1/*
2 * vsp1_wpf.c  --  R-Car VSP1 Write Pixel Formatter
3 *
4 * Copyright (C) 2013-2014 Renesas Electronics Corporation
5 *
6 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14#include <linux/device.h>
15
16#include <media/v4l2-subdev.h>
17
18#include "vsp1.h"
19#include "vsp1_rwpf.h"
20#include "vsp1_video.h"
21
22#define WPF_MAX_WIDTH				2048
23#define WPF_MAX_HEIGHT				2048
24
25/* -----------------------------------------------------------------------------
26 * Device Access
27 */
28
29static inline u32 vsp1_wpf_read(struct vsp1_rwpf *wpf, u32 reg)
30{
31	return vsp1_read(wpf->entity.vsp1,
32			 reg + wpf->entity.index * VI6_WPF_OFFSET);
33}
34
35static inline void vsp1_wpf_write(struct vsp1_rwpf *wpf, u32 reg, u32 data)
36{
37	vsp1_write(wpf->entity.vsp1,
38		   reg + wpf->entity.index * VI6_WPF_OFFSET, data);
39}
40
41/* -----------------------------------------------------------------------------
42 * Controls
43 */
44
45static int wpf_s_ctrl(struct v4l2_ctrl *ctrl)
46{
47	struct vsp1_rwpf *wpf =
48		container_of(ctrl->handler, struct vsp1_rwpf, ctrls);
49	u32 value;
50
51	if (!vsp1_entity_is_streaming(&wpf->entity))
52		return 0;
53
54	switch (ctrl->id) {
55	case V4L2_CID_ALPHA_COMPONENT:
56		value = vsp1_wpf_read(wpf, VI6_WPF_OUTFMT);
57		value &= ~VI6_WPF_OUTFMT_PDV_MASK;
58		value |= ctrl->val << VI6_WPF_OUTFMT_PDV_SHIFT;
59		vsp1_wpf_write(wpf, VI6_WPF_OUTFMT, value);
60		break;
61	}
62
63	return 0;
64}
65
66static const struct v4l2_ctrl_ops wpf_ctrl_ops = {
67	.s_ctrl = wpf_s_ctrl,
68};
69
70/* -----------------------------------------------------------------------------
71 * V4L2 Subdevice Core Operations
72 */
73
74static int wpf_s_stream(struct v4l2_subdev *subdev, int enable)
75{
76	struct vsp1_pipeline *pipe = to_vsp1_pipeline(&subdev->entity);
77	struct vsp1_rwpf *wpf = to_rwpf(subdev);
78	struct vsp1_device *vsp1 = wpf->entity.vsp1;
79	const struct v4l2_rect *crop = &wpf->crop;
80	unsigned int i;
81	u32 srcrpf = 0;
82	u32 outfmt = 0;
83	int ret;
84
85	ret = vsp1_entity_set_streaming(&wpf->entity, enable);
86	if (ret < 0)
87		return ret;
88
89	if (!enable) {
90		vsp1_write(vsp1, VI6_WPF_IRQ_ENB(wpf->entity.index), 0);
91		vsp1_wpf_write(wpf, VI6_WPF_SRCRPF, 0);
92		return 0;
93	}
94
95	/* Sources. If the pipeline has a single input configure it as the
96	 * master layer. Otherwise configure all inputs as sub-layers and
97	 * select the virtual RPF as the master layer.
98	 */
99	for (i = 0; i < pipe->num_inputs; ++i) {
100		struct vsp1_rwpf *input = pipe->inputs[i];
101
102		srcrpf |= pipe->num_inputs == 1
103			? VI6_WPF_SRCRPF_RPF_ACT_MST(input->entity.index)
104			: VI6_WPF_SRCRPF_RPF_ACT_SUB(input->entity.index);
105	}
106
107	if (pipe->num_inputs > 1)
108		srcrpf |= VI6_WPF_SRCRPF_VIRACT_MST;
109
110	vsp1_wpf_write(wpf, VI6_WPF_SRCRPF, srcrpf);
111
112	/* Destination stride. */
113	if (!pipe->lif) {
114		struct v4l2_pix_format_mplane *format = &wpf->video.format;
115
116		vsp1_wpf_write(wpf, VI6_WPF_DSTM_STRIDE_Y,
117			       format->plane_fmt[0].bytesperline);
118		if (format->num_planes > 1)
119			vsp1_wpf_write(wpf, VI6_WPF_DSTM_STRIDE_C,
120				       format->plane_fmt[1].bytesperline);
121	}
122
123	vsp1_wpf_write(wpf, VI6_WPF_HSZCLIP, VI6_WPF_SZCLIP_EN |
124		       (crop->left << VI6_WPF_SZCLIP_OFST_SHIFT) |
125		       (crop->width << VI6_WPF_SZCLIP_SIZE_SHIFT));
126	vsp1_wpf_write(wpf, VI6_WPF_VSZCLIP, VI6_WPF_SZCLIP_EN |
127		       (crop->top << VI6_WPF_SZCLIP_OFST_SHIFT) |
128		       (crop->height << VI6_WPF_SZCLIP_SIZE_SHIFT));
129
130	/* Format */
131	if (!pipe->lif) {
132		const struct vsp1_format_info *fmtinfo = wpf->video.fmtinfo;
133
134		outfmt = fmtinfo->hwfmt << VI6_WPF_OUTFMT_WRFMT_SHIFT;
135
136		if (fmtinfo->alpha)
137			outfmt |= VI6_WPF_OUTFMT_PXA;
138		if (fmtinfo->swap_yc)
139			outfmt |= VI6_WPF_OUTFMT_SPYCS;
140		if (fmtinfo->swap_uv)
141			outfmt |= VI6_WPF_OUTFMT_SPUVS;
142
143		vsp1_wpf_write(wpf, VI6_WPF_DSWAP, fmtinfo->swap);
144	}
145
146	if (wpf->entity.formats[RWPF_PAD_SINK].code !=
147	    wpf->entity.formats[RWPF_PAD_SOURCE].code)
148		outfmt |= VI6_WPF_OUTFMT_CSC;
149
150	/* Take the control handler lock to ensure that the PDV value won't be
151	 * changed behind our back by a set control operation.
152	 */
153	mutex_lock(wpf->ctrls.lock);
154	outfmt |= vsp1_wpf_read(wpf, VI6_WPF_OUTFMT) & VI6_WPF_OUTFMT_PDV_MASK;
155	vsp1_wpf_write(wpf, VI6_WPF_OUTFMT, outfmt);
156	mutex_unlock(wpf->ctrls.lock);
157
158	vsp1_write(vsp1, VI6_DPR_WPF_FPORCH(wpf->entity.index),
159		   VI6_DPR_WPF_FPORCH_FP_WPFN);
160
161	vsp1_write(vsp1, VI6_WPF_WRBCK_CTRL, 0);
162
163	/* Enable interrupts */
164	vsp1_write(vsp1, VI6_WPF_IRQ_STA(wpf->entity.index), 0);
165	vsp1_write(vsp1, VI6_WPF_IRQ_ENB(wpf->entity.index),
166		   VI6_WFP_IRQ_ENB_FREE);
167
168	return 0;
169}
170
171/* -----------------------------------------------------------------------------
172 * V4L2 Subdevice Operations
173 */
174
175static struct v4l2_subdev_video_ops wpf_video_ops = {
176	.s_stream = wpf_s_stream,
177};
178
179static struct v4l2_subdev_pad_ops wpf_pad_ops = {
180	.enum_mbus_code = vsp1_rwpf_enum_mbus_code,
181	.enum_frame_size = vsp1_rwpf_enum_frame_size,
182	.get_fmt = vsp1_rwpf_get_format,
183	.set_fmt = vsp1_rwpf_set_format,
184	.get_selection = vsp1_rwpf_get_selection,
185	.set_selection = vsp1_rwpf_set_selection,
186};
187
188static struct v4l2_subdev_ops wpf_ops = {
189	.video	= &wpf_video_ops,
190	.pad    = &wpf_pad_ops,
191};
192
193/* -----------------------------------------------------------------------------
194 * Video Device Operations
195 */
196
197static void wpf_vdev_queue(struct vsp1_video *video,
198			   struct vsp1_video_buffer *buf)
199{
200	struct vsp1_rwpf *wpf = container_of(video, struct vsp1_rwpf, video);
201
202	vsp1_wpf_write(wpf, VI6_WPF_DSTM_ADDR_Y, buf->addr[0]);
203	if (buf->buf.num_planes > 1)
204		vsp1_wpf_write(wpf, VI6_WPF_DSTM_ADDR_C0, buf->addr[1]);
205	if (buf->buf.num_planes > 2)
206		vsp1_wpf_write(wpf, VI6_WPF_DSTM_ADDR_C1, buf->addr[2]);
207}
208
209static const struct vsp1_video_operations wpf_vdev_ops = {
210	.queue = wpf_vdev_queue,
211};
212
213/* -----------------------------------------------------------------------------
214 * Initialization and Cleanup
215 */
216
217struct vsp1_rwpf *vsp1_wpf_create(struct vsp1_device *vsp1, unsigned int index)
218{
219	struct v4l2_subdev *subdev;
220	struct vsp1_video *video;
221	struct vsp1_rwpf *wpf;
222	unsigned int flags;
223	int ret;
224
225	wpf = devm_kzalloc(vsp1->dev, sizeof(*wpf), GFP_KERNEL);
226	if (wpf == NULL)
227		return ERR_PTR(-ENOMEM);
228
229	wpf->max_width = WPF_MAX_WIDTH;
230	wpf->max_height = WPF_MAX_HEIGHT;
231
232	wpf->entity.type = VSP1_ENTITY_WPF;
233	wpf->entity.index = index;
234
235	ret = vsp1_entity_init(vsp1, &wpf->entity, 2);
236	if (ret < 0)
237		return ERR_PTR(ret);
238
239	/* Initialize the V4L2 subdev. */
240	subdev = &wpf->entity.subdev;
241	v4l2_subdev_init(subdev, &wpf_ops);
242
243	subdev->entity.ops = &vsp1_media_ops;
244	subdev->internal_ops = &vsp1_subdev_internal_ops;
245	snprintf(subdev->name, sizeof(subdev->name), "%s wpf.%u",
246		 dev_name(vsp1->dev), index);
247	v4l2_set_subdevdata(subdev, wpf);
248	subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
249
250	vsp1_entity_init_formats(subdev, NULL);
251
252	/* Initialize the control handler. */
253	v4l2_ctrl_handler_init(&wpf->ctrls, 1);
254	v4l2_ctrl_new_std(&wpf->ctrls, &wpf_ctrl_ops, V4L2_CID_ALPHA_COMPONENT,
255			  0, 255, 1, 255);
256
257	wpf->entity.subdev.ctrl_handler = &wpf->ctrls;
258
259	if (wpf->ctrls.error) {
260		dev_err(vsp1->dev, "wpf%u: failed to initialize controls\n",
261			index);
262		ret = wpf->ctrls.error;
263		goto error;
264	}
265
266	/* Initialize the video device. */
267	video = &wpf->video;
268
269	video->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
270	video->vsp1 = vsp1;
271	video->ops = &wpf_vdev_ops;
272
273	ret = vsp1_video_init(video, &wpf->entity);
274	if (ret < 0)
275		goto error;
276
277	wpf->entity.video = video;
278
279	/* Connect the video device to the WPF. All connections are immutable
280	 * except for the WPF0 source link if a LIF is present.
281	 */
282	flags = MEDIA_LNK_FL_ENABLED;
283	if (!(vsp1->pdata->features & VSP1_HAS_LIF) || index != 0)
284		flags |= MEDIA_LNK_FL_IMMUTABLE;
285
286	ret = media_entity_create_link(&wpf->entity.subdev.entity,
287				       RWPF_PAD_SOURCE,
288				       &wpf->video.video.entity, 0, flags);
289	if (ret < 0)
290		goto error;
291
292	wpf->entity.sink = &wpf->video.video.entity;
293
294	return wpf;
295
296error:
297	vsp1_entity_destroy(&wpf->entity);
298	return ERR_PTR(ret);
299}
300