drivers/video/fbdev/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/kernel.h>
  10 #include <linux/efi.h>
  11 #include <linux/errno.h>
  12 #include <linux/fb.h>
  13 #include <linux/pci.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/screen_info.h>
  16 #include <video/vga.h>
  17 #include <asm/efi.h>
  18
  19 static bool request_mem_succeeded = false;
  20
  21 static struct fb_var_screeninfo efifb_defined = {
  22         .activate               = FB_ACTIVATE_NOW,
  23         .height                 = -1,
  24         .width                  = -1,
  25         .right_margin           = 32,
  26         .upper_margin           = 16,
  27         .lower_margin           = 4,
  28         .vsync_len              = 4,
  29         .vmode                  = FB_VMODE_NONINTERLACED,
  30 };
  31
  32 static struct fb_fix_screeninfo efifb_fix = {
  33         .id                     = "EFI VGA",
  34         .type                   = FB_TYPE_PACKED_PIXELS,
  35         .accel                  = FB_ACCEL_NONE,
  36         .visual                 = FB_VISUAL_TRUECOLOR,
  37 };
  38
  39 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
  40                            unsigned blue, unsigned transp,
  41                            struct fb_info *info)
  42 {
  43         /*
  44          *  Set a single color register. The values supplied are
  45          *  already rounded down to the hardware's capabilities
  46          *  (according to the entries in the `var' structure). Return
  47          *  != 0 for invalid regno.
  48          */
  49
  50         if (regno >= info->cmap.len)
  51                 return 1;
  52
  53         if (regno < 16) {
  54                 red   >>= 16 - info->var.red.length;
  55                 green >>= 16 - info->var.green.length;
  56                 blue  >>= 16 - info->var.blue.length;
  57                 ((u32 *)(info->pseudo_palette))[regno] =
  58                         (red   << info->var.red.offset)   |
  59                         (green << info->var.green.offset) |
  60                         (blue  << info->var.blue.offset);
  61         }
  62         return 0;
  63 }
  64
  65 static void efifb_destroy(struct fb_info *info)
  66 {
  67         if (info->screen_base)
  68                 iounmap(info->screen_base);
  69         if (request_mem_succeeded)
  70                 release_mem_region(info->apertures->ranges[0].base,
  71                                    info->apertures->ranges[0].size);
  72         fb_dealloc_cmap(&info->cmap);
  73 }
  74
  75 static struct fb_ops efifb_ops = {
  76         .owner          = THIS_MODULE,
  77         .fb_destroy     = efifb_destroy,
  78         .fb_setcolreg   = efifb_setcolreg,
  79         .fb_fillrect    = cfb_fillrect,
  80         .fb_copyarea    = cfb_copyarea,
  81         .fb_imageblit   = cfb_imageblit,
  82 };
  83
  84 static int efifb_setup(char *options)
  85 {
  86         char *this_opt;
  87
  88         if (options && *options) {
  89                 while ((this_opt = strsep(&options, ",")) != NULL) {
  90                         if (!*this_opt) continue;
  91
  92                         efifb_setup_from_dmi(&screen_info, this_opt);
  93
  94                         if (!strncmp(this_opt, "base:", 5))
  95                                 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
  96                         else if (!strncmp(this_opt, "stride:", 7))
  97                                 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
  98                         else if (!strncmp(this_opt, "height:", 7))
  99                                 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
 100                         else if (!strncmp(this_opt, "width:", 6))
 101                                 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
 102                 }
 103         }
 104
 105         return 0;
 106 }
 107
 108 static inline bool fb_base_is_valid(void)
 109 {
 110         if (screen_info.lfb_base)
 111                 return true;
 112
 113         if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
 114                 return false;
 115
 116         if (screen_info.ext_lfb_base)
 117                 return true;
 118
 119         return false;
 120 }
 121
 122 #define efifb_attr_decl(name, fmt)                                      \
 123 static ssize_t name##_show(struct device *dev,                          \
 124                            struct device_attribute *attr,               \
 125                            char *buf)                                   \
 126 {                                                                       \
 127         return sprintf(buf, fmt "\n", (screen_info.lfb_##name));        \
 128 }                                                                       \
 129 static DEVICE_ATTR_RO(name)
 130
 131 efifb_attr_decl(base, "0x%x");
 132 efifb_attr_decl(linelength, "%u");
 133 efifb_attr_decl(height, "%u");
 134 efifb_attr_decl(width, "%u");
 135 efifb_attr_decl(depth, "%u");
 136
 137 static struct attribute *efifb_attrs[] = {
 138         &dev_attr_base.attr,
 139         &dev_attr_linelength.attr,
 140         &dev_attr_width.attr,
 141         &dev_attr_height.attr,
 142         &dev_attr_depth.attr,
 143         NULL
 144 };
 145 ATTRIBUTE_GROUPS(efifb);
 146
 147 static bool pci_dev_disabled;   /* FB base matches BAR of a disabled device */
 148
 149 static int efifb_probe(struct platform_device *dev)
 150 {
 151         struct fb_info *info;
 152         int err;
 153         unsigned int size_vmode;
 154         unsigned int size_remap;
 155         unsigned int size_total;
 156         char *option = NULL;
 157
 158         if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
 159                 return -ENODEV;
 160
 161         if (fb_get_options("efifb", &option))
 162                 return -ENODEV;
 163         efifb_setup(option);
 164
 165         /* We don't get linelength from UGA Draw Protocol, only from
 166          * EFI Graphics Protocol.  So if it's not in DMI, and it's not
 167          * passed in from the user, we really can't use the framebuffer.
 168          */
 169         if (!screen_info.lfb_linelength)
 170                 return -ENODEV;
 171
 172         if (!screen_info.lfb_depth)
 173                 screen_info.lfb_depth = 32;
 174         if (!screen_info.pages)
 175                 screen_info.pages = 1;
 176         if (!fb_base_is_valid()) {
 177                 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
 178                 return -ENODEV;
 179         }
 180         printk(KERN_INFO "efifb: probing for efifb\n");
 181
 182         /* just assume they're all unset if any are */
 183         if (!screen_info.blue_size) {
 184                 screen_info.blue_size = 8;
 185                 screen_info.blue_pos = 0;
 186                 screen_info.green_size = 8;
 187                 screen_info.green_pos = 8;
 188                 screen_info.red_size = 8;
 189                 screen_info.red_pos = 16;
 190                 screen_info.rsvd_size = 8;
 191                 screen_info.rsvd_pos = 24;
 192         }
 193
 194         efifb_fix.smem_start = screen_info.lfb_base;
 195
 196         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
 197                 u64 ext_lfb_base;
 198
 199                 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
 200                 efifb_fix.smem_start |= ext_lfb_base;
 201         }
 202
 203         efifb_defined.bits_per_pixel = screen_info.lfb_depth;
 204         efifb_defined.xres = screen_info.lfb_width;
 205         efifb_defined.yres = screen_info.lfb_height;
 206         efifb_fix.line_length = screen_info.lfb_linelength;
 207
 208         /*   size_vmode -- that is the amount of memory needed for the
 209          *                 used video mode, i.e. the minimum amount of
 210          *                 memory we need. */
 211         size_vmode = efifb_defined.yres * efifb_fix.line_length;
 212
 213         /*   size_total -- all video memory we have. Used for
 214          *                 entries, ressource allocation and bounds
 215          *                 checking. */
 216         size_total = screen_info.lfb_size;
 217         if (size_total < size_vmode)
 218                 size_total = size_vmode;
 219
 220         /*   size_remap -- the amount of video memory we are going to
 221          *                 use for efifb.  With modern cards it is no
 222          *                 option to simply use size_total as that
 223          *                 wastes plenty of kernel address space. */
 224         size_remap  = size_vmode * 2;
 225         if (size_remap > size_total)
 226                 size_remap = size_total;
 227         if (size_remap % PAGE_SIZE)
 228                 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
 229         efifb_fix.smem_len = size_remap;
 230
 231         if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
 232                 request_mem_succeeded = true;
 233         } else {
 234                 /* We cannot make this fatal. Sometimes this comes from magic
 235                    spaces our resource handlers simply don't know about */
 236                 pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
 237                         efifb_fix.smem_start);
 238         }
 239
 240         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
 241         if (!info) {
 242                 pr_err("efifb: cannot allocate framebuffer\n");
 243                 err = -ENOMEM;
 244                 goto err_release_mem;
 245         }
 246         platform_set_drvdata(dev, info);
 247         info->pseudo_palette = info->par;
 248         info->par = NULL;
 249
 250         info->apertures = alloc_apertures(1);
 251         if (!info->apertures) {
 252                 err = -ENOMEM;
 253                 goto err_release_fb;
 254         }
 255         info->apertures->ranges[0].base = efifb_fix.smem_start;
 256         info->apertures->ranges[0].size = size_remap;
 257
 258         info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);
 259         if (!info->screen_base) {
 260                 pr_err("efifb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
 261                         efifb_fix.smem_len, efifb_fix.smem_start);
 262                 err = -EIO;
 263                 goto err_release_fb;
 264         }
 265
 266         pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
 267                efifb_fix.smem_start, size_remap/1024, size_total/1024);
 268         pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 269                efifb_defined.xres, efifb_defined.yres,
 270                efifb_defined.bits_per_pixel, efifb_fix.line_length,
 271                screen_info.pages);
 272
 273         efifb_defined.xres_virtual = efifb_defined.xres;
 274         efifb_defined.yres_virtual = efifb_fix.smem_len /
 275                                         efifb_fix.line_length;
 276         pr_info("efifb: scrolling: redraw\n");
 277         efifb_defined.yres_virtual = efifb_defined.yres;
 278
 279         /* some dummy values for timing to make fbset happy */
 280         efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
 281                                         1000 / efifb_defined.yres;
 282         efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
 283         efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;
 284
 285         efifb_defined.red.offset    = screen_info.red_pos;
 286         efifb_defined.red.length    = screen_info.red_size;
 287         efifb_defined.green.offset  = screen_info.green_pos;
 288         efifb_defined.green.length  = screen_info.green_size;
 289         efifb_defined.blue.offset   = screen_info.blue_pos;
 290         efifb_defined.blue.length   = screen_info.blue_size;
 291         efifb_defined.transp.offset = screen_info.rsvd_pos;
 292         efifb_defined.transp.length = screen_info.rsvd_size;
 293
 294         pr_info("efifb: %s: "
 295                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 296                "Truecolor",
 297                screen_info.rsvd_size,
 298                screen_info.red_size,
 299                screen_info.green_size,
 300                screen_info.blue_size,
 301                screen_info.rsvd_pos,
 302                screen_info.red_pos,
 303                screen_info.green_pos,
 304                screen_info.blue_pos);
 305
 306         efifb_fix.ypanstep  = 0;
 307         efifb_fix.ywrapstep = 0;
 308
 309         info->fbops = &efifb_ops;
 310         info->var = efifb_defined;
 311         info->fix = efifb_fix;
 312         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
 313
 314         err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
 315         if (err) {
 316                 pr_err("efifb: cannot add sysfs attrs\n");
 317                 goto err_unmap;
 318         }
 319         err = fb_alloc_cmap(&info->cmap, 256, 0);
 320         if (err < 0) {
 321                 pr_err("efifb: cannot allocate colormap\n");
 322                 goto err_groups;
 323         }
 324         err = register_framebuffer(info);
 325         if (err < 0) {
 326                 pr_err("efifb: cannot register framebuffer\n");
 327                 goto err_fb_dealoc;
 328         }
 329         fb_info(info, "%s frame buffer device\n", info->fix.id);
 330         return 0;
 331
 332 err_fb_dealoc:
 333         fb_dealloc_cmap(&info->cmap);
 334 err_groups:
 335         sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
 336 err_unmap:
 337         iounmap(info->screen_base);
 338 err_release_fb:
 339         framebuffer_release(info);
 340 err_release_mem:
 341         if (request_mem_succeeded)
 342                 release_mem_region(efifb_fix.smem_start, size_total);
 343         return err;
 344 }
 345
 346 static int efifb_remove(struct platform_device *pdev)
 347 {
 348         struct fb_info *info = platform_get_drvdata(pdev);
 349
 350         unregister_framebuffer(info);
 351         sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
 352         framebuffer_release(info);
 353
 354         return 0;
 355 }
 356
 357 static struct platform_driver efifb_driver = {
 358         .driver = {
 359                 .name = "efi-framebuffer",
 360         },
 361         .probe = efifb_probe,
 362         .remove = efifb_remove,
 363 };
 364
 365 builtin_platform_driver(efifb_driver);
 366
 367 #if defined(CONFIG_PCI) && !defined(CONFIG_X86)
 368
 369 static bool pci_bar_found;      /* did we find a BAR matching the efifb base? */
 370
 371 static void claim_efifb_bar(struct pci_dev *dev, int idx)
 372 {
 373         u16 word;
 374
 375         pci_bar_found = true;
 376
 377         pci_read_config_word(dev, PCI_COMMAND, &word);
 378         if (!(word & PCI_COMMAND_MEMORY)) {
 379                 pci_dev_disabled = true;
 380                 dev_err(&dev->dev,
 381                         "BAR %d: assigned to efifb but device is disabled!\n",
 382                         idx);
 383                 return;
 384         }
 385
 386         if (pci_claim_resource(dev, idx)) {
 387                 pci_dev_disabled = true;
 388                 dev_err(&dev->dev,
 389                         "BAR %d: failed to claim resource for efifb!\n", idx);
 390                 return;
 391         }
 392
 393         dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
 394 }
 395
 396 static void efifb_fixup_resources(struct pci_dev *dev)
 397 {
 398         u64 base = screen_info.lfb_base;
 399         u64 size = screen_info.lfb_size;
 400         int i;
 401
 402         if (pci_bar_found || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
 403                 return;
 404
 405         if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
 406                 base |= (u64)screen_info.ext_lfb_base << 32;
 407
 408         if (!base)
 409                 return;
 410
 411         for (i = 0; i <= PCI_STD_RESOURCE_END; i++) {
 412                 struct resource *res = &dev->resource[i];
 413
 414                 if (!(res->flags & IORESOURCE_MEM))
 415                         continue;
 416
 417                 if (res->start <= base && res->end >= base + size - 1) {
 418                         claim_efifb_bar(dev, i);
 419                         break;
 420                 }
 421         }
 422 }
 423 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
 424                                16, efifb_fixup_resources);
 425
 426 #endif