mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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150 lines
4.3 KiB
C
150 lines
4.3 KiB
C
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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 "lib/printk.h"
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enum tegra_gpio_shifts {
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GPIO_BANK_SHIFT = 5,
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GPIO_PORT_SHIFT = 3,
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};
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enum tegra_gpio_masks {
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GPIO_PORT_MASK = 0x3,
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GPIO_PIN_MASK = 0x7,
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};
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/**
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* Returns a GPIO bank object that corresponds to the given GPIO pin,
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* which can be created using the TEGRA_GPIO macro or passed from the name macro.
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*
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* @param pin The GPIO to get the bank for.
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* @return The GPIO bank object to use for working with the given bank.
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*/
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static volatile struct tegra_gpio_bank *gpio_get_bank(enum tegra_named_gpio pin)
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{
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volatile struct tegra_gpio *gpio = gpio_get_regs();
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int bank_number = pin >> GPIO_BANK_SHIFT;
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return &gpio->bank[bank_number];
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}
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/**
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* @return the port number for working with the given GPIO.
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*/
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static volatile int gpio_get_port(enum tegra_named_gpio pin)
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{
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return (pin >> GPIO_PORT_SHIFT) & GPIO_PORT_MASK;
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}
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/**
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* @return a mask to be used to work with the given GPIO
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*/
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static volatile uint32_t gpio_get_mask(enum tegra_named_gpio pin)
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{
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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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/**
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* Performs a simple GPIO configuration operation.
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*
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* @param pin The GPIO pin to work with, as created with TEGRA_GPIO, or a named GPIO.
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* @param should_be_set True iff the relevant bit should be set; or false if it should be cleared.
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* @param offset The offset into a gpio_bank structure
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*/
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static void gpio_simple_register_set(enum tegra_named_gpio pin, bool should_be_set, size_t offset)
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{
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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,
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// and the mask to be used.
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int 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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}
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/**
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* Performs a simple GPIO configuration operation.
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*
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* @param pin The GPIO pin to work with, as created with TEGRA_GPIO, or a named GPIO.
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* @param should_be_set True iff the relevant bit should be set; or false if it should be cleared.
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* @param offset The offset into a gpio_bank structure
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*/
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static bool gpio_simple_register_get(enum tegra_named_gpio pin, size_t offset)
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{
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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,
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// and the mask to be used.
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int 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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/**
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* Configures a given pin as either GPIO or SFIO.
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*
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* @param pin The GPIO pin to work with, as created with TEGRA_GPIO, or a named GPIO.
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* @param mode The relevant mode.
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*/
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void gpio_configure_mode(enum tegra_named_gpio pin, enum tegra_gpio_mode mode)
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{
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gpio_simple_register_set(pin, mode == GPIO_MODE_GPIO, offsetof(struct tegra_gpio_bank, config));
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}
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/**
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* Configures a given pin as either INPUT or OUPUT.
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*
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* @param pin The GPIO pin to work with, as created with TEGRA_GPIO, or a named GPIO.
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* @param direction The relevant direction.
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*/
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void gpio_configure_direction(enum tegra_named_gpio pin, enum tegra_gpio_direction dir)
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{
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gpio_simple_register_set(pin, dir == GPIO_DIRECTION_OUTPUT, offsetof(struct tegra_gpio_bank, direction));
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}
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/**
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* Drives a relevant GPIO pin as either HIGH or LOW.
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*
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* @param pin The GPIO pin to work with, as created with TEGRA_GPIO, or a named GPIO.
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* @param mode The relevant mode.
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*/
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void gpio_write(enum tegra_named_gpio pin, enum tegra_gpio_value value)
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{
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gpio_simple_register_set(pin, value == GPIO_LEVEL_HIGH, offsetof(struct tegra_gpio_bank, out));
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}
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/**
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* Drives a relevant GPIO pin as either HIGH or LOW.
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*
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* @param pin The GPIO pin to work with, as created with TEGRA_GPIO, or a named GPIO.
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* @param mode The relevant mode.
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*/
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enum tegra_gpio_value gpio_read(enum tegra_named_gpio pin)
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{
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return gpio_simple_register_get(pin, offsetof(struct tegra_gpio_bank, in));
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}
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