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IPC (Inter Process Communication) support for communication with DELTA coprocessor firmware using rpmsg kernel framework. Based on 4 services open/set_stream/decode/close and their associated rpmsg messages. The messages structures are duplicated on both host and firmware side and are packed (use only of 32 bits size fields in messages structures to ensure packing). Each service is synchronous; service returns only when firmware acknowledges the associated command message. Due to significant parameters size exchanged from host to copro, parameters are not inserted in rpmsg messages. Instead, parameters are stored in physical memory shared between host and coprocessor. Memory is non-cacheable, so no special operation is required to ensure memory coherency on host and on coprocessor side. Multi-instance support and re-entrance are ensured using host_hdl and copro_hdl in message header exchanged between both host and coprocessor. This avoids to manage tables on both sides to get back the running context of each instance. Acked-by: Peter Griffin <peter.griffin@linaro.org> Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> |
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| bdisp | ||
| c8sectpfe | ||
| delta | ||
| hva | ||