media: camss: Add VFE files

These files control the VFE module. The VFE has different input
interfaces. The PIX input interface feeds the input data to an image
processing pipeline. Three RDI input interfaces bypass the image
processing pipeline. The VFE also contains the AXI bus interface which
writes the output data to memory.

RDI interfaces are supported in this version. PIX interface is not
supported.
Signed-off-by: Todor Tomov <todor.tomov@linaro.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/qcom/camss-8x16/camss-vfe.h

+/*
+ * camss-vfe.h
+ *
+ * Qualcomm MSM Camera Subsystem - VFE Module
+ *
+ * Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
+ * Copyright (C) 2015-2017 Linaro Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+#ifndef QC_MSM_CAMSS_VFE_H
+#define QC_MSM_CAMSS_VFE_H
+
+#include <linux/clk.h>
+#include <linux/spinlock_types.h>
+#include <media/media-entity.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-subdev.h>
+
+#include "camss-video.h"
+
+#define MSM_VFE_PAD_SINK 0
+#define MSM_VFE_PAD_SRC 1
+#define MSM_VFE_PADS_NUM 2
+
+#define MSM_VFE_LINE_NUM 3
+#define MSM_VFE_IMAGE_MASTERS_NUM 7
+
+#define MSM_VFE_VFE0_UB_SIZE 1023
+#define MSM_VFE_VFE0_UB_SIZE_RDI (MSM_VFE_VFE0_UB_SIZE / 3)
+#define MSM_VFE_VFE1_UB_SIZE 1535
+#define MSM_VFE_VFE1_UB_SIZE_RDI (MSM_VFE_VFE1_UB_SIZE / 3)
+
+enum vfe_output_state {
+	VFE_OUTPUT_OFF,
+	VFE_OUTPUT_RESERVED,
+	VFE_OUTPUT_SINGLE,
+	VFE_OUTPUT_CONTINUOUS,
+	VFE_OUTPUT_IDLE,
+	VFE_OUTPUT_STOPPING
+};
+
+enum vfe_line_id {
+	VFE_LINE_NONE = -1,
+	VFE_LINE_RDI0 = 0,
+	VFE_LINE_RDI1 = 1,
+	VFE_LINE_RDI2 = 2
+};
+
+struct vfe_output {
+	u8 wm_idx;
+
+	int active_buf;
+	struct camss_buffer *buf[2];
+	struct camss_buffer *last_buffer;
+	struct list_head pending_bufs;
+
+	unsigned int drop_update_idx;
+
+	enum vfe_output_state state;
+	unsigned int sequence;
+};
+
+struct vfe_line {
+	enum vfe_line_id id;
+	struct v4l2_subdev subdev;
+	struct media_pad pads[MSM_VFE_PADS_NUM];
+	struct v4l2_mbus_framefmt fmt[MSM_VFE_PADS_NUM];
+	struct camss_video video_out;
+	struct vfe_output output;
+};
+
+struct vfe_device {
+	u8 id;
+	void __iomem *base;
+	u32 irq;
+	char irq_name[30];
+	struct clk **clock;
+	int nclocks;
+	struct completion reset_complete;
+	struct completion halt_complete;
+	struct mutex power_lock;
+	int power_count;
+	struct mutex stream_lock;
+	int stream_count;
+	spinlock_t output_lock;
+	enum vfe_line_id wm_output_map[MSM_VFE_IMAGE_MASTERS_NUM];
+	struct vfe_line line[MSM_VFE_LINE_NUM];
+	u32 reg_update;
+	u8 was_streaming;
+};
+
+struct resources;
+
+int msm_vfe_subdev_init(struct vfe_device *vfe, const struct resources *res);
+
+int msm_vfe_register_entities(struct vfe_device *vfe,
+			      struct v4l2_device *v4l2_dev);
+
+void msm_vfe_unregister_entities(struct vfe_device *vfe);
+
+void msm_vfe_get_vfe_id(struct media_entity *entity, u8 *id);
+void msm_vfe_get_vfe_line_id(struct media_entity *entity, enum vfe_line_id *id);
+
+void msm_vfe_stop_streaming(struct vfe_device *vfe);
+
+#endif /* QC_MSM_CAMSS_VFE_H */