linux/drivers/video/fbdev/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_PPC32
  32#include <asm/bootx.h>
  33#endif
  34
  35#include "macmodes.h"
  36
  37/* Supported palette hacks */
  38enum {
  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
  50struct offb_par {
  51        volatile void __iomem *cmap_adr;
  52        volatile void __iomem *cmap_data;
  53        int cmap_type;
  54        int blanked;
  55};
  56
  57struct offb_par default_par;
  58
  59#ifdef CONFIG_PPC32
  60extern 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
  96static 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                fallthrough;
 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
 188static 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                                fallthrough;
 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
 250static 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
 280static 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
 289static const 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
 300static 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
 322static 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
 389static void offb_init_fb(struct platform_device *parent, 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, &parent->dev);
 414
 415        if (!info) {
 416                release_mem_region(res_start, res_size);
 417                return;
 418        }
 419        platform_set_drvdata(parent, info);
 420
 421        fix = &info->fix;
 422        var = &info->var;
 423        info->par = par;
 424
 425        if (name) {
 426                strcpy(fix->id, "OFfb ");
 427                strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 428                fix->id[sizeof(fix->id) - 1] = '\0';
 429        } else
 430                snprintf(fix->id, sizeof(fix->id), "OFfb %pOFn", dp);
 431
 432
 433        var->xres = var->xres_virtual = width;
 434        var->yres = var->yres_virtual = height;
 435        fix->line_length = pitch;
 436
 437        fix->smem_start = address;
 438        fix->smem_len = pitch * height;
 439        fix->type = FB_TYPE_PACKED_PIXELS;
 440        fix->type_aux = 0;
 441
 442        par->cmap_type = cmap_unknown;
 443        if (depth == 8)
 444                offb_init_palette_hacks(info, dp, address);
 445        else
 446                fix->visual = FB_VISUAL_TRUECOLOR;
 447
 448        var->xoffset = var->yoffset = 0;
 449        switch (depth) {
 450        case 8:
 451                var->bits_per_pixel = 8;
 452                var->red.offset = 0;
 453                var->red.length = 8;
 454                var->green.offset = 0;
 455                var->green.length = 8;
 456                var->blue.offset = 0;
 457                var->blue.length = 8;
 458                var->transp.offset = 0;
 459                var->transp.length = 0;
 460                break;
 461        case 15:                /* RGB 555 */
 462                var->bits_per_pixel = 16;
 463                var->red.offset = 10;
 464                var->red.length = 5;
 465                var->green.offset = 5;
 466                var->green.length = 5;
 467                var->blue.offset = 0;
 468                var->blue.length = 5;
 469                var->transp.offset = 0;
 470                var->transp.length = 0;
 471                break;
 472        case 16:                /* RGB 565 */
 473                var->bits_per_pixel = 16;
 474                var->red.offset = 11;
 475                var->red.length = 5;
 476                var->green.offset = 5;
 477                var->green.length = 6;
 478                var->blue.offset = 0;
 479                var->blue.length = 5;
 480                var->transp.offset = 0;
 481                var->transp.length = 0;
 482                break;
 483        case 32:                /* RGB 888 */
 484                var->bits_per_pixel = 32;
 485                var->red.offset = 16;
 486                var->red.length = 8;
 487                var->green.offset = 8;
 488                var->green.length = 8;
 489                var->blue.offset = 0;
 490                var->blue.length = 8;
 491                var->transp.offset = 24;
 492                var->transp.length = 8;
 493                break;
 494        }
 495        var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 496            var->transp.msb_right = 0;
 497        var->grayscale = 0;
 498        var->nonstd = 0;
 499        var->activate = 0;
 500        var->height = var->width = -1;
 501        var->pixclock = 10000;
 502        var->left_margin = var->right_margin = 16;
 503        var->upper_margin = var->lower_margin = 16;
 504        var->hsync_len = var->vsync_len = 8;
 505        var->sync = 0;
 506        var->vmode = FB_VMODE_NONINTERLACED;
 507
 508        /* set offb aperture size for generic probing */
 509        info->apertures = alloc_apertures(1);
 510        if (!info->apertures)
 511                goto out_aper;
 512        info->apertures->ranges[0].base = address;
 513        info->apertures->ranges[0].size = fix->smem_len;
 514
 515        info->fbops = &offb_ops;
 516        info->screen_base = ioremap(address, fix->smem_len);
 517        info->pseudo_palette = (void *) (info + 1);
 518        info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE | foreign_endian;
 519
 520        fb_alloc_cmap(&info->cmap, 256, 0);
 521
 522        if (register_framebuffer(info) < 0)
 523                goto out_err;
 524
 525        fb_info(info, "Open Firmware frame buffer device on %pOF\n", dp);
 526        return;
 527
 528out_err:
 529        fb_dealloc_cmap(&info->cmap);
 530        iounmap(info->screen_base);
 531out_aper:
 532        iounmap(par->cmap_adr);
 533        par->cmap_adr = NULL;
 534        framebuffer_release(info);
 535        release_mem_region(res_start, res_size);
 536}
 537
 538
 539static void offb_init_nodriver(struct platform_device *parent, struct device_node *dp,
 540                               int no_real_node)
 541{
 542        unsigned int len;
 543        int i, width = 640, height = 480, depth = 8, pitch = 640;
 544        unsigned int flags, rsize, addr_prop = 0;
 545        unsigned long max_size = 0;
 546        u64 rstart, address = OF_BAD_ADDR;
 547        const __be32 *pp, *addrp, *up;
 548        u64 asize;
 549        int foreign_endian = 0;
 550
 551#ifdef __BIG_ENDIAN
 552        if (of_get_property(dp, "little-endian", NULL))
 553                foreign_endian = FBINFO_FOREIGN_ENDIAN;
 554#else
 555        if (of_get_property(dp, "big-endian", NULL))
 556                foreign_endian = FBINFO_FOREIGN_ENDIAN;
 557#endif
 558
 559        pp = of_get_property(dp, "linux,bootx-depth", &len);
 560        if (pp == NULL)
 561                pp = of_get_property(dp, "depth", &len);
 562        if (pp && len == sizeof(u32))
 563                depth = be32_to_cpup(pp);
 564
 565        pp = of_get_property(dp, "linux,bootx-width", &len);
 566        if (pp == NULL)
 567                pp = of_get_property(dp, "width", &len);
 568        if (pp && len == sizeof(u32))
 569                width = be32_to_cpup(pp);
 570
 571        pp = of_get_property(dp, "linux,bootx-height", &len);
 572        if (pp == NULL)
 573                pp = of_get_property(dp, "height", &len);
 574        if (pp && len == sizeof(u32))
 575                height = be32_to_cpup(pp);
 576
 577        pp = of_get_property(dp, "linux,bootx-linebytes", &len);
 578        if (pp == NULL)
 579                pp = of_get_property(dp, "linebytes", &len);
 580        if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
 581                pitch = be32_to_cpup(pp);
 582        else
 583                pitch = width * ((depth + 7) / 8);
 584
 585        rsize = (unsigned long)pitch * (unsigned long)height;
 586
 587        /* Ok, now we try to figure out the address of the framebuffer.
 588         *
 589         * Unfortunately, Open Firmware doesn't provide a standard way to do
 590         * so. All we can do is a dodgy heuristic that happens to work in
 591         * practice. On most machines, the "address" property contains what
 592         * we need, though not on Matrox cards found in IBM machines. What I've
 593         * found that appears to give good results is to go through the PCI
 594         * ranges and pick one that is both big enough and if possible encloses
 595         * the "address" property. If none match, we pick the biggest
 596         */
 597        up = of_get_property(dp, "linux,bootx-addr", &len);
 598        if (up == NULL)
 599                up = of_get_property(dp, "address", &len);
 600        if (up && len == sizeof(u32))
 601                addr_prop = *up;
 602
 603        /* Hack for when BootX is passing us */
 604        if (no_real_node)
 605                goto skip_addr;
 606
 607        for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
 608                     != NULL; i++) {
 609                int match_addrp = 0;
 610
 611                if (!(flags & IORESOURCE_MEM))
 612                        continue;
 613                if (asize < rsize)
 614                        continue;
 615                rstart = of_translate_address(dp, addrp);
 616                if (rstart == OF_BAD_ADDR)
 617                        continue;
 618                if (addr_prop && (rstart <= addr_prop) &&
 619                    ((rstart + asize) >= (addr_prop + rsize)))
 620                        match_addrp = 1;
 621                if (match_addrp) {
 622                        address = addr_prop;
 623                        break;
 624                }
 625                if (rsize > max_size) {
 626                        max_size = rsize;
 627                        address = OF_BAD_ADDR;
 628                }
 629
 630                if (address == OF_BAD_ADDR)
 631                        address = rstart;
 632        }
 633 skip_addr:
 634        if (address == OF_BAD_ADDR && addr_prop)
 635                address = (u64)addr_prop;
 636        if (address != OF_BAD_ADDR) {
 637#ifdef CONFIG_PCI
 638                const __be32 *vidp, *didp;
 639                u32 vid, did;
 640                struct pci_dev *pdev;
 641
 642                vidp = of_get_property(dp, "vendor-id", NULL);
 643                didp = of_get_property(dp, "device-id", NULL);
 644                if (vidp && didp) {
 645                        vid = be32_to_cpup(vidp);
 646                        did = be32_to_cpup(didp);
 647                        pdev = pci_get_device(vid, did, NULL);
 648                        if (!pdev || pci_enable_device(pdev))
 649                                return;
 650                }
 651#endif
 652                /* kludge for valkyrie */
 653                if (of_node_name_eq(dp, "valkyrie"))
 654                        address += 0x1000;
 655                offb_init_fb(parent, no_real_node ? "bootx" : NULL,
 656                             width, height, depth, pitch, address,
 657                             foreign_endian, no_real_node ? NULL : dp);
 658        }
 659}
 660
 661static int offb_remove(struct platform_device *pdev)
 662{
 663        struct fb_info *info = platform_get_drvdata(pdev);
 664
 665        if (info)
 666                unregister_framebuffer(info);
 667
 668        return 0;
 669}
 670
 671static int offb_probe_bootx_noscreen(struct platform_device *pdev)
 672{
 673        offb_init_nodriver(pdev, of_chosen, 1);
 674
 675        return 0;
 676}
 677
 678static struct platform_driver offb_driver_bootx_noscreen = {
 679        .driver = {
 680                .name = "bootx-noscreen",
 681        },
 682        .probe = offb_probe_bootx_noscreen,
 683        .remove = offb_remove,
 684};
 685
 686static int offb_probe_display(struct platform_device *pdev)
 687{
 688        offb_init_nodriver(pdev, pdev->dev.of_node, 0);
 689
 690        return 0;
 691}
 692
 693static const struct of_device_id offb_of_match_display[] = {
 694        { .compatible = "display", },
 695        { },
 696};
 697MODULE_DEVICE_TABLE(of, offb_of_match_display);
 698
 699static struct platform_driver offb_driver_display = {
 700        .driver = {
 701                .name = "of-display",
 702                .of_match_table = offb_of_match_display,
 703        },
 704        .probe = offb_probe_display,
 705        .remove = offb_remove,
 706};
 707
 708static int __init offb_init(void)
 709{
 710        if (fb_get_options("offb", NULL))
 711                return -ENODEV;
 712
 713        platform_driver_register(&offb_driver_bootx_noscreen);
 714        platform_driver_register(&offb_driver_display);
 715
 716        return 0;
 717}
 718module_init(offb_init);
 719
 720static void __exit offb_exit(void)
 721{
 722        platform_driver_unregister(&offb_driver_display);
 723        platform_driver_unregister(&offb_driver_bootx_noscreen);
 724}
 725module_exit(offb_exit);
 726
 727MODULE_LICENSE("GPL");
 728