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foboot-bitstream: encode spi flash information into platform

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Different platforms have different spi flash sizes and different numbers
of dummy bits to send.  Encode this information in the platform to
simplify spi flash addition.

Signed-off-by: Sean Cross <sean@xobs.io>
This commit is contained in:
Sean Cross 2019-11-24 21:58:38 +08:00
parent c376d30811
commit 405918134e
1 changed files with 10 additions and 7 deletions
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17
hw/foboot-bitstream.py
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@ -50,15 +50,23 @@ class Platform(LatticePlatform):
if revision == "evt":
from litex_boards.partner.platforms.fomu_evt import _io, _connectors
LatticePlatform.__init__(self, "ice40-up5k-sg48", _io, _connectors, toolchain="icestorm")
self.spi_size = 16 * 1024 * 1024
self.spi_dummy = 6
elif revision == "dvt":
from litex_boards.partner.platforms.fomu_pvt import _io, _connectors
LatticePlatform.__init__(self, "ice40-up5k-uwg30", _io, _connectors, toolchain="icestorm")
self.spi_size = 2 * 1024 * 1024
self.spi_dummy = 6
elif revision == "pvt":
from litex_boards.partner.platforms.fomu_pvt import _io, _connectors
LatticePlatform.__init__(self, "ice40-up5k-uwg30", _io, _connectors, toolchain="icestorm")
self.spi_size = 2 * 1024 * 1024
self.spi_dummy = 6
elif revision == "hacker":
from litex_boards.partner.platforms.fomu_hacker import _io, _connectors
LatticePlatform.__init__(self, "ice40-up5k-uwg30", _io, _connectors, toolchain="icestorm")
self.spi_size = 2 * 1024 * 1024
self.spi_dummy = 4
else:
raise ValueError("Unrecognized revision: {}. Known values: evt, dvt, pvt, hacker".format(revision))
@ -200,13 +208,8 @@ class BaseSoC(SoCCore, AutoDoc):
# The litex SPI module supports memory-mapped reads, as well as a bit-banged mode
# for doing writes.
spi_pads = platform.request("spiflash4x")
if spi_pads is not None:
self.submodules.lxspi = spi_flash.SpiFlashDualQuad(spi_pads, dummy=6, endianness="little")
else:
spi_pads = platform.request("spiflash")
self.submodules.lxspi = spi_flash.SpiFlashSingle(spi_pads, dummy=6, endianness="little")
self.register_mem("spiflash", self.mem_map["spiflash"],
self.lxspi.bus, size=2 * 1024 * 1024) # NOTE: EVT is 16 * 1024 * 1024
self.submodules.lxspi = spi_flash.SpiFlashDualQuad(spi_pads, dummy=platform.spi_dummy, endianness="little")
self.register_mem("spiflash", self.mem_map["spiflash"], self.lxspi.bus, size=platform.spi_size)
# Add USB pads, as well as the appropriate USB controller. If no CPU is
# present, use the DummyUsb controller.