[deliverable/linux.git] / drivers / gpu / drm / drm_fb_cma_helper.c

/*
 * drm kms/fb cma (contiguous memory allocator) helper functions
 *
 * Copyright (C) 2012 Analog Device Inc.
 *   Author: Lars-Peter Clausen <lars@metafoo.de>
 *
 * Based on udl_fbdev.c
 *  Copyright (C) 2012 Red Hat
 *
 * 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.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <linux/module.h>

struct drm_fb_cma {
	struct drm_framebuffer		fb;
	struct drm_gem_cma_object	*obj[4];
};

struct drm_fbdev_cma {
	struct drm_fb_helper	fb_helper;
	struct drm_fb_cma	*fb;
};

static inline struct drm_fbdev_cma *to_fbdev_cma(struct drm_fb_helper *helper)
{
	return container_of(helper, struct drm_fbdev_cma, fb_helper);
}

static inline struct drm_fb_cma *to_fb_cma(struct drm_framebuffer *fb)
{
	return container_of(fb, struct drm_fb_cma, fb);
}

static void drm_fb_cma_destroy(struct drm_framebuffer *fb)
{
	struct drm_fb_cma *fb_cma = to_fb_cma(fb);
	int i;

	for (i = 0; i < 4; i++) {
		if (fb_cma->obj[i])
			drm_gem_object_unreference_unlocked(&fb_cma->obj[i]->base);
	}

	drm_framebuffer_cleanup(fb);
	kfree(fb_cma);
}

static int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
	struct drm_file *file_priv, unsigned int *handle)
{
	struct drm_fb_cma *fb_cma = to_fb_cma(fb);

	return drm_gem_handle_create(file_priv,
			&fb_cma->obj[0]->base, handle);
}

static struct drm_framebuffer_funcs drm_fb_cma_funcs = {
	.destroy	= drm_fb_cma_destroy,
	.create_handle	= drm_fb_cma_create_handle,
};

static struct drm_fb_cma *drm_fb_cma_alloc(struct drm_device *dev,
	const const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_cma_object **obj,
	unsigned int num_planes)
{
	struct drm_fb_cma *fb_cma;
	int ret;
	int i;

	fb_cma = kzalloc(sizeof(*fb_cma), GFP_KERNEL);
	if (!fb_cma)
		return ERR_PTR(-ENOMEM);

	drm_helper_mode_fill_fb_struct(&fb_cma->fb, mode_cmd);

	for (i = 0; i < num_planes; i++)
		fb_cma->obj[i] = obj[i];

	ret = drm_framebuffer_init(dev, &fb_cma->fb, &drm_fb_cma_funcs);
	if (ret) {
		dev_err(dev->dev, "Failed to initialize framebuffer: %d\n", ret);
		kfree(fb_cma);
		return ERR_PTR(ret);
	}

	return fb_cma;
}

/**
 * drm_fb_cma_create() - (struct drm_mode_config_funcs *)->fb_create callback function
 *
 * If your hardware has special alignment or pitch requirements these should be
 * checked before calling this function.
 */
struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
	struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct drm_fb_cma *fb_cma;
	struct drm_gem_cma_object *objs[4];
	struct drm_gem_object *obj;
	unsigned int hsub;
	unsigned int vsub;
	int ret;
	int i;

	hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
	vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);

	for (i = 0; i < drm_format_num_planes(mode_cmd->pixel_format); i++) {
		unsigned int width = mode_cmd->width / (i ? hsub : 1);
		unsigned int height = mode_cmd->height / (i ? vsub : 1);
		unsigned int min_size;

		obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[i]);
		if (!obj) {
			dev_err(dev->dev, "Failed to lookup GEM object\n");
			ret = -ENXIO;
			goto err_gem_object_unreference;
		}

		min_size = (height - 1) * mode_cmd->pitches[i]
			 + width * drm_format_plane_cpp(mode_cmd->pixel_format, i)
			 + mode_cmd->offsets[i];

		if (obj->size < min_size) {
			drm_gem_object_unreference_unlocked(obj);
			ret = -EINVAL;
			goto err_gem_object_unreference;
		}
		objs[i] = to_drm_gem_cma_obj(obj);
	}

	fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i);
	if (IS_ERR(fb_cma)) {
		ret = PTR_ERR(fb_cma);
		goto err_gem_object_unreference;
	}

	return &fb_cma->fb;

err_gem_object_unreference:
	for (i--; i >= 0; i--)
		drm_gem_object_unreference_unlocked(&objs[i]->base);
	return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(drm_fb_cma_create);

/**
 * drm_fb_cma_get_gem_obj() - Get CMA GEM object for framebuffer
 * @fb: The framebuffer
 * @plane: Which plane
 *
 * Return the CMA GEM object for given framebuffer.
 *
 * This function will usually be called from the CRTC callback functions.
 */
struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
	unsigned int plane)
{
	struct drm_fb_cma *fb_cma = to_fb_cma(fb);

	if (plane >= 4)
		return NULL;

	return fb_cma->obj[plane];
}
EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);

#ifdef CONFIG_DEBUG_FS
/*
 * drm_fb_cma_describe() - Helper to dump information about a single
 * CMA framebuffer object
 */
static void drm_fb_cma_describe(struct drm_framebuffer *fb, struct seq_file *m)
{
	struct drm_fb_cma *fb_cma = to_fb_cma(fb);
	int i, n = drm_format_num_planes(fb->pixel_format);

	seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
			(char *)&fb->pixel_format);

	for (i = 0; i < n; i++) {
		seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
				i, fb->offsets[i], fb->pitches[i]);
		drm_gem_cma_describe(fb_cma->obj[i], m);
	}
}

/**
 * drm_fb_cma_debugfs_show() - Helper to list CMA framebuffer objects
 * in debugfs.
 */
int drm_fb_cma_debugfs_show(struct seq_file *m, void *arg)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	struct drm_framebuffer *fb;

	mutex_lock(&dev->mode_config.fb_lock);
	drm_for_each_fb(fb, dev)
		drm_fb_cma_describe(fb, m);
	mutex_unlock(&dev->mode_config.fb_lock);

	return 0;
}
EXPORT_SYMBOL_GPL(drm_fb_cma_debugfs_show);
#endif

static struct fb_ops drm_fbdev_cma_ops = {
	.owner		= THIS_MODULE,
	.fb_fillrect	= drm_fb_helper_sys_fillrect,
	.fb_copyarea	= drm_fb_helper_sys_copyarea,
	.fb_imageblit	= drm_fb_helper_sys_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 drm_fbdev_cma_create(struct drm_fb_helper *helper,
	struct drm_fb_helper_surface_size *sizes)
{
	struct drm_fbdev_cma *fbdev_cma = to_fbdev_cma(helper);
	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
	struct drm_device *dev = helper->dev;
	struct drm_gem_cma_object *obj;
	struct drm_framebuffer *fb;
	unsigned int bytes_per_pixel;
	unsigned long offset;
	struct fb_info *fbi;
	size_t size;
	int ret;

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

	bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);

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

	size = mode_cmd.pitches[0] * mode_cmd.height;
	obj = drm_gem_cma_create(dev, size);
	if (IS_ERR(obj))
		return -ENOMEM;

	fbi = drm_fb_helper_alloc_fbi(helper);
	if (IS_ERR(fbi)) {
		ret = PTR_ERR(fbi);
		goto err_gem_free_object;
	}

	fbdev_cma->fb = drm_fb_cma_alloc(dev, &mode_cmd, &obj, 1);
	if (IS_ERR(fbdev_cma->fb)) {
		dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
		ret = PTR_ERR(fbdev_cma->fb);
		goto err_fb_info_destroy;
	}

	fb = &fbdev_cma->fb->fb;
	helper->fb = fb;

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

	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
	drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);

	offset = fbi->var.xoffset * bytes_per_pixel;
	offset += fbi->var.yoffset * fb->pitches[0];

	dev->mode_config.fb_base = (resource_size_t)obj->paddr;
	fbi->screen_base = obj->vaddr + offset;
	fbi->fix.smem_start = (unsigned long)(obj->paddr + offset);
	fbi->screen_size = size;
	fbi->fix.smem_len = size;

	return 0;

err_fb_info_destroy:
	drm_fb_helper_release_fbi(helper);
err_gem_free_object:
	dev->driver->gem_free_object(&obj->base);
	return ret;
}

static const struct drm_fb_helper_funcs drm_fb_cma_helper_funcs = {
	.fb_probe = drm_fbdev_cma_create,
};

/**
 * drm_fbdev_cma_init() - Allocate and initializes a drm_fbdev_cma struct
 * @dev: DRM device
 * @preferred_bpp: Preferred bits per pixel for the device
 * @num_crtc: Number of CRTCs
 * @max_conn_count: Maximum number of connectors
 *
 * Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR.
 */
struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
	unsigned int preferred_bpp, unsigned int num_crtc,
	unsigned int max_conn_count)
{
	struct drm_fbdev_cma *fbdev_cma;
	struct drm_fb_helper *helper;
	int ret;

	fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL);
	if (!fbdev_cma) {
		dev_err(dev->dev, "Failed to allocate drm fbdev.\n");
		return ERR_PTR(-ENOMEM);
	}

	helper = &fbdev_cma->fb_helper;

	drm_fb_helper_prepare(dev, helper, &drm_fb_cma_helper_funcs);

	ret = drm_fb_helper_init(dev, helper, num_crtc, max_conn_count);
	if (ret < 0) {
		dev_err(dev->dev, "Failed to initialize drm fb helper.\n");
		goto err_free;
	}

	ret = drm_fb_helper_single_add_all_connectors(helper);
	if (ret < 0) {
		dev_err(dev->dev, "Failed to add connectors.\n");
		goto err_drm_fb_helper_fini;

	}

	ret = drm_fb_helper_initial_config(helper, preferred_bpp);
	if (ret < 0) {
		dev_err(dev->dev, "Failed to set initial hw configuration.\n");
		goto err_drm_fb_helper_fini;
	}

	return fbdev_cma;

err_drm_fb_helper_fini:
	drm_fb_helper_fini(helper);
err_free:
	kfree(fbdev_cma);

	return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(drm_fbdev_cma_init);

/**
 * drm_fbdev_cma_fini() - Free drm_fbdev_cma struct
 * @fbdev_cma: The drm_fbdev_cma struct
 */
void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma)
{
	drm_fb_helper_unregister_fbi(&fbdev_cma->fb_helper);
	drm_fb_helper_release_fbi(&fbdev_cma->fb_helper);

	if (fbdev_cma->fb) {
		drm_framebuffer_unregister_private(&fbdev_cma->fb->fb);
		drm_fb_cma_destroy(&fbdev_cma->fb->fb);
	}

	drm_fb_helper_fini(&fbdev_cma->fb_helper);
	kfree(fbdev_cma);
}
EXPORT_SYMBOL_GPL(drm_fbdev_cma_fini);

/**
 * drm_fbdev_cma_restore_mode() - Restores initial framebuffer mode
 * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
 *
 * This function is usually called from the DRM drivers lastclose callback.
 */
void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_cma)
{
	if (fbdev_cma)
		drm_fb_helper_restore_fbdev_mode_unlocked(&fbdev_cma->fb_helper);
}
EXPORT_SYMBOL_GPL(drm_fbdev_cma_restore_mode);

/**
 * drm_fbdev_cma_hotplug_event() - Poll for hotpulug events
 * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
 *
 * This function is usually called from the DRM drivers output_poll_changed
 * callback.
 */
void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma)
{
	if (fbdev_cma)
		drm_fb_helper_hotplug_event(&fbdev_cma->fb_helper);
}
EXPORT_SYMBOL_GPL(drm_fbdev_cma_hotplug_event);
Commit	Line	Data
2e3b3c42 LPC	1	/*
	2	* drm kms/fb cma (contiguous memory allocator) helper functions
	3	*
	4	* Copyright (C) 2012 Analog Device Inc.
	5	* Author: Lars-Peter Clausen <lars@metafoo.de>
	6	*
	7	* Based on udl_fbdev.c
	8	* Copyright (C) 2012 Red Hat
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version 2
	13	* of the License, or (at your option) any later version.
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*/
	19
	20	#include <drm/drmP.h>
	21	#include <drm/drm_crtc.h>
	22	#include <drm/drm_fb_helper.h>
	23	#include <drm/drm_crtc_helper.h>
	24	#include <drm/drm_gem_cma_helper.h>
	25	#include <drm/drm_fb_cma_helper.h>
	26	#include <linux/module.h>
	27
	28	struct drm_fb_cma {
	29	struct drm_framebuffer fb;
	30	struct drm_gem_cma_object *obj[4];
	31	};
	32
	33	struct drm_fbdev_cma {
	34	struct drm_fb_helper fb_helper;
	35	struct drm_fb_cma *fb;
	36	};
	37
	38	static inline struct drm_fbdev_cma to_fbdev_cma(struct drm_fb_helper helper)
	39	{
	40	return container_of(helper, struct drm_fbdev_cma, fb_helper);
	41	}
	42
	43	static inline struct drm_fb_cma to_fb_cma(struct drm_framebuffer fb)
	44	{
	45	return container_of(fb, struct drm_fb_cma, fb);
	46	}
	47
	48	static void drm_fb_cma_destroy(struct drm_framebuffer *fb)
	49	{
	50	struct drm_fb_cma *fb_cma = to_fb_cma(fb);
	51	int i;
	52
	53	for (i = 0; i < 4; i++) {
	54	if (fb_cma->obj[i])
	55	drm_gem_object_unreference_unlocked(&fb_cma->obj[i]->base);
	56	}
	57
	58	drm_framebuffer_cleanup(fb);
	59	kfree(fb_cma);
	60	}
	61
	62	static int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
	63	struct drm_file file_priv, unsigned int handle)
	64	{
65	struct drm_fb_cma *fb_cma = to_fb_cma(fb);
66
67	return drm_gem_handle_create(file_priv,
68	&fb_cma->obj[0]->base, handle);
69	}
70
71	static struct drm_framebuffer_funcs drm_fb_cma_funcs = {
72	.destroy = drm_fb_cma_destroy,
73	.create_handle = drm_fb_cma_create_handle,
74	};
75
76	static struct drm_fb_cma drm_fb_cma_alloc(struct drm_device dev,
1eb83451	77	const const struct drm_mode_fb_cmd2 mode_cmd, struct drm_gem_cma_object *obj,
2e3b3c42 LPC	78	unsigned int num_planes)
	79	{
	80	struct drm_fb_cma *fb_cma;
	81	int ret;
	82	int i;
	83
	84	fb_cma = kzalloc(sizeof(*fb_cma), GFP_KERNEL);
	85	if (!fb_cma)
	86	return ERR_PTR(-ENOMEM);
	87
c7d73f6a DV	88	drm_helper_mode_fill_fb_struct(&fb_cma->fb, mode_cmd);
	89
	90	for (i = 0; i < num_planes; i++)
	91	fb_cma->obj[i] = obj[i];
	92
2e3b3c42 LPC	93	ret = drm_framebuffer_init(dev, &fb_cma->fb, &drm_fb_cma_funcs);
2e3b3c42 LPC	94	if (ret) {
8b513d0c	95	dev_err(dev->dev, "Failed to initialize framebuffer: %d\n", ret);
2e3b3c42 LPC	96	kfree(fb_cma);
	97	return ERR_PTR(ret);
	98	}
	99
2e3b3c42 LPC	100	return fb_cma;
	101	}
	102
	103	/**
	104	* drm_fb_cma_create() - (struct drm_mode_config_funcs *)->fb_create callback function
	105	*
	106	* If your hardware has special alignment or pitch requirements these should be
	107	* checked before calling this function.
	108	*/
	109	struct drm_framebuffer drm_fb_cma_create(struct drm_device dev,
1eb83451	110	struct drm_file file_priv, const struct drm_mode_fb_cmd2 mode_cmd)
2e3b3c42 LPC	111	{
	112	struct drm_fb_cma *fb_cma;
	113	struct drm_gem_cma_object *objs[4];
	114	struct drm_gem_object *obj;
	115	unsigned int hsub;
	116	unsigned int vsub;
	117	int ret;
	118	int i;
	119
	120	hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
	121	vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
	122
	123	for (i = 0; i < drm_format_num_planes(mode_cmd->pixel_format); i++) {
	124	unsigned int width = mode_cmd->width / (i ? hsub : 1);
	125	unsigned int height = mode_cmd->height / (i ? vsub : 1);
	126	unsigned int min_size;
	127
	128	obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[i]);
	129	if (!obj) {
	130	dev_err(dev->dev, "Failed to lookup GEM object\n");
	131	ret = -ENXIO;
	132	goto err_gem_object_unreference;
	133	}
	134
	135	min_size = (height - 1) * mode_cmd->pitches[i]
	136	+ width * drm_format_plane_cpp(mode_cmd->pixel_format, i)
	137	+ mode_cmd->offsets[i];
	138
	139	if (obj->size < min_size) {
	140	drm_gem_object_unreference_unlocked(obj);
	141	ret = -EINVAL;
	142	goto err_gem_object_unreference;
	143	}
	144	objs[i] = to_drm_gem_cma_obj(obj);
	145	}
	146
	147	fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i);
	148	if (IS_ERR(fb_cma)) {
	149	ret = PTR_ERR(fb_cma);
	150	goto err_gem_object_unreference;
	151	}
	152
	153	return &fb_cma->fb;
	154
	155	err_gem_object_unreference:
	156	for (i--; i >= 0; i--)
	157	drm_gem_object_unreference_unlocked(&objs[i]->base);
	158	return ERR_PTR(ret);
	159	}
	160	EXPORT_SYMBOL_GPL(drm_fb_cma_create);
	161
	162	/**
	163	* drm_fb_cma_get_gem_obj() - Get CMA GEM object for framebuffer
	164	* @fb: The framebuffer
	165	* @plane: Which plane
	166	*
	167	* Return the CMA GEM object for given framebuffer.
	168	*
	169	* This function will usually be called from the CRTC callback functions.
	170	*/
	171	struct drm_gem_cma_object drm_fb_cma_get_gem_obj(struct drm_framebuffer fb,
	172	unsigned int plane)
	173	{
	174	struct drm_fb_cma *fb_cma = to_fb_cma(fb);
175
176	if (plane >= 4)
177	return NULL;
178
179	return fb_cma->obj[plane];
180	}
181	EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
182
6f646095	183	#ifdef CONFIG_DEBUG_FS
2c9c52e8	184	/*
6f646095 RC	185	* drm_fb_cma_describe() - Helper to dump information about a single
	186	* CMA framebuffer object
	187	*/
2c9c52e8	188	static void drm_fb_cma_describe(struct drm_framebuffer fb, struct seq_file m)
6f646095 RC	189	{
	190	struct drm_fb_cma *fb_cma = to_fb_cma(fb);
	191	int i, n = drm_format_num_planes(fb->pixel_format);
	192
	193	seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
	194	(char *)&fb->pixel_format);
	195
	196	for (i = 0; i < n; i++) {
	197	seq_printf(m, " %d: offset=%d pitch=%d, obj: ",
	198	i, fb->offsets[i], fb->pitches[i]);
	199	drm_gem_cma_describe(fb_cma->obj[i], m);
	200	}
	201	}
6f646095 RC	202
	203	/**
	204	* drm_fb_cma_debugfs_show() - Helper to list CMA framebuffer objects
	205	* in debugfs.
	206	*/
	207	int drm_fb_cma_debugfs_show(struct seq_file m, void arg)
	208	{
	209	struct drm_info_node node = (struct drm_info_node ) m->private;
	210	struct drm_device *dev = node->minor->dev;
	211	struct drm_framebuffer *fb;
6f646095	212
9e75c0ef	213	mutex_lock(&dev->mode_config.fb_lock);
e4f62546	214	drm_for_each_fb(fb, dev)
6f646095	215	drm_fb_cma_describe(fb, m);
9e75c0ef	216	mutex_unlock(&dev->mode_config.fb_lock);
6f646095 RC	217
	218	return 0;
	219	}
	220	EXPORT_SYMBOL_GPL(drm_fb_cma_debugfs_show);
	221	#endif
	222
2e3b3c42 LPC	223	static struct fb_ops drm_fbdev_cma_ops = {
2e3b3c42 LPC	224	.owner = THIS_MODULE,
85f2edf2 AT	225	.fb_fillrect = drm_fb_helper_sys_fillrect,
	226	.fb_copyarea = drm_fb_helper_sys_copyarea,
	227	.fb_imageblit = drm_fb_helper_sys_imageblit,
2e3b3c42 LPC	228	.fb_check_var = drm_fb_helper_check_var,
	229	.fb_set_par = drm_fb_helper_set_par,
	230	.fb_blank = drm_fb_helper_blank,
	231	.fb_pan_display = drm_fb_helper_pan_display,
	232	.fb_setcmap = drm_fb_helper_setcmap,
	233	};
	234
	235	static int drm_fbdev_cma_create(struct drm_fb_helper *helper,
	236	struct drm_fb_helper_surface_size *sizes)
	237	{
	238	struct drm_fbdev_cma *fbdev_cma = to_fbdev_cma(helper);
	239	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
	240	struct drm_device *dev = helper->dev;
	241	struct drm_gem_cma_object *obj;
	242	struct drm_framebuffer *fb;
	243	unsigned int bytes_per_pixel;
	244	unsigned long offset;
	245	struct fb_info *fbi;
	246	size_t size;
	247	int ret;
	248
e0d78d08	249	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d)\n",
2e3b3c42 LPC	250	sizes->surface_width, sizes->surface_height,
	251	sizes->surface_bpp);
	252
	253	bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
	254
	255	mode_cmd.width = sizes->surface_width;
	256	mode_cmd.height = sizes->surface_height;
	257	mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
	258	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
	259	sizes->surface_depth);
	260
	261	size = mode_cmd.pitches[0] * mode_cmd.height;
	262	obj = drm_gem_cma_create(dev, size);
02813245	263	if (IS_ERR(obj))
2e3b3c42 LPC	264	return -ENOMEM;
2e3b3c42 LPC	265
85f2edf2 AT	266	fbi = drm_fb_helper_alloc_fbi(helper);
	267	if (IS_ERR(fbi)) {
	268	ret = PTR_ERR(fbi);
50cbc132	269	goto err_gem_free_object;
2e3b3c42 LPC	270	}
	271
	272	fbdev_cma->fb = drm_fb_cma_alloc(dev, &mode_cmd, &obj, 1);
	273	if (IS_ERR(fbdev_cma->fb)) {
	274	dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
	275	ret = PTR_ERR(fbdev_cma->fb);
85f2edf2	276	goto err_fb_info_destroy;
2e3b3c42 LPC	277	}
	278
	279	fb = &fbdev_cma->fb->fb;
	280	helper->fb = fb;
2e3b3c42 LPC	281
	282	fbi->par = helper;
	283	fbi->flags = FBINFO_FLAG_DEFAULT;
	284	fbi->fbops = &drm_fbdev_cma_ops;
	285
2e3b3c42	286	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
8d76612b	287	drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
2e3b3c42 LPC	288
	289	offset = fbi->var.xoffset * bytes_per_pixel;
	290	offset += fbi->var.yoffset * fb->pitches[0];
	291
	292	dev->mode_config.fb_base = (resource_size_t)obj->paddr;
	293	fbi->screen_base = obj->vaddr + offset;
	294	fbi->fix.smem_start = (unsigned long)(obj->paddr + offset);
	295	fbi->screen_size = size;
	296	fbi->fix.smem_len = size;
	297
	298	return 0;
	299
85f2edf2 AT	300	err_fb_info_destroy:
85f2edf2 AT	301	drm_fb_helper_release_fbi(helper);
50cbc132 EA	302	err_gem_free_object:
50cbc132 EA	303	dev->driver->gem_free_object(&obj->base);
2e3b3c42 LPC	304	return ret;
	305	}
	306
3a493879	307	static const struct drm_fb_helper_funcs drm_fb_cma_helper_funcs = {
cd5428a5	308	.fb_probe = drm_fbdev_cma_create,
2e3b3c42 LPC	309	};
	310
	311	/**
	312	* drm_fbdev_cma_init() - Allocate and initializes a drm_fbdev_cma struct
	313	* @dev: DRM device
	314	* @preferred_bpp: Preferred bits per pixel for the device
	315	* @num_crtc: Number of CRTCs
	316	* @max_conn_count: Maximum number of connectors
	317	*
	318	* Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR.
	319	*/
	320	struct drm_fbdev_cma drm_fbdev_cma_init(struct drm_device dev,
	321	unsigned int preferred_bpp, unsigned int num_crtc,
	322	unsigned int max_conn_count)
	323	{
	324	struct drm_fbdev_cma *fbdev_cma;
	325	struct drm_fb_helper *helper;
	326	int ret;
	327
	328	fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL);
	329	if (!fbdev_cma) {
	330	dev_err(dev->dev, "Failed to allocate drm fbdev.\n");
	331	return ERR_PTR(-ENOMEM);
	332	}
	333
2e3b3c42 LPC	334	helper = &fbdev_cma->fb_helper;
2e3b3c42 LPC	335
10a23102 TR	336	drm_fb_helper_prepare(dev, helper, &drm_fb_cma_helper_funcs);
10a23102 TR	337
2e3b3c42 LPC	338	ret = drm_fb_helper_init(dev, helper, num_crtc, max_conn_count);
	339	if (ret < 0) {
	340	dev_err(dev->dev, "Failed to initialize drm fb helper.\n");
	341	goto err_free;
	342	}
	343
	344	ret = drm_fb_helper_single_add_all_connectors(helper);
	345	if (ret < 0) {
	346	dev_err(dev->dev, "Failed to add connectors.\n");
	347	goto err_drm_fb_helper_fini;
	348
	349	}
	350
	351	ret = drm_fb_helper_initial_config(helper, preferred_bpp);
	352	if (ret < 0) {
8b513d0c	353	dev_err(dev->dev, "Failed to set initial hw configuration.\n");
2e3b3c42 LPC	354	goto err_drm_fb_helper_fini;
	355	}
	356
	357	return fbdev_cma;
	358
	359	err_drm_fb_helper_fini:
	360	drm_fb_helper_fini(helper);
	361	err_free:
	362	kfree(fbdev_cma);
	363
	364	return ERR_PTR(ret);
	365	}
	366	EXPORT_SYMBOL_GPL(drm_fbdev_cma_init);
	367
	368	/**
	369	* drm_fbdev_cma_fini() - Free drm_fbdev_cma struct
	370	* @fbdev_cma: The drm_fbdev_cma struct
	371	*/
	372	void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma)
	373	{
85f2edf2 AT	374	drm_fb_helper_unregister_fbi(&fbdev_cma->fb_helper);
85f2edf2 AT	375	drm_fb_helper_release_fbi(&fbdev_cma->fb_helper);
2e3b3c42	376
36206361 DV	377	if (fbdev_cma->fb) {
36206361 DV	378	drm_framebuffer_unregister_private(&fbdev_cma->fb->fb);
2e3b3c42	379	drm_fb_cma_destroy(&fbdev_cma->fb->fb);
36206361	380	}
2e3b3c42 LPC	381
	382	drm_fb_helper_fini(&fbdev_cma->fb_helper);
	383	kfree(fbdev_cma);
	384	}
	385	EXPORT_SYMBOL_GPL(drm_fbdev_cma_fini);
	386
	387	/**
	388	* drm_fbdev_cma_restore_mode() - Restores initial framebuffer mode
	389	* @fbdev_cma: The drm_fbdev_cma struct, may be NULL
	390	*
	391	* This function is usually called from the DRM drivers lastclose callback.
	392	*/
	393	void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_cma)
	394	{
5ea1f752 RC	395	if (fbdev_cma)
5ea1f752 RC	396	drm_fb_helper_restore_fbdev_mode_unlocked(&fbdev_cma->fb_helper);
2e3b3c42 LPC	397	}
	398	EXPORT_SYMBOL_GPL(drm_fbdev_cma_restore_mode);
	399
	400	/**
	401	* drm_fbdev_cma_hotplug_event() - Poll for hotpulug events
	402	* @fbdev_cma: The drm_fbdev_cma struct, may be NULL
	403	*
	404	* This function is usually called from the DRM drivers output_poll_changed
	405	* callback.
	406	*/
	407	void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma)
	408	{
	409	if (fbdev_cma)
	410	drm_fb_helper_hotplug_event(&fbdev_cma->fb_helper);
	411	}
	412	EXPORT_SYMBOL_GPL(drm_fbdev_cma_hotplug_event);