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