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from m5.params import *
from m5.proxy import *
from m5.util.fdthelper import *

from m5.objects.ClockedObject import ClockedObject

class PioDevice(ClockedObject):
    type = 'PioDevice'
    cxx_header = "dev/io_device.hh"
    cxx_class = 'gem5::PioDevice'
    abstract = True

    pio = ResponsePort("Programmed I/O port")
    system = Param.System(Parent.any, "System this device is part of")

    def generateBasicPioDeviceNode(self, state, name, pio_addr,
                                   size, interrupts = None):
        node = FdtNode("%s@%x" % (name, int(pio_addr)))
        node.append(FdtPropertyWords("reg",
            state.addrCells(pio_addr) +
            state.sizeCells(size) ))

        if interrupts:
            if any([i.num < 32 for i in interrupts]):
                raise(("Interrupt number smaller than 32 "+
                       " in PioDevice %s") % name)

            gic = self._parent.unproxy(self).gic

            node.append(FdtPropertyWords("interrupts", sum(
                [ i.generateFdtProperty(gic) for i in interrupts], []) ))

        return node

class BasicPioDevice(PioDevice):
    type = 'BasicPioDevice'
    cxx_header = "dev/io_device.hh"
    cxx_class = 'gem5::BasicPioDevice'
    abstract = True

    pio_addr = Param.Addr("Device Address")
    pio_latency = Param.Latency('100ns', "Programmed IO latency")

class DmaDevice(PioDevice):
    type = 'DmaDevice'
    cxx_header = "dev/dma_device.hh"
    cxx_class = 'gem5::DmaDevice'
    abstract = True

    dma = RequestPort("DMA port")

    _iommu = None

    sid = Param.Unsigned(0,
        "Stream identifier used by an IOMMU to distinguish amongst "
        "several devices attached to it")
    ssid = Param.Unsigned(0,
        "Substream identifier used by an IOMMU to distinguish amongst "
        "several devices attached to it")

    def addIommuProperty(self, state, node):
        """
        This method takes an FdtState and a FdtNode as parameters, and
        it is appending a "iommus = <>" property in case the DmaDevice
        is attached to an IOMMU.
        This method is necessary for autogenerating a binding between
        a dma device and the iommu.
        """
        if self._iommu is not None:
            node.append(FdtPropertyWords("iommus",
                [ state.phandle(self._iommu), self.sid ]))

class IsaFake(BasicPioDevice):
    type = 'IsaFake'
    cxx_header = "dev/isa_fake.hh"
    cxx_class = 'gem5::IsaFake'

    pio_size = Param.Addr(0x8, "Size of address range")
    ret_data8 = Param.UInt8(0xFF, "Default data to return")
    ret_data16 = Param.UInt16(0xFFFF, "Default data to return")
    ret_data32 = Param.UInt32(0xFFFFFFFF, "Default data to return")
    ret_data64 = Param.UInt64(0xFFFFFFFFFFFFFFFF, "Default data to return")
    ret_bad_addr = Param.Bool(False, "Return pkt status bad address on access")
    update_data = Param.Bool(False, "Update the data that is returned on writes")
    warn_access = Param.String("", "String to print when device is accessed")
    fake_mem = Param.Bool(False,
      "Is this device acting like a memory and thus may get a cache line sized req")

class BadAddr(IsaFake):
    pio_addr = 0
    ret_bad_addr = Param.Bool(True, "Return pkt status bad address on access")