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 int offb_init(void);
  67
  68 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  69                           u_int transp, struct fb_info *info);
  70 static int offb_blank(int blank, struct fb_info *info);
  71
  72 #ifdef CONFIG_PPC32
  73 extern boot_infos_t *boot_infos;
  74 #endif
  75
  76 static void offb_init_nodriver(struct device_node *);
  77 static void offb_init_fb(const char *name, const char *full_name,
  78                          int width, int height, int depth, int pitch,
  79                          unsigned long address, struct device_node *dp);
  80
  81 static struct fb_ops offb_ops = {
  82         .owner          = THIS_MODULE,
  83         .fb_setcolreg   = offb_setcolreg,
  84         .fb_blank       = offb_blank,
  85         .fb_fillrect    = cfb_fillrect,
  86         .fb_copyarea    = cfb_copyarea,
  87         .fb_imageblit   = cfb_imageblit,
  88 };
  89
  90     /*
  91      *  Set a single color register. The values supplied are already
  92      *  rounded down to the hardware's capabilities (according to the
  93      *  entries in the var structure). Return != 0 for invalid regno.
  94      */
  95
  96 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  97                           u_int transp, struct fb_info *info)
  98 {
  99         struct offb_par *par = (struct offb_par *) info->par;
 100         int i, depth;
 101         u32 *pal = info->pseudo_palette;
 102
 103         depth = info->var.bits_per_pixel;
 104         if (depth == 16)
 105                 depth = (info->var.green.length == 5) ? 15 : 16;
 106
 107         if (regno > 255 ||
 108             (depth == 16 && regno > 63) ||
 109             (depth == 15 && regno > 31))
 110                 return 1;
 111
 112         if (regno < 16) {
 113                 switch (depth) {
 114                 case 15:
 115                         pal[regno] = (regno << 10) | (regno << 5) | regno;
 116                         break;
 117                 case 16:
 118                         pal[regno] = (regno << 11) | (regno << 5) | regno;
 119                         break;
 120                 case 24:
 121                         pal[regno] = (regno << 16) | (regno << 8) | regno;
 122                         break;
 123                 case 32:
 124                         i = (regno << 8) | regno;
 125                         pal[regno] = (i << 16) | i;
 126                         break;
 127                 }
 128         }
 129
 130         red >>= 8;
 131         green >>= 8;
 132         blue >>= 8;
 133
 134         if (!par->cmap_adr)
 135                 return 0;
 136
 137         switch (par->cmap_type) {
 138         case cmap_m64:
 139                 writeb(regno, par->cmap_adr);
 140                 writeb(red, par->cmap_data);
 141                 writeb(green, par->cmap_data);
 142                 writeb(blue, par->cmap_data);
 143                 break;
 144         case cmap_M3A:
 145                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 146                 out_le32(par->cmap_adr + 0x58,
 147                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 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         }
 172
 173         return 0;
 174 }
 175
 176     /*
 177      *  Blank the display.
 178      */
 179
 180 static int offb_blank(int blank, struct fb_info *info)
 181 {
 182         struct offb_par *par = (struct offb_par *) info->par;
 183         int i, j;
 184
 185         if (!par->cmap_adr)
 186                 return 0;
 187
 188         if (!par->blanked)
 189                 if (!blank)
 190                         return 0;
 191
 192         par->blanked = blank;
 193
 194         if (blank)
 195                 for (i = 0; i < 256; i++) {
 196                         switch (par->cmap_type) {
 197                         case cmap_m64:
 198                                 writeb(i, par->cmap_adr);
 199                                 for (j = 0; j < 3; j++)
 200                                         writeb(0, par->cmap_data);
 201                                 break;
 202                         case cmap_M3A:
 203                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 204                                 out_le32(par->cmap_adr + 0x58,
 205                                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 206                         case cmap_r128:
 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_M3B:
 212                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 213                                 out_le32(par->cmap_adr + 0x58,
 214                                          in_le32(par->cmap_adr + 0x58) | 0x20);
 215                                 /* Set palette index & data */
 216                                 out_8(par->cmap_adr + 0xb0, i);
 217                                 out_le32(par->cmap_adr + 0xb4, 0);
 218                                 break;
 219                         case cmap_radeon:
 220                                 out_8(par->cmap_adr + 0xb0, i);
 221                                 out_le32(par->cmap_adr + 0xb4, 0);
 222                                 break;
 223                         case cmap_gxt2000:
 224                                 out_le32((unsigned __iomem *) par->cmap_adr + i,
 225                                          0);
 226                                 break;
 227                         }
 228         } else
 229                 fb_set_cmap(&info->cmap, info);
 230         return 0;
 231 }
 232
 233     /*
 234      *  Initialisation
 235      */
 236
 237 int __init offb_init(void)
 238 {
 239         struct device_node *dp = NULL, *boot_disp = NULL;
 240
 241         if (fb_get_options("offb", NULL))
 242                 return -ENODEV;
 243
 244         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 245                 if (get_property(dp, "linux,opened", NULL) &&
 246                     get_property(dp, "linux,boot-display", NULL)) {
 247                         boot_disp = dp;
 248                         offb_init_nodriver(dp);
 249                 }
 250         }
 251         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 252                 if (get_property(dp, "linux,opened", NULL) &&
 253                     dp != boot_disp)
 254                         offb_init_nodriver(dp);
 255         }
 256
 257         return 0;
 258 }
 259
 260
 261 static void __init offb_init_nodriver(struct device_node *dp)
 262 {
 263         unsigned int len;
 264         int i, width = 640, height = 480, depth = 8, pitch = 640;
 265         unsigned int flags, rsize, addr_prop = 0;
 266         unsigned long max_size = 0;
 267         u64 rstart, address = OF_BAD_ADDR;
 268         u32 *pp, *addrp, *up;
 269         u64 asize;
 270
 271         pp = (u32 *)get_property(dp, "linux,bootx-depth", &len);
 272         if (pp == NULL)
 273                 pp = (u32 *)get_property(dp, "depth", &len);
 274         if (pp && len == sizeof(u32))
 275                 depth = *pp;
 276
 277         pp = (u32 *)get_property(dp, "linux,bootx-width", &len);
 278         if (pp == NULL)
 279                 pp = (u32 *)get_property(dp, "width", &len);
 280         if (pp && len == sizeof(u32))
 281                 width = *pp;
 282
 283         pp = (u32 *)get_property(dp, "linux,bootx-height", &len);
 284         if (pp == NULL)
 285                 pp = (u32 *)get_property(dp, "height", &len);
 286         if (pp && len == sizeof(u32))
 287                 height = *pp;
 288
 289         pp = (u32 *)get_property(dp, "linux,bootx-linebytes", &len);
 290         if (pp == NULL)
 291                 pp = (u32 *)get_property(dp, "linebytes", &len);
 292         if (pp && len == sizeof(u32))
 293                 pitch = *pp;
 294         else
 295                 pitch = width * ((depth + 7) / 8);
 296
 297         rsize = (unsigned long)pitch * (unsigned long)height;
 298
 299         /* Ok, now we try to figure out the address of the framebuffer.
 300          *
 301          * Unfortunately, Open Firmware doesn't provide a standard way to do
 302          * so. All we can do is a dodgy heuristic that happens to work in
 303          * practice. On most machines, the "address" property contains what
 304          * we need, though not on Matrox cards found in IBM machines. What I've
 305          * found that appears to give good results is to go through the PCI
 306          * ranges and pick one that is both big enough and if possible encloses
 307          * the "address" property. If none match, we pick the biggest
 308          */
 309         up = (u32 *)get_property(dp, "linux,bootx-addr", &len);
 310         if (up == NULL)
 311                 up = (u32 *)get_property(dp, "address", &len);
 312         if (up && len == sizeof(u32))
 313                 addr_prop = *up;
 314
 315         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
 316                      != NULL; i++) {
 317                 int match_addrp = 0;
 318
 319                 if (!(flags & IORESOURCE_MEM))
 320                         continue;
 321                 if (asize < rsize)
 322                         continue;
 323                 rstart = of_translate_address(dp, addrp);
 324                 if (rstart == OF_BAD_ADDR)
 325                         continue;
 326                 if (addr_prop && (rstart <= addr_prop) &&
 327                     ((rstart + asize) >= (addr_prop + rsize)))
 328                         match_addrp = 1;
 329                 if (match_addrp) {
 330                         address = addr_prop;
 331                         break;
 332                 }
 333                 if (rsize > max_size) {
 334                         max_size = rsize;
 335                         address = OF_BAD_ADDR;
 336                 }
 337
 338                 if (address == OF_BAD_ADDR)
 339                         address = rstart;
 340         }
 341         if (address == OF_BAD_ADDR && addr_prop)
 342                 address = (u64)addr_prop;
 343         if (address != OF_BAD_ADDR) {
 344                 /* kludge for valkyrie */
 345                 if (strcmp(dp->name, "valkyrie") == 0)
 346                         address += 0x1000;
 347                 offb_init_fb(dp->name, dp->full_name, width, height, depth,
 348                              pitch, address, dp);
 349         }
 350 }
 351
 352 static void __init offb_init_fb(const char *name, const char *full_name,
 353                                 int width, int height, int depth,
 354                                 int pitch, unsigned long address,
 355                                 struct device_node *dp)
 356 {
 357         unsigned long res_size = pitch * height * (depth + 7) / 8;
 358         struct offb_par *par = &default_par;
 359         unsigned long res_start = address;
 360         struct fb_fix_screeninfo *fix;
 361         struct fb_var_screeninfo *var;
 362         struct fb_info *info;
 363         int size;
 364
 365         if (!request_mem_region(res_start, res_size, "offb"))
 366                 return;
 367
 368         printk(KERN_INFO
 369                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 370                width, height, name, address, depth, pitch);
 371         if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
 372                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
 373                        depth);
 374                 release_mem_region(res_start, res_size);
 375                 return;
 376         }
 377
 378         size = sizeof(struct fb_info) + sizeof(u32) * 17;
 379
 380         info = kmalloc(size, GFP_ATOMIC);
 381
 382         if (info == 0) {
 383                 release_mem_region(res_start, res_size);
 384                 return;
 385         }
 386         memset(info, 0, size);
 387
 388         fix = &info->fix;
 389         var = &info->var;
 390
 391         strcpy(fix->id, "OFfb ");
 392         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 393         fix->id[sizeof(fix->id) - 1] = '\0';
 394
 395         var->xres = var->xres_virtual = width;
 396         var->yres = var->yres_virtual = height;
 397         fix->line_length = pitch;
 398
 399         fix->smem_start = address;
 400         fix->smem_len = pitch * height;
 401         fix->type = FB_TYPE_PACKED_PIXELS;
 402         fix->type_aux = 0;
 403
 404         par->cmap_type = cmap_unknown;
 405         if (depth == 8) {
 406
 407                 /* Palette hacks disabled for now */
 408 #if 0
 409                 if (dp && !strncmp(name, "ATY,Rage128", 11)) {
 410                         unsigned long regbase = dp->addrs[2].address;
 411                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 412                         par->cmap_type = cmap_r128;
 413                 } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
 414                                   || !strncmp(name, "ATY,RageM3p12A", 14))) {
 415                         unsigned long regbase =
 416                             dp->parent->addrs[2].address;
 417                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 418                         par->cmap_type = cmap_M3A;
 419                 } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
 420                         unsigned long regbase =
 421                             dp->parent->addrs[2].address;
 422                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 423                         par->cmap_type = cmap_M3B;
 424                 } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
 425                         unsigned long regbase = dp->addrs[1].address;
 426                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 427                         par->cmap_type = cmap_radeon;
 428                 } else if (!strncmp(name, "ATY,", 4)) {
 429                         unsigned long base = address & 0xff000000UL;
 430                         par->cmap_adr =
 431                             ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
 432                         par->cmap_data = par->cmap_adr + 1;
 433                         par->cmap_type = cmap_m64;
 434                 } else if (device_is_compatible(dp, "pci1014,b7")) {
 435                         unsigned long regbase = dp->addrs[0].address;
 436                         par->cmap_adr = ioremap(regbase + 0x6000, 0x1000);
 437                         par->cmap_type = cmap_gxt2000;
 438                 }
 439 #endif
 440                 fix->visual = par->cmap_adr ? FB_VISUAL_PSEUDOCOLOR
 441                     : FB_VISUAL_STATIC_PSEUDOCOLOR;
 442         } else
 443                 fix->visual =   /* par->cmap_adr ? FB_VISUAL_DIRECTCOLOR
 444                                    : */ 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         info->fbops = &offb_ops;
 507         info->screen_base = ioremap(address, fix->smem_len);
 508         info->par = par;
 509         info->pseudo_palette = (void *) (info + 1);
 510         info->flags = FBINFO_DEFAULT;
 511
 512         fb_alloc_cmap(&info->cmap, 256, 0);
 513
 514         if (register_framebuffer(info) < 0) {
 515                 kfree(info);
 516                 release_mem_region(res_start, res_size);
 517                 return;
 518         }
 519
 520         printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
 521                info->node, full_name);
 522 }
 523
 524 module_init(offb_init);
 525 MODULE_LICENSE("GPL");