/* exynos_drm_crtc.c
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 * Authors:
 *	Inki Dae <inki.dae@samsung.com>
 *	Joonyoung Shim <jy0922.shim@samsung.com>
 *	Seung-Woo Kim <sw0312.kim@samsung.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 <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>

#include "exynos_drm_crtc.h"
#include "exynos_drm_drv.h"
#include "exynos_drm_encoder.h"
#include "exynos_drm_plane.h"

static void exynos_drm_crtc_enable(struct drm_crtc *crtc)
{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

	if (exynos_crtc->enabled)
		return;

	if (exynos_crtc->ops->enable)
		exynos_crtc->ops->enable(exynos_crtc);

	exynos_crtc->enabled = true;

	drm_crtc_vblank_on(crtc);
}

static void exynos_drm_crtc_disable(struct drm_crtc *crtc)
{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

	if (!exynos_crtc->enabled)
		return;

	/* wait for the completion of page flip. */
	if (!wait_event_timeout(exynos_crtc->pending_flip_queue,
				(exynos_crtc->event == NULL), HZ/20))
		exynos_crtc->event = NULL;

	drm_crtc_vblank_off(crtc);

	if (exynos_crtc->ops->disable)
		exynos_crtc->ops->disable(exynos_crtc);

	exynos_crtc->enabled = false;
}

static bool
exynos_drm_crtc_mode_fixup(struct drm_crtc *crtc,
			    const struct drm_display_mode *mode,
			    struct drm_display_mode *adjusted_mode)
{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

	if (exynos_crtc->ops->mode_fixup)
		return exynos_crtc->ops->mode_fixup(exynos_crtc, mode,
						    adjusted_mode);

	return true;
}

static void
exynos_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

	if (exynos_crtc->ops->commit)
		exynos_crtc->ops->commit(exynos_crtc);
}

static void exynos_crtc_atomic_begin(struct drm_crtc *crtc,
				     struct drm_crtc_state *old_crtc_state)
{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

	if (crtc->state->event) {
		WARN_ON(drm_crtc_vblank_get(crtc) != 0);
		exynos_crtc->event = crtc->state->event;
	}
}

static void exynos_crtc_atomic_flush(struct drm_crtc *crtc,
				     struct drm_crtc_state *old_crtc_state)
{
}

static struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
	.enable		= exynos_drm_crtc_enable,
	.disable	= exynos_drm_crtc_disable,
	.mode_fixup	= exynos_drm_crtc_mode_fixup,
	.mode_set_nofb	= exynos_drm_crtc_mode_set_nofb,
	.atomic_begin	= exynos_crtc_atomic_begin,
	.atomic_flush	= exynos_crtc_atomic_flush,
};

static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
	struct exynos_drm_private *private = crtc->dev->dev_private;

	private->crtc[exynos_crtc->pipe] = NULL;

	drm_crtc_cleanup(crtc);
	kfree(exynos_crtc);
}

static struct drm_crtc_funcs exynos_crtc_funcs = {
	.set_config	= drm_atomic_helper_set_config,
	.page_flip	= drm_atomic_helper_page_flip,
	.destroy	= exynos_drm_crtc_destroy,
	.reset = drm_atomic_helper_crtc_reset,
	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
};

struct exynos_drm_crtc *exynos_drm_crtc_create(struct drm_device *drm_dev,
					struct drm_plane *plane,
					int pipe,
					enum exynos_drm_output_type type,
					const struct exynos_drm_crtc_ops *ops,
					void *ctx)
{
	struct exynos_drm_crtc *exynos_crtc;
	struct exynos_drm_private *private = drm_dev->dev_private;
	struct drm_crtc *crtc;
	int ret;

	exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
	if (!exynos_crtc)
		return ERR_PTR(-ENOMEM);

	init_waitqueue_head(&exynos_crtc->pending_flip_queue);

	exynos_crtc->pipe = pipe;
	exynos_crtc->type = type;
	exynos_crtc->ops = ops;
	exynos_crtc->ctx = ctx;

	crtc = &exynos_crtc->base;

	private->crtc[pipe] = crtc;

	ret = drm_crtc_init_with_planes(drm_dev, crtc, plane, NULL,
					&exynos_crtc_funcs);
	if (ret < 0)
		goto err_crtc;

	drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);

	return exynos_crtc;

err_crtc:
	plane->funcs->destroy(plane);
	kfree(exynos_crtc);
	return ERR_PTR(ret);
}

int exynos_drm_crtc_enable_vblank(struct drm_device *dev, int pipe)
{
	struct exynos_drm_private *private = dev->dev_private;
	struct exynos_drm_crtc *exynos_crtc =
		to_exynos_crtc(private->crtc[pipe]);

	if (!exynos_crtc->enabled)
		return -EPERM;

	if (exynos_crtc->ops->enable_vblank)
		return exynos_crtc->ops->enable_vblank(exynos_crtc);

	return 0;
}

void exynos_drm_crtc_disable_vblank(struct drm_device *dev, int pipe)
{
	struct exynos_drm_private *private = dev->dev_private;
	struct exynos_drm_crtc *exynos_crtc =
		to_exynos_crtc(private->crtc[pipe]);

	if (!exynos_crtc->enabled)
		return;

	if (exynos_crtc->ops->disable_vblank)
		exynos_crtc->ops->disable_vblank(exynos_crtc);
}

void exynos_drm_crtc_finish_pageflip(struct exynos_drm_crtc *exynos_crtc)
{
	struct drm_crtc *crtc = &exynos_crtc->base;
	unsigned long flags;

	spin_lock_irqsave(&crtc->dev->event_lock, flags);
	if (exynos_crtc->event) {

		drm_crtc_send_vblank_event(crtc, exynos_crtc->event);
		drm_crtc_vblank_put(crtc);
		wake_up(&exynos_crtc->pending_flip_queue);

	}

	exynos_crtc->event = NULL;
	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
}

void exynos_drm_crtc_complete_scanout(struct drm_framebuffer *fb)
{
	struct exynos_drm_crtc *exynos_crtc;
	struct drm_device *dev = fb->dev;
	struct drm_crtc *crtc;

	/*
	 * make sure that overlay data are updated to real hardware
	 * for all encoders.
	 */
	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
		exynos_crtc = to_exynos_crtc(crtc);

		/*
		 * wait for vblank interrupt
		 * - this makes sure that overlay data are updated to
		 *	real hardware.
		 */
		if (exynos_crtc->ops->wait_for_vblank)
			exynos_crtc->ops->wait_for_vblank(exynos_crtc);
	}
}

int exynos_drm_crtc_get_pipe_from_type(struct drm_device *drm_dev,
					unsigned int out_type)
{
	struct drm_crtc *crtc;

	list_for_each_entry(crtc, &drm_dev->mode_config.crtc_list, head) {
		struct exynos_drm_crtc *exynos_crtc;

		exynos_crtc = to_exynos_crtc(crtc);
		if (exynos_crtc->type == out_type)
			return exynos_crtc->pipe;
	}

	return -EPERM;
}

void exynos_drm_crtc_te_handler(struct drm_crtc *crtc)
{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

	if (exynos_crtc->ops->te_handler)
		exynos_crtc->ops->te_handler(exynos_crtc);
}