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/*
* Copyright (C) 2008 Embedded Alley Solutions Inc.
*
* (C) Copyright 2009 Freescale Semiconductor, Inc.
*
* SSP/SPI driver
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef SPI_H
#define SPI_H
#include <config.h>
#include <common.h>
#include <asm/arch/ssp.h>
/*
* Flags to set SPI mode
*/
#define SPI_PHASE 0x1 /* Set phase to 1 */
#define SPI_POLARITY 0x2 /* Set polarity to 1 */
/* Various flags to control SPI transfers */
#define SPI_START 0x1 /* Lock CS signal */
#define SPI_STOP 0x2 /* Unlock CS signal */
/*
* Init SSPx interface, must be called first
*/
void spi_init(void);
/*
* Set phase, polarity and CS number (SS0, SS1, SS2)
*/
void spi_set_cfg(unsigned int bus, unsigned int cs, unsigned long mode);
/*
* Send @rx_len bytes from @dout, then receive @rx_len bytes
* saving them to @din
*/
void spi_txrx(const char *dout, unsigned int tx_len, char *din,
unsigned int rx_len, unsigned long flags);
/* Lock/unlock SPI bus */
static inline void spi_lock(void)
{
disable_interrupts();
}
static inline void spi_unlock(void)
{
enable_interrupts();
}
#endif /* SPI_H */
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