71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/* linux/arch/arm/mach-s3c2410/gpio.c
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*
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* Copyright (c) 2004-2006 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C2410 GPIO support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include <asm/irq.h>
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#include <mach/regs-gpio.h>
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int s3c2410_gpio_irqfilter(unsigned int pin, unsigned int on,
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unsigned int config)
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{
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void __iomem *reg = S3C24XX_EINFLT0;
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unsigned long flags;
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unsigned long val;
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if (pin < S3C2410_GPG8 || pin > S3C2410_GPG15)
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return -1;
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config &= 0xff;
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pin -= S3C2410_GPG8;
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reg += pin & ~3;
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local_irq_save(flags);
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/* update filter width and clock source */
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val = __raw_readl(reg);
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val &= ~(0xff << ((pin & 3) * 8));
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val |= config << ((pin & 3) * 8);
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__raw_writel(val, reg);
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/* update filter enable */
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val = __raw_readl(S3C24XX_EXTINT2);
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val &= ~(1 << ((pin * 4) + 3));
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val |= on << ((pin * 4) + 3);
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__raw_writel(val, S3C24XX_EXTINT2);
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local_irq_restore(flags);
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return 0;
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}
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EXPORT_SYMBOL(s3c2410_gpio_irqfilter);
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