drivers/video/vesafb.c

   1 /*
   2  * framebuffer driver for VBE 2.0 compliant graphic boards
   3  *
   4  * switching to graphics mode happens at boot time (while
   5  * running in real mode, see arch/i386/boot/video.S).
   6  *
   7  * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
   8  *
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/string.h>
  15 #include <linux/mm.h>
  16 #include <linux/delay.h>
  17 #include <linux/fb.h>
  18 #include <linux/ioport.h>
  19 #include <linux/init.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/screen_info.h>
  22
  23 #include <video/vga.h>
  24 #include <asm/io.h>
  25 #include <asm/mtrr.h>
  26
  27 #define dac_reg (0x3c8)
  28 #define dac_val (0x3c9)
  29
  30 /* --------------------------------------------------------------------- */
  31
  32 static struct fb_var_screeninfo vesafb_defined = {
  33         .activate       = FB_ACTIVATE_NOW,
  34         .height         = -1,
  35         .width          = -1,
  36         .right_margin   = 32,
  37         .upper_margin   = 16,
  38         .lower_margin   = 4,
  39         .vsync_len      = 4,
  40         .vmode          = FB_VMODE_NONINTERLACED,
  41 };
  42
  43 static struct fb_fix_screeninfo vesafb_fix = {
  44         .id     = "VESA VGA",
  45         .type   = FB_TYPE_PACKED_PIXELS,
  46         .accel  = FB_ACCEL_NONE,
  47 };
  48
  49 static int   inverse    __read_mostly;
  50 static int   mtrr       __read_mostly;          /* disable mtrr */
  51 static int   vram_remap;                        /* Set amount of memory to be used */
  52 static int   vram_total;                        /* Set total amount of memory */
  53 static int   pmi_setpal __read_mostly = 1;      /* pmi for palette changes ??? */
  54 static int   ypan       __read_mostly;          /* 0..nothing, 1..ypan, 2..ywrap */
  55 static void  (*pmi_start)(void) __read_mostly;
  56 static void  (*pmi_pal)  (void) __read_mostly;
  57 static int   depth      __read_mostly;
  58 static int   vga_compat __read_mostly;
  59 /* --------------------------------------------------------------------- */
  60
  61 static int vesafb_pan_display(struct fb_var_screeninfo *var,
  62                               struct fb_info *info)
  63 {
  64 #ifdef __i386__
  65         int offset;
  66
  67         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
  68
  69         __asm__ __volatile__(
  70                 "call *(%%edi)"
  71                 : /* no return value */
  72                 : "a" (0x4f07),         /* EAX */
  73                   "b" (0),              /* EBX */
  74                   "c" (offset),         /* ECX */
  75                   "d" (offset >> 16),   /* EDX */
  76                   "D" (&pmi_start));    /* EDI */
  77 #endif
  78         return 0;
  79 }
  80
  81 static int vesa_setpalette(int regno, unsigned red, unsigned green,
  82                             unsigned blue)
  83 {
  84         int shift = 16 - depth;
  85         int err = -EINVAL;
  86
  87 /*
  88  * Try VGA registers first...
  89  */
  90         if (vga_compat) {
  91                 outb_p(regno,       dac_reg);
  92                 outb_p(red   >> shift, dac_val);
  93                 outb_p(green >> shift, dac_val);
  94                 outb_p(blue  >> shift, dac_val);
  95                 err = 0;
  96         }
  97
  98 #ifdef __i386__
  99 /*
 100  * Fallback to the PMI....
 101  */
 102         if (err && pmi_setpal) {
 103                 struct { u_char blue, green, red, pad; } entry;
 104
 105                 entry.red   = red   >> shift;
 106                 entry.green = green >> shift;
 107                 entry.blue  = blue  >> shift;
 108                 entry.pad   = 0;
 109                 __asm__ __volatile__(
 110                 "call *(%%esi)"
 111                 : /* no return value */
 112                 : "a" (0x4f09),         /* EAX */
 113                   "b" (0),              /* EBX */
 114                   "c" (1),              /* ECX */
 115                   "d" (regno),          /* EDX */
 116                   "D" (&entry),         /* EDI */
 117                   "S" (&pmi_pal));      /* ESI */
 118                 err = 0;
 119         }
 120 #endif
 121
 122         return err;
 123 }
 124
 125 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 126                             unsigned blue, unsigned transp,
 127                             struct fb_info *info)
 128 {
 129         int err = 0;
 130
 131         /*
 132          *  Set a single color register. The values supplied are
 133          *  already rounded down to the hardware's capabilities
 134          *  (according to the entries in the `var' structure). Return
 135          *  != 0 for invalid regno.
 136          */
 137
 138         if (regno >= info->cmap.len)
 139                 return 1;
 140
 141         if (info->var.bits_per_pixel == 8)
 142                 err = vesa_setpalette(regno,red,green,blue);
 143         else if (regno < 16) {
 144                 switch (info->var.bits_per_pixel) {
 145                 case 16:
 146                         if (info->var.red.offset == 10) {
 147                                 /* 1:5:5:5 */
 148                                 ((u32*) (info->pseudo_palette))[regno] =
 149                                         ((red   & 0xf800) >>  1) |
 150                                         ((green & 0xf800) >>  6) |
 151                                         ((blue  & 0xf800) >> 11);
 152                         } else {
 153                                 /* 0:5:6:5 */
 154                                 ((u32*) (info->pseudo_palette))[regno] =
 155                                         ((red   & 0xf800)      ) |
 156                                         ((green & 0xfc00) >>  5) |
 157                                         ((blue  & 0xf800) >> 11);
 158                         }
 159                         break;
 160                 case 24:
 161                 case 32:
 162                         red   >>= 8;
 163                         green >>= 8;
 164                         blue  >>= 8;
 165                         ((u32 *)(info->pseudo_palette))[regno] =
 166                                 (red   << info->var.red.offset)   |
 167                                 (green << info->var.green.offset) |
 168                                 (blue  << info->var.blue.offset);
 169                         break;
 170                 }
 171         }
 172
 173         return err;
 174 }
 175
 176 static void vesafb_destroy(struct fb_info *info)
 177 {
 178         fb_dealloc_cmap(&info->cmap);
 179         if (info->screen_base)
 180                 iounmap(info->screen_base);
 181         release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
 182         framebuffer_release(info);
 183 }
 184
 185 static struct fb_ops vesafb_ops = {
 186         .owner          = THIS_MODULE,
 187         .fb_destroy     = vesafb_destroy,
 188         .fb_setcolreg   = vesafb_setcolreg,
 189         .fb_pan_display = vesafb_pan_display,
 190         .fb_fillrect    = cfb_fillrect,
 191         .fb_copyarea    = cfb_copyarea,
 192         .fb_imageblit   = cfb_imageblit,
 193 };
 194
 195 static int vesafb_setup(char *options)
 196 {
 197         char *this_opt;
 198
 199         if (!options || !*options)
 200                 return 0;
 201
 202         while ((this_opt = strsep(&options, ",")) != NULL) {
 203                 if (!*this_opt) continue;
 204
 205                 if (! strcmp(this_opt, "inverse"))
 206                         inverse=1;
 207                 else if (! strcmp(this_opt, "redraw"))
 208                         ypan=0;
 209                 else if (! strcmp(this_opt, "ypan"))
 210                         ypan=1;
 211                 else if (! strcmp(this_opt, "ywrap"))
 212                         ypan=2;
 213                 else if (! strcmp(this_opt, "vgapal"))
 214                         pmi_setpal=0;
 215                 else if (! strcmp(this_opt, "pmipal"))
 216                         pmi_setpal=1;
 217                 else if (! strncmp(this_opt, "mtrr:", 5))
 218                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
 219                 else if (! strcmp(this_opt, "nomtrr"))
 220                         mtrr=0;
 221                 else if (! strncmp(this_opt, "vtotal:", 7))
 222                         vram_total = simple_strtoul(this_opt+7, NULL, 0);
 223                 else if (! strncmp(this_opt, "vremap:", 7))
 224                         vram_remap = simple_strtoul(this_opt+7, NULL, 0);
 225         }
 226         return 0;
 227 }
 228
 229 static int vesafb_probe(struct platform_device *dev)
 230 {
 231         struct fb_info *info;
 232         int i, err;
 233         unsigned int size_vmode;
 234         unsigned int size_remap;
 235         unsigned int size_total;
 236         char *option = NULL;
 237
 238         /* ignore error return of fb_get_options */
 239         fb_get_options("vesafb", &option);
 240         vesafb_setup(option);
 241
 242         if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
 243                 return -ENODEV;
 244
 245         vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
 246         vesafb_fix.smem_start = screen_info.lfb_base;
 247         vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
 248         if (15 == vesafb_defined.bits_per_pixel)
 249                 vesafb_defined.bits_per_pixel = 16;
 250         vesafb_defined.xres = screen_info.lfb_width;
 251         vesafb_defined.yres = screen_info.lfb_height;
 252         vesafb_fix.line_length = screen_info.lfb_linelength;
 253         vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
 254                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
 255
 256         /*   size_vmode -- that is the amount of memory needed for the
 257          *                 used video mode, i.e. the minimum amount of
 258          *                 memory we need. */
 259         size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
 260
 261         /*   size_total -- all video memory we have. Used for mtrr
 262          *                 entries, resource allocation and bounds
 263          *                 checking. */
 264         size_total = screen_info.lfb_size * 65536;
 265         if (vram_total)
 266                 size_total = vram_total * 1024 * 1024;
 267         if (size_total < size_vmode)
 268                 size_total = size_vmode;
 269
 270         /*   size_remap -- the amount of video memory we are going to
 271          *                 use for vesafb.  With modern cards it is no
 272          *                 option to simply use size_total as that
 273          *                 wastes plenty of kernel address space. */
 274         size_remap  = size_vmode * 2;
 275         if (vram_remap)
 276                 size_remap = vram_remap * 1024 * 1024;
 277         if (size_remap < size_vmode)
 278                 size_remap = size_vmode;
 279         if (size_remap > size_total)
 280                 size_remap = size_total;
 281         vesafb_fix.smem_len = size_remap;
 282
 283 #ifndef __i386__
 284         screen_info.vesapm_seg = 0;
 285 #endif
 286
 287         if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
 288                 printk(KERN_WARNING
 289                        "vesafb: cannot reserve video memory at 0x%lx\n",
 290                         vesafb_fix.smem_start);
 291                 /* We cannot make this fatal. Sometimes this comes from magic
 292                    spaces our resource handlers simply don't know about */
 293         }
 294
 295         info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
 296         if (!info) {
 297                 release_mem_region(vesafb_fix.smem_start, size_total);
 298                 return -ENOMEM;
 299         }
 300         info->pseudo_palette = info->par;
 301         info->par = NULL;
 302
 303         /* set vesafb aperture size for generic probing */
 304         info->apertures = alloc_apertures(1);
 305         if (!info->apertures) {
 306                 err = -ENOMEM;
 307                 goto err;
 308         }
 309         info->apertures->ranges[0].base = screen_info.lfb_base;
 310         info->apertures->ranges[0].size = size_total;
 311
 312         printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 313                vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
 314
 315         if (screen_info.vesapm_seg) {
 316                 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
 317                        screen_info.vesapm_seg,screen_info.vesapm_off);
 318         }
 319
 320         if (screen_info.vesapm_seg < 0xc000)
 321                 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
 322
 323         if (ypan || pmi_setpal) {
 324                 unsigned short *pmi_base;
 325                 pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
 326                 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
 327                 pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
 328                 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
 329                 if (pmi_base[3]) {
 330                         printk(KERN_INFO "vesafb: pmi: ports = ");
 331                                 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
 332                                         printk("%x ",pmi_base[i]);
 333                         printk("\n");
 334                         if (pmi_base[i] != 0xffff) {
 335                                 /*
 336                                  * memory areas not supported (yet?)
 337                                  *
 338                                  * Rules are: we have to set up a descriptor for the requested
 339                                  * memory area and pass it in the ES register to the BIOS function.
 340                                  */
 341                                 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
 342                                 ypan = pmi_setpal = 0;
 343                         }
 344                 }
 345         }
 346
 347         if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
 348                 printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
 349                                     "        colors may be incorrect\n");
 350                 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 351         }
 352
 353         vesafb_defined.xres_virtual = vesafb_defined.xres;
 354         vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
 355         if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
 356                 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
 357                        (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
 358         } else {
 359                 printk(KERN_INFO "vesafb: scrolling: redraw\n");
 360                 vesafb_defined.yres_virtual = vesafb_defined.yres;
 361                 ypan = 0;
 362         }
 363
 364         /* some dummy values for timing to make fbset happy */
 365         vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
 366         vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
 367         vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
 368
 369         vesafb_defined.red.offset    = screen_info.red_pos;
 370         vesafb_defined.red.length    = screen_info.red_size;
 371         vesafb_defined.green.offset  = screen_info.green_pos;
 372         vesafb_defined.green.length  = screen_info.green_size;
 373         vesafb_defined.blue.offset   = screen_info.blue_pos;
 374         vesafb_defined.blue.length   = screen_info.blue_size;
 375         vesafb_defined.transp.offset = screen_info.rsvd_pos;
 376         vesafb_defined.transp.length = screen_info.rsvd_size;
 377
 378         if (vesafb_defined.bits_per_pixel <= 8) {
 379                 depth = vesafb_defined.green.length;
 380                 vesafb_defined.red.length =
 381                 vesafb_defined.green.length =
 382                 vesafb_defined.blue.length =
 383                 vesafb_defined.bits_per_pixel;
 384         }
 385
 386         printk(KERN_INFO "vesafb: %s: "
 387                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 388                (vesafb_defined.bits_per_pixel > 8) ?
 389                "Truecolor" : (vga_compat || pmi_setpal) ?
 390                "Pseudocolor" : "Static Pseudocolor",
 391                screen_info.rsvd_size,
 392                screen_info.red_size,
 393                screen_info.green_size,
 394                screen_info.blue_size,
 395                screen_info.rsvd_pos,
 396                screen_info.red_pos,
 397                screen_info.green_pos,
 398                screen_info.blue_pos);
 399
 400         vesafb_fix.ypanstep  = ypan     ? 1 : 0;
 401         vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
 402
 403         /* request failure does not faze us, as vgacon probably has this
 404          * region already (FIXME) */
 405         request_region(0x3c0, 32, "vesafb");
 406
 407 #ifdef CONFIG_MTRR
 408         if (mtrr) {
 409                 unsigned int temp_size = size_total;
 410                 unsigned int type = 0;
 411
 412                 switch (mtrr) {
 413                 case 1:
 414                         type = MTRR_TYPE_UNCACHABLE;
 415                         break;
 416                 case 2:
 417                         type = MTRR_TYPE_WRBACK;
 418                         break;
 419                 case 3:
 420                         type = MTRR_TYPE_WRCOMB;
 421                         break;
 422                 case 4:
 423                         type = MTRR_TYPE_WRTHROUGH;
 424                         break;
 425                 default:
 426                         type = 0;
 427                         break;
 428                 }
 429
 430                 if (type) {
 431                         int rc;
 432
 433                         /* Find the largest power-of-two */
 434                         temp_size = roundup_pow_of_two(temp_size);
 435
 436                         /* Try and find a power of two to add */
 437                         do {
 438                                 rc = mtrr_add(vesafb_fix.smem_start, temp_size,
 439                                               type, 1);
 440                                 temp_size >>= 1;
 441                         } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
 442                 }
 443         }
 444 #endif
 445
 446         switch (mtrr) {
 447         case 1: /* uncachable */
 448                 info->screen_base = ioremap_nocache(vesafb_fix.smem_start, vesafb_fix.smem_len);
 449                 break;
 450         case 2: /* write-back */
 451                 info->screen_base = ioremap_cache(vesafb_fix.smem_start, vesafb_fix.smem_len);
 452                 break;
 453         case 3: /* write-combining */
 454                 info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
 455                 break;
 456         case 4: /* write-through */
 457         default:
 458                 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
 459                 break;
 460         }
 461         if (!info->screen_base) {
 462                 printk(KERN_ERR
 463                        "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
 464                         vesafb_fix.smem_len, vesafb_fix.smem_start);
 465                 err = -EIO;
 466                 goto err;
 467         }
 468
 469         printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
 470                "using %dk, total %dk\n",
 471                vesafb_fix.smem_start, info->screen_base,
 472                size_remap/1024, size_total/1024);
 473
 474         info->fbops = &vesafb_ops;
 475         info->var = vesafb_defined;
 476         info->fix = vesafb_fix;
 477         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
 478                 (ypan ? FBINFO_HWACCEL_YPAN : 0);
 479
 480         if (!ypan)
 481                 info->fbops->fb_pan_display = NULL;
 482
 483         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 484                 err = -ENOMEM;
 485                 goto err;
 486         }
 487         if (register_framebuffer(info)<0) {
 488                 err = -EINVAL;
 489                 fb_dealloc_cmap(&info->cmap);
 490                 goto err;
 491         }
 492         fb_info(info, "%s frame buffer device\n", info->fix.id);
 493         return 0;
 494 err:
 495         if (info->screen_base)
 496                 iounmap(info->screen_base);
 497         framebuffer_release(info);
 498         release_mem_region(vesafb_fix.smem_start, size_total);
 499         return err;
 500 }
 501
 502 static struct platform_driver vesafb_driver = {
 503         .driver = {
 504                 .name = "vesa-framebuffer",
 505                 .owner = THIS_MODULE,
 506         },
 507         .probe = vesafb_probe,
 508 };
 509
 510 module_platform_driver(vesafb_driver);
 511 MODULE_LICENSE("GPL");