linux-imx

/*

 * Altera SPI driver

 *

 * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>

 *

 * Based on spi_s3c24xx.c, which is:

 * Copyright (c) 2006 Ben Dooks

 * Copyright (c) 2006 Simtec Electronics

 *  Ben Dooks <ben@simtec.co.uk>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

​

#include <linux/interrupt.h>

#include <linux/errno.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/spi/spi.h>

#include <linux/io.h>

#include <linux/of.h>

​

#define DRV_NAME "spi_altera"

​

#define ALTERA_SPI_RXDATA   0

#define ALTERA_SPI_TXDATA   4

#define ALTERA_SPI_STATUS   8

#define ALTERA_SPI_CONTROL  12

#define ALTERA_SPI_SLAVE_SEL    20

​

#define ALTERA_SPI_STATUS_ROE_MSK   0x8

#define ALTERA_SPI_STATUS_TOE_MSK   0x10

#define ALTERA_SPI_STATUS_TMT_MSK   0x20

#define ALTERA_SPI_STATUS_TRDY_MSK  0x40

#define ALTERA_SPI_STATUS_RRDY_MSK  0x80

#define ALTERA_SPI_STATUS_E_MSK     0x100

​

#define ALTERA_SPI_CONTROL_IROE_MSK 0x8

#define ALTERA_SPI_CONTROL_ITOE_MSK 0x10

#define ALTERA_SPI_CONTROL_ITRDY_MSK    0x40

#define ALTERA_SPI_CONTROL_IRRDY_MSK    0x80

#define ALTERA_SPI_CONTROL_IE_MSK   0x100

#define ALTERA_SPI_CONTROL_SSO_MSK  0x400

​

struct altera_spi {

    void __iomem *base;

    int irq;

    int len;

    int count;

    int bytes_per_word;

    unsigned long imr;

​

    /* data buffers */

    const unsigned char *tx;

    unsigned char *rx;

};

​

static inline struct altera_spi *altera_spi_to_hw(struct spi_device *sdev)

{

    return spi_master_get_devdata(sdev->master);

}

​