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   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  *
  53  * This structure is used to track memory usage within the SM501 framebuffer
  54  * allocation. The sm_addr field is stored as an offset as it is often used
  55  * against both the physical and mapped addresses.
  56  */
  57 struct sm501_mem {
  58         unsigned long    size;
  59         unsigned long    sm_addr;       /* offset from base of sm501 fb. */
  60         void __iomem    *k_addr;
  61 };
  62
  63 /* private data that is shared between all frambuffers* */
  64 struct sm501fb_info {
  65         struct device           *dev;
  66         struct fb_info          *fb[2];         /* fb info for both heads */
  67         struct resource         *fbmem_res;     /* framebuffer resource */
  68         struct resource         *regs_res;      /* registers resource */
  69         struct sm501_platdata_fb *pdata;        /* our platform data */
  70
  71         unsigned long            pm_crt_ctrl;   /* pm: crt ctrl save */
  72
  73         int                      irq;
  74         int                      swap_endian;   /* set to swap rgb=>bgr */
  75         void __iomem            *regs;          /* remapped registers */
  76         void __iomem            *fbmem;         /* remapped framebuffer */
  77         size_t                   fbmem_len;     /* length of remapped region */
  78 };
  79
  80 /* per-framebuffer private data */
  81 struct sm501fb_par {
  82         u32                      pseudo_palette[16];
  83
  84         enum sm501_controller    head;
  85         struct sm501_mem         cursor;
  86         struct sm501_mem         screen;
  87         struct fb_ops            ops;
  88
  89         void                    *store_fb;
  90         void                    *store_cursor;
  91         void __iomem            *cursor_regs;
  92         struct sm501fb_info     *info;
  93 };
  94
  95 /* Helper functions */
  96
  97 static inline int h_total(struct fb_var_screeninfo *var)
  98 {
  99         return var->xres + var->left_margin +
 100                 var->right_margin + var->hsync_len;
 101 }
 102
 103 static inline int v_total(struct fb_var_screeninfo *var)
 104 {
 105         return var->yres + var->upper_margin +
 106                 var->lower_margin + var->vsync_len;
 107 }
 108
 109 /* sm501fb_sync_regs()
 110  *
 111  * This call is mainly for PCI bus systems where we need to
 112  * ensure that any writes to the bus are completed before the
 113  * next phase, or after completing a function.
 114 */
 115
 116 static inline void sm501fb_sync_regs(struct sm501fb_info *info)
 117 {
 118         readl(info->regs);
 119 }
 120
 121 /* sm501_alloc_mem
 122  *
 123  * This is an attempt to lay out memory for the two framebuffers and
 124  * everything else
 125  *
 126  * |fbmem_res->start                                           fbmem_res->end|
 127  * |                                                                         |
 128  * |fb[0].fix.smem_start    |         |fb[1].fix.smem_start    |     2K      |
 129  * |-> fb[0].fix.smem_len <-| spare   |-> fb[1].fix.smem_len <-|-> cursors <-|
 130  *
 131  * The "spare" space is for the 2d engine data
 132  * the fixed is space for the cursors (2x1Kbyte)
 133  *
 134  * we need to allocate memory for the 2D acceleration engine
 135  * command list and the data for the engine to deal with.
 136  *
 137  * - all allocations must be 128bit aligned
 138  * - cursors are 64x64x2 bits (1Kbyte)
 139  *
 140  */
 141
 142 #define SM501_MEMF_CURSOR               (1)
 143 #define SM501_MEMF_PANEL                (2)
 144 #define SM501_MEMF_CRT                  (4)
 145 #define SM501_MEMF_ACCEL                (8)
 146
 147 static int sm501_alloc_mem(struct sm501fb_info *inf, struct sm501_mem *mem,
 148                            unsigned int why, size_t size)
 149 {
 150         struct sm501fb_par *par;
 151         struct fb_info *fbi;
 152         unsigned int ptr;
 153         unsigned int end;
 154
 155         switch (why) {
 156         case SM501_MEMF_CURSOR:
 157                 ptr = inf->fbmem_len - size;
 158                 inf->fbmem_len = ptr;   /* adjust available memory. */
 159                 break;
 160
 161         case SM501_MEMF_PANEL:
 162                 if (size > inf->fbmem_len)
 163                         return -ENOMEM;
 164
 165                 ptr = inf->fbmem_len - size;
 166                 fbi = inf->fb[HEAD_CRT];
 167
 168                 /* round down, some programs such as directfb do not draw
 169                  * 0,0 correctly unless the start is aligned to a page start.
 170                  */
 171
 172                 if (ptr > 0)
 173                         ptr &= ~(PAGE_SIZE - 1);
 174
 175                 if (fbi && ptr < fbi->fix.smem_len)
 176                         return -ENOMEM;
 177
 178                 break;
 179
 180         case SM501_MEMF_CRT:
 181                 ptr = 0;
 182
 183                 /* check to see if we have panel memory allocated
 184                  * which would put an limit on available memory. */
 185
 186                 fbi = inf->fb[HEAD_PANEL];
 187                 if (fbi) {
 188                         par = fbi->par;
 189                         end = par->screen.k_addr ? par->screen.sm_addr : inf->fbmem_len;
 190                 } else
 191                         end = inf->fbmem_len;
 192
 193                 if ((ptr + size) > end)
 194                         return -ENOMEM;
 195
 196                 break;
 197
 198         case SM501_MEMF_ACCEL:
 199                 fbi = inf->fb[HEAD_CRT];
 200                 ptr = fbi ? fbi->fix.smem_len : 0;
 201
 202                 fbi = inf->fb[HEAD_PANEL];
 203                 if (fbi) {
 204                         par = fbi->par;
 205                         end = par->screen.sm_addr;
 206                 } else
 207                         end = inf->fbmem_len;
 208
 209                 if ((ptr + size) > end)
 210                         return -ENOMEM;
 211
 212                 break;
 213
 214         default:
 215                 return -EINVAL;
 216         }
 217
 218         mem->size    = size;
 219         mem->sm_addr = ptr;
 220         mem->k_addr  = inf->fbmem + ptr;
 221
 222         dev_dbg(inf->dev, "%s: result %08lx, %p - %u, %zd\n",
 223                 __func__, mem->sm_addr, mem->k_addr, why, size);
 224
 225         return 0;
 226 }
 227
 228 /* sm501fb_ps_to_hz
 229  *
 230  * Converts a period in picoseconds to Hz.
 231  *
 232  * Note, we try to keep this in Hz to minimise rounding with
 233  * the limited PLL settings on the SM501.
 234 */
 235
 236 static unsigned long sm501fb_ps_to_hz(unsigned long psvalue)
 237 {
 238         unsigned long long numerator=1000000000000ULL;
 239
 240         /* 10^12 / picosecond period gives frequency in Hz */
 241         do_div(numerator, psvalue);
 242         return (unsigned long)numerator;
 243 }
 244
 245 /* sm501fb_hz_to_ps is identical to the oposite transform */
 246
 247 #define sm501fb_hz_to_ps(x) sm501fb_ps_to_hz(x)
 248
 249 /* sm501fb_setup_gamma
 250  *
 251  * Programs a linear 1.0 gamma ramp in case the gamma
 252  * correction is enabled without programming anything else.
 253 */
 254
 255 static void sm501fb_setup_gamma(struct sm501fb_info *fbi,
 256                                 unsigned long palette)
 257 {
 258         unsigned long value = 0;
 259         int offset;
 260
 261         /* set gamma values */
 262         for (offset = 0; offset < 256 * 4; offset += 4) {
 263                 writel(value, fbi->regs + palette + offset);
 264                 value += 0x010101;      /* Advance RGB by 1,1,1.*/
 265         }
 266 }
 267
 268 /* sm501fb_check_var
 269  *
 270  * check common variables for both panel and crt
 271 */
 272
 273 static int sm501fb_check_var(struct fb_var_screeninfo *var,
 274                              struct fb_info *info)
 275 {
 276         struct sm501fb_par  *par = info->par;
 277         struct sm501fb_info *sm  = par->info;
 278         unsigned long tmp;
 279
 280         /* check we can fit these values into the registers */
 281
 282         if (var->hsync_len > 255 || var->vsync_len > 63)
 283                 return -EINVAL;
 284
 285         /* hdisplay end and hsync start */
 286         if ((var->xres + var->right_margin) > 4096)
 287                 return -EINVAL;
 288
 289         /* vdisplay end and vsync start */
 290         if ((var->yres + var->lower_margin) > 2048)
 291                 return -EINVAL;
 292
 293         /* hard limits of device */
 294
 295         if (h_total(var) > 4096 || v_total(var) > 2048)
 296                 return -EINVAL;
 297
 298         /* check our line length is going to be 128 bit aligned */
 299
 300         tmp = (var->xres * var->bits_per_pixel) / 8;
 301         if ((tmp & 15) != 0)
 302                 return -EINVAL;
 303
 304         /* check the virtual size */
 305
 306         if (var->xres_virtual > 4096 || var->yres_virtual > 2048)
 307                 return -EINVAL;
 308
 309         /* can cope with 8,16 or 32bpp */
 310
 311         if (var->bits_per_pixel <= 8)
 312                 var->bits_per_pixel = 8;
 313         else if (var->bits_per_pixel <= 16)
 314                 var->bits_per_pixel = 16;
 315         else if (var->bits_per_pixel == 24)
 316                 var->bits_per_pixel = 32;
 317
 318         /* set r/g/b positions and validate bpp */
 319         switch(var->bits_per_pixel) {
 320         case 8:
 321                 var->red.length         = var->bits_per_pixel;
 322                 var->red.offset         = 0;
 323                 var->green.length       = var->bits_per_pixel;
 324                 var->green.offset       = 0;
 325                 var->blue.length        = var->bits_per_pixel;
 326                 var->blue.offset        = 0;
 327                 var->transp.length      = 0;
 328                 var->transp.offset      = 0;
 329
 330                 break;
 331
 332         case 16:
 333                 if (sm->pdata->flags & SM501_FBPD_SWAP_FB_ENDIAN) {
 334                         var->blue.offset        = 11;
 335                         var->green.offset       = 5;
 336                         var->red.offset         = 0;
 337                 } else {
 338                         var->red.offset         = 11;
 339                         var->green.offset       = 5;
 340                         var->blue.offset        = 0;
 341                 }
 342                 var->transp.offset      = 0;
 343
 344                 var->red.length         = 5;
 345                 var->green.length       = 6;
 346                 var->blue.length        = 5;
 347                 var->transp.length      = 0;
 348                 break;
 349
 350         case 32:
 351                 if (sm->pdata->flags & SM501_FBPD_SWAP_FB_ENDIAN) {
 352                         var->transp.offset      = 0;
 353                         var->red.offset         = 8;
 354                         var->green.offset       = 16;
 355                         var->blue.offset        = 24;
 356                 } else {
 357                         var->transp.offset      = 24;
 358                         var->red.offset         = 16;
 359                         var->green.offset       = 8;
 360                         var->blue.offset        = 0;
 361                 }
 362
 363                 var->red.length         = 8;
 364                 var->green.length       = 8;
 365                 var->blue.length        = 8;
 366                 var->transp.length      = 0;
 367                 break;
 368
 369         default:
 370                 return -EINVAL;
 371         }
 372
 373         return 0;
 374 }
 375
 376 /*
 377  * sm501fb_check_var_crt():
 378  *
 379  * check the parameters for the CRT head, and either bring them
 380  * back into range, or return -EINVAL.
 381 */
 382
 383 static int sm501fb_check_var_crt(struct fb_var_screeninfo *var,
 384                                  struct fb_info *info)
 385 {
 386         return sm501fb_check_var(var, info);
 387 }
 388
 389 /* sm501fb_check_var_pnl():
 390  *
 391  * check the parameters for the CRT head, and either bring them
 392  * back into range, or return -EINVAL.
 393 */
 394
 395 static int sm501fb_check_var_pnl(struct fb_var_screeninfo *var,
 396                                  struct fb_info *info)
 397 {
 398         return sm501fb_check_var(var, info);
 399 }
 400
 401 /* sm501fb_set_par_common
 402  *
 403  * set common registers for framebuffers
 404 */
 405
 406 static int sm501fb_set_par_common(struct fb_info *info,
 407                                   struct fb_var_screeninfo *var)
 408 {
 409         struct sm501fb_par  *par = info->par;
 410         struct sm501fb_info *fbi = par->info;
 411         unsigned long pixclock;      /* pixelclock in Hz */
 412         unsigned long sm501pixclock; /* pixelclock the 501 can achive in Hz */
 413         unsigned int mem_type;
 414         unsigned int clock_type;
 415         unsigned int head_addr;
 416
 417         dev_dbg(fbi->dev, "%s: %dx%d, bpp = %d, virtual %dx%d\n",
 418                 __func__, var->xres, var->yres, var->bits_per_pixel,
 419                 var->xres_virtual, var->yres_virtual);
 420
 421         switch (par->head) {
 422         case HEAD_CRT:
 423                 mem_type = SM501_MEMF_CRT;
 424                 clock_type = SM501_CLOCK_V2XCLK;
 425                 head_addr = SM501_DC_CRT_FB_ADDR;
 426                 break;
 427
 428         case HEAD_PANEL:
 429                 mem_type = SM501_MEMF_PANEL;
 430                 clock_type = SM501_CLOCK_P2XCLK;
 431                 head_addr = SM501_DC_PANEL_FB_ADDR;
 432                 break;
 433
 434         default:
 435                 mem_type = 0;           /* stop compiler warnings */
 436                 head_addr = 0;
 437                 clock_type = 0;
 438         }
 439
 440         switch (var->bits_per_pixel) {
 441         case 8:
 442                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 443                 break;
 444
 445         case 16:
 446                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 447                 break;
 448
 449         case 32:
 450                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 451                 break;
 452         }
 453
 454         /* allocate fb memory within 501 */
 455         info->fix.line_length = (var->xres_virtual * var->bits_per_pixel)/8;
 456         info->fix.smem_len    = info->fix.line_length * var->yres_virtual;
 457
 458         dev_dbg(fbi->dev, "%s: line length = %u\n", __func__,
 459                 info->fix.line_length);
 460
 461         if (sm501_alloc_mem(fbi, &par->screen, mem_type,
 462                             info->fix.smem_len)) {
 463                 dev_err(fbi->dev, "no memory available\n");
 464                 return -ENOMEM;
 465         }
 466
 467         info->fix.smem_start = fbi->fbmem_res->start + par->screen.sm_addr;
 468
 469         info->screen_base = fbi->fbmem + par->screen.sm_addr;
 470         info->screen_size = info->fix.smem_len;
 471
 472         /* set start of framebuffer to the screen */
 473
 474         writel(par->screen.sm_addr | SM501_ADDR_FLIP, fbi->regs + head_addr);
 475
 476         /* program CRT clock  */
 477
 478         pixclock = sm501fb_ps_to_hz(var->pixclock);
 479
 480         sm501pixclock = sm501_set_clock(fbi->dev->parent, clock_type,
 481                                         pixclock);
 482
 483         /* update fb layer with actual clock used */
 484         var->pixclock = sm501fb_hz_to_ps(sm501pixclock);
 485
 486         dev_dbg(fbi->dev, "%s: pixclock(ps) = %u, pixclock(Hz)  = %lu, "
 487                "sm501pixclock = %lu,  error = %ld%%\n",
 488                __func__, var->pixclock, pixclock, sm501pixclock,
 489                ((pixclock - sm501pixclock)*100)/pixclock);
 490
 491         return 0;
 492 }
 493
 494 /* sm501fb_set_par_geometry
 495  *
 496  * set the geometry registers for specified framebuffer.
 497 */
 498
 499 static void sm501fb_set_par_geometry(struct fb_info *info,
 500                                      struct fb_var_screeninfo *var)
 501 {
 502         struct sm501fb_par  *par = info->par;
 503         struct sm501fb_info *fbi = par->info;
 504         void __iomem *base = fbi->regs;
 505         unsigned long reg;
 506
 507         if (par->head == HEAD_CRT)
 508                 base += SM501_DC_CRT_H_TOT;
 509         else
 510                 base += SM501_DC_PANEL_H_TOT;
 511
 512         /* set framebuffer width and display width */
 513
 514         reg = info->fix.line_length;
 515         reg |= ((var->xres * var->bits_per_pixel)/8) << 16;
 516
 517         writel(reg, fbi->regs + (par->head == HEAD_CRT ?
 518                     SM501_DC_CRT_FB_OFFSET :  SM501_DC_PANEL_FB_OFFSET));
 519
 520         /* program horizontal total */
 521
 522         reg  = (h_total(var) - 1) << 16;
 523         reg |= (var->xres - 1);
 524
 525         writel(reg, base + SM501_OFF_DC_H_TOT);
 526
 527         /* program horizontal sync */
 528
 529         reg  = var->hsync_len << 16;
 530         reg |= var->xres + var->right_margin - 1;
 531
 532         writel(reg, base + SM501_OFF_DC_H_SYNC);
 533
 534         /* program vertical total */
 535
 536         reg  = (v_total(var) - 1) << 16;
 537         reg |= (var->yres - 1);
 538
 539         writel(reg, base + SM501_OFF_DC_V_TOT);
 540
 541         /* program vertical sync */
 542         reg  = var->vsync_len << 16;
 543         reg |= var->yres + var->lower_margin - 1;
 544
 545         writel(reg, base + SM501_OFF_DC_V_SYNC);
 546 }
 547
 548 /* sm501fb_pan_crt
 549  *
 550  * pan the CRT display output within an virtual framebuffer
 551 */
 552
 553 static int sm501fb_pan_crt(struct fb_var_screeninfo *var,
 554                            struct fb_info *info)
 555 {
 556         struct sm501fb_par  *par = info->par;
 557         struct sm501fb_info *fbi = par->info;
 558         unsigned int bytes_pixel = var->bits_per_pixel / 8;
 559         unsigned long reg;
 560         unsigned long xoffs;
 561
 562         xoffs = var->xoffset * bytes_pixel;
 563
 564         reg = readl(fbi->regs + SM501_DC_CRT_CONTROL);
 565
 566         reg &= ~SM501_DC_CRT_CONTROL_PIXEL_MASK;
 567         reg |= ((xoffs & 15) / bytes_pixel) << 4;
 568         writel(reg, fbi->regs + SM501_DC_CRT_CONTROL);
 569
 570         reg = (par->screen.sm_addr + xoffs +
 571                var->yoffset * info->fix.line_length);
 572         writel(reg | SM501_ADDR_FLIP, fbi->regs + SM501_DC_CRT_FB_ADDR);
 573
 574         sm501fb_sync_regs(fbi);
 575         return 0;
 576 }
 577
 578 /* sm501fb_pan_pnl
 579  *
 580  * pan the panel display output within an virtual framebuffer
 581 */
 582
 583 static int sm501fb_pan_pnl(struct fb_var_screeninfo *var,
 584                            struct fb_info *info)
 585 {
 586         struct sm501fb_par  *par = info->par;
 587         struct sm501fb_info *fbi = par->info;
 588         unsigned long reg;
 589
 590         reg = var->xoffset | (var->xres_virtual << 16);
 591         writel(reg, fbi->regs + SM501_DC_PANEL_FB_WIDTH);
 592
 593         reg = var->yoffset | (var->yres_virtual << 16);
 594         writel(reg, fbi->regs + SM501_DC_PANEL_FB_HEIGHT);
 595
 596         sm501fb_sync_regs(fbi);
 597         return 0;
 598 }
 599
 600 /* sm501fb_set_par_crt
 601  *
 602  * Set the CRT video mode from the fb_info structure
 603 */
 604
 605 static int sm501fb_set_par_crt(struct fb_info *info)
 606 {
 607         struct sm501fb_par  *par = info->par;
 608         struct sm501fb_info *fbi = par->info;
 609         struct fb_var_screeninfo *var = &info->var;
 610         unsigned long control;       /* control register */
 611         int ret;
 612
 613         /* activate new configuration */
 614
 615         dev_dbg(fbi->dev, "%s(%p)\n", __func__, info);
 616
 617         /* enable CRT DAC - note 0 is on!*/
 618         sm501_misc_control(fbi->dev->parent, 0, SM501_MISC_DAC_POWER);
 619
 620         control = readl(fbi->regs + SM501_DC_CRT_CONTROL);
 621
 622         control &= (SM501_DC_CRT_CONTROL_PIXEL_MASK |
 623                     SM501_DC_CRT_CONTROL_GAMMA |
 624                     SM501_DC_CRT_CONTROL_BLANK |
 625                     SM501_DC_CRT_CONTROL_SEL |
 626                     SM501_DC_CRT_CONTROL_CP |
 627                     SM501_DC_CRT_CONTROL_TVP);
 628
 629         /* set the sync polarities before we check data source  */
 630
 631         if ((var->sync & FB_SYNC_HOR_HIGH_ACT) == 0)
 632                 control |= SM501_DC_CRT_CONTROL_HSP;
 633
 634         if ((var->sync & FB_SYNC_VERT_HIGH_ACT) == 0)
 635                 control |= SM501_DC_CRT_CONTROL_VSP;
 636
 637         if ((control & SM501_DC_CRT_CONTROL_SEL) == 0) {
 638                 /* the head is displaying panel data... */
 639
 640                 sm501_alloc_mem(fbi, &par->screen, SM501_MEMF_CRT, 0);
 641                 goto out_update;
 642         }
 643
 644         ret = sm501fb_set_par_common(info, var);
 645         if (ret) {
 646                 dev_err(fbi->dev, "failed to set common parameters\n");
 647                 return ret;
 648         }
 649
 650         sm501fb_pan_crt(var, info);
 651         sm501fb_set_par_geometry(info, var);
 652
 653         control |= SM501_FIFO_3;        /* fill if >3 free slots */
 654
 655         switch(var->bits_per_pixel) {
 656         case 8:
 657                 control |= SM501_DC_CRT_CONTROL_8BPP;
 658                 break;
 659
 660         case 16:
 661                 control |= SM501_DC_CRT_CONTROL_16BPP;
 662                 sm501fb_setup_gamma(fbi, SM501_DC_CRT_PALETTE);
 663                 break;
 664
 665         case 32:
 666                 control |= SM501_DC_CRT_CONTROL_32BPP;
 667                 sm501fb_setup_gamma(fbi, SM501_DC_CRT_PALETTE);
 668                 break;
 669
 670         default:
 671                 BUG();
 672         }
 673
 674         control |= SM501_DC_CRT_CONTROL_SEL;    /* CRT displays CRT data */
 675         control |= SM501_DC_CRT_CONTROL_TE;     /* enable CRT timing */
 676         control |= SM501_DC_CRT_CONTROL_ENABLE; /* enable CRT plane */
 677
 678  out_update:
 679         dev_dbg(fbi->dev, "new control is %08lx\n", control);
 680
 681         writel(control, fbi->regs + SM501_DC_CRT_CONTROL);
 682         sm501fb_sync_regs(fbi);
 683
 684         return 0;
 685 }
 686
 687 static void sm501fb_panel_power(struct sm501fb_info *fbi, int to)
 688 {
 689         unsigned long control;
 690         void __iomem *ctrl_reg = fbi->regs + SM501_DC_PANEL_CONTROL;
 691         struct sm501_platdata_fbsub *pd = fbi->pdata->fb_pnl;
 692
 693         control = readl(ctrl_reg);
 694
 695         if (to && (control & SM501_DC_PANEL_CONTROL_VDD) == 0) {
 696                 /* enable panel power */
 697
 698                 control |= SM501_DC_PANEL_CONTROL_VDD;  /* FPVDDEN */
 699                 writel(control, ctrl_reg);
 700                 sm501fb_sync_regs(fbi);
 701                 mdelay(10);
 702
 703                 control |= SM501_DC_PANEL_CONTROL_DATA; /* DATA */
 704                 writel(control, ctrl_reg);
 705                 sm501fb_sync_regs(fbi);
 706                 mdelay(10);
 707
 708                 /* VBIASEN */
 709
 710                 if (!(pd->flags & SM501FB_FLAG_PANEL_NO_VBIASEN)) {
 711                         if (pd->flags & SM501FB_FLAG_PANEL_INV_VBIASEN)
 712                                 control &= ~SM501_DC_PANEL_CONTROL_BIAS;
 713                         else
 714                                 control |= SM501_DC_PANEL_CONTROL_BIAS;
 715
 716                         writel(control, ctrl_reg);
 717                         sm501fb_sync_regs(fbi);
 718                         mdelay(10);
 719                 }
 720
 721                 if (!(pd->flags & SM501FB_FLAG_PANEL_NO_FPEN)) {
 722                         if (pd->flags & SM501FB_FLAG_PANEL_INV_FPEN)
 723                                 control &= ~SM501_DC_PANEL_CONTROL_FPEN;
 724                         else
 725                                 control |= SM501_DC_PANEL_CONTROL_FPEN;
 726
 727                         writel(control, ctrl_reg);
 728                         sm501fb_sync_regs(fbi);
 729                         mdelay(10);
 730                 }
 731         } else if (!to && (control & SM501_DC_PANEL_CONTROL_VDD) != 0) {
 732                 /* disable panel power */
 733                 if (!(pd->flags & SM501FB_FLAG_PANEL_NO_FPEN)) {
 734                         if (pd->flags & SM501FB_FLAG_PANEL_INV_FPEN)
 735                                 control |= SM501_DC_PANEL_CONTROL_FPEN;
 736                         else
 737                                 control &= ~SM501_DC_PANEL_CONTROL_FPEN;
 738
 739                         writel(control, ctrl_reg);
 740                         sm501fb_sync_regs(fbi);
 741                         mdelay(10);
 742                 }
 743
 744                 if (!(pd->flags & SM501FB_FLAG_PANEL_NO_VBIASEN)) {
 745                         if (pd->flags & SM501FB_FLAG_PANEL_INV_VBIASEN)
 746                                 control |= SM501_DC_PANEL_CONTROL_BIAS;
 747                         else
 748                                 control &= ~SM501_DC_PANEL_CONTROL_BIAS;
 749
 750                         writel(control, ctrl_reg);
 751                         sm501fb_sync_regs(fbi);
 752                         mdelay(10);
 753                 }
 754
 755                 control &= ~SM501_DC_PANEL_CONTROL_DATA;
 756                 writel(control, ctrl_reg);
 757                 sm501fb_sync_regs(fbi);
 758                 mdelay(10);
 759
 760                 control &= ~SM501_DC_PANEL_CONTROL_VDD;
 761                 writel(control, ctrl_reg);
 762                 sm501fb_sync_regs(fbi);
 763                 mdelay(10);
 764         }
 765
 766         sm501fb_sync_regs(fbi);
 767 }
 768
 769 /* sm501fb_set_par_pnl
 770  *
 771  * Set the panel video mode from the fb_info structure
 772 */
 773
 774 static int sm501fb_set_par_pnl(struct fb_info *info)
 775 {
 776         struct sm501fb_par  *par = info->par;
 777         struct sm501fb_info *fbi = par->info;
 778         struct fb_var_screeninfo *var = &info->var;
 779         unsigned long control;
 780         unsigned long reg;
 781         int ret;
 782
 783         dev_dbg(fbi->dev, "%s(%p)\n", __func__, info);
 784
 785         /* activate this new configuration */
 786
 787         ret = sm501fb_set_par_common(info, var);
 788         if (ret)
 789                 return ret;
 790
 791         sm501fb_pan_pnl(var, info);
 792         sm501fb_set_par_geometry(info, var);
 793
 794         /* update control register */
 795
 796         control = readl(fbi->regs + SM501_DC_PANEL_CONTROL);
 797         control &= (SM501_DC_PANEL_CONTROL_GAMMA |
 798                     SM501_DC_PANEL_CONTROL_VDD  |
 799                     SM501_DC_PANEL_CONTROL_DATA |
 800                     SM501_DC_PANEL_CONTROL_BIAS |
 801                     SM501_DC_PANEL_CONTROL_FPEN |
 802                     SM501_DC_PANEL_CONTROL_CP |
 803                     SM501_DC_PANEL_CONTROL_CK |
 804                     SM501_DC_PANEL_CONTROL_HP |
 805                     SM501_DC_PANEL_CONTROL_VP |
 806                     SM501_DC_PANEL_CONTROL_HPD |
 807                     SM501_DC_PANEL_CONTROL_VPD);
 808
 809         control |= SM501_FIFO_3;        /* fill if >3 free slots */
 810
 811         switch(var->bits_per_pixel) {
 812         case 8:
 813                 control |= SM501_DC_PANEL_CONTROL_8BPP;
 814                 break;
 815
 816         case 16:
 817                 control |= SM501_DC_PANEL_CONTROL_16BPP;
 818                 sm501fb_setup_gamma(fbi, SM501_DC_PANEL_PALETTE);
 819                 break;
 820
 821         case 32:
 822                 control |= SM501_DC_PANEL_CONTROL_32BPP;
 823                 sm501fb_setup_gamma(fbi, SM501_DC_PANEL_PALETTE);
 824                 break;
 825
 826         default:
 827                 BUG();
 828         }
 829
 830         writel(0x0, fbi->regs + SM501_DC_PANEL_PANNING_CONTROL);
 831
 832         /* panel plane top left and bottom right location */
 833
 834         writel(0x00, fbi->regs + SM501_DC_PANEL_TL_LOC);
 835
 836         reg  = var->xres - 1;
 837         reg |= (var->yres - 1) << 16;
 838
 839         writel(reg, fbi->regs + SM501_DC_PANEL_BR_LOC);
 840
 841         /* program panel control register */
 842
 843         control |= SM501_DC_PANEL_CONTROL_TE;   /* enable PANEL timing */
 844         control |= SM501_DC_PANEL_CONTROL_EN;   /* enable PANEL gfx plane */
 845
 846         if ((var->sync & FB_SYNC_HOR_HIGH_ACT) == 0)
 847                 control |= SM501_DC_PANEL_CONTROL_HSP;
 848
 849         if ((var->sync & FB_SYNC_VERT_HIGH_ACT) == 0)
 850                 control |= SM501_DC_PANEL_CONTROL_VSP;
 851
 852         writel(control, fbi->regs + SM501_DC_PANEL_CONTROL);
 853         sm501fb_sync_regs(fbi);
 854
 855         /* ensure the panel interface is not tristated at this point */
 856
 857         sm501_modify_reg(fbi->dev->parent, SM501_SYSTEM_CONTROL,
 858                          0, SM501_SYSCTRL_PANEL_TRISTATE);
 859
 860         /* power the panel up */
 861         sm501fb_panel_power(fbi, 1);
 862         return 0;
 863 }
 864
 865
 866 /* chan_to_field
 867  *
 868  * convert a colour value into a field position
 869  *
 870  * from pxafb.c
 871 */
 872
 873 static inline unsigned int chan_to_field(unsigned int chan,
 874                                          struct fb_bitfield *bf)
 875 {
 876         chan &= 0xffff;
 877         chan >>= 16 - bf->length;
 878         return chan << bf->offset;
 879 }
 880
 881 /* sm501fb_setcolreg
 882  *
 883  * set the colour mapping for modes that support palettised data
 884 */
 885
 886 static int sm501fb_setcolreg(unsigned regno,
 887                              unsigned red, unsigned green, unsigned blue,
 888                              unsigned transp, struct fb_info *info)
 889 {
 890         struct sm501fb_par  *par = info->par;
 891         struct sm501fb_info *fbi = par->info;
 892         void __iomem *base = fbi->regs;
 893         unsigned int val;
 894
 895         if (par->head == HEAD_CRT)
 896                 base += SM501_DC_CRT_PALETTE;
 897         else
 898                 base += SM501_DC_PANEL_PALETTE;
 899
 900         switch (info->fix.visual) {
 901         case FB_VISUAL_TRUECOLOR:
 902                 /* true-colour, use pseuo-palette */
 903
 904                 if (regno < 16) {
 905                         u32 *pal = par->pseudo_palette;
 906
 907                         val  = chan_to_field(red,   &info->var.red);
 908                         val |= chan_to_field(green, &info->var.green);
 909                         val |= chan_to_field(blue,  &info->var.blue);
 910
 911                         pal[regno] = val;
 912                 }
 913                 break;
 914
 915         case FB_VISUAL_PSEUDOCOLOR:
 916                 if (regno < 256) {
 917                         val = (red >> 8) << 16;
 918                         val |= (green >> 8) << 8;
 919                         val |= blue >> 8;
 920
 921                         writel(val, base + (regno * 4));
 922                 }
 923
 924                 break;
 925
 926         default:
 927                 return 1;   /* unknown type */
 928         }
 929
 930         return 0;
 931 }
 932
 933 /* sm501fb_blank_pnl
 934  *
 935  * Blank or un-blank the panel interface
 936 */
 937
 938 static int sm501fb_blank_pnl(int blank_mode, struct fb_info *info)
 939 {
 940         struct sm501fb_par  *par = info->par;
 941         struct sm501fb_info *fbi = par->info;
 942
 943         dev_dbg(fbi->dev, "%s(mode=%d, %p)\n", __func__, blank_mode, info);
 944
 945         switch (blank_mode) {
 946         case FB_BLANK_POWERDOWN:
 947                 sm501fb_panel_power(fbi, 0);
 948                 break;
 949
 950         case FB_BLANK_UNBLANK:
 951                 sm501fb_panel_power(fbi, 1);
 952                 break;
 953
 954         case FB_BLANK_NORMAL:
 955         case FB_BLANK_VSYNC_SUSPEND:
 956         case FB_BLANK_HSYNC_SUSPEND:
 957         default:
 958                 return 1;
 959         }
 960
 961         return 0;
 962 }
 963
 964 /* sm501fb_blank_crt
 965  *
 966  * Blank or un-blank the crt interface
 967 */
 968
 969 static int sm501fb_blank_crt(int blank_mode, struct fb_info *info)
 970 {
 971         struct sm501fb_par  *par = info->par;
 972         struct sm501fb_info *fbi = par->info;
 973         unsigned long ctrl;
 974
 975         dev_dbg(fbi->dev, "%s(mode=%d, %p)\n", __func__, blank_mode, info);
 976
 977         ctrl = readl(fbi->regs + SM501_DC_CRT_CONTROL);
 978
 979         switch (blank_mode) {
 980         case FB_BLANK_POWERDOWN:
 981                 ctrl &= ~SM501_DC_CRT_CONTROL_ENABLE;
 982                 sm501_misc_control(fbi->dev->parent, SM501_MISC_DAC_POWER, 0);
 983
 984         case FB_BLANK_NORMAL:
 985                 ctrl |= SM501_DC_CRT_CONTROL_BLANK;
 986                 break;
 987
 988         case FB_BLANK_UNBLANK:
 989                 ctrl &= ~SM501_DC_CRT_CONTROL_BLANK;
 990                 ctrl |=  SM501_DC_CRT_CONTROL_ENABLE;
 991                 sm501_misc_control(fbi->dev->parent, 0, SM501_MISC_DAC_POWER);
 992                 break;
 993
 994         case FB_BLANK_VSYNC_SUSPEND:
 995         case FB_BLANK_HSYNC_SUSPEND:
 996         default:
 997                 return 1;
 998
 999         }
1000
1001         writel(ctrl, fbi->regs + SM501_DC_CRT_CONTROL);
1002         sm501fb_sync_regs(fbi);
1003
1004         return 0;
1005 }
1006
1007 /* sm501fb_cursor
1008  *
1009  * set or change the hardware cursor parameters
1010 */
1011
1012 static int sm501fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
1013 {
1014         struct sm501fb_par  *par = info->par;
1015         struct sm501fb_info *fbi = par->info;
1016         void __iomem *base = fbi->regs;
1017         unsigned long hwc_addr;
1018         unsigned long fg, bg;
1019
1020         dev_dbg(fbi->dev, "%s(%p,%p)\n", __func__, info, cursor);
1021
1022         if (par->head == HEAD_CRT)
1023                 base += SM501_DC_CRT_HWC_BASE;
1024         else
1025                 base += SM501_DC_PANEL_HWC_BASE;
1026
1027         /* check not being asked to exceed capabilities */
1028
1029         if (cursor->image.width > 64)
1030                 return -EINVAL;
1031
1032         if (cursor->image.height > 64)
1033                 return -EINVAL;
1034
1035         if (cursor->image.depth > 1)
1036                 return -EINVAL;
1037
1038         hwc_addr = readl(base + SM501_OFF_HWC_ADDR);
1039
1040         if (cursor->enable)
1041                 writel(hwc_addr | SM501_HWC_EN, base + SM501_OFF_HWC_ADDR);
1042         else
1043                 writel(hwc_addr & ~SM501_HWC_EN, base + SM501_OFF_HWC_ADDR);
1044
1045         /* set data */
1046         if (cursor->set & FB_CUR_SETPOS) {
1047                 unsigned int x = cursor->image.dx;
1048                 unsigned int y = cursor->image.dy;
1049
1050                 if (x >= 2048 || y >= 2048 )
1051                         return -EINVAL;
1052
1053                 dev_dbg(fbi->dev, "set position %d,%d\n", x, y);
1054
1055                 //y += cursor->image.height;
1056
1057                 writel(x | (y << 16), base + SM501_OFF_HWC_LOC);
1058         }
1059
1060         if (cursor->set & FB_CUR_SETCMAP) {
1061                 unsigned int bg_col = cursor->image.bg_color;
1062                 unsigned int fg_col = cursor->image.fg_color;
1063
1064                 dev_dbg(fbi->dev, "%s: update cmap (%08x,%08x)\n",
1065                         __func__, bg_col, fg_col);
1066
1067                 bg = ((info->cmap.red[bg_col] & 0xF8) << 8) |
1068                         ((info->cmap.green[bg_col] & 0xFC) << 3) |
1069                         ((info->cmap.blue[bg_col] & 0xF8) >> 3);
1070
1071                 fg = ((info->cmap.red[fg_col] & 0xF8) << 8) |
1072                         ((info->cmap.green[fg_col] & 0xFC) << 3) |
1073                         ((info->cmap.blue[fg_col] & 0xF8) >> 3);
1074
1075                 dev_dbg(fbi->dev, "fgcol %08lx, bgcol %08lx\n", fg, bg);
1076
1077                 writel(bg, base + SM501_OFF_HWC_COLOR_1_2);
1078                 writel(fg, base + SM501_OFF_HWC_COLOR_3);
1079         }
1080
1081         if (cursor->set & FB_CUR_SETSIZE ||
1082             cursor->set & (FB_CUR_SETIMAGE | FB_CUR_SETSHAPE)) {
1083                 /* SM501 cursor is a two bpp 64x64 bitmap this routine
1084                  * clears it to transparent then combines the cursor
1085                  * shape plane with the colour plane to set the
1086                  * cursor */
1087                 int x, y;
1088                 const unsigned char *pcol = cursor->image.data;
1089                 const unsigned char *pmsk = cursor->mask;
1090                 void __iomem   *dst = par->cursor.k_addr;
1091                 unsigned char  dcol = 0;
1092                 unsigned char  dmsk = 0;
1093                 unsigned int   op;
1094
1095                 dev_dbg(fbi->dev, "%s: setting shape (%d,%d)\n",
1096                         __func__, cursor->image.width, cursor->image.height);
1097
1098                 for (op = 0; op < (64*64*2)/8; op+=4)
1099                         writel(0x0, dst + op);
1100
1101                 for (y = 0; y < cursor->image.height; y++) {
1102                         for (x = 0; x < cursor->image.width; x++) {
1103                                 if ((x % 8) == 0) {
1104                                         dcol = *pcol++;
1105                                         dmsk = *pmsk++;
1106                                 } else {
1107                                         dcol >>= 1;
1108                                         dmsk >>= 1;
1109                                 }
1110
1111                                 if (dmsk & 1) {
1112                                         op = (dcol & 1) ? 1 : 3;
1113                                         op <<= ((x % 4) * 2);
1114
1115                                         op |= readb(dst + (x / 4));
1116                                         writeb(op, dst + (x / 4));
1117                                 }
1118                         }
1119                         dst += (64*2)/8;
1120                 }
1121         }
1122
1123         sm501fb_sync_regs(fbi); /* ensure cursor data flushed */
1124         return 0;
1125 }
1126
1127 /* sm501fb_crtsrc_show
1128  *
1129  * device attribute code to show where the crt output is sourced from
1130 */
1131
1132 static ssize_t sm501fb_crtsrc_show(struct device *dev,
1133                                struct device_attribute *attr, char *buf)
1134 {
1135         struct sm501fb_info *info = dev_get_drvdata(dev);
1136         unsigned long ctrl;
1137
1138         ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
1139         ctrl &= SM501_DC_CRT_CONTROL_SEL;
1140
1141         return snprintf(buf, PAGE_SIZE, "%s\n", ctrl ? "crt" : "panel");
1142 }
1143
1144 /* sm501fb_crtsrc_show
1145  *
1146  * device attribute code to set where the crt output is sourced from
1147 */
1148
1149 static ssize_t sm501fb_crtsrc_store(struct device *dev,
1150                                 struct device_attribute *attr,
1151                                 const char *buf, size_t len)
1152 {
1153         struct sm501fb_info *info = dev_get_drvdata(dev);
1154         enum sm501_controller head;
1155         unsigned long ctrl;
1156
1157         if (len < 1)
1158                 return -EINVAL;
1159
1160         if (strnicmp(buf, "crt", 3) == 0)
1161                 head = HEAD_CRT;
1162         else if (strnicmp(buf, "panel", 5) == 0)
1163                 head = HEAD_PANEL;
1164         else
1165                 return -EINVAL;
1166
1167         dev_info(dev, "setting crt source to head %d\n", head);
1168
1169         ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
1170
1171         if (head == HEAD_CRT) {
1172                 ctrl |= SM501_DC_CRT_CONTROL_SEL;
1173                 ctrl |= SM501_DC_CRT_CONTROL_ENABLE;
1174                 ctrl |= SM501_DC_CRT_CONTROL_TE;
1175         } else {
1176                 ctrl &= ~SM501_DC_CRT_CONTROL_SEL;
1177                 ctrl &= ~SM501_DC_CRT_CONTROL_ENABLE;
1178                 ctrl &= ~SM501_DC_CRT_CONTROL_TE;
1179         }
1180
1181         writel(ctrl, info->regs + SM501_DC_CRT_CONTROL);
1182         sm501fb_sync_regs(info);
1183
1184         return len;
1185 }
1186
1187 /* Prepare the device_attr for registration with sysfs later */
1188 static DEVICE_ATTR(crt_src, 0666, sm501fb_crtsrc_show, sm501fb_crtsrc_store);
1189
1190 /* sm501fb_show_regs
1191  *
1192  * show the primary sm501 registers
1193 */
1194 static int sm501fb_show_regs(struct sm501fb_info *info, char *ptr,
1195                              unsigned int start, unsigned int len)
1196 {
1197         void __iomem *mem = info->regs;
1198         char *buf = ptr;
1199         unsigned int reg;
1200
1201         for (reg = start; reg < (len + start); reg += 4)
1202                 ptr += sprintf(ptr, "%08x = %08x\n", reg, readl(mem + reg));
1203
1204         return ptr - buf;
1205 }
1206
1207 /* sm501fb_debug_show_crt
1208  *
1209  * show the crt control and cursor registers
1210 */
1211
1212 static ssize_t sm501fb_debug_show_crt(struct device *dev,
1213                                   struct device_attribute *attr, char *buf)
1214 {
1215         struct sm501fb_info *info = dev_get_drvdata(dev);
1216         char *ptr = buf;
1217
1218         ptr += sm501fb_show_regs(info, ptr, SM501_DC_CRT_CONTROL, 0x40);
1219         ptr += sm501fb_show_regs(info, ptr, SM501_DC_CRT_HWC_BASE, 0x10);
1220
1221         return ptr - buf;
1222 }
1223
1224 static DEVICE_ATTR(fbregs_crt, 0444, sm501fb_debug_show_crt, NULL);
1225
1226 /* sm501fb_debug_show_pnl
1227  *
1228  * show the panel control and cursor registers
1229 */
1230
1231 static ssize_t sm501fb_debug_show_pnl(struct device *dev,
1232                                   struct device_attribute *attr, char *buf)
1233 {
1234         struct sm501fb_info *info = dev_get_drvdata(dev);
1235         char *ptr = buf;
1236
1237         ptr += sm501fb_show_regs(info, ptr, 0x0, 0x40);
1238         ptr += sm501fb_show_regs(info, ptr, SM501_DC_PANEL_HWC_BASE, 0x10);
1239
1240         return ptr - buf;
1241 }
1242
1243 static DEVICE_ATTR(fbregs_pnl, 0444, sm501fb_debug_show_pnl, NULL);
1244
1245 /* framebuffer ops */
1246
1247 static struct fb_ops sm501fb_ops_crt = {
1248         .owner          = THIS_MODULE,
1249         .fb_check_var   = sm501fb_check_var_crt,
1250         .fb_set_par     = sm501fb_set_par_crt,
1251         .fb_blank       = sm501fb_blank_crt,
1252         .fb_setcolreg   = sm501fb_setcolreg,
1253         .fb_pan_display = sm501fb_pan_crt,
1254         .fb_cursor      = sm501fb_cursor,
1255         .fb_fillrect    = cfb_fillrect,
1256         .fb_copyarea    = cfb_copyarea,
1257         .fb_imageblit   = cfb_imageblit,
1258 };
1259
1260 static struct fb_ops sm501fb_ops_pnl = {
1261         .owner          = THIS_MODULE,
1262         .fb_check_var   = sm501fb_check_var_pnl,
1263         .fb_set_par     = sm501fb_set_par_pnl,
1264         .fb_pan_display = sm501fb_pan_pnl,
1265         .fb_blank       = sm501fb_blank_pnl,
1266         .fb_setcolreg   = sm501fb_setcolreg,
1267         .fb_cursor      = sm501fb_cursor,
1268         .fb_fillrect    = cfb_fillrect,
1269         .fb_copyarea    = cfb_copyarea,
1270         .fb_imageblit   = cfb_imageblit,
1271 };
1272
1273 /* sm501_init_cursor
1274  *
1275  * initialise hw cursor parameters
1276 */
1277
1278 static int sm501_init_cursor(struct fb_info *fbi, unsigned int reg_base)
1279 {
1280         struct sm501fb_par *par;
1281         struct sm501fb_info *info;
1282         int ret;
1283
1284         if (fbi == NULL)
1285                 return 0;
1286
1287         par = fbi->par;
1288         info = par->info;
1289
1290         par->cursor_regs = info->regs + reg_base;
1291
1292         ret = sm501_alloc_mem(info, &par->cursor, SM501_MEMF_CURSOR, 1024);
1293         if (ret < 0)
1294                 return ret;
1295
1296         /* initialise the colour registers */
1297
1298         writel(par->cursor.sm_addr, par->cursor_regs + SM501_OFF_HWC_ADDR);
1299
1300         writel(0x00, par->cursor_regs + SM501_OFF_HWC_LOC);
1301         writel(0x00, par->cursor_regs + SM501_OFF_HWC_COLOR_1_2);
1302         writel(0x00, par->cursor_regs + SM501_OFF_HWC_COLOR_3);
1303         sm501fb_sync_regs(info);
1304
1305         return 0;
1306 }
1307
1308 /* sm501fb_info_start
1309  *
1310  * fills the par structure claiming resources and remapping etc.
1311 */
1312
1313 static int sm501fb_start(struct sm501fb_info *info,
1314                          struct platform_device *pdev)
1315 {
1316         struct resource *res;
1317         struct device *dev = &pdev->dev;
1318         int k;
1319         int ret;
1320
1321         info->irq = ret = platform_get_irq(pdev, 0);
1322         if (ret < 0) {
1323                 /* we currently do not use the IRQ */
1324                 dev_warn(dev, "no irq for device\n");
1325         }
1326
1327         /* allocate, reserve and remap resources for registers */
1328         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1329         if (res == NULL) {
1330                 dev_err(dev, "no resource definition for registers\n");
1331                 ret = -ENOENT;
1332                 goto err_release;
1333         }
1334
1335         info->regs_res = request_mem_region(res->start,
1336                                             res->end - res->start,
1337                                             pdev->name);
1338
1339         if (info->regs_res == NULL) {
1340                 dev_err(dev, "cannot claim registers\n");
1341                 ret = -ENXIO;
1342                 goto err_release;
1343         }
1344
1345         info->regs = ioremap(res->start, (res->end - res->start)+1);
1346         if (info->regs == NULL) {
1347                 dev_err(dev, "cannot remap registers\n");
1348                 ret = -ENXIO;
1349                 goto err_regs_res;
1350         }
1351
1352         /* allocate, reserve resources for framebuffer */
1353         res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
1354         if (res == NULL) {
1355                 dev_err(dev, "no memory resource defined\n");
1356                 ret = -ENXIO;
1357                 goto err_regs_map;
1358         }
1359
1360         info->fbmem_res = request_mem_region(res->start,
1361                                              (res->end - res->start)+1,
1362                                              pdev->name);
1363         if (info->fbmem_res == NULL) {
1364                 dev_err(dev, "cannot claim framebuffer\n");
1365                 ret = -ENXIO;
1366                 goto err_regs_map;
1367         }
1368
1369         info->fbmem = ioremap(res->start, (res->end - res->start)+1);
1370         if (info->fbmem == NULL) {
1371                 dev_err(dev, "cannot remap framebuffer\n");
1372                 goto err_mem_res;
1373         }
1374
1375         info->fbmem_len = (res->end - res->start)+1;
1376
1377         /* clear framebuffer memory - avoids garbage data on unused fb */
1378         memset(info->fbmem, 0, info->fbmem_len);
1379
1380         /* clear palette ram - undefined at power on */
1381         for (k = 0; k < (256 * 3); k++)
1382                 writel(0, info->regs + SM501_DC_PANEL_PALETTE + (k * 4));
1383
1384         /* enable display controller */
1385         sm501_unit_power(dev->parent, SM501_GATE_DISPLAY, 1);
1386
1387         /* setup cursors */
1388
1389         sm501_init_cursor(info->fb[HEAD_CRT], SM501_DC_CRT_HWC_ADDR);
1390         sm501_init_cursor(info->fb[HEAD_PANEL], SM501_DC_PANEL_HWC_ADDR);
1391
1392         return 0; /* everything is setup */
1393
1394  err_mem_res:
1395         release_resource(info->fbmem_res);
1396         kfree(info->fbmem_res);
1397
1398  err_regs_map:
1399         iounmap(info->regs);
1400
1401  err_regs_res:
1402         release_resource(info->regs_res);
1403         kfree(info->regs_res);
1404
1405  err_release:
1406         return ret;
1407 }
1408
1409 static void sm501fb_stop(struct sm501fb_info *info)
1410 {
1411         /* disable display controller */
1412         sm501_unit_power(info->dev->parent, SM501_GATE_DISPLAY, 0);
1413
1414         iounmap(info->fbmem);
1415         release_resource(info->fbmem_res);
1416         kfree(info->fbmem_res);
1417
1418         iounmap(info->regs);
1419         release_resource(info->regs_res);
1420         kfree(info->regs_res);
1421 }
1422
1423 static int sm501fb_init_fb(struct fb_info *fb,
1424                            enum sm501_controller head,
1425                            const char *fbname)
1426 {
1427         struct sm501_platdata_fbsub *pd;
1428         struct sm501fb_par *par = fb->par;
1429         struct sm501fb_info *info = par->info;
1430         unsigned long ctrl;
1431         unsigned int enable;
1432         int ret;
1433
1434         switch (head) {
1435         case HEAD_CRT:
1436                 pd = info->pdata->fb_crt;
1437                 ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
1438                 enable = (ctrl & SM501_DC_CRT_CONTROL_ENABLE) ? 1 : 0;
1439
1440                 /* ensure we set the correct source register */
1441                 if (info->pdata->fb_route != SM501_FB_CRT_PANEL) {
1442                         ctrl |= SM501_DC_CRT_CONTROL_SEL;
1443                         writel(ctrl, info->regs + SM501_DC_CRT_CONTROL);
1444                 }
1445
1446                 break;
1447
1448         case HEAD_PANEL:
1449                 pd = info->pdata->fb_pnl;
1450                 ctrl = readl(info->regs + SM501_DC_PANEL_CONTROL);
1451                 enable = (ctrl & SM501_DC_PANEL_CONTROL_EN) ? 1 : 0;
1452                 break;
1453
1454         default:
1455                 pd = NULL;              /* stop compiler warnings */
1456                 ctrl = 0;
1457                 enable = 0;
1458                 BUG();
1459         }
1460
1461         dev_info(info->dev, "fb %s %sabled at start\n",
1462                  fbname, enable ? "en" : "dis");
1463
1464         /* check to see if our routing allows this */
1465
1466         if (head == HEAD_CRT && info->pdata->fb_route == SM501_FB_CRT_PANEL) {
1467                 ctrl &= ~SM501_DC_CRT_CONTROL_SEL;
1468                 writel(ctrl, info->regs + SM501_DC_CRT_CONTROL);
1469                 enable = 0;
1470         }
1471
1472         strlcpy(fb->fix.id, fbname, sizeof(fb->fix.id));
1473
1474         memcpy(&par->ops,
1475                (head == HEAD_CRT) ? &sm501fb_ops_crt : &sm501fb_ops_pnl,
1476                sizeof(struct fb_ops));
1477
1478         /* update ops dependant on what we've been passed */
1479
1480         if ((pd->flags & SM501FB_FLAG_USE_HWCURSOR) == 0)
1481                 par->ops.fb_cursor = NULL;
1482
1483         fb->fbops = &par->ops;
1484         fb->flags = FBINFO_FLAG_DEFAULT |
1485                 FBINFO_HWACCEL_XPAN | FBINFO_HWACCEL_YPAN;
1486
1487         /* fixed data */
1488
1489         fb->fix.type            = FB_TYPE_PACKED_PIXELS;
1490         fb->fix.type_aux        = 0;
1491         fb->fix.xpanstep        = 1;
1492         fb->fix.ypanstep        = 1;
1493         fb->fix.ywrapstep       = 0;
1494         fb->fix.accel           = FB_ACCEL_NONE;
1495
1496         /* screenmode */
1497
1498         fb->var.nonstd          = 0;
1499         fb->var.activate        = FB_ACTIVATE_NOW;
1500         fb->var.accel_flags     = 0;
1501         fb->var.vmode           = FB_VMODE_NONINTERLACED;
1502         fb->var.bits_per_pixel  = 16;
1503
1504         if (enable && (pd->flags & SM501FB_FLAG_USE_INIT_MODE) && 0) {
1505                 /* TODO read the mode from the current display */
1506
1507         } else {
1508                 if (pd->def_mode) {
1509                         dev_info(info->dev, "using supplied mode\n");
1510                         fb_videomode_to_var(&fb->var, pd->def_mode);
1511
1512                         fb->var.bits_per_pixel = pd->def_bpp ? pd->def_bpp : 8;
1513                         fb->var.xres_virtual = fb->var.xres;
1514                         fb->var.yres_virtual = fb->var.yres;
1515                 } else {
1516                         ret = fb_find_mode(&fb->var, fb,
1517                                            NULL, NULL, 0, NULL, 8);
1518
1519                         if (ret == 0 || ret == 4) {
1520                                 dev_err(info->dev,
1521                                         "failed to get initial mode\n");
1522                                 return -EINVAL;
1523                         }
1524                 }
1525         }
1526
1527         /* initialise and set the palette */
1528         fb_alloc_cmap(&fb->cmap, NR_PALETTE, 0);
1529         fb_set_cmap(&fb->cmap, fb);
1530
1531         ret = (fb->fbops->fb_check_var)(&fb->var, fb);
1532         if (ret)
1533                 dev_err(info->dev, "check_var() failed on initial setup?\n");
1534
1535         /* ensure we've activated our new configuration */
1536         (fb->fbops->fb_set_par)(fb);
1537
1538         return 0;
1539 }
1540
1541 /* default platform data if none is supplied (ie, PCI device) */
1542
1543 static struct sm501_platdata_fbsub sm501fb_pdata_crt = {
1544         .flags          = (SM501FB_FLAG_USE_INIT_MODE |
1545                            SM501FB_FLAG_USE_HWCURSOR |
1546                            SM501FB_FLAG_USE_HWACCEL |
1547                            SM501FB_FLAG_DISABLE_AT_EXIT),
1548
1549 };
1550
1551 static struct sm501_platdata_fbsub sm501fb_pdata_pnl = {
1552         .flags          = (SM501FB_FLAG_USE_INIT_MODE |
1553                            SM501FB_FLAG_USE_HWCURSOR |
1554                            SM501FB_FLAG_USE_HWACCEL |
1555                            SM501FB_FLAG_DISABLE_AT_EXIT),
1556 };
1557
1558 static struct sm501_platdata_fb sm501fb_def_pdata = {
1559         .fb_route               = SM501_FB_OWN,
1560         .fb_crt                 = &sm501fb_pdata_crt,
1561         .fb_pnl                 = &sm501fb_pdata_pnl,
1562 };
1563
1564 static char driver_name_crt[] = "sm501fb-crt";
1565 static char driver_name_pnl[] = "sm501fb-panel";
1566
1567 static int __devinit sm501fb_probe_one(struct sm501fb_info *info,
1568                                        enum sm501_controller head)
1569 {
1570         unsigned char *name = (head == HEAD_CRT) ? "crt" : "panel";
1571         struct sm501_platdata_fbsub *pd;
1572         struct sm501fb_par *par;
1573         struct fb_info *fbi;
1574
1575         pd = (head == HEAD_CRT) ? info->pdata->fb_crt : info->pdata->fb_pnl;
1576
1577         /* Do not initialise if we've not been given any platform data */
1578         if (pd == NULL) {
1579                 dev_info(info->dev, "no data for fb %s (disabled)\n", name);
1580                 return 0;
1581         }
1582
1583         fbi = framebuffer_alloc(sizeof(struct sm501fb_par), info->dev);
1584         if (fbi == NULL) {
1585                 dev_err(info->dev, "cannot allocate %s framebuffer\n", name);
1586                 return -ENOMEM;
1587         }
1588
1589         par = fbi->par;
1590         par->info = info;
1591         par->head = head;
1592         fbi->pseudo_palette = &par->pseudo_palette;
1593
1594         info->fb[head] = fbi;
1595
1596         return 0;
1597 }
1598
1599 /* Free up anything allocated by sm501fb_init_fb */
1600
1601 static void sm501_free_init_fb(struct sm501fb_info *info,
1602                                 enum sm501_controller head)
1603 {
1604         struct fb_info *fbi = info->fb[head];
1605
1606         fb_dealloc_cmap(&fbi->cmap);
1607 }
1608
1609 static int __devinit sm501fb_start_one(struct sm501fb_info *info,
1610                                        enum sm501_controller head,
1611                                        const char *drvname)
1612 {
1613         struct fb_info *fbi = info->fb[head];
1614         int ret;
1615
1616         if (!fbi)
1617                 return 0;
1618
1619         ret = sm501fb_init_fb(info->fb[head], head, drvname);
1620         if (ret) {
1621                 dev_err(info->dev, "cannot initialise fb %s\n", drvname);
1622                 return ret;
1623         }
1624
1625         ret = register_framebuffer(info->fb[head]);
1626         if (ret) {
1627                 dev_err(info->dev, "failed to register fb %s\n", drvname);
1628                 sm501_free_init_fb(info, head);
1629                 return ret;
1630         }
1631
1632         dev_info(info->dev, "fb%d: %s frame buffer\n", fbi->node, fbi->fix.id);
1633
1634         return 0;
1635 }
1636
1637 static int __devinit sm501fb_probe(struct platform_device *pdev)
1638 {
1639         struct sm501fb_info *info;
1640         struct device *dev = &pdev->dev;
1641         int ret;
1642
1643         /* allocate our framebuffers */
1644
1645         info = kzalloc(sizeof(struct sm501fb_info), GFP_KERNEL);
1646         if (!info) {
1647                 dev_err(dev, "failed to allocate state\n");
1648                 return -ENOMEM;
1649         }
1650
1651         info->dev = dev = &pdev->dev;
1652         platform_set_drvdata(pdev, info);
1653
1654         if (dev->parent->platform_data) {
1655                 struct sm501_platdata *pd = dev->parent->platform_data;
1656                 info->pdata = pd->fb;
1657         }
1658
1659         if (info->pdata == NULL) {
1660                 dev_info(dev, "using default configuration data\n");
1661                 info->pdata = &sm501fb_def_pdata;
1662         }
1663
1664         /* probe for the presence of each panel */
1665
1666         ret = sm501fb_probe_one(info, HEAD_CRT);
1667         if (ret < 0) {
1668                 dev_err(dev, "failed to probe CRT\n");
1669                 goto err_alloc;
1670         }
1671
1672         ret = sm501fb_probe_one(info, HEAD_PANEL);
1673         if (ret < 0) {
1674                 dev_err(dev, "failed to probe PANEL\n");
1675                 goto err_probed_crt;
1676         }
1677
1678         if (info->fb[HEAD_PANEL] == NULL &&
1679             info->fb[HEAD_CRT] == NULL) {
1680                 dev_err(dev, "no framebuffers found\n");
1681                 goto err_alloc;
1682         }
1683
1684         /* get the resources for both of the framebuffers */
1685
1686         ret = sm501fb_start(info, pdev);
1687         if (ret) {
1688                 dev_err(dev, "cannot initialise SM501\n");
1689                 goto err_probed_panel;
1690         }
1691
1692         ret = sm501fb_start_one(info, HEAD_CRT, driver_name_crt);
1693         if (ret) {
1694                 dev_err(dev, "failed to start CRT\n");
1695                 goto err_started;
1696         }
1697
1698         ret = sm501fb_start_one(info, HEAD_PANEL, driver_name_pnl);
1699         if (ret) {
1700                 dev_err(dev, "failed to start Panel\n");
1701                 goto err_started_crt;
1702         }
1703
1704         /* create device files */
1705
1706         ret = device_create_file(dev, &dev_attr_crt_src);
1707         if (ret)
1708                 goto err_started_panel;
1709
1710         ret = device_create_file(dev, &dev_attr_fbregs_pnl);
1711         if (ret)
1712                 goto err_attached_crtsrc_file;
1713
1714         ret = device_create_file(dev, &dev_attr_fbregs_crt);
1715         if (ret)
1716                 goto err_attached_pnlregs_file;
1717
1718         /* we registered, return ok */
1719         return 0;
1720
1721 err_attached_pnlregs_file:
1722         device_remove_file(dev, &dev_attr_fbregs_pnl);
1723
1724 err_attached_crtsrc_file:
1725         device_remove_file(dev, &dev_attr_crt_src);
1726
1727 err_started_panel:
1728         unregister_framebuffer(info->fb[HEAD_PANEL]);
1729         sm501_free_init_fb(info, HEAD_PANEL);
1730
1731 err_started_crt:
1732         unregister_framebuffer(info->fb[HEAD_CRT]);
1733         sm501_free_init_fb(info, HEAD_CRT);
1734
1735 err_started:
1736         sm501fb_stop(info);
1737
1738 err_probed_panel:
1739         framebuffer_release(info->fb[HEAD_PANEL]);
1740
1741 err_probed_crt:
1742         framebuffer_release(info->fb[HEAD_CRT]);
1743
1744 err_alloc:
1745         kfree(info);
1746
1747         return ret;
1748 }
1749
1750
1751 /*
1752  *  Cleanup
1753  */
1754 static int sm501fb_remove(struct platform_device *pdev)
1755 {
1756         struct sm501fb_info *info = platform_get_drvdata(pdev);
1757         struct fb_info     *fbinfo_crt = info->fb[0];
1758         struct fb_info     *fbinfo_pnl = info->fb[1];
1759
1760         device_remove_file(&pdev->dev, &dev_attr_fbregs_crt);
1761         device_remove_file(&pdev->dev, &dev_attr_fbregs_pnl);
1762         device_remove_file(&pdev->dev, &dev_attr_crt_src);
1763
1764         sm501_free_init_fb(info, HEAD_CRT);
1765         sm501_free_init_fb(info, HEAD_PANEL);
1766
1767         unregister_framebuffer(fbinfo_crt);
1768         unregister_framebuffer(fbinfo_pnl);
1769
1770         sm501fb_stop(info);
1771         kfree(info);
1772
1773         framebuffer_release(fbinfo_pnl);
1774         framebuffer_release(fbinfo_crt);
1775
1776         return 0;
1777 }
1778
1779 #ifdef CONFIG_PM
1780
1781 static int sm501fb_suspend_fb(struct sm501fb_info *info,
1782                               enum sm501_controller head)
1783 {
1784         struct fb_info *fbi = info->fb[head];
1785         struct sm501fb_par *par = fbi->par;
1786
1787         if (par->screen.size == 0)
1788                 return 0;
1789
1790         /* blank the relevant interface to ensure unit power minimised */
1791         (par->ops.fb_blank)(FB_BLANK_POWERDOWN, fbi);
1792
1793         /* tell console/fb driver we are suspending */
1794
1795         acquire_console_sem();
1796         fb_set_suspend(fbi, 1);
1797         release_console_sem();
1798
1799         /* backup copies in case chip is powered down over suspend */
1800
1801         par->store_fb = vmalloc(par->screen.size);
1802         if (par->store_fb == NULL) {
1803                 dev_err(info->dev, "no memory to store screen\n");
1804                 return -ENOMEM;
1805         }
1806
1807         par->store_cursor = vmalloc(par->cursor.size);
1808         if (par->store_cursor == NULL) {
1809                 dev_err(info->dev, "no memory to store cursor\n");
1810                 goto err_nocursor;
1811         }
1812
1813         dev_dbg(info->dev, "suspending screen to %p\n", par->store_fb);
1814         dev_dbg(info->dev, "suspending cursor to %p\n", par->store_cursor);
1815
1816         memcpy_fromio(par->store_fb, par->screen.k_addr, par->screen.size);
1817         memcpy_fromio(par->store_cursor, par->cursor.k_addr, par->cursor.size);
1818
1819         return 0;
1820
1821  err_nocursor:
1822         vfree(par->store_fb);
1823         par->store_fb = NULL;
1824
1825         return -ENOMEM;
1826 }
1827
1828 static void sm501fb_resume_fb(struct sm501fb_info *info,
1829                               enum sm501_controller head)
1830 {
1831         struct fb_info *fbi = info->fb[head];
1832         struct sm501fb_par *par = fbi->par;
1833
1834         if (par->screen.size == 0)
1835                 return;
1836
1837         /* re-activate the configuration */
1838
1839         (par->ops.fb_set_par)(fbi);
1840
1841         /* restore the data */
1842
1843         dev_dbg(info->dev, "restoring screen from %p\n", par->store_fb);
1844         dev_dbg(info->dev, "restoring cursor from %p\n", par->store_cursor);
1845
1846         if (par->store_fb)
1847                 memcpy_toio(par->screen.k_addr, par->store_fb,
1848                             par->screen.size);
1849
1850         if (par->store_cursor)
1851                 memcpy_toio(par->cursor.k_addr, par->store_cursor,
1852                             par->cursor.size);
1853
1854         acquire_console_sem();
1855         fb_set_suspend(fbi, 0);
1856         release_console_sem();
1857
1858         vfree(par->store_fb);
1859         vfree(par->store_cursor);
1860 }
1861
1862
1863 /* suspend and resume support */
1864
1865 static int sm501fb_suspend(struct platform_device *pdev, pm_message_t state)
1866 {
1867         struct sm501fb_info *info = platform_get_drvdata(pdev);
1868
1869         /* store crt control to resume with */
1870         info->pm_crt_ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
1871
1872         sm501fb_suspend_fb(info, HEAD_CRT);
1873         sm501fb_suspend_fb(info, HEAD_PANEL);
1874
1875         /* turn off the clocks, in case the device is not powered down */
1876         sm501_unit_power(info->dev->parent, SM501_GATE_DISPLAY, 0);
1877
1878         return 0;
1879 }
1880
1881 #define SM501_CRT_CTRL_SAVE (SM501_DC_CRT_CONTROL_TVP |        \
1882                              SM501_DC_CRT_CONTROL_SEL)
1883
1884
1885 static int sm501fb_resume(struct platform_device *pdev)
1886 {
1887         struct sm501fb_info *info = platform_get_drvdata(pdev);
1888         unsigned long crt_ctrl;
1889
1890         sm501_unit_power(info->dev->parent, SM501_GATE_DISPLAY, 1);
1891
1892         /* restore the items we want to be saved for crt control */
1893
1894         crt_ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
1895         crt_ctrl &= ~SM501_CRT_CTRL_SAVE;
1896         crt_ctrl |= info->pm_crt_ctrl & SM501_CRT_CTRL_SAVE;
1897         writel(crt_ctrl, info->regs + SM501_DC_CRT_CONTROL);
1898
1899         sm501fb_resume_fb(info, HEAD_CRT);
1900         sm501fb_resume_fb(info, HEAD_PANEL);
1901
1902         return 0;
1903 }
1904
1905 #else
1906 #define sm501fb_suspend NULL
1907 #define sm501fb_resume  NULL
1908 #endif
1909
1910 static struct platform_driver sm501fb_driver = {
1911         .probe          = sm501fb_probe,
1912         .remove         = sm501fb_remove,
1913         .suspend        = sm501fb_suspend,
1914         .resume         = sm501fb_resume,
1915         .driver         = {
1916                 .name   = "sm501-fb",
1917                 .owner  = THIS_MODULE,
1918         },
1919 };
1920
1921 static int __devinit sm501fb_init(void)
1922 {
1923         return platform_driver_register(&sm501fb_driver);
1924 }
1925
1926 static void __exit sm501fb_cleanup(void)
1927 {
1928         platform_driver_unregister(&sm501fb_driver);
1929 }
1930
1931 module_init(sm501fb_init);
1932 module_exit(sm501fb_cleanup);
1933
1934 MODULE_AUTHOR("Ben Dooks, Vincent Sanders");
1935 MODULE_DESCRIPTION("SM501 Framebuffer driver");
1936 MODULE_LICENSE("GPL v2");