ecp5: Helper functions and bitstream for DQS

Signed-off-by: David Shah <dave@ds0.me>

2 files changed, 63 insertions, 0 deletions

diff --git a/ecp5/bitstream.cc b/ecp5/bitstream.cc
index e2d9888a..789957c6 100644
--- a/ecp5/bitstream.cc
+++ b/ecp5/bitstream.cc
@@ -1191,6 +1191,36 @@ void write_bitstream(Context *ctx, std::string base_config_file, std::string tex
             cc.tiles[tile].add_enum(clkdiv + ".DIV", str_or_default(ci->params, ctx->id("DIV"), "2.0"));
             cc.tiles[tile].add_enum(clkdiv + ".GSR", str_or_default(ci->params, ctx->id("GSR"), "DISABLED"));
         } else if (ci->type == id_TRELLIS_ECLKBUF) {
+        } else if (ci->type == id_DQSBUFM) {
+            Loc loc = ctx->getBelLocation(ci->bel);
+            bool l = loc.y < 10;
+            std::string pic = l ? "PICL" : "PICR";
+            TileGroup tg;
+            tg.tiles.push_back(ctx->getTileByTypeAndLocation(loc.y - 2, loc.x, pic + "1_DQS0"));
+            tg.tiles.push_back(ctx->getTileByTypeAndLocation(loc.y - 1, loc.x, pic + "2_DQS1"));
+            tg.tiles.push_back(ctx->getTileByTypeAndLocation(loc.y, loc.x, pic + "0_DQS2"));
+            tg.tiles.push_back(ctx->getTileByTypeAndLocation(loc.y + 1, loc.x, pic + "1_DQS3"));
+            tg.config.add_enum("DQS.MODE", "DQSBUFM");
+            tg.config.add_enum("DQS.DQS_LI_DEL_ADJ", str_or_default(ci->params, ctx->id("DQS_LI_DEL_ADJ"), "PLUS"));
+            tg.config.add_enum("DQS.DQS_LO_DEL_ADJ", str_or_default(ci->params, ctx->id("DQS_LO_DEL_ADJ"), "PLUS"));
+            int li_del_value = int_or_default(ci->params, ctx->id("DQS_LI_DEL_VAL"), 0);
+            if (str_or_default(ci->params, ctx->id("DQS_LI_DEL_ADJ"), "PLUS") == "MINUS")
+                li_del_value = (256 - li_del_value) & 0xFF;
+            int lo_del_value = int_or_default(ci->params, ctx->id("DQS_LO_DEL_VAL"), 0);
+            if (str_or_default(ci->params, ctx->id("DQS_LO_DEL_ADJ"), "PLUS") == "MINUS")
+                lo_del_value = (256 - lo_del_value) & 0xFF;
+            tg.config.add_word("DQS.DQS_LI_DEL_VAL", int_to_bitvector(li_del_value, 8));
+            tg.config.add_word("DQS.DQS_LO_DEL_VAL", int_to_bitvector(lo_del_value, 8));
+            tg.config.add_enum("DQS.WRLOADN_USED", get_net_or_empty(ci, id_WRLOADN) != nullptr ? "YES" : "NO");
+            tg.config.add_enum("DQS.RDLOADN_USED", get_net_or_empty(ci, id_RDLOADN) != nullptr ? "YES" : "NO");
+            tg.config.add_enum("DQS.PAUSE_USED", get_net_or_empty(ci, id_PAUSE) != nullptr ? "YES" : "NO");
+            tg.config.add_enum("DQS.READ_USED",
+                               (get_net_or_empty(ci, id_READ0) != nullptr || get_net_or_empty(ci, id_READ1) != nullptr)
+                                       ? "YES"
+                                       : "NO");
+            tg.config.add_enum("DQS.DDRDEL", get_net_or_empty(ci, id_DDRDEL) != nullptr ? "DDRDEL" : "0");
+            tg.config.add_enum("DQS.GSR", str_or_default(ci->params, ctx->id("GSR"), "DISABLED"));
+            cc.tilegroups.push_back(tg);
         } else {
             NPNR_ASSERT_FALSE("unsupported cell type");
         }
diff --git a/ecp5/pack.cc b/ecp5/pack.cc
index 7abad40b..7538989c 100644
--- a/ecp5/pack.cc
+++ b/ecp5/pack.cc
@@ -1673,6 +1673,39 @@ class Ecp5Packer
             return iol_ptr;
         };
 
+        auto process_dqs_port = [&](CellInfo *prim, CellInfo *pio, CellInfo *iol, IdString port) {
+            NetInfo *sig = nullptr;
+            if (prim->ports.count(port))
+                sig = prim->ports[port].net;
+            if (sig == nullptr || sig->driver.cell == nullptr)
+                log_error("Port %s of cell '%s' cannot be disconnected, it must be driven by a DQSBUFM\n",
+                          port.c_str(ctx), prim->name.c_str(ctx));
+            if (iol->ports.at(port).net != nullptr) {
+                if (iol->ports.at(port).net != sig) {
+                    log_error("IOLOGIC '%s' has conflicting %s signals '%s' and '%s'\n", iol->name.c_str(ctx),
+                              port.c_str(ctx), iol->ports[port].net->name.c_str(ctx), sig->name.c_str(ctx));
+                }
+            } else {
+                bool dqsr;
+                int dqsgroup;
+                bool has_dqs = ctx->getPIODQSGroup(get_pio_bel(pio, prim), dqsr, dqsgroup);
+                if (!has_dqs)
+                    log_error("Primitive '%s' cannot be connected to top level port '%s' as the associated pin is not "
+                              "in any DQS group",
+                              prim->name.c_str(ctx), pio->name.c_str(ctx));
+                if (sig->driver.cell->type != id_DQSBUFM || sig->driver.port != port)
+                    log_error("Port %s of cell '%s' must be driven by port %s of a DQSBUFM", port.c_str(ctx),
+                              prim->name.c_str(ctx), port.c_str(ctx));
+                auto &driver_group = dqsbuf_dqsg.at(sig->driver.cell->name);
+                if (driver_group.first != dqsr || driver_group.second != dqsgroup)
+                    log_error("DQS group mismatch, port %s of '%s' in group %cDQ%d is driven by DQSBUFM '%s' in group "
+                              "%cDQ%d\n",
+                              port.c_str(ctx), prim->name.c_str(ctx), dqsr ? 'R' : 'L', dqsgroup,
+                              sig->driver.cell->name.c_str(ctx), driver_group.first ? 'R' : 'L', driver_group.second);
+                replace_port(prim, port, iol, port);
+            }
+        };
+
         for (auto cell : sorted(ctx->cells)) {
             CellInfo *ci = cell.second;
             if (ci->type == ctx->id("IDDRX1F")) {