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 "hw.h"
  27 #include "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,
  51                       unsigned int data);
  52 };
  53
  54 static unsigned int tdk_read(struct qemu_phy *phy, unsigned int req)
  55 {
  56         int regnum;
  57         unsigned r = 0;
  58
  59         regnum = req & 0x1f;
  60
  61         switch (regnum) {
  62                 case 1:
  63                         if (!phy->link)
  64                                 break;
  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                         /* Are we advertising 100 half or 100 duplex ? */
  93                         speed_100 = !!(phy->regs[4] & ADVERTISE_100HALF);
  94                         speed_100 |= !!(phy->regs[4] & ADVERTISE_100FULL);
  95
  96                         /* Are we advertising 10 duplex or 100 duplex ? */
  97                         duplex = !!(phy->regs[4] & ADVERTISE_100FULL);
  98                         duplex |= !!(phy->regs[4] & ADVERTISE_10FULL);
  99                         r = (speed_100 << 10) | (duplex << 11);
 100                 }
 101                 break;
 102
 103                 default:
 104                         r = phy->regs[regnum];
 105                         break;
 106         }
 107         D(printf("\n%s %x = reg[%d]\n", __func__, r, regnum));
 108         return r;
 109 }
 110
 111 static void
 112 tdk_write(struct qemu_phy *phy, unsigned int req, unsigned int data)
 113 {
 114         int regnum;
 115
 116         regnum = req & 0x1f;
 117         D(printf("%s reg[%d] = %x\n", __func__, regnum, data));
 118         switch (regnum) {
 119                 default:
 120                         phy->regs[regnum] = data;
 121                         break;
 122         }
 123 }
 124
 125 static void
 126 tdk_init(struct qemu_phy *phy)
 127 {
 128         phy->regs[0] = 0x3100;
 129         /* PHY Id.  */
 130         phy->regs[2] = 0x0300;
 131         phy->regs[3] = 0xe400;
 132         /* Autonegotiation advertisement reg.  */
 133         phy->regs[4] = 0x01E1;
 134         phy->link = 1;
 135
 136         phy->read = tdk_read;
 137         phy->write = tdk_write;
 138 }
 139
 140 struct qemu_mdio
 141 {
 142         /* bus.  */
 143         int mdc;
 144         int mdio;
 145
 146         /* decoder.  */
 147         enum {
 148                 PREAMBLE,
 149                 SOF,
 150                 OPC,
 151                 ADDR,
 152                 REQ,
 153                 TURNAROUND,
 154                 DATA
 155         } state;
 156         unsigned int drive;
 157
 158         unsigned int cnt;
 159         unsigned int addr;
 160         unsigned int opc;
 161         unsigned int req;
 162         unsigned int data;
 163
 164         struct qemu_phy *devs[32];
 165 };
 166
 167 static void
 168 mdio_attach(struct qemu_mdio *bus, struct qemu_phy *phy, unsigned int addr)
 169 {
 170         bus->devs[addr & 0x1f] = phy;
 171 }
 172
 173 #ifdef USE_THIS_DEAD_CODE
 174 static void
 175 mdio_detach(struct qemu_mdio *bus, struct qemu_phy *phy, unsigned int addr)
 176 {
 177         bus->devs[addr & 0x1f] = NULL;
 178 }
 179 #endif
 180
 181 static void mdio_read_req(struct qemu_mdio *bus)
 182 {
 183         struct qemu_phy *phy;
 184
 185         phy = bus->devs[bus->addr];
 186         if (phy && phy->read)
 187                 bus->data = phy->read(phy, bus->req);
 188         else
 189                 bus->data = 0xffff;
 190 }
 191
 192 static void mdio_write_req(struct qemu_mdio *bus)
 193 {
 194         struct qemu_phy *phy;
 195
 196         phy = bus->devs[bus->addr];
 197         if (phy && phy->write)
 198                 phy->write(phy, bus->req, bus->data);
 199 }
 200
 201 static void mdio_cycle(struct qemu_mdio *bus)
 202 {
 203         bus->cnt++;
 204
 205         D(printf("mdc=%d mdio=%d state=%d cnt=%d drv=%d\n",
 206                 bus->mdc, bus->mdio, bus->state, bus->cnt, bus->drive));
 207 #if 0
 208         if (bus->mdc)
 209                 printf("%d", bus->mdio);
 210 #endif
 211         switch (bus->state)
 212         {
 213                 case PREAMBLE:
 214                         if (bus->mdc) {
 215                                 if (bus->cnt >= (32 * 2) && !bus->mdio) {
 216                                         bus->cnt = 0;
 217                                         bus->state = SOF;
 218                                         bus->data = 0;
 219                                 }
 220                         }
 221                         break;
 222                 case SOF:
 223                         if (bus->mdc) {
 224                                 if (bus->mdio != 1)
 225                                         printf("WARNING: no SOF\n");
 226                                 if (bus->cnt == 1*2) {
 227                                         bus->cnt = 0;
 228                                         bus->opc = 0;
 229                                         bus->state = OPC;
 230                                 }
 231                         }
 232                         break;
 233                 case OPC:
 234                         if (bus->mdc) {
 235                                 bus->opc <<= 1;
 236                                 bus->opc |= bus->mdio & 1;
 237                                 if (bus->cnt == 2*2) {
 238                                         bus->cnt = 0;
 239                                         bus->addr = 0;
 240                                         bus->state = ADDR;
 241                                 }
 242                         }
 243                         break;
 244                 case ADDR:
 245                         if (bus->mdc) {
 246                                 bus->addr <<= 1;
 247                                 bus->addr |= bus->mdio & 1;
 248
 249                                 if (bus->cnt == 5*2) {
 250                                         bus->cnt = 0;
 251                                         bus->req = 0;
 252                                         bus->state = REQ;
 253                                 }
 254                         }
 255                         break;
 256                 case REQ:
 257                         if (bus->mdc) {
 258                                 bus->req <<= 1;
 259                                 bus->req |= bus->mdio & 1;
 260                                 if (bus->cnt == 5*2) {
 261                                         bus->cnt = 0;
 262                                         bus->state = TURNAROUND;
 263                                 }
 264                         }
 265                         break;
 266                 case TURNAROUND:
 267                         if (bus->mdc && bus->cnt == 2*2) {
 268                                 bus->mdio = 0;
 269                                 bus->cnt = 0;
 270
 271                                 if (bus->opc == 2) {
 272                                         bus->drive = 1;
 273                                         mdio_read_req(bus);
 274                                         bus->mdio = bus->data & 1;
 275                                 }
 276                                 bus->state = DATA;
 277                         }
 278                         break;
 279                 case DATA:
 280                         if (!bus->mdc) {
 281                                 if (bus->drive) {
 282                                         bus->mdio = !!(bus->data & (1 << 15));
 283                                         bus->data <<= 1;
 284                                 }
 285                         } else {
 286                                 if (!bus->drive) {
 287                                         bus->data <<= 1;
 288                                         bus->data |= bus->mdio;
 289                                 }
 290                                 if (bus->cnt == 16 * 2) {
 291                                         bus->cnt = 0;
 292                                         bus->state = PREAMBLE;
 293                                         if (!bus->drive)
 294                                                 mdio_write_req(bus);
 295                                         bus->drive = 0;
 296                                 }
 297                         }
 298                         break;
 299                 default:
 300                         break;
 301         }
 302 }
 303
 304 /* ETRAX-FS Ethernet MAC block starts here.  */
 305
 306 #define RW_MA0_LO         0x00
 307 #define RW_MA0_HI         0x01
 308 #define RW_MA1_LO         0x02
 309 #define RW_MA1_HI         0x03
 310 #define RW_GA_LO          0x04
 311 #define RW_GA_HI          0x05
 312 #define RW_GEN_CTRL       0x06
 313 #define RW_REC_CTRL       0x07
 314 #define RW_TR_CTRL        0x08
 315 #define RW_CLR_ERR        0x09
 316 #define RW_MGM_CTRL       0x0a
 317 #define R_STAT            0x0b
 318 #define FS_ETH_MAX_REGS   0x17
 319
 320 struct fs_eth
 321 {
 322         CPUState *env;
 323         qemu_irq *irq;
 324         VLANClientState *vc;
 325         int ethregs;
 326
 327         /* Two addrs in the filter.  */
 328         uint8_t macaddr[2][6];
 329         uint32_t regs[FS_ETH_MAX_REGS];
 330
 331         struct etraxfs_dma_client *dma_out;
 332         struct etraxfs_dma_client *dma_in;
 333
 334         /* MDIO bus.  */
 335         struct qemu_mdio mdio_bus;
 336         unsigned int phyaddr;
 337         int duplex_mismatch;
 338
 339         /* PHY.  */
 340         struct qemu_phy phy;
 341 };
 342
 343 static void eth_validate_duplex(struct fs_eth *eth)
 344 {
 345         struct qemu_phy *phy;
 346         unsigned int phy_duplex;
 347         unsigned int mac_duplex;
 348         int new_mm = 0;
 349
 350         phy = eth->mdio_bus.devs[eth->phyaddr];
 351         phy_duplex = !!(phy->read(phy, 18) & (1 << 11));
 352         mac_duplex = !!(eth->regs[RW_REC_CTRL] & 128);
 353
 354         if (mac_duplex != phy_duplex)
 355                 new_mm = 1;
 356
 357         if (eth->regs[RW_GEN_CTRL] & 1) {
 358                 if (new_mm != eth->duplex_mismatch) {
 359                         if (new_mm)
 360                                 printf("HW: WARNING "
 361                                        "ETH duplex mismatch MAC=%d PHY=%d\n",
 362                                        mac_duplex, phy_duplex);
 363                         else
 364                                 printf("HW: ETH duplex ok.\n");
 365                 }
 366                 eth->duplex_mismatch = new_mm;
 367         }
 368 }
 369
 370 static uint32_t eth_readl (void *opaque, target_phys_addr_t addr)
 371 {
 372         struct fs_eth *eth = opaque;
 373         uint32_t r = 0;
 374
 375         addr >>= 2;
 376
 377         switch (addr) {
 378                 case R_STAT:
 379                         r = eth->mdio_bus.mdio & 1;
 380                         break;
 381         default:
 382                 r = eth->regs[addr];
 383                 D(printf ("%s %x\n", __func__, addr * 4));
 384                 break;
 385         }
 386         return r;
 387 }
 388
 389 static void eth_update_ma(struct fs_eth *eth, int ma)
 390 {
 391         int reg;
 392         int i = 0;
 393
 394         ma &= 1;
 395
 396         reg = RW_MA0_LO;
 397         if (ma)
 398                 reg = RW_MA1_LO;
 399
 400         eth->macaddr[ma][i++] = eth->regs[reg];
 401         eth->macaddr[ma][i++] = eth->regs[reg] >> 8;
 402         eth->macaddr[ma][i++] = eth->regs[reg] >> 16;
 403         eth->macaddr[ma][i++] = eth->regs[reg] >> 24;
 404         eth->macaddr[ma][i++] = eth->regs[reg + 4];
 405         eth->macaddr[ma][i++] = eth->regs[reg + 4] >> 8;
 406
 407         D(printf("set mac%d=%x.%x.%x.%x.%x.%x\n", ma,
 408                  eth->macaddr[ma][0], eth->macaddr[ma][1],
 409                  eth->macaddr[ma][2], eth->macaddr[ma][3],
 410                  eth->macaddr[ma][4], eth->macaddr[ma][5]));
 411 }
 412
 413 static void
 414 eth_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
 415 {
 416         struct fs_eth *eth = opaque;
 417
 418         addr >>= 2;
 419         switch (addr)
 420         {
 421                 case RW_MA0_LO:
 422                 case RW_MA0_HI:
 423                         eth->regs[addr] = value;
 424                         eth_update_ma(eth, 0);
 425                         break;
 426                 case RW_MA1_LO:
 427                 case RW_MA1_HI:
 428                         eth->regs[addr] = value;
 429                         eth_update_ma(eth, 1);
 430                         break;
 431
 432                 case RW_MGM_CTRL:
 433                         /* Attach an MDIO/PHY abstraction.  */
 434                         if (value & 2)
 435                                 eth->mdio_bus.mdio = value & 1;
 436                         if (eth->mdio_bus.mdc != (value & 4)) {
 437                                 mdio_cycle(&eth->mdio_bus);
 438                                 eth_validate_duplex(eth);
 439                         }
 440                         eth->mdio_bus.mdc = !!(value & 4);
 441                         break;
 442
 443                 case RW_REC_CTRL:
 444                         eth->regs[addr] = value;
 445                         eth_validate_duplex(eth);
 446                         break;
 447
 448                 default:
 449                         eth->regs[addr] = value;
 450                         D(printf ("%s %x %x\n",
 451                                   __func__, addr, value));
 452                         break;
 453         }
 454 }
 455
 456 /* The ETRAX FS has a groupt address table (GAT) which works like a k=1 bloom
 457    filter dropping group addresses we have not joined.  The filter has 64
 458    bits (m). The has function is a simple nible xor of the group addr.  */
 459 static int eth_match_groupaddr(struct fs_eth *eth, const unsigned char *sa)
 460 {
 461         unsigned int hsh;
 462         int m_individual = eth->regs[RW_REC_CTRL] & 4;
 463         int match;
 464
 465         /* First bit on the wire of a MAC address signals multicast or
 466            physical address.  */
 467         if (!m_individual && !sa[0] & 1)
 468                 return 0;
 469
 470         /* Calculate the hash index for the GA registers. */
 471         hsh = 0;
 472         hsh ^= (*sa) & 0x3f;
 473         hsh ^= ((*sa) >> 6) & 0x03;
 474         ++sa;
 475         hsh ^= ((*sa) << 2) & 0x03c;
 476         hsh ^= ((*sa) >> 4) & 0xf;
 477         ++sa;
 478         hsh ^= ((*sa) << 4) & 0x30;
 479         hsh ^= ((*sa) >> 2) & 0x3f;
 480         ++sa;
 481         hsh ^= (*sa) & 0x3f;
 482         hsh ^= ((*sa) >> 6) & 0x03;
 483         ++sa;
 484         hsh ^= ((*sa) << 2) & 0x03c;
 485         hsh ^= ((*sa) >> 4) & 0xf;
 486         ++sa;
 487         hsh ^= ((*sa) << 4) & 0x30;
 488         hsh ^= ((*sa) >> 2) & 0x3f;
 489
 490         hsh &= 63;
 491         if (hsh > 31)
 492                 match = eth->regs[RW_GA_HI] & (1 << (hsh - 32));
 493         else
 494                 match = eth->regs[RW_GA_LO] & (1 << hsh);
 495         D(printf("hsh=%x ga=%x.%x mtch=%d\n", hsh,
 496                  eth->regs[RW_GA_HI], eth->regs[RW_GA_LO], match));
 497         return match;
 498 }
 499
 500 static int eth_can_receive(void *opaque)
 501 {
 502         return 1;
 503 }
 504
 505 static void eth_receive(void *opaque, const uint8_t *buf, int size)
 506 {
 507         unsigned char sa_bcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 508         struct fs_eth *eth = opaque;
 509         int use_ma0 = eth->regs[RW_REC_CTRL] & 1;
 510         int use_ma1 = eth->regs[RW_REC_CTRL] & 2;
 511         int r_bcast = eth->regs[RW_REC_CTRL] & 8;
 512
 513         if (size < 12)
 514                 return;
 515
 516         D(printf("%x.%x.%x.%x.%x.%x ma=%d %d bc=%d\n",
 517                  buf[0], buf[1], buf[2], buf[3], buf[4], buf[5],
 518                  use_ma0, use_ma1, r_bcast));
 519
 520         /* Does the frame get through the address filters?  */
 521         if ((!use_ma0 || memcmp(buf, eth->macaddr[0], 6))
 522             && (!use_ma1 || memcmp(buf, eth->macaddr[1], 6))
 523             && (!r_bcast || memcmp(buf, sa_bcast, 6))
 524             && !eth_match_groupaddr(eth, buf))
 525                 return;
 526
 527         /* FIXME: Find another way to pass on the fake csum.  */
 528         etraxfs_dmac_input(eth->dma_in, (void *)buf, size + 4, 1);
 529 }
 530
 531 static int eth_tx_push(void *opaque, unsigned char *buf, int len)
 532 {
 533         struct fs_eth *eth = opaque;
 534
 535         D(printf("%s buf=%p len=%d\n", __func__, buf, len));
 536         qemu_send_packet(eth->vc, buf, len);
 537         return len;
 538 }
 539
 540 static void eth_set_link(VLANClientState *vc)
 541 {
 542         struct fs_eth *eth = vc->opaque;
 543         D(printf("%s %d\n", __func__, vc->link_down));
 544         eth->phy.link = !vc->link_down;
 545 }
 546
 547 static CPUReadMemoryFunc *eth_read[] = {
 548         NULL, NULL,
 549         &eth_readl,
 550 };
 551
 552 static CPUWriteMemoryFunc *eth_write[] = {
 553         NULL, NULL,
 554         &eth_writel,
 555 };
 556
 557 static void eth_cleanup(VLANClientState *vc)
 558 {
 559         struct fs_eth *eth = vc->opaque;
 560
 561         cpu_unregister_io_memory(eth->ethregs);
 562
 563         qemu_free(eth->dma_out);
 564         qemu_free(eth);
 565 }
 566
 567 void *etraxfs_eth_init(NICInfo *nd, CPUState *env,
 568                        qemu_irq *irq, target_phys_addr_t base, int phyaddr)
 569 {
 570         struct etraxfs_dma_client *dma = NULL;
 571         struct fs_eth *eth = NULL;
 572
 573         qemu_check_nic_model(nd, "fseth");
 574
 575         dma = qemu_mallocz(sizeof *dma * 2);
 576
 577         eth = qemu_mallocz(sizeof *eth);
 578
 579         dma[0].client.push = eth_tx_push;
 580         dma[0].client.opaque = eth;
 581         dma[1].client.opaque = eth;
 582         dma[1].client.pull = NULL;
 583
 584         eth->env = env;
 585         eth->irq = irq;
 586         eth->dma_out = dma;
 587         eth->dma_in = dma + 1;
 588
 589         /* Connect the phy.  */
 590         eth->phyaddr = phyaddr & 0x1f;
 591         tdk_init(&eth->phy);
 592         mdio_attach(&eth->mdio_bus, &eth->phy, eth->phyaddr);
 593
 594         eth->ethregs = cpu_register_io_memory(0, eth_read, eth_write, eth);
 595         cpu_register_physical_memory (base, 0x5c, eth->ethregs);
 596
 597         eth->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name,
 598                                        eth_receive, eth_can_receive,
 599                                        eth_cleanup, eth);
 600         eth->vc->opaque = eth;
 601         eth->vc->link_status_changed = eth_set_link;
 602
 603         return dma;
 604 }