hw/etraxfs_eth.c

   1 /*
   2  * QEMU ETRAX Ethernet Controller.
   3  *
   4  * Copyright (c) 2008 Edgar E. Iglesias, Axis Communications AB.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include <stdio.h>
  26 #include "sysbus.h"
  27 #include "net/net.h"
  28 #include "etraxfs.h"
  29
  30 #define D(x)
  31
  32 /* Advertisement control register. */
  33 #define ADVERTISE_10HALF        0x0020  /* Try for 10mbps half-duplex  */
  34 #define ADVERTISE_10FULL        0x0040  /* Try for 10mbps full-duplex  */
  35 #define ADVERTISE_100HALF       0x0080  /* Try for 100mbps half-duplex */
  36 #define ADVERTISE_100FULL       0x0100  /* Try for 100mbps full-duplex */
  37
  38 /*
  39  * The MDIO extensions in the TDK PHY model were reversed engineered from the
  40  * linux driver (PHYID and Diagnostics reg).
  41  * TODO: Add friendly names for the register nums.
  42  */
  43 struct qemu_phy
  44 {
  45     uint32_t regs[32];
  46
  47     int link;
  48
  49     unsigned int (*read)(struct qemu_phy *phy, unsigned int req);
  50     void (*write)(struct qemu_phy *phy, unsigned int req, unsigned int data);
  51 };
  52
  53 static unsigned int tdk_read(struct qemu_phy *phy, unsigned int req)
  54 {
  55     int regnum;
  56     unsigned r = 0;
  57
  58     regnum = req & 0x1f;
  59
  60     switch (regnum) {
  61     case 1:
  62         if (!phy->link) {
  63             break;
  64         }
  65         /* MR1.     */
  66         /* Speeds and modes.  */
  67         r |= (1 << 13) | (1 << 14);
  68         r |= (1 << 11) | (1 << 12);
  69         r |= (1 << 5); /* Autoneg complete.  */
  70         r |= (1 << 3); /* Autoneg able.     */
  71         r |= (1 << 2); /* link.     */
  72         break;
  73     case 5:
  74         /* Link partner ability.
  75            We are kind; always agree with whatever best mode
  76            the guest advertises.  */
  77         r = 1 << 14; /* Success.  */
  78         /* Copy advertised modes.  */
  79         r |= phy->regs[4] & (15 << 5);
  80         /* Autoneg support.  */
  81         r |= 1;
  82         break;
  83     case 18:
  84     {
  85         /* Diagnostics reg.  */
  86         int duplex = 0;
  87         int speed_100 = 0;
  88
  89         if (!phy->link) {
  90             break;
  91         }
  92
  93         /* Are we advertising 100 half or 100 duplex ? */
  94         speed_100 = !!(phy->regs[4] & ADVERTISE_100HALF);
  95         speed_100 |= !!(phy->regs[4] & ADVERTISE_100FULL);
  96
  97         /* Are we advertising 10 duplex or 100 duplex ? */
  98         duplex = !!(phy->regs[4] & ADVERTISE_100FULL);
  99         duplex |= !!(phy->regs[4] & ADVERTISE_10FULL);
 100         r = (speed_100 << 10) | (duplex << 11);
 101     }
 102     break;
 103
 104     default:
 105         r = phy->regs[regnum];
 106         break;
 107     }
 108     D(printf("\n%s %x = reg[%d]\n", __func__, r, regnum));
 109     return r;
 110 }
 111
 112 static void
 113 tdk_write(struct qemu_phy *phy, unsigned int req, unsigned int data)
 114 {
 115     int regnum;
 116
 117     regnum = req & 0x1f;
 118     D(printf("%s reg[%d] = %x\n", __func__, regnum, data));
 119     switch (regnum) {
 120     default:
 121         phy->regs[regnum] = data;
 122         break;
 123     }
 124 }
 125
 126 static void
 127 tdk_init(struct qemu_phy *phy)
 128 {
 129     phy->regs[0] = 0x3100;
 130     /* PHY Id.  */
 131     phy->regs[2] = 0x0300;
 132     phy->regs[3] = 0xe400;
 133     /* Autonegotiation advertisement reg.  */
 134     phy->regs[4] = 0x01E1;
 135     phy->link = 1;
 136
 137     phy->read = tdk_read;
 138     phy->write = tdk_write;
 139 }
 140
 141 struct qemu_mdio
 142 {
 143     /* bus.     */
 144     int mdc;
 145     int mdio;
 146
 147     /* decoder.  */
 148     enum {
 149         PREAMBLE,
 150         SOF,
 151         OPC,
 152         ADDR,
 153         REQ,
 154         TURNAROUND,
 155         DATA
 156     } state;
 157     unsigned int drive;
 158
 159     unsigned int cnt;
 160     unsigned int addr;
 161     unsigned int opc;
 162     unsigned int req;
 163     unsigned int data;
 164
 165     struct qemu_phy *devs[32];
 166 };
 167
 168 static void
 169 mdio_attach(struct qemu_mdio *bus, struct qemu_phy *phy, unsigned int addr)
 170 {
 171     bus->devs[addr & 0x1f] = phy;
 172 }
 173
 174 #ifdef USE_THIS_DEAD_CODE
 175 static void
 176 mdio_detach(struct qemu_mdio *bus, struct qemu_phy *phy, unsigned int addr)
 177 {
 178     bus->devs[addr & 0x1f] = NULL;
 179 }
 180 #endif
 181
 182 static void mdio_read_req(struct qemu_mdio *bus)
 183 {
 184     struct qemu_phy *phy;
 185
 186     phy = bus->devs[bus->addr];
 187     if (phy && phy->read) {
 188         bus->data = phy->read(phy, bus->req);
 189     } else {
 190         bus->data = 0xffff;
 191     }
 192 }
 193
 194 static void mdio_write_req(struct qemu_mdio *bus)
 195 {
 196     struct qemu_phy *phy;
 197
 198     phy = bus->devs[bus->addr];
 199     if (phy && phy->write) {
 200         phy->write(phy, bus->req, bus->data);
 201     }
 202 }
 203
 204 static void mdio_cycle(struct qemu_mdio *bus)
 205 {
 206     bus->cnt++;
 207
 208     D(printf("mdc=%d mdio=%d state=%d cnt=%d drv=%d\n",
 209         bus->mdc, bus->mdio, bus->state, bus->cnt, bus->drive));
 210 #if 0
 211     if (bus->mdc) {
 212         printf("%d", bus->mdio);
 213     }
 214 #endif
 215     switch (bus->state) {
 216     case PREAMBLE:
 217         if (bus->mdc) {
 218             if (bus->cnt >= (32 * 2) && !bus->mdio) {
 219                 bus->cnt = 0;
 220                 bus->state = SOF;
 221                 bus->data = 0;
 222             }
 223         }
 224         break;
 225     case SOF:
 226         if (bus->mdc) {
 227             if (bus->mdio != 1) {
 228                 printf("WARNING: no SOF\n");
 229             }
 230             if (bus->cnt == 1*2) {
 231                 bus->cnt = 0;
 232                 bus->opc = 0;
 233                 bus->state = OPC;
 234             }
 235         }
 236         break;
 237     case OPC:
 238         if (bus->mdc) {
 239             bus->opc <<= 1;
 240             bus->opc |= bus->mdio & 1;
 241             if (bus->cnt == 2*2) {
 242                 bus->cnt = 0;
 243                 bus->addr = 0;
 244                 bus->state = ADDR;
 245             }
 246         }
 247         break;
 248     case ADDR:
 249         if (bus->mdc) {
 250             bus->addr <<= 1;
 251             bus->addr |= bus->mdio & 1;
 252
 253             if (bus->cnt == 5*2) {
 254                 bus->cnt = 0;
 255                 bus->req = 0;
 256                 bus->state = REQ;
 257             }
 258         }
 259         break;
 260     case REQ:
 261         if (bus->mdc) {
 262             bus->req <<= 1;
 263             bus->req |= bus->mdio & 1;
 264             if (bus->cnt == 5*2) {
 265                 bus->cnt = 0;
 266                 bus->state = TURNAROUND;
 267             }
 268         }
 269         break;
 270     case TURNAROUND:
 271         if (bus->mdc && bus->cnt == 2*2) {
 272             bus->mdio = 0;
 273             bus->cnt = 0;
 274
 275             if (bus->opc == 2) {
 276                 bus->drive = 1;
 277                 mdio_read_req(bus);
 278                 bus->mdio = bus->data & 1;
 279             }
 280             bus->state = DATA;
 281         }
 282         break;
 283     case DATA:
 284         if (!bus->mdc) {
 285             if (bus->drive) {
 286                 bus->mdio = !!(bus->data & (1 << 15));
 287                 bus->data <<= 1;
 288             }
 289         } else {
 290             if (!bus->drive) {
 291                 bus->data <<= 1;
 292                 bus->data |= bus->mdio;
 293             }
 294             if (bus->cnt == 16 * 2) {
 295                 bus->cnt = 0;
 296                 bus->state = PREAMBLE;
 297                 if (!bus->drive) {
 298                     mdio_write_req(bus);
 299                 }
 300                 bus->drive = 0;
 301             }
 302         }
 303         break;
 304     default:
 305         break;
 306     }
 307 }
 308
 309 /* ETRAX-FS Ethernet MAC block starts here.  */
 310
 311 #define RW_MA0_LO      0x00
 312 #define RW_MA0_HI      0x01
 313 #define RW_MA1_LO      0x02
 314 #define RW_MA1_HI      0x03
 315 #define RW_GA_LO      0x04
 316 #define RW_GA_HI      0x05
 317 #define RW_GEN_CTRL      0x06
 318 #define RW_REC_CTRL      0x07
 319 #define RW_TR_CTRL      0x08
 320 #define RW_CLR_ERR      0x09
 321 #define RW_MGM_CTRL      0x0a
 322 #define R_STAT          0x0b
 323 #define FS_ETH_MAX_REGS      0x17
 324
 325 struct fs_eth
 326 {
 327     SysBusDevice busdev;
 328     MemoryRegion mmio;
 329     NICState *nic;
 330     NICConf conf;
 331
 332     /* Two addrs in the filter.  */
 333     uint8_t macaddr[2][6];
 334     uint32_t regs[FS_ETH_MAX_REGS];
 335
 336     union {
 337         void *vdma_out;
 338         struct etraxfs_dma_client *dma_out;
 339     };
 340     union {
 341         void *vdma_in;
 342         struct etraxfs_dma_client *dma_in;
 343     };
 344
 345     /* MDIO bus.  */
 346     struct qemu_mdio mdio_bus;
 347     unsigned int phyaddr;
 348     int duplex_mismatch;
 349
 350     /* PHY.     */
 351     struct qemu_phy phy;
 352 };
 353
 354 static void eth_validate_duplex(struct fs_eth *eth)
 355 {
 356     struct qemu_phy *phy;
 357     unsigned int phy_duplex;
 358     unsigned int mac_duplex;
 359     int new_mm = 0;
 360
 361     phy = eth->mdio_bus.devs[eth->phyaddr];
 362     phy_duplex = !!(phy->read(phy, 18) & (1 << 11));
 363     mac_duplex = !!(eth->regs[RW_REC_CTRL] & 128);
 364
 365     if (mac_duplex != phy_duplex) {
 366         new_mm = 1;
 367     }
 368
 369     if (eth->regs[RW_GEN_CTRL] & 1) {
 370         if (new_mm != eth->duplex_mismatch) {
 371             if (new_mm) {
 372                 printf("HW: WARNING ETH duplex mismatch MAC=%d PHY=%d\n",
 373                        mac_duplex, phy_duplex);
 374             } else {
 375                 printf("HW: ETH duplex ok.\n");
 376             }
 377         }
 378         eth->duplex_mismatch = new_mm;
 379     }
 380 }
 381
 382 static uint64_t
 383 eth_read(void *opaque, hwaddr addr, unsigned int size)
 384 {
 385     struct fs_eth *eth = opaque;
 386     uint32_t r = 0;
 387
 388     addr >>= 2;
 389
 390     switch (addr) {
 391     case R_STAT:
 392         r = eth->mdio_bus.mdio & 1;
 393         break;
 394     default:
 395         r = eth->regs[addr];
 396         D(printf("%s %x\n", __func__, addr * 4));
 397         break;
 398     }
 399     return r;
 400 }
 401
 402 static void eth_update_ma(struct fs_eth *eth, int ma)
 403 {
 404     int reg;
 405     int i = 0;
 406
 407     ma &= 1;
 408
 409     reg = RW_MA0_LO;
 410     if (ma) {
 411         reg = RW_MA1_LO;
 412     }
 413
 414     eth->macaddr[ma][i++] = eth->regs[reg];
 415     eth->macaddr[ma][i++] = eth->regs[reg] >> 8;
 416     eth->macaddr[ma][i++] = eth->regs[reg] >> 16;
 417     eth->macaddr[ma][i++] = eth->regs[reg] >> 24;
 418     eth->macaddr[ma][i++] = eth->regs[reg + 1];
 419     eth->macaddr[ma][i] = eth->regs[reg + 1] >> 8;
 420
 421     D(printf("set mac%d=%x.%x.%x.%x.%x.%x\n", ma,
 422              eth->macaddr[ma][0], eth->macaddr[ma][1],
 423              eth->macaddr[ma][2], eth->macaddr[ma][3],
 424              eth->macaddr[ma][4], eth->macaddr[ma][5]));
 425 }
 426
 427 static void
 428 eth_write(void *opaque, hwaddr addr,
 429           uint64_t val64, unsigned int size)
 430 {
 431     struct fs_eth *eth = opaque;
 432     uint32_t value = val64;
 433
 434     addr >>= 2;
 435     switch (addr) {
 436     case RW_MA0_LO:
 437     case RW_MA0_HI:
 438         eth->regs[addr] = value;
 439         eth_update_ma(eth, 0);
 440         break;
 441     case RW_MA1_LO:
 442     case RW_MA1_HI:
 443         eth->regs[addr] = value;
 444         eth_update_ma(eth, 1);
 445         break;
 446
 447     case RW_MGM_CTRL:
 448         /* Attach an MDIO/PHY abstraction.  */
 449         if (value & 2) {
 450             eth->mdio_bus.mdio = value & 1;
 451         }
 452         if (eth->mdio_bus.mdc != (value & 4)) {
 453             mdio_cycle(&eth->mdio_bus);
 454             eth_validate_duplex(eth);
 455         }
 456         eth->mdio_bus.mdc = !!(value & 4);
 457         eth->regs[addr] = value;
 458         break;
 459
 460     case RW_REC_CTRL:
 461         eth->regs[addr] = value;
 462         eth_validate_duplex(eth);
 463         break;
 464
 465     default:
 466         eth->regs[addr] = value;
 467         D(printf("%s %x %x\n", __func__, addr, value));
 468         break;
 469     }
 470 }
 471
 472 /* The ETRAX FS has a groupt address table (GAT) which works like a k=1 bloom
 473    filter dropping group addresses we have not joined.    The filter has 64
 474    bits (m). The has function is a simple nible xor of the group addr.    */
 475 static int eth_match_groupaddr(struct fs_eth *eth, const unsigned char *sa)
 476 {
 477     unsigned int hsh;
 478     int m_individual = eth->regs[RW_REC_CTRL] & 4;
 479     int match;
 480
 481     /* First bit on the wire of a MAC address signals multicast or
 482        physical address.  */
 483     if (!m_individual && !(sa[0] & 1)) {
 484         return 0;
 485     }
 486
 487     /* Calculate the hash index for the GA registers. */
 488     hsh = 0;
 489     hsh ^= (*sa) & 0x3f;
 490     hsh ^= ((*sa) >> 6) & 0x03;
 491     ++sa;
 492     hsh ^= ((*sa) << 2) & 0x03c;
 493     hsh ^= ((*sa) >> 4) & 0xf;
 494     ++sa;
 495     hsh ^= ((*sa) << 4) & 0x30;
 496     hsh ^= ((*sa) >> 2) & 0x3f;
 497     ++sa;
 498     hsh ^= (*sa) & 0x3f;
 499     hsh ^= ((*sa) >> 6) & 0x03;
 500     ++sa;
 501     hsh ^= ((*sa) << 2) & 0x03c;
 502     hsh ^= ((*sa) >> 4) & 0xf;
 503     ++sa;
 504     hsh ^= ((*sa) << 4) & 0x30;
 505     hsh ^= ((*sa) >> 2) & 0x3f;
 506
 507     hsh &= 63;
 508     if (hsh > 31) {
 509         match = eth->regs[RW_GA_HI] & (1 << (hsh - 32));
 510     } else {
 511         match = eth->regs[RW_GA_LO] & (1 << hsh);
 512     }
 513     D(printf("hsh=%x ga=%x.%x mtch=%d\n", hsh,
 514              eth->regs[RW_GA_HI], eth->regs[RW_GA_LO], match));
 515     return match;
 516 }
 517
 518 static int eth_can_receive(NetClientState *nc)
 519 {
 520     return 1;
 521 }
 522
 523 static ssize_t eth_receive(NetClientState *nc, const uint8_t *buf, size_t size)
 524 {
 525     unsigned char sa_bcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 526     struct fs_eth *eth = qemu_get_nic_opaque(nc);
 527     int use_ma0 = eth->regs[RW_REC_CTRL] & 1;
 528     int use_ma1 = eth->regs[RW_REC_CTRL] & 2;
 529     int r_bcast = eth->regs[RW_REC_CTRL] & 8;
 530
 531     if (size < 12) {
 532         return -1;
 533     }
 534
 535     D(printf("%x.%x.%x.%x.%x.%x ma=%d %d bc=%d\n",
 536          buf[0], buf[1], buf[2], buf[3], buf[4], buf[5],
 537          use_ma0, use_ma1, r_bcast));
 538
 539     /* Does the frame get through the address filters?  */
 540     if ((!use_ma0 || memcmp(buf, eth->macaddr[0], 6))
 541         && (!use_ma1 || memcmp(buf, eth->macaddr[1], 6))
 542         && (!r_bcast || memcmp(buf, sa_bcast, 6))
 543         && !eth_match_groupaddr(eth, buf)) {
 544         return size;
 545     }
 546
 547     /* FIXME: Find another way to pass on the fake csum.  */
 548     etraxfs_dmac_input(eth->dma_in, (void *)buf, size + 4, 1);
 549
 550         return size;
 551 }
 552
 553 static int eth_tx_push(void *opaque, unsigned char *buf, int len, bool eop)
 554 {
 555     struct fs_eth *eth = opaque;
 556
 557     D(printf("%s buf=%p len=%d\n", __func__, buf, len));
 558     qemu_send_packet(qemu_get_queue(eth->nic), buf, len);
 559     return len;
 560 }
 561
 562 static void eth_set_link(NetClientState *nc)
 563 {
 564     struct fs_eth *eth = qemu_get_nic_opaque(nc);
 565     D(printf("%s %d\n", __func__, nc->link_down));
 566     eth->phy.link = !nc->link_down;
 567 }
 568
 569 static const MemoryRegionOps eth_ops = {
 570     .read = eth_read,
 571     .write = eth_write,
 572     .endianness = DEVICE_LITTLE_ENDIAN,
 573     .valid = {
 574         .min_access_size = 4,
 575         .max_access_size = 4
 576     }
 577 };
 578
 579 static void eth_cleanup(NetClientState *nc)
 580 {
 581     struct fs_eth *eth = qemu_get_nic_opaque(nc);
 582
 583     /* Disconnect the client.  */
 584     eth->dma_out->client.push = NULL;
 585     eth->dma_out->client.opaque = NULL;
 586     eth->dma_in->client.opaque = NULL;
 587     eth->dma_in->client.pull = NULL;
 588         g_free(eth);
 589 }
 590
 591 static NetClientInfo net_etraxfs_info = {
 592     .type = NET_CLIENT_OPTIONS_KIND_NIC,
 593     .size = sizeof(NICState),
 594     .can_receive = eth_can_receive,
 595     .receive = eth_receive,
 596     .cleanup = eth_cleanup,
 597     .link_status_changed = eth_set_link,
 598 };
 599
 600 static int fs_eth_init(SysBusDevice *dev)
 601 {
 602     struct fs_eth *s = FROM_SYSBUS(typeof(*s), dev);
 603
 604     if (!s->dma_out || !s->dma_in) {
 605         hw_error("Unconnected ETRAX-FS Ethernet MAC.\n");
 606     }
 607
 608     s->dma_out->client.push = eth_tx_push;
 609     s->dma_out->client.opaque = s;
 610     s->dma_in->client.opaque = s;
 611     s->dma_in->client.pull = NULL;
 612
 613     memory_region_init_io(&s->mmio, &eth_ops, s, "etraxfs-eth", 0x5c);
 614     sysbus_init_mmio(dev, &s->mmio);
 615
 616     qemu_macaddr_default_if_unset(&s->conf.macaddr);
 617     s->nic = qemu_new_nic(&net_etraxfs_info, &s->conf,
 618                           object_get_typename(OBJECT(s)), dev->qdev.id, s);
 619     qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
 620
 621
 622     tdk_init(&s->phy);
 623     mdio_attach(&s->mdio_bus, &s->phy, s->phyaddr);
 624     return 0;
 625 }
 626
 627 static Property etraxfs_eth_properties[] = {
 628     DEFINE_PROP_UINT32("phyaddr", struct fs_eth, phyaddr, 1),
 629     DEFINE_PROP_PTR("dma_out", struct fs_eth, vdma_out),
 630     DEFINE_PROP_PTR("dma_in", struct fs_eth, vdma_in),
 631     DEFINE_NIC_PROPERTIES(struct fs_eth, conf),
 632     DEFINE_PROP_END_OF_LIST(),
 633 };
 634
 635 static void etraxfs_eth_class_init(ObjectClass *klass, void *data)
 636 {
 637     DeviceClass *dc = DEVICE_CLASS(klass);
 638     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 639
 640     k->init = fs_eth_init;
 641     dc->props = etraxfs_eth_properties;
 642 }
 643
 644 static const TypeInfo etraxfs_eth_info = {
 645     .name          = "etraxfs-eth",
 646     .parent        = TYPE_SYS_BUS_DEVICE,
 647     .instance_size = sizeof(struct fs_eth),
 648     .class_init    = etraxfs_eth_class_init,
 649 };
 650
 651 static void etraxfs_eth_register_types(void)
 652 {
 653     type_register_static(&etraxfs_eth_info);
 654 }
 655
 656 type_init(etraxfs_eth_register_types)