hw/dp8393x.c

   1 /*
   2  * QEMU NS SONIC DP8393x netcard
   3  *
   4  * Copyright (c) 2008-2009 Herve Poussineau
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 2 of
   9  * the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "hw.h"
  21 #include "qemu-timer.h"
  22 #include "net.h"
  23 #include "mips.h"
  24
  25 //#define DEBUG_SONIC
  26
  27 /* Calculate CRCs properly on Rx packets */
  28 #define SONIC_CALCULATE_RXCRC
  29
  30 #if defined(SONIC_CALCULATE_RXCRC)
  31 /* For crc32 */
  32 #include <zlib.h>
  33 #endif
  34
  35 #ifdef DEBUG_SONIC
  36 #define DPRINTF(fmt, ...) \
  37 do { printf("sonic: " fmt , ##  __VA_ARGS__); } while (0)
  38 static const char* reg_names[] = {
  39     "CR", "DCR", "RCR", "TCR", "IMR", "ISR", "UTDA", "CTDA",
  40     "TPS", "TFC", "TSA0", "TSA1", "TFS", "URDA", "CRDA", "CRBA0",
  41     "CRBA1", "RBWC0", "RBWC1", "EOBC", "URRA", "RSA", "REA", "RRP",
  42     "RWP", "TRBA0", "TRBA1", "0x1b", "0x1c", "0x1d", "0x1e", "LLFA",
  43     "TTDA", "CEP", "CAP2", "CAP1", "CAP0", "CE", "CDP", "CDC",
  44     "SR", "WT0", "WT1", "RSC", "CRCT", "FAET", "MPT", "MDT",
  45     "0x30", "0x31", "0x32", "0x33", "0x34", "0x35", "0x36", "0x37",
  46     "0x38", "0x39", "0x3a", "0x3b", "0x3c", "0x3d", "0x3e", "DCR2" };
  47 #else
  48 #define DPRINTF(fmt, ...) do {} while (0)
  49 #endif
  50
  51 #define SONIC_ERROR(fmt, ...) \
  52 do { printf("sonic ERROR: %s: " fmt, __func__ , ## __VA_ARGS__); } while (0)
  53
  54 #define SONIC_CR     0x00
  55 #define SONIC_DCR    0x01
  56 #define SONIC_RCR    0x02
  57 #define SONIC_TCR    0x03
  58 #define SONIC_IMR    0x04
  59 #define SONIC_ISR    0x05
  60 #define SONIC_UTDA   0x06
  61 #define SONIC_CTDA   0x07
  62 #define SONIC_TPS    0x08
  63 #define SONIC_TFC    0x09
  64 #define SONIC_TSA0   0x0a
  65 #define SONIC_TSA1   0x0b
  66 #define SONIC_TFS    0x0c
  67 #define SONIC_URDA   0x0d
  68 #define SONIC_CRDA   0x0e
  69 #define SONIC_CRBA0  0x0f
  70 #define SONIC_CRBA1  0x10
  71 #define SONIC_RBWC0  0x11
  72 #define SONIC_RBWC1  0x12
  73 #define SONIC_EOBC   0x13
  74 #define SONIC_URRA   0x14
  75 #define SONIC_RSA    0x15
  76 #define SONIC_REA    0x16
  77 #define SONIC_RRP    0x17
  78 #define SONIC_RWP    0x18
  79 #define SONIC_TRBA0  0x19
  80 #define SONIC_TRBA1  0x1a
  81 #define SONIC_LLFA   0x1f
  82 #define SONIC_TTDA   0x20
  83 #define SONIC_CEP    0x21
  84 #define SONIC_CAP2   0x22
  85 #define SONIC_CAP1   0x23
  86 #define SONIC_CAP0   0x24
  87 #define SONIC_CE     0x25
  88 #define SONIC_CDP    0x26
  89 #define SONIC_CDC    0x27
  90 #define SONIC_SR     0x28
  91 #define SONIC_WT0    0x29
  92 #define SONIC_WT1    0x2a
  93 #define SONIC_RSC    0x2b
  94 #define SONIC_CRCT   0x2c
  95 #define SONIC_FAET   0x2d
  96 #define SONIC_MPT    0x2e
  97 #define SONIC_MDT    0x2f
  98 #define SONIC_DCR2   0x3f
  99
 100 #define SONIC_CR_HTX     0x0001
 101 #define SONIC_CR_TXP     0x0002
 102 #define SONIC_CR_RXDIS   0x0004
 103 #define SONIC_CR_RXEN    0x0008
 104 #define SONIC_CR_STP     0x0010
 105 #define SONIC_CR_ST      0x0020
 106 #define SONIC_CR_RST     0x0080
 107 #define SONIC_CR_RRRA    0x0100
 108 #define SONIC_CR_LCAM    0x0200
 109 #define SONIC_CR_MASK    0x03bf
 110
 111 #define SONIC_DCR_DW     0x0020
 112 #define SONIC_DCR_LBR    0x2000
 113 #define SONIC_DCR_EXBUS  0x8000
 114
 115 #define SONIC_RCR_PRX    0x0001
 116 #define SONIC_RCR_LBK    0x0002
 117 #define SONIC_RCR_FAER   0x0004
 118 #define SONIC_RCR_CRCR   0x0008
 119 #define SONIC_RCR_CRS    0x0020
 120 #define SONIC_RCR_LPKT   0x0040
 121 #define SONIC_RCR_BC     0x0080
 122 #define SONIC_RCR_MC     0x0100
 123 #define SONIC_RCR_LB0    0x0200
 124 #define SONIC_RCR_LB1    0x0400
 125 #define SONIC_RCR_AMC    0x0800
 126 #define SONIC_RCR_PRO    0x1000
 127 #define SONIC_RCR_BRD    0x2000
 128 #define SONIC_RCR_RNT    0x4000
 129
 130 #define SONIC_TCR_PTX    0x0001
 131 #define SONIC_TCR_BCM    0x0002
 132 #define SONIC_TCR_FU     0x0004
 133 #define SONIC_TCR_EXC    0x0040
 134 #define SONIC_TCR_CRSL   0x0080
 135 #define SONIC_TCR_NCRS   0x0100
 136 #define SONIC_TCR_EXD    0x0400
 137 #define SONIC_TCR_CRCI   0x2000
 138 #define SONIC_TCR_PINT   0x8000
 139
 140 #define SONIC_ISR_RBE    0x0020
 141 #define SONIC_ISR_RDE    0x0040
 142 #define SONIC_ISR_TC     0x0080
 143 #define SONIC_ISR_TXDN   0x0200
 144 #define SONIC_ISR_PKTRX  0x0400
 145 #define SONIC_ISR_PINT   0x0800
 146 #define SONIC_ISR_LCD    0x1000
 147
 148 typedef struct dp8393xState {
 149     /* Hardware */
 150     int it_shift;
 151     qemu_irq irq;
 152 #ifdef DEBUG_SONIC
 153     int irq_level;
 154 #endif
 155     QEMUTimer *watchdog;
 156     int64_t wt_last_update;
 157     VLANClientState *vc;
 158     int mmio_index;
 159
 160     /* Registers */
 161     uint8_t cam[16][6];
 162     uint16_t regs[0x40];
 163
 164     /* Temporaries */
 165     uint8_t tx_buffer[0x10000];
 166     int loopback_packet;
 167
 168     /* Memory access */
 169     void (*memory_rw)(void *opaque, target_phys_addr_t addr, uint8_t *buf, int len, int is_write);
 170     void* mem_opaque;
 171 } dp8393xState;
 172
 173 static void dp8393x_update_irq(dp8393xState *s)
 174 {
 175     int level = (s->regs[SONIC_IMR] & s->regs[SONIC_ISR]) ? 1 : 0;
 176
 177 #ifdef DEBUG_SONIC
 178     if (level != s->irq_level) {
 179         s->irq_level = level;
 180         if (level) {
 181             DPRINTF("raise irq, isr is 0x%04x\n", s->regs[SONIC_ISR]);
 182         } else {
 183             DPRINTF("lower irq\n");
 184         }
 185     }
 186 #endif
 187
 188     qemu_set_irq(s->irq, level);
 189 }
 190
 191 static void do_load_cam(dp8393xState *s)
 192 {
 193     uint16_t data[8];
 194     int width, size;
 195     uint16_t index = 0;
 196
 197     width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
 198     size = sizeof(uint16_t) * 4 * width;
 199
 200     while (s->regs[SONIC_CDC] & 0x1f) {
 201         /* Fill current entry */
 202         s->memory_rw(s->mem_opaque,
 203             (s->regs[SONIC_URRA] << 16) | s->regs[SONIC_CDP],
 204             (uint8_t *)data, size, 0);
 205         s->cam[index][0] = data[1 * width] & 0xff;
 206         s->cam[index][1] = data[1 * width] >> 8;
 207         s->cam[index][2] = data[2 * width] & 0xff;
 208         s->cam[index][3] = data[2 * width] >> 8;
 209         s->cam[index][4] = data[3 * width] & 0xff;
 210         s->cam[index][5] = data[3 * width] >> 8;
 211         DPRINTF("load cam[%d] with %02x%02x%02x%02x%02x%02x\n", index,
 212             s->cam[index][0], s->cam[index][1], s->cam[index][2],
 213             s->cam[index][3], s->cam[index][4], s->cam[index][5]);
 214         /* Move to next entry */
 215         s->regs[SONIC_CDC]--;
 216         s->regs[SONIC_CDP] += size;
 217         index++;
 218     }
 219
 220     /* Read CAM enable */
 221     s->memory_rw(s->mem_opaque,
 222         (s->regs[SONIC_URRA] << 16) | s->regs[SONIC_CDP],
 223         (uint8_t *)data, size, 0);
 224     s->regs[SONIC_CE] = data[0 * width];
 225     DPRINTF("load cam done. cam enable mask 0x%04x\n", s->regs[SONIC_CE]);
 226
 227     /* Done */
 228     s->regs[SONIC_CR] &= ~SONIC_CR_LCAM;
 229     s->regs[SONIC_ISR] |= SONIC_ISR_LCD;
 230     dp8393x_update_irq(s);
 231 }
 232
 233 static void do_read_rra(dp8393xState *s)
 234 {
 235     uint16_t data[8];
 236     int width, size;
 237
 238     /* Read memory */
 239     width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
 240     size = sizeof(uint16_t) * 4 * width;
 241     s->memory_rw(s->mem_opaque,
 242         (s->regs[SONIC_URRA] << 16) | s->regs[SONIC_RRP],
 243         (uint8_t *)data, size, 0);
 244
 245     /* Update SONIC registers */
 246     s->regs[SONIC_CRBA0] = data[0 * width];
 247     s->regs[SONIC_CRBA1] = data[1 * width];
 248     s->regs[SONIC_RBWC0] = data[2 * width];
 249     s->regs[SONIC_RBWC1] = data[3 * width];
 250     DPRINTF("CRBA0/1: 0x%04x/0x%04x, RBWC0/1: 0x%04x/0x%04x\n",
 251         s->regs[SONIC_CRBA0], s->regs[SONIC_CRBA1],
 252         s->regs[SONIC_RBWC0], s->regs[SONIC_RBWC1]);
 253
 254     /* Go to next entry */
 255     s->regs[SONIC_RRP] += size;
 256
 257     /* Handle wrap */
 258     if (s->regs[SONIC_RRP] == s->regs[SONIC_REA]) {
 259         s->regs[SONIC_RRP] = s->regs[SONIC_RSA];
 260     }
 261
 262     /* Check resource exhaustion */
 263     if (s->regs[SONIC_RRP] == s->regs[SONIC_RWP])
 264     {
 265         s->regs[SONIC_ISR] |= SONIC_ISR_RBE;
 266         dp8393x_update_irq(s);
 267     }
 268
 269     /* Done */
 270     s->regs[SONIC_CR] &= ~SONIC_CR_RRRA;
 271 }
 272
 273 static void do_software_reset(dp8393xState *s)
 274 {
 275     qemu_del_timer(s->watchdog);
 276
 277     s->regs[SONIC_CR] &= ~(SONIC_CR_LCAM | SONIC_CR_RRRA | SONIC_CR_TXP | SONIC_CR_HTX);
 278     s->regs[SONIC_CR] |= SONIC_CR_RST | SONIC_CR_RXDIS;
 279 }
 280
 281 static void set_next_tick(dp8393xState *s)
 282 {
 283     uint32_t ticks;
 284     int64_t delay;
 285
 286     if (s->regs[SONIC_CR] & SONIC_CR_STP) {
 287         qemu_del_timer(s->watchdog);
 288         return;
 289     }
 290
 291     ticks = s->regs[SONIC_WT1] << 16 | s->regs[SONIC_WT0];
 292     s->wt_last_update = qemu_get_clock(vm_clock);
 293     delay = ticks_per_sec * ticks / 5000000;
 294     qemu_mod_timer(s->watchdog, s->wt_last_update + delay);
 295 }
 296
 297 static void update_wt_regs(dp8393xState *s)
 298 {
 299     int64_t elapsed;
 300     uint32_t val;
 301
 302     if (s->regs[SONIC_CR] & SONIC_CR_STP) {
 303         qemu_del_timer(s->watchdog);
 304         return;
 305     }
 306
 307     elapsed = s->wt_last_update - qemu_get_clock(vm_clock);
 308     val = s->regs[SONIC_WT1] << 16 | s->regs[SONIC_WT0];
 309     val -= elapsed / 5000000;
 310     s->regs[SONIC_WT1] = (val >> 16) & 0xffff;
 311     s->regs[SONIC_WT0] = (val >> 0)  & 0xffff;
 312     set_next_tick(s);
 313
 314 }
 315
 316 static void do_start_timer(dp8393xState *s)
 317 {
 318     s->regs[SONIC_CR] &= ~SONIC_CR_STP;
 319     set_next_tick(s);
 320 }
 321
 322 static void do_stop_timer(dp8393xState *s)
 323 {
 324     s->regs[SONIC_CR] &= ~SONIC_CR_ST;
 325     update_wt_regs(s);
 326 }
 327
 328 static void do_receiver_enable(dp8393xState *s)
 329 {
 330     s->regs[SONIC_CR] &= ~SONIC_CR_RXDIS;
 331 }
 332
 333 static void do_receiver_disable(dp8393xState *s)
 334 {
 335     s->regs[SONIC_CR] &= ~SONIC_CR_RXEN;
 336 }
 337
 338 static void do_transmit_packets(dp8393xState *s)
 339 {
 340     uint16_t data[12];
 341     int width, size;
 342     int tx_len, len;
 343     uint16_t i;
 344
 345     width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
 346
 347     while (1) {
 348         /* Read memory */
 349         DPRINTF("Transmit packet at %08x\n",
 350                 (s->regs[SONIC_UTDA] << 16) | s->regs[SONIC_CTDA]);
 351         size = sizeof(uint16_t) * 6 * width;
 352         s->regs[SONIC_TTDA] = s->regs[SONIC_CTDA];
 353         s->memory_rw(s->mem_opaque,
 354             ((s->regs[SONIC_UTDA] << 16) | s->regs[SONIC_TTDA]) + sizeof(uint16_t) * width,
 355             (uint8_t *)data, size, 0);
 356         tx_len = 0;
 357
 358         /* Update registers */
 359         s->regs[SONIC_TCR] = data[0 * width] & 0xf000;
 360         s->regs[SONIC_TPS] = data[1 * width];
 361         s->regs[SONIC_TFC] = data[2 * width];
 362         s->regs[SONIC_TSA0] = data[3 * width];
 363         s->regs[SONIC_TSA1] = data[4 * width];
 364         s->regs[SONIC_TFS] = data[5 * width];
 365
 366         /* Handle programmable interrupt */
 367         if (s->regs[SONIC_TCR] & SONIC_TCR_PINT) {
 368             s->regs[SONIC_ISR] |= SONIC_ISR_PINT;
 369         } else {
 370             s->regs[SONIC_ISR] &= ~SONIC_ISR_PINT;
 371         }
 372
 373         for (i = 0; i < s->regs[SONIC_TFC]; ) {
 374             /* Append fragment */
 375             len = s->regs[SONIC_TFS];
 376             if (tx_len + len > sizeof(s->tx_buffer)) {
 377                 len = sizeof(s->tx_buffer) - tx_len;
 378             }
 379             s->memory_rw(s->mem_opaque,
 380                 (s->regs[SONIC_TSA1] << 16) | s->regs[SONIC_TSA0],
 381                 &s->tx_buffer[tx_len], len, 0);
 382             tx_len += len;
 383
 384             i++;
 385             if (i != s->regs[SONIC_TFC]) {
 386                 /* Read next fragment details */
 387                 size = sizeof(uint16_t) * 3 * width;
 388                 s->memory_rw(s->mem_opaque,
 389                     ((s->regs[SONIC_UTDA] << 16) | s->regs[SONIC_TTDA]) + sizeof(uint16_t) * (4 + 3 * i) * width,
 390                     (uint8_t *)data, size, 0);
 391                 s->regs[SONIC_TSA0] = data[0 * width];
 392                 s->regs[SONIC_TSA1] = data[1 * width];
 393                 s->regs[SONIC_TFS] = data[2 * width];
 394             }
 395         }
 396
 397         /* Handle Ethernet checksum */
 398         if (!(s->regs[SONIC_TCR] & SONIC_TCR_CRCI)) {
 399             /* Don't append FCS there, to look like slirp packets
 400              * which don't have one */
 401         } else {
 402             /* Remove existing FCS */
 403             tx_len -= 4;
 404         }
 405
 406         if (s->regs[SONIC_RCR] & (SONIC_RCR_LB1 | SONIC_RCR_LB0)) {
 407             /* Loopback */
 408             s->regs[SONIC_TCR] |= SONIC_TCR_CRSL;
 409             if (s->vc->can_receive(s->vc)) {
 410                 s->loopback_packet = 1;
 411                 s->vc->receive(s->vc, s->tx_buffer, tx_len);
 412             }
 413         } else {
 414             /* Transmit packet */
 415             qemu_send_packet(s->vc, s->tx_buffer, tx_len);
 416         }
 417         s->regs[SONIC_TCR] |= SONIC_TCR_PTX;
 418
 419         /* Write status */
 420         data[0 * width] = s->regs[SONIC_TCR] & 0x0fff; /* status */
 421         size = sizeof(uint16_t) * width;
 422         s->memory_rw(s->mem_opaque,
 423             (s->regs[SONIC_UTDA] << 16) | s->regs[SONIC_TTDA],
 424             (uint8_t *)data, size, 1);
 425
 426         if (!(s->regs[SONIC_CR] & SONIC_CR_HTX)) {
 427             /* Read footer of packet */
 428             size = sizeof(uint16_t) * width;
 429             s->memory_rw(s->mem_opaque,
 430                 ((s->regs[SONIC_UTDA] << 16) | s->regs[SONIC_TTDA]) + sizeof(uint16_t) * (4 + 3 * s->regs[SONIC_TFC]) * width,
 431                 (uint8_t *)data, size, 0);
 432             s->regs[SONIC_CTDA] = data[0 * width] & ~0x1;
 433             if (data[0 * width] & 0x1) {
 434                 /* EOL detected */
 435                 break;
 436             }
 437         }
 438     }
 439
 440     /* Done */
 441     s->regs[SONIC_CR] &= ~SONIC_CR_TXP;
 442     s->regs[SONIC_ISR] |= SONIC_ISR_TXDN;
 443     dp8393x_update_irq(s);
 444 }
 445
 446 static void do_halt_transmission(dp8393xState *s)
 447 {
 448     /* Nothing to do */
 449 }
 450
 451 static void do_command(dp8393xState *s, uint16_t command)
 452 {
 453     if ((s->regs[SONIC_CR] & SONIC_CR_RST) && !(command & SONIC_CR_RST)) {
 454         s->regs[SONIC_CR] &= ~SONIC_CR_RST;
 455         return;
 456     }
 457
 458     s->regs[SONIC_CR] |= (command & SONIC_CR_MASK);
 459
 460     if (command & SONIC_CR_HTX)
 461         do_halt_transmission(s);
 462     if (command & SONIC_CR_TXP)
 463         do_transmit_packets(s);
 464     if (command & SONIC_CR_RXDIS)
 465         do_receiver_disable(s);
 466     if (command & SONIC_CR_RXEN)
 467         do_receiver_enable(s);
 468     if (command & SONIC_CR_STP)
 469         do_stop_timer(s);
 470     if (command & SONIC_CR_ST)
 471         do_start_timer(s);
 472     if (command & SONIC_CR_RST)
 473         do_software_reset(s);
 474     if (command & SONIC_CR_RRRA)
 475         do_read_rra(s);
 476     if (command & SONIC_CR_LCAM)
 477         do_load_cam(s);
 478 }
 479
 480 static uint16_t read_register(dp8393xState *s, int reg)
 481 {
 482     uint16_t val = 0;
 483
 484     switch (reg) {
 485         /* Update data before reading it */
 486         case SONIC_WT0:
 487         case SONIC_WT1:
 488             update_wt_regs(s);
 489             val = s->regs[reg];
 490             break;
 491         /* Accept read to some registers only when in reset mode */
 492         case SONIC_CAP2:
 493         case SONIC_CAP1:
 494         case SONIC_CAP0:
 495             if (s->regs[SONIC_CR] & SONIC_CR_RST) {
 496                 val = s->cam[s->regs[SONIC_CEP] & 0xf][2* (SONIC_CAP0 - reg) + 1] << 8;
 497                 val |= s->cam[s->regs[SONIC_CEP] & 0xf][2* (SONIC_CAP0 - reg)];
 498             }
 499             break;
 500         /* All other registers have no special contrainst */
 501         default:
 502             val = s->regs[reg];
 503     }
 504
 505     DPRINTF("read 0x%04x from reg %s\n", val, reg_names[reg]);
 506
 507     return val;
 508 }
 509
 510 static void write_register(dp8393xState *s, int reg, uint16_t val)
 511 {
 512     DPRINTF("write 0x%04x to reg %s\n", val, reg_names[reg]);
 513
 514     switch (reg) {
 515         /* Command register */
 516         case SONIC_CR:
 517             do_command(s, val);;
 518             break;
 519         /* Prevent write to read-only registers */
 520         case SONIC_CAP2:
 521         case SONIC_CAP1:
 522         case SONIC_CAP0:
 523         case SONIC_SR:
 524         case SONIC_MDT:
 525             DPRINTF("writing to reg %d invalid\n", reg);
 526             break;
 527         /* Accept write to some registers only when in reset mode */
 528         case SONIC_DCR:
 529             if (s->regs[SONIC_CR] & SONIC_CR_RST) {
 530                 s->regs[reg] = val & 0xbfff;
 531             } else {
 532                 DPRINTF("writing to DCR invalid\n");
 533             }
 534             break;
 535         case SONIC_DCR2:
 536             if (s->regs[SONIC_CR] & SONIC_CR_RST) {
 537                 s->regs[reg] = val & 0xf017;
 538             } else {
 539                 DPRINTF("writing to DCR2 invalid\n");
 540             }
 541             break;
 542         /* 12 lower bytes are Read Only */
 543         case SONIC_TCR:
 544             s->regs[reg] = val & 0xf000;
 545             break;
 546         /* 9 lower bytes are Read Only */
 547         case SONIC_RCR:
 548             s->regs[reg] = val & 0xffe0;
 549             break;
 550         /* Ignore most significant bit */
 551         case SONIC_IMR:
 552             s->regs[reg] = val & 0x7fff;
 553             dp8393x_update_irq(s);
 554             break;
 555         /* Clear bits by writing 1 to them */
 556         case SONIC_ISR:
 557             val &= s->regs[reg];
 558             s->regs[reg] &= ~val;
 559             if (val & SONIC_ISR_RBE) {
 560                 do_read_rra(s);
 561             }
 562             dp8393x_update_irq(s);
 563             break;
 564         /* Ignore least significant bit */
 565         case SONIC_RSA:
 566         case SONIC_REA:
 567         case SONIC_RRP:
 568         case SONIC_RWP:
 569             s->regs[reg] = val & 0xfffe;
 570             break;
 571         /* Invert written value for some registers */
 572         case SONIC_CRCT:
 573         case SONIC_FAET:
 574         case SONIC_MPT:
 575             s->regs[reg] = val ^ 0xffff;
 576             break;
 577         /* All other registers have no special contrainst */
 578         default:
 579             s->regs[reg] = val;
 580     }
 581
 582     if (reg == SONIC_WT0 || reg == SONIC_WT1) {
 583         set_next_tick(s);
 584     }
 585 }
 586
 587 static void dp8393x_watchdog(void *opaque)
 588 {
 589     dp8393xState *s = opaque;
 590
 591     if (s->regs[SONIC_CR] & SONIC_CR_STP) {
 592         return;
 593     }
 594
 595     s->regs[SONIC_WT1] = 0xffff;
 596     s->regs[SONIC_WT0] = 0xffff;
 597     set_next_tick(s);
 598
 599     /* Signal underflow */
 600     s->regs[SONIC_ISR] |= SONIC_ISR_TC;
 601     dp8393x_update_irq(s);
 602 }
 603
 604 static uint32_t dp8393x_readw(void *opaque, target_phys_addr_t addr)
 605 {
 606     dp8393xState *s = opaque;
 607     int reg;
 608
 609     if ((addr & ((1 << s->it_shift) - 1)) != 0) {
 610         return 0;
 611     }
 612
 613     reg = addr >> s->it_shift;
 614     return read_register(s, reg);
 615 }
 616
 617 static uint32_t dp8393x_readb(void *opaque, target_phys_addr_t addr)
 618 {
 619     uint16_t v = dp8393x_readw(opaque, addr & ~0x1);
 620     return (v >> (8 * (addr & 0x1))) & 0xff;
 621 }
 622
 623 static uint32_t dp8393x_readl(void *opaque, target_phys_addr_t addr)
 624 {
 625     uint32_t v;
 626     v = dp8393x_readw(opaque, addr);
 627     v |= dp8393x_readw(opaque, addr + 2) << 16;
 628     return v;
 629 }
 630
 631 static void dp8393x_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
 632 {
 633     dp8393xState *s = opaque;
 634     int reg;
 635
 636     if ((addr & ((1 << s->it_shift) - 1)) != 0) {
 637         return;
 638     }
 639
 640     reg = addr >> s->it_shift;
 641
 642     write_register(s, reg, (uint16_t)val);
 643 }
 644
 645 static void dp8393x_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
 646 {
 647     uint16_t old_val = dp8393x_readw(opaque, addr & ~0x1);
 648
 649     switch (addr & 3) {
 650     case 0:
 651         val = val | (old_val & 0xff00);
 652         break;
 653     case 1:
 654         val = (val << 8) | (old_val & 0x00ff);
 655         break;
 656     }
 657     dp8393x_writew(opaque, addr & ~0x1, val);
 658 }
 659
 660 static void dp8393x_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
 661 {
 662     dp8393x_writew(opaque, addr, val & 0xffff);
 663     dp8393x_writew(opaque, addr + 2, (val >> 16) & 0xffff);
 664 }
 665
 666 static CPUReadMemoryFunc * const dp8393x_read[3] = {
 667     dp8393x_readb,
 668     dp8393x_readw,
 669     dp8393x_readl,
 670 };
 671
 672 static CPUWriteMemoryFunc * const dp8393x_write[3] = {
 673     dp8393x_writeb,
 674     dp8393x_writew,
 675     dp8393x_writel,
 676 };
 677
 678 static int nic_can_receive(VLANClientState *vc)
 679 {
 680     dp8393xState *s = vc->opaque;
 681
 682     if (!(s->regs[SONIC_CR] & SONIC_CR_RXEN))
 683         return 0;
 684     if (s->regs[SONIC_ISR] & SONIC_ISR_RBE)
 685         return 0;
 686     return 1;
 687 }
 688
 689 static int receive_filter(dp8393xState *s, const uint8_t * buf, int size)
 690 {
 691     static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 692     int i;
 693
 694     /* Check for runt packet (remember that checksum is not there) */
 695     if (size < 64 - 4) {
 696         return (s->regs[SONIC_RCR] & SONIC_RCR_RNT) ? 0 : -1;
 697     }
 698
 699     /* Check promiscuous mode */
 700     if ((s->regs[SONIC_RCR] & SONIC_RCR_PRO) && (buf[0] & 1) == 0) {
 701         return 0;
 702     }
 703
 704     /* Check multicast packets */
 705     if ((s->regs[SONIC_RCR] & SONIC_RCR_AMC) && (buf[0] & 1) == 1) {
 706         return SONIC_RCR_MC;
 707     }
 708
 709     /* Check broadcast */
 710     if ((s->regs[SONIC_RCR] & SONIC_RCR_BRD) && !memcmp(buf, bcast, sizeof(bcast))) {
 711         return SONIC_RCR_BC;
 712     }
 713
 714     /* Check CAM */
 715     for (i = 0; i < 16; i++) {
 716         if (s->regs[SONIC_CE] & (1 << i)) {
 717              /* Entry enabled */
 718              if (!memcmp(buf, s->cam[i], sizeof(s->cam[i]))) {
 719                  return 0;
 720              }
 721         }
 722     }
 723
 724     return -1;
 725 }
 726
 727 static ssize_t nic_receive(VLANClientState *vc, const uint8_t * buf, size_t size)
 728 {
 729     uint16_t data[10];
 730     dp8393xState *s = vc->opaque;
 731     int packet_type;
 732     uint32_t available, address;
 733     int width, rx_len = size;
 734     uint32_t checksum;
 735
 736     width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
 737
 738     s->regs[SONIC_RCR] &= ~(SONIC_RCR_PRX | SONIC_RCR_LBK | SONIC_RCR_FAER |
 739         SONIC_RCR_CRCR | SONIC_RCR_LPKT | SONIC_RCR_BC | SONIC_RCR_MC);
 740
 741     packet_type = receive_filter(s, buf, size);
 742     if (packet_type < 0) {
 743         DPRINTF("packet not for netcard\n");
 744         return -1;
 745     }
 746
 747     /* XXX: Check byte ordering */
 748
 749     /* Check for EOL */
 750     if (s->regs[SONIC_LLFA] & 0x1) {
 751         /* Are we still in resource exhaustion? */
 752         size = sizeof(uint16_t) * 1 * width;
 753         address = ((s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]) + sizeof(uint16_t) * 5 * width;
 754         s->memory_rw(s->mem_opaque, address, (uint8_t*)data, size, 0);
 755         if (data[0 * width] & 0x1) {
 756             /* Still EOL ; stop reception */
 757             return -1;
 758         } else {
 759             s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
 760         }
 761     }
 762
 763     /* Save current position */
 764     s->regs[SONIC_TRBA1] = s->regs[SONIC_CRBA1];
 765     s->regs[SONIC_TRBA0] = s->regs[SONIC_CRBA0];
 766
 767     /* Calculate the ethernet checksum */
 768 #ifdef SONIC_CALCULATE_RXCRC
 769     checksum = cpu_to_le32(crc32(0, buf, rx_len));
 770 #else
 771     checksum = 0;
 772 #endif
 773
 774     /* Put packet into RBA */
 775     DPRINTF("Receive packet at %08x\n", (s->regs[SONIC_CRBA1] << 16) | s->regs[SONIC_CRBA0]);
 776     address = (s->regs[SONIC_CRBA1] << 16) | s->regs[SONIC_CRBA0];
 777     s->memory_rw(s->mem_opaque, address, (uint8_t*)buf, rx_len, 1);
 778     address += rx_len;
 779     s->memory_rw(s->mem_opaque, address, (uint8_t*)&checksum, 4, 1);
 780     rx_len += 4;
 781     s->regs[SONIC_CRBA1] = address >> 16;
 782     s->regs[SONIC_CRBA0] = address & 0xffff;
 783     available = (s->regs[SONIC_RBWC1] << 16) | s->regs[SONIC_RBWC0];
 784     available -= rx_len / 2;
 785     s->regs[SONIC_RBWC1] = available >> 16;
 786     s->regs[SONIC_RBWC0] = available & 0xffff;
 787
 788     /* Update status */
 789     if (((s->regs[SONIC_RBWC1] << 16) | s->regs[SONIC_RBWC0]) < s->regs[SONIC_EOBC]) {
 790         s->regs[SONIC_RCR] |= SONIC_RCR_LPKT;
 791     }
 792     s->regs[SONIC_RCR] |= packet_type;
 793     s->regs[SONIC_RCR] |= SONIC_RCR_PRX;
 794     if (s->loopback_packet) {
 795         s->regs[SONIC_RCR] |= SONIC_RCR_LBK;
 796         s->loopback_packet = 0;
 797     }
 798
 799     /* Write status to memory */
 800     DPRINTF("Write status at %08x\n", (s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]);
 801     data[0 * width] = s->regs[SONIC_RCR]; /* status */
 802     data[1 * width] = rx_len; /* byte count */
 803     data[2 * width] = s->regs[SONIC_TRBA0]; /* pkt_ptr0 */
 804     data[3 * width] = s->regs[SONIC_TRBA1]; /* pkt_ptr1 */
 805     data[4 * width] = s->regs[SONIC_RSC]; /* seq_no */
 806     size = sizeof(uint16_t) * 5 * width;
 807     s->memory_rw(s->mem_opaque, (s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA], (uint8_t *)data, size, 1);
 808
 809     /* Move to next descriptor */
 810     size = sizeof(uint16_t) * width;
 811     s->memory_rw(s->mem_opaque,
 812         ((s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]) + sizeof(uint16_t) * 5 * width,
 813         (uint8_t *)data, size, 0);
 814     s->regs[SONIC_LLFA] = data[0 * width];
 815     if (s->regs[SONIC_LLFA] & 0x1) {
 816         /* EOL detected */
 817         s->regs[SONIC_ISR] |= SONIC_ISR_RDE;
 818     } else {
 819         data[0 * width] = 0; /* in_use */
 820         s->memory_rw(s->mem_opaque,
 821             ((s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]) + sizeof(uint16_t) * 6 * width,
 822             (uint8_t *)data, size, 1);
 823         s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
 824         s->regs[SONIC_ISR] |= SONIC_ISR_PKTRX;
 825         s->regs[SONIC_RSC] = (s->regs[SONIC_RSC] & 0xff00) | (((s->regs[SONIC_RSC] & 0x00ff) + 1) & 0x00ff);
 826
 827         if (s->regs[SONIC_RCR] & SONIC_RCR_LPKT) {
 828             /* Read next RRA */
 829             do_read_rra(s);
 830         }
 831     }
 832
 833     /* Done */
 834     dp8393x_update_irq(s);
 835
 836     return size;
 837 }
 838
 839 static void nic_reset(void *opaque)
 840 {
 841     dp8393xState *s = opaque;
 842     qemu_del_timer(s->watchdog);
 843
 844     s->regs[SONIC_CR] = SONIC_CR_RST | SONIC_CR_STP | SONIC_CR_RXDIS;
 845     s->regs[SONIC_DCR] &= ~(SONIC_DCR_EXBUS | SONIC_DCR_LBR);
 846     s->regs[SONIC_RCR] &= ~(SONIC_RCR_LB0 | SONIC_RCR_LB1 | SONIC_RCR_BRD | SONIC_RCR_RNT);
 847     s->regs[SONIC_TCR] |= SONIC_TCR_NCRS | SONIC_TCR_PTX;
 848     s->regs[SONIC_TCR] &= ~SONIC_TCR_BCM;
 849     s->regs[SONIC_IMR] = 0;
 850     s->regs[SONIC_ISR] = 0;
 851     s->regs[SONIC_DCR2] = 0;
 852     s->regs[SONIC_EOBC] = 0x02F8;
 853     s->regs[SONIC_RSC] = 0;
 854     s->regs[SONIC_CE] = 0;
 855     s->regs[SONIC_RSC] = 0;
 856
 857     /* Network cable is connected */
 858     s->regs[SONIC_RCR] |= SONIC_RCR_CRS;
 859
 860     dp8393x_update_irq(s);
 861 }
 862
 863 static void nic_cleanup(VLANClientState *vc)
 864 {
 865     dp8393xState *s = vc->opaque;
 866
 867     cpu_unregister_io_memory(s->mmio_index);
 868
 869     qemu_del_timer(s->watchdog);
 870     qemu_free_timer(s->watchdog);
 871
 872     qemu_free(s);
 873 }
 874
 875 void dp83932_init(NICInfo *nd, target_phys_addr_t base, int it_shift,
 876                   qemu_irq irq, void* mem_opaque,
 877                   void (*memory_rw)(void *opaque, target_phys_addr_t addr, uint8_t *buf, int len, int is_write))
 878 {
 879     dp8393xState *s;
 880
 881     qemu_check_nic_model(nd, "dp83932");
 882
 883     s = qemu_mallocz(sizeof(dp8393xState));
 884
 885     s->mem_opaque = mem_opaque;
 886     s->memory_rw = memory_rw;
 887     s->it_shift = it_shift;
 888     s->irq = irq;
 889     s->watchdog = qemu_new_timer(vm_clock, dp8393x_watchdog, s);
 890     s->regs[SONIC_SR] = 0x0004; /* only revision recognized by Linux */
 891
 892     s->vc = nd->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name,
 893                                           nic_can_receive, nic_receive, NULL,
 894                                           nic_cleanup, s);
 895
 896     qemu_format_nic_info_str(s->vc, nd->macaddr);
 897     qemu_register_reset(nic_reset, s);
 898     nic_reset(s);
 899
 900     s->mmio_index = cpu_register_io_memory(dp8393x_read, dp8393x_write, s);
 901     cpu_register_physical_memory(base, 0x40 << it_shift, s->mmio_index);
 902 }