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 #define FB_RIGHT_POS(p, bpp) (fb_be_math(p) ? 0 : (32 - (bpp))) 95 96 static inline u32 offb_cmap_byteswap(struct fb_info *info, u32 value) 97 { 98 u32 bpp = info->var.bits_per_pixel; 99 100 return cpu_to_be32(value) >> FB_RIGHT_POS(info, bpp); 101 } 102 103 /* 104 * Set a single color register. The values supplied are already 105 * rounded down to the hardware's capabilities (according to the 106 * entries in the var structure). Return != 0 for invalid regno. 107 */ 108 109 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 110 u_int transp, struct fb_info *info) 111 { 112 struct offb_par *par = (struct offb_par *) info->par; 113 114 if (info->fix.visual == FB_VISUAL_TRUECOLOR) { 115 u32 *pal = info->pseudo_palette; 116 u32 cr = red >> (16 - info->var.red.length); 117 u32 cg = green >> (16 - info->var.green.length); 118 u32 cb = blue >> (16 - info->var.blue.length); 119 u32 value; 120 121 if (regno >= 16) 122 return -EINVAL; 123 124 value = (cr << info->var.red.offset) | 125 (cg << info->var.green.offset) | 126 (cb << info->var.blue.offset); 127 if (info->var.transp.length > 0) { 128 u32 mask = (1 << info->var.transp.length) - 1; 129 mask <<= info->var.transp.offset; 130 value |= mask; 131 } 132 pal[regno] = offb_cmap_byteswap(info, value); 133 return 0; 134 } 135 136 if (regno > 255) 137 return -EINVAL; 138 139 red >>= 8; 140 green >>= 8; 141 blue >>= 8; 142 143 if (!par->cmap_adr) 144 return 0; 145 146 switch (par->cmap_type) { 147 case cmap_simple: 148 writeb(regno, par->cmap_adr); 149 writeb(red, par->cmap_data); 150 writeb(green, par->cmap_data); 151 writeb(blue, par->cmap_data); 152 break; 153 case cmap_M3A: 154 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */ 155 out_le32(par->cmap_adr + 0x58, 156 in_le32(par->cmap_adr + 0x58) & ~0x20); 157 case cmap_r128: 158 /* Set palette index & data */ 159 out_8(par->cmap_adr + 0xb0, regno); 160 out_le32(par->cmap_adr + 0xb4, 161 (red << 16 | green << 8 | blue)); 162 break; 163 case cmap_M3B: 164 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */ 165 out_le32(par->cmap_adr + 0x58, 166 in_le32(par->cmap_adr + 0x58) | 0x20); 167 /* Set palette index & data */ 168 out_8(par->cmap_adr + 0xb0, regno); 169 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue)); 170 break; 171 case cmap_radeon: 172 /* Set palette index & data (could be smarter) */ 173 out_8(par->cmap_adr + 0xb0, regno); 174 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue)); 175 break; 176 case cmap_gxt2000: 177 out_le32(((unsigned __iomem *) par->cmap_adr) + regno, 178 (red << 16 | green << 8 | blue)); 179 break; 180 case cmap_avivo: 181 /* Write to both LUTs for now */ 182 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT); 183 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX); 184 writel(((red) << 22) | ((green) << 12) | ((blue) << 2), 185 par->cmap_adr + AVIVO_DC_LUT_30_COLOR); 186 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT); 187 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX); 188 writel(((red) << 22) | ((green) << 12) | ((blue) << 2), 189 par->cmap_adr + AVIVO_DC_LUT_30_COLOR); 190 break; 191 } 192 193 return 0; 194 } 195 196 /* 197 * Blank the display. 198 */ 199 200 static int offb_blank(int blank, struct fb_info *info) 201 { 202 struct offb_par *par = (struct offb_par *) info->par; 203 int i, j; 204 205 if (!par->cmap_adr) 206 return 0; 207 208 if (!par->blanked) 209 if (!blank) 210 return 0; 211 212 par->blanked = blank; 213 214 if (blank) 215 for (i = 0; i < 256; i++) { 216 switch (par->cmap_type) { 217 case cmap_simple: 218 writeb(i, par->cmap_adr); 219 for (j = 0; j < 3; j++) 220 writeb(0, par->cmap_data); 221 break; 222 case cmap_M3A: 223 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */ 224 out_le32(par->cmap_adr + 0x58, 225 in_le32(par->cmap_adr + 0x58) & ~0x20); 226 case cmap_r128: 227 /* Set palette index & data */ 228 out_8(par->cmap_adr + 0xb0, i); 229 out_le32(par->cmap_adr + 0xb4, 0); 230 break; 231 case cmap_M3B: 232 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */ 233 out_le32(par->cmap_adr + 0x58, 234 in_le32(par->cmap_adr + 0x58) | 0x20); 235 /* Set palette index & data */ 236 out_8(par->cmap_adr + 0xb0, i); 237 out_le32(par->cmap_adr + 0xb4, 0); 238 break; 239 case cmap_radeon: 240 out_8(par->cmap_adr + 0xb0, i); 241 out_le32(par->cmap_adr + 0xb4, 0); 242 break; 243 case cmap_gxt2000: 244 out_le32(((unsigned __iomem *) par->cmap_adr) + i, 245 0); 246 break; 247 case cmap_avivo: 248 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT); 249 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX); 250 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR); 251 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT); 252 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX); 253 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR); 254 break; 255 } 256 } else 257 fb_set_cmap(&info->cmap, info); 258 return 0; 259 } 260 261 static int offb_set_par(struct fb_info *info) 262 { 263 struct offb_par *par = (struct offb_par *) info->par; 264 265 /* On avivo, initialize palette control */ 266 if (par->cmap_type == cmap_avivo) { 267 writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL); 268 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE); 269 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN); 270 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED); 271 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE); 272 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN); 273 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED); 274 writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL); 275 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE); 276 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN); 277 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED); 278 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE); 279 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN); 280 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED); 281 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT); 282 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE); 283 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK); 284 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT); 285 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE); 286 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK); 287 } 288 return 0; 289 } 290 291 static void offb_destroy(struct fb_info *info) 292 { 293 if (info->screen_base) 294 iounmap(info->screen_base); 295 release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size); 296 framebuffer_release(info); 297 } 298 299 static struct fb_ops offb_ops = { 300 .owner = THIS_MODULE, 301 .fb_destroy = offb_destroy, 302 .fb_setcolreg = offb_setcolreg, 303 .fb_set_par = offb_set_par, 304 .fb_blank = offb_blank, 305 .fb_fillrect = cfb_fillrect, 306 .fb_copyarea = cfb_copyarea, 307 .fb_imageblit = cfb_imageblit, 308 }; 309 310 static void __iomem *offb_map_reg(struct device_node *np, int index, 311 unsigned long offset, unsigned long size) 312 { 313 const __be32 *addrp; 314 u64 asize, taddr; 315 unsigned int flags; 316 317 addrp = of_get_pci_address(np, index, &asize, &flags); 318 if (addrp == NULL) 319 addrp = of_get_address(np, index, &asize, &flags); 320 if (addrp == NULL) 321 return NULL; 322 if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0) 323 return NULL; 324 if ((offset + size) > asize) 325 return NULL; 326 taddr = of_translate_address(np, addrp); 327 if (taddr == OF_BAD_ADDR) 328 return NULL; 329 return ioremap(taddr + offset, size); 330 } 331 332 static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp, 333 const char *name, unsigned long address) 334 { 335 struct offb_par *par = (struct offb_par *) info->par; 336 337 if (dp && !strncmp(name, "ATY,Rage128", 11)) { 338 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff); 339 if (par->cmap_adr) 340 par->cmap_type = cmap_r128; 341 } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12) 342 || !strncmp(name, "ATY,RageM3p12A", 14))) { 343 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff); 344 if (par->cmap_adr) 345 par->cmap_type = cmap_M3A; 346 } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) { 347 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff); 348 if (par->cmap_adr) 349 par->cmap_type = cmap_M3B; 350 } else if (dp && !strncmp(name, "ATY,Rage6", 9)) { 351 par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff); 352 if (par->cmap_adr) 353 par->cmap_type = cmap_radeon; 354 } else if (!strncmp(name, "ATY,", 4)) { 355 unsigned long base = address & 0xff000000UL; 356 par->cmap_adr = 357 ioremap(base + 0x7ff000, 0x1000) + 0xcc0; 358 par->cmap_data = par->cmap_adr + 1; 359 par->cmap_type = cmap_simple; 360 } else if (dp && (of_device_is_compatible(dp, "pci1014,b7") || 361 of_device_is_compatible(dp, "pci1014,21c"))) { 362 par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000); 363 if (par->cmap_adr) 364 par->cmap_type = cmap_gxt2000; 365 } else if (dp && !strncmp(name, "vga,Display-", 12)) { 366 /* Look for AVIVO initialized by SLOF */ 367 struct device_node *pciparent = of_get_parent(dp); 368 const u32 *vid, *did; 369 vid = of_get_property(pciparent, "vendor-id", NULL); 370 did = of_get_property(pciparent, "device-id", NULL); 371 /* This will match most R5xx */ 372 if (vid && did && *vid == 0x1002 && 373 ((*did >= 0x7100 && *did < 0x7800) || 374 (*did >= 0x9400))) { 375 par->cmap_adr = offb_map_reg(pciparent, 2, 0, 0x10000); 376 if (par->cmap_adr) 377 par->cmap_type = cmap_avivo; 378 } 379 of_node_put(pciparent); 380 } else if (dp && of_device_is_compatible(dp, "qemu,std-vga")) { 381 #ifdef __BIG_ENDIAN 382 const __be32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 }; 383 #else 384 const __be32 io_of_addr[3] = { 0x00000001, 0x0, 0x0 }; 385 #endif 386 u64 io_addr = of_translate_address(dp, io_of_addr); 387 if (io_addr != OF_BAD_ADDR) { 388 par->cmap_adr = ioremap(io_addr + 0x3c8, 2); 389 if (par->cmap_adr) { 390 par->cmap_type = cmap_simple; 391 par->cmap_data = par->cmap_adr + 1; 392 } 393 } 394 } 395 info->fix.visual = (par->cmap_type != cmap_unknown) ? 396 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR; 397 } 398 399 static void __init offb_init_fb(const char *name, const char *full_name, 400 int width, int height, int depth, 401 int pitch, unsigned long address, 402 int foreign_endian, struct device_node *dp) 403 { 404 unsigned long res_size = pitch * height; 405 struct offb_par *par = &default_par; 406 unsigned long res_start = address; 407 struct fb_fix_screeninfo *fix; 408 struct fb_var_screeninfo *var; 409 struct fb_info *info; 410 411 if (!request_mem_region(res_start, res_size, "offb")) 412 return; 413 414 printk(KERN_INFO 415 "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n", 416 width, height, name, address, depth, pitch); 417 if (depth != 8 && depth != 15 && depth != 16 && depth != 32) { 418 printk(KERN_ERR "%s: can't use depth = %d\n", full_name, 419 depth); 420 release_mem_region(res_start, res_size); 421 return; 422 } 423 424 info = framebuffer_alloc(sizeof(u32) * 16, NULL); 425 426 if (info == 0) { 427 release_mem_region(res_start, res_size); 428 return; 429 } 430 431 fix = &info->fix; 432 var = &info->var; 433 info->par = par; 434 435 strcpy(fix->id, "OFfb "); 436 strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb ")); 437 fix->id[sizeof(fix->id) - 1] = '\0'; 438 439 var->xres = var->xres_virtual = width; 440 var->yres = var->yres_virtual = height; 441 fix->line_length = pitch; 442 443 fix->smem_start = address; 444 fix->smem_len = pitch * height; 445 fix->type = FB_TYPE_PACKED_PIXELS; 446 fix->type_aux = 0; 447 448 par->cmap_type = cmap_unknown; 449 if (depth == 8) 450 offb_init_palette_hacks(info, dp, name, address); 451 else 452 fix->visual = FB_VISUAL_TRUECOLOR; 453 454 var->xoffset = var->yoffset = 0; 455 switch (depth) { 456 case 8: 457 var->bits_per_pixel = 8; 458 var->red.offset = 0; 459 var->red.length = 8; 460 var->green.offset = 0; 461 var->green.length = 8; 462 var->blue.offset = 0; 463 var->blue.length = 8; 464 var->transp.offset = 0; 465 var->transp.length = 0; 466 break; 467 case 15: /* RGB 555 */ 468 var->bits_per_pixel = 16; 469 var->red.offset = 10; 470 var->red.length = 5; 471 var->green.offset = 5; 472 var->green.length = 5; 473 var->blue.offset = 0; 474 var->blue.length = 5; 475 var->transp.offset = 0; 476 var->transp.length = 0; 477 break; 478 case 16: /* RGB 565 */ 479 var->bits_per_pixel = 16; 480 var->red.offset = 11; 481 var->red.length = 5; 482 var->green.offset = 5; 483 var->green.length = 6; 484 var->blue.offset = 0; 485 var->blue.length = 5; 486 var->transp.offset = 0; 487 var->transp.length = 0; 488 break; 489 case 32: /* RGB 888 */ 490 var->bits_per_pixel = 32; 491 var->red.offset = 16; 492 var->red.length = 8; 493 var->green.offset = 8; 494 var->green.length = 8; 495 var->blue.offset = 0; 496 var->blue.length = 8; 497 var->transp.offset = 24; 498 var->transp.length = 8; 499 break; 500 } 501 var->red.msb_right = var->green.msb_right = var->blue.msb_right = 502 var->transp.msb_right = 0; 503 var->grayscale = 0; 504 var->nonstd = 0; 505 var->activate = 0; 506 var->height = var->width = -1; 507 var->pixclock = 10000; 508 var->left_margin = var->right_margin = 16; 509 var->upper_margin = var->lower_margin = 16; 510 var->hsync_len = var->vsync_len = 8; 511 var->sync = 0; 512 var->vmode = FB_VMODE_NONINTERLACED; 513 514 /* set offb aperture size for generic probing */ 515 info->apertures = alloc_apertures(1); 516 if (!info->apertures) 517 goto out_aper; 518 info->apertures->ranges[0].base = address; 519 info->apertures->ranges[0].size = fix->smem_len; 520 521 info->fbops = &offb_ops; 522 info->screen_base = ioremap(address, fix->smem_len); 523 info->pseudo_palette = (void *) (info + 1); 524 info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE | foreign_endian; 525 526 fb_alloc_cmap(&info->cmap, 256, 0); 527 528 if (register_framebuffer(info) < 0) 529 goto out_err; 530 531 fb_info(info, "Open Firmware frame buffer device on %s\n", full_name); 532 return; 533 534 out_err: 535 iounmap(info->screen_base); 536 out_aper: 537 iounmap(par->cmap_adr); 538 par->cmap_adr = NULL; 539 framebuffer_release(info); 540 release_mem_region(res_start, res_size); 541 } 542 543 544 static void __init offb_init_nodriver(struct device_node *dp, int no_real_node) 545 { 546 unsigned int len; 547 int i, width = 640, height = 480, depth = 8, pitch = 640; 548 unsigned int flags, rsize, addr_prop = 0; 549 unsigned long max_size = 0; 550 u64 rstart, address = OF_BAD_ADDR; 551 const __be32 *pp, *addrp, *up; 552 u64 asize; 553 int foreign_endian = 0; 554 555 #ifdef __BIG_ENDIAN 556 if (of_get_property(dp, "little-endian", NULL)) 557 foreign_endian = FBINFO_FOREIGN_ENDIAN; 558 #else 559 if (of_get_property(dp, "big-endian", NULL)) 560 foreign_endian = FBINFO_FOREIGN_ENDIAN; 561 #endif 562 563 pp = of_get_property(dp, "linux,bootx-depth", &len); 564 if (pp == NULL) 565 pp = of_get_property(dp, "depth", &len); 566 if (pp && len == sizeof(u32)) 567 depth = be32_to_cpup(pp); 568 569 pp = of_get_property(dp, "linux,bootx-width", &len); 570 if (pp == NULL) 571 pp = of_get_property(dp, "width", &len); 572 if (pp && len == sizeof(u32)) 573 width = be32_to_cpup(pp); 574 575 pp = of_get_property(dp, "linux,bootx-height", &len); 576 if (pp == NULL) 577 pp = of_get_property(dp, "height", &len); 578 if (pp && len == sizeof(u32)) 579 height = be32_to_cpup(pp); 580 581 pp = of_get_property(dp, "linux,bootx-linebytes", &len); 582 if (pp == NULL) 583 pp = of_get_property(dp, "linebytes", &len); 584 if (pp && len == sizeof(u32) && (*pp != 0xffffffffu)) 585 pitch = be32_to_cpup(pp); 586 else 587 pitch = width * ((depth + 7) / 8); 588 589 rsize = (unsigned long)pitch * (unsigned long)height; 590 591 /* Ok, now we try to figure out the address of the framebuffer. 592 * 593 * Unfortunately, Open Firmware doesn't provide a standard way to do 594 * so. All we can do is a dodgy heuristic that happens to work in 595 * practice. On most machines, the "address" property contains what 596 * we need, though not on Matrox cards found in IBM machines. What I've 597 * found that appears to give good results is to go through the PCI 598 * ranges and pick one that is both big enough and if possible encloses 599 * the "address" property. If none match, we pick the biggest 600 */ 601 up = of_get_property(dp, "linux,bootx-addr", &len); 602 if (up == NULL) 603 up = of_get_property(dp, "address", &len); 604 if (up && len == sizeof(u32)) 605 addr_prop = *up; 606 607 /* Hack for when BootX is passing us */ 608 if (no_real_node) 609 goto skip_addr; 610 611 for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags)) 612 != NULL; i++) { 613 int match_addrp = 0; 614 615 if (!(flags & IORESOURCE_MEM)) 616 continue; 617 if (asize < rsize) 618 continue; 619 rstart = of_translate_address(dp, addrp); 620 if (rstart == OF_BAD_ADDR) 621 continue; 622 if (addr_prop && (rstart <= addr_prop) && 623 ((rstart + asize) >= (addr_prop + rsize))) 624 match_addrp = 1; 625 if (match_addrp) { 626 address = addr_prop; 627 break; 628 } 629 if (rsize > max_size) { 630 max_size = rsize; 631 address = OF_BAD_ADDR; 632 } 633 634 if (address == OF_BAD_ADDR) 635 address = rstart; 636 } 637 skip_addr: 638 if (address == OF_BAD_ADDR && addr_prop) 639 address = (u64)addr_prop; 640 if (address != OF_BAD_ADDR) { 641 /* kludge for valkyrie */ 642 if (strcmp(dp->name, "valkyrie") == 0) 643 address += 0x1000; 644 offb_init_fb(no_real_node ? "bootx" : dp->name, 645 no_real_node ? "display" : dp->full_name, 646 width, height, depth, pitch, address, 647 foreign_endian, no_real_node ? NULL : dp); 648 } 649 } 650 651 static int __init offb_init(void) 652 { 653 struct device_node *dp = NULL, *boot_disp = NULL; 654 655 if (fb_get_options("offb", NULL)) 656 return -ENODEV; 657 658 /* Check if we have a MacOS display without a node spec */ 659 if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) { 660 /* The old code tried to work out which node was the MacOS 661 * display based on the address. I'm dropping that since the 662 * lack of a node spec only happens with old BootX versions 663 * (users can update) and with this code, they'll still get 664 * a display (just not the palette hacks). 665 */ 666 offb_init_nodriver(of_chosen, 1); 667 } 668 669 for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) { 670 if (of_get_property(dp, "linux,opened", NULL) && 671 of_get_property(dp, "linux,boot-display", NULL)) { 672 boot_disp = dp; 673 offb_init_nodriver(dp, 0); 674 } 675 } 676 for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) { 677 if (of_get_property(dp, "linux,opened", NULL) && 678 dp != boot_disp) 679 offb_init_nodriver(dp, 0); 680 } 681 682 return 0; 683 } 684 685 686 module_init(offb_init); 687 MODULE_LICENSE("GPL"); 688