89 строки
2.4 KiB
C
89 строки
2.4 KiB
C
/*
|
|
* TI DaVinci GPIO Support
|
|
*
|
|
* Copyright (c) 2006 David Brownell
|
|
* Copyright (c) 2007, MontaVista Software, Inc. <source@mvista.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef __DAVINCI_GPIO_H
|
|
#define __DAVINCI_GPIO_H
|
|
|
|
#include <asm-generic/gpio.h>
|
|
|
|
#define __ARM_GPIOLIB_COMPLEX
|
|
|
|
/* The inline versions use the static inlines in the driver header */
|
|
#include "gpio-davinci.h"
|
|
|
|
/*
|
|
* The get/set/clear functions will inline when called with constant
|
|
* parameters referencing built-in GPIOs, for low-overhead bitbanging.
|
|
*
|
|
* gpio_set_value() will inline only on traditional Davinci style controllers
|
|
* with distinct set/clear registers.
|
|
*
|
|
* Otherwise, calls with variable parameters or referencing external
|
|
* GPIOs (e.g. on GPIO expander chips) use outlined functions.
|
|
*/
|
|
static inline void gpio_set_value(unsigned gpio, int value)
|
|
{
|
|
if (__builtin_constant_p(value) && gpio < davinci_soc_info.gpio_num) {
|
|
struct davinci_gpio_controller *ctlr;
|
|
u32 mask;
|
|
|
|
ctlr = __gpio_to_controller(gpio);
|
|
|
|
if (ctlr->set_data != ctlr->clr_data) {
|
|
mask = __gpio_mask(gpio);
|
|
if (value)
|
|
__raw_writel(mask, ctlr->set_data);
|
|
else
|
|
__raw_writel(mask, ctlr->clr_data);
|
|
return;
|
|
}
|
|
}
|
|
|
|
__gpio_set_value(gpio, value);
|
|
}
|
|
|
|
/* Returns zero or nonzero; works for gpios configured as inputs OR
|
|
* as outputs, at least for built-in GPIOs.
|
|
*
|
|
* NOTE: for built-in GPIOs, changes in reported values are synchronized
|
|
* to the GPIO clock. This is easily seen after calling gpio_set_value()
|
|
* and then immediately gpio_get_value(), where the gpio_get_value() will
|
|
* return the old value until the GPIO clock ticks and the new value gets
|
|
* latched.
|
|
*/
|
|
static inline int gpio_get_value(unsigned gpio)
|
|
{
|
|
struct davinci_gpio_controller *ctlr;
|
|
|
|
if (!__builtin_constant_p(gpio) || gpio >= davinci_soc_info.gpio_num)
|
|
return __gpio_get_value(gpio);
|
|
|
|
ctlr = __gpio_to_controller(gpio);
|
|
return __gpio_mask(gpio) & __raw_readl(ctlr->in_data);
|
|
}
|
|
|
|
static inline int gpio_cansleep(unsigned gpio)
|
|
{
|
|
if (__builtin_constant_p(gpio) && gpio < davinci_soc_info.gpio_num)
|
|
return 0;
|
|
else
|
|
return __gpio_cansleep(gpio);
|
|
}
|
|
|
|
static inline int irq_to_gpio(unsigned irq)
|
|
{
|
|
/* don't support the reverse mapping */
|
|
return -ENOSYS;
|
|
}
|
|
|
|
#endif /* __DAVINCI_GPIO_H */
|