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/of.h>
  44#include <linux/of_address.h>
  45#include <linux/fb.h>
  46#include <linux/init.h>
  47#include <linux/pci.h>
  48#include <linux/nvram.h>
  49#include <linux/adb.h>
  50#include <linux/cuda.h>
  51#include <asm/io.h>
  52#include <asm/prom.h>
  53#include <asm/pgtable.h>
  54#include <asm/btext.h>
  55
  56#include "macmodes.h"
  57#include "controlfb.h"
  58
  59struct fb_par_control {
  60        int     vmode, cmode;
  61        int     xres, yres;
  62        int     vxres, vyres;
  63        int     xoffset, yoffset;
  64        int     pitch;
  65        struct control_regvals  regvals;
  66        unsigned long sync;
  67        unsigned char ctrl;
  68};
  69
  70#define DIRTY(z) ((x)->z != (y)->z)
  71#define DIRTY_CMAP(z) (memcmp(&((x)->z), &((y)->z), sizeof((y)->z)))
  72static inline int PAR_EQUAL(struct fb_par_control *x, struct fb_par_control *y)
  73{
  74        int i, results;
  75
  76        results = 1;
  77        for (i = 0; i < 3; i++)
  78                results &= !DIRTY(regvals.clock_params[i]);
  79        if (!results)
  80                return 0;
  81        for (i = 0; i < 16; i++)
  82                results &= !DIRTY(regvals.regs[i]);
  83        if (!results)
  84                return 0;
  85        return (!DIRTY(cmode) && !DIRTY(xres) && !DIRTY(yres)
  86                && !DIRTY(vxres) && !DIRTY(vyres));
  87}
  88static inline int VAR_MATCH(struct fb_var_screeninfo *x, struct fb_var_screeninfo *y)
  89{
  90        return (!DIRTY(bits_per_pixel) && !DIRTY(xres)
  91                && !DIRTY(yres) && !DIRTY(xres_virtual)
  92                && !DIRTY(yres_virtual)
  93                && !DIRTY_CMAP(red) && !DIRTY_CMAP(green) && !DIRTY_CMAP(blue));
  94}
  95
  96struct fb_info_control {
  97        struct fb_info          info;
  98        struct fb_par_control   par;
  99        u32                     pseudo_palette[16];
 100                
 101        struct cmap_regs        __iomem *cmap_regs;
 102        unsigned long           cmap_regs_phys;
 103        
 104        struct control_regs     __iomem *control_regs;
 105        unsigned long           control_regs_phys;
 106        unsigned long           control_regs_size;
 107        
 108        __u8                    __iomem *frame_buffer;
 109        unsigned long           frame_buffer_phys;
 110        unsigned long           fb_orig_base;
 111        unsigned long           fb_orig_size;
 112
 113        int                     control_use_bank2;
 114        unsigned long           total_vram;
 115        unsigned char           vram_attr;
 116};
 117
 118/* control register access macro */
 119#define CNTRL_REG(INFO,REG) (&(((INFO)->control_regs->REG).r))
 120
 121
 122/******************** Prototypes for exported functions ********************/
 123/*
 124 * struct fb_ops
 125 */
 126static int controlfb_pan_display(struct fb_var_screeninfo *var,
 127        struct fb_info *info);
 128static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 129        u_int transp, struct fb_info *info);
 130static int controlfb_blank(int blank_mode, struct fb_info *info);
 131static int controlfb_mmap(struct fb_info *info,
 132        struct vm_area_struct *vma);
 133static int controlfb_set_par (struct fb_info *info);
 134static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info);
 135
 136/******************** Prototypes for internal functions **********************/
 137
 138static void set_control_clock(unsigned char *params);
 139static int init_control(struct fb_info_control *p);
 140static void control_set_hardware(struct fb_info_control *p,
 141        struct fb_par_control *par);
 142static int control_of_init(struct device_node *dp);
 143static void find_vram_size(struct fb_info_control *p);
 144static int read_control_sense(struct fb_info_control *p);
 145static int calc_clock_params(unsigned long clk, unsigned char *param);
 146static int control_var_to_par(struct fb_var_screeninfo *var,
 147        struct fb_par_control *par, const struct fb_info *fb_info);
 148static inline void control_par_to_var(struct fb_par_control *par,
 149        struct fb_var_screeninfo *var);
 150static void control_init_info(struct fb_info *info, struct fb_info_control *p);
 151static void control_cleanup(void);
 152
 153
 154/************************** Internal variables *******************************/
 155
 156static struct fb_info_control *control_fb;
 157
 158static int default_vmode __initdata = VMODE_NVRAM;
 159static int default_cmode __initdata = CMODE_NVRAM;
 160
 161
 162static struct fb_ops controlfb_ops = {
 163        .owner          = THIS_MODULE,
 164        .fb_check_var   = controlfb_check_var,
 165        .fb_set_par     = controlfb_set_par,
 166        .fb_setcolreg   = controlfb_setcolreg,
 167        .fb_pan_display = controlfb_pan_display,
 168        .fb_blank       = controlfb_blank,
 169        .fb_mmap        = controlfb_mmap,
 170        .fb_fillrect    = cfb_fillrect,
 171        .fb_copyarea    = cfb_copyarea,
 172        .fb_imageblit   = cfb_imageblit,
 173};
 174
 175
 176/********************  The functions for controlfb_ops ********************/
 177
 178#ifdef MODULE
 179MODULE_LICENSE("GPL");
 180
 181int init_module(void)
 182{
 183        struct device_node *dp;
 184        int ret = -ENXIO;
 185
 186        dp = of_find_node_by_name(NULL, "control");
 187        if (dp != 0 && !control_of_init(dp))
 188                ret = 0;
 189        of_node_put(dp);
 190
 191        return ret;
 192}
 193
 194void cleanup_module(void)
 195{
 196        control_cleanup();
 197}
 198#endif
 199
 200/*
 201 * Checks a var structure
 202 */
 203static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info)
 204{
 205        struct fb_par_control par;
 206        int err;
 207
 208        err = control_var_to_par(var, &par, info);
 209        if (err)
 210                return err;     
 211        control_par_to_var(&par, var);
 212
 213        return 0;
 214}
 215
 216/*
 217 * Applies current var to display
 218 */
 219static int controlfb_set_par (struct fb_info *info)
 220{
 221        struct fb_info_control *p = (struct fb_info_control *) info;
 222        struct fb_par_control par;
 223        int err;
 224
 225        if((err = control_var_to_par(&info->var, &par, info))) {
 226                printk (KERN_ERR "controlfb_set_par: error calling"
 227                                 " control_var_to_par: %d.\n", err);
 228                return err;
 229        }
 230        
 231        control_set_hardware(p, &par);
 232
 233        info->fix.visual = (p->par.cmode == CMODE_8) ?
 234                FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
 235        info->fix.line_length = p->par.pitch;
 236        info->fix.xpanstep = 32 >> p->par.cmode;
 237        info->fix.ypanstep = 1;
 238
 239        return 0;
 240}
 241
 242/*
 243 * Set screen start address according to var offset values
 244 */
 245static inline void set_screen_start(int xoffset, int yoffset,
 246        struct fb_info_control *p)
 247{
 248        struct fb_par_control *par = &p->par;
 249
 250        par->xoffset = xoffset;
 251        par->yoffset = yoffset;
 252        out_le32(CNTRL_REG(p,start_addr),
 253                 par->yoffset * par->pitch + (par->xoffset << par->cmode));
 254}
 255
 256
 257static int controlfb_pan_display(struct fb_var_screeninfo *var,
 258                                 struct fb_info *info)
 259{
 260        unsigned int xoffset, hstep;
 261        struct fb_info_control *p = (struct fb_info_control *)info;
 262        struct fb_par_control *par = &p->par;
 263
 264        /*
 265         * make sure start addr will be 32-byte aligned
 266         */
 267        hstep = 0x1f >> par->cmode;
 268        xoffset = (var->xoffset + hstep) & ~hstep;
 269
 270        if (xoffset+par->xres > par->vxres ||
 271            var->yoffset+par->yres > par->vyres)
 272                return -EINVAL;
 273
 274        set_screen_start(xoffset, var->yoffset, p);
 275
 276        return 0;
 277}
 278
 279
 280/*
 281 * Private mmap since we want to have a different caching on the framebuffer
 282 * for controlfb.
 283 * Note there's no locking in here; it's done in fb_mmap() in fbmem.c.
 284 */
 285static int controlfb_mmap(struct fb_info *info,
 286                       struct vm_area_struct *vma)
 287{
 288       unsigned long off, start;
 289       u32 len;
 290
 291       off = vma->vm_pgoff << PAGE_SHIFT;
 292
 293       /* frame buffer memory */
 294       start = info->fix.smem_start;
 295       len = PAGE_ALIGN((start & ~PAGE_MASK)+info->fix.smem_len);
 296       if (off >= len) {
 297               /* memory mapped io */
 298               off -= len;
 299               if (info->var.accel_flags)
 300                       return -EINVAL;
 301               start = info->fix.mmio_start;
 302               len = PAGE_ALIGN((start & ~PAGE_MASK)+info->fix.mmio_len);
 303               vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 304       } else {
 305               /* framebuffer */
 306               vma->vm_page_prot = pgprot_cached_wthru(vma->vm_page_prot);
 307       }
 308       start &= PAGE_MASK;
 309       if ((vma->vm_end - vma->vm_start + off) > len)
 310                return -EINVAL;
 311       off += start;
 312       vma->vm_pgoff = off >> PAGE_SHIFT;
 313       if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
 314           vma->vm_end - vma->vm_start, vma->vm_page_prot))
 315               return -EAGAIN;
 316
 317       return 0;
 318}
 319
 320static int controlfb_blank(int blank_mode, struct fb_info *info)
 321{
 322        struct fb_info_control *p = (struct fb_info_control *) info;
 323        unsigned ctrl;
 324
 325        ctrl = ld_le32(CNTRL_REG(p,ctrl));
 326        if (blank_mode > 0)
 327                switch (blank_mode) {
 328                case FB_BLANK_VSYNC_SUSPEND:
 329                        ctrl &= ~3;
 330                        break;
 331                case FB_BLANK_HSYNC_SUSPEND:
 332                        ctrl &= ~0x30;
 333                        break;
 334                case FB_BLANK_POWERDOWN:
 335                        ctrl &= ~0x33;
 336                        /* fall through */
 337                case FB_BLANK_NORMAL:
 338                        ctrl |= 0x400;
 339                        break;
 340                default:
 341                        break;
 342                }
 343        else {
 344                ctrl &= ~0x400;
 345                ctrl |= 0x33;
 346        }
 347        out_le32(CNTRL_REG(p,ctrl), ctrl);
 348
 349        return 0;
 350}
 351
 352static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 353                             u_int transp, struct fb_info *info)
 354{
 355        struct fb_info_control *p = (struct fb_info_control *) info;
 356        __u8 r, g, b;
 357
 358        if (regno > 255)
 359                return 1;
 360
 361        r = red >> 8;
 362        g = green >> 8;
 363        b = blue >> 8;
 364
 365        out_8(&p->cmap_regs->addr, regno);      /* tell clut what addr to fill  */
 366        out_8(&p->cmap_regs->lut, r);           /* send one color channel at    */
 367        out_8(&p->cmap_regs->lut, g);           /* a time...                    */
 368        out_8(&p->cmap_regs->lut, b);
 369
 370        if (regno < 16) {
 371                int i;
 372                switch (p->par.cmode) {
 373                case CMODE_16:
 374                        p->pseudo_palette[regno] =
 375                            (regno << 10) | (regno << 5) | regno;
 376                        break;
 377                case CMODE_32:
 378                        i = (regno << 8) | regno;
 379                        p->pseudo_palette[regno] = (i << 16) | i;
 380                        break;
 381                }
 382        }
 383
 384        return 0;
 385}
 386
 387
 388/********************  End of controlfb_ops implementation  ******************/
 389
 390
 391
 392static void set_control_clock(unsigned char *params)
 393{
 394#ifdef CONFIG_ADB_CUDA
 395        struct adb_request req;
 396        int i;
 397
 398        for (i = 0; i < 3; ++i) {
 399                cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
 400                             0x50, i + 1, params[i]);
 401                while (!req.complete)
 402                        cuda_poll();
 403        }
 404#endif  
 405}
 406
 407
 408/*
 409 * finish off the driver initialization and register
 410 */
 411static int __init init_control(struct fb_info_control *p)
 412{
 413        int full, sense, vmode, cmode, vyres;
 414        struct fb_var_screeninfo var;
 415        int rc;
 416        
 417        printk(KERN_INFO "controlfb: ");
 418
 419        full = p->total_vram == 0x400000;
 420
 421        /* Try to pick a video mode out of NVRAM if we have one. */
 422#ifdef CONFIG_NVRAM
 423        if (default_cmode == CMODE_NVRAM) {
 424                cmode = nvram_read_byte(NV_CMODE);
 425                if(cmode < CMODE_8 || cmode > CMODE_32)
 426                        cmode = CMODE_8;
 427        } else
 428#endif
 429                cmode=default_cmode;
 430#ifdef CONFIG_NVRAM
 431        if (default_vmode == VMODE_NVRAM) {
 432                vmode = nvram_read_byte(NV_VMODE);
 433                if (vmode < 1 || vmode > VMODE_MAX ||
 434                    control_mac_modes[vmode - 1].m[full] < cmode) {
 435                        sense = read_control_sense(p);
 436                        printk("Monitor sense value = 0x%x, ", sense);
 437                        vmode = mac_map_monitor_sense(sense);
 438                        if (control_mac_modes[vmode - 1].m[full] < cmode)
 439                                vmode = VMODE_640_480_60;
 440                }
 441        } else
 442#endif
 443        {
 444                vmode=default_vmode;
 445                if (control_mac_modes[vmode - 1].m[full] < cmode) {
 446                        if (cmode > CMODE_8)
 447                                cmode--;
 448                        else
 449                                vmode = VMODE_640_480_60;
 450                }
 451        }
 452
 453        /* Initialize info structure */
 454        control_init_info(&p->info, p);
 455
 456        /* Setup default var */
 457        if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
 458                /* This shouldn't happen! */
 459                printk("mac_vmode_to_var(%d, %d,) failed\n", vmode, cmode);
 460try_again:
 461                vmode = VMODE_640_480_60;
 462                cmode = CMODE_8;
 463                if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
 464                        printk(KERN_ERR "controlfb: mac_vmode_to_var() failed\n");
 465                        return -ENXIO;
 466                }
 467                printk(KERN_INFO "controlfb: ");
 468        }
 469        printk("using video mode %d and color mode %d.\n", vmode, cmode);
 470
 471        vyres = (p->total_vram - CTRLFB_OFF) / (var.xres << cmode);
 472        if (vyres > var.yres)
 473                var.yres_virtual = vyres;
 474
 475        /* Apply default var */
 476        var.activate = FB_ACTIVATE_NOW;
 477        rc = fb_set_var(&p->info, &var);
 478        if (rc && (vmode != VMODE_640_480_60 || cmode != CMODE_8))
 479                goto try_again;
 480
 481        /* Register with fbdev layer */
 482        if (register_framebuffer(&p->info) < 0)
 483                return -ENXIO;
 484        
 485        printk(KERN_INFO "fb%d: control display adapter\n", p->info.node);      
 486
 487        return 0;
 488}
 489
 490#define RADACAL_WRITE(a,d) \
 491        out_8(&p->cmap_regs->addr, (a)); \
 492        out_8(&p->cmap_regs->dat,   (d))
 493
 494/* Now how about actually saying, Make it so! */
 495/* Some things in here probably don't need to be done each time. */
 496static void control_set_hardware(struct fb_info_control *p, struct fb_par_control *par)
 497{
 498        struct control_regvals  *r;
 499        volatile struct preg    __iomem *rp;
 500        int                     i, cmode;
 501
 502        if (PAR_EQUAL(&p->par, par)) {
 503                /*
 504                 * check if only xoffset or yoffset differs.
 505                 * this prevents flickers in typical VT switch case.
 506                 */
 507                if (p->par.xoffset != par->xoffset ||
 508                    p->par.yoffset != par->yoffset)
 509                        set_screen_start(par->xoffset, par->yoffset, p);
 510                        
 511                return;
 512        }
 513        
 514        p->par = *par;
 515        cmode = p->par.cmode;
 516        r = &par->regvals;
 517        
 518        /* Turn off display */
 519        out_le32(CNTRL_REG(p,ctrl), 0x400 | par->ctrl);
 520        
 521        set_control_clock(r->clock_params);
 522        
 523        RADACAL_WRITE(0x20, r->radacal_ctrl);
 524        RADACAL_WRITE(0x21, p->control_use_bank2 ? 0 : 1);
 525        RADACAL_WRITE(0x10, 0);
 526        RADACAL_WRITE(0x11, 0);
 527
 528        rp = &p->control_regs->vswin;
 529        for (i = 0; i < 16; ++i, ++rp)
 530                out_le32(&rp->r, r->regs[i]);
 531        
 532        out_le32(CNTRL_REG(p,pitch), par->pitch);
 533        out_le32(CNTRL_REG(p,mode), r->mode);
 534        out_le32(CNTRL_REG(p,vram_attr), p->vram_attr);
 535        out_le32(CNTRL_REG(p,start_addr), par->yoffset * par->pitch
 536                 + (par->xoffset << cmode));
 537        out_le32(CNTRL_REG(p,rfrcnt), 0x1e5);
 538        out_le32(CNTRL_REG(p,intr_ena), 0);
 539
 540        /* Turn on display */
 541        out_le32(CNTRL_REG(p,ctrl), par->ctrl);
 542
 543#ifdef CONFIG_BOOTX_TEXT
 544        btext_update_display(p->frame_buffer_phys + CTRLFB_OFF,
 545                             p->par.xres, p->par.yres,
 546                             (cmode == CMODE_32? 32: cmode == CMODE_16? 16: 8),
 547                             p->par.pitch);
 548#endif /* CONFIG_BOOTX_TEXT */
 549}
 550
 551
 552/*
 553 * Parse user specified options (`video=controlfb:')
 554 */
 555static void __init control_setup(char *options)
 556{
 557        char *this_opt;
 558
 559        if (!options || !*options)
 560                return;
 561
 562        while ((this_opt = strsep(&options, ",")) != NULL) {
 563                if (!strncmp(this_opt, "vmode:", 6)) {
 564                        int vmode = simple_strtoul(this_opt+6, NULL, 0);
 565                        if (vmode > 0 && vmode <= VMODE_MAX &&
 566                            control_mac_modes[vmode - 1].m[1] >= 0)
 567                                default_vmode = vmode;
 568                } else if (!strncmp(this_opt, "cmode:", 6)) {
 569                        int depth = simple_strtoul(this_opt+6, NULL, 0);
 570                        switch (depth) {
 571                         case CMODE_8:
 572                         case CMODE_16:
 573                         case CMODE_32:
 574                                default_cmode = depth;
 575                                break;
 576                         case 8:
 577                                default_cmode = CMODE_8;
 578                                break;
 579                         case 15:
 580                         case 16:
 581                                default_cmode = CMODE_16;
 582                                break;
 583                         case 24:
 584                         case 32:
 585                                default_cmode = CMODE_32;
 586                                break;
 587                        }
 588                }
 589        }
 590}
 591
 592static int __init control_init(void)
 593{
 594        struct device_node *dp;
 595        char *option = NULL;
 596        int ret = -ENXIO;
 597
 598        if (fb_get_options("controlfb", &option))
 599                return -ENODEV;
 600        control_setup(option);
 601
 602        dp = of_find_node_by_name(NULL, "control");
 603        if (dp != 0 && !control_of_init(dp))
 604                ret = 0;
 605        of_node_put(dp);
 606
 607        return ret;
 608}
 609
 610module_init(control_init);
 611
 612/* Work out which banks of VRAM we have installed. */
 613/* danj: I guess the card just ignores writes to nonexistant VRAM... */
 614
 615static void __init find_vram_size(struct fb_info_control *p)
 616{
 617        int bank1, bank2;
 618
 619        /*
 620         * Set VRAM in 2MB (bank 1) mode
 621         * VRAM Bank 2 will be accessible through offset 0x600000 if present
 622         * and VRAM Bank 1 will not respond at that offset even if present
 623         */
 624        out_le32(CNTRL_REG(p,vram_attr), 0x31);
 625
 626        out_8(&p->frame_buffer[0x600000], 0xb3);
 627        out_8(&p->frame_buffer[0x600001], 0x71);
 628        asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0x600000])
 629                                        : "memory" );
 630        mb();
 631        asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0x600000])
 632                                        : "memory" );
 633        mb();
 634
 635        bank2 = (in_8(&p->frame_buffer[0x600000]) == 0xb3)
 636                && (in_8(&p->frame_buffer[0x600001]) == 0x71);
 637
 638        /*
 639         * Set VRAM in 2MB (bank 2) mode
 640         * VRAM Bank 1 will be accessible through offset 0x000000 if present
 641         * and VRAM Bank 2 will not respond at that offset even if present
 642         */
 643        out_le32(CNTRL_REG(p,vram_attr), 0x39);
 644
 645        out_8(&p->frame_buffer[0], 0x5a);
 646        out_8(&p->frame_buffer[1], 0xc7);
 647        asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0])
 648                                        : "memory" );
 649        mb();
 650        asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0])
 651                                        : "memory" );
 652        mb();
 653
 654        bank1 = (in_8(&p->frame_buffer[0]) == 0x5a)
 655                && (in_8(&p->frame_buffer[1]) == 0xc7);
 656
 657        if (bank2) {
 658                if (!bank1) {
 659                        /*
 660                         * vram bank 2 only
 661                         */
 662                        p->control_use_bank2 = 1;
 663                        p->vram_attr = 0x39;
 664                        p->frame_buffer += 0x600000;
 665                        p->frame_buffer_phys += 0x600000;
 666                } else {
 667                        /*
 668                         * 4 MB vram
 669                         */
 670                        p->vram_attr = 0x51;
 671                }
 672        } else {
 673                /*
 674                 * vram bank 1 only
 675                 */
 676                p->vram_attr = 0x31;
 677        }
 678
 679        p->total_vram = (bank1 + bank2) * 0x200000;
 680
 681        printk(KERN_INFO "controlfb: VRAM Total = %dMB "
 682                        "(%dMB @ bank 1, %dMB @ bank 2)\n",
 683                        (bank1 + bank2) << 1, bank1 << 1, bank2 << 1);
 684}
 685
 686
 687/*
 688 * find "control" and initialize
 689 */
 690static int __init control_of_init(struct device_node *dp)
 691{
 692        struct fb_info_control  *p;
 693        struct resource         fb_res, reg_res;
 694
 695        if (control_fb) {
 696                printk(KERN_ERR "controlfb: only one control is supported\n");
 697                return -ENXIO;
 698        }
 699
 700        if (of_pci_address_to_resource(dp, 2, &fb_res) ||
 701            of_pci_address_to_resource(dp, 1, &reg_res)) {
 702                printk(KERN_ERR "can't get 2 addresses for control\n");
 703                return -ENXIO;
 704        }
 705        p = kzalloc(sizeof(*p), GFP_KERNEL);
 706        if (p == 0)
 707                return -ENXIO;
 708        control_fb = p; /* save it for cleanups */
 709
 710        /* Map in frame buffer and registers */
 711        p->fb_orig_base = fb_res.start;
 712        p->fb_orig_size = resource_size(&fb_res);
 713        /* use the big-endian aperture (??) */
 714        p->frame_buffer_phys = fb_res.start + 0x800000;
 715        p->control_regs_phys = reg_res.start;
 716        p->control_regs_size = resource_size(&reg_res);
 717
 718        if (!p->fb_orig_base ||
 719            !request_mem_region(p->fb_orig_base,p->fb_orig_size,"controlfb")) {
 720                p->fb_orig_base = 0;
 721                goto error_out;
 722        }
 723        /* map at most 8MB for the frame buffer */
 724        p->frame_buffer = __ioremap(p->frame_buffer_phys, 0x800000,
 725                                    _PAGE_WRITETHRU);
 726
 727        if (!p->control_regs_phys ||
 728            !request_mem_region(p->control_regs_phys, p->control_regs_size,
 729            "controlfb regs")) {
 730                p->control_regs_phys = 0;
 731                goto error_out;
 732        }
 733        p->control_regs = ioremap(p->control_regs_phys, p->control_regs_size);
 734
 735        p->cmap_regs_phys = 0xf301b000;  /* XXX not in prom? */
 736        if (!request_mem_region(p->cmap_regs_phys, 0x1000, "controlfb cmap")) {
 737                p->cmap_regs_phys = 0;
 738                goto error_out;
 739        }
 740        p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
 741
 742        if (!p->cmap_regs || !p->control_regs || !p->frame_buffer)
 743                goto error_out;
 744
 745        find_vram_size(p);
 746        if (!p->total_vram)
 747                goto error_out;
 748
 749        if (init_control(p) < 0)
 750                goto error_out;
 751
 752        return 0;
 753
 754error_out:
 755        control_cleanup();
 756        return -ENXIO;
 757}
 758
 759/*
 760 * Get the monitor sense value.
 761 * Note that this can be called before calibrate_delay,
 762 * so we can't use udelay.
 763 */
 764static int read_control_sense(struct fb_info_control *p)
 765{
 766        int sense;
 767
 768        out_le32(CNTRL_REG(p,mon_sense), 7);    /* drive all lines high */
 769        __delay(200);
 770        out_le32(CNTRL_REG(p,mon_sense), 077);  /* turn off drivers */
 771        __delay(2000);
 772        sense = (in_le32(CNTRL_REG(p,mon_sense)) & 0x1c0) << 2;
 773
 774        /* drive each sense line low in turn and collect the other 2 */
 775        out_le32(CNTRL_REG(p,mon_sense), 033);  /* drive A low */
 776        __delay(2000);
 777        sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0xc0) >> 2;
 778        out_le32(CNTRL_REG(p,mon_sense), 055);  /* drive B low */
 779        __delay(2000);
 780        sense |= ((in_le32(CNTRL_REG(p,mon_sense)) & 0x100) >> 5)
 781                | ((in_le32(CNTRL_REG(p,mon_sense)) & 0x40) >> 4);
 782        out_le32(CNTRL_REG(p,mon_sense), 066);  /* drive C low */
 783        __delay(2000);
 784        sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0x180) >> 7;
 785
 786        out_le32(CNTRL_REG(p,mon_sense), 077);  /* turn off drivers */
 787        
 788        return sense;
 789}
 790
 791/**********************  Various translation functions  **********************/
 792
 793#define CONTROL_PIXCLOCK_BASE   256016
 794#define CONTROL_PIXCLOCK_MIN    5000    /* ~ 200 MHz dot clock */
 795
 796/*
 797 * calculate the clock paramaters to be sent to CUDA according to given
 798 * pixclock in pico second.
 799 */
 800static int calc_clock_params(unsigned long clk, unsigned char *param)
 801{
 802        unsigned long p0, p1, p2, k, l, m, n, min;
 803
 804        if (clk > (CONTROL_PIXCLOCK_BASE << 3))
 805                return 1;
 806
 807        p2 = ((clk << 4) < CONTROL_PIXCLOCK_BASE)? 3: 2;
 808        l = clk << p2;
 809        p0 = 0;
 810        p1 = 0;
 811        for (k = 1, min = l; k < 32; k++) {
 812                unsigned long rem;
 813
 814                m = CONTROL_PIXCLOCK_BASE * k;
 815                n = m / l;
 816                rem = m % l;
 817                if (n && (n < 128) && rem < min) {
 818                        p0 = k;
 819                        p1 = n;
 820                        min = rem;
 821                }
 822        }
 823        if (!p0 || !p1)
 824                return 1;
 825
 826        param[0] = p0;
 827        param[1] = p1;
 828        param[2] = p2;
 829
 830        return 0;
 831}
 832
 833
 834/*
 835 * This routine takes a user-supplied var, and picks the best vmode/cmode
 836 * from it.
 837 */
 838
 839static int control_var_to_par(struct fb_var_screeninfo *var,
 840        struct fb_par_control *par, const struct fb_info *fb_info)
 841{
 842        int cmode, piped_diff, hstep;
 843        unsigned hperiod, hssync, hsblank, hesync, heblank, piped, heq, hlfln,
 844                 hserr, vperiod, vssync, vesync, veblank, vsblank, vswin, vewin;
 845        unsigned long pixclock;
 846        struct fb_info_control *p = (struct fb_info_control *) fb_info;
 847        struct control_regvals *r = &par->regvals;
 848
 849        switch (var->bits_per_pixel) {
 850        case 8:
 851                par->cmode = CMODE_8;
 852                if (p->total_vram > 0x200000) {
 853                        r->mode = 3;
 854                        r->radacal_ctrl = 0x20;
 855                        piped_diff = 13;
 856                } else {
 857                        r->mode = 2;
 858                        r->radacal_ctrl = 0x10;
 859                        piped_diff = 9;
 860                }
 861                break;
 862        case 15:
 863        case 16:
 864                par->cmode = CMODE_16;
 865                if (p->total_vram > 0x200000) {
 866                        r->mode = 2;
 867                        r->radacal_ctrl = 0x24;
 868                        piped_diff = 5;
 869                } else {
 870                        r->mode = 1;
 871                        r->radacal_ctrl = 0x14;
 872                        piped_diff = 3;
 873                }
 874                break;
 875        case 32:
 876                par->cmode = CMODE_32;
 877                if (p->total_vram > 0x200000) {
 878                        r->mode = 1;
 879                        r->radacal_ctrl = 0x28;
 880                } else {
 881                        r->mode = 0;
 882                        r->radacal_ctrl = 0x18;
 883                }
 884                piped_diff = 1;
 885                break;
 886        default:
 887                return -EINVAL;
 888        }
 889
 890        /*
 891         * adjust xres and vxres so that the corresponding memory widths are
 892         * 32-byte aligned
 893         */
 894        hstep = 31 >> par->cmode;
 895        par->xres = (var->xres + hstep) & ~hstep;
 896        par->vxres = (var->xres_virtual + hstep) & ~hstep;
 897        par->xoffset = (var->xoffset + hstep) & ~hstep;
 898        if (par->vxres < par->xres)
 899                par->vxres = par->xres;
 900        par->pitch = par->vxres << par->cmode;
 901
 902        par->yres = var->yres;
 903        par->vyres = var->yres_virtual;
 904        par->yoffset = var->yoffset;
 905        if (par->vyres < par->yres)
 906                par->vyres = par->yres;
 907
 908        par->sync = var->sync;
 909
 910        if (par->pitch * par->vyres + CTRLFB_OFF > p->total_vram)
 911                return -EINVAL;
 912
 913        if (par->xoffset + par->xres > par->vxres)
 914                par->xoffset = par->vxres - par->xres;
 915        if (par->yoffset + par->yres > par->vyres)
 916                par->yoffset = par->vyres - par->yres;
 917
 918        pixclock = (var->pixclock < CONTROL_PIXCLOCK_MIN)? CONTROL_PIXCLOCK_MIN:
 919                   var->pixclock;
 920        if (calc_clock_params(pixclock, r->clock_params))
 921                return -EINVAL;
 922
 923        hperiod = ((var->left_margin + par->xres + var->right_margin
 924                    + var->hsync_len) >> 1) - 2;
 925        hssync = hperiod + 1;
 926        hsblank = hssync - (var->right_margin >> 1);
 927        hesync = (var->hsync_len >> 1) - 1;
 928        heblank = (var->left_margin >> 1) + hesync;
 929        piped = heblank - piped_diff;
 930        heq = var->hsync_len >> 2;
 931        hlfln = (hperiod+2) >> 1;
 932        hserr = hssync-hesync;
 933        vperiod = (var->vsync_len + var->lower_margin + par->yres
 934                   + var->upper_margin) << 1;
 935        vssync = vperiod - 2;
 936        vesync = (var->vsync_len << 1) - vperiod + vssync;
 937        veblank = (var->upper_margin << 1) + vesync;
 938        vsblank = vssync - (var->lower_margin << 1);
 939        vswin = (vsblank+vssync) >> 1;
 940        vewin = (vesync+veblank) >> 1;
 941
 942        r->regs[0] = vswin;
 943        r->regs[1] = vsblank;
 944        r->regs[2] = veblank;
 945        r->regs[3] = vewin;
 946        r->regs[4] = vesync;
 947        r->regs[5] = vssync;
 948        r->regs[6] = vperiod;
 949        r->regs[7] = piped;
 950        r->regs[8] = hperiod;
 951        r->regs[9] = hsblank;
 952        r->regs[10] = heblank;
 953        r->regs[11] = hesync;
 954        r->regs[12] = hssync;
 955        r->regs[13] = heq;
 956        r->regs[14] = hlfln;
 957        r->regs[15] = hserr;
 958
 959        if (par->xres >= 1280 && par->cmode >= CMODE_16)
 960                par->ctrl = 0x7f;
 961        else
 962                par->ctrl = 0x3b;
 963
 964        if (mac_var_to_vmode(var, &par->vmode, &cmode))
 965                par->vmode = 0;
 966
 967        return 0;
 968}
 969
 970
 971/*
 972 * Convert hardware data in par to an fb_var_screeninfo
 973 */
 974
 975static void control_par_to_var(struct fb_par_control *par, struct fb_var_screeninfo *var)
 976{
 977        struct control_regints *rv;
 978        
 979        rv = (struct control_regints *) par->regvals.regs;
 980        
 981        memset(var, 0, sizeof(*var));
 982        var->xres = par->xres;
 983        var->yres = par->yres;
 984        var->xres_virtual = par->vxres;
 985        var->yres_virtual = par->vyres;
 986        var->xoffset = par->xoffset;
 987        var->yoffset = par->yoffset;
 988        
 989        switch(par->cmode) {
 990        default:
 991        case CMODE_8:
 992                var->bits_per_pixel = 8;
 993                var->red.length = 8;
 994                var->green.length = 8;
 995                var->blue.length = 8;
 996                break;
 997        case CMODE_16:  /* RGB 555 */
 998                var->bits_per_pixel = 16;
 999                var->red.offset = 10;
1000                var->red.length = 5;
1001                var->green.offset = 5;
1002                var->green.length = 5;
1003                var->blue.length = 5;
1004                break;
1005        case CMODE_32:  /* RGB 888 */
1006                var->bits_per_pixel = 32;
1007                var->red.offset = 16;
1008                var->red.length = 8;
1009                var->green.offset = 8;
1010                var->green.length = 8;
1011                var->blue.length = 8;
1012                var->transp.offset = 24;
1013                var->transp.length = 8;
1014                break;
1015        }
1016        var->height = -1;
1017        var->width = -1;
1018        var->vmode = FB_VMODE_NONINTERLACED;
1019
1020        var->left_margin = (rv->heblank - rv->hesync) << 1;
1021        var->right_margin = (rv->hssync - rv->hsblank) << 1;
1022        var->hsync_len = (rv->hperiod + 2 - rv->hssync + rv->hesync) << 1;
1023
1024        var->upper_margin = (rv->veblank - rv->vesync) >> 1;
1025        var->lower_margin = (rv->vssync - rv->vsblank) >> 1;
1026        var->vsync_len = (rv->vperiod - rv->vssync + rv->vesync) >> 1;
1027
1028        var->sync = par->sync;
1029
1030        /*
1031         * 10^12 * clock_params[0] / (3906400 * clock_params[1]
1032         *                            * 2^clock_params[2])
1033         * (10^12 * clock_params[0] / (3906400 * clock_params[1]))
1034         * >> clock_params[2]
1035         */
1036        /* (255990.17 * clock_params[0] / clock_params[1]) >> clock_params[2] */
1037        var->pixclock = CONTROL_PIXCLOCK_BASE * par->regvals.clock_params[0];
1038        var->pixclock /= par->regvals.clock_params[1];
1039        var->pixclock >>= par->regvals.clock_params[2];
1040}
1041
1042/*
1043 * Set misc info vars for this driver
1044 */
1045static void __init control_init_info(struct fb_info *info, struct fb_info_control *p)
1046{
1047        /* Fill fb_info */
1048        info->par = &p->par;
1049        info->fbops = &controlfb_ops;
1050        info->pseudo_palette = p->pseudo_palette;
1051        info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
1052        info->screen_base = p->frame_buffer + CTRLFB_OFF;
1053
1054        fb_alloc_cmap(&info->cmap, 256, 0);
1055
1056        /* Fill fix common fields */
1057        strcpy(info->fix.id, "control");
1058        info->fix.mmio_start = p->control_regs_phys;
1059        info->fix.mmio_len = sizeof(struct control_regs);
1060        info->fix.type = FB_TYPE_PACKED_PIXELS;
1061        info->fix.smem_start = p->frame_buffer_phys + CTRLFB_OFF;
1062        info->fix.smem_len = p->total_vram - CTRLFB_OFF;
1063        info->fix.ywrapstep = 0;
1064        info->fix.type_aux = 0;
1065        info->fix.accel = FB_ACCEL_NONE;
1066}
1067
1068
1069static void control_cleanup(void)
1070{
1071        struct fb_info_control  *p = control_fb;
1072
1073        if (!p)
1074                return;
1075
1076        if (p->cmap_regs)
1077                iounmap(p->cmap_regs);
1078        if (p->control_regs)
1079                iounmap(p->control_regs);
1080        if (p->frame_buffer) {
1081                if (p->control_use_bank2)
1082                        p->frame_buffer -= 0x600000;
1083                iounmap(p->frame_buffer);
1084        }
1085        if (p->cmap_regs_phys)
1086                release_mem_region(p->cmap_regs_phys, 0x1000);
1087        if (p->control_regs_phys)
1088                release_mem_region(p->control_regs_phys, p->control_regs_size);
1089        if (p->fb_orig_base)
1090                release_mem_region(p->fb_orig_base, p->fb_orig_size);
1091        kfree(p);
1092}
1093
1094
1095
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