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 and BRU is not used,
96	 * configure it as the master layer. Otherwise configure all
97	 * inputs as sub-layers and select the virtual RPF as the master
98	 * layer.
99	 */
100	for (i = 0; i < pipe->num_inputs; ++i) {
101		struct vsp1_rwpf *input = pipe->inputs[i];
102
103		srcrpf |= (!pipe->bru && pipe->num_inputs == 1)
104			? VI6_WPF_SRCRPF_RPF_ACT_MST(input->entity.index)
105			: VI6_WPF_SRCRPF_RPF_ACT_SUB(input->entity.index);
106	}
107
108	if (pipe->bru || pipe->num_inputs > 1)
109		srcrpf |= VI6_WPF_SRCRPF_VIRACT_MST;
110
111	vsp1_wpf_write(wpf, VI6_WPF_SRCRPF, srcrpf);
112
113	/* Destination stride. */
114	if (!pipe->lif) {
115		struct v4l2_pix_format_mplane *format = &wpf->video.format;
116
117		vsp1_wpf_write(wpf, VI6_WPF_DSTM_STRIDE_Y,
118			       format->plane_fmt[0].bytesperline);
119		if (format->num_planes > 1)
120			vsp1_wpf_write(wpf, VI6_WPF_DSTM_STRIDE_C,
121				       format->plane_fmt[1].bytesperline);
122	}
123
124	vsp1_wpf_write(wpf, VI6_WPF_HSZCLIP, VI6_WPF_SZCLIP_EN |
125		       (crop->left << VI6_WPF_SZCLIP_OFST_SHIFT) |
126		       (crop->width << VI6_WPF_SZCLIP_SIZE_SHIFT));
127	vsp1_wpf_write(wpf, VI6_WPF_VSZCLIP, VI6_WPF_SZCLIP_EN |
128		       (crop->top << VI6_WPF_SZCLIP_OFST_SHIFT) |
129		       (crop->height << VI6_WPF_SZCLIP_SIZE_SHIFT));
130
131	/* Format */
132	if (!pipe->lif) {
133		const struct vsp1_format_info *fmtinfo = wpf->video.fmtinfo;
134
135		outfmt = fmtinfo->hwfmt << VI6_WPF_OUTFMT_WRFMT_SHIFT;
136
137		if (fmtinfo->alpha)
138			outfmt |= VI6_WPF_OUTFMT_PXA;
139		if (fmtinfo->swap_yc)
140			outfmt |= VI6_WPF_OUTFMT_SPYCS;
141		if (fmtinfo->swap_uv)
142			outfmt |= VI6_WPF_OUTFMT_SPUVS;
143
144		vsp1_wpf_write(wpf, VI6_WPF_DSWAP, fmtinfo->swap);
145	}
146
147	if (wpf->entity.formats[RWPF_PAD_SINK].code !=
148	    wpf->entity.formats[RWPF_PAD_SOURCE].code)
149		outfmt |= VI6_WPF_OUTFMT_CSC;
150
151	/* Take the control handler lock to ensure that the PDV value won't be
152	 * changed behind our back by a set control operation.
153	 */
154	mutex_lock(wpf->ctrls.lock);
155	outfmt |= vsp1_wpf_read(wpf, VI6_WPF_OUTFMT) & VI6_WPF_OUTFMT_PDV_MASK;
156	vsp1_wpf_write(wpf, VI6_WPF_OUTFMT, outfmt);
157	mutex_unlock(wpf->ctrls.lock);
158
159	vsp1_write(vsp1, VI6_DPR_WPF_FPORCH(wpf->entity.index),
160		   VI6_DPR_WPF_FPORCH_FP_WPFN);
161
162	vsp1_write(vsp1, VI6_WPF_WRBCK_CTRL, 0);
163
164	/* Enable interrupts */
165	vsp1_write(vsp1, VI6_WPF_IRQ_STA(wpf->entity.index), 0);
166	vsp1_write(vsp1, VI6_WPF_IRQ_ENB(wpf->entity.index),
167		   VI6_WFP_IRQ_ENB_FREE);
168
169	return 0;
170}
171
172/* -----------------------------------------------------------------------------
173 * V4L2 Subdevice Operations
174 */
175
176static struct v4l2_subdev_video_ops wpf_video_ops = {
177	.s_stream = wpf_s_stream,
178};
179
180static struct v4l2_subdev_pad_ops wpf_pad_ops = {
181	.enum_mbus_code = vsp1_rwpf_enum_mbus_code,
182	.enum_frame_size = vsp1_rwpf_enum_frame_size,
183	.get_fmt = vsp1_rwpf_get_format,
184	.set_fmt = vsp1_rwpf_set_format,
185	.get_selection = vsp1_rwpf_get_selection,
186	.set_selection = vsp1_rwpf_set_selection,
187};
188
189static struct v4l2_subdev_ops wpf_ops = {
190	.video	= &wpf_video_ops,
191	.pad    = &wpf_pad_ops,
192};
193
194/* -----------------------------------------------------------------------------
195 * Video Device Operations
196 */
197
198static void wpf_vdev_queue(struct vsp1_video *video,
199			   struct vsp1_video_buffer *buf)
200{
201	struct vsp1_rwpf *wpf = container_of(video, struct vsp1_rwpf, video);
202
203	vsp1_wpf_write(wpf, VI6_WPF_DSTM_ADDR_Y, buf->addr[0]);
204	if (buf->buf.num_planes > 1)
205		vsp1_wpf_write(wpf, VI6_WPF_DSTM_ADDR_C0, buf->addr[1]);
206	if (buf->buf.num_planes > 2)
207		vsp1_wpf_write(wpf, VI6_WPF_DSTM_ADDR_C1, buf->addr[2]);
208}
209
210static const struct vsp1_video_operations wpf_vdev_ops = {
211	.queue = wpf_vdev_queue,
212};
213
214/* -----------------------------------------------------------------------------
215 * Initialization and Cleanup
216 */
217
218struct vsp1_rwpf *vsp1_wpf_create(struct vsp1_device *vsp1, unsigned int index)
219{
220	struct v4l2_subdev *subdev;
221	struct vsp1_video *video;
222	struct vsp1_rwpf *wpf;
223	unsigned int flags;
224	int ret;
225
226	wpf = devm_kzalloc(vsp1->dev, sizeof(*wpf), GFP_KERNEL);
227	if (wpf == NULL)
228		return ERR_PTR(-ENOMEM);
229
230	wpf->max_width = WPF_MAX_WIDTH;
231	wpf->max_height = WPF_MAX_HEIGHT;
232
233	wpf->entity.type = VSP1_ENTITY_WPF;
234	wpf->entity.index = index;
235
236	ret = vsp1_entity_init(vsp1, &wpf->entity, 2);
237	if (ret < 0)
238		return ERR_PTR(ret);
239
240	/* Initialize the V4L2 subdev. */
241	subdev = &wpf->entity.subdev;
242	v4l2_subdev_init(subdev, &wpf_ops);
243
244	subdev->entity.ops = &vsp1_media_ops;
245	subdev->internal_ops = &vsp1_subdev_internal_ops;
246	snprintf(subdev->name, sizeof(subdev->name), "%s wpf.%u",
247		 dev_name(vsp1->dev), index);
248	v4l2_set_subdevdata(subdev, wpf);
249	subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
250
251	vsp1_entity_init_formats(subdev, NULL);
252
253	/* Initialize the control handler. */
254	v4l2_ctrl_handler_init(&wpf->ctrls, 1);
255	v4l2_ctrl_new_std(&wpf->ctrls, &wpf_ctrl_ops, V4L2_CID_ALPHA_COMPONENT,
256			  0, 255, 1, 255);
257
258	wpf->entity.subdev.ctrl_handler = &wpf->ctrls;
259
260	if (wpf->ctrls.error) {
261		dev_err(vsp1->dev, "wpf%u: failed to initialize controls\n",
262			index);
263		ret = wpf->ctrls.error;
264		goto error;
265	}
266
267	/* Initialize the video device. */
268	video = &wpf->video;
269
270	video->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
271	video->vsp1 = vsp1;
272	video->ops = &wpf_vdev_ops;
273
274	ret = vsp1_video_init(video, &wpf->entity);
275	if (ret < 0)
276		goto error;
277
278	wpf->entity.video = video;
279
280	/* Connect the video device to the WPF. All connections are immutable
281	 * except for the WPF0 source link if a LIF is present.
282	 */
283	flags = MEDIA_LNK_FL_ENABLED;
284	if (!(vsp1->pdata.features & VSP1_HAS_LIF) || index != 0)
285		flags |= MEDIA_LNK_FL_IMMUTABLE;
286
287	ret = media_entity_create_link(&wpf->entity.subdev.entity,
288				       RWPF_PAD_SOURCE,
289				       &wpf->video.video.entity, 0, flags);
290	if (ret < 0)
291		goto error;
292
293	wpf->entity.sink = &wpf->video.video.entity;
294
295	return wpf;
296
297error:
298	vsp1_entity_destroy(&wpf->entity);
299	return ERR_PTR(ret);
300}
301