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/slab.h>
  17 #include <linux/delay.h>
  18 #include <linux/fb.h>
  19 #include <linux/ioport.h>
  20 #include <linux/init.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/screen_info.h>
  23
  24 #include <video/vga.h>
  25 #include <asm/io.h>
  26 #include <asm/mtrr.h>
  27
  28 #define dac_reg (0x3c8)
  29 #define dac_val (0x3c9)
  30
  31 /* --------------------------------------------------------------------- */
  32
  33 static struct fb_var_screeninfo vesafb_defined __initdata = {
  34         .activate       = FB_ACTIVATE_NOW,
  35         .height         = -1,
  36         .width          = -1,
  37         .right_margin   = 32,
  38         .upper_margin   = 16,
  39         .lower_margin   = 4,
  40         .vsync_len      = 4,
  41         .vmode          = FB_VMODE_NONINTERLACED,
  42 };
  43
  44 static struct fb_fix_screeninfo vesafb_fix __initdata = {
  45         .id     = "VESA VGA",
  46         .type   = FB_TYPE_PACKED_PIXELS,
  47         .accel  = FB_ACCEL_NONE,
  48 };
  49
  50 static int   inverse    __read_mostly;
  51 static int   mtrr       __read_mostly;          /* disable mtrr */
  52 static int   vram_remap __initdata;             /* Set amount of memory to be used */
  53 static int   vram_total __initdata;             /* Set total amount of memory */
  54 static int   pmi_setpal __read_mostly = 1;      /* pmi for palette changes ??? */
  55 static int   ypan       __read_mostly;          /* 0..nothing, 1..ypan, 2..ywrap */
  56 static void  (*pmi_start)(void) __read_mostly;
  57 static void  (*pmi_pal)  (void) __read_mostly;
  58 static int   depth      __read_mostly;
  59 static int   vga_compat __read_mostly;
  60 /* --------------------------------------------------------------------- */
  61
  62 static int vesafb_pan_display(struct fb_var_screeninfo *var,
  63                               struct fb_info *info)
  64 {
  65 #ifdef __i386__
  66         int offset;
  67
  68         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
  69
  70         __asm__ __volatile__(
  71                 "call *(%%edi)"
  72                 : /* no return value */
  73                 : "a" (0x4f07),         /* EAX */
  74                   "b" (0),              /* EBX */
  75                   "c" (offset),         /* ECX */
  76                   "d" (offset >> 16),   /* EDX */
  77                   "D" (&pmi_start));    /* EDI */
  78 #endif
  79         return 0;
  80 }
  81
  82 static int vesa_setpalette(int regno, unsigned red, unsigned green,
  83                             unsigned blue)
  84 {
  85         int shift = 16 - depth;
  86         int err = -EINVAL;
  87
  88 /*
  89  * Try VGA registers first...
  90  */
  91         if (vga_compat) {
  92                 outb_p(regno,       dac_reg);
  93                 outb_p(red   >> shift, dac_val);
  94                 outb_p(green >> shift, dac_val);
  95                 outb_p(blue  >> shift, dac_val);
  96                 err = 0;
  97         }
  98
  99 #ifdef __i386__
 100 /*
 101  * Fallback to the PMI....
 102  */
 103         if (err && pmi_setpal) {
 104                 struct { u_char blue, green, red, pad; } entry;
 105
 106                 entry.red   = red   >> shift;
 107                 entry.green = green >> shift;
 108                 entry.blue  = blue  >> shift;
 109                 entry.pad   = 0;
 110                 __asm__ __volatile__(
 111                 "call *(%%esi)"
 112                 : /* no return value */
 113                 : "a" (0x4f09),         /* EAX */
 114                   "b" (0),              /* EBX */
 115                   "c" (1),              /* ECX */
 116                   "d" (regno),          /* EDX */
 117                   "D" (&entry),         /* EDI */
 118                   "S" (&pmi_pal));      /* ESI */
 119                 err = 0;
 120         }
 121 #endif
 122
 123         return err;
 124 }
 125
 126 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 127                             unsigned blue, unsigned transp,
 128                             struct fb_info *info)
 129 {
 130         int err = 0;
 131
 132         /*
 133          *  Set a single color register. The values supplied are
 134          *  already rounded down to the hardware's capabilities
 135          *  (according to the entries in the `var' structure). Return
 136          *  != 0 for invalid regno.
 137          */
 138
 139         if (regno >= info->cmap.len)
 140                 return 1;
 141
 142         if (info->var.bits_per_pixel == 8)
 143                 err = vesa_setpalette(regno,red,green,blue);
 144         else if (regno < 16) {
 145                 switch (info->var.bits_per_pixel) {
 146                 case 16:
 147                         if (info->var.red.offset == 10) {
 148                                 /* 1:5:5:5 */
 149                                 ((u32*) (info->pseudo_palette))[regno] =
 150                                         ((red   & 0xf800) >>  1) |
 151                                         ((green & 0xf800) >>  6) |
 152                                         ((blue  & 0xf800) >> 11);
 153                         } else {
 154                                 /* 0:5:6:5 */
 155                                 ((u32*) (info->pseudo_palette))[regno] =
 156                                         ((red   & 0xf800)      ) |
 157                                         ((green & 0xfc00) >>  5) |
 158                                         ((blue  & 0xf800) >> 11);
 159                         }
 160                         break;
 161                 case 24:
 162                 case 32:
 163                         red   >>= 8;
 164                         green >>= 8;
 165                         blue  >>= 8;
 166                         ((u32 *)(info->pseudo_palette))[regno] =
 167                                 (red   << info->var.red.offset)   |
 168                                 (green << info->var.green.offset) |
 169                                 (blue  << info->var.blue.offset);
 170                         break;
 171                 }
 172         }
 173
 174         return err;
 175 }
 176
 177 static void vesafb_destroy(struct fb_info *info)
 178 {
 179         if (info->screen_base)
 180                 iounmap(info->screen_base);
 181         release_mem_region(info->aperture_base, info->aperture_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 __init 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 __init 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
 237         if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
 238                 return -ENODEV;
 239
 240         vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
 241         vesafb_fix.smem_start = screen_info.lfb_base;
 242         vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
 243         if (15 == vesafb_defined.bits_per_pixel)
 244                 vesafb_defined.bits_per_pixel = 16;
 245         vesafb_defined.xres = screen_info.lfb_width;
 246         vesafb_defined.yres = screen_info.lfb_height;
 247         vesafb_fix.line_length = screen_info.lfb_linelength;
 248         vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
 249                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
 250
 251         /*   size_vmode -- that is the amount of memory needed for the
 252          *                 used video mode, i.e. the minimum amount of
 253          *                 memory we need. */
 254         size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
 255
 256         /*   size_total -- all video memory we have. Used for mtrr
 257          *                 entries, ressource allocation and bounds
 258          *                 checking. */
 259         size_total = screen_info.lfb_size * 65536;
 260         if (vram_total)
 261                 size_total = vram_total * 1024 * 1024;
 262         if (size_total < size_vmode)
 263                 size_total = size_vmode;
 264
 265         /*   size_remap -- the amount of video memory we are going to
 266          *                 use for vesafb.  With modern cards it is no
 267          *                 option to simply use size_total as that
 268          *                 wastes plenty of kernel address space. */
 269         size_remap  = size_vmode * 2;
 270         if (vram_remap)
 271                 size_remap = vram_remap * 1024 * 1024;
 272         if (size_remap < size_vmode)
 273                 size_remap = size_vmode;
 274         if (size_remap > size_total)
 275                 size_remap = size_total;
 276         vesafb_fix.smem_len = size_remap;
 277
 278 #ifndef __i386__
 279         screen_info.vesapm_seg = 0;
 280 #endif
 281
 282         if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
 283                 printk(KERN_WARNING
 284                        "vesafb: cannot reserve video memory at 0x%lx\n",
 285                         vesafb_fix.smem_start);
 286                 /* We cannot make this fatal. Sometimes this comes from magic
 287                    spaces our resource handlers simply don't know about */
 288         }
 289
 290         info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
 291         if (!info) {
 292                 release_mem_region(vesafb_fix.smem_start, size_total);
 293                 return -ENOMEM;
 294         }
 295         info->pseudo_palette = info->par;
 296         info->par = NULL;
 297
 298         /* set vesafb aperture size for generic probing */
 299         info->aperture_base = screen_info.lfb_base;
 300         info->aperture_size = size_total;
 301
 302         info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
 303         if (!info->screen_base) {
 304                 printk(KERN_ERR
 305                        "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
 306                         vesafb_fix.smem_len, vesafb_fix.smem_start);
 307                 err = -EIO;
 308                 goto err;
 309         }
 310
 311         printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
 312                "using %dk, total %dk\n",
 313                vesafb_fix.smem_start, info->screen_base,
 314                size_remap/1024, size_total/1024);
 315         printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 316                vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
 317
 318         if (screen_info.vesapm_seg) {
 319                 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
 320                        screen_info.vesapm_seg,screen_info.vesapm_off);
 321         }
 322
 323         if (screen_info.vesapm_seg < 0xc000)
 324                 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
 325
 326         if (ypan || pmi_setpal) {
 327                 unsigned short *pmi_base;
 328                 pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
 329                 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
 330                 pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
 331                 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
 332                 if (pmi_base[3]) {
 333                         printk(KERN_INFO "vesafb: pmi: ports = ");
 334                                 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
 335                                         printk("%x ",pmi_base[i]);
 336                         printk("\n");
 337                         if (pmi_base[i] != 0xffff) {
 338                                 /*
 339                                  * memory areas not supported (yet?)
 340                                  *
 341                                  * Rules are: we have to set up a descriptor for the requested
 342                                  * memory area and pass it in the ES register to the BIOS function.
 343                                  */
 344                                 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
 345                                 ypan = pmi_setpal = 0;
 346                         }
 347                 }
 348         }
 349
 350         if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
 351                 printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
 352                                     "        colors may be incorrect\n");
 353                 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 354         }
 355
 356         vesafb_defined.xres_virtual = vesafb_defined.xres;
 357         vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
 358         if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
 359                 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
 360                        (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
 361         } else {
 362                 printk(KERN_INFO "vesafb: scrolling: redraw\n");
 363                 vesafb_defined.yres_virtual = vesafb_defined.yres;
 364                 ypan = 0;
 365         }
 366
 367         /* some dummy values for timing to make fbset happy */
 368         vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
 369         vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
 370         vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
 371
 372         vesafb_defined.red.offset    = screen_info.red_pos;
 373         vesafb_defined.red.length    = screen_info.red_size;
 374         vesafb_defined.green.offset  = screen_info.green_pos;
 375         vesafb_defined.green.length  = screen_info.green_size;
 376         vesafb_defined.blue.offset   = screen_info.blue_pos;
 377         vesafb_defined.blue.length   = screen_info.blue_size;
 378         vesafb_defined.transp.offset = screen_info.rsvd_pos;
 379         vesafb_defined.transp.length = screen_info.rsvd_size;
 380
 381         if (vesafb_defined.bits_per_pixel <= 8) {
 382                 depth = vesafb_defined.green.length;
 383                 vesafb_defined.red.length =
 384                 vesafb_defined.green.length =
 385                 vesafb_defined.blue.length =
 386                 vesafb_defined.bits_per_pixel;
 387         }
 388
 389         printk(KERN_INFO "vesafb: %s: "
 390                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 391                (vesafb_defined.bits_per_pixel > 8) ?
 392                "Truecolor" : (vga_compat || pmi_setpal) ?
 393                "Pseudocolor" : "Static Pseudocolor",
 394                screen_info.rsvd_size,
 395                screen_info.red_size,
 396                screen_info.green_size,
 397                screen_info.blue_size,
 398                screen_info.rsvd_pos,
 399                screen_info.red_pos,
 400                screen_info.green_pos,
 401                screen_info.blue_pos);
 402
 403         vesafb_fix.ypanstep  = ypan     ? 1 : 0;
 404         vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
 405
 406         /* request failure does not faze us, as vgacon probably has this
 407          * region already (FIXME) */
 408         request_region(0x3c0, 32, "vesafb");
 409
 410 #ifdef CONFIG_MTRR
 411         if (mtrr) {
 412                 unsigned int temp_size = size_total;
 413                 unsigned int type = 0;
 414
 415                 switch (mtrr) {
 416                 case 1:
 417                         type = MTRR_TYPE_UNCACHABLE;
 418                         break;
 419                 case 2:
 420                         type = MTRR_TYPE_WRBACK;
 421                         break;
 422                 case 3:
 423                         type = MTRR_TYPE_WRCOMB;
 424                         break;
 425                 case 4:
 426                         type = MTRR_TYPE_WRTHROUGH;
 427                         break;
 428                 default:
 429                         type = 0;
 430                         break;
 431                 }
 432
 433                 if (type) {
 434                         int rc;
 435
 436                         /* Find the largest power-of-two */
 437                         while (temp_size & (temp_size - 1))
 438                                 temp_size &= (temp_size - 1);
 439
 440                         /* Try and find a power of two to add */
 441                         do {
 442                                 rc = mtrr_add(vesafb_fix.smem_start, temp_size,
 443                                               type, 1);
 444                                 temp_size >>= 1;
 445                         } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
 446                 }
 447         }
 448 #endif
 449
 450         info->fbops = &vesafb_ops;
 451         info->var = vesafb_defined;
 452         info->fix = vesafb_fix;
 453         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
 454                 (ypan ? FBINFO_HWACCEL_YPAN : 0);
 455
 456         if (!ypan)
 457                 info->fbops->fb_pan_display = NULL;
 458
 459         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 460                 err = -ENOMEM;
 461                 goto err;
 462         }
 463         if (register_framebuffer(info)<0) {
 464                 err = -EINVAL;
 465                 fb_dealloc_cmap(&info->cmap);
 466                 goto err;
 467         }
 468         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 469                info->node, info->fix.id);
 470         return 0;
 471 err:
 472         if (info->screen_base)
 473                 iounmap(info->screen_base);
 474         framebuffer_release(info);
 475         release_mem_region(vesafb_fix.smem_start, size_total);
 476         return err;
 477 }
 478
 479 static struct platform_driver vesafb_driver = {
 480         .probe  = vesafb_probe,
 481         .driver = {
 482                 .name   = "vesafb",
 483         },
 484 };
 485
 486 static struct platform_device *vesafb_device;
 487
 488 static int __init vesafb_init(void)
 489 {
 490         int ret;
 491         char *option = NULL;
 492
 493         /* ignore error return of fb_get_options */
 494         fb_get_options("vesafb", &option);
 495         vesafb_setup(option);
 496         ret = platform_driver_register(&vesafb_driver);
 497
 498         if (!ret) {
 499                 vesafb_device = platform_device_alloc("vesafb", 0);
 500
 501                 if (vesafb_device)
 502                         ret = platform_device_add(vesafb_device);
 503                 else
 504                         ret = -ENOMEM;
 505
 506                 if (ret) {
 507                         platform_device_put(vesafb_device);
 508                         platform_driver_unregister(&vesafb_driver);
 509                 }
 510         }
 511
 512         return ret;
 513 }
 514 module_init(vesafb_init);
 515
 516 MODULE_LICENSE("GPL");