src/dev/arm/css/MHU.py

# Copyright (c) 2020 ARM Limited
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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"

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

    interrupt = Param.ArmInterruptPin("Interrupt Pin")

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

# Message Handling Unit
class MHU(BasicPioDevice):
    type = 'MHU'
    cxx_header = "dev/arm/css/mhu.hh"
    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("mailbox@%x" % long(self.pio_addr))
        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