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efifb.c
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1 /*
2  * Framebuffer driver for EFI/UEFI based system
3  *
4  * (c) 2006 Edgar Hucek <[email protected]>
5  * Original efi driver written by Gerd Knorr <[email protected]>
6  *
7  */
8 
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/errno.h>
12 #include <linux/fb.h>
13 #include <linux/platform_device.h>
14 #include <linux/screen_info.h>
15 #include <linux/dmi.h>
16 #include <linux/pci.h>
17 #include <video/vga.h>
18 
19 static bool request_mem_succeeded = false;
20 
21 static struct pci_dev *default_vga;
22 
23 static struct fb_var_screeninfo efifb_defined __devinitdata = {
24  .activate = FB_ACTIVATE_NOW,
25  .height = -1,
26  .width = -1,
27  .right_margin = 32,
28  .upper_margin = 16,
29  .lower_margin = 4,
30  .vsync_len = 4,
31  .vmode = FB_VMODE_NONINTERLACED,
32 };
33 
34 static struct fb_fix_screeninfo efifb_fix __devinitdata = {
35  .id = "EFI VGA",
36  .type = FB_TYPE_PACKED_PIXELS,
37  .accel = FB_ACCEL_NONE,
38  .visual = FB_VISUAL_TRUECOLOR,
39 };
40 
41 enum {
42  M_I17, /* 17-Inch iMac */
43  M_I20, /* 20-Inch iMac */
44  M_I20_SR, /* 20-Inch iMac (Santa Rosa) */
45  M_I24, /* 24-Inch iMac */
46  M_I24_8_1, /* 24-Inch iMac, 8,1th gen */
47  M_I24_10_1, /* 24-Inch iMac, 10,1th gen */
48  M_I27_11_1, /* 27-Inch iMac, 11,1th gen */
49  M_MINI, /* Mac Mini */
50  M_MINI_3_1, /* Mac Mini, 3,1th gen */
51  M_MINI_4_1, /* Mac Mini, 4,1th gen */
52  M_MB, /* MacBook */
53  M_MB_2, /* MacBook, 2nd rev. */
54  M_MB_3, /* MacBook, 3rd rev. */
55  M_MB_5_1, /* MacBook, 5th rev. */
56  M_MB_6_1, /* MacBook, 6th rev. */
57  M_MB_7_1, /* MacBook, 7th rev. */
58  M_MB_SR, /* MacBook, 2nd gen, (Santa Rosa) */
59  M_MBA, /* MacBook Air */
60  M_MBA_3, /* Macbook Air, 3rd rev */
61  M_MBP, /* MacBook Pro */
62  M_MBP_2, /* MacBook Pro 2nd gen */
63  M_MBP_2_2, /* MacBook Pro 2,2nd gen */
64  M_MBP_SR, /* MacBook Pro (Santa Rosa) */
65  M_MBP_4, /* MacBook Pro, 4th gen */
66  M_MBP_5_1, /* MacBook Pro, 5,1th gen */
67  M_MBP_5_2, /* MacBook Pro, 5,2th gen */
68  M_MBP_5_3, /* MacBook Pro, 5,3rd gen */
69  M_MBP_6_1, /* MacBook Pro, 6,1th gen */
70  M_MBP_6_2, /* MacBook Pro, 6,2th gen */
71  M_MBP_7_1, /* MacBook Pro, 7,1th gen */
72  M_MBP_8_2, /* MacBook Pro, 8,2nd gen */
73  M_UNKNOWN /* placeholder */
74 };
75 
76 #define OVERRIDE_NONE 0x0
77 #define OVERRIDE_BASE 0x1
78 #define OVERRIDE_STRIDE 0x2
79 #define OVERRIDE_HEIGHT 0x4
80 #define OVERRIDE_WIDTH 0x8
81 
82 static struct efifb_dmi_info {
83  char *optname;
84  unsigned long base;
85  int stride;
86  int width;
87  int height;
88  int flags;
89 } dmi_list[] __initdata = {
90  [M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
91  [M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE }, /* guess */
92  [M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE },
93  [M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE }, /* guess */
94  [M_I24_8_1] = { "imac8", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
95  [M_I24_10_1] = { "imac10", 0xc0010000, 2048 * 4, 1920, 1080, OVERRIDE_NONE },
96  [M_I27_11_1] = { "imac11", 0xc0010000, 2560 * 4, 2560, 1440, OVERRIDE_NONE },
97  [M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768, OVERRIDE_NONE },
98  [M_MINI_3_1] = { "mini31", 0x40010000, 1024 * 4, 1024, 768, OVERRIDE_NONE },
99  [M_MINI_4_1] = { "mini41", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
100  [M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
101  [M_MB_5_1] = { "macbook51", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
102  [M_MB_6_1] = { "macbook61", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
103  [M_MB_7_1] = { "macbook71", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
104  [M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
105  /* 11" Macbook Air 3,1 passes the wrong stride */
106  [M_MBA_3] = { "mba3", 0, 2048 * 4, 0, 0, OVERRIDE_STRIDE },
107  [M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
108  [M_MBP_2] = { "mbp2", 0, 0, 0, 0, OVERRIDE_NONE }, /* placeholder */
109  [M_MBP_2_2] = { "mbp22", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
110  [M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
111  [M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
112  [M_MBP_5_1] = { "mbp51", 0xc0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
113  [M_MBP_5_2] = { "mbp52", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
114  [M_MBP_5_3] = { "mbp53", 0xd0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
115  [M_MBP_6_1] = { "mbp61", 0x90030000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
116  [M_MBP_6_2] = { "mbp62", 0x90030000, 2048 * 4, 1680, 1050, OVERRIDE_NONE },
117  [M_MBP_7_1] = { "mbp71", 0xc0010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
118  [M_MBP_8_2] = { "mbp82", 0x90010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
119  [M_UNKNOWN] = { NULL, 0, 0, 0, 0, OVERRIDE_NONE }
120 };
121 
122 static int set_system(const struct dmi_system_id *id);
123 
124 #define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid) \
125  { set_system, name, { \
126  DMI_MATCH(DMI_BIOS_VENDOR, vendor), \
127  DMI_MATCH(DMI_PRODUCT_NAME, name) }, \
128  &dmi_list[enumid] }
129 
130 static const struct dmi_system_id dmi_system_table[] __initconst = {
131  EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac4,1", M_I17),
132  /* At least one of these two will be right; maybe both? */
133  EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac5,1", M_I20),
134  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac5,1", M_I20),
135  /* At least one of these two will be right; maybe both? */
136  EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac6,1", M_I24),
137  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac6,1", M_I24),
138  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac7,1", M_I20_SR),
139  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac8,1", M_I24_8_1),
140  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac10,1", M_I24_10_1),
141  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac11,1", M_I27_11_1),
142  EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),
143  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini3,1", M_MINI_3_1),
144  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini4,1", M_MINI_4_1),
145  EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook1,1", M_MB),
146  /* At least one of these two will be right; maybe both? */
147  EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook2,1", M_MB),
148  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook2,1", M_MB),
149  /* At least one of these two will be right; maybe both? */
150  EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook3,1", M_MB),
151  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook3,1", M_MB),
152  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook4,1", M_MB),
153  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook5,1", M_MB_5_1),
154  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook6,1", M_MB_6_1),
155  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook7,1", M_MB_7_1),
156  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),
157  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir3,1", M_MBA_3),
158  EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro1,1", M_MBP),
159  EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,1", M_MBP_2),
160  EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,2", M_MBP_2_2),
161  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro2,1", M_MBP_2),
162  EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro3,1", M_MBP_SR),
163  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro3,1", M_MBP_SR),
164  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro4,1", M_MBP_4),
165  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,1", M_MBP_5_1),
166  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,2", M_MBP_5_2),
167  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,3", M_MBP_5_3),
168  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,1", M_MBP_6_1),
169  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,2", M_MBP_6_2),
170  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro7,1", M_MBP_7_1),
171  EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro8,2", M_MBP_8_2),
172  {},
173 };
174 
175 #define choose_value(dmivalue, fwvalue, field, flags) ({ \
176  typeof(fwvalue) _ret_ = fwvalue; \
177  if ((flags) & (field)) \
178  _ret_ = dmivalue; \
179  else if ((fwvalue) == 0) \
180  _ret_ = dmivalue; \
181  _ret_; \
182  })
183 
184 static int set_system(const struct dmi_system_id *id)
185 {
186  struct efifb_dmi_info *info = id->driver_data;
187 
188  if (info->base == 0 && info->height == 0 && info->width == 0
189  && info->stride == 0)
190  return 0;
191 
192  /* Trust the bootloader over the DMI tables */
193  if (screen_info.lfb_base == 0) {
194 #if defined(CONFIG_PCI)
195  struct pci_dev *dev = NULL;
196  int found_bar = 0;
197 #endif
198  if (info->base) {
199  screen_info.lfb_base = choose_value(info->base,
200  screen_info.lfb_base, OVERRIDE_BASE,
201  info->flags);
202 
203 #if defined(CONFIG_PCI)
204  /* make sure that the address in the table is actually
205  * on a VGA device's PCI BAR */
206 
207  for_each_pci_dev(dev) {
208  int i;
209  if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
210  continue;
211  for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
212  resource_size_t start, end;
213 
214  start = pci_resource_start(dev, i);
215  if (start == 0)
216  break;
217  end = pci_resource_end(dev, i);
218  if (screen_info.lfb_base >= start &&
219  screen_info.lfb_base < end) {
220  found_bar = 1;
221  }
222  }
223  }
224  if (!found_bar)
225  screen_info.lfb_base = 0;
226 #endif
227  }
228  }
229  if (screen_info.lfb_base) {
230  screen_info.lfb_linelength = choose_value(info->stride,
231  screen_info.lfb_linelength, OVERRIDE_STRIDE,
232  info->flags);
233  screen_info.lfb_width = choose_value(info->width,
234  screen_info.lfb_width, OVERRIDE_WIDTH,
235  info->flags);
236  screen_info.lfb_height = choose_value(info->height,
237  screen_info.lfb_height, OVERRIDE_HEIGHT,
238  info->flags);
239  if (screen_info.orig_video_isVGA == 0)
240  screen_info.orig_video_isVGA = VIDEO_TYPE_EFI;
241  } else {
242  screen_info.lfb_linelength = 0;
243  screen_info.lfb_width = 0;
244  screen_info.lfb_height = 0;
245  screen_info.orig_video_isVGA = 0;
246  return 0;
247  }
248 
249  printk(KERN_INFO "efifb: dmi detected %s - framebuffer at 0x%08x "
250  "(%dx%d, stride %d)\n", id->ident,
251  screen_info.lfb_base, screen_info.lfb_width,
252  screen_info.lfb_height, screen_info.lfb_linelength);
253 
254 
255  return 1;
256 }
257 
258 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
259  unsigned blue, unsigned transp,
260  struct fb_info *info)
261 {
262  /*
263  * Set a single color register. The values supplied are
264  * already rounded down to the hardware's capabilities
265  * (according to the entries in the `var' structure). Return
266  * != 0 for invalid regno.
267  */
268 
269  if (regno >= info->cmap.len)
270  return 1;
271 
272  if (regno < 16) {
273  red >>= 8;
274  green >>= 8;
275  blue >>= 8;
276  ((u32 *)(info->pseudo_palette))[regno] =
277  (red << info->var.red.offset) |
278  (green << info->var.green.offset) |
279  (blue << info->var.blue.offset);
280  }
281  return 0;
282 }
283 
284 static void efifb_destroy(struct fb_info *info)
285 {
286  if (info->screen_base)
287  iounmap(info->screen_base);
288  if (request_mem_succeeded)
289  release_mem_region(info->apertures->ranges[0].base,
290  info->apertures->ranges[0].size);
291  framebuffer_release(info);
292 }
293 
294 static struct fb_ops efifb_ops = {
295  .owner = THIS_MODULE,
296  .fb_destroy = efifb_destroy,
297  .fb_setcolreg = efifb_setcolreg,
298  .fb_fillrect = cfb_fillrect,
299  .fb_copyarea = cfb_copyarea,
300  .fb_imageblit = cfb_imageblit,
301 };
302 
303 struct pci_dev *vga_default_device(void)
304 {
305  return default_vga;
306 }
307 
308 EXPORT_SYMBOL_GPL(vga_default_device);
309 
310 void vga_set_default_device(struct pci_dev *pdev)
311 {
312  default_vga = pdev;
313 }
314 
315 static int __init efifb_setup(char *options)
316 {
317  char *this_opt;
318  int i;
319  struct pci_dev *dev = NULL;
320 
321  if (options && *options) {
322  while ((this_opt = strsep(&options, ",")) != NULL) {
323  if (!*this_opt) continue;
324 
325  for (i = 0; i < M_UNKNOWN; i++) {
326  if (!strcmp(this_opt, dmi_list[i].optname) &&
327  dmi_list[i].base != 0) {
328  screen_info.lfb_base = dmi_list[i].base;
329  screen_info.lfb_linelength = dmi_list[i].stride;
330  screen_info.lfb_width = dmi_list[i].width;
331  screen_info.lfb_height = dmi_list[i].height;
332  }
333  }
334  if (!strncmp(this_opt, "base:", 5))
335  screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
336  else if (!strncmp(this_opt, "stride:", 7))
337  screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
338  else if (!strncmp(this_opt, "height:", 7))
339  screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
340  else if (!strncmp(this_opt, "width:", 6))
341  screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
342  }
343  }
344 
345  for_each_pci_dev(dev) {
346  int i;
347 
348  if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
349  continue;
350 
351  for (i=0; i < DEVICE_COUNT_RESOURCE; i++) {
352  resource_size_t start, end;
353 
354  if (!(pci_resource_flags(dev, i) & IORESOURCE_MEM))
355  continue;
356 
357  start = pci_resource_start(dev, i);
358  end = pci_resource_end(dev, i);
359 
360  if (!start || !end)
361  continue;
362 
363  if (screen_info.lfb_base >= start &&
364  (screen_info.lfb_base + screen_info.lfb_size) < end)
365  default_vga = dev;
366  }
367  }
368 
369  return 0;
370 }
371 
372 static int __init efifb_probe(struct platform_device *dev)
373 {
374  struct fb_info *info;
375  int err;
376  unsigned int size_vmode;
377  unsigned int size_remap;
378  unsigned int size_total;
379 
380  if (!screen_info.lfb_depth)
381  screen_info.lfb_depth = 32;
382  if (!screen_info.pages)
383  screen_info.pages = 1;
384  if (!screen_info.lfb_base) {
385  printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
386  return -ENODEV;
387  }
388  printk(KERN_INFO "efifb: probing for efifb\n");
389 
390  /* just assume they're all unset if any are */
391  if (!screen_info.blue_size) {
392  screen_info.blue_size = 8;
393  screen_info.blue_pos = 0;
394  screen_info.green_size = 8;
395  screen_info.green_pos = 8;
396  screen_info.red_size = 8;
397  screen_info.red_pos = 16;
398  screen_info.rsvd_size = 8;
399  screen_info.rsvd_pos = 24;
400  }
401 
402  efifb_fix.smem_start = screen_info.lfb_base;
403  efifb_defined.bits_per_pixel = screen_info.lfb_depth;
404  efifb_defined.xres = screen_info.lfb_width;
405  efifb_defined.yres = screen_info.lfb_height;
406  efifb_fix.line_length = screen_info.lfb_linelength;
407 
408  /* size_vmode -- that is the amount of memory needed for the
409  * used video mode, i.e. the minimum amount of
410  * memory we need. */
411  size_vmode = efifb_defined.yres * efifb_fix.line_length;
412 
413  /* size_total -- all video memory we have. Used for
414  * entries, ressource allocation and bounds
415  * checking. */
416  size_total = screen_info.lfb_size;
417  if (size_total < size_vmode)
418  size_total = size_vmode;
419 
420  /* size_remap -- the amount of video memory we are going to
421  * use for efifb. With modern cards it is no
422  * option to simply use size_total as that
423  * wastes plenty of kernel address space. */
424  size_remap = size_vmode * 2;
425  if (size_remap > size_total)
426  size_remap = size_total;
427  if (size_remap % PAGE_SIZE)
428  size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
429  efifb_fix.smem_len = size_remap;
430 
431  if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
432  request_mem_succeeded = true;
433  } else {
434  /* We cannot make this fatal. Sometimes this comes from magic
435  spaces our resource handlers simply don't know about */
436  printk(KERN_WARNING
437  "efifb: cannot reserve video memory at 0x%lx\n",
438  efifb_fix.smem_start);
439  }
440 
441  info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
442  if (!info) {
443  printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
444  err = -ENOMEM;
445  goto err_release_mem;
446  }
447  info->pseudo_palette = info->par;
448  info->par = NULL;
449 
450  info->apertures = alloc_apertures(1);
451  if (!info->apertures) {
452  err = -ENOMEM;
453  goto err_release_fb;
454  }
455  info->apertures->ranges[0].base = efifb_fix.smem_start;
456  info->apertures->ranges[0].size = size_remap;
457 
458  info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);
459  if (!info->screen_base) {
460  printk(KERN_ERR "efifb: abort, cannot ioremap video memory "
461  "0x%x @ 0x%lx\n",
462  efifb_fix.smem_len, efifb_fix.smem_start);
463  err = -EIO;
464  goto err_release_fb;
465  }
466 
467  printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "
468  "using %dk, total %dk\n",
469  efifb_fix.smem_start, info->screen_base,
470  size_remap/1024, size_total/1024);
471  printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
472  efifb_defined.xres, efifb_defined.yres,
473  efifb_defined.bits_per_pixel, efifb_fix.line_length,
474  screen_info.pages);
475 
476  efifb_defined.xres_virtual = efifb_defined.xres;
477  efifb_defined.yres_virtual = efifb_fix.smem_len /
478  efifb_fix.line_length;
479  printk(KERN_INFO "efifb: scrolling: redraw\n");
480  efifb_defined.yres_virtual = efifb_defined.yres;
481 
482  /* some dummy values for timing to make fbset happy */
483  efifb_defined.pixclock = 10000000 / efifb_defined.xres *
484  1000 / efifb_defined.yres;
485  efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8;
486  efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8;
487 
488  efifb_defined.red.offset = screen_info.red_pos;
489  efifb_defined.red.length = screen_info.red_size;
490  efifb_defined.green.offset = screen_info.green_pos;
491  efifb_defined.green.length = screen_info.green_size;
492  efifb_defined.blue.offset = screen_info.blue_pos;
493  efifb_defined.blue.length = screen_info.blue_size;
494  efifb_defined.transp.offset = screen_info.rsvd_pos;
495  efifb_defined.transp.length = screen_info.rsvd_size;
496 
497  printk(KERN_INFO "efifb: %s: "
498  "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
499  "Truecolor",
500  screen_info.rsvd_size,
501  screen_info.red_size,
502  screen_info.green_size,
503  screen_info.blue_size,
504  screen_info.rsvd_pos,
505  screen_info.red_pos,
506  screen_info.green_pos,
507  screen_info.blue_pos);
508 
509  efifb_fix.ypanstep = 0;
510  efifb_fix.ywrapstep = 0;
511 
512  info->fbops = &efifb_ops;
513  info->var = efifb_defined;
514  info->fix = efifb_fix;
515  info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
516 
517  if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
518  printk(KERN_ERR "efifb: cannot allocate colormap\n");
519  goto err_unmap;
520  }
521  if ((err = register_framebuffer(info)) < 0) {
522  printk(KERN_ERR "efifb: cannot register framebuffer\n");
523  goto err_fb_dealoc;
524  }
525  printk(KERN_INFO "fb%d: %s frame buffer device\n",
526  info->node, info->fix.id);
527  return 0;
528 
529 err_fb_dealoc:
530  fb_dealloc_cmap(&info->cmap);
531 err_unmap:
532  iounmap(info->screen_base);
533 err_release_fb:
534  framebuffer_release(info);
535 err_release_mem:
536  if (request_mem_succeeded)
537  release_mem_region(efifb_fix.smem_start, size_total);
538  return err;
539 }
540 
541 static struct platform_driver efifb_driver = {
542  .driver = {
543  .name = "efifb",
544  },
545 };
546 
547 static struct platform_device efifb_device = {
548  .name = "efifb",
549 };
550 
551 static int __init efifb_init(void)
552 {
553  int ret;
554  char *option = NULL;
555 
556  if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI ||
557  !(screen_info.capabilities & VIDEO_CAPABILITY_SKIP_QUIRKS))
558  dmi_check_system(dmi_system_table);
559 
560  if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
561  return -ENODEV;
562 
563  if (fb_get_options("efifb", &option))
564  return -ENODEV;
565  efifb_setup(option);
566 
567  /* We don't get linelength from UGA Draw Protocol, only from
568  * EFI Graphics Protocol. So if it's not in DMI, and it's not
569  * passed in from the user, we really can't use the framebuffer.
570  */
571  if (!screen_info.lfb_linelength)
572  return -ENODEV;
573 
574  ret = platform_device_register(&efifb_device);
575  if (ret)
576  return ret;
577 
578  /*
579  * This is not just an optimization. We will interfere
580  * with a real driver if we get reprobed, so don't allow
581  * it.
582  */
583  ret = platform_driver_probe(&efifb_driver, efifb_probe);
584  if (ret) {
585  platform_device_unregister(&efifb_device);
586  return ret;
587  }
588 
589  return ret;
590 }
591 module_init(efifb_init);
592 
593 MODULE_LICENSE("GPL");
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