root/drivers/video/fbdev/offb.c

DEFINITIONS

1. offb_setcolreg
2. offb_blank
3. offb_set_par
4. offb_destroy
5. offb_map_reg
6. offb_init_palette_hacks
7. offb_init_fb
8. offb_init_nodriver
9. offb_init

   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_PPC32
  32 #include <asm/bootx.h>
  33 #endif
  34 
  35 #include "macmodes.h"
  36 
  37 /* Supported palette hacks */
  38 enum {
  39         cmap_unknown,
  40         cmap_simple,            /* ATI Mach64 */
  41         cmap_r128,              /* ATI Rage128 */
  42         cmap_M3A,               /* ATI Rage Mobility M3 Head A */
  43         cmap_M3B,               /* ATI Rage Mobility M3 Head B */
  44         cmap_radeon,            /* ATI Radeon */
  45         cmap_gxt2000,           /* IBM GXT2000 */
  46         cmap_avivo,             /* ATI R5xx */
  47         cmap_qemu,              /* qemu vga */
  48 };
  49 
  50 struct offb_par {
  51         volatile void __iomem *cmap_adr;
  52         volatile void __iomem *cmap_data;
  53         int cmap_type;
  54         int blanked;
  55 };
  56 
  57 struct offb_par default_par;
  58 
  59 #ifdef CONFIG_PPC32
  60 extern boot_infos_t *boot_infos;
  61 #endif
  62 
  63 /* Definitions used by the Avivo palette hack */
  64 #define AVIVO_DC_LUT_RW_SELECT                  0x6480
  65 #define AVIVO_DC_LUT_RW_MODE                    0x6484
  66 #define AVIVO_DC_LUT_RW_INDEX                   0x6488
  67 #define AVIVO_DC_LUT_SEQ_COLOR                  0x648c
  68 #define AVIVO_DC_LUT_PWL_DATA                   0x6490
  69 #define AVIVO_DC_LUT_30_COLOR                   0x6494
  70 #define AVIVO_DC_LUT_READ_PIPE_SELECT           0x6498
  71 #define AVIVO_DC_LUT_WRITE_EN_MASK              0x649c
  72 #define AVIVO_DC_LUT_AUTOFILL                   0x64a0
  73 
  74 #define AVIVO_DC_LUTA_CONTROL                   0x64c0
  75 #define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE         0x64c4
  76 #define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN        0x64c8
  77 #define AVIVO_DC_LUTA_BLACK_OFFSET_RED          0x64cc
  78 #define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE         0x64d0
  79 #define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN        0x64d4
  80 #define AVIVO_DC_LUTA_WHITE_OFFSET_RED          0x64d8
  81 
  82 #define AVIVO_DC_LUTB_CONTROL                   0x6cc0
  83 #define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE         0x6cc4
  84 #define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN        0x6cc8
  85 #define AVIVO_DC_LUTB_BLACK_OFFSET_RED          0x6ccc
  86 #define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE         0x6cd0
  87 #define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN        0x6cd4
  88 #define AVIVO_DC_LUTB_WHITE_OFFSET_RED          0x6cd8
  89 
  90     /*
  91      *  Set a single color register. The values supplied are already
  92      *  rounded down to the hardware's capabilities (according to the
  93      *  entries in the var structure). Return != 0 for invalid regno.
  94      */
  95 
  96 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  97                           u_int transp, struct fb_info *info)
  98 {
  99         struct offb_par *par = (struct offb_par *) info->par;
 100 
 101         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 102                 u32 *pal = info->pseudo_palette;
 103                 u32 cr = red >> (16 - info->var.red.length);
 104                 u32 cg = green >> (16 - info->var.green.length);
 105                 u32 cb = blue >> (16 - info->var.blue.length);
 106                 u32 value;
 107 
 108                 if (regno >= 16)
 109                         return -EINVAL;
 110 
 111                 value = (cr << info->var.red.offset) |
 112                         (cg << info->var.green.offset) |
 113                         (cb << info->var.blue.offset);
 114                 if (info->var.transp.length > 0) {
 115                         u32 mask = (1 << info->var.transp.length) - 1;
 116                         mask <<= info->var.transp.offset;
 117                         value |= mask;
 118                 }
 119                 pal[regno] = value;
 120                 return 0;
 121         }
 122 
 123         if (regno > 255)
 124                 return -EINVAL;
 125 
 126         red >>= 8;
 127         green >>= 8;
 128         blue >>= 8;
 129 
 130         if (!par->cmap_adr)
 131                 return 0;
 132 
 133         switch (par->cmap_type) {
 134         case cmap_simple:
 135                 writeb(regno, par->cmap_adr);
 136                 writeb(red, par->cmap_data);
 137                 writeb(green, par->cmap_data);
 138                 writeb(blue, par->cmap_data);
 139                 break;
 140         case cmap_M3A:
 141                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 142                 out_le32(par->cmap_adr + 0x58,
 143                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 144                 /* fall through */
 145         case cmap_r128:
 146                 /* Set palette index & data */
 147                 out_8(par->cmap_adr + 0xb0, regno);
 148                 out_le32(par->cmap_adr + 0xb4,
 149                          (red << 16 | green << 8 | blue));
 150                 break;
 151         case cmap_M3B:
 152                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 153                 out_le32(par->cmap_adr + 0x58,
 154                          in_le32(par->cmap_adr + 0x58) | 0x20);
 155                 /* Set palette index & data */
 156                 out_8(par->cmap_adr + 0xb0, regno);
 157                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 158                 break;
 159         case cmap_radeon:
 160                 /* Set palette index & data (could be smarter) */
 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_gxt2000:
 165                 out_le32(((unsigned __iomem *) par->cmap_adr) + regno,
 166                          (red << 16 | green << 8 | blue));
 167                 break;
 168         case cmap_avivo:
 169                 /* Write to both LUTs for now */
 170                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 171                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 172                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
 173                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 174                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 175                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 176                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
 177                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 178                 break;
 179         }
 180 
 181         return 0;
 182 }
 183 
 184     /*
 185      *  Blank the display.
 186      */
 187 
 188 static int offb_blank(int blank, struct fb_info *info)
 189 {
 190         struct offb_par *par = (struct offb_par *) info->par;
 191         int i, j;
 192 
 193         if (!par->cmap_adr)
 194                 return 0;
 195 
 196         if (!par->blanked)
 197                 if (!blank)
 198                         return 0;
 199 
 200         par->blanked = blank;
 201 
 202         if (blank)
 203                 for (i = 0; i < 256; i++) {
 204                         switch (par->cmap_type) {
 205                         case cmap_simple:
 206                                 writeb(i, par->cmap_adr);
 207                                 for (j = 0; j < 3; j++)
 208                                         writeb(0, par->cmap_data);
 209                                 break;
 210                         case cmap_M3A:
 211                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 212                                 out_le32(par->cmap_adr + 0x58,
 213                                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 214                                 /* fall through */
 215                         case cmap_r128:
 216                                 /* Set palette index & data */
 217                                 out_8(par->cmap_adr + 0xb0, i);
 218                                 out_le32(par->cmap_adr + 0xb4, 0);
 219                                 break;
 220                         case cmap_M3B:
 221                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 222                                 out_le32(par->cmap_adr + 0x58,
 223                                          in_le32(par->cmap_adr + 0x58) | 0x20);
 224                                 /* Set palette index & data */
 225                                 out_8(par->cmap_adr + 0xb0, i);
 226                                 out_le32(par->cmap_adr + 0xb4, 0);
 227                                 break;
 228                         case cmap_radeon:
 229                                 out_8(par->cmap_adr + 0xb0, i);
 230                                 out_le32(par->cmap_adr + 0xb4, 0);
 231                                 break;
 232                         case cmap_gxt2000:
 233                                 out_le32(((unsigned __iomem *) par->cmap_adr) + i,
 234                                          0);
 235                                 break;
 236                         case cmap_avivo:
 237                                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 238                                 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 239                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 240                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 241                                 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 242                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 243                                 break;
 244                         }
 245         } else
 246                 fb_set_cmap(&info->cmap, info);
 247         return 0;
 248 }
 249 
 250 static int offb_set_par(struct fb_info *info)
 251 {
 252         struct offb_par *par = (struct offb_par *) info->par;
 253 
 254         /* On avivo, initialize palette control */
 255         if (par->cmap_type == cmap_avivo) {
 256                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL);
 257                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE);
 258                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN);
 259                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED);
 260                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE);
 261                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN);
 262                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED);
 263                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL);
 264                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE);
 265                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN);
 266                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED);
 267                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE);
 268                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN);
 269                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED);
 270                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 271                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
 272                 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
 273                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 274                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
 275                 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
 276         }
 277         return 0;
 278 }
 279 
 280 static void offb_destroy(struct fb_info *info)
 281 {
 282         if (info->screen_base)
 283                 iounmap(info->screen_base);
 284         release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
 285         fb_dealloc_cmap(&info->cmap);
 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 __be32 *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                                     unsigned long address)
 324 {
 325         struct offb_par *par = (struct offb_par *) info->par;
 326 
 327         if (of_node_name_prefix(dp, "ATY,Rage128")) {
 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 (of_node_name_prefix(dp, "ATY,RageM3pA") ||
 332                    of_node_name_prefix(dp, "ATY,RageM3p12A")) {
 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 (of_node_name_prefix(dp, "ATY,RageM3pB")) {
 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 (of_node_name_prefix(dp, "ATY,Rage6")) {
 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 (of_node_name_prefix(dp, "ATY,")) {
 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_simple;
 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 (of_node_name_prefix(dp, "vga,Display-")) {
 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         } else if (dp && of_device_is_compatible(dp, "qemu,std-vga")) {
 371 #ifdef __BIG_ENDIAN
 372                 const __be32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 };
 373 #else
 374                 const __be32 io_of_addr[3] = { 0x00000001, 0x0, 0x0 };
 375 #endif
 376                 u64 io_addr = of_translate_address(dp, io_of_addr);
 377                 if (io_addr != OF_BAD_ADDR) {
 378                         par->cmap_adr = ioremap(io_addr + 0x3c8, 2);
 379                         if (par->cmap_adr) {
 380                                 par->cmap_type = cmap_simple;
 381                                 par->cmap_data = par->cmap_adr + 1;
 382                         }
 383                 }
 384         }
 385         info->fix.visual = (par->cmap_type != cmap_unknown) ?
 386                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
 387 }
 388 
 389 static void __init offb_init_fb(const char *name,
 390                                 int width, int height, int depth,
 391                                 int pitch, unsigned long address,
 392                                 int foreign_endian, struct device_node *dp)
 393 {
 394         unsigned long res_size = pitch * height;
 395         struct offb_par *par = &default_par;
 396         unsigned long res_start = address;
 397         struct fb_fix_screeninfo *fix;
 398         struct fb_var_screeninfo *var;
 399         struct fb_info *info;
 400 
 401         if (!request_mem_region(res_start, res_size, "offb"))
 402                 return;
 403 
 404         printk(KERN_INFO
 405                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 406                width, height, name, address, depth, pitch);
 407         if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
 408                 printk(KERN_ERR "%pOF: can't use depth = %d\n", dp, depth);
 409                 release_mem_region(res_start, res_size);
 410                 return;
 411         }
 412 
 413         info = framebuffer_alloc(sizeof(u32) * 16, NULL);
 414 
 415         if (info == 0) {
 416                 release_mem_region(res_start, res_size);
 417                 return;
 418         }
 419 
 420         fix = &info->fix;
 421         var = &info->var;
 422         info->par = par;
 423 
 424         if (name) {
 425                 strcpy(fix->id, "OFfb ");
 426                 strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 427                 fix->id[sizeof(fix->id) - 1] = '\0';
 428         } else
 429                 snprintf(fix->id, sizeof(fix->id), "OFfb %pOFn", dp);
 430 
 431 
 432         var->xres = var->xres_virtual = width;
 433         var->yres = var->yres_virtual = height;
 434         fix->line_length = pitch;
 435 
 436         fix->smem_start = address;
 437         fix->smem_len = pitch * height;
 438         fix->type = FB_TYPE_PACKED_PIXELS;
 439         fix->type_aux = 0;
 440 
 441         par->cmap_type = cmap_unknown;
 442         if (depth == 8)
 443                 offb_init_palette_hacks(info, dp, address);
 444         else
 445                 fix->visual = FB_VISUAL_TRUECOLOR;
 446 
 447         var->xoffset = var->yoffset = 0;
 448         switch (depth) {
 449         case 8:
 450                 var->bits_per_pixel = 8;
 451                 var->red.offset = 0;
 452                 var->red.length = 8;
 453                 var->green.offset = 0;
 454                 var->green.length = 8;
 455                 var->blue.offset = 0;
 456                 var->blue.length = 8;
 457                 var->transp.offset = 0;
 458                 var->transp.length = 0;
 459                 break;
 460         case 15:                /* RGB 555 */
 461                 var->bits_per_pixel = 16;
 462                 var->red.offset = 10;
 463                 var->red.length = 5;
 464                 var->green.offset = 5;
 465                 var->green.length = 5;
 466                 var->blue.offset = 0;
 467                 var->blue.length = 5;
 468                 var->transp.offset = 0;
 469                 var->transp.length = 0;
 470                 break;
 471         case 16:                /* RGB 565 */
 472                 var->bits_per_pixel = 16;
 473                 var->red.offset = 11;
 474                 var->red.length = 5;
 475                 var->green.offset = 5;
 476                 var->green.length = 6;
 477                 var->blue.offset = 0;
 478                 var->blue.length = 5;
 479                 var->transp.offset = 0;
 480                 var->transp.length = 0;
 481                 break;
 482         case 32:                /* RGB 888 */
 483                 var->bits_per_pixel = 32;
 484                 var->red.offset = 16;
 485                 var->red.length = 8;
 486                 var->green.offset = 8;
 487                 var->green.length = 8;
 488                 var->blue.offset = 0;
 489                 var->blue.length = 8;
 490                 var->transp.offset = 24;
 491                 var->transp.length = 8;
 492                 break;
 493         }
 494         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 495             var->transp.msb_right = 0;
 496         var->grayscale = 0;
 497         var->nonstd = 0;
 498         var->activate = 0;
 499         var->height = var->width = -1;
 500         var->pixclock = 10000;
 501         var->left_margin = var->right_margin = 16;
 502         var->upper_margin = var->lower_margin = 16;
 503         var->hsync_len = var->vsync_len = 8;
 504         var->sync = 0;
 505         var->vmode = FB_VMODE_NONINTERLACED;
 506 
 507         /* set offb aperture size for generic probing */
 508         info->apertures = alloc_apertures(1);
 509         if (!info->apertures)
 510                 goto out_aper;
 511         info->apertures->ranges[0].base = address;
 512         info->apertures->ranges[0].size = fix->smem_len;
 513 
 514         info->fbops = &offb_ops;
 515         info->screen_base = ioremap(address, fix->smem_len);
 516         info->pseudo_palette = (void *) (info + 1);
 517         info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE | foreign_endian;
 518 
 519         fb_alloc_cmap(&info->cmap, 256, 0);
 520 
 521         if (register_framebuffer(info) < 0)
 522                 goto out_err;
 523 
 524         fb_info(info, "Open Firmware frame buffer device on %pOF\n", dp);
 525         return;
 526 
 527 out_err:
 528         fb_dealloc_cmap(&info->cmap);
 529         iounmap(info->screen_base);
 530 out_aper:
 531         iounmap(par->cmap_adr);
 532         par->cmap_adr = NULL;
 533         framebuffer_release(info);
 534         release_mem_region(res_start, res_size);
 535 }
 536 
 537 
 538 static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
 539 {
 540         unsigned int len;
 541         int i, width = 640, height = 480, depth = 8, pitch = 640;
 542         unsigned int flags, rsize, addr_prop = 0;
 543         unsigned long max_size = 0;
 544         u64 rstart, address = OF_BAD_ADDR;
 545         const __be32 *pp, *addrp, *up;
 546         u64 asize;
 547         int foreign_endian = 0;
 548 
 549 #ifdef __BIG_ENDIAN
 550         if (of_get_property(dp, "little-endian", NULL))
 551                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
 552 #else
 553         if (of_get_property(dp, "big-endian", NULL))
 554                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
 555 #endif
 556 
 557         pp = of_get_property(dp, "linux,bootx-depth", &len);
 558         if (pp == NULL)
 559                 pp = of_get_property(dp, "depth", &len);
 560         if (pp && len == sizeof(u32))
 561                 depth = be32_to_cpup(pp);
 562 
 563         pp = of_get_property(dp, "linux,bootx-width", &len);
 564         if (pp == NULL)
 565                 pp = of_get_property(dp, "width", &len);
 566         if (pp && len == sizeof(u32))
 567                 width = be32_to_cpup(pp);
 568 
 569         pp = of_get_property(dp, "linux,bootx-height", &len);
 570         if (pp == NULL)
 571                 pp = of_get_property(dp, "height", &len);
 572         if (pp && len == sizeof(u32))
 573                 height = be32_to_cpup(pp);
 574 
 575         pp = of_get_property(dp, "linux,bootx-linebytes", &len);
 576         if (pp == NULL)
 577                 pp = of_get_property(dp, "linebytes", &len);
 578         if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
 579                 pitch = be32_to_cpup(pp);
 580         else
 581                 pitch = width * ((depth + 7) / 8);
 582 
 583         rsize = (unsigned long)pitch * (unsigned long)height;
 584 
 585         /* Ok, now we try to figure out the address of the framebuffer.
 586          *
 587          * Unfortunately, Open Firmware doesn't provide a standard way to do
 588          * so. All we can do is a dodgy heuristic that happens to work in
 589          * practice. On most machines, the "address" property contains what
 590          * we need, though not on Matrox cards found in IBM machines. What I've
 591          * found that appears to give good results is to go through the PCI
 592          * ranges and pick one that is both big enough and if possible encloses
 593          * the "address" property. If none match, we pick the biggest
 594          */
 595         up = of_get_property(dp, "linux,bootx-addr", &len);
 596         if (up == NULL)
 597                 up = of_get_property(dp, "address", &len);
 598         if (up && len == sizeof(u32))
 599                 addr_prop = *up;
 600 
 601         /* Hack for when BootX is passing us */
 602         if (no_real_node)
 603                 goto skip_addr;
 604 
 605         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
 606                      != NULL; i++) {
 607                 int match_addrp = 0;
 608 
 609                 if (!(flags & IORESOURCE_MEM))
 610                         continue;
 611                 if (asize < rsize)
 612                         continue;
 613                 rstart = of_translate_address(dp, addrp);
 614                 if (rstart == OF_BAD_ADDR)
 615                         continue;
 616                 if (addr_prop && (rstart <= addr_prop) &&
 617                     ((rstart + asize) >= (addr_prop + rsize)))
 618                         match_addrp = 1;
 619                 if (match_addrp) {
 620                         address = addr_prop;
 621                         break;
 622                 }
 623                 if (rsize > max_size) {
 624                         max_size = rsize;
 625                         address = OF_BAD_ADDR;
 626                 }
 627 
 628                 if (address == OF_BAD_ADDR)
 629                         address = rstart;
 630         }
 631  skip_addr:
 632         if (address == OF_BAD_ADDR && addr_prop)
 633                 address = (u64)addr_prop;
 634         if (address != OF_BAD_ADDR) {
 635 #ifdef CONFIG_PCI
 636                 const __be32 *vidp, *didp;
 637                 u32 vid, did;
 638                 struct pci_dev *pdev;
 639 
 640                 vidp = of_get_property(dp, "vendor-id", NULL);
 641                 didp = of_get_property(dp, "device-id", NULL);
 642                 if (vidp && didp) {
 643                         vid = be32_to_cpup(vidp);
 644                         did = be32_to_cpup(didp);
 645                         pdev = pci_get_device(vid, did, NULL);
 646                         if (!pdev || pci_enable_device(pdev))
 647                                 return;
 648                 }
 649 #endif
 650                 /* kludge for valkyrie */
 651                 if (of_node_name_eq(dp, "valkyrie"))
 652                         address += 0x1000;
 653                 offb_init_fb(no_real_node ? "bootx" : NULL,
 654                              width, height, depth, pitch, address,
 655                              foreign_endian, no_real_node ? NULL : dp);
 656         }
 657 }
 658 
 659 static int __init offb_init(void)
 660 {
 661         struct device_node *dp = NULL, *boot_disp = NULL;
 662 
 663         if (fb_get_options("offb", NULL))
 664                 return -ENODEV;
 665 
 666         /* Check if we have a MacOS display without a node spec */
 667         if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {
 668                 /* The old code tried to work out which node was the MacOS
 669                  * display based on the address. I'm dropping that since the
 670                  * lack of a node spec only happens with old BootX versions
 671                  * (users can update) and with this code, they'll still get
 672                  * a display (just not the palette hacks).
 673                  */
 674                 offb_init_nodriver(of_chosen, 1);
 675         }
 676 
 677         for_each_node_by_type(dp, "display") {
 678                 if (of_get_property(dp, "linux,opened", NULL) &&
 679                     of_get_property(dp, "linux,boot-display", NULL)) {
 680                         boot_disp = dp;
 681                         offb_init_nodriver(dp, 0);
 682                 }
 683         }
 684         for_each_node_by_type(dp, "display") {
 685                 if (of_get_property(dp, "linux,opened", NULL) &&
 686                     dp != boot_disp)
 687                         offb_init_nodriver(dp, 0);
 688         }
 689 
 690         return 0;
 691 }
 692 
 693 
 694 module_init(offb_init);
 695 MODULE_LICENSE("GPL");