SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/interrupt.h>
  23 #include <linux/fb.h>
  24 #include <linux/init.h>
  25 #include <linux/ioport.h>
  26 #include <linux/pci.h>
  27 #include <asm/io.h>
  28 #include <asm/prom.h>
  29
  30 #ifdef CONFIG_PPC64
  31 #include <asm/pci-bridge.h>
  32 #endif
  33
  34 #ifdef CONFIG_PPC32
  35 #include <asm/bootx.h>
  36 #endif
  37
  38 #include "macmodes.h"
  39
  40 /* Supported palette hacks */
  41 enum {
  42         cmap_unknown,
  43         cmap_m64,               /* ATI Mach64 */
  44         cmap_r128,              /* ATI Rage128 */
  45         cmap_M3A,               /* ATI Rage Mobility M3 Head A */
  46         cmap_M3B,               /* ATI Rage Mobility M3 Head B */
  47         cmap_radeon,            /* ATI Radeon */
  48         cmap_gxt2000,           /* IBM GXT2000 */
  49         cmap_avivo,             /* ATI R5xx */
  50 };
  51
  52 struct offb_par {
  53         volatile void __iomem *cmap_adr;
  54         volatile void __iomem *cmap_data;
  55         int cmap_type;
  56         int blanked;
  57 };
  58
  59 struct offb_par default_par;
  60
  61 #ifdef CONFIG_PPC32
  62 extern boot_infos_t *boot_infos;
  63 #endif
  64
  65 /* Definitions used by the Avivo palette hack */
  66 #define AVIVO_DC_LUT_RW_SELECT                  0x6480
  67 #define AVIVO_DC_LUT_RW_MODE                    0x6484
  68 #define AVIVO_DC_LUT_RW_INDEX                   0x6488
  69 #define AVIVO_DC_LUT_SEQ_COLOR                  0x648c
  70 #define AVIVO_DC_LUT_PWL_DATA                   0x6490
  71 #define AVIVO_DC_LUT_30_COLOR                   0x6494
  72 #define AVIVO_DC_LUT_READ_PIPE_SELECT           0x6498
  73 #define AVIVO_DC_LUT_WRITE_EN_MASK              0x649c
  74 #define AVIVO_DC_LUT_AUTOFILL                   0x64a0
  75
  76 #define AVIVO_DC_LUTA_CONTROL                   0x64c0
  77 #define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE         0x64c4
  78 #define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN        0x64c8
  79 #define AVIVO_DC_LUTA_BLACK_OFFSET_RED          0x64cc
  80 #define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE         0x64d0
  81 #define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN        0x64d4
  82 #define AVIVO_DC_LUTA_WHITE_OFFSET_RED          0x64d8
  83
  84 #define AVIVO_DC_LUTB_CONTROL                   0x6cc0
  85 #define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE         0x6cc4
  86 #define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN        0x6cc8
  87 #define AVIVO_DC_LUTB_BLACK_OFFSET_RED          0x6ccc
  88 #define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE         0x6cd0
  89 #define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN        0x6cd4
  90 #define AVIVO_DC_LUTB_WHITE_OFFSET_RED          0x6cd8
  91
  92     /*
  93      *  Set a single color register. The values supplied are already
  94      *  rounded down to the hardware's capabilities (according to the
  95      *  entries in the var structure). Return != 0 for invalid regno.
  96      */
  97
  98 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  99                           u_int transp, struct fb_info *info)
 100 {
 101         struct offb_par *par = (struct offb_par *) info->par;
 102         int i, depth;
 103         u32 *pal = info->pseudo_palette;
 104
 105         depth = info->var.bits_per_pixel;
 106         if (depth == 16)
 107                 depth = (info->var.green.length == 5) ? 15 : 16;
 108
 109         if (regno > 255 ||
 110             (depth == 16 && regno > 63) ||
 111             (depth == 15 && regno > 31))
 112                 return 1;
 113
 114         if (regno < 16) {
 115                 switch (depth) {
 116                 case 15:
 117                         pal[regno] = (regno << 10) | (regno << 5) | regno;
 118                         break;
 119                 case 16:
 120                         pal[regno] = (regno << 11) | (regno << 5) | regno;
 121                         break;
 122                 case 24:
 123                         pal[regno] = (regno << 16) | (regno << 8) | regno;
 124                         break;
 125                 case 32:
 126                         i = (regno << 8) | regno;
 127                         pal[regno] = (i << 16) | i;
 128                         break;
 129                 }
 130         }
 131
 132         red >>= 8;
 133         green >>= 8;
 134         blue >>= 8;
 135
 136         if (!par->cmap_adr)
 137                 return 0;
 138
 139         switch (par->cmap_type) {
 140         case cmap_m64:
 141                 writeb(regno, par->cmap_adr);
 142                 writeb(red, par->cmap_data);
 143                 writeb(green, par->cmap_data);
 144                 writeb(blue, par->cmap_data);
 145                 break;
 146         case cmap_M3A:
 147                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 148                 out_le32(par->cmap_adr + 0x58,
 149                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 150         case cmap_r128:
 151                 /* Set palette index & data */
 152                 out_8(par->cmap_adr + 0xb0, regno);
 153                 out_le32(par->cmap_adr + 0xb4,
 154                          (red << 16 | green << 8 | blue));
 155                 break;
 156         case cmap_M3B:
 157                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 158                 out_le32(par->cmap_adr + 0x58,
 159                          in_le32(par->cmap_adr + 0x58) | 0x20);
 160                 /* Set palette index & data */
 161                 out_8(par->cmap_adr + 0xb0, regno);
 162                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 163                 break;
 164         case cmap_radeon:
 165                 /* Set palette index & data (could be smarter) */
 166                 out_8(par->cmap_adr + 0xb0, regno);
 167                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 168                 break;
 169         case cmap_gxt2000:
 170                 out_le32(((unsigned __iomem *) par->cmap_adr) + regno,
 171                          (red << 16 | green << 8 | blue));
 172                 break;
 173         case cmap_avivo:
 174                 /* Write to both LUTs for now */
 175                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 176                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 177                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
 178                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 179                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 180                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 181                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
 182                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 183                 break;
 184         }
 185
 186         return 0;
 187 }
 188
 189     /*
 190      *  Blank the display.
 191      */
 192
 193 static int offb_blank(int blank, struct fb_info *info)
 194 {
 195         struct offb_par *par = (struct offb_par *) info->par;
 196         int i, j;
 197
 198         if (!par->cmap_adr)
 199                 return 0;
 200
 201         if (!par->blanked)
 202                 if (!blank)
 203                         return 0;
 204
 205         par->blanked = blank;
 206
 207         if (blank)
 208                 for (i = 0; i < 256; i++) {
 209                         switch (par->cmap_type) {
 210                         case cmap_m64:
 211                                 writeb(i, par->cmap_adr);
 212                                 for (j = 0; j < 3; j++)
 213                                         writeb(0, par->cmap_data);
 214                                 break;
 215                         case cmap_M3A:
 216                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 217                                 out_le32(par->cmap_adr + 0x58,
 218                                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 219                         case cmap_r128:
 220                                 /* Set palette index & data */
 221                                 out_8(par->cmap_adr + 0xb0, i);
 222                                 out_le32(par->cmap_adr + 0xb4, 0);
 223                                 break;
 224                         case cmap_M3B:
 225                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 226                                 out_le32(par->cmap_adr + 0x58,
 227                                          in_le32(par->cmap_adr + 0x58) | 0x20);
 228                                 /* Set palette index & data */
 229                                 out_8(par->cmap_adr + 0xb0, i);
 230                                 out_le32(par->cmap_adr + 0xb4, 0);
 231                                 break;
 232                         case cmap_radeon:
 233                                 out_8(par->cmap_adr + 0xb0, i);
 234                                 out_le32(par->cmap_adr + 0xb4, 0);
 235                                 break;
 236                         case cmap_gxt2000:
 237                                 out_le32(((unsigned __iomem *) par->cmap_adr) + i,
 238                                          0);
 239                                 break;
 240                         case cmap_avivo:
 241                                 writel(1, 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                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 245                                 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 246                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 247                                 break;
 248                         }
 249         } else
 250                 fb_set_cmap(&info->cmap, info);
 251         return 0;
 252 }
 253
 254 static int offb_set_par(struct fb_info *info)
 255 {
 256         struct offb_par *par = (struct offb_par *) info->par;
 257
 258         /* On avivo, initialize palette control */
 259         if (par->cmap_type == cmap_avivo) {
 260                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL);
 261                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE);
 262                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN);
 263                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED);
 264                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE);
 265                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN);
 266                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED);
 267                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL);
 268                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE);
 269                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN);
 270                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED);
 271                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE);
 272                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN);
 273                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED);
 274                 writel(1, 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                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 278                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
 279                 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
 280         }
 281         return 0;
 282 }
 283
 284 static void offb_destroy(struct fb_info *info)
 285 {
 286         if (info->screen_base)
 287                 iounmap(info->screen_base);
 288         release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
 289         framebuffer_release(info);
 290 }
 291
 292 static struct fb_ops offb_ops = {
 293         .owner          = THIS_MODULE,
 294         .fb_destroy     = offb_destroy,
 295         .fb_setcolreg   = offb_setcolreg,
 296         .fb_set_par     = offb_set_par,
 297         .fb_blank       = offb_blank,
 298         .fb_fillrect    = cfb_fillrect,
 299         .fb_copyarea    = cfb_copyarea,
 300         .fb_imageblit   = cfb_imageblit,
 301 };
 302
 303 static void __iomem *offb_map_reg(struct device_node *np, int index,
 304                                   unsigned long offset, unsigned long size)
 305 {
 306         const u32 *addrp;
 307         u64 asize, taddr;
 308         unsigned int flags;
 309
 310         addrp = of_get_pci_address(np, index, &asize, &flags);
 311         if (addrp == NULL)
 312                 addrp = of_get_address(np, index, &asize, &flags);
 313         if (addrp == NULL)
 314                 return NULL;
 315         if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
 316                 return NULL;
 317         if ((offset + size) > asize)
 318                 return NULL;
 319         taddr = of_translate_address(np, addrp);
 320         if (taddr == OF_BAD_ADDR)
 321                 return NULL;
 322         return ioremap(taddr + offset, size);
 323 }
 324
 325 static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp,
 326                                     const char *name, unsigned long address)
 327 {
 328         struct offb_par *par = (struct offb_par *) info->par;
 329
 330         if (dp && !strncmp(name, "ATY,Rage128", 11)) {
 331                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 332                 if (par->cmap_adr)
 333                         par->cmap_type = cmap_r128;
 334         } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
 335                           || !strncmp(name, "ATY,RageM3p12A", 14))) {
 336                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 337                 if (par->cmap_adr)
 338                         par->cmap_type = cmap_M3A;
 339         } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
 340                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 341                 if (par->cmap_adr)
 342                         par->cmap_type = cmap_M3B;
 343         } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
 344                 par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
 345                 if (par->cmap_adr)
 346                         par->cmap_type = cmap_radeon;
 347         } else if (!strncmp(name, "ATY,", 4)) {
 348                 unsigned long base = address & 0xff000000UL;
 349                 par->cmap_adr =
 350                         ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
 351                 par->cmap_data = par->cmap_adr + 1;
 352                 par->cmap_type = cmap_m64;
 353         } else if (dp && (of_device_is_compatible(dp, "pci1014,b7") ||
 354                           of_device_is_compatible(dp, "pci1014,21c"))) {
 355                 par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
 356                 if (par->cmap_adr)
 357                         par->cmap_type = cmap_gxt2000;
 358         } else if (dp && !strncmp(name, "vga,Display-", 12)) {
 359                 /* Look for AVIVO initialized by SLOF */
 360                 struct device_node *pciparent = of_get_parent(dp);
 361                 const u32 *vid, *did;
 362                 vid = of_get_property(pciparent, "vendor-id", NULL);
 363                 did = of_get_property(pciparent, "device-id", NULL);
 364                 /* This will match most R5xx */
 365                 if (vid && did && *vid == 0x1002 &&
 366                     ((*did >= 0x7100 && *did < 0x7800) ||
 367                      (*did >= 0x9400))) {
 368                         par->cmap_adr = offb_map_reg(pciparent, 2, 0, 0x10000);
 369                         if (par->cmap_adr)
 370                                 par->cmap_type = cmap_avivo;
 371                 }
 372                 of_node_put(pciparent);
 373         }
 374         info->fix.visual = (par->cmap_type != cmap_unknown) ?
 375                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
 376 }
 377
 378 static void __init offb_init_fb(const char *name, const char *full_name,
 379                                 int width, int height, int depth,
 380                                 int pitch, unsigned long address,
 381                                 int foreign_endian, struct device_node *dp)
 382 {
 383         unsigned long res_size = pitch * height * (depth + 7) / 8;
 384         struct offb_par *par = &default_par;
 385         unsigned long res_start = address;
 386         struct fb_fix_screeninfo *fix;
 387         struct fb_var_screeninfo *var;
 388         struct fb_info *info;
 389
 390         if (!request_mem_region(res_start, res_size, "offb"))
 391                 return;
 392
 393         printk(KERN_INFO
 394                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 395                width, height, name, address, depth, pitch);
 396         if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
 397                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
 398                        depth);
 399                 release_mem_region(res_start, res_size);
 400                 return;
 401         }
 402
 403         info = framebuffer_alloc(sizeof(u32) * 16, NULL);
 404
 405         if (info == 0) {
 406                 release_mem_region(res_start, res_size);
 407                 return;
 408         }
 409
 410         fix = &info->fix;
 411         var = &info->var;
 412         info->par = par;
 413
 414         strcpy(fix->id, "OFfb ");
 415         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 416         fix->id[sizeof(fix->id) - 1] = '\0';
 417
 418         var->xres = var->xres_virtual = width;
 419         var->yres = var->yres_virtual = height;
 420         fix->line_length = pitch;
 421
 422         fix->smem_start = address;
 423         fix->smem_len = pitch * height;
 424         fix->type = FB_TYPE_PACKED_PIXELS;
 425         fix->type_aux = 0;
 426
 427         par->cmap_type = cmap_unknown;
 428         if (depth == 8)
 429                 offb_init_palette_hacks(info, dp, name, address);
 430         else
 431                 fix->visual = FB_VISUAL_TRUECOLOR;
 432
 433         var->xoffset = var->yoffset = 0;
 434         switch (depth) {
 435         case 8:
 436                 var->bits_per_pixel = 8;
 437                 var->red.offset = 0;
 438                 var->red.length = 8;
 439                 var->green.offset = 0;
 440                 var->green.length = 8;
 441                 var->blue.offset = 0;
 442                 var->blue.length = 8;
 443                 var->transp.offset = 0;
 444                 var->transp.length = 0;
 445                 break;
 446         case 15:                /* RGB 555 */
 447                 var->bits_per_pixel = 16;
 448                 var->red.offset = 10;
 449                 var->red.length = 5;
 450                 var->green.offset = 5;
 451                 var->green.length = 5;
 452                 var->blue.offset = 0;
 453                 var->blue.length = 5;
 454                 var->transp.offset = 0;
 455                 var->transp.length = 0;
 456                 break;
 457         case 16:                /* RGB 565 */
 458                 var->bits_per_pixel = 16;
 459                 var->red.offset = 11;
 460                 var->red.length = 5;
 461                 var->green.offset = 5;
 462                 var->green.length = 6;
 463                 var->blue.offset = 0;
 464                 var->blue.length = 5;
 465                 var->transp.offset = 0;
 466                 var->transp.length = 0;
 467                 break;
 468         case 32:                /* RGB 888 */
 469                 var->bits_per_pixel = 32;
 470                 var->red.offset = 16;
 471                 var->red.length = 8;
 472                 var->green.offset = 8;
 473                 var->green.length = 8;
 474                 var->blue.offset = 0;
 475                 var->blue.length = 8;
 476                 var->transp.offset = 24;
 477                 var->transp.length = 8;
 478                 break;
 479         }
 480         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 481             var->transp.msb_right = 0;
 482         var->grayscale = 0;
 483         var->nonstd = 0;
 484         var->activate = 0;
 485         var->height = var->width = -1;
 486         var->pixclock = 10000;
 487         var->left_margin = var->right_margin = 16;
 488         var->upper_margin = var->lower_margin = 16;
 489         var->hsync_len = var->vsync_len = 8;
 490         var->sync = 0;
 491         var->vmode = FB_VMODE_NONINTERLACED;
 492
 493         /* set offb aperture size for generic probing */
 494         info->apertures = alloc_apertures(1);
 495         if (!info->apertures)
 496                 goto out_aper;
 497         info->apertures->ranges[0].base = address;
 498         info->apertures->ranges[0].size = fix->smem_len;
 499
 500         info->fbops = &offb_ops;
 501         info->screen_base = ioremap(address, fix->smem_len);
 502         info->pseudo_palette = (void *) (info + 1);
 503         info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE | foreign_endian;
 504
 505         fb_alloc_cmap(&info->cmap, 256, 0);
 506
 507         if (register_framebuffer(info) < 0)
 508                 goto out_err;
 509
 510         printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
 511                info->node, full_name);
 512         return;
 513
 514 out_err:
 515         iounmap(info->screen_base);
 516 out_aper:
 517         iounmap(par->cmap_adr);
 518         par->cmap_adr = NULL;
 519         framebuffer_release(info);
 520         release_mem_region(res_start, res_size);
 521 }
 522
 523
 524 static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
 525 {
 526         unsigned int len;
 527         int i, width = 640, height = 480, depth = 8, pitch = 640;
 528         unsigned int flags, rsize, addr_prop = 0;
 529         unsigned long max_size = 0;
 530         u64 rstart, address = OF_BAD_ADDR;
 531         const u32 *pp, *addrp, *up;
 532         u64 asize;
 533         int foreign_endian = 0;
 534
 535 #ifdef __BIG_ENDIAN
 536         if (of_get_property(dp, "little-endian", NULL))
 537                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
 538 #else
 539         if (of_get_property(dp, "big-endian", NULL))
 540                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
 541 #endif
 542
 543         pp = of_get_property(dp, "linux,bootx-depth", &len);
 544         if (pp == NULL)
 545                 pp = of_get_property(dp, "depth", &len);
 546         if (pp && len == sizeof(u32))
 547                 depth = *pp;
 548
 549         pp = of_get_property(dp, "linux,bootx-width", &len);
 550         if (pp == NULL)
 551                 pp = of_get_property(dp, "width", &len);
 552         if (pp && len == sizeof(u32))
 553                 width = *pp;
 554
 555         pp = of_get_property(dp, "linux,bootx-height", &len);
 556         if (pp == NULL)
 557                 pp = of_get_property(dp, "height", &len);
 558         if (pp && len == sizeof(u32))
 559                 height = *pp;
 560
 561         pp = of_get_property(dp, "linux,bootx-linebytes", &len);
 562         if (pp == NULL)
 563                 pp = of_get_property(dp, "linebytes", &len);
 564         if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
 565                 pitch = *pp;
 566         else
 567                 pitch = width * ((depth + 7) / 8);
 568
 569         rsize = (unsigned long)pitch * (unsigned long)height;
 570
 571         /* Ok, now we try to figure out the address of the framebuffer.
 572          *
 573          * Unfortunately, Open Firmware doesn't provide a standard way to do
 574          * so. All we can do is a dodgy heuristic that happens to work in
 575          * practice. On most machines, the "address" property contains what
 576          * we need, though not on Matrox cards found in IBM machines. What I've
 577          * found that appears to give good results is to go through the PCI
 578          * ranges and pick one that is both big enough and if possible encloses
 579          * the "address" property. If none match, we pick the biggest
 580          */
 581         up = of_get_property(dp, "linux,bootx-addr", &len);
 582         if (up == NULL)
 583                 up = of_get_property(dp, "address", &len);
 584         if (up && len == sizeof(u32))
 585                 addr_prop = *up;
 586
 587         /* Hack for when BootX is passing us */
 588         if (no_real_node)
 589                 goto skip_addr;
 590
 591         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
 592                      != NULL; i++) {
 593                 int match_addrp = 0;
 594
 595                 if (!(flags & IORESOURCE_MEM))
 596                         continue;
 597                 if (asize < rsize)
 598                         continue;
 599                 rstart = of_translate_address(dp, addrp);
 600                 if (rstart == OF_BAD_ADDR)
 601                         continue;
 602                 if (addr_prop && (rstart <= addr_prop) &&
 603                     ((rstart + asize) >= (addr_prop + rsize)))
 604                         match_addrp = 1;
 605                 if (match_addrp) {
 606                         address = addr_prop;
 607                         break;
 608                 }
 609                 if (rsize > max_size) {
 610                         max_size = rsize;
 611                         address = OF_BAD_ADDR;
 612                 }
 613
 614                 if (address == OF_BAD_ADDR)
 615                         address = rstart;
 616         }
 617  skip_addr:
 618         if (address == OF_BAD_ADDR && addr_prop)
 619                 address = (u64)addr_prop;
 620         if (address != OF_BAD_ADDR) {
 621                 /* kludge for valkyrie */
 622                 if (strcmp(dp->name, "valkyrie") == 0)
 623                         address += 0x1000;
 624                 offb_init_fb(no_real_node ? "bootx" : dp->name,
 625                              no_real_node ? "display" : dp->full_name,
 626                              width, height, depth, pitch, address,
 627                              foreign_endian, no_real_node ? NULL : dp);
 628         }
 629 }
 630
 631 static int __init offb_init(void)
 632 {
 633         struct device_node *dp = NULL, *boot_disp = NULL;
 634
 635         if (fb_get_options("offb", NULL))
 636                 return -ENODEV;
 637
 638         /* Check if we have a MacOS display without a node spec */
 639         if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {
 640                 /* The old code tried to work out which node was the MacOS
 641                  * display based on the address. I'm dropping that since the
 642                  * lack of a node spec only happens with old BootX versions
 643                  * (users can update) and with this code, they'll still get
 644                  * a display (just not the palette hacks).
 645                  */
 646                 offb_init_nodriver(of_chosen, 1);
 647         }
 648
 649         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 650                 if (of_get_property(dp, "linux,opened", NULL) &&
 651                     of_get_property(dp, "linux,boot-display", NULL)) {
 652                         boot_disp = dp;
 653                         offb_init_nodriver(dp, 0);
 654                 }
 655         }
 656         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 657                 if (of_get_property(dp, "linux,opened", NULL) &&
 658                     dp != boot_disp)
 659                         offb_init_nodriver(dp, 0);
 660         }
 661
 662         return 0;
 663 }
 664
 665
 666 module_init(offb_init);
 667 MODULE_LICENSE("GPL");