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/sysdev.h>
  19 #include <linux/ioport.h>
  20 #include <linux/io.h>
  21 #include <linux/gpio.h>
  22
  23 #include <mach/gpio-core.h>
  24 #include <mach/hardware.h>
  25 #include <asm/irq.h>
  26 #include <plat/pm.h>
  27
  28 #include <mach/regs-gpio.h>
  29
  30 static int s3c24xx_gpiolib_banka_input(struct gpio_chip *chip, unsigned offset)
  31 {
  32         return -EINVAL;
  33 }
  34
  35 static int s3c24xx_gpiolib_banka_output(struct gpio_chip *chip,
  36                                         unsigned offset, int value)
  37 {
  38         struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
  39         void __iomem *base = ourchip->base;
  40         unsigned long flags;
  41         unsigned long dat;
  42         unsigned long con;
  43
  44         local_irq_save(flags);
  45
  46         con = __raw_readl(base + 0x00);
  47         dat = __raw_readl(base + 0x04);
  48
  49         dat &= ~(1 << offset);
  50         if (value)
  51                 dat |= 1 << offset;
  52
  53         __raw_writel(dat, base + 0x04);
  54
  55         con &= ~(1 << offset);
  56
  57         __raw_writel(con, base + 0x00);
  58         __raw_writel(dat, base + 0x04);
  59
  60         local_irq_restore(flags);
  61         return 0;
  62 }
  63
  64 static int s3c24xx_gpiolib_bankf_toirq(struct gpio_chip *chip, unsigned offset)
  65 {
  66         if (offset < 4)
  67                 return IRQ_EINT0 + offset;
  68
  69         if (offset < 8)
  70                 return IRQ_EINT4 + offset - 4;
  71
  72         return -EINVAL;
  73 }
  74
  75 static int s3c24xx_gpiolib_bankg_toirq(struct gpio_chip *chip, unsigned offset)
  76 {
  77         return IRQ_EINT8 + offset;
  78 }
  79
  80 struct s3c_gpio_chip s3c24xx_gpios[] = {
  81         [0] = {
  82                 .base   = S3C2410_GPACON,
  83                 .pm     = __gpio_pm(&s3c_gpio_pm_1bit),
  84                 .chip   = {
  85                         .base                   = S3C2410_GPA(0),
  86                         .owner                  = THIS_MODULE,
  87                         .label                  = "GPIOA",
  88                         .ngpio                  = 24,
  89                         .direction_input        = s3c24xx_gpiolib_banka_input,
  90                         .direction_output       = s3c24xx_gpiolib_banka_output,
  91                 },
  92         },
  93         [1] = {
  94                 .base   = S3C2410_GPBCON,
  95                 .pm     = __gpio_pm(&s3c_gpio_pm_2bit),
  96                 .chip   = {
  97                         .base                   = S3C2410_GPB(0),
  98                         .owner                  = THIS_MODULE,
  99                         .label                  = "GPIOB",
 100                         .ngpio                  = 16,
 101                 },
 102         },
 103         [2] = {
 104                 .base   = S3C2410_GPCCON,
 105                 .pm     = __gpio_pm(&s3c_gpio_pm_2bit),
 106                 .chip   = {
 107                         .base                   = S3C2410_GPC(0),
 108                         .owner                  = THIS_MODULE,
 109                         .label                  = "GPIOC",
 110                         .ngpio                  = 16,
 111                 },
 112         },
 113         [3] = {
 114                 .base   = S3C2410_GPDCON,
 115                 .pm     = __gpio_pm(&s3c_gpio_pm_2bit),
 116                 .chip   = {
 117                         .base                   = S3C2410_GPD(0),
 118                         .owner                  = THIS_MODULE,
 119                         .label                  = "GPIOD",
 120                         .ngpio                  = 16,
 121                 },
 122         },
 123         [4] = {
 124                 .base   = S3C2410_GPECON,
 125                 .pm     = __gpio_pm(&s3c_gpio_pm_2bit),
 126                 .chip   = {
 127                         .base                   = S3C2410_GPE(0),
 128                         .label                  = "GPIOE",
 129                         .owner                  = THIS_MODULE,
 130                         .ngpio                  = 16,
 131                 },
 132         },
 133         [5] = {
 134                 .base   = S3C2410_GPFCON,
 135                 .pm     = __gpio_pm(&s3c_gpio_pm_2bit),
 136                 .chip   = {
 137                         .base                   = S3C2410_GPF(0),
 138                         .owner                  = THIS_MODULE,
 139                         .label                  = "GPIOF",
 140                         .ngpio                  = 8,
 141                         .to_irq                 = s3c24xx_gpiolib_bankf_toirq,
 142                 },
 143         },
 144         [6] = {
 145                 .base   = S3C2410_GPGCON,
 146                 .pm     = __gpio_pm(&s3c_gpio_pm_2bit),
 147                 .chip   = {
 148                         .base                   = S3C2410_GPG(0),
 149                         .owner                  = THIS_MODULE,
 150                         .label                  = "GPIOG",
 151                         .ngpio                  = 16,
 152                         .to_irq                 = s3c24xx_gpiolib_bankg_toirq,
 153                 },
 154         }, {
 155                 .base   = S3C2410_GPHCON,
 156                 .pm     = __gpio_pm(&s3c_gpio_pm_2bit),
 157                 .chip   = {
 158                         .base                   = S3C2410_GPH(0),
 159                         .owner                  = THIS_MODULE,
 160                         .label                  = "GPIOH",
 161                         .ngpio                  = 11,
 162                 },
 163         },
 164 };
 165
 166 static __init int s3c24xx_gpiolib_init(void)
 167 {
 168         struct s3c_gpio_chip *chip = s3c24xx_gpios;
 169         int gpn;
 170
 171         for (gpn = 0; gpn < ARRAY_SIZE(s3c24xx_gpios); gpn++, chip++)
 172                 s3c_gpiolib_add(chip);
 173
 174         return 0;
 175 }
 176
 177 core_initcall(s3c24xx_gpiolib_init);