From 230de1e68afb0f7c57f64bd1b35850e529395d92 Mon Sep 17 00:00:00 2001
From: Icenowy Zheng <icenowy@aosc.io>
Date: Mon, 24 Jan 2022 23:54:09 +0800
Subject: gowin: add an option to manually specify family

In the vendor IDE, there's a device family named GW1N-9C (which seems to
mean C revision of GW1N-9), in which the model numbers are all the same
with GW1N-9.

Add an option to nextpnr-gowin to allow manually specified family for
this situation.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
 gowin/main.cc | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/gowin/main.cc b/gowin/main.cc
index fb9df48d..343d922b 100644
--- a/gowin/main.cc
+++ b/gowin/main.cc
@@ -48,6 +48,7 @@ po::options_description GowinCommandHandler::getArchOptions()
 {
     po::options_description specific("Architecture specific options");
     specific.add_options()("device", po::value<std::string>(), "device name");
+    specific.add_options()("family", po::value<std::string>(), "family name");
     specific.add_options()("cst", po::value<std::string>(), "physical constraints file");
     return specific;
 }
@@ -62,12 +63,16 @@ std::unique_ptr<Context> GowinCommandHandler::createContext(dict<std::string, Pr
     }
     ArchArgs chipArgs;
     chipArgs.gui = vm.count("gui") != 0;
-    char buf[36];
-    // GW1N and GW1NR variants share the same database.
-    // Most Gowin devices are a System in Package with some SDRAM wirebonded to a GPIO bank.
-    // However, it appears that the S series with embedded ARM core are unique silicon.
-    snprintf(buf, 36, "GW1N%s-%s", match[1].str().c_str(), match[3].str().c_str());
-    chipArgs.family = buf;
+    if (vm.count("family")) {
+	    chipArgs.family = vm["family"].as<std::string>();
+    } else {
+	    char buf[36];
+	    // GW1N and GW1NR variants share the same database.
+	    // Most Gowin devices are a System in Package with some SDRAM wirebonded to a GPIO bank.
+	    // However, it appears that the S series with embedded ARM core are unique silicon.
+	    snprintf(buf, 36, "GW1N%s-%s", match[1].str().c_str(), match[3].str().c_str());
+	    chipArgs.family = buf;
+    }
     chipArgs.partnumber = match[0];
     return std::unique_ptr<Context>(new Context(chipArgs));
 }
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