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/*
* CLPS711X GPIO driver
*
* Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>
*
* 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.
*/
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <mach/hardware.h>
#define CLPS711X_GPIO_PORTS 5
#define CLPS711X_GPIO_NAME "gpio-clps711x"
struct clps711x_gpio {
struct gpio_chip chip[CLPS711X_GPIO_PORTS];
spinlock_t lock;
};
static void __iomem *clps711x_ports[] = {
CLPS711X_VIRT_BASE + PADR,
CLPS711X_VIRT_BASE + PBDR,
CLPS711X_VIRT_BASE + PCDR,
CLPS711X_VIRT_BASE + PDDR,
CLPS711X_VIRT_BASE + PEDR,
};
static void __iomem *clps711x_pdirs[] = {
CLPS711X_VIRT_BASE + PADDR,
CLPS711X_VIRT_BASE + PBDDR,
CLPS711X_VIRT_BASE + PCDDR,
CLPS711X_VIRT_BASE + PDDDR,
CLPS711X_VIRT_BASE + PEDDR,
};
#define clps711x_port(x) clps711x_ports[x->base / 8]
#define clps711x_pdir(x) clps711x_pdirs[x->base / 8]
static int gpio_clps711x_get(struct gpio_chip *chip, unsigned offset)
{
return !!(readb(clps711x_port(chip)) & (1 << offset));
}
static void gpio_clps711x_set(struct gpio_chip *chip, unsigned offset,
int value)
{
int tmp;
unsigned long flags;
struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
spin_lock_irqsave(&gpio->lock, flags);
tmp = readb(clps711x_port(chip)) & ~(1 << offset);
if (value)
tmp |= 1 << offset;
writeb(tmp, clps711x_port(chip));
spin_unlock_irqrestore(&gpio->lock, flags);
}
static int gpio_clps711x_direction_in(struct gpio_chip *chip, unsigned offset)
{
int tmp;
unsigned long flags;
struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
spin_lock_irqsave(&gpio->lock, flags);
tmp = readb(clps711x_pdir(chip)) & ~(1 << offset);
writeb(tmp, clps711x_pdir(chip));
spin_unlock_irqrestore(&gpio->lock, flags);
return 0;
}
static int gpio_clps711x_direction_out(struct gpio_chip *chip, unsigned offset,
int value)
{
int tmp;
unsigned long flags;
struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
spin_lock_irqsave(&gpio->lock, flags);
tmp = readb(clps711x_pdir(chip)) | (1 << offset);
writeb(tmp, clps711x_pdir(chip));
tmp = readb(clps711x_port(chip)) & ~(1 << offset);
if (value)
tmp |= 1 << offset;
writeb(tmp, clps711x_port(chip));
spin_unlock_irqrestore(&gpio->lock, flags);
return 0;
}
struct clps711x_gpio_port {
char *name;
int nr;
};
static const struct clps711x_gpio_port clps711x_gpio_ports[] __initconst = {
{ "PORTA", 8, },
{ "PORTB", 8, },
{ "PORTC", 8, },
{ "PORTD", 8, },
{ "PORTE", 3, },
};
static int __init gpio_clps711x_init(void)
{
int i;
struct platform_device *pdev;
struct clps711x_gpio *gpio;
pdev = platform_device_alloc(CLPS711X_GPIO_NAME, 0);
if (!pdev) {
pr_err("Cannot create platform device: %s\n",
CLPS711X_GPIO_NAME);
return -ENOMEM;
}
platform_device_add(pdev);
gpio = devm_kzalloc(&pdev->dev, sizeof(struct clps711x_gpio),
GFP_KERNEL);
if (!gpio) {
dev_err(&pdev->dev, "GPIO allocating memory error\n");
platform_device_del(pdev);
platform_device_put(pdev);
return -ENOMEM;
}
platform_set_drvdata(pdev, gpio);
spin_lock_init(&gpio->lock);
for (i = 0; i < CLPS711X_GPIO_PORTS; i++) {
gpio->chip[i].owner = THIS_MODULE;
gpio->chip[i].dev = &pdev->dev;
gpio->chip[i].label = clps711x_gpio_ports[i].name;
gpio->chip[i].base = i * 8;
gpio->chip[i].ngpio = clps711x_gpio_ports[i].nr;
gpio->chip[i].direction_input = gpio_clps711x_direction_in;
gpio->chip[i].get = gpio_clps711x_get;
gpio->chip[i].direction_output = gpio_clps711x_direction_out;
gpio->chip[i].set = gpio_clps711x_set;
WARN_ON(gpiochip_add(&gpio->chip[i]));
}
dev_info(&pdev->dev, "GPIO driver initialized\n");
return 0;
}
arch_initcall(gpio_clps711x_init);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
MODULE_DESCRIPTION("CLPS711X GPIO driver");
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