drivers/video/fbdev/sm501fb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* linux/drivers/video/sm501fb.c
   3  *
   4  * Copyright (c) 2006 Simtec Electronics
   5  *      Vincent Sanders <vince@simtec.co.uk>
   6  *      Ben Dooks <ben@simtec.co.uk>
   7  *
   8  * Framebuffer driver for the Silicon Motion SM501
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/string.h>
  15 #include <linux/mm.h>
  16 #include <linux/tty.h>
  17 #include <linux/slab.h>
  18 #include <linux/delay.h>
  19 #include <linux/fb.h>
  20 #include <linux/init.h>
  21 #include <linux/vmalloc.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/wait.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/clk.h>
  28 #include <linux/console.h>
  29 #include <linux/io.h>
  30
  31 #include <linux/uaccess.h>
  32 #include <asm/div64.h>
  33
  34 #ifdef CONFIG_PM
  35 #include <linux/pm.h>
  36 #endif
  37
  38 #include <linux/sm501.h>
  39 #include <linux/sm501-regs.h>
  40
  41 #include "edid.h"
  42
  43 static char *fb_mode = "640x480-16@60";
  44 static unsigned long default_bpp = 16;
  45
  46 static const struct fb_videomode sm501_default_mode = {
  47         .refresh        = 60,
  48         .xres           = 640,
  49         .yres           = 480,
  50         .pixclock       = 20833,
  51         .left_margin    = 142,
  52         .right_margin   = 13,
  53         .upper_margin   = 21,
  54         .lower_margin   = 1,
  55         .hsync_len      = 69,
  56         .vsync_len      = 3,
  57         .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  58         .vmode          = FB_VMODE_NONINTERLACED
  59 };
  60
  61 #define NR_PALETTE      256
  62
  63 enum sm501_controller {
  64         HEAD_CRT        = 0,
  65         HEAD_PANEL      = 1,
  66 };
  67
  68 /* SM501 memory address.
  69  *
  70  * This structure is used to track memory usage within the SM501 framebuffer
  71  * allocation. The sm_addr field is stored as an offset as it is often used
  72  * against both the physical and mapped addresses.
  73  */
  74 struct sm501_mem {
  75         unsigned long    size;
  76         unsigned long    sm_addr;       /* offset from base of sm501 fb. */
  77         void __iomem    *k_addr;
  78 };
  79
  80 /* private data that is shared between all frambuffers* */
  81 struct sm501fb_info {
  82         struct device           *dev;
  83         struct fb_info          *fb[2];         /* fb info for both heads */
  84         struct resource         *fbmem_res;     /* framebuffer resource */
  85         struct resource         *regs_res;      /* registers resource */
  86         struct resource         *regs2d_res;    /* 2d registers resource */
  87         struct sm501_platdata_fb *pdata;        /* our platform data */
  88
  89         unsigned long            pm_crt_ctrl;   /* pm: crt ctrl save */
  90
  91         int                      irq;
  92         int                      swap_endian;   /* set to swap rgb=>bgr */
  93         void __iomem            *regs;          /* remapped registers */
  94         void __iomem            *regs2d;        /* 2d remapped registers */
  95         void __iomem            *fbmem;         /* remapped framebuffer */
  96         size_t                   fbmem_len;     /* length of remapped region */
  97         u8 *edid_data;
  98 };
  99
 100 /* per-framebuffer private data */
 101 struct sm501fb_par {
 102         u32                      pseudo_palette[16];
 103
 104         enum sm501_controller    head;
 105         struct sm501_mem         cursor;
 106         struct sm501_mem         screen;
 107         struct fb_ops            ops;
 108
 109         void                    *store_fb;
 110         void                    *store_cursor;
 111         void __iomem            *cursor_regs;
 112         struct sm501fb_info     *info;
 113 };
 114
 115 /* Helper functions */
 116
 117 static inline int h_total(struct fb_var_screeninfo *var)
 118 {
 119         return var->xres + var->left_margin +
 120                 var->right_margin + var->hsync_len;
 121 }
 122
 123 static inline int v_total(struct fb_var_screeninfo *var)
 124 {
 125         return var->yres + var->upper_margin +
 126                 var->lower_margin + var->vsync_len;
 127 }
 128
 129 /* sm501fb_sync_regs()
 130  *
 131  * This call is mainly for PCI bus systems where we need to
 132  * ensure that any writes to the bus are completed before the
 133  * next phase, or after completing a function.
 134 */
 135
 136 static inline void sm501fb_sync_regs(struct sm501fb_info *info)
 137 {
 138         smc501_readl(info->regs);
 139 }
 140
 141 /* sm501_alloc_mem
 142  *
 143  * This is an attempt to lay out memory for the two framebuffers and
 144  * everything else
 145  *
 146  * |fbmem_res->start                                           fbmem_res->end|
 147  * |                                                                         |
 148  * |fb[0].fix.smem_start    |         |fb[1].fix.smem_start    |     2K      |
 149  * |-> fb[0].fix.smem_len <-| spare   |-> fb[1].fix.smem_len <-|-> cursors <-|
 150  *
 151  * The "spare" space is for the 2d engine data
 152  * the fixed is space for the cursors (2x1Kbyte)
 153  *
 154  * we need to allocate memory for the 2D acceleration engine
 155  * command list and the data for the engine to deal with.
 156  *
 157  * - all allocations must be 128bit aligned
 158  * - cursors are 64x64x2 bits (1Kbyte)
 159  *
 160  */
 161
 162 #define SM501_MEMF_CURSOR               (1)
 163 #define SM501_MEMF_PANEL                (2)
 164 #define SM501_MEMF_CRT                  (4)
 165 #define SM501_MEMF_ACCEL                (8)
 166
 167 static int sm501_alloc_mem(struct sm501fb_info *inf, struct sm501_mem *mem,
 168                            unsigned int why, size_t size, u32 smem_len)
 169 {
 170         struct sm501fb_par *par;
 171         struct fb_info *fbi;
 172         unsigned int ptr;
 173         unsigned int end;
 174
 175         switch (why) {
 176         case SM501_MEMF_CURSOR:
 177                 ptr = inf->fbmem_len - size;
 178                 inf->fbmem_len = ptr;   /* adjust available memory. */
 179                 break;
 180
 181         case SM501_MEMF_PANEL:
 182                 if (size > inf->fbmem_len)
 183                         return -ENOMEM;
 184
 185                 ptr = inf->fbmem_len - size;
 186                 fbi = inf->fb[HEAD_CRT];
 187
 188                 /* round down, some programs such as directfb do not draw
 189                  * 0,0 correctly unless the start is aligned to a page start.
 190                  */
 191
 192                 if (ptr > 0)
 193                         ptr &= ~(PAGE_SIZE - 1);
 194
 195                 if (fbi && ptr < smem_len)
 196                         return -ENOMEM;
 197
 198                 break;
 199
 200         case SM501_MEMF_CRT:
 201                 ptr = 0;
 202
 203                 /* check to see if we have panel memory allocated
 204                  * which would put an limit on available memory. */
 205
 206                 fbi = inf->fb[HEAD_PANEL];
 207                 if (fbi) {
 208                         par = fbi->par;
 209                         end = par->screen.k_addr ? par->screen.sm_addr : inf->fbmem_len;
 210                 } else
 211                         end = inf->fbmem_len;
 212
 213                 if ((ptr + size) > end)
 214                         return -ENOMEM;
 215
 216                 break;
 217
 218         case SM501_MEMF_ACCEL:
 219                 fbi = inf->fb[HEAD_CRT];
 220                 ptr = fbi ? smem_len : 0;
 221
 222                 fbi = inf->fb[HEAD_PANEL];
 223                 if (fbi) {
 224                         par = fbi->par;
 225                         end = par->screen.sm_addr;
 226                 } else
 227                         end = inf->fbmem_len;
 228
 229                 if ((ptr + size) > end)
 230                         return -ENOMEM;
 231
 232                 break;
 233
 234         default:
 235                 return -EINVAL;
 236         }
 237
 238         mem->size    = size;
 239         mem->sm_addr = ptr;
 240         mem->k_addr  = inf->fbmem + ptr;
 241
 242         dev_dbg(inf->dev, "%s: result %08lx, %p - %u, %zd\n",
 243                 __func__, mem->sm_addr, mem->k_addr, why, size);
 244
 245         return 0;
 246 }
 247
 248 /* sm501fb_ps_to_hz
 249  *
 250  * Converts a period in picoseconds to Hz.
 251  *
 252  * Note, we try to keep this in Hz to minimise rounding with
 253  * the limited PLL settings on the SM501.
 254 */
 255
 256 static unsigned long sm501fb_ps_to_hz(unsigned long psvalue)
 257 {
 258         unsigned long long numerator=1000000000000ULL;
 259
 260         /* 10^12 / picosecond period gives frequency in Hz */
 261         do_div(numerator, psvalue);
 262         return (unsigned long)numerator;
 263 }
 264
 265 /* sm501fb_hz_to_ps is identical to the opposite transform */
 266
 267 #define sm501fb_hz_to_ps(x) sm501fb_ps_to_hz(x)
 268
 269 /* sm501fb_setup_gamma
 270  *
 271  * Programs a linear 1.0 gamma ramp in case the gamma
 272  * correction is enabled without programming anything else.
 273 */
 274
 275 static void sm501fb_setup_gamma(struct sm501fb_info *fbi,
 276                                 unsigned long palette)
 277 {
 278         unsigned long value = 0;
 279         int offset;
 280
 281         /* set gamma values */
 282         for (offset = 0; offset < 256 * 4; offset += 4) {
 283                 smc501_writel(value, fbi->regs + palette + offset);
 284                 value += 0x010101;      /* Advance RGB by 1,1,1.*/
 285         }
 286 }
 287
 288 /* sm501fb_check_var
 289  *
 290  * check common variables for both panel and crt
 291 */
 292
 293 static int sm501fb_check_var(struct fb_var_screeninfo *var,
 294                              struct fb_info *info)
 295 {
 296         struct sm501fb_par  *par = info->par;
 297         struct sm501fb_info *sm  = par->info;
 298         unsigned long tmp;
 299
 300         /* check we can fit these values into the registers */
 301
 302         if (var->hsync_len > 255 || var->vsync_len > 63)
 303                 return -EINVAL;
 304
 305         /* hdisplay end and hsync start */
 306         if ((var->xres + var->right_margin) > 4096)
 307                 return -EINVAL;
 308
 309         /* vdisplay end and vsync start */
 310         if ((var->yres + var->lower_margin) > 2048)
 311                 return -EINVAL;
 312
 313         /* hard limits of device */
 314
 315         if (h_total(var) > 4096 || v_total(var) > 2048)
 316                 return -EINVAL;
 317
 318         /* check our line length is going to be 128 bit aligned */
 319
 320         tmp = (var->xres * var->bits_per_pixel) / 8;
 321         if ((tmp & 15) != 0)
 322                 return -EINVAL;
 323
 324         /* check the virtual size */
 325
 326         if (var->xres_virtual > 4096 || var->yres_virtual > 2048)
 327                 return -EINVAL;
 328
 329         /* can cope with 8,16 or 32bpp */
 330
 331         if (var->bits_per_pixel <= 8)
 332                 var->bits_per_pixel = 8;
 333         else if (var->bits_per_pixel <= 16)
 334                 var->bits_per_pixel = 16;
 335         else if (var->bits_per_pixel == 24)
 336                 var->bits_per_pixel = 32;
 337
 338         /* set r/g/b positions and validate bpp */
 339         switch(var->bits_per_pixel) {
 340         case 8:
 341                 var->red.length         = var->bits_per_pixel;
 342                 var->red.offset         = 0;
 343                 var->green.length       = var->bits_per_pixel;
 344                 var->green.offset       = 0;
 345                 var->blue.length        = var->bits_per_pixel;
 346                 var->blue.offset        = 0;
 347                 var->transp.length      = 0;
 348                 var->transp.offset      = 0;
 349
 350                 break;
 351
 352         case 16:
 353                 if (sm->pdata->flags & SM501_FBPD_SWAP_FB_ENDIAN) {
 354                         var->blue.offset        = 11;
 355                         var->green.offset       = 5;
 356                         var->red.offset         = 0;
 357                 } else {
 358                         var->red.offset         = 11;
 359                         var->green.offset       = 5;
 360                         var->blue.offset        = 0;
 361                 }
 362                 var->transp.offset      = 0;
 363
 364                 var->red.length         = 5;
 365                 var->green.length       = 6;
 366                 var->blue.length        = 5;
 367                 var->transp.length      = 0;
 368                 break;
 369
 370         case 32:
 371                 if (sm->pdata->flags & SM501_FBPD_SWAP_FB_ENDIAN) {
 372                         var->transp.offset      = 0;
 373                         var->red.offset         = 8;
 374                         var->green.offset       = 16;
 375                         var->blue.offset        = 24;
 376                 } else {
 377                         var->transp.offset      = 24;
 378                         var->red.offset         = 16;
 379                         var->green.offset       = 8;
 380                         var->blue.offset        = 0;
 381                 }
 382
 383                 var->red.length         = 8;
 384                 var->green.length       = 8;
 385                 var->blue.length        = 8;
 386                 var->transp.length      = 0;
 387                 break;
 388
 389         default:
 390                 return -EINVAL;
 391         }
 392
 393         return 0;
 394 }
 395
 396 /*
 397  * sm501fb_check_var_crt():
 398  *
 399  * check the parameters for the CRT head, and either bring them
 400  * back into range, or return -EINVAL.
 401 */
 402
 403 static int sm501fb_check_var_crt(struct fb_var_screeninfo *var,
 404                                  struct fb_info *info)
 405 {
 406         return sm501fb_check_var(var, info);
 407 }
 408
 409 /* sm501fb_check_var_pnl():
 410  *
 411  * check the parameters for the CRT head, and either bring them
 412  * back into range, or return -EINVAL.
 413 */
 414
 415 static int sm501fb_check_var_pnl(struct fb_var_screeninfo *var,
 416                                  struct fb_info *info)
 417 {
 418         return sm501fb_check_var(var, info);
 419 }
 420
 421 /* sm501fb_set_par_common
 422  *
 423  * set common registers for framebuffers
 424 */
 425
 426 static int sm501fb_set_par_common(struct fb_info *info,
 427                                   struct fb_var_screeninfo *var)
 428 {
 429         struct sm501fb_par  *par = info->par;
 430         struct sm501fb_info *fbi = par->info;
 431         unsigned long pixclock;      /* pixelclock in Hz */
 432         unsigned long sm501pixclock; /* pixelclock the 501 can achieve in Hz */
 433         unsigned int mem_type;
 434         unsigned int clock_type;
 435         unsigned int head_addr;
 436         unsigned int smem_len;
 437
 438         dev_dbg(fbi->dev, "%s: %dx%d, bpp = %d, virtual %dx%d\n",
 439                 __func__, var->xres, var->yres, var->bits_per_pixel,
 440                 var->xres_virtual, var->yres_virtual);
 441
 442         switch (par->head) {
 443         case HEAD_CRT:
 444                 mem_type = SM501_MEMF_CRT;
 445                 clock_type = SM501_CLOCK_V2XCLK;
 446                 head_addr = SM501_DC_CRT_FB_ADDR;
 447                 break;
 448
 449         case HEAD_PANEL:
 450                 mem_type = SM501_MEMF_PANEL;
 451                 clock_type = SM501_CLOCK_P2XCLK;
 452                 head_addr = SM501_DC_PANEL_FB_ADDR;
 453                 break;
 454
 455         default:
 456                 mem_type = 0;           /* stop compiler warnings */
 457                 head_addr = 0;
 458                 clock_type = 0;
 459         }
 460
 461         switch (var->bits_per_pixel) {
 462         case 8:
 463                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 464                 break;
 465
 466         case 16:
 467                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 468                 break;
 469
 470         case 32:
 471                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 472                 break;
 473         }
 474
 475         /* allocate fb memory within 501 */
 476         info->fix.line_length = (var->xres_virtual * var->bits_per_pixel)/8;
 477         smem_len = info->fix.line_length * var->yres_virtual;
 478
 479         dev_dbg(fbi->dev, "%s: line length = %u\n", __func__,
 480                 info->fix.line_length);
 481
 482         if (sm501_alloc_mem(fbi, &par->screen, mem_type, smem_len, smem_len)) {
 483                 dev_err(fbi->dev, "no memory available\n");
 484                 return -ENOMEM;
 485         }
 486
 487         mutex_lock(&info->mm_lock);
 488         info->fix.smem_start = fbi->fbmem_res->start + par->screen.sm_addr;
 489         info->fix.smem_len   = smem_len;
 490         mutex_unlock(&info->mm_lock);
 491
 492         info->screen_base = fbi->fbmem + par->screen.sm_addr;
 493         info->screen_size = info->fix.smem_len;
 494
 495         /* set start of framebuffer to the screen */
 496
 497         smc501_writel(par->screen.sm_addr | SM501_ADDR_FLIP,
 498                         fbi->regs + head_addr);
 499
 500         /* program CRT clock  */
 501
 502         pixclock = sm501fb_ps_to_hz(var->pixclock);
 503
 504         sm501pixclock = sm501_set_clock(fbi->dev->parent, clock_type,
 505                                         pixclock);
 506
 507         /* update fb layer with actual clock used */
 508         var->pixclock = sm501fb_hz_to_ps(sm501pixclock);
 509
 510         dev_dbg(fbi->dev, "%s: pixclock(ps) = %u, pixclock(Hz)  = %lu, "
 511                "sm501pixclock = %lu,  error = %ld%%\n",
 512                __func__, var->pixclock, pixclock, sm501pixclock,
 513                ((pixclock - sm501pixclock)*100)/pixclock);
 514
 515         return 0;
 516 }
 517
 518 /* sm501fb_set_par_geometry
 519  *
 520  * set the geometry registers for specified framebuffer.
 521 */
 522
 523 static void sm501fb_set_par_geometry(struct fb_info *info,
 524                                      struct fb_var_screeninfo *var)
 525 {
 526         struct sm501fb_par  *par = info->par;
 527         struct sm501fb_info *fbi = par->info;
 528         void __iomem *base = fbi->regs;
 529         unsigned long reg;
 530
 531         if (par->head == HEAD_CRT)
 532                 base += SM501_DC_CRT_H_TOT;
 533         else
 534                 base += SM501_DC_PANEL_H_TOT;
 535
 536         /* set framebuffer width and display width */
 537
 538         reg = info->fix.line_length;
 539         reg |= ((var->xres * var->bits_per_pixel)/8) << 16;
 540
 541         smc501_writel(reg, fbi->regs + (par->head == HEAD_CRT ?
 542                     SM501_DC_CRT_FB_OFFSET :  SM501_DC_PANEL_FB_OFFSET));
 543
 544         /* program horizontal total */
 545
 546         reg  = (h_total(var) - 1) << 16;
 547         reg |= (var->xres - 1);
 548
 549         smc501_writel(reg, base + SM501_OFF_DC_H_TOT);
 550
 551         /* program horizontal sync */
 552
 553         reg  = var->hsync_len << 16;
 554         reg |= var->xres + var->right_margin - 1;
 555
 556         smc501_writel(reg, base + SM501_OFF_DC_H_SYNC);
 557
 558         /* program vertical total */
 559
 560         reg  = (v_total(var) - 1) << 16;
 561         reg |= (var->yres - 1);
 562
 563         smc501_writel(reg, base + SM501_OFF_DC_V_TOT);
 564
 565         /* program vertical sync */
 566         reg  = var->vsync_len << 16;
 567         reg |= var->yres + var->lower_margin - 1;
 568
 569         smc501_writel(reg, base + SM501_OFF_DC_V_SYNC);
 570 }
 571
 572 /* sm501fb_pan_crt
 573  *
 574  * pan the CRT display output within an virtual framebuffer
 575 */
 576
 577 static int sm501fb_pan_crt(struct fb_var_screeninfo *var,
 578                            struct fb_info *info)
 579 {
 580         struct sm501fb_par  *par = info->par;
 581         struct sm501fb_info *fbi = par->info;
 582         unsigned int bytes_pixel = info->var.bits_per_pixel / 8;
 583         unsigned long reg;
 584         unsigned long xoffs;
 585
 586         xoffs = var->xoffset * bytes_pixel;
 587
 588         reg = smc501_readl(fbi->regs + SM501_DC_CRT_CONTROL);
 589
 590         reg &= ~SM501_DC_CRT_CONTROL_PIXEL_MASK;
 591         reg |= ((xoffs & 15) / bytes_pixel) << 4;
 592         smc501_writel(reg, fbi->regs + SM501_DC_CRT_CONTROL);
 593
 594         reg = (par->screen.sm_addr + xoffs +
 595                var->yoffset * info->fix.line_length);
 596         smc501_writel(reg | SM501_ADDR_FLIP, fbi->regs + SM501_DC_CRT_FB_ADDR);
 597
 598         sm501fb_sync_regs(fbi);
 599         return 0;
 600 }
 601
 602 /* sm501fb_pan_pnl
 603  *
 604  * pan the panel display output within an virtual framebuffer
 605 */
 606
 607 static int sm501fb_pan_pnl(struct fb_var_screeninfo *var,
 608                            struct fb_info *info)
 609 {
 610         struct sm501fb_par  *par = info->par;
 611         struct sm501fb_info *fbi = par->info;
 612         unsigned long reg;
 613
 614         reg = var->xoffset | (info->var.xres_virtual << 16);
 615         smc501_writel(reg, fbi->regs + SM501_DC_PANEL_FB_WIDTH);
 616
 617         reg = var->yoffset | (info->var.yres_virtual << 16);
 618         smc501_writel(reg, fbi->regs + SM501_DC_PANEL_FB_HEIGHT);
 619
 620         sm501fb_sync_regs(fbi);
 621         return 0;
 622 }
 623
 624 /* sm501fb_set_par_crt
 625  *
 626  * Set the CRT video mode from the fb_info structure
 627 */
 628
 629 static int sm501fb_set_par_crt(struct fb_info *info)
 630 {
 631         struct sm501fb_par  *par = info->par;
 632         struct sm501fb_info *fbi = par->info;
 633         struct fb_var_screeninfo *var = &info->var;
 634         unsigned long control;       /* control register */
 635         int ret;
 636
 637         /* activate new configuration */
 638
 639         dev_dbg(fbi->dev, "%s(%p)\n", __func__, info);
 640
 641         /* enable CRT DAC - note 0 is on!*/
 642         sm501_misc_control(fbi->dev->parent, 0, SM501_MISC_DAC_POWER);
 643
 644         control = smc501_readl(fbi->regs + SM501_DC_CRT_CONTROL);
 645
 646         control &= (SM501_DC_CRT_CONTROL_PIXEL_MASK |
 647                     SM501_DC_CRT_CONTROL_GAMMA |
 648                     SM501_DC_CRT_CONTROL_BLANK |
 649                     SM501_DC_CRT_CONTROL_SEL |
 650                     SM501_DC_CRT_CONTROL_CP |
 651                     SM501_DC_CRT_CONTROL_TVP);
 652
 653         /* set the sync polarities before we check data source  */
 654
 655         if ((var->sync & FB_SYNC_HOR_HIGH_ACT) == 0)
 656                 control |= SM501_DC_CRT_CONTROL_HSP;
 657
 658         if ((var->sync & FB_SYNC_VERT_HIGH_ACT) == 0)
 659                 control |= SM501_DC_CRT_CONTROL_VSP;
 660
 661         if ((control & SM501_DC_CRT_CONTROL_SEL) == 0) {
 662                 /* the head is displaying panel data... */
 663
 664                 sm501_alloc_mem(fbi, &par->screen, SM501_MEMF_CRT, 0,
 665                                 info->fix.smem_len);
 666                 goto out_update;
 667         }
 668
 669         ret = sm501fb_set_par_common(info, var);
 670         if (ret) {
 671                 dev_err(fbi->dev, "failed to set common parameters\n");
 672                 return ret;
 673         }
 674
 675         sm501fb_pan_crt(var, info);
 676         sm501fb_set_par_geometry(info, var);
 677
 678         control |= SM501_FIFO_3;        /* fill if >3 free slots */
 679
 680         switch(var->bits_per_pixel) {
 681         case 8:
 682                 control |= SM501_DC_CRT_CONTROL_8BPP;
 683                 break;
 684
 685         case 16:
 686                 control |= SM501_DC_CRT_CONTROL_16BPP;
 687                 sm501fb_setup_gamma(fbi, SM501_DC_CRT_PALETTE);
 688                 break;
 689
 690         case 32:
 691                 control |= SM501_DC_CRT_CONTROL_32BPP;
 692                 sm501fb_setup_gamma(fbi, SM501_DC_CRT_PALETTE);
 693                 break;
 694
 695         default:
 696                 BUG();
 697         }
 698
 699         control |= SM501_DC_CRT_CONTROL_SEL;    /* CRT displays CRT data */
 700         control |= SM501_DC_CRT_CONTROL_TE;     /* enable CRT timing */
 701         control |= SM501_DC_CRT_CONTROL_ENABLE; /* enable CRT plane */
 702
 703  out_update:
 704         dev_dbg(fbi->dev, "new control is %08lx\n", control);
 705
 706         smc501_writel(control, fbi->regs + SM501_DC_CRT_CONTROL);
 707         sm501fb_sync_regs(fbi);
 708
 709         return 0;
 710 }
 711
 712 static void sm501fb_panel_power(struct sm501fb_info *fbi, int to)
 713 {
 714         unsigned long control;
 715         void __iomem *ctrl_reg = fbi->regs + SM501_DC_PANEL_CONTROL;
 716         struct sm501_platdata_fbsub *pd = fbi->pdata->fb_pnl;
 717
 718         control = smc501_readl(ctrl_reg);
 719
 720         if (to && (control & SM501_DC_PANEL_CONTROL_VDD) == 0) {
 721                 /* enable panel power */
 722
 723                 control |= SM501_DC_PANEL_CONTROL_VDD;  /* FPVDDEN */
 724                 smc501_writel(control, ctrl_reg);
 725                 sm501fb_sync_regs(fbi);
 726                 mdelay(10);
 727
 728                 control |= SM501_DC_PANEL_CONTROL_DATA; /* DATA */
 729                 smc501_writel(control, ctrl_reg);
 730                 sm501fb_sync_regs(fbi);
 731                 mdelay(10);
 732
 733                 /* VBIASEN */
 734
 735                 if (!(pd->flags & SM501FB_FLAG_PANEL_NO_VBIASEN)) {
 736                         if (pd->flags & SM501FB_FLAG_PANEL_INV_VBIASEN)
 737                                 control &= ~SM501_DC_PANEL_CONTROL_BIAS;
 738                         else
 739                                 control |= SM501_DC_PANEL_CONTROL_BIAS;
 740
 741                         smc501_writel(control, ctrl_reg);
 742                         sm501fb_sync_regs(fbi);
 743                         mdelay(10);
 744                 }
 745
 746                 if (!(pd->flags & SM501FB_FLAG_PANEL_NO_FPEN)) {
 747                         if (pd->flags & SM501FB_FLAG_PANEL_INV_FPEN)
 748                                 control &= ~SM501_DC_PANEL_CONTROL_FPEN;
 749                         else
 750                                 control |= SM501_DC_PANEL_CONTROL_FPEN;
 751
 752                         smc501_writel(control, ctrl_reg);
 753                         sm501fb_sync_regs(fbi);
 754                         mdelay(10);
 755                 }
 756         } else if (!to && (control & SM501_DC_PANEL_CONTROL_VDD) != 0) {
 757                 /* disable panel power */
 758                 if (!(pd->flags & SM501FB_FLAG_PANEL_NO_FPEN)) {
 759                         if (pd->flags & SM501FB_FLAG_PANEL_INV_FPEN)
 760                                 control |= SM501_DC_PANEL_CONTROL_FPEN;
 761                         else
 762                                 control &= ~SM501_DC_PANEL_CONTROL_FPEN;
 763
 764                         smc501_writel(control, ctrl_reg);
 765                         sm501fb_sync_regs(fbi);
 766                         mdelay(10);
 767                 }
 768
 769                 if (!(pd->flags & SM501FB_FLAG_PANEL_NO_VBIASEN)) {
 770                         if (pd->flags & SM501FB_FLAG_PANEL_INV_VBIASEN)
 771                                 control |= SM501_DC_PANEL_CONTROL_BIAS;
 772                         else
 773                                 control &= ~SM501_DC_PANEL_CONTROL_BIAS;
 774
 775                         smc501_writel(control, ctrl_reg);
 776                         sm501fb_sync_regs(fbi);
 777                         mdelay(10);
 778                 }
 779
 780                 control &= ~SM501_DC_PANEL_CONTROL_DATA;
 781                 smc501_writel(control, ctrl_reg);
 782                 sm501fb_sync_regs(fbi);
 783                 mdelay(10);
 784
 785                 control &= ~SM501_DC_PANEL_CONTROL_VDD;
 786                 smc501_writel(control, ctrl_reg);
 787                 sm501fb_sync_regs(fbi);
 788                 mdelay(10);
 789         }
 790
 791         sm501fb_sync_regs(fbi);
 792 }
 793
 794 /* sm501fb_set_par_pnl
 795  *
 796  * Set the panel video mode from the fb_info structure
 797 */
 798
 799 static int sm501fb_set_par_pnl(struct fb_info *info)
 800 {
 801         struct sm501fb_par  *par = info->par;
 802         struct sm501fb_info *fbi = par->info;
 803         struct fb_var_screeninfo *var = &info->var;
 804         unsigned long control;
 805         unsigned long reg;
 806         int ret;
 807
 808         dev_dbg(fbi->dev, "%s(%p)\n", __func__, info);
 809
 810         /* activate this new configuration */
 811
 812         ret = sm501fb_set_par_common(info, var);
 813         if (ret)
 814                 return ret;
 815
 816         sm501fb_pan_pnl(var, info);
 817         sm501fb_set_par_geometry(info, var);
 818
 819         /* update control register */
 820
 821         control = smc501_readl(fbi->regs + SM501_DC_PANEL_CONTROL);
 822         control &= (SM501_DC_PANEL_CONTROL_GAMMA |
 823                     SM501_DC_PANEL_CONTROL_VDD  |
 824                     SM501_DC_PANEL_CONTROL_DATA |
 825                     SM501_DC_PANEL_CONTROL_BIAS |
 826                     SM501_DC_PANEL_CONTROL_FPEN |
 827                     SM501_DC_PANEL_CONTROL_CP |
 828                     SM501_DC_PANEL_CONTROL_CK |
 829                     SM501_DC_PANEL_CONTROL_HP |
 830                     SM501_DC_PANEL_CONTROL_VP |
 831                     SM501_DC_PANEL_CONTROL_HPD |
 832                     SM501_DC_PANEL_CONTROL_VPD);
 833
 834         control |= SM501_FIFO_3;        /* fill if >3 free slots */
 835
 836         switch(var->bits_per_pixel) {
 837         case 8:
 838                 control |= SM501_DC_PANEL_CONTROL_8BPP;
 839                 break;
 840
 841         case 16:
 842                 control |= SM501_DC_PANEL_CONTROL_16BPP;
 843                 sm501fb_setup_gamma(fbi, SM501_DC_PANEL_PALETTE);
 844                 break;
 845
 846         case 32:
 847                 control |= SM501_DC_PANEL_CONTROL_32BPP;
 848                 sm501fb_setup_gamma(fbi, SM501_DC_PANEL_PALETTE);
 849                 break;
 850
 851         default:
 852                 BUG();
 853         }
 854
 855         smc501_writel(0x0, fbi->regs + SM501_DC_PANEL_PANNING_CONTROL);
 856
 857         /* panel plane top left and bottom right location */
 858
 859         smc501_writel(0x00, fbi->regs + SM501_DC_PANEL_TL_LOC);
 860
 861         reg  = var->xres - 1;
 862         reg |= (var->yres - 1) << 16;
 863
 864         smc501_writel(reg, fbi->regs + SM501_DC_PANEL_BR_LOC);
 865
 866         /* program panel control register */
 867
 868         control |= SM501_DC_PANEL_CONTROL_TE;   /* enable PANEL timing */
 869         control |= SM501_DC_PANEL_CONTROL_EN;   /* enable PANEL gfx plane */
 870
 871         if ((var->sync & FB_SYNC_HOR_HIGH_ACT) == 0)
 872                 control |= SM501_DC_PANEL_CONTROL_HSP;
 873
 874         if ((var->sync & FB_SYNC_VERT_HIGH_ACT) == 0)
 875                 control |= SM501_DC_PANEL_CONTROL_VSP;
 876
 877         smc501_writel(control, fbi->regs + SM501_DC_PANEL_CONTROL);
 878         sm501fb_sync_regs(fbi);
 879
 880         /* ensure the panel interface is not tristated at this point */
 881
 882         sm501_modify_reg(fbi->dev->parent, SM501_SYSTEM_CONTROL,
 883                          0, SM501_SYSCTRL_PANEL_TRISTATE);
 884
 885         /* power the panel up */
 886         sm501fb_panel_power(fbi, 1);
 887         return 0;
 888 }
 889
 890
 891 /* chan_to_field
 892  *
 893  * convert a colour value into a field position
 894  *
 895  * from pxafb.c
 896 */
 897
 898 static inline unsigned int chan_to_field(unsigned int chan,
 899                                          struct fb_bitfield *bf)
 900 {
 901         chan &= 0xffff;
 902         chan >>= 16 - bf->length;
 903         return chan << bf->offset;
 904 }
 905
 906 /* sm501fb_setcolreg
 907  *
 908  * set the colour mapping for modes that support palettised data
 909 */
 910
 911 static int sm501fb_setcolreg(unsigned regno,
 912                              unsigned red, unsigned green, unsigned blue,
 913                              unsigned transp, struct fb_info *info)
 914 {
 915         struct sm501fb_par  *par = info->par;
 916         struct sm501fb_info *fbi = par->info;
 917         void __iomem *base = fbi->regs;
 918         unsigned int val;
 919
 920         if (par->head == HEAD_CRT)
 921                 base += SM501_DC_CRT_PALETTE;
 922         else
 923                 base += SM501_DC_PANEL_PALETTE;
 924
 925         switch (info->fix.visual) {
 926         case FB_VISUAL_TRUECOLOR:
 927                 /* true-colour, use pseuo-palette */
 928
 929                 if (regno < 16) {
 930                         u32 *pal = par->pseudo_palette;
 931
 932                         val  = chan_to_field(red,   &info->var.red);
 933                         val |= chan_to_field(green, &info->var.green);
 934                         val |= chan_to_field(blue,  &info->var.blue);
 935
 936                         pal[regno] = val;
 937                 }
 938                 break;
 939
 940         case FB_VISUAL_PSEUDOCOLOR:
 941                 if (regno < 256) {
 942                         val = (red >> 8) << 16;
 943                         val |= (green >> 8) << 8;
 944                         val |= blue >> 8;
 945
 946                         smc501_writel(val, base + (regno * 4));
 947                 }
 948
 949                 break;
 950
 951         default:
 952                 return 1;   /* unknown type */
 953         }
 954
 955         return 0;
 956 }
 957
 958 /* sm501fb_blank_pnl
 959  *
 960  * Blank or un-blank the panel interface
 961 */
 962
 963 static int sm501fb_blank_pnl(int blank_mode, struct fb_info *info)
 964 {
 965         struct sm501fb_par  *par = info->par;
 966         struct sm501fb_info *fbi = par->info;
 967
 968         dev_dbg(fbi->dev, "%s(mode=%d, %p)\n", __func__, blank_mode, info);
 969
 970         switch (blank_mode) {
 971         case FB_BLANK_POWERDOWN:
 972                 sm501fb_panel_power(fbi, 0);
 973                 break;
 974
 975         case FB_BLANK_UNBLANK:
 976                 sm501fb_panel_power(fbi, 1);
 977                 break;
 978
 979         case FB_BLANK_NORMAL:
 980         case FB_BLANK_VSYNC_SUSPEND:
 981         case FB_BLANK_HSYNC_SUSPEND:
 982         default:
 983                 return 1;
 984         }
 985
 986         return 0;
 987 }
 988
 989 /* sm501fb_blank_crt
 990  *
 991  * Blank or un-blank the crt interface
 992 */
 993
 994 static int sm501fb_blank_crt(int blank_mode, struct fb_info *info)
 995 {
 996         struct sm501fb_par  *par = info->par;
 997         struct sm501fb_info *fbi = par->info;
 998         unsigned long ctrl;
 999
1000         dev_dbg(fbi->dev, "%s(mode=%d, %p)\n", __func__, blank_mode, info);
1001
1002         ctrl = smc501_readl(fbi->regs + SM501_DC_CRT_CONTROL);
1003
1004         switch (blank_mode) {
1005         case FB_BLANK_POWERDOWN:
1006                 ctrl &= ~SM501_DC_CRT_CONTROL_ENABLE;
1007                 sm501_misc_control(fbi->dev->parent, SM501_MISC_DAC_POWER, 0);
1008                 fallthrough;
1009
1010         case FB_BLANK_NORMAL:
1011                 ctrl |= SM501_DC_CRT_CONTROL_BLANK;
1012                 break;
1013
1014         case FB_BLANK_UNBLANK:
1015                 ctrl &= ~SM501_DC_CRT_CONTROL_BLANK;
1016                 ctrl |=  SM501_DC_CRT_CONTROL_ENABLE;
1017                 sm501_misc_control(fbi->dev->parent, 0, SM501_MISC_DAC_POWER);
1018                 break;
1019
1020         case FB_BLANK_VSYNC_SUSPEND:
1021         case FB_BLANK_HSYNC_SUSPEND:
1022         default:
1023                 return 1;
1024
1025         }
1026
1027         smc501_writel(ctrl, fbi->regs + SM501_DC_CRT_CONTROL);
1028         sm501fb_sync_regs(fbi);
1029
1030         return 0;
1031 }
1032
1033 /* sm501fb_cursor
1034  *
1035  * set or change the hardware cursor parameters
1036 */
1037
1038 static int sm501fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
1039 {
1040         struct sm501fb_par  *par = info->par;
1041         struct sm501fb_info *fbi = par->info;
1042         void __iomem *base = fbi->regs;
1043         unsigned long hwc_addr;
1044         unsigned long fg, bg;
1045
1046         dev_dbg(fbi->dev, "%s(%p,%p)\n", __func__, info, cursor);
1047
1048         if (par->head == HEAD_CRT)
1049                 base += SM501_DC_CRT_HWC_BASE;
1050         else
1051                 base += SM501_DC_PANEL_HWC_BASE;
1052
1053         /* check not being asked to exceed capabilities */
1054
1055         if (cursor->image.width > 64)
1056                 return -EINVAL;
1057
1058         if (cursor->image.height > 64)
1059                 return -EINVAL;
1060
1061         if (cursor->image.depth > 1)
1062                 return -EINVAL;
1063
1064         hwc_addr = smc501_readl(base + SM501_OFF_HWC_ADDR);
1065
1066         if (cursor->enable)
1067                 smc501_writel(hwc_addr | SM501_HWC_EN,
1068                                 base + SM501_OFF_HWC_ADDR);
1069         else
1070                 smc501_writel(hwc_addr & ~SM501_HWC_EN,
1071                                 base + SM501_OFF_HWC_ADDR);
1072
1073         /* set data */
1074         if (cursor->set & FB_CUR_SETPOS) {
1075                 unsigned int x = cursor->image.dx;
1076                 unsigned int y = cursor->image.dy;
1077
1078                 if (x >= 2048 || y >= 2048 )
1079                         return -EINVAL;
1080
1081                 dev_dbg(fbi->dev, "set position %d,%d\n", x, y);
1082
1083                 //y += cursor->image.height;
1084
1085                 smc501_writel(x | (y << 16), base + SM501_OFF_HWC_LOC);
1086         }
1087
1088         if (cursor->set & FB_CUR_SETCMAP) {
1089                 unsigned int bg_col = cursor->image.bg_color;
1090                 unsigned int fg_col = cursor->image.fg_color;
1091
1092                 dev_dbg(fbi->dev, "%s: update cmap (%08x,%08x)\n",
1093                         __func__, bg_col, fg_col);
1094
1095                 bg = ((info->cmap.red[bg_col] & 0xF8) << 8) |
1096                         ((info->cmap.green[bg_col] & 0xFC) << 3) |
1097                         ((info->cmap.blue[bg_col] & 0xF8) >> 3);
1098
1099                 fg = ((info->cmap.red[fg_col] & 0xF8) << 8) |
1100                         ((info->cmap.green[fg_col] & 0xFC) << 3) |
1101                         ((info->cmap.blue[fg_col] & 0xF8) >> 3);
1102
1103                 dev_dbg(fbi->dev, "fgcol %08lx, bgcol %08lx\n", fg, bg);
1104
1105                 smc501_writel(bg, base + SM501_OFF_HWC_COLOR_1_2);
1106                 smc501_writel(fg, base + SM501_OFF_HWC_COLOR_3);
1107         }
1108
1109         if (cursor->set & FB_CUR_SETSIZE ||
1110             cursor->set & (FB_CUR_SETIMAGE | FB_CUR_SETSHAPE)) {
1111                 /* SM501 cursor is a two bpp 64x64 bitmap this routine
1112                  * clears it to transparent then combines the cursor
1113                  * shape plane with the colour plane to set the
1114                  * cursor */
1115                 int x, y;
1116                 const unsigned char *pcol = cursor->image.data;
1117                 const unsigned char *pmsk = cursor->mask;
1118                 void __iomem   *dst = par->cursor.k_addr;
1119                 unsigned char  dcol = 0;
1120                 unsigned char  dmsk = 0;
1121                 unsigned int   op;
1122
1123                 dev_dbg(fbi->dev, "%s: setting shape (%d,%d)\n",
1124                         __func__, cursor->image.width, cursor->image.height);
1125
1126                 for (op = 0; op < (64*64*2)/8; op+=4)
1127                         smc501_writel(0x0, dst + op);
1128
1129                 for (y = 0; y < cursor->image.height; y++) {
1130                         for (x = 0; x < cursor->image.width; x++) {
1131                                 if ((x % 8) == 0) {
1132                                         dcol = *pcol++;
1133                                         dmsk = *pmsk++;
1134                                 } else {
1135                                         dcol >>= 1;
1136                                         dmsk >>= 1;
1137                                 }
1138
1139                                 if (dmsk & 1) {
1140                                         op = (dcol & 1) ? 1 : 3;
1141                                         op <<= ((x % 4) * 2);
1142
1143                                         op |= readb(dst + (x / 4));
1144                                         writeb(op, dst + (x / 4));
1145                                 }
1146                         }
1147                         dst += (64*2)/8;
1148                 }
1149         }
1150
1151         sm501fb_sync_regs(fbi); /* ensure cursor data flushed */
1152         return 0;
1153 }
1154
1155 /* sm501fb_crtsrc_show
1156  *
1157  * device attribute code to show where the crt output is sourced from
1158 */
1159
1160 static ssize_t sm501fb_crtsrc_show(struct device *dev,
1161                                struct device_attribute *attr, char *buf)
1162 {
1163         struct sm501fb_info *info = dev_get_drvdata(dev);
1164         unsigned long ctrl;
1165
1166         ctrl = smc501_readl(info->regs + SM501_DC_CRT_CONTROL);
1167         ctrl &= SM501_DC_CRT_CONTROL_SEL;
1168
1169         return sysfs_emit(buf, "%s\n", ctrl ? "crt" : "panel");
1170 }
1171
1172 /* sm501fb_crtsrc_show
1173  *
1174  * device attribute code to set where the crt output is sourced from
1175 */
1176
1177 static ssize_t sm501fb_crtsrc_store(struct device *dev,
1178                                 struct device_attribute *attr,
1179                                 const char *buf, size_t len)
1180 {
1181         struct sm501fb_info *info = dev_get_drvdata(dev);
1182         enum sm501_controller head;
1183         unsigned long ctrl;
1184
1185         if (len < 1)
1186                 return -EINVAL;
1187
1188         if (strncasecmp(buf, "crt", 3) == 0)
1189                 head = HEAD_CRT;
1190         else if (strncasecmp(buf, "panel", 5) == 0)
1191                 head = HEAD_PANEL;
1192         else
1193                 return -EINVAL;
1194
1195         dev_info(dev, "setting crt source to head %d\n", head);
1196
1197         ctrl = smc501_readl(info->regs + SM501_DC_CRT_CONTROL);
1198
1199         if (head == HEAD_CRT) {
1200                 ctrl |= SM501_DC_CRT_CONTROL_SEL;
1201                 ctrl |= SM501_DC_CRT_CONTROL_ENABLE;
1202                 ctrl |= SM501_DC_CRT_CONTROL_TE;
1203         } else {
1204                 ctrl &= ~SM501_DC_CRT_CONTROL_SEL;
1205                 ctrl &= ~SM501_DC_CRT_CONTROL_ENABLE;
1206                 ctrl &= ~SM501_DC_CRT_CONTROL_TE;
1207         }
1208
1209         smc501_writel(ctrl, info->regs + SM501_DC_CRT_CONTROL);
1210         sm501fb_sync_regs(info);
1211
1212         return len;
1213 }
1214
1215 /* Prepare the device_attr for registration with sysfs later */
1216 static DEVICE_ATTR(crt_src, 0664, sm501fb_crtsrc_show, sm501fb_crtsrc_store);
1217
1218 /* sm501fb_show_regs
1219  *
1220  * show the primary sm501 registers
1221 */
1222 static int sm501fb_show_regs(struct sm501fb_info *info, char *ptr,
1223                              unsigned int start, unsigned int len)
1224 {
1225         void __iomem *mem = info->regs;
1226         char *buf = ptr;
1227         unsigned int reg;
1228
1229         for (reg = start; reg < (len + start); reg += 4)
1230                 ptr += sprintf(ptr, "%08x = %08x\n", reg,
1231                                 smc501_readl(mem + reg));
1232
1233         return ptr - buf;
1234 }
1235
1236 /* sm501fb_debug_show_crt
1237  *
1238  * show the crt control and cursor registers
1239 */
1240
1241 static ssize_t sm501fb_debug_show_crt(struct device *dev,
1242                                   struct device_attribute *attr, char *buf)
1243 {
1244         struct sm501fb_info *info = dev_get_drvdata(dev);
1245         char *ptr = buf;
1246
1247         ptr += sm501fb_show_regs(info, ptr, SM501_DC_CRT_CONTROL, 0x40);
1248         ptr += sm501fb_show_regs(info, ptr, SM501_DC_CRT_HWC_BASE, 0x10);
1249
1250         return ptr - buf;
1251 }
1252
1253 static DEVICE_ATTR(fbregs_crt, 0444, sm501fb_debug_show_crt, NULL);
1254
1255 /* sm501fb_debug_show_pnl
1256  *
1257  * show the panel control and cursor registers
1258 */
1259
1260 static ssize_t sm501fb_debug_show_pnl(struct device *dev,
1261                                   struct device_attribute *attr, char *buf)
1262 {
1263         struct sm501fb_info *info = dev_get_drvdata(dev);
1264         char *ptr = buf;
1265
1266         ptr += sm501fb_show_regs(info, ptr, 0x0, 0x40);
1267         ptr += sm501fb_show_regs(info, ptr, SM501_DC_PANEL_HWC_BASE, 0x10);
1268
1269         return ptr - buf;
1270 }
1271
1272 static DEVICE_ATTR(fbregs_pnl, 0444, sm501fb_debug_show_pnl, NULL);
1273
1274 static struct attribute *sm501fb_attrs[] = {
1275         &dev_attr_crt_src.attr,
1276         &dev_attr_fbregs_pnl.attr,
1277         &dev_attr_fbregs_crt.attr,
1278         NULL,
1279 };
1280 ATTRIBUTE_GROUPS(sm501fb);
1281
1282 /* acceleration operations */
1283 static int sm501fb_sync(struct fb_info *info)
1284 {
1285         int count = 1000000;
1286         struct sm501fb_par  *par = info->par;
1287         struct sm501fb_info *fbi = par->info;
1288
1289         /* wait for the 2d engine to be ready */
1290         while ((count > 0) &&
1291                (smc501_readl(fbi->regs + SM501_SYSTEM_CONTROL) &
1292                 SM501_SYSCTRL_2D_ENGINE_STATUS) != 0)
1293                 count--;
1294
1295         if (count <= 0) {
1296                 fb_err(info, "Timeout waiting for 2d engine sync\n");
1297                 return 1;
1298         }
1299         return 0;
1300 }
1301
1302 static void sm501fb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
1303 {
1304         struct sm501fb_par  *par = info->par;
1305         struct sm501fb_info *fbi = par->info;
1306         int width = area->width;
1307         int height = area->height;
1308         int sx = area->sx;
1309         int sy = area->sy;
1310         int dx = area->dx;
1311         int dy = area->dy;
1312         unsigned long rtl = 0;
1313
1314         /* source clip */
1315         if ((sx >= info->var.xres_virtual) ||
1316             (sy >= info->var.yres_virtual))
1317                 /* source Area not within virtual screen, skipping */
1318                 return;
1319         if ((sx + width) >= info->var.xres_virtual)
1320                 width = info->var.xres_virtual - sx - 1;
1321         if ((sy + height) >= info->var.yres_virtual)
1322                 height = info->var.yres_virtual - sy - 1;
1323
1324         /* dest clip */
1325         if ((dx >= info->var.xres_virtual) ||
1326             (dy >= info->var.yres_virtual))
1327                 /* Destination Area not within virtual screen, skipping */
1328                 return;
1329         if ((dx + width) >= info->var.xres_virtual)
1330                 width = info->var.xres_virtual - dx - 1;
1331         if ((dy + height) >= info->var.yres_virtual)
1332                 height = info->var.yres_virtual - dy - 1;
1333
1334         if ((sx < dx) || (sy < dy)) {
1335                 rtl = 1 << 27;
1336                 sx += width - 1;
1337                 dx += width - 1;
1338                 sy += height - 1;
1339                 dy += height - 1;
1340         }
1341
1342         if (sm501fb_sync(info))
1343                 return;
1344
1345         /* set the base addresses */
1346         smc501_writel(par->screen.sm_addr, fbi->regs2d + SM501_2D_SOURCE_BASE);
1347         smc501_writel(par->screen.sm_addr,
1348                         fbi->regs2d + SM501_2D_DESTINATION_BASE);
1349
1350         /* set the window width */
1351         smc501_writel((info->var.xres << 16) | info->var.xres,
1352                fbi->regs2d + SM501_2D_WINDOW_WIDTH);
1353
1354         /* set window stride */
1355         smc501_writel((info->var.xres_virtual << 16) | info->var.xres_virtual,
1356                fbi->regs2d + SM501_2D_PITCH);
1357
1358         /* set data format */
1359         switch (info->var.bits_per_pixel) {
1360         case 8:
1361                 smc501_writel(0, fbi->regs2d + SM501_2D_STRETCH);
1362                 break;
1363         case 16:
1364                 smc501_writel(0x00100000, fbi->regs2d + SM501_2D_STRETCH);
1365                 break;
1366         case 32:
1367                 smc501_writel(0x00200000, fbi->regs2d + SM501_2D_STRETCH);
1368                 break;
1369         }
1370
1371         /* 2d compare mask */
1372         smc501_writel(0xffffffff, fbi->regs2d + SM501_2D_COLOR_COMPARE_MASK);
1373
1374         /* 2d mask */
1375         smc501_writel(0xffffffff, fbi->regs2d + SM501_2D_MASK);
1376
1377         /* source and destination x y */
1378         smc501_writel((sx << 16) | sy, fbi->regs2d + SM501_2D_SOURCE);
1379         smc501_writel((dx << 16) | dy, fbi->regs2d + SM501_2D_DESTINATION);
1380
1381         /* w/h */
1382         smc501_writel((width << 16) | height, fbi->regs2d + SM501_2D_DIMENSION);
1383
1384         /* do area move */
1385         smc501_writel(0x800000cc | rtl, fbi->regs2d + SM501_2D_CONTROL);
1386 }
1387
1388 static void sm501fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
1389 {
1390         struct sm501fb_par  *par = info->par;
1391         struct sm501fb_info *fbi = par->info;
1392         int width = rect->width, height = rect->height;
1393
1394         if ((rect->dx >= info->var.xres_virtual) ||
1395             (rect->dy >= info->var.yres_virtual))
1396                 /* Rectangle not within virtual screen, skipping */
1397                 return;
1398         if ((rect->dx + width) >= info->var.xres_virtual)
1399                 width = info->var.xres_virtual - rect->dx - 1;
1400         if ((rect->dy + height) >= info->var.yres_virtual)
1401                 height = info->var.yres_virtual - rect->dy - 1;
1402
1403         if (sm501fb_sync(info))
1404                 return;
1405
1406         /* set the base addresses */
1407         smc501_writel(par->screen.sm_addr, fbi->regs2d + SM501_2D_SOURCE_BASE);
1408         smc501_writel(par->screen.sm_addr,
1409                         fbi->regs2d + SM501_2D_DESTINATION_BASE);
1410
1411         /* set the window width */
1412         smc501_writel((info->var.xres << 16) | info->var.xres,
1413                fbi->regs2d + SM501_2D_WINDOW_WIDTH);
1414
1415         /* set window stride */
1416         smc501_writel((info->var.xres_virtual << 16) | info->var.xres_virtual,
1417                fbi->regs2d + SM501_2D_PITCH);
1418
1419         /* set data format */
1420         switch (info->var.bits_per_pixel) {
1421         case 8:
1422                 smc501_writel(0, fbi->regs2d + SM501_2D_STRETCH);
1423                 break;
1424         case 16:
1425                 smc501_writel(0x00100000, fbi->regs2d + SM501_2D_STRETCH);
1426                 break;
1427         case 32:
1428                 smc501_writel(0x00200000, fbi->regs2d + SM501_2D_STRETCH);
1429                 break;
1430         }
1431
1432         /* 2d compare mask */
1433         smc501_writel(0xffffffff, fbi->regs2d + SM501_2D_COLOR_COMPARE_MASK);
1434
1435         /* 2d mask */
1436         smc501_writel(0xffffffff, fbi->regs2d + SM501_2D_MASK);
1437
1438         /* colour */
1439         smc501_writel(rect->color, fbi->regs2d + SM501_2D_FOREGROUND);
1440
1441         /* x y */
1442         smc501_writel((rect->dx << 16) | rect->dy,
1443                         fbi->regs2d + SM501_2D_DESTINATION);
1444
1445         /* w/h */
1446         smc501_writel((width << 16) | height, fbi->regs2d + SM501_2D_DIMENSION);
1447
1448         /* do rectangle fill */
1449         smc501_writel(0x800100cc, fbi->regs2d + SM501_2D_CONTROL);
1450 }
1451
1452
1453 static struct fb_ops sm501fb_ops_crt = {
1454         .owner          = THIS_MODULE,
1455         __FB_DEFAULT_IOMEM_OPS_RDWR,
1456         .fb_check_var   = sm501fb_check_var_crt,
1457         .fb_set_par     = sm501fb_set_par_crt,
1458         .fb_blank       = sm501fb_blank_crt,
1459         .fb_setcolreg   = sm501fb_setcolreg,
1460         .fb_pan_display = sm501fb_pan_crt,
1461         .fb_cursor      = sm501fb_cursor,
1462         .fb_fillrect    = sm501fb_fillrect,
1463         .fb_copyarea    = sm501fb_copyarea,
1464         .fb_imageblit   = cfb_imageblit,
1465         .fb_sync        = sm501fb_sync,
1466         __FB_DEFAULT_IOMEM_OPS_MMAP,
1467 };
1468
1469 static struct fb_ops sm501fb_ops_pnl = {
1470         .owner          = THIS_MODULE,
1471         __FB_DEFAULT_IOMEM_OPS_RDWR,
1472         .fb_check_var   = sm501fb_check_var_pnl,
1473         .fb_set_par     = sm501fb_set_par_pnl,
1474         .fb_pan_display = sm501fb_pan_pnl,
1475         .fb_blank       = sm501fb_blank_pnl,
1476         .fb_setcolreg   = sm501fb_setcolreg,
1477         .fb_cursor      = sm501fb_cursor,
1478         .fb_fillrect    = sm501fb_fillrect,
1479         .fb_copyarea    = sm501fb_copyarea,
1480         .fb_imageblit   = cfb_imageblit,
1481         .fb_sync        = sm501fb_sync,
1482         __FB_DEFAULT_IOMEM_OPS_MMAP,
1483 };
1484
1485 /* sm501_init_cursor
1486  *
1487  * initialise hw cursor parameters
1488 */
1489
1490 static int sm501_init_cursor(struct fb_info *fbi, unsigned int reg_base)
1491 {
1492         struct sm501fb_par *par;
1493         struct sm501fb_info *info;
1494         int ret;
1495
1496         if (fbi == NULL)
1497                 return 0;
1498
1499         par = fbi->par;
1500         info = par->info;
1501
1502         par->cursor_regs = info->regs + reg_base;
1503
1504         ret = sm501_alloc_mem(info, &par->cursor, SM501_MEMF_CURSOR, 1024,
1505                               fbi->fix.smem_len);
1506         if (ret < 0)
1507                 return ret;
1508
1509         /* initialise the colour registers */
1510
1511         smc501_writel(par->cursor.sm_addr,
1512                         par->cursor_regs + SM501_OFF_HWC_ADDR);
1513
1514         smc501_writel(0x00, par->cursor_regs + SM501_OFF_HWC_LOC);
1515         smc501_writel(0x00, par->cursor_regs + SM501_OFF_HWC_COLOR_1_2);
1516         smc501_writel(0x00, par->cursor_regs + SM501_OFF_HWC_COLOR_3);
1517         sm501fb_sync_regs(info);
1518
1519         return 0;
1520 }
1521
1522 /* sm501fb_info_start
1523  *
1524  * fills the par structure claiming resources and remapping etc.
1525 */
1526
1527 static int sm501fb_start(struct sm501fb_info *info,
1528                          struct platform_device *pdev)
1529 {
1530         struct resource *res;
1531         struct device *dev = &pdev->dev;
1532         int k;
1533         int ret;
1534
1535         info->irq = ret = platform_get_irq(pdev, 0);
1536         if (ret < 0) {
1537                 /* we currently do not use the IRQ */
1538                 dev_warn(dev, "no irq for device\n");
1539         }
1540
1541         /* allocate, reserve and remap resources for display
1542          * controller registers */
1543         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1544         if (res == NULL) {
1545                 dev_err(dev, "no resource definition for registers\n");
1546                 ret = -ENOENT;
1547                 goto err_release;
1548         }
1549
1550         info->regs_res = request_mem_region(res->start,
1551                                             resource_size(res),
1552                                             pdev->name);
1553
1554         if (info->regs_res == NULL) {
1555                 dev_err(dev, "cannot claim registers\n");
1556                 ret = -ENXIO;
1557                 goto err_release;
1558         }
1559
1560         info->regs = ioremap(res->start, resource_size(res));
1561         if (info->regs == NULL) {
1562                 dev_err(dev, "cannot remap registers\n");
1563                 ret = -ENXIO;
1564                 goto err_regs_res;
1565         }
1566
1567         /* allocate, reserve and remap resources for 2d
1568          * controller registers */
1569         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1570         if (res == NULL) {
1571                 dev_err(dev, "no resource definition for 2d registers\n");
1572                 ret = -ENOENT;
1573                 goto err_regs_map;
1574         }
1575
1576         info->regs2d_res = request_mem_region(res->start,
1577                                               resource_size(res),
1578                                               pdev->name);
1579
1580         if (info->regs2d_res == NULL) {
1581                 dev_err(dev, "cannot claim registers\n");
1582                 ret = -ENXIO;
1583                 goto err_regs_map;
1584         }
1585
1586         info->regs2d = ioremap(res->start, resource_size(res));
1587         if (info->regs2d == NULL) {
1588                 dev_err(dev, "cannot remap registers\n");
1589                 ret = -ENXIO;
1590                 goto err_regs2d_res;
1591         }
1592
1593         /* allocate, reserve resources for framebuffer */
1594         res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
1595         if (res == NULL) {
1596                 dev_err(dev, "no memory resource defined\n");
1597                 ret = -ENXIO;
1598                 goto err_regs2d_map;
1599         }
1600
1601         info->fbmem_res = request_mem_region(res->start,
1602                                              resource_size(res),
1603                                              pdev->name);
1604         if (info->fbmem_res == NULL) {
1605                 dev_err(dev, "cannot claim framebuffer\n");
1606                 ret = -ENXIO;
1607                 goto err_regs2d_map;
1608         }
1609
1610         info->fbmem = ioremap(res->start, resource_size(res));
1611         if (info->fbmem == NULL) {
1612                 dev_err(dev, "cannot remap framebuffer\n");
1613                 ret = -ENXIO;
1614                 goto err_mem_res;
1615         }
1616
1617         info->fbmem_len = resource_size(res);
1618
1619         /* clear framebuffer memory - avoids garbage data on unused fb */
1620         memset_io(info->fbmem, 0, info->fbmem_len);
1621
1622         /* clear palette ram - undefined at power on */
1623         for (k = 0; k < (256 * 3); k++)
1624                 smc501_writel(0, info->regs + SM501_DC_PANEL_PALETTE + (k * 4));
1625
1626         /* enable display controller */
1627         sm501_unit_power(dev->parent, SM501_GATE_DISPLAY, 1);
1628
1629         /* enable 2d controller */
1630         sm501_unit_power(dev->parent, SM501_GATE_2D_ENGINE, 1);
1631
1632         /* setup cursors */
1633         sm501_init_cursor(info->fb[HEAD_CRT], SM501_DC_CRT_HWC_ADDR);
1634         sm501_init_cursor(info->fb[HEAD_PANEL], SM501_DC_PANEL_HWC_ADDR);
1635
1636         return 0; /* everything is setup */
1637
1638  err_mem_res:
1639         release_mem_region(info->fbmem_res->start,
1640                            resource_size(info->fbmem_res));
1641
1642  err_regs2d_map:
1643         iounmap(info->regs2d);
1644
1645  err_regs2d_res:
1646         release_mem_region(info->regs2d_res->start,
1647                            resource_size(info->regs2d_res));
1648
1649  err_regs_map:
1650         iounmap(info->regs);
1651
1652  err_regs_res:
1653         release_mem_region(info->regs_res->start,
1654                            resource_size(info->regs_res));
1655
1656  err_release:
1657         return ret;
1658 }
1659
1660 static void sm501fb_stop(struct sm501fb_info *info)
1661 {
1662         /* disable display controller */
1663         sm501_unit_power(info->dev->parent, SM501_GATE_DISPLAY, 0);
1664
1665         iounmap(info->fbmem);
1666         release_mem_region(info->fbmem_res->start,
1667                            resource_size(info->fbmem_res));
1668
1669         iounmap(info->regs2d);
1670         release_mem_region(info->regs2d_res->start,
1671                            resource_size(info->regs2d_res));
1672
1673         iounmap(info->regs);
1674         release_mem_region(info->regs_res->start,
1675                            resource_size(info->regs_res));
1676 }
1677
1678 static int sm501fb_init_fb(struct fb_info *fb, enum sm501_controller head,
1679                            const char *fbname)
1680 {
1681         struct sm501_platdata_fbsub *pd;
1682         struct sm501fb_par *par = fb->par;
1683         struct sm501fb_info *info = par->info;
1684         unsigned long ctrl;
1685         unsigned int enable;
1686         int ret;
1687
1688         switch (head) {
1689         case HEAD_CRT:
1690                 pd = info->pdata->fb_crt;
1691                 ctrl = smc501_readl(info->regs + SM501_DC_CRT_CONTROL);
1692                 enable = (ctrl & SM501_DC_CRT_CONTROL_ENABLE) ? 1 : 0;
1693
1694                 /* ensure we set the correct source register */
1695                 if (info->pdata->fb_route != SM501_FB_CRT_PANEL) {
1696                         ctrl |= SM501_DC_CRT_CONTROL_SEL;
1697                         smc501_writel(ctrl, info->regs + SM501_DC_CRT_CONTROL);
1698                 }
1699
1700                 break;
1701
1702         case HEAD_PANEL:
1703                 pd = info->pdata->fb_pnl;
1704                 ctrl = smc501_readl(info->regs + SM501_DC_PANEL_CONTROL);
1705                 enable = (ctrl & SM501_DC_PANEL_CONTROL_EN) ? 1 : 0;
1706                 break;
1707
1708         default:
1709                 pd = NULL;              /* stop compiler warnings */
1710                 ctrl = 0;
1711                 enable = 0;
1712                 BUG();
1713         }
1714
1715         dev_info(info->dev, "fb %s %sabled at start\n",
1716                  fbname, enable ? "en" : "dis");
1717
1718         /* check to see if our routing allows this */
1719
1720         if (head == HEAD_CRT && info->pdata->fb_route == SM501_FB_CRT_PANEL) {
1721                 ctrl &= ~SM501_DC_CRT_CONTROL_SEL;
1722                 smc501_writel(ctrl, info->regs + SM501_DC_CRT_CONTROL);
1723                 enable = 0;
1724         }
1725
1726         strscpy(fb->fix.id, fbname, sizeof(fb->fix.id));
1727
1728         memcpy(&par->ops,
1729                (head == HEAD_CRT) ? &sm501fb_ops_crt : &sm501fb_ops_pnl,
1730                sizeof(struct fb_ops));
1731
1732         /* update ops dependent on what we've been passed */
1733
1734         if ((pd->flags & SM501FB_FLAG_USE_HWCURSOR) == 0)
1735                 par->ops.fb_cursor = NULL;
1736
1737         fb->fbops = &par->ops;
1738         fb->flags = FBINFO_READS_FAST |
1739                 FBINFO_HWACCEL_COPYAREA | FBINFO_HWACCEL_FILLRECT |
1740                 FBINFO_HWACCEL_XPAN | FBINFO_HWACCEL_YPAN;
1741
1742 #if defined(CONFIG_OF)
1743 #ifdef __BIG_ENDIAN
1744         if (of_property_read_bool(info->dev->parent->of_node, "little-endian"))
1745                 fb->flags |= FBINFO_FOREIGN_ENDIAN;
1746 #else
1747         if (of_property_read_bool(info->dev->parent->of_node, "big-endian"))
1748                 fb->flags |= FBINFO_FOREIGN_ENDIAN;
1749 #endif
1750 #endif
1751         /* fixed data */
1752
1753         fb->fix.type            = FB_TYPE_PACKED_PIXELS;
1754         fb->fix.type_aux        = 0;
1755         fb->fix.xpanstep        = 1;
1756         fb->fix.ypanstep        = 1;
1757         fb->fix.ywrapstep       = 0;
1758         fb->fix.accel           = FB_ACCEL_NONE;
1759
1760         /* screenmode */
1761
1762         fb->var.nonstd          = 0;
1763         fb->var.activate        = FB_ACTIVATE_NOW;
1764         fb->var.accel_flags     = 0;
1765         fb->var.vmode           = FB_VMODE_NONINTERLACED;
1766         fb->var.bits_per_pixel  = 16;
1767
1768         if (info->edid_data) {
1769                         /* Now build modedb from EDID */
1770                         fb_edid_to_monspecs(info->edid_data, &fb->monspecs);
1771                         fb_videomode_to_modelist(fb->monspecs.modedb,
1772                                                  fb->monspecs.modedb_len,
1773                                                  &fb->modelist);
1774         }
1775
1776         if (enable && (pd->flags & SM501FB_FLAG_USE_INIT_MODE) && 0) {
1777                 /* TODO read the mode from the current display */
1778         } else {
1779                 if (pd->def_mode) {
1780                         dev_info(info->dev, "using supplied mode\n");
1781                         fb_videomode_to_var(&fb->var, pd->def_mode);
1782
1783                         fb->var.bits_per_pixel = pd->def_bpp ? pd->def_bpp : 8;
1784                         fb->var.xres_virtual = fb->var.xres;
1785                         fb->var.yres_virtual = fb->var.yres;
1786                 } else {
1787                         if (info->edid_data) {
1788                                 ret = fb_find_mode(&fb->var, fb, fb_mode,
1789                                         fb->monspecs.modedb,
1790                                         fb->monspecs.modedb_len,
1791                                         &sm501_default_mode, default_bpp);
1792                                 /* edid_data is no longer needed, free it */
1793                                 kfree(info->edid_data);
1794                         } else {
1795                                 ret = fb_find_mode(&fb->var, fb,
1796                                            NULL, NULL, 0, NULL, 8);
1797                         }
1798
1799                         switch (ret) {
1800                         case 1:
1801                                 dev_info(info->dev, "using mode specified in "
1802                                                 "@mode\n");
1803                                 break;
1804                         case 2:
1805                                 dev_info(info->dev, "using mode specified in "
1806                                         "@mode with ignored refresh rate\n");
1807                                 break;
1808                         case 3:
1809                                 dev_info(info->dev, "using mode default "
1810                                         "mode\n");
1811                                 break;
1812                         case 4:
1813                                 dev_info(info->dev, "using mode from list\n");
1814                                 break;
1815                         default:
1816                                 dev_info(info->dev, "ret = %d\n", ret);
1817                                 dev_info(info->dev, "failed to find mode\n");
1818                                 return -EINVAL;
1819                         }
1820                 }
1821         }
1822
1823         /* initialise and set the palette */
1824         if (fb_alloc_cmap(&fb->cmap, NR_PALETTE, 0)) {
1825                 dev_err(info->dev, "failed to allocate cmap memory\n");
1826                 return -ENOMEM;
1827         }
1828         fb_set_cmap(&fb->cmap, fb);
1829
1830         ret = (fb->fbops->fb_check_var)(&fb->var, fb);
1831         if (ret)
1832                 dev_err(info->dev, "check_var() failed on initial setup?\n");
1833
1834         return 0;
1835 }
1836
1837 /* default platform data if none is supplied (ie, PCI device) */
1838
1839 static struct sm501_platdata_fbsub sm501fb_pdata_crt = {
1840         .flags          = (SM501FB_FLAG_USE_INIT_MODE |
1841                            SM501FB_FLAG_USE_HWCURSOR |
1842                            SM501FB_FLAG_USE_HWACCEL |
1843                            SM501FB_FLAG_DISABLE_AT_EXIT),
1844
1845 };
1846
1847 static struct sm501_platdata_fbsub sm501fb_pdata_pnl = {
1848         .flags          = (SM501FB_FLAG_USE_INIT_MODE |
1849                            SM501FB_FLAG_USE_HWCURSOR |
1850                            SM501FB_FLAG_USE_HWACCEL |
1851                            SM501FB_FLAG_DISABLE_AT_EXIT),
1852 };
1853
1854 static struct sm501_platdata_fb sm501fb_def_pdata = {
1855         .fb_route               = SM501_FB_OWN,
1856         .fb_crt                 = &sm501fb_pdata_crt,
1857         .fb_pnl                 = &sm501fb_pdata_pnl,
1858 };
1859
1860 static char driver_name_crt[] = "sm501fb-crt";
1861 static char driver_name_pnl[] = "sm501fb-panel";
1862
1863 static int sm501fb_probe_one(struct sm501fb_info *info,
1864                              enum sm501_controller head)
1865 {
1866         unsigned char *name = (head == HEAD_CRT) ? "crt" : "panel";
1867         struct sm501_platdata_fbsub *pd;
1868         struct sm501fb_par *par;
1869         struct fb_info *fbi;
1870
1871         pd = (head == HEAD_CRT) ? info->pdata->fb_crt : info->pdata->fb_pnl;
1872
1873         /* Do not initialise if we've not been given any platform data */
1874         if (pd == NULL) {
1875                 dev_info(info->dev, "no data for fb %s (disabled)\n", name);
1876                 return 0;
1877         }
1878
1879         fbi = framebuffer_alloc(sizeof(struct sm501fb_par), info->dev);
1880         if (!fbi)
1881                 return -ENOMEM;
1882
1883         par = fbi->par;
1884         par->info = info;
1885         par->head = head;
1886         fbi->pseudo_palette = &par->pseudo_palette;
1887
1888         info->fb[head] = fbi;
1889
1890         return 0;
1891 }
1892
1893 /* Free up anything allocated by sm501fb_init_fb */
1894
1895 static void sm501_free_init_fb(struct sm501fb_info *info,
1896                                 enum sm501_controller head)
1897 {
1898         struct fb_info *fbi = info->fb[head];
1899
1900         if (!fbi)
1901                 return;
1902
1903         fb_dealloc_cmap(&fbi->cmap);
1904 }
1905
1906 static int sm501fb_start_one(struct sm501fb_info *info,
1907                              enum sm501_controller head, const char *drvname)
1908 {
1909         struct fb_info *fbi = info->fb[head];
1910         int ret;
1911
1912         if (!fbi)
1913                 return 0;
1914
1915         mutex_init(&info->fb[head]->mm_lock);
1916
1917         ret = sm501fb_init_fb(info->fb[head], head, drvname);
1918         if (ret) {
1919                 dev_err(info->dev, "cannot initialise fb %s\n", drvname);
1920                 return ret;
1921         }
1922
1923         ret = register_framebuffer(info->fb[head]);
1924         if (ret) {
1925                 dev_err(info->dev, "failed to register fb %s\n", drvname);
1926                 sm501_free_init_fb(info, head);
1927                 return ret;
1928         }
1929
1930         dev_info(info->dev, "fb%d: %s frame buffer\n", fbi->node, fbi->fix.id);
1931
1932         return 0;
1933 }
1934
1935 static int sm501fb_probe(struct platform_device *pdev)
1936 {
1937         struct sm501fb_info *info;
1938         struct device *dev = &pdev->dev;
1939         int ret;
1940
1941         /* allocate our framebuffers */
1942         info = kzalloc(sizeof(*info), GFP_KERNEL);
1943         if (!info) {
1944                 dev_err(dev, "failed to allocate state\n");
1945                 return -ENOMEM;
1946         }
1947
1948         info->dev = dev = &pdev->dev;
1949         platform_set_drvdata(pdev, info);
1950
1951         if (dev->parent->platform_data) {
1952                 struct sm501_platdata *pd = dev->parent->platform_data;
1953                 info->pdata = pd->fb;
1954         }
1955
1956         if (info->pdata == NULL) {
1957                 int found = 0;
1958 #if defined(CONFIG_OF)
1959                 struct device_node *np = pdev->dev.parent->of_node;
1960                 const u8 *prop;
1961                 const char *cp;
1962                 int len;
1963
1964                 info->pdata = &sm501fb_def_pdata;
1965                 if (np) {
1966                         /* Get EDID */
1967                         cp = of_get_property(np, "mode", &len);
1968                         if (cp)
1969                                 strcpy(fb_mode, cp);
1970                         prop = of_get_property(np, "edid", &len);
1971                         if (prop && len == EDID_LENGTH) {
1972                                 info->edid_data = kmemdup(prop, EDID_LENGTH,
1973                                                           GFP_KERNEL);
1974                                 if (info->edid_data)
1975                                         found = 1;
1976                         }
1977                 }
1978 #endif
1979                 if (!found) {
1980                         dev_info(dev, "using default configuration data\n");
1981                         info->pdata = &sm501fb_def_pdata;
1982                 }
1983         }
1984
1985         /* probe for the presence of each panel */
1986
1987         ret = sm501fb_probe_one(info, HEAD_CRT);
1988         if (ret < 0) {
1989                 dev_err(dev, "failed to probe CRT\n");
1990                 goto err_alloc;
1991         }
1992
1993         ret = sm501fb_probe_one(info, HEAD_PANEL);
1994         if (ret < 0) {
1995                 dev_err(dev, "failed to probe PANEL\n");
1996                 goto err_probed_crt;
1997         }
1998
1999         if (info->fb[HEAD_PANEL] == NULL &&
2000             info->fb[HEAD_CRT] == NULL) {
2001                 dev_err(dev, "no framebuffers found\n");
2002                 ret = -ENODEV;
2003                 goto err_alloc;
2004         }
2005
2006         /* get the resources for both of the framebuffers */
2007
2008         ret = sm501fb_start(info, pdev);
2009         if (ret) {
2010                 dev_err(dev, "cannot initialise SM501\n");
2011                 goto err_probed_panel;
2012         }
2013
2014         ret = sm501fb_start_one(info, HEAD_CRT, driver_name_crt);
2015         if (ret) {
2016                 dev_err(dev, "failed to start CRT\n");
2017                 goto err_started;
2018         }
2019
2020         ret = sm501fb_start_one(info, HEAD_PANEL, driver_name_pnl);
2021         if (ret) {
2022                 dev_err(dev, "failed to start Panel\n");
2023                 goto err_started_crt;
2024         }
2025
2026         /* we registered, return ok */
2027         return 0;
2028
2029 err_started_crt:
2030         unregister_framebuffer(info->fb[HEAD_CRT]);
2031         sm501_free_init_fb(info, HEAD_CRT);
2032
2033 err_started:
2034         sm501fb_stop(info);
2035
2036 err_probed_panel:
2037         framebuffer_release(info->fb[HEAD_PANEL]);
2038
2039 err_probed_crt:
2040         framebuffer_release(info->fb[HEAD_CRT]);
2041
2042 err_alloc:
2043         kfree(info);
2044
2045         return ret;
2046 }
2047
2048
2049 /*
2050  *  Cleanup
2051  */
2052 static void sm501fb_remove(struct platform_device *pdev)
2053 {
2054         struct sm501fb_info *info = platform_get_drvdata(pdev);
2055         struct fb_info     *fbinfo_crt = info->fb[0];
2056         struct fb_info     *fbinfo_pnl = info->fb[1];
2057
2058         sm501_free_init_fb(info, HEAD_CRT);
2059         sm501_free_init_fb(info, HEAD_PANEL);
2060
2061         if (fbinfo_crt)
2062                 unregister_framebuffer(fbinfo_crt);
2063         if (fbinfo_pnl)
2064                 unregister_framebuffer(fbinfo_pnl);
2065
2066         sm501fb_stop(info);
2067         kfree(info);
2068
2069         framebuffer_release(fbinfo_pnl);
2070         framebuffer_release(fbinfo_crt);
2071 }
2072
2073 #ifdef CONFIG_PM
2074
2075 static int sm501fb_suspend_fb(struct sm501fb_info *info,
2076                               enum sm501_controller head)
2077 {
2078         struct fb_info *fbi = info->fb[head];
2079         struct sm501fb_par *par;
2080
2081         if (!fbi)
2082                 return 0;
2083
2084         par = fbi->par;
2085         if (par->screen.size == 0)
2086                 return 0;
2087
2088         /* blank the relevant interface to ensure unit power minimised */
2089         (par->ops.fb_blank)(FB_BLANK_POWERDOWN, fbi);
2090
2091         /* tell console/fb driver we are suspending */
2092
2093         console_lock();
2094         fb_set_suspend(fbi, 1);
2095         console_unlock();
2096
2097         /* backup copies in case chip is powered down over suspend */
2098
2099         par->store_fb = vmalloc(par->screen.size);
2100         if (par->store_fb == NULL) {
2101                 dev_err(info->dev, "no memory to store screen\n");
2102                 return -ENOMEM;
2103         }
2104
2105         par->store_cursor = vmalloc(par->cursor.size);
2106         if (par->store_cursor == NULL) {
2107                 dev_err(info->dev, "no memory to store cursor\n");
2108                 goto err_nocursor;
2109         }
2110
2111         dev_dbg(info->dev, "suspending screen to %p\n", par->store_fb);
2112         dev_dbg(info->dev, "suspending cursor to %p\n", par->store_cursor);
2113
2114         memcpy_fromio(par->store_fb, par->screen.k_addr, par->screen.size);
2115         memcpy_fromio(par->store_cursor, par->cursor.k_addr, par->cursor.size);
2116
2117         return 0;
2118
2119  err_nocursor:
2120         vfree(par->store_fb);
2121         par->store_fb = NULL;
2122
2123         return -ENOMEM;
2124 }
2125
2126 static void sm501fb_resume_fb(struct sm501fb_info *info,
2127                               enum sm501_controller head)
2128 {
2129         struct fb_info *fbi = info->fb[head];
2130         struct sm501fb_par *par;
2131
2132         if (!fbi)
2133                 return;
2134
2135         par = fbi->par;
2136         if (par->screen.size == 0)
2137                 return;
2138
2139         /* re-activate the configuration */
2140
2141         (par->ops.fb_set_par)(fbi);
2142
2143         /* restore the data */
2144
2145         dev_dbg(info->dev, "restoring screen from %p\n", par->store_fb);
2146         dev_dbg(info->dev, "restoring cursor from %p\n", par->store_cursor);
2147
2148         if (par->store_fb)
2149                 memcpy_toio(par->screen.k_addr, par->store_fb,
2150                             par->screen.size);
2151
2152         if (par->store_cursor)
2153                 memcpy_toio(par->cursor.k_addr, par->store_cursor,
2154                             par->cursor.size);
2155
2156         console_lock();
2157         fb_set_suspend(fbi, 0);
2158         console_unlock();
2159
2160         vfree(par->store_fb);
2161         vfree(par->store_cursor);
2162 }
2163
2164
2165 /* suspend and resume support */
2166
2167 static int sm501fb_suspend(struct platform_device *pdev, pm_message_t state)
2168 {
2169         struct sm501fb_info *info = platform_get_drvdata(pdev);
2170
2171         /* store crt control to resume with */
2172         info->pm_crt_ctrl = smc501_readl(info->regs + SM501_DC_CRT_CONTROL);
2173
2174         sm501fb_suspend_fb(info, HEAD_CRT);
2175         sm501fb_suspend_fb(info, HEAD_PANEL);
2176
2177         /* turn off the clocks, in case the device is not powered down */
2178         sm501_unit_power(info->dev->parent, SM501_GATE_DISPLAY, 0);
2179
2180         return 0;
2181 }
2182
2183 #define SM501_CRT_CTRL_SAVE (SM501_DC_CRT_CONTROL_TVP |        \
2184                              SM501_DC_CRT_CONTROL_SEL)
2185
2186
2187 static int sm501fb_resume(struct platform_device *pdev)
2188 {
2189         struct sm501fb_info *info = platform_get_drvdata(pdev);
2190         unsigned long crt_ctrl;
2191
2192         sm501_unit_power(info->dev->parent, SM501_GATE_DISPLAY, 1);
2193
2194         /* restore the items we want to be saved for crt control */
2195
2196         crt_ctrl = smc501_readl(info->regs + SM501_DC_CRT_CONTROL);
2197         crt_ctrl &= ~SM501_CRT_CTRL_SAVE;
2198         crt_ctrl |= info->pm_crt_ctrl & SM501_CRT_CTRL_SAVE;
2199         smc501_writel(crt_ctrl, info->regs + SM501_DC_CRT_CONTROL);
2200
2201         sm501fb_resume_fb(info, HEAD_CRT);
2202         sm501fb_resume_fb(info, HEAD_PANEL);
2203
2204         return 0;
2205 }
2206
2207 #else
2208 #define sm501fb_suspend NULL
2209 #define sm501fb_resume  NULL
2210 #endif
2211
2212 static struct platform_driver sm501fb_driver = {
2213         .probe          = sm501fb_probe,
2214         .remove_new     = sm501fb_remove,
2215         .suspend        = sm501fb_suspend,
2216         .resume         = sm501fb_resume,
2217         .driver         = {
2218                 .name   = "sm501-fb",
2219                 .dev_groups     = sm501fb_groups,
2220         },
2221 };
2222
2223 module_platform_driver(sm501fb_driver);
2224
2225 module_param_named(mode, fb_mode, charp, 0);
2226 MODULE_PARM_DESC(mode,
2227         "Specify resolution as \"<xres>x<yres>[-<bpp>][@<refresh>]\" ");
2228 module_param_named(bpp, default_bpp, ulong, 0);
2229 MODULE_PARM_DESC(bpp, "Specify bit-per-pixel if not specified mode");
2230 MODULE_AUTHOR("Ben Dooks, Vincent Sanders");
2231 MODULE_DESCRIPTION("SM501 Framebuffer driver");
2232 MODULE_LICENSE("GPL v2");