Corstone700: add support for mhuv2 in arm TF-A
Note: This patch implements in-band messaging protocol only.
ARM has launched a next version of MHU i.e. MHUv2 with its latest
subsystems. The main change is that the MHUv2 is now a distributed IP
with different peripheral views (registers) for the sender and receiver.
Another main difference is that MHUv1 duplex channels are now split into
simplex/half duplex in MHUv2. MHUv2 has a configurable number of
communication channels. There is a capability register (MSG_NO_CAP) to
find out how many channels are available in a system.
The register offsets have also changed for STAT, SET & CLEAR registers
from 0x0, 0x8 & 0x10 in MHUv1 to 0x0, 0xC & 0x8 in MHUv2 respectively.
0x0 0x4 0x8 0xC 0x1F
------------------------....-----
| STAT | | | SET | | |
------------------------....-----
Transmit Channel
0x0 0x4 0x8 0xC 0x1F
------------------------....-----
| STAT | | CLR | | | |
------------------------....-----
Receive Channel
The MHU controller can request the receiver to wake-up and once the
request is removed, the receiver may go back to sleep, but the MHU
itself does not actively put a receiver to sleep.
So, in order to wake-up the receiver when the sender wants to send data,
the sender has to set ACCESS_REQUEST register first in order to wake-up
receiver, state of which can be detected using ACCESS_READY register.
ACCESS_REQUEST has an offset of 0xF88 & ACCESS_READY has an offset
of 0xF8C and are accessible only on any sender channel.
This patch adds necessary changes in a new file required to support the
latest MHUv2 controller. This patch also needs an update in DT binding
for ARM MHUv2 as we need a second register base (tx base) which would
be used as the send channel base.
Change-Id: I1455e08b3d88671a191c558790c503eabe07a8e6
Signed-off-by: Tushar Khandelwal <tushar.khandelwal@arm.com>
diff --git a/plat/arm/board/corstone700/platform.mk b/plat/arm/board/corstone700/platform.mk
index bff3589..a4d4f22 100644
--- a/plat/arm/board/corstone700/platform.mk
+++ b/plat/arm/board/corstone700/platform.mk
@@ -1,5 +1,5 @@
#
-# Copyright (c) 2019, Arm Limited and Contributors. All rights reserved.
+# Copyright (c) 2019-2020, Arm Limited and Contributors. All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
#
@@ -11,16 +11,19 @@
plat/arm/common/arm_common.c \
lib/xlat_tables/aarch32/xlat_tables.c \
lib/xlat_tables/xlat_tables_common.c \
- ${CORSTONE700_CPU_LIBS}
+ ${CORSTONE700_CPU_LIBS} \
+ plat/arm/board/corstone700/drivers/mhu/mhu.c
-PLAT_INCLUDES := -Iplat/arm/board/corstone700/include
+PLAT_INCLUDES := -Iplat/arm/board/corstone700/include \
+ -Iinclude/plat/arm/common \
+ -Iplat/arm/board/corstone700/drivers/mhu
NEED_BL32 := yes
-CORSTONE700_GIC_SOURCES := drivers/arm/gic/common/gic_common.c \
- drivers/arm/gic/v2/gicv2_main.c \
- drivers/arm/gic/v2/gicv2_helpers.c \
- plat/common/plat_gicv2.c \
+CORSTONE700_GIC_SOURCES := drivers/arm/gic/common/gic_common.c \
+ drivers/arm/gic/v2/gicv2_main.c \
+ drivers/arm/gic/v2/gicv2_helpers.c \
+ plat/common/plat_gicv2.c \
plat/arm/common/arm_gicv2.c
# BL1/BL2 Image not a part of the capsule Image for Corstone700