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/* linux/arch/arm/mach-s3c2410/s3c2440-dsc.c
* Copyright (c) 2004-2005 Simtec Electronics
* Ben Dooks <>
* Samsung S3C2440 Drive Strength Control support
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
* Modifications:
* 29-Aug-2004 BJD Start of drive-strength control
* 09-Nov-2004 BJD Added symbol export
* 11-Jan-2005 BJD Include fix
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/module.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/arch/regs-gpio.h>
#include <asm/arch/regs-dsc.h>
#include "cpu.h"
#include "s3c2440.h"
int s3c2440_set_dsc(unsigned int pin, unsigned int value)
void __iomem *base;
unsigned long val;
unsigned long flags;
unsigned long mask;
base = (pin & S3C2440_SELECT_DSC1) ? S3C2440_DSC1 : S3C2440_DSC0;
mask = 3 << S3C2440_DSC_GETSHIFT(pin);
val = __raw_readl(base);
val &= ~mask;
val |= value & mask;
__raw_writel(val, base);
return 0;