linux-imx

/*

 * MPC52xx SPI bus driver.

 *

 * Copyright (C) 2008 Secret Lab Technologies Ltd.

 *

 * This file is released under the GPLv2

 *

 * This is the driver for the MPC5200's dedicated SPI controller.

 *

 * Note: this driver does not support the MPC5200 PSC in SPI mode.  For

 * that driver see drivers/spi/mpc52xx_psc_spi.c

 */

​

#include <linux/module.h>

#include <linux/errno.h>

#include <linux/of_platform.h>

#include <linux/interrupt.h>

#include <linux/delay.h>

#include <linux/spi/spi.h>

#include <linux/io.h>

#include <linux/of_gpio.h>

#include <linux/slab.h>

#include <asm/time.h>

#include <asm/mpc52xx.h>

​

MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");

MODULE_DESCRIPTION("MPC52xx SPI (non-PSC) Driver");

MODULE_LICENSE("GPL");

​

/* Register offsets */

#define SPI_CTRL1   0x00

#define SPI_CTRL1_SPIE      (1 << 7)

#define SPI_CTRL1_SPE       (1 << 6)

#define SPI_CTRL1_MSTR      (1 << 4)

#define SPI_CTRL1_CPOL      (1 << 3)

#define SPI_CTRL1_CPHA      (1 << 2)

#define SPI_CTRL1_SSOE      (1 << 1)

#define SPI_CTRL1_LSBFE     (1 << 0)

​

#define SPI_CTRL2   0x01

#define SPI_BRR     0x04

​

#define SPI_STATUS  0x05

#define SPI_STATUS_SPIF     (1 << 7)

#define SPI_STATUS_WCOL     (1 << 6)

#define SPI_STATUS_MODF     (1 << 4)

​

#define SPI_DATA    0x09

#define SPI_PORTDATA    0x0d

#define SPI_DATADIR 0x10

​

/* FSM state return values */

#define FSM_STOP    0   /* Nothing more for the state machine to */

                /* do.  If something interesting happens */

                /* then an IRQ will be received */

#define FSM_POLL    1   /* need to poll for completion, an IRQ is */

                /* not expected */

#define FSM_CONTINUE    2   /* Keep iterating the state machine */

​

/* Driver internal data */

struct mpc52xx_spi {

    struct spi_master *master;

    void __iomem *regs;