text: /*
   * Copyright 2012 Red Hat
   *
   * This file is subject to the terms and conditions of the GNU General
   * Public License version 2. See the file COPYING in the main
   * directory of this archive for more details.
   *
   * Authors: Matthew Garrett
   *          Dave Airlie
   */
  #include <linux/module.h>
  #include <drm/drmP.h>
  #include <drm/drm_fb_helper.h>
  #include <drm/drm_crtc_helper.h>
  
  #include <linux/fb.h>
  
  #include "cirrus_drv.h"
  
  static void cirrus_dirty_update(struct cirrus_fbdev *afbdev,
  			     int x, int y, int width, int height)
  {
  	int i;
  	struct drm_gem_object *obj;
  	struct cirrus_bo *bo;
  	int src_offset, dst_offset;
  	int bpp = (afbdev->gfb.base.bits_per_pixel + 7)/8;
  	int ret;
  	bool unmap = false;
  	bool store_for_later = false;
  	int x2, y2;
  	unsigned long flags;
  
  	obj = afbdev->gfb.obj;
  	bo = gem_to_cirrus_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.
  	 */
  	ret = cirrus_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");
  			cirrus_bo_unreserve(bo);
  			return;
  		}
  		unmap = true;
  	}
  	for (i = y; i < y + height; i++) {
  		/* assume equal stride for now */
  		src_offset = dst_offset = i * afbdev->gfb.base.pitches[0] + (x * bpp);
  		memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, width * bpp);
  
  	}
  	if (unmap)
  		ttm_bo_kunmap(&bo->kmap);
  
  	cirrus_bo_unreserve(bo);
  }
  
  static void cirrus_fillrect(struct fb_info *info,
  			 const struct fb_fillrect *rect)
  {
  	struct cirrus_fbdev *afbdev = info->par;
  	sys_fillrect(info, rect);
  	cirrus_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
  			 rect->height);
  }
  
  static void cirrus_copyarea(struct fb_info *info,
  			 const struct fb_copyarea *area)
  {
  	struct cirrus_fbdev *afbdev = info->par;
  	sys_copyarea(info, area);
  	cirrus_dirty_update(afbdev, area->dx, area->dy, area->width,
  			 area->height);
  }
  
  static void cirrus_imageblit(struct fb_info *info,
  			  const struct fb_image *image)
  {
  	struct cirrus_fbdev *afbdev = info->par;
  	sys_imageblit(info, image);
  	cirrus_dirty_update(afbdev, image->dx, image->dy, image->width,
  			 image->height);
  }
  
  
  static struct fb_ops cirrusfb_ops = {
  	.owner = THIS_MODULE,
  	.fb_check_var = drm_fb_helper_check_var,
  	.fb_set_par = drm_fb_helper_set_par,
  	.fb_fillrect = cirrus_fillrect,
  	.fb_copyarea = cirrus_copyarea,
  	.fb_imageblit = cirrus_imageblit,
  	.fb_pan_display = drm_fb_helper_pan_display,
  	.fb_blank = drm_fb_helper_blank,
  	.fb_setcmap = drm_fb_helper_setcmap,
  };
  
  static int cirrusfb_create_object(struct cirrus_fbdev *afbdev,
  			       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);
  
  	if (bpp > 24)
  		return -EINVAL;
  	size = mode_cmd->pitches[0] * mode_cmd->height;
  	ret = cirrus_gem_create(dev, size, true, &gobj);
  	if (ret)
  		return ret;
  
  	*gobj_p = gobj;
  	return ret;
  }
  
  static int cirrusfb_create(struct drm_fb_helper *helper,
  			   struct drm_fb_helper_surface_size *sizes)
  {
  	struct cirrus_fbdev *gfbdev = (struct cirrus_fbdev *)helper;
  	struct drm_device *dev = gfbdev->helper.dev;
  	struct cirrus_device *cdev = gfbdev->helper.dev->dev_private;
  	struct fb_info *info;
  	struct drm_framebuffer *fb;
  	struct drm_mode_fb_cmd2 mode_cmd;
  	struct device *device = &dev->pdev->dev;
  	void *sysram;
  	struct drm_gem_object *gobj = NULL;
  	struct cirrus_bo *bo = NULL;
  	int size, ret;
  
  	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 = cirrusfb_create_object(gfbdev, &mode_cmd, &gobj);
  	if (ret) {
  		DRM_ERROR("failed to create fbcon backing object %d\n", ret);
  		return ret;
  	}
  
  	bo = gem_to_cirrus_bo(gobj);
  
  	sysram = vmalloc(size);
  	if (!sysram)
  		return -ENOMEM;
  
  	info = framebuffer_alloc(0, device);
  	if (info == NULL)
  		return -ENOMEM;
  
  	info->par = gfbdev;
  
  	ret = cirrus_framebuffer_init(cdev->dev, &gfbdev->gfb, &mode_cmd, gobj);
  	if (ret)
  		return ret;
  
  	gfbdev->sysram = sysram;
  	gfbdev->size = size;
  
  	fb = &gfbdev->gfb.base;
  	if (!fb) {
  		DRM_INFO("fb is NULL\n");
  		return -EINVAL;
  	}
  
  	/* setup helper */
  	gfbdev->helper.fb = fb;
  	gfbdev->helper.fbdev = info;
  
  	strcpy(info->fix.id, "cirrusdrmfb");
  
  
  	info->flags = FBINFO_DEFAULT;
  	info->fbops = &cirrusfb_ops;
  
  	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
  	drm_fb_helper_fill_var(info, &gfbdev->helper, sizes->fb_width,
  			       sizes->fb_height);
  
  	/* setup aperture base/size for vesafb takeover */
  	info->apertures = alloc_apertures(1);
  	if (!info->apertures) {
  		ret = -ENOMEM;
  		goto out_iounmap;
  	}
  	info->apertures->ranges[0].base = cdev->dev->mode_config.fb_base;
  	info->apertures->ranges[0].size = cdev->mc.vram_size;
  
  	info->screen_base = sysram;
  	info->screen_size = size;
  
  	info->fix.mmio_start = 0;
  	info->fix.mmio_len = 0;
  
  	ret = fb_alloc_cmap(&info->cmap, 256, 0);
  	if (ret) {
  		DRM_ERROR("%s: can't allocate color map\n", info->fix.id);
  		ret = -ENOMEM;
  		goto out_iounmap;
  	}
  
  	DRM_INFO("fb mappable at 0x%lX\n", info->fix.smem_start);
  	DRM_INFO("vram aper at 0x%lX\n", (unsigned long)info->fix.smem_start);
  	DRM_INFO("size %lu\n", (unsigned long)info->fix.smem_len);
  	DRM_INFO("fb depth is %d\n", fb->depth);
  	DRM_INFO("   pitch is %d\n", fb->pitches[0]);
  
  	return 0;
  out_iounmap:
  	return ret;
  }
  
  static int cirrus_fbdev_destroy(struct drm_device *dev,
  				struct cirrus_fbdev *gfbdev)
  {
  	struct fb_info *info;
  	struct cirrus_framebuffer *gfb = &gfbdev->gfb;
  
  	if (gfbdev->helper.fbdev) {
  		info = gfbdev->helper.fbdev;
  
  		unregister_framebuffer(info);
  		if (info->cmap.len)
  			fb_dealloc_cmap(&info->cmap);
  		framebuffer_release(info);
  	}
  
  	if (gfb->obj) {
  		drm_gem_object_unreference_unlocked(gfb->obj);
  		gfb->obj = NULL;
  	}
  
  	vfree(gfbdev->sysram);
  	drm_fb_helper_fini(&gfbdev->helper);
  	drm_framebuffer_unregister_private(&gfb->base);
  	drm_framebuffer_cleanup(&gfb->base);
  
  	return 0;
  }
  
  static struct drm_fb_helper_funcs cirrus_fb_helper_funcs = {
  	.gamma_set = cirrus_crtc_fb_gamma_set,
  	.gamma_get = cirrus_crtc_fb_gamma_get,
  	.fb_probe = cirrusfb_create,
  };
  
  int cirrus_fbdev_init(struct cirrus_device *cdev)
  {
  	struct cirrus_fbdev *gfbdev;
  	int ret;
  	int bpp_sel = 24;
  
  	/*bpp_sel = 8;*/
  	gfbdev = kzalloc(sizeof(struct cirrus_fbdev), GFP_KERNEL);
  	if (!gfbdev)
  		return -ENOMEM;
  
  	cdev->mode_info.gfbdev = gfbdev;
  	gfbdev->helper.funcs = &cirrus_fb_helper_funcs;
  	spin_lock_init(&gfbdev->dirty_lock);
  
  	ret = drm_fb_helper_init(cdev->dev, &gfbdev->helper,
  				 cdev->num_crtc, CIRRUSFB_CONN_LIMIT);
  	if (ret) {
  		kfree(gfbdev);
  		return ret;
  	}
  	drm_fb_helper_single_add_all_connectors(&gfbdev->helper);
  
  	/* disable all the possible outputs/crtcs before entering KMS mode */
  	drm_helper_disable_unused_functions(cdev->dev);
  	drm_fb_helper_initial_config(&gfbdev->helper, bpp_sel);
  
  	return 0;
  }
  
  void cirrus_fbdev_fini(struct cirrus_device *cdev)
  {
  	if (!cdev->mode_info.gfbdev)
  		return;
  
  	cirrus_fbdev_destroy(cdev->dev, cdev->mode_info.gfbdev);
  	kfree(cdev->mode_info.gfbdev);
  	cdev->mode_info.gfbdev = NULL;
  }
  