[mirror_ubuntu-hirsute-kernel.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>
 *
 * 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.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/exynos_drm.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_fb.h"
#include "exynos_drm_fbdev.h"
#include "exynos_drm_gem.h"
#include "exynos_drm_iommu.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 exynos_drm_gem_obj	*exynos_gem_obj;
};

static int exynos_drm_fb_mmap(struct fb_info *info,
			struct vm_area_struct *vma)
{
	struct drm_fb_helper *helper = info->par;
	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
	struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
	struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
	unsigned long vm_size;
	int ret;

	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;

	vm_size = vma->vm_end - vma->vm_start;

	if (vm_size > buffer->size)
		return -EINVAL;

	ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages,
		buffer->dma_addr, buffer->size, &buffer->dma_attrs);
	if (ret < 0) {
		DRM_ERROR("failed to mmap.\n");
		return ret;
	}

	return 0;
}

static struct fb_ops exynos_drm_fb_ops = {
	.owner		= THIS_MODULE,
	.fb_mmap        = exynos_drm_fb_mmap,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
	.fb_check_var	= drm_fb_helper_check_var,
	.fb_set_par	= drm_fb_helper_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_gem_buf *buffer;
	unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
	unsigned long offset;

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

	/* RGB formats use only one buffer */
	buffer = exynos_drm_fb_buffer(fb, 0);
	if (!buffer) {
		DRM_DEBUG_KMS("buffer is null.\n");
		return -EFAULT;
	}

	/* map pages with kernel virtual space. */
	if (!buffer->kvaddr) {
		if (is_drm_iommu_supported(dev)) {
			unsigned int nr_pages = buffer->size >> PAGE_SHIFT;

			buffer->kvaddr = (void __iomem *) vmap(buffer->pages,
					nr_pages, VM_MAP,
					pgprot_writecombine(PAGE_KERNEL));
		} else {
			phys_addr_t dma_addr = buffer->dma_addr;
			if (dma_addr)
				buffer->kvaddr = (void __iomem *)phys_to_virt(dma_addr);
			else
				buffer->kvaddr = (void __iomem *)NULL;
		}
		if (!buffer->kvaddr) {
			DRM_ERROR("failed to map pages to kernel space.\n");
			return -EIO;
		}
	}

	/* buffer count to framebuffer always is 1 at booting time. */
	exynos_drm_fb_set_buf_cnt(fb, 1);

	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;
	if (is_drm_iommu_supported(dev))
		fbi->fix.smem_start = (unsigned long)
			(page_to_phys(sg_page(buffer->sgt->sgl)) + offset);
	else
		fbi->fix.smem_start = (unsigned long)buffer->dma_addr;

	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 exynos_drm_gem_obj *exynos_gem_obj;
	struct drm_device *dev = helper->dev;
	struct fb_info *fbi;
	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
	struct platform_device *pdev = dev->platformdev;
	unsigned long size;
	int ret;

	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;
	}

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

	exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
	/*
	 * If physically contiguous memory allocation fails and if IOMMU is
	 * supported then try to get buffer from non physically contiguous
	 * memory area.
	 */
	if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
		dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
		exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
							size);
	}

	if (IS_ERR(exynos_gem_obj)) {
		ret = PTR_ERR(exynos_gem_obj);
		goto err_release_framebuffer;
	}

	exynos_fbdev->exynos_gem_obj = exynos_gem_obj;

	helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
			&exynos_gem_obj->base);
	if (IS_ERR(helper->fb)) {
		DRM_ERROR("failed to create drm framebuffer.\n");
		ret = PTR_ERR(helper->fb);
		goto err_destroy_gem;
	}

	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 err_destroy_framebuffer;
	}

	ret = exynos_drm_fbdev_update(helper, helper->fb);
	if (ret < 0)
		goto err_dealloc_cmap;

	mutex_unlock(&dev->struct_mutex);
	return ret;

err_dealloc_cmap:
	fb_dealloc_cmap(&fbi->cmap);
err_destroy_framebuffer:
	drm_framebuffer_cleanup(helper->fb);
err_destroy_gem:
	exynos_drm_gem_destroy(exynos_gem_obj);
err_release_framebuffer:
	framebuffer_release(fbi);

/*
 * 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 struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
	.fb_probe =	exynos_drm_fbdev_create,
};

bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
{
	struct drm_connector *connector;
	bool ret = false;

	mutex_lock(&dev->mode_config.mutex);
	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
		if (connector->status != connector_status_connected)
			continue;

		ret = true;
		break;
	}
	mutex_unlock(&dev->mode_config.mutex);

	return ret;
}

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;

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

	if (!exynos_drm_fbdev_is_anything_connected(dev))
		return 0;

	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
	if (!fbdev)
		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;

	}

	/* disable all the possible outputs/crtcs before entering KMS mode */
	drm_helper_disable_unused_functions(dev);

	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 exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
	struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
	struct drm_framebuffer *fb;

	if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr)
		vunmap(exynos_gem_obj->buffer->kvaddr);

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

	if (fbdev->exynos_gem_obj)
		exynos_drm_gem_destroy(fbdev->exynos_gem_obj);

	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_modeset_lock_all(dev);
	drm_fb_helper_restore_fbdev_mode(private->fb_helper);
	drm_modeset_unlock_all(dev);
}
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	*
d81aecb5 ID	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the
	11	* Free Software Foundation; either version 2 of the License, or (at your
	12	* option) any later version.
1c248b7d ID	13	*/
1c248b7d ID	14
760285e7 DH	15	#include <drm/drmP.h>
	16	#include <drm/drm_crtc.h>
	17	#include <drm/drm_fb_helper.h>
	18	#include <drm/drm_crtc_helper.h>
a1bfacf4	19	#include <drm/exynos_drm.h>
1c248b7d ID	20
	21	#include "exynos_drm_drv.h"
	22	#include "exynos_drm_fb.h"
e30655d0	23	#include "exynos_drm_fbdev.h"
2c871127	24	#include "exynos_drm_gem.h"
c704f1b4	25	#include "exynos_drm_iommu.h"
1c248b7d ID	26
	27	#define MAX_CONNECTOR 4
	28	#define PREFERRED_BPP 32
	29
	30	#define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\
	31	drm_fb_helper)
	32
	33	struct exynos_drm_fbdev {
e1533c08 JS	34	struct drm_fb_helper drm_fb_helper;
e1533c08 JS	35	struct exynos_drm_gem_obj *exynos_gem_obj;
1c248b7d ID	36	};
1c248b7d ID	37
dd265850 P	38	static int exynos_drm_fb_mmap(struct fb_info *info,
	39	struct vm_area_struct *vma)
	40	{
	41	struct drm_fb_helper *helper = info->par;
	42	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
	43	struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
	44	struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
	45	unsigned long vm_size;
	46	int ret;
	47
dd265850 P	48	vma->vm_flags \|= VM_IO \| VM_DONTEXPAND \| VM_DONTDUMP;
	49
	50	vm_size = vma->vm_end - vma->vm_start;
	51
	52	if (vm_size > buffer->size)
	53	return -EINVAL;
	54
4744ad24	55	ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages,
dd265850 P	56	buffer->dma_addr, buffer->size, &buffer->dma_attrs);
	57	if (ret < 0) {
	58	DRM_ERROR("failed to mmap.\n");
	59	return ret;
	60	}
	61
	62	return 0;
	63	}
	64
1c248b7d ID	65	static struct fb_ops exynos_drm_fb_ops = {
1c248b7d ID	66	.owner = THIS_MODULE,
dd265850	67	.fb_mmap = exynos_drm_fb_mmap,
1c248b7d ID	68	.fb_fillrect = cfb_fillrect,
	69	.fb_copyarea = cfb_copyarea,
	70	.fb_imageblit = cfb_imageblit,
	71	.fb_check_var = drm_fb_helper_check_var,
83b316fd	72	.fb_set_par = drm_fb_helper_set_par,
1c248b7d ID	73	.fb_blank = drm_fb_helper_blank,
	74	.fb_pan_display = drm_fb_helper_pan_display,
	75	.fb_setcmap = drm_fb_helper_setcmap,
	76	};
	77
19c8b834	78	static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
aa6b2b6c	79	struct drm_framebuffer *fb)
1c248b7d ID	80	{
	81	struct fb_info *fbi = helper->fbdev;
	82	struct drm_device *dev = helper->dev;
2c871127	83	struct exynos_drm_gem_buf *buffer;
aa6b2b6c	84	unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
19c8b834	85	unsigned long offset;
1c248b7d	86
01f2c773	87	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
aa6b2b6c	88	drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
1c248b7d	89
229d3534 SWK	90	/* RGB formats use only one buffer */
229d3534 SWK	91	buffer = exynos_drm_fb_buffer(fb, 0);
2c871127	92	if (!buffer) {
133dcdeb	93	DRM_DEBUG_KMS("buffer is null.\n");
19c8b834 ID	94	return -EFAULT;
19c8b834 ID	95	}
1c248b7d	96
4744ad24 ID	97	/* map pages with kernel virtual space. */
4744ad24 ID	98	if (!buffer->kvaddr) {
c704f1b4 ID	99	if (is_drm_iommu_supported(dev)) {
	100	unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
	101
fafb3837 SK	102	buffer->kvaddr = (void __iomem *) vmap(buffer->pages,
fafb3837 SK	103	nr_pages, VM_MAP,
4744ad24	104	pgprot_writecombine(PAGE_KERNEL));
c704f1b4 ID	105	} else {
	106	phys_addr_t dma_addr = buffer->dma_addr;
	107	if (dma_addr)
fafb3837	108	buffer->kvaddr = (void __iomem *)phys_to_virt(dma_addr);
c704f1b4 ID	109	else
	110	buffer->kvaddr = (void __iomem *)NULL;
	111	}
4744ad24 ID	112	if (!buffer->kvaddr) {
	113	DRM_ERROR("failed to map pages to kernel space.\n");
	114	return -EIO;
	115	}
	116	}
	117
01ed8126 ID	118	/* buffer count to framebuffer always is 1 at booting time. */
	119	exynos_drm_fb_set_buf_cnt(fb, 1);
	120
19c8b834	121	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
01f2c773	122	offset += fbi->var.yoffset * fb->pitches[0];
1c248b7d	123
2c871127 ID	124	dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
2c871127 ID	125	fbi->screen_base = buffer->kvaddr + offset;
c704f1b4 ID	126	if (is_drm_iommu_supported(dev))
c704f1b4 ID	127	fbi->fix.smem_start = (unsigned long)
640631d0	128	(page_to_phys(sg_page(buffer->sgt->sgl)) + offset);
c704f1b4 ID	129	else
	130	fbi->fix.smem_start = (unsigned long)buffer->dma_addr;
	131
1c248b7d	132	fbi->screen_size = size;
1c248b7d	133	fbi->fix.smem_len = size;
19c8b834 ID	134
19c8b834 ID	135	return 0;
1c248b7d ID	136	}
	137
	138	static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
	139	struct drm_fb_helper_surface_size *sizes)
	140	{
	141	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
e1533c08	142	struct exynos_drm_gem_obj *exynos_gem_obj;
1c248b7d ID	143	struct drm_device *dev = helper->dev;
1c248b7d ID	144	struct fb_info *fbi;
a794d57d	145	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
1c248b7d	146	struct platform_device *pdev = dev->platformdev;
e1533c08	147	unsigned long size;
1c248b7d ID	148	int ret;
1c248b7d ID	149
1c248b7d ID	150	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
	151	sizes->surface_width, sizes->surface_height,
	152	sizes->surface_bpp);
	153
	154	mode_cmd.width = sizes->surface_width;
	155	mode_cmd.height = sizes->surface_height;
a794d57d JS	156	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
	157	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
	158	sizes->surface_depth);
1c248b7d ID	159
	160	mutex_lock(&dev->struct_mutex);
	161
	162	fbi = framebuffer_alloc(0, &pdev->dev);
	163	if (!fbi) {
	164	DRM_ERROR("failed to allocate fb info.\n");
	165	ret = -ENOMEM;
	166	goto out;
	167	}
	168
e1533c08	169	size = mode_cmd.pitches[0] * mode_cmd.height;
2b35892e	170
a1bfacf4 VS	171	exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
	172	/*
	173	* If physically contiguous memory allocation fails and if IOMMU is
	174	* supported then try to get buffer from non physically contiguous
	175	* memory area.
	176	*/
	177	if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
	178	dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
	179	exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
	180	size);
	181	}
	182
e1533c08 JS	183	if (IS_ERR(exynos_gem_obj)) {
e1533c08 JS	184	ret = PTR_ERR(exynos_gem_obj);
662aa6d7	185	goto err_release_framebuffer;
e1533c08 JS	186	}
	187
	188	exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
	189
	190	helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
	191	&exynos_gem_obj->base);
41eab402	192	if (IS_ERR(helper->fb)) {
1c248b7d	193	DRM_ERROR("failed to create drm framebuffer.\n");
e1533c08	194	ret = PTR_ERR(helper->fb);
662aa6d7	195	goto err_destroy_gem;
1c248b7d ID	196	}
1c248b7d ID	197
1c248b7d ID	198	helper->fbdev = fbi;
	199
	200	fbi->par = helper;
	201	fbi->flags = FBINFO_FLAG_DEFAULT;
	202	fbi->fbops = &exynos_drm_fb_ops;
	203
	204	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
	205	if (ret) {
	206	DRM_ERROR("failed to allocate cmap.\n");
662aa6d7	207	goto err_destroy_framebuffer;
1c248b7d ID	208	}
1c248b7d ID	209
aa6b2b6c	210	ret = exynos_drm_fbdev_update(helper, helper->fb);
662aa6d7 ID	211	if (ret < 0)
	212	goto err_dealloc_cmap;
	213
	214	mutex_unlock(&dev->struct_mutex);
	215	return ret;
	216
	217	err_dealloc_cmap:
	218	fb_dealloc_cmap(&fbi->cmap);
	219	err_destroy_framebuffer:
	220	drm_framebuffer_cleanup(helper->fb);
	221	err_destroy_gem:
	222	exynos_drm_gem_destroy(exynos_gem_obj);
	223	err_release_framebuffer:
	224	framebuffer_release(fbi);
1c248b7d ID	225
	226	/*
	227	* if failed, all resources allocated above would be released by
	228	* drm_mode_config_cleanup() when drm_load() had been called prior
	229	* to any specific driver such as fimd or hdmi driver.
	230	*/
	231	out:
	232	mutex_unlock(&dev->struct_mutex);
	233	return ret;
	234	}
	235
1c248b7d	236	static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
cd5428a5	237	.fb_probe = exynos_drm_fbdev_create,
1c248b7d ID	238	};
1c248b7d ID	239
3eb578e2 AH	240	bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
	241	{
	242	struct drm_connector *connector;
	243	bool ret = false;
	244
	245	mutex_lock(&dev->mode_config.mutex);
	246	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
	247	if (connector->status != connector_status_connected)
	248	continue;
	249
	250	ret = true;
	251	break;
	252	}
	253	mutex_unlock(&dev->mode_config.mutex);
	254
	255	return ret;
	256	}
	257
1c248b7d ID	258	int exynos_drm_fbdev_init(struct drm_device *dev)
	259	{
	260	struct exynos_drm_fbdev *fbdev;
	261	struct exynos_drm_private *private = dev->dev_private;
	262	struct drm_fb_helper *helper;
	263	unsigned int num_crtc;
	264	int ret;
	265
1c248b7d ID	266	if (!dev->mode_config.num_crtc \|\| !dev->mode_config.num_connector)
	267	return 0;
	268
3eb578e2 AH	269	if (!exynos_drm_fbdev_is_anything_connected(dev))
	270	return 0;
	271
1c248b7d	272	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
38bb5253	273	if (!fbdev)
1c248b7d	274	return -ENOMEM;
1c248b7d ID	275
	276	private->fb_helper = helper = &fbdev->drm_fb_helper;
	277	helper->funcs = &exynos_drm_fb_helper_funcs;
	278
	279	num_crtc = dev->mode_config.num_crtc;
	280
	281	ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
	282	if (ret < 0) {
	283	DRM_ERROR("failed to initialize drm fb helper.\n");
	284	goto err_init;
	285	}
	286
	287	ret = drm_fb_helper_single_add_all_connectors(helper);
	288	if (ret < 0) {
	289	DRM_ERROR("failed to register drm_fb_helper_connector.\n");
	290	goto err_setup;
	291
	292	}
	293
76a39dbf DV	294	/* disable all the possible outputs/crtcs before entering KMS mode */
	295	drm_helper_disable_unused_functions(dev);
	296
1c248b7d ID	297	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
	298	if (ret < 0) {
	299	DRM_ERROR("failed to set up hw configuration.\n");
	300	goto err_setup;
	301	}
	302
	303	return 0;
	304
	305	err_setup:
	306	drm_fb_helper_fini(helper);
	307
	308	err_init:
	309	private->fb_helper = NULL;
	310	kfree(fbdev);
	311
	312	return ret;
	313	}
	314
	315	static void exynos_drm_fbdev_destroy(struct drm_device *dev,
	316	struct drm_fb_helper *fb_helper)
	317	{
4744ad24 ID	318	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
4744ad24 ID	319	struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
1c248b7d ID	320	struct drm_framebuffer *fb;
1c248b7d ID	321
c704f1b4	322	if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr)
4744ad24 ID	323	vunmap(exynos_gem_obj->buffer->kvaddr);
4744ad24 ID	324
1c248b7d ID	325	/* release drm framebuffer and real buffer */
	326	if (fb_helper->fb && fb_helper->fb->funcs) {
	327	fb = fb_helper->fb;
36206361 DV	328	if (fb) {
36206361 DV	329	drm_framebuffer_unregister_private(fb);
f7eff60e	330	drm_framebuffer_remove(fb);
36206361	331	}
1c248b7d ID	332	}
	333
	334	/* release linux framebuffer */
	335	if (fb_helper->fbdev) {
	336	struct fb_info *info;
	337	int ret;
	338
	339	info = fb_helper->fbdev;
	340	ret = unregister_framebuffer(info);
	341	if (ret < 0)
	342	DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
	343
	344	if (info->cmap.len)
	345	fb_dealloc_cmap(&info->cmap);
	346
	347	framebuffer_release(info);
	348	}
	349
	350	drm_fb_helper_fini(fb_helper);
	351	}
	352
	353	void exynos_drm_fbdev_fini(struct drm_device *dev)
	354	{
	355	struct exynos_drm_private *private = dev->dev_private;
	356	struct exynos_drm_fbdev *fbdev;
	357
	358	if (!private \|\| !private->fb_helper)
	359	return;
	360
	361	fbdev = to_exynos_fbdev(private->fb_helper);
	362
e1533c08 JS	363	if (fbdev->exynos_gem_obj)
	364	exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
	365
1c248b7d ID	366	exynos_drm_fbdev_destroy(dev, private->fb_helper);
	367	kfree(fbdev);
	368	private->fb_helper = NULL;
	369	}
	370
	371	void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
	372	{
	373	struct exynos_drm_private *private = dev->dev_private;
	374
	375	if (!private \|\| !private->fb_helper)
	376	return;
	377
6aed8ec3	378	drm_modeset_lock_all(dev);
1c248b7d	379	drm_fb_helper_restore_fbdev_mode(private->fb_helper);
6aed8ec3	380	drm_modeset_unlock_all(dev);
1c248b7d	381	}