disk: Add SD/MMC driver

Only SPI is supported.

Signed-off-by: Benoît Thébaudeau <benoit@wsystem.com>

dev/disk/mmc/mmc-arch.h

@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2016, Benoît Thébaudeau <benoit@wsystem.com>
+ * 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 holder nor the names of its 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 HOLDER 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.
+ */
+/**
+ * \addtogroup mmc
+ * @{
+ *
+ * \defgroup mmc-arch SD/MMC architecture-specific definitions
+ *
+ * SD/MMC device driver architecture-specific definitions.
+ * @{
+ *
+ * \file
+ * Header file for the SD/MMC device driver architecture-specific definitions.
+ */
+#ifndef MMC_ARCH_H_
+#define MMC_ARCH_H_
+
+#include <stddef.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+/** \brief Callback of the SD/MMC driver to call when the card-detection signal
+ * changes.
+ * \param dev Device
+ * \param cd Whether a card is detected
+ * \note Using this function is not mandatory. This only allows to detect a card
+ * replacement between two successive calls to the SD/MMC driver API.
+ */
+void mmc_arch_cd_changed_callback(uint8_t dev, bool cd);
+
+/** \brief Gets the state of the card-detection signal.
+ * \param dev Device
+ * \return Whether a card is detected
+ */
+bool mmc_arch_get_cd(uint8_t dev);
+
+/** \brief Gets the state of the write-protection signal.
+ * \param dev Device
+ * \return Whether the card is write-protected
+ */
+bool mmc_arch_get_wp(uint8_t dev);
+
+/** \brief Sets the SPI /CS signal as indicated.
+ * \param dev Device
+ * \param sel Whether to assert /CS
+ */
+void mmc_arch_spi_select(uint8_t dev, bool sel);
+
+/** \brief Sets the SPI clock frequency.
+ * \param dev Device
+ * \param freq Frequency (Hz)
+ */
+void mmc_arch_spi_set_clock_freq(uint8_t dev, uint32_t freq);
+
+/** \brief Performs an SPI transfer.
+ * \param dev Device
+ * \param tx_buf Pointer to the transmission buffer, or \c NULL
+ * \param tx_cnt Number of bytes to transmit, or \c 0
+ * \param rx_buf Pointer to the reception buffer, or \c NULL
+ * \param rx_cnt Number of bytes to receive, or \c 0
+ */
+void mmc_arch_spi_xfer(uint8_t dev, const void *tx_buf, size_t tx_cnt,
+                       void *rx_buf, size_t rx_cnt);
+
+#endif /* MMC_ARCH_H_ */
+
+/**
+ * @}
+ * @}
+ */