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/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 <linux/platform_device.h>
  30 #include <asm/io.h>
  31
  32 #ifdef CONFIG_PPC32
  33 #include <asm/bootx.h>
  34 #endif
  35
  36 #include "macmodes.h"
  37
  38 /* Supported palette hacks */
  39 enum {
  40         cmap_unknown,
  41         cmap_simple,            /* ATI Mach64 */
  42         cmap_r128,              /* ATI Rage128 */
  43         cmap_M3A,               /* ATI Rage Mobility M3 Head A */
  44         cmap_M3B,               /* ATI Rage Mobility M3 Head B */
  45         cmap_radeon,            /* ATI Radeon */
  46         cmap_gxt2000,           /* IBM GXT2000 */
  47         cmap_avivo,             /* ATI R5xx */
  48         cmap_qemu,              /* qemu vga */
  49 };
  50
  51 struct offb_par {
  52         volatile void __iomem *cmap_adr;
  53         volatile void __iomem *cmap_data;
  54         int cmap_type;
  55         int blanked;
  56 };
  57
  58 struct offb_par default_par;
  59
  60 #ifdef CONFIG_PPC32
  61 extern boot_infos_t *boot_infos;
  62 #endif
  63
  64 /* Definitions used by the Avivo palette hack */
  65 #define AVIVO_DC_LUT_RW_SELECT                  0x6480
  66 #define AVIVO_DC_LUT_RW_MODE                    0x6484
  67 #define AVIVO_DC_LUT_RW_INDEX                   0x6488
  68 #define AVIVO_DC_LUT_SEQ_COLOR                  0x648c
  69 #define AVIVO_DC_LUT_PWL_DATA                   0x6490
  70 #define AVIVO_DC_LUT_30_COLOR                   0x6494
  71 #define AVIVO_DC_LUT_READ_PIPE_SELECT           0x6498
  72 #define AVIVO_DC_LUT_WRITE_EN_MASK              0x649c
  73 #define AVIVO_DC_LUT_AUTOFILL                   0x64a0
  74
  75 #define AVIVO_DC_LUTA_CONTROL                   0x64c0
  76 #define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE         0x64c4
  77 #define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN        0x64c8
  78 #define AVIVO_DC_LUTA_BLACK_OFFSET_RED          0x64cc
  79 #define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE         0x64d0
  80 #define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN        0x64d4
  81 #define AVIVO_DC_LUTA_WHITE_OFFSET_RED          0x64d8
  82
  83 #define AVIVO_DC_LUTB_CONTROL                   0x6cc0
  84 #define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE         0x6cc4
  85 #define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN        0x6cc8
  86 #define AVIVO_DC_LUTB_BLACK_OFFSET_RED          0x6ccc
  87 #define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE         0x6cd0
  88 #define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN        0x6cd4
  89 #define AVIVO_DC_LUTB_WHITE_OFFSET_RED          0x6cd8
  90
  91     /*
  92      *  Set a single color register. The values supplied are already
  93      *  rounded down to the hardware's capabilities (according to the
  94      *  entries in the var structure). Return != 0 for invalid regno.
  95      */
  96
  97 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  98                           u_int transp, struct fb_info *info)
  99 {
 100         struct offb_par *par = (struct offb_par *) info->par;
 101
 102         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 103                 u32 *pal = info->pseudo_palette;
 104                 u32 cr = red >> (16 - info->var.red.length);
 105                 u32 cg = green >> (16 - info->var.green.length);
 106                 u32 cb = blue >> (16 - info->var.blue.length);
 107                 u32 value;
 108
 109                 if (regno >= 16)
 110                         return -EINVAL;
 111
 112                 value = (cr << info->var.red.offset) |
 113                         (cg << info->var.green.offset) |
 114                         (cb << info->var.blue.offset);
 115                 if (info->var.transp.length > 0) {
 116                         u32 mask = (1 << info->var.transp.length) - 1;
 117                         mask <<= info->var.transp.offset;
 118                         value |= mask;
 119                 }
 120                 pal[regno] = value;
 121                 return 0;
 122         }
 123
 124         if (regno > 255)
 125                 return -EINVAL;
 126
 127         red >>= 8;
 128         green >>= 8;
 129         blue >>= 8;
 130
 131         if (!par->cmap_adr)
 132                 return 0;
 133
 134         switch (par->cmap_type) {
 135         case cmap_simple:
 136                 writeb(regno, par->cmap_adr);
 137                 writeb(red, par->cmap_data);
 138                 writeb(green, par->cmap_data);
 139                 writeb(blue, par->cmap_data);
 140                 break;
 141         case cmap_M3A:
 142                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 143                 out_le32(par->cmap_adr + 0x58,
 144                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 145                 fallthrough;
 146         case cmap_r128:
 147                 /* Set palette index & data */
 148                 out_8(par->cmap_adr + 0xb0, regno);
 149                 out_le32(par->cmap_adr + 0xb4,
 150                          (red << 16 | green << 8 | blue));
 151                 break;
 152         case cmap_M3B:
 153                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 154                 out_le32(par->cmap_adr + 0x58,
 155                          in_le32(par->cmap_adr + 0x58) | 0x20);
 156                 /* Set palette index & data */
 157                 out_8(par->cmap_adr + 0xb0, regno);
 158                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 159                 break;
 160         case cmap_radeon:
 161                 /* Set palette index & data (could be smarter) */
 162                 out_8(par->cmap_adr + 0xb0, regno);
 163                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 164                 break;
 165         case cmap_gxt2000:
 166                 out_le32(((unsigned __iomem *) par->cmap_adr) + regno,
 167                          (red << 16 | green << 8 | blue));
 168                 break;
 169         case cmap_avivo:
 170                 /* Write to both LUTs for now */
 171                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 172                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 173                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
 174                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 175                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 176                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 177                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
 178                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 179                 break;
 180         }
 181
 182         return 0;
 183 }
 184
 185     /*
 186      *  Blank the display.
 187      */
 188
 189 static int offb_blank(int blank, struct fb_info *info)
 190 {
 191         struct offb_par *par = (struct offb_par *) info->par;
 192         int i, j;
 193
 194         if (!par->cmap_adr)
 195                 return 0;
 196
 197         if (!par->blanked)
 198                 if (!blank)
 199                         return 0;
 200
 201         par->blanked = blank;
 202
 203         if (blank)
 204                 for (i = 0; i < 256; i++) {
 205                         switch (par->cmap_type) {
 206                         case cmap_simple:
 207                                 writeb(i, par->cmap_adr);
 208                                 for (j = 0; j < 3; j++)
 209                                         writeb(0, par->cmap_data);
 210                                 break;
 211                         case cmap_M3A:
 212                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 213                                 out_le32(par->cmap_adr + 0x58,
 214                                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 215                                 fallthrough;
 216                         case cmap_r128:
 217                                 /* Set palette index & data */
 218                                 out_8(par->cmap_adr + 0xb0, i);
 219                                 out_le32(par->cmap_adr + 0xb4, 0);
 220                                 break;
 221                         case cmap_M3B:
 222                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 223                                 out_le32(par->cmap_adr + 0x58,
 224                                          in_le32(par->cmap_adr + 0x58) | 0x20);
 225                                 /* Set palette index & data */
 226                                 out_8(par->cmap_adr + 0xb0, i);
 227                                 out_le32(par->cmap_adr + 0xb4, 0);
 228                                 break;
 229                         case cmap_radeon:
 230                                 out_8(par->cmap_adr + 0xb0, i);
 231                                 out_le32(par->cmap_adr + 0xb4, 0);
 232                                 break;
 233                         case cmap_gxt2000:
 234                                 out_le32(((unsigned __iomem *) par->cmap_adr) + i,
 235                                          0);
 236                                 break;
 237                         case cmap_avivo:
 238                                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 239                                 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 240                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 241                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 242                                 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
 243                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
 244                                 break;
 245                         }
 246         } else
 247                 fb_set_cmap(&info->cmap, info);
 248         return 0;
 249 }
 250
 251 static int offb_set_par(struct fb_info *info)
 252 {
 253         struct offb_par *par = (struct offb_par *) info->par;
 254
 255         /* On avivo, initialize palette control */
 256         if (par->cmap_type == cmap_avivo) {
 257                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL);
 258                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE);
 259                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN);
 260                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED);
 261                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE);
 262                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN);
 263                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED);
 264                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL);
 265                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE);
 266                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN);
 267                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED);
 268                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE);
 269                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN);
 270                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED);
 271                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 272                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
 273                 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
 274                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
 275                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
 276                 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
 277         }
 278         return 0;
 279 }
 280
 281 static void offb_destroy(struct fb_info *info)
 282 {
 283         if (info->screen_base)
 284                 iounmap(info->screen_base);
 285         release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
 286         fb_dealloc_cmap(&info->cmap);
 287         framebuffer_release(info);
 288 }
 289
 290 static const 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
 301 static void __iomem *offb_map_reg(struct device_node *np, int index,
 302                                   unsigned long offset, unsigned long size)
 303 {
 304         const __be32 *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
 323 static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp,
 324                                     unsigned long address)
 325 {
 326         struct offb_par *par = (struct offb_par *) info->par;
 327
 328         if (of_node_name_prefix(dp, "ATY,Rage128")) {
 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 (of_node_name_prefix(dp, "ATY,RageM3pA") ||
 333                    of_node_name_prefix(dp, "ATY,RageM3p12A")) {
 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 (of_node_name_prefix(dp, "ATY,RageM3pB")) {
 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 (of_node_name_prefix(dp, "ATY,Rage6")) {
 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 (of_node_name_prefix(dp, "ATY,")) {
 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 (of_node_name_prefix(dp, "vga,Display-")) {
 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 #ifdef __BIG_ENDIAN
 373                 const __be32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 };
 374 #else
 375                 const __be32 io_of_addr[3] = { 0x00000001, 0x0, 0x0 };
 376 #endif
 377                 u64 io_addr = of_translate_address(dp, io_of_addr);
 378                 if (io_addr != OF_BAD_ADDR) {
 379                         par->cmap_adr = ioremap(io_addr + 0x3c8, 2);
 380                         if (par->cmap_adr) {
 381                                 par->cmap_type = cmap_simple;
 382                                 par->cmap_data = par->cmap_adr + 1;
 383                         }
 384                 }
 385         }
 386         info->fix.visual = (par->cmap_type != cmap_unknown) ?
 387                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
 388 }
 389
 390 static void offb_init_fb(struct platform_device *parent, const char *name,
 391                          int width, int height, int depth,
 392                          int pitch, unsigned long address,
 393                          int foreign_endian, struct device_node *dp)
 394 {
 395         unsigned long res_size = pitch * height;
 396         struct offb_par *par = &default_par;
 397         unsigned long res_start = address;
 398         struct fb_fix_screeninfo *fix;
 399         struct fb_var_screeninfo *var;
 400         struct fb_info *info;
 401
 402         if (!request_mem_region(res_start, res_size, "offb"))
 403                 return;
 404
 405         printk(KERN_INFO
 406                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 407                width, height, name, address, depth, pitch);
 408         if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
 409                 printk(KERN_ERR "%pOF: can't use depth = %d\n", dp, depth);
 410                 release_mem_region(res_start, res_size);
 411                 return;
 412         }
 413
 414         info = framebuffer_alloc(sizeof(u32) * 16, &parent->dev);
 415
 416         if (!info) {
 417                 release_mem_region(res_start, res_size);
 418                 return;
 419         }
 420         platform_set_drvdata(parent, info);
 421
 422         fix = &info->fix;
 423         var = &info->var;
 424         info->par = par;
 425
 426         if (name) {
 427                 strcpy(fix->id, "OFfb ");
 428                 strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 429                 fix->id[sizeof(fix->id) - 1] = '\0';
 430         } else
 431                 snprintf(fix->id, sizeof(fix->id), "OFfb %pOFn", dp);
 432
 433
 434         var->xres = var->xres_virtual = width;
 435         var->yres = var->yres_virtual = height;
 436         fix->line_length = pitch;
 437
 438         fix->smem_start = address;
 439         fix->smem_len = pitch * height;
 440         fix->type = FB_TYPE_PACKED_PIXELS;
 441         fix->type_aux = 0;
 442
 443         par->cmap_type = cmap_unknown;
 444         if (depth == 8)
 445                 offb_init_palette_hacks(info, dp, address);
 446         else
 447                 fix->visual = FB_VISUAL_TRUECOLOR;
 448
 449         var->xoffset = var->yoffset = 0;
 450         switch (depth) {
 451         case 8:
 452                 var->bits_per_pixel = 8;
 453                 var->red.offset = 0;
 454                 var->red.length = 8;
 455                 var->green.offset = 0;
 456                 var->green.length = 8;
 457                 var->blue.offset = 0;
 458                 var->blue.length = 8;
 459                 var->transp.offset = 0;
 460                 var->transp.length = 0;
 461                 break;
 462         case 15:                /* RGB 555 */
 463                 var->bits_per_pixel = 16;
 464                 var->red.offset = 10;
 465                 var->red.length = 5;
 466                 var->green.offset = 5;
 467                 var->green.length = 5;
 468                 var->blue.offset = 0;
 469                 var->blue.length = 5;
 470                 var->transp.offset = 0;
 471                 var->transp.length = 0;
 472                 break;
 473         case 16:                /* RGB 565 */
 474                 var->bits_per_pixel = 16;
 475                 var->red.offset = 11;
 476                 var->red.length = 5;
 477                 var->green.offset = 5;
 478                 var->green.length = 6;
 479                 var->blue.offset = 0;
 480                 var->blue.length = 5;
 481                 var->transp.offset = 0;
 482                 var->transp.length = 0;
 483                 break;
 484         case 32:                /* RGB 888 */
 485                 var->bits_per_pixel = 32;
 486                 var->red.offset = 16;
 487                 var->red.length = 8;
 488                 var->green.offset = 8;
 489                 var->green.length = 8;
 490                 var->blue.offset = 0;
 491                 var->blue.length = 8;
 492                 var->transp.offset = 24;
 493                 var->transp.length = 8;
 494                 break;
 495         }
 496         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 497             var->transp.msb_right = 0;
 498         var->grayscale = 0;
 499         var->nonstd = 0;
 500         var->activate = 0;
 501         var->height = var->width = -1;
 502         var->pixclock = 10000;
 503         var->left_margin = var->right_margin = 16;
 504         var->upper_margin = var->lower_margin = 16;
 505         var->hsync_len = var->vsync_len = 8;
 506         var->sync = 0;
 507         var->vmode = FB_VMODE_NONINTERLACED;
 508
 509         /* set offb aperture size for generic probing */
 510         info->apertures = alloc_apertures(1);
 511         if (!info->apertures)
 512                 goto out_aper;
 513         info->apertures->ranges[0].base = address;
 514         info->apertures->ranges[0].size = fix->smem_len;
 515
 516         info->fbops = &offb_ops;
 517         info->screen_base = ioremap(address, fix->smem_len);
 518         info->pseudo_palette = (void *) (info + 1);
 519         info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE | foreign_endian;
 520
 521         fb_alloc_cmap(&info->cmap, 256, 0);
 522
 523         if (register_framebuffer(info) < 0)
 524                 goto out_err;
 525
 526         fb_info(info, "Open Firmware frame buffer device on %pOF\n", dp);
 527         return;
 528
 529 out_err:
 530         fb_dealloc_cmap(&info->cmap);
 531         iounmap(info->screen_base);
 532 out_aper:
 533         iounmap(par->cmap_adr);
 534         par->cmap_adr = NULL;
 535         framebuffer_release(info);
 536         release_mem_region(res_start, res_size);
 537 }
 538
 539
 540 static void offb_init_nodriver(struct platform_device *parent, struct device_node *dp,
 541                                int no_real_node)
 542 {
 543         unsigned int len;
 544         int i, width = 640, height = 480, depth = 8, pitch = 640;
 545         unsigned int flags, rsize, addr_prop = 0;
 546         unsigned long max_size = 0;
 547         u64 rstart, address = OF_BAD_ADDR;
 548         const __be32 *pp, *addrp, *up;
 549         u64 asize;
 550         int foreign_endian = 0;
 551
 552 #ifdef __BIG_ENDIAN
 553         if (of_get_property(dp, "little-endian", NULL))
 554                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
 555 #else
 556         if (of_get_property(dp, "big-endian", NULL))
 557                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
 558 #endif
 559
 560         pp = of_get_property(dp, "linux,bootx-depth", &len);
 561         if (pp == NULL)
 562                 pp = of_get_property(dp, "depth", &len);
 563         if (pp && len == sizeof(u32))
 564                 depth = be32_to_cpup(pp);
 565
 566         pp = of_get_property(dp, "linux,bootx-width", &len);
 567         if (pp == NULL)
 568                 pp = of_get_property(dp, "width", &len);
 569         if (pp && len == sizeof(u32))
 570                 width = be32_to_cpup(pp);
 571
 572         pp = of_get_property(dp, "linux,bootx-height", &len);
 573         if (pp == NULL)
 574                 pp = of_get_property(dp, "height", &len);
 575         if (pp && len == sizeof(u32))
 576                 height = be32_to_cpup(pp);
 577
 578         pp = of_get_property(dp, "linux,bootx-linebytes", &len);
 579         if (pp == NULL)
 580                 pp = of_get_property(dp, "linebytes", &len);
 581         if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
 582                 pitch = be32_to_cpup(pp);
 583         else
 584                 pitch = width * ((depth + 7) / 8);
 585
 586         rsize = (unsigned long)pitch * (unsigned long)height;
 587
 588         /* Ok, now we try to figure out the address of the framebuffer.
 589          *
 590          * Unfortunately, Open Firmware doesn't provide a standard way to do
 591          * so. All we can do is a dodgy heuristic that happens to work in
 592          * practice. On most machines, the "address" property contains what
 593          * we need, though not on Matrox cards found in IBM machines. What I've
 594          * found that appears to give good results is to go through the PCI
 595          * ranges and pick one that is both big enough and if possible encloses
 596          * the "address" property. If none match, we pick the biggest
 597          */
 598         up = of_get_property(dp, "linux,bootx-addr", &len);
 599         if (up == NULL)
 600                 up = of_get_property(dp, "address", &len);
 601         if (up && len == sizeof(u32))
 602                 addr_prop = *up;
 603
 604         /* Hack for when BootX is passing us */
 605         if (no_real_node)
 606                 goto skip_addr;
 607
 608         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
 609                      != NULL; i++) {
 610                 int match_addrp = 0;
 611
 612                 if (!(flags & IORESOURCE_MEM))
 613                         continue;
 614                 if (asize < rsize)
 615                         continue;
 616                 rstart = of_translate_address(dp, addrp);
 617                 if (rstart == OF_BAD_ADDR)
 618                         continue;
 619                 if (addr_prop && (rstart <= addr_prop) &&
 620                     ((rstart + asize) >= (addr_prop + rsize)))
 621                         match_addrp = 1;
 622                 if (match_addrp) {
 623                         address = addr_prop;
 624                         break;
 625                 }
 626                 if (rsize > max_size) {
 627                         max_size = rsize;
 628                         address = OF_BAD_ADDR;
 629                 }
 630
 631                 if (address == OF_BAD_ADDR)
 632                         address = rstart;
 633         }
 634  skip_addr:
 635         if (address == OF_BAD_ADDR && addr_prop)
 636                 address = (u64)addr_prop;
 637         if (address != OF_BAD_ADDR) {
 638 #ifdef CONFIG_PCI
 639                 const __be32 *vidp, *didp;
 640                 u32 vid, did;
 641                 struct pci_dev *pdev;
 642
 643                 vidp = of_get_property(dp, "vendor-id", NULL);
 644                 didp = of_get_property(dp, "device-id", NULL);
 645                 if (vidp && didp) {
 646                         vid = be32_to_cpup(vidp);
 647                         did = be32_to_cpup(didp);
 648                         pdev = pci_get_device(vid, did, NULL);
 649                         if (!pdev || pci_enable_device(pdev))
 650                                 return;
 651                 }
 652 #endif
 653                 /* kludge for valkyrie */
 654                 if (of_node_name_eq(dp, "valkyrie"))
 655                         address += 0x1000;
 656                 offb_init_fb(parent, no_real_node ? "bootx" : NULL,
 657                              width, height, depth, pitch, address,
 658                              foreign_endian, no_real_node ? NULL : dp);
 659         }
 660 }
 661
 662 static int offb_remove(struct platform_device *pdev)
 663 {
 664         struct fb_info *info = platform_get_drvdata(pdev);
 665
 666         if (info)
 667                 unregister_framebuffer(info);
 668
 669         return 0;
 670 }
 671
 672 static int offb_probe_bootx_noscreen(struct platform_device *pdev)
 673 {
 674         offb_init_nodriver(pdev, of_chosen, 1);
 675
 676         return 0;
 677 }
 678
 679 static struct platform_driver offb_driver_bootx_noscreen = {
 680         .driver = {
 681                 .name = "bootx-noscreen",
 682         },
 683         .probe = offb_probe_bootx_noscreen,
 684         .remove = offb_remove,
 685 };
 686
 687 static int offb_probe_display(struct platform_device *pdev)
 688 {
 689         offb_init_nodriver(pdev, pdev->dev.of_node, 0);
 690
 691         return 0;
 692 }
 693
 694 static const struct of_device_id offb_of_match_display[] = {
 695         { .compatible = "display", },
 696         { },
 697 };
 698 MODULE_DEVICE_TABLE(of, offb_of_match_display);
 699
 700 static struct platform_driver offb_driver_display = {
 701         .driver = {
 702                 .name = "of-display",
 703                 .of_match_table = offb_of_match_display,
 704         },
 705         .probe = offb_probe_display,
 706         .remove = offb_remove,
 707 };
 708
 709 static int __init offb_init(void)
 710 {
 711         if (fb_get_options("offb", NULL))
 712                 return -ENODEV;
 713
 714         platform_driver_register(&offb_driver_bootx_noscreen);
 715         platform_driver_register(&offb_driver_display);
 716
 717         return 0;
 718 }
 719 module_init(offb_init);
 720
 721 static void __exit offb_exit(void)
 722 {
 723         platform_driver_unregister(&offb_driver_display);
 724         platform_driver_unregister(&offb_driver_bootx_noscreen);
 725 }
 726 module_exit(offb_exit);
 727
 728 MODULE_LICENSE("GPL");