# Copyright (c) 2020 ARM Limited
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from m5.params import *
from m5.proxy import *
from m5.objects.Scp import Scp
from m5.objects.Doorbell import Doorbell
from m5.util.fdthelper import *
from m5.SimObject import SimObject


class ScmiChannel(SimObject):
    """
    Unidirectional channel
    """

    type = "ScmiChannel"
    cxx_header = "dev/arm/css/scmi_platform.hh"
    cxx_class = "gem5::scmi::VirtualChannel"
    shmem_range = Param.AddrRange(
        "Virtual channel's shared memory address range"
    )
    phys_id = Param.Unsigned(4, "Physical slot of the channel")
    virt_id = Param.Unsigned(
        0, "Virtual slot of the channel (within the physical)"
    )
    doorbell = Param.Doorbell(
        "This is the doorbell used to notify the SCMI platform"
    )

    def __init__(self, shmem, *args, **kwargs):
        super().__init__(**kwargs)

        def shmemGenerator(state):
            shmem_node = FdtNode("scp-shmem@%x" % 0)
            shmem_node.appendCompatible(["arm,scmi-shmem"])
            shmem_node.append(
                FdtPropertyWords(
                    "reg", state.addrCells(0) + state.sizeCells(0x200)
                )
            )
            # shmem_node.appendPhandle(self._parent.unproxy(self).channel)
            shmem_node.appendPhandle("scmi_virt" + str(self.virt_id))
            return shmem_node

        self._shmem = shmem
        self._shmem.addSubnodeGenerator(shmemGenerator)


class ScmiAgentChannel(ScmiChannel):
    """
    This is a Agent to Platform channel (The agent is the initiator)
    """

    type = "ScmiAgentChannel"
    cxx_header = "dev/arm/css/scmi_platform.hh"
    cxx_class = "gem5::scmi::AgentChannel"


class ScmiPlatformChannel(ScmiChannel):
    """
    This is a Platform to Agent channel (The platform is the initiator)
    """

    type = "ScmiPlatformChannel"
    cxx_header = "dev/arm/css/scmi_platform.hh"
    cxx_class = "gem5::scmi::PlatformChannel"


class ScmiCommunication(SimObject):
    """
    The SCMI Communication class models a bidirectional
    communication between the SCMI platform and the agent.
    As such it has a ScmiAgentChannel and a ScmiPlatformChannel
    object as members.
    """

    type = "ScmiCommunication"
    cxx_header = "dev/arm/css/scmi_platform.hh"
    cxx_class = "gem5::scmi::Communication"

    agent_channel = Param.ScmiAgentChannel("Agent to Platform channel")
    platform_channel = Param.ScmiPlatformChannel("Platform to Agent channel")


class ScmiPlatform(Scp):
    type = "ScmiPlatform"
    cxx_header = "dev/arm/css/scmi_platform.hh"
    cxx_class = "gem5::scmi::Platform"

    comms = VectorParam.ScmiCommunication([], "SCMI Communications")
    agents = VectorParam.String(
        ["OSPM"], "Vector of SCMI agents (names) in the system"
    )

    sys = Param.System(Parent.any, "System object parameter")
    dma = MasterPort("DMA port")

    # Protocol params
    base_vendor = Param.String(
        "arm", "Return string for the Base protocol DISCOVER_VENDOR command"
    )
    base_subvendor = Param.String(
        "gem5",
        "Return string for the Base protocol DISCOVER_SUBVENDOR command",
    )
    base_impl_version = Param.Unsigned(
        0,
        "Return value for the Base protocol "
        "DISCOVER_IMPLEMENTATION_VERSION command",
    )

    def generateDeviceTree(self, state):
        scmi_node = self.generateScmiNode(state)

        fw_node = FdtNode("firmware")
        fw_node.append(scmi_node)
        yield fw_node

    def generateScmiNode(self, state):
        node = FdtNode("scmi")
        node.appendCompatible(["arm,scmi"])

        mbox_phandle = state.phandle(self._parent.unproxy(self).mailbox)
        shmem_phandles = []
        for comm in self.unproxy(self).comms:
            shmem_phandles.append(
                state.phandle("scmi_virt" + str(comm.agent_channel.virt_id))
            )
            shmem_phandles.append(
                state.phandle("scmi_virt" + str(comm.platform_channel.virt_id))
            )

        phys_channel = 1  # HP-NonSecure
        node.append(FdtPropertyWords("mboxes", [mbox_phandle, phys_channel]))
        node.append(FdtPropertyWords("shmem", shmem_phandles))
        return node