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   isoc;
 116     uint8_t   done;
 117     uint8_t   buffer[2048];
 118 } UHCIAsync;
 119
 120 typedef struct UHCIPort {
 121     USBPort port;
 122     uint16_t ctrl;
 123 } UHCIPort;
 124
 125 typedef struct UHCIState {
 126     PCIDevice dev;
 127     USBBus bus;
 128     uint16_t cmd; /* cmd register */
 129     uint16_t status;
 130     uint16_t intr; /* interrupt enable register */
 131     uint16_t frnum; /* frame number */
 132     uint32_t fl_base_addr; /* frame list base address */
 133     uint8_t sof_timing;
 134     uint8_t status2; /* bit 0 and 1 are used to generate UHCI_STS_USBINT */
 135     int64_t expire_time;
 136     QEMUTimer *frame_timer;
 137     UHCIPort ports[NB_PORTS];
 138
 139     /* Interrupts that should be raised at the end of the current frame.  */
 140     uint32_t pending_int_mask;
 141
 142     /* Active packets */
 143     UHCIAsync *async_pending;
 144     UHCIAsync *async_pool;
 145     uint8_t num_ports_vmstate;
 146 } UHCIState;
 147
 148 typedef struct UHCI_TD {
 149     uint32_t link;
 150     uint32_t ctrl; /* see TD_CTRL_xxx */
 151     uint32_t token;
 152     uint32_t buffer;
 153 } UHCI_TD;
 154
 155 typedef struct UHCI_QH {
 156     uint32_t link;
 157     uint32_t el_link;
 158 } UHCI_QH;
 159
 160 static UHCIAsync *uhci_async_alloc(UHCIState *s)
 161 {
 162     UHCIAsync *async = qemu_malloc(sizeof(UHCIAsync));
 163
 164     memset(&async->packet, 0, sizeof(async->packet));
 165     async->valid = 0;
 166     async->td    = 0;
 167     async->token = 0;
 168     async->done  = 0;
 169     async->isoc  = 0;
 170     async->next  = NULL;
 171
 172     return async;
 173 }
 174
 175 static void uhci_async_free(UHCIState *s, UHCIAsync *async)
 176 {
 177     qemu_free(async);
 178 }
 179
 180 static void uhci_async_link(UHCIState *s, UHCIAsync *async)
 181 {
 182     async->next = s->async_pending;
 183     s->async_pending = async;
 184 }
 185
 186 static void uhci_async_unlink(UHCIState *s, UHCIAsync *async)
 187 {
 188     UHCIAsync *curr = s->async_pending;
 189     UHCIAsync **prev = &s->async_pending;
 190
 191     while (curr) {
 192         if (curr == async) {
 193             *prev = curr->next;
 194             return;
 195         }
 196
 197         prev = &curr->next;
 198         curr = curr->next;
 199     }
 200 }
 201
 202 static void uhci_async_cancel(UHCIState *s, UHCIAsync *async)
 203 {
 204     DPRINTF("uhci: cancel td 0x%x token 0x%x done %u\n",
 205            async->td, async->token, async->done);
 206
 207     if (!async->done)
 208         usb_cancel_packet(&async->packet);
 209     uhci_async_free(s, async);
 210 }
 211
 212 /*
 213  * Mark all outstanding async packets as invalid.
 214  * This is used for canceling them when TDs are removed by the HCD.
 215  */
 216 static UHCIAsync *uhci_async_validate_begin(UHCIState *s)
 217 {
 218     UHCIAsync *async = s->async_pending;
 219
 220     while (async) {
 221         async->valid--;
 222         async = async->next;
 223     }
 224     return NULL;
 225 }
 226
 227 /*
 228  * Cancel async packets that are no longer valid
 229  */
 230 static void uhci_async_validate_end(UHCIState *s)
 231 {
 232     UHCIAsync *curr = s->async_pending;
 233     UHCIAsync **prev = &s->async_pending;
 234     UHCIAsync *next;
 235
 236     while (curr) {
 237         if (curr->valid > 0) {
 238             prev = &curr->next;
 239             curr = curr->next;
 240             continue;
 241         }
 242
 243         next = curr->next;
 244
 245         /* Unlink */
 246         *prev = next;
 247
 248         uhci_async_cancel(s, curr);
 249
 250         curr = next;
 251     }
 252 }
 253
 254 static void uhci_async_cancel_all(UHCIState *s)
 255 {
 256     UHCIAsync *curr = s->async_pending;
 257     UHCIAsync *next;
 258
 259     while (curr) {
 260         next = curr->next;
 261
 262         uhci_async_cancel(s, curr);
 263
 264         curr = next;
 265     }
 266
 267     s->async_pending = NULL;
 268 }
 269
 270 static UHCIAsync *uhci_async_find_td(UHCIState *s, uint32_t addr, uint32_t token)
 271 {
 272     UHCIAsync *async = s->async_pending;
 273     UHCIAsync *match = NULL;
 274     int count = 0;
 275
 276     /*
 277      * We're looking for the best match here. ie both td addr and token.
 278      * Otherwise we return last good match. ie just token.
 279      * It's ok to match just token because it identifies the transaction
 280      * rather well, token includes: device addr, endpoint, size, etc.
 281      *
 282      * Also since we queue async transactions in reverse order by returning
 283      * last good match we restores the order.
 284      *
 285      * It's expected that we wont have a ton of outstanding transactions.
 286      * If we ever do we'd want to optimize this algorithm.
 287      */
 288
 289     while (async) {
 290         if (async->token == token) {
 291             /* Good match */
 292             match = async;
 293
 294             if (async->td == addr) {
 295                 /* Best match */
 296                 break;
 297             }
 298         }
 299
 300         async = async->next;
 301         count++;
 302     }
 303
 304     if (count > 64)
 305         fprintf(stderr, "uhci: warning lots of async transactions\n");
 306
 307     return match;
 308 }
 309
 310 static void uhci_attach(USBPort *port1, USBDevice *dev);
 311
 312 static void uhci_update_irq(UHCIState *s)
 313 {
 314     int level;
 315     if (((s->status2 & 1) && (s->intr & (1 << 2))) ||
 316         ((s->status2 & 2) && (s->intr & (1 << 3))) ||
 317         ((s->status & UHCI_STS_USBERR) && (s->intr & (1 << 0))) ||
 318         ((s->status & UHCI_STS_RD) && (s->intr & (1 << 1))) ||
 319         (s->status & UHCI_STS_HSERR) ||
 320         (s->status & UHCI_STS_HCPERR)) {
 321         level = 1;
 322     } else {
 323         level = 0;
 324     }
 325     qemu_set_irq(s->dev.irq[3], level);
 326 }
 327
 328 static void uhci_reset(void *opaque)
 329 {
 330     UHCIState *s = opaque;
 331     uint8_t *pci_conf;
 332     int i;
 333     UHCIPort *port;
 334
 335     DPRINTF("uhci: full reset\n");
 336
 337     pci_conf = s->dev.config;
 338
 339     pci_conf[0x6a] = 0x01; /* usb clock */
 340     pci_conf[0x6b] = 0x00;
 341     s->cmd = 0;
 342     s->status = 0;
 343     s->status2 = 0;
 344     s->intr = 0;
 345     s->fl_base_addr = 0;
 346     s->sof_timing = 64;
 347
 348     for(i = 0; i < NB_PORTS; i++) {
 349         port = &s->ports[i];
 350         port->ctrl = 0x0080;
 351         if (port->port.dev)
 352             uhci_attach(&port->port, port->port.dev);
 353     }
 354
 355     uhci_async_cancel_all(s);
 356 }
 357
 358 static void uhci_pre_save(void *opaque)
 359 {
 360     UHCIState *s = opaque;
 361
 362     uhci_async_cancel_all(s);
 363 }
 364
 365 static const VMStateDescription vmstate_uhci_port = {
 366     .name = "uhci port",
 367     .version_id = 1,
 368     .minimum_version_id = 1,
 369     .minimum_version_id_old = 1,
 370     .fields      = (VMStateField []) {
 371         VMSTATE_UINT16(ctrl, UHCIPort),
 372         VMSTATE_END_OF_LIST()
 373     }
 374 };
 375
 376 static const VMStateDescription vmstate_uhci = {
 377     .name = "uhci",
 378     .version_id = 2,
 379     .minimum_version_id = 1,
 380     .minimum_version_id_old = 1,
 381     .pre_save = uhci_pre_save,
 382     .fields      = (VMStateField []) {
 383         VMSTATE_PCI_DEVICE(dev, UHCIState),
 384         VMSTATE_UINT8_EQUAL(num_ports_vmstate, UHCIState),
 385         VMSTATE_STRUCT_ARRAY(ports, UHCIState, NB_PORTS, 1,
 386                              vmstate_uhci_port, UHCIPort),
 387         VMSTATE_UINT16(cmd, UHCIState),
 388         VMSTATE_UINT16(status, UHCIState),
 389         VMSTATE_UINT16(intr, UHCIState),
 390         VMSTATE_UINT16(frnum, UHCIState),
 391         VMSTATE_UINT32(fl_base_addr, UHCIState),
 392         VMSTATE_UINT8(sof_timing, UHCIState),
 393         VMSTATE_UINT8(status2, UHCIState),
 394         VMSTATE_TIMER(frame_timer, UHCIState),
 395         VMSTATE_INT64_V(expire_time, UHCIState, 2),
 396         VMSTATE_END_OF_LIST()
 397     }
 398 };
 399
 400 static void uhci_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)
 401 {
 402     UHCIState *s = opaque;
 403
 404     addr &= 0x1f;
 405     switch(addr) {
 406     case 0x0c:
 407         s->sof_timing = val;
 408         break;
 409     }
 410 }
 411
 412 static uint32_t uhci_ioport_readb(void *opaque, uint32_t addr)
 413 {
 414     UHCIState *s = opaque;
 415     uint32_t val;
 416
 417     addr &= 0x1f;
 418     switch(addr) {
 419     case 0x0c:
 420         val = s->sof_timing;
 421         break;
 422     default:
 423         val = 0xff;
 424         break;
 425     }
 426     return val;
 427 }
 428
 429 static void uhci_ioport_writew(void *opaque, uint32_t addr, uint32_t val)
 430 {
 431     UHCIState *s = opaque;
 432
 433     addr &= 0x1f;
 434     DPRINTF("uhci: writew port=0x%04x val=0x%04x\n", addr, val);
 435
 436     switch(addr) {
 437     case 0x00:
 438         if ((val & UHCI_CMD_RS) && !(s->cmd & UHCI_CMD_RS)) {
 439             /* start frame processing */
 440             qemu_mod_timer(s->frame_timer, qemu_get_clock(vm_clock));
 441             s->status &= ~UHCI_STS_HCHALTED;
 442         } else if (!(val & UHCI_CMD_RS)) {
 443             s->status |= UHCI_STS_HCHALTED;
 444         }
 445         if (val & UHCI_CMD_GRESET) {
 446             UHCIPort *port;
 447             USBDevice *dev;
 448             int i;
 449
 450             /* send reset on the USB bus */
 451             for(i = 0; i < NB_PORTS; i++) {
 452                 port = &s->ports[i];
 453                 dev = port->port.dev;
 454                 if (dev) {
 455                     usb_send_msg(dev, USB_MSG_RESET);
 456                 }
 457             }
 458             uhci_reset(s);
 459             return;
 460         }
 461         if (val & UHCI_CMD_HCRESET) {
 462             uhci_reset(s);
 463             return;
 464         }
 465         s->cmd = val;
 466         break;
 467     case 0x02:
 468         s->status &= ~val;
 469         /* XXX: the chip spec is not coherent, so we add a hidden
 470            register to distinguish between IOC and SPD */
 471         if (val & UHCI_STS_USBINT)
 472             s->status2 = 0;
 473         uhci_update_irq(s);
 474         break;
 475     case 0x04:
 476         s->intr = val;
 477         uhci_update_irq(s);
 478         break;
 479     case 0x06:
 480         if (s->status & UHCI_STS_HCHALTED)
 481             s->frnum = val & 0x7ff;
 482         break;
 483     case 0x10 ... 0x1f:
 484         {
 485             UHCIPort *port;
 486             USBDevice *dev;
 487             int n;
 488
 489             n = (addr >> 1) & 7;
 490             if (n >= NB_PORTS)
 491                 return;
 492             port = &s->ports[n];
 493             dev = port->port.dev;
 494             if (dev) {
 495                 /* port reset */
 496                 if ( (val & UHCI_PORT_RESET) &&
 497                      !(port->ctrl & UHCI_PORT_RESET) ) {
 498                     usb_send_msg(dev, USB_MSG_RESET);
 499                 }
 500             }
 501             port->ctrl = (port->ctrl & 0x01fb) | (val & ~0x01fb);
 502             /* some bits are reset when a '1' is written to them */
 503             port->ctrl &= ~(val & 0x000a);
 504         }
 505         break;
 506     }
 507 }
 508
 509 static uint32_t uhci_ioport_readw(void *opaque, uint32_t addr)
 510 {
 511     UHCIState *s = opaque;
 512     uint32_t val;
 513
 514     addr &= 0x1f;
 515     switch(addr) {
 516     case 0x00:
 517         val = s->cmd;
 518         break;
 519     case 0x02:
 520         val = s->status;
 521         break;
 522     case 0x04:
 523         val = s->intr;
 524         break;
 525     case 0x06:
 526         val = s->frnum;
 527         break;
 528     case 0x10 ... 0x1f:
 529         {
 530             UHCIPort *port;
 531             int n;
 532             n = (addr >> 1) & 7;
 533             if (n >= NB_PORTS)
 534                 goto read_default;
 535             port = &s->ports[n];
 536             val = port->ctrl;
 537         }
 538         break;
 539     default:
 540     read_default:
 541         val = 0xff7f; /* disabled port */
 542         break;
 543     }
 544
 545     DPRINTF("uhci: readw port=0x%04x val=0x%04x\n", addr, val);
 546
 547     return val;
 548 }
 549
 550 static void uhci_ioport_writel(void *opaque, uint32_t addr, uint32_t val)
 551 {
 552     UHCIState *s = opaque;
 553
 554     addr &= 0x1f;
 555     DPRINTF("uhci: writel port=0x%04x val=0x%08x\n", addr, val);
 556
 557     switch(addr) {
 558     case 0x08:
 559         s->fl_base_addr = val & ~0xfff;
 560         break;
 561     }
 562 }
 563
 564 static uint32_t uhci_ioport_readl(void *opaque, uint32_t addr)
 565 {
 566     UHCIState *s = opaque;
 567     uint32_t val;
 568
 569     addr &= 0x1f;
 570     switch(addr) {
 571     case 0x08:
 572         val = s->fl_base_addr;
 573         break;
 574     default:
 575         val = 0xffffffff;
 576         break;
 577     }
 578     return val;
 579 }
 580
 581 /* signal resume if controller suspended */
 582 static void uhci_resume (void *opaque)
 583 {
 584     UHCIState *s = (UHCIState *)opaque;
 585
 586     if (!s)
 587         return;
 588
 589     if (s->cmd & UHCI_CMD_EGSM) {
 590         s->cmd |= UHCI_CMD_FGR;
 591         s->status |= UHCI_STS_RD;
 592         uhci_update_irq(s);
 593     }
 594 }
 595
 596 static void uhci_attach(USBPort *port1, USBDevice *dev)
 597 {
 598     UHCIState *s = port1->opaque;
 599     UHCIPort *port = &s->ports[port1->index];
 600
 601     if (dev) {
 602         if (port->port.dev) {
 603             usb_attach(port1, NULL);
 604         }
 605         /* set connect status */
 606         port->ctrl |= UHCI_PORT_CCS | UHCI_PORT_CSC;
 607
 608         /* update speed */
 609         if (dev->speed == USB_SPEED_LOW)
 610             port->ctrl |= UHCI_PORT_LSDA;
 611         else
 612             port->ctrl &= ~UHCI_PORT_LSDA;
 613
 614         uhci_resume(s);
 615
 616         port->port.dev = dev;
 617         /* send the attach message */
 618         usb_send_msg(dev, USB_MSG_ATTACH);
 619     } else {
 620         /* set connect status */
 621         if (port->ctrl & UHCI_PORT_CCS) {
 622             port->ctrl &= ~UHCI_PORT_CCS;
 623             port->ctrl |= UHCI_PORT_CSC;
 624         }
 625         /* disable port */
 626         if (port->ctrl & UHCI_PORT_EN) {
 627             port->ctrl &= ~UHCI_PORT_EN;
 628             port->ctrl |= UHCI_PORT_ENC;
 629         }
 630
 631         uhci_resume(s);
 632
 633         dev = port->port.dev;
 634         if (dev) {
 635             /* send the detach message */
 636             usb_send_msg(dev, USB_MSG_DETACH);
 637         }
 638         port->port.dev = NULL;
 639     }
 640 }
 641
 642 static int uhci_broadcast_packet(UHCIState *s, USBPacket *p)
 643 {
 644     int i, ret;
 645
 646     DPRINTF("uhci: packet enter. pid %s addr 0x%02x ep %d len %d\n",
 647            pid2str(p->pid), p->devaddr, p->devep, p->len);
 648     if (p->pid == USB_TOKEN_OUT || p->pid == USB_TOKEN_SETUP)
 649         dump_data(p->data, p->len);
 650
 651     ret = USB_RET_NODEV;
 652     for (i = 0; i < NB_PORTS && ret == USB_RET_NODEV; i++) {
 653         UHCIPort *port = &s->ports[i];
 654         USBDevice *dev = port->port.dev;
 655
 656         if (dev && (port->ctrl & UHCI_PORT_EN))
 657             ret = dev->info->handle_packet(dev, p);
 658     }
 659
 660     DPRINTF("uhci: packet exit. ret %d len %d\n", ret, p->len);
 661     if (p->pid == USB_TOKEN_IN && ret > 0)
 662         dump_data(p->data, ret);
 663
 664     return ret;
 665 }
 666
 667 static void uhci_async_complete(USBPacket * packet, void *opaque);
 668 static void uhci_process_frame(UHCIState *s);
 669
 670 /* return -1 if fatal error (frame must be stopped)
 671           0 if TD successful
 672           1 if TD unsuccessful or inactive
 673 */
 674 static int uhci_complete_td(UHCIState *s, UHCI_TD *td, UHCIAsync *async, uint32_t *int_mask)
 675 {
 676     int len = 0, max_len, err, ret;
 677     uint8_t pid;
 678
 679     max_len = ((td->token >> 21) + 1) & 0x7ff;
 680     pid = td->token & 0xff;
 681
 682     ret = async->packet.len;
 683
 684     if (td->ctrl & TD_CTRL_IOS)
 685         td->ctrl &= ~TD_CTRL_ACTIVE;
 686
 687     if (ret < 0)
 688         goto out;
 689
 690     len = async->packet.len;
 691     td->ctrl = (td->ctrl & ~0x7ff) | ((len - 1) & 0x7ff);
 692
 693     /* The NAK bit may have been set by a previous frame, so clear it
 694        here.  The docs are somewhat unclear, but win2k relies on this
 695        behavior.  */
 696     td->ctrl &= ~(TD_CTRL_ACTIVE | TD_CTRL_NAK);
 697     if (td->ctrl & TD_CTRL_IOC)
 698         *int_mask |= 0x01;
 699
 700     if (pid == USB_TOKEN_IN) {
 701         if (len > max_len) {
 702             ret = USB_RET_BABBLE;
 703             goto out;
 704         }
 705
 706         if (len > 0) {
 707             /* write the data back */
 708             cpu_physical_memory_write(td->buffer, async->buffer, len);
 709         }
 710
 711         if ((td->ctrl & TD_CTRL_SPD) && len < max_len) {
 712             *int_mask |= 0x02;
 713             /* short packet: do not update QH */
 714             DPRINTF("uhci: short packet. td 0x%x token 0x%x\n", async->td, async->token);
 715             return 1;
 716         }
 717     }
 718
 719     /* success */
 720     return 0;
 721
 722 out:
 723     switch(ret) {
 724     case USB_RET_STALL:
 725         td->ctrl |= TD_CTRL_STALL;
 726         td->ctrl &= ~TD_CTRL_ACTIVE;
 727         return 1;
 728
 729     case USB_RET_BABBLE:
 730         td->ctrl |= TD_CTRL_BABBLE | TD_CTRL_STALL;
 731         td->ctrl &= ~TD_CTRL_ACTIVE;
 732         /* frame interrupted */
 733         return -1;
 734
 735     case USB_RET_NAK:
 736         td->ctrl |= TD_CTRL_NAK;
 737         if (pid == USB_TOKEN_SETUP)
 738             break;
 739         return 1;
 740
 741     case USB_RET_NODEV:
 742     default:
 743         break;
 744     }
 745
 746     /* Retry the TD if error count is not zero */
 747
 748     td->ctrl |= TD_CTRL_TIMEOUT;
 749     err = (td->ctrl >> TD_CTRL_ERROR_SHIFT) & 3;
 750     if (err != 0) {
 751         err--;
 752         if (err == 0) {
 753             td->ctrl &= ~TD_CTRL_ACTIVE;
 754             s->status |= UHCI_STS_USBERR;
 755             if (td->ctrl & TD_CTRL_IOC)
 756                 *int_mask |= 0x01;
 757             uhci_update_irq(s);
 758         }
 759     }
 760     td->ctrl = (td->ctrl & ~(3 << TD_CTRL_ERROR_SHIFT)) |
 761         (err << TD_CTRL_ERROR_SHIFT);
 762     return 1;
 763 }
 764
 765 static int uhci_handle_td(UHCIState *s, uint32_t addr, UHCI_TD *td, uint32_t *int_mask)
 766 {
 767     UHCIAsync *async;
 768     int len = 0, max_len;
 769     uint8_t pid, isoc;
 770     uint32_t token;
 771
 772     /* Is active ? */
 773     if (!(td->ctrl & TD_CTRL_ACTIVE))
 774         return 1;
 775
 776     /* token field is not unique for isochronous requests,
 777      * so use the destination buffer
 778      */
 779     if (td->ctrl & TD_CTRL_IOS) {
 780         token = td->buffer;
 781         isoc = 1;
 782     } else {
 783         token = td->token;
 784         isoc = 0;
 785     }
 786
 787     async = uhci_async_find_td(s, addr, token);
 788     if (async) {
 789         /* Already submitted */
 790         async->valid = 32;
 791
 792         if (!async->done)
 793             return 1;
 794
 795         uhci_async_unlink(s, async);
 796         goto done;
 797     }
 798
 799     /* Allocate new packet */
 800     async = uhci_async_alloc(s);
 801     if (!async)
 802         return 1;
 803
 804     /* valid needs to be large enough to handle 10 frame delay
 805      * for initial isochronous requests
 806      */
 807     async->valid = 32;
 808     async->td    = addr;
 809     async->token = token;
 810     async->isoc  = isoc;
 811
 812     max_len = ((td->token >> 21) + 1) & 0x7ff;
 813     pid = td->token & 0xff;
 814
 815     async->packet.pid     = pid;
 816     async->packet.devaddr = (td->token >> 8) & 0x7f;
 817     async->packet.devep   = (td->token >> 15) & 0xf;
 818     async->packet.data    = async->buffer;
 819     async->packet.len     = max_len;
 820     async->packet.complete_cb     = uhci_async_complete;
 821     async->packet.complete_opaque = s;
 822
 823     switch(pid) {
 824     case USB_TOKEN_OUT:
 825     case USB_TOKEN_SETUP:
 826         cpu_physical_memory_read(td->buffer, async->buffer, max_len);
 827         len = uhci_broadcast_packet(s, &async->packet);
 828         if (len >= 0)
 829             len = max_len;
 830         break;
 831
 832     case USB_TOKEN_IN:
 833         len = uhci_broadcast_packet(s, &async->packet);
 834         break;
 835
 836     default:
 837         /* invalid pid : frame interrupted */
 838         uhci_async_free(s, async);
 839         s->status |= UHCI_STS_HCPERR;
 840         uhci_update_irq(s);
 841         return -1;
 842     }
 843
 844     if (len == USB_RET_ASYNC) {
 845         uhci_async_link(s, async);
 846         return 2;
 847     }
 848
 849     async->packet.len = len;
 850
 851 done:
 852     len = uhci_complete_td(s, td, async, int_mask);
 853     uhci_async_free(s, async);
 854     return len;
 855 }
 856
 857 static void uhci_async_complete(USBPacket *packet, void *opaque)
 858 {
 859     UHCIState *s = opaque;
 860     UHCIAsync *async = (UHCIAsync *) packet;
 861
 862     DPRINTF("uhci: async complete. td 0x%x token 0x%x\n", async->td, async->token);
 863
 864     if (async->isoc) {
 865         UHCI_TD td;
 866         uint32_t link = async->td;
 867         uint32_t int_mask = 0, val;
 868
 869         cpu_physical_memory_read(link & ~0xf, (uint8_t *) &td, sizeof(td));
 870         le32_to_cpus(&td.link);
 871         le32_to_cpus(&td.ctrl);
 872         le32_to_cpus(&td.token);
 873         le32_to_cpus(&td.buffer);
 874
 875         uhci_async_unlink(s, async);
 876         uhci_complete_td(s, &td, async, &int_mask);
 877         s->pending_int_mask |= int_mask;
 878
 879         /* update the status bits of the TD */
 880         val = cpu_to_le32(td.ctrl);
 881         cpu_physical_memory_write((link & ~0xf) + 4,
 882                                   (const uint8_t *)&val, sizeof(val));
 883         uhci_async_free(s, async);
 884     } else {
 885         async->done = 1;
 886         uhci_process_frame(s);
 887     }
 888 }
 889
 890 static int is_valid(uint32_t link)
 891 {
 892     return (link & 1) == 0;
 893 }
 894
 895 static int is_qh(uint32_t link)
 896 {
 897     return (link & 2) != 0;
 898 }
 899
 900 static int depth_first(uint32_t link)
 901 {
 902     return (link & 4) != 0;
 903 }
 904
 905 /* QH DB used for detecting QH loops */
 906 #define UHCI_MAX_QUEUES 128
 907 typedef struct {
 908     uint32_t addr[UHCI_MAX_QUEUES];
 909     int      count;
 910 } QhDb;
 911
 912 static void qhdb_reset(QhDb *db)
 913 {
 914     db->count = 0;
 915 }
 916
 917 /* Add QH to DB. Returns 1 if already present or DB is full. */
 918 static int qhdb_insert(QhDb *db, uint32_t addr)
 919 {
 920     int i;
 921     for (i = 0; i < db->count; i++)
 922         if (db->addr[i] == addr)
 923             return 1;
 924
 925     if (db->count >= UHCI_MAX_QUEUES)
 926         return 1;
 927
 928     db->addr[db->count++] = addr;
 929     return 0;
 930 }
 931
 932 static void uhci_process_frame(UHCIState *s)
 933 {
 934     uint32_t frame_addr, link, old_td_ctrl, val, int_mask;
 935     uint32_t curr_qh;
 936     int cnt, ret;
 937     UHCI_TD td;
 938     UHCI_QH qh;
 939     QhDb qhdb;
 940
 941     frame_addr = s->fl_base_addr + ((s->frnum & 0x3ff) << 2);
 942
 943     DPRINTF("uhci: processing frame %d addr 0x%x\n" , s->frnum, frame_addr);
 944
 945     cpu_physical_memory_read(frame_addr, (uint8_t *)&link, 4);
 946     le32_to_cpus(&link);
 947
 948     int_mask = 0;
 949     curr_qh  = 0;
 950
 951     qhdb_reset(&qhdb);
 952
 953     for (cnt = FRAME_MAX_LOOPS; is_valid(link) && cnt; cnt--) {
 954         if (is_qh(link)) {
 955             /* QH */
 956
 957             if (qhdb_insert(&qhdb, link)) {
 958                 /*
 959                  * We're going in circles. Which is not a bug because
 960                  * HCD is allowed to do that as part of the BW management.
 961                  * In our case though it makes no sense to spin here. Sync transations
 962                  * are already done, and async completion handler will re-process
 963                  * the frame when something is ready.
 964                  */
 965                 DPRINTF("uhci: detected loop. qh 0x%x\n", link);
 966                 break;
 967             }
 968
 969             cpu_physical_memory_read(link & ~0xf, (uint8_t *) &qh, sizeof(qh));
 970             le32_to_cpus(&qh.link);
 971             le32_to_cpus(&qh.el_link);
 972
 973             DPRINTF("uhci: QH 0x%x load. link 0x%x elink 0x%x\n",
 974                     link, qh.link, qh.el_link);
 975
 976             if (!is_valid(qh.el_link)) {
 977                 /* QH w/o elements */
 978                 curr_qh = 0;
 979                 link = qh.link;
 980             } else {
 981                 /* QH with elements */
 982                 curr_qh = link;
 983                 link = qh.el_link;
 984             }
 985             continue;
 986         }
 987
 988         /* TD */
 989         cpu_physical_memory_read(link & ~0xf, (uint8_t *) &td, sizeof(td));
 990         le32_to_cpus(&td.link);
 991         le32_to_cpus(&td.ctrl);
 992         le32_to_cpus(&td.token);
 993         le32_to_cpus(&td.buffer);
 994
 995         DPRINTF("uhci: TD 0x%x load. link 0x%x ctrl 0x%x token 0x%x qh 0x%x\n",
 996                 link, td.link, td.ctrl, td.token, curr_qh);
 997
 998         old_td_ctrl = td.ctrl;
 999         ret = uhci_handle_td(s, link, &td, &int_mask);
1000         if (old_td_ctrl != td.ctrl) {
1001             /* update the status bits of the TD */
1002             val = cpu_to_le32(td.ctrl);
1003             cpu_physical_memory_write((link & ~0xf) + 4,
1004                                       (const uint8_t *)&val, sizeof(val));
1005         }
1006
1007         if (ret < 0) {
1008             /* interrupted frame */
1009             break;
1010         }
1011
1012         if (ret == 2 || ret == 1) {
1013             DPRINTF("uhci: TD 0x%x %s. link 0x%x ctrl 0x%x token 0x%x qh 0x%x\n",
1014                     link, ret == 2 ? "pend" : "skip",
1015                     td.link, td.ctrl, td.token, curr_qh);
1016
1017             link = curr_qh ? qh.link : td.link;
1018             continue;
1019         }
1020
1021         /* completed TD */
1022
1023         DPRINTF("uhci: TD 0x%x done. link 0x%x ctrl 0x%x token 0x%x qh 0x%x\n",
1024                 link, td.link, td.ctrl, td.token, curr_qh);
1025
1026         link = td.link;
1027
1028         if (curr_qh) {
1029             /* update QH element link */
1030             qh.el_link = link;
1031             val = cpu_to_le32(qh.el_link);
1032             cpu_physical_memory_write((curr_qh & ~0xf) + 4,
1033                                           (const uint8_t *)&val, sizeof(val));
1034
1035             if (!depth_first(link)) {
1036                /* done with this QH */
1037
1038                DPRINTF("uhci: QH 0x%x done. link 0x%x elink 0x%x\n",
1039                        curr_qh, qh.link, qh.el_link);
1040
1041                curr_qh = 0;
1042                link    = qh.link;
1043             }
1044         }
1045
1046         /* go to the next entry */
1047     }
1048
1049     s->pending_int_mask |= int_mask;
1050 }
1051
1052 static void uhci_frame_timer(void *opaque)
1053 {
1054     UHCIState *s = opaque;
1055
1056     /* prepare the timer for the next frame */
1057     s->expire_time += (get_ticks_per_sec() / FRAME_TIMER_FREQ);
1058
1059     if (!(s->cmd & UHCI_CMD_RS)) {
1060         /* Full stop */
1061         qemu_del_timer(s->frame_timer);
1062         /* set hchalted bit in status - UHCI11D 2.1.2 */
1063         s->status |= UHCI_STS_HCHALTED;
1064
1065         DPRINTF("uhci: halted\n");
1066         return;
1067     }
1068
1069     /* Complete the previous frame */
1070     if (s->pending_int_mask) {
1071         s->status2 |= s->pending_int_mask;
1072         s->status  |= UHCI_STS_USBINT;
1073         uhci_update_irq(s);
1074     }
1075     s->pending_int_mask = 0;
1076
1077     /* Start new frame */
1078     s->frnum = (s->frnum + 1) & 0x7ff;
1079
1080     DPRINTF("uhci: new frame #%u\n" , s->frnum);
1081
1082     uhci_async_validate_begin(s);
1083
1084     uhci_process_frame(s);
1085
1086     uhci_async_validate_end(s);
1087
1088     qemu_mod_timer(s->frame_timer, s->expire_time);
1089 }
1090
1091 static void uhci_map(PCIDevice *pci_dev, int region_num,
1092                     pcibus_t addr, pcibus_t size, int type)
1093 {
1094     UHCIState *s = (UHCIState *)pci_dev;
1095
1096     register_ioport_write(addr, 32, 2, uhci_ioport_writew, s);
1097     register_ioport_read(addr, 32, 2, uhci_ioport_readw, s);
1098     register_ioport_write(addr, 32, 4, uhci_ioport_writel, s);
1099     register_ioport_read(addr, 32, 4, uhci_ioport_readl, s);
1100     register_ioport_write(addr, 32, 1, uhci_ioport_writeb, s);
1101     register_ioport_read(addr, 32, 1, uhci_ioport_readb, s);
1102 }
1103
1104 static int usb_uhci_common_initfn(UHCIState *s)
1105 {
1106     uint8_t *pci_conf = s->dev.config;
1107     int i;
1108
1109     pci_conf[PCI_REVISION_ID] = 0x01; // revision number
1110     pci_conf[PCI_CLASS_PROG] = 0x00;
1111     pci_config_set_class(pci_conf, PCI_CLASS_SERIAL_USB);
1112     /* TODO: reset value should be 0. */
1113     pci_conf[PCI_INTERRUPT_PIN] = 4; // interrupt pin 3
1114     pci_conf[0x60] = 0x10; // release number
1115
1116     usb_bus_new(&s->bus, &s->dev.qdev);
1117     for(i = 0; i < NB_PORTS; i++) {
1118         usb_register_port(&s->bus, &s->ports[i].port, s, i, NULL, uhci_attach);
1119     }
1120     s->frame_timer = qemu_new_timer(vm_clock, uhci_frame_timer, s);
1121     s->expire_time = qemu_get_clock(vm_clock) +
1122         (get_ticks_per_sec() / FRAME_TIMER_FREQ);
1123     s->num_ports_vmstate = NB_PORTS;
1124
1125     qemu_register_reset(uhci_reset, s);
1126
1127     /* Use region 4 for consistency with real hardware.  BSD guests seem
1128        to rely on this.  */
1129     pci_register_bar(&s->dev, 4, 0x20,
1130                            PCI_BASE_ADDRESS_SPACE_IO, uhci_map);
1131
1132     return 0;
1133 }
1134
1135 static int usb_uhci_piix3_initfn(PCIDevice *dev)
1136 {
1137     UHCIState *s = DO_UPCAST(UHCIState, dev, dev);
1138     uint8_t *pci_conf = s->dev.config;
1139
1140     pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_INTEL);
1141     pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_INTEL_82371SB_2);
1142     return usb_uhci_common_initfn(s);
1143 }
1144
1145 static int usb_uhci_piix4_initfn(PCIDevice *dev)
1146 {
1147     UHCIState *s = DO_UPCAST(UHCIState, dev, dev);
1148     uint8_t *pci_conf = s->dev.config;
1149
1150     pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_INTEL);
1151     pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_INTEL_82371AB_2);
1152     return usb_uhci_common_initfn(s);
1153 }
1154
1155 static int usb_uhci_vt82c686b_initfn(PCIDevice *dev)
1156 {
1157     UHCIState *s = DO_UPCAST(UHCIState, dev, dev);
1158     uint8_t *pci_conf = s->dev.config;
1159
1160     pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_VIA);
1161     pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_VIA_UHCI);
1162
1163     /* USB misc control 1/2 */
1164     pci_set_long(pci_conf + 0x40,0x00001000);
1165     /* PM capability */
1166     pci_set_long(pci_conf + 0x80,0x00020001);
1167     /* USB legacy support  */
1168     pci_set_long(pci_conf + 0xc0,0x00002000);
1169
1170     return usb_uhci_common_initfn(s);
1171 }
1172
1173 static PCIDeviceInfo uhci_info[] = {
1174     {
1175         .qdev.name    = "piix3-usb-uhci",
1176         .qdev.size    = sizeof(UHCIState),
1177         .qdev.vmsd    = &vmstate_uhci,
1178         .init         = usb_uhci_piix3_initfn,
1179     },{
1180         .qdev.name    = "piix4-usb-uhci",
1181         .qdev.size    = sizeof(UHCIState),
1182         .qdev.vmsd    = &vmstate_uhci,
1183         .init         = usb_uhci_piix4_initfn,
1184     },{
1185         .qdev.name    = "vt82c686b-usb-uhci",
1186         .qdev.size    = sizeof(UHCIState),
1187         .qdev.vmsd    = &vmstate_uhci,
1188         .init         = usb_uhci_vt82c686b_initfn,
1189     },{
1190         /* end of list */
1191     }
1192 };
1193
1194 static void uhci_register(void)
1195 {
1196     pci_qdev_register_many(uhci_info);
1197 }
1198 device_init(uhci_register);
1199
1200 void usb_uhci_piix3_init(PCIBus *bus, int devfn)
1201 {
1202     pci_create_simple(bus, devfn, "piix3-usb-uhci");
1203 }
1204
1205 void usb_uhci_piix4_init(PCIBus *bus, int devfn)
1206 {
1207     pci_create_simple(bus, devfn, "piix4-usb-uhci");
1208 }
1209
1210 void usb_uhci_vt82c686b_init(PCIBus *bus, int devfn)
1211 {
1212     pci_create_simple(bus, devfn, "vt82c686b-usb-uhci");
1213 }