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cores/icap/ICAP: Add Register read capability. 

Useful to get some internal status, ex the IDCode or know if the executed bistream
in a multiboot configuration is the operational or fallback one.
This commit is contained in:
Florent Kermarrec 2021-10-04 17:22:57 +02:00
parent 3504904c09
commit 99f3498f2d
2 changed files with 124 additions and 33 deletions
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100
litex/soc/cores/icap.py
View File

@ -1,7 +1,7 @@
#
# This file is part of LiteX.
#
# Copyright (c) 2019-2020 Florent Kermarrec <florent@enjoy-digital.fr>
# Copyright (c) 2019-2021 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause
from enum import IntEnum
@ -73,15 +73,17 @@ class ICAPCMDs(IntEnum):
class ICAP(Module, AutoCSR):
"""ICAP
Allow sending commands to ICAPE2 of Xilinx 7-Series FPGAs.
Allow writing/reading ICAPE2's registers of Xilinx 7-Series FPGAs.
A warm boot can for example be triggered by writing IPROG CMD (0xf) to CMD register (0b100).
"""
def __init__(self, with_csr=True, simulation=False):
self.addr = Signal(5)
self.data = Signal(32)
self.send = Signal()
self.done = Signal()
self.write = Signal()
self.read = Signal()
self.done = Signal()
self.addr = Signal(5)
self.write_data = Signal(32)
self.read_data = Signal(32)
# # #
@ -91,20 +93,18 @@ class ICAP(Module, AutoCSR):
self.sync += icap_clk_counter.eq(icap_clk_counter + 1)
self.sync += self.cd_icap.clk.eq(icap_clk_counter[3])
# Resynchronize send pulse to ICAP domain.
ps_send = PulseSynchronizer("sys", "icap")
self.submodules += ps_send
self.comb += ps_send.i.eq(self.send)
# Generate ICAP bitstream sequence.
self._csib = _csib = Signal(reset=1)
self._rdwrb = _rdwrb = Signal()
self._i = _i = Signal(32)
self._o = _o = Signal(32)
count = Signal(4)
fsm = FSM(reset_state="WAIT")
fsm = ClockDomainsRenamer("icap")(fsm)
fsm = ResetInserter()(fsm)
self.submodules += fsm
self.comb += fsm.reset.eq(~(self.write | self.read))
# Wait User Command.
fsm.act("WAIT",
@ -113,11 +113,8 @@ class ICAP(Module, AutoCSR):
_rdwrb.eq(0),
_i.eq(ICAP_DUMMY),
# Set Done.
self.done.eq(1),
# Wait User Command.
If(ps_send.o,
If(self.write | self.read,
NextValue(count, 0),
NextState("SYNC")
)
@ -136,7 +133,11 @@ class ICAP(Module, AutoCSR):
NextValue(count, count + 1),
If(count == (4-1),
NextValue(count, 0),
NextState("WRITE")
If(self.write,
NextState("WRITE")
).Else(
NextState("READ")
)
)
)
@ -146,7 +147,7 @@ class ICAP(Module, AutoCSR):
_rdwrb.eq(0),
Case(count, {
0 : _i.eq(ICAP_WRITE | (self.addr << 13) | 1), # Set Register.
1 : _i.eq(self.data), # Set Register Data.
1 : _i.eq(self.write_data), # Set Register Data.
2 : _i.eq(ICAP_NOOP), # No Op.
3 : _i.eq(ICAP_NOOP), # No Op.
}),
@ -157,6 +158,29 @@ class ICAP(Module, AutoCSR):
)
)
# Send ICAP Read sequence.
fsm.act("READ",
_csib.eq(0),
_rdwrb.eq(0),
Case(count, {
0 : _i.eq(ICAP_READ | (self.addr << 13) | 1), # Set Register.
1 : _i.eq(ICAP_NOOP), # No Op.
2 : _i.eq(ICAP_NOOP), # No Op.
3 : [_csib.eq(1), _rdwrb.eq(1), _i.eq(ICAP_NOOP)], # Idle + No Op.
4 : [_csib.eq(0), _rdwrb.eq(1), _i.eq(ICAP_NOOP)], # No Op.
5 : [_csib.eq(0), _rdwrb.eq(1), _i.eq(ICAP_NOOP)], # No Op.
6 : [_csib.eq(0), _rdwrb.eq(1), _i.eq(ICAP_NOOP)], # No Op.
7 : [_csib.eq(0), _rdwrb.eq(1), _i.eq(ICAP_NOOP)], # No Op.
8 : [_csib.eq(0), _rdwrb.eq(1), _i.eq(ICAP_NOOP)], # No Op.
}),
NextValue(count, count + 1),
If(count == (8-1),
NextValue(self.read_data, _o),
NextValue(count, 0),
NextState("DESYNC")
)
)
# Send ICAP Desynchronization sequence.
fsm.act("DESYNC",
_csib.eq(0),
@ -170,18 +194,32 @@ class ICAP(Module, AutoCSR):
NextValue(count, count + 1),
If(count == (4-1),
NextValue(count, 0),
NextState("WAIT")
NextState("DONE")
)
)
# Done
fsm.act("DONE",
# Set ICAP in IDLE state.
_csib.eq(1),
_rdwrb.eq(0),
_i.eq(ICAP_DUMMY),
self.done.eq(1)
)
# ICAP Instance.
if not simulation:
_i_icape2 = Signal(32)
_o_icape2 = Signal(32)
self.comb += _i_icape2.eq(Cat(*[_i[8*i:8*(i+1)][::-1] for i in range(4)])),
self.comb += _o.eq(Cat(*[_o_icape2[8*i:8*(i+1)][::-1] for i in range(4)])),
self.specials += Instance("ICAPE2",
p_ICAP_WIDTH = "X32",
i_CLK = ClockSignal("icap"),
i_CSIB = _csib,
i_RDWRB = _rdwrb,
i_I = Cat(*[_i[8*i:8*(i+1)][::-1] for i in range(4)]),
i_I = _i_icape2,
o_O = _o_icape2,
)
# CSR.
@ -189,16 +227,22 @@ class ICAP(Module, AutoCSR):
self.add_csr()
def add_csr(self):
self._addr = CSRStorage(5, reset_less=True, description="ICAP Write Address.")
self._data = CSRStorage(32, reset_less=True, description="ICAP Write Data.")
self._send = CSRStorage(description="ICAP Control.\n\n Write ``1`` send a write command to the ICAP.")
self._done = CSRStatus(reset=1, description="ICAP Status.\n\n Write command done when read as ``1``.")
self._addr = CSRStorage(5, reset_less=True, description="ICAP Address.")
self._data = CSRStorage(32, reset_less=True, description="ICAP Write/Read Data.", write_from_dev=True)
self._write = CSRStorage(description="ICAP Control.\n\n Write ``1`` send a write to the ICAP.")
self._done = CSRStatus(reset=1, description="ICAP Status.\n\n Write command done when read as ``1``.")
self._read = CSRStorage(description="ICAP Control.\n\n Read ``1`` send a read from the ICAP.")
self.comb += [
self.addr.eq(self._addr.storage),
self.data.eq(self._data.storage),
self.send.eq(self._send.re),
self._done.status.eq(self.done)
self.write_data.eq(self._data.storage),
self.write.eq(self._write.storage),
self._done.status.eq(self.done),
self.read.eq(self._read.storage),
If(self.done,
self._data.we.eq(1),
self._data.dat_w.eq(self.read_data)
)
]
def add_reload(self):
@ -212,8 +256,8 @@ class ICAP(Module, AutoCSR):
)
fsm.act("RELOAD",
self.addr.eq(ICAPRegisters.CMD),
self.data.eq(ICAPCMDs.IPROG),
self.send.eq(1),
self.write.eq(1),
self.write_data.eq(ICAPCMDs.IPROG),
)
def add_timing_constraints(self, platform, sys_clk_freq, sys_clk):

57
test/test_icap.py
View File

@ -1,7 +1,7 @@
#
# This file is part of LiteX.
#
# Copyright (c) 2019 Florent Kermarrec <florent@enjoy-digital.fr>
# Copyright (c) 2019-2021 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause
import unittest
@ -10,6 +10,8 @@ from migen import *
from litex.soc.cores.icap import *
# References ---------------------------------------------------------------------------------------
iprog_sequence = [
# csib rdwrb data
"0 0 0xaa995566",
@ -25,18 +27,55 @@ iprog_sequence = [
"0 0 0x20000000",
]
bootsts_sequence = [
# csib rdwrb data
"0 0 0xaa995566",
"0 0 0x20000000",
"0 0 0x20000000",
"0 0 0x2802c001",
"0 0 0x20000000",
"0 0 0x20000000",
"1 1 0x20000000",
"0 1 0x20000000",
"0 1 0x20000000",
"0 1 0x20000000",
"0 1 0x20000000",
"0 0 0x30008001",
"0 0 0x0000000d",
"0 0 0x20000000",
"0 0 0x20000000",
]
# Test ICAP ----------------------------------------------------------------------------------------
class TestICAP(unittest.TestCase):
def test_icap_command_reload(self):
def generator(dut):
# Send IPROG Write Sequence.
yield dut.addr.eq(ICAPRegisters.CMD)
yield dut.data.eq(ICAPCMDs.IPROG)
for i in range(8):
yield dut.write_data.eq(ICAPCMDs.IPROG)
yield dut.write.eq(1)
# Wait.
while not (yield dut.done):
yield
yield dut.send.eq(1)
yield dut.write.eq(0)
# Delay
for i in range(16):
yield
# Send BOOTSTS Read Sequence.
yield dut.addr.eq(ICAPRegisters.BOOTSTS)
yield dut.read.eq(1)
# Wait.
while not (yield dut.done):
yield
yield dut.read.eq(0)
yield
yield dut.send.eq(0)
def check(dut):
# Check IPROG Write Sequence.
while (yield dut._i) != ICAP_SYNC:
yield
for ref_w in iprog_sequence:
@ -45,6 +84,14 @@ class TestICAP(unittest.TestCase):
#print(cur_w)
yield
# Check BOOTSTS Read Sequence.
while (yield dut._i) != ICAP_SYNC:
yield
for ref_w in bootsts_sequence:
cur_w = f"{(yield dut._csib)} {(yield dut._rdwrb)} 0x{(yield dut._i):08x}"
self.assertEqual(ref_w, cur_w)
#print(cur_w)
yield
dut = ICAP(with_csr=False, simulation=True)
clocks = {"sys": 10, "icap": 10}