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