npcx: shi: add the support for SHI module version 2

In npcx7, we introduce an enhanced version of Serial Host Interface
(SHI) module. This CL adds the support for it.
It includes:
1. Increase the size of IBF/OBF from 64 bytes to 128 bytes.
2. Add IBULVL/IBFLVL2 in SHICFG4/SHICFG5 which can configure at which
   level the IBF pointer reaches to trigger an interrupt to core.
   The current setting of these two register fields are:
   IBFLVL  - 64 (half full)
   IBFLVL2 - 8 (the size of host command protocol V3 header)
3. Dedicated CS high/low interrupts.
   In old SHI module, the way to generate CS high interrupt event is via
   EOR bit. However, it has a defect that EOR won't be set to 1 when CS
   is de-asserted if there is no SHI CLK generated. It makes the
   handling of glitch condition more complicated.
   In the new SHI module, we introduce the CS high/low interrupts
   (by enabling the CSnFEN/CSnREEN) to make it easier to handle the
   glitch.

The new SHI module is enabled during SHI initialization when the chip
family is npcx7.

BRANCH=none
BUG=none
TEST=No build errors for "make buildall". Test host command
communication is ok between npcx7 EVB and a host emulator.
Make sure the glitch condition can be detected and handled.
Also test the driver on gru, make sure it won't break the operation of
old SHI module.

Change-Id: If297fd32a0ec2c9e340c60c8f1942868fa978fbc
Signed-off-by: CHLin <CHLIN56@nuvoton.com>
Reviewed-on: https://chromium-review.googlesource.com/607812
Commit-Ready: CH Lin <chlin56@nuvoton.com>
Tested-by: CH Lin <chlin56@nuvoton.com>
Reviewed-by: Randall Spangler <rspangler@chromium.org>

0 files changed, 0 insertions, 0 deletions