drivers/video/offb.c

   1 /*
   2  *  linux/drivers/video/offb.c -- Open Firmware based frame buffer device
   3  *
   4  *      Copyright (C) 1997 Geert Uytterhoeven
   5  *
   6  *  This driver is partly based on the PowerMac console driver:
   7  *
   8  *      Copyright (C) 1996 Paul Mackerras
   9  *
  10  *  This file is subject to the terms and conditions of the GNU General Public
  11  *  License. See the file COPYING in the main directory of this archive for
  12  *  more details.
  13  */
  14
  15 #include <linux/config.h>
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/errno.h>
  19 #include <linux/string.h>
  20 #include <linux/mm.h>
  21 #include <linux/tty.h>
  22 #include <linux/slab.h>
  23 #include <linux/vmalloc.h>
  24 #include <linux/delay.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/fb.h>
  27 #include <linux/init.h>
  28 #include <linux/ioport.h>
  29 #include <asm/io.h>
  30 #include <asm/prom.h>
  31 #ifdef CONFIG_BOOTX_TEXT
  32 #include <asm/bootx.h>
  33 #endif
  34
  35 #include "macmodes.h"
  36
  37 /* Supported palette hacks */
  38 enum {
  39         cmap_unknown,
  40         cmap_m64,               /* ATI Mach64 */
  41         cmap_r128,              /* ATI Rage128 */
  42         cmap_M3A,               /* ATI Rage Mobility M3 Head A */
  43         cmap_M3B,               /* ATI Rage Mobility M3 Head B */
  44         cmap_radeon,            /* ATI Radeon */
  45         cmap_gxt2000,           /* IBM GXT2000 */
  46 };
  47
  48 struct offb_par {
  49         volatile unsigned char *cmap_adr;
  50         volatile unsigned char *cmap_data;
  51         int cmap_type;
  52         int blanked;
  53 };
  54
  55 struct offb_par default_par;
  56
  57 #ifdef __powerpc__
  58 #define mach_eieio()    eieio()
  59 #else
  60 #define mach_eieio()    do {} while (0)
  61 #endif
  62
  63     /*
  64      *  Interface used by the world
  65      */
  66
  67 int offb_init(void);
  68
  69 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  70                           u_int transp, struct fb_info *info);
  71 static int offb_blank(int blank, struct fb_info *info);
  72
  73 #ifdef CONFIG_BOOTX_TEXT
  74 extern boot_infos_t *boot_infos;
  75 #endif
  76
  77 static void offb_init_nodriver(struct device_node *);
  78 static void offb_init_fb(const char *name, const char *full_name,
  79                          int width, int height, int depth, int pitch,
  80                          unsigned long address, struct device_node *dp);
  81
  82 static struct fb_ops offb_ops = {
  83         .owner          = THIS_MODULE,
  84         .fb_setcolreg   = offb_setcolreg,
  85         .fb_blank       = offb_blank,
  86         .fb_fillrect    = cfb_fillrect,
  87         .fb_copyarea    = cfb_copyarea,
  88         .fb_imageblit   = cfb_imageblit,
  89         .fb_cursor      = soft_cursor,
  90 };
  91
  92     /*
  93      *  Set a single color register. The values supplied are already
  94      *  rounded down to the hardware's capabilities (according to the
  95      *  entries in the var structure). Return != 0 for invalid regno.
  96      */
  97
  98 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  99                           u_int transp, struct fb_info *info)
 100 {
 101         struct offb_par *par = (struct offb_par *) info->par;
 102
 103         if (!par->cmap_adr || regno > 255)
 104                 return 1;
 105
 106         red >>= 8;
 107         green >>= 8;
 108         blue >>= 8;
 109
 110         switch (par->cmap_type) {
 111         case cmap_m64:
 112                 *par->cmap_adr = regno;
 113                 mach_eieio();
 114                 *par->cmap_data = red;
 115                 mach_eieio();
 116                 *par->cmap_data = green;
 117                 mach_eieio();
 118                 *par->cmap_data = blue;
 119                 mach_eieio();
 120                 break;
 121         case cmap_M3A:
 122                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 123                 out_le32((unsigned *) (par->cmap_adr + 0x58),
 124                          in_le32((unsigned *) (par->cmap_adr +
 125                                                0x58)) & ~0x20);
 126         case cmap_r128:
 127                 /* Set palette index & data */
 128                 out_8(par->cmap_adr + 0xb0, regno);
 129                 out_le32((unsigned *) (par->cmap_adr + 0xb4),
 130                          (red << 16 | green << 8 | blue));
 131                 break;
 132         case cmap_M3B:
 133                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 134                 out_le32((unsigned *) (par->cmap_adr + 0x58),
 135                          in_le32((unsigned *) (par->cmap_adr +
 136                                                0x58)) | 0x20);
 137                 /* Set palette index & data */
 138                 out_8(par->cmap_adr + 0xb0, regno);
 139                 out_le32((unsigned *) (par->cmap_adr + 0xb4),
 140                          (red << 16 | green << 8 | blue));
 141                 break;
 142         case cmap_radeon:
 143                 /* Set palette index & data (could be smarter) */
 144                 out_8(par->cmap_adr + 0xb0, regno);
 145                 out_le32((unsigned *) (par->cmap_adr + 0xb4),
 146                          (red << 16 | green << 8 | blue));
 147                 break;
 148         case cmap_gxt2000:
 149                 out_le32((unsigned *) par->cmap_adr + regno,
 150                          (red << 16 | green << 8 | blue));
 151                 break;
 152         }
 153
 154         if (regno < 16)
 155                 switch (info->var.bits_per_pixel) {
 156                 case 16:
 157                         ((u16 *) (info->pseudo_palette))[regno] =
 158                             (regno << 10) | (regno << 5) | regno;
 159                         break;
 160                 case 32:
 161                         {
 162                                 int i = (regno << 8) | regno;
 163                                 ((u32 *) (info->pseudo_palette))[regno] =
 164                                     (i << 16) | i;
 165                                 break;
 166                         }
 167                 }
 168         return 0;
 169 }
 170
 171     /*
 172      *  Blank the display.
 173      */
 174
 175 static int offb_blank(int blank, struct fb_info *info)
 176 {
 177         struct offb_par *par = (struct offb_par *) info->par;
 178         int i, j;
 179
 180         if (!par->cmap_adr)
 181                 return 0;
 182
 183         if (!par->blanked)
 184                 if (!blank)
 185                         return 0;
 186
 187         par->blanked = blank;
 188
 189         if (blank)
 190                 for (i = 0; i < 256; i++) {
 191                         switch (par->cmap_type) {
 192                         case cmap_m64:
 193                                 *par->cmap_adr = i;
 194                                 mach_eieio();
 195                                 for (j = 0; j < 3; j++) {
 196                                         *par->cmap_data = 0;
 197                                         mach_eieio();
 198                                 }
 199                                 break;
 200                         case cmap_M3A:
 201                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 202                                 out_le32((unsigned *) (par->cmap_adr +
 203                                                        0x58),
 204                                          in_le32((unsigned *) (par->
 205                                                                cmap_adr +
 206                                                                0x58)) &
 207                                          ~0x20);
 208                         case cmap_r128:
 209                                 /* Set palette index & data */
 210                                 out_8(par->cmap_adr + 0xb0, i);
 211                                 out_le32((unsigned *) (par->cmap_adr +
 212                                                        0xb4), 0);
 213                                 break;
 214                         case cmap_M3B:
 215                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 216                                 out_le32((unsigned *) (par->cmap_adr +
 217                                                        0x58),
 218                                          in_le32((unsigned *) (par->
 219                                                                cmap_adr +
 220                                                                0x58)) |
 221                                          0x20);
 222                                 /* Set palette index & data */
 223                                 out_8(par->cmap_adr + 0xb0, i);
 224                                 out_le32((unsigned *) (par->cmap_adr +
 225                                                        0xb4), 0);
 226                                 break;
 227                         case cmap_radeon:
 228                                 out_8(par->cmap_adr + 0xb0, i);
 229                                 out_le32((unsigned *) (par->cmap_adr +
 230                                                        0xb4), 0);
 231                                 break;
 232                         case cmap_gxt2000:
 233                                 out_le32((unsigned *) par->cmap_adr + i,
 234                                          0);
 235                                 break;
 236                         }
 237         } else
 238                 fb_set_cmap(&info->cmap, 1, info);
 239         return 0;
 240 }
 241
 242     /*
 243      *  Initialisation
 244      */
 245
 246 int __init offb_init(void)
 247 {
 248         struct device_node *dp;
 249         unsigned int dpy;
 250 #if defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32)
 251         struct device_node *displays = find_type_devices("display");
 252         struct device_node *macos_display = NULL;
 253
 254         /* If we're booted from BootX... */
 255         if (prom_num_displays == 0 && boot_infos != 0) {
 256                 unsigned long addr =
 257                     (unsigned long) boot_infos->dispDeviceBase;
 258                 /* find the device node corresponding to the macos display */
 259                 for (dp = displays; dp != NULL; dp = dp->next) {
 260                         int i;
 261                         /*
 262                          * Grrr...  It looks like the MacOS ATI driver
 263                          * munges the assigned-addresses property (but
 264                          * the AAPL,address value is OK).
 265                          */
 266                         if (strncmp(dp->name, "ATY,", 4) == 0
 267                             && dp->n_addrs == 1) {
 268                                 unsigned int *ap =
 269                                     (unsigned int *) get_property(dp,
 270                                                                   "AAPL,address",
 271                                                                   NULL);
 272                                 if (ap != NULL) {
 273                                         dp->addrs[0].address = *ap;
 274                                         dp->addrs[0].size = 0x01000000;
 275                                 }
 276                         }
 277
 278                         /*
 279                          * The LTPro on the Lombard powerbook has no addresses
 280                          * on the display nodes, they are on their parent.
 281                          */
 282                         if (dp->n_addrs == 0
 283                             && device_is_compatible(dp, "ATY,264LTPro")) {
 284                                 int na;
 285                                 unsigned int *ap = (unsigned int *)
 286                                     get_property(dp, "AAPL,address", &na);
 287                                 if (ap != 0)
 288                                         for (na /= sizeof(unsigned int);
 289                                              na > 0; --na, ++ap)
 290                                                 if (*ap <= addr
 291                                                     && addr <
 292                                                     *ap + 0x1000000)
 293                                                         goto foundit;
 294                         }
 295
 296                         /*
 297                          * See if the display address is in one of the address
 298                          * ranges for this display.
 299                          */
 300                         for (i = 0; i < dp->n_addrs; ++i) {
 301                                 if (dp->addrs[i].address <= addr
 302                                     && addr <
 303                                     dp->addrs[i].address +
 304                                     dp->addrs[i].size)
 305                                         break;
 306                         }
 307                         if (i < dp->n_addrs) {
 308                               foundit:
 309                                 printk(KERN_INFO "MacOS display is %s\n",
 310                                        dp->full_name);
 311                                 macos_display = dp;
 312                                 break;
 313                         }
 314                 }
 315
 316                 /* initialize it */
 317                 offb_init_fb(macos_display ? macos_display->
 318                              name : "MacOS display",
 319                              macos_display ? macos_display->
 320                              full_name : "MacOS display",
 321                              boot_infos->dispDeviceRect[2],
 322                              boot_infos->dispDeviceRect[3],
 323                              boot_infos->dispDeviceDepth,
 324                              boot_infos->dispDeviceRowBytes, addr, NULL);
 325         }
 326 #endif /* defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32) */
 327
 328         for (dpy = 0; dpy < prom_num_displays; dpy++) {
 329                 if ((dp = find_path_device(prom_display_paths[dpy])))
 330                         offb_init_nodriver(dp);
 331         }
 332         return 0;
 333 }
 334
 335
 336 static void __init offb_init_nodriver(struct device_node *dp)
 337 {
 338         int *pp, i;
 339         unsigned int len;
 340         int width = 640, height = 480, depth = 8, pitch;
 341         unsigned *up, address;
 342
 343         if ((pp = (int *) get_property(dp, "depth", &len)) != NULL
 344             && len == sizeof(int))
 345                 depth = *pp;
 346         if ((pp = (int *) get_property(dp, "width", &len)) != NULL
 347             && len == sizeof(int))
 348                 width = *pp;
 349         if ((pp = (int *) get_property(dp, "height", &len)) != NULL
 350             && len == sizeof(int))
 351                 height = *pp;
 352         if ((pp = (int *) get_property(dp, "linebytes", &len)) != NULL
 353             && len == sizeof(int)) {
 354                 pitch = *pp;
 355                 if (pitch == 1)
 356                         pitch = 0x1000;
 357         } else
 358                 pitch = width;
 359         if ((up = (unsigned *) get_property(dp, "address", &len)) != NULL
 360             && len == sizeof(unsigned))
 361                 address = (u_long) * up;
 362         else {
 363                 for (i = 0; i < dp->n_addrs; ++i)
 364                         if (dp->addrs[i].size >=
 365                             pitch * height * depth / 8)
 366                                 break;
 367                 if (i >= dp->n_addrs) {
 368                         printk(KERN_ERR
 369                                "no framebuffer address found for %s\n",
 370                                dp->full_name);
 371                         return;
 372                 }
 373
 374                 address = (u_long) dp->addrs[i].address;
 375
 376                 /* kludge for valkyrie */
 377                 if (strcmp(dp->name, "valkyrie") == 0)
 378                         address += 0x1000;
 379         }
 380         offb_init_fb(dp->name, dp->full_name, width, height, depth,
 381                      pitch, address, dp);
 382
 383 }
 384
 385 static void __init offb_init_fb(const char *name, const char *full_name,
 386                                 int width, int height, int depth,
 387                                 int pitch, unsigned long address,
 388                                 struct device_node *dp)
 389 {
 390         unsigned long res_size = pitch * height * depth / 8;
 391         struct offb_par *par = &default_par;
 392         unsigned long res_start = address;
 393         struct fb_fix_screeninfo *fix;
 394         struct fb_var_screeninfo *var;
 395         struct fb_info *info;
 396         int size;
 397
 398         if (!request_mem_region(res_start, res_size, "offb"))
 399                 return;
 400
 401         printk(KERN_INFO
 402                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 403                width, height, name, address, depth, pitch);
 404         if (depth != 8 && depth != 16 && depth != 32) {
 405                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
 406                        depth);
 407                 release_mem_region(res_start, res_size);
 408                 return;
 409         }
 410
 411         size = sizeof(struct fb_info) + sizeof(u32) * 17;
 412
 413         info = kmalloc(size, GFP_ATOMIC);
 414
 415         if (info == 0) {
 416                 release_mem_region(res_start, res_size);
 417                 return;
 418         }
 419         memset(info, 0, size);
 420
 421         fix = &info->fix;
 422         var = &info->var;
 423
 424         strcpy(fix->id, "OFfb ");
 425         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 426         fix->id[sizeof(fix->id) - 1] = '\0';
 427
 428         var->xres = var->xres_virtual = width;
 429         var->yres = var->yres_virtual = height;
 430         fix->line_length = pitch;
 431
 432         fix->smem_start = address;
 433         fix->smem_len = pitch * height;
 434         fix->type = FB_TYPE_PACKED_PIXELS;
 435         fix->type_aux = 0;
 436
 437         par->cmap_type = cmap_unknown;
 438         if (depth == 8) {
 439                 /* XXX kludge for ati */
 440                 if (dp && !strncmp(name, "ATY,Rage128", 11)) {
 441                         unsigned long regbase = dp->addrs[2].address;
 442                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 443                         par->cmap_type = cmap_r128;
 444                 } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
 445                                   || !strncmp(name, "ATY,RageM3p12A", 14))) {
 446                         unsigned long regbase =
 447                             dp->parent->addrs[2].address;
 448                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 449                         par->cmap_type = cmap_M3A;
 450                 } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
 451                         unsigned long regbase =
 452                             dp->parent->addrs[2].address;
 453                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 454                         par->cmap_type = cmap_M3B;
 455                 } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
 456                         unsigned long regbase = dp->addrs[1].address;
 457                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 458                         par->cmap_type = cmap_radeon;
 459                 } else if (!strncmp(name, "ATY,", 4)) {
 460                         unsigned long base = address & 0xff000000UL;
 461                         par->cmap_adr =
 462                             ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
 463                         par->cmap_data = par->cmap_adr + 1;
 464                         par->cmap_type = cmap_m64;
 465                 } else if (device_is_compatible(dp, "pci1014,b7")) {
 466                         unsigned long regbase = dp->addrs[0].address;
 467                         par->cmap_adr = ioremap(regbase + 0x6000, 0x1000);
 468                         par->cmap_type = cmap_gxt2000;
 469                 }
 470                 fix->visual = par->cmap_adr ? FB_VISUAL_PSEUDOCOLOR
 471                     : FB_VISUAL_STATIC_PSEUDOCOLOR;
 472         } else
 473                 fix->visual =   /* par->cmap_adr ? FB_VISUAL_DIRECTCOLOR
 474                                    : */ FB_VISUAL_TRUECOLOR;
 475
 476         var->xoffset = var->yoffset = 0;
 477         var->bits_per_pixel = depth;
 478         switch (depth) {
 479         case 8:
 480                 var->bits_per_pixel = 8;
 481                 var->red.offset = 0;
 482                 var->red.length = 8;
 483                 var->green.offset = 0;
 484                 var->green.length = 8;
 485                 var->blue.offset = 0;
 486                 var->blue.length = 8;
 487                 var->transp.offset = 0;
 488                 var->transp.length = 0;
 489                 break;
 490         case 16:                /* RGB 555 */
 491                 var->bits_per_pixel = 16;
 492                 var->red.offset = 10;
 493                 var->red.length = 5;
 494                 var->green.offset = 5;
 495                 var->green.length = 5;
 496                 var->blue.offset = 0;
 497                 var->blue.length = 5;
 498                 var->transp.offset = 0;
 499                 var->transp.length = 0;
 500                 break;
 501         case 32:                /* RGB 888 */
 502                 var->bits_per_pixel = 32;
 503                 var->red.offset = 16;
 504                 var->red.length = 8;
 505                 var->green.offset = 8;
 506                 var->green.length = 8;
 507                 var->blue.offset = 0;
 508                 var->blue.length = 8;
 509                 var->transp.offset = 24;
 510                 var->transp.length = 8;
 511                 break;
 512         }
 513         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 514             var->transp.msb_right = 0;
 515         var->grayscale = 0;
 516         var->nonstd = 0;
 517         var->activate = 0;
 518         var->height = var->width = -1;
 519         var->pixclock = 10000;
 520         var->left_margin = var->right_margin = 16;
 521         var->upper_margin = var->lower_margin = 16;
 522         var->hsync_len = var->vsync_len = 8;
 523         var->sync = 0;
 524         var->vmode = FB_VMODE_NONINTERLACED;
 525
 526         info->fbops = &offb_ops;
 527         info->screen_base = ioremap(address, fix->smem_len);
 528         info->par = par;
 529         info->pseudo_palette = (void *) (info + 1);
 530         info->flags = FBINFO_FLAG_DEFAULT;
 531
 532         fb_alloc_cmap(&info->cmap, 256, 0);
 533
 534         if (register_framebuffer(info) < 0) {
 535                 kfree(info);
 536                 release_mem_region(res_start, res_size);
 537                 return;
 538         }
 539
 540         printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
 541                info->node, full_name);
 542 }
 543
 544 MODULE_LICENSE("GPL");