drivers/video/fbdev/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/amba/bus.h>
  14 #include <linux/amba/clcd.h>
  15 #include <linux/backlight.h>
  16 #include <linux/clk.h>
  17 #include <linux/delay.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/fb.h>
  20 #include <linux/init.h>
  21 #include <linux/ioport.h>
  22 #include <linux/list.h>
  23 #include <linux/mm.h>
  24 #include <linux/module.h>
  25 #include <linux/of_address.h>
  26 #include <linux/of_graph.h>
  27 #include <linux/slab.h>
  28 #include <linux/string.h>
  29 #include <video/display_timing.h>
  30 #include <video/of_display_timing.h>
  31 #include <video/videomode.h>
  32
  33 #define to_clcd(info)   container_of(info, struct clcd_fb, fb)
  34
  35 /* This is limited to 16 characters when displayed by X startup */
  36 static const char *clcd_name = "CLCD FB";
  37
  38 /*
  39  * Unfortunately, the enable/disable functions may be called either from
  40  * process or IRQ context, and we _need_ to delay.  This is _not_ good.
  41  */
  42 static inline void clcdfb_sleep(unsigned int ms)
  43 {
  44         if (in_atomic()) {
  45                 mdelay(ms);
  46         } else {
  47                 msleep(ms);
  48         }
  49 }
  50
  51 static inline void clcdfb_set_start(struct clcd_fb *fb)
  52 {
  53         unsigned long ustart = fb->fb.fix.smem_start;
  54         unsigned long lstart;
  55
  56         ustart += fb->fb.var.yoffset * fb->fb.fix.line_length;
  57         lstart = ustart + fb->fb.var.yres * fb->fb.fix.line_length / 2;
  58
  59         writel(ustart, fb->regs + CLCD_UBAS);
  60         writel(lstart, fb->regs + CLCD_LBAS);
  61 }
  62
  63 static void clcdfb_disable(struct clcd_fb *fb)
  64 {
  65         u32 val;
  66
  67         if (fb->board->disable)
  68                 fb->board->disable(fb);
  69
  70         if (fb->panel->backlight) {
  71                 fb->panel->backlight->props.power = FB_BLANK_POWERDOWN;
  72                 backlight_update_status(fb->panel->backlight);
  73         }
  74
  75         val = readl(fb->regs + fb->off_cntl);
  76         if (val & CNTL_LCDPWR) {
  77                 val &= ~CNTL_LCDPWR;
  78                 writel(val, fb->regs + fb->off_cntl);
  79
  80                 clcdfb_sleep(20);
  81         }
  82         if (val & CNTL_LCDEN) {
  83                 val &= ~CNTL_LCDEN;
  84                 writel(val, fb->regs + fb->off_cntl);
  85         }
  86
  87         /*
  88          * Disable CLCD clock source.
  89          */
  90         if (fb->clk_enabled) {
  91                 fb->clk_enabled = false;
  92                 clk_disable(fb->clk);
  93         }
  94 }
  95
  96 static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
  97 {
  98         /*
  99          * Enable the CLCD clock source.
 100          */
 101         if (!fb->clk_enabled) {
 102                 fb->clk_enabled = true;
 103                 clk_enable(fb->clk);
 104         }
 105
 106         /*
 107          * Bring up by first enabling..
 108          */
 109         cntl |= CNTL_LCDEN;
 110         writel(cntl, fb->regs + fb->off_cntl);
 111
 112         clcdfb_sleep(20);
 113
 114         /*
 115          * and now apply power.
 116          */
 117         cntl |= CNTL_LCDPWR;
 118         writel(cntl, fb->regs + fb->off_cntl);
 119
 120         /*
 121          * Turn on backlight
 122          */
 123         if (fb->panel->backlight) {
 124                 fb->panel->backlight->props.power = FB_BLANK_UNBLANK;
 125                 backlight_update_status(fb->panel->backlight);
 126         }
 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 static int clcdfb_mmap(struct fb_info *info,
 411                        struct vm_area_struct *vma)
 412 {
 413         struct clcd_fb *fb = to_clcd(info);
 414         unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT;
 415         int ret = -EINVAL;
 416
 417         len = info->fix.smem_len;
 418
 419         if (off <= len && vma->vm_end - vma->vm_start <= len - off &&
 420             fb->board->mmap)
 421                 ret = fb->board->mmap(fb, vma);
 422
 423         return ret;
 424 }
 425
 426 static const struct fb_ops clcdfb_ops = {
 427         .owner          = THIS_MODULE,
 428         .fb_check_var   = clcdfb_check_var,
 429         .fb_set_par     = clcdfb_set_par,
 430         .fb_setcolreg   = clcdfb_setcolreg,
 431         .fb_blank       = clcdfb_blank,
 432         .fb_fillrect    = cfb_fillrect,
 433         .fb_copyarea    = cfb_copyarea,
 434         .fb_imageblit   = cfb_imageblit,
 435         .fb_mmap        = clcdfb_mmap,
 436 };
 437
 438 static int clcdfb_register(struct clcd_fb *fb)
 439 {
 440         int ret;
 441
 442         /*
 443          * ARM PL111 always has IENB at 0x1c; it's only PL110
 444          * which is reversed on some platforms.
 445          */
 446         if (amba_manf(fb->dev) == 0x41 && amba_part(fb->dev) == 0x111) {
 447                 fb->off_ienb = CLCD_PL111_IENB;
 448                 fb->off_cntl = CLCD_PL111_CNTL;
 449         } else {
 450                 fb->off_ienb = CLCD_PL110_IENB;
 451                 fb->off_cntl = CLCD_PL110_CNTL;
 452         }
 453
 454         fb->clk = clk_get(&fb->dev->dev, NULL);
 455         if (IS_ERR(fb->clk)) {
 456                 ret = PTR_ERR(fb->clk);
 457                 goto out;
 458         }
 459
 460         ret = clk_prepare(fb->clk);
 461         if (ret)
 462                 goto free_clk;
 463
 464         fb->fb.device           = &fb->dev->dev;
 465
 466         fb->fb.fix.mmio_start   = fb->dev->res.start;
 467         fb->fb.fix.mmio_len     = resource_size(&fb->dev->res);
 468
 469         fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len);
 470         if (!fb->regs) {
 471                 printk(KERN_ERR "CLCD: unable to remap registers\n");
 472                 ret = -ENOMEM;
 473                 goto clk_unprep;
 474         }
 475
 476         fb->fb.fbops            = &clcdfb_ops;
 477         fb->fb.flags            = FBINFO_FLAG_DEFAULT;
 478         fb->fb.pseudo_palette   = fb->cmap;
 479
 480         strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id));
 481         fb->fb.fix.type         = FB_TYPE_PACKED_PIXELS;
 482         fb->fb.fix.type_aux     = 0;
 483         fb->fb.fix.xpanstep     = 0;
 484         fb->fb.fix.ypanstep     = 0;
 485         fb->fb.fix.ywrapstep    = 0;
 486         fb->fb.fix.accel        = FB_ACCEL_NONE;
 487
 488         fb->fb.var.xres         = fb->panel->mode.xres;
 489         fb->fb.var.yres         = fb->panel->mode.yres;
 490         fb->fb.var.xres_virtual = fb->panel->mode.xres;
 491         fb->fb.var.yres_virtual = fb->panel->mode.yres;
 492         fb->fb.var.bits_per_pixel = fb->panel->bpp;
 493         fb->fb.var.grayscale    = fb->panel->grayscale;
 494         fb->fb.var.pixclock     = fb->panel->mode.pixclock;
 495         fb->fb.var.left_margin  = fb->panel->mode.left_margin;
 496         fb->fb.var.right_margin = fb->panel->mode.right_margin;
 497         fb->fb.var.upper_margin = fb->panel->mode.upper_margin;
 498         fb->fb.var.lower_margin = fb->panel->mode.lower_margin;
 499         fb->fb.var.hsync_len    = fb->panel->mode.hsync_len;
 500         fb->fb.var.vsync_len    = fb->panel->mode.vsync_len;
 501         fb->fb.var.sync         = fb->panel->mode.sync;
 502         fb->fb.var.vmode        = fb->panel->mode.vmode;
 503         fb->fb.var.activate     = FB_ACTIVATE_NOW;
 504         fb->fb.var.nonstd       = 0;
 505         fb->fb.var.height       = fb->panel->height;
 506         fb->fb.var.width        = fb->panel->width;
 507         fb->fb.var.accel_flags  = 0;
 508
 509         fb->fb.monspecs.hfmin   = 0;
 510         fb->fb.monspecs.hfmax   = 100000;
 511         fb->fb.monspecs.vfmin   = 0;
 512         fb->fb.monspecs.vfmax   = 400;
 513         fb->fb.monspecs.dclkmin = 1000000;
 514         fb->fb.monspecs.dclkmax = 100000000;
 515
 516         /*
 517          * Make sure that the bitfields are set appropriately.
 518          */
 519         clcdfb_set_bitfields(fb, &fb->fb.var);
 520
 521         /*
 522          * Allocate colourmap.
 523          */
 524         ret = fb_alloc_cmap(&fb->fb.cmap, 256, 0);
 525         if (ret)
 526                 goto unmap;
 527
 528         /*
 529          * Ensure interrupts are disabled.
 530          */
 531         writel(0, fb->regs + fb->off_ienb);
 532
 533         fb_set_var(&fb->fb, &fb->fb.var);
 534
 535         dev_info(&fb->dev->dev, "%s hardware, %s display\n",
 536                  fb->board->name, fb->panel->mode.name);
 537
 538         ret = register_framebuffer(&fb->fb);
 539         if (ret == 0)
 540                 goto out;
 541
 542         printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret);
 543
 544         fb_dealloc_cmap(&fb->fb.cmap);
 545  unmap:
 546         iounmap(fb->regs);
 547  clk_unprep:
 548         clk_unprepare(fb->clk);
 549  free_clk:
 550         clk_put(fb->clk);
 551  out:
 552         return ret;
 553 }
 554
 555 #ifdef CONFIG_OF
 556 static int clcdfb_of_get_dpi_panel_mode(struct device_node *node,
 557                 struct clcd_panel *clcd_panel)
 558 {
 559         int err;
 560         struct display_timing timing;
 561         struct videomode video;
 562
 563         err = of_get_display_timing(node, "panel-timing", &timing);
 564         if (err) {
 565                 pr_err("%pOF: problems parsing panel-timing (%d)\n", node, err);
 566                 return err;
 567         }
 568
 569         videomode_from_timing(&timing, &video);
 570
 571         err = fb_videomode_from_videomode(&video, &clcd_panel->mode);
 572         if (err)
 573                 return err;
 574
 575         /* Set up some inversion flags */
 576         if (timing.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
 577                 clcd_panel->tim2 |= TIM2_IPC;
 578         else if (!(timing.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE))
 579                 /*
 580                  * To preserve backwards compatibility, the IPC (inverted
 581                  * pixel clock) flag needs to be set on any display that
 582                  * doesn't explicitly specify that the pixel clock is
 583                  * active on the negative or positive edge.
 584                  */
 585                 clcd_panel->tim2 |= TIM2_IPC;
 586
 587         if (timing.flags & DISPLAY_FLAGS_HSYNC_LOW)
 588                 clcd_panel->tim2 |= TIM2_IHS;
 589
 590         if (timing.flags & DISPLAY_FLAGS_VSYNC_LOW)
 591                 clcd_panel->tim2 |= TIM2_IVS;
 592
 593         if (timing.flags & DISPLAY_FLAGS_DE_LOW)
 594                 clcd_panel->tim2 |= TIM2_IOE;
 595
 596         return 0;
 597 }
 598
 599 static int clcdfb_snprintf_mode(char *buf, int size, struct fb_videomode *mode)
 600 {
 601         return snprintf(buf, size, "%ux%u@%u", mode->xres, mode->yres,
 602                         mode->refresh);
 603 }
 604
 605 static int clcdfb_of_get_backlight(struct device *dev,
 606                                    struct clcd_panel *clcd_panel)
 607 {
 608         struct backlight_device *backlight;
 609
 610         /* Look up the optional backlight device */
 611         backlight = devm_of_find_backlight(dev);
 612         if (IS_ERR(backlight))
 613                 return PTR_ERR(backlight);
 614
 615         clcd_panel->backlight = backlight;
 616         return 0;
 617 }
 618
 619 static int clcdfb_of_get_mode(struct device *dev, struct device_node *panel,
 620                               struct clcd_panel *clcd_panel)
 621 {
 622         int err;
 623         struct fb_videomode *mode;
 624         char *name;
 625         int len;
 626
 627         /* Only directly connected DPI panels supported for now */
 628         if (of_device_is_compatible(panel, "panel-dpi"))
 629                 err = clcdfb_of_get_dpi_panel_mode(panel, clcd_panel);
 630         else
 631                 err = -ENOENT;
 632         if (err)
 633                 return err;
 634         mode = &clcd_panel->mode;
 635
 636         len = clcdfb_snprintf_mode(NULL, 0, mode);
 637         name = devm_kzalloc(dev, len + 1, GFP_KERNEL);
 638         if (!name)
 639                 return -ENOMEM;
 640
 641         clcdfb_snprintf_mode(name, len + 1, mode);
 642         mode->name = name;
 643
 644         return 0;
 645 }
 646
 647 static int clcdfb_of_init_tft_panel(struct clcd_fb *fb, u32 r0, u32 g0, u32 b0)
 648 {
 649         static struct {
 650                 unsigned int part;
 651                 u32 r0, g0, b0;
 652                 u32 caps;
 653         } panels[] = {
 654                 { 0x110, 1,  7, 13, CLCD_CAP_5551 },
 655                 { 0x110, 0,  8, 16, CLCD_CAP_888 },
 656                 { 0x110, 16, 8, 0,  CLCD_CAP_888 },
 657                 { 0x111, 4, 14, 20, CLCD_CAP_444 },
 658                 { 0x111, 3, 11, 19, CLCD_CAP_444 | CLCD_CAP_5551 },
 659                 { 0x111, 3, 10, 19, CLCD_CAP_444 | CLCD_CAP_5551 |
 660                                     CLCD_CAP_565 },
 661                 { 0x111, 0,  8, 16, CLCD_CAP_444 | CLCD_CAP_5551 |
 662                                     CLCD_CAP_565 | CLCD_CAP_888 },
 663         };
 664         int i;
 665
 666         /* Bypass pixel clock divider */
 667         fb->panel->tim2 |= TIM2_BCD;
 668
 669         /* TFT display, vert. comp. interrupt at the start of the back porch */
 670         fb->panel->cntl |= CNTL_LCDTFT | CNTL_LCDVCOMP(1);
 671
 672         fb->panel->caps = 0;
 673
 674         /* Match the setup with known variants */
 675         for (i = 0; i < ARRAY_SIZE(panels) && !fb->panel->caps; i++) {
 676                 if (amba_part(fb->dev) != panels[i].part)
 677                         continue;
 678                 if (g0 != panels[i].g0)
 679                         continue;
 680                 if (r0 == panels[i].r0 && b0 == panels[i].b0)
 681                         fb->panel->caps = panels[i].caps;
 682         }
 683
 684         /*
 685          * If we actually physically connected the R lines to B and
 686          * vice versa
 687          */
 688         if (r0 != 0 && b0 == 0)
 689                 fb->panel->bgr_connection = true;
 690
 691         return fb->panel->caps ? 0 : -EINVAL;
 692 }
 693
 694 static int clcdfb_of_init_display(struct clcd_fb *fb)
 695 {
 696         struct device_node *endpoint, *panel;
 697         int err;
 698         unsigned int bpp;
 699         u32 max_bandwidth;
 700         u32 tft_r0b0g0[3];
 701
 702         fb->panel = devm_kzalloc(&fb->dev->dev, sizeof(*fb->panel), GFP_KERNEL);
 703         if (!fb->panel)
 704                 return -ENOMEM;
 705
 706         /*
 707          * Fetch the panel endpoint.
 708          */
 709         endpoint = of_graph_get_next_endpoint(fb->dev->dev.of_node, NULL);
 710         if (!endpoint)
 711                 return -ENODEV;
 712
 713         panel = of_graph_get_remote_port_parent(endpoint);
 714         if (!panel)
 715                 return -ENODEV;
 716
 717         err = clcdfb_of_get_backlight(&fb->dev->dev, fb->panel);
 718         if (err)
 719                 return err;
 720
 721         err = clcdfb_of_get_mode(&fb->dev->dev, panel, fb->panel);
 722         if (err)
 723                 return err;
 724
 725         err = of_property_read_u32(fb->dev->dev.of_node, "max-memory-bandwidth",
 726                         &max_bandwidth);
 727         if (!err) {
 728                 /*
 729                  * max_bandwidth is in bytes per second and pixclock in
 730                  * pico-seconds, so the maximum allowed bits per pixel is
 731                  *   8 * max_bandwidth / (PICOS2KHZ(pixclock) * 1000)
 732                  * Rearrange this calculation to avoid overflow and then ensure
 733                  * result is a valid format.
 734                  */
 735                 bpp = max_bandwidth / (1000 / 8)
 736                         / PICOS2KHZ(fb->panel->mode.pixclock);
 737                 bpp = rounddown_pow_of_two(bpp);
 738                 if (bpp > 32)
 739                         bpp = 32;
 740         } else
 741                 bpp = 32;
 742         fb->panel->bpp = bpp;
 743
 744 #ifdef CONFIG_CPU_BIG_ENDIAN
 745         fb->panel->cntl |= CNTL_BEBO;
 746 #endif
 747         fb->panel->width = -1;
 748         fb->panel->height = -1;
 749
 750         if (of_property_read_u32_array(endpoint,
 751                         "arm,pl11x,tft-r0g0b0-pads",
 752                         tft_r0b0g0, ARRAY_SIZE(tft_r0b0g0)) != 0)
 753                 return -ENOENT;
 754
 755         return clcdfb_of_init_tft_panel(fb, tft_r0b0g0[0],
 756                                         tft_r0b0g0[1],  tft_r0b0g0[2]);
 757 }
 758
 759 static int clcdfb_of_vram_setup(struct clcd_fb *fb)
 760 {
 761         int err;
 762         struct device_node *memory;
 763         u64 size;
 764
 765         err = clcdfb_of_init_display(fb);
 766         if (err)
 767                 return err;
 768
 769         memory = of_parse_phandle(fb->dev->dev.of_node, "memory-region", 0);
 770         if (!memory)
 771                 return -ENODEV;
 772
 773         fb->fb.screen_base = of_iomap(memory, 0);
 774         if (!fb->fb.screen_base)
 775                 return -ENOMEM;
 776
 777         fb->fb.fix.smem_start = of_translate_address(memory,
 778                         of_get_address(memory, 0, &size, NULL));
 779         fb->fb.fix.smem_len = size;
 780
 781         return 0;
 782 }
 783
 784 static int clcdfb_of_vram_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
 785 {
 786         unsigned long off, user_size, kernel_size;
 787
 788
 789         off = vma->vm_pgoff << PAGE_SHIFT;
 790         user_size = vma->vm_end - vma->vm_start;
 791         kernel_size = fb->fb.fix.smem_len;
 792
 793         if (off >= kernel_size || user_size > (kernel_size - off))
 794                 return -ENXIO;
 795
 796         return remap_pfn_range(vma, vma->vm_start,
 797                         __phys_to_pfn(fb->fb.fix.smem_start) + vma->vm_pgoff,
 798                         user_size,
 799                         pgprot_writecombine(vma->vm_page_prot));
 800 }
 801
 802 static void clcdfb_of_vram_remove(struct clcd_fb *fb)
 803 {
 804         iounmap(fb->fb.screen_base);
 805 }
 806
 807 static int clcdfb_of_dma_setup(struct clcd_fb *fb)
 808 {
 809         unsigned long framesize;
 810         dma_addr_t dma;
 811         int err;
 812
 813         err = clcdfb_of_init_display(fb);
 814         if (err)
 815                 return err;
 816
 817         framesize = PAGE_ALIGN(fb->panel->mode.xres * fb->panel->mode.yres *
 818                         fb->panel->bpp / 8);
 819         fb->fb.screen_base = dma_alloc_coherent(&fb->dev->dev, framesize,
 820                         &dma, GFP_KERNEL);
 821         if (!fb->fb.screen_base)
 822                 return -ENOMEM;
 823
 824         fb->fb.fix.smem_start = dma;
 825         fb->fb.fix.smem_len = framesize;
 826
 827         return 0;
 828 }
 829
 830 static int clcdfb_of_dma_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
 831 {
 832         return dma_mmap_wc(&fb->dev->dev, vma, fb->fb.screen_base,
 833                            fb->fb.fix.smem_start, fb->fb.fix.smem_len);
 834 }
 835
 836 static void clcdfb_of_dma_remove(struct clcd_fb *fb)
 837 {
 838         dma_free_coherent(&fb->dev->dev, fb->fb.fix.smem_len,
 839                         fb->fb.screen_base, fb->fb.fix.smem_start);
 840 }
 841
 842 static struct clcd_board *clcdfb_of_get_board(struct amba_device *dev)
 843 {
 844         struct clcd_board *board = devm_kzalloc(&dev->dev, sizeof(*board),
 845                         GFP_KERNEL);
 846         struct device_node *node = dev->dev.of_node;
 847
 848         if (!board)
 849                 return NULL;
 850
 851         board->name = of_node_full_name(node);
 852         board->caps = CLCD_CAP_ALL;
 853         board->check = clcdfb_check;
 854         board->decode = clcdfb_decode;
 855         if (of_find_property(node, "memory-region", NULL)) {
 856                 board->setup = clcdfb_of_vram_setup;
 857                 board->mmap = clcdfb_of_vram_mmap;
 858                 board->remove = clcdfb_of_vram_remove;
 859         } else {
 860                 board->setup = clcdfb_of_dma_setup;
 861                 board->mmap = clcdfb_of_dma_mmap;
 862                 board->remove = clcdfb_of_dma_remove;
 863         }
 864
 865         return board;
 866 }
 867 #else
 868 static struct clcd_board *clcdfb_of_get_board(struct amba_device *dev)
 869 {
 870         return NULL;
 871 }
 872 #endif
 873
 874 static int clcdfb_probe(struct amba_device *dev, const struct amba_id *id)
 875 {
 876         struct clcd_board *board = dev_get_platdata(&dev->dev);
 877         struct clcd_fb *fb;
 878         int ret;
 879
 880         if (!board)
 881                 board = clcdfb_of_get_board(dev);
 882
 883         if (!board)
 884                 return -EINVAL;
 885
 886         ret = dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
 887         if (ret)
 888                 goto out;
 889
 890         ret = amba_request_regions(dev, NULL);
 891         if (ret) {
 892                 printk(KERN_ERR "CLCD: unable to reserve regs region\n");
 893                 goto out;
 894         }
 895
 896         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
 897         if (!fb) {
 898                 ret = -ENOMEM;
 899                 goto free_region;
 900         }
 901
 902         fb->dev = dev;
 903         fb->board = board;
 904
 905         dev_info(&fb->dev->dev, "PL%03x designer %02x rev%u at 0x%08llx\n",
 906                 amba_part(dev), amba_manf(dev), amba_rev(dev),
 907                 (unsigned long long)dev->res.start);
 908
 909         ret = fb->board->setup(fb);
 910         if (ret)
 911                 goto free_fb;
 912
 913         ret = clcdfb_register(fb);
 914         if (ret == 0) {
 915                 amba_set_drvdata(dev, fb);
 916                 goto out;
 917         }
 918
 919         fb->board->remove(fb);
 920  free_fb:
 921         kfree(fb);
 922  free_region:
 923         amba_release_regions(dev);
 924  out:
 925         return ret;
 926 }
 927
 928 static void clcdfb_remove(struct amba_device *dev)
 929 {
 930         struct clcd_fb *fb = amba_get_drvdata(dev);
 931
 932         clcdfb_disable(fb);
 933         unregister_framebuffer(&fb->fb);
 934         if (fb->fb.cmap.len)
 935                 fb_dealloc_cmap(&fb->fb.cmap);
 936         iounmap(fb->regs);
 937         clk_unprepare(fb->clk);
 938         clk_put(fb->clk);
 939
 940         fb->board->remove(fb);
 941
 942         kfree(fb);
 943
 944         amba_release_regions(dev);
 945 }
 946
 947 static const struct amba_id clcdfb_id_table[] = {
 948         {
 949                 .id     = 0x00041110,
 950                 .mask   = 0x000ffffe,
 951         },
 952         { 0, 0 },
 953 };
 954
 955 MODULE_DEVICE_TABLE(amba, clcdfb_id_table);
 956
 957 static struct amba_driver clcd_driver = {
 958         .drv            = {
 959                 .name   = "clcd-pl11x",
 960         },
 961         .probe          = clcdfb_probe,
 962         .remove         = clcdfb_remove,
 963         .id_table       = clcdfb_id_table,
 964 };
 965
 966 static int __init amba_clcdfb_init(void)
 967 {
 968         if (fb_get_options("ambafb", NULL))
 969                 return -ENODEV;
 970
 971         return amba_driver_register(&clcd_driver);
 972 }
 973
 974 module_init(amba_clcdfb_init);
 975
 976 static void __exit amba_clcdfb_exit(void)
 977 {
 978         amba_driver_unregister(&clcd_driver);
 979 }
 980
 981 module_exit(amba_clcdfb_exit);
 982
 983 MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver");
 984 MODULE_LICENSE("GPL");