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/**
* @file
*
* @ingroup arm_beagle
*
* @brief SPI support API.
*
* Based on bsps/m68k/gen68360/spi/m360_spi.h
*/
/*
* Copyright (c) 2018 Pierre-Louis Garnier <garnie_a@epita.fr>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifndef LIBBSP_ARM_BEAGLE_SPI_H
#define LIBBSP_ARM_BEAGLE_SPI_H
#include <bsp.h>
#include <rtems/libi2c.h>
#include <rtems/irq.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#define BBB_SPI_TIMEOUT 1000
#define BBB_SPI_0_BUS_PATH "/dev/spi-0"
#define BBB_SPI_0_IRQ AM335X_INT_SPI0INT
typedef enum {
SPI0,
SPI1,
SPI_COUNT
} bbb_spi_id_t;
typedef struct BEAGLE_SPI_BufferDescriptor_ {
unsigned short status;
unsigned short length;
volatile void *buffer;
} BEAGLE_SPI_BufferDescriptor_t;
typedef struct beagle_spi_softc {
int initialized;
rtems_id task_id;
uintptr_t regs_base;
rtems_vector_number irq;
} beagle_spi_softc_t;
typedef struct {
rtems_libi2c_bus_t bus_desc;
beagle_spi_softc_t softc;
} beagle_spi_desc_t;
/*
* Initialize the driver
*
* Returns: o = ok or error code
*/
rtems_status_code beagle_spi_init
(
rtems_libi2c_bus_t *bh /* bus specifier structure */
);
/*
* Receive some bytes from SPI device
*
* Returns: number of bytes received or (negative) error code
*/
int beagle_spi_read_bytes
(
rtems_libi2c_bus_t *bh, /* bus specifier structure */
unsigned char *buf, /* buffer to store bytes */
int len /* number of bytes to receive */
);
/*
* Send some bytes to SPI device
*
* Returns: number of bytes sent or (negative) error code
*/
int beagle_spi_write_bytes
(
rtems_libi2c_bus_t *bh, /* bus specifier structure */
unsigned char *buf, /* buffer to send */
int len /* number of bytes to send */
);
/*
* Set SPI to desired baudrate/clock mode/character mode
*
* Returns: rtems_status_code
*/
rtems_status_code beagle_spi_set_tfr_mode
(
rtems_libi2c_bus_t *bh, /* bus specifier structure */
const rtems_libi2c_tfr_mode_t *tfr_mode /* transfer mode info */
);
/*
* Perform selected ioctl function for SPI
*
* Returns: rtems_status_code
*/
int beagle_spi_ioctl
(
rtems_libi2c_bus_t *bh, /* bus specifier structure */
int cmd, /* ioctl command code */
void *arg /* additional argument array */
);
/*
* Register SPI bus and devices
*
* Returns: Bus number or error code
*/
rtems_status_code bsp_register_spi
(
const char *bus_path,
uintptr_t register_base,
rtems_vector_number irq
);
static inline rtems_status_code bbb_register_spi_0(void)
{
return bsp_register_spi(
BBB_SPI_0_BUS_PATH,
AM335X_SPI0_BASE,
BBB_SPI_0_IRQ
);
}
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* LIBBSP_ARM_BEAGLE_SPI_H */
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