326 lines
12 KiB
C
326 lines
12 KiB
C
/****************************************************************************
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* arch/arm/src/samv7/sam_spi.h
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*
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* Copyright (C) 2015-2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __ARCH_ARM_SRC_SAMV7_SAM_SPI_H
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#define __ARCH_ARM_SRC_SAMV7_SAM_SPI_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "chip.h"
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#include "sam_config.h"
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#ifdef CONFIG_SAMV7_SPI
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* The SPI port number used as an input to sam_spibus_initialize encodes
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* information about the SPI controller (0 or 1) and the SPI chip select
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* (0-3).
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*
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* NOTE that this is this is backward compatible with older implementations
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* that support only SPI0 and provide only the chip select number to
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* sam_spibus_initialize().
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*/
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#ifdef CONFIG_SAMV7_SPI_CS_DECODING
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# define __SPI_CS_SHIFT (0) /* Bits 0-3: SPI chip select number */
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# define __SPI_CS_MASK (15 << __SPI_CS_SHIFT)
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# define __SPI_SPI_SHIFT (4) /* Bit 4: SPI controller number */
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# define __SPI_SPI_MASK (1 << __SPI_SPI_SHIFT)
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# define __SPI_SPI0 (0 << __SPI_SPI_SHIFT) /* SPI0 */
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# define __SPI_SPI1 (1 << __SPI_SPI_SHIFT) /* SPI1 */
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# define SPI0_CS1 (__SPI_SPI0 | 1)
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# define SPI0_CS2 (__SPI_SPI0 | 2)
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# define SPI0_CS3 (__SPI_SPI0 | 3)
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# define SPI0_CS4 (__SPI_SPI0 | 4)
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# define SPI0_CS5 (__SPI_SPI0 | 5)
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# define SPI0_CS6 (__SPI_SPI0 | 6)
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# define SPI0_CS7 (__SPI_SPI0 | 7)
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# define SPI0_CS8 (__SPI_SPI0 | 8)
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# define SPI0_CS9 (__SPI_SPI0 | 9)
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# define SPI0_CS10 (__SPI_SPI0 | 10)
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# define SPI0_CS11 (__SPI_SPI0 | 11)
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# define SPI0_CS12 (__SPI_SPI0 | 12)
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# define SPI0_CS13 (__SPI_SPI0 | 13)
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# define SPI0_CS14 (__SPI_SPI0 | 14)
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# define SPI0_CS15 (__SPI_SPI0 | 15)
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# define SPI1_CS1 (__SPI_SPI1 | 1)
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# define SPI1_CS2 (__SPI_SPI1 | 2)
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# define SPI1_CS3 (__SPI_SPI1 | 3)
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# define SPI1_CS4 (__SPI_SPI1 | 4)
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# define SPI1_CS5 (__SPI_SPI1 | 5)
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# define SPI1_CS6 (__SPI_SPI1 | 6)
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# define SPI1_CS7 (__SPI_SPI1 | 7)
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# define SPI1_CS8 (__SPI_SPI1 | 8)
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# define SPI1_CS9 (__SPI_SPI1 | 9)
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# define SPI1_CS10 (__SPI_SPI1 | 10)
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# define SPI1_CS11 (__SPI_SPI1 | 11)
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# define SPI1_CS12 (__SPI_SPI1 | 12)
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# define SPI1_CS13 (__SPI_SPI1 | 13)
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# define SPI1_CS14 (__SPI_SPI1 | 14)
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# define SPI1_CS15 (__SPI_SPI1 | 15)
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#else /* CONFIG_SAMV7_SPI_CS_DECODING */
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# define __SPI_CS_SHIFT (0) /* Bits 0-1: SPI chip select number */
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# define __SPI_CS_MASK (3 << __SPI_CS_SHIFT)
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# define __SPI_CS0 (0 << __SPI_CS_SHIFT)
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# define __SPI_CS1 (1 << __SPI_CS_SHIFT)
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# define __SPI_CS2 (2 << __SPI_CS_SHIFT)
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# define __SPI_CS3 (3 << __SPI_CS_SHIFT)
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# define __SPI_SPI_SHIFT (2) /* Bit 2: SPI controller number */
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# define __SPI_SPI_MASK (1 << __SPI_SPI_SHIFT)
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# define __SPI_SPI0 (0 << __SPI_SPI_SHIFT) /* SPI0 */
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# define __SPI_SPI1 (1 << __SPI_SPI_SHIFT) /* SPI1 */
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# define SPI0_CS0 (__SPI_SPI0 | __SPI_CS0)
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# define SPI0_CS1 (__SPI_SPI0 | __SPI_CS1)
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# define SPI0_CS2 (__SPI_SPI0 | __SPI_CS2)
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# define SPI0_CS3 (__SPI_SPI0 | __SPI_CS3)
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# define SPI1_CS0 (__SPI_SPI1 | __SPI_CS0)
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# define SPI1_CS1 (__SPI_SPI1 | __SPI_CS1)
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# define SPI1_CS2 (__SPI_SPI1 | __SPI_CS2)
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# define SPI1_CS3 (__SPI_SPI1 | __SPI_CS3)
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#endif /* CONFIG_SAMV7_SPI_CS_DECODING */
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Inline Functions
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****************************************************************************/
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#ifndef __ASSEMBLY__
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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struct spi_dev_s; /* Forward reference */
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struct spi_sctrlr_s; /* Forward reference */
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/****************************************************************************
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* Name: sam_spibus_initialize
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*
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* Description:
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* Initialize the selected SPI port in master mode
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*
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* Input Parameters:
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* cs - Chip select number (identifying the "logical" SPI port)
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*
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* Returned Value:
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* Valid SPI device structure reference on success; a NULL on failure
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*
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****************************************************************************/
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FAR struct spi_dev_s *sam_spibus_initialize(int port);
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/****************************************************************************
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* Name: sam_spi_slave_initialize
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*
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* Description:
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* Initialize the selected SPI port in slave mode.
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*
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* Input Parameters:
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* port - Chip select number identifying the "logical" SPI port. Includes
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* encoded port and chip select information.
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*
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* Returned Value:
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* Valid SPI device structure reference on success; a NULL on failure
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*
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****************************************************************************/
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FAR struct spi_sctrlr_s *sam_spi_slave_initialize(int port);
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/****************************************************************************
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* Name: sam_spi[0|1]select, sam_spi[0|1]status, and sam_spi[0|1]cmddata
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*
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* Description:
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* These external functions must be provided by board-specific logic.
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* They include:
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*
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* o sam_spi[0|1]select is a functions to manage the board-specific chip
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* selects
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* o sam_spi[0|1]status and sam_spi[0|1]cmddata: Implementations of the
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* status and cmddata methods of the SPI interface defined by struct
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* spi_ops_ (see include/nuttx/spi/spi.h). All other methods including
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* sam_spibus_initialize()) are provided by common SAM3/4 logic.
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*
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* To use this common SPI logic on your board:
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*
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* 1. Provide logic in sam_boardinitialize() to configure SPI chip select
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* pins.
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* 2. Provide sam_spi[0|1]select() and sam_spi[0|1]status() functions in
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* our board-specific logic. These functions will perform chip selection
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* and status operations using PIOs in the way your board is configured.
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* 2. If CONFIG_SPI_CMDDATA is defined in the NuttX configuration, provide
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* sam_spi[0|1]cmddata() functions in your board-specific logic. This
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* function will perform cmd/data selection operations using PIOs in
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* the way your board is configured.
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* 3. Add a call to sam_spibus_initialize() in your low level application
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* initialization logic
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* 4. The handle returned by sam_spibus_initialize() may then be used to bind the
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* SPI driver to higher level logic (e.g., calling
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* mmcsd_spislotinitialize(), for example, will bind the SPI driver to
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* the SPI MMC/SD driver).
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*
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****************************************************************************/
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/****************************************************************************
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* Name: sam_spi[0|1]select
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*
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* Description:
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* PIO chip select pins may be programmed by the board specific logic in
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* one of two different ways. First, the pins may be programmed as SPI
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* peripherals. In that case, the pins are completely controlled by the
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* SPI driver. This method still needs to be provided, but it may be only
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* a stub.
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*
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* An alternative way to program the PIO chip select pins is as a normal
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* PIO output. In that case, the automatic control of the CS pins is
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* bypassed and this function must provide control of the chip select.
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* NOTE: In this case, the PIO output pin does *not* have to be the
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* same as the NPCS pin normal associated with the chip select number.
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*
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* Input Parameters:
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* dev - SPI device info
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* devid - Identifies the (logical) device
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* selected - TRUE:Select the device, FALSE:De-select the device
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#ifdef CONFIG_SAMV7_SPI0_MASTER
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void sam_spi0select(uint32_t devid, bool selected);
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#endif
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#ifdef CONFIG_SAMV7_SPI1_MASTER
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void sam_spi1select(uint32_t devid, bool selected);
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#endif
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/****************************************************************************
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* Name: sam_spi[0|1]status
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*
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* Description:
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* Return status information associated with the SPI device.
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*
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* Input Parameters:
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* dev - SPI device info
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* devid - Identifies the (logical) device
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*
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* Returned Value:
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* Bit-encoded SPI status (see include/nuttx/spi/spi.h.
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*
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****************************************************************************/
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#ifdef CONFIG_SAMV7_SPI0
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uint8_t sam_spi0status(FAR struct spi_dev_s *dev, uint32_t devid);
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#endif
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#ifdef CONFIG_SAMV7_SPI1
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uint8_t sam_spi1status(FAR struct spi_dev_s *dev, uint32_t devid);
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#endif
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/****************************************************************************
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* Name: sam_spi[0|1]cmddata
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*
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* Description:
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* Some SPI devices require an additional control to determine if the SPI
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* data being sent is a command or is data. If CONFIG_SPI_CMDDATA then
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* this function will be called to different be command and data transfers.
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*
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* This is often needed, for example, by LCD drivers. Some LCD hardware
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* may be configured to use 9-bit data transfers with the 9th bit
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* indicating command or data. That same hardware may be configurable,
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* instead, to use 8-bit data but to require an additional, board-
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* specific PIO control to distinguish command and data. This function
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* would be needed in that latter case.
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*
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* Input Parameters:
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* dev - SPI device info
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* devid - Identifies the (logical) device
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*
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* Returned Value:
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* Zero on success; a negated errno on failure.
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*
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****************************************************************************/
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#ifdef CONFIG_SPI_CMDDATA
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#ifdef CONFIG_SAMV7_SPI0_MASTER
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int sam_spi0cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd);
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#endif
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#ifdef CONFIG_SAMV7_SPI1_MASTER
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int sam_spi1cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd);
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#endif
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#endif /* CONFIG_SPI_CMDDATA */
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_SAMV7_SPI */
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#endif /* __ARCH_ARM_SRC_SAMV7_SAM_SPI_H */
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