cpu/allwinner/a10: Add functions for driving GPIO pins
Change-Id: I9473a6e574c3af02d154a7e30245f0dc0b238300 Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> Reviewed-on: http://review.coreboot.org/4599 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: David Hendricks <dhendrix@chromium.org>
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@ -1,4 +1,5 @@
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bootblock-y += clock.c
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bootblock-y += gpio.c
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bootblock-y += pinmux.c
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bootblock-y += bootblock_media.c
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bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += uart.c
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@ -0,0 +1,98 @@
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/*
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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] value 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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@ -50,6 +50,14 @@ struct a10_gpio {
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u32 sdr_pad_pul;
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} __attribute__ ((packed));
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/* gpio.c */
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void gpio_set(u8 port, u8 pin);
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void gpio_clear(u8 port, u8 pin);
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int gpio_get(u8 port, u8 pin);
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void gpio_write(u8 port, u32 val);
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u32 gpio_read(u8 port);
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/* pinmux.c */
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void gpio_set_pin_func(u8 port, u8 pin, u8 pad_func);
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void gpio_set_multipin_func(u8 port, u32 pin_mask, u8 pad_func);
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