From 139fdb3ed8f593b03f78ec9984467562331ef98c Mon Sep 17 00:00:00 2001 From: Ninad Palsule Date: Fri, 14 Apr 2023 17:07:54 -0500 Subject: tpm: Add support for TPM device over I2C bus MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Qemu already supports devices attached to ISA and sysbus. This drop adds support for the I2C bus attached TPM devices. I2C model only supports TPM2 protocol. This commit includes changes for the common code. - Added I2C emulation model. Logic was added in the model to temporarily cache the data as I2C interface works per byte basis. - New tpm type "tpm-tis-i2c" added for I2C support. The user has to provide this string on command line. Testing: TPM I2C device module is tested using SWTPM (software based TPM package). Qemu uses the rainier machine and is connected to swtpm over the socket interface. The command to start swtpm is as follows: $ swtpm socket --tpmstate dir=/tmp/mytpm1 \ --ctrl type=unixio,path=/tmp/mytpm1/swtpm-sock \ --tpm2 --log level=100 The command to start qemu is as follows: $ qemu-system-arm -M rainier-bmc -nographic \ -kernel ${IMAGEPATH}/fitImage-linux.bin \ -dtb ${IMAGEPATH}/aspeed-bmc-ibm-rainier.dtb \ -initrd ${IMAGEPATH}/obmc-phosphor-initramfs.rootfs.cpio.xz \ -drive file=${IMAGEPATH}/obmc-phosphor-image.rootfs.wic.qcow2,if=sd,index=2 \ -net nic -net user,hostfwd=:127.0.0.1:2222-:22,hostfwd=:127.0.0.1:2443-:443 \ -chardev socket,id=chrtpm,path=/tmp/mytpm1/swtpm-sock \ -tpmdev emulator,id=tpm0,chardev=chrtpm \ -device tpm-tis-i2c,tpmdev=tpm0,bus=aspeed.i2c.bus.12,address=0x2e Signed-off-by: Ninad Palsule Reviewed-by: Stefan Berger Tested-by: Stefan Berger Reviewed-by: Cédric Le Goater Reviewed-by: Joel Stanley Tested-by: Joel Stanley Message-id: 20230414220754.1191476-4-ninadpalsule@us.ibm.com --- hw/tpm/trace-events | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'hw/tpm/trace-events') diff --git a/hw/tpm/trace-events b/hw/tpm/trace-events index f171104..fa882df 100644 --- a/hw/tpm/trace-events +++ b/hw/tpm/trace-events @@ -36,3 +36,9 @@ tpm_spapr_do_crq_unknown_msg_type(uint8_t type) "Unknown message type 0x%02x" tpm_spapr_do_crq_unknown_crq(uint8_t raw1, uint8_t raw2) "unknown CRQ 0x%02x 0x%02x ..." tpm_spapr_post_load(void) "Delivering TPM response after resume" tpm_spapr_caught_response(uint32_t v) "Caught response to deliver after resume: %u bytes" + +# tpm_tis_i2c.c +tpm_tis_i2c_recv(uint8_t data) "TPM I2C read: 0x%X" +tpm_tis_i2c_send(uint8_t data) "TPM I2C write: 0x%X" +tpm_tis_i2c_event(const char *event) "TPM I2C event: %s" +tpm_tis_i2c_send_reg(const char *name, int reg) "TPM I2C write register: %s(0x%X)" -- cgit v1.1