1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * vsp1_lut.c  --  R-Car VSP1 Look-Up Table
4 *
5 * Copyright (C) 2013 Renesas 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
15#include "vsp1.h"
16#include "vsp1_dl.h"
17#include "vsp1_lut.h"
18
19#define LUT_MIN_SIZE				4U
20#define LUT_MAX_SIZE				8190U
21
22#define LUT_SIZE				256
23
24/* -----------------------------------------------------------------------------
25 * Device Access
26 */
27
28static inline void vsp1_lut_write(struct vsp1_lut *lut,
29				  struct vsp1_dl_body *dlb, u32 reg, u32 data)
30{
31	vsp1_dl_body_write(dlb, reg, data);
32}
33
34/* -----------------------------------------------------------------------------
35 * Controls
36 */
37
38#define V4L2_CID_VSP1_LUT_TABLE			(V4L2_CID_USER_BASE | 0x1001)
39
40static int lut_set_table(struct vsp1_lut *lut, struct v4l2_ctrl *ctrl)
41{
42	struct vsp1_dl_body *dlb;
43	unsigned int i;
44
45	dlb = vsp1_dl_body_get(lut->pool);
46	if (!dlb)
47		return -ENOMEM;
48
49	for (i = 0; i < LUT_SIZE; ++i)
50		vsp1_dl_body_write(dlb, VI6_LUT_TABLE + 4 * i,
51				       ctrl->p_new.p_u32[i]);
52
53	spin_lock_irq(&lut->lock);
54	swap(lut->lut, dlb);
55	spin_unlock_irq(&lut->lock);
56
57	vsp1_dl_body_put(dlb);
58	return 0;
59}
60
61static int lut_s_ctrl(struct v4l2_ctrl *ctrl)
62{
63	struct vsp1_lut *lut =
64		container_of(ctrl->handler, struct vsp1_lut, ctrls);
65
66	switch (ctrl->id) {
67	case V4L2_CID_VSP1_LUT_TABLE:
68		lut_set_table(lut, ctrl);
69		break;
70	}
71
72	return 0;
73}
74
75static const struct v4l2_ctrl_ops lut_ctrl_ops = {
76	.s_ctrl = lut_s_ctrl,
77};
78
79static const struct v4l2_ctrl_config lut_table_control = {
80	.ops = &lut_ctrl_ops,
81	.id = V4L2_CID_VSP1_LUT_TABLE,
82	.name = "Look-Up Table",
83	.type = V4L2_CTRL_TYPE_U32,
84	.min = 0x00000000,
85	.max = 0x00ffffff,
86	.step = 1,
87	.def = 0,
88	.dims = { LUT_SIZE },
89};
90
91/* -----------------------------------------------------------------------------
92 * V4L2 Subdevice Pad Operations
93 */
94
95static const unsigned int lut_codes[] = {
96	MEDIA_BUS_FMT_ARGB8888_1X32,
97	MEDIA_BUS_FMT_AHSV8888_1X32,
98	MEDIA_BUS_FMT_AYUV8_1X32,
99};
100
101static int lut_enum_mbus_code(struct v4l2_subdev *subdev,
102			      struct v4l2_subdev_state *sd_state,
103			      struct v4l2_subdev_mbus_code_enum *code)
104{
105	return vsp1_subdev_enum_mbus_code(subdev, sd_state, code, lut_codes,
106					  ARRAY_SIZE(lut_codes));
107}
108
109static int lut_enum_frame_size(struct v4l2_subdev *subdev,
110			       struct v4l2_subdev_state *sd_state,
111			       struct v4l2_subdev_frame_size_enum *fse)
112{
113	return vsp1_subdev_enum_frame_size(subdev, sd_state, fse,
114					   LUT_MIN_SIZE,
115					   LUT_MIN_SIZE, LUT_MAX_SIZE,
116					   LUT_MAX_SIZE);
117}
118
119static int lut_set_format(struct v4l2_subdev *subdev,
120			  struct v4l2_subdev_state *sd_state,
121			  struct v4l2_subdev_format *fmt)
122{
123	return vsp1_subdev_set_pad_format(subdev, sd_state, fmt, lut_codes,
124					  ARRAY_SIZE(lut_codes),
125					  LUT_MIN_SIZE, LUT_MIN_SIZE,
126					  LUT_MAX_SIZE, LUT_MAX_SIZE);
127}
128
129/* -----------------------------------------------------------------------------
130 * V4L2 Subdevice Operations
131 */
132
133static const struct v4l2_subdev_pad_ops lut_pad_ops = {
134	.enum_mbus_code = lut_enum_mbus_code,
135	.enum_frame_size = lut_enum_frame_size,
136	.get_fmt = vsp1_subdev_get_pad_format,
137	.set_fmt = lut_set_format,
138};
139
140static const struct v4l2_subdev_ops lut_ops = {
141	.pad    = &lut_pad_ops,
142};
143
144/* -----------------------------------------------------------------------------
145 * VSP1 Entity Operations
146 */
147
148static void lut_configure_stream(struct vsp1_entity *entity,
149				 struct vsp1_pipeline *pipe,
150				 struct vsp1_dl_list *dl,
151				 struct vsp1_dl_body *dlb)
152{
153	struct vsp1_lut *lut = to_lut(&entity->subdev);
154
155	vsp1_lut_write(lut, dlb, VI6_LUT_CTRL, VI6_LUT_CTRL_EN);
156}
157
158static void lut_configure_frame(struct vsp1_entity *entity,
159				struct vsp1_pipeline *pipe,
160				struct vsp1_dl_list *dl,
161				struct vsp1_dl_body *dlb)
162{
163	struct vsp1_lut *lut = to_lut(&entity->subdev);
164	struct vsp1_dl_body *lut_dlb;
165	unsigned long flags;
166
167	spin_lock_irqsave(&lut->lock, flags);
168	lut_dlb = lut->lut;
169	lut->lut = NULL;
170	spin_unlock_irqrestore(&lut->lock, flags);
171
172	if (lut_dlb) {
173		vsp1_dl_list_add_body(dl, lut_dlb);
174
175		/* Release our local reference. */
176		vsp1_dl_body_put(lut_dlb);
177	}
178}
179
180static void lut_destroy(struct vsp1_entity *entity)
181{
182	struct vsp1_lut *lut = to_lut(&entity->subdev);
183
184	vsp1_dl_body_pool_destroy(lut->pool);
185}
186
187static const struct vsp1_entity_operations lut_entity_ops = {
188	.configure_stream = lut_configure_stream,
189	.configure_frame = lut_configure_frame,
190	.destroy = lut_destroy,
191};
192
193/* -----------------------------------------------------------------------------
194 * Initialization and Cleanup
195 */
196
197struct vsp1_lut *vsp1_lut_create(struct vsp1_device *vsp1)
198{
199	struct vsp1_lut *lut;
200	int ret;
201
202	lut = devm_kzalloc(vsp1->dev, sizeof(*lut), GFP_KERNEL);
203	if (lut == NULL)
204		return ERR_PTR(-ENOMEM);
205
206	spin_lock_init(&lut->lock);
207
208	lut->entity.ops = &lut_entity_ops;
209	lut->entity.type = VSP1_ENTITY_LUT;
210
211	ret = vsp1_entity_init(vsp1, &lut->entity, "lut", 2, &lut_ops,
212			       MEDIA_ENT_F_PROC_VIDEO_LUT);
213	if (ret < 0)
214		return ERR_PTR(ret);
215
216	/*
217	 * Pre-allocate a body pool, with 3 bodies allowing a userspace update
218	 * before the hardware has committed a previous set of tables, handling
219	 * both the queued and pending dl entries.
220	 */
221	lut->pool = vsp1_dl_body_pool_create(vsp1, 3, LUT_SIZE, 0);
222	if (!lut->pool)
223		return ERR_PTR(-ENOMEM);
224
225	/* Initialize the control handler. */
226	v4l2_ctrl_handler_init(&lut->ctrls, 1);
227	v4l2_ctrl_new_custom(&lut->ctrls, &lut_table_control, NULL);
228
229	lut->entity.subdev.ctrl_handler = &lut->ctrls;
230
231	if (lut->ctrls.error) {
232		dev_err(vsp1->dev, "lut: failed to initialize controls\n");
233		ret = lut->ctrls.error;
234		vsp1_entity_destroy(&lut->entity);
235		return ERR_PTR(ret);
236	}
237
238	v4l2_ctrl_handler_setup(&lut->ctrls);
239
240	return lut;
241}
242