nvidia-oot: add support for extended IVC driver

Using this patch we are doing below activities:-
1. Use as much as possible source code possible from
   upstream driver.
2. If there is static function that needs to be exported
   to downstream driver then make a local copy of that.
3. add support for extended ivc driver since upstream
   driver does not have support for all required APIs.

Bug 3595577
JIRA ESLC-6884

Signed-off-by: Manish Bhardwaj <mbhardwaj@nvidia.com>
Change-Id: Id6c70525e378a80d9059f49f879909c88c55cb4f
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2764453
Reviewed-by: Suresh Venkatachalam <skathirampat@nvidia.com>
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

include/soc/tegra/ivc_ext.h

@@ -0,0 +1,120 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ */
+
+#ifndef __TEGRA_IVC_EXT_H
+#define __TEGRA_IVC_EXT_H
+
+#include <linux/types.h>
+#include <soc/tegra/ivc.h>
+
+/**
+ * tegra_ivc_channel_notified - notifies the peer device
+ * @ivc		pointer of the IVC channel
+ *
+ * notifies the peer device
+ *
+ * Returns 0 if success else -EAGAIN in case of failure.
+ */
+int tegra_ivc_channel_notified(struct tegra_ivc *ivc);
+
+/**
+ * tegra_ivc_channel_reset - Resets the channel state
+ * @ivc		pointer of the IVC channel
+ *
+ * Resets the channel state
+ */
+void tegra_ivc_channel_reset(struct tegra_ivc *ivc);
+
+/**
+ * tegra_ivc_empty - Checks whether channel is empty or not
+ * @ivc		pointer of the IVC channel
+ *
+ * Checks whether channel is empty or not to read or write
+ *
+ * Returns true if channel is empty to read or write.
+ */
+bool tegra_ivc_empty(struct tegra_ivc *ivc, struct tegra_ivc_header *header);
+
+/**
+ * tegra_ivc_channel_sync - Syncs the IVC channel accross reboots.
+ * @ivc		pointer of the IVC channel
+ *
+ * Syncs the IVC channel accross reboots.
+ *
+ * Returns 0 on success.
+ */
+int tegra_ivc_channel_sync(struct tegra_ivc *ivc);
+
+/**
+ * tegra_ivc_frames_available - Checks number of available frames.
+ * @ivc		pointer of the IVC channel
+ *
+ * Checks number of available frames.
+ *
+ * Returns integer value indicating number of available frames..
+ */
+uint32_t tegra_ivc_frames_available(struct tegra_ivc *ivc, struct tegra_ivc_header *header);
+
+/**
+ * tegra_ivc_can_read - Checks whether we can read from ivc channel
+ * @ivc		pointer of the IVC channel
+ *
+ * Checks whether we can read from ivc channel or not
+ *
+ * Returns 1 for success and 0 for failure.
+ */
+int tegra_ivc_can_read(struct tegra_ivc *ivc);
+
+/**
+ * tegra_ivc_can_write - Checks whether we can write to ivc channel
+ * @ivc		pointer of the IVC channel
+ *
+ * Checks whether we can write to ivc channel or not
+ *
+ * Returns 1 for success and 0 for failure.
+ */
+int tegra_ivc_can_write(struct tegra_ivc *ivc);
+
+/**
+ * tegra_ivc_read - Reads frame form ivc channel
+ * @ivc		pointer of the IVC channel
+ * @usr_buf	user buffer to be updated with data
+ * @buf		kernel buffer to be updated with data
+ * @max_read	max data ro be read form ivc channel
+ *
+ * Reads frame form ivc channel
+ *
+ * Returns no. of bytes read from ivc channel else return error.
+ */
+int tegra_ivc_read(struct tegra_ivc *ivc, void __user *usr_buf, void *buf, size_t max_read);
+
+/**
+ * tegra_ivc_read_peek - Reads frame form ivc channel
+ * @ivc		pointer of the IVC channel
+ * @usr_buf	user buffer to be updated with data
+ * @buf		kernel buffer to be updated with data
+ * @offset	kernel buffer to be updated with data from some offset
+ * @size	max data ro be read form ivc channel
+ *
+ * Reads frame form ivc channel from some offset
+ *
+ * Returns no. of bytes read from ivc channel else return error.
+ */
+int tegra_ivc_read_peek(struct tegra_ivc *ivc, void __user *usr_buf, void *buf, size_t offset, size_t size);
+
+/**
+ * tegra_ivc_write - Writes frame to ivc channel
+ * @ivc		pointer of the IVC channel
+ * @usr_buf	user buffer to e written to ivc channel
+ * @buf		kernel buffer to be written to ivc channel
+ * @size	Data size to be written to ivc channel
+ *
+ * Writes frame to ivc channel
+ *
+ * Returns no. of bytes written to ivc channel else return error.
+ */
+int tegra_ivc_write(struct tegra_ivc *ivc, const void __user *usr_buf, const void *buf, size_t size);
+
+#endif /* __TEGRA_IVC_EXT_H */