1 /* 2 * linux/drivers/video/offb.c -- Open Firmware based frame buffer device 3 * 4 * Copyright (C) 1997 Geert Uytterhoeven 5 * 6 * This driver is partly based on the PowerMac console driver: 7 * 8 * Copyright (C) 1996 Paul Mackerras 9 * 10 * This file is subject to the terms and conditions of the GNU General Public 11 * License. See the file COPYING in the main directory of this archive for 12 * more details. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/kernel.h> 17 #include <linux/errno.h> 18 #include <linux/string.h> 19 #include <linux/mm.h> 20 #include <linux/vmalloc.h> 21 #include <linux/delay.h> 22 #include <linux/of.h> 23 #include <linux/of_address.h> 24 #include <linux/interrupt.h> 25 #include <linux/fb.h> 26 #include <linux/init.h> 27 #include <linux/ioport.h> 28 #include <linux/pci.h> 29 #include <asm/io.h> 30 31 #ifdef CONFIG_PPC64 32 #include <asm/pci-bridge.h> 33 #endif 34 35 #ifdef CONFIG_PPC32 36 #include <asm/bootx.h> 37 #endif 38 39 #include "macmodes.h" 40 41 /* Supported palette hacks */ 42 enum { 43 cmap_unknown, 44 cmap_simple, /* ATI Mach64 */ 45 cmap_r128, /* ATI Rage128 */ 46 cmap_M3A, /* ATI Rage Mobility M3 Head A */ 47 cmap_M3B, /* ATI Rage Mobility M3 Head B */ 48 cmap_radeon, /* ATI Radeon */ 49 cmap_gxt2000, /* IBM GXT2000 */ 50 cmap_avivo, /* ATI R5xx */ 51 cmap_qemu, /* qemu vga */ 52 }; 53 54 struct offb_par { 55 volatile void __iomem *cmap_adr; 56 volatile void __iomem *cmap_data; 57 int cmap_type; 58 int blanked; 59 }; 60 61 struct offb_par default_par; 62 63 #ifdef CONFIG_PPC32 64 extern boot_infos_t *boot_infos; 65 #endif 66 67 /* Definitions used by the Avivo palette hack */ 68 #define AVIVO_DC_LUT_RW_SELECT 0x6480 69 #define AVIVO_DC_LUT_RW_MODE 0x6484 70 #define AVIVO_DC_LUT_RW_INDEX 0x6488 71 #define AVIVO_DC_LUT_SEQ_COLOR 0x648c 72 #define AVIVO_DC_LUT_PWL_DATA 0x6490 73 #define AVIVO_DC_LUT_30_COLOR 0x6494 74 #define AVIVO_DC_LUT_READ_PIPE_SELECT 0x6498 75 #define AVIVO_DC_LUT_WRITE_EN_MASK 0x649c 76 #define AVIVO_DC_LUT_AUTOFILL 0x64a0 77 78 #define AVIVO_DC_LUTA_CONTROL 0x64c0 79 #define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE 0x64c4 80 #define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN 0x64c8 81 #define AVIVO_DC_LUTA_BLACK_OFFSET_RED 0x64cc 82 #define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE 0x64d0 83 #define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN 0x64d4 84 #define AVIVO_DC_LUTA_WHITE_OFFSET_RED 0x64d8 85 86 #define AVIVO_DC_LUTB_CONTROL 0x6cc0 87 #define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE 0x6cc4 88 #define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN 0x6cc8 89 #define AVIVO_DC_LUTB_BLACK_OFFSET_RED 0x6ccc 90 #define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE 0x6cd0 91 #define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN 0x6cd4 92 #define AVIVO_DC_LUTB_WHITE_OFFSET_RED 0x6cd8 93 94 /* 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 */ 99 100 static 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 */ 190 191 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 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 } 251 252 static 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 } 281 282 static 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 } 289 290 static 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 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 #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 __init offb_init_fb(const char *name, const char *full_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 "%s: can't use depth = %d\n", full_name, 410 depth); 411 release_mem_region(res_start, res_size); 412 return; 413 } 414 415 info = framebuffer_alloc(sizeof(u32) * 16, NULL); 416 417 if (info == 0) { 418 release_mem_region(res_start, res_size); 419 return; 420 } 421 422 fix = &info->fix; 423 var = &info->var; 424 info->par = par; 425 426 strcpy(fix->id, "OFfb "); 427 strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb ")); 428 fix->id[sizeof(fix->id) - 1] = '\0'; 429 430 var->xres = var->xres_virtual = width; 431 var->yres = var->yres_virtual = height; 432 fix->line_length = pitch; 433 434 fix->smem_start = address; 435 fix->smem_len = pitch * height; 436 fix->type = FB_TYPE_PACKED_PIXELS; 437 fix->type_aux = 0; 438 439 par->cmap_type = cmap_unknown; 440 if (depth == 8) 441 offb_init_palette_hacks(info, dp, name, address); 442 else 443 fix->visual = FB_VISUAL_TRUECOLOR; 444 445 var->xoffset = var->yoffset = 0; 446 switch (depth) { 447 case 8: 448 var->bits_per_pixel = 8; 449 var->red.offset = 0; 450 var->red.length = 8; 451 var->green.offset = 0; 452 var->green.length = 8; 453 var->blue.offset = 0; 454 var->blue.length = 8; 455 var->transp.offset = 0; 456 var->transp.length = 0; 457 break; 458 case 15: /* RGB 555 */ 459 var->bits_per_pixel = 16; 460 var->red.offset = 10; 461 var->red.length = 5; 462 var->green.offset = 5; 463 var->green.length = 5; 464 var->blue.offset = 0; 465 var->blue.length = 5; 466 var->transp.offset = 0; 467 var->transp.length = 0; 468 break; 469 case 16: /* RGB 565 */ 470 var->bits_per_pixel = 16; 471 var->red.offset = 11; 472 var->red.length = 5; 473 var->green.offset = 5; 474 var->green.length = 6; 475 var->blue.offset = 0; 476 var->blue.length = 5; 477 var->transp.offset = 0; 478 var->transp.length = 0; 479 break; 480 case 32: /* RGB 888 */ 481 var->bits_per_pixel = 32; 482 var->red.offset = 16; 483 var->red.length = 8; 484 var->green.offset = 8; 485 var->green.length = 8; 486 var->blue.offset = 0; 487 var->blue.length = 8; 488 var->transp.offset = 24; 489 var->transp.length = 8; 490 break; 491 } 492 var->red.msb_right = var->green.msb_right = var->blue.msb_right = 493 var->transp.msb_right = 0; 494 var->grayscale = 0; 495 var->nonstd = 0; 496 var->activate = 0; 497 var->height = var->width = -1; 498 var->pixclock = 10000; 499 var->left_margin = var->right_margin = 16; 500 var->upper_margin = var->lower_margin = 16; 501 var->hsync_len = var->vsync_len = 8; 502 var->sync = 0; 503 var->vmode = FB_VMODE_NONINTERLACED; 504 505 /* set offb aperture size for generic probing */ 506 info->apertures = alloc_apertures(1); 507 if (!info->apertures) 508 goto out_aper; 509 info->apertures->ranges[0].base = address; 510 info->apertures->ranges[0].size = fix->smem_len; 511 512 info->fbops = &offb_ops; 513 info->screen_base = ioremap(address, fix->smem_len); 514 info->pseudo_palette = (void *) (info + 1); 515 info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE | foreign_endian; 516 517 fb_alloc_cmap(&info->cmap, 256, 0); 518 519 if (register_framebuffer(info) < 0) 520 goto out_err; 521 522 fb_info(info, "Open Firmware frame buffer device on %s\n", full_name); 523 return; 524 525 out_err: 526 iounmap(info->screen_base); 527 out_aper: 528 iounmap(par->cmap_adr); 529 par->cmap_adr = NULL; 530 framebuffer_release(info); 531 release_mem_region(res_start, res_size); 532 } 533 534 535 static void __init offb_init_nodriver(struct device_node *dp, 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_get_property(dp, "little-endian", NULL)) 548 foreign_endian = FBINFO_FOREIGN_ENDIAN; 549 #else 550 if (of_get_property(dp, "big-endian", NULL)) 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 /* kludge for valkyrie */ 633 if (strcmp(dp->name, "valkyrie") == 0) 634 address += 0x1000; 635 offb_init_fb(no_real_node ? "bootx" : dp->name, 636 no_real_node ? "display" : dp->full_name, 637 width, height, depth, pitch, address, 638 foreign_endian, no_real_node ? NULL : dp); 639 } 640 } 641 642 static int __init offb_init(void) 643 { 644 struct device_node *dp = NULL, *boot_disp = NULL; 645 646 if (fb_get_options("offb", NULL)) 647 return -ENODEV; 648 649 /* Check if we have a MacOS display without a node spec */ 650 if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) { 651 /* The old code tried to work out which node was the MacOS 652 * display based on the address. I'm dropping that since the 653 * lack of a node spec only happens with old BootX versions 654 * (users can update) and with this code, they'll still get 655 * a display (just not the palette hacks). 656 */ 657 offb_init_nodriver(of_chosen, 1); 658 } 659 660 for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) { 661 if (of_get_property(dp, "linux,opened", NULL) && 662 of_get_property(dp, "linux,boot-display", NULL)) { 663 boot_disp = dp; 664 offb_init_nodriver(dp, 0); 665 } 666 } 667 for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) { 668 if (of_get_property(dp, "linux,opened", NULL) && 669 dp != boot_disp) 670 offb_init_nodriver(dp, 0); 671 } 672 673 return 0; 674 } 675 676 677 module_init(offb_init); 678 MODULE_LICENSE("GPL"); 679