drivers/video/s3c-fb.c

   1 /* linux/drivers/video/s3c-fb.c
   2  *
   3  * Copyright 2008 Openmoko Inc.
   4  * Copyright 2008-2010 Simtec Electronics
   5  *      Ben Dooks <ben@simtec.co.uk>
   6  *      http://armlinux.simtec.co.uk/
   7  *
   8  * Samsung SoC Framebuffer driver
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software FoundatIon.
  13 */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/slab.h>
  20 #include <linux/init.h>
  21 #include <linux/clk.h>
  22 #include <linux/fb.h>
  23 #include <linux/io.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/pm_runtime.h>
  27
  28 #include <mach/map.h>
  29 #include <plat/regs-fb-v4.h>
  30 #include <plat/fb.h>
  31
  32 /* This driver will export a number of framebuffer interfaces depending
  33  * on the configuration passed in via the platform data. Each fb instance
  34  * maps to a hardware window. Currently there is no support for runtime
  35  * setting of the alpha-blending functions that each window has, so only
  36  * window 0 is actually useful.
  37  *
  38  * Window 0 is treated specially, it is used for the basis of the LCD
  39  * output timings and as the control for the output power-down state.
  40 */
  41
  42 /* note, the previous use of <mach/regs-fb.h> to get platform specific data
  43  * has been replaced by using the platform device name to pick the correct
  44  * configuration data for the system.
  45 */
  46
  47 #ifdef CONFIG_FB_S3C_DEBUG_REGWRITE
  48 #undef writel
  49 #define writel(v, r) do { \
  50         printk(KERN_DEBUG "%s: %08x => %p\n", __func__, (unsigned int)v, r); \
  51         __raw_writel(v, r); } while(0)
  52 #endif /* FB_S3C_DEBUG_REGWRITE */
  53
  54 /* irq_flags bits */
  55 #define S3C_FB_VSYNC_IRQ_EN     0
  56
  57 #define VSYNC_TIMEOUT_MSEC 50
  58
  59 struct s3c_fb;
  60
  61 #define VALID_BPP(x) (1 << ((x) - 1))
  62
  63 #define OSD_BASE(win, variant) ((variant).osd + ((win) * (variant).osd_stride))
  64 #define VIDOSD_A(win, variant) (OSD_BASE(win, variant) + 0x00)
  65 #define VIDOSD_B(win, variant) (OSD_BASE(win, variant) + 0x04)
  66 #define VIDOSD_C(win, variant) (OSD_BASE(win, variant) + 0x08)
  67 #define VIDOSD_D(win, variant) (OSD_BASE(win, variant) + 0x0C)
  68
  69 /**
  70  * struct s3c_fb_variant - fb variant information
  71  * @is_2443: Set if S3C2443/S3C2416 style hardware.
  72  * @nr_windows: The number of windows.
  73  * @vidtcon: The base for the VIDTCONx registers
  74  * @wincon: The base for the WINxCON registers.
  75  * @winmap: The base for the WINxMAP registers.
  76  * @keycon: The abse for the WxKEYCON registers.
  77  * @buf_start: Offset of buffer start registers.
  78  * @buf_size: Offset of buffer size registers.
  79  * @buf_end: Offset of buffer end registers.
  80  * @osd: The base for the OSD registers.
  81  * @palette: Address of palette memory, or 0 if none.
  82  * @has_prtcon: Set if has PRTCON register.
  83  * @has_shadowcon: Set if has SHADOWCON register.
  84  */
  85 struct s3c_fb_variant {
  86         unsigned int    is_2443:1;
  87         unsigned short  nr_windows;
  88         unsigned short  vidtcon;
  89         unsigned short  wincon;
  90         unsigned short  winmap;
  91         unsigned short  keycon;
  92         unsigned short  buf_start;
  93         unsigned short  buf_end;
  94         unsigned short  buf_size;
  95         unsigned short  osd;
  96         unsigned short  osd_stride;
  97         unsigned short  palette[S3C_FB_MAX_WIN];
  98
  99         unsigned int    has_prtcon:1;
 100         unsigned int    has_shadowcon:1;
 101 };
 102
 103 /**
 104  * struct s3c_fb_win_variant
 105  * @has_osd_c: Set if has OSD C register.
 106  * @has_osd_d: Set if has OSD D register.
 107  * @has_osd_alpha: Set if can change alpha transparency for a window.
 108  * @palette_sz: Size of palette in entries.
 109  * @palette_16bpp: Set if palette is 16bits wide.
 110  * @osd_size_off: If != 0, supports setting up OSD for a window; the appropriate
 111  *                register is located at the given offset from OSD_BASE.
 112  * @valid_bpp: 1 bit per BPP setting to show valid bits-per-pixel.
 113  *
 114  * valid_bpp bit x is set if (x+1)BPP is supported.
 115  */
 116 struct s3c_fb_win_variant {
 117         unsigned int    has_osd_c:1;
 118         unsigned int    has_osd_d:1;
 119         unsigned int    has_osd_alpha:1;
 120         unsigned int    palette_16bpp:1;
 121         unsigned short  osd_size_off;
 122         unsigned short  palette_sz;
 123         u32             valid_bpp;
 124 };
 125
 126 /**
 127  * struct s3c_fb_driverdata - per-device type driver data for init time.
 128  * @variant: The variant information for this driver.
 129  * @win: The window information for each window.
 130  */
 131 struct s3c_fb_driverdata {
 132         struct s3c_fb_variant   variant;
 133         struct s3c_fb_win_variant *win[S3C_FB_MAX_WIN];
 134 };
 135
 136 /**
 137  * struct s3c_fb_palette - palette information
 138  * @r: Red bitfield.
 139  * @g: Green bitfield.
 140  * @b: Blue bitfield.
 141  * @a: Alpha bitfield.
 142  */
 143 struct s3c_fb_palette {
 144         struct fb_bitfield      r;
 145         struct fb_bitfield      g;
 146         struct fb_bitfield      b;
 147         struct fb_bitfield      a;
 148 };
 149
 150 /**
 151  * struct s3c_fb_win - per window private data for each framebuffer.
 152  * @windata: The platform data supplied for the window configuration.
 153  * @parent: The hardware that this window is part of.
 154  * @fbinfo: Pointer pack to the framebuffer info for this window.
 155  * @varint: The variant information for this window.
 156  * @palette_buffer: Buffer/cache to hold palette entries.
 157  * @pseudo_palette: For use in TRUECOLOUR modes for entries 0..15/
 158  * @index: The window number of this window.
 159  * @palette: The bitfields for changing r/g/b into a hardware palette entry.
 160  */
 161 struct s3c_fb_win {
 162         struct s3c_fb_pd_win    *windata;
 163         struct s3c_fb           *parent;
 164         struct fb_info          *fbinfo;
 165         struct s3c_fb_palette    palette;
 166         struct s3c_fb_win_variant variant;
 167
 168         u32                     *palette_buffer;
 169         u32                      pseudo_palette[16];
 170         unsigned int             index;
 171 };
 172
 173 /**
 174  * struct s3c_fb_vsync - vsync information
 175  * @wait:       a queue for processes waiting for vsync
 176  * @count:      vsync interrupt count
 177  */
 178 struct s3c_fb_vsync {
 179         wait_queue_head_t       wait;
 180         unsigned int            count;
 181 };
 182
 183 /**
 184  * struct s3c_fb - overall hardware state of the hardware
 185  * @dev: The device that we bound to, for printing, etc.
 186  * @regs_res: The resource we claimed for the IO registers.
 187  * @bus_clk: The clk (hclk) feeding our interface and possibly pixclk.
 188  * @regs: The mapped hardware registers.
 189  * @variant: Variant information for this hardware.
 190  * @enabled: A bitmask of enabled hardware windows.
 191  * @pdata: The platform configuration data passed with the device.
 192  * @windows: The hardware windows that have been claimed.
 193  * @irq_no: IRQ line number
 194  * @irq_flags: irq flags
 195  * @vsync_info: VSYNC-related information (count, queues...)
 196  */
 197 struct s3c_fb {
 198         struct device           *dev;
 199         struct resource         *regs_res;
 200         struct clk              *bus_clk;
 201         void __iomem            *regs;
 202         struct s3c_fb_variant    variant;
 203
 204         unsigned char            enabled;
 205
 206         struct s3c_fb_platdata  *pdata;
 207         struct s3c_fb_win       *windows[S3C_FB_MAX_WIN];
 208
 209         int                      irq_no;
 210         unsigned long            irq_flags;
 211         struct s3c_fb_vsync      vsync_info;
 212 };
 213
 214 /**
 215  * s3c_fb_validate_win_bpp - validate the bits-per-pixel for this mode.
 216  * @win: The device window.
 217  * @bpp: The bit depth.
 218  */
 219 static bool s3c_fb_validate_win_bpp(struct s3c_fb_win *win, unsigned int bpp)
 220 {
 221         return win->variant.valid_bpp & VALID_BPP(bpp);
 222 }
 223
 224 /**
 225  * s3c_fb_check_var() - framebuffer layer request to verify a given mode.
 226  * @var: The screen information to verify.
 227  * @info: The framebuffer device.
 228  *
 229  * Framebuffer layer call to verify the given information and allow us to
 230  * update various information depending on the hardware capabilities.
 231  */
 232 static int s3c_fb_check_var(struct fb_var_screeninfo *var,
 233                             struct fb_info *info)
 234 {
 235         struct s3c_fb_win *win = info->par;
 236         struct s3c_fb_pd_win *windata = win->windata;
 237         struct s3c_fb *sfb = win->parent;
 238
 239         dev_dbg(sfb->dev, "checking parameters\n");
 240
 241         var->xres_virtual = max((unsigned int)windata->virtual_x, var->xres);
 242         var->yres_virtual = max((unsigned int)windata->virtual_y, var->yres);
 243
 244         if (!s3c_fb_validate_win_bpp(win, var->bits_per_pixel)) {
 245                 dev_dbg(sfb->dev, "win %d: unsupported bpp %d\n",
 246                         win->index, var->bits_per_pixel);
 247                 return -EINVAL;
 248         }
 249
 250         /* always ensure these are zero, for drop through cases below */
 251         var->transp.offset = 0;
 252         var->transp.length = 0;
 253
 254         switch (var->bits_per_pixel) {
 255         case 1:
 256         case 2:
 257         case 4:
 258         case 8:
 259                 if (sfb->variant.palette[win->index] != 0) {
 260                         /* non palletised, A:1,R:2,G:3,B:2 mode */
 261                         var->red.offset         = 4;
 262                         var->green.offset       = 2;
 263                         var->blue.offset        = 0;
 264                         var->red.length         = 5;
 265                         var->green.length       = 3;
 266                         var->blue.length        = 2;
 267                         var->transp.offset      = 7;
 268                         var->transp.length      = 1;
 269                 } else {
 270                         var->red.offset = 0;
 271                         var->red.length = var->bits_per_pixel;
 272                         var->green      = var->red;
 273                         var->blue       = var->red;
 274                 }
 275                 break;
 276
 277         case 19:
 278                 /* 666 with one bit alpha/transparency */
 279                 var->transp.offset      = 18;
 280                 var->transp.length      = 1;
 281         case 18:
 282                 var->bits_per_pixel     = 32;
 283
 284                 /* 666 format */
 285                 var->red.offset         = 12;
 286                 var->green.offset       = 6;
 287                 var->blue.offset        = 0;
 288                 var->red.length         = 6;
 289                 var->green.length       = 6;
 290                 var->blue.length        = 6;
 291                 break;
 292
 293         case 16:
 294                 /* 16 bpp, 565 format */
 295                 var->red.offset         = 11;
 296                 var->green.offset       = 5;
 297                 var->blue.offset        = 0;
 298                 var->red.length         = 5;
 299                 var->green.length       = 6;
 300                 var->blue.length        = 5;
 301                 break;
 302
 303         case 28:
 304         case 25:
 305                 var->transp.length      = var->bits_per_pixel - 24;
 306                 var->transp.offset      = 24;
 307                 /* drop through */
 308         case 24:
 309                 /* our 24bpp is unpacked, so 32bpp */
 310                 var->bits_per_pixel     = 32;
 311         case 32:
 312                 var->red.offset         = 16;
 313                 var->red.length         = 8;
 314                 var->green.offset       = 8;
 315                 var->green.length       = 8;
 316                 var->blue.offset        = 0;
 317                 var->blue.length        = 8;
 318                 break;
 319
 320         default:
 321                 dev_err(sfb->dev, "invalid bpp\n");
 322         }
 323
 324         dev_dbg(sfb->dev, "%s: verified parameters\n", __func__);
 325         return 0;
 326 }
 327
 328 /**
 329  * s3c_fb_calc_pixclk() - calculate the divider to create the pixel clock.
 330  * @sfb: The hardware state.
 331  * @pixclock: The pixel clock wanted, in picoseconds.
 332  *
 333  * Given the specified pixel clock, work out the necessary divider to get
 334  * close to the output frequency.
 335  */
 336 static int s3c_fb_calc_pixclk(struct s3c_fb *sfb, unsigned int pixclk)
 337 {
 338         unsigned long clk = clk_get_rate(sfb->bus_clk);
 339         unsigned long long tmp;
 340         unsigned int result;
 341
 342         tmp = (unsigned long long)clk;
 343         tmp *= pixclk;
 344
 345         do_div(tmp, 1000000000UL);
 346         result = (unsigned int)tmp / 1000;
 347
 348         dev_dbg(sfb->dev, "pixclk=%u, clk=%lu, div=%d (%lu)\n",
 349                 pixclk, clk, result, clk / result);
 350
 351         return result;
 352 }
 353
 354 /**
 355  * s3c_fb_align_word() - align pixel count to word boundary
 356  * @bpp: The number of bits per pixel
 357  * @pix: The value to be aligned.
 358  *
 359  * Align the given pixel count so that it will start on an 32bit word
 360  * boundary.
 361  */
 362 static int s3c_fb_align_word(unsigned int bpp, unsigned int pix)
 363 {
 364         int pix_per_word;
 365
 366         if (bpp > 16)
 367                 return pix;
 368
 369         pix_per_word = (8 * 32) / bpp;
 370         return ALIGN(pix, pix_per_word);
 371 }
 372
 373 /**
 374  * vidosd_set_size() - set OSD size for a window
 375  *
 376  * @win: the window to set OSD size for
 377  * @size: OSD size register value
 378  */
 379 static void vidosd_set_size(struct s3c_fb_win *win, u32 size)
 380 {
 381         struct s3c_fb *sfb = win->parent;
 382
 383         /* OSD can be set up if osd_size_off != 0 for this window */
 384         if (win->variant.osd_size_off)
 385                 writel(size, sfb->regs + OSD_BASE(win->index, sfb->variant)
 386                                 + win->variant.osd_size_off);
 387 }
 388
 389 /**
 390  * vidosd_set_alpha() - set alpha transparency for a window
 391  *
 392  * @win: the window to set OSD size for
 393  * @alpha: alpha register value
 394  */
 395 static void vidosd_set_alpha(struct s3c_fb_win *win, u32 alpha)
 396 {
 397         struct s3c_fb *sfb = win->parent;
 398
 399         if (win->variant.has_osd_alpha)
 400                 writel(alpha, sfb->regs + VIDOSD_C(win->index, sfb->variant));
 401 }
 402
 403 /**
 404  * shadow_protect_win() - disable updating values from shadow registers at vsync
 405  *
 406  * @win: window to protect registers for
 407  * @protect: 1 to protect (disable updates)
 408  */
 409 static void shadow_protect_win(struct s3c_fb_win *win, bool protect)
 410 {
 411         struct s3c_fb *sfb = win->parent;
 412         u32 reg;
 413
 414         if (protect) {
 415                 if (sfb->variant.has_prtcon) {
 416                         writel(PRTCON_PROTECT, sfb->regs + PRTCON);
 417                 } else if (sfb->variant.has_shadowcon) {
 418                         reg = readl(sfb->regs + SHADOWCON);
 419                         writel(reg | SHADOWCON_WINx_PROTECT(win->index),
 420                                 sfb->regs + SHADOWCON);
 421                 }
 422         } else {
 423                 if (sfb->variant.has_prtcon) {
 424                         writel(0, sfb->regs + PRTCON);
 425                 } else if (sfb->variant.has_shadowcon) {
 426                         reg = readl(sfb->regs + SHADOWCON);
 427                         writel(reg & ~SHADOWCON_WINx_PROTECT(win->index),
 428                                 sfb->regs + SHADOWCON);
 429                 }
 430         }
 431 }
 432
 433 /**
 434  * s3c_fb_set_par() - framebuffer request to set new framebuffer state.
 435  * @info: The framebuffer to change.
 436  *
 437  * Framebuffer layer request to set a new mode for the specified framebuffer
 438  */
 439 static int s3c_fb_set_par(struct fb_info *info)
 440 {
 441         struct fb_var_screeninfo *var = &info->var;
 442         struct s3c_fb_win *win = info->par;
 443         struct s3c_fb *sfb = win->parent;
 444         void __iomem *regs = sfb->regs;
 445         void __iomem *buf = regs;
 446         int win_no = win->index;
 447         u32 alpha = 0;
 448         u32 data;
 449         u32 pagewidth;
 450         int clkdiv;
 451
 452         dev_dbg(sfb->dev, "setting framebuffer parameters\n");
 453
 454         shadow_protect_win(win, 1);
 455
 456         switch (var->bits_per_pixel) {
 457         case 32:
 458         case 24:
 459         case 16:
 460         case 12:
 461                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 462                 break;
 463         case 8:
 464                 if (win->variant.palette_sz >= 256)
 465                         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 466                 else
 467                         info->fix.visual = FB_VISUAL_TRUECOLOR;
 468                 break;
 469         case 1:
 470                 info->fix.visual = FB_VISUAL_MONO01;
 471                 break;
 472         default:
 473                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 474                 break;
 475         }
 476
 477         info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
 478
 479         info->fix.xpanstep = info->var.xres_virtual > info->var.xres ? 1 : 0;
 480         info->fix.ypanstep = info->var.yres_virtual > info->var.yres ? 1 : 0;
 481
 482         /* disable the window whilst we update it */
 483         writel(0, regs + WINCON(win_no));
 484
 485         /* use platform specified window as the basis for the lcd timings */
 486
 487         if (win_no == sfb->pdata->default_win) {
 488                 clkdiv = s3c_fb_calc_pixclk(sfb, var->pixclock);
 489
 490                 data = sfb->pdata->vidcon0;
 491                 data &= ~(VIDCON0_CLKVAL_F_MASK | VIDCON0_CLKDIR);
 492
 493                 if (clkdiv > 1)
 494                         data |= VIDCON0_CLKVAL_F(clkdiv-1) | VIDCON0_CLKDIR;
 495                 else
 496                         data &= ~VIDCON0_CLKDIR;        /* 1:1 clock */
 497
 498                 /* write the timing data to the panel */
 499
 500                 if (sfb->variant.is_2443)
 501                         data |= (1 << 5);
 502
 503                 data |= VIDCON0_ENVID | VIDCON0_ENVID_F;
 504                 writel(data, regs + VIDCON0);
 505
 506                 data = VIDTCON0_VBPD(var->upper_margin - 1) |
 507                        VIDTCON0_VFPD(var->lower_margin - 1) |
 508                        VIDTCON0_VSPW(var->vsync_len - 1);
 509
 510                 writel(data, regs + sfb->variant.vidtcon);
 511
 512                 data = VIDTCON1_HBPD(var->left_margin - 1) |
 513                        VIDTCON1_HFPD(var->right_margin - 1) |
 514                        VIDTCON1_HSPW(var->hsync_len - 1);
 515
 516                 /* VIDTCON1 */
 517                 writel(data, regs + sfb->variant.vidtcon + 4);
 518
 519                 data = VIDTCON2_LINEVAL(var->yres - 1) |
 520                        VIDTCON2_HOZVAL(var->xres - 1);
 521                 writel(data, regs +sfb->variant.vidtcon + 8 );
 522         }
 523
 524         /* write the buffer address */
 525
 526         /* start and end registers stride is 8 */
 527         buf = regs + win_no * 8;
 528
 529         writel(info->fix.smem_start, buf + sfb->variant.buf_start);
 530
 531         data = info->fix.smem_start + info->fix.line_length * var->yres;
 532         writel(data, buf + sfb->variant.buf_end);
 533
 534         pagewidth = (var->xres * var->bits_per_pixel) >> 3;
 535         data = VIDW_BUF_SIZE_OFFSET(info->fix.line_length - pagewidth) |
 536                VIDW_BUF_SIZE_PAGEWIDTH(pagewidth);
 537         writel(data, regs + sfb->variant.buf_size + (win_no * 4));
 538
 539         /* write 'OSD' registers to control position of framebuffer */
 540
 541         data = VIDOSDxA_TOPLEFT_X(0) | VIDOSDxA_TOPLEFT_Y(0);
 542         writel(data, regs + VIDOSD_A(win_no, sfb->variant));
 543
 544         data = VIDOSDxB_BOTRIGHT_X(s3c_fb_align_word(var->bits_per_pixel,
 545                                                      var->xres - 1)) |
 546                VIDOSDxB_BOTRIGHT_Y(var->yres - 1);
 547
 548         writel(data, regs + VIDOSD_B(win_no, sfb->variant));
 549
 550         data = var->xres * var->yres;
 551
 552         alpha = VIDISD14C_ALPHA1_R(0xf) |
 553                 VIDISD14C_ALPHA1_G(0xf) |
 554                 VIDISD14C_ALPHA1_B(0xf);
 555
 556         vidosd_set_alpha(win, alpha);
 557         vidosd_set_size(win, data);
 558
 559         data = WINCONx_ENWIN;
 560
 561         /* note, since we have to round up the bits-per-pixel, we end up
 562          * relying on the bitfield information for r/g/b/a to work out
 563          * exactly which mode of operation is intended. */
 564
 565         switch (var->bits_per_pixel) {
 566         case 1:
 567                 data |= WINCON0_BPPMODE_1BPP;
 568                 data |= WINCONx_BITSWP;
 569                 data |= WINCONx_BURSTLEN_4WORD;
 570                 break;
 571         case 2:
 572                 data |= WINCON0_BPPMODE_2BPP;
 573                 data |= WINCONx_BITSWP;
 574                 data |= WINCONx_BURSTLEN_8WORD;
 575                 break;
 576         case 4:
 577                 data |= WINCON0_BPPMODE_4BPP;
 578                 data |= WINCONx_BITSWP;
 579                 data |= WINCONx_BURSTLEN_8WORD;
 580                 break;
 581         case 8:
 582                 if (var->transp.length != 0)
 583                         data |= WINCON1_BPPMODE_8BPP_1232;
 584                 else
 585                         data |= WINCON0_BPPMODE_8BPP_PALETTE;
 586                 data |= WINCONx_BURSTLEN_8WORD;
 587                 data |= WINCONx_BYTSWP;
 588                 break;
 589         case 16:
 590                 if (var->transp.length != 0)
 591                         data |= WINCON1_BPPMODE_16BPP_A1555;
 592                 else
 593                         data |= WINCON0_BPPMODE_16BPP_565;
 594                 data |= WINCONx_HAWSWP;
 595                 data |= WINCONx_BURSTLEN_16WORD;
 596                 break;
 597         case 24:
 598         case 32:
 599                 if (var->red.length == 6) {
 600                         if (var->transp.length != 0)
 601                                 data |= WINCON1_BPPMODE_19BPP_A1666;
 602                         else
 603                                 data |= WINCON1_BPPMODE_18BPP_666;
 604                 } else if (var->transp.length == 1)
 605                         data |= WINCON1_BPPMODE_25BPP_A1888
 606                                 | WINCON1_BLD_PIX;
 607                 else if (var->transp.length == 4)
 608                         data |= WINCON1_BPPMODE_28BPP_A4888
 609                                 | WINCON1_BLD_PIX | WINCON1_ALPHA_SEL;
 610                 else
 611                         data |= WINCON0_BPPMODE_24BPP_888;
 612
 613                 data |= WINCONx_WSWP;
 614                 data |= WINCONx_BURSTLEN_16WORD;
 615                 break;
 616         }
 617
 618         /* Enable the colour keying for the window below this one */
 619         if (win_no > 0) {
 620                 u32 keycon0_data = 0, keycon1_data = 0;
 621                 void __iomem *keycon = regs + sfb->variant.keycon;
 622
 623                 keycon0_data = ~(WxKEYCON0_KEYBL_EN |
 624                                 WxKEYCON0_KEYEN_F |
 625                                 WxKEYCON0_DIRCON) | WxKEYCON0_COMPKEY(0);
 626
 627                 keycon1_data = WxKEYCON1_COLVAL(0xffffff);
 628
 629                 keycon += (win_no - 1) * 8;
 630
 631                 writel(keycon0_data, keycon + WKEYCON0);
 632                 writel(keycon1_data, keycon + WKEYCON1);
 633         }
 634
 635         writel(data, regs + sfb->variant.wincon + (win_no * 4));
 636         writel(0x0, regs + sfb->variant.winmap + (win_no * 4));
 637
 638         /* Enable DMA channel for this window */
 639         if (sfb->variant.has_shadowcon) {
 640                 data = readl(sfb->regs + SHADOWCON);
 641                 data |= SHADOWCON_CHx_ENABLE(win_no);
 642                 writel(data, sfb->regs + SHADOWCON);
 643         }
 644
 645         shadow_protect_win(win, 0);
 646
 647         return 0;
 648 }
 649
 650 /**
 651  * s3c_fb_update_palette() - set or schedule a palette update.
 652  * @sfb: The hardware information.
 653  * @win: The window being updated.
 654  * @reg: The palette index being changed.
 655  * @value: The computed palette value.
 656  *
 657  * Change the value of a palette register, either by directly writing to
 658  * the palette (this requires the palette RAM to be disconnected from the
 659  * hardware whilst this is in progress) or schedule the update for later.
 660  *
 661  * At the moment, since we have no VSYNC interrupt support, we simply set
 662  * the palette entry directly.
 663  */
 664 static void s3c_fb_update_palette(struct s3c_fb *sfb,
 665                                   struct s3c_fb_win *win,
 666                                   unsigned int reg,
 667                                   u32 value)
 668 {
 669         void __iomem *palreg;
 670         u32 palcon;
 671
 672         palreg = sfb->regs + sfb->variant.palette[win->index];
 673
 674         dev_dbg(sfb->dev, "%s: win %d, reg %d (%p): %08x\n",
 675                 __func__, win->index, reg, palreg, value);
 676
 677         win->palette_buffer[reg] = value;
 678
 679         palcon = readl(sfb->regs + WPALCON);
 680         writel(palcon | WPALCON_PAL_UPDATE, sfb->regs + WPALCON);
 681
 682         if (win->variant.palette_16bpp)
 683                 writew(value, palreg + (reg * 2));
 684         else
 685                 writel(value, palreg + (reg * 4));
 686
 687         writel(palcon, sfb->regs + WPALCON);
 688 }
 689
 690 static inline unsigned int chan_to_field(unsigned int chan,
 691                                          struct fb_bitfield *bf)
 692 {
 693         chan &= 0xffff;
 694         chan >>= 16 - bf->length;
 695         return chan << bf->offset;
 696 }
 697
 698 /**
 699  * s3c_fb_setcolreg() - framebuffer layer request to change palette.
 700  * @regno: The palette index to change.
 701  * @red: The red field for the palette data.
 702  * @green: The green field for the palette data.
 703  * @blue: The blue field for the palette data.
 704  * @trans: The transparency (alpha) field for the palette data.
 705  * @info: The framebuffer being changed.
 706  */
 707 static int s3c_fb_setcolreg(unsigned regno,
 708                             unsigned red, unsigned green, unsigned blue,
 709                             unsigned transp, struct fb_info *info)
 710 {
 711         struct s3c_fb_win *win = info->par;
 712         struct s3c_fb *sfb = win->parent;
 713         unsigned int val;
 714
 715         dev_dbg(sfb->dev, "%s: win %d: %d => rgb=%d/%d/%d\n",
 716                 __func__, win->index, regno, red, green, blue);
 717
 718         switch (info->fix.visual) {
 719         case FB_VISUAL_TRUECOLOR:
 720                 /* true-colour, use pseudo-palette */
 721
 722                 if (regno < 16) {
 723                         u32 *pal = info->pseudo_palette;
 724
 725                         val  = chan_to_field(red,   &info->var.red);
 726                         val |= chan_to_field(green, &info->var.green);
 727                         val |= chan_to_field(blue,  &info->var.blue);
 728
 729                         pal[regno] = val;
 730                 }
 731                 break;
 732
 733         case FB_VISUAL_PSEUDOCOLOR:
 734                 if (regno < win->variant.palette_sz) {
 735                         val  = chan_to_field(red, &win->palette.r);
 736                         val |= chan_to_field(green, &win->palette.g);
 737                         val |= chan_to_field(blue, &win->palette.b);
 738
 739                         s3c_fb_update_palette(sfb, win, regno, val);
 740                 }
 741
 742                 break;
 743
 744         default:
 745                 return 1;       /* unknown type */
 746         }
 747
 748         return 0;
 749 }
 750
 751 /**
 752  * s3c_fb_enable() - Set the state of the main LCD output
 753  * @sfb: The main framebuffer state.
 754  * @enable: The state to set.
 755  */
 756 static void s3c_fb_enable(struct s3c_fb *sfb, int enable)
 757 {
 758         u32 vidcon0 = readl(sfb->regs + VIDCON0);
 759
 760         if (enable)
 761                 vidcon0 |= VIDCON0_ENVID | VIDCON0_ENVID_F;
 762         else {
 763                 /* see the note in the framebuffer datasheet about
 764                  * why you cannot take both of these bits down at the
 765                  * same time. */
 766
 767                 if (!(vidcon0 & VIDCON0_ENVID))
 768                         return;
 769
 770                 vidcon0 |= VIDCON0_ENVID;
 771                 vidcon0 &= ~VIDCON0_ENVID_F;
 772         }
 773
 774         writel(vidcon0, sfb->regs + VIDCON0);
 775 }
 776
 777 /**
 778  * s3c_fb_blank() - blank or unblank the given window
 779  * @blank_mode: The blank state from FB_BLANK_*
 780  * @info: The framebuffer to blank.
 781  *
 782  * Framebuffer layer request to change the power state.
 783  */
 784 static int s3c_fb_blank(int blank_mode, struct fb_info *info)
 785 {
 786         struct s3c_fb_win *win = info->par;
 787         struct s3c_fb *sfb = win->parent;
 788         unsigned int index = win->index;
 789         u32 wincon;
 790
 791         dev_dbg(sfb->dev, "blank mode %d\n", blank_mode);
 792
 793         wincon = readl(sfb->regs + sfb->variant.wincon + (index * 4));
 794
 795         switch (blank_mode) {
 796         case FB_BLANK_POWERDOWN:
 797                 wincon &= ~WINCONx_ENWIN;
 798                 sfb->enabled &= ~(1 << index);
 799                 /* fall through to FB_BLANK_NORMAL */
 800
 801         case FB_BLANK_NORMAL:
 802                 /* disable the DMA and display 0x0 (black) */
 803                 writel(WINxMAP_MAP | WINxMAP_MAP_COLOUR(0x0),
 804                        sfb->regs + sfb->variant.winmap + (index * 4));
 805                 break;
 806
 807         case FB_BLANK_UNBLANK:
 808                 writel(0x0, sfb->regs + sfb->variant.winmap + (index * 4));
 809                 wincon |= WINCONx_ENWIN;
 810                 sfb->enabled |= (1 << index);
 811                 break;
 812
 813         case FB_BLANK_VSYNC_SUSPEND:
 814         case FB_BLANK_HSYNC_SUSPEND:
 815         default:
 816                 return 1;
 817         }
 818
 819         writel(wincon, sfb->regs + sfb->variant.wincon + (index * 4));
 820
 821         /* Check the enabled state to see if we need to be running the
 822          * main LCD interface, as if there are no active windows then
 823          * it is highly likely that we also do not need to output
 824          * anything.
 825          */
 826
 827         /* We could do something like the following code, but the current
 828          * system of using framebuffer events means that we cannot make
 829          * the distinction between just window 0 being inactive and all
 830          * the windows being down.
 831          *
 832          * s3c_fb_enable(sfb, sfb->enabled ? 1 : 0);
 833         */
 834
 835         /* we're stuck with this until we can do something about overriding
 836          * the power control using the blanking event for a single fb.
 837          */
 838         if (index == sfb->pdata->default_win)
 839                 s3c_fb_enable(sfb, blank_mode != FB_BLANK_POWERDOWN ? 1 : 0);
 840
 841         return 0;
 842 }
 843
 844 /**
 845  * s3c_fb_pan_display() - Pan the display.
 846  *
 847  * Note that the offsets can be written to the device at any time, as their
 848  * values are latched at each vsync automatically. This also means that only
 849  * the last call to this function will have any effect on next vsync, but
 850  * there is no need to sleep waiting for it to prevent tearing.
 851  *
 852  * @var: The screen information to verify.
 853  * @info: The framebuffer device.
 854  */
 855 static int s3c_fb_pan_display(struct fb_var_screeninfo *var,
 856                               struct fb_info *info)
 857 {
 858         struct s3c_fb_win *win  = info->par;
 859         struct s3c_fb *sfb      = win->parent;
 860         void __iomem *buf       = sfb->regs + win->index * 8;
 861         unsigned int start_boff, end_boff;
 862
 863         /* Offset in bytes to the start of the displayed area */
 864         start_boff = var->yoffset * info->fix.line_length;
 865         /* X offset depends on the current bpp */
 866         if (info->var.bits_per_pixel >= 8) {
 867                 start_boff += var->xoffset * (info->var.bits_per_pixel >> 3);
 868         } else {
 869                 switch (info->var.bits_per_pixel) {
 870                 case 4:
 871                         start_boff += var->xoffset >> 1;
 872                         break;
 873                 case 2:
 874                         start_boff += var->xoffset >> 2;
 875                         break;
 876                 case 1:
 877                         start_boff += var->xoffset >> 3;
 878                         break;
 879                 default:
 880                         dev_err(sfb->dev, "invalid bpp\n");
 881                         return -EINVAL;
 882                 }
 883         }
 884         /* Offset in bytes to the end of the displayed area */
 885         end_boff = start_boff + var->yres * info->fix.line_length;
 886
 887         /* Temporarily turn off per-vsync update from shadow registers until
 888          * both start and end addresses are updated to prevent corruption */
 889         shadow_protect_win(win, 1);
 890
 891         writel(info->fix.smem_start + start_boff, buf + sfb->variant.buf_start);
 892         writel(info->fix.smem_start + end_boff, buf + sfb->variant.buf_end);
 893
 894         shadow_protect_win(win, 0);
 895
 896         return 0;
 897 }
 898
 899 /**
 900  * s3c_fb_enable_irq() - enable framebuffer interrupts
 901  * @sfb: main hardware state
 902  */
 903 static void s3c_fb_enable_irq(struct s3c_fb *sfb)
 904 {
 905         void __iomem *regs = sfb->regs;
 906         u32 irq_ctrl_reg;
 907
 908         if (!test_and_set_bit(S3C_FB_VSYNC_IRQ_EN, &sfb->irq_flags)) {
 909                 /* IRQ disabled, enable it */
 910                 irq_ctrl_reg = readl(regs + VIDINTCON0);
 911
 912                 irq_ctrl_reg |= VIDINTCON0_INT_ENABLE;
 913                 irq_ctrl_reg |= VIDINTCON0_INT_FRAME;
 914
 915                 irq_ctrl_reg &= ~VIDINTCON0_FRAMESEL0_MASK;
 916                 irq_ctrl_reg |= VIDINTCON0_FRAMESEL0_VSYNC;
 917                 irq_ctrl_reg &= ~VIDINTCON0_FRAMESEL1_MASK;
 918                 irq_ctrl_reg |= VIDINTCON0_FRAMESEL1_NONE;
 919
 920                 writel(irq_ctrl_reg, regs + VIDINTCON0);
 921         }
 922 }
 923
 924 /**
 925  * s3c_fb_disable_irq() - disable framebuffer interrupts
 926  * @sfb: main hardware state
 927  */
 928 static void s3c_fb_disable_irq(struct s3c_fb *sfb)
 929 {
 930         void __iomem *regs = sfb->regs;
 931         u32 irq_ctrl_reg;
 932
 933         if (test_and_clear_bit(S3C_FB_VSYNC_IRQ_EN, &sfb->irq_flags)) {
 934                 /* IRQ enabled, disable it */
 935                 irq_ctrl_reg = readl(regs + VIDINTCON0);
 936
 937                 irq_ctrl_reg &= ~VIDINTCON0_INT_FRAME;
 938                 irq_ctrl_reg &= ~VIDINTCON0_INT_ENABLE;
 939
 940                 writel(irq_ctrl_reg, regs + VIDINTCON0);
 941         }
 942 }
 943
 944 static irqreturn_t s3c_fb_irq(int irq, void *dev_id)
 945 {
 946         struct s3c_fb *sfb = dev_id;
 947         void __iomem  *regs = sfb->regs;
 948         u32 irq_sts_reg;
 949
 950         irq_sts_reg = readl(regs + VIDINTCON1);
 951
 952         if (irq_sts_reg & VIDINTCON1_INT_FRAME) {
 953
 954                 /* VSYNC interrupt, accept it */
 955                 writel(VIDINTCON1_INT_FRAME, regs + VIDINTCON1);
 956
 957                 sfb->vsync_info.count++;
 958                 wake_up_interruptible(&sfb->vsync_info.wait);
 959         }
 960
 961         /* We only support waiting for VSYNC for now, so it's safe
 962          * to always disable irqs here.
 963          */
 964         s3c_fb_disable_irq(sfb);
 965
 966         return IRQ_HANDLED;
 967 }
 968
 969 /**
 970  * s3c_fb_wait_for_vsync() - sleep until next VSYNC interrupt or timeout
 971  * @sfb: main hardware state
 972  * @crtc: head index.
 973  */
 974 static int s3c_fb_wait_for_vsync(struct s3c_fb *sfb, u32 crtc)
 975 {
 976         unsigned long count;
 977         int ret;
 978
 979         if (crtc != 0)
 980                 return -ENODEV;
 981
 982         count = sfb->vsync_info.count;
 983         s3c_fb_enable_irq(sfb);
 984         ret = wait_event_interruptible_timeout(sfb->vsync_info.wait,
 985                                        count != sfb->vsync_info.count,
 986                                        msecs_to_jiffies(VSYNC_TIMEOUT_MSEC));
 987         if (ret == 0)
 988                 return -ETIMEDOUT;
 989
 990         return 0;
 991 }
 992
 993 static int s3c_fb_ioctl(struct fb_info *info, unsigned int cmd,
 994                         unsigned long arg)
 995 {
 996         struct s3c_fb_win *win = info->par;
 997         struct s3c_fb *sfb = win->parent;
 998         int ret;
 999         u32 crtc;
1000
1001         switch (cmd) {
1002         case FBIO_WAITFORVSYNC:
1003                 if (get_user(crtc, (u32 __user *)arg)) {
1004                         ret = -EFAULT;
1005                         break;
1006                 }
1007
1008                 ret = s3c_fb_wait_for_vsync(sfb, crtc);
1009                 break;
1010         default:
1011                 ret = -ENOTTY;
1012         }
1013
1014         return ret;
1015 }
1016
1017 static int s3c_fb_open(struct fb_info *info, int user)
1018 {
1019         struct s3c_fb_win *win = info->par;
1020         struct s3c_fb *sfb = win->parent;
1021
1022         pm_runtime_get_sync(sfb->dev);
1023
1024         return 0;
1025 }
1026
1027 static int s3c_fb_release(struct fb_info *info, int user)
1028 {
1029         struct s3c_fb_win *win = info->par;
1030         struct s3c_fb *sfb = win->parent;
1031
1032         pm_runtime_put_sync(sfb->dev);
1033
1034         return 0;
1035 }
1036
1037 static struct fb_ops s3c_fb_ops = {
1038         .owner          = THIS_MODULE,
1039         .fb_open        = s3c_fb_open,
1040         .fb_release     = s3c_fb_release,
1041         .fb_check_var   = s3c_fb_check_var,
1042         .fb_set_par     = s3c_fb_set_par,
1043         .fb_blank       = s3c_fb_blank,
1044         .fb_setcolreg   = s3c_fb_setcolreg,
1045         .fb_fillrect    = cfb_fillrect,
1046         .fb_copyarea    = cfb_copyarea,
1047         .fb_imageblit   = cfb_imageblit,
1048         .fb_pan_display = s3c_fb_pan_display,
1049         .fb_ioctl       = s3c_fb_ioctl,
1050 };
1051
1052 /**
1053  * s3c_fb_missing_pixclock() - calculates pixel clock
1054  * @mode: The video mode to change.
1055  *
1056  * Calculate the pixel clock when none has been given through platform data.
1057  */
1058 static void __devinit s3c_fb_missing_pixclock(struct fb_videomode *mode)
1059 {
1060         u64 pixclk = 1000000000000ULL;
1061         u32 div;
1062
1063         div  = mode->left_margin + mode->hsync_len + mode->right_margin +
1064                mode->xres;
1065         div *= mode->upper_margin + mode->vsync_len + mode->lower_margin +
1066                mode->yres;
1067         div *= mode->refresh ? : 60;
1068
1069         do_div(pixclk, div);
1070
1071         mode->pixclock = pixclk;
1072 }
1073
1074 /**
1075  * s3c_fb_alloc_memory() - allocate display memory for framebuffer window
1076  * @sfb: The base resources for the hardware.
1077  * @win: The window to initialise memory for.
1078  *
1079  * Allocate memory for the given framebuffer.
1080  */
1081 static int __devinit s3c_fb_alloc_memory(struct s3c_fb *sfb,
1082                                          struct s3c_fb_win *win)
1083 {
1084         struct s3c_fb_pd_win *windata = win->windata;
1085         unsigned int real_size, virt_size, size;
1086         struct fb_info *fbi = win->fbinfo;
1087         dma_addr_t map_dma;
1088
1089         dev_dbg(sfb->dev, "allocating memory for display\n");
1090
1091         real_size = windata->win_mode.xres * windata->win_mode.yres;
1092         virt_size = windata->virtual_x * windata->virtual_y;
1093
1094         dev_dbg(sfb->dev, "real_size=%u (%u.%u), virt_size=%u (%u.%u)\n",
1095                 real_size, windata->win_mode.xres, windata->win_mode.yres,
1096                 virt_size, windata->virtual_x, windata->virtual_y);
1097
1098         size = (real_size > virt_size) ? real_size : virt_size;
1099         size *= (windata->max_bpp > 16) ? 32 : windata->max_bpp;
1100         size /= 8;
1101
1102         fbi->fix.smem_len = size;
1103         size = PAGE_ALIGN(size);
1104
1105         dev_dbg(sfb->dev, "want %u bytes for window\n", size);
1106
1107         fbi->screen_base = dma_alloc_writecombine(sfb->dev, size,
1108                                                   &map_dma, GFP_KERNEL);
1109         if (!fbi->screen_base)
1110                 return -ENOMEM;
1111
1112         dev_dbg(sfb->dev, "mapped %x to %p\n",
1113                 (unsigned int)map_dma, fbi->screen_base);
1114
1115         memset(fbi->screen_base, 0x0, size);
1116         fbi->fix.smem_start = map_dma;
1117
1118         return 0;
1119 }
1120
1121 /**
1122  * s3c_fb_free_memory() - free the display memory for the given window
1123  * @sfb: The base resources for the hardware.
1124  * @win: The window to free the display memory for.
1125  *
1126  * Free the display memory allocated by s3c_fb_alloc_memory().
1127  */
1128 static void s3c_fb_free_memory(struct s3c_fb *sfb, struct s3c_fb_win *win)
1129 {
1130         struct fb_info *fbi = win->fbinfo;
1131
1132         if (fbi->screen_base)
1133                 dma_free_writecombine(sfb->dev, PAGE_ALIGN(fbi->fix.smem_len),
1134                               fbi->screen_base, fbi->fix.smem_start);
1135 }
1136
1137 /**
1138  * s3c_fb_release_win() - release resources for a framebuffer window.
1139  * @win: The window to cleanup the resources for.
1140  *
1141  * Release the resources that where claimed for the hardware window,
1142  * such as the framebuffer instance and any memory claimed for it.
1143  */
1144 static void s3c_fb_release_win(struct s3c_fb *sfb, struct s3c_fb_win *win)
1145 {
1146         u32 data;
1147
1148         if (win->fbinfo) {
1149                 if (sfb->variant.has_shadowcon) {
1150                         data = readl(sfb->regs + SHADOWCON);
1151                         data &= ~SHADOWCON_CHx_ENABLE(win->index);
1152                         data &= ~SHADOWCON_CHx_LOCAL_ENABLE(win->index);
1153                         writel(data, sfb->regs + SHADOWCON);
1154                 }
1155                 unregister_framebuffer(win->fbinfo);
1156                 if (win->fbinfo->cmap.len)
1157                         fb_dealloc_cmap(&win->fbinfo->cmap);
1158                 s3c_fb_free_memory(sfb, win);
1159                 framebuffer_release(win->fbinfo);
1160         }
1161 }
1162
1163 /**
1164  * s3c_fb_probe_win() - register an hardware window
1165  * @sfb: The base resources for the hardware
1166  * @variant: The variant information for this window.
1167  * @res: Pointer to where to place the resultant window.
1168  *
1169  * Allocate and do the basic initialisation for one of the hardware's graphics
1170  * windows.
1171  */
1172 static int __devinit s3c_fb_probe_win(struct s3c_fb *sfb, unsigned int win_no,
1173                                       struct s3c_fb_win_variant *variant,
1174                                       struct s3c_fb_win **res)
1175 {
1176         struct fb_var_screeninfo *var;
1177         struct fb_videomode *initmode;
1178         struct s3c_fb_pd_win *windata;
1179         struct s3c_fb_win *win;
1180         struct fb_info *fbinfo;
1181         int palette_size;
1182         int ret;
1183
1184         dev_dbg(sfb->dev, "probing window %d, variant %p\n", win_no, variant);
1185
1186         init_waitqueue_head(&sfb->vsync_info.wait);
1187
1188         palette_size = variant->palette_sz * 4;
1189
1190         fbinfo = framebuffer_alloc(sizeof(struct s3c_fb_win) +
1191                                    palette_size * sizeof(u32), sfb->dev);
1192         if (!fbinfo) {
1193                 dev_err(sfb->dev, "failed to allocate framebuffer\n");
1194                 return -ENOENT;
1195         }
1196
1197         windata = sfb->pdata->win[win_no];
1198         initmode = &windata->win_mode;
1199
1200         WARN_ON(windata->max_bpp == 0);
1201         WARN_ON(windata->win_mode.xres == 0);
1202         WARN_ON(windata->win_mode.yres == 0);
1203
1204         win = fbinfo->par;
1205         *res = win;
1206         var = &fbinfo->var;
1207         win->variant = *variant;
1208         win->fbinfo = fbinfo;
1209         win->parent = sfb;
1210         win->windata = windata;
1211         win->index = win_no;
1212         win->palette_buffer = (u32 *)(win + 1);
1213
1214         ret = s3c_fb_alloc_memory(sfb, win);
1215         if (ret) {
1216                 dev_err(sfb->dev, "failed to allocate display memory\n");
1217                 return ret;
1218         }
1219
1220         /* setup the r/b/g positions for the window's palette */
1221         if (win->variant.palette_16bpp) {
1222                 /* Set RGB 5:6:5 as default */
1223                 win->palette.r.offset = 11;
1224                 win->palette.r.length = 5;
1225                 win->palette.g.offset = 5;
1226                 win->palette.g.length = 6;
1227                 win->palette.b.offset = 0;
1228                 win->palette.b.length = 5;
1229
1230         } else {
1231                 /* Set 8bpp or 8bpp and 1bit alpha */
1232                 win->palette.r.offset = 16;
1233                 win->palette.r.length = 8;
1234                 win->palette.g.offset = 8;
1235                 win->palette.g.length = 8;
1236                 win->palette.b.offset = 0;
1237                 win->palette.b.length = 8;
1238         }
1239
1240         /* setup the initial video mode from the window */
1241         fb_videomode_to_var(&fbinfo->var, initmode);
1242
1243         fbinfo->fix.type        = FB_TYPE_PACKED_PIXELS;
1244         fbinfo->fix.accel       = FB_ACCEL_NONE;
1245         fbinfo->var.activate    = FB_ACTIVATE_NOW;
1246         fbinfo->var.vmode       = FB_VMODE_NONINTERLACED;
1247         fbinfo->var.bits_per_pixel = windata->default_bpp;
1248         fbinfo->fbops           = &s3c_fb_ops;
1249         fbinfo->flags           = FBINFO_FLAG_DEFAULT;
1250         fbinfo->pseudo_palette  = &win->pseudo_palette;
1251
1252         /* prepare to actually start the framebuffer */
1253
1254         ret = s3c_fb_check_var(&fbinfo->var, fbinfo);
1255         if (ret < 0) {
1256                 dev_err(sfb->dev, "check_var failed on initial video params\n");
1257                 return ret;
1258         }
1259
1260         /* create initial colour map */
1261
1262         ret = fb_alloc_cmap(&fbinfo->cmap, win->variant.palette_sz, 1);
1263         if (ret == 0)
1264                 fb_set_cmap(&fbinfo->cmap, fbinfo);
1265         else
1266                 dev_err(sfb->dev, "failed to allocate fb cmap\n");
1267
1268         s3c_fb_set_par(fbinfo);
1269
1270         dev_dbg(sfb->dev, "about to register framebuffer\n");
1271
1272         /* run the check_var and set_par on our configuration. */
1273
1274         ret = register_framebuffer(fbinfo);
1275         if (ret < 0) {
1276                 dev_err(sfb->dev, "failed to register framebuffer\n");
1277                 return ret;
1278         }
1279
1280         dev_info(sfb->dev, "window %d: fb %s\n", win_no, fbinfo->fix.id);
1281
1282         return 0;
1283 }
1284
1285 /**
1286  * s3c_fb_clear_win() - clear hardware window registers.
1287  * @sfb: The base resources for the hardware.
1288  * @win: The window to process.
1289  *
1290  * Reset the specific window registers to a known state.
1291  */
1292 static void s3c_fb_clear_win(struct s3c_fb *sfb, int win)
1293 {
1294         void __iomem *regs = sfb->regs;
1295         u32 reg;
1296
1297         writel(0, regs + sfb->variant.wincon + (win * 4));
1298         writel(0, regs + VIDOSD_A(win, sfb->variant));
1299         writel(0, regs + VIDOSD_B(win, sfb->variant));
1300         writel(0, regs + VIDOSD_C(win, sfb->variant));
1301         reg = readl(regs + SHADOWCON);
1302         writel(reg & ~SHADOWCON_WINx_PROTECT(win), regs + SHADOWCON);
1303 }
1304
1305 static int __devinit s3c_fb_probe(struct platform_device *pdev)
1306 {
1307         struct s3c_fb_driverdata *fbdrv;
1308         struct device *dev = &pdev->dev;
1309         struct s3c_fb_platdata *pd;
1310         struct s3c_fb *sfb;
1311         struct resource *res;
1312         int win;
1313         int ret = 0;
1314
1315         fbdrv = (struct s3c_fb_driverdata *)platform_get_device_id(pdev)->driver_data;
1316
1317         if (fbdrv->variant.nr_windows > S3C_FB_MAX_WIN) {
1318                 dev_err(dev, "too many windows, cannot attach\n");
1319                 return -EINVAL;
1320         }
1321
1322         pd = pdev->dev.platform_data;
1323         if (!pd) {
1324                 dev_err(dev, "no platform data specified\n");
1325                 return -EINVAL;
1326         }
1327
1328         sfb = kzalloc(sizeof(struct s3c_fb), GFP_KERNEL);
1329         if (!sfb) {
1330                 dev_err(dev, "no memory for framebuffers\n");
1331                 return -ENOMEM;
1332         }
1333
1334         dev_dbg(dev, "allocate new framebuffer %p\n", sfb);
1335
1336         sfb->dev = dev;
1337         sfb->pdata = pd;
1338         sfb->variant = fbdrv->variant;
1339
1340         sfb->bus_clk = clk_get(dev, "lcd");
1341         if (IS_ERR(sfb->bus_clk)) {
1342                 dev_err(dev, "failed to get bus clock\n");
1343                 ret = PTR_ERR(sfb->bus_clk);
1344                 goto err_sfb;
1345         }
1346
1347         clk_enable(sfb->bus_clk);
1348
1349         pm_runtime_enable(sfb->dev);
1350
1351         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1352         if (!res) {
1353                 dev_err(dev, "failed to find registers\n");
1354                 ret = -ENOENT;
1355                 goto err_clk;
1356         }
1357
1358         sfb->regs_res = request_mem_region(res->start, resource_size(res),
1359                                            dev_name(dev));
1360         if (!sfb->regs_res) {
1361                 dev_err(dev, "failed to claim register region\n");
1362                 ret = -ENOENT;
1363                 goto err_clk;
1364         }
1365
1366         sfb->regs = ioremap(res->start, resource_size(res));
1367         if (!sfb->regs) {
1368                 dev_err(dev, "failed to map registers\n");
1369                 ret = -ENXIO;
1370                 goto err_req_region;
1371         }
1372
1373         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1374         if (!res) {
1375                 dev_err(dev, "failed to acquire irq resource\n");
1376                 ret = -ENOENT;
1377                 goto err_ioremap;
1378         }
1379         sfb->irq_no = res->start;
1380         ret = request_irq(sfb->irq_no, s3c_fb_irq,
1381                           0, "s3c_fb", sfb);
1382         if (ret) {
1383                 dev_err(dev, "irq request failed\n");
1384                 goto err_ioremap;
1385         }
1386
1387         dev_dbg(dev, "got resources (regs %p), probing windows\n", sfb->regs);
1388
1389         platform_set_drvdata(pdev, sfb);
1390         pm_runtime_get_sync(sfb->dev);
1391
1392         /* setup gpio and output polarity controls */
1393
1394         pd->setup_gpio();
1395
1396         writel(pd->vidcon1, sfb->regs + VIDCON1);
1397
1398         /* zero all windows before we do anything */
1399
1400         for (win = 0; win < fbdrv->variant.nr_windows; win++)
1401                 s3c_fb_clear_win(sfb, win);
1402
1403         /* initialise colour key controls */
1404         for (win = 0; win < (fbdrv->variant.nr_windows - 1); win++) {
1405                 void __iomem *regs = sfb->regs + sfb->variant.keycon;
1406
1407                 regs += (win * 8);
1408                 writel(0xffffff, regs + WKEYCON0);
1409                 writel(0xffffff, regs + WKEYCON1);
1410         }
1411
1412         /* we have the register setup, start allocating framebuffers */
1413
1414         for (win = 0; win < fbdrv->variant.nr_windows; win++) {
1415                 if (!pd->win[win])
1416                         continue;
1417
1418                 if (!pd->win[win]->win_mode.pixclock)
1419                         s3c_fb_missing_pixclock(&pd->win[win]->win_mode);
1420
1421                 ret = s3c_fb_probe_win(sfb, win, fbdrv->win[win],
1422                                        &sfb->windows[win]);
1423                 if (ret < 0) {
1424                         dev_err(dev, "failed to create window %d\n", win);
1425                         for (; win >= 0; win--)
1426                                 s3c_fb_release_win(sfb, sfb->windows[win]);
1427                         goto err_irq;
1428                 }
1429         }
1430
1431         platform_set_drvdata(pdev, sfb);
1432         pm_runtime_put_sync(sfb->dev);
1433
1434         return 0;
1435
1436 err_irq:
1437         free_irq(sfb->irq_no, sfb);
1438
1439 err_ioremap:
1440         iounmap(sfb->regs);
1441
1442 err_req_region:
1443         release_resource(sfb->regs_res);
1444         kfree(sfb->regs_res);
1445
1446 err_clk:
1447         clk_disable(sfb->bus_clk);
1448         clk_put(sfb->bus_clk);
1449
1450 err_sfb:
1451         kfree(sfb);
1452         return ret;
1453 }
1454
1455 /**
1456  * s3c_fb_remove() - Cleanup on module finalisation
1457  * @pdev: The platform device we are bound to.
1458  *
1459  * Shutdown and then release all the resources that the driver allocated
1460  * on initialisation.
1461  */
1462 static int __devexit s3c_fb_remove(struct platform_device *pdev)
1463 {
1464         struct s3c_fb *sfb = platform_get_drvdata(pdev);
1465         int win;
1466
1467         pm_runtime_get_sync(sfb->dev);
1468
1469         for (win = 0; win < S3C_FB_MAX_WIN; win++)
1470                 if (sfb->windows[win])
1471                         s3c_fb_release_win(sfb, sfb->windows[win]);
1472
1473         free_irq(sfb->irq_no, sfb);
1474
1475         iounmap(sfb->regs);
1476
1477         clk_disable(sfb->bus_clk);
1478         clk_put(sfb->bus_clk);
1479
1480         release_resource(sfb->regs_res);
1481         kfree(sfb->regs_res);
1482
1483         kfree(sfb);
1484
1485         pm_runtime_put_sync(sfb->dev);
1486         pm_runtime_disable(sfb->dev);
1487
1488         return 0;
1489 }
1490
1491 #ifdef CONFIG_PM
1492 static int s3c_fb_suspend(struct device *dev)
1493 {
1494         struct platform_device *pdev = to_platform_device(dev);
1495         struct s3c_fb *sfb = platform_get_drvdata(pdev);
1496         struct s3c_fb_win *win;
1497         int win_no;
1498
1499         for (win_no = S3C_FB_MAX_WIN - 1; win_no >= 0; win_no--) {
1500                 win = sfb->windows[win_no];
1501                 if (!win)
1502                         continue;
1503
1504                 /* use the blank function to push into power-down */
1505                 s3c_fb_blank(FB_BLANK_POWERDOWN, win->fbinfo);
1506         }
1507
1508         clk_disable(sfb->bus_clk);
1509         return 0;
1510 }
1511
1512 static int s3c_fb_resume(struct device *dev)
1513 {
1514         struct platform_device *pdev = to_platform_device(dev);
1515         struct s3c_fb *sfb = platform_get_drvdata(pdev);
1516         struct s3c_fb_platdata *pd = sfb->pdata;
1517         struct s3c_fb_win *win;
1518         int win_no;
1519
1520         clk_enable(sfb->bus_clk);
1521
1522         /* setup registers */
1523         writel(pd->vidcon1, sfb->regs + VIDCON1);
1524
1525         /* zero all windows before we do anything */
1526         for (win_no = 0; win_no < sfb->variant.nr_windows; win_no++)
1527                 s3c_fb_clear_win(sfb, win_no);
1528
1529         for (win_no = 0; win_no < sfb->variant.nr_windows - 1; win_no++) {
1530                 void __iomem *regs = sfb->regs + sfb->variant.keycon;
1531
1532                 regs += (win_no * 8);
1533                 writel(0xffffff, regs + WKEYCON0);
1534                 writel(0xffffff, regs + WKEYCON1);
1535         }
1536
1537         /* restore framebuffers */
1538         for (win_no = 0; win_no < S3C_FB_MAX_WIN; win_no++) {
1539                 win = sfb->windows[win_no];
1540                 if (!win)
1541                         continue;
1542
1543                 dev_dbg(&pdev->dev, "resuming window %d\n", win_no);
1544                 s3c_fb_set_par(win->fbinfo);
1545         }
1546
1547         return 0;
1548 }
1549
1550 int s3c_fb_runtime_suspend(struct device *dev)
1551 {
1552         struct platform_device *pdev = to_platform_device(dev);
1553         struct s3c_fb *sfb = platform_get_drvdata(pdev);
1554         struct s3c_fb_win *win;
1555         int win_no;
1556
1557         for (win_no = S3C_FB_MAX_WIN - 1; win_no >= 0; win_no--) {
1558                 win = sfb->windows[win_no];
1559                 if (!win)
1560                         continue;
1561
1562                 /* use the blank function to push into power-down */
1563                 s3c_fb_blank(FB_BLANK_POWERDOWN, win->fbinfo);
1564         }
1565
1566         clk_disable(sfb->bus_clk);
1567         return 0;
1568 }
1569
1570 int s3c_fb_runtime_resume(struct device *dev)
1571 {
1572         struct platform_device *pdev = to_platform_device(dev);
1573         struct s3c_fb *sfb = platform_get_drvdata(pdev);
1574         struct s3c_fb_platdata *pd = sfb->pdata;
1575         struct s3c_fb_win *win;
1576         int win_no;
1577
1578         clk_enable(sfb->bus_clk);
1579
1580         /* setup registers */
1581         writel(pd->vidcon1, sfb->regs + VIDCON1);
1582
1583         /* zero all windows before we do anything */
1584         for (win_no = 0; win_no < sfb->variant.nr_windows; win_no++)
1585                 s3c_fb_clear_win(sfb, win_no);
1586
1587         for (win_no = 0; win_no < sfb->variant.nr_windows - 1; win_no++) {
1588                 void __iomem *regs = sfb->regs + sfb->variant.keycon;
1589
1590                 regs += (win_no * 8);
1591                 writel(0xffffff, regs + WKEYCON0);
1592                 writel(0xffffff, regs + WKEYCON1);
1593         }
1594
1595         /* restore framebuffers */
1596         for (win_no = 0; win_no < S3C_FB_MAX_WIN; win_no++) {
1597                 win = sfb->windows[win_no];
1598                 if (!win)
1599                         continue;
1600
1601                 dev_dbg(&pdev->dev, "resuming window %d\n", win_no);
1602                 s3c_fb_set_par(win->fbinfo);
1603         }
1604
1605         return 0;
1606 }
1607
1608 #else
1609 #define s3c_fb_suspend NULL
1610 #define s3c_fb_resume  NULL
1611 #define s3c_fb_runtime_suspend NULL
1612 #define s3c_fb_runtime_resume NULL
1613 #endif
1614
1615
1616 #define VALID_BPP124 (VALID_BPP(1) | VALID_BPP(2) | VALID_BPP(4))
1617 #define VALID_BPP1248 (VALID_BPP124 | VALID_BPP(8))
1618
1619 static struct s3c_fb_win_variant s3c_fb_data_64xx_wins[] = {
1620         [0] = {
1621                 .has_osd_c      = 1,
1622                 .osd_size_off   = 0x8,
1623                 .palette_sz     = 256,
1624                 .valid_bpp      = VALID_BPP1248 | VALID_BPP(16) | VALID_BPP(24),
1625         },
1626         [1] = {
1627                 .has_osd_c      = 1,
1628                 .has_osd_d      = 1,
1629                 .osd_size_off   = 0x12,
1630                 .has_osd_alpha  = 1,
1631                 .palette_sz     = 256,
1632                 .valid_bpp      = (VALID_BPP1248 | VALID_BPP(16) |
1633                                    VALID_BPP(18) | VALID_BPP(19) |
1634                                    VALID_BPP(24) | VALID_BPP(25)),
1635         },
1636         [2] = {
1637                 .has_osd_c      = 1,
1638                 .has_osd_d      = 1,
1639                 .osd_size_off   = 0x12,
1640                 .has_osd_alpha  = 1,
1641                 .palette_sz     = 16,
1642                 .palette_16bpp  = 1,
1643                 .valid_bpp      = (VALID_BPP1248 | VALID_BPP(16) |
1644                                    VALID_BPP(18) | VALID_BPP(19) |
1645                                    VALID_BPP(24) | VALID_BPP(25)),
1646         },
1647         [3] = {
1648                 .has_osd_c      = 1,
1649                 .has_osd_alpha  = 1,
1650                 .palette_sz     = 16,
1651                 .palette_16bpp  = 1,
1652                 .valid_bpp      = (VALID_BPP124  | VALID_BPP(16) |
1653                                    VALID_BPP(18) | VALID_BPP(19) |
1654                                    VALID_BPP(24) | VALID_BPP(25)),
1655         },
1656         [4] = {
1657                 .has_osd_c      = 1,
1658                 .has_osd_alpha  = 1,
1659                 .palette_sz     = 4,
1660                 .palette_16bpp  = 1,
1661                 .valid_bpp      = (VALID_BPP(1) | VALID_BPP(2) |
1662                                    VALID_BPP(16) | VALID_BPP(18) |
1663                                    VALID_BPP(24) | VALID_BPP(25)),
1664         },
1665 };
1666
1667 static struct s3c_fb_driverdata s3c_fb_data_64xx = {
1668         .variant = {
1669                 .nr_windows     = 5,
1670                 .vidtcon        = VIDTCON0,
1671                 .wincon         = WINCON(0),
1672                 .winmap         = WINxMAP(0),
1673                 .keycon         = WKEYCON,
1674                 .osd            = VIDOSD_BASE,
1675                 .osd_stride     = 16,
1676                 .buf_start      = VIDW_BUF_START(0),
1677                 .buf_size       = VIDW_BUF_SIZE(0),
1678                 .buf_end        = VIDW_BUF_END(0),
1679
1680                 .palette = {
1681                         [0] = 0x400,
1682                         [1] = 0x800,
1683                         [2] = 0x300,
1684                         [3] = 0x320,
1685                         [4] = 0x340,
1686                 },
1687
1688                 .has_prtcon     = 1,
1689         },
1690         .win[0] = &s3c_fb_data_64xx_wins[0],
1691         .win[1] = &s3c_fb_data_64xx_wins[1],
1692         .win[2] = &s3c_fb_data_64xx_wins[2],
1693         .win[3] = &s3c_fb_data_64xx_wins[3],
1694         .win[4] = &s3c_fb_data_64xx_wins[4],
1695 };
1696
1697 static struct s3c_fb_driverdata s3c_fb_data_s5pc100 = {
1698         .variant = {
1699                 .nr_windows     = 5,
1700                 .vidtcon        = VIDTCON0,
1701                 .wincon         = WINCON(0),
1702                 .winmap         = WINxMAP(0),
1703                 .keycon         = WKEYCON,
1704                 .osd            = VIDOSD_BASE,
1705                 .osd_stride     = 16,
1706                 .buf_start      = VIDW_BUF_START(0),
1707                 .buf_size       = VIDW_BUF_SIZE(0),
1708                 .buf_end        = VIDW_BUF_END(0),
1709
1710                 .palette = {
1711                         [0] = 0x2400,
1712                         [1] = 0x2800,
1713                         [2] = 0x2c00,
1714                         [3] = 0x3000,
1715                         [4] = 0x3400,
1716                 },
1717
1718                 .has_prtcon     = 1,
1719         },
1720         .win[0] = &s3c_fb_data_64xx_wins[0],
1721         .win[1] = &s3c_fb_data_64xx_wins[1],
1722         .win[2] = &s3c_fb_data_64xx_wins[2],
1723         .win[3] = &s3c_fb_data_64xx_wins[3],
1724         .win[4] = &s3c_fb_data_64xx_wins[4],
1725 };
1726
1727 static struct s3c_fb_driverdata s3c_fb_data_s5pv210 = {
1728         .variant = {
1729                 .nr_windows     = 5,
1730                 .vidtcon        = VIDTCON0,
1731                 .wincon         = WINCON(0),
1732                 .winmap         = WINxMAP(0),
1733                 .keycon         = WKEYCON,
1734                 .osd            = VIDOSD_BASE,
1735                 .osd_stride     = 16,
1736                 .buf_start      = VIDW_BUF_START(0),
1737                 .buf_size       = VIDW_BUF_SIZE(0),
1738                 .buf_end        = VIDW_BUF_END(0),
1739
1740                 .palette = {
1741                         [0] = 0x2400,
1742                         [1] = 0x2800,
1743                         [2] = 0x2c00,
1744                         [3] = 0x3000,
1745                         [4] = 0x3400,
1746                 },
1747
1748                 .has_shadowcon  = 1,
1749         },
1750         .win[0] = &s3c_fb_data_64xx_wins[0],
1751         .win[1] = &s3c_fb_data_64xx_wins[1],
1752         .win[2] = &s3c_fb_data_64xx_wins[2],
1753         .win[3] = &s3c_fb_data_64xx_wins[3],
1754         .win[4] = &s3c_fb_data_64xx_wins[4],
1755 };
1756
1757 /* S3C2443/S3C2416 style hardware */
1758 static struct s3c_fb_driverdata s3c_fb_data_s3c2443 = {
1759         .variant = {
1760                 .nr_windows     = 2,
1761                 .is_2443        = 1,
1762
1763                 .vidtcon        = 0x08,
1764                 .wincon         = 0x14,
1765                 .winmap         = 0xd0,
1766                 .keycon         = 0xb0,
1767                 .osd            = 0x28,
1768                 .osd_stride     = 12,
1769                 .buf_start      = 0x64,
1770                 .buf_size       = 0x94,
1771                 .buf_end        = 0x7c,
1772
1773                 .palette = {
1774                         [0] = 0x400,
1775                         [1] = 0x800,
1776                 },
1777         },
1778         .win[0] = &(struct s3c_fb_win_variant) {
1779                 .palette_sz     = 256,
1780                 .valid_bpp      = VALID_BPP1248 | VALID_BPP(16) | VALID_BPP(24),
1781         },
1782         .win[1] = &(struct s3c_fb_win_variant) {
1783                 .has_osd_c      = 1,
1784                 .has_osd_alpha  = 1,
1785                 .palette_sz     = 256,
1786                 .valid_bpp      = (VALID_BPP1248 | VALID_BPP(16) |
1787                                    VALID_BPP(18) | VALID_BPP(19) |
1788                                    VALID_BPP(24) | VALID_BPP(25) |
1789                                    VALID_BPP(28)),
1790         },
1791 };
1792
1793 static struct platform_device_id s3c_fb_driver_ids[] = {
1794         {
1795                 .name           = "s3c-fb",
1796                 .driver_data    = (unsigned long)&s3c_fb_data_64xx,
1797         }, {
1798                 .name           = "s5pc100-fb",
1799                 .driver_data    = (unsigned long)&s3c_fb_data_s5pc100,
1800         }, {
1801                 .name           = "s5pv210-fb",
1802                 .driver_data    = (unsigned long)&s3c_fb_data_s5pv210,
1803         }, {
1804                 .name           = "s3c2443-fb",
1805                 .driver_data    = (unsigned long)&s3c_fb_data_s3c2443,
1806         },
1807         {},
1808 };
1809 MODULE_DEVICE_TABLE(platform, s3c_fb_driver_ids);
1810
1811 static const struct dev_pm_ops s3cfb_pm_ops = {
1812         .suspend        = s3c_fb_suspend,
1813         .resume         = s3c_fb_resume,
1814         .runtime_suspend        = s3c_fb_runtime_suspend,
1815         .runtime_resume         = s3c_fb_runtime_resume,
1816 };
1817
1818 static struct platform_driver s3c_fb_driver = {
1819         .probe          = s3c_fb_probe,
1820         .remove         = __devexit_p(s3c_fb_remove),
1821         .id_table       = s3c_fb_driver_ids,
1822         .driver         = {
1823                 .name   = "s3c-fb",
1824                 .owner  = THIS_MODULE,
1825                 .pm     = &s3cfb_pm_ops,
1826         },
1827 };
1828
1829 static int __init s3c_fb_init(void)
1830 {
1831         return platform_driver_register(&s3c_fb_driver);
1832 }
1833
1834 static void __exit s3c_fb_cleanup(void)
1835 {
1836         platform_driver_unregister(&s3c_fb_driver);
1837 }
1838
1839 module_init(s3c_fb_init);
1840 module_exit(s3c_fb_cleanup);
1841
1842 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
1843 MODULE_DESCRIPTION("Samsung S3C SoC Framebuffer driver");
1844 MODULE_LICENSE("GPL");
1845 MODULE_ALIAS("platform:s3c-fb");