arch/arm/mach-s3c2410/gpio.c

   1 /* linux/arch/arm/mach-s3c2410/gpio.c
   2  *
   3  * Copyright (c) 2004 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  *      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  */
  32
  33
  34 #include <linux/init.h>
  35 #include <linux/module.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/ioport.h>
  38
  39 #include <asm/hardware.h>
  40 #include <asm/irq.h>
  41 #include <asm/io.h>
  42
  43 #include <asm/arch/regs-gpio.h>
  44
  45 void s3c2410_gpio_cfgpin(unsigned int pin, unsigned int function)
  46 {
  47         unsigned long base = S3C2410_GPIO_BASE(pin);
  48         unsigned long mask;
  49         unsigned long con;
  50         unsigned long flags;
  51
  52         if (pin < S3C2410_GPIO_BANKB) {
  53                 mask = 1 << S3C2410_GPIO_OFFSET(pin);
  54         } else {
  55                 mask = 3 << S3C2410_GPIO_OFFSET(pin)*2;
  56         }
  57
  58         local_irq_save(flags);
  59
  60         con  = __raw_readl(base + 0x00);
  61         con &= ~mask;
  62         con |= function;
  63
  64         __raw_writel(con, base + 0x00);
  65
  66         local_irq_restore(flags);
  67 }
  68
  69 unsigned int s3c2410_gpio_getcfg(unsigned int pin)
  70 {
  71         unsigned long base = S3C2410_GPIO_BASE(pin);
  72         unsigned long mask;
  73
  74         if (pin < S3C2410_GPIO_BANKB) {
  75                 mask = 1 << S3C2410_GPIO_OFFSET(pin);
  76         } else {
  77                 mask = 3 << S3C2410_GPIO_OFFSET(pin)*2;
  78         }
  79
  80         return __raw_readl(base) & mask;
  81 }
  82
  83 void s3c2410_gpio_pullup(unsigned int pin, unsigned int to)
  84 {
  85         unsigned long base = S3C2410_GPIO_BASE(pin);
  86         unsigned long offs = S3C2410_GPIO_OFFSET(pin);
  87         unsigned long flags;
  88         unsigned long up;
  89
  90         if (pin < S3C2410_GPIO_BANKB)
  91                 return;
  92
  93         local_irq_save(flags);
  94
  95         up = __raw_readl(base + 0x08);
  96         up &= ~(1L << offs);
  97         up |= to << offs;
  98         __raw_writel(up, base + 0x08);
  99
 100         local_irq_restore(flags);
 101 }
 102
 103 void s3c2410_gpio_setpin(unsigned int pin, unsigned int to)
 104 {
 105         unsigned long base = S3C2410_GPIO_BASE(pin);
 106         unsigned long offs = S3C2410_GPIO_OFFSET(pin);
 107         unsigned long flags;
 108         unsigned long dat;
 109
 110         local_irq_save(flags);
 111
 112         dat = __raw_readl(base + 0x04);
 113         dat &= ~(1 << offs);
 114         dat |= to << offs;
 115         __raw_writel(dat, base + 0x04);
 116
 117         local_irq_restore(flags);
 118 }
 119
 120 unsigned int s3c2410_gpio_getpin(unsigned int pin)
 121 {
 122         unsigned long base = S3C2410_GPIO_BASE(pin);
 123         unsigned long offs = S3C2410_GPIO_OFFSET(pin);
 124
 125         return __raw_readl(base + 0x04) & (1<< offs);
 126 }
 127
 128 unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)
 129 {
 130         unsigned long flags;
 131         unsigned long misccr;
 132
 133         local_irq_save(flags);
 134         misccr = __raw_readl(S3C2410_MISCCR);
 135         misccr &= ~clear;
 136         misccr ^= change;
 137         __raw_writel(misccr, S3C2410_MISCCR);
 138         local_irq_restore(flags);
 139
 140         return misccr;
 141 }
 142
 143 int s3c2410_gpio_getirq(unsigned int pin)
 144 {
 145         if (pin < S3C2410_GPF0 || pin > S3C2410_GPG15_EINT23)
 146                 return -1;      /* not valid interrupts */
 147
 148         if (pin < S3C2410_GPG0 && pin > S3C2410_GPF7)
 149                 return -1;      /* not valid pin */
 150
 151         if (pin < S3C2410_GPF4)
 152                 return (pin - S3C2410_GPF0) + IRQ_EINT0;
 153
 154         if (pin < S3C2410_GPG0)
 155                 return (pin - S3C2410_GPF4) + IRQ_EINT4;
 156
 157         return (pin - S3C2410_GPG0) + IRQ_EINT8;
 158 }
 159
 160 int s3c2410_gpio_irqfilter(unsigned int pin, unsigned int on,
 161                            unsigned int config)
 162 {
 163         unsigned long reg = S3C2410_EINFLT0;
 164         unsigned long flags;
 165         unsigned long val;
 166
 167         if (pin < S3C2410_GPG8 || pin > S3C2410_GPG15)
 168                 return -1;
 169
 170         config &= 0xff;
 171
 172         pin -= S3C2410_GPG8_EINT16;
 173         reg += pin & ~3;
 174
 175         local_irq_save(flags);
 176
 177         /* update filter width and clock source */
 178
 179         val = __raw_readl(reg);
 180         val &= ~(0xff << ((pin & 3) * 8));
 181         val |= config << ((pin & 3) * 8);
 182         __raw_writel(val, reg);
 183
 184         /* update filter enable */
 185
 186         val = __raw_readl(S3C2410_EXTINT2);
 187         val &= ~(1 << ((pin * 4) + 3));
 188         val |= on << ((pin * 4) + 3);
 189         __raw_writel(val, S3C2410_EXTINT2);
 190
 191         local_irq_restore(flags);
 192
 193         return 0;
 194 }