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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <acpi/acpigen.h>
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <stdint.h>
#include "chip.h"
#define ACPI_DSM_PRIVACY_SCREEN_UUID "C7033113-8720-4CEB-9090-9D52B3E52D73"
#define ACPI_METHOD_EPS_PRESENT "EPSP"
#define ACPI_METHOD_EPS_STATE "EPSS"
#define ACPI_METHOD_EPS_ENABLE "EPSE"
#define ACPI_METHOD_EPS_DISABLE "EPSD"
static void privacy_screen_detect_cb(void *arg)
{
struct drivers_gfx_generic_privacy_screen_config *config = arg;
acpigen_write_store();
acpigen_emit_namestring(config->detect_function);
acpigen_emit_byte(LOCAL2_OP);
acpigen_write_if_lequal_op_int(LOCAL2_OP, 1);
acpigen_write_return_singleton_buffer(0xF);
acpigen_pop_len();
}
static void privacy_screen_get_status_cb(void *arg)
{
struct drivers_gfx_generic_privacy_screen_config *config = arg;
acpigen_emit_byte(RETURN_OP);
acpigen_emit_namestring(config->status_function);
}
static void privacy_screen_enable_cb(void *arg)
{
struct drivers_gfx_generic_privacy_screen_config *config = arg;
acpigen_emit_namestring(config->enable_function);
}
static void privacy_screen_disable_cb(void *arg)
{
struct drivers_gfx_generic_privacy_screen_config *config = arg;
acpigen_emit_namestring(config->disable_function);
}
static void (*privacy_screen_callbacks[])(void *) = {
privacy_screen_detect_cb,
privacy_screen_get_status_cb,
privacy_screen_enable_cb,
privacy_screen_disable_cb,
};
static void privacy_gpio_acpigen(struct acpi_gpio *gpio)
{
/* EPS Present */
acpigen_write_method(ACPI_METHOD_EPS_PRESENT, 0);
acpigen_write_return_byte(1);
acpigen_pop_len();
/* EPS State */
acpigen_write_method(ACPI_METHOD_EPS_STATE, 0);
acpigen_get_rx_gpio(gpio);
acpigen_emit_byte(RETURN_OP);
acpigen_emit_byte(LOCAL0_OP);
acpigen_pop_len();
/* EPS Enable */
acpigen_write_method(ACPI_METHOD_EPS_ENABLE, 0);
acpigen_enable_tx_gpio(gpio);
acpigen_pop_len();
/* EPS Disable */
acpigen_write_method(ACPI_METHOD_EPS_DISABLE, 0);
acpigen_disable_tx_gpio(gpio);
acpigen_pop_len();
}
static void gfx_fill_privacy_screen_dsm(
struct drivers_gfx_generic_privacy_screen_config *privacy)
{
if (!privacy->enabled)
return;
/* Populate ACPI methods, if EPS controlled via gpio */
if (privacy->gpio.pin_count == 1) {
privacy_gpio_acpigen(&privacy->gpio);
privacy->detect_function = ACPI_METHOD_EPS_PRESENT;
privacy->status_function = ACPI_METHOD_EPS_STATE;
privacy->enable_function = ACPI_METHOD_EPS_ENABLE;
privacy->disable_function = ACPI_METHOD_EPS_DISABLE;
}
acpigen_write_dsm(ACPI_DSM_PRIVACY_SCREEN_UUID,
privacy_screen_callbacks,
ARRAY_SIZE(privacy_screen_callbacks),
privacy);
}
static void gfx_fill_ssdt_generator(const struct device *dev)
{
size_t i;
struct drivers_gfx_generic_config *config = dev->chip_info;
const char *scope = acpi_device_scope(dev);
if (!scope || !dev->enabled)
return;
acpigen_write_scope(scope);
/* Method (_DOD, 0) */
acpigen_write_method("_DOD", 0);
acpigen_emit_byte(RETURN_OP);
acpigen_write_package(config->device_count);
for (i = 0; i < config->device_count; i++)
acpigen_write_dword(config->device[i].addr);
acpigen_pop_len(); /* End Package. */
acpigen_pop_len(); /* End Method. */
for (i = 0; i < config->device_count; i++) {
acpigen_write_device(config->device[i].name);
acpigen_write_name_integer("_ADR", config->device[i].addr);
acpigen_write_name_integer("_STA", 0xF);
gfx_fill_privacy_screen_dsm(&config->device[i].privacy);
acpigen_pop_len(); /* Device */
}
acpigen_pop_len(); /* Scope */
}
static const char *gfx_acpi_name(const struct device *dev)
{
struct drivers_gfx_generic_config *config = dev->chip_info;
return config->name ? : "GFX0";
}
static struct device_operations gfx_ops = {
.acpi_name = gfx_acpi_name,
.acpi_fill_ssdt = gfx_fill_ssdt_generator,
};
static void gfx_enable(struct device *dev)
{
struct drivers_gfx_generic_config *config = dev->chip_info;
if (!config || !dev->enabled)
return;
dev->ops = &gfx_ops;
}
struct chip_operations drivers_gfx_generic_ops = {
CHIP_NAME("Generic Graphics Device")
.enable_dev = gfx_enable
};
struct device *find_gfx_dev(void)
{
struct device *dev;
for (dev = all_devices; dev; dev = dev->next) {
if (dev->chip_ops && dev->chip_ops == &drivers_gfx_generic_ops)
return dev;
}
return NULL;
}
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