drivers/video/sm501fb.c

   1 /* linux/drivers/video/sm501fb.c
   2  *
   3  * Copyright (c) 2006 Simtec Electronics
   4  *      Vincent Sanders <vince@simtec.co.uk>
   5  *      Ben Dooks <ben@simtec.co.uk>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * Framebuffer driver for the Silicon Motion SM501
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/errno.h>
  17 #include <linux/string.h>
  18 #include <linux/mm.h>
  19 #include <linux/tty.h>
  20 #include <linux/slab.h>
  21 #include <linux/delay.h>
  22 #include <linux/fb.h>
  23 #include <linux/init.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/workqueue.h>
  28 #include <linux/wait.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/clk.h>
  31 #include <linux/console.h>
  32
  33 #include <asm/io.h>
  34 #include <asm/uaccess.h>
  35 #include <asm/div64.h>
  36
  37 #ifdef CONFIG_PM
  38 #include <linux/pm.h>
  39 #endif
  40
  41 #include <linux/sm501.h>
  42 #include <linux/sm501-regs.h>
  43
  44 #define NR_PALETTE      256
  45
  46 enum sm501_controller {
  47         HEAD_CRT        = 0,
  48         HEAD_PANEL      = 1,
  49 };
  50
  51 /* SM501 memory address */
  52 struct sm501_mem {
  53         unsigned long    size;
  54         unsigned long    sm_addr;
  55         void __iomem    *k_addr;
  56 };
  57
  58 /* private data that is shared between all frambuffers* */
  59 struct sm501fb_info {
  60         struct device           *dev;
  61         struct fb_info          *fb[2];         /* fb info for both heads */
  62         struct resource         *fbmem_res;     /* framebuffer resource */
  63         struct resource         *regs_res;      /* registers resource */
  64         struct sm501_platdata_fb *pdata;        /* our platform data */
  65
  66         unsigned long            pm_crt_ctrl;   /* pm: crt ctrl save */
  67
  68         int                      irq;
  69         int                      swap_endian;   /* set to swap rgb=>bgr */
  70         void __iomem            *regs;          /* remapped registers */
  71         void __iomem            *fbmem;         /* remapped framebuffer */
  72         size_t                   fbmem_len;     /* length of remapped region */
  73 };
  74
  75 /* per-framebuffer private data */
  76 struct sm501fb_par {
  77         u32                      pseudo_palette[16];
  78
  79         enum sm501_controller    head;
  80         struct sm501_mem         cursor;
  81         struct sm501_mem         screen;
  82         struct fb_ops            ops;
  83
  84         void                    *store_fb;
  85         void                    *store_cursor;
  86         void __iomem            *cursor_regs;
  87         struct sm501fb_info     *info;
  88 };
  89
  90 /* Helper functions */
  91
  92 static inline int h_total(struct fb_var_screeninfo *var)
  93 {
  94         return var->xres + var->left_margin +
  95                 var->right_margin + var->hsync_len;
  96 }
  97
  98 static inline int v_total(struct fb_var_screeninfo *var)
  99 {
 100         return var->yres + var->upper_margin +
 101                 var->lower_margin + var->vsync_len;
 102 }
 103
 104 /* sm501fb_sync_regs()
 105  *
 106  * This call is mainly for PCI bus systems where we need to
 107  * ensure that any writes to the bus are completed before the
 108  * next phase, or after completing a function.
 109 */
 110
 111 static inline void sm501fb_sync_regs(struct sm501fb_info *info)
 112 {
 113         readl(info->regs);
 114 }
 115
 116 /* sm501_alloc_mem
 117  *
 118  * This is an attempt to lay out memory for the two framebuffers and
 119  * everything else
 120  *
 121  * |fbmem_res->start                                           fbmem_res->end|
 122  * |                                                                         |
 123  * |fb[0].fix.smem_start    |         |fb[1].fix.smem_start    |     2K      |
 124  * |-> fb[0].fix.smem_len <-| spare   |-> fb[1].fix.smem_len <-|-> cursors <-|
 125  *
 126  * The "spare" space is for the 2d engine data
 127  * the fixed is space for the cursors (2x1Kbyte)
 128  *
 129  * we need to allocate memory for the 2D acceleration engine
 130  * command list and the data for the engine to deal with.
 131  *
 132  * - all allocations must be 128bit aligned
 133  * - cursors are 64x64x2 bits (1Kbyte)
 134  *
 135  */
 136
 137 #define SM501_MEMF_CURSOR               (1)
 138 #define SM501_MEMF_PANEL                (2)
 139 #define SM501_MEMF_CRT                  (4)
 140 #define SM501_MEMF_ACCEL                (8)
 141
 142 static int sm501_alloc_mem(struct sm501fb_info *inf, struct sm501_mem *mem,
 143                            unsigned int why, size_t size)
 144 {
 145         unsigned int ptr = 0;
 146
 147         switch (why) {
 148         case SM501_MEMF_CURSOR:
 149                 ptr = inf->fbmem_len - size;
 150                 inf->fbmem_len = ptr;
 151                 break;
 152
 153         case SM501_MEMF_PANEL:
 154                 ptr = inf->fbmem_len - size;
 155                 if (ptr < inf->fb[0]->fix.smem_len)
 156                         return -ENOMEM;
 157
 158                 break;
 159
 160         case SM501_MEMF_CRT:
 161                 ptr = 0;
 162                 break;
 163
 164         case SM501_MEMF_ACCEL:
 165                 ptr = inf->fb[0]->fix.smem_len;
 166
 167                 if ((ptr + size) >
 168                     (inf->fb[1]->fix.smem_start - inf->fbmem_res->start))
 169                         return -ENOMEM;
 170                 break;
 171
 172         default:
 173                 return -EINVAL;
 174         }
 175
 176         mem->size    = size;
 177         mem->sm_addr = ptr;
 178         mem->k_addr  = inf->fbmem + ptr;
 179
 180         dev_dbg(inf->dev, "%s: result %08lx, %p - %u, %zd\n",
 181                 __func__, mem->sm_addr, mem->k_addr, why, size);
 182
 183         return 0;
 184 }
 185
 186 /* sm501fb_ps_to_hz
 187  *
 188  * Converts a period in picoseconds to Hz.
 189  *
 190  * Note, we try to keep this in Hz to minimise rounding with
 191  * the limited PLL settings on the SM501.
 192 */
 193
 194 static unsigned long sm501fb_ps_to_hz(unsigned long psvalue)
 195 {
 196         unsigned long long numerator=1000000000000ULL;
 197
 198         /* 10^12 / picosecond period gives frequency in Hz */
 199         do_div(numerator, psvalue);
 200         return (unsigned long)numerator;
 201 }
 202
 203 /* sm501fb_hz_to_ps is identical to the oposite transform */
 204
 205 #define sm501fb_hz_to_ps(x) sm501fb_ps_to_hz(x)
 206
 207 /* sm501fb_setup_gamma
 208  *
 209  * Programs a linear 1.0 gamma ramp in case the gamma
 210  * correction is enabled without programming anything else.
 211 */
 212
 213 static void sm501fb_setup_gamma(struct sm501fb_info *fbi,
 214                                 unsigned long palette)
 215 {
 216         unsigned long value = 0;
 217         int offset;
 218
 219         /* set gamma values */
 220         for (offset = 0; offset < 256 * 4; offset += 4) {
 221                 writel(value, fbi->regs + palette + offset);
 222                 value += 0x010101;      /* Advance RGB by 1,1,1.*/
 223         }
 224 }
 225
 226 /* sm501fb_check_var
 227  *
 228  * check common variables for both panel and crt
 229 */
 230
 231 static int sm501fb_check_var(struct fb_var_screeninfo *var,
 232                              struct fb_info *info)
 233 {
 234         struct sm501fb_par  *par = info->par;
 235         struct sm501fb_info *sm  = par->info;
 236         unsigned long tmp;
 237
 238         /* check we can fit these values into the registers */
 239
 240         if (var->hsync_len > 255 || var->vsync_len > 255)
 241                 return -EINVAL;
 242
 243         if ((var->xres + var->right_margin) >= 4096)
 244                 return -EINVAL;
 245
 246         if ((var->yres + var->lower_margin) > 2048)
 247                 return -EINVAL;
 248
 249         /* hard limits of device */
 250
 251         if (h_total(var) > 4096 || v_total(var) > 2048)
 252                 return -EINVAL;
 253
 254         /* check our line length is going to be 128 bit aligned */
 255
 256         tmp = (var->xres * var->bits_per_pixel) / 8;
 257         if ((tmp & 15) != 0)
 258                 return -EINVAL;
 259
 260         /* check the virtual size */
 261
 262         if (var->xres_virtual > 4096 || var->yres_virtual > 2048)
 263                 return -EINVAL;
 264
 265         /* can cope with 8,16 or 32bpp */
 266
 267         if (var->bits_per_pixel <= 8)
 268                 var->bits_per_pixel = 8;
 269         else if (var->bits_per_pixel <= 16)
 270                 var->bits_per_pixel = 16;
 271         else if (var->bits_per_pixel == 24)
 272                 var->bits_per_pixel = 32;
 273
 274         /* set r/g/b positions and validate bpp */
 275         switch(var->bits_per_pixel) {
 276         case 8:
 277                 var->red.length         = var->bits_per_pixel;
 278                 var->red.offset         = 0;
 279                 var->green.length       = var->bits_per_pixel;
 280                 var->green.offset       = 0;
 281                 var->blue.length        = var->bits_per_pixel;
 282                 var->blue.offset        = 0;
 283                 var->transp.length      = 0;
 284
 285                 break;
 286
 287         case 16:
 288                 if (sm->pdata->flags & SM501_FBPD_SWAP_FB_ENDIAN) {
 289                         var->red.offset         = 11;
 290                         var->green.offset       = 5;
 291                         var->blue.offset        = 0;
 292                 } else {
 293                         var->blue.offset        = 11;
 294                         var->green.offset       = 5;
 295                         var->red.offset         = 0;
 296                 }
 297
 298                 var->red.length         = 5;
 299                 var->green.length       = 6;
 300                 var->blue.length        = 5;
 301                 var->transp.length      = 0;
 302                 break;
 303
 304         case 32:
 305                 if (sm->pdata->flags & SM501_FBPD_SWAP_FB_ENDIAN) {
 306                         var->transp.offset      = 0;
 307                         var->red.offset         = 8;
 308                         var->green.offset       = 16;
 309                         var->blue.offset        = 24;
 310                 } else {
 311                         var->transp.offset      = 24;
 312                         var->red.offset         = 16;
 313                         var->green.offset       = 8;
 314                         var->blue.offset        = 0;
 315                 }
 316
 317                 var->red.length         = 8;
 318                 var->green.length       = 8;
 319                 var->blue.length        = 8;
 320                 var->transp.length      = 0;
 321                 break;
 322
 323         default:
 324                 return -EINVAL;
 325         }
 326
 327         return 0;
 328 }
 329
 330 /*
 331  * sm501fb_check_var_crt():
 332  *
 333  * check the parameters for the CRT head, and either bring them
 334  * back into range, or return -EINVAL.
 335 */
 336
 337 static int sm501fb_check_var_crt(struct fb_var_screeninfo *var,
 338                                  struct fb_info *info)
 339 {
 340         return sm501fb_check_var(var, info);
 341 }
 342
 343 /* sm501fb_check_var_pnl():
 344  *
 345  * check the parameters for the CRT head, and either bring them
 346  * back into range, or return -EINVAL.
 347 */
 348
 349 static int sm501fb_check_var_pnl(struct fb_var_screeninfo *var,
 350                                  struct fb_info *info)
 351 {
 352         return sm501fb_check_var(var, info);
 353 }
 354
 355 /* sm501fb_set_par_common
 356  *
 357  * set common registers for framebuffers
 358 */
 359
 360 static int sm501fb_set_par_common(struct fb_info *info,
 361                                   struct fb_var_screeninfo *var)
 362 {
 363         struct sm501fb_par  *par = info->par;
 364         struct sm501fb_info *fbi = par->info;
 365         unsigned long pixclock;      /* pixelclock in Hz */
 366         unsigned long sm501pixclock; /* pixelclock the 501 can achive in Hz */
 367         unsigned int mem_type;
 368         unsigned int clock_type;
 369         unsigned int head_addr;
 370
 371         dev_dbg(fbi->dev, "%s: %dx%d, bpp = %d, virtual %dx%d\n",
 372                 __func__, var->xres, var->yres, var->bits_per_pixel,
 373                 var->xres_virtual, var->yres_virtual);
 374
 375         switch (par->head) {
 376         case HEAD_CRT:
 377                 mem_type = SM501_MEMF_CRT;
 378                 clock_type = SM501_CLOCK_V2XCLK;
 379                 head_addr = SM501_DC_CRT_FB_ADDR;
 380                 break;
 381
 382         case HEAD_PANEL:
 383                 mem_type = SM501_MEMF_PANEL;
 384                 clock_type = SM501_CLOCK_P2XCLK;
 385                 head_addr = SM501_DC_PANEL_FB_ADDR;
 386                 break;
 387
 388         default:
 389                 mem_type = 0;           /* stop compiler warnings */
 390                 head_addr = 0;
 391                 clock_type = 0;
 392         }
 393
 394         switch (var->bits_per_pixel) {
 395         case 8:
 396                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 397                 break;
 398
 399         case 16:
 400                 info->fix.visual = FB_VISUAL_DIRECTCOLOR;
 401                 break;
 402
 403         case 32:
 404                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 405                 break;
 406         }
 407
 408         /* allocate fb memory within 501 */
 409         info->fix.line_length = (var->xres_virtual * var->bits_per_pixel)/8;
 410         info->fix.smem_len    = info->fix.line_length * var->yres_virtual;
 411
 412         dev_dbg(fbi->dev, "%s: line length = %u\n", __func__,
 413                 info->fix.line_length);
 414
 415         if (sm501_alloc_mem(fbi, &par->screen, mem_type,
 416                             info->fix.smem_len)) {
 417                 dev_err(fbi->dev, "no memory available\n");
 418                 return -ENOMEM;
 419         }
 420
 421         info->fix.smem_start = fbi->fbmem_res->start + par->screen.sm_addr;
 422
 423         info->screen_base = fbi->fbmem + par->screen.sm_addr;
 424         info->screen_size = info->fix.smem_len;
 425
 426         /* set start of framebuffer to the screen */
 427
 428         writel(par->screen.sm_addr | SM501_ADDR_FLIP, fbi->regs + head_addr);
 429
 430         /* program CRT clock  */
 431
 432         pixclock = sm501fb_ps_to_hz(var->pixclock);
 433
 434         sm501pixclock = sm501_set_clock(fbi->dev->parent, clock_type,
 435                                         pixclock);
 436
 437         /* update fb layer with actual clock used */
 438         var->pixclock = sm501fb_hz_to_ps(sm501pixclock);
 439
 440         dev_dbg(fbi->dev, "%s: pixclock(ps) = %u, pixclock(Hz)  = %lu, "
 441                "sm501pixclock = %lu,  error = %ld%%\n",
 442                __func__, var->pixclock, pixclock, sm501pixclock,
 443                ((pixclock - sm501pixclock)*100)/pixclock);
 444
 445         return 0;
 446 }
 447
 448 /* sm501fb_set_par_geometry
 449  *
 450  * set the geometry registers for specified framebuffer.
 451 */
 452
 453 static void sm501fb_set_par_geometry(struct fb_info *info,
 454                                      struct fb_var_screeninfo *var)
 455 {
 456         struct sm501fb_par  *par = info->par;
 457         struct sm501fb_info *fbi = par->info;
 458         void __iomem *base = fbi->regs;
 459         unsigned long reg;
 460
 461         if (par->head == HEAD_CRT)
 462                 base += SM501_DC_CRT_H_TOT;
 463         else
 464                 base += SM501_DC_PANEL_H_TOT;
 465
 466         /* set framebuffer width and display width */
 467
 468         reg = info->fix.line_length;
 469         reg |= ((var->xres * var->bits_per_pixel)/8) << 16;
 470
 471         writel(reg, fbi->regs + (par->head == HEAD_CRT ?
 472                     SM501_DC_CRT_FB_OFFSET :  SM501_DC_PANEL_FB_OFFSET));
 473
 474         /* program horizontal total */
 475
 476         reg  = (h_total(var) - 1) << 16;
 477         reg |= (var->xres - 1);
 478
 479         writel(reg, base + SM501_OFF_DC_H_TOT);
 480
 481         /* program horizontal sync */
 482
 483         reg  = var->hsync_len << 16;
 484         reg |= var->xres + var->right_margin - 1;
 485
 486         writel(reg, base + SM501_OFF_DC_H_SYNC);
 487
 488         /* program vertical total */
 489
 490         reg  = (v_total(var) - 1) << 16;
 491         reg |= (var->yres - 1);
 492
 493         writel(reg, base + SM501_OFF_DC_V_TOT);
 494
 495         /* program vertical sync */
 496         reg  = var->vsync_len << 16;
 497         reg |= var->yres + var->lower_margin - 1;
 498
 499         writel(reg, base + SM501_OFF_DC_V_SYNC);
 500 }
 501
 502 /* sm501fb_pan_crt
 503  *
 504  * pan the CRT display output within an virtual framebuffer
 505 */
 506
 507 static int sm501fb_pan_crt(struct fb_var_screeninfo *var,
 508                            struct fb_info *info)
 509 {
 510         struct sm501fb_par  *par = info->par;
 511         struct sm501fb_info *fbi = par->info;
 512         unsigned int bytes_pixel = var->bits_per_pixel / 8;
 513         unsigned long reg;
 514         unsigned long xoffs;
 515
 516         xoffs = var->xoffset * bytes_pixel;
 517
 518         reg = readl(fbi->regs + SM501_DC_CRT_CONTROL);
 519
 520         reg &= ~SM501_DC_CRT_CONTROL_PIXEL_MASK;
 521         reg |= ((xoffs & 15) / bytes_pixel) << 4;
 522         writel(reg, fbi->regs + SM501_DC_CRT_CONTROL);
 523
 524         reg = (par->screen.sm_addr + xoffs +
 525                var->yoffset * info->fix.line_length);
 526         writel(reg | SM501_ADDR_FLIP, fbi->regs + SM501_DC_CRT_FB_ADDR);
 527
 528         sm501fb_sync_regs(fbi);
 529         return 0;
 530 }
 531
 532 /* sm501fb_pan_pnl
 533  *
 534  * pan the panel display output within an virtual framebuffer
 535 */
 536
 537 static int sm501fb_pan_pnl(struct fb_var_screeninfo *var,
 538                            struct fb_info *info)
 539 {
 540         struct sm501fb_par  *par = info->par;
 541         struct sm501fb_info *fbi = par->info;
 542         unsigned long reg;
 543
 544         reg = var->xoffset | (var->xres_virtual << 16);
 545         writel(reg, fbi->regs + SM501_DC_PANEL_FB_WIDTH);
 546
 547         reg = var->yoffset | (var->yres_virtual << 16);
 548         writel(reg, fbi->regs + SM501_DC_PANEL_FB_HEIGHT);
 549
 550         sm501fb_sync_regs(fbi);
 551         return 0;
 552 }
 553
 554 /* sm501fb_set_par_crt
 555  *
 556  * Set the CRT video mode from the fb_info structure
 557 */
 558
 559 static int sm501fb_set_par_crt(struct fb_info *info)
 560 {
 561         struct sm501fb_par  *par = info->par;
 562         struct sm501fb_info *fbi = par->info;
 563         struct fb_var_screeninfo *var = &info->var;
 564         unsigned long control;       /* control register */
 565         int ret;
 566
 567         /* activate new configuration */
 568
 569         dev_dbg(fbi->dev, "%s(%p)\n", __func__, info);
 570
 571         /* enable CRT DAC - note 0 is on!*/
 572         sm501_misc_control(fbi->dev->parent, 0, SM501_MISC_DAC_POWER);
 573
 574         control = readl(fbi->regs + SM501_DC_CRT_CONTROL);
 575
 576         control &= (SM501_DC_CRT_CONTROL_PIXEL_MASK |
 577                     SM501_DC_CRT_CONTROL_GAMMA |
 578                     SM501_DC_CRT_CONTROL_BLANK |
 579                     SM501_DC_CRT_CONTROL_SEL |
 580                     SM501_DC_CRT_CONTROL_CP |
 581                     SM501_DC_CRT_CONTROL_TVP);
 582
 583         /* set the sync polarities before we check data source  */
 584
 585         if ((var->sync & FB_SYNC_HOR_HIGH_ACT) == 0)
 586                 control |= SM501_DC_CRT_CONTROL_HSP;
 587
 588         if ((var->sync & FB_SYNC_VERT_HIGH_ACT) == 0)
 589                 control |= SM501_DC_CRT_CONTROL_VSP;
 590
 591         if ((control & SM501_DC_CRT_CONTROL_SEL) == 0) {
 592                 /* the head is displaying panel data... */
 593
 594                 sm501_alloc_mem(fbi, &par->screen, SM501_MEMF_CRT, 0);
 595                 goto out_update;
 596         }
 597
 598         ret = sm501fb_set_par_common(info, var);
 599         if (ret) {
 600                 dev_err(fbi->dev, "failed to set common parameters\n");
 601                 return ret;
 602         }
 603
 604         sm501fb_pan_crt(var, info);
 605         sm501fb_set_par_geometry(info, var);
 606
 607         control |= SM501_FIFO_3;        /* fill if >3 free slots */
 608
 609         switch(var->bits_per_pixel) {
 610         case 8:
 611                 control |= SM501_DC_CRT_CONTROL_8BPP;
 612                 break;
 613
 614         case 16:
 615                 control |= SM501_DC_CRT_CONTROL_16BPP;
 616                 break;
 617
 618         case 32:
 619                 control |= SM501_DC_CRT_CONTROL_32BPP;
 620                 sm501fb_setup_gamma(fbi, SM501_DC_CRT_PALETTE);
 621                 break;
 622
 623         default:
 624                 BUG();
 625         }
 626
 627         control |= SM501_DC_CRT_CONTROL_SEL;    /* CRT displays CRT data */
 628         control |= SM501_DC_CRT_CONTROL_TE;     /* enable CRT timing */
 629         control |= SM501_DC_CRT_CONTROL_ENABLE; /* enable CRT plane */
 630
 631  out_update:
 632         dev_dbg(fbi->dev, "new control is %08lx\n", control);
 633
 634         writel(control, fbi->regs + SM501_DC_CRT_CONTROL);
 635         sm501fb_sync_regs(fbi);
 636
 637         return 0;
 638 }
 639
 640 static void sm501fb_panel_power(struct sm501fb_info *fbi, int to)
 641 {
 642         unsigned long control;
 643         void __iomem *ctrl_reg = fbi->regs + SM501_DC_PANEL_CONTROL;
 644         struct sm501_platdata_fbsub *pd = fbi->pdata->fb_pnl;
 645
 646         control = readl(ctrl_reg);
 647
 648         if (to && (control & SM501_DC_PANEL_CONTROL_VDD) == 0) {
 649                 /* enable panel power */
 650
 651                 control |= SM501_DC_PANEL_CONTROL_VDD;  /* FPVDDEN */
 652                 writel(control, ctrl_reg);
 653                 sm501fb_sync_regs(fbi);
 654                 mdelay(10);
 655
 656                 control |= SM501_DC_PANEL_CONTROL_DATA; /* DATA */
 657                 writel(control, ctrl_reg);
 658                 sm501fb_sync_regs(fbi);
 659                 mdelay(10);
 660
 661                 if (pd->flags & SM501FB_FLAG_PANEL_USE_VBIASEN) {
 662                         control |= SM501_DC_PANEL_CONTROL_BIAS; /* VBIASEN */
 663                         writel(control, ctrl_reg);
 664                         sm501fb_sync_regs(fbi);
 665                         mdelay(10);
 666                 }
 667
 668                 if (pd->flags & SM501FB_FLAG_PANEL_USE_FPEN) {
 669                         control |= SM501_DC_PANEL_CONTROL_FPEN;
 670                         writel(control, ctrl_reg);
 671                         sm501fb_sync_regs(fbi);
 672                         mdelay(10);
 673                 }
 674         } else if (!to && (control & SM501_DC_PANEL_CONTROL_VDD) != 0) {
 675                 /* disable panel power */
 676                 if (pd->flags & SM501FB_FLAG_PANEL_USE_FPEN) {
 677                         control &= ~SM501_DC_PANEL_CONTROL_FPEN;
 678                         writel(control, ctrl_reg);
 679                         sm501fb_sync_regs(fbi);
 680                         mdelay(10);
 681                 }
 682
 683                 if (pd->flags & SM501FB_FLAG_PANEL_USE_VBIASEN) {
 684                         control &= ~SM501_DC_PANEL_CONTROL_BIAS;
 685                         writel(control, ctrl_reg);
 686                         sm501fb_sync_regs(fbi);
 687                         mdelay(10);
 688                 }
 689
 690                 control &= ~SM501_DC_PANEL_CONTROL_DATA;
 691                 writel(control, ctrl_reg);
 692                 sm501fb_sync_regs(fbi);
 693                 mdelay(10);
 694
 695                 control &= ~SM501_DC_PANEL_CONTROL_VDD;
 696                 writel(control, ctrl_reg);
 697                 sm501fb_sync_regs(fbi);
 698                 mdelay(10);
 699         }
 700
 701         sm501fb_sync_regs(fbi);
 702 }
 703
 704 /* sm501fb_set_par_pnl
 705  *
 706  * Set the panel video mode from the fb_info structure
 707 */
 708
 709 static int sm501fb_set_par_pnl(struct fb_info *info)
 710 {
 711         struct sm501fb_par  *par = info->par;
 712         struct sm501fb_info *fbi = par->info;
 713         struct fb_var_screeninfo *var = &info->var;
 714         unsigned long control;
 715         unsigned long reg;
 716         int ret;
 717
 718         dev_dbg(fbi->dev, "%s(%p)\n", __func__, info);
 719
 720         /* activate this new configuration */
 721
 722         ret = sm501fb_set_par_common(info, var);
 723         if (ret)
 724                 return ret;
 725
 726         sm501fb_pan_pnl(var, info);
 727         sm501fb_set_par_geometry(info, var);
 728
 729         /* update control register */
 730
 731         control = readl(fbi->regs + SM501_DC_PANEL_CONTROL);
 732         control &= (SM501_DC_PANEL_CONTROL_GAMMA |
 733                     SM501_DC_PANEL_CONTROL_VDD  |
 734                     SM501_DC_PANEL_CONTROL_DATA |
 735                     SM501_DC_PANEL_CONTROL_BIAS |
 736                     SM501_DC_PANEL_CONTROL_FPEN |
 737                     SM501_DC_PANEL_CONTROL_CP |
 738                     SM501_DC_PANEL_CONTROL_CK |
 739                     SM501_DC_PANEL_CONTROL_HP |
 740                     SM501_DC_PANEL_CONTROL_VP |
 741                     SM501_DC_PANEL_CONTROL_HPD |
 742                     SM501_DC_PANEL_CONTROL_VPD);
 743
 744         control |= SM501_FIFO_3;        /* fill if >3 free slots */
 745
 746         switch(var->bits_per_pixel) {
 747         case 8:
 748                 control |= SM501_DC_PANEL_CONTROL_8BPP;
 749                 break;
 750
 751         case 16:
 752                 control |= SM501_DC_PANEL_CONTROL_16BPP;
 753                 break;
 754
 755         case 32:
 756                 control |= SM501_DC_PANEL_CONTROL_32BPP;
 757                 sm501fb_setup_gamma(fbi, SM501_DC_PANEL_PALETTE);
 758                 break;
 759
 760         default:
 761                 BUG();
 762         }
 763
 764         writel(0x0, fbi->regs + SM501_DC_PANEL_PANNING_CONTROL);
 765
 766         /* panel plane top left and bottom right location */
 767
 768         writel(0x00, fbi->regs + SM501_DC_PANEL_TL_LOC);
 769
 770         reg  = var->xres - 1;
 771         reg |= (var->yres - 1) << 16;
 772
 773         writel(reg, fbi->regs + SM501_DC_PANEL_BR_LOC);
 774
 775         /* program panel control register */
 776
 777         control |= SM501_DC_PANEL_CONTROL_TE;   /* enable PANEL timing */
 778         control |= SM501_DC_PANEL_CONTROL_EN;   /* enable PANEL gfx plane */
 779
 780         if ((var->sync & FB_SYNC_HOR_HIGH_ACT) == 0)
 781                 control |= SM501_DC_PANEL_CONTROL_HSP;
 782
 783         if ((var->sync & FB_SYNC_VERT_HIGH_ACT) == 0)
 784                 control |= SM501_DC_PANEL_CONTROL_VSP;
 785
 786         writel(control, fbi->regs + SM501_DC_PANEL_CONTROL);
 787         sm501fb_sync_regs(fbi);
 788
 789         /* ensure the panel interface is not tristated at this point */
 790
 791         sm501_modify_reg(fbi->dev->parent, SM501_SYSTEM_CONTROL,
 792                          0, SM501_SYSCTRL_PANEL_TRISTATE);
 793
 794         /* power the panel up */
 795         sm501fb_panel_power(fbi, 1);
 796         return 0;
 797 }
 798
 799
 800 /* chan_to_field
 801  *
 802  * convert a colour value into a field position
 803  *
 804  * from pxafb.c
 805 */
 806
 807 static inline unsigned int chan_to_field(unsigned int chan,
 808                                          struct fb_bitfield *bf)
 809 {
 810         chan &= 0xffff;
 811         chan >>= 16 - bf->length;
 812         return chan << bf->offset;
 813 }
 814
 815 /* sm501fb_setcolreg
 816  *
 817  * set the colour mapping for modes that support palettised data
 818 */
 819
 820 static int sm501fb_setcolreg(unsigned regno,
 821                              unsigned red, unsigned green, unsigned blue,
 822                              unsigned transp, struct fb_info *info)
 823 {
 824         struct sm501fb_par  *par = info->par;
 825         struct sm501fb_info *fbi = par->info;
 826         void __iomem *base = fbi->regs;
 827         unsigned int val;
 828
 829         if (par->head == HEAD_CRT)
 830                 base += SM501_DC_CRT_PALETTE;
 831         else
 832                 base += SM501_DC_PANEL_PALETTE;
 833
 834         switch (info->fix.visual) {
 835         case FB_VISUAL_TRUECOLOR:
 836                 /* true-colour, use pseuo-palette */
 837
 838                 if (regno < 16) {
 839                         u32 *pal = par->pseudo_palette;
 840
 841                         val  = chan_to_field(red,   &info->var.red);
 842                         val |= chan_to_field(green, &info->var.green);
 843                         val |= chan_to_field(blue,  &info->var.blue);
 844
 845                         pal[regno] = val;
 846                 }
 847                 break;
 848
 849         case FB_VISUAL_PSEUDOCOLOR:
 850                 if (regno < 256) {
 851                         val = (red >> 8) << 16;
 852                         val |= (green >> 8) << 8;
 853                         val |= blue >> 8;
 854
 855                         writel(val, base + (regno * 4));
 856                 }
 857
 858                 break;
 859
 860         default:
 861                 return 1;   /* unknown type */
 862         }
 863
 864         return 0;
 865 }
 866
 867 /* sm501fb_blank_pnl
 868  *
 869  * Blank or un-blank the panel interface
 870 */
 871
 872 static int sm501fb_blank_pnl(int blank_mode, struct fb_info *info)
 873 {
 874         struct sm501fb_par  *par = info->par;
 875         struct sm501fb_info *fbi = par->info;
 876
 877         dev_dbg(fbi->dev, "%s(mode=%d, %p)\n", __func__, blank_mode, info);
 878
 879         switch (blank_mode) {
 880         case FB_BLANK_POWERDOWN:
 881                 sm501fb_panel_power(fbi, 0);
 882                 break;
 883
 884         case FB_BLANK_UNBLANK:
 885                 sm501fb_panel_power(fbi, 1);
 886                 break;
 887
 888         case FB_BLANK_NORMAL:
 889         case FB_BLANK_VSYNC_SUSPEND:
 890         case FB_BLANK_HSYNC_SUSPEND:
 891         default:
 892                 return 1;
 893         }
 894
 895         return 0;
 896 }
 897
 898 /* sm501fb_blank_crt
 899  *
 900  * Blank or un-blank the crt interface
 901 */
 902
 903 static int sm501fb_blank_crt(int blank_mode, struct fb_info *info)
 904 {
 905         struct sm501fb_par  *par = info->par;
 906         struct sm501fb_info *fbi = par->info;
 907         unsigned long ctrl;
 908
 909         dev_dbg(fbi->dev, "%s(mode=%d, %p)\n", __func__, blank_mode, info);
 910
 911         ctrl = readl(fbi->regs + SM501_DC_CRT_CONTROL);
 912
 913         switch (blank_mode) {
 914         case FB_BLANK_POWERDOWN:
 915                 ctrl &= ~SM501_DC_CRT_CONTROL_ENABLE;
 916                 sm501_misc_control(fbi->dev->parent, SM501_MISC_DAC_POWER, 0);
 917
 918         case FB_BLANK_NORMAL:
 919                 ctrl |= SM501_DC_CRT_CONTROL_BLANK;
 920                 break;
 921
 922         case FB_BLANK_UNBLANK:
 923                 ctrl &= ~SM501_DC_CRT_CONTROL_BLANK;
 924                 ctrl |=  SM501_DC_CRT_CONTROL_ENABLE;
 925                 sm501_misc_control(fbi->dev->parent, 0, SM501_MISC_DAC_POWER);
 926                 break;
 927
 928         case FB_BLANK_VSYNC_SUSPEND:
 929         case FB_BLANK_HSYNC_SUSPEND:
 930         default:
 931                 return 1;
 932
 933         }
 934
 935         writel(ctrl, fbi->regs + SM501_DC_CRT_CONTROL);
 936         sm501fb_sync_regs(fbi);
 937
 938         return 0;
 939 }
 940
 941 /* sm501fb_cursor
 942  *
 943  * set or change the hardware cursor parameters
 944 */
 945
 946 static int sm501fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
 947 {
 948         struct sm501fb_par  *par = info->par;
 949         struct sm501fb_info *fbi = par->info;
 950         void __iomem *base = fbi->regs;
 951         unsigned long hwc_addr;
 952         unsigned long fg, bg;
 953
 954         dev_dbg(fbi->dev, "%s(%p,%p)\n", __func__, info, cursor);
 955
 956         if (par->head == HEAD_CRT)
 957                 base += SM501_DC_CRT_HWC_BASE;
 958         else
 959                 base += SM501_DC_PANEL_HWC_BASE;
 960
 961         /* check not being asked to exceed capabilities */
 962
 963         if (cursor->image.width > 64)
 964                 return -EINVAL;
 965
 966         if (cursor->image.height > 64)
 967                 return -EINVAL;
 968
 969         if (cursor->image.depth > 1)
 970                 return -EINVAL;
 971
 972         hwc_addr = readl(base + SM501_OFF_HWC_ADDR);
 973
 974         if (cursor->enable)
 975                 writel(hwc_addr | SM501_HWC_EN, base + SM501_OFF_HWC_ADDR);
 976         else
 977                 writel(hwc_addr & ~SM501_HWC_EN, base + SM501_OFF_HWC_ADDR);
 978
 979         /* set data */
 980         if (cursor->set & FB_CUR_SETPOS) {
 981                 unsigned int x = cursor->image.dx;
 982                 unsigned int y = cursor->image.dy;
 983
 984                 if (x >= 2048 || y >= 2048 )
 985                         return -EINVAL;
 986
 987                 dev_dbg(fbi->dev, "set position %d,%d\n", x, y);
 988
 989                 //y += cursor->image.height;
 990
 991                 writel(x | (y << 16), base + SM501_OFF_HWC_LOC);
 992         }
 993
 994         if (cursor->set & FB_CUR_SETCMAP) {
 995                 unsigned int bg_col = cursor->image.bg_color;
 996                 unsigned int fg_col = cursor->image.fg_color;
 997
 998                 dev_dbg(fbi->dev, "%s: update cmap (%08x,%08x)\n",
 999                         __func__, bg_col, fg_col);
1000
1001                 bg = ((info->cmap.red[bg_col] & 0xF8) << 8) |
1002                         ((info->cmap.green[bg_col] & 0xFC) << 3) |
1003                         ((info->cmap.blue[bg_col] & 0xF8) >> 3);
1004
1005                 fg = ((info->cmap.red[fg_col] & 0xF8) << 8) |
1006                         ((info->cmap.green[fg_col] & 0xFC) << 3) |
1007                         ((info->cmap.blue[fg_col] & 0xF8) >> 3);
1008
1009                 dev_dbg(fbi->dev, "fgcol %08lx, bgcol %08lx\n", fg, bg);
1010
1011                 writel(bg, base + SM501_OFF_HWC_COLOR_1_2);
1012                 writel(fg, base + SM501_OFF_HWC_COLOR_3);
1013         }
1014
1015         if (cursor->set & FB_CUR_SETSIZE ||
1016             cursor->set & (FB_CUR_SETIMAGE | FB_CUR_SETSHAPE)) {
1017                 /* SM501 cursor is a two bpp 64x64 bitmap this routine
1018                  * clears it to transparent then combines the cursor
1019                  * shape plane with the colour plane to set the
1020                  * cursor */
1021                 int x, y;
1022                 const unsigned char *pcol = cursor->image.data;
1023                 const unsigned char *pmsk = cursor->mask;
1024                 void __iomem   *dst = par->cursor.k_addr;
1025                 unsigned char  dcol = 0;
1026                 unsigned char  dmsk = 0;
1027                 unsigned int   op;
1028
1029                 dev_dbg(fbi->dev, "%s: setting shape (%d,%d)\n",
1030                         __func__, cursor->image.width, cursor->image.height);
1031
1032                 for (op = 0; op < (64*64*2)/8; op+=4)
1033                         writel(0x0, dst + op);
1034
1035                 for (y = 0; y < cursor->image.height; y++) {
1036                         for (x = 0; x < cursor->image.width; x++) {
1037                                 if ((x % 8) == 0) {
1038                                         dcol = *pcol++;
1039                                         dmsk = *pmsk++;
1040                                 } else {
1041                                         dcol >>= 1;
1042                                         dmsk >>= 1;
1043                                 }
1044
1045                                 if (dmsk & 1) {
1046                                         op = (dcol & 1) ? 1 : 3;
1047                                         op <<= ((x % 4) * 2);
1048
1049                                         op |= readb(dst + (x / 4));
1050                                         writeb(op, dst + (x / 4));
1051                                 }
1052                         }
1053                         dst += (64*2)/8;
1054                 }
1055         }
1056
1057         sm501fb_sync_regs(fbi); /* ensure cursor data flushed */
1058         return 0;
1059 }
1060
1061 /* sm501fb_crtsrc_show
1062  *
1063  * device attribute code to show where the crt output is sourced from
1064 */
1065
1066 static ssize_t sm501fb_crtsrc_show(struct device *dev,
1067                                struct device_attribute *attr, char *buf)
1068 {
1069         struct sm501fb_info *info = dev_get_drvdata(dev);
1070         unsigned long ctrl;
1071
1072         ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
1073         ctrl &= SM501_DC_CRT_CONTROL_SEL;
1074
1075         return snprintf(buf, PAGE_SIZE, "%s\n", ctrl ? "crt" : "panel");
1076 }
1077
1078 /* sm501fb_crtsrc_show
1079  *
1080  * device attribute code to set where the crt output is sourced from
1081 */
1082
1083 static ssize_t sm501fb_crtsrc_store(struct device *dev,
1084                                 struct device_attribute *attr,
1085                                 const char *buf, size_t len)
1086 {
1087         struct sm501fb_info *info = dev_get_drvdata(dev);
1088         enum sm501_controller head;
1089         unsigned long ctrl;
1090
1091         if (len < 1)
1092                 return -EINVAL;
1093
1094         if (strnicmp(buf, "crt", 3) == 0)
1095                 head = HEAD_CRT;
1096         else if (strnicmp(buf, "panel", 5) == 0)
1097                 head = HEAD_PANEL;
1098         else
1099                 return -EINVAL;
1100
1101         dev_info(dev, "setting crt source to head %d\n", head);
1102
1103         ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
1104
1105         if (head == HEAD_CRT) {
1106                 ctrl |= SM501_DC_CRT_CONTROL_SEL;
1107                 ctrl |= SM501_DC_CRT_CONTROL_ENABLE;
1108                 ctrl |= SM501_DC_CRT_CONTROL_TE;
1109         } else {
1110                 ctrl &= ~SM501_DC_CRT_CONTROL_SEL;
1111                 ctrl &= ~SM501_DC_CRT_CONTROL_ENABLE;
1112                 ctrl &= ~SM501_DC_CRT_CONTROL_TE;
1113         }
1114
1115         writel(ctrl, info->regs + SM501_DC_CRT_CONTROL);
1116         sm501fb_sync_regs(info);
1117
1118         return len;
1119 }
1120
1121 /* Prepare the device_attr for registration with sysfs later */
1122 static DEVICE_ATTR(crt_src, 0666, sm501fb_crtsrc_show, sm501fb_crtsrc_store);
1123
1124 /* sm501fb_show_regs
1125  *
1126  * show the primary sm501 registers
1127 */
1128 static int sm501fb_show_regs(struct sm501fb_info *info, char *ptr,
1129                              unsigned int start, unsigned int len)
1130 {
1131         void __iomem *mem = info->regs;
1132         char *buf = ptr;
1133         unsigned int reg;
1134
1135         for (reg = start; reg < (len + start); reg += 4)
1136                 ptr += sprintf(ptr, "%08x = %08x\n", reg, readl(mem + reg));
1137
1138         return ptr - buf;
1139 }
1140
1141 /* sm501fb_debug_show_crt
1142  *
1143  * show the crt control and cursor registers
1144 */
1145
1146 static ssize_t sm501fb_debug_show_crt(struct device *dev,
1147                                   struct device_attribute *attr, char *buf)
1148 {
1149         struct sm501fb_info *info = dev_get_drvdata(dev);
1150         char *ptr = buf;
1151
1152         ptr += sm501fb_show_regs(info, ptr, SM501_DC_CRT_CONTROL, 0x40);
1153         ptr += sm501fb_show_regs(info, ptr, SM501_DC_CRT_HWC_BASE, 0x10);
1154
1155         return ptr - buf;
1156 }
1157
1158 static DEVICE_ATTR(fbregs_crt, 0444, sm501fb_debug_show_crt, NULL);
1159
1160 /* sm501fb_debug_show_pnl
1161  *
1162  * show the panel control and cursor registers
1163 */
1164
1165 static ssize_t sm501fb_debug_show_pnl(struct device *dev,
1166                                   struct device_attribute *attr, char *buf)
1167 {
1168         struct sm501fb_info *info = dev_get_drvdata(dev);
1169         char *ptr = buf;
1170
1171         ptr += sm501fb_show_regs(info, ptr, 0x0, 0x40);
1172         ptr += sm501fb_show_regs(info, ptr, SM501_DC_PANEL_HWC_BASE, 0x10);
1173
1174         return ptr - buf;
1175 }
1176
1177 static DEVICE_ATTR(fbregs_pnl, 0444, sm501fb_debug_show_pnl, NULL);
1178
1179 /* framebuffer ops */
1180
1181 static struct fb_ops sm501fb_ops_crt = {
1182         .owner          = THIS_MODULE,
1183         .fb_check_var   = sm501fb_check_var_crt,
1184         .fb_set_par     = sm501fb_set_par_crt,
1185         .fb_blank       = sm501fb_blank_crt,
1186         .fb_setcolreg   = sm501fb_setcolreg,
1187         .fb_pan_display = sm501fb_pan_crt,
1188         .fb_cursor      = sm501fb_cursor,
1189         .fb_fillrect    = cfb_fillrect,
1190         .fb_copyarea    = cfb_copyarea,
1191         .fb_imageblit   = cfb_imageblit,
1192 };
1193
1194 static struct fb_ops sm501fb_ops_pnl = {
1195         .owner          = THIS_MODULE,
1196         .fb_check_var   = sm501fb_check_var_pnl,
1197         .fb_set_par     = sm501fb_set_par_pnl,
1198         .fb_pan_display = sm501fb_pan_pnl,
1199         .fb_blank       = sm501fb_blank_pnl,
1200         .fb_setcolreg   = sm501fb_setcolreg,
1201         .fb_cursor      = sm501fb_cursor,
1202         .fb_fillrect    = cfb_fillrect,
1203         .fb_copyarea    = cfb_copyarea,
1204         .fb_imageblit   = cfb_imageblit,
1205 };
1206
1207 /* sm501fb_info_alloc
1208  *
1209  * creates and initialises an sm501fb_info structure
1210 */
1211
1212 static struct sm501fb_info *sm501fb_info_alloc(struct fb_info *fbinfo_crt,
1213                                                struct fb_info *fbinfo_pnl)
1214 {
1215         struct sm501fb_info *info;
1216         struct sm501fb_par  *par;
1217
1218         info = kzalloc(sizeof(struct sm501fb_info), GFP_KERNEL);
1219         if (info) {
1220                 /* set the references back */
1221
1222                 par = fbinfo_crt->par;
1223                 par->info = info;
1224                 par->head = HEAD_CRT;
1225                 fbinfo_crt->pseudo_palette = &par->pseudo_palette;
1226
1227                 par = fbinfo_pnl->par;
1228                 par->info = info;
1229                 par->head = HEAD_PANEL;
1230                 fbinfo_pnl->pseudo_palette = &par->pseudo_palette;
1231
1232                 /* store the two fbs into our info */
1233                 info->fb[HEAD_CRT] = fbinfo_crt;
1234                 info->fb[HEAD_PANEL] = fbinfo_pnl;
1235         }
1236
1237         return info;
1238 }
1239
1240 /* sm501_init_cursor
1241  *
1242  * initialise hw cursor parameters
1243 */
1244
1245 static int sm501_init_cursor(struct fb_info *fbi, unsigned int reg_base)
1246 {
1247         struct sm501fb_par *par = fbi->par;
1248         struct sm501fb_info *info = par->info;
1249         int ret;
1250
1251         par->cursor_regs = info->regs + reg_base;
1252
1253         ret = sm501_alloc_mem(info, &par->cursor, SM501_MEMF_CURSOR, 1024);
1254         if (ret < 0)
1255                 return ret;
1256
1257         /* initialise the colour registers */
1258
1259         writel(par->cursor.sm_addr, par->cursor_regs + SM501_OFF_HWC_ADDR);
1260
1261         writel(0x00, par->cursor_regs + SM501_OFF_HWC_LOC);
1262         writel(0x00, par->cursor_regs + SM501_OFF_HWC_COLOR_1_2);
1263         writel(0x00, par->cursor_regs + SM501_OFF_HWC_COLOR_3);
1264         sm501fb_sync_regs(info);
1265
1266         return 0;
1267 }
1268
1269 /* sm501fb_info_start
1270  *
1271  * fills the par structure claiming resources and remapping etc.
1272 */
1273
1274 static int sm501fb_start(struct sm501fb_info *info,
1275                          struct platform_device *pdev)
1276 {
1277         struct resource *res;
1278         struct device *dev;
1279         int k;
1280         int ret;
1281
1282         info->dev = dev = &pdev->dev;
1283         platform_set_drvdata(pdev, info);
1284
1285         info->irq = ret = platform_get_irq(pdev, 0);
1286         if (ret < 0) {
1287                 /* we currently do not use the IRQ */
1288                 dev_warn(dev, "no irq for device\n");
1289         }
1290
1291         /* allocate, reserve and remap resources for registers */
1292         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1293         if (res == NULL) {
1294                 dev_err(dev, "no resource definition for registers\n");
1295                 ret = -ENOENT;
1296                 goto err_release;
1297         }
1298
1299         info->regs_res = request_mem_region(res->start,
1300                                             res->end - res->start,
1301                                             pdev->name);
1302
1303         if (info->regs_res == NULL) {
1304                 dev_err(dev, "cannot claim registers\n");
1305                 ret = -ENXIO;
1306                 goto err_release;
1307         }
1308
1309         info->regs = ioremap(res->start, (res->end - res->start)+1);
1310         if (info->regs == NULL) {
1311                 dev_err(dev, "cannot remap registers\n");
1312                 ret = -ENXIO;
1313                 goto err_regs_res;
1314         }
1315
1316         /* allocate, reserve resources for framebuffer */
1317         res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
1318         if (res == NULL) {
1319                 dev_err(dev, "no memory resource defined\n");
1320                 ret = -ENXIO;
1321                 goto err_regs_map;
1322         }
1323
1324         info->fbmem_res = request_mem_region(res->start,
1325                                              (res->end - res->start)+1,
1326                                              pdev->name);
1327         if (info->fbmem_res == NULL) {
1328                 dev_err(dev, "cannot claim framebuffer\n");
1329                 ret = -ENXIO;
1330                 goto err_regs_map;
1331         }
1332
1333         info->fbmem = ioremap(res->start, (res->end - res->start)+1);
1334         if (info->fbmem == NULL) {
1335                 dev_err(dev, "cannot remap framebuffer\n");
1336                 goto err_mem_res;
1337         }
1338
1339         info->fbmem_len = (res->end - res->start)+1;
1340
1341         /* clear framebuffer memory - avoids garbage data on unused fb */
1342         memset(info->fbmem, 0, info->fbmem_len);
1343
1344         /* clear palette ram - undefined at power on */
1345         for (k = 0; k < (256 * 3); k++)
1346                 writel(0, info->regs + SM501_DC_PANEL_PALETTE + (k * 4));
1347
1348         /* enable display controller */
1349         sm501_unit_power(dev->parent, SM501_GATE_DISPLAY, 1);
1350
1351         /* setup cursors */
1352
1353         sm501_init_cursor(info->fb[HEAD_CRT], SM501_DC_CRT_HWC_ADDR);
1354         sm501_init_cursor(info->fb[HEAD_PANEL], SM501_DC_PANEL_HWC_ADDR);
1355
1356         return 0; /* everything is setup */
1357
1358  err_mem_res:
1359         release_resource(info->fbmem_res);
1360         kfree(info->fbmem_res);
1361
1362  err_regs_map:
1363         iounmap(info->regs);
1364
1365  err_regs_res:
1366         release_resource(info->regs_res);
1367         kfree(info->regs_res);
1368
1369  err_release:
1370         return ret;
1371 }
1372
1373 static void sm501fb_stop(struct sm501fb_info *info)
1374 {
1375         /* disable display controller */
1376         sm501_unit_power(info->dev->parent, SM501_GATE_DISPLAY, 0);
1377
1378         iounmap(info->fbmem);
1379         release_resource(info->fbmem_res);
1380         kfree(info->fbmem_res);
1381
1382         iounmap(info->regs);
1383         release_resource(info->regs_res);
1384         kfree(info->regs_res);
1385 }
1386
1387 static void sm501fb_info_release(struct sm501fb_info *info)
1388 {
1389         kfree(info);
1390 }
1391
1392 static int sm501fb_init_fb(struct fb_info *fb,
1393                            enum sm501_controller head,
1394                            const char *fbname)
1395 {
1396         struct sm501_platdata_fbsub *pd;
1397         struct sm501fb_par *par = fb->par;
1398         struct sm501fb_info *info = par->info;
1399         unsigned long ctrl;
1400         unsigned int enable;
1401         int ret;
1402
1403         switch (head) {
1404         case HEAD_CRT:
1405                 pd = info->pdata->fb_crt;
1406                 ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
1407                 enable = (ctrl & SM501_DC_CRT_CONTROL_ENABLE) ? 1 : 0;
1408
1409                 /* ensure we set the correct source register */
1410                 if (info->pdata->fb_route != SM501_FB_CRT_PANEL) {
1411                         ctrl |= SM501_DC_CRT_CONTROL_SEL;
1412                         writel(ctrl, info->regs + SM501_DC_CRT_CONTROL);
1413                 }
1414
1415                 break;
1416
1417         case HEAD_PANEL:
1418                 pd = info->pdata->fb_pnl;
1419                 ctrl = readl(info->regs + SM501_DC_PANEL_CONTROL);
1420                 enable = (ctrl & SM501_DC_PANEL_CONTROL_EN) ? 1 : 0;
1421                 break;
1422
1423         default:
1424                 pd = NULL;              /* stop compiler warnings */
1425                 ctrl = 0;
1426                 enable = 0;
1427                 BUG();
1428         }
1429
1430         dev_info(info->dev, "fb %s %sabled at start\n",
1431                  fbname, enable ? "en" : "dis");
1432
1433         /* check to see if our routing allows this */
1434
1435         if (head == HEAD_CRT && info->pdata->fb_route == SM501_FB_CRT_PANEL) {
1436                 ctrl &= ~SM501_DC_CRT_CONTROL_SEL;
1437                 writel(ctrl, info->regs + SM501_DC_CRT_CONTROL);
1438                 enable = 0;
1439         }
1440
1441         strlcpy(fb->fix.id, fbname, sizeof(fb->fix.id));
1442
1443         memcpy(&par->ops,
1444                (head == HEAD_CRT) ? &sm501fb_ops_crt : &sm501fb_ops_pnl,
1445                sizeof(struct fb_ops));
1446
1447         /* update ops dependant on what we've been passed */
1448
1449         if ((pd->flags & SM501FB_FLAG_USE_HWCURSOR) == 0)
1450                 par->ops.fb_cursor = NULL;
1451
1452         fb->fbops = &par->ops;
1453         fb->flags = FBINFO_FLAG_DEFAULT |
1454                 FBINFO_HWACCEL_XPAN | FBINFO_HWACCEL_YPAN;
1455
1456         /* fixed data */
1457
1458         fb->fix.type            = FB_TYPE_PACKED_PIXELS;
1459         fb->fix.type_aux        = 0;
1460         fb->fix.xpanstep        = 1;
1461         fb->fix.ypanstep        = 1;
1462         fb->fix.ywrapstep       = 0;
1463         fb->fix.accel           = FB_ACCEL_NONE;
1464
1465         /* screenmode */
1466
1467         fb->var.nonstd          = 0;
1468         fb->var.activate        = FB_ACTIVATE_NOW;
1469         fb->var.accel_flags     = 0;
1470         fb->var.vmode           = FB_VMODE_NONINTERLACED;
1471         fb->var.bits_per_pixel  = 16;
1472
1473         if (enable && (pd->flags & SM501FB_FLAG_USE_INIT_MODE) && 0) {
1474                 /* TODO read the mode from the current display */
1475
1476         } else {
1477                 if (pd->def_mode) {
1478                         dev_info(info->dev, "using supplied mode\n");
1479                         fb_videomode_to_var(&fb->var, pd->def_mode);
1480
1481                         fb->var.bits_per_pixel = pd->def_bpp ? pd->def_bpp : 8;
1482                         fb->var.xres_virtual = fb->var.xres;
1483                         fb->var.yres_virtual = fb->var.yres;
1484                 } else {
1485                         ret = fb_find_mode(&fb->var, fb,
1486                                            NULL, NULL, 0, NULL, 8);
1487
1488                         if (ret == 0 || ret == 4) {
1489                                 dev_err(info->dev,
1490                                         "failed to get initial mode\n");
1491                                 return -EINVAL;
1492                         }
1493                 }
1494         }
1495
1496         /* initialise and set the palette */
1497         fb_alloc_cmap(&fb->cmap, NR_PALETTE, 0);
1498         fb_set_cmap(&fb->cmap, fb);
1499
1500         ret = (fb->fbops->fb_check_var)(&fb->var, fb);
1501         if (ret)
1502                 dev_err(info->dev, "check_var() failed on initial setup?\n");
1503
1504         /* ensure we've activated our new configuration */
1505         (fb->fbops->fb_set_par)(fb);
1506
1507         return 0;
1508 }
1509
1510 /* default platform data if none is supplied (ie, PCI device) */
1511
1512 static struct sm501_platdata_fbsub sm501fb_pdata_crt = {
1513         .flags          = (SM501FB_FLAG_USE_INIT_MODE |
1514                            SM501FB_FLAG_USE_HWCURSOR |
1515                            SM501FB_FLAG_USE_HWACCEL |
1516                            SM501FB_FLAG_DISABLE_AT_EXIT),
1517
1518 };
1519
1520 static struct sm501_platdata_fbsub sm501fb_pdata_pnl = {
1521         .flags          = (SM501FB_FLAG_USE_INIT_MODE |
1522                            SM501FB_FLAG_USE_HWCURSOR |
1523                            SM501FB_FLAG_USE_HWACCEL |
1524                            SM501FB_FLAG_DISABLE_AT_EXIT),
1525 };
1526
1527 static struct sm501_platdata_fb sm501fb_def_pdata = {
1528         .fb_route               = SM501_FB_OWN,
1529         .fb_crt                 = &sm501fb_pdata_crt,
1530         .fb_pnl                 = &sm501fb_pdata_pnl,
1531 };
1532
1533 static char driver_name_crt[] = "sm501fb-crt";
1534 static char driver_name_pnl[] = "sm501fb-panel";
1535
1536 static int __init sm501fb_probe(struct platform_device *pdev)
1537 {
1538         struct sm501fb_info *info;
1539         struct device       *dev = &pdev->dev;
1540         struct fb_info      *fbinfo_crt;
1541         struct fb_info      *fbinfo_pnl;
1542         int                  ret;
1543
1544         /* allocate our framebuffers */
1545
1546         fbinfo_crt = framebuffer_alloc(sizeof(struct sm501fb_par), dev);
1547         if (fbinfo_crt == NULL) {
1548                 dev_err(dev, "cannot allocate crt framebuffer\n");
1549                 return -ENOMEM;
1550         }
1551
1552         fbinfo_pnl = framebuffer_alloc(sizeof(struct sm501fb_par), dev);
1553         if (fbinfo_pnl == NULL) {
1554                 dev_err(dev, "cannot allocate panel framebuffer\n");
1555                 ret = -ENOMEM;
1556                 goto fbinfo_crt_alloc_fail;
1557         }
1558
1559         info = sm501fb_info_alloc(fbinfo_crt, fbinfo_pnl);
1560         if (info == NULL) {
1561                 dev_err(dev, "cannot allocate par\n");
1562                 ret = -ENOMEM;
1563                 goto sm501fb_alloc_fail;
1564         }
1565
1566         if (dev->parent->platform_data) {
1567                 struct sm501_platdata *pd = dev->parent->platform_data;
1568                 info->pdata = pd->fb;
1569         }
1570
1571         if (info->pdata == NULL) {
1572                 dev_info(dev, "using default configuration data\n");
1573                 info->pdata = &sm501fb_def_pdata;
1574         }
1575
1576         /* start the framebuffers */
1577
1578         ret = sm501fb_start(info, pdev);
1579         if (ret) {
1580                 dev_err(dev, "cannot initialise SM501\n");
1581                 goto sm501fb_start_fail;
1582         }
1583
1584         /* CRT framebuffer setup */
1585
1586         ret = sm501fb_init_fb(fbinfo_crt, HEAD_CRT, driver_name_crt);
1587         if (ret) {
1588                 dev_err(dev, "cannot initialise CRT fb\n");
1589                 goto sm501fb_start_fail;
1590         }
1591
1592         /* Panel framebuffer setup */
1593
1594         ret = sm501fb_init_fb(fbinfo_pnl, HEAD_PANEL, driver_name_pnl);
1595         if (ret) {
1596                 dev_err(dev, "cannot initialise Panel fb\n");
1597                 goto sm501fb_start_fail;
1598         }
1599
1600         /* register framebuffers */
1601
1602         ret = register_framebuffer(fbinfo_crt);
1603         if (ret < 0) {
1604                 dev_err(dev, "failed to register CRT fb (%d)\n", ret);
1605                 goto register_crt_fail;
1606         }
1607
1608         ret = register_framebuffer(fbinfo_pnl);
1609         if (ret < 0) {
1610                 dev_err(dev, "failed to register panel fb (%d)\n", ret);
1611                 goto register_pnl_fail;
1612         }
1613
1614         dev_info(dev, "fb%d: %s frame buffer device\n",
1615                  fbinfo_crt->node, fbinfo_crt->fix.id);
1616
1617         dev_info(dev, "fb%d: %s frame buffer device\n",
1618                fbinfo_pnl->node, fbinfo_pnl->fix.id);
1619
1620         /* create device files */
1621
1622         ret = device_create_file(dev, &dev_attr_crt_src);
1623         if (ret)
1624                 goto crtsrc_fail;
1625
1626         ret = device_create_file(dev, &dev_attr_fbregs_pnl);
1627         if (ret)
1628                 goto fbregs_pnl_fail;
1629
1630         ret = device_create_file(dev, &dev_attr_fbregs_crt);
1631         if (ret)
1632                 goto fbregs_crt_fail;
1633
1634         /* we registered, return ok */
1635         return 0;
1636
1637  fbregs_crt_fail:
1638         device_remove_file(dev, &dev_attr_fbregs_pnl);
1639
1640  fbregs_pnl_fail:
1641         device_remove_file(dev, &dev_attr_crt_src);
1642
1643  crtsrc_fail:
1644         unregister_framebuffer(fbinfo_pnl);
1645
1646  register_pnl_fail:
1647         unregister_framebuffer(fbinfo_crt);
1648
1649  register_crt_fail:
1650         sm501fb_stop(info);
1651
1652  sm501fb_start_fail:
1653         sm501fb_info_release(info);
1654
1655  sm501fb_alloc_fail:
1656         framebuffer_release(fbinfo_pnl);
1657
1658  fbinfo_crt_alloc_fail:
1659         framebuffer_release(fbinfo_crt);
1660
1661         return ret;
1662 }
1663
1664
1665 /*
1666  *  Cleanup
1667  */
1668 static int sm501fb_remove(struct platform_device *pdev)
1669 {
1670         struct sm501fb_info *info = platform_get_drvdata(pdev);
1671         struct fb_info     *fbinfo_crt = info->fb[0];
1672         struct fb_info     *fbinfo_pnl = info->fb[1];
1673
1674         device_remove_file(&pdev->dev, &dev_attr_fbregs_crt);
1675         device_remove_file(&pdev->dev, &dev_attr_fbregs_pnl);
1676         device_remove_file(&pdev->dev, &dev_attr_crt_src);
1677
1678         unregister_framebuffer(fbinfo_crt);
1679         unregister_framebuffer(fbinfo_pnl);
1680
1681         sm501fb_stop(info);
1682         sm501fb_info_release(info);
1683
1684         framebuffer_release(fbinfo_pnl);
1685         framebuffer_release(fbinfo_crt);
1686
1687         return 0;
1688 }
1689
1690 #ifdef CONFIG_PM
1691
1692 static int sm501fb_suspend_fb(struct sm501fb_info *info,
1693                               enum sm501_controller head)
1694 {
1695         struct fb_info *fbi = info->fb[head];
1696         struct sm501fb_par *par = fbi->par;
1697
1698         if (par->screen.size == 0)
1699                 return 0;
1700
1701         /* blank the relevant interface to ensure unit power minimised */
1702         (par->ops.fb_blank)(FB_BLANK_POWERDOWN, fbi);
1703
1704         /* tell console/fb driver we are suspending */
1705
1706         acquire_console_sem();
1707         fb_set_suspend(fbi, 1);
1708         release_console_sem();
1709
1710         /* backup copies in case chip is powered down over suspend */
1711
1712         par->store_fb = vmalloc(par->screen.size);
1713         if (par->store_fb == NULL) {
1714                 dev_err(info->dev, "no memory to store screen\n");
1715                 return -ENOMEM;
1716         }
1717
1718         par->store_cursor = vmalloc(par->cursor.size);
1719         if (par->store_cursor == NULL) {
1720                 dev_err(info->dev, "no memory to store cursor\n");
1721                 goto err_nocursor;
1722         }
1723
1724         dev_dbg(info->dev, "suspending screen to %p\n", par->store_fb);
1725         dev_dbg(info->dev, "suspending cursor to %p\n", par->store_cursor);
1726
1727         memcpy_fromio(par->store_fb, par->screen.k_addr, par->screen.size);
1728         memcpy_fromio(par->store_cursor, par->cursor.k_addr, par->cursor.size);
1729
1730         return 0;
1731
1732  err_nocursor:
1733         vfree(par->store_fb);
1734         par->store_fb = NULL;
1735
1736         return -ENOMEM;
1737 }
1738
1739 static void sm501fb_resume_fb(struct sm501fb_info *info,
1740                               enum sm501_controller head)
1741 {
1742         struct fb_info *fbi = info->fb[head];
1743         struct sm501fb_par *par = fbi->par;
1744
1745         if (par->screen.size == 0)
1746                 return;
1747
1748         /* re-activate the configuration */
1749
1750         (par->ops.fb_set_par)(fbi);
1751
1752         /* restore the data */
1753
1754         dev_dbg(info->dev, "restoring screen from %p\n", par->store_fb);
1755         dev_dbg(info->dev, "restoring cursor from %p\n", par->store_cursor);
1756
1757         if (par->store_fb)
1758                 memcpy_toio(par->screen.k_addr, par->store_fb,
1759                             par->screen.size);
1760
1761         if (par->store_cursor)
1762                 memcpy_toio(par->cursor.k_addr, par->store_cursor,
1763                             par->cursor.size);
1764
1765         acquire_console_sem();
1766         fb_set_suspend(fbi, 0);
1767         release_console_sem();
1768
1769         vfree(par->store_fb);
1770         vfree(par->store_cursor);
1771 }
1772
1773
1774 /* suspend and resume support */
1775
1776 static int sm501fb_suspend(struct platform_device *pdev, pm_message_t state)
1777 {
1778         struct sm501fb_info *info = platform_get_drvdata(pdev);
1779
1780         /* store crt control to resume with */
1781         info->pm_crt_ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
1782
1783         sm501fb_suspend_fb(info, HEAD_CRT);
1784         sm501fb_suspend_fb(info, HEAD_PANEL);
1785
1786         /* turn off the clocks, in case the device is not powered down */
1787         sm501_unit_power(info->dev->parent, SM501_GATE_DISPLAY, 0);
1788
1789         return 0;
1790 }
1791
1792 #define SM501_CRT_CTRL_SAVE (SM501_DC_CRT_CONTROL_TVP |        \
1793                              SM501_DC_CRT_CONTROL_SEL)
1794
1795
1796 static int sm501fb_resume(struct platform_device *pdev)
1797 {
1798         struct sm501fb_info *info = platform_get_drvdata(pdev);
1799         unsigned long crt_ctrl;
1800
1801         sm501_unit_power(info->dev->parent, SM501_GATE_DISPLAY, 1);
1802
1803         /* restore the items we want to be saved for crt control */
1804
1805         crt_ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
1806         crt_ctrl &= ~SM501_CRT_CTRL_SAVE;
1807         crt_ctrl |= info->pm_crt_ctrl & SM501_CRT_CTRL_SAVE;
1808         writel(crt_ctrl, info->regs + SM501_DC_CRT_CONTROL);
1809
1810         sm501fb_resume_fb(info, HEAD_CRT);
1811         sm501fb_resume_fb(info, HEAD_PANEL);
1812
1813         return 0;
1814 }
1815
1816 #else
1817 #define sm501fb_suspend NULL
1818 #define sm501fb_resume  NULL
1819 #endif
1820
1821 static struct platform_driver sm501fb_driver = {
1822         .probe          = sm501fb_probe,
1823         .remove         = sm501fb_remove,
1824         .suspend        = sm501fb_suspend,
1825         .resume         = sm501fb_resume,
1826         .driver         = {
1827                 .name   = "sm501-fb",
1828                 .owner  = THIS_MODULE,
1829         },
1830 };
1831
1832 static int __devinit sm501fb_init(void)
1833 {
1834         return platform_driver_register(&sm501fb_driver);
1835 }
1836
1837 static void __exit sm501fb_cleanup(void)
1838 {
1839         platform_driver_unregister(&sm501fb_driver);
1840 }
1841
1842 module_init(sm501fb_init);
1843 module_exit(sm501fb_cleanup);
1844
1845 MODULE_AUTHOR("Ben Dooks, Vincent Sanders");
1846 MODULE_DESCRIPTION("SM501 Framebuffer driver");
1847 MODULE_LICENSE("GPL v2");