chip.c

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/* 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 */
                break;
        }
        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
};