1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * vsp1_hgo.c  --  R-Car VSP1 Histogram Generator 1D
4 *
5 * Copyright (C) 2016 Renesas Electronics Corporation
6 *
7 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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_hgo.h"
19
20#define HGO_DATA_SIZE				((2 + 256) * 4)
21
22/* -----------------------------------------------------------------------------
23 * Device Access
24 */
25
26static inline u32 vsp1_hgo_read(struct vsp1_hgo *hgo, u32 reg)
27{
28	return vsp1_read(hgo->histo.entity.vsp1, reg);
29}
30
31static inline void vsp1_hgo_write(struct vsp1_hgo *hgo,
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_hgo_frame_end(struct vsp1_entity *entity)
42{
43	struct vsp1_hgo *hgo = to_hgo(&entity->subdev);
44	struct vsp1_histogram_buffer *buf;
45	unsigned int i;
46	size_t size;
47	u32 *data;
48
49	buf = vsp1_histogram_buffer_get(&hgo->histo);
50	if (!buf)
51		return;
52
53	data = buf->addr;
54
55	if (hgo->num_bins == 256) {
56		*data++ = vsp1_hgo_read(hgo, VI6_HGO_G_MAXMIN);
57		*data++ = vsp1_hgo_read(hgo, VI6_HGO_G_SUM);
58
59		for (i = 0; i < 256; ++i) {
60			vsp1_write(hgo->histo.entity.vsp1,
61				   VI6_HGO_EXT_HIST_ADDR, i);
62			*data++ = vsp1_hgo_read(hgo, VI6_HGO_EXT_HIST_DATA);
63		}
64
65		size = (2 + 256) * sizeof(u32);
66	} else if (hgo->max_rgb) {
67		*data++ = vsp1_hgo_read(hgo, VI6_HGO_G_MAXMIN);
68		*data++ = vsp1_hgo_read(hgo, VI6_HGO_G_SUM);
69
70		for (i = 0; i < 64; ++i)
71			*data++ = vsp1_hgo_read(hgo, VI6_HGO_G_HISTO(i));
72
73		size = (2 + 64) * sizeof(u32);
74	} else {
75		*data++ = vsp1_hgo_read(hgo, VI6_HGO_R_MAXMIN);
76		*data++ = vsp1_hgo_read(hgo, VI6_HGO_G_MAXMIN);
77		*data++ = vsp1_hgo_read(hgo, VI6_HGO_B_MAXMIN);
78
79		*data++ = vsp1_hgo_read(hgo, VI6_HGO_R_SUM);
80		*data++ = vsp1_hgo_read(hgo, VI6_HGO_G_SUM);
81		*data++ = vsp1_hgo_read(hgo, VI6_HGO_B_SUM);
82
83		for (i = 0; i < 64; ++i) {
84			data[i] = vsp1_hgo_read(hgo, VI6_HGO_R_HISTO(i));
85			data[i+64] = vsp1_hgo_read(hgo, VI6_HGO_G_HISTO(i));
86			data[i+128] = vsp1_hgo_read(hgo, VI6_HGO_B_HISTO(i));
87		}
88
89		size = (6 + 64 * 3) * sizeof(u32);
90	}
91
92	vsp1_histogram_buffer_complete(&hgo->histo, buf, size);
93}
94
95/* -----------------------------------------------------------------------------
96 * Controls
97 */
98
99#define V4L2_CID_VSP1_HGO_MAX_RGB		(V4L2_CID_USER_BASE | 0x1001)
100#define V4L2_CID_VSP1_HGO_NUM_BINS		(V4L2_CID_USER_BASE | 0x1002)
101
102static const struct v4l2_ctrl_config hgo_max_rgb_control = {
103	.id = V4L2_CID_VSP1_HGO_MAX_RGB,
104	.name = "Maximum RGB Mode",
105	.type = V4L2_CTRL_TYPE_BOOLEAN,
106	.min = 0,
107	.max = 1,
108	.def = 0,
109	.step = 1,
110	.flags = V4L2_CTRL_FLAG_MODIFY_LAYOUT,
111};
112
113static const s64 hgo_num_bins[] = {
114	64, 256,
115};
116
117static const struct v4l2_ctrl_config hgo_num_bins_control = {
118	.id = V4L2_CID_VSP1_HGO_NUM_BINS,
119	.name = "Number of Bins",
120	.type = V4L2_CTRL_TYPE_INTEGER_MENU,
121	.min = 0,
122	.max = 1,
123	.def = 0,
124	.qmenu_int = hgo_num_bins,
125	.flags = V4L2_CTRL_FLAG_MODIFY_LAYOUT,
126};
127
128/* -----------------------------------------------------------------------------
129 * VSP1 Entity Operations
130 */
131
132static void hgo_configure_stream(struct vsp1_entity *entity,
133				 struct vsp1_pipeline *pipe,
134				 struct vsp1_dl_list *dl,
135				 struct vsp1_dl_body *dlb)
136{
137	struct vsp1_hgo *hgo = to_hgo(&entity->subdev);
138	struct v4l2_rect *compose;
139	struct v4l2_rect *crop;
140	unsigned int hratio;
141	unsigned int vratio;
142
143	crop = vsp1_entity_get_pad_selection(entity, entity->state,
144					     HISTO_PAD_SINK, V4L2_SEL_TGT_CROP);
145	compose = vsp1_entity_get_pad_selection(entity, entity->state,
146						HISTO_PAD_SINK,
147						V4L2_SEL_TGT_COMPOSE);
148
149	vsp1_hgo_write(hgo, dlb, VI6_HGO_REGRST, VI6_HGO_REGRST_RCLEA);
150
151	vsp1_hgo_write(hgo, dlb, VI6_HGO_OFFSET,
152		       (crop->left << VI6_HGO_OFFSET_HOFFSET_SHIFT) |
153		       (crop->top << VI6_HGO_OFFSET_VOFFSET_SHIFT));
154	vsp1_hgo_write(hgo, dlb, VI6_HGO_SIZE,
155		       (crop->width << VI6_HGO_SIZE_HSIZE_SHIFT) |
156		       (crop->height << VI6_HGO_SIZE_VSIZE_SHIFT));
157
158	mutex_lock(hgo->ctrls.handler.lock);
159	hgo->max_rgb = hgo->ctrls.max_rgb->cur.val;
160	if (hgo->ctrls.num_bins)
161		hgo->num_bins = hgo_num_bins[hgo->ctrls.num_bins->cur.val];
162	mutex_unlock(hgo->ctrls.handler.lock);
163
164	hratio = crop->width * 2 / compose->width / 3;
165	vratio = crop->height * 2 / compose->height / 3;
166	vsp1_hgo_write(hgo, dlb, VI6_HGO_MODE,
167		       (hgo->num_bins == 256 ? VI6_HGO_MODE_STEP : 0) |
168		       (hgo->max_rgb ? VI6_HGO_MODE_MAXRGB : 0) |
169		       (hratio << VI6_HGO_MODE_HRATIO_SHIFT) |
170		       (vratio << VI6_HGO_MODE_VRATIO_SHIFT));
171}
172
173static const struct vsp1_entity_operations hgo_entity_ops = {
174	.configure_stream = hgo_configure_stream,
175	.destroy = vsp1_histogram_destroy,
176};
177
178/* -----------------------------------------------------------------------------
179 * Initialization and Cleanup
180 */
181
182static const unsigned int hgo_mbus_formats[] = {
183	MEDIA_BUS_FMT_AYUV8_1X32,
184	MEDIA_BUS_FMT_ARGB8888_1X32,
185	MEDIA_BUS_FMT_AHSV8888_1X32,
186};
187
188struct vsp1_hgo *vsp1_hgo_create(struct vsp1_device *vsp1)
189{
190	struct vsp1_hgo *hgo;
191	int ret;
192
193	hgo = devm_kzalloc(vsp1->dev, sizeof(*hgo), GFP_KERNEL);
194	if (hgo == NULL)
195		return ERR_PTR(-ENOMEM);
196
197	/* Initialize the control handler. */
198	v4l2_ctrl_handler_init(&hgo->ctrls.handler,
199			       vsp1->info->gen >= 3 ? 2 : 1);
200	hgo->ctrls.max_rgb = v4l2_ctrl_new_custom(&hgo->ctrls.handler,
201						  &hgo_max_rgb_control, NULL);
202	if (vsp1->info->gen >= 3)
203		hgo->ctrls.num_bins =
204			v4l2_ctrl_new_custom(&hgo->ctrls.handler,
205					     &hgo_num_bins_control, NULL);
206
207	hgo->max_rgb = false;
208	hgo->num_bins = 64;
209
210	hgo->histo.entity.subdev.ctrl_handler = &hgo->ctrls.handler;
211
212	/* Initialize the video device and queue for statistics data. */
213	ret = vsp1_histogram_init(vsp1, &hgo->histo, VSP1_ENTITY_HGO, "hgo",
214				  &hgo_entity_ops, hgo_mbus_formats,
215				  ARRAY_SIZE(hgo_mbus_formats),
216				  HGO_DATA_SIZE, V4L2_META_FMT_VSP1_HGO);
217	if (ret < 0) {
218		vsp1_entity_destroy(&hgo->histo.entity);
219		return ERR_PTR(ret);
220	}
221
222	return hgo;
223}
224