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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 #ifdef CONFIG_COMPAT
  56         .fb_compat_ioctl        = sbusfb_compat_ioctl,
  57 #endif
  58 };
  59
  60 /* THC definitions */
  61 #define TCX_THC_MISC_REV_SHIFT       16
  62 #define TCX_THC_MISC_REV_MASK        15
  63 #define TCX_THC_MISC_VSYNC_DIS       (1 << 25)
  64 #define TCX_THC_MISC_HSYNC_DIS       (1 << 24)
  65 #define TCX_THC_MISC_RESET           (1 << 12)
  66 #define TCX_THC_MISC_VIDEO           (1 << 10)
  67 #define TCX_THC_MISC_SYNC            (1 << 9)
  68 #define TCX_THC_MISC_VSYNC           (1 << 8)
  69 #define TCX_THC_MISC_SYNC_ENAB       (1 << 7)
  70 #define TCX_THC_MISC_CURS_RES        (1 << 6)
  71 #define TCX_THC_MISC_INT_ENAB        (1 << 5)
  72 #define TCX_THC_MISC_INT             (1 << 4)
  73 #define TCX_THC_MISC_INIT            0x9f
  74 #define TCX_THC_REV_REV_SHIFT        20
  75 #define TCX_THC_REV_REV_MASK         15
  76 #define TCX_THC_REV_MINREV_SHIFT     28
  77 #define TCX_THC_REV_MINREV_MASK      15
  78
  79 /* The contents are unknown */
  80 struct tcx_tec {
  81         volatile u32 tec_matrix;
  82         volatile u32 tec_clip;
  83         volatile u32 tec_vdc;
  84 };
  85
  86 struct tcx_thc {
  87         volatile u32 thc_rev;
  88         u32 thc_pad0[511];
  89         volatile u32 thc_hs;            /* hsync timing */
  90         volatile u32 thc_hsdvs;
  91         volatile u32 thc_hd;
  92         volatile u32 thc_vs;            /* vsync timing */
  93         volatile u32 thc_vd;
  94         volatile u32 thc_refresh;
  95         volatile u32 thc_misc;
  96         u32 thc_pad1[56];
  97         volatile u32 thc_cursxy;        /* cursor x,y position (16 bits each) */
  98         volatile u32 thc_cursmask[32];  /* cursor mask bits */
  99         volatile u32 thc_cursbits[32];  /* what to show where mask enabled */
 100 };
 101
 102 struct bt_regs {
 103         volatile u32 addr;
 104         volatile u32 color_map;
 105         volatile u32 control;
 106         volatile u32 cursor;
 107 };
 108
 109 #define TCX_MMAP_ENTRIES 14
 110
 111 struct tcx_par {
 112         spinlock_t              lock;
 113         struct bt_regs          __iomem *bt;
 114         struct tcx_thc          __iomem *thc;
 115         struct tcx_tec          __iomem *tec;
 116         volatile u32            __iomem *cplane;
 117
 118         u32                     flags;
 119 #define TCX_FLAG_BLANKED        0x00000001
 120
 121         unsigned long           physbase;
 122         unsigned long           fbsize;
 123
 124         struct sbus_mmap_map    mmap_map[TCX_MMAP_ENTRIES];
 125         int                     lowdepth;
 126
 127         struct sbus_dev         *sdev;
 128         struct list_head        list;
 129 };
 130
 131 /* Reset control plane so that WID is 8-bit plane. */
 132 static void __tcx_set_control_plane (struct tcx_par *par)
 133 {
 134         volatile u32 __iomem *p, *pend;
 135
 136         if (par->lowdepth)
 137                 return;
 138
 139         p = par->cplane;
 140         if (p == NULL)
 141                 return;
 142         for (pend = p + par->fbsize; p < pend; p++) {
 143                 u32 tmp = sbus_readl(p);
 144
 145                 tmp &= 0xffffff;
 146                 sbus_writel(tmp, p);
 147         }
 148 }
 149
 150 static void tcx_reset (struct fb_info *info)
 151 {
 152         struct tcx_par *par = (struct tcx_par *) info->par;
 153         unsigned long flags;
 154
 155         spin_lock_irqsave(&par->lock, flags);
 156         __tcx_set_control_plane(par);
 157         spin_unlock_irqrestore(&par->lock, flags);
 158 }
 159
 160 static int tcx_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
 161 {
 162         tcx_reset(info);
 163         return 0;
 164 }
 165
 166 /**
 167  *      tcx_setcolreg - Optional function. Sets a color register.
 168  *      @regno: boolean, 0 copy local, 1 get_user() function
 169  *      @red: frame buffer colormap structure
 170  *      @green: The green value which can be up to 16 bits wide
 171  *      @blue:  The blue value which can be up to 16 bits wide.
 172  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 173  *      @info: frame buffer info structure
 174  */
 175 static int tcx_setcolreg(unsigned regno,
 176                          unsigned red, unsigned green, unsigned blue,
 177                          unsigned transp, struct fb_info *info)
 178 {
 179         struct tcx_par *par = (struct tcx_par *) info->par;
 180         struct bt_regs __iomem *bt = par->bt;
 181         unsigned long flags;
 182
 183         if (regno >= 256)
 184                 return 1;
 185
 186         red >>= 8;
 187         green >>= 8;
 188         blue >>= 8;
 189
 190         spin_lock_irqsave(&par->lock, flags);
 191
 192         sbus_writel(regno << 24, &bt->addr);
 193         sbus_writel(red << 24, &bt->color_map);
 194         sbus_writel(green << 24, &bt->color_map);
 195         sbus_writel(blue << 24, &bt->color_map);
 196
 197         spin_unlock_irqrestore(&par->lock, flags);
 198
 199         return 0;
 200 }
 201
 202 /**
 203  *      tcx_blank - Optional function.  Blanks the display.
 204  *      @blank_mode: the blank mode we want.
 205  *      @info: frame buffer structure that represents a single frame buffer
 206  */
 207 static int
 208 tcx_blank(int blank, struct fb_info *info)
 209 {
 210         struct tcx_par *par = (struct tcx_par *) info->par;
 211         struct tcx_thc __iomem *thc = par->thc;
 212         unsigned long flags;
 213         u32 val;
 214
 215         spin_lock_irqsave(&par->lock, flags);
 216
 217         val = sbus_readl(&thc->thc_misc);
 218
 219         switch (blank) {
 220         case FB_BLANK_UNBLANK: /* Unblanking */
 221                 val &= ~(TCX_THC_MISC_VSYNC_DIS |
 222                          TCX_THC_MISC_HSYNC_DIS);
 223                 val |= TCX_THC_MISC_VIDEO;
 224                 par->flags &= ~TCX_FLAG_BLANKED;
 225                 break;
 226
 227         case FB_BLANK_NORMAL: /* Normal blanking */
 228                 val &= ~TCX_THC_MISC_VIDEO;
 229                 par->flags |= TCX_FLAG_BLANKED;
 230                 break;
 231
 232         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
 233                 val |= TCX_THC_MISC_VSYNC_DIS;
 234                 break;
 235         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
 236                 val |= TCX_THC_MISC_HSYNC_DIS;
 237                 break;
 238
 239         case FB_BLANK_POWERDOWN: /* Poweroff */
 240                 break;
 241         };
 242
 243         sbus_writel(val, &thc->thc_misc);
 244
 245         spin_unlock_irqrestore(&par->lock, flags);
 246
 247         return 0;
 248 }
 249
 250 static struct sbus_mmap_map __tcx_mmap_map[TCX_MMAP_ENTRIES] = {
 251         {
 252                 .voff   = TCX_RAM8BIT,
 253                 .size   = SBUS_MMAP_FBSIZE(1)
 254         },
 255         {
 256                 .voff   = TCX_RAM24BIT,
 257                 .size   = SBUS_MMAP_FBSIZE(4)
 258         },
 259         {
 260                 .voff   = TCX_UNK3,
 261                 .size   = SBUS_MMAP_FBSIZE(8)
 262         },
 263         {
 264                 .voff   = TCX_UNK4,
 265                 .size   = SBUS_MMAP_FBSIZE(8)
 266         },
 267         {
 268                 .voff   = TCX_CONTROLPLANE,
 269                 .size   = SBUS_MMAP_FBSIZE(4)
 270         },
 271         {
 272                 .voff   = TCX_UNK6,
 273                 .size   = SBUS_MMAP_FBSIZE(8)
 274         },
 275         {
 276                 .voff   = TCX_UNK7,
 277                 .size   = SBUS_MMAP_FBSIZE(8)
 278         },
 279         {
 280                 .voff   = TCX_TEC,
 281                 .size   = PAGE_SIZE
 282         },
 283         {
 284                 .voff   = TCX_BTREGS,
 285                 .size   = PAGE_SIZE
 286         },
 287         {
 288                 .voff   = TCX_THC,
 289                 .size   = PAGE_SIZE
 290         },
 291         {
 292                 .voff   = TCX_DHC,
 293                 .size   = PAGE_SIZE
 294         },
 295         {
 296                 .voff   = TCX_ALT,
 297                 .size   = PAGE_SIZE
 298         },
 299         {
 300                 .voff   = TCX_UNK2,
 301                 .size   = 0x20000
 302         },
 303         { .size = 0 }
 304 };
 305
 306 static int tcx_mmap(struct fb_info *info, struct file *file, struct vm_area_struct *vma)
 307 {
 308         struct tcx_par *par = (struct tcx_par *)info->par;
 309
 310         return sbusfb_mmap_helper(par->mmap_map,
 311                                   par->physbase, par->fbsize,
 312                                   par->sdev->reg_addrs[0].which_io,
 313                                   vma);
 314 }
 315
 316 static int tcx_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 317                      unsigned long arg, struct fb_info *info)
 318 {
 319         struct tcx_par *par = (struct tcx_par *) info->par;
 320
 321         return sbusfb_ioctl_helper(cmd, arg, info,
 322                                    FBTYPE_TCXCOLOR,
 323                                    (par->lowdepth ? 8 : 24),
 324                                    par->fbsize);
 325 }
 326
 327 /*
 328  *  Initialisation
 329  */
 330
 331 static void
 332 tcx_init_fix(struct fb_info *info, int linebytes)
 333 {
 334         struct tcx_par *par = (struct tcx_par *)info->par;
 335         const char *tcx_name;
 336
 337         if (par->lowdepth)
 338                 tcx_name = "TCX8";
 339         else
 340                 tcx_name = "TCX24";
 341
 342         strlcpy(info->fix.id, tcx_name, sizeof(info->fix.id));
 343
 344         info->fix.type = FB_TYPE_PACKED_PIXELS;
 345         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 346
 347         info->fix.line_length = linebytes;
 348
 349         info->fix.accel = FB_ACCEL_SUN_TCX;
 350 }
 351
 352 struct all_info {
 353         struct fb_info info;
 354         struct tcx_par par;
 355         struct list_head list;
 356 };
 357 static LIST_HEAD(tcx_list);
 358
 359 static void tcx_init_one(struct sbus_dev *sdev)
 360 {
 361         struct all_info *all;
 362         int linebytes, i;
 363
 364         all = kmalloc(sizeof(*all), GFP_KERNEL);
 365         if (!all) {
 366                 printk(KERN_ERR "tcx: Cannot allocate memory.\n");
 367                 return;
 368         }
 369         memset(all, 0, sizeof(*all));
 370
 371         INIT_LIST_HEAD(&all->list);
 372
 373         spin_lock_init(&all->par.lock);
 374         all->par.sdev = sdev;
 375
 376         all->par.lowdepth = prom_getbool(sdev->prom_node, "tcx-8-bit");
 377
 378         sbusfb_fill_var(&all->info.var, sdev->prom_node, 8);
 379         all->info.var.red.length = 8;
 380         all->info.var.green.length = 8;
 381         all->info.var.blue.length = 8;
 382
 383         linebytes = prom_getintdefault(sdev->prom_node, "linebytes",
 384                                        all->info.var.xres);
 385         all->par.fbsize = PAGE_ALIGN(linebytes * all->info.var.yres);
 386
 387         all->par.tec = sbus_ioremap(&sdev->resource[7], 0,
 388                              sizeof(struct tcx_tec), "tcx tec");
 389         all->par.thc = sbus_ioremap(&sdev->resource[9], 0,
 390                              sizeof(struct tcx_thc), "tcx thc");
 391         all->par.bt = sbus_ioremap(&sdev->resource[8], 0,
 392                              sizeof(struct bt_regs), "tcx dac");
 393         memcpy(&all->par.mmap_map, &__tcx_mmap_map, sizeof(all->par.mmap_map));
 394         if (!all->par.lowdepth) {
 395                 all->par.cplane = sbus_ioremap(&sdev->resource[4], 0,
 396                                      all->par.fbsize * sizeof(u32), "tcx cplane");
 397         } else {
 398                 all->par.mmap_map[1].size = SBUS_MMAP_EMPTY;
 399                 all->par.mmap_map[4].size = SBUS_MMAP_EMPTY;
 400                 all->par.mmap_map[5].size = SBUS_MMAP_EMPTY;
 401                 all->par.mmap_map[6].size = SBUS_MMAP_EMPTY;
 402         }
 403
 404         all->par.physbase = 0;
 405         for (i = 0; i < TCX_MMAP_ENTRIES; i++) {
 406                 int j;
 407
 408                 switch (i) {
 409                 case 10:
 410                         j = 12;
 411                         break;
 412
 413                 case 11: case 12:
 414                         j = i - 1;
 415                         break;
 416
 417                 default:
 418                         j = i;
 419                         break;
 420                 };
 421                 all->par.mmap_map[i].poff = sdev->reg_addrs[j].phys_addr;
 422         }
 423
 424         all->info.flags = FBINFO_DEFAULT;
 425         all->info.fbops = &tcx_ops;
 426 #ifdef CONFIG_SPARC32
 427         all->info.screen_base = (char __iomem *)
 428                 prom_getintdefault(sdev->prom_node, "address", 0);
 429 #endif
 430         if (!all->info.screen_base)
 431                 all->info.screen_base = sbus_ioremap(&sdev->resource[0], 0,
 432                                      all->par.fbsize, "tcx ram");
 433         all->info.par = &all->par;
 434
 435         /* Initialize brooktree DAC. */
 436         sbus_writel(0x04 << 24, &all->par.bt->addr);         /* color planes */
 437         sbus_writel(0xff << 24, &all->par.bt->control);
 438         sbus_writel(0x05 << 24, &all->par.bt->addr);
 439         sbus_writel(0x00 << 24, &all->par.bt->control);
 440         sbus_writel(0x06 << 24, &all->par.bt->addr);         /* overlay plane */
 441         sbus_writel(0x73 << 24, &all->par.bt->control);
 442         sbus_writel(0x07 << 24, &all->par.bt->addr);
 443         sbus_writel(0x00 << 24, &all->par.bt->control);
 444
 445         tcx_reset(&all->info);
 446
 447         tcx_blank(0, &all->info);
 448
 449         if (fb_alloc_cmap(&all->info.cmap, 256, 0)) {
 450                 printk(KERN_ERR "tcx: Could not allocate color map.\n");
 451                 kfree(all);
 452                 return;
 453         }
 454
 455         fb_set_cmap(&all->info.cmap, &all->info);
 456         tcx_init_fix(&all->info, linebytes);
 457
 458         if (register_framebuffer(&all->info) < 0) {
 459                 printk(KERN_ERR "tcx: Could not register framebuffer.\n");
 460                 fb_dealloc_cmap(&all->info.cmap);
 461                 kfree(all);
 462                 return;
 463         }
 464
 465         list_add(&all->list, &tcx_list);
 466
 467         printk("tcx: %s at %lx:%lx, %s\n",
 468                sdev->prom_name,
 469                (long) sdev->reg_addrs[0].which_io,
 470                (long) sdev->reg_addrs[0].phys_addr,
 471                all->par.lowdepth ? "8-bit only" : "24-bit depth");
 472 }
 473
 474 int __init tcx_init(void)
 475 {
 476         struct sbus_bus *sbus;
 477         struct sbus_dev *sdev;
 478
 479         if (fb_get_options("tcxfb", NULL))
 480                 return -ENODEV;
 481
 482         for_all_sbusdev(sdev, sbus) {
 483                 if (!strcmp(sdev->prom_name, "SUNW,tcx"))
 484                         tcx_init_one(sdev);
 485         }
 486
 487         return 0;
 488 }
 489
 490 void __exit tcx_exit(void)
 491 {
 492         struct list_head *pos, *tmp;
 493
 494         list_for_each_safe(pos, tmp, &tcx_list) {
 495                 struct all_info *all = list_entry(pos, typeof(*all), list);
 496
 497                 unregister_framebuffer(&all->info);
 498                 fb_dealloc_cmap(&all->info.cmap);
 499                 kfree(all);
 500         }
 501 }
 502
 503 int __init
 504 tcx_setup(char *arg)
 505 {
 506         /* No cmdline options yet... */
 507         return 0;
 508 }
 509
 510 module_init(tcx_init);
 511
 512 #ifdef MODULE
 513 module_exit(tcx_exit);
 514 #endif
 515
 516 MODULE_DESCRIPTION("framebuffer driver for TCX chipsets");
 517 MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
 518 MODULE_LICENSE("GPL");