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 <asm/io.h>
  30 #include <asm/prom.h>
  31
  32 #ifdef CONFIG_PPC32
  33 #include <asm/bootx.h>
  34 #endif
  35
  36 #include "macmodes.h"
  37
  38 /* Supported palette hacks */
  39 enum {
  40         cmap_unknown,
  41         cmap_m64,               /* ATI Mach64 */
  42         cmap_r128,              /* ATI Rage128 */
  43         cmap_M3A,               /* ATI Rage Mobility M3 Head A */
  44         cmap_M3B,               /* ATI Rage Mobility M3 Head B */
  45         cmap_radeon,            /* ATI Radeon */
  46         cmap_gxt2000,           /* IBM GXT2000 */
  47 };
  48
  49 struct offb_par {
  50         volatile void __iomem *cmap_adr;
  51         volatile void __iomem *cmap_data;
  52         int cmap_type;
  53         int blanked;
  54 };
  55
  56 struct offb_par default_par;
  57
  58     /*
  59      *  Interface used by the world
  60      */
  61
  62 int offb_init(void);
  63
  64 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  65                           u_int transp, struct fb_info *info);
  66 static int offb_blank(int blank, struct fb_info *info);
  67
  68 #ifdef CONFIG_PPC32
  69 extern boot_infos_t *boot_infos;
  70 #endif
  71
  72 static void offb_init_nodriver(struct device_node *);
  73 static void offb_init_fb(const char *name, const char *full_name,
  74                          int width, int height, int depth, int pitch,
  75                          unsigned long address, struct device_node *dp);
  76
  77 static struct fb_ops offb_ops = {
  78         .owner          = THIS_MODULE,
  79         .fb_setcolreg   = offb_setcolreg,
  80         .fb_blank       = offb_blank,
  81         .fb_fillrect    = cfb_fillrect,
  82         .fb_copyarea    = cfb_copyarea,
  83         .fb_imageblit   = cfb_imageblit,
  84         .fb_cursor      = soft_cursor,
  85 };
  86
  87     /*
  88      *  Set a single color register. The values supplied are already
  89      *  rounded down to the hardware's capabilities (according to the
  90      *  entries in the var structure). Return != 0 for invalid regno.
  91      */
  92
  93 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  94                           u_int transp, struct fb_info *info)
  95 {
  96         struct offb_par *par = (struct offb_par *) info->par;
  97
  98         if (!par->cmap_adr || regno > 255)
  99                 return 1;
 100
 101         red >>= 8;
 102         green >>= 8;
 103         blue >>= 8;
 104
 105         switch (par->cmap_type) {
 106         case cmap_m64:
 107                 writeb(regno, par->cmap_adr);
 108                 writeb(red, par->cmap_data);
 109                 writeb(green, par->cmap_data);
 110                 writeb(blue, par->cmap_data);
 111                 break;
 112         case cmap_M3A:
 113                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 114                 out_le32(par->cmap_adr + 0x58,
 115                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 116         case cmap_r128:
 117                 /* Set palette index & data */
 118                 out_8(par->cmap_adr + 0xb0, regno);
 119                 out_le32(par->cmap_adr + 0xb4,
 120                          (red << 16 | green << 8 | blue));
 121                 break;
 122         case cmap_M3B:
 123                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 124                 out_le32(par->cmap_adr + 0x58,
 125                          in_le32(par->cmap_adr + 0x58) | 0x20);
 126                 /* Set palette index & data */
 127                 out_8(par->cmap_adr + 0xb0, regno);
 128                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 129                 break;
 130         case cmap_radeon:
 131                 /* Set palette index & data (could be smarter) */
 132                 out_8(par->cmap_adr + 0xb0, regno);
 133                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 134                 break;
 135         case cmap_gxt2000:
 136                 out_le32((unsigned __iomem *) par->cmap_adr + regno,
 137                          (red << 16 | green << 8 | blue));
 138                 break;
 139         }
 140
 141         if (regno < 16)
 142                 switch (info->var.bits_per_pixel) {
 143                 case 16:
 144                         ((u16 *) (info->pseudo_palette))[regno] =
 145                             (regno << 10) | (regno << 5) | regno;
 146                         break;
 147                 case 32:
 148                         {
 149                                 int i = (regno << 8) | regno;
 150                                 ((u32 *) (info->pseudo_palette))[regno] =
 151                                     (i << 16) | i;
 152                                 break;
 153                         }
 154                 }
 155         return 0;
 156 }
 157
 158     /*
 159      *  Blank the display.
 160      */
 161
 162 static int offb_blank(int blank, struct fb_info *info)
 163 {
 164         struct offb_par *par = (struct offb_par *) info->par;
 165         int i, j;
 166
 167         if (!par->cmap_adr)
 168                 return 0;
 169
 170         if (!par->blanked)
 171                 if (!blank)
 172                         return 0;
 173
 174         par->blanked = blank;
 175
 176         if (blank)
 177                 for (i = 0; i < 256; i++) {
 178                         switch (par->cmap_type) {
 179                         case cmap_m64:
 180                                 writeb(i, par->cmap_adr);
 181                                 for (j = 0; j < 3; j++)
 182                                         writeb(0, par->cmap_data);
 183                                 break;
 184                         case cmap_M3A:
 185                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 186                                 out_le32(par->cmap_adr + 0x58,
 187                                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 188                         case cmap_r128:
 189                                 /* Set palette index & data */
 190                                 out_8(par->cmap_adr + 0xb0, i);
 191                                 out_le32(par->cmap_adr + 0xb4, 0);
 192                                 break;
 193                         case cmap_M3B:
 194                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 195                                 out_le32(par->cmap_adr + 0x58,
 196                                          in_le32(par->cmap_adr + 0x58) | 0x20);
 197                                 /* Set palette index & data */
 198                                 out_8(par->cmap_adr + 0xb0, i);
 199                                 out_le32(par->cmap_adr + 0xb4, 0);
 200                                 break;
 201                         case cmap_radeon:
 202                                 out_8(par->cmap_adr + 0xb0, i);
 203                                 out_le32(par->cmap_adr + 0xb4, 0);
 204                                 break;
 205                         case cmap_gxt2000:
 206                                 out_le32((unsigned __iomem *) par->cmap_adr + i,
 207                                          0);
 208                                 break;
 209                         }
 210         } else
 211                 fb_set_cmap(&info->cmap, info);
 212         return 0;
 213 }
 214
 215     /*
 216      *  Initialisation
 217      */
 218
 219 int __init offb_init(void)
 220 {
 221         struct device_node *dp = NULL, *boot_disp = NULL;
 222 #if defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32)
 223         struct device_node *macos_display = NULL;
 224 #endif
 225         if (fb_get_options("offb", NULL))
 226                 return -ENODEV;
 227
 228 #if defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32)
 229         /* If we're booted from BootX... */
 230         if (boot_infos != 0) {
 231                 unsigned long addr =
 232                     (unsigned long) boot_infos->dispDeviceBase;
 233                 /* find the device node corresponding to the macos display */
 234                 while ((dp = of_find_node_by_type(dp, "display"))) {
 235                         int i;
 236                         /*
 237                          * Grrr...  It looks like the MacOS ATI driver
 238                          * munges the assigned-addresses property (but
 239                          * the AAPL,address value is OK).
 240                          */
 241                         if (strncmp(dp->name, "ATY,", 4) == 0
 242                             && dp->n_addrs == 1) {
 243                                 unsigned int *ap =
 244                                     (unsigned int *) get_property(dp,
 245                                                                   "AAPL,address",
 246                                                                   NULL);
 247                                 if (ap != NULL) {
 248                                         dp->addrs[0].address = *ap;
 249                                         dp->addrs[0].size = 0x01000000;
 250                                 }
 251                         }
 252
 253                         /*
 254                          * The LTPro on the Lombard powerbook has no addresses
 255                          * on the display nodes, they are on their parent.
 256                          */
 257                         if (dp->n_addrs == 0
 258                             && device_is_compatible(dp, "ATY,264LTPro")) {
 259                                 int na;
 260                                 unsigned int *ap = (unsigned int *)
 261                                     get_property(dp, "AAPL,address", &na);
 262                                 if (ap != 0)
 263                                         for (na /= sizeof(unsigned int);
 264                                              na > 0; --na, ++ap)
 265                                                 if (*ap <= addr
 266                                                     && addr <
 267                                                     *ap + 0x1000000)
 268                                                         goto foundit;
 269                         }
 270
 271                         /*
 272                          * See if the display address is in one of the address
 273                          * ranges for this display.
 274                          */
 275                         for (i = 0; i < dp->n_addrs; ++i) {
 276                                 if (dp->addrs[i].address <= addr
 277                                     && addr <
 278                                     dp->addrs[i].address +
 279                                     dp->addrs[i].size)
 280                                         break;
 281                         }
 282                         if (i < dp->n_addrs) {
 283                               foundit:
 284                                 printk(KERN_INFO "MacOS display is %s\n",
 285                                        dp->full_name);
 286                                 macos_display = dp;
 287                                 break;
 288                         }
 289                 }
 290
 291                 /* initialize it */
 292                 offb_init_fb(macos_display ? macos_display->
 293                              name : "MacOS display",
 294                              macos_display ? macos_display->
 295                              full_name : "MacOS display",
 296                              boot_infos->dispDeviceRect[2],
 297                              boot_infos->dispDeviceRect[3],
 298                              boot_infos->dispDeviceDepth,
 299                              boot_infos->dispDeviceRowBytes, addr, NULL);
 300         }
 301 #endif /* defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32) */
 302
 303         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 304                 if (get_property(dp, "linux,opened", NULL) &&
 305                     get_property(dp, "linux,boot-display", NULL)) {
 306                         boot_disp = dp;
 307                         offb_init_nodriver(dp);
 308                 }
 309         }
 310         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 311                 if (get_property(dp, "linux,opened", NULL) &&
 312                     dp != boot_disp)
 313                         offb_init_nodriver(dp);
 314         }
 315
 316         return 0;
 317 }
 318
 319
 320 static void __init offb_init_nodriver(struct device_node *dp)
 321 {
 322         int *pp, i;
 323         unsigned int len;
 324         int width = 640, height = 480, depth = 8, pitch;
 325         unsigned *up, address;
 326
 327         if ((pp = (int *) get_property(dp, "depth", &len)) != NULL
 328             && len == sizeof(int))
 329                 depth = *pp;
 330         if ((pp = (int *) get_property(dp, "width", &len)) != NULL
 331             && len == sizeof(int))
 332                 width = *pp;
 333         if ((pp = (int *) get_property(dp, "height", &len)) != NULL
 334             && len == sizeof(int))
 335                 height = *pp;
 336         if ((pp = (int *) get_property(dp, "linebytes", &len)) != NULL
 337             && len == sizeof(int)) {
 338                 pitch = *pp;
 339                 if (pitch == 1)
 340                         pitch = 0x1000;
 341         } else
 342                 pitch = width;
 343         if ((up = (unsigned *) get_property(dp, "address", &len)) != NULL
 344             && len == sizeof(unsigned))
 345                 address = (u_long) * up;
 346         else {
 347                 for (i = 0; i < dp->n_addrs; ++i)
 348                         if (dp->addrs[i].size >=
 349                             pitch * height * depth / 8)
 350                                 break;
 351                 if (i >= dp->n_addrs) {
 352                         printk(KERN_ERR
 353                                "no framebuffer address found for %s\n",
 354                                dp->full_name);
 355                         return;
 356                 }
 357
 358                 address = (u_long) dp->addrs[i].address;
 359
 360                 /* kludge for valkyrie */
 361                 if (strcmp(dp->name, "valkyrie") == 0)
 362                         address += 0x1000;
 363         }
 364         offb_init_fb(dp->name, dp->full_name, width, height, depth,
 365                      pitch, address, dp);
 366
 367 }
 368
 369 static void __init offb_init_fb(const char *name, const char *full_name,
 370                                 int width, int height, int depth,
 371                                 int pitch, unsigned long address,
 372                                 struct device_node *dp)
 373 {
 374         unsigned long res_size = pitch * height * depth / 8;
 375         struct offb_par *par = &default_par;
 376         unsigned long res_start = address;
 377         struct fb_fix_screeninfo *fix;
 378         struct fb_var_screeninfo *var;
 379         struct fb_info *info;
 380         int size;
 381
 382         if (!request_mem_region(res_start, res_size, "offb"))
 383                 return;
 384
 385         printk(KERN_INFO
 386                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 387                width, height, name, address, depth, pitch);
 388         if (depth != 8 && depth != 16 && depth != 32) {
 389                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
 390                        depth);
 391                 release_mem_region(res_start, res_size);
 392                 return;
 393         }
 394
 395         size = sizeof(struct fb_info) + sizeof(u32) * 17;
 396
 397         info = kmalloc(size, GFP_ATOMIC);
 398
 399         if (info == 0) {
 400                 release_mem_region(res_start, res_size);
 401                 return;
 402         }
 403         memset(info, 0, size);
 404
 405         fix = &info->fix;
 406         var = &info->var;
 407
 408         strcpy(fix->id, "OFfb ");
 409         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 410         fix->id[sizeof(fix->id) - 1] = '\0';
 411
 412         var->xres = var->xres_virtual = width;
 413         var->yres = var->yres_virtual = height;
 414         fix->line_length = pitch;
 415
 416         fix->smem_start = address;
 417         fix->smem_len = pitch * height;
 418         fix->type = FB_TYPE_PACKED_PIXELS;
 419         fix->type_aux = 0;
 420
 421         par->cmap_type = cmap_unknown;
 422         if (depth == 8) {
 423                 /* XXX kludge for ati */
 424                 if (dp && !strncmp(name, "ATY,Rage128", 11)) {
 425                         unsigned long regbase = dp->addrs[2].address;
 426                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 427                         par->cmap_type = cmap_r128;
 428                 } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
 429                                   || !strncmp(name, "ATY,RageM3p12A", 14))) {
 430                         unsigned long regbase =
 431                             dp->parent->addrs[2].address;
 432                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 433                         par->cmap_type = cmap_M3A;
 434                 } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
 435                         unsigned long regbase =
 436                             dp->parent->addrs[2].address;
 437                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 438                         par->cmap_type = cmap_M3B;
 439                 } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
 440                         unsigned long regbase = dp->addrs[1].address;
 441                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 442                         par->cmap_type = cmap_radeon;
 443                 } else if (!strncmp(name, "ATY,", 4)) {
 444                         unsigned long base = address & 0xff000000UL;
 445                         par->cmap_adr =
 446                             ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
 447                         par->cmap_data = par->cmap_adr + 1;
 448                         par->cmap_type = cmap_m64;
 449                 } else if (device_is_compatible(dp, "pci1014,b7")) {
 450                         unsigned long regbase = dp->addrs[0].address;
 451                         par->cmap_adr = ioremap(regbase + 0x6000, 0x1000);
 452                         par->cmap_type = cmap_gxt2000;
 453                 }
 454                 fix->visual = par->cmap_adr ? FB_VISUAL_PSEUDOCOLOR
 455                     : FB_VISUAL_STATIC_PSEUDOCOLOR;
 456         } else
 457                 fix->visual =   /* par->cmap_adr ? FB_VISUAL_DIRECTCOLOR
 458                                    : */ FB_VISUAL_TRUECOLOR;
 459
 460         var->xoffset = var->yoffset = 0;
 461         var->bits_per_pixel = depth;
 462         switch (depth) {
 463         case 8:
 464                 var->bits_per_pixel = 8;
 465                 var->red.offset = 0;
 466                 var->red.length = 8;
 467                 var->green.offset = 0;
 468                 var->green.length = 8;
 469                 var->blue.offset = 0;
 470                 var->blue.length = 8;
 471                 var->transp.offset = 0;
 472                 var->transp.length = 0;
 473                 break;
 474         case 16:                /* RGB 555 */
 475                 var->bits_per_pixel = 16;
 476                 var->red.offset = 10;
 477                 var->red.length = 5;
 478                 var->green.offset = 5;
 479                 var->green.length = 5;
 480                 var->blue.offset = 0;
 481                 var->blue.length = 5;
 482                 var->transp.offset = 0;
 483                 var->transp.length = 0;
 484                 break;
 485         case 32:                /* RGB 888 */
 486                 var->bits_per_pixel = 32;
 487                 var->red.offset = 16;
 488                 var->red.length = 8;
 489                 var->green.offset = 8;
 490                 var->green.length = 8;
 491                 var->blue.offset = 0;
 492                 var->blue.length = 8;
 493                 var->transp.offset = 24;
 494                 var->transp.length = 8;
 495                 break;
 496         }
 497         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 498             var->transp.msb_right = 0;
 499         var->grayscale = 0;
 500         var->nonstd = 0;
 501         var->activate = 0;
 502         var->height = var->width = -1;
 503         var->pixclock = 10000;
 504         var->left_margin = var->right_margin = 16;
 505         var->upper_margin = var->lower_margin = 16;
 506         var->hsync_len = var->vsync_len = 8;
 507         var->sync = 0;
 508         var->vmode = FB_VMODE_NONINTERLACED;
 509
 510         info->fbops = &offb_ops;
 511         info->screen_base = ioremap(address, fix->smem_len);
 512         info->par = par;
 513         info->pseudo_palette = (void *) (info + 1);
 514         info->flags = FBINFO_DEFAULT;
 515
 516         fb_alloc_cmap(&info->cmap, 256, 0);
 517
 518         if (register_framebuffer(info) < 0) {
 519                 kfree(info);
 520                 release_mem_region(res_start, res_size);
 521                 return;
 522         }
 523
 524         printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
 525                info->node, full_name);
 526 }
 527
 528 module_init(offb_init);
 529 MODULE_LICENSE("GPL");