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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2018 Clifford Wolf <clifford@symbioticeda.com>
* Copyright (C) 2018 David Shah <david@symbioticeda.com>
* Copyright (C) 2018 Serge Bazanski <q3k@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 "cells.h"
#include "nextpnr.h"
#include "util.h"
NEXTPNR_NAMESPACE_BEGIN
bool Arch::logicCellsCompatible(const std::vector<const CellInfo *> &cells) const
{
bool dffs_exist = false, dffs_neg = false;
const NetInfo *cen = nullptr, *clk = nullptr, *sr = nullptr;
int locals_count = 0;
for (auto cell : cells) {
NPNR_ASSERT(cell->belType == id_ICESTORM_LC);
if (cell->lcInfo.dffEnable) {
if (!dffs_exist) {
dffs_exist = true;
cen = cell->lcInfo.cen;
clk = cell->lcInfo.clk;
sr = cell->lcInfo.sr;
if (cen != nullptr && !cen->is_global)
locals_count++;
if (clk != nullptr && !clk->is_global)
locals_count++;
if (sr != nullptr && !sr->is_global)
locals_count++;
if (cell->lcInfo.negClk) {
dffs_neg = true;
}
} else {
if (cen != cell->lcInfo.cen)
return false;
if (clk != cell->lcInfo.clk)
return false;
if (sr != cell->lcInfo.sr)
return false;
if (dffs_neg != cell->lcInfo.negClk)
return false;
}
}
locals_count += cell->lcInfo.inputCount;
}
return locals_count <= 32;
}
bool Arch::isBelLocationValid(BelId bel) const
{
if (getBelType(bel) == id_ICESTORM_LC) {
std::vector<const CellInfo *> bel_cells;
Loc bel_loc = getBelLocation(bel);
for (auto bel_other : getBelsByTile(bel_loc.x, bel_loc.y)) {
CellInfo *ci_other = getBoundBelCell(bel_other);
if (ci_other != nullptr) {
bel_cells.push_back(ci_other);
}
}
return logicCellsCompatible(bel_cells);
} else {
CellInfo *ci = getBoundBelCell(bel);
if (ci == nullptr)
return true;
else
return isValidBelForCell(ci, bel);
}
}
bool Arch::isValidBelForCell(CellInfo *cell, BelId bel) const
{
if (cell->type == id_ICESTORM_LC) {
NPNR_ASSERT(getBelType(bel) == id_ICESTORM_LC);
std::vector<const CellInfo *> bel_cells;
Loc bel_loc = getBelLocation(bel);
for (auto bel_other : getBelsByTile(bel_loc.x, bel_loc.y)) {
CellInfo *ci_other = getBoundBelCell(bel_other);
if (ci_other != nullptr && bel_other != bel) {
bel_cells.push_back(ci_other);
}
}
bel_cells.push_back(cell);
return logicCellsCompatible(bel_cells);
} else if (cell->type == id_SB_IO) {
// Do not allow placement of input SB_IOs on blocks where there a PLL is outputting to.
// Find shared PLL by looking for driving bel siblings from D_IN_0
// that are a PLL clock output.
auto wire = getBelPinWire(bel, id_D_IN_0);
IdString pll_bel_pin;
BelId pll_bel;
for (auto pin : getWireBelPins(wire)) {
if (pin.pin == id_PLLOUT_A || pin.pin == id_PLLOUT_B) {
pll_bel = pin.bel;
pll_bel_pin = pin.pin;
break;
}
}
// Is there a PLL that shares this IO buffer?
if (pll_bel.index != -1) {
auto pll_cell = getBoundBelCell(pll_bel);
// Is a PLL placed in this PLL bel?
if (pll_cell != nullptr) {
// Is the shared port driving a net?
auto pi = pll_cell->ports[pll_bel_pin];
if (pi.net != nullptr) {
// Are we perhaps a PAD INPUT Bel that can be placed here?
if (pll_cell->attrs[id("BEL_PAD_INPUT")] == getBelName(bel).str(this)) {
return true;
}
return false;
}
}
}
return getBelPackagePin(bel) != "";
} else if (cell->type == id_SB_GB) {
NPNR_ASSERT(cell->ports.at(id_GLOBAL_BUFFER_OUTPUT).net != nullptr);
const NetInfo *net = cell->ports.at(id_GLOBAL_BUFFER_OUTPUT).net;
IdString glb_net = getWireName(getBelPinWire(bel, id_GLOBAL_BUFFER_OUTPUT));
int glb_id = std::stoi(std::string("") + glb_net.str(this).back());
if (net->is_reset && net->is_enable)
return false;
else if (net->is_reset)
return (glb_id % 2) == 0;
else if (net->is_enable)
return (glb_id % 2) == 1;
else
return true;
} else {
// TODO: IO cell clock checks
return true;
}
}
NEXTPNR_NAMESPACE_END
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