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         if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
 362                 return -ENODEV;
 363
 364         if (fb_get_options("efifb", &option))
 365                 return -ENODEV;
 366         efifb_setup(option);
 367
 368         /* We don't get linelength from UGA Draw Protocol, only from
 369          * EFI Graphics Protocol.  So if it's not in DMI, and it's not
 370          * passed in from the user, we really can't use the framebuffer.
 371          */
 372         if (!screen_info.lfb_linelength)
 373                 return -ENODEV;
 374
 375         if (!screen_info.lfb_depth)
 376                 screen_info.lfb_depth = 32;
 377         if (!screen_info.pages)
 378                 screen_info.pages = 1;
 379         if (!fb_base_is_valid()) {
 380                 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
 381                 return -ENODEV;
 382         }
 383         printk(KERN_INFO "efifb: probing for efifb\n");
 384
 385         /* just assume they're all unset if any are */
 386         if (!screen_info.blue_size) {
 387                 screen_info.blue_size = 8;
 388                 screen_info.blue_pos = 0;
 389                 screen_info.green_size = 8;
 390                 screen_info.green_pos = 8;
 391                 screen_info.red_size = 8;
 392                 screen_info.red_pos = 16;
 393                 screen_info.rsvd_size = 8;
 394                 screen_info.rsvd_pos = 24;
 395         }
 396
 397         efifb_fix.smem_start = screen_info.lfb_base;
 398
 399         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
 400                 u64 ext_lfb_base;
 401
 402                 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
 403                 efifb_fix.smem_start |= ext_lfb_base;
 404         }
 405
 406         if (bar_resource &&
 407             bar_resource->start + bar_offset != efifb_fix.smem_start) {
 408                 dev_info(&efifb_pci_dev->dev,
 409                          "BAR has moved, updating efifb address\n");
 410                 efifb_fix.smem_start = bar_resource->start + bar_offset;
 411         }
 412
 413         efifb_defined.bits_per_pixel = screen_info.lfb_depth;
 414         efifb_defined.xres = screen_info.lfb_width;
 415         efifb_defined.yres = screen_info.lfb_height;
 416         efifb_fix.line_length = screen_info.lfb_linelength;
 417
 418         /*   size_vmode -- that is the amount of memory needed for the
 419          *                 used video mode, i.e. the minimum amount of
 420          *                 memory we need. */
 421         size_vmode = efifb_defined.yres * efifb_fix.line_length;
 422
 423         /*   size_total -- all video memory we have. Used for
 424          *                 entries, ressource allocation and bounds
 425          *                 checking. */
 426         size_total = screen_info.lfb_size;
 427         if (size_total < size_vmode)
 428                 size_total = size_vmode;
 429
 430         /*   size_remap -- the amount of video memory we are going to
 431          *                 use for efifb.  With modern cards it is no
 432          *                 option to simply use size_total as that
 433          *                 wastes plenty of kernel address space. */
 434         size_remap  = size_vmode * 2;
 435         if (size_remap > size_total)
 436                 size_remap = size_total;
 437         if (size_remap % PAGE_SIZE)
 438                 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
 439         efifb_fix.smem_len = size_remap;
 440
 441         if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
 442                 request_mem_succeeded = true;
 443         } else {
 444                 /* We cannot make this fatal. Sometimes this comes from magic
 445                    spaces our resource handlers simply don't know about */
 446                 pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
 447                         efifb_fix.smem_start);
 448         }
 449
 450         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 451         if (!info) {
 452                 err = -ENOMEM;
 453                 goto err_release_mem;
 454         }
 455         platform_set_drvdata(dev, info);
 456         info->pseudo_palette = info->par;
 457         info->par = NULL;
 458
 459         info->apertures = alloc_apertures(1);
 460         if (!info->apertures) {
 461                 err = -ENOMEM;
 462                 goto err_release_fb;
 463         }
 464         info->apertures->ranges[0].base = efifb_fix.smem_start;
 465         info->apertures->ranges[0].size = size_remap;
 466
 467         if (efi_enabled(EFI_MEMMAP) &&
 468             !efi_mem_desc_lookup(efifb_fix.smem_start, &md)) {
 469                 if ((efifb_fix.smem_start + efifb_fix.smem_len) >
 470                     (md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT))) {
 471                         pr_err("efifb: video memory @ 0x%lx spans multiple EFI memory regions\n",
 472                                efifb_fix.smem_start);
 473                         err = -EIO;
 474                         goto err_release_fb;
 475                 }
 476                 /*
 477                  * If the UEFI memory map covers the efifb region, we may only
 478                  * remap it using the attributes the memory map prescribes.
 479                  */
 480                 md.attribute &= EFI_MEMORY_UC | EFI_MEMORY_WC |
 481                                 EFI_MEMORY_WT | EFI_MEMORY_WB;
 482                 if (md.attribute) {
 483                         mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB;
 484                         mem_flags &= md.attribute;
 485                 }
 486         }
 487         if (mem_flags & EFI_MEMORY_WC)
 488                 info->screen_base = ioremap_wc(efifb_fix.smem_start,
 489                                                efifb_fix.smem_len);
 490         else if (mem_flags & EFI_MEMORY_UC)
 491                 info->screen_base = ioremap(efifb_fix.smem_start,
 492                                             efifb_fix.smem_len);
 493         else if (mem_flags & EFI_MEMORY_WT)
 494                 info->screen_base = memremap(efifb_fix.smem_start,
 495                                              efifb_fix.smem_len, MEMREMAP_WT);
 496         else if (mem_flags & EFI_MEMORY_WB)
 497                 info->screen_base = memremap(efifb_fix.smem_start,
 498                                              efifb_fix.smem_len, MEMREMAP_WB);
 499         if (!info->screen_base) {
 500                 pr_err("efifb: abort, cannot remap video memory 0x%x @ 0x%lx\n",
 501                         efifb_fix.smem_len, efifb_fix.smem_start);
 502                 err = -EIO;
 503                 goto err_release_fb;
 504         }
 505
 506         efifb_show_boot_graphics(info);
 507
 508         pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
 509                efifb_fix.smem_start, size_remap/1024, size_total/1024);
 510         pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 511                efifb_defined.xres, efifb_defined.yres,
 512                efifb_defined.bits_per_pixel, efifb_fix.line_length,
 513                screen_info.pages);
 514
 515         efifb_defined.xres_virtual = efifb_defined.xres;
 516         efifb_defined.yres_virtual = efifb_fix.smem_len /
 517                                         efifb_fix.line_length;
 518         pr_info("efifb: scrolling: redraw\n");
 519         efifb_defined.yres_virtual = efifb_defined.yres;
 520
 521         /* some dummy values for timing to make fbset happy */
 522         efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
 523                                         1000 / efifb_defined.yres;
 524         efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
 525         efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;
 526
 527         efifb_defined.red.offset    = screen_info.red_pos;
 528         efifb_defined.red.length    = screen_info.red_size;
 529         efifb_defined.green.offset  = screen_info.green_pos;
 530         efifb_defined.green.length  = screen_info.green_size;
 531         efifb_defined.blue.offset   = screen_info.blue_pos;
 532         efifb_defined.blue.length   = screen_info.blue_size;
 533         efifb_defined.transp.offset = screen_info.rsvd_pos;
 534         efifb_defined.transp.length = screen_info.rsvd_size;
 535
 536         pr_info("efifb: %s: "
 537                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 538                "Truecolor",
 539                screen_info.rsvd_size,
 540                screen_info.red_size,
 541                screen_info.green_size,
 542                screen_info.blue_size,
 543                screen_info.rsvd_pos,
 544                screen_info.red_pos,
 545                screen_info.green_pos,
 546                screen_info.blue_pos);
 547
 548         efifb_fix.ypanstep  = 0;
 549         efifb_fix.ywrapstep = 0;
 550
 551         info->fbops = &efifb_ops;
 552         info->var = efifb_defined;
 553         info->fix = efifb_fix;
 554         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
 555
 556         orientation = drm_get_panel_orientation_quirk(efifb_defined.xres,
 557                                                       efifb_defined.yres);
 558         switch (orientation) {
 559         default:
 560                 info->fbcon_rotate_hint = FB_ROTATE_UR;
 561                 break;
 562         case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
 563                 info->fbcon_rotate_hint = FB_ROTATE_UD;
 564                 break;
 565         case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
 566                 info->fbcon_rotate_hint = FB_ROTATE_CCW;
 567                 break;
 568         case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
 569                 info->fbcon_rotate_hint = FB_ROTATE_CW;
 570                 break;
 571         }
 572
 573         err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
 574         if (err) {
 575                 pr_err("efifb: cannot add sysfs attrs\n");
 576                 goto err_unmap;
 577         }
 578         err = fb_alloc_cmap(&info->cmap, 256, 0);
 579         if (err < 0) {
 580                 pr_err("efifb: cannot allocate colormap\n");
 581                 goto err_groups;
 582         }
 583
 584         if (efifb_pci_dev)
 585                 WARN_ON(pm_runtime_get_sync(&efifb_pci_dev->dev) < 0);
 586
 587         err = register_framebuffer(info);
 588         if (err < 0) {
 589                 pr_err("efifb: cannot register framebuffer\n");
 590                 goto err_put_rpm_ref;
 591         }
 592         fb_info(info, "%s frame buffer device\n", info->fix.id);
 593         return 0;
 594
 595 err_put_rpm_ref:
 596         if (efifb_pci_dev)
 597                 pm_runtime_put(&efifb_pci_dev->dev);
 598
 599         fb_dealloc_cmap(&info->cmap);
 600 err_groups:
 601         sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
 602 err_unmap:
 603         if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
 604                 iounmap(info->screen_base);
 605         else
 606                 memunmap(info->screen_base);
 607 err_release_fb:
 608         framebuffer_release(info);
 609 err_release_mem:
 610         if (request_mem_succeeded)
 611                 release_mem_region(efifb_fix.smem_start, size_total);
 612         return err;
 613 }
 614
 615 static int efifb_remove(struct platform_device *pdev)
 616 {
 617         struct fb_info *info = platform_get_drvdata(pdev);
 618
 619         /* efifb_destroy takes care of info cleanup */
 620         unregister_framebuffer(info);
 621         sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
 622
 623         return 0;
 624 }
 625
 626 static struct platform_driver efifb_driver = {
 627         .driver = {
 628                 .name = "efi-framebuffer",
 629         },
 630         .probe = efifb_probe,
 631         .remove = efifb_remove,
 632 };
 633
 634 builtin_platform_driver(efifb_driver);
 635
 636 #if defined(CONFIG_PCI)
 637
 638 static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
 639 {
 640         u16 word;
 641
 642         efifb_pci_dev = dev;
 643
 644         pci_read_config_word(dev, PCI_COMMAND, &word);
 645         if (!(word & PCI_COMMAND_MEMORY)) {
 646                 pci_dev_disabled = true;
 647                 dev_err(&dev->dev,
 648                         "BAR %d: assigned to efifb but device is disabled!\n",
 649                         idx);
 650                 return;
 651         }
 652
 653         bar_resource = &dev->resource[idx];
 654         bar_offset = offset;
 655
 656         dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
 657 }
 658
 659 static void efifb_fixup_resources(struct pci_dev *dev)
 660 {
 661         u64 base = screen_info.lfb_base;
 662         u64 size = screen_info.lfb_size;
 663         int i;
 664
 665         if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
 666                 return;
 667
 668         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
 669                 base |= (u64)screen_info.ext_lfb_base << 32;
 670
 671         if (!base)
 672                 return;
 673
 674         for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 675                 struct resource *res = &dev->resource[i];
 676
 677                 if (!(res->flags & IORESOURCE_MEM))
 678                         continue;
 679
 680                 if (res->start <= base && res->end >= base + size - 1) {
 681                         record_efifb_bar_resource(dev, i, base - res->start);
 682                         break;
 683                 }
 684         }
 685 }
 686 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
 687                                16, efifb_fixup_resources);
 688
 689 #endif