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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2018 David Shah <david@symbioticeda.com>
*
* 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 "nextpnr.h"
#include <algorithm>
NEXTPNR_NAMESPACE_BEGIN
class Ecp5GlobalRouter
{
public:
Ecp5GlobalRouter(Context *ctx) : ctx(ctx){};
private:
bool is_clock_port(const PortRef &user) {
if (user.cell->type == ctx->id("TRELLIS_LC") && user.port == ctx->id("CLK"))
return true;
return false;
}
std::vector<NetInfo*> get_clocks()
{
std::unordered_map<IdString, int> clockCount;
for (auto &net : ctx->nets) {
NetInfo *ni = net.second.get();
clockCount[ni->name] = 0;
for (const auto &user : ni->users) {
if (is_clock_port(user))
clockCount[ni->name]++;
}
}
std::vector<NetInfo*> clocks;
while (clocks.size() < 16) {
auto max = std::max_element(clockCount.begin(), clockCount.end(), [](
const decltype(clockCount)::value_type &a, const decltype(clockCount)::value_type &b
) {
return a.second < b.second;
});
if (max == clockCount.end() || max->second < 3)
break;
clocks.push_back(ctx->nets.at(max->first).get());
clockCount.erase(max->first);
}
return clocks;
}
PipId find_tap_pip(WireId tile_glb)
{
std::string wireName = ctx->getWireBasename(tile_glb).str(ctx);
std::string glbName = wireName.substr(2);
TapDirection td = ctx->globalInfoAtLoc(tile_glb.location).tap_dir;
WireId tap_wire;
Location tap_loc;
tap_loc.x = ctx->globalInfoAtLoc(tile_glb.location).tap_col;
tap_loc.y = tile_glb.location.y;
if (td == TAP_DIR_LEFT) {
tap_wire = ctx->getWireByLocAndBasename(tap_loc, "L_" + glbName);
} else {
tap_wire = ctx->getWireByLocAndBasename(tap_loc, "R_" + glbName);
}
return *(ctx->getPipsUphill(tap_wire).begin());
}
Context *ctx;
};
void route_ecp5_globals(Context *ctx);
NEXTPNR_NAMESPACE_END
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