npcx9: port80: support 4 bytes mode for eSPI host interface

eSPI PUT_IOWR_SHORT protocol can send a max of 4 bytes of data in a
single transaction. This allows the host to send 4 bytes of the Port80
code at one time. This CL sets the bit OFS0_SEL~OFS3_SEL in the DPAR1
register to let the EC hardware put full 4-bytes of Port80 code to
DP80BUF FIFO. It also groups the 4-byte code into a single 32-bits
variable when necessary by analyzing the offset field in the DP80BUF
register.

BRANCH=none
BUG=b:184872297
TEST=build the image with "#define CONFIG_PORT80_PRINT_IN_INT 1";
connect npcx9_evb to the eSPI host emulator; the host sends a
PUT_IOWR_SHORT transaction to IO address 0x80 with 4 bytes of code
"0xEEE20400"; the EC console shows:
	[63.694685 Port 80: 0xeee20400]
Then the host sends a single byte "0xaa" to Port80, the EC console
prints:
	[576.531790 Port 80: 0xaa]

Signed-off-by: Jun Lin <CHLin56@nuvoton.com>
Change-Id: I5dfbc0d08172042cb43d72eeb6f0e7da63feccf0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2847668
Tested-by: CH Lin <chlin56@nuvoton.com>
Reviewed-by: Raul E Rangel <rrangel@chromium.org>
Commit-Queue: CH Lin <chlin56@nuvoton.com>

0 files changed, 0 insertions, 0 deletions