machxo2: Stub out cells functions.

1 files changed, 2 insertions, 95 deletions

diff --git a/machxo2/cells.cc b/machxo2/cells.cc
index 21c233d0..522295b0 100644
--- a/machxo2/cells.cc
+++ b/machxo2/cells.cc
@@ -26,122 +26,29 @@ NEXTPNR_NAMESPACE_BEGIN
 
 void add_port(const Context *ctx, CellInfo *cell, std::string name, PortType dir)
 {
-    IdString id = ctx->id(name);
-    NPNR_ASSERT(cell->ports.count(id) == 0);
-    cell->ports[id] = PortInfo{id, nullptr, dir};
+
 }
 
-std::unique_ptr<CellInfo> create_generic_cell(Context *ctx, IdString type, std::string name)
+std::unique_ptr<CellInfo> create_machxo2_cell(Context *ctx, IdString type, std::string name)
 {
     static int auto_idx = 0;
     std::unique_ptr<CellInfo> new_cell = std::unique_ptr<CellInfo>(new CellInfo());
-    if (name.empty()) {
-        new_cell->name = ctx->id("$nextpnr_" + type.str(ctx) + "_" + std::to_string(auto_idx++));
-    } else {
-        new_cell->name = ctx->id(name);
-    }
-    new_cell->type = type;
-    if (type == ctx->id("GENERIC_SLICE")) {
-        new_cell->params[ctx->id("K")] = 4;
-        new_cell->params[ctx->id("INIT")] = 0;
-        new_cell->params[ctx->id("FF_USED")] = 0;
-
-        for (int i = 0; i < 4; i++)
-            add_port(ctx, new_cell.get(), "I[" + std::to_string(i) + "]", PORT_IN);
-
-        add_port(ctx, new_cell.get(), "CLK", PORT_IN);
-
-        add_port(ctx, new_cell.get(), "F", PORT_OUT);
-        add_port(ctx, new_cell.get(), "Q", PORT_OUT);
-    } else if (type == ctx->id("GENERIC_IOB")) {
-        new_cell->params[ctx->id("INPUT_USED")] = 0;
-        new_cell->params[ctx->id("OUTPUT_USED")] = 0;
-        new_cell->params[ctx->id("ENABLE_USED")] = 0;
-
-        add_port(ctx, new_cell.get(), "PAD", PORT_INOUT);
-        add_port(ctx, new_cell.get(), "I", PORT_IN);
-        add_port(ctx, new_cell.get(), "EN", PORT_IN);
-        add_port(ctx, new_cell.get(), "O", PORT_OUT);
-    } else {
-        log_error("unable to create generic cell of type %s", type.c_str(ctx));
-    }
     return new_cell;
 }
 
 void lut_to_lc(const Context *ctx, CellInfo *lut, CellInfo *lc, bool no_dff)
 {
-    lc->params[ctx->id("INIT")] = lut->params[ctx->id("INIT")];
 
-    int lut_k = int_or_default(lut->params, ctx->id("K"), 4);
-    NPNR_ASSERT(lut_k <= 4);
-
-    for (int i = 0; i < lut_k; i++) {
-        IdString port = ctx->id("I[" + std::to_string(i) + "]");
-        replace_port(lut, port, lc, port);
-    }
-
-    if (no_dff) {
-        lc->params[ctx->id("FF_USED")] = 0;
-        replace_port(lut, ctx->id("Q"), lc, ctx->id("F"));
-    }
 }
 
 void dff_to_lc(const Context *ctx, CellInfo *dff, CellInfo *lc, bool pass_thru_lut)
 {
-    lc->params[ctx->id("FF_USED")] = 1;
-    replace_port(dff, ctx->id("CLK"), lc, ctx->id("CLK"));
-
-    if (pass_thru_lut) {
-        // Fill LUT with alternating 10
-        const int init_size = 1 << lc->params[ctx->id("K")].as_int64();
-        std::string init;
-        init.reserve(init_size);
-        for (int i = 0; i < init_size; i += 2)
-            init.append("10");
-        lc->params[ctx->id("INIT")] = Property::from_string(init);
-
-        replace_port(dff, ctx->id("D"), lc, ctx->id("I[0]"));
-    }
 
-    replace_port(dff, ctx->id("Q"), lc, ctx->id("Q"));
 }
 
 void nxio_to_iob(Context *ctx, CellInfo *nxio, CellInfo *iob, std::unordered_set<IdString> &todelete_cells)
 {
-    if (nxio->type == ctx->id("$nextpnr_ibuf")) {
-        iob->params[ctx->id("INPUT_USED")] = 1;
-        replace_port(nxio, ctx->id("O"), iob, ctx->id("O"));
-    } else if (nxio->type == ctx->id("$nextpnr_obuf")) {
-        iob->params[ctx->id("OUTPUT_USED")] = 1;
-        replace_port(nxio, ctx->id("I"), iob, ctx->id("I"));
-    } else if (nxio->type == ctx->id("$nextpnr_iobuf")) {
-        // N.B. tristate will be dealt with below
-        iob->params[ctx->id("INPUT_USED")] = 1;
-        iob->params[ctx->id("OUTPUT_USED")] = 1;
-        replace_port(nxio, ctx->id("I"), iob, ctx->id("I"));
-        replace_port(nxio, ctx->id("O"), iob, ctx->id("O"));
-    } else {
-        NPNR_ASSERT(false);
-    }
-    NetInfo *donet = iob->ports.at(ctx->id("I")).net;
-    CellInfo *tbuf = net_driven_by(
-            ctx, donet, [](const Context *ctx, const CellInfo *cell) { return cell->type == ctx->id("$_TBUF_"); },
-            ctx->id("Y"));
-    if (tbuf) {
-        iob->params[ctx->id("ENABLE_USED")] = 1;
-        replace_port(tbuf, ctx->id("A"), iob, ctx->id("I"));
-        replace_port(tbuf, ctx->id("E"), iob, ctx->id("EN"));
 
-        if (donet->users.size() > 1) {
-            for (auto user : donet->users)
-                log_info("     remaining tristate user: %s.%s\n", user.cell->name.c_str(ctx), user.port.c_str(ctx));
-            log_error("unsupported tristate IO pattern for IO buffer '%s', "
-                      "instantiate GENERIC_IOB manually to ensure correct behaviour\n",
-                      nxio->name.c_str(ctx));
-        }
-        ctx->nets.erase(donet->name);
-        todelete_cells.insert(tbuf->name);
-    }
 }
 
 NEXTPNR_NAMESPACE_END