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