arch/mips/include/asm/mach-ar7/gpio.h

   1 /*
   2  * Copyright (C) 2007 Florian Fainelli <florian@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
  22 #include <asm/mach-ar7/ar7.h>
  23
  24 #define AR7_GPIO_MAX 32
  25
  26 extern int gpio_request(unsigned gpio, const char *label);
  27 extern void gpio_free(unsigned gpio);
  28
  29 /* Common GPIO layer */
  30 static inline int gpio_get_value(unsigned gpio)
  31 {
  32         void __iomem *gpio_in =
  33                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_INPUT);
  34
  35         return readl(gpio_in) & (1 << gpio);
  36 }
  37
  38 static inline void gpio_set_value(unsigned gpio, int value)
  39 {
  40         void __iomem *gpio_out =
  41                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_OUTPUT);
  42         unsigned tmp;
  43
  44         tmp = readl(gpio_out) & ~(1 << gpio);
  45         if (value)
  46                 tmp |= 1 << gpio;
  47         writel(tmp, gpio_out);
  48 }
  49
  50 static inline int gpio_direction_input(unsigned gpio)
  51 {
  52         void __iomem *gpio_dir =
  53                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
  54
  55         if (gpio >= AR7_GPIO_MAX)
  56                 return -EINVAL;
  57
  58         writel(readl(gpio_dir) | (1 << gpio), gpio_dir);
  59
  60         return 0;
  61 }
  62
  63 static inline int gpio_direction_output(unsigned gpio, int value)
  64 {
  65         void __iomem *gpio_dir =
  66                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
  67
  68         if (gpio >= AR7_GPIO_MAX)
  69                 return -EINVAL;
  70
  71         gpio_set_value(gpio, value);
  72         writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
  73
  74         return 0;
  75 }
  76
  77 static inline int gpio_to_irq(unsigned gpio)
  78 {
  79         return -EINVAL;
  80 }
  81
  82 static inline int irq_to_gpio(unsigned irq)
  83 {
  84         return -EINVAL;
  85 }
  86
  87 /* Board specific GPIO functions */
  88 static inline int ar7_gpio_enable(unsigned gpio)
  89 {
  90         void __iomem *gpio_en =
  91                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
  92
  93         writel(readl(gpio_en) | (1 << gpio), gpio_en);
  94
  95         return 0;
  96 }
  97
  98 static inline int ar7_gpio_disable(unsigned gpio)
  99 {
 100         void __iomem *gpio_en =
 101                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
 102
 103         writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
 104
 105         return 0;
 106 }
 107
 108 #include <asm-generic/gpio.h>
 109
 110 #endif