# Copyright (c) 2012-2013, 2017-2019 ARM Limited
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from m5.params import *
from m5.proxy import *
from m5.util.fdthelper import *
from m5.SimObject import SimObject

from m5.objects.Device import PioDevice, BasicPioDevice
from m5.objects.Platform import Platform

class BaseGic(PioDevice):
    type = 'BaseGic'
    abstract = True
    cxx_header = "dev/arm/base_gic.hh"

    # Used for DTB autogeneration
    _state = FdtState(addr_cells=0, interrupt_cells=3)

    platform = Param.Platform(Parent.any, "Platform this device is part of.")

    gicd_iidr = Param.UInt32(0,
        "Distributor Implementer Identification Register")
    gicd_pidr = Param.UInt32(0,
        "Peripheral Identification Register")
    gicc_iidr = Param.UInt32(0,
        "CPU Interface Identification Register")
    gicv_iidr = Param.UInt32(0,
        "VM CPU Interface Identification Register")

    def interruptCells(self, int_type, int_num, int_flag):
        """
        Interupt cells generation helper:
        Following specifications described in

        Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt
        """
        assert self._state.interrupt_cells == 3
        return [ int_type, int_num, int_flag ]

class ArmInterruptPin(SimObject):
    type = 'ArmInterruptPin'
    cxx_header = "dev/arm/base_gic.hh"
    cxx_class = "ArmInterruptPinGen"
    abstract = True

    platform = Param.Platform(Parent.any, "Platform with interrupt controller")
    num = Param.UInt32("Interrupt number in GIC")

class ArmSPI(ArmInterruptPin):
    type = 'ArmSPI'
    cxx_header = "dev/arm/base_gic.hh"
    cxx_class = "ArmSPIGen"

class ArmPPI(ArmInterruptPin):
    type = 'ArmPPI'
    cxx_header = "dev/arm/base_gic.hh"
    cxx_class = "ArmPPIGen"

class GicV2(BaseGic):
    type = 'GicV2'
    cxx_header = "dev/arm/gic_v2.hh"

    dist_addr = Param.Addr("Address for distributor")
    cpu_addr = Param.Addr("Address for cpu")
    cpu_size = Param.Addr(0x2000, "Size of cpu register bank")
    dist_pio_delay = Param.Latency('10ns', "Delay for PIO r/w to distributor")
    cpu_pio_delay = Param.Latency('10ns', "Delay for PIO r/w to cpu interface")
    int_latency = Param.Latency('10ns', "Delay for interrupt to get to CPU")
    it_lines = Param.UInt32(128, "Number of interrupt lines supported (max = 1020)")
    gem5_extensions = Param.Bool(False, "Enable gem5 extensions")

class Gic400(GicV2):
    """
    As defined in:
    "ARM Generic Interrupt Controller Architecture" version 2.0
    "CoreLink GIC-400 Generic Interrupt Controller" revision r0p1
    """
    gicd_pidr = 0x002bb490
    gicd_iidr = 0x0200143B
    gicc_iidr = 0x0202143B

    # gicv_iidr same as gicc_idr
    gicv_iidr = gicc_iidr

class Gicv2mFrame(SimObject):
    type = 'Gicv2mFrame'
    cxx_header = "dev/arm/gic_v2m.hh"
    spi_base = Param.UInt32(0x0, "Frame SPI base number");
    spi_len = Param.UInt32(0x0, "Frame SPI total number");
    addr = Param.Addr("Address for frame PIO")

class Gicv2m(PioDevice):
    type = 'Gicv2m'
    cxx_header = "dev/arm/gic_v2m.hh"

    pio_delay = Param.Latency('10ns', "Delay for PIO r/w")
    gic = Param.BaseGic(Parent.any, "Gic on which to trigger interrupts")
    frames = VectorParam.Gicv2mFrame([], "Power of two number of frames")

class VGic(PioDevice):
    type = 'VGic'
    cxx_header = "dev/arm/vgic.hh"
    gic = Param.BaseGic(Parent.any, "Gic to use for interrupting")
    platform = Param.Platform(Parent.any, "Platform this device is part of.")
    vcpu_addr = Param.Addr(0, "Address for vcpu interfaces")
    hv_addr = Param.Addr(0, "Address for hv control")
    pio_delay = Param.Latency('10ns', "Delay for PIO r/w")
   # The number of list registers is not currently configurable at runtime.
    maint_int = Param.UInt32("HV maintenance interrupt number")

    # gicv_iidr same as gicc_idr
    gicv_iidr = Param.UInt32(Self.gic.gicc_iidr,
        "VM CPU Interface Identification Register")

    def generateDeviceTree(self, state):
        gic = self.gic.unproxy(self)

        node = FdtNode("interrupt-controller")
        node.appendCompatible(["gem5,gic", "arm,cortex-a15-gic",
                               "arm,cortex-a9-gic"])
        node.append(gic._state.interruptCellsProperty())
        node.append(gic._state.addrCellsProperty())
        node.append(FdtProperty("interrupt-controller"))

        regs = (
            state.addrCells(gic.dist_addr) +
            state.sizeCells(0x1000) +
            state.addrCells(gic.cpu_addr) +
            state.sizeCells(0x1000) +
            state.addrCells(self.hv_addr) +
            state.sizeCells(0x2000) +
            state.addrCells(self.vcpu_addr) +
            state.sizeCells(0x2000) )

        node.append(FdtPropertyWords("reg", regs))
        node.append(FdtPropertyWords("interrupts",
                                     [1, int(self.maint_int)-16, 0xf04]))

        node.appendPhandle(gic)

        yield node

class Gicv3Its(BasicPioDevice):
    type = 'Gicv3Its'
    cxx_header = "dev/arm/gic_v3_its.hh"

    dma = RequestPort("DMA port")
    pio_size = Param.Unsigned(0x20000, "Gicv3Its pio size")

    # CIL [36] = 0: ITS supports 16-bit CollectionID
    # Devbits [17:13] = 0b100011: ITS supports 23 DeviceID bits
    # ID_bits [12:8] = 0b11111: ITS supports 31 EventID bits
    gits_typer = Param.UInt64(0x30023F01, "GITS_TYPER RO value")

    def generateDeviceTree(self, state):
        node = self.generateBasicPioDeviceNode(state, "gic-its", self.pio_addr,
                                               self.pio_size)
        node.appendCompatible(["arm,gic-v3-its"])
        node.append(FdtProperty("msi-controller"))
        node.append(FdtPropertyWords("#msi-cells", [1]))

        return node

class Gicv3(BaseGic):
    type = 'Gicv3'
    cxx_header = "dev/arm/gic_v3.hh"

    # Used for DTB autogeneration
    _state = FdtState(addr_cells=2, size_cells=2, interrupt_cells=3)

    its = Param.Gicv3Its(NULL, "GICv3 Interrupt Translation Service")

    dist_addr = Param.Addr("Address for distributor")
    dist_pio_delay = Param.Latency('10ns', "Delay for PIO r/w to distributor")
    redist_addr = Param.Addr("Address for redistributors")
    redist_pio_delay = Param.Latency('10ns',
            "Delay for PIO r/w to redistributors")
    it_lines = Param.UInt32(1020,
            "Number of interrupt lines supported (max = 1020)")

    maint_int = Param.ArmInterruptPin(
        "HV maintenance interrupt."
        "ARM strongly recommends that maintenance interrupts "
        "are configured to use INTID 25 (PPI Interrupt).")

    cpu_max = Param.Unsigned(256,
        "Maximum number of PE. This is affecting the maximum number of "
        "redistributors")

    gicv4 = Param.Bool(True, "GICv4 extension available")

    def interruptCells(self, int_type, int_num, int_flag):
        """
        Interupt cells generation helper:
        Following specifications described in

        Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt
        """
        prop = self._state.interruptCells(0)
        assert len(prop) >= 3
        prop[0] = int_type
        prop[1] = int_num
        prop[2] = int_flag
        return prop

    def generateDeviceTree(self, state):
        node = FdtNode("interrupt-controller")
        node.appendCompatible(["arm,gic-v3"])
        node.append(self._state.interruptCellsProperty())
        node.append(self._state.addrCellsProperty())
        node.append(self._state.sizeCellsProperty())
        node.append(FdtProperty("ranges"))
        node.append(FdtProperty("interrupt-controller"))

        redist_stride = 0x40000 if self.gicv4 else 0x20000
        node.append(FdtPropertyWords("redistributor-stride",
            state.sizeCells(redist_stride)))

        regs = (
            state.addrCells(self.dist_addr) +
            state.sizeCells(0x10000) +
            state.addrCells(self.redist_addr) +
            state.sizeCells(0x2000000) )

        node.append(FdtPropertyWords("reg", regs))
        node.append(FdtPropertyWords("interrupts",
            self.interruptCells(1, int(self.maint_int.num)-16, 0xf04)))

        node.appendPhandle(self)

        # Generate the ITS device tree if instantiated
        if self.its != NULL:
            node.append(self.its.generateDeviceTree(self._state))

        yield node