drivers/video/fbdev/controlfb.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
PAR_EQUAL
VAR_MATCH
init_module
cleanup_module
controlfb_check_var
controlfb_set_par
set_screen_start
controlfb_pan_display
controlfb_mmap
controlfb_blank
controlfb_setcolreg
set_control_clock
init_control
control_set_hardware
control_setup
control_init
find_vram_size
control_of_init
read_control_sense
calc_clock_params
control_var_to_par
control_par_to_var
control_init_info
control_cleanup
   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/prom.h>
  52 #include <asm/btext.h>
  53 
  54 #include "macmodes.h"
  55 #include "controlfb.h"
  56 
  57 struct 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)))
  70 static 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 }
  86 static 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 
  94 struct 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  */
 124 static int controlfb_pan_display(struct fb_var_screeninfo *var,
 125         struct fb_info *info);
 126 static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 127         u_int transp, struct fb_info *info);
 128 static int controlfb_blank(int blank_mode, struct fb_info *info);
 129 static int controlfb_mmap(struct fb_info *info,
 130         struct vm_area_struct *vma);
 131 static int controlfb_set_par (struct fb_info *info);
 132 static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info);
 133 
 134 /******************** Prototypes for internal functions **********************/
 135 
 136 static void set_control_clock(unsigned char *params);
 137 static int init_control(struct fb_info_control *p);
 138 static void control_set_hardware(struct fb_info_control *p,
 139         struct fb_par_control *par);
 140 static int control_of_init(struct device_node *dp);
 141 static void find_vram_size(struct fb_info_control *p);
 142 static int read_control_sense(struct fb_info_control *p);
 143 static int calc_clock_params(unsigned long clk, unsigned char *param);
 144 static int control_var_to_par(struct fb_var_screeninfo *var,
 145         struct fb_par_control *par, const struct fb_info *fb_info);
 146 static inline void control_par_to_var(struct fb_par_control *par,
 147         struct fb_var_screeninfo *var);
 148 static void control_init_info(struct fb_info *info, struct fb_info_control *p);
 149 static void control_cleanup(void);
 150 
 151 
 152 /************************** Internal variables *******************************/
 153 
 154 static struct fb_info_control *control_fb;
 155 
 156 static int default_vmode __initdata = VMODE_NVRAM;
 157 static int default_cmode __initdata = CMODE_NVRAM;
 158 
 159 
 160 static 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
 177 MODULE_LICENSE("GPL");
 178 
 179 int 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 && !control_of_init(dp))
 186                 ret = 0;
 187         of_node_put(dp);
 188 
 189         return ret;
 190 }
 191 
 192 void cleanup_module(void)
 193 {
 194         control_cleanup();
 195 }
 196 #endif
 197 
 198 /*
 199  * Checks a var structure
 200  */
 201 static 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  */
 217 static int controlfb_set_par (struct fb_info *info)
 218 {
 219         struct fb_info_control *p =
 220                 container_of(info, struct fb_info_control, info);
 221         struct fb_par_control par;
 222         int err;
 223 
 224         if((err = control_var_to_par(&info->var, &par, info))) {
 225                 printk (KERN_ERR "controlfb_set_par: error calling"
 226                                  " control_var_to_par: %d.\n", err);
 227                 return err;
 228         }
 229         
 230         control_set_hardware(p, &par);
 231 
 232         info->fix.visual = (p->par.cmode == CMODE_8) ?
 233                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
 234         info->fix.line_length = p->par.pitch;
 235         info->fix.xpanstep = 32 >> p->par.cmode;
 236         info->fix.ypanstep = 1;
 237 
 238         return 0;
 239 }
 240 
 241 /*
 242  * Set screen start address according to var offset values
 243  */
 244 static inline void set_screen_start(int xoffset, int yoffset,
 245         struct fb_info_control *p)
 246 {
 247         struct fb_par_control *par = &p->par;
 248 
 249         par->xoffset = xoffset;
 250         par->yoffset = yoffset;
 251         out_le32(CNTRL_REG(p,start_addr),
 252                  par->yoffset * par->pitch + (par->xoffset << par->cmode));
 253 }
 254 
 255 
 256 static int controlfb_pan_display(struct fb_var_screeninfo *var,
 257                                  struct fb_info *info)
 258 {
 259         unsigned int xoffset, hstep;
 260         struct fb_info_control *p =
 261                 container_of(info, 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  */
 285 static 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 
 310 static int controlfb_blank(int blank_mode, struct fb_info *info)
 311 {
 312         struct fb_info_control *p =
 313                 container_of(info, struct fb_info_control, info);
 314         unsigned ctrl;
 315 
 316         ctrl = le32_to_cpup(CNTRL_REG(p,ctrl));
 317         if (blank_mode > 0)
 318                 switch (blank_mode) {
 319                 case FB_BLANK_VSYNC_SUSPEND:
 320                         ctrl &= ~3;
 321                         break;
 322                 case FB_BLANK_HSYNC_SUSPEND:
 323                         ctrl &= ~0x30;
 324                         break;
 325                 case FB_BLANK_POWERDOWN:
 326                         ctrl &= ~0x33;
 327                         /* fall through */
 328                 case FB_BLANK_NORMAL:
 329                         ctrl |= 0x400;
 330                         break;
 331                 default:
 332                         break;
 333                 }
 334         else {
 335                 ctrl &= ~0x400;
 336                 ctrl |= 0x33;
 337         }
 338         out_le32(CNTRL_REG(p,ctrl), ctrl);
 339 
 340         return 0;
 341 }
 342 
 343 static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 344                              u_int transp, struct fb_info *info)
 345 {
 346         struct fb_info_control *p =
 347                 container_of(info, struct fb_info_control, info);
 348         __u8 r, g, b;
 349 
 350         if (regno > 255)
 351                 return 1;
 352 
 353         r = red >> 8;
 354         g = green >> 8;
 355         b = blue >> 8;
 356 
 357         out_8(&p->cmap_regs->addr, regno);      /* tell clut what addr to fill  */
 358         out_8(&p->cmap_regs->lut, r);           /* send one color channel at    */
 359         out_8(&p->cmap_regs->lut, g);           /* a time...                    */
 360         out_8(&p->cmap_regs->lut, b);
 361 
 362         if (regno < 16) {
 363                 int i;
 364                 switch (p->par.cmode) {
 365                 case CMODE_16:
 366                         p->pseudo_palette[regno] =
 367                             (regno << 10) | (regno << 5) | regno;
 368                         break;
 369                 case CMODE_32:
 370                         i = (regno << 8) | regno;
 371                         p->pseudo_palette[regno] = (i << 16) | i;
 372                         break;
 373                 }
 374         }
 375 
 376         return 0;
 377 }
 378 
 379 
 380 /********************  End of controlfb_ops implementation  ******************/
 381 
 382 
 383 
 384 static void set_control_clock(unsigned char *params)
 385 {
 386 #ifdef CONFIG_ADB_CUDA
 387         struct adb_request req;
 388         int i;
 389 
 390         for (i = 0; i < 3; ++i) {
 391                 cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
 392                              0x50, i + 1, params[i]);
 393                 while (!req.complete)
 394                         cuda_poll();
 395         }
 396 #endif  
 397 }
 398 
 399 
 400 /*
 401  * finish off the driver initialization and register
 402  */
 403 static int __init init_control(struct fb_info_control *p)
 404 {
 405         int full, sense, vmode, cmode, vyres;
 406         struct fb_var_screeninfo var;
 407         int rc;
 408         
 409         printk(KERN_INFO "controlfb: ");
 410 
 411         full = p->total_vram == 0x400000;
 412 
 413         /* Try to pick a video mode out of NVRAM if we have one. */
 414         cmode = default_cmode;
 415         if (IS_REACHABLE(CONFIG_NVRAM) && cmode == CMODE_NVRAM)
 416                 cmode = nvram_read_byte(NV_CMODE);
 417         if (cmode < CMODE_8 || cmode > CMODE_32)
 418                 cmode = CMODE_8;
 419 
 420         vmode = default_vmode;
 421         if (IS_REACHABLE(CONFIG_NVRAM) && 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(KERN_CONT "Monitor sense value = 0x%x, ", sense);
 427                 vmode = mac_map_monitor_sense(sense);
 428                 if (control_mac_modes[vmode - 1].m[full] < 0)
 429                         vmode = VMODE_640_480_60;
 430                 cmode = min(cmode, control_mac_modes[vmode - 1].m[full]);
 431         }
 432 
 433         /* Initialize info structure */
 434         control_init_info(&p->info, p);
 435 
 436         /* Setup default var */
 437         if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
 438                 /* This shouldn't happen! */
 439                 printk("mac_vmode_to_var(%d, %d,) failed\n", vmode, cmode);
 440 try_again:
 441                 vmode = VMODE_640_480_60;
 442                 cmode = CMODE_8;
 443                 if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
 444                         printk(KERN_ERR "controlfb: mac_vmode_to_var() failed\n");
 445                         return -ENXIO;
 446                 }
 447                 printk(KERN_INFO "controlfb: ");
 448         }
 449         printk("using video mode %d and color mode %d.\n", vmode, cmode);
 450 
 451         vyres = (p->total_vram - CTRLFB_OFF) / (var.xres << cmode);
 452         if (vyres > var.yres)
 453                 var.yres_virtual = vyres;
 454 
 455         /* Apply default var */
 456         var.activate = FB_ACTIVATE_NOW;
 457         rc = fb_set_var(&p->info, &var);
 458         if (rc && (vmode != VMODE_640_480_60 || cmode != CMODE_8))
 459                 goto try_again;
 460 
 461         /* Register with fbdev layer */
 462         if (register_framebuffer(&p->info) < 0)
 463                 return -ENXIO;
 464 
 465         fb_info(&p->info, "control display adapter\n");
 466 
 467         return 0;
 468 }
 469 
 470 #define RADACAL_WRITE(a,d) \
 471         out_8(&p->cmap_regs->addr, (a)); \
 472         out_8(&p->cmap_regs->dat,   (d))
 473 
 474 /* Now how about actually saying, Make it so! */
 475 /* Some things in here probably don't need to be done each time. */
 476 static void control_set_hardware(struct fb_info_control *p, struct fb_par_control *par)
 477 {
 478         struct control_regvals  *r;
 479         volatile struct preg    __iomem *rp;
 480         int                     i, cmode;
 481 
 482         if (PAR_EQUAL(&p->par, par)) {
 483                 /*
 484                  * check if only xoffset or yoffset differs.
 485                  * this prevents flickers in typical VT switch case.
 486                  */
 487                 if (p->par.xoffset != par->xoffset ||
 488                     p->par.yoffset != par->yoffset)
 489                         set_screen_start(par->xoffset, par->yoffset, p);
 490                         
 491                 return;
 492         }
 493         
 494         p->par = *par;
 495         cmode = p->par.cmode;
 496         r = &par->regvals;
 497         
 498         /* Turn off display */
 499         out_le32(CNTRL_REG(p,ctrl), 0x400 | par->ctrl);
 500         
 501         set_control_clock(r->clock_params);
 502         
 503         RADACAL_WRITE(0x20, r->radacal_ctrl);
 504         RADACAL_WRITE(0x21, p->control_use_bank2 ? 0 : 1);
 505         RADACAL_WRITE(0x10, 0);
 506         RADACAL_WRITE(0x11, 0);
 507 
 508         rp = &p->control_regs->vswin;
 509         for (i = 0; i < 16; ++i, ++rp)
 510                 out_le32(&rp->r, r->regs[i]);
 511         
 512         out_le32(CNTRL_REG(p,pitch), par->pitch);
 513         out_le32(CNTRL_REG(p,mode), r->mode);
 514         out_le32(CNTRL_REG(p,vram_attr), p->vram_attr);
 515         out_le32(CNTRL_REG(p,start_addr), par->yoffset * par->pitch
 516                  + (par->xoffset << cmode));
 517         out_le32(CNTRL_REG(p,rfrcnt), 0x1e5);
 518         out_le32(CNTRL_REG(p,intr_ena), 0);
 519 
 520         /* Turn on display */
 521         out_le32(CNTRL_REG(p,ctrl), par->ctrl);
 522 
 523 #ifdef CONFIG_BOOTX_TEXT
 524         btext_update_display(p->frame_buffer_phys + CTRLFB_OFF,
 525                              p->par.xres, p->par.yres,
 526                              (cmode == CMODE_32? 32: cmode == CMODE_16? 16: 8),
 527                              p->par.pitch);
 528 #endif /* CONFIG_BOOTX_TEXT */
 529 }
 530 
 531 
 532 /*
 533  * Parse user specified options (`video=controlfb:')
 534  */
 535 static void __init control_setup(char *options)
 536 {
 537         char *this_opt;
 538 
 539         if (!options || !*options)
 540                 return;
 541 
 542         while ((this_opt = strsep(&options, ",")) != NULL) {
 543                 if (!strncmp(this_opt, "vmode:", 6)) {
 544                         int vmode = simple_strtoul(this_opt+6, NULL, 0);
 545                         if (vmode > 0 && vmode <= VMODE_MAX &&
 546                             control_mac_modes[vmode - 1].m[1] >= 0)
 547                                 default_vmode = vmode;
 548                 } else if (!strncmp(this_opt, "cmode:", 6)) {
 549                         int depth = simple_strtoul(this_opt+6, NULL, 0);
 550                         switch (depth) {
 551                          case CMODE_8:
 552                          case CMODE_16:
 553                          case CMODE_32:
 554                                 default_cmode = depth;
 555                                 break;
 556                          case 8:
 557                                 default_cmode = CMODE_8;
 558                                 break;
 559                          case 15:
 560                          case 16:
 561                                 default_cmode = CMODE_16;
 562                                 break;
 563                          case 24:
 564                          case 32:
 565                                 default_cmode = CMODE_32;
 566                                 break;
 567                         }
 568                 }
 569         }
 570 }
 571 
 572 static int __init control_init(void)
 573 {
 574         struct device_node *dp;
 575         char *option = NULL;
 576         int ret = -ENXIO;
 577 
 578         if (fb_get_options("controlfb", &option))
 579                 return -ENODEV;
 580         control_setup(option);
 581 
 582         dp = of_find_node_by_name(NULL, "control");
 583         if (dp && !control_of_init(dp))
 584                 ret = 0;
 585         of_node_put(dp);
 586 
 587         return ret;
 588 }
 589 
 590 module_init(control_init);
 591 
 592 /* Work out which banks of VRAM we have installed. */
 593 /* danj: I guess the card just ignores writes to nonexistant VRAM... */
 594 
 595 static void __init find_vram_size(struct fb_info_control *p)
 596 {
 597         int bank1, bank2;
 598 
 599         /*
 600          * Set VRAM in 2MB (bank 1) mode
 601          * VRAM Bank 2 will be accessible through offset 0x600000 if present
 602          * and VRAM Bank 1 will not respond at that offset even if present
 603          */
 604         out_le32(CNTRL_REG(p,vram_attr), 0x31);
 605 
 606         out_8(&p->frame_buffer[0x600000], 0xb3);
 607         out_8(&p->frame_buffer[0x600001], 0x71);
 608         asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0x600000])
 609                                         : "memory" );
 610         mb();
 611         asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0x600000])
 612                                         : "memory" );
 613         mb();
 614 
 615         bank2 = (in_8(&p->frame_buffer[0x600000]) == 0xb3)
 616                 && (in_8(&p->frame_buffer[0x600001]) == 0x71);
 617 
 618         /*
 619          * Set VRAM in 2MB (bank 2) mode
 620          * VRAM Bank 1 will be accessible through offset 0x000000 if present
 621          * and VRAM Bank 2 will not respond at that offset even if present
 622          */
 623         out_le32(CNTRL_REG(p,vram_attr), 0x39);
 624 
 625         out_8(&p->frame_buffer[0], 0x5a);
 626         out_8(&p->frame_buffer[1], 0xc7);
 627         asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0])
 628                                         : "memory" );
 629         mb();
 630         asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0])
 631                                         : "memory" );
 632         mb();
 633 
 634         bank1 = (in_8(&p->frame_buffer[0]) == 0x5a)
 635                 && (in_8(&p->frame_buffer[1]) == 0xc7);
 636 
 637         if (bank2) {
 638                 if (!bank1) {
 639                         /*
 640                          * vram bank 2 only
 641                          */
 642                         p->control_use_bank2 = 1;
 643                         p->vram_attr = 0x39;
 644                         p->frame_buffer += 0x600000;
 645                         p->frame_buffer_phys += 0x600000;
 646                 } else {
 647                         /*
 648                          * 4 MB vram
 649                          */
 650                         p->vram_attr = 0x51;
 651                 }
 652         } else {
 653                 /*
 654                  * vram bank 1 only
 655                  */
 656                 p->vram_attr = 0x31;
 657         }
 658 
 659         p->total_vram = (bank1 + bank2) * 0x200000;
 660 
 661         printk(KERN_INFO "controlfb: VRAM Total = %dMB "
 662                         "(%dMB @ bank 1, %dMB @ bank 2)\n",
 663                         (bank1 + bank2) << 1, bank1 << 1, bank2 << 1);
 664 }
 665 
 666 
 667 /*
 668  * find "control" and initialize
 669  */
 670 static int __init control_of_init(struct device_node *dp)
 671 {
 672         struct fb_info_control  *p;
 673         struct resource         fb_res, reg_res;
 674 
 675         if (control_fb) {
 676                 printk(KERN_ERR "controlfb: only one control is supported\n");
 677                 return -ENXIO;
 678         }
 679 
 680         if (of_pci_address_to_resource(dp, 2, &fb_res) ||
 681             of_pci_address_to_resource(dp, 1, &reg_res)) {
 682                 printk(KERN_ERR "can't get 2 addresses for control\n");
 683                 return -ENXIO;
 684         }
 685         p = kzalloc(sizeof(*p), GFP_KERNEL);
 686         if (!p)
 687                 return -ENOMEM;
 688         control_fb = p; /* save it for cleanups */
 689 
 690         /* Map in frame buffer and registers */
 691         p->fb_orig_base = fb_res.start;
 692         p->fb_orig_size = resource_size(&fb_res);
 693         /* use the big-endian aperture (??) */
 694         p->frame_buffer_phys = fb_res.start + 0x800000;
 695         p->control_regs_phys = reg_res.start;
 696         p->control_regs_size = resource_size(&reg_res);
 697 
 698         if (!p->fb_orig_base ||
 699             !request_mem_region(p->fb_orig_base,p->fb_orig_size,"controlfb")) {
 700                 p->fb_orig_base = 0;
 701                 goto error_out;
 702         }
 703         /* map at most 8MB for the frame buffer */
 704         p->frame_buffer = ioremap_wt(p->frame_buffer_phys, 0x800000);
 705 
 706         if (!p->control_regs_phys ||
 707             !request_mem_region(p->control_regs_phys, p->control_regs_size,
 708             "controlfb regs")) {
 709                 p->control_regs_phys = 0;
 710                 goto error_out;
 711         }
 712         p->control_regs = ioremap(p->control_regs_phys, p->control_regs_size);
 713 
 714         p->cmap_regs_phys = 0xf301b000;  /* XXX not in prom? */
 715         if (!request_mem_region(p->cmap_regs_phys, 0x1000, "controlfb cmap")) {
 716                 p->cmap_regs_phys = 0;
 717                 goto error_out;
 718         }
 719         p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
 720 
 721         if (!p->cmap_regs || !p->control_regs || !p->frame_buffer)
 722                 goto error_out;
 723 
 724         find_vram_size(p);
 725         if (!p->total_vram)
 726                 goto error_out;
 727 
 728         if (init_control(p) < 0)
 729                 goto error_out;
 730 
 731         return 0;
 732 
 733 error_out:
 734         control_cleanup();
 735         return -ENXIO;
 736 }
 737 
 738 /*
 739  * Get the monitor sense value.
 740  * Note that this can be called before calibrate_delay,
 741  * so we can't use udelay.
 742  */
 743 static int read_control_sense(struct fb_info_control *p)
 744 {
 745         int sense;
 746 
 747         out_le32(CNTRL_REG(p,mon_sense), 7);    /* drive all lines high */
 748         __delay(200);
 749         out_le32(CNTRL_REG(p,mon_sense), 077);  /* turn off drivers */
 750         __delay(2000);
 751         sense = (in_le32(CNTRL_REG(p,mon_sense)) & 0x1c0) << 2;
 752 
 753         /* drive each sense line low in turn and collect the other 2 */
 754         out_le32(CNTRL_REG(p,mon_sense), 033);  /* drive A low */
 755         __delay(2000);
 756         sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0xc0) >> 2;
 757         out_le32(CNTRL_REG(p,mon_sense), 055);  /* drive B low */
 758         __delay(2000);
 759         sense |= ((in_le32(CNTRL_REG(p,mon_sense)) & 0x100) >> 5)
 760                 | ((in_le32(CNTRL_REG(p,mon_sense)) & 0x40) >> 4);
 761         out_le32(CNTRL_REG(p,mon_sense), 066);  /* drive C low */
 762         __delay(2000);
 763         sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0x180) >> 7;
 764 
 765         out_le32(CNTRL_REG(p,mon_sense), 077);  /* turn off drivers */
 766         
 767         return sense;
 768 }
 769 
 770 /**********************  Various translation functions  **********************/
 771 
 772 #define CONTROL_PIXCLOCK_BASE   256016
 773 #define CONTROL_PIXCLOCK_MIN    5000    /* ~ 200 MHz dot clock */
 774 
 775 /*
 776  * calculate the clock paramaters to be sent to CUDA according to given
 777  * pixclock in pico second.
 778  */
 779 static int calc_clock_params(unsigned long clk, unsigned char *param)
 780 {
 781         unsigned long p0, p1, p2, k, l, m, n, min;
 782 
 783         if (clk > (CONTROL_PIXCLOCK_BASE << 3))
 784                 return 1;
 785 
 786         p2 = ((clk << 4) < CONTROL_PIXCLOCK_BASE)? 3: 2;
 787         l = clk << p2;
 788         p0 = 0;
 789         p1 = 0;
 790         for (k = 1, min = l; k < 32; k++) {
 791                 unsigned long rem;
 792 
 793                 m = CONTROL_PIXCLOCK_BASE * k;
 794                 n = m / l;
 795                 rem = m % l;
 796                 if (n && (n < 128) && rem < min) {
 797                         p0 = k;
 798                         p1 = n;
 799                         min = rem;
 800                 }
 801         }
 802         if (!p0 || !p1)
 803                 return 1;
 804 
 805         param[0] = p0;
 806         param[1] = p1;
 807         param[2] = p2;
 808 
 809         return 0;
 810 }
 811 
 812 
 813 /*
 814  * This routine takes a user-supplied var, and picks the best vmode/cmode
 815  * from it.
 816  */
 817 
 818 static int control_var_to_par(struct fb_var_screeninfo *var,
 819         struct fb_par_control *par, const struct fb_info *fb_info)
 820 {
 821         int cmode, piped_diff, hstep;
 822         unsigned hperiod, hssync, hsblank, hesync, heblank, piped, heq, hlfln,
 823                  hserr, vperiod, vssync, vesync, veblank, vsblank, vswin, vewin;
 824         unsigned long pixclock;
 825         struct fb_info_control *p =
 826                 container_of(fb_info, struct fb_info_control, info);
 827         struct control_regvals *r = &par->regvals;
 828 
 829         switch (var->bits_per_pixel) {
 830         case 8:
 831                 par->cmode = CMODE_8;
 832                 if (p->total_vram > 0x200000) {
 833                         r->mode = 3;
 834                         r->radacal_ctrl = 0x20;
 835                         piped_diff = 13;
 836                 } else {
 837                         r->mode = 2;
 838                         r->radacal_ctrl = 0x10;
 839                         piped_diff = 9;
 840                 }
 841                 break;
 842         case 15:
 843         case 16:
 844                 par->cmode = CMODE_16;
 845                 if (p->total_vram > 0x200000) {
 846                         r->mode = 2;
 847                         r->radacal_ctrl = 0x24;
 848                         piped_diff = 5;
 849                 } else {
 850                         r->mode = 1;
 851                         r->radacal_ctrl = 0x14;
 852                         piped_diff = 3;
 853                 }
 854                 break;
 855         case 32:
 856                 par->cmode = CMODE_32;
 857                 if (p->total_vram > 0x200000) {
 858                         r->mode = 1;
 859                         r->radacal_ctrl = 0x28;
 860                 } else {
 861                         r->mode = 0;
 862                         r->radacal_ctrl = 0x18;
 863                 }
 864                 piped_diff = 1;
 865                 break;
 866         default:
 867                 return -EINVAL;
 868         }
 869 
 870         /*
 871          * adjust xres and vxres so that the corresponding memory widths are
 872          * 32-byte aligned
 873          */
 874         hstep = 31 >> par->cmode;
 875         par->xres = (var->xres + hstep) & ~hstep;
 876         par->vxres = (var->xres_virtual + hstep) & ~hstep;
 877         par->xoffset = (var->xoffset + hstep) & ~hstep;
 878         if (par->vxres < par->xres)
 879                 par->vxres = par->xres;
 880         par->pitch = par->vxres << par->cmode;
 881 
 882         par->yres = var->yres;
 883         par->vyres = var->yres_virtual;
 884         par->yoffset = var->yoffset;
 885         if (par->vyres < par->yres)
 886                 par->vyres = par->yres;
 887 
 888         par->sync = var->sync;
 889 
 890         if (par->pitch * par->vyres + CTRLFB_OFF > p->total_vram)
 891                 return -EINVAL;
 892 
 893         if (par->xoffset + par->xres > par->vxres)
 894                 par->xoffset = par->vxres - par->xres;
 895         if (par->yoffset + par->yres > par->vyres)
 896                 par->yoffset = par->vyres - par->yres;
 897 
 898         pixclock = (var->pixclock < CONTROL_PIXCLOCK_MIN)? CONTROL_PIXCLOCK_MIN:
 899                    var->pixclock;
 900         if (calc_clock_params(pixclock, r->clock_params))
 901                 return -EINVAL;
 902 
 903         hperiod = ((var->left_margin + par->xres + var->right_margin
 904                     + var->hsync_len) >> 1) - 2;
 905         hssync = hperiod + 1;
 906         hsblank = hssync - (var->right_margin >> 1);
 907         hesync = (var->hsync_len >> 1) - 1;
 908         heblank = (var->left_margin >> 1) + hesync;
 909         piped = heblank - piped_diff;
 910         heq = var->hsync_len >> 2;
 911         hlfln = (hperiod+2) >> 1;
 912         hserr = hssync-hesync;
 913         vperiod = (var->vsync_len + var->lower_margin + par->yres
 914                    + var->upper_margin) << 1;
 915         vssync = vperiod - 2;
 916         vesync = (var->vsync_len << 1) - vperiod + vssync;
 917         veblank = (var->upper_margin << 1) + vesync;
 918         vsblank = vssync - (var->lower_margin << 1);
 919         vswin = (vsblank+vssync) >> 1;
 920         vewin = (vesync+veblank) >> 1;
 921 
 922         r->regs[0] = vswin;
 923         r->regs[1] = vsblank;
 924         r->regs[2] = veblank;
 925         r->regs[3] = vewin;
 926         r->regs[4] = vesync;
 927         r->regs[5] = vssync;
 928         r->regs[6] = vperiod;
 929         r->regs[7] = piped;
 930         r->regs[8] = hperiod;
 931         r->regs[9] = hsblank;
 932         r->regs[10] = heblank;
 933         r->regs[11] = hesync;
 934         r->regs[12] = hssync;
 935         r->regs[13] = heq;
 936         r->regs[14] = hlfln;
 937         r->regs[15] = hserr;
 938 
 939         if (par->xres >= 1280 && par->cmode >= CMODE_16)
 940                 par->ctrl = 0x7f;
 941         else
 942                 par->ctrl = 0x3b;
 943 
 944         if (mac_var_to_vmode(var, &par->vmode, &cmode))
 945                 par->vmode = 0;
 946 
 947         return 0;
 948 }
 949 
 950 
 951 /*
 952  * Convert hardware data in par to an fb_var_screeninfo
 953  */
 954 
 955 static void control_par_to_var(struct fb_par_control *par, struct fb_var_screeninfo *var)
 956 {
 957         struct control_regints *rv;
 958         
 959         rv = (struct control_regints *) par->regvals.regs;
 960         
 961         memset(var, 0, sizeof(*var));
 962         var->xres = par->xres;
 963         var->yres = par->yres;
 964         var->xres_virtual = par->vxres;
 965         var->yres_virtual = par->vyres;
 966         var->xoffset = par->xoffset;
 967         var->yoffset = par->yoffset;
 968         
 969         switch(par->cmode) {
 970         default:
 971         case CMODE_8:
 972                 var->bits_per_pixel = 8;
 973                 var->red.length = 8;
 974                 var->green.length = 8;
 975                 var->blue.length = 8;
 976                 break;
 977         case CMODE_16:  /* RGB 555 */
 978                 var->bits_per_pixel = 16;
 979                 var->red.offset = 10;
 980                 var->red.length = 5;
 981                 var->green.offset = 5;
 982                 var->green.length = 5;
 983                 var->blue.length = 5;
 984                 break;
 985         case CMODE_32:  /* RGB 888 */
 986                 var->bits_per_pixel = 32;
 987                 var->red.offset = 16;
 988                 var->red.length = 8;
 989                 var->green.offset = 8;
 990                 var->green.length = 8;
 991                 var->blue.length = 8;
 992                 var->transp.offset = 24;
 993                 var->transp.length = 8;
 994                 break;
 995         }
 996         var->height = -1;
 997         var->width = -1;
 998         var->vmode = FB_VMODE_NONINTERLACED;
 999 
1000         var->left_margin = (rv->heblank - rv->hesync) << 1;
1001         var->right_margin = (rv->hssync - rv->hsblank) << 1;
1002         var->hsync_len = (rv->hperiod + 2 - rv->hssync + rv->hesync) << 1;
1003 
1004         var->upper_margin = (rv->veblank - rv->vesync) >> 1;
1005         var->lower_margin = (rv->vssync - rv->vsblank) >> 1;
1006         var->vsync_len = (rv->vperiod - rv->vssync + rv->vesync) >> 1;
1007 
1008         var->sync = par->sync;
1009 
1010         /*
1011          * 10^12 * clock_params[0] / (3906400 * clock_params[1]
1012          *                            * 2^clock_params[2])
1013          * (10^12 * clock_params[0] / (3906400 * clock_params[1]))
1014          * >> clock_params[2]
1015          */
1016         /* (255990.17 * clock_params[0] / clock_params[1]) >> clock_params[2] */
1017         var->pixclock = CONTROL_PIXCLOCK_BASE * par->regvals.clock_params[0];
1018         var->pixclock /= par->regvals.clock_params[1];
1019         var->pixclock >>= par->regvals.clock_params[2];
1020 }
1021 
1022 /*
1023  * Set misc info vars for this driver
1024  */
1025 static void __init control_init_info(struct fb_info *info, struct fb_info_control *p)
1026 {
1027         /* Fill fb_info */
1028         info->par = &p->par;
1029         info->fbops = &controlfb_ops;
1030         info->pseudo_palette = p->pseudo_palette;
1031         info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
1032         info->screen_base = p->frame_buffer + CTRLFB_OFF;
1033 
1034         fb_alloc_cmap(&info->cmap, 256, 0);
1035 
1036         /* Fill fix common fields */
1037         strcpy(info->fix.id, "control");
1038         info->fix.mmio_start = p->control_regs_phys;
1039         info->fix.mmio_len = sizeof(struct control_regs);
1040         info->fix.type = FB_TYPE_PACKED_PIXELS;
1041         info->fix.smem_start = p->frame_buffer_phys + CTRLFB_OFF;
1042         info->fix.smem_len = p->total_vram - CTRLFB_OFF;
1043         info->fix.ywrapstep = 0;
1044         info->fix.type_aux = 0;
1045         info->fix.accel = FB_ACCEL_NONE;
1046 }
1047 
1048 
1049 static void control_cleanup(void)
1050 {
1051         struct fb_info_control  *p = control_fb;
1052 
1053         if (!p)
1054                 return;
1055 
1056         if (p->cmap_regs)
1057                 iounmap(p->cmap_regs);
1058         if (p->control_regs)
1059                 iounmap(p->control_regs);
1060         if (p->frame_buffer) {
1061                 if (p->control_use_bank2)
1062                         p->frame_buffer -= 0x600000;
1063                 iounmap(p->frame_buffer);
1064         }
1065         if (p->cmap_regs_phys)
1066                 release_mem_region(p->cmap_regs_phys, 0x1000);
1067         if (p->control_regs_phys)
1068                 release_mem_region(p->control_regs_phys, p->control_regs_size);
1069         if (p->fb_orig_base)
1070                 release_mem_region(p->fb_orig_base, p->fb_orig_size);
1071         kfree(p);
1072 }
1073 
1074
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/video/fbdev/controlfb.c

DEFINITIONS
