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