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