/****************************************************************************
*
* Driver for the IFX 6x60 spi modem.
*
* Copyright (C) 2008 Option International
* Copyright (C) 2008 Filip Aben <f.aben@option.com>
* Denis Joseph Barrow <d.barow@option.com>
* Jan Dumon <j.dumon@option.com>
*
* Copyright (C) 2009, 2010 Intel Corp
* Russ Gorby <russ.gorby@intel.com>
*
* 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.
*
* 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; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
* Driver modified by Intel from Option gtm501l_spi.c
*
* Notes
* o The driver currently assumes a single device only. If you need to
* change this then look for saved_ifx_dev and add a device lookup
* o The driver is intended to be big-endian safe but has never been
* tested that way (no suitable hardware). There are a couple of FIXME
* notes by areas that may need addressing
* o Some of the GPIO naming/setup assumptions may need revisiting if
* you need to use this driver for another platform.
*
*****************************************************************************/
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/termios.h>
#include <linux/tty.h>
#include <linux/device.h>
#include <linux/spi/spi.h>
#include <linux/kfifo.h>
#include <linux/tty_flip.h>
#include <linux/timer.h>
#include <linux/serial.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/rfkill.h>
#include <linux/fs.h>
#include <linux/ip.h>
#include <linux/dmapool.h>
#include <linux/gpio.h>
#include <linux/sched.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/spi/ifx_modem.h>
#include <linux/delay.h>
#include "ifx6x60.h"
#define IFX_SPI_MORE_MASK 0x10
#define IFX_SPI_MORE_BIT 12 /* bit position in u16 */
#define IFX_SPI_CTS_BIT 13 /* bit position in u16 */
#define IFX_SPI_MODE SPI_MODE_1
#define IFX_SPI_TTY_ID 0
#define IFX_SPI_TIMEOUT_SEC 2
#define IFX_SPI_HEADER_0 (-1)
#define IFX_SPI_HEADER_F (-2)
/* forward reference */
static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev);
/* local variables */
static int spi_bpw = 16; /* 8, 16 or 32 bit word length */
static struct tty_driver *tty_drv;
static struct ifx_spi_device *saved_ifx_dev;
static struct lock_class_key ifx_spi_key;
/* GPIO/GPE settings */
/**
* mrdy_set_high - set MRDY GPIO
* @ifx: device we are controlling
*
*/
static inline void mrdy_set_high(
