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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <acpi/acpi_device.h>
#include <acpi/acpigen.h>
#include <console/console.h>
#include <device/path.h>
#include <string.h>
#include "chip.h"
static bool uart_acpi_add_gpios_to_crs(struct drivers_uart_acpi_config *config)
{
/*
* Return false if:
* 1. GPIOs are exported via a power resource, or
* 2. Both reset and enable GPIOs are not provided.
*/
if (config->has_power_resource ||
((config->reset_gpio.pin_count == 0) &&
(config->enable_gpio.pin_count == 0)))
return false;
return true;
}
static int uart_acpi_write_gpio(struct acpi_gpio *gpio, int *curr_index)
{
int ret = -1;
if (gpio->pin_count == 0)
return ret;
acpi_device_write_gpio(gpio);
ret = *curr_index;
(*curr_index)++;
return ret;
}
static void uart_acpi_fill_ssdt(const struct device *dev)
{
const char *scope = acpi_device_scope(dev);
const char *path = acpi_device_path(dev);
struct drivers_uart_acpi_config *config = dev->chip_info;
int curr_index = 0;
int irq_gpio_index = -1;
int reset_gpio_index = -1;
int enable_gpio_index = -1;
if (!scope)
return;
if (!config->hid) {
printk(BIOS_ERR, "%s: ERROR: HID required\n", dev_path(dev));
return;
}
acpigen_write_scope(scope);
acpigen_write_device(acpi_device_name(dev));
acpigen_write_name_string("_HID", config->hid);
if (config->cid)
acpigen_write_name_string("_CID", config->cid);
acpigen_write_name_integer("_UID", config->uid);
acpigen_write_name_string("_DDN", config->desc);
acpigen_write_STA(acpi_device_status(dev));
/* Resources */
acpigen_write_name("_CRS");
acpigen_write_resourcetemplate_header();
/* Fix up resource pointer to this scope */
config->uart.resource = scope;
acpi_device_write_uart(&config->uart);
/* Use either Interrupt() or GpioInt() */
if (config->irq_gpio.pin_count)
acpi_device_write_gpio(&config->irq_gpio);
else
acpi_device_write_interrupt(&config->irq);
/* Add enable/reset GPIOs if needed */
if (uart_acpi_add_gpios_to_crs(config)) {
reset_gpio_index = uart_acpi_write_gpio(&config->reset_gpio,
&curr_index);
enable_gpio_index = uart_acpi_write_gpio(&config->enable_gpio,
&curr_index);
}
acpigen_write_resourcetemplate_footer();
/* Wake capabilities */
if (config->wake) {
acpigen_write_name_integer("_S0W", ACPI_DEVICE_SLEEP_D3_HOT);
acpigen_write_PRW(config->wake, SLP_TYP_S3);
};
/* Write device properties if needed */
if (config->compat_string || irq_gpio_index >= 0 ||
reset_gpio_index >= 0 || enable_gpio_index >= 0) {
struct acpi_dp *dsd = acpi_dp_new_table("_DSD");
if (config->compat_string)
acpi_dp_add_string(dsd, "compatible",
config->compat_string);
if (irq_gpio_index >= 0)
acpi_dp_add_gpio(dsd, "irq-gpios", path,
irq_gpio_index, 0,
config->irq_gpio.active_low);
if (reset_gpio_index >= 0)
acpi_dp_add_gpio(dsd, "reset-gpios", path,
reset_gpio_index, 0,
config->reset_gpio.active_low);
if (enable_gpio_index >= 0)
acpi_dp_add_gpio(dsd, "enable-gpios", path,
enable_gpio_index, 0,
config->enable_gpio.active_low);
acpi_dp_write(dsd);
}
/* Power Resource */
if (config->has_power_resource) {
const struct acpi_power_res_params power_res_params = {
&config->reset_gpio,
config->reset_delay_ms,
config->reset_off_delay_ms,
&config->enable_gpio,
config->enable_delay_ms,
config->enable_off_delay_ms,
&config->stop_gpio,
config->stop_delay_ms,
config->stop_off_delay_ms
};
acpi_device_add_power_res(&power_res_params);
}
acpigen_pop_len(); /* Device */
acpigen_pop_len(); /* Scope */
printk(BIOS_INFO, "%s: %s at %s\n", path, config->desc, dev_path(dev));
}
static const char *uart_acpi_name(const struct device *dev)
{
struct drivers_uart_acpi_config *config = dev->chip_info;
static char name[5];
if (config->name)
return config->name;
snprintf(name, sizeof(name), "D%03.3X", dev->path.generic.id);
return name;
}
static struct device_operations uart_acpi_dev_ops = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
.acpi_fill_ssdt = uart_acpi_fill_ssdt,
.acpi_name = uart_acpi_name,
};
static void uart_acpi_enable(struct device *dev)
{
struct drivers_uart_acpi_config *config = dev->chip_info;
if (config->desc)
dev->name = config->desc;
else
config->desc = dev->chip_ops->name;
dev->ops = &uart_acpi_dev_ops;
}
struct chip_operations drivers_uart_acpi_ops = {
CHIP_NAME("ACPI UART Device")
.enable_dev = uart_acpi_enable
};
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