147 lines
4.0 KiB
Python
147 lines
4.0 KiB
Python
from fractions import Fraction
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from math import ceil
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from migen.fhdl.structure import *
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from migen.fhdl import verilog, autofragment
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from migen.bus import wishbone, wishbone2asmi, csr, wishbone2csr, dfi
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from milkymist import m1crg, lm32, norflash, uart, s6ddrphy, dfii, asmicon, \
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identifier, timer, minimac3, framebuffer, asmiprobe
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from cmacros import get_macros
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MHz = 1000000
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clk_freq = (83 + Fraction(1, 3))*MHz
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sram_size = 4096 # in bytes
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l2_size = 8192 # in bytes
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clk_period_ns = 1000000000/clk_freq
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def ns(t, margin=True):
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if margin:
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t += clk_period_ns/2
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return ceil(t/clk_period_ns)
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sdram_phy = asmicon.PhySettings(
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dfi_d=64,
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nphases=2,
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rdphase=0,
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wrphase=1
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)
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sdram_geom = asmicon.GeomSettings(
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bank_a=2,
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row_a=13,
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col_a=10
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)
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sdram_timing = asmicon.TimingSettings(
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tRP=ns(15),
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tRCD=ns(15),
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tWR=ns(15),
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tREFI=ns(7800, False),
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tRFC=ns(70),
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CL=3,
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rd_delay=4,
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read_time=32,
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write_time=16
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)
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csr_macros = get_macros("common/csrbase.h")
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def csr_offset(name):
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base = int(csr_macros[name + "_BASE"], 0)
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assert((base >= 0xe0000000) and (base <= 0xe0010000))
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return (base - 0xe0000000)//0x800
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interrupt_macros = get_macros("common/interrupt.h")
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def interrupt_n(name):
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return int(interrupt_macros[name + "_INTERRUPT"], 0)
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version = get_macros("common/version.h")["VERSION"][1:-1]
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class SoC:
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def __init__(self):
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#
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# ASMI
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#
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self.asmicon = asmicon.ASMIcon(sdram_phy, sdram_geom, sdram_timing)
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asmiport_wb = self.asmicon.hub.get_port()
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asmiport_fb = self.asmicon.hub.get_port(2)
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self.asmicon.finalize()
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#
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# DFI
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#
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self.ddrphy = s6ddrphy.S6DDRPHY(sdram_geom.mux_a, sdram_geom.bank_a, sdram_phy.dfi_d)
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self.dfii = dfii.DFIInjector(csr_offset("DFII"),
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sdram_geom.mux_a, sdram_geom.bank_a, sdram_phy.dfi_d, sdram_phy.nphases)
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self.dficon0 = dfi.Interconnect(self.dfii.master, self.ddrphy.dfi)
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self.dficon1 = dfi.Interconnect(self.asmicon.dfi, self.dfii.slave)
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#
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# WISHBONE
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#
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self.cpu = lm32.LM32()
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self.norflash = norflash.NorFlash(25, 12)
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self.sram = wishbone.SRAM(sram_size)
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self.minimac = minimac3.MiniMAC(csr_offset("MINIMAC"))
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self.wishbone2asmi = wishbone2asmi.WB2ASMI(l2_size//4, asmiport_wb)
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self.wishbone2csr = wishbone2csr.WB2CSR()
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# norflash 0x00000000 (shadow @0x80000000)
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# SRAM/debug 0x10000000 (shadow @0x90000000)
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# USB 0x20000000 (shadow @0xa0000000)
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# Ethernet 0x30000000 (shadow @0xb0000000)
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# SDRAM 0x40000000 (shadow @0xc0000000)
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# CSR bridge 0x60000000 (shadow @0xe0000000)
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self.wishbonecon = wishbone.InterconnectShared(
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[
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self.cpu.ibus,
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self.cpu.dbus
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], [
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(lambda a: a[26:29] == 0, self.norflash.bus),
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(lambda a: a[26:29] == 1, self.sram.bus),
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(lambda a: a[26:29] == 3, self.minimac.membus),
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(lambda a: a[27:29] == 2, self.wishbone2asmi.wishbone),
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(lambda a: a[27:29] == 3, self.wishbone2csr.wishbone)
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],
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register=True)
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#
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# CSR
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#
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self.uart = uart.UART(csr_offset("UART"), clk_freq, baud=115200)
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self.identifier = identifier.Identifier(csr_offset("ID"), 0x4D31, version, int(clk_freq))
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self.timer = timer.Timer(csr_offset("TIMER0"))
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self.fb = framebuffer.Framebuffer(csr_offset("FB"), asmiport_fb)
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self.asmiprobe = asmiprobe.ASMIprobe(csr_offset("ASMIPROBE"), self.asmicon.hub)
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self.csrcon = csr.Interconnect(self.wishbone2csr.csr, [
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self.uart.bank.bus,
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self.dfii.bank.bus,
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self.identifier.bank.bus,
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self.timer.bank.bus,
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self.minimac.bank.bus,
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self.fb.bank.bus,
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self.asmiprobe.bank.bus
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])
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#
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# Clocking
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#
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self.crg = m1crg.M1CRG(50*MHz, clk_freq)
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def get_fragment(self):
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comb = [
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#
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# Interrupts
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#
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self.cpu.interrupt[interrupt_n("UART")].eq(self.uart.events.irq),
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self.cpu.interrupt[interrupt_n("TIMER0")].eq(self.timer.events.irq),
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self.cpu.interrupt[interrupt_n("MINIMAC")].eq(self.minimac.events.irq),
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#
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# DDR PHY strobes
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#
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self.ddrphy.clk4x_wr_strb.eq(self.crg.clk4x_wr_strb),
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self.ddrphy.clk4x_rd_strb.eq(self.crg.clk4x_rd_strb)
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]
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glue = Fragment(comb)
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return glue + autofragment.from_attributes(self)
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