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
efifb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)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
efifb_copy_bmp(u8 * src,u32 * dst,int width,struct screen_info * si)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 */
efifb_bgrt_sanity_check(struct screen_info * si,u32 bmp_width)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
efifb_bgrt_sanity_check(struct screen_info * si,u32 bmp_width)137 static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
138 {
139 return true;
140 }
141 #endif
142
efifb_show_boot_graphics(struct fb_info * info)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
efifb_show_boot_graphics(struct fb_info * info)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 */
efifb_destroy(struct fb_info * info)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
efifb_setup(char * options)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
fb_base_is_valid(void)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
efifb_probe(struct platform_device * dev)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
efifb_remove(struct platform_device * pdev)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
record_efifb_bar_resource(struct pci_dev * dev,int idx,u64 offset)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
efifb_fixup_resources(struct pci_dev * dev)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
690
