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/aperture.h> 16 #include <linux/module.h> 17 #include <linux/kernel.h> 18 #include <linux/errno.h> 19 #include <linux/string.h> 20 #include <linux/mm.h> 21 #include <linux/vmalloc.h> 22 #include <linux/delay.h> 23 #include <linux/of.h> 24 #include <linux/of_address.h> 25 #include <linux/interrupt.h> 26 #include <linux/fb.h> 27 #include <linux/init.h> 28 #include <linux/ioport.h> 29 #include <linux/pci.h> 30 #include <linux/platform_device.h> 31 #include <asm/io.h> 32 33 #ifdef CONFIG_PPC32 34 #include <asm/bootx.h> 35 #endif 36 37 #include "macmodes.h" 38 39 /* Supported palette hacks */ 40 enum { 41 cmap_unknown, 42 cmap_simple, /* ATI Mach64 */ 43 cmap_r128, /* ATI Rage128 */ 44 cmap_M3A, /* ATI Rage Mobility M3 Head A */ 45 cmap_M3B, /* ATI Rage Mobility M3 Head B */ 46 cmap_radeon, /* ATI Radeon */ 47 cmap_gxt2000, /* IBM GXT2000 */ 48 cmap_avivo, /* ATI R5xx */ 49 cmap_qemu, /* qemu vga */ 50 }; 51 52 struct offb_par { 53 volatile void __iomem *cmap_adr; 54 volatile void __iomem *cmap_data; 55 int cmap_type; 56 int blanked; 57 u32 pseudo_palette[16]; 58 resource_size_t base; 59 resource_size_t size; 60 }; 61 62 #ifdef CONFIG_PPC32 63 extern boot_infos_t *boot_infos; 64 #endif 65 66 /* Definitions used by the Avivo palette hack */ 67 #define AVIVO_DC_LUT_RW_SELECT 0x6480 68 #define AVIVO_DC_LUT_RW_MODE 0x6484 69 #define AVIVO_DC_LUT_RW_INDEX 0x6488 70 #define AVIVO_DC_LUT_SEQ_COLOR 0x648c 71 #define AVIVO_DC_LUT_PWL_DATA 0x6490 72 #define AVIVO_DC_LUT_30_COLOR 0x6494 73 #define AVIVO_DC_LUT_READ_PIPE_SELECT 0x6498 74 #define AVIVO_DC_LUT_WRITE_EN_MASK 0x649c 75 #define AVIVO_DC_LUT_AUTOFILL 0x64a0 76 77 #define AVIVO_DC_LUTA_CONTROL 0x64c0 78 #define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE 0x64c4 79 #define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN 0x64c8 80 #define AVIVO_DC_LUTA_BLACK_OFFSET_RED 0x64cc 81 #define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE 0x64d0 82 #define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN 0x64d4 83 #define AVIVO_DC_LUTA_WHITE_OFFSET_RED 0x64d8 84 85 #define AVIVO_DC_LUTB_CONTROL 0x6cc0 86 #define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE 0x6cc4 87 #define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN 0x6cc8 88 #define AVIVO_DC_LUTB_BLACK_OFFSET_RED 0x6ccc 89 #define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE 0x6cd0 90 #define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN 0x6cd4 91 #define AVIVO_DC_LUTB_WHITE_OFFSET_RED 0x6cd8 92 93 /* 94 * Set a single color register. The values supplied are already 95 * rounded down to the hardware's capabilities (according to the 96 * entries in the var structure). Return != 0 for invalid regno. 97 */ 98 99 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 100 u_int transp, struct fb_info *info) 101 { 102 struct offb_par *par = (struct offb_par *) info->par; 103 104 if (info->fix.visual == FB_VISUAL_TRUECOLOR) { 105 u32 *pal = info->pseudo_palette; 106 u32 cr = red >> (16 - info->var.red.length); 107 u32 cg = green >> (16 - info->var.green.length); 108 u32 cb = blue >> (16 - info->var.blue.length); 109 u32 value; 110 111 if (regno >= 16) 112 return -EINVAL; 113 114 value = (cr << info->var.red.offset) | 115 (cg << info->var.green.offset) | 116 (cb << info->var.blue.offset); 117 if (info->var.transp.length > 0) { 118 u32 mask = (1 << info->var.transp.length) - 1; 119 mask <<= info->var.transp.offset; 120 value |= mask; 121 } 122 pal[regno] = value; 123 return 0; 124 } 125 126 if (regno > 255) 127 return -EINVAL; 128 129 red >>= 8; 130 green >>= 8; 131 blue >>= 8; 132 133 if (!par->cmap_adr) 134 return 0; 135 136 switch (par->cmap_type) { 137 case cmap_simple: 138 writeb(regno, par->cmap_adr); 139 writeb(red, par->cmap_data); 140 writeb(green, par->cmap_data); 141 writeb(blue, par->cmap_data); 142 break; 143 case cmap_M3A: 144 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */ 145 out_le32(par->cmap_adr + 0x58, 146 in_le32(par->cmap_adr + 0x58) & ~0x20); 147 fallthrough; 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 fallthrough; 218 case cmap_r128: 219 /* Set palette index & data */ 220 out_8(par->cmap_adr + 0xb0, i); 221 out_le32(par->cmap_adr + 0xb4, 0); 222 break; 223 case cmap_M3B: 224 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */ 225 out_le32(par->cmap_adr + 0x58, 226 in_le32(par->cmap_adr + 0x58) | 0x20); 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_radeon: 232 out_8(par->cmap_adr + 0xb0, i); 233 out_le32(par->cmap_adr + 0xb4, 0); 234 break; 235 case cmap_gxt2000: 236 out_le32(((unsigned __iomem *) par->cmap_adr) + i, 237 0); 238 break; 239 case cmap_avivo: 240 writel(1, 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 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT); 244 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX); 245 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR); 246 break; 247 } 248 } else 249 fb_set_cmap(&info->cmap, info); 250 return 0; 251 } 252 253 static int offb_set_par(struct fb_info *info) 254 { 255 struct offb_par *par = (struct offb_par *) info->par; 256 257 /* On avivo, initialize palette control */ 258 if (par->cmap_type == cmap_avivo) { 259 writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL); 260 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE); 261 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN); 262 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED); 263 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE); 264 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN); 265 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED); 266 writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL); 267 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE); 268 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN); 269 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED); 270 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE); 271 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN); 272 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED); 273 writel(1, 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 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT); 277 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE); 278 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK); 279 } 280 return 0; 281 } 282 283 static void offb_destroy(struct fb_info *info) 284 { 285 struct offb_par *par = info->par; 286 287 if (info->screen_base) 288 iounmap(info->screen_base); 289 release_mem_region(par->base, par->size); 290 fb_dealloc_cmap(&info->cmap); 291 framebuffer_release(info); 292 } 293 294 static const struct fb_ops offb_ops = { 295 .owner = THIS_MODULE, 296 FB_DEFAULT_IOMEM_OPS, 297 .fb_destroy = offb_destroy, 298 .fb_setcolreg = offb_setcolreg, 299 .fb_set_par = offb_set_par, 300 .fb_blank = offb_blank, 301 }; 302 303 static void __iomem *offb_map_reg(struct device_node *np, int index, 304 unsigned long offset, unsigned long size) 305 { 306 const __be32 *addrp; 307 u64 asize, taddr; 308 unsigned int flags; 309 310 addrp = of_get_pci_address(np, index, &asize, &flags); 311 if (addrp == NULL) 312 addrp = of_get_address(np, index, &asize, &flags); 313 if (addrp == NULL) 314 return NULL; 315 if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0) 316 return NULL; 317 if ((offset + size) > asize) 318 return NULL; 319 taddr = of_translate_address(np, addrp); 320 if (taddr == OF_BAD_ADDR) 321 return NULL; 322 return ioremap(taddr + offset, size); 323 } 324 325 static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp, 326 unsigned long address) 327 { 328 struct offb_par *par = (struct offb_par *) info->par; 329 330 if (of_node_name_prefix(dp, "ATY,Rage128")) { 331 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff); 332 if (par->cmap_adr) 333 par->cmap_type = cmap_r128; 334 } else if (of_node_name_prefix(dp, "ATY,RageM3pA") || 335 of_node_name_prefix(dp, "ATY,RageM3p12A")) { 336 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff); 337 if (par->cmap_adr) 338 par->cmap_type = cmap_M3A; 339 } else if (of_node_name_prefix(dp, "ATY,RageM3pB")) { 340 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff); 341 if (par->cmap_adr) 342 par->cmap_type = cmap_M3B; 343 } else if (of_node_name_prefix(dp, "ATY,Rage6")) { 344 par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff); 345 if (par->cmap_adr) 346 par->cmap_type = cmap_radeon; 347 } else if (of_node_name_prefix(dp, "ATY,")) { 348 unsigned long base = address & 0xff000000UL; 349 par->cmap_adr = 350 ioremap(base + 0x7ff000, 0x1000) + 0xcc0; 351 par->cmap_data = par->cmap_adr + 1; 352 par->cmap_type = cmap_simple; 353 } else if (dp && (of_device_is_compatible(dp, "pci1014,b7") || 354 of_device_is_compatible(dp, "pci1014,21c"))) { 355 par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000); 356 if (par->cmap_adr) 357 par->cmap_type = cmap_gxt2000; 358 } else if (of_node_name_prefix(dp, "vga,Display-")) { 359 /* Look for AVIVO initialized by SLOF */ 360 struct device_node *pciparent = of_get_parent(dp); 361 const u32 *vid, *did; 362 vid = of_get_property(pciparent, "vendor-id", NULL); 363 did = of_get_property(pciparent, "device-id", NULL); 364 /* This will match most R5xx */ 365 if (vid && did && *vid == 0x1002 && 366 ((*did >= 0x7100 && *did < 0x7800) || 367 (*did >= 0x9400))) { 368 par->cmap_adr = offb_map_reg(pciparent, 2, 0, 0x10000); 369 if (par->cmap_adr) 370 par->cmap_type = cmap_avivo; 371 } 372 of_node_put(pciparent); 373 } else if (dp && of_device_is_compatible(dp, "qemu,std-vga")) { 374 #ifdef __BIG_ENDIAN 375 const __be32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 }; 376 #else 377 const __be32 io_of_addr[3] = { 0x00000001, 0x0, 0x0 }; 378 #endif 379 u64 io_addr = of_translate_address(dp, io_of_addr); 380 if (io_addr != OF_BAD_ADDR) { 381 par->cmap_adr = ioremap(io_addr + 0x3c8, 2); 382 if (par->cmap_adr) { 383 par->cmap_type = cmap_simple; 384 par->cmap_data = par->cmap_adr + 1; 385 } 386 } 387 } 388 info->fix.visual = (par->cmap_type != cmap_unknown) ? 389 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR; 390 } 391 392 static void offb_init_fb(struct platform_device *parent, const char *name, 393 int width, int height, int depth, 394 int pitch, unsigned long address, 395 int foreign_endian, struct device_node *dp) 396 { 397 unsigned long res_size = pitch * height; 398 unsigned long res_start = address; 399 struct fb_fix_screeninfo *fix; 400 struct fb_var_screeninfo *var; 401 struct fb_info *info; 402 struct offb_par *par; 403 404 if (!request_mem_region(res_start, res_size, "offb")) 405 return; 406 407 printk(KERN_INFO 408 "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n", 409 width, height, name, address, depth, pitch); 410 if (depth != 8 && depth != 15 && depth != 16 && depth != 32) { 411 printk(KERN_ERR "%pOF: can't use depth = %d\n", dp, depth); 412 release_mem_region(res_start, res_size); 413 return; 414 } 415 416 info = framebuffer_alloc(sizeof(*par), &parent->dev); 417 if (!info) { 418 release_mem_region(res_start, res_size); 419 return; 420 } 421 platform_set_drvdata(parent, info); 422 par = info->par; 423 fix = &info->fix; 424 var = &info->var; 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 par->base = address; 510 par->size = fix->smem_len; 511 512 info->fbops = &offb_ops; 513 info->screen_base = ioremap(address, fix->smem_len); 514 info->pseudo_palette = par->pseudo_palette; 515 info->flags = foreign_endian; 516 517 fb_alloc_cmap(&info->cmap, 256, 0); 518 519 if (devm_aperture_acquire_for_platform_device(parent, par->base, par->size) < 0) 520 goto out_err; 521 if (register_framebuffer(info) < 0) 522 goto out_err; 523 524 fb_info(info, "Open Firmware frame buffer device on %pOF\n", dp); 525 return; 526 527 out_err: 528 fb_dealloc_cmap(&info->cmap); 529 iounmap(info->screen_base); 530 iounmap(par->cmap_adr); 531 par->cmap_adr = NULL; 532 framebuffer_release(info); 533 release_mem_region(res_start, res_size); 534 } 535 536 537 static void offb_init_nodriver(struct platform_device *parent, struct device_node *dp, 538 int no_real_node) 539 { 540 unsigned int len; 541 int i, width = 640, height = 480, depth = 8, pitch = 640; 542 unsigned int flags, rsize, addr_prop = 0; 543 unsigned long max_size = 0; 544 u64 rstart, address = OF_BAD_ADDR; 545 const __be32 *pp, *addrp, *up; 546 u64 asize; 547 int foreign_endian = 0; 548 549 #ifdef __BIG_ENDIAN 550 if (of_property_read_bool(dp, "little-endian")) 551 foreign_endian = FBINFO_FOREIGN_ENDIAN; 552 #else 553 if (of_property_read_bool(dp, "big-endian")) 554 foreign_endian = FBINFO_FOREIGN_ENDIAN; 555 #endif 556 557 pp = of_get_property(dp, "linux,bootx-depth", &len); 558 if (pp == NULL) 559 pp = of_get_property(dp, "depth", &len); 560 if (pp && len == sizeof(u32)) 561 depth = be32_to_cpup(pp); 562 563 pp = of_get_property(dp, "linux,bootx-width", &len); 564 if (pp == NULL) 565 pp = of_get_property(dp, "width", &len); 566 if (pp && len == sizeof(u32)) 567 width = be32_to_cpup(pp); 568 569 pp = of_get_property(dp, "linux,bootx-height", &len); 570 if (pp == NULL) 571 pp = of_get_property(dp, "height", &len); 572 if (pp && len == sizeof(u32)) 573 height = be32_to_cpup(pp); 574 575 pp = of_get_property(dp, "linux,bootx-linebytes", &len); 576 if (pp == NULL) 577 pp = of_get_property(dp, "linebytes", &len); 578 if (pp && len == sizeof(u32) && (*pp != 0xffffffffu)) 579 pitch = be32_to_cpup(pp); 580 else 581 pitch = width * ((depth + 7) / 8); 582 583 rsize = (unsigned long)pitch * (unsigned long)height; 584 585 /* Ok, now we try to figure out the address of the framebuffer. 586 * 587 * Unfortunately, Open Firmware doesn't provide a standard way to do 588 * so. All we can do is a dodgy heuristic that happens to work in 589 * practice. On most machines, the "address" property contains what 590 * we need, though not on Matrox cards found in IBM machines. What I've 591 * found that appears to give good results is to go through the PCI 592 * ranges and pick one that is both big enough and if possible encloses 593 * the "address" property. If none match, we pick the biggest 594 */ 595 up = of_get_property(dp, "linux,bootx-addr", &len); 596 if (up == NULL) 597 up = of_get_property(dp, "address", &len); 598 if (up && len == sizeof(u32)) 599 addr_prop = *up; 600 601 /* Hack for when BootX is passing us */ 602 if (no_real_node) 603 goto skip_addr; 604 605 for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags)) 606 != NULL; i++) { 607 int match_addrp = 0; 608 609 if (!(flags & IORESOURCE_MEM)) 610 continue; 611 if (asize < rsize) 612 continue; 613 rstart = of_translate_address(dp, addrp); 614 if (rstart == OF_BAD_ADDR) 615 continue; 616 if (addr_prop && (rstart <= addr_prop) && 617 ((rstart + asize) >= (addr_prop + rsize))) 618 match_addrp = 1; 619 if (match_addrp) { 620 address = addr_prop; 621 break; 622 } 623 if (rsize > max_size) { 624 max_size = rsize; 625 address = OF_BAD_ADDR; 626 } 627 628 if (address == OF_BAD_ADDR) 629 address = rstart; 630 } 631 skip_addr: 632 if (address == OF_BAD_ADDR && addr_prop) 633 address = (u64)addr_prop; 634 if (address != OF_BAD_ADDR) { 635 #ifdef CONFIG_PCI 636 const __be32 *vidp, *didp; 637 u32 vid, did; 638 struct pci_dev *pdev; 639 640 vidp = of_get_property(dp, "vendor-id", NULL); 641 didp = of_get_property(dp, "device-id", NULL); 642 if (vidp && didp) { 643 vid = be32_to_cpup(vidp); 644 did = be32_to_cpup(didp); 645 pdev = pci_get_device(vid, did, NULL); 646 if (!pdev || pci_enable_device(pdev)) 647 return; 648 } 649 #endif 650 /* kludge for valkyrie */ 651 if (of_node_name_eq(dp, "valkyrie")) 652 address += 0x1000; 653 offb_init_fb(parent, no_real_node ? "bootx" : NULL, 654 width, height, depth, pitch, address, 655 foreign_endian, no_real_node ? NULL : dp); 656 } 657 } 658 659 static void offb_remove(struct platform_device *pdev) 660 { 661 struct fb_info *info = platform_get_drvdata(pdev); 662 663 if (info) 664 unregister_framebuffer(info); 665 } 666 667 static int offb_probe_bootx_noscreen(struct platform_device *pdev) 668 { 669 offb_init_nodriver(pdev, of_chosen, 1); 670 671 return 0; 672 } 673 674 static struct platform_driver offb_driver_bootx_noscreen = { 675 .driver = { 676 .name = "bootx-noscreen", 677 }, 678 .probe = offb_probe_bootx_noscreen, 679 .remove_new = offb_remove, 680 }; 681 682 static int offb_probe_display(struct platform_device *pdev) 683 { 684 offb_init_nodriver(pdev, pdev->dev.of_node, 0); 685 686 return 0; 687 } 688 689 static const struct of_device_id offb_of_match_display[] = { 690 { .compatible = "display", }, 691 { }, 692 }; 693 MODULE_DEVICE_TABLE(of, offb_of_match_display); 694 695 static struct platform_driver offb_driver_display = { 696 .driver = { 697 .name = "of-display", 698 .of_match_table = offb_of_match_display, 699 }, 700 .probe = offb_probe_display, 701 .remove_new = offb_remove, 702 }; 703 704 static int __init offb_init(void) 705 { 706 if (fb_get_options("offb", NULL)) 707 return -ENODEV; 708 709 platform_driver_register(&offb_driver_bootx_noscreen); 710 platform_driver_register(&offb_driver_display); 711 712 return 0; 713 } 714 module_init(offb_init); 715 716 static void __exit offb_exit(void) 717 { 718 platform_driver_unregister(&offb_driver_display); 719 platform_driver_unregister(&offb_driver_bootx_noscreen); 720 } 721 module_exit(offb_exit); 722 723 MODULE_LICENSE("GPL"); 724