diff options
Diffstat (limited to 'include/asm-avr32/arch-common/portmux-gpio.h')
| -rw-r--r-- | include/asm-avr32/arch-common/portmux-gpio.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/include/asm-avr32/arch-common/portmux-gpio.h b/include/asm-avr32/arch-common/portmux-gpio.h new file mode 100644 index 0000000..1306cbe --- /dev/null +++ b/include/asm-avr32/arch-common/portmux-gpio.h @@ -0,0 +1,114 @@ +/* + * 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__ */ |