[PATCH v2 6/8] accel/qaic: Add mhi_qaic_cntl

[Stanislaw Gruszka]

On Mon, Feb 06, 2023 at 08:41:43AM -0700, Jeffrey Hugo wrote:
> From: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy at quicinc.com>
> 
> Some of the MHI channels for an AIC100 device need to be routed to
> userspace so that userspace can communicate directly with QSM.  The MHI
> bus does not support this, and while the WWAN subsystem does (for the same
> reasons), AIC100 is not a WWAN device.  Also, MHI is not something that
> other accelerators are expected to share, thus an accel subsystem function
> that meets this usecase is unlikely.
> 
> Create a QAIC specific MHI userspace shim that exposes these channels.
> 
> Start with QAIC_SAHARA which is required to boot AIC100 and is consumed by
> the kickstart application as documented in aic100.rst
> 
> Each AIC100 instance (currently, up to 16) in a system will create a
> chardev for QAIC_SAHARA.  This chardev will be found as
> /dev/<mhi instance>_QAIC_SAHARA
> For example - /dev/mhi0_QAIC_SAHARA
> 
> Signed-off-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy at quicinc.com>
> Signed-off-by: Jeffrey Hugo <quic_jhugo at quicinc.com>
> Reviewed-by: Carl Vanderlip <quic_carlv at quicinc.com>

Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka at linux.intel.com>