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