1 /* 2 * CAN device - SJA1000 chip emulation for QEMU 3 * 4 * Copyright (c) 2013-2014 Jin Yang 5 * Copyright (c) 2014-2018 Pavel Pisa 6 * 7 * Initial development supported by Google GSoC 2013 from RTEMS project slot 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining a copy 10 * of this software and associated documentation files (the "Software"), to deal 11 * in the Software without restriction, including without limitation the rights 12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 13 * copies of the Software, and to permit persons to whom the Software is 14 * furnished to do so, subject to the following conditions: 15 * 16 * The above copyright notice and this permission notice shall be included in 17 * all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 25 * THE SOFTWARE. 26 */ 27 28 #include "qemu/osdep.h" 29 #include "qemu/log.h" 30 #include "chardev/char.h" 31 #include "hw/irq.h" 32 #include "migration/vmstate.h" 33 #include "net/can_emu.h" 34 35 #include "can_sja1000.h" 36 37 #ifndef DEBUG_FILTER 38 #define DEBUG_FILTER 0 39 #endif /*DEBUG_FILTER*/ 40 41 #ifndef DEBUG_CAN 42 #define DEBUG_CAN 0 43 #endif /*DEBUG_CAN*/ 44 45 #define DPRINTF(fmt, ...) \ 46 do { \ 47 if (DEBUG_CAN) { \ 48 qemu_log("[cansja]: " fmt , ## __VA_ARGS__); \ 49 } \ 50 } while (0) 51 52 static void can_sja_software_reset(CanSJA1000State *s) 53 { 54 s->mode &= ~0x31; 55 s->mode |= 0x01; 56 s->status_pel &= ~0x37; 57 s->status_pel |= 0x34; 58 59 s->rxbuf_start = 0x00; 60 s->rxmsg_cnt = 0x00; 61 s->rx_cnt = 0x00; 62 } 63 64 void can_sja_hardware_reset(CanSJA1000State *s) 65 { 66 /* Reset by hardware, p10 */ 67 s->mode = 0x01; 68 s->status_pel = 0x3c; 69 s->interrupt_pel = 0x00; 70 s->clock = 0x00; 71 s->rxbuf_start = 0x00; 72 s->rxmsg_cnt = 0x00; 73 s->rx_cnt = 0x00; 74 75 s->control = 0x01; 76 s->status_bas = 0x0c; 77 s->interrupt_bas = 0x00; 78 79 qemu_irq_lower(s->irq); 80 } 81 82 static 83 void can_sja_single_filter(struct qemu_can_filter *filter, 84 const uint8_t *acr, const uint8_t *amr, int extended) 85 { 86 if (extended) { 87 filter->can_id = (uint32_t)acr[0] << 21; 88 filter->can_id |= (uint32_t)acr[1] << 13; 89 filter->can_id |= (uint32_t)acr[2] << 5; 90 filter->can_id |= (uint32_t)acr[3] >> 3; 91 if (acr[3] & 4) { 92 filter->can_id |= QEMU_CAN_RTR_FLAG; 93 } 94 95 filter->can_mask = (uint32_t)amr[0] << 21; 96 filter->can_mask |= (uint32_t)amr[1] << 13; 97 filter->can_mask |= (uint32_t)amr[2] << 5; 98 filter->can_mask |= (uint32_t)amr[3] >> 3; 99 filter->can_mask = ~filter->can_mask & QEMU_CAN_EFF_MASK; 100 if (!(amr[3] & 4)) { 101 filter->can_mask |= QEMU_CAN_RTR_FLAG; 102 } 103 } else { 104 filter->can_id = (uint32_t)acr[0] << 3; 105 filter->can_id |= (uint32_t)acr[1] >> 5; 106 if (acr[1] & 0x10) { 107 filter->can_id |= QEMU_CAN_RTR_FLAG; 108 } 109 110 filter->can_mask = (uint32_t)amr[0] << 3; 111 filter->can_mask |= (uint32_t)amr[1] << 5; 112 filter->can_mask = ~filter->can_mask & QEMU_CAN_SFF_MASK; 113 if (!(amr[1] & 0x10)) { 114 filter->can_mask |= QEMU_CAN_RTR_FLAG; 115 } 116 } 117 } 118 119 static 120 void can_sja_dual_filter(struct qemu_can_filter *filter, 121 const uint8_t *acr, const uint8_t *amr, int extended) 122 { 123 if (extended) { 124 filter->can_id = (uint32_t)acr[0] << 21; 125 filter->can_id |= (uint32_t)acr[1] << 13; 126 127 filter->can_mask = (uint32_t)amr[0] << 21; 128 filter->can_mask |= (uint32_t)amr[1] << 13; 129 filter->can_mask = ~filter->can_mask & QEMU_CAN_EFF_MASK & ~0x1fff; 130 } else { 131 filter->can_id = (uint32_t)acr[0] << 3; 132 filter->can_id |= (uint32_t)acr[1] >> 5; 133 if (acr[1] & 0x10) { 134 filter->can_id |= QEMU_CAN_RTR_FLAG; 135 } 136 137 filter->can_mask = (uint32_t)amr[0] << 3; 138 filter->can_mask |= (uint32_t)amr[1] >> 5; 139 filter->can_mask = ~filter->can_mask & QEMU_CAN_SFF_MASK; 140 if (!(amr[1] & 0x10)) { 141 filter->can_mask |= QEMU_CAN_RTR_FLAG; 142 } 143 } 144 } 145 146 /* Details in DS-p22, what we need to do here is to test the data. */ 147 static 148 int can_sja_accept_filter(CanSJA1000State *s, 149 const qemu_can_frame *frame) 150 { 151 152 struct qemu_can_filter filter; 153 154 if (s->clock & 0x80) { /* PeliCAN Mode */ 155 if (s->mode & (1 << 3)) { /* Single mode. */ 156 if (frame->can_id & QEMU_CAN_EFF_FLAG) { /* EFF */ 157 can_sja_single_filter(&filter, 158 s->code_mask + 0, s->code_mask + 4, 1); 159 160 if (!can_bus_filter_match(&filter, frame->can_id)) { 161 return 0; 162 } 163 } else { /* SFF */ 164 can_sja_single_filter(&filter, 165 s->code_mask + 0, s->code_mask + 4, 0); 166 167 if (!can_bus_filter_match(&filter, frame->can_id)) { 168 return 0; 169 } 170 171 if (frame->can_id & QEMU_CAN_RTR_FLAG) { /* RTR */ 172 return 1; 173 } 174 175 if (frame->can_dlc == 0) { 176 return 1; 177 } 178 179 if ((frame->data[0] & ~(s->code_mask[6])) != 180 (s->code_mask[2] & ~(s->code_mask[6]))) { 181 return 0; 182 } 183 184 if (frame->can_dlc < 2) { 185 return 1; 186 } 187 188 if ((frame->data[1] & ~(s->code_mask[7])) == 189 (s->code_mask[3] & ~(s->code_mask[7]))) { 190 return 1; 191 } 192 193 return 0; 194 } 195 } else { /* Dual mode */ 196 if (frame->can_id & QEMU_CAN_EFF_FLAG) { /* EFF */ 197 can_sja_dual_filter(&filter, 198 s->code_mask + 0, s->code_mask + 4, 1); 199 200 if (can_bus_filter_match(&filter, frame->can_id)) { 201 return 1; 202 } 203 204 can_sja_dual_filter(&filter, 205 s->code_mask + 2, s->code_mask + 6, 1); 206 207 if (can_bus_filter_match(&filter, frame->can_id)) { 208 return 1; 209 } 210 211 return 0; 212 } else { 213 can_sja_dual_filter(&filter, 214 s->code_mask + 0, s->code_mask + 4, 0); 215 216 if (can_bus_filter_match(&filter, frame->can_id)) { 217 uint8_t expect; 218 uint8_t mask; 219 expect = s->code_mask[1] << 4; 220 expect |= s->code_mask[3] & 0x0f; 221 222 mask = s->code_mask[5] << 4; 223 mask |= s->code_mask[7] & 0x0f; 224 mask = ~mask & 0xff; 225 226 if ((frame->data[0] & mask) == 227 (expect & mask)) { 228 return 1; 229 } 230 } 231 232 can_sja_dual_filter(&filter, 233 s->code_mask + 2, s->code_mask + 6, 0); 234 235 if (can_bus_filter_match(&filter, frame->can_id)) { 236 return 1; 237 } 238 239 return 0; 240 } 241 } 242 } 243 244 return 1; 245 } 246 247 static void can_display_msg(const char *prefix, const qemu_can_frame *msg) 248 { 249 int i; 250 FILE *logfile = qemu_log_lock(); 251 252 qemu_log("%s%03X [%01d] %s %s", 253 prefix, 254 msg->can_id & QEMU_CAN_EFF_MASK, 255 msg->can_dlc, 256 msg->can_id & QEMU_CAN_EFF_FLAG ? "EFF" : "SFF", 257 msg->can_id & QEMU_CAN_RTR_FLAG ? "RTR" : "DAT"); 258 259 for (i = 0; i < msg->can_dlc; i++) { 260 qemu_log(" %02X", msg->data[i]); 261 } 262 qemu_log("\n"); 263 qemu_log_flush(); 264 qemu_log_unlock(logfile); 265 } 266 267 static void buff2frame_pel(const uint8_t *buff, qemu_can_frame *frame) 268 { 269 uint8_t i; 270 271 frame->flags = 0; 272 frame->can_id = 0; 273 if (buff[0] & 0x40) { /* RTR */ 274 frame->can_id = QEMU_CAN_RTR_FLAG; 275 } 276 frame->can_dlc = buff[0] & 0x0f; 277 278 if (frame->can_dlc > 8) { 279 frame->can_dlc = 8; 280 } 281 282 if (buff[0] & 0x80) { /* Extended */ 283 frame->can_id |= QEMU_CAN_EFF_FLAG; 284 frame->can_id |= buff[1] << 21; /* ID.28~ID.21 */ 285 frame->can_id |= buff[2] << 13; /* ID.20~ID.13 */ 286 frame->can_id |= buff[3] << 5; 287 frame->can_id |= buff[4] >> 3; 288 for (i = 0; i < frame->can_dlc; i++) { 289 frame->data[i] = buff[5 + i]; 290 } 291 for (; i < 8; i++) { 292 frame->data[i] = 0; 293 } 294 } else { 295 frame->can_id |= buff[1] << 3; 296 frame->can_id |= buff[2] >> 5; 297 for (i = 0; i < frame->can_dlc; i++) { 298 frame->data[i] = buff[3 + i]; 299 } 300 for (; i < 8; i++) { 301 frame->data[i] = 0; 302 } 303 } 304 } 305 306 307 static void buff2frame_bas(const uint8_t *buff, qemu_can_frame *frame) 308 { 309 uint8_t i; 310 311 frame->flags = 0; 312 frame->can_id = ((buff[0] << 3) & (0xff << 3)) + ((buff[1] >> 5) & 0x07); 313 if (buff[1] & 0x10) { /* RTR */ 314 frame->can_id = QEMU_CAN_RTR_FLAG; 315 } 316 frame->can_dlc = buff[1] & 0x0f; 317 318 if (frame->can_dlc > 8) { 319 frame->can_dlc = 8; 320 } 321 322 for (i = 0; i < frame->can_dlc; i++) { 323 frame->data[i] = buff[2 + i]; 324 } 325 for (; i < 8; i++) { 326 frame->data[i] = 0; 327 } 328 } 329 330 331 static int frame2buff_pel(const qemu_can_frame *frame, uint8_t *buff) 332 { 333 int i; 334 int dlen = frame->can_dlc; 335 336 if (frame->can_id & QEMU_CAN_ERR_FLAG) { /* error frame, NOT support now. */ 337 return -1; 338 } 339 340 if (dlen > 8) { 341 return -1; 342 } 343 344 buff[0] = 0x0f & frame->can_dlc; /* DLC */ 345 if (frame->can_id & QEMU_CAN_RTR_FLAG) { /* RTR */ 346 buff[0] |= (1 << 6); 347 } 348 if (frame->can_id & QEMU_CAN_EFF_FLAG) { /* EFF */ 349 buff[0] |= (1 << 7); 350 buff[1] = extract32(frame->can_id, 21, 8); /* ID.28~ID.21 */ 351 buff[2] = extract32(frame->can_id, 13, 8); /* ID.20~ID.13 */ 352 buff[3] = extract32(frame->can_id, 5, 8); /* ID.12~ID.05 */ 353 buff[4] = extract32(frame->can_id, 0, 5) << 3; /* ID.04~ID.00,xxx */ 354 for (i = 0; i < dlen; i++) { 355 buff[5 + i] = frame->data[i]; 356 } 357 return dlen + 5; 358 } else { /* SFF */ 359 buff[1] = extract32(frame->can_id, 3, 8); /* ID.10~ID.03 */ 360 buff[2] = extract32(frame->can_id, 0, 3) << 5; /* ID.02~ID.00,xxxxx */ 361 for (i = 0; i < dlen; i++) { 362 buff[3 + i] = frame->data[i]; 363 } 364 365 return dlen + 3; 366 } 367 368 return -1; 369 } 370 371 static int frame2buff_bas(const qemu_can_frame *frame, uint8_t *buff) 372 { 373 int i; 374 int dlen = frame->can_dlc; 375 376 /* 377 * EFF, no support for BasicMode 378 * No use for Error frames now, 379 * they could be used in future to update SJA1000 error state 380 */ 381 if ((frame->can_id & QEMU_CAN_EFF_FLAG) || 382 (frame->can_id & QEMU_CAN_ERR_FLAG)) { 383 return -1; 384 } 385 386 if (dlen > 8) { 387 return -1; 388 } 389 390 buff[0] = extract32(frame->can_id, 3, 8); /* ID.10~ID.03 */ 391 buff[1] = extract32(frame->can_id, 0, 3) << 5; /* ID.02~ID.00,xxxxx */ 392 if (frame->can_id & QEMU_CAN_RTR_FLAG) { /* RTR */ 393 buff[1] |= (1 << 4); 394 } 395 buff[1] |= frame->can_dlc & 0x0f; 396 for (i = 0; i < dlen; i++) { 397 buff[2 + i] = frame->data[i]; 398 } 399 400 return dlen + 2; 401 } 402 403 static void can_sja_update_pel_irq(CanSJA1000State *s) 404 { 405 if (s->interrupt_en & s->interrupt_pel) { 406 qemu_irq_raise(s->irq); 407 } else { 408 qemu_irq_lower(s->irq); 409 } 410 } 411 412 static void can_sja_update_bas_irq(CanSJA1000State *s) 413 { 414 if ((s->control >> 1) & s->interrupt_bas) { 415 qemu_irq_raise(s->irq); 416 } else { 417 qemu_irq_lower(s->irq); 418 } 419 } 420 421 void can_sja_mem_write(CanSJA1000State *s, hwaddr addr, uint64_t val, 422 unsigned size) 423 { 424 qemu_can_frame frame; 425 uint32_t tmp; 426 uint8_t tmp8, count; 427 428 429 DPRINTF("write 0x%02llx addr 0x%02x\n", 430 (unsigned long long)val, (unsigned int)addr); 431 432 if (addr > CAN_SJA_MEM_SIZE) { 433 return ; 434 } 435 436 if (s->clock & 0x80) { /* PeliCAN Mode */ 437 switch (addr) { 438 case SJA_MOD: /* Mode register */ 439 s->mode = 0x1f & val; 440 if ((s->mode & 0x01) && ((val & 0x01) == 0)) { 441 /* Go to operation mode from reset mode. */ 442 if (s->mode & (1 << 3)) { /* Single mode. */ 443 /* For EFF */ 444 can_sja_single_filter(&s->filter[0], 445 s->code_mask + 0, s->code_mask + 4, 1); 446 447 /* For SFF */ 448 can_sja_single_filter(&s->filter[1], 449 s->code_mask + 0, s->code_mask + 4, 0); 450 451 can_bus_client_set_filters(&s->bus_client, s->filter, 2); 452 } else { /* Dual mode */ 453 /* For EFF */ 454 can_sja_dual_filter(&s->filter[0], 455 s->code_mask + 0, s->code_mask + 4, 1); 456 457 can_sja_dual_filter(&s->filter[1], 458 s->code_mask + 2, s->code_mask + 6, 1); 459 460 /* For SFF */ 461 can_sja_dual_filter(&s->filter[2], 462 s->code_mask + 0, s->code_mask + 4, 0); 463 464 can_sja_dual_filter(&s->filter[3], 465 s->code_mask + 2, s->code_mask + 6, 0); 466 467 can_bus_client_set_filters(&s->bus_client, s->filter, 4); 468 } 469 470 s->rxmsg_cnt = 0; 471 s->rx_cnt = 0; 472 } 473 break; 474 475 case SJA_CMR: /* Command register. */ 476 if (0x01 & val) { /* Send transmission request. */ 477 buff2frame_pel(s->tx_buff, &frame); 478 if (DEBUG_FILTER) { 479 can_display_msg("[cansja]: Tx request " , &frame); 480 } 481 482 /* 483 * Clear transmission complete status, 484 * and Transmit Buffer Status. 485 * write to the backends. 486 */ 487 s->status_pel &= ~(3 << 2); 488 489 can_bus_client_send(&s->bus_client, &frame, 1); 490 491 /* 492 * Set transmission complete status 493 * and Transmit Buffer Status. 494 */ 495 s->status_pel |= (3 << 2); 496 497 /* Clear transmit status. */ 498 s->status_pel &= ~(1 << 5); 499 s->interrupt_pel |= 0x02; 500 can_sja_update_pel_irq(s); 501 } 502 if (0x04 & val) { /* Release Receive Buffer */ 503 if (s->rxmsg_cnt <= 0) { 504 break; 505 } 506 507 tmp8 = s->rx_buff[s->rxbuf_start]; count = 0; 508 if (tmp8 & (1 << 7)) { /* EFF */ 509 count += 2; 510 } 511 count += 3; 512 if (!(tmp8 & (1 << 6))) { /* DATA */ 513 count += (tmp8 & 0x0f); 514 } 515 516 if (DEBUG_FILTER) { 517 qemu_log("[cansja]: message released from " 518 "Rx FIFO cnt=%d, count=%d\n", s->rx_cnt, count); 519 } 520 521 s->rxbuf_start += count; 522 s->rxbuf_start %= SJA_RCV_BUF_LEN; 523 524 s->rx_cnt -= count; 525 s->rxmsg_cnt--; 526 if (s->rxmsg_cnt == 0) { 527 s->status_pel &= ~(1 << 0); 528 s->interrupt_pel &= ~(1 << 0); 529 can_sja_update_pel_irq(s); 530 } 531 } 532 if (0x08 & val) { /* Clear data overrun */ 533 s->status_pel &= ~(1 << 1); 534 s->interrupt_pel &= ~(1 << 3); 535 can_sja_update_pel_irq(s); 536 } 537 break; 538 case SJA_SR: /* Status register */ 539 case SJA_IR: /* Interrupt register */ 540 break; /* Do nothing */ 541 case SJA_IER: /* Interrupt enable register */ 542 s->interrupt_en = val; 543 break; 544 case 16: /* RX frame information addr16-28. */ 545 s->status_pel |= (1 << 5); /* Set transmit status. */ 546 /* fallthrough */ 547 case 17 ... 28: 548 if (s->mode & 0x01) { /* Reset mode */ 549 if (addr < 24) { 550 s->code_mask[addr - 16] = val; 551 } 552 } else { /* Operation mode */ 553 s->tx_buff[addr - 16] = val; /* Store to TX buffer directly. */ 554 } 555 break; 556 case SJA_CDR: 557 s->clock = val; 558 break; 559 } 560 } else { /* Basic Mode */ 561 switch (addr) { 562 case SJA_BCAN_CTR: /* Control register, addr 0 */ 563 if ((s->control & 0x01) && ((val & 0x01) == 0)) { 564 /* Go to operation mode from reset mode. */ 565 s->filter[0].can_id = (s->code << 3) & (0xff << 3); 566 tmp = (~(s->mask << 3)) & (0xff << 3); 567 tmp |= QEMU_CAN_EFF_FLAG; /* Only Basic CAN Frame. */ 568 s->filter[0].can_mask = tmp; 569 can_bus_client_set_filters(&s->bus_client, s->filter, 1); 570 571 s->rxmsg_cnt = 0; 572 s->rx_cnt = 0; 573 } else if (!(s->control & 0x01) && !(val & 0x01)) { 574 can_sja_software_reset(s); 575 } 576 577 s->control = 0x1f & val; 578 break; 579 case SJA_BCAN_CMR: /* Command register, addr 1 */ 580 if (0x01 & val) { /* Send transmission request. */ 581 buff2frame_bas(s->tx_buff, &frame); 582 if (DEBUG_FILTER) { 583 can_display_msg("[cansja]: Tx request " , &frame); 584 } 585 586 /* 587 * Clear transmission complete status, 588 * and Transmit Buffer Status. 589 */ 590 s->status_bas &= ~(3 << 2); 591 592 /* write to the backends. */ 593 can_bus_client_send(&s->bus_client, &frame, 1); 594 595 /* 596 * Set transmission complete status, 597 * and Transmit Buffer Status. 598 */ 599 s->status_bas |= (3 << 2); 600 601 /* Clear transmit status. */ 602 s->status_bas &= ~(1 << 5); 603 s->interrupt_bas |= 0x02; 604 can_sja_update_bas_irq(s); 605 } 606 if (0x04 & val) { /* Release Receive Buffer */ 607 if (s->rxmsg_cnt <= 0) { 608 break; 609 } 610 611 tmp8 = s->rx_buff[(s->rxbuf_start + 1) % SJA_RCV_BUF_LEN]; 612 count = 2 + (tmp8 & 0x0f); 613 614 if (DEBUG_FILTER) { 615 qemu_log("[cansja]: message released from " 616 "Rx FIFO cnt=%d, count=%d\n", s->rx_cnt, count); 617 } 618 619 s->rxbuf_start += count; 620 s->rxbuf_start %= SJA_RCV_BUF_LEN; 621 s->rx_cnt -= count; 622 s->rxmsg_cnt--; 623 624 if (s->rxmsg_cnt == 0) { 625 s->status_bas &= ~(1 << 0); 626 s->interrupt_bas &= ~(1 << 0); 627 can_sja_update_bas_irq(s); 628 } 629 } 630 if (0x08 & val) { /* Clear data overrun */ 631 s->status_bas &= ~(1 << 1); 632 s->interrupt_bas &= ~(1 << 3); 633 can_sja_update_bas_irq(s); 634 } 635 break; 636 case 4: 637 s->code = val; 638 break; 639 case 5: 640 s->mask = val; 641 break; 642 case 10: 643 s->status_bas |= (1 << 5); /* Set transmit status. */ 644 /* fallthrough */ 645 case 11 ... 19: 646 if ((s->control & 0x01) == 0) { /* Operation mode */ 647 s->tx_buff[addr - 10] = val; /* Store to TX buffer directly. */ 648 } 649 break; 650 case SJA_CDR: 651 s->clock = val; 652 break; 653 } 654 } 655 } 656 657 uint64_t can_sja_mem_read(CanSJA1000State *s, hwaddr addr, unsigned size) 658 { 659 uint64_t temp = 0; 660 661 DPRINTF("read addr 0x%02x ...\n", (unsigned int)addr); 662 663 if (addr > CAN_SJA_MEM_SIZE) { 664 return 0; 665 } 666 667 if (s->clock & 0x80) { /* PeliCAN Mode */ 668 switch (addr) { 669 case SJA_MOD: /* Mode register, addr 0 */ 670 temp = s->mode; 671 break; 672 case SJA_CMR: /* Command register, addr 1 */ 673 temp = 0x00; /* Command register, cannot be read. */ 674 break; 675 case SJA_SR: /* Status register, addr 2 */ 676 temp = s->status_pel; 677 break; 678 case SJA_IR: /* Interrupt register, addr 3 */ 679 temp = s->interrupt_pel; 680 s->interrupt_pel = 0; 681 if (s->rxmsg_cnt) { 682 s->interrupt_pel |= (1 << 0); /* Receive interrupt. */ 683 } 684 can_sja_update_pel_irq(s); 685 break; 686 case SJA_IER: /* Interrupt enable register, addr 4 */ 687 temp = s->interrupt_en; 688 break; 689 case 5: /* Reserved */ 690 case 6: /* Bus timing 0, hardware related, not support now. */ 691 case 7: /* Bus timing 1, hardware related, not support now. */ 692 case 8: /* 693 * Output control register, hardware related, 694 * not supported for now. 695 */ 696 case 9: /* Test. */ 697 case 10 ... 15: /* Reserved */ 698 temp = 0x00; 699 break; 700 701 case 16 ... 28: 702 if (s->mode & 0x01) { /* Reset mode */ 703 if (addr < 24) { 704 temp = s->code_mask[addr - 16]; 705 } else { 706 temp = 0x00; 707 } 708 } else { /* Operation mode */ 709 temp = s->rx_buff[(s->rxbuf_start + addr - 16) % 710 SJA_RCV_BUF_LEN]; 711 } 712 break; 713 case SJA_CDR: 714 temp = s->clock; 715 break; 716 default: 717 temp = 0xff; 718 } 719 } else { /* Basic Mode */ 720 switch (addr) { 721 case SJA_BCAN_CTR: /* Control register, addr 0 */ 722 temp = s->control; 723 break; 724 case SJA_BCAN_SR: /* Status register, addr 2 */ 725 temp = s->status_bas; 726 break; 727 case SJA_BCAN_IR: /* Interrupt register, addr 3 */ 728 temp = s->interrupt_bas; 729 s->interrupt_bas = 0; 730 if (s->rxmsg_cnt) { 731 s->interrupt_bas |= (1 << 0); /* Receive interrupt. */ 732 } 733 can_sja_update_bas_irq(s); 734 break; 735 case 4: 736 temp = s->code; 737 break; 738 case 5: 739 temp = s->mask; 740 break; 741 case 20 ... 29: 742 temp = s->rx_buff[(s->rxbuf_start + addr - 20) % SJA_RCV_BUF_LEN]; 743 break; 744 case 31: 745 temp = s->clock; 746 break; 747 default: 748 temp = 0xff; 749 break; 750 } 751 } 752 DPRINTF("read addr 0x%02x, %d bytes, content 0x%02lx\n", 753 (int)addr, size, (long unsigned int)temp); 754 755 return temp; 756 } 757 758 bool can_sja_can_receive(CanBusClientState *client) 759 { 760 CanSJA1000State *s = container_of(client, CanSJA1000State, bus_client); 761 762 if (s->clock & 0x80) { /* PeliCAN Mode */ 763 if (s->mode & 0x01) { /* reset mode. */ 764 return false; 765 } 766 } else { /* BasicCAN mode */ 767 if (s->control & 0x01) { 768 return false; 769 } 770 } 771 772 return true; /* always return true, when operation mode */ 773 } 774 775 ssize_t can_sja_receive(CanBusClientState *client, const qemu_can_frame *frames, 776 size_t frames_cnt) 777 { 778 CanSJA1000State *s = container_of(client, CanSJA1000State, bus_client); 779 static uint8_t rcv[SJA_MSG_MAX_LEN]; 780 int i; 781 int ret = -1; 782 const qemu_can_frame *frame = frames; 783 784 if (frames_cnt <= 0) { 785 return 0; 786 } 787 if (frame->flags & QEMU_CAN_FRMF_TYPE_FD) { 788 if (DEBUG_FILTER) { 789 can_display_msg("[cansja]: ignor fd frame ", frame); 790 } 791 return 1; 792 } 793 794 if (DEBUG_FILTER) { 795 can_display_msg("[cansja]: receive ", frame); 796 } 797 798 if (s->clock & 0x80) { /* PeliCAN Mode */ 799 800 /* the CAN controller is receiving a message */ 801 s->status_pel |= (1 << 4); 802 803 if (can_sja_accept_filter(s, frame) == 0) { 804 s->status_pel &= ~(1 << 4); 805 if (DEBUG_FILTER) { 806 qemu_log("[cansja]: filter rejects message\n"); 807 } 808 return ret; 809 } 810 811 ret = frame2buff_pel(frame, rcv); 812 if (ret < 0) { 813 s->status_pel &= ~(1 << 4); 814 if (DEBUG_FILTER) { 815 qemu_log("[cansja]: message store failed\n"); 816 } 817 return ret; /* maybe not support now. */ 818 } 819 820 if (s->rx_cnt + ret > SJA_RCV_BUF_LEN) { /* Data overrun. */ 821 s->status_pel |= (1 << 1); /* Overrun status */ 822 s->interrupt_pel |= (1 << 3); 823 s->status_pel &= ~(1 << 4); 824 if (DEBUG_FILTER) { 825 qemu_log("[cansja]: receive FIFO overrun\n"); 826 } 827 can_sja_update_pel_irq(s); 828 return ret; 829 } 830 s->rx_cnt += ret; 831 s->rxmsg_cnt++; 832 if (DEBUG_FILTER) { 833 qemu_log("[cansja]: message stored in receive FIFO\n"); 834 } 835 836 for (i = 0; i < ret; i++) { 837 s->rx_buff[(s->rx_ptr++) % SJA_RCV_BUF_LEN] = rcv[i]; 838 } 839 s->rx_ptr %= SJA_RCV_BUF_LEN; /* update the pointer. */ 840 841 s->status_pel |= 0x01; /* Set the Receive Buffer Status. DS-p23 */ 842 s->interrupt_pel |= 0x01; 843 s->status_pel &= ~(1 << 4); 844 s->status_pel |= (1 << 0); 845 can_sja_update_pel_irq(s); 846 } else { /* BasicCAN mode */ 847 848 /* the CAN controller is receiving a message */ 849 s->status_bas |= (1 << 4); 850 851 ret = frame2buff_bas(frame, rcv); 852 if (ret < 0) { 853 s->status_bas &= ~(1 << 4); 854 if (DEBUG_FILTER) { 855 qemu_log("[cansja]: message store failed\n"); 856 } 857 return ret; /* maybe not support now. */ 858 } 859 860 if (s->rx_cnt + ret > SJA_RCV_BUF_LEN) { /* Data overrun. */ 861 s->status_bas |= (1 << 1); /* Overrun status */ 862 s->status_bas &= ~(1 << 4); 863 s->interrupt_bas |= (1 << 3); 864 can_sja_update_bas_irq(s); 865 if (DEBUG_FILTER) { 866 qemu_log("[cansja]: receive FIFO overrun\n"); 867 } 868 return ret; 869 } 870 s->rx_cnt += ret; 871 s->rxmsg_cnt++; 872 873 if (DEBUG_FILTER) { 874 qemu_log("[cansja]: message stored\n"); 875 } 876 877 for (i = 0; i < ret; i++) { 878 s->rx_buff[(s->rx_ptr++) % SJA_RCV_BUF_LEN] = rcv[i]; 879 } 880 s->rx_ptr %= SJA_RCV_BUF_LEN; /* update the pointer. */ 881 882 s->status_bas |= 0x01; /* Set the Receive Buffer Status. DS-p15 */ 883 s->status_bas &= ~(1 << 4); 884 s->interrupt_bas |= (1 << 0); 885 can_sja_update_bas_irq(s); 886 } 887 return 1; 888 } 889 890 static CanBusClientInfo can_sja_bus_client_info = { 891 .can_receive = can_sja_can_receive, 892 .receive = can_sja_receive, 893 }; 894 895 896 int can_sja_connect_to_bus(CanSJA1000State *s, CanBusState *bus) 897 { 898 s->bus_client.info = &can_sja_bus_client_info; 899 900 if (!bus) { 901 return -EINVAL; 902 } 903 904 if (can_bus_insert_client(bus, &s->bus_client) < 0) { 905 return -1; 906 } 907 908 return 0; 909 } 910 911 void can_sja_disconnect(CanSJA1000State *s) 912 { 913 can_bus_remove_client(&s->bus_client); 914 } 915 916 int can_sja_init(CanSJA1000State *s, qemu_irq irq) 917 { 918 s->irq = irq; 919 920 qemu_irq_lower(s->irq); 921 922 can_sja_hardware_reset(s); 923 924 return 0; 925 } 926 927 const VMStateDescription vmstate_qemu_can_filter = { 928 .name = "qemu_can_filter", 929 .version_id = 1, 930 .minimum_version_id = 1, 931 .fields = (VMStateField[]) { 932 VMSTATE_UINT32(can_id, qemu_can_filter), 933 VMSTATE_UINT32(can_mask, qemu_can_filter), 934 VMSTATE_END_OF_LIST() 935 } 936 }; 937 938 static int can_sja_post_load(void *opaque, int version_id) 939 { 940 CanSJA1000State *s = opaque; 941 if (s->clock & 0x80) { /* PeliCAN Mode */ 942 can_sja_update_pel_irq(s); 943 } else { 944 can_sja_update_bas_irq(s); 945 } 946 return 0; 947 } 948 949 /* VMState is needed for live migration of QEMU images */ 950 const VMStateDescription vmstate_can_sja = { 951 .name = "can_sja", 952 .version_id = 1, 953 .minimum_version_id = 1, 954 .post_load = can_sja_post_load, 955 .fields = (VMStateField[]) { 956 VMSTATE_UINT8(mode, CanSJA1000State), 957 958 VMSTATE_UINT8(status_pel, CanSJA1000State), 959 VMSTATE_UINT8(interrupt_pel, CanSJA1000State), 960 VMSTATE_UINT8(interrupt_en, CanSJA1000State), 961 VMSTATE_UINT8(rxmsg_cnt, CanSJA1000State), 962 VMSTATE_UINT8(rxbuf_start, CanSJA1000State), 963 VMSTATE_UINT8(clock, CanSJA1000State), 964 965 VMSTATE_BUFFER(code_mask, CanSJA1000State), 966 VMSTATE_BUFFER(tx_buff, CanSJA1000State), 967 968 VMSTATE_BUFFER(rx_buff, CanSJA1000State), 969 970 VMSTATE_UINT32(rx_ptr, CanSJA1000State), 971 VMSTATE_UINT32(rx_cnt, CanSJA1000State), 972 973 VMSTATE_UINT8(control, CanSJA1000State), 974 975 VMSTATE_UINT8(status_bas, CanSJA1000State), 976 VMSTATE_UINT8(interrupt_bas, CanSJA1000State), 977 VMSTATE_UINT8(code, CanSJA1000State), 978 VMSTATE_UINT8(mask, CanSJA1000State), 979 980 VMSTATE_STRUCT_ARRAY(filter, CanSJA1000State, 4, 0, 981 vmstate_qemu_can_filter, qemu_can_filter), 982 983 984 VMSTATE_END_OF_LIST() 985 } 986 }; 987