Device.py revision 13930:c5e728ccd2e2 
1# Copyright (c) 2012-2016 ARM Limited
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13# Copyright (c) 2005-2007 The Regents of The University of Michigan
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38#
39# Authors: Nathan Binkert
40#          Glenn Bergmans
41
42from m5.params import *
43from m5.proxy import *
44from m5.util.fdthelper import *
45
46from m5.objects.ClockedObject import ClockedObject
47
48class PioDevice(ClockedObject):
49    type = 'PioDevice'
50    cxx_header = "dev/io_device.hh"
51    abstract = True
52    pio = SlavePort("Programmed I/O port")
53    system = Param.System(Parent.any, "System this device is part of")
54
55    def generateBasicPioDeviceNode(self, state, name, pio_addr,
56                                   size, interrupts = None):
57        node = FdtNode("%s@%x" % (name, long(pio_addr)))
58        node.append(FdtPropertyWords("reg",
59            state.addrCells(pio_addr) +
60            state.sizeCells(size) ))
61
62        if interrupts:
63            if any([i < 32 for i in interrupts]):
64                raise(("Interrupt number smaller than 32 "+
65                       " in PioDevice %s") % name)
66
67            # subtracting 32 because Linux assumes that SPIs start at 0, while
68            # gem5 uses the internal GIC numbering (SPIs start at 32)
69            node.append(FdtPropertyWords("interrupts", sum(
70                [[0, i  - 32, 4] for i in interrupts], []) ))
71
72        return node
73
74class BasicPioDevice(PioDevice):
75    type = 'BasicPioDevice'
76    cxx_header = "dev/io_device.hh"
77    abstract = True
78    pio_addr = Param.Addr("Device Address")
79    pio_latency = Param.Latency('100ns', "Programmed IO latency")
80
81class DmaDevice(PioDevice):
82    type = 'DmaDevice'
83    cxx_header = "dev/dma_device.hh"
84    abstract = True
85    dma = MasterPort("DMA port")
86
87    sid = Param.Unsigned(0,
88        "Stream identifier used by an IOMMU to distinguish amongst "
89        "several devices attached to it")
90    ssid = Param.Unsigned(0,
91        "Substream identifier used by an IOMMU to distinguish amongst "
92        "several devices attached to it")
93
94
95class IsaFake(BasicPioDevice):
96    type = 'IsaFake'
97    cxx_header = "dev/isa_fake.hh"
98    pio_size = Param.Addr(0x8, "Size of address range")
99    ret_data8 = Param.UInt8(0xFF, "Default data to return")
100    ret_data16 = Param.UInt16(0xFFFF, "Default data to return")
101    ret_data32 = Param.UInt32(0xFFFFFFFF, "Default data to return")
102    ret_data64 = Param.UInt64(0xFFFFFFFFFFFFFFFF, "Default data to return")
103    ret_bad_addr = Param.Bool(False, "Return pkt status bad address on access")
104    update_data = Param.Bool(False, "Update the data that is returned on writes")
105    warn_access = Param.String("", "String to print when device is accessed")
106    fake_mem = Param.Bool(False,
107      "Is this device acting like a memory and thus may get a cache line sized req")
108
109class BadAddr(IsaFake):
110    pio_addr = 0
111    ret_bad_addr = Param.Bool(True, "Return pkt status bad address on access")
112
113
114