2.3-InternetRadio/nutos/nut/dev/spi_at45d0.c

/*
 * Copyright (C) 2008-2009 by egnite GmbH
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 *    from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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/*!
 * \file dev/spi_at45d0.c
 * \brief First AT45D DataFlash device.
 *
 * \verbatim
 * $Id: spi_at45d0.c 5472 2013-12-06 00:16:28Z olereinhardt $
 * \endverbatim
 */

#include <cfg/memory.h>

#include <dev/blockdev.h>
#include <dev/spi_at45d.h>

#ifndef SPI_RATE_AT45D0
#define SPI_RATE_AT45D0  33000000
#endif

#ifndef SPI_MODE_AT45D0

#ifdef SPI_CSHIGH_AT45D0
#define SPI_MODE_AT45D0 (SPI_MODE_3 | SPI_MODE_CSHIGH)
#else
#define SPI_MODE_AT45D0 SPI_MODE_3
#endif

#elif defined(SPI_CSHIGH_AT45D0)

/* This is a tricky problem. Originally we didn't provide mode settings
** in the Configurator, but used mode 3 only. After experiencing problems
** with mode switching on the EIR, we need to set mode 0 for that board,
** which spoils our chip select polarity setting. */
#if SPI_MODE_AT45D0 == SPI_MODE_0
#undef SPI_MODE_AT45D0
#define SPI_MODE_AT45D0 (SPI_MODE_0 | SPI_MODE_CSHIGH)
#elif SPI_MODE_AT45D0 == SPI_MODE_3
#undef SPI_MODE_AT45D0
#define SPI_MODE_AT45D0 (SPI_MODE_3 | SPI_MODE_CSHIGH)
#endif

#endif /* SPI_MODE_AT45D0 */

#ifndef MOUNT_OFFSET_AT45D0
#define MOUNT_OFFSET_AT45D0         0
#endif

#ifndef MOUNT_TOP_RESERVE_AT45D0
#define MOUNT_TOP_RESERVE_AT45D0    0
#endif

/*!
 * \brief AT45D DataFlash SPI node implementation structure.
 */
NUTSPINODE nodeSpiAt45d0 = {
    NULL,                       /*!< \brief Pointer to the bus controller driver, node_bus. */
    NULL,                       /*!< \brief Pointer to device driver specific settings, node_stat. */
    SPI_RATE_AT45D0,            /*!< \brief Initial clock rate, node_rate. */
    SPI_MODE_AT45D0,            /*!< \brief Initial mode, node_mode. */
    8,                          /*!< \brief Initial data bits, node_bits. */
    0                           /*!< \brief Chip select, node_cs. */
};

/*!
 * \brief AT45D DataFlash block I/O implementation structure.
 */
static NUTBLOCKIO blkIoAt45d0 = {
    NULL,                       /*!< \brief Device specific parameters, blkio_info. */
    0,                          /*!< \brief Total number of pages, blkio_blk_cnt. */
    0,                          /*!< \brief Number of bytes per page, blkio_blk_siz. */
    MOUNT_OFFSET_AT45D0,        /*!< \brief Number of sectors reserved at bottom, blkio_vol_bot. */
    MOUNT_TOP_RESERVE_AT45D0,   /*!< \brief Number of sectors reserved at top, blkio_vol_top. */
    SpiAt45dPageRead,           /*!< \brief Read from node, blkio_read. */
    SpiAt45dPageWrite,          /*!< \brief Write to node, blkio_write. */
#ifdef __HARVARD_ARCH__
    SpiAt45dPageWrite_P,        /*!< \brief Write program memory to node, blkio_write_P. */
#endif
    SpiAt45dIOCtl               /*!< \brief Control functions, blkio_ioctl. */
};

/*!
 * \brief AT45D DataFlash device implementation structure.
 */
NUTDEVICE devSpiAt45d0 = {
    NULL,                       /*!< \brief Pointer to next device, dev_next. */
    {'A', 'T', '4', '5', 'D', '0', 0, 0, 0},    /*!< \brief Unique device name, dev_name. */
    IFTYP_BLKIO,                /*!< \brief Type of device, dev_type. */
    0,                          /*!< \brief Base address, dev_base (not used). */
    0,                          /*!< \brief First interrupt number, dev_irq (not used). */
    &nodeSpiAt45d0,             /*!< \brief Interface control block, dev_icb. */
    &blkIoAt45d0,               /*!< \brief Driver control block, dev_dcb. */
    SpiAt45dInit,               /*!< \brief Driver initialization routine, dev_init. */
    NutBlockDeviceIOCtl,        /*!< \brief Driver specific control function, dev_ioctl. */
    NutBlockDeviceRead,         /*!< \brief Read from device, dev_read. */
    NutBlockDeviceWrite,        /*!< \brief Write to device, dev_write. */
#ifdef __HARVARD_ARCH__
    NutBlockDeviceWrite_P,      /*!< \brief Write data from program space to device, dev_write_P. */
#endif
    NutBlockDeviceOpen,         /*!< \brief Mount volume, dev_open. */
    NutBlockDeviceClose,        /*!< \brief Unmount volume, dev_close. */
    NutBlockDeviceSize,         /*!< \brief Request file size, dev_size. */
    NULL,                       /*!< \brief Select function, optional, not yet implemented */
};