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ice40: make PLL packing more robust

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This commit is contained in:
Sergiusz Bazanski 2018-08-19 13:02:24 +01:00
parent 26be6f9761
commit 1bf22a7f64
2 changed files with 28 additions and 12 deletions
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3
ice40/cells.cc
View File

@ -28,6 +28,7 @@ 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};
}
@ -237,7 +238,7 @@ std::unique_ptr<CellInfo> create_ice_cell(Context *ctx, IdString type, std::stri
add_port(ctx, new_cell.get(), "SCLK", PORT_IN);
add_port(ctx, new_cell.get(), "SDI", PORT_IN);
add_port(ctx, new_cell.get(), "SDI", PORT_OUT);
add_port(ctx, new_cell.get(), "SDO", PORT_OUT);
add_port(ctx, new_cell.get(), "LOCK", PORT_OUT);
add_port(ctx, new_cell.get(), "PLLOUT_A", PORT_OUT);

19
ice40/pack.cc
View File

@ -746,6 +746,19 @@ static void pack_special(Context *ctx)
log_error("PLL '%s' has a REFERENCECLK but is not a CORE PLL", ci->name.c_str(ctx));
}
if (packed->ports.count(ctx->id(newname)) == 0) {
if (ci->ports[pi.name].net == nullptr) {
log_warning("PLL '%s' has unknown unconnected port '%s' - ignoring\n", ci->name.c_str(ctx), pi.name.c_str(ctx));
continue;
} else {
if (ctx->force) {
log_error("PLL '%s' has unknown connected port '%s'\n", ci->name.c_str(ctx), pi.name.c_str(ctx));
} else {
log_warning("PLL '%s' has unknown connected port '%s' - ignoring\n", ci->name.c_str(ctx), pi.name.c_str(ctx));
continue;
}
}
}
replace_port(ci, ctx->id(pi.name.c_str(ctx)), packed.get(), ctx->id(newname));
}
@ -793,13 +806,13 @@ static void pack_special(Context *ctx)
packagepin_cell->ports.erase(pll_packagepin_driver.port);
}
log_info(" constrained '%s' to %s\n", packed->name.c_str(ctx), ctx->getBelName(bel).c_str(ctx));
log_info(" constrained PLL '%s' to %s\n", packed->name.c_str(ctx), ctx->getBelName(bel).c_str(ctx));
packed->attrs[ctx->id("BEL")] = ctx->getBelName(bel).str(ctx);
pll_bel = bel;
constrained = true;
}
if (!constrained) {
log_error(" could not constrain '%s' to any PLL Bel\n", packed->name.c_str(ctx));
log_error("Could not constrain PLL '%s' to any PLL Bel (too many PLLs?)\n", packed->name.c_str(ctx));
}
}
@ -818,6 +831,8 @@ static void pack_special(Context *ctx)
// If we have a net connected to LOCK, make sure it only drives LUTs.
auto port = packed->ports[ctx->id("LOCK")];
if (port.net != nullptr) {
log_info(" PLL '%s' has LOCK output, need to pass all outputs via LUT\n",
ci->name.c_str(ctx));
bool found_lut = false;
bool all_luts = true;
unsigned int lut_count = 0;