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/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/errno.h>
  18 #include <linux/string.h>
  19 #include <linux/mm.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/delay.h>
  22 #include <linux/of.h>
  23 #include <linux/of_address.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/fb.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/pci.h>
  29 #include <asm/io.h>
  30
  31 #ifdef CONFIG_PPC64
  32 #include <asm/pci-bridge.h>
  33 #endif
  34
  35 #ifdef CONFIG_PPC32
  36 #include <asm/bootx.h>
  37 #endif
  38
  39 #include "macmodes.h"
  40
  41 /* Supported palette hacks */
  42 enum {
  43         cmap_unknown,
  44         cmap_m64,               /* ATI Mach64 */
  45         cmap_r128,              /* ATI Rage128 */
  46         cmap_M3A,               /* ATI Rage Mobility M3 Head A */
  47         cmap_M3B,               /* ATI Rage Mobility M3 Head B */
  48         cmap_radeon,            /* ATI Radeon */
  49         cmap_gxt2000,           /* IBM GXT2000 */
  50         cmap_avivo,             /* ATI R5xx */
  51 };
  52
  53 struct offb_par {
  54         volatile void __iomem *cmap_adr;
  55         volatile void __iomem *cmap_data;
  56         int cmap_type;
  57         int blanked;
  58 };
  59
  60 struct offb_par default_par;
  61
  62 #ifdef CONFIG_PPC32
  63 extern boot_infos_t *boot_infos;
  64 #endif
  65
  66 /* Definitions used by the Avivo palette hack */
  67 #define AVIVO_DC_LUT_RW_SELECT                  0x6480
  68 #define AVIVO_DC_LUT_RW_MODE                    0x6484
  69 #define AVIVO_DC_LUT_RW_INDEX                   0x6488
  70 #define AVIVO_DC_LUT_SEQ_COLOR                  0x648c
  71 #define AVIVO_DC_LUT_PWL_DATA                   0x6490
  72 #define AVIVO_DC_LUT_30_COLOR                   0x6494
  73 #define AVIVO_DC_LUT_READ_PIPE_SELECT           0x6498
  74 #define AVIVO_DC_LUT_WRITE_EN_MASK              0x649c
  75 #define AVIVO_DC_LUT_AUTOFILL                   0x64a0
  76
  77 #define AVIVO_DC_LUTA_CONTROL                   0x64c0
  78 #define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE         0x64c4
  79 #define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN        0x64c8
  80 #define AVIVO_DC_LUTA_BLACK_OFFSET_RED          0x64cc
  81 #define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE         0x64d0
  82 #define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN        0x64d4
  83 #define AVIVO_DC_LUTA_WHITE_OFFSET_RED          0x64d8
  84
  85 #define AVIVO_DC_LUTB_CONTROL                   0x6cc0
  86 #define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE         0x6cc4
  87 #define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN        0x6cc8
  88 #define AVIVO_DC_LUTB_BLACK_OFFSET_RED          0x6ccc
  89 #define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE         0x6cd0
  90 #define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN        0x6cd4
  91 #define AVIVO_DC_LUTB_WHITE_OFFSET_RED          0x6cd8
  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         int i, depth;
 104         u32 *pal = info->pseudo_palette;
 105
 106         depth = info->var.bits_per_pixel;
 107         if (depth == 16)
 108                 depth = (info->var.green.length == 5) ? 15 : 16;
 109
 110         if (regno > 255 ||
 111             (depth == 16 && regno > 63) ||
 112             (depth == 15 && regno > 31))
 113                 return 1;
 114
 115         if (regno < 16) {
 116                 switch (depth) {
 117                 case 15:
 118                         pal[regno] = (regno << 10) | (regno << 5) | regno;
 119                         break;
 120                 case 16:
 121                         pal[regno] = (regno << 11) | (regno << 5) | regno;
 122                         break;
 123                 case 24:
 124                         pal[regno] = (regno << 16) | (regno << 8) | regno;
 125                         break;
 126                 case 32:
 127                         i = (regno << 8) | regno;
 128                         pal[regno] = (i << 16) | i;
 129                         break;
 130                 }
 131         }
 132
 133         red >>= 8;
 134         green >>= 8;
 135         blue >>= 8;
 136
 137         if (!par->cmap_adr)
 138                 return 0;
 139
 140         switch (par->cmap_type) {
 141         case cmap_m64:
 142                 writeb(regno, par->cmap_adr);
 143                 writeb(red, par->cmap_data);
 144                 writeb(green, par->cmap_data);
 145                 writeb(blue, par->cmap_data);
 146                 break;
 147         case cmap_M3A:
 148                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 149                 out_le32(par->cmap_adr + 0x58,
 150                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 151         case cmap_r128:
 152                 /* Set palette index & data */
 153                 out_8(par->cmap_adr + 0xb0, regno);
 154                 out_le32(par->cmap_adr + 0xb4,
 155                          (red << 16 | green << 8 | blue));
 156                 break;
 157         case cmap_M3B:
 158                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 159                 out_le32(par->cmap_adr + 0x58,
 160                          in_le32(par->cmap_adr + 0x58) | 0x20);
 161                 /* Set palette index & data */
 162                 out_8(par->cmap_adr + 0xb0, regno);
 163                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 164                 break;
 165         case cmap_radeon:
 166                 /* Set palette index & data (could be smarter) */
 167                 out_8(par->cmap_adr + 0xb0, regno);
 168                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 169                 break;
 170         case cmap_gxt2000:
 171                 out_le32(((unsigned __iomem *) par->cmap_adr) + regno,
 172                          (red << 16 | green << 8 | blue));
 173                 break;
 174         case cmap_avivo:
 175                 /* Write to both LUTs for now */
 176                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 177                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 178                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
 179                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 180                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 181                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 182                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
 183                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 184                 break;
 185         }
 186
 187         return 0;
 188 }
 189
 190     /*
 191      *  Blank the display.
 192      */
 193
 194 static int offb_blank(int blank, struct fb_info *info)
 195 {
 196         struct offb_par *par = (struct offb_par *) info->par;
 197         int i, j;
 198
 199         if (!par->cmap_adr)
 200                 return 0;
 201
 202         if (!par->blanked)
 203                 if (!blank)
 204                         return 0;
 205
 206         par->blanked = blank;
 207
 208         if (blank)
 209                 for (i = 0; i < 256; i++) {
 210                         switch (par->cmap_type) {
 211                         case cmap_m64:
 212                                 writeb(i, par->cmap_adr);
 213                                 for (j = 0; j < 3; j++)
 214                                         writeb(0, par->cmap_data);
 215                                 break;
 216                         case cmap_M3A:
 217                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 218                                 out_le32(par->cmap_adr + 0x58,
 219                                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 220                         case cmap_r128:
 221                                 /* Set palette index & data */
 222                                 out_8(par->cmap_adr + 0xb0, i);
 223                                 out_le32(par->cmap_adr + 0xb4, 0);
 224                                 break;
 225                         case cmap_M3B:
 226                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 227                                 out_le32(par->cmap_adr + 0x58,
 228                                          in_le32(par->cmap_adr + 0x58) | 0x20);
 229                                 /* Set palette index & data */
 230                                 out_8(par->cmap_adr + 0xb0, i);
 231                                 out_le32(par->cmap_adr + 0xb4, 0);
 232                                 break;
 233                         case cmap_radeon:
 234                                 out_8(par->cmap_adr + 0xb0, i);
 235                                 out_le32(par->cmap_adr + 0xb4, 0);
 236                                 break;
 237                         case cmap_gxt2000:
 238                                 out_le32(((unsigned __iomem *) par->cmap_adr) + i,
 239                                          0);
 240                                 break;
 241                         case cmap_avivo:
 242                                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 243                                 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 244                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 245                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 246                                 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 247                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 248                                 break;
 249                         }
 250         } else
 251                 fb_set_cmap(&info->cmap, info);
 252         return 0;
 253 }
 254
 255 static int offb_set_par(struct fb_info *info)
 256 {
 257         struct offb_par *par = (struct offb_par *) info->par;
 258
 259         /* On avivo, initialize palette control */
 260         if (par->cmap_type == cmap_avivo) {
 261                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL);
 262                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE);
 263                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN);
 264                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED);
 265                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE);
 266                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN);
 267                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED);
 268                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL);
 269                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE);
 270                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN);
 271                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED);
 272                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE);
 273                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN);
 274                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED);
 275                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 276                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
 277                 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
 278                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 279                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
 280                 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
 281         }
 282         return 0;
 283 }
 284
 285 static void offb_destroy(struct fb_info *info)
 286 {
 287         if (info->screen_base)
 288                 iounmap(info->screen_base);
 289         release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
 290         framebuffer_release(info);
 291 }
 292
 293 static struct fb_ops offb_ops = {
 294         .owner          = THIS_MODULE,
 295         .fb_destroy     = offb_destroy,
 296         .fb_setcolreg   = offb_setcolreg,
 297         .fb_set_par     = offb_set_par,
 298         .fb_blank       = offb_blank,
 299         .fb_fillrect    = cfb_fillrect,
 300         .fb_copyarea    = cfb_copyarea,
 301         .fb_imageblit   = cfb_imageblit,
 302 };
 303
 304 static void __iomem *offb_map_reg(struct device_node *np, int index,
 305                                   unsigned long offset, unsigned long size)
 306 {
 307         const u32 *addrp;
 308         u64 asize, taddr;
 309         unsigned int flags;
 310
 311         addrp = of_get_pci_address(np, index, &asize, &flags);
 312         if (addrp == NULL)
 313                 addrp = of_get_address(np, index, &asize, &flags);
 314         if (addrp == NULL)
 315                 return NULL;
 316         if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
 317                 return NULL;
 318         if ((offset + size) > asize)
 319                 return NULL;
 320         taddr = of_translate_address(np, addrp);
 321         if (taddr == OF_BAD_ADDR)
 322                 return NULL;
 323         return ioremap(taddr + offset, size);
 324 }
 325
 326 static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp,
 327                                     const char *name, unsigned long address)
 328 {
 329         struct offb_par *par = (struct offb_par *) info->par;
 330
 331         if (dp && !strncmp(name, "ATY,Rage128", 11)) {
 332                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 333                 if (par->cmap_adr)
 334                         par->cmap_type = cmap_r128;
 335         } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
 336                           || !strncmp(name, "ATY,RageM3p12A", 14))) {
 337                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 338                 if (par->cmap_adr)
 339                         par->cmap_type = cmap_M3A;
 340         } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
 341                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 342                 if (par->cmap_adr)
 343                         par->cmap_type = cmap_M3B;
 344         } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
 345                 par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
 346                 if (par->cmap_adr)
 347                         par->cmap_type = cmap_radeon;
 348         } else if (!strncmp(name, "ATY,", 4)) {
 349                 unsigned long base = address & 0xff000000UL;
 350                 par->cmap_adr =
 351                         ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
 352                 par->cmap_data = par->cmap_adr + 1;
 353                 par->cmap_type = cmap_m64;
 354         } else if (dp && (of_device_is_compatible(dp, "pci1014,b7") ||
 355                           of_device_is_compatible(dp, "pci1014,21c"))) {
 356                 par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
 357                 if (par->cmap_adr)
 358                         par->cmap_type = cmap_gxt2000;
 359         } else if (dp && !strncmp(name, "vga,Display-", 12)) {
 360                 /* Look for AVIVO initialized by SLOF */
 361                 struct device_node *pciparent = of_get_parent(dp);
 362                 const u32 *vid, *did;
 363                 vid = of_get_property(pciparent, "vendor-id", NULL);
 364                 did = of_get_property(pciparent, "device-id", NULL);
 365                 /* This will match most R5xx */
 366                 if (vid && did && *vid == 0x1002 &&
 367                     ((*did >= 0x7100 && *did < 0x7800) ||
 368                      (*did >= 0x9400))) {
 369                         par->cmap_adr = offb_map_reg(pciparent, 2, 0, 0x10000);
 370                         if (par->cmap_adr)
 371                                 par->cmap_type = cmap_avivo;
 372                 }
 373                 of_node_put(pciparent);
 374         }
 375         info->fix.visual = (par->cmap_type != cmap_unknown) ?
 376                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
 377 }
 378
 379 static void __init offb_init_fb(const char *name, const char *full_name,
 380                                 int width, int height, int depth,
 381                                 int pitch, unsigned long address,
 382                                 int foreign_endian, struct device_node *dp)
 383 {
 384         unsigned long res_size = pitch * height * (depth + 7) / 8;
 385         struct offb_par *par = &default_par;
 386         unsigned long res_start = address;
 387         struct fb_fix_screeninfo *fix;
 388         struct fb_var_screeninfo *var;
 389         struct fb_info *info;
 390
 391         if (!request_mem_region(res_start, res_size, "offb"))
 392                 return;
 393
 394         printk(KERN_INFO
 395                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 396                width, height, name, address, depth, pitch);
 397         if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
 398                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
 399                        depth);
 400                 release_mem_region(res_start, res_size);
 401                 return;
 402         }
 403
 404         info = framebuffer_alloc(sizeof(u32) * 16, NULL);
 405
 406         if (info == 0) {
 407                 release_mem_region(res_start, res_size);
 408                 return;
 409         }
 410
 411         fix = &info->fix;
 412         var = &info->var;
 413         info->par = par;
 414
 415         strcpy(fix->id, "OFfb ");
 416         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 417         fix->id[sizeof(fix->id) - 1] = '\0';
 418
 419         var->xres = var->xres_virtual = width;
 420         var->yres = var->yres_virtual = height;
 421         fix->line_length = pitch;
 422
 423         fix->smem_start = address;
 424         fix->smem_len = pitch * height;
 425         fix->type = FB_TYPE_PACKED_PIXELS;
 426         fix->type_aux = 0;
 427
 428         par->cmap_type = cmap_unknown;
 429         if (depth == 8)
 430                 offb_init_palette_hacks(info, dp, name, address);
 431         else
 432                 fix->visual = FB_VISUAL_TRUECOLOR;
 433
 434         var->xoffset = var->yoffset = 0;
 435         switch (depth) {
 436         case 8:
 437                 var->bits_per_pixel = 8;
 438                 var->red.offset = 0;
 439                 var->red.length = 8;
 440                 var->green.offset = 0;
 441                 var->green.length = 8;
 442                 var->blue.offset = 0;
 443                 var->blue.length = 8;
 444                 var->transp.offset = 0;
 445                 var->transp.length = 0;
 446                 break;
 447         case 15:                /* RGB 555 */
 448                 var->bits_per_pixel = 16;
 449                 var->red.offset = 10;
 450                 var->red.length = 5;
 451                 var->green.offset = 5;
 452                 var->green.length = 5;
 453                 var->blue.offset = 0;
 454                 var->blue.length = 5;
 455                 var->transp.offset = 0;
 456                 var->transp.length = 0;
 457                 break;
 458         case 16:                /* RGB 565 */
 459                 var->bits_per_pixel = 16;
 460                 var->red.offset = 11;
 461                 var->red.length = 5;
 462                 var->green.offset = 5;
 463                 var->green.length = 6;
 464                 var->blue.offset = 0;
 465                 var->blue.length = 5;
 466                 var->transp.offset = 0;
 467                 var->transp.length = 0;
 468                 break;
 469         case 32:                /* RGB 888 */
 470                 var->bits_per_pixel = 32;
 471                 var->red.offset = 16;
 472                 var->red.length = 8;
 473                 var->green.offset = 8;
 474                 var->green.length = 8;
 475                 var->blue.offset = 0;
 476                 var->blue.length = 8;
 477                 var->transp.offset = 24;
 478                 var->transp.length = 8;
 479                 break;
 480         }
 481         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 482             var->transp.msb_right = 0;
 483         var->grayscale = 0;
 484         var->nonstd = 0;
 485         var->activate = 0;
 486         var->height = var->width = -1;
 487         var->pixclock = 10000;
 488         var->left_margin = var->right_margin = 16;
 489         var->upper_margin = var->lower_margin = 16;
 490         var->hsync_len = var->vsync_len = 8;
 491         var->sync = 0;
 492         var->vmode = FB_VMODE_NONINTERLACED;
 493
 494         /* set offb aperture size for generic probing */
 495         info->apertures = alloc_apertures(1);
 496         if (!info->apertures)
 497                 goto out_aper;
 498         info->apertures->ranges[0].base = address;
 499         info->apertures->ranges[0].size = fix->smem_len;
 500
 501         info->fbops = &offb_ops;
 502         info->screen_base = ioremap(address, fix->smem_len);
 503         info->pseudo_palette = (void *) (info + 1);
 504         info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE | foreign_endian;
 505
 506         fb_alloc_cmap(&info->cmap, 256, 0);
 507
 508         if (register_framebuffer(info) < 0)
 509                 goto out_err;
 510
 511         printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
 512                info->node, full_name);
 513         return;
 514
 515 out_err:
 516         iounmap(info->screen_base);
 517 out_aper:
 518         iounmap(par->cmap_adr);
 519         par->cmap_adr = NULL;
 520         framebuffer_release(info);
 521         release_mem_region(res_start, res_size);
 522 }
 523
 524
 525 static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
 526 {
 527         unsigned int len;
 528         int i, width = 640, height = 480, depth = 8, pitch = 640;
 529         unsigned int flags, rsize, addr_prop = 0;
 530         unsigned long max_size = 0;
 531         u64 rstart, address = OF_BAD_ADDR;
 532         const u32 *pp, *addrp, *up;
 533         u64 asize;
 534         int foreign_endian = 0;
 535
 536 #ifdef __BIG_ENDIAN
 537         if (of_get_property(dp, "little-endian", NULL))
 538                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
 539 #else
 540         if (of_get_property(dp, "big-endian", NULL))
 541                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
 542 #endif
 543
 544         pp = of_get_property(dp, "linux,bootx-depth", &len);
 545         if (pp == NULL)
 546                 pp = of_get_property(dp, "depth", &len);
 547         if (pp && len == sizeof(u32))
 548                 depth = *pp;
 549
 550         pp = of_get_property(dp, "linux,bootx-width", &len);
 551         if (pp == NULL)
 552                 pp = of_get_property(dp, "width", &len);
 553         if (pp && len == sizeof(u32))
 554                 width = *pp;
 555
 556         pp = of_get_property(dp, "linux,bootx-height", &len);
 557         if (pp == NULL)
 558                 pp = of_get_property(dp, "height", &len);
 559         if (pp && len == sizeof(u32))
 560                 height = *pp;
 561
 562         pp = of_get_property(dp, "linux,bootx-linebytes", &len);
 563         if (pp == NULL)
 564                 pp = of_get_property(dp, "linebytes", &len);
 565         if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
 566                 pitch = *pp;
 567         else
 568                 pitch = width * ((depth + 7) / 8);
 569
 570         rsize = (unsigned long)pitch * (unsigned long)height;
 571
 572         /* Ok, now we try to figure out the address of the framebuffer.
 573          *
 574          * Unfortunately, Open Firmware doesn't provide a standard way to do
 575          * so. All we can do is a dodgy heuristic that happens to work in
 576          * practice. On most machines, the "address" property contains what
 577          * we need, though not on Matrox cards found in IBM machines. What I've
 578          * found that appears to give good results is to go through the PCI
 579          * ranges and pick one that is both big enough and if possible encloses
 580          * the "address" property. If none match, we pick the biggest
 581          */
 582         up = of_get_property(dp, "linux,bootx-addr", &len);
 583         if (up == NULL)
 584                 up = of_get_property(dp, "address", &len);
 585         if (up && len == sizeof(u32))
 586                 addr_prop = *up;
 587
 588         /* Hack for when BootX is passing us */
 589         if (no_real_node)
 590                 goto skip_addr;
 591
 592         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
 593                      != NULL; i++) {
 594                 int match_addrp = 0;
 595
 596                 if (!(flags & IORESOURCE_MEM))
 597                         continue;
 598                 if (asize < rsize)
 599                         continue;
 600                 rstart = of_translate_address(dp, addrp);
 601                 if (rstart == OF_BAD_ADDR)
 602                         continue;
 603                 if (addr_prop && (rstart <= addr_prop) &&
 604                     ((rstart + asize) >= (addr_prop + rsize)))
 605                         match_addrp = 1;
 606                 if (match_addrp) {
 607                         address = addr_prop;
 608                         break;
 609                 }
 610                 if (rsize > max_size) {
 611                         max_size = rsize;
 612                         address = OF_BAD_ADDR;
 613                 }
 614
 615                 if (address == OF_BAD_ADDR)
 616                         address = rstart;
 617         }
 618  skip_addr:
 619         if (address == OF_BAD_ADDR && addr_prop)
 620                 address = (u64)addr_prop;
 621         if (address != OF_BAD_ADDR) {
 622                 /* kludge for valkyrie */
 623                 if (strcmp(dp->name, "valkyrie") == 0)
 624                         address += 0x1000;
 625                 offb_init_fb(no_real_node ? "bootx" : dp->name,
 626                              no_real_node ? "display" : dp->full_name,
 627                              width, height, depth, pitch, address,
 628                              foreign_endian, no_real_node ? NULL : dp);
 629         }
 630 }
 631
 632 static int __init offb_init(void)
 633 {
 634         struct device_node *dp = NULL, *boot_disp = NULL;
 635
 636         if (fb_get_options("offb", NULL))
 637                 return -ENODEV;
 638
 639         /* Check if we have a MacOS display without a node spec */
 640         if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {
 641                 /* The old code tried to work out which node was the MacOS
 642                  * display based on the address. I'm dropping that since the
 643                  * lack of a node spec only happens with old BootX versions
 644                  * (users can update) and with this code, they'll still get
 645                  * a display (just not the palette hacks).
 646                  */
 647                 offb_init_nodriver(of_chosen, 1);
 648         }
 649
 650         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 651                 if (of_get_property(dp, "linux,opened", NULL) &&
 652                     of_get_property(dp, "linux,boot-display", NULL)) {
 653                         boot_disp = dp;
 654                         offb_init_nodriver(dp, 0);
 655                 }
 656         }
 657         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 658                 if (of_get_property(dp, "linux,opened", NULL) &&
 659                     dp != boot_disp)
 660                         offb_init_nodriver(dp, 0);
 661         }
 662
 663         return 0;
 664 }
 665
 666
 667 module_init(offb_init);
 668 MODULE_LICENSE("GPL");