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cores/timer: Expose uptime_cycles and allow multiple calls to add_uptime.

This commit is contained in:
Florent Kermarrec 2021-04-08 14:36:10 +02:00
parent dbe09341c0
commit 7caed56790
1 changed files with 5 additions and 2 deletions
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5
litex/soc/cores/timer.py
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@ -16,6 +16,7 @@ from litex.soc.integration.doc import ModuleDoc
# Timer -------------------------------------------------------------------------------------------- # Timer --------------------------------------------------------------------------------------------
class Timer(Module, AutoCSR, ModuleDoc): class Timer(Module, AutoCSR, ModuleDoc):
with_uptime = False
"""Timer """Timer
Provides a generic Timer core. Provides a generic Timer core.
@ -87,11 +88,13 @@ class Timer(Module, AutoCSR, ModuleDoc):
self.comb += self.ev.zero.trigger.eq(value != 0) self.comb += self.ev.zero.trigger.eq(value != 0)
def add_uptime(self, width=64): def add_uptime(self, width=64):
if self.with_uptime: return
self.with_uptime = True
self._uptime_latch = CSRStorage(description="Write a ``1`` to latch current Uptime cycles to ``uptime_cycles`` register.") self._uptime_latch = CSRStorage(description="Write a ``1`` to latch current Uptime cycles to ``uptime_cycles`` register.")
self._uptime_cycles = CSRStatus(width, description="Latched Uptime since power-up (in ``sys_clk`` cycles).") self._uptime_cycles = CSRStatus(width, description="Latched Uptime since power-up (in ``sys_clk`` cycles).")
# # # # # #
uptime_cycles = Signal(width, reset_less=True) self.uptime_cycles = uptime_cycles = Signal(width, reset_less=True)
self.sync += uptime_cycles.eq(uptime_cycles + 1) self.sync += uptime_cycles.eq(uptime_cycles + 1)
self.sync += If(self._uptime_latch.re, self._uptime_cycles.status.eq(uptime_cycles)) self.sync += If(self._uptime_latch.re, self._uptime_cycles.status.eq(uptime_cycles))