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