From de2d551035b73637fa7215cec7ee7b5cd8c506d0 Mon Sep 17 00:00:00 2001
From: Miodrag Milanovic <mmicko@gmail.com>
Date: Wed, 18 Dec 2024 10:44:25 +0100
Subject: [PATCH] Start adding infrastructure for reading bitstream

---
 himbaechel/uarch/gatemate/bitstream.cc | 8 ++++++++
 himbaechel/uarch/gatemate/gatemate.cc  | 9 +++++++++
 himbaechel/uarch/gatemate/gatemate.h   | 3 +++
 3 files changed, 20 insertions(+)

diff --git a/himbaechel/uarch/gatemate/bitstream.cc b/himbaechel/uarch/gatemate/bitstream.cc
index a80b643a..1d1ec90c 100644
--- a/himbaechel/uarch/gatemate/bitstream.cc
+++ b/himbaechel/uarch/gatemate/bitstream.cc
@@ -148,4 +148,12 @@ void GateMateImpl::write_bitstream(const std::string &device, const std::string
     be.write_bitstream();
 }
 
+bool GateMateImpl::read_bitstream(const std::string &device, const std::string &filename)
+{
+    std::ifstream in(filename);
+    if (!in)
+        log_error("failed to open file %s for reading (%s)\n", filename.c_str(), strerror(errno));
+    return false;
+}
+
 NEXTPNR_NAMESPACE_END
diff --git a/himbaechel/uarch/gatemate/gatemate.cc b/himbaechel/uarch/gatemate/gatemate.cc
index 356222d6..17661f28 100644
--- a/himbaechel/uarch/gatemate/gatemate.cc
+++ b/himbaechel/uarch/gatemate/gatemate.cc
@@ -56,6 +56,15 @@ void GateMateImpl::postRoute()
     }
 }
 
+void GateMateImpl::setupArchContext()
+{
+    const ArchArgs &args = ctx->args;
+    if (args.options.count("read")) {
+        if (!read_bitstream(args.device, args.options.at("read")))
+            log_error("Loading bitstream failed.\n");
+    }
+}
+
 struct GateMateArch : HimbaechelArch
 {
     GateMateArch() : HimbaechelArch("gatemate") {};
diff --git a/himbaechel/uarch/gatemate/gatemate.h b/himbaechel/uarch/gatemate/gatemate.h
index 9da903e6..d6c15995 100644
--- a/himbaechel/uarch/gatemate/gatemate.h
+++ b/himbaechel/uarch/gatemate/gatemate.h
@@ -36,6 +36,7 @@ struct GateMateImpl : HimbaechelAPI
     void init_database(Arch *arch) override;
 
     void init(Context *ctx) override;
+    void setupArchContext() override;
 
     void pack() override;
 
@@ -46,6 +47,8 @@ struct GateMateImpl : HimbaechelAPI
     void drawBel(std::vector<GraphicElement> &g, GraphicElement::style_t style, IdString bel_type, Loc loc) override;
 
     void write_bitstream(const std::string &device, const std::string &filename);
+    bool read_bitstream(const std::string &device, const std::string &filename);
+
     void parse_ccf(const std::string &filename);
 };