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