1 /* linux/arch/arm/mach-s3c2410/gpio.c
3 * Copyright (c) 2004-2005 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
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.
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.
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
23 * 13-Sep-2004 BJD Implemented change of MISCCR
24 * 14-Sep-2004 BJD Added getpin call
25 * 14-Sep-2004 BJD Fixed bug in setpin() call
26 * 30-Sep-2004 BJD Fixed cfgpin() mask bug
27 * 01-Oct-2004 BJD Added getcfg() to get pin configuration
28 * 01-Oct-2004 BJD Fixed mask bug in pullup() call
29 * 01-Oct-2004 BJD Added getirq() to turn pin into irqno
30 * 04-Oct-2004 BJD Added irq filter controls for GPIO
31 * 05-Nov-2004 BJD EXPORT_SYMBOL() added for all code
32 * 13-Mar-2005 BJD Updates for __iomem
33 * 26-Oct-2005 BJD Added generic configuration types
34 * 15-Jan-2006 LCVR Added support for the S3C2400
38 #include <linux/kernel.h>
39 #include <linux/init.h>
40 #include <linux/module.h>
41 #include <linux/interrupt.h>
42 #include <linux/ioport.h>
44 #include <asm/hardware.h>
48 #include <asm/arch/regs-gpio.h>
50 void s3c2410_gpio_cfgpin(unsigned int pin, unsigned int function)
52 void __iomem *base = S3C24XX_GPIO_BASE(pin);
57 if (pin < S3C2410_GPIO_BANKB) {
58 mask = 1 << S3C2410_GPIO_OFFSET(pin);
60 mask = 3 << S3C2410_GPIO_OFFSET(pin)*2;
64 case S3C2410_GPIO_LEAVE:
69 case S3C2410_GPIO_INPUT:
70 case S3C2410_GPIO_OUTPUT:
71 case S3C2410_GPIO_SFN2:
72 case S3C2410_GPIO_SFN3:
73 if (pin < S3C2410_GPIO_BANKB) {
75 function <<= S3C2410_GPIO_OFFSET(pin);
78 function <<= S3C2410_GPIO_OFFSET(pin)*2;
82 /* modify the specified register wwith IRQs off */
84 local_irq_save(flags);
86 con = __raw_readl(base + 0x00);
90 __raw_writel(con, base + 0x00);
92 local_irq_restore(flags);
95 EXPORT_SYMBOL(s3c2410_gpio_cfgpin);
97 unsigned int s3c2410_gpio_getcfg(unsigned int pin)
99 void __iomem *base = S3C24XX_GPIO_BASE(pin);
102 if (pin < S3C2410_GPIO_BANKB) {
103 mask = 1 << S3C2410_GPIO_OFFSET(pin);
105 mask = 3 << S3C2410_GPIO_OFFSET(pin)*2;
108 return __raw_readl(base) & mask;
111 EXPORT_SYMBOL(s3c2410_gpio_getcfg);
113 void s3c2410_gpio_pullup(unsigned int pin, unsigned int to)
115 void __iomem *base = S3C24XX_GPIO_BASE(pin);
116 unsigned long offs = S3C2410_GPIO_OFFSET(pin);
120 if (pin < S3C2410_GPIO_BANKB)
123 local_irq_save(flags);
125 up = __raw_readl(base + 0x08);
128 __raw_writel(up, base + 0x08);
130 local_irq_restore(flags);
133 EXPORT_SYMBOL(s3c2410_gpio_pullup);
135 void s3c2410_gpio_setpin(unsigned int pin, unsigned int to)
137 void __iomem *base = S3C24XX_GPIO_BASE(pin);
138 unsigned long offs = S3C2410_GPIO_OFFSET(pin);
142 local_irq_save(flags);
144 dat = __raw_readl(base + 0x04);
147 __raw_writel(dat, base + 0x04);
149 local_irq_restore(flags);
152 EXPORT_SYMBOL(s3c2410_gpio_setpin);
154 unsigned int s3c2410_gpio_getpin(unsigned int pin)
156 void __iomem *base = S3C24XX_GPIO_BASE(pin);
157 unsigned long offs = S3C2410_GPIO_OFFSET(pin);
159 return __raw_readl(base + 0x04) & (1<< offs);
162 EXPORT_SYMBOL(s3c2410_gpio_getpin);
164 unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)
167 unsigned long misccr;
169 local_irq_save(flags);
170 misccr = __raw_readl(S3C24XX_MISCCR);
173 __raw_writel(misccr, S3C24XX_MISCCR);
174 local_irq_restore(flags);
179 EXPORT_SYMBOL(s3c2410_modify_misccr);