avr/mmc.c

   1 /*-----------------------------------------------------------------------*/
   2 /* MMCv3/SDv1/SDv2 (in SPI mode) control module  (C)ChaN, 2007             */
   3 /*-----------------------------------------------------------------------*/
   4 /* Only spi_rcvr(), spi_xmit(), disk_timerproc() and some macros         */
   5 /* are platform dependent.                                               */
   6 /*-----------------------------------------------------------------------*/
   7
   8 #include "common.h"
   9 #include <stdbool.h>
  10 #include "timer.h"
  11 #include "spi.h"
  12 #include "diskio.h"
  13 #include "debug.h"
  14
  15 #define MAX_DRV         2
  16
  17 /* Port Controls  (Platform dependent) */
  18 /* SD card socket connections */
  19
  20 /* TODO: config.h cofig macros */
  21
  22 //#define SD_CD_0               SBIT(PORT,)             /* Card detect switch */
  23 //#define SD_CD_0_IN    SBIT(PIN,)
  24 //#define SD_CD_0_DDR   SBIT(DDR,)
  25
  26 //#define SD_WP_0               SBIT(PORT,)             /* Write protect switch */
  27 //#define SD_WP_0_IN    SBIT(PIN,)
  28 //#define SD_WP_0_DDR   SBIT(DDR,)
  29
  30 #define SD_CS_0         SBIT(PORTB,0)   /* Chip select pin */
  31 #define SD_CS_0_IN      SBIT(PINB,0)
  32 #define SD_CS_0_DDR     SBIT(DDRB,0)
  33
  34
  35 //#define SD_CD_1               SBIT(PORTG,3)   /* Card detect switch */
  36 //#define SD_CD_1_IN    SBIT(PING,3)
  37 //#define SD_CD_1_DDR   SBIT(DDRG,3)
  38
  39 //#define SD_WP_1               SBIT(PORTG,5)   /* Write protect switch */
  40 //#define SD_WP_1_IN    SBIT(PING,5)
  41 //#define SD_WP_1_DDR   SBIT(DDRG,5)
  42
  43 #define SD_CS_1         SBIT(PORTG,4)           /* Chip select pin */
  44 #define SD_CS_1_IN      SBIT(PING,4)
  45 #define SD_CS_1_DDR     SBIT(DDRG,4)
  46
  47
  48 #define SPI_CLK_SLOW()  SPISetMMCInitClock()    /* Set slow clock (100k-400k) */
  49 #define SPI_CLK_FAST()  SPISetFastClock()               /* Set fast clock (depends on the CSD) */
  50
  51 /*--------------------------------------------------------------------------
  52  Definitions for MMC/SDC command
  53  ---------------------------------------------------------------------------*/
  54
  55 #define CMD0    (0)                     /* GO_IDLE_STATE */
  56 #define CMD1    (1)                     /* SEND_OP_COND (MMC) */
  57 #define ACMD41  (0x80+41)       /* SEND_OP_COND (SDC) */
  58 #define CMD8    (8)                     /* SEND_IF_COND */
  59 #define CMD9    (9)                     /* SEND_CSD */
  60 #define CMD10   (10)            /* SEND_CID */
  61 #define CMD12   (12)            /* STOP_TRANSMISSION */
  62 #define ACMD13  (0x80+13)       /* SD_STATUS (SDC) */
  63 #define CMD16   (16)            /* SET_BLOCKLEN */
  64 #define CMD17   (17)            /* READ_SINGLE_BLOCK */
  65 #define CMD18   (18)            /* READ_MULTIPLE_BLOCK */
  66 #define CMD23   (23)            /* SET_BLOCK_COUNT (MMC) */
  67 #define ACMD23  (0x80+23)       /* SET_WR_BLK_ERASE_COUNT (SDC) */
  68 #define CMD24   (24)            /* WRITE_BLOCK */
  69 #define CMD25   (25)            /* WRITE_MULTIPLE_BLOCK */
  70 #define CMD55   (55)            /* APP_CMD */
  71 #define CMD58   (58)            /* READ_OCR */
  72
  73
  74 /*--------------------------------------------------------------------------
  75
  76  Module Private Functions
  77
  78  ---------------------------------------------------------------------------*/
  79
  80 struct sdsock_stat_s {
  81         volatile DSTATUS stat;  /* Disk/socket status */
  82         BYTE CardType;          /* Card type flags */
  83 };
  84
  85 static
  86 struct sdsock_stat_s
  87         socket[MAX_DRV] = {
  88                 {.stat=STA_NOINIT},
  89                 {.stat=STA_NOINIT}
  90         };
  91
  92 /*-----------------------------------------------------------------------*/
  93 /* Wait for card ready                                                   */
  94 /*-----------------------------------------------------------------------*/
  95
  96 static
  97 int wait_ready (void)   /* 1:OK, 0:Timeout */
  98 {
  99         uint32_t to = get_timer(0);
 100
 101         /* Wait for ready in timeout of 500ms */
 102         do {
 103                 if (spi_rcvr() == 0xFF) {
 104                         return 1;
 105                 }
 106         } while (get_timer(to) < 500);
 107
 108         return 0;
 109 }
 110
 111 /*-----------------------------------------------------------------------*/
 112 /* Deselect the card and release SPI bus                                 */
 113 /*-----------------------------------------------------------------------*/
 114
 115 static
 116 void deselect(BYTE drv)
 117 {
 118         //debug("*** enter deselect()\n");
 119         if (drv == 0)
 120                 SD_CS_0 = 1;
 121         else {
 122                 SD_CS_1 = 1;
 123         }
 124
 125         /* Dummy clock (TODO: force DO hi-z for multiple slave SPI) */
 126         if (socket[drv].stat & STA_FAST)
 127                 SPI_CLK_FAST();
 128         else
 129                 SPI_CLK_SLOW();
 130         spi_rcvr();
 131         SPI_OFF();
 132
 133         if (drv == 0) {
 134 #ifdef SD_CS_0_IN
 135                 SD_CS_0_DDR = 0;
 136                 SD_CS_0 = 0;
 137 #endif
 138         } else {
 139 #ifdef SD_CS_1_IN
 140                 SD_CS_1_DDR = 0;
 141                 SD_CS_1 = 0;
 142 #endif
 143         }
 144         //debug("***  exit deselect()\n");
 145 }
 146
 147 /*-----------------------------------------------------------------------*/
 148 /* Select the card and wait for ready                                    */
 149 /*-----------------------------------------------------------------------*/
 150
 151 static
 152 int select(BYTE drv)    /* 1:Successful, 0:Timeout */
 153 {
 154         //debug("*** enter select()\n");
 155         if (drv == 0) {
 156 #ifdef SD_CS_0_IN
 157                 SD_CS_0 = 1;
 158                 SD_CS_0_DDR = 1;
 159 #endif
 160                 SD_CS_0 = 0;
 161         } else {
 162 #ifdef SD_CS_1_IN
 163                 SD_CS_1 = 1;
 164                 SD_CS_1_DDR = 1;
 165 #endif
 166                 SD_CS_1 = 0;
 167         }
 168
 169         if (socket[drv].stat & STA_FAST)
 170                 SPI_CLK_FAST();
 171         else
 172                 SPI_CLK_SLOW();
 173
 174         /* Dummy clock (force DO enabled) */
 175         spi_rcvr();
 176
 177         if (wait_ready()) {
 178                 //debug("***  exit select() == 1\n");
 179                 return 1;       /* OK */
 180         }
 181         deselect(drv);
 182         //debug("***  exit select() == 0\n");
 183
 184         return 0;       /* Timeout */
 185 }
 186
 187 /*-----------------------------------------------------------------------*/
 188 /* Power Control  (Platform dependent)                                   */
 189 /*-----------------------------------------------------------------------*/
 190 /* When the target system does not support socket power control, there   */
 191 /* is nothing to do in these functions and chk_power always returns 1.   */
 192
 193 static
 194 void power_on(BYTE drv)
 195 {
 196         //debug("*** enter power_on()\n");
 197
 198         if (drv == 0) {
 199 #ifdef SD_PWR_0
 200                 SD_PWR_0 = 0;           /* Drives PWR pin high */
 201 #endif
 202
 203         } else {
 204 #ifdef SD_PWR_1
 205                 SD_PWR_1 = 0;           /* Drives PWR pin high */
 206 #endif
 207         }
 208 #if defined SD_PWR_0 || defined SD_PWR_1
 209                 for (uint32_t to = get_timer(0); get_timer(to) < 30;)
 210                         ; /* Wait for 30ms */
 211 #endif
 212         //debug("***  exit power_on()\n");
 213 }
 214
 215 static
 216 void power_off(BYTE drv)
 217 {
 218         //debug("*** enter power_off()\n");
 219         select(drv);            /* Wait for card ready */
 220         deselect(drv);
 221
 222         if (drv == 0) {
 223 #ifdef SD_PWR_0
 224                 SD_PWR_0 = 1;           /* Socket power OFF */
 225 #endif
 226         } else {
 227 #ifdef SD_PWR_1
 228                 SD_PWR_1 = 1;           /* Socket power OFF */
 229 #endif
 230         }
 231         socket[drv].stat |= STA_NOINIT;
 232         //debug("***  exit power_off()\n");
 233 }
 234
 235 #if 0
 236 static
 237 int chk_power(BYTE drv) /* Socket power state: 0=off, 1=on */
 238 {
 239         if (drv == 0) {
 240 #ifdef SD_PWR_0
 241                 return SD_PWR_0 == 0;
 242 #else
 243                 return 1;
 244 #endif /* SD_PWR_PIN */
 245         } else {
 246 #ifdef SD_PWR_1
 247                 return SD_PWR_1 == 0;
 248 #else
 249                 return 1;
 250 #endif /* SD_PWR_PIN */
 251         }
 252 }
 253 #endif
 254
 255 /*-----------------------------------------------------------------------*/
 256 /* Receive a data packet from MMC                                        */
 257 /*-----------------------------------------------------------------------*/
 258
 259 static
 260 int rcvr_datablock (
 261         BYTE *buff,                     /* Data buffer to store received data */
 262 UINT btr /* Byte count (must be multiple of 4) */
 263 ) {
 264         BYTE token, tmp;
 265         uint32_t to = get_timer(0);
 266
 267         /* Wait for data packet in timeout of 200ms */
 268         do {
 269                 token = spi_rcvr();
 270         } while ((token == 0xFF) && get_timer(to) < 200);
 271         if(token != 0xFE) return 0;             /* If not valid data token, retutn with error */
 272
 273         tmp = spi_rcvr(); /* shift in first byte */
 274         spi_write(0xff); /* start shift in next byte */
 275         while (--btr) {
 276                 *buff++ = tmp;
 277                 asm volatile (""::"r"(buff), "r"(btr));
 278                 spi_wait();
 279                 tmp = SPDR;
 280                 spi_write(0xff);
 281         }
 282         *buff = tmp; /* store last byte in buffer while SPI module shifts in crc part1 */
 283         spi_wait();
 284         spi_rcvr(); /* second crc */
 285
 286         return 1; /* Return with success */
 287 }
 288
 289 /*-----------------------------------------------------------------------*/
 290 /* Send a data packet to MMC                                             */
 291 /*-----------------------------------------------------------------------*/
 292
 293 #if     _USE_WRITE
 294 static
 295 int xmit_datablock (
 296                 const BYTE *buff, /* 512 byte data block to be transmitted */
 297                 BYTE token /* Data/Stop token */
 298 )
 299 {
 300         BYTE resp, tmp;
 301         UINT btr;
 302
 303         if (!wait_ready()) return 0;
 304
 305         spi_write(token); /* Xmit data token */
 306         if (token != 0xFD) { /* Is data token */
 307                 btr = 512;
 308                 do {
 309                         tmp = *buff++;
 310                         spi_wait();
 311                         spi_write(tmp);
 312                 }while (--btr);
 313                 spi_wait();
 314                 spi_xmit(0xff); /* CRC (Dummy) */
 315                 spi_xmit(0xff);
 316                 resp = spi_rcvr(); /* Reveive data response */
 317                 return ((resp & 0x1F) != 0x05) ? 0 : 1; /* If not accepted, return with error */
 318         }
 319
 320         spi_wait();
 321         return 1;
 322 }
 323 #endif /* _USE_WRITE */
 324
 325 /*-----------------------------------------------------------------------*/
 326 /* Send a command packet to MMC                                          */
 327 /*-----------------------------------------------------------------------*/
 328
 329 static
 330 BYTE send_cmd (         /* Returns R1 resp (bit7==1:Send failed) */
 331         BYTE drv,       /* Physical drive nmuber (0) */
 332         BYTE cmd,       /* Command index */
 333         DWORD arg       /* Argument */
 334 ) {
 335         union {
 336                 DWORD as32;
 337                 BYTE as8[4];
 338         } argtmp;
 339         BYTE n, res;
 340
 341         //debug("*** send_cmd( %.2x )\n", cmd);
 342
 343         if (cmd & 0x80) { /* ACMD<n> is the command sequense of CMD55-CMD<n> */
 344                 cmd &= 0x7F;
 345                 res = send_cmd(drv, CMD55, 0);
 346                 if (res > 1)
 347                         return res;
 348         }
 349
 350         /* Select the card and wait for ready except to stop multiple block read */
 351         if (cmd != CMD12) {
 352                 deselect(drv);
 353                 if (!select(drv))
 354                         return 0xFF;
 355         }
 356
 357         /* Send command packet */
 358         spi_xmit(0x40 | cmd); /* Start + Command index */
 359         argtmp.as32 = arg;
 360         spi_xmit(argtmp.as8[3]); /* Argument[31..24] */
 361         spi_xmit(argtmp.as8[2]); /* Argument[23..16] */
 362         spi_xmit(argtmp.as8[1]); /* Argument[15..8] */
 363         spi_xmit(argtmp.as8[0]); /* Argument[7..0] */
 364
 365         n = 0x01; /* Dummy CRC + Stop */
 366         if (cmd == CMD0)
 367                 n = 0x95; /* Valid CRC for CMD0(0) */
 368         if (cmd == CMD8)
 369                 n = 0x87; /* Valid CRC for CMD8(0x1AA) */
 370         spi_xmit(n);
 371
 372         /* Receive command response */
 373         if (cmd == CMD12)
 374                 spi_rcvr(); /* Skip a stuff byte when stop reading */
 375         n = 10; /* Wait for a valid response in timeout of 10 attempts */
 376         do
 377                 res = spi_rcvr();
 378         while ((res & 0x80) && --n);
 379
 380         return res; /* Return with the response value */
 381 }
 382
 383 /*--------------------------------------------------------------------------
 384
 385  Public Functions
 386
 387  ---------------------------------------------------------------------------*/
 388
 389 void setup_mmc(void)
 390 {
 391 #ifdef SD_PWR_0
 392                 SD_PWR_1 = 1;           /* Drives PWR pin low */
 393                 SD_PWR_0_DDR = 1;       /* Turns on PWR pin as output */
 394 #endif
 395 #ifdef SD_WP_0
 396                 SD_WP_0_DDR = 0;
 397                 SD_WP_0 = 1;            /* Pullup */
 398 #endif
 399
 400 #ifdef SD_PWR_1
 401                 SD_PWR_1 = 1;           /* Drives PWR pin low */
 402                 SD_PWR_1_DDR = 1;       /* Turns on PWR pin as output */
 403 #endif
 404 #ifdef SD_WP_1
 405                 SD_WP_1_DDR = 0;
 406                 SD_WP_1 = 1;            /* Pullup */
 407 #endif
 408
 409         /* SPI as master */
 410         PRR0 &= ~_BV(PRSPI);
 411         SPI_DDR = (SPI_DDR & ~(_BV(SPI_MISO) | _BV(SPI_SS)))
 412                         | _BV(SPI_MOSI) | _BV(SPI_SCK);
 413         SPI_PORT = SPI_PORT & ~(_BV(SPI_MOSI) | _BV(SPI_SCK));
 414
 415 #if defined SD_CD_0
 416         SD_CD_0_DDR = 0;
 417         SD_CD_0 = 1;
 418 #elif defined SD_CS_0_IN
 419         SD_CS_0_DDR = 0;
 420         SD_CS_0 = 0;
 421 #else
 422         SD_CS_0_DDR = 1;
 423         SD_CS_0 = 1;
 424 #endif
 425
 426 #if defined SD_CD_1
 427         SD_CD_1_DDR = 0;
 428         SD_CD_1 = 1;
 429 #elif defined SD_CS_1_IN
 430         SD_CS_1_DDR = 0;
 431         SD_CS_1 = 0;
 432 #else
 433         SD_CS_1_DDR = 1;
 434         SD_CS_1 = 1;
 435 #endif
 436 }
 437
 438 /*-----------------------------------------------------------------------*/
 439 /* Initialize Disk Drive                                                 */
 440 /*-----------------------------------------------------------------------*/
 441
 442 #define MMC_INIT_TO 1000        /* 1s */
 443
 444 DSTATUS disk_initialize (
 445         BYTE drv                /* Physical drive nmuber (0) */
 446 )
 447 {
 448         BYTE n, cmd, ty, ocr[4];
 449
 450         if (drv >= MAX_DRV)
 451                 return STA_NOINIT; /* Supports only single drive */
 452         if (socket[drv].stat & STA_NODISK)
 453                 return socket[drv].stat; /* No card in the socket */
 454
 455         power_on(drv); /* Force socket power on */
 456         socket[drv].stat &= ~STA_FAST;
 457         SPI_CLK_SLOW();
 458         for (n = 10; n; n--)
 459                 spi_rcvr(); /* 80 dummy clocks */
 460
 461         ty = 0;
 462         if (send_cmd(drv, CMD0, 0) == 1) { /* Enter Idle state */
 463                 /* Init timeout timer */
 464                 uint32_t timer = get_timer(0);
 465
 466                 if (send_cmd(drv, CMD8, 0x1AA) == 1) {  /* SDv2? */
 467                         /* Get trailing return value of R7 resp */
 468                         for (n = 0; n < 4; n++)
 469                                 ocr[n] = spi_rcvr();
 470                         if (ocr[2] == 0x01 && ocr[3] == 0xAA) {
 471                                 /* The card can work at vdd range of 2.7-3.6V */
 472                                 while (get_timer(timer) < MMC_INIT_TO
 473                                         && send_cmd(drv, ACMD41, 1UL << 30))
 474                                         ; /* Wait for leaving idle state (ACMD41 with HCS bit) */
 475                                 if (get_timer(timer) < MMC_INIT_TO && send_cmd(drv, CMD58, 0) == 0) {
 476                                         /* Check CCS bit in the OCR */
 477                                         for (n = 0; n < 4; n++)
 478                                                 ocr[n] = spi_rcvr();
 479                                         ty = (ocr[0] & 0x40) ? CT_SD2 | CT_BLOCK : CT_SD2;      /* SDv2 */
 480                                 }
 481                         }
 482                 } else {                                                        /* SDv1 or MMCv3 */
 483                         if (send_cmd(drv, ACMD41, 0) <= 1) {
 484                                 ty = CT_SD1; cmd = ACMD41;      /* SDv1 */
 485                         } else {
 486                                 ty = CT_MMC; cmd = CMD1;        /* MMCv3 */
 487                         }
 488
 489                         /* Wait for leaving idle state */
 490                         while (get_timer(timer) < MMC_INIT_TO && send_cmd(drv, cmd, 0))
 491                                 ;
 492
 493                         /* Set R/W block length to 512 */
 494                         if (!(get_timer(timer) < MMC_INIT_TO) || send_cmd(drv, CMD16, 512) != 0)
 495                                 ty = 0;
 496                 }
 497         }
 498         socket[drv].CardType = ty;
 499         deselect(drv);
 500
 501         if (ty) { /* Initialization succeded */
 502                 /* Clear STA_NOINIT */
 503                 socket[drv].stat = (socket[drv].stat & ~STA_NOINIT) | STA_FAST;
 504         } else { /* Initialization failed */
 505                 power_off(drv);
 506         }
 507
 508         return socket[drv].stat;
 509 }
 510
 511 /*-----------------------------------------------------------------------*/
 512 /* Get Disk Status                                                       */
 513 /*-----------------------------------------------------------------------*/
 514
 515 DSTATUS disk_status (
 516         BYTE drv        /* Physical drive nmuber (0) */
 517 )
 518 {
 519         if (drv >= MAX_DRV)
 520                 return STA_NOINIT;
 521         return socket[drv].stat;
 522 }
 523
 524 /*-----------------------------------------------------------------------*/
 525 /* Read Sector(s)                                                        */
 526 /*-----------------------------------------------------------------------*/
 527
 528 DRESULT disk_read (
 529         BYTE drv,       /* Physical drive nmuber (0) */
 530         BYTE *buff,     /* Pointer to the data buffer to store read data */
 531         DWORD sector,   /* Start sector number (LBA) */
 532         UINT count      /* Sector count (1..255) */
 533 )
 534 {
 535         BYTE cmd;
 536
 537         if (drv >= MAX_DRV || !count)
 538                 return RES_PARERR;
 539         if (socket[drv].stat & STA_NOINIT)
 540                 return RES_NOTRDY;
 541
 542         /* Convert to byte address if needed */
 543         if (!(socket[drv].CardType & CT_BLOCK))
 544                 sector *= 512;
 545
 546         /*  READ_MULTIPLE_BLOCK : READ_SINGLE_BLOCK */
 547         cmd = count > 1 ? CMD18 : CMD17;
 548         if (send_cmd(drv, cmd, sector) == 0) {
 549                 do {
 550                         if (!rcvr_datablock(buff, 512))
 551                                 break;
 552                         buff += 512;
 553                 } while (--count);
 554                 if (cmd == CMD18)
 555                         send_cmd(drv, CMD12, 0);        /* STOP_TRANSMISSION */
 556         }
 557         deselect(drv);
 558
 559         return count ? RES_ERROR : RES_OK;
 560 }
 561
 562 /*-----------------------------------------------------------------------*/
 563 /* Write Sector(s)                                                       */
 564 /*-----------------------------------------------------------------------*/
 565
 566 #if _USE_WRITE
 567 DRESULT disk_write (
 568         BYTE drv,       /* Physical drive nmuber (0) */
 569         const BYTE *buff, /* Pointer to the data to be written */
 570         DWORD sector,   /* Start sector number (LBA) */
 571         UINT count      /* Sector count (1..255) */
 572 )
 573 {
 574         if (drv >= MAX_DRV || !count)
 575                 return RES_PARERR;
 576         if (socket[drv].stat & STA_NOINIT)
 577                 return RES_NOTRDY;
 578         if (socket[drv].stat & STA_PROTECT)
 579                 return RES_WRPRT;
 580
 581         /* Convert to byte address if needed */
 582         if (!(socket[drv].CardType & CT_BLOCK))
 583                 sector *= 512;
 584
 585         if (count == 1) {
 586                 /* Single block write */
 587                 if ((send_cmd(drv, CMD24, sector) == 0) /* WRITE_BLOCK */
 588                                 && xmit_datablock(buff, 0xFE))
 589                 count = 0;
 590         } else {
 591                 /* Multiple block write */
 592                 if (socket[drv].CardType & CT_SDC)
 593                         send_cmd(drv, ACMD23, count);
 594                 if (send_cmd(drv, CMD25, sector) == 0) {
 595                         /* WRITE_MULTIPLE_BLOCK */
 596                         do {
 597                                 if (!xmit_datablock(buff, 0xFC))
 598                                         break;
 599                                 buff += 512;
 600                         } while (--count);
 601                         if (!xmit_datablock(0, 0xFD)) /* STOP_TRAN token */
 602                                 count = 1;
 603                 }
 604         }
 605         deselect(drv);
 606
 607         return count ? RES_ERROR : RES_OK;
 608 }
 609 #endif /* _USE_WRITE */
 610
 611 /*-----------------------------------------------------------------------*/
 612 /* Miscellaneous Functions                                               */
 613 /*-----------------------------------------------------------------------*/
 614
 615 #if _USE_IOCTL
 616 DRESULT disk_ioctl (
 617         BYTE drv,               /* Physical drive nmuber (0) */
 618         BYTE cmd,               /* Control code */
 619         void *buff              /* Buffer to send/receive control data */
 620 )
 621 {
 622         DRESULT res;
 623         BYTE n, csd[16], *ptr = buff;
 624         DWORD csize;
 625
 626         if (drv >= MAX_DRV)
 627                 return RES_PARERR;
 628
 629         res = RES_ERROR;
 630
 631         if (socket[drv].stat & STA_NOINIT)
 632                 return RES_NOTRDY;
 633
 634         /* TODO: SPI clock? */
 635
 636         switch (cmd) {
 637         case CTRL_SYNC :                /* Make sure that no pending write process. Do not remove this or written sector might not left updated. */
 638                 if (select(drv))
 639                         res = RES_OK;
 640                 break;
 641
 642         case GET_SECTOR_COUNT: /* Get number of sectors on the disk (DWORD) */
 643                 if ((send_cmd(drv, CMD9, 0) == 0) && rcvr_datablock(csd, 16)) {
 644                         if ((csd[0] >> 6) == 1) {       /* SDC ver 2.00 */
 645                                 csize = csd[9] + ((WORD)csd[8] << 8) + ((DWORD)(csd[7] & 63) << 16) + 1;
 646                                 *(DWORD*)buff = csize << 10;
 647                         } else {                                        /* SDC ver 1.XX or MMC*/
 648                                 n = (csd[5] & 15) + ((csd[10] & 128) >> 7) + ((csd[9] & 3) << 1) + 2;
 649                                 csize = (csd[8] >> 6) + ((WORD)csd[7] << 2) + ((WORD)(csd[6] & 3) << 10) + 1;
 650                                 *(DWORD*)buff = csize << (n - 9);
 651                         }
 652                         res = RES_OK;
 653                 }
 654                 break;
 655
 656         case GET_BLOCK_SIZE:    /* Get erase block size in unit of sector (DWORD) */
 657                 if (socket[drv].CardType & CT_SD2) {    /* SDv2? */
 658                         if (send_cmd(drv, ACMD13, 0) == 0) { /* Read SD status */
 659                                 spi_rcvr();
 660                                 if (rcvr_datablock(csd, 16)) { /* Read partial block */
 661                                         for (n = 64 - 16; n; n--)
 662                                                 spi_rcvr(); /* Purge trailing data */
 663                                         *(DWORD*) buff = 16UL << (csd[10] >> 4);
 664                                         res = RES_OK;
 665                                 }
 666                         }
 667                 } else {                                        /* SDv1 or MMCv3 */
 668                         if ((send_cmd(drv, CMD9, 0) == 0) && rcvr_datablock(csd, 16)) { /* Read CSD */
 669                                 if (socket[drv].CardType & CT_SD1) {    /* SDv1 */
 670                                         *(DWORD*)buff = (((csd[10] & 63) << 1) + ((WORD)(csd[11] & 128) >> 7) + 1) << ((csd[13] >> 6) - 1);
 671                                 } else {                                        /* MMCv3 */
 672                                         *(DWORD*)buff = ((WORD)((csd[10] & 124) >> 2) + 1) * (((csd[11] & 3) << 3) + ((csd[11] & 224) >> 5) + 1);
 673                                 }
 674                                 res = RES_OK;
 675                         }
 676                 }
 677                 break;
 678
 679         /* Following commands are never used by FatFs module */
 680
 681         case MMC_GET_TYPE:              /* Get card type flags (1 byte) */
 682                 *ptr = socket[drv].CardType;
 683                 res = RES_OK;
 684                 break;
 685
 686         case MMC_GET_CSD: /* Receive CSD as a data block (16 bytes) */
 687                 if (send_cmd(drv, CMD9, 0) == 0 /* READ_CSD */
 688                 && rcvr_datablock(ptr, 16))
 689                         res = RES_OK;
 690                 break;
 691
 692         case MMC_GET_CID: /* Receive CID as a data block (16 bytes) */
 693                 if (send_cmd(drv, CMD10, 0) == 0 /* READ_CID */
 694                 && rcvr_datablock(ptr, 16))
 695                         res = RES_OK;
 696                 break;
 697
 698         case MMC_GET_OCR: /* Receive OCR as an R3 resp (4 bytes) */
 699                 if (send_cmd(drv, CMD58, 0) == 0) { /* READ_OCR */
 700                         for (n = 4; n; n--)
 701                                 *ptr++ = spi_rcvr();
 702                         res = RES_OK;
 703                 }
 704                 break;
 705
 706         case MMC_GET_SDSTAT: /* Receive SD status as a data block (64 bytes) */
 707                 if (send_cmd(drv, ACMD13, 0) == 0) { /* SD_STATUS */
 708                         spi_rcvr();
 709                         if (rcvr_datablock(ptr, 64))
 710                                 res = RES_OK;
 711                 }
 712                 break;
 713
 714         case CTRL_POWER_OFF :   /* Power off */
 715                 power_off(drv);
 716                 socket[drv].stat |= STA_NOINIT;
 717                 res = RES_OK;
 718                 break;
 719
 720         default:
 721                 res = RES_PARERR;
 722         }
 723
 724         deselect(drv);
 725
 726         return res;
 727 }
 728 #endif /* _USE_IOCTL */
 729
 730 /*-----------------------------------------------------------------------*/
 731 /* Device Timer Interrupt Procedure  (Platform dependent)                */
 732 /*-----------------------------------------------------------------------*/
 733 /* This function must be called in period of 10ms                        */
 734
 735 void disk_timerproc (void)
 736 {
 737         BYTE s;
 738
 739         s = socket[0].stat;
 740 #ifdef SD_WP_0
 741         if (SD_WP_0_IN == 0)                    /* Write protected */
 742                 s |= STA_PROTECT;
 743         else                                                    /* Write enabled */
 744                 s &= ~STA_PROTECT;
 745 #endif
 746
 747 #if defined SD_CD_0
 748         if (SD_CD_0_IN == 0)                    /* Card inserted */
 749                 s &= ~STA_NODISK;
 750         else                                                    /* Socket empty */
 751                 s |= (STA_NODISK | STA_NOINIT);
 752 #elif defined SD_CS_0_IN
 753         if (SD_CS_0_DDR == 0) {
 754                 if (SD_CS_0_IN == 1)            /* Card inserted */
 755                         s &= ~STA_NODISK;
 756                 else                                            /* Socket empty */
 757                         s |= (STA_NODISK | STA_NOINIT);
 758         }
 759 #endif
 760         socket[0].stat = s;                             /* Update MMC status */
 761
 762         s = socket[1].stat;
 763 #ifdef SD_WP_1
 764         if (SD_WP_1_IN == 0)                    /* Write protected */
 765                 s |= STA_PROTECT;
 766         else                                                    /* Write enabled */
 767                 s &= ~STA_PROTECT;
 768 #endif
 769
 770 #if defined SD_CD_1
 771         if (SD_CD_1_IN == 0)                    /* Card inserted */
 772                 s &= ~STA_NODISK;
 773         else                                                    /* Socket empty */
 774                 s |= (STA_NODISK | STA_NOINIT);
 775 #elif defined SD_CS_1_IN
 776         if (SD_CS_1_DDR == 0) {
 777                 if (SD_CS_1_IN == 1)            /* Card inserted */
 778                         s &= ~STA_NODISK;
 779                 else                                            /* Socket empty */
 780                         s |= (STA_NODISK | STA_NOINIT);
 781         }
 782 #endif
 783         socket[1].stat = s;                     /* Update MMC status */
 784 }