mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-05 02:57:09 +02:00
a0438292e5
This also fixes the watchdog logic and abstracts the access to the RDC321x southbridge PCI configuration register space. Based on a patch by Bernhard Loos. git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19972 3c298f89-4303-0410-b956-a3cf2f4a3e73
175 lines
4.6 KiB
C
175 lines
4.6 KiB
C
/*
|
|
* RDC321x GPIO driver
|
|
*
|
|
* Copyright (C) 2008, Volker Weiss <dev@tintuc.de>
|
|
* Copyright (C) 2007-2010 Florian Fainelli <florian@openwrt.org>
|
|
*
|
|
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/gpio.h>
|
|
|
|
#include <asm/rdc321x_defs.h>
|
|
|
|
struct rdc321x_gpio {
|
|
spinlock_t lock;
|
|
u32 data_reg[2];
|
|
} rdc321x_gpio_dev;
|
|
|
|
extern int rdc321x_pci_write(int reg, u32 val);
|
|
extern int rdc321x_pci_read(int reg, u32 *val);
|
|
|
|
/* read GPIO pin */
|
|
static int rdc_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
|
|
{
|
|
u32 value = 0;
|
|
int reg;
|
|
|
|
reg = gpio < 32 ? RDC321X_GPIO_DATA_REG1 : RDC321X_GPIO_DATA_REG2;
|
|
|
|
spin_lock(&rdc321x_gpio_dev.lock);
|
|
rdc321x_pci_write(reg, rdc321x_gpio_dev.data_reg[gpio < 32 ? 0 : 1]);
|
|
rdc321x_pci_read(reg, &value);
|
|
spin_unlock(&rdc321x_gpio_dev.lock);
|
|
|
|
return (1 << (gpio & 0x1f)) & value ? 1 : 0;
|
|
}
|
|
|
|
static void rdc_gpio_set_value_impl(struct gpio_chip *chip,
|
|
unsigned gpio, int value)
|
|
{
|
|
int reg = (gpio < 32) ? 0 : 1;
|
|
|
|
if (value)
|
|
rdc321x_gpio_dev.data_reg[reg] |= 1 << (gpio & 0x1f);
|
|
else
|
|
rdc321x_gpio_dev.data_reg[reg] &= ~(1 << (gpio & 0x1f));
|
|
|
|
rdc321x_pci_write(reg ? RDC321X_GPIO_DATA_REG2 : RDC321X_GPIO_DATA_REG1,
|
|
rdc321x_gpio_dev.data_reg[reg]);
|
|
}
|
|
|
|
/* set GPIO pin to value */
|
|
static void rdc_gpio_set_value(struct gpio_chip *chip,
|
|
unsigned gpio, int value)
|
|
{
|
|
spin_lock(&rdc321x_gpio_dev.lock);
|
|
rdc_gpio_set_value_impl(chip, gpio, value);
|
|
spin_unlock(&rdc321x_gpio_dev.lock);
|
|
}
|
|
|
|
static int rdc_gpio_config(struct gpio_chip *chip,
|
|
unsigned gpio, int value)
|
|
{
|
|
int err;
|
|
u32 reg;
|
|
|
|
spin_lock(&rdc321x_gpio_dev.lock);
|
|
err = rdc321x_pci_read(gpio < 32 ? RDC321X_GPIO_CTRL_REG1 : RDC321X_GPIO_CTRL_REG2,
|
|
®);
|
|
if (err)
|
|
goto unlock;
|
|
|
|
reg |= 1 << (gpio & 0x1f);
|
|
|
|
err = rdc321x_pci_write(gpio < 32 ? RDC321X_GPIO_CTRL_REG1 : RDC321X_GPIO_CTRL_REG2,
|
|
reg);
|
|
if (err)
|
|
goto unlock;
|
|
|
|
rdc_gpio_set_value_impl(chip, gpio, value);
|
|
|
|
unlock:
|
|
spin_unlock(&rdc321x_gpio_dev.lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* configure GPIO pin as input */
|
|
static int rdc_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
|
|
{
|
|
return rdc_gpio_config(chip, gpio, 1);
|
|
}
|
|
|
|
static struct gpio_chip rdc321x_gpio_chip = {
|
|
.label = "rdc321x-gpio",
|
|
.direction_input = rdc_gpio_direction_input,
|
|
.direction_output = rdc_gpio_config,
|
|
.get = rdc_gpio_get_value,
|
|
.set = rdc_gpio_set_value,
|
|
.base = 0,
|
|
.ngpio = RDC321X_MAX_GPIO,
|
|
};
|
|
|
|
/* initially setup the 2 copies of the gpio data registers.
|
|
This function is called before the platform setup code. */
|
|
static int __devinit rdc321x_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
int err;
|
|
|
|
/* this might not be, what others (BIOS, bootloader, etc.)
|
|
wrote to these registers before, but it's a good guess. Still
|
|
better than just using 0xffffffff. */
|
|
err = rdc321x_pci_read(RDC321X_GPIO_DATA_REG1, &rdc321x_gpio_dev.data_reg[0]);
|
|
if (err)
|
|
return err;
|
|
|
|
err = rdc321x_pci_read(RDC321X_GPIO_DATA_REG2, &rdc321x_gpio_dev.data_reg[1]);
|
|
if (err)
|
|
return err;
|
|
|
|
spin_lock_init(&rdc321x_gpio_dev.lock);
|
|
|
|
printk(KERN_INFO "rdc321x: registering %d GPIOs\n", rdc321x_gpio_chip.ngpio);
|
|
return gpiochip_add(&rdc321x_gpio_chip);
|
|
}
|
|
|
|
static int __devexit rdc321x_gpio_remove(struct platform_device *pdev)
|
|
{
|
|
gpiochip_remove(&rdc321x_gpio_chip);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver rdc321x_gpio_driver = {
|
|
.driver.name = "rdc321x-gpio",
|
|
.driver.owner = THIS_MODULE,
|
|
.probe = rdc321x_gpio_probe,
|
|
.remove = __devexit_p(rdc321x_gpio_remove),
|
|
};
|
|
|
|
static int __init rdc321x_gpio_init(void)
|
|
{
|
|
return platform_driver_register(&rdc321x_gpio_driver);
|
|
}
|
|
|
|
static void __exit rdc321x_gpio_exit(void)
|
|
{
|
|
platform_driver_unregister(&rdc321x_gpio_driver);
|
|
}
|
|
|
|
module_init(rdc321x_gpio_init);
|
|
module_exit(rdc321x_gpio_exit);
|
|
|
|
MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
|
|
MODULE_DESCRIPTION("RDC321x GPIO driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:rdc321x-gpio");
|