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/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/tty.h>
  21 #include <linux/slab.h>
  22 #include <linux/vmalloc.h>
  23 #include <linux/delay.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 #include <asm/prom.h>
  31
  32 #ifdef CONFIG_PPC64
  33 #include <asm/pci-bridge.h>
  34 #endif
  35
  36 #ifdef CONFIG_PPC32
  37 #include <asm/bootx.h>
  38 #endif
  39
  40 #include "macmodes.h"
  41
  42 /* Supported palette hacks */
  43 enum {
  44         cmap_unknown,
  45         cmap_m64,               /* ATI Mach64 */
  46         cmap_r128,              /* ATI Rage128 */
  47         cmap_M3A,               /* ATI Rage Mobility M3 Head A */
  48         cmap_M3B,               /* ATI Rage Mobility M3 Head B */
  49         cmap_radeon,            /* ATI Radeon */
  50         cmap_gxt2000,           /* IBM GXT2000 */
  51 };
  52
  53 struct offb_par {
  54         volatile void __iomem *cmap_adr;
  55         volatile void __iomem *cmap_data;
  56         int cmap_type;
  57         int blanked;
  58 };
  59
  60 struct offb_par default_par;
  61
  62     /*
  63      *  Interface used by the world
  64      */
  65
  66 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  67                           u_int transp, struct fb_info *info);
  68 static int offb_blank(int blank, struct fb_info *info);
  69
  70 #ifdef CONFIG_PPC32
  71 extern boot_infos_t *boot_infos;
  72 #endif
  73
  74 static struct fb_ops offb_ops = {
  75         .owner          = THIS_MODULE,
  76         .fb_setcolreg   = offb_setcolreg,
  77         .fb_blank       = offb_blank,
  78         .fb_fillrect    = cfb_fillrect,
  79         .fb_copyarea    = cfb_copyarea,
  80         .fb_imageblit   = cfb_imageblit,
  81 };
  82
  83     /*
  84      *  Set a single color register. The values supplied are already
  85      *  rounded down to the hardware's capabilities (according to the
  86      *  entries in the var structure). Return != 0 for invalid regno.
  87      */
  88
  89 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  90                           u_int transp, struct fb_info *info)
  91 {
  92         struct offb_par *par = (struct offb_par *) info->par;
  93         int i, depth;
  94         u32 *pal = info->pseudo_palette;
  95
  96         depth = info->var.bits_per_pixel;
  97         if (depth == 16)
  98                 depth = (info->var.green.length == 5) ? 15 : 16;
  99
 100         if (regno > 255 ||
 101             (depth == 16 && regno > 63) ||
 102             (depth == 15 && regno > 31))
 103                 return 1;
 104
 105         if (regno < 16) {
 106                 switch (depth) {
 107                 case 15:
 108                         pal[regno] = (regno << 10) | (regno << 5) | regno;
 109                         break;
 110                 case 16:
 111                         pal[regno] = (regno << 11) | (regno << 5) | regno;
 112                         break;
 113                 case 24:
 114                         pal[regno] = (regno << 16) | (regno << 8) | regno;
 115                         break;
 116                 case 32:
 117                         i = (regno << 8) | regno;
 118                         pal[regno] = (i << 16) | i;
 119                         break;
 120                 }
 121         }
 122
 123         red >>= 8;
 124         green >>= 8;
 125         blue >>= 8;
 126
 127         if (!par->cmap_adr)
 128                 return 0;
 129
 130         switch (par->cmap_type) {
 131         case cmap_m64:
 132                 writeb(regno, par->cmap_adr);
 133                 writeb(red, par->cmap_data);
 134                 writeb(green, par->cmap_data);
 135                 writeb(blue, par->cmap_data);
 136                 break;
 137         case cmap_M3A:
 138                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 139                 out_le32(par->cmap_adr + 0x58,
 140                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 141         case cmap_r128:
 142                 /* Set palette index & data */
 143                 out_8(par->cmap_adr + 0xb0, regno);
 144                 out_le32(par->cmap_adr + 0xb4,
 145                          (red << 16 | green << 8 | blue));
 146                 break;
 147         case cmap_M3B:
 148                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 149                 out_le32(par->cmap_adr + 0x58,
 150                          in_le32(par->cmap_adr + 0x58) | 0x20);
 151                 /* Set palette index & data */
 152                 out_8(par->cmap_adr + 0xb0, regno);
 153                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 154                 break;
 155         case cmap_radeon:
 156                 /* Set palette index & data (could be smarter) */
 157                 out_8(par->cmap_adr + 0xb0, regno);
 158                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 159                 break;
 160         case cmap_gxt2000:
 161                 out_le32((unsigned __iomem *) par->cmap_adr + regno,
 162                          (red << 16 | green << 8 | blue));
 163                 break;
 164         }
 165
 166         return 0;
 167 }
 168
 169     /*
 170      *  Blank the display.
 171      */
 172
 173 static int offb_blank(int blank, struct fb_info *info)
 174 {
 175         struct offb_par *par = (struct offb_par *) info->par;
 176         int i, j;
 177
 178         if (!par->cmap_adr)
 179                 return 0;
 180
 181         if (!par->blanked)
 182                 if (!blank)
 183                         return 0;
 184
 185         par->blanked = blank;
 186
 187         if (blank)
 188                 for (i = 0; i < 256; i++) {
 189                         switch (par->cmap_type) {
 190                         case cmap_m64:
 191                                 writeb(i, par->cmap_adr);
 192                                 for (j = 0; j < 3; j++)
 193                                         writeb(0, par->cmap_data);
 194                                 break;
 195                         case cmap_M3A:
 196                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 197                                 out_le32(par->cmap_adr + 0x58,
 198                                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 199                         case cmap_r128:
 200                                 /* Set palette index & data */
 201                                 out_8(par->cmap_adr + 0xb0, i);
 202                                 out_le32(par->cmap_adr + 0xb4, 0);
 203                                 break;
 204                         case cmap_M3B:
 205                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 206                                 out_le32(par->cmap_adr + 0x58,
 207                                          in_le32(par->cmap_adr + 0x58) | 0x20);
 208                                 /* Set palette index & data */
 209                                 out_8(par->cmap_adr + 0xb0, i);
 210                                 out_le32(par->cmap_adr + 0xb4, 0);
 211                                 break;
 212                         case cmap_radeon:
 213                                 out_8(par->cmap_adr + 0xb0, i);
 214                                 out_le32(par->cmap_adr + 0xb4, 0);
 215                                 break;
 216                         case cmap_gxt2000:
 217                                 out_le32((unsigned __iomem *) par->cmap_adr + i,
 218                                          0);
 219                                 break;
 220                         }
 221         } else
 222                 fb_set_cmap(&info->cmap, info);
 223         return 0;
 224 }
 225
 226
 227 static void __iomem *offb_map_reg(struct device_node *np, int index,
 228                                   unsigned long offset, unsigned long size)
 229 {
 230         struct resource r;
 231
 232         if (of_address_to_resource(np, index, &r))
 233                 return 0;
 234         if ((r.start + offset + size) > r.end)
 235                 return 0;
 236         return ioremap(r.start + offset, size);
 237 }
 238
 239 static void __init offb_init_fb(const char *name, const char *full_name,
 240                                 int width, int height, int depth,
 241                                 int pitch, unsigned long address,
 242                                 struct device_node *dp)
 243 {
 244         unsigned long res_size = pitch * height * (depth + 7) / 8;
 245         struct offb_par *par = &default_par;
 246         unsigned long res_start = address;
 247         struct fb_fix_screeninfo *fix;
 248         struct fb_var_screeninfo *var;
 249         struct fb_info *info;
 250         int size;
 251
 252         if (!request_mem_region(res_start, res_size, "offb"))
 253                 return;
 254
 255         printk(KERN_INFO
 256                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 257                width, height, name, address, depth, pitch);
 258         if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
 259                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
 260                        depth);
 261                 release_mem_region(res_start, res_size);
 262                 return;
 263         }
 264
 265         size = sizeof(struct fb_info) + sizeof(u32) * 17;
 266
 267         info = kmalloc(size, GFP_ATOMIC);
 268
 269         if (info == 0) {
 270                 release_mem_region(res_start, res_size);
 271                 return;
 272         }
 273         memset(info, 0, size);
 274
 275         fix = &info->fix;
 276         var = &info->var;
 277
 278         strcpy(fix->id, "OFfb ");
 279         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 280         fix->id[sizeof(fix->id) - 1] = '\0';
 281
 282         var->xres = var->xres_virtual = width;
 283         var->yres = var->yres_virtual = height;
 284         fix->line_length = pitch;
 285
 286         fix->smem_start = address;
 287         fix->smem_len = pitch * height;
 288         fix->type = FB_TYPE_PACKED_PIXELS;
 289         fix->type_aux = 0;
 290
 291         par->cmap_type = cmap_unknown;
 292         if (depth == 8) {
 293                 /* Palette hacks disabled for now */
 294                 if (dp && !strncmp(name, "ATY,Rage128", 11)) {
 295                         par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 296                         if (par->cmap_adr)
 297                                 par->cmap_type = cmap_r128;
 298                 } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
 299                                   || !strncmp(name, "ATY,RageM3p12A", 14))) {
 300                         par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 301                         if (par->cmap_adr)
 302                                 par->cmap_type = cmap_M3A;
 303                 } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
 304                         par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 305                         if (par->cmap_adr)
 306                                 par->cmap_type = cmap_M3B;
 307                 } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
 308                         par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
 309                         if (par->cmap_adr)
 310                                 par->cmap_type = cmap_radeon;
 311                 } else if (!strncmp(name, "ATY,", 4)) {
 312                         unsigned long base = address & 0xff000000UL;
 313                         par->cmap_adr =
 314                             ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
 315                         par->cmap_data = par->cmap_adr + 1;
 316                         par->cmap_type = cmap_m64;
 317                 } else if (dp && device_is_compatible(dp, "pci1014,b7")) {
 318                         par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
 319                         if (par->cmap_adr)
 320                                 par->cmap_type = cmap_gxt2000;
 321                 }
 322                 fix->visual = (par->cmap_type != cmap_unknown) ?
 323                         FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
 324         } else
 325                 fix->visual = FB_VISUAL_TRUECOLOR;
 326
 327         var->xoffset = var->yoffset = 0;
 328         switch (depth) {
 329         case 8:
 330                 var->bits_per_pixel = 8;
 331                 var->red.offset = 0;
 332                 var->red.length = 8;
 333                 var->green.offset = 0;
 334                 var->green.length = 8;
 335                 var->blue.offset = 0;
 336                 var->blue.length = 8;
 337                 var->transp.offset = 0;
 338                 var->transp.length = 0;
 339                 break;
 340         case 15:                /* RGB 555 */
 341                 var->bits_per_pixel = 16;
 342                 var->red.offset = 10;
 343                 var->red.length = 5;
 344                 var->green.offset = 5;
 345                 var->green.length = 5;
 346                 var->blue.offset = 0;
 347                 var->blue.length = 5;
 348                 var->transp.offset = 0;
 349                 var->transp.length = 0;
 350                 break;
 351         case 16:                /* RGB 565 */
 352                 var->bits_per_pixel = 16;
 353                 var->red.offset = 11;
 354                 var->red.length = 5;
 355                 var->green.offset = 5;
 356                 var->green.length = 6;
 357                 var->blue.offset = 0;
 358                 var->blue.length = 5;
 359                 var->transp.offset = 0;
 360                 var->transp.length = 0;
 361                 break;
 362         case 32:                /* RGB 888 */
 363                 var->bits_per_pixel = 32;
 364                 var->red.offset = 16;
 365                 var->red.length = 8;
 366                 var->green.offset = 8;
 367                 var->green.length = 8;
 368                 var->blue.offset = 0;
 369                 var->blue.length = 8;
 370                 var->transp.offset = 24;
 371                 var->transp.length = 8;
 372                 break;
 373         }
 374         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 375             var->transp.msb_right = 0;
 376         var->grayscale = 0;
 377         var->nonstd = 0;
 378         var->activate = 0;
 379         var->height = var->width = -1;
 380         var->pixclock = 10000;
 381         var->left_margin = var->right_margin = 16;
 382         var->upper_margin = var->lower_margin = 16;
 383         var->hsync_len = var->vsync_len = 8;
 384         var->sync = 0;
 385         var->vmode = FB_VMODE_NONINTERLACED;
 386
 387         info->fbops = &offb_ops;
 388         info->screen_base = ioremap(address, fix->smem_len);
 389         info->par = par;
 390         info->pseudo_palette = (void *) (info + 1);
 391         info->flags = FBINFO_DEFAULT;
 392
 393         fb_alloc_cmap(&info->cmap, 256, 0);
 394
 395         if (register_framebuffer(info) < 0) {
 396                 kfree(info);
 397                 release_mem_region(res_start, res_size);
 398                 return;
 399         }
 400
 401         printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
 402                info->node, full_name);
 403 }
 404
 405
 406 static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
 407 {
 408         unsigned int len;
 409         int i, width = 640, height = 480, depth = 8, pitch = 640;
 410         unsigned int flags, rsize, addr_prop = 0;
 411         unsigned long max_size = 0;
 412         u64 rstart, address = OF_BAD_ADDR;
 413         u32 *pp, *addrp, *up;
 414         u64 asize;
 415
 416         pp = (u32 *)get_property(dp, "linux,bootx-depth", &len);
 417         if (pp == NULL)
 418                 pp = (u32 *)get_property(dp, "depth", &len);
 419         if (pp && len == sizeof(u32))
 420                 depth = *pp;
 421
 422         pp = (u32 *)get_property(dp, "linux,bootx-width", &len);
 423         if (pp == NULL)
 424                 pp = (u32 *)get_property(dp, "width", &len);
 425         if (pp && len == sizeof(u32))
 426                 width = *pp;
 427
 428         pp = (u32 *)get_property(dp, "linux,bootx-height", &len);
 429         if (pp == NULL)
 430                 pp = (u32 *)get_property(dp, "height", &len);
 431         if (pp && len == sizeof(u32))
 432                 height = *pp;
 433
 434         pp = (u32 *)get_property(dp, "linux,bootx-linebytes", &len);
 435         if (pp == NULL)
 436                 pp = (u32 *)get_property(dp, "linebytes", &len);
 437         if (pp && len == sizeof(u32))
 438                 pitch = *pp;
 439         else
 440                 pitch = width * ((depth + 7) / 8);
 441
 442         rsize = (unsigned long)pitch * (unsigned long)height;
 443
 444         /* Ok, now we try to figure out the address of the framebuffer.
 445          *
 446          * Unfortunately, Open Firmware doesn't provide a standard way to do
 447          * so. All we can do is a dodgy heuristic that happens to work in
 448          * practice. On most machines, the "address" property contains what
 449          * we need, though not on Matrox cards found in IBM machines. What I've
 450          * found that appears to give good results is to go through the PCI
 451          * ranges and pick one that is both big enough and if possible encloses
 452          * the "address" property. If none match, we pick the biggest
 453          */
 454         up = (u32 *)get_property(dp, "linux,bootx-addr", &len);
 455         if (up == NULL)
 456                 up = (u32 *)get_property(dp, "address", &len);
 457         if (up && len == sizeof(u32))
 458                 addr_prop = *up;
 459
 460         /* Hack for when BootX is passing us */
 461         if (no_real_node)
 462                 goto skip_addr;
 463
 464         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
 465                      != NULL; i++) {
 466                 int match_addrp = 0;
 467
 468                 if (!(flags & IORESOURCE_MEM))
 469                         continue;
 470                 if (asize < rsize)
 471                         continue;
 472                 rstart = of_translate_address(dp, addrp);
 473                 if (rstart == OF_BAD_ADDR)
 474                         continue;
 475                 if (addr_prop && (rstart <= addr_prop) &&
 476                     ((rstart + asize) >= (addr_prop + rsize)))
 477                         match_addrp = 1;
 478                 if (match_addrp) {
 479                         address = addr_prop;
 480                         break;
 481                 }
 482                 if (rsize > max_size) {
 483                         max_size = rsize;
 484                         address = OF_BAD_ADDR;
 485                 }
 486
 487                 if (address == OF_BAD_ADDR)
 488                         address = rstart;
 489         }
 490  skip_addr:
 491         if (address == OF_BAD_ADDR && addr_prop)
 492                 address = (u64)addr_prop;
 493         if (address != OF_BAD_ADDR) {
 494                 /* kludge for valkyrie */
 495                 if (strcmp(dp->name, "valkyrie") == 0)
 496                         address += 0x1000;
 497                 offb_init_fb(no_real_node ? "bootx" : dp->name,
 498                              no_real_node ? "display" : dp->full_name,
 499                              width, height, depth, pitch, address,
 500                              no_real_node ? dp : NULL);
 501         }
 502 }
 503
 504 static int __init offb_init(void)
 505 {
 506         struct device_node *dp = NULL, *boot_disp = NULL;
 507
 508         if (fb_get_options("offb", NULL))
 509                 return -ENODEV;
 510
 511         /* Check if we have a MacOS display without a node spec */
 512         if (get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {
 513                 /* The old code tried to work out which node was the MacOS
 514                  * display based on the address. I'm dropping that since the
 515                  * lack of a node spec only happens with old BootX versions
 516                  * (users can update) and with this code, they'll still get
 517                  * a display (just not the palette hacks).
 518                  */
 519                 offb_init_nodriver(of_chosen, 1);
 520         }
 521
 522         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 523                 if (get_property(dp, "linux,opened", NULL) &&
 524                     get_property(dp, "linux,boot-display", NULL)) {
 525                         boot_disp = dp;
 526                         offb_init_nodriver(dp, 0);
 527                 }
 528         }
 529         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 530                 if (get_property(dp, "linux,opened", NULL) &&
 531                     dp != boot_disp)
 532                         offb_init_nodriver(dp, 0);
 533         }
 534
 535         return 0;
 536 }
 537
 538
 539 module_init(offb_init);
 540 MODULE_LICENSE("GPL");