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