// SPDX-License-Identifier: GPL-2.0-or-later /* * STMicroelectronics TPM SPI Linux driver for TPM ST33ZP24 * Copyright (C) 2009 - 2016 STMicroelectronics */ #include <linux/module.h> #include <linux/spi/spi.h> #include <linux/of.h> #include <linux/acpi.h> #include <linux/tpm.h> #include "../tpm.h" #include "st33zp24.h" #define TPM_DATA_FIFO … #define TPM_INTF_CAPABILITY … #define TPM_DUMMY_BYTE … #define MAX_SPI_LATENCY … #define LOCALITY0 … #define ST33ZP24_OK … #define ST33ZP24_UNDEFINED_ERR … #define ST33ZP24_BADLOCALITY … #define ST33ZP24_TISREGISTER_UNKNOWN … #define ST33ZP24_LOCALITY_NOT_ACTIVATED … #define ST33ZP24_HASH_END_BEFORE_HASH_START … #define ST33ZP24_BAD_COMMAND_ORDER … #define ST33ZP24_INCORECT_RECEIVED_LENGTH … #define ST33ZP24_TPM_FIFO_OVERFLOW … #define ST33ZP24_UNEXPECTED_READ_FIFO … #define ST33ZP24_UNEXPECTED_WRITE_FIFO … #define ST33ZP24_CMDRDY_SET_WHEN_PROCESSING_HASH_END … #define ST33ZP24_DUMMY_BYTES … /* * TPM command can be up to 2048 byte, A TPM response can be up to * 1024 byte. * Between command and response, there are latency byte (up to 15 * usually on st33zp24 2 are enough). * * Overall when sending a command and expecting an answer we need if * worst case: * 2048 (for the TPM command) + 1024 (for the TPM answer). We need * some latency byte before the answer is available (max 15). * We have 2048 + 1024 + 15. */ #define ST33ZP24_SPI_BUFFER_SIZE … struct st33zp24_spi_phy { … }; static int st33zp24_status_to_errno(u8 code) { … } /* * st33zp24_spi_send * Send byte to the TIS register according to the ST33ZP24 SPI protocol. * @param: phy_id, the phy description * @param: tpm_register, the tpm tis register where the data should be written * @param: tpm_data, the tpm_data to write inside the tpm_register * @param: tpm_size, The length of the data * @return: should be zero if success else a negative error code. */ static int st33zp24_spi_send(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size) { … } /* st33zp24_spi_send() */ /* * st33zp24_spi_read8_recv * Recv byte from the TIS register according to the ST33ZP24 SPI protocol. * @param: phy_id, the phy description * @param: tpm_register, the tpm tis register where the data should be read * @param: tpm_data, the TPM response * @param: tpm_size, tpm TPM response size to read. * @return: should be zero if success else a negative error code. */ static int st33zp24_spi_read8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size) { … } /* st33zp24_spi_read8_reg() */ /* * st33zp24_spi_recv * Recv byte from the TIS register according to the ST33ZP24 SPI protocol. * @param: phy_id, the phy description * @param: tpm_register, the tpm tis register where the data should be read * @param: tpm_data, the TPM response * @param: tpm_size, tpm TPM response size to read. * @return: number of byte read successfully: should be one if success. */ static int st33zp24_spi_recv(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size) { … } /* st33zp24_spi_recv() */ static int st33zp24_spi_evaluate_latency(void *phy_id) { … } /* evaluate_latency() */ static const struct st33zp24_phy_ops spi_phy_ops = …; /* * st33zp24_spi_probe initialize the TPM device * @param: dev, the spi_device description (TPM SPI description). * @return: 0 in case of success. * or a negative value describing the error. */ static int st33zp24_spi_probe(struct spi_device *dev) { … } /* * st33zp24_spi_remove remove the TPM device * @param: client, the spi_device description (TPM SPI description). * @return: 0 in case of success. */ static void st33zp24_spi_remove(struct spi_device *dev) { … } static const struct spi_device_id st33zp24_spi_id[] = …; MODULE_DEVICE_TABLE(spi, st33zp24_spi_id); static const struct of_device_id of_st33zp24_spi_match[] __maybe_unused = …; MODULE_DEVICE_TABLE(of, of_st33zp24_spi_match); static const struct acpi_device_id st33zp24_spi_acpi_match[] __maybe_unused = …; MODULE_DEVICE_TABLE(acpi, st33zp24_spi_acpi_match); static SIMPLE_DEV_PM_OPS(st33zp24_spi_ops, st33zp24_pm_suspend, st33zp24_pm_resume); static struct spi_driver st33zp24_spi_driver = …; module_spi_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_VERSION(…) …; MODULE_LICENSE(…) …;
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