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 struct fb_info fb_info;
  51 static u32 pseudo_palette[17];
  52
  53 static int             inverse   = 0;
  54 static int             mtrr      = 1;
  55
  56 static int             pmi_setpal = 0;  /* pmi for palette changes ??? */
  57 static int             ypan       = 0;  /* 0..nothing, 1..ypan, 2..ywrap */
  58 static unsigned short  *pmi_base  = 0;
  59 static void            (*pmi_start)(void);
  60 static void            (*pmi_pal)(void);
  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 void vesa_setpalette(int regno, unsigned red, unsigned green, unsigned blue)
  94 {
  95 #ifdef __i386__
  96         struct { u_char blue, green, red, pad; } entry;
  97
  98         if (pmi_setpal) {
  99                 entry.red   = red   >> 10;
 100                 entry.green = green >> 10;
 101                 entry.blue  = blue  >> 10;
 102                 entry.pad   = 0;
 103                 __asm__ __volatile__(
 104                 "call *(%%esi)"
 105                 : /* no return value */
 106                 : "a" (0x4f09),         /* EAX */
 107                   "b" (0),              /* EBX */
 108                   "c" (1),              /* ECX */
 109                   "d" (regno),          /* EDX */
 110                   "D" (&entry),         /* EDI */
 111                   "S" (&pmi_pal));      /* ESI */
 112         } else {
 113                 /* without protected mode interface, try VGA registers... */
 114                 outb_p(regno,       dac_reg);
 115                 outb_p(red   >> 10, dac_val);
 116                 outb_p(green >> 10, dac_val);
 117                 outb_p(blue  >> 10, dac_val);
 118         }
 119 #endif
 120 }
 121
 122 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 123                             unsigned blue, unsigned transp,
 124                             struct fb_info *info)
 125 {
 126         /*
 127          *  Set a single color register. The values supplied are
 128          *  already rounded down to the hardware's capabilities
 129          *  (according to the entries in the `var' structure). Return
 130          *  != 0 for invalid regno.
 131          */
 132
 133         if (regno >= info->cmap.len)
 134                 return 1;
 135
 136         switch (info->var.bits_per_pixel) {
 137         case 8:
 138                 vesa_setpalette(regno,red,green,blue);
 139                 break;
 140         case 16:
 141                 if (info->var.red.offset == 10) {
 142                         /* 1:5:5:5 */
 143                         ((u32*) (info->pseudo_palette))[regno] =
 144                                         ((red   & 0xf800) >>  1) |
 145                                         ((green & 0xf800) >>  6) |
 146                                         ((blue  & 0xf800) >> 11);
 147                 } else {
 148                         /* 0:5:6:5 */
 149                         ((u32*) (info->pseudo_palette))[regno] =
 150                                         ((red   & 0xf800)      ) |
 151                                         ((green & 0xfc00) >>  5) |
 152                                         ((blue  & 0xf800) >> 11);
 153                 }
 154                 break;
 155         case 24:
 156                 red   >>= 8;
 157                 green >>= 8;
 158                 blue  >>= 8;
 159                 ((u32 *)(info->pseudo_palette))[regno] =
 160                         (red   << info->var.red.offset)   |
 161                         (green << info->var.green.offset) |
 162                         (blue  << info->var.blue.offset);
 163                 break;
 164         case 32:
 165                 red   >>= 8;
 166                 green >>= 8;
 167                 blue  >>= 8;
 168                 ((u32 *)(info->pseudo_palette))[regno] =
 169                         (red   << info->var.red.offset)   |
 170                         (green << info->var.green.offset) |
 171                         (blue  << info->var.blue.offset);
 172                 break;
 173     }
 174     return 0;
 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         .fb_cursor      = soft_cursor,
 185 };
 186
 187 int __init vesafb_setup(char *options)
 188 {
 189         char *this_opt;
 190
 191         if (!options || !*options)
 192                 return 0;
 193
 194         while ((this_opt = strsep(&options, ",")) != NULL) {
 195                 if (!*this_opt) continue;
 196
 197                 if (! strcmp(this_opt, "inverse"))
 198                         inverse=1;
 199                 else if (! strcmp(this_opt, "redraw"))
 200                         ypan=0;
 201                 else if (! strcmp(this_opt, "ypan"))
 202                         ypan=1;
 203                 else if (! strcmp(this_opt, "ywrap"))
 204                         ypan=2;
 205                 else if (! strcmp(this_opt, "vgapal"))
 206                         pmi_setpal=0;
 207                 else if (! strcmp(this_opt, "pmipal"))
 208                         pmi_setpal=1;
 209                 else if (! strcmp(this_opt, "mtrr"))
 210                         mtrr=1;
 211                 else if (! strcmp(this_opt, "nomtrr"))
 212                         mtrr=0;
 213         }
 214         return 0;
 215 }
 216
 217 int __init vesafb_init(void)
 218 {
 219         int video_cmap_len;
 220         int i;
 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         vesafb_fix.smem_len = screen_info.lfb_size * 65536;
 233         vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
 234                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
 235
 236         /* limit framebuffer size to 16 MB.  Otherwise we'll eat tons of
 237          * kernel address space for nothing if the gfx card has alot of
 238          * memory (>= 128 MB isn't uncommon these days ...) */
 239         if (vesafb_fix.smem_len > 16 * 1024 * 1024)
 240                 vesafb_fix.smem_len = 16 * 1024 * 1024;
 241
 242 #ifndef __i386__
 243         screen_info.vesapm_seg = 0;
 244 #endif
 245
 246         if (!request_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len, "vesafb")) {
 247                 printk(KERN_WARNING
 248                        "vesafb: abort, cannot reserve video memory at 0x%lx\n",
 249                         vesafb_fix.smem_start);
 250                 /* We cannot make this fatal. Sometimes this comes from magic
 251                    spaces our resource handlers simply don't know about */
 252         }
 253
 254         fb_info.screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
 255         if (!fb_info.screen_base) {
 256                 release_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len);
 257                 printk(KERN_ERR
 258                        "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
 259                         vesafb_fix.smem_len, vesafb_fix.smem_start);
 260                 return -EIO;
 261         }
 262
 263         printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, size %dk\n",
 264                vesafb_fix.smem_start, fb_info.screen_base, vesafb_fix.smem_len/1024);
 265         printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 266                vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
 267
 268         if (screen_info.vesapm_seg) {
 269                 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
 270                        screen_info.vesapm_seg,screen_info.vesapm_off);
 271         }
 272
 273         if (screen_info.vesapm_seg < 0xc000)
 274                 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
 275
 276         if (ypan || pmi_setpal) {
 277                 pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
 278                 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
 279                 pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
 280                 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
 281                 if (pmi_base[3]) {
 282                         printk(KERN_INFO "vesafb: pmi: ports = ");
 283                                 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
 284                                         printk("%x ",pmi_base[i]);
 285                         printk("\n");
 286                         if (pmi_base[i] != 0xffff) {
 287                                 /*
 288                                  * memory areas not supported (yet?)
 289                                  *
 290                                  * Rules are: we have to set up a descriptor for the requested
 291                                  * memory area and pass it in the ES register to the BIOS function.
 292                                  */
 293                                 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
 294                                 ypan = pmi_setpal = 0;
 295                         }
 296                 }
 297         }
 298
 299         vesafb_defined.xres_virtual = vesafb_defined.xres;
 300         vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
 301         if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
 302                 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
 303                        (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
 304         } else {
 305                 printk(KERN_INFO "vesafb: scrolling: redraw\n");
 306                 vesafb_defined.yres_virtual = vesafb_defined.yres;
 307                 ypan = 0;
 308         }
 309
 310         /* some dummy values for timing to make fbset happy */
 311         vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
 312         vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
 313         vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
 314
 315         if (vesafb_defined.bits_per_pixel > 8) {
 316                 vesafb_defined.red.offset    = screen_info.red_pos;
 317                 vesafb_defined.red.length    = screen_info.red_size;
 318                 vesafb_defined.green.offset  = screen_info.green_pos;
 319                 vesafb_defined.green.length  = screen_info.green_size;
 320                 vesafb_defined.blue.offset   = screen_info.blue_pos;
 321                 vesafb_defined.blue.length   = screen_info.blue_size;
 322                 vesafb_defined.transp.offset = screen_info.rsvd_pos;
 323                 vesafb_defined.transp.length = screen_info.rsvd_size;
 324                 printk(KERN_INFO "vesafb: directcolor: "
 325                        "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 326                        screen_info.rsvd_size,
 327                        screen_info.red_size,
 328                        screen_info.green_size,
 329                        screen_info.blue_size,
 330                        screen_info.rsvd_pos,
 331                        screen_info.red_pos,
 332                        screen_info.green_pos,
 333                        screen_info.blue_pos);
 334                 video_cmap_len = 16;
 335         } else {
 336                 vesafb_defined.red.length   = 6;
 337                 vesafb_defined.green.length = 6;
 338                 vesafb_defined.blue.length  = 6;
 339                 video_cmap_len = 256;
 340         }
 341
 342         vesafb_fix.ypanstep  = ypan     ? 1 : 0;
 343         vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
 344
 345         /* request failure does not faze us, as vgacon probably has this
 346          * region already (FIXME) */
 347         request_region(0x3c0, 32, "vesafb");
 348
 349         if (mtrr) {
 350                 int temp_size = vesafb_fix.smem_len;
 351                 /* Find the largest power-of-two */
 352                 while (temp_size & (temp_size - 1))
 353                         temp_size &= (temp_size - 1);
 354
 355                 /* Try and find a power of two to add */
 356                 while (temp_size && mtrr_add(vesafb_fix.smem_start, temp_size, MTRR_TYPE_WRCOMB, 1)==-EINVAL) {
 357                         temp_size >>= 1;
 358                 }
 359         }
 360
 361         fb_info.fbops = &vesafb_ops;
 362         fb_info.var = vesafb_defined;
 363         fb_info.fix = vesafb_fix;
 364         fb_info.pseudo_palette = pseudo_palette;
 365         fb_info.flags = FBINFO_FLAG_DEFAULT;
 366
 367         fb_alloc_cmap(&fb_info.cmap, video_cmap_len, 0);
 368
 369         if (register_framebuffer(&fb_info)<0)
 370                 return -EINVAL;
 371
 372         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 373                fb_info.node, fb_info.fix.id);
 374         return 0;
 375 }
 376
 377 /*
 378  * Overrides for Emacs so that we follow Linus's tabbing style.
 379  * ---------------------------------------------------------------------------
 380  * Local variables:
 381  * c-basic-offset: 8
 382  * End:
 383  */
 384
 385 MODULE_LICENSE("GPL");