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a21765a7 | 1 | /* linux/arch/arm/mach-s3c2440/dsc.c |
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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. | |
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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 | ||
19 | #include <asm/mach/arch.h> | |
20 | #include <asm/mach/map.h> | |
21 | #include <asm/mach/irq.h> | |
22 | ||
a09e64fb | 23 | #include <mach/hardware.h> |
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24 | #include <asm/io.h> |
25 | #include <asm/irq.h> | |
26 | ||
a09e64fb RK |
27 | #include <mach/regs-gpio.h> |
28 | #include <mach/regs-dsc.h> | |
1da177e4 | 29 | |
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30 | #include <asm/plat-s3c24xx/cpu.h> |
31 | #include <asm/plat-s3c24xx/s3c2440.h> | |
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32 | |
33 | int 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 | ||
54 | EXPORT_SYMBOL(s3c2440_set_dsc); |