drivers/video/efifb.c

   1 /*
   2  * Framebuffer driver for EFI/UEFI based system
   3  *
   4  * (c) 2006 Edgar Hucek <gimli@dark-green.com>
   5  * Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
   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 = {
  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 = {
  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");