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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2018 Clifford Wolf <clifford@clifford.at>
* Copyright (C) 2018 David Shah <david@symbioticeda.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "arch_place.h"
#include "cells.h"
#include "util.h"
NEXTPNR_NAMESPACE_BEGIN
PlaceValidityChecker::PlaceValidityChecker(Context *ctx)
: ctx(ctx), id_icestorm_lc(ctx, "ICESTORM_LC"), id_sb_io(ctx, "SB_IO"),
id_sb_gb(ctx, "SB_GB"), id_cen(ctx, "CEN"), id_clk(ctx, "CLK"),
id_sr(ctx, "SR"), id_i0(ctx, "I0"), id_i1(ctx, "I1"),
id_i2(ctx, "I2"), id_i3(ctx, "I3"), id_dff_en(ctx, "DFF_ENABLE"),
id_neg_clk(ctx, "NEG_CLK")
{
}
static const NetInfo *get_net_or_empty(const CellInfo *cell,
const IdString port)
{
auto found = cell->ports.find(port);
if (found != cell->ports.end())
return found->second.net;
else
return nullptr;
};
bool PlaceValidityChecker::logicCellsCompatible(
const Context *ctx, const std::vector<const CellInfo *> &cells)
{
bool dffs_exist = false, dffs_neg = false;
const NetInfo *cen = nullptr, *clk = nullptr, *sr = nullptr;
int locals_count = 0;
for (auto cell : cells) {
if (bool_or_default(cell->params, id_dff_en)) {
if (!dffs_exist) {
dffs_exist = true;
cen = get_net_or_empty(cell, id_cen);
clk = get_net_or_empty(cell, id_clk);
sr = get_net_or_empty(cell, id_sr);
if (!is_global_net(ctx, cen) && cen != nullptr)
locals_count++;
if (!is_global_net(ctx, clk) && clk != nullptr)
locals_count++;
if (!is_global_net(ctx, sr) && sr != nullptr)
locals_count++;
if (bool_or_default(cell->params, id_neg_clk)) {
dffs_neg = true;
}
} else {
if (cen != get_net_or_empty(cell, id_cen))
return false;
if (clk != get_net_or_empty(cell, id_clk))
return false;
if (sr != get_net_or_empty(cell, id_sr))
return false;
if (dffs_neg != bool_or_default(cell->params, id_neg_clk))
return false;
}
}
const NetInfo *i0 = get_net_or_empty(cell, id_i0),
*i1 = get_net_or_empty(cell, id_i1),
*i2 = get_net_or_empty(cell, id_i2),
*i3 = get_net_or_empty(cell, id_i3);
if (i0 != nullptr)
locals_count++;
if (i1 != nullptr)
locals_count++;
if (i2 != nullptr)
locals_count++;
if (i3 != nullptr)
locals_count++;
}
return locals_count <= 32;
}
bool PlaceValidityChecker::isBelLocationValid(BelId bel)
{
if (ctx->getBelType(bel) == TYPE_ICESTORM_LC) {
std::vector<const CellInfo *> cells;
for (auto bel_other : ctx->getBelsAtSameTile(bel)) {
IdString cell_other = ctx->getBelCell(bel_other, false);
if (cell_other != IdString()) {
const CellInfo *ci_other = ctx->cells[cell_other];
cells.push_back(ci_other);
}
}
return logicCellsCompatible(ctx, cells);
} else {
IdString cellId = ctx->getBelCell(bel, false);
if (cellId == IdString())
return true;
else
return isValidBelForCell(ctx->cells.at(cellId), bel);
}
}
bool PlaceValidityChecker::isValidBelForCell(CellInfo *cell, BelId bel)
{
if (cell->type == id_icestorm_lc) {
assert(ctx->getBelType(bel) == TYPE_ICESTORM_LC);
std::vector<const CellInfo *> cells;
for (auto bel_other : ctx->getBelsAtSameTile(bel)) {
IdString cell_other = ctx->getBelCell(bel_other, false);
if (cell_other != IdString()) {
const CellInfo *ci_other = ctx->cells[cell_other];
cells.push_back(ci_other);
}
}
cells.push_back(cell);
return logicCellsCompatible(ctx, cells);
} else if (cell->type == id_sb_io) {
return ctx->getBelPackagePin(bel) != "";
} else if (cell->type == id_sb_gb) {
bool is_reset = false, is_cen = false;
assert(cell->ports.at("GLOBAL_BUFFER_OUTPUT").net != nullptr);
for (auto user : cell->ports.at("GLOBAL_BUFFER_OUTPUT").net->users) {
if (is_reset_port(ctx, user))
is_reset = true;
if (is_enable_port(ctx, user))
is_cen = true;
}
IdString glb_net = ctx->getWireName(
ctx->getWireBelPin(bel, PIN_GLOBAL_BUFFER_OUTPUT));
int glb_id = std::stoi(std::string("") + glb_net.str().back());
if (is_reset && is_cen)
return false;
else if (is_reset)
return (glb_id % 2) == 0;
else if (is_cen)
return (glb_id % 2) == 1;
else
return true;
} else {
// TODO: IO cell clock checks
return true;
}
}
NEXTPNR_NAMESPACE_END
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