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_simple,            /* 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         cmap_qemu,              /* qemu vga */
  52 };
  53
  54 struct offb_par {
  55         volatile void __iomem *cmap_adr;
  56         volatile void __iomem *cmap_data;
  57         int cmap_type;
  58         int blanked;
  59 };
  60
  61 struct offb_par default_par;
  62
  63 #ifdef CONFIG_PPC32
  64 extern boot_infos_t *boot_infos;
  65 #endif
  66
  67 /* Definitions used by the Avivo palette hack */
  68 #define AVIVO_DC_LUT_RW_SELECT                  0x6480
  69 #define AVIVO_DC_LUT_RW_MODE                    0x6484
  70 #define AVIVO_DC_LUT_RW_INDEX                   0x6488
  71 #define AVIVO_DC_LUT_SEQ_COLOR                  0x648c
  72 #define AVIVO_DC_LUT_PWL_DATA                   0x6490
  73 #define AVIVO_DC_LUT_30_COLOR                   0x6494
  74 #define AVIVO_DC_LUT_READ_PIPE_SELECT           0x6498
  75 #define AVIVO_DC_LUT_WRITE_EN_MASK              0x649c
  76 #define AVIVO_DC_LUT_AUTOFILL                   0x64a0
  77
  78 #define AVIVO_DC_LUTA_CONTROL                   0x64c0
  79 #define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE         0x64c4
  80 #define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN        0x64c8
  81 #define AVIVO_DC_LUTA_BLACK_OFFSET_RED          0x64cc
  82 #define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE         0x64d0
  83 #define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN        0x64d4
  84 #define AVIVO_DC_LUTA_WHITE_OFFSET_RED          0x64d8
  85
  86 #define AVIVO_DC_LUTB_CONTROL                   0x6cc0
  87 #define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE         0x6cc4
  88 #define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN        0x6cc8
  89 #define AVIVO_DC_LUTB_BLACK_OFFSET_RED          0x6ccc
  90 #define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE         0x6cd0
  91 #define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN        0x6cd4
  92 #define AVIVO_DC_LUTB_WHITE_OFFSET_RED          0x6cd8
  93
  94 #define FB_RIGHT_POS(p, bpp)         (fb_be_math(p) ? 0 : (32 - (bpp)))
  95
  96 static inline u32 offb_cmap_byteswap(struct fb_info *info, u32 value)
  97 {
  98         u32 bpp = info->var.bits_per_pixel;
  99
 100         return cpu_to_be32(value) >> FB_RIGHT_POS(info, bpp);
 101 }
 102
 103     /*
 104      *  Set a single color register. The values supplied are already
 105      *  rounded down to the hardware's capabilities (according to the
 106      *  entries in the var structure). Return != 0 for invalid regno.
 107      */
 108
 109 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 110                           u_int transp, struct fb_info *info)
 111 {
 112         struct offb_par *par = (struct offb_par *) info->par;
 113
 114         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 115                 u32 *pal = info->pseudo_palette;
 116                 u32 cr = red >> (16 - info->var.red.length);
 117                 u32 cg = green >> (16 - info->var.green.length);
 118                 u32 cb = blue >> (16 - info->var.blue.length);
 119                 u32 value;
 120
 121                 if (regno >= 16)
 122                         return -EINVAL;
 123
 124                 value = (cr << info->var.red.offset) |
 125                         (cg << info->var.green.offset) |
 126                         (cb << info->var.blue.offset);
 127                 if (info->var.transp.length > 0) {
 128                         u32 mask = (1 << info->var.transp.length) - 1;
 129                         mask <<= info->var.transp.offset;
 130                         value |= mask;
 131                 }
 132                 pal[regno] = offb_cmap_byteswap(info, value);
 133                 return 0;
 134         }
 135
 136         if (regno > 255)
 137                 return -EINVAL;
 138
 139         red >>= 8;
 140         green >>= 8;
 141         blue >>= 8;
 142
 143         if (!par->cmap_adr)
 144                 return 0;
 145
 146         switch (par->cmap_type) {
 147         case cmap_simple:
 148                 writeb(regno, par->cmap_adr);
 149                 writeb(red, par->cmap_data);
 150                 writeb(green, par->cmap_data);
 151                 writeb(blue, par->cmap_data);
 152                 break;
 153         case cmap_M3A:
 154                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 155                 out_le32(par->cmap_adr + 0x58,
 156                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 157         case cmap_r128:
 158                 /* Set palette index & data */
 159                 out_8(par->cmap_adr + 0xb0, regno);
 160                 out_le32(par->cmap_adr + 0xb4,
 161                          (red << 16 | green << 8 | blue));
 162                 break;
 163         case cmap_M3B:
 164                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 165                 out_le32(par->cmap_adr + 0x58,
 166                          in_le32(par->cmap_adr + 0x58) | 0x20);
 167                 /* Set palette index & data */
 168                 out_8(par->cmap_adr + 0xb0, regno);
 169                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 170                 break;
 171         case cmap_radeon:
 172                 /* Set palette index & data (could be smarter) */
 173                 out_8(par->cmap_adr + 0xb0, regno);
 174                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 175                 break;
 176         case cmap_gxt2000:
 177                 out_le32(((unsigned __iomem *) par->cmap_adr) + regno,
 178                          (red << 16 | green << 8 | blue));
 179                 break;
 180         case cmap_avivo:
 181                 /* Write to both LUTs for now */
 182                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 183                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 184                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
 185                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 186                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 187                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 188                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
 189                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 190                 break;
 191         }
 192
 193         return 0;
 194 }
 195
 196     /*
 197      *  Blank the display.
 198      */
 199
 200 static int offb_blank(int blank, struct fb_info *info)
 201 {
 202         struct offb_par *par = (struct offb_par *) info->par;
 203         int i, j;
 204
 205         if (!par->cmap_adr)
 206                 return 0;
 207
 208         if (!par->blanked)
 209                 if (!blank)
 210                         return 0;
 211
 212         par->blanked = blank;
 213
 214         if (blank)
 215                 for (i = 0; i < 256; i++) {
 216                         switch (par->cmap_type) {
 217                         case cmap_simple:
 218                                 writeb(i, par->cmap_adr);
 219                                 for (j = 0; j < 3; j++)
 220                                         writeb(0, par->cmap_data);
 221                                 break;
 222                         case cmap_M3A:
 223                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 224                                 out_le32(par->cmap_adr + 0x58,
 225                                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 226                         case cmap_r128:
 227                                 /* Set palette index & data */
 228                                 out_8(par->cmap_adr + 0xb0, i);
 229                                 out_le32(par->cmap_adr + 0xb4, 0);
 230                                 break;
 231                         case cmap_M3B:
 232                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 233                                 out_le32(par->cmap_adr + 0x58,
 234                                          in_le32(par->cmap_adr + 0x58) | 0x20);
 235                                 /* Set palette index & data */
 236                                 out_8(par->cmap_adr + 0xb0, i);
 237                                 out_le32(par->cmap_adr + 0xb4, 0);
 238                                 break;
 239                         case cmap_radeon:
 240                                 out_8(par->cmap_adr + 0xb0, i);
 241                                 out_le32(par->cmap_adr + 0xb4, 0);
 242                                 break;
 243                         case cmap_gxt2000:
 244                                 out_le32(((unsigned __iomem *) par->cmap_adr) + i,
 245                                          0);
 246                                 break;
 247                         case cmap_avivo:
 248                                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 249                                 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 250                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 251                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 252                                 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 253                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 254                                 break;
 255                         }
 256         } else
 257                 fb_set_cmap(&info->cmap, info);
 258         return 0;
 259 }
 260
 261 static int offb_set_par(struct fb_info *info)
 262 {
 263         struct offb_par *par = (struct offb_par *) info->par;
 264
 265         /* On avivo, initialize palette control */
 266         if (par->cmap_type == cmap_avivo) {
 267                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL);
 268                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE);
 269                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN);
 270                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED);
 271                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE);
 272                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN);
 273                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED);
 274                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL);
 275                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE);
 276                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN);
 277                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED);
 278                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE);
 279                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN);
 280                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED);
 281                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 282                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
 283                 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
 284                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 285                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
 286                 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
 287         }
 288         return 0;
 289 }
 290
 291 static void offb_destroy(struct fb_info *info)
 292 {
 293         if (info->screen_base)
 294                 iounmap(info->screen_base);
 295         release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
 296         framebuffer_release(info);
 297 }
 298
 299 static struct fb_ops offb_ops = {
 300         .owner          = THIS_MODULE,
 301         .fb_destroy     = offb_destroy,
 302         .fb_setcolreg   = offb_setcolreg,
 303         .fb_set_par     = offb_set_par,
 304         .fb_blank       = offb_blank,
 305         .fb_fillrect    = cfb_fillrect,
 306         .fb_copyarea    = cfb_copyarea,
 307         .fb_imageblit   = cfb_imageblit,
 308 };
 309
 310 static void __iomem *offb_map_reg(struct device_node *np, int index,
 311                                   unsigned long offset, unsigned long size)
 312 {
 313         const __be32 *addrp;
 314         u64 asize, taddr;
 315         unsigned int flags;
 316
 317         addrp = of_get_pci_address(np, index, &asize, &flags);
 318         if (addrp == NULL)
 319                 addrp = of_get_address(np, index, &asize, &flags);
 320         if (addrp == NULL)
 321                 return NULL;
 322         if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
 323                 return NULL;
 324         if ((offset + size) > asize)
 325                 return NULL;
 326         taddr = of_translate_address(np, addrp);
 327         if (taddr == OF_BAD_ADDR)
 328                 return NULL;
 329         return ioremap(taddr + offset, size);
 330 }
 331
 332 static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp,
 333                                     const char *name, unsigned long address)
 334 {
 335         struct offb_par *par = (struct offb_par *) info->par;
 336
 337         if (dp && !strncmp(name, "ATY,Rage128", 11)) {
 338                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 339                 if (par->cmap_adr)
 340                         par->cmap_type = cmap_r128;
 341         } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
 342                           || !strncmp(name, "ATY,RageM3p12A", 14))) {
 343                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 344                 if (par->cmap_adr)
 345                         par->cmap_type = cmap_M3A;
 346         } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
 347                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 348                 if (par->cmap_adr)
 349                         par->cmap_type = cmap_M3B;
 350         } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
 351                 par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
 352                 if (par->cmap_adr)
 353                         par->cmap_type = cmap_radeon;
 354         } else if (!strncmp(name, "ATY,", 4)) {
 355                 unsigned long base = address & 0xff000000UL;
 356                 par->cmap_adr =
 357                         ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
 358                 par->cmap_data = par->cmap_adr + 1;
 359                 par->cmap_type = cmap_simple;
 360         } else if (dp && (of_device_is_compatible(dp, "pci1014,b7") ||
 361                           of_device_is_compatible(dp, "pci1014,21c"))) {
 362                 par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
 363                 if (par->cmap_adr)
 364                         par->cmap_type = cmap_gxt2000;
 365         } else if (dp && !strncmp(name, "vga,Display-", 12)) {
 366                 /* Look for AVIVO initialized by SLOF */
 367                 struct device_node *pciparent = of_get_parent(dp);
 368                 const u32 *vid, *did;
 369                 vid = of_get_property(pciparent, "vendor-id", NULL);
 370                 did = of_get_property(pciparent, "device-id", NULL);
 371                 /* This will match most R5xx */
 372                 if (vid && did && *vid == 0x1002 &&
 373                     ((*did >= 0x7100 && *did < 0x7800) ||
 374                      (*did >= 0x9400))) {
 375                         par->cmap_adr = offb_map_reg(pciparent, 2, 0, 0x10000);
 376                         if (par->cmap_adr)
 377                                 par->cmap_type = cmap_avivo;
 378                 }
 379                 of_node_put(pciparent);
 380         } else if (dp && of_device_is_compatible(dp, "qemu,std-vga")) {
 381 #ifdef __BIG_ENDIAN
 382                 const __be32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 };
 383 #else
 384                 const __be32 io_of_addr[3] = { 0x00000001, 0x0, 0x0 };
 385 #endif
 386                 u64 io_addr = of_translate_address(dp, io_of_addr);
 387                 if (io_addr != OF_BAD_ADDR) {
 388                         par->cmap_adr = ioremap(io_addr + 0x3c8, 2);
 389                         if (par->cmap_adr) {
 390                                 par->cmap_type = cmap_simple;
 391                                 par->cmap_data = par->cmap_adr + 1;
 392                         }
 393                 }
 394         }
 395         info->fix.visual = (par->cmap_type != cmap_unknown) ?
 396                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
 397 }
 398
 399 static void __init offb_init_fb(const char *name, const char *full_name,
 400                                 int width, int height, int depth,
 401                                 int pitch, unsigned long address,
 402                                 int foreign_endian, struct device_node *dp)
 403 {
 404         unsigned long res_size = pitch * height;
 405         struct offb_par *par = &default_par;
 406         unsigned long res_start = address;
 407         struct fb_fix_screeninfo *fix;
 408         struct fb_var_screeninfo *var;
 409         struct fb_info *info;
 410
 411         if (!request_mem_region(res_start, res_size, "offb"))
 412                 return;
 413
 414         printk(KERN_INFO
 415                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 416                width, height, name, address, depth, pitch);
 417         if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
 418                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
 419                        depth);
 420                 release_mem_region(res_start, res_size);
 421                 return;
 422         }
 423
 424         info = framebuffer_alloc(sizeof(u32) * 16, NULL);
 425
 426         if (info == 0) {
 427                 release_mem_region(res_start, res_size);
 428                 return;
 429         }
 430
 431         fix = &info->fix;
 432         var = &info->var;
 433         info->par = par;
 434
 435         strcpy(fix->id, "OFfb ");
 436         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 437         fix->id[sizeof(fix->id) - 1] = '\0';
 438
 439         var->xres = var->xres_virtual = width;
 440         var->yres = var->yres_virtual = height;
 441         fix->line_length = pitch;
 442
 443         fix->smem_start = address;
 444         fix->smem_len = pitch * height;
 445         fix->type = FB_TYPE_PACKED_PIXELS;
 446         fix->type_aux = 0;
 447
 448         par->cmap_type = cmap_unknown;
 449         if (depth == 8)
 450                 offb_init_palette_hacks(info, dp, name, address);
 451         else
 452                 fix->visual = FB_VISUAL_TRUECOLOR;
 453
 454         var->xoffset = var->yoffset = 0;
 455         switch (depth) {
 456         case 8:
 457                 var->bits_per_pixel = 8;
 458                 var->red.offset = 0;
 459                 var->red.length = 8;
 460                 var->green.offset = 0;
 461                 var->green.length = 8;
 462                 var->blue.offset = 0;
 463                 var->blue.length = 8;
 464                 var->transp.offset = 0;
 465                 var->transp.length = 0;
 466                 break;
 467         case 15:                /* RGB 555 */
 468                 var->bits_per_pixel = 16;
 469                 var->red.offset = 10;
 470                 var->red.length = 5;
 471                 var->green.offset = 5;
 472                 var->green.length = 5;
 473                 var->blue.offset = 0;
 474                 var->blue.length = 5;
 475                 var->transp.offset = 0;
 476                 var->transp.length = 0;
 477                 break;
 478         case 16:                /* RGB 565 */
 479                 var->bits_per_pixel = 16;
 480                 var->red.offset = 11;
 481                 var->red.length = 5;
 482                 var->green.offset = 5;
 483                 var->green.length = 6;
 484                 var->blue.offset = 0;
 485                 var->blue.length = 5;
 486                 var->transp.offset = 0;
 487                 var->transp.length = 0;
 488                 break;
 489         case 32:                /* RGB 888 */
 490                 var->bits_per_pixel = 32;
 491                 var->red.offset = 16;
 492                 var->red.length = 8;
 493                 var->green.offset = 8;
 494                 var->green.length = 8;
 495                 var->blue.offset = 0;
 496                 var->blue.length = 8;
 497                 var->transp.offset = 24;
 498                 var->transp.length = 8;
 499                 break;
 500         }
 501         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 502             var->transp.msb_right = 0;
 503         var->grayscale = 0;
 504         var->nonstd = 0;
 505         var->activate = 0;
 506         var->height = var->width = -1;
 507         var->pixclock = 10000;
 508         var->left_margin = var->right_margin = 16;
 509         var->upper_margin = var->lower_margin = 16;
 510         var->hsync_len = var->vsync_len = 8;
 511         var->sync = 0;
 512         var->vmode = FB_VMODE_NONINTERLACED;
 513
 514         /* set offb aperture size for generic probing */
 515         info->apertures = alloc_apertures(1);
 516         if (!info->apertures)
 517                 goto out_aper;
 518         info->apertures->ranges[0].base = address;
 519         info->apertures->ranges[0].size = fix->smem_len;
 520
 521         info->fbops = &offb_ops;
 522         info->screen_base = ioremap(address, fix->smem_len);
 523         info->pseudo_palette = (void *) (info + 1);
 524         info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE | foreign_endian;
 525
 526         fb_alloc_cmap(&info->cmap, 256, 0);
 527
 528         if (register_framebuffer(info) < 0)
 529                 goto out_err;
 530
 531         fb_info(info, "Open Firmware frame buffer device on %s\n", full_name);
 532         return;
 533
 534 out_err:
 535         iounmap(info->screen_base);
 536 out_aper:
 537         iounmap(par->cmap_adr);
 538         par->cmap_adr = NULL;
 539         framebuffer_release(info);
 540         release_mem_region(res_start, res_size);
 541 }
 542
 543
 544 static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
 545 {
 546         unsigned int len;
 547         int i, width = 640, height = 480, depth = 8, pitch = 640;
 548         unsigned int flags, rsize, addr_prop = 0;
 549         unsigned long max_size = 0;
 550         u64 rstart, address = OF_BAD_ADDR;
 551         const __be32 *pp, *addrp, *up;
 552         u64 asize;
 553         int foreign_endian = 0;
 554
 555 #ifdef __BIG_ENDIAN
 556         if (of_get_property(dp, "little-endian", NULL))
 557                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
 558 #else
 559         if (of_get_property(dp, "big-endian", NULL))
 560                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
 561 #endif
 562
 563         pp = of_get_property(dp, "linux,bootx-depth", &len);
 564         if (pp == NULL)
 565                 pp = of_get_property(dp, "depth", &len);
 566         if (pp && len == sizeof(u32))
 567                 depth = be32_to_cpup(pp);
 568
 569         pp = of_get_property(dp, "linux,bootx-width", &len);
 570         if (pp == NULL)
 571                 pp = of_get_property(dp, "width", &len);
 572         if (pp && len == sizeof(u32))
 573                 width = be32_to_cpup(pp);
 574
 575         pp = of_get_property(dp, "linux,bootx-height", &len);
 576         if (pp == NULL)
 577                 pp = of_get_property(dp, "height", &len);
 578         if (pp && len == sizeof(u32))
 579                 height = be32_to_cpup(pp);
 580
 581         pp = of_get_property(dp, "linux,bootx-linebytes", &len);
 582         if (pp == NULL)
 583                 pp = of_get_property(dp, "linebytes", &len);
 584         if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
 585                 pitch = be32_to_cpup(pp);
 586         else
 587                 pitch = width * ((depth + 7) / 8);
 588
 589         rsize = (unsigned long)pitch * (unsigned long)height;
 590
 591         /* Ok, now we try to figure out the address of the framebuffer.
 592          *
 593          * Unfortunately, Open Firmware doesn't provide a standard way to do
 594          * so. All we can do is a dodgy heuristic that happens to work in
 595          * practice. On most machines, the "address" property contains what
 596          * we need, though not on Matrox cards found in IBM machines. What I've
 597          * found that appears to give good results is to go through the PCI
 598          * ranges and pick one that is both big enough and if possible encloses
 599          * the "address" property. If none match, we pick the biggest
 600          */
 601         up = of_get_property(dp, "linux,bootx-addr", &len);
 602         if (up == NULL)
 603                 up = of_get_property(dp, "address", &len);
 604         if (up && len == sizeof(u32))
 605                 addr_prop = *up;
 606
 607         /* Hack for when BootX is passing us */
 608         if (no_real_node)
 609                 goto skip_addr;
 610
 611         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
 612                      != NULL; i++) {
 613                 int match_addrp = 0;
 614
 615                 if (!(flags & IORESOURCE_MEM))
 616                         continue;
 617                 if (asize < rsize)
 618                         continue;
 619                 rstart = of_translate_address(dp, addrp);
 620                 if (rstart == OF_BAD_ADDR)
 621                         continue;
 622                 if (addr_prop && (rstart <= addr_prop) &&
 623                     ((rstart + asize) >= (addr_prop + rsize)))
 624                         match_addrp = 1;
 625                 if (match_addrp) {
 626                         address = addr_prop;
 627                         break;
 628                 }
 629                 if (rsize > max_size) {
 630                         max_size = rsize;
 631                         address = OF_BAD_ADDR;
 632                 }
 633
 634                 if (address == OF_BAD_ADDR)
 635                         address = rstart;
 636         }
 637  skip_addr:
 638         if (address == OF_BAD_ADDR && addr_prop)
 639                 address = (u64)addr_prop;
 640         if (address != OF_BAD_ADDR) {
 641                 /* kludge for valkyrie */
 642                 if (strcmp(dp->name, "valkyrie") == 0)
 643                         address += 0x1000;
 644                 offb_init_fb(no_real_node ? "bootx" : dp->name,
 645                              no_real_node ? "display" : dp->full_name,
 646                              width, height, depth, pitch, address,
 647                              foreign_endian, no_real_node ? NULL : dp);
 648         }
 649 }
 650
 651 static int __init offb_init(void)
 652 {
 653         struct device_node *dp = NULL, *boot_disp = NULL;
 654
 655         if (fb_get_options("offb", NULL))
 656                 return -ENODEV;
 657
 658         /* Check if we have a MacOS display without a node spec */
 659         if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {
 660                 /* The old code tried to work out which node was the MacOS
 661                  * display based on the address. I'm dropping that since the
 662                  * lack of a node spec only happens with old BootX versions
 663                  * (users can update) and with this code, they'll still get
 664                  * a display (just not the palette hacks).
 665                  */
 666                 offb_init_nodriver(of_chosen, 1);
 667         }
 668
 669         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 670                 if (of_get_property(dp, "linux,opened", NULL) &&
 671                     of_get_property(dp, "linux,boot-display", NULL)) {
 672                         boot_disp = dp;
 673                         offb_init_nodriver(dp, 0);
 674                 }
 675         }
 676         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 677                 if (of_get_property(dp, "linux,opened", NULL) &&
 678                     dp != boot_disp)
 679                         offb_init_nodriver(dp, 0);
 680         }
 681
 682         return 0;
 683 }
 684
 685
 686 module_init(offb_init);
 687 MODULE_LICENSE("GPL");