linux-imx

/*

 * A driver for the ARM PL022 PrimeCell SSP/SPI bus master.

 *

 * Copyright (C) 2008-2012 ST-Ericsson AB

 * Copyright (C) 2006 STMicroelectronics Pvt. Ltd.

 *

 * Author: Linus Walleij <linus.walleij@stericsson.com>

 *

 * Initial version inspired by:

 *  linux-2.6.17-rc3-mm1/drivers/spi/pxa2xx_spi.c

 * Initial adoption to PL022 by:

 *      Sachin Verma <sachin.verma@st.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 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.

 */

​

#include <linux/init.h>

#include <linux/module.h>

#include <linux/device.h>

#include <linux/ioport.h>

#include <linux/errno.h>

#include <linux/interrupt.h>

#include <linux/spi/spi.h>

#include <linux/delay.h>

#include <linux/clk.h>

#include <linux/err.h>

#include <linux/amba/bus.h>

#include <linux/amba/pl022.h>

#include <linux/io.h>

#include <linux/slab.h>

#include <linux/dmaengine.h>

#include <linux/dma-mapping.h>

#include <linux/scatterlist.h>

#include <linux/pm_runtime.h>

#include <linux/gpio.h>

#include <linux/of_gpio.h>

#include <linux/pinctrl/consumer.h>

​

/*

 * This macro is used to define some register default values.

 * reg is masked with mask, the OR:ed with an (again masked)

 * val shifted sb steps to the left.

 */

#define SSP_WRITE_BITS(reg, val, mask, sb) \

 ((reg) = (((reg) & ~(mask)) | (((val)<<(sb)) & (mask))))

​

/*

 * This macro is also used to define some default values.

 * It will just shift val by sb steps to the left and mask

 * the result with mask.

 */

#define GEN_MASK_BITS(val, mask, sb) \

 (((val)<<(sb)) & (mask))

​

#define DRIVE_TX        0