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