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   1 /* tcx.c: TCX frame buffer driver
   2  *
   3  * Copyright (C) 2003 David S. Miller (davem@redhat.com)
   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/slab.h>
  16 #include <linux/delay.h>
  17 #include <linux/init.h>
  18 #include <linux/fb.h>
  19 #include <linux/mm.h>
  20
  21 #include <asm/io.h>
  22 #include <asm/sbus.h>
  23 #include <asm/oplib.h>
  24 #include <asm/fbio.h>
  25
  26 #include "sbuslib.h"
  27
  28 /*
  29  * Local functions.
  30  */
  31
  32 static int tcx_setcolreg(unsigned, unsigned, unsigned, unsigned,
  33                          unsigned, struct fb_info *);
  34 static int tcx_blank(int, struct fb_info *);
  35
  36 static int tcx_mmap(struct fb_info *, struct file *, struct vm_area_struct *);
  37 static int tcx_ioctl(struct inode *, struct file *, unsigned int,
  38                      unsigned long, struct fb_info *);
  39 static int tcx_pan_display(struct fb_var_screeninfo *, struct fb_info *);
  40
  41 /*
  42  *  Frame buffer operations
  43  */
  44
  45 static struct fb_ops tcx_ops = {
  46         .owner                  = THIS_MODULE,
  47         .fb_setcolreg           = tcx_setcolreg,
  48         .fb_blank               = tcx_blank,
  49         .fb_pan_display         = tcx_pan_display,
  50         .fb_fillrect            = cfb_fillrect,
  51         .fb_copyarea            = cfb_copyarea,
  52         .fb_imageblit           = cfb_imageblit,
  53         .fb_mmap                = tcx_mmap,
  54         .fb_ioctl               = tcx_ioctl,
  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         volatile u32 tec_matrix;
  79         volatile u32 tec_clip;
  80         volatile u32 tec_vdc;
  81 };
  82
  83 struct tcx_thc {
  84         volatile u32 thc_rev;
  85         u32 thc_pad0[511];
  86         volatile u32 thc_hs;            /* hsync timing */
  87         volatile u32 thc_hsdvs;
  88         volatile u32 thc_hd;
  89         volatile u32 thc_vs;            /* vsync timing */
  90         volatile u32 thc_vd;
  91         volatile u32 thc_refresh;
  92         volatile u32 thc_misc;
  93         u32 thc_pad1[56];
  94         volatile u32 thc_cursxy;        /* cursor x,y position (16 bits each) */
  95         volatile u32 thc_cursmask[32];  /* cursor mask bits */
  96         volatile u32 thc_cursbits[32];  /* what to show where mask enabled */
  97 };
  98
  99 struct bt_regs {
 100         volatile u32 addr;
 101         volatile u32 color_map;
 102         volatile u32 control;
 103         volatile 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         volatile u32            __iomem *cplane;
 114
 115         u32                     flags;
 116 #define TCX_FLAG_BLANKED        0x00000001
 117
 118         unsigned long           physbase;
 119         unsigned long           fbsize;
 120
 121         struct sbus_mmap_map    mmap_map[TCX_MMAP_ENTRIES];
 122         int                     lowdepth;
 123
 124         struct sbus_dev         *sdev;
 125         struct list_head        list;
 126 };
 127
 128 /* Reset control plane so that WID is 8-bit plane. */
 129 static void __tcx_set_control_plane (struct tcx_par *par)
 130 {
 131         volatile u32 __iomem *p, *pend;
 132
 133         if (par->lowdepth)
 134                 return;
 135
 136         p = par->cplane;
 137         if (p == NULL)
 138                 return;
 139         for (pend = p + par->fbsize; p < pend; p++) {
 140                 u32 tmp = sbus_readl(p);
 141
 142                 tmp &= 0xffffff;
 143                 sbus_writel(tmp, p);
 144         }
 145 }
 146
 147 static void tcx_reset (struct fb_info *info)
 148 {
 149         struct tcx_par *par = (struct tcx_par *) info->par;
 150         unsigned long flags;
 151
 152         spin_lock_irqsave(&par->lock, flags);
 153         __tcx_set_control_plane(par);
 154         spin_unlock_irqrestore(&par->lock, flags);
 155 }
 156
 157 static int tcx_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
 158 {
 159         tcx_reset(info);
 160         return 0;
 161 }
 162
 163 /**
 164  *      tcx_setcolreg - Optional function. Sets a color register.
 165  *      @regno: boolean, 0 copy local, 1 get_user() function
 166  *      @red: frame buffer colormap structure
 167  *      @green: The green value which can be up to 16 bits wide
 168  *      @blue:  The blue value which can be up to 16 bits wide.
 169  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 170  *      @info: frame buffer info structure
 171  */
 172 static int tcx_setcolreg(unsigned regno,
 173                          unsigned red, unsigned green, unsigned blue,
 174                          unsigned transp, struct fb_info *info)
 175 {
 176         struct tcx_par *par = (struct tcx_par *) info->par;
 177         struct bt_regs __iomem *bt = par->bt;
 178         unsigned long flags;
 179
 180         if (regno >= 256)
 181                 return 1;
 182
 183         red >>= 8;
 184         green >>= 8;
 185         blue >>= 8;
 186
 187         spin_lock_irqsave(&par->lock, flags);
 188
 189         sbus_writel(regno << 24, &bt->addr);
 190         sbus_writel(red << 24, &bt->color_map);
 191         sbus_writel(green << 24, &bt->color_map);
 192         sbus_writel(blue << 24, &bt->color_map);
 193
 194         spin_unlock_irqrestore(&par->lock, flags);
 195
 196         return 0;
 197 }
 198
 199 /**
 200  *      tcx_blank - Optional function.  Blanks the display.
 201  *      @blank_mode: the blank mode we want.
 202  *      @info: frame buffer structure that represents a single frame buffer
 203  */
 204 static int
 205 tcx_blank(int blank, struct fb_info *info)
 206 {
 207         struct tcx_par *par = (struct tcx_par *) info->par;
 208         struct tcx_thc __iomem *thc = par->thc;
 209         unsigned long flags;
 210         u32 val;
 211
 212         spin_lock_irqsave(&par->lock, flags);
 213
 214         val = sbus_readl(&thc->thc_misc);
 215
 216         switch (blank) {
 217         case FB_BLANK_UNBLANK: /* Unblanking */
 218                 val &= ~(TCX_THC_MISC_VSYNC_DIS |
 219                          TCX_THC_MISC_HSYNC_DIS);
 220                 val |= TCX_THC_MISC_VIDEO;
 221                 par->flags &= ~TCX_FLAG_BLANKED;
 222                 break;
 223
 224         case FB_BLANK_NORMAL: /* Normal blanking */
 225                 val &= ~TCX_THC_MISC_VIDEO;
 226                 par->flags |= TCX_FLAG_BLANKED;
 227                 break;
 228
 229         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
 230                 val |= TCX_THC_MISC_VSYNC_DIS;
 231                 break;
 232         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
 233                 val |= TCX_THC_MISC_HSYNC_DIS;
 234                 break;
 235
 236         case FB_BLANK_POWERDOWN: /* Poweroff */
 237                 break;
 238         };
 239
 240         sbus_writel(val, &thc->thc_misc);
 241
 242         spin_unlock_irqrestore(&par->lock, flags);
 243
 244         return 0;
 245 }
 246
 247 static struct sbus_mmap_map __tcx_mmap_map[TCX_MMAP_ENTRIES] = {
 248         {
 249                 .voff   = TCX_RAM8BIT,
 250                 .size   = SBUS_MMAP_FBSIZE(1)
 251         },
 252         {
 253                 .voff   = TCX_RAM24BIT,
 254                 .size   = SBUS_MMAP_FBSIZE(4)
 255         },
 256         {
 257                 .voff   = TCX_UNK3,
 258                 .size   = SBUS_MMAP_FBSIZE(8)
 259         },
 260         {
 261                 .voff   = TCX_UNK4,
 262                 .size   = SBUS_MMAP_FBSIZE(8)
 263         },
 264         {
 265                 .voff   = TCX_CONTROLPLANE,
 266                 .size   = SBUS_MMAP_FBSIZE(4)
 267         },
 268         {
 269                 .voff   = TCX_UNK6,
 270                 .size   = SBUS_MMAP_FBSIZE(8)
 271         },
 272         {
 273                 .voff   = TCX_UNK7,
 274                 .size   = SBUS_MMAP_FBSIZE(8)
 275         },
 276         {
 277                 .voff   = TCX_TEC,
 278                 .size   = PAGE_SIZE
 279         },
 280         {
 281                 .voff   = TCX_BTREGS,
 282                 .size   = PAGE_SIZE
 283         },
 284         {
 285                 .voff   = TCX_THC,
 286                 .size   = PAGE_SIZE
 287         },
 288         {
 289                 .voff   = TCX_DHC,
 290                 .size   = PAGE_SIZE
 291         },
 292         {
 293                 .voff   = TCX_ALT,
 294                 .size   = PAGE_SIZE
 295         },
 296         {
 297                 .voff   = TCX_UNK2,
 298                 .size   = 0x20000
 299         },
 300         { .size = 0 }
 301 };
 302
 303 static int tcx_mmap(struct fb_info *info, struct file *file, struct vm_area_struct *vma)
 304 {
 305         struct tcx_par *par = (struct tcx_par *)info->par;
 306
 307         return sbusfb_mmap_helper(par->mmap_map,
 308                                   par->physbase, par->fbsize,
 309                                   par->sdev->reg_addrs[0].which_io,
 310                                   vma);
 311 }
 312
 313 static int tcx_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 314                      unsigned long arg, struct fb_info *info)
 315 {
 316         struct tcx_par *par = (struct tcx_par *) info->par;
 317
 318         return sbusfb_ioctl_helper(cmd, arg, info,
 319                                    FBTYPE_TCXCOLOR,
 320                                    (par->lowdepth ? 8 : 24),
 321                                    par->fbsize);
 322 }
 323
 324 /*
 325  *  Initialisation
 326  */
 327
 328 static void
 329 tcx_init_fix(struct fb_info *info, int linebytes)
 330 {
 331         struct tcx_par *par = (struct tcx_par *)info->par;
 332         const char *tcx_name;
 333
 334         if (par->lowdepth)
 335                 tcx_name = "TCX8";
 336         else
 337                 tcx_name = "TCX24";
 338
 339         strlcpy(info->fix.id, tcx_name, sizeof(info->fix.id));
 340
 341         info->fix.type = FB_TYPE_PACKED_PIXELS;
 342         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 343
 344         info->fix.line_length = linebytes;
 345
 346         info->fix.accel = FB_ACCEL_SUN_TCX;
 347 }
 348
 349 struct all_info {
 350         struct fb_info info;
 351         struct tcx_par par;
 352         struct list_head list;
 353 };
 354 static LIST_HEAD(tcx_list);
 355
 356 static void tcx_init_one(struct sbus_dev *sdev)
 357 {
 358         struct all_info *all;
 359         int linebytes, i;
 360
 361         all = kmalloc(sizeof(*all), GFP_KERNEL);
 362         if (!all) {
 363                 printk(KERN_ERR "tcx: Cannot allocate memory.\n");
 364                 return;
 365         }
 366         memset(all, 0, sizeof(*all));
 367
 368         INIT_LIST_HEAD(&all->list);
 369
 370         spin_lock_init(&all->par.lock);
 371         all->par.sdev = sdev;
 372
 373         all->par.lowdepth = prom_getbool(sdev->prom_node, "tcx-8-bit");
 374
 375         sbusfb_fill_var(&all->info.var, sdev->prom_node, 8);
 376         all->info.var.red.length = 8;
 377         all->info.var.green.length = 8;
 378         all->info.var.blue.length = 8;
 379
 380         linebytes = prom_getintdefault(sdev->prom_node, "linebytes",
 381                                        all->info.var.xres);
 382         all->par.fbsize = PAGE_ALIGN(linebytes * all->info.var.yres);
 383
 384         all->par.tec = sbus_ioremap(&sdev->resource[7], 0,
 385                              sizeof(struct tcx_tec), "tcx tec");
 386         all->par.thc = sbus_ioremap(&sdev->resource[9], 0,
 387                              sizeof(struct tcx_thc), "tcx thc");
 388         all->par.bt = sbus_ioremap(&sdev->resource[8], 0,
 389                              sizeof(struct bt_regs), "tcx dac");
 390         memcpy(&all->par.mmap_map, &__tcx_mmap_map, sizeof(all->par.mmap_map));
 391         if (!all->par.lowdepth) {
 392                 all->par.cplane = sbus_ioremap(&sdev->resource[4], 0,
 393                                      all->par.fbsize * sizeof(u32), "tcx cplane");
 394         } else {
 395                 all->par.mmap_map[1].size = SBUS_MMAP_EMPTY;
 396                 all->par.mmap_map[4].size = SBUS_MMAP_EMPTY;
 397                 all->par.mmap_map[5].size = SBUS_MMAP_EMPTY;
 398                 all->par.mmap_map[6].size = SBUS_MMAP_EMPTY;
 399         }
 400
 401         all->par.physbase = 0;
 402         for (i = 0; i < TCX_MMAP_ENTRIES; i++) {
 403                 int j;
 404
 405                 switch (i) {
 406                 case 10:
 407                         j = 12;
 408                         break;
 409
 410                 case 11: case 12:
 411                         j = i - 1;
 412                         break;
 413
 414                 default:
 415                         j = i;
 416                         break;
 417                 };
 418                 all->par.mmap_map[i].poff = sdev->reg_addrs[j].phys_addr;
 419         }
 420
 421         all->info.flags = FBINFO_DEFAULT;
 422         all->info.fbops = &tcx_ops;
 423 #ifdef CONFIG_SPARC32
 424         all->info.screen_base = (char __iomem *)
 425                 prom_getintdefault(sdev->prom_node, "address", 0);
 426 #endif
 427         if (!all->info.screen_base)
 428                 all->info.screen_base = sbus_ioremap(&sdev->resource[0], 0,
 429                                      all->par.fbsize, "tcx ram");
 430         all->info.par = &all->par;
 431
 432         /* Initialize brooktree DAC. */
 433         sbus_writel(0x04 << 24, &all->par.bt->addr);         /* color planes */
 434         sbus_writel(0xff << 24, &all->par.bt->control);
 435         sbus_writel(0x05 << 24, &all->par.bt->addr);
 436         sbus_writel(0x00 << 24, &all->par.bt->control);
 437         sbus_writel(0x06 << 24, &all->par.bt->addr);         /* overlay plane */
 438         sbus_writel(0x73 << 24, &all->par.bt->control);
 439         sbus_writel(0x07 << 24, &all->par.bt->addr);
 440         sbus_writel(0x00 << 24, &all->par.bt->control);
 441
 442         tcx_reset(&all->info);
 443
 444         tcx_blank(0, &all->info);
 445
 446         if (fb_alloc_cmap(&all->info.cmap, 256, 0)) {
 447                 printk(KERN_ERR "tcx: Could not allocate color map.\n");
 448                 kfree(all);
 449                 return;
 450         }
 451
 452         fb_set_cmap(&all->info.cmap, &all->info);
 453         tcx_init_fix(&all->info, linebytes);
 454
 455         if (register_framebuffer(&all->info) < 0) {
 456                 printk(KERN_ERR "tcx: Could not register framebuffer.\n");
 457                 fb_dealloc_cmap(&all->info.cmap);
 458                 kfree(all);
 459                 return;
 460         }
 461
 462         list_add(&all->list, &tcx_list);
 463
 464         printk("tcx: %s at %lx:%lx, %s\n",
 465                sdev->prom_name,
 466                (long) sdev->reg_addrs[0].which_io,
 467                (long) sdev->reg_addrs[0].phys_addr,
 468                all->par.lowdepth ? "8-bit only" : "24-bit depth");
 469 }
 470
 471 int __init tcx_init(void)
 472 {
 473         struct sbus_bus *sbus;
 474         struct sbus_dev *sdev;
 475
 476         if (fb_get_options("tcxfb", NULL))
 477                 return -ENODEV;
 478
 479         for_all_sbusdev(sdev, sbus) {
 480                 if (!strcmp(sdev->prom_name, "SUNW,tcx"))
 481                         tcx_init_one(sdev);
 482         }
 483
 484         return 0;
 485 }
 486
 487 void __exit tcx_exit(void)
 488 {
 489         struct list_head *pos, *tmp;
 490
 491         list_for_each_safe(pos, tmp, &tcx_list) {
 492                 struct all_info *all = list_entry(pos, typeof(*all), list);
 493
 494                 unregister_framebuffer(&all->info);
 495                 fb_dealloc_cmap(&all->info.cmap);
 496                 kfree(all);
 497         }
 498 }
 499
 500 int __init
 501 tcx_setup(char *arg)
 502 {
 503         /* No cmdline options yet... */
 504         return 0;
 505 }
 506
 507 module_init(tcx_init);
 508
 509 #ifdef MODULE
 510 module_exit(tcx_exit);
 511 #endif
 512
 513 MODULE_DESCRIPTION("framebuffer driver for TCX chipsets");
 514 MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
 515 MODULE_LICENSE("GPL");