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Linux/arch/mips/kernel/gpio_txx9.c

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  1 /*
  2  * A gpio chip driver for TXx9 SoCs
  3  *
  4  * Copyright (C) 2008 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 
 11 #include <linux/init.h>
 12 #include <linux/spinlock.h>
 13 #include <linux/gpio/driver.h>
 14 #include <linux/errno.h>
 15 #include <linux/io.h>
 16 #include <asm/txx9pio.h>
 17 
 18 static DEFINE_SPINLOCK(txx9_gpio_lock);
 19 
 20 static struct txx9_pio_reg __iomem *txx9_pioptr;
 21 
 22 static int txx9_gpio_get(struct gpio_chip *chip, unsigned int offset)
 23 {
 24         return !!(__raw_readl(&txx9_pioptr->din) & (1 << offset));
 25 }
 26 
 27 static void txx9_gpio_set_raw(unsigned int offset, int value)
 28 {
 29         u32 val;
 30         val = __raw_readl(&txx9_pioptr->dout);
 31         if (value)
 32                 val |= 1 << offset;
 33         else
 34                 val &= ~(1 << offset);
 35         __raw_writel(val, &txx9_pioptr->dout);
 36 }
 37 
 38 static void txx9_gpio_set(struct gpio_chip *chip, unsigned int offset,
 39                           int value)
 40 {
 41         unsigned long flags;
 42         spin_lock_irqsave(&txx9_gpio_lock, flags);
 43         txx9_gpio_set_raw(offset, value);
 44         mmiowb();
 45         spin_unlock_irqrestore(&txx9_gpio_lock, flags);
 46 }
 47 
 48 static int txx9_gpio_dir_in(struct gpio_chip *chip, unsigned int offset)
 49 {
 50         unsigned long flags;
 51         spin_lock_irqsave(&txx9_gpio_lock, flags);
 52         __raw_writel(__raw_readl(&txx9_pioptr->dir) & ~(1 << offset),
 53                      &txx9_pioptr->dir);
 54         mmiowb();
 55         spin_unlock_irqrestore(&txx9_gpio_lock, flags);
 56         return 0;
 57 }
 58 
 59 static int txx9_gpio_dir_out(struct gpio_chip *chip, unsigned int offset,
 60                              int value)
 61 {
 62         unsigned long flags;
 63         spin_lock_irqsave(&txx9_gpio_lock, flags);
 64         txx9_gpio_set_raw(offset, value);
 65         __raw_writel(__raw_readl(&txx9_pioptr->dir) | (1 << offset),
 66                      &txx9_pioptr->dir);
 67         mmiowb();
 68         spin_unlock_irqrestore(&txx9_gpio_lock, flags);
 69         return 0;
 70 }
 71 
 72 static struct gpio_chip txx9_gpio_chip = {
 73         .get = txx9_gpio_get,
 74         .set = txx9_gpio_set,
 75         .direction_input = txx9_gpio_dir_in,
 76         .direction_output = txx9_gpio_dir_out,
 77         .label = "TXx9",
 78 };
 79 
 80 int __init txx9_gpio_init(unsigned long baseaddr,
 81                           unsigned int base, unsigned int num)
 82 {
 83         txx9_pioptr = ioremap(baseaddr, sizeof(struct txx9_pio_reg));
 84         if (!txx9_pioptr)
 85                 return -ENODEV;
 86         txx9_gpio_chip.base = base;
 87         txx9_gpio_chip.ngpio = num;
 88         return gpiochip_add_data(&txx9_gpio_chip, NULL);
 89 }
 90 

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