LXR linux/arch/arm/mach-s3c2440/dsc.c

   1/* linux/arch/arm/mach-s3c2440/dsc.c
   2 *
   3 * Copyright (c) 2004-2005 Simtec Electronics
   4 *   Ben Dooks <ben@simtec.co.uk>
   5 *
   6 * Samsung S3C2440 Drive Strength Control 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 version 2 as
  10 * published by the Free Software Foundation.
  11*/
  12
  13#include <linux/kernel.h>
  14#include <linux/types.h>
  15#include <linux/interrupt.h>
  16#include <linux/init.h>
  17#include <linux/module.h>
  18#include <linux/io.h>
  19
  20#include <asm/mach/arch.h>
  21#include <asm/mach/map.h>
  22#include <asm/mach/irq.h>
  23
  24#include <mach/hardware.h>
  25#include <asm/irq.h>
  26
  27#include <mach/regs-gpio.h>
  28#include <mach/regs-dsc.h>
  29
  30#include <plat/cpu.h>
  31#include <plat/s3c2440.h>
  32
  33int s3c2440_set_dsc(unsigned int pin, unsigned int value)
  34{
  35        void __iomem *base;
  36        unsigned long val;
  37        unsigned long flags;
  38        unsigned long mask;
  39
  40        base = (pin & S3C2440_SELECT_DSC1) ? S3C2440_DSC1 : S3C2440_DSC0;
  41        mask = 3 << S3C2440_DSC_GETSHIFT(pin);
  42
  43        local_irq_save(flags);
  44
  45        val = __raw_readl(base);
  46        val &= ~mask;
  47        val |= value & mask;
  48        __raw_writel(val, base);
  49
  50        local_irq_restore(flags);
  51        return 0;
  52}
  53
  54EXPORT_SYMBOL(s3c2440_set_dsc);
  55