linux/drivers/video/tcx.c
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   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
  30static int tcx_setcolreg(unsigned, unsigned, unsigned, unsigned,
  31                         unsigned, struct fb_info *);
  32static int tcx_blank(int, struct fb_info *);
  33
  34static int tcx_mmap(struct fb_info *, struct vm_area_struct *);
  35static int tcx_ioctl(struct fb_info *, unsigned int, unsigned long);
  36static int tcx_pan_display(struct fb_var_screeninfo *, struct fb_info *);
  37
  38/*
  39 *  Frame buffer operations
  40 */
  41
  42static 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 */
  77struct tcx_tec {
  78        u32 tec_matrix;
  79        u32 tec_clip;
  80        u32 tec_vdc;
  81};
  82
  83struct 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
  99struct bt_regs {
 100        u32 addr;
 101        u32 color_map;
 102        u32 control;
 103        u32 cursor;
 104};
 105
 106#define TCX_MMAP_ENTRIES 14
 107
 108struct 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. */
 125static 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
 144static 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
 154static 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 */
 169static 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 */
 201static int
 202tcx_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
 244static 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
 300static 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
 309static 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
 324static void
 325tcx_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
 345static 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
 365static 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
 478out_dealloc_cmap:
 479        fb_dealloc_cmap(&info->cmap);
 480
 481out_unmap_regs:
 482        tcx_unmap_regs(op, info, par);
 483        framebuffer_release(info);
 484
 485out_err:
 486        return err;
 487}
 488
 489static 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        dev_set_drvdata(&op->dev, NULL);
 502
 503        return 0;
 504}
 505
 506static const struct of_device_id tcx_match[] = {
 507        {
 508                .name = "SUNW,tcx",
 509        },
 510        {},
 511};
 512MODULE_DEVICE_TABLE(of, tcx_match);
 513
 514static struct platform_driver tcx_driver = {
 515        .driver = {
 516                .name = "tcx",
 517                .owner = THIS_MODULE,
 518                .of_match_table = tcx_match,
 519        },
 520        .probe          = tcx_probe,
 521        .remove         = tcx_remove,
 522};
 523
 524static int __init tcx_init(void)
 525{
 526        if (fb_get_options("tcxfb", NULL))
 527                return -ENODEV;
 528
 529        return platform_driver_register(&tcx_driver);
 530}
 531
 532static void __exit tcx_exit(void)
 533{
 534        platform_driver_unregister(&tcx_driver);
 535}
 536
 537module_init(tcx_init);
 538module_exit(tcx_exit);
 539
 540MODULE_DESCRIPTION("framebuffer driver for TCX chipsets");
 541MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
 542MODULE_VERSION("2.0");
 543MODULE_LICENSE("GPL");
 544
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