1 /*
2 * vsp1_hgt.c -- R-Car VSP1 Histogram Generator 2D
3 *
4 * Copyright (C) 2016 Renesas Electronics Corporation
5 *
6 * Contact: Niklas Söderlund (niklas.soderlund@ragnatech.se)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14 #include <linux/device.h>
15 #include <linux/gfp.h>
16
17 #include <media/v4l2-subdev.h>
18 #include <media/videobuf2-vmalloc.h>
19
20 #include "vsp1.h"
21 #include "vsp1_dl.h"
22 #include "vsp1_hgt.h"
23
24 #define HGT_DATA_SIZE ((2 + 6 * 32) * 4)
25
26 /* -----------------------------------------------------------------------------
27 * Device Access
28 */
29
vsp1_hgt_read(struct vsp1_hgt * hgt,u32 reg)30 static inline u32 vsp1_hgt_read(struct vsp1_hgt *hgt, u32 reg)
31 {
32 return vsp1_read(hgt->histo.entity.vsp1, reg);
33 }
34
vsp1_hgt_write(struct vsp1_hgt * hgt,struct vsp1_dl_list * dl,u32 reg,u32 data)35 static inline void vsp1_hgt_write(struct vsp1_hgt *hgt, struct vsp1_dl_list *dl,
36 u32 reg, u32 data)
37 {
38 vsp1_dl_list_write(dl, reg, data);
39 }
40
41 /* -----------------------------------------------------------------------------
42 * Frame End Handler
43 */
44
vsp1_hgt_frame_end(struct vsp1_entity * entity)45 void vsp1_hgt_frame_end(struct vsp1_entity *entity)
46 {
47 struct vsp1_hgt *hgt = to_hgt(&entity->subdev);
48 struct vsp1_histogram_buffer *buf;
49 unsigned int m;
50 unsigned int n;
51 u32 *data;
52
53 buf = vsp1_histogram_buffer_get(&hgt->histo);
54 if (!buf)
55 return;
56
57 data = buf->addr;
58
59 *data++ = vsp1_hgt_read(hgt, VI6_HGT_MAXMIN);
60 *data++ = vsp1_hgt_read(hgt, VI6_HGT_SUM);
61
62 for (m = 0; m < 6; ++m)
63 for (n = 0; n < 32; ++n)
64 *data++ = vsp1_hgt_read(hgt, VI6_HGT_HISTO(m, n));
65
66 vsp1_histogram_buffer_complete(&hgt->histo, buf, HGT_DATA_SIZE);
67 }
68
69 /* -----------------------------------------------------------------------------
70 * Controls
71 */
72
73 #define V4L2_CID_VSP1_HGT_HUE_AREAS (V4L2_CID_USER_BASE | 0x1001)
74
hgt_hue_areas_try_ctrl(struct v4l2_ctrl * ctrl)75 static int hgt_hue_areas_try_ctrl(struct v4l2_ctrl *ctrl)
76 {
77 const u8 *values = ctrl->p_new.p_u8;
78 unsigned int i;
79
80 /*
81 * The hardware has constraints on the hue area boundaries beyond the
82 * control min, max and step. The values must match one of the following
83 * expressions.
84 *
85 * 0L <= 0U <= 1L <= 1U <= 2L <= 2U <= 3L <= 3U <= 4L <= 4U <= 5L <= 5U
86 * 0U <= 1L <= 1U <= 2L <= 2U <= 3L <= 3U <= 4L <= 4U <= 5L <= 5U <= 0L
87 *
88 * Start by verifying the common part...
89 */
90 for (i = 1; i < (HGT_NUM_HUE_AREAS * 2) - 1; ++i) {
91 if (values[i] > values[i+1])
92 return -EINVAL;
93 }
94
95 /* ... and handle 0L separately. */
96 if (values[0] > values[1] && values[11] > values[0])
97 return -EINVAL;
98
99 return 0;
100 }
101
hgt_hue_areas_s_ctrl(struct v4l2_ctrl * ctrl)102 static int hgt_hue_areas_s_ctrl(struct v4l2_ctrl *ctrl)
103 {
104 struct vsp1_hgt *hgt = container_of(ctrl->handler, struct vsp1_hgt,
105 ctrls);
106
107 memcpy(hgt->hue_areas, ctrl->p_new.p_u8, sizeof(hgt->hue_areas));
108 return 0;
109 }
110
111 static const struct v4l2_ctrl_ops hgt_hue_areas_ctrl_ops = {
112 .try_ctrl = hgt_hue_areas_try_ctrl,
113 .s_ctrl = hgt_hue_areas_s_ctrl,
114 };
115
116 static const struct v4l2_ctrl_config hgt_hue_areas = {
117 .ops = &hgt_hue_areas_ctrl_ops,
118 .id = V4L2_CID_VSP1_HGT_HUE_AREAS,
119 .name = "Boundary Values for Hue Area",
120 .type = V4L2_CTRL_TYPE_U8,
121 .min = 0,
122 .max = 255,
123 .def = 0,
124 .step = 1,
125 .dims = { 12 },
126 };
127
128 /* -----------------------------------------------------------------------------
129 * VSP1 Entity Operations
130 */
131
hgt_configure(struct vsp1_entity * entity,struct vsp1_pipeline * pipe,struct vsp1_dl_list * dl,enum vsp1_entity_params params)132 static void hgt_configure(struct vsp1_entity *entity,
133 struct vsp1_pipeline *pipe,
134 struct vsp1_dl_list *dl,
135 enum vsp1_entity_params params)
136 {
137 struct vsp1_hgt *hgt = to_hgt(&entity->subdev);
138 struct v4l2_rect *compose;
139 struct v4l2_rect *crop;
140 unsigned int hratio;
141 unsigned int vratio;
142 u8 lower;
143 u8 upper;
144 unsigned int i;
145
146 if (params != VSP1_ENTITY_PARAMS_INIT)
147 return;
148
149 crop = vsp1_entity_get_pad_selection(entity, entity->config,
150 HISTO_PAD_SINK, V4L2_SEL_TGT_CROP);
151 compose = vsp1_entity_get_pad_selection(entity, entity->config,
152 HISTO_PAD_SINK,
153 V4L2_SEL_TGT_COMPOSE);
154
155 vsp1_hgt_write(hgt, dl, VI6_HGT_REGRST, VI6_HGT_REGRST_RCLEA);
156
157 vsp1_hgt_write(hgt, dl, VI6_HGT_OFFSET,
158 (crop->left << VI6_HGT_OFFSET_HOFFSET_SHIFT) |
159 (crop->top << VI6_HGT_OFFSET_VOFFSET_SHIFT));
160 vsp1_hgt_write(hgt, dl, VI6_HGT_SIZE,
161 (crop->width << VI6_HGT_SIZE_HSIZE_SHIFT) |
162 (crop->height << VI6_HGT_SIZE_VSIZE_SHIFT));
163
164 mutex_lock(hgt->ctrls.lock);
165 for (i = 0; i < HGT_NUM_HUE_AREAS; ++i) {
166 lower = hgt->hue_areas[i*2 + 0];
167 upper = hgt->hue_areas[i*2 + 1];
168 vsp1_hgt_write(hgt, dl, VI6_HGT_HUE_AREA(i),
169 (lower << VI6_HGT_HUE_AREA_LOWER_SHIFT) |
170 (upper << VI6_HGT_HUE_AREA_UPPER_SHIFT));
171 }
172 mutex_unlock(hgt->ctrls.lock);
173
174 hratio = crop->width * 2 / compose->width / 3;
175 vratio = crop->height * 2 / compose->height / 3;
176 vsp1_hgt_write(hgt, dl, VI6_HGT_MODE,
177 (hratio << VI6_HGT_MODE_HRATIO_SHIFT) |
178 (vratio << VI6_HGT_MODE_VRATIO_SHIFT));
179 }
180
181 static const struct vsp1_entity_operations hgt_entity_ops = {
182 .configure = hgt_configure,
183 .destroy = vsp1_histogram_destroy,
184 };
185
186 /* -----------------------------------------------------------------------------
187 * Initialization and Cleanup
188 */
189
190 static const unsigned int hgt_mbus_formats[] = {
191 MEDIA_BUS_FMT_AHSV8888_1X32,
192 };
193
vsp1_hgt_create(struct vsp1_device * vsp1)194 struct vsp1_hgt *vsp1_hgt_create(struct vsp1_device *vsp1)
195 {
196 struct vsp1_hgt *hgt;
197 int ret;
198
199 hgt = devm_kzalloc(vsp1->dev, sizeof(*hgt), GFP_KERNEL);
200 if (hgt == NULL)
201 return ERR_PTR(-ENOMEM);
202
203 /* Initialize the control handler. */
204 v4l2_ctrl_handler_init(&hgt->ctrls, 1);
205 v4l2_ctrl_new_custom(&hgt->ctrls, &hgt_hue_areas, NULL);
206
207 hgt->histo.entity.subdev.ctrl_handler = &hgt->ctrls;
208
209 /* Initialize the video device and queue for statistics data. */
210 ret = vsp1_histogram_init(vsp1, &hgt->histo, VSP1_ENTITY_HGT, "hgt",
211 &hgt_entity_ops, hgt_mbus_formats,
212 ARRAY_SIZE(hgt_mbus_formats),
213 HGT_DATA_SIZE, V4L2_META_FMT_VSP1_HGT);
214 if (ret < 0) {
215 vsp1_entity_destroy(&hgt->histo.entity);
216 return ERR_PTR(ret);
217 }
218
219 v4l2_ctrl_handler_setup(&hgt->ctrls);
220
221 return hgt;
222 }
223