linux/drivers/video/controlfb.c
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   1/*
   2 *  controlfb.c -- frame buffer device for the PowerMac 'control' display
   3 *
   4 *  Created 12 July 1998 by Dan Jacobowitz <dan@debian.org>
   5 *  Copyright (C) 1998 Dan Jacobowitz
   6 *  Copyright (C) 2001 Takashi Oe
   7 *
   8 *  Mmap code by Michel Lanners <mlan@cpu.lu>
   9 *
  10 *  Frame buffer structure from:
  11 *    drivers/video/chipsfb.c -- frame buffer device for
  12 *    Chips & Technologies 65550 chip.
  13 *
  14 *    Copyright (C) 1998 Paul Mackerras
  15 *
  16 *    This file is derived from the Powermac "chips" driver:
  17 *    Copyright (C) 1997 Fabio Riccardi.
  18 *    And from the frame buffer device for Open Firmware-initialized devices:
  19 *    Copyright (C) 1997 Geert Uytterhoeven.
  20 *
  21 *  Hardware information from:
  22 *    control.c: Console support for PowerMac "control" display adaptor.
  23 *    Copyright (C) 1996 Paul Mackerras
  24 *
  25 *  Updated to 2.5 framebuffer API by Ben Herrenschmidt
  26 *  <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>,
  27 *  and James Simmons <jsimmons@infradead.org>.
  28 *
  29 *  This file is subject to the terms and conditions of the GNU General Public
  30 *  License. See the file COPYING in the main directory of this archive for
  31 *  more details.
  32 */
  33
  34#include <linux/module.h>
  35#include <linux/kernel.h>
  36#include <linux/errno.h>
  37#include <linux/string.h>
  38#include <linux/mm.h>
  39#include <linux/slab.h>
  40#include <linux/vmalloc.h>
  41#include <linux/delay.h>
  42#include <linux/interrupt.h>
  43#include <linux/fb.h>
  44#include <linux/init.h>
  45#include <linux/pci.h>
  46#include <linux/nvram.h>
  47#include <linux/adb.h>
  48#include <linux/cuda.h>
  49#include <asm/io.h>
  50#include <asm/prom.h>
  51#include <asm/pgtable.h>
  52#include <asm/btext.h>
  53
  54#include "macmodes.h"
  55#include "controlfb.h"
  56
  57struct fb_par_control {
  58        int     vmode, cmode;
  59        int     xres, yres;
  60        int     vxres, vyres;
  61        int     xoffset, yoffset;
  62        int     pitch;
  63        struct control_regvals  regvals;
  64        unsigned long sync;
  65        unsigned char ctrl;
  66};
  67
  68#define DIRTY(z) ((x)->z != (y)->z)
  69#define DIRTY_CMAP(z) (memcmp(&((x)->z), &((y)->z), sizeof((y)->z)))
  70static inline int PAR_EQUAL(struct fb_par_control *x, struct fb_par_control *y)
  71{
  72        int i, results;
  73
  74        results = 1;
  75        for (i = 0; i < 3; i++)
  76                results &= !DIRTY(regvals.clock_params[i]);
  77        if (!results)
  78                return 0;
  79        for (i = 0; i < 16; i++)
  80                results &= !DIRTY(regvals.regs[i]);
  81        if (!results)
  82                return 0;
  83        return (!DIRTY(cmode) && !DIRTY(xres) && !DIRTY(yres)
  84                && !DIRTY(vxres) && !DIRTY(vyres));
  85}
  86static inline int VAR_MATCH(struct fb_var_screeninfo *x, struct fb_var_screeninfo *y)
  87{
  88        return (!DIRTY(bits_per_pixel) && !DIRTY(xres)
  89                && !DIRTY(yres) && !DIRTY(xres_virtual)
  90                && !DIRTY(yres_virtual)
  91                && !DIRTY_CMAP(red) && !DIRTY_CMAP(green) && !DIRTY_CMAP(blue));
  92}
  93
  94struct fb_info_control {
  95        struct fb_info          info;
  96        struct fb_par_control   par;
  97        u32                     pseudo_palette[16];
  98                
  99        struct cmap_regs        __iomem *cmap_regs;
 100        unsigned long           cmap_regs_phys;
 101        
 102        struct control_regs     __iomem *control_regs;
 103        unsigned long           control_regs_phys;
 104        unsigned long           control_regs_size;
 105        
 106        __u8                    __iomem *frame_buffer;
 107        unsigned long           frame_buffer_phys;
 108        unsigned long           fb_orig_base;
 109        unsigned long           fb_orig_size;
 110
 111        int                     control_use_bank2;
 112        unsigned long           total_vram;
 113        unsigned char           vram_attr;
 114};
 115
 116/* control register access macro */
 117#define CNTRL_REG(INFO,REG) (&(((INFO)->control_regs->REG).r))
 118
 119
 120/******************** Prototypes for exported functions ********************/
 121/*
 122 * struct fb_ops
 123 */
 124static int controlfb_pan_display(struct fb_var_screeninfo *var,
 125        struct fb_info *info);
 126static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 127        u_int transp, struct fb_info *info);
 128static int controlfb_blank(int blank_mode, struct fb_info *info);
 129static int controlfb_mmap(struct fb_info *info,
 130        struct vm_area_struct *vma);
 131static int controlfb_set_par (struct fb_info *info);
 132static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info);
 133
 134/******************** Prototypes for internal functions **********************/
 135
 136static void set_control_clock(unsigned char *params);
 137static int init_control(struct fb_info_control *p);
 138static void control_set_hardware(struct fb_info_control *p,
 139        struct fb_par_control *par);
 140static int control_of_init(struct device_node *dp);
 141static void find_vram_size(struct fb_info_control *p);
 142static int read_control_sense(struct fb_info_control *p);
 143static int calc_clock_params(unsigned long clk, unsigned char *param);
 144static int control_var_to_par(struct fb_var_screeninfo *var,
 145        struct fb_par_control *par, const struct fb_info *fb_info);
 146static inline void control_par_to_var(struct fb_par_control *par,
 147        struct fb_var_screeninfo *var);
 148static void control_init_info(struct fb_info *info, struct fb_info_control *p);
 149static void control_cleanup(void);
 150
 151
 152/************************** Internal variables *******************************/
 153
 154static struct fb_info_control *control_fb;
 155
 156static int default_vmode __initdata = VMODE_NVRAM;
 157static int default_cmode __initdata = CMODE_NVRAM;
 158
 159
 160static struct fb_ops controlfb_ops = {
 161        .owner          = THIS_MODULE,
 162        .fb_check_var   = controlfb_check_var,
 163        .fb_set_par     = controlfb_set_par,
 164        .fb_setcolreg   = controlfb_setcolreg,
 165        .fb_pan_display = controlfb_pan_display,
 166        .fb_blank       = controlfb_blank,
 167        .fb_mmap        = controlfb_mmap,
 168        .fb_fillrect    = cfb_fillrect,
 169        .fb_copyarea    = cfb_copyarea,
 170        .fb_imageblit   = cfb_imageblit,
 171};
 172
 173
 174/********************  The functions for controlfb_ops ********************/
 175
 176#ifdef MODULE
 177MODULE_LICENSE("GPL");
 178
 179int init_module(void)
 180{
 181        struct device_node *dp;
 182        int ret = -ENXIO;
 183
 184        dp = of_find_node_by_name(NULL, "control");
 185        if (dp != 0 && !control_of_init(dp))
 186                ret = 0;
 187        of_node_put(dp);
 188
 189        return ret;
 190}
 191
 192void cleanup_module(void)
 193{
 194        control_cleanup();
 195}
 196#endif
 197
 198/*
 199 * Checks a var structure
 200 */
 201static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info)
 202{
 203        struct fb_par_control par;
 204        int err;
 205
 206        err = control_var_to_par(var, &par, info);
 207        if (err)
 208                return err;     
 209        control_par_to_var(&par, var);
 210
 211        return 0;
 212}
 213
 214/*
 215 * Applies current var to display
 216 */
 217static int controlfb_set_par (struct fb_info *info)
 218{
 219        struct fb_info_control *p = (struct fb_info_control *) info;
 220        struct fb_par_control par;
 221        int err;
 222
 223        if((err = control_var_to_par(&info->var, &par, info))) {
 224                printk (KERN_ERR "controlfb_set_par: error calling"
 225                                 " control_var_to_par: %d.\n", err);
 226                return err;
 227        }
 228        
 229        control_set_hardware(p, &par);
 230
 231        info->fix.visual = (p->par.cmode == CMODE_8) ?
 232                FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
 233        info->fix.line_length = p->par.pitch;
 234        info->fix.xpanstep = 32 >> p->par.cmode;
 235        info->fix.ypanstep = 1;
 236
 237        return 0;
 238}
 239
 240/*
 241 * Set screen start address according to var offset values
 242 */
 243static inline void set_screen_start(int xoffset, int yoffset,
 244        struct fb_info_control *p)
 245{
 246        struct fb_par_control *par = &p->par;
 247
 248        par->xoffset = xoffset;
 249        par->yoffset = yoffset;
 250        out_le32(CNTRL_REG(p,start_addr),
 251                 par->yoffset * par->pitch + (par->xoffset << par->cmode));
 252}
 253
 254
 255static int controlfb_pan_display(struct fb_var_screeninfo *var,
 256                                 struct fb_info *info)
 257{
 258        unsigned int xoffset, hstep;
 259        struct fb_info_control *p = (struct fb_info_control *)info;
 260        struct fb_par_control *par = &p->par;
 261
 262        /*
 263         * make sure start addr will be 32-byte aligned
 264         */
 265        hstep = 0x1f >> par->cmode;
 266        xoffset = (var->xoffset + hstep) & ~hstep;
 267
 268        if (xoffset+par->xres > par->vxres ||
 269            var->yoffset+par->yres > par->vyres)
 270                return -EINVAL;
 271
 272        set_screen_start(xoffset, var->yoffset, p);
 273
 274        return 0;
 275}
 276
 277
 278/*
 279 * Private mmap since we want to have a different caching on the framebuffer
 280 * for controlfb.
 281 * Note there's no locking in here; it's done in fb_mmap() in fbmem.c.
 282 */
 283static int controlfb_mmap(struct fb_info *info,
 284                       struct vm_area_struct *vma)
 285{
 286       unsigned long off, start;
 287       u32 len;
 288
 289       off = vma->vm_pgoff << PAGE_SHIFT;
 290
 291       /* frame buffer memory */
 292       start = info->fix.smem_start;
 293       len = PAGE_ALIGN((start & ~PAGE_MASK)+info->fix.smem_len);
 294       if (off >= len) {
 295               /* memory mapped io */
 296               off -= len;
 297               if (info->var.accel_flags)
 298                       return -EINVAL;
 299               start = info->fix.mmio_start;
 300               len = PAGE_ALIGN((start & ~PAGE_MASK)+info->fix.mmio_len);
 301               pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE|_PAGE_GUARDED;
 302       } else {
 303               /* framebuffer */
 304               pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU;
 305       }
 306       start &= PAGE_MASK;
 307       if ((vma->vm_end - vma->vm_start + off) > len)
 308                return -EINVAL;
 309       off += start;
 310       vma->vm_pgoff = off >> PAGE_SHIFT;
 311       if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
 312           vma->vm_end - vma->vm_start, vma->vm_page_prot))
 313               return -EAGAIN;
 314
 315       return 0;
 316}
 317
 318static int controlfb_blank(int blank_mode, struct fb_info *info)
 319{
 320        struct fb_info_control *p = (struct fb_info_control *) info;
 321        unsigned ctrl;
 322
 323        ctrl = ld_le32(CNTRL_REG(p,ctrl));
 324        if (blank_mode > 0)
 325                switch (blank_mode) {
 326                case FB_BLANK_VSYNC_SUSPEND:
 327                        ctrl &= ~3;
 328                        break;
 329                case FB_BLANK_HSYNC_SUSPEND:
 330                        ctrl &= ~0x30;
 331                        break;
 332                case FB_BLANK_POWERDOWN:
 333                        ctrl &= ~0x33;
 334                        /* fall through */
 335                case FB_BLANK_NORMAL:
 336                        ctrl |= 0x400;
 337                        break;
 338                default:
 339                        break;
 340                }
 341        else {
 342                ctrl &= ~0x400;
 343                ctrl |= 0x33;
 344        }
 345        out_le32(CNTRL_REG(p,ctrl), ctrl);
 346
 347        return 0;
 348}
 349
 350static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 351                             u_int transp, struct fb_info *info)
 352{
 353        struct fb_info_control *p = (struct fb_info_control *) info;
 354        __u8 r, g, b;
 355
 356        if (regno > 255)
 357                return 1;
 358
 359        r = red >> 8;
 360        g = green >> 8;
 361        b = blue >> 8;
 362
 363        out_8(&p->cmap_regs->addr, regno);      /* tell clut what addr to fill  */
 364        out_8(&p->cmap_regs->lut, r);           /* send one color channel at    */
 365        out_8(&p->cmap_regs->lut, g);           /* a time...                    */
 366        out_8(&p->cmap_regs->lut, b);
 367
 368        if (regno < 16) {
 369                int i;
 370                switch (p->par.cmode) {
 371                case CMODE_16:
 372                        p->pseudo_palette[regno] =
 373                            (regno << 10) | (regno << 5) | regno;
 374                        break;
 375                case CMODE_32:
 376                        i = (regno << 8) | regno;
 377                        p->pseudo_palette[regno] = (i << 16) | i;
 378                        break;
 379                }
 380        }
 381
 382        return 0;
 383}
 384
 385
 386/********************  End of controlfb_ops implementation  ******************/
 387
 388
 389
 390static void set_control_clock(unsigned char *params)
 391{
 392#ifdef CONFIG_ADB_CUDA
 393        struct adb_request req;
 394        int i;
 395
 396        for (i = 0; i < 3; ++i) {
 397                cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
 398                             0x50, i + 1, params[i]);
 399                while (!req.complete)
 400                        cuda_poll();
 401        }
 402#endif  
 403}
 404
 405
 406/*
 407 * finish off the driver initialization and register
 408 */
 409static int __init init_control(struct fb_info_control *p)
 410{
 411        int full, sense, vmode, cmode, vyres;
 412        struct fb_var_screeninfo var;
 413        int rc;
 414        
 415        printk(KERN_INFO "controlfb: ");
 416
 417        full = p->total_vram == 0x400000;
 418
 419        /* Try to pick a video mode out of NVRAM if we have one. */
 420#ifdef CONFIG_NVRAM
 421        if (default_cmode == CMODE_NVRAM){
 422                cmode = nvram_read_byte(NV_CMODE);
 423                if(cmode < CMODE_8 || cmode > CMODE_32)
 424                        cmode = CMODE_8;
 425        } else
 426#endif
 427                cmode=default_cmode;
 428#ifdef CONFIG_NVRAM
 429        if (default_vmode == VMODE_NVRAM) {
 430                vmode = nvram_read_byte(NV_VMODE);
 431                if (vmode < 1 || vmode > VMODE_MAX ||
 432                    control_mac_modes[vmode - 1].m[full] < cmode) {
 433                        sense = read_control_sense(p);
 434                        printk("Monitor sense value = 0x%x, ", sense);
 435                        vmode = mac_map_monitor_sense(sense);
 436                        if (control_mac_modes[vmode - 1].m[full] < cmode)
 437                                vmode = VMODE_640_480_60;
 438                }
 439        } else
 440#endif
 441        {
 442                vmode=default_vmode;
 443                if (control_mac_modes[vmode - 1].m[full] < cmode) {
 444                        if (cmode > CMODE_8)
 445                                cmode--;
 446                        else
 447                                vmode = VMODE_640_480_60;
 448                }
 449        }
 450
 451        /* Initialize info structure */
 452        control_init_info(&p->info, p);
 453
 454        /* Setup default var */
 455        if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
 456                /* This shouldn't happen! */
 457                printk("mac_vmode_to_var(%d, %d,) failed\n", vmode, cmode);
 458try_again:
 459                vmode = VMODE_640_480_60;
 460                cmode = CMODE_8;
 461                if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
 462                        printk(KERN_ERR "controlfb: mac_vmode_to_var() failed\n");
 463                        return -ENXIO;
 464                }
 465                printk(KERN_INFO "controlfb: ");
 466        }
 467        printk("using video mode %d and color mode %d.\n", vmode, cmode);
 468
 469        vyres = (p->total_vram - CTRLFB_OFF) / (var.xres << cmode);
 470        if (vyres > var.yres)
 471                var.yres_virtual = vyres;
 472
 473        /* Apply default var */
 474        var.activate = FB_ACTIVATE_NOW;
 475        rc = fb_set_var(&p->info, &var);
 476        if (rc && (vmode != VMODE_640_480_60 || cmode != CMODE_8))
 477                goto try_again;
 478
 479        /* Register with fbdev layer */
 480        if (register_framebuffer(&p->info) < 0)
 481                return -ENXIO;
 482        
 483        printk(KERN_INFO "fb%d: control display adapter\n", p->info.node);      
 484
 485        return 0;
 486}
 487
 488#define RADACAL_WRITE(a,d) \
 489        out_8(&p->cmap_regs->addr, (a)); \
 490        out_8(&p->cmap_regs->dat,   (d))
 491
 492/* Now how about actually saying, Make it so! */
 493/* Some things in here probably don't need to be done each time. */
 494static void control_set_hardware(struct fb_info_control *p, struct fb_par_control *par)
 495{
 496        struct control_regvals  *r;
 497        volatile struct preg    __iomem *rp;
 498        int                     i, cmode;
 499
 500        if (PAR_EQUAL(&p->par, par)) {
 501                /*
 502                 * check if only xoffset or yoffset differs.
 503                 * this prevents flickers in typical VT switch case.
 504                 */
 505                if (p->par.xoffset != par->xoffset ||
 506                    p->par.yoffset != par->yoffset)
 507                        set_screen_start(par->xoffset, par->yoffset, p);
 508                        
 509                return;
 510        }
 511        
 512        p->par = *par;
 513        cmode = p->par.cmode;
 514        r = &par->regvals;
 515        
 516        /* Turn off display */
 517        out_le32(CNTRL_REG(p,ctrl), 0x400 | par->ctrl);
 518        
 519        set_control_clock(r->clock_params);
 520        
 521        RADACAL_WRITE(0x20, r->radacal_ctrl);
 522        RADACAL_WRITE(0x21, p->control_use_bank2 ? 0 : 1);
 523        RADACAL_WRITE(0x10, 0);
 524        RADACAL_WRITE(0x11, 0);
 525
 526        rp = &p->control_regs->vswin;
 527        for (i = 0; i < 16; ++i, ++rp)
 528                out_le32(&rp->r, r->regs[i]);
 529        
 530        out_le32(CNTRL_REG(p,pitch), par->pitch);
 531        out_le32(CNTRL_REG(p,mode), r->mode);
 532        out_le32(CNTRL_REG(p,vram_attr), p->vram_attr);
 533        out_le32(CNTRL_REG(p,start_addr), par->yoffset * par->pitch
 534                 + (par->xoffset << cmode));
 535        out_le32(CNTRL_REG(p,rfrcnt), 0x1e5);
 536        out_le32(CNTRL_REG(p,intr_ena), 0);
 537
 538        /* Turn on display */
 539        out_le32(CNTRL_REG(p,ctrl), par->ctrl);
 540
 541#ifdef CONFIG_BOOTX_TEXT
 542        btext_update_display(p->frame_buffer_phys + CTRLFB_OFF,
 543                             p->par.xres, p->par.yres,
 544                             (cmode == CMODE_32? 32: cmode == CMODE_16? 16: 8),
 545                             p->par.pitch);
 546#endif /* CONFIG_BOOTX_TEXT */
 547}
 548
 549
 550/*
 551 * Parse user speficied options (`video=controlfb:')
 552 */
 553static void __init control_setup(char *options)
 554{
 555        char *this_opt;
 556
 557        if (!options || !*options)
 558                return;
 559
 560        while ((this_opt = strsep(&options, ",")) != NULL) {
 561                if (!strncmp(this_opt, "vmode:", 6)) {
 562                        int vmode = simple_strtoul(this_opt+6, NULL, 0);
 563                        if (vmode > 0 && vmode <= VMODE_MAX &&
 564                            control_mac_modes[vmode - 1].m[1] >= 0)
 565                                default_vmode = vmode;
 566                } else if (!strncmp(this_opt, "cmode:", 6)) {
 567                        int depth = simple_strtoul(this_opt+6, NULL, 0);
 568                        switch (depth) {
 569                         case CMODE_8:
 570                         case CMODE_16:
 571                         case CMODE_32:
 572                                default_cmode = depth;
 573                                break;
 574                         case 8:
 575                                default_cmode = CMODE_8;
 576                                break;
 577                         case 15:
 578                         case 16:
 579                                default_cmode = CMODE_16;
 580                                break;
 581                         case 24:
 582                         case 32:
 583                                default_cmode = CMODE_32;
 584                                break;
 585                        }
 586                }
 587        }
 588}
 589
 590static int __init control_init(void)
 591{
 592        struct device_node *dp;
 593        char *option = NULL;
 594        int ret = -ENXIO;
 595
 596        if (fb_get_options("controlfb", &option))
 597                return -ENODEV;
 598        control_setup(option);
 599
 600        dp = of_find_node_by_name(NULL, "control");
 601        if (dp != 0 && !control_of_init(dp))
 602                ret = 0;
 603        of_node_put(dp);
 604
 605        return ret;
 606}
 607
 608module_init(control_init);
 609
 610/* Work out which banks of VRAM we have installed. */
 611/* danj: I guess the card just ignores writes to nonexistant VRAM... */
 612
 613static void __init find_vram_size(struct fb_info_control *p)
 614{
 615        int bank1, bank2;
 616
 617        /*
 618         * Set VRAM in 2MB (bank 1) mode
 619         * VRAM Bank 2 will be accessible through offset 0x600000 if present
 620         * and VRAM Bank 1 will not respond at that offset even if present
 621         */
 622        out_le32(CNTRL_REG(p,vram_attr), 0x31);
 623
 624        out_8(&p->frame_buffer[0x600000], 0xb3);
 625        out_8(&p->frame_buffer[0x600001], 0x71);
 626        asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0x600000])
 627                                        : "memory" );
 628        mb();
 629        asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0x600000])
 630                                        : "memory" );
 631        mb();
 632
 633        bank2 = (in_8(&p->frame_buffer[0x600000]) == 0xb3)
 634                && (in_8(&p->frame_buffer[0x600001]) == 0x71);
 635
 636        /*
 637         * Set VRAM in 2MB (bank 2) mode
 638         * VRAM Bank 1 will be accessible through offset 0x000000 if present
 639         * and VRAM Bank 2 will not respond at that offset even if present
 640         */
 641        out_le32(CNTRL_REG(p,vram_attr), 0x39);
 642
 643        out_8(&p->frame_buffer[0], 0x5a);
 644        out_8(&p->frame_buffer[1], 0xc7);
 645        asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0])
 646                                        : "memory" );
 647        mb();
 648        asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0])
 649                                        : "memory" );
 650        mb();
 651
 652        bank1 = (in_8(&p->frame_buffer[0]) == 0x5a)
 653                && (in_8(&p->frame_buffer[1]) == 0xc7);
 654
 655        if (bank2) {
 656                if (!bank1) {
 657                        /*
 658                         * vram bank 2 only
 659                         */
 660                        p->control_use_bank2 = 1;
 661                        p->vram_attr = 0x39;
 662                        p->frame_buffer += 0x600000;
 663                        p->frame_buffer_phys += 0x600000;
 664                } else {
 665                        /*
 666                         * 4 MB vram
 667                         */
 668                        p->vram_attr = 0x51;
 669                }
 670        } else {
 671                /*
 672                 * vram bank 1 only
 673                 */
 674                p->vram_attr = 0x31;
 675        }
 676
 677        p->total_vram = (bank1 + bank2) * 0x200000;
 678
 679        printk(KERN_INFO "controlfb: VRAM Total = %dMB "
 680                        "(%dMB @ bank 1, %dMB @ bank 2)\n",
 681                        (bank1 + bank2) << 1, bank1 << 1, bank2 << 1);
 682}
 683
 684
 685/*
 686 * find "control" and initialize
 687 */
 688static int __init control_of_init(struct device_node *dp)
 689{
 690        struct fb_info_control  *p;
 691        struct resource         fb_res, reg_res;
 692
 693        if (control_fb) {
 694                printk(KERN_ERR "controlfb: only one control is supported\n");
 695                return -ENXIO;
 696        }
 697
 698        if (of_pci_address_to_resource(dp, 2, &fb_res) ||
 699            of_pci_address_to_resource(dp, 1, &reg_res)) {
 700                printk(KERN_ERR "can't get 2 addresses for control\n");
 701                return -ENXIO;
 702        }
 703        p = kzalloc(sizeof(*p), GFP_KERNEL);
 704        if (p == 0)
 705                return -ENXIO;
 706        control_fb = p; /* save it for cleanups */
 707
 708        /* Map in frame buffer and registers */
 709        p->fb_orig_base = fb_res.start;
 710        p->fb_orig_size = fb_res.end - fb_res.start + 1;
 711        /* use the big-endian aperture (??) */
 712        p->frame_buffer_phys = fb_res.start + 0x800000;
 713        p->control_regs_phys = reg_res.start;
 714        p->control_regs_size = reg_res.end - reg_res.start + 1;
 715
 716        if (!p->fb_orig_base ||
 717            !request_mem_region(p->fb_orig_base,p->fb_orig_size,"controlfb")) {
 718                p->fb_orig_base = 0;
 719                goto error_out;
 720        }
 721        /* map at most 8MB for the frame buffer */
 722        p->frame_buffer = __ioremap(p->frame_buffer_phys, 0x800000,
 723                                    _PAGE_WRITETHRU);
 724
 725        if (!p->control_regs_phys ||
 726            !request_mem_region(p->control_regs_phys, p->control_regs_size,
 727            "controlfb regs")) {
 728                p->control_regs_phys = 0;
 729                goto error_out;
 730        }
 731        p->control_regs = ioremap(p->control_regs_phys, p->control_regs_size);
 732
 733        p->cmap_regs_phys = 0xf301b000;  /* XXX not in prom? */
 734        if (!request_mem_region(p->cmap_regs_phys, 0x1000, "controlfb cmap")) {
 735                p->cmap_regs_phys = 0;
 736                goto error_out;
 737        }
 738        p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
 739
 740        if (!p->cmap_regs || !p->control_regs || !p->frame_buffer)
 741                goto error_out;
 742
 743        find_vram_size(p);
 744        if (!p->total_vram)
 745                goto error_out;
 746
 747        if (init_control(p) < 0)
 748                goto error_out;
 749
 750        return 0;
 751
 752error_out:
 753        control_cleanup();
 754        return -ENXIO;
 755}
 756
 757/*
 758 * Get the monitor sense value.
 759 * Note that this can be called before calibrate_delay,
 760 * so we can't use udelay.
 761 */
 762static int read_control_sense(struct fb_info_control *p)
 763{
 764        int sense;
 765
 766        out_le32(CNTRL_REG(p,mon_sense), 7);    /* drive all lines high */
 767        __delay(200);
 768        out_le32(CNTRL_REG(p,mon_sense), 077);  /* turn off drivers */
 769        __delay(2000);
 770        sense = (in_le32(CNTRL_REG(p,mon_sense)) & 0x1c0) << 2;
 771
 772        /* drive each sense line low in turn and collect the other 2 */
 773        out_le32(CNTRL_REG(p,mon_sense), 033);  /* drive A low */
 774        __delay(2000);
 775        sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0xc0) >> 2;
 776        out_le32(CNTRL_REG(p,mon_sense), 055);  /* drive B low */
 777        __delay(2000);
 778        sense |= ((in_le32(CNTRL_REG(p,mon_sense)) & 0x100) >> 5)
 779                | ((in_le32(CNTRL_REG(p,mon_sense)) & 0x40) >> 4);
 780        out_le32(CNTRL_REG(p,mon_sense), 066);  /* drive C low */
 781        __delay(2000);
 782        sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0x180) >> 7;
 783
 784        out_le32(CNTRL_REG(p,mon_sense), 077);  /* turn off drivers */
 785        
 786        return sense;
 787}
 788
 789/**********************  Various translation functions  **********************/
 790
 791#define CONTROL_PIXCLOCK_BASE   256016
 792#define CONTROL_PIXCLOCK_MIN    5000    /* ~ 200 MHz dot clock */
 793
 794/*
 795 * calculate the clock paramaters to be sent to CUDA according to given
 796 * pixclock in pico second.
 797 */
 798static int calc_clock_params(unsigned long clk, unsigned char *param)
 799{
 800        unsigned long p0, p1, p2, k, l, m, n, min;
 801
 802        if (clk > (CONTROL_PIXCLOCK_BASE << 3))
 803                return 1;
 804
 805        p2 = ((clk << 4) < CONTROL_PIXCLOCK_BASE)? 3: 2;
 806        l = clk << p2;
 807        p0 = 0;
 808        p1 = 0;
 809        for (k = 1, min = l; k < 32; k++) {
 810                unsigned long rem;
 811
 812                m = CONTROL_PIXCLOCK_BASE * k;
 813                n = m / l;
 814                rem = m % l;
 815                if (n && (n < 128) && rem < min) {
 816                        p0 = k;
 817                        p1 = n;
 818                        min = rem;
 819                }
 820        }
 821        if (!p0 || !p1)
 822                return 1;
 823
 824        param[0] = p0;
 825        param[1] = p1;
 826        param[2] = p2;
 827
 828        return 0;
 829}
 830
 831
 832/*
 833 * This routine takes a user-supplied var, and picks the best vmode/cmode
 834 * from it.
 835 */
 836
 837static int control_var_to_par(struct fb_var_screeninfo *var,
 838        struct fb_par_control *par, const struct fb_info *fb_info)
 839{
 840        int cmode, piped_diff, hstep;
 841        unsigned hperiod, hssync, hsblank, hesync, heblank, piped, heq, hlfln,
 842                 hserr, vperiod, vssync, vesync, veblank, vsblank, vswin, vewin;
 843        unsigned long pixclock;
 844        struct fb_info_control *p = (struct fb_info_control *) fb_info;
 845        struct control_regvals *r = &par->regvals;
 846
 847        switch (var->bits_per_pixel) {
 848        case 8:
 849                par->cmode = CMODE_8;
 850                if (p->total_vram > 0x200000) {
 851                        r->mode = 3;
 852                        r->radacal_ctrl = 0x20;
 853                        piped_diff = 13;
 854                } else {
 855                        r->mode = 2;
 856                        r->radacal_ctrl = 0x10;
 857                        piped_diff = 9;
 858                }
 859                break;
 860        case 15:
 861        case 16:
 862                par->cmode = CMODE_16;
 863                if (p->total_vram > 0x200000) {
 864                        r->mode = 2;
 865                        r->radacal_ctrl = 0x24;
 866                        piped_diff = 5;
 867                } else {
 868                        r->mode = 1;
 869                        r->radacal_ctrl = 0x14;
 870                        piped_diff = 3;
 871                }
 872                break;
 873        case 32:
 874                par->cmode = CMODE_32;
 875                if (p->total_vram > 0x200000) {
 876                        r->mode = 1;
 877                        r->radacal_ctrl = 0x28;
 878                } else {
 879                        r->mode = 0;
 880                        r->radacal_ctrl = 0x18;
 881                }
 882                piped_diff = 1;
 883                break;
 884        default:
 885                return -EINVAL;
 886        }
 887
 888        /*
 889         * adjust xres and vxres so that the corresponding memory widths are
 890         * 32-byte aligned
 891         */
 892        hstep = 31 >> par->cmode;
 893        par->xres = (var->xres + hstep) & ~hstep;
 894        par->vxres = (var->xres_virtual + hstep) & ~hstep;
 895        par->xoffset = (var->xoffset + hstep) & ~hstep;
 896        if (par->vxres < par->xres)
 897                par->vxres = par->xres;
 898        par->pitch = par->vxres << par->cmode;
 899
 900        par->yres = var->yres;
 901        par->vyres = var->yres_virtual;
 902        par->yoffset = var->yoffset;
 903        if (par->vyres < par->yres)
 904                par->vyres = par->yres;
 905
 906        par->sync = var->sync;
 907
 908        if (par->pitch * par->vyres + CTRLFB_OFF > p->total_vram)
 909                return -EINVAL;
 910
 911        if (par->xoffset + par->xres > par->vxres)
 912                par->xoffset = par->vxres - par->xres;
 913        if (par->yoffset + par->yres > par->vyres)
 914                par->yoffset = par->vyres - par->yres;
 915
 916        pixclock = (var->pixclock < CONTROL_PIXCLOCK_MIN)? CONTROL_PIXCLOCK_MIN:
 917                   var->pixclock;
 918        if (calc_clock_params(pixclock, r->clock_params))
 919                return -EINVAL;
 920
 921        hperiod = ((var->left_margin + par->xres + var->right_margin
 922                    + var->hsync_len) >> 1) - 2;
 923        hssync = hperiod + 1;
 924        hsblank = hssync - (var->right_margin >> 1);
 925        hesync = (var->hsync_len >> 1) - 1;
 926        heblank = (var->left_margin >> 1) + hesync;
 927        piped = heblank - piped_diff;
 928        heq = var->hsync_len >> 2;
 929        hlfln = (hperiod+2) >> 1;
 930        hserr = hssync-hesync;
 931        vperiod = (var->vsync_len + var->lower_margin + par->yres
 932                   + var->upper_margin) << 1;
 933        vssync = vperiod - 2;
 934        vesync = (var->vsync_len << 1) - vperiod + vssync;
 935        veblank = (var->upper_margin << 1) + vesync;
 936        vsblank = vssync - (var->lower_margin << 1);
 937        vswin = (vsblank+vssync) >> 1;
 938        vewin = (vesync+veblank) >> 1;
 939
 940        r->regs[0] = vswin;
 941        r->regs[1] = vsblank;
 942        r->regs[2] = veblank;
 943        r->regs[3] = vewin;
 944        r->regs[4] = vesync;
 945        r->regs[5] = vssync;
 946        r->regs[6] = vperiod;
 947        r->regs[7] = piped;
 948        r->regs[8] = hperiod;
 949        r->regs[9] = hsblank;
 950        r->regs[10] = heblank;
 951        r->regs[11] = hesync;
 952        r->regs[12] = hssync;
 953        r->regs[13] = heq;
 954        r->regs[14] = hlfln;
 955        r->regs[15] = hserr;
 956
 957        if (par->xres >= 1280 && par->cmode >= CMODE_16)
 958                par->ctrl = 0x7f;
 959        else
 960                par->ctrl = 0x3b;
 961
 962        if (mac_var_to_vmode(var, &par->vmode, &cmode))
 963                par->vmode = 0;
 964
 965        return 0;
 966}
 967
 968
 969/*
 970 * Convert hardware data in par to an fb_var_screeninfo
 971 */
 972
 973static void control_par_to_var(struct fb_par_control *par, struct fb_var_screeninfo *var)
 974{
 975        struct control_regints *rv;
 976        
 977        rv = (struct control_regints *) par->regvals.regs;
 978        
 979        memset(var, 0, sizeof(*var));
 980        var->xres = par->xres;
 981        var->yres = par->yres;
 982        var->xres_virtual = par->vxres;
 983        var->yres_virtual = par->vyres;
 984        var->xoffset = par->xoffset;
 985        var->yoffset = par->yoffset;
 986        
 987        switch(par->cmode) {
 988        default:
 989        case CMODE_8:
 990                var->bits_per_pixel = 8;
 991                var->red.length = 8;
 992                var->green.length = 8;
 993                var->blue.length = 8;
 994                break;
 995        case CMODE_16:  /* RGB 555 */
 996                var->bits_per_pixel = 16;
 997                var->red.offset = 10;
 998                var->red.length = 5;
 999                var->green.offset = 5;
1000                var->green.length = 5;
1001                var->blue.length = 5;
1002                break;
1003        case CMODE_32:  /* RGB 888 */
1004                var->bits_per_pixel = 32;
1005                var->red.offset = 16;
1006                var->red.length = 8;
1007                var->green.offset = 8;
1008                var->green.length = 8;
1009                var->blue.length = 8;
1010                var->transp.offset = 24;
1011                var->transp.length = 8;
1012                break;
1013        }
1014        var->height = -1;
1015        var->width = -1;
1016        var->vmode = FB_VMODE_NONINTERLACED;
1017
1018        var->left_margin = (rv->heblank - rv->hesync) << 1;
1019        var->right_margin = (rv->hssync - rv->hsblank) << 1;
1020        var->hsync_len = (rv->hperiod + 2 - rv->hssync + rv->hesync) << 1;
1021
1022        var->upper_margin = (rv->veblank - rv->vesync) >> 1;
1023        var->lower_margin = (rv->vssync - rv->vsblank) >> 1;
1024        var->vsync_len = (rv->vperiod - rv->vssync + rv->vesync) >> 1;
1025
1026        var->sync = par->sync;
1027
1028        /*
1029         * 10^12 * clock_params[0] / (3906400 * clock_params[1]
1030         *                            * 2^clock_params[2])
1031         * (10^12 * clock_params[0] / (3906400 * clock_params[1]))
1032         * >> clock_params[2]
1033         */
1034        /* (255990.17 * clock_params[0] / clock_params[1]) >> clock_params[2] */
1035        var->pixclock = CONTROL_PIXCLOCK_BASE * par->regvals.clock_params[0];
1036        var->pixclock /= par->regvals.clock_params[1];
1037        var->pixclock >>= par->regvals.clock_params[2];
1038}
1039
1040/*
1041 * Set misc info vars for this driver
1042 */
1043static void __init control_init_info(struct fb_info *info, struct fb_info_control *p)
1044{
1045        /* Fill fb_info */
1046        info->par = &p->par;
1047        info->fbops = &controlfb_ops;
1048        info->pseudo_palette = p->pseudo_palette;
1049        info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
1050        info->screen_base = p->frame_buffer + CTRLFB_OFF;
1051
1052        fb_alloc_cmap(&info->cmap, 256, 0);
1053
1054        /* Fill fix common fields */
1055        strcpy(info->fix.id, "control");
1056        info->fix.mmio_start = p->control_regs_phys;
1057        info->fix.mmio_len = sizeof(struct control_regs);
1058        info->fix.type = FB_TYPE_PACKED_PIXELS;
1059        info->fix.smem_start = p->frame_buffer_phys + CTRLFB_OFF;
1060        info->fix.smem_len = p->total_vram - CTRLFB_OFF;
1061        info->fix.ywrapstep = 0;
1062        info->fix.type_aux = 0;
1063        info->fix.accel = FB_ACCEL_NONE;
1064}
1065
1066
1067static void control_cleanup(void)
1068{
1069        struct fb_info_control  *p = control_fb;
1070
1071        if (!p)
1072                return;
1073
1074        if (p->cmap_regs)
1075                iounmap(p->cmap_regs);
1076        if (p->control_regs)
1077                iounmap(p->control_regs);
1078        if (p->frame_buffer) {
1079                if (p->control_use_bank2)
1080                        p->frame_buffer -= 0x600000;
1081                iounmap(p->frame_buffer);
1082        }
1083        if (p->cmap_regs_phys)
1084                release_mem_region(p->cmap_regs_phys, 0x1000);
1085        if (p->control_regs_phys)
1086                release_mem_region(p->control_regs_phys, p->control_regs_size);
1087        if (p->fb_orig_base)
1088                release_mem_region(p->fb_orig_base, p->fb_orig_size);
1089        kfree(p);
1090}
1091
1092
1093