import unittest import random from migen import * from litedram.common import * from litedram.frontend.axi import * from test.common import * from litex.gen.sim import * class Burst: def __init__(self, addr, type=burst_types["fixed"], len=0, size=0): self.addr = addr self.type = type self.len = len self.size = size def to_beats(self): r = [] for i in range(self.len + 1): if self.type == burst_types["incr"]: offset = i*2**(self.size) r += [Beat(self.addr + offset)] elif self.type == burst_types["wrap"]: offset = (i*2**(self.size))%((2**self.size)*(self.len)) r += [Beat(self.addr + offset)] else: r += [Beat(self.addr)] return r class Beat: def __init__(self, addr): self.addr = addr class Access(Burst): def __init__(self, addr, data, id, **kwargs): Burst.__init__(self, addr, **kwargs) self.data = data self.id = id class Write(Access): pass class Read(Access): pass class TestAXI(unittest.TestCase): def test_burst2beat(self): def bursts_generator(ax, bursts, valid_rand=50): prng = random.Random(42) for burst in bursts: yield ax.valid.eq(1) yield ax.addr.eq(burst.addr) yield ax.burst.eq(burst.type) yield ax.len.eq(burst.len) yield ax.size.eq(burst.size) while (yield ax.ready) == 0: yield yield ax.valid.eq(0) while prng.randrange(100) < valid_rand: yield yield @passive def beats_checker(ax, beats, ready_rand=50): self.errors = 0 yield ax.ready.eq(0) prng = random.Random(42) for beat in beats: while ((yield ax.valid) and (yield ax.ready)) == 0: if prng.randrange(100) > ready_rand: yield ax.ready.eq(1) else: yield ax.ready.eq(0) yield ax_addr = (yield ax.addr) if ax_addr != beat.addr: self.errors += 1 yield # dut ax_burst = stream.Endpoint(ax_description(32, 32)) ax_beat = stream.Endpoint(ax_description(32, 32)) dut = LiteDRAMAXIBurst2Beat(ax_burst, ax_beat) # generate dut input (bursts) prng = random.Random(42) bursts = [] for i in range(32): bursts.append(Burst(prng.randrange(2**32), burst_types["fixed"], prng.randrange(255), log2_int(32//8))) bursts.append(Burst(prng.randrange(2**32), burst_types["incr"], prng.randrange(255), log2_int(32//8))) bursts.append(Burst(4, burst_types["wrap"], 4-1, log2_int(2))) # generate expexted dut output (beats for reference) beats = [] for burst in bursts: beats += burst.to_beats() # simulation generators = [ bursts_generator(ax_burst, bursts), beats_checker(ax_beat, beats) ] run_simulation(dut, generators, vcd_name="burst2beat.vcd") self.assertEqual(self.errors, 0) def test_axi2native(self, with_random=True): def writes_cmd_generator(axi_port, writes): for write in writes: # send command yield axi_port.aw.valid.eq(1) yield axi_port.aw.addr.eq(write.addr<<2) yield axi_port.aw.burst.eq(write.type) yield axi_port.aw.len.eq(write.len) yield axi_port.aw.size.eq(write.size) yield axi_port.aw.id.eq(write.id) yield while (yield axi_port.aw.ready) == 0: yield yield axi_port.aw.valid.eq(0) def writes_data_generator(axi_port, writes): for write in writes: for i, data in enumerate(write.data): # send data yield axi_port.w.valid.eq(1) if (i == (len(write.data) - 1)): yield axi_port.w.last.eq(1) else: yield axi_port.w.last.eq(0) yield axi_port.w.data.eq(data) yield while (yield axi_port.w.ready) == 0: yield yield axi_port.w.valid.eq(0) def writes_response_generator(axi_port, writes): self.writes_id_errors = 0 yield axi_port.b.ready.eq(1) # always accepting write response for write in writes: # wait response while (yield axi_port.b.valid) == 0: yield if (yield axi_port.b.id) != write.id: self.writes_id_errors += 1 yield def reads_cmd_generator(axi_port, reads): for read in reads: # send command yield axi_port.ar.valid.eq(1) yield axi_port.ar.addr.eq(read.addr<<2) yield axi_port.ar.burst.eq(read.type) yield axi_port.ar.len.eq(read.len) yield axi_port.ar.size.eq(read.size) yield axi_port.ar.id.eq(read.id) yield while (yield axi_port.ar.ready) == 0: yield yield axi_port.ar.valid.eq(0) def reads_response_data_generator(axi_port, reads): self.reads_data_errors = 0 self.reads_id_errors = 0 self.reads_last_errors = 0 yield axi_port.r.ready.eq(1) # always accepting read response yield for read in reads: for i, data in enumerate(read.data): # wait data / response while (yield axi_port.r.valid) == 0: yield if (yield axi_port.r.data) != data: self.reads_data_errors += 1 if (yield axi_port.r.id) != read.id: self.reads_id_errors += 1 if i == (len(read.data) - 1): if (yield axi_port.r.last) != 1: self.reads_last_errors += 1 else: if (yield axi_port.r.last) != 0: self.reads_last_errors += 1 yield # dut axi_port = LiteDRAMAXIPort(32, 32, 8) dram_port = LiteDRAMNativePort("both", 32, 32) dut = LiteDRAMAXI2Native(axi_port, dram_port) mem = DRAMMemory(32, 128) # generate writes/reads prng = random.Random(42) writes = [] for i in range(16): if with_random: # incrementing addr, random data & id writes.append(Write(i, [prng.randrange(2**32) for _ in range(i+1)], prng.randrange(2**8), type=0b00, len=i, size=log2_int(32//8))) else: # incrementing addr, data & id (debug) writes.append(Write(i, [i for _ in range(i+1)], i, type=0b00, len=i, size=log2_int(32//8))) reads = [] for i in range(16): if with_random: # incrementing addr, written data, random id reads.append(Read(i, writes[i].data, prng.randrange(2**8), type=0b00, len=len(writes[i].data)-1, size=log2_int(32//8))) else: # incrementing addr, written data, incrementing id (debug) reads.append(Read(i, writes[i].data, i, type=0b00, len=len(writes[i].data)-1), size=log2_int(32//8)) # simulation generators = [ writes_cmd_generator(axi_port, writes), writes_data_generator(axi_port, writes), writes_response_generator(axi_port, writes), reads_cmd_generator(axi_port, reads), reads_response_data_generator(axi_port, reads), mem.read_handler(dram_port), mem.write_handler(dram_port) ] run_simulation(dut, generators, vcd_name="axi2native.vcd") #mem.show_content() self.assertEqual(self.writes_id_errors, 0) self.assertEqual(self.reads_data_errors, 0) self.assertEqual(self.reads_id_errors, 0) self.assertEqual(self.reads_last_errors, 0)