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litex/soc/integration/soc: SocRegion: allows to bypass decoding; SoC: add attribute to bypass CSR decoding

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This commit is contained in:
Gwenhael Goavec-Merou 2022-02-15 07:31:19 +01:00
parent 0d2183062d
commit af69c572d8
1 changed files with 6 additions and 3 deletions
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9
litex/soc/integration/soc.py
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@ -59,9 +59,10 @@ def SoCConstant(value):
# SoCRegion ----------------------------------------------------------------------------------------
class SoCRegion:
def __init__(self, origin=None, size=None, mode="rw", cached=True, linker=False):
def __init__(self, origin=None, size=None, mode="rw", cached=True, linker=False, decode=True):
self.logger = logging.getLogger("SoCRegion")
self.origin = origin
self.decode = decode
self.size = size
if size != 2**log2_int(size, False):
self.logger.info("Region size {} internally from {} to {}.".format(
@ -80,7 +81,7 @@ class SoCRegion:
self.logger.error("Origin needs to be aligned on size:")
self.logger.error(self)
raise SoCError()
if (origin == 0) and (size == 2**bus.address_width):
if not self.decode or (origin == 0) and (size == 2**bus.address_width):
return lambda a: True
origin >>= int(log2(bus.data_width//8)) # bytes to words aligned.
size >>= int(log2(bus.data_width//8)) # bytes to words aligned.
@ -747,6 +748,7 @@ class SoC(Module):
self.sys_clk_freq = sys_clk_freq
self.constants = {}
self.csr_regions = {}
self.csr_decode = True
# SoC Bus Handler --------------------------------------------------------------------------
self.submodules.bus = SoCBusHandler(
@ -878,7 +880,8 @@ class SoC(Module):
data_width = self.csr.data_width),
register=register)
csr_size = 2**(self.csr.address_width + 2)
csr_region = SoCRegion(origin=origin, size=csr_size, cached=False)
csr_region = SoCRegion(origin=origin, size=csr_size, cached=False,
decode=self.csr_decode)
bus = getattr(self.csr_bridge, self.bus.standard.replace('-', '_'))
self.bus.add_slave("csr", bus, csr_region)
self.csr.add_master(name="bridge", master=self.csr_bridge.csr)