[mirror_ubuntu-bionic-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 "exynos_drm_drv.h"
#include "exynos_drm_fb.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;

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

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

	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_LOG_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 = 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 = 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("%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;
	}

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

	/* 0 means to allocate physically continuous memory */
	exynos_gem_obj = exynos_drm_gem_create(dev, 0, 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_OR_NULL(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 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__);

	/*
	 * with !helper->fb, it means that this funcion is called first time
	 * and after that, the helper->fb would be used as clone mode.
	 */
	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;
	}

	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 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_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_fb_helper_restore_fbdev_mode(private->fb_helper);
}
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>
1c248b7d ID	19
	20	#include "exynos_drm_drv.h"
	21	#include "exynos_drm_fb.h"
2c871127	22	#include "exynos_drm_gem.h"
c704f1b4	23	#include "exynos_drm_iommu.h"
1c248b7d ID	24
	25	#define MAX_CONNECTOR 4
	26	#define PREFERRED_BPP 32
	27
	28	#define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\
	29	drm_fb_helper)
	30
	31	struct exynos_drm_fbdev {
e1533c08 JS	32	struct drm_fb_helper drm_fb_helper;
e1533c08 JS	33	struct exynos_drm_gem_obj *exynos_gem_obj;
1c248b7d ID	34	};
1c248b7d ID	35
dd265850 P	36	static int exynos_drm_fb_mmap(struct fb_info *info,
	37	struct vm_area_struct *vma)
	38	{
	39	struct drm_fb_helper *helper = info->par;
	40	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
	41	struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
	42	struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
	43	unsigned long vm_size;
	44	int ret;
	45
	46	DRM_DEBUG_KMS("%s\n", __func__);
	47
	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 ID	86
	87	DRM_DEBUG_KMS("%s\n", __FILE__);
	88
01f2c773	89	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
aa6b2b6c	90	drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
1c248b7d	91
229d3534 SWK	92	/* RGB formats use only one buffer */
229d3534 SWK	93	buffer = exynos_drm_fb_buffer(fb, 0);
2c871127 ID	94	if (!buffer) {
2c871127 ID	95	DRM_LOG_KMS("buffer is null.\n");
19c8b834 ID	96	return -EFAULT;
19c8b834 ID	97	}
1c248b7d	98
4744ad24 ID	99	/* map pages with kernel virtual space. */
4744ad24 ID	100	if (!buffer->kvaddr) {
c704f1b4 ID	101	if (is_drm_iommu_supported(dev)) {
	102	unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
	103
	104	buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP,
4744ad24	105	pgprot_writecombine(PAGE_KERNEL));
c704f1b4 ID	106	} else {
	107	phys_addr_t dma_addr = buffer->dma_addr;
	108	if (dma_addr)
	109	buffer->kvaddr = phys_to_virt(dma_addr);
	110	else
	111	buffer->kvaddr = (void __iomem *)NULL;
	112	}
4744ad24 ID	113	if (!buffer->kvaddr) {
	114	DRM_ERROR("failed to map pages to kernel space.\n");
	115	return -EIO;
	116	}
	117	}
	118
01ed8126 ID	119	/* buffer count to framebuffer always is 1 at booting time. */
	120	exynos_drm_fb_set_buf_cnt(fb, 1);
	121
19c8b834	122	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
01f2c773	123	offset += fbi->var.yoffset * fb->pitches[0];
1c248b7d	124
2c871127 ID	125	dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
2c871127 ID	126	fbi->screen_base = buffer->kvaddr + offset;
c704f1b4 ID	127	if (is_drm_iommu_supported(dev))
c704f1b4 ID	128	fbi->fix.smem_start = (unsigned long)
640631d0	129	(page_to_phys(sg_page(buffer->sgt->sgl)) + offset);
c704f1b4 ID	130	else
	131	fbi->fix.smem_start = (unsigned long)buffer->dma_addr;
	132
1c248b7d	133	fbi->screen_size = size;
1c248b7d	134	fbi->fix.smem_len = size;
19c8b834 ID	135
19c8b834 ID	136	return 0;
1c248b7d ID	137	}
	138
	139	static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
	140	struct drm_fb_helper_surface_size *sizes)
	141	{
	142	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
e1533c08	143	struct exynos_drm_gem_obj *exynos_gem_obj;
1c248b7d ID	144	struct drm_device *dev = helper->dev;
1c248b7d ID	145	struct fb_info *fbi;
a794d57d	146	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
1c248b7d	147	struct platform_device *pdev = dev->platformdev;
e1533c08	148	unsigned long size;
1c248b7d ID	149	int ret;
	150
	151	DRM_DEBUG_KMS("%s\n", __FILE__);
	152
	153	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
	154	sizes->surface_width, sizes->surface_height,
	155	sizes->surface_bpp);
	156
	157	mode_cmd.width = sizes->surface_width;
	158	mode_cmd.height = sizes->surface_height;
a794d57d JS	159	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
	160	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
	161	sizes->surface_depth);
1c248b7d ID	162
	163	mutex_lock(&dev->struct_mutex);
	164
	165	fbi = framebuffer_alloc(0, &pdev->dev);
	166	if (!fbi) {
	167	DRM_ERROR("failed to allocate fb info.\n");
	168	ret = -ENOMEM;
	169	goto out;
	170	}
	171
e1533c08	172	size = mode_cmd.pitches[0] * mode_cmd.height;
2b35892e ID	173
	174	/* 0 means to allocate physically continuous memory */
	175	exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
e1533c08 JS	176	if (IS_ERR(exynos_gem_obj)) {
e1533c08 JS	177	ret = PTR_ERR(exynos_gem_obj);
662aa6d7	178	goto err_release_framebuffer;
e1533c08 JS	179	}
	180
	181	exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
	182
	183	helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
	184	&exynos_gem_obj->base);
	185	if (IS_ERR_OR_NULL(helper->fb)) {
1c248b7d	186	DRM_ERROR("failed to create drm framebuffer.\n");
e1533c08	187	ret = PTR_ERR(helper->fb);
662aa6d7	188	goto err_destroy_gem;
1c248b7d ID	189	}
1c248b7d ID	190
1c248b7d ID	191	helper->fbdev = fbi;
	192
	193	fbi->par = helper;
	194	fbi->flags = FBINFO_FLAG_DEFAULT;
	195	fbi->fbops = &exynos_drm_fb_ops;
	196
	197	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
	198	if (ret) {
	199	DRM_ERROR("failed to allocate cmap.\n");
662aa6d7	200	goto err_destroy_framebuffer;
1c248b7d ID	201	}
1c248b7d ID	202
aa6b2b6c	203	ret = exynos_drm_fbdev_update(helper, helper->fb);
662aa6d7 ID	204	if (ret < 0)
	205	goto err_dealloc_cmap;
	206
	207	mutex_unlock(&dev->struct_mutex);
	208	return ret;
	209
	210	err_dealloc_cmap:
	211	fb_dealloc_cmap(&fbi->cmap);
	212	err_destroy_framebuffer:
	213	drm_framebuffer_cleanup(helper->fb);
	214	err_destroy_gem:
	215	exynos_drm_gem_destroy(exynos_gem_obj);
	216	err_release_framebuffer:
	217	framebuffer_release(fbi);
1c248b7d ID	218
	219	/*
	220	* if failed, all resources allocated above would be released by
	221	* drm_mode_config_cleanup() when drm_load() had been called prior
	222	* to any specific driver such as fimd or hdmi driver.
	223	*/
	224	out:
	225	mutex_unlock(&dev->struct_mutex);
	226	return ret;
	227	}
	228
1c248b7d ID	229	static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
	230	struct drm_fb_helper_surface_size *sizes)
	231	{
	232	int ret = 0;
	233
	234	DRM_DEBUG_KMS("%s\n", __FILE__);
	235
bc41eae2 ID	236	/*
	237	* with !helper->fb, it means that this funcion is called first time
	238	* and after that, the helper->fb would be used as clone mode.
	239	*/
1c248b7d ID	240	if (!helper->fb) {
	241	ret = exynos_drm_fbdev_create(helper, sizes);
	242	if (ret < 0) {
	243	DRM_ERROR("failed to create fbdev.\n");
	244	return ret;
	245	}
	246
	247	/*
	248	* fb_helper expects a value more than 1 if succeed
	249	* because register_framebuffer() should be called.
	250	*/
	251	ret = 1;
1c248b7d ID	252	}
	253
	254	return ret;
	255	}
	256
	257	static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
	258	.fb_probe = exynos_drm_fbdev_probe,
	259	};
	260
	261	int exynos_drm_fbdev_init(struct drm_device *dev)
	262	{
	263	struct exynos_drm_fbdev *fbdev;
	264	struct exynos_drm_private *private = dev->dev_private;
	265	struct drm_fb_helper *helper;
	266	unsigned int num_crtc;
	267	int ret;
	268
	269	DRM_DEBUG_KMS("%s\n", __FILE__);
	270
	271	if (!dev->mode_config.num_crtc \|\| !dev->mode_config.num_connector)
	272	return 0;
	273
	274	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
	275	if (!fbdev) {
	276	DRM_ERROR("failed to allocate drm fbdev.\n");
	277	return -ENOMEM;
	278	}
	279
	280	private->fb_helper = helper = &fbdev->drm_fb_helper;
	281	helper->funcs = &exynos_drm_fb_helper_funcs;
	282
	283	num_crtc = dev->mode_config.num_crtc;
	284
	285	ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
	286	if (ret < 0) {
	287	DRM_ERROR("failed to initialize drm fb helper.\n");
	288	goto err_init;
	289	}
	290
	291	ret = drm_fb_helper_single_add_all_connectors(helper);
	292	if (ret < 0) {
	293	DRM_ERROR("failed to register drm_fb_helper_connector.\n");
	294	goto err_setup;
	295
	296	}
	297
	298	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
	299	if (ret < 0) {
	300	DRM_ERROR("failed to set up hw configuration.\n");
	301	goto err_setup;
	302	}
	303
	304	return 0;
	305
	306	err_setup:
	307	drm_fb_helper_fini(helper);
	308
	309	err_init:
	310	private->fb_helper = NULL;
	311	kfree(fbdev);
	312
	313	return ret;
	314	}
	315
316	static void exynos_drm_fbdev_destroy(struct drm_device *dev,
317	struct drm_fb_helper *fb_helper)
318	{
4744ad24 ID	319	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
4744ad24 ID	320	struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
1c248b7d ID	321	struct drm_framebuffer *fb;
1c248b7d ID	322
c704f1b4	323	if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr)
4744ad24 ID	324	vunmap(exynos_gem_obj->buffer->kvaddr);
4744ad24 ID	325
1c248b7d ID	326	/* release drm framebuffer and real buffer */
	327	if (fb_helper->fb && fb_helper->fb->funcs) {
	328	fb = fb_helper->fb;
f7eff60e RC	329	if (fb)
f7eff60e RC	330	drm_framebuffer_remove(fb);
1c248b7d ID	331	}
	332
	333	/* release linux framebuffer */
	334	if (fb_helper->fbdev) {
	335	struct fb_info *info;
	336	int ret;
	337
	338	info = fb_helper->fbdev;
	339	ret = unregister_framebuffer(info);
	340	if (ret < 0)
	341	DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
	342
	343	if (info->cmap.len)
	344	fb_dealloc_cmap(&info->cmap);
	345
	346	framebuffer_release(info);
	347	}
	348
	349	drm_fb_helper_fini(fb_helper);
	350	}
	351
	352	void exynos_drm_fbdev_fini(struct drm_device *dev)
	353	{
	354	struct exynos_drm_private *private = dev->dev_private;
	355	struct exynos_drm_fbdev *fbdev;
	356
	357	if (!private \|\| !private->fb_helper)
	358	return;
	359
	360	fbdev = to_exynos_fbdev(private->fb_helper);
	361
e1533c08 JS	362	if (fbdev->exynos_gem_obj)
	363	exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
	364
1c248b7d ID	365	exynos_drm_fbdev_destroy(dev, private->fb_helper);
	366	kfree(fbdev);
	367	private->fb_helper = NULL;
	368	}
	369
	370	void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
	371	{
	372	struct exynos_drm_private *private = dev->dev_private;
	373
	374	if (!private \|\| !private->fb_helper)
	375	return;
	376
	377	drm_fb_helper_restore_fbdev_mode(private->fb_helper);
	378	}