diff options
Diffstat (limited to 'drivers/tpm/tpm_tis_infineon.h')
-rw-r--r-- | drivers/tpm/tpm_tis_infineon.h | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/drivers/tpm/tpm_tis_infineon.h b/drivers/tpm/tpm_tis_infineon.h new file mode 100644 index 00000000000..3b510d101e7 --- /dev/null +++ b/drivers/tpm/tpm_tis_infineon.h @@ -0,0 +1,146 @@ +/* + * 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 + +enum i2c_chip_type { + SLB9635, + SLB9645, + UNKNOWN, +}; + +struct tpm_chip { + int is_open; + int locality; + u32 vend_dev; + unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* msec */ + enum i2c_chip_type 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, +}; + +/* expected value for DIDVID register */ +#define TPM_TIS_I2C_DID_VID_9635 0x000b15d1L +#define TPM_TIS_I2C_DID_VID_9645 0x001a15d1L + +#define TPM_ACCESS(l) (0x0000 | ((l) << 4)) +#define TPM_STS(l) (0x0001 | ((l) << 4)) +#define TPM_DATA_FIFO(l) (0x0005 | ((l) << 4)) +#define TPM_DID_VID(l) (0x0006 | ((l) << 4)) + +#endif |