linux/drivers/media/platform/sunxi/sun4i-csi/sun4i_dma.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2016 NextThing Co
 * Copyright (C) 2016-2019 Bootlin
 *
 * Author: Maxime Ripard <[email protected]>
 */

#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <media/videobuf2-dma-contig.h>
#include <media/videobuf2-v4l2.h>

#include "sun4i_csi.h"

struct sun4i_csi_buffer { … };

static inline struct sun4i_csi_buffer *
vb2_v4l2_to_csi_buffer(const struct vb2_v4l2_buffer *p)
{ … }

static inline struct sun4i_csi_buffer *
vb2_to_csi_buffer(const struct vb2_buffer *p)
{ … }

static void sun4i_csi_capture_start(struct sun4i_csi *csi)
{ … }

static void sun4i_csi_capture_stop(struct sun4i_csi *csi)
{ … }

static int sun4i_csi_queue_setup(struct vb2_queue *vq,
				 unsigned int *nbuffers,
				 unsigned int *nplanes,
				 unsigned int sizes[],
				 struct device *alloc_devs[])
{
	struct sun4i_csi *csi = vb2_get_drv_priv(vq);
	unsigned int num_planes = csi->fmt.num_planes;
	unsigned int i;

	if (*nplanes) {
		if (*nplanes != num_planes)
			return -EINVAL;

		for (i = 0; i < num_planes; i++)
			if (sizes[i] < csi->fmt.plane_fmt[i].sizeimage)
				return -EINVAL;
		return 0;
	}

	*nplanes = num_planes;
	for (i = 0; i < num_planes; i++)
		sizes[i] = csi->fmt.plane_fmt[i].sizeimage;

	return 0;
};

static int sun4i_csi_buffer_prepare(struct vb2_buffer *vb)
{ … }

static int sun4i_csi_setup_scratch_buffer(struct sun4i_csi *csi,
					  unsigned int slot)
{ … }

static int sun4i_csi_buffer_fill_slot(struct sun4i_csi *csi, unsigned int slot)
{ … }

static int sun4i_csi_buffer_fill_all(struct sun4i_csi *csi)
{ … }

static void sun4i_csi_buffer_mark_done(struct sun4i_csi *csi,
				       unsigned int slot,
				       unsigned int sequence)
{ … }

static int sun4i_csi_buffer_flip(struct sun4i_csi *csi, unsigned int sequence)
{ … }

static void sun4i_csi_buffer_queue(struct vb2_buffer *vb)
{ … }

static void return_all_buffers(struct sun4i_csi *csi,
			       enum vb2_buffer_state state)
{ … }

static int sun4i_csi_start_streaming(struct vb2_queue *vq, unsigned int count)
{ … }

static void sun4i_csi_stop_streaming(struct vb2_queue *vq)
{ … }

static const struct vb2_ops sun4i_csi_qops = …;

static irqreturn_t sun4i_csi_irq(int irq, void *data)
{ … }

int sun4i_csi_dma_register(struct sun4i_csi *csi, int irq)
{ … }

void sun4i_csi_dma_unregister(struct sun4i_csi *csi)
{ … }