There is an issue on the SHI hardware peripheral to detect CS
rising/failing with bits CSnFE/CSnRE in the EVSTAT2 register in
npcx9m7fb chip. This commit workarounds it by using MIWU to detect the
CS rising and failing.
Signed-off-by: Tom Chang <CHChang19@nuvoton.com>
Signed-off-by: Jun Lin <CHLin56@nuvoton.com>
Select PINCTRL subsystem by drivers which require it.
Prevent the need from enabling this symbol at board or soc level.
Signed-off-by: Erwan Gouriou <erwan.gouriou@st.com>
The original SHI module only has one output FIFO buffer. It costs a lot
when the driver has to send/change the protocol control code because it
must fill out all 128 bytes of output FIFO. In npcx4, we introduce
another output buffer in 1-byte depth. These two buffers can switch back
and forth during the transaction. We can use the single-byte buffer
to send the control code and the 128-byte FIFO to send the data payload.
It helps improve the SHI driver's efficiency.
Signed-off-by: Jun Lin <CHLin56@nuvoton.com>
Add support for SPI host command backend for STM32 chips family.
Unfortunately, the current SPI API can't be used to handle the host
commands communication. The main issues are unknown command size sent
by the host(the SPI transaction sends/receives specific number of bytes)
and need to constant sending status byte(the SPI module is enabled and
disabled per transaction). Thus the SPI backend includes basic SPI STM32
driver adjusted to host command specification.
Signed-off-by: Dawid Niedzwiecki <dawidn@google.com>
Add a new backend for Host Commands that uses UART. The backend bases
asynchronous UART API.
The UART backend is mainly used by FPMCU.
Signed-off-by: Dawid Niedzwiecki <dawidn@google.com>
Rework the Host Command support. It includes:
-change API to backend
-change a way of defining rx and tx buffers
-fix synchronization between the handler and backend layer
-simplify the HC handler
Signed-off-by: Dawid Niedzwiecki <dawidn@google.com>
Follow naming pattern in the subsystems(logging or shell) and name
the layer between generic handler and peripheral driver "backend".
The name doesn't suit that well to the SHI backend, because there isn't
SHI API itself and the SHI interface is used only for the host
communication. So the backend code includes the peripheral driver itself.
Signed-off-by: Dawid Niedzwiecki <dawidn@google.com>
