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         VLANClientState *vc;
 323         int ethregs;
 324
 325         /* Two addrs in the filter.  */
 326         uint8_t macaddr[2][6];
 327         uint32_t regs[FS_ETH_MAX_REGS];
 328
 329         struct etraxfs_dma_client *dma_out;
 330         struct etraxfs_dma_client *dma_in;
 331
 332         /* MDIO bus.  */
 333         struct qemu_mdio mdio_bus;
 334         unsigned int phyaddr;
 335         int duplex_mismatch;
 336
 337         /* PHY.  */
 338         struct qemu_phy phy;
 339 };
 340
 341 static void eth_validate_duplex(struct fs_eth *eth)
 342 {
 343         struct qemu_phy *phy;
 344         unsigned int phy_duplex;
 345         unsigned int mac_duplex;
 346         int new_mm = 0;
 347
 348         phy = eth->mdio_bus.devs[eth->phyaddr];
 349         phy_duplex = !!(phy->read(phy, 18) & (1 << 11));
 350         mac_duplex = !!(eth->regs[RW_REC_CTRL] & 128);
 351
 352         if (mac_duplex != phy_duplex)
 353                 new_mm = 1;
 354
 355         if (eth->regs[RW_GEN_CTRL] & 1) {
 356                 if (new_mm != eth->duplex_mismatch) {
 357                         if (new_mm)
 358                                 printf("HW: WARNING "
 359                                        "ETH duplex mismatch MAC=%d PHY=%d\n",
 360                                        mac_duplex, phy_duplex);
 361                         else
 362                                 printf("HW: ETH duplex ok.\n");
 363                 }
 364                 eth->duplex_mismatch = new_mm;
 365         }
 366 }
 367
 368 static uint32_t eth_readl (void *opaque, a_target_phys_addr addr)
 369 {
 370         struct fs_eth *eth = opaque;
 371         uint32_t r = 0;
 372
 373         addr >>= 2;
 374
 375         switch (addr) {
 376                 case R_STAT:
 377                         r = eth->mdio_bus.mdio & 1;
 378                         break;
 379         default:
 380                 r = eth->regs[addr];
 381                 D(printf ("%s %x\n", __func__, addr * 4));
 382                 break;
 383         }
 384         return r;
 385 }
 386
 387 static void eth_update_ma(struct fs_eth *eth, int ma)
 388 {
 389         int reg;
 390         int i = 0;
 391
 392         ma &= 1;
 393
 394         reg = RW_MA0_LO;
 395         if (ma)
 396                 reg = RW_MA1_LO;
 397
 398         eth->macaddr[ma][i++] = eth->regs[reg];
 399         eth->macaddr[ma][i++] = eth->regs[reg] >> 8;
 400         eth->macaddr[ma][i++] = eth->regs[reg] >> 16;
 401         eth->macaddr[ma][i++] = eth->regs[reg] >> 24;
 402         eth->macaddr[ma][i++] = eth->regs[reg + 1];
 403         eth->macaddr[ma][i++] = eth->regs[reg + 1] >> 8;
 404
 405         D(printf("set mac%d=%x.%x.%x.%x.%x.%x\n", ma,
 406                  eth->macaddr[ma][0], eth->macaddr[ma][1],
 407                  eth->macaddr[ma][2], eth->macaddr[ma][3],
 408                  eth->macaddr[ma][4], eth->macaddr[ma][5]));
 409 }
 410
 411 static void
 412 eth_writel (void *opaque, a_target_phys_addr addr, uint32_t value)
 413 {
 414         struct fs_eth *eth = opaque;
 415
 416         addr >>= 2;
 417         switch (addr)
 418         {
 419                 case RW_MA0_LO:
 420                 case RW_MA0_HI:
 421                         eth->regs[addr] = value;
 422                         eth_update_ma(eth, 0);
 423                         break;
 424                 case RW_MA1_LO:
 425                 case RW_MA1_HI:
 426                         eth->regs[addr] = value;
 427                         eth_update_ma(eth, 1);
 428                         break;
 429
 430                 case RW_MGM_CTRL:
 431                         /* Attach an MDIO/PHY abstraction.  */
 432                         if (value & 2)
 433                                 eth->mdio_bus.mdio = value & 1;
 434                         if (eth->mdio_bus.mdc != (value & 4)) {
 435                                 mdio_cycle(&eth->mdio_bus);
 436                                 eth_validate_duplex(eth);
 437                         }
 438                         eth->mdio_bus.mdc = !!(value & 4);
 439                         break;
 440
 441                 case RW_REC_CTRL:
 442                         eth->regs[addr] = value;
 443                         eth_validate_duplex(eth);
 444                         break;
 445
 446                 default:
 447                         eth->regs[addr] = value;
 448                         D(printf ("%s %x %x\n",
 449                                   __func__, addr, value));
 450                         break;
 451         }
 452 }
 453
 454 /* The ETRAX FS has a groupt address table (GAT) which works like a k=1 bloom
 455    filter dropping group addresses we have not joined.  The filter has 64
 456    bits (m). The has function is a simple nible xor of the group addr.  */
 457 static int eth_match_groupaddr(struct fs_eth *eth, const unsigned char *sa)
 458 {
 459         unsigned int hsh;
 460         int m_individual = eth->regs[RW_REC_CTRL] & 4;
 461         int match;
 462
 463         /* First bit on the wire of a MAC address signals multicast or
 464            physical address.  */
 465         if (!m_individual && !sa[0] & 1)
 466                 return 0;
 467
 468         /* Calculate the hash index for the GA registers. */
 469         hsh = 0;
 470         hsh ^= (*sa) & 0x3f;
 471         hsh ^= ((*sa) >> 6) & 0x03;
 472         ++sa;
 473         hsh ^= ((*sa) << 2) & 0x03c;
 474         hsh ^= ((*sa) >> 4) & 0xf;
 475         ++sa;
 476         hsh ^= ((*sa) << 4) & 0x30;
 477         hsh ^= ((*sa) >> 2) & 0x3f;
 478         ++sa;
 479         hsh ^= (*sa) & 0x3f;
 480         hsh ^= ((*sa) >> 6) & 0x03;
 481         ++sa;
 482         hsh ^= ((*sa) << 2) & 0x03c;
 483         hsh ^= ((*sa) >> 4) & 0xf;
 484         ++sa;
 485         hsh ^= ((*sa) << 4) & 0x30;
 486         hsh ^= ((*sa) >> 2) & 0x3f;
 487
 488         hsh &= 63;
 489         if (hsh > 31)
 490                 match = eth->regs[RW_GA_HI] & (1 << (hsh - 32));
 491         else
 492                 match = eth->regs[RW_GA_LO] & (1 << hsh);
 493         D(printf("hsh=%x ga=%x.%x mtch=%d\n", hsh,
 494                  eth->regs[RW_GA_HI], eth->regs[RW_GA_LO], match));
 495         return match;
 496 }
 497
 498 static int eth_can_receive(VLANClientState *vc)
 499 {
 500         return 1;
 501 }
 502
 503 static ssize_t eth_receive(VLANClientState *vc, const uint8_t *buf, size_t size)
 504 {
 505         unsigned char sa_bcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 506         struct fs_eth *eth = vc->opaque;
 507         int use_ma0 = eth->regs[RW_REC_CTRL] & 1;
 508         int use_ma1 = eth->regs[RW_REC_CTRL] & 2;
 509         int r_bcast = eth->regs[RW_REC_CTRL] & 8;
 510
 511         if (size < 12)
 512                 return -1;
 513
 514         D(printf("%x.%x.%x.%x.%x.%x ma=%d %d bc=%d\n",
 515                  buf[0], buf[1], buf[2], buf[3], buf[4], buf[5],
 516                  use_ma0, use_ma1, r_bcast));
 517
 518         /* Does the frame get through the address filters?  */
 519         if ((!use_ma0 || memcmp(buf, eth->macaddr[0], 6))
 520             && (!use_ma1 || memcmp(buf, eth->macaddr[1], 6))
 521             && (!r_bcast || memcmp(buf, sa_bcast, 6))
 522             && !eth_match_groupaddr(eth, buf))
 523                 return size;
 524
 525         /* FIXME: Find another way to pass on the fake csum.  */
 526         etraxfs_dmac_input(eth->dma_in, (void *)buf, size + 4, 1);
 527
 528         return size;
 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 * const eth_read[] = {
 548         NULL, NULL,
 549         &eth_readl,
 550 };
 551
 552 static CPUWriteMemoryFunc * const 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, a_target_phys_addr base, int phyaddr)
 568 {
 569         struct etraxfs_dma_client *dma = NULL;
 570         struct fs_eth *eth = NULL;
 571
 572         qemu_check_nic_model(nd, "fseth");
 573
 574         dma = qemu_mallocz(sizeof *dma * 2);
 575         eth = qemu_mallocz(sizeof *eth);
 576
 577         dma[0].client.push = eth_tx_push;
 578         dma[0].client.opaque = eth;
 579         dma[1].client.opaque = eth;
 580         dma[1].client.pull = NULL;
 581
 582         eth->dma_out = dma;
 583         eth->dma_in = dma + 1;
 584
 585         /* Connect the phy.  */
 586         eth->phyaddr = phyaddr & 0x1f;
 587         tdk_init(&eth->phy);
 588         mdio_attach(&eth->mdio_bus, &eth->phy, eth->phyaddr);
 589
 590         eth->ethregs = cpu_register_io_memory(eth_read, eth_write, eth);
 591         cpu_register_physical_memory (base, 0x5c, eth->ethregs);
 592
 593         eth->vc = nd->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name,
 594                                                 eth_can_receive, eth_receive,
 595                                                 NULL, eth_cleanup, eth);
 596         eth->vc->opaque = eth;
 597         eth->vc->link_status_changed = eth_set_link;
 598
 599         return dma;
 600 }