[Skiboot] [PATCH V2 0/5] capi: Add support for Coherent Accelerator Interface Architecture 2.0

[Christophe Lombard]

This series implements phb4 backend to support card which supports the
Coherent Accelerator Interface Architecture 2.0.

It requires IBM Power9 system and the Power Service Layer, version 9.
The PSL provides the address translation and system memory cache for
CAIA compliant Accelerators.
the PSL attaches to the IBM Processor chip through the PCIe link using
the PSL-specific “CAPI Protocol” Transaction Layer Packets.
The PSL and CAPP communicate using PowerBus packets. 
When using a PCIe link the PCIe Host Bridge (PHB) decodes the CAPI
Protocol Packets from the PSL and forwards them as PowerBus data
packets. The PSL also has an optional DMA feature which allows the AFU
to send native PCIe reads and writes to the Processor.

The code for PHB4 (Caia2) is based on PHB3 (Caia2) for the commun
functionalities as the synchronization of the timebase and the
preload/load of the CAPP microcode.

CAPP Connections for PHB4
• CAPP0 is located in unit EN and is connected to pci-e unit 0 (PHB0).
• CAPP1 is located in unit ES and is connected to pci-e unit 2 (PHB3).

The first patch externalizes the chiptod code. It will be used for PHB3
and PHB4.
The patch 2 moves in a specific file the definitions of the CAPP
registers for PHB3.
The patch 3 initializes the CAPP registers and enables the CAPP Mode of
the PEC.
The patch 4 loads the CAPP microcode for PHB4,
and the patch 5 handles HMI events.

Tested on Simulation environment.

Changelog[v2]
 - Rebase to latest upstream.
 - Integrate comments from Andrew Donnellan and Frederic Barrat.
 - patch3: - Add new functions to cover recovery and disable mode.
	   - Update the initialization of CAPP registers.
 - patch4: - Rewrote the function capp_load_ucode().
	   - Move capi_lock definition to a right place.
	   - Move away from printf to an appropriate prlog macro.
	   - Add CAPP resource ID: CAPP_IDX_NIMBUS_DD10
	   - Trigger a creset to disable CAPI mode on kernel shutdown.

Christophe Lombard (5):
  capi: Externalize capp timebase synchronization
  capi: Move phb3 capp registers to specialized files
  capi: Enable capi mode
  capi: Load capp microcode
  capi: Handle HMI events

 core/hmi.c          | 117 ++++--------
 core/init.c         |   2 +-
 hw/Makefile.inc     |   2 +-
 hw/capp.c           | 238 +++++++++++++++++++++++++
 hw/chiptod.c        |  40 ++---
 hw/fsp/fsp.c        |   2 +
 hw/phb3.c           | 239 +++++--------------------
 hw/phb4.c           | 504 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 include/capp.h      |  62 ++++---
 include/chip.h      |   1 +
 include/chiptod.h   |   4 +-
 include/phb3-capp.h |  52 ++++++
 include/phb4-capp.h |  63 +++++++
 include/phb4-regs.h |   8 +-
 include/phb4.h      |   1 +
 include/skiboot.h   |   3 +-
 16 files changed, 997 insertions(+), 341 deletions(-)
 create mode 100644 hw/capp.c
 create mode 100644 include/phb3-capp.h
 create mode 100644 include/phb4-capp.h

-- 
2.7.4