drivers/video/fbdev/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/aperture.h>
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/errno.h>
  19 #include <linux/string.h>
  20 #include <linux/mm.h>
  21 #include <linux/vmalloc.h>
  22 #include <linux/delay.h>
  23 #include <linux/of.h>
  24 #include <linux/of_address.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/fb.h>
  27 #include <linux/init.h>
  28 #include <linux/ioport.h>
  29 #include <linux/pci.h>
  30 #include <linux/platform_device.h>
  31 #include <asm/io.h>
  32
  33 #ifdef CONFIG_PPC32
  34 #include <asm/bootx.h>
  35 #endif
  36
  37 #include "macmodes.h"
  38
  39 /* Supported palette hacks */
  40 enum {
  41         cmap_unknown,
  42         cmap_simple,            /* ATI Mach64 */
  43         cmap_r128,              /* ATI Rage128 */
  44         cmap_M3A,               /* ATI Rage Mobility M3 Head A */
  45         cmap_M3B,               /* ATI Rage Mobility M3 Head B */
  46         cmap_radeon,            /* ATI Radeon */
  47         cmap_gxt2000,           /* IBM GXT2000 */
  48         cmap_avivo,             /* ATI R5xx */
  49         cmap_qemu,              /* qemu vga */
  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         u32 pseudo_palette[16];
  58         resource_size_t base;
  59         resource_size_t size;
  60 };
  61
  62 #ifdef CONFIG_PPC32
  63 extern boot_infos_t *boot_infos;
  64 #endif
  65
  66 /* Definitions used by the Avivo palette hack */
  67 #define AVIVO_DC_LUT_RW_SELECT                  0x6480
  68 #define AVIVO_DC_LUT_RW_MODE                    0x6484
  69 #define AVIVO_DC_LUT_RW_INDEX                   0x6488
  70 #define AVIVO_DC_LUT_SEQ_COLOR                  0x648c
  71 #define AVIVO_DC_LUT_PWL_DATA                   0x6490
  72 #define AVIVO_DC_LUT_30_COLOR                   0x6494
  73 #define AVIVO_DC_LUT_READ_PIPE_SELECT           0x6498
  74 #define AVIVO_DC_LUT_WRITE_EN_MASK              0x649c
  75 #define AVIVO_DC_LUT_AUTOFILL                   0x64a0
  76
  77 #define AVIVO_DC_LUTA_CONTROL                   0x64c0
  78 #define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE         0x64c4
  79 #define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN        0x64c8
  80 #define AVIVO_DC_LUTA_BLACK_OFFSET_RED          0x64cc
  81 #define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE         0x64d0
  82 #define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN        0x64d4
  83 #define AVIVO_DC_LUTA_WHITE_OFFSET_RED          0x64d8
  84
  85 #define AVIVO_DC_LUTB_CONTROL                   0x6cc0
  86 #define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE         0x6cc4
  87 #define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN        0x6cc8
  88 #define AVIVO_DC_LUTB_BLACK_OFFSET_RED          0x6ccc
  89 #define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE         0x6cd0
  90 #define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN        0x6cd4
  91 #define AVIVO_DC_LUTB_WHITE_OFFSET_RED          0x6cd8
  92
  93     /*
  94      *  Set a single color register. The values supplied are already
  95      *  rounded down to the hardware's capabilities (according to the
  96      *  entries in the var structure). Return != 0 for invalid regno.
  97      */
  98
  99 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 100                           u_int transp, struct fb_info *info)
 101 {
 102         struct offb_par *par = (struct offb_par *) info->par;
 103
 104         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 105                 u32 *pal = info->pseudo_palette;
 106                 u32 cr = red >> (16 - info->var.red.length);
 107                 u32 cg = green >> (16 - info->var.green.length);
 108                 u32 cb = blue >> (16 - info->var.blue.length);
 109                 u32 value;
 110
 111                 if (regno >= 16)
 112                         return -EINVAL;
 113
 114                 value = (cr << info->var.red.offset) |
 115                         (cg << info->var.green.offset) |
 116                         (cb << info->var.blue.offset);
 117                 if (info->var.transp.length > 0) {
 118                         u32 mask = (1 << info->var.transp.length) - 1;
 119                         mask <<= info->var.transp.offset;
 120                         value |= mask;
 121                 }
 122                 pal[regno] = value;
 123                 return 0;
 124         }
 125
 126         if (regno > 255)
 127                 return -EINVAL;
 128
 129         red >>= 8;
 130         green >>= 8;
 131         blue >>= 8;
 132
 133         if (!par->cmap_adr)
 134                 return 0;
 135
 136         switch (par->cmap_type) {
 137         case cmap_simple:
 138                 writeb(regno, par->cmap_adr);
 139                 writeb(red, par->cmap_data);
 140                 writeb(green, par->cmap_data);
 141                 writeb(blue, par->cmap_data);
 142                 break;
 143         case cmap_M3A:
 144                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 145                 out_le32(par->cmap_adr + 0x58,
 146                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 147                 fallthrough;
 148         case cmap_r128:
 149                 /* Set palette index & data */
 150                 out_8(par->cmap_adr + 0xb0, regno);
 151                 out_le32(par->cmap_adr + 0xb4,
 152                          (red << 16 | green << 8 | blue));
 153                 break;
 154         case cmap_M3B:
 155                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 156                 out_le32(par->cmap_adr + 0x58,
 157                          in_le32(par->cmap_adr + 0x58) | 0x20);
 158                 /* Set palette index & data */
 159                 out_8(par->cmap_adr + 0xb0, regno);
 160                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 161                 break;
 162         case cmap_radeon:
 163                 /* Set palette index & data (could be smarter) */
 164                 out_8(par->cmap_adr + 0xb0, regno);
 165                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 166                 break;
 167         case cmap_gxt2000:
 168                 out_le32(((unsigned __iomem *) par->cmap_adr) + regno,
 169                          (red << 16 | green << 8 | blue));
 170                 break;
 171         case cmap_avivo:
 172                 /* Write to both LUTs for now */
 173                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 174                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 175                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
 176                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 177                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 178                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 179                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
 180                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 181                 break;
 182         }
 183
 184         return 0;
 185 }
 186
 187     /*
 188      *  Blank the display.
 189      */
 190
 191 static int offb_blank(int blank, struct fb_info *info)
 192 {
 193         struct offb_par *par = (struct offb_par *) info->par;
 194         int i, j;
 195
 196         if (!par->cmap_adr)
 197                 return 0;
 198
 199         if (!par->blanked)
 200                 if (!blank)
 201                         return 0;
 202
 203         par->blanked = blank;
 204
 205         if (blank)
 206                 for (i = 0; i < 256; i++) {
 207                         switch (par->cmap_type) {
 208                         case cmap_simple:
 209                                 writeb(i, par->cmap_adr);
 210                                 for (j = 0; j < 3; j++)
 211                                         writeb(0, par->cmap_data);
 212                                 break;
 213                         case cmap_M3A:
 214                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 215                                 out_le32(par->cmap_adr + 0x58,
 216                                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 217                                 fallthrough;
 218                         case cmap_r128:
 219                                 /* Set palette index & data */
 220                                 out_8(par->cmap_adr + 0xb0, i);
 221                                 out_le32(par->cmap_adr + 0xb4, 0);
 222                                 break;
 223                         case cmap_M3B:
 224                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 225                                 out_le32(par->cmap_adr + 0x58,
 226                                          in_le32(par->cmap_adr + 0x58) | 0x20);
 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_radeon:
 232                                 out_8(par->cmap_adr + 0xb0, i);
 233                                 out_le32(par->cmap_adr + 0xb4, 0);
 234                                 break;
 235                         case cmap_gxt2000:
 236                                 out_le32(((unsigned __iomem *) par->cmap_adr) + i,
 237                                          0);
 238                                 break;
 239                         case cmap_avivo:
 240                                 writel(1, 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                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 244                                 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 245                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 246                                 break;
 247                         }
 248         } else
 249                 fb_set_cmap(&info->cmap, info);
 250         return 0;
 251 }
 252
 253 static int offb_set_par(struct fb_info *info)
 254 {
 255         struct offb_par *par = (struct offb_par *) info->par;
 256
 257         /* On avivo, initialize palette control */
 258         if (par->cmap_type == cmap_avivo) {
 259                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL);
 260                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE);
 261                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN);
 262                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED);
 263                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE);
 264                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN);
 265                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED);
 266                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL);
 267                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE);
 268                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN);
 269                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED);
 270                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE);
 271                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN);
 272                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED);
 273                 writel(1, 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                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 277                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
 278                 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
 279         }
 280         return 0;
 281 }
 282
 283 static void offb_destroy(struct fb_info *info)
 284 {
 285         struct offb_par *par = info->par;
 286
 287         if (info->screen_base)
 288                 iounmap(info->screen_base);
 289         release_mem_region(par->base, par->size);
 290         fb_dealloc_cmap(&info->cmap);
 291         framebuffer_release(info);
 292 }
 293
 294 static const struct fb_ops offb_ops = {
 295         .owner          = THIS_MODULE,
 296         FB_DEFAULT_IOMEM_OPS,
 297         .fb_destroy     = offb_destroy,
 298         .fb_setcolreg   = offb_setcolreg,
 299         .fb_set_par     = offb_set_par,
 300         .fb_blank       = offb_blank,
 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 __be32 *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                                     unsigned long address)
 327 {
 328         struct offb_par *par = (struct offb_par *) info->par;
 329
 330         if (of_node_name_prefix(dp, "ATY,Rage128")) {
 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 (of_node_name_prefix(dp, "ATY,RageM3pA") ||
 335                    of_node_name_prefix(dp, "ATY,RageM3p12A")) {
 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 (of_node_name_prefix(dp, "ATY,RageM3pB")) {
 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 (of_node_name_prefix(dp, "ATY,Rage6")) {
 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 (of_node_name_prefix(dp, "ATY,")) {
 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_simple;
 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 (of_node_name_prefix(dp, "vga,Display-")) {
 359                 /* Look for AVIVO initialized by SLOF */
 360                 struct device_node *pciparent __free(device_node) = 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         } else if (dp && of_device_is_compatible(dp, "qemu,std-vga")) {
 373 #ifdef __BIG_ENDIAN
 374                 const __be32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 };
 375 #else
 376                 const __be32 io_of_addr[3] = { 0x00000001, 0x0, 0x0 };
 377 #endif
 378                 u64 io_addr = of_translate_address(dp, io_of_addr);
 379                 if (io_addr != OF_BAD_ADDR) {
 380                         par->cmap_adr = ioremap(io_addr + 0x3c8, 2);
 381                         if (par->cmap_adr) {
 382                                 par->cmap_type = cmap_simple;
 383                                 par->cmap_data = par->cmap_adr + 1;
 384                         }
 385                 }
 386         }
 387         info->fix.visual = (par->cmap_type != cmap_unknown) ?
 388                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
 389 }
 390
 391 static void offb_init_fb(struct platform_device *parent, const char *name,
 392                          int width, int height, int depth,
 393                          int pitch, unsigned long address,
 394                          int foreign_endian, struct device_node *dp)
 395 {
 396         unsigned long res_size = pitch * height;
 397         unsigned long res_start = address;
 398         struct fb_fix_screeninfo *fix;
 399         struct fb_var_screeninfo *var;
 400         struct fb_info *info;
 401         struct offb_par *par;
 402
 403         if (!request_mem_region(res_start, res_size, "offb"))
 404                 return;
 405
 406         printk(KERN_INFO
 407                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 408                width, height, name, address, depth, pitch);
 409         if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
 410                 printk(KERN_ERR "%pOF: can't use depth = %d\n", dp, depth);
 411                 release_mem_region(res_start, res_size);
 412                 return;
 413         }
 414
 415         info = framebuffer_alloc(sizeof(*par), &parent->dev);
 416         if (!info) {
 417                 release_mem_region(res_start, res_size);
 418                 return;
 419         }
 420         platform_set_drvdata(parent, info);
 421         par = info->par;
 422         fix = &info->fix;
 423         var = &info->var;
 424
 425         if (name)
 426                 snprintf(fix->id, sizeof(fix->id), "OFfb %s", name);
 427         else
 428                 snprintf(fix->id, sizeof(fix->id), "OFfb %pOFn", dp);
 429
 430
 431         var->xres = var->xres_virtual = width;
 432         var->yres = var->yres_virtual = height;
 433         fix->line_length = pitch;
 434
 435         fix->smem_start = address;
 436         fix->smem_len = pitch * height;
 437         fix->type = FB_TYPE_PACKED_PIXELS;
 438         fix->type_aux = 0;
 439
 440         par->cmap_type = cmap_unknown;
 441         if (depth == 8)
 442                 offb_init_palette_hacks(info, dp, address);
 443         else
 444                 fix->visual = FB_VISUAL_TRUECOLOR;
 445
 446         var->xoffset = var->yoffset = 0;
 447         switch (depth) {
 448         case 8:
 449                 var->bits_per_pixel = 8;
 450                 var->red.offset = 0;
 451                 var->red.length = 8;
 452                 var->green.offset = 0;
 453                 var->green.length = 8;
 454                 var->blue.offset = 0;
 455                 var->blue.length = 8;
 456                 var->transp.offset = 0;
 457                 var->transp.length = 0;
 458                 break;
 459         case 15:                /* RGB 555 */
 460                 var->bits_per_pixel = 16;
 461                 var->red.offset = 10;
 462                 var->red.length = 5;
 463                 var->green.offset = 5;
 464                 var->green.length = 5;
 465                 var->blue.offset = 0;
 466                 var->blue.length = 5;
 467                 var->transp.offset = 0;
 468                 var->transp.length = 0;
 469                 break;
 470         case 16:                /* RGB 565 */
 471                 var->bits_per_pixel = 16;
 472                 var->red.offset = 11;
 473                 var->red.length = 5;
 474                 var->green.offset = 5;
 475                 var->green.length = 6;
 476                 var->blue.offset = 0;
 477                 var->blue.length = 5;
 478                 var->transp.offset = 0;
 479                 var->transp.length = 0;
 480                 break;
 481         case 32:                /* RGB 888 */
 482                 var->bits_per_pixel = 32;
 483                 var->red.offset = 16;
 484                 var->red.length = 8;
 485                 var->green.offset = 8;
 486                 var->green.length = 8;
 487                 var->blue.offset = 0;
 488                 var->blue.length = 8;
 489                 var->transp.offset = 24;
 490                 var->transp.length = 8;
 491                 break;
 492         }
 493         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 494             var->transp.msb_right = 0;
 495         var->grayscale = 0;
 496         var->nonstd = 0;
 497         var->activate = 0;
 498         var->height = var->width = -1;
 499         var->pixclock = 10000;
 500         var->left_margin = var->right_margin = 16;
 501         var->upper_margin = var->lower_margin = 16;
 502         var->hsync_len = var->vsync_len = 8;
 503         var->sync = 0;
 504         var->vmode = FB_VMODE_NONINTERLACED;
 505
 506         par->base = address;
 507         par->size = fix->smem_len;
 508
 509         info->fbops = &offb_ops;
 510         info->screen_base = ioremap(address, fix->smem_len);
 511         info->pseudo_palette = par->pseudo_palette;
 512         info->flags = foreign_endian;
 513
 514         fb_alloc_cmap(&info->cmap, 256, 0);
 515
 516         if (devm_aperture_acquire_for_platform_device(parent, par->base, par->size) < 0)
 517                 goto out_err;
 518         if (register_framebuffer(info) < 0)
 519                 goto out_err;
 520
 521         fb_info(info, "Open Firmware frame buffer device on %pOF\n", dp);
 522         return;
 523
 524 out_err:
 525         fb_dealloc_cmap(&info->cmap);
 526         iounmap(info->screen_base);
 527         iounmap(par->cmap_adr);
 528         par->cmap_adr = NULL;
 529         framebuffer_release(info);
 530         release_mem_region(res_start, res_size);
 531 }
 532
 533
 534 static void offb_init_nodriver(struct platform_device *parent, struct device_node *dp,
 535                                int no_real_node)
 536 {
 537         unsigned int len;
 538         int i, width = 640, height = 480, depth = 8, pitch = 640;
 539         unsigned int flags, rsize, addr_prop = 0;
 540         unsigned long max_size = 0;
 541         u64 rstart, address = OF_BAD_ADDR;
 542         const __be32 *pp, *addrp, *up;
 543         u64 asize;
 544         int foreign_endian = 0;
 545
 546 #ifdef __BIG_ENDIAN
 547         if (of_property_read_bool(dp, "little-endian"))
 548                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
 549 #else
 550         if (of_property_read_bool(dp, "big-endian"))
 551                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
 552 #endif
 553
 554         pp = of_get_property(dp, "linux,bootx-depth", &len);
 555         if (pp == NULL)
 556                 pp = of_get_property(dp, "depth", &len);
 557         if (pp && len == sizeof(u32))
 558                 depth = be32_to_cpup(pp);
 559
 560         pp = of_get_property(dp, "linux,bootx-width", &len);
 561         if (pp == NULL)
 562                 pp = of_get_property(dp, "width", &len);
 563         if (pp && len == sizeof(u32))
 564                 width = be32_to_cpup(pp);
 565
 566         pp = of_get_property(dp, "linux,bootx-height", &len);
 567         if (pp == NULL)
 568                 pp = of_get_property(dp, "height", &len);
 569         if (pp && len == sizeof(u32))
 570                 height = be32_to_cpup(pp);
 571
 572         pp = of_get_property(dp, "linux,bootx-linebytes", &len);
 573         if (pp == NULL)
 574                 pp = of_get_property(dp, "linebytes", &len);
 575         if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
 576                 pitch = be32_to_cpup(pp);
 577         else
 578                 pitch = width * ((depth + 7) / 8);
 579
 580         rsize = (unsigned long)pitch * (unsigned long)height;
 581
 582         /* Ok, now we try to figure out the address of the framebuffer.
 583          *
 584          * Unfortunately, Open Firmware doesn't provide a standard way to do
 585          * so. All we can do is a dodgy heuristic that happens to work in
 586          * practice. On most machines, the "address" property contains what
 587          * we need, though not on Matrox cards found in IBM machines. What I've
 588          * found that appears to give good results is to go through the PCI
 589          * ranges and pick one that is both big enough and if possible encloses
 590          * the "address" property. If none match, we pick the biggest
 591          */
 592         up = of_get_property(dp, "linux,bootx-addr", &len);
 593         if (up == NULL)
 594                 up = of_get_property(dp, "address", &len);
 595         if (up && len == sizeof(u32))
 596                 addr_prop = *up;
 597
 598         /* Hack for when BootX is passing us */
 599         if (no_real_node)
 600                 goto skip_addr;
 601
 602         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
 603                      != NULL; i++) {
 604                 int match_addrp = 0;
 605
 606                 if (!(flags & IORESOURCE_MEM))
 607                         continue;
 608                 if (asize < rsize)
 609                         continue;
 610                 rstart = of_translate_address(dp, addrp);
 611                 if (rstart == OF_BAD_ADDR)
 612                         continue;
 613                 if (addr_prop && (rstart <= addr_prop) &&
 614                     ((rstart + asize) >= (addr_prop + rsize)))
 615                         match_addrp = 1;
 616                 if (match_addrp) {
 617                         address = addr_prop;
 618                         break;
 619                 }
 620                 if (rsize > max_size) {
 621                         max_size = rsize;
 622                         address = OF_BAD_ADDR;
 623                 }
 624
 625                 if (address == OF_BAD_ADDR)
 626                         address = rstart;
 627         }
 628  skip_addr:
 629         if (address == OF_BAD_ADDR && addr_prop)
 630                 address = (u64)addr_prop;
 631         if (address != OF_BAD_ADDR) {
 632 #ifdef CONFIG_PCI
 633                 const __be32 *vidp, *didp;
 634                 u32 vid, did;
 635                 struct pci_dev *pdev;
 636
 637                 vidp = of_get_property(dp, "vendor-id", NULL);
 638                 didp = of_get_property(dp, "device-id", NULL);
 639                 if (vidp && didp) {
 640                         vid = be32_to_cpup(vidp);
 641                         did = be32_to_cpup(didp);
 642                         pdev = pci_get_device(vid, did, NULL);
 643                         if (!pdev || pci_enable_device(pdev))
 644                                 return;
 645                 }
 646 #endif
 647                 /* kludge for valkyrie */
 648                 if (of_node_name_eq(dp, "valkyrie"))
 649                         address += 0x1000;
 650                 offb_init_fb(parent, no_real_node ? "bootx" : NULL,
 651                              width, height, depth, pitch, address,
 652                              foreign_endian, no_real_node ? NULL : dp);
 653         }
 654 }
 655
 656 static void offb_remove(struct platform_device *pdev)
 657 {
 658         struct fb_info *info = platform_get_drvdata(pdev);
 659
 660         if (info)
 661                 unregister_framebuffer(info);
 662 }
 663
 664 static int offb_probe_bootx_noscreen(struct platform_device *pdev)
 665 {
 666         offb_init_nodriver(pdev, of_chosen, 1);
 667
 668         return 0;
 669 }
 670
 671 static struct platform_driver offb_driver_bootx_noscreen = {
 672         .driver = {
 673                 .name = "bootx-noscreen",
 674         },
 675         .probe = offb_probe_bootx_noscreen,
 676         .remove_new = offb_remove,
 677 };
 678
 679 static int offb_probe_display(struct platform_device *pdev)
 680 {
 681         offb_init_nodriver(pdev, pdev->dev.of_node, 0);
 682
 683         return 0;
 684 }
 685
 686 static const struct of_device_id offb_of_match_display[] = {
 687         { .compatible = "display", },
 688         { },
 689 };
 690 MODULE_DEVICE_TABLE(of, offb_of_match_display);
 691
 692 static struct platform_driver offb_driver_display = {
 693         .driver = {
 694                 .name = "of-display",
 695                 .of_match_table = offb_of_match_display,
 696         },
 697         .probe = offb_probe_display,
 698         .remove_new = offb_remove,
 699 };
 700
 701 static int __init offb_init(void)
 702 {
 703         if (fb_get_options("offb", NULL))
 704                 return -ENODEV;
 705
 706         platform_driver_register(&offb_driver_bootx_noscreen);
 707         platform_driver_register(&offb_driver_display);
 708
 709         return 0;
 710 }
 711 module_init(offb_init);
 712
 713 static void __exit offb_exit(void)
 714 {
 715         platform_driver_unregister(&offb_driver_display);
 716         platform_driver_unregister(&offb_driver_bootx_noscreen);
 717 }
 718 module_exit(offb_exit);
 719
 720 MODULE_DESCRIPTION("Open Firmware frame buffer device driver");
 721 MODULE_LICENSE("GPL");