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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2023 N. Engelhardt <nak@yosyshq.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 "kernel/log.h"
#include "kernel/register.h"
#include "kernel/rtlil.h"
#include "kernel/sigtools.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
// ============================================================================
struct QlBramMergeWorker {
// can be used to record parameter values that have to match on both sides
typedef dict<RTLIL::IdString, RTLIL::Const> MergeableGroupKeyType;
RTLIL::Module *module;
dict<MergeableGroupKeyType, pool<RTLIL::Cell*>> mergeable_groups;
QlBramMergeWorker(RTLIL::Module* module) : module(module)
{
const RTLIL::IdString split_cell_type = ID($__QLF_TDP36K);
for (RTLIL::Cell* cell : module->selected_cells())
{
if(cell->type != split_cell_type) continue;
if(!cell->hasParam(ID(OPTION_SPLIT))) continue;
if(cell->getParam(ID(OPTION_SPLIT)) != RTLIL::Const(1, 32)) continue;
mergeable_groups[get_key(cell)].insert(cell);
}
}
static MergeableGroupKeyType get_key(RTLIL::Cell* cell)
{
MergeableGroupKeyType key;
// For now, there are no restrictions on which cells can be merged
(void) cell;
return key;
}
const dict<RTLIL::IdString, RTLIL::IdString>& param_map(bool second)
{
static const dict<RTLIL::IdString, RTLIL::IdString> bram1_map = {
{ ID(INIT), ID(INIT1) },
{ ID(PORT_A_WIDTH), ID(PORT_A1_WIDTH) },
{ ID(PORT_B_WIDTH), ID(PORT_B1_WIDTH) },
{ ID(PORT_A_WR_BE_WIDTH), ID(PORT_A1_WR_BE_WIDTH) },
{ ID(PORT_B_WR_BE_WIDTH), ID(PORT_B1_WR_BE_WIDTH) }
};
static const dict<RTLIL::IdString, RTLIL::IdString> bram2_map = {
{ ID(INIT), ID(INIT2) },
{ ID(PORT_A_WIDTH), ID(PORT_A2_WIDTH) },
{ ID(PORT_B_WIDTH), ID(PORT_B2_WIDTH) },
{ ID(PORT_A_WR_BE_WIDTH), ID(PORT_A2_WR_BE_WIDTH) },
{ ID(PORT_B_WR_BE_WIDTH), ID(PORT_B2_WR_BE_WIDTH) }
};
if(second)
return bram2_map;
else
return bram1_map;
}
const dict<RTLIL::IdString, RTLIL::IdString>& port_map(bool second)
{
static const dict<RTLIL::IdString, RTLIL::IdString> bram1_map = {
{ ID(PORT_A_CLK), ID(PORT_A1_CLK) },
{ ID(PORT_B_CLK), ID(PORT_B1_CLK) },
{ ID(PORT_A_CLK_EN), ID(PORT_A1_CLK_EN) },
{ ID(PORT_B_CLK_EN), ID(PORT_B1_CLK_EN) },
{ ID(PORT_A_ADDR), ID(PORT_A1_ADDR) },
{ ID(PORT_B_ADDR), ID(PORT_B1_ADDR) },
{ ID(PORT_A_WR_DATA), ID(PORT_A1_WR_DATA) },
{ ID(PORT_B_WR_DATA), ID(PORT_B1_WR_DATA) },
{ ID(PORT_A_WR_EN), ID(PORT_A1_WR_EN) },
{ ID(PORT_B_WR_EN), ID(PORT_B1_WR_EN) },
{ ID(PORT_A_WR_BE), ID(PORT_A1_WR_BE) },
{ ID(PORT_B_WR_BE), ID(PORT_B1_WR_BE) },
{ ID(PORT_A_RD_DATA), ID(PORT_A1_RD_DATA) },
{ ID(PORT_B_RD_DATA), ID(PORT_B1_RD_DATA) }
};
static const dict<RTLIL::IdString, RTLIL::IdString> bram2_map = {
{ ID(PORT_A_CLK), ID(PORT_A2_CLK) },
{ ID(PORT_B_CLK), ID(PORT_B2_CLK) },
{ ID(PORT_A_CLK_EN), ID(PORT_A2_CLK_EN) },
{ ID(PORT_B_CLK_EN), ID(PORT_B2_CLK_EN) },
{ ID(PORT_A_ADDR), ID(PORT_A2_ADDR) },
{ ID(PORT_B_ADDR), ID(PORT_B2_ADDR) },
{ ID(PORT_A_WR_DATA), ID(PORT_A2_WR_DATA) },
{ ID(PORT_B_WR_DATA), ID(PORT_B2_WR_DATA) },
{ ID(PORT_A_WR_EN), ID(PORT_A2_WR_EN) },
{ ID(PORT_B_WR_EN), ID(PORT_B2_WR_EN) },
{ ID(PORT_A_WR_BE), ID(PORT_A2_WR_BE) },
{ ID(PORT_B_WR_BE), ID(PORT_B2_WR_BE) },
{ ID(PORT_A_RD_DATA), ID(PORT_A2_RD_DATA) },
{ ID(PORT_B_RD_DATA), ID(PORT_B2_RD_DATA) }
};
if(second)
return bram2_map;
else
return bram1_map;
}
void merge_brams(RTLIL::Cell* bram1, RTLIL::Cell* bram2)
{
const RTLIL::IdString merged_cell_type = ID($__QLF_TDP36K_MERGED);
// Create the new cell
RTLIL::Cell* merged = module->addCell(NEW_ID, merged_cell_type);
log_debug("Merging split BRAM cells %s and %s -> %s\n", log_id(bram1->name), log_id(bram2->name), log_id(merged->name));
for (auto &it : param_map(false))
{
if(bram1->hasParam(it.first))
merged->setParam(it.second, bram1->getParam(it.first));
}
for (auto &it : param_map(true))
{
if(bram2->hasParam(it.first))
merged->setParam(it.second, bram2->getParam(it.first));
}
for (auto &it : port_map(false))
{
if (bram1->hasPort(it.first))
merged->setPort(it.second, bram1->getPort(it.first));
else
log_error("Can't find port %s on cell %s!\n", log_id(it.first), log_id(bram1->name));
}
for (auto &it : port_map(true))
{
if (bram2->hasPort(it.first))
merged->setPort(it.second, bram2->getPort(it.first));
else
log_error("Can't find port %s on cell %s!\n", log_id(it.first), log_id(bram2->name));
}
merged->attributes = bram1->attributes;
for (auto attr: bram2->attributes)
if (!merged->has_attribute(attr.first))
merged->attributes.insert(attr);
// Remove the old cells
module->remove(bram1);
module->remove(bram2);
}
void merge_bram_groups()
{
for (auto &it : mergeable_groups)
{
while (it.second.size() > 1)
{
merge_brams(it.second.pop(), it.second.pop());
}
}
}
};
struct QlBramMergePass : public Pass {
QlBramMergePass() : Pass("ql_bram_merge", "Infers QuickLogic k6n10f BRAM pairs that can operate independently") {}
void help() override
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" ql_bram_merge [selection]\n");
log("\n");
log(" This pass identifies k6n10f 18K BRAM cells and packs pairs of them together\n");
log(" into a TDP36K cell operating in split mode\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
{
log_header(design, "Executing QL_BRAM_MERGE pass.\n");
size_t argidx = 1;
extra_args(args, argidx, design);
for (RTLIL::Module* module : design->selected_modules())
{
QlBramMergeWorker worker(module);
worker.merge_bram_groups();
}
}
} QlBramMergePass;
PRIVATE_NAMESPACE_END
|
