drivers/video/cg3.c

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