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/slab.h>
  21 #include <linux/vmalloc.h>
  22 #include <linux/delay.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/fb.h>
  25 #include <linux/init.h>
  26 #include <linux/ioport.h>
  27 #include <linux/pci.h>
  28 #include <asm/io.h>
  29 #include <asm/prom.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 struct fb_ops offb_ops = {
 286         .owner          = THIS_MODULE,
 287         .fb_setcolreg   = offb_setcolreg,
 288         .fb_set_par     = offb_set_par,
 289         .fb_blank       = offb_blank,
 290         .fb_fillrect    = cfb_fillrect,
 291         .fb_copyarea    = cfb_copyarea,
 292         .fb_imageblit   = cfb_imageblit,
 293 };
 294
 295 static void __iomem *offb_map_reg(struct device_node *np, int index,
 296                                   unsigned long offset, unsigned long size)
 297 {
 298         const u32 *addrp;
 299         u64 asize, taddr;
 300         unsigned int flags;
 301
 302         addrp = of_get_pci_address(np, index, &asize, &flags);
 303         if (addrp == NULL)
 304                 addrp = of_get_address(np, index, &asize, &flags);
 305         if (addrp == NULL)
 306                 return NULL;
 307         if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
 308                 return NULL;
 309         if ((offset + size) > asize)
 310                 return NULL;
 311         taddr = of_translate_address(np, addrp);
 312         if (taddr == OF_BAD_ADDR)
 313                 return NULL;
 314         return ioremap(taddr + offset, size);
 315 }
 316
 317 static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp,
 318                                     const char *name, unsigned long address)
 319 {
 320         struct offb_par *par = (struct offb_par *) info->par;
 321
 322         if (dp && !strncmp(name, "ATY,Rage128", 11)) {
 323                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 324                 if (par->cmap_adr)
 325                         par->cmap_type = cmap_r128;
 326         } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
 327                           || !strncmp(name, "ATY,RageM3p12A", 14))) {
 328                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 329                 if (par->cmap_adr)
 330                         par->cmap_type = cmap_M3A;
 331         } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
 332                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 333                 if (par->cmap_adr)
 334                         par->cmap_type = cmap_M3B;
 335         } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
 336                 par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
 337                 if (par->cmap_adr)
 338                         par->cmap_type = cmap_radeon;
 339         } else if (!strncmp(name, "ATY,", 4)) {
 340                 unsigned long base = address & 0xff000000UL;
 341                 par->cmap_adr =
 342                         ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
 343                 par->cmap_data = par->cmap_adr + 1;
 344                 par->cmap_type = cmap_m64;
 345         } else if (dp && (of_device_is_compatible(dp, "pci1014,b7") ||
 346                           of_device_is_compatible(dp, "pci1014,21c"))) {
 347                 par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
 348                 if (par->cmap_adr)
 349                         par->cmap_type = cmap_gxt2000;
 350         } else if (dp && !strncmp(name, "vga,Display-", 12)) {
 351                 /* Look for AVIVO initialized by SLOF */
 352                 struct device_node *pciparent = of_get_parent(dp);
 353                 const u32 *vid, *did;
 354                 vid = of_get_property(pciparent, "vendor-id", NULL);
 355                 did = of_get_property(pciparent, "device-id", NULL);
 356                 /* This will match most R5xx */
 357                 if (vid && did && *vid == 0x1002 &&
 358                     ((*did >= 0x7100 && *did < 0x7800) ||
 359                      (*did >= 0x9400))) {
 360                         par->cmap_adr = offb_map_reg(pciparent, 2, 0, 0x10000);
 361                         if (par->cmap_adr)
 362                                 par->cmap_type = cmap_avivo;
 363                 }
 364                 of_node_put(pciparent);
 365         }
 366         info->fix.visual = (par->cmap_type != cmap_unknown) ?
 367                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
 368 }
 369
 370 static void __init offb_init_fb(const char *name, const char *full_name,
 371                                 int width, int height, int depth,
 372                                 int pitch, unsigned long address,
 373                                 int foreign_endian, struct device_node *dp)
 374 {
 375         unsigned long res_size = pitch * height * (depth + 7) / 8;
 376         struct offb_par *par = &default_par;
 377         unsigned long res_start = address;
 378         struct fb_fix_screeninfo *fix;
 379         struct fb_var_screeninfo *var;
 380         struct fb_info *info;
 381         int size;
 382
 383         if (!request_mem_region(res_start, res_size, "offb"))
 384                 return;
 385
 386         printk(KERN_INFO
 387                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 388                width, height, name, address, depth, pitch);
 389         if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
 390                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
 391                        depth);
 392                 release_mem_region(res_start, res_size);
 393                 return;
 394         }
 395
 396         size = sizeof(struct fb_info) + sizeof(u32) * 16;
 397
 398         info = kmalloc(size, GFP_ATOMIC);
 399
 400         if (info == 0) {
 401                 release_mem_region(res_start, res_size);
 402                 return;
 403         }
 404         memset(info, 0, size);
 405
 406         fix = &info->fix;
 407         var = &info->var;
 408         info->par = par;
 409
 410         strcpy(fix->id, "OFfb ");
 411         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 412         fix->id[sizeof(fix->id) - 1] = '\0';
 413
 414         var->xres = var->xres_virtual = width;
 415         var->yres = var->yres_virtual = height;
 416         fix->line_length = pitch;
 417
 418         fix->smem_start = address;
 419         fix->smem_len = pitch * height;
 420         fix->type = FB_TYPE_PACKED_PIXELS;
 421         fix->type_aux = 0;
 422
 423         par->cmap_type = cmap_unknown;
 424         if (depth == 8)
 425                 offb_init_palette_hacks(info, dp, name, address);
 426         else
 427                 fix->visual = FB_VISUAL_TRUECOLOR;
 428
 429         var->xoffset = var->yoffset = 0;
 430         switch (depth) {
 431         case 8:
 432                 var->bits_per_pixel = 8;
 433                 var->red.offset = 0;
 434                 var->red.length = 8;
 435                 var->green.offset = 0;
 436                 var->green.length = 8;
 437                 var->blue.offset = 0;
 438                 var->blue.length = 8;
 439                 var->transp.offset = 0;
 440                 var->transp.length = 0;
 441                 break;
 442         case 15:                /* RGB 555 */
 443                 var->bits_per_pixel = 16;
 444                 var->red.offset = 10;
 445                 var->red.length = 5;
 446                 var->green.offset = 5;
 447                 var->green.length = 5;
 448                 var->blue.offset = 0;
 449                 var->blue.length = 5;
 450                 var->transp.offset = 0;
 451                 var->transp.length = 0;
 452                 break;
 453         case 16:                /* RGB 565 */
 454                 var->bits_per_pixel = 16;
 455                 var->red.offset = 11;
 456                 var->red.length = 5;
 457                 var->green.offset = 5;
 458                 var->green.length = 6;
 459                 var->blue.offset = 0;
 460                 var->blue.length = 5;
 461                 var->transp.offset = 0;
 462                 var->transp.length = 0;
 463                 break;
 464         case 32:                /* RGB 888 */
 465                 var->bits_per_pixel = 32;
 466                 var->red.offset = 16;
 467                 var->red.length = 8;
 468                 var->green.offset = 8;
 469                 var->green.length = 8;
 470                 var->blue.offset = 0;
 471                 var->blue.length = 8;
 472                 var->transp.offset = 24;
 473                 var->transp.length = 8;
 474                 break;
 475         }
 476         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 477             var->transp.msb_right = 0;
 478         var->grayscale = 0;
 479         var->nonstd = 0;
 480         var->activate = 0;
 481         var->height = var->width = -1;
 482         var->pixclock = 10000;
 483         var->left_margin = var->right_margin = 16;
 484         var->upper_margin = var->lower_margin = 16;
 485         var->hsync_len = var->vsync_len = 8;
 486         var->sync = 0;
 487         var->vmode = FB_VMODE_NONINTERLACED;
 488
 489         info->fbops = &offb_ops;
 490         info->screen_base = ioremap(address, fix->smem_len);
 491         info->pseudo_palette = (void *) (info + 1);
 492         info->flags = FBINFO_DEFAULT | foreign_endian;
 493
 494         fb_alloc_cmap(&info->cmap, 256, 0);
 495
 496         if (register_framebuffer(info) < 0) {
 497                 iounmap(par->cmap_adr);
 498                 par->cmap_adr = NULL;
 499                 iounmap(info->screen_base);
 500                 kfree(info);
 501                 release_mem_region(res_start, res_size);
 502                 return;
 503         }
 504
 505         printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
 506                info->node, full_name);
 507 }
 508
 509
 510 static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
 511 {
 512         unsigned int len;
 513         int i, width = 640, height = 480, depth = 8, pitch = 640;
 514         unsigned int flags, rsize, addr_prop = 0;
 515         unsigned long max_size = 0;
 516         u64 rstart, address = OF_BAD_ADDR;
 517         const u32 *pp, *addrp, *up;
 518         u64 asize;
 519         int foreign_endian = 0;
 520
 521 #ifdef __BIG_ENDIAN
 522         if (of_get_property(dp, "little-endian", NULL))
 523                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
 524 #else
 525         if (of_get_property(dp, "big-endian", NULL))
 526                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
 527 #endif
 528
 529         pp = of_get_property(dp, "linux,bootx-depth", &len);
 530         if (pp == NULL)
 531                 pp = of_get_property(dp, "depth", &len);
 532         if (pp && len == sizeof(u32))
 533                 depth = *pp;
 534
 535         pp = of_get_property(dp, "linux,bootx-width", &len);
 536         if (pp == NULL)
 537                 pp = of_get_property(dp, "width", &len);
 538         if (pp && len == sizeof(u32))
 539                 width = *pp;
 540
 541         pp = of_get_property(dp, "linux,bootx-height", &len);
 542         if (pp == NULL)
 543                 pp = of_get_property(dp, "height", &len);
 544         if (pp && len == sizeof(u32))
 545                 height = *pp;
 546
 547         pp = of_get_property(dp, "linux,bootx-linebytes", &len);
 548         if (pp == NULL)
 549                 pp = of_get_property(dp, "linebytes", &len);
 550         if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
 551                 pitch = *pp;
 552         else
 553                 pitch = width * ((depth + 7) / 8);
 554
 555         rsize = (unsigned long)pitch * (unsigned long)height;
 556
 557         /* Ok, now we try to figure out the address of the framebuffer.
 558          *
 559          * Unfortunately, Open Firmware doesn't provide a standard way to do
 560          * so. All we can do is a dodgy heuristic that happens to work in
 561          * practice. On most machines, the "address" property contains what
 562          * we need, though not on Matrox cards found in IBM machines. What I've
 563          * found that appears to give good results is to go through the PCI
 564          * ranges and pick one that is both big enough and if possible encloses
 565          * the "address" property. If none match, we pick the biggest
 566          */
 567         up = of_get_property(dp, "linux,bootx-addr", &len);
 568         if (up == NULL)
 569                 up = of_get_property(dp, "address", &len);
 570         if (up && len == sizeof(u32))
 571                 addr_prop = *up;
 572
 573         /* Hack for when BootX is passing us */
 574         if (no_real_node)
 575                 goto skip_addr;
 576
 577         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
 578                      != NULL; i++) {
 579                 int match_addrp = 0;
 580
 581                 if (!(flags & IORESOURCE_MEM))
 582                         continue;
 583                 if (asize < rsize)
 584                         continue;
 585                 rstart = of_translate_address(dp, addrp);
 586                 if (rstart == OF_BAD_ADDR)
 587                         continue;
 588                 if (addr_prop && (rstart <= addr_prop) &&
 589                     ((rstart + asize) >= (addr_prop + rsize)))
 590                         match_addrp = 1;
 591                 if (match_addrp) {
 592                         address = addr_prop;
 593                         break;
 594                 }
 595                 if (rsize > max_size) {
 596                         max_size = rsize;
 597                         address = OF_BAD_ADDR;
 598                 }
 599
 600                 if (address == OF_BAD_ADDR)
 601                         address = rstart;
 602         }
 603  skip_addr:
 604         if (address == OF_BAD_ADDR && addr_prop)
 605                 address = (u64)addr_prop;
 606         if (address != OF_BAD_ADDR) {
 607                 /* kludge for valkyrie */
 608                 if (strcmp(dp->name, "valkyrie") == 0)
 609                         address += 0x1000;
 610                 offb_init_fb(no_real_node ? "bootx" : dp->name,
 611                              no_real_node ? "display" : dp->full_name,
 612                              width, height, depth, pitch, address,
 613                              foreign_endian, no_real_node ? NULL : dp);
 614         }
 615 }
 616
 617 static int __init offb_init(void)
 618 {
 619         struct device_node *dp = NULL, *boot_disp = NULL;
 620
 621         if (fb_get_options("offb", NULL))
 622                 return -ENODEV;
 623
 624         /* Check if we have a MacOS display without a node spec */
 625         if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {
 626                 /* The old code tried to work out which node was the MacOS
 627                  * display based on the address. I'm dropping that since the
 628                  * lack of a node spec only happens with old BootX versions
 629                  * (users can update) and with this code, they'll still get
 630                  * a display (just not the palette hacks).
 631                  */
 632                 offb_init_nodriver(of_chosen, 1);
 633         }
 634
 635         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 636                 if (of_get_property(dp, "linux,opened", NULL) &&
 637                     of_get_property(dp, "linux,boot-display", NULL)) {
 638                         boot_disp = dp;
 639                         offb_init_nodriver(dp, 0);
 640                 }
 641         }
 642         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 643                 if (of_get_property(dp, "linux,opened", NULL) &&
 644                     dp != boot_disp)
 645                         offb_init_nodriver(dp, 0);
 646         }
 647
 648         return 0;
 649 }
 650
 651
 652 module_init(offb_init);
 653 MODULE_LICENSE("GPL");