firmware/target/arm/imx31/gpio-imx31.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (c) 2008 by Michael Sevakis
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #ifndef GPIO_IMX31_H
  22 #define GPIO_IMX31_H
  23
  24 /* Static registration mechanism for imx31 GPIO interrupts */
  25 #define USE_GPIO1_EVENTS (1 << 0)
  26 #define USE_GPIO2_EVENTS (1 << 1)
  27 #define USE_GPIO3_EVENTS (1 << 2)
  28
  29 /* Module indexes defined by which GPIO modules are used */
  30 enum gpio_module_number
  31 {
  32     __GPIO_NUM_START = -1,
  33 #if (GPIO_EVENT_MASK & USE_GPIO1_EVENTS)
  34     GPIO1_NUM,
  35 #endif
  36 #if (GPIO_EVENT_MASK & USE_GPIO2_EVENTS)
  37     GPIO2_NUM,
  38 #endif
  39 #if (GPIO_EVENT_MASK & USE_GPIO3_EVENTS)
  40     GPIO3_NUM,
  41 #endif
  42     GPIO_NUM_GPIO,
  43 };
  44
  45 /* Possible values for gpio interrupt line config */
  46 enum gpio_int_sense_enum
  47 {
  48     GPIO_SENSE_LOW_LEVEL = 0, /* High-level sensitive */
  49     GPIO_SENSE_HIGH_LEVEL,    /* Low-level sensitive */
  50     GPIO_SENSE_RISING,        /* Rising-edge sensitive */
  51     GPIO_SENSE_FALLING,       /* Falling-edge sensitive */
  52 };
  53
  54 #define GPIO_SENSE_CONFIG_MASK 0x3
  55
  56 /* Pending events will be called in array order which allows easy
  57  * pioritization */
  58
  59 /* Describes a single event for a pin */
  60 struct gpio_event
  61 {
  62     unsigned long mask;             /* mask: 1 << (0...31) */
  63     enum gpio_int_sense_enum sense; /* Type of sense */
  64     void (*callback)(void);         /* Callback function */
  65 };
  66
  67 /* Module corresponding to the event ID is identified by range */
  68 enum gpio_event_bases
  69 {
  70 #if (GPIO_EVENT_MASK & USE_GPIO1_EVENTS)
  71     GPIO1_EVENT_FIRST = 32*GPIO1_NUM,
  72 #endif
  73 #if (GPIO_EVENT_MASK & USE_GPIO2_EVENTS)
  74     GPIO2_EVENT_FIRST = 32*GPIO2_NUM,
  75 #endif
  76 #if (GPIO_EVENT_MASK & USE_GPIO3_EVENTS)
  77     GPIO3_EVENT_FIRST = 32*GPIO3_NUM,
  78 #endif
  79 };
  80
  81 #include "gpio-target.h"
  82
  83 void gpio_init(void);
  84 bool gpio_enable_event(enum gpio_event_ids id);
  85 void gpio_disable_event(enum gpio_event_ids id);
  86
  87 #endif /* GPIO_IMX31_H */