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Merge pull request #941 from yrabbit/gsr

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gowin: Add the Global Set/Reset primitive
This commit is contained in:
gatecat 2022-03-12 15:43:26 +00:00 committed by GitHub
commit 233ea62c13
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4 changed files with 51 additions and 0 deletions
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8
gowin/arch.cc
View File

@ -991,6 +991,14 @@ Arch::Arch(ArchArgs args) : args(args)
int z = 0;
bool dff = true;
switch (static_cast<ConstIds>(bel->type_id)) {
case ID_GSR0:
snprintf(buf, 32, "R%dC%d_GSR0", row + 1, col + 1);
belname = id(buf);
addBel(belname, id_GSR, Loc(col, row, 0), false);
portname = IdString(pairLookup(bel->ports.get(), bel->num_ports, ID_GSRI)->src_id);
snprintf(buf, 32, "R%dC%d_%s", row + 1, col + 1, portname.c_str(this));
addBelInput(belname, id_GSRI, id(buf));
break;
// fall through the ++
case ID_LUT7:
z++;

2
gowin/cells.cc
View File

@ -63,6 +63,8 @@ std::unique_ptr<CellInfo> create_generic_cell(Context *ctx, IdString type, std::
new_cell->addInput(id_I);
new_cell->addInput(id_OEN);
new_cell->addOutput(id_O);
} else if (type == id_GSR) {
new_cell->addInput(id_GSRI);
} else {
log_error("unable to create generic cell of type %s\n", type.c_str(ctx));
}

5
gowin/constids.inc
View File

@ -739,6 +739,11 @@ X(IOBUF)
X(TBUF)
X(TLVDS_OBUF)
// global set/reset
X(GSR)
X(GSR0)
X(GSRI)
// primitive attributes
X(INIT)
X(FF_USED)

36
gowin/pack.cc
View File

@ -660,6 +660,41 @@ static void pack_constants(Context *ctx)
}
}
// Pack global set-reset
static void pack_gsr(Context *ctx)
{
log_info("Packing GSR..\n");
bool user_gsr = false;
for (auto &cell : ctx->cells) {
CellInfo *ci = cell.second.get();
if (ctx->verbose)
log_info("cell '%s' is of type '%s'\n", ctx->nameOf(ci), ci->type.c_str(ctx));
if (ci->type == id_GSR) {
user_gsr = true;
break;
}
}
if (!user_gsr) {
// XXX
bool have_gsr_bel = false;
for (auto bi : ctx->bels) {
if (bi.second.type == id_GSR) {
have_gsr_bel = true;
break;
}
}
if (have_gsr_bel) {
// make default GSR
std::unique_ptr<CellInfo> gsr_cell = create_generic_cell(ctx, id_GSR, "GSR");
gsr_cell->connectPort(id_GSRI, ctx->nets[ctx->id("$PACKER_VCC_NET")].get());
ctx->cells[gsr_cell->name] = std::move(gsr_cell);
} else {
log_info("No GSR in the chip base\n");
}
}
}
static bool is_nextpnr_iob(const Context *ctx, CellInfo *cell)
{
return cell->type == ctx->id("$nextpnr_ibuf") || cell->type == ctx->id("$nextpnr_obuf") ||
@ -857,6 +892,7 @@ bool Arch::pack()
try {
log_break();
pack_constants(ctx);
pack_gsr(ctx);
pack_io(ctx);
pack_diff_io(ctx);
pack_wideluts(ctx);