src/dev/serial/Uart.py

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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