drivers/video/valkyriefb.c

   1 /*
   2  *  valkyriefb.c -- frame buffer device for the PowerMac 'valkyrie' display
   3  *
   4  *  Created 8 August 1998 by
   5  *  Martin Costabel <costabel@wanadoo.fr> and Kevin Schoedel
   6  *
   7  *  Vmode-switching changes and vmode 15/17 modifications created 29 August
   8  *  1998 by Barry K. Nathan <barryn@pobox.com>.
   9  *
  10  *  Ported to m68k Macintosh by David Huggins-Daines <dhd@debian.org>
  11  *
  12  *  Derived directly from:
  13  *
  14  *   controlfb.c -- frame buffer device for the PowerMac 'control' display
  15  *   Copyright (C) 1998 Dan Jacobowitz <dan@debian.org>
  16  *
  17  *   pmc-valkyrie.c -- Console support for PowerMac "valkyrie" display adaptor.
  18  *   Copyright (C) 1997 Paul Mackerras.
  19  *
  20  *  and indirectly:
  21  *
  22  *  Frame buffer structure from:
  23  *    drivers/video/chipsfb.c -- frame buffer device for
  24  *    Chips & Technologies 65550 chip.
  25  *
  26  *    Copyright (C) 1998 Paul Mackerras
  27  *
  28  *    This file is derived from the Powermac "chips" driver:
  29  *    Copyright (C) 1997 Fabio Riccardi.
  30  *    And from the frame buffer device for Open Firmware-initialized devices:
  31  *    Copyright (C) 1997 Geert Uytterhoeven.
  32  *
  33  *  Hardware information from:
  34  *    control.c: Console support for PowerMac "control" display adaptor.
  35  *    Copyright (C) 1996 Paul Mackerras
  36  *
  37  *  This file is subject to the terms and conditions of the GNU General Public
  38  *  License. See the file COPYING in the main directory of this archive for
  39  *  more details.
  40  */
  41
  42 #include <linux/config.h>
  43 #include <linux/module.h>
  44 #include <linux/kernel.h>
  45 #include <linux/errno.h>
  46 #include <linux/string.h>
  47 #include <linux/mm.h>
  48 #include <linux/tty.h>
  49 #include <linux/slab.h>
  50 #include <linux/vmalloc.h>
  51 #include <linux/delay.h>
  52 #include <linux/interrupt.h>
  53 #include <linux/fb.h>
  54 #include <linux/selection.h>
  55 #include <linux/init.h>
  56 #include <linux/pci.h>
  57 #include <linux/nvram.h>
  58 #include <linux/adb.h>
  59 #include <linux/cuda.h>
  60 #include <asm/io.h>
  61 #ifdef CONFIG_MAC
  62 #include <asm/bootinfo.h>
  63 #include <asm/macintosh.h>
  64 #else
  65 #include <asm/prom.h>
  66 #endif
  67 #include <asm/pgtable.h>
  68
  69 #include "macmodes.h"
  70 #include "valkyriefb.h"
  71
  72 #ifdef CONFIG_MAC
  73 /* We don't yet have functions to read the PRAM... perhaps we can
  74    adapt them from the PPC code? */
  75 static int default_vmode = VMODE_640_480_67;
  76 static int default_cmode = CMODE_8;
  77 #else
  78 static int default_vmode = VMODE_NVRAM;
  79 static int default_cmode = CMODE_NVRAM;
  80 #endif
  81
  82 struct fb_par_valkyrie {
  83         int     vmode, cmode;
  84         int     xres, yres;
  85         int     vxres, vyres;
  86         struct valkyrie_regvals *init;
  87 };
  88
  89 struct fb_info_valkyrie {
  90         struct fb_info          info;
  91         struct fb_par_valkyrie  par;
  92         struct cmap_regs        __iomem *cmap_regs;
  93         unsigned long           cmap_regs_phys;
  94
  95         struct valkyrie_regs    __iomem *valkyrie_regs;
  96         unsigned long           valkyrie_regs_phys;
  97
  98         __u8                    __iomem *frame_buffer;
  99         unsigned long           frame_buffer_phys;
 100
 101         int                     sense;
 102         unsigned long           total_vram;
 103
 104         u32                     pseudo_palette[16];
 105 };
 106
 107 /*
 108  * Exported functions
 109  */
 110 int valkyriefb_init(void);
 111 int valkyriefb_setup(char*);
 112
 113 static int valkyriefb_check_var(struct fb_var_screeninfo *var,
 114                                 struct fb_info *info);
 115 static int valkyriefb_set_par(struct fb_info *info);
 116 static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 117                              u_int transp, struct fb_info *info);
 118 static int valkyriefb_blank(int blank_mode, struct fb_info *info);
 119
 120 static int read_valkyrie_sense(struct fb_info_valkyrie *p);
 121 static void set_valkyrie_clock(unsigned char *params);
 122 static int valkyrie_var_to_par(struct fb_var_screeninfo *var,
 123         struct fb_par_valkyrie *par, const struct fb_info *fb_info);
 124
 125 static void valkyrie_init_info(struct fb_info *info, struct fb_info_valkyrie *p);
 126 static void valkyrie_par_to_fix(struct fb_par_valkyrie *par, struct fb_fix_screeninfo *fix);
 127 static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p);
 128
 129 static struct fb_ops valkyriefb_ops = {
 130         .owner =        THIS_MODULE,
 131         .fb_check_var = valkyriefb_check_var,
 132         .fb_set_par =   valkyriefb_set_par,
 133         .fb_setcolreg = valkyriefb_setcolreg,
 134         .fb_blank =     valkyriefb_blank,
 135         .fb_fillrect    = cfb_fillrect,
 136         .fb_copyarea    = cfb_copyarea,
 137         .fb_imageblit   = cfb_imageblit,
 138 };
 139
 140 /* Sets the video mode according to info->var */
 141 static int valkyriefb_set_par(struct fb_info *info)
 142 {
 143         struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) info;
 144         volatile struct valkyrie_regs __iomem *valkyrie_regs = p->valkyrie_regs;
 145         struct fb_par_valkyrie *par = info->par;
 146         struct valkyrie_regvals *init;
 147         int err;
 148
 149         if ((err = valkyrie_var_to_par(&info->var, par, info)))
 150                 return err;
 151
 152         valkyrie_par_to_fix(par, &info->fix);
 153
 154         /* Reset the valkyrie */
 155         out_8(&valkyrie_regs->status.r, 0);
 156         udelay(100);
 157
 158         /* Initialize display timing registers */
 159         init = par->init;
 160         out_8(&valkyrie_regs->mode.r, init->mode | 0x80);
 161         out_8(&valkyrie_regs->depth.r, par->cmode + 3);
 162         set_valkyrie_clock(init->clock_params);
 163         udelay(100);
 164
 165         /* Turn on display */
 166         out_8(&valkyrie_regs->mode.r, init->mode);
 167
 168         return 0;
 169 }
 170
 171 static inline int valkyrie_par_to_var(struct fb_par_valkyrie *par,
 172                                       struct fb_var_screeninfo *var)
 173 {
 174         return mac_vmode_to_var(par->vmode, par->cmode, var);
 175 }
 176
 177 static int
 178 valkyriefb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 179 {
 180         int err;
 181         struct fb_par_valkyrie par;
 182
 183         if ((err = valkyrie_var_to_par(var, &par, info)))
 184                 return err;
 185         valkyrie_par_to_var(&par, var);
 186         return 0;
 187 }
 188
 189 /*
 190  *  Blank the screen if blank_mode != 0, else unblank. If blank_mode == NULL
 191  *  then the caller blanks by setting the CLUT (Color Look Up Table) to all
 192  *  black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
 193  *  to e.g. a video mode which doesn't support it. Implements VESA suspend
 194  *  and powerdown modes on hardware that supports disabling hsync/vsync:
 195  *    blank_mode == 2: suspend vsync
 196  *    blank_mode == 3: suspend hsync
 197  *    blank_mode == 4: powerdown
 198  */
 199 static int valkyriefb_blank(int blank_mode, struct fb_info *info)
 200 {
 201         struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) info;
 202         struct fb_par_valkyrie *par = info->par;
 203         struct valkyrie_regvals *init = par->init;
 204
 205         if (init == NULL)
 206                 return 1;
 207
 208         switch (blank_mode) {
 209         case FB_BLANK_UNBLANK:                  /* unblank */
 210                 out_8(&p->valkyrie_regs->mode.r, init->mode);
 211                 break;
 212         case FB_BLANK_NORMAL:
 213                 return 1;       /* get caller to set CLUT to all black */
 214         case FB_BLANK_VSYNC_SUSPEND:
 215         case FB_BLANK_HSYNC_SUSPEND:
 216                 /*
 217                  * [kps] Value extracted from MacOS. I don't know
 218                  * whether this bit disables hsync or vsync, or
 219                  * whether the hardware can do the other as well.
 220                  */
 221                 out_8(&p->valkyrie_regs->mode.r, init->mode | 0x40);
 222                 break;
 223         case FB_BLANK_POWERDOWN:
 224                 out_8(&p->valkyrie_regs->mode.r, 0x66);
 225                 break;
 226         }
 227         return 0;
 228 }
 229
 230 static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 231                              u_int transp, struct fb_info *info)
 232 {
 233         struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) info;
 234         volatile struct cmap_regs __iomem *cmap_regs = p->cmap_regs;
 235         struct fb_par_valkyrie *par = info->par;
 236
 237         if (regno > 255)
 238                 return 1;
 239         red >>= 8;
 240         green >>= 8;
 241         blue >>= 8;
 242
 243         /* tell clut which address to fill */
 244         out_8(&p->cmap_regs->addr, regno);
 245         udelay(1);
 246         /* send one color channel at a time */
 247         out_8(&cmap_regs->lut, red);
 248         out_8(&cmap_regs->lut, green);
 249         out_8(&cmap_regs->lut, blue);
 250
 251         if (regno < 16 && par->cmode == CMODE_16)
 252                 ((u32 *)info->pseudo_palette)[regno] =
 253                         (regno << 10) | (regno << 5) | regno;
 254
 255         return 0;
 256 }
 257
 258 static inline int valkyrie_vram_reqd(int video_mode, int color_mode)
 259 {
 260         int pitch;
 261         struct valkyrie_regvals *init = valkyrie_reg_init[video_mode-1];
 262
 263         if ((pitch = init->pitch[color_mode]) == 0)
 264                 pitch = 2 * init->pitch[0];
 265         return init->vres * pitch;
 266 }
 267
 268 static void set_valkyrie_clock(unsigned char *params)
 269 {
 270         struct adb_request req;
 271         int i;
 272
 273 #ifdef CONFIG_ADB_CUDA
 274         for (i = 0; i < 3; ++i) {
 275                 cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
 276                              0x50, i + 1, params[i]);
 277                 while (!req.complete)
 278                         cuda_poll();
 279         }
 280 #endif
 281 }
 282
 283 static void __init valkyrie_choose_mode(struct fb_info_valkyrie *p)
 284 {
 285         p->sense = read_valkyrie_sense(p);
 286         printk(KERN_INFO "Monitor sense value = 0x%x\n", p->sense);
 287
 288         /* Try to pick a video mode out of NVRAM if we have one. */
 289 #ifndef CONFIG_MAC
 290         if (default_vmode == VMODE_NVRAM) {
 291                 default_vmode = nvram_read_byte(NV_VMODE);
 292                 if (default_vmode <= 0
 293                  || default_vmode > VMODE_MAX
 294                  || !valkyrie_reg_init[default_vmode - 1])
 295                         default_vmode = VMODE_CHOOSE;
 296         }
 297 #endif
 298         if (default_vmode == VMODE_CHOOSE)
 299                 default_vmode = mac_map_monitor_sense(p->sense);
 300         if (!valkyrie_reg_init[default_vmode - 1])
 301                 default_vmode = VMODE_640_480_67;
 302 #ifndef CONFIG_MAC
 303         if (default_cmode == CMODE_NVRAM)
 304                 default_cmode = nvram_read_byte(NV_CMODE);
 305 #endif
 306
 307         /*
 308          * Reduce the pixel size if we don't have enough VRAM or bandwidth.
 309          */
 310         if (default_cmode < CMODE_8 || default_cmode > CMODE_16
 311             || valkyrie_reg_init[default_vmode-1]->pitch[default_cmode] == 0
 312             || valkyrie_vram_reqd(default_vmode, default_cmode) > p->total_vram)
 313                 default_cmode = CMODE_8;
 314
 315         printk(KERN_INFO "using video mode %d and color mode %d.\n",
 316                default_vmode, default_cmode);
 317 }
 318
 319 int __init valkyriefb_init(void)
 320 {
 321         struct fb_info_valkyrie *p;
 322         unsigned long frame_buffer_phys, cmap_regs_phys, flags;
 323         int err;
 324         char *option = NULL;
 325
 326         if (fb_get_options("valkyriefb", &option))
 327                 return -ENODEV;
 328         valkyriefb_setup(option);
 329
 330 #ifdef CONFIG_MAC
 331         if (!MACH_IS_MAC)
 332                 return 0;
 333         if (!(mac_bi_data.id == MAC_MODEL_Q630
 334               /* I'm not sure about this one */
 335             || mac_bi_data.id == MAC_MODEL_P588))
 336                 return 0;
 337
 338         /* Hardcoded addresses... welcome to 68k Macintosh country :-) */
 339         frame_buffer_phys = 0xf9000000;
 340         cmap_regs_phys = 0x50f24000;
 341         flags = IOMAP_NOCACHE_SER; /* IOMAP_WRITETHROUGH?? */
 342 #else /* ppc (!CONFIG_MAC) */
 343         {
 344                 struct device_node *dp;
 345                 struct resource r;
 346
 347                 dp = of_find_node_by_name(NULL, "valkyrie");
 348                 if (dp == 0)
 349                         return 0;
 350
 351                 if (of_address_to_resource(dp, 0, &r)) {
 352                         printk(KERN_ERR "can't find address for valkyrie\n");
 353                         return 0;
 354                 }
 355
 356                 frame_buffer_phys = r.start;
 357                 cmap_regs_phys = r.start + 0x304000;
 358                 flags = _PAGE_WRITETHRU;
 359         }
 360 #endif /* ppc (!CONFIG_MAC) */
 361
 362         p = kmalloc(sizeof(*p), GFP_ATOMIC);
 363         if (p == 0)
 364                 return -ENOMEM;
 365         memset(p, 0, sizeof(*p));
 366
 367         /* Map in frame buffer and registers */
 368         if (!request_mem_region(frame_buffer_phys, 0x100000, "valkyriefb")) {
 369                 kfree(p);
 370                 return 0;
 371         }
 372         p->total_vram = 0x100000;
 373         p->frame_buffer_phys = frame_buffer_phys;
 374         p->frame_buffer = __ioremap(frame_buffer_phys, p->total_vram, flags);
 375         p->cmap_regs_phys = cmap_regs_phys;
 376         p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
 377         p->valkyrie_regs_phys = cmap_regs_phys+0x6000;
 378         p->valkyrie_regs = ioremap(p->valkyrie_regs_phys, 0x1000);
 379         err = -ENOMEM;
 380         if (p->frame_buffer == NULL || p->cmap_regs == NULL
 381             || p->valkyrie_regs == NULL) {
 382                 printk(KERN_ERR "valkyriefb: couldn't map resources\n");
 383                 goto out_free;
 384         }
 385
 386         valkyrie_choose_mode(p);
 387         mac_vmode_to_var(default_vmode, default_cmode, &p->info.var);
 388         valkyrie_init_info(&p->info, p);
 389         valkyrie_init_fix(&p->info.fix, p);
 390         if (valkyriefb_set_par(&p->info))
 391                 /* "can't happen" */
 392                 printk(KERN_ERR "valkyriefb: can't set default video mode\n");
 393
 394         if ((err = register_framebuffer(&p->info)) != 0)
 395                 goto out_free;
 396
 397         printk(KERN_INFO "fb%d: valkyrie frame buffer device\n", p->info.node);
 398         return 0;
 399
 400  out_free:
 401         if (p->frame_buffer)
 402                 iounmap(p->frame_buffer);
 403         if (p->cmap_regs)
 404                 iounmap(p->cmap_regs);
 405         if (p->valkyrie_regs)
 406                 iounmap(p->valkyrie_regs);
 407         kfree(p);
 408         return err;
 409 }
 410
 411 /*
 412  * Get the monitor sense value.
 413  */
 414 static int read_valkyrie_sense(struct fb_info_valkyrie *p)
 415 {
 416         int sense, in;
 417
 418         out_8(&p->valkyrie_regs->msense.r, 0);   /* release all lines */
 419         __delay(20000);
 420         sense = ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x70) << 4;
 421         /* drive each sense line low in turn and collect the other 2 */
 422         out_8(&p->valkyrie_regs->msense.r, 4);   /* drive A low */
 423         __delay(20000);
 424         sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x30);
 425         out_8(&p->valkyrie_regs->msense.r, 2);   /* drive B low */
 426         __delay(20000);
 427         sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x40) >> 3;
 428         sense |= (in & 0x10) >> 2;
 429         out_8(&p->valkyrie_regs->msense.r, 1);   /* drive C low */
 430         __delay(20000);
 431         sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x60) >> 5;
 432
 433         out_8(&p->valkyrie_regs->msense.r, 7);
 434
 435         return sense;
 436 }
 437
 438 /*
 439  * This routine takes a user-supplied var,
 440  * and picks the best vmode/cmode from it.
 441  */
 442
 443 /* [bkn] I did a major overhaul of this function.
 444  *
 445  * Much of the old code was "swiped by jonh from atyfb.c". Because
 446  * macmodes has mac_var_to_vmode, I felt that it would be better to
 447  * rework this function to use that, instead of reinventing the wheel to
 448  * add support for vmode 17. This was reinforced by the fact that
 449  * the previously swiped atyfb.c code is no longer there.
 450  *
 451  * So, I swiped and adapted platinum_var_to_par (from platinumfb.c), replacing
 452  * most, but not all, of the old code in the process. One side benefit of
 453  * swiping the platinumfb code is that we now have more comprehensible error
 454  * messages when a vmode/cmode switch fails. (Most of the error messages are
 455  * platinumfb.c, but I added two of my own, and I also changed some commas
 456  * into colons to make the messages more consistent with other Linux error
 457  * messages.) In addition, I think the new code *might* fix some vmode-
 458  * switching oddities, but I'm not sure.
 459  *
 460  * There may be some more opportunities for cleanup in here, but this is a
 461  * good start...
 462  */
 463
 464 static int valkyrie_var_to_par(struct fb_var_screeninfo *var,
 465         struct fb_par_valkyrie *par, const struct fb_info *fb_info)
 466 {
 467         int vmode, cmode;
 468         struct valkyrie_regvals *init;
 469         struct fb_info_valkyrie *p = (struct fb_info_valkyrie *) fb_info;
 470
 471         if (mac_var_to_vmode(var, &vmode, &cmode) != 0) {
 472                 printk(KERN_ERR "valkyriefb: can't do %dx%dx%d.\n",
 473                        var->xres, var->yres, var->bits_per_pixel);
 474                 return -EINVAL;
 475         }
 476
 477         /* Check if we know about the wanted video mode */
 478         if (vmode < 1 || vmode > VMODE_MAX || !valkyrie_reg_init[vmode-1]) {
 479                 printk(KERN_ERR "valkyriefb: vmode %d not valid.\n", vmode);
 480                 return -EINVAL;
 481         }
 482
 483         if (cmode != CMODE_8 && cmode != CMODE_16) {
 484                 printk(KERN_ERR "valkyriefb: cmode %d not valid.\n", cmode);
 485                 return -EINVAL;
 486         }
 487
 488         if (var->xres_virtual > var->xres || var->yres_virtual > var->yres
 489             || var->xoffset != 0 || var->yoffset != 0) {
 490                 return -EINVAL;
 491         }
 492
 493         init = valkyrie_reg_init[vmode-1];
 494         if (init->pitch[cmode] == 0) {
 495                 printk(KERN_ERR "valkyriefb: vmode %d does not support "
 496                        "cmode %d.\n", vmode, cmode);
 497                 return -EINVAL;
 498         }
 499
 500         if (valkyrie_vram_reqd(vmode, cmode) > p->total_vram) {
 501                 printk(KERN_ERR "valkyriefb: not enough ram for vmode %d, "
 502                        "cmode %d.\n", vmode, cmode);
 503                 return -EINVAL;
 504         }
 505
 506         par->vmode = vmode;
 507         par->cmode = cmode;
 508         par->init = init;
 509         par->xres = var->xres;
 510         par->yres = var->yres;
 511         par->vxres = par->xres;
 512         par->vyres = par->yres;
 513
 514         return 0;
 515 }
 516
 517 static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p)
 518 {
 519         memset(fix, 0, sizeof(*fix));
 520         strcpy(fix->id, "valkyrie");
 521         fix->mmio_start = p->valkyrie_regs_phys;
 522         fix->mmio_len = sizeof(struct valkyrie_regs);
 523         fix->type = FB_TYPE_PACKED_PIXELS;
 524         fix->smem_start = p->frame_buffer_phys + 0x1000;
 525         fix->smem_len = p->total_vram;
 526
 527         fix->type_aux = 0;
 528         fix->ywrapstep = 0;
 529         fix->ypanstep = 0;
 530         fix->xpanstep = 0;
 531
 532 }
 533
 534 /* Fix must already be inited above */
 535 static void valkyrie_par_to_fix(struct fb_par_valkyrie *par,
 536         struct fb_fix_screeninfo *fix)
 537 {
 538         fix->smem_len = valkyrie_vram_reqd(par->vmode, par->cmode);
 539         fix->visual = (par->cmode == CMODE_8) ?
 540                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
 541         fix->line_length = par->vxres << par->cmode;
 542                 /* ywrapstep, xpanstep, ypanstep */
 543 }
 544
 545 static void __init valkyrie_init_info(struct fb_info *info, struct fb_info_valkyrie *p)
 546 {
 547         info->fbops = &valkyriefb_ops;
 548         info->screen_base = p->frame_buffer + 0x1000;
 549         info->flags = FBINFO_DEFAULT;
 550         info->pseudo_palette = p->pseudo_palette;
 551         fb_alloc_cmap(&info->cmap, 256, 0);
 552         info->par = &p->par;
 553 }
 554
 555
 556 /*
 557  * Parse user speficied options (`video=valkyriefb:')
 558  */
 559 int __init valkyriefb_setup(char *options)
 560 {
 561         char *this_opt;
 562
 563         if (!options || !*options)
 564                 return 0;
 565
 566         while ((this_opt = strsep(&options, ",")) != NULL) {
 567                 if (!strncmp(this_opt, "vmode:", 6)) {
 568                         int vmode = simple_strtoul(this_opt+6, NULL, 0);
 569                         if (vmode > 0 && vmode <= VMODE_MAX)
 570                                 default_vmode = vmode;
 571                 }
 572                 else if (!strncmp(this_opt, "cmode:", 6)) {
 573                         int depth = simple_strtoul(this_opt+6, NULL, 0);
 574                         switch (depth) {
 575                         case 8:
 576                                 default_cmode = CMODE_8;
 577                                 break;
 578                         case 15:
 579                         case 16:
 580                                 default_cmode = CMODE_16;
 581                                 break;
 582                         }
 583                 }
 584         }
 585         return 0;
 586 }
 587
 588 module_init(valkyriefb_init);
 589 MODULE_LICENSE("GPL");