linux/drivers/video/vesafb.c
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   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/delay.h>
  17#include <linux/fb.h>
  18#include <linux/ioport.h>
  19#include <linux/init.h>
  20#include <linux/platform_device.h>
  21#include <linux/screen_info.h>
  22
  23#include <video/vga.h>
  24#include <asm/io.h>
  25#include <asm/mtrr.h>
  26
  27#define dac_reg (0x3c8)
  28#define dac_val (0x3c9)
  29
  30/* --------------------------------------------------------------------- */
  31
  32static struct fb_var_screeninfo vesafb_defined __initdata = {
  33        .activate       = FB_ACTIVATE_NOW,
  34        .height         = -1,
  35        .width          = -1,
  36        .right_margin   = 32,
  37        .upper_margin   = 16,
  38        .lower_margin   = 4,
  39        .vsync_len      = 4,
  40        .vmode          = FB_VMODE_NONINTERLACED,
  41};
  42
  43static struct fb_fix_screeninfo vesafb_fix __initdata = {
  44        .id     = "VESA VGA",
  45        .type   = FB_TYPE_PACKED_PIXELS,
  46        .accel  = FB_ACCEL_NONE,
  47};
  48
  49static int   inverse    __read_mostly;
  50static int   mtrr       __read_mostly;          /* disable mtrr */
  51static int   vram_remap __initdata;             /* Set amount of memory to be used */
  52static int   vram_total __initdata;             /* Set total amount of memory */
  53static int   pmi_setpal __read_mostly = 1;      /* pmi for palette changes ??? */
  54static int   ypan       __read_mostly;          /* 0..nothing, 1..ypan, 2..ywrap */
  55static void  (*pmi_start)(void) __read_mostly;
  56static void  (*pmi_pal)  (void) __read_mostly;
  57static int   depth      __read_mostly;
  58static int   vga_compat __read_mostly;
  59/* --------------------------------------------------------------------- */
  60
  61static int vesafb_pan_display(struct fb_var_screeninfo *var,
  62                              struct fb_info *info)
  63{
  64#ifdef __i386__
  65        int offset;
  66
  67        offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
  68
  69        __asm__ __volatile__(
  70                "call *(%%edi)"
  71                : /* no return value */
  72                : "a" (0x4f07),         /* EAX */
  73                  "b" (0),              /* EBX */
  74                  "c" (offset),         /* ECX */
  75                  "d" (offset >> 16),   /* EDX */
  76                  "D" (&pmi_start));    /* EDI */
  77#endif
  78        return 0;
  79}
  80
  81static int vesa_setpalette(int regno, unsigned red, unsigned green,
  82                            unsigned blue)
  83{
  84        int shift = 16 - depth;
  85        int err = -EINVAL;
  86
  87/*
  88 * Try VGA registers first...
  89 */
  90        if (vga_compat) {
  91                outb_p(regno,       dac_reg);
  92                outb_p(red   >> shift, dac_val);
  93                outb_p(green >> shift, dac_val);
  94                outb_p(blue  >> shift, dac_val);
  95                err = 0;
  96        }
  97
  98#ifdef __i386__
  99/*
 100 * Fallback to the PMI....
 101 */
 102        if (err && pmi_setpal) {
 103                struct { u_char blue, green, red, pad; } entry;
 104
 105                entry.red   = red   >> shift;
 106                entry.green = green >> shift;
 107                entry.blue  = blue  >> shift;
 108                entry.pad   = 0;
 109                __asm__ __volatile__(
 110                "call *(%%esi)"
 111                : /* no return value */
 112                : "a" (0x4f09),         /* EAX */
 113                  "b" (0),              /* EBX */
 114                  "c" (1),              /* ECX */
 115                  "d" (regno),          /* EDX */
 116                  "D" (&entry),         /* EDI */
 117                  "S" (&pmi_pal));      /* ESI */
 118                err = 0;
 119        }
 120#endif
 121
 122        return err;
 123}
 124
 125static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 126                            unsigned blue, unsigned transp,
 127                            struct fb_info *info)
 128{
 129        int err = 0;
 130
 131        /*
 132         *  Set a single color register. The values supplied are
 133         *  already rounded down to the hardware's capabilities
 134         *  (according to the entries in the `var' structure). Return
 135         *  != 0 for invalid regno.
 136         */
 137        
 138        if (regno >= info->cmap.len)
 139                return 1;
 140
 141        if (info->var.bits_per_pixel == 8)
 142                err = vesa_setpalette(regno,red,green,blue);
 143        else if (regno < 16) {
 144                switch (info->var.bits_per_pixel) {
 145                case 16:
 146                        if (info->var.red.offset == 10) {
 147                                /* 1:5:5:5 */
 148                                ((u32*) (info->pseudo_palette))[regno] =
 149                                        ((red   & 0xf800) >>  1) |
 150                                        ((green & 0xf800) >>  6) |
 151                                        ((blue  & 0xf800) >> 11);
 152                        } else {
 153                                /* 0:5:6:5 */
 154                                ((u32*) (info->pseudo_palette))[regno] =
 155                                        ((red   & 0xf800)      ) |
 156                                        ((green & 0xfc00) >>  5) |
 157                                        ((blue  & 0xf800) >> 11);
 158                        }
 159                        break;
 160                case 24:
 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        }
 172
 173        return err;
 174}
 175
 176static void vesafb_destroy(struct fb_info *info)
 177{
 178        fb_dealloc_cmap(&info->cmap);
 179        if (info->screen_base)
 180                iounmap(info->screen_base);
 181        release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
 182        framebuffer_release(info);
 183}
 184
 185static struct fb_ops vesafb_ops = {
 186        .owner          = THIS_MODULE,
 187        .fb_destroy     = vesafb_destroy,
 188        .fb_setcolreg   = vesafb_setcolreg,
 189        .fb_pan_display = vesafb_pan_display,
 190        .fb_fillrect    = cfb_fillrect,
 191        .fb_copyarea    = cfb_copyarea,
 192        .fb_imageblit   = cfb_imageblit,
 193};
 194
 195static int __init vesafb_setup(char *options)
 196{
 197        char *this_opt;
 198        
 199        if (!options || !*options)
 200                return 0;
 201        
 202        while ((this_opt = strsep(&options, ",")) != NULL) {
 203                if (!*this_opt) continue;
 204                
 205                if (! strcmp(this_opt, "inverse"))
 206                        inverse=1;
 207                else if (! strcmp(this_opt, "redraw"))
 208                        ypan=0;
 209                else if (! strcmp(this_opt, "ypan"))
 210                        ypan=1;
 211                else if (! strcmp(this_opt, "ywrap"))
 212                        ypan=2;
 213                else if (! strcmp(this_opt, "vgapal"))
 214                        pmi_setpal=0;
 215                else if (! strcmp(this_opt, "pmipal"))
 216                        pmi_setpal=1;
 217                else if (! strncmp(this_opt, "mtrr:", 5))
 218                        mtrr = simple_strtoul(this_opt+5, NULL, 0);
 219                else if (! strcmp(this_opt, "nomtrr"))
 220                        mtrr=0;
 221                else if (! strncmp(this_opt, "vtotal:", 7))
 222                        vram_total = simple_strtoul(this_opt+7, NULL, 0);
 223                else if (! strncmp(this_opt, "vremap:", 7))
 224                        vram_remap = simple_strtoul(this_opt+7, NULL, 0);
 225        }
 226        return 0;
 227}
 228
 229static int __init vesafb_probe(struct platform_device *dev)
 230{
 231        struct fb_info *info;
 232        int i, err;
 233        unsigned int size_vmode;
 234        unsigned int size_remap;
 235        unsigned int size_total;
 236
 237        if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
 238                return -ENODEV;
 239
 240        vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
 241        vesafb_fix.smem_start = screen_info.lfb_base;
 242        vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
 243        if (15 == vesafb_defined.bits_per_pixel)
 244                vesafb_defined.bits_per_pixel = 16;
 245        vesafb_defined.xres = screen_info.lfb_width;
 246        vesafb_defined.yres = screen_info.lfb_height;
 247        vesafb_fix.line_length = screen_info.lfb_linelength;
 248        vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
 249                FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
 250
 251        /*   size_vmode -- that is the amount of memory needed for the
 252         *                 used video mode, i.e. the minimum amount of
 253         *                 memory we need. */
 254        size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
 255
 256        /*   size_total -- all video memory we have. Used for mtrr
 257         *                 entries, resource allocation and bounds
 258         *                 checking. */
 259        size_total = screen_info.lfb_size * 65536;
 260        if (vram_total)
 261                size_total = vram_total * 1024 * 1024;
 262        if (size_total < size_vmode)
 263                size_total = size_vmode;
 264
 265        /*   size_remap -- the amount of video memory we are going to
 266         *                 use for vesafb.  With modern cards it is no
 267         *                 option to simply use size_total as that
 268         *                 wastes plenty of kernel address space. */
 269        size_remap  = size_vmode * 2;
 270        if (vram_remap)
 271                size_remap = vram_remap * 1024 * 1024;
 272        if (size_remap < size_vmode)
 273                size_remap = size_vmode;
 274        if (size_remap > size_total)
 275                size_remap = size_total;
 276        vesafb_fix.smem_len = size_remap;
 277
 278#ifndef __i386__
 279        screen_info.vesapm_seg = 0;
 280#endif
 281
 282        if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
 283                printk(KERN_WARNING
 284                       "vesafb: cannot reserve video memory at 0x%lx\n",
 285                        vesafb_fix.smem_start);
 286                /* We cannot make this fatal. Sometimes this comes from magic
 287                   spaces our resource handlers simply don't know about */
 288        }
 289
 290        info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
 291        if (!info) {
 292                release_mem_region(vesafb_fix.smem_start, size_total);
 293                return -ENOMEM;
 294        }
 295        info->pseudo_palette = info->par;
 296        info->par = NULL;
 297
 298        /* set vesafb aperture size for generic probing */
 299        info->apertures = alloc_apertures(1);
 300        if (!info->apertures) {
 301                err = -ENOMEM;
 302                goto err;
 303        }
 304        info->apertures->ranges[0].base = screen_info.lfb_base;
 305        info->apertures->ranges[0].size = size_total;
 306
 307        printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 308               vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
 309
 310        if (screen_info.vesapm_seg) {
 311                printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
 312                       screen_info.vesapm_seg,screen_info.vesapm_off);
 313        }
 314
 315        if (screen_info.vesapm_seg < 0xc000)
 316                ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
 317
 318        if (ypan || pmi_setpal) {
 319                unsigned short *pmi_base;
 320                pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
 321                pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
 322                pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
 323                printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
 324                if (pmi_base[3]) {
 325                        printk(KERN_INFO "vesafb: pmi: ports = ");
 326                                for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
 327                                        printk("%x ",pmi_base[i]);
 328                        printk("\n");
 329                        if (pmi_base[i] != 0xffff) {
 330                                /*
 331                                 * memory areas not supported (yet?)
 332                                 *
 333                                 * Rules are: we have to set up a descriptor for the requested
 334                                 * memory area and pass it in the ES register to the BIOS function.
 335                                 */
 336                                printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
 337                                ypan = pmi_setpal = 0;
 338                        }
 339                }
 340        }
 341
 342        if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
 343                printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
 344                                    "        colors may be incorrect\n");
 345                vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 346        }
 347
 348        vesafb_defined.xres_virtual = vesafb_defined.xres;
 349        vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
 350        if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
 351                printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
 352                       (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
 353        } else {
 354                printk(KERN_INFO "vesafb: scrolling: redraw\n");
 355                vesafb_defined.yres_virtual = vesafb_defined.yres;
 356                ypan = 0;
 357        }
 358
 359        /* some dummy values for timing to make fbset happy */
 360        vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
 361        vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
 362        vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
 363        
 364        vesafb_defined.red.offset    = screen_info.red_pos;
 365        vesafb_defined.red.length    = screen_info.red_size;
 366        vesafb_defined.green.offset  = screen_info.green_pos;
 367        vesafb_defined.green.length  = screen_info.green_size;
 368        vesafb_defined.blue.offset   = screen_info.blue_pos;
 369        vesafb_defined.blue.length   = screen_info.blue_size;
 370        vesafb_defined.transp.offset = screen_info.rsvd_pos;
 371        vesafb_defined.transp.length = screen_info.rsvd_size;
 372
 373        if (vesafb_defined.bits_per_pixel <= 8) {
 374                depth = vesafb_defined.green.length;
 375                vesafb_defined.red.length =
 376                vesafb_defined.green.length =
 377                vesafb_defined.blue.length =
 378                vesafb_defined.bits_per_pixel;
 379        }
 380
 381        printk(KERN_INFO "vesafb: %s: "
 382               "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 383               (vesafb_defined.bits_per_pixel > 8) ?
 384               "Truecolor" : (vga_compat || pmi_setpal) ?
 385               "Pseudocolor" : "Static Pseudocolor",
 386               screen_info.rsvd_size,
 387               screen_info.red_size,
 388               screen_info.green_size,
 389               screen_info.blue_size,
 390               screen_info.rsvd_pos,
 391               screen_info.red_pos,
 392               screen_info.green_pos,
 393               screen_info.blue_pos);
 394
 395        vesafb_fix.ypanstep  = ypan     ? 1 : 0;
 396        vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
 397
 398        /* request failure does not faze us, as vgacon probably has this
 399         * region already (FIXME) */
 400        request_region(0x3c0, 32, "vesafb");
 401
 402#ifdef CONFIG_MTRR
 403        if (mtrr) {
 404                unsigned int temp_size = size_total;
 405                unsigned int type = 0;
 406
 407                switch (mtrr) {
 408                case 1:
 409                        type = MTRR_TYPE_UNCACHABLE;
 410                        break;
 411                case 2:
 412                        type = MTRR_TYPE_WRBACK;
 413                        break;
 414                case 3:
 415                        type = MTRR_TYPE_WRCOMB;
 416                        break;
 417                case 4:
 418                        type = MTRR_TYPE_WRTHROUGH;
 419                        break;
 420                default:
 421                        type = 0;
 422                        break;
 423                }
 424
 425                if (type) {
 426                        int rc;
 427
 428                        /* Find the largest power-of-two */
 429                        temp_size = roundup_pow_of_two(temp_size);
 430
 431                        /* Try and find a power of two to add */
 432                        do {
 433                                rc = mtrr_add(vesafb_fix.smem_start, temp_size,
 434                                              type, 1);
 435                                temp_size >>= 1;
 436                        } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
 437                }
 438        }
 439#endif
 440        
 441        switch (mtrr) {
 442        case 1: /* uncachable */
 443                info->screen_base = ioremap_nocache(vesafb_fix.smem_start, vesafb_fix.smem_len);
 444                break;
 445        case 2: /* write-back */
 446                info->screen_base = ioremap_cache(vesafb_fix.smem_start, vesafb_fix.smem_len);
 447                break;
 448        case 3: /* write-combining */
 449                info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
 450                break;
 451        case 4: /* write-through */
 452        default:
 453                info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
 454                break;
 455        }
 456        if (!info->screen_base) {
 457                printk(KERN_ERR
 458                       "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
 459                        vesafb_fix.smem_len, vesafb_fix.smem_start);
 460                err = -EIO;
 461                goto err;
 462        }
 463
 464        printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
 465               "using %dk, total %dk\n",
 466               vesafb_fix.smem_start, info->screen_base,
 467               size_remap/1024, size_total/1024);
 468
 469        info->fbops = &vesafb_ops;
 470        info->var = vesafb_defined;
 471        info->fix = vesafb_fix;
 472        info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
 473                (ypan ? FBINFO_HWACCEL_YPAN : 0);
 474
 475        if (!ypan)
 476                info->fbops->fb_pan_display = NULL;
 477
 478        if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 479                err = -ENOMEM;
 480                goto err;
 481        }
 482        if (register_framebuffer(info)<0) {
 483                err = -EINVAL;
 484                fb_dealloc_cmap(&info->cmap);
 485                goto err;
 486        }
 487        printk(KERN_INFO "fb%d: %s frame buffer device\n",
 488               info->node, info->fix.id);
 489        return 0;
 490err:
 491        if (info->screen_base)
 492                iounmap(info->screen_base);
 493        framebuffer_release(info);
 494        release_mem_region(vesafb_fix.smem_start, size_total);
 495        return err;
 496}
 497
 498static struct platform_driver vesafb_driver = {
 499        .driver = {
 500                .name   = "vesafb",
 501        },
 502};
 503
 504static struct platform_device *vesafb_device;
 505
 506static int __init vesafb_init(void)
 507{
 508        int ret;
 509        char *option = NULL;
 510
 511        /* ignore error return of fb_get_options */
 512        fb_get_options("vesafb", &option);
 513        vesafb_setup(option);
 514
 515        vesafb_device = platform_device_alloc("vesafb", 0);
 516        if (!vesafb_device)
 517                return -ENOMEM;
 518
 519        ret = platform_device_add(vesafb_device);
 520        if (!ret) {
 521                ret = platform_driver_probe(&vesafb_driver, vesafb_probe);
 522                if (ret)
 523                        platform_device_del(vesafb_device);
 524        }
 525
 526        if (ret) {
 527                platform_device_put(vesafb_device);
 528                vesafb_device = NULL;
 529        }
 530
 531        return ret;
 532}
 533module_init(vesafb_init);
 534
 535MODULE_LICENSE("GPL");
 536
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