From: Robert Jordens <jordens@gmail.com>
Date: Fri, 27 Feb 2015 03:23:03 +0000 (-0700)
Subject: add pipistrello target
X-Git-Tag: 24jan2021_ls180~2595
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2b12679ef65026c7eab76674bc7e981bcd3e54c4;p=litex.git

add pipistrello target
---

diff --git a/targets/pipistrello.py b/targets/pipistrello.py
new file mode 100644
index 00000000..069ff48e
--- /dev/null
+++ b/targets/pipistrello.py
@@ -0,0 +1,105 @@
+from fractions import Fraction
+
+from migen.fhdl.std import *
+from migen.genlib.resetsync import AsyncResetSynchronizer
+
+from misoclib import spiflash, sdram
+from misoclib.sdram.phy import gensdrphy
+from misoclib.gensoc 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 = 50*1000*1000
+		clk50 = platform.request("clk50")
+		clk50a = Signal()
+		self.specials += Instance("IBUFG", i_I=clk50, o_O=clk50a)
+		clk50b = Signal()
+		self.specials += Instance("BUFIO2", p_DIVIDE=1,
+			p_DIVIDE_BYPASS="TRUE", p_I_INVERT="FALSE",
+			i_I=clk50a, o_DIVCLK=clk50b)
+		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=clk50b, i_CLKIN2=0, i_CLKINSEL=1,
+			p_CLKIN1_PERIOD=1/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)
+
+		clk = platform.request("sdram_clock")
+		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=clk.p)
+		self.specials += Instance("ODDR2", p_DDR_ALIGNMENT="NONE",
+			p_INIT=0, p_SRTYPE="SYNC",
+			i_D0=1, i_D1=0, i_S=0, i_R=0, i_CE=1,
+			i_C0=self.cd_sys.clk, i_C1=~self.cd_sys.clk,
+			o_Q=clk.n)
+
+class BaseSoC(SDRAMSoC):
+	default_platform = "pipistrello"
+
+	csr_map = {
+		"spiflash":	10,
+	}
+	csr_map.update(SDRAMSoC.csr_map)
+
+	def __init__(self, platform, **kwargs):
+		clk_freq = 80*1000*1000
+		SDRAMSoC.__init__(self, platform, clk_freq,
+			cpu_reset_address=0x60000, **kwargs)
+
+		self.submodules.crg = _CRG(platform, clk_freq)
+
+		sdram_geom = sdram.GeomSettings(
+			bank_a=2,
+			row_a=12,
+			col_a=8
+		)
+		sdram_timing = sdram.TimingSettings(
+			tRP=self.ns(15),
+			tRCD=self.ns(15),
+			tWR=self.ns(15),
+			tWTR=2,
+			tREFI=self.ns(64*1000*1000/4096, False),
+			tRFC=self.ns(72),
+			req_queue_size=8,
+			read_time=32,
+			write_time=16
+		)
+		self.submodules.sdrphy = gensdrphy.GENSDRPHY(platform.request("sdram"))
+		self.register_sdram_phy(self.sdrphy.dfi, self.sdrphy.phy_settings, sdram_geom, sdram_timing)
+
+		# BIOS is in SPI flash
+		self.submodules.spiflash = spiflash.SpiFlash(platform.request("spiflash2x"), dummy=4, div=6)
+		self.flash_boot_address = 0x70000
+		self.register_rom(self.spiflash.bus)
+
+default_subtarget = BaseSoC