Root/arch/arm/mach-s3c2412/gpio.c

1/* linux/arch/arm/mach-s3c2412/gpio.c
2 *
3 * Copyright (c) 2007 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * http://armlinux.simtec.co.uk/.
7 *
8 * S3C2412/S3C2413 specific GPIO support
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13*/
14
15#include <linux/kernel.h>
16#include <linux/types.h>
17#include <linux/module.h>
18#include <linux/interrupt.h>
19#include <linux/gpio.h>
20
21#include <asm/mach/arch.h>
22#include <asm/mach/map.h>
23
24#include <mach/regs-gpio.h>
25#include <mach/hardware.h>
26
27#include <plat/gpio-core.h>
28
29int s3c2412_gpio_set_sleepcfg(unsigned int pin, unsigned int state)
30{
31    struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
32    unsigned long offs = pin - chip->chip.base;
33    unsigned long flags;
34    unsigned long slpcon;
35
36    offs *= 2;
37
38    if (pin < S3C2410_GPB(0))
39        return -EINVAL;
40
41    if (pin >= S3C2410_GPF(0) &&
42        pin <= S3C2410_GPG(16))
43        return -EINVAL;
44
45    if (pin > S3C2410_GPH(16))
46        return -EINVAL;
47
48    local_irq_save(flags);
49
50    slpcon = __raw_readl(chip->base + 0x0C);
51
52    slpcon &= ~(3 << offs);
53    slpcon |= state << offs;
54
55    __raw_writel(slpcon, chip->base + 0x0C);
56
57    local_irq_restore(flags);
58
59    return 0;
60}
61
62EXPORT_SYMBOL(s3c2412_gpio_set_sleepcfg);
63

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