1 files changed, 71 insertions, 0 deletions
diff --git a/ice40/pcf.cc b/ice40/pcf.cc
new file mode 100644
index 00000000..75c32731
--- /dev/null
+++ b/ice40/pcf.cc
@@ -0,0 +1,71 @@
+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2018  Clifford Wolf <clifford@clifford.at>
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include "pcf.h"
+#include <sstream>
+#include "log.h"
+
+NEXTPNR_NAMESPACE_BEGIN
+
+// Read a w
+
+// Apply PCF constraints to a pre-packing design
+void apply_pcf(Design *design, std::istream &in)
+{
+    if (!in)
+        log_error("failed to open PCF file");
+    std::string line;
+    while (std::getline(in, line)) {
+        size_t cstart = line.find("#");
+        if (cstart != std::string::npos)
+            line = line.substr(0, cstart);
+        std::stringstream ss(line);
+        std::vector<std::string> words;
+        std::string tmp;
+        while (ss >> tmp)
+            words.push_back(tmp);
+        if (words.size() == 0)
+            continue;
+        std::string cmd = words.at(0);
+        if (cmd == "set_io") {
+            size_t args_end = 1;
+            while (args_end < words.size() && words.at(args_end).at(0) == '-')
+                args_end++;
+            std::string cell = words.at(args_end);
+            std::string pin = words.at(args_end + 1);
+            auto fnd_cell = design->cells.find(cell);
+            if (fnd_cell == design->cells.end()) {
+                log_warning("unmatched pcf constraint %s\n", cell.c_str());
+            } else {
+                BelId pin_bel = design->chip.getPackagePinBel(pin);
+                if (pin_bel == BelId())
+                    log_error("package does not have a pin named %s\n",
+                              pin.c_str());
+                fnd_cell->second->attrs["BEL"] =
+                        design->chip.getBelName(pin_bel).str();
+                log_info("constrained '%s' to bel '%s'\n", cell.c_str(),
+                         fnd_cell->second->attrs["BEL"].c_str());
+            }
+        } else {
+            log_error("unsupported pcf command '%s'\n", cmd.c_str());
+        }
+    }
+}
+
+NEXTPNR_NAMESPACE_END