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