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1 /*
2  * ispvideo.h
3  *
4  * TI OMAP3 ISP - Generic video node
5  *
6  * Copyright (C) 2009-2010 Nokia Corporation
7  *
8  * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
9  *	     Sakari Ailus <sakari.ailus@iki.fi>
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License version 2 as
13  * published by the Free Software Foundation.
14  */
15 
16 #ifndef OMAP3_ISP_VIDEO_H
17 #define OMAP3_ISP_VIDEO_H
18 
19 #include <linux/v4l2-mediabus.h>
20 #include <media/media-entity.h>
21 #include <media/v4l2-dev.h>
22 #include <media/v4l2-fh.h>
23 #include <media/videobuf2-v4l2.h>
24 
25 #define ISP_VIDEO_DRIVER_NAME		"ispvideo"
26 #define ISP_VIDEO_DRIVER_VERSION	"0.0.2"
27 
28 struct isp_device;
29 struct isp_video;
30 struct v4l2_mbus_framefmt;
31 struct v4l2_pix_format;
32 
33 /*
34  * struct isp_format_info - ISP media bus format information
35  * @code: V4L2 media bus format code
36  * @truncated: V4L2 media bus format code for the same format truncated to 10
37  *	bits. Identical to @code if the format is 10 bits wide or less.
38  * @uncompressed: V4L2 media bus format code for the corresponding uncompressed
39  *	format. Identical to @code if the format is not DPCM compressed.
40  * @flavor: V4L2 media bus format code for the same pixel layout but
41  *	shifted to be 8 bits per pixel. =0 if format is not shiftable.
42  * @pixelformat: V4L2 pixel format FCC identifier
43  * @width: Bits per pixel (when transferred over a bus)
44  * @bpp: Bytes per pixel (when stored in memory)
45  */
46 struct isp_format_info {
47 	u32 code;
48 	u32 truncated;
49 	u32 uncompressed;
50 	u32 flavor;
51 	u32 pixelformat;
52 	unsigned int width;
53 	unsigned int bpp;
54 };
55 
56 enum isp_pipeline_stream_state {
57 	ISP_PIPELINE_STREAM_STOPPED = 0,
58 	ISP_PIPELINE_STREAM_CONTINUOUS = 1,
59 	ISP_PIPELINE_STREAM_SINGLESHOT = 2,
60 };
61 
62 enum isp_pipeline_state {
63 	/* The stream has been started on the input video node. */
64 	ISP_PIPELINE_STREAM_INPUT = 1,
65 	/* The stream has been started on the output video node. */
66 	ISP_PIPELINE_STREAM_OUTPUT = 2,
67 	/* At least one buffer is queued on the input video node. */
68 	ISP_PIPELINE_QUEUE_INPUT = 4,
69 	/* At least one buffer is queued on the output video node. */
70 	ISP_PIPELINE_QUEUE_OUTPUT = 8,
71 	/* The input entity is idle, ready to be started. */
72 	ISP_PIPELINE_IDLE_INPUT = 16,
73 	/* The output entity is idle, ready to be started. */
74 	ISP_PIPELINE_IDLE_OUTPUT = 32,
75 	/* The pipeline is currently streaming. */
76 	ISP_PIPELINE_STREAM = 64,
77 };
78 
79 /*
80  * struct isp_pipeline - An ISP hardware pipeline
81  * @field: The field being processed by the pipeline
82  * @error: A hardware error occurred during capture
83  * @entities: Bitmask of entities in the pipeline (indexed by entity ID)
84  */
85 struct isp_pipeline {
86 	struct media_pipeline pipe;
87 	spinlock_t lock;		/* Pipeline state and queue flags */
88 	unsigned int state;
89 	enum isp_pipeline_stream_state stream_state;
90 	struct isp_video *input;
91 	struct isp_video *output;
92 	u32 entities;
93 	unsigned long l3_ick;
94 	unsigned int max_rate;
95 	enum v4l2_field field;
96 	atomic_t frame_number;
97 	bool do_propagation; /* of frame number */
98 	bool error;
99 	struct v4l2_fract max_timeperframe;
100 	struct v4l2_subdev *external;
101 	unsigned int external_rate;
102 	unsigned int external_width;
103 };
104 
105 #define to_isp_pipeline(__e) \
106 	container_of((__e)->pipe, struct isp_pipeline, pipe)
107 
isp_pipeline_ready(struct isp_pipeline * pipe)108 static inline int isp_pipeline_ready(struct isp_pipeline *pipe)
109 {
110 	return pipe->state == (ISP_PIPELINE_STREAM_INPUT |
111 			       ISP_PIPELINE_STREAM_OUTPUT |
112 			       ISP_PIPELINE_QUEUE_INPUT |
113 			       ISP_PIPELINE_QUEUE_OUTPUT |
114 			       ISP_PIPELINE_IDLE_INPUT |
115 			       ISP_PIPELINE_IDLE_OUTPUT);
116 }
117 
118 /**
119  * struct isp_buffer - ISP video buffer
120  * @vb: videobuf2 buffer
121  * @irqlist: List head for insertion into IRQ queue
122  * @dma: DMA address
123  */
124 struct isp_buffer {
125 	struct vb2_v4l2_buffer vb;
126 	struct list_head irqlist;
127 	dma_addr_t dma;
128 };
129 
130 #define to_isp_buffer(buf)	container_of(buf, struct isp_buffer, vb)
131 
132 enum isp_video_dmaqueue_flags {
133 	/* Set if DMA queue becomes empty when ISP_PIPELINE_STREAM_CONTINUOUS */
134 	ISP_VIDEO_DMAQUEUE_UNDERRUN = (1 << 0),
135 	/* Set when queuing buffer to an empty DMA queue */
136 	ISP_VIDEO_DMAQUEUE_QUEUED = (1 << 1),
137 };
138 
139 #define isp_video_dmaqueue_flags_clr(video)	\
140 			({ (video)->dmaqueue_flags = 0; })
141 
142 /*
143  * struct isp_video_operations - ISP video operations
144  * @queue:	Resume streaming when a buffer is queued. Called on VIDIOC_QBUF
145  *		if there was no buffer previously queued.
146  */
147 struct isp_video_operations {
148 	int(*queue)(struct isp_video *video, struct isp_buffer *buffer);
149 };
150 
151 struct isp_video {
152 	struct video_device video;
153 	enum v4l2_buf_type type;
154 	struct media_pad pad;
155 
156 	struct mutex mutex;		/* format and crop settings */
157 	atomic_t active;
158 
159 	struct isp_device *isp;
160 
161 	unsigned int capture_mem;
162 	unsigned int bpl_alignment;	/* alignment value */
163 	unsigned int bpl_zero_padding;	/* whether the alignment is optional */
164 	unsigned int bpl_max;		/* maximum bytes per line value */
165 	unsigned int bpl_value;		/* bytes per line value */
166 	unsigned int bpl_padding;	/* padding at end of line */
167 
168 	/* Pipeline state */
169 	struct isp_pipeline pipe;
170 	struct mutex stream_lock;	/* pipeline and stream states */
171 	bool error;
172 
173 	/* Video buffers queue */
174 	void *alloc_ctx;
175 	struct vb2_queue *queue;
176 	struct mutex queue_lock;	/* protects the queue */
177 	spinlock_t irqlock;		/* protects dmaqueue */
178 	struct list_head dmaqueue;
179 	enum isp_video_dmaqueue_flags dmaqueue_flags;
180 
181 	const struct isp_video_operations *ops;
182 };
183 
184 #define to_isp_video(vdev)	container_of(vdev, struct isp_video, video)
185 
186 struct isp_video_fh {
187 	struct v4l2_fh vfh;
188 	struct isp_video *video;
189 	struct vb2_queue queue;
190 	struct v4l2_format format;
191 	struct v4l2_fract timeperframe;
192 };
193 
194 #define to_isp_video_fh(fh)	container_of(fh, struct isp_video_fh, vfh)
195 #define isp_video_queue_to_isp_video_fh(q) \
196 				container_of(q, struct isp_video_fh, queue)
197 
198 int omap3isp_video_init(struct isp_video *video, const char *name);
199 void omap3isp_video_cleanup(struct isp_video *video);
200 int omap3isp_video_register(struct isp_video *video,
201 			    struct v4l2_device *vdev);
202 void omap3isp_video_unregister(struct isp_video *video);
203 struct isp_buffer *omap3isp_video_buffer_next(struct isp_video *video);
204 void omap3isp_video_cancel_stream(struct isp_video *video);
205 void omap3isp_video_resume(struct isp_video *video, int continuous);
206 struct media_pad *omap3isp_video_remote_pad(struct isp_video *video);
207 
208 const struct isp_format_info *
209 omap3isp_video_format_info(u32 code);
210 
211 #endif /* OMAP3_ISP_VIDEO_H */
212