efinix: fix reset

fix reset on all efinix boards.
To reset the PLL a pulse is needed, which
has to be driven by a clock that is
not generated by the PLL.

Signed-off-by: Fin Maaß <[email protected]>

Author: maass-hamburg

litex_boards/platforms/efinix_t8f81_dev_kit.py

@@ -52,6 +52,7 @@
 
 class Platform(EfinixPlatform):
     default_clk_name = "clk33"
+    default_clk_freq = 33.333e6
     default_clk_period = 1e9/33.333e6
 
     def __init__(self, toolchain="efinity"):

litex_boards/platforms/efinix_titanium_ti60_f225_dev_kit.py

@@ -183,6 +183,7 @@ def rgmii_ethernet_qse_ios(con, n=""):
 
 class Platform(EfinixPlatform):
     default_clk_name   = "clk25"
+    default_clk_freq   = 25e6
     default_clk_period = 1e9/50e6
 
     def __init__(self, toolchain="efinity"):

litex_boards/platforms/efinix_trion_t120_bga576_dev_kit.py

@@ -174,6 +174,7 @@ def usb_pmod_io(pmod):
 
 class Platform(EfinixPlatform):
     default_clk_name   = "clk40"
+    default_clk_freq   = 40e6
     default_clk_period = 1e9/40e6
 
     def __init__(self, toolchain="efinity"):

litex_boards/platforms/efinix_trion_t20_bga256_dev_kit.py

@@ -113,6 +113,7 @@
 
 class Platform(EfinixPlatform):
     default_clk_name   = "clk50"
+    default_clk_freq   = 50e6
     default_clk_period = 1e9/50e6
 
     def __init__(self, toolchain="efinity"):

litex_boards/platforms/efinix_trion_t20_mipi_dev_kit.py

@@ -64,6 +64,7 @@
 
 class Platform(EfinixPlatform):
     default_clk_name   = "clk50"
+    default_clk_freq   = 50e6
     default_clk_period = 1e9/50e6
 
     def __init__(self, toolchain="efinity"):

litex_boards/platforms/efinix_xyloni_dev_kit.py

@@ -71,6 +71,7 @@
 
 class Platform(EfinixPlatform):
     default_clk_name = "clk33"
+    default_clk_freq = 33.333e6
     default_clk_period = 1e9/33.333e6
 
     def __init__(self, toolchain="efinity"):

litex_boards/platforms/jungle_electronics_fireant.py

@@ -49,6 +49,7 @@
 
 class Platform(EfinixPlatform):
     default_clk_name   = "clk33"
+    default_clk_freq   = 33.33e6
     default_clk_period = 1e9/33.33e6
 
     def __init__(self, toolchain="efinity"):

litex_boards/targets/efinix_t8f81_dev_kit.py

@@ -13,6 +13,7 @@
 from migen.genlib.resetsync import AsyncResetSynchronizer
 
 from litex.gen import *
+from litex.gen.genlib.misc import WaitTimer
 
 from litex_boards.platforms import efinix_t8f81_dev_kit
 
@@ -28,16 +29,25 @@ class _CRG(LiteXModule):
     def __init__(self, platform, sys_clk_freq):
         self.rst    = Signal()
         self.cd_sys = ClockDomain()
+        self.cd_rst = ClockDomain(reset_less=True)
 
         # # #
 
         clk33 = platform.request("clk33")
         rst_n = platform.request("user_btn", 0)
 
+        self.comb += self.cd_rst.clk.eq(clk33)
+
+        # A pulse is necessary to do a reset.
+        self.rst_pulse = Signal()
+        self.reset_timer = reset_timer = ClockDomainsRenamer("rst")(WaitTimer(25e-6*platform.default_clk_freq))
+        self.comb += self.rst_pulse.eq(self.rst ^ reset_timer.done)
+        self.comb += reset_timer.wait.eq(self.rst)
+
         # PLL.
         self.pll = pll = TRIONPLL(platform)
-        self.comb += pll.reset.eq(~rst_n | self.rst)
-        pll.register_clkin(clk33, 33.333e6)
+        self.comb += pll.reset.eq(~rst_n | self.rst_pulse)
+        pll.register_clkin(clk33, platform.default_clk_freq)
         pll.create_clkout(self.cd_sys, sys_clk_freq, with_reset=True)
 
 # BaseSoC ------------------------------------------------------------------------------------------

litex_boards/targets/efinix_ti375_c529_dev_kit.py

@@ -10,6 +10,7 @@
 from migen.genlib.resetsync import AsyncResetSynchronizer
 
 from litex.gen import *
+from litex.gen.genlib.misc import WaitTimer
 
 from litex.build.io import DDROutput, SDROutput, SDRTristate
 from litex.build.generic_platform import Subsignal, Pins, Misc, IOStandard
@@ -39,22 +40,31 @@
 
 class _CRG(LiteXModule):
     def __init__(self, platform, sys_clk_freq, cpu_clk_freq):
-        #self.rst    = Signal()
+        self.rst      = Signal()
         self.cd_sys   = ClockDomain()
         self.cd_usb   = ClockDomain()
         self.cd_video = ClockDomain()
         self.cd_cpu   = ClockDomain()
+        self.cd_rst   = ClockDomain(reset_less=True)
 
         # # #
 
         # Clk/Rst.
         clk100 = platform.request("clk100")
         rst_n  = platform.request("user_btn", 0)
 
+        self.comb += self.cd_rst.clk.eq(clk100)
+
+        # A pulse is necessary to do a reset.
+        self.rst_pulse = Signal()
+        self.reset_timer = reset_timer = ClockDomainsRenamer("rst")(WaitTimer(25e-6*platform.default_clk_freq))
+        self.comb += self.rst_pulse.eq(self.rst ^ reset_timer.done)
+        self.comb += reset_timer.wait.eq(self.rst)
+
         # PLL.
         self.pll = pll = TITANIUMPLL(platform)
-        self.comb += pll.reset.eq(~rst_n)
-        pll.register_clkin(clk100, 100e6)
+        self.comb += pll.reset.eq(~rst_n | self.rst_pulse)
+        pll.register_clkin(clk100, platform.default_clk_freq)
         # You can use CLKOUT0 only for clocks with a maximum frequency of 4x
         # (integer) of the reference clock. If all your system clocks do not fall within
         # this range, you should dedicate one unused clock for CLKOUT0.

litex_boards/targets/efinix_titanium_ti60_f225_dev_kit.py

@@ -10,6 +10,7 @@
 from migen.genlib.resetsync import AsyncResetSynchronizer
 
 from litex.gen import *
+from litex.gen.genlib.misc import WaitTimer
 
 from litex_boards.platforms import efinix_titanium_ti60_f225_dev_kit
 
@@ -31,16 +32,25 @@ def __init__(self, platform, sys_clk_freq):
         self.cd_sys      = ClockDomain()
         self.cd_sys2x    = ClockDomain()
         self.cd_sys2x_ps = ClockDomain()
+        self.cd_rst      = ClockDomain(reset_less=True)
 
         # # #
 
         clk25 = platform.request("clk25")
         rst_n = platform.request("user_btn", 0)
 
+        self.comb += self.cd_rst.clk.eq(clk25)
+
+        # A pulse is necessary to do a reset.
+        self.rst_pulse = Signal()
+        self.reset_timer = reset_timer = ClockDomainsRenamer("rst")(WaitTimer(25e-6*platform.default_clk_freq))
+        self.comb += self.rst_pulse.eq(self.rst ^ reset_timer.done)
+        self.comb += reset_timer.wait.eq(self.rst)
+
         # PLL
         self.pll = pll = TITANIUMPLL(platform)
-        self.comb += pll.reset.eq(~rst_n | self.rst)
-        pll.register_clkin(clk25, 25e6)
+        self.comb += pll.reset.eq(~rst_n | self.rst_pulse)
+        pll.register_clkin(clk25, platform.default_clk_freq)
         # You can use CLKOUT0 only for clocks with a maximum frequency of 4x
         # (integer) of the reference clock. If all your system clocks do not fall within
         # this range, you should dedicate one unused clock for CLKOUT0.