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gpio: loongson: Use BIT() macros

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This switches the Loongson driver over to using the bitops BIT()
macros and drops some local variables and make the code easier
to read (in my opinion).

Cc: Keguang Zhang <keguang.zhang@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: linux-mips@linux-mips.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2018-04-13 12:20:24 +02:00
parent 70e703e741
commit a4e5db831a
1 changed files with 11 additions and 14 deletions
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25
drivers/gpio/gpio-loongson.c
View File

@ -19,6 +19,7 @@
#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/platform_device.h>
#include <linux/bitops.h>
#include <asm/types.h>
#include <loongson.h>
@ -31,6 +32,11 @@
#define LOONGSON_N_GPIO STLS2F_N_GPIO
#endif
/*
* Offset into the register where we read lines, we write them from offset 0.
* This offset is the only thing that stand between us and using
* GPIO_GENERIC.
*/
#define LOONGSON_GPIO_IN_OFFSET 16
static DEFINE_SPINLOCK(gpio_lock);
@ -38,30 +44,25 @@ static DEFINE_SPINLOCK(gpio_lock);
static int loongson_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
{
u32 val;
u32 mask;
mask = 1 << (gpio + LOONGSON_GPIO_IN_OFFSET);
spin_lock(&gpio_lock);
val = LOONGSON_GPIODATA;
spin_unlock(&gpio_lock);
return (val & mask) != 0;
return !!(val & BIT(gpio + LOONGSON_GPIO_IN_OFFSET));
}
static void loongson_gpio_set_value(struct gpio_chip *chip,
unsigned gpio, int value)
{
u32 val;
u32 mask;
mask = 1 << gpio;
spin_lock(&gpio_lock);
val = LOONGSON_GPIODATA;
if (value)
val |= mask;
val |= BIT(gpio);
else
val &= (~mask);
val &= ~BIT(gpio);
LOONGSON_GPIODATA = val;
spin_unlock(&gpio_lock);
}
@ -69,12 +70,10 @@ static void loongson_gpio_set_value(struct gpio_chip *chip,
static int loongson_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
u32 temp;
u32 mask;
spin_lock(&gpio_lock);
mask = 1 << gpio;
temp = LOONGSON_GPIOIE;
temp |= mask;
temp |= BIT(gpio);
LOONGSON_GPIOIE = temp;
spin_unlock(&gpio_lock);
@ -85,13 +84,11 @@ static int loongson_gpio_direction_output(struct gpio_chip *chip,
unsigned gpio, int level)
{
u32 temp;
u32 mask;
loongson_gpio_set_value(chip, gpio, level);
spin_lock(&gpio_lock);
mask = 1 << gpio;
temp = LOONGSON_GPIOIE;
temp &= (~mask);
temp &= ~BIT(gpio);
LOONGSON_GPIOIE = temp;
spin_unlock(&gpio_lock);