drivers/video/amba-clcd.c

   1 /*
   2  *  linux/drivers/video/amba-clcd.c
   3  *
   4  * Copyright (C) 2001 ARM Limited, by David A Rusling
   5  * Updated to 2.5, Deep Blue Solutions Ltd.
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file COPYING in the main directory of this archive
   9  * for more details.
  10  *
  11  *  ARM PrimeCell PL110 Color LCD Controller
  12  */
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/errno.h>
  16 #include <linux/string.h>
  17 #include <linux/slab.h>
  18 #include <linux/delay.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/memblock.h>
  21 #include <linux/mm.h>
  22 #include <linux/of.h>
  23 #include <linux/fb.h>
  24 #include <linux/init.h>
  25 #include <linux/ioport.h>
  26 #include <linux/list.h>
  27 #include <linux/amba/bus.h>
  28 #include <linux/amba/clcd.h>
  29 #include <linux/clk.h>
  30 #include <linux/hardirq.h>
  31
  32 #include <asm/sizes.h>
  33
  34 #define to_clcd(info)   container_of(info, struct clcd_fb, fb)
  35
  36 #ifdef CONFIG_ARM
  37 #define clcdfb_dma_alloc        dma_alloc_writecombine
  38 #define clcdfb_dma_free         dma_free_writecombine
  39 #define clcdfb_dma_mmap         dma_mmap_writecombine
  40 #else
  41 #define clcdfb_dma_alloc        dma_alloc_coherent
  42 #define clcdfb_dma_free         dma_free_coherent
  43 #define clcdfb_dma_mmap         dma_mmap_coherent
  44 #endif
  45
  46 /* This is limited to 16 characters when displayed by X startup */
  47 static const char *clcd_name = "CLCD FB";
  48 static char *def_mode;
  49 module_param_named(mode, def_mode, charp, 0);
  50
  51 /*
  52  * Unfortunately, the enable/disable functions may be called either from
  53  * process or IRQ context, and we _need_ to delay.  This is _not_ good.
  54  */
  55 static inline void clcdfb_sleep(unsigned int ms)
  56 {
  57         if (in_atomic()) {
  58                 mdelay(ms);
  59         } else {
  60                 msleep(ms);
  61         }
  62 }
  63
  64 static inline void clcdfb_set_start(struct clcd_fb *fb)
  65 {
  66         unsigned long ustart = fb->fb.fix.smem_start;
  67         unsigned long lstart;
  68
  69         ustart += fb->fb.var.yoffset * fb->fb.fix.line_length;
  70         lstart = ustart + fb->fb.var.yres * fb->fb.fix.line_length / 2;
  71
  72         writel(ustart, fb->regs + CLCD_UBAS);
  73         writel(lstart, fb->regs + CLCD_LBAS);
  74 }
  75
  76 static void clcdfb_disable(struct clcd_fb *fb)
  77 {
  78         u32 val;
  79
  80         if (fb->board->disable)
  81                 fb->board->disable(fb);
  82
  83         val = readl(fb->regs + fb->off_cntl);
  84         if (val & CNTL_LCDPWR) {
  85                 val &= ~CNTL_LCDPWR;
  86                 writel(val, fb->regs + fb->off_cntl);
  87
  88                 clcdfb_sleep(20);
  89         }
  90         if (val & CNTL_LCDEN) {
  91                 val &= ~CNTL_LCDEN;
  92                 writel(val, fb->regs + fb->off_cntl);
  93         }
  94
  95         /*
  96          * Disable CLCD clock source.
  97          */
  98         if (fb->clk_enabled) {
  99                 fb->clk_enabled = false;
 100                 clk_disable(fb->clk);
 101         }
 102 }
 103
 104 static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
 105 {
 106         /*
 107          * Enable the CLCD clock source.
 108          */
 109         if (!fb->clk_enabled) {
 110                 fb->clk_enabled = true;
 111                 clk_enable(fb->clk);
 112         }
 113
 114         /*
 115          * Bring up by first enabling..
 116          */
 117         cntl |= CNTL_LCDEN;
 118         writel(cntl, fb->regs + fb->off_cntl);
 119
 120         clcdfb_sleep(20);
 121
 122         /*
 123          * and now apply power.
 124          */
 125         cntl |= CNTL_LCDPWR;
 126         writel(cntl, fb->regs + fb->off_cntl);
 127
 128         /*
 129          * finally, enable the interface.
 130          */
 131         if (fb->board->enable)
 132                 fb->board->enable(fb);
 133 }
 134
 135 static int
 136 clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
 137 {
 138         u32 caps;
 139         int ret = 0;
 140
 141         if (fb->panel->caps && fb->board->caps)
 142                 caps = fb->panel->caps & fb->board->caps;
 143         else {
 144                 /* Old way of specifying what can be used */
 145                 caps = fb->panel->cntl & CNTL_BGR ?
 146                         CLCD_CAP_BGR : CLCD_CAP_RGB;
 147                 /* But mask out 444 modes as they weren't supported */
 148                 caps &= ~CLCD_CAP_444;
 149         }
 150
 151         /* Only TFT panels can do RGB888/BGR888 */
 152         if (!(fb->panel->cntl & CNTL_LCDTFT))
 153                 caps &= ~CLCD_CAP_888;
 154
 155         memset(&var->transp, 0, sizeof(var->transp));
 156
 157         var->red.msb_right = 0;
 158         var->green.msb_right = 0;
 159         var->blue.msb_right = 0;
 160
 161         switch (var->bits_per_pixel) {
 162         case 1:
 163         case 2:
 164         case 4:
 165         case 8:
 166                 /* If we can't do 5551, reject */
 167                 caps &= CLCD_CAP_5551;
 168                 if (!caps) {
 169                         ret = -EINVAL;
 170                         break;
 171                 }
 172
 173                 var->red.length         = var->bits_per_pixel;
 174                 var->red.offset         = 0;
 175                 var->green.length       = var->bits_per_pixel;
 176                 var->green.offset       = 0;
 177                 var->blue.length        = var->bits_per_pixel;
 178                 var->blue.offset        = 0;
 179                 break;
 180
 181         case 16:
 182                 /* If we can't do 444, 5551 or 565, reject */
 183                 if (!(caps & (CLCD_CAP_444 | CLCD_CAP_5551 | CLCD_CAP_565))) {
 184                         ret = -EINVAL;
 185                         break;
 186                 }
 187
 188                 /*
 189                  * Green length can be 4, 5 or 6 depending whether
 190                  * we're operating in 444, 5551 or 565 mode.
 191                  */
 192                 if (var->green.length == 4 && caps & CLCD_CAP_444)
 193                         caps &= CLCD_CAP_444;
 194                 if (var->green.length == 5 && caps & CLCD_CAP_5551)
 195                         caps &= CLCD_CAP_5551;
 196                 else if (var->green.length == 6 && caps & CLCD_CAP_565)
 197                         caps &= CLCD_CAP_565;
 198                 else {
 199                         /*
 200                          * PL110 officially only supports RGB555,
 201                          * but may be wired up to allow RGB565.
 202                          */
 203                         if (caps & CLCD_CAP_565) {
 204                                 var->green.length = 6;
 205                                 caps &= CLCD_CAP_565;
 206                         } else if (caps & CLCD_CAP_5551) {
 207                                 var->green.length = 5;
 208                                 caps &= CLCD_CAP_5551;
 209                         } else {
 210                                 var->green.length = 4;
 211                                 caps &= CLCD_CAP_444;
 212                         }
 213                 }
 214
 215                 if (var->green.length >= 5) {
 216                         var->red.length = 5;
 217                         var->blue.length = 5;
 218                 } else {
 219                         var->red.length = 4;
 220                         var->blue.length = 4;
 221                 }
 222                 break;
 223         case 32:
 224                 /* If we can't do 888, reject */
 225                 caps &= CLCD_CAP_888;
 226                 if (!caps) {
 227                         ret = -EINVAL;
 228                         break;
 229                 }
 230
 231                 var->red.length = 8;
 232                 var->green.length = 8;
 233                 var->blue.length = 8;
 234                 break;
 235         default:
 236                 ret = -EINVAL;
 237                 break;
 238         }
 239
 240         /*
 241          * >= 16bpp displays have separate colour component bitfields
 242          * encoded in the pixel data.  Calculate their position from
 243          * the bitfield length defined above.
 244          */
 245         if (ret == 0 && var->bits_per_pixel >= 16) {
 246                 bool bgr, rgb;
 247
 248                 bgr = caps & CLCD_CAP_BGR && var->blue.offset == 0;
 249                 rgb = caps & CLCD_CAP_RGB && var->red.offset == 0;
 250
 251                 if (!bgr && !rgb)
 252                         /*
 253                          * The requested format was not possible, try just
 254                          * our capabilities.  One of BGR or RGB must be
 255                          * supported.
 256                          */
 257                         bgr = caps & CLCD_CAP_BGR;
 258
 259                 if (bgr) {
 260                         var->blue.offset = 0;
 261                         var->green.offset = var->blue.offset + var->blue.length;
 262                         var->red.offset = var->green.offset + var->green.length;
 263                 } else {
 264                         var->red.offset = 0;
 265                         var->green.offset = var->red.offset + var->red.length;
 266                         var->blue.offset = var->green.offset + var->green.length;
 267                 }
 268         }
 269
 270         return ret;
 271 }
 272
 273 static int clcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 274 {
 275         struct clcd_fb *fb = to_clcd(info);
 276         int ret = -EINVAL;
 277
 278         if (fb->board->check)
 279                 ret = fb->board->check(fb, var);
 280
 281         if (ret == 0 &&
 282             var->xres_virtual * var->bits_per_pixel / 8 *
 283             var->yres_virtual > fb->fb.fix.smem_len)
 284                 ret = -EINVAL;
 285
 286         if (ret == 0)
 287                 ret = clcdfb_set_bitfields(fb, var);
 288
 289         return ret;
 290 }
 291
 292 static int clcdfb_set_par(struct fb_info *info)
 293 {
 294         struct clcd_fb *fb = to_clcd(info);
 295         struct clcd_regs regs;
 296
 297         fb->fb.fix.line_length = fb->fb.var.xres_virtual *
 298                                  fb->fb.var.bits_per_pixel / 8;
 299
 300         if (fb->fb.var.bits_per_pixel <= 8)
 301                 fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
 302         else
 303                 fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
 304
 305         fb->board->decode(fb, &regs);
 306
 307         clcdfb_disable(fb);
 308
 309         writel(regs.tim0, fb->regs + CLCD_TIM0);
 310         writel(regs.tim1, fb->regs + CLCD_TIM1);
 311         writel(regs.tim2, fb->regs + CLCD_TIM2);
 312         writel(regs.tim3, fb->regs + CLCD_TIM3);
 313
 314         clcdfb_set_start(fb);
 315
 316         clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000);
 317
 318         fb->clcd_cntl = regs.cntl;
 319
 320         clcdfb_enable(fb, regs.cntl);
 321
 322 #ifdef DEBUG
 323         printk(KERN_INFO
 324                "CLCD: Registers set to\n"
 325                "  %08x %08x %08x %08x\n"
 326                "  %08x %08x %08x %08x\n",
 327                 readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1),
 328                 readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3),
 329                 readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS),
 330                 readl(fb->regs + fb->off_ienb), readl(fb->regs + fb->off_cntl));
 331 #endif
 332
 333         return 0;
 334 }
 335
 336 static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
 337 {
 338         unsigned int mask = (1 << bf->length) - 1;
 339
 340         return (val >> (16 - bf->length) & mask) << bf->offset;
 341 }
 342
 343 /*
 344  *  Set a single color register. The values supplied have a 16 bit
 345  *  magnitude.  Return != 0 for invalid regno.
 346  */
 347 static int
 348 clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
 349                  unsigned int blue, unsigned int transp, struct fb_info *info)
 350 {
 351         struct clcd_fb *fb = to_clcd(info);
 352
 353         if (regno < 16)
 354                 fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
 355                                   convert_bitfield(blue, &fb->fb.var.blue) |
 356                                   convert_bitfield(green, &fb->fb.var.green) |
 357                                   convert_bitfield(red, &fb->fb.var.red);
 358
 359         if (fb->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) {
 360                 int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3);
 361                 u32 val, mask, newval;
 362
 363                 newval  = (red >> 11)  & 0x001f;
 364                 newval |= (green >> 6) & 0x03e0;
 365                 newval |= (blue >> 1)  & 0x7c00;
 366
 367                 /*
 368                  * 3.2.11: if we're configured for big endian
 369                  * byte order, the palette entries are swapped.
 370                  */
 371                 if (fb->clcd_cntl & CNTL_BEBO)
 372                         regno ^= 1;
 373
 374                 if (regno & 1) {
 375                         newval <<= 16;
 376                         mask = 0x0000ffff;
 377                 } else {
 378                         mask = 0xffff0000;
 379                 }
 380
 381                 val = readl(fb->regs + hw_reg) & mask;
 382                 writel(val | newval, fb->regs + hw_reg);
 383         }
 384
 385         return regno > 255;
 386 }
 387
 388 /*
 389  *  Blank the screen if blank_mode != 0, else unblank. If blank == NULL
 390  *  then the caller blanks by setting the CLUT (Color Look Up Table) to all
 391  *  black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
 392  *  to e.g. a video mode which doesn't support it. Implements VESA suspend
 393  *  and powerdown modes on hardware that supports disabling hsync/vsync:
 394  *    blank_mode == 2: suspend vsync
 395  *    blank_mode == 3: suspend hsync
 396  *    blank_mode == 4: powerdown
 397  */
 398 static int clcdfb_blank(int blank_mode, struct fb_info *info)
 399 {
 400         struct clcd_fb *fb = to_clcd(info);
 401
 402         if (blank_mode != 0) {
 403                 clcdfb_disable(fb);
 404         } else {
 405                 clcdfb_enable(fb, fb->clcd_cntl);
 406         }
 407         return 0;
 408 }
 409
 410 int clcdfb_mmap_dma(struct clcd_fb *fb, struct vm_area_struct *vma)
 411 {
 412         return clcdfb_dma_mmap(&fb->dev->dev, vma,
 413                                fb->fb.screen_base,
 414                                fb->fb.fix.smem_start,
 415                                fb->fb.fix.smem_len);
 416 }
 417
 418 int clcdfb_mmap_io(struct clcd_fb *fb, struct vm_area_struct *vma)
 419 {
 420         unsigned long user_count, count, pfn, off;
 421
 422         user_count      = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 423         count           = PAGE_ALIGN(fb->fb.fix.smem_len) >> PAGE_SHIFT;
 424         pfn             = fb->fb.fix.smem_start >> PAGE_SHIFT;
 425         off             = vma->vm_pgoff;
 426
 427         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 428
 429         if (off < count && user_count <= (count - off))
 430                 return remap_pfn_range(vma, vma->vm_start, pfn + off,
 431                                        user_count << PAGE_SHIFT,
 432                                        vma->vm_page_prot);
 433
 434         return -ENXIO;
 435 }
 436
 437 void clcdfb_remove_dma(struct clcd_fb *fb)
 438 {
 439         clcdfb_dma_free(&fb->dev->dev, fb->fb.fix.smem_len,
 440                         fb->fb.screen_base, fb->fb.fix.smem_start);
 441 }
 442
 443 void clcdfb_remove_io(struct clcd_fb *fb)
 444 {
 445         iounmap(fb->fb.screen_base);
 446 }
 447
 448 static int clcdfb_mmap(struct fb_info *info,
 449                        struct vm_area_struct *vma)
 450 {
 451         struct clcd_fb *fb = to_clcd(info);
 452         unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT;
 453         int ret = -EINVAL;
 454
 455         len = info->fix.smem_len;
 456
 457         if (off <= len && vma->vm_end - vma->vm_start <= len - off &&
 458             fb->board->mmap)
 459                 ret = fb->board->mmap(fb, vma);
 460
 461         return ret;
 462 }
 463
 464 static struct fb_ops clcdfb_ops = {
 465         .owner          = THIS_MODULE,
 466         .fb_check_var   = clcdfb_check_var,
 467         .fb_set_par     = clcdfb_set_par,
 468         .fb_setcolreg   = clcdfb_setcolreg,
 469         .fb_blank       = clcdfb_blank,
 470         .fb_fillrect    = cfb_fillrect,
 471         .fb_copyarea    = cfb_copyarea,
 472         .fb_imageblit   = cfb_imageblit,
 473         .fb_mmap        = clcdfb_mmap,
 474 };
 475
 476 static int clcdfb_register(struct clcd_fb *fb)
 477 {
 478         int ret;
 479
 480         /*
 481          * ARM PL111 always has IENB at 0x1c; it's only PL110
 482          * which is reversed on some platforms.
 483          */
 484         if (amba_manf(fb->dev) == 0x41 && amba_part(fb->dev) == 0x111) {
 485                 fb->off_ienb = CLCD_PL111_IENB;
 486                 fb->off_cntl = CLCD_PL111_CNTL;
 487         } else {
 488 #ifdef CONFIG_ARCH_VERSATILE
 489                 fb->off_ienb = CLCD_PL111_IENB;
 490                 fb->off_cntl = CLCD_PL111_CNTL;
 491 #else
 492                 fb->off_ienb = CLCD_PL110_IENB;
 493                 fb->off_cntl = CLCD_PL110_CNTL;
 494 #endif
 495         }
 496
 497         fb->clk = clk_get(&fb->dev->dev, NULL);
 498         if (IS_ERR(fb->clk)) {
 499                 ret = PTR_ERR(fb->clk);
 500                 goto out;
 501         }
 502
 503         ret = clk_prepare(fb->clk);
 504         if (ret)
 505                 goto free_clk;
 506
 507         fb->fb.device           = &fb->dev->dev;
 508
 509         fb->fb.fix.mmio_start   = fb->dev->res.start;
 510         fb->fb.fix.mmio_len     = resource_size(&fb->dev->res);
 511
 512         fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len);
 513         if (!fb->regs) {
 514                 printk(KERN_ERR "CLCD: unable to remap registers\n");
 515                 ret = -ENOMEM;
 516                 goto clk_unprep;
 517         }
 518
 519         fb->fb.fbops            = &clcdfb_ops;
 520         fb->fb.flags            = FBINFO_FLAG_DEFAULT;
 521         fb->fb.pseudo_palette   = fb->cmap;
 522
 523         strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id));
 524         fb->fb.fix.type         = FB_TYPE_PACKED_PIXELS;
 525         fb->fb.fix.type_aux     = 0;
 526         fb->fb.fix.xpanstep     = 0;
 527         fb->fb.fix.ypanstep     = 0;
 528         fb->fb.fix.ywrapstep    = 0;
 529         fb->fb.fix.accel        = FB_ACCEL_NONE;
 530
 531         fb->fb.var.xres         = fb->panel->mode.xres;
 532         fb->fb.var.yres         = fb->panel->mode.yres;
 533         fb->fb.var.xres_virtual = fb->panel->mode.xres;
 534         fb->fb.var.yres_virtual = fb->panel->mode.yres;
 535         fb->fb.var.bits_per_pixel = fb->panel->bpp;
 536         fb->fb.var.grayscale    = fb->panel->grayscale;
 537         fb->fb.var.pixclock     = fb->panel->mode.pixclock;
 538         fb->fb.var.left_margin  = fb->panel->mode.left_margin;
 539         fb->fb.var.right_margin = fb->panel->mode.right_margin;
 540         fb->fb.var.upper_margin = fb->panel->mode.upper_margin;
 541         fb->fb.var.lower_margin = fb->panel->mode.lower_margin;
 542         fb->fb.var.hsync_len    = fb->panel->mode.hsync_len;
 543         fb->fb.var.vsync_len    = fb->panel->mode.vsync_len;
 544         fb->fb.var.sync         = fb->panel->mode.sync;
 545         fb->fb.var.vmode        = fb->panel->mode.vmode;
 546         fb->fb.var.activate     = FB_ACTIVATE_NOW;
 547         fb->fb.var.nonstd       = 0;
 548         fb->fb.var.height       = fb->panel->height;
 549         fb->fb.var.width        = fb->panel->width;
 550         fb->fb.var.accel_flags  = 0;
 551
 552         fb->fb.monspecs.hfmin   = 0;
 553         fb->fb.monspecs.hfmax   = 100000;
 554         fb->fb.monspecs.vfmin   = 0;
 555         fb->fb.monspecs.vfmax   = 400;
 556         fb->fb.monspecs.dclkmin = 1000000;
 557         fb->fb.monspecs.dclkmax = 100000000;
 558
 559         /*
 560          * Make sure that the bitfields are set appropriately.
 561          */
 562         clcdfb_set_bitfields(fb, &fb->fb.var);
 563
 564         /*
 565          * Allocate colourmap.
 566          */
 567         ret = fb_alloc_cmap(&fb->fb.cmap, 256, 0);
 568         if (ret)
 569                 goto unmap;
 570
 571         /*
 572          * Ensure interrupts are disabled.
 573          */
 574         writel(0, fb->regs + fb->off_ienb);
 575
 576         fb_set_var(&fb->fb, &fb->fb.var);
 577
 578         dev_info(&fb->dev->dev, "%s hardware, %s display\n",
 579                  fb->board->name, fb->panel->mode.name);
 580
 581         ret = register_framebuffer(&fb->fb);
 582         if (ret == 0)
 583                 goto out;
 584
 585         printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret);
 586
 587         fb_dealloc_cmap(&fb->fb.cmap);
 588  unmap:
 589         iounmap(fb->regs);
 590  clk_unprep:
 591         clk_unprepare(fb->clk);
 592  free_clk:
 593         clk_put(fb->clk);
 594  out:
 595         return ret;
 596 }
 597
 598 struct string_lookup {
 599         const char *string;
 600         const u32       val;
 601 };
 602
 603 static struct string_lookup vmode_lookups[] = {
 604         { "FB_VMODE_NONINTERLACED", FB_VMODE_NONINTERLACED},
 605         { "FB_VMODE_INTERLACED",    FB_VMODE_INTERLACED},
 606         { "FB_VMODE_DOUBLE",        FB_VMODE_DOUBLE},
 607         { "FB_VMODE_ODD_FLD_FIRST", FB_VMODE_ODD_FLD_FIRST},
 608         { NULL, 0 },
 609 };
 610
 611 static struct string_lookup tim2_lookups[] = {
 612         { "TIM2_CLKSEL", TIM2_CLKSEL},
 613         { "TIM2_IVS",    TIM2_IVS},
 614         { "TIM2_IHS",    TIM2_IHS},
 615         { "TIM2_IPC",    TIM2_IPC},
 616         { "TIM2_IOE",    TIM2_IOE},
 617         { "TIM2_BCD",    TIM2_BCD},
 618         { NULL, 0},
 619 };
 620 static struct string_lookup cntl_lookups[] = {
 621         {"CNTL_LCDEN",        CNTL_LCDEN},
 622         {"CNTL_LCDBPP1",      CNTL_LCDBPP1},
 623         {"CNTL_LCDBPP2",      CNTL_LCDBPP2},
 624         {"CNTL_LCDBPP4",      CNTL_LCDBPP4},
 625         {"CNTL_LCDBPP8",      CNTL_LCDBPP8},
 626         {"CNTL_LCDBPP16",     CNTL_LCDBPP16},
 627         {"CNTL_LCDBPP16_565", CNTL_LCDBPP16_565},
 628         {"CNTL_LCDBPP16_444", CNTL_LCDBPP16_444},
 629         {"CNTL_LCDBPP24",     CNTL_LCDBPP24},
 630         {"CNTL_LCDBW",        CNTL_LCDBW},
 631         {"CNTL_LCDTFT",       CNTL_LCDTFT},
 632         {"CNTL_LCDMONO8",     CNTL_LCDMONO8},
 633         {"CNTL_LCDDUAL",      CNTL_LCDDUAL},
 634         {"CNTL_BGR",          CNTL_BGR},
 635         {"CNTL_BEBO",         CNTL_BEBO},
 636         {"CNTL_BEPO",         CNTL_BEPO},
 637         {"CNTL_LCDPWR",       CNTL_LCDPWR},
 638         {"CNTL_LCDVCOMP(1)",  CNTL_LCDVCOMP(1)},
 639         {"CNTL_LCDVCOMP(2)",  CNTL_LCDVCOMP(2)},
 640         {"CNTL_LCDVCOMP(3)",  CNTL_LCDVCOMP(3)},
 641         {"CNTL_LCDVCOMP(4)",  CNTL_LCDVCOMP(4)},
 642         {"CNTL_LCDVCOMP(5)",  CNTL_LCDVCOMP(5)},
 643         {"CNTL_LCDVCOMP(6)",  CNTL_LCDVCOMP(6)},
 644         {"CNTL_LCDVCOMP(7)",  CNTL_LCDVCOMP(7)},
 645         {"CNTL_LDMAFIFOTIME", CNTL_LDMAFIFOTIME},
 646         {"CNTL_WATERMARK",    CNTL_WATERMARK},
 647         { NULL, 0},
 648 };
 649 static struct string_lookup caps_lookups[] = {
 650         {"CLCD_CAP_RGB444",  CLCD_CAP_RGB444},
 651         {"CLCD_CAP_RGB5551", CLCD_CAP_RGB5551},
 652         {"CLCD_CAP_RGB565",  CLCD_CAP_RGB565},
 653         {"CLCD_CAP_RGB888",  CLCD_CAP_RGB888},
 654         {"CLCD_CAP_BGR444",  CLCD_CAP_BGR444},
 655         {"CLCD_CAP_BGR5551", CLCD_CAP_BGR5551},
 656         {"CLCD_CAP_BGR565",  CLCD_CAP_BGR565},
 657         {"CLCD_CAP_BGR888",  CLCD_CAP_BGR888},
 658         {"CLCD_CAP_444",     CLCD_CAP_444},
 659         {"CLCD_CAP_5551",    CLCD_CAP_5551},
 660         {"CLCD_CAP_565",     CLCD_CAP_565},
 661         {"CLCD_CAP_888",     CLCD_CAP_888},
 662         {"CLCD_CAP_RGB",     CLCD_CAP_RGB},
 663         {"CLCD_CAP_BGR",     CLCD_CAP_BGR},
 664         {"CLCD_CAP_ALL",     CLCD_CAP_ALL},
 665         { NULL, 0},
 666 };
 667
 668 u32 parse_setting(struct string_lookup *lookup, const char *name)
 669 {
 670         int i = 0;
 671         while (lookup[i].string != NULL) {
 672                 if (strcmp(lookup[i].string, name) == 0)
 673                         return lookup[i].val;
 674                 ++i;
 675         }
 676         return -EINVAL;
 677 }
 678
 679 u32 get_string_lookup(struct device_node *node, const char *name,
 680                       struct string_lookup *lookup)
 681 {
 682         const char *string;
 683         int count, i, ret = 0;
 684
 685         count = of_property_count_strings(node, name);
 686         if (count >= 0)
 687                 for (i = 0; i < count; i++)
 688                         if (of_property_read_string_index(node, name, i,
 689                                         &string) == 0)
 690                                 ret |= parse_setting(lookup, string);
 691         return ret;
 692 }
 693
 694 int get_val(struct device_node *node, const char *string)
 695 {
 696         u32 ret = 0;
 697
 698         if (of_property_read_u32(node, string, &ret))
 699                 ret = -1;
 700         return ret;
 701 }
 702
 703 struct clcd_panel *getPanel(struct device_node *node)
 704 {
 705         static struct clcd_panel panel;
 706
 707         panel.mode.refresh      = get_val(node, "refresh");
 708         panel.mode.xres         = get_val(node, "xres");
 709         panel.mode.yres         = get_val(node, "yres");
 710         panel.mode.pixclock     = get_val(node, "pixclock");
 711         panel.mode.left_margin  = get_val(node, "left_margin");
 712         panel.mode.right_margin = get_val(node, "right_margin");
 713         panel.mode.upper_margin = get_val(node, "upper_margin");
 714         panel.mode.lower_margin = get_val(node, "lower_margin");
 715         panel.mode.hsync_len    = get_val(node, "hsync_len");
 716         panel.mode.vsync_len    = get_val(node, "vsync_len");
 717         panel.mode.sync         = get_val(node, "sync");
 718         panel.bpp               = get_val(node, "bpp");
 719         panel.width             = (signed short) get_val(node, "width");
 720         panel.height            = (signed short) get_val(node, "height");
 721
 722         panel.mode.vmode = get_string_lookup(node, "vmode", vmode_lookups);
 723         panel.tim2       = get_string_lookup(node, "tim2",  tim2_lookups);
 724         panel.cntl       = get_string_lookup(node, "cntl",  cntl_lookups);
 725         panel.caps       = get_string_lookup(node, "caps",  caps_lookups);
 726
 727         return &panel;
 728 }
 729
 730 struct clcd_panel *clcdfb_get_panel(const char *name)
 731 {
 732         struct device_node *node = NULL;
 733         const char *mode;
 734         struct clcd_panel *panel = NULL;
 735
 736         do {
 737                 node = of_find_compatible_node(node, NULL, "panel");
 738                 if (node)
 739                         if (of_property_read_string(node, "mode", &mode) == 0)
 740                                 if (strcmp(mode, name) == 0) {
 741                                         panel = getPanel(node);
 742                                         panel->mode.name = name;
 743                                 }
 744         } while (node != NULL);
 745
 746         return panel;
 747 }
 748
 749 #ifdef CONFIG_OF
 750 static int clcdfb_dt_init(struct clcd_fb *fb)
 751 {
 752         int err = 0;
 753         struct device_node *node;
 754         const char *mode;
 755         dma_addr_t dma;
 756         u32 use_dma;
 757         const __be32 *prop;
 758         int len, na, ns;
 759         phys_addr_t fb_base, fb_size;
 760
 761         node = fb->dev->dev.of_node;
 762         if (!node)
 763                 return -ENODEV;
 764
 765         na = of_n_addr_cells(node);
 766         ns = of_n_size_cells(node);
 767
 768         if (def_mode && strlen(def_mode) > 0) {
 769                 fb->panel = clcdfb_get_panel(def_mode);
 770                 if (!fb->panel)
 771                         printk(KERN_ERR "CLCD: invalid mode specified on the command line (%s)\n", def_mode);
 772         }
 773
 774         if (!fb->panel) {
 775                 if (WARN_ON(of_property_read_string(node, "mode", &mode)))
 776                         return -ENODEV;
 777                 fb->panel = clcdfb_get_panel(mode);
 778         }
 779
 780         if (!fb->panel)
 781                 return -EINVAL;
 782         fb->fb.fix.smem_len = fb->panel->mode.xres * fb->panel->mode.yres * 2;
 783
 784         fb->board->name         = "Device Tree CLCD PL111";
 785         fb->board->caps         = CLCD_CAP_5551 | CLCD_CAP_565;
 786         fb->board->check        = clcdfb_check;
 787         fb->board->decode       = clcdfb_decode;
 788
 789         if (of_property_read_u32(node, "use_dma", &use_dma))
 790                 use_dma = 0;
 791
 792         if (use_dma) {
 793                 fb->fb.screen_base = clcdfb_dma_alloc(&fb->dev->dev,
 794                                                       fb->fb.fix.smem_len,
 795                                                       &dma, GFP_KERNEL);
 796                 if (!fb->fb.screen_base) {
 797                         pr_err("CLCD: unable to map framebuffer\n");
 798                         return -ENOMEM;
 799                 }
 800
 801                 fb->fb.fix.smem_start   = dma;
 802                 fb->board->mmap         = clcdfb_mmap_dma;
 803                 fb->board->remove       = clcdfb_remove_dma;
 804         } else {
 805                 prop = of_get_property(node, "framebuffer", &len);
 806                 if (WARN_ON(!prop || len < (na + ns) * sizeof(*prop)))
 807                         return -EINVAL;
 808
 809                 fb_base = of_read_number(prop, na);
 810                 fb_size = of_read_number(prop + na, ns);
 811
 812                 fb->fb.fix.smem_start   = fb_base;
 813                 fb->fb.screen_base      = ioremap_wc(fb_base, fb_size);
 814                 fb->board->mmap         = clcdfb_mmap_io;
 815                 fb->board->remove       = clcdfb_remove_io;
 816         }
 817
 818         return err;
 819 }
 820 #endif /* CONFIG_OF */
 821
 822 static int clcdfb_probe(struct amba_device *dev, const struct amba_id *id)
 823 {
 824         struct clcd_board *board = dev->dev.platform_data;
 825         struct clcd_fb *fb;
 826         int ret;
 827
 828         if (!board) {
 829 #ifdef CONFIG_OF
 830                 if (dev->dev.of_node) {
 831                         board = kzalloc(sizeof(struct clcd_board), GFP_KERNEL);
 832                         if (!board)
 833                                 return -ENOMEM;
 834                         board->setup   = clcdfb_dt_init;
 835                 } else
 836 #endif
 837                         return -EINVAL;
 838         }
 839
 840         ret = amba_request_regions(dev, NULL);
 841         if (ret) {
 842                 printk(KERN_ERR "CLCD: unable to reserve regs region\n");
 843                 goto out;
 844         }
 845
 846         fb = kzalloc(sizeof(struct clcd_fb), GFP_KERNEL);
 847         if (!fb) {
 848                 printk(KERN_INFO "CLCD: could not allocate new clcd_fb struct\n");
 849                 ret = -ENOMEM;
 850                 goto free_region;
 851         }
 852
 853         fb->dev = dev;
 854         fb->board = board;
 855
 856         dev_info(&fb->dev->dev, "PL%03x rev%u at 0x%08llx\n",
 857                 amba_part(dev), amba_rev(dev),
 858                 (unsigned long long)dev->res.start);
 859
 860         ret = fb->board->setup(fb);
 861         if (ret)
 862                 goto free_fb;
 863
 864         ret = clcdfb_register(fb);
 865         if (ret == 0) {
 866                 amba_set_drvdata(dev, fb);
 867                 goto out;
 868         }
 869
 870         fb->board->remove(fb);
 871  free_fb:
 872         kfree(fb);
 873  free_region:
 874         amba_release_regions(dev);
 875  out:
 876         return ret;
 877 }
 878
 879 static int clcdfb_remove(struct amba_device *dev)
 880 {
 881         struct clcd_fb *fb = amba_get_drvdata(dev);
 882
 883         amba_set_drvdata(dev, NULL);
 884
 885         clcdfb_disable(fb);
 886         unregister_framebuffer(&fb->fb);
 887         if (fb->fb.cmap.len)
 888                 fb_dealloc_cmap(&fb->fb.cmap);
 889         iounmap(fb->regs);
 890         clk_unprepare(fb->clk);
 891         clk_put(fb->clk);
 892
 893         fb->board->remove(fb);
 894
 895         kfree(fb);
 896
 897         amba_release_regions(dev);
 898
 899         return 0;
 900 }
 901
 902 static struct amba_id clcdfb_id_table[] = {
 903         {
 904                 .id     = 0x00041110,
 905                 .mask   = 0x000ffffe,
 906         },
 907         { 0, 0 },
 908 };
 909
 910 MODULE_DEVICE_TABLE(amba, clcdfb_id_table);
 911
 912 static struct amba_driver clcd_driver = {
 913         .drv            = {
 914                 .name   = "clcd-pl11x",
 915         },
 916         .probe          = clcdfb_probe,
 917         .remove         = clcdfb_remove,
 918         .id_table       = clcdfb_id_table,
 919 };
 920
 921 static int __init amba_clcdfb_init(void)
 922 {
 923         if (fb_get_options("ambafb", NULL))
 924                 return -ENODEV;
 925
 926         return amba_driver_register(&clcd_driver);
 927 }
 928
 929 module_init(amba_clcdfb_init);
 930
 931 static void __exit amba_clcdfb_exit(void)
 932 {
 933         amba_driver_unregister(&clcd_driver);
 934 }
 935
 936 module_exit(amba_clcdfb_exit);
 937
 938 MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver");
 939 MODULE_LICENSE("GPL");