1 /*
2  * Copyright (C) 2017 Fuzhou Rockchip Electronics Co.Ltd
3  * Author: Jacob Chen <jacob-chen@iotwrt.com>
4  *
5  * This software is licensed under the terms of the GNU General Public
6  * License version 2, as published by the Free Software Foundation, and
7  * may be copied, distributed, and modified under those terms.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  */
14 
15 #include <linux/pm_runtime.h>
16 
17 #include <media/v4l2-device.h>
18 #include <media/v4l2-ioctl.h>
19 #include <media/v4l2-mem2mem.h>
20 #include <media/videobuf2-dma-sg.h>
21 #include <media/videobuf2-v4l2.h>
22 
23 #include "rga-hw.h"
24 #include "rga.h"
25 
26 static int
27 rga_queue_setup(struct vb2_queue *vq,
28 		unsigned int *nbuffers, unsigned int *nplanes,
29 		unsigned int sizes[], struct device *alloc_devs[])
30 {
31 	struct rga_ctx *ctx = vb2_get_drv_priv(vq);
32 	struct rga_frame *f = rga_get_frame(ctx, vq->type);
33 
34 	if (IS_ERR(f))
35 		return PTR_ERR(f);
36 
37 	if (*nplanes)
38 		return sizes[0] < f->size ? -EINVAL : 0;
39 
40 	sizes[0] = f->size;
41 	*nplanes = 1;
42 
43 	return 0;
44 }
45 
46 static int rga_buf_prepare(struct vb2_buffer *vb)
47 {
48 	struct rga_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
49 	struct rga_frame *f = rga_get_frame(ctx, vb->vb2_queue->type);
50 
51 	if (IS_ERR(f))
52 		return PTR_ERR(f);
53 
54 	vb2_set_plane_payload(vb, 0, f->size);
55 
56 	return 0;
57 }
58 
59 static void rga_buf_queue(struct vb2_buffer *vb)
60 {
61 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
62 	struct rga_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
63 
64 	v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
65 }
66 
67 static int rga_buf_start_streaming(struct vb2_queue *q, unsigned int count)
68 {
69 	struct rga_ctx *ctx = vb2_get_drv_priv(q);
70 	struct rockchip_rga *rga = ctx->rga;
71 	int ret, i;
72 
73 	ret = pm_runtime_get_sync(rga->dev);
74 
75 	if (!ret)
76 		return 0;
77 
78 	for (i = 0; i < q->num_buffers; ++i) {
79 		if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE) {
80 			v4l2_m2m_buf_done(to_vb2_v4l2_buffer(q->bufs[i]),
81 					  VB2_BUF_STATE_QUEUED);
82 		}
83 	}
84 
85 	return ret;
86 }
87 
88 static void rga_buf_stop_streaming(struct vb2_queue *q)
89 {
90 	struct rga_ctx *ctx = vb2_get_drv_priv(q);
91 	struct rockchip_rga *rga = ctx->rga;
92 	struct vb2_v4l2_buffer *vbuf;
93 
94 	for (;;) {
95 		if (V4L2_TYPE_IS_OUTPUT(q->type))
96 			vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
97 		else
98 			vbuf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
99 		if (!vbuf)
100 			break;
101 		v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
102 	}
103 
104 	pm_runtime_put(rga->dev);
105 }
106 
107 const struct vb2_ops rga_qops = {
108 	.queue_setup = rga_queue_setup,
109 	.buf_prepare = rga_buf_prepare,
110 	.buf_queue = rga_buf_queue,
111 	.wait_prepare = vb2_ops_wait_prepare,
112 	.wait_finish = vb2_ops_wait_finish,
113 	.start_streaming = rga_buf_start_streaming,
114 	.stop_streaming = rga_buf_stop_streaming,
115 };
116 
117 /* RGA MMU is a 1-Level MMU, so it can't be used through the IOMMU API.
118  * We use it more like a scatter-gather list.
119  */
120 void rga_buf_map(struct vb2_buffer *vb)
121 {
122 	struct rga_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
123 	struct rockchip_rga *rga = ctx->rga;
124 	struct sg_table *sgt;
125 	struct scatterlist *sgl;
126 	unsigned int *pages;
127 	unsigned int address, len, i, p;
128 	unsigned int mapped_size = 0;
129 
130 	if (vb->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
131 		pages = rga->src_mmu_pages;
132 	else
133 		pages = rga->dst_mmu_pages;
134 
135 	/* Create local MMU table for RGA */
136 	sgt = vb2_plane_cookie(vb, 0);
137 
138 	for_each_sg(sgt->sgl, sgl, sgt->nents, i) {
139 		len = sg_dma_len(sgl) >> PAGE_SHIFT;
140 		address = sg_phys(sgl);
141 
142 		for (p = 0; p < len; p++) {
143 			dma_addr_t phys = address + (p << PAGE_SHIFT);
144 
145 			pages[mapped_size + p] = phys;
146 		}
147 
148 		mapped_size += len;
149 	}
150 
151 	/* sync local MMU table for RGA */
152 	dma_sync_single_for_device(rga->dev, virt_to_phys(pages),
153 				   8 * PAGE_SIZE, DMA_BIDIRECTIONAL);
154 }
155