From 85bb108ba40f9573571de0a785f9fbc91c4e1dd0 Mon Sep 17 00:00:00 2001
From: gatecat <gatecat@ds0.me>
Date: Wed, 10 Feb 2021 11:54:54 +0000
Subject: Add getBelPinsForCellPin to Arch API

This is a basic implementation, without considering "M of N"
arrangements (e.g. for LUT permuation where you only want to route to 1
out of 4/6 sinks) or using a type other than IdString to identify bel
pins.

But this is also enough to start working out where in nextpnr will break
due to removing the 1:1 cell:bel pin cardinality, as a next step.

Signed-off-by: gatecat <gatecat@ds0.me>
---
 generic/arch.cc | 2 ++
 generic/arch.h  | 2 ++
 2 files changed, 4 insertions(+)

(limited to 'generic')

diff --git a/generic/arch.cc b/generic/arch.cc
index 912f8a53..c51fbb84 100644
--- a/generic/arch.cc
+++ b/generic/arch.cc
@@ -339,6 +339,8 @@ std::vector<IdString> Arch::getBelPins(BelId bel) const
     return ret;
 }
 
+std::array<IdString, 1> Arch::getBelPinsForCellPin(CellInfo *cell_info, IdString pin) const { return {pin}; }
+
 // ---------------------------------------------------------------
 
 WireId Arch::getWireByName(IdStringList name) const
diff --git a/generic/arch.h b/generic/arch.h
index 09fd8e34..e7d204ef 100644
--- a/generic/arch.h
+++ b/generic/arch.h
@@ -124,6 +124,7 @@ struct ArchRanges
     using TileBelsRangeT = const std::vector<BelId> &;
     using BelAttrsRangeT = const std::map<IdString, std::string> &;
     using BelPinsRangeT = std::vector<IdString>;
+    using CellBelPinRangeT = std::array<IdString, 1>;
     // Wires
     using AllWiresRangeT = const std::vector<WireId> &;
     using DownhillPipRangeT = const std::vector<PipId> &;
@@ -241,6 +242,7 @@ struct Arch : ArchAPI<ArchRanges>
     WireId getBelPinWire(BelId bel, IdString pin) const override;
     PortType getBelPinType(BelId bel, IdString pin) const override;
     std::vector<IdString> getBelPins(BelId bel) const override;
+    std::array<IdString, 1> getBelPinsForCellPin(CellInfo *cell_info, IdString pin) const override;
 
     WireId getWireByName(IdStringList name) const override;
     IdStringList getWireName(WireId wire) const override;
-- 
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