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 #ifdef __i386__
  23 #include <video/edid.h>
  24 #endif
  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      = 1;
  52 static int             vram __initdata = 0; /* Set amount of memory to be used */
  53 static int             pmi_setpal = 0;  /* pmi for palette changes ??? */
  54 static int             ypan       = 0;  /* 0..nothing, 1..ypan, 2..ywrap */
  55 static unsigned short  *pmi_base  = 0;
  56 static void            (*pmi_start)(void);
  57 static void            (*pmi_pal)(void);
  58
  59 /* --------------------------------------------------------------------- */
  60
  61 static int vesafb_pan_display(struct fb_var_screeninfo *var,
  62                               struct fb_info *info)
  63 {
  64 #ifdef __i386__
  65         int offset;
  66
  67         if (!ypan)
  68                 return -EINVAL;
  69         if (var->xoffset)
  70                 return -EINVAL;
  71         if (var->yoffset > var->yres_virtual)
  72                 return -EINVAL;
  73         if ((ypan==1) && var->yoffset+var->yres > var->yres_virtual)
  74                 return -EINVAL;
  75
  76         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
  77
  78         __asm__ __volatile__(
  79                 "call *(%%edi)"
  80                 : /* no return value */
  81                 : "a" (0x4f07),         /* EAX */
  82                   "b" (0),              /* EBX */
  83                   "c" (offset),         /* ECX */
  84                   "d" (offset >> 16),   /* EDX */
  85                   "D" (&pmi_start));    /* EDI */
  86 #endif
  87         return 0;
  88 }
  89
  90 static void vesa_setpalette(int regno, unsigned red, unsigned green, unsigned blue)
  91 {
  92 #ifdef __i386__
  93         struct { u_char blue, green, red, pad; } entry;
  94
  95         if (pmi_setpal) {
  96                 entry.red   = red   >> 10;
  97                 entry.green = green >> 10;
  98                 entry.blue  = blue  >> 10;
  99                 entry.pad   = 0;
 100                 __asm__ __volatile__(
 101                 "call *(%%esi)"
 102                 : /* no return value */
 103                 : "a" (0x4f09),         /* EAX */
 104                   "b" (0),              /* EBX */
 105                   "c" (1),              /* ECX */
 106                   "d" (regno),          /* EDX */
 107                   "D" (&entry),         /* EDI */
 108                   "S" (&pmi_pal));      /* ESI */
 109         } else {
 110                 /* without protected mode interface, try VGA registers... */
 111                 outb_p(regno,       dac_reg);
 112                 outb_p(red   >> 10, dac_val);
 113                 outb_p(green >> 10, dac_val);
 114                 outb_p(blue  >> 10, dac_val);
 115         }
 116 #endif
 117 }
 118
 119 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 120                             unsigned blue, unsigned transp,
 121                             struct fb_info *info)
 122 {
 123         /*
 124          *  Set a single color register. The values supplied are
 125          *  already rounded down to the hardware's capabilities
 126          *  (according to the entries in the `var' structure). Return
 127          *  != 0 for invalid regno.
 128          */
 129
 130         if (regno >= info->cmap.len)
 131                 return 1;
 132
 133         switch (info->var.bits_per_pixel) {
 134         case 8:
 135                 vesa_setpalette(regno,red,green,blue);
 136                 break;
 137         case 16:
 138                 if (info->var.red.offset == 10) {
 139                         /* 1:5:5:5 */
 140                         ((u32*) (info->pseudo_palette))[regno] =
 141                                         ((red   & 0xf800) >>  1) |
 142                                         ((green & 0xf800) >>  6) |
 143                                         ((blue  & 0xf800) >> 11);
 144                 } else {
 145                         /* 0:5:6:5 */
 146                         ((u32*) (info->pseudo_palette))[regno] =
 147                                         ((red   & 0xf800)      ) |
 148                                         ((green & 0xfc00) >>  5) |
 149                                         ((blue  & 0xf800) >> 11);
 150                 }
 151                 break;
 152         case 24:
 153                 red   >>= 8;
 154                 green >>= 8;
 155                 blue  >>= 8;
 156                 ((u32 *)(info->pseudo_palette))[regno] =
 157                         (red   << info->var.red.offset)   |
 158                         (green << info->var.green.offset) |
 159                         (blue  << info->var.blue.offset);
 160                 break;
 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     return 0;
 172 }
 173
 174 static struct fb_ops vesafb_ops = {
 175         .owner          = THIS_MODULE,
 176         .fb_setcolreg   = vesafb_setcolreg,
 177         .fb_pan_display = vesafb_pan_display,
 178         .fb_fillrect    = cfb_fillrect,
 179         .fb_copyarea    = cfb_copyarea,
 180         .fb_imageblit   = cfb_imageblit,
 181         .fb_cursor      = soft_cursor,
 182 };
 183
 184 int __init vesafb_setup(char *options)
 185 {
 186         char *this_opt;
 187
 188         if (!options || !*options)
 189                 return 0;
 190
 191         while ((this_opt = strsep(&options, ",")) != NULL) {
 192                 if (!*this_opt) continue;
 193
 194                 if (! strcmp(this_opt, "inverse"))
 195                         inverse=1;
 196                 else if (! strcmp(this_opt, "redraw"))
 197                         ypan=0;
 198                 else if (! strcmp(this_opt, "ypan"))
 199                         ypan=1;
 200                 else if (! strcmp(this_opt, "ywrap"))
 201                         ypan=2;
 202                 else if (! strcmp(this_opt, "vgapal"))
 203                         pmi_setpal=0;
 204                 else if (! strcmp(this_opt, "pmipal"))
 205                         pmi_setpal=1;
 206                 else if (! strcmp(this_opt, "mtrr"))
 207                         mtrr=1;
 208                 else if (! strcmp(this_opt, "nomtrr"))
 209                         mtrr=0;
 210                 else if (! strncmp(this_opt, "vram:", 5))
 211                         vram = simple_strtoul(this_opt+5, NULL, 0);
 212         }
 213         return 0;
 214 }
 215
 216 static int __init vesafb_probe(struct device *device)
 217 {
 218         struct platform_device *dev = to_platform_device(device);
 219         struct fb_info *info;
 220         int i, err;
 221
 222         if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
 223                 return -ENXIO;
 224
 225         vesafb_fix.smem_start = screen_info.lfb_base;
 226         vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
 227         if (15 == vesafb_defined.bits_per_pixel)
 228                 vesafb_defined.bits_per_pixel = 16;
 229         vesafb_defined.xres = screen_info.lfb_width;
 230         vesafb_defined.yres = screen_info.lfb_height;
 231         vesafb_fix.line_length = screen_info.lfb_linelength;
 232
 233         /* Allocate enough memory for double buffering */
 234         vesafb_fix.smem_len = screen_info.lfb_width * screen_info.lfb_height * vesafb_defined.bits_per_pixel >> 2;
 235
 236         /* check that we don't remap more memory than old cards have */
 237         if (vesafb_fix.smem_len > (screen_info.lfb_size * 65536))
 238                 vesafb_fix.smem_len = screen_info.lfb_size * 65536;
 239
 240         /* Set video size according to vram boot option */
 241         if (vram)
 242                 vesafb_fix.smem_len = vram * 1024 * 1024;
 243
 244         vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
 245                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
 246
 247         /* limit framebuffer size to 16 MB.  Otherwise we'll eat tons of
 248          * kernel address space for nothing if the gfx card has alot of
 249          * memory (>= 128 MB isn't uncommon these days ...) */
 250         if (vesafb_fix.smem_len > 16 * 1024 * 1024)
 251                 vesafb_fix.smem_len = 16 * 1024 * 1024;
 252
 253 #ifndef __i386__
 254         screen_info.vesapm_seg = 0;
 255 #endif
 256
 257         if (!request_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len, "vesafb")) {
 258                 printk(KERN_WARNING
 259                        "vesafb: abort, cannot reserve video memory at 0x%lx\n",
 260                         vesafb_fix.smem_start);
 261                 /* We cannot make this fatal. Sometimes this comes from magic
 262                    spaces our resource handlers simply don't know about */
 263         }
 264
 265         info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
 266         if (!info) {
 267                 release_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len);
 268                 return -ENOMEM;
 269         }
 270         info->pseudo_palette = info->par;
 271         info->par = NULL;
 272
 273         info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
 274         if (!info->screen_base) {
 275                 printk(KERN_ERR
 276                        "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
 277                         vesafb_fix.smem_len, vesafb_fix.smem_start);
 278                 err = -EIO;
 279                 goto err;
 280         }
 281
 282         printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, size %dk\n",
 283                vesafb_fix.smem_start, info->screen_base, vesafb_fix.smem_len/1024);
 284         printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 285                vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
 286
 287         if (screen_info.vesapm_seg) {
 288                 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
 289                        screen_info.vesapm_seg,screen_info.vesapm_off);
 290         }
 291
 292         if (screen_info.vesapm_seg < 0xc000)
 293                 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
 294
 295         if (ypan || pmi_setpal) {
 296                 pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
 297                 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
 298                 pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
 299                 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
 300                 if (pmi_base[3]) {
 301                         printk(KERN_INFO "vesafb: pmi: ports = ");
 302                                 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
 303                                         printk("%x ",pmi_base[i]);
 304                         printk("\n");
 305                         if (pmi_base[i] != 0xffff) {
 306                                 /*
 307                                  * memory areas not supported (yet?)
 308                                  *
 309                                  * Rules are: we have to set up a descriptor for the requested
 310                                  * memory area and pass it in the ES register to the BIOS function.
 311                                  */
 312                                 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
 313                                 ypan = pmi_setpal = 0;
 314                         }
 315                 }
 316         }
 317
 318         vesafb_defined.xres_virtual = vesafb_defined.xres;
 319         vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
 320         if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
 321                 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
 322                        (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
 323         } else {
 324                 printk(KERN_INFO "vesafb: scrolling: redraw\n");
 325                 vesafb_defined.yres_virtual = vesafb_defined.yres;
 326                 ypan = 0;
 327         }
 328
 329         /* some dummy values for timing to make fbset happy */
 330         vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
 331         vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
 332         vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
 333
 334         if (vesafb_defined.bits_per_pixel > 8) {
 335                 vesafb_defined.red.offset    = screen_info.red_pos;
 336                 vesafb_defined.red.length    = screen_info.red_size;
 337                 vesafb_defined.green.offset  = screen_info.green_pos;
 338                 vesafb_defined.green.length  = screen_info.green_size;
 339                 vesafb_defined.blue.offset   = screen_info.blue_pos;
 340                 vesafb_defined.blue.length   = screen_info.blue_size;
 341                 vesafb_defined.transp.offset = screen_info.rsvd_pos;
 342                 vesafb_defined.transp.length = screen_info.rsvd_size;
 343                 printk(KERN_INFO "vesafb: directcolor: "
 344                        "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 345                        screen_info.rsvd_size,
 346                        screen_info.red_size,
 347                        screen_info.green_size,
 348                        screen_info.blue_size,
 349                        screen_info.rsvd_pos,
 350                        screen_info.red_pos,
 351                        screen_info.green_pos,
 352                        screen_info.blue_pos);
 353         } else {
 354                 vesafb_defined.red.length   = 6;
 355                 vesafb_defined.green.length = 6;
 356                 vesafb_defined.blue.length  = 6;
 357         }
 358
 359         vesafb_fix.ypanstep  = ypan     ? 1 : 0;
 360         vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
 361
 362         /* request failure does not faze us, as vgacon probably has this
 363          * region already (FIXME) */
 364         request_region(0x3c0, 32, "vesafb");
 365
 366         if (mtrr) {
 367                 int temp_size = vesafb_fix.smem_len;
 368                 /* Find the largest power-of-two */
 369                 while (temp_size & (temp_size - 1))
 370                         temp_size &= (temp_size - 1);
 371
 372                 /* Try and find a power of two to add */
 373                 while (temp_size && mtrr_add(vesafb_fix.smem_start, temp_size, MTRR_TYPE_WRCOMB, 1)==-EINVAL) {
 374                         temp_size >>= 1;
 375                 }
 376         }
 377
 378         info->fbops = &vesafb_ops;
 379         info->var = vesafb_defined;
 380         info->fix = vesafb_fix;
 381         info->flags = FBINFO_FLAG_DEFAULT;
 382
 383         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 384                 err = -ENXIO;
 385                 goto err;
 386         }
 387         if (register_framebuffer(info)<0) {
 388                 err = -EINVAL;
 389                 fb_dealloc_cmap(&info->cmap);
 390                 goto err;
 391         }
 392         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 393                info->node, info->fix.id);
 394         return 0;
 395 err:
 396         framebuffer_release(info);
 397         release_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len);
 398         return err;
 399 }
 400
 401 static struct device_driver vesafb_driver = {
 402         .name   = "vesafb",
 403         .bus    = &platform_bus_type,
 404         .probe  = vesafb_probe,
 405 };
 406
 407 static struct platform_device vesafb_device = {
 408         .name   = "vesafb",
 409 };
 410
 411 int __init vesafb_init(void)
 412 {
 413         int ret;
 414
 415         ret = driver_register(&vesafb_driver);
 416
 417         if (!ret) {
 418                 ret = platform_device_register(&vesafb_device);
 419                 if (ret)
 420                         driver_unregister(&vesafb_driver);
 421         }
 422         return ret;
 423 }
 424
 425 /*
 426  * Overrides for Emacs so that we follow Linus's tabbing style.
 427  * ---------------------------------------------------------------------------
 428  * Local variables:
 429  * c-basic-offset: 8
 430  * End:
 431  */
 432
 433 MODULE_LICENSE("GPL");