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_destroy = offb_destroy, 297 .fb_setcolreg = offb_setcolreg, 298 .fb_set_par = offb_set_par, 299 .fb_blank = offb_blank, 300 .fb_fillrect = cfb_fillrect, 301 .fb_copyarea = cfb_copyarea, 302 .fb_imageblit = cfb_imageblit, 303 }; 304 305 static void __iomem *offb_map_reg(struct device_node *np, int index, 306 unsigned long offset, unsigned long size) 307 { 308 const __be32 *addrp; 309 u64 asize, taddr; 310 unsigned int flags; 311 312 addrp = of_get_pci_address(np, index, &asize, &flags); 313 if (addrp == NULL) 314 addrp = of_get_address(np, index, &asize, &flags); 315 if (addrp == NULL) 316 return NULL; 317 if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0) 318 return NULL; 319 if ((offset + size) > asize) 320 return NULL; 321 taddr = of_translate_address(np, addrp); 322 if (taddr == OF_BAD_ADDR) 323 return NULL; 324 return ioremap(taddr + offset, size); 325 } 326 327 static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp, 328 unsigned long address) 329 { 330 struct offb_par *par = (struct offb_par *) info->par; 331 332 if (of_node_name_prefix(dp, "ATY,Rage128")) { 333 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff); 334 if (par->cmap_adr) 335 par->cmap_type = cmap_r128; 336 } else if (of_node_name_prefix(dp, "ATY,RageM3pA") || 337 of_node_name_prefix(dp, "ATY,RageM3p12A")) { 338 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff); 339 if (par->cmap_adr) 340 par->cmap_type = cmap_M3A; 341 } else if (of_node_name_prefix(dp, "ATY,RageM3pB")) { 342 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff); 343 if (par->cmap_adr) 344 par->cmap_type = cmap_M3B; 345 } else if (of_node_name_prefix(dp, "ATY,Rage6")) { 346 par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff); 347 if (par->cmap_adr) 348 par->cmap_type = cmap_radeon; 349 } else if (of_node_name_prefix(dp, "ATY,")) { 350 unsigned long base = address & 0xff000000UL; 351 par->cmap_adr = 352 ioremap(base + 0x7ff000, 0x1000) + 0xcc0; 353 par->cmap_data = par->cmap_adr + 1; 354 par->cmap_type = cmap_simple; 355 } else if (dp && (of_device_is_compatible(dp, "pci1014,b7") || 356 of_device_is_compatible(dp, "pci1014,21c"))) { 357 par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000); 358 if (par->cmap_adr) 359 par->cmap_type = cmap_gxt2000; 360 } else if (of_node_name_prefix(dp, "vga,Display-")) { 361 /* Look for AVIVO initialized by SLOF */ 362 struct device_node *pciparent = of_get_parent(dp); 363 const u32 *vid, *did; 364 vid = of_get_property(pciparent, "vendor-id", NULL); 365 did = of_get_property(pciparent, "device-id", NULL); 366 /* This will match most R5xx */ 367 if (vid && did && *vid == 0x1002 && 368 ((*did >= 0x7100 && *did < 0x7800) || 369 (*did >= 0x9400))) { 370 par->cmap_adr = offb_map_reg(pciparent, 2, 0, 0x10000); 371 if (par->cmap_adr) 372 par->cmap_type = cmap_avivo; 373 } 374 of_node_put(pciparent); 375 } else if (dp && of_device_is_compatible(dp, "qemu,std-vga")) { 376 #ifdef __BIG_ENDIAN 377 const __be32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 }; 378 #else 379 const __be32 io_of_addr[3] = { 0x00000001, 0x0, 0x0 }; 380 #endif 381 u64 io_addr = of_translate_address(dp, io_of_addr); 382 if (io_addr != OF_BAD_ADDR) { 383 par->cmap_adr = ioremap(io_addr + 0x3c8, 2); 384 if (par->cmap_adr) { 385 par->cmap_type = cmap_simple; 386 par->cmap_data = par->cmap_adr + 1; 387 } 388 } 389 } 390 info->fix.visual = (par->cmap_type != cmap_unknown) ? 391 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR; 392 } 393 394 static void offb_init_fb(struct platform_device *parent, const char *name, 395 int width, int height, int depth, 396 int pitch, unsigned long address, 397 int foreign_endian, struct device_node *dp) 398 { 399 unsigned long res_size = pitch * height; 400 unsigned long res_start = address; 401 struct fb_fix_screeninfo *fix; 402 struct fb_var_screeninfo *var; 403 struct fb_info *info; 404 struct offb_par *par; 405 406 if (!request_mem_region(res_start, res_size, "offb")) 407 return; 408 409 printk(KERN_INFO 410 "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n", 411 width, height, name, address, depth, pitch); 412 if (depth != 8 && depth != 15 && depth != 16 && depth != 32) { 413 printk(KERN_ERR "%pOF: can't use depth = %d\n", dp, depth); 414 release_mem_region(res_start, res_size); 415 return; 416 } 417 418 info = framebuffer_alloc(sizeof(*par), &parent->dev); 419 if (!info) { 420 release_mem_region(res_start, res_size); 421 return; 422 } 423 platform_set_drvdata(parent, info); 424 par = info->par; 425 fix = &info->fix; 426 var = &info->var; 427 428 if (name) { 429 strcpy(fix->id, "OFfb "); 430 strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb ")); 431 fix->id[sizeof(fix->id) - 1] = '\0'; 432 } else 433 snprintf(fix->id, sizeof(fix->id), "OFfb %pOFn", dp); 434 435 436 var->xres = var->xres_virtual = width; 437 var->yres = var->yres_virtual = height; 438 fix->line_length = pitch; 439 440 fix->smem_start = address; 441 fix->smem_len = pitch * height; 442 fix->type = FB_TYPE_PACKED_PIXELS; 443 fix->type_aux = 0; 444 445 par->cmap_type = cmap_unknown; 446 if (depth == 8) 447 offb_init_palette_hacks(info, dp, address); 448 else 449 fix->visual = FB_VISUAL_TRUECOLOR; 450 451 var->xoffset = var->yoffset = 0; 452 switch (depth) { 453 case 8: 454 var->bits_per_pixel = 8; 455 var->red.offset = 0; 456 var->red.length = 8; 457 var->green.offset = 0; 458 var->green.length = 8; 459 var->blue.offset = 0; 460 var->blue.length = 8; 461 var->transp.offset = 0; 462 var->transp.length = 0; 463 break; 464 case 15: /* RGB 555 */ 465 var->bits_per_pixel = 16; 466 var->red.offset = 10; 467 var->red.length = 5; 468 var->green.offset = 5; 469 var->green.length = 5; 470 var->blue.offset = 0; 471 var->blue.length = 5; 472 var->transp.offset = 0; 473 var->transp.length = 0; 474 break; 475 case 16: /* RGB 565 */ 476 var->bits_per_pixel = 16; 477 var->red.offset = 11; 478 var->red.length = 5; 479 var->green.offset = 5; 480 var->green.length = 6; 481 var->blue.offset = 0; 482 var->blue.length = 5; 483 var->transp.offset = 0; 484 var->transp.length = 0; 485 break; 486 case 32: /* RGB 888 */ 487 var->bits_per_pixel = 32; 488 var->red.offset = 16; 489 var->red.length = 8; 490 var->green.offset = 8; 491 var->green.length = 8; 492 var->blue.offset = 0; 493 var->blue.length = 8; 494 var->transp.offset = 24; 495 var->transp.length = 8; 496 break; 497 } 498 var->red.msb_right = var->green.msb_right = var->blue.msb_right = 499 var->transp.msb_right = 0; 500 var->grayscale = 0; 501 var->nonstd = 0; 502 var->activate = 0; 503 var->height = var->width = -1; 504 var->pixclock = 10000; 505 var->left_margin = var->right_margin = 16; 506 var->upper_margin = var->lower_margin = 16; 507 var->hsync_len = var->vsync_len = 8; 508 var->sync = 0; 509 var->vmode = FB_VMODE_NONINTERLACED; 510 511 par->base = address; 512 par->size = fix->smem_len; 513 514 info->fbops = &offb_ops; 515 info->screen_base = ioremap(address, fix->smem_len); 516 info->pseudo_palette = par->pseudo_palette; 517 info->flags = FBINFO_DEFAULT | foreign_endian; 518 519 fb_alloc_cmap(&info->cmap, 256, 0); 520 521 if (devm_aperture_acquire_for_platform_device(parent, par->base, par->size) < 0) 522 goto out_err; 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 iounmap(par->cmap_adr); 533 par->cmap_adr = NULL; 534 framebuffer_release(info); 535 release_mem_region(res_start, res_size); 536 } 537 538 539 static void offb_init_nodriver(struct platform_device *parent, struct device_node *dp, 540 int no_real_node) 541 { 542 unsigned int len; 543 int i, width = 640, height = 480, depth = 8, pitch = 640; 544 unsigned int flags, rsize, addr_prop = 0; 545 unsigned long max_size = 0; 546 u64 rstart, address = OF_BAD_ADDR; 547 const __be32 *pp, *addrp, *up; 548 u64 asize; 549 int foreign_endian = 0; 550 551 #ifdef __BIG_ENDIAN 552 if (of_property_read_bool(dp, "little-endian")) 553 foreign_endian = FBINFO_FOREIGN_ENDIAN; 554 #else 555 if (of_property_read_bool(dp, "big-endian")) 556 foreign_endian = FBINFO_FOREIGN_ENDIAN; 557 #endif 558 559 pp = of_get_property(dp, "linux,bootx-depth", &len); 560 if (pp == NULL) 561 pp = of_get_property(dp, "depth", &len); 562 if (pp && len == sizeof(u32)) 563 depth = be32_to_cpup(pp); 564 565 pp = of_get_property(dp, "linux,bootx-width", &len); 566 if (pp == NULL) 567 pp = of_get_property(dp, "width", &len); 568 if (pp && len == sizeof(u32)) 569 width = be32_to_cpup(pp); 570 571 pp = of_get_property(dp, "linux,bootx-height", &len); 572 if (pp == NULL) 573 pp = of_get_property(dp, "height", &len); 574 if (pp && len == sizeof(u32)) 575 height = be32_to_cpup(pp); 576 577 pp = of_get_property(dp, "linux,bootx-linebytes", &len); 578 if (pp == NULL) 579 pp = of_get_property(dp, "linebytes", &len); 580 if (pp && len == sizeof(u32) && (*pp != 0xffffffffu)) 581 pitch = be32_to_cpup(pp); 582 else 583 pitch = width * ((depth + 7) / 8); 584 585 rsize = (unsigned long)pitch * (unsigned long)height; 586 587 /* Ok, now we try to figure out the address of the framebuffer. 588 * 589 * Unfortunately, Open Firmware doesn't provide a standard way to do 590 * so. All we can do is a dodgy heuristic that happens to work in 591 * practice. On most machines, the "address" property contains what 592 * we need, though not on Matrox cards found in IBM machines. What I've 593 * found that appears to give good results is to go through the PCI 594 * ranges and pick one that is both big enough and if possible encloses 595 * the "address" property. If none match, we pick the biggest 596 */ 597 up = of_get_property(dp, "linux,bootx-addr", &len); 598 if (up == NULL) 599 up = of_get_property(dp, "address", &len); 600 if (up && len == sizeof(u32)) 601 addr_prop = *up; 602 603 /* Hack for when BootX is passing us */ 604 if (no_real_node) 605 goto skip_addr; 606 607 for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags)) 608 != NULL; i++) { 609 int match_addrp = 0; 610 611 if (!(flags & IORESOURCE_MEM)) 612 continue; 613 if (asize < rsize) 614 continue; 615 rstart = of_translate_address(dp, addrp); 616 if (rstart == OF_BAD_ADDR) 617 continue; 618 if (addr_prop && (rstart <= addr_prop) && 619 ((rstart + asize) >= (addr_prop + rsize))) 620 match_addrp = 1; 621 if (match_addrp) { 622 address = addr_prop; 623 break; 624 } 625 if (rsize > max_size) { 626 max_size = rsize; 627 address = OF_BAD_ADDR; 628 } 629 630 if (address == OF_BAD_ADDR) 631 address = rstart; 632 } 633 skip_addr: 634 if (address == OF_BAD_ADDR && addr_prop) 635 address = (u64)addr_prop; 636 if (address != OF_BAD_ADDR) { 637 #ifdef CONFIG_PCI 638 const __be32 *vidp, *didp; 639 u32 vid, did; 640 struct pci_dev *pdev; 641 642 vidp = of_get_property(dp, "vendor-id", NULL); 643 didp = of_get_property(dp, "device-id", NULL); 644 if (vidp && didp) { 645 vid = be32_to_cpup(vidp); 646 did = be32_to_cpup(didp); 647 pdev = pci_get_device(vid, did, NULL); 648 if (!pdev || pci_enable_device(pdev)) 649 return; 650 } 651 #endif 652 /* kludge for valkyrie */ 653 if (of_node_name_eq(dp, "valkyrie")) 654 address += 0x1000; 655 offb_init_fb(parent, no_real_node ? "bootx" : NULL, 656 width, height, depth, pitch, address, 657 foreign_endian, no_real_node ? NULL : dp); 658 } 659 } 660 661 static int offb_remove(struct platform_device *pdev) 662 { 663 struct fb_info *info = platform_get_drvdata(pdev); 664 665 if (info) 666 unregister_framebuffer(info); 667 668 return 0; 669 } 670 671 static int offb_probe_bootx_noscreen(struct platform_device *pdev) 672 { 673 offb_init_nodriver(pdev, of_chosen, 1); 674 675 return 0; 676 } 677 678 static struct platform_driver offb_driver_bootx_noscreen = { 679 .driver = { 680 .name = "bootx-noscreen", 681 }, 682 .probe = offb_probe_bootx_noscreen, 683 .remove = offb_remove, 684 }; 685 686 static int offb_probe_display(struct platform_device *pdev) 687 { 688 offb_init_nodriver(pdev, pdev->dev.of_node, 0); 689 690 return 0; 691 } 692 693 static const struct of_device_id offb_of_match_display[] = { 694 { .compatible = "display", }, 695 { }, 696 }; 697 MODULE_DEVICE_TABLE(of, offb_of_match_display); 698 699 static struct platform_driver offb_driver_display = { 700 .driver = { 701 .name = "of-display", 702 .of_match_table = offb_of_match_display, 703 }, 704 .probe = offb_probe_display, 705 .remove = offb_remove, 706 }; 707 708 static int __init offb_init(void) 709 { 710 if (fb_get_options("offb", NULL)) 711 return -ENODEV; 712 713 platform_driver_register(&offb_driver_bootx_noscreen); 714 platform_driver_register(&offb_driver_display); 715 716 return 0; 717 } 718 module_init(offb_init); 719 720 static void __exit offb_exit(void) 721 { 722 platform_driver_unregister(&offb_driver_display); 723 platform_driver_unregister(&offb_driver_bootx_noscreen); 724 } 725 module_exit(offb_exit); 726 727 MODULE_LICENSE("GPL"); 728