vsp1_hgo.c

  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 v4l2_subdev_state *state,
134				 struct vsp1_pipeline *pipe,
135				 struct vsp1_dl_list *dl,
136				 struct vsp1_dl_body *dlb)
137{
138	struct vsp1_hgo *hgo = to_hgo(&entity->subdev);
139	struct v4l2_rect *compose;
140	struct v4l2_rect *crop;
141	unsigned int hratio;
142	unsigned int vratio;
143
144	crop = v4l2_subdev_state_get_crop(state, HISTO_PAD_SINK);
145	compose = v4l2_subdev_state_get_compose(state, HISTO_PAD_SINK);
146
147	vsp1_hgo_write(hgo, dlb, VI6_HGO_REGRST, VI6_HGO_REGRST_RCLEA);
148
149	vsp1_hgo_write(hgo, dlb, VI6_HGO_OFFSET,
150		       (crop->left << VI6_HGO_OFFSET_HOFFSET_SHIFT) |
151		       (crop->top << VI6_HGO_OFFSET_VOFFSET_SHIFT));
152	vsp1_hgo_write(hgo, dlb, VI6_HGO_SIZE,
153		       (crop->width << VI6_HGO_SIZE_HSIZE_SHIFT) |
154		       (crop->height << VI6_HGO_SIZE_VSIZE_SHIFT));
155
156	mutex_lock(hgo->ctrls.handler.lock);
157	hgo->max_rgb = hgo->ctrls.max_rgb->cur.val;
158	if (hgo->ctrls.num_bins)
159		hgo->num_bins = hgo_num_bins[hgo->ctrls.num_bins->cur.val];
160	mutex_unlock(hgo->ctrls.handler.lock);
161
162	hratio = crop->width * 2 / compose->width / 3;
163	vratio = crop->height * 2 / compose->height / 3;
164	vsp1_hgo_write(hgo, dlb, VI6_HGO_MODE,
165		       (hgo->num_bins == 256 ? VI6_HGO_MODE_STEP : 0) |
166		       (hgo->max_rgb ? VI6_HGO_MODE_MAXRGB : 0) |
167		       (hratio << VI6_HGO_MODE_HRATIO_SHIFT) |
168		       (vratio << VI6_HGO_MODE_VRATIO_SHIFT));
169}
170
171static const struct vsp1_entity_operations hgo_entity_ops = {
172	.configure_stream = hgo_configure_stream,
173	.destroy = vsp1_histogram_destroy,
174};
175
176/* -----------------------------------------------------------------------------
177 * Initialization and Cleanup
178 */
179
180static const unsigned int hgo_mbus_formats[] = {
181	MEDIA_BUS_FMT_AYUV8_1X32,
182	MEDIA_BUS_FMT_ARGB8888_1X32,
183	MEDIA_BUS_FMT_AHSV8888_1X32,
184};
185
186struct vsp1_hgo *vsp1_hgo_create(struct vsp1_device *vsp1)
187{
188	struct vsp1_hgo *hgo;
189	int ret;
190
191	hgo = devm_kzalloc(vsp1->dev, sizeof(*hgo), GFP_KERNEL);
192	if (hgo == NULL)
193		return ERR_PTR(-ENOMEM);
194
195	/* Initialize the video device and queue for statistics data. */
196	ret = vsp1_histogram_init(vsp1, &hgo->histo, VSP1_ENTITY_HGO, "hgo",
197				  &hgo_entity_ops, hgo_mbus_formats,
198				  ARRAY_SIZE(hgo_mbus_formats),
199				  HGO_DATA_SIZE, V4L2_META_FMT_VSP1_HGO);
200	if (ret < 0) {
201		vsp1_entity_destroy(&hgo->histo.entity);
202		return ERR_PTR(ret);
203	}
204
205	/* Initialize the control handler. */
206	v4l2_ctrl_handler_init(&hgo->ctrls.handler,
207			       vsp1->info->gen >= 3 ? 2 : 1);
208	hgo->ctrls.max_rgb = v4l2_ctrl_new_custom(&hgo->ctrls.handler,
209						  &hgo_max_rgb_control, NULL);
210	if (vsp1->info->gen >= 3)
211		hgo->ctrls.num_bins =
212			v4l2_ctrl_new_custom(&hgo->ctrls.handler,
213					     &hgo_num_bins_control, NULL);
214
215	hgo->max_rgb = false;
216	hgo->num_bins = 64;
217
218	hgo->histo.entity.subdev.ctrl_handler = &hgo->ctrls.handler;
219
220	return hgo;
221}