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In some cases access to GPIOs is needed so early that DM is not ready even nearly. These functions are exactly for this case. Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Simple GPIO access from SPL. This only supports a single GPIO space,
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* typically the SoC GPIO banks.
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*
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* Copyright 2018 Google LLC
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*/
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#ifndef __SPL_GPIO_H
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#define __SPL_GPIO_H
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#include <asm/gpio.h>
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/*
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* The functions listed here should be implemented in the SoC GPIO driver.
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* They correspond to the normal GPIO API (asm-generic/gpio.h). The GPIO
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* number is encoded in an unsigned int by an SoC-specific means. Pull
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* values are also SoC-specific.
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*
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* This API should only be used in TPL/SPL where GPIO access is needed but
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* driver model is not available (yet) or adds too much overhead.
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*
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* The caller must supply the GPIO register base since this information is
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* often specific to a particular SoC generation. This allows the GPIO
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* code to be fairly generic.
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*
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* Only a single implementation of each of these functions can be provided.
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*
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* The 'gpio' value can include both a bank and a GPIO number, if desired. The
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* encoding is SoC-specific.
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*/
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/**
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* spl_gpio_set_pull() - Set the pull up/down state of a GPIO
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*
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* @regs: Pointer to GPIO registers
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* @gpio: GPIO to adjust (SoC-specific)
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* @pull: Pull value (SoC-specific)
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* Return: return 0 if OK, -ve on error
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*/
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int spl_gpio_set_pull(void *regs, uint gpio, int pull);
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/**
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* spl_gpio_output() - Set a GPIO as an output
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*
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* @regs: Pointer to GPIO registers
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* @gpio: GPIO to adjust (SoC-specific)
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* @value: 0 to set the output low, 1 to set it high
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* Return: return 0 if OK, -ve on error
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*/
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int spl_gpio_output(void *regs, uint gpio, int value);
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/**
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* spl_gpio_input() - Set a GPIO as an input
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*
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* @regs: Pointer to GPIO registers
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* @gpio: GPIO to adjust (SoC-specific)
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* Return: return 0 if OK, -ve on error
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*/
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int spl_gpio_input(void *regs, uint gpio);
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/**
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* spl_gpio_get_value() - Get GPIO value
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*
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* @regs: Pointer to GPIO registers
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* @gpio: GPIO to adjust (SoC-specific)
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* Return: return GPIO value if OK, -ve on error
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*/
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int spl_gpio_get_value(void *regs, uint gpio);
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/**
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* spl_gpio_set_value() - Set value on GPIO
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*
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* @regs: Pointer to GPIO registers
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* @gpio: GPIO to adjust (SoC-specific)
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* @value: 0 to set the output low, 1 to set it high
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* Return: return 0 if OK, -ve on error
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*/
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int spl_gpio_set_value(void *regs, uint gpio, int value);
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#endif /* __SPL_GPIO_H */
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