/*
 * vsp1_wpf.c  --  R-Car VSP1 Write Pixel Formatter
 *
 * Copyright (C) 2013-2014 Renesas Electronics Corporation
 *
 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/device.h>

#include <media/v4l2-subdev.h>

#include "vsp1.h"
#include "vsp1_dl.h"
#include "vsp1_pipe.h"
#include "vsp1_rwpf.h"
#include "vsp1_video.h"

#define WPF_GEN2_MAX_WIDTH			2048U
#define WPF_GEN2_MAX_HEIGHT			2048U
#define WPF_GEN3_MAX_WIDTH			8190U
#define WPF_GEN3_MAX_HEIGHT			8190U

/* -----------------------------------------------------------------------------
 * Device Access
 */

static inline void vsp1_wpf_write(struct vsp1_rwpf *wpf,
				  struct vsp1_dl_list *dl, u32 reg, u32 data)
{
	vsp1_dl_list_write(dl, reg + wpf->entity.index * VI6_WPF_OFFSET, data);
}

/* -----------------------------------------------------------------------------
 * V4L2 Subdevice Core Operations
 */

static int wpf_s_stream(struct v4l2_subdev *subdev, int enable)
{
	struct vsp1_rwpf *wpf = to_rwpf(subdev);
	struct vsp1_device *vsp1 = wpf->entity.vsp1;

	if (enable)
		return 0;

	/* Write to registers directly when stopping the stream as there will be
	 * no pipeline run to apply the display list.
	 */
	vsp1_write(vsp1, VI6_WPF_IRQ_ENB(wpf->entity.index), 0);
	vsp1_write(vsp1, wpf->entity.index * VI6_WPF_OFFSET +
		   VI6_WPF_SRCRPF, 0);

	return 0;
}

/* -----------------------------------------------------------------------------
 * V4L2 Subdevice Operations
 */

static struct v4l2_subdev_video_ops wpf_video_ops = {
	.s_stream = wpf_s_stream,
};

static struct v4l2_subdev_ops wpf_ops = {
	.video	= &wpf_video_ops,
	.pad    = &vsp1_rwpf_pad_ops,
};

/* -----------------------------------------------------------------------------
 * VSP1 Entity Operations
 */

static void vsp1_wpf_destroy(struct vsp1_entity *entity)
{
	struct vsp1_rwpf *wpf = entity_to_rwpf(entity);

	vsp1_dlm_destroy(wpf->dlm);
}

static void wpf_set_memory(struct vsp1_entity *entity, struct vsp1_dl_list *dl)
{
	struct vsp1_rwpf *wpf = entity_to_rwpf(entity);

	vsp1_wpf_write(wpf, dl, VI6_WPF_DSTM_ADDR_Y, wpf->mem.addr[0]);
	vsp1_wpf_write(wpf, dl, VI6_WPF_DSTM_ADDR_C0, wpf->mem.addr[1]);
	vsp1_wpf_write(wpf, dl, VI6_WPF_DSTM_ADDR_C1, wpf->mem.addr[2]);
}

static void wpf_configure(struct vsp1_entity *entity,
			  struct vsp1_pipeline *pipe,
			  struct vsp1_dl_list *dl)
{
	struct vsp1_rwpf *wpf = to_rwpf(&entity->subdev);
	struct vsp1_device *vsp1 = wpf->entity.vsp1;
	const struct v4l2_mbus_framefmt *source_format;
	const struct v4l2_mbus_framefmt *sink_format;
	const struct v4l2_rect *crop;
	unsigned int i;
	u32 outfmt = 0;
	u32 srcrpf = 0;

	/* Cropping */
	crop = vsp1_rwpf_get_crop(wpf, wpf->entity.config);

	vsp1_wpf_write(wpf, dl, VI6_WPF_HSZCLIP, VI6_WPF_SZCLIP_EN |
		       (crop->left << VI6_WPF_SZCLIP_OFST_SHIFT) |
		       (crop->width << VI6_WPF_SZCLIP_SIZE_SHIFT));
	vsp1_wpf_write(wpf, dl, VI6_WPF_VSZCLIP, VI6_WPF_SZCLIP_EN |
		       (crop->top << VI6_WPF_SZCLIP_OFST_SHIFT) |
		       (crop->height << VI6_WPF_SZCLIP_SIZE_SHIFT));

	/* Format */
	sink_format = vsp1_entity_get_pad_format(&wpf->entity,
						 wpf->entity.config,
						 RWPF_PAD_SINK);
	source_format = vsp1_entity_get_pad_format(&wpf->entity,
						   wpf->entity.config,
						   RWPF_PAD_SOURCE);

	if (!pipe->lif) {
		const struct v4l2_pix_format_mplane *format = &wpf->format;
		const struct vsp1_format_info *fmtinfo = wpf->fmtinfo;

		outfmt = fmtinfo->hwfmt << VI6_WPF_OUTFMT_WRFMT_SHIFT;

		if (fmtinfo->alpha)
			outfmt |= VI6_WPF_OUTFMT_PXA;
		if (fmtinfo->swap_yc)
			outfmt |= VI6_WPF_OUTFMT_SPYCS;
		if (fmtinfo->swap_uv)
			outfmt |= VI6_WPF_OUTFMT_SPUVS;

		/* Destination stride and byte swapping. */
		vsp1_wpf_write(wpf, dl, VI6_WPF_DSTM_STRIDE_Y,
			       format->plane_fmt[0].bytesperline);
		if (format->num_planes > 1)
			vsp1_wpf_write(wpf, dl, VI6_WPF_DSTM_STRIDE_C,
				       format->plane_fmt[1].bytesperline);

		vsp1_wpf_write(wpf, dl, VI6_WPF_DSWAP, fmtinfo->swap);
	}

	if (sink_format->code != source_format->code)
		outfmt |= VI6_WPF_OUTFMT_CSC;

	outfmt |= wpf->alpha << VI6_WPF_OUTFMT_PDV_SHIFT;
	vsp1_wpf_write(wpf, dl, VI6_WPF_OUTFMT, outfmt);

	vsp1_dl_list_write(dl, VI6_DPR_WPF_FPORCH(wpf->entity.index),
			   VI6_DPR_WPF_FPORCH_FP_WPFN);

	vsp1_dl_list_write(dl, VI6_WPF_WRBCK_CTRL, 0);

	/* Sources. If the pipeline has a single input and BRU is not used,
	 * configure it as the master layer. Otherwise configure all
	 * inputs as sub-layers and select the virtual RPF as the master
	 * layer.
	 */
	for (i = 0; i < vsp1->info->rpf_count; ++i) {
		struct vsp1_rwpf *input = pipe->inputs[i];

		if (!input)
			continue;

		srcrpf |= (!pipe->bru && pipe->num_inputs == 1)
			? VI6_WPF_SRCRPF_RPF_ACT_MST(input->entity.index)
			: VI6_WPF_SRCRPF_RPF_ACT_SUB(input->entity.index);
	}

	if (pipe->bru || pipe->num_inputs > 1)
		srcrpf |= VI6_WPF_SRCRPF_VIRACT_MST;

	vsp1_wpf_write(wpf, dl, VI6_WPF_SRCRPF, srcrpf);

	/* Enable interrupts */
	vsp1_dl_list_write(dl, VI6_WPF_IRQ_STA(wpf->entity.index), 0);
	vsp1_dl_list_write(dl, VI6_WPF_IRQ_ENB(wpf->entity.index),
			   VI6_WFP_IRQ_ENB_FREE);
}

static const struct vsp1_entity_operations wpf_entity_ops = {
	.destroy = vsp1_wpf_destroy,
	.set_memory = wpf_set_memory,
	.configure = wpf_configure,
};

/* -----------------------------------------------------------------------------
 * Initialization and Cleanup
 */

struct vsp1_rwpf *vsp1_wpf_create(struct vsp1_device *vsp1, unsigned int index)
{
	struct vsp1_rwpf *wpf;
	char name[6];
	int ret;

	wpf = devm_kzalloc(vsp1->dev, sizeof(*wpf), GFP_KERNEL);
	if (wpf == NULL)
		return ERR_PTR(-ENOMEM);

	if (vsp1->info->gen == 2) {
		wpf->max_width = WPF_GEN2_MAX_WIDTH;
		wpf->max_height = WPF_GEN2_MAX_HEIGHT;
	} else {
		wpf->max_width = WPF_GEN3_MAX_WIDTH;
		wpf->max_height = WPF_GEN3_MAX_HEIGHT;
	}

	wpf->entity.ops = &wpf_entity_ops;
	wpf->entity.type = VSP1_ENTITY_WPF;
	wpf->entity.index = index;

	sprintf(name, "wpf.%u", index);
	ret = vsp1_entity_init(vsp1, &wpf->entity, name, 2, &wpf_ops);
	if (ret < 0)
		return ERR_PTR(ret);

	/* Initialize the display list manager. */
	wpf->dlm = vsp1_dlm_create(vsp1, index, 4);
	if (!wpf->dlm) {
		ret = -ENOMEM;
		goto error;
	}

	/* Initialize the control handler. */
	ret = vsp1_rwpf_init_ctrls(wpf);
	if (ret < 0) {
		dev_err(vsp1->dev, "wpf%u: failed to initialize controls\n",
			index);
		goto error;
	}

	return wpf;

error:
	vsp1_entity_destroy(&wpf->entity);
	return ERR_PTR(ret);
}