5e3c454fbb
Introduce firmware-power-managed DSD ACPI property for TPM devices. This property can be checked by the kernel TPM driver to override how the TPM power states are managed. This is a tri-state flag, true, false, or unset. So an enum used to keep the flag is unset by default. When firmware-power-managed is true, the kernel driver will not send a shutdown during s2idle/s0i3 suspend. BUG=b:200578885 BRANCH=None TEST=TPM shutdown is triggered on s0ix suspend on guybrush with patched kernel Change-Id: Ia48ead856fc0c6e637a2e07a5ecc58423f599c5b Signed-off-by: Rob Barnes <robbarnes@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/59479 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Raul Rangel <rrangel@chromium.org>
100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
|
|
#include <acpi/acpi_device.h>
|
|
#include <acpi/acpigen.h>
|
|
#include <console/console.h>
|
|
#include <device/i2c_simple.h>
|
|
#include <device/device.h>
|
|
#include <device/path.h>
|
|
#include "tpm.h"
|
|
#include "chip.h"
|
|
|
|
static void i2c_tpm_fill_ssdt(const struct device *dev)
|
|
{
|
|
struct acpi_dp *dsd;
|
|
struct drivers_i2c_tpm_config *config = dev->chip_info;
|
|
const char *scope = acpi_device_scope(dev);
|
|
struct acpi_i2c i2c = {
|
|
.address = dev->path.i2c.device,
|
|
.mode_10bit = dev->path.i2c.mode_10bit,
|
|
.speed = config->speed ? : I2C_SPEED_FAST,
|
|
.resource = scope,
|
|
};
|
|
|
|
if (!scope)
|
|
return;
|
|
|
|
if (!config->hid) {
|
|
printk(BIOS_ERR, "%s: ERROR: HID required\n", dev_path(dev));
|
|
return;
|
|
}
|
|
|
|
/* Device */
|
|
acpigen_write_scope(scope);
|
|
acpigen_write_device(acpi_device_name(dev));
|
|
acpigen_write_name_string("_HID", config->hid);
|
|
acpigen_write_name_integer("_UID", config->uid);
|
|
acpigen_write_name_string("_DDN", dev->chip_ops->name);
|
|
acpigen_write_STA(acpi_device_status(dev));
|
|
|
|
/* Resources */
|
|
acpigen_write_name("_CRS");
|
|
acpigen_write_resourcetemplate_header();
|
|
acpi_device_write_i2c(&i2c);
|
|
if (config->irq_gpio.pin_count)
|
|
acpi_device_write_gpio(&config->irq_gpio);
|
|
else
|
|
acpi_device_write_interrupt(&config->irq);
|
|
|
|
acpigen_write_resourcetemplate_footer();
|
|
|
|
/* _DSD, Device-Specific Data */
|
|
dsd = acpi_dp_new_table("_DSD");
|
|
switch (config->power_managed_mode) {
|
|
case TPM_FIRMWARE_POWER_MANAGED:
|
|
acpi_dp_add_integer(dsd, "firmware-power-managed", 1);
|
|
break;
|
|
case TPM_KERNEL_POWER_MANAGED:
|
|
acpi_dp_add_integer(dsd, "firmware-power-managed", 0);
|
|
break;
|
|
case TPM_DEFAULT_POWER_MANAGED:
|
|
default:
|
|
/* Leave firmware-power-managed unset */
|
|
}
|
|
acpi_dp_write(dsd);
|
|
|
|
acpigen_pop_len(); /* Device */
|
|
acpigen_pop_len(); /* Scope */
|
|
|
|
printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev),
|
|
dev->chip_ops->name, dev_path(dev));
|
|
}
|
|
|
|
static const char *i2c_tpm_acpi_name(const struct device *dev)
|
|
{
|
|
return "TPMI";
|
|
}
|
|
|
|
static struct device_operations i2c_tpm_ops = {
|
|
.read_resources = noop_read_resources,
|
|
.set_resources = noop_set_resources,
|
|
.acpi_name = i2c_tpm_acpi_name,
|
|
.acpi_fill_ssdt = i2c_tpm_fill_ssdt,
|
|
};
|
|
|
|
static void i2c_tpm_enable(struct device *dev)
|
|
{
|
|
struct drivers_i2c_tpm_config *config = dev->chip_info;
|
|
|
|
dev->ops = &i2c_tpm_ops;
|
|
|
|
if (config && config->desc) {
|
|
dev->name = config->desc;
|
|
}
|
|
}
|
|
|
|
struct chip_operations drivers_i2c_tpm_ops = {
|
|
CHIP_NAME("I2C TPM")
|
|
.enable_dev = i2c_tpm_enable
|
|
};
|