1/* linux/arch/arm/plat-s3c24xx/gpio.c 2 * 3 * Copyright (c) 2004-2005 Simtec Electronics 4 * Ben Dooks <ben@simtec.co.uk> 5 * 6 * S3C24XX 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 24#include <linux/kernel.h> 25#include <linux/init.h> 26#include <linux/module.h> 27#include <linux/interrupt.h> 28#include <linux/ioport.h> 29 30#include <asm/hardware.h> 31#include <asm/irq.h> 32#include <asm/io.h> 33 34#include <asm/arch/regs-gpio.h> 35 36void s3c2410_gpio_cfgpin(unsigned int pin, unsigned int function) 37{ 38 void __iomem *base = S3C24XX_GPIO_BASE(pin); 39 unsigned long mask; 40 unsigned long con; 41 unsigned long flags; 42 43 if (pin < S3C2410_GPIO_BANKB) { 44 mask = 1 << S3C2410_GPIO_OFFSET(pin); 45 } else { 46 mask = 3 << S3C2410_GPIO_OFFSET(pin)*2; 47 } 48 49 switch (function) { 50 case S3C2410_GPIO_LEAVE: 51 mask = 0; 52 function = 0; 53 break; 54 55 case S3C2410_GPIO_INPUT: 56 case S3C2410_GPIO_OUTPUT: 57 case S3C2410_GPIO_SFN2: 58 case S3C2410_GPIO_SFN3: 59 if (pin < S3C2410_GPIO_BANKB) { 60 function -= 1; 61 function &= 1; 62 function <<= S3C2410_GPIO_OFFSET(pin); 63 } else { 64 function &= 3; 65 function <<= S3C2410_GPIO_OFFSET(pin)*2; 66 } 67 } 68 69 /* modify the specified register wwith IRQs off */ 70 71 local_irq_save(flags); 72 73 con = __raw_readl(base + 0x00); 74 con &= ~mask; 75 con |= function; 76 77 __raw_writel(con, base + 0x00); 78 79 local_irq_restore(flags); 80} 81 82EXPORT_SYMBOL(s3c2410_gpio_cfgpin); 83 84unsigned int s3c2410_gpio_getcfg(unsigned int pin) 85{ 86 void __iomem *base = S3C24XX_GPIO_BASE(pin); 87 unsigned long val = __raw_readl(base); 88 89 if (pin < S3C2410_GPIO_BANKB) { 90 val >>= S3C2410_GPIO_OFFSET(pin); 91 val &= 1; 92 val += 1; 93 } else { 94 val >>= S3C2410_GPIO_OFFSET(pin)*2; 95 val &= 3; 96 } 97 98 return val | S3C2410_GPIO_INPUT; 99} 100 101EXPORT_SYMBOL(s3c2410_gpio_getcfg); 102 103void s3c2410_gpio_pullup(unsigned int pin, unsigned int to) 104{ 105 void __iomem *base = S3C24XX_GPIO_BASE(pin); 106 unsigned long offs = S3C2410_GPIO_OFFSET(pin); 107 unsigned long flags; 108 unsigned long up; 109 110 if (pin < S3C2410_GPIO_BANKB) 111 return; 112 113 local_irq_save(flags); 114 115 up = __raw_readl(base + 0x08); 116 up &= ~(1L << offs); 117 up |= to << offs; 118 __raw_writel(up, base + 0x08); 119 120 local_irq_restore(flags); 121} 122 123EXPORT_SYMBOL(s3c2410_gpio_pullup); 124 125void s3c2410_gpio_setpin(unsigned int pin, unsigned int to) 126{ 127 void __iomem *base = S3C24XX_GPIO_BASE(pin); 128 unsigned long offs = S3C2410_GPIO_OFFSET(pin); 129 unsigned long flags; 130 unsigned long dat; 131 132 local_irq_save(flags); 133 134 dat = __raw_readl(base + 0x04); 135 dat &= ~(1 << offs); 136 dat |= to << offs; 137 __raw_writel(dat, base + 0x04); 138 139 local_irq_restore(flags); 140} 141 142EXPORT_SYMBOL(s3c2410_gpio_setpin); 143 144unsigned int s3c2410_gpio_getpin(unsigned int pin) 145{ 146 void __iomem *base = S3C24XX_GPIO_BASE(pin); 147 unsigned long offs = S3C2410_GPIO_OFFSET(pin); 148 149 return __raw_readl(base + 0x04) & (1<< offs); 150} 151 152EXPORT_SYMBOL(s3c2410_gpio_getpin); 153 154unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change) 155{ 156 unsigned long flags; 157 unsigned long misccr; 158 159 local_irq_save(flags); 160 misccr = __raw_readl(S3C24XX_MISCCR); 161 misccr &= ~clear; 162 misccr ^= change; 163 __raw_writel(misccr, S3C24XX_MISCCR); 164 local_irq_restore(flags); 165 166 return misccr; 167} 168 169EXPORT_SYMBOL(s3c2410_modify_misccr); 170 171int s3c2410_gpio_getirq(unsigned int pin) 172{ 173 if (pin < S3C2410_GPF0 || pin > S3C2410_GPG15) 174 return -1; /* not valid interrupts */ 175 176 if (pin < S3C2410_GPG0 && pin > S3C2410_GPF7) 177 return -1; /* not valid pin */ 178 179 if (pin < S3C2410_GPF4) 180 return (pin - S3C2410_GPF0) + IRQ_EINT0; 181 182 if (pin < S3C2410_GPG0) 183 return (pin - S3C2410_GPF4) + IRQ_EINT4; 184 185 return (pin - S3C2410_GPG0) + IRQ_EINT8; 186} 187 188EXPORT_SYMBOL(s3c2410_gpio_getirq); 189