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         static unsigned addr;
  32
  33         if (!addr) {
  34                 void __iomem *gpio_in = (void __iomem *)
  35                                 KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_INPUT);
  36                 addr = readl(gpio_in);
  37         }
  38
  39         return addr & (1 << gpio);
  40 }
  41
  42 static inline void gpio_set_value(unsigned gpio, int value)
  43 {
  44         static void __iomem *gpio_out;
  45         unsigned tmp;
  46
  47         if (!gpio_out)
  48                 gpio_out = (void __iomem *)
  49                                 KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_OUTPUT);
  50
  51         tmp = readl(gpio_out) & ~(1 << gpio);
  52         if (value)
  53                 tmp |= 1 << gpio;
  54         writel(tmp, gpio_out);
  55 }
  56
  57 static inline int gpio_direction_input(unsigned gpio)
  58 {
  59         void __iomem *gpio_dir =
  60                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
  61
  62         if (gpio >= AR7_GPIO_MAX)
  63                 return -EINVAL;
  64
  65         writel(readl(gpio_dir) | (1 << gpio), gpio_dir);
  66
  67         return 0;
  68 }
  69
  70 static inline int gpio_direction_output(unsigned gpio, int value)
  71 {
  72         void __iomem *gpio_dir =
  73                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_DIR);
  74
  75         if (gpio >= AR7_GPIO_MAX)
  76                 return -EINVAL;
  77
  78         gpio_set_value(gpio, value);
  79         writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
  80
  81         return 0;
  82 }
  83
  84 static inline int gpio_to_irq(unsigned gpio)
  85 {
  86         return -EINVAL;
  87 }
  88
  89 static inline int irq_to_gpio(unsigned irq)
  90 {
  91         return -EINVAL;
  92 }
  93
  94 /* Board specific GPIO functions */
  95 static inline int ar7_gpio_enable(unsigned gpio)
  96 {
  97         void __iomem *gpio_en =
  98                 (void __iomem *)KSEG1ADDR(AR7_REGS_GPIO + AR7_GPIO_ENABLE);
  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         writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
 111
 112         return 0;
 113 }
 114
 115 #include <asm-generic/gpio.h>
 116
 117 #endif