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 mmio_pgoff;
 289        unsigned long start;
 290        u32 len;
 291
 292        start = info->fix.smem_start;
 293        len = info->fix.smem_len;
 294        mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
 295        if (vma->vm_pgoff >= mmio_pgoff) {
 296                if (info->var.accel_flags)
 297                        return -EINVAL;
 298                vma->vm_pgoff -= mmio_pgoff;
 299                start = info->fix.mmio_start;
 300                len = info->fix.mmio_len;
 301                vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 302        } else {
 303                /* framebuffer */
 304                vma->vm_page_prot = pgprot_cached_wthru(vma->vm_page_prot);
 305        }
 306
 307        return vm_iomap_memory(vma, start, len);
 308}
 309
 310static int controlfb_blank(int blank_mode, struct fb_info *info)
 311{
 312        struct fb_info_control *p = (struct fb_info_control *) info;
 313        unsigned ctrl;
 314
 315        ctrl = ld_le32(CNTRL_REG(p,ctrl));
 316        if (blank_mode > 0)
 317                switch (blank_mode) {
 318                case FB_BLANK_VSYNC_SUSPEND:
 319                        ctrl &= ~3;
 320                        break;
 321                case FB_BLANK_HSYNC_SUSPEND:
 322                        ctrl &= ~0x30;
 323                        break;
 324                case FB_BLANK_POWERDOWN:
 325                        ctrl &= ~0x33;
 326                        /* fall through */
 327                case FB_BLANK_NORMAL:
 328                        ctrl |= 0x400;
 329                        break;
 330                default:
 331                        break;
 332                }
 333        else {
 334                ctrl &= ~0x400;
 335                ctrl |= 0x33;
 336        }
 337        out_le32(CNTRL_REG(p,ctrl), ctrl);
 338
 339        return 0;
 340}
 341
 342static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 343                             u_int transp, struct fb_info *info)
 344{
 345        struct fb_info_control *p = (struct fb_info_control *) info;
 346        __u8 r, g, b;
 347
 348        if (regno > 255)
 349                return 1;
 350
 351        r = red >> 8;
 352        g = green >> 8;
 353        b = blue >> 8;
 354
 355        out_8(&p->cmap_regs->addr, regno);      /* tell clut what addr to fill  */
 356        out_8(&p->cmap_regs->lut, r);           /* send one color channel at    */
 357        out_8(&p->cmap_regs->lut, g);           /* a time...                    */
 358        out_8(&p->cmap_regs->lut, b);
 359
 360        if (regno < 16) {
 361                int i;
 362                switch (p->par.cmode) {
 363                case CMODE_16:
 364                        p->pseudo_palette[regno] =
 365                            (regno << 10) | (regno << 5) | regno;
 366                        break;
 367                case CMODE_32:
 368                        i = (regno << 8) | regno;
 369                        p->pseudo_palette[regno] = (i << 16) | i;
 370                        break;
 371                }
 372        }
 373
 374        return 0;
 375}
 376
 377
 378/********************  End of controlfb_ops implementation  ******************/
 379
 380
 381
 382static void set_control_clock(unsigned char *params)
 383{
 384#ifdef CONFIG_ADB_CUDA
 385        struct adb_request req;
 386        int i;
 387
 388        for (i = 0; i < 3; ++i) {
 389                cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
 390                             0x50, i + 1, params[i]);
 391                while (!req.complete)
 392                        cuda_poll();
 393        }
 394#endif  
 395}
 396
 397
 398/*
 399 * finish off the driver initialization and register
 400 */
 401static int __init init_control(struct fb_info_control *p)
 402{
 403        int full, sense, vmode, cmode, vyres;
 404        struct fb_var_screeninfo var;
 405        int rc;
 406        
 407        printk(KERN_INFO "controlfb: ");
 408
 409        full = p->total_vram == 0x400000;
 410
 411        /* Try to pick a video mode out of NVRAM if we have one. */
 412#ifdef CONFIG_NVRAM
 413        if (default_cmode == CMODE_NVRAM) {
 414                cmode = nvram_read_byte(NV_CMODE);
 415                if(cmode < CMODE_8 || cmode > CMODE_32)
 416                        cmode = CMODE_8;
 417        } else
 418#endif
 419                cmode=default_cmode;
 420#ifdef CONFIG_NVRAM
 421        if (default_vmode == VMODE_NVRAM) {
 422                vmode = nvram_read_byte(NV_VMODE);
 423                if (vmode < 1 || vmode > VMODE_MAX ||
 424                    control_mac_modes[vmode - 1].m[full] < cmode) {
 425                        sense = read_control_sense(p);
 426                        printk("Monitor sense value = 0x%x, ", sense);
 427                        vmode = mac_map_monitor_sense(sense);
 428                        if (control_mac_modes[vmode - 1].m[full] < cmode)
 429                                vmode = VMODE_640_480_60;
 430                }
 431        } else
 432#endif
 433        {
 434                vmode=default_vmode;
 435                if (control_mac_modes[vmode - 1].m[full] < cmode) {
 436                        if (cmode > CMODE_8)
 437                                cmode--;
 438                        else
 439                                vmode = VMODE_640_480_60;
 440                }
 441        }
 442
 443        /* Initialize info structure */
 444        control_init_info(&p->info, p);
 445
 446        /* Setup default var */
 447        if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
 448                /* This shouldn't happen! */
 449                printk("mac_vmode_to_var(%d, %d,) failed\n", vmode, cmode);
 450try_again:
 451                vmode = VMODE_640_480_60;
 452                cmode = CMODE_8;
 453                if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
 454                        printk(KERN_ERR "controlfb: mac_vmode_to_var() failed\n");
 455                        return -ENXIO;
 456                }
 457                printk(KERN_INFO "controlfb: ");
 458        }
 459        printk("using video mode %d and color mode %d.\n", vmode, cmode);
 460
 461        vyres = (p->total_vram - CTRLFB_OFF) / (var.xres << cmode);
 462        if (vyres > var.yres)
 463                var.yres_virtual = vyres;
 464
 465        /* Apply default var */
 466        var.activate = FB_ACTIVATE_NOW;
 467        rc = fb_set_var(&p->info, &var);
 468        if (rc && (vmode != VMODE_640_480_60 || cmode != CMODE_8))
 469                goto try_again;
 470
 471        /* Register with fbdev layer */
 472        if (register_framebuffer(&p->info) < 0)
 473                return -ENXIO;
 474        
 475        printk(KERN_INFO "fb%d: control display adapter\n", p->info.node);      
 476
 477        return 0;
 478}
 479
 480#define RADACAL_WRITE(a,d) \
 481        out_8(&p->cmap_regs->addr, (a)); \
 482        out_8(&p->cmap_regs->dat,   (d))
 483
 484/* Now how about actually saying, Make it so! */
 485/* Some things in here probably don't need to be done each time. */
 486static void control_set_hardware(struct fb_info_control *p, struct fb_par_control *par)
 487{
 488        struct control_regvals  *r;
 489        volatile struct preg    __iomem *rp;
 490        int                     i, cmode;
 491
 492        if (PAR_EQUAL(&p->par, par)) {
 493                /*
 494                 * check if only xoffset or yoffset differs.
 495                 * this prevents flickers in typical VT switch case.
 496                 */
 497                if (p->par.xoffset != par->xoffset ||
 498                    p->par.yoffset != par->yoffset)
 499                        set_screen_start(par->xoffset, par->yoffset, p);
 500                        
 501                return;
 502        }
 503        
 504        p->par = *par;
 505        cmode = p->par.cmode;
 506        r = &par->regvals;
 507        
 508        /* Turn off display */
 509        out_le32(CNTRL_REG(p,ctrl), 0x400 | par->ctrl);
 510        
 511        set_control_clock(r->clock_params);
 512        
 513        RADACAL_WRITE(0x20, r->radacal_ctrl);
 514        RADACAL_WRITE(0x21, p->control_use_bank2 ? 0 : 1);
 515        RADACAL_WRITE(0x10, 0);
 516        RADACAL_WRITE(0x11, 0);
 517
 518        rp = &p->control_regs->vswin;
 519        for (i = 0; i < 16; ++i, ++rp)
 520                out_le32(&rp->r, r->regs[i]);
 521        
 522        out_le32(CNTRL_REG(p,pitch), par->pitch);
 523        out_le32(CNTRL_REG(p,mode), r->mode);
 524        out_le32(CNTRL_REG(p,vram_attr), p->vram_attr);
 525        out_le32(CNTRL_REG(p,start_addr), par->yoffset * par->pitch
 526                 + (par->xoffset << cmode));
 527        out_le32(CNTRL_REG(p,rfrcnt), 0x1e5);
 528        out_le32(CNTRL_REG(p,intr_ena), 0);
 529
 530        /* Turn on display */
 531        out_le32(CNTRL_REG(p,ctrl), par->ctrl);
 532
 533#ifdef CONFIG_BOOTX_TEXT
 534        btext_update_display(p->frame_buffer_phys + CTRLFB_OFF,
 535                             p->par.xres, p->par.yres,
 536                             (cmode == CMODE_32? 32: cmode == CMODE_16? 16: 8),
 537                             p->par.pitch);
 538#endif /* CONFIG_BOOTX_TEXT */
 539}
 540
 541
 542/*
 543 * Parse user specified options (`video=controlfb:')
 544 */
 545static void __init control_setup(char *options)
 546{
 547        char *this_opt;
 548
 549        if (!options || !*options)
 550                return;
 551
 552        while ((this_opt = strsep(&options, ",")) != NULL) {
 553                if (!strncmp(this_opt, "vmode:", 6)) {
 554                        int vmode = simple_strtoul(this_opt+6, NULL, 0);
 555                        if (vmode > 0 && vmode <= VMODE_MAX &&
 556                            control_mac_modes[vmode - 1].m[1] >= 0)
 557                                default_vmode = vmode;
 558                } else if (!strncmp(this_opt, "cmode:", 6)) {
 559                        int depth = simple_strtoul(this_opt+6, NULL, 0);
 560                        switch (depth) {
 561                         case CMODE_8:
 562                         case CMODE_16:
 563                         case CMODE_32:
 564                                default_cmode = depth;
 565                                break;
 566                         case 8:
 567                                default_cmode = CMODE_8;
 568                                break;
 569                         case 15:
 570                         case 16:
 571                                default_cmode = CMODE_16;
 572                                break;
 573                         case 24:
 574                         case 32:
 575                                default_cmode = CMODE_32;
 576                                break;
 577                        }
 578                }
 579        }
 580}
 581
 582static int __init control_init(void)
 583{
 584        struct device_node *dp;
 585        char *option = NULL;
 586        int ret = -ENXIO;
 587
 588        if (fb_get_options("controlfb", &option))
 589                return -ENODEV;
 590        control_setup(option);
 591
 592        dp = of_find_node_by_name(NULL, "control");
 593        if (dp != 0 && !control_of_init(dp))
 594                ret = 0;
 595        of_node_put(dp);
 596
 597        return ret;
 598}
 599
 600module_init(control_init);
 601
 602/* Work out which banks of VRAM we have installed. */
 603/* danj: I guess the card just ignores writes to nonexistant VRAM... */
 604
 605static void __init find_vram_size(struct fb_info_control *p)
 606{
 607        int bank1, bank2;
 608
 609        /*
 610         * Set VRAM in 2MB (bank 1) mode
 611         * VRAM Bank 2 will be accessible through offset 0x600000 if present
 612         * and VRAM Bank 1 will not respond at that offset even if present
 613         */
 614        out_le32(CNTRL_REG(p,vram_attr), 0x31);
 615
 616        out_8(&p->frame_buffer[0x600000], 0xb3);
 617        out_8(&p->frame_buffer[0x600001], 0x71);
 618        asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0x600000])
 619                                        : "memory" );
 620        mb();
 621        asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0x600000])
 622                                        : "memory" );
 623        mb();
 624
 625        bank2 = (in_8(&p->frame_buffer[0x600000]) == 0xb3)
 626                && (in_8(&p->frame_buffer[0x600001]) == 0x71);
 627
 628        /*
 629         * Set VRAM in 2MB (bank 2) mode
 630         * VRAM Bank 1 will be accessible through offset 0x000000 if present
 631         * and VRAM Bank 2 will not respond at that offset even if present
 632         */
 633        out_le32(CNTRL_REG(p,vram_attr), 0x39);
 634
 635        out_8(&p->frame_buffer[0], 0x5a);
 636        out_8(&p->frame_buffer[1], 0xc7);
 637        asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0])
 638                                        : "memory" );
 639        mb();
 640        asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0])
 641                                        : "memory" );
 642        mb();
 643
 644        bank1 = (in_8(&p->frame_buffer[0]) == 0x5a)
 645                && (in_8(&p->frame_buffer[1]) == 0xc7);
 646
 647        if (bank2) {
 648                if (!bank1) {
 649                        /*
 650                         * vram bank 2 only
 651                         */
 652                        p->control_use_bank2 = 1;
 653                        p->vram_attr = 0x39;
 654                        p->frame_buffer += 0x600000;
 655                        p->frame_buffer_phys += 0x600000;
 656                } else {
 657                        /*
 658                         * 4 MB vram
 659                         */
 660                        p->vram_attr = 0x51;
 661                }
 662        } else {
 663                /*
 664                 * vram bank 1 only
 665                 */
 666                p->vram_attr = 0x31;
 667        }
 668
 669        p->total_vram = (bank1 + bank2) * 0x200000;
 670
 671        printk(KERN_INFO "controlfb: VRAM Total = %dMB "
 672                        "(%dMB @ bank 1, %dMB @ bank 2)\n",
 673                        (bank1 + bank2) << 1, bank1 << 1, bank2 << 1);
 674}
 675
 676
 677/*
 678 * find "control" and initialize
 679 */
 680static int __init control_of_init(struct device_node *dp)
 681{
 682        struct fb_info_control  *p;
 683        struct resource         fb_res, reg_res;
 684
 685        if (control_fb) {
 686                printk(KERN_ERR "controlfb: only one control is supported\n");
 687                return -ENXIO;
 688        }
 689
 690        if (of_pci_address_to_resource(dp, 2, &fb_res) ||
 691            of_pci_address_to_resource(dp, 1, &reg_res)) {
 692                printk(KERN_ERR "can't get 2 addresses for control\n");
 693                return -ENXIO;
 694        }
 695        p = kzalloc(sizeof(*p), GFP_KERNEL);
 696        if (p == 0)
 697                return -ENXIO;
 698        control_fb = p; /* save it for cleanups */
 699
 700        /* Map in frame buffer and registers */
 701        p->fb_orig_base = fb_res.start;
 702        p->fb_orig_size = resource_size(&fb_res);
 703        /* use the big-endian aperture (??) */
 704        p->frame_buffer_phys = fb_res.start + 0x800000;
 705        p->control_regs_phys = reg_res.start;
 706        p->control_regs_size = resource_size(&reg_res);
 707
 708        if (!p->fb_orig_base ||
 709            !request_mem_region(p->fb_orig_base,p->fb_orig_size,"controlfb")) {
 710                p->fb_orig_base = 0;
 711                goto error_out;
 712        }
 713        /* map at most 8MB for the frame buffer */
 714        p->frame_buffer = __ioremap(p->frame_buffer_phys, 0x800000,
 715                                    _PAGE_WRITETHRU);
 716
 717        if (!p->control_regs_phys ||
 718            !request_mem_region(p->control_regs_phys, p->control_regs_size,
 719            "controlfb regs")) {
 720                p->control_regs_phys = 0;
 721                goto error_out;
 722        }
 723        p->control_regs = ioremap(p->control_regs_phys, p->control_regs_size);
 724
 725        p->cmap_regs_phys = 0xf301b000;  /* XXX not in prom? */
 726        if (!request_mem_region(p->cmap_regs_phys, 0x1000, "controlfb cmap")) {
 727                p->cmap_regs_phys = 0;
 728                goto error_out;
 729        }
 730        p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
 731
 732        if (!p->cmap_regs || !p->control_regs || !p->frame_buffer)
 733                goto error_out;
 734
 735        find_vram_size(p);
 736        if (!p->total_vram)
 737                goto error_out;
 738
 739        if (init_control(p) < 0)
 740                goto error_out;
 741
 742        return 0;
 743
 744error_out:
 745        control_cleanup();
 746        return -ENXIO;
 747}
 748
 749/*
 750 * Get the monitor sense value.
 751 * Note that this can be called before calibrate_delay,
 752 * so we can't use udelay.
 753 */
 754static int read_control_sense(struct fb_info_control *p)
 755{
 756        int sense;
 757
 758        out_le32(CNTRL_REG(p,mon_sense), 7);    /* drive all lines high */
 759        __delay(200);
 760        out_le32(CNTRL_REG(p,mon_sense), 077);  /* turn off drivers */
 761        __delay(2000);
 762        sense = (in_le32(CNTRL_REG(p,mon_sense)) & 0x1c0) << 2;
 763
 764        /* drive each sense line low in turn and collect the other 2 */
 765        out_le32(CNTRL_REG(p,mon_sense), 033);  /* drive A low */
 766        __delay(2000);
 767        sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0xc0) >> 2;
 768        out_le32(CNTRL_REG(p,mon_sense), 055);  /* drive B low */
 769        __delay(2000);
 770        sense |= ((in_le32(CNTRL_REG(p,mon_sense)) & 0x100) >> 5)
 771                | ((in_le32(CNTRL_REG(p,mon_sense)) & 0x40) >> 4);
 772        out_le32(CNTRL_REG(p,mon_sense), 066);  /* drive C low */
 773        __delay(2000);
 774        sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0x180) >> 7;
 775
 776        out_le32(CNTRL_REG(p,mon_sense), 077);  /* turn off drivers */
 777        
 778        return sense;
 779}
 780
 781/**********************  Various translation functions  **********************/
 782
 783#define CONTROL_PIXCLOCK_BASE   256016
 784#define CONTROL_PIXCLOCK_MIN    5000    /* ~ 200 MHz dot clock */
 785
 786/*
 787 * calculate the clock paramaters to be sent to CUDA according to given
 788 * pixclock in pico second.
 789 */
 790static int calc_clock_params(unsigned long clk, unsigned char *param)
 791{
 792        unsigned long p0, p1, p2, k, l, m, n, min;
 793
 794        if (clk > (CONTROL_PIXCLOCK_BASE << 3))
 795                return 1;
 796
 797        p2 = ((clk << 4) < CONTROL_PIXCLOCK_BASE)? 3: 2;
 798        l = clk << p2;
 799        p0 = 0;
 800        p1 = 0;
 801        for (k = 1, min = l; k < 32; k++) {
 802                unsigned long rem;
 803
 804                m = CONTROL_PIXCLOCK_BASE * k;
 805                n = m / l;
 806                rem = m % l;
 807                if (n && (n < 128) && rem < min) {
 808                        p0 = k;
 809                        p1 = n;
 810                        min = rem;
 811                }
 812        }
 813        if (!p0 || !p1)
 814                return 1;
 815
 816        param[0] = p0;
 817        param[1] = p1;
 818        param[2] = p2;
 819
 820        return 0;
 821}
 822
 823
 824/*
 825 * This routine takes a user-supplied var, and picks the best vmode/cmode
 826 * from it.
 827 */
 828
 829static int control_var_to_par(struct fb_var_screeninfo *var,
 830        struct fb_par_control *par, const struct fb_info *fb_info)
 831{
 832        int cmode, piped_diff, hstep;
 833        unsigned hperiod, hssync, hsblank, hesync, heblank, piped, heq, hlfln,
 834                 hserr, vperiod, vssync, vesync, veblank, vsblank, vswin, vewin;
 835        unsigned long pixclock;
 836        struct fb_info_control *p = (struct fb_info_control *) fb_info;
 837        struct control_regvals *r = &par->regvals;
 838
 839        switch (var->bits_per_pixel) {
 840        case 8:
 841                par->cmode = CMODE_8;
 842                if (p->total_vram > 0x200000) {
 843                        r->mode = 3;
 844                        r->radacal_ctrl = 0x20;
 845                        piped_diff = 13;
 846                } else {
 847                        r->mode = 2;
 848                        r->radacal_ctrl = 0x10;
 849                        piped_diff = 9;
 850                }
 851                break;
 852        case 15:
 853        case 16:
 854                par->cmode = CMODE_16;
 855                if (p->total_vram > 0x200000) {
 856                        r->mode = 2;
 857                        r->radacal_ctrl = 0x24;
 858                        piped_diff = 5;
 859                } else {
 860                        r->mode = 1;
 861                        r->radacal_ctrl = 0x14;
 862                        piped_diff = 3;
 863                }
 864                break;
 865        case 32:
 866                par->cmode = CMODE_32;
 867                if (p->total_vram > 0x200000) {
 868                        r->mode = 1;
 869                        r->radacal_ctrl = 0x28;
 870                } else {
 871                        r->mode = 0;
 872                        r->radacal_ctrl = 0x18;
 873                }
 874                piped_diff = 1;
 875                break;
 876        default:
 877                return -EINVAL;
 878        }
 879
 880        /*
 881         * adjust xres and vxres so that the corresponding memory widths are
 882         * 32-byte aligned
 883         */
 884        hstep = 31 >> par->cmode;
 885        par->xres = (var->xres + hstep) & ~hstep;
 886        par->vxres = (var->xres_virtual + hstep) & ~hstep;
 887        par->xoffset = (var->xoffset + hstep) & ~hstep;
 888        if (par->vxres < par->xres)
 889                par->vxres = par->xres;
 890        par->pitch = par->vxres << par->cmode;
 891
 892        par->yres = var->yres;
 893        par->vyres = var->yres_virtual;
 894        par->yoffset = var->yoffset;
 895        if (par->vyres < par->yres)
 896                par->vyres = par->yres;
 897
 898        par->sync = var->sync;
 899
 900        if (par->pitch * par->vyres + CTRLFB_OFF > p->total_vram)
 901                return -EINVAL;
 902
 903        if (par->xoffset + par->xres > par->vxres)
 904                par->xoffset = par->vxres - par->xres;
 905        if (par->yoffset + par->yres > par->vyres)
 906                par->yoffset = par->vyres - par->yres;
 907
 908        pixclock = (var->pixclock < CONTROL_PIXCLOCK_MIN)? CONTROL_PIXCLOCK_MIN:
 909                   var->pixclock;
 910        if (calc_clock_params(pixclock, r->clock_params))
 911                return -EINVAL;
 912
 913        hperiod = ((var->left_margin + par->xres + var->right_margin
 914                    + var->hsync_len) >> 1) - 2;
 915        hssync = hperiod + 1;
 916        hsblank = hssync - (var->right_margin >> 1);
 917        hesync = (var->hsync_len >> 1) - 1;
 918        heblank = (var->left_margin >> 1) + hesync;
 919        piped = heblank - piped_diff;
 920        heq = var->hsync_len >> 2;
 921        hlfln = (hperiod+2) >> 1;
 922        hserr = hssync-hesync;
 923        vperiod = (var->vsync_len + var->lower_margin + par->yres
 924                   + var->upper_margin) << 1;
 925        vssync = vperiod - 2;
 926        vesync = (var->vsync_len << 1) - vperiod + vssync;
 927        veblank = (var->upper_margin << 1) + vesync;
 928        vsblank = vssync - (var->lower_margin << 1);
 929        vswin = (vsblank+vssync) >> 1;
 930        vewin = (vesync+veblank) >> 1;
 931
 932        r->regs[0] = vswin;
 933        r->regs[1] = vsblank;
 934        r->regs[2] = veblank;
 935        r->regs[3] = vewin;
 936        r->regs[4] = vesync;
 937        r->regs[5] = vssync;
 938        r->regs[6] = vperiod;
 939        r->regs[7] = piped;
 940        r->regs[8] = hperiod;
 941        r->regs[9] = hsblank;
 942        r->regs[10] = heblank;
 943        r->regs[11] = hesync;
 944        r->regs[12] = hssync;
 945        r->regs[13] = heq;
 946        r->regs[14] = hlfln;
 947        r->regs[15] = hserr;
 948
 949        if (par->xres >= 1280 && par->cmode >= CMODE_16)
 950                par->ctrl = 0x7f;
 951        else
 952                par->ctrl = 0x3b;
 953
 954        if (mac_var_to_vmode(var, &par->vmode, &cmode))
 955                par->vmode = 0;
 956
 957        return 0;
 958}
 959
 960
 961/*
 962 * Convert hardware data in par to an fb_var_screeninfo
 963 */
 964
 965static void control_par_to_var(struct fb_par_control *par, struct fb_var_screeninfo *var)
 966{
 967        struct control_regints *rv;
 968        
 969        rv = (struct control_regints *) par->regvals.regs;
 970        
 971        memset(var, 0, sizeof(*var));
 972        var->xres = par->xres;
 973        var->yres = par->yres;
 974        var->xres_virtual = par->vxres;
 975        var->yres_virtual = par->vyres;
 976        var->xoffset = par->xoffset;
 977        var->yoffset = par->yoffset;
 978        
 979        switch(par->cmode) {
 980        default:
 981        case CMODE_8:
 982                var->bits_per_pixel = 8;
 983                var->red.length = 8;
 984                var->green.length = 8;
 985                var->blue.length = 8;
 986                break;
 987        case CMODE_16:  /* RGB 555 */
 988                var->bits_per_pixel = 16;
 989                var->red.offset = 10;
 990                var->red.length = 5;
 991                var->green.offset = 5;
 992                var->green.length = 5;
 993                var->blue.length = 5;
 994                break;
 995        case CMODE_32:  /* RGB 888 */
 996                var->bits_per_pixel = 32;
 997                var->red.offset = 16;
 998                var->red.length = 8;
 999                var->green.offset = 8;
1000                var->green.length = 8;
1001                var->blue.length = 8;
1002                var->transp.offset = 24;
1003                var->transp.length = 8;
1004                break;
1005        }
1006        var->height = -1;
1007        var->width = -1;
1008        var->vmode = FB_VMODE_NONINTERLACED;
1009
1010        var->left_margin = (rv->heblank - rv->hesync) << 1;
1011        var->right_margin = (rv->hssync - rv->hsblank) << 1;
1012        var->hsync_len = (rv->hperiod + 2 - rv->hssync + rv->hesync) << 1;
1013
1014        var->upper_margin = (rv->veblank - rv->vesync) >> 1;
1015        var->lower_margin = (rv->vssync - rv->vsblank) >> 1;
1016        var->vsync_len = (rv->vperiod - rv->vssync + rv->vesync) >> 1;
1017
1018        var->sync = par->sync;
1019
1020        /*
1021         * 10^12 * clock_params[0] / (3906400 * clock_params[1]
1022         *                            * 2^clock_params[2])
1023         * (10^12 * clock_params[0] / (3906400 * clock_params[1]))
1024         * >> clock_params[2]
1025         */
1026        /* (255990.17 * clock_params[0] / clock_params[1]) >> clock_params[2] */
1027        var->pixclock = CONTROL_PIXCLOCK_BASE * par->regvals.clock_params[0];
1028        var->pixclock /= par->regvals.clock_params[1];
1029        var->pixclock >>= par->regvals.clock_params[2];
1030}
1031
1032/*
1033 * Set misc info vars for this driver
1034 */
1035static void __init control_init_info(struct fb_info *info, struct fb_info_control *p)
1036{
1037        /* Fill fb_info */
1038        info->par = &p->par;
1039        info->fbops = &controlfb_ops;
1040        info->pseudo_palette = p->pseudo_palette;
1041        info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
1042        info->screen_base = p->frame_buffer + CTRLFB_OFF;
1043
1044        fb_alloc_cmap(&info->cmap, 256, 0);
1045
1046        /* Fill fix common fields */
1047        strcpy(info->fix.id, "control");
1048        info->fix.mmio_start = p->control_regs_phys;
1049        info->fix.mmio_len = sizeof(struct control_regs);
1050        info->fix.type = FB_TYPE_PACKED_PIXELS;
1051        info->fix.smem_start = p->frame_buffer_phys + CTRLFB_OFF;
1052        info->fix.smem_len = p->total_vram - CTRLFB_OFF;
1053        info->fix.ywrapstep = 0;
1054        info->fix.type_aux = 0;
1055        info->fix.accel = FB_ACCEL_NONE;
1056}
1057
1058
1059static void control_cleanup(void)
1060{
1061        struct fb_info_control  *p = control_fb;
1062
1063        if (!p)
1064                return;
1065
1066        if (p->cmap_regs)
1067                iounmap(p->cmap_regs);
1068        if (p->control_regs)
1069                iounmap(p->control_regs);
1070        if (p->frame_buffer) {
1071                if (p->control_use_bank2)
1072                        p->frame_buffer -= 0x600000;
1073                iounmap(p->frame_buffer);
1074        }
1075        if (p->cmap_regs_phys)
1076                release_mem_region(p->cmap_regs_phys, 0x1000);
1077        if (p->control_regs_phys)
1078                release_mem_region(p->control_regs_phys, p->control_regs_size);
1079        if (p->fb_orig_base)
1080                release_mem_region(p->fb_orig_base, p->fb_orig_size);
1081        kfree(p);
1082}
1083
1084
1085
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