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remarkable-linux/drivers/serial/max3107-aava.c
Alan Cox 61fd15262b serial: max3107: Abstract out the platform specific bits 
At the moment there is only one platform type supported and there is is
hard wired, but with these changes the infrastructure is now there for
anyone else to provide methods for their hardware.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-10 13:47:44 -07:00

345 lines
9.1 KiB
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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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