diff options
Diffstat (limited to 'src/drivers/i2c/tpm')
| -rw-r--r-- | src/drivers/i2c/tpm/Kconfig | 5 | ||||
| -rw-r--r-- | src/drivers/i2c/tpm/Makefile.inc | 2 | ||||
| -rw-r--r-- | src/drivers/i2c/tpm/chip.c | 89 | ||||
| -rw-r--r-- | src/drivers/i2c/tpm/chip.h | 10 |
4 files changed, 106 insertions, 0 deletions
diff --git a/src/drivers/i2c/tpm/Kconfig b/src/drivers/i2c/tpm/Kconfig index 594ffd51b3..903fc3bbe5 100644 --- a/src/drivers/i2c/tpm/Kconfig +++ b/src/drivers/i2c/tpm/Kconfig @@ -11,3 +11,8 @@ config DRIVER_TPM_I2C_ADDR hex "I2C TPM chip address" default 2 # FIXME, workaround for Kconfig BS depends on I2C_TPM + +config DRIVER_I2C_TPM_ACPI + bool "Generate I2C TPM ACPI device" + default y if ARCH_X86 && I2C_TPM + default n diff --git a/src/drivers/i2c/tpm/Makefile.inc b/src/drivers/i2c/tpm/Makefile.inc index 4f5913fe39..3eb5de0518 100644 --- a/src/drivers/i2c/tpm/Makefile.inc +++ b/src/drivers/i2c/tpm/Makefile.inc @@ -2,3 +2,5 @@ ramstage-$(CONFIG_I2C_TPM) += tis.c tpm.c romstage-$(CONFIG_I2C_TPM) += tis.c tpm.c verstage-$(CONFIG_I2C_TPM) += tis.c tpm.c bootblock-$(CONFIG_I2C_TPM) += tis.c tpm.c + +ramstage-$(CONFIG_DRIVER_I2C_TPM_ACPI) += chip.c diff --git a/src/drivers/i2c/tpm/chip.c b/src/drivers/i2c/tpm/chip.c new file mode 100644 index 0000000000..1781e996e5 --- /dev/null +++ b/src/drivers/i2c/tpm/chip.c @@ -0,0 +1,89 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2016 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <arch/acpi_device.h> +#include <arch/acpigen.h> +#include <console/console.h> +#include <device/i2c.h> +#include <device/device.h> +#include <device/path.h> +#include <stdint.h> +#include <string.h> +#include "tpm.h" +#include "chip.h" + +static void i2c_tpm_fill_ssdt(struct device *dev) +{ + 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 (!dev->enabled || !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_STATUS_DEVICE_ALL_ON); + + /* Resources */ + acpigen_write_name("_CRS"); + acpigen_write_resourcetemplate_header(); + acpi_device_write_i2c(&i2c); + acpi_device_write_interrupt(&config->irq); + acpigen_write_resourcetemplate_footer(); + + 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(struct device *dev) +{ + return "TPMI"; +} + +static struct device_operations i2c_tpm_ops = { + .read_resources = DEVICE_NOOP, + .set_resources = DEVICE_NOOP, + .enable_resources = DEVICE_NOOP, + .acpi_name = &i2c_tpm_acpi_name, + .acpi_fill_ssdt_generator = &i2c_tpm_fill_ssdt, +}; + +static void i2c_tpm_enable(struct device *dev) +{ + dev->ops = &i2c_tpm_ops; +} + +struct chip_operations drivers_i2c_tpm_ops = { + CHIP_NAME("I2C TPM") + .enable_dev = &i2c_tpm_enable +}; diff --git a/src/drivers/i2c/tpm/chip.h b/src/drivers/i2c/tpm/chip.h new file mode 100644 index 0000000000..14103c7cc3 --- /dev/null +++ b/src/drivers/i2c/tpm/chip.h @@ -0,0 +1,10 @@ +#include <arch/acpi_device.h> +#include <device/i2c.h> + +struct drivers_i2c_tpm_config { + const char *hid; /* ACPI _HID (required) */ + const char *desc; /* Device Description */ + unsigned uid; /* ACPI _UID */ + enum i2c_speed speed; /* Bus speed in Hz, default is I2C_SPEED_FAST */ + struct acpi_irq irq; /* Interrupt */ +}; |