mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-08-27 15:36:48 +00:00
d9d87d90cc
The conversion of all GPIO drivers to using the .set_rv() and .set_multiple_rv() callbacks from struct gpio_chip (which - unlike their predecessors - return an integer and allow the controller drivers to indicate failures to users) is now complete and the legacy ones have been removed. Rename the new callbacks back to their original names in one sweeping change. Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* A gpio chip driver for TXx9 SoCs
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*
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* Copyright (C) 2008 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
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*/
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/gpio/driver.h>
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <asm/txx9pio.h>
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static DEFINE_SPINLOCK(txx9_gpio_lock);
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static struct txx9_pio_reg __iomem *txx9_pioptr;
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static int txx9_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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return !!(__raw_readl(&txx9_pioptr->din) & (1 << offset));
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}
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static void txx9_gpio_set_raw(unsigned int offset, int value)
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{
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u32 val;
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val = __raw_readl(&txx9_pioptr->dout);
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if (value)
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val |= 1 << offset;
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else
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val &= ~(1 << offset);
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__raw_writel(val, &txx9_pioptr->dout);
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}
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static int txx9_gpio_set(struct gpio_chip *chip, unsigned int offset,
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int value)
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{
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unsigned long flags;
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spin_lock_irqsave(&txx9_gpio_lock, flags);
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txx9_gpio_set_raw(offset, value);
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mmiowb();
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spin_unlock_irqrestore(&txx9_gpio_lock, flags);
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return 0;
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}
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static int txx9_gpio_dir_in(struct gpio_chip *chip, unsigned int offset)
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{
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unsigned long flags;
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spin_lock_irqsave(&txx9_gpio_lock, flags);
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__raw_writel(__raw_readl(&txx9_pioptr->dir) & ~(1 << offset),
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&txx9_pioptr->dir);
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mmiowb();
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spin_unlock_irqrestore(&txx9_gpio_lock, flags);
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return 0;
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}
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static int txx9_gpio_dir_out(struct gpio_chip *chip, unsigned int offset,
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int value)
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{
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unsigned long flags;
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spin_lock_irqsave(&txx9_gpio_lock, flags);
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txx9_gpio_set_raw(offset, value);
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__raw_writel(__raw_readl(&txx9_pioptr->dir) | (1 << offset),
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&txx9_pioptr->dir);
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mmiowb();
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spin_unlock_irqrestore(&txx9_gpio_lock, flags);
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return 0;
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}
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static struct gpio_chip txx9_gpio_chip = {
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.get = txx9_gpio_get,
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.set = txx9_gpio_set,
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.direction_input = txx9_gpio_dir_in,
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.direction_output = txx9_gpio_dir_out,
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.label = "TXx9",
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};
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int __init txx9_gpio_init(unsigned long baseaddr,
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unsigned int base, unsigned int num)
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{
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txx9_pioptr = ioremap(baseaddr, sizeof(struct txx9_pio_reg));
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if (!txx9_pioptr)
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return -ENODEV;
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txx9_gpio_chip.base = base;
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txx9_gpio_chip.ngpio = num;
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return gpiochip_add_data(&txx9_gpio_chip, NULL);
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}
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