+++ /dev/null
-/*
- * 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");
projects / openwrt.git / blobdiff