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   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 <plat/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 struct s3c_gpio_chip gpios[] = {
  63         [0] = {
  64                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPA0),
  65                 .chip   = {
  66                         .base                   = S3C2410_GPA0,
  67                         .owner                  = THIS_MODULE,
  68                         .label                  = "GPIOA",
  69                         .ngpio                  = 24,
  70                         .direction_input        = s3c24xx_gpiolib_banka_input,
  71                         .direction_output       = s3c24xx_gpiolib_banka_output,
  72                 },
  73         },
  74         [1] = {
  75                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPB0),
  76                 .chip   = {
  77                         .base                   = S3C2410_GPB0,
  78                         .owner                  = THIS_MODULE,
  79                         .label                  = "GPIOB",
  80                         .ngpio                  = 16,
  81                 },
  82         },
  83         [2] = {
  84                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPC0),
  85                 .chip   = {
  86                         .base                   = S3C2410_GPC0,
  87                         .owner                  = THIS_MODULE,
  88                         .label                  = "GPIOC",
  89                         .ngpio                  = 16,
  90                 },
  91         },
  92         [3] = {
  93                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPD0),
  94                 .chip   = {
  95                         .base                   = S3C2410_GPD0,
  96                         .owner                  = THIS_MODULE,
  97                         .label                  = "GPIOD",
  98                         .ngpio                  = 16,
  99                 },
 100         },
 101         [4] = {
 102                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPE0),
 103                 .chip   = {
 104                         .base                   = S3C2410_GPE0,
 105                         .label                  = "GPIOE",
 106                         .owner                  = THIS_MODULE,
 107                         .ngpio                  = 16,
 108                 },
 109         },
 110         [5] = {
 111                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPF0),
 112                 .chip   = {
 113                         .base                   = S3C2410_GPF0,
 114                         .owner                  = THIS_MODULE,
 115                         .label                  = "GPIOF",
 116                         .ngpio                  = 8,
 117                 },
 118         },
 119         [6] = {
 120                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPG0),
 121                 .chip   = {
 122                         .base                   = S3C2410_GPG0,
 123                         .owner                  = THIS_MODULE,
 124                         .label                  = "GPIOG",
 125                         .ngpio                  = 10,
 126                 },
 127         },
 128 };
 129
 130 static __init int s3c24xx_gpiolib_init(void)
 131 {
 132         struct s3c_gpio_chip *chip = gpios;
 133         int gpn;
 134
 135         for (gpn = 0; gpn < ARRAY_SIZE(gpios); gpn++, chip++)
 136                 s3c_gpiolib_add(chip);
 137
 138         return 0;
 139 }
 140
 141 arch_initcall(s3c24xx_gpiolib_init);