Hardware
/
litex
mirror of https://github.com/enjoy-digital/litex.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Make it harder to have conflicting interrupts.

This commit is contained in:
Tim 'mithro' Ansell 2017-10-29 10:52:46 -07:00
parent ff72757b87
commit 295e78ee9e
1 changed files with 39 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
litex/soc/integration/soc_core.py
View File

@ -35,7 +35,8 @@ class SoCCore(Module):
"buttons": 5, # user
"leds": 6, # user
}
interrupt_map = {
interrupt_map = {}
soc_interrupt_map = {
"nmi": 0, # Reserve zero for "non-maskable interrupt"
"timer0": 1, # LiteX Timer
"uart": 2, # LiteX UART (IRQ 2 for UART matches mor1k standard config).
@ -124,6 +125,8 @@ class SoCCore(Module):
else:
self.submodules.uart_phy = uart.RS232PHY(platform.request("serial"), clk_freq, uart_baudrate)
self.submodules.uart = uart.UART(self.uart_phy)
else:
del self.soc_interrupt_map["uart"]
if ident:
if ident_version:
@ -134,6 +137,33 @@ class SoCCore(Module):
if with_timer:
self.submodules.timer0 = timer.Timer()
else:
del self.soc_interrupt_map["timer0"]
# Invert the interrupt map.
interrupt_rmap = {}
for mod_name, interrupt in self.interrupt_map.items():
assert interrupt not in interrupt_rmap, (
"Interrupt vector conflict for IRQ %s, user defined %s conflicts with user defined %s" % (
interrupt, mod_name, interrupt_rmap[interrupt]))
interrupt_rmap[interrupt] = mod_name
# Add the base SoC's interrupt map
for mod_name, interrupt in self.soc_interrupt_map.items():
assert interrupt not in interrupt_rmap, (
"Interrupt vector conflict for IRQ %s, user defined %s conflicts with SoC inbuilt %s" % (
interrupt, mod_name, interrupt_rmap[interrupt]))
self.interrupt_map[mod_name] = interrupt
interrupt_rmap[interrupt] = mod_name
# Make sure other functions are not using this value.
self.soc_interrupt_map = None
# Save the interrupt reverse map
self.interrupt_rmap = interrupt_rmap
def add_cpu_or_bridge(self, cpu_or_bridge):
if self.finalized:
@ -193,7 +223,7 @@ class SoCCore(Module):
def get_constants(self):
r = []
for name, interrupt in sorted(self.interrupt_map.items(), key=itemgetter(1)):
for interrupt, name in sorted(self.interrupt_rmap.items()):
r.append((name.upper() + "_INTERRUPT", interrupt))
r += self._constants
return r
@ -235,9 +265,13 @@ class SoCCore(Module):
# Interrupts
if hasattr(self.cpu_or_bridge, "interrupt"):
for k, v in sorted(self.interrupt_map.items(), key=itemgetter(1)):
if hasattr(self, k):
self.comb += self.cpu_or_bridge.interrupt[v].eq(getattr(self, k).ev.irq)
for interrupt, mod_name in sorted(self.interrupt_rmap.items()):
if mod_name == "nmi":
continue
assert hasattr(self, mod_name), "Missing module for interrupt %s" % mod_name
mod_impl = getattr(self, mod_name)
assert hasattr(mod_impl, 'ev'), "Submodule %s does not have EventManager (xx.ev) module" % mod_name
self.comb += self.cpu_or_bridge.interrupt[interrupt].eq(mod_impl.ev.irq)
def build(self, *args, **kwargs):
return self.platform.build(self, *args, **kwargs)