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offb.c
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linux-6.19.14/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/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 */ 40enum { 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 52struct 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 63extern 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 99static 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 191static 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 253static 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 283static 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 294static 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 303static 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 325static 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 __free(device_node) = 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 } else if (dp && of_device_is_compatible(dp, "qemu,std-vga")) { 373#ifdef __BIG_ENDIAN 374 const __be32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 }; 375#else 376 const __be32 io_of_addr[3] = { 0x00000001, 0x0, 0x0 }; 377#endif 378 u64 io_addr = of_translate_address(dp, io_of_addr); 379 if (io_addr != OF_BAD_ADDR) { 380 par->cmap_adr = ioremap(io_addr + 0x3c8, 2); 381 if (par->cmap_adr) { 382 par->cmap_type = cmap_simple; 383 par->cmap_data = par->cmap_adr + 1; 384 } 385 } 386 } 387 info->fix.visual = (par->cmap_type != cmap_unknown) ? 388 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR; 389} 390 391static void offb_init_fb(struct platform_device *parent, const char *name, 392 int width, int height, int depth, 393 int pitch, unsigned long address, 394 int foreign_endian, struct device_node *dp) 395{ 396 unsigned long res_size = pitch * height; 397 unsigned long res_start = address; 398 struct fb_fix_screeninfo *fix; 399 struct fb_var_screeninfo *var; 400 struct fb_info *info; 401 struct offb_par *par; 402 403 if (!request_mem_region(res_start, res_size, "offb")) 404 return; 405 406 printk(KERN_INFO 407 "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n", 408 width, height, name, address, depth, pitch); 409 if (depth != 8 && depth != 15 && depth != 16 && depth != 32) { 410 printk(KERN_ERR "%pOF: can't use depth = %d\n", dp, depth); 411 release_mem_region(res_start, res_size); 412 return; 413 } 414 415 info = framebuffer_alloc(sizeof(*par), &parent->dev); 416 if (!info) { 417 release_mem_region(res_start, res_size); 418 return; 419 } 420 platform_set_drvdata(parent, info); 421 par = info->par; 422 fix = &info->fix; 423 var = &info->var; 424 425 if (name) 426 snprintf(fix->id, sizeof(fix->id), "OFfb %s", name); 427 else 428 snprintf(fix->id, sizeof(fix->id), "OFfb %pOFn", dp); 429 430 431 var->xres = var->xres_virtual = width; 432 var->yres = var->yres_virtual = height; 433 fix->line_length = pitch; 434 435 fix->smem_start = address; 436 fix->smem_len = pitch * height; 437 fix->type = FB_TYPE_PACKED_PIXELS; 438 fix->type_aux = 0; 439 440 par->cmap_type = cmap_unknown; 441 if (depth == 8) 442 offb_init_palette_hacks(info, dp, address); 443 else 444 fix->visual = FB_VISUAL_TRUECOLOR; 445 446 var->xoffset = var->yoffset = 0; 447 switch (depth) { 448 case 8: 449 var->bits_per_pixel = 8; 450 var->red.offset = 0; 451 var->red.length = 8; 452 var->green.offset = 0; 453 var->green.length = 8; 454 var->blue.offset = 0; 455 var->blue.length = 8; 456 var->transp.offset = 0; 457 var->transp.length = 0; 458 break; 459 case 15: /* RGB 555 */ 460 var->bits_per_pixel = 16; 461 var->red.offset = 10; 462 var->red.length = 5; 463 var->green.offset = 5; 464 var->green.length = 5; 465 var->blue.offset = 0; 466 var->blue.length = 5; 467 var->transp.offset = 0; 468 var->transp.length = 0; 469 break; 470 case 16: /* RGB 565 */ 471 var->bits_per_pixel = 16; 472 var->red.offset = 11; 473 var->red.length = 5; 474 var->green.offset = 5; 475 var->green.length = 6; 476 var->blue.offset = 0; 477 var->blue.length = 5; 478 var->transp.offset = 0; 479 var->transp.length = 0; 480 break; 481 case 32: /* RGB 888 */ 482 var->bits_per_pixel = 32; 483 var->red.offset = 16; 484 var->red.length = 8; 485 var->green.offset = 8; 486 var->green.length = 8; 487 var->blue.offset = 0; 488 var->blue.length = 8; 489 var->transp.offset = 24; 490 var->transp.length = 8; 491 break; 492 } 493 var->red.msb_right = var->green.msb_right = var->blue.msb_right = 494 var->transp.msb_right = 0; 495 var->grayscale = 0; 496 var->nonstd = 0; 497 var->activate = 0; 498 var->height = var->width = -1; 499 var->pixclock = 10000; 500 var->left_margin = var->right_margin = 16; 501 var->upper_margin = var->lower_margin = 16; 502 var->hsync_len = var->vsync_len = 8; 503 var->sync = 0; 504 var->vmode = FB_VMODE_NONINTERLACED; 505 506 par->base = address; 507 par->size = fix->smem_len; 508 509 info->fbops = &offb_ops; 510 info->screen_base = ioremap(address, fix->smem_len); 511 info->pseudo_palette = par->pseudo_palette; 512 info->flags = foreign_endian; 513 514 fb_alloc_cmap(&info->cmap, 256, 0); 515 516 if (devm_aperture_acquire_for_platform_device(parent, par->base, par->size) < 0) 517 goto out_err; 518 if (register_framebuffer(info) < 0) 519 goto out_err; 520 521 fb_info(info, "Open Firmware frame buffer device on %pOF\n", dp); 522 return; 523 524out_err: 525 fb_dealloc_cmap(&info->cmap); 526 iounmap(info->screen_base); 527 iounmap(par->cmap_adr); 528 par->cmap_adr = NULL; 529 framebuffer_release(info); 530 release_mem_region(res_start, res_size); 531} 532 533 534static void offb_init_nodriver(struct platform_device *parent, struct device_node *dp, 535 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_property_read_bool(dp, "little-endian")) 548 foreign_endian = FBINFO_FOREIGN_ENDIAN; 549#else 550 if (of_property_read_bool(dp, "big-endian")) 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#ifdef CONFIG_PCI 633 const __be32 *vidp, *didp; 634 u32 vid, did; 635 struct pci_dev *pdev; 636 637 vidp = of_get_property(dp, "vendor-id", NULL); 638 didp = of_get_property(dp, "device-id", NULL); 639 if (vidp && didp) { 640 vid = be32_to_cpup(vidp); 641 did = be32_to_cpup(didp); 642 pdev = pci_get_device(vid, did, NULL); 643 if (!pdev || pci_enable_device(pdev)) 644 return; 645 } 646#endif 647 /* kludge for valkyrie */ 648 if (of_node_name_eq(dp, "valkyrie")) 649 address += 0x1000; 650 offb_init_fb(parent, no_real_node ? "bootx" : NULL, 651 width, height, depth, pitch, address, 652 foreign_endian, no_real_node ? NULL : dp); 653 } 654} 655 656static void offb_remove(struct platform_device *pdev) 657{ 658 struct fb_info *info = platform_get_drvdata(pdev); 659 660 if (info) 661 unregister_framebuffer(info); 662} 663 664static int offb_probe_bootx_noscreen(struct platform_device *pdev) 665{ 666 offb_init_nodriver(pdev, of_chosen, 1); 667 668 return 0; 669} 670 671static struct platform_driver offb_driver_bootx_noscreen = { 672 .driver = { 673 .name = "bootx-noscreen", 674 }, 675 .probe = offb_probe_bootx_noscreen, 676 .remove = offb_remove, 677}; 678 679static int offb_probe_display(struct platform_device *pdev) 680{ 681 offb_init_nodriver(pdev, pdev->dev.of_node, 0); 682 683 return 0; 684} 685 686static const struct of_device_id offb_of_match_display[] = { 687 { .compatible = "display", }, 688 { }, 689}; 690MODULE_DEVICE_TABLE(of, offb_of_match_display); 691 692static struct platform_driver offb_driver_display = { 693 .driver = { 694 .name = "of-display", 695 .of_match_table = offb_of_match_display, 696 }, 697 .probe = offb_probe_display, 698 .remove = offb_remove, 699}; 700 701static int __init offb_init(void) 702{ 703 if (fb_get_options("offb", NULL)) 704 return -ENODEV; 705 706 platform_driver_register(&offb_driver_bootx_noscreen); 707 platform_driver_register(&offb_driver_display); 708 709 return 0; 710} 711module_init(offb_init); 712 713static void __exit offb_exit(void) 714{ 715 platform_driver_unregister(&offb_driver_display); 716 platform_driver_unregister(&offb_driver_bootx_noscreen); 717} 718module_exit(offb_exit); 719 720MODULE_DESCRIPTION("Open Firmware frame buffer device driver"); 721MODULE_LICENSE("GPL");
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