arch/arm/mach-s3c2410/s3c2410-gpio.c

   1 /* linux/arch/arm/mach-s3c2410/gpio.c
   2  *
   3  * Copyright (c) 2004-2006 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * S3C2410 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  * Changelog
  23  *      15-Jan-2006  LCVR  Splitted from gpio.c
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/module.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/ioport.h>
  31
  32 #include <asm/hardware.h>
  33 #include <asm/irq.h>
  34 #include <asm/io.h>
  35
  36 #include <asm/arch/regs-gpio.h>
  37
  38 int s3c2410_gpio_irqfilter(unsigned int pin, unsigned int on,
  39                            unsigned int config)
  40 {
  41         void __iomem *reg = S3C2410_EINFLT0;
  42         unsigned long flags;
  43         unsigned long val;
  44
  45         if (pin < S3C2410_GPG8 || pin > S3C2410_GPG15)
  46                 return -1;
  47
  48         config &= 0xff;
  49
  50         pin -= S3C2410_GPG8_EINT16;
  51         reg += pin & ~3;
  52
  53         local_irq_save(flags);
  54
  55         /* update filter width and clock source */
  56
  57         val = __raw_readl(reg);
  58         val &= ~(0xff << ((pin & 3) * 8));
  59         val |= config << ((pin & 3) * 8);
  60         __raw_writel(val, reg);
  61
  62         /* update filter enable */
  63
  64         val = __raw_readl(S3C2410_EXTINT2);
  65         val &= ~(1 << ((pin * 4) + 3));
  66         val |= on << ((pin * 4) + 3);
  67         __raw_writel(val, S3C2410_EXTINT2);
  68
  69         local_irq_restore(flags);
  70
  71         return 0;
  72 }
  73
  74 EXPORT_SYMBOL(s3c2410_gpio_irqfilter);
  75
  76 int s3c2410_gpio_getirq(unsigned int pin)
  77 {
  78         if (pin < S3C2410_GPF0 || pin > S3C2410_GPG15_EINT23)
  79                 return -1;      /* not valid interrupts */
  80
  81         if (pin < S3C2410_GPG0 && pin > S3C2410_GPF7)
  82                 return -1;      /* not valid pin */
  83
  84         if (pin < S3C2410_GPF4)
  85                 return (pin - S3C2410_GPF0) + IRQ_EINT0;
  86
  87         if (pin < S3C2410_GPG0)
  88                 return (pin - S3C2410_GPF4) + IRQ_EINT4;
  89
  90         return (pin - S3C2410_GPG0) + IRQ_EINT8;
  91 }
  92
  93 EXPORT_SYMBOL(s3c2410_gpio_getirq);