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ecp5: Adding main global promoter/router function

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Signed-off-by: David Shah <davey1576@gmail.com>
This commit is contained in:
David Shah 2018-09-29 16:37:18 +01:00
parent f7a270a1d8
commit 4cd582478b
2 changed files with 81 additions and 21 deletions
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76
ecp5/globals.cc
View File

@ -22,7 +22,7 @@
#include <queue>
#include "nextpnr.h"
#include "cells.h"
#include "globals.h"
#include "log.h"
#define fmt_str(x) (static_cast<const std::ostringstream &>(std::ostringstream() << x).str())
@ -73,7 +73,7 @@ class Ecp5GlobalRouter
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)
if (max == clockCount.end() || max->second < 5)
break;
clocks.push_back(ctx->nets.at(max->first).get());
clockCount.erase(max->first);
@ -190,7 +190,7 @@ class Ecp5GlobalRouter
return ctx->getWireByLocAndBasename(Location(0, 0), get_quad_name(quad) + "PCLK" + std::to_string(network));
}
void simple_router(NetInfo *net, WireId src, WireId dst)
bool simple_router(NetInfo *net, WireId src, WireId dst, bool allow_fail = false)
{
std::queue<WireId> visit;
std::unordered_map<WireId, PipId> backtrace;
@ -198,6 +198,8 @@ class Ecp5GlobalRouter
WireId cursor;
while (true) {
if (visit.empty() || visit.size() > 50000) {
if (allow_fail)
return false;
log_error("cannot route global from %s to %s.\n", ctx->getWireName(src).c_str(ctx),
ctx->getWireName(dst).c_str(ctx));
}
@ -226,58 +228,90 @@ class Ecp5GlobalRouter
ctx->bindPip(fnd->second, net, STRENGTH_LOCKED);
cursor = ctx->getPipSrcWire(fnd->second);
}
return true;
}
void route_onto_global(NetInfo *net, int network)
bool route_onto_global(NetInfo *net, int network)
{
WireId glb_src;
if (net->driver.cell->type == ctx->id("TRELLIS_IO")) {
std::string ioglb;
if (!is_global_io(net->driver.cell, ioglb))
goto non_dedicated;
glb_src = ctx->getWireByLocAndBasename(Location(0, 0), ioglb);
}
NPNR_ASSERT(net->driver.cell->type == id_DCCA);
glb_src = ctx->getNetinfoSourceWire(net);
for (int quad = QUAD_UL; quad < QUAD_LR + 1; quad++) {
WireId glb_dst = get_global_wire(GlobalQuadrant(quad), network);
simple_router(net, glb_src, glb_dst);
}
if (false) {
non_dedicated:
log_error("FIXME: currenly global networks can only be driven by dedicated global input pins");
bool routed = simple_router(net, glb_src, glb_dst);
if (!routed)
return false;
}
return true;
}
// Attempt to place a DCC
void place_dcc(CellInfo *dcc) {
for (auto bel : ctx->getBels()) {
if (ctx->getBelType(bel) == id_DCCA && ctx->checkBelAvail(bel)) {
if (ctx->isValidBelForCell(dcc, bel)) {
ctx->bindBel(bel, dcc, STRENGTH_LOCKED);
return;
}
}
}
NPNR_ASSERT_FALSE("failed to place dcca");
}
// Insert a DCC into a net to promote it to a global
NetInfo *insert_dcc(NetInfo *net)
{
auto dcc = create_ecp5_cell(ctx, ctx->id("DCCA"), "$gbuf$" + net->name.str(ctx));
auto dcc = create_ecp5_cell(ctx, id_DCCA, "$gbuf$" + net->name.str(ctx));
std::unique_ptr<NetInfo> glbnet = std::unique_ptr<NetInfo>(new NetInfo);
glbnet->name = ctx->id("$glbnet$" + net->name.str(ctx));
glbnet->driver.cell = dcc.get();
glbnet->driver.port = ctx->id("CLKO");
glbnet->driver.port = id_CLKO;
for (auto user : net->users) {
user.cell->ports.at(user.port).net = glbnet.get();
}
net->users.clear();
dcc->ports[ctx->id("CLKI")].net = net;
dcc->ports[id_CLKI].net = net;
PortRef clki_pr;
clki_pr.port = ctx->id("CLKI");
clki_pr.port = id_CLKI;
clki_pr.cell = dcc.get();
net->users.push_back(clki_pr);
place_dcc(dcc.get());
ctx->cells[dcc->name] = std::move(dcc);
NetInfo *glbptr = glbnet.get();
ctx->nets[glbnet->name] = std::move(glbnet);
return glbptr;
}
Context *ctx;
public:
void promote_and_route_globals() {
log_info("Promoting and routing globals...");
auto clocks = get_clocks();
int glbid = 0;
for (auto clock : clocks) {
log_info(" promoting clock net %s to global %d\n", clock->name.c_str(ctx), glbid);
auto old_users = clock->users;
NetInfo *global = insert_dcc(clock);
bool routed = route_onto_global(global, glbid);
NPNR_ASSERT(routed);
for (const auto &user : global->users) {
route_logic_tile_global(global, glbid, user);
}
glbid++;
}
}
};
void route_ecp5_globals(Context *ctx);
void route_ecp5_globals(Context *ctx) {
Ecp5GlobalRouter(ctx).promote_and_route_globals();
}
NEXTPNR_NAMESPACE_END

26
ecp5/globals.h Normal file
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@ -0,0 +1,26 @@
/*
* 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"
NEXTPNR_NAMESPACE_BEGIN
void route_ecp5_globals(Context *ctx);
NEXTPNR_NAMESPACE_END