/* exynos_drm_fb.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>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include "drmP.h"
#include "drm_crtc.h"
#include "drm_crtc_helper.h"
#include "drm_fb_helper.h"

#include "exynos_drm_drv.h"
#include "exynos_drm_fb.h"
#include "exynos_drm_buf.h"
#include "exynos_drm_gem.h"

#define to_exynos_fb(x)	container_of(x, struct exynos_drm_fb, fb)

/*
 * exynos specific framebuffer structure.
 *
 * @fb: drm framebuffer obejct.
 * @exynos_gem_obj: exynos specific gem object containing a gem object.
 * @buffer: pointer to exynos_drm_gem_buffer object.
 *	- contain the memory information to memory region allocated
 *	at default framebuffer creation.
 */
struct exynos_drm_fb {
	struct drm_framebuffer		fb;
	struct exynos_drm_gem_obj	*exynos_gem_obj;
	struct exynos_drm_gem_buf	*buffer;
};

static void exynos_drm_fb_destroy(struct drm_framebuffer *fb)
{
	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	drm_framebuffer_cleanup(fb);

	/*
	 * default framebuffer has no gem object so
	 * a buffer of the default framebuffer should be released at here.
	 */
	if (!exynos_fb->exynos_gem_obj && exynos_fb->buffer)
		exynos_drm_buf_destroy(fb->dev, exynos_fb->buffer);

	kfree(exynos_fb);
	exynos_fb = NULL;
}

static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
					struct drm_file *file_priv,
					unsigned int *handle)
{
	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	return drm_gem_handle_create(file_priv,
			&exynos_fb->exynos_gem_obj->base, handle);
}

static int exynos_drm_fb_dirty(struct drm_framebuffer *fb,
				struct drm_file *file_priv, unsigned flags,
				unsigned color, struct drm_clip_rect *clips,
				unsigned num_clips)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	/* TODO */

	return 0;
}

static struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
	.destroy	= exynos_drm_fb_destroy,
	.create_handle	= exynos_drm_fb_create_handle,
	.dirty		= exynos_drm_fb_dirty,
};

static struct drm_framebuffer *
exynos_drm_fb_init(struct drm_file *file_priv, struct drm_device *dev,
		   struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct exynos_drm_fb *exynos_fb;
	struct drm_framebuffer *fb;
	struct exynos_drm_gem_obj *exynos_gem_obj = NULL;
	struct drm_gem_object *obj;
	unsigned int size;
	int ret;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	DRM_LOG_KMS("drm fb create(%dx%d)\n",
			mode_cmd->width, mode_cmd->height);

	exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
	if (!exynos_fb) {
		DRM_ERROR("failed to allocate exynos drm framebuffer.\n");
		return ERR_PTR(-ENOMEM);
	}

	fb = &exynos_fb->fb;
	ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs);
	if (ret) {
		DRM_ERROR("failed to initialize framebuffer.\n");
		goto err_init;
	}

	DRM_LOG_KMS("create: fb id: %d\n", fb->base.id);

	size = mode_cmd->pitches[0] * mode_cmd->height;

	/*
	 * mode_cmd->handles[0] could be NULL at booting time or
	 * with user request. if NULL, a new buffer or a gem object
	 * would be allocated.
	 */
	if (!mode_cmd->handles[0]) {
		if (!file_priv) {
			struct exynos_drm_gem_buf *buffer;

			/*
			 * in case that file_priv is NULL, it allocates
			 * only buffer and this buffer would be used
			 * for default framebuffer.
			 */
			buffer = exynos_drm_buf_create(dev, size);
			if (IS_ERR(buffer)) {
				ret = PTR_ERR(buffer);
				goto err_buffer;
			}

			exynos_fb->buffer = buffer;

			DRM_LOG_KMS("default: dma_addr = 0x%lx, size = 0x%x\n",
					(unsigned long)buffer->dma_addr, size);

			goto out;
		} else {
			exynos_gem_obj = exynos_drm_gem_create(dev, file_priv,
							&mode_cmd->handles[0],
							size);
			if (IS_ERR(exynos_gem_obj)) {
				ret = PTR_ERR(exynos_gem_obj);
				goto err_buffer;
			}
		}
	} else {
		obj = drm_gem_object_lookup(dev, file_priv,
				mode_cmd->handles[0]);
		if (!obj) {
			DRM_ERROR("failed to lookup gem object.\n");
			goto err_buffer;
		}

		exynos_gem_obj = to_exynos_gem_obj(obj);

		drm_gem_object_unreference_unlocked(obj);
	}

	/*
	 * if got a exynos_gem_obj from either a handle or
	 * a new creation then exynos_fb->exynos_gem_obj is NULL
	 * so that default framebuffer has no its own gem object,
	 * only its own buffer object.
	 */
	exynos_fb->buffer = exynos_gem_obj->buffer;

	DRM_LOG_KMS("dma_addr = 0x%lx, size = 0x%x, gem object = 0x%x\n",
			(unsigned long)exynos_fb->buffer->dma_addr, size,
			(unsigned int)&exynos_gem_obj->base);

out:
	exynos_fb->exynos_gem_obj = exynos_gem_obj;

	drm_helper_mode_fill_fb_struct(fb, mode_cmd);

	return fb;

err_buffer:
	drm_framebuffer_cleanup(fb);

err_init:
	kfree(exynos_fb);

	return ERR_PTR(ret);
}

struct drm_framebuffer *exynos_drm_fb_create(struct drm_device *dev,
					     struct drm_file *file_priv,
					     struct drm_mode_fb_cmd2 *mode_cmd)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	return exynos_drm_fb_init(file_priv, dev, mode_cmd);
}

struct exynos_drm_gem_buf *exynos_drm_fb_get_buf(struct drm_framebuffer *fb)
{
	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
	struct exynos_drm_gem_buf *buffer;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	buffer = exynos_fb->buffer;
	if (!buffer)
		return NULL;

	DRM_DEBUG_KMS("vaddr = 0x%lx, dma_addr = 0x%lx\n",
			(unsigned long)buffer->kvaddr,
			(unsigned long)buffer->dma_addr);

	return buffer;
}

static void exynos_drm_output_poll_changed(struct drm_device *dev)
{
	struct exynos_drm_private *private = dev->dev_private;
	struct drm_fb_helper *fb_helper = private->fb_helper;

	if (fb_helper)
		drm_fb_helper_hotplug_event(fb_helper);
}

static struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
	.fb_create = exynos_drm_fb_create,
	.output_poll_changed = exynos_drm_output_poll_changed,
};

void exynos_drm_mode_config_init(struct drm_device *dev)
{
	dev->mode_config.min_width = 0;
	dev->mode_config.min_height = 0;

	/*
	 * set max width and height as default value(4096x4096).
	 * this value would be used to check framebuffer size limitation
	 * at drm_mode_addfb().
	 */
	dev->mode_config.max_width = 4096;
	dev->mode_config.max_height = 4096;

	dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
}

MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
MODULE_DESCRIPTION("Samsung SoC DRM FB Driver");
MODULE_LICENSE("GPL");