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/slab.h>
  21 #include <linux/vmalloc.h>
  22 #include <linux/delay.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/fb.h>
  25 #include <linux/init.h>
  26 #include <linux/ioport.h>
  27 #include <linux/pci.h>
  28 #include <asm/io.h>
  29 #include <asm/prom.h>
  30
  31 #ifdef CONFIG_PPC64
  32 #include <asm/pci-bridge.h>
  33 #endif
  34
  35 #ifdef CONFIG_PPC32
  36 #include <asm/bootx.h>
  37 #endif
  38
  39 #include "macmodes.h"
  40
  41 /* Supported palette hacks */
  42 enum {
  43         cmap_unknown,
  44         cmap_m64,               /* ATI Mach64 */
  45         cmap_r128,              /* ATI Rage128 */
  46         cmap_M3A,               /* ATI Rage Mobility M3 Head A */
  47         cmap_M3B,               /* ATI Rage Mobility M3 Head B */
  48         cmap_radeon,            /* ATI Radeon */
  49         cmap_gxt2000,           /* IBM GXT2000 */
  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 };
  58
  59 struct offb_par default_par;
  60
  61     /*
  62      *  Interface used by the world
  63      */
  64
  65 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  66                           u_int transp, struct fb_info *info);
  67 static int offb_blank(int blank, struct fb_info *info);
  68
  69 #ifdef CONFIG_PPC32
  70 extern boot_infos_t *boot_infos;
  71 #endif
  72
  73 static struct fb_ops offb_ops = {
  74         .owner          = THIS_MODULE,
  75         .fb_setcolreg   = offb_setcolreg,
  76         .fb_blank       = offb_blank,
  77         .fb_fillrect    = cfb_fillrect,
  78         .fb_copyarea    = cfb_copyarea,
  79         .fb_imageblit   = cfb_imageblit,
  80 };
  81
  82     /*
  83      *  Set a single color register. The values supplied are already
  84      *  rounded down to the hardware's capabilities (according to the
  85      *  entries in the var structure). Return != 0 for invalid regno.
  86      */
  87
  88 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  89                           u_int transp, struct fb_info *info)
  90 {
  91         struct offb_par *par = (struct offb_par *) info->par;
  92         int i, depth;
  93         u32 *pal = info->pseudo_palette;
  94
  95         depth = info->var.bits_per_pixel;
  96         if (depth == 16)
  97                 depth = (info->var.green.length == 5) ? 15 : 16;
  98
  99         if (regno > 255 ||
 100             (depth == 16 && regno > 63) ||
 101             (depth == 15 && regno > 31))
 102                 return 1;
 103
 104         if (regno < 16) {
 105                 switch (depth) {
 106                 case 15:
 107                         pal[regno] = (regno << 10) | (regno << 5) | regno;
 108                         break;
 109                 case 16:
 110                         pal[regno] = (regno << 11) | (regno << 5) | regno;
 111                         break;
 112                 case 24:
 113                         pal[regno] = (regno << 16) | (regno << 8) | regno;
 114                         break;
 115                 case 32:
 116                         i = (regno << 8) | regno;
 117                         pal[regno] = (i << 16) | i;
 118                         break;
 119                 }
 120         }
 121
 122         red >>= 8;
 123         green >>= 8;
 124         blue >>= 8;
 125
 126         if (!par->cmap_adr)
 127                 return 0;
 128
 129         switch (par->cmap_type) {
 130         case cmap_m64:
 131                 writeb(regno, par->cmap_adr);
 132                 writeb(red, par->cmap_data);
 133                 writeb(green, par->cmap_data);
 134                 writeb(blue, par->cmap_data);
 135                 break;
 136         case cmap_M3A:
 137                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 138                 out_le32(par->cmap_adr + 0x58,
 139                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 140         case cmap_r128:
 141                 /* Set palette index & data */
 142                 out_8(par->cmap_adr + 0xb0, regno);
 143                 out_le32(par->cmap_adr + 0xb4,
 144                          (red << 16 | green << 8 | blue));
 145                 break;
 146         case cmap_M3B:
 147                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 148                 out_le32(par->cmap_adr + 0x58,
 149                          in_le32(par->cmap_adr + 0x58) | 0x20);
 150                 /* Set palette index & data */
 151                 out_8(par->cmap_adr + 0xb0, regno);
 152                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 153                 break;
 154         case cmap_radeon:
 155                 /* Set palette index & data (could be smarter) */
 156                 out_8(par->cmap_adr + 0xb0, regno);
 157                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 158                 break;
 159         case cmap_gxt2000:
 160                 out_le32((unsigned __iomem *) par->cmap_adr + regno,
 161                          (red << 16 | green << 8 | blue));
 162                 break;
 163         }
 164
 165         return 0;
 166 }
 167
 168     /*
 169      *  Blank the display.
 170      */
 171
 172 static int offb_blank(int blank, struct fb_info *info)
 173 {
 174         struct offb_par *par = (struct offb_par *) info->par;
 175         int i, j;
 176
 177         if (!par->cmap_adr)
 178                 return 0;
 179
 180         if (!par->blanked)
 181                 if (!blank)
 182                         return 0;
 183
 184         par->blanked = blank;
 185
 186         if (blank)
 187                 for (i = 0; i < 256; i++) {
 188                         switch (par->cmap_type) {
 189                         case cmap_m64:
 190                                 writeb(i, par->cmap_adr);
 191                                 for (j = 0; j < 3; j++)
 192                                         writeb(0, par->cmap_data);
 193                                 break;
 194                         case cmap_M3A:
 195                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 196                                 out_le32(par->cmap_adr + 0x58,
 197                                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 198                         case cmap_r128:
 199                                 /* Set palette index & data */
 200                                 out_8(par->cmap_adr + 0xb0, i);
 201                                 out_le32(par->cmap_adr + 0xb4, 0);
 202                                 break;
 203                         case cmap_M3B:
 204                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 205                                 out_le32(par->cmap_adr + 0x58,
 206                                          in_le32(par->cmap_adr + 0x58) | 0x20);
 207                                 /* Set palette index & data */
 208                                 out_8(par->cmap_adr + 0xb0, i);
 209                                 out_le32(par->cmap_adr + 0xb4, 0);
 210                                 break;
 211                         case cmap_radeon:
 212                                 out_8(par->cmap_adr + 0xb0, i);
 213                                 out_le32(par->cmap_adr + 0xb4, 0);
 214                                 break;
 215                         case cmap_gxt2000:
 216                                 out_le32((unsigned __iomem *) par->cmap_adr + i,
 217                                          0);
 218                                 break;
 219                         }
 220         } else
 221                 fb_set_cmap(&info->cmap, info);
 222         return 0;
 223 }
 224
 225
 226 static void __iomem *offb_map_reg(struct device_node *np, int index,
 227                                   unsigned long offset, unsigned long size)
 228 {
 229         struct resource r;
 230
 231         if (of_address_to_resource(np, index, &r))
 232                 return 0;
 233         if ((r.start + offset + size) > r.end)
 234                 return 0;
 235         return ioremap(r.start + offset, size);
 236 }
 237
 238 static void __init offb_init_fb(const char *name, const char *full_name,
 239                                 int width, int height, int depth,
 240                                 int pitch, unsigned long address,
 241                                 struct device_node *dp)
 242 {
 243         unsigned long res_size = pitch * height * (depth + 7) / 8;
 244         struct offb_par *par = &default_par;
 245         unsigned long res_start = address;
 246         struct fb_fix_screeninfo *fix;
 247         struct fb_var_screeninfo *var;
 248         struct fb_info *info;
 249         int size;
 250
 251         if (!request_mem_region(res_start, res_size, "offb"))
 252                 return;
 253
 254         printk(KERN_INFO
 255                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 256                width, height, name, address, depth, pitch);
 257         if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
 258                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
 259                        depth);
 260                 release_mem_region(res_start, res_size);
 261                 return;
 262         }
 263
 264         size = sizeof(struct fb_info) + sizeof(u32) * 17;
 265
 266         info = kmalloc(size, GFP_ATOMIC);
 267
 268         if (info == 0) {
 269                 release_mem_region(res_start, res_size);
 270                 return;
 271         }
 272         memset(info, 0, size);
 273
 274         fix = &info->fix;
 275         var = &info->var;
 276
 277         strcpy(fix->id, "OFfb ");
 278         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 279         fix->id[sizeof(fix->id) - 1] = '\0';
 280
 281         var->xres = var->xres_virtual = width;
 282         var->yres = var->yres_virtual = height;
 283         fix->line_length = pitch;
 284
 285         fix->smem_start = address;
 286         fix->smem_len = pitch * height;
 287         fix->type = FB_TYPE_PACKED_PIXELS;
 288         fix->type_aux = 0;
 289
 290         par->cmap_type = cmap_unknown;
 291         if (depth == 8) {
 292                 /* Palette hacks disabled for now */
 293                 if (dp && !strncmp(name, "ATY,Rage128", 11)) {
 294                         par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 295                         if (par->cmap_adr)
 296                                 par->cmap_type = cmap_r128;
 297                 } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
 298                                   || !strncmp(name, "ATY,RageM3p12A", 14))) {
 299                         par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 300                         if (par->cmap_adr)
 301                                 par->cmap_type = cmap_M3A;
 302                 } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
 303                         par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
 304                         if (par->cmap_adr)
 305                                 par->cmap_type = cmap_M3B;
 306                 } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
 307                         par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
 308                         if (par->cmap_adr)
 309                                 par->cmap_type = cmap_radeon;
 310                 } else if (!strncmp(name, "ATY,", 4)) {
 311                         unsigned long base = address & 0xff000000UL;
 312                         par->cmap_adr =
 313                             ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
 314                         par->cmap_data = par->cmap_adr + 1;
 315                         par->cmap_type = cmap_m64;
 316                 } else if (dp && device_is_compatible(dp, "pci1014,b7")) {
 317                         par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
 318                         if (par->cmap_adr)
 319                                 par->cmap_type = cmap_gxt2000;
 320                 }
 321                 fix->visual = (par->cmap_type != cmap_unknown) ?
 322                         FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
 323         } else
 324                 fix->visual = FB_VISUAL_TRUECOLOR;
 325
 326         var->xoffset = var->yoffset = 0;
 327         switch (depth) {
 328         case 8:
 329                 var->bits_per_pixel = 8;
 330                 var->red.offset = 0;
 331                 var->red.length = 8;
 332                 var->green.offset = 0;
 333                 var->green.length = 8;
 334                 var->blue.offset = 0;
 335                 var->blue.length = 8;
 336                 var->transp.offset = 0;
 337                 var->transp.length = 0;
 338                 break;
 339         case 15:                /* RGB 555 */
 340                 var->bits_per_pixel = 16;
 341                 var->red.offset = 10;
 342                 var->red.length = 5;
 343                 var->green.offset = 5;
 344                 var->green.length = 5;
 345                 var->blue.offset = 0;
 346                 var->blue.length = 5;
 347                 var->transp.offset = 0;
 348                 var->transp.length = 0;
 349                 break;
 350         case 16:                /* RGB 565 */
 351                 var->bits_per_pixel = 16;
 352                 var->red.offset = 11;
 353                 var->red.length = 5;
 354                 var->green.offset = 5;
 355                 var->green.length = 6;
 356                 var->blue.offset = 0;
 357                 var->blue.length = 5;
 358                 var->transp.offset = 0;
 359                 var->transp.length = 0;
 360                 break;
 361         case 32:                /* RGB 888 */
 362                 var->bits_per_pixel = 32;
 363                 var->red.offset = 16;
 364                 var->red.length = 8;
 365                 var->green.offset = 8;
 366                 var->green.length = 8;
 367                 var->blue.offset = 0;
 368                 var->blue.length = 8;
 369                 var->transp.offset = 24;
 370                 var->transp.length = 8;
 371                 break;
 372         }
 373         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 374             var->transp.msb_right = 0;
 375         var->grayscale = 0;
 376         var->nonstd = 0;
 377         var->activate = 0;
 378         var->height = var->width = -1;
 379         var->pixclock = 10000;
 380         var->left_margin = var->right_margin = 16;
 381         var->upper_margin = var->lower_margin = 16;
 382         var->hsync_len = var->vsync_len = 8;
 383         var->sync = 0;
 384         var->vmode = FB_VMODE_NONINTERLACED;
 385
 386         info->fbops = &offb_ops;
 387         info->screen_base = ioremap(address, fix->smem_len);
 388         info->par = par;
 389         info->pseudo_palette = (void *) (info + 1);
 390         info->flags = FBINFO_DEFAULT;
 391
 392         fb_alloc_cmap(&info->cmap, 256, 0);
 393
 394         if (register_framebuffer(info) < 0) {
 395                 kfree(info);
 396                 release_mem_region(res_start, res_size);
 397                 return;
 398         }
 399
 400         printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
 401                info->node, full_name);
 402 }
 403
 404
 405 static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
 406 {
 407         unsigned int len;
 408         int i, width = 640, height = 480, depth = 8, pitch = 640;
 409         unsigned int flags, rsize, addr_prop = 0;
 410         unsigned long max_size = 0;
 411         u64 rstart, address = OF_BAD_ADDR;
 412         u32 *pp, *addrp, *up;
 413         u64 asize;
 414
 415         pp = (u32 *)get_property(dp, "linux,bootx-depth", &len);
 416         if (pp == NULL)
 417                 pp = (u32 *)get_property(dp, "depth", &len);
 418         if (pp && len == sizeof(u32))
 419                 depth = *pp;
 420
 421         pp = (u32 *)get_property(dp, "linux,bootx-width", &len);
 422         if (pp == NULL)
 423                 pp = (u32 *)get_property(dp, "width", &len);
 424         if (pp && len == sizeof(u32))
 425                 width = *pp;
 426
 427         pp = (u32 *)get_property(dp, "linux,bootx-height", &len);
 428         if (pp == NULL)
 429                 pp = (u32 *)get_property(dp, "height", &len);
 430         if (pp && len == sizeof(u32))
 431                 height = *pp;
 432
 433         pp = (u32 *)get_property(dp, "linux,bootx-linebytes", &len);
 434         if (pp == NULL)
 435                 pp = (u32 *)get_property(dp, "linebytes", &len);
 436         if (pp && len == sizeof(u32))
 437                 pitch = *pp;
 438         else
 439                 pitch = width * ((depth + 7) / 8);
 440
 441         rsize = (unsigned long)pitch * (unsigned long)height;
 442
 443         /* Ok, now we try to figure out the address of the framebuffer.
 444          *
 445          * Unfortunately, Open Firmware doesn't provide a standard way to do
 446          * so. All we can do is a dodgy heuristic that happens to work in
 447          * practice. On most machines, the "address" property contains what
 448          * we need, though not on Matrox cards found in IBM machines. What I've
 449          * found that appears to give good results is to go through the PCI
 450          * ranges and pick one that is both big enough and if possible encloses
 451          * the "address" property. If none match, we pick the biggest
 452          */
 453         up = (u32 *)get_property(dp, "linux,bootx-addr", &len);
 454         if (up == NULL)
 455                 up = (u32 *)get_property(dp, "address", &len);
 456         if (up && len == sizeof(u32))
 457                 addr_prop = *up;
 458
 459         /* Hack for when BootX is passing us */
 460         if (no_real_node)
 461                 goto skip_addr;
 462
 463         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
 464                      != NULL; i++) {
 465                 int match_addrp = 0;
 466
 467                 if (!(flags & IORESOURCE_MEM))
 468                         continue;
 469                 if (asize < rsize)
 470                         continue;
 471                 rstart = of_translate_address(dp, addrp);
 472                 if (rstart == OF_BAD_ADDR)
 473                         continue;
 474                 if (addr_prop && (rstart <= addr_prop) &&
 475                     ((rstart + asize) >= (addr_prop + rsize)))
 476                         match_addrp = 1;
 477                 if (match_addrp) {
 478                         address = addr_prop;
 479                         break;
 480                 }
 481                 if (rsize > max_size) {
 482                         max_size = rsize;
 483                         address = OF_BAD_ADDR;
 484                 }
 485
 486                 if (address == OF_BAD_ADDR)
 487                         address = rstart;
 488         }
 489  skip_addr:
 490         if (address == OF_BAD_ADDR && addr_prop)
 491                 address = (u64)addr_prop;
 492         if (address != OF_BAD_ADDR) {
 493                 /* kludge for valkyrie */
 494                 if (strcmp(dp->name, "valkyrie") == 0)
 495                         address += 0x1000;
 496                 offb_init_fb(no_real_node ? "bootx" : dp->name,
 497                              no_real_node ? "display" : dp->full_name,
 498                              width, height, depth, pitch, address,
 499                              no_real_node ? dp : NULL);
 500         }
 501 }
 502
 503 static int __init offb_init(void)
 504 {
 505         struct device_node *dp = NULL, *boot_disp = NULL;
 506
 507         if (fb_get_options("offb", NULL))
 508                 return -ENODEV;
 509
 510         /* Check if we have a MacOS display without a node spec */
 511         if (get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {
 512                 /* The old code tried to work out which node was the MacOS
 513                  * display based on the address. I'm dropping that since the
 514                  * lack of a node spec only happens with old BootX versions
 515                  * (users can update) and with this code, they'll still get
 516                  * a display (just not the palette hacks).
 517                  */
 518                 offb_init_nodriver(of_chosen, 1);
 519         }
 520
 521         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 522                 if (get_property(dp, "linux,opened", NULL) &&
 523                     get_property(dp, "linux,boot-display", NULL)) {
 524                         boot_disp = dp;
 525                         offb_init_nodriver(dp, 0);
 526                 }
 527         }
 528         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 529                 if (get_property(dp, "linux,opened", NULL) &&
 530                     dp != boot_disp)
 531                         offb_init_nodriver(dp, 0);
 532         }
 533
 534         return 0;
 535 }
 536
 537
 538 module_init(offb_init);
 539 MODULE_LICENSE("GPL");