1 /* 2 * Nuvoton NPCM7xx EMC Module 3 * 4 * Copyright 2020 Google LLC 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * for more details. 15 * 16 * Unsupported/unimplemented features: 17 * - MCMDR.FDUP (full duplex) is ignored, half duplex is not supported 18 * - Only CAM0 is supported, CAM[1-15] are not 19 * - writes to CAMEN.[1-15] are ignored, these bits always read as zeroes 20 * - MII is not implemented, MIIDA.BUSY and MIID always return zero 21 * - MCMDR.LBK is not implemented 22 * - MCMDR.{OPMOD,ENSQE,AEP,ARP} are not supported 23 * - H/W FIFOs are not supported, MCMDR.FFTCR is ignored 24 * - MGSTA.SQE is not supported 25 * - pause and control frames are not implemented 26 * - MGSTA.CCNT is not supported 27 * - MPCNT, DMARFS are not implemented 28 */ 29 30 #include "qemu/osdep.h" 31 32 /* For crc32 */ 33 #include <zlib.h> 34 35 #include "hw/irq.h" 36 #include "hw/qdev-clock.h" 37 #include "hw/qdev-properties.h" 38 #include "hw/net/npcm7xx_emc.h" 39 #include "net/eth.h" 40 #include "migration/vmstate.h" 41 #include "qemu/bitops.h" 42 #include "qemu/error-report.h" 43 #include "qemu/log.h" 44 #include "qemu/module.h" 45 #include "qemu/units.h" 46 #include "sysemu/dma.h" 47 #include "trace.h" 48 49 #define CRC_LENGTH 4 50 51 /* 52 * The maximum size of a (layer 2) ethernet frame as defined by 802.3. 53 * 1518 = 6(dest macaddr) + 6(src macaddr) + 2(proto) + 4(crc) + 1500(payload) 54 * This does not include an additional 4 for the vlan field (802.1q). 55 */ 56 #define MAX_ETH_FRAME_SIZE 1518 57 58 static const char *emc_reg_name(int regno) 59 { 60 #define REG(name) case REG_ ## name: return #name; 61 switch (regno) { 62 REG(CAMCMR) 63 REG(CAMEN) 64 REG(TXDLSA) 65 REG(RXDLSA) 66 REG(MCMDR) 67 REG(MIID) 68 REG(MIIDA) 69 REG(FFTCR) 70 REG(TSDR) 71 REG(RSDR) 72 REG(DMARFC) 73 REG(MIEN) 74 REG(MISTA) 75 REG(MGSTA) 76 REG(MPCNT) 77 REG(MRPC) 78 REG(MRPCC) 79 REG(MREPC) 80 REG(DMARFS) 81 REG(CTXDSA) 82 REG(CTXBSA) 83 REG(CRXDSA) 84 REG(CRXBSA) 85 case REG_CAMM_BASE + 0: return "CAM0M"; 86 case REG_CAML_BASE + 0: return "CAM0L"; 87 case REG_CAMM_BASE + 2 ... REG_CAMML_LAST: 88 /* Only CAM0 is supported, fold the others into something simple. */ 89 if (regno & 1) { 90 return "CAM<n>L"; 91 } else { 92 return "CAM<n>M"; 93 } 94 default: return "UNKNOWN"; 95 } 96 #undef REG 97 } 98 99 static void emc_reset(NPCM7xxEMCState *emc) 100 { 101 uint32_t value; 102 103 trace_npcm7xx_emc_reset(emc->emc_num); 104 105 memset(&emc->regs[0], 0, sizeof(emc->regs)); 106 107 /* These regs have non-zero reset values. */ 108 emc->regs[REG_TXDLSA] = 0xfffffffc; 109 emc->regs[REG_RXDLSA] = 0xfffffffc; 110 emc->regs[REG_MIIDA] = 0x00900000; 111 emc->regs[REG_FFTCR] = 0x0101; 112 emc->regs[REG_DMARFC] = 0x0800; 113 emc->regs[REG_MPCNT] = 0x7fff; 114 115 emc->tx_active = false; 116 emc->rx_active = false; 117 118 /* Set the MAC address in the register space. */ 119 value = (emc->conf.macaddr.a[0] << 24) | 120 (emc->conf.macaddr.a[1] << 16) | 121 (emc->conf.macaddr.a[2] << 8) | 122 emc->conf.macaddr.a[3]; 123 emc->regs[REG_CAMM_BASE] = value; 124 125 value = (emc->conf.macaddr.a[4] << 24) | (emc->conf.macaddr.a[5] << 16); 126 emc->regs[REG_CAML_BASE] = value; 127 } 128 129 static void npcm7xx_emc_reset(DeviceState *dev) 130 { 131 NPCM7xxEMCState *emc = NPCM7XX_EMC(dev); 132 emc_reset(emc); 133 } 134 135 static void emc_soft_reset(NPCM7xxEMCState *emc) 136 { 137 /* 138 * The docs say at least MCMDR.{LBK,OPMOD} bits are not changed during a 139 * soft reset, but does not go into further detail. For now, KISS. 140 */ 141 uint32_t mcmdr = emc->regs[REG_MCMDR]; 142 emc_reset(emc); 143 emc->regs[REG_MCMDR] = mcmdr & (REG_MCMDR_LBK | REG_MCMDR_OPMOD); 144 145 qemu_set_irq(emc->tx_irq, 0); 146 qemu_set_irq(emc->rx_irq, 0); 147 } 148 149 static void emc_set_link(NetClientState *nc) 150 { 151 /* Nothing to do yet. */ 152 } 153 154 /* MISTA.TXINTR is the union of the individual bits with their enables. */ 155 static void emc_update_mista_txintr(NPCM7xxEMCState *emc) 156 { 157 /* Only look at the bits we support. */ 158 uint32_t mask = (REG_MISTA_TXBERR | 159 REG_MISTA_TDU | 160 REG_MISTA_TXCP); 161 if (emc->regs[REG_MISTA] & emc->regs[REG_MIEN] & mask) { 162 emc->regs[REG_MISTA] |= REG_MISTA_TXINTR; 163 } else { 164 emc->regs[REG_MISTA] &= ~REG_MISTA_TXINTR; 165 } 166 } 167 168 /* MISTA.RXINTR is the union of the individual bits with their enables. */ 169 static void emc_update_mista_rxintr(NPCM7xxEMCState *emc) 170 { 171 /* Only look at the bits we support. */ 172 uint32_t mask = (REG_MISTA_RXBERR | 173 REG_MISTA_RDU | 174 REG_MISTA_RXGD); 175 if (emc->regs[REG_MISTA] & emc->regs[REG_MIEN] & mask) { 176 emc->regs[REG_MISTA] |= REG_MISTA_RXINTR; 177 } else { 178 emc->regs[REG_MISTA] &= ~REG_MISTA_RXINTR; 179 } 180 } 181 182 /* N.B. emc_update_mista_txintr must have already been called. */ 183 static void emc_update_tx_irq(NPCM7xxEMCState *emc) 184 { 185 int level = !!(emc->regs[REG_MISTA] & 186 emc->regs[REG_MIEN] & 187 REG_MISTA_TXINTR); 188 trace_npcm7xx_emc_update_tx_irq(level); 189 qemu_set_irq(emc->tx_irq, level); 190 } 191 192 /* N.B. emc_update_mista_rxintr must have already been called. */ 193 static void emc_update_rx_irq(NPCM7xxEMCState *emc) 194 { 195 int level = !!(emc->regs[REG_MISTA] & 196 emc->regs[REG_MIEN] & 197 REG_MISTA_RXINTR); 198 trace_npcm7xx_emc_update_rx_irq(level); 199 qemu_set_irq(emc->rx_irq, level); 200 } 201 202 /* Update IRQ states due to changes in MIEN,MISTA. */ 203 static void emc_update_irq_from_reg_change(NPCM7xxEMCState *emc) 204 { 205 emc_update_mista_txintr(emc); 206 emc_update_tx_irq(emc); 207 208 emc_update_mista_rxintr(emc); 209 emc_update_rx_irq(emc); 210 } 211 212 static int emc_read_tx_desc(dma_addr_t addr, NPCM7xxEMCTxDesc *desc) 213 { 214 if (dma_memory_read(&address_space_memory, addr, desc, 215 sizeof(*desc), MEMTXATTRS_UNSPECIFIED)) { 216 qemu_log_mask(LOG_GUEST_ERROR, "%s: Failed to read descriptor @ 0x%" 217 HWADDR_PRIx "\n", __func__, addr); 218 return -1; 219 } 220 desc->flags = le32_to_cpu(desc->flags); 221 desc->txbsa = le32_to_cpu(desc->txbsa); 222 desc->status_and_length = le32_to_cpu(desc->status_and_length); 223 desc->ntxdsa = le32_to_cpu(desc->ntxdsa); 224 return 0; 225 } 226 227 static int emc_write_tx_desc(const NPCM7xxEMCTxDesc *desc, dma_addr_t addr) 228 { 229 NPCM7xxEMCTxDesc le_desc; 230 231 le_desc.flags = cpu_to_le32(desc->flags); 232 le_desc.txbsa = cpu_to_le32(desc->txbsa); 233 le_desc.status_and_length = cpu_to_le32(desc->status_and_length); 234 le_desc.ntxdsa = cpu_to_le32(desc->ntxdsa); 235 if (dma_memory_write(&address_space_memory, addr, &le_desc, 236 sizeof(le_desc), MEMTXATTRS_UNSPECIFIED)) { 237 qemu_log_mask(LOG_GUEST_ERROR, "%s: Failed to write descriptor @ 0x%" 238 HWADDR_PRIx "\n", __func__, addr); 239 return -1; 240 } 241 return 0; 242 } 243 244 static int emc_read_rx_desc(dma_addr_t addr, NPCM7xxEMCRxDesc *desc) 245 { 246 if (dma_memory_read(&address_space_memory, addr, desc, 247 sizeof(*desc), MEMTXATTRS_UNSPECIFIED)) { 248 qemu_log_mask(LOG_GUEST_ERROR, "%s: Failed to read descriptor @ 0x%" 249 HWADDR_PRIx "\n", __func__, addr); 250 return -1; 251 } 252 desc->status_and_length = le32_to_cpu(desc->status_and_length); 253 desc->rxbsa = le32_to_cpu(desc->rxbsa); 254 desc->reserved = le32_to_cpu(desc->reserved); 255 desc->nrxdsa = le32_to_cpu(desc->nrxdsa); 256 return 0; 257 } 258 259 static int emc_write_rx_desc(const NPCM7xxEMCRxDesc *desc, dma_addr_t addr) 260 { 261 NPCM7xxEMCRxDesc le_desc; 262 263 le_desc.status_and_length = cpu_to_le32(desc->status_and_length); 264 le_desc.rxbsa = cpu_to_le32(desc->rxbsa); 265 le_desc.reserved = cpu_to_le32(desc->reserved); 266 le_desc.nrxdsa = cpu_to_le32(desc->nrxdsa); 267 if (dma_memory_write(&address_space_memory, addr, &le_desc, 268 sizeof(le_desc), MEMTXATTRS_UNSPECIFIED)) { 269 qemu_log_mask(LOG_GUEST_ERROR, "%s: Failed to write descriptor @ 0x%" 270 HWADDR_PRIx "\n", __func__, addr); 271 return -1; 272 } 273 return 0; 274 } 275 276 static void emc_set_mista(NPCM7xxEMCState *emc, uint32_t flags) 277 { 278 trace_npcm7xx_emc_set_mista(flags); 279 emc->regs[REG_MISTA] |= flags; 280 if (extract32(flags, 16, 16)) { 281 emc_update_mista_txintr(emc); 282 } 283 if (extract32(flags, 0, 16)) { 284 emc_update_mista_rxintr(emc); 285 } 286 } 287 288 static void emc_halt_tx(NPCM7xxEMCState *emc, uint32_t mista_flag) 289 { 290 emc->tx_active = false; 291 emc_set_mista(emc, mista_flag); 292 } 293 294 static void emc_halt_rx(NPCM7xxEMCState *emc, uint32_t mista_flag) 295 { 296 emc->rx_active = false; 297 emc_set_mista(emc, mista_flag); 298 } 299 300 static void emc_enable_rx_and_flush(NPCM7xxEMCState *emc) 301 { 302 emc->rx_active = true; 303 qemu_flush_queued_packets(qemu_get_queue(emc->nic)); 304 } 305 306 static void emc_set_next_tx_descriptor(NPCM7xxEMCState *emc, 307 const NPCM7xxEMCTxDesc *tx_desc, 308 uint32_t desc_addr) 309 { 310 /* Update the current descriptor, if only to reset the owner flag. */ 311 if (emc_write_tx_desc(tx_desc, desc_addr)) { 312 /* 313 * We just read it so this shouldn't generally happen. 314 * Error already reported. 315 */ 316 emc_set_mista(emc, REG_MISTA_TXBERR); 317 } 318 emc->regs[REG_CTXDSA] = TX_DESC_NTXDSA(tx_desc->ntxdsa); 319 } 320 321 static void emc_set_next_rx_descriptor(NPCM7xxEMCState *emc, 322 const NPCM7xxEMCRxDesc *rx_desc, 323 uint32_t desc_addr) 324 { 325 /* Update the current descriptor, if only to reset the owner flag. */ 326 if (emc_write_rx_desc(rx_desc, desc_addr)) { 327 /* 328 * We just read it so this shouldn't generally happen. 329 * Error already reported. 330 */ 331 emc_set_mista(emc, REG_MISTA_RXBERR); 332 } 333 emc->regs[REG_CRXDSA] = RX_DESC_NRXDSA(rx_desc->nrxdsa); 334 } 335 336 static void emc_try_send_next_packet(NPCM7xxEMCState *emc) 337 { 338 /* Working buffer for sending out packets. Most packets fit in this. */ 339 #define TX_BUFFER_SIZE 2048 340 uint8_t tx_send_buffer[TX_BUFFER_SIZE]; 341 uint32_t desc_addr = TX_DESC_NTXDSA(emc->regs[REG_CTXDSA]); 342 NPCM7xxEMCTxDesc tx_desc; 343 uint32_t next_buf_addr, length; 344 uint8_t *buf; 345 g_autofree uint8_t *malloced_buf = NULL; 346 347 if (emc_read_tx_desc(desc_addr, &tx_desc)) { 348 /* Error reading descriptor, already reported. */ 349 emc_halt_tx(emc, REG_MISTA_TXBERR); 350 emc_update_tx_irq(emc); 351 return; 352 } 353 354 /* Nothing we can do if we don't own the descriptor. */ 355 if (!(tx_desc.flags & TX_DESC_FLAG_OWNER_MASK)) { 356 trace_npcm7xx_emc_cpu_owned_desc(desc_addr); 357 emc_halt_tx(emc, REG_MISTA_TDU); 358 emc_update_tx_irq(emc); 359 return; 360 } 361 362 /* Give the descriptor back regardless of what happens. */ 363 tx_desc.flags &= ~TX_DESC_FLAG_OWNER_MASK; 364 tx_desc.status_and_length &= 0xffff; 365 366 /* 367 * Despite the h/w documentation saying the tx buffer is word aligned, 368 * the linux driver does not word align the buffer. There is value in not 369 * aligning the buffer: See the description of NET_IP_ALIGN in linux 370 * kernel sources. 371 */ 372 next_buf_addr = tx_desc.txbsa; 373 emc->regs[REG_CTXBSA] = next_buf_addr; 374 length = TX_DESC_PKT_LEN(tx_desc.status_and_length); 375 buf = &tx_send_buffer[0]; 376 377 if (length > sizeof(tx_send_buffer)) { 378 malloced_buf = g_malloc(length); 379 buf = malloced_buf; 380 } 381 382 if (dma_memory_read(&address_space_memory, next_buf_addr, buf, 383 length, MEMTXATTRS_UNSPECIFIED)) { 384 qemu_log_mask(LOG_GUEST_ERROR, "%s: Failed to read packet @ 0x%x\n", 385 __func__, next_buf_addr); 386 emc_set_mista(emc, REG_MISTA_TXBERR); 387 emc_set_next_tx_descriptor(emc, &tx_desc, desc_addr); 388 emc_update_tx_irq(emc); 389 trace_npcm7xx_emc_tx_done(emc->regs[REG_CTXDSA]); 390 return; 391 } 392 393 if ((tx_desc.flags & TX_DESC_FLAG_PADEN) && (length < MIN_PACKET_LENGTH)) { 394 memset(buf + length, 0, MIN_PACKET_LENGTH - length); 395 length = MIN_PACKET_LENGTH; 396 } 397 398 /* N.B. emc_receive can get called here. */ 399 qemu_send_packet(qemu_get_queue(emc->nic), buf, length); 400 trace_npcm7xx_emc_sent_packet(length); 401 402 tx_desc.status_and_length |= TX_DESC_STATUS_TXCP; 403 if (tx_desc.flags & TX_DESC_FLAG_INTEN) { 404 emc_set_mista(emc, REG_MISTA_TXCP); 405 } 406 if (emc->regs[REG_MISTA] & emc->regs[REG_MIEN] & REG_MISTA_TXINTR) { 407 tx_desc.status_and_length |= TX_DESC_STATUS_TXINTR; 408 } 409 410 emc_set_next_tx_descriptor(emc, &tx_desc, desc_addr); 411 emc_update_tx_irq(emc); 412 trace_npcm7xx_emc_tx_done(emc->regs[REG_CTXDSA]); 413 } 414 415 static bool emc_can_receive(NetClientState *nc) 416 { 417 NPCM7xxEMCState *emc = NPCM7XX_EMC(qemu_get_nic_opaque(nc)); 418 419 bool can_receive = emc->rx_active; 420 trace_npcm7xx_emc_can_receive(can_receive); 421 return can_receive; 422 } 423 424 /* If result is false then *fail_reason contains the reason. */ 425 static bool emc_receive_filter1(NPCM7xxEMCState *emc, const uint8_t *buf, 426 size_t len, const char **fail_reason) 427 { 428 eth_pkt_types_e pkt_type = get_eth_packet_type(PKT_GET_ETH_HDR(buf)); 429 430 switch (pkt_type) { 431 case ETH_PKT_BCAST: 432 if (emc->regs[REG_CAMCMR] & REG_CAMCMR_CCAM) { 433 return true; 434 } else { 435 *fail_reason = "Broadcast packet disabled"; 436 return !!(emc->regs[REG_CAMCMR] & REG_CAMCMR_ABP); 437 } 438 case ETH_PKT_MCAST: 439 if (emc->regs[REG_CAMCMR] & REG_CAMCMR_CCAM) { 440 return true; 441 } else { 442 *fail_reason = "Multicast packet disabled"; 443 return !!(emc->regs[REG_CAMCMR] & REG_CAMCMR_AMP); 444 } 445 case ETH_PKT_UCAST: { 446 bool matches; 447 uint32_t value; 448 struct MACAddr mac; 449 if (emc->regs[REG_CAMCMR] & REG_CAMCMR_AUP) { 450 return true; 451 } 452 453 value = emc->regs[REG_CAMM_BASE]; 454 mac.a[0] = value >> 24; 455 mac.a[1] = value >> 16; 456 mac.a[2] = value >> 8; 457 mac.a[3] = value >> 0; 458 value = emc->regs[REG_CAML_BASE]; 459 mac.a[4] = value >> 24; 460 mac.a[5] = value >> 16; 461 462 matches = ((emc->regs[REG_CAMCMR] & REG_CAMCMR_ECMP) && 463 /* We only support one CAM register, CAM0. */ 464 (emc->regs[REG_CAMEN] & (1 << 0)) && 465 memcmp(buf, mac.a, ETH_ALEN) == 0); 466 if (emc->regs[REG_CAMCMR] & REG_CAMCMR_CCAM) { 467 *fail_reason = "MACADDR matched, comparison complemented"; 468 return !matches; 469 } else { 470 *fail_reason = "MACADDR didn't match"; 471 return matches; 472 } 473 } 474 default: 475 g_assert_not_reached(); 476 } 477 } 478 479 static bool emc_receive_filter(NPCM7xxEMCState *emc, const uint8_t *buf, 480 size_t len) 481 { 482 const char *fail_reason = NULL; 483 bool ok = emc_receive_filter1(emc, buf, len, &fail_reason); 484 if (!ok) { 485 trace_npcm7xx_emc_packet_filtered_out(fail_reason); 486 } 487 return ok; 488 } 489 490 static ssize_t emc_receive(NetClientState *nc, const uint8_t *buf, size_t len1) 491 { 492 NPCM7xxEMCState *emc = NPCM7XX_EMC(qemu_get_nic_opaque(nc)); 493 const uint32_t len = len1; 494 size_t max_frame_len; 495 bool long_frame; 496 uint32_t desc_addr; 497 NPCM7xxEMCRxDesc rx_desc; 498 uint32_t crc; 499 uint8_t *crc_ptr; 500 uint32_t buf_addr; 501 502 trace_npcm7xx_emc_receiving_packet(len); 503 504 if (!emc_can_receive(nc)) { 505 qemu_log_mask(LOG_GUEST_ERROR, "%s: Unexpected packet\n", __func__); 506 return -1; 507 } 508 509 if (len < ETH_HLEN || 510 /* Defensive programming: drop unsupportable large packets. */ 511 len > 0xffff - CRC_LENGTH) { 512 qemu_log_mask(LOG_GUEST_ERROR, "%s: Dropped frame of %u bytes\n", 513 __func__, len); 514 return len; 515 } 516 517 /* 518 * DENI is set if EMC received the Length/Type field of the incoming 519 * packet, so it will be set regardless of what happens next. 520 */ 521 emc_set_mista(emc, REG_MISTA_DENI); 522 523 if (!emc_receive_filter(emc, buf, len)) { 524 emc_update_rx_irq(emc); 525 return len; 526 } 527 528 /* Huge frames (> DMARFC) are dropped. */ 529 max_frame_len = REG_DMARFC_RXMS(emc->regs[REG_DMARFC]); 530 if (len + CRC_LENGTH > max_frame_len) { 531 trace_npcm7xx_emc_packet_dropped(len); 532 emc_set_mista(emc, REG_MISTA_DFOI); 533 emc_update_rx_irq(emc); 534 return len; 535 } 536 537 /* 538 * Long Frames (> MAX_ETH_FRAME_SIZE) are also dropped, unless MCMDR.ALP 539 * is set. 540 */ 541 long_frame = false; 542 if (len + CRC_LENGTH > MAX_ETH_FRAME_SIZE) { 543 if (emc->regs[REG_MCMDR] & REG_MCMDR_ALP) { 544 long_frame = true; 545 } else { 546 trace_npcm7xx_emc_packet_dropped(len); 547 emc_set_mista(emc, REG_MISTA_PTLE); 548 emc_update_rx_irq(emc); 549 return len; 550 } 551 } 552 553 desc_addr = RX_DESC_NRXDSA(emc->regs[REG_CRXDSA]); 554 if (emc_read_rx_desc(desc_addr, &rx_desc)) { 555 /* Error reading descriptor, already reported. */ 556 emc_halt_rx(emc, REG_MISTA_RXBERR); 557 emc_update_rx_irq(emc); 558 return len; 559 } 560 561 /* Nothing we can do if we don't own the descriptor. */ 562 if (!(rx_desc.status_and_length & RX_DESC_STATUS_OWNER_MASK)) { 563 trace_npcm7xx_emc_cpu_owned_desc(desc_addr); 564 emc_halt_rx(emc, REG_MISTA_RDU); 565 emc_update_rx_irq(emc); 566 return len; 567 } 568 569 crc = 0; 570 crc_ptr = (uint8_t *) &crc; 571 if (!(emc->regs[REG_MCMDR] & REG_MCMDR_SPCRC)) { 572 crc = cpu_to_be32(crc32(~0, buf, len)); 573 } 574 575 /* Give the descriptor back regardless of what happens. */ 576 rx_desc.status_and_length &= ~RX_DESC_STATUS_OWNER_MASK; 577 578 buf_addr = rx_desc.rxbsa; 579 emc->regs[REG_CRXBSA] = buf_addr; 580 if (dma_memory_write(&address_space_memory, buf_addr, buf, 581 len, MEMTXATTRS_UNSPECIFIED) || 582 (!(emc->regs[REG_MCMDR] & REG_MCMDR_SPCRC) && 583 dma_memory_write(&address_space_memory, buf_addr + len, 584 crc_ptr, 4, MEMTXATTRS_UNSPECIFIED))) { 585 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bus error writing packet\n", 586 __func__); 587 emc_set_mista(emc, REG_MISTA_RXBERR); 588 emc_set_next_rx_descriptor(emc, &rx_desc, desc_addr); 589 emc_update_rx_irq(emc); 590 trace_npcm7xx_emc_rx_done(emc->regs[REG_CRXDSA]); 591 return len; 592 } 593 594 trace_npcm7xx_emc_received_packet(len); 595 596 /* Note: We've already verified len+4 <= 0xffff. */ 597 rx_desc.status_and_length = len; 598 if (!(emc->regs[REG_MCMDR] & REG_MCMDR_SPCRC)) { 599 rx_desc.status_and_length += 4; 600 } 601 rx_desc.status_and_length |= RX_DESC_STATUS_RXGD; 602 emc_set_mista(emc, REG_MISTA_RXGD); 603 604 if (emc->regs[REG_MISTA] & emc->regs[REG_MIEN] & REG_MISTA_RXINTR) { 605 rx_desc.status_and_length |= RX_DESC_STATUS_RXINTR; 606 } 607 if (long_frame) { 608 rx_desc.status_and_length |= RX_DESC_STATUS_PTLE; 609 } 610 611 emc_set_next_rx_descriptor(emc, &rx_desc, desc_addr); 612 emc_update_rx_irq(emc); 613 trace_npcm7xx_emc_rx_done(emc->regs[REG_CRXDSA]); 614 return len; 615 } 616 617 static uint64_t npcm7xx_emc_read(void *opaque, hwaddr offset, unsigned size) 618 { 619 NPCM7xxEMCState *emc = opaque; 620 uint32_t reg = offset / sizeof(uint32_t); 621 uint32_t result; 622 623 if (reg >= NPCM7XX_NUM_EMC_REGS) { 624 qemu_log_mask(LOG_GUEST_ERROR, 625 "%s: Invalid offset 0x%04" HWADDR_PRIx "\n", 626 __func__, offset); 627 return 0; 628 } 629 630 switch (reg) { 631 case REG_MIID: 632 /* 633 * We don't implement MII. For determinism, always return zero as 634 * writes record the last value written for debugging purposes. 635 */ 636 qemu_log_mask(LOG_UNIMP, "%s: Read of MIID, returning 0\n", __func__); 637 result = 0; 638 break; 639 case REG_TSDR: 640 case REG_RSDR: 641 qemu_log_mask(LOG_GUEST_ERROR, 642 "%s: Read of write-only reg, %s/%d\n", 643 __func__, emc_reg_name(reg), reg); 644 return 0; 645 default: 646 result = emc->regs[reg]; 647 break; 648 } 649 650 trace_npcm7xx_emc_reg_read(emc->emc_num, result, emc_reg_name(reg), reg); 651 return result; 652 } 653 654 static void npcm7xx_emc_write(void *opaque, hwaddr offset, 655 uint64_t v, unsigned size) 656 { 657 NPCM7xxEMCState *emc = opaque; 658 uint32_t reg = offset / sizeof(uint32_t); 659 uint32_t value = v; 660 661 g_assert(size == sizeof(uint32_t)); 662 663 if (reg >= NPCM7XX_NUM_EMC_REGS) { 664 qemu_log_mask(LOG_GUEST_ERROR, 665 "%s: Invalid offset 0x%04" HWADDR_PRIx "\n", 666 __func__, offset); 667 return; 668 } 669 670 trace_npcm7xx_emc_reg_write(emc->emc_num, emc_reg_name(reg), reg, value); 671 672 switch (reg) { 673 case REG_CAMCMR: 674 emc->regs[reg] = value; 675 break; 676 case REG_CAMEN: 677 /* Only CAM0 is supported, don't pretend otherwise. */ 678 if (value & ~1) { 679 qemu_log_mask(LOG_GUEST_ERROR, 680 "%s: Only CAM0 is supported, cannot enable others" 681 ": 0x%x\n", 682 __func__, value); 683 } 684 emc->regs[reg] = value & 1; 685 break; 686 case REG_CAMM_BASE + 0: 687 emc->regs[reg] = value; 688 break; 689 case REG_CAML_BASE + 0: 690 emc->regs[reg] = value; 691 break; 692 case REG_MCMDR: { 693 uint32_t prev; 694 if (value & REG_MCMDR_SWR) { 695 emc_soft_reset(emc); 696 /* On h/w the reset happens over multiple cycles. For now KISS. */ 697 break; 698 } 699 prev = emc->regs[reg]; 700 emc->regs[reg] = value; 701 /* Update tx state. */ 702 if (!(prev & REG_MCMDR_TXON) && 703 (value & REG_MCMDR_TXON)) { 704 emc->regs[REG_CTXDSA] = emc->regs[REG_TXDLSA]; 705 /* 706 * Linux kernel turns TX on with CPU still holding descriptor, 707 * which suggests we should wait for a write to TSDR before trying 708 * to send a packet: so we don't send one here. 709 */ 710 } else if ((prev & REG_MCMDR_TXON) && 711 !(value & REG_MCMDR_TXON)) { 712 emc->regs[REG_MGSTA] |= REG_MGSTA_TXHA; 713 } 714 if (!(value & REG_MCMDR_TXON)) { 715 emc_halt_tx(emc, 0); 716 } 717 /* Update rx state. */ 718 if (!(prev & REG_MCMDR_RXON) && 719 (value & REG_MCMDR_RXON)) { 720 emc->regs[REG_CRXDSA] = emc->regs[REG_RXDLSA]; 721 } else if ((prev & REG_MCMDR_RXON) && 722 !(value & REG_MCMDR_RXON)) { 723 emc->regs[REG_MGSTA] |= REG_MGSTA_RXHA; 724 } 725 if (value & REG_MCMDR_RXON) { 726 emc_enable_rx_and_flush(emc); 727 } else { 728 emc_halt_rx(emc, 0); 729 } 730 break; 731 } 732 case REG_TXDLSA: 733 case REG_RXDLSA: 734 case REG_DMARFC: 735 case REG_MIID: 736 emc->regs[reg] = value; 737 break; 738 case REG_MIEN: 739 emc->regs[reg] = value; 740 emc_update_irq_from_reg_change(emc); 741 break; 742 case REG_MISTA: 743 /* Clear the bits that have 1 in "value". */ 744 emc->regs[reg] &= ~value; 745 emc_update_irq_from_reg_change(emc); 746 break; 747 case REG_MGSTA: 748 /* Clear the bits that have 1 in "value". */ 749 emc->regs[reg] &= ~value; 750 break; 751 case REG_TSDR: 752 if (emc->regs[REG_MCMDR] & REG_MCMDR_TXON) { 753 emc->tx_active = true; 754 /* Keep trying to send packets until we run out. */ 755 while (emc->tx_active) { 756 emc_try_send_next_packet(emc); 757 } 758 } 759 break; 760 case REG_RSDR: 761 if (emc->regs[REG_MCMDR] & REG_MCMDR_RXON) { 762 emc_enable_rx_and_flush(emc); 763 } 764 break; 765 case REG_MIIDA: 766 emc->regs[reg] = value & ~REG_MIIDA_BUSY; 767 break; 768 case REG_MRPC: 769 case REG_MRPCC: 770 case REG_MREPC: 771 case REG_CTXDSA: 772 case REG_CTXBSA: 773 case REG_CRXDSA: 774 case REG_CRXBSA: 775 qemu_log_mask(LOG_GUEST_ERROR, 776 "%s: Write to read-only reg %s/%d\n", 777 __func__, emc_reg_name(reg), reg); 778 break; 779 default: 780 qemu_log_mask(LOG_UNIMP, "%s: Write to unimplemented reg %s/%d\n", 781 __func__, emc_reg_name(reg), reg); 782 break; 783 } 784 } 785 786 static const struct MemoryRegionOps npcm7xx_emc_ops = { 787 .read = npcm7xx_emc_read, 788 .write = npcm7xx_emc_write, 789 .endianness = DEVICE_LITTLE_ENDIAN, 790 .valid = { 791 .min_access_size = 4, 792 .max_access_size = 4, 793 .unaligned = false, 794 }, 795 }; 796 797 static void emc_cleanup(NetClientState *nc) 798 { 799 /* Nothing to do yet. */ 800 } 801 802 static NetClientInfo net_npcm7xx_emc_info = { 803 .type = NET_CLIENT_DRIVER_NIC, 804 .size = sizeof(NICState), 805 .can_receive = emc_can_receive, 806 .receive = emc_receive, 807 .cleanup = emc_cleanup, 808 .link_status_changed = emc_set_link, 809 }; 810 811 static void npcm7xx_emc_realize(DeviceState *dev, Error **errp) 812 { 813 NPCM7xxEMCState *emc = NPCM7XX_EMC(dev); 814 SysBusDevice *sbd = SYS_BUS_DEVICE(emc); 815 816 memory_region_init_io(&emc->iomem, OBJECT(emc), &npcm7xx_emc_ops, emc, 817 TYPE_NPCM7XX_EMC, 4 * KiB); 818 sysbus_init_mmio(sbd, &emc->iomem); 819 sysbus_init_irq(sbd, &emc->tx_irq); 820 sysbus_init_irq(sbd, &emc->rx_irq); 821 822 qemu_macaddr_default_if_unset(&emc->conf.macaddr); 823 emc->nic = qemu_new_nic(&net_npcm7xx_emc_info, &emc->conf, 824 object_get_typename(OBJECT(dev)), dev->id, 825 &dev->mem_reentrancy_guard, emc); 826 qemu_format_nic_info_str(qemu_get_queue(emc->nic), emc->conf.macaddr.a); 827 } 828 829 static void npcm7xx_emc_unrealize(DeviceState *dev) 830 { 831 NPCM7xxEMCState *emc = NPCM7XX_EMC(dev); 832 833 qemu_del_nic(emc->nic); 834 } 835 836 static const VMStateDescription vmstate_npcm7xx_emc = { 837 .name = TYPE_NPCM7XX_EMC, 838 .version_id = 0, 839 .minimum_version_id = 0, 840 .fields = (VMStateField[]) { 841 VMSTATE_UINT8(emc_num, NPCM7xxEMCState), 842 VMSTATE_UINT32_ARRAY(regs, NPCM7xxEMCState, NPCM7XX_NUM_EMC_REGS), 843 VMSTATE_BOOL(tx_active, NPCM7xxEMCState), 844 VMSTATE_BOOL(rx_active, NPCM7xxEMCState), 845 VMSTATE_END_OF_LIST(), 846 }, 847 }; 848 849 static Property npcm7xx_emc_properties[] = { 850 DEFINE_NIC_PROPERTIES(NPCM7xxEMCState, conf), 851 DEFINE_PROP_END_OF_LIST(), 852 }; 853 854 static void npcm7xx_emc_class_init(ObjectClass *klass, void *data) 855 { 856 DeviceClass *dc = DEVICE_CLASS(klass); 857 858 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); 859 dc->desc = "NPCM7xx EMC Controller"; 860 dc->realize = npcm7xx_emc_realize; 861 dc->unrealize = npcm7xx_emc_unrealize; 862 dc->reset = npcm7xx_emc_reset; 863 dc->vmsd = &vmstate_npcm7xx_emc; 864 device_class_set_props(dc, npcm7xx_emc_properties); 865 } 866 867 static const TypeInfo npcm7xx_emc_info = { 868 .name = TYPE_NPCM7XX_EMC, 869 .parent = TYPE_SYS_BUS_DEVICE, 870 .instance_size = sizeof(NPCM7xxEMCState), 871 .class_init = npcm7xx_emc_class_init, 872 }; 873 874 static void npcm7xx_emc_register_type(void) 875 { 876 type_register_static(&npcm7xx_emc_info); 877 } 878 879 type_init(npcm7xx_emc_register_type) 880