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nuttx/arch/arm/src/sama5/sam_spi.h

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/****************************************************************************
* arch/arm/src/sama5/sam_spi.h
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 NuttX 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 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.
*
****************************************************************************/
#ifndef __ARCH_ARM_SRC_SAMA5_SAM_SPI_H
#define __ARCH_ARM_SRC_SAMA5_SAM_SPI_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include "chip.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* The SPI port number used as an input to sam_spibus_initialize encodes information
* about the SPI controller (0 or 1) and the SPI chip select (0-3)
*/
#define __SPI_CS_SHIFT (0) /* Bits 0-1: SPI chip select number */
#define __SPI_CS_MASK (3 << __SPI_CS_SHIFT)
# define __SPI_CS0 (0 << __SPI_CS_SHIFT)
# define __SPI_CS1 (1 << __SPI_CS_SHIFT)
# define __SPI_CS2 (2 << __SPI_CS_SHIFT)
# define __SPI_CS3 (3 << __SPI_CS_SHIFT)
#define __SPI_SPI_SHIFT (2) /* Bit 2: SPI controller number */
#define __SPI_SPI_MASK (1 << __SPI_SPI_SHIFT)
# define __SPI_SPI0 (0 << __SPI_SPI_SHIFT) /* SPI0 */
# define __SPI_SPI1 (1 << __SPI_SPI_SHIFT) /* SPI1 */
#define SPI0_CS0 (__SPI_SPI0 | __SPI_CS0)
#define SPI0_CS1 (__SPI_SPI0 | __SPI_CS1)
#define SPI0_CS2 (__SPI_SPI0 | __SPI_CS2)
#define SPI0_CS3 (__SPI_SPI0 | __SPI_CS3)
#define SPI1_CS0 (__SPI_SPI1 | __SPI_CS0)
#define SPI1_CS1 (__SPI_SPI1 | __SPI_CS1)
#define SPI1_CS2 (__SPI_SPI1 | __SPI_CS2)
#define SPI1_CS3 (__SPI_SPI1 | __SPI_CS3)
/****************************************************************************
* Public Types
****************************************************************************/
/****************************************************************************
* Inline Functions
****************************************************************************/
#ifndef __ASSEMBLY__
/****************************************************************************
* Public Data
****************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
struct spi_dev_s; /* Forward reference */
enum spi_dev_e; /* Forward reference */
/****************************************************************************
* Name: sam_spibus_initialize
*
* Description:
* Initialize the selected SPI port
*
* Input Parameter:
* cs - Chip select number (identifying the "logical" SPI port)
*
* Returned Value:
* Valid SPI device structure reference on succcess; a NULL on failure
*
****************************************************************************/
struct spi_dev_s *sam_spibus_initialize(int port);
/****************************************************************************
* Name: sam_spi[0|1]select, sam_spi[0|1]status, and sam_spi[0|1]cmddata
*
* Description:
* These external functions must be provided by board-specific logic. They
* include:
*
* o sam_spi[0|1]select is a functions tomanage the board-specific chip selects
* o sam_spi[0|1]status and sam_spi[0|1]cmddata: Implementations of the status
* and cmddata methods of the SPI interface defined by struct spi_ops_
* (see include/nuttx/spi/spi.h). All other methods including
* sam_spibus_initialize()) are provided by common SAM3/4 logic.
*
* To use this common SPI logic on your board:
*
* 1. Provide logic in sam_boardinitialize() to configure SPI chip select
* pins.
* 2. Provide sam_spi[0|1]select() and sam_spi[0|1]status() functions in your board-
* specific logic. These functions will perform chip selection and
* status operations using PIOs in the way your board is configured.
* 2. If CONFIG_SPI_CMDDATA is defined in the NuttX configuration, provide
* sam_spi[0|1]cmddata() functions in your board-specific logic. This
* function will perform cmd/data selection operations using PIOs in
* the way your board is configured.
* 3. Add a call to sam_spibus_initialize() in your low level application
* initialization logic
* 4. The handle returned by sam_spibus_initialize() may then be used to bind the
* SPI driver to higher level logic (e.g., calling
* mmcsd_spislotinitialize(), for example, will bind the SPI driver to
* the SPI MMC/SD driver).
*
****************************************************************************/
/****************************************************************************
* Name: sam_spi[0|1]select
*
* Description:
* PIO chip select pins may be programmed by the board specific logic in
* one of two different ways. First, the pins may be programmed as SPI
* peripherals. In that case, the pins are completely controlled by the
* SPI driver. This method still needs to be provided, but it may be only
* a stub.
*
* An alternative way to program the PIO chip select pins is as a normal
* PIO output. In that case, the automatic control of the CS pins is
* bypassed and this function must provide control of the chip select.
* NOTE: In this case, the PIO output pin does *not* have to be the
* same as the NPCS pin normal associated with the chip select number.
*
* Input Parameters:
* dev - SPI device info
* devid - Identifies the (logical) device
* selected - TRUE:Select the device, FALSE:De-select the device
*
* Returned Values:
* None
*
****************************************************************************/
#ifdef CONFIG_SAMA5_SPI0
void sam_spi0select(enum spi_dev_e devid, bool selected);
#endif
#ifdef CONFIG_SAMA5_SPI1
void sam_spi1select(enum spi_dev_e devid, bool selected);
#endif
/****************************************************************************
* Name: sam_spi[0|1]status
*
* Description:
* Return status information associated with the SPI device.
*
* Input Parameters:
* dev - SPI device info
* devid - Identifies the (logical) device
*
* Returned Values:
* Bit-encoded SPI status (see include/nuttx/spi/spi.h.
*
****************************************************************************/
#ifdef CONFIG_SAMA5_SPI0
uint8_t sam_spi0status(FAR struct spi_dev_s *dev, enum spi_dev_e devid);
#endif
#ifdef CONFIG_SAMA5_SPI1
uint8_t sam_spi1status(FAR struct spi_dev_s *dev, enum spi_dev_e devid);
#endif
/****************************************************************************
* Name: sam_spi[0|1]cmddata
*
* Description:
* Some SPI devices require an additional control to determine if the SPI
* data being sent is a command or is data. If CONFIG_SPI_CMDDATA then
* this function will be called to different be command and data transfers.
*
* This is often needed, for example, by LCD drivers. Some LCD hardware
* may be configured to use 9-bit data transfers with the 9th bit
* indicating command or data. That same hardware may be configurable,
* instead, to use 8-bit data but to require an additional, board-
* specific PIO control to distinguish command and data. This function
* would be needed in that latter case.
*
* Input Parameters:
* dev - SPI device info
* devid - Identifies the (logical) device
*
* Returned Values:
* Zero on success; a negated errno on failure.
*
****************************************************************************/
#ifdef CONFIG_SPI_CMDDATA
#ifdef CONFIG_SAMA5_SPI0
int sam_spi0cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd);
#endif
#ifdef CONFIG_SAMA5_SPI1
int sam_spi1cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd);
#endif
#endif
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __ASSEMBLY__ */
#endif /* __ARCH_ARM_SRC_SAMA5_SAM_SPI_H */
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