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 int offb_init(void);
  66
  67 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  68                           u_int transp, struct fb_info *info);
  69 static int offb_blank(int blank, struct fb_info *info);
  70
  71 #ifdef CONFIG_PPC32
  72 extern boot_infos_t *boot_infos;
  73 #endif
  74
  75 static void offb_init_nodriver(struct device_node *);
  76 static void offb_init_fb(const char *name, const char *full_name,
  77                          int width, int height, int depth, int pitch,
  78                          unsigned long address, struct device_node *dp);
  79
  80 static struct fb_ops offb_ops = {
  81         .owner          = THIS_MODULE,
  82         .fb_setcolreg   = offb_setcolreg,
  83         .fb_blank       = offb_blank,
  84         .fb_fillrect    = cfb_fillrect,
  85         .fb_copyarea    = cfb_copyarea,
  86         .fb_imageblit   = cfb_imageblit,
  87 };
  88
  89     /*
  90      *  Set a single color register. The values supplied are already
  91      *  rounded down to the hardware's capabilities (according to the
  92      *  entries in the var structure). Return != 0 for invalid regno.
  93      */
  94
  95 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
  96                           u_int transp, struct fb_info *info)
  97 {
  98         struct offb_par *par = (struct offb_par *) info->par;
  99         int i, depth;
 100         u32 *pal = info->pseudo_palette;
 101
 102         depth = info->var.bits_per_pixel;
 103         if (depth == 16)
 104                 depth = (info->var.green.length == 5) ? 15 : 16;
 105
 106         if (regno > 255 ||
 107             (depth == 16 && regno > 63) ||
 108             (depth == 15 && regno > 31))
 109                 return 1;
 110
 111         if (regno < 16) {
 112                 switch (depth) {
 113                 case 15:
 114                         pal[regno] = (regno << 10) | (regno << 5) | regno;
 115                         break;
 116                 case 16:
 117                         pal[regno] = (regno << 11) | (regno << 5) | regno;
 118                         break;
 119                 case 24:
 120                         pal[regno] = (regno << 16) | (regno << 8) | regno;
 121                         break;
 122                 case 32:
 123                         i = (regno << 8) | regno;
 124                         pal[regno] = (i << 16) | i;
 125                         break;
 126                 }
 127         }
 128
 129         red >>= 8;
 130         green >>= 8;
 131         blue >>= 8;
 132
 133         if (!par->cmap_adr)
 134                 return 0;
 135
 136         switch (par->cmap_type) {
 137         case cmap_m64:
 138                 writeb(regno, par->cmap_adr);
 139                 writeb(red, par->cmap_data);
 140                 writeb(green, par->cmap_data);
 141                 writeb(blue, par->cmap_data);
 142                 break;
 143         case cmap_M3A:
 144                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 145                 out_le32(par->cmap_adr + 0x58,
 146                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 147         case cmap_r128:
 148                 /* Set palette index & data */
 149                 out_8(par->cmap_adr + 0xb0, regno);
 150                 out_le32(par->cmap_adr + 0xb4,
 151                          (red << 16 | green << 8 | blue));
 152                 break;
 153         case cmap_M3B:
 154                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 155                 out_le32(par->cmap_adr + 0x58,
 156                          in_le32(par->cmap_adr + 0x58) | 0x20);
 157                 /* Set palette index & data */
 158                 out_8(par->cmap_adr + 0xb0, regno);
 159                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 160                 break;
 161         case cmap_radeon:
 162                 /* Set palette index & data (could be smarter) */
 163                 out_8(par->cmap_adr + 0xb0, regno);
 164                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
 165                 break;
 166         case cmap_gxt2000:
 167                 out_le32((unsigned __iomem *) par->cmap_adr + regno,
 168                          (red << 16 | green << 8 | blue));
 169                 break;
 170         }
 171
 172         return 0;
 173 }
 174
 175     /*
 176      *  Blank the display.
 177      */
 178
 179 static int offb_blank(int blank, struct fb_info *info)
 180 {
 181         struct offb_par *par = (struct offb_par *) info->par;
 182         int i, j;
 183
 184         if (!par->cmap_adr)
 185                 return 0;
 186
 187         if (!par->blanked)
 188                 if (!blank)
 189                         return 0;
 190
 191         par->blanked = blank;
 192
 193         if (blank)
 194                 for (i = 0; i < 256; i++) {
 195                         switch (par->cmap_type) {
 196                         case cmap_m64:
 197                                 writeb(i, par->cmap_adr);
 198                                 for (j = 0; j < 3; j++)
 199                                         writeb(0, par->cmap_data);
 200                                 break;
 201                         case cmap_M3A:
 202                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
 203                                 out_le32(par->cmap_adr + 0x58,
 204                                          in_le32(par->cmap_adr + 0x58) & ~0x20);
 205                         case cmap_r128:
 206                                 /* Set palette index & data */
 207                                 out_8(par->cmap_adr + 0xb0, i);
 208                                 out_le32(par->cmap_adr + 0xb4, 0);
 209                                 break;
 210                         case cmap_M3B:
 211                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
 212                                 out_le32(par->cmap_adr + 0x58,
 213                                          in_le32(par->cmap_adr + 0x58) | 0x20);
 214                                 /* Set palette index & data */
 215                                 out_8(par->cmap_adr + 0xb0, i);
 216                                 out_le32(par->cmap_adr + 0xb4, 0);
 217                                 break;
 218                         case cmap_radeon:
 219                                 out_8(par->cmap_adr + 0xb0, i);
 220                                 out_le32(par->cmap_adr + 0xb4, 0);
 221                                 break;
 222                         case cmap_gxt2000:
 223                                 out_le32((unsigned __iomem *) par->cmap_adr + i,
 224                                          0);
 225                                 break;
 226                         }
 227         } else
 228                 fb_set_cmap(&info->cmap, info);
 229         return 0;
 230 }
 231
 232     /*
 233      *  Initialisation
 234      */
 235
 236 int __init offb_init(void)
 237 {
 238         struct device_node *dp = NULL, *boot_disp = NULL;
 239
 240         if (fb_get_options("offb", NULL))
 241                 return -ENODEV;
 242
 243         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 244                 if (get_property(dp, "linux,opened", NULL) &&
 245                     get_property(dp, "linux,boot-display", NULL)) {
 246                         boot_disp = dp;
 247                         offb_init_nodriver(dp);
 248                 }
 249         }
 250         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
 251                 if (get_property(dp, "linux,opened", NULL) &&
 252                     dp != boot_disp)
 253                         offb_init_nodriver(dp);
 254         }
 255
 256         return 0;
 257 }
 258
 259
 260 static void __init offb_init_nodriver(struct device_node *dp)
 261 {
 262         unsigned int len;
 263         int i, width = 640, height = 480, depth = 8, pitch = 640;
 264         unsigned int flags, rsize, addr_prop = 0;
 265         unsigned long max_size = 0;
 266         u64 rstart, address = OF_BAD_ADDR;
 267         u32 *pp, *addrp, *up;
 268         u64 asize;
 269
 270         pp = (u32 *)get_property(dp, "linux,bootx-depth", &len);
 271         if (pp == NULL)
 272                 pp = (u32 *)get_property(dp, "depth", &len);
 273         if (pp && len == sizeof(u32))
 274                 depth = *pp;
 275
 276         pp = (u32 *)get_property(dp, "linux,bootx-width", &len);
 277         if (pp == NULL)
 278                 pp = (u32 *)get_property(dp, "width", &len);
 279         if (pp && len == sizeof(u32))
 280                 width = *pp;
 281
 282         pp = (u32 *)get_property(dp, "linux,bootx-height", &len);
 283         if (pp == NULL)
 284                 pp = (u32 *)get_property(dp, "height", &len);
 285         if (pp && len == sizeof(u32))
 286                 height = *pp;
 287
 288         pp = (u32 *)get_property(dp, "linux,bootx-linebytes", &len);
 289         if (pp == NULL)
 290                 pp = (u32 *)get_property(dp, "linebytes", &len);
 291         if (pp && len == sizeof(u32))
 292                 pitch = *pp;
 293         else
 294                 pitch = width * ((depth + 7) / 8);
 295
 296         rsize = (unsigned long)pitch * (unsigned long)height;
 297
 298         /* Ok, now we try to figure out the address of the framebuffer.
 299          *
 300          * Unfortunately, Open Firmware doesn't provide a standard way to do
 301          * so. All we can do is a dodgy heuristic that happens to work in
 302          * practice. On most machines, the "address" property contains what
 303          * we need, though not on Matrox cards found in IBM machines. What I've
 304          * found that appears to give good results is to go through the PCI
 305          * ranges and pick one that is both big enough and if possible encloses
 306          * the "address" property. If none match, we pick the biggest
 307          */
 308         up = (u32 *)get_property(dp, "linux,bootx-addr", &len);
 309         if (up == NULL)
 310                 up = (u32 *)get_property(dp, "address", &len);
 311         if (up && len == sizeof(u32))
 312                 addr_prop = *up;
 313
 314         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
 315                      != NULL; i++) {
 316                 int match_addrp = 0;
 317
 318                 if (!(flags & IORESOURCE_MEM))
 319                         continue;
 320                 if (asize < rsize)
 321                         continue;
 322                 rstart = of_translate_address(dp, addrp);
 323                 if (rstart == OF_BAD_ADDR)
 324                         continue;
 325                 if (addr_prop && (rstart <= addr_prop) &&
 326                     ((rstart + asize) >= (addr_prop + rsize)))
 327                         match_addrp = 1;
 328                 if (match_addrp) {
 329                         address = addr_prop;
 330                         break;
 331                 }
 332                 if (rsize > max_size) {
 333                         max_size = rsize;
 334                         address = OF_BAD_ADDR;
 335                 }
 336
 337                 if (address == OF_BAD_ADDR)
 338                         address = rstart;
 339         }
 340         if (address == OF_BAD_ADDR && addr_prop)
 341                 address = (u64)addr_prop;
 342         if (address != OF_BAD_ADDR) {
 343                 /* kludge for valkyrie */
 344                 if (strcmp(dp->name, "valkyrie") == 0)
 345                         address += 0x1000;
 346                 offb_init_fb(dp->name, dp->full_name, width, height, depth,
 347                              pitch, address, dp);
 348         }
 349 }
 350
 351 static void __init offb_init_fb(const char *name, const char *full_name,
 352                                 int width, int height, int depth,
 353                                 int pitch, unsigned long address,
 354                                 struct device_node *dp)
 355 {
 356         unsigned long res_size = pitch * height * (depth + 7) / 8;
 357         struct offb_par *par = &default_par;
 358         unsigned long res_start = address;
 359         struct fb_fix_screeninfo *fix;
 360         struct fb_var_screeninfo *var;
 361         struct fb_info *info;
 362         int size;
 363
 364         if (!request_mem_region(res_start, res_size, "offb"))
 365                 return;
 366
 367         printk(KERN_INFO
 368                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
 369                width, height, name, address, depth, pitch);
 370         if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
 371                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
 372                        depth);
 373                 release_mem_region(res_start, res_size);
 374                 return;
 375         }
 376
 377         size = sizeof(struct fb_info) + sizeof(u32) * 17;
 378
 379         info = kmalloc(size, GFP_ATOMIC);
 380
 381         if (info == 0) {
 382                 release_mem_region(res_start, res_size);
 383                 return;
 384         }
 385         memset(info, 0, size);
 386
 387         fix = &info->fix;
 388         var = &info->var;
 389
 390         strcpy(fix->id, "OFfb ");
 391         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
 392         fix->id[sizeof(fix->id) - 1] = '\0';
 393
 394         var->xres = var->xres_virtual = width;
 395         var->yres = var->yres_virtual = height;
 396         fix->line_length = pitch;
 397
 398         fix->smem_start = address;
 399         fix->smem_len = pitch * height;
 400         fix->type = FB_TYPE_PACKED_PIXELS;
 401         fix->type_aux = 0;
 402
 403         par->cmap_type = cmap_unknown;
 404         if (depth == 8) {
 405
 406                 /* Palette hacks disabled for now */
 407 #if 0
 408                 if (dp && !strncmp(name, "ATY,Rage128", 11)) {
 409                         unsigned long regbase = dp->addrs[2].address;
 410                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 411                         par->cmap_type = cmap_r128;
 412                 } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
 413                                   || !strncmp(name, "ATY,RageM3p12A", 14))) {
 414                         unsigned long regbase =
 415                             dp->parent->addrs[2].address;
 416                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 417                         par->cmap_type = cmap_M3A;
 418                 } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
 419                         unsigned long regbase =
 420                             dp->parent->addrs[2].address;
 421                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 422                         par->cmap_type = cmap_M3B;
 423                 } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
 424                         unsigned long regbase = dp->addrs[1].address;
 425                         par->cmap_adr = ioremap(regbase, 0x1FFF);
 426                         par->cmap_type = cmap_radeon;
 427                 } else if (!strncmp(name, "ATY,", 4)) {
 428                         unsigned long base = address & 0xff000000UL;
 429                         par->cmap_adr =
 430                             ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
 431                         par->cmap_data = par->cmap_adr + 1;
 432                         par->cmap_type = cmap_m64;
 433                 } else if (device_is_compatible(dp, "pci1014,b7")) {
 434                         unsigned long regbase = dp->addrs[0].address;
 435                         par->cmap_adr = ioremap(regbase + 0x6000, 0x1000);
 436                         par->cmap_type = cmap_gxt2000;
 437                 }
 438 #endif
 439                 fix->visual = par->cmap_adr ? FB_VISUAL_PSEUDOCOLOR
 440                     : FB_VISUAL_STATIC_PSEUDOCOLOR;
 441         } else
 442                 fix->visual =   /* par->cmap_adr ? FB_VISUAL_DIRECTCOLOR
 443                                    : */ FB_VISUAL_TRUECOLOR;
 444
 445         var->xoffset = var->yoffset = 0;
 446         switch (depth) {
 447         case 8:
 448                 var->bits_per_pixel = 8;
 449                 var->red.offset = 0;
 450                 var->red.length = 8;
 451                 var->green.offset = 0;
 452                 var->green.length = 8;
 453                 var->blue.offset = 0;
 454                 var->blue.length = 8;
 455                 var->transp.offset = 0;
 456                 var->transp.length = 0;
 457                 break;
 458         case 15:                /* RGB 555 */
 459                 var->bits_per_pixel = 16;
 460                 var->red.offset = 10;
 461                 var->red.length = 5;
 462                 var->green.offset = 5;
 463                 var->green.length = 5;
 464                 var->blue.offset = 0;
 465                 var->blue.length = 5;
 466                 var->transp.offset = 0;
 467                 var->transp.length = 0;
 468                 break;
 469         case 16:                /* RGB 565 */
 470                 var->bits_per_pixel = 16;
 471                 var->red.offset = 11;
 472                 var->red.length = 5;
 473                 var->green.offset = 5;
 474                 var->green.length = 6;
 475                 var->blue.offset = 0;
 476                 var->blue.length = 5;
 477                 var->transp.offset = 0;
 478                 var->transp.length = 0;
 479                 break;
 480         case 32:                /* RGB 888 */
 481                 var->bits_per_pixel = 32;
 482                 var->red.offset = 16;
 483                 var->red.length = 8;
 484                 var->green.offset = 8;
 485                 var->green.length = 8;
 486                 var->blue.offset = 0;
 487                 var->blue.length = 8;
 488                 var->transp.offset = 24;
 489                 var->transp.length = 8;
 490                 break;
 491         }
 492         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
 493             var->transp.msb_right = 0;
 494         var->grayscale = 0;
 495         var->nonstd = 0;
 496         var->activate = 0;
 497         var->height = var->width = -1;
 498         var->pixclock = 10000;
 499         var->left_margin = var->right_margin = 16;
 500         var->upper_margin = var->lower_margin = 16;
 501         var->hsync_len = var->vsync_len = 8;
 502         var->sync = 0;
 503         var->vmode = FB_VMODE_NONINTERLACED;
 504
 505         info->fbops = &offb_ops;
 506         info->screen_base = ioremap(address, fix->smem_len);
 507         info->par = par;
 508         info->pseudo_palette = (void *) (info + 1);
 509         info->flags = FBINFO_DEFAULT;
 510
 511         fb_alloc_cmap(&info->cmap, 256, 0);
 512
 513         if (register_framebuffer(info) < 0) {
 514                 kfree(info);
 515                 release_mem_region(res_start, res_size);
 516                 return;
 517         }
 518
 519         printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
 520                info->node, full_name);
 521 }
 522
 523 module_init(offb_init);
 524 MODULE_LICENSE("GPL");