Documentation/mhi/mhi.rst

29 which are mapped to the host memory space by the peripheral buses like PCIe.
30 Following are the major components of MMIO register space:
34 MHI BHI registers: BHI (Boot Host Interface) registers are used by the host
41 (DB) registers are used by the host to notify the device when new events are
50 All data structures used by MHI are in the host system memory. Using the
52 structures and data buffers in the host system memory regions are mapped for
55 Channel context array: All channel configurations are organized in channel
59 transfer rings are organized as a circular queue of Transfer Descriptors (TD).
61 Event context array: All event configurations are organized in the event context
67 Command context array: All command configurations are organized in command
71 rings are organized as a circular queue of Command Descriptors (CD).
76 MHI channels are logical, unidirectional data pipes between a host and a device.
90 Transfers between the host and device are organized by channels and defined by
91 Transfer Descriptors (TD). TDs are managed through transfer rings, which are
116 Events from the device to host are organized in event rings and defined by Event
117 Descriptors (ED). Event rings are used by the device to report events such as
119 to the host. Event rings are the array of EDs that resides in the host
205 Following are the sequence of operations performed by the host to transfer