drivers/gpio/gpio-sa1100.c

   1 /*
   2  * linux/arch/arm/mach-sa1100/gpio.c
   3  *
   4  * Generic SA-1100 GPIO handling
   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 #include <linux/gpio.h>
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/io.h>
  14 #include <mach/hardware.h>
  15 #include <mach/irqs.h>
  16
  17 static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset)
  18 {
  19         return GPLR & GPIO_GPIO(offset);
  20 }
  21
  22 static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
  23 {
  24         if (value)
  25                 GPSR = GPIO_GPIO(offset);
  26         else
  27                 GPCR = GPIO_GPIO(offset);
  28 }
  29
  30 static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset)
  31 {
  32         unsigned long flags;
  33
  34         local_irq_save(flags);
  35         GPDR &= ~GPIO_GPIO(offset);
  36         local_irq_restore(flags);
  37         return 0;
  38 }
  39
  40 static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int value)
  41 {
  42         unsigned long flags;
  43
  44         local_irq_save(flags);
  45         sa1100_gpio_set(chip, offset, value);
  46         GPDR |= GPIO_GPIO(offset);
  47         local_irq_restore(flags);
  48         return 0;
  49 }
  50
  51 static int sa1100_to_irq(struct gpio_chip *chip, unsigned offset)
  52 {
  53         return offset < 11 ? (IRQ_GPIO0 + offset) : (IRQ_GPIO11 - 11 + offset);
  54 }
  55
  56 static struct gpio_chip sa1100_gpio_chip = {
  57         .label                  = "gpio",
  58         .direction_input        = sa1100_direction_input,
  59         .direction_output       = sa1100_direction_output,
  60         .set                    = sa1100_gpio_set,
  61         .get                    = sa1100_gpio_get,
  62         .to_irq                 = sa1100_to_irq,
  63         .base                   = 0,
  64         .ngpio                  = GPIO_MAX + 1,
  65 };
  66
  67 void __init sa1100_init_gpio(void)
  68 {
  69         gpiochip_add(&sa1100_gpio_chip);
  70 }