targets: add minispartan6 (SDRAM working)

targets/minispartan6.py

@@ -0,0 +1,80 @@
+from fractions import Fraction
+
+from migen.fhdl.std import *
+from migen.genlib.resetsync import AsyncResetSynchronizer
+
+from misoclib.mem import sdram
+from misoclib.mem.sdram.module import AS4C16M16
+from misoclib.mem.sdram.phy import gensdrphy
+from misoclib.mem.sdram.core.lasmicon import LASMIconSettings
+from misoclib.mem.flash import spiflash
+from misoclib.soc.sdram import SDRAMSoC
+
+class _CRG(Module):
+	def __init__(self, platform, clk_freq):
+		self.clock_domains.cd_sys = ClockDomain()
+		self.clock_domains.cd_sys_ps = ClockDomain()
+
+		f0 = 32*1e6
+		clk32 = platform.request("clk32")
+		clk32a = Signal()
+		self.specials += Instance("IBUFG", i_I=clk32, o_O=clk32a)
+		clk32b = Signal()
+		self.specials += Instance("BUFIO2", p_DIVIDE=1,
+			p_DIVIDE_BYPASS="TRUE", p_I_INVERT="FALSE",
+			i_I=clk32a, o_DIVCLK=clk32b)
+		f = Fraction(int(clk_freq), int(f0))
+		n, m, p = f.denominator, f.numerator, 8
+		assert f0/n*m == clk_freq
+		pll_lckd = Signal()
+		pll_fb = Signal()
+		pll = Signal(6)
+		self.specials.pll = Instance("PLL_ADV", p_SIM_DEVICE="SPARTAN6",
+			p_BANDWIDTH="OPTIMIZED", p_COMPENSATION="INTERNAL",
+			p_REF_JITTER=.01, p_CLK_FEEDBACK="CLKFBOUT",
+			i_DADDR=0, i_DCLK=0, i_DEN=0, i_DI=0, i_DWE=0, i_RST=0, i_REL=0,
+			p_DIVCLK_DIVIDE=1, p_CLKFBOUT_MULT=m*p//n, p_CLKFBOUT_PHASE=0.,
+			i_CLKIN1=clk32b, i_CLKIN2=0, i_CLKINSEL=1,
+			p_CLKIN1_PERIOD=1e9/f0, p_CLKIN2_PERIOD=0.,
+			i_CLKFBIN=pll_fb, o_CLKFBOUT=pll_fb, o_LOCKED=pll_lckd,
+			o_CLKOUT0=pll[0], p_CLKOUT0_DUTY_CYCLE=.5,
+			o_CLKOUT1=pll[1], p_CLKOUT1_DUTY_CYCLE=.5,
+			o_CLKOUT2=pll[2], p_CLKOUT2_DUTY_CYCLE=.5,
+			o_CLKOUT3=pll[3], p_CLKOUT3_DUTY_CYCLE=.5,
+			o_CLKOUT4=pll[4], p_CLKOUT4_DUTY_CYCLE=.5,
+			o_CLKOUT5=pll[5], p_CLKOUT5_DUTY_CYCLE=.5,
+			p_CLKOUT0_PHASE=0., p_CLKOUT0_DIVIDE=p//1,
+			p_CLKOUT1_PHASE=0., p_CLKOUT1_DIVIDE=p//1,
+			p_CLKOUT2_PHASE=0., p_CLKOUT2_DIVIDE=p//1,
+			p_CLKOUT3_PHASE=0., p_CLKOUT3_DIVIDE=p//1,
+			p_CLKOUT4_PHASE=0., p_CLKOUT4_DIVIDE=p//1, # sys
+			p_CLKOUT5_PHASE=270., p_CLKOUT5_DIVIDE=p//1, # sys_ps
+		)
+		self.specials += Instance("BUFG", i_I=pll[4], o_O=self.cd_sys.clk)
+		self.specials += Instance("BUFG", i_I=pll[5], o_O=self.cd_sys_ps.clk)
+		self.specials += AsyncResetSynchronizer(self.cd_sys, ~pll_lckd)
+
+		self.specials += Instance("ODDR2", p_DDR_ALIGNMENT="NONE",
+			p_INIT=0, p_SRTYPE="SYNC",
+			i_D0=0, i_D1=1, i_S=0, i_R=0, i_CE=1,
+			i_C0=self.cd_sys.clk, i_C1=~self.cd_sys.clk,
+			o_Q=platform.request("sdram_clock"))
+
+class BaseSoC(SDRAMSoC):
+	default_platform = "minispartan6"
+
+	def __init__(self, platform, sdram_controller_settings=LASMIconSettings(), **kwargs):
+		clk_freq = 80*1e6
+		SDRAMSoC.__init__(self, platform, clk_freq,
+			with_integrated_rom=True,
+			sdram_controller_settings=sdram_controller_settings,
+			**kwargs)
+
+		self.submodules.crg = _CRG(platform, clk_freq)
+
+		if not self.with_integrated_main_ram:
+			sdram_module = AS4C16M16(clk_freq)
+			self.submodules.sdrphy = gensdrphy.GENSDRPHY(platform.request("sdram"))
+			self.register_sdram_phy(self.sdrphy, sdram_module.geom_settings, sdram_module.timing_settings)
+
+default_subtarget = BaseSoC