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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <acpi/acpigen.h>
#include <acpi/acpi_device.h>
#include <console/console.h>
#include <device/device.h>
#include <device/path.h>
#include <gpio.h>
#include <string.h>
#include "chip.h"
/* Unique ID for the retimer _DSM. */
#define INTEL_USB4_RETIMER_DSM_UUID "61788900-C470-42BB-80F0-23A313864593"
/*
* Arg0: UUID
* Arg1: Revision ID (set to 1)
* Arg2: Function Index
* 0: Query command implemented
* 1: Query force power enable state
* 2: Set force power state
* Arg3: A package containing parameters for the function specified
* by the UUID, revision ID and function index.
*/
static void usb4_retimer_cb_standard_query(void *arg)
{
/*
* ToInteger (Arg1, Local2)
* If (Local2 == 1) {
* Return(Buffer() {0x07})
* }
* Return (Buffer() {0x01})
*/
acpigen_write_to_integer(ARG1_OP, LOCAL2_OP);
/* Revision 1 supports 2 Functions beyond the standard query */
acpigen_write_if_lequal_op_int(LOCAL2_OP, 1);
acpigen_write_return_singleton_buffer(0x07);
acpigen_pop_len(); /* If */
/* Other revisions support no additional functions */
acpigen_write_return_singleton_buffer(0);
}
static void usb4_retimer_cb_get_power_state(void *arg)
{
struct acpi_gpio *power_gpio = arg;
/*
* // Read power gpio into Local0
* Store (\_SB.PCI0.GTXS (power_gpio), Local0)
* Return (Local0)
*/
acpigen_get_tx_gpio(power_gpio);
acpigen_write_return_op(LOCAL0_OP);
}
static void usb4_retimer_cb_set_power_state(void *arg)
{
struct acpi_gpio *power_gpio = arg;
/*
* // Get argument for on/off from Arg3[0]
* Local0 = DeRefOf (Arg3[0])
*/
acpigen_get_package_op_element(ARG3_OP, 0, LOCAL0_OP);
/*
* If (Local0 == 0) {
* // Turn power off
* \_SB.PCI0.CTXS (power_gpio)
* }
*/
acpigen_write_if_lequal_op_int(LOCAL0_OP, 0);
acpigen_disable_tx_gpio(power_gpio);
acpigen_pop_len(); /* If */
/*
* Else {
* // Turn power on
* \_SB.PCI0.STXS (power_gpio)
* }
*/
acpigen_write_else();
acpigen_enable_tx_gpio(power_gpio);
acpigen_pop_len();
/* Return (Zero) */
acpigen_write_return_integer(0);
}
static void (*usb4_retimer_callbacks[3])(void *) = {
usb4_retimer_cb_standard_query, /* Function 0 */
usb4_retimer_cb_get_power_state, /* Function 1 */
usb4_retimer_cb_set_power_state, /* Function 2 */
};
static void usb4_retimer_fill_ssdt(const struct device *dev)
{
const struct drivers_intel_usb4_retimer_config *config = dev->chip_info;
const char *scope = acpi_device_scope(dev);
if (!scope || !config)
return;
if (!config->power_gpio.pin_count) {
printk(BIOS_ERR, "%s: Power GPIO required for %s\n", __func__, dev_path(dev));
return;
}
/* Write the _DSM that toggles power with provided GPIO. */
acpigen_write_scope(scope);
acpigen_write_dsm(INTEL_USB4_RETIMER_DSM_UUID, usb4_retimer_callbacks,
ARRAY_SIZE(usb4_retimer_callbacks), (void *)&config->power_gpio);
acpigen_pop_len(); /* Scope */
printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev), dev->chip_ops->name,
dev_path(dev));
}
static struct device_operations usb4_retimer_dev_ops = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
.acpi_fill_ssdt = usb4_retimer_fill_ssdt,
};
static void usb4_retimer_enable(struct device *dev)
{
dev->ops = &usb4_retimer_dev_ops;
}
struct chip_operations drivers_intel_usb4_retimer_ops = {
CHIP_NAME("Intel USB4 Retimer")
.enable_dev = usb4_retimer_enable
};
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