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frontend/dma: Add default CSR values to add_csr. (Allow initializing DMA after reset without software intervention).

This commit is contained in:
Florent Kermarrec 2021-03-03 19:42:40 +01:00
parent 25b64c3374
commit e9d5128811
1 changed files with 12 additions and 12 deletions
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24
litedram/frontend/dma.py
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@ -108,12 +108,12 @@ class LiteDRAMDMAReader(Module, AutoCSR):
data_dequeued.eq(source.valid & source.ready) data_dequeued.eq(source.valid & source.ready)
] ]
def add_csr(self): def add_csr(self, default_base=0, default_length=0, default_start=0, default_loop=0):
self._base = CSRStorage(32) self._base = CSRStorage(32, reset=default_base)
self._length = CSRStorage(32) self._length = CSRStorage(32, reset=default_length)
self._start = CSR() self._start = CSRStorage(reset=default_start)
self._done = CSRStatus() self._done = CSRStatus()
self._loop = CSRStorage() self._loop = CSRStorage(reset=default_loop)
# # # # # #
@ -129,7 +129,7 @@ class LiteDRAMDMAReader(Module, AutoCSR):
self.submodules.fsm = fsm = FSM(reset_state="IDLE") self.submodules.fsm = fsm = FSM(reset_state="IDLE")
fsm.act("IDLE", fsm.act("IDLE",
self._done.status.eq(1), self._done.status.eq(1),
If(self._start.re, If(self._start.storage & (default_start != 0 | self._start.re),
NextValue(offset, 0), NextValue(offset, 0),
NextState("RUN"), NextState("RUN"),
) )
@ -215,15 +215,15 @@ class LiteDRAMDMAWriter(Module, AutoCSR):
wdata.data.eq(fifo.source.data) wdata.data.eq(fifo.source.data)
] ]
def add_csr(self): def add_csr(self, default_base=0, default_length=0, default_start=0, default_loop=0):
self._sink = self.sink self._sink = self.sink
self.sink = stream.Endpoint([("data", self.port.data_width)]) self.sink = stream.Endpoint([("data", self.port.data_width)])
self._base = CSRStorage(32) self._base = CSRStorage(32, reset=default_base)
self._length = CSRStorage(32) self._length = CSRStorage(32, reset=default_length)
self._start = CSR() self._start = CSRStorage(reset=default_start)
self._done = CSRStatus() self._done = CSRStatus()
self._loop = CSRStorage() self._loop = CSRStorage(reset=default_loop)
# # # # # #
@ -239,7 +239,7 @@ class LiteDRAMDMAWriter(Module, AutoCSR):
self.submodules.fsm = fsm = FSM(reset_state="IDLE") self.submodules.fsm = fsm = FSM(reset_state="IDLE")
fsm.act("IDLE", fsm.act("IDLE",
self._done.status.eq(1), self._done.status.eq(1),
If(self._start.re, If(self._start.storage & (default_start != 0 | self._start.re),
NextValue(offset, 0), NextValue(offset, 0),
NextState("RUN"), NextState("RUN"),
) )