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