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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>
23#include <drm/drm_connector.h>
24
25struct bmp_file_header {
26 u16 id;
27 u32 file_size;
28 u32 reserved;
29 u32 bitmap_offset;
30} __packed;
31
32struct 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
46static bool use_bgrt = true;
47static bool request_mem_succeeded = false;
48static u64 mem_flags = EFI_MEMORY_WC | EFI_MEMORY_UC;
49
50static struct fb_var_screeninfo efifb_defined = {
51 .activate = FB_ACTIVATE_NOW,
52 .height = -1,
53 .width = -1,
54 .right_margin = 32,
55 .upper_margin = 16,
56 .lower_margin = 4,
57 .vsync_len = 4,
58 .vmode = FB_VMODE_NONINTERLACED,
59};
60
61static struct fb_fix_screeninfo efifb_fix = {
62 .id = "EFI VGA",
63 .type = FB_TYPE_PACKED_PIXELS,
64 .accel = FB_ACCEL_NONE,
65 .visual = FB_VISUAL_TRUECOLOR,
66};
67
68static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
69 unsigned blue, unsigned transp,
70 struct fb_info *info)
71{
72
73
74
75
76
77
78
79 if (regno >= info->cmap.len)
80 return 1;
81
82 if (regno < 16) {
83 red >>= 16 - info->var.red.length;
84 green >>= 16 - info->var.green.length;
85 blue >>= 16 - info->var.blue.length;
86 ((u32 *)(info->pseudo_palette))[regno] =
87 (red << info->var.red.offset) |
88 (green << info->var.green.offset) |
89 (blue << info->var.blue.offset);
90 }
91 return 0;
92}
93
94
95
96
97
98
99
100#if defined CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER && \
101 defined CONFIG_ACPI_BGRT
102static void efifb_copy_bmp(u8 *src, u32 *dst, int width, struct screen_info *si)
103{
104 u8 r, g, b;
105
106 while (width--) {
107 b = *src++;
108 g = *src++;
109 r = *src++;
110 *dst++ = (r << si->red_pos) |
111 (g << si->green_pos) |
112 (b << si->blue_pos);
113 }
114}
115
116#ifdef CONFIG_X86
117
118
119
120
121
122
123
124static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
125{
126
127
128
129
130 u32 expected_xoffset = (si->lfb_width - bmp_width) / 2;
131
132 return bgrt_tab.image_offset_x == expected_xoffset;
133}
134#else
135static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
136{
137 return true;
138}
139#endif
140
141static void efifb_show_boot_graphics(struct fb_info *info)
142{
143 u32 bmp_width, bmp_height, bmp_pitch, dst_x, y, src_y;
144 struct screen_info *si = &screen_info;
145 struct bmp_file_header *file_header;
146 struct bmp_dib_header *dib_header;
147 void *bgrt_image = NULL;
148 u8 *dst = info->screen_base;
149
150 if (!use_bgrt)
151 return;
152
153 if (!bgrt_tab.image_address) {
154 pr_info("efifb: No BGRT, not showing boot graphics\n");
155 return;
156 }
157
158 if (bgrt_tab.status & 0x06) {
159 pr_info("efifb: BGRT rotation bits set, not showing boot graphics\n");
160 return;
161 }
162
163
164 if (console_loglevel > CONSOLE_LOGLEVEL_QUIET)
165 return;
166
167
168
169 if (si->lfb_depth != 32) {
170 pr_info("efifb: not 32 bits, not showing boot graphics\n");
171 return;
172 }
173
174 bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
175 MEMREMAP_WB);
176 if (!bgrt_image) {
177 pr_warn("efifb: Ignoring BGRT: failed to map image memory\n");
178 return;
179 }
180
181 if (bgrt_image_size < (sizeof(*file_header) + sizeof(*dib_header)))
182 goto error;
183
184 file_header = bgrt_image;
185 if (file_header->id != 0x4d42 || file_header->reserved != 0)
186 goto error;
187
188 dib_header = bgrt_image + sizeof(*file_header);
189 if (dib_header->dib_header_size != 40 || dib_header->width < 0 ||
190 dib_header->planes != 1 || dib_header->bpp != 24 ||
191 dib_header->compression != 0)
192 goto error;
193
194 bmp_width = dib_header->width;
195 bmp_height = abs(dib_header->height);
196 bmp_pitch = round_up(3 * bmp_width, 4);
197
198 if ((file_header->bitmap_offset + bmp_pitch * bmp_height) >
199 bgrt_image_size)
200 goto error;
201
202 if ((bgrt_tab.image_offset_x + bmp_width) > si->lfb_width ||
203 (bgrt_tab.image_offset_y + bmp_height) > si->lfb_height)
204 goto error;
205
206 if (!efifb_bgrt_sanity_check(si, bmp_width))
207 goto error;
208
209 pr_info("efifb: showing boot graphics\n");
210
211 for (y = 0; y < si->lfb_height; y++, dst += si->lfb_linelength) {
212
213 if (y < bgrt_tab.image_offset_y ||
214 y >= (bgrt_tab.image_offset_y + bmp_height)) {
215 memset(dst, 0, 4 * si->lfb_width);
216 continue;
217 }
218
219 src_y = y - bgrt_tab.image_offset_y;
220
221 if (dib_header->height > 0)
222 src_y = (bmp_height - 1) - src_y;
223
224 memset(dst, 0, bgrt_tab.image_offset_x * 4);
225 dst_x = bgrt_tab.image_offset_x;
226 efifb_copy_bmp(bgrt_image + file_header->bitmap_offset +
227 src_y * bmp_pitch,
228 (u32 *)dst + dst_x, bmp_width, si);
229 dst_x += bmp_width;
230 memset((u32 *)dst + dst_x, 0, (si->lfb_width - dst_x) * 4);
231 }
232
233 memunmap(bgrt_image);
234 return;
235
236error:
237 memunmap(bgrt_image);
238 pr_warn("efifb: Ignoring BGRT: unexpected or invalid BMP data\n");
239}
240#else
241static inline void efifb_show_boot_graphics(struct fb_info *info) {}
242#endif
243
244static void efifb_destroy(struct fb_info *info)
245{
246 if (info->screen_base) {
247 if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
248 iounmap(info->screen_base);
249 else
250 memunmap(info->screen_base);
251 }
252 if (request_mem_succeeded)
253 release_mem_region(info->apertures->ranges[0].base,
254 info->apertures->ranges[0].size);
255 fb_dealloc_cmap(&info->cmap);
256}
257
258static const struct fb_ops efifb_ops = {
259 .owner = THIS_MODULE,
260 .fb_destroy = efifb_destroy,
261 .fb_setcolreg = efifb_setcolreg,
262 .fb_fillrect = cfb_fillrect,
263 .fb_copyarea = cfb_copyarea,
264 .fb_imageblit = cfb_imageblit,
265};
266
267static int efifb_setup(char *options)
268{
269 char *this_opt;
270
271 if (options && *options) {
272 while ((this_opt = strsep(&options, ",")) != NULL) {
273 if (!*this_opt) continue;
274
275 efifb_setup_from_dmi(&screen_info, this_opt);
276
277 if (!strncmp(this_opt, "base:", 5))
278 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
279 else if (!strncmp(this_opt, "stride:", 7))
280 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
281 else if (!strncmp(this_opt, "height:", 7))
282 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
283 else if (!strncmp(this_opt, "width:", 6))
284 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
285 else if (!strcmp(this_opt, "nowc"))
286 mem_flags &= ~EFI_MEMORY_WC;
287 else if (!strcmp(this_opt, "nobgrt"))
288 use_bgrt = false;
289 }
290 }
291
292 return 0;
293}
294
295static inline bool fb_base_is_valid(void)
296{
297 if (screen_info.lfb_base)
298 return true;
299
300 if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
301 return false;
302
303 if (screen_info.ext_lfb_base)
304 return true;
305
306 return false;
307}
308
309#define efifb_attr_decl(name, fmt) \
310static ssize_t name##_show(struct device *dev, \
311 struct device_attribute *attr, \
312 char *buf) \
313{ \
314 return sprintf(buf, fmt "\n", (screen_info.lfb_##name)); \
315} \
316static DEVICE_ATTR_RO(name)
317
318efifb_attr_decl(base, "0x%x");
319efifb_attr_decl(linelength, "%u");
320efifb_attr_decl(height, "%u");
321efifb_attr_decl(width, "%u");
322efifb_attr_decl(depth, "%u");
323
324static struct attribute *efifb_attrs[] = {
325 &dev_attr_base.attr,
326 &dev_attr_linelength.attr,
327 &dev_attr_width.attr,
328 &dev_attr_height.attr,
329 &dev_attr_depth.attr,
330 NULL
331};
332ATTRIBUTE_GROUPS(efifb);
333
334static bool pci_dev_disabled;
335
336static struct pci_dev *efifb_pci_dev;
337static struct resource *bar_resource;
338static u64 bar_offset;
339
340static int efifb_probe(struct platform_device *dev)
341{
342 struct fb_info *info;
343 int err, orientation;
344 unsigned int size_vmode;
345 unsigned int size_remap;
346 unsigned int size_total;
347 char *option = NULL;
348 efi_memory_desc_t md;
349
350 if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
351 return -ENODEV;
352
353 if (fb_get_options("efifb", &option))
354 return -ENODEV;
355 efifb_setup(option);
356
357
358
359
360
361 if (!screen_info.lfb_linelength)
362 return -ENODEV;
363
364 if (!screen_info.lfb_depth)
365 screen_info.lfb_depth = 32;
366 if (!screen_info.pages)
367 screen_info.pages = 1;
368 if (!fb_base_is_valid()) {
369 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
370 return -ENODEV;
371 }
372 printk(KERN_INFO "efifb: probing for efifb\n");
373
374
375 if (!screen_info.blue_size) {
376 screen_info.blue_size = 8;
377 screen_info.blue_pos = 0;
378 screen_info.green_size = 8;
379 screen_info.green_pos = 8;
380 screen_info.red_size = 8;
381 screen_info.red_pos = 16;
382 screen_info.rsvd_size = 8;
383 screen_info.rsvd_pos = 24;
384 }
385
386 efifb_fix.smem_start = screen_info.lfb_base;
387
388 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
389 u64 ext_lfb_base;
390
391 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
392 efifb_fix.smem_start |= ext_lfb_base;
393 }
394
395 if (bar_resource &&
396 bar_resource->start + bar_offset != efifb_fix.smem_start) {
397 dev_info(&efifb_pci_dev->dev,
398 "BAR has moved, updating efifb address\n");
399 efifb_fix.smem_start = bar_resource->start + bar_offset;
400 }
401
402 efifb_defined.bits_per_pixel = screen_info.lfb_depth;
403 efifb_defined.xres = screen_info.lfb_width;
404 efifb_defined.yres = screen_info.lfb_height;
405 efifb_fix.line_length = screen_info.lfb_linelength;
406
407
408
409
410 size_vmode = efifb_defined.yres * efifb_fix.line_length;
411
412
413
414
415 size_total = screen_info.lfb_size;
416 if (size_total < size_vmode)
417 size_total = size_vmode;
418
419
420
421
422
423 size_remap = size_vmode * 2;
424 if (size_remap > size_total)
425 size_remap = size_total;
426 if (size_remap % PAGE_SIZE)
427 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
428 efifb_fix.smem_len = size_remap;
429
430 if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
431 request_mem_succeeded = true;
432 } else {
433
434
435 pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
436 efifb_fix.smem_start);
437 }
438
439 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
440 if (!info) {
441 err = -ENOMEM;
442 goto err_release_mem;
443 }
444 platform_set_drvdata(dev, info);
445 info->pseudo_palette = info->par;
446 info->par = NULL;
447
448 info->apertures = alloc_apertures(1);
449 if (!info->apertures) {
450 err = -ENOMEM;
451 goto err_release_fb;
452 }
453 info->apertures->ranges[0].base = efifb_fix.smem_start;
454 info->apertures->ranges[0].size = size_remap;
455
456 if (efi_enabled(EFI_MEMMAP) &&
457 !efi_mem_desc_lookup(efifb_fix.smem_start, &md)) {
458 if ((efifb_fix.smem_start + efifb_fix.smem_len) >
459 (md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT))) {
460 pr_err("efifb: video memory @ 0x%lx spans multiple EFI memory regions\n",
461 efifb_fix.smem_start);
462 err = -EIO;
463 goto err_release_fb;
464 }
465
466
467
468
469 md.attribute &= EFI_MEMORY_UC | EFI_MEMORY_WC |
470 EFI_MEMORY_WT | EFI_MEMORY_WB;
471 if (md.attribute) {
472 mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB;
473 mem_flags &= md.attribute;
474 }
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
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 if (efifb_pci_dev)
579 pm_runtime_get_sync(&efifb_pci_dev->dev);
580 return 0;
581
582err_fb_dealoc:
583 fb_dealloc_cmap(&info->cmap);
584err_groups:
585 sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
586err_unmap:
587 if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
588 iounmap(info->screen_base);
589 else
590 memunmap(info->screen_base);
591err_release_fb:
592 framebuffer_release(info);
593err_release_mem:
594 if (request_mem_succeeded)
595 release_mem_region(efifb_fix.smem_start, size_total);
596 return err;
597}
598
599static int efifb_remove(struct platform_device *pdev)
600{
601 struct fb_info *info = platform_get_drvdata(pdev);
602
603 unregister_framebuffer(info);
604 sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
605 framebuffer_release(info);
606 if (efifb_pci_dev)
607 pm_runtime_put(&efifb_pci_dev->dev);
608
609 return 0;
610}
611
612static struct platform_driver efifb_driver = {
613 .driver = {
614 .name = "efi-framebuffer",
615 },
616 .probe = efifb_probe,
617 .remove = efifb_remove,
618};
619
620builtin_platform_driver(efifb_driver);
621
622#if defined(CONFIG_PCI)
623
624static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
625{
626 u16 word;
627
628 efifb_pci_dev = dev;
629
630 pci_read_config_word(dev, PCI_COMMAND, &word);
631 if (!(word & PCI_COMMAND_MEMORY)) {
632 pci_dev_disabled = true;
633 dev_err(&dev->dev,
634 "BAR %d: assigned to efifb but device is disabled!\n",
635 idx);
636 return;
637 }
638
639 bar_resource = &dev->resource[idx];
640 bar_offset = offset;
641
642 dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
643}
644
645static void efifb_fixup_resources(struct pci_dev *dev)
646{
647 u64 base = screen_info.lfb_base;
648 u64 size = screen_info.lfb_size;
649 int i;
650
651 if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
652 return;
653
654 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
655 base |= (u64)screen_info.ext_lfb_base << 32;
656
657 if (!base)
658 return;
659
660 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
661 struct resource *res = &dev->resource[i];
662
663 if (!(res->flags & IORESOURCE_MEM))
664 continue;
665
666 if (res->start <= base && res->end >= base + size - 1) {
667 record_efifb_bar_resource(dev, i, base - res->start);
668 break;
669 }
670 }
671}
672DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
673 16, efifb_fixup_resources);
674
675#endif
676
