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, 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         if (bgrt_tab.status & 0x06) {
 158                 pr_info("efifb: BGRT rotation bits set, not showing boot graphics\n");
 159                 return;
 160         }
 161
 162         /* Avoid flashing the logo if we're going to print std probe messages */
 163         if (console_loglevel > CONSOLE_LOGLEVEL_QUIET)
 164                 return;
 165
 166         /* bgrt_tab.status is unreliable, so we don't check it */
 167
 168         if (si->lfb_depth != 32) {
 169                 pr_info("efifb: not 32 bits, not showing boot graphics\n");
 170                 return;
 171         }
 172
 173         bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
 174                               MEMREMAP_WB);
 175         if (!bgrt_image) {
 176                 pr_warn("efifb: Ignoring BGRT: failed to map image memory\n");
 177                 return;
 178         }
 179
 180         if (bgrt_image_size < (sizeof(*file_header) + sizeof(*dib_header)))
 181                 goto error;
 182
 183         file_header = bgrt_image;
 184         if (file_header->id != 0x4d42 || file_header->reserved != 0)
 185                 goto error;
 186
 187         dib_header = bgrt_image + sizeof(*file_header);
 188         if (dib_header->dib_header_size != 40 || dib_header->width < 0 ||
 189             dib_header->planes != 1 || dib_header->bpp != 24 ||
 190             dib_header->compression != 0)
 191                 goto error;
 192
 193         bmp_width = dib_header->width;
 194         bmp_height = abs(dib_header->height);
 195         bmp_pitch = round_up(3 * bmp_width, 4);
 196
 197         if ((file_header->bitmap_offset + bmp_pitch * bmp_height) >
 198                                 bgrt_image_size)
 199                 goto error;
 200
 201         if ((bgrt_tab.image_offset_x + bmp_width) > si->lfb_width ||
 202             (bgrt_tab.image_offset_y + bmp_height) > si->lfb_height)
 203                 goto error;
 204
 205         if (!efifb_bgrt_sanity_check(si, bmp_width))
 206                 goto error;
 207
 208         pr_info("efifb: showing boot graphics\n");
 209
 210         for (y = 0; y < si->lfb_height; y++, dst += si->lfb_linelength) {
 211                 /* Only background? */
 212                 if (y < bgrt_tab.image_offset_y ||
 213                     y >= (bgrt_tab.image_offset_y + bmp_height)) {
 214                         memset(dst, 0, 4 * si->lfb_width);
 215                         continue;
 216                 }
 217
 218                 src_y = y - bgrt_tab.image_offset_y;
 219                 /* Positive header height means upside down row order */
 220                 if (dib_header->height > 0)
 221                         src_y = (bmp_height - 1) - src_y;
 222
 223                 memset(dst, 0, bgrt_tab.image_offset_x * 4);
 224                 dst_x = bgrt_tab.image_offset_x;
 225                 efifb_copy_bmp(bgrt_image + file_header->bitmap_offset +
 226                                             src_y * bmp_pitch,
 227                                (u32 *)dst + dst_x, bmp_width, si);
 228                 dst_x += bmp_width;
 229                 memset((u32 *)dst + dst_x, 0, (si->lfb_width - dst_x) * 4);
 230         }
 231
 232         memunmap(bgrt_image);
 233         return;
 234
 235 error:
 236         memunmap(bgrt_image);
 237         pr_warn("efifb: Ignoring BGRT: unexpected or invalid BMP data\n");
 238 }
 239 #else
 240 static inline void efifb_show_boot_graphics(struct fb_info *info) {}
 241 #endif
 242
 243 static void efifb_destroy(struct fb_info *info)
 244 {
 245         if (info->screen_base) {
 246                 if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
 247                         iounmap(info->screen_base);
 248                 else
 249                         memunmap(info->screen_base);
 250         }
 251         if (request_mem_succeeded)
 252                 release_mem_region(info->apertures->ranges[0].base,
 253                                    info->apertures->ranges[0].size);
 254         fb_dealloc_cmap(&info->cmap);
 255 }
 256
 257 static const struct fb_ops efifb_ops = {
 258         .owner          = THIS_MODULE,
 259         .fb_destroy     = efifb_destroy,
 260         .fb_setcolreg   = efifb_setcolreg,
 261         .fb_fillrect    = cfb_fillrect,
 262         .fb_copyarea    = cfb_copyarea,
 263         .fb_imageblit   = cfb_imageblit,
 264 };
 265
 266 static int efifb_setup(char *options)
 267 {
 268         char *this_opt;
 269
 270         if (options && *options) {
 271                 while ((this_opt = strsep(&options, ",")) != NULL) {
 272                         if (!*this_opt) continue;
 273
 274                         efifb_setup_from_dmi(&screen_info, this_opt);
 275
 276                         if (!strncmp(this_opt, "base:", 5))
 277                                 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
 278                         else if (!strncmp(this_opt, "stride:", 7))
 279                                 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
 280                         else if (!strncmp(this_opt, "height:", 7))
 281                                 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
 282                         else if (!strncmp(this_opt, "width:", 6))
 283                                 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
 284                         else if (!strcmp(this_opt, "nowc"))
 285                                 mem_flags &= ~EFI_MEMORY_WC;
 286                         else if (!strcmp(this_opt, "nobgrt"))
 287                                 use_bgrt = false;
 288                 }
 289         }
 290
 291         return 0;
 292 }
 293
 294 static inline bool fb_base_is_valid(void)
 295 {
 296         if (screen_info.lfb_base)
 297                 return true;
 298
 299         if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
 300                 return false;
 301
 302         if (screen_info.ext_lfb_base)
 303                 return true;
 304
 305         return false;
 306 }
 307
 308 #define efifb_attr_decl(name, fmt)                                      \
 309 static ssize_t name##_show(struct device *dev,                          \
 310                            struct device_attribute *attr,               \
 311                            char *buf)                                   \
 312 {                                                                       \
 313         return sprintf(buf, fmt "\n", (screen_info.lfb_##name));        \
 314 }                                                                       \
 315 static DEVICE_ATTR_RO(name)
 316
 317 efifb_attr_decl(base, "0x%x");
 318 efifb_attr_decl(linelength, "%u");
 319 efifb_attr_decl(height, "%u");
 320 efifb_attr_decl(width, "%u");
 321 efifb_attr_decl(depth, "%u");
 322
 323 static struct attribute *efifb_attrs[] = {
 324         &dev_attr_base.attr,
 325         &dev_attr_linelength.attr,
 326         &dev_attr_width.attr,
 327         &dev_attr_height.attr,
 328         &dev_attr_depth.attr,
 329         NULL
 330 };
 331 ATTRIBUTE_GROUPS(efifb);
 332
 333 static bool pci_dev_disabled;   /* FB base matches BAR of a disabled device */
 334
 335 static struct pci_dev *efifb_pci_dev;   /* dev with BAR covering the efifb */
 336 static struct resource *bar_resource;
 337 static u64 bar_offset;
 338
 339 static int efifb_probe(struct platform_device *dev)
 340 {
 341         struct fb_info *info;
 342         int err, orientation;
 343         unsigned int size_vmode;
 344         unsigned int size_remap;
 345         unsigned int size_total;
 346         char *option = NULL;
 347         efi_memory_desc_t md;
 348
 349         if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
 350                 return -ENODEV;
 351
 352         if (fb_get_options("efifb", &option))
 353                 return -ENODEV;
 354         efifb_setup(option);
 355
 356         /* We don't get linelength from UGA Draw Protocol, only from
 357          * EFI Graphics Protocol.  So if it's not in DMI, and it's not
 358          * passed in from the user, we really can't use the framebuffer.
 359          */
 360         if (!screen_info.lfb_linelength)
 361                 return -ENODEV;
 362
 363         if (!screen_info.lfb_depth)
 364                 screen_info.lfb_depth = 32;
 365         if (!screen_info.pages)
 366                 screen_info.pages = 1;
 367         if (!fb_base_is_valid()) {
 368                 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
 369                 return -ENODEV;
 370         }
 371         printk(KERN_INFO "efifb: probing for efifb\n");
 372
 373         /* just assume they're all unset if any are */
 374         if (!screen_info.blue_size) {
 375                 screen_info.blue_size = 8;
 376                 screen_info.blue_pos = 0;
 377                 screen_info.green_size = 8;
 378                 screen_info.green_pos = 8;
 379                 screen_info.red_size = 8;
 380                 screen_info.red_pos = 16;
 381                 screen_info.rsvd_size = 8;
 382                 screen_info.rsvd_pos = 24;
 383         }
 384
 385         efifb_fix.smem_start = screen_info.lfb_base;
 386
 387         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
 388                 u64 ext_lfb_base;
 389
 390                 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
 391                 efifb_fix.smem_start |= ext_lfb_base;
 392         }
 393
 394         if (bar_resource &&
 395             bar_resource->start + bar_offset != efifb_fix.smem_start) {
 396                 dev_info(&efifb_pci_dev->dev,
 397                          "BAR has moved, updating efifb address\n");
 398                 efifb_fix.smem_start = bar_resource->start + bar_offset;
 399         }
 400
 401         efifb_defined.bits_per_pixel = screen_info.lfb_depth;
 402         efifb_defined.xres = screen_info.lfb_width;
 403         efifb_defined.yres = screen_info.lfb_height;
 404         efifb_fix.line_length = screen_info.lfb_linelength;
 405
 406         /*   size_vmode -- that is the amount of memory needed for the
 407          *                 used video mode, i.e. the minimum amount of
 408          *                 memory we need. */
 409         size_vmode = efifb_defined.yres * efifb_fix.line_length;
 410
 411         /*   size_total -- all video memory we have. Used for
 412          *                 entries, ressource allocation and bounds
 413          *                 checking. */
 414         size_total = screen_info.lfb_size;
 415         if (size_total < size_vmode)
 416                 size_total = size_vmode;
 417
 418         /*   size_remap -- the amount of video memory we are going to
 419          *                 use for efifb.  With modern cards it is no
 420          *                 option to simply use size_total as that
 421          *                 wastes plenty of kernel address space. */
 422         size_remap  = size_vmode * 2;
 423         if (size_remap > size_total)
 424                 size_remap = size_total;
 425         if (size_remap % PAGE_SIZE)
 426                 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
 427         efifb_fix.smem_len = size_remap;
 428
 429         if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
 430                 request_mem_succeeded = true;
 431         } else {
 432                 /* We cannot make this fatal. Sometimes this comes from magic
 433                    spaces our resource handlers simply don't know about */
 434                 pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
 435                         efifb_fix.smem_start);
 436         }
 437
 438         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 439         if (!info) {
 440                 err = -ENOMEM;
 441                 goto err_release_mem;
 442         }
 443         platform_set_drvdata(dev, info);
 444         info->pseudo_palette = info->par;
 445         info->par = NULL;
 446
 447         info->apertures = alloc_apertures(1);
 448         if (!info->apertures) {
 449                 err = -ENOMEM;
 450                 goto err_release_fb;
 451         }
 452         info->apertures->ranges[0].base = efifb_fix.smem_start;
 453         info->apertures->ranges[0].size = size_remap;
 454
 455         if (efi_enabled(EFI_MEMMAP) &&
 456             !efi_mem_desc_lookup(efifb_fix.smem_start, &md)) {
 457                 if ((efifb_fix.smem_start + efifb_fix.smem_len) >
 458                     (md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT))) {
 459                         pr_err("efifb: video memory @ 0x%lx spans multiple EFI memory regions\n",
 460                                efifb_fix.smem_start);
 461                         err = -EIO;
 462                         goto err_release_fb;
 463                 }
 464                 /*
 465                  * If the UEFI memory map covers the efifb region, we may only
 466                  * remap it using the attributes the memory map prescribes.
 467                  */
 468                 md.attribute &= EFI_MEMORY_UC | EFI_MEMORY_WC |
 469                                 EFI_MEMORY_WT | EFI_MEMORY_WB;
 470                 if (md.attribute) {
 471                         mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB;
 472                         mem_flags &= md.attribute;
 473                 }
 474         }
 475         if (mem_flags & EFI_MEMORY_WC)
 476                 info->screen_base = ioremap_wc(efifb_fix.smem_start,
 477                                                efifb_fix.smem_len);
 478         else if (mem_flags & EFI_MEMORY_UC)
 479                 info->screen_base = ioremap(efifb_fix.smem_start,
 480                                             efifb_fix.smem_len);
 481         else if (mem_flags & EFI_MEMORY_WT)
 482                 info->screen_base = memremap(efifb_fix.smem_start,
 483                                              efifb_fix.smem_len, MEMREMAP_WT);
 484         else if (mem_flags & EFI_MEMORY_WB)
 485                 info->screen_base = memremap(efifb_fix.smem_start,
 486                                              efifb_fix.smem_len, MEMREMAP_WB);
 487         if (!info->screen_base) {
 488                 pr_err("efifb: abort, cannot remap video memory 0x%x @ 0x%lx\n",
 489                         efifb_fix.smem_len, efifb_fix.smem_start);
 490                 err = -EIO;
 491                 goto err_release_fb;
 492         }
 493
 494         efifb_show_boot_graphics(info);
 495
 496         pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
 497                efifb_fix.smem_start, size_remap/1024, size_total/1024);
 498         pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 499                efifb_defined.xres, efifb_defined.yres,
 500                efifb_defined.bits_per_pixel, efifb_fix.line_length,
 501                screen_info.pages);
 502
 503         efifb_defined.xres_virtual = efifb_defined.xres;
 504         efifb_defined.yres_virtual = efifb_fix.smem_len /
 505                                         efifb_fix.line_length;
 506         pr_info("efifb: scrolling: redraw\n");
 507         efifb_defined.yres_virtual = efifb_defined.yres;
 508
 509         /* some dummy values for timing to make fbset happy */
 510         efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
 511                                         1000 / efifb_defined.yres;
 512         efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
 513         efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;
 514
 515         efifb_defined.red.offset    = screen_info.red_pos;
 516         efifb_defined.red.length    = screen_info.red_size;
 517         efifb_defined.green.offset  = screen_info.green_pos;
 518         efifb_defined.green.length  = screen_info.green_size;
 519         efifb_defined.blue.offset   = screen_info.blue_pos;
 520         efifb_defined.blue.length   = screen_info.blue_size;
 521         efifb_defined.transp.offset = screen_info.rsvd_pos;
 522         efifb_defined.transp.length = screen_info.rsvd_size;
 523
 524         pr_info("efifb: %s: "
 525                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 526                "Truecolor",
 527                screen_info.rsvd_size,
 528                screen_info.red_size,
 529                screen_info.green_size,
 530                screen_info.blue_size,
 531                screen_info.rsvd_pos,
 532                screen_info.red_pos,
 533                screen_info.green_pos,
 534                screen_info.blue_pos);
 535
 536         efifb_fix.ypanstep  = 0;
 537         efifb_fix.ywrapstep = 0;
 538
 539         info->fbops = &efifb_ops;
 540         info->var = efifb_defined;
 541         info->fix = efifb_fix;
 542         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
 543
 544         orientation = drm_get_panel_orientation_quirk(efifb_defined.xres,
 545                                                       efifb_defined.yres);
 546         switch (orientation) {
 547         default:
 548                 info->fbcon_rotate_hint = FB_ROTATE_UR;
 549                 break;
 550         case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
 551                 info->fbcon_rotate_hint = FB_ROTATE_UD;
 552                 break;
 553         case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
 554                 info->fbcon_rotate_hint = FB_ROTATE_CCW;
 555                 break;
 556         case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
 557                 info->fbcon_rotate_hint = FB_ROTATE_CW;
 558                 break;
 559         }
 560
 561         err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
 562         if (err) {
 563                 pr_err("efifb: cannot add sysfs attrs\n");
 564                 goto err_unmap;
 565         }
 566         err = fb_alloc_cmap(&info->cmap, 256, 0);
 567         if (err < 0) {
 568                 pr_err("efifb: cannot allocate colormap\n");
 569                 goto err_groups;
 570         }
 571         err = register_framebuffer(info);
 572         if (err < 0) {
 573                 pr_err("efifb: cannot register framebuffer\n");
 574                 goto err_fb_dealoc;
 575         }
 576         fb_info(info, "%s frame buffer device\n", info->fix.id);
 577         return 0;
 578
 579 err_fb_dealoc:
 580         fb_dealloc_cmap(&info->cmap);
 581 err_groups:
 582         sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
 583 err_unmap:
 584         if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
 585                 iounmap(info->screen_base);
 586         else
 587                 memunmap(info->screen_base);
 588 err_release_fb:
 589         framebuffer_release(info);
 590 err_release_mem:
 591         if (request_mem_succeeded)
 592                 release_mem_region(efifb_fix.smem_start, size_total);
 593         return err;
 594 }
 595
 596 static int efifb_remove(struct platform_device *pdev)
 597 {
 598         struct fb_info *info = platform_get_drvdata(pdev);
 599
 600         unregister_framebuffer(info);
 601         sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
 602         framebuffer_release(info);
 603
 604         return 0;
 605 }
 606
 607 static struct platform_driver efifb_driver = {
 608         .driver = {
 609                 .name = "efi-framebuffer",
 610         },
 611         .probe = efifb_probe,
 612         .remove = efifb_remove,
 613 };
 614
 615 builtin_platform_driver(efifb_driver);
 616
 617 #if defined(CONFIG_PCI)
 618
 619 static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
 620 {
 621         u16 word;
 622
 623         efifb_pci_dev = dev;
 624
 625         pci_read_config_word(dev, PCI_COMMAND, &word);
 626         if (!(word & PCI_COMMAND_MEMORY)) {
 627                 pci_dev_disabled = true;
 628                 dev_err(&dev->dev,
 629                         "BAR %d: assigned to efifb but device is disabled!\n",
 630                         idx);
 631                 return;
 632         }
 633
 634         bar_resource = &dev->resource[idx];
 635         bar_offset = offset;
 636
 637         dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
 638 }
 639
 640 static void efifb_fixup_resources(struct pci_dev *dev)
 641 {
 642         u64 base = screen_info.lfb_base;
 643         u64 size = screen_info.lfb_size;
 644         int i;
 645
 646         if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
 647                 return;
 648
 649         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
 650                 base |= (u64)screen_info.ext_lfb_base << 32;
 651
 652         if (!base)
 653                 return;
 654
 655         for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 656                 struct resource *res = &dev->resource[i];
 657
 658                 if (!(res->flags & IORESOURCE_MEM))
 659                         continue;
 660
 661                 if (res->start <= base && res->end >= base + size - 1) {
 662                         record_efifb_bar_resource(dev, i, base - res->start);
 663                         break;
 664                 }
 665         }
 666 }
 667 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
 668                                16, efifb_fixup_resources);
 669
 670 #endif