/* * Copyright (C) 2011 Infineon Technologies * * Authors: * Peter Huewe <huewe.external@infineon.com> * * Version: 2.1.1 * * Description: * Device driver for TCG/TCPA TPM (trusted platform module). * Specifications at www.trustedcomputinggroup.org * * It is based on the Linux kernel driver tpm.c from Leendert van * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall. * * SPDX-License-Identifier: GPL-2.0 */ #ifndef _TPM_TIS_I2C_H #define _TPM_TIS_I2C_H #include <linux/compiler.h> #include <linux/types.h> enum tpm_timeout { TPM_TIMEOUT_MS = 5, TIS_SHORT_TIMEOUT_MS = 750, TIS_LONG_TIMEOUT_MS = 2000, SLEEP_DURATION_US = 60, SLEEP_DURATION_LONG_US = 210, }; /* Size of external transmit buffer (used in tpm_transmit)*/ #define TPM_BUFSIZE 4096 /* Index of Count field in TPM response buffer */ #define TPM_RSP_SIZE_BYTE 2 #define TPM_RSP_RC_BYTE 6 struct tpm_chip { int is_open; int locality; u32 vend_dev; unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* msec */ ulong chip_type; }; struct tpm_input_header { __be16 tag; __be32 length; __be32 ordinal; } __packed; struct tpm_output_header { __be16 tag; __be32 length; __be32 return_code; } __packed; struct timeout_t { __be32 a; __be32 b; __be32 c; __be32 d; } __packed; struct duration_t { __be32 tpm_short; __be32 tpm_medium; __be32 tpm_long; } __packed; union cap_t { struct timeout_t timeout; struct duration_t duration; }; struct tpm_getcap_params_in { __be32 cap; __be32 subcap_size; __be32 subcap; } __packed; struct tpm_getcap_params_out { __be32 cap_size; union cap_t cap; } __packed; union tpm_cmd_header { struct tpm_input_header in; struct tpm_output_header out; }; union tpm_cmd_params { struct tpm_getcap_params_out getcap_out; struct tpm_getcap_params_in getcap_in; }; struct tpm_cmd_t { union tpm_cmd_header header; union tpm_cmd_params params; } __packed; /* Max number of iterations after i2c NAK */ #define MAX_COUNT 3 /* * Max number of iterations after i2c NAK for 'long' commands * * We need this especially for sending TPM_READY, since the cleanup after the * transtion to the ready state may take some time, but it is unpredictable * how long it will take. */ #define MAX_COUNT_LONG 50 enum tis_access { TPM_ACCESS_VALID = 0x80, TPM_ACCESS_ACTIVE_LOCALITY = 0x20, TPM_ACCESS_REQUEST_PENDING = 0x04, TPM_ACCESS_REQUEST_USE = 0x02, }; enum tis_status { TPM_STS_VALID = 0x80, TPM_STS_COMMAND_READY = 0x40, TPM_STS_GO = 0x20, TPM_STS_DATA_AVAIL = 0x10, TPM_STS_DATA_EXPECT = 0x08, }; #endif