From 9f1c3305b65fcc33d00c5129925f8b3bfc720205 Mon Sep 17 00:00:00 2001
From: Feliks <feliks.montez@gmail.com>
Date: Tue, 14 Jan 2020 23:30:49 -0500
Subject: [PATCH] targets/mimas_a7: add support

---
 litex_boards/community/targets/mimas_a7.py | 121 +++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100755 litex_boards/community/targets/mimas_a7.py

diff --git a/litex_boards/community/targets/mimas_a7.py b/litex_boards/community/targets/mimas_a7.py
new file mode 100755
index 0000000..174d073
--- /dev/null
+++ b/litex_boards/community/targets/mimas_a7.py
@@ -0,0 +1,121 @@
+#!/usr/bin/env python3
+
+# This file is Copyright (c) 2015-2019 Florent Kermarrec <florent@enjoy-digital.fr>
+# This file is Copyright (c) 2020 Feliks Montez <feliks.montez@gmail.com>
+# License: BSD
+
+import argparse
+
+from migen import *
+
+from litex_boards.platforms import mimas_a7
+from litex.build.xilinx.vivado import vivado_build_args, vivado_build_argdict
+
+from litex.soc.cores.clock import *
+from litex.soc.integration.soc_sdram import *
+from litex.soc.integration.builder import *
+
+from litedram.modules import MT41J128M16
+from litedram.phy import s7ddrphy
+
+from liteeth.phy.s7rgmii import LiteEthPHYRGMII
+from liteeth.mac import LiteEthMAC
+
+# CRG ----------------------------------------------------------------------------------------------
+
+class _CRG(Module):
+    def __init__(self, platform, sys_clk_freq):
+        self.clock_domains.cd_sys       = ClockDomain()
+        self.clock_domains.cd_sys4x     = ClockDomain(reset_less=True)
+        self.clock_domains.cd_sys4x_dqs = ClockDomain(reset_less=True)
+        self.clock_domains.cd_clk200    = ClockDomain()
+
+        # # #
+
+        self.submodules.pll = pll = S7PLL(speedgrade=-1)
+        self.comb += pll.reset.eq(platform.request("cpu_reset"))
+        pll.register_clkin(platform.request("clk100"), 100e6)
+        pll.create_clkout(self.cd_sys,       sys_clk_freq)
+        pll.create_clkout(self.cd_sys4x,     4*sys_clk_freq)
+        pll.create_clkout(self.cd_sys4x_dqs, 4*sys_clk_freq, phase=90)
+        pll.create_clkout(self.cd_clk200,    200e6)
+
+        self.submodules.idelayctrl = S7IDELAYCTRL(self.cd_clk200)
+
+
+# BaseSoC ------------------------------------------------------------------------------------------
+
+class BaseSoC(SoCSDRAM):
+    def __init__(self, sys_clk_freq=int(100e6), integrated_rom_size=0x8000, uart_name="usb_fifo", **kwargs):
+        platform = mimas_a7.Platform()
+
+        # SoCSDRAM ---------------------------------------------------------------------------------
+        SoCSDRAM.__init__(self, platform, clk_freq=sys_clk_freq,
+                         integrated_rom_size=integrated_rom_size,
+                         integrated_sram_size=0x8000,
+                         uart_name=uart_name,
+                         **kwargs)
+
+        # CRG --------------------------------------------------------------------------------------
+        self.submodules.crg = _CRG(platform, sys_clk_freq)
+
+        # DDR3 SDRAM -------------------------------------------------------------------------------
+        if not self.integrated_main_ram_size:
+            self.submodules.ddrphy = s7ddrphy.A7DDRPHY(platform.request("ddram"),
+                memtype      = "DDR3",
+                nphases      = 4,
+                sys_clk_freq = sys_clk_freq)
+            self.add_csr("ddrphy")
+            sdram_module = MT41J128M16(sys_clk_freq, "1:4")
+            self.register_sdram(self.ddrphy,
+                geom_settings   = sdram_module.geom_settings,
+                timing_settings = sdram_module.timing_settings)
+
+# EthernetSoC --------------------------------------------------------------------------------------
+
+class EthernetSoC(BaseSoC):
+    mem_map = {
+        "ethmac": 0xb0000000,
+    }
+    mem_map.update(BaseSoC.mem_map)
+
+    def __init__(self, **kwargs):
+        BaseSoC.__init__(self, integrated_rom_size=0x10000, **kwargs)
+
+        self.submodules.ethphy = LiteEthPHYRGMII(self.platform.request("eth_clocks"),
+                                               self.platform.request("eth"))
+        self.add_csr("ethphy")
+        self.submodules.ethmac = LiteEthMAC(phy=self.ethphy, dw=32,
+            interface="wishbone", endianness=self.cpu.endianness)
+        self.add_wb_slave(self.mem_map["ethmac"], self.ethmac.bus, 0x2000)
+        self.add_memory_region("ethmac", self.mem_map["ethmac"], 0x2000, type="io")
+        self.add_csr("ethmac")
+        self.add_interrupt("ethmac")
+
+        self.platform.add_period_constraint(self.ethphy.crg.cd_eth_rx.clk, 1e9/12.5e6)
+        self.platform.add_period_constraint(self.ethphy.crg.cd_eth_tx.clk, 1e9/12.5e6)
+        self.platform.add_false_path_constraints(
+            self.crg.cd_sys.clk,
+            self.ethphy.crg.cd_eth_rx.clk,
+            self.ethphy.crg.cd_eth_tx.clk)
+
+
+# Build --------------------------------------------------------------------------------------------
+
+def main():
+    parser = argparse.ArgumentParser(description="LiteX SoC on Mimas A7")
+    builder_args(parser)
+    soc_sdram_args(parser)
+    vivado_build_args(parser)
+    parser.add_argument("--with-ethernet", action="store_true",
+                        help="enable Ethernet support")
+    args = parser.parse_args()
+
+    cls = EthernetSoC if args.with_ethernet else BaseSoC
+    soc = cls(**soc_sdram_argdict(args))
+    builder = Builder(soc, **builder_argdict(args))
+    builder.build(**vivado_build_argdict(args))
+
+
+if __name__ == "__main__":
+    main()