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/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* Copyright (C) 2010 John Crispin <blogic@openwrt.org>
*/
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <lantiq_soc.h>
#define LTQ_GPIO_OUT 0x00
#define LTQ_GPIO_IN 0x04
#define LTQ_GPIO_DIR 0x08
#define LTQ_GPIO_ALTSEL0 0x0C
#define LTQ_GPIO_ALTSEL1 0x10
#define LTQ_GPIO_OD 0x14
#define PINS_PER_PORT 16
#define MAX_PORTS 3
#define ltq_gpio_getbit(m, r, p) (!!(ltq_r32(m + r) & (1 << p)))
#define ltq_gpio_setbit(m, r, p) ltq_w32_mask(0, (1 << p), m + r)
#define ltq_gpio_clearbit(m, r, p) ltq_w32_mask((1 << p), 0, m + r)
struct ltq_gpio {
void __iomem *membase;
struct gpio_chip chip;
};
static struct ltq_gpio ltq_gpio_port[MAX_PORTS];
int gpio_to_irq(unsigned int gpio)
{
return -EINVAL;
}
EXPORT_SYMBOL(gpio_to_irq);
int irq_to_gpio(unsigned int gpio)
{
return -EINVAL;
}
EXPORT_SYMBOL(irq_to_gpio);
int ltq_gpio_request(unsigned int pin, unsigned int alt0,
unsigned int alt1, unsigned int dir, const char *name)
{
int id = 0;
if (pin >= (MAX_PORTS * PINS_PER_PORT))
return -EINVAL;
if (gpio_request(pin, name)) {
pr_err("failed to setup lantiq gpio: %s\n", name);
return -EBUSY;
}
if (dir)
gpio_direction_output(pin, 1);
else
gpio_direction_input(pin);
while (pin >= PINS_PER_PORT) {
pin -= PINS_PER_PORT;
id++;
}
if (alt0)
ltq_gpio_setbit(ltq_gpio_port[id].membase,
LTQ_GPIO_ALTSEL0, pin);
else
ltq_gpio_clearbit(ltq_gpio_port[id].membase,
LTQ_GPIO_ALTSEL0, pin);
if (alt1)
ltq_gpio_setbit(ltq_gpio_port[id].membase,
LTQ_GPIO_ALTSEL1, pin);
else
ltq_gpio_clearbit(ltq_gpio_port[id].membase,
LTQ_GPIO_ALTSEL1, pin);
return 0;
}
EXPORT_SYMBOL(ltq_gpio_request);
static void ltq_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
{
struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
if (value)
ltq_gpio_setbit(ltq_gpio->membase, LTQ_GPIO_OUT, offset);
else
ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_OUT, offset);
}
static int ltq_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
return ltq_gpio_getbit(ltq_gpio->membase, LTQ_GPIO_IN, offset);
}
static int ltq_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
{
struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_OD, offset);
ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_DIR, offset);
return 0;
}
static int ltq_gpio_direction_output(struct gpio_chip *chip,
unsigned int offset, int value)
{
struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
ltq_gpio_setbit(ltq_gpio->membase, LTQ_GPIO_OD, offset);
ltq_gpio_setbit(ltq_gpio->membase, LTQ_GPIO_DIR, offset);
ltq_gpio_set(chip, offset, value);
return 0;
}
static int ltq_gpio_req(struct gpio_chip *chip, unsigned offset)
{
struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_ALTSEL0, offset);
ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_ALTSEL1, offset);
return 0;
}
static int ltq_gpio_probe(struct platform_device *pdev)
{
struct resource *res;
if (pdev->id >= MAX_PORTS) {
dev_err(&pdev->dev, "invalid gpio port %d\n",
pdev->id);
return -EINVAL;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "failed to get memory for gpio port %d\n",
pdev->id);
return -ENOENT;
}
res = devm_request_mem_region(&pdev->dev, res->start,
resource_size(res), dev_name(&pdev->dev));
if (!res) {
dev_err(&pdev->dev,
"failed to request memory for gpio port %d\n",
pdev->id);
return -EBUSY;
}
ltq_gpio_port[pdev->id].membase = devm_ioremap_nocache(&pdev->dev,
res->start, resource_size(res));
if (!ltq_gpio_port[pdev->id].membase) {
dev_err(&pdev->dev, "failed to remap memory for gpio port %d\n",
pdev->id);
return -ENOMEM;
}
ltq_gpio_port[pdev->id].chip.label = "ltq_gpio";
ltq_gpio_port[pdev->id].chip.direction_input = ltq_gpio_direction_input;
ltq_gpio_port[pdev->id].chip.direction_output =
ltq_gpio_direction_output;
ltq_gpio_port[pdev->id].chip.get = ltq_gpio_get;
ltq_gpio_port[pdev->id].chip.set = ltq_gpio_set;
ltq_gpio_port[pdev->id].chip.request = ltq_gpio_req;
ltq_gpio_port[pdev->id].chip.base = PINS_PER_PORT * pdev->id;
ltq_gpio_port[pdev->id].chip.ngpio = PINS_PER_PORT;
platform_set_drvdata(pdev, <q_gpio_port[pdev->id]);
return gpiochip_add(<q_gpio_port[pdev->id].chip);
}
static struct platform_driver
ltq_gpio_driver = {
.probe = ltq_gpio_probe,
.driver = {
.name = "ltq_gpio",
.owner = THIS_MODULE,
},
};
int __init ltq_gpio_init(void)
{
int ret = platform_driver_register(<q_gpio_driver);
if (ret)
pr_info("ltq_gpio : Error registering platfom driver!");
return ret;
}
postcore_initcall(ltq_gpio_init);
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