32bc6b6b84
The doxygen parameter names in the comments no longer matched the functions they were attached to. Doxygen complains about extra parameter comments and uncommented parameters in the functions. Change-Id: I21b8a951f8d8d04b07c3779000eeaf1e69fed463 Signed-off-by: Martin Roth <martin.roth@se-eng.com> Reviewed-on: http://review.coreboot.org/8101 Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com> Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
99 lines
2.1 KiB
C
99 lines
2.1 KiB
C
/*
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* Basic GPIO helpers for Allwinner CPUs
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*
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* Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
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* Subject to the GNU GPL v2, or (at your option) any later version.
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*/
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#include "gpio.h"
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#include <arch/io.h>
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static struct a10_gpio *const gpio = (void *)GPIO_BASE;
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/**
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* \brief Set a single output pin
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*
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* @param[in] port GPIO port of the pin (GPA -> GPS)
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* @param[in] pin the pin number in the given port (1 -> 31)
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*/
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void gpio_set(u8 port, u8 pin)
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{
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u32 reg32;
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if ((port > GPS))
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return;
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reg32 = gpio_read(port);
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reg32 |= (1 << pin);
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gpio_write(port, reg32);
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}
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/**
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* \brief Clear a single output pin
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*
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* @param[in] port GPIO port of the pin (GPA -> GPS)
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* @param[in] pin the pin number in the given port (1 -> 31)
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*/
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void gpio_clear(u8 port, u8 pin)
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{
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u32 reg32;
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if ((port > GPS))
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return;
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reg32 = gpio_read(port);
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reg32 &= ~(1 << pin);
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gpio_write(port, reg32);
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}
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/**
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* \brief Get the status of a single input pin
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*
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* @param[in] port GPIO port of the pin (GPA -> GPS)
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* @param[in] pin the pin number in the given port (1 -> 31)
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* @return 1 if the pin is high, or 0 if the pin is low
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*/
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int gpio_get(u8 port, u8 pin)
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{
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if ((port > GPS))
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return 0;
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return (gpio_read(port) & (1 << pin)) ? 1 : 0;
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}
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/**
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* \brief Write to a GPIO port
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*
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* Write the state of all output pins in the GPIO port. This only affects pins
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* configured as output pins.
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*
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* @param[in] port GPIO port of the pin (GPA -> GPS)
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* @param[in] val 32-bit mask indicating which pins to set. For a set bit, the
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* corresponding pin will be set. Otherwise, it will be cleared
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*/
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void gpio_write(u8 port, u32 val)
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{
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if ((port > GPS))
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return;
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write32(val, &gpio->port[port].dat);
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}
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/**
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* \brief Write to a GPIO port
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*
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* Read the state of all input pins in the GPIO port.
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*
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* @param[in] port GPIO port of the pin (GPA -> GPS)
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* @return 32-bit mask indicating which pins are high. For each set bit, the
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* corresponding pin is high. The value of bits corresponding to pins
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* which are not configured as inputs is undefined.
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*/
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u32 gpio_read(u8 port)
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{
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if ((port > GPS))
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return 0;
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return read32(&gpio->port[port].dat);
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}
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