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ice40: Improve error reporting for invalid tristate usage

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Signed-off-by: David Shah <davey1576@gmail.com>
This commit is contained in:
David Shah 2018-06-19 14:10:28 +02:00
parent ecc2c486d9
commit a8071a418d
3 changed files with 24 additions and 15 deletions
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11
ice40/cells.cc
View File

@ -200,8 +200,8 @@ void nxio_to_sb(Context *ctx, CellInfo *nxio, CellInfo *sbio)
}
NetInfo *donet = sbio->ports.at(ctx->id("D_OUT_0")).net;
CellInfo *tbuf =
net_driven_by(ctx, donet, []
(const Context *ctx, const CellInfo *cell) {
net_driven_by(ctx, donet,
[](const Context *ctx, const CellInfo *cell) {
return cell->type == ctx->id("$_TBUF_");
},
"Y");
@ -210,6 +210,10 @@ void nxio_to_sb(Context *ctx, CellInfo *nxio, CellInfo *sbio)
replace_port(tbuf, "A", sbio, "D_OUT_0");
replace_port(tbuf, "E", sbio, "OUTPUT_ENABLE");
ctx->nets.erase(donet->name);
if (!donet->users.empty())
log_error("unsupported tristate IO pattern for IO buffer '%s', "
"instantiate SB_IO manually to ensure correct behaviour\n",
nxio->name.c_str(ctx));
ctx->cells.erase(tbuf->name);
}
}
@ -251,7 +255,8 @@ bool is_enable_port(const Context *ctx, const PortRef &port)
bool is_global_net(const Context *ctx, const NetInfo *net)
{
return bool(net_driven_by(ctx, net, is_gbuf, ctx->id("GLOBAL_BUFFER_OUTPUT")));
return bool(
net_driven_by(ctx, net, is_gbuf, ctx->id("GLOBAL_BUFFER_OUTPUT")));
}
NEXTPNR_NAMESPACE_END

3
ice40/cells.h
View File

@ -27,8 +27,7 @@ NEXTPNR_NAMESPACE_BEGIN
// Create a standard iCE40 cell and return it
// Name will be automatically assigned if not specified
CellInfo *create_ice_cell(Context *ctx, IdString type,
std::string name = "");
CellInfo *create_ice_cell(Context *ctx, IdString type, std::string name = "");
// Return true if a cell is a LUT
inline bool is_lut(const Context *ctx, const CellInfo *cell)

23
ice40/pack.cc
View File

@ -39,8 +39,8 @@ static void pack_lut_lutffs(Context *ctx)
log_info("cell '%s' is of type '%s'\n", ci->name.c_str(ctx),
ci->type.c_str(ctx));
if (is_lut(ctx, ci)) {
CellInfo *packed =
create_ice_cell(ctx, "ICESTORM_LC", ci->name.str(ctx) + "_LC");
CellInfo *packed = create_ice_cell(ctx, "ICESTORM_LC",
ci->name.str(ctx) + "_LC");
std::copy(ci->attrs.begin(), ci->attrs.end(),
std::inserter(packed->attrs, packed->attrs.begin()));
packed_cells.insert(ci->name);
@ -168,7 +168,8 @@ static void set_net_constant(const Context *ctx, NetInfo *orig,
for (auto user : orig->users) {
if (user.cell != nullptr) {
CellInfo *uc = user.cell;
log_info("%s user %s\n", orig->name.c_str(ctx), uc->name.c_str(ctx));
log_info("%s user %s\n", orig->name.c_str(ctx),
uc->name.c_str(ctx));
if (is_lut(ctx, uc) && (user.port.str(ctx).at(0) == 'I') &&
!constval) {
uc->ports[user.port].net = nullptr;
@ -206,7 +207,8 @@ static void pack_constants(Context *ctx)
for (auto net : ctx->nets) {
NetInfo *ni = net.second;
if (ni->driver.cell != nullptr && ni->driver.cell->type == ctx->id("GND")) {
if (ni->driver.cell != nullptr &&
ni->driver.cell->type == ctx->id("GND")) {
set_net_constant(ctx, ni, gnd_net, false);
gnd_used = true;
dead_nets.push_back(net.first);
@ -234,7 +236,8 @@ static void pack_constants(Context *ctx)
static bool is_nextpnr_iob(Context *ctx, CellInfo *cell)
{
return cell->type == ctx->id("$nextpnr_ibuf") || cell->type == ctx->id("$nextpnr_obuf") ||
return cell->type == ctx->id("$nextpnr_ibuf") ||
cell->type == ctx->id("$nextpnr_obuf") ||
cell->type == ctx->id("$nextpnr_iobuf");
}
@ -250,7 +253,8 @@ static void pack_io(Context *ctx)
CellInfo *ci = cell.second;
if (is_nextpnr_iob(ctx, ci)) {
CellInfo *sb = nullptr;
if (ci->type == ctx->id("$nextpnr_ibuf") || ci->type == ctx->id("$nextpnr_iobuf")) {
if (ci->type == ctx->id("$nextpnr_ibuf") ||
ci->type == ctx->id("$nextpnr_iobuf")) {
sb = net_only_drives(ctx, ci->ports.at("O").net, is_sb_io,
"PACKAGE_PIN", true, ci);
@ -262,8 +266,8 @@ static void pack_io(Context *ctx)
// Trivial case, SB_IO used. Just destroy the net and the
// iobuf
log_info("%s feeds SB_IO %s, removing %s %s.\n",
ci->name.c_str(ctx), sb->name.c_str(ctx), ci->type.c_str(ctx),
ci->name.c_str(ctx));
ci->name.c_str(ctx), sb->name.c_str(ctx),
ci->type.c_str(ctx), ci->name.c_str(ctx));
NetInfo *net = sb->ports.at("PACKAGE_PIN").net;
if (net != nullptr) {
ctx->nets.erase(net->name);
@ -271,7 +275,8 @@ static void pack_io(Context *ctx)
}
} else {
// Create a SB_IO buffer
sb = create_ice_cell(ctx, "SB_IO");
sb = create_ice_cell(ctx, "SB_IO",
ci->name.str(ctx) + "$sb_io");
nxio_to_sb(ctx, ci, sb);
new_cells.push_back(sb);
}