target/linux/ar7/files/include/asm-mips/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 #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         return readl(gpio_in) & (1 << gpio);
  35 }
  36
  37 static inline void gpio_set_value(unsigned gpio, int value)
  38 {
  39         void __iomem *gpio_out =
  40                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_OUTPUT);
  41         unsigned tmp;
  42
  43         tmp = readl(gpio_out) & ~(1 << gpio);
  44         if (value)
  45                 tmp |= 1 << gpio;
  46         writel(tmp, gpio_out);
  47 }
  48
  49 static inline int gpio_direction_input(unsigned gpio)
  50 {
  51         void __iomem *gpio_dir =
  52                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
  53
  54         if (gpio >= AR7_GPIO_MAX)
  55                 return -EINVAL;
  56
  57         writel(readl(gpio_dir) | (1 << gpio), gpio_dir);
  58
  59         return 0;
  60 }
  61
  62 static inline int gpio_direction_output(unsigned gpio, int value)
  63 {
  64         void __iomem *gpio_dir =
  65                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
  66
  67         if (gpio >= AR7_GPIO_MAX)
  68                 return -EINVAL;
  69
  70         gpio_set_value(gpio, value);
  71         writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
  72
  73         return 0;
  74 }
  75
  76 static inline int gpio_to_irq(unsigned gpio)
  77 {
  78         return -EINVAL;
  79 }
  80
  81 static inline int irq_to_gpio(unsigned irq)
  82 {
  83         return -EINVAL;
  84 }
  85
  86 /* Board specific GPIO functions */
  87 static inline int ar7_gpio_enable(unsigned gpio)
  88 {
  89         void __iomem *gpio_en =
  90                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
  91
  92         writel(readl(gpio_en) | (1 << gpio), gpio_en);
  93
  94         return 0;
  95 }
  96
  97 static inline int ar7_gpio_disable(unsigned gpio)
  98 {
  99         void __iomem *gpio_en =
 100                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
 101
 102         writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
 103
 104         return 0;
 105 }
 106
 107 #include <asm-generic/gpio.h>
 108
 109 #endif