esiaccel.bsp.common.ChannelMMIO Class Reference

Inheritance diagram for esiaccel.bsp.common.ChannelMMIO:

Collaboration diagram for esiaccel.bsp.common.ChannelMMIO:

Public Member Functions
	generate (ports, esi._ServiceGeneratorBundles bundles)

Static Public Member Functions
Tuple[Dict[int, AssignableSignal], int]	build_table (bundles)
	build_read (ports, int manifest_loc, Dict[int, AssignableSignal] table)
Tuple[BitsSignal, ChannelSignal]	build_addr_read (ChannelSignal read_addr_chan, int num_clients, int manifest_loc)

Static Public Attributes
	clk = Clock()
	rst = Input(Bits(1))
	cmd = Input(esi.MMIO.read_write.type)
	reset_request = Output(Bits(1))
int	RegisterSpace = 0x400
int	RegisterSpaceBits = RegisterSpace.bit_length() - 1
int	AddressMask = 0x3FF
int	initial_offset = RegisterSpace

Detailed Description

MMIO service implementation with MMIO bundle interfaces. Should be
relatively easy to adapt to physical interfaces by wrapping the wires to
channels then bundles. Allows the implementation to be shared and (hopefully)
platform independent.

Whether or not to support unaligned accesses is up to the clients. The header
and manifest do not support unaligned accesses and throw away the lower three
bits.

Only allows for one outstanding request at a time. If a client doesn't return
a response, the MMIO service will hang. TODO: add some kind of timeout.

Implementation-defined MMIO layout:
  - 0x0: 0 constant
  - 0x8: Magic number (0x207D98E5_E5100E51)
  - 0x12: ESI version number (0)
  - 0x18: Location of the manifest ROM (absolute address)

  - 0x400: Start of MMIO space for requests. Mapping is contained in the
           manifest so can be dynamically queried.

  - addr(Manifest ROM) + 0: Size of compressed manifest
  - addr(Manifest ROM) + 8: Start of compressed manifest

This layout _should_ be pretty standard, but different BSPs may have various
different restrictions. Any BSP which uses this service implementation will
have this layout, possibly with an offset or address window.

Definition at line 422 of file common.py.

Member Function Documentation

build_addr_read()

Tuple[BitsSignal, ChannelSignal] esiaccel.bsp.common.ChannelMMIO.build_addr_read ( ChannelSignal  read_addr_chan, int  num_clients, int  manifest_loc  )

static

Build a channel for the address read request. Returns the index to select
the client and a channel for the masked address to be passed to the
clients.

Definition at line 579 of file common.py.

References wrap().

build_read()

esiaccel.bsp.common.ChannelMMIO.build_read (   ports, int  manifest_loc, Dict[int, AssignableSignal]  table  )

static

Builds the read side of the MMIO service.

Definition at line 511 of file common.py.

References esiaccel.bsp.common.ChannelDemuxTree_HalfStage_ReadyBlocking(), and esiaccel.bsp.common.HeaderMMIO().

build_table()

Tuple[Dict[int, AssignableSignal], int] esiaccel.bsp.common.ChannelMMIO.build_table (   bundles )

static

Build a table of read and write addresses to BundleSignals.

Definition at line 483 of file common.py.

generate()

esiaccel.bsp.common.ChannelMMIO.generate	(		ports,
		esi._ServiceGeneratorBundles	bundles
	)

Definition at line 477 of file common.py.

Member Data Documentation

AddressMask

int esiaccel.bsp.common.ChannelMMIO.AddressMask = 0x3FF

static

Definition at line 471 of file common.py.

clk

esiaccel.bsp.common.ChannelMMIO.clk = Clock()

static

Definition at line 452 of file common.py.

Referenced by esiaccel.bsp.common.ESI_Manifest_ROM_Wrapper.build().

cmd

esiaccel.bsp.common.ChannelMMIO.cmd = Input(esi.MMIO.read_write.type)

static

Definition at line 455 of file common.py.

initial_offset

int esiaccel.bsp.common.ChannelMMIO.initial_offset = RegisterSpace

static

Definition at line 474 of file common.py.

RegisterSpace

int esiaccel.bsp.common.ChannelMMIO.RegisterSpace = 0x400

static

Definition at line 469 of file common.py.

RegisterSpaceBits

int esiaccel.bsp.common.ChannelMMIO.RegisterSpaceBits = RegisterSpace.bit_length() - 1

static

Definition at line 470 of file common.py.

reset_request

esiaccel.bsp.common.ChannelMMIO.reset_request = Output(Bits(1))

static

Definition at line 459 of file common.py.

rst

esiaccel.bsp.common.ChannelMMIO.rst = Input(Bits(1))

static

Definition at line 453 of file common.py.

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The documentation for this class was generated from the following file:

• /home/runner/work/circt-www/circt-www/circt_src/lib/Dialect/ESI/runtime/python/esiaccel/bsp/common.py