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  = NULL;
  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,
  91                             unsigned blue, struct fb_var_screeninfo *var)
  92 {
  93 #ifdef __i386__
  94         struct { u_char blue, green, red, pad; } entry;
  95         int shift = 16 - var->green.length;
  96
  97         if (pmi_setpal) {
  98                 entry.red   = red   >> shift;
  99                 entry.green = green >> shift;
 100                 entry.blue  = blue  >> shift;
 101                 entry.pad   = 0;
 102                 __asm__ __volatile__(
 103                 "call *(%%esi)"
 104                 : /* no return value */
 105                 : "a" (0x4f09),         /* EAX */
 106                   "b" (0),              /* EBX */
 107                   "c" (1),              /* ECX */
 108                   "d" (regno),          /* EDX */
 109                   "D" (&entry),         /* EDI */
 110                   "S" (&pmi_pal));      /* ESI */
 111         } else {
 112                 /* without protected mode interface, try VGA registers... */
 113                 outb_p(regno,       dac_reg);
 114                 outb_p(red   >> shift, dac_val);
 115                 outb_p(green >> shift, dac_val);
 116                 outb_p(blue  >> shift, dac_val);
 117         }
 118 #endif
 119 }
 120
 121 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 122                             unsigned blue, unsigned transp,
 123                             struct fb_info *info)
 124 {
 125         /*
 126          *  Set a single color register. The values supplied are
 127          *  already rounded down to the hardware's capabilities
 128          *  (according to the entries in the `var' structure). Return
 129          *  != 0 for invalid regno.
 130          */
 131
 132         if (regno >= info->cmap.len)
 133                 return 1;
 134
 135         switch (info->var.bits_per_pixel) {
 136         case 8:
 137                 vesa_setpalette(regno,red,green,blue, &info->var);
 138                 break;
 139         case 16:
 140                 if (info->var.red.offset == 10) {
 141                         /* 1:5:5:5 */
 142                         ((u32*) (info->pseudo_palette))[regno] =
 143                                         ((red   & 0xf800) >>  1) |
 144                                         ((green & 0xf800) >>  6) |
 145                                         ((blue  & 0xf800) >> 11);
 146                 } else {
 147                         /* 0:5:6:5 */
 148                         ((u32*) (info->pseudo_palette))[regno] =
 149                                         ((red   & 0xf800)      ) |
 150                                         ((green & 0xfc00) >>  5) |
 151                                         ((blue  & 0xf800) >> 11);
 152                 }
 153                 break;
 154         case 24:
 155                 red   >>= 8;
 156                 green >>= 8;
 157                 blue  >>= 8;
 158                 ((u32 *)(info->pseudo_palette))[regno] =
 159                         (red   << info->var.red.offset)   |
 160                         (green << info->var.green.offset) |
 161                         (blue  << info->var.blue.offset);
 162                 break;
 163         case 32:
 164                 red   >>= 8;
 165                 green >>= 8;
 166                 blue  >>= 8;
 167                 ((u32 *)(info->pseudo_palette))[regno] =
 168                         (red   << info->var.red.offset)   |
 169                         (green << info->var.green.offset) |
 170                         (blue  << info->var.blue.offset);
 171                 break;
 172     }
 173     return 0;
 174 }
 175
 176 static struct fb_ops vesafb_ops = {
 177         .owner          = THIS_MODULE,
 178         .fb_setcolreg   = vesafb_setcolreg,
 179         .fb_pan_display = vesafb_pan_display,
 180         .fb_fillrect    = cfb_fillrect,
 181         .fb_copyarea    = cfb_copyarea,
 182         .fb_imageblit   = cfb_imageblit,
 183         .fb_cursor      = soft_cursor,
 184 };
 185
 186 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 (! strcmp(this_opt, "mtrr"))
 209                         mtrr=1;
 210                 else if (! strcmp(this_opt, "nomtrr"))
 211                         mtrr=0;
 212                 else if (! strncmp(this_opt, "vram:", 5))
 213                         vram = simple_strtoul(this_opt+5, NULL, 0);
 214         }
 215         return 0;
 216 }
 217
 218 static int __init vesafb_probe(struct device *device)
 219 {
 220         struct platform_device *dev = to_platform_device(device);
 221         struct fb_info *info;
 222         int i, err;
 223
 224         if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
 225                 return -ENXIO;
 226
 227         vesafb_fix.smem_start = screen_info.lfb_base;
 228         vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
 229         if (15 == vesafb_defined.bits_per_pixel)
 230                 vesafb_defined.bits_per_pixel = 16;
 231         vesafb_defined.xres = screen_info.lfb_width;
 232         vesafb_defined.yres = screen_info.lfb_height;
 233         vesafb_fix.line_length = screen_info.lfb_linelength;
 234
 235         /* Allocate enough memory for double buffering */
 236         vesafb_fix.smem_len = screen_info.lfb_width * screen_info.lfb_height * vesafb_defined.bits_per_pixel >> 2;
 237
 238         /* check that we don't remap more memory than old cards have */
 239         if (vesafb_fix.smem_len > (screen_info.lfb_size * 65536))
 240                 vesafb_fix.smem_len = screen_info.lfb_size * 65536;
 241
 242         /* Set video size according to vram boot option */
 243         if (vram)
 244                 vesafb_fix.smem_len = vram * 1024 * 1024;
 245
 246         vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
 247                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
 248
 249         /* limit framebuffer size to 16 MB.  Otherwise we'll eat tons of
 250          * kernel address space for nothing if the gfx card has alot of
 251          * memory (>= 128 MB isn't uncommon these days ...) */
 252         if (vesafb_fix.smem_len > 16 * 1024 * 1024)
 253                 vesafb_fix.smem_len = 16 * 1024 * 1024;
 254
 255 #ifndef __i386__
 256         screen_info.vesapm_seg = 0;
 257 #endif
 258
 259         if (!request_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len, "vesafb")) {
 260                 printk(KERN_WARNING
 261                        "vesafb: abort, cannot reserve video memory at 0x%lx\n",
 262                         vesafb_fix.smem_start);
 263                 /* We cannot make this fatal. Sometimes this comes from magic
 264                    spaces our resource handlers simply don't know about */
 265         }
 266
 267         info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
 268         if (!info) {
 269                 release_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len);
 270                 return -ENOMEM;
 271         }
 272         info->pseudo_palette = info->par;
 273         info->par = NULL;
 274
 275         info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
 276         if (!info->screen_base) {
 277                 printk(KERN_ERR
 278                        "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
 279                         vesafb_fix.smem_len, vesafb_fix.smem_start);
 280                 err = -EIO;
 281                 goto err;
 282         }
 283
 284         printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, size %dk\n",
 285                vesafb_fix.smem_start, info->screen_base, vesafb_fix.smem_len/1024);
 286         printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 287                vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
 288
 289         if (screen_info.vesapm_seg) {
 290                 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
 291                        screen_info.vesapm_seg,screen_info.vesapm_off);
 292         }
 293
 294         if (screen_info.vesapm_seg < 0xc000)
 295                 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
 296
 297         if (ypan || pmi_setpal) {
 298                 pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
 299                 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
 300                 pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
 301                 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
 302                 if (pmi_base[3]) {
 303                         printk(KERN_INFO "vesafb: pmi: ports = ");
 304                                 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
 305                                         printk("%x ",pmi_base[i]);
 306                         printk("\n");
 307                         if (pmi_base[i] != 0xffff) {
 308                                 /*
 309                                  * memory areas not supported (yet?)
 310                                  *
 311                                  * Rules are: we have to set up a descriptor for the requested
 312                                  * memory area and pass it in the ES register to the BIOS function.
 313                                  */
 314                                 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
 315                                 ypan = pmi_setpal = 0;
 316                         }
 317                 }
 318         }
 319
 320         vesafb_defined.xres_virtual = vesafb_defined.xres;
 321         vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
 322         if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
 323                 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
 324                        (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
 325         } else {
 326                 printk(KERN_INFO "vesafb: scrolling: redraw\n");
 327                 vesafb_defined.yres_virtual = vesafb_defined.yres;
 328                 ypan = 0;
 329         }
 330
 331         /* some dummy values for timing to make fbset happy */
 332         vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
 333         vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
 334         vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
 335
 336         vesafb_defined.red.offset    = screen_info.red_pos;
 337         vesafb_defined.red.length    = screen_info.red_size;
 338         vesafb_defined.green.offset  = screen_info.green_pos;
 339         vesafb_defined.green.length  = screen_info.green_size;
 340         vesafb_defined.blue.offset   = screen_info.blue_pos;
 341         vesafb_defined.blue.length   = screen_info.blue_size;
 342         vesafb_defined.transp.offset = screen_info.rsvd_pos;
 343         vesafb_defined.transp.length = screen_info.rsvd_size;
 344         printk(KERN_INFO "vesafb: %s: "
 345                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 346                (vesafb_defined.bits_per_pixel > 8) ?
 347                "Truecolor" : "Pseudocolor",
 348                screen_info.rsvd_size,
 349                screen_info.red_size,
 350                screen_info.green_size,
 351                screen_info.blue_size,
 352                screen_info.rsvd_pos,
 353                screen_info.red_pos,
 354                screen_info.green_pos,
 355                screen_info.blue_pos);
 356
 357         vesafb_fix.ypanstep  = ypan     ? 1 : 0;
 358         vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
 359
 360         /* request failure does not faze us, as vgacon probably has this
 361          * region already (FIXME) */
 362         request_region(0x3c0, 32, "vesafb");
 363
 364         if (mtrr) {
 365                 int temp_size = vesafb_fix.smem_len;
 366                 /* Find the largest power-of-two */
 367                 while (temp_size & (temp_size - 1))
 368                         temp_size &= (temp_size - 1);
 369
 370                 /* Try and find a power of two to add */
 371                 while (temp_size && mtrr_add(vesafb_fix.smem_start, temp_size, MTRR_TYPE_WRCOMB, 1)==-EINVAL) {
 372                         temp_size >>= 1;
 373                 }
 374         }
 375
 376         info->fbops = &vesafb_ops;
 377         info->var = vesafb_defined;
 378         info->fix = vesafb_fix;
 379         info->flags = FBINFO_FLAG_DEFAULT |
 380                 (ypan) ? FBINFO_HWACCEL_YPAN : 0;
 381
 382         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 383                 err = -ENXIO;
 384                 goto err;
 385         }
 386         if (register_framebuffer(info)<0) {
 387                 err = -EINVAL;
 388                 fb_dealloc_cmap(&info->cmap);
 389                 goto err;
 390         }
 391         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 392                info->node, info->fix.id);
 393         return 0;
 394 err:
 395         framebuffer_release(info);
 396         release_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len);
 397         return err;
 398 }
 399
 400 static struct device_driver vesafb_driver = {
 401         .name   = "vesafb",
 402         .bus    = &platform_bus_type,
 403         .probe  = vesafb_probe,
 404 };
 405
 406 static struct platform_device vesafb_device = {
 407         .name   = "vesafb",
 408 };
 409
 410 int __init vesafb_init(void)
 411 {
 412         int ret;
 413         char *option = NULL;
 414
 415         /* ignore error return of fb_get_options */
 416         fb_get_options("vesafb", &option);
 417         vesafb_setup(option);
 418         ret = driver_register(&vesafb_driver);
 419
 420         if (!ret) {
 421                 ret = platform_device_register(&vesafb_device);
 422                 if (ret)
 423                         driver_unregister(&vesafb_driver);
 424         }
 425         return ret;
 426 }
 427 module_init(vesafb_init);
 428
 429 /*
 430  * Overrides for Emacs so that we follow Linus's tabbing style.
 431  * ---------------------------------------------------------------------------
 432  * Local variables:
 433  * c-basic-offset: 8
 434  * End:
 435  */
 436
 437 MODULE_LICENSE("GPL");