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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 <algorithm>
#include <iomanip>
#include <queue>
#include "nextpnr.h"
#include "log.h"
#define fmt_str(x) (static_cast<const std::ostringstream &>(std::ostringstream() << x).str())
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());
}
void route_logic_tile_global(IdString net, int global_index, PortRef user)
{
WireId userWire = ctx->getBelPinWire(user.cell->bel, ctx->portPinFromId(user.port));
WireId globalWire;
IdString global_name = ctx->id(fmt_str("G_HPBX" << std::setw(2) << std::setfill('0') << global_index << "00"));
std::queue<WireId> upstream;
std::unordered_map<WireId, PipId> backtrace;
upstream.push(userWire);
bool already_routed = false;
// Search back from the pin until we reach the global network
while (true) {
WireId next = upstream.front();
upstream.pop();
if (ctx->getBoundWireNet(next) == net) {
already_routed = true;
globalWire = next;
break;
}
if (ctx->getWireBasename(next) == global_name) {
globalWire = next;
break;
}
if (ctx->checkWireAvail(next)) {
for (auto pip : ctx->getPipsUphill(next)) {
WireId src = ctx->getPipSrcWire(pip);
backtrace[src] = pip;
upstream.push(src);
}
}
if (upstream.size() > 3000) {
log_error("failed to route HPBX%02d00 to %s.%s\n", global_index,
ctx->getBelName(user.cell->bel).c_str(ctx), user.port.c_str(ctx));
}
}
// Set all the pips we found along the way
WireId cursor = userWire;
while (true) {
auto fnd = backtrace.find(cursor);
if (fnd == backtrace.end())
break;
ctx->bindPip(fnd->second, net, STRENGTH_LOCKED);
cursor = ctx->getPipSrcWire(fnd->second);
}
// If the global network inside the tile isn't already set up,
// we also need to bind the buffers along the way
if (!already_routed) {
ctx->bindWire(cursor, net, STRENGTH_LOCKED);
PipId tap_pip = find_tap_pip(cursor);
IdString tap_net = ctx->getBoundPipNet(tap_pip);
if (tap_net == IdString()) {
ctx->bindPip(tap_pip, net, STRENGTH_LOCKED);
// TODO: SPINE
} else {
NPNR_ASSERT(tap_net == net);
}
}
}
Context *ctx;
};
void route_ecp5_globals(Context *ctx);
NEXTPNR_NAMESPACE_END
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