drivers/gpu/drm/bochs/bochs_fbdev.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  */
   7
   8 #include "bochs.h"
   9
  10 /* ---------------------------------------------------------------------- */
  11
  12 static struct fb_ops bochsfb_ops = {
  13         .owner = THIS_MODULE,
  14         .fb_check_var = drm_fb_helper_check_var,
  15         .fb_set_par = drm_fb_helper_set_par,
  16         .fb_fillrect = sys_fillrect,
  17         .fb_copyarea = sys_copyarea,
  18         .fb_imageblit = sys_imageblit,
  19         .fb_pan_display = drm_fb_helper_pan_display,
  20         .fb_blank = drm_fb_helper_blank,
  21         .fb_setcmap = drm_fb_helper_setcmap,
  22 };
  23
  24 static int bochsfb_create_object(struct bochs_device *bochs,
  25                                  struct drm_mode_fb_cmd2 *mode_cmd,
  26                                  struct drm_gem_object **gobj_p)
  27 {
  28         struct drm_device *dev = bochs->dev;
  29         struct drm_gem_object *gobj;
  30         u32 size;
  31         int ret = 0;
  32
  33         size = mode_cmd->pitches[0] * mode_cmd->height;
  34         ret = bochs_gem_create(dev, size, true, &gobj);
  35         if (ret)
  36                 return ret;
  37
  38         *gobj_p = gobj;
  39         return ret;
  40 }
  41
  42 static int bochsfb_create(struct drm_fb_helper *helper,
  43                           struct drm_fb_helper_surface_size *sizes)
  44 {
  45         struct bochs_device *bochs =
  46                 container_of(helper, struct bochs_device, fb.helper);
  47         struct drm_device *dev = bochs->dev;
  48         struct fb_info *info;
  49         struct drm_framebuffer *fb;
  50         struct drm_mode_fb_cmd2 mode_cmd;
  51         struct device *device = &dev->pdev->dev;
  52         struct drm_gem_object *gobj = NULL;
  53         struct bochs_bo *bo = NULL;
  54         int size, ret;
  55
  56         if (sizes->surface_bpp != 32)
  57                 return -EINVAL;
  58
  59         mode_cmd.width = sizes->surface_width;
  60         mode_cmd.height = sizes->surface_height;
  61         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
  62         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  63                                                           sizes->surface_depth);
  64         size = mode_cmd.pitches[0] * mode_cmd.height;
  65
  66         /* alloc, pin & map bo */
  67         ret = bochsfb_create_object(bochs, &mode_cmd, &gobj);
  68         if (ret) {
  69                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
  70                 return ret;
  71         }
  72
  73         bo = gem_to_bochs_bo(gobj);
  74
  75         ret = ttm_bo_reserve(&bo->bo, true, false, false, 0);
  76         if (ret)
  77                 return ret;
  78
  79         ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, NULL);
  80         if (ret) {
  81                 DRM_ERROR("failed to pin fbcon\n");
  82                 ttm_bo_unreserve(&bo->bo);
  83                 return ret;
  84         }
  85
  86         ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages,
  87                           &bo->kmap);
  88         if (ret) {
  89                 DRM_ERROR("failed to kmap fbcon\n");
  90                 ttm_bo_unreserve(&bo->bo);
  91                 return ret;
  92         }
  93
  94         ttm_bo_unreserve(&bo->bo);
  95
  96         /* init fb device */
  97         info = framebuffer_alloc(0, device);
  98         if (info == NULL)
  99                 return -ENOMEM;
 100
 101         info->par = &bochs->fb.helper;
 102
 103         ret = bochs_framebuffer_init(bochs->dev, &bochs->fb.gfb, &mode_cmd, gobj);
 104         if (ret)
 105                 return ret;
 106
 107         bochs->fb.size = size;
 108
 109         /* setup helper */
 110         fb = &bochs->fb.gfb.base;
 111         bochs->fb.helper.fb = fb;
 112         bochs->fb.helper.fbdev = info;
 113
 114         strcpy(info->fix.id, "bochsdrmfb");
 115
 116         info->flags = FBINFO_DEFAULT;
 117         info->fbops = &bochsfb_ops;
 118
 119         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 120         drm_fb_helper_fill_var(info, &bochs->fb.helper, sizes->fb_width,
 121                                sizes->fb_height);
 122
 123         info->screen_base = bo->kmap.virtual;
 124         info->screen_size = size;
 125
 126 #if 0
 127         /* FIXME: get this right for mmap(/dev/fb0) */
 128         info->fix.smem_start = bochs_bo_mmap_offset(bo);
 129         info->fix.smem_len = size;
 130 #endif
 131
 132         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 133         if (ret) {
 134                 DRM_ERROR("%s: can't allocate color map\n", info->fix.id);
 135                 return -ENOMEM;
 136         }
 137
 138         return 0;
 139 }
 140
 141 static int bochs_fbdev_destroy(struct bochs_device *bochs)
 142 {
 143         struct bochs_framebuffer *gfb = &bochs->fb.gfb;
 144         struct fb_info *info;
 145
 146         DRM_DEBUG_DRIVER("\n");
 147
 148         if (bochs->fb.helper.fbdev) {
 149                 info = bochs->fb.helper.fbdev;
 150
 151                 unregister_framebuffer(info);
 152                 if (info->cmap.len)
 153                         fb_dealloc_cmap(&info->cmap);
 154                 framebuffer_release(info);
 155         }
 156
 157         if (gfb->obj) {
 158                 drm_gem_object_unreference_unlocked(gfb->obj);
 159                 gfb->obj = NULL;
 160         }
 161
 162         drm_fb_helper_fini(&bochs->fb.helper);
 163         drm_framebuffer_unregister_private(&gfb->base);
 164         drm_framebuffer_cleanup(&gfb->base);
 165
 166         return 0;
 167 }
 168
 169 void bochs_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 170                         u16 blue, int regno)
 171 {
 172 }
 173
 174 void bochs_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 175                         u16 *blue, int regno)
 176 {
 177         *red   = regno;
 178         *green = regno;
 179         *blue  = regno;
 180 }
 181
 182 static struct drm_fb_helper_funcs bochs_fb_helper_funcs = {
 183         .gamma_set = bochs_fb_gamma_set,
 184         .gamma_get = bochs_fb_gamma_get,
 185         .fb_probe = bochsfb_create,
 186 };
 187
 188 int bochs_fbdev_init(struct bochs_device *bochs)
 189 {
 190         int ret;
 191
 192         bochs->fb.helper.funcs = &bochs_fb_helper_funcs;
 193         spin_lock_init(&bochs->fb.dirty_lock);
 194
 195         ret = drm_fb_helper_init(bochs->dev, &bochs->fb.helper,
 196                                  1, 1);
 197         if (ret)
 198                 return ret;
 199
 200         drm_fb_helper_single_add_all_connectors(&bochs->fb.helper);
 201         drm_helper_disable_unused_functions(bochs->dev);
 202         drm_fb_helper_initial_config(&bochs->fb.helper, 32);
 203
 204         bochs->fb.initialized = true;
 205         return 0;
 206 }
 207
 208 void bochs_fbdev_fini(struct bochs_device *bochs)
 209 {
 210         if (!bochs->fb.initialized)
 211                 return;
 212
 213         bochs_fbdev_destroy(bochs);
 214         bochs->fb.initialized = false;
 215 }