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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2018 gatecat <gatecat@ds0.me>
* Copyright (C) 2022 YRabbit <rabbit@yrabbit.cyou>
*
* 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.
*
*/
#ifndef GOWIN_GLOBALS_H
#define GOWIN_GLOBALS_H
#include "nextpnr.h"
NEXTPNR_NAMESPACE_BEGIN
class GowinGlobalRouter
{
public:
GowinGlobalRouter() {}
private:
// wire -> clock#
dict<WireId, int> used_wires;
// ordered nets
struct globalnet_t
{
IdString name;
int clock_ports;
BelId clock_bel;
WireId clock_wire; // clock wire if there is one
int clock; // clock #
globalnet_t()
{
name = IdString();
clock_ports = 0;
clock_bel = BelId();
clock_wire = WireId();
clock = -1;
}
globalnet_t(IdString _name)
{
name = _name;
clock_ports = 0;
clock_bel = BelId();
clock_wire = WireId();
clock = -1;
}
// sort
bool operator<(const globalnet_t &other) const
{
if ((clock_wire != WireId()) ^ (other.clock_wire != WireId())) {
return !(clock_wire != WireId());
}
return clock_ports < other.clock_ports;
}
// search
bool operator==(const globalnet_t &other) const { return name == other.name; }
};
// discovered nets
std::vector<globalnet_t> nets;
bool is_clock_port(PortRef const &user);
std::pair<WireId, BelId> clock_src(Context *ctx, PortRef const &driver);
void gather_clock_nets(Context *ctx, std::vector<globalnet_t> &clock_nets);
IdString route_to_non_clock_port(Context *ctx, WireId const dstWire, int clock, pool<IdString> &used_pips,
pool<IdString> &undo_wires);
void route_net(Context *ctx, globalnet_t const &net);
public:
void mark_globals(Context *ctx);
void route_globals(Context *ctx);
};
NEXTPNR_NAMESPACE_END
#endif // GOWIN_GLOBALS_H
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