zybo_z7: demonstrate use of PS7 (with --cpu-type=zynq7000).

This uses a pre-generated .xci hosted on github, still need to figure out where the best location for it.

litex_boards/platforms/zybo_z7.py

@@ -36,6 +36,33 @@ _io = [
     ),
 ]
 
+_ps7_io = [
+    # ps7
+    ("ps7_clk",   0, Pins(1)),
+    ("ps7_porb",  0, Pins(1)),
+    ("ps7_srstb", 0, Pins(1)),
+    ("ps7_mio",   0, Pins(54)),
+    ("ps7_ddram", 0,
+        Subsignal("addr",    Pins(15)),
+        Subsignal("ba",      Pins(3)),
+        Subsignal("cas_n",   Pins(1)),
+        Subsignal("ck_n",    Pins(1)),
+        Subsignal("ck_p",    Pins(1)),
+        Subsignal("cke",     Pins(1)),
+        Subsignal("cs_n",    Pins(1)),
+        Subsignal("dm",      Pins(4)),
+        Subsignal("dq",      Pins(32)),
+        Subsignal("dqs_n",   Pins(4)),
+        Subsignal("dqs_p",   Pins(4)),
+        Subsignal("odt",     Pins(1)),
+        Subsignal("ras_n",   Pins(1)),
+        Subsignal("reset_n", Pins(1)),
+        Subsignal("we_n",    Pins(1)),
+        Subsignal("vrn",     Pins(1)),
+        Subsignal("vrp",     Pins(1)),
+    ),
+]
+
 _usb_uart_pmod_io = [
     # USB-UART PMOD on JB:
     # - https://store.digilentinc.com/pmod-usbuart-usb-to-uart-interface/
@@ -64,6 +91,7 @@ class Platform(XilinxPlatform):
 
     def __init__(self):
         XilinxPlatform.__init__(self, "xc7z010-clg400-1", _io,  _connectors, toolchain="vivado")
+        self.add_extension(_ps7_io)
         self.add_extension(_usb_uart_pmod_io)
 
     def create_programmer(self):

litex_boards/targets/zybo_z7.py

@@ -11,6 +11,9 @@ from migen import *
 from litex_boards.platforms import zybo_z7
 from litex.build.xilinx.vivado import vivado_build_args, vivado_build_argdict
 
+from litex.soc.interconnect import axi
+from litex.soc.interconnect import wishbone
+
 from litex.soc.cores.clock import *
 from litex.soc.integration.soc_core import *
 from litex.soc.integration.builder import *
@@ -19,14 +22,19 @@ from litex.soc.cores.led import LedChaser
 # CRG ----------------------------------------------------------------------------------------------
 
 class _CRG(Module):
-    def __init__(self, platform, sys_clk_freq):
+    def __init__(self, platform, sys_clk_freq, use_ps7_clk=False):
         self.clock_domains.cd_sys = ClockDomain()
 
         # # #
 
-        self.submodules.pll = pll = S7PLL(speedgrade=-1)
-        pll.register_clkin(platform.request("clk125"), 125e6)
-        pll.create_clkout(self.cd_sys,       sys_clk_freq)
+        if use_ps7_clk:
+            assert sys_clk_freq == 100e6
+            self.comb += ClockSignal("sys").eq(ClockSignal("ps7"))
+            self.comb += ResetSignal("sys").eq(ResetSignal("ps7"))
+        else:
+            self.submodules.pll = pll = S7PLL(speedgrade=-1)
+            pll.register_clkin(platform.request("clk125"), 125e6)
+            pll.create_clkout(self.cd_sys,       sys_clk_freq)
 
 # BaseSoC ------------------------------------------------------------------------------------------
 
@@ -34,13 +42,30 @@ class BaseSoC(SoCCore):
     def __init__(self, sys_clk_freq=int(100e6), **kwargs):
         platform = zybo_z7.Platform()
 
-        # SoCCore ----------------------------------------------------------------------------------
         if kwargs["uart_name"] == "serial": kwargs["uart_name"] = "usb_uart" # Use USB-UART Pmod on JB.
+
+        # SoCCore ----------------------------------------------------------------------------------
         SoCCore.__init__(self, platform, sys_clk_freq,
             ident          = "LiteX SoC on Zybo Z7",
             ident_version  = True,
             **kwargs)
 
+        # Zynq7000 Integration ---------------------------------------------------------------------
+        if kwargs.get("cpu_type", None) == "zynq7000":
+            # Get and set the pre-generated .xci FIXME: change location? add it to the repository?
+            os.system("wget https://github.com/litex-hub/litex-boards/files/4967144/zybo_z7_ps7.txt")
+            os.makedirs("xci", exist_ok=True)
+            os.system("mv zybo_z7_ps7.txt xci/zybo_z7_ps7.xci")
+            self.cpu.set_ps7_xci("xci/zybo_z7_ps7.xci")
+
+            # Connect AXI GP0 to the SoC with base address of 0x43c00000 (default one)
+            wb_gp0  = wishbone.Interface()
+            self.submodules += axi.AXI2Wishbone(
+                axi          = self.cpu.add_axi_gp_master(),
+                wishbone     = wb_gp0,
+                base_address = 0x43c00000)
+            self.add_wb_master(wb_gp0)
+
         # CRG --------------------------------------------------------------------------------------
         self.submodules.crg = _CRG(platform, sys_clk_freq)