summaryrefslogtreecommitdiffstats
path: root/drivers/media/platform/rockchip/rga/rga-buf.c
blob: 356821c2dacf024d06fbf23f9c86573ad78b5d84 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
/*
 * Copyright (C) 2017 Fuzhou Rockchip Electronics Co.Ltd
 * Author: Jacob Chen <jacob-chen@iotwrt.com>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/pm_runtime.h>

#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mem2mem.h>
#include <media/videobuf2-dma-sg.h>
#include <media/videobuf2-v4l2.h>

#include "rga-hw.h"
#include "rga.h"

static int
rga_queue_setup(struct vb2_queue *vq,
		unsigned int *nbuffers, unsigned int *nplanes,
		unsigned int sizes[], struct device *alloc_devs[])
{
	struct rga_ctx *ctx = vb2_get_drv_priv(vq);
	struct rga_frame *f = rga_get_frame(ctx, vq->type);

	if (IS_ERR(f))
		return PTR_ERR(f);

	if (*nplanes)
		return sizes[0] < f->size ? -EINVAL : 0;

	sizes[0] = f->size;
	*nplanes = 1;

	return 0;
}

static int rga_buf_prepare(struct vb2_buffer *vb)
{
	struct rga_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
	struct rga_frame *f = rga_get_frame(ctx, vb->vb2_queue->type);

	if (IS_ERR(f))
		return PTR_ERR(f);

	vb2_set_plane_payload(vb, 0, f->size);

	return 0;
}

static void rga_buf_queue(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct rga_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);

	v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
}

static void rga_buf_return_buffers(struct vb2_queue *q,
				   enum vb2_buffer_state state)
{
	struct rga_ctx *ctx = vb2_get_drv_priv(q);
	struct vb2_v4l2_buffer *vbuf;

	for (;;) {
		if (V4L2_TYPE_IS_OUTPUT(q->type))
			vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
		else
			vbuf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
		if (!vbuf)
			break;
		v4l2_m2m_buf_done(vbuf, state);
	}
}

static int rga_buf_start_streaming(struct vb2_queue *q, unsigned int count)
{
	struct rga_ctx *ctx = vb2_get_drv_priv(q);
	struct rockchip_rga *rga = ctx->rga;
	int ret;

	ret = pm_runtime_get_sync(rga->dev);
	if (ret < 0) {
		rga_buf_return_buffers(q, VB2_BUF_STATE_QUEUED);
		return ret;
	}

	return 0;
}

static void rga_buf_stop_streaming(struct vb2_queue *q)
{
	struct rga_ctx *ctx = vb2_get_drv_priv(q);
	struct rockchip_rga *rga = ctx->rga;

	rga_buf_return_buffers(q, VB2_BUF_STATE_ERROR);
	pm_runtime_put(rga->dev);
}

const struct vb2_ops rga_qops = {
	.queue_setup = rga_queue_setup,
	.buf_prepare = rga_buf_prepare,
	.buf_queue = rga_buf_queue,
	.wait_prepare = vb2_ops_wait_prepare,
	.wait_finish = vb2_ops_wait_finish,
	.start_streaming = rga_buf_start_streaming,
	.stop_streaming = rga_buf_stop_streaming,
};

/* RGA MMU is a 1-Level MMU, so it can't be used through the IOMMU API.
 * We use it more like a scatter-gather list.
 */
void rga_buf_map(struct vb2_buffer *vb)
{
	struct rga_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
	struct rockchip_rga *rga = ctx->rga;
	struct sg_table *sgt;
	struct scatterlist *sgl;
	unsigned int *pages;
	unsigned int address, len, i, p;
	unsigned int mapped_size = 0;

	if (vb->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
		pages = rga->src_mmu_pages;
	else
		pages = rga->dst_mmu_pages;

	/* Create local MMU table for RGA */
	sgt = vb2_plane_cookie(vb, 0);

	for_each_sg(sgt->sgl, sgl, sgt->nents, i) {
		len = sg_dma_len(sgl) >> PAGE_SHIFT;
		address = sg_phys(sgl);

		for (p = 0; p < len; p++) {
			dma_addr_t phys = address +
					  ((dma_addr_t)p << PAGE_SHIFT);

			pages[mapped_size + p] = phys;
		}

		mapped_size += len;
	}

	/* sync local MMU table for RGA */
	dma_sync_single_for_device(rga->dev, virt_to_phys(pages),
				   8 * PAGE_SIZE, DMA_BIDIRECTIONAL);
}