86 lines
3.4 KiB
C++
86 lines
3.4 KiB
C++
/*
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* nextpnr -- Next Generation Place and Route
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*
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* Copyright (C) 2021 gatecat <gatecat@ds0.me>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#ifndef VIADUCT_HELPERS_H
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#define VIADUCT_HELPERS_H
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#include "nextpnr_namespaces.h"
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#include "nextpnr_types.h"
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NEXTPNR_NAMESPACE_BEGIN
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/*
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Viaduct -- a series of small arches
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See viaduct_api.h for more background.
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viaduct_helpers provides some features for building up arches using the viaduct API
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*/
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// Used to configure various generic pack functions
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struct CellTypePort
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{
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CellTypePort() : cell_type(), port() {};
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CellTypePort(IdString cell_type, IdString port) : cell_type(cell_type), port(port) {};
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explicit CellTypePort(const PortRef &net_port)
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: cell_type(net_port.cell ? net_port.cell->type : IdString()), port(net_port.port) {};
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inline bool operator==(const CellTypePort &other) const
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{
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return cell_type == other.cell_type && port == other.port;
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}
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inline bool operator!=(const CellTypePort &other) const
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{
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return cell_type != other.cell_type || port != other.port;
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}
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inline unsigned hash() const { return mkhash(cell_type.hash(), port.hash()); }
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IdString cell_type, port;
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};
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struct ViaductHelpers
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{
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ViaductHelpers() {};
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Context *ctx;
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void init(Context *ctx) { this->ctx = ctx; }
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// IdStringList components for x and y locations
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std::vector<IdString> x_ids, y_ids, z_ids;
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void resize_ids(int x, int y, int z = 0);
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// Get an IdStringList for a hierarchical ID
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// Because this uses an IdStringList with seperate X and Y components; this will be much more efficient than
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// creating unique strings for each object in each X and Y position
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IdStringList xy_id(int x, int y, IdString base);
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IdStringList xy_id(int x, int y, IdStringList base);
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IdStringList xyz_id(int x, int y, int z, IdString base);
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IdStringList xyz_id(int x, int y, int z, IdStringList base);
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// Common packing functions
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// Remove nextpnr-inserted IO buffers; where IO buffer insertion is done in synthesis
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// expects a set of top-level port types
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void remove_nextpnr_iobs(const pool<CellTypePort> &top_ports);
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// Constrain cells with certain port connection patterns together with a fixed z-offset
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int constrain_cell_pairs(const pool<CellTypePort> &src_ports, const pool<CellTypePort> &sink_ports, int delta_z,
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bool allow_fanout = true);
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// Replace constants with given driving cells
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void replace_constants(CellTypePort vcc_driver, CellTypePort gnd_driver,
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const dict<IdString, Property> &vcc_params = {},
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const dict<IdString, Property> &gnd_params = {});
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};
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NEXTPNR_NAMESPACE_END
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#endif
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