The rpi4 has a secondary sd controller at offset
0xfe340000. This controller appears to be a mostly
compliant SDHCI controller (a newer more bugfree
arasan?). So we should be able to bind the existing
arasan driver to it. This allows the rpi4 to boot
with its normal emmc2->sd card, arasan->wifi 
configuration that is described in the linux DT.

To do this, it appears we should also be tweaking
some of the expansion gpios, and probably telling
the firmware to power everything up. To do that we
sync the vpu mailbox headers, with a more recent
list of the mailbox commands, then extend the rpi
firmware dxe to support some futher gpio/power
commands. Once that is complete we tweak the arasan
driver to use an alternate register base, add a
workaround for a known clock crossing bug, and
set the card voltage. As well as a number of other
tweaks.

Of note, this set does _NOT_ change the HID/CID's
and add the additional emmc2 controller to the
DSDT table. That remains an open item waiting
for a proper set of device ids.


Jeremy Linton (7):
  Platform/RaspberryPi: Update VPU mailbox constants
  Platform/RaspberryPi: Add further mailbox helpers
  Platform/RaspberryPi: Split MMC register defintions
  Platform/RaspberryPi/Arasan: Add write delay and voltage/clock config
  Platform/RaspberryPi/Arasan: Select the correct base frequency
  Platform/RaspberryPi: Power up sd, and tweak GPIOs
  Platform/RaspberryPi: Correct device path removal.

 .../Drivers/ArasanMmcHostDxe/ArasanMmcHostDxe.c    | 131 ++++++++---
 .../Drivers/ArasanMmcHostDxe/ArasanMmcHostDxe.h    |   1 +
 Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c |   9 +
 .../Drivers/RpiFirmwareDxe/RpiFirmwareDxe.c        | 240 ++++++++++++++++++++-
 .../RaspberryPi/Include/IndustryStandard/RpiMbox.h |  94 +++++++-
 .../RaspberryPi/Include/Protocol/RpiFirmware.h     |  25 +++
 .../Library/PlatformBootManagerLib/PlatformBm.c    |   2 +-
 .../Bcm283x/Include/IndustryStandard/Bcm2836Sdio.h |  42 ++--
 8 files changed, 486 insertions(+), 58 deletions(-)

-- 
2.13.7



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