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