54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
/* linux/arch/arm/mach-s3c2440/dsc.c
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*
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* Copyright (c) 2004-2005 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* Samsung S3C2440 Drive Strength Control 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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include <asm/mach/irq.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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#include <mach/regs-dsc.h>
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#include <plat/cpu.h>
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#include <plat/s3c2440.h>
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int s3c2440_set_dsc(unsigned int pin, unsigned int value)
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{
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void __iomem *base;
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unsigned long val;
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unsigned long flags;
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unsigned long mask;
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base = (pin & S3C2440_SELECT_DSC1) ? S3C2440_DSC1 : S3C2440_DSC0;
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mask = 3 << S3C2440_DSC_GETSHIFT(pin);
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local_irq_save(flags);
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val = __raw_readl(base);
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val &= ~mask;
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val |= value & mask;
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__raw_writel(val, base);
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local_irq_restore(flags);
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return 0;
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}
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EXPORT_SYMBOL(s3c2440_set_dsc);
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