Furquan Shaikh uploaded patch set #4 to this change.

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soc/amd/common/block: Add support for configuring eSPI connection to slave

This change adds a helper function espi_setup() which allows SoCs to
configure connection to slave. Most of the configuration is dependent
upon mainboard settings in espi_config done as part of the device
tree. The general flow for setup involves the following steps:
1. Set initial configuration (lowest operating frequency and single mode).
2. Perform in-band reset and set initial configuration since the
settings would be lost by the reset.
3. Read slave capabilities.
4. Set slave configuration based on mainboard settings.
5. Perform eSPI host controller configuration to match the slave
configuration and set polarities for VW interrupts.
6. Perform VW channel setup and deassert PLTRST#.
7. Perform peripheral channel setup.
8. Perform OOB channel setup.
9. Perform flash channel setup.
10. Enable subtractive decoding if requested by mainboard.

BUG=b:153675913

Signed-off-by: Furquan Shaikh <furquan@google.com>
Change-Id: I872ec09cd92e9bb53f22e38d2773f3491355279e
---
M src/soc/amd/common/block/include/amdblocks/espi.h
M src/soc/amd/common/block/lpc/espi_util.c
2 files changed, 691 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/72/41272/4

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