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 /*
362 * Generic drivers must not be registered if a framebuffer exists.
363 * If a native driver was probed, the display hardware was already
364 * taken and attempting to use the system framebuffer is dangerous.
365 */
366 if (num_registered_fb > 0) {
367 dev_err(&dev->dev,
368 "efifb: a framebuffer is already registered\n");
369 return -EINVAL;
370 }
371
372 if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
373 return -ENODEV;
374
375 if (fb_get_options("efifb", &option))
376 return -ENODEV;
377 efifb_setup(option);
378
379 /* We don't get linelength from UGA Draw Protocol, only from
380 * EFI Graphics Protocol. So if it's not in DMI, and it's not
381 * passed in from the user, we really can't use the framebuffer.
382 */
383 if (!screen_info.lfb_linelength)
384 return -ENODEV;
385
386 if (!screen_info.lfb_depth)
387 screen_info.lfb_depth = 32;
388 if (!screen_info.pages)
389 screen_info.pages = 1;
390 if (!fb_base_is_valid()) {
391 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
392 return -ENODEV;
393 }
394 printk(KERN_INFO "efifb: probing for efifb\n");
395
396 /* just assume they're all unset if any are */
397 if (!screen_info.blue_size) {
398 screen_info.blue_size = 8;
399 screen_info.blue_pos = 0;
400 screen_info.green_size = 8;
401 screen_info.green_pos = 8;
402 screen_info.red_size = 8;
403 screen_info.red_pos = 16;
404 screen_info.rsvd_size = 8;
405 screen_info.rsvd_pos = 24;
406 }
407
408 efifb_fix.smem_start = screen_info.lfb_base;
409
410 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
411 u64 ext_lfb_base;
412
413 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
414 efifb_fix.smem_start |= ext_lfb_base;
415 }
416
417 if (bar_resource &&
418 bar_resource->start + bar_offset != efifb_fix.smem_start) {
419 dev_info(&efifb_pci_dev->dev,
420 "BAR has moved, updating efifb address\n");
421 efifb_fix.smem_start = bar_resource->start + bar_offset;
422 }
423
424 efifb_defined.bits_per_pixel = screen_info.lfb_depth;
425 efifb_defined.xres = screen_info.lfb_width;
426 efifb_defined.yres = screen_info.lfb_height;
427 efifb_fix.line_length = screen_info.lfb_linelength;
428
429 /* size_vmode -- that is the amount of memory needed for the
430 * used video mode, i.e. the minimum amount of
431 * memory we need. */
432 size_vmode = efifb_defined.yres * efifb_fix.line_length;
433
434 /* size_total -- all video memory we have. Used for
435 * entries, ressource allocation and bounds
436 * checking. */
437 size_total = screen_info.lfb_size;
438 if (size_total < size_vmode)
439 size_total = size_vmode;
440
441 /* size_remap -- the amount of video memory we are going to
442 * use for efifb. With modern cards it is no
443 * option to simply use size_total as that
444 * wastes plenty of kernel address space. */
445 size_remap = size_vmode * 2;
446 if (size_remap > size_total)
447 size_remap = size_total;
448 if (size_remap % PAGE_SIZE)
449 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
450 efifb_fix.smem_len = size_remap;
451
452 if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
453 request_mem_succeeded = true;
454 } else {
455 /* We cannot make this fatal. Sometimes this comes from magic
456 spaces our resource handlers simply don't know about */
457 pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
458 efifb_fix.smem_start);
459 }
460
461 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
462 if (!info) {
463 err = -ENOMEM;
464 goto err_release_mem;
465 }
466 platform_set_drvdata(dev, info);
467 info->pseudo_palette = info->par;
468 info->par = NULL;
469
470 info->apertures = alloc_apertures(1);
471 if (!info->apertures) {
472 err = -ENOMEM;
473 goto err_release_fb;
474 }
475 info->apertures->ranges[0].base = efifb_fix.smem_start;
476 info->apertures->ranges[0].size = size_remap;
477
478 if (efi_enabled(EFI_MEMMAP) &&
479 !efi_mem_desc_lookup(efifb_fix.smem_start, &md)) {
480 if ((efifb_fix.smem_start + efifb_fix.smem_len) >
481 (md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT))) {
482 pr_err("efifb: video memory @ 0x%lx spans multiple EFI memory regions\n",
483 efifb_fix.smem_start);
484 err = -EIO;
485 goto err_release_fb;
486 }
487 /*
488 * If the UEFI memory map covers the efifb region, we may only
489 * remap it using the attributes the memory map prescribes.
490 */
491 md.attribute &= EFI_MEMORY_UC | EFI_MEMORY_WC |
492 EFI_MEMORY_WT | EFI_MEMORY_WB;
493 if (md.attribute) {
494 mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB;
495 mem_flags &= md.attribute;
496 }
497 }
498 if (mem_flags & EFI_MEMORY_WC)
499 info->screen_base = ioremap_wc(efifb_fix.smem_start,
500 efifb_fix.smem_len);
501 else if (mem_flags & EFI_MEMORY_UC)
502 info->screen_base = ioremap(efifb_fix.smem_start,
503 efifb_fix.smem_len);
504 else if (mem_flags & EFI_MEMORY_WT)
505 info->screen_base = memremap(efifb_fix.smem_start,
506 efifb_fix.smem_len, MEMREMAP_WT);
507 else if (mem_flags & EFI_MEMORY_WB)
508 info->screen_base = memremap(efifb_fix.smem_start,
509 efifb_fix.smem_len, MEMREMAP_WB);
510 if (!info->screen_base) {
511 pr_err("efifb: abort, cannot remap video memory 0x%x @ 0x%lx\n",
512 efifb_fix.smem_len, efifb_fix.smem_start);
513 err = -EIO;
514 goto err_release_fb;
515 }
516
517 efifb_show_boot_graphics(info);
518
519 pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
520 efifb_fix.smem_start, size_remap/1024, size_total/1024);
521 pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
522 efifb_defined.xres, efifb_defined.yres,
523 efifb_defined.bits_per_pixel, efifb_fix.line_length,
524 screen_info.pages);
525
526 efifb_defined.xres_virtual = efifb_defined.xres;
527 efifb_defined.yres_virtual = efifb_fix.smem_len /
528 efifb_fix.line_length;
529 pr_info("efifb: scrolling: redraw\n");
530 efifb_defined.yres_virtual = efifb_defined.yres;
531
532 /* some dummy values for timing to make fbset happy */
533 efifb_defined.pixclock = 10000000 / efifb_defined.xres *
534 1000 / efifb_defined.yres;
535 efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8;
536 efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8;
537
538 efifb_defined.red.offset = screen_info.red_pos;
539 efifb_defined.red.length = screen_info.red_size;
540 efifb_defined.green.offset = screen_info.green_pos;
541 efifb_defined.green.length = screen_info.green_size;
542 efifb_defined.blue.offset = screen_info.blue_pos;
543 efifb_defined.blue.length = screen_info.blue_size;
544 efifb_defined.transp.offset = screen_info.rsvd_pos;
545 efifb_defined.transp.length = screen_info.rsvd_size;
546
547 pr_info("efifb: %s: "
548 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
549 "Truecolor",
550 screen_info.rsvd_size,
551 screen_info.red_size,
552 screen_info.green_size,
553 screen_info.blue_size,
554 screen_info.rsvd_pos,
555 screen_info.red_pos,
556 screen_info.green_pos,
557 screen_info.blue_pos);
558
559 efifb_fix.ypanstep = 0;
560 efifb_fix.ywrapstep = 0;
561
562 info->fbops = &efifb_ops;
563 info->var = efifb_defined;
564 info->fix = efifb_fix;
565 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
566
567 orientation = drm_get_panel_orientation_quirk(efifb_defined.xres,
568 efifb_defined.yres);
569 switch (orientation) {
570 default:
571 info->fbcon_rotate_hint = FB_ROTATE_UR;
572 break;
573 case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
574 info->fbcon_rotate_hint = FB_ROTATE_UD;
575 break;
576 case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
577 info->fbcon_rotate_hint = FB_ROTATE_CCW;
578 break;
579 case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
580 info->fbcon_rotate_hint = FB_ROTATE_CW;
581 break;
582 }
583
584 err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
585 if (err) {
586 pr_err("efifb: cannot add sysfs attrs\n");
587 goto err_unmap;
588 }
589 err = fb_alloc_cmap(&info->cmap, 256, 0);
590 if (err < 0) {
591 pr_err("efifb: cannot allocate colormap\n");
592 goto err_groups;
593 }
594
595 if (efifb_pci_dev)
596 WARN_ON(pm_runtime_get_sync(&efifb_pci_dev->dev) < 0);
597
598 err = register_framebuffer(info);
599 if (err < 0) {
600 pr_err("efifb: cannot register framebuffer\n");
601 goto err_put_rpm_ref;
602 }
603 fb_info(info, "%s frame buffer device\n", info->fix.id);
604 return 0;
605
606 err_put_rpm_ref:
607 if (efifb_pci_dev)
608 pm_runtime_put(&efifb_pci_dev->dev);
609
610 fb_dealloc_cmap(&info->cmap);
611 err_groups:
612 sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
613 err_unmap:
614 if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
615 iounmap(info->screen_base);
616 else
617 memunmap(info->screen_base);
618 err_release_fb:
619 framebuffer_release(info);
620 err_release_mem:
621 if (request_mem_succeeded)
622 release_mem_region(efifb_fix.smem_start, size_total);
623 return err;
624 }
625
efifb_remove(struct platform_device * pdev)626 static int efifb_remove(struct platform_device *pdev)
627 {
628 struct fb_info *info = platform_get_drvdata(pdev);
629
630 /* efifb_destroy takes care of info cleanup */
631 unregister_framebuffer(info);
632 sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
633
634 return 0;
635 }
636
637 static struct platform_driver efifb_driver = {
638 .driver = {
639 .name = "efi-framebuffer",
640 },
641 .probe = efifb_probe,
642 .remove = efifb_remove,
643 };
644
645 builtin_platform_driver(efifb_driver);
646
647 #if defined(CONFIG_PCI)
648
record_efifb_bar_resource(struct pci_dev * dev,int idx,u64 offset)649 static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
650 {
651 u16 word;
652
653 efifb_pci_dev = dev;
654
655 pci_read_config_word(dev, PCI_COMMAND, &word);
656 if (!(word & PCI_COMMAND_MEMORY)) {
657 pci_dev_disabled = true;
658 dev_err(&dev->dev,
659 "BAR %d: assigned to efifb but device is disabled!\n",
660 idx);
661 return;
662 }
663
664 bar_resource = &dev->resource[idx];
665 bar_offset = offset;
666
667 dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
668 }
669
efifb_fixup_resources(struct pci_dev * dev)670 static void efifb_fixup_resources(struct pci_dev *dev)
671 {
672 u64 base = screen_info.lfb_base;
673 u64 size = screen_info.lfb_size;
674 int i;
675
676 if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
677 return;
678
679 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
680 base |= (u64)screen_info.ext_lfb_base << 32;
681
682 if (!base)
683 return;
684
685 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
686 struct resource *res = &dev->resource[i];
687
688 if (!(res->flags & IORESOURCE_MEM))
689 continue;
690
691 if (res->start <= base && res->end >= base + size - 1) {
692 record_efifb_bar_resource(dev, i, base - res->start);
693 break;
694 }
695 }
696 }
697 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
698 16, efifb_fixup_resources);
699
700 #endif
701