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   1 /* cg3.c: CGTHREE 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) 1997 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/oplib.h>
  23 #include <asm/prom.h>
  24 #include <asm/of_device.h>
  25 #include <asm/fbio.h>
  26
  27 #include "sbuslib.h"
  28
  29 /*
  30  * Local functions.
  31  */
  32
  33 static int cg3_setcolreg(unsigned, unsigned, unsigned, unsigned,
  34                          unsigned, struct fb_info *);
  35 static int cg3_blank(int, struct fb_info *);
  36
  37 static int cg3_mmap(struct fb_info *, struct vm_area_struct *);
  38 static int cg3_ioctl(struct fb_info *, unsigned int, unsigned long);
  39
  40 /*
  41  *  Frame buffer operations
  42  */
  43
  44 static struct fb_ops cg3_ops = {
  45         .owner                  = THIS_MODULE,
  46         .fb_setcolreg           = cg3_setcolreg,
  47         .fb_blank               = cg3_blank,
  48         .fb_fillrect            = cfb_fillrect,
  49         .fb_copyarea            = cfb_copyarea,
  50         .fb_imageblit           = cfb_imageblit,
  51         .fb_mmap                = cg3_mmap,
  52         .fb_ioctl               = cg3_ioctl,
  53 #ifdef CONFIG_COMPAT
  54         .fb_compat_ioctl        = sbusfb_compat_ioctl,
  55 #endif
  56 };
  57
  58
  59 /* Control Register Constants */
  60 #define CG3_CR_ENABLE_INTS      0x80
  61 #define CG3_CR_ENABLE_VIDEO     0x40
  62 #define CG3_CR_ENABLE_TIMING    0x20
  63 #define CG3_CR_ENABLE_CURCMP    0x10
  64 #define CG3_CR_XTAL_MASK        0x0c
  65 #define CG3_CR_DIVISOR_MASK     0x03
  66
  67 /* Status Register Constants */
  68 #define CG3_SR_PENDING_INT      0x80
  69 #define CG3_SR_RES_MASK         0x70
  70 #define CG3_SR_1152_900_76_A    0x40
  71 #define CG3_SR_1152_900_76_B    0x60
  72 #define CG3_SR_ID_MASK          0x0f
  73 #define CG3_SR_ID_COLOR         0x01
  74 #define CG3_SR_ID_MONO          0x02
  75 #define CG3_SR_ID_MONO_ECL      0x03
  76
  77 enum cg3_type {
  78         CG3_AT_66HZ = 0,
  79         CG3_AT_76HZ,
  80         CG3_RDI
  81 };
  82
  83 struct bt_regs {
  84         u32 addr;
  85         u32 color_map;
  86         u32 control;
  87         u32 cursor;
  88 };
  89
  90 struct cg3_regs {
  91         struct bt_regs  cmap;
  92         u8      control;
  93         u8      status;
  94         u8      cursor_start;
  95         u8      cursor_end;
  96         u8      h_blank_start;
  97         u8      h_blank_end;
  98         u8      h_sync_start;
  99         u8      h_sync_end;
 100         u8      comp_sync_end;
 101         u8      v_blank_start_high;
 102         u8      v_blank_start_low;
 103         u8      v_blank_end;
 104         u8      v_sync_start;
 105         u8      v_sync_end;
 106         u8      xfer_holdoff_start;
 107         u8      xfer_holdoff_end;
 108 };
 109
 110 /* Offset of interesting structures in the OBIO space */
 111 #define CG3_REGS_OFFSET      0x400000UL
 112 #define CG3_RAM_OFFSET       0x800000UL
 113
 114 struct cg3_par {
 115         spinlock_t              lock;
 116         struct cg3_regs         __iomem *regs;
 117         u32                     sw_cmap[((256 * 3) + 3) / 4];
 118
 119         u32                     flags;
 120 #define CG3_FLAG_BLANKED        0x00000001
 121 #define CG3_FLAG_RDI            0x00000002
 122
 123         unsigned long           physbase;
 124         unsigned long           which_io;
 125         unsigned long           fbsize;
 126 };
 127
 128 /**
 129  *      cg3_setcolreg - Optional function. Sets a color register.
 130  *      @regno: boolean, 0 copy local, 1 get_user() function
 131  *      @red: frame buffer colormap structure
 132  *      @green: The green value which can be up to 16 bits wide
 133  *      @blue:  The blue value which can be up to 16 bits wide.
 134  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 135  *      @info: frame buffer info structure
 136  *
 137  * The cg3 palette is loaded with 4 color values at each time
 138  * so you end up with: (rgb)(r), (gb)(rg), (b)(rgb), and so on.
 139  * We keep a sw copy of the hw cmap to assist us in this esoteric
 140  * loading procedure.
 141  */
 142 static int cg3_setcolreg(unsigned regno,
 143                          unsigned red, unsigned green, unsigned blue,
 144                          unsigned transp, struct fb_info *info)
 145 {
 146         struct cg3_par *par = (struct cg3_par *) info->par;
 147         struct bt_regs __iomem *bt = &par->regs->cmap;
 148         unsigned long flags;
 149         u32 *p32;
 150         u8 *p8;
 151         int count;
 152
 153         if (regno >= 256)
 154                 return 1;
 155
 156         red >>= 8;
 157         green >>= 8;
 158         blue >>= 8;
 159
 160         spin_lock_irqsave(&par->lock, flags);
 161
 162         p8 = (u8 *)par->sw_cmap + (regno * 3);
 163         p8[0] = red;
 164         p8[1] = green;
 165         p8[2] = blue;
 166
 167 #define D4M3(x) ((((x)>>2)<<1) + ((x)>>2))      /* (x/4)*3 */
 168 #define D4M4(x) ((x)&~0x3)                      /* (x/4)*4 */
 169
 170         count = 3;
 171         p32 = &par->sw_cmap[D4M3(regno)];
 172         sbus_writel(D4M4(regno), &bt->addr);
 173         while (count--)
 174                 sbus_writel(*p32++, &bt->color_map);
 175
 176 #undef D4M3
 177 #undef D4M4
 178
 179         spin_unlock_irqrestore(&par->lock, flags);
 180
 181         return 0;
 182 }
 183
 184 /**
 185  *      cg3_blank - Optional function.  Blanks the display.
 186  *      @blank_mode: the blank mode we want.
 187  *      @info: frame buffer structure that represents a single frame buffer
 188  */
 189 static int cg3_blank(int blank, struct fb_info *info)
 190 {
 191         struct cg3_par *par = (struct cg3_par *) info->par;
 192         struct cg3_regs __iomem *regs = par->regs;
 193         unsigned long flags;
 194         u8 val;
 195
 196         spin_lock_irqsave(&par->lock, flags);
 197
 198         switch (blank) {
 199         case FB_BLANK_UNBLANK: /* Unblanking */
 200                 val = sbus_readb(&regs->control);
 201                 val |= CG3_CR_ENABLE_VIDEO;
 202                 sbus_writeb(val, &regs->control);
 203                 par->flags &= ~CG3_FLAG_BLANKED;
 204                 break;
 205
 206         case FB_BLANK_NORMAL: /* Normal blanking */
 207         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
 208         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
 209         case FB_BLANK_POWERDOWN: /* Poweroff */
 210                 val = sbus_readb(&regs->control);
 211                 val &= ~CG3_CR_ENABLE_VIDEO;
 212                 sbus_writeb(val, &regs->control);
 213                 par->flags |= CG3_FLAG_BLANKED;
 214                 break;
 215         }
 216
 217         spin_unlock_irqrestore(&par->lock, flags);
 218
 219         return 0;
 220 }
 221
 222 static struct sbus_mmap_map cg3_mmap_map[] = {
 223         {
 224                 .voff   = CG3_MMAP_OFFSET,
 225                 .poff   = CG3_RAM_OFFSET,
 226                 .size   = SBUS_MMAP_FBSIZE(1)
 227         },
 228         { .size = 0 }
 229 };
 230
 231 static int cg3_mmap(struct fb_info *info, struct vm_area_struct *vma)
 232 {
 233         struct cg3_par *par = (struct cg3_par *)info->par;
 234
 235         return sbusfb_mmap_helper(cg3_mmap_map,
 236                                   par->physbase, par->fbsize,
 237                                   par->which_io,
 238                                   vma);
 239 }
 240
 241 static int cg3_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
 242 {
 243         struct cg3_par *par = (struct cg3_par *) info->par;
 244
 245         return sbusfb_ioctl_helper(cmd, arg, info,
 246                                    FBTYPE_SUN3COLOR, 8, par->fbsize);
 247 }
 248
 249 /*
 250  *  Initialisation
 251  */
 252
 253 static void __devinit cg3_init_fix(struct fb_info *info, int linebytes,
 254                                    struct device_node *dp)
 255 {
 256         strlcpy(info->fix.id, dp->name, sizeof(info->fix.id));
 257
 258         info->fix.type = FB_TYPE_PACKED_PIXELS;
 259         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 260
 261         info->fix.line_length = linebytes;
 262
 263         info->fix.accel = FB_ACCEL_SUN_CGTHREE;
 264 }
 265
 266 static void __devinit cg3_rdi_maybe_fixup_var(struct fb_var_screeninfo *var,
 267                                               struct device_node *dp)
 268 {
 269         const char *params;
 270         char *p;
 271         int ww, hh;
 272
 273         params = of_get_property(dp, "params", NULL);
 274         if (params) {
 275                 ww = simple_strtoul(params, &p, 10);
 276                 if (ww && *p == 'x') {
 277                         hh = simple_strtoul(p + 1, &p, 10);
 278                         if (hh && *p == '-') {
 279                                 if (var->xres != ww ||
 280                                     var->yres != hh) {
 281                                         var->xres = var->xres_virtual = ww;
 282                                         var->yres = var->yres_virtual = hh;
 283                                 }
 284                         }
 285                 }
 286         }
 287 }
 288
 289 static u8 cg3regvals_66hz[] __devinitdata = {   /* 1152 x 900, 66 Hz */
 290         0x14, 0xbb,     0x15, 0x2b,     0x16, 0x04,     0x17, 0x14,
 291         0x18, 0xae,     0x19, 0x03,     0x1a, 0xa8,     0x1b, 0x24,
 292         0x1c, 0x01,     0x1d, 0x05,     0x1e, 0xff,     0x1f, 0x01,
 293         0x10, 0x20,     0
 294 };
 295
 296 static u8 cg3regvals_76hz[] __devinitdata = {   /* 1152 x 900, 76 Hz */
 297         0x14, 0xb7,     0x15, 0x27,     0x16, 0x03,     0x17, 0x0f,
 298         0x18, 0xae,     0x19, 0x03,     0x1a, 0xae,     0x1b, 0x2a,
 299         0x1c, 0x01,     0x1d, 0x09,     0x1e, 0xff,     0x1f, 0x01,
 300         0x10, 0x24,     0
 301 };
 302
 303 static u8 cg3regvals_rdi[] __devinitdata = {    /* 640 x 480, cgRDI */
 304         0x14, 0x70,     0x15, 0x20,     0x16, 0x08,     0x17, 0x10,
 305         0x18, 0x06,     0x19, 0x02,     0x1a, 0x31,     0x1b, 0x51,
 306         0x1c, 0x06,     0x1d, 0x0c,     0x1e, 0xff,     0x1f, 0x01,
 307         0x10, 0x22,     0
 308 };
 309
 310 static u8 *cg3_regvals[] __devinitdata = {
 311         cg3regvals_66hz, cg3regvals_76hz, cg3regvals_rdi
 312 };
 313
 314 static u_char cg3_dacvals[] __devinitdata = {
 315         4, 0xff,        5, 0x00,        6, 0x70,        7, 0x00,        0
 316 };
 317
 318 static int __devinit cg3_do_default_mode(struct cg3_par *par)
 319 {
 320         enum cg3_type type;
 321         u8 *p;
 322
 323         if (par->flags & CG3_FLAG_RDI)
 324                 type = CG3_RDI;
 325         else {
 326                 u8 status = sbus_readb(&par->regs->status), mon;
 327                 if ((status & CG3_SR_ID_MASK) == CG3_SR_ID_COLOR) {
 328                         mon = status & CG3_SR_RES_MASK;
 329                         if (mon == CG3_SR_1152_900_76_A ||
 330                             mon == CG3_SR_1152_900_76_B)
 331                                 type = CG3_AT_76HZ;
 332                         else
 333                                 type = CG3_AT_66HZ;
 334                 } else {
 335                         printk(KERN_ERR "cgthree: can't handle SR %02x\n",
 336                                status);
 337                         return -EINVAL;
 338                 }
 339         }
 340
 341         for (p = cg3_regvals[type]; *p; p += 2) {
 342                 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];
 343                 sbus_writeb(p[1], regp);
 344         }
 345         for (p = cg3_dacvals; *p; p += 2) {
 346                 u8 __iomem *regp;
 347
 348                 regp = (u8 __iomem *)&par->regs->cmap.addr;
 349                 sbus_writeb(p[0], regp);
 350                 regp = (u8 __iomem *)&par->regs->cmap.control;
 351                 sbus_writeb(p[1], regp);
 352         }
 353         return 0;
 354 }
 355
 356 static int __devinit cg3_probe(struct of_device *op,
 357                                const struct of_device_id *match)
 358 {
 359         struct device_node *dp = op->node;
 360         struct fb_info *info;
 361         struct cg3_par *par;
 362         int linebytes, err;
 363
 364         info = framebuffer_alloc(sizeof(struct cg3_par), &op->dev);
 365
 366         err = -ENOMEM;
 367         if (!info)
 368                 goto out_err;
 369         par = info->par;
 370
 371         spin_lock_init(&par->lock);
 372
 373         par->physbase = op->resource[0].start;
 374         par->which_io = op->resource[0].flags & IORESOURCE_BITS;
 375
 376         sbusfb_fill_var(&info->var, dp->node, 8);
 377         info->var.red.length = 8;
 378         info->var.green.length = 8;
 379         info->var.blue.length = 8;
 380         if (!strcmp(dp->name, "cgRDI"))
 381                 par->flags |= CG3_FLAG_RDI;
 382         if (par->flags & CG3_FLAG_RDI)
 383                 cg3_rdi_maybe_fixup_var(&info->var, dp);
 384
 385         linebytes = of_getintprop_default(dp, "linebytes",
 386                                           info->var.xres);
 387         par->fbsize = PAGE_ALIGN(linebytes * info->var.yres);
 388
 389         par->regs = of_ioremap(&op->resource[0], CG3_REGS_OFFSET,
 390                                sizeof(struct cg3_regs), "cg3 regs");
 391         if (!par->regs)
 392                 goto out_release_fb;
 393
 394         info->flags = FBINFO_DEFAULT;
 395         info->fbops = &cg3_ops;
 396         info->screen_base = of_ioremap(&op->resource[0], CG3_RAM_OFFSET,
 397                                        par->fbsize, "cg3 ram");
 398         if (!info->screen_base)
 399                 goto out_unmap_regs;
 400
 401         cg3_blank(0, info);
 402
 403         if (!of_find_property(dp, "width", NULL)) {
 404                 err = cg3_do_default_mode(par);
 405                 if (err)
 406                         goto out_unmap_screen;
 407         }
 408
 409         if (fb_alloc_cmap(&info->cmap, 256, 0))
 410                 goto out_unmap_screen;
 411
 412         fb_set_cmap(&info->cmap, info);
 413
 414         cg3_init_fix(info, linebytes, dp);
 415
 416         err = register_framebuffer(info);
 417         if (err < 0)
 418                 goto out_dealloc_cmap;
 419
 420         dev_set_drvdata(&op->dev, info);
 421
 422         printk("%s: cg3 at %lx:%lx\n",
 423                dp->full_name, par->which_io, par->physbase);
 424
 425         return 0;
 426
 427 out_dealloc_cmap:
 428         fb_dealloc_cmap(&info->cmap);
 429
 430 out_unmap_screen:
 431         of_iounmap(&op->resource[0], info->screen_base, par->fbsize);
 432
 433 out_unmap_regs:
 434         of_iounmap(&op->resource[0], par->regs, sizeof(struct cg3_regs));
 435
 436 out_release_fb:
 437         framebuffer_release(info);
 438
 439 out_err:
 440         return err;
 441 }
 442
 443 static int __devexit cg3_remove(struct of_device *op)
 444 {
 445         struct fb_info *info = dev_get_drvdata(&op->dev);
 446         struct cg3_par *par = info->par;
 447
 448         unregister_framebuffer(info);
 449         fb_dealloc_cmap(&info->cmap);
 450
 451         of_iounmap(&op->resource[0], par->regs, sizeof(struct cg3_regs));
 452         of_iounmap(&op->resource[0], info->screen_base, par->fbsize);
 453
 454         framebuffer_release(info);
 455
 456         dev_set_drvdata(&op->dev, NULL);
 457
 458         return 0;
 459 }
 460
 461 static struct of_device_id cg3_match[] = {
 462         {
 463                 .name = "cgthree",
 464         },
 465         {
 466                 .name = "cgRDI",
 467         },
 468         {},
 469 };
 470 MODULE_DEVICE_TABLE(of, cg3_match);
 471
 472 static struct of_platform_driver cg3_driver = {
 473         .name           = "cg3",
 474         .match_table    = cg3_match,
 475         .probe          = cg3_probe,
 476         .remove         = __devexit_p(cg3_remove),
 477 };
 478
 479 static int __init cg3_init(void)
 480 {
 481         if (fb_get_options("cg3fb", NULL))
 482                 return -ENODEV;
 483
 484         return of_register_driver(&cg3_driver, &of_bus_type);
 485 }
 486
 487 static void __exit cg3_exit(void)
 488 {
 489         of_unregister_driver(&cg3_driver);
 490 }
 491
 492 module_init(cg3_init);
 493 module_exit(cg3_exit);
 494
 495 MODULE_DESCRIPTION("framebuffer driver for CGthree chipsets");
 496 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
 497 MODULE_VERSION("2.0");
 498 MODULE_LICENSE("GPL");