The Inter-VM communication (IVC) is a communication protocol, which is
designed for interprocessor communication (IPC) or the communication
between the hypervisor and the virtual machine with a guest OS on it. So
it can be translated as inter-virtual memory or inter-virtual machine
communication. The message channels are maintained on the DRAM or SRAM
and the data coherency should be considered. Or the data could be
corrupted or out of date when the remote client checking it.

Inside the IVC, it maintains memory-based descriptors for the TX/RX
channels and the coherency issue of the counter and payloads. So the
clients can use it to send/receive messages to/from remote ones.

We introduce it as a library for the firmware drivers, which can use it
for IPC.

Based-on-the-work-by:
Peter Newman [off-list ref]

Signed-off-by: Joseph Lo <redacted>
---
Changes in V2:
- None
---
 drivers/firmware/Kconfig        |   1 +
 drivers/firmware/Makefile       |   1 +
 drivers/firmware/tegra/Kconfig  |  13 +
 drivers/firmware/tegra/Makefile |   1 +
 drivers/firmware/tegra/ivc.c    | 659 ++++++++++++++++++++++++++++++++++++++++
 include/soc/tegra/ivc.h         | 102 +++++++
 6 files changed, 777 insertions(+)
 create mode 100644 drivers/firmware/tegra/Kconfig
 create mode 100644 drivers/firmware/tegra/Makefile
 create mode 100644 drivers/firmware/tegra/ivc.c
 create mode 100644 include/soc/tegra/ivc.h

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 5e618058defe..bbd64ae8c4c6 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig

@@ -200,5 +200,6 @@ config HAVE_ARM_SMCCC
 source "drivers/firmware/broadcom/Kconfig"
 source "drivers/firmware/google/Kconfig"
 source "drivers/firmware/efi/Kconfig"
+source "drivers/firmware/tegra/Kconfig"

 endmenu

diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile
index 474bada56fcd..9a4df8171cc4 100644
--- a/drivers/firmware/Makefile
+++ b/drivers/firmware/Makefile

@@ -24,3 +24,4 @@ obj-y                         += broadcom/
 obj-$(CONFIG_GOOGLE_FIRMWARE)  += google/
 obj-$(CONFIG_EFI)              += efi/
 obj-$(CONFIG_UEFI_CPER)                += efi/
+obj-y                          += tegra/

diff --git a/drivers/firmware/tegra/Kconfig b/drivers/firmware/tegra/Kconfig
new file mode 100644
index 000000000000..1fa3e4e136a5
--- /dev/null
+++ b/drivers/firmware/tegra/Kconfig

@@ -0,0 +1,13 @@
+menu "Tegra firmware driver"
+
+config TEGRA_IVC
+       bool "Tegra IVC protocol"

+       depends on ARCH_TEGRA
+       help
+         IVC (Inter-VM Communication) protocol is part of the IPC
+         (Inter Processor Communication) framework on Tegra. It maintains the
+         data and the different commuication channels in SysRAM or RAM and
+         keeps the content is synchronization between host CPU and remote
+         processors.
+
+endmenu

diff --git a/drivers/firmware/tegra/Makefile b/drivers/firmware/tegra/Makefile
new file mode 100644
index 000000000000..92e2153e8173
--- /dev/null
+++ b/drivers/firmware/tegra/Makefile

@@ -0,0 +1 @@
+obj-$(CONFIG_TEGRA_IVC)                += ivc.o

diff --git a/drivers/firmware/tegra/ivc.c b/drivers/firmware/tegra/ivc.c
new file mode 100644
index 000000000000..3e736bb9915a
--- /dev/null
+++ b/drivers/firmware/tegra/ivc.c

@@ -0,0 +1,659 @@
+/*
+ * Copyright (c) 2014-2016, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/module.h>