# This file is Copyright (c) 2018-2019 Florent Kermarrec <florent@enjoy-digital.fr>
# License: BSD

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

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

_io = [
    ("clk25", 0, Pins("G2"), IOStandard("LVCMOS33")),
    ("rst",   0, Pins("R1"), IOStandard("LVCMOS33")),

    ("user_led", 0, Pins("B2"), IOStandard("LVCMOS33")),
    ("user_led", 1, Pins("C2"), IOStandard("LVCMOS33")),
    ("user_led", 2, Pins("C1"), IOStandard("LVCMOS33")),
    ("user_led", 3, Pins("D2"), IOStandard("LVCMOS33")),
    ("user_led", 4, Pins("D1"), IOStandard("LVCMOS33")),
    ("user_led", 5, Pins("E2"), IOStandard("LVCMOS33")),
    ("user_led", 6, Pins("E1"), IOStandard("LVCMOS33")),
    ("user_led", 7, Pins("H3"), IOStandard("LVCMOS33")),

    ("serial", 0,
        Subsignal("tx", Pins("L4"), IOStandard("LVCMOS33")),
        Subsignal("rx", Pins("M1"), IOStandard("LVCMOS33"))
    ),

    ("spisdcard", 0,
        Subsignal("clk",  Pins("J1")),
        Subsignal("mosi", Pins("J3"), Misc("PULLMODE=UP")),
        Subsignal("cs_n", Pins("H1"), Misc("PULLMODE=UP")),
        Subsignal("miso", Pins("K2"), Misc("PULLMODE=UP")),
        Misc("SLEWRATE=FAST"),
        IOStandard("LVCMOS33"),
    ),

    ("sdram_clock", 0, Pins("F19"),
        Misc("PULLMODE=NONE"),
        Misc("DRIVE=4"),
        Misc("SLEWRATE=FAST"),
        IOStandard("LVCMOS33")
    ),
    ("sdram", 0,
        Subsignal("a",     Pins(
            "M20 M19 L20 L19 K20 K19 K18 J20",
            "J19 H20 N19 G20 G19")),
        Subsignal("dq",    Pins(
            "J16 L18 M18 N18 P18 T18 T17 U20",
            "E19 D20 D19 C20 E18 F18 J18 J17")),
        Subsignal("we_n",  Pins("T20")),
        Subsignal("ras_n", Pins("R20")),
        Subsignal("cas_n", Pins("T19")),
        Subsignal("cs_n",  Pins("P20")),
        Subsignal("cke",   Pins("F20")),
        Subsignal("ba",    Pins("P19 N20")),
        Subsignal("dm",    Pins("U19 E20")),
        Misc("PULLMODE=NONE"),
        Misc("DRIVE=4"),
        Misc("SLEWRATE=FAST"),
        IOStandard("LVCMOS33"),
    ),

    ("wifi_gpio0", 0, Pins("L2"), IOStandard("LVCMOS33")),

    ("ext0p", 0, Pins("B11"), IOStandard("LVCMOS33")),
    ("ext1p", 0, Pins("A10"), IOStandard("LVCMOS33")),

    ("gpio", 0,
        Subsignal("p", Pins("B11")),
        Subsignal("n", Pins("C11")),
        IOStandard("LVCMOS33")
    ),
    ("gpio", 1,
        Subsignal("p", Pins("A10")),
        Subsignal("n", Pins("A11")),
        IOStandard("LVCMOS33")
    ),
    ("gpio", 2,
        Subsignal("p", Pins("A9")),
        Subsignal("n", Pins("B10")),
        IOStandard("LVCMOS33")
    ),
    ("gpio", 3,
        Subsignal("p", Pins("B9")),
        Subsignal("n", Pins("C10")),
        IOStandard("LVCMOS33")
    ),

    ("usb", 0,
        Subsignal("d_p", Pins("D15")),
        Subsignal("d_n", Pins("E15")),
        Subsignal("pullup", Pins("B12 C12")),
        IOStandard("LVCMOS33")
    ),
]

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

class Platform(LatticePlatform):
    default_clk_name   = "clk25"
    default_clk_period = 1e9/25e6

    def __init__(self, device="LFE5U-45F", **kwargs):
        LatticePlatform.__init__(self, device + "-6BG381C", _io, **kwargs)

    def do_finalize(self, fragment):
        LatticePlatform.do_finalize(self, fragment)
        self.add_period_constraint(self.lookup_request("clk25", loose=True), 1e9/25e6)