[linux-2.6-block.git] / drivers / gpu / drm / exynos / exynos_drm_fbdev.c

/* exynos_drm_fbdev.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_fb_helper.h"
#include "drm_crtc_helper.h"

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

#define MAX_CONNECTOR		4
#define PREFERRED_BPP		32

#define to_exynos_fbdev(x)	container_of(x, struct exynos_drm_fbdev,\
				drm_fb_helper)

struct exynos_drm_fbdev {
	struct drm_fb_helper	drm_fb_helper;
	struct drm_framebuffer	*fb;
};

static int exynos_drm_fbdev_set_par(struct fb_info *info)
{
	struct fb_var_screeninfo *var = &info->var;

	switch (var->bits_per_pixel) {
	case 32:
	case 24:
	case 18:
	case 16:
	case 12:
		info->fix.visual = FB_VISUAL_TRUECOLOR;
		break;
	case 1:
		info->fix.visual = FB_VISUAL_MONO01;
		break;
	default:
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		break;
	}

	info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;

	return drm_fb_helper_set_par(info);
}


static struct fb_ops exynos_drm_fb_ops = {
	.owner		= THIS_MODULE,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
	.fb_check_var	= drm_fb_helper_check_var,
	.fb_set_par	= exynos_drm_fbdev_set_par,
	.fb_blank	= drm_fb_helper_blank,
	.fb_pan_display	= drm_fb_helper_pan_display,
	.fb_setcmap	= drm_fb_helper_setcmap,
};

static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
				     struct drm_framebuffer *fb)
{
	struct fb_info *fbi = helper->fbdev;
	struct drm_device *dev = helper->dev;
	struct exynos_drm_fbdev *exynos_fb = to_exynos_fbdev(helper);
	struct exynos_drm_gem_buf *buffer;
	unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
	unsigned long offset;

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

	exynos_fb->fb = fb;

	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
	drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);

	buffer = exynos_drm_fb_get_buf(fb);
	if (!buffer) {
		DRM_LOG_KMS("buffer is null.\n");
		return -EFAULT;
	}

	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
	offset += fbi->var.yoffset * fb->pitches[0];

	dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
	fbi->screen_base = buffer->kvaddr + offset;
	fbi->fix.smem_start = (unsigned long)(buffer->dma_addr + offset);
	fbi->screen_size = size;
	fbi->fix.smem_len = size;

	return 0;
}

static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
				    struct drm_fb_helper_surface_size *sizes)
{
	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
	struct drm_device *dev = helper->dev;
	struct fb_info *fbi;
	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
	struct platform_device *pdev = dev->platformdev;
	int ret;

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

	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
			sizes->surface_width, sizes->surface_height,
			sizes->surface_bpp);

	mode_cmd.width = sizes->surface_width;
	mode_cmd.height = sizes->surface_height;
	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
							  sizes->surface_depth);

	mutex_lock(&dev->struct_mutex);

	fbi = framebuffer_alloc(0, &pdev->dev);
	if (!fbi) {
		DRM_ERROR("failed to allocate fb info.\n");
		ret = -ENOMEM;
		goto out;
	}

	exynos_fbdev->fb = exynos_drm_fb_create(dev, NULL, &mode_cmd);
	if (IS_ERR_OR_NULL(exynos_fbdev->fb)) {
		DRM_ERROR("failed to create drm framebuffer.\n");
		ret = PTR_ERR(exynos_fbdev->fb);
		goto out;
	}

	helper->fb = exynos_fbdev->fb;
	helper->fbdev = fbi;

	fbi->par = helper;
	fbi->flags = FBINFO_FLAG_DEFAULT;
	fbi->fbops = &exynos_drm_fb_ops;

	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
	if (ret) {
		DRM_ERROR("failed to allocate cmap.\n");
		goto out;
	}

	ret = exynos_drm_fbdev_update(helper, helper->fb);
	if (ret < 0)
		fb_dealloc_cmap(&fbi->cmap);

/*
 * if failed, all resources allocated above would be released by
 * drm_mode_config_cleanup() when drm_load() had been called prior
 * to any specific driver such as fimd or hdmi driver.
 */
out:
	mutex_unlock(&dev->struct_mutex);
	return ret;
}

static bool
exynos_drm_fbdev_is_samefb(struct drm_framebuffer *fb,
			    struct drm_fb_helper_surface_size *sizes)
{
	if (fb->width != sizes->surface_width)
		return false;
	if (fb->height != sizes->surface_height)
		return false;
	if (fb->bits_per_pixel != sizes->surface_bpp)
		return false;
	if (fb->depth != sizes->surface_depth)
		return false;

	return true;
}

static int exynos_drm_fbdev_recreate(struct drm_fb_helper *helper,
				      struct drm_fb_helper_surface_size *sizes)
{
	struct drm_device *dev = helper->dev;
	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
	struct drm_framebuffer *fb = exynos_fbdev->fb;
	struct drm_mode_fb_cmd2 mode_cmd = { 0 };

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

	if (helper->fb != fb) {
		DRM_ERROR("drm framebuffer is different\n");
		return -EINVAL;
	}

	if (exynos_drm_fbdev_is_samefb(fb, sizes))
		return 0;

	mode_cmd.width = sizes->surface_width;
	mode_cmd.height = sizes->surface_height;
	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
							  sizes->surface_depth);

	if (fb->funcs->destroy)
		fb->funcs->destroy(fb);

	exynos_fbdev->fb = exynos_drm_fb_create(dev, NULL, &mode_cmd);
	if (IS_ERR(exynos_fbdev->fb)) {
		DRM_ERROR("failed to allocate fb.\n");
		return PTR_ERR(exynos_fbdev->fb);
	}

	helper->fb = exynos_fbdev->fb;
	return exynos_drm_fbdev_update(helper, helper->fb);
}

static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
				   struct drm_fb_helper_surface_size *sizes)
{
	int ret = 0;

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

	if (!helper->fb) {
		ret = exynos_drm_fbdev_create(helper, sizes);
		if (ret < 0) {
			DRM_ERROR("failed to create fbdev.\n");
			return ret;
		}

		/*
		 * fb_helper expects a value more than 1 if succeed
		 * because register_framebuffer() should be called.
		 */
		ret = 1;
	} else {
		ret = exynos_drm_fbdev_recreate(helper, sizes);
		if (ret < 0) {
			DRM_ERROR("failed to reconfigure fbdev\n");
			return ret;
		}
	}

	return ret;
}

static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
	.fb_probe =	exynos_drm_fbdev_probe,
};

int exynos_drm_fbdev_init(struct drm_device *dev)
{
	struct exynos_drm_fbdev *fbdev;
	struct exynos_drm_private *private = dev->dev_private;
	struct drm_fb_helper *helper;
	unsigned int num_crtc;
	int ret;

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

	if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
		return 0;

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

	private->fb_helper = helper = &fbdev->drm_fb_helper;
	helper->funcs = &exynos_drm_fb_helper_funcs;

	num_crtc = dev->mode_config.num_crtc;

	ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
	if (ret < 0) {
		DRM_ERROR("failed to initialize drm fb helper.\n");
		goto err_init;
	}

	ret = drm_fb_helper_single_add_all_connectors(helper);
	if (ret < 0) {
		DRM_ERROR("failed to register drm_fb_helper_connector.\n");
		goto err_setup;

	}

	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
	if (ret < 0) {
		DRM_ERROR("failed to set up hw configuration.\n");
		goto err_setup;
	}

	return 0;

err_setup:
	drm_fb_helper_fini(helper);

err_init:
	private->fb_helper = NULL;
	kfree(fbdev);

	return ret;
}

static void exynos_drm_fbdev_destroy(struct drm_device *dev,
				      struct drm_fb_helper *fb_helper)
{
	struct drm_framebuffer *fb;

	/* release drm framebuffer and real buffer */
	if (fb_helper->fb && fb_helper->fb->funcs) {
		fb = fb_helper->fb;
		if (fb && fb->funcs->destroy)
			fb->funcs->destroy(fb);
	}

	/* release linux framebuffer */
	if (fb_helper->fbdev) {
		struct fb_info *info;
		int ret;

		info = fb_helper->fbdev;
		ret = unregister_framebuffer(info);
		if (ret < 0)
			DRM_DEBUG_KMS("failed unregister_framebuffer()\n");

		if (info->cmap.len)
			fb_dealloc_cmap(&info->cmap);

		framebuffer_release(info);
	}

	drm_fb_helper_fini(fb_helper);
}

void exynos_drm_fbdev_fini(struct drm_device *dev)
{
	struct exynos_drm_private *private = dev->dev_private;
	struct exynos_drm_fbdev *fbdev;

	if (!private || !private->fb_helper)
		return;

	fbdev = to_exynos_fbdev(private->fb_helper);

	exynos_drm_fbdev_destroy(dev, private->fb_helper);
	kfree(fbdev);
	private->fb_helper = NULL;
}

void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
{
	struct exynos_drm_private *private = dev->dev_private;

	if (!private || !private->fb_helper)
		return;

	drm_fb_helper_restore_fbdev_mode(private->fb_helper);
}

int exynos_drm_fbdev_reinit(struct drm_device *dev)
{
	struct exynos_drm_private *private = dev->dev_private;
	struct drm_fb_helper *fb_helper;
	int ret;

	if (!private)
		return -EINVAL;

	/*
	 * if all sub drivers were unloaded then num_connector is 0
	 * so at this time, the framebuffers also should be destroyed.
	 */
	if (!dev->mode_config.num_connector) {
		exynos_drm_fbdev_fini(dev);
		return 0;
	}

	fb_helper = private->fb_helper;

	if (fb_helper) {
		struct list_head temp_list;

		INIT_LIST_HEAD(&temp_list);

		/*
		 * fb_helper is reintialized but kernel fb is reused
		 * so kernel_fb_list need to be backuped and restored
		 */
		if (!list_empty(&fb_helper->kernel_fb_list))
			list_replace_init(&fb_helper->kernel_fb_list,
					&temp_list);

		drm_fb_helper_fini(fb_helper);

		ret = drm_fb_helper_init(dev, fb_helper,
				dev->mode_config.num_crtc, MAX_CONNECTOR);
		if (ret < 0) {
			DRM_ERROR("failed to initialize drm fb helper\n");
			return ret;
		}

		if (!list_empty(&temp_list))
			list_replace(&temp_list, &fb_helper->kernel_fb_list);

		ret = drm_fb_helper_single_add_all_connectors(fb_helper);
		if (ret < 0) {
			DRM_ERROR("failed to add fb helper to connectors\n");
			goto err;
		}

		ret = drm_fb_helper_initial_config(fb_helper, PREFERRED_BPP);
		if (ret < 0) {
			DRM_ERROR("failed to set up hw configuration.\n");
			goto err;
		}
	} else {
		/*
		 * if drm_load() failed whem drm load() was called prior
		 * to specific drivers, fb_helper must be NULL and so
		 * this fuction should be called again to re-initialize and
		 * re-configure the fb helper. it means that this function
		 * has been called by the specific drivers.
		 */
		ret = exynos_drm_fbdev_init(dev);
	}

	return ret;

err:
	/*
	 * if drm_load() failed when drm load() was called prior
	 * to specific drivers, the fb_helper must be NULL and so check it.
	 */
	if (fb_helper)
		drm_fb_helper_fini(fb_helper);

	return ret;
}

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 FBDEV Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
1c248b7d ID	1	/* exynos_drm_fbdev.c
	2	*
	3	* Copyright (c) 2011 Samsung Electronics Co., Ltd.
	4	* Authors:
	5	* Inki Dae <inki.dae@samsung.com>
	6	* Joonyoung Shim <jy0922.shim@samsung.com>
	7	* Seung-Woo Kim <sw0312.kim@samsung.com>
	8	*
	9	* Permission is hereby granted, free of charge, to any person obtaining a
	10	* copy of this software and associated documentation files (the "Software"),
	11	* to deal in the Software without restriction, including without limitation
	12	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	13	* and/or sell copies of the Software, and to permit persons to whom the
	14	* Software is furnished to do so, subject to the following conditions:
	15	*
	16	* The above copyright notice and this permission notice (including the next
	17	* paragraph) shall be included in all copies or substantial portions of the
	18	* Software.
	19	*
	20	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	21	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	23	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	24	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	25	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	26	* OTHER DEALINGS IN THE SOFTWARE.
	27	*/
	28
	29	#include "drmP.h"
	30	#include "drm_crtc.h"
	31	#include "drm_fb_helper.h"
	32	#include "drm_crtc_helper.h"
	33
	34	#include "exynos_drm_drv.h"
	35	#include "exynos_drm_fb.h"
2c871127	36	#include "exynos_drm_gem.h"
19c8b834	37	#include "exynos_drm_buf.h"
1c248b7d ID	38
	39	#define MAX_CONNECTOR 4
	40	#define PREFERRED_BPP 32
	41
	42	#define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\
	43	drm_fb_helper)
	44
	45	struct exynos_drm_fbdev {
	46	struct drm_fb_helper drm_fb_helper;
	47	struct drm_framebuffer *fb;
	48	};
	49
	50	static int exynos_drm_fbdev_set_par(struct fb_info *info)
	51	{
	52	struct fb_var_screeninfo *var = &info->var;
	53
	54	switch (var->bits_per_pixel) {
	55	case 32:
	56	case 24:
	57	case 18:
	58	case 16:
	59	case 12:
	60	info->fix.visual = FB_VISUAL_TRUECOLOR;
	61	break;
	62	case 1:
	63	info->fix.visual = FB_VISUAL_MONO01;
	64	break;
	65	default:
	66	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
	67	break;
	68	}
	69
	70	info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
	71
	72	return drm_fb_helper_set_par(info);
	73	}
	74
	75
	76	static struct fb_ops exynos_drm_fb_ops = {
	77	.owner = THIS_MODULE,
	78	.fb_fillrect = cfb_fillrect,
	79	.fb_copyarea = cfb_copyarea,
	80	.fb_imageblit = cfb_imageblit,
	81	.fb_check_var = drm_fb_helper_check_var,
	82	.fb_set_par = exynos_drm_fbdev_set_par,
	83	.fb_blank = drm_fb_helper_blank,
	84	.fb_pan_display = drm_fb_helper_pan_display,
	85	.fb_setcmap = drm_fb_helper_setcmap,
	86	};
	87
19c8b834	88	static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
aa6b2b6c	89	struct drm_framebuffer *fb)
1c248b7d ID	90	{
	91	struct fb_info *fbi = helper->fbdev;
	92	struct drm_device *dev = helper->dev;
	93	struct exynos_drm_fbdev *exynos_fb = to_exynos_fbdev(helper);
2c871127	94	struct exynos_drm_gem_buf *buffer;
aa6b2b6c	95	unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
19c8b834	96	unsigned long offset;
1c248b7d ID	97
	98	DRM_DEBUG_KMS("%s\n", __FILE__);
	99
	100	exynos_fb->fb = fb;
	101
01f2c773	102	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
aa6b2b6c	103	drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
1c248b7d	104
2c871127 ID	105	buffer = exynos_drm_fb_get_buf(fb);
	106	if (!buffer) {
	107	DRM_LOG_KMS("buffer is null.\n");
19c8b834 ID	108	return -EFAULT;
19c8b834 ID	109	}
1c248b7d	110
19c8b834	111	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
01f2c773	112	offset += fbi->var.yoffset * fb->pitches[0];
1c248b7d	113
2c871127 ID	114	dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
	115	fbi->screen_base = buffer->kvaddr + offset;
	116	fbi->fix.smem_start = (unsigned long)(buffer->dma_addr + offset);
1c248b7d	117	fbi->screen_size = size;
1c248b7d	118	fbi->fix.smem_len = size;
19c8b834 ID	119
19c8b834 ID	120	return 0;
1c248b7d ID	121	}
	122
	123	static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
	124	struct drm_fb_helper_surface_size *sizes)
	125	{
	126	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
	127	struct drm_device *dev = helper->dev;
	128	struct fb_info *fbi;
a794d57d	129	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
1c248b7d ID	130	struct platform_device *pdev = dev->platformdev;
	131	int ret;
	132
	133	DRM_DEBUG_KMS("%s\n", __FILE__);
	134
	135	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
	136	sizes->surface_width, sizes->surface_height,
	137	sizes->surface_bpp);
	138
	139	mode_cmd.width = sizes->surface_width;
	140	mode_cmd.height = sizes->surface_height;
a794d57d JS	141	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
	142	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
	143	sizes->surface_depth);
1c248b7d ID	144
	145	mutex_lock(&dev->struct_mutex);
	146
	147	fbi = framebuffer_alloc(0, &pdev->dev);
	148	if (!fbi) {
	149	DRM_ERROR("failed to allocate fb info.\n");
	150	ret = -ENOMEM;
	151	goto out;
	152	}
	153
	154	exynos_fbdev->fb = exynos_drm_fb_create(dev, NULL, &mode_cmd);
	155	if (IS_ERR_OR_NULL(exynos_fbdev->fb)) {
	156	DRM_ERROR("failed to create drm framebuffer.\n");
	157	ret = PTR_ERR(exynos_fbdev->fb);
	158	goto out;
	159	}
	160
	161	helper->fb = exynos_fbdev->fb;
	162	helper->fbdev = fbi;
	163
	164	fbi->par = helper;
	165	fbi->flags = FBINFO_FLAG_DEFAULT;
	166	fbi->fbops = &exynos_drm_fb_ops;
	167
	168	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
	169	if (ret) {
	170	DRM_ERROR("failed to allocate cmap.\n");
	171	goto out;
	172	}
	173
aa6b2b6c	174	ret = exynos_drm_fbdev_update(helper, helper->fb);
19c8b834 ID	175	if (ret < 0)
19c8b834 ID	176	fb_dealloc_cmap(&fbi->cmap);
1c248b7d ID	177
	178	/*
	179	* if failed, all resources allocated above would be released by
	180	* drm_mode_config_cleanup() when drm_load() had been called prior
	181	* to any specific driver such as fimd or hdmi driver.
	182	*/
	183	out:
	184	mutex_unlock(&dev->struct_mutex);
	185	return ret;
	186	}
	187
	188	static bool
	189	exynos_drm_fbdev_is_samefb(struct drm_framebuffer *fb,
	190	struct drm_fb_helper_surface_size *sizes)
	191	{
	192	if (fb->width != sizes->surface_width)
	193	return false;
	194	if (fb->height != sizes->surface_height)
	195	return false;
	196	if (fb->bits_per_pixel != sizes->surface_bpp)
	197	return false;
	198	if (fb->depth != sizes->surface_depth)
	199	return false;
	200
	201	return true;
	202	}
	203
	204	static int exynos_drm_fbdev_recreate(struct drm_fb_helper *helper,
	205	struct drm_fb_helper_surface_size *sizes)
	206	{
	207	struct drm_device *dev = helper->dev;
	208	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
	209	struct drm_framebuffer *fb = exynos_fbdev->fb;
a794d57d	210	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
1c248b7d ID	211
	212	DRM_DEBUG_KMS("%s\n", __FILE__);
	213
	214	if (helper->fb != fb) {
	215	DRM_ERROR("drm framebuffer is different\n");
	216	return -EINVAL;
	217	}
	218
	219	if (exynos_drm_fbdev_is_samefb(fb, sizes))
	220	return 0;
	221
	222	mode_cmd.width = sizes->surface_width;
	223	mode_cmd.height = sizes->surface_height;
a794d57d JS	224	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
	225	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
	226	sizes->surface_depth);
1c248b7d ID	227
	228	if (fb->funcs->destroy)
	229	fb->funcs->destroy(fb);
	230
	231	exynos_fbdev->fb = exynos_drm_fb_create(dev, NULL, &mode_cmd);
	232	if (IS_ERR(exynos_fbdev->fb)) {
	233	DRM_ERROR("failed to allocate fb.\n");
	234	return PTR_ERR(exynos_fbdev->fb);
	235	}
	236
	237	helper->fb = exynos_fbdev->fb;
aa6b2b6c	238	return exynos_drm_fbdev_update(helper, helper->fb);
1c248b7d ID	239	}
	240
	241	static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
	242	struct drm_fb_helper_surface_size *sizes)
	243	{
	244	int ret = 0;
	245
	246	DRM_DEBUG_KMS("%s\n", __FILE__);
	247
	248	if (!helper->fb) {
	249	ret = exynos_drm_fbdev_create(helper, sizes);
	250	if (ret < 0) {
	251	DRM_ERROR("failed to create fbdev.\n");
	252	return ret;
	253	}
	254
	255	/*
	256	* fb_helper expects a value more than 1 if succeed
	257	* because register_framebuffer() should be called.
	258	*/
	259	ret = 1;
	260	} else {
	261	ret = exynos_drm_fbdev_recreate(helper, sizes);
	262	if (ret < 0) {
	263	DRM_ERROR("failed to reconfigure fbdev\n");
	264	return ret;
	265	}
	266	}
	267
	268	return ret;
	269	}
	270
	271	static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
	272	.fb_probe = exynos_drm_fbdev_probe,
	273	};
	274
	275	int exynos_drm_fbdev_init(struct drm_device *dev)
	276	{
	277	struct exynos_drm_fbdev *fbdev;
	278	struct exynos_drm_private *private = dev->dev_private;
	279	struct drm_fb_helper *helper;
	280	unsigned int num_crtc;
	281	int ret;
	282
	283	DRM_DEBUG_KMS("%s\n", __FILE__);
	284
	285	if (!dev->mode_config.num_crtc \|\| !dev->mode_config.num_connector)
	286	return 0;
	287
	288	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
	289	if (!fbdev) {
	290	DRM_ERROR("failed to allocate drm fbdev.\n");
	291	return -ENOMEM;
	292	}
	293
	294	private->fb_helper = helper = &fbdev->drm_fb_helper;
	295	helper->funcs = &exynos_drm_fb_helper_funcs;
	296
	297	num_crtc = dev->mode_config.num_crtc;
	298
	299	ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
	300	if (ret < 0) {
	301	DRM_ERROR("failed to initialize drm fb helper.\n");
	302	goto err_init;
303	}
304
305	ret = drm_fb_helper_single_add_all_connectors(helper);
306	if (ret < 0) {
307	DRM_ERROR("failed to register drm_fb_helper_connector.\n");
308	goto err_setup;
309
310	}
311
312	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
313	if (ret < 0) {
314	DRM_ERROR("failed to set up hw configuration.\n");
315	goto err_setup;
316	}
317
318	return 0;
319
320	err_setup:
321	drm_fb_helper_fini(helper);
322
323	err_init:
324	private->fb_helper = NULL;
325	kfree(fbdev);
326
327	return ret;
328	}
329
330	static void exynos_drm_fbdev_destroy(struct drm_device *dev,
331	struct drm_fb_helper *fb_helper)
332	{
333	struct drm_framebuffer *fb;
334
335	/* release drm framebuffer and real buffer */
336	if (fb_helper->fb && fb_helper->fb->funcs) {
337	fb = fb_helper->fb;
338	if (fb && fb->funcs->destroy)
339	fb->funcs->destroy(fb);
340	}
341
342	/* release linux framebuffer */
343	if (fb_helper->fbdev) {
344	struct fb_info *info;
345	int ret;
346
347	info = fb_helper->fbdev;
348	ret = unregister_framebuffer(info);
349	if (ret < 0)
350	DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
351
352	if (info->cmap.len)
353	fb_dealloc_cmap(&info->cmap);
354
355	framebuffer_release(info);
356	}
357
358	drm_fb_helper_fini(fb_helper);
359	}
360
361	void exynos_drm_fbdev_fini(struct drm_device *dev)
362	{
363	struct exynos_drm_private *private = dev->dev_private;
364	struct exynos_drm_fbdev *fbdev;
365
366	if (!private \|\| !private->fb_helper)
367	return;
368
369	fbdev = to_exynos_fbdev(private->fb_helper);
370
371	exynos_drm_fbdev_destroy(dev, private->fb_helper);
372	kfree(fbdev);
373	private->fb_helper = NULL;
374	}
375
376	void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
377	{
378	struct exynos_drm_private *private = dev->dev_private;
379
380	if (!private \|\| !private->fb_helper)
381	return;
382
383	drm_fb_helper_restore_fbdev_mode(private->fb_helper);
384	}
385
386	int exynos_drm_fbdev_reinit(struct drm_device *dev)
387	{
388	struct exynos_drm_private *private = dev->dev_private;
389	struct drm_fb_helper *fb_helper;
390	int ret;
391
392	if (!private)
393	return -EINVAL;
394
f6b98252 ID	395	/*
	396	* if all sub drivers were unloaded then num_connector is 0
	397	* so at this time, the framebuffers also should be destroyed.
	398	*/
1c248b7d ID	399	if (!dev->mode_config.num_connector) {
	400	exynos_drm_fbdev_fini(dev);
	401	return 0;
	402	}
	403
	404	fb_helper = private->fb_helper;
	405
	406	if (fb_helper) {
84b46990 JS	407	struct list_head temp_list;
	408
	409	INIT_LIST_HEAD(&temp_list);
	410
	411	/*
	412	* fb_helper is reintialized but kernel fb is reused
	413	* so kernel_fb_list need to be backuped and restored
	414	*/
	415	if (!list_empty(&fb_helper->kernel_fb_list))
	416	list_replace_init(&fb_helper->kernel_fb_list,
	417	&temp_list);
	418
1c248b7d ID	419	drm_fb_helper_fini(fb_helper);
	420
	421	ret = drm_fb_helper_init(dev, fb_helper,
	422	dev->mode_config.num_crtc, MAX_CONNECTOR);
	423	if (ret < 0) {
	424	DRM_ERROR("failed to initialize drm fb helper\n");
	425	return ret;
	426	}
	427
84b46990 JS	428	if (!list_empty(&temp_list))
	429	list_replace(&temp_list, &fb_helper->kernel_fb_list);
	430
1c248b7d ID	431	ret = drm_fb_helper_single_add_all_connectors(fb_helper);
	432	if (ret < 0) {
	433	DRM_ERROR("failed to add fb helper to connectors\n");
	434	goto err;
	435	}
	436
	437	ret = drm_fb_helper_initial_config(fb_helper, PREFERRED_BPP);
	438	if (ret < 0) {
	439	DRM_ERROR("failed to set up hw configuration.\n");
	440	goto err;
	441	}
	442	} else {
	443	/*
	444	* if drm_load() failed whem drm load() was called prior
	445	* to specific drivers, fb_helper must be NULL and so
	446	* this fuction should be called again to re-initialize and
	447	* re-configure the fb helper. it means that this function
	448	* has been called by the specific drivers.
	449	*/
f6b98252	450	ret = exynos_drm_fbdev_init(dev);
1c248b7d ID	451	}
1c248b7d ID	452
601b44e3 ID	453	return ret;
601b44e3 ID	454
1c248b7d ID	455	err:
	456	/*
	457	* if drm_load() failed when drm load() was called prior
	458	* to specific drivers, the fb_helper must be NULL and so check it.
	459	*/
	460	if (fb_helper)
	461	drm_fb_helper_fini(fb_helper);
	462
	463	return ret;
	464	}
	465
	466	MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
	467	MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
	468	MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
	469	MODULE_DESCRIPTION("Samsung SoC DRM FBDEV Driver");
	470	MODULE_LICENSE("GPL");