hw/usb-uhci.c

   1 /*
   2  * USB UHCI controller emulation
   3  *
   4  * Copyright (c) 2005 Fabrice Bellard
   5  *
   6  * Copyright (c) 2008 Max Krasnyansky
   7  *     Magor rewrite of the UHCI data structures parser and frame processor
   8  *     Support for fully async operation and multiple outstanding transactions
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to deal
  12  * in the Software without restriction, including without limitation the rights
  13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14  * copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  23  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  26  * THE SOFTWARE.
  27  */
  28 #include "hw.h"
  29 #include "usb.h"
  30 #include "pci.h"
  31 #include "qemu-timer.h"
  32 #include "usb-uhci.h"
  33
  34 //#define DEBUG
  35 //#define DEBUG_DUMP_DATA
  36
  37 #define UHCI_CMD_FGR      (1 << 4)
  38 #define UHCI_CMD_EGSM     (1 << 3)
  39 #define UHCI_CMD_GRESET   (1 << 2)
  40 #define UHCI_CMD_HCRESET  (1 << 1)
  41 #define UHCI_CMD_RS       (1 << 0)
  42
  43 #define UHCI_STS_HCHALTED (1 << 5)
  44 #define UHCI_STS_HCPERR   (1 << 4)
  45 #define UHCI_STS_HSERR    (1 << 3)
  46 #define UHCI_STS_RD       (1 << 2)
  47 #define UHCI_STS_USBERR   (1 << 1)
  48 #define UHCI_STS_USBINT   (1 << 0)
  49
  50 #define TD_CTRL_SPD     (1 << 29)
  51 #define TD_CTRL_ERROR_SHIFT  27
  52 #define TD_CTRL_IOS     (1 << 25)
  53 #define TD_CTRL_IOC     (1 << 24)
  54 #define TD_CTRL_ACTIVE  (1 << 23)
  55 #define TD_CTRL_STALL   (1 << 22)
  56 #define TD_CTRL_BABBLE  (1 << 20)
  57 #define TD_CTRL_NAK     (1 << 19)
  58 #define TD_CTRL_TIMEOUT (1 << 18)
  59
  60 #define UHCI_PORT_RESET (1 << 9)
  61 #define UHCI_PORT_LSDA  (1 << 8)
  62 #define UHCI_PORT_ENC   (1 << 3)
  63 #define UHCI_PORT_EN    (1 << 2)
  64 #define UHCI_PORT_CSC   (1 << 1)
  65 #define UHCI_PORT_CCS   (1 << 0)
  66
  67 #define FRAME_TIMER_FREQ 1000
  68
  69 #define FRAME_MAX_LOOPS  100
  70
  71 #define NB_PORTS 2
  72
  73 #ifdef DEBUG
  74 #define dprintf printf
  75
  76 static const char *pid2str(int pid)
  77 {
  78     switch (pid) {
  79     case USB_TOKEN_SETUP: return "SETUP";
  80     case USB_TOKEN_IN:    return "IN";
  81     case USB_TOKEN_OUT:   return "OUT";
  82     }
  83     return "?";
  84 }
  85
  86 #else
  87 #define dprintf(...)
  88 #endif
  89
  90 #ifdef DEBUG_DUMP_DATA
  91 static void dump_data(const uint8_t *data, int len)
  92 {
  93     int i;
  94
  95     printf("uhci: data: ");
  96     for(i = 0; i < len; i++)
  97         printf(" %02x", data[i]);
  98     printf("\n");
  99 }
 100 #else
 101 static void dump_data(const uint8_t *data, int len) {}
 102 #endif
 103
 104 /*
 105  * Pending async transaction.
 106  * 'packet' must be the first field because completion
 107  * handler does "(UHCIAsync *) pkt" cast.
 108  */
 109 typedef struct UHCIAsync {
 110     USBPacket packet;
 111     struct UHCIAsync *next;
 112     uint32_t  td;
 113     uint32_t  token;
 114     int8_t    valid;
 115     uint8_t   done;
 116     uint8_t   buffer[2048];
 117 } UHCIAsync;
 118
 119 typedef struct UHCIPort {
 120     USBPort port;
 121     uint16_t ctrl;
 122 } UHCIPort;
 123
 124 typedef struct UHCIState {
 125     PCIDevice dev;
 126     USBBus bus;
 127     uint16_t cmd; /* cmd register */
 128     uint16_t status;
 129     uint16_t intr; /* interrupt enable register */
 130     uint16_t frnum; /* frame number */
 131     uint32_t fl_base_addr; /* frame list base address */
 132     uint8_t sof_timing;
 133     uint8_t status2; /* bit 0 and 1 are used to generate UHCI_STS_USBINT */
 134     QEMUTimer *frame_timer;
 135     UHCIPort ports[NB_PORTS];
 136
 137     /* Interrupts that should be raised at the end of the current frame.  */
 138     uint32_t pending_int_mask;
 139
 140     /* Active packets */
 141     UHCIAsync *async_pending;
 142     UHCIAsync *async_pool;
 143     uint8_t num_ports_vmstate;
 144 } UHCIState;
 145
 146 typedef struct UHCI_TD {
 147     uint32_t link;
 148     uint32_t ctrl; /* see TD_CTRL_xxx */
 149     uint32_t token;
 150     uint32_t buffer;
 151 } UHCI_TD;
 152
 153 typedef struct UHCI_QH {
 154     uint32_t link;
 155     uint32_t el_link;
 156 } UHCI_QH;
 157
 158 static UHCIAsync *uhci_async_alloc(UHCIState *s)
 159 {
 160     UHCIAsync *async = qemu_malloc(sizeof(UHCIAsync));
 161
 162     memset(&async->packet, 0, sizeof(async->packet));
 163     async->valid = 0;
 164     async->td    = 0;
 165     async->token = 0;
 166     async->done  = 0;
 167     async->next  = NULL;
 168
 169     return async;
 170 }
 171
 172 static void uhci_async_free(UHCIState *s, UHCIAsync *async)
 173 {
 174     qemu_free(async);
 175 }
 176
 177 static void uhci_async_link(UHCIState *s, UHCIAsync *async)
 178 {
 179     async->next = s->async_pending;
 180     s->async_pending = async;
 181 }
 182
 183 static void uhci_async_unlink(UHCIState *s, UHCIAsync *async)
 184 {
 185     UHCIAsync *curr = s->async_pending;
 186     UHCIAsync **prev = &s->async_pending;
 187
 188     while (curr) {
 189         if (curr == async) {
 190             *prev = curr->next;
 191             return;
 192         }
 193
 194         prev = &curr->next;
 195         curr = curr->next;
 196     }
 197 }
 198
 199 static void uhci_async_cancel(UHCIState *s, UHCIAsync *async)
 200 {
 201     dprintf("uhci: cancel td 0x%x token 0x%x done %u\n",
 202            async->td, async->token, async->done);
 203
 204     if (!async->done)
 205         usb_cancel_packet(&async->packet);
 206     uhci_async_free(s, async);
 207 }
 208
 209 /*
 210  * Mark all outstanding async packets as invalid.
 211  * This is used for canceling them when TDs are removed by the HCD.
 212  */
 213 static UHCIAsync *uhci_async_validate_begin(UHCIState *s)
 214 {
 215     UHCIAsync *async = s->async_pending;
 216
 217     while (async) {
 218         async->valid--;
 219         async = async->next;
 220     }
 221     return NULL;
 222 }
 223
 224 /*
 225  * Cancel async packets that are no longer valid
 226  */
 227 static void uhci_async_validate_end(UHCIState *s)
 228 {
 229     UHCIAsync *curr = s->async_pending;
 230     UHCIAsync **prev = &s->async_pending;
 231     UHCIAsync *next;
 232
 233     while (curr) {
 234         if (curr->valid > 0) {
 235             prev = &curr->next;
 236             curr = curr->next;
 237             continue;
 238         }
 239
 240         next = curr->next;
 241
 242         /* Unlink */
 243         *prev = next;
 244
 245         uhci_async_cancel(s, curr);
 246
 247         curr = next;
 248     }
 249 }
 250
 251 static void uhci_async_cancel_all(UHCIState *s)
 252 {
 253     UHCIAsync *curr = s->async_pending;
 254     UHCIAsync *next;
 255
 256     while (curr) {
 257         next = curr->next;
 258
 259         uhci_async_cancel(s, curr);
 260
 261         curr = next;
 262     }
 263
 264     s->async_pending = NULL;
 265 }
 266
 267 static UHCIAsync *uhci_async_find_td(UHCIState *s, uint32_t addr, uint32_t token)
 268 {
 269     UHCIAsync *async = s->async_pending;
 270     UHCIAsync *match = NULL;
 271     int count = 0;
 272
 273     /*
 274      * We're looking for the best match here. ie both td addr and token.
 275      * Otherwise we return last good match. ie just token.
 276      * It's ok to match just token because it identifies the transaction
 277      * rather well, token includes: device addr, endpoint, size, etc.
 278      *
 279      * Also since we queue async transactions in reverse order by returning
 280      * last good match we restores the order.
 281      *
 282      * It's expected that we wont have a ton of outstanding transactions.
 283      * If we ever do we'd want to optimize this algorithm.
 284      */
 285
 286     while (async) {
 287         if (async->token == token) {
 288             /* Good match */
 289             match = async;
 290
 291             if (async->td == addr) {
 292                 /* Best match */
 293                 break;
 294             }
 295         }
 296
 297         async = async->next;
 298         count++;
 299     }
 300
 301     if (count > 64)
 302         fprintf(stderr, "uhci: warning lots of async transactions\n");
 303
 304     return match;
 305 }
 306
 307 static void uhci_attach(USBPort *port1, USBDevice *dev);
 308
 309 static void uhci_update_irq(UHCIState *s)
 310 {
 311     int level;
 312     if (((s->status2 & 1) && (s->intr & (1 << 2))) ||
 313         ((s->status2 & 2) && (s->intr & (1 << 3))) ||
 314         ((s->status & UHCI_STS_USBERR) && (s->intr & (1 << 0))) ||
 315         ((s->status & UHCI_STS_RD) && (s->intr & (1 << 1))) ||
 316         (s->status & UHCI_STS_HSERR) ||
 317         (s->status & UHCI_STS_HCPERR)) {
 318         level = 1;
 319     } else {
 320         level = 0;
 321     }
 322     qemu_set_irq(s->dev.irq[3], level);
 323 }
 324
 325 static void uhci_reset(void *opaque)
 326 {
 327     UHCIState *s = opaque;
 328     uint8_t *pci_conf;
 329     int i;
 330     UHCIPort *port;
 331
 332     dprintf("uhci: full reset\n");
 333
 334     pci_conf = s->dev.config;
 335
 336     pci_conf[0x6a] = 0x01; /* usb clock */
 337     pci_conf[0x6b] = 0x00;
 338     s->cmd = 0;
 339     s->status = 0;
 340     s->status2 = 0;
 341     s->intr = 0;
 342     s->fl_base_addr = 0;
 343     s->sof_timing = 64;
 344
 345     for(i = 0; i < NB_PORTS; i++) {
 346         port = &s->ports[i];
 347         port->ctrl = 0x0080;
 348         if (port->port.dev)
 349             uhci_attach(&port->port, port->port.dev);
 350     }
 351
 352     uhci_async_cancel_all(s);
 353 }
 354
 355 static void uhci_pre_save(void *opaque)
 356 {
 357     UHCIState *s = opaque;
 358
 359     uhci_async_cancel_all(s);
 360 }
 361
 362 static const VMStateDescription vmstate_uhci_port = {
 363     .name = "uhci port",
 364     .version_id = 1,
 365     .minimum_version_id = 1,
 366     .minimum_version_id_old = 1,
 367     .fields      = (VMStateField []) {
 368         VMSTATE_UINT16(ctrl, UHCIPort),
 369         VMSTATE_END_OF_LIST()
 370     }
 371 };
 372
 373 static const VMStateDescription vmstate_uhci = {
 374     .name = "uhci",
 375     .version_id = 1,
 376     .minimum_version_id = 1,
 377     .minimum_version_id_old = 1,
 378     .pre_save = uhci_pre_save,
 379     .fields      = (VMStateField []) {
 380         VMSTATE_PCI_DEVICE(dev, UHCIState),
 381         VMSTATE_UINT8_EQUAL(num_ports_vmstate, UHCIState),
 382         VMSTATE_STRUCT_ARRAY(ports, UHCIState, NB_PORTS, 1,
 383                              vmstate_uhci_port, UHCIPort),
 384         VMSTATE_UINT16(cmd, UHCIState),
 385         VMSTATE_UINT16(status, UHCIState),
 386         VMSTATE_UINT16(intr, UHCIState),
 387         VMSTATE_UINT16(frnum, UHCIState),
 388         VMSTATE_UINT32(fl_base_addr, UHCIState),
 389         VMSTATE_UINT8(sof_timing, UHCIState),
 390         VMSTATE_UINT8(status2, UHCIState),
 391         VMSTATE_TIMER(frame_timer, UHCIState),
 392         VMSTATE_END_OF_LIST()
 393     }
 394 };
 395
 396 static void uhci_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)
 397 {
 398     UHCIState *s = opaque;
 399
 400     addr &= 0x1f;
 401     switch(addr) {
 402     case 0x0c:
 403         s->sof_timing = val;
 404         break;
 405     }
 406 }
 407
 408 static uint32_t uhci_ioport_readb(void *opaque, uint32_t addr)
 409 {
 410     UHCIState *s = opaque;
 411     uint32_t val;
 412
 413     addr &= 0x1f;
 414     switch(addr) {
 415     case 0x0c:
 416         val = s->sof_timing;
 417         break;
 418     default:
 419         val = 0xff;
 420         break;
 421     }
 422     return val;
 423 }
 424
 425 static void uhci_ioport_writew(void *opaque, uint32_t addr, uint32_t val)
 426 {
 427     UHCIState *s = opaque;
 428
 429     addr &= 0x1f;
 430     dprintf("uhci: writew port=0x%04x val=0x%04x\n", addr, val);
 431
 432     switch(addr) {
 433     case 0x00:
 434         if ((val & UHCI_CMD_RS) && !(s->cmd & UHCI_CMD_RS)) {
 435             /* start frame processing */
 436             qemu_mod_timer(s->frame_timer, qemu_get_clock(vm_clock));
 437             s->status &= ~UHCI_STS_HCHALTED;
 438         } else if (!(val & UHCI_CMD_RS)) {
 439             s->status |= UHCI_STS_HCHALTED;
 440         }
 441         if (val & UHCI_CMD_GRESET) {
 442             UHCIPort *port;
 443             USBDevice *dev;
 444             int i;
 445
 446             /* send reset on the USB bus */
 447             for(i = 0; i < NB_PORTS; i++) {
 448                 port = &s->ports[i];
 449                 dev = port->port.dev;
 450                 if (dev) {
 451                     usb_send_msg(dev, USB_MSG_RESET);
 452                 }
 453             }
 454             uhci_reset(s);
 455             return;
 456         }
 457         if (val & UHCI_CMD_HCRESET) {
 458             uhci_reset(s);
 459             return;
 460         }
 461         s->cmd = val;
 462         break;
 463     case 0x02:
 464         s->status &= ~val;
 465         /* XXX: the chip spec is not coherent, so we add a hidden
 466            register to distinguish between IOC and SPD */
 467         if (val & UHCI_STS_USBINT)
 468             s->status2 = 0;
 469         uhci_update_irq(s);
 470         break;
 471     case 0x04:
 472         s->intr = val;
 473         uhci_update_irq(s);
 474         break;
 475     case 0x06:
 476         if (s->status & UHCI_STS_HCHALTED)
 477             s->frnum = val & 0x7ff;
 478         break;
 479     case 0x10 ... 0x1f:
 480         {
 481             UHCIPort *port;
 482             USBDevice *dev;
 483             int n;
 484
 485             n = (addr >> 1) & 7;
 486             if (n >= NB_PORTS)
 487                 return;
 488             port = &s->ports[n];
 489             dev = port->port.dev;
 490             if (dev) {
 491                 /* port reset */
 492                 if ( (val & UHCI_PORT_RESET) &&
 493                      !(port->ctrl & UHCI_PORT_RESET) ) {
 494                     usb_send_msg(dev, USB_MSG_RESET);
 495                 }
 496             }
 497             port->ctrl = (port->ctrl & 0x01fb) | (val & ~0x01fb);
 498             /* some bits are reset when a '1' is written to them */
 499             port->ctrl &= ~(val & 0x000a);
 500         }
 501         break;
 502     }
 503 }
 504
 505 static uint32_t uhci_ioport_readw(void *opaque, uint32_t addr)
 506 {
 507     UHCIState *s = opaque;
 508     uint32_t val;
 509
 510     addr &= 0x1f;
 511     switch(addr) {
 512     case 0x00:
 513         val = s->cmd;
 514         break;
 515     case 0x02:
 516         val = s->status;
 517         break;
 518     case 0x04:
 519         val = s->intr;
 520         break;
 521     case 0x06:
 522         val = s->frnum;
 523         break;
 524     case 0x10 ... 0x1f:
 525         {
 526             UHCIPort *port;
 527             int n;
 528             n = (addr >> 1) & 7;
 529             if (n >= NB_PORTS)
 530                 goto read_default;
 531             port = &s->ports[n];
 532             val = port->ctrl;
 533         }
 534         break;
 535     default:
 536     read_default:
 537         val = 0xff7f; /* disabled port */
 538         break;
 539     }
 540
 541     dprintf("uhci: readw port=0x%04x val=0x%04x\n", addr, val);
 542
 543     return val;
 544 }
 545
 546 static void uhci_ioport_writel(void *opaque, uint32_t addr, uint32_t val)
 547 {
 548     UHCIState *s = opaque;
 549
 550     addr &= 0x1f;
 551     dprintf("uhci: writel port=0x%04x val=0x%08x\n", addr, val);
 552
 553     switch(addr) {
 554     case 0x08:
 555         s->fl_base_addr = val & ~0xfff;
 556         break;
 557     }
 558 }
 559
 560 static uint32_t uhci_ioport_readl(void *opaque, uint32_t addr)
 561 {
 562     UHCIState *s = opaque;
 563     uint32_t val;
 564
 565     addr &= 0x1f;
 566     switch(addr) {
 567     case 0x08:
 568         val = s->fl_base_addr;
 569         break;
 570     default:
 571         val = 0xffffffff;
 572         break;
 573     }
 574     return val;
 575 }
 576
 577 /* signal resume if controller suspended */
 578 static void uhci_resume (void *opaque)
 579 {
 580     UHCIState *s = (UHCIState *)opaque;
 581
 582     if (!s)
 583         return;
 584
 585     if (s->cmd & UHCI_CMD_EGSM) {
 586         s->cmd |= UHCI_CMD_FGR;
 587         s->status |= UHCI_STS_RD;
 588         uhci_update_irq(s);
 589     }
 590 }
 591
 592 static void uhci_attach(USBPort *port1, USBDevice *dev)
 593 {
 594     UHCIState *s = port1->opaque;
 595     UHCIPort *port = &s->ports[port1->index];
 596
 597     if (dev) {
 598         if (port->port.dev) {
 599             usb_attach(port1, NULL);
 600         }
 601         /* set connect status */
 602         port->ctrl |= UHCI_PORT_CCS | UHCI_PORT_CSC;
 603
 604         /* update speed */
 605         if (dev->speed == USB_SPEED_LOW)
 606             port->ctrl |= UHCI_PORT_LSDA;
 607         else
 608             port->ctrl &= ~UHCI_PORT_LSDA;
 609
 610         uhci_resume(s);
 611
 612         port->port.dev = dev;
 613         /* send the attach message */
 614         usb_send_msg(dev, USB_MSG_ATTACH);
 615     } else {
 616         /* set connect status */
 617         if (port->ctrl & UHCI_PORT_CCS) {
 618             port->ctrl &= ~UHCI_PORT_CCS;
 619             port->ctrl |= UHCI_PORT_CSC;
 620         }
 621         /* disable port */
 622         if (port->ctrl & UHCI_PORT_EN) {
 623             port->ctrl &= ~UHCI_PORT_EN;
 624             port->ctrl |= UHCI_PORT_ENC;
 625         }
 626
 627         uhci_resume(s);
 628
 629         dev = port->port.dev;
 630         if (dev) {
 631             /* send the detach message */
 632             usb_send_msg(dev, USB_MSG_DETACH);
 633         }
 634         port->port.dev = NULL;
 635     }
 636 }
 637
 638 static int uhci_broadcast_packet(UHCIState *s, USBPacket *p)
 639 {
 640     int i, ret;
 641
 642     dprintf("uhci: packet enter. pid %s addr 0x%02x ep %d len %d\n",
 643            pid2str(p->pid), p->devaddr, p->devep, p->len);
 644     if (p->pid == USB_TOKEN_OUT || p->pid == USB_TOKEN_SETUP)
 645         dump_data(p->data, p->len);
 646
 647     ret = USB_RET_NODEV;
 648     for (i = 0; i < NB_PORTS && ret == USB_RET_NODEV; i++) {
 649         UHCIPort *port = &s->ports[i];
 650         USBDevice *dev = port->port.dev;
 651
 652         if (dev && (port->ctrl & UHCI_PORT_EN))
 653             ret = dev->info->handle_packet(dev, p);
 654     }
 655
 656     dprintf("uhci: packet exit. ret %d len %d\n", ret, p->len);
 657     if (p->pid == USB_TOKEN_IN && ret > 0)
 658         dump_data(p->data, ret);
 659
 660     return ret;
 661 }
 662
 663 static void uhci_async_complete(USBPacket * packet, void *opaque);
 664 static void uhci_process_frame(UHCIState *s);
 665
 666 /* return -1 if fatal error (frame must be stopped)
 667           0 if TD successful
 668           1 if TD unsuccessful or inactive
 669 */
 670 static int uhci_complete_td(UHCIState *s, UHCI_TD *td, UHCIAsync *async, uint32_t *int_mask)
 671 {
 672     int len = 0, max_len, err, ret;
 673     uint8_t pid;
 674
 675     max_len = ((td->token >> 21) + 1) & 0x7ff;
 676     pid = td->token & 0xff;
 677
 678     ret = async->packet.len;
 679
 680     if (td->ctrl & TD_CTRL_IOC)
 681         *int_mask |= 0x01;
 682
 683     if (td->ctrl & TD_CTRL_IOS)
 684         td->ctrl &= ~TD_CTRL_ACTIVE;
 685
 686     if (ret < 0)
 687         goto out;
 688
 689     len = async->packet.len;
 690     td->ctrl = (td->ctrl & ~0x7ff) | ((len - 1) & 0x7ff);
 691
 692     /* The NAK bit may have been set by a previous frame, so clear it
 693        here.  The docs are somewhat unclear, but win2k relies on this
 694        behavior.  */
 695     td->ctrl &= ~(TD_CTRL_ACTIVE | TD_CTRL_NAK);
 696
 697     if (pid == USB_TOKEN_IN) {
 698         if (len > max_len) {
 699             len = max_len;
 700             ret = USB_RET_BABBLE;
 701             goto out;
 702         }
 703
 704         if (len > 0) {
 705             /* write the data back */
 706             cpu_physical_memory_write(td->buffer, async->buffer, len);
 707         }
 708
 709         if ((td->ctrl & TD_CTRL_SPD) && len < max_len) {
 710             *int_mask |= 0x02;
 711             /* short packet: do not update QH */
 712             dprintf("uhci: short packet. td 0x%x token 0x%x\n", async->td, async->token);
 713             return 1;
 714         }
 715     }
 716
 717     /* success */
 718     return 0;
 719
 720 out:
 721     switch(ret) {
 722     case USB_RET_STALL:
 723         td->ctrl |= TD_CTRL_STALL;
 724         td->ctrl &= ~TD_CTRL_ACTIVE;
 725         return 1;
 726
 727     case USB_RET_BABBLE:
 728         td->ctrl |= TD_CTRL_BABBLE | TD_CTRL_STALL;
 729         td->ctrl &= ~TD_CTRL_ACTIVE;
 730         /* frame interrupted */
 731         return -1;
 732
 733     case USB_RET_NAK:
 734         td->ctrl |= TD_CTRL_NAK;
 735         if (pid == USB_TOKEN_SETUP)
 736             break;
 737         return 1;
 738
 739     case USB_RET_NODEV:
 740     default:
 741         break;
 742     }
 743
 744     /* Retry the TD if error count is not zero */
 745
 746     td->ctrl |= TD_CTRL_TIMEOUT;
 747     err = (td->ctrl >> TD_CTRL_ERROR_SHIFT) & 3;
 748     if (err != 0) {
 749         err--;
 750         if (err == 0) {
 751             td->ctrl &= ~TD_CTRL_ACTIVE;
 752             s->status |= UHCI_STS_USBERR;
 753             uhci_update_irq(s);
 754         }
 755     }
 756     td->ctrl = (td->ctrl & ~(3 << TD_CTRL_ERROR_SHIFT)) |
 757         (err << TD_CTRL_ERROR_SHIFT);
 758     return 1;
 759 }
 760
 761 static int uhci_handle_td(UHCIState *s, uint32_t addr, UHCI_TD *td, uint32_t *int_mask)
 762 {
 763     UHCIAsync *async;
 764     int len = 0, max_len;
 765     uint8_t pid;
 766
 767     /* Is active ? */
 768     if (!(td->ctrl & TD_CTRL_ACTIVE))
 769         return 1;
 770
 771     async = uhci_async_find_td(s, addr, td->token);
 772     if (async) {
 773         /* Already submitted */
 774         async->valid = 32;
 775
 776         if (!async->done)
 777             return 1;
 778
 779         uhci_async_unlink(s, async);
 780         goto done;
 781     }
 782
 783     /* Allocate new packet */
 784     async = uhci_async_alloc(s);
 785     if (!async)
 786         return 1;
 787
 788     async->valid = 10;
 789     async->td    = addr;
 790     async->token = td->token;
 791
 792     max_len = ((td->token >> 21) + 1) & 0x7ff;
 793     pid = td->token & 0xff;
 794
 795     async->packet.pid     = pid;
 796     async->packet.devaddr = (td->token >> 8) & 0x7f;
 797     async->packet.devep   = (td->token >> 15) & 0xf;
 798     async->packet.data    = async->buffer;
 799     async->packet.len     = max_len;
 800     async->packet.complete_cb     = uhci_async_complete;
 801     async->packet.complete_opaque = s;
 802
 803     switch(pid) {
 804     case USB_TOKEN_OUT:
 805     case USB_TOKEN_SETUP:
 806         cpu_physical_memory_read(td->buffer, async->buffer, max_len);
 807         len = uhci_broadcast_packet(s, &async->packet);
 808         if (len >= 0)
 809             len = max_len;
 810         break;
 811
 812     case USB_TOKEN_IN:
 813         len = uhci_broadcast_packet(s, &async->packet);
 814         break;
 815
 816     default:
 817         /* invalid pid : frame interrupted */
 818         uhci_async_free(s, async);
 819         s->status |= UHCI_STS_HCPERR;
 820         uhci_update_irq(s);
 821         return -1;
 822     }
 823
 824     if (len == USB_RET_ASYNC) {
 825         uhci_async_link(s, async);
 826         return 2;
 827     }
 828
 829     async->packet.len = len;
 830
 831 done:
 832     len = uhci_complete_td(s, td, async, int_mask);
 833     uhci_async_free(s, async);
 834     return len;
 835 }
 836
 837 static void uhci_async_complete(USBPacket *packet, void *opaque)
 838 {
 839     UHCIState *s = opaque;
 840     UHCIAsync *async = (UHCIAsync *) packet;
 841
 842     dprintf("uhci: async complete. td 0x%x token 0x%x\n", async->td, async->token);
 843
 844     async->done = 1;
 845
 846     uhci_process_frame(s);
 847 }
 848
 849 static int is_valid(uint32_t link)
 850 {
 851     return (link & 1) == 0;
 852 }
 853
 854 static int is_qh(uint32_t link)
 855 {
 856     return (link & 2) != 0;
 857 }
 858
 859 static int depth_first(uint32_t link)
 860 {
 861     return (link & 4) != 0;
 862 }
 863
 864 /* QH DB used for detecting QH loops */
 865 #define UHCI_MAX_QUEUES 128
 866 typedef struct {
 867     uint32_t addr[UHCI_MAX_QUEUES];
 868     int      count;
 869 } QhDb;
 870
 871 static void qhdb_reset(QhDb *db)
 872 {
 873     db->count = 0;
 874 }
 875
 876 /* Add QH to DB. Returns 1 if already present or DB is full. */
 877 static int qhdb_insert(QhDb *db, uint32_t addr)
 878 {
 879     int i;
 880     for (i = 0; i < db->count; i++)
 881         if (db->addr[i] == addr)
 882             return 1;
 883
 884     if (db->count >= UHCI_MAX_QUEUES)
 885         return 1;
 886
 887     db->addr[db->count++] = addr;
 888     return 0;
 889 }
 890
 891 static void uhci_process_frame(UHCIState *s)
 892 {
 893     uint32_t frame_addr, link, old_td_ctrl, val, int_mask;
 894     uint32_t curr_qh;
 895     int cnt, ret;
 896     UHCI_TD td;
 897     UHCI_QH qh;
 898     QhDb qhdb;
 899
 900     frame_addr = s->fl_base_addr + ((s->frnum & 0x3ff) << 2);
 901
 902     dprintf("uhci: processing frame %d addr 0x%x\n" , s->frnum, frame_addr);
 903
 904     cpu_physical_memory_read(frame_addr, (uint8_t *)&link, 4);
 905     le32_to_cpus(&link);
 906
 907     int_mask = 0;
 908     curr_qh  = 0;
 909
 910     qhdb_reset(&qhdb);
 911
 912     for (cnt = FRAME_MAX_LOOPS; is_valid(link) && cnt; cnt--) {
 913         if (is_qh(link)) {
 914             /* QH */
 915
 916             if (qhdb_insert(&qhdb, link)) {
 917                 /*
 918                  * We're going in circles. Which is not a bug because
 919                  * HCD is allowed to do that as part of the BW management.
 920                  * In our case though it makes no sense to spin here. Sync transations
 921                  * are already done, and async completion handler will re-process
 922                  * the frame when something is ready.
 923                  */
 924                 dprintf("uhci: detected loop. qh 0x%x\n", link);
 925                 break;
 926             }
 927
 928             cpu_physical_memory_read(link & ~0xf, (uint8_t *) &qh, sizeof(qh));
 929             le32_to_cpus(&qh.link);
 930             le32_to_cpus(&qh.el_link);
 931
 932             dprintf("uhci: QH 0x%x load. link 0x%x elink 0x%x\n",
 933                     link, qh.link, qh.el_link);
 934
 935             if (!is_valid(qh.el_link)) {
 936                 /* QH w/o elements */
 937                 curr_qh = 0;
 938                 link = qh.link;
 939             } else {
 940                 /* QH with elements */
 941                 curr_qh = link;
 942                 link = qh.el_link;
 943             }
 944             continue;
 945         }
 946
 947         /* TD */
 948         cpu_physical_memory_read(link & ~0xf, (uint8_t *) &td, sizeof(td));
 949         le32_to_cpus(&td.link);
 950         le32_to_cpus(&td.ctrl);
 951         le32_to_cpus(&td.token);
 952         le32_to_cpus(&td.buffer);
 953
 954         dprintf("uhci: TD 0x%x load. link 0x%x ctrl 0x%x token 0x%x qh 0x%x\n",
 955                 link, td.link, td.ctrl, td.token, curr_qh);
 956
 957         old_td_ctrl = td.ctrl;
 958         ret = uhci_handle_td(s, link, &td, &int_mask);
 959         if (old_td_ctrl != td.ctrl) {
 960             /* update the status bits of the TD */
 961             val = cpu_to_le32(td.ctrl);
 962             cpu_physical_memory_write((link & ~0xf) + 4,
 963                                       (const uint8_t *)&val, sizeof(val));
 964         }
 965
 966         if (ret < 0) {
 967             /* interrupted frame */
 968             break;
 969         }
 970
 971         if (ret == 2 || ret == 1) {
 972             dprintf("uhci: TD 0x%x %s. link 0x%x ctrl 0x%x token 0x%x qh 0x%x\n",
 973                     link, ret == 2 ? "pend" : "skip",
 974                     td.link, td.ctrl, td.token, curr_qh);
 975
 976             link = curr_qh ? qh.link : td.link;
 977             continue;
 978         }
 979
 980         /* completed TD */
 981
 982         dprintf("uhci: TD 0x%x done. link 0x%x ctrl 0x%x token 0x%x qh 0x%x\n",
 983                 link, td.link, td.ctrl, td.token, curr_qh);
 984
 985         link = td.link;
 986
 987         if (curr_qh) {
 988             /* update QH element link */
 989             qh.el_link = link;
 990             val = cpu_to_le32(qh.el_link);
 991             cpu_physical_memory_write((curr_qh & ~0xf) + 4,
 992                                           (const uint8_t *)&val, sizeof(val));
 993
 994             if (!depth_first(link)) {
 995                /* done with this QH */
 996
 997                dprintf("uhci: QH 0x%x done. link 0x%x elink 0x%x\n",
 998                        curr_qh, qh.link, qh.el_link);
 999
1000                curr_qh = 0;
1001                link    = qh.link;
1002             }
1003         }
1004
1005         /* go to the next entry */
1006     }
1007
1008     s->pending_int_mask = int_mask;
1009 }
1010
1011 static void uhci_frame_timer(void *opaque)
1012 {
1013     UHCIState *s = opaque;
1014     int64_t expire_time;
1015
1016     if (!(s->cmd & UHCI_CMD_RS)) {
1017         /* Full stop */
1018         qemu_del_timer(s->frame_timer);
1019         /* set hchalted bit in status - UHCI11D 2.1.2 */
1020         s->status |= UHCI_STS_HCHALTED;
1021
1022         dprintf("uhci: halted\n");
1023         return;
1024     }
1025
1026     /* Complete the previous frame */
1027     if (s->pending_int_mask) {
1028         s->status2 |= s->pending_int_mask;
1029         s->status  |= UHCI_STS_USBINT;
1030         uhci_update_irq(s);
1031     }
1032
1033     /* Start new frame */
1034     s->frnum = (s->frnum + 1) & 0x7ff;
1035
1036     dprintf("uhci: new frame #%u\n" , s->frnum);
1037
1038     uhci_async_validate_begin(s);
1039
1040     uhci_process_frame(s);
1041
1042     uhci_async_validate_end(s);
1043
1044     /* prepare the timer for the next frame */
1045     expire_time = qemu_get_clock(vm_clock) +
1046         (get_ticks_per_sec() / FRAME_TIMER_FREQ);
1047     qemu_mod_timer(s->frame_timer, expire_time);
1048 }
1049
1050 static void uhci_map(PCIDevice *pci_dev, int region_num,
1051                     pcibus_t addr, pcibus_t size, int type)
1052 {
1053     UHCIState *s = (UHCIState *)pci_dev;
1054
1055     register_ioport_write(addr, 32, 2, uhci_ioport_writew, s);
1056     register_ioport_read(addr, 32, 2, uhci_ioport_readw, s);
1057     register_ioport_write(addr, 32, 4, uhci_ioport_writel, s);
1058     register_ioport_read(addr, 32, 4, uhci_ioport_readl, s);
1059     register_ioport_write(addr, 32, 1, uhci_ioport_writeb, s);
1060     register_ioport_read(addr, 32, 1, uhci_ioport_readb, s);
1061 }
1062
1063 static int usb_uhci_common_initfn(UHCIState *s)
1064 {
1065     uint8_t *pci_conf = s->dev.config;
1066     int i;
1067
1068     pci_conf[0x08] = 0x01; // revision number
1069     pci_conf[0x09] = 0x00;
1070     pci_config_set_class(pci_conf, PCI_CLASS_SERIAL_USB);
1071     pci_conf[PCI_HEADER_TYPE] = PCI_HEADER_TYPE_NORMAL; // header_type
1072     pci_conf[0x3d] = 4; // interrupt pin 3
1073     pci_conf[0x60] = 0x10; // release number
1074
1075     usb_bus_new(&s->bus, &s->dev.qdev);
1076     for(i = 0; i < NB_PORTS; i++) {
1077         usb_register_port(&s->bus, &s->ports[i].port, s, i, uhci_attach);
1078     }
1079     s->frame_timer = qemu_new_timer(vm_clock, uhci_frame_timer, s);
1080     s->num_ports_vmstate = NB_PORTS;
1081
1082     qemu_register_reset(uhci_reset, s);
1083
1084     /* Use region 4 for consistency with real hardware.  BSD guests seem
1085        to rely on this.  */
1086     pci_register_bar(&s->dev, 4, 0x20,
1087                            PCI_BASE_ADDRESS_SPACE_IO, uhci_map);
1088
1089     return 0;
1090 }
1091
1092 static int usb_uhci_piix3_initfn(PCIDevice *dev)
1093 {
1094     UHCIState *s = DO_UPCAST(UHCIState, dev, dev);
1095     uint8_t *pci_conf = s->dev.config;
1096
1097     pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_INTEL);
1098     pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_INTEL_82371SB_2);
1099     return usb_uhci_common_initfn(s);
1100 }
1101
1102 static int usb_uhci_piix4_initfn(PCIDevice *dev)
1103 {
1104     UHCIState *s = DO_UPCAST(UHCIState, dev, dev);
1105     uint8_t *pci_conf = s->dev.config;
1106
1107     pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_INTEL);
1108     pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_INTEL_82371AB_2);
1109     return usb_uhci_common_initfn(s);
1110 }
1111
1112 static PCIDeviceInfo uhci_info[] = {
1113     {
1114         .qdev.name    = "piix3-usb-uhci",
1115         .qdev.size    = sizeof(UHCIState),
1116         .qdev.vmsd    = &vmstate_uhci,
1117         .init         = usb_uhci_piix3_initfn,
1118     },{
1119         .qdev.name    = "piix4-usb-uhci",
1120         .qdev.size    = sizeof(UHCIState),
1121         .qdev.vmsd    = &vmstate_uhci,
1122         .init         = usb_uhci_piix4_initfn,
1123     },{
1124         /* end of list */
1125     }
1126 };
1127
1128 static void uhci_register(void)
1129 {
1130     pci_qdev_register_many(uhci_info);
1131 }
1132 device_init(uhci_register);
1133
1134 void usb_uhci_piix3_init(PCIBus *bus, int devfn)
1135 {
1136     pci_create_simple(bus, devfn, "piix3-usb-uhci");
1137 }
1138
1139 void usb_uhci_piix4_init(PCIBus *bus, int devfn)
1140 {
1141     pci_create_simple(bus, devfn, "piix4-usb-uhci");
1142 }