drivers/video/fbdev/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/macintosh.h>
  60 #else
  61 #include <asm/prom.h>
  62 #endif
  63 #include <asm/pgtable.h>
  64
  65 #include "macmodes.h"
  66 #include "valkyriefb.h"
  67
  68 #ifdef CONFIG_MAC
  69 /* We don't yet have functions to read the PRAM... perhaps we can
  70    adapt them from the PPC code? */
  71 static int default_vmode = VMODE_CHOOSE;
  72 static int default_cmode = CMODE_8;
  73 #else
  74 static int default_vmode = VMODE_NVRAM;
  75 static int default_cmode = CMODE_NVRAM;
  76 #endif
  77
  78 struct fb_par_valkyrie {
  79         int     vmode, cmode;
  80         int     xres, yres;
  81         int     vxres, vyres;
  82         struct valkyrie_regvals *init;
  83 };
  84
  85 struct fb_info_valkyrie {
  86         struct fb_info          info;
  87         struct fb_par_valkyrie  par;
  88         struct cmap_regs        __iomem *cmap_regs;
  89         unsigned long           cmap_regs_phys;
  90
  91         struct valkyrie_regs    __iomem *valkyrie_regs;
  92         unsigned long           valkyrie_regs_phys;
  93
  94         __u8                    __iomem *frame_buffer;
  95         unsigned long           frame_buffer_phys;
  96
  97         int                     sense;
  98         unsigned long           total_vram;
  99
 100         u32                     pseudo_palette[16];
 101 };
 102
 103 /*
 104  * Exported functions
 105  */
 106 int valkyriefb_init(void);
 107 int valkyriefb_setup(char*);
 108
 109 static int valkyriefb_check_var(struct fb_var_screeninfo *var,
 110                                 struct fb_info *info);
 111 static int valkyriefb_set_par(struct fb_info *info);
 112 static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 113                              u_int transp, struct fb_info *info);
 114 static int valkyriefb_blank(int blank_mode, struct fb_info *info);
 115
 116 static int read_valkyrie_sense(struct fb_info_valkyrie *p);
 117 static void set_valkyrie_clock(unsigned char *params);
 118 static int valkyrie_var_to_par(struct fb_var_screeninfo *var,
 119         struct fb_par_valkyrie *par, const struct fb_info *fb_info);
 120
 121 static int valkyrie_init_info(struct fb_info *info, struct fb_info_valkyrie *p);
 122 static void valkyrie_par_to_fix(struct fb_par_valkyrie *par, struct fb_fix_screeninfo *fix);
 123 static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p);
 124
 125 static struct fb_ops valkyriefb_ops = {
 126         .owner =        THIS_MODULE,
 127         .fb_check_var = valkyriefb_check_var,
 128         .fb_set_par =   valkyriefb_set_par,
 129         .fb_setcolreg = valkyriefb_setcolreg,
 130         .fb_blank =     valkyriefb_blank,
 131         .fb_fillrect    = cfb_fillrect,
 132         .fb_copyarea    = cfb_copyarea,
 133         .fb_imageblit   = cfb_imageblit,
 134 };
 135
 136 /* Sets the video mode according to info->var */
 137 static int valkyriefb_set_par(struct fb_info *info)
 138 {
 139         struct fb_info_valkyrie *p =
 140                 container_of(info, 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 =
 199                 container_of(info, 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 =
 232                 container_of(info, struct fb_info_valkyrie, info);
 233         volatile struct cmap_regs __iomem *cmap_regs = p->cmap_regs;
 234         struct fb_par_valkyrie *par = info->par;
 235
 236         if (regno > 255)
 237                 return 1;
 238         red >>= 8;
 239         green >>= 8;
 240         blue >>= 8;
 241
 242         /* tell clut which address to fill */
 243         out_8(&p->cmap_regs->addr, regno);
 244         udelay(1);
 245         /* send one color channel at a time */
 246         out_8(&cmap_regs->lut, red);
 247         out_8(&cmap_regs->lut, green);
 248         out_8(&cmap_regs->lut, blue);
 249
 250         if (regno < 16 && par->cmode == CMODE_16)
 251                 ((u32 *)info->pseudo_palette)[regno] =
 252                         (regno << 10) | (regno << 5) | regno;
 253
 254         return 0;
 255 }
 256
 257 static inline int valkyrie_vram_reqd(int video_mode, int color_mode)
 258 {
 259         int pitch;
 260         struct valkyrie_regvals *init = valkyrie_reg_init[video_mode-1];
 261
 262         if ((pitch = init->pitch[color_mode]) == 0)
 263                 pitch = 2 * init->pitch[0];
 264         return init->vres * pitch;
 265 }
 266
 267 static void set_valkyrie_clock(unsigned char *params)
 268 {
 269 #ifdef CONFIG_ADB_CUDA
 270         struct adb_request req;
 271         int i;
 272
 273         for (i = 0; i < 3; ++i) {
 274                 cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
 275                              0x50, i + 1, params[i]);
 276                 while (!req.complete)
 277                         cuda_poll();
 278         }
 279 #endif
 280 }
 281
 282 static void __init valkyrie_choose_mode(struct fb_info_valkyrie *p)
 283 {
 284         p->sense = read_valkyrie_sense(p);
 285         printk(KERN_INFO "Monitor sense value = 0x%x\n", p->sense);
 286
 287         /* Try to pick a video mode out of NVRAM if we have one. */
 288 #if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM)
 289         if (default_vmode == VMODE_NVRAM) {
 290                 default_vmode = nvram_read_byte(NV_VMODE);
 291                 if (default_vmode <= 0
 292                  || default_vmode > VMODE_MAX
 293                  || !valkyrie_reg_init[default_vmode - 1])
 294                         default_vmode = VMODE_CHOOSE;
 295         }
 296 #endif
 297         if (default_vmode == VMODE_CHOOSE)
 298                 default_vmode = mac_map_monitor_sense(p->sense);
 299         if (!valkyrie_reg_init[default_vmode - 1])
 300                 default_vmode = VMODE_640_480_67;
 301 #if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM)
 302         if (default_cmode == CMODE_NVRAM)
 303                 default_cmode = nvram_read_byte(NV_CMODE);
 304 #endif
 305
 306         /*
 307          * Reduce the pixel size if we don't have enough VRAM or bandwidth.
 308          */
 309         if (default_cmode < CMODE_8 || default_cmode > CMODE_16
 310             || valkyrie_reg_init[default_vmode-1]->pitch[default_cmode] == 0
 311             || valkyrie_vram_reqd(default_vmode, default_cmode) > p->total_vram)
 312                 default_cmode = CMODE_8;
 313
 314         printk(KERN_INFO "using video mode %d and color mode %d.\n",
 315                default_vmode, default_cmode);
 316 }
 317
 318 int __init valkyriefb_init(void)
 319 {
 320         struct fb_info_valkyrie *p;
 321         unsigned long frame_buffer_phys, cmap_regs_phys, flags;
 322         int err;
 323         char *option = NULL;
 324
 325         if (fb_get_options("valkyriefb", &option))
 326                 return -ENODEV;
 327         valkyriefb_setup(option);
 328
 329 #ifdef CONFIG_MAC
 330         if (!MACH_IS_MAC)
 331                 return -ENODEV;
 332         if (!(mac_bi_data.id == MAC_MODEL_Q630
 333               /* I'm not sure about this one */
 334             || mac_bi_data.id == MAC_MODEL_P588))
 335                 return -ENODEV;
 336
 337         /* Hardcoded addresses... welcome to 68k Macintosh country :-) */
 338         frame_buffer_phys = 0xf9000000;
 339         cmap_regs_phys = 0x50f24000;
 340         flags = IOMAP_NOCACHE_SER; /* IOMAP_WRITETHROUGH?? */
 341 #else /* ppc (!CONFIG_MAC) */
 342         {
 343                 struct device_node *dp;
 344                 struct resource r;
 345
 346                 dp = of_find_node_by_name(NULL, "valkyrie");
 347                 if (dp == 0)
 348                         return 0;
 349
 350                 if (of_address_to_resource(dp, 0, &r)) {
 351                         printk(KERN_ERR "can't find address for valkyrie\n");
 352                         return 0;
 353                 }
 354
 355                 frame_buffer_phys = r.start;
 356                 cmap_regs_phys = r.start + 0x304000;
 357                 flags = _PAGE_WRITETHRU;
 358         }
 359 #endif /* ppc (!CONFIG_MAC) */
 360
 361         p = kzalloc(sizeof(*p), GFP_ATOMIC);
 362         if (p == 0)
 363                 return -ENOMEM;
 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         err = valkyrie_init_info(&p->info, p);
 387         if (err < 0)
 388                 goto out_free;
 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_cmap_free;
 396
 397         fb_info(&p->info, "valkyrie frame buffer device\n");
 398         return 0;
 399
 400  out_cmap_free:
 401         fb_dealloc_cmap(&p->info.cmap);
 402  out_free:
 403         if (p->frame_buffer)
 404                 iounmap(p->frame_buffer);
 405         if (p->cmap_regs)
 406                 iounmap(p->cmap_regs);
 407         if (p->valkyrie_regs)
 408                 iounmap(p->valkyrie_regs);
 409         kfree(p);
 410         return err;
 411 }
 412
 413 /*
 414  * Get the monitor sense value.
 415  */
 416 static int read_valkyrie_sense(struct fb_info_valkyrie *p)
 417 {
 418         int sense, in;
 419
 420         out_8(&p->valkyrie_regs->msense.r, 0);   /* release all lines */
 421         __delay(20000);
 422         sense = ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x70) << 4;
 423         /* drive each sense line low in turn and collect the other 2 */
 424         out_8(&p->valkyrie_regs->msense.r, 4);   /* drive A low */
 425         __delay(20000);
 426         sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x30);
 427         out_8(&p->valkyrie_regs->msense.r, 2);   /* drive B low */
 428         __delay(20000);
 429         sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x40) >> 3;
 430         sense |= (in & 0x10) >> 2;
 431         out_8(&p->valkyrie_regs->msense.r, 1);   /* drive C low */
 432         __delay(20000);
 433         sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x60) >> 5;
 434
 435         out_8(&p->valkyrie_regs->msense.r, 7);
 436
 437         return sense;
 438 }
 439
 440 /*
 441  * This routine takes a user-supplied var,
 442  * and picks the best vmode/cmode from it.
 443  */
 444
 445 /* [bkn] I did a major overhaul of this function.
 446  *
 447  * Much of the old code was "swiped by jonh from atyfb.c". Because
 448  * macmodes has mac_var_to_vmode, I felt that it would be better to
 449  * rework this function to use that, instead of reinventing the wheel to
 450  * add support for vmode 17. This was reinforced by the fact that
 451  * the previously swiped atyfb.c code is no longer there.
 452  *
 453  * So, I swiped and adapted platinum_var_to_par (from platinumfb.c), replacing
 454  * most, but not all, of the old code in the process. One side benefit of
 455  * swiping the platinumfb code is that we now have more comprehensible error
 456  * messages when a vmode/cmode switch fails. (Most of the error messages are
 457  * platinumfb.c, but I added two of my own, and I also changed some commas
 458  * into colons to make the messages more consistent with other Linux error
 459  * messages.) In addition, I think the new code *might* fix some vmode-
 460  * switching oddities, but I'm not sure.
 461  *
 462  * There may be some more opportunities for cleanup in here, but this is a
 463  * good start...
 464  */
 465
 466 static int valkyrie_var_to_par(struct fb_var_screeninfo *var,
 467         struct fb_par_valkyrie *par, const struct fb_info *fb_info)
 468 {
 469         int vmode, cmode;
 470         struct valkyrie_regvals *init;
 471         struct fb_info_valkyrie *p =
 472                 container_of(fb_info, struct fb_info_valkyrie, info);
 473
 474         if (mac_var_to_vmode(var, &vmode, &cmode) != 0) {
 475                 printk(KERN_ERR "valkyriefb: can't do %dx%dx%d.\n",
 476                        var->xres, var->yres, var->bits_per_pixel);
 477                 return -EINVAL;
 478         }
 479
 480         /* Check if we know about the wanted video mode */
 481         if (vmode < 1 || vmode > VMODE_MAX || !valkyrie_reg_init[vmode-1]) {
 482                 printk(KERN_ERR "valkyriefb: vmode %d not valid.\n", vmode);
 483                 return -EINVAL;
 484         }
 485
 486         if (cmode != CMODE_8 && cmode != CMODE_16) {
 487                 printk(KERN_ERR "valkyriefb: cmode %d not valid.\n", cmode);
 488                 return -EINVAL;
 489         }
 490
 491         if (var->xres_virtual > var->xres || var->yres_virtual > var->yres
 492             || var->xoffset != 0 || var->yoffset != 0) {
 493                 return -EINVAL;
 494         }
 495
 496         init = valkyrie_reg_init[vmode-1];
 497         if (init->pitch[cmode] == 0) {
 498                 printk(KERN_ERR "valkyriefb: vmode %d does not support "
 499                        "cmode %d.\n", vmode, cmode);
 500                 return -EINVAL;
 501         }
 502
 503         if (valkyrie_vram_reqd(vmode, cmode) > p->total_vram) {
 504                 printk(KERN_ERR "valkyriefb: not enough ram for vmode %d, "
 505                        "cmode %d.\n", vmode, cmode);
 506                 return -EINVAL;
 507         }
 508
 509         par->vmode = vmode;
 510         par->cmode = cmode;
 511         par->init = init;
 512         par->xres = var->xres;
 513         par->yres = var->yres;
 514         par->vxres = par->xres;
 515         par->vyres = par->yres;
 516
 517         return 0;
 518 }
 519
 520 static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p)
 521 {
 522         memset(fix, 0, sizeof(*fix));
 523         strcpy(fix->id, "valkyrie");
 524         fix->mmio_start = p->valkyrie_regs_phys;
 525         fix->mmio_len = sizeof(struct valkyrie_regs);
 526         fix->type = FB_TYPE_PACKED_PIXELS;
 527         fix->smem_start = p->frame_buffer_phys + 0x1000;
 528         fix->smem_len = p->total_vram;
 529
 530         fix->type_aux = 0;
 531         fix->ywrapstep = 0;
 532         fix->ypanstep = 0;
 533         fix->xpanstep = 0;
 534
 535 }
 536
 537 /* Fix must already be inited above */
 538 static void valkyrie_par_to_fix(struct fb_par_valkyrie *par,
 539         struct fb_fix_screeninfo *fix)
 540 {
 541         fix->smem_len = valkyrie_vram_reqd(par->vmode, par->cmode);
 542         fix->visual = (par->cmode == CMODE_8) ?
 543                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
 544         fix->line_length = par->vxres << par->cmode;
 545                 /* ywrapstep, xpanstep, ypanstep */
 546 }
 547
 548 static int __init valkyrie_init_info(struct fb_info *info,
 549                 struct fb_info_valkyrie *p)
 550 {
 551         info->fbops = &valkyriefb_ops;
 552         info->screen_base = p->frame_buffer + 0x1000;
 553         info->flags = FBINFO_DEFAULT;
 554         info->pseudo_palette = p->pseudo_palette;
 555         info->par = &p->par;
 556         return fb_alloc_cmap(&info->cmap, 256, 0);
 557 }
 558
 559
 560 /*
 561  * Parse user specified options (`video=valkyriefb:')
 562  */
 563 int __init valkyriefb_setup(char *options)
 564 {
 565         char *this_opt;
 566
 567         if (!options || !*options)
 568                 return 0;
 569
 570         while ((this_opt = strsep(&options, ",")) != NULL) {
 571                 if (!strncmp(this_opt, "vmode:", 6)) {
 572                         int vmode = simple_strtoul(this_opt+6, NULL, 0);
 573                         if (vmode > 0 && vmode <= VMODE_MAX)
 574                                 default_vmode = vmode;
 575                 }
 576                 else if (!strncmp(this_opt, "cmode:", 6)) {
 577                         int depth = simple_strtoul(this_opt+6, NULL, 0);
 578                         switch (depth) {
 579                         case 8:
 580                                 default_cmode = CMODE_8;
 581                                 break;
 582                         case 15:
 583                         case 16:
 584                                 default_cmode = CMODE_16;
 585                                 break;
 586                         }
 587                 }
 588         }
 589         return 0;
 590 }
 591
 592 module_init(valkyriefb_init);
 593 MODULE_LICENSE("GPL");