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