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from m5.objects.Device import BasicPioDevice
from m5.objects.Doorbell import Doorbell
from m5.params import *
from m5.proxy import *
from m5.util.fdthelper import *


class MhuDoorbell(Doorbell):
    type = "MhuDoorbell"
    abstract = True
    cxx_header = "dev/arm/css/mhu.hh"
    cxx_class = "gem5::MhuDoorbell"


class Scp2ApDoorbell(MhuDoorbell):
    type = "Scp2ApDoorbell"
    cxx_header = "dev/arm/css/mhu.hh"
    cxx_class = "gem5::Scp2ApDoorbell"

    interrupt = Param.ArmInterruptPin("Interrupt Pin")


class Ap2ScpDoorbell(MhuDoorbell):
    type = "Ap2ScpDoorbell"
    cxx_header = "dev/arm/css/mhu.hh"
    cxx_class = "gem5::Ap2ScpDoorbell"


# Message Handling Unit
class MHU(BasicPioDevice):
    type = "MHU"
    cxx_header = "dev/arm/css/mhu.hh"
    cxx_class = "gem5::MHU"
    pio_size = Param.Unsigned(0x1000, "MHU pio size")

    lowp_scp2ap = Param.Scp2ApDoorbell(
        "Low Priority doorbell channel for communications "
        "from the System Control Processor (SCP) to the "
        "Application Processor (AP)"
    )
    highp_scp2ap = Param.Scp2ApDoorbell(
        "High Priority doorbell channel for communications "
        "from the System Control Processor (SCP) to the "
        "Application Processor (AP)"
    )
    sec_scp2ap = Param.Scp2ApDoorbell(
        "Secure doorbell channel for communications "
        "from the System Control Processor (SCP) to the "
        "Application Processor (AP)"
    )

    lowp_ap2scp = Param.Ap2ScpDoorbell(
        "Low Priority doorbell channel for communications "
        "from the Application Processor (AP) to the "
        "System Control Processor (SCP)"
    )
    highp_ap2scp = Param.Ap2ScpDoorbell(
        "High Priority doorbell channel for communications "
        "from the Application Processor (AP) to the "
        "System Control Processor (SCP)"
    )
    sec_ap2scp = Param.Ap2ScpDoorbell(
        "Secure doorbell channel for communications "
        "from the Application Processor (AP) to the "
        "System Control Processor (SCP)"
    )

    scp = Param.Scp(Parent.any, "System Control Processor")

    def generateDeviceTree(self, state):
        node = FdtNode(f"mailbox@{int(self.pio_addr):x}")
        node.appendCompatible(["arm,mhu", "arm,primecell"])
        node.append(
            FdtPropertyWords(
                "reg",
                state.addrCells(self.pio_addr)
                + state.sizeCells(self.pio_size),
            )
        )
        node.append(FdtPropertyWords("#mbox-cells", 1))

        node.append(
            FdtPropertyWords(
                "interrupts",
                [
                    0,
                    int(self.lowp_scp2ap.interrupt.num) - 32,
                    1,
                    0,
                    int(self.highp_scp2ap.interrupt.num) - 32,
                    1,
                    0,
                    int(self.sec_scp2ap.interrupt.num) - 32,
                    1,
                ],
            )
        )

        realview = self._parent.unproxy(self)
        node.append(
            FdtPropertyWords(
                "clocks",
                [
                    state.phandle(realview.mcc.osc_peripheral),
                    state.phandle(realview.dcc.osc_smb),
                ],
            )
        )
        node.append(FdtPropertyStrings("clock-names", ["apb_pclk"]))

        node.appendPhandle(self)

        yield node