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 #include <plat/pm.h>
  26
  27 #include <mach/regs-gpio.h>
  28
  29 static int s3c24xx_gpiolib_banka_input(struct gpio_chip *chip, unsigned offset)
  30 {
  31         return -EINVAL;
  32 }
  33
  34 static int s3c24xx_gpiolib_banka_output(struct gpio_chip *chip,
  35                                         unsigned offset, int value)
  36 {
  37         struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
  38         void __iomem *base = ourchip->base;
  39         unsigned long flags;
  40         unsigned long dat;
  41         unsigned long con;
  42
  43         local_irq_save(flags);
  44
  45         con = __raw_readl(base + 0x00);
  46         dat = __raw_readl(base + 0x04);
  47
  48         dat &= ~(1 << offset);
  49         if (value)
  50                 dat |= 1 << offset;
  51
  52         __raw_writel(dat, base + 0x04);
  53
  54         con &= ~(1 << offset);
  55
  56         __raw_writel(con, base + 0x00);
  57         __raw_writel(dat, base + 0x04);
  58
  59         local_irq_restore(flags);
  60         return 0;
  61 }
  62
  63 static int s3c24xx_gpiolib_bankf_toirq(struct gpio_chip *chip, unsigned offset)
  64 {
  65         if (offset < 4)
  66                 return IRQ_EINT0 + offset;
  67
  68         if (offset < 8)
  69                 return IRQ_EINT4 + offset - 4;
  70
  71         return -EINVAL;
  72 }
  73
  74 static int s3c24xx_gpiolib_bankg_toirq(struct gpio_chip *chip, unsigned offset)
  75 {
  76         return IRQ_EINT8 + offset;
  77 }
  78
  79 struct s3c_gpio_chip s3c24xx_gpios[] = {
  80         [0] = {
  81                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPA0),
  82                 .pm     = __gpio_pm(&s3c_gpio_pm_1bit),
  83                 .chip   = {
  84                         .base                   = S3C2410_GPA0,
  85                         .owner                  = THIS_MODULE,
  86                         .label                  = "GPIOA",
  87                         .ngpio                  = 24,
  88                         .direction_input        = s3c24xx_gpiolib_banka_input,
  89                         .direction_output       = s3c24xx_gpiolib_banka_output,
  90                 },
  91         },
  92         [1] = {
  93                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPB0),
  94                 .pm     = __gpio_pm(&s3c_gpio_pm_2bit),
  95                 .chip   = {
  96                         .base                   = S3C2410_GPB0,
  97                         .owner                  = THIS_MODULE,
  98                         .label                  = "GPIOB",
  99                         .ngpio                  = 16,
 100                 },
 101         },
 102         [2] = {
 103                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPC0),
 104                 .pm     = __gpio_pm(&s3c_gpio_pm_2bit),
 105                 .chip   = {
 106                         .base                   = S3C2410_GPC0,
 107                         .owner                  = THIS_MODULE,
 108                         .label                  = "GPIOC",
 109                         .ngpio                  = 16,
 110                 },
 111         },
 112         [3] = {
 113                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPD0),
 114                 .pm     = __gpio_pm(&s3c_gpio_pm_2bit),
 115                 .chip   = {
 116                         .base                   = S3C2410_GPD0,
 117                         .owner                  = THIS_MODULE,
 118                         .label                  = "GPIOD",
 119                         .ngpio                  = 16,
 120                 },
 121         },
 122         [4] = {
 123                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPE0),
 124                 .pm     = __gpio_pm(&s3c_gpio_pm_2bit),
 125                 .chip   = {
 126                         .base                   = S3C2410_GPE0,
 127                         .label                  = "GPIOE",
 128                         .owner                  = THIS_MODULE,
 129                         .ngpio                  = 16,
 130                 },
 131         },
 132         [5] = {
 133                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPF0),
 134                 .pm     = __gpio_pm(&s3c_gpio_pm_2bit),
 135                 .chip   = {
 136                         .base                   = S3C2410_GPF0,
 137                         .owner                  = THIS_MODULE,
 138                         .label                  = "GPIOF",
 139                         .ngpio                  = 8,
 140                         .to_irq                 = s3c24xx_gpiolib_bankf_toirq,
 141                 },
 142         },
 143         [6] = {
 144                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPG0),
 145                 .pm     = __gpio_pm(&s3c_gpio_pm_2bit),
 146                 .chip   = {
 147                         .base                   = S3C2410_GPG0,
 148                         .owner                  = THIS_MODULE,
 149                         .label                  = "GPIOG",
 150                         .ngpio                  = 10,
 151                         .to_irq                 = s3c24xx_gpiolib_bankg_toirq,
 152                 },
 153         },
 154 };
 155
 156 static __init int s3c24xx_gpiolib_init(void)
 157 {
 158         struct s3c_gpio_chip *chip = s3c24xx_gpios;
 159         int gpn;
 160
 161         for (gpn = 0; gpn < ARRAY_SIZE(s3c24xx_gpios); gpn++, chip++)
 162                 s3c_gpiolib_add(chip);
 163
 164         return 0;
 165 }
 166
 167 arch_initcall(s3c24xx_gpiolib_init);