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
  33 //#define DEBUG
  34 //#define DEBUG_DUMP_DATA
  35
  36 #define UHCI_CMD_FGR      (1 << 4)
  37 #define UHCI_CMD_EGSM     (1 << 3)
  38 #define UHCI_CMD_GRESET   (1 << 2)
  39 #define UHCI_CMD_HCRESET  (1 << 1)
  40 #define UHCI_CMD_RS       (1 << 0)
  41
  42 #define UHCI_STS_HCHALTED (1 << 5)
  43 #define UHCI_STS_HCPERR   (1 << 4)
  44 #define UHCI_STS_HSERR    (1 << 3)
  45 #define UHCI_STS_RD       (1 << 2)
  46 #define UHCI_STS_USBERR   (1 << 1)
  47 #define UHCI_STS_USBINT   (1 << 0)
  48
  49 #define TD_CTRL_SPD     (1 << 29)
  50 #define TD_CTRL_ERROR_SHIFT  27
  51 #define TD_CTRL_IOS     (1 << 25)
  52 #define TD_CTRL_IOC     (1 << 24)
  53 #define TD_CTRL_ACTIVE  (1 << 23)
  54 #define TD_CTRL_STALL   (1 << 22)
  55 #define TD_CTRL_BABBLE  (1 << 20)
  56 #define TD_CTRL_NAK     (1 << 19)
  57 #define TD_CTRL_TIMEOUT (1 << 18)
  58
  59 #define UHCI_PORT_RESET (1 << 9)
  60 #define UHCI_PORT_LSDA  (1 << 8)
  61 #define UHCI_PORT_ENC   (1 << 3)
  62 #define UHCI_PORT_EN    (1 << 2)
  63 #define UHCI_PORT_CSC   (1 << 1)
  64 #define UHCI_PORT_CCS   (1 << 0)
  65
  66 #define FRAME_TIMER_FREQ 1000
  67
  68 #define FRAME_MAX_LOOPS  100
  69
  70 #define NB_PORTS 2
  71
  72 #ifdef DEBUG
  73 #define dprintf printf
  74
  75 const char *pid2str(int pid)
  76 {
  77     switch (pid) {
  78     case USB_TOKEN_SETUP: return "SETUP";
  79     case USB_TOKEN_IN:    return "IN";
  80     case USB_TOKEN_OUT:   return "OUT";
  81     }
  82     return "?";
  83 }
  84
  85 #else
  86 #define dprintf(...)
  87 #endif
  88
  89 #ifdef DEBUG_DUMP_DATA
  90 static void dump_data(const uint8_t *data, int len)
  91 {
  92     int i;
  93
  94     printf("uhci: data: ");
  95     for(i = 0; i < len; i++)
  96         printf(" %02x", data[i]);
  97     printf("\n");
  98 }
  99 #else
 100 static void dump_data(const uint8_t *data, int len) {}
 101 #endif
 102
 103 /*
 104  * Pending async transaction.
 105  * 'packet' must be the first field because completion
 106  * handler does "(UHCIAsync *) pkt" cast.
 107  */
 108 typedef struct UHCIAsync {
 109     USBPacket packet;
 110     struct UHCIAsync *next;
 111     uint32_t  td;
 112     uint32_t  token;
 113     int8_t    valid;
 114     uint8_t   done;
 115     uint8_t   buffer[2048];
 116 } UHCIAsync;
 117
 118 typedef struct UHCIPort {
 119     USBPort port;
 120     uint16_t ctrl;
 121 } UHCIPort;
 122
 123 typedef struct UHCIState {
 124     PCIDevice dev;
 125     uint16_t cmd; /* cmd register */
 126     uint16_t status;
 127     uint16_t intr; /* interrupt enable register */
 128     uint16_t frnum; /* frame number */
 129     uint32_t fl_base_addr; /* frame list base address */
 130     uint8_t sof_timing;
 131     uint8_t status2; /* bit 0 and 1 are used to generate UHCI_STS_USBINT */
 132     QEMUTimer *frame_timer;
 133     UHCIPort ports[NB_PORTS];
 134
 135     /* Interrupts that should be raised at the end of the current frame.  */
 136     uint32_t pending_int_mask;
 137
 138     /* Active packets */
 139     UHCIAsync *async_pending;
 140     UHCIAsync *async_pool;
 141 } UHCIState;
 142
 143 typedef struct UHCI_TD {
 144     uint32_t link;
 145     uint32_t ctrl; /* see TD_CTRL_xxx */
 146     uint32_t token;
 147     uint32_t buffer;
 148 } UHCI_TD;
 149
 150 typedef struct UHCI_QH {
 151     uint32_t link;
 152     uint32_t el_link;
 153 } UHCI_QH;
 154
 155 static UHCIAsync *uhci_async_alloc(UHCIState *s)
 156 {
 157     UHCIAsync *async = qemu_malloc(sizeof(UHCIAsync));
 158
 159     memset(&async->packet, 0, sizeof(async->packet));
 160     async->valid = 0;
 161     async->td    = 0;
 162     async->token = 0;
 163     async->done  = 0;
 164     async->next  = NULL;
 165
 166     return async;
 167 }
 168
 169 static void uhci_async_free(UHCIState *s, UHCIAsync *async)
 170 {
 171     qemu_free(async);
 172 }
 173
 174 static void uhci_async_link(UHCIState *s, UHCIAsync *async)
 175 {
 176     async->next = s->async_pending;
 177     s->async_pending = async;
 178 }
 179
 180 static void uhci_async_unlink(UHCIState *s, UHCIAsync *async)
 181 {
 182     UHCIAsync *curr = s->async_pending;
 183     UHCIAsync **prev = &s->async_pending;
 184
 185     while (curr) {
 186         if (curr == async) {
 187             *prev = curr->next;
 188             return;
 189         }
 190
 191         prev = &curr->next;
 192         curr = curr->next;
 193     }
 194 }
 195
 196 static void uhci_async_cancel(UHCIState *s, UHCIAsync *async)
 197 {
 198     dprintf("uhci: cancel td 0x%x token 0x%x done %u\n",
 199            async->td, async->token, async->done);
 200
 201     if (!async->done)
 202         usb_cancel_packet(&async->packet);
 203     uhci_async_free(s, async);
 204 }
 205
 206 /*
 207  * Mark all outstanding async packets as invalid.
 208  * This is used for canceling them when TDs are removed by the HCD.
 209  */
 210 static UHCIAsync *uhci_async_validate_begin(UHCIState *s)
 211 {
 212     UHCIAsync *async = s->async_pending;
 213
 214     while (async) {
 215         async->valid--;
 216         async = async->next;
 217     }
 218     return NULL;
 219 }
 220
 221 /*
 222  * Cancel async packets that are no longer valid
 223  */
 224 static void uhci_async_validate_end(UHCIState *s)
 225 {
 226     UHCIAsync *curr = s->async_pending;
 227     UHCIAsync **prev = &s->async_pending;
 228     UHCIAsync *next;
 229
 230     while (curr) {
 231         if (curr->valid > 0) {
 232             prev = &curr->next;
 233             curr = curr->next;
 234             continue;
 235         }
 236
 237         next = curr->next;
 238
 239         /* Unlink */
 240         *prev = next;
 241
 242         uhci_async_cancel(s, curr);
 243
 244         curr = next;
 245     }
 246 }
 247
 248 static void uhci_async_cancel_all(UHCIState *s)
 249 {
 250     UHCIAsync *curr = s->async_pending;
 251     UHCIAsync *next;
 252
 253     while (curr) {
 254         next = curr->next;
 255
 256         uhci_async_cancel(s, curr);
 257
 258         curr = next;
 259     }
 260
 261     s->async_pending = NULL;
 262 }
 263
 264 static UHCIAsync *uhci_async_find_td(UHCIState *s, uint32_t addr, uint32_t token)
 265 {
 266     UHCIAsync *async = s->async_pending;
 267     UHCIAsync *match = NULL;
 268     int count = 0;
 269
 270     /*
 271      * We're looking for the best match here. ie both td addr and token.
 272      * Otherwise we return last good match. ie just token.
 273      * It's ok to match just token because it identifies the transaction
 274      * rather well, token includes: device addr, endpoint, size, etc.
 275      *
 276      * Also since we queue async transactions in reverse order by returning
 277      * last good match we restores the order.
 278      *
 279      * It's expected that we wont have a ton of outstanding transactions.
 280      * If we ever do we'd want to optimize this algorithm.
 281      */
 282
 283     while (async) {
 284         if (async->token == token) {
 285             /* Good match */
 286             match = async;
 287
 288             if (async->td == addr) {
 289                 /* Best match */
 290                 break;
 291             }
 292         }
 293
 294         async = async->next;
 295         count++;
 296     }
 297
 298     if (count > 64)
 299         fprintf(stderr, "uhci: warning lots of async transactions\n");
 300
 301     return match;
 302 }
 303
 304 static void uhci_attach(USBPort *port1, USBDevice *dev);
 305
 306 static void uhci_update_irq(UHCIState *s)
 307 {
 308     int level;
 309     if (((s->status2 & 1) && (s->intr & (1 << 2))) ||
 310         ((s->status2 & 2) && (s->intr & (1 << 3))) ||
 311         ((s->status & UHCI_STS_USBERR) && (s->intr & (1 << 0))) ||
 312         ((s->status & UHCI_STS_RD) && (s->intr & (1 << 1))) ||
 313         (s->status & UHCI_STS_HSERR) ||
 314         (s->status & UHCI_STS_HCPERR)) {
 315         level = 1;
 316     } else {
 317         level = 0;
 318     }
 319     qemu_set_irq(s->dev.irq[3], level);
 320 }
 321
 322 static void uhci_reset(UHCIState *s)
 323 {
 324     uint8_t *pci_conf;
 325     int i;
 326     UHCIPort *port;
 327
 328     dprintf("uhci: full reset\n");
 329
 330     pci_conf = s->dev.config;
 331
 332     pci_conf[0x6a] = 0x01; /* usb clock */
 333     pci_conf[0x6b] = 0x00;
 334     s->cmd = 0;
 335     s->status = 0;
 336     s->status2 = 0;
 337     s->intr = 0;
 338     s->fl_base_addr = 0;
 339     s->sof_timing = 64;
 340
 341     for(i = 0; i < NB_PORTS; i++) {
 342         port = &s->ports[i];
 343         port->ctrl = 0x0080;
 344         if (port->port.dev)
 345             uhci_attach(&port->port, port->port.dev);
 346     }
 347
 348     uhci_async_cancel_all(s);
 349 }
 350
 351 static void uhci_save(QEMUFile *f, void *opaque)
 352 {
 353     UHCIState *s = opaque;
 354     uint8_t num_ports = NB_PORTS;
 355     int i;
 356
 357     uhci_async_cancel_all(s);
 358
 359     pci_device_save(&s->dev, f);
 360
 361     qemu_put_8s(f, &num_ports);
 362     for (i = 0; i < num_ports; ++i)
 363         qemu_put_be16s(f, &s->ports[i].ctrl);
 364     qemu_put_be16s(f, &s->cmd);
 365     qemu_put_be16s(f, &s->status);
 366     qemu_put_be16s(f, &s->intr);
 367     qemu_put_be16s(f, &s->frnum);
 368     qemu_put_be32s(f, &s->fl_base_addr);
 369     qemu_put_8s(f, &s->sof_timing);
 370     qemu_put_8s(f, &s->status2);
 371     qemu_put_timer(f, s->frame_timer);
 372 }
 373
 374 static int uhci_load(QEMUFile *f, void *opaque, int version_id)
 375 {
 376     UHCIState *s = opaque;
 377     uint8_t num_ports;
 378     int i, ret;
 379
 380     if (version_id > 1)
 381         return -EINVAL;
 382
 383     ret = pci_device_load(&s->dev, f);
 384     if (ret < 0)
 385         return ret;
 386
 387     qemu_get_8s(f, &num_ports);
 388     if (num_ports != NB_PORTS)
 389         return -EINVAL;
 390
 391     for (i = 0; i < num_ports; ++i)
 392         qemu_get_be16s(f, &s->ports[i].ctrl);
 393     qemu_get_be16s(f, &s->cmd);
 394     qemu_get_be16s(f, &s->status);
 395     qemu_get_be16s(f, &s->intr);
 396     qemu_get_be16s(f, &s->frnum);
 397     qemu_get_be32s(f, &s->fl_base_addr);
 398     qemu_get_8s(f, &s->sof_timing);
 399     qemu_get_8s(f, &s->status2);
 400     qemu_get_timer(f, s->frame_timer);
 401
 402     return 0;
 403 }
 404
 405 static void uhci_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)
 406 {
 407     UHCIState *s = opaque;
 408
 409     addr &= 0x1f;
 410     switch(addr) {
 411     case 0x0c:
 412         s->sof_timing = val;
 413         break;
 414     }
 415 }
 416
 417 static uint32_t uhci_ioport_readb(void *opaque, uint32_t addr)
 418 {
 419     UHCIState *s = opaque;
 420     uint32_t val;
 421
 422     addr &= 0x1f;
 423     switch(addr) {
 424     case 0x0c:
 425         val = s->sof_timing;
 426         break;
 427     default:
 428         val = 0xff;
 429         break;
 430     }
 431     return val;
 432 }
 433
 434 static void uhci_ioport_writew(void *opaque, uint32_t addr, uint32_t val)
 435 {
 436     UHCIState *s = opaque;
 437
 438     addr &= 0x1f;
 439     dprintf("uhci: writew port=0x%04x val=0x%04x\n", addr, val);
 440
 441     switch(addr) {
 442     case 0x00:
 443         if ((val & UHCI_CMD_RS) && !(s->cmd & UHCI_CMD_RS)) {
 444             /* start frame processing */
 445             qemu_mod_timer(s->frame_timer, qemu_get_clock(vm_clock));
 446             s->status &= ~UHCI_STS_HCHALTED;
 447         } else if (!(val & UHCI_CMD_RS)) {
 448             s->status |= UHCI_STS_HCHALTED;
 449         }
 450         if (val & UHCI_CMD_GRESET) {
 451             UHCIPort *port;
 452             USBDevice *dev;
 453             int i;
 454
 455             /* send reset on the USB bus */
 456             for(i = 0; i < NB_PORTS; i++) {
 457                 port = &s->ports[i];
 458                 dev = port->port.dev;
 459                 if (dev) {
 460                     usb_send_msg(dev, USB_MSG_RESET);
 461                 }
 462             }
 463             uhci_reset(s);
 464             return;
 465         }
 466         if (val & UHCI_CMD_HCRESET) {
 467             uhci_reset(s);
 468             return;
 469         }
 470         s->cmd = val;
 471         break;
 472     case 0x02:
 473         s->status &= ~val;
 474         /* XXX: the chip spec is not coherent, so we add a hidden
 475            register to distinguish between IOC and SPD */
 476         if (val & UHCI_STS_USBINT)
 477             s->status2 = 0;
 478         uhci_update_irq(s);
 479         break;
 480     case 0x04:
 481         s->intr = val;
 482         uhci_update_irq(s);
 483         break;
 484     case 0x06:
 485         if (s->status & UHCI_STS_HCHALTED)
 486             s->frnum = val & 0x7ff;
 487         break;
 488     case 0x10 ... 0x1f:
 489         {
 490             UHCIPort *port;
 491             USBDevice *dev;
 492             int n;
 493
 494             n = (addr >> 1) & 7;
 495             if (n >= NB_PORTS)
 496                 return;
 497             port = &s->ports[n];
 498             dev = port->port.dev;
 499             if (dev) {
 500                 /* port reset */
 501                 if ( (val & UHCI_PORT_RESET) &&
 502                      !(port->ctrl & UHCI_PORT_RESET) ) {
 503                     usb_send_msg(dev, USB_MSG_RESET);
 504                 }
 505             }
 506             port->ctrl = (port->ctrl & 0x01fb) | (val & ~0x01fb);
 507             /* some bits are reset when a '1' is written to them */
 508             port->ctrl &= ~(val & 0x000a);
 509         }
 510         break;
 511     }
 512 }
 513
 514 static uint32_t uhci_ioport_readw(void *opaque, uint32_t addr)
 515 {
 516     UHCIState *s = opaque;
 517     uint32_t val;
 518
 519     addr &= 0x1f;
 520     switch(addr) {
 521     case 0x00:
 522         val = s->cmd;
 523         break;
 524     case 0x02:
 525         val = s->status;
 526         break;
 527     case 0x04:
 528         val = s->intr;
 529         break;
 530     case 0x06:
 531         val = s->frnum;
 532         break;
 533     case 0x10 ... 0x1f:
 534         {
 535             UHCIPort *port;
 536             int n;
 537             n = (addr >> 1) & 7;
 538             if (n >= NB_PORTS)
 539                 goto read_default;
 540             port = &s->ports[n];
 541             val = port->ctrl;
 542         }
 543         break;
 544     default:
 545     read_default:
 546         val = 0xff7f; /* disabled port */
 547         break;
 548     }
 549
 550     dprintf("uhci: readw port=0x%04x val=0x%04x\n", addr, val);
 551
 552     return val;
 553 }
 554
 555 static void uhci_ioport_writel(void *opaque, uint32_t addr, uint32_t val)
 556 {
 557     UHCIState *s = opaque;
 558
 559     addr &= 0x1f;
 560     dprintf("uhci: writel port=0x%04x val=0x%08x\n", addr, val);
 561
 562     switch(addr) {
 563     case 0x08:
 564         s->fl_base_addr = val & ~0xfff;
 565         break;
 566     }
 567 }
 568
 569 static uint32_t uhci_ioport_readl(void *opaque, uint32_t addr)
 570 {
 571     UHCIState *s = opaque;
 572     uint32_t val;
 573
 574     addr &= 0x1f;
 575     switch(addr) {
 576     case 0x08:
 577         val = s->fl_base_addr;
 578         break;
 579     default:
 580         val = 0xffffffff;
 581         break;
 582     }
 583     return val;
 584 }
 585
 586 /* signal resume if controller suspended */
 587 static void uhci_resume (void *opaque)
 588 {
 589     UHCIState *s = (UHCIState *)opaque;
 590
 591     if (!s)
 592         return;
 593
 594     if (s->cmd & UHCI_CMD_EGSM) {
 595         s->cmd |= UHCI_CMD_FGR;
 596         s->status |= UHCI_STS_RD;
 597         uhci_update_irq(s);
 598     }
 599 }
 600
 601 static void uhci_attach(USBPort *port1, USBDevice *dev)
 602 {
 603     UHCIState *s = port1->opaque;
 604     UHCIPort *port = &s->ports[port1->index];
 605
 606     if (dev) {
 607         if (port->port.dev) {
 608             usb_attach(port1, NULL);
 609         }
 610         /* set connect status */
 611         port->ctrl |= UHCI_PORT_CCS | UHCI_PORT_CSC;
 612
 613         /* update speed */
 614         if (dev->speed == USB_SPEED_LOW)
 615             port->ctrl |= UHCI_PORT_LSDA;
 616         else
 617             port->ctrl &= ~UHCI_PORT_LSDA;
 618
 619         uhci_resume(s);
 620
 621         port->port.dev = dev;
 622         /* send the attach message */
 623         usb_send_msg(dev, USB_MSG_ATTACH);
 624     } else {
 625         /* set connect status */
 626         if (port->ctrl & UHCI_PORT_CCS) {
 627             port->ctrl &= ~UHCI_PORT_CCS;
 628             port->ctrl |= UHCI_PORT_CSC;
 629         }
 630         /* disable port */
 631         if (port->ctrl & UHCI_PORT_EN) {
 632             port->ctrl &= ~UHCI_PORT_EN;
 633             port->ctrl |= UHCI_PORT_ENC;
 634         }
 635
 636         uhci_resume(s);
 637
 638         dev = port->port.dev;
 639         if (dev) {
 640             /* send the detach message */
 641             usb_send_msg(dev, USB_MSG_DETACH);
 642         }
 643         port->port.dev = NULL;
 644     }
 645 }
 646
 647 static int uhci_broadcast_packet(UHCIState *s, USBPacket *p)
 648 {
 649     int i, ret;
 650
 651     dprintf("uhci: packet enter. pid %s addr 0x%02x ep %d len %d\n",
 652            pid2str(p->pid), p->devaddr, p->devep, p->len);
 653     if (p->pid == USB_TOKEN_OUT || p->pid == USB_TOKEN_SETUP)
 654         dump_data(p->data, p->len);
 655
 656     ret = USB_RET_NODEV;
 657     for (i = 0; i < NB_PORTS && ret == USB_RET_NODEV; i++) {
 658         UHCIPort *port = &s->ports[i];
 659         USBDevice *dev = port->port.dev;
 660
 661         if (dev && (port->ctrl & UHCI_PORT_EN))
 662             ret = dev->handle_packet(dev, p);
 663     }
 664
 665     dprintf("uhci: packet exit. ret %d len %d\n", ret, p->len);
 666     if (p->pid == USB_TOKEN_IN && ret > 0)
 667         dump_data(p->data, ret);
 668
 669     return ret;
 670 }
 671
 672 static void uhci_async_complete(USBPacket * packet, void *opaque);
 673 static void uhci_process_frame(UHCIState *s);
 674
 675 /* return -1 if fatal error (frame must be stopped)
 676           0 if TD successful
 677           1 if TD unsuccessful or inactive
 678 */
 679 static int uhci_complete_td(UHCIState *s, UHCI_TD *td, UHCIAsync *async, uint32_t *int_mask)
 680 {
 681     int len = 0, max_len, err, ret;
 682     uint8_t pid;
 683
 684     max_len = ((td->token >> 21) + 1) & 0x7ff;
 685     pid = td->token & 0xff;
 686
 687     ret = async->packet.len;
 688
 689     if (td->ctrl & TD_CTRL_IOC)
 690         *int_mask |= 0x01;
 691
 692     if (td->ctrl & TD_CTRL_IOS)
 693         td->ctrl &= ~TD_CTRL_ACTIVE;
 694
 695     if (ret < 0)
 696         goto out;
 697
 698     len = async->packet.len;
 699     td->ctrl = (td->ctrl & ~0x7ff) | ((len - 1) & 0x7ff);
 700
 701     /* The NAK bit may have been set by a previous frame, so clear it
 702        here.  The docs are somewhat unclear, but win2k relies on this
 703        behavior.  */
 704     td->ctrl &= ~(TD_CTRL_ACTIVE | TD_CTRL_NAK);
 705
 706     if (pid == USB_TOKEN_IN) {
 707         if (len > max_len) {
 708             len = max_len;
 709             ret = USB_RET_BABBLE;
 710             goto out;
 711         }
 712
 713         if (len > 0) {
 714             /* write the data back */
 715             cpu_physical_memory_write(td->buffer, async->buffer, len);
 716         }
 717
 718         if ((td->ctrl & TD_CTRL_SPD) && len < max_len) {
 719             *int_mask |= 0x02;
 720             /* short packet: do not update QH */
 721             dprintf("uhci: short packet. td 0x%x token 0x%x\n", async->td, async->token);
 722             return 1;
 723         }
 724     }
 725
 726     /* success */
 727     return 0;
 728
 729 out:
 730     switch(ret) {
 731     case USB_RET_STALL:
 732         td->ctrl |= TD_CTRL_STALL;
 733         td->ctrl &= ~TD_CTRL_ACTIVE;
 734         return 1;
 735
 736     case USB_RET_BABBLE:
 737         td->ctrl |= TD_CTRL_BABBLE | TD_CTRL_STALL;
 738         td->ctrl &= ~TD_CTRL_ACTIVE;
 739         /* frame interrupted */
 740         return -1;
 741
 742     case USB_RET_NAK:
 743         td->ctrl |= TD_CTRL_NAK;
 744         if (pid == USB_TOKEN_SETUP)
 745             break;
 746         return 1;
 747
 748     case USB_RET_NODEV:
 749     default:
 750         break;
 751     }
 752
 753     /* Retry the TD if error count is not zero */
 754
 755     td->ctrl |= TD_CTRL_TIMEOUT;
 756     err = (td->ctrl >> TD_CTRL_ERROR_SHIFT) & 3;
 757     if (err != 0) {
 758         err--;
 759         if (err == 0) {
 760             td->ctrl &= ~TD_CTRL_ACTIVE;
 761             s->status |= UHCI_STS_USBERR;
 762             uhci_update_irq(s);
 763         }
 764     }
 765     td->ctrl = (td->ctrl & ~(3 << TD_CTRL_ERROR_SHIFT)) |
 766         (err << TD_CTRL_ERROR_SHIFT);
 767     return 1;
 768 }
 769
 770 static int uhci_handle_td(UHCIState *s, uint32_t addr, UHCI_TD *td, uint32_t *int_mask)
 771 {
 772     UHCIAsync *async;
 773     int len = 0, max_len;
 774     uint8_t pid;
 775
 776     /* Is active ? */
 777     if (!(td->ctrl & TD_CTRL_ACTIVE))
 778         return 1;
 779
 780     async = uhci_async_find_td(s, addr, td->token);
 781     if (async) {
 782         /* Already submitted */
 783         async->valid = 32;
 784
 785         if (!async->done)
 786             return 1;
 787
 788         uhci_async_unlink(s, async);
 789         goto done;
 790     }
 791
 792     /* Allocate new packet */
 793     async = uhci_async_alloc(s);
 794     if (!async)
 795         return 1;
 796
 797     async->valid = 10;
 798     async->td    = addr;
 799     async->token = td->token;
 800
 801     max_len = ((td->token >> 21) + 1) & 0x7ff;
 802     pid = td->token & 0xff;
 803
 804     async->packet.pid     = pid;
 805     async->packet.devaddr = (td->token >> 8) & 0x7f;
 806     async->packet.devep   = (td->token >> 15) & 0xf;
 807     async->packet.data    = async->buffer;
 808     async->packet.len     = max_len;
 809     async->packet.complete_cb     = uhci_async_complete;
 810     async->packet.complete_opaque = s;
 811
 812     switch(pid) {
 813     case USB_TOKEN_OUT:
 814     case USB_TOKEN_SETUP:
 815         cpu_physical_memory_read(td->buffer, async->buffer, max_len);
 816         len = uhci_broadcast_packet(s, &async->packet);
 817         if (len >= 0)
 818             len = max_len;
 819         break;
 820
 821     case USB_TOKEN_IN:
 822         len = uhci_broadcast_packet(s, &async->packet);
 823         break;
 824
 825     default:
 826         /* invalid pid : frame interrupted */
 827         uhci_async_free(s, async);
 828         s->status |= UHCI_STS_HCPERR;
 829         uhci_update_irq(s);
 830         return -1;
 831     }
 832
 833     if (len == USB_RET_ASYNC) {
 834         uhci_async_link(s, async);
 835         return 2;
 836     }
 837
 838     async->packet.len = len;
 839
 840 done:
 841     len = uhci_complete_td(s, td, async, int_mask);
 842     uhci_async_free(s, async);
 843     return len;
 844 }
 845
 846 static void uhci_async_complete(USBPacket *packet, void *opaque)
 847 {
 848     UHCIState *s = opaque;
 849     UHCIAsync *async = (UHCIAsync *) packet;
 850
 851     dprintf("uhci: async complete. td 0x%x token 0x%x\n", async->td, async->token);
 852
 853     async->done = 1;
 854
 855     uhci_process_frame(s);
 856 }
 857
 858 static int is_valid(uint32_t link)
 859 {
 860     return (link & 1) == 0;
 861 }
 862
 863 static int is_qh(uint32_t link)
 864 {
 865     return (link & 2) != 0;
 866 }
 867
 868 static int depth_first(uint32_t link)
 869 {
 870     return (link & 4) != 0;
 871 }
 872
 873 /* QH DB used for detecting QH loops */
 874 #define UHCI_MAX_QUEUES 128
 875 typedef struct {
 876     uint32_t addr[UHCI_MAX_QUEUES];
 877     int      count;
 878 } QhDb;
 879
 880 static void qhdb_reset(QhDb *db)
 881 {
 882     db->count = 0;
 883 }
 884
 885 /* Add QH to DB. Returns 1 if already present or DB is full. */
 886 static int qhdb_insert(QhDb *db, uint32_t addr)
 887 {
 888     int i;
 889     for (i = 0; i < db->count; i++)
 890         if (db->addr[i] == addr)
 891             return 1;
 892
 893     if (db->count >= UHCI_MAX_QUEUES)
 894         return 1;
 895
 896     db->addr[db->count++] = addr;
 897     return 0;
 898 }
 899
 900 static void uhci_process_frame(UHCIState *s)
 901 {
 902     uint32_t frame_addr, link, old_td_ctrl, val, int_mask;
 903     uint32_t curr_qh;
 904     int cnt, ret;
 905     UHCI_TD td;
 906     UHCI_QH qh;
 907     QhDb qhdb;
 908
 909     frame_addr = s->fl_base_addr + ((s->frnum & 0x3ff) << 2);
 910
 911     dprintf("uhci: processing frame %d addr 0x%x\n" , s->frnum, frame_addr);
 912
 913     cpu_physical_memory_read(frame_addr, (uint8_t *)&link, 4);
 914     le32_to_cpus(&link);
 915
 916     int_mask = 0;
 917     curr_qh  = 0;
 918
 919     qhdb_reset(&qhdb);
 920
 921     for (cnt = FRAME_MAX_LOOPS; is_valid(link) && cnt; cnt--) {
 922         if (is_qh(link)) {
 923             /* QH */
 924
 925             if (qhdb_insert(&qhdb, link)) {
 926                 /*
 927                  * We're going in circles. Which is not a bug because
 928                  * HCD is allowed to do that as part of the BW management.
 929                  * In our case though it makes no sense to spin here. Sync transations
 930                  * are already done, and async completion handler will re-process
 931                  * the frame when something is ready.
 932                  */
 933                 dprintf("uhci: detected loop. qh 0x%x\n", link);
 934                 break;
 935             }
 936
 937             cpu_physical_memory_read(link & ~0xf, (uint8_t *) &qh, sizeof(qh));
 938             le32_to_cpus(&qh.link);
 939             le32_to_cpus(&qh.el_link);
 940
 941             dprintf("uhci: QH 0x%x load. link 0x%x elink 0x%x\n",
 942                     link, qh.link, qh.el_link);
 943
 944             if (!is_valid(qh.el_link)) {
 945                 /* QH w/o elements */
 946                 curr_qh = 0;
 947                 link = qh.link;
 948             } else {
 949                 /* QH with elements */
 950                 curr_qh = link;
 951                 link = qh.el_link;
 952             }
 953             continue;
 954         }
 955
 956         /* TD */
 957         cpu_physical_memory_read(link & ~0xf, (uint8_t *) &td, sizeof(td));
 958         le32_to_cpus(&td.link);
 959         le32_to_cpus(&td.ctrl);
 960         le32_to_cpus(&td.token);
 961         le32_to_cpus(&td.buffer);
 962
 963         dprintf("uhci: TD 0x%x load. link 0x%x ctrl 0x%x token 0x%x qh 0x%x\n",
 964                 link, td.link, td.ctrl, td.token, curr_qh);
 965
 966         old_td_ctrl = td.ctrl;
 967         ret = uhci_handle_td(s, link, &td, &int_mask);
 968         if (old_td_ctrl != td.ctrl) {
 969             /* update the status bits of the TD */
 970             val = cpu_to_le32(td.ctrl);
 971             cpu_physical_memory_write((link & ~0xf) + 4,
 972                                       (const uint8_t *)&val, sizeof(val));
 973         }
 974
 975         if (ret < 0) {
 976             /* interrupted frame */
 977             break;
 978         }
 979
 980         if (ret == 2 || ret == 1) {
 981             dprintf("uhci: TD 0x%x %s. link 0x%x ctrl 0x%x token 0x%x qh 0x%x\n",
 982                     link, ret == 2 ? "pend" : "skip",
 983                     td.link, td.ctrl, td.token, curr_qh);
 984
 985             link = curr_qh ? qh.link : td.link;
 986             continue;
 987         }
 988
 989         /* completed TD */
 990
 991         dprintf("uhci: TD 0x%x done. link 0x%x ctrl 0x%x token 0x%x qh 0x%x\n",
 992                 link, td.link, td.ctrl, td.token, curr_qh);
 993
 994         link = td.link;
 995
 996         if (curr_qh) {
 997             /* update QH element link */
 998             qh.el_link = link;
 999             val = cpu_to_le32(qh.el_link);
1000             cpu_physical_memory_write((curr_qh & ~0xf) + 4,
1001                                           (const uint8_t *)&val, sizeof(val));
1002
1003             if (!depth_first(link)) {
1004                /* done with this QH */
1005
1006                dprintf("uhci: QH 0x%x done. link 0x%x elink 0x%x\n",
1007                        curr_qh, qh.link, qh.el_link);
1008
1009                curr_qh = 0;
1010                link    = qh.link;
1011             }
1012         }
1013
1014         /* go to the next entry */
1015     }
1016
1017     s->pending_int_mask = int_mask;
1018 }
1019
1020 static void uhci_frame_timer(void *opaque)
1021 {
1022     UHCIState *s = opaque;
1023     int64_t expire_time;
1024
1025     if (!(s->cmd & UHCI_CMD_RS)) {
1026         /* Full stop */
1027         qemu_del_timer(s->frame_timer);
1028         /* set hchalted bit in status - UHCI11D 2.1.2 */
1029         s->status |= UHCI_STS_HCHALTED;
1030
1031         dprintf("uhci: halted\n");
1032         return;
1033     }
1034
1035     /* Complete the previous frame */
1036     if (s->pending_int_mask) {
1037         s->status2 |= s->pending_int_mask;
1038         s->status  |= UHCI_STS_USBINT;
1039         uhci_update_irq(s);
1040     }
1041
1042     /* Start new frame */
1043     s->frnum = (s->frnum + 1) & 0x7ff;
1044
1045     dprintf("uhci: new frame #%u\n" , s->frnum);
1046
1047     uhci_async_validate_begin(s);
1048
1049     uhci_process_frame(s);
1050
1051     uhci_async_validate_end(s);
1052
1053     /* prepare the timer for the next frame */
1054     expire_time = qemu_get_clock(vm_clock) +
1055         (ticks_per_sec / FRAME_TIMER_FREQ);
1056     qemu_mod_timer(s->frame_timer, expire_time);
1057 }
1058
1059 static void uhci_map(PCIDevice *pci_dev, int region_num,
1060                     uint32_t addr, uint32_t size, int type)
1061 {
1062     UHCIState *s = (UHCIState *)pci_dev;
1063
1064     register_ioport_write(addr, 32, 2, uhci_ioport_writew, s);
1065     register_ioport_read(addr, 32, 2, uhci_ioport_readw, s);
1066     register_ioport_write(addr, 32, 4, uhci_ioport_writel, s);
1067     register_ioport_read(addr, 32, 4, uhci_ioport_readl, s);
1068     register_ioport_write(addr, 32, 1, uhci_ioport_writeb, s);
1069     register_ioport_read(addr, 32, 1, uhci_ioport_readb, s);
1070 }
1071
1072 void usb_uhci_piix3_init(PCIBus *bus, int devfn)
1073 {
1074     UHCIState *s;
1075     uint8_t *pci_conf;
1076     int i;
1077
1078     s = (UHCIState *)pci_register_device(bus,
1079                                         "USB-UHCI", sizeof(UHCIState),
1080                                         devfn, NULL, NULL);
1081     pci_conf = s->dev.config;
1082     pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_INTEL);
1083     pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_INTEL_82371SB_2);
1084     pci_conf[0x08] = 0x01; // revision number
1085     pci_conf[0x09] = 0x00;
1086     pci_config_set_class(pci_conf, PCI_CLASS_SERIAL_USB);
1087     pci_conf[0x0e] = 0x00; // header_type
1088     pci_conf[0x3d] = 4; // interrupt pin 3
1089     pci_conf[0x60] = 0x10; // release number
1090
1091     for(i = 0; i < NB_PORTS; i++) {
1092         qemu_register_usb_port(&s->ports[i].port, s, i, uhci_attach);
1093     }
1094     s->frame_timer = qemu_new_timer(vm_clock, uhci_frame_timer, s);
1095
1096     uhci_reset(s);
1097
1098     /* Use region 4 for consistency with real hardware.  BSD guests seem
1099        to rely on this.  */
1100     pci_register_io_region(&s->dev, 4, 0x20,
1101                            PCI_ADDRESS_SPACE_IO, uhci_map);
1102
1103     register_savevm("uhci", 0, 1, uhci_save, uhci_load, s);
1104 }
1105
1106 void usb_uhci_piix4_init(PCIBus *bus, int devfn)
1107 {
1108     UHCIState *s;
1109     uint8_t *pci_conf;
1110     int i;
1111
1112     s = (UHCIState *)pci_register_device(bus,
1113                                         "USB-UHCI", sizeof(UHCIState),
1114                                         devfn, NULL, NULL);
1115     pci_conf = s->dev.config;
1116     pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_INTEL);
1117     pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_INTEL_82371AB_2);
1118     pci_conf[0x08] = 0x01; // revision number
1119     pci_conf[0x09] = 0x00;
1120     pci_config_set_class(pci_conf, PCI_CLASS_SERIAL_USB);
1121     pci_conf[0x0e] = 0x00; // header_type
1122     pci_conf[0x3d] = 4; // interrupt pin 3
1123     pci_conf[0x60] = 0x10; // release number
1124
1125     for(i = 0; i < NB_PORTS; i++) {
1126         qemu_register_usb_port(&s->ports[i].port, s, i, uhci_attach);
1127     }
1128     s->frame_timer = qemu_new_timer(vm_clock, uhci_frame_timer, s);
1129
1130     uhci_reset(s);
1131
1132     /* Use region 4 for consistency with real hardware.  BSD guests seem
1133        to rely on this.  */
1134     pci_register_io_region(&s->dev, 4, 0x20,
1135                            PCI_ADDRESS_SPACE_IO, uhci_map);
1136
1137     register_savevm("uhci", 0, 1, uhci_save, uhci_load, s);
1138 }