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