linux/drivers/video/valkyriefb.c
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   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? */
  72static int default_vmode = VMODE_CHOOSE;
  73static int default_cmode = CMODE_8;
  74#else
  75static int default_vmode = VMODE_NVRAM;
  76static int default_cmode = CMODE_NVRAM;
  77#endif
  78
  79struct fb_par_valkyrie {
  80        int     vmode, cmode;
  81        int     xres, yres;
  82        int     vxres, vyres;
  83        struct valkyrie_regvals *init;
  84};
  85
  86struct 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 */
 107int valkyriefb_init(void);
 108int valkyriefb_setup(char*);
 109
 110static int valkyriefb_check_var(struct fb_var_screeninfo *var,
 111                                struct fb_info *info);
 112static int valkyriefb_set_par(struct fb_info *info);
 113static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 114                             u_int transp, struct fb_info *info);
 115static int valkyriefb_blank(int blank_mode, struct fb_info *info);
 116
 117static int read_valkyrie_sense(struct fb_info_valkyrie *p);
 118static void set_valkyrie_clock(unsigned char *params);
 119static int valkyrie_var_to_par(struct fb_var_screeninfo *var,
 120        struct fb_par_valkyrie *par, const struct fb_info *fb_info);
 121
 122static int valkyrie_init_info(struct fb_info *info, struct fb_info_valkyrie *p);
 123static void valkyrie_par_to_fix(struct fb_par_valkyrie *par, struct fb_fix_screeninfo *fix);
 124static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p);
 125
 126static 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 */
 138static 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
 168static 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
 174static int
 175valkyriefb_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 */
 196static 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
 227static 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
 255static 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
 265static 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
 280static 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
 316int __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 -ENODEV;
 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 -ENODEV;
 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 = kzalloc(sizeof(*p), GFP_ATOMIC);
 360        if (p == 0)
 361                return -ENOMEM;
 362
 363        /* Map in frame buffer and registers */
 364        if (!request_mem_region(frame_buffer_phys, 0x100000, "valkyriefb")) {
 365                kfree(p);
 366                return 0;
 367        }
 368        p->total_vram = 0x100000;
 369        p->frame_buffer_phys = frame_buffer_phys;
 370        p->frame_buffer = __ioremap(frame_buffer_phys, p->total_vram, flags);
 371        p->cmap_regs_phys = cmap_regs_phys;
 372        p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
 373        p->valkyrie_regs_phys = cmap_regs_phys+0x6000;
 374        p->valkyrie_regs = ioremap(p->valkyrie_regs_phys, 0x1000);
 375        err = -ENOMEM;
 376        if (p->frame_buffer == NULL || p->cmap_regs == NULL
 377            || p->valkyrie_regs == NULL) {
 378                printk(KERN_ERR "valkyriefb: couldn't map resources\n");
 379                goto out_free;
 380        }
 381
 382        valkyrie_choose_mode(p);
 383        mac_vmode_to_var(default_vmode, default_cmode, &p->info.var);
 384        err = valkyrie_init_info(&p->info, p);
 385        if (err < 0)
 386                goto out_free;
 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_cmap_free;
 394
 395        printk(KERN_INFO "fb%d: valkyrie frame buffer device\n", p->info.node);
 396        return 0;
 397
 398 out_cmap_free:
 399        fb_dealloc_cmap(&p->info.cmap);
 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 */
 414static 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
 464static 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
 517static 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 */
 535static 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
 545static int __init valkyrie_init_info(struct fb_info *info,
 546                struct fb_info_valkyrie *p)
 547{
 548        info->fbops = &valkyriefb_ops;
 549        info->screen_base = p->frame_buffer + 0x1000;
 550        info->flags = FBINFO_DEFAULT;
 551        info->pseudo_palette = p->pseudo_palette;
 552        info->par = &p->par;
 553        return fb_alloc_cmap(&info->cmap, 256, 0);
 554}
 555
 556
 557/*
 558 * Parse user specified options (`video=valkyriefb:')
 559 */
 560int __init valkyriefb_setup(char *options)
 561{
 562        char *this_opt;
 563
 564        if (!options || !*options)
 565                return 0;
 566
 567        while ((this_opt = strsep(&options, ",")) != NULL) {
 568                if (!strncmp(this_opt, "vmode:", 6)) {
 569                        int vmode = simple_strtoul(this_opt+6, NULL, 0);
 570                        if (vmode > 0 && vmode <= VMODE_MAX)
 571                                default_vmode = vmode;
 572                }
 573                else if (!strncmp(this_opt, "cmode:", 6)) {
 574                        int depth = simple_strtoul(this_opt+6, NULL, 0);
 575                        switch (depth) {
 576                        case 8:
 577                                default_cmode = CMODE_8;
 578                                break;
 579                        case 15:
 580                        case 16:
 581                                default_cmode = CMODE_16;
 582                                break;
 583                        }
 584                }
 585        }
 586        return 0;
 587}
 588
 589module_init(valkyriefb_init);
 590MODULE_LICENSE("GPL");
 591
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