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