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
26static inline u32 vsp1_hgt_read(struct vsp1_hgt *hgt, u32 reg)
27{
28	return vsp1_read(hgt->histo.entity.vsp1, reg);
29}
30
31static 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
41void 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
71static 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
98static 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
107static 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
112static 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
128static 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
174static 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
183static const unsigned int hgt_mbus_formats[] = {
184	MEDIA_BUS_FMT_AHSV8888_1X32,
185};
186
187struct 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