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https://github.com/Atmosphere-NX/Atmosphere.git
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86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
/*
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* Copyright (c) 2018-2019 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include <stdint.h>
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#include <errno.h>
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#include "gpio.h"
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#include "utils.h"
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static volatile tegra_gpio_bank_t *gpio_get_bank(uint32_t pin) {
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volatile tegra_gpio_t *gpio = gpio_get_regs();
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uint32_t bank_number = (pin >> GPIO_BANK_SHIFT);
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return &gpio->bank[bank_number];
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}
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static volatile uint32_t gpio_get_port(uint32_t pin) {
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return ((pin >> GPIO_PORT_SHIFT) & GPIO_PORT_MASK);
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}
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static volatile uint32_t gpio_get_mask(uint32_t pin) {
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uint32_t pin_number = (pin & GPIO_PIN_MASK);
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return (1 << pin_number);
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}
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static void gpio_simple_register_set(uint32_t pin, bool should_be_set, uint32_t offset) {
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/* Retrieve the register set that corresponds to the given pin and offset. */
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uintptr_t cluster_addr = (uintptr_t)gpio_get_bank(pin) + offset;
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uint32_t *cluster = (uint32_t *)cluster_addr;
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/* Figure out the offset into the cluster, and the mask to be used. */
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uint32_t port = gpio_get_port(pin);
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uint32_t mask = gpio_get_mask(pin);
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/* Set or clear the bit, as appropriate. */
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if (should_be_set)
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cluster[port] |= mask;
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else
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cluster[port] &= ~mask;
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/* Dummy read. */
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(void)cluster[port];
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}
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static bool gpio_simple_register_get(uint32_t pin, uint32_t offset) {
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/* Retrieve the register set that corresponds to the given pin and offset. */
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uintptr_t cluster_addr = (uintptr_t)gpio_get_bank(pin) + offset;
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uint32_t *cluster = (uint32_t *)cluster_addr;
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/* Figure out the offset into the cluster, and the mask to be used. */
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uint32_t port = gpio_get_port(pin);
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uint32_t mask = gpio_get_mask(pin);
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/* Convert the given value to a boolean. */
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return !!(cluster[port] & mask);
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}
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void gpio_configure_mode(uint32_t pin, uint32_t mode) {
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gpio_simple_register_set(pin, mode == GPIO_MODE_GPIO, offsetof(tegra_gpio_bank_t, config));
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}
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void gpio_configure_direction(uint32_t pin, uint32_t dir) {
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gpio_simple_register_set(pin, dir == GPIO_DIRECTION_OUTPUT, offsetof(tegra_gpio_bank_t, direction));
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}
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void gpio_write(uint32_t pin, uint32_t value) {
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gpio_simple_register_set(pin, value == GPIO_LEVEL_HIGH, offsetof(tegra_gpio_bank_t, out));
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}
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uint32_t gpio_read(uint32_t pin) {
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return gpio_simple_register_get(pin, offsetof(tegra_gpio_bank_t, in));
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}
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