mci.c

at91sam7a3 keil下sdcard驱动

/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support
 * ----------------------------------------------------------------------------
 * Copyright (c) 2008, Atmel Corporation
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Atmel's name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ----------------------------------------------------------------------------
 */

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

#include "mci.h"
#include <utility/assert.h>
#include <utility/trace.h>

//------------------------------------------------------------------------------
//         Local constants
//------------------------------------------------------------------------------

/// Bit mask for status register errors.
#define STATUS_ERRORS (AT91C_MCI_UNRE  \
                       | AT91C_MCI_OVRE \
                       | AT91C_MCI_DTOE \
                       | AT91C_MCI_DCRCE \
                       | AT91C_MCI_RTOE \
                       | AT91C_MCI_RENDE \
                       | AT91C_MCI_RCRCE \
                       | AT91C_MCI_RDIRE \
                       | AT91C_MCI_RINDE)

/// MCI data timeout configuration with 1048576 MCK cycles between 2 data transfers.
#define DTOR_1MEGA_CYCLES           (AT91C_MCI_DTOCYC | AT91C_MCI_DTOMUL)

/// MCI MR: disable MCI Clock when FIFO is full
#ifndef AT91C_MCI_WRPROOF
    #define AT91C_MCI_WRPROOF 0
#endif
#ifndef AT91C_MCI_RDPROOF
    #define AT91C_MCI_RDPROOF 0
#endif

#define SDCARD_APP_OP_COND_CMD      (41 | AT91C_MCI_SPCMD_NONE  | AT91C_MCI_RSPTYP_48   | AT91C_MCI_TRCMD_NO )
#define MMC_SEND_OP_COND_CMD        (1  | AT91C_MCI_TRCMD_NO    | AT91C_MCI_SPCMD_NONE  | AT91C_MCI_RSPTYP_48 | AT91C_MCI_OPDCMD)


#define DISABLE    0    // Disable MCI interface
#define ENABLE     1    // Enable MCI interface


//------------------------------------------------------------------------------
//         Local macros
//------------------------------------------------------------------------------

/// Used to write in PMC registers.
#define WRITE_PMC(pPmc, regName, value)     pPmc->regName = (value)

/// Used to write in MCI registers.
#define WRITE_MCI(pMci, regName, value)     pMci->regName = (value)

/// Used to read from MCI registers.
#define READ_MCI(pMci, regName)             (pMci->regName)

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

//------------------------------------------------------------------------------
/// Enable/disable a MCI driver instance.
/// \param pMci  Pointer to a MCI driver instance.
/// \param enb  0 for disable MCI and 1 for enable MCI.
//------------------------------------------------------------------------------
void MCI_Enable(Mci *pMci, unsigned char enb)
{
    AT91S_MCI *pMciHw = pMci->pMciHw;

    SANITY_CHECK(pMci);
    SANITY_CHECK(pMci->pMciHw);

    // Set the Control Register: Enable/Disable MCI interface clock
    if(enb == DISABLE) {
        WRITE_MCI(pMciHw, MCI_CR, AT91C_MCI_MCIDIS);
    }
    else {
        WRITE_MCI(pMciHw, MCI_CR, AT91C_MCI_MCIEN);
    }
}

//------------------------------------------------------------------------------
/// Initializes a MCI driver instance and the underlying peripheral.
/// \param pMci  Pointer to a MCI driver instance.
/// \param pMciHw  Pointer to a MCI peripheral.
/// \param mciId  MCI peripheral identifier.
/// \param mode  Slot and type of connected card.
//------------------------------------------------------------------------------
void MCI_Init(
    Mci *pMci,
    AT91S_MCI *pMciHw,
    unsigned char mciId,
    unsigned int mode)
{
    unsigned short clkDiv;

    SANITY_CHECK(pMci);
    SANITY_CHECK(pMciHw);
    SANITY_CHECK((mode == MCI_MMC_SLOTA) || (mode == MCI_MMC_SLOTB)
                 || (mode == MCI_SD_SLOTA) || (mode == MCI_SD_SLOTB));

    // Initialize the MCI driver structure
    pMci->pMciHw = pMciHw;
    pMci->mciId  = mciId;
    pMci->semaphore = 1;
    pMci->pCommand = 0;

    // Enable the MCI clock
    WRITE_PMC(AT91C_BASE_PMC, PMC_PCER, (1 << mciId));

     // Reset the MCI
    WRITE_MCI(pMciHw, MCI_CR, AT91C_MCI_SWRST);

    // Disable the MCI
    WRITE_MCI(pMciHw, MCI_CR, AT91C_MCI_MCIDIS | AT91C_MCI_PWSDIS);

    // Disable all the interrupts
    WRITE_MCI(pMciHw, MCI_IDR, 0xFFFFFFFF);

    // Set the Data Timeout Register
    WRITE_MCI(pMciHw, MCI_DTOR, DTOR_1MEGA_CYCLES);

    // Set the Mode Register: 400KHz for MCK = 48MHz (CLKDIV = 58)
    clkDiv = (BOARD_MCK / (400000 * 2)) - 1;
    WRITE_MCI(pMciHw, MCI_MR, (clkDiv | (AT91C_MCI_PWSDIV & (0x7 << 8))));

    // Set the SDCard Register
    WRITE_MCI(pMciHw, MCI_SDCR, mode);

    // Enable the MCI and the Power Saving
    WRITE_MCI(pMciHw, MCI_CR, AT91C_MCI_MCIEN);

    // Disable the MCI peripheral clock.
    WRITE_PMC(AT91C_BASE_PMC, PMC_PCDR, (1 << mciId));
}

//------------------------------------------------------------------------------
/// Close a MCI driver instance and the underlying peripheral.
/// \param pMci  Pointer to a MCI driver instance.
/// \param pMciHw  Pointer to a MCI peripheral.
/// \param mciId  MCI peripheral identifier.
//------------------------------------------------------------------------------
void MCI_Close(Mci *pMci)
{
    AT91S_MCI *pMciHw = pMci->pMciHw;

    SANITY_CHECK(pMci);
    SANITY_CHECK(pMciHw);

    // Initialize the MCI driver structure
    pMci->semaphore = 1;
    pMci->pCommand = 0;

    // Disable the MCI peripheral clock.
    WRITE_PMC(AT91C_BASE_PMC, PMC_PCDR, (1 << pMci->mciId));

    // Disable the MCI
    WRITE_MCI(pMciHw, MCI_CR, AT91C_MCI_MCIDIS);

    // Disable all the interrupts
    WRITE_MCI(pMciHw, MCI_IDR, 0xFFFFFFFF);
}

//------------------------------------------------------------------------------
/// Configure the  MCI CLKDIV in the MCI_MR register. The max. for MCI clock is
/// MCK/2 and corresponds to CLKDIV = 0
/// \param pMci  Pointer to the low level MCI driver.
/// \param mciSpeed  MCI clock speed in Hz.
//------------------------------------------------------------------------------
void MCI_SetSpeed(Mci *pMci, unsigned int mciSpeed)
{
    AT91S_MCI *pMciHw = pMci->pMciHw;
    unsigned int mciMr;
    unsigned int clkdiv;

    SANITY_CHECK(pMci);
    SANITY_CHECK(pMci->pMciHw);

    // Set the Mode Register: 400KHz for MCK = 48MHz (CLKDIV = 58)
    mciMr = READ_MCI(pMciHw, MCI_MR) & (~AT91C_MCI_CLKDIV);

    // Multimedia Card Interface clock (MCCK or MCI_CK) is Master Clock (MCK)
    // divided by (2*(CLKDIV+1))
    if (mciSpeed > 0) {

        clkdiv = (BOARD_MCK / (mciSpeed * 2));
        if (clkdiv > 0) {

            clkdiv -= 1;
        }
        ASSERT( (clkdiv & 0xFFFFFF00) == 0, "mciSpeed too small");
    }
    else {

        clkdiv = 0;
    }

    WRITE_MCI(pMciHw, MCI_MR, mciMr | clkdiv);
}

//------------------------------------------------------------------------------
/// Configure the  MCI SDCBUS in the MCI_SDCR register. Only two modes available
///
/// \param pMci  Pointer to the low level MCI driver.
/// \param busWidth  MCI bus width mode.
//------------------------------------------------------------------------------
void MCI_SetBusWidth(Mci *pMci, unsigned char busWidth)
{
    AT91S_MCI *pMciHw = pMci->pMciHw;
    unsigned int mciSdcr;

    SANITY_CHECK(pMci);
    SANITY_CHECK(pMci->pMciHw);

    mciSdcr = (READ_MCI(pMciHw, MCI_SDCR) & ~(AT91C_MCI_SCDBUS));

    WRITE_MCI(pMciHw, MCI_SDCR, mciSdcr | busWidth);
}

//------------------------------------------------------------------------------
/// Starts a MCI  transfer. This is a non blocking function. It will return
/// as soon as the transfer is started.
/// Return 0 if successful; otherwise returns MCI_ERROR_LOCK if the driver is
/// already in use.
/// \param pMci  Pointer to an MCI driver instance.
/// \param pCommand  Pointer to the command to execute.
//------------------------------------------------------------------------------
unsigned char MCI_SendCommand(Mci *pMci, MciCmd *pCommand)
{
    AT91PS_MCI pMciHw = pMci->pMciHw;
    unsigned int mciIer, mciMr;

    SANITY_CHECK(pMci);
    SANITY_CHECK(pMciHw);
    SANITY_CHECK(pCommand);

    // Try to acquire the MCI semaphore
    if (pMci->semaphore == 0) {

        return MCI_ERROR_LOCK;
    }
    pMci->semaphore--;
    // TRACE_DEBUG("MCI_SendCommand %x %d\n\r", READ_MCI(pMciHw, MCI_SR), pCommand->cmd & 0x3f);

    // Command is now being executed
    pMci->pCommand = pCommand;
    pCommand->status = MCI_STATUS_PENDING;

    // Enable the MCI clock
    WRITE_PMC(AT91C_BASE_PMC, PMC_PCER, (1 << pMci->mciId));

    //Disable MCI clock, for multi-block data transfer
    MCI_Enable(pMci, DISABLE);

    // Set PDC data transfer direction
    if(pCommand->blockSize > 0) {
        if(pCommand->isRead) {
            WRITE_MCI(pMciHw, MCI_PTCR, AT91C_PDC_RXTEN);
        }
        else {
            WRITE_MCI(pMciHw, MCI_PTCR, AT91C_PDC_TXTEN);
        }
    }