git.oblomov.eu Git - linux-2.6/blob - drivers/video/console/newport_con.c

   1 /*
   2  * newport_con.c: Abscon for newport hardware
   3  *
   4  * (C) 1998 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
   5  * (C) 1999 Ulf Carlsson (ulfc@thepuffingruop.com)
   6  *
   7  * This driver is based on sgicons.c and cons_newport.
   8  *
   9  * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
  10  * Copyright (C) 1997 Miguel de Icaza (miguel@nuclecu.unam.mx)
  11  */
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/errno.h>
  15 #include <linux/kd.h>
  16 #include <linux/selection.h>
  17 #include <linux/console.h>
  18 #include <linux/vt_kern.h>
  19 #include <linux/mm.h>
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22
  23 #include <asm/io.h>
  24 #include <asm/uaccess.h>
  25 #include <asm/system.h>
  26 #include <asm/page.h>
  27 #include <asm/pgtable.h>
  28 #include <video/newport.h>
  29
  30 #include <linux/linux_logo.h>
  31 #include <linux/font.h>
  32
  33
  34 extern unsigned long sgi_gfxaddr;
  35
  36 #define FONT_DATA ((unsigned char *)font_vga_8x16.data)
  37
  38 /* borrowed from fbcon.c */
  39 #define REFCOUNT(fd)    (((int *)(fd))[-1])
  40 #define FNTSIZE(fd)     (((int *)(fd))[-2])
  41 #define FNTCHARCNT(fd)  (((int *)(fd))[-3])
  42 #define FONT_EXTRA_WORDS 3
  43
  44 static unsigned char *font_data[MAX_NR_CONSOLES];
  45
  46 static struct newport_regs *npregs;
  47
  48 static int logo_active;
  49 static int topscan;
  50 static int xcurs_correction = 29;
  51 static int newport_xsize;
  52 static int newport_ysize;
  53 static int newport_has_init;
  54
  55 static int newport_set_def_font(int unit, struct console_font *op);
  56
  57 #define BMASK(c) (c << 24)
  58
  59 #define RENDER(regs, cp) do { \
  60 (regs)->go.zpattern = BMASK((cp)[0x0]); (regs)->go.zpattern = BMASK((cp)[0x1]); \
  61 (regs)->go.zpattern = BMASK((cp)[0x2]); (regs)->go.zpattern = BMASK((cp)[0x3]); \
  62 (regs)->go.zpattern = BMASK((cp)[0x4]); (regs)->go.zpattern = BMASK((cp)[0x5]); \
  63 (regs)->go.zpattern = BMASK((cp)[0x6]); (regs)->go.zpattern = BMASK((cp)[0x7]); \
  64 (regs)->go.zpattern = BMASK((cp)[0x8]); (regs)->go.zpattern = BMASK((cp)[0x9]); \
  65 (regs)->go.zpattern = BMASK((cp)[0xa]); (regs)->go.zpattern = BMASK((cp)[0xb]); \
  66 (regs)->go.zpattern = BMASK((cp)[0xc]); (regs)->go.zpattern = BMASK((cp)[0xd]); \
  67 (regs)->go.zpattern = BMASK((cp)[0xe]); (regs)->go.zpattern = BMASK((cp)[0xf]); \
  68 } while(0)
  69
  70 #define TESTVAL 0xdeadbeef
  71 #define XSTI_TO_FXSTART(val) (((val) & 0xffff) << 11)
  72
  73 static inline void newport_render_background(int xstart, int ystart,
  74                                              int xend, int yend, int ci)
  75 {
  76         newport_wait(npregs);
  77         npregs->set.wrmask = 0xffffffff;
  78         npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
  79                                  NPORT_DMODE0_DOSETUP | NPORT_DMODE0_STOPX
  80                                  | NPORT_DMODE0_STOPY);
  81         npregs->set.colori = ci;
  82         npregs->set.xystarti =
  83             (xstart << 16) | ((ystart + topscan) & 0x3ff);
  84         npregs->go.xyendi =
  85             ((xend + 7) << 16) | ((yend + topscan + 15) & 0x3ff);
  86 }
  87
  88 static inline void newport_init_cmap(void)
  89 {
  90         unsigned short i;
  91
  92         for (i = 0; i < 16; i++) {
  93                 newport_bfwait(npregs);
  94                 newport_cmap_setaddr(npregs, color_table[i]);
  95                 newport_cmap_setrgb(npregs,
  96                                     default_red[i],
  97                                     default_grn[i], default_blu[i]);
  98         }
  99 }
 100
 101 static void newport_show_logo(void)
 102 {
 103 #ifdef CONFIG_LOGO_SGI_CLUT224
 104         const struct linux_logo *logo = fb_find_logo(8);
 105         const unsigned char *clut = logo->clut;
 106         const unsigned char *data = logo->data;
 107         unsigned long i;
 108
 109         for (i = 0; i < logo->clutsize; i++) {
 110                 newport_bfwait(npregs);
 111                 newport_cmap_setaddr(npregs, i + 0x20);
 112                 newport_cmap_setrgb(npregs, clut[0], clut[1], clut[2]);
 113                 clut += 3;
 114         }
 115
 116         newport_wait(npregs);
 117         npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
 118                                  NPORT_DMODE0_CHOST);
 119
 120         npregs->set.xystarti = ((newport_xsize - logo->width) << 16) | (0);
 121         npregs->set.xyendi = ((newport_xsize - 1) << 16);
 122         newport_wait(npregs);
 123
 124         for (i = 0; i < logo->width*logo->height; i++)
 125                 npregs->go.hostrw0 = *data++ << 24;
 126 #endif /* CONFIG_LOGO_SGI_CLUT224 */
 127 }
 128
 129 static inline void newport_clear_screen(int xstart, int ystart, int xend,
 130                                         int yend, int ci)
 131 {
 132         if (logo_active)
 133                 return;
 134
 135         newport_wait(npregs);
 136         npregs->set.wrmask = 0xffffffff;
 137         npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
 138                                  NPORT_DMODE0_DOSETUP | NPORT_DMODE0_STOPX
 139                                  | NPORT_DMODE0_STOPY);
 140         npregs->set.colori = ci;
 141         npregs->set.xystarti = (xstart << 16) | ystart;
 142         npregs->go.xyendi = (xend << 16) | yend;
 143 }
 144
 145 static inline void newport_clear_lines(int ystart, int yend, int ci)
 146 {
 147         ystart = ((ystart << 4) + topscan) & 0x3ff;
 148         yend = ((yend << 4) + topscan + 15) & 0x3ff;
 149         newport_clear_screen(0, ystart, 1280 + 63, yend, ci);
 150 }
 151
 152 static void newport_reset(void)
 153 {
 154         unsigned short treg;
 155         int i;
 156
 157         newport_wait(npregs);
 158         treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
 159         newport_vc2_set(npregs, VC2_IREG_CONTROL,
 160                         (treg | VC2_CTRL_EVIDEO));
 161
 162         treg = newport_vc2_get(npregs, VC2_IREG_CENTRY);
 163         newport_vc2_set(npregs, VC2_IREG_RADDR, treg);
 164         npregs->set.dcbmode = (NPORT_DMODE_AVC2 | VC2_REGADDR_RAM |
 165                                NPORT_DMODE_W2 | VC2_PROTOCOL);
 166         for (i = 0; i < 128; i++) {
 167                 newport_bfwait(npregs);
 168                 if (i == 92 || i == 94)
 169                         npregs->set.dcbdata0.byshort.s1 = 0xff00;
 170                 else
 171                         npregs->set.dcbdata0.byshort.s1 = 0x0000;
 172         }
 173
 174         newport_init_cmap();
 175
 176         /* turn off popup plane */
 177         npregs->set.dcbmode = (DCB_XMAP0 | R_DCB_XMAP9_PROTOCOL |
 178                                XM9_CRS_CONFIG | NPORT_DMODE_W1);
 179         npregs->set.dcbdata0.bybytes.b3 &= ~XM9_PUPMODE;
 180         npregs->set.dcbmode = (DCB_XMAP1 | R_DCB_XMAP9_PROTOCOL |
 181                                XM9_CRS_CONFIG | NPORT_DMODE_W1);
 182         npregs->set.dcbdata0.bybytes.b3 &= ~XM9_PUPMODE;
 183
 184         topscan = 0;
 185         npregs->cset.topscan = 0x3ff;
 186         npregs->cset.xywin = (4096 << 16) | 4096;
 187
 188         /* Clear the screen. */
 189         newport_clear_screen(0, 0, 1280 + 63, 1024, 0);
 190 }
 191
 192 /*
 193  * calculate the actual screen size by reading
 194  * the video timing out of the VC2
 195  */
 196 static void newport_get_screensize(void)
 197 {
 198         int i, cols;
 199         unsigned short ventry, treg;
 200         unsigned short linetable[128];  /* should be enough */
 201
 202         ventry = newport_vc2_get(npregs, VC2_IREG_VENTRY);
 203         newport_vc2_set(npregs, VC2_IREG_RADDR, ventry);
 204         npregs->set.dcbmode = (NPORT_DMODE_AVC2 | VC2_REGADDR_RAM |
 205                                NPORT_DMODE_W2 | VC2_PROTOCOL);
 206         for (i = 0; i < 128; i++) {
 207                 newport_bfwait(npregs);
 208                 linetable[i] = npregs->set.dcbdata0.byshort.s1;
 209         }
 210
 211         newport_xsize = newport_ysize = 0;
 212         for (i = 0; linetable[i + 1] && (i < sizeof(linetable)); i += 2) {
 213                 cols = 0;
 214                 newport_vc2_set(npregs, VC2_IREG_RADDR, linetable[i]);
 215                 npregs->set.dcbmode = (NPORT_DMODE_AVC2 | VC2_REGADDR_RAM |
 216                                        NPORT_DMODE_W2 | VC2_PROTOCOL);
 217                 do {
 218                         newport_bfwait(npregs);
 219                         treg = npregs->set.dcbdata0.byshort.s1;
 220                         if ((treg & 1) == 0)
 221                                 cols += (treg >> 7) & 0xfe;
 222                         if ((treg & 0x80) == 0) {
 223                                 newport_bfwait(npregs);
 224                                 treg = npregs->set.dcbdata0.byshort.s1;
 225                         }
 226                 } while ((treg & 0x8000) == 0);
 227                 if (cols) {
 228                         if (cols > newport_xsize)
 229                                 newport_xsize = cols;
 230                         newport_ysize += linetable[i + 1];
 231                 }
 232         }
 233         printk("NG1: Screensize %dx%d\n", newport_xsize, newport_ysize);
 234 }
 235
 236 static void newport_get_revisions(void)
 237 {
 238         unsigned int tmp;
 239         unsigned int board_rev;
 240         unsigned int rex3_rev;
 241         unsigned int vc2_rev;
 242         unsigned int cmap_rev;
 243         unsigned int xmap9_rev;
 244         unsigned int bt445_rev;
 245         unsigned int bitplanes;
 246
 247         rex3_rev = npregs->cset.status & NPORT_STAT_VERS;
 248
 249         npregs->set.dcbmode = (DCB_CMAP0 | NCMAP_PROTOCOL |
 250                                NCMAP_REGADDR_RREG | NPORT_DMODE_W1);
 251         tmp = npregs->set.dcbdata0.bybytes.b3;
 252         cmap_rev = tmp & 7;
 253         board_rev = (tmp >> 4) & 7;
 254         bitplanes = ((board_rev > 1) && (tmp & 0x80)) ? 8 : 24;
 255
 256         npregs->set.dcbmode = (DCB_CMAP1 | NCMAP_PROTOCOL |
 257                                NCMAP_REGADDR_RREG | NPORT_DMODE_W1);
 258         tmp = npregs->set.dcbdata0.bybytes.b3;
 259         if ((tmp & 7) < cmap_rev)
 260                 cmap_rev = (tmp & 7);
 261
 262         vc2_rev = (newport_vc2_get(npregs, VC2_IREG_CONFIG) >> 5) & 7;
 263
 264         npregs->set.dcbmode = (DCB_XMAP0 | R_DCB_XMAP9_PROTOCOL |
 265                                XM9_CRS_REVISION | NPORT_DMODE_W1);
 266         xmap9_rev = npregs->set.dcbdata0.bybytes.b3 & 7;
 267
 268         npregs->set.dcbmode = (DCB_BT445 | BT445_PROTOCOL |
 269                                BT445_CSR_ADDR_REG | NPORT_DMODE_W1);
 270         npregs->set.dcbdata0.bybytes.b3 = BT445_REVISION_REG;
 271         npregs->set.dcbmode = (DCB_BT445 | BT445_PROTOCOL |
 272                                BT445_CSR_REVISION | NPORT_DMODE_W1);
 273         bt445_rev = (npregs->set.dcbdata0.bybytes.b3 >> 4) - 0x0a;
 274
 275 #define L(a)     (char)('A'+(a))
 276         printk
 277             ("NG1: Revision %d, %d bitplanes, REX3 revision %c, VC2 revision %c, xmap9 revision %c, cmap revision %c, bt445 revision %c\n",
 278              board_rev, bitplanes, L(rex3_rev), L(vc2_rev), L(xmap9_rev),
 279              L(cmap_rev ? (cmap_rev + 1) : 0), L(bt445_rev));
 280 #undef L
 281
 282         if (board_rev == 3)     /* I don't know all affected revisions */
 283                 xcurs_correction = 21;
 284 }
 285
 286 static void newport_exit(void)
 287 {
 288         int i;
 289
 290         /* free memory used by user font */
 291         for (i = 0; i < MAX_NR_CONSOLES; i++)
 292                 newport_set_def_font(i, NULL);
 293 }
 294
 295 /* Can't be __init, take_over_console may call it later */
 296 static const char *newport_startup(void)
 297 {
 298         int i;
 299
 300         if (!sgi_gfxaddr)
 301                 return NULL;
 302
 303         if (!npregs)
 304                 npregs = (struct newport_regs *)/* ioremap cannot fail */
 305                         ioremap(sgi_gfxaddr, sizeof(struct newport_regs));
 306         npregs->cset.config = NPORT_CFG_GD0;
 307
 308         if (newport_wait(npregs))
 309                 goto out_unmap;
 310
 311         npregs->set.xstarti = TESTVAL;
 312         if (npregs->set._xstart.word != XSTI_TO_FXSTART(TESTVAL))
 313                 goto out_unmap;
 314
 315         for (i = 0; i < MAX_NR_CONSOLES; i++)
 316                 font_data[i] = FONT_DATA;
 317
 318         newport_reset();
 319         newport_get_revisions();
 320         newport_get_screensize();
 321         newport_has_init = 1;
 322
 323         return "SGI Newport";
 324
 325 out_unmap:
 326         return NULL;
 327 }
 328
 329 static void newport_init(struct vc_data *vc, int init)
 330 {
 331         vc->vc_cols = newport_xsize / 8;
 332         vc->vc_rows = newport_ysize / 16;
 333         vc->vc_can_do_color = 1;
 334 }
 335
 336 static void newport_deinit(struct vc_data *c)
 337 {
 338         if (!con_is_bound(&newport_con) && newport_has_init) {
 339                 newport_exit();
 340                 newport_has_init = 0;
 341         }
 342 }
 343
 344 static void newport_clear(struct vc_data *vc, int sy, int sx, int height,
 345                           int width)
 346 {
 347         int xend = ((sx + width) << 3) - 1;
 348         int ystart = ((sy << 4) + topscan) & 0x3ff;
 349         int yend = (((sy + height) << 4) + topscan - 1) & 0x3ff;
 350
 351         if (logo_active)
 352                 return;
 353
 354         if (ystart < yend) {
 355                 newport_clear_screen(sx << 3, ystart, xend, yend,
 356                                      (vc->vc_color & 0xf0) >> 4);
 357         } else {
 358                 newport_clear_screen(sx << 3, ystart, xend, 1023,
 359                                      (vc->vc_color & 0xf0) >> 4);
 360                 newport_clear_screen(sx << 3, 0, xend, yend,
 361                                      (vc->vc_color & 0xf0) >> 4);
 362         }
 363 }
 364
 365 static void newport_putc(struct vc_data *vc, int charattr, int ypos,
 366                          int xpos)
 367 {
 368         unsigned char *p;
 369
 370         p = &font_data[vc->vc_num][(charattr & 0xff) << 4];
 371         charattr = (charattr >> 8) & 0xff;
 372         xpos <<= 3;
 373         ypos <<= 4;
 374
 375         newport_render_background(xpos, ypos, xpos, ypos,
 376                                   (charattr & 0xf0) >> 4);
 377
 378         /* Set the color and drawing mode. */
 379         newport_wait(npregs);
 380         npregs->set.colori = charattr & 0xf;
 381         npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
 382                                  NPORT_DMODE0_STOPX | NPORT_DMODE0_ZPENAB |
 383                                  NPORT_DMODE0_L32);
 384
 385         /* Set coordinates for bitmap operation. */
 386         npregs->set.xystarti = (xpos << 16) | ((ypos + topscan) & 0x3ff);
 387         npregs->set.xyendi = ((xpos + 7) << 16);
 388         newport_wait(npregs);
 389
 390         /* Go, baby, go... */
 391         RENDER(npregs, p);
 392 }
 393
 394 static void newport_putcs(struct vc_data *vc, const unsigned short *s,
 395                           int count, int ypos, int xpos)
 396 {
 397         int i;
 398         int charattr;
 399         unsigned char *p;
 400
 401         charattr = (scr_readw(s) >> 8) & 0xff;
 402
 403         xpos <<= 3;
 404         ypos <<= 4;
 405
 406         if (!logo_active)
 407                 /* Clear the area behing the string */
 408                 newport_render_background(xpos, ypos,
 409                                           xpos + ((count - 1) << 3), ypos,
 410                                           (charattr & 0xf0) >> 4);
 411
 412         newport_wait(npregs);
 413
 414         /* Set the color and drawing mode. */
 415         npregs->set.colori = charattr & 0xf;
 416         npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
 417                                  NPORT_DMODE0_STOPX | NPORT_DMODE0_ZPENAB |
 418                                  NPORT_DMODE0_L32);
 419
 420         for (i = 0; i < count; i++, xpos += 8) {
 421                 p = &font_data[vc->vc_num][(scr_readw(s++) & 0xff) << 4];
 422
 423                 newport_wait(npregs);
 424
 425                 /* Set coordinates for bitmap operation. */
 426                 npregs->set.xystarti =
 427                     (xpos << 16) | ((ypos + topscan) & 0x3ff);
 428                 npregs->set.xyendi = ((xpos + 7) << 16);
 429
 430                 /* Go, baby, go... */
 431                 RENDER(npregs, p);
 432         }
 433 }
 434
 435 static void newport_cursor(struct vc_data *vc, int mode)
 436 {
 437         unsigned short treg;
 438         int xcurs, ycurs;
 439
 440         switch (mode) {
 441         case CM_ERASE:
 442                 treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
 443                 newport_vc2_set(npregs, VC2_IREG_CONTROL,
 444                                 (treg & ~(VC2_CTRL_ECDISP)));
 445                 break;
 446
 447         case CM_MOVE:
 448         case CM_DRAW:
 449                 treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
 450                 newport_vc2_set(npregs, VC2_IREG_CONTROL,
 451                                 (treg | VC2_CTRL_ECDISP));
 452                 xcurs = (vc->vc_pos - vc->vc_visible_origin) / 2;
 453                 ycurs = ((xcurs / vc->vc_cols) << 4) + 31;
 454                 xcurs = ((xcurs % vc->vc_cols) << 3) + xcurs_correction;
 455                 newport_vc2_set(npregs, VC2_IREG_CURSX, xcurs);
 456                 newport_vc2_set(npregs, VC2_IREG_CURSY, ycurs);
 457         }
 458 }
 459
 460 static int newport_switch(struct vc_data *vc)
 461 {
 462         static int logo_drawn = 0;
 463
 464         topscan = 0;
 465         npregs->cset.topscan = 0x3ff;
 466
 467         if (!logo_drawn) {
 468                 newport_show_logo();
 469                 logo_drawn = 1;
 470                 logo_active = 1;
 471         }
 472
 473         return 1;
 474 }
 475
 476 static int newport_blank(struct vc_data *c, int blank, int mode_switch)
 477 {
 478         unsigned short treg;
 479
 480         if (blank == 0) {
 481                 /* unblank console */
 482                 treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
 483                 newport_vc2_set(npregs, VC2_IREG_CONTROL,
 484                                 (treg | VC2_CTRL_EDISP));
 485         } else {
 486                 /* blank console */
 487                 treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
 488                 newport_vc2_set(npregs, VC2_IREG_CONTROL,
 489                                 (treg & ~(VC2_CTRL_EDISP)));
 490         }
 491         return 1;
 492 }
 493
 494 static int newport_set_font(int unit, struct console_font *op)
 495 {
 496         int w = op->width;
 497         int h = op->height;
 498         int size = h * op->charcount;
 499         int i;
 500         unsigned char *new_data, *data = op->data, *p;
 501
 502         /* ladis: when I grow up, there will be a day... and more sizes will
 503          * be supported ;-) */
 504         if ((w != 8) || (h != 16)
 505             || (op->charcount != 256 && op->charcount != 512))
 506                 return -EINVAL;
 507
 508         if (!(new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size,
 509              GFP_USER))) return -ENOMEM;
 510
 511         new_data += FONT_EXTRA_WORDS * sizeof(int);
 512         FNTSIZE(new_data) = size;
 513         FNTCHARCNT(new_data) = op->charcount;
 514         REFCOUNT(new_data) = 0; /* usage counter */
 515
 516         p = new_data;
 517         for (i = 0; i < op->charcount; i++) {
 518                 memcpy(p, data, h);
 519                 data += 32;
 520                 p += h;
 521         }
 522
 523         /* check if font is already used by other console */
 524         for (i = 0; i < MAX_NR_CONSOLES; i++) {
 525                 if (font_data[i] != FONT_DATA
 526                     && FNTSIZE(font_data[i]) == size
 527                     && !memcmp(font_data[i], new_data, size)) {
 528                         kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
 529                         /* current font is the same as the new one */
 530                         if (i == unit)
 531                                 return 0;
 532                         new_data = font_data[i];
 533                         break;
 534                 }
 535         }
 536         /* old font is user font */
 537         if (font_data[unit] != FONT_DATA) {
 538                 if (--REFCOUNT(font_data[unit]) == 0)
 539                         kfree(font_data[unit] -
 540                               FONT_EXTRA_WORDS * sizeof(int));
 541         }
 542         REFCOUNT(new_data)++;
 543         font_data[unit] = new_data;
 544
 545         return 0;
 546 }
 547
 548 static int newport_set_def_font(int unit, struct console_font *op)
 549 {
 550         if (font_data[unit] != FONT_DATA) {
 551                 if (--REFCOUNT(font_data[unit]) == 0)
 552                         kfree(font_data[unit] -
 553                               FONT_EXTRA_WORDS * sizeof(int));
 554                 font_data[unit] = FONT_DATA;
 555         }
 556
 557         return 0;
 558 }
 559
 560 static int newport_font_default(struct vc_data *vc, struct console_font *op, char *name)
 561 {
 562         return newport_set_def_font(vc->vc_num, op);
 563 }
 564
 565 static int newport_font_set(struct vc_data *vc, struct console_font *font, unsigned flags)
 566 {
 567         return newport_set_font(vc->vc_num, font);
 568 }
 569
 570 static int newport_set_palette(struct vc_data *vc, unsigned char *table)
 571 {
 572         return -EINVAL;
 573 }
 574
 575 static int newport_scrolldelta(struct vc_data *vc, int lines)
 576 {
 577         /* there is (nearly) no off-screen memory, so we can't scroll back */
 578         return 0;
 579 }
 580
 581 static int newport_scroll(struct vc_data *vc, int t, int b, int dir,
 582                           int lines)
 583 {
 584         int count, x, y;
 585         unsigned short *s, *d;
 586         unsigned short chattr;
 587
 588         logo_active = 0;        /* it's time to disable the logo now.. */
 589
 590         if (t == 0 && b == vc->vc_rows) {
 591                 if (dir == SM_UP) {
 592                         topscan = (topscan + (lines << 4)) & 0x3ff;
 593                         newport_clear_lines(vc->vc_rows - lines,
 594                                             vc->vc_rows - 1,
 595                                             (vc->vc_color & 0xf0) >> 4);
 596                 } else {
 597                         topscan = (topscan + (-lines << 4)) & 0x3ff;
 598                         newport_clear_lines(0, lines - 1,
 599                                             (vc->vc_color & 0xf0) >> 4);
 600                 }
 601                 npregs->cset.topscan = (topscan - 1) & 0x3ff;
 602                 return 0;
 603         }
 604
 605         count = (b - t - lines) * vc->vc_cols;
 606         if (dir == SM_UP) {
 607                 x = 0;
 608                 y = t;
 609                 s = (unsigned short *) (vc->vc_origin +
 610                                         vc->vc_size_row * (t + lines));
 611                 d = (unsigned short *) (vc->vc_origin +
 612                                         vc->vc_size_row * t);
 613                 while (count--) {
 614                         chattr = scr_readw(s++);
 615                         if (chattr != scr_readw(d)) {
 616                                 newport_putc(vc, chattr, y, x);
 617                                 scr_writew(chattr, d);
 618                         }
 619                         d++;
 620                         if (++x == vc->vc_cols) {
 621                                 x = 0;
 622                                 y++;
 623                         }
 624                 }
 625                 d = (unsigned short *) (vc->vc_origin +
 626                                         vc->vc_size_row * (b - lines));
 627                 x = 0;
 628                 y = b - lines;
 629                 for (count = 0; count < (lines * vc->vc_cols); count++) {
 630                         if (scr_readw(d) != vc->vc_video_erase_char) {
 631                                 newport_putc(vc, vc->vc_video_erase_char,
 632                                              y, x);
 633                                 scr_writew(vc->vc_video_erase_char, d);
 634                         }
 635                         d++;
 636                         if (++x == vc->vc_cols) {
 637                                 x = 0;
 638                                 y++;
 639                         }
 640                 }
 641         } else {
 642                 x = vc->vc_cols - 1;
 643                 y = b - 1;
 644                 s = (unsigned short *) (vc->vc_origin +
 645                                         vc->vc_size_row * (b - lines) - 2);
 646                 d = (unsigned short *) (vc->vc_origin +
 647                                         vc->vc_size_row * b - 2);
 648                 while (count--) {
 649                         chattr = scr_readw(s--);
 650                         if (chattr != scr_readw(d)) {
 651                                 newport_putc(vc, chattr, y, x);
 652                                 scr_writew(chattr, d);
 653                         }
 654                         d--;
 655                         if (x-- == 0) {
 656                                 x = vc->vc_cols - 1;
 657                                 y--;
 658                         }
 659                 }
 660                 d = (unsigned short *) (vc->vc_origin +
 661                                         vc->vc_size_row * t);
 662                 x = 0;
 663                 y = t;
 664                 for (count = 0; count < (lines * vc->vc_cols); count++) {
 665                         if (scr_readw(d) != vc->vc_video_erase_char) {
 666                                 newport_putc(vc, vc->vc_video_erase_char,
 667                                              y, x);
 668                                 scr_writew(vc->vc_video_erase_char, d);
 669                         }
 670                         d++;
 671                         if (++x == vc->vc_cols) {
 672                                 x = 0;
 673                                 y++;
 674                         }
 675                 }
 676         }
 677         return 1;
 678 }
 679
 680 static void newport_bmove(struct vc_data *vc, int sy, int sx, int dy,
 681                           int dx, int h, int w)
 682 {
 683         short xs, ys, xe, ye, xoffs, yoffs, tmp;
 684
 685         xs = sx << 3;
 686         xe = ((sx + w) << 3) - 1;
 687         /*
 688          * as bmove is only used to move stuff around in the same line
 689          * (h == 1), we don't care about wrap arounds caused by topscan != 0
 690          */
 691         ys = ((sy << 4) + topscan) & 0x3ff;
 692         ye = (((sy + h) << 4) - 1 + topscan) & 0x3ff;
 693         xoffs = (dx - sx) << 3;
 694         yoffs = (dy - sy) << 4;
 695         if (xoffs > 0) {
 696                 /* move to the right, exchange starting points */
 697                 tmp = xe;
 698                 xe = xs;
 699                 xs = tmp;
 700         }
 701         newport_wait(npregs);
 702         npregs->set.drawmode0 = (NPORT_DMODE0_S2S | NPORT_DMODE0_BLOCK |
 703                                  NPORT_DMODE0_DOSETUP | NPORT_DMODE0_STOPX
 704                                  | NPORT_DMODE0_STOPY);
 705         npregs->set.xystarti = (xs << 16) | ys;
 706         npregs->set.xyendi = (xe << 16) | ye;
 707         npregs->go.xymove = (xoffs << 16) | yoffs;
 708 }
 709
 710 static int newport_dummy(struct vc_data *c)
 711 {
 712         return 0;
 713 }
 714
 715 #define DUMMY (void *) newport_dummy
 716
 717 const struct consw newport_con = {
 718         .owner            = THIS_MODULE,
 719         .con_startup      = newport_startup,
 720         .con_init         = newport_init,
 721         .con_deinit       = newport_deinit,
 722         .con_clear        = newport_clear,
 723         .con_putc         = newport_putc,
 724         .con_putcs        = newport_putcs,
 725         .con_cursor       = newport_cursor,
 726         .con_scroll       = newport_scroll,
 727         .con_bmove        = newport_bmove,
 728         .con_switch       = newport_switch,
 729         .con_blank        = newport_blank,
 730         .con_font_set     = newport_font_set,
 731         .con_font_default = newport_font_default,
 732         .con_set_palette  = newport_set_palette,
 733         .con_scrolldelta  = newport_scrolldelta,
 734         .con_set_origin   = DUMMY,
 735         .con_save_screen  = DUMMY
 736 };
 737
 738 #ifdef MODULE
 739 static int __init newport_console_init(void)
 740 {
 741
 742         if (!sgi_gfxaddr)
 743                 return NULL;
 744
 745         if (!npregs)
 746                 npregs = (struct newport_regs *)/* ioremap cannot fail */
 747                         ioremap(sgi_gfxaddr, sizeof(struct newport_regs));
 748
 749         return take_over_console(&newport_con, 0, MAX_NR_CONSOLES - 1, 1);
 750 }
 751 module_init(newport_console_init);
 752
 753 static void __exit newport_console_exit(void)
 754 {
 755         give_up_console(&newport_con);
 756         iounmap((void *)npregs);
 757 }
 758 module_exit(newport_console_exit);
 759 #endif
 760
 761 MODULE_LICENSE("GPL");