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