NX: Add P9 NX support for gzip compression engine

Power 9 introduces NX gzip compression engine. This patch adds gzip
compression support in NX. Virtual Accelerator Switch (VAS) is used to
access NX gzip engine and the channel configuration will be done with
the receive FIFO. So RxFIFO address, logical partition ID (lpid),
process ID (pid) and thread ID (tid) are used to configure RxFIFO.
P9 NX supports high and normal priority FIFOS. Skiboot configures User
Mode Access Control (UMAC) noitify match register with these values and
also enables other registers to enable / disable the engine.

Creates the following device-tree entries to provide RxFIFO address,
RxFIFO size, Fifo priority, lpid, pid and tid values so that kernel
can drive P9 NX gzip engine.

The following nodes are located under an xscom node:
   /xscom@<xscom_addr>/nx@<nx_addr>

   /ibm,gzip-high-fifo		: High priority gzip RxFIFO
   /ibm,gzip-normal-fifo	: Normal priority gzip RxFIFO

Each RxFIFO node contains:
   compatible		: ibm,p9-nx-gzip
   priority		: High or Normal
   rx-fifo-address	: RxFIFO address
   rx-fifo-size		: RxFIFO size
   lpid			: 0xfff (1's for 12 bits in UMAC notify match
					register)
   pid			: gzip coprocessor type
   tid			: counter for gzip

Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/hw/Makefile.inc b/hw/Makefile.inc
index e7637674..40be37f5 100644
--- a/hw/Makefile.inc
+++ b/hw/Makefile.inc
@@ -2,7 +2,7 @@
 SUBDIRS += hw
 HW_OBJS  = xscom.o chiptod.o gx.o cec.o lpc.o lpc-uart.o psi.o
 HW_OBJS += homer.o slw.o occ.o fsi-master.o centaur.o imc.o
-HW_OBJS += nx.o nx-rng.o nx-crypto.o nx-compress.o nx-842.o
+HW_OBJS += nx.o nx-rng.o nx-crypto.o nx-compress.o nx-842.o nx-gzip.o
 HW_OBJS += p7ioc.o p7ioc-inits.o p7ioc-phb.o
 HW_OBJS += phb3.o sfc-ctrl.o fake-rtc.o bt.o p8-i2c.o prd.o
 HW_OBJS += dts.o lpc-rtc.o npu.o npu-hw-procedures.o xive.o phb4.o