drivers/media/platform/rockchip/rga/rga-buf.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2017 Fuzhou Rockchip Electronics Co.Ltd
   4  * Author: Jacob Chen <jacob-chen@iotwrt.com>
   5  */
   6
   7 #include <linux/pm_runtime.h>
   8
   9 #include <media/v4l2-device.h>
  10 #include <media/v4l2-ioctl.h>
  11 #include <media/v4l2-mem2mem.h>
  12 #include <media/videobuf2-dma-sg.h>
  13 #include <media/videobuf2-v4l2.h>
  14
  15 #include "rga-hw.h"
  16 #include "rga.h"
  17
  18 static int
  19 rga_queue_setup(struct vb2_queue *vq,
  20                 unsigned int *nbuffers, unsigned int *nplanes,
  21                 unsigned int sizes[], struct device *alloc_devs[])
  22 {
  23         struct rga_ctx *ctx = vb2_get_drv_priv(vq);
  24         struct rga_frame *f = rga_get_frame(ctx, vq->type);
  25
  26         if (IS_ERR(f))
  27                 return PTR_ERR(f);
  28
  29         if (*nplanes)
  30                 return sizes[0] < f->size ? -EINVAL : 0;
  31
  32         sizes[0] = f->size;
  33         *nplanes = 1;
  34
  35         return 0;
  36 }
  37
  38 static int rga_buf_prepare(struct vb2_buffer *vb)
  39 {
  40         struct rga_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
  41         struct rga_frame *f = rga_get_frame(ctx, vb->vb2_queue->type);
  42
  43         if (IS_ERR(f))
  44                 return PTR_ERR(f);
  45
  46         vb2_set_plane_payload(vb, 0, f->size);
  47
  48         return 0;
  49 }
  50
  51 static void rga_buf_queue(struct vb2_buffer *vb)
  52 {
  53         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  54         struct rga_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
  55
  56         v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
  57 }
  58
  59 static void rga_buf_return_buffers(struct vb2_queue *q,
  60                                    enum vb2_buffer_state state)
  61 {
  62         struct rga_ctx *ctx = vb2_get_drv_priv(q);
  63         struct vb2_v4l2_buffer *vbuf;
  64
  65         for (;;) {
  66                 if (V4L2_TYPE_IS_OUTPUT(q->type))
  67                         vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
  68                 else
  69                         vbuf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
  70                 if (!vbuf)
  71                         break;
  72                 v4l2_m2m_buf_done(vbuf, state);
  73         }
  74 }
  75
  76 static int rga_buf_start_streaming(struct vb2_queue *q, unsigned int count)
  77 {
  78         struct rga_ctx *ctx = vb2_get_drv_priv(q);
  79         struct rockchip_rga *rga = ctx->rga;
  80         int ret;
  81
  82         ret = pm_runtime_get_sync(rga->dev);
  83         if (ret < 0) {
  84                 rga_buf_return_buffers(q, VB2_BUF_STATE_QUEUED);
  85                 return ret;
  86         }
  87
  88         return 0;
  89 }
  90
  91 static void rga_buf_stop_streaming(struct vb2_queue *q)
  92 {
  93         struct rga_ctx *ctx = vb2_get_drv_priv(q);
  94         struct rockchip_rga *rga = ctx->rga;
  95
  96         rga_buf_return_buffers(q, VB2_BUF_STATE_ERROR);
  97         pm_runtime_put(rga->dev);
  98 }
  99
 100 const struct vb2_ops rga_qops = {
 101         .queue_setup = rga_queue_setup,
 102         .buf_prepare = rga_buf_prepare,
 103         .buf_queue = rga_buf_queue,
 104         .wait_prepare = vb2_ops_wait_prepare,
 105         .wait_finish = vb2_ops_wait_finish,
 106         .start_streaming = rga_buf_start_streaming,
 107         .stop_streaming = rga_buf_stop_streaming,
 108 };
 109
 110 /* RGA MMU is a 1-Level MMU, so it can't be used through the IOMMU API.
 111  * We use it more like a scatter-gather list.
 112  */
 113 void rga_buf_map(struct vb2_buffer *vb)
 114 {
 115         struct rga_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
 116         struct rockchip_rga *rga = ctx->rga;
 117         struct sg_table *sgt;
 118         struct scatterlist *sgl;
 119         unsigned int *pages;
 120         unsigned int address, len, i, p;
 121         unsigned int mapped_size = 0;
 122
 123         if (vb->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
 124                 pages = rga->src_mmu_pages;
 125         else
 126                 pages = rga->dst_mmu_pages;
 127
 128         /* Create local MMU table for RGA */
 129         sgt = vb2_plane_cookie(vb, 0);
 130
 131         for_each_sg(sgt->sgl, sgl, sgt->nents, i) {
 132                 len = sg_dma_len(sgl) >> PAGE_SHIFT;
 133                 address = sg_phys(sgl);
 134
 135                 for (p = 0; p < len; p++) {
 136                         dma_addr_t phys = address +
 137                                           ((dma_addr_t)p << PAGE_SHIFT);
 138
 139                         pages[mapped_size + p] = phys;
 140                 }
 141
 142                 mapped_size += len;
 143         }
 144
 145         /* sync local MMU table for RGA */
 146         dma_sync_single_for_device(rga->dev, virt_to_phys(pages),
 147                                    8 * PAGE_SIZE, DMA_BIDIRECTIONAL);
 148 }