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 
vsp1_lut_write(struct vsp1_lut * lut,struct vsp1_dl_body * dlb,u32 reg,u32 data)28 static 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 
lut_set_table(struct vsp1_lut * lut,struct v4l2_ctrl * ctrl)40 static 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 
lut_s_ctrl(struct v4l2_ctrl * ctrl)61 static 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 
75 static const struct v4l2_ctrl_ops lut_ctrl_ops = {
76 	.s_ctrl = lut_s_ctrl,
77 };
78 
79 static 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 
95 static 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 
lut_enum_mbus_code(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_mbus_code_enum * code)101 static 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 
lut_enum_frame_size(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_frame_size_enum * fse)109 static 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 
lut_set_format(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * fmt)119 static 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 
133 static const struct v4l2_subdev_pad_ops lut_pad_ops = {
134 	.init_cfg = vsp1_entity_init_cfg,
135 	.enum_mbus_code = lut_enum_mbus_code,
136 	.enum_frame_size = lut_enum_frame_size,
137 	.get_fmt = vsp1_subdev_get_pad_format,
138 	.set_fmt = lut_set_format,
139 };
140 
141 static const struct v4l2_subdev_ops lut_ops = {
142 	.pad    = &lut_pad_ops,
143 };
144 
145 /* -----------------------------------------------------------------------------
146  * VSP1 Entity Operations
147  */
148 
lut_configure_stream(struct vsp1_entity * entity,struct vsp1_pipeline * pipe,struct vsp1_dl_list * dl,struct vsp1_dl_body * dlb)149 static void lut_configure_stream(struct vsp1_entity *entity,
150 				 struct vsp1_pipeline *pipe,
151 				 struct vsp1_dl_list *dl,
152 				 struct vsp1_dl_body *dlb)
153 {
154 	struct vsp1_lut *lut = to_lut(&entity->subdev);
155 
156 	vsp1_lut_write(lut, dlb, VI6_LUT_CTRL, VI6_LUT_CTRL_EN);
157 }
158 
lut_configure_frame(struct vsp1_entity * entity,struct vsp1_pipeline * pipe,struct vsp1_dl_list * dl,struct vsp1_dl_body * dlb)159 static void lut_configure_frame(struct vsp1_entity *entity,
160 				struct vsp1_pipeline *pipe,
161 				struct vsp1_dl_list *dl,
162 				struct vsp1_dl_body *dlb)
163 {
164 	struct vsp1_lut *lut = to_lut(&entity->subdev);
165 	struct vsp1_dl_body *lut_dlb;
166 	unsigned long flags;
167 
168 	spin_lock_irqsave(&lut->lock, flags);
169 	lut_dlb = lut->lut;
170 	lut->lut = NULL;
171 	spin_unlock_irqrestore(&lut->lock, flags);
172 
173 	if (lut_dlb) {
174 		vsp1_dl_list_add_body(dl, lut_dlb);
175 
176 		/* Release our local reference. */
177 		vsp1_dl_body_put(lut_dlb);
178 	}
179 }
180 
lut_destroy(struct vsp1_entity * entity)181 static void lut_destroy(struct vsp1_entity *entity)
182 {
183 	struct vsp1_lut *lut = to_lut(&entity->subdev);
184 
185 	vsp1_dl_body_pool_destroy(lut->pool);
186 }
187 
188 static const struct vsp1_entity_operations lut_entity_ops = {
189 	.configure_stream = lut_configure_stream,
190 	.configure_frame = lut_configure_frame,
191 	.destroy = lut_destroy,
192 };
193 
194 /* -----------------------------------------------------------------------------
195  * Initialization and Cleanup
196  */
197 
vsp1_lut_create(struct vsp1_device * vsp1)198 struct vsp1_lut *vsp1_lut_create(struct vsp1_device *vsp1)
199 {
200 	struct vsp1_lut *lut;
201 	int ret;
202 
203 	lut = devm_kzalloc(vsp1->dev, sizeof(*lut), GFP_KERNEL);
204 	if (lut == NULL)
205 		return ERR_PTR(-ENOMEM);
206 
207 	spin_lock_init(&lut->lock);
208 
209 	lut->entity.ops = &lut_entity_ops;
210 	lut->entity.type = VSP1_ENTITY_LUT;
211 
212 	ret = vsp1_entity_init(vsp1, &lut->entity, "lut", 2, &lut_ops,
213 			       MEDIA_ENT_F_PROC_VIDEO_LUT);
214 	if (ret < 0)
215 		return ERR_PTR(ret);
216 
217 	/*
218 	 * Pre-allocate a body pool, with 3 bodies allowing a userspace update
219 	 * before the hardware has committed a previous set of tables, handling
220 	 * both the queued and pending dl entries.
221 	 */
222 	lut->pool = vsp1_dl_body_pool_create(vsp1, 3, LUT_SIZE, 0);
223 	if (!lut->pool)
224 		return ERR_PTR(-ENOMEM);
225 
226 	/* Initialize the control handler. */
227 	v4l2_ctrl_handler_init(&lut->ctrls, 1);
228 	v4l2_ctrl_new_custom(&lut->ctrls, &lut_table_control, NULL);
229 
230 	lut->entity.subdev.ctrl_handler = &lut->ctrls;
231 
232 	if (lut->ctrls.error) {
233 		dev_err(vsp1->dev, "lut: failed to initialize controls\n");
234 		ret = lut->ctrls.error;
235 		vsp1_entity_destroy(&lut->entity);
236 		return ERR_PTR(ret);
237 	}
238 
239 	v4l2_ctrl_handler_setup(&lut->ctrls);
240 
241 	return lut;
242 }
243