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gpio: iop: Use generic GPIO MMIO functions for driver 

This patch switches the driver to use the generic GPIO MMIO functions
that removes a bit of redundant and duplicate code.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Alexander Shiyan 2016-09-09 09:20:03 +03:00 committed by Linus Walleij
parent 31963eb039
commit 6d125412fc
2 changed files with 24 additions and 94 deletions
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3
drivers/gpio/Kconfig
View File

@ -228,7 +228,8 @@ config GPIO_ICH
config GPIO_IOP
tristate "Intel IOP GPIO"
depends on ARM && (ARCH_IOP32X || ARCH_IOP33X)
depends on ARCH_IOP32X || ARCH_IOP33X || COMPILE_TEST
select GPIO_GENERIC
help
Say yes here to support the GPIO functionality of a number of Intel
IOP32X or IOP33X.

115
drivers/gpio/gpio-iop.c
View File

@ -10,111 +10,40 @@
* your option) any later version.
*/
#include <linux/device.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/gpio.h>
#include <linux/export.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/gpio/driver.h>
#include <linux/platform_device.h>
#include <linux/bitops.h>
#include <linux/io.h>
#define IOP3XX_N_GPIOS 8
#define GPIO_IN 0
#define GPIO_OUT 1
#define GPIO_LOW 0
#define GPIO_HIGH 1
/* Memory base offset */
static void __iomem *base;
#define IOP3XX_GPIO_REG(reg) (base + (reg))
#define IOP3XX_GPOE IOP3XX_GPIO_REG(0x0000)
#define IOP3XX_GPID IOP3XX_GPIO_REG(0x0004)
#define IOP3XX_GPOD IOP3XX_GPIO_REG(0x0008)
static void gpio_line_config(int line, int direction)
{
unsigned long flags;
u32 val;
local_irq_save(flags);
val = readl(IOP3XX_GPOE);
if (direction == GPIO_IN) {
val |= BIT(line);
} else if (direction == GPIO_OUT) {
val &= ~BIT(line);
}
writel(val, IOP3XX_GPOE);
local_irq_restore(flags);
}
static int gpio_line_get(int line)
{
return !!(readl(IOP3XX_GPID) & BIT(line));
}
static void gpio_line_set(int line, int value)
{
unsigned long flags;
u32 val;
local_irq_save(flags);
val = readl(IOP3XX_GPOD);
if (value == GPIO_LOW) {
val &= ~BIT(line);
} else if (value == GPIO_HIGH) {
val |= BIT(line);
}
writel(val, IOP3XX_GPOD);
local_irq_restore(flags);
}
static int iop3xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
gpio_line_config(gpio, GPIO_IN);
return 0;
}
static int iop3xx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level)
{
gpio_line_set(gpio, level);
gpio_line_config(gpio, GPIO_OUT);
return 0;
}
static int iop3xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
{
return gpio_line_get(gpio);
}
static void iop3xx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
{
gpio_line_set(gpio, value);
}
static struct gpio_chip iop3xx_chip = {
.label = "iop3xx",
.direction_input = iop3xx_gpio_direction_input,
.get = iop3xx_gpio_get_value,
.direction_output = iop3xx_gpio_direction_output,
.set = iop3xx_gpio_set_value,
.base = 0,
.ngpio = IOP3XX_N_GPIOS,
};
#define IOP3XX_GPOE 0x0000
#define IOP3XX_GPID 0x0004
#define IOP3XX_GPOD 0x0008
static int iop3xx_gpio_probe(struct platform_device *pdev)
{
struct resource *res;
struct gpio_chip *gc;
void __iomem *base;
int err;
gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
if (!gc)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
return devm_gpiochip_add_data(&pdev->dev, &iop3xx_chip, NULL);
err = bgpio_init(gc, &pdev->dev, 1, base + IOP3XX_GPID,
base + IOP3XX_GPOD, NULL, NULL, base + IOP3XX_GPOE, 0);
if (err)
return err;
gc->base = 0;
gc->owner = THIS_MODULE;
return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
}
static struct platform_driver iop3xx_gpio_driver = {