1 /* linux/arch/arm/mach-s3c2410/gpio.c
2 *
3 * Copyright (c) 2004-2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * S3C2410 GPIO 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 as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/init.h>
25 #include <linux/module.h>
26 #include <linux/interrupt.h>
27 #include <linux/ioport.h>
28 #include <linux/io.h>
29
30 #include <mach/hardware.h>
31 #include <asm/irq.h>
32
33 #include <mach/regs-gpio.h>
34
s3c2410_gpio_irqfilter(unsigned int pin,unsigned int on,unsigned int config)35 int s3c2410_gpio_irqfilter(unsigned int pin, unsigned int on,
36 unsigned int config)
37 {
38 void __iomem *reg = S3C24XX_EINFLT0;
39 unsigned long flags;
40 unsigned long val;
41
42 if (pin < S3C2410_GPG8 || pin > S3C2410_GPG15)
43 return -1;
44
45 config &= 0xff;
46
47 pin -= S3C2410_GPG8;
48 reg += pin & ~3;
49
50 local_irq_save(flags);
51
52 /* update filter width and clock source */
53
54 val = __raw_readl(reg);
55 val &= ~(0xff << ((pin & 3) * 8));
56 val |= config << ((pin & 3) * 8);
57 __raw_writel(val, reg);
58
59 /* update filter enable */
60
61 val = __raw_readl(S3C24XX_EXTINT2);
62 val &= ~(1 << ((pin * 4) + 3));
63 val |= on << ((pin * 4) + 3);
64 __raw_writel(val, S3C24XX_EXTINT2);
65
66 local_irq_restore(flags);
67
68 return 0;
69 }
70
71 EXPORT_SYMBOL(s3c2410_gpio_irqfilter);
72