Merge tag 'fbdev-v4.19' of https://github.com/bzolnier/linux
[muen/linux.git] / 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 request_mem_succeeded = false;
46 static u64 mem_flags = EFI_MEMORY_WC | EFI_MEMORY_UC;
47
48 static struct fb_var_screeninfo efifb_defined = {
49         .activate               = FB_ACTIVATE_NOW,
50         .height                 = -1,
51         .width                  = -1,
52         .right_margin           = 32,
53         .upper_margin           = 16,
54         .lower_margin           = 4,
55         .vsync_len              = 4,
56         .vmode                  = FB_VMODE_NONINTERLACED,
57 };
58
59 static struct fb_fix_screeninfo efifb_fix = {
60         .id                     = "EFI VGA",
61         .type                   = FB_TYPE_PACKED_PIXELS,
62         .accel                  = FB_ACCEL_NONE,
63         .visual                 = FB_VISUAL_TRUECOLOR,
64 };
65
66 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
67                            unsigned blue, unsigned transp,
68                            struct fb_info *info)
69 {
70         /*
71          *  Set a single color register. The values supplied are
72          *  already rounded down to the hardware's capabilities
73          *  (according to the entries in the `var' structure). Return
74          *  != 0 for invalid regno.
75          */
76
77         if (regno >= info->cmap.len)
78                 return 1;
79
80         if (regno < 16) {
81                 red   >>= 16 - info->var.red.length;
82                 green >>= 16 - info->var.green.length;
83                 blue  >>= 16 - info->var.blue.length;
84                 ((u32 *)(info->pseudo_palette))[regno] =
85                         (red   << info->var.red.offset)   |
86                         (green << info->var.green.offset) |
87                         (blue  << info->var.blue.offset);
88         }
89         return 0;
90 }
91
92 /*
93  * If fbcon deffered console takeover is configured, the intent is for the
94  * framebuffer to show the boot graphics (e.g. vendor logo) until there is some
95  * (error) message to display. But the boot graphics may have been destroyed by
96  * e.g. option ROM output, detect this and restore the boot graphics.
97  */
98 #if defined CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER && \
99     defined CONFIG_ACPI_BGRT
100 static void efifb_copy_bmp(u8 *src, u32 *dst, int width, struct screen_info *si)
101 {
102         u8 r, g, b;
103
104         while (width--) {
105                 b = *src++;
106                 g = *src++;
107                 r = *src++;
108                 *dst++ = (r << si->red_pos)   |
109                          (g << si->green_pos) |
110                          (b << si->blue_pos);
111         }
112 }
113
114 #ifdef CONFIG_X86
115 /*
116  * On x86 some firmwares use a low non native resolution for the display when
117  * they have shown some text messages. While keeping the bgrt filled with info
118  * for the native resolution. If the bgrt image intended for the native
119  * resolution still fits, it will be displayed very close to the right edge of
120  * the display looking quite bad. This function checks for this.
121  */
122 static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
123 {
124         static const int default_resolutions[][2] = {
125                 {  800,  600 },
126                 { 1024,  768 },
127                 { 1280, 1024 },
128         };
129         u32 i, right_margin;
130
131         for (i = 0; i < ARRAY_SIZE(default_resolutions); i++) {
132                 if (default_resolutions[i][0] == si->lfb_width &&
133                     default_resolutions[i][1] == si->lfb_height)
134                         break;
135         }
136         /* If not a default resolution used for textmode, this should be fine */
137         if (i >= ARRAY_SIZE(default_resolutions))
138                 return true;
139
140         /* If the right margin is 5 times smaller then the left one, reject */
141         right_margin = si->lfb_width - (bgrt_tab.image_offset_x + bmp_width);
142         if (right_margin < (bgrt_tab.image_offset_x / 5))
143                 return false;
144
145         return true;
146 }
147 #else
148 static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
149 {
150         return true;
151 }
152 #endif
153
154 static void efifb_show_boot_graphics(struct fb_info *info)
155 {
156         u32 bmp_width, bmp_height, bmp_pitch, screen_pitch, dst_x, y, src_y;
157         struct screen_info *si = &screen_info;
158         struct bmp_file_header *file_header;
159         struct bmp_dib_header *dib_header;
160         void *bgrt_image = NULL;
161         u8 *dst = info->screen_base;
162
163         if (!bgrt_tab.image_address) {
164                 pr_info("efifb: No BGRT, not showing boot graphics\n");
165                 return;
166         }
167
168         /* Avoid flashing the logo if we're going to print std probe messages */
169         if (console_loglevel > CONSOLE_LOGLEVEL_QUIET)
170                 return;
171
172         /* bgrt_tab.status is unreliable, so we don't check it */
173
174         if (si->lfb_depth != 32) {
175                 pr_info("efifb: not 32 bits, not showing boot graphics\n");
176                 return;
177         }
178
179         bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
180                               MEMREMAP_WB);
181         if (!bgrt_image) {
182                 pr_warn("efifb: Ignoring BGRT: failed to map image memory\n");
183                 return;
184         }
185
186         if (bgrt_image_size < (sizeof(*file_header) + sizeof(*dib_header)))
187                 goto error;
188
189         file_header = bgrt_image;
190         if (file_header->id != 0x4d42 || file_header->reserved != 0)
191                 goto error;
192
193         dib_header = bgrt_image + sizeof(*file_header);
194         if (dib_header->dib_header_size != 40 || dib_header->width < 0 ||
195             dib_header->planes != 1 || dib_header->bpp != 24 ||
196             dib_header->compression != 0)
197                 goto error;
198
199         bmp_width = dib_header->width;
200         bmp_height = abs(dib_header->height);
201         bmp_pitch = round_up(3 * bmp_width, 4);
202         screen_pitch = si->lfb_linelength;
203
204         if ((file_header->bitmap_offset + bmp_pitch * bmp_height) >
205                                 bgrt_image_size)
206                 goto error;
207
208         if ((bgrt_tab.image_offset_x + bmp_width) > si->lfb_width ||
209             (bgrt_tab.image_offset_y + bmp_height) > si->lfb_height)
210                 goto error;
211
212         if (!efifb_bgrt_sanity_check(si, bmp_width))
213                 goto error;
214
215         pr_info("efifb: showing boot graphics\n");
216
217         for (y = 0; y < si->lfb_height; y++, dst += si->lfb_linelength) {
218                 /* Only background? */
219                 if (y < bgrt_tab.image_offset_y ||
220                     y >= (bgrt_tab.image_offset_y + bmp_height)) {
221                         memset(dst, 0, 4 * si->lfb_width);
222                         continue;
223                 }
224
225                 src_y = y - bgrt_tab.image_offset_y;
226                 /* Positive header height means upside down row order */
227                 if (dib_header->height > 0)
228                         src_y = (bmp_height - 1) - src_y;
229
230                 memset(dst, 0, bgrt_tab.image_offset_x * 4);
231                 dst_x = bgrt_tab.image_offset_x;
232                 efifb_copy_bmp(bgrt_image + file_header->bitmap_offset +
233                                             src_y * bmp_pitch,
234                                (u32 *)dst + dst_x, bmp_width, si);
235                 dst_x += bmp_width;
236                 memset((u32 *)dst + dst_x, 0, (si->lfb_width - dst_x) * 4);
237         }
238
239         memunmap(bgrt_image);
240         return;
241
242 error:
243         memunmap(bgrt_image);
244         pr_warn("efifb: Ignoring BGRT: unexpected or invalid BMP data\n");
245 }
246 #else
247 static inline void efifb_show_boot_graphics(struct fb_info *info) {}
248 #endif
249
250 static void efifb_destroy(struct fb_info *info)
251 {
252         if (info->screen_base) {
253                 if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
254                         iounmap(info->screen_base);
255                 else
256                         memunmap(info->screen_base);
257         }
258         if (request_mem_succeeded)
259                 release_mem_region(info->apertures->ranges[0].base,
260                                    info->apertures->ranges[0].size);
261         fb_dealloc_cmap(&info->cmap);
262 }
263
264 static struct fb_ops efifb_ops = {
265         .owner          = THIS_MODULE,
266         .fb_destroy     = efifb_destroy,
267         .fb_setcolreg   = efifb_setcolreg,
268         .fb_fillrect    = cfb_fillrect,
269         .fb_copyarea    = cfb_copyarea,
270         .fb_imageblit   = cfb_imageblit,
271 };
272
273 static int efifb_setup(char *options)
274 {
275         char *this_opt;
276
277         if (options && *options) {
278                 while ((this_opt = strsep(&options, ",")) != NULL) {
279                         if (!*this_opt) continue;
280
281                         efifb_setup_from_dmi(&screen_info, this_opt);
282
283                         if (!strncmp(this_opt, "base:", 5))
284                                 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
285                         else if (!strncmp(this_opt, "stride:", 7))
286                                 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
287                         else if (!strncmp(this_opt, "height:", 7))
288                                 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
289                         else if (!strncmp(this_opt, "width:", 6))
290                                 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
291                         else if (!strcmp(this_opt, "nowc"))
292                                 mem_flags &= ~EFI_MEMORY_WC;
293                 }
294         }
295
296         return 0;
297 }
298
299 static inline bool fb_base_is_valid(void)
300 {
301         if (screen_info.lfb_base)
302                 return true;
303
304         if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
305                 return false;
306
307         if (screen_info.ext_lfb_base)
308                 return true;
309
310         return false;
311 }
312
313 #define efifb_attr_decl(name, fmt)                                      \
314 static ssize_t name##_show(struct device *dev,                          \
315                            struct device_attribute *attr,               \
316                            char *buf)                                   \
317 {                                                                       \
318         return sprintf(buf, fmt "\n", (screen_info.lfb_##name));        \
319 }                                                                       \
320 static DEVICE_ATTR_RO(name)
321
322 efifb_attr_decl(base, "0x%x");
323 efifb_attr_decl(linelength, "%u");
324 efifb_attr_decl(height, "%u");
325 efifb_attr_decl(width, "%u");
326 efifb_attr_decl(depth, "%u");
327
328 static struct attribute *efifb_attrs[] = {
329         &dev_attr_base.attr,
330         &dev_attr_linelength.attr,
331         &dev_attr_width.attr,
332         &dev_attr_height.attr,
333         &dev_attr_depth.attr,
334         NULL
335 };
336 ATTRIBUTE_GROUPS(efifb);
337
338 static bool pci_dev_disabled;   /* FB base matches BAR of a disabled device */
339
340 static struct pci_dev *efifb_pci_dev;   /* dev with BAR covering the efifb */
341 static struct resource *bar_resource;
342 static u64 bar_offset;
343
344 static int efifb_probe(struct platform_device *dev)
345 {
346         struct fb_info *info;
347         int err, orientation;
348         unsigned int size_vmode;
349         unsigned int size_remap;
350         unsigned int size_total;
351         char *option = NULL;
352         efi_memory_desc_t md;
353
354         if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
355                 return -ENODEV;
356
357         if (fb_get_options("efifb", &option))
358                 return -ENODEV;
359         efifb_setup(option);
360
361         /* We don't get linelength from UGA Draw Protocol, only from
362          * EFI Graphics Protocol.  So if it's not in DMI, and it's not
363          * passed in from the user, we really can't use the framebuffer.
364          */
365         if (!screen_info.lfb_linelength)
366                 return -ENODEV;
367
368         if (!screen_info.lfb_depth)
369                 screen_info.lfb_depth = 32;
370         if (!screen_info.pages)
371                 screen_info.pages = 1;
372         if (!fb_base_is_valid()) {
373                 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
374                 return -ENODEV;
375         }
376         printk(KERN_INFO "efifb: probing for efifb\n");
377
378         /* just assume they're all unset if any are */
379         if (!screen_info.blue_size) {
380                 screen_info.blue_size = 8;
381                 screen_info.blue_pos = 0;
382                 screen_info.green_size = 8;
383                 screen_info.green_pos = 8;
384                 screen_info.red_size = 8;
385                 screen_info.red_pos = 16;
386                 screen_info.rsvd_size = 8;
387                 screen_info.rsvd_pos = 24;
388         }
389
390         efifb_fix.smem_start = screen_info.lfb_base;
391
392         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
393                 u64 ext_lfb_base;
394
395                 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
396                 efifb_fix.smem_start |= ext_lfb_base;
397         }
398
399         if (bar_resource &&
400             bar_resource->start + bar_offset != efifb_fix.smem_start) {
401                 dev_info(&efifb_pci_dev->dev,
402                          "BAR has moved, updating efifb address\n");
403                 efifb_fix.smem_start = bar_resource->start + bar_offset;
404         }
405
406         efifb_defined.bits_per_pixel = screen_info.lfb_depth;
407         efifb_defined.xres = screen_info.lfb_width;
408         efifb_defined.yres = screen_info.lfb_height;
409         efifb_fix.line_length = screen_info.lfb_linelength;
410
411         /*   size_vmode -- that is the amount of memory needed for the
412          *                 used video mode, i.e. the minimum amount of
413          *                 memory we need. */
414         size_vmode = efifb_defined.yres * efifb_fix.line_length;
415
416         /*   size_total -- all video memory we have. Used for
417          *                 entries, ressource allocation and bounds
418          *                 checking. */
419         size_total = screen_info.lfb_size;
420         if (size_total < size_vmode)
421                 size_total = size_vmode;
422
423         /*   size_remap -- the amount of video memory we are going to
424          *                 use for efifb.  With modern cards it is no
425          *                 option to simply use size_total as that
426          *                 wastes plenty of kernel address space. */
427         size_remap  = size_vmode * 2;
428         if (size_remap > size_total)
429                 size_remap = size_total;
430         if (size_remap % PAGE_SIZE)
431                 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
432         efifb_fix.smem_len = size_remap;
433
434         if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
435                 request_mem_succeeded = true;
436         } else {
437                 /* We cannot make this fatal. Sometimes this comes from magic
438                    spaces our resource handlers simply don't know about */
439                 pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
440                         efifb_fix.smem_start);
441         }
442
443         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
444         if (!info) {
445                 pr_err("efifb: cannot allocate framebuffer\n");
446                 err = -ENOMEM;
447                 goto err_release_mem;
448         }
449         platform_set_drvdata(dev, info);
450         info->pseudo_palette = info->par;
451         info->par = NULL;
452
453         info->apertures = alloc_apertures(1);
454         if (!info->apertures) {
455                 err = -ENOMEM;
456                 goto err_release_fb;
457         }
458         info->apertures->ranges[0].base = efifb_fix.smem_start;
459         info->apertures->ranges[0].size = size_remap;
460
461         if (!efi_mem_desc_lookup(efifb_fix.smem_start, &md)) {
462                 if ((efifb_fix.smem_start + efifb_fix.smem_len) >
463                     (md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT))) {
464                         pr_err("efifb: video memory @ 0x%lx spans multiple EFI memory regions\n",
465                                efifb_fix.smem_start);
466                         err = -EIO;
467                         goto err_release_fb;
468                 }
469                 /*
470                  * If the UEFI memory map covers the efifb region, we may only
471                  * remap it using the attributes the memory map prescribes.
472                  */
473                 mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB;
474                 mem_flags &= md.attribute;
475         }
476         if (mem_flags & EFI_MEMORY_WC)
477                 info->screen_base = ioremap_wc(efifb_fix.smem_start,
478                                                efifb_fix.smem_len);
479         else if (mem_flags & EFI_MEMORY_UC)
480                 info->screen_base = ioremap(efifb_fix.smem_start,
481                                             efifb_fix.smem_len);
482         else if (mem_flags & EFI_MEMORY_WT)
483                 info->screen_base = memremap(efifb_fix.smem_start,
484                                              efifb_fix.smem_len, MEMREMAP_WT);
485         else if (mem_flags & EFI_MEMORY_WB)
486                 info->screen_base = memremap(efifb_fix.smem_start,
487                                              efifb_fix.smem_len, MEMREMAP_WB);
488         if (!info->screen_base) {
489                 pr_err("efifb: abort, cannot remap video memory 0x%x @ 0x%lx\n",
490                         efifb_fix.smem_len, efifb_fix.smem_start);
491                 err = -EIO;
492                 goto err_release_fb;
493         }
494
495         efifb_show_boot_graphics(info);
496
497         pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
498                efifb_fix.smem_start, size_remap/1024, size_total/1024);
499         pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
500                efifb_defined.xres, efifb_defined.yres,
501                efifb_defined.bits_per_pixel, efifb_fix.line_length,
502                screen_info.pages);
503
504         efifb_defined.xres_virtual = efifb_defined.xres;
505         efifb_defined.yres_virtual = efifb_fix.smem_len /
506                                         efifb_fix.line_length;
507         pr_info("efifb: scrolling: redraw\n");
508         efifb_defined.yres_virtual = efifb_defined.yres;
509
510         /* some dummy values for timing to make fbset happy */
511         efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
512                                         1000 / efifb_defined.yres;
513         efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
514         efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;
515
516         efifb_defined.red.offset    = screen_info.red_pos;
517         efifb_defined.red.length    = screen_info.red_size;
518         efifb_defined.green.offset  = screen_info.green_pos;
519         efifb_defined.green.length  = screen_info.green_size;
520         efifb_defined.blue.offset   = screen_info.blue_pos;
521         efifb_defined.blue.length   = screen_info.blue_size;
522         efifb_defined.transp.offset = screen_info.rsvd_pos;
523         efifb_defined.transp.length = screen_info.rsvd_size;
524
525         pr_info("efifb: %s: "
526                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
527                "Truecolor",
528                screen_info.rsvd_size,
529                screen_info.red_size,
530                screen_info.green_size,
531                screen_info.blue_size,
532                screen_info.rsvd_pos,
533                screen_info.red_pos,
534                screen_info.green_pos,
535                screen_info.blue_pos);
536
537         efifb_fix.ypanstep  = 0;
538         efifb_fix.ywrapstep = 0;
539
540         info->fbops = &efifb_ops;
541         info->var = efifb_defined;
542         info->fix = efifb_fix;
543         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
544
545         orientation = drm_get_panel_orientation_quirk(efifb_defined.xres,
546                                                       efifb_defined.yres);
547         switch (orientation) {
548         default:
549                 info->fbcon_rotate_hint = FB_ROTATE_UR;
550                 break;
551         case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
552                 info->fbcon_rotate_hint = FB_ROTATE_UD;
553                 break;
554         case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
555                 info->fbcon_rotate_hint = FB_ROTATE_CCW;
556                 break;
557         case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
558                 info->fbcon_rotate_hint = FB_ROTATE_CW;
559                 break;
560         }
561
562         err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
563         if (err) {
564                 pr_err("efifb: cannot add sysfs attrs\n");
565                 goto err_unmap;
566         }
567         err = fb_alloc_cmap(&info->cmap, 256, 0);
568         if (err < 0) {
569                 pr_err("efifb: cannot allocate colormap\n");
570                 goto err_groups;
571         }
572         err = register_framebuffer(info);
573         if (err < 0) {
574                 pr_err("efifb: cannot register framebuffer\n");
575                 goto err_fb_dealoc;
576         }
577         fb_info(info, "%s frame buffer device\n", info->fix.id);
578         return 0;
579
580 err_fb_dealoc:
581         fb_dealloc_cmap(&info->cmap);
582 err_groups:
583         sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
584 err_unmap:
585         if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
586                 iounmap(info->screen_base);
587         else
588                 memunmap(info->screen_base);
589 err_release_fb:
590         framebuffer_release(info);
591 err_release_mem:
592         if (request_mem_succeeded)
593                 release_mem_region(efifb_fix.smem_start, size_total);
594         return err;
595 }
596
597 static int efifb_remove(struct platform_device *pdev)
598 {
599         struct fb_info *info = platform_get_drvdata(pdev);
600
601         unregister_framebuffer(info);
602         sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
603         framebuffer_release(info);
604
605         return 0;
606 }
607
608 static struct platform_driver efifb_driver = {
609         .driver = {
610                 .name = "efi-framebuffer",
611         },
612         .probe = efifb_probe,
613         .remove = efifb_remove,
614 };
615
616 builtin_platform_driver(efifb_driver);
617
618 #if defined(CONFIG_PCI)
619
620 static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
621 {
622         u16 word;
623
624         efifb_pci_dev = dev;
625
626         pci_read_config_word(dev, PCI_COMMAND, &word);
627         if (!(word & PCI_COMMAND_MEMORY)) {
628                 pci_dev_disabled = true;
629                 dev_err(&dev->dev,
630                         "BAR %d: assigned to efifb but device is disabled!\n",
631                         idx);
632                 return;
633         }
634
635         bar_resource = &dev->resource[idx];
636         bar_offset = offset;
637
638         dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
639 }
640
641 static void efifb_fixup_resources(struct pci_dev *dev)
642 {
643         u64 base = screen_info.lfb_base;
644         u64 size = screen_info.lfb_size;
645         int i;
646
647         if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
648                 return;
649
650         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
651                 base |= (u64)screen_info.ext_lfb_base << 32;
652
653         if (!base)
654                 return;
655
656         for (i = 0; i <= PCI_STD_RESOURCE_END; i++) {
657                 struct resource *res = &dev->resource[i];
658
659                 if (!(res->flags & IORESOURCE_MEM))
660                         continue;
661
662                 if (res->start <= base && res->end >= base + size - 1) {
663                         record_efifb_bar_resource(dev, i, base - res->start);
664                         break;
665                 }
666         }
667 }
668 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
669                                16, efifb_fixup_resources);
670
671 #endif