1 // SPDX-License-Identifier: GPL-2.0
3 * Framebuffer driver for EFI/UEFI based system
5 * (c) 2006 Edgar Hucek <gimli@dark-green.com>
6 * Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
10 #include <linux/kernel.h>
11 #include <linux/efi.h>
12 #include <linux/efi-bgrt.h>
13 #include <linux/errno.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>
21 #include <drm/drm_utils.h> /* For drm_get_panel_orientation_quirk */
22 #include <drm/drm_connector.h> /* For DRM_MODE_PANEL_ORIENTATION_* */
24 struct bmp_file_header
{
31 struct bmp_dib_header
{
45 static bool request_mem_succeeded
= false;
46 static u64 mem_flags
= EFI_MEMORY_WC
| EFI_MEMORY_UC
;
48 static struct fb_var_screeninfo efifb_defined
= {
49 .activate
= FB_ACTIVATE_NOW
,
56 .vmode
= FB_VMODE_NONINTERLACED
,
59 static struct fb_fix_screeninfo efifb_fix
= {
61 .type
= FB_TYPE_PACKED_PIXELS
,
62 .accel
= FB_ACCEL_NONE
,
63 .visual
= FB_VISUAL_TRUECOLOR
,
66 static int efifb_setcolreg(unsigned regno
, unsigned red
, unsigned green
,
67 unsigned blue
, unsigned transp
,
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.
77 if (regno
>= info
->cmap
.len
)
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
);
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.
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
)
108 *dst
++ = (r
<< si
->red_pos
) |
109 (g
<< si
->green_pos
) |
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.
122 static bool efifb_bgrt_sanity_check(struct screen_info
*si
, u32 bmp_width
)
124 static const int default_resolutions
[][2] = {
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
)
136 /* If not a default resolution used for textmode, this should be fine */
137 if (i
>= ARRAY_SIZE(default_resolutions
))
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))
148 static bool efifb_bgrt_sanity_check(struct screen_info
*si
, u32 bmp_width
)
154 static void efifb_show_boot_graphics(struct fb_info
*info
)
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
;
163 if (!bgrt_tab
.image_address
) {
164 pr_info("efifb: No BGRT, not showing boot graphics\n");
168 /* Avoid flashing the logo if we're going to print std probe messages */
169 if (console_loglevel
> CONSOLE_LOGLEVEL_QUIET
)
172 /* bgrt_tab.status is unreliable, so we don't check it */
174 if (si
->lfb_depth
!= 32) {
175 pr_info("efifb: not 32 bits, not showing boot graphics\n");
179 bgrt_image
= memremap(bgrt_tab
.image_address
, bgrt_image_size
,
182 pr_warn("efifb: Ignoring BGRT: failed to map image memory\n");
186 if (bgrt_image_size
< (sizeof(*file_header
) + sizeof(*dib_header
)))
189 file_header
= bgrt_image
;
190 if (file_header
->id
!= 0x4d42 || file_header
->reserved
!= 0)
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)
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
;
204 if ((file_header
->bitmap_offset
+ bmp_pitch
* bmp_height
) >
208 if ((bgrt_tab
.image_offset_x
+ bmp_width
) > si
->lfb_width
||
209 (bgrt_tab
.image_offset_y
+ bmp_height
) > si
->lfb_height
)
212 if (!efifb_bgrt_sanity_check(si
, bmp_width
))
215 pr_info("efifb: showing boot graphics\n");
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
);
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
;
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
+
234 (u32
*)dst
+ dst_x
, bmp_width
, si
);
236 memset((u32
*)dst
+ dst_x
, 0, (si
->lfb_width
- dst_x
) * 4);
239 memunmap(bgrt_image
);
243 memunmap(bgrt_image
);
244 pr_warn("efifb: Ignoring BGRT: unexpected or invalid BMP data\n");
247 static inline void efifb_show_boot_graphics(struct fb_info
*info
) {}
250 static void efifb_destroy(struct fb_info
*info
)
252 if (info
->screen_base
) {
253 if (mem_flags
& (EFI_MEMORY_UC
| EFI_MEMORY_WC
))
254 iounmap(info
->screen_base
);
256 memunmap(info
->screen_base
);
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
);
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
,
273 static int efifb_setup(char *options
)
277 if (options
&& *options
) {
278 while ((this_opt
= strsep(&options
, ",")) != NULL
) {
279 if (!*this_opt
) continue;
281 efifb_setup_from_dmi(&screen_info
, this_opt
);
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
;
299 static inline bool fb_base_is_valid(void)
301 if (screen_info
.lfb_base
)
304 if (!(screen_info
.capabilities
& VIDEO_CAPABILITY_64BIT_BASE
))
307 if (screen_info
.ext_lfb_base
)
313 #define efifb_attr_decl(name, fmt) \
314 static ssize_t name##_show(struct device *dev, \
315 struct device_attribute *attr, \
318 return sprintf(buf, fmt "\n", (screen_info.lfb_##name)); \
320 static DEVICE_ATTR_RO(name)
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");
328 static struct attribute
*efifb_attrs
[] = {
330 &dev_attr_linelength
.attr
,
331 &dev_attr_width
.attr
,
332 &dev_attr_height
.attr
,
333 &dev_attr_depth
.attr
,
336 ATTRIBUTE_GROUPS(efifb
);
338 static bool pci_dev_disabled
; /* FB base matches BAR of a disabled device */
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
;
344 static int efifb_probe(struct platform_device
*dev
)
346 struct fb_info
*info
;
347 int err
, orientation
;
348 unsigned int size_vmode
;
349 unsigned int size_remap
;
350 unsigned int size_total
;
352 efi_memory_desc_t md
;
354 if (screen_info
.orig_video_isVGA
!= VIDEO_TYPE_EFI
|| pci_dev_disabled
)
357 if (fb_get_options("efifb", &option
))
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.
365 if (!screen_info
.lfb_linelength
)
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");
376 printk(KERN_INFO
"efifb: probing for efifb\n");
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;
390 efifb_fix
.smem_start
= screen_info
.lfb_base
;
392 if (screen_info
.capabilities
& VIDEO_CAPABILITY_64BIT_BASE
) {
395 ext_lfb_base
= (u64
)(unsigned long)screen_info
.ext_lfb_base
<< 32;
396 efifb_fix
.smem_start
|= ext_lfb_base
;
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
;
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
;
411 /* size_vmode -- that is the amount of memory needed for the
412 * used video mode, i.e. the minimum amount of
414 size_vmode
= efifb_defined
.yres
* efifb_fix
.line_length
;
416 /* size_total -- all video memory we have. Used for
417 * entries, ressource allocation and bounds
419 size_total
= screen_info
.lfb_size
;
420 if (size_total
< size_vmode
)
421 size_total
= size_vmode
;
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
;
434 if (request_mem_region(efifb_fix
.smem_start
, size_remap
, "efifb")) {
435 request_mem_succeeded
= true;
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
);
443 info
= framebuffer_alloc(sizeof(u32
) * 16, &dev
->dev
);
445 pr_err("efifb: cannot allocate framebuffer\n");
447 goto err_release_mem
;
449 platform_set_drvdata(dev
, info
);
450 info
->pseudo_palette
= info
->par
;
453 info
->apertures
= alloc_apertures(1);
454 if (!info
->apertures
) {
458 info
->apertures
->ranges
[0].base
= efifb_fix
.smem_start
;
459 info
->apertures
->ranges
[0].size
= size_remap
;
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
);
470 * If the UEFI memory map covers the efifb region, we may only
471 * remap it using the attributes the memory map prescribes.
473 mem_flags
|= EFI_MEMORY_WT
| EFI_MEMORY_WB
;
474 mem_flags
&= md
.attribute
;
476 if (mem_flags
& EFI_MEMORY_WC
)
477 info
->screen_base
= ioremap_wc(efifb_fix
.smem_start
,
479 else if (mem_flags
& EFI_MEMORY_UC
)
480 info
->screen_base
= ioremap(efifb_fix
.smem_start
,
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
);
495 efifb_show_boot_graphics(info
);
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
,
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
;
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;
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
;
525 pr_info("efifb: %s: "
526 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
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
,
534 screen_info
.green_pos
,
535 screen_info
.blue_pos
);
537 efifb_fix
.ypanstep
= 0;
538 efifb_fix
.ywrapstep
= 0;
540 info
->fbops
= &efifb_ops
;
541 info
->var
= efifb_defined
;
542 info
->fix
= efifb_fix
;
543 info
->flags
= FBINFO_FLAG_DEFAULT
| FBINFO_MISC_FIRMWARE
;
545 orientation
= drm_get_panel_orientation_quirk(efifb_defined
.xres
,
547 switch (orientation
) {
549 info
->fbcon_rotate_hint
= FB_ROTATE_UR
;
551 case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP
:
552 info
->fbcon_rotate_hint
= FB_ROTATE_UD
;
554 case DRM_MODE_PANEL_ORIENTATION_LEFT_UP
:
555 info
->fbcon_rotate_hint
= FB_ROTATE_CCW
;
557 case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP
:
558 info
->fbcon_rotate_hint
= FB_ROTATE_CW
;
562 err
= sysfs_create_groups(&dev
->dev
.kobj
, efifb_groups
);
564 pr_err("efifb: cannot add sysfs attrs\n");
567 err
= fb_alloc_cmap(&info
->cmap
, 256, 0);
569 pr_err("efifb: cannot allocate colormap\n");
572 err
= register_framebuffer(info
);
574 pr_err("efifb: cannot register framebuffer\n");
577 fb_info(info
, "%s frame buffer device\n", info
->fix
.id
);
581 fb_dealloc_cmap(&info
->cmap
);
583 sysfs_remove_groups(&dev
->dev
.kobj
, efifb_groups
);
585 if (mem_flags
& (EFI_MEMORY_UC
| EFI_MEMORY_WC
))
586 iounmap(info
->screen_base
);
588 memunmap(info
->screen_base
);
590 framebuffer_release(info
);
592 if (request_mem_succeeded
)
593 release_mem_region(efifb_fix
.smem_start
, size_total
);
597 static int efifb_remove(struct platform_device
*pdev
)
599 struct fb_info
*info
= platform_get_drvdata(pdev
);
601 unregister_framebuffer(info
);
602 sysfs_remove_groups(&pdev
->dev
.kobj
, efifb_groups
);
603 framebuffer_release(info
);
608 static struct platform_driver efifb_driver
= {
610 .name
= "efi-framebuffer",
612 .probe
= efifb_probe
,
613 .remove
= efifb_remove
,
616 builtin_platform_driver(efifb_driver
);
618 #if defined(CONFIG_PCI)
620 static void record_efifb_bar_resource(struct pci_dev
*dev
, int idx
, u64 offset
)
626 pci_read_config_word(dev
, PCI_COMMAND
, &word
);
627 if (!(word
& PCI_COMMAND_MEMORY
)) {
628 pci_dev_disabled
= true;
630 "BAR %d: assigned to efifb but device is disabled!\n",
635 bar_resource
= &dev
->resource
[idx
];
638 dev_info(&dev
->dev
, "BAR %d: assigned to efifb\n", idx
);
641 static void efifb_fixup_resources(struct pci_dev
*dev
)
643 u64 base
= screen_info
.lfb_base
;
644 u64 size
= screen_info
.lfb_size
;
647 if (efifb_pci_dev
|| screen_info
.orig_video_isVGA
!= VIDEO_TYPE_EFI
)
650 if (screen_info
.capabilities
& VIDEO_CAPABILITY_64BIT_BASE
)
651 base
|= (u64
)screen_info
.ext_lfb_base
<< 32;
656 for (i
= 0; i
<= PCI_STD_RESOURCE_END
; i
++) {
657 struct resource
*res
= &dev
->resource
[i
];
659 if (!(res
->flags
& IORESOURCE_MEM
))
662 if (res
->start
<= base
&& res
->end
>= base
+ size
- 1) {
663 record_efifb_bar_resource(dev
, i
, base
- res
->start
);
668 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID
, PCI_ANY_ID
, PCI_BASE_CLASS_DISPLAY
,
669 16, efifb_fixup_resources
);