linux/drivers/video/offb.c
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   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 */
  42enum {
  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
  54struct offb_par {
  55        volatile void __iomem *cmap_adr;
  56        volatile void __iomem *cmap_data;
  57        int cmap_type;
  58        int blanked;
  59};
  60
  61struct offb_par default_par;
  62
  63#ifdef CONFIG_PPC32
  64extern 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    /*
  95     *  Set a single color register. The values supplied are already
  96     *  rounded down to the hardware's capabilities (according to the
  97     *  entries in the var structure). Return != 0 for invalid regno.
  98     */
  99
 100static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 101                          u_int transp, struct fb_info *info)
 102{
 103        struct offb_par *par = (struct offb_par *) info->par;
 104
 105        if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 106                u32 *pal = info->pseudo_palette;
 107                u32 cr = red >> (16 - info->var.red.length);
 108                u32 cg = green >> (16 - info->var.green.length);
 109                u32 cb = blue >> (16 - info->var.blue.length);
 110                u32 value;
 111
 112                if (regno >= 16)
 113                        return -EINVAL;
 114
 115                value = (cr << info->var.red.offset) |
 116                        (cg << info->var.green.offset) |
 117                        (cb << info->var.blue.offset);
 118                if (info->var.transp.length > 0) {
 119                        u32 mask = (1 << info->var.transp.length) - 1;
 120                        mask <<= info->var.transp.offset;
 121                        value |= mask;
 122                }
 123                pal[regno] = value;
 124                return 0;
 125        }
 126
 127        if (regno > 255)
 128                return -EINVAL;
 129
 130        red >>= 8;
 131        green >>= 8;
 132        blue >>= 8;
 133
 134        if (!par->cmap_adr)
 135                return 0;
 136
 137        switch (par->cmap_type) {
 138        case cmap_simple:
 139                writeb(regno, par->cmap_adr);
 140                writeb(red, par->cmap_data);
 141                writeb(green, par->cmap_data);
 142                writeb(blue, par->cmap_data);
 143                break;
 144        case cmap_M3A:
 145                /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 146                out_le32(par->cmap_adr + 0x58,
 147                         in_le32(par->cmap_adr + 0x58) & ~0x20);
 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
 191static 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                        case cmap_r128:
 218                                /* Set palette index & data */
 219                                out_8(par->cmap_adr + 0xb0, i);
 220                                out_le32(par->cmap_adr + 0xb4, 0);
 221                                break;
 222                        case cmap_M3B:
 223                                /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 224                                out_le32(par->cmap_adr + 0x58,
 225                                         in_le32(par->cmap_adr + 0x58) | 0x20);
 226                                /* Set palette index & data */
 227                                out_8(par->cmap_adr + 0xb0, i);
 228                                out_le32(par->cmap_adr + 0xb4, 0);
 229                                break;
 230                        case cmap_radeon:
 231                                out_8(par->cmap_adr + 0xb0, i);
 232                                out_le32(par->cmap_adr + 0xb4, 0);
 233                                break;
 234                        case cmap_gxt2000:
 235                                out_le32(((unsigned __iomem *) par->cmap_adr) + i,
 236                                         0);
 237                                break;
 238                        case cmap_avivo:
 239                                writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 240                                writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 241                                writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 242                                writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 243                                writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 244                                writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 245                                break;
 246                        }
 247        } else
 248                fb_set_cmap(&info->cmap, info);
 249        return 0;
 250}
 251
 252static int offb_set_par(struct fb_info *info)
 253{
 254        struct offb_par *par = (struct offb_par *) info->par;
 255
 256        /* On avivo, initialize palette control */
 257        if (par->cmap_type == cmap_avivo) {
 258                writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL);
 259                writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE);
 260                writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN);
 261                writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED);
 262                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE);
 263                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN);
 264                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED);
 265                writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL);
 266                writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE);
 267                writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN);
 268                writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED);
 269                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE);
 270                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN);
 271                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED);
 272                writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 273                writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
 274                writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
 275                writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 276                writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
 277                writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
 278        }
 279        return 0;
 280}
 281
 282static void offb_destroy(struct fb_info *info)
 283{
 284        if (info->screen_base)
 285                iounmap(info->screen_base);
 286        release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
 287        framebuffer_release(info);
 288}
 289
 290static struct fb_ops offb_ops = {
 291        .owner          = THIS_MODULE,
 292        .fb_destroy     = offb_destroy,
 293        .fb_setcolreg   = offb_setcolreg,
 294        .fb_set_par     = offb_set_par,
 295        .fb_blank       = offb_blank,
 296        .fb_fillrect    = cfb_fillrect,
 297        .fb_copyarea    = cfb_copyarea,
 298        .fb_imageblit   = cfb_imageblit,
 299};
 300
 301static void __iomem *offb_map_reg(struct device_node *np, int index,
 302                                  unsigned long offset, unsigned long size)
 303{
 304        const u32 *addrp;
 305        u64 asize, taddr;
 306        unsigned int flags;
 307
 308        addrp = of_get_pci_address(np, index, &asize, &flags);
 309        if (addrp == NULL)
 310                addrp = of_get_address(np, index, &asize, &flags);
 311        if (addrp == NULL)
 312                return NULL;
 313        if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
 314                return NULL;
 315        if ((offset + size) > asize)
 316                return NULL;
 317        taddr = of_translate_address(np, addrp);
 318        if (taddr == OF_BAD_ADDR)
 319                return NULL;
 320        return ioremap(taddr + offset, size);
 321}
 322
 323static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp,
 324                                    const char *name, unsigned long address)
 325{
 326        struct offb_par *par = (struct offb_par *) info->par;
 327
 328        if (dp && !strncmp(name, "ATY,Rage128", 11)) {
 329                par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 330                if (par->cmap_adr)
 331                        par->cmap_type = cmap_r128;
 332        } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
 333                          || !strncmp(name, "ATY,RageM3p12A", 14))) {
 334                par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 335                if (par->cmap_adr)
 336                        par->cmap_type = cmap_M3A;
 337        } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
 338                par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 339                if (par->cmap_adr)
 340                        par->cmap_type = cmap_M3B;
 341        } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
 342                par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
 343                if (par->cmap_adr)
 344                        par->cmap_type = cmap_radeon;
 345        } else if (!strncmp(name, "ATY,", 4)) {
 346                unsigned long base = address & 0xff000000UL;
 347                par->cmap_adr =
 348                        ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
 349                par->cmap_data = par->cmap_adr + 1;
 350                par->cmap_type = cmap_simple;
 351        } else if (dp && (of_device_is_compatible(dp, "pci1014,b7") ||
 352                          of_device_is_compatible(dp, "pci1014,21c"))) {
 353                par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
 354                if (par->cmap_adr)
 355                        par->cmap_type = cmap_gxt2000;
 356        } else if (dp && !strncmp(name, "vga,Display-", 12)) {
 357                /* Look for AVIVO initialized by SLOF */
 358                struct device_node *pciparent = of_get_parent(dp);
 359                const u32 *vid, *did;
 360                vid = of_get_property(pciparent, "vendor-id", NULL);
 361                did = of_get_property(pciparent, "device-id", NULL);
 362                /* This will match most R5xx */
 363                if (vid && did && *vid == 0x1002 &&
 364                    ((*did >= 0x7100 && *did < 0x7800) ||
 365                     (*did >= 0x9400))) {
 366                        par->cmap_adr = offb_map_reg(pciparent, 2, 0, 0x10000);
 367                        if (par->cmap_adr)
 368                                par->cmap_type = cmap_avivo;
 369                }
 370                of_node_put(pciparent);
 371        } else if (dp && of_device_is_compatible(dp, "qemu,std-vga")) {
 372                const u32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 };
 373                u64 io_addr = of_translate_address(dp, io_of_addr);
 374                if (io_addr != OF_BAD_ADDR) {
 375                        par->cmap_adr = ioremap(io_addr + 0x3c8, 2);
 376                        if (par->cmap_adr) {
 377                                par->cmap_type = cmap_simple;
 378                                par->cmap_data = par->cmap_adr + 1;
 379                        }
 380                }
 381        }
 382        info->fix.visual = (par->cmap_type != cmap_unknown) ?
 383                FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
 384}
 385
 386static void __init offb_init_fb(const char *name, const char *full_name,
 387                                int width, int height, int depth,
 388                                int pitch, unsigned long address,
 389                                int foreign_endian, struct device_node *dp)
 390{
 391        unsigned long res_size = pitch * height;
 392        struct offb_par *par = &default_par;
 393        unsigned long res_start = address;
 394        struct fb_fix_screeninfo *fix;
 395        struct fb_var_screeninfo *var;
 396        struct fb_info *info;
 397
 398        if (!request_mem_region(res_start, res_size, "offb"))
 399                return;
 400
 401        printk(KERN_INFO
 402               "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 403               width, height, name, address, depth, pitch);
 404        if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
 405                printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
 406                       depth);
 407                release_mem_region(res_start, res_size);
 408                return;
 409        }
 410
 411        info = framebuffer_alloc(sizeof(u32) * 16, NULL);
 412        
 413        if (info == 0) {
 414                release_mem_region(res_start, res_size);
 415                return;
 416        }
 417
 418        fix = &info->fix;
 419        var = &info->var;
 420        info->par = par;
 421
 422        strcpy(fix->id, "OFfb ");
 423        strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 424        fix->id[sizeof(fix->id) - 1] = '\0';
 425
 426        var->xres = var->xres_virtual = width;
 427        var->yres = var->yres_virtual = height;
 428        fix->line_length = pitch;
 429
 430        fix->smem_start = address;
 431        fix->smem_len = pitch * height;
 432        fix->type = FB_TYPE_PACKED_PIXELS;
 433        fix->type_aux = 0;
 434
 435        par->cmap_type = cmap_unknown;
 436        if (depth == 8)
 437                offb_init_palette_hacks(info, dp, name, address);
 438        else
 439                fix->visual = FB_VISUAL_TRUECOLOR;
 440
 441        var->xoffset = var->yoffset = 0;
 442        switch (depth) {
 443        case 8:
 444                var->bits_per_pixel = 8;
 445                var->red.offset = 0;
 446                var->red.length = 8;
 447                var->green.offset = 0;
 448                var->green.length = 8;
 449                var->blue.offset = 0;
 450                var->blue.length = 8;
 451                var->transp.offset = 0;
 452                var->transp.length = 0;
 453                break;
 454        case 15:                /* RGB 555 */
 455                var->bits_per_pixel = 16;
 456                var->red.offset = 10;
 457                var->red.length = 5;
 458                var->green.offset = 5;
 459                var->green.length = 5;
 460                var->blue.offset = 0;
 461                var->blue.length = 5;
 462                var->transp.offset = 0;
 463                var->transp.length = 0;
 464                break;
 465        case 16:                /* RGB 565 */
 466                var->bits_per_pixel = 16;
 467                var->red.offset = 11;
 468                var->red.length = 5;
 469                var->green.offset = 5;
 470                var->green.length = 6;
 471                var->blue.offset = 0;
 472                var->blue.length = 5;
 473                var->transp.offset = 0;
 474                var->transp.length = 0;
 475                break;
 476        case 32:                /* RGB 888 */
 477                var->bits_per_pixel = 32;
 478                var->red.offset = 16;
 479                var->red.length = 8;
 480                var->green.offset = 8;
 481                var->green.length = 8;
 482                var->blue.offset = 0;
 483                var->blue.length = 8;
 484                var->transp.offset = 24;
 485                var->transp.length = 8;
 486                break;
 487        }
 488        var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 489            var->transp.msb_right = 0;
 490        var->grayscale = 0;
 491        var->nonstd = 0;
 492        var->activate = 0;
 493        var->height = var->width = -1;
 494        var->pixclock = 10000;
 495        var->left_margin = var->right_margin = 16;
 496        var->upper_margin = var->lower_margin = 16;
 497        var->hsync_len = var->vsync_len = 8;
 498        var->sync = 0;
 499        var->vmode = FB_VMODE_NONINTERLACED;
 500
 501        /* set offb aperture size for generic probing */
 502        info->apertures = alloc_apertures(1);
 503        if (!info->apertures)
 504                goto out_aper;
 505        info->apertures->ranges[0].base = address;
 506        info->apertures->ranges[0].size = fix->smem_len;
 507
 508        info->fbops = &offb_ops;
 509        info->screen_base = ioremap(address, fix->smem_len);
 510        info->pseudo_palette = (void *) (info + 1);
 511        info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE | foreign_endian;
 512
 513        fb_alloc_cmap(&info->cmap, 256, 0);
 514
 515        if (register_framebuffer(info) < 0)
 516                goto out_err;
 517
 518        printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
 519               info->node, full_name);
 520        return;
 521
 522out_err:
 523        iounmap(info->screen_base);
 524out_aper:
 525        iounmap(par->cmap_adr);
 526        par->cmap_adr = NULL;
 527        framebuffer_release(info);
 528        release_mem_region(res_start, res_size);
 529}
 530
 531
 532static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
 533{
 534        unsigned int len;
 535        int i, width = 640, height = 480, depth = 8, pitch = 640;
 536        unsigned int flags, rsize, addr_prop = 0;
 537        unsigned long max_size = 0;
 538        u64 rstart, address = OF_BAD_ADDR;
 539        const u32 *pp, *addrp, *up;
 540        u64 asize;
 541        int foreign_endian = 0;
 542
 543#ifdef __BIG_ENDIAN
 544        if (of_get_property(dp, "little-endian", NULL))
 545                foreign_endian = FBINFO_FOREIGN_ENDIAN;
 546#else
 547        if (of_get_property(dp, "big-endian", NULL))
 548                foreign_endian = FBINFO_FOREIGN_ENDIAN;
 549#endif
 550
 551        pp = of_get_property(dp, "linux,bootx-depth", &len);
 552        if (pp == NULL)
 553                pp = of_get_property(dp, "depth", &len);
 554        if (pp && len == sizeof(u32))
 555                depth = *pp;
 556
 557        pp = of_get_property(dp, "linux,bootx-width", &len);
 558        if (pp == NULL)
 559                pp = of_get_property(dp, "width", &len);
 560        if (pp && len == sizeof(u32))
 561                width = *pp;
 562
 563        pp = of_get_property(dp, "linux,bootx-height", &len);
 564        if (pp == NULL)
 565                pp = of_get_property(dp, "height", &len);
 566        if (pp && len == sizeof(u32))
 567                height = *pp;
 568
 569        pp = of_get_property(dp, "linux,bootx-linebytes", &len);
 570        if (pp == NULL)
 571                pp = of_get_property(dp, "linebytes", &len);
 572        if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
 573                pitch = *pp;
 574        else
 575                pitch = width * ((depth + 7) / 8);
 576
 577        rsize = (unsigned long)pitch * (unsigned long)height;
 578
 579        /* Ok, now we try to figure out the address of the framebuffer.
 580         *
 581         * Unfortunately, Open Firmware doesn't provide a standard way to do
 582         * so. All we can do is a dodgy heuristic that happens to work in
 583         * practice. On most machines, the "address" property contains what
 584         * we need, though not on Matrox cards found in IBM machines. What I've
 585         * found that appears to give good results is to go through the PCI
 586         * ranges and pick one that is both big enough and if possible encloses
 587         * the "address" property. If none match, we pick the biggest
 588         */
 589        up = of_get_property(dp, "linux,bootx-addr", &len);
 590        if (up == NULL)
 591                up = of_get_property(dp, "address", &len);
 592        if (up && len == sizeof(u32))
 593                addr_prop = *up;
 594
 595        /* Hack for when BootX is passing us */
 596        if (no_real_node)
 597                goto skip_addr;
 598
 599        for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
 600                     != NULL; i++) {
 601                int match_addrp = 0;
 602
 603                if (!(flags & IORESOURCE_MEM))
 604                        continue;
 605                if (asize < rsize)
 606                        continue;
 607                rstart = of_translate_address(dp, addrp);
 608                if (rstart == OF_BAD_ADDR)
 609                        continue;
 610                if (addr_prop && (rstart <= addr_prop) &&
 611                    ((rstart + asize) >= (addr_prop + rsize)))
 612                        match_addrp = 1;
 613                if (match_addrp) {
 614                        address = addr_prop;
 615                        break;
 616                }
 617                if (rsize > max_size) {
 618                        max_size = rsize;
 619                        address = OF_BAD_ADDR;
 620                }
 621
 622                if (address == OF_BAD_ADDR)
 623                        address = rstart;
 624        }
 625 skip_addr:
 626        if (address == OF_BAD_ADDR && addr_prop)
 627                address = (u64)addr_prop;
 628        if (address != OF_BAD_ADDR) {
 629                /* kludge for valkyrie */
 630                if (strcmp(dp->name, "valkyrie") == 0)
 631                        address += 0x1000;
 632                offb_init_fb(no_real_node ? "bootx" : dp->name,
 633                             no_real_node ? "display" : dp->full_name,
 634                             width, height, depth, pitch, address,
 635                             foreign_endian, no_real_node ? NULL : dp);
 636        }
 637}
 638
 639static int __init offb_init(void)
 640{
 641        struct device_node *dp = NULL, *boot_disp = NULL;
 642
 643        if (fb_get_options("offb", NULL))
 644                return -ENODEV;
 645
 646        /* Check if we have a MacOS display without a node spec */
 647        if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {
 648                /* The old code tried to work out which node was the MacOS
 649                 * display based on the address. I'm dropping that since the
 650                 * lack of a node spec only happens with old BootX versions
 651                 * (users can update) and with this code, they'll still get
 652                 * a display (just not the palette hacks).
 653                 */
 654                offb_init_nodriver(of_chosen, 1);
 655        }
 656
 657        for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 658                if (of_get_property(dp, "linux,opened", NULL) &&
 659                    of_get_property(dp, "linux,boot-display", NULL)) {
 660                        boot_disp = dp;
 661                        offb_init_nodriver(dp, 0);
 662                }
 663        }
 664        for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 665                if (of_get_property(dp, "linux,opened", NULL) &&
 666                    dp != boot_disp)
 667                        offb_init_nodriver(dp, 0);
 668        }
 669
 670        return 0;
 671}
 672
 673
 674module_init(offb_init);
 675MODULE_LICENSE("GPL");
 676
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