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/*
* Copyright (C) 2008 Atmel Corporation
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef __AVR32_PORTMUX_GPIO_H__
#define __AVR32_PORTMUX_GPIO_H__
#include <asm/io.h>
/* Register layout for this specific device */
#include <asm/arch/gpio-impl.h>
/* Register access macros */
#define gpio_readl(port, reg) \
__raw_readl(&((struct gpio_regs *)port)->reg)
#define gpio_writel(gpio, reg, value) \
__raw_writel(value, &((struct gpio_regs *)port)->reg)
/* Portmux API starts here. See doc/README.AVR32-port-muxing */
enum portmux_function {
PORTMUX_FUNC_A,
PORTMUX_FUNC_B,
PORTMUX_FUNC_C,
PORTMUX_FUNC_D,
};
#define PORTMUX_DIR_INPUT (0 << 0)
#define PORTMUX_DIR_OUTPUT (1 << 0)
#define PORTMUX_INIT_LOW (0 << 1)
#define PORTMUX_INIT_HIGH (1 << 1)
#define PORTMUX_PULL_UP (1 << 2)
#define PORTMUX_PULL_DOWN (2 << 2)
#define PORTMUX_BUSKEEPER (3 << 2)
#define PORTMUX_DRIVE_MIN (0 << 4)
#define PORTMUX_DRIVE_LOW (1 << 4)
#define PORTMUX_DRIVE_HIGH (2 << 4)
#define PORTMUX_DRIVE_MAX (3 << 4)
#define PORTMUX_OPEN_DRAIN (1 << 6)
void portmux_select_peripheral(void *port, unsigned long pin_mask,
enum portmux_function func, unsigned long flags);
void portmux_select_gpio(void *port, unsigned long pin_mask,
unsigned long flags);
/* Internal helper functions */
static inline void *gpio_pin_to_port(unsigned int pin)
{
return (void *)GPIO_BASE + (pin >> 5) * 0x200;
}
static inline void __gpio_set_output_value(void *port, unsigned int pin,
int value)
{
if (value)
gpio_writel(port, OVRS, 1 << pin);
else
gpio_writel(port, OVRC, 1 << pin);
}
static inline int __gpio_get_input_value(void *port, unsigned int pin)
{
return (gpio_readl(port, PVR) >> pin) & 1;
}
void gpio_set_output_value(unsigned int pin, int value);
int gpio_get_input_value(unsigned int pin);
/* GPIO API starts here */
/*
* GCC doesn't realize that the constant case is extremely trivial,
* so we need to help it make the right decision by using
* always_inline.
*/
__attribute__((always_inline))
static inline void gpio_set_value(unsigned int pin, int value)
{
if (__builtin_constant_p(pin))
__gpio_set_output_value(gpio_pin_to_port(pin),
pin & 0x1f, value);
else
gpio_set_output_value(pin, value);
}
__attribute__((always_inline))
static inline int gpio_get_value(unsigned int pin)
{
if (__builtin_constant_p(pin))
return __gpio_get_input_value(gpio_pin_to_port(pin),
pin & 0x1f);
else
return gpio_get_input_value(pin);
}
#endif /* __AVR32_PORTMUX_GPIO_H__ */
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