diff options
Diffstat (limited to 'ecp5/globals.cc')
| -rw-r--r-- | ecp5/globals.cc | 128 |
1 files changed, 93 insertions, 35 deletions
diff --git a/ecp5/globals.cc b/ecp5/globals.cc index 5e5a2a01..06412fef 100644 --- a/ecp5/globals.cc +++ b/ecp5/globals.cc @@ -25,6 +25,7 @@ #include "log.h" #include "nextpnr.h" #include "place_common.h" +#include "util.h" #define fmt_str(x) (static_cast<const std::ostringstream &>(std::ostringstream() << x).str()) NEXTPNR_NAMESPACE_BEGIN @@ -257,6 +258,45 @@ class Ecp5GlobalRouter return true; } + // Get DCC wirelength based on source + wirelen_t get_dcc_wirelen(CellInfo *dcc) + { + NetInfo *clki = dcc->ports.at(id_CLKI).net; + BelId drv_bel; + const PortRef &drv = clki->driver; + if (drv.cell == nullptr) { + return 0; + } else if (drv.cell->attrs.count(ctx->id("BEL"))) { + drv_bel = ctx->getBelByName(ctx->id(drv.cell->attrs.at(ctx->id("BEL")))); + } else { + // Check if driver is a singleton + BelId last_bel; + bool singleton = true; + for (auto bel : ctx->getBels()) { + if (ctx->getBelType(bel) == drv.cell->type) { + if (last_bel != BelId()) { + singleton = false; + break; + } + last_bel = bel; + } + } + if (singleton && last_bel != BelId()) { + drv_bel = last_bel; + } + } + if (drv_bel == BelId()) { + // Driver is not locked. Use standard metric + float tns; + return get_net_metric(ctx, clki, MetricType::WIRELENGTH, tns); + } else { + // Driver is locked + Loc dcc_loc = ctx->getBelLocation(dcc->bel); + Loc drv_loc = ctx->getBelLocation(drv_bel); + return std::abs(dcc_loc.x - drv_loc.x) + std::abs(dcc_loc.y - drv_loc.y); + } + } + // Attempt to place a DCC void place_dcc(CellInfo *dcc) { @@ -266,8 +306,7 @@ class Ecp5GlobalRouter if (ctx->getBelType(bel) == id_DCCA && ctx->checkBelAvail(bel)) { if (ctx->isValidBelForCell(dcc, bel)) { ctx->bindBel(bel, dcc, STRENGTH_LOCKED); - float tns; - wirelen_t wirelen = get_net_metric(ctx, dcc->ports.at(id_CLKI).net, MetricType::WIRELENGTH, tns); + wirelen_t wirelen = get_dcc_wirelen(dcc); if (wirelen < best_wirelen) { best_bel = bel; best_wirelen = wirelen; @@ -292,11 +331,16 @@ class Ecp5GlobalRouter glbnet->is_global = true; dcc->ports[id_CLKO].net = glbnet.get(); - glbnet->users = net->users; + std::vector<PortRef> keep_users; for (auto user : net->users) { - user.cell->ports.at(user.port).net = glbnet.get(); + if (user.port == id_CLKFB) { + keep_users.push_back(user); + } else { + glbnet->users.push_back(user); + user.cell->ports.at(user.port).net = glbnet.get(); + } } - net->users.clear(); + net->users = keep_users; dcc->ports[id_CLKI].net = net; PortRef clki_pr; @@ -322,47 +366,61 @@ class Ecp5GlobalRouter Context *ctx; public: - void promote_and_route_globals() + void promote_globals() { - log_info("Promoting and routing globals...\n"); + log_info("Promoting globals...\n"); auto clocks = get_clocks(); + for (auto clock : clocks) { + log_info(" promoting clock net %s to global network\n", clock->name.c_str(ctx)); + insert_dcc(clock); + } + } + + void route_globals() + { + log_info("Routing globals...\n"); std::set<int> all_globals, fab_globals; for (int i = 0; i < 16; i++) { all_globals.insert(i); if (i < 8) fab_globals.insert(i); } - for (auto clock : clocks) { - bool drives_fabric = std::any_of(clock->users.begin(), clock->users.end(), - [this](const PortRef &port) { return !is_clock_port(port); }); - int glbid; - if (drives_fabric) { - if (fab_globals.empty()) - continue; - glbid = *(fab_globals.begin()); - } else { - glbid = *(all_globals.begin()); - } - all_globals.erase(glbid); - fab_globals.erase(glbid); - 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); - - // WCK must have routing priority - auto sorted_users = global->users; - std::sort(sorted_users.begin(), sorted_users.end(), [this](const PortRef &a, const PortRef &b) { - return global_route_priority(a) < global_route_priority(b); - }); - for (const auto &user : sorted_users) { - route_logic_tile_global(global, glbid, user); + for (auto cell : sorted(ctx->cells)) { + CellInfo *ci = cell.second; + if (ci->type == id_DCCA) { + NetInfo *clock = ci->ports.at(id_CLKO).net; + NPNR_ASSERT(clock != nullptr); + bool drives_fabric = std::any_of(clock->users.begin(), clock->users.end(), + [this](const PortRef &port) { return !is_clock_port(port); }); + + int glbid; + if (drives_fabric) { + if (fab_globals.empty()) + continue; + glbid = *(fab_globals.begin()); + } else { + glbid = *(all_globals.begin()); + } + all_globals.erase(glbid); + fab_globals.erase(glbid); + + log_info(" routing clock net %s using global %d\n", clock->name.c_str(ctx), glbid); + bool routed = route_onto_global(clock, glbid); + NPNR_ASSERT(routed); + + // WCK must have routing priority + auto sorted_users = clock->users; + std::sort(sorted_users.begin(), sorted_users.end(), [this](const PortRef &a, const PortRef &b) { + return global_route_priority(a) < global_route_priority(b); + }); + for (const auto &user : sorted_users) { + route_logic_tile_global(clock, glbid, user); + } } } } }; - -void route_ecp5_globals(Context *ctx) { Ecp5GlobalRouter(ctx).promote_and_route_globals(); } +void promote_ecp5_globals(Context *ctx) { Ecp5GlobalRouter(ctx).promote_globals(); } +void route_ecp5_globals(Context *ctx) { Ecp5GlobalRouter(ctx).route_globals(); } NEXTPNR_NAMESPACE_END |