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
  29 #include "etraxfs_dma.h"
  30
  31 #define D(x)
  32
  33 /* Advertisement control register. */
  34 #define ADVERTISE_10HALF        0x0020  /* Try for 10mbps half-duplex  */
  35 #define ADVERTISE_10FULL        0x0040  /* Try for 10mbps full-duplex  */
  36 #define ADVERTISE_100HALF       0x0080  /* Try for 100mbps half-duplex */
  37 #define ADVERTISE_100FULL       0x0100  /* Try for 100mbps full-duplex */
  38
  39 /*
  40  * The MDIO extensions in the TDK PHY model were reversed engineered from the
  41  * linux driver (PHYID and Diagnostics reg).
  42  * TODO: Add friendly names for the register nums.
  43  */
  44 struct qemu_phy
  45 {
  46         uint32_t regs[32];
  47
  48         int link;
  49
  50         unsigned int (*read)(struct qemu_phy *phy, unsigned int req);
  51         void (*write)(struct qemu_phy *phy, unsigned int req,
  52                       unsigned int data);
  53 };
  54
  55 static unsigned int tdk_read(struct qemu_phy *phy, unsigned int req)
  56 {
  57         int regnum;
  58         unsigned r = 0;
  59
  60         regnum = req & 0x1f;
  61
  62         switch (regnum) {
  63                 case 1:
  64                         if (!phy->link)
  65                                 break;
  66                         /* MR1.  */
  67                         /* Speeds and modes.  */
  68                         r |= (1 << 13) | (1 << 14);
  69                         r |= (1 << 11) | (1 << 12);
  70                         r |= (1 << 5); /* Autoneg complete.  */
  71                         r |= (1 << 3); /* Autoneg able.  */
  72                         r |= (1 << 2); /* link.  */
  73                         break;
  74                 case 5:
  75                         /* Link partner ability.
  76                            We are kind; always agree with whatever best mode
  77                            the guest advertises.  */
  78                         r = 1 << 14; /* Success.  */
  79                         /* Copy advertised modes.  */
  80                         r |= phy->regs[4] & (15 << 5);
  81                         /* Autoneg support.  */
  82                         r |= 1;
  83                         break;
  84                 case 18:
  85                 {
  86                         /* Diagnostics reg.  */
  87                         int duplex = 0;
  88                         int speed_100 = 0;
  89
  90                         if (!phy->link)
  91                                 break;
  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 static void mdio_write_req(struct qemu_mdio *bus)
 194 {
 195         struct qemu_phy *phy;
 196
 197         phy = bus->devs[bus->addr];
 198         if (phy && phy->write)
 199                 phy->write(phy, bus->req, bus->data);
 200 }
 201
 202 static void mdio_cycle(struct qemu_mdio *bus)
 203 {
 204         bus->cnt++;
 205
 206         D(printf("mdc=%d mdio=%d state=%d cnt=%d drv=%d\n",
 207                 bus->mdc, bus->mdio, bus->state, bus->cnt, bus->drive));
 208 #if 0
 209         if (bus->mdc)
 210                 printf("%d", bus->mdio);
 211 #endif
 212         switch (bus->state)
 213         {
 214                 case PREAMBLE:
 215                         if (bus->mdc) {
 216                                 if (bus->cnt >= (32 * 2) && !bus->mdio) {
 217                                         bus->cnt = 0;
 218                                         bus->state = SOF;
 219                                         bus->data = 0;
 220                                 }
 221                         }
 222                         break;
 223                 case SOF:
 224                         if (bus->mdc) {
 225                                 if (bus->mdio != 1)
 226                                         printf("WARNING: no SOF\n");
 227                                 if (bus->cnt == 1*2) {
 228                                         bus->cnt = 0;
 229                                         bus->opc = 0;
 230                                         bus->state = OPC;
 231                                 }
 232                         }
 233                         break;
 234                 case OPC:
 235                         if (bus->mdc) {
 236                                 bus->opc <<= 1;
 237                                 bus->opc |= bus->mdio & 1;
 238                                 if (bus->cnt == 2*2) {
 239                                         bus->cnt = 0;
 240                                         bus->addr = 0;
 241                                         bus->state = ADDR;
 242                                 }
 243                         }
 244                         break;
 245                 case ADDR:
 246                         if (bus->mdc) {
 247                                 bus->addr <<= 1;
 248                                 bus->addr |= bus->mdio & 1;
 249
 250                                 if (bus->cnt == 5*2) {
 251                                         bus->cnt = 0;
 252                                         bus->req = 0;
 253                                         bus->state = REQ;
 254                                 }
 255                         }
 256                         break;
 257                 case REQ:
 258                         if (bus->mdc) {
 259                                 bus->req <<= 1;
 260                                 bus->req |= bus->mdio & 1;
 261                                 if (bus->cnt == 5*2) {
 262                                         bus->cnt = 0;
 263                                         bus->state = TURNAROUND;
 264                                 }
 265                         }
 266                         break;
 267                 case TURNAROUND:
 268                         if (bus->mdc && bus->cnt == 2*2) {
 269                                 bus->mdio = 0;
 270                                 bus->cnt = 0;
 271
 272                                 if (bus->opc == 2) {
 273                                         bus->drive = 1;
 274                                         mdio_read_req(bus);
 275                                         bus->mdio = bus->data & 1;
 276                                 }
 277                                 bus->state = DATA;
 278                         }
 279                         break;
 280                 case DATA:
 281                         if (!bus->mdc) {
 282                                 if (bus->drive) {
 283                                         bus->mdio = !!(bus->data & (1 << 15));
 284                                         bus->data <<= 1;
 285                                 }
 286                         } else {
 287                                 if (!bus->drive) {
 288                                         bus->data <<= 1;
 289                                         bus->data |= bus->mdio;
 290                                 }
 291                                 if (bus->cnt == 16 * 2) {
 292                                         bus->cnt = 0;
 293                                         bus->state = PREAMBLE;
 294                                         if (!bus->drive)
 295                                                 mdio_write_req(bus);
 296                                         bus->drive = 0;
 297                                 }
 298                         }
 299                         break;
 300                 default:
 301                         break;
 302         }
 303 }
 304
 305 /* ETRAX-FS Ethernet MAC block starts here.  */
 306
 307 #define RW_MA0_LO         0x00
 308 #define RW_MA0_HI         0x01
 309 #define RW_MA1_LO         0x02
 310 #define RW_MA1_HI         0x03
 311 #define RW_GA_LO          0x04
 312 #define RW_GA_HI          0x05
 313 #define RW_GEN_CTRL       0x06
 314 #define RW_REC_CTRL       0x07
 315 #define RW_TR_CTRL        0x08
 316 #define RW_CLR_ERR        0x09
 317 #define RW_MGM_CTRL       0x0a
 318 #define R_STAT            0x0b
 319 #define FS_ETH_MAX_REGS   0x17
 320
 321 struct fs_eth
 322 {
 323         CPUState *env;
 324         qemu_irq *irq;
 325         VLANClientState *vc;
 326         int ethregs;
 327
 328         /* Two addrs in the filter.  */
 329         uint8_t macaddr[2][6];
 330         uint32_t regs[FS_ETH_MAX_REGS];
 331
 332         struct etraxfs_dma_client *dma_out;
 333         struct etraxfs_dma_client *dma_in;
 334
 335         /* MDIO bus.  */
 336         struct qemu_mdio mdio_bus;
 337         unsigned int phyaddr;
 338         int duplex_mismatch;
 339
 340         /* PHY.  */
 341         struct qemu_phy phy;
 342 };
 343
 344 static void eth_validate_duplex(struct fs_eth *eth)
 345 {
 346         struct qemu_phy *phy;
 347         unsigned int phy_duplex;
 348         unsigned int mac_duplex;
 349         int new_mm = 0;
 350
 351         phy = eth->mdio_bus.devs[eth->phyaddr];
 352         phy_duplex = !!(phy->read(phy, 18) & (1 << 11));
 353         mac_duplex = !!(eth->regs[RW_REC_CTRL] & 128);
 354
 355         if (mac_duplex != phy_duplex)
 356                 new_mm = 1;
 357
 358         if (eth->regs[RW_GEN_CTRL] & 1) {
 359                 if (new_mm != eth->duplex_mismatch) {
 360                         if (new_mm)
 361                                 printf("HW: WARNING "
 362                                        "ETH duplex mismatch MAC=%d PHY=%d\n",
 363                                        mac_duplex, phy_duplex);
 364                         else
 365                                 printf("HW: ETH duplex ok.\n");
 366                 }
 367                 eth->duplex_mismatch = new_mm;
 368         }
 369 }
 370
 371 static uint32_t eth_readl (void *opaque, target_phys_addr_t addr)
 372 {
 373         struct fs_eth *eth = opaque;
 374         uint32_t r = 0;
 375
 376         addr >>= 2;
 377
 378         switch (addr) {
 379                 case R_STAT:
 380                         r = eth->mdio_bus.mdio & 1;
 381                         break;
 382         default:
 383                 r = eth->regs[addr];
 384                 D(printf ("%s %x\n", __func__, addr * 4));
 385                 break;
 386         }
 387         return r;
 388 }
 389
 390 static void eth_update_ma(struct fs_eth *eth, int ma)
 391 {
 392         int reg;
 393         int i = 0;
 394
 395         ma &= 1;
 396
 397         reg = RW_MA0_LO;
 398         if (ma)
 399                 reg = RW_MA1_LO;
 400
 401         eth->macaddr[ma][i++] = eth->regs[reg];
 402         eth->macaddr[ma][i++] = eth->regs[reg] >> 8;
 403         eth->macaddr[ma][i++] = eth->regs[reg] >> 16;
 404         eth->macaddr[ma][i++] = eth->regs[reg] >> 24;
 405         eth->macaddr[ma][i++] = eth->regs[reg + 4];
 406         eth->macaddr[ma][i++] = eth->regs[reg + 4] >> 8;
 407
 408         D(printf("set mac%d=%x.%x.%x.%x.%x.%x\n", ma,
 409                  eth->macaddr[ma][0], eth->macaddr[ma][1],
 410                  eth->macaddr[ma][2], eth->macaddr[ma][3],
 411                  eth->macaddr[ma][4], eth->macaddr[ma][5]));
 412 }
 413
 414 static void
 415 eth_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
 416 {
 417         struct fs_eth *eth = opaque;
 418
 419         addr >>= 2;
 420         switch (addr)
 421         {
 422                 case RW_MA0_LO:
 423                 case RW_MA0_HI:
 424                         eth->regs[addr] = value;
 425                         eth_update_ma(eth, 0);
 426                         break;
 427                 case RW_MA1_LO:
 428                 case RW_MA1_HI:
 429                         eth->regs[addr] = value;
 430                         eth_update_ma(eth, 1);
 431                         break;
 432
 433                 case RW_MGM_CTRL:
 434                         /* Attach an MDIO/PHY abstraction.  */
 435                         if (value & 2)
 436                                 eth->mdio_bus.mdio = value & 1;
 437                         if (eth->mdio_bus.mdc != (value & 4)) {
 438                                 mdio_cycle(&eth->mdio_bus);
 439                                 eth_validate_duplex(eth);
 440                         }
 441                         eth->mdio_bus.mdc = !!(value & 4);
 442                         break;
 443
 444                 case RW_REC_CTRL:
 445                         eth->regs[addr] = value;
 446                         eth_validate_duplex(eth);
 447                         break;
 448
 449                 default:
 450                         eth->regs[addr] = value;
 451                         D(printf ("%s %x %x\n",
 452                                   __func__, addr, value));
 453                         break;
 454         }
 455 }
 456
 457 /* The ETRAX FS has a groupt address table (GAT) which works like a k=1 bloom
 458    filter dropping group addresses we have not joined.  The filter has 64
 459    bits (m). The has function is a simple nible xor of the group addr.  */
 460 static int eth_match_groupaddr(struct fs_eth *eth, const unsigned char *sa)
 461 {
 462         unsigned int hsh;
 463         int m_individual = eth->regs[RW_REC_CTRL] & 4;
 464         int match;
 465
 466         /* First bit on the wire of a MAC address signals multicast or
 467            physical address.  */
 468         if (!m_individual && !sa[0] & 1)
 469                 return 0;
 470
 471         /* Calculate the hash index for the GA registers. */
 472         hsh = 0;
 473         hsh ^= (*sa) & 0x3f;
 474         hsh ^= ((*sa) >> 6) & 0x03;
 475         ++sa;
 476         hsh ^= ((*sa) << 2) & 0x03c;
 477         hsh ^= ((*sa) >> 4) & 0xf;
 478         ++sa;
 479         hsh ^= ((*sa) << 4) & 0x30;
 480         hsh ^= ((*sa) >> 2) & 0x3f;
 481         ++sa;
 482         hsh ^= (*sa) & 0x3f;
 483         hsh ^= ((*sa) >> 6) & 0x03;
 484         ++sa;
 485         hsh ^= ((*sa) << 2) & 0x03c;
 486         hsh ^= ((*sa) >> 4) & 0xf;
 487         ++sa;
 488         hsh ^= ((*sa) << 4) & 0x30;
 489         hsh ^= ((*sa) >> 2) & 0x3f;
 490
 491         hsh &= 63;
 492         if (hsh > 31)
 493                 match = eth->regs[RW_GA_HI] & (1 << (hsh - 32));
 494         else
 495                 match = eth->regs[RW_GA_LO] & (1 << hsh);
 496         D(printf("hsh=%x ga=%x.%x mtch=%d\n", hsh,
 497                  eth->regs[RW_GA_HI], eth->regs[RW_GA_LO], match));
 498         return match;
 499 }
 500
 501 static int eth_can_receive(void *opaque)
 502 {
 503         return 1;
 504 }
 505
 506 static void eth_receive(void *opaque, const uint8_t *buf, int size)
 507 {
 508         unsigned char sa_bcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 509         struct fs_eth *eth = opaque;
 510         int use_ma0 = eth->regs[RW_REC_CTRL] & 1;
 511         int use_ma1 = eth->regs[RW_REC_CTRL] & 2;
 512         int r_bcast = eth->regs[RW_REC_CTRL] & 8;
 513
 514         if (size < 12)
 515                 return;
 516
 517         D(printf("%x.%x.%x.%x.%x.%x ma=%d %d bc=%d\n",
 518                  buf[0], buf[1], buf[2], buf[3], buf[4], buf[5],
 519                  use_ma0, use_ma1, r_bcast));
 520
 521         /* Does the frame get through the address filters?  */
 522         if ((!use_ma0 || memcmp(buf, eth->macaddr[0], 6))
 523             && (!use_ma1 || memcmp(buf, eth->macaddr[1], 6))
 524             && (!r_bcast || memcmp(buf, sa_bcast, 6))
 525             && !eth_match_groupaddr(eth, buf))
 526                 return;
 527
 528         /* FIXME: Find another way to pass on the fake csum.  */
 529         etraxfs_dmac_input(eth->dma_in, (void *)buf, size + 4, 1);
 530 }
 531
 532 static int eth_tx_push(void *opaque, unsigned char *buf, int len)
 533 {
 534         struct fs_eth *eth = opaque;
 535
 536         D(printf("%s buf=%p len=%d\n", __func__, buf, len));
 537         qemu_send_packet(eth->vc, buf, len);
 538         return len;
 539 }
 540
 541 static void eth_set_link(VLANClientState *vc)
 542 {
 543         struct fs_eth *eth = vc->opaque;
 544         D(printf("%s %d\n", __func__, vc->link_down));
 545         eth->phy.link = !vc->link_down;
 546 }
 547
 548 static CPUReadMemoryFunc *eth_read[] = {
 549         NULL, NULL,
 550         &eth_readl,
 551 };
 552
 553 static CPUWriteMemoryFunc *eth_write[] = {
 554         NULL, NULL,
 555         &eth_writel,
 556 };
 557
 558 void *etraxfs_eth_init(NICInfo *nd, CPUState *env,
 559                        qemu_irq *irq, target_phys_addr_t base, int phyaddr)
 560 {
 561         struct etraxfs_dma_client *dma = NULL;
 562         struct fs_eth *eth = NULL;
 563
 564         dma = qemu_mallocz(sizeof *dma * 2);
 565         if (!dma)
 566                 return NULL;
 567
 568         eth = qemu_mallocz(sizeof *eth);
 569         if (!eth)
 570                 goto err;
 571
 572         dma[0].client.push = eth_tx_push;
 573         dma[0].client.opaque = eth;
 574         dma[1].client.opaque = eth;
 575         dma[1].client.pull = NULL;
 576
 577         eth->env = env;
 578         eth->irq = irq;
 579         eth->dma_out = dma;
 580         eth->dma_in = dma + 1;
 581
 582         /* Connect the phy.  */
 583         eth->phyaddr = phyaddr & 0x1f;
 584         tdk_init(&eth->phy);
 585         mdio_attach(&eth->mdio_bus, &eth->phy, eth->phyaddr);
 586
 587         eth->ethregs = cpu_register_io_memory(0, eth_read, eth_write, eth);
 588         cpu_register_physical_memory (base, 0x5c, eth->ethregs);
 589
 590         eth->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name,
 591                                        eth_receive, eth_can_receive, eth);
 592         eth->vc->opaque = eth;
 593         eth->vc->link_status_changed = eth_set_link;
 594
 595         return dma;
 596   err:
 597         qemu_free(eth);
 598         qemu_free(dma);
 599         return NULL;
 600 }