drivers/gpu/drm/ast/ast_fb.c - kernel/quantenna - Git at Google

 /*
  * Copyright 2012 Red Hat Inc.
  *
  * 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
  * THE COPYRIGHT HOLDERS, AUTHORS 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.
  *
  * The above copyright notice and this permission notice (including the
  * next paragraph) shall be included in all copies or substantial portions
  * of the Software.
  *
  */
 /*
  * Authors: Dave Airlie <airlied@redhat.com>
  */
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/mm.h>
 #include <linux/tty.h>
 #include <linux/sysrq.h>
 #include <linux/delay.h>
 #include <linux/fb.h>
 #include <linux/init.h>


 #include <drm/drmP.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_crtc_helper.h>
 #include "ast_drv.h"

 static void ast_dirty_update(struct ast_fbdev *afbdev,
 			     int x, int y, int width, int height)
 {
 	int i;
 	struct drm_gem_object *obj;
 	struct ast_bo *bo;
 	int src_offset, dst_offset;
 	int bpp = (afbdev->afb.base.bits_per_pixel + 7)/8;
 	int ret = -EBUSY;
 	bool unmap = false;
 	bool store_for_later = false;
 	int x2, y2;
 	unsigned long flags;

 	obj = afbdev->afb.obj;
 	bo = gem_to_ast_bo(obj);

 	/*
 	 * try and reserve the BO, if we fail with busy
 	 * then the BO is being moved and we should
 	 * store up the damage until later.
 	 */
 	if (drm_can_sleep())
 		ret = ast_bo_reserve(bo, true);
 	if (ret) {
 		if (ret != -EBUSY)
 			return;

 		store_for_later = true;
 	}

 	x2 = x + width - 1;
 	y2 = y + height - 1;
 	spin_lock_irqsave(&afbdev->dirty_lock, flags);

 	if (afbdev->y1 < y)
 		y = afbdev->y1;
 	if (afbdev->y2 > y2)
 		y2 = afbdev->y2;
 	if (afbdev->x1 < x)
 		x = afbdev->x1;
 	if (afbdev->x2 > x2)
 		x2 = afbdev->x2;

 	if (store_for_later) {
 		afbdev->x1 = x;
 		afbdev->x2 = x2;
 		afbdev->y1 = y;
 		afbdev->y2 = y2;
 		spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
 		return;
 	}

 	afbdev->x1 = afbdev->y1 = INT_MAX;
 	afbdev->x2 = afbdev->y2 = 0;
 	spin_unlock_irqrestore(&afbdev->dirty_lock, flags);

 	if (!bo->kmap.virtual) {
 		ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
 		if (ret) {
 			DRM_ERROR("failed to kmap fb updates\n");
 			ast_bo_unreserve(bo);
 			return;
 		}
 		unmap = true;
 	}
 	for (i = y; i <= y2; i++) {
 		/* assume equal stride for now */
 		src_offset = dst_offset = i * afbdev->afb.base.pitches[0] + (x * bpp);
 		memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, (x2 - x + 1) * bpp);

 	}
 	if (unmap)
 		ttm_bo_kunmap(&bo->kmap);

 	ast_bo_unreserve(bo);
 }

 static void ast_fillrect(struct fb_info *info,
 			 const struct fb_fillrect *rect)
 {
 	struct ast_fbdev *afbdev = info->par;
 	drm_fb_helper_sys_fillrect(info, rect);
 	ast_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
 			 rect->height);
 }

 static void ast_copyarea(struct fb_info *info,
 			 const struct fb_copyarea *area)
 {
 	struct ast_fbdev *afbdev = info->par;
 	drm_fb_helper_sys_copyarea(info, area);
 	ast_dirty_update(afbdev, area->dx, area->dy, area->width,
 			 area->height);
 }

 static void ast_imageblit(struct fb_info *info,
 			  const struct fb_image *image)
 {
 	struct ast_fbdev *afbdev = info->par;
 	drm_fb_helper_sys_imageblit(info, image);
 	ast_dirty_update(afbdev, image->dx, image->dy, image->width,
 			 image->height);
 }

 static struct fb_ops astfb_ops = {
 	.owner = THIS_MODULE,
 	.fb_check_var = drm_fb_helper_check_var,
 	.fb_set_par = drm_fb_helper_set_par,
 	.fb_fillrect = ast_fillrect,
 	.fb_copyarea = ast_copyarea,
 	.fb_imageblit = ast_imageblit,
 	.fb_pan_display = drm_fb_helper_pan_display,
 	.fb_blank = drm_fb_helper_blank,
 	.fb_setcmap = drm_fb_helper_setcmap,
 	.fb_debug_enter = drm_fb_helper_debug_enter,
 	.fb_debug_leave = drm_fb_helper_debug_leave,
 };

 static int astfb_create_object(struct ast_fbdev *afbdev,
 			       const struct drm_mode_fb_cmd2 *mode_cmd,
 			       struct drm_gem_object **gobj_p)
 {
 	struct drm_device *dev = afbdev->helper.dev;
 	u32 bpp, depth;
 	u32 size;
 	struct drm_gem_object *gobj;

 	int ret = 0;
 	drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);

 	size = mode_cmd->pitches[0] * mode_cmd->height;
 	ret = ast_gem_create(dev, size, true, &gobj);
 	if (ret)
 		return ret;

 	*gobj_p = gobj;
 	return ret;
 }

 static int astfb_create(struct drm_fb_helper *helper,
 			struct drm_fb_helper_surface_size *sizes)
 {
 	struct ast_fbdev *afbdev =
 		container_of(helper, struct ast_fbdev, helper);
 	struct drm_device *dev = afbdev->helper.dev;
 	struct drm_mode_fb_cmd2 mode_cmd;
 	struct drm_framebuffer *fb;
 	struct fb_info *info;
 	int size, ret;
 	void *sysram;
 	struct drm_gem_object *gobj = NULL;
 	struct ast_bo *bo = NULL;
 	mode_cmd.width = sizes->surface_width;
 	mode_cmd.height = sizes->surface_height;
 	mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7)/8);

 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 							  sizes->surface_depth);

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

 	ret = astfb_create_object(afbdev, &mode_cmd, &gobj);
 	if (ret) {
 		DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 		return ret;
 	}
 	bo = gem_to_ast_bo(gobj);

 	sysram = vmalloc(size);
 	if (!sysram)
 		return -ENOMEM;

 	info = drm_fb_helper_alloc_fbi(helper);
 	if (IS_ERR(info)) {
 		ret = PTR_ERR(info);
 		goto err_free_vram;
 	}
 	info->par = afbdev;

 	ret = ast_framebuffer_init(dev, &afbdev->afb, &mode_cmd, gobj);
 	if (ret)
 		goto err_release_fbi;

 	afbdev->sysram = sysram;
 	afbdev->size = size;

 	fb = &afbdev->afb.base;
 	afbdev->helper.fb = fb;

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

 	info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 	info->fbops = &astfb_ops;

 	info->apertures->ranges[0].base = pci_resource_start(dev->pdev, 0);
 	info->apertures->ranges[0].size = pci_resource_len(dev->pdev, 0);

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

 	info->screen_base = sysram;
 	info->screen_size = size;

 	info->pixmap.flags = FB_PIXMAP_SYSTEM;

 	DRM_DEBUG_KMS("allocated %dx%d\n",
 		      fb->width, fb->height);

 	return 0;

 err_release_fbi:
 	drm_fb_helper_release_fbi(helper);
 err_free_vram:
 	vfree(afbdev->sysram);
 	return ret;
 }

 static void ast_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 			       u16 blue, int regno)
 {
 	struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
 	ast_crtc->lut_r[regno] = red >> 8;
 	ast_crtc->lut_g[regno] = green >> 8;
 	ast_crtc->lut_b[regno] = blue >> 8;
 }

 static void ast_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 			       u16 *blue, int regno)
 {
 	struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
 	*red = ast_crtc->lut_r[regno] << 8;
 	*green = ast_crtc->lut_g[regno] << 8;
 	*blue = ast_crtc->lut_b[regno] << 8;
 }

 static const struct drm_fb_helper_funcs ast_fb_helper_funcs = {
 	.gamma_set = ast_fb_gamma_set,
 	.gamma_get = ast_fb_gamma_get,
 	.fb_probe = astfb_create,
 };

 static void ast_fbdev_destroy(struct drm_device *dev,
 			      struct ast_fbdev *afbdev)
 {
 	struct ast_framebuffer *afb = &afbdev->afb;

 	drm_fb_helper_unregister_fbi(&afbdev->helper);
 	drm_fb_helper_release_fbi(&afbdev->helper);

 	if (afb->obj) {
 		drm_gem_object_unreference_unlocked(afb->obj);
 		afb->obj = NULL;
 	}
 	drm_fb_helper_fini(&afbdev->helper);

 	vfree(afbdev->sysram);
 	drm_framebuffer_unregister_private(&afb->base);
 	drm_framebuffer_cleanup(&afb->base);
 }

 int ast_fbdev_init(struct drm_device *dev)
 {
 	struct ast_private *ast = dev->dev_private;
 	struct ast_fbdev *afbdev;
 	int ret;

 	afbdev = kzalloc(sizeof(struct ast_fbdev), GFP_KERNEL);
 	if (!afbdev)
 		return -ENOMEM;

 	ast->fbdev = afbdev;
 	spin_lock_init(&afbdev->dirty_lock);

 	drm_fb_helper_prepare(dev, &afbdev->helper, &ast_fb_helper_funcs);

 	ret = drm_fb_helper_init(dev, &afbdev->helper,
 				 1, 1);
 	if (ret)
 		goto free;

 	ret = drm_fb_helper_single_add_all_connectors(&afbdev->helper);
 	if (ret)
 		goto fini;

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

 	ret = drm_fb_helper_initial_config(&afbdev->helper, 32);
 	if (ret)
 		goto fini;

 	return 0;

 fini:
 	drm_fb_helper_fini(&afbdev->helper);
 free:
 	kfree(afbdev);
 	return ret;
 }

 void ast_fbdev_fini(struct drm_device *dev)
 {
 	struct ast_private *ast = dev->dev_private;

 	if (!ast->fbdev)
 		return;

 	ast_fbdev_destroy(dev, ast->fbdev);
 	kfree(ast->fbdev);
 	ast->fbdev = NULL;
 }

 void ast_fbdev_set_suspend(struct drm_device *dev, int state)
 {
 	struct ast_private *ast = dev->dev_private;

 	if (!ast->fbdev)
 		return;

 	drm_fb_helper_set_suspend(&ast->fbdev->helper, state);
 }

 void ast_fbdev_set_base(struct ast_private *ast, unsigned long gpu_addr)
 {
 	ast->fbdev->helper.fbdev->fix.smem_start =
 		ast->fbdev->helper.fbdev->apertures->ranges[0].base + gpu_addr;
 	ast->fbdev->helper.fbdev->fix.smem_len = ast->vram_size - gpu_addr;
 }
	/*
	* Copyright 2012 Red Hat Inc.
	*
	* 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
	* THE COPYRIGHT HOLDERS, AUTHORS 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.
	*
	* The above copyright notice and this permission notice (including the
	* next paragraph) shall be included in all copies or substantial portions
	* of the Software.
	*
	*/
	/*
	* Authors: Dave Airlie <airlied@redhat.com>
	*/
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/string.h>
	#include <linux/mm.h>
	#include <linux/tty.h>
	#include <linux/sysrq.h>
	#include <linux/delay.h>
	#include <linux/fb.h>
	#include <linux/init.h>


	#include <drm/drmP.h>
	#include <drm/drm_crtc.h>
	#include <drm/drm_fb_helper.h>
	#include <drm/drm_crtc_helper.h>
	#include "ast_drv.h"

	static void ast_dirty_update(struct ast_fbdev *afbdev,
	int x, int y, int width, int height)
	{
	int i;
	struct drm_gem_object *obj;
	struct ast_bo *bo;
	int src_offset, dst_offset;
	int bpp = (afbdev->afb.base.bits_per_pixel + 7)/8;
	int ret = -EBUSY;
	bool unmap = false;
	bool store_for_later = false;
	int x2, y2;
	unsigned long flags;

	obj = afbdev->afb.obj;
	bo = gem_to_ast_bo(obj);

	/*
	* try and reserve the BO, if we fail with busy
	* then the BO is being moved and we should
	* store up the damage until later.
	*/
	if (drm_can_sleep())
	ret = ast_bo_reserve(bo, true);
	if (ret) {
	if (ret != -EBUSY)
	return;

	store_for_later = true;
	}

	x2 = x + width - 1;
	y2 = y + height - 1;
	spin_lock_irqsave(&afbdev->dirty_lock, flags);

	if (afbdev->y1 < y)
	y = afbdev->y1;
	if (afbdev->y2 > y2)
	y2 = afbdev->y2;
	if (afbdev->x1 < x)
	x = afbdev->x1;
	if (afbdev->x2 > x2)
	x2 = afbdev->x2;

	if (store_for_later) {
	afbdev->x1 = x;
	afbdev->x2 = x2;
	afbdev->y1 = y;
	afbdev->y2 = y2;
	spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
	return;
	}

	afbdev->x1 = afbdev->y1 = INT_MAX;
	afbdev->x2 = afbdev->y2 = 0;
	spin_unlock_irqrestore(&afbdev->dirty_lock, flags);

	if (!bo->kmap.virtual) {
	ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
	if (ret) {
	DRM_ERROR("failed to kmap fb updates\n");
	ast_bo_unreserve(bo);
	return;
	}
	unmap = true;
	}
	for (i = y; i <= y2; i++) {
	/* assume equal stride for now */
	src_offset = dst_offset = i * afbdev->afb.base.pitches[0] + (x * bpp);
	memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, (x2 - x + 1) * bpp);

	}
	if (unmap)
	ttm_bo_kunmap(&bo->kmap);

	ast_bo_unreserve(bo);
	}

	static void ast_fillrect(struct fb_info *info,
	const struct fb_fillrect *rect)
	{
	struct ast_fbdev *afbdev = info->par;
	drm_fb_helper_sys_fillrect(info, rect);
	ast_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
	rect->height);
	}

	static void ast_copyarea(struct fb_info *info,
	const struct fb_copyarea *area)
	{
	struct ast_fbdev *afbdev = info->par;
	drm_fb_helper_sys_copyarea(info, area);
	ast_dirty_update(afbdev, area->dx, area->dy, area->width,
	area->height);
	}

	static void ast_imageblit(struct fb_info *info,
	const struct fb_image *image)
	{
	struct ast_fbdev *afbdev = info->par;
	drm_fb_helper_sys_imageblit(info, image);
	ast_dirty_update(afbdev, image->dx, image->dy, image->width,
	image->height);
	}

	static struct fb_ops astfb_ops = {
	.owner = THIS_MODULE,
	.fb_check_var = drm_fb_helper_check_var,
	.fb_set_par = drm_fb_helper_set_par,
	.fb_fillrect = ast_fillrect,
	.fb_copyarea = ast_copyarea,
	.fb_imageblit = ast_imageblit,
	.fb_pan_display = drm_fb_helper_pan_display,
	.fb_blank = drm_fb_helper_blank,
	.fb_setcmap = drm_fb_helper_setcmap,
	.fb_debug_enter = drm_fb_helper_debug_enter,
	.fb_debug_leave = drm_fb_helper_debug_leave,
	};

	static int astfb_create_object(struct ast_fbdev *afbdev,
	const struct drm_mode_fb_cmd2 *mode_cmd,
	struct drm_gem_object **gobj_p)
	{
	struct drm_device *dev = afbdev->helper.dev;
	u32 bpp, depth;
	u32 size;
	struct drm_gem_object *gobj;

	int ret = 0;
	drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);

	size = mode_cmd->pitches[0] * mode_cmd->height;
	ret = ast_gem_create(dev, size, true, &gobj);
	if (ret)
	return ret;

	*gobj_p = gobj;
	return ret;
	}

	static int astfb_create(struct drm_fb_helper *helper,
	struct drm_fb_helper_surface_size *sizes)
	{
	struct ast_fbdev *afbdev =
	container_of(helper, struct ast_fbdev, helper);
	struct drm_device *dev = afbdev->helper.dev;
	struct drm_mode_fb_cmd2 mode_cmd;
	struct drm_framebuffer *fb;
	struct fb_info *info;
	int size, ret;
	void *sysram;
	struct drm_gem_object *gobj = NULL;
	struct ast_bo *bo = NULL;
	mode_cmd.width = sizes->surface_width;
	mode_cmd.height = sizes->surface_height;
	mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7)/8);

	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
	sizes->surface_depth);

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

	ret = astfb_create_object(afbdev, &mode_cmd, &gobj);
	if (ret) {
	DRM_ERROR("failed to create fbcon backing object %d\n", ret);
	return ret;
	}
	bo = gem_to_ast_bo(gobj);

	sysram = vmalloc(size);
	if (!sysram)
	return -ENOMEM;

	info = drm_fb_helper_alloc_fbi(helper);
	if (IS_ERR(info)) {
	ret = PTR_ERR(info);
	goto err_free_vram;
	}
	info->par = afbdev;

	ret = ast_framebuffer_init(dev, &afbdev->afb, &mode_cmd, gobj);
	if (ret)
	goto err_release_fbi;

	afbdev->sysram = sysram;
	afbdev->size = size;

	fb = &afbdev->afb.base;
	afbdev->helper.fb = fb;

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

	info->flags = FBINFO_DEFAULT \| FBINFO_CAN_FORCE_OUTPUT;
	info->fbops = &astfb_ops;

	info->apertures->ranges[0].base = pci_resource_start(dev->pdev, 0);
	info->apertures->ranges[0].size = pci_resource_len(dev->pdev, 0);

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

	info->screen_base = sysram;
	info->screen_size = size;

	info->pixmap.flags = FB_PIXMAP_SYSTEM;

	DRM_DEBUG_KMS("allocated %dx%d\n",
	fb->width, fb->height);

	return 0;

	err_release_fbi:
	drm_fb_helper_release_fbi(helper);
	err_free_vram:
	vfree(afbdev->sysram);
	return ret;
	}

	static void ast_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
	u16 blue, int regno)
	{
	struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
	ast_crtc->lut_r[regno] = red >> 8;
	ast_crtc->lut_g[regno] = green >> 8;
	ast_crtc->lut_b[regno] = blue >> 8;
	}

	static void ast_fb_gamma_get(struct drm_crtc crtc, u16 red, u16 *green,
	u16 *blue, int regno)
	{
	struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
	*red = ast_crtc->lut_r[regno] << 8;
	*green = ast_crtc->lut_g[regno] << 8;
	*blue = ast_crtc->lut_b[regno] << 8;
	}

	static const struct drm_fb_helper_funcs ast_fb_helper_funcs = {
	.gamma_set = ast_fb_gamma_set,
	.gamma_get = ast_fb_gamma_get,
	.fb_probe = astfb_create,
	};

	static void ast_fbdev_destroy(struct drm_device *dev,
	struct ast_fbdev *afbdev)
	{
	struct ast_framebuffer *afb = &afbdev->afb;

	drm_fb_helper_unregister_fbi(&afbdev->helper);
	drm_fb_helper_release_fbi(&afbdev->helper);

	if (afb->obj) {
	drm_gem_object_unreference_unlocked(afb->obj);
	afb->obj = NULL;
	}
	drm_fb_helper_fini(&afbdev->helper);

	vfree(afbdev->sysram);
	drm_framebuffer_unregister_private(&afb->base);
	drm_framebuffer_cleanup(&afb->base);
	}

	int ast_fbdev_init(struct drm_device *dev)
	{
	struct ast_private *ast = dev->dev_private;
	struct ast_fbdev *afbdev;
	int ret;

	afbdev = kzalloc(sizeof(struct ast_fbdev), GFP_KERNEL);
	if (!afbdev)
	return -ENOMEM;

	ast->fbdev = afbdev;
	spin_lock_init(&afbdev->dirty_lock);

	drm_fb_helper_prepare(dev, &afbdev->helper, &ast_fb_helper_funcs);

	ret = drm_fb_helper_init(dev, &afbdev->helper,
	1, 1);
	if (ret)
	goto free;

	ret = drm_fb_helper_single_add_all_connectors(&afbdev->helper);
	if (ret)
	goto fini;

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

	ret = drm_fb_helper_initial_config(&afbdev->helper, 32);
	if (ret)
	goto fini;

	return 0;

	fini:
	drm_fb_helper_fini(&afbdev->helper);
	free:
	kfree(afbdev);
	return ret;
	}

	void ast_fbdev_fini(struct drm_device *dev)
	{
	struct ast_private *ast = dev->dev_private;

	if (!ast->fbdev)
	return;

	ast_fbdev_destroy(dev, ast->fbdev);
	kfree(ast->fbdev);
	ast->fbdev = NULL;
	}

	void ast_fbdev_set_suspend(struct drm_device *dev, int state)
	{
	struct ast_private *ast = dev->dev_private;

	if (!ast->fbdev)
	return;

	drm_fb_helper_set_suspend(&ast->fbdev->helper, state);
	}

	void ast_fbdev_set_base(struct ast_private *ast, unsigned long gpu_addr)
	{
	ast->fbdev->helper.fbdev->fix.smem_start =
	ast->fbdev->helper.fbdev->apertures->ranges[0].base + gpu_addr;
	ast->fbdev->helper.fbdev->fix.smem_len = ast->vram_size - gpu_addr;
	}