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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (c) 2008 by Michael Sevakis
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef GPIO_IMX31_H
#define GPIO_IMX31_H
#include "gpio-target.h"
#define USE_GPIO1_EVENTS (1 << 0)
#define USE_GPIO2_EVENTS (1 << 1)
#define USE_GPIO3_EVENTS (1 << 2)
enum gpio_module_number
{
__GPIO_NUM_START = -1,
#if (GPIO_EVENT_MASK & USE_GPIO1_EVENTS)
GPIO1_NUM,
#endif
#if (GPIO_EVENT_MASK & USE_GPIO2_EVENTS)
GPIO2_NUM,
#endif
#if (GPIO_EVENT_MASK & USE_GPIO3_EVENTS)
GPIO3_NUM,
#endif
GPIO_NUM_GPIO,
};
/* Possible values for gpio interrupt line config */
enum gpio_int_sense_enum
{
GPIO_SENSE_LOW_LEVEL = 0, /* High-level sensitive */
GPIO_SENSE_HIGH_LEVEL, /* Low-level sensitive */
GPIO_SENSE_RISING, /* Rising-edge sensitive */
GPIO_SENSE_FALLING, /* Falling-edge sensitive */
};
#define GPIO_SENSE_CONFIG_MASK 0x3
/* Register map for each module */
struct gpio_map
{
volatile uint32_t dr; /* 00h */
volatile uint32_t gdir; /* 04h */
volatile uint32_t psr; /* 08h */
volatile uint32_t icr[2]; /* 0Ch */
volatile uint32_t imr; /* 14h */
volatile uint32_t isr; /* 18h */
};
/* Pending events will be called in array order */
/* Describes a single event for a pin */
struct gpio_event
{
int line; /* Line number (0-31) */
enum gpio_int_sense_enum sense; /* Type of sense */
int (*callback)(void); /* Callback function (return nonzero
* to indicate this event was handled) */
};
/* Describes the events attached to a port */
struct gpio_event_list
{
int priority; /* Interrupt priority for this GPIO */
unsigned count; /* Count of events */
const struct gpio_event *events; /* List of events */
};
void gpio_init(void);
bool gpio_enable_event(enum gpio_module_number gpio, unsigned id);
void gpio_disable_event(enum gpio_module_number gpio, unsigned id);
#endif /* GPIO_IMX31_H */
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