drivers/video/fbdev/efifb.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Framebuffer driver for EFI/UEFI based system
   4  *
   5  * (c) 2006 Edgar Hucek <gimli@dark-green.com>
   6  * Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
   7  *
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/efi.h>
  12 #include <linux/efi-bgrt.h>
  13 #include <linux/errno.h>
  14 #include <linux/fb.h>
  15 #include <linux/pci.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/printk.h>
  18 #include <linux/screen_info.h>
  19 #include <video/vga.h>
  20 #include <asm/efi.h>
  21 #include <drm/drm_utils.h> /* For drm_get_panel_orientation_quirk */
  22 #include <drm/drm_connector.h>  /* For DRM_MODE_PANEL_ORIENTATION_* */
  23
  24 struct bmp_file_header {
  25         u16 id;
  26         u32 file_size;
  27         u32 reserved;
  28         u32 bitmap_offset;
  29 } __packed;
  30
  31 struct bmp_dib_header {
  32         u32 dib_header_size;
  33         s32 width;
  34         s32 height;
  35         u16 planes;
  36         u16 bpp;
  37         u32 compression;
  38         u32 bitmap_size;
  39         u32 horz_resolution;
  40         u32 vert_resolution;
  41         u32 colors_used;
  42         u32 colors_important;
  43 } __packed;
  44
  45 static bool use_bgrt = true;
  46 static bool request_mem_succeeded = false;
  47 static u64 mem_flags = EFI_MEMORY_WC | EFI_MEMORY_UC;
  48
  49 static struct fb_var_screeninfo efifb_defined = {
  50         .activate               = FB_ACTIVATE_NOW,
  51         .height                 = -1,
  52         .width                  = -1,
  53         .right_margin           = 32,
  54         .upper_margin           = 16,
  55         .lower_margin           = 4,
  56         .vsync_len              = 4,
  57         .vmode                  = FB_VMODE_NONINTERLACED,
  58 };
  59
  60 static struct fb_fix_screeninfo efifb_fix = {
  61         .id                     = "EFI VGA",
  62         .type                   = FB_TYPE_PACKED_PIXELS,
  63         .accel                  = FB_ACCEL_NONE,
  64         .visual                 = FB_VISUAL_TRUECOLOR,
  65 };
  66
  67 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
  68                            unsigned blue, unsigned transp,
  69                            struct fb_info *info)
  70 {
  71         /*
  72          *  Set a single color register. The values supplied are
  73          *  already rounded down to the hardware's capabilities
  74          *  (according to the entries in the `var' structure). Return
  75          *  != 0 for invalid regno.
  76          */
  77
  78         if (regno >= info->cmap.len)
  79                 return 1;
  80
  81         if (regno < 16) {
  82                 red   >>= 16 - info->var.red.length;
  83                 green >>= 16 - info->var.green.length;
  84                 blue  >>= 16 - info->var.blue.length;
  85                 ((u32 *)(info->pseudo_palette))[regno] =
  86                         (red   << info->var.red.offset)   |
  87                         (green << info->var.green.offset) |
  88                         (blue  << info->var.blue.offset);
  89         }
  90         return 0;
  91 }
  92
  93 /*
  94  * If fbcon deffered console takeover is configured, the intent is for the
  95  * framebuffer to show the boot graphics (e.g. vendor logo) until there is some
  96  * (error) message to display. But the boot graphics may have been destroyed by
  97  * e.g. option ROM output, detect this and restore the boot graphics.
  98  */
  99 #if defined CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER && \
 100     defined CONFIG_ACPI_BGRT
 101 static void efifb_copy_bmp(u8 *src, u32 *dst, int width, struct screen_info *si)
 102 {
 103         u8 r, g, b;
 104
 105         while (width--) {
 106                 b = *src++;
 107                 g = *src++;
 108                 r = *src++;
 109                 *dst++ = (r << si->red_pos)   |
 110                          (g << si->green_pos) |
 111                          (b << si->blue_pos);
 112         }
 113 }
 114
 115 #ifdef CONFIG_X86
 116 /*
 117  * On x86 some firmwares use a low non native resolution for the display when
 118  * they have shown some text messages. While keeping the bgrt filled with info
 119  * for the native resolution. If the bgrt image intended for the native
 120  * resolution still fits, it will be displayed very close to the right edge of
 121  * the display looking quite bad. This function checks for this.
 122  */
 123 static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
 124 {
 125         /*
 126          * All x86 firmwares horizontally center the image (the yoffset
 127          * calculations differ between boards, but xoffset is predictable).
 128          */
 129         u32 expected_xoffset = (si->lfb_width - bmp_width) / 2;
 130
 131         return bgrt_tab.image_offset_x == expected_xoffset;
 132 }
 133 #else
 134 static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
 135 {
 136         return true;
 137 }
 138 #endif
 139
 140 static void efifb_show_boot_graphics(struct fb_info *info)
 141 {
 142         u32 bmp_width, bmp_height, bmp_pitch, screen_pitch, dst_x, y, src_y;
 143         struct screen_info *si = &screen_info;
 144         struct bmp_file_header *file_header;
 145         struct bmp_dib_header *dib_header;
 146         void *bgrt_image = NULL;
 147         u8 *dst = info->screen_base;
 148
 149         if (!use_bgrt)
 150                 return;
 151
 152         if (!bgrt_tab.image_address) {
 153                 pr_info("efifb: No BGRT, not showing boot graphics\n");
 154                 return;
 155         }
 156
 157         /* Avoid flashing the logo if we're going to print std probe messages */
 158         if (console_loglevel > CONSOLE_LOGLEVEL_QUIET)
 159                 return;
 160
 161         /* bgrt_tab.status is unreliable, so we don't check it */
 162
 163         if (si->lfb_depth != 32) {
 164                 pr_info("efifb: not 32 bits, not showing boot graphics\n");
 165                 return;
 166         }
 167
 168         bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
 169                               MEMREMAP_WB);
 170         if (!bgrt_image) {
 171                 pr_warn("efifb: Ignoring BGRT: failed to map image memory\n");
 172                 return;
 173         }
 174
 175         if (bgrt_image_size < (sizeof(*file_header) + sizeof(*dib_header)))
 176                 goto error;
 177
 178         file_header = bgrt_image;
 179         if (file_header->id != 0x4d42 || file_header->reserved != 0)
 180                 goto error;
 181
 182         dib_header = bgrt_image + sizeof(*file_header);
 183         if (dib_header->dib_header_size != 40 || dib_header->width < 0 ||
 184             dib_header->planes != 1 || dib_header->bpp != 24 ||
 185             dib_header->compression != 0)
 186                 goto error;
 187
 188         bmp_width = dib_header->width;
 189         bmp_height = abs(dib_header->height);
 190         bmp_pitch = round_up(3 * bmp_width, 4);
 191         screen_pitch = si->lfb_linelength;
 192
 193         if ((file_header->bitmap_offset + bmp_pitch * bmp_height) >
 194                                 bgrt_image_size)
 195                 goto error;
 196
 197         if ((bgrt_tab.image_offset_x + bmp_width) > si->lfb_width ||
 198             (bgrt_tab.image_offset_y + bmp_height) > si->lfb_height)
 199                 goto error;
 200
 201         if (!efifb_bgrt_sanity_check(si, bmp_width))
 202                 goto error;
 203
 204         pr_info("efifb: showing boot graphics\n");
 205
 206         for (y = 0; y < si->lfb_height; y++, dst += si->lfb_linelength) {
 207                 /* Only background? */
 208                 if (y < bgrt_tab.image_offset_y ||
 209                     y >= (bgrt_tab.image_offset_y + bmp_height)) {
 210                         memset(dst, 0, 4 * si->lfb_width);
 211                         continue;
 212                 }
 213
 214                 src_y = y - bgrt_tab.image_offset_y;
 215                 /* Positive header height means upside down row order */
 216                 if (dib_header->height > 0)
 217                         src_y = (bmp_height - 1) - src_y;
 218
 219                 memset(dst, 0, bgrt_tab.image_offset_x * 4);
 220                 dst_x = bgrt_tab.image_offset_x;
 221                 efifb_copy_bmp(bgrt_image + file_header->bitmap_offset +
 222                                             src_y * bmp_pitch,
 223                                (u32 *)dst + dst_x, bmp_width, si);
 224                 dst_x += bmp_width;
 225                 memset((u32 *)dst + dst_x, 0, (si->lfb_width - dst_x) * 4);
 226         }
 227
 228         memunmap(bgrt_image);
 229         return;
 230
 231 error:
 232         memunmap(bgrt_image);
 233         pr_warn("efifb: Ignoring BGRT: unexpected or invalid BMP data\n");
 234 }
 235 #else
 236 static inline void efifb_show_boot_graphics(struct fb_info *info) {}
 237 #endif
 238
 239 static void efifb_destroy(struct fb_info *info)
 240 {
 241         if (info->screen_base) {
 242                 if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
 243                         iounmap(info->screen_base);
 244                 else
 245                         memunmap(info->screen_base);
 246         }
 247         if (request_mem_succeeded)
 248                 release_mem_region(info->apertures->ranges[0].base,
 249                                    info->apertures->ranges[0].size);
 250         fb_dealloc_cmap(&info->cmap);
 251 }
 252
 253 static struct fb_ops efifb_ops = {
 254         .owner          = THIS_MODULE,
 255         .fb_destroy     = efifb_destroy,
 256         .fb_setcolreg   = efifb_setcolreg,
 257         .fb_fillrect    = cfb_fillrect,
 258         .fb_copyarea    = cfb_copyarea,
 259         .fb_imageblit   = cfb_imageblit,
 260 };
 261
 262 static int efifb_setup(char *options)
 263 {
 264         char *this_opt;
 265
 266         if (options && *options) {
 267                 while ((this_opt = strsep(&options, ",")) != NULL) {
 268                         if (!*this_opt) continue;
 269
 270                         efifb_setup_from_dmi(&screen_info, this_opt);
 271
 272                         if (!strncmp(this_opt, "base:", 5))
 273                                 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
 274                         else if (!strncmp(this_opt, "stride:", 7))
 275                                 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
 276                         else if (!strncmp(this_opt, "height:", 7))
 277                                 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
 278                         else if (!strncmp(this_opt, "width:", 6))
 279                                 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
 280                         else if (!strcmp(this_opt, "nowc"))
 281                                 mem_flags &= ~EFI_MEMORY_WC;
 282                         else if (!strcmp(this_opt, "nobgrt"))
 283                                 use_bgrt = false;
 284                 }
 285         }
 286
 287         return 0;
 288 }
 289
 290 static inline bool fb_base_is_valid(void)
 291 {
 292         if (screen_info.lfb_base)
 293                 return true;
 294
 295         if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
 296                 return false;
 297
 298         if (screen_info.ext_lfb_base)
 299                 return true;
 300
 301         return false;
 302 }
 303
 304 #define efifb_attr_decl(name, fmt)                                      \
 305 static ssize_t name##_show(struct device *dev,                          \
 306                            struct device_attribute *attr,               \
 307                            char *buf)                                   \
 308 {                                                                       \
 309         return sprintf(buf, fmt "\n", (screen_info.lfb_##name));        \
 310 }                                                                       \
 311 static DEVICE_ATTR_RO(name)
 312
 313 efifb_attr_decl(base, "0x%x");
 314 efifb_attr_decl(linelength, "%u");
 315 efifb_attr_decl(height, "%u");
 316 efifb_attr_decl(width, "%u");
 317 efifb_attr_decl(depth, "%u");
 318
 319 static struct attribute *efifb_attrs[] = {
 320         &dev_attr_base.attr,
 321         &dev_attr_linelength.attr,
 322         &dev_attr_width.attr,
 323         &dev_attr_height.attr,
 324         &dev_attr_depth.attr,
 325         NULL
 326 };
 327 ATTRIBUTE_GROUPS(efifb);
 328
 329 static bool pci_dev_disabled;   /* FB base matches BAR of a disabled device */
 330
 331 static struct pci_dev *efifb_pci_dev;   /* dev with BAR covering the efifb */
 332 static struct resource *bar_resource;
 333 static u64 bar_offset;
 334
 335 static int efifb_probe(struct platform_device *dev)
 336 {
 337         struct fb_info *info;
 338         int err, orientation;
 339         unsigned int size_vmode;
 340         unsigned int size_remap;
 341         unsigned int size_total;
 342         char *option = NULL;
 343         efi_memory_desc_t md;
 344
 345         if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
 346                 return -ENODEV;
 347
 348         if (fb_get_options("efifb", &option))
 349                 return -ENODEV;
 350         efifb_setup(option);
 351
 352         /* We don't get linelength from UGA Draw Protocol, only from
 353          * EFI Graphics Protocol.  So if it's not in DMI, and it's not
 354          * passed in from the user, we really can't use the framebuffer.
 355          */
 356         if (!screen_info.lfb_linelength)
 357                 return -ENODEV;
 358
 359         if (!screen_info.lfb_depth)
 360                 screen_info.lfb_depth = 32;
 361         if (!screen_info.pages)
 362                 screen_info.pages = 1;
 363         if (!fb_base_is_valid()) {
 364                 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
 365                 return -ENODEV;
 366         }
 367         printk(KERN_INFO "efifb: probing for efifb\n");
 368
 369         /* just assume they're all unset if any are */
 370         if (!screen_info.blue_size) {
 371                 screen_info.blue_size = 8;
 372                 screen_info.blue_pos = 0;
 373                 screen_info.green_size = 8;
 374                 screen_info.green_pos = 8;
 375                 screen_info.red_size = 8;
 376                 screen_info.red_pos = 16;
 377                 screen_info.rsvd_size = 8;
 378                 screen_info.rsvd_pos = 24;
 379         }
 380
 381         efifb_fix.smem_start = screen_info.lfb_base;
 382
 383         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
 384                 u64 ext_lfb_base;
 385
 386                 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
 387                 efifb_fix.smem_start |= ext_lfb_base;
 388         }
 389
 390         if (bar_resource &&
 391             bar_resource->start + bar_offset != efifb_fix.smem_start) {
 392                 dev_info(&efifb_pci_dev->dev,
 393                          "BAR has moved, updating efifb address\n");
 394                 efifb_fix.smem_start = bar_resource->start + bar_offset;
 395         }
 396
 397         efifb_defined.bits_per_pixel = screen_info.lfb_depth;
 398         efifb_defined.xres = screen_info.lfb_width;
 399         efifb_defined.yres = screen_info.lfb_height;
 400         efifb_fix.line_length = screen_info.lfb_linelength;
 401
 402         /*   size_vmode -- that is the amount of memory needed for the
 403          *                 used video mode, i.e. the minimum amount of
 404          *                 memory we need. */
 405         size_vmode = efifb_defined.yres * efifb_fix.line_length;
 406
 407         /*   size_total -- all video memory we have. Used for
 408          *                 entries, ressource allocation and bounds
 409          *                 checking. */
 410         size_total = screen_info.lfb_size;
 411         if (size_total < size_vmode)
 412                 size_total = size_vmode;
 413
 414         /*   size_remap -- the amount of video memory we are going to
 415          *                 use for efifb.  With modern cards it is no
 416          *                 option to simply use size_total as that
 417          *                 wastes plenty of kernel address space. */
 418         size_remap  = size_vmode * 2;
 419         if (size_remap > size_total)
 420                 size_remap = size_total;
 421         if (size_remap % PAGE_SIZE)
 422                 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
 423         efifb_fix.smem_len = size_remap;
 424
 425         if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
 426                 request_mem_succeeded = true;
 427         } else {
 428                 /* We cannot make this fatal. Sometimes this comes from magic
 429                    spaces our resource handlers simply don't know about */
 430                 pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
 431                         efifb_fix.smem_start);
 432         }
 433
 434         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 435         if (!info) {
 436                 pr_err("efifb: cannot allocate framebuffer\n");
 437                 err = -ENOMEM;
 438                 goto err_release_mem;
 439         }
 440         platform_set_drvdata(dev, info);
 441         info->pseudo_palette = info->par;
 442         info->par = NULL;
 443
 444         info->apertures = alloc_apertures(1);
 445         if (!info->apertures) {
 446                 err = -ENOMEM;
 447                 goto err_release_fb;
 448         }
 449         info->apertures->ranges[0].base = efifb_fix.smem_start;
 450         info->apertures->ranges[0].size = size_remap;
 451
 452         if (efi_enabled(EFI_MEMMAP) &&
 453             !efi_mem_desc_lookup(efifb_fix.smem_start, &md)) {
 454                 if ((efifb_fix.smem_start + efifb_fix.smem_len) >
 455                     (md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT))) {
 456                         pr_err("efifb: video memory @ 0x%lx spans multiple EFI memory regions\n",
 457                                efifb_fix.smem_start);
 458                         err = -EIO;
 459                         goto err_release_fb;
 460                 }
 461                 /*
 462                  * If the UEFI memory map covers the efifb region, we may only
 463                  * remap it using the attributes the memory map prescribes.
 464                  */
 465                 md.attribute &= EFI_MEMORY_UC | EFI_MEMORY_WC |
 466                                 EFI_MEMORY_WT | EFI_MEMORY_WB;
 467                 if (md.attribute) {
 468                         mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB;
 469                         mem_flags &= md.attribute;
 470                 }
 471         }
 472         if (mem_flags & EFI_MEMORY_WC)
 473                 info->screen_base = ioremap_wc(efifb_fix.smem_start,
 474                                                efifb_fix.smem_len);
 475         else if (mem_flags & EFI_MEMORY_UC)
 476                 info->screen_base = ioremap(efifb_fix.smem_start,
 477                                             efifb_fix.smem_len);
 478         else if (mem_flags & EFI_MEMORY_WT)
 479                 info->screen_base = memremap(efifb_fix.smem_start,
 480                                              efifb_fix.smem_len, MEMREMAP_WT);
 481         else if (mem_flags & EFI_MEMORY_WB)
 482                 info->screen_base = memremap(efifb_fix.smem_start,
 483                                              efifb_fix.smem_len, MEMREMAP_WB);
 484         if (!info->screen_base) {
 485                 pr_err("efifb: abort, cannot remap video memory 0x%x @ 0x%lx\n",
 486                         efifb_fix.smem_len, efifb_fix.smem_start);
 487                 err = -EIO;
 488                 goto err_release_fb;
 489         }
 490
 491         efifb_show_boot_graphics(info);
 492
 493         pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
 494                efifb_fix.smem_start, size_remap/1024, size_total/1024);
 495         pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 496                efifb_defined.xres, efifb_defined.yres,
 497                efifb_defined.bits_per_pixel, efifb_fix.line_length,
 498                screen_info.pages);
 499
 500         efifb_defined.xres_virtual = efifb_defined.xres;
 501         efifb_defined.yres_virtual = efifb_fix.smem_len /
 502                                         efifb_fix.line_length;
 503         pr_info("efifb: scrolling: redraw\n");
 504         efifb_defined.yres_virtual = efifb_defined.yres;
 505
 506         /* some dummy values for timing to make fbset happy */
 507         efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
 508                                         1000 / efifb_defined.yres;
 509         efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
 510         efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;
 511
 512         efifb_defined.red.offset    = screen_info.red_pos;
 513         efifb_defined.red.length    = screen_info.red_size;
 514         efifb_defined.green.offset  = screen_info.green_pos;
 515         efifb_defined.green.length  = screen_info.green_size;
 516         efifb_defined.blue.offset   = screen_info.blue_pos;
 517         efifb_defined.blue.length   = screen_info.blue_size;
 518         efifb_defined.transp.offset = screen_info.rsvd_pos;
 519         efifb_defined.transp.length = screen_info.rsvd_size;
 520
 521         pr_info("efifb: %s: "
 522                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 523                "Truecolor",
 524                screen_info.rsvd_size,
 525                screen_info.red_size,
 526                screen_info.green_size,
 527                screen_info.blue_size,
 528                screen_info.rsvd_pos,
 529                screen_info.red_pos,
 530                screen_info.green_pos,
 531                screen_info.blue_pos);
 532
 533         efifb_fix.ypanstep  = 0;
 534         efifb_fix.ywrapstep = 0;
 535
 536         info->fbops = &efifb_ops;
 537         info->var = efifb_defined;
 538         info->fix = efifb_fix;
 539         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
 540
 541         orientation = drm_get_panel_orientation_quirk(efifb_defined.xres,
 542                                                       efifb_defined.yres);
 543         switch (orientation) {
 544         default:
 545                 info->fbcon_rotate_hint = FB_ROTATE_UR;
 546                 break;
 547         case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
 548                 info->fbcon_rotate_hint = FB_ROTATE_UD;
 549                 break;
 550         case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
 551                 info->fbcon_rotate_hint = FB_ROTATE_CCW;
 552                 break;
 553         case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
 554                 info->fbcon_rotate_hint = FB_ROTATE_CW;
 555                 break;
 556         }
 557
 558         err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
 559         if (err) {
 560                 pr_err("efifb: cannot add sysfs attrs\n");
 561                 goto err_unmap;
 562         }
 563         err = fb_alloc_cmap(&info->cmap, 256, 0);
 564         if (err < 0) {
 565                 pr_err("efifb: cannot allocate colormap\n");
 566                 goto err_groups;
 567         }
 568         err = register_framebuffer(info);
 569         if (err < 0) {
 570                 pr_err("efifb: cannot register framebuffer\n");
 571                 goto err_fb_dealoc;
 572         }
 573         fb_info(info, "%s frame buffer device\n", info->fix.id);
 574         return 0;
 575
 576 err_fb_dealoc:
 577         fb_dealloc_cmap(&info->cmap);
 578 err_groups:
 579         sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
 580 err_unmap:
 581         if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
 582                 iounmap(info->screen_base);
 583         else
 584                 memunmap(info->screen_base);
 585 err_release_fb:
 586         framebuffer_release(info);
 587 err_release_mem:
 588         if (request_mem_succeeded)
 589                 release_mem_region(efifb_fix.smem_start, size_total);
 590         return err;
 591 }
 592
 593 static int efifb_remove(struct platform_device *pdev)
 594 {
 595         struct fb_info *info = platform_get_drvdata(pdev);
 596
 597         unregister_framebuffer(info);
 598         sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
 599         framebuffer_release(info);
 600
 601         return 0;
 602 }
 603
 604 static struct platform_driver efifb_driver = {
 605         .driver = {
 606                 .name = "efi-framebuffer",
 607         },
 608         .probe = efifb_probe,
 609         .remove = efifb_remove,
 610 };
 611
 612 builtin_platform_driver(efifb_driver);
 613
 614 #if defined(CONFIG_PCI)
 615
 616 static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
 617 {
 618         u16 word;
 619
 620         efifb_pci_dev = dev;
 621
 622         pci_read_config_word(dev, PCI_COMMAND, &word);
 623         if (!(word & PCI_COMMAND_MEMORY)) {
 624                 pci_dev_disabled = true;
 625                 dev_err(&dev->dev,
 626                         "BAR %d: assigned to efifb but device is disabled!\n",
 627                         idx);
 628                 return;
 629         }
 630
 631         bar_resource = &dev->resource[idx];
 632         bar_offset = offset;
 633
 634         dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
 635 }
 636
 637 static void efifb_fixup_resources(struct pci_dev *dev)
 638 {
 639         u64 base = screen_info.lfb_base;
 640         u64 size = screen_info.lfb_size;
 641         int i;
 642
 643         if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
 644                 return;
 645
 646         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
 647                 base |= (u64)screen_info.ext_lfb_base << 32;
 648
 649         if (!base)
 650                 return;
 651
 652         for (i = 0; i <= PCI_STD_RESOURCE_END; i++) {
 653                 struct resource *res = &dev->resource[i];
 654
 655                 if (!(res->flags & IORESOURCE_MEM))
 656                         continue;
 657
 658                 if (res->start <= base && res->end >= base + size - 1) {
 659                         record_efifb_bar_resource(dev, i, base - res->start);
 660                         break;
 661                 }
 662         }
 663 }
 664 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
 665                                16, efifb_fixup_resources);
 666
 667 #endif