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authorDuncan Laurie <dlaurie@chromium.org>2020-12-07 17:20:16 +0300
committerJarkko Sakkinen <jarkko@kernel.org>2021-02-16 11:40:27 +0300
commit3a253caaad11cf4ac371dd6549a9ec6e2f2152fa (patch)
treef1c95b03b6483bc6f8fcb09e21ce420b8d271961 /drivers/char/tpm/Kconfig
parentd87719c14464825aee86d5f193c4e09285cca0b3 (diff)
downloadlinux-3a253caaad11cf4ac371dd6549a9ec6e2f2152fa.tar.xz
char: tpm: add i2c driver for cr50
Add TPM 2.0 compatible I2C interface for chips with cr50 firmware. The firmware running on the currently supported H1 MCU requires a special driver to handle its specific protocol, and this makes it unsuitable to use tpm_tis_core_* and instead it must implement the underlying TPM protocol similar to the other I2C TPM drivers. - All 4 bytes of status register must be read/written at once. - FIFO and burst count is limited to 63 and must be drained by AP. - Provides an interrupt to indicate when read response data is ready and when the TPM is finished processing write data. This driver is based on the existing infineon I2C TPM driver, which most closely matches the cr50 i2c protocol behavior. Signed-off-by: Duncan Laurie <dlaurie@chromium.org> Signed-off-by: Stephen Boyd <swboyd@chromium.org> Signed-off-by: Fabien Lahoudere <fabien.lahoudere@collabora.com> Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com> Tested-by: Adrian Ratiu <adrian.ratiu@collabora.com> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Diffstat (limited to 'drivers/char/tpm/Kconfig')
-rw-r--r--drivers/char/tpm/Kconfig10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index a18c314da211..4308f9ca7a43 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -86,6 +86,16 @@ config TCG_TIS_SYNQUACER
To compile this driver as a module, choose M here;
the module will be called tpm_tis_synquacer.
+config TCG_TIS_I2C_CR50
+ tristate "TPM Interface Specification 2.0 Interface (I2C - CR50)"
+ depends on I2C
+ select TCG_CR50
+ help
+ This is a driver for the Google cr50 I2C TPM interface which is a
+ custom microcontroller and requires a custom i2c protocol interface
+ to handle the limitations of the hardware. To compile this driver
+ as a module, choose M here; the module will be called tcg_tis_i2c_cr50.
+
config TCG_TIS_I2C_ATMEL
tristate "TPM Interface Specification 1.2 Interface (I2C - Atmel)"
depends on I2C