drivers/video/hgafb.c

   1 /*
   2  * linux/drivers/video/hgafb.c -- Hercules graphics adaptor frame buffer device
   3  *
   4  *      Created 25 Nov 1999 by Ferenc Bakonyi (fero@drama.obuda.kando.hu)
   5  *      Based on skeletonfb.c by Geert Uytterhoeven and
   6  *               mdacon.c by Andrew Apted
   7  *
   8  * History:
   9  *
  10  * - Revision 0.1.8 (23 Oct 2002): Ported to new framebuffer api.
  11  *
  12  * - Revision 0.1.7 (23 Jan 2001): fix crash resulting from MDA only cards
  13  *                                 being detected as Hercules.   (Paul G.)
  14  * - Revision 0.1.6 (17 Aug 2000): new style structs
  15  *                                 documentation
  16  * - Revision 0.1.5 (13 Mar 2000): spinlocks instead of saveflags();cli();etc
  17  *                                 minor fixes
  18  * - Revision 0.1.4 (24 Jan 2000): fixed a bug in hga_card_detect() for
  19  *                                  HGA-only systems
  20  * - Revision 0.1.3 (22 Jan 2000): modified for the new fb_info structure
  21  *                                 screen is cleared after rmmod
  22  *                                 virtual resolutions
  23  *                                 module parameter 'nologo={0|1}'
  24  *                                 the most important: boot logo :)
  25  * - Revision 0.1.0  (6 Dec 1999): faster scrolling and minor fixes
  26  * - First release  (25 Nov 1999)
  27  *
  28  * This file is subject to the terms and conditions of the GNU General Public
  29  * License.  See the file COPYING in the main directory of this archive
  30  * for more details.
  31  */
  32
  33 #include <linux/module.h>
  34 #include <linux/kernel.h>
  35 #include <linux/errno.h>
  36 #include <linux/spinlock.h>
  37 #include <linux/string.h>
  38 #include <linux/mm.h>
  39 #include <linux/tty.h>
  40 #include <linux/slab.h>
  41 #include <linux/delay.h>
  42 #include <linux/fb.h>
  43 #include <linux/init.h>
  44 #include <linux/ioport.h>
  45 #include <asm/io.h>
  46 #include <asm/vga.h>
  47
  48 #if 0
  49 #define DPRINTK(args...) printk(KERN_DEBUG __FILE__": " ##args)
  50 #else
  51 #define DPRINTK(args...)
  52 #endif
  53
  54 #if 0
  55 #define CHKINFO(ret) if (info != &fb_info) { printk(KERN_DEBUG __FILE__": This should never happen, line:%d \n", __LINE__); return ret; }
  56 #else
  57 #define CHKINFO(ret)
  58 #endif
  59
  60 /* Description of the hardware layout */
  61
  62 static unsigned long hga_vram_base;             /* Base of video memory */
  63 static unsigned long hga_vram_len;              /* Size of video memory */
  64
  65 #define HGA_ROWADDR(row) ((row%4)*8192 + (row>>2)*90)
  66 #define HGA_TXT                 0
  67 #define HGA_GFX                 1
  68
  69 static inline u8* rowaddr(struct fb_info *info, u_int row)
  70 {
  71         return info->screen_base + HGA_ROWADDR(row);
  72 }
  73
  74 static int hga_mode = -1;                       /* 0 = txt, 1 = gfx mode */
  75
  76 static enum { TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } hga_type;
  77 static char *hga_type_name;
  78
  79 #define HGA_INDEX_PORT          0x3b4           /* Register select port */
  80 #define HGA_VALUE_PORT          0x3b5           /* Register value port */
  81 #define HGA_MODE_PORT           0x3b8           /* Mode control port */
  82 #define HGA_STATUS_PORT         0x3ba           /* Status and Config port */
  83 #define HGA_GFX_PORT            0x3bf           /* Graphics control port */
  84
  85 /* HGA register values */
  86
  87 #define HGA_CURSOR_BLINKING     0x00
  88 #define HGA_CURSOR_OFF          0x20
  89 #define HGA_CURSOR_SLOWBLINK    0x60
  90
  91 #define HGA_MODE_GRAPHICS       0x02
  92 #define HGA_MODE_VIDEO_EN       0x08
  93 #define HGA_MODE_BLINK_EN       0x20
  94 #define HGA_MODE_GFX_PAGE1      0x80
  95
  96 #define HGA_STATUS_HSYNC        0x01
  97 #define HGA_STATUS_VSYNC        0x80
  98 #define HGA_STATUS_VIDEO        0x08
  99
 100 #define HGA_CONFIG_COL132       0x08
 101 #define HGA_GFX_MODE_EN         0x01
 102 #define HGA_GFX_PAGE_EN         0x02
 103
 104 /* Global locks */
 105
 106 static spinlock_t hga_reg_lock = SPIN_LOCK_UNLOCKED;
 107
 108 /* Framebuffer driver structures */
 109
 110 static struct fb_var_screeninfo hga_default_var = {
 111         .xres           = 720,
 112         .yres           = 348,
 113         .xres_virtual   = 720,
 114         .yres_virtual   = 348,
 115         .bits_per_pixel = 1,
 116         .red            = {0, 1, 0},
 117         .green          = {0, 1, 0},
 118         .blue           = {0, 1, 0},
 119         .transp         = {0, 0, 0},
 120         .height         = -1,
 121         .width          = -1,
 122 };
 123
 124 static struct fb_fix_screeninfo hga_fix = {
 125         .id             = "HGA",
 126         .type           = FB_TYPE_PACKED_PIXELS,        /* (not sure) */
 127         .visual         = FB_VISUAL_MONO10,
 128         .xpanstep       = 8,
 129         .ypanstep       = 8,
 130         .line_length    = 90,
 131         .accel          = FB_ACCEL_NONE
 132 };
 133
 134 static struct fb_info fb_info;
 135
 136 /* Don't assume that tty1 will be the initial current console. */
 137 static int release_io_port = 0;
 138 static int release_io_ports = 0;
 139 static int nologo = 0;
 140
 141 /* -------------------------------------------------------------------------
 142  *
 143  * Low level hardware functions
 144  *
 145  * ------------------------------------------------------------------------- */
 146
 147 static void write_hga_b(unsigned int val, unsigned char reg)
 148 {
 149         outb_p(reg, HGA_INDEX_PORT);
 150         outb_p(val, HGA_VALUE_PORT);
 151 }
 152
 153 static void write_hga_w(unsigned int val, unsigned char reg)
 154 {
 155         outb_p(reg,   HGA_INDEX_PORT); outb_p(val >> 8,   HGA_VALUE_PORT);
 156         outb_p(reg+1, HGA_INDEX_PORT); outb_p(val & 0xff, HGA_VALUE_PORT);
 157 }
 158
 159 static int test_hga_b(unsigned char val, unsigned char reg)
 160 {
 161         outb_p(reg, HGA_INDEX_PORT);
 162         outb  (val, HGA_VALUE_PORT);
 163         udelay(20); val = (inb_p(HGA_VALUE_PORT) == val);
 164         return val;
 165 }
 166
 167 static void hga_clear_screen(void)
 168 {
 169         unsigned char fillchar = 0xbf; /* magic */
 170         unsigned long flags;
 171
 172         spin_lock_irqsave(&hga_reg_lock, flags);
 173         if (hga_mode == HGA_TXT)
 174                 fillchar = ' ';
 175         else if (hga_mode == HGA_GFX)
 176                 fillchar = 0x00;
 177         spin_unlock_irqrestore(&hga_reg_lock, flags);
 178         if (fillchar != 0xbf)
 179                 isa_memset_io(hga_vram_base, fillchar, hga_vram_len);
 180 }
 181
 182 static void hga_txt_mode(void)
 183 {
 184         unsigned long flags;
 185
 186         spin_lock_irqsave(&hga_reg_lock, flags);
 187         outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_BLINK_EN, HGA_MODE_PORT);
 188         outb_p(0x00, HGA_GFX_PORT);
 189         outb_p(0x00, HGA_STATUS_PORT);
 190
 191         write_hga_b(0x61, 0x00);        /* horizontal total */
 192         write_hga_b(0x50, 0x01);        /* horizontal displayed */
 193         write_hga_b(0x52, 0x02);        /* horizontal sync pos */
 194         write_hga_b(0x0f, 0x03);        /* horizontal sync width */
 195
 196         write_hga_b(0x19, 0x04);        /* vertical total */
 197         write_hga_b(0x06, 0x05);        /* vertical total adjust */
 198         write_hga_b(0x19, 0x06);        /* vertical displayed */
 199         write_hga_b(0x19, 0x07);        /* vertical sync pos */
 200
 201         write_hga_b(0x02, 0x08);        /* interlace mode */
 202         write_hga_b(0x0d, 0x09);        /* maximum scanline */
 203         write_hga_b(0x0c, 0x0a);        /* cursor start */
 204         write_hga_b(0x0d, 0x0b);        /* cursor end */
 205
 206         write_hga_w(0x0000, 0x0c);      /* start address */
 207         write_hga_w(0x0000, 0x0e);      /* cursor location */
 208
 209         hga_mode = HGA_TXT;
 210         spin_unlock_irqrestore(&hga_reg_lock, flags);
 211 }
 212
 213 static void hga_gfx_mode(void)
 214 {
 215         unsigned long flags;
 216
 217         spin_lock_irqsave(&hga_reg_lock, flags);
 218         outb_p(0x00, HGA_STATUS_PORT);
 219         outb_p(HGA_GFX_MODE_EN, HGA_GFX_PORT);
 220         outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);
 221
 222         write_hga_b(0x35, 0x00);        /* horizontal total */
 223         write_hga_b(0x2d, 0x01);        /* horizontal displayed */
 224         write_hga_b(0x2e, 0x02);        /* horizontal sync pos */
 225         write_hga_b(0x07, 0x03);        /* horizontal sync width */
 226
 227         write_hga_b(0x5b, 0x04);        /* vertical total */
 228         write_hga_b(0x02, 0x05);        /* vertical total adjust */
 229         write_hga_b(0x57, 0x06);        /* vertical displayed */
 230         write_hga_b(0x57, 0x07);        /* vertical sync pos */
 231
 232         write_hga_b(0x02, 0x08);        /* interlace mode */
 233         write_hga_b(0x03, 0x09);        /* maximum scanline */
 234         write_hga_b(0x00, 0x0a);        /* cursor start */
 235         write_hga_b(0x00, 0x0b);        /* cursor end */
 236
 237         write_hga_w(0x0000, 0x0c);      /* start address */
 238         write_hga_w(0x0000, 0x0e);      /* cursor location */
 239
 240         hga_mode = HGA_GFX;
 241         spin_unlock_irqrestore(&hga_reg_lock, flags);
 242 }
 243
 244 static void hga_show_logo(struct fb_info *info)
 245 {
 246 /*
 247         unsigned long dest = hga_vram_base;
 248         char *logo = linux_logo_bw;
 249         int x, y;
 250
 251         for (y = 134; y < 134 + 80 ; y++) * this needs some cleanup *
 252                 for (x = 0; x < 10 ; x++)
 253                         isa_writeb(~*(logo++),(dest + HGA_ROWADDR(y) + x + 40));
 254 */
 255 }
 256
 257 static void hga_pan(unsigned int xoffset, unsigned int yoffset)
 258 {
 259         unsigned int base;
 260         unsigned long flags;
 261
 262         base = (yoffset / 8) * 90 + xoffset;
 263         spin_lock_irqsave(&hga_reg_lock, flags);
 264         write_hga_w(base, 0x0c);        /* start address */
 265         spin_unlock_irqrestore(&hga_reg_lock, flags);
 266         DPRINTK("hga_pan: base:%d\n", base);
 267 }
 268
 269 static void hga_blank(int blank_mode)
 270 {
 271         unsigned long flags;
 272
 273         spin_lock_irqsave(&hga_reg_lock, flags);
 274         if (blank_mode) {
 275                 outb_p(0x00, HGA_MODE_PORT);    /* disable video */
 276         } else {
 277                 outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);
 278         }
 279         spin_unlock_irqrestore(&hga_reg_lock, flags);
 280 }
 281
 282 static int __init hga_card_detect(void)
 283 {
 284         int count=0;
 285         unsigned long p, q;
 286         unsigned short p_save, q_save;
 287
 288         hga_vram_base = 0xb0000;
 289         hga_vram_len  = 0x08000;
 290
 291         if (request_region(0x3b0, 12, "hgafb"))
 292                 release_io_ports = 1;
 293         if (request_region(0x3bf, 1, "hgafb"))
 294                 release_io_port = 1;
 295
 296         /* do a memory check */
 297
 298         p = hga_vram_base;
 299         q = hga_vram_base + 0x01000;
 300
 301         p_save = isa_readw(p); q_save = isa_readw(q);
 302
 303         isa_writew(0xaa55, p); if (isa_readw(p) == 0xaa55) count++;
 304         isa_writew(0x55aa, p); if (isa_readw(p) == 0x55aa) count++;
 305         isa_writew(p_save, p);
 306
 307         if (count != 2) {
 308                 return 0;
 309         }
 310
 311         /* Ok, there is definitely a card registering at the correct
 312          * memory location, so now we do an I/O port test.
 313          */
 314
 315         if (!test_hga_b(0x66, 0x0f)) {      /* cursor low register */
 316                 return 0;
 317         }
 318         if (!test_hga_b(0x99, 0x0f)) {     /* cursor low register */
 319                 return 0;
 320         }
 321
 322         /* See if the card is a Hercules, by checking whether the vsync
 323          * bit of the status register is changing.  This test lasts for
 324          * approximately 1/10th of a second.
 325          */
 326
 327         p_save = q_save = inb_p(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
 328
 329         for (count=0; count < 50000 && p_save == q_save; count++) {
 330                 q_save = inb(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
 331                 udelay(2);
 332         }
 333
 334         if (p_save == q_save)
 335                 return 0;
 336
 337         switch (inb_p(HGA_STATUS_PORT) & 0x70) {
 338                 case 0x10:
 339                         hga_type = TYPE_HERCPLUS;
 340                         hga_type_name = "HerculesPlus";
 341                         break;
 342                 case 0x50:
 343                         hga_type = TYPE_HERCCOLOR;
 344                         hga_type_name = "HerculesColor";
 345                         break;
 346                 default:
 347                         hga_type = TYPE_HERC;
 348                         hga_type_name = "Hercules";
 349                         break;
 350         }
 351         return 1;
 352 }
 353
 354 /**
 355  *      hgafb_open - open the framebuffer device
 356  *      @info:pointer to fb_info object containing info for current hga board
 357  *      @int:open by console system or userland.
 358  */
 359
 360 static int hgafb_open(struct fb_info *info, int init)
 361 {
 362         hga_gfx_mode();
 363         hga_clear_screen();
 364         if (!nologo) hga_show_logo(info);
 365         return 0;
 366 }
 367
 368 /**
 369  *      hgafb_open - open the framebuffer device
 370  *      @info:pointer to fb_info object containing info for current hga board
 371  *      @int:open by console system or userland.
 372  */
 373
 374 static int hgafb_release(struct fb_info *info, int init)
 375 {
 376         hga_txt_mode();
 377         hga_clear_screen();
 378         return 0;
 379 }
 380
 381 /**
 382  *      hgafb_setcolreg - set color registers
 383  *      @regno:register index to set
 384  *      @red:red value, unused
 385  *      @green:green value, unused
 386  *      @blue:blue value, unused
 387  *      @transp:transparency value, unused
 388  *      @info:unused
 389  *
 390  *      This callback function is used to set the color registers of a HGA
 391  *      board. Since we have only two fixed colors only @regno is checked.
 392  *      A zero is returned on success and 1 for failure.
 393  */
 394
 395 static int hgafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 396                            u_int transp, struct fb_info *info)
 397 {
 398         if (regno > 1)
 399                 return 1;
 400         return 0;
 401 }
 402
 403 /**
 404  *      hga_pan_display - pan or wrap the display
 405  *      @var:contains new xoffset, yoffset and vmode values
 406  *      @info:pointer to fb_info object containing info for current hga board
 407  *
 408  *      This function looks only at xoffset, yoffset and the %FB_VMODE_YWRAP
 409  *      flag in @var. If input parameters are correct it calls hga_pan() to
 410  *      program the hardware. @info->var is updated to the new values.
 411  *      A zero is returned on success and %-EINVAL for failure.
 412  */
 413
 414 int hgafb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
 415 {
 416         if (var->vmode & FB_VMODE_YWRAP) {
 417                 if (var->yoffset < 0 ||
 418                     var->yoffset >= info->var.yres_virtual ||
 419                     var->xoffset)
 420                         return -EINVAL;
 421         } else {
 422                 if (var->xoffset + var->xres > info->var.xres_virtual
 423                  || var->yoffset + var->yres > info->var.yres_virtual
 424                  || var->yoffset % 8)
 425                         return -EINVAL;
 426         }
 427
 428         hga_pan(var->xoffset, var->yoffset);
 429         return 0;
 430 }
 431
 432 /**
 433  *      hgafb_blank - (un)blank the screen
 434  *      @blank_mode:blanking method to use
 435  *      @info:unused
 436  *
 437  *      Blank the screen if blank_mode != 0, else unblank.
 438  *      Implements VESA suspend and powerdown modes on hardware that supports
 439  *      disabling hsync/vsync:
 440  *              @blank_mode == 2 means suspend vsync,
 441  *              @blank_mode == 3 means suspend hsync,
 442  *              @blank_mode == 4 means powerdown.
 443  */
 444
 445 static int hgafb_blank(int blank_mode, struct fb_info *info)
 446 {
 447         hga_blank(blank_mode);
 448         return 0;
 449 }
 450
 451 /*
 452  * Accel functions
 453  */
 454 #ifdef CONFIG_FB_HGA_ACCEL
 455 static void hgafb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
 456 {
 457         u_int rows, y;
 458         u8 *dest;
 459
 460         y = rect->dy;
 461
 462         for (rows = rect->height; rows--; y++) {
 463                 dest = rowaddr(info, y) + (rect->dx >> 3);
 464                 switch (rect->rop) {
 465                 case ROP_COPY:
 466                         //fb_memset(dest, rect->color, (rect->width >> 3));
 467                         break;
 468                 case ROP_XOR:
 469                         *dest = ~*dest;
 470                         break;
 471                 }
 472         }
 473 }
 474
 475 static void hgafb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
 476 {
 477         u_int rows, y1, y2;
 478         u8 *src, *dest;
 479
 480         if (area->dy <= area->sy) {
 481                 y1 = area->sy;
 482                 y2 = area->dy;
 483
 484                 for (rows = area->height; rows--; ) {
 485                         src = rowaddr(info, y1) + (area->sx >> 3);
 486                         dest = rowaddr(info, y2) + (area->dx >> 3);
 487                         //fb_memmove(dest, src, (area->width >> 3));
 488                         y1++;
 489                         y2++;
 490                 }
 491         } else {
 492                 y1 = area->sy + area->height - 1;
 493                 y2 = area->dy + area->height - 1;
 494
 495                 for (rows = area->height; rows--;) {
 496                         src = rowaddr(info, y1) + (area->sx >> 3);
 497                         dest = rowaddr(info, y2) + (area->dx >> 3);
 498                         //fb_memmove(dest, src, (area->width >> 3));
 499                         y1--;
 500                         y2--;
 501                 }
 502         }
 503 }
 504
 505 static void hgafb_imageblit(struct fb_info *info, const struct fb_image *image)
 506 {
 507         u8 *dest, *cdat = (u8 *) image->data;
 508         u_int rows, y = image->dy;
 509         u8 d;
 510
 511         for (rows = image->height; rows--; y++) {
 512                 d = *cdat++;
 513                 dest = rowaddr(info, y) + (image->dx >> 3);
 514                 *dest = d;
 515         }
 516 }
 517 #else /* !CONFIG_FB_HGA_ACCEL */
 518 #define hgafb_fillrect cfb_fillrect
 519 #define hgafb_copyarea cfb_copyarea
 520 #define hgafb_imageblit cfb_imageblit
 521 #endif /* CONFIG_FB_HGA_ACCEL */
 522
 523
 524 static struct fb_ops hgafb_ops = {
 525         .owner          = THIS_MODULE,
 526         .fb_open        = hgafb_open,
 527         .fb_release     = hgafb_release,
 528         .fb_setcolreg   = hgafb_setcolreg,
 529         .fb_pan_display = hgafb_pan_display,
 530         .fb_blank       = hgafb_blank,
 531         .fb_fillrect    = hgafb_fillrect,
 532         .fb_copyarea    = hgafb_copyarea,
 533         .fb_imageblit   = hgafb_imageblit,
 534 };
 535
 536 /* ------------------------------------------------------------------------- *
 537  *
 538  * Functions in fb_info
 539  *
 540  * ------------------------------------------------------------------------- */
 541
 542 /* ------------------------------------------------------------------------- */
 543
 544         /*
 545          *  Initialization
 546          */
 547
 548 int __init hgafb_init(void)
 549 {
 550         if (fb_get_options("hgafb", NULL))
 551                 return -ENODEV;
 552
 553         if (! hga_card_detect()) {
 554                 printk(KERN_INFO "hgafb: HGA card not detected.\n");
 555                 return -EINVAL;
 556         }
 557
 558         printk(KERN_INFO "hgafb: %s with %ldK of memory detected.\n",
 559                 hga_type_name, hga_vram_len/1024);
 560
 561         hga_fix.smem_start = VGA_MAP_MEM(hga_vram_base);
 562         hga_fix.smem_len = hga_vram_len;
 563
 564         fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
 565         fb_info.var = hga_default_var;
 566         fb_info.fix = hga_fix;
 567         fb_info.monspecs.hfmin = 0;
 568         fb_info.monspecs.hfmax = 0;
 569         fb_info.monspecs.vfmin = 10000;
 570         fb_info.monspecs.vfmax = 10000;
 571         fb_info.monspecs.dpms = 0;
 572         fb_info.fbops = &hgafb_ops;
 573         fb_info.screen_base = (char *)hga_fix.smem_start;
 574
 575         if (register_framebuffer(&fb_info) < 0)
 576                 return -EINVAL;
 577
 578         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 579                fb_info.node, fb_info.fix.id);
 580         return 0;
 581 }
 582
 583         /*
 584          *  Setup
 585          */
 586
 587 int __init hgafb_setup(char *options)
 588 {
 589         return 0;
 590 }
 591
 592 #ifdef MODULE
 593 static void __exit hgafb_exit(void)
 594 {
 595         hga_txt_mode();
 596         hga_clear_screen();
 597         unregister_framebuffer(&fb_info);
 598         if (release_io_ports) release_region(0x3b0, 12);
 599         if (release_io_port) release_region(0x3bf, 1);
 600 }
 601 #endif
 602
 603 /* -------------------------------------------------------------------------
 604  *
 605  *  Modularization
 606  *
 607  * ------------------------------------------------------------------------- */
 608
 609 MODULE_AUTHOR("Ferenc Bakonyi (fero@drama.obuda.kando.hu)");
 610 MODULE_DESCRIPTION("FBDev driver for Hercules Graphics Adaptor");
 611 MODULE_LICENSE("GPL");
 612
 613 MODULE_PARM(nologo, "i");
 614 MODULE_PARM_DESC(nologo, "Disables startup logo if != 0 (default=0)");
 615 module_init(hgafb_init);
 616
 617 #ifdef MODULE
 618 module_exit(hgafb_exit);
 619 #endif