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

from m5.objects.Device import BasicPioDevice
from m5.objects.Serial import SerialDevice

class Uart(BasicPioDevice):
    type = 'Uart'
    abstract = True
    cxx_header = "dev/serial/uart.hh"
    cxx_class = 'gem5::Uart'
    platform = Param.Platform(Parent.any, "Platform this device is part of.")
    device = Param.SerialDevice(Parent.any, "The terminal")

class SimpleUart(Uart):
    type = 'SimpleUart'
    cxx_header = "dev/serial/simple.hh"
    cxx_class = 'gem5::SimpleUart'
    byte_order = Param.ByteOrder("little", "Device byte order")
    pio_size = Param.Addr(0x4, "Size of address range")
    end_on_eot = Param.Bool(False, "End the simulation when a EOT is "\
                            "received on the UART")

class Uart8250(Uart):
    type = 'Uart8250'
    cxx_header = "dev/serial/uart8250.hh"
    cxx_class = 'gem5::Uart8250'
    pio_size = Param.Addr(0x8, "Size of address range")

class RiscvUart8250(Uart8250):
    def generateDeviceTree(self, state):
        node = self.generateBasicPioDeviceNode(
            state, "uart", self.pio_addr, self.pio_size)
        platform = self.platform.unproxy(self)
        plic = platform.plic
        node.append(
            FdtPropertyWords("interrupts", [platform.uart_int_id]))
        node.append(
            FdtPropertyWords("clock-frequency", [0x384000]))
        node.append(
            FdtPropertyWords("interrupt-parent", state.phandle(plic)))
        node.appendCompatible(["ns8250"])
        yield node