LXR linux/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
  17#include <video/vga.h>
  18
  19static struct fb_var_screeninfo efifb_defined __initdata = {
  20        .activate               = FB_ACTIVATE_NOW,
  21        .height                 = -1,
  22        .width                  = -1,
  23        .right_margin           = 32,
  24        .upper_margin           = 16,
  25        .lower_margin           = 4,
  26        .vsync_len              = 4,
  27        .vmode                  = FB_VMODE_NONINTERLACED,
  28};
  29
  30static struct fb_fix_screeninfo efifb_fix __initdata = {
  31        .id                     = "EFI VGA",
  32        .type                   = FB_TYPE_PACKED_PIXELS,
  33        .accel                  = FB_ACCEL_NONE,
  34        .visual                 = FB_VISUAL_TRUECOLOR,
  35};
  36
  37enum {
  38        M_I17,          /* 17-Inch iMac */
  39        M_I20,          /* 20-Inch iMac */
  40        M_I20_SR,       /* 20-Inch iMac (Santa Rosa) */
  41        M_I24,          /* 24-Inch iMac */
  42        M_MINI,         /* Mac Mini */
  43        M_MB,           /* MacBook */
  44        M_MB_2,         /* MacBook, 2nd rev. */
  45        M_MB_3,         /* MacBook, 3rd rev. */
  46        M_MB_SR,        /* MacBook, 2nd gen, (Santa Rosa) */
  47        M_MBA,          /* MacBook Air */
  48        M_MBP,          /* MacBook Pro */
  49        M_MBP_2,        /* MacBook Pro 2nd gen */
  50        M_MBP_SR,       /* MacBook Pro (Santa Rosa) */
  51        M_MBP_4,        /* MacBook Pro, 4th gen */
  52        M_UNKNOWN       /* placeholder */
  53};
  54
  55static struct efifb_dmi_info {
  56        char *optname;
  57        unsigned long base;
  58        int stride;
  59        int width;
  60        int height;
  61} dmi_list[] = {
  62        [M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900 },
  63        [M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050 }, /* guess */
  64        [M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050 },
  65        [M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200 }, /* guess */
  66        [M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768 },
  67        [M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800 },
  68        [M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800 },
  69        [M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900 },
  70        [M_MBP_2] = { "mbp2", 0, 0, 0, 0 }, /* placeholder */
  71        [M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900 },
  72        [M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200 },
  73        [M_UNKNOWN] = { NULL, 0, 0, 0, 0 }
  74};
  75
  76static int set_system(const struct dmi_system_id *id);
  77
  78#define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid)               \
  79        { set_system, name, {                                   \
  80                DMI_MATCH(DMI_BIOS_VENDOR, vendor),             \
  81                DMI_MATCH(DMI_PRODUCT_NAME, name) },            \
  82          &dmi_list[enumid] }
  83
  84static struct dmi_system_id __initdata dmi_system_table[] = {
  85        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac4,1", M_I17),
  86        /* At least one of these two will be right; maybe both? */
  87        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac5,1", M_I20),
  88        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac5,1", M_I20),
  89        /* At least one of these two will be right; maybe both? */
  90        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac6,1", M_I24),
  91        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac6,1", M_I24),
  92        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac7,1", M_I20_SR),
  93        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),
  94        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook1,1", M_MB),
  95        /* At least one of these two will be right; maybe both? */
  96        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook2,1", M_MB),
  97        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook2,1", M_MB),
  98        /* At least one of these two will be right; maybe both? */
  99        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook3,1", M_MB),
 100        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook3,1", M_MB),
 101        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook4,1", M_MB),
 102        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),
 103        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro1,1", M_MBP),
 104        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,1", M_MBP_2),
 105        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro2,1", M_MBP_2),
 106        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro3,1", M_MBP_SR),
 107        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro3,1", M_MBP_SR),
 108        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro4,1", M_MBP_4),
 109        {},
 110};
 111
 112static int set_system(const struct dmi_system_id *id)
 113{
 114        struct efifb_dmi_info *info = id->driver_data;
 115        if (info->base == 0)
 116                return -ENODEV;
 117
 118        printk(KERN_INFO "efifb: dmi detected %s - framebuffer at %p "
 119                         "(%dx%d, stride %d)\n", id->ident,
 120                         (void *)info->base, info->width, info->height,
 121                         info->stride);
 122
 123        /* Trust the bootloader over the DMI tables */
 124        if (screen_info.lfb_base == 0)
 125                screen_info.lfb_base = info->base;
 126        if (screen_info.lfb_linelength == 0)
 127                screen_info.lfb_linelength = info->stride;
 128        if (screen_info.lfb_width == 0)
 129                screen_info.lfb_width = info->width;
 130        if (screen_info.lfb_height == 0)
 131                screen_info.lfb_height = info->height;
 132        if (screen_info.orig_video_isVGA == 0)
 133                screen_info.orig_video_isVGA = VIDEO_TYPE_EFI;
 134
 135        return 0;
 136}
 137
 138static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
 139                           unsigned blue, unsigned transp,
 140                           struct fb_info *info)
 141{
 142        /*
 143         *  Set a single color register. The values supplied are
 144         *  already rounded down to the hardware's capabilities
 145         *  (according to the entries in the `var' structure). Return
 146         *  != 0 for invalid regno.
 147         */
 148
 149        if (regno >= info->cmap.len)
 150                return 1;
 151
 152        if (regno < 16) {
 153                red   >>= 8;
 154                green >>= 8;
 155                blue  >>= 8;
 156                ((u32 *)(info->pseudo_palette))[regno] =
 157                        (red   << info->var.red.offset)   |
 158                        (green << info->var.green.offset) |
 159                        (blue  << info->var.blue.offset);
 160        }
 161        return 0;
 162}
 163
 164static struct fb_ops efifb_ops = {
 165        .owner          = THIS_MODULE,
 166        .fb_setcolreg   = efifb_setcolreg,
 167        .fb_fillrect    = cfb_fillrect,
 168        .fb_copyarea    = cfb_copyarea,
 169        .fb_imageblit   = cfb_imageblit,
 170};
 171
 172static int __init efifb_setup(char *options)
 173{
 174        char *this_opt;
 175        int i;
 176
 177        if (!options || !*options)
 178                return 0;
 179
 180        while ((this_opt = strsep(&options, ",")) != NULL) {
 181                if (!*this_opt) continue;
 182
 183                for (i = 0; i < M_UNKNOWN; i++) {
 184                        if (!strcmp(this_opt, dmi_list[i].optname) &&
 185                                        dmi_list[i].base != 0) {
 186                                screen_info.lfb_base = dmi_list[i].base;
 187                                screen_info.lfb_linelength = dmi_list[i].stride;
 188                                screen_info.lfb_width = dmi_list[i].width;
 189                                screen_info.lfb_height = dmi_list[i].height;
 190                        }
 191                }
 192                if (!strncmp(this_opt, "base:", 5))
 193                        screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
 194                else if (!strncmp(this_opt, "stride:", 7))
 195                        screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
 196                else if (!strncmp(this_opt, "height:", 7))
 197                        screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
 198                else if (!strncmp(this_opt, "width:", 6))
 199                        screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
 200        }
 201        return 0;
 202}
 203
 204static int __init efifb_probe(struct platform_device *dev)
 205{
 206        struct fb_info *info;
 207        int err;
 208        unsigned int size_vmode;
 209        unsigned int size_remap;
 210        unsigned int size_total;
 211        int request_succeeded = 0;
 212
 213        if (!screen_info.lfb_depth)
 214                screen_info.lfb_depth = 32;
 215        if (!screen_info.pages)
 216                screen_info.pages = 1;
 217        if (!screen_info.lfb_base) {
 218                printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
 219                return -ENODEV;
 220        }
 221        printk(KERN_INFO "efifb: probing for efifb\n");
 222
 223        /* just assume they're all unset if any are */
 224        if (!screen_info.blue_size) {
 225                screen_info.blue_size = 8;
 226                screen_info.blue_pos = 0;
 227                screen_info.green_size = 8;
 228                screen_info.green_pos = 8;
 229                screen_info.red_size = 8;
 230                screen_info.red_pos = 16;
 231                screen_info.rsvd_size = 8;
 232                screen_info.rsvd_pos = 24;
 233        }
 234
 235        efifb_fix.smem_start = screen_info.lfb_base;
 236        efifb_defined.bits_per_pixel = screen_info.lfb_depth;
 237        efifb_defined.xres = screen_info.lfb_width;
 238        efifb_defined.yres = screen_info.lfb_height;
 239        efifb_fix.line_length = screen_info.lfb_linelength;
 240
 241        /*   size_vmode -- that is the amount of memory needed for the
 242         *                 used video mode, i.e. the minimum amount of
 243         *                 memory we need. */
 244        size_vmode = efifb_defined.yres * efifb_fix.line_length;
 245
 246        /*   size_total -- all video memory we have. Used for
 247         *                 entries, ressource allocation and bounds
 248         *                 checking. */
 249        size_total = screen_info.lfb_size;
 250        if (size_total < size_vmode)
 251                size_total = size_vmode;
 252
 253        /*   size_remap -- the amount of video memory we are going to
 254         *                 use for efifb.  With modern cards it is no
 255         *                 option to simply use size_total as that
 256         *                 wastes plenty of kernel address space. */
 257        size_remap  = size_vmode * 2;
 258        if (size_remap > size_total)
 259                size_remap = size_total;
 260        if (size_remap % PAGE_SIZE)
 261                size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
 262        efifb_fix.smem_len = size_remap;
 263
 264        if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
 265                request_succeeded = 1;
 266        } else {
 267                /* We cannot make this fatal. Sometimes this comes from magic
 268                   spaces our resource handlers simply don't know about */
 269                printk(KERN_WARNING
 270                       "efifb: cannot reserve video memory at 0x%lx\n",
 271                        efifb_fix.smem_start);
 272        }
 273
 274        info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 275        if (!info) {
 276                printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
 277                err = -ENOMEM;
 278                goto err_release_mem;
 279        }
 280        info->pseudo_palette = info->par;
 281        info->par = NULL;
 282
 283        info->aperture_base = efifb_fix.smem_start;
 284        info->aperture_size = size_total;
 285
 286        info->screen_base = ioremap(efifb_fix.smem_start, efifb_fix.smem_len);
 287        if (!info->screen_base) {
 288                printk(KERN_ERR "efifb: abort, cannot ioremap video memory "
 289                                "0x%x @ 0x%lx\n",
 290                        efifb_fix.smem_len, efifb_fix.smem_start);
 291                err = -EIO;
 292                goto err_release_fb;
 293        }
 294
 295        printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "
 296               "using %dk, total %dk\n",
 297               efifb_fix.smem_start, info->screen_base,
 298               size_remap/1024, size_total/1024);
 299        printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 300               efifb_defined.xres, efifb_defined.yres,
 301               efifb_defined.bits_per_pixel, efifb_fix.line_length,
 302               screen_info.pages);
 303
 304        efifb_defined.xres_virtual = efifb_defined.xres;
 305        efifb_defined.yres_virtual = efifb_fix.smem_len /
 306                                        efifb_fix.line_length;
 307        printk(KERN_INFO "efifb: scrolling: redraw\n");
 308        efifb_defined.yres_virtual = efifb_defined.yres;
 309
 310        /* some dummy values for timing to make fbset happy */
 311        efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
 312                                        1000 / efifb_defined.yres;
 313        efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
 314        efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;
 315
 316        efifb_defined.red.offset    = screen_info.red_pos;
 317        efifb_defined.red.length    = screen_info.red_size;
 318        efifb_defined.green.offset  = screen_info.green_pos;
 319        efifb_defined.green.length  = screen_info.green_size;
 320        efifb_defined.blue.offset   = screen_info.blue_pos;
 321        efifb_defined.blue.length   = screen_info.blue_size;
 322        efifb_defined.transp.offset = screen_info.rsvd_pos;
 323        efifb_defined.transp.length = screen_info.rsvd_size;
 324
 325        printk(KERN_INFO "efifb: %s: "
 326               "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 327               "Truecolor",
 328               screen_info.rsvd_size,
 329               screen_info.red_size,
 330               screen_info.green_size,
 331               screen_info.blue_size,
 332               screen_info.rsvd_pos,
 333               screen_info.red_pos,
 334               screen_info.green_pos,
 335               screen_info.blue_pos);
 336
 337        efifb_fix.ypanstep  = 0;
 338        efifb_fix.ywrapstep = 0;
 339
 340        info->fbops = &efifb_ops;
 341        info->var = efifb_defined;
 342        info->fix = efifb_fix;
 343        info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
 344
 345        if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
 346                printk(KERN_ERR "efifb: cannot allocate colormap\n");
 347                goto err_unmap;
 348        }
 349        if ((err = register_framebuffer(info)) < 0) {
 350                printk(KERN_ERR "efifb: cannot register framebuffer\n");
 351                goto err_fb_dealoc;
 352        }
 353        printk(KERN_INFO "fb%d: %s frame buffer device\n",
 354                info->node, info->fix.id);
 355        return 0;
 356
 357err_fb_dealoc:
 358        fb_dealloc_cmap(&info->cmap);
 359err_unmap:
 360        iounmap(info->screen_base);
 361err_release_fb:
 362        framebuffer_release(info);
 363err_release_mem:
 364        if (request_succeeded)
 365                release_mem_region(efifb_fix.smem_start, size_total);
 366        return err;
 367}
 368
 369static struct platform_driver efifb_driver = {
 370        .probe  = efifb_probe,
 371        .driver = {
 372                .name   = "efifb",
 373        },
 374};
 375
 376static struct platform_device efifb_device = {
 377        .name   = "efifb",
 378};
 379
 380static int __init efifb_init(void)
 381{
 382        int ret;
 383        char *option = NULL;
 384
 385        dmi_check_system(dmi_system_table);
 386
 387        if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
 388                return -ENODEV;
 389
 390        if (fb_get_options("efifb", &option))
 391                return -ENODEV;
 392        efifb_setup(option);
 393
 394        /* We don't get linelength from UGA Draw Protocol, only from
 395         * EFI Graphics Protocol.  So if it's not in DMI, and it's not
 396         * passed in from the user, we really can't use the framebuffer.
 397         */
 398        if (!screen_info.lfb_linelength)
 399                return -ENODEV;
 400
 401        ret = platform_driver_register(&efifb_driver);
 402
 403        if (!ret) {
 404                ret = platform_device_register(&efifb_device);
 405                if (ret)
 406                        platform_driver_unregister(&efifb_driver);
 407        }
 408        return ret;
 409}
 410module_init(efifb_init);
 411
 412MODULE_LICENSE("GPL");
 413