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      = 3; /* default to write-combining */
  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
  64 static int vesafb_pan_display(struct fb_var_screeninfo *var,
  65                               struct fb_info *info)
  66 {
  67 #ifdef __i386__
  68         int offset;
  69
  70         if (!ypan)
  71                 return -EINVAL;
  72         if (var->xoffset)
  73                 return -EINVAL;
  74         if (var->yoffset > var->yres_virtual)
  75                 return -EINVAL;
  76         if ((ypan==1) && var->yoffset+var->yres > var->yres_virtual)
  77                 return -EINVAL;
  78
  79         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
  80
  81         __asm__ __volatile__(
  82                 "call *(%%edi)"
  83                 : /* no return value */
  84                 : "a" (0x4f07),         /* EAX */
  85                   "b" (0),              /* EBX */
  86                   "c" (offset),         /* ECX */
  87                   "d" (offset >> 16),   /* EDX */
  88                   "D" (&pmi_start));    /* EDI */
  89 #endif
  90         return 0;
  91 }
  92
  93 static int vesafb_blank(int blank, struct fb_info *info)
  94 {
  95         int err = 1;
  96
  97         if (vga_compat) {
  98                 int loop = 10000;
  99                 u8 seq = 0, crtc17 = 0;
 100
 101                 if (blank == FB_BLANK_POWERDOWN) {
 102                         seq = 0x20;
 103                         crtc17 = 0x00;
 104                         err = 0;
 105                 } else {
 106                         seq = 0x00;
 107                         crtc17 = 0x80;
 108                         err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
 109                 }
 110
 111                 vga_wseq(NULL, 0x00, 0x01);
 112                 seq |= vga_rseq(NULL, 0x01) & ~0x20;
 113                 vga_wseq(NULL, 0x00, seq);
 114
 115                 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
 116                 while (loop--);
 117                 vga_wcrt(NULL, 0x17, crtc17);
 118                 vga_wseq(NULL, 0x00, 0x03);
 119         }
 120
 121         return err;
 122 }
 123
 124 static void vesa_setpalette(int regno, unsigned red, unsigned green,
 125                             unsigned blue)
 126 {
 127 #ifdef __i386__
 128         struct { u_char blue, green, red, pad; } entry;
 129         int shift = 16 - depth;
 130
 131         if (pmi_setpal) {
 132                 entry.red   = red   >> shift;
 133                 entry.green = green >> shift;
 134                 entry.blue  = blue  >> shift;
 135                 entry.pad   = 0;
 136                 __asm__ __volatile__(
 137                 "call *(%%esi)"
 138                 : /* no return value */
 139                 : "a" (0x4f09),         /* EAX */
 140                   "b" (0),              /* EBX */
 141                   "c" (1),              /* ECX */
 142                   "d" (regno),          /* EDX */
 143                   "D" (&entry),         /* EDI */
 144                   "S" (&pmi_pal));      /* ESI */
 145         } else {
 146                 /* without protected mode interface, try VGA registers... */
 147                 outb_p(regno,       dac_reg);
 148                 outb_p(red   >> shift, dac_val);
 149                 outb_p(green >> shift, dac_val);
 150                 outb_p(blue  >> shift, dac_val);
 151         }
 152 #endif
 153 }
 154
 155 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 156                             unsigned blue, unsigned transp,
 157                             struct fb_info *info)
 158 {
 159         /*
 160          *  Set a single color register. The values supplied are
 161          *  already rounded down to the hardware's capabilities
 162          *  (according to the entries in the `var' structure). Return
 163          *  != 0 for invalid regno.
 164          */
 165
 166         if (regno >= info->cmap.len)
 167                 return 1;
 168
 169         switch (info->var.bits_per_pixel) {
 170         case 8:
 171                 vesa_setpalette(regno,red,green,blue);
 172                 break;
 173         case 16:
 174                 if (info->var.red.offset == 10) {
 175                         /* 1:5:5:5 */
 176                         ((u32*) (info->pseudo_palette))[regno] =
 177                                         ((red   & 0xf800) >>  1) |
 178                                         ((green & 0xf800) >>  6) |
 179                                         ((blue  & 0xf800) >> 11);
 180                 } else {
 181                         /* 0:5:6:5 */
 182                         ((u32*) (info->pseudo_palette))[regno] =
 183                                         ((red   & 0xf800)      ) |
 184                                         ((green & 0xfc00) >>  5) |
 185                                         ((blue  & 0xf800) >> 11);
 186                 }
 187                 break;
 188         case 24:
 189                 red   >>= 8;
 190                 green >>= 8;
 191                 blue  >>= 8;
 192                 ((u32 *)(info->pseudo_palette))[regno] =
 193                         (red   << info->var.red.offset)   |
 194                         (green << info->var.green.offset) |
 195                         (blue  << info->var.blue.offset);
 196                 break;
 197         case 32:
 198                 red   >>= 8;
 199                 green >>= 8;
 200                 blue  >>= 8;
 201                 ((u32 *)(info->pseudo_palette))[regno] =
 202                         (red   << info->var.red.offset)   |
 203                         (green << info->var.green.offset) |
 204                         (blue  << info->var.blue.offset);
 205                 break;
 206     }
 207     return 0;
 208 }
 209
 210 static struct fb_ops vesafb_ops = {
 211         .owner          = THIS_MODULE,
 212         .fb_setcolreg   = vesafb_setcolreg,
 213         .fb_pan_display = vesafb_pan_display,
 214         .fb_blank       = vesafb_blank,
 215         .fb_fillrect    = cfb_fillrect,
 216         .fb_copyarea    = cfb_copyarea,
 217         .fb_imageblit   = cfb_imageblit,
 218 };
 219
 220 static int __init vesafb_setup(char *options)
 221 {
 222         char *this_opt;
 223
 224         if (!options || !*options)
 225                 return 0;
 226
 227         while ((this_opt = strsep(&options, ",")) != NULL) {
 228                 if (!*this_opt) continue;
 229
 230                 if (! strcmp(this_opt, "inverse"))
 231                         inverse=1;
 232                 else if (! strcmp(this_opt, "redraw"))
 233                         ypan=0;
 234                 else if (! strcmp(this_opt, "ypan"))
 235                         ypan=1;
 236                 else if (! strcmp(this_opt, "ywrap"))
 237                         ypan=2;
 238                 else if (! strcmp(this_opt, "vgapal"))
 239                         pmi_setpal=0;
 240                 else if (! strcmp(this_opt, "pmipal"))
 241                         pmi_setpal=1;
 242                 else if (! strncmp(this_opt, "mtrr:", 5))
 243                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
 244                 else if (! strcmp(this_opt, "nomtrr"))
 245                         mtrr=0;
 246                 else if (! strncmp(this_opt, "vtotal:", 7))
 247                         vram_total = simple_strtoul(this_opt+7, NULL, 0);
 248                 else if (! strncmp(this_opt, "vremap:", 7))
 249                         vram_remap = simple_strtoul(this_opt+7, NULL, 0);
 250         }
 251         return 0;
 252 }
 253
 254 static int __init vesafb_probe(struct device *device)
 255 {
 256         struct platform_device *dev = to_platform_device(device);
 257         struct fb_info *info;
 258         int i, err;
 259         unsigned int size_vmode;
 260         unsigned int size_remap;
 261         unsigned int size_total;
 262
 263         if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
 264                 return -ENODEV;
 265
 266         vesafb_fix.smem_start = screen_info.lfb_base;
 267         vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
 268         if (15 == vesafb_defined.bits_per_pixel)
 269                 vesafb_defined.bits_per_pixel = 16;
 270         vesafb_defined.xres = screen_info.lfb_width;
 271         vesafb_defined.yres = screen_info.lfb_height;
 272         vesafb_fix.line_length = screen_info.lfb_linelength;
 273         vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
 274                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
 275
 276         /*   size_vmode -- that is the amount of memory needed for the
 277          *                 used video mode, i.e. the minimum amount of
 278          *                 memory we need. */
 279         size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
 280
 281         /*   size_total -- all video memory we have. Used for mtrr
 282          *                 entries, ressource allocation and bounds
 283          *                 checking. */
 284         size_total = screen_info.lfb_size * 65536;
 285         if (vram_total)
 286                 size_total = vram_total * 1024 * 1024;
 287         if (size_total < size_vmode)
 288                 size_total = size_vmode;
 289
 290         /*   size_remap -- the amount of video memory we are going to
 291          *                 use for vesafb.  With modern cards it is no
 292          *                 option to simply use size_total as that
 293          *                 wastes plenty of kernel address space. */
 294         size_remap  = size_vmode * 2;
 295         if (vram_remap)
 296                 size_remap = vram_remap * 1024 * 1024;
 297         if (size_remap < size_vmode)
 298                 size_remap = size_vmode;
 299         if (size_remap > size_total)
 300                 size_remap = size_total;
 301         vesafb_fix.smem_len = size_remap;
 302
 303 #ifndef __i386__
 304         screen_info.vesapm_seg = 0;
 305 #endif
 306
 307         if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
 308                 printk(KERN_WARNING
 309                        "vesafb: cannot reserve video memory at 0x%lx\n",
 310                         vesafb_fix.smem_start);
 311                 /* We cannot make this fatal. Sometimes this comes from magic
 312                    spaces our resource handlers simply don't know about */
 313         }
 314
 315         info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
 316         if (!info) {
 317                 release_mem_region(vesafb_fix.smem_start, size_total);
 318                 return -ENOMEM;
 319         }
 320         info->pseudo_palette = info->par;
 321         info->par = NULL;
 322
 323         info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
 324         if (!info->screen_base) {
 325                 printk(KERN_ERR
 326                        "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
 327                         vesafb_fix.smem_len, vesafb_fix.smem_start);
 328                 err = -EIO;
 329                 goto err;
 330         }
 331
 332         printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
 333                "using %dk, total %dk\n",
 334                vesafb_fix.smem_start, info->screen_base,
 335                size_remap/1024, size_total/1024);
 336         printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 337                vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
 338
 339         if (screen_info.vesapm_seg) {
 340                 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
 341                        screen_info.vesapm_seg,screen_info.vesapm_off);
 342         }
 343
 344         if (screen_info.vesapm_seg < 0xc000)
 345                 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
 346
 347         if (ypan || pmi_setpal) {
 348                 pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
 349                 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
 350                 pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
 351                 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
 352                 if (pmi_base[3]) {
 353                         printk(KERN_INFO "vesafb: pmi: ports = ");
 354                                 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
 355                                         printk("%x ",pmi_base[i]);
 356                         printk("\n");
 357                         if (pmi_base[i] != 0xffff) {
 358                                 /*
 359                                  * memory areas not supported (yet?)
 360                                  *
 361                                  * Rules are: we have to set up a descriptor for the requested
 362                                  * memory area and pass it in the ES register to the BIOS function.
 363                                  */
 364                                 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
 365                                 ypan = pmi_setpal = 0;
 366                         }
 367                 }
 368         }
 369
 370         vesafb_defined.xres_virtual = vesafb_defined.xres;
 371         vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
 372         if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
 373                 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
 374                        (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
 375         } else {
 376                 printk(KERN_INFO "vesafb: scrolling: redraw\n");
 377                 vesafb_defined.yres_virtual = vesafb_defined.yres;
 378                 ypan = 0;
 379         }
 380
 381         /* some dummy values for timing to make fbset happy */
 382         vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
 383         vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
 384         vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
 385
 386         vesafb_defined.red.offset    = screen_info.red_pos;
 387         vesafb_defined.red.length    = screen_info.red_size;
 388         vesafb_defined.green.offset  = screen_info.green_pos;
 389         vesafb_defined.green.length  = screen_info.green_size;
 390         vesafb_defined.blue.offset   = screen_info.blue_pos;
 391         vesafb_defined.blue.length   = screen_info.blue_size;
 392         vesafb_defined.transp.offset = screen_info.rsvd_pos;
 393         vesafb_defined.transp.length = screen_info.rsvd_size;
 394
 395         if (vesafb_defined.bits_per_pixel <= 8) {
 396                 depth = vesafb_defined.green.length;
 397                 vesafb_defined.red.length =
 398                 vesafb_defined.green.length =
 399                 vesafb_defined.blue.length =
 400                 vesafb_defined.bits_per_pixel;
 401         }
 402
 403         printk(KERN_INFO "vesafb: %s: "
 404                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 405                (vesafb_defined.bits_per_pixel > 8) ?
 406                "Truecolor" : "Pseudocolor",
 407                screen_info.rsvd_size,
 408                screen_info.red_size,
 409                screen_info.green_size,
 410                screen_info.blue_size,
 411                screen_info.rsvd_pos,
 412                screen_info.red_pos,
 413                screen_info.green_pos,
 414                screen_info.blue_pos);
 415
 416         vesafb_fix.ypanstep  = ypan     ? 1 : 0;
 417         vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
 418
 419         /* request failure does not faze us, as vgacon probably has this
 420          * region already (FIXME) */
 421         request_region(0x3c0, 32, "vesafb");
 422
 423         if (mtrr) {
 424                 unsigned int temp_size = size_total;
 425                 unsigned int type = 0;
 426
 427                 switch (mtrr) {
 428                 case 1:
 429                         type = MTRR_TYPE_UNCACHABLE;
 430                         break;
 431                 case 2:
 432                         type = MTRR_TYPE_WRBACK;
 433                         break;
 434                 case 3:
 435                         type = MTRR_TYPE_WRCOMB;
 436                         break;
 437                 case 4:
 438                         type = MTRR_TYPE_WRTHROUGH;
 439                         break;
 440                 default:
 441                         type = 0;
 442                         break;
 443                 }
 444
 445                 if (type) {
 446                         int rc;
 447
 448                         /* Find the largest power-of-two */
 449                         while (temp_size & (temp_size - 1))
 450                                 temp_size &= (temp_size - 1);
 451
 452                         /* Try and find a power of two to add */
 453                         do {
 454                                 rc = mtrr_add(vesafb_fix.smem_start, temp_size,
 455                                               type, 1);
 456                                 temp_size >>= 1;
 457                         } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
 458                 }
 459         }
 460
 461         info->fbops = &vesafb_ops;
 462         info->var = vesafb_defined;
 463         info->fix = vesafb_fix;
 464         info->flags = FBINFO_FLAG_DEFAULT |
 465                 (ypan) ? FBINFO_HWACCEL_YPAN : 0;
 466
 467         vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
 468         printk("vesafb: Mode is %sVGA compatible\n",
 469                (vga_compat) ? "" : "not ");
 470
 471         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 472                 err = -ENOMEM;
 473                 goto err;
 474         }
 475         if (register_framebuffer(info)<0) {
 476                 err = -EINVAL;
 477                 fb_dealloc_cmap(&info->cmap);
 478                 goto err;
 479         }
 480         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 481                info->node, info->fix.id);
 482         return 0;
 483 err:
 484         framebuffer_release(info);
 485         release_mem_region(vesafb_fix.smem_start, size_total);
 486         return err;
 487 }
 488
 489 static struct device_driver vesafb_driver = {
 490         .name   = "vesafb",
 491         .bus    = &platform_bus_type,
 492         .probe  = vesafb_probe,
 493 };
 494
 495 static struct platform_device vesafb_device = {
 496         .name   = "vesafb",
 497 };
 498
 499 static int __init vesafb_init(void)
 500 {
 501         int ret;
 502         char *option = NULL;
 503
 504         /* ignore error return of fb_get_options */
 505         fb_get_options("vesafb", &option);
 506         vesafb_setup(option);
 507         ret = driver_register(&vesafb_driver);
 508
 509         if (!ret) {
 510                 ret = platform_device_register(&vesafb_device);
 511                 if (ret)
 512                         driver_unregister(&vesafb_driver);
 513         }
 514         return ret;
 515 }
 516 module_init(vesafb_init);
 517
 518 MODULE_LICENSE("GPL");