targets/kc705: use PLL for clocking

targets/kc705.py

@@ -3,26 +3,50 @@ from migen.bus import wishbone
 
 from misoclib.gensoc import GenSoC, IntegratedBIOS
 
+class _CRG(Module):
+	def __init__(self, platform):
+		self.clock_domains.cd_sys = ClockDomain()
+
+		clk200 = platform.request("clk200")
+		clk200_se = Signal()
+		self.specials += Instance("IBUFDS", i_I=clk200.p, i_IB=clk200.n, o_O=clk200_se)
+
+		pll_locked = Signal()
+		pll_fb = Signal()
+		pll_clk1x = Signal()
+		self.specials += Instance("PLLE2_BASE",
+			p_STARTUP_WAIT="FALSE", o_LOCKED=pll_locked,
+
+			# VCO @ 1GHz
+			p_REF_JITTER1=0.01, p_CLKIN1_PERIOD=5.0,
+			p_CLKFBOUT_MULT=5, p_DIVCLK_DIVIDE=1,
+			i_CLKIN1=clk200_se, i_CLKFBIN=pll_fb, o_CLKFBOUT=pll_fb,
+
+			# 125MHz
+			p_CLKOUT0_DIVIDE=8, p_CLKOUT0_PHASE=0.0, o_CLKOUT0=pll_clk1x,
+
+			p_CLKOUT1_DIVIDE=4, p_CLKOUT1_PHASE=270.0, #o_CLKOUT1=,
+
+			p_CLKOUT2_DIVIDE=2, p_CLKOUT2_PHASE=0.0, #o_CLKOUT2=,
+
+			p_CLKOUT3_DIVIDE=2, p_CLKOUT3_PHASE=0.0, #o_CLKOUT3=,
+
+			p_CLKOUT4_DIVIDE=4, p_CLKOUT4_PHASE=0.0, #o_CLKOUT4=
+		)
+		self.specials += Instance("BUFG", i_I=pll_clk1x, o_O=self.cd_sys.clk)
+		self.specials += Instance("FD", p_INIT=1, i_D=~pll_locked,
+			i_C=self.cd_sys.clk, o_Q=self.cd_sys.rst)
+
 class BaseSoC(GenSoC, IntegratedBIOS):
 	default_platform = "kc705"
 
 	def __init__(self, platform, **kwargs):
 		GenSoC.__init__(self, platform,
-			clk_freq=156*1000000, cpu_reset_address=0,
+			clk_freq=125*1000000, cpu_reset_address=0,
 			**kwargs)
 		IntegratedBIOS.__init__(self)
 
-		clk200 = platform.request("clk156")
+		self.submodules.crg = _CRG(platform)
-		self.specials += Instance("IBUFGDS",
-				i_I=clk200.p,
-				i_IB=clk200.n,
-				o_O=ClockSignal()
-		)
-		self.clock_domains.cd_sys = ClockDomain()
-		self.clock_domains.cd_pwr_on = ClockDomain(reset_less=True)
-		self.comb += self.cd_pwr_on.clk.eq(self.cd_sys.clk)
-		self.cd_sys.rst.reset = 1
-		self.sync.pwr_on += self.cd_sys.rst.eq(0)
 
 		self.submodules.usermem = wishbone.SRAM(64*1024)
 		self.add_wb_slave(lambda a: a[27:29] == 2, self.usermem.bus)