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
37 #include <linux/kernel.h>
38 #include <linux/init.h>
39 #include <linux/module.h>
40 #include <linux/interrupt.h>
41 #include <linux/ioport.h>
43 #include <asm/hardware.h>
47 #include <asm/arch/regs-gpio.h>
49 void s3c2410_gpio_cfgpin(unsigned int pin, unsigned int function)
51 void __iomem *base = S3C2410_GPIO_BASE(pin);
56 if (pin < S3C2410_GPIO_BANKB) {
57 mask = 1 << S3C2410_GPIO_OFFSET(pin);
59 mask = 3 << S3C2410_GPIO_OFFSET(pin)*2;
63 case S3C2410_GPIO_LEAVE:
68 case S3C2410_GPIO_INPUT:
69 case S3C2410_GPIO_OUTPUT:
70 case S3C2410_GPIO_SFN2:
71 case S3C2410_GPIO_SFN3:
72 if (pin < S3C2410_GPIO_BANKB) {
74 function <<= S3C2410_GPIO_OFFSET(pin);
77 function <<= S3C2410_GPIO_OFFSET(pin)*2;
81 /* modify the specified register wwith IRQs off */
83 local_irq_save(flags);
85 con = __raw_readl(base + 0x00);
89 __raw_writel(con, base + 0x00);
91 local_irq_restore(flags);
94 EXPORT_SYMBOL(s3c2410_gpio_cfgpin);
96 unsigned int s3c2410_gpio_getcfg(unsigned int pin)
98 void __iomem *base = S3C2410_GPIO_BASE(pin);
101 if (pin < S3C2410_GPIO_BANKB) {
102 mask = 1 << S3C2410_GPIO_OFFSET(pin);
104 mask = 3 << S3C2410_GPIO_OFFSET(pin)*2;
107 return __raw_readl(base) & mask;
110 EXPORT_SYMBOL(s3c2410_gpio_getcfg);
112 void s3c2410_gpio_pullup(unsigned int pin, unsigned int to)
114 void __iomem *base = S3C2410_GPIO_BASE(pin);
115 unsigned long offs = S3C2410_GPIO_OFFSET(pin);
119 if (pin < S3C2410_GPIO_BANKB)
122 local_irq_save(flags);
124 up = __raw_readl(base + 0x08);
127 __raw_writel(up, base + 0x08);
129 local_irq_restore(flags);
132 EXPORT_SYMBOL(s3c2410_gpio_pullup);
134 void s3c2410_gpio_setpin(unsigned int pin, unsigned int to)
136 void __iomem *base = S3C2410_GPIO_BASE(pin);
137 unsigned long offs = S3C2410_GPIO_OFFSET(pin);
141 local_irq_save(flags);
143 dat = __raw_readl(base + 0x04);
146 __raw_writel(dat, base + 0x04);
148 local_irq_restore(flags);
151 EXPORT_SYMBOL(s3c2410_gpio_setpin);
153 unsigned int s3c2410_gpio_getpin(unsigned int pin)
155 void __iomem *base = S3C2410_GPIO_BASE(pin);
156 unsigned long offs = S3C2410_GPIO_OFFSET(pin);
158 return __raw_readl(base + 0x04) & (1<< offs);
161 EXPORT_SYMBOL(s3c2410_gpio_getpin);
163 unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)
166 unsigned long misccr;
168 local_irq_save(flags);
169 misccr = __raw_readl(S3C2410_MISCCR);
172 __raw_writel(misccr, S3C2410_MISCCR);
173 local_irq_restore(flags);
178 EXPORT_SYMBOL(s3c2410_modify_misccr);
180 int s3c2410_gpio_getirq(unsigned int pin)
182 if (pin < S3C2410_GPF0 || pin > S3C2410_GPG15_EINT23)
183 return -1; /* not valid interrupts */
185 if (pin < S3C2410_GPG0 && pin > S3C2410_GPF7)
186 return -1; /* not valid pin */
188 if (pin < S3C2410_GPF4)
189 return (pin - S3C2410_GPF0) + IRQ_EINT0;
191 if (pin < S3C2410_GPG0)
192 return (pin - S3C2410_GPF4) + IRQ_EINT4;
194 return (pin - S3C2410_GPG0) + IRQ_EINT8;
197 EXPORT_SYMBOL(s3c2410_gpio_getirq);
199 int s3c2410_gpio_irqfilter(unsigned int pin, unsigned int on,
202 void __iomem *reg = S3C2410_EINFLT0;
206 if (pin < S3C2410_GPG8 || pin > S3C2410_GPG15)
211 pin -= S3C2410_GPG8_EINT16;
214 local_irq_save(flags);
216 /* update filter width and clock source */
218 val = __raw_readl(reg);
219 val &= ~(0xff << ((pin & 3) * 8));
220 val |= config << ((pin & 3) * 8);
221 __raw_writel(val, reg);
223 /* update filter enable */
225 val = __raw_readl(S3C2410_EXTINT2);
226 val &= ~(1 << ((pin * 4) + 3));
227 val |= on << ((pin * 4) + 3);
228 __raw_writel(val, S3C2410_EXTINT2);
230 local_irq_restore(flags);
235 EXPORT_SYMBOL(s3c2410_gpio_irqfilter);