drivers/video/tcx.c

   1 /* tcx.c: TCX 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) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
   6  * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
   7  *
   8  * Driver layout based loosely on tgafb.c, see that file for credits.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/string.h>
  15 #include <linux/delay.h>
  16 #include <linux/init.h>
  17 #include <linux/fb.h>
  18 #include <linux/mm.h>
  19 #include <linux/of_device.h>
  20
  21 #include <asm/io.h>
  22 #include <asm/fbio.h>
  23
  24 #include "sbuslib.h"
  25
  26 /*
  27  * Local functions.
  28  */
  29
  30 static int tcx_setcolreg(unsigned, unsigned, unsigned, unsigned,
  31                          unsigned, struct fb_info *);
  32 static int tcx_blank(int, struct fb_info *);
  33
  34 static int tcx_mmap(struct fb_info *, struct vm_area_struct *);
  35 static int tcx_ioctl(struct fb_info *, unsigned int, unsigned long);
  36 static int tcx_pan_display(struct fb_var_screeninfo *, struct fb_info *);
  37
  38 /*
  39  *  Frame buffer operations
  40  */
  41
  42 static struct fb_ops tcx_ops = {
  43         .owner                  = THIS_MODULE,
  44         .fb_setcolreg           = tcx_setcolreg,
  45         .fb_blank               = tcx_blank,
  46         .fb_pan_display         = tcx_pan_display,
  47         .fb_fillrect            = cfb_fillrect,
  48         .fb_copyarea            = cfb_copyarea,
  49         .fb_imageblit           = cfb_imageblit,
  50         .fb_mmap                = tcx_mmap,
  51         .fb_ioctl               = tcx_ioctl,
  52 #ifdef CONFIG_COMPAT
  53         .fb_compat_ioctl        = sbusfb_compat_ioctl,
  54 #endif
  55 };
  56
  57 /* THC definitions */
  58 #define TCX_THC_MISC_REV_SHIFT       16
  59 #define TCX_THC_MISC_REV_MASK        15
  60 #define TCX_THC_MISC_VSYNC_DIS       (1 << 25)
  61 #define TCX_THC_MISC_HSYNC_DIS       (1 << 24)
  62 #define TCX_THC_MISC_RESET           (1 << 12)
  63 #define TCX_THC_MISC_VIDEO           (1 << 10)
  64 #define TCX_THC_MISC_SYNC            (1 << 9)
  65 #define TCX_THC_MISC_VSYNC           (1 << 8)
  66 #define TCX_THC_MISC_SYNC_ENAB       (1 << 7)
  67 #define TCX_THC_MISC_CURS_RES        (1 << 6)
  68 #define TCX_THC_MISC_INT_ENAB        (1 << 5)
  69 #define TCX_THC_MISC_INT             (1 << 4)
  70 #define TCX_THC_MISC_INIT            0x9f
  71 #define TCX_THC_REV_REV_SHIFT        20
  72 #define TCX_THC_REV_REV_MASK         15
  73 #define TCX_THC_REV_MINREV_SHIFT     28
  74 #define TCX_THC_REV_MINREV_MASK      15
  75
  76 /* The contents are unknown */
  77 struct tcx_tec {
  78         u32 tec_matrix;
  79         u32 tec_clip;
  80         u32 tec_vdc;
  81 };
  82
  83 struct tcx_thc {
  84         u32 thc_rev;
  85         u32 thc_pad0[511];
  86         u32 thc_hs;             /* hsync timing */
  87         u32 thc_hsdvs;
  88         u32 thc_hd;
  89         u32 thc_vs;             /* vsync timing */
  90         u32 thc_vd;
  91         u32 thc_refresh;
  92         u32 thc_misc;
  93         u32 thc_pad1[56];
  94         u32 thc_cursxy; /* cursor x,y position (16 bits each) */
  95         u32 thc_cursmask[32];   /* cursor mask bits */
  96         u32 thc_cursbits[32];   /* what to show where mask enabled */
  97 };
  98
  99 struct bt_regs {
 100         u32 addr;
 101         u32 color_map;
 102         u32 control;
 103         u32 cursor;
 104 };
 105
 106 #define TCX_MMAP_ENTRIES 14
 107
 108 struct tcx_par {
 109         spinlock_t              lock;
 110         struct bt_regs          __iomem *bt;
 111         struct tcx_thc          __iomem *thc;
 112         struct tcx_tec          __iomem *tec;
 113         u32                     __iomem *cplane;
 114
 115         u32                     flags;
 116 #define TCX_FLAG_BLANKED        0x00000001
 117
 118         unsigned long           which_io;
 119
 120         struct sbus_mmap_map    mmap_map[TCX_MMAP_ENTRIES];
 121         int                     lowdepth;
 122 };
 123
 124 /* Reset control plane so that WID is 8-bit plane. */
 125 static void __tcx_set_control_plane(struct fb_info *info)
 126 {
 127         struct tcx_par *par = info->par;
 128         u32 __iomem *p, *pend;
 129
 130         if (par->lowdepth)
 131                 return;
 132
 133         p = par->cplane;
 134         if (p == NULL)
 135                 return;
 136         for (pend = p + info->fix.smem_len; p < pend; p++) {
 137                 u32 tmp = sbus_readl(p);
 138
 139                 tmp &= 0xffffff;
 140                 sbus_writel(tmp, p);
 141         }
 142 }
 143
 144 static void tcx_reset(struct fb_info *info)
 145 {
 146         struct tcx_par *par = (struct tcx_par *) info->par;
 147         unsigned long flags;
 148
 149         spin_lock_irqsave(&par->lock, flags);
 150         __tcx_set_control_plane(info);
 151         spin_unlock_irqrestore(&par->lock, flags);
 152 }
 153
 154 static int tcx_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
 155 {
 156         tcx_reset(info);
 157         return 0;
 158 }
 159
 160 /**
 161  *      tcx_setcolreg - Optional function. Sets a color register.
 162  *      @regno: boolean, 0 copy local, 1 get_user() function
 163  *      @red: frame buffer colormap structure
 164  *      @green: The green value which can be up to 16 bits wide
 165  *      @blue:  The blue value which can be up to 16 bits wide.
 166  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 167  *      @info: frame buffer info structure
 168  */
 169 static int tcx_setcolreg(unsigned regno,
 170                          unsigned red, unsigned green, unsigned blue,
 171                          unsigned transp, struct fb_info *info)
 172 {
 173         struct tcx_par *par = (struct tcx_par *) info->par;
 174         struct bt_regs __iomem *bt = par->bt;
 175         unsigned long flags;
 176
 177         if (regno >= 256)
 178                 return 1;
 179
 180         red >>= 8;
 181         green >>= 8;
 182         blue >>= 8;
 183
 184         spin_lock_irqsave(&par->lock, flags);
 185
 186         sbus_writel(regno << 24, &bt->addr);
 187         sbus_writel(red << 24, &bt->color_map);
 188         sbus_writel(green << 24, &bt->color_map);
 189         sbus_writel(blue << 24, &bt->color_map);
 190
 191         spin_unlock_irqrestore(&par->lock, flags);
 192
 193         return 0;
 194 }
 195
 196 /**
 197  *      tcx_blank - Optional function.  Blanks the display.
 198  *      @blank_mode: the blank mode we want.
 199  *      @info: frame buffer structure that represents a single frame buffer
 200  */
 201 static int
 202 tcx_blank(int blank, struct fb_info *info)
 203 {
 204         struct tcx_par *par = (struct tcx_par *) info->par;
 205         struct tcx_thc __iomem *thc = par->thc;
 206         unsigned long flags;
 207         u32 val;
 208
 209         spin_lock_irqsave(&par->lock, flags);
 210
 211         val = sbus_readl(&thc->thc_misc);
 212
 213         switch (blank) {
 214         case FB_BLANK_UNBLANK: /* Unblanking */
 215                 val &= ~(TCX_THC_MISC_VSYNC_DIS |
 216                          TCX_THC_MISC_HSYNC_DIS);
 217                 val |= TCX_THC_MISC_VIDEO;
 218                 par->flags &= ~TCX_FLAG_BLANKED;
 219                 break;
 220
 221         case FB_BLANK_NORMAL: /* Normal blanking */
 222                 val &= ~TCX_THC_MISC_VIDEO;
 223                 par->flags |= TCX_FLAG_BLANKED;
 224                 break;
 225
 226         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
 227                 val |= TCX_THC_MISC_VSYNC_DIS;
 228                 break;
 229         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
 230                 val |= TCX_THC_MISC_HSYNC_DIS;
 231                 break;
 232
 233         case FB_BLANK_POWERDOWN: /* Poweroff */
 234                 break;
 235         }
 236
 237         sbus_writel(val, &thc->thc_misc);
 238
 239         spin_unlock_irqrestore(&par->lock, flags);
 240
 241         return 0;
 242 }
 243
 244 static struct sbus_mmap_map __tcx_mmap_map[TCX_MMAP_ENTRIES] = {
 245         {
 246                 .voff   = TCX_RAM8BIT,
 247                 .size   = SBUS_MMAP_FBSIZE(1)
 248         },
 249         {
 250                 .voff   = TCX_RAM24BIT,
 251                 .size   = SBUS_MMAP_FBSIZE(4)
 252         },
 253         {
 254                 .voff   = TCX_UNK3,
 255                 .size   = SBUS_MMAP_FBSIZE(8)
 256         },
 257         {
 258                 .voff   = TCX_UNK4,
 259                 .size   = SBUS_MMAP_FBSIZE(8)
 260         },
 261         {
 262                 .voff   = TCX_CONTROLPLANE,
 263                 .size   = SBUS_MMAP_FBSIZE(4)
 264         },
 265         {
 266                 .voff   = TCX_UNK6,
 267                 .size   = SBUS_MMAP_FBSIZE(8)
 268         },
 269         {
 270                 .voff   = TCX_UNK7,
 271                 .size   = SBUS_MMAP_FBSIZE(8)
 272         },
 273         {
 274                 .voff   = TCX_TEC,
 275                 .size   = PAGE_SIZE
 276         },
 277         {
 278                 .voff   = TCX_BTREGS,
 279                 .size   = PAGE_SIZE
 280         },
 281         {
 282                 .voff   = TCX_THC,
 283                 .size   = PAGE_SIZE
 284         },
 285         {
 286                 .voff   = TCX_DHC,
 287                 .size   = PAGE_SIZE
 288         },
 289         {
 290                 .voff   = TCX_ALT,
 291                 .size   = PAGE_SIZE
 292         },
 293         {
 294                 .voff   = TCX_UNK2,
 295                 .size   = 0x20000
 296         },
 297         { .size = 0 }
 298 };
 299
 300 static int tcx_mmap(struct fb_info *info, struct vm_area_struct *vma)
 301 {
 302         struct tcx_par *par = (struct tcx_par *)info->par;
 303
 304         return sbusfb_mmap_helper(par->mmap_map,
 305                                   info->fix.smem_start, info->fix.smem_len,
 306                                   par->which_io, vma);
 307 }
 308
 309 static int tcx_ioctl(struct fb_info *info, unsigned int cmd,
 310                      unsigned long arg)
 311 {
 312         struct tcx_par *par = (struct tcx_par *) info->par;
 313
 314         return sbusfb_ioctl_helper(cmd, arg, info,
 315                                    FBTYPE_TCXCOLOR,
 316                                    (par->lowdepth ? 8 : 24),
 317                                    info->fix.smem_len);
 318 }
 319
 320 /*
 321  *  Initialisation
 322  */
 323
 324 static void
 325 tcx_init_fix(struct fb_info *info, int linebytes)
 326 {
 327         struct tcx_par *par = (struct tcx_par *)info->par;
 328         const char *tcx_name;
 329
 330         if (par->lowdepth)
 331                 tcx_name = "TCX8";
 332         else
 333                 tcx_name = "TCX24";
 334
 335         strlcpy(info->fix.id, tcx_name, sizeof(info->fix.id));
 336
 337         info->fix.type = FB_TYPE_PACKED_PIXELS;
 338         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 339
 340         info->fix.line_length = linebytes;
 341
 342         info->fix.accel = FB_ACCEL_SUN_TCX;
 343 }
 344
 345 static void tcx_unmap_regs(struct platform_device *op, struct fb_info *info,
 346                            struct tcx_par *par)
 347 {
 348         if (par->tec)
 349                 of_iounmap(&op->resource[7],
 350                            par->tec, sizeof(struct tcx_tec));
 351         if (par->thc)
 352                 of_iounmap(&op->resource[9],
 353                            par->thc, sizeof(struct tcx_thc));
 354         if (par->bt)
 355                 of_iounmap(&op->resource[8],
 356                            par->bt, sizeof(struct bt_regs));
 357         if (par->cplane)
 358                 of_iounmap(&op->resource[4],
 359                            par->cplane, info->fix.smem_len * sizeof(u32));
 360         if (info->screen_base)
 361                 of_iounmap(&op->resource[0],
 362                            info->screen_base, info->fix.smem_len);
 363 }
 364
 365 static int tcx_probe(struct platform_device *op)
 366 {
 367         struct device_node *dp = op->dev.of_node;
 368         struct fb_info *info;
 369         struct tcx_par *par;
 370         int linebytes, i, err;
 371
 372         info = framebuffer_alloc(sizeof(struct tcx_par), &op->dev);
 373
 374         err = -ENOMEM;
 375         if (!info)
 376                 goto out_err;
 377         par = info->par;
 378
 379         spin_lock_init(&par->lock);
 380
 381         par->lowdepth =
 382                 (of_find_property(dp, "tcx-8-bit", NULL) != NULL);
 383
 384         sbusfb_fill_var(&info->var, dp, 8);
 385         info->var.red.length = 8;
 386         info->var.green.length = 8;
 387         info->var.blue.length = 8;
 388
 389         linebytes = of_getintprop_default(dp, "linebytes",
 390                                           info->var.xres);
 391         info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
 392
 393         par->tec = of_ioremap(&op->resource[7], 0,
 394                                   sizeof(struct tcx_tec), "tcx tec");
 395         par->thc = of_ioremap(&op->resource[9], 0,
 396                                   sizeof(struct tcx_thc), "tcx thc");
 397         par->bt = of_ioremap(&op->resource[8], 0,
 398                                  sizeof(struct bt_regs), "tcx dac");
 399         info->screen_base = of_ioremap(&op->resource[0], 0,
 400                                            info->fix.smem_len, "tcx ram");
 401         if (!par->tec || !par->thc ||
 402             !par->bt || !info->screen_base)
 403                 goto out_unmap_regs;
 404
 405         memcpy(&par->mmap_map, &__tcx_mmap_map, sizeof(par->mmap_map));
 406         if (!par->lowdepth) {
 407                 par->cplane = of_ioremap(&op->resource[4], 0,
 408                                              info->fix.smem_len * sizeof(u32),
 409                                              "tcx cplane");
 410                 if (!par->cplane)
 411                         goto out_unmap_regs;
 412         } else {
 413                 par->mmap_map[1].size = SBUS_MMAP_EMPTY;
 414                 par->mmap_map[4].size = SBUS_MMAP_EMPTY;
 415                 par->mmap_map[5].size = SBUS_MMAP_EMPTY;
 416                 par->mmap_map[6].size = SBUS_MMAP_EMPTY;
 417         }
 418
 419         info->fix.smem_start = op->resource[0].start;
 420         par->which_io = op->resource[0].flags & IORESOURCE_BITS;
 421
 422         for (i = 0; i < TCX_MMAP_ENTRIES; i++) {
 423                 int j;
 424
 425                 switch (i) {
 426                 case 10:
 427                         j = 12;
 428                         break;
 429
 430                 case 11: case 12:
 431                         j = i - 1;
 432                         break;
 433
 434                 default:
 435                         j = i;
 436                         break;
 437                 }
 438                 par->mmap_map[i].poff = op->resource[j].start;
 439         }
 440
 441         info->flags = FBINFO_DEFAULT;
 442         info->fbops = &tcx_ops;
 443
 444         /* Initialize brooktree DAC. */
 445         sbus_writel(0x04 << 24, &par->bt->addr);         /* color planes */
 446         sbus_writel(0xff << 24, &par->bt->control);
 447         sbus_writel(0x05 << 24, &par->bt->addr);
 448         sbus_writel(0x00 << 24, &par->bt->control);
 449         sbus_writel(0x06 << 24, &par->bt->addr);         /* overlay plane */
 450         sbus_writel(0x73 << 24, &par->bt->control);
 451         sbus_writel(0x07 << 24, &par->bt->addr);
 452         sbus_writel(0x00 << 24, &par->bt->control);
 453
 454         tcx_reset(info);
 455
 456         tcx_blank(FB_BLANK_UNBLANK, info);
 457
 458         if (fb_alloc_cmap(&info->cmap, 256, 0))
 459                 goto out_unmap_regs;
 460
 461         fb_set_cmap(&info->cmap, info);
 462         tcx_init_fix(info, linebytes);
 463
 464         err = register_framebuffer(info);
 465         if (err < 0)
 466                 goto out_dealloc_cmap;
 467
 468         dev_set_drvdata(&op->dev, info);
 469
 470         printk(KERN_INFO "%s: TCX at %lx:%lx, %s\n",
 471                dp->full_name,
 472                par->which_io,
 473                info->fix.smem_start,
 474                par->lowdepth ? "8-bit only" : "24-bit depth");
 475
 476         return 0;
 477
 478 out_dealloc_cmap:
 479         fb_dealloc_cmap(&info->cmap);
 480
 481 out_unmap_regs:
 482         tcx_unmap_regs(op, info, par);
 483         framebuffer_release(info);
 484
 485 out_err:
 486         return err;
 487 }
 488
 489 static int tcx_remove(struct platform_device *op)
 490 {
 491         struct fb_info *info = dev_get_drvdata(&op->dev);
 492         struct tcx_par *par = info->par;
 493
 494         unregister_framebuffer(info);
 495         fb_dealloc_cmap(&info->cmap);
 496
 497         tcx_unmap_regs(op, info, par);
 498
 499         framebuffer_release(info);
 500
 501         return 0;
 502 }
 503
 504 static const struct of_device_id tcx_match[] = {
 505         {
 506                 .name = "SUNW,tcx",
 507         },
 508         {},
 509 };
 510 MODULE_DEVICE_TABLE(of, tcx_match);
 511
 512 static struct platform_driver tcx_driver = {
 513         .driver = {
 514                 .name = "tcx",
 515                 .owner = THIS_MODULE,
 516                 .of_match_table = tcx_match,
 517         },
 518         .probe          = tcx_probe,
 519         .remove         = tcx_remove,
 520 };
 521
 522 static int __init tcx_init(void)
 523 {
 524         if (fb_get_options("tcxfb", NULL))
 525                 return -ENODEV;
 526
 527         return platform_driver_register(&tcx_driver);
 528 }
 529
 530 static void __exit tcx_exit(void)
 531 {
 532         platform_driver_unregister(&tcx_driver);
 533 }
 534
 535 module_init(tcx_init);
 536 module_exit(tcx_exit);
 537
 538 MODULE_DESCRIPTION("framebuffer driver for TCX chipsets");
 539 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
 540 MODULE_VERSION("2.0");
 541 MODULE_LICENSE("GPL");