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 "qemu/osdep.h" 21 #include "hw/irq.h" 22 #include "hw/qdev-properties.h" 23 #include "hw/sysbus.h" 24 #include "migration/vmstate.h" 25 #include "net/net.h" 26 #include "qapi/error.h" 27 #include "qemu/module.h" 28 #include "qemu/timer.h" 29 #include <zlib.h> 30 #include "qom/object.h" 31 #include "trace.h" 32 33 static const char *reg_names[] = { 34 "CR", "DCR", "RCR", "TCR", "IMR", "ISR", "UTDA", "CTDA", 35 "TPS", "TFC", "TSA0", "TSA1", "TFS", "URDA", "CRDA", "CRBA0", 36 "CRBA1", "RBWC0", "RBWC1", "EOBC", "URRA", "RSA", "REA", "RRP", 37 "RWP", "TRBA0", "TRBA1", "0x1b", "0x1c", "0x1d", "0x1e", "LLFA", 38 "TTDA", "CEP", "CAP2", "CAP1", "CAP0", "CE", "CDP", "CDC", 39 "SR", "WT0", "WT1", "RSC", "CRCT", "FAET", "MPT", "MDT", 40 "0x30", "0x31", "0x32", "0x33", "0x34", "0x35", "0x36", "0x37", 41 "0x38", "0x39", "0x3a", "0x3b", "0x3c", "0x3d", "0x3e", "DCR2" }; 42 43 #define SONIC_CR 0x00 44 #define SONIC_DCR 0x01 45 #define SONIC_RCR 0x02 46 #define SONIC_TCR 0x03 47 #define SONIC_IMR 0x04 48 #define SONIC_ISR 0x05 49 #define SONIC_UTDA 0x06 50 #define SONIC_CTDA 0x07 51 #define SONIC_TPS 0x08 52 #define SONIC_TFC 0x09 53 #define SONIC_TSA0 0x0a 54 #define SONIC_TSA1 0x0b 55 #define SONIC_TFS 0x0c 56 #define SONIC_URDA 0x0d 57 #define SONIC_CRDA 0x0e 58 #define SONIC_CRBA0 0x0f 59 #define SONIC_CRBA1 0x10 60 #define SONIC_RBWC0 0x11 61 #define SONIC_RBWC1 0x12 62 #define SONIC_EOBC 0x13 63 #define SONIC_URRA 0x14 64 #define SONIC_RSA 0x15 65 #define SONIC_REA 0x16 66 #define SONIC_RRP 0x17 67 #define SONIC_RWP 0x18 68 #define SONIC_TRBA0 0x19 69 #define SONIC_TRBA1 0x1a 70 #define SONIC_LLFA 0x1f 71 #define SONIC_TTDA 0x20 72 #define SONIC_CEP 0x21 73 #define SONIC_CAP2 0x22 74 #define SONIC_CAP1 0x23 75 #define SONIC_CAP0 0x24 76 #define SONIC_CE 0x25 77 #define SONIC_CDP 0x26 78 #define SONIC_CDC 0x27 79 #define SONIC_SR 0x28 80 #define SONIC_WT0 0x29 81 #define SONIC_WT1 0x2a 82 #define SONIC_RSC 0x2b 83 #define SONIC_CRCT 0x2c 84 #define SONIC_FAET 0x2d 85 #define SONIC_MPT 0x2e 86 #define SONIC_MDT 0x2f 87 #define SONIC_DCR2 0x3f 88 #define SONIC_REG_COUNT 0x40 89 90 #define SONIC_CR_HTX 0x0001 91 #define SONIC_CR_TXP 0x0002 92 #define SONIC_CR_RXDIS 0x0004 93 #define SONIC_CR_RXEN 0x0008 94 #define SONIC_CR_STP 0x0010 95 #define SONIC_CR_ST 0x0020 96 #define SONIC_CR_RST 0x0080 97 #define SONIC_CR_RRRA 0x0100 98 #define SONIC_CR_LCAM 0x0200 99 #define SONIC_CR_MASK 0x03bf 100 101 #define SONIC_DCR_DW 0x0020 102 #define SONIC_DCR_LBR 0x2000 103 #define SONIC_DCR_EXBUS 0x8000 104 105 #define SONIC_RCR_PRX 0x0001 106 #define SONIC_RCR_LBK 0x0002 107 #define SONIC_RCR_FAER 0x0004 108 #define SONIC_RCR_CRCR 0x0008 109 #define SONIC_RCR_CRS 0x0020 110 #define SONIC_RCR_LPKT 0x0040 111 #define SONIC_RCR_BC 0x0080 112 #define SONIC_RCR_MC 0x0100 113 #define SONIC_RCR_LB0 0x0200 114 #define SONIC_RCR_LB1 0x0400 115 #define SONIC_RCR_AMC 0x0800 116 #define SONIC_RCR_PRO 0x1000 117 #define SONIC_RCR_BRD 0x2000 118 #define SONIC_RCR_RNT 0x4000 119 120 #define SONIC_TCR_PTX 0x0001 121 #define SONIC_TCR_BCM 0x0002 122 #define SONIC_TCR_FU 0x0004 123 #define SONIC_TCR_EXC 0x0040 124 #define SONIC_TCR_CRSL 0x0080 125 #define SONIC_TCR_NCRS 0x0100 126 #define SONIC_TCR_EXD 0x0400 127 #define SONIC_TCR_CRCI 0x2000 128 #define SONIC_TCR_PINT 0x8000 129 130 #define SONIC_ISR_RBAE 0x0010 131 #define SONIC_ISR_RBE 0x0020 132 #define SONIC_ISR_RDE 0x0040 133 #define SONIC_ISR_TC 0x0080 134 #define SONIC_ISR_TXDN 0x0200 135 #define SONIC_ISR_PKTRX 0x0400 136 #define SONIC_ISR_PINT 0x0800 137 #define SONIC_ISR_LCD 0x1000 138 139 #define SONIC_DESC_EOL 0x0001 140 #define SONIC_DESC_ADDR 0xFFFE 141 142 #define TYPE_DP8393X "dp8393x" 143 OBJECT_DECLARE_SIMPLE_TYPE(dp8393xState, DP8393X) 144 145 struct dp8393xState { 146 SysBusDevice parent_obj; 147 148 /* Hardware */ 149 uint8_t it_shift; 150 bool big_endian; 151 bool last_rba_is_full; 152 qemu_irq irq; 153 int irq_level; 154 QEMUTimer *watchdog; 155 int64_t wt_last_update; 156 NICConf conf; 157 NICState *nic; 158 MemoryRegion mmio; 159 160 /* Registers */ 161 uint16_t cam[16][3]; 162 uint16_t regs[SONIC_REG_COUNT]; 163 164 /* Temporaries */ 165 uint8_t tx_buffer[0x10000]; 166 int loopback_packet; 167 168 /* Memory access */ 169 MemoryRegion *dma_mr; 170 AddressSpace as; 171 }; 172 173 /* 174 * Accessor functions for values which are formed by 175 * concatenating two 16 bit device registers. By putting these 176 * in their own functions with a uint32_t return type we avoid the 177 * pitfall of implicit sign extension where ((x << 16) | y) is a 178 * signed 32 bit integer that might get sign-extended to a 64 bit integer. 179 */ 180 static uint32_t dp8393x_cdp(dp8393xState *s) 181 { 182 return (s->regs[SONIC_URRA] << 16) | s->regs[SONIC_CDP]; 183 } 184 185 static uint32_t dp8393x_crba(dp8393xState *s) 186 { 187 return (s->regs[SONIC_CRBA1] << 16) | s->regs[SONIC_CRBA0]; 188 } 189 190 static uint32_t dp8393x_crda(dp8393xState *s) 191 { 192 return (s->regs[SONIC_URDA] << 16) | 193 (s->regs[SONIC_CRDA] & SONIC_DESC_ADDR); 194 } 195 196 static uint32_t dp8393x_rbwc(dp8393xState *s) 197 { 198 return (s->regs[SONIC_RBWC1] << 16) | s->regs[SONIC_RBWC0]; 199 } 200 201 static uint32_t dp8393x_rrp(dp8393xState *s) 202 { 203 return (s->regs[SONIC_URRA] << 16) | s->regs[SONIC_RRP]; 204 } 205 206 static uint32_t dp8393x_tsa(dp8393xState *s) 207 { 208 return (s->regs[SONIC_TSA1] << 16) | s->regs[SONIC_TSA0]; 209 } 210 211 static uint32_t dp8393x_ttda(dp8393xState *s) 212 { 213 return (s->regs[SONIC_UTDA] << 16) | 214 (s->regs[SONIC_TTDA] & SONIC_DESC_ADDR); 215 } 216 217 static uint32_t dp8393x_wt(dp8393xState *s) 218 { 219 return s->regs[SONIC_WT1] << 16 | s->regs[SONIC_WT0]; 220 } 221 222 static uint16_t dp8393x_get(dp8393xState *s, hwaddr addr, int offset) 223 { 224 const MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED; 225 uint16_t val; 226 227 if (s->regs[SONIC_DCR] & SONIC_DCR_DW) { 228 addr += offset << 2; 229 if (s->big_endian) { 230 val = address_space_ldl_be(&s->as, addr, attrs, NULL); 231 } else { 232 val = address_space_ldl_le(&s->as, addr, attrs, NULL); 233 } 234 } else { 235 addr += offset << 1; 236 if (s->big_endian) { 237 val = address_space_lduw_be(&s->as, addr, attrs, NULL); 238 } else { 239 val = address_space_lduw_le(&s->as, addr, attrs, NULL); 240 } 241 } 242 243 return val; 244 } 245 246 static void dp8393x_put(dp8393xState *s, 247 hwaddr addr, int offset, uint16_t val) 248 { 249 const MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED; 250 251 if (s->regs[SONIC_DCR] & SONIC_DCR_DW) { 252 addr += offset << 2; 253 if (s->big_endian) { 254 address_space_stl_be(&s->as, addr, val, attrs, NULL); 255 } else { 256 address_space_stl_le(&s->as, addr, val, attrs, NULL); 257 } 258 } else { 259 addr += offset << 1; 260 if (s->big_endian) { 261 address_space_stw_be(&s->as, addr, val, attrs, NULL); 262 } else { 263 address_space_stw_le(&s->as, addr, val, attrs, NULL); 264 } 265 } 266 } 267 268 static void dp8393x_update_irq(dp8393xState *s) 269 { 270 int level = (s->regs[SONIC_IMR] & s->regs[SONIC_ISR]) ? 1 : 0; 271 272 if (level != s->irq_level) { 273 s->irq_level = level; 274 if (level) { 275 trace_dp8393x_raise_irq(s->regs[SONIC_ISR]); 276 } else { 277 trace_dp8393x_lower_irq(); 278 } 279 } 280 281 qemu_set_irq(s->irq, level); 282 } 283 284 static void dp8393x_do_load_cam(dp8393xState *s) 285 { 286 int width, size; 287 uint16_t index; 288 289 width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1; 290 size = sizeof(uint16_t) * 4 * width; 291 292 while (s->regs[SONIC_CDC] & 0x1f) { 293 /* Fill current entry */ 294 index = dp8393x_get(s, dp8393x_cdp(s), 0) & 0xf; 295 s->cam[index][0] = dp8393x_get(s, dp8393x_cdp(s), 1); 296 s->cam[index][1] = dp8393x_get(s, dp8393x_cdp(s), 2); 297 s->cam[index][2] = dp8393x_get(s, dp8393x_cdp(s), 3); 298 trace_dp8393x_load_cam(index, 299 s->cam[index][0] >> 8, s->cam[index][0] & 0xff, 300 s->cam[index][1] >> 8, s->cam[index][1] & 0xff, 301 s->cam[index][2] >> 8, s->cam[index][2] & 0xff); 302 /* Move to next entry */ 303 s->regs[SONIC_CDC]--; 304 s->regs[SONIC_CDP] += size; 305 } 306 307 /* Read CAM enable */ 308 s->regs[SONIC_CE] = dp8393x_get(s, dp8393x_cdp(s), 0); 309 trace_dp8393x_load_cam_done(s->regs[SONIC_CE]); 310 311 /* Done */ 312 s->regs[SONIC_CR] &= ~SONIC_CR_LCAM; 313 s->regs[SONIC_ISR] |= SONIC_ISR_LCD; 314 dp8393x_update_irq(s); 315 } 316 317 static void dp8393x_do_read_rra(dp8393xState *s) 318 { 319 int width, size; 320 321 /* Read memory */ 322 width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1; 323 size = sizeof(uint16_t) * 4 * width; 324 325 /* Update SONIC registers */ 326 s->regs[SONIC_CRBA0] = dp8393x_get(s, dp8393x_rrp(s), 0); 327 s->regs[SONIC_CRBA1] = dp8393x_get(s, dp8393x_rrp(s), 1); 328 s->regs[SONIC_RBWC0] = dp8393x_get(s, dp8393x_rrp(s), 2); 329 s->regs[SONIC_RBWC1] = dp8393x_get(s, dp8393x_rrp(s), 3); 330 trace_dp8393x_read_rra_regs(s->regs[SONIC_CRBA0], s->regs[SONIC_CRBA1], 331 s->regs[SONIC_RBWC0], s->regs[SONIC_RBWC1]); 332 333 /* Go to next entry */ 334 s->regs[SONIC_RRP] += size; 335 336 /* Handle wrap */ 337 if (s->regs[SONIC_RRP] == s->regs[SONIC_REA]) { 338 s->regs[SONIC_RRP] = s->regs[SONIC_RSA]; 339 } 340 341 /* Warn the host if CRBA now has the last available resource */ 342 if (s->regs[SONIC_RRP] == s->regs[SONIC_RWP]) { 343 s->regs[SONIC_ISR] |= SONIC_ISR_RBE; 344 dp8393x_update_irq(s); 345 } 346 347 /* Allow packet reception */ 348 s->last_rba_is_full = false; 349 } 350 351 static void dp8393x_do_software_reset(dp8393xState *s) 352 { 353 timer_del(s->watchdog); 354 355 s->regs[SONIC_CR] &= ~(SONIC_CR_LCAM | SONIC_CR_RRRA | SONIC_CR_TXP | 356 SONIC_CR_HTX); 357 s->regs[SONIC_CR] |= SONIC_CR_RST | SONIC_CR_RXDIS; 358 } 359 360 static void dp8393x_set_next_tick(dp8393xState *s) 361 { 362 uint32_t ticks; 363 int64_t delay; 364 365 if (s->regs[SONIC_CR] & SONIC_CR_STP) { 366 timer_del(s->watchdog); 367 return; 368 } 369 370 ticks = dp8393x_wt(s); 371 s->wt_last_update = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 372 delay = NANOSECONDS_PER_SECOND * ticks / 5000000; 373 timer_mod(s->watchdog, s->wt_last_update + delay); 374 } 375 376 static void dp8393x_update_wt_regs(dp8393xState *s) 377 { 378 int64_t elapsed; 379 uint32_t val; 380 381 if (s->regs[SONIC_CR] & SONIC_CR_STP) { 382 timer_del(s->watchdog); 383 return; 384 } 385 386 elapsed = s->wt_last_update - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 387 val = dp8393x_wt(s); 388 val -= elapsed / 5000000; 389 s->regs[SONIC_WT1] = (val >> 16) & 0xffff; 390 s->regs[SONIC_WT0] = (val >> 0) & 0xffff; 391 dp8393x_set_next_tick(s); 392 393 } 394 395 static void dp8393x_do_start_timer(dp8393xState *s) 396 { 397 s->regs[SONIC_CR] &= ~SONIC_CR_STP; 398 dp8393x_set_next_tick(s); 399 } 400 401 static void dp8393x_do_stop_timer(dp8393xState *s) 402 { 403 s->regs[SONIC_CR] &= ~SONIC_CR_ST; 404 dp8393x_update_wt_regs(s); 405 } 406 407 static bool dp8393x_can_receive(NetClientState *nc); 408 409 static void dp8393x_do_receiver_enable(dp8393xState *s) 410 { 411 s->regs[SONIC_CR] &= ~SONIC_CR_RXDIS; 412 if (dp8393x_can_receive(s->nic->ncs)) { 413 qemu_flush_queued_packets(qemu_get_queue(s->nic)); 414 } 415 } 416 417 static void dp8393x_do_receiver_disable(dp8393xState *s) 418 { 419 s->regs[SONIC_CR] &= ~SONIC_CR_RXEN; 420 } 421 422 static void dp8393x_do_transmit_packets(dp8393xState *s) 423 { 424 NetClientState *nc = qemu_get_queue(s->nic); 425 int tx_len, len; 426 uint16_t i; 427 428 while (1) { 429 /* Read memory */ 430 s->regs[SONIC_TTDA] = s->regs[SONIC_CTDA]; 431 trace_dp8393x_transmit_packet(dp8393x_ttda(s)); 432 tx_len = 0; 433 434 /* Update registers */ 435 s->regs[SONIC_TCR] = dp8393x_get(s, dp8393x_ttda(s), 1) & 0xf000; 436 s->regs[SONIC_TPS] = dp8393x_get(s, dp8393x_ttda(s), 2); 437 s->regs[SONIC_TFC] = dp8393x_get(s, dp8393x_ttda(s), 3); 438 s->regs[SONIC_TSA0] = dp8393x_get(s, dp8393x_ttda(s), 4); 439 s->regs[SONIC_TSA1] = dp8393x_get(s, dp8393x_ttda(s), 5); 440 s->regs[SONIC_TFS] = dp8393x_get(s, dp8393x_ttda(s), 6); 441 442 /* Handle programmable interrupt */ 443 if (s->regs[SONIC_TCR] & SONIC_TCR_PINT) { 444 s->regs[SONIC_ISR] |= SONIC_ISR_PINT; 445 } else { 446 s->regs[SONIC_ISR] &= ~SONIC_ISR_PINT; 447 } 448 449 for (i = 0; i < s->regs[SONIC_TFC]; ) { 450 /* Append fragment */ 451 len = s->regs[SONIC_TFS]; 452 if (tx_len + len > sizeof(s->tx_buffer)) { 453 len = sizeof(s->tx_buffer) - tx_len; 454 } 455 address_space_read(&s->as, dp8393x_tsa(s), MEMTXATTRS_UNSPECIFIED, 456 &s->tx_buffer[tx_len], len); 457 tx_len += len; 458 459 i++; 460 if (i != s->regs[SONIC_TFC]) { 461 /* Read next fragment details */ 462 s->regs[SONIC_TSA0] = dp8393x_get(s, dp8393x_ttda(s), 463 4 + 3 * i); 464 s->regs[SONIC_TSA1] = dp8393x_get(s, dp8393x_ttda(s), 465 5 + 3 * i); 466 s->regs[SONIC_TFS] = dp8393x_get(s, dp8393x_ttda(s), 467 6 + 3 * i); 468 } 469 } 470 471 /* Handle Ethernet checksum */ 472 if (!(s->regs[SONIC_TCR] & SONIC_TCR_CRCI)) { 473 /* 474 * Don't append FCS there, to look like slirp packets 475 * which don't have one 476 */ 477 } else { 478 /* Remove existing FCS */ 479 tx_len -= 4; 480 if (tx_len < 0) { 481 trace_dp8393x_transmit_txlen_error(tx_len); 482 break; 483 } 484 } 485 486 if (s->regs[SONIC_RCR] & (SONIC_RCR_LB1 | SONIC_RCR_LB0)) { 487 /* Loopback */ 488 s->regs[SONIC_TCR] |= SONIC_TCR_CRSL; 489 if (nc->info->can_receive(nc)) { 490 s->loopback_packet = 1; 491 qemu_receive_packet(nc, s->tx_buffer, tx_len); 492 } 493 } else { 494 /* Transmit packet */ 495 qemu_send_packet(nc, s->tx_buffer, tx_len); 496 } 497 s->regs[SONIC_TCR] |= SONIC_TCR_PTX; 498 499 /* Write status */ 500 dp8393x_put(s, dp8393x_ttda(s), 0, s->regs[SONIC_TCR] & 0x0fff); 501 502 if (!(s->regs[SONIC_CR] & SONIC_CR_HTX)) { 503 /* Read footer of packet */ 504 s->regs[SONIC_CTDA] = dp8393x_get(s, dp8393x_ttda(s), 505 4 + 3 * s->regs[SONIC_TFC]); 506 if (s->regs[SONIC_CTDA] & SONIC_DESC_EOL) { 507 /* EOL detected */ 508 break; 509 } 510 } 511 } 512 513 /* Done */ 514 s->regs[SONIC_CR] &= ~SONIC_CR_TXP; 515 s->regs[SONIC_ISR] |= SONIC_ISR_TXDN; 516 dp8393x_update_irq(s); 517 } 518 519 static void dp8393x_do_halt_transmission(dp8393xState *s) 520 { 521 /* Nothing to do */ 522 } 523 524 static void dp8393x_do_command(dp8393xState *s, uint16_t command) 525 { 526 if ((s->regs[SONIC_CR] & SONIC_CR_RST) && !(command & SONIC_CR_RST)) { 527 s->regs[SONIC_CR] &= ~SONIC_CR_RST; 528 return; 529 } 530 531 s->regs[SONIC_CR] |= (command & SONIC_CR_MASK); 532 533 if (command & SONIC_CR_HTX) { 534 dp8393x_do_halt_transmission(s); 535 } 536 if (command & SONIC_CR_TXP) { 537 dp8393x_do_transmit_packets(s); 538 } 539 if (command & SONIC_CR_RXDIS) { 540 dp8393x_do_receiver_disable(s); 541 } 542 if (command & SONIC_CR_RXEN) { 543 dp8393x_do_receiver_enable(s); 544 } 545 if (command & SONIC_CR_STP) { 546 dp8393x_do_stop_timer(s); 547 } 548 if (command & SONIC_CR_ST) { 549 dp8393x_do_start_timer(s); 550 } 551 if (command & SONIC_CR_RST) { 552 dp8393x_do_software_reset(s); 553 } 554 if (command & SONIC_CR_RRRA) { 555 dp8393x_do_read_rra(s); 556 s->regs[SONIC_CR] &= ~SONIC_CR_RRRA; 557 } 558 if (command & SONIC_CR_LCAM) { 559 dp8393x_do_load_cam(s); 560 } 561 } 562 563 static uint64_t dp8393x_read(void *opaque, hwaddr addr, unsigned int size) 564 { 565 dp8393xState *s = opaque; 566 int reg = addr >> s->it_shift; 567 uint16_t val = 0; 568 569 switch (reg) { 570 /* Update data before reading it */ 571 case SONIC_WT0: 572 case SONIC_WT1: 573 dp8393x_update_wt_regs(s); 574 val = s->regs[reg]; 575 break; 576 /* Accept read to some registers only when in reset mode */ 577 case SONIC_CAP2: 578 case SONIC_CAP1: 579 case SONIC_CAP0: 580 if (s->regs[SONIC_CR] & SONIC_CR_RST) { 581 val = s->cam[s->regs[SONIC_CEP] & 0xf][SONIC_CAP0 - reg]; 582 } 583 break; 584 /* All other registers have no special contraints */ 585 default: 586 val = s->regs[reg]; 587 } 588 589 trace_dp8393x_read(reg, reg_names[reg], val, size); 590 591 return val; 592 } 593 594 static void dp8393x_write(void *opaque, hwaddr addr, uint64_t val, 595 unsigned int size) 596 { 597 dp8393xState *s = opaque; 598 int reg = addr >> s->it_shift; 599 600 trace_dp8393x_write(reg, reg_names[reg], val, size); 601 602 switch (reg) { 603 /* Command register */ 604 case SONIC_CR: 605 dp8393x_do_command(s, val); 606 break; 607 /* Prevent write to read-only registers */ 608 case SONIC_CAP2: 609 case SONIC_CAP1: 610 case SONIC_CAP0: 611 case SONIC_SR: 612 case SONIC_MDT: 613 trace_dp8393x_write_invalid(reg); 614 break; 615 /* Accept write to some registers only when in reset mode */ 616 case SONIC_DCR: 617 if (s->regs[SONIC_CR] & SONIC_CR_RST) { 618 s->regs[reg] = val & 0xbfff; 619 } else { 620 trace_dp8393x_write_invalid_dcr("DCR"); 621 } 622 break; 623 case SONIC_DCR2: 624 if (s->regs[SONIC_CR] & SONIC_CR_RST) { 625 s->regs[reg] = val & 0xf017; 626 } else { 627 trace_dp8393x_write_invalid_dcr("DCR2"); 628 } 629 break; 630 /* 12 lower bytes are Read Only */ 631 case SONIC_TCR: 632 s->regs[reg] = val & 0xf000; 633 break; 634 /* 9 lower bytes are Read Only */ 635 case SONIC_RCR: 636 s->regs[reg] = val & 0xffe0; 637 break; 638 /* Ignore most significant bit */ 639 case SONIC_IMR: 640 s->regs[reg] = val & 0x7fff; 641 dp8393x_update_irq(s); 642 break; 643 /* Clear bits by writing 1 to them */ 644 case SONIC_ISR: 645 val &= s->regs[reg]; 646 s->regs[reg] &= ~val; 647 if (val & SONIC_ISR_RBE) { 648 dp8393x_do_read_rra(s); 649 } 650 dp8393x_update_irq(s); 651 break; 652 /* The guest is required to store aligned pointers here */ 653 case SONIC_RSA: 654 case SONIC_REA: 655 case SONIC_RRP: 656 case SONIC_RWP: 657 if (s->regs[SONIC_DCR] & SONIC_DCR_DW) { 658 s->regs[reg] = val & 0xfffc; 659 } else { 660 s->regs[reg] = val & 0xfffe; 661 } 662 break; 663 /* Invert written value for some registers */ 664 case SONIC_CRCT: 665 case SONIC_FAET: 666 case SONIC_MPT: 667 s->regs[reg] = val ^ 0xffff; 668 break; 669 /* All other registers have no special contrainst */ 670 default: 671 s->regs[reg] = val; 672 } 673 674 if (reg == SONIC_WT0 || reg == SONIC_WT1) { 675 dp8393x_set_next_tick(s); 676 } 677 } 678 679 /* 680 * Since .impl.max_access_size is effectively controlled by the it_shift 681 * property, leave it unspecified for now to allow the memory API to 682 * correctly zero extend the 16-bit register values to the access size up to and 683 * including it_shift. 684 */ 685 static const MemoryRegionOps dp8393x_ops = { 686 .read = dp8393x_read, 687 .write = dp8393x_write, 688 .impl.min_access_size = 2, 689 .endianness = DEVICE_NATIVE_ENDIAN, 690 }; 691 692 static void dp8393x_watchdog(void *opaque) 693 { 694 dp8393xState *s = opaque; 695 696 if (s->regs[SONIC_CR] & SONIC_CR_STP) { 697 return; 698 } 699 700 s->regs[SONIC_WT1] = 0xffff; 701 s->regs[SONIC_WT0] = 0xffff; 702 dp8393x_set_next_tick(s); 703 704 /* Signal underflow */ 705 s->regs[SONIC_ISR] |= SONIC_ISR_TC; 706 dp8393x_update_irq(s); 707 } 708 709 static bool dp8393x_can_receive(NetClientState *nc) 710 { 711 dp8393xState *s = qemu_get_nic_opaque(nc); 712 713 return !!(s->regs[SONIC_CR] & SONIC_CR_RXEN); 714 } 715 716 static int dp8393x_receive_filter(dp8393xState *s, const uint8_t * buf, 717 int size) 718 { 719 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 720 int i; 721 722 /* Check promiscuous mode */ 723 if ((s->regs[SONIC_RCR] & SONIC_RCR_PRO) && (buf[0] & 1) == 0) { 724 return 0; 725 } 726 727 /* Check multicast packets */ 728 if ((s->regs[SONIC_RCR] & SONIC_RCR_AMC) && (buf[0] & 1) == 1) { 729 return SONIC_RCR_MC; 730 } 731 732 /* Check broadcast */ 733 if ((s->regs[SONIC_RCR] & SONIC_RCR_BRD) && 734 !memcmp(buf, bcast, sizeof(bcast))) { 735 return SONIC_RCR_BC; 736 } 737 738 /* Check CAM */ 739 for (i = 0; i < 16; i++) { 740 if (s->regs[SONIC_CE] & (1 << i)) { 741 /* Entry enabled */ 742 if (!memcmp(buf, s->cam[i], sizeof(s->cam[i]))) { 743 return 0; 744 } 745 } 746 } 747 748 return -1; 749 } 750 751 static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf, 752 size_t pkt_size) 753 { 754 dp8393xState *s = qemu_get_nic_opaque(nc); 755 int packet_type; 756 uint32_t available, address; 757 int rx_len, padded_len; 758 uint32_t checksum; 759 int size; 760 761 s->regs[SONIC_RCR] &= ~(SONIC_RCR_PRX | SONIC_RCR_LBK | SONIC_RCR_FAER | 762 SONIC_RCR_CRCR | SONIC_RCR_LPKT | SONIC_RCR_BC | SONIC_RCR_MC); 763 764 if (s->last_rba_is_full) { 765 return pkt_size; 766 } 767 768 rx_len = pkt_size + sizeof(checksum); 769 if (s->regs[SONIC_DCR] & SONIC_DCR_DW) { 770 padded_len = ((rx_len - 1) | 3) + 1; 771 } else { 772 padded_len = ((rx_len - 1) | 1) + 1; 773 } 774 775 if (padded_len > dp8393x_rbwc(s) * 2) { 776 trace_dp8393x_receive_oversize(pkt_size); 777 s->regs[SONIC_ISR] |= SONIC_ISR_RBAE; 778 dp8393x_update_irq(s); 779 s->regs[SONIC_RCR] |= SONIC_RCR_LPKT; 780 goto done; 781 } 782 783 packet_type = dp8393x_receive_filter(s, buf, pkt_size); 784 if (packet_type < 0) { 785 trace_dp8393x_receive_not_netcard(); 786 return -1; 787 } 788 789 /* Check for EOL */ 790 if (s->regs[SONIC_LLFA] & SONIC_DESC_EOL) { 791 /* Are we still in resource exhaustion? */ 792 s->regs[SONIC_LLFA] = dp8393x_get(s, dp8393x_crda(s), 5); 793 if (s->regs[SONIC_LLFA] & SONIC_DESC_EOL) { 794 /* Still EOL ; stop reception */ 795 return -1; 796 } 797 /* Link has been updated by host */ 798 799 /* Clear in_use */ 800 dp8393x_put(s, dp8393x_crda(s), 6, 0x0000); 801 802 /* Move to next descriptor */ 803 s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA]; 804 s->regs[SONIC_ISR] |= SONIC_ISR_PKTRX; 805 } 806 807 /* Save current position */ 808 s->regs[SONIC_TRBA1] = s->regs[SONIC_CRBA1]; 809 s->regs[SONIC_TRBA0] = s->regs[SONIC_CRBA0]; 810 811 /* Calculate the ethernet checksum */ 812 checksum = cpu_to_le32(crc32(0, buf, pkt_size)); 813 814 /* Put packet into RBA */ 815 trace_dp8393x_receive_packet(dp8393x_crba(s)); 816 address = dp8393x_crba(s); 817 address_space_write(&s->as, address, MEMTXATTRS_UNSPECIFIED, 818 buf, pkt_size); 819 address += pkt_size; 820 821 /* Put frame checksum into RBA */ 822 address_space_write(&s->as, address, MEMTXATTRS_UNSPECIFIED, 823 &checksum, sizeof(checksum)); 824 address += sizeof(checksum); 825 826 /* Pad short packets to keep pointers aligned */ 827 if (rx_len < padded_len) { 828 size = padded_len - rx_len; 829 address_space_write(&s->as, address, MEMTXATTRS_UNSPECIFIED, 830 "\xFF\xFF\xFF", size); 831 address += size; 832 } 833 834 s->regs[SONIC_CRBA1] = address >> 16; 835 s->regs[SONIC_CRBA0] = address & 0xffff; 836 available = dp8393x_rbwc(s); 837 available -= padded_len >> 1; 838 s->regs[SONIC_RBWC1] = available >> 16; 839 s->regs[SONIC_RBWC0] = available & 0xffff; 840 841 /* Update status */ 842 if (dp8393x_rbwc(s) < s->regs[SONIC_EOBC]) { 843 s->regs[SONIC_RCR] |= SONIC_RCR_LPKT; 844 } 845 s->regs[SONIC_RCR] |= packet_type; 846 s->regs[SONIC_RCR] |= SONIC_RCR_PRX; 847 if (s->loopback_packet) { 848 s->regs[SONIC_RCR] |= SONIC_RCR_LBK; 849 s->loopback_packet = 0; 850 } 851 852 /* Write status to memory */ 853 trace_dp8393x_receive_write_status(dp8393x_crda(s)); 854 dp8393x_put(s, dp8393x_crda(s), 0, s->regs[SONIC_RCR]); /* status */ 855 dp8393x_put(s, dp8393x_crda(s), 1, rx_len); /* byte count */ 856 dp8393x_put(s, dp8393x_crda(s), 2, s->regs[SONIC_TRBA0]); /* pkt_ptr0 */ 857 dp8393x_put(s, dp8393x_crda(s), 3, s->regs[SONIC_TRBA1]); /* pkt_ptr1 */ 858 dp8393x_put(s, dp8393x_crda(s), 4, s->regs[SONIC_RSC]); /* seq_no */ 859 860 /* Check link field */ 861 s->regs[SONIC_LLFA] = dp8393x_get(s, dp8393x_crda(s), 5); 862 if (s->regs[SONIC_LLFA] & SONIC_DESC_EOL) { 863 /* EOL detected */ 864 s->regs[SONIC_ISR] |= SONIC_ISR_RDE; 865 } else { 866 /* Clear in_use */ 867 dp8393x_put(s, dp8393x_crda(s), 6, 0x0000); 868 869 /* Move to next descriptor */ 870 s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA]; 871 s->regs[SONIC_ISR] |= SONIC_ISR_PKTRX; 872 } 873 874 dp8393x_update_irq(s); 875 876 s->regs[SONIC_RSC] = (s->regs[SONIC_RSC] & 0xff00) | 877 ((s->regs[SONIC_RSC] + 1) & 0x00ff); 878 879 done: 880 881 if (s->regs[SONIC_RCR] & SONIC_RCR_LPKT) { 882 if (s->regs[SONIC_RRP] == s->regs[SONIC_RWP]) { 883 /* Stop packet reception */ 884 s->last_rba_is_full = true; 885 } else { 886 /* Read next resource */ 887 dp8393x_do_read_rra(s); 888 } 889 } 890 891 return pkt_size; 892 } 893 894 static void dp8393x_reset(DeviceState *dev) 895 { 896 dp8393xState *s = DP8393X(dev); 897 timer_del(s->watchdog); 898 899 memset(s->regs, 0, sizeof(s->regs)); 900 s->regs[SONIC_SR] = 0x0004; /* only revision recognized by Linux/mips */ 901 s->regs[SONIC_CR] = SONIC_CR_RST | SONIC_CR_STP | SONIC_CR_RXDIS; 902 s->regs[SONIC_DCR] &= ~(SONIC_DCR_EXBUS | SONIC_DCR_LBR); 903 s->regs[SONIC_RCR] &= ~(SONIC_RCR_LB0 | SONIC_RCR_LB1 | SONIC_RCR_BRD | 904 SONIC_RCR_RNT); 905 s->regs[SONIC_TCR] |= SONIC_TCR_NCRS | SONIC_TCR_PTX; 906 s->regs[SONIC_TCR] &= ~SONIC_TCR_BCM; 907 s->regs[SONIC_IMR] = 0; 908 s->regs[SONIC_ISR] = 0; 909 s->regs[SONIC_DCR2] = 0; 910 s->regs[SONIC_EOBC] = 0x02F8; 911 s->regs[SONIC_RSC] = 0; 912 s->regs[SONIC_CE] = 0; 913 s->regs[SONIC_RSC] = 0; 914 915 /* Network cable is connected */ 916 s->regs[SONIC_RCR] |= SONIC_RCR_CRS; 917 918 dp8393x_update_irq(s); 919 } 920 921 static NetClientInfo net_dp83932_info = { 922 .type = NET_CLIENT_DRIVER_NIC, 923 .size = sizeof(NICState), 924 .can_receive = dp8393x_can_receive, 925 .receive = dp8393x_receive, 926 }; 927 928 static void dp8393x_instance_init(Object *obj) 929 { 930 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 931 dp8393xState *s = DP8393X(obj); 932 933 sysbus_init_mmio(sbd, &s->mmio); 934 sysbus_init_irq(sbd, &s->irq); 935 } 936 937 static void dp8393x_realize(DeviceState *dev, Error **errp) 938 { 939 dp8393xState *s = DP8393X(dev); 940 941 address_space_init(&s->as, s->dma_mr, "dp8393x"); 942 memory_region_init_io(&s->mmio, OBJECT(dev), &dp8393x_ops, s, 943 "dp8393x-regs", SONIC_REG_COUNT << s->it_shift); 944 945 s->nic = qemu_new_nic(&net_dp83932_info, &s->conf, 946 object_get_typename(OBJECT(dev)), dev->id, s); 947 qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a); 948 949 s->watchdog = timer_new_ns(QEMU_CLOCK_VIRTUAL, dp8393x_watchdog, s); 950 } 951 952 static const VMStateDescription vmstate_dp8393x = { 953 .name = "dp8393x", 954 .version_id = 1, 955 .minimum_version_id = 1, 956 .fields = (VMStateField []) { 957 VMSTATE_UINT16_2DARRAY(cam, dp8393xState, 16, 3), 958 VMSTATE_UINT16_ARRAY(regs, dp8393xState, SONIC_REG_COUNT), 959 VMSTATE_END_OF_LIST() 960 } 961 }; 962 963 static Property dp8393x_properties[] = { 964 DEFINE_NIC_PROPERTIES(dp8393xState, conf), 965 DEFINE_PROP_LINK("dma_mr", dp8393xState, dma_mr, 966 TYPE_MEMORY_REGION, MemoryRegion *), 967 DEFINE_PROP_UINT8("it_shift", dp8393xState, it_shift, 0), 968 DEFINE_PROP_BOOL("big_endian", dp8393xState, big_endian, false), 969 DEFINE_PROP_END_OF_LIST(), 970 }; 971 972 static void dp8393x_class_init(ObjectClass *klass, void *data) 973 { 974 DeviceClass *dc = DEVICE_CLASS(klass); 975 976 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 977 dc->realize = dp8393x_realize; 978 dc->reset = dp8393x_reset; 979 dc->vmsd = &vmstate_dp8393x; 980 device_class_set_props(dc, dp8393x_properties); 981 } 982 983 static const TypeInfo dp8393x_info = { 984 .name = TYPE_DP8393X, 985 .parent = TYPE_SYS_BUS_DEVICE, 986 .instance_size = sizeof(dp8393xState), 987 .instance_init = dp8393x_instance_init, 988 .class_init = dp8393x_class_init, 989 }; 990 991 static void dp8393x_register_types(void) 992 { 993 type_register_static(&dp8393x_info); 994 } 995 996 type_init(dp8393x_register_types) 997