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, char *label);
  26 extern void gpio_free(unsigned gpio);
  27
  28 /* Common GPIO layer */
  29 static inline int gpio_direction_input(unsigned gpio)
  30 {
  31         void __iomem *gpio_dir =
  32                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
  33
  34         if (gpio >= AR7_GPIO_MAX)
  35                 return -EINVAL;
  36
  37         writel(readl(gpio_dir) | (1 << gpio), gpio_dir);
  38
  39         return 0;
  40 }
  41
  42 static inline int gpio_direction_output(unsigned gpio)
  43 {
  44         void __iomem *gpio_dir =
  45                 (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 =
  58                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_INPUT);
  59
  60         if (gpio >= AR7_GPIO_MAX)
  61                 return -EINVAL;
  62
  63         return ((readl(gpio_in) & (1 << gpio)) != 0);
  64 }
  65
  66 static inline void gpio_set_value(unsigned gpio, int value)
  67 {
  68         void __iomem *gpio_out =
  69                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_OUTPUT);
  70         volatile unsigned tmp;
  71
  72         if (gpio >= AR7_GPIO_MAX)
  73                 return;
  74
  75         tmp = readl(gpio_out) & ~(1 << gpio);
  76         if (value)
  77                 tmp |= 1 << gpio;
  78         writel(tmp, gpio_out);
  79 }
  80
  81 static inline int gpio_to_irq(unsigned gpio)
  82 {
  83         return -EINVAL;
  84 }
  85
  86 static inline int irq_to_gpio(unsigned irq)
  87 {
  88         return -EINVAL;
  89 }
  90
  91 /* Board specific GPIO functions */
  92 static inline int ar7_gpio_enable(unsigned gpio)
  93 {
  94         void __iomem *gpio_en =
  95                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
  96
  97         if (gpio >= AR7_GPIO_MAX)
  98                 return -EINVAL;
  99
 100         writel(readl(gpio_en) | (1 << gpio), gpio_en);
 101
 102         return 0;
 103 }
 104
 105 static inline int ar7_gpio_disable(unsigned gpio)
 106 {
 107         void __iomem *gpio_en =
 108                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
 109
 110         if (gpio >= AR7_GPIO_MAX)
 111                 return -EINVAL;
 112
 113         writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
 114
 115         return 0;
 116 }
 117
 118 #include <asm-generic/gpio.h>
 119
 120 #endif