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