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 <linux/platform_device.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   = 0;
  51 static int             mtrr      = 0; /* disable mtrr */
  52 static int             vram_remap __initdata = 0; /* Set amount of memory to be used */
  53 static int             vram_total __initdata = 0; /* Set total amount of memory */
  54 static int             pmi_setpal = 0;  /* pmi for palette changes ??? */
  55 static int             ypan       = 0;  /* 0..nothing, 1..ypan, 2..ywrap */
  56 static unsigned short  *pmi_base  = NULL;
  57 static void            (*pmi_start)(void);
  58 static void            (*pmi_pal)(void);
  59 static int             depth;
  60 static int             vga_compat;
  61 /* --------------------------------------------------------------------- */
  62
  63 static int vesafb_pan_display(struct fb_var_screeninfo *var,
  64                               struct fb_info *info)
  65 {
  66 #ifdef __i386__
  67         int offset;
  68
  69         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
  70
  71         __asm__ __volatile__(
  72                 "call *(%%edi)"
  73                 : /* no return value */
  74                 : "a" (0x4f07),         /* EAX */
  75                   "b" (0),              /* EBX */
  76                   "c" (offset),         /* ECX */
  77                   "d" (offset >> 16),   /* EDX */
  78                   "D" (&pmi_start));    /* EDI */
  79 #endif
  80         return 0;
  81 }
  82
  83 static int vesa_setpalette(int regno, unsigned red, unsigned green,
  84                             unsigned blue)
  85 {
  86         int shift = 16 - depth;
  87         int err = -EINVAL;
  88
  89 #ifdef __i386__
  90         struct { u_char blue, green, red, pad; } entry;
  91
  92         if (pmi_setpal) {
  93                 entry.red   = red   >> shift;
  94                 entry.green = green >> shift;
  95                 entry.blue  = blue  >> shift;
  96                 entry.pad   = 0;
  97                 __asm__ __volatile__(
  98                 "call *(%%esi)"
  99                 : /* no return value */
 100                 : "a" (0x4f09),         /* EAX */
 101                   "b" (0),              /* EBX */
 102                   "c" (1),              /* ECX */
 103                   "d" (regno),          /* EDX */
 104                   "D" (&entry),         /* EDI */
 105                   "S" (&pmi_pal));      /* ESI */
 106                 err = 0;
 107         }
 108 #endif
 109
 110 /*
 111  * without protected mode interface and if VGA compatible,
 112  * try VGA registers...
 113  */
 114         if (err && vga_compat) {
 115                 outb_p(regno,       dac_reg);
 116                 outb_p(red   >> shift, dac_val);
 117                 outb_p(green >> shift, dac_val);
 118                 outb_p(blue  >> shift, dac_val);
 119                 err = 0;
 120         }
 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 struct fb_ops vesafb_ops = {
 177         .owner          = THIS_MODULE,
 178         .fb_setcolreg   = vesafb_setcolreg,
 179         .fb_pan_display = vesafb_pan_display,
 180         .fb_fillrect    = cfb_fillrect,
 181         .fb_copyarea    = cfb_copyarea,
 182         .fb_imageblit   = cfb_imageblit,
 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 platform_device *dev)
 220 {
 221         struct fb_info *info;
 222         int i, err;
 223         unsigned int size_vmode;
 224         unsigned int size_remap;
 225         unsigned int size_total;
 226
 227         if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
 228                 return -ENODEV;
 229
 230         vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
 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         if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
 336                 printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
 337                                     "        colors may be incorrect\n");
 338                 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 339         }
 340
 341         vesafb_defined.xres_virtual = vesafb_defined.xres;
 342         vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
 343         if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
 344                 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
 345                        (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
 346         } else {
 347                 printk(KERN_INFO "vesafb: scrolling: redraw\n");
 348                 vesafb_defined.yres_virtual = vesafb_defined.yres;
 349                 ypan = 0;
 350         }
 351
 352         /* some dummy values for timing to make fbset happy */
 353         vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
 354         vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
 355         vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
 356
 357         vesafb_defined.red.offset    = screen_info.red_pos;
 358         vesafb_defined.red.length    = screen_info.red_size;
 359         vesafb_defined.green.offset  = screen_info.green_pos;
 360         vesafb_defined.green.length  = screen_info.green_size;
 361         vesafb_defined.blue.offset   = screen_info.blue_pos;
 362         vesafb_defined.blue.length   = screen_info.blue_size;
 363         vesafb_defined.transp.offset = screen_info.rsvd_pos;
 364         vesafb_defined.transp.length = screen_info.rsvd_size;
 365
 366         if (vesafb_defined.bits_per_pixel <= 8) {
 367                 depth = vesafb_defined.green.length;
 368                 vesafb_defined.red.length =
 369                 vesafb_defined.green.length =
 370                 vesafb_defined.blue.length =
 371                 vesafb_defined.bits_per_pixel;
 372         }
 373
 374         printk(KERN_INFO "vesafb: %s: "
 375                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 376                (vesafb_defined.bits_per_pixel > 8) ?
 377                "Truecolor" : (vga_compat || pmi_setpal) ?
 378                "Pseudocolor" : "Static Pseudocolor",
 379                screen_info.rsvd_size,
 380                screen_info.red_size,
 381                screen_info.green_size,
 382                screen_info.blue_size,
 383                screen_info.rsvd_pos,
 384                screen_info.red_pos,
 385                screen_info.green_pos,
 386                screen_info.blue_pos);
 387
 388         vesafb_fix.ypanstep  = ypan     ? 1 : 0;
 389         vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
 390
 391         /* request failure does not faze us, as vgacon probably has this
 392          * region already (FIXME) */
 393         request_region(0x3c0, 32, "vesafb");
 394
 395 #ifdef CONFIG_MTRR
 396         if (mtrr) {
 397                 unsigned int temp_size = size_total;
 398                 unsigned int type = 0;
 399
 400                 switch (mtrr) {
 401                 case 1:
 402                         type = MTRR_TYPE_UNCACHABLE;
 403                         break;
 404                 case 2:
 405                         type = MTRR_TYPE_WRBACK;
 406                         break;
 407                 case 3:
 408                         type = MTRR_TYPE_WRCOMB;
 409                         break;
 410                 case 4:
 411                         type = MTRR_TYPE_WRTHROUGH;
 412                         break;
 413                 default:
 414                         type = 0;
 415                         break;
 416                 }
 417
 418                 if (type) {
 419                         int rc;
 420
 421                         /* Find the largest power-of-two */
 422                         while (temp_size & (temp_size - 1))
 423                                 temp_size &= (temp_size - 1);
 424
 425                         /* Try and find a power of two to add */
 426                         do {
 427                                 rc = mtrr_add(vesafb_fix.smem_start, temp_size,
 428                                               type, 1);
 429                                 temp_size >>= 1;
 430                         } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
 431                 }
 432         }
 433 #endif
 434
 435         info->fbops = &vesafb_ops;
 436         info->var = vesafb_defined;
 437         info->fix = vesafb_fix;
 438         info->flags = FBINFO_FLAG_DEFAULT |
 439                 (ypan) ? FBINFO_HWACCEL_YPAN : 0;
 440
 441         if (!ypan)
 442                 info->fbops->fb_pan_display = NULL;
 443
 444         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 445                 err = -ENOMEM;
 446                 goto err;
 447         }
 448         if (register_framebuffer(info)<0) {
 449                 err = -EINVAL;
 450                 fb_dealloc_cmap(&info->cmap);
 451                 goto err;
 452         }
 453         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 454                info->node, info->fix.id);
 455         return 0;
 456 err:
 457         framebuffer_release(info);
 458         release_mem_region(vesafb_fix.smem_start, size_total);
 459         return err;
 460 }
 461
 462 static struct platform_driver vesafb_driver = {
 463         .probe  = vesafb_probe,
 464         .driver = {
 465                 .name   = "vesafb",
 466         },
 467 };
 468
 469 static struct platform_device *vesafb_device;
 470
 471 static int __init vesafb_init(void)
 472 {
 473         int ret;
 474         char *option = NULL;
 475
 476         /* ignore error return of fb_get_options */
 477         fb_get_options("vesafb", &option);
 478         vesafb_setup(option);
 479         ret = platform_driver_register(&vesafb_driver);
 480
 481         if (!ret) {
 482                 vesafb_device = platform_device_alloc("vesafb", 0);
 483
 484                 if (vesafb_device)
 485                         ret = platform_device_add(vesafb_device);
 486                 else
 487                         ret = -ENOMEM;
 488
 489                 if (ret) {
 490                         platform_device_put(vesafb_device);
 491                         platform_driver_unregister(&vesafb_driver);
 492                 }
 493         }
 494
 495         return ret;
 496 }
 497 module_init(vesafb_init);
 498
 499 MODULE_LICENSE("GPL");