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

   1 /*
   2  * Copyright (C) 2007 OpenWrt.org
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #ifndef __AR7_GPIO_H__
  20 #define __AR7_GPIO_H__
  21 #include <asm/ar7/ar7.h>
  22
  23 #define AR7_GPIO_MAX 32
  24
  25 extern int gpio_request(unsigned gpio, const char *label);
  26 extern void gpio_free(unsigned gpio);
  27
  28 /* Common GPIO layer */
  29 static inline int gpio_get_value(unsigned gpio)
  30 {
  31         void __iomem *gpio_in =
  32                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_INPUT);
  33
  34         if (gpio >= AR7_GPIO_MAX)
  35                 return -EINVAL;
  36
  37         return ((readl(gpio_in) & (1 << gpio)) != 0);
  38 }
  39
  40 static inline void gpio_set_value(unsigned gpio, int value)
  41 {
  42         void __iomem *gpio_out =
  43                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_OUTPUT);
  44         volatile unsigned tmp;
  45
  46         if (gpio >= AR7_GPIO_MAX)
  47                 return;
  48
  49         tmp = readl(gpio_out) & ~(1 << gpio);
  50         if (value)
  51                 tmp |= 1 << gpio;
  52         writel(tmp, gpio_out);
  53 }
  54
  55 static inline int gpio_direction_input(unsigned gpio)
  56 {
  57         void __iomem *gpio_dir =
  58                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
  59
  60         if (gpio >= AR7_GPIO_MAX)
  61                 return -EINVAL;
  62
  63         writel(readl(gpio_dir) | (1 << gpio), gpio_dir);
  64
  65         return 0;
  66 }
  67
  68 static inline int gpio_direction_output(unsigned gpio, int value)
  69 {
  70         void __iomem *gpio_dir =
  71                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
  72
  73         if (gpio >= AR7_GPIO_MAX)
  74                 return -EINVAL;
  75
  76         gpio_set_value(gpio, value);
  77         writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
  78
  79         return 0;
  80 }
  81
  82 static inline int gpio_to_irq(unsigned gpio)
  83 {
  84         return -EINVAL;
  85 }
  86
  87 static inline int irq_to_gpio(unsigned irq)
  88 {
  89         return -EINVAL;
  90 }
  91
  92 /* Board specific GPIO functions */
  93 static inline int ar7_gpio_enable(unsigned gpio)
  94 {
  95         void __iomem *gpio_en =
  96                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
  97
  98         if (gpio >= AR7_GPIO_MAX)
  99                 return -EINVAL;
 100
 101         writel(readl(gpio_en) | (1 << gpio), gpio_en);
 102
 103         return 0;
 104 }
 105
 106 static inline int ar7_gpio_disable(unsigned gpio)
 107 {
 108         void __iomem *gpio_en =
 109                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
 110
 111         if (gpio >= AR7_GPIO_MAX)
 112                 return -EINVAL;
 113
 114         writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
 115
 116         return 0;
 117 }
 118
 119 #include <asm-generic/gpio.h>
 120
 121 #endif