target/linux/ar7-2.6/files/include/asm-mips/ar7/gpio.h

   1 /*
   2  * $Id$
   3  *
   4  * Copyright (C) 2007 OpenWrt.org
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21 #ifndef __AR7_GPIO_H__
  22 #define __AR7_GPIO_H__
  23 #include <asm/ar7/ar7.h>
  24
  25 #define AR7_GPIO_MAX 32
  26
  27 extern int gpio_request(unsigned gpio, char *label);
  28 extern void gpio_free(unsigned gpio);
  29
  30 /* Common GPIO layer */
  31 static inline int gpio_direction_input(unsigned gpio)
  32 {
  33         void __iomem *gpio_dir = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
  34
  35         if (gpio >= AR7_GPIO_MAX)
  36                 return -EINVAL;
  37
  38         writel(readl(gpio_dir) | (1 << gpio), gpio_dir);
  39
  40         return 0;
  41 }
  42
  43 static inline int gpio_direction_output(unsigned gpio)
  44 {
  45         void __iomem *gpio_dir = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
  46
  47         if (gpio >= AR7_GPIO_MAX)
  48                 return -EINVAL;
  49
  50         writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
  51
  52         return 0;
  53 }
  54
  55 static inline int gpio_get_value(unsigned gpio)
  56 {
  57         void __iomem *gpio_in = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_INPUT);
  58
  59         if (gpio >= AR7_GPIO_MAX)
  60                 return -EINVAL;
  61
  62         return ((readl(gpio_in) & (1 << gpio)) != 0);
  63 }
  64
  65 static inline void gpio_set_value(unsigned gpio, int value)
  66 {
  67         void __iomem *gpio_out = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_OUTPUT);
  68         volatile unsigned tmp;
  69
  70         if (gpio >= AR7_GPIO_MAX)
  71                 return;
  72
  73         tmp = readl(gpio_out) & ~(1 << gpio);
  74         if (value)
  75                 tmp |= 1 << gpio;
  76         writel(tmp, gpio_out);
  77 }
  78
  79 static inline int gpio_to_irq(unsigned gpio)
  80 {
  81         return -EINVAL;
  82 }
  83
  84 static inline int irq_to_gpio(unsigned irq)
  85 {
  86         return -EINVAL;
  87 }
  88
  89 /* Board specific GPIO functions */
  90 static inline int ar7_gpio_enable(unsigned gpio)
  91 {
  92         void __iomem *gpio_en = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
  93
  94         if (gpio >= AR7_GPIO_MAX)
  95                 return -EINVAL;
  96
  97         writel(readl(gpio_en) | (1 << gpio), gpio_en);
  98
  99         return 0;
 100 }
 101
 102 static inline int ar7_gpio_disable(unsigned gpio)
 103 {
 104         void __iomem *gpio_en = (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
 105
 106         if (gpio >= AR7_GPIO_MAX)
 107                 return -EINVAL;
 108
 109         writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
 110
 111         return 0;
 112 }
 113
 114 #include <asm-generic/gpio.h>
 115
 116 #endif