1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Driver for Renesas R-Car VIN
4  *
5  * Copyright (C) 2016 Renesas Electronics Corp.
6  * Copyright (C) 2011-2013 Renesas Solutions Corp.
7  * Copyright (C) 2013 Cogent Embedded, Inc., <source@cogentembedded.com>
8  * Copyright (C) 2008 Magnus Damm
9  *
10  * Based on the soc-camera rcar_vin driver
11  */
12 
13 #ifndef __RCAR_VIN__
14 #define __RCAR_VIN__
15 
16 #include <linux/kref.h>
17 
18 #include <media/v4l2-async.h>
19 #include <media/v4l2-ctrls.h>
20 #include <media/v4l2-dev.h>
21 #include <media/v4l2-device.h>
22 #include <media/v4l2-fwnode.h>
23 #include <media/videobuf2-v4l2.h>
24 
25 /* Number of HW buffers */
26 #define HW_BUFFER_NUM 3
27 
28 /* Address alignment mask for HW buffers */
29 #define HW_BUFFER_MASK 0x7f
30 
31 /* Max number on VIN instances that can be in a system */
32 #define RCAR_VIN_NUM 32
33 
34 struct rvin_dev;
35 struct rvin_group;
36 
37 enum model_id {
38 	RCAR_H1,
39 	RCAR_M1,
40 	RCAR_GEN2,
41 	RCAR_GEN3,
42 };
43 
44 enum rvin_csi_id {
45 	RVIN_CSI20,
46 	RVIN_CSI21,
47 	RVIN_CSI40,
48 	RVIN_CSI41,
49 	RVIN_CSI_MAX,
50 };
51 
52 enum rvin_isp_id {
53 	RVIN_ISP0,
54 	RVIN_ISP1,
55 	RVIN_ISP2,
56 	RVIN_ISP4,
57 	RVIN_ISP_MAX,
58 };
59 
60 #define RVIN_REMOTES_MAX \
61 	(((unsigned int)RVIN_CSI_MAX) > ((unsigned int)RVIN_ISP_MAX) ? \
62 	 (unsigned int)RVIN_CSI_MAX : (unsigned int)RVIN_ISP_MAX)
63 
64 /**
65  * enum rvin_dma_state - DMA states
66  * @STOPPED:   No operation in progress
67  * @STARTING:  Capture starting up
68  * @RUNNING:   Operation in progress have buffers
69  * @STOPPING:  Stopping operation
70  * @SUSPENDED: Capture is suspended
71  */
72 enum rvin_dma_state {
73 	STOPPED = 0,
74 	STARTING,
75 	RUNNING,
76 	STOPPING,
77 	SUSPENDED,
78 };
79 
80 /**
81  * enum rvin_buffer_type
82  *
83  * Describes how a buffer is given to the hardware. To be able
84  * to capture SEQ_TB/BT it's needed to capture to the same vb2
85  * buffer twice so the type of buffer needs to be kept.
86  *
87  * @FULL: One capture fills the whole vb2 buffer
88  * @HALF_TOP: One capture fills the top half of the vb2 buffer
89  * @HALF_BOTTOM: One capture fills the bottom half of the vb2 buffer
90  */
91 enum rvin_buffer_type {
92 	FULL,
93 	HALF_TOP,
94 	HALF_BOTTOM,
95 };
96 
97 /**
98  * struct rvin_video_format - Data format stored in memory
99  * @fourcc:	Pixelformat
100  * @bpp:	Bytes per pixel
101  */
102 struct rvin_video_format {
103 	u32 fourcc;
104 	u8 bpp;
105 };
106 
107 /**
108  * struct rvin_parallel_entity - Parallel video input endpoint descriptor
109  * @asc:	async connection descriptor for async framework
110  * @subdev:	subdevice matched using async framework
111  * @mbus_type:	media bus type
112  * @bus:	media bus parallel configuration
113  * @source_pad:	source pad of remote subdevice
114  * @sink_pad:	sink pad of remote subdevice
115  *
116  */
117 struct rvin_parallel_entity {
118 	struct v4l2_async_connection *asc;
119 	struct v4l2_subdev *subdev;
120 
121 	enum v4l2_mbus_type mbus_type;
122 	struct v4l2_mbus_config_parallel bus;
123 
124 	unsigned int source_pad;
125 	unsigned int sink_pad;
126 };
127 
128 /**
129  * struct rvin_group_route - describes a route from a channel of a
130  *	CSI-2 receiver to a VIN
131  *
132  * @master:	VIN group master ID.
133  * @csi:	CSI-2 receiver ID.
134  * @chsel:	CHSEL register values that connects VIN group to CSI-2.
135  *
136  * .. note::
137  *	Each R-Car CSI-2 receiver has four output channels facing the VIN
138  *	devices, each channel can carry one CSI-2 Virtual Channel (VC).
139  *	There is no correlation between channel number and CSI-2 VC. It's
140  *	up to the CSI-2 receiver driver to configure which VC is output
141  *	on which channel, the VIN devices only care about output channels.
142  */
143 struct rvin_group_route {
144 	unsigned int master;
145 	enum rvin_csi_id csi;
146 	unsigned int chsel;
147 };
148 
149 /**
150  * struct rvin_info - Information about the particular VIN implementation
151  * @model:		VIN model
152  * @use_mc:		use media controller instead of controlling subdevice
153  * @use_isp:		the VIN is connected to the ISP and not to the CSI-2
154  * @nv12:		support outputing NV12 pixel format
155  * @max_width:		max input width the VIN supports
156  * @max_height:		max input height the VIN supports
157  * @routes:		list of possible routes from the CSI-2 recivers to
158  *			all VINs. The list mush be NULL terminated.
159  * @scaler:		Optional scaler
160  */
161 struct rvin_info {
162 	enum model_id model;
163 	bool use_mc;
164 	bool use_isp;
165 	bool nv12;
166 
167 	unsigned int max_width;
168 	unsigned int max_height;
169 	const struct rvin_group_route *routes;
170 	void (*scaler)(struct rvin_dev *vin);
171 };
172 
173 /**
174  * struct rvin_dev - Renesas VIN device structure
175  * @dev:		(OF) device
176  * @base:		device I/O register space remapped to virtual memory
177  * @info:		info about VIN instance
178  *
179  * @vdev:		V4L2 video device associated with VIN
180  * @v4l2_dev:		V4L2 device
181  * @ctrl_handler:	V4L2 control handler
182  * @notifier:		V4L2 asynchronous subdevs notifier
183  *
184  * @parallel:		parallel input subdevice descriptor
185  *
186  * @group:		Gen3 CSI group
187  * @id:			Gen3 group id for this VIN
188  * @pad:		media pad for the video device entity
189  *
190  * @lock:		protects @queue
191  * @queue:		vb2 buffers queue
192  * @scratch:		cpu address for scratch buffer
193  * @scratch_phys:	physical address of the scratch buffer
194  *
195  * @qlock:		protects @buf_hw, @buf_list, @sequence and @state
196  * @buf_hw:		Keeps track of buffers given to HW slot
197  * @buf_list:		list of queued buffers
198  * @sequence:		V4L2 buffers sequence number
199  * @state:		keeps track of operation state
200  *
201  * @is_csi:		flag to mark the VIN as using a CSI-2 subdevice
202  * @chsel:		Cached value of the current CSI-2 channel selection
203  *
204  * @mbus_code:		media bus format code
205  * @format:		active V4L2 pixel format
206  *
207  * @crop:		active cropping
208  * @compose:		active composing
209  * @scaler:		Optional scaler
210  * @std:		active video standard of the video source
211  *
212  * @alpha:		Alpha component to fill in for supported pixel formats
213  */
214 struct rvin_dev {
215 	struct device *dev;
216 	void __iomem *base;
217 	const struct rvin_info *info;
218 
219 	struct video_device vdev;
220 	struct v4l2_device v4l2_dev;
221 	struct v4l2_ctrl_handler ctrl_handler;
222 	struct v4l2_async_notifier notifier;
223 
224 	struct rvin_parallel_entity parallel;
225 
226 	struct rvin_group *group;
227 	unsigned int id;
228 	struct media_pad pad;
229 
230 	struct mutex lock;
231 	struct vb2_queue queue;
232 	void *scratch;
233 	dma_addr_t scratch_phys;
234 
235 	spinlock_t qlock;
236 	struct {
237 		struct vb2_v4l2_buffer *buffer;
238 		enum rvin_buffer_type type;
239 		dma_addr_t phys;
240 	} buf_hw[HW_BUFFER_NUM];
241 	struct list_head buf_list;
242 	unsigned int sequence;
243 	enum rvin_dma_state state;
244 
245 	bool is_csi;
246 	unsigned int chsel;
247 
248 	u32 mbus_code;
249 	struct v4l2_pix_format format;
250 
251 	struct v4l2_rect crop;
252 	struct v4l2_rect compose;
253 	void (*scaler)(struct rvin_dev *vin);
254 	v4l2_std_id std;
255 
256 	unsigned int alpha;
257 };
258 
259 #define vin_to_source(vin)		((vin)->parallel.subdev)
260 
261 /* Debug */
262 #define vin_dbg(d, fmt, arg...)		dev_dbg(d->dev, fmt, ##arg)
263 #define vin_info(d, fmt, arg...)	dev_info(d->dev, fmt, ##arg)
264 #define vin_warn(d, fmt, arg...)	dev_warn(d->dev, fmt, ##arg)
265 #define vin_err(d, fmt, arg...)		dev_err(d->dev, fmt, ##arg)
266 
267 /**
268  * struct rvin_group - VIN CSI2 group information
269  * @refcount:		number of VIN instances using the group
270  *
271  * @mdev:		media device which represents the group
272  *
273  * @lock:		protects the count, notifier, vin and csi members
274  * @count:		number of enabled VIN instances found in DT
275  * @notifier:		group notifier for CSI-2 async connections
276  * @vin:		VIN instances which are part of the group
277  * @link_setup:		Callback to create all links for the media graph
278  * @remotes:		array of pairs of async connection and subdev pointers
279  *			to all remote subdevices.
280  */
281 struct rvin_group {
282 	struct kref refcount;
283 
284 	struct media_device mdev;
285 
286 	struct mutex lock;
287 	unsigned int count;
288 	struct v4l2_async_notifier notifier;
289 	struct rvin_dev *vin[RCAR_VIN_NUM];
290 
291 	int (*link_setup)(struct rvin_dev *vin);
292 
293 	struct {
294 		struct v4l2_async_connection *asc;
295 		struct v4l2_subdev *subdev;
296 	} remotes[RVIN_REMOTES_MAX];
297 };
298 
299 int rvin_dma_register(struct rvin_dev *vin, int irq);
300 void rvin_dma_unregister(struct rvin_dev *vin);
301 
302 int rvin_v4l2_register(struct rvin_dev *vin);
303 void rvin_v4l2_unregister(struct rvin_dev *vin);
304 
305 const struct rvin_video_format *rvin_format_from_pixel(struct rvin_dev *vin,
306 						       u32 pixelformat);
307 
308 
309 /* Cropping, composing and scaling */
310 void rvin_scaler_gen2(struct rvin_dev *vin);
311 void rvin_scaler_gen3(struct rvin_dev *vin);
312 void rvin_crop_scale_comp(struct rvin_dev *vin);
313 
314 int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel);
315 void rvin_set_alpha(struct rvin_dev *vin, unsigned int alpha);
316 
317 int rvin_start_streaming(struct rvin_dev *vin);
318 void rvin_stop_streaming(struct rvin_dev *vin);
319 
320 #endif
321