[coreboot-gerrit] Change in coreboot[master]: soc/amd/common/block/lpc/spi_dma: Implement SPI DMA functionality

[Raul Rangel (Code Review)]

Attention is currently required from: Jason Glenesk, Marshall Dawson, Eric Peers, Felix Held.
Hello build bot (Jenkins), Jason Glenesk, Marshall Dawson, Felix Held,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/56228

to look at the new patch set (#3).

Change subject: soc/amd/common/block/lpc/spi_dma: Implement SPI DMA functionality
......................................................................

soc/amd/common/block/lpc/spi_dma: Implement SPI DMA functionality

This change will make it so the standard rdev readat call will use the
SPI DMA controller if the alignment is correct, and the transfer size is
larger than 64 bytes.

There is a magic bit that needs to be set for the SPI DMA controller to
function correctly. This is only available in RN/CZN+.

BUG=b:179699789
TEST=Boot guybrush to OS. This reduces loading verstage by 40ms,
verifying RW by 500us and loading romstage by 500 us.

Signed-off-by: Raul E Rangel 
Change-Id: I0be555956581fd82bbe1482d8afa8828c61aaa01
---
M src/soc/amd/common/block/include/amdblocks/lpc.h
M src/soc/amd/common/block/lpc/spi_dma.c
2 files changed, 171 insertions(+), 5 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/28/56228/3