drivers/video/fbdev/vesafb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * framebuffer driver for VBE 2.0 compliant graphic boards
   4  *
   5  * switching to graphics mode happens at boot time (while
   6  * running in real mode, see arch/i386/boot/video.S).
   7  *
   8  * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
   9  *
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/errno.h>
  15 #include <linux/string.h>
  16 #include <linux/mm.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 #include <linux/io.h>
  24
  25 #include <video/vga.h>
  26
  27 #define dac_reg (0x3c8)
  28 #define dac_val (0x3c9)
  29
  30 /* --------------------------------------------------------------------- */
  31
  32 struct vesafb_par {
  33         u32 pseudo_palette[256];
  34         int wc_cookie;
  35 };
  36
  37 static struct fb_var_screeninfo vesafb_defined = {
  38         .activate       = FB_ACTIVATE_NOW,
  39         .height         = -1,
  40         .width          = -1,
  41         .right_margin   = 32,
  42         .upper_margin   = 16,
  43         .lower_margin   = 4,
  44         .vsync_len      = 4,
  45         .vmode          = FB_VMODE_NONINTERLACED,
  46 };
  47
  48 static struct fb_fix_screeninfo vesafb_fix = {
  49         .id     = "VESA VGA",
  50         .type   = FB_TYPE_PACKED_PIXELS,
  51         .accel  = FB_ACCEL_NONE,
  52 };
  53
  54 static int   inverse    __read_mostly;
  55 static int   mtrr       __read_mostly;          /* disable mtrr */
  56 static int   vram_remap;                        /* Set amount of memory to be used */
  57 static int   vram_total;                        /* Set total amount of memory */
  58 static int   pmi_setpal __read_mostly = 1;      /* pmi for palette changes ??? */
  59 static int   ypan       __read_mostly;          /* 0..nothing, 1..ypan, 2..ywrap */
  60 static void  (*pmi_start)(void) __read_mostly;
  61 static void  (*pmi_pal)  (void) __read_mostly;
  62 static int   depth      __read_mostly;
  63 static int   vga_compat __read_mostly;
  64 /* --------------------------------------------------------------------- */
  65
  66 static int vesafb_pan_display(struct fb_var_screeninfo *var,
  67                               struct fb_info *info)
  68 {
  69 #ifdef __i386__
  70         int offset;
  71
  72         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
  73
  74         __asm__ __volatile__(
  75                 "call *(%%edi)"
  76                 : /* no return value */
  77                 : "a" (0x4f07),         /* EAX */
  78                   "b" (0),              /* EBX */
  79                   "c" (offset),         /* ECX */
  80                   "d" (offset >> 16),   /* EDX */
  81                   "D" (&pmi_start));    /* EDI */
  82 #endif
  83         return 0;
  84 }
  85
  86 static int vesa_setpalette(int regno, unsigned red, unsigned green,
  87                             unsigned blue)
  88 {
  89         int shift = 16 - depth;
  90         int err = -EINVAL;
  91
  92 /*
  93  * Try VGA registers first...
  94  */
  95         if (vga_compat) {
  96                 outb_p(regno,       dac_reg);
  97                 outb_p(red   >> shift, dac_val);
  98                 outb_p(green >> shift, dac_val);
  99                 outb_p(blue  >> shift, dac_val);
 100                 err = 0;
 101         }
 102
 103 #ifdef __i386__
 104 /*
 105  * Fallback to the PMI....
 106  */
 107         if (err && pmi_setpal) {
 108                 struct { u_char blue, green, red, pad; } entry;
 109
 110                 entry.red   = red   >> shift;
 111                 entry.green = green >> shift;
 112                 entry.blue  = blue  >> shift;
 113                 entry.pad   = 0;
 114                 __asm__ __volatile__(
 115                 "call *(%%esi)"
 116                 : /* no return value */
 117                 : "a" (0x4f09),         /* EAX */
 118                   "b" (0),              /* EBX */
 119                   "c" (1),              /* ECX */
 120                   "d" (regno),          /* EDX */
 121                   "D" (&entry),         /* EDI */
 122                   "S" (&pmi_pal));      /* ESI */
 123                 err = 0;
 124         }
 125 #endif
 126
 127         return err;
 128 }
 129
 130 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 131                             unsigned blue, unsigned transp,
 132                             struct fb_info *info)
 133 {
 134         int err = 0;
 135
 136         /*
 137          *  Set a single color register. The values supplied are
 138          *  already rounded down to the hardware's capabilities
 139          *  (according to the entries in the `var' structure). Return
 140          *  != 0 for invalid regno.
 141          */
 142
 143         if (regno >= info->cmap.len)
 144                 return 1;
 145
 146         if (info->var.bits_per_pixel == 8)
 147                 err = vesa_setpalette(regno,red,green,blue);
 148         else if (regno < 16) {
 149                 switch (info->var.bits_per_pixel) {
 150                 case 16:
 151                         if (info->var.red.offset == 10) {
 152                                 /* 1:5:5:5 */
 153                                 ((u32*) (info->pseudo_palette))[regno] =
 154                                         ((red   & 0xf800) >>  1) |
 155                                         ((green & 0xf800) >>  6) |
 156                                         ((blue  & 0xf800) >> 11);
 157                         } else {
 158                                 /* 0:5:6:5 */
 159                                 ((u32*) (info->pseudo_palette))[regno] =
 160                                         ((red   & 0xf800)      ) |
 161                                         ((green & 0xfc00) >>  5) |
 162                                         ((blue  & 0xf800) >> 11);
 163                         }
 164                         break;
 165                 case 24:
 166                 case 32:
 167                         red   >>= 8;
 168                         green >>= 8;
 169                         blue  >>= 8;
 170                         ((u32 *)(info->pseudo_palette))[regno] =
 171                                 (red   << info->var.red.offset)   |
 172                                 (green << info->var.green.offset) |
 173                                 (blue  << info->var.blue.offset);
 174                         break;
 175                 }
 176         }
 177
 178         return err;
 179 }
 180
 181 static void vesafb_destroy(struct fb_info *info)
 182 {
 183         struct vesafb_par *par = info->par;
 184
 185         fb_dealloc_cmap(&info->cmap);
 186         arch_phys_wc_del(par->wc_cookie);
 187         if (info->screen_base)
 188                 iounmap(info->screen_base);
 189         release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
 190 }
 191
 192 static struct fb_ops vesafb_ops = {
 193         .owner          = THIS_MODULE,
 194         .fb_destroy     = vesafb_destroy,
 195         .fb_setcolreg   = vesafb_setcolreg,
 196         .fb_pan_display = vesafb_pan_display,
 197         .fb_fillrect    = cfb_fillrect,
 198         .fb_copyarea    = cfb_copyarea,
 199         .fb_imageblit   = cfb_imageblit,
 200 };
 201
 202 static int vesafb_setup(char *options)
 203 {
 204         char *this_opt;
 205
 206         if (!options || !*options)
 207                 return 0;
 208
 209         while ((this_opt = strsep(&options, ",")) != NULL) {
 210                 if (!*this_opt) continue;
 211
 212                 if (! strcmp(this_opt, "inverse"))
 213                         inverse=1;
 214                 else if (! strcmp(this_opt, "redraw"))
 215                         ypan=0;
 216                 else if (! strcmp(this_opt, "ypan"))
 217                         ypan=1;
 218                 else if (! strcmp(this_opt, "ywrap"))
 219                         ypan=2;
 220                 else if (! strcmp(this_opt, "vgapal"))
 221                         pmi_setpal=0;
 222                 else if (! strcmp(this_opt, "pmipal"))
 223                         pmi_setpal=1;
 224                 else if (! strncmp(this_opt, "mtrr:", 5))
 225                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
 226                 else if (! strcmp(this_opt, "nomtrr"))
 227                         mtrr=0;
 228                 else if (! strncmp(this_opt, "vtotal:", 7))
 229                         vram_total = simple_strtoul(this_opt+7, NULL, 0);
 230                 else if (! strncmp(this_opt, "vremap:", 7))
 231                         vram_remap = simple_strtoul(this_opt+7, NULL, 0);
 232         }
 233         return 0;
 234 }
 235
 236 static int vesafb_probe(struct platform_device *dev)
 237 {
 238         struct fb_info *info;
 239         struct vesafb_par *par;
 240         int i, err;
 241         unsigned int size_vmode;
 242         unsigned int size_remap;
 243         unsigned int size_total;
 244         char *option = NULL;
 245
 246         /* ignore error return of fb_get_options */
 247         fb_get_options("vesafb", &option);
 248         vesafb_setup(option);
 249
 250         if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
 251                 return -ENODEV;
 252
 253         vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
 254         vesafb_fix.smem_start = screen_info.lfb_base;
 255         vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
 256         if (15 == vesafb_defined.bits_per_pixel)
 257                 vesafb_defined.bits_per_pixel = 16;
 258         vesafb_defined.xres = screen_info.lfb_width;
 259         vesafb_defined.yres = screen_info.lfb_height;
 260         vesafb_fix.line_length = screen_info.lfb_linelength;
 261         vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
 262                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
 263
 264         /*   size_vmode -- that is the amount of memory needed for the
 265          *                 used video mode, i.e. the minimum amount of
 266          *                 memory we need. */
 267         size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
 268
 269         /*   size_total -- all video memory we have. Used for mtrr
 270          *                 entries, resource allocation and bounds
 271          *                 checking. */
 272         size_total = screen_info.lfb_size * 65536;
 273         if (vram_total)
 274                 size_total = vram_total * 1024 * 1024;
 275         if (size_total < size_vmode)
 276                 size_total = size_vmode;
 277
 278         /*   size_remap -- the amount of video memory we are going to
 279          *                 use for vesafb.  With modern cards it is no
 280          *                 option to simply use size_total as that
 281          *                 wastes plenty of kernel address space. */
 282         size_remap  = size_vmode * 2;
 283         if (vram_remap)
 284                 size_remap = vram_remap * 1024 * 1024;
 285         if (size_remap < size_vmode)
 286                 size_remap = size_vmode;
 287         if (size_remap > size_total)
 288                 size_remap = size_total;
 289         vesafb_fix.smem_len = size_remap;
 290
 291 #ifndef __i386__
 292         screen_info.vesapm_seg = 0;
 293 #endif
 294
 295         if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
 296                 printk(KERN_WARNING
 297                        "vesafb: cannot reserve video memory at 0x%lx\n",
 298                         vesafb_fix.smem_start);
 299                 /* We cannot make this fatal. Sometimes this comes from magic
 300                    spaces our resource handlers simply don't know about */
 301         }
 302
 303         info = framebuffer_alloc(sizeof(struct vesafb_par), &dev->dev);
 304         if (!info) {
 305                 release_mem_region(vesafb_fix.smem_start, size_total);
 306                 return -ENOMEM;
 307         }
 308         platform_set_drvdata(dev, info);
 309         par = info->par;
 310         info->pseudo_palette = par->pseudo_palette;
 311
 312         /* set vesafb aperture size for generic probing */
 313         info->apertures = alloc_apertures(1);
 314         if (!info->apertures) {
 315                 err = -ENOMEM;
 316                 goto err;
 317         }
 318         info->apertures->ranges[0].base = screen_info.lfb_base;
 319         info->apertures->ranges[0].size = size_total;
 320
 321         printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 322                vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
 323
 324         if (screen_info.vesapm_seg) {
 325                 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
 326                        screen_info.vesapm_seg,screen_info.vesapm_off);
 327         }
 328
 329         if (screen_info.vesapm_seg < 0xc000)
 330                 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
 331
 332         if (ypan || pmi_setpal) {
 333                 unsigned short *pmi_base;
 334                 pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
 335                 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
 336                 pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
 337                 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
 338                 if (pmi_base[3]) {
 339                         printk(KERN_INFO "vesafb: pmi: ports = ");
 340                         for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
 341                                 printk("%x ", pmi_base[i]);
 342                         printk("\n");
 343                         if (pmi_base[i] != 0xffff) {
 344                                 /*
 345                                  * memory areas not supported (yet?)
 346                                  *
 347                                  * Rules are: we have to set up a descriptor for the requested
 348                                  * memory area and pass it in the ES register to the BIOS function.
 349                                  */
 350                                 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
 351                                 ypan = pmi_setpal = 0;
 352                         }
 353                 }
 354         }
 355
 356         if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
 357                 printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
 358                                     "        colors may be incorrect\n");
 359                 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 360         }
 361
 362         vesafb_defined.xres_virtual = vesafb_defined.xres;
 363         vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
 364         if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
 365                 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
 366                        (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
 367         } else {
 368                 printk(KERN_INFO "vesafb: scrolling: redraw\n");
 369                 vesafb_defined.yres_virtual = vesafb_defined.yres;
 370                 ypan = 0;
 371         }
 372
 373         /* some dummy values for timing to make fbset happy */
 374         vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
 375         vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
 376         vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
 377
 378         vesafb_defined.red.offset    = screen_info.red_pos;
 379         vesafb_defined.red.length    = screen_info.red_size;
 380         vesafb_defined.green.offset  = screen_info.green_pos;
 381         vesafb_defined.green.length  = screen_info.green_size;
 382         vesafb_defined.blue.offset   = screen_info.blue_pos;
 383         vesafb_defined.blue.length   = screen_info.blue_size;
 384         vesafb_defined.transp.offset = screen_info.rsvd_pos;
 385         vesafb_defined.transp.length = screen_info.rsvd_size;
 386
 387         if (vesafb_defined.bits_per_pixel <= 8) {
 388                 depth = vesafb_defined.green.length;
 389                 vesafb_defined.red.length =
 390                 vesafb_defined.green.length =
 391                 vesafb_defined.blue.length =
 392                 vesafb_defined.bits_per_pixel;
 393         }
 394
 395         printk(KERN_INFO "vesafb: %s: "
 396                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 397                (vesafb_defined.bits_per_pixel > 8) ?
 398                "Truecolor" : (vga_compat || pmi_setpal) ?
 399                "Pseudocolor" : "Static Pseudocolor",
 400                screen_info.rsvd_size,
 401                screen_info.red_size,
 402                screen_info.green_size,
 403                screen_info.blue_size,
 404                screen_info.rsvd_pos,
 405                screen_info.red_pos,
 406                screen_info.green_pos,
 407                screen_info.blue_pos);
 408
 409         vesafb_fix.ypanstep  = ypan     ? 1 : 0;
 410         vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
 411
 412         /* request failure does not faze us, as vgacon probably has this
 413          * region already (FIXME) */
 414         request_region(0x3c0, 32, "vesafb");
 415
 416         if (mtrr == 3) {
 417                 unsigned int temp_size = size_total;
 418
 419                 /* Find the largest power-of-two */
 420                 temp_size = roundup_pow_of_two(temp_size);
 421
 422                 /* Try and find a power of two to add */
 423                 do {
 424                         par->wc_cookie =
 425                                 arch_phys_wc_add(vesafb_fix.smem_start,
 426                                                  temp_size);
 427                         temp_size >>= 1;
 428                 } while (temp_size >= PAGE_SIZE && par->wc_cookie < 0);
 429
 430                 info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
 431         } else {
 432                 if (mtrr && mtrr != 3)
 433                         WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n");
 434                 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
 435         }
 436
 437         if (!info->screen_base) {
 438                 printk(KERN_ERR
 439                        "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
 440                         vesafb_fix.smem_len, vesafb_fix.smem_start);
 441                 err = -EIO;
 442                 goto err;
 443         }
 444
 445         printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
 446                "using %dk, total %dk\n",
 447                vesafb_fix.smem_start, info->screen_base,
 448                size_remap/1024, size_total/1024);
 449
 450         info->fbops = &vesafb_ops;
 451         info->var = vesafb_defined;
 452         info->fix = vesafb_fix;
 453         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
 454                 (ypan ? FBINFO_HWACCEL_YPAN : 0);
 455
 456         if (!ypan)
 457                 info->fbops->fb_pan_display = NULL;
 458
 459         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 460                 err = -ENOMEM;
 461                 goto err;
 462         }
 463         if (register_framebuffer(info)<0) {
 464                 err = -EINVAL;
 465                 fb_dealloc_cmap(&info->cmap);
 466                 goto err;
 467         }
 468         fb_info(info, "%s frame buffer device\n", info->fix.id);
 469         return 0;
 470 err:
 471         arch_phys_wc_del(par->wc_cookie);
 472         if (info->screen_base)
 473                 iounmap(info->screen_base);
 474         framebuffer_release(info);
 475         release_mem_region(vesafb_fix.smem_start, size_total);
 476         return err;
 477 }
 478
 479 static int vesafb_remove(struct platform_device *pdev)
 480 {
 481         struct fb_info *info = platform_get_drvdata(pdev);
 482
 483         unregister_framebuffer(info);
 484         framebuffer_release(info);
 485
 486         return 0;
 487 }
 488
 489 static struct platform_driver vesafb_driver = {
 490         .driver = {
 491                 .name = "vesa-framebuffer",
 492         },
 493         .probe = vesafb_probe,
 494         .remove = vesafb_remove,
 495 };
 496
 497 module_platform_driver(vesafb_driver);
 498 MODULE_LICENSE("GPL");