linux/drivers/video/fbdev/cg14.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/* cg14.c: CGFOURTEEN frame buffer driver
   3 *
   4 * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
   5 * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz)
   6 * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
   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/uaccess.h>
  20#include <linux/of_device.h>
  21
  22#include <asm/io.h>
  23#include <asm/fbio.h>
  24
  25#include "sbuslib.h"
  26
  27/*
  28 * Local functions.
  29 */
  30
  31static int cg14_setcolreg(unsigned, unsigned, unsigned, unsigned,
  32                         unsigned, struct fb_info *);
  33
  34static int cg14_mmap(struct fb_info *, struct vm_area_struct *);
  35static int cg14_ioctl(struct fb_info *, unsigned int, unsigned long);
  36static int cg14_pan_display(struct fb_var_screeninfo *, struct fb_info *);
  37
  38/*
  39 *  Frame buffer operations
  40 */
  41
  42static const struct fb_ops cg14_ops = {
  43        .owner                  = THIS_MODULE,
  44        .fb_setcolreg           = cg14_setcolreg,
  45        .fb_pan_display         = cg14_pan_display,
  46        .fb_fillrect            = cfb_fillrect,
  47        .fb_copyarea            = cfb_copyarea,
  48        .fb_imageblit           = cfb_imageblit,
  49        .fb_mmap                = cg14_mmap,
  50        .fb_ioctl               = cg14_ioctl,
  51#ifdef CONFIG_COMPAT
  52        .fb_compat_ioctl        = sbusfb_compat_ioctl,
  53#endif
  54};
  55
  56#define CG14_MCR_INTENABLE_SHIFT        7
  57#define CG14_MCR_INTENABLE_MASK         0x80
  58#define CG14_MCR_VIDENABLE_SHIFT        6
  59#define CG14_MCR_VIDENABLE_MASK         0x40
  60#define CG14_MCR_PIXMODE_SHIFT          4
  61#define CG14_MCR_PIXMODE_MASK           0x30
  62#define CG14_MCR_TMR_SHIFT              2
  63#define CG14_MCR_TMR_MASK               0x0c
  64#define CG14_MCR_TMENABLE_SHIFT         1
  65#define CG14_MCR_TMENABLE_MASK          0x02
  66#define CG14_MCR_RESET_SHIFT            0
  67#define CG14_MCR_RESET_MASK             0x01
  68#define CG14_REV_REVISION_SHIFT         4
  69#define CG14_REV_REVISION_MASK          0xf0
  70#define CG14_REV_IMPL_SHIFT             0
  71#define CG14_REV_IMPL_MASK              0x0f
  72#define CG14_VBR_FRAMEBASE_SHIFT        12
  73#define CG14_VBR_FRAMEBASE_MASK         0x00fff000
  74#define CG14_VMCR1_SETUP_SHIFT          0
  75#define CG14_VMCR1_SETUP_MASK           0x000001ff
  76#define CG14_VMCR1_VCONFIG_SHIFT        9
  77#define CG14_VMCR1_VCONFIG_MASK         0x00000e00
  78#define CG14_VMCR2_REFRESH_SHIFT        0
  79#define CG14_VMCR2_REFRESH_MASK         0x00000001
  80#define CG14_VMCR2_TESTROWCNT_SHIFT     1
  81#define CG14_VMCR2_TESTROWCNT_MASK      0x00000002
  82#define CG14_VMCR2_FBCONFIG_SHIFT       2
  83#define CG14_VMCR2_FBCONFIG_MASK        0x0000000c
  84#define CG14_VCR_REFRESHREQ_SHIFT       0
  85#define CG14_VCR_REFRESHREQ_MASK        0x000003ff
  86#define CG14_VCR1_REFRESHENA_SHIFT      10
  87#define CG14_VCR1_REFRESHENA_MASK       0x00000400
  88#define CG14_VCA_CAD_SHIFT              0
  89#define CG14_VCA_CAD_MASK               0x000003ff
  90#define CG14_VCA_VERS_SHIFT             10
  91#define CG14_VCA_VERS_MASK              0x00000c00
  92#define CG14_VCA_RAMSPEED_SHIFT         12
  93#define CG14_VCA_RAMSPEED_MASK          0x00001000
  94#define CG14_VCA_8MB_SHIFT              13
  95#define CG14_VCA_8MB_MASK               0x00002000
  96
  97#define CG14_MCR_PIXMODE_8              0
  98#define CG14_MCR_PIXMODE_16             2
  99#define CG14_MCR_PIXMODE_32             3
 100
 101struct cg14_regs{
 102        u8 mcr; /* Master Control Reg */
 103        u8 ppr; /* Packed Pixel Reg */
 104        u8 tms[2];      /* Test Mode Status Regs */
 105        u8 msr; /* Master Status Reg */
 106        u8 fsr; /* Fault Status Reg */
 107        u8 rev; /* Revision & Impl */
 108        u8 ccr; /* Clock Control Reg */
 109        u32 tmr;        /* Test Mode Read Back */
 110        u8 mod; /* Monitor Operation Data Reg */
 111        u8 acr; /* Aux Control */
 112        u8 xxx0[6];
 113        u16 hct;        /* Hor Counter */
 114        u16 vct;        /* Vert Counter */
 115        u16 hbs;        /* Hor Blank Start */
 116        u16 hbc;        /* Hor Blank Clear */
 117        u16 hss;        /* Hor Sync Start */
 118        u16 hsc;        /* Hor Sync Clear */
 119        u16 csc;        /* Composite Sync Clear */
 120        u16 vbs;        /* Vert Blank Start */
 121        u16 vbc;        /* Vert Blank Clear */
 122        u16 vss;        /* Vert Sync Start */
 123        u16 vsc;        /* Vert Sync Clear */
 124        u16 xcs;
 125        u16 xcc;
 126        u16 fsa;        /* Fault Status Address */
 127        u16 adr;        /* Address Registers */
 128        u8 xxx1[0xce];
 129        u8 pcg[0x100]; /* Pixel Clock Generator */
 130        u32 vbr;        /* Frame Base Row */
 131        u32 vmcr;       /* VBC Master Control */
 132        u32 vcr;        /* VBC refresh */
 133        u32 vca;        /* VBC Config */
 134};
 135
 136#define CG14_CCR_ENABLE 0x04
 137#define CG14_CCR_SELECT 0x02    /* HW/Full screen */
 138
 139struct cg14_cursor {
 140        u32 cpl0[32];   /* Enable plane 0 */
 141        u32 cpl1[32];  /* Color selection plane */
 142        u8 ccr; /* Cursor Control Reg */
 143        u8 xxx0[3];
 144        u16 cursx;      /* Cursor x,y position */
 145        u16 cursy;      /* Cursor x,y position */
 146        u32 color0;
 147        u32 color1;
 148        u32 xxx1[0x1bc];
 149        u32 cpl0i[32];  /* Enable plane 0 autoinc */
 150        u32 cpl1i[32]; /* Color selection autoinc */
 151};
 152
 153struct cg14_dac {
 154        u8 addr;        /* Address Register */
 155        u8 xxx0[255];
 156        u8 glut;        /* Gamma table */
 157        u8 xxx1[255];
 158        u8 select;      /* Register Select */
 159        u8 xxx2[255];
 160        u8 mode;        /* Mode Register */
 161};
 162
 163struct cg14_xlut{
 164        u8 x_xlut [256];
 165        u8 x_xlutd [256];
 166        u8 xxx0[0x600];
 167        u8 x_xlut_inc [256];
 168        u8 x_xlutd_inc [256];
 169};
 170
 171/* Color look up table (clut) */
 172/* Each one of these arrays hold the color lookup table (for 256
 173 * colors) for each MDI page (I assume then there should be 4 MDI
 174 * pages, I still wonder what they are.  I have seen NeXTStep split
 175 * the screen in four parts, while operating in 24 bits mode.  Each
 176 * integer holds 4 values: alpha value (transparency channel, thanks
 177 * go to John Stone (johns@umr.edu) from OpenBSD), red, green and blue
 178 *
 179 * I currently use the clut instead of the Xlut
 180 */
 181struct cg14_clut {
 182        u32 c_clut [256];
 183        u32 c_clutd [256];    /* i wonder what the 'd' is for */
 184        u32 c_clut_inc [256];
 185        u32 c_clutd_inc [256];
 186};
 187
 188#define CG14_MMAP_ENTRIES       16
 189
 190struct cg14_par {
 191        spinlock_t              lock;
 192        struct cg14_regs        __iomem *regs;
 193        struct cg14_clut        __iomem *clut;
 194        struct cg14_cursor      __iomem *cursor;
 195
 196        u32                     flags;
 197#define CG14_FLAG_BLANKED       0x00000001
 198
 199        unsigned long           iospace;
 200
 201        struct sbus_mmap_map    mmap_map[CG14_MMAP_ENTRIES];
 202
 203        int                     mode;
 204        int                     ramsize;
 205};
 206
 207static void __cg14_reset(struct cg14_par *par)
 208{
 209        struct cg14_regs __iomem *regs = par->regs;
 210        u8 val;
 211
 212        val = sbus_readb(&regs->mcr);
 213        val &= ~(CG14_MCR_PIXMODE_MASK);
 214        sbus_writeb(val, &regs->mcr);
 215}
 216
 217static int cg14_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
 218{
 219        struct cg14_par *par = (struct cg14_par *) info->par;
 220        unsigned long flags;
 221
 222        /* We just use this to catch switches out of
 223         * graphics mode.
 224         */
 225        spin_lock_irqsave(&par->lock, flags);
 226        __cg14_reset(par);
 227        spin_unlock_irqrestore(&par->lock, flags);
 228
 229        if (var->xoffset || var->yoffset || var->vmode)
 230                return -EINVAL;
 231        return 0;
 232}
 233
 234/**
 235 *      cg14_setcolreg - Optional function. Sets a color register.
 236 *      @regno: boolean, 0 copy local, 1 get_user() function
 237 *      @red: frame buffer colormap structure
 238 *      @green: The green value which can be up to 16 bits wide
 239 *      @blue:  The blue value which can be up to 16 bits wide.
 240 *      @transp: If supported the alpha value which can be up to 16 bits wide.
 241 *      @info: frame buffer info structure
 242 */
 243static int cg14_setcolreg(unsigned regno,
 244                          unsigned red, unsigned green, unsigned blue,
 245                          unsigned transp, struct fb_info *info)
 246{
 247        struct cg14_par *par = (struct cg14_par *) info->par;
 248        struct cg14_clut __iomem *clut = par->clut;
 249        unsigned long flags;
 250        u32 val;
 251
 252        if (regno >= 256)
 253                return 1;
 254
 255        red >>= 8;
 256        green >>= 8;
 257        blue >>= 8;
 258        val = (red | (green << 8) | (blue << 16));
 259
 260        spin_lock_irqsave(&par->lock, flags);
 261        sbus_writel(val, &clut->c_clut[regno]);
 262        spin_unlock_irqrestore(&par->lock, flags);
 263
 264        return 0;
 265}
 266
 267static int cg14_mmap(struct fb_info *info, struct vm_area_struct *vma)
 268{
 269        struct cg14_par *par = (struct cg14_par *) info->par;
 270
 271        return sbusfb_mmap_helper(par->mmap_map,
 272                                  info->fix.smem_start, info->fix.smem_len,
 273                                  par->iospace, vma);
 274}
 275
 276static int cg14_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
 277{
 278        struct cg14_par *par = (struct cg14_par *) info->par;
 279        struct cg14_regs __iomem *regs = par->regs;
 280        struct mdi_cfginfo kmdi, __user *mdii;
 281        unsigned long flags;
 282        int cur_mode, mode, ret = 0;
 283
 284        switch (cmd) {
 285        case MDI_RESET:
 286                spin_lock_irqsave(&par->lock, flags);
 287                __cg14_reset(par);
 288                spin_unlock_irqrestore(&par->lock, flags);
 289                break;
 290
 291        case MDI_GET_CFGINFO:
 292                memset(&kmdi, 0, sizeof(kmdi));
 293
 294                spin_lock_irqsave(&par->lock, flags);
 295                kmdi.mdi_type = FBTYPE_MDICOLOR;
 296                kmdi.mdi_height = info->var.yres;
 297                kmdi.mdi_width = info->var.xres;
 298                kmdi.mdi_mode = par->mode;
 299                kmdi.mdi_pixfreq = 72; /* FIXME */
 300                kmdi.mdi_size = par->ramsize;
 301                spin_unlock_irqrestore(&par->lock, flags);
 302
 303                mdii = (struct mdi_cfginfo __user *) arg;
 304                if (copy_to_user(mdii, &kmdi, sizeof(kmdi)))
 305                        ret = -EFAULT;
 306                break;
 307
 308        case MDI_SET_PIXELMODE:
 309                if (get_user(mode, (int __user *) arg)) {
 310                        ret = -EFAULT;
 311                        break;
 312                }
 313
 314                spin_lock_irqsave(&par->lock, flags);
 315                cur_mode = sbus_readb(&regs->mcr);
 316                cur_mode &= ~CG14_MCR_PIXMODE_MASK;
 317                switch(mode) {
 318                case MDI_32_PIX:
 319                        cur_mode |= (CG14_MCR_PIXMODE_32 <<
 320                                     CG14_MCR_PIXMODE_SHIFT);
 321                        break;
 322
 323                case MDI_16_PIX:
 324                        cur_mode |= (CG14_MCR_PIXMODE_16 <<
 325                                     CG14_MCR_PIXMODE_SHIFT);
 326                        break;
 327
 328                case MDI_8_PIX:
 329                        break;
 330
 331                default:
 332                        ret = -ENOSYS;
 333                        break;
 334                }
 335                if (!ret) {
 336                        sbus_writeb(cur_mode, &regs->mcr);
 337                        par->mode = mode;
 338                }
 339                spin_unlock_irqrestore(&par->lock, flags);
 340                break;
 341
 342        default:
 343                ret = sbusfb_ioctl_helper(cmd, arg, info,
 344                                          FBTYPE_MDICOLOR, 8,
 345                                          info->fix.smem_len);
 346                break;
 347        }
 348
 349        return ret;
 350}
 351
 352/*
 353 *  Initialisation
 354 */
 355
 356static void cg14_init_fix(struct fb_info *info, int linebytes,
 357                          struct device_node *dp)
 358{
 359        snprintf(info->fix.id, sizeof(info->fix.id), "%pOFn", dp);
 360
 361        info->fix.type = FB_TYPE_PACKED_PIXELS;
 362        info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 363
 364        info->fix.line_length = linebytes;
 365
 366        info->fix.accel = FB_ACCEL_SUN_CG14;
 367}
 368
 369static struct sbus_mmap_map __cg14_mmap_map[CG14_MMAP_ENTRIES] = {
 370        {
 371                .voff   = CG14_REGS,
 372                .poff   = 0x80000000,
 373                .size   = 0x1000
 374        },
 375        {
 376                .voff   = CG14_XLUT,
 377                .poff   = 0x80003000,
 378                .size   = 0x1000
 379        },
 380        {
 381                .voff   = CG14_CLUT1,
 382                .poff   = 0x80004000,
 383                .size   = 0x1000
 384        },
 385        {
 386                .voff   = CG14_CLUT2,
 387                .poff   = 0x80005000,
 388                .size   = 0x1000
 389        },
 390        {
 391                .voff   = CG14_CLUT3,
 392                .poff   = 0x80006000,
 393                .size   = 0x1000
 394        },
 395        {
 396                .voff   = CG3_MMAP_OFFSET - 0x7000,
 397                .poff   = 0x80000000,
 398                .size   = 0x7000
 399        },
 400        {
 401                .voff   = CG3_MMAP_OFFSET,
 402                .poff   = 0x00000000,
 403                .size   = SBUS_MMAP_FBSIZE(1)
 404        },
 405        {
 406                .voff   = MDI_CURSOR_MAP,
 407                .poff   = 0x80001000,
 408                .size   = 0x1000
 409        },
 410        {
 411                .voff   = MDI_CHUNKY_BGR_MAP,
 412                .poff   = 0x01000000,
 413                .size   = 0x400000
 414        },
 415        {
 416                .voff   = MDI_PLANAR_X16_MAP,
 417                .poff   = 0x02000000,
 418                .size   = 0x200000
 419        },
 420        {
 421                .voff   = MDI_PLANAR_C16_MAP,
 422                .poff   = 0x02800000,
 423                .size   = 0x200000
 424        },
 425        {
 426                .voff   = MDI_PLANAR_X32_MAP,
 427                .poff   = 0x03000000,
 428                .size   = 0x100000
 429        },
 430        {
 431                .voff   = MDI_PLANAR_B32_MAP,
 432                .poff   = 0x03400000,
 433                .size   = 0x100000
 434        },
 435        {
 436                .voff   = MDI_PLANAR_G32_MAP,
 437                .poff   = 0x03800000,
 438                .size   = 0x100000
 439        },
 440        {
 441                .voff   = MDI_PLANAR_R32_MAP,
 442                .poff   = 0x03c00000,
 443                .size   = 0x100000
 444        },
 445        { .size = 0 }
 446};
 447
 448static void cg14_unmap_regs(struct platform_device *op, struct fb_info *info,
 449                            struct cg14_par *par)
 450{
 451        if (par->regs)
 452                of_iounmap(&op->resource[0],
 453                           par->regs, sizeof(struct cg14_regs));
 454        if (par->clut)
 455                of_iounmap(&op->resource[0],
 456                           par->clut, sizeof(struct cg14_clut));
 457        if (par->cursor)
 458                of_iounmap(&op->resource[0],
 459                           par->cursor, sizeof(struct cg14_cursor));
 460        if (info->screen_base)
 461                of_iounmap(&op->resource[1],
 462                           info->screen_base, info->fix.smem_len);
 463}
 464
 465static int cg14_probe(struct platform_device *op)
 466{
 467        struct device_node *dp = op->dev.of_node;
 468        struct fb_info *info;
 469        struct cg14_par *par;
 470        int is_8mb, linebytes, i, err;
 471
 472        info = framebuffer_alloc(sizeof(struct cg14_par), &op->dev);
 473
 474        err = -ENOMEM;
 475        if (!info)
 476                goto out_err;
 477        par = info->par;
 478
 479        spin_lock_init(&par->lock);
 480
 481        sbusfb_fill_var(&info->var, dp, 8);
 482        info->var.red.length = 8;
 483        info->var.green.length = 8;
 484        info->var.blue.length = 8;
 485
 486        linebytes = of_getintprop_default(dp, "linebytes",
 487                                          info->var.xres);
 488        info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
 489
 490        if (of_node_name_eq(dp->parent, "sbus") ||
 491            of_node_name_eq(dp->parent, "sbi")) {
 492                info->fix.smem_start = op->resource[0].start;
 493                par->iospace = op->resource[0].flags & IORESOURCE_BITS;
 494        } else {
 495                info->fix.smem_start = op->resource[1].start;
 496                par->iospace = op->resource[0].flags & IORESOURCE_BITS;
 497        }
 498
 499        par->regs = of_ioremap(&op->resource[0], 0,
 500                               sizeof(struct cg14_regs), "cg14 regs");
 501        par->clut = of_ioremap(&op->resource[0], CG14_CLUT1,
 502                               sizeof(struct cg14_clut), "cg14 clut");
 503        par->cursor = of_ioremap(&op->resource[0], CG14_CURSORREGS,
 504                                 sizeof(struct cg14_cursor), "cg14 cursor");
 505
 506        info->screen_base = of_ioremap(&op->resource[1], 0,
 507                                       info->fix.smem_len, "cg14 ram");
 508
 509        if (!par->regs || !par->clut || !par->cursor || !info->screen_base)
 510                goto out_unmap_regs;
 511
 512        is_8mb = (resource_size(&op->resource[1]) == (8 * 1024 * 1024));
 513
 514        BUILD_BUG_ON(sizeof(par->mmap_map) != sizeof(__cg14_mmap_map));
 515                
 516        memcpy(&par->mmap_map, &__cg14_mmap_map, sizeof(par->mmap_map));
 517
 518        for (i = 0; i < CG14_MMAP_ENTRIES; i++) {
 519                struct sbus_mmap_map *map = &par->mmap_map[i];
 520
 521                if (!map->size)
 522                        break;
 523                if (map->poff & 0x80000000)
 524                        map->poff = (map->poff & 0x7fffffff) +
 525                                (op->resource[0].start -
 526                                 op->resource[1].start);
 527                if (is_8mb &&
 528                    map->size >= 0x100000 &&
 529                    map->size <= 0x400000)
 530                        map->size *= 2;
 531        }
 532
 533        par->mode = MDI_8_PIX;
 534        par->ramsize = (is_8mb ? 0x800000 : 0x400000);
 535
 536        info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
 537        info->fbops = &cg14_ops;
 538
 539        __cg14_reset(par);
 540
 541        if (fb_alloc_cmap(&info->cmap, 256, 0))
 542                goto out_unmap_regs;
 543
 544        fb_set_cmap(&info->cmap, info);
 545
 546        cg14_init_fix(info, linebytes, dp);
 547
 548        err = register_framebuffer(info);
 549        if (err < 0)
 550                goto out_dealloc_cmap;
 551
 552        dev_set_drvdata(&op->dev, info);
 553
 554        printk(KERN_INFO "%pOF: cgfourteen at %lx:%lx, %dMB\n",
 555               dp,
 556               par->iospace, info->fix.smem_start,
 557               par->ramsize >> 20);
 558
 559        return 0;
 560
 561out_dealloc_cmap:
 562        fb_dealloc_cmap(&info->cmap);
 563
 564out_unmap_regs:
 565        cg14_unmap_regs(op, info, par);
 566        framebuffer_release(info);
 567
 568out_err:
 569        return err;
 570}
 571
 572static int cg14_remove(struct platform_device *op)
 573{
 574        struct fb_info *info = dev_get_drvdata(&op->dev);
 575        struct cg14_par *par = info->par;
 576
 577        unregister_framebuffer(info);
 578        fb_dealloc_cmap(&info->cmap);
 579
 580        cg14_unmap_regs(op, info, par);
 581
 582        framebuffer_release(info);
 583
 584        return 0;
 585}
 586
 587static const struct of_device_id cg14_match[] = {
 588        {
 589                .name = "cgfourteen",
 590        },
 591        {},
 592};
 593MODULE_DEVICE_TABLE(of, cg14_match);
 594
 595static struct platform_driver cg14_driver = {
 596        .driver = {
 597                .name = "cg14",
 598                .of_match_table = cg14_match,
 599        },
 600        .probe          = cg14_probe,
 601        .remove         = cg14_remove,
 602};
 603
 604static int __init cg14_init(void)
 605{
 606        if (fb_get_options("cg14fb", NULL))
 607                return -ENODEV;
 608
 609        return platform_driver_register(&cg14_driver);
 610}
 611
 612static void __exit cg14_exit(void)
 613{
 614        platform_driver_unregister(&cg14_driver);
 615}
 616
 617module_init(cg14_init);
 618module_exit(cg14_exit);
 619
 620MODULE_DESCRIPTION("framebuffer driver for CGfourteen chipsets");
 621MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
 622MODULE_VERSION("2.0");
 623MODULE_LICENSE("GPL");
 624