# This file is Copyright (c) 2017 Serge 'q3k' Bazanski <serge@bazanski.pl>
# License: BSD

from litex.build.generic_platform import *
from litex.build.lattice import LatticePlatform
from litex.build.lattice.programmer import LatticeProgrammer

# IOs ----------------------------------------------------------------------------------------------

_io = [
    ("clk100", 0, Pins("P3"), IOStandard("LVDS")),
    ("rst_n", 0, Pins("T1"), IOStandard("LVCMOS33")),

    ("user_led", 0, Pins("E16"), IOStandard("LVCMOS25")),
    ("user_led", 1, Pins("D17"), IOStandard("LVCMOS25")),
    ("user_led", 2, Pins("D18"), IOStandard("LVCMOS25")),
    ("user_led", 3, Pins("E18"), IOStandard("LVCMOS25")),
    ("user_led", 4, Pins("F17"), IOStandard("LVCMOS25")),
    ("user_led", 5, Pins("F18"), IOStandard("LVCMOS25")),
    ("user_led", 6, Pins("E17"), IOStandard("LVCMOS25")),
    ("user_led", 7, Pins("F16"), IOStandard("LVCMOS25")),

    ("user_dip_btn", 0, Pins("H2"), IOStandard("LVCMOS15")),
    ("user_dip_btn", 1, Pins("K3"), IOStandard("LVCMOS15")),
    ("user_dip_btn", 2, Pins("G3"), IOStandard("LVCMOS15")),
    ("user_dip_btn", 3, Pins("F2"), IOStandard("LVCMOS15")),
    ("user_dip_btn", 4, Pins("J18"), IOStandard("LVCMOS25")),
    ("user_dip_btn", 5, Pins("K18"), IOStandard("LVCMOS25")),
    ("user_dip_btn", 6, Pins("K19"), IOStandard("LVCMOS25")),
    ("user_dip_btn", 7, Pins("K20"), IOStandard("LVCMOS25")),

    ("serial", 0,
        Subsignal("rx", Pins("C11"), IOStandard("LVCMOS33")),
        Subsignal("tx", Pins("A11"), IOStandard("LVCMOS33")),
    ),

    ("ddram", 0,
        Subsignal("a", Pins(
            "P2 C4 E5 F5 B3 F4 B5 E4",
            "C5 E3 D5 B4 C3"),
            IOStandard("SSTL135_I")),
        Subsignal("ba", Pins("P5 N3 M3"), IOStandard("SSTL135_I")),
        Subsignal("ras_n", Pins("P1"), IOStandard("SSTL135_I")),
        Subsignal("cas_n", Pins("L1"), IOStandard("SSTL135_I")),
        Subsignal("we_n", Pins("M1"), IOStandard("SSTL135_I")),
        Subsignal("cs_n", Pins("K1"), IOStandard("SSTL135_I")),
        Subsignal("dm", Pins("J4 H5"), IOStandard("SSTL135_I")),
        Subsignal("dq", Pins(
            "L5 F1 K4 G1 L4 H1 G2 J3",
            "D1 C1 E2 C2 F3 A2 E1 B1"),
            IOStandard("SSTL135_I"),
            Misc("TERMINATION=75")),
        Subsignal("dqs_p", Pins("K2 H4"), IOStandard("SSTL135D_I"), Misc("TERMINATION=OFF"), Misc("DIFFRESISTOR=100")),
        Subsignal("clk_p", Pins("M4"), IOStandard("SSTL135D_I")),
        Subsignal("cke", Pins("N2"), IOStandard("SSTL135_I")),
        Subsignal("odt", Pins("L2"), IOStandard("SSTL135_I")),
        Subsignal("reset_n", Pins("N4"), IOStandard("SSTL135_I")),
        Misc("SLEWRATE=FAST"),
    ),

    ("eth_clocks", 0,
        Subsignal("tx", Pins("P19")),
        Subsignal("rx", Pins("L20")),
        IOStandard("LVCMOS25")
    ),
    ("eth", 0,
        Subsignal("rst_n", Pins("U17")),
        Subsignal("mdio", Pins("U18")),
        Subsignal("mdc", Pins("T18")),
        Subsignal("rx_ctl", Pins("U19")),
        Subsignal("rx_data", Pins("T20 U20 T19 R18")),
        Subsignal("tx_ctl", Pins("R20")),
        Subsignal("tx_data", Pins("N19 N20 P18 P20")),
        IOStandard("LVCMOS25")
    ),

    ("eth_clocks", 1,
        Subsignal("tx", Pins("C20")),
        Subsignal("rx", Pins("J19")),
        IOStandard("LVCMOS25")
    ),
    ("eth", 1,
        Subsignal("rst_n", Pins("F20")),
        Subsignal("mdio", Pins("H20")),
        Subsignal("mdc", Pins("G19")),
        Subsignal("rx_ctl", Pins("F19")),
        Subsignal("rx_data", Pins("G18 G16 H18 H17")),
        Subsignal("tx_ctl", Pins("E19")),
        Subsignal("tx_data", Pins("J17 J16 D19 D20")),
        IOStandard("LVCMOS25")
    ),

    ("ext_clk", 0,
        Subsignal("p", Pins("A4")),
        Subsignal("n", Pins("A5")),
        IOStandard("LVDS")
    ),

    ("pcie_x1", 0,
        Subsignal("clk_p", Pins("Y11")),
        Subsignal("clk_n", Pins("Y12")),
        Subsignal("rx_p", Pins("Y5")),
        Subsignal("rx_n", Pins("Y6")),
        Subsignal("tx_p", Pins("W4")),
        Subsignal("tx_n", Pins("W5")),
        Subsignal("perst", Pins("A6"), IOStandard("LVCMOS33")),
    ),
]


_ecp5_soc_hat_io = [
    ("sdram_clock", 0, Pins("E14"), IOStandard("LVCMOS33")),
    ("sdram", 0,
         Subsignal("a", Pins(
            "C6 E15 A16 B16 D15 C15 B15 E12",
            "D12 B10 C7 A9 C10")),
         Subsignal("dq", Pins(
            "B19 B12 B9 E6 D6 E7 D7 B11",
            "C14 A14 E13 D13 C13 B13 A13 A12")),
         Subsignal("we_n", Pins("E9")),
         Subsignal("ras_n", Pins("B8")),
         Subsignal("cas_n", Pins("D9")),
         Subsignal("cs_n", Pins("C8")),
         Subsignal("cke", Pins("D11")),
         Subsignal("ba", Pins("D8 E8")),
         Subsignal("dm", Pins("B6 D14")),
         IOStandard("LVCMOS33"), Misc("SLEWRATE=FAST")
    ),
]

# Connectors ---------------------------------------------------------------------------------------

_connectors = [
   ("X3",
        "None",  # (no pin 0)
        "None",  #  1 GND
        "None",  #  2 N/C
        "None",  #  3 +2V5
        "B19",   #  4 EXPCON_IO29
        "B12",   #  5 EXPCON_IO30
        "B9",    #  6 EXPCON_IO31
        "E6",    #  7 EXPCON_IO32
        "D6",    #  8 EXPCON_IO33
        "E7",    #  9 EXPCON_IO34
        "D7",    # 10 EXPCON_IO35
        "B11",   # 11 EXPCON_IO36
        "B6",    # 12 EXPCON_IO37
        "E9",    # 13 EXPCON_IO38
        "D9",    # 14 EXPCON_IO39
        "B8",    # 15 EXPCON_IO40
        "C8",    # 16 EXPCON_IO41
        "D8",    # 17 EXPCON_IO42
        "E8",    # 18 EXPCON_IO43
        "C7",    # 19 EXPCON_IO44
        "C6",    # 20 EXPCON_IO45
        "None",  # 21 +5V
        "None",  # 22 GND
        "None",  # 23 +2V5
        "None",  # 24 GND
        "None",  # 25 +3V3
        "None",  # 26 GND
        "None",  # 27 +3V3
        "None",  # 28 GND
        "None",  # 29 EXPCON_OSC
        "None",  # 30 GND
        "None",  # 31 EXPCON_CLKIN
        "None",  # 32 GND
        "None",  # 33 EXPCON_CLKOUT
        "None",  # 34 GND
        "None",  # 35 +3V3
        "None",  # 36 GND
        "None",  # 37 +3V3
        "None",  # 38 GND
        "None",  # 39 +3V3
        "None",  # 40 GND
    ),
]

# Platform -----------------------------------------------------------------------------------------

class Platform(LatticePlatform):
    default_clk_name = "clk100"
    default_clk_period = 10

    def __init__(self, **kwargs):
        LatticePlatform.__init__(self, "LFE5UM5G-45F-8BG381C", _io, _connectors, **kwargs)

    def do_finalize(self, fragment):
        try:
            self.add_period_constraint(self.lookup_request("eth_clocks", 0).rx, 1e9/125e6)
        except ConstraintError:
            pass
        try:
            self.add_period_constraint(self.lookup_request("eth_clocks", 1).rx, 1e9/125e6)
        except ConstraintError:
            pass

    def create_programmer(self, with_ispclock=True):
        _xcf_ispclock = """
        <Device>
            <SelectedProg value="FALSE"/>
            <Pos>2</Pos>
            <Vendor>Lattice</Vendor>
            <Family>ispCLOCK</Family>
            <Name>ispPAC-CLK5406D</Name>
            <IDCode>0x00191043</IDCode>
            <Operation>Erase,Program,Verify</Operation>
            <Bypass>
                <InstrLen>8</InstrLen>
                <InstrVal>11111111</InstrVal>
                <BScanLen>1</BScanLen>
                <BScanVal>0</BScanVal>
            </Bypass>
        </Device>
"""

        _xcf_template = """
<?xml version='1.0' encoding='utf-8' ?>
<!DOCTYPE        ispXCF    SYSTEM    "IspXCF.dtd" >
<ispXCF version="3.4.1">
    <Comment></Comment>
    <Chain>
        <Comm>JTAG</Comm>
        <Device>
            <SelectedProg value="TRUE"/>
            <Pos>1</Pos>
            <Vendor>Lattice</Vendor>
            <Family>ECP5UM5G</Family>
            <Name>LFE5UM5G-45F</Name>
            <IDCode>0x81112043</IDCode>
            <File>{{bitstream_file}}</File>
            <Operation>Fast Program</Operation>
        </Device>{ispclock}
    </Chain>
    <ProjectOptions>
        <Program>SEQUENTIAL</Program>
        <Process>ENTIRED CHAIN</Process>
        <OperationOverride>No Override</OperationOverride>
        <StartTAP>TLR</StartTAP>
        <EndTAP>TLR</EndTAP>
        <VerifyUsercode value="FALSE"/>
    </ProjectOptions>
    <CableOptions>
        <CableName>USB2</CableName>
        <PortAdd>FTUSB-0</PortAdd>
        <USBID>LATTICE ECP5_5G VERSA BOARD A Location 0000 Serial Lattice ECP5_5G VERSA Board A</USBID>
    </CableOptions>
</ispXCF>
""".format(ispclock=_xcf_ispclock if with_ispclock else "")

        return LatticeProgrammer(_xcf_template)