90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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 void 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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}
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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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