/**
  ******************************************************************************
  * @file    sd_diskio.c
  * @author  MCD Application Team
  * @version V1.3.0
  * @date    08-May-2015
  * @brief   SD Disk I/O driver
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2015 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include <string.h>
#include "ff_gen_drv.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Block Size in Bytes */
#define BLOCK_SIZE                512

/* Private variables ---------------------------------------------------------*/
/* Disk status */
static volatile DSTATUS Stat = STA_NOINIT;

/* Private function prototypes -----------------------------------------------*/
DSTATUS SD_initialize (BYTE);
DSTATUS SD_status (BYTE);
DRESULT SD_read (BYTE, BYTE*, DWORD, UINT);
#if _USE_WRITE == 1
  DRESULT SD_write (BYTE, const BYTE*, DWORD, UINT);
#endif /* _USE_WRITE == 1 */
#if _USE_IOCTL == 1
  DRESULT SD_ioctl (BYTE, BYTE, void*);
#endif  /* _USE_IOCTL == 1 */

const Diskio_drvTypeDef  SD_Driver =
{
  SD_initialize,
  SD_status,
  SD_read,
#if  _USE_WRITE == 1
  SD_write,
#endif /* _USE_WRITE == 1 */

#if  _USE_IOCTL == 1
  SD_ioctl,
#endif /* _USE_IOCTL == 1 */
};

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Initializes a Drive
  * @param  lun : not used
  * @retval DSTATUS: Operation status
  */
DSTATUS SD_initialize(BYTE lun)
{
  Stat = STA_NOINIT;

  /* Configure the uSD device */
  if(BSP_SD_Init() == MSD_OK)
  {
    Stat &= ~STA_NOINIT;
  }

  return Stat;
}

/**
  * @brief  Gets Disk Status
  * @param  lun : not used
  * @retval DSTATUS: Operation status
  */
DSTATUS SD_status(BYTE lun)
{
  Stat = STA_NOINIT;

  if(BSP_SD_GetStatus() == MSD_OK)
  {
    Stat &= ~STA_NOINIT;
  }

  return Stat;
}

/**
  * @brief  Reads Sector(s)
  * @param  lun : not used
  * @param  *buff: Data buffer to store read data
  * @param  sector: Sector address (LBA)
  * @param  count: Number of sectors to read (1..128)
  * @retval DRESULT: Operation result
  */
DRESULT SD_read(BYTE lun, BYTE *buff, DWORD sector, UINT count)
{
    DRESULT res = RES_OK;

    if(BSP_SD_ReadBlocks_DMA((uint32_t*)buff,
                       (uint64_t) (sector * BLOCK_SIZE),
                       BLOCK_SIZE,
                       count) != MSD_OK)
    {
        res = RES_ERROR;
    }

    //NB:
    //  If DMA is in use, BSP_SD_ReadBlocks_DMA is to be called instead of BSP_SD_ReadBlocks.
    //  (Its implementation is actually blocking in the CubeF7 BSP).
    //  Anyway, to provide cache coherence, a call SCB_InvalidateDCache() should be added
    //  after the DMA read operation! Uncomment it below. (EU1KY)
    SCB_InvalidateDCache_by_Addr((uint32_t*)buff, (int32_t)(count * BLOCK_SIZE));
    return res;
}

/**
  * @brief  Writes Sector(s)
  * @param  lun : not used
  * @param  *buff: Data to be written
  * @param  sector: Sector address (LBA)
  * @param  count: Number of sectors to write (1..128)
  * @retval DRESULT: Operation result
  */
#if _USE_WRITE == 1
DRESULT SD_write(BYTE lun, const BYTE *buff, DWORD sector, UINT count)
{
    DRESULT res = RES_OK;

    //NB:
    //  If DMA is in use, by calling BSP_SD_WriteBlocks_DMA()
    //  (this function is actually blocking in CubeF7 BSP implementation),
    //  the D-cache must be flushed before the DMA write operation start.
    //  Uncomment the line below in this case! (EU1KY)
    SCB_CleanDCache_by_Addr((uint32_t*)buff, (int32_t)(count * BLOCK_SIZE));

    if(BSP_SD_WriteBlocks_DMA((uint32_t*)buff,
                        (uint64_t)(sector * BLOCK_SIZE),
                        BLOCK_SIZE, count) != MSD_OK)
    {
        res = RES_ERROR;
    }
    return res;
}
#endif /* _USE_WRITE == 1 */

/**
  * @brief  I/O control operation
  * @param  lun : not used
  * @param  cmd: Control code
  * @param  *buff: Buffer to send/receive control data
  * @retval DRESULT: Operation result
  */
#if _USE_IOCTL == 1
DRESULT SD_ioctl(BYTE lun, BYTE cmd, void *buff)
{
  DRESULT res = RES_ERROR;
  SD_CardInfo CardInfo;

  if (Stat & STA_NOINIT) return RES_NOTRDY;

  switch (cmd)
  {
  /* Make sure that no pending write process */
  case CTRL_SYNC :
    res = RES_OK;
    break;

  /* Get number of sectors on the disk (DWORD) */
  case GET_SECTOR_COUNT :
    BSP_SD_GetCardInfo(&CardInfo);
    *(DWORD*)buff = CardInfo.CardCapacity / BLOCK_SIZE;
    res = RES_OK;
    break;

  /* Get R/W sector size (WORD) */
  case GET_SECTOR_SIZE :
    *(WORD*)buff = BLOCK_SIZE;
    res = RES_OK;
    break;

  /* Get erase block size in unit of sector (DWORD) */
  case GET_BLOCK_SIZE :
    *(DWORD*)buff = BLOCK_SIZE;
    break;

  default:
    res = RES_PARERR;
  }

  return res;
}
#endif /* _USE_IOCTL == 1 */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

