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mistral: Add the 'pin style' stuff based on Nexus

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Signed-off-by: gatecat <gatecat@ds0.me>
This commit is contained in:
gatecat 2021-05-08 19:28:11 +01:00
parent d38ff14264
commit 1b729d90d0
2 changed files with 112 additions and 0 deletions
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45
mistral/arch.h
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@ -225,6 +225,45 @@ struct ArchRanges : BaseArchRanges
using AllPipsRangeT = AllPipRange;
};
// This enum captures different 'styles' of cell pins
// This is a combination of the modes available for a pin (tied high, low or inverted)
// and the default value to set it to not connected
enum CellPinStyle
{
PINOPT_NONE = 0x0, // no options, just signal as-is
PINOPT_LO = 0x1, // can be tied low
PINOPT_HI = 0x2, // can be tied high
PINOPT_INV = 0x4, // can be inverted
PINOPT_LOHI = 0x3, // can be tied low or high
PINOPT_LOHIINV = 0x7, // can be tied low or high; or inverted
PINOPT_MASK = 0x7,
PINDEF_NONE = 0x00, // leave disconnected
PINDEF_0 = 0x10, // connect to 0 if not used
PINDEF_1 = 0x20, // connect to 1 if not used
PINDEF_MASK = 0x30,
PINGLB_CLK = 0x100, // pin is a 'clock' for global purposes
PINGLB_MASK = 0x100,
PINSTYLE_NONE = 0x000, // default
PINSTYLE_COMB = 0x017, // combinational signal, defaults low, can be inverted and tied
PINSTYLE_CLK = 0x107, // CLK type signal, invertible and defaults to disconnected
PINSTYLE_CE = 0x027, // CE type signal, invertible and defaults to enabled
PINSTYLE_RST = 0x017, // RST type signal, invertible and defaults to not reset
PINSTYLE_DEDI = 0x000, // dedicated signals, leave alone
PINSTYLE_INP = 0x001, // general inputs, no inversion/tieing but defaults low
PINSTYLE_PU = 0x022, // signals that float high and default high
PINSTYLE_CARRY = 0x001, // carry chains can be floating or 0?
};
struct Arch : BaseArch<ArchRanges>
{
ArchArgs args;
@ -410,6 +449,12 @@ struct Arch : BaseArch<ArchRanges>
void assign_default_pinmap(CellInfo *cell);
static const std::unordered_map<IdString, IdString> comb_pinmap;
// -------------------------------------------------
typedef std::unordered_map<IdString, CellPinStyle> CellPinsData; // pins.cc
static const std::unordered_map<IdString, CellPinsData> cell_pins_db; // pins.cc
CellPinStyle get_cell_pin_style(const CellInfo *cell, IdString port) const; // pins.cc
};
NEXTPNR_NAMESPACE_END

67
mistral/pins.cc Normal file
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@ -0,0 +1,67 @@
/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2021 gatecat <gatecat@ds0.me>
*
* 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 "log.h"
#include "nextpnr.h"
#include "util.h"
NEXTPNR_NAMESPACE_BEGIN
const std::unordered_map<IdString, Arch::CellPinsData> Arch::cell_pins_db = {
// For combinational cells, inversion and tieing can be implemented by manipulating the LUT function
{id_MISTRAL_ALUT2, {{{}, PINSTYLE_COMB}}},
{id_MISTRAL_ALUT3, {{{}, PINSTYLE_COMB}}},
{id_MISTRAL_ALUT4, {{{}, PINSTYLE_COMB}}},
{id_MISTRAL_ALUT5, {{{}, PINSTYLE_COMB}}},
{id_MISTRAL_ALUT6, {{{}, PINSTYLE_COMB}}},
{id_MISTRAL_ALUT_ARITH,
{// Leave carry chain alone, other than disconnecting a ground constant
{id_CI, PINSTYLE_CARRY},
{{}, PINSTYLE_COMB}}},
{id_MISTRAL_FF,
{
{id_CLK, PINSTYLE_CLK},
{id_ENA, PINSTYLE_CE},
{id_ACLR, PINSTYLE_RST},
{id_SCLR, PINSTYLE_RST},
{id_SLOAD, PINSTYLE_RST},
{id_SDATA, PINSTYLE_DEDI},
{id_DATAIN, PINSTYLE_INP},
}},
};
CellPinStyle Arch::get_cell_pin_style(const CellInfo *cell, IdString port) const
{
// Look up the pin style in the cell database
auto fnd_cell = cell_pins_db.find(cell->type);
if (fnd_cell == cell_pins_db.end())
return PINSTYLE_NONE;
auto fnd_port = fnd_cell->second.find(port);
if (fnd_port != fnd_cell->second.end())
return fnd_port->second;
// If there isn't an exact port match, then the empty IdString
// represents a wildcard default match
auto fnd_default = fnd_cell->second.find({});
if (fnd_default != fnd_cell->second.end())
return fnd_default->second;
return PINSTYLE_NONE;
}
NEXTPNR_NAMESPACE_END