linux/drivers/video/efifb.c
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   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
  19static bool request_mem_succeeded = false;
  20
  21static struct pci_dev *default_vga;
  22
  23static 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
  34static 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
  41enum {
  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
  82static 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
 122static 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
 130static 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
 184static 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
 258static 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
 284static 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
 294static 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
 303struct pci_dev *vga_default_device(void)
 304{
 305        return default_vga;
 306}
 307
 308EXPORT_SYMBOL_GPL(vga_default_device);
 309
 310void vga_set_default_device(struct pci_dev *pdev)
 311{
 312        default_vga = pdev;
 313}
 314
 315static 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
 372static 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
 529err_fb_dealoc:
 530        fb_dealloc_cmap(&info->cmap);
 531err_unmap:
 532        iounmap(info->screen_base);
 533err_release_fb:
 534        framebuffer_release(info);
 535err_release_mem:
 536        if (request_mem_succeeded)
 537                release_mem_region(efifb_fix.smem_start, size_total);
 538        return err;
 539}
 540
 541static struct platform_driver efifb_driver = {
 542        .driver = {
 543                .name   = "efifb",
 544        },
 545};
 546
 547static struct platform_device efifb_device = {
 548        .name   = "efifb",
 549};
 550
 551static 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}
 591module_init(efifb_init);
 592
 593MODULE_LICENSE("GPL");
 594
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