drivers/spi/spi-omap-uwire.c



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/*
 * MicroWire interface driver for OMAP
 *
 * Copyright 2003 MontaVista Software Inc. <source@mvista.com>
 *
 * Ported to 2.6 OMAP uwire interface.
 * Copyright (C) 2004 Texas Instruments.
 *
 * Generalization patches by Juha Yrjola <juha.yrjola@nokia.com>
 *
 * Copyright (C) 2005 David Brownell (ported to 2.6 SPI interface)
 * Copyright (C) 2006 Nokia
 *
 * Many updates by Imre Deak <imre.deak@nokia.com>
 *
 * 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 SOFTWARE IS PROVIDED "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 AUTHOR 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.
 *
 * 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.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/slab.h>

#include <linux/spi/spi.h>
#include <linux/spi/spi_bitbang.h>

#include <asm/system.h>
#include <asm/irq.h>
#include <mach/hardware.h>
#include <asm/io.h>
#include <asm/mach-types.h>

#include <plat/mux.h>
#include <plat/omap7xx.h>	/* OMAP7XX_IO_CONF registers */


/* FIXME address is now a platform device resource,
 * and irqs should show there too...
 */
#define UWIRE_BASE_PHYS		0xFFFB3000

/* uWire Registers: */
#define UWIRE_IO_SIZE 0x20
#define UWIRE_TDR     0x00
#define UWIRE_RDR     0x00
#define UWIRE_CSR     0x01
#define UWIRE_SR1     0x02
#define UWIRE_SR2     0x03
#define UWIRE_SR3     0x04
#define UWIRE_SR4     0x05
#define UWIRE_SR5     0x06

/* CSR bits */
#define	RDRB	(1 << 15)
#define	CSRB	(1 << 14)
#define	START	(1 << 13)
#define	CS_CMD	(1 << 12)

/* SR1 or SR2 bits */
#define UWIRE_READ_FALLING_EDGE		0x0001
#define UWIRE_READ_RISING_EDGE		0x0000
#define UWIRE_WRITE_FALLING_EDGE	0x0000
#define UWIRE_WRITE_RISING_EDGE		0x0002
#define UWIRE_CS_ACTIVE_LOW		0x0000
#define UWIRE_CS_ACTIVE_HIGH		0x0004
#define UWIRE_FREQ_DIV_2		0x0000
#define UWIRE_FREQ_DIV_4		0x0008
#define UWIRE_FREQ_DIV_8		0x0010
#define UWIRE_CHK_READY			0x0020
#define UWIRE_CLK_INVERTED		0x0040


struct uwire_spi {