arch/arm/plat-s3c24xx/gpiolib.c

   1 /* linux/arch/arm/plat-s3c24xx/gpiolib.c
   2  *
   3  * Copyright (c) 2008 Simtec Electronics
   4  *      http://armlinux.simtec.co.uk/
   5  *      Ben Dooks <ben@simtec.co.uk>
   6  *
   7  * S3C24XX GPIOlib support
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License.
  12 */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/ioport.h>
  19 #include <linux/io.h>
  20 #include <linux/gpio.h>
  21
  22 #include <mach/gpio-core.h>
  23 #include <mach/hardware.h>
  24 #include <asm/irq.h>
  25
  26 #include <mach/regs-gpio.h>
  27
  28 static int s3c24xx_gpiolib_banka_input(struct gpio_chip *chip, unsigned offset)
  29 {
  30         return -EINVAL;
  31 }
  32
  33 static int s3c24xx_gpiolib_banka_output(struct gpio_chip *chip,
  34                                         unsigned offset, int value)
  35 {
  36         struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
  37         void __iomem *base = ourchip->base;
  38         unsigned long flags;
  39         unsigned long dat;
  40         unsigned long con;
  41
  42         local_irq_save(flags);
  43
  44         con = __raw_readl(base + 0x00);
  45         dat = __raw_readl(base + 0x04);
  46
  47         dat &= ~(1 << offset);
  48         if (value)
  49                 dat |= 1 << offset;
  50
  51         __raw_writel(dat, base + 0x04);
  52
  53         con &= ~(1 << offset);
  54
  55         __raw_writel(con, base + 0x00);
  56         __raw_writel(dat, base + 0x04);
  57
  58         local_irq_restore(flags);
  59         return 0;
  60 }
  61
  62 static int s3c24xx_gpiolib_bankf_toirq(struct gpio_chip *chip, unsigned offset)
  63 {
  64         if (offset < 4)
  65                 return IRQ_EINT0 + offset;
  66
  67         if (offset < 8)
  68                 return IRQ_EINT4 + offset - 4;
  69
  70         return -EINVAL;
  71 }
  72
  73 static int s3c24xx_gpiolib_bankg_toirq(struct gpio_chip *chip, unsigned offset)
  74 {
  75         return IRQ_EINT8 + offset;
  76 }
  77
  78 struct s3c_gpio_chip s3c24xx_gpios[] = {
  79         [0] = {
  80                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPA0),
  81                 .chip   = {
  82                         .base                   = S3C2410_GPA0,
  83                         .owner                  = THIS_MODULE,
  84                         .label                  = "GPIOA",
  85                         .ngpio                  = 24,
  86                         .direction_input        = s3c24xx_gpiolib_banka_input,
  87                         .direction_output       = s3c24xx_gpiolib_banka_output,
  88                 },
  89         },
  90         [1] = {
  91                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPB0),
  92                 .chip   = {
  93                         .base                   = S3C2410_GPB0,
  94                         .owner                  = THIS_MODULE,
  95                         .label                  = "GPIOB",
  96                         .ngpio                  = 16,
  97                 },
  98         },
  99         [2] = {
 100                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPC0),
 101                 .chip   = {
 102                         .base                   = S3C2410_GPC0,
 103                         .owner                  = THIS_MODULE,
 104                         .label                  = "GPIOC",
 105                         .ngpio                  = 16,
 106                 },
 107         },
 108         [3] = {
 109                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPD0),
 110                 .chip   = {
 111                         .base                   = S3C2410_GPD0,
 112                         .owner                  = THIS_MODULE,
 113                         .label                  = "GPIOD",
 114                         .ngpio                  = 16,
 115                 },
 116         },
 117         [4] = {
 118                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPE0),
 119                 .chip   = {
 120                         .base                   = S3C2410_GPE0,
 121                         .label                  = "GPIOE",
 122                         .owner                  = THIS_MODULE,
 123                         .ngpio                  = 16,
 124                 },
 125         },
 126         [5] = {
 127                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPF0),
 128                 .chip   = {
 129                         .base                   = S3C2410_GPF0,
 130                         .owner                  = THIS_MODULE,
 131                         .label                  = "GPIOF",
 132                         .ngpio                  = 8,
 133                         .to_irq                 = s3c24xx_gpiolib_bankf_toirq,
 134                 },
 135         },
 136         [6] = {
 137                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPG0),
 138                 .chip   = {
 139                         .base                   = S3C2410_GPG0,
 140                         .owner                  = THIS_MODULE,
 141                         .label                  = "GPIOG",
 142                         .ngpio                  = 10,
 143                         .to_irq                 = s3c24xx_gpiolib_bankg_toirq,
 144                 },
 145         },
 146 };
 147
 148 static __init int s3c24xx_gpiolib_init(void)
 149 {
 150         struct s3c_gpio_chip *chip = s3c24xx_gpios;
 151         int gpn;
 152
 153         for (gpn = 0; gpn < ARRAY_SIZE(s3c24xx_gpios); gpn++, chip++)
 154                 s3c_gpiolib_add(chip);
 155
 156         return 0;
 157 }
 158
 159 arch_initcall(s3c24xx_gpiolib_init);