sbi_mmc.c

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/*
 * Copyright (C) 2006 by egnite Software GmbH
 * Copyright (C) 2008 by egnite GmbH
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS 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.
 *
 * For additional information see http://www.ethernut.de/
 */


#if defined(MMC_CLK_PIO_BIT) && defined(MMC_CLK_PIO_ID)
#undef GPIO_ID
#define GPIO_ID MMC_CLK_PIO_ID
#include <cfg/arch/porttran.h>
static INLINE void MMC_CLK_LO(void) { GPIO_SET_LO(MMC_CLK_PIO_BIT); }
static INLINE void MMC_CLK_HI(void) { GPIO_SET_HI(MMC_CLK_PIO_BIT); }
static INLINE void MMC_CLK_EN(void) { GPIO_ENABLE(MMC_CLK_PIO_BIT); }
static INLINE void MMC_CLK_SO(void) { GPIO_OUTPUT(MMC_CLK_PIO_BIT); }
#else
#define MMC_CLK_LO()
#define MMC_CLK_HI()
#define MMC_CLK_EN()
#define MMC_CLK_SO()
#endif

#if defined(MMC_MOSI_PIO_BIT) && defined(MMC_MOSI_PIO_ID)
#undef GPIO_ID
#define GPIO_ID    MMC_MOSI_PIO_ID
#include <cfg/arch/porttran.h>
static INLINE void MMC_MOSI_LO(void) { GPIO_SET_LO(MMC_MOSI_PIO_BIT); }
static INLINE void MMC_MOSI_HI(void) { GPIO_SET_HI(MMC_MOSI_PIO_BIT); }
static INLINE void MMC_MOSI_EN(void) { GPIO_ENABLE(MMC_MOSI_PIO_BIT); }
static INLINE void MMC_MOSI_SO(void) { GPIO_OUTPUT(MMC_MOSI_PIO_BIT); }
#else
#define MMC_MOSI_LO()
#define MMC_MOSI_HI()
#define MMC_MOSI_EN()
#define MMC_MOSI_SO()
#endif

#if defined(MMC_MISO_PIO_BIT) && defined(MMC_MISO_PIO_ID)
#undef GPIO_ID
#define GPIO_ID    MMC_MISO_PIO_ID
#include <cfg/arch/porttran.h>
static INLINE int MMC_MISO_TEST(void) { return GPIO_GET(MMC_MISO_PIO_BIT); }
static INLINE void MMC_MISO_EN(void) { GPIO_ENABLE(MMC_MISO_PIO_BIT); }
static INLINE void MMC_MISO_SI(void) { GPIO_INPUT(MMC_MISO_PIO_BIT); }
#else
#define MMC_MISO_TEST() (1)
#define MMC_MISO_EN()
#define MMC_MISO_SI()
#endif

#if defined(MMC_CS_PIO_BIT) && defined(MMC_CS_PIO_ID)
#undef GPIO_ID
#define GPIO_ID    MMC_CS_PIO_ID
#include <cfg/arch/porttran.h>
static INLINE void MMC_CS_LO(void) { GPIO_SET_LO(MMC_CS_PIO_BIT); }
static INLINE void MMC_CS_HI(void) { GPIO_SET_HI(MMC_CS_PIO_BIT); }
static INLINE int MMC_CS_IS(void) { return GPIO_IS_HI(MMC_CS_PIO_BIT); }
static INLINE void MMC_CS_EN(void) { GPIO_ENABLE(MMC_CS_PIO_BIT); }
static INLINE void MMC_CS_SO(void) { GPIO_OUTPUT(MMC_CS_PIO_BIT); }
#else
#define MMC_CS_LO()
#define MMC_CS_HI()
#define MMC_CS_IS()    (1)
#define MMC_CS_EN()
#define MMC_CS_SO()
#endif


typedef struct _MMCDCB {
    int dcb_avail;              
    int dcb_changed;            
} MMCDCB;

static MMCDCB mmc_dcb;

static int SbiMmCardInit(void)
{
    mmc_dcb.dcb_changed = 0;
    if (mmc_dcb.dcb_avail) {
        return 0;
    }
    return -1;
}

static int SbiMmCardSelect(int on)
{
    int rc = MMC_CS_IS();

    /* MMC select is low active. */
    if (on == 1) {
        MMC_CS_LO();
    } else if (on == 0) {
        MMC_CS_HI();
    }
    return rc;
}

static uint8_t SbiMmCardIo(uint8_t val)
{
    uint_fast8_t msk = 0x80;

#if defined(NUTDEBUG)
    putchar('[');
    if (val != 0xFF) {
        printf("s%02X", val);
    }
#endif

    /* SPI bit banging. */
    while (msk) {
        MMC_CLK_LO();
        if (val & msk) {
            MMC_MOSI_HI();
        } else {
            MMC_MOSI_LO();
        }
        _NOP(); _NOP(); _NOP(); _NOP();
        _NOP(); _NOP(); _NOP(); _NOP();
        _NOP(); _NOP(); _NOP(); _NOP();
        _NOP(); _NOP(); _NOP(); _NOP();
        MMC_CLK_HI();
        if (MMC_MISO_TEST()) {
            val |= msk;
        }
        else {
            val &= ~msk;
        }
        msk >>= 1;
    }

#if defined(NUTDEBUG)
    if (val != 0xFF) {
        printf("r%02X", val);
    }
    putchar(']');
#endif
    return val;
}

static int SbiMmCardAvail(void)
{
    if (mmc_dcb.dcb_avail) {
        if (mmc_dcb.dcb_changed) {
            return 2;
        }
        return 1;
    }
    return 0;
}

static int SbiMmCardWrProt(void)
{
    return 0;
}

static int SbiMmcIfcInit(NUTDEVICE * dev)
{
    /* Enable all clocks. */
#if defined(PMC_PCER)
#if defined(MMC_CLK_PIO_ID)
    outr(PMC_PCER, _BV(MMC_CLK_PIO_ID));
#endif
#if defined(MMC_MOSI_PIO_ID)
    outr(PMC_PCER, _BV(MMC_MOSI_PIO_ID));
#endif
#if defined(MMC_MISO_PIO_ID)
    outr(PMC_PCER, _BV(MMC_MISO_PIO_ID));
#endif
#if defined(MMC_CS_PIO_ID)
    outr(PMC_PCER, _BV(MMC_CS_PIO_ID));
#endif
#if defined(MMC_CD_PIO_ID)
    outr(PMC_PCER, _BV(MMC_CD_PIO_ID));
#endif
#if defined(MMC_WP_PIO_ID)
    outr(PMC_PCER, _BV(MMC_WP_PIO_ID));
#endif
#endif /* PMC_PCER */

    /* Set all outputs high. */
    MMC_CLK_HI();
    MMC_MOSI_HI();
    MMC_CS_HI();

    /* Enable GPIO on all lines. */
    MMC_CLK_EN();
    MMC_MOSI_EN();
    MMC_MISO_EN();
    MMC_CS_EN();

    /* Set line directions. */
    MMC_CLK_SO();
    MMC_MOSI_SO();
    MMC_MISO_SI();
    MMC_CS_SO();

    mmc_dcb.dcb_avail = 1;
    mmc_dcb.dcb_changed = 0;

    return MmCardDevInit(dev);
}

static MMCIFC mmc_ifc = {
    SbiMmCardInit,             
    SbiMmCardIo,               
    SbiMmCardSelect,           
    SbiMmCardAvail,            
    SbiMmCardWrProt            
};

NUTDEVICE devSbiMmCard = {
    0,                  
    MMC_DEV_NAME,       
    0,                  
    0,                  
    0,                  
    &mmc_ifc,           
    &mmc_dcb,           
    SbiMmcIfcInit,      
    MmCardIOCtl,        
    MmCardBlockRead,    
    MmCardBlockWrite,   
#ifdef __HARVARD_ARCH__
    MmCardBlockWrite_P, 
#endif
    MmCardMount,        
    MmCardUnmount,      
    0                   
};