tree 798a6707235ac2a9c2ed9566988e33415db3df80
parent 5faf17db909f4a9a93811fd784568aeabc09d206
author Caleb Connolly <caleb.connolly@linaro.org> 1694558338 +0100
committer Caleb Connolly <caleb.connolly@linaro.org> 1701908582 +0000
gpgsig -----BEGIN PGP SIGNATURE-----
 
 iHUEABEIAB0WIQQXyKY5gq3TPyi3oNB5MEWfuTAyFwUCZXEQZgAKCRB5MEWfuTAy
 F1/kAP9buFRE3zIldeJbxm7ZI0oLWf1mWQDIWabdtMg3vND8kQD/X0KCvcIoBtts
 cdu4ClsGJ1nSouWVY39JB4aM5li7FnU=
 =qV5k
 -----END PGP SIGNATURE-----

iommu: add arm-smmu

Add a basic implementation of the ARM SMMU. This driver is intended for
use on platforms where the SMMU may have been configured by a previous
bootloader, it keeps all existing stream mappings and only creates new
ones for stream ids that aren't already configured.

This is needed for Qualcomm platforms where a previous bootloader stage
initialised context banks for some stream IDs (e.g. UFS) but not for
other peripherals like USB.

An overly zealous hypervisor prevents us from creating bypass streams,
so we rely on the fact that virtual and physical addresses are the same
and create basic translation type context banks.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>