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 <video/vga.h>
  23 #include <asm/io.h>
  24 #include <asm/mtrr.h>
  25
  26 #define dac_reg (0x3c8)
  27 #define dac_val (0x3c9)
  28
  29 /* --------------------------------------------------------------------- */
  30
  31 static struct fb_var_screeninfo vesafb_defined __initdata = {
  32         .activate       = FB_ACTIVATE_NOW,
  33         .height         = -1,
  34         .width          = -1,
  35         .right_margin   = 32,
  36         .upper_margin   = 16,
  37         .lower_margin   = 4,
  38         .vsync_len      = 4,
  39         .vmode          = FB_VMODE_NONINTERLACED,
  40 };
  41
  42 static struct fb_fix_screeninfo vesafb_fix __initdata = {
  43         .id     = "VESA VGA",
  44         .type   = FB_TYPE_PACKED_PIXELS,
  45         .accel  = FB_ACCEL_NONE,
  46 };
  47
  48 static int             inverse   = 0;
  49 static int             mtrr      = 3; /* default to write-combining */
  50 static int             vram_remap __initdata = 0; /* Set amount of memory to be used */
  51 static int             vram_total __initdata = 0; /* Set total amount of memory */
  52 static int             pmi_setpal = 0;  /* pmi for palette changes ??? */
  53 static int             ypan       = 0;  /* 0..nothing, 1..ypan, 2..ywrap */
  54 static unsigned short  *pmi_base  = NULL;
  55 static void            (*pmi_start)(void);
  56 static void            (*pmi_pal)(void);
  57 static int             depth;
  58 static int             vga_compat;
  59
  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         if (!ypan)
  69                 return -EINVAL;
  70         if (var->xoffset)
  71                 return -EINVAL;
  72         if (var->yoffset > var->yres_virtual)
  73                 return -EINVAL;
  74         if ((ypan==1) && var->yoffset+var->yres > var->yres_virtual)
  75                 return -EINVAL;
  76
  77         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
  78
  79         __asm__ __volatile__(
  80                 "call *(%%edi)"
  81                 : /* no return value */
  82                 : "a" (0x4f07),         /* EAX */
  83                   "b" (0),              /* EBX */
  84                   "c" (offset),         /* ECX */
  85                   "d" (offset >> 16),   /* EDX */
  86                   "D" (&pmi_start));    /* EDI */
  87 #endif
  88         return 0;
  89 }
  90
  91 static int vesafb_blank(int blank, struct fb_info *info)
  92 {
  93         int err = 1;
  94
  95         if (vga_compat) {
  96                 int loop = 10000;
  97                 u8 seq = 0, crtc17 = 0;
  98
  99                 err = 0;
 100
 101                 if (blank) {
 102                         seq = 0x20;
 103                         crtc17 = 0x00;
 104                 } else {
 105                         seq = 0x00;
 106                         crtc17 = 0x80;
 107                 }
 108
 109                 vga_wseq(NULL, 0x00, 0x01);
 110                 seq |= vga_rseq(NULL, 0x01) & ~0x20;
 111                 vga_wseq(NULL, 0x00, seq);
 112
 113                 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
 114                 while (loop--);
 115                 vga_wcrt(NULL, 0x17, crtc17);
 116                 vga_wseq(NULL, 0x00, 0x03);
 117         }
 118
 119         return err;
 120 }
 121
 122 static void vesa_setpalette(int regno, unsigned red, unsigned green,
 123                             unsigned blue)
 124 {
 125 #ifdef __i386__
 126         struct { u_char blue, green, red, pad; } entry;
 127         int shift = 16 - depth;
 128
 129         if (pmi_setpal) {
 130                 entry.red   = red   >> shift;
 131                 entry.green = green >> shift;
 132                 entry.blue  = blue  >> shift;
 133                 entry.pad   = 0;
 134                 __asm__ __volatile__(
 135                 "call *(%%esi)"
 136                 : /* no return value */
 137                 : "a" (0x4f09),         /* EAX */
 138                   "b" (0),              /* EBX */
 139                   "c" (1),              /* ECX */
 140                   "d" (regno),          /* EDX */
 141                   "D" (&entry),         /* EDI */
 142                   "S" (&pmi_pal));      /* ESI */
 143         } else {
 144                 /* without protected mode interface, try VGA registers... */
 145                 outb_p(regno,       dac_reg);
 146                 outb_p(red   >> shift, dac_val);
 147                 outb_p(green >> shift, dac_val);
 148                 outb_p(blue  >> shift, dac_val);
 149         }
 150 #endif
 151 }
 152
 153 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 154                             unsigned blue, unsigned transp,
 155                             struct fb_info *info)
 156 {
 157         /*
 158          *  Set a single color register. The values supplied are
 159          *  already rounded down to the hardware's capabilities
 160          *  (according to the entries in the `var' structure). Return
 161          *  != 0 for invalid regno.
 162          */
 163
 164         if (regno >= info->cmap.len)
 165                 return 1;
 166
 167         switch (info->var.bits_per_pixel) {
 168         case 8:
 169                 vesa_setpalette(regno,red,green,blue);
 170                 break;
 171         case 16:
 172                 if (info->var.red.offset == 10) {
 173                         /* 1:5:5:5 */
 174                         ((u32*) (info->pseudo_palette))[regno] =
 175                                         ((red   & 0xf800) >>  1) |
 176                                         ((green & 0xf800) >>  6) |
 177                                         ((blue  & 0xf800) >> 11);
 178                 } else {
 179                         /* 0:5:6:5 */
 180                         ((u32*) (info->pseudo_palette))[regno] =
 181                                         ((red   & 0xf800)      ) |
 182                                         ((green & 0xfc00) >>  5) |
 183                                         ((blue  & 0xf800) >> 11);
 184                 }
 185                 break;
 186         case 24:
 187                 red   >>= 8;
 188                 green >>= 8;
 189                 blue  >>= 8;
 190                 ((u32 *)(info->pseudo_palette))[regno] =
 191                         (red   << info->var.red.offset)   |
 192                         (green << info->var.green.offset) |
 193                         (blue  << info->var.blue.offset);
 194                 break;
 195         case 32:
 196                 red   >>= 8;
 197                 green >>= 8;
 198                 blue  >>= 8;
 199                 ((u32 *)(info->pseudo_palette))[regno] =
 200                         (red   << info->var.red.offset)   |
 201                         (green << info->var.green.offset) |
 202                         (blue  << info->var.blue.offset);
 203                 break;
 204     }
 205     return 0;
 206 }
 207
 208 static struct fb_ops vesafb_ops = {
 209         .owner          = THIS_MODULE,
 210         .fb_setcolreg   = vesafb_setcolreg,
 211         .fb_pan_display = vesafb_pan_display,
 212         .fb_blank       = vesafb_blank,
 213         .fb_fillrect    = cfb_fillrect,
 214         .fb_copyarea    = cfb_copyarea,
 215         .fb_imageblit   = cfb_imageblit,
 216         .fb_cursor      = soft_cursor,
 217 };
 218
 219 static int __init vesafb_setup(char *options)
 220 {
 221         char *this_opt;
 222
 223         if (!options || !*options)
 224                 return 0;
 225
 226         while ((this_opt = strsep(&options, ",")) != NULL) {
 227                 if (!*this_opt) continue;
 228
 229                 if (! strcmp(this_opt, "inverse"))
 230                         inverse=1;
 231                 else if (! strcmp(this_opt, "redraw"))
 232                         ypan=0;
 233                 else if (! strcmp(this_opt, "ypan"))
 234                         ypan=1;
 235                 else if (! strcmp(this_opt, "ywrap"))
 236                         ypan=2;
 237                 else if (! strcmp(this_opt, "vgapal"))
 238                         pmi_setpal=0;
 239                 else if (! strcmp(this_opt, "pmipal"))
 240                         pmi_setpal=1;
 241                 else if (! strncmp(this_opt, "mtrr:", 5))
 242                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
 243                 else if (! strcmp(this_opt, "nomtrr"))
 244                         mtrr=0;
 245                 else if (! strncmp(this_opt, "vtotal:", 7))
 246                         vram_total = simple_strtoul(this_opt+7, NULL, 0);
 247                 else if (! strncmp(this_opt, "vremap:", 7))
 248                         vram_remap = simple_strtoul(this_opt+7, NULL, 0);
 249         }
 250         return 0;
 251 }
 252
 253 static int __init vesafb_probe(struct device *device)
 254 {
 255         struct platform_device *dev = to_platform_device(device);
 256         struct fb_info *info;
 257         int i, err;
 258         unsigned int size_vmode;
 259         unsigned int size_remap;
 260         unsigned int size_total;
 261
 262         if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
 263                 return -ENODEV;
 264
 265         vesafb_fix.smem_start = screen_info.lfb_base;
 266         vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
 267         if (15 == vesafb_defined.bits_per_pixel)
 268                 vesafb_defined.bits_per_pixel = 16;
 269         vesafb_defined.xres = screen_info.lfb_width;
 270         vesafb_defined.yres = screen_info.lfb_height;
 271         vesafb_fix.line_length = screen_info.lfb_linelength;
 272         vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
 273                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
 274
 275         /*   size_vmode -- that is the amount of memory needed for the
 276          *                 used video mode, i.e. the minimum amount of
 277          *                 memory we need. */
 278         size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
 279
 280         /*   size_total -- all video memory we have. Used for mtrr
 281          *                 entries, ressource allocation and bounds
 282          *                 checking. */
 283         size_total = screen_info.lfb_size * 65536;
 284         if (vram_total)
 285                 size_total = vram_total * 1024 * 1024;
 286         if (size_total < size_vmode)
 287                 size_total = size_vmode;
 288
 289         /*   size_remap -- the amount of video memory we are going to
 290          *                 use for vesafb.  With modern cards it is no
 291          *                 option to simply use size_total as that
 292          *                 wastes plenty of kernel address space. */
 293         size_remap  = size_vmode * 2;
 294         if (vram_remap)
 295                 size_remap = vram_remap * 1024 * 1024;
 296         if (size_remap < size_vmode)
 297                 size_remap = size_vmode;
 298         if (size_remap > size_total)
 299                 size_remap = size_total;
 300         vesafb_fix.smem_len = size_remap;
 301
 302 #ifndef __i386__
 303         screen_info.vesapm_seg = 0;
 304 #endif
 305
 306         if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
 307                 printk(KERN_WARNING
 308                        "vesafb: cannot reserve video memory at 0x%lx\n",
 309                         vesafb_fix.smem_start);
 310                 /* We cannot make this fatal. Sometimes this comes from magic
 311                    spaces our resource handlers simply don't know about */
 312         }
 313
 314         info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
 315         if (!info) {
 316                 release_mem_region(vesafb_fix.smem_start, size_total);
 317                 return -ENOMEM;
 318         }
 319         info->pseudo_palette = info->par;
 320         info->par = NULL;
 321
 322         info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
 323         if (!info->screen_base) {
 324                 printk(KERN_ERR
 325                        "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
 326                         vesafb_fix.smem_len, vesafb_fix.smem_start);
 327                 err = -EIO;
 328                 goto err;
 329         }
 330
 331         printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
 332                "using %dk, total %dk\n",
 333                vesafb_fix.smem_start, info->screen_base,
 334                size_remap/1024, size_total/1024);
 335         printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 336                vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
 337
 338         if (screen_info.vesapm_seg) {
 339                 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
 340                        screen_info.vesapm_seg,screen_info.vesapm_off);
 341         }
 342
 343         if (screen_info.vesapm_seg < 0xc000)
 344                 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
 345
 346         if (ypan || pmi_setpal) {
 347                 pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
 348                 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
 349                 pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
 350                 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
 351                 if (pmi_base[3]) {
 352                         printk(KERN_INFO "vesafb: pmi: ports = ");
 353                                 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
 354                                         printk("%x ",pmi_base[i]);
 355                         printk("\n");
 356                         if (pmi_base[i] != 0xffff) {
 357                                 /*
 358                                  * memory areas not supported (yet?)
 359                                  *
 360                                  * Rules are: we have to set up a descriptor for the requested
 361                                  * memory area and pass it in the ES register to the BIOS function.
 362                                  */
 363                                 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
 364                                 ypan = pmi_setpal = 0;
 365                         }
 366                 }
 367         }
 368
 369         vesafb_defined.xres_virtual = vesafb_defined.xres;
 370         vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
 371         if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
 372                 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
 373                        (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
 374         } else {
 375                 printk(KERN_INFO "vesafb: scrolling: redraw\n");
 376                 vesafb_defined.yres_virtual = vesafb_defined.yres;
 377                 ypan = 0;
 378         }
 379
 380         /* some dummy values for timing to make fbset happy */
 381         vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
 382         vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
 383         vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
 384
 385         vesafb_defined.red.offset    = screen_info.red_pos;
 386         vesafb_defined.red.length    = screen_info.red_size;
 387         vesafb_defined.green.offset  = screen_info.green_pos;
 388         vesafb_defined.green.length  = screen_info.green_size;
 389         vesafb_defined.blue.offset   = screen_info.blue_pos;
 390         vesafb_defined.blue.length   = screen_info.blue_size;
 391         vesafb_defined.transp.offset = screen_info.rsvd_pos;
 392         vesafb_defined.transp.length = screen_info.rsvd_size;
 393
 394         if (vesafb_defined.bits_per_pixel <= 8) {
 395                 depth = vesafb_defined.green.length;
 396                 vesafb_defined.red.length =
 397                 vesafb_defined.green.length =
 398                 vesafb_defined.blue.length =
 399                 vesafb_defined.bits_per_pixel;
 400         }
 401
 402         printk(KERN_INFO "vesafb: %s: "
 403                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 404                (vesafb_defined.bits_per_pixel > 8) ?
 405                "Truecolor" : "Pseudocolor",
 406                screen_info.rsvd_size,
 407                screen_info.red_size,
 408                screen_info.green_size,
 409                screen_info.blue_size,
 410                screen_info.rsvd_pos,
 411                screen_info.red_pos,
 412                screen_info.green_pos,
 413                screen_info.blue_pos);
 414
 415         vesafb_fix.ypanstep  = ypan     ? 1 : 0;
 416         vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
 417
 418         /* request failure does not faze us, as vgacon probably has this
 419          * region already (FIXME) */
 420         request_region(0x3c0, 32, "vesafb");
 421
 422         if (mtrr) {
 423                 unsigned int temp_size = size_total;
 424                 unsigned int type = 0;
 425
 426                 switch (mtrr) {
 427                 case 1:
 428                         type = MTRR_TYPE_UNCACHABLE;
 429                         break;
 430                 case 2:
 431                         type = MTRR_TYPE_WRBACK;
 432                         break;
 433                 case 3:
 434                         type = MTRR_TYPE_WRCOMB;
 435                         break;
 436                 case 4:
 437                         type = MTRR_TYPE_WRTHROUGH;
 438                         break;
 439                 default:
 440                         type = 0;
 441                         break;
 442                 }
 443
 444                 if (type) {
 445                         int rc;
 446
 447                         /* Find the largest power-of-two */
 448                         while (temp_size & (temp_size - 1))
 449                                 temp_size &= (temp_size - 1);
 450
 451                         /* Try and find a power of two to add */
 452                         do {
 453                                 rc = mtrr_add(vesafb_fix.smem_start, temp_size,
 454                                               type, 1);
 455                                 temp_size >>= 1;
 456                         } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
 457                 }
 458         }
 459
 460         info->fbops = &vesafb_ops;
 461         info->var = vesafb_defined;
 462         info->fix = vesafb_fix;
 463         info->flags = FBINFO_FLAG_DEFAULT |
 464                 (ypan) ? FBINFO_HWACCEL_YPAN : 0;
 465
 466         vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
 467         printk("vesafb: Mode is %sVGA compatible\n",
 468                (vga_compat) ? "" : "not ");
 469
 470         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 471                 err = -ENOMEM;
 472                 goto err;
 473         }
 474         if (register_framebuffer(info)<0) {
 475                 err = -EINVAL;
 476                 fb_dealloc_cmap(&info->cmap);
 477                 goto err;
 478         }
 479         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 480                info->node, info->fix.id);
 481         return 0;
 482 err:
 483         framebuffer_release(info);
 484         release_mem_region(vesafb_fix.smem_start, size_total);
 485         return err;
 486 }
 487
 488 static struct device_driver vesafb_driver = {
 489         .name   = "vesafb",
 490         .bus    = &platform_bus_type,
 491         .probe  = vesafb_probe,
 492 };
 493
 494 static struct platform_device vesafb_device = {
 495         .name   = "vesafb",
 496 };
 497
 498 static int __init vesafb_init(void)
 499 {
 500         int ret;
 501         char *option = NULL;
 502
 503         /* ignore error return of fb_get_options */
 504         fb_get_options("vesafb", &option);
 505         vesafb_setup(option);
 506         ret = driver_register(&vesafb_driver);
 507
 508         if (!ret) {
 509                 ret = platform_device_register(&vesafb_device);
 510                 if (ret)
 511                         driver_unregister(&vesafb_driver);
 512         }
 513         return ret;
 514 }
 515 module_init(vesafb_init);
 516
 517 MODULE_LICENSE("GPL");