mirror of
https://github.com/torvalds/linux.git
synced 2024-11-17 17:41:44 +00:00
14476007c9
TXx9 GPIO set/get routines are spinlock-safe. This patch make
gpio_direction_{input,output} routines also spinlock-safe so that they
can be used during early board setup.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/*
|
|
* A gpio chip driver for TXx9 SoCs
|
|
*
|
|
* Copyright (C) 2008 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/io.h>
|
|
#include <asm/txx9pio.h>
|
|
|
|
static DEFINE_SPINLOCK(txx9_gpio_lock);
|
|
|
|
static struct txx9_pio_reg __iomem *txx9_pioptr;
|
|
|
|
static int txx9_gpio_get(struct gpio_chip *chip, unsigned int offset)
|
|
{
|
|
return __raw_readl(&txx9_pioptr->din) & (1 << offset);
|
|
}
|
|
|
|
static void txx9_gpio_set_raw(unsigned int offset, int value)
|
|
{
|
|
u32 val;
|
|
val = __raw_readl(&txx9_pioptr->dout);
|
|
if (value)
|
|
val |= 1 << offset;
|
|
else
|
|
val &= ~(1 << offset);
|
|
__raw_writel(val, &txx9_pioptr->dout);
|
|
}
|
|
|
|
static void txx9_gpio_set(struct gpio_chip *chip, unsigned int offset,
|
|
int value)
|
|
{
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&txx9_gpio_lock, flags);
|
|
txx9_gpio_set_raw(offset, value);
|
|
mmiowb();
|
|
spin_unlock_irqrestore(&txx9_gpio_lock, flags);
|
|
}
|
|
|
|
static int txx9_gpio_dir_in(struct gpio_chip *chip, unsigned int offset)
|
|
{
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&txx9_gpio_lock, flags);
|
|
__raw_writel(__raw_readl(&txx9_pioptr->dir) & ~(1 << offset),
|
|
&txx9_pioptr->dir);
|
|
mmiowb();
|
|
spin_unlock_irqrestore(&txx9_gpio_lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
static int txx9_gpio_dir_out(struct gpio_chip *chip, unsigned int offset,
|
|
int value)
|
|
{
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&txx9_gpio_lock, flags);
|
|
txx9_gpio_set_raw(offset, value);
|
|
__raw_writel(__raw_readl(&txx9_pioptr->dir) | (1 << offset),
|
|
&txx9_pioptr->dir);
|
|
mmiowb();
|
|
spin_unlock_irqrestore(&txx9_gpio_lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
static struct gpio_chip txx9_gpio_chip = {
|
|
.get = txx9_gpio_get,
|
|
.set = txx9_gpio_set,
|
|
.direction_input = txx9_gpio_dir_in,
|
|
.direction_output = txx9_gpio_dir_out,
|
|
.label = "TXx9",
|
|
};
|
|
|
|
int __init txx9_gpio_init(unsigned long baseaddr,
|
|
unsigned int base, unsigned int num)
|
|
{
|
|
txx9_pioptr = ioremap(baseaddr, sizeof(struct txx9_pio_reg));
|
|
if (!txx9_pioptr)
|
|
return -ENODEV;
|
|
txx9_gpio_chip.base = base;
|
|
txx9_gpio_chip.ngpio = num;
|
|
return gpiochip_add(&txx9_gpio_chip);
|
|
}
|