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 <linux/pm_runtime.h>
  20 #include <video/vga.h>
  21 #include <asm/efi.h>
  22 #include <drm/drm_utils.h> /* For drm_get_panel_orientation_quirk */
  23 #include <drm/drm_connector.h>  /* For DRM_MODE_PANEL_ORIENTATION_* */
  24
  25 struct bmp_file_header {
  26         u16 id;
  27         u32 file_size;
  28         u32 reserved;
  29         u32 bitmap_offset;
  30 } __packed;
  31
  32 struct bmp_dib_header {
  33         u32 dib_header_size;
  34         s32 width;
  35         s32 height;
  36         u16 planes;
  37         u16 bpp;
  38         u32 compression;
  39         u32 bitmap_size;
  40         u32 horz_resolution;
  41         u32 vert_resolution;
  42         u32 colors_used;
  43         u32 colors_important;
  44 } __packed;
  45
  46 static bool use_bgrt = true;
  47 static bool request_mem_succeeded = false;
  48 static u64 mem_flags = EFI_MEMORY_WC | EFI_MEMORY_UC;
  49
  50 static struct pci_dev *efifb_pci_dev;   /* dev with BAR covering the efifb */
  51
  52 static struct fb_var_screeninfo efifb_defined = {
  53         .activate               = FB_ACTIVATE_NOW,
  54         .height                 = -1,
  55         .width                  = -1,
  56         .right_margin           = 32,
  57         .upper_margin           = 16,
  58         .lower_margin           = 4,
  59         .vsync_len              = 4,
  60         .vmode                  = FB_VMODE_NONINTERLACED,
  61 };
  62
  63 static struct fb_fix_screeninfo efifb_fix = {
  64         .id                     = "EFI VGA",
  65         .type                   = FB_TYPE_PACKED_PIXELS,
  66         .accel                  = FB_ACCEL_NONE,
  67         .visual                 = FB_VISUAL_TRUECOLOR,
  68 };
  69
  70 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
  71                            unsigned blue, unsigned transp,
  72                            struct fb_info *info)
  73 {
  74         /*
  75          *  Set a single color register. The values supplied are
  76          *  already rounded down to the hardware's capabilities
  77          *  (according to the entries in the `var' structure). Return
  78          *  != 0 for invalid regno.
  79          */
  80
  81         if (regno >= info->cmap.len)
  82                 return 1;
  83
  84         if (regno < 16) {
  85                 red   >>= 16 - info->var.red.length;
  86                 green >>= 16 - info->var.green.length;
  87                 blue  >>= 16 - info->var.blue.length;
  88                 ((u32 *)(info->pseudo_palette))[regno] =
  89                         (red   << info->var.red.offset)   |
  90                         (green << info->var.green.offset) |
  91                         (blue  << info->var.blue.offset);
  92         }
  93         return 0;
  94 }
  95
  96 /*
  97  * If fbcon deffered console takeover is configured, the intent is for the
  98  * framebuffer to show the boot graphics (e.g. vendor logo) until there is some
  99  * (error) message to display. But the boot graphics may have been destroyed by
 100  * e.g. option ROM output, detect this and restore the boot graphics.
 101  */
 102 #if defined CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER && \
 103     defined CONFIG_ACPI_BGRT
 104 static void efifb_copy_bmp(u8 *src, u32 *dst, int width, struct screen_info *si)
 105 {
 106         u8 r, g, b;
 107
 108         while (width--) {
 109                 b = *src++;
 110                 g = *src++;
 111                 r = *src++;
 112                 *dst++ = (r << si->red_pos)   |
 113                          (g << si->green_pos) |
 114                          (b << si->blue_pos);
 115         }
 116 }
 117
 118 #ifdef CONFIG_X86
 119 /*
 120  * On x86 some firmwares use a low non native resolution for the display when
 121  * they have shown some text messages. While keeping the bgrt filled with info
 122  * for the native resolution. If the bgrt image intended for the native
 123  * resolution still fits, it will be displayed very close to the right edge of
 124  * the display looking quite bad. This function checks for this.
 125  */
 126 static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
 127 {
 128         /*
 129          * All x86 firmwares horizontally center the image (the yoffset
 130          * calculations differ between boards, but xoffset is predictable).
 131          */
 132         u32 expected_xoffset = (si->lfb_width - bmp_width) / 2;
 133
 134         return bgrt_tab.image_offset_x == expected_xoffset;
 135 }
 136 #else
 137 static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
 138 {
 139         return true;
 140 }
 141 #endif
 142
 143 static void efifb_show_boot_graphics(struct fb_info *info)
 144 {
 145         u32 bmp_width, bmp_height, bmp_pitch, dst_x, y, src_y;
 146         struct screen_info *si = &screen_info;
 147         struct bmp_file_header *file_header;
 148         struct bmp_dib_header *dib_header;
 149         void *bgrt_image = NULL;
 150         u8 *dst = info->screen_base;
 151
 152         if (!use_bgrt)
 153                 return;
 154
 155         if (!bgrt_tab.image_address) {
 156                 pr_info("efifb: No BGRT, not showing boot graphics\n");
 157                 return;
 158         }
 159
 160         if (bgrt_tab.status & 0x06) {
 161                 pr_info("efifb: BGRT rotation bits set, not showing boot graphics\n");
 162                 return;
 163         }
 164
 165         /* Avoid flashing the logo if we're going to print std probe messages */
 166         if (console_loglevel > CONSOLE_LOGLEVEL_QUIET)
 167                 return;
 168
 169         /* bgrt_tab.status is unreliable, so we don't check it */
 170
 171         if (si->lfb_depth != 32) {
 172                 pr_info("efifb: not 32 bits, not showing boot graphics\n");
 173                 return;
 174         }
 175
 176         bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
 177                               MEMREMAP_WB);
 178         if (!bgrt_image) {
 179                 pr_warn("efifb: Ignoring BGRT: failed to map image memory\n");
 180                 return;
 181         }
 182
 183         if (bgrt_image_size < (sizeof(*file_header) + sizeof(*dib_header)))
 184                 goto error;
 185
 186         file_header = bgrt_image;
 187         if (file_header->id != 0x4d42 || file_header->reserved != 0)
 188                 goto error;
 189
 190         dib_header = bgrt_image + sizeof(*file_header);
 191         if (dib_header->dib_header_size != 40 || dib_header->width < 0 ||
 192             dib_header->planes != 1 || dib_header->bpp != 24 ||
 193             dib_header->compression != 0)
 194                 goto error;
 195
 196         bmp_width = dib_header->width;
 197         bmp_height = abs(dib_header->height);
 198         bmp_pitch = round_up(3 * bmp_width, 4);
 199
 200         if ((file_header->bitmap_offset + bmp_pitch * bmp_height) >
 201                                 bgrt_image_size)
 202                 goto error;
 203
 204         if ((bgrt_tab.image_offset_x + bmp_width) > si->lfb_width ||
 205             (bgrt_tab.image_offset_y + bmp_height) > si->lfb_height)
 206                 goto error;
 207
 208         if (!efifb_bgrt_sanity_check(si, bmp_width))
 209                 goto error;
 210
 211         pr_info("efifb: showing boot graphics\n");
 212
 213         for (y = 0; y < si->lfb_height; y++, dst += si->lfb_linelength) {
 214                 /* Only background? */
 215                 if (y < bgrt_tab.image_offset_y ||
 216                     y >= (bgrt_tab.image_offset_y + bmp_height)) {
 217                         memset(dst, 0, 4 * si->lfb_width);
 218                         continue;
 219                 }
 220
 221                 src_y = y - bgrt_tab.image_offset_y;
 222                 /* Positive header height means upside down row order */
 223                 if (dib_header->height > 0)
 224                         src_y = (bmp_height - 1) - src_y;
 225
 226                 memset(dst, 0, bgrt_tab.image_offset_x * 4);
 227                 dst_x = bgrt_tab.image_offset_x;
 228                 efifb_copy_bmp(bgrt_image + file_header->bitmap_offset +
 229                                             src_y * bmp_pitch,
 230                                (u32 *)dst + dst_x, bmp_width, si);
 231                 dst_x += bmp_width;
 232                 memset((u32 *)dst + dst_x, 0, (si->lfb_width - dst_x) * 4);
 233         }
 234
 235         memunmap(bgrt_image);
 236         return;
 237
 238 error:
 239         memunmap(bgrt_image);
 240         pr_warn("efifb: Ignoring BGRT: unexpected or invalid BMP data\n");
 241 }
 242 #else
 243 static inline void efifb_show_boot_graphics(struct fb_info *info) {}
 244 #endif
 245
 246 /*
 247  * fb_ops.fb_destroy is called by the last put_fb_info() call at the end
 248  * of unregister_framebuffer() or fb_release(). Do any cleanup here.
 249  */
 250 static void efifb_destroy(struct fb_info *info)
 251 {
 252         if (efifb_pci_dev)
 253                 pm_runtime_put(&efifb_pci_dev->dev);
 254
 255         if (info->screen_base) {
 256                 if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
 257                         iounmap(info->screen_base);
 258                 else
 259                         memunmap(info->screen_base);
 260         }
 261
 262         if (request_mem_succeeded)
 263                 release_mem_region(info->apertures->ranges[0].base,
 264                                    info->apertures->ranges[0].size);
 265         fb_dealloc_cmap(&info->cmap);
 266
 267         framebuffer_release(info);
 268 }
 269
 270 static const struct fb_ops efifb_ops = {
 271         .owner          = THIS_MODULE,
 272         .fb_destroy     = efifb_destroy,
 273         .fb_setcolreg   = efifb_setcolreg,
 274         .fb_fillrect    = cfb_fillrect,
 275         .fb_copyarea    = cfb_copyarea,
 276         .fb_imageblit   = cfb_imageblit,
 277 };
 278
 279 static int efifb_setup(char *options)
 280 {
 281         char *this_opt;
 282
 283         if (options && *options) {
 284                 while ((this_opt = strsep(&options, ",")) != NULL) {
 285                         if (!*this_opt) continue;
 286
 287                         efifb_setup_from_dmi(&screen_info, this_opt);
 288
 289                         if (!strncmp(this_opt, "base:", 5))
 290                                 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
 291                         else if (!strncmp(this_opt, "stride:", 7))
 292                                 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
 293                         else if (!strncmp(this_opt, "height:", 7))
 294                                 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
 295                         else if (!strncmp(this_opt, "width:", 6))
 296                                 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
 297                         else if (!strcmp(this_opt, "nowc"))
 298                                 mem_flags &= ~EFI_MEMORY_WC;
 299                         else if (!strcmp(this_opt, "nobgrt"))
 300                                 use_bgrt = false;
 301                 }
 302         }
 303
 304         return 0;
 305 }
 306
 307 static inline bool fb_base_is_valid(void)
 308 {
 309         if (screen_info.lfb_base)
 310                 return true;
 311
 312         if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
 313                 return false;
 314
 315         if (screen_info.ext_lfb_base)
 316                 return true;
 317
 318         return false;
 319 }
 320
 321 #define efifb_attr_decl(name, fmt)                                      \
 322 static ssize_t name##_show(struct device *dev,                          \
 323                            struct device_attribute *attr,               \
 324                            char *buf)                                   \
 325 {                                                                       \
 326         return sprintf(buf, fmt "\n", (screen_info.lfb_##name));        \
 327 }                                                                       \
 328 static DEVICE_ATTR_RO(name)
 329
 330 efifb_attr_decl(base, "0x%x");
 331 efifb_attr_decl(linelength, "%u");
 332 efifb_attr_decl(height, "%u");
 333 efifb_attr_decl(width, "%u");
 334 efifb_attr_decl(depth, "%u");
 335
 336 static struct attribute *efifb_attrs[] = {
 337         &dev_attr_base.attr,
 338         &dev_attr_linelength.attr,
 339         &dev_attr_width.attr,
 340         &dev_attr_height.attr,
 341         &dev_attr_depth.attr,
 342         NULL
 343 };
 344 ATTRIBUTE_GROUPS(efifb);
 345
 346 static bool pci_dev_disabled;   /* FB base matches BAR of a disabled device */
 347
 348 static struct resource *bar_resource;
 349 static u64 bar_offset;
 350
 351 static int efifb_probe(struct platform_device *dev)
 352 {
 353         struct fb_info *info;
 354         int err, orientation;
 355         unsigned int size_vmode;
 356         unsigned int size_remap;
 357         unsigned int size_total;
 358         char *option = NULL;
 359         efi_memory_desc_t md;
 360
 361         /*
 362          * Generic drivers must not be registered if a framebuffer exists.
 363          * If a native driver was probed, the display hardware was already
 364          * taken and attempting to use the system framebuffer is dangerous.
 365          */
 366         if (num_registered_fb > 0) {
 367                 dev_err(&dev->dev,
 368                         "efifb: a framebuffer is already registered\n");
 369                 return -EINVAL;
 370         }
 371
 372         if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
 373                 return -ENODEV;
 374
 375         if (fb_get_options("efifb", &option))
 376                 return -ENODEV;
 377         efifb_setup(option);
 378
 379         /* We don't get linelength from UGA Draw Protocol, only from
 380          * EFI Graphics Protocol.  So if it's not in DMI, and it's not
 381          * passed in from the user, we really can't use the framebuffer.
 382          */
 383         if (!screen_info.lfb_linelength)
 384                 return -ENODEV;
 385
 386         if (!screen_info.lfb_depth)
 387                 screen_info.lfb_depth = 32;
 388         if (!screen_info.pages)
 389                 screen_info.pages = 1;
 390         if (!fb_base_is_valid()) {
 391                 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
 392                 return -ENODEV;
 393         }
 394         printk(KERN_INFO "efifb: probing for efifb\n");
 395
 396         /* just assume they're all unset if any are */
 397         if (!screen_info.blue_size) {
 398                 screen_info.blue_size = 8;
 399                 screen_info.blue_pos = 0;
 400                 screen_info.green_size = 8;
 401                 screen_info.green_pos = 8;
 402                 screen_info.red_size = 8;
 403                 screen_info.red_pos = 16;
 404                 screen_info.rsvd_size = 8;
 405                 screen_info.rsvd_pos = 24;
 406         }
 407
 408         efifb_fix.smem_start = screen_info.lfb_base;
 409
 410         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
 411                 u64 ext_lfb_base;
 412
 413                 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
 414                 efifb_fix.smem_start |= ext_lfb_base;
 415         }
 416
 417         if (bar_resource &&
 418             bar_resource->start + bar_offset != efifb_fix.smem_start) {
 419                 dev_info(&efifb_pci_dev->dev,
 420                          "BAR has moved, updating efifb address\n");
 421                 efifb_fix.smem_start = bar_resource->start + bar_offset;
 422         }
 423
 424         efifb_defined.bits_per_pixel = screen_info.lfb_depth;
 425         efifb_defined.xres = screen_info.lfb_width;
 426         efifb_defined.yres = screen_info.lfb_height;
 427         efifb_fix.line_length = screen_info.lfb_linelength;
 428
 429         /*   size_vmode -- that is the amount of memory needed for the
 430          *                 used video mode, i.e. the minimum amount of
 431          *                 memory we need. */
 432         size_vmode = efifb_defined.yres * efifb_fix.line_length;
 433
 434         /*   size_total -- all video memory we have. Used for
 435          *                 entries, ressource allocation and bounds
 436          *                 checking. */
 437         size_total = screen_info.lfb_size;
 438         if (size_total < size_vmode)
 439                 size_total = size_vmode;
 440
 441         /*   size_remap -- the amount of video memory we are going to
 442          *                 use for efifb.  With modern cards it is no
 443          *                 option to simply use size_total as that
 444          *                 wastes plenty of kernel address space. */
 445         size_remap  = size_vmode * 2;
 446         if (size_remap > size_total)
 447                 size_remap = size_total;
 448         if (size_remap % PAGE_SIZE)
 449                 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
 450         efifb_fix.smem_len = size_remap;
 451
 452         if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
 453                 request_mem_succeeded = true;
 454         } else {
 455                 /* We cannot make this fatal. Sometimes this comes from magic
 456                    spaces our resource handlers simply don't know about */
 457                 pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
 458                         efifb_fix.smem_start);
 459         }
 460
 461         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 462         if (!info) {
 463                 err = -ENOMEM;
 464                 goto err_release_mem;
 465         }
 466         platform_set_drvdata(dev, info);
 467         info->pseudo_palette = info->par;
 468         info->par = NULL;
 469
 470         info->apertures = alloc_apertures(1);
 471         if (!info->apertures) {
 472                 err = -ENOMEM;
 473                 goto err_release_fb;
 474         }
 475         info->apertures->ranges[0].base = efifb_fix.smem_start;
 476         info->apertures->ranges[0].size = size_remap;
 477
 478         if (efi_enabled(EFI_MEMMAP) &&
 479             !efi_mem_desc_lookup(efifb_fix.smem_start, &md)) {
 480                 if ((efifb_fix.smem_start + efifb_fix.smem_len) >
 481                     (md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT))) {
 482                         pr_err("efifb: video memory @ 0x%lx spans multiple EFI memory regions\n",
 483                                efifb_fix.smem_start);
 484                         err = -EIO;
 485                         goto err_release_fb;
 486                 }
 487                 /*
 488                  * If the UEFI memory map covers the efifb region, we may only
 489                  * remap it using the attributes the memory map prescribes.
 490                  */
 491                 md.attribute &= EFI_MEMORY_UC | EFI_MEMORY_WC |
 492                                 EFI_MEMORY_WT | EFI_MEMORY_WB;
 493                 if (md.attribute) {
 494                         mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB;
 495                         mem_flags &= md.attribute;
 496                 }
 497         }
 498         if (mem_flags & EFI_MEMORY_WC)
 499                 info->screen_base = ioremap_wc(efifb_fix.smem_start,
 500                                                efifb_fix.smem_len);
 501         else if (mem_flags & EFI_MEMORY_UC)
 502                 info->screen_base = ioremap(efifb_fix.smem_start,
 503                                             efifb_fix.smem_len);
 504         else if (mem_flags & EFI_MEMORY_WT)
 505                 info->screen_base = memremap(efifb_fix.smem_start,
 506                                              efifb_fix.smem_len, MEMREMAP_WT);
 507         else if (mem_flags & EFI_MEMORY_WB)
 508                 info->screen_base = memremap(efifb_fix.smem_start,
 509                                              efifb_fix.smem_len, MEMREMAP_WB);
 510         if (!info->screen_base) {
 511                 pr_err("efifb: abort, cannot remap video memory 0x%x @ 0x%lx\n",
 512                         efifb_fix.smem_len, efifb_fix.smem_start);
 513                 err = -EIO;
 514                 goto err_release_fb;
 515         }
 516
 517         efifb_show_boot_graphics(info);
 518
 519         pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
 520                efifb_fix.smem_start, size_remap/1024, size_total/1024);
 521         pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 522                efifb_defined.xres, efifb_defined.yres,
 523                efifb_defined.bits_per_pixel, efifb_fix.line_length,
 524                screen_info.pages);
 525
 526         efifb_defined.xres_virtual = efifb_defined.xres;
 527         efifb_defined.yres_virtual = efifb_fix.smem_len /
 528                                         efifb_fix.line_length;
 529         pr_info("efifb: scrolling: redraw\n");
 530         efifb_defined.yres_virtual = efifb_defined.yres;
 531
 532         /* some dummy values for timing to make fbset happy */
 533         efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
 534                                         1000 / efifb_defined.yres;
 535         efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
 536         efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;
 537
 538         efifb_defined.red.offset    = screen_info.red_pos;
 539         efifb_defined.red.length    = screen_info.red_size;
 540         efifb_defined.green.offset  = screen_info.green_pos;
 541         efifb_defined.green.length  = screen_info.green_size;
 542         efifb_defined.blue.offset   = screen_info.blue_pos;
 543         efifb_defined.blue.length   = screen_info.blue_size;
 544         efifb_defined.transp.offset = screen_info.rsvd_pos;
 545         efifb_defined.transp.length = screen_info.rsvd_size;
 546
 547         pr_info("efifb: %s: "
 548                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 549                "Truecolor",
 550                screen_info.rsvd_size,
 551                screen_info.red_size,
 552                screen_info.green_size,
 553                screen_info.blue_size,
 554                screen_info.rsvd_pos,
 555                screen_info.red_pos,
 556                screen_info.green_pos,
 557                screen_info.blue_pos);
 558
 559         efifb_fix.ypanstep  = 0;
 560         efifb_fix.ywrapstep = 0;
 561
 562         info->fbops = &efifb_ops;
 563         info->var = efifb_defined;
 564         info->fix = efifb_fix;
 565         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
 566
 567         orientation = drm_get_panel_orientation_quirk(efifb_defined.xres,
 568                                                       efifb_defined.yres);
 569         switch (orientation) {
 570         default:
 571                 info->fbcon_rotate_hint = FB_ROTATE_UR;
 572                 break;
 573         case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
 574                 info->fbcon_rotate_hint = FB_ROTATE_UD;
 575                 break;
 576         case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
 577                 info->fbcon_rotate_hint = FB_ROTATE_CCW;
 578                 break;
 579         case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
 580                 info->fbcon_rotate_hint = FB_ROTATE_CW;
 581                 break;
 582         }
 583
 584         err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
 585         if (err) {
 586                 pr_err("efifb: cannot add sysfs attrs\n");
 587                 goto err_unmap;
 588         }
 589         err = fb_alloc_cmap(&info->cmap, 256, 0);
 590         if (err < 0) {
 591                 pr_err("efifb: cannot allocate colormap\n");
 592                 goto err_groups;
 593         }
 594
 595         if (efifb_pci_dev)
 596                 WARN_ON(pm_runtime_get_sync(&efifb_pci_dev->dev) < 0);
 597
 598         err = register_framebuffer(info);
 599         if (err < 0) {
 600                 pr_err("efifb: cannot register framebuffer\n");
 601                 goto err_put_rpm_ref;
 602         }
 603         fb_info(info, "%s frame buffer device\n", info->fix.id);
 604         return 0;
 605
 606 err_put_rpm_ref:
 607         if (efifb_pci_dev)
 608                 pm_runtime_put(&efifb_pci_dev->dev);
 609
 610         fb_dealloc_cmap(&info->cmap);
 611 err_groups:
 612         sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
 613 err_unmap:
 614         if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
 615                 iounmap(info->screen_base);
 616         else
 617                 memunmap(info->screen_base);
 618 err_release_fb:
 619         framebuffer_release(info);
 620 err_release_mem:
 621         if (request_mem_succeeded)
 622                 release_mem_region(efifb_fix.smem_start, size_total);
 623         return err;
 624 }
 625
 626 static int efifb_remove(struct platform_device *pdev)
 627 {
 628         struct fb_info *info = platform_get_drvdata(pdev);
 629
 630         /* efifb_destroy takes care of info cleanup */
 631         unregister_framebuffer(info);
 632         sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
 633
 634         return 0;
 635 }
 636
 637 static struct platform_driver efifb_driver = {
 638         .driver = {
 639                 .name = "efi-framebuffer",
 640         },
 641         .probe = efifb_probe,
 642         .remove = efifb_remove,
 643 };
 644
 645 builtin_platform_driver(efifb_driver);
 646
 647 #if defined(CONFIG_PCI)
 648
 649 static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
 650 {
 651         u16 word;
 652
 653         efifb_pci_dev = dev;
 654
 655         pci_read_config_word(dev, PCI_COMMAND, &word);
 656         if (!(word & PCI_COMMAND_MEMORY)) {
 657                 pci_dev_disabled = true;
 658                 dev_err(&dev->dev,
 659                         "BAR %d: assigned to efifb but device is disabled!\n",
 660                         idx);
 661                 return;
 662         }
 663
 664         bar_resource = &dev->resource[idx];
 665         bar_offset = offset;
 666
 667         dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
 668 }
 669
 670 static void efifb_fixup_resources(struct pci_dev *dev)
 671 {
 672         u64 base = screen_info.lfb_base;
 673         u64 size = screen_info.lfb_size;
 674         int i;
 675
 676         if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
 677                 return;
 678
 679         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
 680                 base |= (u64)screen_info.ext_lfb_base << 32;
 681
 682         if (!base)
 683                 return;
 684
 685         for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 686                 struct resource *res = &dev->resource[i];
 687
 688                 if (!(res->flags & IORESOURCE_MEM))
 689                         continue;
 690
 691                 if (res->start <= base && res->end >= base + size - 1) {
 692                         record_efifb_bar_resource(dev, i, base - res->start);
 693                         break;
 694                 }
 695         }
 696 }
 697 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
 698                                16, efifb_fixup_resources);
 699
 700 #endif