1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * vsp1_hgt.c  --  R-Car VSP1 Histogram Generator 2D
4  *
5  * Copyright (C) 2016 Renesas Electronics Corporation
6  *
7  * Contact: Niklas Söderlund (niklas.soderlund@ragnatech.se)
8  */
9 
10 #include <linux/device.h>
11 #include <linux/gfp.h>
12 
13 #include <media/v4l2-subdev.h>
14 #include <media/videobuf2-vmalloc.h>
15 
16 #include "vsp1.h"
17 #include "vsp1_dl.h"
18 #include "vsp1_hgt.h"
19 
20 #define HGT_DATA_SIZE				((2 +  6 * 32) * 4)
21 
22 /* -----------------------------------------------------------------------------
23  * Device Access
24  */
25 
26 static inline u32 vsp1_hgt_read(struct vsp1_hgt *hgt, u32 reg)
27 {
28 	return vsp1_read(hgt->histo.entity.vsp1, reg);
29 }
30 
31 static inline void vsp1_hgt_write(struct vsp1_hgt *hgt,
32 				  struct vsp1_dl_body *dlb, u32 reg, u32 data)
33 {
34 	vsp1_dl_body_write(dlb, reg, data);
35 }
36 
37 /* -----------------------------------------------------------------------------
38  * Frame End Handler
39  */
40 
41 void vsp1_hgt_frame_end(struct vsp1_entity *entity)
42 {
43 	struct vsp1_hgt *hgt = to_hgt(&entity->subdev);
44 	struct vsp1_histogram_buffer *buf;
45 	unsigned int m;
46 	unsigned int n;
47 	u32 *data;
48 
49 	buf = vsp1_histogram_buffer_get(&hgt->histo);
50 	if (!buf)
51 		return;
52 
53 	data = buf->addr;
54 
55 	*data++ = vsp1_hgt_read(hgt, VI6_HGT_MAXMIN);
56 	*data++ = vsp1_hgt_read(hgt, VI6_HGT_SUM);
57 
58 	for (m = 0; m < 6; ++m)
59 		for (n = 0; n < 32; ++n)
60 			*data++ = vsp1_hgt_read(hgt, VI6_HGT_HISTO(m, n));
61 
62 	vsp1_histogram_buffer_complete(&hgt->histo, buf, HGT_DATA_SIZE);
63 }
64 
65 /* -----------------------------------------------------------------------------
66  * Controls
67  */
68 
69 #define V4L2_CID_VSP1_HGT_HUE_AREAS	(V4L2_CID_USER_BASE | 0x1001)
70 
71 static int hgt_hue_areas_try_ctrl(struct v4l2_ctrl *ctrl)
72 {
73 	const u8 *values = ctrl->p_new.p_u8;
74 	unsigned int i;
75 
76 	/*
77 	 * The hardware has constraints on the hue area boundaries beyond the
78 	 * control min, max and step. The values must match one of the following
79 	 * expressions.
80 	 *
81 	 * 0L <= 0U <= 1L <= 1U <= 2L <= 2U <= 3L <= 3U <= 4L <= 4U <= 5L <= 5U
82 	 * 0U <= 1L <= 1U <= 2L <= 2U <= 3L <= 3U <= 4L <= 4U <= 5L <= 5U <= 0L
83 	 *
84 	 * Start by verifying the common part...
85 	 */
86 	for (i = 1; i < (HGT_NUM_HUE_AREAS * 2) - 1; ++i) {
87 		if (values[i] > values[i+1])
88 			return -EINVAL;
89 	}
90 
91 	/* ... and handle 0L separately. */
92 	if (values[0] > values[1] && values[11] > values[0])
93 		return -EINVAL;
94 
95 	return 0;
96 }
97 
98 static int hgt_hue_areas_s_ctrl(struct v4l2_ctrl *ctrl)
99 {
100 	struct vsp1_hgt *hgt = container_of(ctrl->handler, struct vsp1_hgt,
101 					    ctrls);
102 
103 	memcpy(hgt->hue_areas, ctrl->p_new.p_u8, sizeof(hgt->hue_areas));
104 	return 0;
105 }
106 
107 static const struct v4l2_ctrl_ops hgt_hue_areas_ctrl_ops = {
108 	.try_ctrl = hgt_hue_areas_try_ctrl,
109 	.s_ctrl = hgt_hue_areas_s_ctrl,
110 };
111 
112 static const struct v4l2_ctrl_config hgt_hue_areas = {
113 	.ops = &hgt_hue_areas_ctrl_ops,
114 	.id = V4L2_CID_VSP1_HGT_HUE_AREAS,
115 	.name = "Boundary Values for Hue Area",
116 	.type = V4L2_CTRL_TYPE_U8,
117 	.min = 0,
118 	.max = 255,
119 	.def = 0,
120 	.step = 1,
121 	.dims = { 12 },
122 };
123 
124 /* -----------------------------------------------------------------------------
125  * VSP1 Entity Operations
126  */
127 
128 static void hgt_configure_stream(struct vsp1_entity *entity,
129 				 struct vsp1_pipeline *pipe,
130 				 struct vsp1_dl_list *dl,
131 				 struct vsp1_dl_body *dlb)
132 {
133 	struct vsp1_hgt *hgt = to_hgt(&entity->subdev);
134 	struct v4l2_rect *compose;
135 	struct v4l2_rect *crop;
136 	unsigned int hratio;
137 	unsigned int vratio;
138 	u8 lower;
139 	u8 upper;
140 	unsigned int i;
141 
142 	crop = vsp1_entity_get_pad_selection(entity, entity->config,
143 					     HISTO_PAD_SINK, V4L2_SEL_TGT_CROP);
144 	compose = vsp1_entity_get_pad_selection(entity, entity->config,
145 						HISTO_PAD_SINK,
146 						V4L2_SEL_TGT_COMPOSE);
147 
148 	vsp1_hgt_write(hgt, dlb, VI6_HGT_REGRST, VI6_HGT_REGRST_RCLEA);
149 
150 	vsp1_hgt_write(hgt, dlb, VI6_HGT_OFFSET,
151 		       (crop->left << VI6_HGT_OFFSET_HOFFSET_SHIFT) |
152 		       (crop->top << VI6_HGT_OFFSET_VOFFSET_SHIFT));
153 	vsp1_hgt_write(hgt, dlb, VI6_HGT_SIZE,
154 		       (crop->width << VI6_HGT_SIZE_HSIZE_SHIFT) |
155 		       (crop->height << VI6_HGT_SIZE_VSIZE_SHIFT));
156 
157 	mutex_lock(hgt->ctrls.lock);
158 	for (i = 0; i < HGT_NUM_HUE_AREAS; ++i) {
159 		lower = hgt->hue_areas[i*2 + 0];
160 		upper = hgt->hue_areas[i*2 + 1];
161 		vsp1_hgt_write(hgt, dlb, VI6_HGT_HUE_AREA(i),
162 			       (lower << VI6_HGT_HUE_AREA_LOWER_SHIFT) |
163 			       (upper << VI6_HGT_HUE_AREA_UPPER_SHIFT));
164 	}
165 	mutex_unlock(hgt->ctrls.lock);
166 
167 	hratio = crop->width * 2 / compose->width / 3;
168 	vratio = crop->height * 2 / compose->height / 3;
169 	vsp1_hgt_write(hgt, dlb, VI6_HGT_MODE,
170 		       (hratio << VI6_HGT_MODE_HRATIO_SHIFT) |
171 		       (vratio << VI6_HGT_MODE_VRATIO_SHIFT));
172 }
173 
174 static const struct vsp1_entity_operations hgt_entity_ops = {
175 	.configure_stream = hgt_configure_stream,
176 	.destroy = vsp1_histogram_destroy,
177 };
178 
179 /* -----------------------------------------------------------------------------
180  * Initialization and Cleanup
181  */
182 
183 static const unsigned int hgt_mbus_formats[] = {
184 	MEDIA_BUS_FMT_AHSV8888_1X32,
185 };
186 
187 struct vsp1_hgt *vsp1_hgt_create(struct vsp1_device *vsp1)
188 {
189 	struct vsp1_hgt *hgt;
190 	int ret;
191 
192 	hgt = devm_kzalloc(vsp1->dev, sizeof(*hgt), GFP_KERNEL);
193 	if (hgt == NULL)
194 		return ERR_PTR(-ENOMEM);
195 
196 	/* Initialize the control handler. */
197 	v4l2_ctrl_handler_init(&hgt->ctrls, 1);
198 	v4l2_ctrl_new_custom(&hgt->ctrls, &hgt_hue_areas, NULL);
199 
200 	hgt->histo.entity.subdev.ctrl_handler = &hgt->ctrls;
201 
202 	/* Initialize the video device and queue for statistics data. */
203 	ret = vsp1_histogram_init(vsp1, &hgt->histo, VSP1_ENTITY_HGT, "hgt",
204 				  &hgt_entity_ops, hgt_mbus_formats,
205 				  ARRAY_SIZE(hgt_mbus_formats),
206 				  HGT_DATA_SIZE, V4L2_META_FMT_VSP1_HGT);
207 	if (ret < 0) {
208 		vsp1_entity_destroy(&hgt->histo.entity);
209 		return ERR_PTR(ret);
210 	}
211 
212 	v4l2_ctrl_handler_setup(&hgt->ctrls);
213 
214 	return hgt;
215 }
216