drivers/video/cg14.c

   1 /* cg14.c: CGFOURTEEN frame buffer driver
   2  *
   3  * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
   4  * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz)
   5  * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
   6  *
   7  * Driver layout based loosely on tgafb.c, see that file for credits.
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/errno.h>
  13 #include <linux/string.h>
  14 #include <linux/slab.h>
  15 #include <linux/delay.h>
  16 #include <linux/init.h>
  17 #include <linux/fb.h>
  18 #include <linux/mm.h>
  19
  20 #include <asm/io.h>
  21 #include <asm/prom.h>
  22 #include <asm/of_device.h>
  23 #include <asm/fbio.h>
  24
  25 #include "sbuslib.h"
  26
  27 /*
  28  * Local functions.
  29  */
  30
  31 static int cg14_setcolreg(unsigned, unsigned, unsigned, unsigned,
  32                          unsigned, struct fb_info *);
  33
  34 static int cg14_mmap(struct fb_info *, struct vm_area_struct *);
  35 static int cg14_ioctl(struct fb_info *, unsigned int, unsigned long);
  36 static int cg14_pan_display(struct fb_var_screeninfo *, struct fb_info *);
  37
  38 /*
  39  *  Frame buffer operations
  40  */
  41
  42 static struct fb_ops cg14_ops = {
  43         .owner                  = THIS_MODULE,
  44         .fb_setcolreg           = cg14_setcolreg,
  45         .fb_pan_display         = cg14_pan_display,
  46         .fb_fillrect            = cfb_fillrect,
  47         .fb_copyarea            = cfb_copyarea,
  48         .fb_imageblit           = cfb_imageblit,
  49         .fb_mmap                = cg14_mmap,
  50         .fb_ioctl               = cg14_ioctl,
  51 #ifdef CONFIG_COMPAT
  52         .fb_compat_ioctl        = sbusfb_compat_ioctl,
  53 #endif
  54 };
  55
  56 #define CG14_MCR_INTENABLE_SHIFT        7
  57 #define CG14_MCR_INTENABLE_MASK         0x80
  58 #define CG14_MCR_VIDENABLE_SHIFT        6
  59 #define CG14_MCR_VIDENABLE_MASK         0x40
  60 #define CG14_MCR_PIXMODE_SHIFT          4
  61 #define CG14_MCR_PIXMODE_MASK           0x30
  62 #define CG14_MCR_TMR_SHIFT              2
  63 #define CG14_MCR_TMR_MASK               0x0c
  64 #define CG14_MCR_TMENABLE_SHIFT         1
  65 #define CG14_MCR_TMENABLE_MASK          0x02
  66 #define CG14_MCR_RESET_SHIFT            0
  67 #define CG14_MCR_RESET_MASK             0x01
  68 #define CG14_REV_REVISION_SHIFT         4
  69 #define CG14_REV_REVISION_MASK          0xf0
  70 #define CG14_REV_IMPL_SHIFT             0
  71 #define CG14_REV_IMPL_MASK              0x0f
  72 #define CG14_VBR_FRAMEBASE_SHIFT        12
  73 #define CG14_VBR_FRAMEBASE_MASK         0x00fff000
  74 #define CG14_VMCR1_SETUP_SHIFT          0
  75 #define CG14_VMCR1_SETUP_MASK           0x000001ff
  76 #define CG14_VMCR1_VCONFIG_SHIFT        9
  77 #define CG14_VMCR1_VCONFIG_MASK         0x00000e00
  78 #define CG14_VMCR2_REFRESH_SHIFT        0
  79 #define CG14_VMCR2_REFRESH_MASK         0x00000001
  80 #define CG14_VMCR2_TESTROWCNT_SHIFT     1
  81 #define CG14_VMCR2_TESTROWCNT_MASK      0x00000002
  82 #define CG14_VMCR2_FBCONFIG_SHIFT       2
  83 #define CG14_VMCR2_FBCONFIG_MASK        0x0000000c
  84 #define CG14_VCR_REFRESHREQ_SHIFT       0
  85 #define CG14_VCR_REFRESHREQ_MASK        0x000003ff
  86 #define CG14_VCR1_REFRESHENA_SHIFT      10
  87 #define CG14_VCR1_REFRESHENA_MASK       0x00000400
  88 #define CG14_VCA_CAD_SHIFT              0
  89 #define CG14_VCA_CAD_MASK               0x000003ff
  90 #define CG14_VCA_VERS_SHIFT             10
  91 #define CG14_VCA_VERS_MASK              0x00000c00
  92 #define CG14_VCA_RAMSPEED_SHIFT         12
  93 #define CG14_VCA_RAMSPEED_MASK          0x00001000
  94 #define CG14_VCA_8MB_SHIFT              13
  95 #define CG14_VCA_8MB_MASK               0x00002000
  96
  97 #define CG14_MCR_PIXMODE_8              0
  98 #define CG14_MCR_PIXMODE_16             2
  99 #define CG14_MCR_PIXMODE_32             3
 100
 101 struct cg14_regs{
 102         u8 mcr; /* Master Control Reg */
 103         u8 ppr; /* Packed Pixel Reg */
 104         u8 tms[2];      /* Test Mode Status Regs */
 105         u8 msr; /* Master Status Reg */
 106         u8 fsr; /* Fault Status Reg */
 107         u8 rev; /* Revision & Impl */
 108         u8 ccr; /* Clock Control Reg */
 109         u32 tmr;        /* Test Mode Read Back */
 110         u8 mod; /* Monitor Operation Data Reg */
 111         u8 acr; /* Aux Control */
 112         u8 xxx0[6];
 113         u16 hct;        /* Hor Counter */
 114         u16 vct;        /* Vert Counter */
 115         u16 hbs;        /* Hor Blank Start */
 116         u16 hbc;        /* Hor Blank Clear */
 117         u16 hss;        /* Hor Sync Start */
 118         u16 hsc;        /* Hor Sync Clear */
 119         u16 csc;        /* Composite Sync Clear */
 120         u16 vbs;        /* Vert Blank Start */
 121         u16 vbc;        /* Vert Blank Clear */
 122         u16 vss;        /* Vert Sync Start */
 123         u16 vsc;        /* Vert Sync Clear */
 124         u16 xcs;
 125         u16 xcc;
 126         u16 fsa;        /* Fault Status Address */
 127         u16 adr;        /* Address Registers */
 128         u8 xxx1[0xce];
 129         u8 pcg[0x100]; /* Pixel Clock Generator */
 130         u32 vbr;        /* Frame Base Row */
 131         u32 vmcr;       /* VBC Master Control */
 132         u32 vcr;        /* VBC refresh */
 133         u32 vca;        /* VBC Config */
 134 };
 135
 136 #define CG14_CCR_ENABLE 0x04
 137 #define CG14_CCR_SELECT 0x02    /* HW/Full screen */
 138
 139 struct cg14_cursor {
 140         u32 cpl0[32];   /* Enable plane 0 */
 141         u32 cpl1[32];  /* Color selection plane */
 142         u8 ccr; /* Cursor Control Reg */
 143         u8 xxx0[3];
 144         u16 cursx;      /* Cursor x,y position */
 145         u16 cursy;      /* Cursor x,y position */
 146         u32 color0;
 147         u32 color1;
 148         u32 xxx1[0x1bc];
 149         u32 cpl0i[32];  /* Enable plane 0 autoinc */
 150         u32 cpl1i[32]; /* Color selection autoinc */
 151 };
 152
 153 struct cg14_dac {
 154         u8 addr;        /* Address Register */
 155         u8 xxx0[255];
 156         u8 glut;        /* Gamma table */
 157         u8 xxx1[255];
 158         u8 select;      /* Register Select */
 159         u8 xxx2[255];
 160         u8 mode;        /* Mode Register */
 161 };
 162
 163 struct cg14_xlut{
 164         u8 x_xlut [256];
 165         u8 x_xlutd [256];
 166         u8 xxx0[0x600];
 167         u8 x_xlut_inc [256];
 168         u8 x_xlutd_inc [256];
 169 };
 170
 171 /* Color look up table (clut) */
 172 /* Each one of these arrays hold the color lookup table (for 256
 173  * colors) for each MDI page (I assume then there should be 4 MDI
 174  * pages, I still wonder what they are.  I have seen NeXTStep split
 175  * the screen in four parts, while operating in 24 bits mode.  Each
 176  * integer holds 4 values: alpha value (transparency channel, thanks
 177  * go to John Stone (johns@umr.edu) from OpenBSD), red, green and blue
 178  *
 179  * I currently use the clut instead of the Xlut
 180  */
 181 struct cg14_clut {
 182         u32 c_clut [256];
 183         u32 c_clutd [256];    /* i wonder what the 'd' is for */
 184         u32 c_clut_inc [256];
 185         u32 c_clutd_inc [256];
 186 };
 187
 188 #define CG14_MMAP_ENTRIES       16
 189
 190 struct cg14_par {
 191         spinlock_t              lock;
 192         struct cg14_regs        __iomem *regs;
 193         struct cg14_clut        __iomem *clut;
 194         struct cg14_cursor      __iomem *cursor;
 195
 196         u32                     flags;
 197 #define CG14_FLAG_BLANKED       0x00000001
 198
 199         unsigned long           physbase;
 200         unsigned long           iospace;
 201         unsigned long           fbsize;
 202
 203         struct sbus_mmap_map    mmap_map[CG14_MMAP_ENTRIES];
 204
 205         int                     mode;
 206         int                     ramsize;
 207 };
 208
 209 static void __cg14_reset(struct cg14_par *par)
 210 {
 211         struct cg14_regs __iomem *regs = par->regs;
 212         u8 val;
 213
 214         val = sbus_readb(&regs->mcr);
 215         val &= ~(CG14_MCR_PIXMODE_MASK);
 216         sbus_writeb(val, &regs->mcr);
 217 }
 218
 219 static int cg14_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
 220 {
 221         struct cg14_par *par = (struct cg14_par *) info->par;
 222         unsigned long flags;
 223
 224         /* We just use this to catch switches out of
 225          * graphics mode.
 226          */
 227         spin_lock_irqsave(&par->lock, flags);
 228         __cg14_reset(par);
 229         spin_unlock_irqrestore(&par->lock, flags);
 230
 231         if (var->xoffset || var->yoffset || var->vmode)
 232                 return -EINVAL;
 233         return 0;
 234 }
 235
 236 /**
 237  *      cg14_setcolreg - Optional function. Sets a color register.
 238  *      @regno: boolean, 0 copy local, 1 get_user() function
 239  *      @red: frame buffer colormap structure
 240  *      @green: The green value which can be up to 16 bits wide
 241  *      @blue:  The blue value which can be up to 16 bits wide.
 242  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 243  *      @info: frame buffer info structure
 244  */
 245 static int cg14_setcolreg(unsigned regno,
 246                           unsigned red, unsigned green, unsigned blue,
 247                           unsigned transp, struct fb_info *info)
 248 {
 249         struct cg14_par *par = (struct cg14_par *) info->par;
 250         struct cg14_clut __iomem *clut = par->clut;
 251         unsigned long flags;
 252         u32 val;
 253
 254         if (regno >= 256)
 255                 return 1;
 256
 257         red >>= 8;
 258         green >>= 8;
 259         blue >>= 8;
 260         val = (red | (green << 8) | (blue << 16));
 261
 262         spin_lock_irqsave(&par->lock, flags);
 263         sbus_writel(val, &clut->c_clut[regno]);
 264         spin_unlock_irqrestore(&par->lock, flags);
 265
 266         return 0;
 267 }
 268
 269 static int cg14_mmap(struct fb_info *info, struct vm_area_struct *vma)
 270 {
 271         struct cg14_par *par = (struct cg14_par *) info->par;
 272
 273         return sbusfb_mmap_helper(par->mmap_map,
 274                                   par->physbase, par->fbsize,
 275                                   par->iospace, vma);
 276 }
 277
 278 static int cg14_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
 279 {
 280         struct cg14_par *par = (struct cg14_par *) info->par;
 281         struct cg14_regs __iomem *regs = par->regs;
 282         struct mdi_cfginfo kmdi, __user *mdii;
 283         unsigned long flags;
 284         int cur_mode, mode, ret = 0;
 285
 286         switch (cmd) {
 287         case MDI_RESET:
 288                 spin_lock_irqsave(&par->lock, flags);
 289                 __cg14_reset(par);
 290                 spin_unlock_irqrestore(&par->lock, flags);
 291                 break;
 292
 293         case MDI_GET_CFGINFO:
 294                 memset(&kmdi, 0, sizeof(kmdi));
 295
 296                 spin_lock_irqsave(&par->lock, flags);
 297                 kmdi.mdi_type = FBTYPE_MDICOLOR;
 298                 kmdi.mdi_height = info->var.yres;
 299                 kmdi.mdi_width = info->var.xres;
 300                 kmdi.mdi_mode = par->mode;
 301                 kmdi.mdi_pixfreq = 72; /* FIXME */
 302                 kmdi.mdi_size = par->ramsize;
 303                 spin_unlock_irqrestore(&par->lock, flags);
 304
 305                 mdii = (struct mdi_cfginfo __user *) arg;
 306                 if (copy_to_user(mdii, &kmdi, sizeof(kmdi)))
 307                         ret = -EFAULT;
 308                 break;
 309
 310         case MDI_SET_PIXELMODE:
 311                 if (get_user(mode, (int __user *) arg)) {
 312                         ret = -EFAULT;
 313                         break;
 314                 }
 315
 316                 spin_lock_irqsave(&par->lock, flags);
 317                 cur_mode = sbus_readb(&regs->mcr);
 318                 cur_mode &= ~CG14_MCR_PIXMODE_MASK;
 319                 switch(mode) {
 320                 case MDI_32_PIX:
 321                         cur_mode |= (CG14_MCR_PIXMODE_32 <<
 322                                      CG14_MCR_PIXMODE_SHIFT);
 323                         break;
 324
 325                 case MDI_16_PIX:
 326                         cur_mode |= (CG14_MCR_PIXMODE_16 <<
 327                                      CG14_MCR_PIXMODE_SHIFT);
 328                         break;
 329
 330                 case MDI_8_PIX:
 331                         break;
 332
 333                 default:
 334                         ret = -ENOSYS;
 335                         break;
 336                 };
 337                 if (!ret) {
 338                         sbus_writeb(cur_mode, &regs->mcr);
 339                         par->mode = mode;
 340                 }
 341                 spin_unlock_irqrestore(&par->lock, flags);
 342                 break;
 343
 344         default:
 345                 ret = sbusfb_ioctl_helper(cmd, arg, info,
 346                                           FBTYPE_MDICOLOR, 8, par->fbsize);
 347                 break;
 348         };
 349
 350         return ret;
 351 }
 352
 353 /*
 354  *  Initialisation
 355  */
 356
 357 static void __devinit cg14_init_fix(struct fb_info *info, int linebytes,
 358                                     struct device_node *dp)
 359 {
 360         const char *name = dp->name;
 361
 362         strlcpy(info->fix.id, name, sizeof(info->fix.id));
 363
 364         info->fix.type = FB_TYPE_PACKED_PIXELS;
 365         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 366
 367         info->fix.line_length = linebytes;
 368
 369         info->fix.accel = FB_ACCEL_SUN_CG14;
 370 }
 371
 372 static struct sbus_mmap_map __cg14_mmap_map[CG14_MMAP_ENTRIES] __devinitdata = {
 373         {
 374                 .voff   = CG14_REGS,
 375                 .poff   = 0x80000000,
 376                 .size   = 0x1000
 377         },
 378         {
 379                 .voff   = CG14_XLUT,
 380                 .poff   = 0x80003000,
 381                 .size   = 0x1000
 382         },
 383         {
 384                 .voff   = CG14_CLUT1,
 385                 .poff   = 0x80004000,
 386                 .size   = 0x1000
 387         },
 388         {
 389                 .voff   = CG14_CLUT2,
 390                 .poff   = 0x80005000,
 391                 .size   = 0x1000
 392         },
 393         {
 394                 .voff   = CG14_CLUT3,
 395                 .poff   = 0x80006000,
 396                 .size   = 0x1000
 397         },
 398         {
 399                 .voff   = CG3_MMAP_OFFSET - 0x7000,
 400                 .poff   = 0x80000000,
 401                 .size   = 0x7000
 402         },
 403         {
 404                 .voff   = CG3_MMAP_OFFSET,
 405                 .poff   = 0x00000000,
 406                 .size   = SBUS_MMAP_FBSIZE(1)
 407         },
 408         {
 409                 .voff   = MDI_CURSOR_MAP,
 410                 .poff   = 0x80001000,
 411                 .size   = 0x1000
 412         },
 413         {
 414                 .voff   = MDI_CHUNKY_BGR_MAP,
 415                 .poff   = 0x01000000,
 416                 .size   = 0x400000
 417         },
 418         {
 419                 .voff   = MDI_PLANAR_X16_MAP,
 420                 .poff   = 0x02000000,
 421                 .size   = 0x200000
 422         },
 423         {
 424                 .voff   = MDI_PLANAR_C16_MAP,
 425                 .poff   = 0x02800000,
 426                 .size   = 0x200000
 427         },
 428         {
 429                 .voff   = MDI_PLANAR_X32_MAP,
 430                 .poff   = 0x03000000,
 431                 .size   = 0x100000
 432         },
 433         {
 434                 .voff   = MDI_PLANAR_B32_MAP,
 435                 .poff   = 0x03400000,
 436                 .size   = 0x100000
 437         },
 438         {
 439                 .voff   = MDI_PLANAR_G32_MAP,
 440                 .poff   = 0x03800000,
 441                 .size   = 0x100000
 442         },
 443         {
 444                 .voff   = MDI_PLANAR_R32_MAP,
 445                 .poff   = 0x03c00000,
 446                 .size   = 0x100000
 447         },
 448         { .size = 0 }
 449 };
 450
 451 static void cg14_unmap_regs(struct of_device *op, struct fb_info *info,
 452                             struct cg14_par *par)
 453 {
 454         if (par->regs)
 455                 of_iounmap(&op->resource[0],
 456                            par->regs, sizeof(struct cg14_regs));
 457         if (par->clut)
 458                 of_iounmap(&op->resource[0],
 459                            par->clut, sizeof(struct cg14_clut));
 460         if (par->cursor)
 461                 of_iounmap(&op->resource[0],
 462                            par->cursor, sizeof(struct cg14_cursor));
 463         if (info->screen_base)
 464                 of_iounmap(&op->resource[1],
 465                            info->screen_base, par->fbsize);
 466 }
 467
 468 static int __devinit cg14_probe(struct of_device *op, const struct of_device_id *match)
 469 {
 470         struct device_node *dp = op->node;
 471         struct fb_info *info;
 472         struct cg14_par *par;
 473         int is_8mb, linebytes, i, err;
 474
 475         info = framebuffer_alloc(sizeof(struct cg14_par), &op->dev);
 476
 477         err = -ENOMEM;
 478         if (!info)
 479                 goto out_err;
 480         par = info->par;
 481
 482         spin_lock_init(&par->lock);
 483
 484         sbusfb_fill_var(&info->var, dp->node, 8);
 485         info->var.red.length = 8;
 486         info->var.green.length = 8;
 487         info->var.blue.length = 8;
 488
 489         linebytes = of_getintprop_default(dp, "linebytes",
 490                                           info->var.xres);
 491         par->fbsize = PAGE_ALIGN(linebytes * info->var.yres);
 492
 493         if (!strcmp(dp->parent->name, "sbus") ||
 494             !strcmp(dp->parent->name, "sbi")) {
 495                 par->physbase = op->resource[0].start;
 496                 par->iospace = op->resource[0].flags & IORESOURCE_BITS;
 497         } else {
 498                 par->physbase = op->resource[1].start;
 499                 par->iospace = op->resource[0].flags & IORESOURCE_BITS;
 500         }
 501
 502         par->regs = of_ioremap(&op->resource[0], 0,
 503                                sizeof(struct cg14_regs), "cg14 regs");
 504         par->clut = of_ioremap(&op->resource[0], CG14_CLUT1,
 505                                sizeof(struct cg14_clut), "cg14 clut");
 506         par->cursor = of_ioremap(&op->resource[0], CG14_CURSORREGS,
 507                                  sizeof(struct cg14_cursor), "cg14 cursor");
 508
 509         info->screen_base = of_ioremap(&op->resource[1], 0,
 510                                        par->fbsize, "cg14 ram");
 511
 512         if (!par->regs || !par->clut || !par->cursor || !info->screen_base)
 513                 goto out_unmap_regs;
 514
 515         is_8mb = (((op->resource[1].end - op->resource[1].start) + 1) ==
 516                   (8 * 1024 * 1024));
 517
 518         BUILD_BUG_ON(sizeof(par->mmap_map) != sizeof(__cg14_mmap_map));
 519
 520         memcpy(&par->mmap_map, &__cg14_mmap_map, sizeof(par->mmap_map));
 521
 522         for (i = 0; i < CG14_MMAP_ENTRIES; i++) {
 523                 struct sbus_mmap_map *map = &par->mmap_map[i];
 524
 525                 if (!map->size)
 526                         break;
 527                 if (map->poff & 0x80000000)
 528                         map->poff = (map->poff & 0x7fffffff) +
 529                                 (op->resource[0].start -
 530                                  op->resource[1].start);
 531                 if (is_8mb &&
 532                     map->size >= 0x100000 &&
 533                     map->size <= 0x400000)
 534                         map->size *= 2;
 535         }
 536
 537         par->mode = MDI_8_PIX;
 538         par->ramsize = (is_8mb ? 0x800000 : 0x400000);
 539
 540         info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
 541         info->fbops = &cg14_ops;
 542
 543         __cg14_reset(par);
 544
 545         if (fb_alloc_cmap(&info->cmap, 256, 0))
 546                 goto out_unmap_regs;
 547
 548         fb_set_cmap(&info->cmap, info);
 549
 550         cg14_init_fix(info, linebytes, dp);
 551
 552         err = register_framebuffer(info);
 553         if (err < 0)
 554                 goto out_dealloc_cmap;
 555
 556         dev_set_drvdata(&op->dev, info);
 557
 558         printk("%s: cgfourteen at %lx:%lx, %dMB\n",
 559                dp->full_name,
 560                par->iospace, par->physbase,
 561                par->ramsize >> 20);
 562
 563         return 0;
 564
 565 out_dealloc_cmap:
 566         fb_dealloc_cmap(&info->cmap);
 567
 568 out_unmap_regs:
 569         cg14_unmap_regs(op, info, par);
 570
 571 out_err:
 572         return err;
 573 }
 574
 575 static int __devexit cg14_remove(struct of_device *op)
 576 {
 577         struct fb_info *info = dev_get_drvdata(&op->dev);
 578         struct cg14_par *par = info->par;
 579
 580         unregister_framebuffer(info);
 581         fb_dealloc_cmap(&info->cmap);
 582
 583         cg14_unmap_regs(op, info, par);
 584
 585         framebuffer_release(info);
 586
 587         dev_set_drvdata(&op->dev, NULL);
 588
 589         return 0;
 590 }
 591
 592 static struct of_device_id cg14_match[] = {
 593         {
 594                 .name = "cgfourteen",
 595         },
 596         {},
 597 };
 598 MODULE_DEVICE_TABLE(of, cg14_match);
 599
 600 static struct of_platform_driver cg14_driver = {
 601         .name           = "cg14",
 602         .match_table    = cg14_match,
 603         .probe          = cg14_probe,
 604         .remove         = __devexit_p(cg14_remove),
 605 };
 606
 607 int __init cg14_init(void)
 608 {
 609         if (fb_get_options("cg14fb", NULL))
 610                 return -ENODEV;
 611
 612         return of_register_driver(&cg14_driver, &of_bus_type);
 613 }
 614
 615 void __exit cg14_exit(void)
 616 {
 617         of_unregister_driver(&cg14_driver);
 618 }
 619
 620 module_init(cg14_init);
 621 module_exit(cg14_exit);
 622
 623 MODULE_DESCRIPTION("framebuffer driver for CGfourteen chipsets");
 624 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
 625 MODULE_VERSION("2.0");
 626 MODULE_LICENSE("GPL");