/* 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_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->ops->enable)
                exynos_crtc->ops->enable(exynos_crtc);

        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);

        drm_crtc_vblank_off(crtc);

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

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 int exynos_crtc_atomic_check(struct drm_crtc *crtc,
                                     struct drm_crtc_state *state)
{
        struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

        if (!state->enable)
                return 0;

        if (exynos_crtc->ops->atomic_check)
                return exynos_crtc->ops->atomic_check(exynos_crtc, state);

        return 0;
}

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 (exynos_crtc->ops->atomic_begin)
                exynos_crtc->ops->atomic_begin(exynos_crtc);
}

static void exynos_crtc_atomic_flush(struct drm_crtc *crtc,
                                     struct drm_crtc_state *old_crtc_state)
{
        struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
        struct drm_pending_vblank_event *event;
        unsigned long flags;

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

        event = crtc->state->event;
        if (event) {
                crtc->state->event = NULL;

                spin_lock_irqsave(&crtc->dev->event_lock, flags);
                if (drm_crtc_vblank_get(crtc) == 0)
                        drm_crtc_arm_vblank_event(crtc, event);
                else
                        drm_crtc_send_vblank_event(crtc, event);
                spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
        }

}

static const struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
        .enable         = exynos_drm_crtc_enable,
        .disable        = exynos_drm_crtc_disable,
        .mode_set_nofb  = exynos_drm_crtc_mode_set_nofb,
        .atomic_check   = exynos_crtc_atomic_check,
        .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 const 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);

        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, NULL);
        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, unsigned int pipe)
{
        struct exynos_drm_crtc *exynos_crtc = exynos_drm_crtc_from_pipe(dev,
                                                                        pipe);

        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, unsigned int pipe)
{
        struct exynos_drm_crtc *exynos_crtc = exynos_drm_crtc_from_pipe(dev,
                                                                        pipe);

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

int exynos_drm_crtc_get_pipe_from_type(struct drm_device *drm_dev,
                                       enum exynos_drm_output_type 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);
}

void exynos_drm_crtc_cancel_page_flip(struct drm_crtc *crtc,
                                        struct drm_file *file)
{
        struct drm_pending_vblank_event *e;
        unsigned long flags;

        spin_lock_irqsave(&crtc->dev->event_lock, flags);

        e = crtc->state->event;
        if (e && e->base.file_priv == file)
                crtc->state->event = NULL;
        else
                e = NULL;

        spin_unlock_irqrestore(&crtc->dev->event_lock, flags);

        if (e)
                drm_event_cancel_free(crtc->dev, &e->base);
}