/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support
 * ----------------------------------------------------------------------------
 * Copyright (c) 2008, Atmel Corporation
 *
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//------------------------------------------------------------------------------
/// \page "mci"
///
/// !Purpose
///  
/// This file provides a basic API for MCI configuration and send command from host through MCI. 
/// User can control device such as SD memory card, SDIO, MMC card through these interface. 
///
/// !Usage
///
/// -# Use MCI_Init() to initialize MCI controller.
/// -# Use MCI_SetSpeed() to set the MCI clock.
/// -# Use MCI_SetBusWidth() to set the bus width between MCI controller and device.
/// -# MCI_SendCommand() is used for host to send command to device through MCI interface.
/// -# MCI_Handler() is the interrupt service routine.
///
/// !Functions
///
/// -# MCI_Init: Initializes a MCI driver instance and the underlying peripheral.
/// -# MCI_SetSpeed : Configure the  MCI CLKDIV in the MCI_MR register.
/// -# MCI_SendCommand: Starts a MCI  transfer.
/// -# MCI_Handler : Interrupt handler which is called by ISR handler.
/// -# MCI_SetBusWidth : Configure the  MCI SDCBUS in the MCI_SDCR register.
//------------------------------------------------------------------------------


#ifndef MCI_H
#define MCI_H

//------------------------------------------------------------------------------
//         Headers
//------------------------------------------------------------------------------

#include <board.h>

#define MCI_BUSY_CHECK_FIX      0

#if defined(AT91C_MCI_TRTYP_SDIO_BLOCK) && defined(AT91C_MCI_TRTYP_SDIO_BYTE)
#define MCI_SDIO_ENABLE         1
#else
#define MCI_SDIO_ENABLE         0
#endif

//------------------------------------------------------------------------------
//         Constants
//------------------------------------------------------------------------------

/// Transfer is pending.
#define MCI_STATUS_PENDING      1
/// Transfer has been aborted because an error occured.
#define MCI_STATUS_ERROR        2
/// Card did not answer command.
#define MCI_STATUS_NORESPONSE   3

/// MCI driver is currently in use.
#define MCI_ERROR_LOCK    1

/// MCI configuration with 1-bit data bus on slot A (for MMC cards).
#define MCI_MMC_SLOTA           (AT91C_MCI_SCDSEL_SLOTA | AT91C_MCI_SCDBUS_1BIT)
/// MCI configuration with 4-bit data bus on slot A (for SD cards).
#define MCI_SD_SLOTA            (AT91C_MCI_SCDSEL_SLOTA | AT91C_MCI_SCDBUS_4BITS)
#ifdef AT91C_MCI_SCDBUS_8BITS
/// MCI configuration with 1-bit data bus on slot A (for MMC cards).
#define MCI_MMC4_SLOTA          (AT91C_MCI_SCDSEL_SLOTA | AT91C_MCI_SCDBUS_8BITS)
#endif
#ifdef AT91C_MCI_SCDSEL_SLOTB
/// MCI configuration with 1-bit data bus on slot B (for MMC cards).
#define MCI_MMC_SLOTB           (AT91C_MCI_SCDSEL_SLOTB | AT91C_MCI_SCDBUS_1BIT)
/// MCI configuration with 4-bit data bus on slot B (for SD cards).
#define MCI_SD_SLOTB            (AT91C_MCI_SCDSEL_SLOTB | AT91C_MCI_SCDBUS_4BITS)
#ifdef AT91C_MCI_SCDBUS_8BITS
/// MCI configuration with 1-bit data bus on slot A (for MMC cards).
#define MCI_MMC4_SLOTB          (AT91C_MCI_SCDSEL_SLOTB | AT91C_MCI_SCDBUS_8BITS)
#endif
#else
#define MCI_MMC_SLOTB           MCI_MMC_SLOTA
#define MCI_SD_SLOTB            MCI_SD_SLOTA
#endif

/// Start new data transfer
#define MCI_NEW_TRANSFER        0
/// Continue data transfer
#define MCI_CONTINUE_TRANSFER   1
/// Stop data transfer
#define MCI_STOP_TRANSFER       2


/// MCI SD Bus Width 1-bit
#define MCI_SDCBUS_1BIT (0 << 7)
/// MCI SD Bus Width 4-bit
#define MCI_SDCBUS_4BIT (1 << 7)
/// MCI SD Bus Width 8-bit
#define MCI_SDCBUS_8BIT (3 << 6)

/// The MCI Clock Speed after initialize (400K)
#define MCI_INITIAL_SPEED       400000

#define MCI_INTERRUPT_MODE 0
#define MCI_POLLING_MODE   1

//------------------------------------------------------------------------------
//         Types
//------------------------------------------------------------------------------

/// MCI end-of-transfer callback function.
typedef void (*MciCallback)(unsigned char status, void *pCommand);

//------------------------------------------------------------------------------
/// MCI Transfer Request prepared by the application upper layer. This structure
/// is sent to the MCI_SendCommand function to start the transfer. At the end of
/// the transfer, the callback is invoked by the interrupt handler.
//------------------------------------------------------------------------------
typedef struct _MciCmd {

    /// Command code.
    unsigned int cmd;
    /// Command argument.
    unsigned int arg;
    /// Data buffer.
    unsigned char *pData;
    /// Size of data block in bytes.
    unsigned short blockSize;
    /// Number of blocks to be transfered
    unsigned short nbBlock;
    /// Response buffer.
    unsigned int  *pResp;
    /// Optional user-provided callback function.
    MciCallback callback;
    /// Optional argument to the callback function.
    void *pArg;

    /// SD card response type.
    unsigned char  resType;
    /// Indicate if there is data transfer
    unsigned char dataTran;
    /// Indicate if continue to transfer data
    unsigned char tranType;
    /// Indicates if the command is a read operation.
    unsigned char isRead;

    /// Command status.
    volatile int status;
} MciCmd;

//------------------------------------------------------------------------------
/// MCI driver structure. Holds the internal state of the MCI driver and
/// prevents parallel access to a MCI peripheral.
//------------------------------------------------------------------------------
typedef struct {

    /// Pointer to a MCI peripheral.
    AT91S_MCI *pMciHw;
    /// Pointer to currently executing command.
    MciCmd *pCommand;
    /// MCI peripheral identifier.
    unsigned char mciId;
    /// MCI HW support mode
    unsigned char mciMode;
    /// Mutex.
    volatile char semaphore;
    /// interrupt or polling mode
    unsigned int bPolling;
} Mci;

//------------------------------------------------------------------------------
//         Global functions
//------------------------------------------------------------------------------

extern void MCI_Init(
    Mci *pMci,
    AT91PS_MCI pMciHw,
    unsigned char mciId,
    unsigned int mode,
    unsigned int bPolling);

extern unsigned int MCI_GetSpeed(Mci *pMci, unsigned int *mciDiv);

extern unsigned int MCI_SetSpeed(Mci *pMci,
                                 unsigned int mciSpeed,
                                 unsigned int mciLimit,
                                 unsigned int mck);

extern unsigned char MCI_SendCommand(Mci *pMci, MciCmd *pMciCmd);

extern void MCI_Handler(Mci *pMci);

extern unsigned char MCI_IsTxComplete(Mci *pMci);

extern unsigned char MCI_CheckBusy(Mci *pMci);

extern void MCI_Close(Mci *pMci);

extern void MCI_EnableHsMode(Mci * pMci, unsigned char hsEnable);

extern void MCI_SetBusWidth(Mci *pMci, unsigned char busWidth);

#endif //#ifndef MCI_H

