drivers/video/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/config.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/tty.h>
  22 #include <linux/slab.h>
  23 #include <linux/vmalloc.h>
  24 #include <linux/delay.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 <asm/io.h>
  31 #include <asm/prom.h>
  32
  33 #ifdef CONFIG_PPC64
  34 #include <asm/pci-bridge.h>
  35 #endif
  36
  37 #ifdef CONFIG_PPC32
  38 #include <asm/bootx.h>
  39 #endif
  40
  41 #include "macmodes.h"
  42
  43 /* Supported palette hacks */
  44 enum {
  45         cmap_unknown,
  46         cmap_m64,               /* ATI Mach64 */
  47         cmap_r128,              /* ATI Rage128 */
  48         cmap_M3A,               /* ATI Rage Mobility M3 Head A */
  49         cmap_M3B,               /* ATI Rage Mobility M3 Head B */
  50         cmap_radeon,            /* ATI Radeon */
  51         cmap_gxt2000,           /* IBM GXT2000 */
  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     /*
  64      *  Interface used by the world
  65      */
  66
  67 int offb_init(void);
  68
  69 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  70                           u_int transp, struct fb_info *info);
  71 static int offb_blank(int blank, struct fb_info *info);
  72
  73 #ifdef CONFIG_PPC32
  74 extern boot_infos_t *boot_infos;
  75 #endif
  76
  77 static void offb_init_nodriver(struct device_node *);
  78 static void offb_init_fb(const char *name, const char *full_name,
  79                          int width, int height, int depth, int pitch,
  80                          unsigned long address, struct device_node *dp);
  81
  82 static struct fb_ops offb_ops = {
  83         .owner          = THIS_MODULE,
  84         .fb_setcolreg   = offb_setcolreg,
  85         .fb_blank       = offb_blank,
  86         .fb_fillrect    = cfb_fillrect,
  87         .fb_copyarea    = cfb_copyarea,
  88         .fb_imageblit   = cfb_imageblit,
  89 };
  90
  91     /*
  92      *  Set a single color register. The values supplied are already
  93      *  rounded down to the hardware's capabilities (according to the
  94      *  entries in the var structure). Return != 0 for invalid regno.
  95      */
  96
  97 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  98                           u_int transp, struct fb_info *info)
  99 {
 100         struct offb_par *par = (struct offb_par *) info->par;
 101
 102         if (!par->cmap_adr || regno > 255)
 103                 return 1;
 104
 105         red >>= 8;
 106         green >>= 8;
 107         blue >>= 8;
 108
 109         switch (par->cmap_type) {
 110         case cmap_m64:
 111                 writeb(regno, par->cmap_adr);
 112                 writeb(red, par->cmap_data);
 113                 writeb(green, par->cmap_data);
 114                 writeb(blue, par->cmap_data);
 115                 break;
 116         case cmap_M3A:
 117                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 118                 out_le32(par->cmap_adr + 0x58,
 119                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 120         case cmap_r128:
 121                 /* Set palette index & data */
 122                 out_8(par->cmap_adr + 0xb0, regno);
 123                 out_le32(par->cmap_adr + 0xb4,
 124                          (red << 16 | green << 8 | blue));
 125                 break;
 126         case cmap_M3B:
 127                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 128                 out_le32(par->cmap_adr + 0x58,
 129                          in_le32(par->cmap_adr + 0x58) | 0x20);
 130                 /* Set palette index & data */
 131                 out_8(par->cmap_adr + 0xb0, regno);
 132                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 133                 break;
 134         case cmap_radeon:
 135                 /* Set palette index & data (could be smarter) */
 136                 out_8(par->cmap_adr + 0xb0, regno);
 137                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 138                 break;
 139         case cmap_gxt2000:
 140                 out_le32((unsigned __iomem *) par->cmap_adr + regno,
 141                          (red << 16 | green << 8 | blue));
 142                 break;
 143         }
 144
 145         if (regno < 16)
 146                 switch (info->var.bits_per_pixel) {
 147                 case 16:
 148                         ((u16 *) (info->pseudo_palette))[regno] =
 149                             (regno << 10) | (regno << 5) | regno;
 150                         break;
 151                 case 32:
 152                         {
 153                                 int i = (regno << 8) | regno;
 154                                 ((u32 *) (info->pseudo_palette))[regno] =
 155                                     (i << 16) | i;
 156                                 break;
 157                         }
 158                 }
 159         return 0;
 160 }
 161
 162     /*
 163      *  Blank the display.
 164      */
 165
 166 static int offb_blank(int blank, struct fb_info *info)
 167 {
 168         struct offb_par *par = (struct offb_par *) info->par;
 169         int i, j;
 170
 171         if (!par->cmap_adr)
 172                 return 0;
 173
 174         if (!par->blanked)
 175                 if (!blank)
 176                         return 0;
 177
 178         par->blanked = blank;
 179
 180         if (blank)
 181                 for (i = 0; i < 256; i++) {
 182                         switch (par->cmap_type) {
 183                         case cmap_m64:
 184                                 writeb(i, par->cmap_adr);
 185                                 for (j = 0; j < 3; j++)
 186                                         writeb(0, par->cmap_data);
 187                                 break;
 188                         case cmap_M3A:
 189                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 190                                 out_le32(par->cmap_adr + 0x58,
 191                                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 192                         case cmap_r128:
 193                                 /* Set palette index & data */
 194                                 out_8(par->cmap_adr + 0xb0, i);
 195                                 out_le32(par->cmap_adr + 0xb4, 0);
 196                                 break;
 197                         case cmap_M3B:
 198                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 199                                 out_le32(par->cmap_adr + 0x58,
 200                                          in_le32(par->cmap_adr + 0x58) | 0x20);
 201                                 /* Set palette index & data */
 202                                 out_8(par->cmap_adr + 0xb0, i);
 203                                 out_le32(par->cmap_adr + 0xb4, 0);
 204                                 break;
 205                         case cmap_radeon:
 206                                 out_8(par->cmap_adr + 0xb0, i);
 207                                 out_le32(par->cmap_adr + 0xb4, 0);
 208                                 break;
 209                         case cmap_gxt2000:
 210                                 out_le32((unsigned __iomem *) par->cmap_adr + i,
 211                                          0);
 212                                 break;
 213                         }
 214         } else
 215                 fb_set_cmap(&info->cmap, info);
 216         return 0;
 217 }
 218
 219     /*
 220      *  Initialisation
 221      */
 222
 223 int __init offb_init(void)
 224 {
 225         struct device_node *dp = NULL, *boot_disp = NULL;
 226
 227 #if defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32)
 228         struct device_node *macos_display = NULL;
 229 #endif
 230         if (fb_get_options("offb", NULL))
 231                 return -ENODEV;
 232
 233 #if defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32)
 234         /* If we're booted from BootX... */
 235         if (boot_infos != 0) {
 236                 unsigned long addr =
 237                     (unsigned long) boot_infos->dispDeviceBase;
 238                 u32 *addrp;
 239                 u64 daddr, dsize;
 240                 unsigned int flags;
 241
 242                 /* find the device node corresponding to the macos display */
 243                 while ((dp = of_find_node_by_type(dp, "display"))) {
 244                         int i;
 245
 246                         /*
 247                          * Look for an AAPL,address property first.
 248                          */
 249                         unsigned int na;
 250                         unsigned int *ap =
 251                                 (unsigned int *)get_property(dp, "AAPL,address",
 252                                                              &na);
 253                         if (ap != 0) {
 254                                 for (na /= sizeof(unsigned int); na > 0;
 255                                      --na, ++ap)
 256                                         if (*ap <= addr &&
 257                                             addr < *ap + 0x1000000) {
 258                                                 macos_display = dp;
 259                                                 goto foundit;
 260                                         }
 261                         }
 262
 263                         /*
 264                          * See if the display address is in one of the address
 265                          * ranges for this display.
 266                          */
 267                         i = 0;
 268                         for (;;) {
 269                                 addrp = of_get_address(dp, i++, &dsize, &flags);
 270                                 if (addrp == NULL)
 271                                         break;
 272                                 if (!(flags & IORESOURCE_MEM))
 273                                         continue;
 274                                 daddr = of_translate_address(dp, addrp);
 275                                 if (daddr == OF_BAD_ADDR)
 276                                         continue;
 277                                 if (daddr <= addr && addr < (daddr + dsize)) {
 278                                         macos_display = dp;
 279                                         goto foundit;
 280                                 }
 281                         }
 282                 foundit:
 283                         if (macos_display) {
 284                                 printk(KERN_INFO "MacOS display is %s\n",
 285                                        dp->full_name);
 286                                 break;
 287                         }
 288                 }
 289
 290                 /* initialize it */
 291                 offb_init_fb(macos_display ? macos_display->
 292                              name : "MacOS display",
 293                              macos_display ? macos_display->
 294                              full_name : "MacOS display",
 295                              boot_infos->dispDeviceRect[2],
 296                              boot_infos->dispDeviceRect[3],
 297                              boot_infos->dispDeviceDepth,
 298                              boot_infos->dispDeviceRowBytes, addr, NULL);
 299         }
 300 #endif /* defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32) */
 301
 302         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 303                 if (get_property(dp, "linux,opened", NULL) &&
 304                     get_property(dp, "linux,boot-display", NULL)) {
 305                         boot_disp = dp;
 306                         offb_init_nodriver(dp);
 307                 }
 308         }
 309         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 310                 if (get_property(dp, "linux,opened", NULL) &&
 311                     dp != boot_disp)
 312                         offb_init_nodriver(dp);
 313         }
 314
 315         return 0;
 316 }
 317
 318
 319 static void __init offb_init_nodriver(struct device_node *dp)
 320 {
 321         int *pp, i;
 322         unsigned int len;
 323         int width = 640, height = 480, depth = 8, pitch;
 324         unsigned  flags, rsize, *up, addr_prop = 0;
 325         unsigned long max_size = 0;
 326         u64 rstart, address = OF_BAD_ADDR;
 327         u32 *addrp;
 328         u64 asize;
 329
 330         if ((pp = (int *) get_property(dp, "depth", &len)) != NULL
 331             && len == sizeof(int))
 332                 depth = *pp;
 333         if ((pp = (int *) get_property(dp, "width", &len)) != NULL
 334             && len == sizeof(int))
 335                 width = *pp;
 336         if ((pp = (int *) get_property(dp, "height", &len)) != NULL
 337             && len == sizeof(int))
 338                 height = *pp;
 339         if ((pp = (int *) get_property(dp, "linebytes", &len)) != NULL
 340             && len == sizeof(int)) {
 341                 pitch = *pp;
 342                 if (pitch == 1)
 343                         pitch = 0x1000;
 344         } else
 345                 pitch = width;
 346
 347         rsize = (unsigned long)pitch * (unsigned long)height *
 348                 (unsigned long)(depth / 8);
 349
 350         /* Ok, now we try to figure out the address of the framebuffer.
 351          *
 352          * Unfortunately, Open Firmware doesn't provide a standard way to do
 353          * so. All we can do is a dodgy heuristic that happens to work in
 354          * practice. On most machines, the "address" property contains what
 355          * we need, though not on Matrox cards found in IBM machines. What I've
 356          * found that appears to give good results is to go through the PCI
 357          * ranges and pick one that is both big enough and if possible encloses
 358          * the "address" property. If none match, we pick the biggest
 359          */
 360         up = (unsigned int *) get_property(dp, "address", &len);
 361         if (up && len == sizeof(unsigned int))
 362                 addr_prop = *up;
 363
 364         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
 365                      != NULL; i++) {
 366                 int match_addrp = 0;
 367
 368                 if (!(flags & IORESOURCE_MEM))
 369                         continue;
 370                 if (asize < rsize)
 371                         continue;
 372                 rstart = of_translate_address(dp, addrp);
 373                 if (rstart == OF_BAD_ADDR)
 374                         continue;
 375                 if (addr_prop && (rstart <= addr_prop) &&
 376                     ((rstart + rsize) > addr_prop))
 377                         match_addrp = 1;
 378                 if (match_addrp) {
 379                         address = addr_prop;
 380                         break;
 381                 }
 382                 if (rsize > max_size) {
 383                         max_size = rsize;
 384                         address = OF_BAD_ADDR;
 385                 }
 386                 if (address == OF_BAD_ADDR)
 387                         address = rstart;
 388         }
 389         if (address == OF_BAD_ADDR && addr_prop)
 390                 address = (u_long)addr_prop;
 391         if (address != OF_BAD_ADDR) {
 392                 /* kludge for valkyrie */
 393                 if (strcmp(dp->name, "valkyrie") == 0)
 394                         address += 0x1000;
 395                 offb_init_fb(dp->name, dp->full_name, width, height, depth,
 396                              pitch, address, dp);
 397         }
 398 }
 399
 400 static void __init offb_init_fb(const char *name, const char *full_name,
 401                                 int width, int height, int depth,
 402                                 int pitch, unsigned long address,
 403                                 struct device_node *dp)
 404 {
 405         unsigned long res_size = pitch * height * depth / 8;
 406         struct offb_par *par = &default_par;
 407         unsigned long res_start = address;
 408         struct fb_fix_screeninfo *fix;
 409         struct fb_var_screeninfo *var;
 410         struct fb_info *info;
 411         int size;
 412
 413         if (!request_mem_region(res_start, res_size, "offb"))
 414                 return;
 415
 416         printk(KERN_INFO
 417                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 418                width, height, name, address, depth, pitch);
 419         if (depth != 8 && depth != 16 && depth != 32) {
 420                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
 421                        depth);
 422                 release_mem_region(res_start, res_size);
 423                 return;
 424         }
 425
 426         size = sizeof(struct fb_info) + sizeof(u32) * 17;
 427
 428         info = kmalloc(size, GFP_ATOMIC);
 429
 430         if (info == 0) {
 431                 release_mem_region(res_start, res_size);
 432                 return;
 433         }
 434         memset(info, 0, size);
 435
 436         fix = &info->fix;
 437         var = &info->var;
 438
 439         strcpy(fix->id, "OFfb ");
 440         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 441         fix->id[sizeof(fix->id) - 1] = '\0';
 442
 443         var->xres = var->xres_virtual = width;
 444         var->yres = var->yres_virtual = height;
 445         fix->line_length = pitch;
 446
 447         fix->smem_start = address;
 448         fix->smem_len = pitch * height;
 449         fix->type = FB_TYPE_PACKED_PIXELS;
 450         fix->type_aux = 0;
 451
 452         par->cmap_type = cmap_unknown;
 453         if (depth == 8) {
 454
 455                 /* Palette hacks disabled for now */
 456 #if 0
 457                 if (dp && !strncmp(name, "ATY,Rage128", 11)) {
 458                         unsigned long regbase = dp->addrs[2].address;
 459                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 460                         par->cmap_type = cmap_r128;
 461                 } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
 462                                   || !strncmp(name, "ATY,RageM3p12A", 14))) {
 463                         unsigned long regbase =
 464                             dp->parent->addrs[2].address;
 465                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 466                         par->cmap_type = cmap_M3A;
 467                 } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
 468                         unsigned long regbase =
 469                             dp->parent->addrs[2].address;
 470                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 471                         par->cmap_type = cmap_M3B;
 472                 } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
 473                         unsigned long regbase = dp->addrs[1].address;
 474                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 475                         par->cmap_type = cmap_radeon;
 476                 } else if (!strncmp(name, "ATY,", 4)) {
 477                         unsigned long base = address & 0xff000000UL;
 478                         par->cmap_adr =
 479                             ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
 480                         par->cmap_data = par->cmap_adr + 1;
 481                         par->cmap_type = cmap_m64;
 482                 } else if (device_is_compatible(dp, "pci1014,b7")) {
 483                         unsigned long regbase = dp->addrs[0].address;
 484                         par->cmap_adr = ioremap(regbase + 0x6000, 0x1000);
 485                         par->cmap_type = cmap_gxt2000;
 486                 }
 487 #endif
 488                 fix->visual = par->cmap_adr ? FB_VISUAL_PSEUDOCOLOR
 489                     : FB_VISUAL_STATIC_PSEUDOCOLOR;
 490         } else
 491                 fix->visual =   /* par->cmap_adr ? FB_VISUAL_DIRECTCOLOR
 492                                    : */ FB_VISUAL_TRUECOLOR;
 493
 494         var->xoffset = var->yoffset = 0;
 495         var->bits_per_pixel = depth;
 496         switch (depth) {
 497         case 8:
 498                 var->bits_per_pixel = 8;
 499                 var->red.offset = 0;
 500                 var->red.length = 8;
 501                 var->green.offset = 0;
 502                 var->green.length = 8;
 503                 var->blue.offset = 0;
 504                 var->blue.length = 8;
 505                 var->transp.offset = 0;
 506                 var->transp.length = 0;
 507                 break;
 508         case 16:                /* RGB 555 */
 509                 var->bits_per_pixel = 16;
 510                 var->red.offset = 10;
 511                 var->red.length = 5;
 512                 var->green.offset = 5;
 513                 var->green.length = 5;
 514                 var->blue.offset = 0;
 515                 var->blue.length = 5;
 516                 var->transp.offset = 0;
 517                 var->transp.length = 0;
 518                 break;
 519         case 32:                /* RGB 888 */
 520                 var->bits_per_pixel = 32;
 521                 var->red.offset = 16;
 522                 var->red.length = 8;
 523                 var->green.offset = 8;
 524                 var->green.length = 8;
 525                 var->blue.offset = 0;
 526                 var->blue.length = 8;
 527                 var->transp.offset = 24;
 528                 var->transp.length = 8;
 529                 break;
 530         }
 531         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 532             var->transp.msb_right = 0;
 533         var->grayscale = 0;
 534         var->nonstd = 0;
 535         var->activate = 0;
 536         var->height = var->width = -1;
 537         var->pixclock = 10000;
 538         var->left_margin = var->right_margin = 16;
 539         var->upper_margin = var->lower_margin = 16;
 540         var->hsync_len = var->vsync_len = 8;
 541         var->sync = 0;
 542         var->vmode = FB_VMODE_NONINTERLACED;
 543
 544         info->fbops = &offb_ops;
 545         info->screen_base = ioremap(address, fix->smem_len);
 546         info->par = par;
 547         info->pseudo_palette = (void *) (info + 1);
 548         info->flags = FBINFO_DEFAULT;
 549
 550         fb_alloc_cmap(&info->cmap, 256, 0);
 551
 552         if (register_framebuffer(info) < 0) {
 553                 kfree(info);
 554                 release_mem_region(res_start, res_size);
 555                 return;
 556         }
 557
 558         printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
 559                info->node, full_name);
 560 }
 561
 562 module_init(offb_init);
 563 MODULE_LICENSE("GPL");