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linux-sg2042/drivers/serial/max3107-aava.c

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/*
* max3107.c - spi uart protocol driver for Maxim 3107
* Based on max3100.c
* by Christian Pellegrin <chripell@evolware.org>
* and max3110.c
* by Feng Tang <feng.tang@intel.com>
*
* Copyright (C) Aavamobile 2009
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/spi/spi.h>
#include <linux/freezer.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/sfi.h>
#include <asm/mrst.h>
#include "max3107.h"
/* GPIO direction to input function */
static int max3107_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
{
struct max3107_port *s = container_of(chip, struct max3107_port, chip);
u16 buf[1]; /* Buffer for SPI transfer */
if (offset >= MAX3107_GPIO_COUNT) {
dev_err(&s->spi->dev, "Invalid GPIO\n");
return -EINVAL;
}
/* Read current GPIO configuration register */
buf[0] = MAX3107_GPIOCFG_REG;
/* Perform SPI transfer */
if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {
dev_err(&s->spi->dev, "SPI transfer GPIO read failed\n");
return -EIO;
}
buf[0] &= MAX3107_SPI_RX_DATA_MASK;
/* Set GPIO to input */
buf[0] &= ~(0x0001 << offset);
/* Write new GPIO configuration register value */
buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG);
/* Perform SPI transfer */
if (max3107_rw(s, (u8 *)buf, NULL, 2)) {
dev_err(&s->spi->dev, "SPI transfer GPIO write failed\n");
return -EIO;
}
return 0;
}
/* GPIO direction to output function */
static int max3107_gpio_direction_out(struct gpio_chip *chip, unsigned offset,
int value)
{
struct max3107_port *s = container_of(chip, struct max3107_port, chip);
u16 buf[2]; /* Buffer for SPI transfers */
if (offset >= MAX3107_GPIO_COUNT) {
dev_err(&s->spi->dev, "Invalid GPIO\n");
return -EINVAL;
}
/* Read current GPIO configuration and data registers */
buf[0] = MAX3107_GPIOCFG_REG;
buf[1] = MAX3107_GPIODATA_REG;
/* Perform SPI transfer */
if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) {
dev_err(&s->spi->dev, "SPI transfer gpio failed\n");
return -EIO;
}
buf[0] &= MAX3107_SPI_RX_DATA_MASK;
buf[1] &= MAX3107_SPI_RX_DATA_MASK;
/* Set GPIO to output */
buf[0] |= (0x0001 << offset);
/* Set value */
if (value)
buf[1] |= (0x0001 << offset);
else
buf[1] &= ~(0x0001 << offset);
/* Write new GPIO configuration and data register values */
buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG);
buf[1] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG);
/* Perform SPI transfer */
if (max3107_rw(s, (u8 *)buf, NULL, 4)) {
dev_err(&s->spi->dev,
"SPI transfer for GPIO conf data w failed\n");
return -EIO;
}
return 0;
}
/* GPIO value query function */
static int max3107_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct max3107_port *s = container_of(chip, struct max3107_port, chip);
u16 buf[1]; /* Buffer for SPI transfer */
if (offset >= MAX3107_GPIO_COUNT) {
dev_err(&s->spi->dev, "Invalid GPIO\n");
return -EINVAL;
}
/* Read current GPIO data register */
buf[0] = MAX3107_GPIODATA_REG;
/* Perform SPI transfer */
if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {
dev_err(&s->spi->dev, "SPI transfer GPIO data r failed\n");
return -EIO;
}
buf[0] &= MAX3107_SPI_RX_DATA_MASK;
/* Return value */
return buf[0] & (0x0001 << offset);
}
/* GPIO value set function */
static void max3107_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct max3107_port *s = container_of(chip, struct max3107_port, chip);
u16 buf[2]; /* Buffer for SPI transfers */
if (offset >= MAX3107_GPIO_COUNT) {
dev_err(&s->spi->dev, "Invalid GPIO\n");
return;
}
/* Read current GPIO configuration registers*/
buf[0] = MAX3107_GPIODATA_REG;
buf[1] = MAX3107_GPIOCFG_REG;
/* Perform SPI transfer */
if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) {
dev_err(&s->spi->dev,
"SPI transfer for GPIO data and config read failed\n");
return;
}
buf[0] &= MAX3107_SPI_RX_DATA_MASK;
buf[1] &= MAX3107_SPI_RX_DATA_MASK;
if (!(buf[1] & (0x0001 << offset))) {
/* Configured as input, can't set value */
dev_warn(&s->spi->dev,
"Trying to set value for input GPIO\n");
return;
}
/* Set value */
if (value)
buf[0] |= (0x0001 << offset);
else
buf[0] &= ~(0x0001 << offset);
/* Write new GPIO data register value */
buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG);
/* Perform SPI transfer */
if (max3107_rw(s, (u8 *)buf, NULL, 2))
dev_err(&s->spi->dev, "SPI transfer GPIO data w failed\n");
}
/* GPIO chip data */
static struct gpio_chip max3107_gpio_chip = {
.owner = THIS_MODULE,
.direction_input = max3107_gpio_direction_in,
.direction_output = max3107_gpio_direction_out,
.get = max3107_gpio_get,
.set = max3107_gpio_set,
.can_sleep = 1,
.base = MAX3107_GPIO_BASE,
.ngpio = MAX3107_GPIO_COUNT,
};
/**
* max3107_aava_reset - reset on AAVA systems
* @spi: The SPI device we are probing
*
* Reset the device ready for probing.
*/
static int max3107_aava_reset(struct spi_device *spi)
{
/* Reset the chip */
if (gpio_request(MAX3107_RESET_GPIO, "max3107")) {
pr_err("Requesting RESET GPIO failed\n");
return -EIO;
}
if (gpio_direction_output(MAX3107_RESET_GPIO, 0)) {
pr_err("Setting RESET GPIO to 0 failed\n");
gpio_free(MAX3107_RESET_GPIO);
return -EIO;
}
msleep(MAX3107_RESET_DELAY);
if (gpio_direction_output(MAX3107_RESET_GPIO, 1)) {
pr_err("Setting RESET GPIO to 1 failed\n");
gpio_free(MAX3107_RESET_GPIO);
return -EIO;
}
gpio_free(MAX3107_RESET_GPIO);
msleep(MAX3107_WAKEUP_DELAY);
return 0;
}
static int max3107_aava_configure(struct max3107_port *s)
{
int retval;
/* Initialize GPIO chip data */
s->chip = max3107_gpio_chip;
s->chip.label = s->spi->modalias;
s->chip.dev = &s->spi->dev;
/* Add GPIO chip */
retval = gpiochip_add(&s->chip);
if (retval) {
dev_err(&s->spi->dev, "Adding GPIO chip failed\n");
return retval;
}
/* Temporary fix for EV2 boot problems, set modem reset to 0 */
max3107_gpio_direction_out(&s->chip, 3, 0);
return 0;
}
#if 0
/* This will get enabled once we have the board stuff merged for this
specific case */
static const struct baud_table brg13_ext[] = {
{ 300, MAX3107_BRG13_B300 },
{ 600, MAX3107_BRG13_B600 },
{ 1200, MAX3107_BRG13_B1200 },
{ 2400, MAX3107_BRG13_B2400 },
{ 4800, MAX3107_BRG13_B4800 },
{ 9600, MAX3107_BRG13_B9600 },
{ 19200, MAX3107_BRG13_B19200 },
{ 57600, MAX3107_BRG13_B57600 },
{ 115200, MAX3107_BRG13_B115200 },
{ 230400, MAX3107_BRG13_B230400 },
{ 460800, MAX3107_BRG13_B460800 },
{ 921600, MAX3107_BRG13_B921600 },
{ 0, 0 }
};
static void max3107_aava_init(struct max3107_port *s)
{
/*override for AAVA SC specific*/
if (mrst_platform_id() == MRST_PLATFORM_AAVA_SC) {
if (get_koski_build_id() <= KOSKI_EV2)
if (s->ext_clk) {
s->brg_cfg = MAX3107_BRG13_B9600;
s->baud_tbl = (struct baud_table *)brg13_ext;
}
}
}
#endif
static int __devexit max3107_aava_remove(struct spi_device *spi)
{
struct max3107_port *s = dev_get_drvdata(&spi->dev);
/* Remove GPIO chip */
if (gpiochip_remove(&s->chip))
dev_warn(&spi->dev, "Removing GPIO chip failed\n");
/* Then do the default remove */
return max3107_remove(spi);
}
/* Platform data */
static struct max3107_plat aava_plat_data = {
.loopback = 0,
.ext_clk = 1,
/* .init = max3107_aava_init, */
.configure = max3107_aava_configure,
.hw_suspend = max3107_hw_susp,
.polled_mode = 0,
.poll_time = 0,
};
static int __devinit max3107_probe_aava(struct spi_device *spi)
{
int err = max3107_aava_reset(spi);
if (err < 0)
return err;
return max3107_probe(spi, &aava_plat_data);
}
/* Spi driver data */
static struct spi_driver max3107_driver = {
.driver = {
.name = "aava-max3107",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = max3107_probe_aava,
.remove = __devexit_p(max3107_aava_remove),
.suspend = max3107_suspend,
.resume = max3107_resume,
};
/* Driver init function */
static int __init max3107_init(void)
{
return spi_register_driver(&max3107_driver);
}
/* Driver exit function */
static void __exit max3107_exit(void)
{
spi_unregister_driver(&max3107_driver);
}
module_init(max3107_init);
module_exit(max3107_exit);
MODULE_DESCRIPTION("MAX3107 driver");
MODULE_AUTHOR("Aavamobile");
MODULE_ALIAS("aava-max3107-spi");
MODULE_LICENSE("GPL v2");
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