_ENABLE))
 841                         || !HC_IS_RUNNING(hcd->state)) {
 842                 retval = -ENODEV;
 843                 kfree(ep);
 844                 goto fail;
 845         }
 846
 847         if (hep->hcpriv) {
 848                 kfree(ep);
 849                 ep = hep->hcpriv;
 850         } else if (!ep) {
 851                 retval = -ENOMEM;
 852                 goto fail;
 853
 854         } else {
 855                 INIT_LIST_HEAD(&ep->schedule);
 856                 ep->udev = usb_get_dev(udev);
 857                 ep->epnum = epnum;
 858                 ep->maxpacket = usb_maxpacket(udev, urb->pipe, is_out);
 859                 ep->defctrl = SL11H_HCTLMASK_ARM | SL11H_HCTLMASK_ENABLE;
 860                 usb_settoggle(udev, epnum, is_out, 0);
 861
 862                 if (type == PIPE_CONTROL)
 863                         ep->nextpid = USB_PID_SETUP;
 864                 else if (is_out)
 865                         ep->nextpid = USB_PID_OUT;
 866                 else
 867                         ep->nextpid = USB_PID_IN;
 868
 869                 if (ep->maxpacket > H_MAXPACKET) {
 870                         /* iso packets up to 240 bytes could work... */
 871                         DBG("dev %d ep%d maxpacket %d\n",
 872                                 udev->devnum, epnum, ep->maxpacket);
 873                         retval = -EINVAL;
 874                         goto fail;
 875                 }
 876
 877                 if (udev->speed == USB_SPEED_LOW) {
 878                         /* send preamble for external hub? */
 879                         if (!(sl811->ctrl1 & SL11H_CTL1MASK_LSPD))
 880                                 ep->defctrl |= SL11H_HCTLMASK_PREAMBLE;
 881                 }
 882                 switch (type) {
 883                 case PIPE_ISOCHRONOUS:
 884                 case PIPE_INTERRUPT:
 885                         if (urb->interval > PERIODIC_SIZE)
 886                                 urb->interval = PERIODIC_SIZE;
 887                         ep->period = urb->interval;
 888                         ep->branch = PERIODIC_SIZE;
 889                         if (type == PIPE_ISOCHRONOUS)
 890                                 ep->defctrl |= SL11H_HCTLMASK_ISOCH;
 891                         ep->load = usb_calc_bus_time(udev->speed, !is_out,
 892                                 (type == PIPE_ISOCHRONOUS),
 893                                 usb_maxpacket(udev, pipe, is_out))
 894                                         / 1000;
 895                         break;
 896                 }
 897
 898                 ep->hep = hep;
 899                 hep->hcpriv = ep;
 900         }
 901
 902         /* maybe put endpoint into schedule */
 903         switch (type) {
 904         case PIPE_CONTROL:
 905         case PIPE_BULK:
 906                 if (list_empty(&ep->schedule))
 907                         list_add_tail(&ep->schedule, &sl811->async);
 908                 break;
 909         case PIPE_ISOCHRONOUS:
 910         case PIPE_INTERRUPT:
 911                 urb->interval = ep->period;
 912                 if (ep->branch < PERIODIC_SIZE) {
 913                         /* NOTE:  the phase is correct here, but the value
 914                          * needs offsetting by the transfer queue depth.
 915                          * All current drivers ignore start_frame, so this
 916                          * is unlikely to ever matter...
 917                          */
 918                         urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
 919                                                 + ep->branch;
 920                         break;
 921                 }
 922
 923                 retval = balance(sl811, ep->period, ep->load);
 924                 if (retval < 0)
 925                         goto fail;
 926                 ep->branch = retval;
 927                 retval = 0;
 928                 urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1))
 929                                         + ep->branch;
 930
 931                 /* sort each schedule branch by period (slow before fast)
 932                  * to share the faster parts of the tree without needing
 933                  * dummy/placeholder nodes
 934                  */
 935                 DBG("schedule qh%d/%p branch %d\n", ep->period, ep, ep->branch);
 936                 for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) {
 937                         struct sl811h_ep        **prev = &sl811->periodic[i];
 938                         struct sl811h_ep        *here = *prev;
 939
 940                         while (here && ep != here) {
 941                                 if (ep->period > here->period)
 942                                         break;
 943                                 prev = &here->next;
 944                                 here = *prev;
 945                         }
 946                         if (ep != here) {
 947                                 ep->next = here;
 948                                 *prev = ep;
 949                         }
 950                         sl811->load[i] += ep->load;
 951                 }
 952                 sl811->periodic_count++;
 953                 hcd->self.bandwidth_allocated += ep->load / ep->period;
 954                 sofirq_on(sl811);
 955         }
 956
 957         /* in case of unlink-during-submit */
 958         spin_lock(&urb->lock);
 959         if (urb->status != -EINPROGRESS) {
 960                 spin_unlock(&urb->lock);
 961                 finish_request(sl811, ep, urb, NULL, 0);
 962                 retval = 0;
 963                 goto fail;
 964         }
 965         urb->hcpriv = hep;
 966         spin_unlock(&urb->lock);
 967
 968         start_transfer(sl811);
 969         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
 970 fail:
 971         spin_unlock_irqrestore(&sl811->lock, flags);
 972         return retval;
 973 }
 974
 975 static int sl811h_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
 976 {
 977         struct sl811            *sl811 = hcd_to_sl811(hcd);
 978         struct usb_host_endpoint *hep;
 979         unsigned long           flags;
 980         struct sl811h_ep        *ep;
 981         int                     retval = 0;
 982
 983         spin_lock_irqsave(&sl811->lock, flags);
 984         hep = urb->hcpriv;
 985         if (!hep)
 986                 goto fail;
 987
 988         ep = hep->hcpriv;
 989         if (ep) {
 990                 /* finish right away if this urb can't be active ...
 991                  * note that some drivers wrongly expect delays
 992                  */
 993                 if (ep->hep->urb_list.next != &urb->urb_list) {
 994                         /* not front of queue?  never active */
 995
 996                 /* for active transfers, we expect an IRQ */
 997                 } else if (sl811->active_a == ep) {
 998                         if (time_before_eq(sl811->jiffies_a, jiffies)) {
 999                                 /* happens a lot with lowspeed?? */
1000                                 DBG("giveup on DONE_A: ctrl %02x sts %02x\n",
1001                                         sl811_read(sl811,
1002                                                 SL811_EP_A(SL11H_HOSTCTLREG)),
1003                                         sl811_read(sl811,
1004                                                 SL811_EP_A(SL11H_PKTSTATREG)));
1005                                 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
1006                                                 0);
1007                                 sl811->active_a = NULL;
1008                         } else
1009                                 urb = NULL;
1010 #ifdef  USE_B
1011                 } else if (sl811->active_b == ep) {
1012                         if (time_before_eq(sl811->jiffies_a, jiffies)) {
1013                                 /* happens a lot with lowspeed?? */
1014                                 DBG("giveup on DONE_B: ctrl %02x sts %02x\n",
1015                                         sl811_read(sl811,
1016                                                 SL811_EP_B(SL11H_HOSTCTLREG)),
1017                                         sl811_read(sl811,
1018                                                 SL811_EP_B(SL11H_PKTSTATREG)));
1019                                 sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG),
1020                                                 0);
1021                                 sl811->active_b = NULL;
1022                         } else
1023                                 urb = NULL;
1024 #endif
1025                 } else {
1026                         /* front of queue for inactive endpoint */
1027                 }
1028
1029                 if (urb)
1030                         finish_request(sl811, ep, urb, NULL, 0);
1031                 else
1032                         VDBG("dequeue, urb %p active %s; wait4irq\n", urb,
1033                                 (sl811->active_a == ep) ? "A" : "B");
1034         } else
1035 fail:
1036                 retval = -EINVAL;
1037         spin_unlock_irqrestore(&sl811->lock, flags);
1038         return retval;
1039 }
1040
1041 static void
1042 sl811h_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
1043 {
1044         struct sl811h_ep        *ep = hep->hcpriv;
1045
1046         if (!ep)
1047                 return;
1048
1049         /* assume we'd just wait for the irq */
1050         if (!list_empty(&hep->urb_list))
1051                 msleep(3);
1052         if (!list_empty(&hep->urb_list))
1053                 WARN("ep %p not empty?\n", ep);
1054
1055         usb_put_dev(ep->udev);
1056         kfree(ep);
1057         hep->hcpriv = NULL;
1058 }
1059
1060 static int
1061 sl811h_get_frame(struct usb_hcd *hcd)
1062 {
1063         struct sl811 *sl811 = hcd_to_sl811(hcd);
1064
1065         /* wrong except while periodic transfers are scheduled;
1066          * never matches the on-the-wire frame;
1067          * subject to overruns.
1068          */
1069         return sl811->frame;
1070 }
1071
1072
1073 /*-------------------------------------------------------------------------*/
1074
1075 /* the virtual root hub timer IRQ checks for hub status */
1076 static int
1077 sl811h_hub_status_data(struct usb_hcd *hcd, char *buf)
1078 {
1079         struct sl811 *sl811 = hcd_to_sl811(hcd);
1080 #ifdef  QUIRK3
1081         unsigned long flags;
1082
1083         /* non-SMP HACK: use root hub timer as i/o watchdog
1084          * this seems essential when SOF IRQs aren't in use...
1085          */
1086         local_irq_save(flags);
1087         if (!timer_pending(&sl811->timer)) {
1088                 if (sl811h_irq( /* ~0, */ hcd, NULL) != IRQ_NONE)
1089                         sl811->stat_lost++;
1090         }
1091         local_irq_restore(flags);
1092 #endif
1093
1094         if (!(sl811->port1 & (0xffff << 16)))
1095                 return 0;
1096
1097         /* tell khubd port 1 changed */
1098         *buf = (1 << 1);
1099         return 1;
1100 }
1101
1102 static void
1103 sl811h_hub_descriptor (
1104         struct sl811                    *sl811,
1105         struct usb_hub_descriptor       *desc
1106 ) {
1107         u16             temp = 0;
1108
1109         desc->bDescriptorType = 0x29;
1110         desc->bHubContrCurrent = 0;
1111
1112         desc->bNbrPorts = 1;
1113         desc->bDescLength = 9;
1114
1115         /* per-port power switching (gang of one!), or none */
1116         desc->bPwrOn2PwrGood = 0;
1117         if (sl811->board && sl811->board->port_power) {
1118                 desc->bPwrOn2PwrGood = sl811->board->potpg;
1119                 if (!desc->bPwrOn2PwrGood)
1120                         desc->bPwrOn2PwrGood = 10;
1121                 temp = 0x0001;
1122         } else
1123                 temp = 0x0002;
1124
1125         /* no overcurrent errors detection/handling */
1126         temp |= 0x0010;
1127
1128         desc->wHubCharacteristics = (__force __u16)cpu_to_le16(temp);
1129
1130         /* two bitmaps:  ports removable, and legacy PortPwrCtrlMask */
1131         desc->bitmap[0] = 0 << 1;
1132         desc->bitmap[1] = ~0;
1133 }
1134
1135 static void
1136 sl811h_timer(unsigned long _sl811)
1137 {
1138         struct sl811    *sl811 = (void *) _sl811;
1139         unsigned long   flags;
1140         u8              irqstat;
1141         u8              signaling = sl811->ctrl1 & SL11H_CTL1MASK_FORCE;
1142         const u32       mask = (1 << USB_PORT_FEAT_CONNECTION)
1143                                 | (1 << USB_PORT_FEAT_ENABLE)
1144                                 | (1 << USB_PORT_FEAT_LOWSPEED);
1145
1146         spin_lock_irqsave(&sl811->lock, flags);
1147
1148         /* stop special signaling */
1149         sl811->ctrl1 &= ~SL11H_CTL1MASK_FORCE;
1150         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1151         udelay(3);
1152
1153         irqstat = sl811_read(sl811, SL11H_IRQ_STATUS);
1154
1155         switch (signaling) {
1156         case SL11H_CTL1MASK_SE0:
1157                 DBG("end reset\n");
1158                 sl811->port1 = (1 << USB_PORT_FEAT_C_RESET)
1159                                 | (1 << USB_PORT_FEAT_POWER);
1160                 sl811->ctrl1 = 0;
1161                 /* don't wrongly ack RD */
1162                 if (irqstat & SL11H_INTMASK_INSRMV)
1163                         irqstat &= ~SL11H_INTMASK_RD;
1164                 break;
1165         case SL11H_CTL1MASK_K:
1166                 DBG("end resume\n");
1167                 sl811->port1 &= ~(1 << USB_PORT_FEAT_SUSPEND);
1168                 break;
1169         default:
1170                 DBG("odd timer signaling: %02x\n", signaling);
1171                 break;
1172         }
1173         sl811_write(sl811, SL11H_IRQ_STATUS, irqstat);
1174
1175         if (irqstat & SL11H_INTMASK_RD) {
1176                 /* usbcore nukes all pending transactions on disconnect */
1177                 if (sl811->port1 & (1 << USB_PORT_FEAT_CONNECTION))
1178                         sl811->port1 |= (1 << USB_PORT_FEAT_C_CONNECTION)
1179                                         | (1 << USB_PORT_FEAT_C_ENABLE);
1180                 sl811->port1 &= ~mask;
1181                 sl811->irq_enable = SL11H_INTMASK_INSRMV;
1182         } else {
1183                 sl811->port1 |= mask;
1184                 if (irqstat & SL11H_INTMASK_DP)
1185                         sl811->port1 &= ~(1 << USB_PORT_FEAT_LOWSPEED);
1186                 sl811->irq_enable = SL11H_INTMASK_INSRMV | SL11H_INTMASK_RD;
1187         }
1188
1189         if (sl811->port1 & (1 << USB_PORT_FEAT_CONNECTION)) {
1190                 u8      ctrl2 = SL811HS_CTL2_INIT;
1191
1192                 sl811->irq_enable |= SL11H_INTMASK_DONE_A;
1193 #ifdef USE_B
1194                 sl811->irq_enable |= SL11H_INTMASK_DONE_B;
1195 #endif
1196                 if (sl811->port1 & (1 << USB_PORT_FEAT_LOWSPEED)) {
1197                         sl811->ctrl1 |= SL11H_CTL1MASK_LSPD;
1198                         ctrl2 |= SL811HS_CTL2MASK_DSWAP;
1199                 }
1200
1201                 /* start SOFs flowing, kickstarting with A registers */
1202                 sl811->ctrl1 |= SL11H_CTL1MASK_SOF_ENA;
1203                 sl811_write(sl811, SL11H_SOFLOWREG, 0xe0);
1204                 sl811_write(sl811, SL811HS_CTLREG2, ctrl2);
1205
1206                 /* autoincrementing */
1207                 sl811_write(sl811, SL811_EP_A(SL11H_BUFLNTHREG), 0);
1208                 writeb(SL_SOF, sl811->data_reg);
1209                 writeb(0, sl811->data_reg);
1210                 sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG),
1211                                 SL11H_HCTLMASK_ARM);
1212
1213                 /* khubd provides debounce delay */
1214         } else {
1215                 sl811->ctrl1 = 0;
1216         }
1217         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1218
1219         /* reenable irqs */
1220         sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable);
1221         spin_unlock_irqrestore(&sl811->lock, flags);
1222 }
1223
1224 static int
1225 sl811h_hub_control(
1226         struct usb_hcd  *hcd,
1227         u16             typeReq,
1228         u16             wValue,
1229         u16             wIndex,
1230         char            *buf,
1231         u16             wLength
1232 ) {
1233         struct sl811    *sl811 = hcd_to_sl811(hcd);
1234         int             retval = 0;
1235         unsigned long   flags;
1236
1237         spin_lock_irqsave(&sl811->lock, flags);
1238
1239         switch (typeReq) {
1240         case ClearHubFeature:
1241         case SetHubFeature:
1242                 switch (wValue) {
1243                 case C_HUB_OVER_CURRENT:
1244                 case C_HUB_LOCAL_POWER:
1245                         break;
1246                 default:
1247                         goto error;
1248                 }
1249                 break;
1250         case ClearPortFeature:
1251                 if (wIndex != 1 || wLength != 0)
1252                         goto error;
1253
1254                 switch (wValue) {
1255                 case USB_PORT_FEAT_ENABLE:
1256                         sl811->port1 &= (1 << USB_PORT_FEAT_POWER);
1257                         sl811->ctrl1 = 0;
1258                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1259                         sl811->irq_enable = SL11H_INTMASK_INSRMV;
1260                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1261                                                 sl811->irq_enable);
1262                         break;
1263                 case USB_PORT_FEAT_SUSPEND:
1264                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND)))
1265                                 break;
1266
1267                         /* 20 msec of resume/K signaling, other irqs blocked */
1268                         DBG("start resume...\n");
1269                         sl811->irq_enable = 0;
1270                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1271                                                 sl811->irq_enable);
1272                         sl811->ctrl1 |= SL11H_CTL1MASK_K;
1273                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1274
1275                         mod_timer(&sl811->timer, jiffies
1276                                         + msecs_to_jiffies(20));
1277                         break;
1278                 case USB_PORT_FEAT_POWER:
1279                         port_power(sl811, 0);
1280                         break;
1281                 case USB_PORT_FEAT_C_ENABLE:
1282                 case USB_PORT_FEAT_C_SUSPEND:
1283                 case USB_PORT_FEAT_C_CONNECTION:
1284                 case USB_PORT_FEAT_C_OVER_CURRENT:
1285                 case USB_PORT_FEAT_C_RESET:
1286                         break;
1287                 default:
1288                         goto error;
1289                 }
1290                 sl811->port1 &= ~(1 << wValue);
1291                 break;
1292         case GetHubDescriptor:
1293                 sl811h_hub_descriptor(sl811, (struct usb_hub_descriptor *) buf);
1294                 break;
1295         case GetHubStatus:
1296                 *(__le32 *) buf = cpu_to_le32(0);
1297                 break;
1298         case GetPortStatus:
1299                 if (wIndex != 1)
1300                         goto error;
1301                 *(__le32 *) buf = cpu_to_le32(sl811->port1);
1302
1303 #ifndef VERBOSE
1304         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
1305 #endif
1306                 DBG("GetPortStatus %08x\n", sl811->port1);
1307                 break;
1308         case SetPortFeature:
1309                 if (wIndex != 1 || wLength != 0)
1310                         goto error;
1311                 switch (wValue) {
1312                 case USB_PORT_FEAT_SUSPEND:
1313                         if (sl811->port1 & (1 << USB_PORT_FEAT_RESET))
1314                                 goto error;
1315                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_ENABLE)))
1316                                 goto error;
1317
1318                         DBG("suspend...\n");
1319                         sl811->ctrl1 &= ~SL11H_CTL1MASK_SOF_ENA;
1320                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1321                         break;
1322                 case USB_PORT_FEAT_POWER:
1323                         port_power(sl811, 1);
1324                         break;
1325                 case USB_PORT_FEAT_RESET:
1326                         if (sl811->port1 & (1 << USB_PORT_FEAT_SUSPEND))
1327                                 goto error;
1328                         if (!(sl811->port1 & (1 << USB_PORT_FEAT_POWER)))
1329                                 break;
1330
1331                         /* 50 msec of reset/SE0 signaling, irqs blocked */
1332                         sl811->irq_enable = 0;
1333                         sl811_write(sl811, SL11H_IRQ_ENABLE,
1334                                                 sl811->irq_enable);
1335                         sl811->ctrl1 = SL11H_CTL1MASK_SE0;
1336                         sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1);
1337                         sl811->port1 |= (1 << USB_PORT_FEAT_RESET);
1338                         mod_timer(&sl811->timer, jiffies
1339                                         + msecs_to_jiffies(50));
1340                         break;
1341                 default:
1342                         goto error;
1343                 }
1344                 sl811->port1 |= 1 << wValue;
1345                 break;
1346
1347         default:
1348 error:
1349                 /* "protocol stall" on error */
1350                 retval = -EPIPE;
1351         }
1352
1353         spin_unlock_irqrestore(&sl811->lock, flags);
1354         return retval;
1355 }
1356
1357 #ifdef  CONFIG_PM
1358
1359 static int
1360 sl811h_bus_suspend(struct usb_hcd *hcd)
1361 {
1362         // SOFs off
1363         DBG("%s\n", __FUNCTION__);
1364         return 0;
1365 }
1366
1367 static int
1368 sl811h_bus_resume(struct usb_hcd *hcd)
1369 {
1370         // SOFs on
1371         DBG("%s\n", __FUNCTION__);
1372         return 0;
1373 }
1374
1375 #else
1376
1377 #define sl811h_bus_suspend      NULL
1378 #define sl811h_bus_resume       NULL
1379
1380 #endif
1381
1382
1383 /*-------------------------------------------------------------------------*/
1384
1385 #ifdef STUB_DEBUG_FILE
1386
1387 static inline void create_debug_file(struct sl811 *sl811) { }
1388 static inline void remove_debug_file(struct sl811 *sl811) { }
1389
1390 #else
1391
1392 #include <linux/proc_fs.h>
1393 #include <linux/seq_file.h>
1394
1395 static void dump_irq(struct seq_file *s, char *label, u8 mask)
1396 {
1397         seq_printf(s, "%s %02x%s%s%s%s%s%s\n", label, mask,
1398                 (mask & SL11H_INTMASK_DONE_A) ? " done_a" : "",
1399                 (mask & SL11H_INTMASK_DONE_B) ? " done_b" : "",
1400                 (mask & SL11H_INTMASK_SOFINTR) ? " sof" : "",
1401                 (mask & SL11H_INTMASK_INSRMV) ? " ins/rmv" : "",
1402                 (mask & SL11H_INTMASK_RD) ? " rd" : "",
1403                 (mask & SL11H_INTMASK_DP) ? " dp" : "");
1404 }
1405
1406 static int proc_sl811h_show(struct seq_file *s, void *unused)
1407 {
1408         struct sl811            *sl811 = s->private;
1409         struct sl811h_ep        *ep;
1410         unsigned                i;
1411
1412         seq_printf(s, "%s\n%s version %s\nportstatus[1] = %08x\n",
1413                 sl811_to_hcd(sl811)->product_desc,
1414                 hcd_name, DRIVER_VERSION,
1415                 sl811->port1);
1416
1417         seq_printf(s, "insert/remove: %ld\n", sl811->stat_insrmv);
1418         seq_printf(s, "current session:  done_a %ld done_b %ld "
1419                         "wake %ld sof %ld overrun %ld lost %ld\n\n",
1420                 sl811->stat_a, sl811->stat_b,
1421                 sl811->stat_wake, sl811->stat_sof,
1422                 sl811->stat_overrun, sl811->stat_lost);
1423
1424         spin_lock_irq(&sl811->lock);
1425
1426         if (sl811->ctrl1 & SL11H_CTL1MASK_SUSPEND)
1427                 seq_printf(s, "(suspended)\n\n");
1428         else {
1429                 u8      t = sl811_read(sl811, SL11H_CTLREG1);
1430
1431                 seq_printf(s, "ctrl1 %02x%s%s%s%s\n", t,
1432                         (t & SL11H_CTL1MASK_SOF_ENA) ? " sofgen" : "",
1433                         ({char *s; switch (t & SL11H_CTL1MASK_FORCE) {
1434                         case SL11H_CTL1MASK_NORMAL: s = ""; break;
1435                         case SL11H_CTL1MASK_SE0: s = " se0/reset"; break;
1436                         case SL11H_CTL1MASK_K: s = " k/resume"; break;
1437                         default: s = "j"; break;
1438                         }; s; }),
1439                         (t & SL11H_CTL1MASK_LSPD) ? " lowspeed" : "",
1440                         (t & SL11H_CTL1MASK_SUSPEND) ? " suspend" : "");
1441
1442                 dump_irq(s, "irq_enable",
1443                                 sl811_read(sl811, SL11H_IRQ_ENABLE));
1444                 dump_irq(s, "irq_status",
1445                                 sl811_read(sl811, SL11H_IRQ_STATUS));
1446                 seq_printf(s, "frame clocks remaining:  %d\n",
1447                                 sl811_read(sl811, SL11H_SOFTMRREG) << 6);
1448         }
1449
1450         seq_printf(s, "A: qh%p ctl %02x sts %02x\n", sl811->active_a,
1451                 sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG)),
1452                 sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG)));
1453         seq_printf(s, "B: qh%p ctl %02x sts %02x\n", sl811->active_b,
1454                 sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG)),
1455                 sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG)));
1456         seq_printf(s, "\n");
1457         list_for_each_entry (ep, &sl811->async, schedule) {
1458                 struct urb              *urb;
1459
1460                 seq_printf(s, "%s%sqh%p, ep%d%s, maxpacket %d"
1461                                         " nak %d err %d\n",
1462                         (ep == sl811->active_a) ? "(A) " : "",
1463                         (ep == sl811->active_b) ? "(B) " : "",
1464                         ep, ep->epnum,
1465                         ({ char *s; switch (ep->nextpid) {
1466                         case USB_PID_IN: s = "in"; break;
1467                         case USB_PID_OUT: s = "out"; break;
1468                         case USB_PID_SETUP: s = "setup"; break;
1469                         case USB_PID_ACK: s = "status"; break;
1470                         default: s = "?"; break;
1471                         }; s;}),
1472                         ep->maxpacket,
1473                         ep->nak_count, ep->error_count);
1474                 list_for_each_entry (urb, &ep->hep->urb_list, urb_list) {
1475                         seq_printf(s, "  urb%p, %d/%d\n", urb,
1476                                 urb->actual_length,
1477                                 urb->transfer_buffer_length);
1478                 }
1479         }
1480         if (!list_empty(&sl811->async))
1481                 seq_printf(s, "\n");
1482
1483         seq_printf(s, "periodic size= %d\n", PERIODIC_SIZE);
1484
1485         for (i = 0; i < PERIODIC_SIZE; i++) {
1486                 ep = sl811->periodic[i];
1487                 if (!ep)
1488                         continue;
1489                 seq_printf(s, "%2d [%3d]:\n", i, sl811->load[i]);
1490
1491                 /* DUMB: prints shared entries multiple times */
1492                 do {
1493                         seq_printf(s,
1494                                 "   %s%sqh%d/%p (%sdev%d ep%d%s max %d) "
1495                                         "err %d\n",
1496                                 (ep == sl811->active_a) ? "(A) " : "",
1497                                 (ep == sl811->active_b) ? "(B) " : "",
1498                                 ep->period, ep,
1499                                 (ep->udev->speed == USB_SPEED_FULL)
1500                                         ? "" : "ls ",
1501                                 ep->udev->devnum, ep->epnum,
1502                                 (ep->epnum == 0) ? ""
1503                                         : ((ep->nextpid == USB_PID_IN)
1504                                                 ? "in"
1505                                                 : "out"),
1506                                 ep->maxpacket, ep->error_count);
1507                         ep = ep->next;
1508                 } while (ep);
1509         }
1510
1511         spin_unlock_irq(&sl811->lock);
1512         seq_printf(s, "\n");
1513
1514         return 0;
1515 }
1516
1517 static int proc_sl811h_open(struct inode *inode, struct file *file)
1518 {
1519         return single_open(file, proc_sl811h_show, PDE(inode)->data);
1520 }
1521
1522 static struct file_operations proc_ops = {
1523         .open           = proc_sl811h_open,
1524         .read           = seq_read,
1525         .llseek         = seq_lseek,
1526         .release        = single_release,
1527 };
1528
1529 /* expect just one sl811 per system */
1530 static const char proc_filename[] = "driver/sl811h";
1531
1532 static void create_debug_file(struct sl811 *sl811)
1533 {
1534         struct proc_dir_entry *pde;
1535
1536         pde = create_proc_entry(proc_filename, 0, NULL);
1537         if (pde == NULL)
1538                 return;
1539
1540         pde->proc_fops = &proc_ops;
1541         pde->data = sl811;
1542         sl811->pde = pde;
1543 }
1544
1545 static void remove_debug_file(struct sl811 *sl811)
1546 {
1547         if (sl811->pde)
1548                 remove_proc_entry(proc_filename, NULL);
1549 }
1550
1551 #endif
1552
1553 /*-------------------------------------------------------------------------*/
1554
1555 static void
1556 sl811h_stop(struct usb_hcd *hcd)
1557 {
1558         struct sl811    *sl811 = hcd_to_sl811(hcd);
1559         unsigned long   flags;
1560
1561         del_timer_sync(&hcd->rh_timer);
1562
1563         spin_lock_irqsave(&sl811->lock, flags);
1564         port_power(sl811, 0);
1565         spin_unlock_irqrestore(&sl811->lock, flags);
1566 }
1567
1568 static int
1569 sl811h_start(struct usb_hcd *hcd)
1570 {
1571         struct sl811            *sl811 = hcd_to_sl811(hcd);
1572
1573         /* chip has been reset, VBUS power is off */
1574         hcd->state = HC_STATE_RUNNING;
1575
1576         if (sl811->board) {
1577                 if (!device_can_wakeup(hcd->self.controller))
1578                         device_init_wakeup(hcd->self.controller,
1579                                 sl811->board->can_wakeup);
1580                 hcd->power_budget = sl811->board->power * 2;
1581         }
1582
1583         /* enable power and interupts */
1584         port_power(sl811, 1);
1585
1586         return 0;
1587 }
1588
1589 /*-------------------------------------------------------------------------*/
1590
1591 static struct hc_driver sl811h_hc_driver = {
1592         .description =          hcd_name,
1593         .hcd_priv_size =        sizeof(struct sl811),
1594
1595         /*
1596          * generic hardware linkage
1597          */
1598         .irq =                  sl811h_irq,
1599         .flags =                HCD_USB11 | HCD_MEMORY,
1600
1601         /* Basic lifecycle operations */
1602         .start =                sl811h_start,
1603         .stop =                 sl811h_stop,
1604
1605         /*
1606          * managing i/o requests and associated device resources
1607          */
1608         .urb_enqueue =          sl811h_urb_enqueue,
1609         .urb_dequeue =          sl811h_urb_dequeue,
1610         .endpoint_disable =     sl811h_endpoint_disable,
1611
1612         /*
1613          * periodic schedule support
1614          */
1615         .get_frame_number =     sl811h_get_frame,
1616
1617         /*
1618          * root hub support
1619          */
1620         .hub_status_data =      sl811h_hub_status_data,
1621         .hub_control =          sl811h_hub_control,
1622         .bus_suspend =          sl811h_bus_suspend,
1623         .bus_resume =           sl811h_bus_resume,
1624 };
1625
1626 /*-------------------------------------------------------------------------*/
1627
1628 static int __devexit
1629 sl811h_remove(struct platform_device *dev)
1630 {
1631         struct usb_hcd          *hcd = platform_get_drvdata(dev);
1632         struct sl811            *sl811 = hcd_to_sl811(hcd);
1633         struct resource         *res;
1634
1635         remove_debug_file(sl811);
1636         usb_remove_hcd(hcd);
1637
1638         /* some platforms may use IORESOURCE_IO */
1639         res = platform_get_resource(dev, IORESOURCE_MEM, 1);
1640         if (res)
1641                 iounmap(sl811->data_reg);
1642
1643         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1644         if (res)
1645                 iounmap(sl811->addr_reg);
1646
1647         usb_put_hcd(hcd);
1648         return 0;
1649 }
1650
1651 static int __devinit
1652 sl811h_probe(struct platform_device *dev)
1653 {
1654         struct usb_hcd          *hcd;
1655         struct sl811            *sl811;
1656         struct resource         *addr, *data;
1657         int                     irq;
1658         void __iomem            *addr_reg;
1659         void __iomem            *data_reg;
1660         int                     retval;
1661         u8                      tmp, ioaddr = 0;
1662
1663         /* basic sanity checks first.  board-specific init logic should
1664          * have initialized these three resources and probably board
1665          * specific platform_data.  we don't probe for IRQs, and do only
1666          * minimal sanity checking.
1667          */
1668         irq = platform_get_irq(dev, 0);
1669         if (dev->num_resources < 3 || irq < 0)
1670                 return -ENODEV;
1671
1672         /* refuse to confuse usbcore */
1673         if (dev->dev.dma_mask) {
1674                 DBG("no we won't dma\n");
1675                 return -EINVAL;
1676         }
1677
1678         /* the chip may be wired for either kind of addressing */
1679         addr = platform_get_resource(dev, IORESOURCE_MEM, 0);
1680         data = platform_get_resource(dev, IORESOURCE_MEM, 1);
1681         retval = -EBUSY;
1682         if (!addr || !data) {
1683                 addr = platform_get_resource(dev, IORESOURCE_IO, 0);
1684                 data = platform_get_resource(dev, IORESOURCE_IO, 1);
1685                 if (!addr || !data)
1686                         return -ENODEV;
1687                 ioaddr = 1;
1688
1689                 addr_reg = (void __iomem *) addr->start;
1690                 data_reg = (void __iomem *) data->start;
1691         } else {
1692                 addr_reg = ioremap(addr->start, 1);
1693                 if (addr_reg == NULL) {
1694                         retval = -ENOMEM;
1695                         goto err2;
1696                 }
1697
1698                 data_reg = ioremap(data->start, 1);
1699                 if (data_reg == NULL) {
1700                         retval = -ENOMEM;
1701                         goto err4;
1702                 }
1703         }
1704
1705         /* allocate and initialize hcd */
1706         hcd = usb_create_hcd(&sl811h_hc_driver, &dev->dev, dev->dev.bus_id);
1707         if (!hcd) {
1708                 retval = -ENOMEM;
1709                 goto err5;
1710         }
1711         hcd->rsrc_start = addr->start;
1712         sl811 = hcd_to_sl811(hcd);
1713
1714         spin_lock_init(&sl811->lock);
1715         INIT_LIST_HEAD(&sl811->async);
1716         sl811->board = dev->dev.platform_data;
1717         init_timer(&sl811->timer);
1718         sl811->timer.function = sl811h_timer;
1719         sl811->timer.data = (unsigned long) sl811;
1720         sl811->addr_reg = addr_reg;
1721         sl811->data_reg = data_reg;
1722
1723         spin_lock_irq(&sl811->lock);
1724         port_power(sl811, 0);
1725         spin_unlock_irq(&sl811->lock);
1726         msleep(200);
1727
1728         tmp = sl811_read(sl811, SL11H_HWREVREG);
1729         switch (tmp >> 4) {
1730         case 1:
1731                 hcd->product_desc = "SL811HS v1.2";
1732                 break;
1733         case 2:
1734                 hcd->product_desc = "SL811HS v1.5";
1735                 break;
1736         default:
1737                 /* reject case 0, SL11S is less functional */
1738                 DBG("chiprev %02x\n", tmp);
1739                 retval = -ENXIO;
1740                 goto err6;
1741         }
1742
1743         /* The chip's IRQ is level triggered, active high.  A requirement
1744          * for platform device setup is to cope with things like signal
1745          * inverters (e.g. CF is active low) or working only with edge
1746          * triggers (e.g. most ARM CPUs).  Initial driver stress testing
1747          * was on a system with single edge triggering, so most sorts of
1748          * triggering arrangement should work.
1749          */
1750         retval = usb_add_hcd(hcd, irq, SA_INTERRUPT | SA_SHIRQ);
1751         if (retval != 0)
1752                 goto err6;
1753
1754         create_debug_file(sl811);
1755         return retval;
1756
1757  err6:
1758         usb_put_hcd(hcd);
1759  err5:
1760         if (!ioaddr)
1761                 iounmap(data_reg);
1762  err4:
1763         if (!ioaddr)
1764                 iounmap(addr_reg);
1765  err2:
1766         DBG("init error, %d\n", retval);
1767         return retval;
1768 }
1769
1770 #ifdef  CONFIG_PM
1771
1772 /* for this device there's no useful distinction between the controller
1773  * and its root hub, except that the root hub only gets direct PM calls
1774  * when CONFIG_USB_SUSPEND is enabled.
1775  */
1776
1777 static int
1778 sl811h_suspend(struct platform_device *dev, pm_message_t state)
1779 {
1780         struct usb_hcd  *hcd = platform_get_drvdata(dev);
1781         struct sl811    *sl811 = hcd_to_sl811(hcd);
1782         int             retval = 0;
1783
1784         if (state.event == PM_EVENT_FREEZE)
1785                 retval = sl811h_bus_suspend(hcd);
1786         else if (state.event == PM_EVENT_SUSPEND)
1787                 port_power(sl811, 0);
1788         if (retval == 0)
1789                 dev->dev.power.power_state = state;
1790         return retval;
1791 }
1792
1793 static int
1794 sl811h_resume(struct platform_device *dev)
1795 {
1796         struct usb_hcd  *hcd = platform_get_drvdata(dev);
1797         struct sl811    *sl811 = hcd_to_sl811(hcd);
1798
1799         /* with no "check to see if VBUS is still powered" board hook,
1800          * let's assume it'd only be powered to enable remote wakeup.
1801          */
1802         if (dev->dev.power.power_state.event == PM_EVENT_SUSPEND
1803                         || !device_can_wakeup(&hcd->self.root_hub->dev)) {
1804                 sl811->port1 = 0;
1805                 port_power(sl811, 1);
1806                 usb_root_hub_lost_power(hcd->self.root_hub);
1807                 return 0;
1808         }
1809
1810         dev->dev.power.power_state = PMSG_ON;
1811         return sl811h_bus_resume(hcd);
1812 }
1813
1814 #else
1815
1816 #define sl811h_suspend  NULL
1817 #define sl811h_resume   NULL
1818
1819 #endif
1820
1821
1822 /* this driver is exported so sl811_cs can depend on it */
1823 struct platform_driver sl811h_driver = {
1824         .probe =        sl811h_probe,
1825         .remove =       __devexit_p(sl811h_remove),
1826
1827         .suspend =      sl811h_suspend,
1828         .resume =       sl811h_resume,
1829         .driver = {
1830                 .name = (char *) hcd_name,
1831                 .owner = THIS_MODULE,
1832         },
1833 };
1834 EXPORT_SYMBOL(sl811h_driver);
1835
1836 /*-------------------------------------------------------------------------*/
1837
1838 static int __init sl811h_init(void)
1839 {
1840         if (usb_disabled())
1841                 return -ENODEV;
1842
1843         INFO("driver %s, %s\n", hcd_name, DRIVER_VERSION);
1844         return platform_driver_register(&sl811h_driver);
1845 }
1846 module_init(sl811h_init);
1847
1848 static void __exit sl811h_cleanup(void)
1849 {
1850         platform_driver_unregister(&sl811h_driver);
1851 }
1852 module_exit(sl811h_cleanup);