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
  32 #ifdef CONFIG_PPC32
  33 #include <asm/bootx.h>
  34 #endif
  35
  36 #include "macmodes.h"
  37
  38 /* Supported palette hacks */
  39 enum {
  40         cmap_unknown,
  41         cmap_m64,               /* ATI Mach64 */
  42         cmap_r128,              /* ATI Rage128 */
  43         cmap_M3A,               /* ATI Rage Mobility M3 Head A */
  44         cmap_M3B,               /* ATI Rage Mobility M3 Head B */
  45         cmap_radeon,            /* ATI Radeon */
  46         cmap_gxt2000,           /* IBM GXT2000 */
  47 };
  48
  49 struct offb_par {
  50         volatile unsigned char *cmap_adr;
  51         volatile unsigned char *cmap_data;
  52         int cmap_type;
  53         int blanked;
  54 };
  55
  56 struct offb_par default_par;
  57
  58 #ifdef __powerpc__
  59 #define mach_eieio()    eieio()
  60 #else
  61 #define mach_eieio()    do {} while (0)
  62 #endif
  63
  64     /*
  65      *  Interface used by the world
  66      */
  67
  68 int offb_init(void);
  69
  70 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  71                           u_int transp, struct fb_info *info);
  72 static int offb_blank(int blank, struct fb_info *info);
  73
  74 #ifdef CONFIG_PPC32
  75 extern boot_infos_t *boot_infos;
  76 #endif
  77
  78 static void offb_init_nodriver(struct device_node *);
  79 static void offb_init_fb(const char *name, const char *full_name,
  80                          int width, int height, int depth, int pitch,
  81                          unsigned long address, struct device_node *dp);
  82
  83 static struct fb_ops offb_ops = {
  84         .owner          = THIS_MODULE,
  85         .fb_setcolreg   = offb_setcolreg,
  86         .fb_blank       = offb_blank,
  87         .fb_fillrect    = cfb_fillrect,
  88         .fb_copyarea    = cfb_copyarea,
  89         .fb_imageblit   = cfb_imageblit,
  90         .fb_cursor      = soft_cursor,
  91 };
  92
  93     /*
  94      *  Set a single color register. The values supplied are already
  95      *  rounded down to the hardware's capabilities (according to the
  96      *  entries in the var structure). Return != 0 for invalid regno.
  97      */
  98
  99 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 100                           u_int transp, struct fb_info *info)
 101 {
 102         struct offb_par *par = (struct offb_par *) info->par;
 103
 104         if (!par->cmap_adr || regno > 255)
 105                 return 1;
 106
 107         red >>= 8;
 108         green >>= 8;
 109         blue >>= 8;
 110
 111         switch (par->cmap_type) {
 112         case cmap_m64:
 113                 *par->cmap_adr = regno;
 114                 mach_eieio();
 115                 *par->cmap_data = red;
 116                 mach_eieio();
 117                 *par->cmap_data = green;
 118                 mach_eieio();
 119                 *par->cmap_data = blue;
 120                 mach_eieio();
 121                 break;
 122         case cmap_M3A:
 123                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 124                 out_le32((unsigned *) (par->cmap_adr + 0x58),
 125                          in_le32((unsigned *) (par->cmap_adr +
 126                                                0x58)) & ~0x20);
 127         case cmap_r128:
 128                 /* Set palette index & data */
 129                 out_8(par->cmap_adr + 0xb0, regno);
 130                 out_le32((unsigned *) (par->cmap_adr + 0xb4),
 131                          (red << 16 | green << 8 | blue));
 132                 break;
 133         case cmap_M3B:
 134                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 135                 out_le32((unsigned *) (par->cmap_adr + 0x58),
 136                          in_le32((unsigned *) (par->cmap_adr +
 137                                                0x58)) | 0x20);
 138                 /* Set palette index & data */
 139                 out_8(par->cmap_adr + 0xb0, regno);
 140                 out_le32((unsigned *) (par->cmap_adr + 0xb4),
 141                          (red << 16 | green << 8 | blue));
 142                 break;
 143         case cmap_radeon:
 144                 /* Set palette index & data (could be smarter) */
 145                 out_8(par->cmap_adr + 0xb0, regno);
 146                 out_le32((unsigned *) (par->cmap_adr + 0xb4),
 147                          (red << 16 | green << 8 | blue));
 148                 break;
 149         case cmap_gxt2000:
 150                 out_le32((unsigned *) par->cmap_adr + regno,
 151                          (red << 16 | green << 8 | blue));
 152                 break;
 153         }
 154
 155         if (regno < 16)
 156                 switch (info->var.bits_per_pixel) {
 157                 case 16:
 158                         ((u16 *) (info->pseudo_palette))[regno] =
 159                             (regno << 10) | (regno << 5) | regno;
 160                         break;
 161                 case 32:
 162                         {
 163                                 int i = (regno << 8) | regno;
 164                                 ((u32 *) (info->pseudo_palette))[regno] =
 165                                     (i << 16) | i;
 166                                 break;
 167                         }
 168                 }
 169         return 0;
 170 }
 171
 172     /*
 173      *  Blank the display.
 174      */
 175
 176 static int offb_blank(int blank, struct fb_info *info)
 177 {
 178         struct offb_par *par = (struct offb_par *) info->par;
 179         int i, j;
 180
 181         if (!par->cmap_adr)
 182                 return 0;
 183
 184         if (!par->blanked)
 185                 if (!blank)
 186                         return 0;
 187
 188         par->blanked = blank;
 189
 190         if (blank)
 191                 for (i = 0; i < 256; i++) {
 192                         switch (par->cmap_type) {
 193                         case cmap_m64:
 194                                 *par->cmap_adr = i;
 195                                 mach_eieio();
 196                                 for (j = 0; j < 3; j++) {
 197                                         *par->cmap_data = 0;
 198                                         mach_eieio();
 199                                 }
 200                                 break;
 201                         case cmap_M3A:
 202                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 203                                 out_le32((unsigned *) (par->cmap_adr +
 204                                                        0x58),
 205                                          in_le32((unsigned *) (par->
 206                                                                cmap_adr +
 207                                                                0x58)) &
 208                                          ~0x20);
 209                         case cmap_r128:
 210                                 /* Set palette index & data */
 211                                 out_8(par->cmap_adr + 0xb0, i);
 212                                 out_le32((unsigned *) (par->cmap_adr +
 213                                                        0xb4), 0);
 214                                 break;
 215                         case cmap_M3B:
 216                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 217                                 out_le32((unsigned *) (par->cmap_adr +
 218                                                        0x58),
 219                                          in_le32((unsigned *) (par->
 220                                                                cmap_adr +
 221                                                                0x58)) |
 222                                          0x20);
 223                                 /* Set palette index & data */
 224                                 out_8(par->cmap_adr + 0xb0, i);
 225                                 out_le32((unsigned *) (par->cmap_adr +
 226                                                        0xb4), 0);
 227                                 break;
 228                         case cmap_radeon:
 229                                 out_8(par->cmap_adr + 0xb0, i);
 230                                 out_le32((unsigned *) (par->cmap_adr +
 231                                                        0xb4), 0);
 232                                 break;
 233                         case cmap_gxt2000:
 234                                 out_le32((unsigned *) par->cmap_adr + i,
 235                                          0);
 236                                 break;
 237                         }
 238         } else
 239                 fb_set_cmap(&info->cmap, info);
 240         return 0;
 241 }
 242
 243     /*
 244      *  Initialisation
 245      */
 246
 247 int __init offb_init(void)
 248 {
 249         struct device_node *dp = NULL, *boot_disp = NULL;
 250 #if defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32)
 251         struct device_node *macos_display = NULL;
 252 #endif
 253         if (fb_get_options("offb", NULL))
 254                 return -ENODEV;
 255
 256 #if defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32)
 257         /* If we're booted from BootX... */
 258         if (boot_infos != 0) {
 259                 unsigned long addr =
 260                     (unsigned long) boot_infos->dispDeviceBase;
 261                 /* find the device node corresponding to the macos display */
 262                 while ((dp = of_find_node_by_type(dp, "display"))) {
 263                         int i;
 264                         /*
 265                          * Grrr...  It looks like the MacOS ATI driver
 266                          * munges the assigned-addresses property (but
 267                          * the AAPL,address value is OK).
 268                          */
 269                         if (strncmp(dp->name, "ATY,", 4) == 0
 270                             && dp->n_addrs == 1) {
 271                                 unsigned int *ap =
 272                                     (unsigned int *) get_property(dp,
 273                                                                   "AAPL,address",
 274                                                                   NULL);
 275                                 if (ap != NULL) {
 276                                         dp->addrs[0].address = *ap;
 277                                         dp->addrs[0].size = 0x01000000;
 278                                 }
 279                         }
 280
 281                         /*
 282                          * The LTPro on the Lombard powerbook has no addresses
 283                          * on the display nodes, they are on their parent.
 284                          */
 285                         if (dp->n_addrs == 0
 286                             && device_is_compatible(dp, "ATY,264LTPro")) {
 287                                 int na;
 288                                 unsigned int *ap = (unsigned int *)
 289                                     get_property(dp, "AAPL,address", &na);
 290                                 if (ap != 0)
 291                                         for (na /= sizeof(unsigned int);
 292                                              na > 0; --na, ++ap)
 293                                                 if (*ap <= addr
 294                                                     && addr <
 295                                                     *ap + 0x1000000)
 296                                                         goto foundit;
 297                         }
 298
 299                         /*
 300                          * See if the display address is in one of the address
 301                          * ranges for this display.
 302                          */
 303                         for (i = 0; i < dp->n_addrs; ++i) {
 304                                 if (dp->addrs[i].address <= addr
 305                                     && addr <
 306                                     dp->addrs[i].address +
 307                                     dp->addrs[i].size)
 308                                         break;
 309                         }
 310                         if (i < dp->n_addrs) {
 311                               foundit:
 312                                 printk(KERN_INFO "MacOS display is %s\n",
 313                                        dp->full_name);
 314                                 macos_display = dp;
 315                                 break;
 316                         }
 317                 }
 318
 319                 /* initialize it */
 320                 offb_init_fb(macos_display ? macos_display->
 321                              name : "MacOS display",
 322                              macos_display ? macos_display->
 323                              full_name : "MacOS display",
 324                              boot_infos->dispDeviceRect[2],
 325                              boot_infos->dispDeviceRect[3],
 326                              boot_infos->dispDeviceDepth,
 327                              boot_infos->dispDeviceRowBytes, addr, NULL);
 328         }
 329 #endif /* defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32) */
 330
 331         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 332                 if (get_property(dp, "linux,opened", NULL) &&
 333                     get_property(dp, "linux,boot-display", NULL)) {
 334                         boot_disp = dp;
 335                         offb_init_nodriver(dp);
 336                 }
 337         }
 338         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 339                 if (get_property(dp, "linux,opened", NULL) &&
 340                     dp != boot_disp)
 341                         offb_init_nodriver(dp);
 342         }
 343
 344         return 0;
 345 }
 346
 347
 348 static void __init offb_init_nodriver(struct device_node *dp)
 349 {
 350         int *pp, i;
 351         unsigned int len;
 352         int width = 640, height = 480, depth = 8, pitch;
 353         unsigned *up, address;
 354
 355         if ((pp = (int *) get_property(dp, "depth", &len)) != NULL
 356             && len == sizeof(int))
 357                 depth = *pp;
 358         if ((pp = (int *) get_property(dp, "width", &len)) != NULL
 359             && len == sizeof(int))
 360                 width = *pp;
 361         if ((pp = (int *) get_property(dp, "height", &len)) != NULL
 362             && len == sizeof(int))
 363                 height = *pp;
 364         if ((pp = (int *) get_property(dp, "linebytes", &len)) != NULL
 365             && len == sizeof(int)) {
 366                 pitch = *pp;
 367                 if (pitch == 1)
 368                         pitch = 0x1000;
 369         } else
 370                 pitch = width;
 371         if ((up = (unsigned *) get_property(dp, "address", &len)) != NULL
 372             && len == sizeof(unsigned))
 373                 address = (u_long) * up;
 374         else {
 375                 for (i = 0; i < dp->n_addrs; ++i)
 376                         if (dp->addrs[i].size >=
 377                             pitch * height * depth / 8)
 378                                 break;
 379                 if (i >= dp->n_addrs) {
 380                         printk(KERN_ERR
 381                                "no framebuffer address found for %s\n",
 382                                dp->full_name);
 383                         return;
 384                 }
 385
 386                 address = (u_long) dp->addrs[i].address;
 387
 388                 /* kludge for valkyrie */
 389                 if (strcmp(dp->name, "valkyrie") == 0)
 390                         address += 0x1000;
 391         }
 392         offb_init_fb(dp->name, dp->full_name, width, height, depth,
 393                      pitch, address, dp);
 394
 395 }
 396
 397 static void __init offb_init_fb(const char *name, const char *full_name,
 398                                 int width, int height, int depth,
 399                                 int pitch, unsigned long address,
 400                                 struct device_node *dp)
 401 {
 402         unsigned long res_size = pitch * height * depth / 8;
 403         struct offb_par *par = &default_par;
 404         unsigned long res_start = address;
 405         struct fb_fix_screeninfo *fix;
 406         struct fb_var_screeninfo *var;
 407         struct fb_info *info;
 408         int size;
 409
 410         if (!request_mem_region(res_start, res_size, "offb"))
 411                 return;
 412
 413         printk(KERN_INFO
 414                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 415                width, height, name, address, depth, pitch);
 416         if (depth != 8 && depth != 16 && depth != 32) {
 417                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
 418                        depth);
 419                 release_mem_region(res_start, res_size);
 420                 return;
 421         }
 422
 423         size = sizeof(struct fb_info) + sizeof(u32) * 17;
 424
 425         info = kmalloc(size, GFP_ATOMIC);
 426
 427         if (info == 0) {
 428                 release_mem_region(res_start, res_size);
 429                 return;
 430         }
 431         memset(info, 0, size);
 432
 433         fix = &info->fix;
 434         var = &info->var;
 435
 436         strcpy(fix->id, "OFfb ");
 437         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 438         fix->id[sizeof(fix->id) - 1] = '\0';
 439
 440         var->xres = var->xres_virtual = width;
 441         var->yres = var->yres_virtual = height;
 442         fix->line_length = pitch;
 443
 444         fix->smem_start = address;
 445         fix->smem_len = pitch * height;
 446         fix->type = FB_TYPE_PACKED_PIXELS;
 447         fix->type_aux = 0;
 448
 449         par->cmap_type = cmap_unknown;
 450         if (depth == 8) {
 451                 /* XXX kludge for ati */
 452                 if (dp && !strncmp(name, "ATY,Rage128", 11)) {
 453                         unsigned long regbase = dp->addrs[2].address;
 454                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 455                         par->cmap_type = cmap_r128;
 456                 } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
 457                                   || !strncmp(name, "ATY,RageM3p12A", 14))) {
 458                         unsigned long regbase =
 459                             dp->parent->addrs[2].address;
 460                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 461                         par->cmap_type = cmap_M3A;
 462                 } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
 463                         unsigned long regbase =
 464                             dp->parent->addrs[2].address;
 465                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 466                         par->cmap_type = cmap_M3B;
 467                 } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
 468                         unsigned long regbase = dp->addrs[1].address;
 469                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 470                         par->cmap_type = cmap_radeon;
 471                 } else if (!strncmp(name, "ATY,", 4)) {
 472                         unsigned long base = address & 0xff000000UL;
 473                         par->cmap_adr =
 474                             ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
 475                         par->cmap_data = par->cmap_adr + 1;
 476                         par->cmap_type = cmap_m64;
 477                 } else if (device_is_compatible(dp, "pci1014,b7")) {
 478                         unsigned long regbase = dp->addrs[0].address;
 479                         par->cmap_adr = ioremap(regbase + 0x6000, 0x1000);
 480                         par->cmap_type = cmap_gxt2000;
 481                 }
 482                 fix->visual = par->cmap_adr ? FB_VISUAL_PSEUDOCOLOR
 483                     : FB_VISUAL_STATIC_PSEUDOCOLOR;
 484         } else
 485                 fix->visual =   /* par->cmap_adr ? FB_VISUAL_DIRECTCOLOR
 486                                    : */ FB_VISUAL_TRUECOLOR;
 487
 488         var->xoffset = var->yoffset = 0;
 489         var->bits_per_pixel = depth;
 490         switch (depth) {
 491         case 8:
 492                 var->bits_per_pixel = 8;
 493                 var->red.offset = 0;
 494                 var->red.length = 8;
 495                 var->green.offset = 0;
 496                 var->green.length = 8;
 497                 var->blue.offset = 0;
 498                 var->blue.length = 8;
 499                 var->transp.offset = 0;
 500                 var->transp.length = 0;
 501                 break;
 502         case 16:                /* RGB 555 */
 503                 var->bits_per_pixel = 16;
 504                 var->red.offset = 10;
 505                 var->red.length = 5;
 506                 var->green.offset = 5;
 507                 var->green.length = 5;
 508                 var->blue.offset = 0;
 509                 var->blue.length = 5;
 510                 var->transp.offset = 0;
 511                 var->transp.length = 0;
 512                 break;
 513         case 32:                /* RGB 888 */
 514                 var->bits_per_pixel = 32;
 515                 var->red.offset = 16;
 516                 var->red.length = 8;
 517                 var->green.offset = 8;
 518                 var->green.length = 8;
 519                 var->blue.offset = 0;
 520                 var->blue.length = 8;
 521                 var->transp.offset = 24;
 522                 var->transp.length = 8;
 523                 break;
 524         }
 525         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 526             var->transp.msb_right = 0;
 527         var->grayscale = 0;
 528         var->nonstd = 0;
 529         var->activate = 0;
 530         var->height = var->width = -1;
 531         var->pixclock = 10000;
 532         var->left_margin = var->right_margin = 16;
 533         var->upper_margin = var->lower_margin = 16;
 534         var->hsync_len = var->vsync_len = 8;
 535         var->sync = 0;
 536         var->vmode = FB_VMODE_NONINTERLACED;
 537
 538         info->fbops = &offb_ops;
 539         info->screen_base = ioremap(address, fix->smem_len);
 540         info->par = par;
 541         info->pseudo_palette = (void *) (info + 1);
 542         info->flags = FBINFO_DEFAULT;
 543
 544         fb_alloc_cmap(&info->cmap, 256, 0);
 545
 546         if (register_framebuffer(info) < 0) {
 547                 kfree(info);
 548                 release_mem_region(res_start, res_size);
 549                 return;
 550         }
 551
 552         printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
 553                info->node, full_name);
 554 }
 555
 556 module_init(offb_init);
 557 MODULE_LICENSE("GPL");