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# SPDX-License-Identifier: GPL-2.0-only
#
# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.rst.
#
menu "Qualcomm firmware drivers"
config QCOM_SCM
select QCOM_TZMEM
tristate
config QCOM_TZMEM
tristate
select GENERIC_ALLOCATOR
choice
prompt "TrustZone interface memory allocator mode"
depends on QCOM_TZMEM
default QCOM_TZMEM_MODE_GENERIC
help
Selects the mode of the memory allocator providing memory buffers of
suitable format for sharing with the TrustZone. If in doubt, select
'Generic'.
config QCOM_TZMEM_MODE_GENERIC
bool "Generic"
help
Use the generic allocator mode. The memory is page-aligned, non-cachable
and physically contiguous.
config QCOM_TZMEM_MODE_SHMBRIDGE
bool "SHM Bridge"
help
Use Qualcomm Shared Memory Bridge. The memory has the same alignment as
in the 'Generic' allocator but is also explicitly marked as an SHM Bridge
buffer.
With this selected, all buffers passed to the TrustZone must be allocated
using the TZMem allocator or else the TrustZone will refuse to use them.
endchoice
config QCOM_SCM_DOWNLOAD_MODE_DEFAULT
bool "Qualcomm download mode enabled by default"
depends on QCOM_SCM
help
A device with "download mode" enabled will upon an unexpected
warm-restart enter a special debug mode that allows the user to
"download" memory content over USB for offline postmortem analysis.
The feature can be enabled/disabled on the kernel command line.
Say Y here to enable "download mode" by default.
config QCOM_QSEECOM
bool "Qualcomm QSEECOM interface driver"
depends on QCOM_SCM=y
select AUXILIARY_BUS
help
Various Qualcomm SoCs have a Secure Execution Environment (SEE) running
in the Trust Zone. This module provides an interface to that via the
QSEECOM mechanism, using SCM calls.
The QSEECOM interface allows, among other things, access to applications
running in the SEE. An example of such an application is 'uefisecapp',
which is required to access UEFI variables on certain systems. If
selected, the interface will also attempt to detect and register client
devices for supported applications.
Select Y here to enable the QSEECOM interface driver.
config QCOM_QSEECOM_UEFISECAPP
bool "Qualcomm SEE UEFI Secure App client driver"
depends on QCOM_QSEECOM
depends on EFI
help
Various Qualcomm SoCs do not allow direct access to EFI variables.
Instead, these need to be accessed via the UEFI Secure Application
(uefisecapp), residing in the Secure Execution Environment (SEE).
This module provides a client driver for uefisecapp, installing efivar
operations to allow the kernel accessing EFI variables, and via that also
provide user-space with access to EFI variables via efivarfs.
Select Y here to provide access to EFI variables on the aforementioned
platforms.
endmenu
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