drivers/video/pmag-aa-fb.c

   1 /*
   2  *      linux/drivers/video/pmag-aa-fb.c
   3  *      Copyright 2002 Karsten Merker <merker@debian.org>
   4  *
   5  *      PMAG-AA TurboChannel framebuffer card support ... derived from
   6  *      pmag-ba-fb.c, which is Copyright (C) 1999, 2000, 2001 by
   7  *      Michael Engel <engel@unix-ag.org>, Karsten Merker <merker@debian.org>
   8  *      and Harald Koerfgen <hkoerfg@web.de>, which itself is derived from
   9  *      "HP300 Topcat framebuffer support (derived from macfb of all things)
  10  *      Phil Blundell <philb@gnu.org> 1998"
  11  *
  12  *      This file is subject to the terms and conditions of the GNU General
  13  *      Public License.  See the file COPYING in the main directory of this
  14  *      archive for more details.
  15  *
  16  *      2002-09-28  Karsten Merker <merker@linuxtag.org>
  17  *              Version 0.01: First try to get a PMAG-AA running.
  18  *
  19  *      2003-02-24  Thiemo Seufer  <seufer@csv.ica.uni-stuttgart.de>
  20  *              Version 0.02: Major code cleanup.
  21  *
  22  *      2003-09-21  Thiemo Seufer  <seufer@csv.ica.uni-stuttgart.de>
  23  *              Hardware cursor support.
  24  */
  25 #include <linux/module.h>
  26 #include <linux/kernel.h>
  27 #include <linux/sched.h>
  28 #include <linux/errno.h>
  29 #include <linux/string.h>
  30 #include <linux/timer.h>
  31 #include <linux/mm.h>
  32 #include <linux/slab.h>
  33 #include <linux/delay.h>
  34 #include <linux/init.h>
  35 #include <linux/fb.h>
  36 #include <linux/console.h>
  37
  38 #include <asm/bootinfo.h>
  39 #include <asm/dec/machtype.h>
  40 #include <asm/dec/tc.h>
  41
  42 #include <video/fbcon.h>
  43 #include <video/fbcon-cfb8.h>
  44
  45 #include "bt455.h"
  46 #include "bt431.h"
  47
  48 /* Version information */
  49 #define DRIVER_VERSION "0.02"
  50 #define DRIVER_AUTHOR "Karsten Merker <merker@linuxtag.org>"
  51 #define DRIVER_DESCRIPTION "PMAG-AA Framebuffer Driver"
  52
  53 /* Prototypes */
  54 static int aafb_set_var(struct fb_var_screeninfo *var, int con,
  55                         struct fb_info *info);
  56
  57 /*
  58  * Bt455 RAM DAC register base offset (rel. to TC slot base address).
  59  */
  60 #define PMAG_AA_BT455_OFFSET            0x100000
  61
  62 /*
  63  * Bt431 cursor generator offset (rel. to TC slot base address).
  64  */
  65 #define PMAG_AA_BT431_OFFSET            0x180000
  66
  67 /*
  68  * Begin of PMAG-AA framebuffer memory relative to TC slot address,
  69  * resolution is 1280x1024x1 (8 bits deep, but only LSB is used).
  70  */
  71 #define PMAG_AA_ONBOARD_FBMEM_OFFSET    0x200000
  72
  73 struct aafb_cursor {
  74         struct timer_list timer;
  75         int enable;
  76         int on;
  77         int vbl_cnt;
  78         int blink_rate;
  79         u16 x, y, width, height;
  80 };
  81
  82 #define CURSOR_TIMER_FREQ       (HZ / 50)
  83 #define CURSOR_BLINK_RATE       (20)
  84 #define CURSOR_DRAW_DELAY       (2)
  85
  86 struct aafb_info {
  87         struct fb_info info;
  88         struct display disp;
  89         struct aafb_cursor cursor;
  90         struct bt455_regs *bt455;
  91         struct bt431_regs *bt431;
  92         unsigned long fb_start;
  93         unsigned long fb_size;
  94         unsigned long fb_line_length;
  95 };
  96
  97 /*
  98  * Max 3 TURBOchannel slots -> max 3 PMAG-AA.
  99  */
 100 static struct aafb_info my_fb_info[3];
 101
 102 static struct aafb_par {
 103 } current_par;
 104
 105 static int currcon = -1;
 106
 107 static void aafb_set_cursor(struct aafb_info *info, int on)
 108 {
 109         struct aafb_cursor *c = &info->cursor;
 110
 111         if (on) {
 112                 bt431_position_cursor(info->bt431, c->x, c->y);
 113                 bt431_enable_cursor(info->bt431);
 114         } else
 115                 bt431_erase_cursor(info->bt431);
 116 }
 117
 118 static void aafbcon_cursor(struct display *disp, int mode, int x, int y)
 119 {
 120         struct aafb_info *info = (struct aafb_info *)disp->fb_info;
 121         struct aafb_cursor *c = &info->cursor;
 122
 123         x *= fontwidth(disp);
 124         y *= fontheight(disp);
 125
 126         if (c->x == x && c->y == y && (mode == CM_ERASE) == !c->enable)
 127                 return;
 128
 129         c->enable = 0;
 130         if (c->on)
 131                 aafb_set_cursor(info, 0);
 132         c->x = x - disp->var.xoffset;
 133         c->y = y - disp->var.yoffset;
 134
 135         switch (mode) {
 136                 case CM_ERASE:
 137                         c->on = 0;
 138                         break;
 139                 case CM_DRAW:
 140                 case CM_MOVE:
 141                         if (c->on)
 142                                 aafb_set_cursor(info, c->on);
 143                         else
 144                                 c->vbl_cnt = CURSOR_DRAW_DELAY;
 145                         c->enable = 1;
 146                         break;
 147         }
 148 }
 149
 150 static int aafbcon_set_font(struct display *disp, int width, int height)
 151 {
 152         struct aafb_info *info = (struct aafb_info *)disp->fb_info;
 153         struct aafb_cursor *c = &info->cursor;
 154         u8 fgc = ~attr_bgcol_ec(disp, disp->conp);
 155
 156         if (width > 64 || height > 64 || width < 0 || height < 0)
 157                 return -EINVAL;
 158
 159         c->height = height;
 160         c->width = width;
 161
 162         bt431_set_font(info->bt431, fgc, width, height);
 163
 164         return 1;
 165 }
 166
 167 static void aafb_cursor_timer_handler(unsigned long data)
 168 {
 169         struct aafb_info *info = (struct aafb_info *)data;
 170         struct aafb_cursor *c = &info->cursor;
 171
 172         if (!c->enable)
 173                 goto out;
 174
 175         if (c->vbl_cnt && --c->vbl_cnt == 0) {
 176                 c->on ^= 1;
 177                 aafb_set_cursor(info, c->on);
 178                 c->vbl_cnt = c->blink_rate;
 179         }
 180
 181 out:
 182         c->timer.expires = jiffies + CURSOR_TIMER_FREQ;
 183         add_timer(&c->timer);
 184 }
 185
 186 static void __init aafb_cursor_init(struct aafb_info *info)
 187 {
 188         struct aafb_cursor *c = &info->cursor;
 189
 190         c->enable = 1;
 191         c->on = 1;
 192         c->x = c->y = 0;
 193         c->width = c->height = 0;
 194         c->vbl_cnt = CURSOR_DRAW_DELAY;
 195         c->blink_rate = CURSOR_BLINK_RATE;
 196
 197         init_timer(&c->timer);
 198         c->timer.data = (unsigned long)info;
 199         c->timer.function = aafb_cursor_timer_handler;
 200         mod_timer(&c->timer, jiffies + CURSOR_TIMER_FREQ);
 201 }
 202
 203 static void __exit aafb_cursor_exit(struct aafb_info *info)
 204 {
 205         struct aafb_cursor *c = &info->cursor;
 206
 207         del_timer_sync(&c->timer);
 208 }
 209
 210 static struct display_switch aafb_switch8 = {
 211         .setup = fbcon_cfb8_setup,
 212         .bmove = fbcon_cfb8_bmove,
 213         .clear = fbcon_cfb8_clear,
 214         .putc = fbcon_cfb8_putc,
 215         .putcs = fbcon_cfb8_putcs,
 216         .revc = fbcon_cfb8_revc,
 217         .cursor = aafbcon_cursor,
 218         .set_font = aafbcon_set_font,
 219         .clear_margins = fbcon_cfb8_clear_margins,
 220         .fontwidthmask = FONTWIDTH(4)|FONTWIDTH(8)|FONTWIDTH(12)|FONTWIDTH(16)
 221 };
 222
 223 static void aafb_get_par(struct aafb_par *par)
 224 {
 225         *par = current_par;
 226 }
 227
 228 static int aafb_get_fix(struct fb_fix_screeninfo *fix, int con,
 229                         struct fb_info *info)
 230 {
 231         struct aafb_info *ip = (struct aafb_info *)info;
 232
 233         memset(fix, 0, sizeof(struct fb_fix_screeninfo));
 234         strcpy(fix->id, "PMAG-AA");
 235         fix->smem_start = ip->fb_start;
 236         fix->smem_len = ip->fb_size;
 237         fix->type = FB_TYPE_PACKED_PIXELS;
 238         fix->ypanstep = 1;
 239         fix->ywrapstep = 1;
 240         fix->visual = FB_VISUAL_MONO10;
 241         fix->line_length = 1280;
 242         fix->accel = FB_ACCEL_NONE;
 243
 244         return 0;
 245 }
 246
 247 static void aafb_set_disp(struct display *disp, int con,
 248                           struct aafb_info *info)
 249 {
 250         struct fb_fix_screeninfo fix;
 251
 252         disp->fb_info = &info->info;
 253         aafb_set_var(&disp->var, con, &info->info);
 254         if (disp->conp && disp->conp->vc_sw && disp->conp->vc_sw->con_cursor)
 255                 disp->conp->vc_sw->con_cursor(disp->conp, CM_ERASE);
 256         disp->dispsw = &aafb_switch8;
 257         disp->dispsw_data = 0;
 258
 259         aafb_get_fix(&fix, con, &info->info);
 260         disp->screen_base = (u8 *) fix.smem_start;
 261         disp->visual = fix.visual;
 262         disp->type = fix.type;
 263         disp->type_aux = fix.type_aux;
 264         disp->ypanstep = fix.ypanstep;
 265         disp->ywrapstep = fix.ywrapstep;
 266         disp->line_length = fix.line_length;
 267         disp->next_line = 2048;
 268         disp->can_soft_blank = 1;
 269         disp->inverse = 0;
 270         disp->scrollmode = SCROLL_YREDRAW;
 271
 272         aafbcon_set_font(disp, fontwidth(disp), fontheight(disp));
 273 }
 274
 275 static int aafb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
 276                          struct fb_info *info)
 277 {
 278         static u16 color[2] = {0x0000, 0x000f};
 279         static struct fb_cmap aafb_cmap = {0, 2, color, color, color, NULL};
 280
 281         fb_copy_cmap(&aafb_cmap, cmap, kspc ? 0 : 2);
 282         return 0;
 283 }
 284
 285 static int aafb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
 286                          struct fb_info *info)
 287 {
 288         u16 color[2] = {0x0000, 0x000f};
 289
 290         if (cmap->start == 0
 291             && cmap->len == 2
 292             && memcmp(cmap->red, color, sizeof(color)) == 0
 293             && memcmp(cmap->green, color, sizeof(color)) == 0
 294             && memcmp(cmap->blue, color, sizeof(color)) == 0
 295             && cmap->transp == NULL)
 296                 return 0;
 297         else
 298                 return -EINVAL;
 299 }
 300
 301 static int aafb_ioctl(struct fb_info *info, u32 cmd, unsigned long arg)
 302 {
 303         /* TODO: Not yet implemented */
 304         return -ENOIOCTLCMD;
 305 }
 306
 307 static int aafb_switch(int con, struct fb_info *info)
 308 {
 309         struct aafb_info *ip = (struct aafb_info *)info;
 310         struct display *old = (currcon < 0) ? &ip->disp : (fb_display + currcon);
 311         struct display *new = (con < 0) ? &ip->disp : (fb_display + con);
 312
 313         if (old->conp && old->conp->vc_sw && old->conp->vc_sw->con_cursor)
 314                 old->conp->vc_sw->con_cursor(old->conp, CM_ERASE);
 315
 316         /* Set the current console. */
 317         currcon = con;
 318         aafb_set_disp(new, con, ip);
 319
 320         return 0;
 321 }
 322
 323 static void aafb_encode_var(struct fb_var_screeninfo *var,
 324                             struct aafb_par *par)
 325 {
 326         var->xres = 1280;
 327         var->yres = 1024;
 328         var->xres_virtual = 2048;
 329         var->yres_virtual = 1024;
 330         var->xoffset = 0;
 331         var->yoffset = 0;
 332         var->bits_per_pixel = 8;
 333         var->grayscale = 1;
 334         var->red.offset = 0;
 335         var->red.length = 0;
 336         var->red.msb_right = 0;
 337         var->green.offset = 0;
 338         var->green.length = 1;
 339         var->green.msb_right = 0;
 340         var->blue.offset = 0;
 341         var->blue.length = 0;
 342         var->blue.msb_right = 0;
 343         var->transp.offset = 0;
 344         var->transp.length = 0;
 345         var->transp.msb_right = 0;
 346         var->nonstd = 0;
 347         var->activate &= ~FB_ACTIVATE_MASK & FB_ACTIVATE_NOW;
 348         var->accel_flags = 0;
 349         var->sync = FB_SYNC_ON_GREEN;
 350         var->vmode &= ~FB_VMODE_MASK & FB_VMODE_NONINTERLACED;
 351 }
 352
 353 static int aafb_get_var(struct fb_var_screeninfo *var, int con,
 354                         struct fb_info *info)
 355 {
 356         if (con < 0) {
 357                 struct aafb_par par;
 358
 359                 memset(var, 0, sizeof(struct fb_var_screeninfo));
 360                 aafb_get_par(&par);
 361                 aafb_encode_var(var, &par);
 362         } else
 363                 *var = info->var;
 364
 365         return 0;
 366 }
 367
 368 static int aafb_set_var(struct fb_var_screeninfo *var, int con,
 369                         struct fb_info *info)
 370 {
 371         struct aafb_par par;
 372
 373         aafb_get_par(&par);
 374         aafb_encode_var(var, &par);
 375         info->var = *var;
 376
 377         return 0;
 378 }
 379
 380 static int aafb_update_var(int con, struct fb_info *info)
 381 {
 382         struct aafb_info *ip = (struct aafb_info *)info;
 383         struct display *disp = (con < 0) ? &ip->disp : (fb_display + con);
 384
 385         if (con == currcon)
 386                 aafbcon_cursor(disp, CM_ERASE, ip->cursor.x, ip->cursor.y);
 387
 388         return 0;
 389 }
 390
 391 /* 0 unblanks, any other blanks. */
 392
 393 static void aafb_blank(int blank, struct fb_info *info)
 394 {
 395         struct aafb_info *ip = (struct aafb_info *)info;
 396         u8 val = blank ? 0x00 : 0x0f;
 397
 398         bt455_write_cmap_entry(ip->bt455, 1, val, val, val);
 399         aafbcon_cursor(&ip->disp, CM_ERASE, ip->cursor.x, ip->cursor.y);
 400 }
 401
 402 static struct fb_ops aafb_ops = {
 403         .owner = THIS_MODULE,
 404         .fb_get_fix = aafb_get_fix,
 405         .fb_get_var = aafb_get_var,
 406         .fb_set_var = aafb_set_var,
 407         .fb_get_cmap = aafb_get_cmap,
 408         .fb_set_cmap = aafb_set_cmap,
 409         .fb_ioctl = aafb_ioctl
 410 };
 411
 412 static int __init init_one(int slot)
 413 {
 414         unsigned long base_addr = CKSEG1ADDR(get_tc_base_addr(slot));
 415         struct aafb_info *ip = &my_fb_info[slot];
 416
 417         memset(ip, 0, sizeof(struct aafb_info));
 418
 419         /*
 420          * Framebuffer display memory base address and friends.
 421          */
 422         ip->bt455 = (struct bt455_regs *) (base_addr + PMAG_AA_BT455_OFFSET);
 423         ip->bt431 = (struct bt431_regs *) (base_addr + PMAG_AA_BT431_OFFSET);
 424         ip->fb_start = base_addr + PMAG_AA_ONBOARD_FBMEM_OFFSET;
 425         ip->fb_size = 2048 * 1024; /* fb_fix_screeninfo.smem_length
 426                                       seems to be physical */
 427         ip->fb_line_length = 2048;
 428
 429         /*
 430          * Let there be consoles..
 431          */
 432         strcpy(ip->info.modename, "PMAG-AA");
 433         ip->info.node = -1;
 434         ip->info.flags = FBINFO_FLAG_DEFAULT;
 435         ip->info.fbops = &aafb_ops;
 436         ip->info.disp = &ip->disp;
 437         ip->info.changevar = NULL;
 438         ip->info.switch_con = &aafb_switch;
 439         ip->info.updatevar = &aafb_update_var;
 440         ip->info.blank = &aafb_blank;
 441
 442         aafb_set_disp(&ip->disp, currcon, ip);
 443
 444         /*
 445          * Configure the RAM DACs.
 446          */
 447         bt455_erase_cursor(ip->bt455);
 448
 449         /* Init colormap. */
 450         bt455_write_cmap_entry(ip->bt455, 0, 0x00, 0x00, 0x00);
 451         bt455_write_cmap_entry(ip->bt455, 1, 0x0f, 0x0f, 0x0f);
 452
 453         /* Init hardware cursor. */
 454         bt431_init_cursor(ip->bt431);
 455         aafb_cursor_init(ip);
 456
 457         /* Clear the screen. */
 458         memset ((void *)ip->fb_start, 0, ip->fb_size);
 459
 460         if (register_framebuffer(&ip->info) < 0)
 461                 return -EINVAL;
 462
 463         printk(KERN_INFO "fb%d: %s frame buffer in TC slot %d\n",
 464                GET_FB_IDX(ip->info.node), ip->info.modename, slot);
 465
 466         return 0;
 467 }
 468
 469 static int __exit exit_one(int slot)
 470 {
 471         struct aafb_info *ip = &my_fb_info[slot];
 472
 473         if (unregister_framebuffer(&ip->info) < 0)
 474                 return -EINVAL;
 475
 476         return 0;
 477 }
 478
 479 /*
 480  * Initialise the framebuffer.
 481  */
 482 int __init pmagaafb_init(void)
 483 {
 484         int sid;
 485         int found = 0;
 486
 487         while ((sid = search_tc_card("PMAG-AA")) >= 0) {
 488                 found = 1;
 489                 claim_tc_card(sid);
 490                 init_one(sid);
 491         }
 492
 493         return found ? 0 : -ENXIO;
 494 }
 495
 496 static void __exit pmagaafb_exit(void)
 497 {
 498         int sid;
 499
 500         while ((sid = search_tc_card("PMAG-AA")) >= 0) {
 501                 exit_one(sid);
 502                 release_tc_card(sid);
 503         }
 504 }
 505
 506 MODULE_AUTHOR(DRIVER_AUTHOR);
 507 MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
 508 MODULE_LICENSE("GPL");
 509 #ifdef MODULE
 510 module_init(pmagaafb_init);
 511 module_exit(pmagaafb_exit);
 512 #endif