from fractions import Fraction from math import ceil from operator import itemgetter from migen.fhdl.std import * from migen.bus import wishbone, csr, lasmibus, dfi from migen.bus import wishbone2lasmi, wishbone2csr from migen.bank import csrgen from mibuild.generic_platform import ConstraintError from milkymist import mxcrg, lm32, norflash, uart, s6ddrphy, dfii, lasmicon, \ identifier, timer, minimac3, framebuffer, dvisampler, gpio, memtest version = "2.0" clk_freq = (83 + Fraction(1, 3))*1000000 sram_size = 4096 # in bytes l2_size = 8192 # in bytes clk_period_ns = 1000000000/clk_freq def ns(t, margin=True): if margin: t += clk_period_ns/2 return ceil(t/clk_period_ns) sdram_geom = lasmicon.GeomSettings( bank_a=2, row_a=13, col_a=10 ) sdram_timing = lasmicon.TimingSettings( tRP=ns(15), tRCD=ns(15), tWR=ns(15), tWTR=2, tREFI=ns(7800, False), tRFC=ns(70), req_queue_size=8, read_time=32, write_time=16 ) class MXClockPads: def __init__(self, platform): self.clk50 = platform.request("clk50") self.trigger_reset = 0 try: self.trigger_reset = platform.request("user_btn", 1) except ConstraintError: pass self.norflash_rst_n = platform.request("norflash_rst_n") ddram_clock = platform.request("ddram_clock") self.ddr_clk_p = ddram_clock.p self.ddr_clk_n = ddram_clock.n eth_clocks = platform.request("eth_clocks") self.eth_phy_clk = eth_clocks.phy self.eth_rx_clk = eth_clocks.rx self.eth_tx_clk = eth_clocks.tx class SoC(Module): csr_base = 0xe0000000 csr_map = { "crg": 0, "uart": 1, "dfii": 2, "identifier": 3, "timer0": 4, "minimac": 5, "fb": 6, "lasmicon": 7, "dvisampler0": 8, "dvisampler0_edid_mem": 9, "dvisampler1": 10, "dvisampler1_edid_mem": 11, "pots": 12, "buttons": 13, "leds": 14, "memtest_w": 15, "memtest_r": 16 } interrupt_map = { "uart": 0, "timer0": 1, "minimac": 2, "dvisampler0": 3, "dvisampler1": 4, } def __init__(self, platform, platform_name, with_memtest): # # DFI # self.submodules.ddrphy = s6ddrphy.S6DDRPHY(platform.request("ddram"), memtype="DDR", nphases=2, cl=3, rd_bitslip=0, wr_bitslip=3, dqs_ddr_alignment="C1") self.submodules.dfii = dfii.DFIInjector(sdram_geom.mux_a, sdram_geom.bank_a, self.ddrphy.phy_settings.dfi_d, self.ddrphy.phy_settings.nphases) self.submodules.dficon0 = dfi.Interconnect(self.dfii.master, self.ddrphy.dfi) # # LASMI # self.submodules.lasmicon = lasmicon.LASMIcon(self.ddrphy.phy_settings, sdram_geom, sdram_timing) self.submodules.dficon1 = dfi.Interconnect(self.lasmicon.dfi, self.dfii.slave) n_lasmims = 1 # wishbone bridging if platform_name == "mixxeo": n_lasmims += 4 # framebuffer (2-channel mixing) + 2 DVI samplers if platform_name == "m1": n_lasmims += 1 # framebuffer (single channel) if with_memtest: n_lasmims += 2 # writer + reader self.submodules.lasmixbar = lasmibus.Crossbar([self.lasmicon.lasmic], n_lasmims, self.lasmicon.nrowbits) lasmims = list(self.lasmixbar.masters) lasmim_wb = lasmims.pop() if platform_name == "mixxeo": lasmim_fb0, lasmim_fb1, lasmim_dvi0, lasmim_dvi1 = (lasmims.pop() for i in range(4)) if platform_name == "m1": lasmim_fb = lasmims.pop() if with_memtest: lasmim_mtw, lasmim_mtr = lasmims.pop(), lasmims.pop() assert(not lasmims) # # WISHBONE # self.submodules.cpu = lm32.LM32() self.submodules.norflash = norflash.NorFlash(platform.request("norflash"), 12) self.submodules.sram = wishbone.SRAM(sram_size) self.submodules.minimac = minimac3.MiniMAC(platform.request("eth")) self.submodules.wishbone2lasmi = wishbone2lasmi.WB2LASMI(l2_size//4, lasmim_wb) self.submodules.wishbone2csr = wishbone2csr.WB2CSR() # norflash 0x00000000 (shadow @0x80000000) # SRAM/debug 0x10000000 (shadow @0x90000000) # USB 0x20000000 (shadow @0xa0000000) # Ethernet 0x30000000 (shadow @0xb0000000) # SDRAM 0x40000000 (shadow @0xc0000000) # CSR bridge 0x60000000 (shadow @0xe0000000) self.submodules.wishbonecon = wishbone.InterconnectShared( [ self.cpu.ibus, self.cpu.dbus ], [ (lambda a: a[26:29] == 0, self.norflash.bus), (lambda a: a[26:29] == 1, self.sram.bus), (lambda a: a[26:29] == 3, self.minimac.membus), (lambda a: a[27:29] == 2, self.wishbone2lasmi.wishbone), (lambda a: a[27:29] == 3, self.wishbone2csr.wishbone) ], register=True) # # CSR # self.submodules.crg = mxcrg.MXCRG(MXClockPads(platform), clk_freq) self.submodules.uart = uart.UART(platform.request("serial"), clk_freq, baud=115200) self.submodules.identifier = identifier.Identifier(0x4D31, version, int(clk_freq)) self.submodules.timer0 = timer.Timer() if platform_name == "mixxeo": self.submodules.leds = gpio.GPIOOut(platform.request("user_led")) self.submodules.fb = framebuffer.MixFramebuffer(platform.request("vga_out"), platform.request("dvi_out"), lasmim_fb0, lasmim_fb1) self.submodules.dvisampler0 = dvisampler.DVISampler(platform.request("dvi_in", 0), lasmim_dvi0) self.submodules.dvisampler1 = dvisampler.DVISampler(platform.request("dvi_in", 1), lasmim_dvi1) if platform_name == "m1": self.submodules.buttons = gpio.GPIOIn(Cat(platform.request("user_btn", 0), platform.request("user_btn", 2))) self.submodules.leds = gpio.GPIOOut(Cat(*[platform.request("user_led", i) for i in range(2)])) self.submodules.fb = framebuffer.Framebuffer(platform.request("vga"), None, lasmim_fb) if with_memtest: self.submodules.memtest_w = memtest.MemtestWriter(lasmim_mtw) self.submodules.memtest_r = memtest.MemtestReader(lasmim_mtr) self.submodules.csrbankarray = csrgen.BankArray(self, lambda name, memory: self.csr_map[name if memory is None else name + "_" + memory.name_override]) self.submodules.csrcon = csr.Interconnect(self.wishbone2csr.csr, self.csrbankarray.get_buses()) # # Interrupts # for k, v in sorted(self.interrupt_map.items(), key=itemgetter(1)): if hasattr(self, k): self.comb += self.cpu.interrupt[v].eq(getattr(self, k).ev.irq) # # Clocking # self.comb += [ self.ddrphy.clk4x_wr_strb.eq(self.crg.clk4x_wr_strb), self.ddrphy.clk4x_rd_strb.eq(self.crg.clk4x_rd_strb) ]