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         struct resource *region;
  36 };
  37
  38 static struct fb_var_screeninfo vesafb_defined = {
  39         .activate       = FB_ACTIVATE_NOW,
  40         .height         = -1,
  41         .width          = -1,
  42         .right_margin   = 32,
  43         .upper_margin   = 16,
  44         .lower_margin   = 4,
  45         .vsync_len      = 4,
  46         .vmode          = FB_VMODE_NONINTERLACED,
  47 };
  48
  49 static struct fb_fix_screeninfo vesafb_fix = {
  50         .id     = "VESA VGA",
  51         .type   = FB_TYPE_PACKED_PIXELS,
  52         .accel  = FB_ACCEL_NONE,
  53 };
  54
  55 static int   inverse    __read_mostly;
  56 static int   mtrr       __read_mostly;          /* disable mtrr */
  57 static int   vram_remap;                        /* Set amount of memory to be used */
  58 static int   vram_total;                        /* Set total amount of memory */
  59 static int   pmi_setpal __read_mostly = 1;      /* pmi for palette changes ??? */
  60 static int   ypan       __read_mostly;          /* 0..nothing, 1..ypan, 2..ywrap */
  61 static void  (*pmi_start)(void) __read_mostly;
  62 static void  (*pmi_pal)  (void) __read_mostly;
  63 static int   depth      __read_mostly;
  64 static int   vga_compat __read_mostly;
  65 /* --------------------------------------------------------------------- */
  66
  67 static int vesafb_pan_display(struct fb_var_screeninfo *var,
  68                               struct fb_info *info)
  69 {
  70 #ifdef __i386__
  71         int offset;
  72
  73         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
  74
  75         __asm__ __volatile__(
  76                 "call *(%%edi)"
  77                 : /* no return value */
  78                 : "a" (0x4f07),         /* EAX */
  79                   "b" (0),              /* EBX */
  80                   "c" (offset),         /* ECX */
  81                   "d" (offset >> 16),   /* EDX */
  82                   "D" (&pmi_start));    /* EDI */
  83 #endif
  84         return 0;
  85 }
  86
  87 static int vesa_setpalette(int regno, unsigned red, unsigned green,
  88                             unsigned blue)
  89 {
  90         int shift = 16 - depth;
  91         int err = -EINVAL;
  92
  93 /*
  94  * Try VGA registers first...
  95  */
  96         if (vga_compat) {
  97                 outb_p(regno,       dac_reg);
  98                 outb_p(red   >> shift, dac_val);
  99                 outb_p(green >> shift, dac_val);
 100                 outb_p(blue  >> shift, dac_val);
 101                 err = 0;
 102         }
 103
 104 #ifdef __i386__
 105 /*
 106  * Fallback to the PMI....
 107  */
 108         if (err && pmi_setpal) {
 109                 struct { u_char blue, green, red, pad; } entry;
 110
 111                 entry.red   = red   >> shift;
 112                 entry.green = green >> shift;
 113                 entry.blue  = blue  >> shift;
 114                 entry.pad   = 0;
 115                 __asm__ __volatile__(
 116                 "call *(%%esi)"
 117                 : /* no return value */
 118                 : "a" (0x4f09),         /* EAX */
 119                   "b" (0),              /* EBX */
 120                   "c" (1),              /* ECX */
 121                   "d" (regno),          /* EDX */
 122                   "D" (&entry),         /* EDI */
 123                   "S" (&pmi_pal));      /* ESI */
 124                 err = 0;
 125         }
 126 #endif
 127
 128         return err;
 129 }
 130
 131 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 132                             unsigned blue, unsigned transp,
 133                             struct fb_info *info)
 134 {
 135         int err = 0;
 136
 137         /*
 138          *  Set a single color register. The values supplied are
 139          *  already rounded down to the hardware's capabilities
 140          *  (according to the entries in the `var' structure). Return
 141          *  != 0 for invalid regno.
 142          */
 143
 144         if (regno >= info->cmap.len)
 145                 return 1;
 146
 147         if (info->var.bits_per_pixel == 8)
 148                 err = vesa_setpalette(regno,red,green,blue);
 149         else if (regno < 16) {
 150                 switch (info->var.bits_per_pixel) {
 151                 case 16:
 152                         if (info->var.red.offset == 10) {
 153                                 /* 1:5:5:5 */
 154                                 ((u32*) (info->pseudo_palette))[regno] =
 155                                         ((red   & 0xf800) >>  1) |
 156                                         ((green & 0xf800) >>  6) |
 157                                         ((blue  & 0xf800) >> 11);
 158                         } else {
 159                                 /* 0:5:6:5 */
 160                                 ((u32*) (info->pseudo_palette))[regno] =
 161                                         ((red   & 0xf800)      ) |
 162                                         ((green & 0xfc00) >>  5) |
 163                                         ((blue  & 0xf800) >> 11);
 164                         }
 165                         break;
 166                 case 24:
 167                 case 32:
 168                         red   >>= 8;
 169                         green >>= 8;
 170                         blue  >>= 8;
 171                         ((u32 *)(info->pseudo_palette))[regno] =
 172                                 (red   << info->var.red.offset)   |
 173                                 (green << info->var.green.offset) |
 174                                 (blue  << info->var.blue.offset);
 175                         break;
 176                 }
 177         }
 178
 179         return err;
 180 }
 181
 182 static void vesafb_destroy(struct fb_info *info)
 183 {
 184         struct vesafb_par *par = info->par;
 185
 186         fb_dealloc_cmap(&info->cmap);
 187         arch_phys_wc_del(par->wc_cookie);
 188         if (info->screen_base)
 189                 iounmap(info->screen_base);
 190         release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
 191 }
 192
 193 static struct fb_ops vesafb_ops = {
 194         .owner          = THIS_MODULE,
 195         .fb_destroy     = vesafb_destroy,
 196         .fb_setcolreg   = vesafb_setcolreg,
 197         .fb_pan_display = vesafb_pan_display,
 198         .fb_fillrect    = cfb_fillrect,
 199         .fb_copyarea    = cfb_copyarea,
 200         .fb_imageblit   = cfb_imageblit,
 201 };
 202
 203 static int vesafb_setup(char *options)
 204 {
 205         char *this_opt;
 206
 207         if (!options || !*options)
 208                 return 0;
 209
 210         while ((this_opt = strsep(&options, ",")) != NULL) {
 211                 if (!*this_opt) continue;
 212
 213                 if (! strcmp(this_opt, "inverse"))
 214                         inverse=1;
 215                 else if (! strcmp(this_opt, "redraw"))
 216                         ypan=0;
 217                 else if (! strcmp(this_opt, "ypan"))
 218                         ypan=1;
 219                 else if (! strcmp(this_opt, "ywrap"))
 220                         ypan=2;
 221                 else if (! strcmp(this_opt, "vgapal"))
 222                         pmi_setpal=0;
 223                 else if (! strcmp(this_opt, "pmipal"))
 224                         pmi_setpal=1;
 225                 else if (! strncmp(this_opt, "mtrr:", 5))
 226                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
 227                 else if (! strcmp(this_opt, "nomtrr"))
 228                         mtrr=0;
 229                 else if (! strncmp(this_opt, "vtotal:", 7))
 230                         vram_total = simple_strtoul(this_opt+7, NULL, 0);
 231                 else if (! strncmp(this_opt, "vremap:", 7))
 232                         vram_remap = simple_strtoul(this_opt+7, NULL, 0);
 233         }
 234         return 0;
 235 }
 236
 237 static int vesafb_probe(struct platform_device *dev)
 238 {
 239         struct fb_info *info;
 240         struct vesafb_par *par;
 241         int i, err;
 242         unsigned int size_vmode;
 243         unsigned int size_remap;
 244         unsigned int size_total;
 245         char *option = NULL;
 246
 247         /* ignore error return of fb_get_options */
 248         fb_get_options("vesafb", &option);
 249         vesafb_setup(option);
 250
 251         if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
 252                 return -ENODEV;
 253
 254         vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
 255         vesafb_fix.smem_start = screen_info.lfb_base;
 256         vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
 257         if (15 == vesafb_defined.bits_per_pixel)
 258                 vesafb_defined.bits_per_pixel = 16;
 259         vesafb_defined.xres = screen_info.lfb_width;
 260         vesafb_defined.yres = screen_info.lfb_height;
 261         vesafb_fix.line_length = screen_info.lfb_linelength;
 262         vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
 263                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
 264
 265         /*   size_vmode -- that is the amount of memory needed for the
 266          *                 used video mode, i.e. the minimum amount of
 267          *                 memory we need. */
 268         size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
 269
 270         /*   size_total -- all video memory we have. Used for mtrr
 271          *                 entries, resource allocation and bounds
 272          *                 checking. */
 273         size_total = screen_info.lfb_size * 65536;
 274         if (vram_total)
 275                 size_total = vram_total * 1024 * 1024;
 276         if (size_total < size_vmode)
 277                 size_total = size_vmode;
 278
 279         /*   size_remap -- the amount of video memory we are going to
 280          *                 use for vesafb.  With modern cards it is no
 281          *                 option to simply use size_total as that
 282          *                 wastes plenty of kernel address space. */
 283         size_remap  = size_vmode * 2;
 284         if (vram_remap)
 285                 size_remap = vram_remap * 1024 * 1024;
 286         if (size_remap < size_vmode)
 287                 size_remap = size_vmode;
 288         if (size_remap > size_total)
 289                 size_remap = size_total;
 290         vesafb_fix.smem_len = size_remap;
 291
 292 #ifndef __i386__
 293         screen_info.vesapm_seg = 0;
 294 #endif
 295
 296         if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
 297                 printk(KERN_WARNING
 298                        "vesafb: cannot reserve video memory at 0x%lx\n",
 299                         vesafb_fix.smem_start);
 300                 /* We cannot make this fatal. Sometimes this comes from magic
 301                    spaces our resource handlers simply don't know about */
 302         }
 303
 304         info = framebuffer_alloc(sizeof(struct vesafb_par), &dev->dev);
 305         if (!info) {
 306                 release_mem_region(vesafb_fix.smem_start, size_total);
 307                 return -ENOMEM;
 308         }
 309         platform_set_drvdata(dev, info);
 310         par = info->par;
 311         info->pseudo_palette = par->pseudo_palette;
 312
 313         /* set vesafb aperture size for generic probing */
 314         info->apertures = alloc_apertures(1);
 315         if (!info->apertures) {
 316                 err = -ENOMEM;
 317                 goto err;
 318         }
 319         info->apertures->ranges[0].base = screen_info.lfb_base;
 320         info->apertures->ranges[0].size = size_total;
 321
 322         printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 323                vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
 324
 325         if (screen_info.vesapm_seg) {
 326                 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
 327                        screen_info.vesapm_seg,screen_info.vesapm_off);
 328         }
 329
 330         if (screen_info.vesapm_seg < 0xc000)
 331                 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
 332
 333         if (ypan || pmi_setpal) {
 334                 unsigned short *pmi_base;
 335                 pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
 336                 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
 337                 pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
 338                 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
 339                 if (pmi_base[3]) {
 340                         printk(KERN_INFO "vesafb: pmi: ports = ");
 341                         for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
 342                                 printk("%x ", pmi_base[i]);
 343                         printk("\n");
 344                         if (pmi_base[i] != 0xffff) {
 345                                 /*
 346                                  * memory areas not supported (yet?)
 347                                  *
 348                                  * Rules are: we have to set up a descriptor for the requested
 349                                  * memory area and pass it in the ES register to the BIOS function.
 350                                  */
 351                                 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
 352                                 ypan = pmi_setpal = 0;
 353                         }
 354                 }
 355         }
 356
 357         if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
 358                 printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
 359                                     "        colors may be incorrect\n");
 360                 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 361         }
 362
 363         vesafb_defined.xres_virtual = vesafb_defined.xres;
 364         vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
 365         if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
 366                 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
 367                        (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
 368         } else {
 369                 printk(KERN_INFO "vesafb: scrolling: redraw\n");
 370                 vesafb_defined.yres_virtual = vesafb_defined.yres;
 371                 ypan = 0;
 372         }
 373
 374         /* some dummy values for timing to make fbset happy */
 375         vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
 376         vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
 377         vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
 378
 379         vesafb_defined.red.offset    = screen_info.red_pos;
 380         vesafb_defined.red.length    = screen_info.red_size;
 381         vesafb_defined.green.offset  = screen_info.green_pos;
 382         vesafb_defined.green.length  = screen_info.green_size;
 383         vesafb_defined.blue.offset   = screen_info.blue_pos;
 384         vesafb_defined.blue.length   = screen_info.blue_size;
 385         vesafb_defined.transp.offset = screen_info.rsvd_pos;
 386         vesafb_defined.transp.length = screen_info.rsvd_size;
 387
 388         if (vesafb_defined.bits_per_pixel <= 8) {
 389                 depth = vesafb_defined.green.length;
 390                 vesafb_defined.red.length =
 391                 vesafb_defined.green.length =
 392                 vesafb_defined.blue.length =
 393                 vesafb_defined.bits_per_pixel;
 394         }
 395
 396         printk(KERN_INFO "vesafb: %s: "
 397                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 398                (vesafb_defined.bits_per_pixel > 8) ?
 399                "Truecolor" : (vga_compat || pmi_setpal) ?
 400                "Pseudocolor" : "Static Pseudocolor",
 401                screen_info.rsvd_size,
 402                screen_info.red_size,
 403                screen_info.green_size,
 404                screen_info.blue_size,
 405                screen_info.rsvd_pos,
 406                screen_info.red_pos,
 407                screen_info.green_pos,
 408                screen_info.blue_pos);
 409
 410         vesafb_fix.ypanstep  = ypan     ? 1 : 0;
 411         vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
 412
 413         /* request failure does not faze us, as vgacon probably has this
 414          * region already (FIXME) */
 415         par->region = request_region(0x3c0, 32, "vesafb");
 416
 417         if (mtrr == 3) {
 418                 unsigned int temp_size = size_total;
 419
 420                 /* Find the largest power-of-two */
 421                 temp_size = roundup_pow_of_two(temp_size);
 422
 423                 /* Try and find a power of two to add */
 424                 do {
 425                         par->wc_cookie =
 426                                 arch_phys_wc_add(vesafb_fix.smem_start,
 427                                                  temp_size);
 428                         temp_size >>= 1;
 429                 } while (temp_size >= PAGE_SIZE && par->wc_cookie < 0);
 430
 431                 info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
 432         } else {
 433                 if (mtrr && mtrr != 3)
 434                         WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n");
 435                 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
 436         }
 437
 438         if (!info->screen_base) {
 439                 printk(KERN_ERR
 440                        "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
 441                         vesafb_fix.smem_len, vesafb_fix.smem_start);
 442                 err = -EIO;
 443                 goto err_release_region;
 444         }
 445
 446         printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
 447                "using %dk, total %dk\n",
 448                vesafb_fix.smem_start, info->screen_base,
 449                size_remap/1024, size_total/1024);
 450
 451         if (!ypan)
 452                 vesafb_ops.fb_pan_display = NULL;
 453
 454         info->fbops = &vesafb_ops;
 455         info->var = vesafb_defined;
 456         info->fix = vesafb_fix;
 457         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
 458                 (ypan ? FBINFO_HWACCEL_YPAN : 0);
 459
 460         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 461                 err = -ENOMEM;
 462                 goto err_release_region;
 463         }
 464         if (register_framebuffer(info)<0) {
 465                 err = -EINVAL;
 466                 fb_dealloc_cmap(&info->cmap);
 467                 goto err_release_region;
 468         }
 469         fb_info(info, "%s frame buffer device\n", info->fix.id);
 470         return 0;
 471 err_release_region:
 472         arch_phys_wc_del(par->wc_cookie);
 473         if (info->screen_base)
 474                 iounmap(info->screen_base);
 475         if (par->region)
 476                 release_region(0x3c0, 32);
 477 err:
 478         framebuffer_release(info);
 479         release_mem_region(vesafb_fix.smem_start, size_total);
 480         return err;
 481 }
 482
 483 static int vesafb_remove(struct platform_device *pdev)
 484 {
 485         struct fb_info *info = platform_get_drvdata(pdev);
 486
 487         unregister_framebuffer(info);
 488         if (((struct vesafb_par *)(info->par))->region)
 489                 release_region(0x3c0, 32);
 490         framebuffer_release(info);
 491
 492         return 0;
 493 }
 494
 495 static struct platform_driver vesafb_driver = {
 496         .driver = {
 497                 .name = "vesa-framebuffer",
 498         },
 499         .probe = vesafb_probe,
 500         .remove = vesafb_remove,
 501 };
 502
 503 module_platform_driver(vesafb_driver);
 504 MODULE_LICENSE("GPL");