hw/omap_mmc.c

   1 /*
   2  * OMAP on-chip MMC/SD host emulation.
   3  *
   4  * Copyright (C) 2006-2007 Andrzej Zaborowski  <balrog@zabor.org>
   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 or
   9  * (at your option) version 3 of the License.
  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 #include "hw.h"
  20 #include "omap.h"
  21 #include "sd.h"
  22
  23 struct omap_mmc_s {
  24     qemu_irq irq;
  25     qemu_irq *dma;
  26     qemu_irq coverswitch;
  27     omap_clk clk;
  28     SDState *card;
  29     uint16_t last_cmd;
  30     uint16_t sdio;
  31     uint16_t rsp[8];
  32     uint32_t arg;
  33     int lines;
  34     int dw;
  35     int mode;
  36     int enable;
  37     int be;
  38     int rev;
  39     uint16_t status;
  40     uint16_t mask;
  41     uint8_t cto;
  42     uint16_t dto;
  43     int clkdiv;
  44     uint16_t fifo[32];
  45     int fifo_start;
  46     int fifo_len;
  47     uint16_t blen;
  48     uint16_t blen_counter;
  49     uint16_t nblk;
  50     uint16_t nblk_counter;
  51     int tx_dma;
  52     int rx_dma;
  53     int af_level;
  54     int ae_level;
  55
  56     int ddir;
  57     int transfer;
  58
  59     int cdet_wakeup;
  60     int cdet_enable;
  61     int cdet_state;
  62     qemu_irq cdet;
  63 };
  64
  65 static void omap_mmc_interrupts_update(struct omap_mmc_s *s)
  66 {
  67     qemu_set_irq(s->irq, !!(s->status & s->mask));
  68 }
  69
  70 static void omap_mmc_fifolevel_update(struct omap_mmc_s *host)
  71 {
  72     if (!host->transfer && !host->fifo_len) {
  73         host->status &= 0xf3ff;
  74         return;
  75     }
  76
  77     if (host->fifo_len > host->af_level && host->ddir) {
  78         if (host->rx_dma) {
  79             host->status &= 0xfbff;
  80             qemu_irq_raise(host->dma[1]);
  81         } else
  82             host->status |= 0x0400;
  83     } else {
  84         host->status &= 0xfbff;
  85         qemu_irq_lower(host->dma[1]);
  86     }
  87
  88     if (host->fifo_len < host->ae_level && !host->ddir) {
  89         if (host->tx_dma) {
  90             host->status &= 0xf7ff;
  91             qemu_irq_raise(host->dma[0]);
  92         } else
  93             host->status |= 0x0800;
  94     } else {
  95         qemu_irq_lower(host->dma[0]);
  96         host->status &= 0xf7ff;
  97     }
  98 }
  99
 100 typedef enum {
 101     sd_nore = 0,        /* no response */
 102     sd_r1,              /* normal response command */
 103     sd_r2,              /* CID, CSD registers */
 104     sd_r3,              /* OCR register */
 105     sd_r6 = 6,          /* Published RCA response */
 106     sd_r1b = -1,
 107 } sd_rsp_type_t;
 108
 109 static void omap_mmc_command(struct omap_mmc_s *host, int cmd, int dir,
 110                 sd_cmd_type_t type, int busy, sd_rsp_type_t resptype, int init)
 111 {
 112     uint32_t rspstatus, mask;
 113     int rsplen, timeout;
 114     SDRequest request;
 115     uint8_t response[16];
 116
 117     if (init && cmd == 0) {
 118         host->status |= 0x0001;
 119         return;
 120     }
 121
 122     if (resptype == sd_r1 && busy)
 123         resptype = sd_r1b;
 124
 125     if (type == sd_adtc) {
 126         host->fifo_start = 0;
 127         host->fifo_len = 0;
 128         host->transfer = 1;
 129         host->ddir = dir;
 130     } else
 131         host->transfer = 0;
 132     timeout = 0;
 133     mask = 0;
 134     rspstatus = 0;
 135
 136     request.cmd = cmd;
 137     request.arg = host->arg;
 138     request.crc = 0; /* FIXME */
 139
 140     rsplen = sd_do_command(host->card, &request, response);
 141
 142     /* TODO: validate CRCs */
 143     switch (resptype) {
 144     case sd_nore:
 145         rsplen = 0;
 146         break;
 147
 148     case sd_r1:
 149     case sd_r1b:
 150         if (rsplen < 4) {
 151             timeout = 1;
 152             break;
 153         }
 154         rsplen = 4;
 155
 156         mask = OUT_OF_RANGE | ADDRESS_ERROR | BLOCK_LEN_ERROR |
 157                 ERASE_SEQ_ERROR | ERASE_PARAM | WP_VIOLATION |
 158                 LOCK_UNLOCK_FAILED | COM_CRC_ERROR | ILLEGAL_COMMAND |
 159                 CARD_ECC_FAILED | CC_ERROR | SD_ERROR |
 160                 CID_CSD_OVERWRITE;
 161         if (host->sdio & (1 << 13))
 162             mask |= AKE_SEQ_ERROR;
 163         rspstatus = (response[0] << 24) | (response[1] << 16) |
 164                 (response[2] << 8) | (response[3] << 0);
 165         break;
 166
 167     case sd_r2:
 168         if (rsplen < 16) {
 169             timeout = 1;
 170             break;
 171         }
 172         rsplen = 16;
 173         break;
 174
 175     case sd_r3:
 176         if (rsplen < 4) {
 177             timeout = 1;
 178             break;
 179         }
 180         rsplen = 4;
 181
 182         rspstatus = (response[0] << 24) | (response[1] << 16) |
 183                 (response[2] << 8) | (response[3] << 0);
 184         if (rspstatus & 0x80000000)
 185             host->status &= 0xe000;
 186         else
 187             host->status |= 0x1000;
 188         break;
 189
 190     case sd_r6:
 191         if (rsplen < 4) {
 192             timeout = 1;
 193             break;
 194         }
 195         rsplen = 4;
 196
 197         mask = 0xe000 | AKE_SEQ_ERROR;
 198         rspstatus = (response[2] << 8) | (response[3] << 0);
 199     }
 200
 201     if (rspstatus & mask)
 202         host->status |= 0x4000;
 203     else
 204         host->status &= 0xb000;
 205
 206     if (rsplen)
 207         for (rsplen = 0; rsplen < 8; rsplen ++)
 208             host->rsp[~rsplen & 7] = response[(rsplen << 1) | 1] |
 209                     (response[(rsplen << 1) | 0] << 8);
 210
 211     if (timeout)
 212         host->status |= 0x0080;
 213     else if (cmd == 12)
 214         host->status |= 0x0005; /* Makes it more real */
 215     else
 216         host->status |= 0x0001;
 217 }
 218
 219 static void omap_mmc_transfer(struct omap_mmc_s *host)
 220 {
 221     uint8_t value;
 222
 223     if (!host->transfer)
 224         return;
 225
 226     while (1) {
 227         if (host->ddir) {
 228             if (host->fifo_len > host->af_level)
 229                 break;
 230
 231             value = sd_read_data(host->card);
 232             host->fifo[(host->fifo_start + host->fifo_len) & 31] = value;
 233             if (-- host->blen_counter) {
 234                 value = sd_read_data(host->card);
 235                 host->fifo[(host->fifo_start + host->fifo_len) & 31] |=
 236                         value << 8;
 237                 host->blen_counter --;
 238             }
 239
 240             host->fifo_len ++;
 241         } else {
 242             if (!host->fifo_len)
 243                 break;
 244
 245             value = host->fifo[host->fifo_start] & 0xff;
 246             sd_write_data(host->card, value);
 247             if (-- host->blen_counter) {
 248                 value = host->fifo[host->fifo_start] >> 8;
 249                 sd_write_data(host->card, value);
 250                 host->blen_counter --;
 251             }
 252
 253             host->fifo_start ++;
 254             host->fifo_len --;
 255             host->fifo_start &= 31;
 256         }
 257
 258         if (host->blen_counter == 0) {
 259             host->nblk_counter --;
 260             host->blen_counter = host->blen;
 261
 262             if (host->nblk_counter == 0) {
 263                 host->nblk_counter = host->nblk;
 264                 host->transfer = 0;
 265                 host->status |= 0x0008;
 266                 break;
 267             }
 268         }
 269     }
 270 }
 271
 272 static void omap_mmc_update(void *opaque)
 273 {
 274     struct omap_mmc_s *s = opaque;
 275     omap_mmc_transfer(s);
 276     omap_mmc_fifolevel_update(s);
 277     omap_mmc_interrupts_update(s);
 278 }
 279
 280 void omap_mmc_reset(struct omap_mmc_s *host)
 281 {
 282     host->last_cmd = 0;
 283     memset(host->rsp, 0, sizeof(host->rsp));
 284     host->arg = 0;
 285     host->dw = 0;
 286     host->mode = 0;
 287     host->enable = 0;
 288     host->status = 0;
 289     host->mask = 0;
 290     host->cto = 0;
 291     host->dto = 0;
 292     host->fifo_len = 0;
 293     host->blen = 0;
 294     host->blen_counter = 0;
 295     host->nblk = 0;
 296     host->nblk_counter = 0;
 297     host->tx_dma = 0;
 298     host->rx_dma = 0;
 299     host->ae_level = 0x00;
 300     host->af_level = 0x1f;
 301     host->transfer = 0;
 302     host->cdet_wakeup = 0;
 303     host->cdet_enable = 0;
 304     qemu_set_irq(host->coverswitch, host->cdet_state);
 305     host->clkdiv = 0;
 306 }
 307
 308 static uint32_t omap_mmc_read(void *opaque, target_phys_addr_t offset)
 309 {
 310     uint16_t i;
 311     struct omap_mmc_s *s = (struct omap_mmc_s *) opaque;
 312     offset &= OMAP_MPUI_REG_MASK;
 313
 314     switch (offset) {
 315     case 0x00:  /* MMC_CMD */
 316         return s->last_cmd;
 317
 318     case 0x04:  /* MMC_ARGL */
 319         return s->arg & 0x0000ffff;
 320
 321     case 0x08:  /* MMC_ARGH */
 322         return s->arg >> 16;
 323
 324     case 0x0c:  /* MMC_CON */
 325         return (s->dw << 15) | (s->mode << 12) | (s->enable << 11) |
 326                 (s->be << 10) | s->clkdiv;
 327
 328     case 0x10:  /* MMC_STAT */
 329         return s->status;
 330
 331     case 0x14:  /* MMC_IE */
 332         return s->mask;
 333
 334     case 0x18:  /* MMC_CTO */
 335         return s->cto;
 336
 337     case 0x1c:  /* MMC_DTO */
 338         return s->dto;
 339
 340     case 0x20:  /* MMC_DATA */
 341         /* TODO: support 8-bit access */
 342         i = s->fifo[s->fifo_start];
 343         if (s->fifo_len == 0) {
 344             printf("MMC: FIFO underrun\n");
 345             return i;
 346         }
 347         s->fifo_start ++;
 348         s->fifo_len --;
 349         s->fifo_start &= 31;
 350         omap_mmc_transfer(s);
 351         omap_mmc_fifolevel_update(s);
 352         omap_mmc_interrupts_update(s);
 353         return i;
 354
 355     case 0x24:  /* MMC_BLEN */
 356         return s->blen_counter;
 357
 358     case 0x28:  /* MMC_NBLK */
 359         return s->nblk_counter;
 360
 361     case 0x2c:  /* MMC_BUF */
 362         return (s->rx_dma << 15) | (s->af_level << 8) |
 363             (s->tx_dma << 7) | s->ae_level;
 364
 365     case 0x30:  /* MMC_SPI */
 366         return 0x0000;
 367     case 0x34:  /* MMC_SDIO */
 368         return (s->cdet_wakeup << 2) | (s->cdet_enable) | s->sdio;
 369     case 0x38:  /* MMC_SYST */
 370         return 0x0000;
 371
 372     case 0x3c:  /* MMC_REV */
 373         return s->rev;
 374
 375     case 0x40:  /* MMC_RSP0 */
 376     case 0x44:  /* MMC_RSP1 */
 377     case 0x48:  /* MMC_RSP2 */
 378     case 0x4c:  /* MMC_RSP3 */
 379     case 0x50:  /* MMC_RSP4 */
 380     case 0x54:  /* MMC_RSP5 */
 381     case 0x58:  /* MMC_RSP6 */
 382     case 0x5c:  /* MMC_RSP7 */
 383         return s->rsp[(offset - 0x40) >> 2];
 384
 385     /* OMAP2-specific */
 386     case 0x60:  /* MMC_IOSR */
 387     case 0x64:  /* MMC_SYSC */
 388         return 0;
 389     case 0x68:  /* MMC_SYSS */
 390         return 1;                                               /* RSTD */
 391     }
 392
 393     OMAP_BAD_REG(offset);
 394     return 0;
 395 }
 396
 397 static void omap_mmc_write(void *opaque, target_phys_addr_t offset,
 398                 uint32_t value)
 399 {
 400     int i;
 401     struct omap_mmc_s *s = (struct omap_mmc_s *) opaque;
 402     offset &= OMAP_MPUI_REG_MASK;
 403
 404     switch (offset) {
 405     case 0x00:  /* MMC_CMD */
 406         if (!s->enable)
 407             break;
 408
 409         s->last_cmd = value;
 410         for (i = 0; i < 8; i ++)
 411             s->rsp[i] = 0x0000;
 412         omap_mmc_command(s, value & 63, (value >> 15) & 1,
 413                 (sd_cmd_type_t) ((value >> 12) & 3),
 414                 (value >> 11) & 1,
 415                 (sd_rsp_type_t) ((value >> 8) & 7),
 416                 (value >> 7) & 1);
 417         omap_mmc_update(s);
 418         break;
 419
 420     case 0x04:  /* MMC_ARGL */
 421         s->arg &= 0xffff0000;
 422         s->arg |= 0x0000ffff & value;
 423         break;
 424
 425     case 0x08:  /* MMC_ARGH */
 426         s->arg &= 0x0000ffff;
 427         s->arg |= value << 16;
 428         break;
 429
 430     case 0x0c:  /* MMC_CON */
 431         s->dw = (value >> 15) & 1;
 432         s->mode = (value >> 12) & 3;
 433         s->enable = (value >> 11) & 1;
 434         s->be = (value >> 10) & 1;
 435         s->clkdiv = (value >> 0) & (s->rev >= 2 ? 0x3ff : 0xff);
 436         if (s->mode != 0)
 437             printf("SD mode %i unimplemented!\n", s->mode);
 438         if (s->be != 0)
 439             printf("SD FIFO byte sex unimplemented!\n");
 440         if (s->dw != 0 && s->lines < 4)
 441             printf("4-bit SD bus enabled\n");
 442         if (!s->enable)
 443             omap_mmc_reset(s);
 444         break;
 445
 446     case 0x10:  /* MMC_STAT */
 447         s->status &= ~value;
 448         omap_mmc_interrupts_update(s);
 449         break;
 450
 451     case 0x14:  /* MMC_IE */
 452         s->mask = value & 0x7fff;
 453         omap_mmc_interrupts_update(s);
 454         break;
 455
 456     case 0x18:  /* MMC_CTO */
 457         s->cto = value & 0xff;
 458         if (s->cto > 0xfd && s->rev <= 1)
 459             printf("MMC: CTO of 0xff and 0xfe cannot be used!\n");
 460         break;
 461
 462     case 0x1c:  /* MMC_DTO */
 463         s->dto = value & 0xffff;
 464         break;
 465
 466     case 0x20:  /* MMC_DATA */
 467         /* TODO: support 8-bit access */
 468         if (s->fifo_len == 32)
 469             break;
 470         s->fifo[(s->fifo_start + s->fifo_len) & 31] = value;
 471         s->fifo_len ++;
 472         omap_mmc_transfer(s);
 473         omap_mmc_fifolevel_update(s);
 474         omap_mmc_interrupts_update(s);
 475         break;
 476
 477     case 0x24:  /* MMC_BLEN */
 478         s->blen = (value & 0x07ff) + 1;
 479         s->blen_counter = s->blen;
 480         break;
 481
 482     case 0x28:  /* MMC_NBLK */
 483         s->nblk = (value & 0x07ff) + 1;
 484         s->nblk_counter = s->nblk;
 485         s->blen_counter = s->blen;
 486         break;
 487
 488     case 0x2c:  /* MMC_BUF */
 489         s->rx_dma = (value >> 15) & 1;
 490         s->af_level = (value >> 8) & 0x1f;
 491         s->tx_dma = (value >> 7) & 1;
 492         s->ae_level = value & 0x1f;
 493
 494         if (s->rx_dma)
 495             s->status &= 0xfbff;
 496         if (s->tx_dma)
 497             s->status &= 0xf7ff;
 498         omap_mmc_fifolevel_update(s);
 499         omap_mmc_interrupts_update(s);
 500         break;
 501
 502     /* SPI, SDIO and TEST modes unimplemented */
 503     case 0x30:  /* MMC_SPI (OMAP1 only) */
 504         break;
 505     case 0x34:  /* MMC_SDIO */
 506         s->sdio = value & (s->rev >= 2 ? 0xfbf3 : 0x2020);
 507         s->cdet_wakeup = (value >> 9) & 1;
 508         s->cdet_enable = (value >> 2) & 1;
 509         break;
 510     case 0x38:  /* MMC_SYST */
 511         break;
 512
 513     case 0x3c:  /* MMC_REV */
 514     case 0x40:  /* MMC_RSP0 */
 515     case 0x44:  /* MMC_RSP1 */
 516     case 0x48:  /* MMC_RSP2 */
 517     case 0x4c:  /* MMC_RSP3 */
 518     case 0x50:  /* MMC_RSP4 */
 519     case 0x54:  /* MMC_RSP5 */
 520     case 0x58:  /* MMC_RSP6 */
 521     case 0x5c:  /* MMC_RSP7 */
 522         OMAP_RO_REG(offset);
 523         break;
 524
 525     /* OMAP2-specific */
 526     case 0x60:  /* MMC_IOSR */
 527         if (value & 0xf)
 528             printf("MMC: SDIO bits used!\n");
 529         break;
 530     case 0x64:  /* MMC_SYSC */
 531         if (value & (1 << 2))                                   /* SRTS */
 532             omap_mmc_reset(s);
 533         break;
 534     case 0x68:  /* MMC_SYSS */
 535         OMAP_RO_REG(offset);
 536         break;
 537
 538     default:
 539         OMAP_BAD_REG(offset);
 540     }
 541 }
 542
 543 static CPUReadMemoryFunc * const omap_mmc_readfn[] = {
 544     omap_badwidth_read16,
 545     omap_mmc_read,
 546     omap_badwidth_read16,
 547 };
 548
 549 static CPUWriteMemoryFunc * const omap_mmc_writefn[] = {
 550     omap_badwidth_write16,
 551     omap_mmc_write,
 552     omap_badwidth_write16,
 553 };
 554
 555 static void omap_mmc_cover_cb(void *opaque, int line, int level)
 556 {
 557     struct omap_mmc_s *host = (struct omap_mmc_s *) opaque;
 558
 559     if (!host->cdet_state && level) {
 560         host->status |= 0x0002;
 561         omap_mmc_interrupts_update(host);
 562         if (host->cdet_wakeup)
 563             /* TODO: Assert wake-up */;
 564     }
 565
 566     if (host->cdet_state != level) {
 567         qemu_set_irq(host->coverswitch, level);
 568         host->cdet_state = level;
 569     }
 570 }
 571
 572 struct omap_mmc_s *omap_mmc_init(target_phys_addr_t base,
 573                 BlockDriverState *bd,
 574                 qemu_irq irq, qemu_irq dma[], omap_clk clk)
 575 {
 576     int iomemtype;
 577     struct omap_mmc_s *s = (struct omap_mmc_s *)
 578             qemu_mallocz(sizeof(struct omap_mmc_s));
 579
 580     s->irq = irq;
 581     s->dma = dma;
 582     s->clk = clk;
 583     s->lines = 1;       /* TODO: needs to be settable per-board */
 584     s->rev = 1;
 585
 586     omap_mmc_reset(s);
 587
 588     iomemtype = cpu_register_io_memory(omap_mmc_readfn,
 589                     omap_mmc_writefn, s);
 590     cpu_register_physical_memory(base, 0x800, iomemtype);
 591
 592     /* Instantiate the storage */
 593     s->card = sd_init(bd, 0);
 594
 595     return s;
 596 }
 597
 598 struct omap_mmc_s *omap2_mmc_init(struct omap_target_agent_s *ta,
 599                 BlockDriverState *bd, qemu_irq irq, qemu_irq dma[],
 600                 omap_clk fclk, omap_clk iclk)
 601 {
 602     int iomemtype;
 603     struct omap_mmc_s *s = (struct omap_mmc_s *)
 604             qemu_mallocz(sizeof(struct omap_mmc_s));
 605
 606     s->irq = irq;
 607     s->dma = dma;
 608     s->clk = fclk;
 609     s->lines = 4;
 610     s->rev = 2;
 611
 612     omap_mmc_reset(s);
 613
 614     iomemtype = l4_register_io_memory(omap_mmc_readfn,
 615                     omap_mmc_writefn, s);
 616     omap_l4_attach(ta, 0, iomemtype);
 617
 618     /* Instantiate the storage */
 619     s->card = sd_init(bd, 0);
 620
 621     s->cdet = qemu_allocate_irqs(omap_mmc_cover_cb, s, 1)[0];
 622     sd_set_cb(s->card, 0, s->cdet);
 623
 624     return s;
 625 }
 626
 627 void omap_mmc_handlers(struct omap_mmc_s *s, qemu_irq ro, qemu_irq cover)
 628 {
 629     if (s->cdet) {
 630         sd_set_cb(s->card, ro, s->cdet);
 631         s->coverswitch = cover;
 632         qemu_set_irq(cover, s->cdet_state);
 633     } else
 634         sd_set_cb(s->card, ro, cover);
 635 }
 636
 637 void omap_mmc_enable(struct omap_mmc_s *s, int enable)
 638 {
 639     sd_enable(s->card, enable);
 640 }