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/*

 * Copyright © 2007 David Airlie

 *

 * 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

 * THE AUTHORS OR COPYRIGHT HOLDERS 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.

 *

 * Authors:

 *     David Airlie

 */

#include 

#include 

#include 

#include 

//#include 

//#include 

#include 

//#include 

#include 

//#include 

//#include 

#include 

#include 

#include 

#include "intel_drv.h"

#include 

#include "i915_drv.h"

static struct drm_i915_gem_object *fb_obj;

struct drm_i915_gem_object *get_fb_obj()

{

    return fb_obj;

};

struct fb_info *framebuffer_alloc(size_t size, struct device *dev)

{

#define BYTES_PER_LONG (BITS_PER_LONG/8)

#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))

    int fb_info_size = sizeof(struct fb_info);

    struct fb_info *info;

    char *p;

    if (size)

        fb_info_size += PADDING;

    p = kzalloc(fb_info_size + size, GFP_KERNEL);

    if (!p)

        return NULL;

    info = (struct fb_info *) p;

    if (size)

        info->par = p + fb_info_size;

    return info;

#undef PADDING

#undef BYTES_PER_LONG

}

static struct fb_ops intelfb_ops = {

	.owner = THIS_MODULE,

	.fb_check_var = drm_fb_helper_check_var,

	.fb_set_par = drm_fb_helper_set_par,

//   .fb_fillrect = cfb_fillrect,

//   .fb_copyarea = cfb_copyarea,

//   .fb_imageblit = cfb_imageblit,

//   .fb_pan_display = drm_fb_helper_pan_display,

	.fb_blank = drm_fb_helper_blank,

//   .fb_setcmap = drm_fb_helper_setcmap,

//   .fb_debug_enter = drm_fb_helper_debug_enter,

//   .fb_debug_leave = drm_fb_helper_debug_leave,

};

static int intelfb_create(struct intel_fbdev *ifbdev,

			  struct drm_fb_helper_surface_size *sizes)

{

	struct drm_device *dev = ifbdev->helper.dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct fb_info *info;

	struct drm_framebuffer *fb;

	struct drm_mode_fb_cmd2 mode_cmd = {};

	struct drm_i915_gem_object *obj;

	struct device *device = &dev->pdev->dev;

	int size, ret;

	/* we don't do packed 24bpp */

	if (sizes->surface_bpp == 24)

		sizes->surface_bpp = 32;

	mode_cmd.width = sizes->surface_width;

	mode_cmd.height = sizes->surface_height;

	mode_cmd.pitches[0] = ALIGN(mode_cmd.width * ((sizes->surface_bpp + 7) /

						      8), 64);

	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,

							  sizes->surface_depth);

	size = mode_cmd.pitches[0] * mode_cmd.height;

	size = ALIGN(size, PAGE_SIZE);

	obj = i915_gem_alloc_object(dev, size);

	if (!obj) {

		DRM_ERROR("failed to allocate framebuffer\n");

		ret = -ENOMEM;

		goto out;

	}

	mutex_lock(&dev->struct_mutex);

#if 0

// skip this part and use existing framebiffer

	/* Flush everything out, we'll be doing GTT only from now on */

	ret = intel_pin_and_fence_fb_obj(dev, obj, false);

	if (ret) {

		DRM_ERROR("failed to pin fb: %d\n", ret);

		goto out_unref;

	}

#endif

/***********************************************************************/

    {

#define LFB_SIZE 0xC00000

        static struct drm_mm_node lfb_vm_node;

        lfb_vm_node.size = LFB_SIZE;

        lfb_vm_node.start = 0;

        lfb_vm_node.mm = NULL;

        obj->gtt_space = &lfb_vm_node;

        obj->gtt_offset = 0;

        obj->pin_count = 2;

        obj->cache_level = I915_CACHE_NONE;

	    obj->base.write_domain = 0;

	    obj->base.read_domains = I915_GEM_DOMAIN_GTT;

    }

/***********************************************************************/

	info = framebuffer_alloc(0, device);

	if (!info) {

		ret = -ENOMEM;

		goto out_unpin;

	}

	info->par = ifbdev;

	ret = intel_framebuffer_init(dev, &ifbdev->ifb, &mode_cmd, obj);

	if (ret)

		goto out_unpin;

	fb = &ifbdev->ifb.base;

	ifbdev->helper.fb = fb;

	ifbdev->helper.fbdev = info;

    strcpy(info->fix.id, "inteldrmfb");

    info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;

    info->fbops = &intelfb_ops;

    /* setup aperture base/size for vesafb takeover */

	info->apertures = alloc_apertures(1);

	if (!info->apertures) {

		ret = -ENOMEM;

		goto out_unpin;

	}

	info->apertures->ranges[0].base = dev->mode_config.fb_base;

	info->apertures->ranges[0].size =

		dev_priv->mm.gtt->gtt_mappable_entries << PAGE_SHIFT;

	info->fix.smem_start = dev->mode_config.fb_base + obj->gtt_offset;

	info->fix.smem_len = size;

	info->screen_base = (void*) 0xFE000000;

	info->screen_size = size;

//	memset(info->screen_base, 0, size);

	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);

	drm_fb_helper_fill_var(info, &ifbdev->helper, sizes->fb_width, sizes->fb_height);

	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */

	DRM_DEBUG_KMS("allocated %dx%d fb: 0x%08x, bo %p\n",

		      fb->width, fb->height,

		      obj->gtt_offset, obj);

	mutex_unlock(&dev->struct_mutex);

//   vga_switcheroo_client_fb_set(dev->pdev, info);

    fb_obj = obj;

	return 0;

out_unpin:

	i915_gem_object_unpin(obj);

out_unref:

	drm_gem_object_unreference(&obj->base);

	mutex_unlock(&dev->struct_mutex);

out:

	return ret;

}

static int intel_fb_find_or_create_single(struct drm_fb_helper *helper,

					  struct drm_fb_helper_surface_size *sizes)

{

	struct intel_fbdev *ifbdev = (struct intel_fbdev *)helper;

	int new_fb = 0;

	int ret;

	if (!helper->fb) {

		ret = intelfb_create(ifbdev, sizes);

		if (ret)

			return ret;

		new_fb = 1;

	}

	return new_fb;

}

static struct drm_fb_helper_funcs intel_fb_helper_funcs = {

	.gamma_set = intel_crtc_fb_gamma_set,

	.gamma_get = intel_crtc_fb_gamma_get,

    .fb_probe = intel_fb_find_or_create_single,

};

int intel_fbdev_init(struct drm_device *dev)

{

	struct intel_fbdev *ifbdev;

	drm_i915_private_t *dev_priv = dev->dev_private;

	int ret;

	ifbdev = kzalloc(sizeof(struct intel_fbdev), GFP_KERNEL);

	if (!ifbdev)

		return -ENOMEM;

	dev_priv->fbdev = ifbdev;

	ifbdev->helper.funcs = &intel_fb_helper_funcs;

	ret = drm_fb_helper_init(dev, &ifbdev->helper,

				 dev_priv->num_pipe,

				 INTELFB_CONN_LIMIT);

	if (ret) {

		kfree(ifbdev);

		return ret;

	}

	drm_fb_helper_single_add_all_connectors(&ifbdev->helper);

	drm_fb_helper_initial_config(&ifbdev->helper, 32);

    return 0;

}