// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2015 Infineon Technologies AG * Copyright (C) 2016 STMicroelectronics SAS * * Authors: * Peter Huewe <[email protected]> * Christophe Ricard <[email protected]> * * Maintained by: <[email protected]> * * Device driver for TCG/TCPA TPM (trusted platform module). * Specifications at www.trustedcomputinggroup.org * * This device driver implements the TPM interface as defined in * the TCG TPM Interface Spec version 1.3, revision 27 via _raw/native * SPI access_. * * It is based on the original tpm_tis device driver from Leendert van * Dorn and Kyleen Hall and Jarko Sakkinnen. */ #include <linux/acpi.h> #include <linux/completion.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/of.h> #include <linux/spi/spi.h> #include <linux/tpm.h> #include "tpm.h" #include "tpm_tis_core.h" #include "tpm_tis_spi.h" #define MAX_SPI_FRAMESIZE … #define SPI_HDRSIZE … /* * TCG SPI flow control is documented in section 6.4 of the spec[1]. In short, * keep trying to read from the device until MISO goes high indicating the * wait state has ended. * * [1] https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/ */ static int tpm_tis_spi_flow_control(struct tpm_tis_spi_phy *phy, struct spi_transfer *spi_xfer) { … } /* * Half duplex controller with support for TPM wait state detection like * Tegra QSPI need CMD, ADDR & DATA sent in single message to manage HW flow * control. Each phase sent in different transfer for controller to idenity * phase. */ static int tpm_tis_spi_transfer_half(struct tpm_tis_data *data, u32 addr, u16 len, u8 *in, const u8 *out) { … } static int tpm_tis_spi_transfer_full(struct tpm_tis_data *data, u32 addr, u16 len, u8 *in, const u8 *out) { … } int tpm_tis_spi_transfer(struct tpm_tis_data *data, u32 addr, u16 len, u8 *in, const u8 *out) { … } static int tpm_tis_spi_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len, u8 *result, enum tpm_tis_io_mode io_mode) { … } static int tpm_tis_spi_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len, const u8 *value, enum tpm_tis_io_mode io_mode) { … } int tpm_tis_spi_init(struct spi_device *spi, struct tpm_tis_spi_phy *phy, int irq, const struct tpm_tis_phy_ops *phy_ops) { … } static const struct tpm_tis_phy_ops tpm_spi_phy_ops = …; static int tpm_tis_spi_probe(struct spi_device *dev) { … } tpm_tis_spi_probe_func; static int tpm_tis_spi_driver_probe(struct spi_device *spi) { … } static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_spi_resume); static void tpm_tis_spi_remove(struct spi_device *dev) { … } static const struct spi_device_id tpm_tis_spi_id[] = …; MODULE_DEVICE_TABLE(spi, tpm_tis_spi_id); static const struct of_device_id of_tis_spi_match[] __maybe_unused = …; MODULE_DEVICE_TABLE(of, of_tis_spi_match); static const struct acpi_device_id acpi_tis_spi_match[] __maybe_unused = …; MODULE_DEVICE_TABLE(acpi, acpi_tis_spi_match); static struct spi_driver tpm_tis_spi_driver = …; module_spi_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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