| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* linux/arch/arm/mach-s3c2410/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 | * Modifications: |
| 13 | * 29-Aug-2004 BJD Start of drive-strength control |
| 14 | * 09-Nov-2004 BJD Added symbol export |
| 15 | * 11-Jan-2005 BJD Include fix |
| 16 | */ |
| 17 | |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/types.h> |
| 20 | #include <linux/interrupt.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/module.h> |
| 23 | |
| 24 | #include <asm/mach/arch.h> |
| 25 | #include <asm/mach/map.h> |
| 26 | #include <asm/mach/irq.h> |
| 27 | |
| 28 | #include <asm/hardware.h> |
| 29 | #include <asm/io.h> |
| 30 | #include <asm/irq.h> |
| 31 | |
| 32 | #include <asm/arch/regs-gpio.h> |
| 33 | #include <asm/arch/regs-dsc.h> |
| 34 | |
| 35 | #include "cpu.h" |
| 36 | #include "s3c2440.h" |
| 37 | |
| 38 | int s3c2440_set_dsc(unsigned int pin, unsigned int value) |
| 39 | { |
| 40 | void __iomem *base; |
| 41 | unsigned long val; |
| 42 | unsigned long flags; |
| 43 | unsigned long mask; |
| 44 | |
| 45 | base = (pin & S3C2440_SELECT_DSC1) ? S3C2440_DSC1 : S3C2440_DSC0; |
| 46 | mask = 3 << S3C2440_DSC_GETSHIFT(pin); |
| 47 | |
| 48 | local_irq_save(flags); |
| 49 | |
| 50 | val = __raw_readl(base); |
| 51 | val &= ~mask; |
| 52 | val |= value & mask; |
| 53 | __raw_writel(val, base); |
| 54 | |
| 55 | local_irq_restore(flags); |
| 56 | return 0; |
| 57 | } |
| 58 | |
| 59 | EXPORT_SYMBOL(s3c2440_set_dsc); |