path: root/drivers/spi/spi_bfin5xx.c

/*
 * File:	drivers/spi/bfin5xx_spi.c
 * Maintainer:
 *		Bryan Wu <bryan.wu@analog.com>
 * Original Author:
 *		Luke Yang (Analog Devices Inc.)
 *
 * Created:	March. 10th 2006
 * Description:	SPI controller driver for Blackfin BF5xx
 * Bugs:	Enter bugs at http://blackfin.uclinux.org/
 *
 * Modified:
 *	March 10, 2006  bfin5xx_spi.c Created. (Luke Yang)
 *      August 7, 2006  added full duplex mode (Axel Weiss & Luke Yang)
 *      July  17, 2007  add support for BF54x SPI0 controller (Bryan Wu)
 *
 * Copyright 2004-2007 Analog Devices Inc.
 *
 * 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, 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 ;  see the file COPYING.
 * If not, write to the Free Software Foundation,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/spi/spi.h>
#include <linux/workqueue.h>

#include <asm/dma.h>
#include <asm/portmux.h>
#include <asm/bfin5xx_spi.h>

MODULE_AUTHOR("Bryan Wu, Luke Yang");
MODULE_DESCRIPTION("Blackfin BF5xx SPI Contoller Driver");
MODULE_LICENSE("GPL");

#define DRV_NAME	"bfin-spi-master"
#define IS_DMA_ALIGNED(x) (((u32)(x)&0x07)==0)

#define DEFINE_SPI_REG(reg, off) \
static inline u16 read_##reg(void) \
	{ return bfin_read16(SPI0_REGBASE + off); } \
static inline void write_##reg(u16 v) \
	{bfin_write16(SPI0_REGBASE + off, v); }

DEFINE_SPI_REG(CTRL, 0x00)
DEFINE_SPI_REG(FLAG, 0x04)
DEFINE_SPI_REG(STAT, 0x08)
DEFINE_SPI_REG(TDBR, 0x0C)
DEFINE_SPI_REG(RDBR, 0x10)
DEFINE_SPI_REG(BAUD, 0x14)
DEFINE_SPI_REG(SHAW, 0x18)
#define START_STATE ((void*)0)
#define RUNNING_STATE ((void*)1)
#define DONE_STATE ((void*)2)
#define ERROR_STATE ((void*)-1)
#define QUEUE_RUNNING 0
#define QUEUE_STOPPED 1
int dma_requested;

struct driver_data {
	/* Driver model hookup */
	struct platform_device *pdev;

	/* SPI framework hookup */
	struct spi_master *master;

	/* BFIN hookup */
	struct bfin5xx_spi_master *master_info;

	/* Driver message queue */
	struct workqueue_struct *workqueue;
	struct work_struct pump_messages;
	spinlock_t lock;
	struct list_head queue;
	int busy;
	int run;

	/* Message Transfer pump */
	struct tasklet_struct pump_transfers;

	/* Current message transfer state info */
	struct spi_message *cur_msg;
	struct spi_transfer *cur_transfer;
	struct chip_data *cur_chip;
	size_t len_in_bytes;