arch/arm/plat-s3c24xx/gpio.c

   1 /* linux/arch/arm/plat-s3c24xx/gpio.c
   2  *
   3  * Copyright (c) 2004-2005 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * S3C24XX GPIO support
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21 */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/init.h>
  25 #include <linux/module.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/ioport.h>
  28 #include <linux/io.h>
  29
  30 #include <mach/hardware.h>
  31 #include <mach/gpio-fns.h>
  32 #include <asm/irq.h>
  33
  34 #include <mach/regs-gpio.h>
  35
  36 unsigned int s3c2410_gpio_getcfg(unsigned int pin)
  37 {
  38         void __iomem *base = S3C24XX_GPIO_BASE(pin);
  39         unsigned long val = __raw_readl(base);
  40
  41         if (pin < S3C2410_GPIO_BANKB) {
  42                 val >>= S3C2410_GPIO_OFFSET(pin);
  43                 val &= 1;
  44                 val += 1;
  45         } else {
  46                 val >>= S3C2410_GPIO_OFFSET(pin)*2;
  47                 val &= 3;
  48         }
  49
  50         return val | S3C2410_GPIO_INPUT;
  51 }
  52
  53 EXPORT_SYMBOL(s3c2410_gpio_getcfg);
  54
  55 void s3c2410_gpio_pullup(unsigned int pin, unsigned int to)
  56 {
  57         void __iomem *base = S3C24XX_GPIO_BASE(pin);
  58         unsigned long offs = S3C2410_GPIO_OFFSET(pin);
  59         unsigned long flags;
  60         unsigned long up;
  61
  62         if (pin < S3C2410_GPIO_BANKB)
  63                 return;
  64
  65         local_irq_save(flags);
  66
  67         up = __raw_readl(base + 0x08);
  68         up &= ~(1L << offs);
  69         up |= to << offs;
  70         __raw_writel(up, base + 0x08);
  71
  72         local_irq_restore(flags);
  73 }
  74
  75 EXPORT_SYMBOL(s3c2410_gpio_pullup);
  76
  77
  78 void s3c2410_gpio_setpin(unsigned int pin, unsigned int to)
  79 {
  80         void __iomem *base = S3C24XX_GPIO_BASE(pin);
  81         unsigned long offs = S3C2410_GPIO_OFFSET(pin);
  82         unsigned long flags;
  83         unsigned long dat;
  84
  85         local_irq_save(flags);
  86
  87         dat = __raw_readl(base + 0x04);
  88         dat &= ~(1 << offs);
  89         dat |= to << offs;
  90         __raw_writel(dat, base + 0x04);
  91
  92         local_irq_restore(flags);
  93 }
  94
  95 EXPORT_SYMBOL(s3c2410_gpio_setpin);
  96
  97 unsigned int s3c2410_gpio_getpin(unsigned int pin)
  98 {
  99         void __iomem *base = S3C24XX_GPIO_BASE(pin);
 100         unsigned long offs = S3C2410_GPIO_OFFSET(pin);
 101
 102         return __raw_readl(base + 0x04) & (1<< offs);
 103 }
 104
 105 EXPORT_SYMBOL(s3c2410_gpio_getpin);
 106
 107 unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)
 108 {
 109         unsigned long flags;
 110         unsigned long misccr;
 111
 112         local_irq_save(flags);
 113         misccr = __raw_readl(S3C24XX_MISCCR);
 114         misccr &= ~clear;
 115         misccr ^= change;
 116         __raw_writel(misccr, S3C24XX_MISCCR);
 117         local_irq_restore(flags);
 118
 119         return misccr;
 120 }
 121
 122 EXPORT_SYMBOL(s3c2410_modify_misccr);
 123
 124 int s3c2410_gpio_getirq(unsigned int pin)
 125 {
 126         if (pin < S3C2410_GPF(0) || pin > S3C2410_GPG(15))
 127                 return -EINVAL; /* not valid interrupts */
 128
 129         if (pin < S3C2410_GPG(0) && pin > S3C2410_GPF(7))
 130                 return -EINVAL; /* not valid pin */
 131
 132         if (pin < S3C2410_GPF(4))
 133                 return (pin - S3C2410_GPF(0)) + IRQ_EINT0;
 134
 135         if (pin < S3C2410_GPG(0))
 136                 return (pin - S3C2410_GPF(4)) + IRQ_EINT4;
 137
 138         return (pin - S3C2410_GPG(0)) + IRQ_EINT8;
 139 }
 140
 141 EXPORT_SYMBOL(s3c2410_gpio_getirq);