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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
  40 /*
  41  *  Frame buffer operations
  42  */
  43
  44 static struct fb_ops tcx_ops = {
  45         .owner                  = THIS_MODULE,
  46         .fb_setcolreg           = tcx_setcolreg,
  47         .fb_blank               = tcx_blank,
  48         .fb_fillrect            = cfb_fillrect,
  49         .fb_copyarea            = cfb_copyarea,
  50         .fb_imageblit           = cfb_imageblit,
  51         .fb_mmap                = tcx_mmap,
  52         .fb_ioctl               = tcx_ioctl,
  53         .fb_cursor              = soft_cursor,
  54 };
  55
  56 /* THC definitions */
  57 #define TCX_THC_MISC_REV_SHIFT       16
  58 #define TCX_THC_MISC_REV_MASK        15
  59 #define TCX_THC_MISC_VSYNC_DIS       (1 << 25)
  60 #define TCX_THC_MISC_HSYNC_DIS       (1 << 24)
  61 #define TCX_THC_MISC_RESET           (1 << 12)
  62 #define TCX_THC_MISC_VIDEO           (1 << 10)
  63 #define TCX_THC_MISC_SYNC            (1 << 9)
  64 #define TCX_THC_MISC_VSYNC           (1 << 8)
  65 #define TCX_THC_MISC_SYNC_ENAB       (1 << 7)
  66 #define TCX_THC_MISC_CURS_RES        (1 << 6)
  67 #define TCX_THC_MISC_INT_ENAB        (1 << 5)
  68 #define TCX_THC_MISC_INT             (1 << 4)
  69 #define TCX_THC_MISC_INIT            0x9f
  70 #define TCX_THC_REV_REV_SHIFT        20
  71 #define TCX_THC_REV_REV_MASK         15
  72 #define TCX_THC_REV_MINREV_SHIFT     28
  73 #define TCX_THC_REV_MINREV_MASK      15
  74
  75 /* The contents are unknown */
  76 struct tcx_tec {
  77         volatile u32 tec_matrix;
  78         volatile u32 tec_clip;
  79         volatile u32 tec_vdc;
  80 };
  81
  82 struct tcx_thc {
  83         volatile u32 thc_rev;
  84         u32 thc_pad0[511];
  85         volatile u32 thc_hs;            /* hsync timing */
  86         volatile u32 thc_hsdvs;
  87         volatile u32 thc_hd;
  88         volatile u32 thc_vs;            /* vsync timing */
  89         volatile u32 thc_vd;
  90         volatile u32 thc_refresh;
  91         volatile u32 thc_misc;
  92         u32 thc_pad1[56];
  93         volatile u32 thc_cursxy;        /* cursor x,y position (16 bits each) */
  94         volatile u32 thc_cursmask[32];  /* cursor mask bits */
  95         volatile u32 thc_cursbits[32];  /* what to show where mask enabled */
  96 };
  97
  98 struct bt_regs {
  99         volatile u32 addr;
 100         volatile u32 color_map;
 101         volatile u32 control;
 102         volatile u32 cursor;
 103 };
 104
 105 #define TCX_MMAP_ENTRIES 14
 106
 107 struct tcx_par {
 108         spinlock_t              lock;
 109         struct bt_regs          __iomem *bt;
 110         struct tcx_thc          __iomem *thc;
 111         struct tcx_tec          __iomem *tec;
 112         volatile u32            __iomem *cplane;
 113
 114         u32                     flags;
 115 #define TCX_FLAG_BLANKED        0x00000001
 116
 117         unsigned long           physbase;
 118         unsigned long           fbsize;
 119
 120         struct sbus_mmap_map    mmap_map[TCX_MMAP_ENTRIES];
 121         int                     lowdepth;
 122
 123         struct sbus_dev         *sdev;
 124         struct list_head        list;
 125 };
 126
 127 /* Reset control plane so that WID is 8-bit plane. */
 128 static void __tcx_set_control_plane (struct tcx_par *par)
 129 {
 130         volatile u32 __iomem *p, *pend;
 131
 132         if (par->lowdepth)
 133                 return;
 134
 135         p = par->cplane;
 136         if (p == NULL)
 137                 return;
 138         for (pend = p + par->fbsize; p < pend; p++) {
 139                 u32 tmp = sbus_readl(p);
 140
 141                 tmp &= 0xffffff;
 142                 sbus_writel(tmp, p);
 143         }
 144 }
 145
 146 static void tcx_reset (struct fb_info *info)
 147 {
 148         struct tcx_par *par = (struct tcx_par *) info->par;
 149         unsigned long flags;
 150
 151         spin_lock_irqsave(&par->lock, flags);
 152         __tcx_set_control_plane(par);
 153         spin_unlock_irqrestore(&par->lock, flags);
 154 }
 155
 156 /**
 157  *      tcx_setcolreg - Optional function. Sets a color register.
 158  *      @regno: boolean, 0 copy local, 1 get_user() function
 159  *      @red: frame buffer colormap structure
 160  *      @green: The green value which can be up to 16 bits wide
 161  *      @blue:  The blue value which can be up to 16 bits wide.
 162  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 163  *      @info: frame buffer info structure
 164  */
 165 static int tcx_setcolreg(unsigned regno,
 166                          unsigned red, unsigned green, unsigned blue,
 167                          unsigned transp, struct fb_info *info)
 168 {
 169         struct tcx_par *par = (struct tcx_par *) info->par;
 170         struct bt_regs __iomem *bt = par->bt;
 171         unsigned long flags;
 172
 173         if (regno >= 256)
 174                 return 1;
 175
 176         red >>= 8;
 177         green >>= 8;
 178         blue >>= 8;
 179
 180         spin_lock_irqsave(&par->lock, flags);
 181
 182         sbus_writel(regno << 24, &bt->addr);
 183         sbus_writel(red << 24, &bt->color_map);
 184         sbus_writel(green << 24, &bt->color_map);
 185         sbus_writel(blue << 24, &bt->color_map);
 186
 187         spin_unlock_irqrestore(&par->lock, flags);
 188
 189         return 0;
 190 }
 191
 192 /**
 193  *      tcx_blank - Optional function.  Blanks the display.
 194  *      @blank_mode: the blank mode we want.
 195  *      @info: frame buffer structure that represents a single frame buffer
 196  */
 197 static int
 198 tcx_blank(int blank, struct fb_info *info)
 199 {
 200         struct tcx_par *par = (struct tcx_par *) info->par;
 201         struct tcx_thc __iomem *thc = par->thc;
 202         unsigned long flags;
 203         u32 val;
 204
 205         spin_lock_irqsave(&par->lock, flags);
 206
 207         val = sbus_readl(&thc->thc_misc);
 208
 209         switch (blank) {
 210         case FB_BLANK_UNBLANK: /* Unblanking */
 211                 val &= ~(TCX_THC_MISC_VSYNC_DIS |
 212                          TCX_THC_MISC_HSYNC_DIS);
 213                 val |= TCX_THC_MISC_VIDEO;
 214                 par->flags &= ~TCX_FLAG_BLANKED;
 215                 break;
 216
 217         case FB_BLANK_NORMAL: /* Normal blanking */
 218                 val &= ~TCX_THC_MISC_VIDEO;
 219                 par->flags |= TCX_FLAG_BLANKED;
 220                 break;
 221
 222         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
 223                 val |= TCX_THC_MISC_VSYNC_DIS;
 224                 break;
 225         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
 226                 val |= TCX_THC_MISC_HSYNC_DIS;
 227                 break;
 228
 229         case FB_BLANK_POWERDOWN: /* Poweroff */
 230                 break;
 231         };
 232
 233         sbus_writel(val, &thc->thc_misc);
 234
 235         spin_unlock_irqrestore(&par->lock, flags);
 236
 237         return 0;
 238 }
 239
 240 static struct sbus_mmap_map __tcx_mmap_map[TCX_MMAP_ENTRIES] = {
 241         {
 242                 .voff   = TCX_RAM8BIT,
 243                 .size   = SBUS_MMAP_FBSIZE(1)
 244         },
 245         {
 246                 .voff   = TCX_RAM24BIT,
 247                 .size   = SBUS_MMAP_FBSIZE(4)
 248         },
 249         {
 250                 .voff   = TCX_UNK3,
 251                 .size   = SBUS_MMAP_FBSIZE(8)
 252         },
 253         {
 254                 .voff   = TCX_UNK4,
 255                 .size   = SBUS_MMAP_FBSIZE(8)
 256         },
 257         {
 258                 .voff   = TCX_CONTROLPLANE,
 259                 .size   = SBUS_MMAP_FBSIZE(4)
 260         },
 261         {
 262                 .voff   = TCX_UNK6,
 263                 .size   = SBUS_MMAP_FBSIZE(8)
 264         },
 265         {
 266                 .voff   = TCX_UNK7,
 267                 .size   = SBUS_MMAP_FBSIZE(8)
 268         },
 269         {
 270                 .voff   = TCX_TEC,
 271                 .size   = PAGE_SIZE
 272         },
 273         {
 274                 .voff   = TCX_BTREGS,
 275                 .size   = PAGE_SIZE
 276         },
 277         {
 278                 .voff   = TCX_THC,
 279                 .size   = PAGE_SIZE
 280         },
 281         {
 282                 .voff   = TCX_DHC,
 283                 .size   = PAGE_SIZE
 284         },
 285         {
 286                 .voff   = TCX_ALT,
 287                 .size   = PAGE_SIZE
 288         },
 289         {
 290                 .voff   = TCX_UNK2,
 291                 .size   = 0x20000
 292         },
 293         { .size = 0 }
 294 };
 295
 296 static int tcx_mmap(struct fb_info *info, struct file *file, struct vm_area_struct *vma)
 297 {
 298         struct tcx_par *par = (struct tcx_par *)info->par;
 299
 300         return sbusfb_mmap_helper(par->mmap_map,
 301                                   par->physbase, par->fbsize,
 302                                   par->sdev->reg_addrs[0].which_io,
 303                                   vma);
 304 }
 305
 306 static int tcx_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 307                      unsigned long arg, struct fb_info *info)
 308 {
 309         struct tcx_par *par = (struct tcx_par *) info->par;
 310
 311         return sbusfb_ioctl_helper(cmd, arg, info,
 312                                    FBTYPE_TCXCOLOR,
 313                                    (par->lowdepth ? 8 : 24),
 314                                    par->fbsize);
 315 }
 316
 317 /*
 318  *  Initialisation
 319  */
 320
 321 static void
 322 tcx_init_fix(struct fb_info *info, int linebytes)
 323 {
 324         struct tcx_par *par = (struct tcx_par *)info->par;
 325         const char *tcx_name;
 326
 327         if (par->lowdepth)
 328                 tcx_name = "TCX8";
 329         else
 330                 tcx_name = "TCX24";
 331
 332         strlcpy(info->fix.id, tcx_name, sizeof(info->fix.id));
 333
 334         info->fix.type = FB_TYPE_PACKED_PIXELS;
 335         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 336
 337         info->fix.line_length = linebytes;
 338
 339         info->fix.accel = FB_ACCEL_SUN_TCX;
 340 }
 341
 342 struct all_info {
 343         struct fb_info info;
 344         struct tcx_par par;
 345         struct list_head list;
 346 };
 347 static LIST_HEAD(tcx_list);
 348
 349 static void tcx_init_one(struct sbus_dev *sdev)
 350 {
 351         struct all_info *all;
 352         int linebytes, i;
 353
 354         all = kmalloc(sizeof(*all), GFP_KERNEL);
 355         if (!all) {
 356                 printk(KERN_ERR "tcx: Cannot allocate memory.\n");
 357                 return;
 358         }
 359         memset(all, 0, sizeof(*all));
 360
 361         INIT_LIST_HEAD(&all->list);
 362
 363         spin_lock_init(&all->par.lock);
 364         all->par.sdev = sdev;
 365
 366         all->par.lowdepth = prom_getbool(sdev->prom_node, "tcx-8-bit");
 367
 368         sbusfb_fill_var(&all->info.var, sdev->prom_node, 8);
 369
 370         linebytes = prom_getintdefault(sdev->prom_node, "linebytes",
 371                                        all->info.var.xres);
 372         all->par.fbsize = PAGE_ALIGN(linebytes * all->info.var.yres);
 373
 374         all->par.tec = sbus_ioremap(&sdev->resource[7], 0,
 375                              sizeof(struct tcx_tec), "tcx tec");
 376         all->par.thc = sbus_ioremap(&sdev->resource[9], 0,
 377                              sizeof(struct tcx_thc), "tcx thc");
 378         all->par.bt = sbus_ioremap(&sdev->resource[8], 0,
 379                              sizeof(struct bt_regs), "tcx dac");
 380         memcpy(&all->par.mmap_map, &__tcx_mmap_map, sizeof(all->par.mmap_map));
 381         if (!all->par.lowdepth) {
 382                 all->par.cplane = sbus_ioremap(&sdev->resource[4], 0,
 383                                      all->par.fbsize * sizeof(u32), "tcx cplane");
 384         } else {
 385                 all->par.mmap_map[1].size = SBUS_MMAP_EMPTY;
 386                 all->par.mmap_map[4].size = SBUS_MMAP_EMPTY;
 387                 all->par.mmap_map[5].size = SBUS_MMAP_EMPTY;
 388                 all->par.mmap_map[6].size = SBUS_MMAP_EMPTY;
 389         }
 390
 391         all->par.physbase = 0;
 392         for (i = 0; i < TCX_MMAP_ENTRIES; i++) {
 393                 int j;
 394
 395                 switch (i) {
 396                 case 10:
 397                         j = 12;
 398                         break;
 399
 400                 case 11: case 12:
 401                         j = i - 1;
 402                         break;
 403
 404                 default:
 405                         j = i;
 406                         break;
 407                 };
 408                 all->par.mmap_map[i].poff = sdev->reg_addrs[j].phys_addr;
 409         }
 410
 411         all->info.flags = FBINFO_DEFAULT;
 412         all->info.fbops = &tcx_ops;
 413 #ifdef CONFIG_SPARC32
 414         all->info.screen_base = (char __iomem *)
 415                 prom_getintdefault(sdev->prom_node, "address", 0);
 416 #endif
 417         if (!all->info.screen_base)
 418                 all->info.screen_base = sbus_ioremap(&sdev->resource[0], 0,
 419                                      all->par.fbsize, "tcx ram");
 420         all->info.par = &all->par;
 421
 422         /* Initialize brooktree DAC. */
 423         sbus_writel(0x04 << 24, &all->par.bt->addr);         /* color planes */
 424         sbus_writel(0xff << 24, &all->par.bt->control);
 425         sbus_writel(0x05 << 24, &all->par.bt->addr);
 426         sbus_writel(0x00 << 24, &all->par.bt->control);
 427         sbus_writel(0x06 << 24, &all->par.bt->addr);         /* overlay plane */
 428         sbus_writel(0x73 << 24, &all->par.bt->control);
 429         sbus_writel(0x07 << 24, &all->par.bt->addr);
 430         sbus_writel(0x00 << 24, &all->par.bt->control);
 431
 432         tcx_reset(&all->info);
 433
 434         tcx_blank(0, &all->info);
 435
 436         if (fb_alloc_cmap(&all->info.cmap, 256, 0)) {
 437                 printk(KERN_ERR "tcx: Could not allocate color map.\n");
 438                 kfree(all);
 439                 return;
 440         }
 441
 442         tcx_init_fix(&all->info, linebytes);
 443
 444         if (register_framebuffer(&all->info) < 0) {
 445                 printk(KERN_ERR "tcx: Could not register framebuffer.\n");
 446                 fb_dealloc_cmap(&all->info.cmap);
 447                 kfree(all);
 448                 return;
 449         }
 450
 451         list_add(&all->list, &tcx_list);
 452
 453         printk("tcx: %s at %lx:%lx, %s\n",
 454                sdev->prom_name,
 455                (long) sdev->reg_addrs[0].which_io,
 456                (long) sdev->reg_addrs[0].phys_addr,
 457                all->par.lowdepth ? "8-bit only" : "24-bit depth");
 458 }
 459
 460 int __init tcx_init(void)
 461 {
 462         struct sbus_bus *sbus;
 463         struct sbus_dev *sdev;
 464
 465         if (fb_get_options("tcxfb", NULL))
 466                 return -ENODEV;
 467
 468         for_all_sbusdev(sdev, sbus) {
 469                 if (!strcmp(sdev->prom_name, "tcx"))
 470                         tcx_init_one(sdev);
 471         }
 472
 473         return 0;
 474 }
 475
 476 void __exit tcx_exit(void)
 477 {
 478         struct list_head *pos, *tmp;
 479
 480         list_for_each_safe(pos, tmp, &tcx_list) {
 481                 struct all_info *all = list_entry(pos, typeof(*all), list);
 482
 483                 unregister_framebuffer(&all->info);
 484                 fb_dealloc_cmap(&all->info.cmap);
 485                 kfree(all);
 486         }
 487 }
 488
 489 int __init
 490 tcx_setup(char *arg)
 491 {
 492         /* No cmdline options yet... */
 493         return 0;
 494 }
 495
 496 module_init(tcx_init);
 497
 498 #ifdef MODULE
 499 module_exit(tcx_exit);
 500 #endif
 501
 502 MODULE_DESCRIPTION("framebuffer driver for TCX chipsets");
 503 MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
 504 MODULE_LICENSE("GPL");