1 /* 2 * OMAP on-chip MMC/SD host emulation. 3 * 4 * Datasheet: TI Multimedia Card (MMC/SD/SDIO) Interface (SPRU765A) 5 * 6 * Copyright (C) 2006-2007 Andrzej Zaborowski <balrog@zabor.org> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 or 11 * (at your option) version 3 of the License. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, see <http://www.gnu.org/licenses/>. 20 */ 21 22 #include "qemu/osdep.h" 23 #include "qemu/log.h" 24 #include "hw/irq.h" 25 #include "hw/arm/omap.h" 26 #include "hw/sd/sd.h" 27 28 struct omap_mmc_s { 29 qemu_irq irq; 30 qemu_irq *dma; 31 qemu_irq coverswitch; 32 MemoryRegion iomem; 33 omap_clk clk; 34 SDState *card; 35 uint16_t last_cmd; 36 uint16_t sdio; 37 uint16_t rsp[8]; 38 uint32_t arg; 39 int lines; 40 int dw; 41 int mode; 42 int enable; 43 int be; 44 int rev; 45 uint16_t status; 46 uint16_t mask; 47 uint8_t cto; 48 uint16_t dto; 49 int clkdiv; 50 uint16_t fifo[32]; 51 int fifo_start; 52 int fifo_len; 53 uint16_t blen; 54 uint16_t blen_counter; 55 uint16_t nblk; 56 uint16_t nblk_counter; 57 int tx_dma; 58 int rx_dma; 59 int af_level; 60 int ae_level; 61 62 int ddir; 63 int transfer; 64 65 int cdet_wakeup; 66 int cdet_enable; 67 int cdet_state; 68 qemu_irq cdet; 69 }; 70 71 static void omap_mmc_interrupts_update(struct omap_mmc_s *s) 72 { 73 qemu_set_irq(s->irq, !!(s->status & s->mask)); 74 } 75 76 static void omap_mmc_fifolevel_update(struct omap_mmc_s *host) 77 { 78 if (!host->transfer && !host->fifo_len) { 79 host->status &= 0xf3ff; 80 return; 81 } 82 83 if (host->fifo_len > host->af_level && host->ddir) { 84 if (host->rx_dma) { 85 host->status &= 0xfbff; 86 qemu_irq_raise(host->dma[1]); 87 } else 88 host->status |= 0x0400; 89 } else { 90 host->status &= 0xfbff; 91 qemu_irq_lower(host->dma[1]); 92 } 93 94 if (host->fifo_len < host->ae_level && !host->ddir) { 95 if (host->tx_dma) { 96 host->status &= 0xf7ff; 97 qemu_irq_raise(host->dma[0]); 98 } else 99 host->status |= 0x0800; 100 } else { 101 qemu_irq_lower(host->dma[0]); 102 host->status &= 0xf7ff; 103 } 104 } 105 106 typedef enum { 107 sd_nore = 0, /* no response */ 108 sd_r1, /* normal response command */ 109 sd_r2, /* CID, CSD registers */ 110 sd_r3, /* OCR register */ 111 sd_r6 = 6, /* Published RCA response */ 112 sd_r1b = -1, 113 } sd_rsp_type_t; 114 115 static void omap_mmc_command(struct omap_mmc_s *host, int cmd, int dir, 116 sd_cmd_type_t type, int busy, sd_rsp_type_t resptype, int init) 117 { 118 uint32_t rspstatus, mask; 119 int rsplen, timeout; 120 SDRequest request; 121 uint8_t response[16]; 122 123 if (init && cmd == 0) { 124 host->status |= 0x0001; 125 return; 126 } 127 128 if (resptype == sd_r1 && busy) 129 resptype = sd_r1b; 130 131 if (type == sd_adtc) { 132 host->fifo_start = 0; 133 host->fifo_len = 0; 134 host->transfer = 1; 135 host->ddir = dir; 136 } else 137 host->transfer = 0; 138 timeout = 0; 139 mask = 0; 140 rspstatus = 0; 141 142 request.cmd = cmd; 143 request.arg = host->arg; 144 request.crc = 0; /* FIXME */ 145 146 rsplen = sd_do_command(host->card, &request, response); 147 148 /* TODO: validate CRCs */ 149 switch (resptype) { 150 case sd_nore: 151 rsplen = 0; 152 break; 153 154 case sd_r1: 155 case sd_r1b: 156 if (rsplen < 4) { 157 timeout = 1; 158 break; 159 } 160 rsplen = 4; 161 162 mask = OUT_OF_RANGE | ADDRESS_ERROR | BLOCK_LEN_ERROR | 163 ERASE_SEQ_ERROR | ERASE_PARAM | WP_VIOLATION | 164 LOCK_UNLOCK_FAILED | COM_CRC_ERROR | ILLEGAL_COMMAND | 165 CARD_ECC_FAILED | CC_ERROR | SD_ERROR | 166 CID_CSD_OVERWRITE; 167 if (host->sdio & (1 << 13)) 168 mask |= AKE_SEQ_ERROR; 169 rspstatus = ldl_be_p(response); 170 break; 171 172 case sd_r2: 173 if (rsplen < 16) { 174 timeout = 1; 175 break; 176 } 177 rsplen = 16; 178 break; 179 180 case sd_r3: 181 if (rsplen < 4) { 182 timeout = 1; 183 break; 184 } 185 rsplen = 4; 186 187 rspstatus = ldl_be_p(response); 188 if (rspstatus & 0x80000000) 189 host->status &= 0xe000; 190 else 191 host->status |= 0x1000; 192 break; 193 194 case sd_r6: 195 if (rsplen < 4) { 196 timeout = 1; 197 break; 198 } 199 rsplen = 4; 200 201 mask = 0xe000 | AKE_SEQ_ERROR; 202 rspstatus = (response[2] << 8) | (response[3] << 0); 203 } 204 205 if (rspstatus & mask) 206 host->status |= 0x4000; 207 else 208 host->status &= 0xb000; 209 210 if (rsplen) 211 for (rsplen = 0; rsplen < 8; rsplen ++) 212 host->rsp[~rsplen & 7] = response[(rsplen << 1) | 1] | 213 (response[(rsplen << 1) | 0] << 8); 214 215 if (timeout) 216 host->status |= 0x0080; 217 else if (cmd == 12) 218 host->status |= 0x0005; /* Makes it more real */ 219 else 220 host->status |= 0x0001; 221 } 222 223 static void omap_mmc_transfer(struct omap_mmc_s *host) 224 { 225 uint8_t value; 226 227 if (!host->transfer) 228 return; 229 230 while (1) { 231 if (host->ddir) { 232 if (host->fifo_len > host->af_level) 233 break; 234 235 value = sd_read_data(host->card); 236 host->fifo[(host->fifo_start + host->fifo_len) & 31] = value; 237 if (-- host->blen_counter) { 238 value = sd_read_data(host->card); 239 host->fifo[(host->fifo_start + host->fifo_len) & 31] |= 240 value << 8; 241 host->blen_counter --; 242 } 243 244 host->fifo_len ++; 245 } else { 246 if (!host->fifo_len) 247 break; 248 249 value = host->fifo[host->fifo_start] & 0xff; 250 sd_write_data(host->card, value); 251 if (-- host->blen_counter) { 252 value = host->fifo[host->fifo_start] >> 8; 253 sd_write_data(host->card, value); 254 host->blen_counter --; 255 } 256 257 host->fifo_start ++; 258 host->fifo_len --; 259 host->fifo_start &= 31; 260 } 261 262 if (host->blen_counter == 0) { 263 host->nblk_counter --; 264 host->blen_counter = host->blen; 265 266 if (host->nblk_counter == 0) { 267 host->nblk_counter = host->nblk; 268 host->transfer = 0; 269 host->status |= 0x0008; 270 break; 271 } 272 } 273 } 274 } 275 276 static void omap_mmc_update(void *opaque) 277 { 278 struct omap_mmc_s *s = opaque; 279 omap_mmc_transfer(s); 280 omap_mmc_fifolevel_update(s); 281 omap_mmc_interrupts_update(s); 282 } 283 284 static void omap_mmc_pseudo_reset(struct omap_mmc_s *host) 285 { 286 host->status = 0; 287 host->fifo_len = 0; 288 } 289 290 void omap_mmc_reset(struct omap_mmc_s *host) 291 { 292 host->last_cmd = 0; 293 memset(host->rsp, 0, sizeof(host->rsp)); 294 host->arg = 0; 295 host->dw = 0; 296 host->mode = 0; 297 host->enable = 0; 298 host->mask = 0; 299 host->cto = 0; 300 host->dto = 0; 301 host->blen = 0; 302 host->blen_counter = 0; 303 host->nblk = 0; 304 host->nblk_counter = 0; 305 host->tx_dma = 0; 306 host->rx_dma = 0; 307 host->ae_level = 0x00; 308 host->af_level = 0x1f; 309 host->transfer = 0; 310 host->cdet_wakeup = 0; 311 host->cdet_enable = 0; 312 qemu_set_irq(host->coverswitch, host->cdet_state); 313 host->clkdiv = 0; 314 315 omap_mmc_pseudo_reset(host); 316 317 /* Since we're still using the legacy SD API the card is not plugged 318 * into any bus, and we must reset it manually. When omap_mmc is 319 * QOMified this must move into the QOM reset function. 320 */ 321 device_legacy_reset(DEVICE(host->card)); 322 } 323 324 static uint64_t omap_mmc_read(void *opaque, hwaddr offset, 325 unsigned size) 326 { 327 uint16_t i; 328 struct omap_mmc_s *s = (struct omap_mmc_s *) opaque; 329 330 if (size != 2) { 331 return omap_badwidth_read16(opaque, offset); 332 } 333 334 switch (offset) { 335 case 0x00: /* MMC_CMD */ 336 return s->last_cmd; 337 338 case 0x04: /* MMC_ARGL */ 339 return s->arg & 0x0000ffff; 340 341 case 0x08: /* MMC_ARGH */ 342 return s->arg >> 16; 343 344 case 0x0c: /* MMC_CON */ 345 return (s->dw << 15) | (s->mode << 12) | (s->enable << 11) | 346 (s->be << 10) | s->clkdiv; 347 348 case 0x10: /* MMC_STAT */ 349 return s->status; 350 351 case 0x14: /* MMC_IE */ 352 return s->mask; 353 354 case 0x18: /* MMC_CTO */ 355 return s->cto; 356 357 case 0x1c: /* MMC_DTO */ 358 return s->dto; 359 360 case 0x20: /* MMC_DATA */ 361 /* TODO: support 8-bit access */ 362 i = s->fifo[s->fifo_start]; 363 if (s->fifo_len == 0) { 364 printf("MMC: FIFO underrun\n"); 365 return i; 366 } 367 s->fifo_start ++; 368 s->fifo_len --; 369 s->fifo_start &= 31; 370 omap_mmc_transfer(s); 371 omap_mmc_fifolevel_update(s); 372 omap_mmc_interrupts_update(s); 373 return i; 374 375 case 0x24: /* MMC_BLEN */ 376 return s->blen_counter; 377 378 case 0x28: /* MMC_NBLK */ 379 return s->nblk_counter; 380 381 case 0x2c: /* MMC_BUF */ 382 return (s->rx_dma << 15) | (s->af_level << 8) | 383 (s->tx_dma << 7) | s->ae_level; 384 385 case 0x30: /* MMC_SPI */ 386 return 0x0000; 387 case 0x34: /* MMC_SDIO */ 388 return (s->cdet_wakeup << 2) | (s->cdet_enable) | s->sdio; 389 case 0x38: /* MMC_SYST */ 390 return 0x0000; 391 392 case 0x3c: /* MMC_REV */ 393 return s->rev; 394 395 case 0x40: /* MMC_RSP0 */ 396 case 0x44: /* MMC_RSP1 */ 397 case 0x48: /* MMC_RSP2 */ 398 case 0x4c: /* MMC_RSP3 */ 399 case 0x50: /* MMC_RSP4 */ 400 case 0x54: /* MMC_RSP5 */ 401 case 0x58: /* MMC_RSP6 */ 402 case 0x5c: /* MMC_RSP7 */ 403 return s->rsp[(offset - 0x40) >> 2]; 404 405 /* OMAP2-specific */ 406 case 0x60: /* MMC_IOSR */ 407 case 0x64: /* MMC_SYSC */ 408 return 0; 409 case 0x68: /* MMC_SYSS */ 410 return 1; /* RSTD */ 411 } 412 413 OMAP_BAD_REG(offset); 414 return 0; 415 } 416 417 static void omap_mmc_write(void *opaque, hwaddr offset, 418 uint64_t value, unsigned size) 419 { 420 int i; 421 struct omap_mmc_s *s = (struct omap_mmc_s *) opaque; 422 423 if (size != 2) { 424 omap_badwidth_write16(opaque, offset, value); 425 return; 426 } 427 428 switch (offset) { 429 case 0x00: /* MMC_CMD */ 430 if (!s->enable) 431 break; 432 433 s->last_cmd = value; 434 for (i = 0; i < 8; i ++) 435 s->rsp[i] = 0x0000; 436 omap_mmc_command(s, value & 63, (value >> 15) & 1, 437 (sd_cmd_type_t) ((value >> 12) & 3), 438 (value >> 11) & 1, 439 (sd_rsp_type_t) ((value >> 8) & 7), 440 (value >> 7) & 1); 441 omap_mmc_update(s); 442 break; 443 444 case 0x04: /* MMC_ARGL */ 445 s->arg &= 0xffff0000; 446 s->arg |= 0x0000ffff & value; 447 break; 448 449 case 0x08: /* MMC_ARGH */ 450 s->arg &= 0x0000ffff; 451 s->arg |= value << 16; 452 break; 453 454 case 0x0c: /* MMC_CON */ 455 s->dw = (value >> 15) & 1; 456 s->mode = (value >> 12) & 3; 457 s->enable = (value >> 11) & 1; 458 s->be = (value >> 10) & 1; 459 s->clkdiv = (value >> 0) & (s->rev >= 2 ? 0x3ff : 0xff); 460 if (s->mode != 0) { 461 qemu_log_mask(LOG_UNIMP, 462 "omap_mmc_wr: mode #%i unimplemented\n", s->mode); 463 } 464 if (s->be != 0) { 465 qemu_log_mask(LOG_UNIMP, 466 "omap_mmc_wr: Big Endian not implemented\n"); 467 } 468 if (s->dw != 0 && s->lines < 4) 469 printf("4-bit SD bus enabled\n"); 470 if (!s->enable) 471 omap_mmc_pseudo_reset(s); 472 break; 473 474 case 0x10: /* MMC_STAT */ 475 s->status &= ~value; 476 omap_mmc_interrupts_update(s); 477 break; 478 479 case 0x14: /* MMC_IE */ 480 s->mask = value & 0x7fff; 481 omap_mmc_interrupts_update(s); 482 break; 483 484 case 0x18: /* MMC_CTO */ 485 s->cto = value & 0xff; 486 if (s->cto > 0xfd && s->rev <= 1) 487 printf("MMC: CTO of 0xff and 0xfe cannot be used!\n"); 488 break; 489 490 case 0x1c: /* MMC_DTO */ 491 s->dto = value & 0xffff; 492 break; 493 494 case 0x20: /* MMC_DATA */ 495 /* TODO: support 8-bit access */ 496 if (s->fifo_len == 32) 497 break; 498 s->fifo[(s->fifo_start + s->fifo_len) & 31] = value; 499 s->fifo_len ++; 500 omap_mmc_transfer(s); 501 omap_mmc_fifolevel_update(s); 502 omap_mmc_interrupts_update(s); 503 break; 504 505 case 0x24: /* MMC_BLEN */ 506 s->blen = (value & 0x07ff) + 1; 507 s->blen_counter = s->blen; 508 break; 509 510 case 0x28: /* MMC_NBLK */ 511 s->nblk = (value & 0x07ff) + 1; 512 s->nblk_counter = s->nblk; 513 s->blen_counter = s->blen; 514 break; 515 516 case 0x2c: /* MMC_BUF */ 517 s->rx_dma = (value >> 15) & 1; 518 s->af_level = (value >> 8) & 0x1f; 519 s->tx_dma = (value >> 7) & 1; 520 s->ae_level = value & 0x1f; 521 522 if (s->rx_dma) 523 s->status &= 0xfbff; 524 if (s->tx_dma) 525 s->status &= 0xf7ff; 526 omap_mmc_fifolevel_update(s); 527 omap_mmc_interrupts_update(s); 528 break; 529 530 /* SPI, SDIO and TEST modes unimplemented */ 531 case 0x30: /* MMC_SPI (OMAP1 only) */ 532 break; 533 case 0x34: /* MMC_SDIO */ 534 s->sdio = value & (s->rev >= 2 ? 0xfbf3 : 0x2020); 535 s->cdet_wakeup = (value >> 9) & 1; 536 s->cdet_enable = (value >> 2) & 1; 537 break; 538 case 0x38: /* MMC_SYST */ 539 break; 540 541 case 0x3c: /* MMC_REV */ 542 case 0x40: /* MMC_RSP0 */ 543 case 0x44: /* MMC_RSP1 */ 544 case 0x48: /* MMC_RSP2 */ 545 case 0x4c: /* MMC_RSP3 */ 546 case 0x50: /* MMC_RSP4 */ 547 case 0x54: /* MMC_RSP5 */ 548 case 0x58: /* MMC_RSP6 */ 549 case 0x5c: /* MMC_RSP7 */ 550 OMAP_RO_REG(offset); 551 break; 552 553 /* OMAP2-specific */ 554 case 0x60: /* MMC_IOSR */ 555 if (value & 0xf) 556 printf("MMC: SDIO bits used!\n"); 557 break; 558 case 0x64: /* MMC_SYSC */ 559 if (value & (1 << 2)) /* SRTS */ 560 omap_mmc_reset(s); 561 break; 562 case 0x68: /* MMC_SYSS */ 563 OMAP_RO_REG(offset); 564 break; 565 566 default: 567 OMAP_BAD_REG(offset); 568 } 569 } 570 571 static const MemoryRegionOps omap_mmc_ops = { 572 .read = omap_mmc_read, 573 .write = omap_mmc_write, 574 .endianness = DEVICE_NATIVE_ENDIAN, 575 }; 576 577 static void omap_mmc_cover_cb(void *opaque, int line, int level) 578 { 579 struct omap_mmc_s *host = (struct omap_mmc_s *) opaque; 580 581 if (!host->cdet_state && level) { 582 host->status |= 0x0002; 583 omap_mmc_interrupts_update(host); 584 if (host->cdet_wakeup) { 585 /* TODO: Assert wake-up */ 586 } 587 } 588 589 if (host->cdet_state != level) { 590 qemu_set_irq(host->coverswitch, level); 591 host->cdet_state = level; 592 } 593 } 594 595 struct omap_mmc_s *omap_mmc_init(hwaddr base, 596 MemoryRegion *sysmem, 597 BlockBackend *blk, 598 qemu_irq irq, qemu_irq dma[], omap_clk clk) 599 { 600 struct omap_mmc_s *s = g_new0(struct omap_mmc_s, 1); 601 602 s->irq = irq; 603 s->dma = dma; 604 s->clk = clk; 605 s->lines = 1; /* TODO: needs to be settable per-board */ 606 s->rev = 1; 607 608 memory_region_init_io(&s->iomem, NULL, &omap_mmc_ops, s, "omap.mmc", 0x800); 609 memory_region_add_subregion(sysmem, base, &s->iomem); 610 611 /* Instantiate the storage */ 612 s->card = sd_init(blk, false); 613 if (s->card == NULL) { 614 exit(1); 615 } 616 617 omap_mmc_reset(s); 618 619 return s; 620 } 621 622 struct omap_mmc_s *omap2_mmc_init(struct omap_target_agent_s *ta, 623 BlockBackend *blk, qemu_irq irq, qemu_irq dma[], 624 omap_clk fclk, omap_clk iclk) 625 { 626 struct omap_mmc_s *s = g_new0(struct omap_mmc_s, 1); 627 628 s->irq = irq; 629 s->dma = dma; 630 s->clk = fclk; 631 s->lines = 4; 632 s->rev = 2; 633 634 memory_region_init_io(&s->iomem, NULL, &omap_mmc_ops, s, "omap.mmc", 635 omap_l4_region_size(ta, 0)); 636 omap_l4_attach(ta, 0, &s->iomem); 637 638 /* Instantiate the storage */ 639 s->card = sd_init(blk, false); 640 if (s->card == NULL) { 641 exit(1); 642 } 643 644 s->cdet = qemu_allocate_irq(omap_mmc_cover_cb, s, 0); 645 sd_set_cb(s->card, NULL, s->cdet); 646 647 omap_mmc_reset(s); 648 649 return s; 650 } 651 652 void omap_mmc_handlers(struct omap_mmc_s *s, qemu_irq ro, qemu_irq cover) 653 { 654 if (s->cdet) { 655 sd_set_cb(s->card, ro, s->cdet); 656 s->coverswitch = cover; 657 qemu_set_irq(cover, s->cdet_state); 658 } else 659 sd_set_cb(s->card, ro, cover); 660 } 661 662 void omap_mmc_enable(struct omap_mmc_s *s, int enable) 663 { 664 sd_enable(s->card, enable); 665 } 666