/**
 * STM32F1: MMCv3/SDv1/SDv2 (SPI mode) control module
 *
 * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 * Copyright (c) 2019 BigTreeTech [https://github.com/bigtreetech]
 * Copyright (C) 2015, ChaN, all right reserved.
 *
 * This software is a free software and there is NO WARRANTY.
 * No restriction on use. You can use, modify and redistribute it for
 * personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.
 * Redistributions of source code must retain the above copyright notice.
 *
 */

#include "../../inc/MarlinConfig.h"

#ifdef HAS_ONBOARD_SD

#include "onboard_sd.h"
#include "SPI.h"
#include "fastio.h"

#ifdef SHARED_SD_CARD
  #ifndef ON_BOARD_SPI_DEVICE
    #define ON_BOARD_SPI_DEVICE SPI_DEVICE
  #endif
  #define ONBOARD_SD_SPI SPI
#else
  SPIClass OnBoardSPI(ON_BOARD_SPI_DEVICE);
  #define ONBOARD_SD_SPI OnBoardSPI
#endif

#if ON_BOARD_SPI_DEVICE == 1
  #define SPI_CLOCK_MAX SPI_BAUD_PCLK_DIV_4
#else
  #define SPI_CLOCK_MAX SPI_BAUD_PCLK_DIV_2
#endif

#define CS_LOW()  WRITE(ONBOARD_SD_CS_PIN, LOW)  /* Set OnBoardSPI cs low */
#define CS_HIGH() WRITE(ONBOARD_SD_CS_PIN, HIGH) /* Set OnBoardSPI cs high */

#define FCLK_FAST() ONBOARD_SD_SPI.setClockDivider(SPI_CLOCK_MAX)
#define FCLK_SLOW() ONBOARD_SD_SPI.setClockDivider(SPI_BAUD_PCLK_DIV_256)

/*--------------------------------------------------------------------------
   Module Private Functions
---------------------------------------------------------------------------*/

/* MMC/SD command */
#define CMD0  (0)     /* GO_IDLE_STATE */
#define CMD1  (1)     /* SEND_OP_COND (MMC) */
#define ACMD41  (0x80+41) /* SEND_OP_COND (SDC) */
#define CMD8  (8)     /* SEND_IF_COND */
#define CMD9  (9)     /* SEND_CSD */
#define CMD10 (10)    /* SEND_CID */
#define CMD12 (12)    /* STOP_TRANSMISSION */
#define ACMD13  (0x80+13) /* SD_STATUS (SDC) */
#define CMD16 (16)    /* SET_BLOCKLEN */
#define CMD17 (17)    /* READ_SINGLE_BLOCK */
#define CMD18 (18)    /* READ_MULTIPLE_BLOCK */
#define CMD23 (23)    /* SET_BLOCK_COUNT (MMC) */
#define ACMD23  (0x80+23) /* SET_WR_BLK_ERASE_COUNT (SDC) */
#define CMD24 (24)    /* WRITE_BLOCK */
#define CMD25 (25)    /* WRITE_MULTIPLE_BLOCK */
#define CMD32 (32)    /* ERASE_ER_BLK_START */
#define CMD33 (33)    /* ERASE_ER_BLK_END */
#define CMD38 (38)    /* ERASE */
#define CMD48 (48)    /* READ_EXTR_SINGLE */
#define CMD49 (49)    /* WRITE_EXTR_SINGLE */
#define CMD55 (55)    /* APP_CMD */
#define CMD58 (58)    /* READ_OCR */

static volatile DSTATUS Stat = STA_NOINIT;  /* Physical drive status */
static volatile UINT timeout;
static BYTE CardType;      /* Card type flags */

/*-----------------------------------------------------------------------*/
/* Send/Receive data to the MMC  (Platform dependent)                    */
/*-----------------------------------------------------------------------*/

/* Exchange a byte */
static BYTE xchg_spi (
  BYTE dat  /* Data to send */
) {
  BYTE returnByte = ONBOARD_SD_SPI.transfer(dat);
  return returnByte;
}

/* Receive multiple byte */
static void rcvr_spi_multi (
  BYTE *buff,   /* Pointer to data buffer */
  UINT btr    /* Number of bytes to receive (16, 64 or 512) */
) {
  ONBOARD_SD_SPI.dmaTransfer(0, const_cast<uint8_t*>(buff), btr);
}

#if _DISKIO_WRITE

  /* Send multiple bytes */
  static void xmit_spi_multi (
    const BYTE *buff, /* Pointer to the data */
    UINT btx      /* Number of bytes to send (multiple of 16) */
  ) {
    ONBOARD_SD_SPI.dmaSend(const_cast<uint8_t*>(buff), btx);
  }

#endif // _DISKIO_WRITE

/*-----------------------------------------------------------------------*/
/* Wait for card ready                                                   */
/*-----------------------------------------------------------------------*/

static int wait_ready (  /* 1:Ready, 0:Timeout */
  UINT wt     /* Timeout [ms] */
) {
  BYTE d;

  timeout = millis() + wt;
  do {
    d = xchg_spi(0xFF);
    /* This loop takes a while. Insert rot_rdq() here for multitask environment. */
  } while (d != 0xFF && (timeout > millis()));  /* Wait for card goes ready or timeout */

  return (d == 0xFF) ? 1 : 0;
}

/*-----------------------------------------------------------------------*/
/* Deselect card and release SPI                                         */
/*-----------------------------------------------------------------------*/

static void deselect() {
  CS_HIGH();    /* CS = H */
  xchg_spi(0xFF); /* Dummy clock (force DO hi-z for multiple slave SPI) */
}

/*-----------------------------------------------------------------------*/
/* Select card and wait for ready                                        */
/*-----------------------------------------------------------------------*/

static int select() { /* 1:OK, 0:Timeout */
  CS_LOW();   /* CS = L */
  xchg_spi(0xFF); /* Dummy clock (force DO enabled) */

  if (wait_ready(500)) return 1;  /* Leading busy check: Wait for card ready */

  deselect();   /* Timeout */
  return 0;
}

/*-----------------------------------------------------------------------*/
/* Control SPI module (Platform dependent)                               */
/*-----------------------------------------------------------------------*/

static void power_on() {  /* Enable SSP module and attach it to I/O pads */
  ONBOARD_SD_SPI.setModule(ON_BOARD_SPI_DEVICE);
  ONBOARD_SD_SPI.begin();
  ONBOARD_SD_SPI.setBitOrder(MSBFIRST);
  ONBOARD_SD_SPI.setDataMode(SPI_MODE0);
  OUT_WRITE(ONBOARD_SD_CS_PIN, HIGH); /* Set CS# high */
}

static void power_off() {   /* Disable SPI function */
  select();       /* Wait for card ready */
  deselect();
}

/*-----------------------------------------------------------------------*/
/* Receive a data packet from the MMC                                    */
/*-----------------------------------------------------------------------*/

static int rcvr_datablock (  /* 1:OK, 0:Error */
  BYTE *buff,     /* Data buffer */
  UINT btr      /* Data block length (byte) */
) {
  BYTE token;

  timeout = millis() + 200;
  do {              /* Wait for DataStart token in timeout of 200ms */
    token = xchg_spi(0xFF);
    /* This loop will take a while. Insert rot_rdq() here for multitask environment. */
  } while ((token == 0xFF) && (timeout > millis()));
  if (token != 0xFE) return 0;   /* Function fails if invalid DataStart token or timeout */

  rcvr_spi_multi(buff, btr);    /* Store trailing data to the buffer */
  xchg_spi(0xFF); xchg_spi(0xFF); /* Discard CRC */

  return 1;           /* Function succeeded */
}

/*-----------------------------------------------------------------------*/
/* Send a data packet to the MMC                                         */
/*-----------------------------------------------------------------------*/

#if _DISKIO_WRITE

  static int xmit_datablock (  /* 1:OK, 0:Failed */
    const BYTE *buff, /* Ponter to 512 byte data to be sent */
    BYTE token      /* Token */
  ) {
    BYTE resp;

    if (!wait_ready(500)) return 0;   /* Leading busy check: Wait for card ready to accept data block */

    xchg_spi(token);          /* Send token */
    if (token == 0xFD) return 1;    /* Do not send data if token is StopTran */

    xmit_spi_multi(buff, 512);      /* Data */
    xchg_spi(0xFF); xchg_spi(0xFF);   /* Dummy CRC */

    resp = xchg_spi(0xFF);        /* Receive data resp */

    return (resp & 0x1F) == 0x05 ? 1 : 0; /* Data was accepted or not */

    /* Busy check is done at next transmission */
  }

#endif // _DISKIO_WRITE

/*-----------------------------------------------------------------------*/
/* Send a command packet to the MMC                                      */
/*-----------------------------------------------------------------------*/

static BYTE send_cmd (   /* Return value: R1 resp (bit7==1:Failed to send) */
  BYTE cmd,   /* Command index */
  DWORD arg   /* Argument */
) {
  BYTE n, res;

  if (cmd & 0x80) { /* Send a CMD55 prior to ACMD<n> */
    cmd &= 0x7F;
    res = send_cmd(CMD55, 0);
    if (res > 1) return res;
  }

  /* Select the card and wait for ready except to stop multiple block read */
  if (cmd != CMD12) {
    deselect();
    if (!select()) return 0xFF;
  }

  /* Send command packet */
  xchg_spi(0x40 | cmd);       /* Start + command index */
  xchg_spi((BYTE)(arg >> 24));    /* Argument[31..24] */
  xchg_spi((BYTE)(arg >> 16));    /* Argument[23..16] */
  xchg_spi((BYTE)(arg >> 8));     /* Argument[15..8] */
  xchg_spi((BYTE)arg);        /* Argument[7..0] */
  n = 0x01;             /* Dummy CRC + Stop */
  if (cmd == CMD0) n = 0x95;      /* Valid CRC for CMD0(0) */
  if (cmd == CMD8) n = 0x87;      /* Valid CRC for CMD8(0x1AA) */
  xchg_spi(n);

  /* Receive command resp */
  if (cmd == CMD12) xchg_spi(0xFF); /* Diacard following one byte when CMD12 */
  n = 10;               /* Wait for response (10 bytes max) */
  do
    res = xchg_spi(0xFF);
  while ((res & 0x80) && --n);

  return res;             /* Return received response */
}

/*--------------------------------------------------------------------------
   Public Functions
---------------------------------------------------------------------------*/

/*-----------------------------------------------------------------------*/
/* Initialize disk drive                                                 */
/*-----------------------------------------------------------------------*/

DSTATUS disk_initialize (
  BYTE drv    /* Physical drive number (0) */
) {
  BYTE n, cmd, ty, ocr[4];

  if (drv) return STA_NOINIT;     /* Supports only drive 0 */
  power_on();             /* Initialize SPI */

  if (Stat & STA_NODISK) return Stat; /* Is a card existing in the soket? */

  FCLK_SLOW();
  for (n = 10; n; n--) xchg_spi(0xFF);  /* Send 80 dummy clocks */

  ty = 0;
  if (send_cmd(CMD0, 0) == 1) {     /* Put the card SPI state */
    timeout = millis() + 1000;            /* Initialization timeout = 1 sec */
    if (send_cmd(CMD8, 0x1AA) == 1) { /* Is the catd SDv2? */
      for (n = 0; n < 4; n++) ocr[n] = xchg_spi(0xFF);  /* Get 32 bit return value of R7 resp */
      if (ocr[2] == 0x01 && ocr[3] == 0xAA) {       /* Does the card support 2.7-3.6V? */
        while ((timeout > millis()) && send_cmd(ACMD41, 1UL << 30)) ; /* Wait for end of initialization with ACMD41(HCS) */
        if ((timeout > millis()) && send_cmd(CMD58, 0) == 0) {    /* Check CCS bit in the OCR */
          for (n = 0; n < 4; n++) ocr[n] = xchg_spi(0xFF);
          ty = (ocr[0] & 0x40) ? CT_SD2 | CT_BLOCK : CT_SD2;  /* Check if the card is SDv2 */
        }
      }
    } else {  /* Not an SDv2 card */
      if (send_cmd(ACMD41, 0) <= 1)   { /* SDv1 or MMCv3? */
        ty = CT_SD1; cmd = ACMD41;  /* SDv1 (ACMD41(0)) */
      } else {
        ty = CT_MMC; cmd = CMD1;  /* MMCv3 (CMD1(0)) */
      }
      while ((timeout > millis()) && send_cmd(cmd, 0)) ;    /* Wait for the card leaves idle state */
      if (!(timeout > millis()) || send_cmd(CMD16, 512) != 0) /* Set block length: 512 */
        ty = 0;
    }
  }
  CardType = ty;  /* Card type */
  deselect();

  if (ty) {   /* OK */
    FCLK_FAST();      /* Set fast clock */
    Stat &= ~STA_NOINIT;  /* Clear STA_NOINIT flag */
  } else {    /* Failed */
    power_off();
    Stat = STA_NOINIT;
  }

  return Stat;
}

/*-----------------------------------------------------------------------*/
/* Get disk status                                                       */
/*-----------------------------------------------------------------------*/

DSTATUS disk_status (
  BYTE drv    /* Physical drive number (0) */
) {
  if (drv) return STA_NOINIT;   /* Supports only drive 0 */
  return Stat;  /* Return disk status */
}

/*-----------------------------------------------------------------------*/
/* Read sector(s)                                                        */
/*-----------------------------------------------------------------------*/

DRESULT disk_read (
  BYTE drv,   /* Physical drive number (0) */
  BYTE *buff,   /* Pointer to the data buffer to store read data */
  DWORD sector, /* Start sector number (LBA) */
  UINT count    /* Number of sectors to read (1..128) */
) {
  BYTE cmd;

  if (drv || !count) return RES_PARERR;   /* Check parameter */
  if (Stat & STA_NOINIT) return RES_NOTRDY; /* Check if drive is ready */
  if (!(CardType & CT_BLOCK)) sector *= 512;  /* LBA ot BA conversion (byte addressing cards) */
  FCLK_FAST();
  cmd = count > 1 ? CMD18 : CMD17;      /*  READ_MULTIPLE_BLOCK : READ_SINGLE_BLOCK */
  if (send_cmd(cmd, sector) == 0) {
    do {
      if (!rcvr_datablock(buff, 512)) break;
      buff += 512;
    } while (--count);
    if (cmd == CMD18) send_cmd(CMD12, 0); /* STOP_TRANSMISSION */
  }
  deselect();

  return count ? RES_ERROR : RES_OK;  /* Return result */
}

/*-----------------------------------------------------------------------*/
/* Write sector(s)                                                       */
/*-----------------------------------------------------------------------*/

#if _DISKIO_WRITE

  DRESULT disk_write(
    BYTE drv,     /* Physical drive number (0) */
    const BYTE *buff, /* Ponter to the data to write */
    DWORD sector,   /* Start sector number (LBA) */
    UINT count      /* Number of sectors to write (1..128) */
  ) {
    if (drv || !count) return RES_PARERR;   /* Check parameter */
    if (Stat & STA_NOINIT) return RES_NOTRDY; /* Check drive status */
    if (Stat & STA_PROTECT) return RES_WRPRT; /* Check write protect */
    FCLK_FAST();
    if (!(CardType & CT_BLOCK)) sector *= 512;  /* LBA ==> BA conversion (byte addressing cards) */

    if (count == 1) { /* Single sector write */
      if ((send_cmd(CMD24, sector) == 0)  /* WRITE_BLOCK */
        && xmit_datablock(buff, 0xFE)) {
        count = 0;
      }
    }
    else {        /* Multiple sector write */
      if (CardType & CT_SDC) send_cmd(ACMD23, count); /* Predefine number of sectors */
      if (send_cmd(CMD25, sector) == 0) { /* WRITE_MULTIPLE_BLOCK */
        do {
          if (!xmit_datablock(buff, 0xFC)) break;
          buff += 512;
        } while (--count);
        if (!xmit_datablock(0, 0xFD)) count = 1;  /* STOP_TRAN token */
      }
    }
    deselect();

    return count ? RES_ERROR : RES_OK;  /* Return result */
  }

#endif // _DISKIO_WRITE

/*-----------------------------------------------------------------------*/
/* Miscellaneous drive controls other than data read/write               */
/*-----------------------------------------------------------------------*/

#if _DISKIO_IOCTL

  DRESULT disk_ioctl (
    BYTE drv,   /* Physical drive number (0) */
    BYTE cmd,   /* Control command code */
    void *buff    /* Pointer to the conrtol data */
  ) {
    DRESULT res;
    BYTE n, csd[16], *ptr = (BYTE *)buff;
    DWORD *dp, st, ed, csize;
    #if _DISKIO_ISDIO
      SDIO_CMD *sdio = buff;
      BYTE rc, *buf;
      UINT dc;
    #endif

    if (drv) return RES_PARERR;         /* Check parameter */
    if (Stat & STA_NOINIT) return RES_NOTRDY; /* Check if drive is ready */

    res = RES_ERROR;
    FCLK_FAST();
    switch (cmd) {
      case CTRL_SYNC:     /* Wait for end of internal write process of the drive */
        if (select()) res = RES_OK;
        break;

      case GET_SECTOR_COUNT:  /* Get drive capacity in unit of sector (DWORD) */
        if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16)) {
          if ((csd[0] >> 6) == 1) { /* SDC ver 2.00 */
            csize = csd[9] + ((WORD)csd[8] << 8) + ((DWORD)(csd[7] & 63) << 16) + 1;
            *(DWORD*)buff = csize << 10;
          } else {          /* SDC ver 1.XX or MMC ver 3 */
            n = (csd[5] & 15) + ((csd[10] & 128) >> 7) + ((csd[9] & 3) << 1) + 2;
            csize = (csd[8] >> 6) + ((WORD)csd[7] << 2) + ((WORD)(csd[6] & 3) << 10) + 1;
            *(DWORD*)buff = csize << (n - 9);
          }
          res = RES_OK;
        }
        break;

      case GET_BLOCK_SIZE:  /* Get erase block size in unit of sector (DWORD) */
        if (CardType & CT_SD2) {  /* SDC ver 2.00 */
          if (send_cmd(ACMD13, 0) == 0) { /* Read SD status */
            xchg_spi(0xFF);
            if (rcvr_datablock(csd, 16)) {        /* Read partial block */
              for (n = 64 - 16; n; n--) xchg_spi(0xFF); /* Purge trailing data */
              *(DWORD*)buff = 16UL << (csd[10] >> 4);
              res = RES_OK;
            }
          }
        } else {          /* SDC ver 1.XX or MMC */
          if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16)) {  /* Read CSD */
            if (CardType & CT_SD1) {  /* SDC ver 1.XX */
              *(DWORD*)buff = (((csd[10] & 63) << 1) + ((WORD)(csd[11] & 128) >> 7) + 1) << ((csd[13] >> 6) - 1);
            } else {          /* MMC */
              *(DWORD*)buff = ((WORD)((csd[10] & 124) >> 2) + 1) * (((csd[11] & 3) << 3) + ((csd[11] & 224) >> 5) + 1);
            }
            res = RES_OK;
          }
        }
        break;

      case CTRL_TRIM:   /* Erase a block of sectors (used when _USE_TRIM in ffconf.h is 1) */
        if (!(CardType & CT_SDC)) break;        /* Check if the card is SDC */
        if (disk_ioctl(drv, MMC_GET_CSD, csd)) break; /* Get CSD */
        if (!(csd[0] >> 6) && !(csd[10] & 0x40)) break; /* Check if sector erase can be applied to the card */
        dp = (DWORD *)buff; st = dp[0]; ed = dp[1];       /* Load sector block */
        if (!(CardType & CT_BLOCK)) {
          st *= 512; ed *= 512;
        }
        if (send_cmd(CMD32, st) == 0 && send_cmd(CMD33, ed) == 0 && send_cmd(CMD38, 0) == 0 && wait_ready(30000)) { /* Erase sector block */
          res = RES_OK; /* FatFs does not check result of this command */
        }
        break;

      /* Following commands are never used by FatFs module */

      case MMC_GET_TYPE:    /* Get MMC/SDC type (BYTE) */
        *ptr = CardType;
        res = RES_OK;
        break;

      case MMC_GET_CSD:   /* Read CSD (16 bytes) */
        if (send_cmd(CMD9, 0) == 0 && rcvr_datablock(ptr, 16)) {  /* READ_CSD */
          res = RES_OK;
        }
        break;

      case MMC_GET_CID:   /* Read CID (16 bytes) */
        if (send_cmd(CMD10, 0) == 0 && rcvr_datablock(ptr, 16)) { /* READ_CID */
          res = RES_OK;
        }
        break;

      case MMC_GET_OCR:   /* Read OCR (4 bytes) */
        if (send_cmd(CMD58, 0) == 0) {  /* READ_OCR */
          for (n = 4; n; n--) *ptr++ = xchg_spi(0xFF);
          res = RES_OK;
        }
        break;

      case MMC_GET_SDSTAT:  /* Read SD status (64 bytes) */
        if (send_cmd(ACMD13, 0) == 0) { /* SD_STATUS */
          xchg_spi(0xFF);
          if (rcvr_datablock(ptr, 64)) res = RES_OK;
        }
        break;

      #if _DISKIO_ISDIO

        case ISDIO_READ:
          sdio = buff;
          if (send_cmd(CMD48, 0x80000000 | sdio->func << 28 | sdio->addr << 9 | ((sdio->ndata - 1) & 0x1FF)) == 0) {
            for (Timer1 = 1000; (rc = xchg_spi(0xFF)) == 0xFF && Timer1; ) ;
            if (rc == 0xFE) {
              for (buf = sdio->data, dc = sdio->ndata; dc; dc--) *buf++ = xchg_spi(0xFF);
              for (dc = 514 - sdio->ndata; dc; dc--) xchg_spi(0xFF);
              res = RES_OK;
            }
          }
          break;
        case ISDIO_WRITE:
          sdio = buff;
          if (send_cmd(CMD49, 0x80000000 | sdio->func << 28 | sdio->addr << 9 | ((sdio->ndata - 1) & 0x1FF)) == 0) {
            xchg_spi(0xFF); xchg_spi(0xFE);
            for (buf = sdio->data, dc = sdio->ndata; dc; dc--) xchg_spi(*buf++);
            for (dc = 514 - sdio->ndata; dc; dc--) xchg_spi(0xFF);
            if ((xchg_spi(0xFF) & 0x1F) == 0x05) res = RES_OK;
          }
          break;
        case ISDIO_MRITE:
          sdio = buff;
          if (send_cmd(CMD49, 0x84000000 | sdio->func << 28 | sdio->addr << 9 | sdio->ndata >> 8) == 0) {
            xchg_spi(0xFF); xchg_spi(0xFE);
            xchg_spi(sdio->ndata);
            for (dc = 513; dc; dc--) xchg_spi(0xFF);
            if ((xchg_spi(0xFF) & 0x1F) == 0x05) res = RES_OK;
          }
          break;

      #endif // _DISKIO_ISDIO

      default: res = RES_PARERR;
    }

    deselect();
    return res;
  }

#endif // _DISKIO_IOCTL

#endif // HAS_ONBOARD_SD