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Diffstat (limited to 'arch/arm/mach-s3c2410/s3c2410-gpio.c')
-rw-r--r--arch/arm/mach-s3c2410/s3c2410-gpio.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c2410/s3c2410-gpio.c b/arch/arm/mach-s3c2410/s3c2410-gpio.c
new file mode 100644
index 000000000000..d5e1caea1d23
--- /dev/null
+++ b/arch/arm/mach-s3c2410/s3c2410-gpio.c
@@ -0,0 +1,93 @@
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 * Changelog
23 * 15-Jan-2006 LCVR Splitted from gpio.c
24 */
25
26#include <linux/kernel.h>
27#include <linux/init.h>
28#include <linux/module.h>
29#include <linux/interrupt.h>
30#include <linux/ioport.h>
31
32#include <asm/hardware.h>
33#include <asm/irq.h>
34#include <asm/io.h>
35
36#include <asm/arch/regs-gpio.h>
37
38int s3c2410_gpio_irqfilter(unsigned int pin, unsigned int on,
39 unsigned int config)
40{
41 void __iomem *reg = S3C2410_EINFLT0;
42 unsigned long flags;
43 unsigned long val;
44
45 if (pin < S3C2410_GPG8 || pin > S3C2410_GPG15)
46 return -1;
47
48 config &= 0xff;
49
50 pin -= S3C2410_GPG8_EINT16;
51 reg += pin & ~3;
52
53 local_irq_save(flags);
54
55 /* update filter width and clock source */
56
57 val = __raw_readl(reg);
58 val &= ~(0xff << ((pin & 3) * 8));
59 val |= config << ((pin & 3) * 8);
60 __raw_writel(val, reg);
61
62 /* update filter enable */
63
64 val = __raw_readl(S3C2410_EXTINT2);
65 val &= ~(1 << ((pin * 4) + 3));
66 val |= on << ((pin * 4) + 3);
67 __raw_writel(val, S3C2410_EXTINT2);
68
69 local_irq_restore(flags);
70
71 return 0;
72}
73
74EXPORT_SYMBOL(s3c2410_gpio_irqfilter);
75
76int s3c2410_gpio_getirq(unsigned int pin)
77{
78 if (pin < S3C2410_GPF0 || pin > S3C2410_GPG15_EINT23)
79 return -1; /* not valid interrupts */
80
81 if (pin < S3C2410_GPG0 && pin > S3C2410_GPF7)
82 return -1; /* not valid pin */
83
84 if (pin < S3C2410_GPF4)
85 return (pin - S3C2410_GPF0) + IRQ_EINT0;
86
87 if (pin < S3C2410_GPG0)
88 return (pin - S3C2410_GPF4) + IRQ_EINT4;
89
90 return (pin - S3C2410_GPG0) + IRQ_EINT8;
91}
92
93EXPORT_SYMBOL(s3c2410_gpio_getirq);