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10#include <linux/kernel.h>
11#include <linux/efi.h>
12#include <linux/errno.h>
13#include <linux/fb.h>
14#include <linux/pci.h>
15#include <linux/platform_device.h>
16#include <linux/screen_info.h>
17#include <video/vga.h>
18#include <asm/efi.h>
19#include <drm/drm_utils.h>
20#include <drm/drm_connector.h>
21
22static bool request_mem_succeeded = false;
23static bool nowc = false;
24
25static struct fb_var_screeninfo efifb_defined = {
26 .activate = FB_ACTIVATE_NOW,
27 .height = -1,
28 .width = -1,
29 .right_margin = 32,
30 .upper_margin = 16,
31 .lower_margin = 4,
32 .vsync_len = 4,
33 .vmode = FB_VMODE_NONINTERLACED,
34};
35
36static struct fb_fix_screeninfo efifb_fix = {
37 .id = "EFI VGA",
38 .type = FB_TYPE_PACKED_PIXELS,
39 .accel = FB_ACCEL_NONE,
40 .visual = FB_VISUAL_TRUECOLOR,
41};
42
43static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
44 unsigned blue, unsigned transp,
45 struct fb_info *info)
46{
47
48
49
50
51
52
53
54 if (regno >= info->cmap.len)
55 return 1;
56
57 if (regno < 16) {
58 red >>= 16 - info->var.red.length;
59 green >>= 16 - info->var.green.length;
60 blue >>= 16 - info->var.blue.length;
61 ((u32 *)(info->pseudo_palette))[regno] =
62 (red << info->var.red.offset) |
63 (green << info->var.green.offset) |
64 (blue << info->var.blue.offset);
65 }
66 return 0;
67}
68
69static void efifb_destroy(struct fb_info *info)
70{
71 if (info->screen_base)
72 iounmap(info->screen_base);
73 if (request_mem_succeeded)
74 release_mem_region(info->apertures->ranges[0].base,
75 info->apertures->ranges[0].size);
76 fb_dealloc_cmap(&info->cmap);
77}
78
79static struct fb_ops efifb_ops = {
80 .owner = THIS_MODULE,
81 .fb_destroy = efifb_destroy,
82 .fb_setcolreg = efifb_setcolreg,
83 .fb_fillrect = cfb_fillrect,
84 .fb_copyarea = cfb_copyarea,
85 .fb_imageblit = cfb_imageblit,
86};
87
88static int efifb_setup(char *options)
89{
90 char *this_opt;
91
92 if (options && *options) {
93 while ((this_opt = strsep(&options, ",")) != NULL) {
94 if (!*this_opt) continue;
95
96 efifb_setup_from_dmi(&screen_info, this_opt);
97
98 if (!strncmp(this_opt, "base:", 5))
99 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
100 else if (!strncmp(this_opt, "stride:", 7))
101 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
102 else if (!strncmp(this_opt, "height:", 7))
103 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
104 else if (!strncmp(this_opt, "width:", 6))
105 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
106 else if (!strcmp(this_opt, "nowc"))
107 nowc = true;
108 }
109 }
110
111 return 0;
112}
113
114static inline bool fb_base_is_valid(void)
115{
116 if (screen_info.lfb_base)
117 return true;
118
119 if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
120 return false;
121
122 if (screen_info.ext_lfb_base)
123 return true;
124
125 return false;
126}
127
128#define efifb_attr_decl(name, fmt) \
129static ssize_t name##_show(struct device *dev, \
130 struct device_attribute *attr, \
131 char *buf) \
132{ \
133 return sprintf(buf, fmt "\n", (screen_info.lfb_##name)); \
134} \
135static DEVICE_ATTR_RO(name)
136
137efifb_attr_decl(base, "0x%x");
138efifb_attr_decl(linelength, "%u");
139efifb_attr_decl(height, "%u");
140efifb_attr_decl(width, "%u");
141efifb_attr_decl(depth, "%u");
142
143static struct attribute *efifb_attrs[] = {
144 &dev_attr_base.attr,
145 &dev_attr_linelength.attr,
146 &dev_attr_width.attr,
147 &dev_attr_height.attr,
148 &dev_attr_depth.attr,
149 NULL
150};
151ATTRIBUTE_GROUPS(efifb);
152
153static bool pci_dev_disabled;
154
155static struct pci_dev *efifb_pci_dev;
156static struct resource *bar_resource;
157static u64 bar_offset;
158
159static int efifb_probe(struct platform_device *dev)
160{
161 struct fb_info *info;
162 int err, orientation;
163 unsigned int size_vmode;
164 unsigned int size_remap;
165 unsigned int size_total;
166 char *option = NULL;
167
168 if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
169 return -ENODEV;
170
171 if (fb_get_options("efifb", &option))
172 return -ENODEV;
173 efifb_setup(option);
174
175
176
177
178
179 if (!screen_info.lfb_linelength)
180 return -ENODEV;
181
182 if (!screen_info.lfb_depth)
183 screen_info.lfb_depth = 32;
184 if (!screen_info.pages)
185 screen_info.pages = 1;
186 if (!fb_base_is_valid()) {
187 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
188 return -ENODEV;
189 }
190 printk(KERN_INFO "efifb: probing for efifb\n");
191
192
193 if (!screen_info.blue_size) {
194 screen_info.blue_size = 8;
195 screen_info.blue_pos = 0;
196 screen_info.green_size = 8;
197 screen_info.green_pos = 8;
198 screen_info.red_size = 8;
199 screen_info.red_pos = 16;
200 screen_info.rsvd_size = 8;
201 screen_info.rsvd_pos = 24;
202 }
203
204 efifb_fix.smem_start = screen_info.lfb_base;
205
206 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
207 u64 ext_lfb_base;
208
209 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
210 efifb_fix.smem_start |= ext_lfb_base;
211 }
212
213 if (bar_resource &&
214 bar_resource->start + bar_offset != efifb_fix.smem_start) {
215 dev_info(&efifb_pci_dev->dev,
216 "BAR has moved, updating efifb address\n");
217 efifb_fix.smem_start = bar_resource->start + bar_offset;
218 }
219
220 efifb_defined.bits_per_pixel = screen_info.lfb_depth;
221 efifb_defined.xres = screen_info.lfb_width;
222 efifb_defined.yres = screen_info.lfb_height;
223 efifb_fix.line_length = screen_info.lfb_linelength;
224
225
226
227
228 size_vmode = efifb_defined.yres * efifb_fix.line_length;
229
230
231
232
233 size_total = screen_info.lfb_size;
234 if (size_total < size_vmode)
235 size_total = size_vmode;
236
237
238
239
240
241 size_remap = size_vmode * 2;
242 if (size_remap > size_total)
243 size_remap = size_total;
244 if (size_remap % PAGE_SIZE)
245 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
246 efifb_fix.smem_len = size_remap;
247
248 if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
249 request_mem_succeeded = true;
250 } else {
251
252
253 pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
254 efifb_fix.smem_start);
255 }
256
257 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
258 if (!info) {
259 pr_err("efifb: cannot allocate framebuffer\n");
260 err = -ENOMEM;
261 goto err_release_mem;
262 }
263 platform_set_drvdata(dev, info);
264 info->pseudo_palette = info->par;
265 info->par = NULL;
266
267 info->apertures = alloc_apertures(1);
268 if (!info->apertures) {
269 err = -ENOMEM;
270 goto err_release_fb;
271 }
272 info->apertures->ranges[0].base = efifb_fix.smem_start;
273 info->apertures->ranges[0].size = size_remap;
274
275 if (nowc)
276 info->screen_base = ioremap(efifb_fix.smem_start, efifb_fix.smem_len);
277 else
278 info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);
279 if (!info->screen_base) {
280 pr_err("efifb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
281 efifb_fix.smem_len, efifb_fix.smem_start);
282 err = -EIO;
283 goto err_release_fb;
284 }
285
286 pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
287 efifb_fix.smem_start, size_remap/1024, size_total/1024);
288 pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
289 efifb_defined.xres, efifb_defined.yres,
290 efifb_defined.bits_per_pixel, efifb_fix.line_length,
291 screen_info.pages);
292
293 efifb_defined.xres_virtual = efifb_defined.xres;
294 efifb_defined.yres_virtual = efifb_fix.smem_len /
295 efifb_fix.line_length;
296 pr_info("efifb: scrolling: redraw\n");
297 efifb_defined.yres_virtual = efifb_defined.yres;
298
299
300 efifb_defined.pixclock = 10000000 / efifb_defined.xres *
301 1000 / efifb_defined.yres;
302 efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8;
303 efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8;
304
305 efifb_defined.red.offset = screen_info.red_pos;
306 efifb_defined.red.length = screen_info.red_size;
307 efifb_defined.green.offset = screen_info.green_pos;
308 efifb_defined.green.length = screen_info.green_size;
309 efifb_defined.blue.offset = screen_info.blue_pos;
310 efifb_defined.blue.length = screen_info.blue_size;
311 efifb_defined.transp.offset = screen_info.rsvd_pos;
312 efifb_defined.transp.length = screen_info.rsvd_size;
313
314 pr_info("efifb: %s: "
315 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
316 "Truecolor",
317 screen_info.rsvd_size,
318 screen_info.red_size,
319 screen_info.green_size,
320 screen_info.blue_size,
321 screen_info.rsvd_pos,
322 screen_info.red_pos,
323 screen_info.green_pos,
324 screen_info.blue_pos);
325
326 efifb_fix.ypanstep = 0;
327 efifb_fix.ywrapstep = 0;
328
329 info->fbops = &efifb_ops;
330 info->var = efifb_defined;
331 info->fix = efifb_fix;
332 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
333
334 orientation = drm_get_panel_orientation_quirk(efifb_defined.xres,
335 efifb_defined.yres);
336 switch (orientation) {
337 default:
338 info->fbcon_rotate_hint = FB_ROTATE_UR;
339 break;
340 case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
341 info->fbcon_rotate_hint = FB_ROTATE_UD;
342 break;
343 case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
344 info->fbcon_rotate_hint = FB_ROTATE_CCW;
345 break;
346 case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
347 info->fbcon_rotate_hint = FB_ROTATE_CW;
348 break;
349 }
350
351 err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
352 if (err) {
353 pr_err("efifb: cannot add sysfs attrs\n");
354 goto err_unmap;
355 }
356 err = fb_alloc_cmap(&info->cmap, 256, 0);
357 if (err < 0) {
358 pr_err("efifb: cannot allocate colormap\n");
359 goto err_groups;
360 }
361 err = register_framebuffer(info);
362 if (err < 0) {
363 pr_err("efifb: cannot register framebuffer\n");
364 goto err_fb_dealoc;
365 }
366 fb_info(info, "%s frame buffer device\n", info->fix.id);
367 return 0;
368
369err_fb_dealoc:
370 fb_dealloc_cmap(&info->cmap);
371err_groups:
372 sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
373err_unmap:
374 iounmap(info->screen_base);
375err_release_fb:
376 framebuffer_release(info);
377err_release_mem:
378 if (request_mem_succeeded)
379 release_mem_region(efifb_fix.smem_start, size_total);
380 return err;
381}
382
383static int efifb_remove(struct platform_device *pdev)
384{
385 struct fb_info *info = platform_get_drvdata(pdev);
386
387 unregister_framebuffer(info);
388 sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
389 framebuffer_release(info);
390
391 return 0;
392}
393
394static struct platform_driver efifb_driver = {
395 .driver = {
396 .name = "efi-framebuffer",
397 },
398 .probe = efifb_probe,
399 .remove = efifb_remove,
400};
401
402builtin_platform_driver(efifb_driver);
403
404#if defined(CONFIG_PCI)
405
406static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
407{
408 u16 word;
409
410 efifb_pci_dev = dev;
411
412 pci_read_config_word(dev, PCI_COMMAND, &word);
413 if (!(word & PCI_COMMAND_MEMORY)) {
414 pci_dev_disabled = true;
415 dev_err(&dev->dev,
416 "BAR %d: assigned to efifb but device is disabled!\n",
417 idx);
418 return;
419 }
420
421 bar_resource = &dev->resource[idx];
422 bar_offset = offset;
423
424 dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
425}
426
427static void efifb_fixup_resources(struct pci_dev *dev)
428{
429 u64 base = screen_info.lfb_base;
430 u64 size = screen_info.lfb_size;
431 int i;
432
433 if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
434 return;
435
436 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
437 base |= (u64)screen_info.ext_lfb_base << 32;
438
439 if (!base)
440 return;
441
442 for (i = 0; i <= PCI_STD_RESOURCE_END; i++) {
443 struct resource *res = &dev->resource[i];
444
445 if (!(res->flags & IORESOURCE_MEM))
446 continue;
447
448 if (res->start <= base && res->end >= base + size - 1) {
449 record_efifb_bar_resource(dev, i, base - res->start);
450 break;
451 }
452 }
453}
454DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
455 16, efifb_fixup_resources);
456
457#endif
458
