| /* linux/arch/arm/mach-s3c2440/dsc.c |
| * |
| * Copyright (c) 2004-2005 Simtec Electronics |
| * Ben Dooks <ben@simtec.co.uk> |
| * |
| * 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. |
| */ |
| |
| #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 <mach/hardware.h> |
| #include <asm/io.h> |
| #include <asm/irq.h> |
| |
| #include <mach/regs-gpio.h> |
| #include <mach/regs-dsc.h> |
| |
| #include <asm/plat-s3c24xx/cpu.h> |
| #include <asm/plat-s3c24xx/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); |
| |
| local_irq_save(flags); |
| |
| val = __raw_readl(base); |
| val &= ~mask; |
| val |= value & mask; |
| __raw_writel(val, base); |
| |
| local_irq_restore(flags); |
| return 0; |
| } |
| |
| EXPORT_SYMBOL(s3c2440_set_dsc); |