drivers/video/s1d13xxxfb.c

   1 /* drivers/video/s1d13xxxfb.c
   2  *
   3  * (c) 2004 Simtec Electronics
   4  * (c) 2005 Thibaut VARENE <varenet@parisc-linux.org>
   5  *
   6  * Driver for Epson S1D13xxx series framebuffer chips
   7  *
   8  * Adapted from
   9  *  linux/drivers/video/skeletonfb.c
  10  *  linux/drivers/video/epson1355fb.c
  11  *  linux/drivers/video/epson/s1d13xxxfb.c (2.4 driver by Epson)
  12  *
  13  * Note, currently only tested on S1D13806 with 16bit CRT.
  14  * As such, this driver might still contain some hardcoded bits relating to
  15  * S1D13806.
  16  * Making it work on other S1D13XXX chips should merely be a matter of adding
  17  * a few switch()s, some missing glue here and there maybe, and split header
  18  * files.
  19  *
  20  * TODO: - handle dual screen display (CRT and LCD at the same time).
  21  *       - check_var(), mode change, etc.
  22  *       - PM untested.
  23  *       - Accelerated interfaces.
  24  *       - Probably not SMP safe :)
  25  *
  26  * This file is subject to the terms and conditions of the GNU General Public
  27  * License. See the file COPYING in the main directory of this archive for
  28  * more details.
  29  */
  30
  31 #include <linux/config.h>
  32 #include <linux/module.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/types.h>
  37 #include <linux/errno.h>
  38 #include <linux/mm.h>
  39 #include <linux/mman.h>
  40 #include <linux/fb.h>
  41
  42 #include <asm/io.h>
  43
  44 #include <video/s1d13xxxfb.h>
  45
  46 #define PFX "s1d13xxxfb: "
  47
  48 #if 0
  49 #define dbg(fmt, args...) do { printk(KERN_INFO fmt, ## args); } while(0)
  50 #else
  51 #define dbg(fmt, args...) do { } while (0)
  52 #endif
  53
  54 /*
  55  * Here we define the default struct fb_fix_screeninfo
  56  */
  57 static struct fb_fix_screeninfo __devinitdata s1d13xxxfb_fix = {
  58         .id             = S1D_FBID,
  59         .type           = FB_TYPE_PACKED_PIXELS,
  60         .visual         = FB_VISUAL_PSEUDOCOLOR,
  61         .xpanstep       = 0,
  62         .ypanstep       = 1,
  63         .ywrapstep      = 0,
  64         .accel          = FB_ACCEL_NONE,
  65 };
  66
  67 static inline u8
  68 s1d13xxxfb_readreg(struct s1d13xxxfb_par *par, u16 regno)
  69 {
  70 #if defined(CONFIG_PLAT_M32700UT) || defined(CONFIG_PLAT_OPSPUT) || defined(CONFIG_PLAT_MAPPI3)
  71         regno=((regno & 1) ? (regno & ~1L) : (regno + 1));
  72 #endif
  73         return readb(par->regs + regno);
  74 }
  75
  76 static inline void
  77 s1d13xxxfb_writereg(struct s1d13xxxfb_par *par, u16 regno, u8 value)
  78 {
  79 #if defined(CONFIG_PLAT_M32700UT) || defined(CONFIG_PLAT_OPSPUT) || defined(CONFIG_PLAT_MAPPI3)
  80         regno=((regno & 1) ? (regno & ~1L) : (regno + 1));
  81 #endif
  82         writeb(value, par->regs + regno);
  83 }
  84
  85 static inline void
  86 s1d13xxxfb_runinit(struct s1d13xxxfb_par *par,
  87                         const struct s1d13xxxfb_regval *initregs,
  88                         const unsigned int size)
  89 {
  90         int i;
  91
  92         for (i = 0; i < size; i++) {
  93                 if ((initregs[i].addr == S1DREG_DELAYOFF) ||
  94                                 (initregs[i].addr == S1DREG_DELAYON))
  95                         mdelay((int)initregs[i].value);
  96                 else {
  97                         s1d13xxxfb_writereg(par, initregs[i].addr, initregs[i].value);
  98                 }
  99         }
 100
 101         /* make sure the hardware can cope with us */
 102         mdelay(1);
 103 }
 104
 105 static inline void
 106 lcd_enable(struct s1d13xxxfb_par *par, int enable)
 107 {
 108         u8 mode = s1d13xxxfb_readreg(par, S1DREG_COM_DISP_MODE);
 109
 110         if (enable)
 111                 mode |= 0x01;
 112         else
 113                 mode &= ~0x01;
 114
 115         s1d13xxxfb_writereg(par, S1DREG_COM_DISP_MODE, mode);
 116 }
 117
 118 static inline void
 119 crt_enable(struct s1d13xxxfb_par *par, int enable)
 120 {
 121         u8 mode = s1d13xxxfb_readreg(par, S1DREG_COM_DISP_MODE);
 122
 123         if (enable)
 124                 mode |= 0x02;
 125         else
 126                 mode &= ~0x02;
 127
 128         s1d13xxxfb_writereg(par, S1DREG_COM_DISP_MODE, mode);
 129 }
 130
 131 /* framebuffer control routines */
 132
 133 static inline void
 134 s1d13xxxfb_setup_pseudocolour(struct fb_info *info)
 135 {
 136         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 137
 138         info->var.red.length = 4;
 139         info->var.green.length = 4;
 140         info->var.blue.length = 4;
 141 }
 142
 143 static inline void
 144 s1d13xxxfb_setup_truecolour(struct fb_info *info)
 145 {
 146         info->fix.visual = FB_VISUAL_TRUECOLOR;
 147         info->var.bits_per_pixel = 16;
 148
 149         info->var.red.length = 5;
 150         info->var.red.offset = 11;
 151
 152         info->var.green.length = 6;
 153         info->var.green.offset = 5;
 154
 155         info->var.blue.length = 5;
 156         info->var.blue.offset = 0;
 157 }
 158
 159 /**
 160  *      s1d13xxxfb_set_par - Alters the hardware state.
 161  *      @info: frame buffer structure
 162  *
 163  *      Using the fb_var_screeninfo in fb_info we set the depth of the
 164  *      framebuffer. This function alters the par AND the
 165  *      fb_fix_screeninfo stored in fb_info. It doesn't not alter var in
 166  *      fb_info since we are using that data. This means we depend on the
 167  *      data in var inside fb_info to be supported by the hardware.
 168  *      xxxfb_check_var is always called before xxxfb_set_par to ensure this.
 169  *
 170  *      XXX TODO: write proper s1d13xxxfb_check_var(), without which that
 171  *      function is quite useless.
 172  */
 173 static int
 174 s1d13xxxfb_set_par(struct fb_info *info)
 175 {
 176         struct s1d13xxxfb_par *s1dfb = info->par;
 177         unsigned int val;
 178
 179         dbg("s1d13xxxfb_set_par: bpp=%d\n", info->var.bits_per_pixel);
 180
 181         if ((s1dfb->display & 0x01))    /* LCD */
 182                 val = s1d13xxxfb_readreg(s1dfb, S1DREG_LCD_DISP_MODE);   /* read colour control */
 183         else    /* CRT */
 184                 val = s1d13xxxfb_readreg(s1dfb, S1DREG_CRT_DISP_MODE);   /* read colour control */
 185
 186         val &= ~0x07;
 187
 188         switch (info->var.bits_per_pixel) {
 189                 case 4:
 190                         dbg("pseudo colour 4\n");
 191                         s1d13xxxfb_setup_pseudocolour(info);
 192                         val |= 2;
 193                         break;
 194                 case 8:
 195                         dbg("pseudo colour 8\n");
 196                         s1d13xxxfb_setup_pseudocolour(info);
 197                         val |= 3;
 198                         break;
 199                 case 16:
 200                         dbg("true colour\n");
 201                         s1d13xxxfb_setup_truecolour(info);
 202                         val |= 5;
 203                         break;
 204
 205                 default:
 206                         dbg("bpp not supported!\n");
 207                         return -EINVAL;
 208         }
 209
 210         dbg("writing %02x to display mode register\n", val);
 211
 212         if ((s1dfb->display & 0x01))    /* LCD */
 213                 s1d13xxxfb_writereg(s1dfb, S1DREG_LCD_DISP_MODE, val);
 214         else    /* CRT */
 215                 s1d13xxxfb_writereg(s1dfb, S1DREG_CRT_DISP_MODE, val);
 216
 217         info->fix.line_length  = info->var.xres * info->var.bits_per_pixel;
 218         info->fix.line_length /= 8;
 219
 220         dbg("setting line_length to %d\n", info->fix.line_length);
 221
 222         dbg("done setup\n");
 223
 224         return 0;
 225 }
 226
 227 /**
 228  *      s1d13xxxfb_setcolreg - sets a color register.
 229  *      @regno: Which register in the CLUT we are programming
 230  *      @red: The red value which can be up to 16 bits wide
 231  *      @green: The green value which can be up to 16 bits wide
 232  *      @blue:  The blue value which can be up to 16 bits wide.
 233  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 234  *      @info: frame buffer info structure
 235  *
 236  *      Returns negative errno on error, or zero on success.
 237  */
 238 static int
 239 s1d13xxxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 240                         u_int transp, struct fb_info *info)
 241 {
 242         struct s1d13xxxfb_par *s1dfb = info->par;
 243         unsigned int pseudo_val;
 244
 245         if (regno >= S1D_PALETTE_SIZE)
 246                 return -EINVAL;
 247
 248         dbg("s1d13xxxfb_setcolreg: %d: rgb=%d,%d,%d, tr=%d\n",
 249                     regno, red, green, blue, transp);
 250
 251         if (info->var.grayscale)
 252                 red = green = blue = (19595*red + 38470*green + 7471*blue) >> 16;
 253
 254         switch (info->fix.visual) {
 255                 case FB_VISUAL_TRUECOLOR:
 256                         if (regno >= 16)
 257                                 return -EINVAL;
 258
 259                         /* deal with creating pseudo-palette entries */
 260
 261                         pseudo_val  = (red   >> 11) << info->var.red.offset;
 262                         pseudo_val |= (green >> 10) << info->var.green.offset;
 263                         pseudo_val |= (blue  >> 11) << info->var.blue.offset;
 264
 265                         dbg("s1d13xxxfb_setcolreg: pseudo %d, val %08x\n",
 266                                     regno, pseudo_val);
 267
 268 #if defined(CONFIG_PLAT_MAPPI)
 269                         ((u32 *)info->pseudo_palette)[regno] = cpu_to_le16(pseudo_val);
 270 #else
 271                         ((u32 *)info->pseudo_palette)[regno] = pseudo_val;
 272 #endif
 273
 274                         break;
 275                 case FB_VISUAL_PSEUDOCOLOR:
 276                         s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_ADDR, regno);
 277                         s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_DATA, red);
 278                         s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_DATA, green);
 279                         s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_DATA, blue);
 280
 281                         break;
 282                 default:
 283                         return -ENOSYS;
 284         }
 285
 286         dbg("s1d13xxxfb_setcolreg: done\n");
 287
 288         return 0;
 289 }
 290
 291 /**
 292  *      s1d13xxxfb_blank - blanks the display.
 293  *      @blank_mode: the blank mode we want.
 294  *      @info: frame buffer structure that represents a single frame buffer
 295  *
 296  *      Blank the screen if blank_mode != 0, else unblank. Return 0 if
 297  *      blanking succeeded, != 0 if un-/blanking failed due to e.g. a
 298  *      video mode which doesn't support it. Implements VESA suspend
 299  *      and powerdown modes on hardware that supports disabling hsync/vsync:
 300  *      blank_mode == 2: suspend vsync
 301  *      blank_mode == 3: suspend hsync
 302  *      blank_mode == 4: powerdown
 303  *
 304  *      Returns negative errno on error, or zero on success.
 305  */
 306 static int
 307 s1d13xxxfb_blank(int blank_mode, struct fb_info *info)
 308 {
 309         struct s1d13xxxfb_par *par = info->par;
 310
 311         dbg("s1d13xxxfb_blank: blank=%d, info=%p\n", blank_mode, info);
 312
 313         switch (blank_mode) {
 314                 case FB_BLANK_UNBLANK:
 315                 case FB_BLANK_NORMAL:
 316                         if ((par->display & 0x01) != 0)
 317                                 lcd_enable(par, 1);
 318                         if ((par->display & 0x02) != 0)
 319                                 crt_enable(par, 1);
 320                         break;
 321                 case FB_BLANK_VSYNC_SUSPEND:
 322                 case FB_BLANK_HSYNC_SUSPEND:
 323                         break;
 324                 case FB_BLANK_POWERDOWN:
 325                         lcd_enable(par, 0);
 326                         crt_enable(par, 0);
 327                         break;
 328                 default:
 329                         return -EINVAL;
 330         }
 331
 332         /* let fbcon do a soft blank for us */
 333         return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
 334 }
 335
 336 /**
 337  *      s1d13xxxfb_pan_display - Pans the display.
 338  *      @var: frame buffer variable screen structure
 339  *      @info: frame buffer structure that represents a single frame buffer
 340  *
 341  *      Pan (or wrap, depending on the `vmode' field) the display using the
 342  *      `yoffset' field of the `var' structure (`xoffset'  not yet supported).
 343  *      If the values don't fit, return -EINVAL.
 344  *
 345  *      Returns negative errno on error, or zero on success.
 346  */
 347 static int
 348 s1d13xxxfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
 349 {
 350         struct s1d13xxxfb_par *par = info->par;
 351         u32 start;
 352
 353         if (var->xoffset != 0)  /* not yet ... */
 354                 return -EINVAL;
 355
 356         if (var->yoffset + info->var.yres > info->var.yres_virtual)
 357                 return -EINVAL;
 358
 359         start = (info->fix.line_length >> 1) * var->yoffset;
 360
 361         if ((par->display & 0x01)) {
 362                 /* LCD */
 363                 s1d13xxxfb_writereg(par, S1DREG_LCD_DISP_START0, (start & 0xff));
 364                 s1d13xxxfb_writereg(par, S1DREG_LCD_DISP_START1, ((start >> 8) & 0xff));
 365                 s1d13xxxfb_writereg(par, S1DREG_LCD_DISP_START2, ((start >> 16) & 0x0f));
 366         } else {
 367                 /* CRT */
 368                 s1d13xxxfb_writereg(par, S1DREG_CRT_DISP_START0, (start & 0xff));
 369                 s1d13xxxfb_writereg(par, S1DREG_CRT_DISP_START1, ((start >> 8) & 0xff));
 370                 s1d13xxxfb_writereg(par, S1DREG_CRT_DISP_START2, ((start >> 16) & 0x0f));
 371         }
 372
 373         return 0;
 374 }
 375
 376
 377 /* framebuffer information structures */
 378
 379 static struct fb_ops s1d13xxxfb_fbops = {
 380         .owner          = THIS_MODULE,
 381         .fb_set_par     = s1d13xxxfb_set_par,
 382         .fb_setcolreg   = s1d13xxxfb_setcolreg,
 383         .fb_blank       = s1d13xxxfb_blank,
 384
 385         .fb_pan_display = s1d13xxxfb_pan_display,
 386
 387         /* to be replaced by any acceleration we can */
 388         .fb_fillrect    = cfb_fillrect,
 389         .fb_copyarea    = cfb_copyarea,
 390         .fb_imageblit   = cfb_imageblit,
 391 };
 392
 393 static int s1d13xxxfb_width_tab[2][4] __devinitdata = {
 394         {4, 8, 16, -1},
 395         {9, 12, 18, -1},
 396 };
 397
 398 /**
 399  *      s1d13xxxfb_fetch_hw_state - Configure the framebuffer according to
 400  *      hardware setup.
 401  *      @info: frame buffer structure
 402  *
 403  *      We setup the framebuffer structures according to the current
 404  *      hardware setup. On some machines, the BIOS will have filled
 405  *      the chip registers with such info, on others, these values will
 406  *      have been written in some init procedure. In any case, the
 407  *      software values needs to match the hardware ones. This is what
 408  *      this function ensures.
 409  *
 410  *      Note: some of the hardcoded values here might need some love to
 411  *      work on various chips, and might need to no longer be hardcoded.
 412  */
 413 static void __devinit
 414 s1d13xxxfb_fetch_hw_state(struct fb_info *info)
 415 {
 416         struct fb_var_screeninfo *var = &info->var;
 417         struct fb_fix_screeninfo *fix = &info->fix;
 418         struct s1d13xxxfb_par *par = info->par;
 419         u8 panel, display;
 420         u16 offset;
 421         u32 xres, yres;
 422         u32 xres_virtual, yres_virtual;
 423         int bpp, lcd_bpp;
 424         int is_color, is_dual, is_tft;
 425         int lcd_enabled, crt_enabled;
 426
 427         fix->type = FB_TYPE_PACKED_PIXELS;
 428
 429         /* general info */
 430         par->display = s1d13xxxfb_readreg(par, S1DREG_COM_DISP_MODE);
 431         crt_enabled = (par->display & 0x02) != 0;
 432         lcd_enabled = (par->display & 0x01) != 0;
 433
 434         if (lcd_enabled && crt_enabled)
 435                 printk(KERN_WARNING PFX "Warning: LCD and CRT detected, using LCD\n");
 436
 437         if (lcd_enabled)
 438                 display = s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_MODE);
 439         else    /* CRT */
 440                 display = s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_MODE);
 441
 442         bpp = display & 0x07;
 443
 444         switch (bpp) {
 445                 case 2: /* 4 bpp */
 446                 case 3: /* 8 bpp */
 447                         var->bits_per_pixel = 8;
 448                         var->red.offset = var->green.offset = var->blue.offset = 0;
 449                         var->red.length = var->green.length = var->blue.length = 8;
 450                         break;
 451                 case 5: /* 16 bpp */
 452                         s1d13xxxfb_setup_truecolour(info);
 453                         break;
 454                 default:
 455                         dbg("bpp: %i\n", bpp);
 456         }
 457         fb_alloc_cmap(&info->cmap, 256, 0);
 458
 459         /* LCD info */
 460         panel = s1d13xxxfb_readreg(par, S1DREG_PANEL_TYPE);
 461         is_color = (panel & 0x04) != 0;
 462         is_dual = (panel & 0x02) != 0;
 463         is_tft = (panel & 0x01) != 0;
 464         lcd_bpp = s1d13xxxfb_width_tab[is_tft][(panel >> 4) & 3];
 465
 466         if (lcd_enabled) {
 467                 xres = (s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_HWIDTH) + 1) * 8;
 468                 yres = (s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_VHEIGHT0) +
 469                         ((s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_VHEIGHT1) & 0x03) << 8) + 1);
 470
 471                 offset = (s1d13xxxfb_readreg(par, S1DREG_LCD_MEM_OFF0) +
 472                         ((s1d13xxxfb_readreg(par, S1DREG_LCD_MEM_OFF1) & 0x7) << 8));
 473         } else { /* crt */
 474                 xres = (s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_HWIDTH) + 1) * 8;
 475                 yres = (s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_VHEIGHT0) +
 476                         ((s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_VHEIGHT1) & 0x03) << 8) + 1);
 477
 478                 offset = (s1d13xxxfb_readreg(par, S1DREG_CRT_MEM_OFF0) +
 479                         ((s1d13xxxfb_readreg(par, S1DREG_CRT_MEM_OFF1) & 0x7) << 8));
 480         }
 481         xres_virtual = offset * 16 / var->bits_per_pixel;
 482         yres_virtual = fix->smem_len / (offset * 2);
 483
 484         var->xres               = xres;
 485         var->yres               = yres;
 486         var->xres_virtual       = xres_virtual;
 487         var->yres_virtual       = yres_virtual;
 488         var->xoffset            = var->yoffset = 0;
 489
 490         fix->line_length        = offset * 2;
 491
 492         var->grayscale          = !is_color;
 493
 494         var->activate           = FB_ACTIVATE_NOW;
 495
 496         dbg(PFX "bpp=%d, lcd_bpp=%d, "
 497                 "crt_enabled=%d, lcd_enabled=%d\n",
 498                 var->bits_per_pixel, lcd_bpp, crt_enabled, lcd_enabled);
 499         dbg(PFX "xres=%d, yres=%d, vxres=%d, vyres=%d "
 500                 "is_color=%d, is_dual=%d, is_tft=%d\n",
 501                 xres, yres, xres_virtual, yres_virtual, is_color, is_dual, is_tft);
 502 }
 503
 504
 505 static int
 506 s1d13xxxfb_remove(struct platform_device *pdev)
 507 {
 508         struct fb_info *info = platform_get_drvdata(pdev);
 509         struct s1d13xxxfb_par *par = NULL;
 510
 511         if (info) {
 512                 par = info->par;
 513                 if (par && par->regs) {
 514                         /* disable output & enable powersave */
 515                         s1d13xxxfb_writereg(par, S1DREG_COM_DISP_MODE, 0x00);
 516                         s1d13xxxfb_writereg(par, S1DREG_PS_CNF, 0x11);
 517                         iounmap(par->regs);
 518                 }
 519
 520                 fb_dealloc_cmap(&info->cmap);
 521
 522                 if (info->screen_base)
 523                         iounmap(info->screen_base);
 524
 525                 framebuffer_release(info);
 526         }
 527
 528         release_mem_region(pdev->resource[0].start,
 529                         pdev->resource[0].end - pdev->resource[0].start +1);
 530         release_mem_region(pdev->resource[1].start,
 531                         pdev->resource[1].end - pdev->resource[1].start +1);
 532         return 0;
 533 }
 534
 535 static int __devinit
 536 s1d13xxxfb_probe(struct platform_device *pdev)
 537 {
 538         struct s1d13xxxfb_par *default_par;
 539         struct fb_info *info;
 540         struct s1d13xxxfb_pdata *pdata = NULL;
 541         int ret = 0;
 542         u8 revision;
 543
 544         dbg("probe called: device is %p\n", dev);
 545
 546         printk(KERN_INFO "Epson S1D13XXX FB Driver\n");
 547
 548         /* enable platform-dependent hardware glue, if any */
 549         if (pdev->dev.platform_data)
 550                 pdata = pdev->dev.platform_data;
 551
 552         if (pdata && pdata->platform_init_video)
 553                 pdata->platform_init_video();
 554
 555
 556         if (pdev->num_resources != 2) {
 557                 dev_err(&pdev->dev, "invalid num_resources: %i\n",
 558                        pdev->num_resources);
 559                 ret = -ENODEV;
 560                 goto bail;
 561         }
 562
 563         /* resource[0] is VRAM, resource[1] is registers */
 564         if (pdev->resource[0].flags != IORESOURCE_MEM
 565                         || pdev->resource[1].flags != IORESOURCE_MEM) {
 566                 dev_err(&pdev->dev, "invalid resource type\n");
 567                 ret = -ENODEV;
 568                 goto bail;
 569         }
 570
 571         if (!request_mem_region(pdev->resource[0].start,
 572                 pdev->resource[0].end - pdev->resource[0].start +1, "s1d13xxxfb mem")) {
 573                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
 574                 ret = -EBUSY;
 575                 goto bail;
 576         }
 577
 578         if (!request_mem_region(pdev->resource[1].start,
 579                 pdev->resource[1].end - pdev->resource[1].start +1, "s1d13xxxfb regs")) {
 580                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
 581                 ret = -EBUSY;
 582                 goto bail;
 583         }
 584
 585         info = framebuffer_alloc(sizeof(struct s1d13xxxfb_par) + sizeof(u32) * 256, &pdev->dev);
 586         if (!info) {
 587                 ret = -ENOMEM;
 588                 goto bail;
 589         }
 590
 591         platform_set_drvdata(pdev, info);
 592         default_par = info->par;
 593         default_par->regs = ioremap_nocache(pdev->resource[1].start,
 594                         pdev->resource[1].end - pdev->resource[1].start +1);
 595         if (!default_par->regs) {
 596                 printk(KERN_ERR PFX "unable to map registers\n");
 597                 ret = -ENOMEM;
 598                 goto bail;
 599         }
 600         info->pseudo_palette = default_par->pseudo_palette;
 601
 602         info->screen_base = ioremap_nocache(pdev->resource[0].start,
 603                         pdev->resource[0].end - pdev->resource[0].start +1);
 604
 605         if (!info->screen_base) {
 606                 printk(KERN_ERR PFX "unable to map framebuffer\n");
 607                 ret = -ENOMEM;
 608                 goto bail;
 609         }
 610
 611         revision = s1d13xxxfb_readreg(default_par, S1DREG_REV_CODE);
 612         if ((revision >> 2) != S1D_CHIP_REV) {
 613                 printk(KERN_INFO PFX "chip not found: %i\n", (revision >> 2));
 614                 ret = -ENODEV;
 615                 goto bail;
 616         }
 617
 618         info->fix = s1d13xxxfb_fix;
 619         info->fix.mmio_start = pdev->resource[1].start;
 620         info->fix.mmio_len = pdev->resource[1].end - pdev->resource[1].start +1;
 621         info->fix.smem_start = pdev->resource[0].start;
 622         info->fix.smem_len = pdev->resource[0].end - pdev->resource[0].start +1;
 623
 624         printk(KERN_INFO PFX "regs mapped at 0x%p, fb %d KiB mapped at 0x%p\n",
 625                default_par->regs, info->fix.smem_len / 1024, info->screen_base);
 626
 627         info->par = default_par;
 628         info->fbops = &s1d13xxxfb_fbops;
 629         info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
 630
 631         /* perform "manual" chip initialization, if needed */
 632         if (pdata && pdata->initregs)
 633                 s1d13xxxfb_runinit(info->par, pdata->initregs, pdata->initregssize);
 634
 635         s1d13xxxfb_fetch_hw_state(info);
 636
 637         if (register_framebuffer(info) < 0) {
 638                 ret = -EINVAL;
 639                 goto bail;
 640         }
 641
 642         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 643                info->node, info->fix.id);
 644
 645         return 0;
 646
 647 bail:
 648         s1d13xxxfb_remove(pdev);
 649         return ret;
 650
 651 }
 652
 653 #ifdef CONFIG_PM
 654 static int s1d13xxxfb_suspend(struct platform_device *dev, pm_message_t state)
 655 {
 656         struct fb_info *info = platform_get_drvdata(dev);
 657         struct s1d13xxxfb_par *s1dfb = info->par;
 658         struct s1d13xxxfb_pdata *pdata = NULL;
 659
 660         /* disable display */
 661         lcd_enable(s1dfb, 0);
 662         crt_enable(s1dfb, 0);
 663
 664         if (dev->dev.platform_data)
 665                 pdata = dev->dev.platform_data;
 666
 667 #if 0
 668         if (!s1dfb->disp_save)
 669                 s1dfb->disp_save = kmalloc(info->fix.smem_len, GFP_KERNEL);
 670
 671         if (!s1dfb->disp_save) {
 672                 printk(KERN_ERR PFX "no memory to save screen");
 673                 return -ENOMEM;
 674         }
 675
 676         memcpy_fromio(s1dfb->disp_save, info->screen_base, info->fix.smem_len);
 677 #else
 678         s1dfb->disp_save = NULL;
 679 #endif
 680
 681         if (!s1dfb->regs_save)
 682                 s1dfb->regs_save = kmalloc(info->fix.mmio_len, GFP_KERNEL);
 683
 684         if (!s1dfb->regs_save) {
 685                 printk(KERN_ERR PFX "no memory to save registers");
 686                 return -ENOMEM;
 687         }
 688
 689         /* backup all registers */
 690         memcpy_fromio(s1dfb->regs_save, s1dfb->regs, info->fix.mmio_len);
 691
 692         /* now activate power save mode */
 693         s1d13xxxfb_writereg(s1dfb, S1DREG_PS_CNF, 0x11);
 694
 695         if (pdata && pdata->platform_suspend_video)
 696                 return pdata->platform_suspend_video();
 697         else
 698                 return 0;
 699 }
 700
 701 static int s1d13xxxfb_resume(struct platform_device *dev)
 702 {
 703         struct fb_info *info = platform_get_drvdata(dev);
 704         struct s1d13xxxfb_par *s1dfb = info->par;
 705         struct s1d13xxxfb_pdata *pdata = NULL;
 706
 707         /* awaken the chip */
 708         s1d13xxxfb_writereg(s1dfb, S1DREG_PS_CNF, 0x10);
 709
 710         /* do not let go until SDRAM "wakes up" */
 711         while ((s1d13xxxfb_readreg(s1dfb, S1DREG_PS_STATUS) & 0x01))
 712                 udelay(10);
 713
 714         if (dev->dev.platform_data)
 715                 pdata = dev->dev.platform_data;
 716
 717         if (s1dfb->regs_save) {
 718                 /* will write RO regs, *should* get away with it :) */
 719                 memcpy_toio(s1dfb->regs, s1dfb->regs_save, info->fix.mmio_len);
 720                 kfree(s1dfb->regs_save);
 721         }
 722
 723         if (s1dfb->disp_save) {
 724                 memcpy_toio(info->screen_base, s1dfb->disp_save,
 725                                 info->fix.smem_len);
 726                 kfree(s1dfb->disp_save);        /* XXX kmalloc()'d when? */
 727         }
 728
 729         if ((s1dfb->display & 0x01) != 0)
 730                 lcd_enable(s1dfb, 1);
 731         if ((s1dfb->display & 0x02) != 0)
 732                 crt_enable(s1dfb, 1);
 733
 734         if (pdata && pdata->platform_resume_video)
 735                 return pdata->platform_resume_video();
 736         else
 737                 return 0;
 738 }
 739 #endif /* CONFIG_PM */
 740
 741 static struct platform_driver s1d13xxxfb_driver = {
 742         .probe          = s1d13xxxfb_probe,
 743         .remove         = s1d13xxxfb_remove,
 744 #ifdef CONFIG_PM
 745         .suspend        = s1d13xxxfb_suspend,
 746         .resume         = s1d13xxxfb_resume,
 747 #endif
 748         .driver         = {
 749                 .name   = S1D_DEVICENAME,
 750         },
 751 };
 752
 753
 754 static int __init
 755 s1d13xxxfb_init(void)
 756 {
 757         if (fb_get_options("s1d13xxxfb", NULL))
 758                 return -ENODEV;
 759
 760         return platform_driver_register(&s1d13xxxfb_driver);
 761 }
 762
 763
 764 static void __exit
 765 s1d13xxxfb_exit(void)
 766 {
 767         platform_driver_unregister(&s1d13xxxfb_driver);
 768 }
 769
 770 module_init(s1d13xxxfb_init);
 771 module_exit(s1d13xxxfb_exit);
 772
 773
 774 MODULE_LICENSE("GPL");
 775 MODULE_DESCRIPTION("Framebuffer driver for S1D13xxx devices");
 776 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, Thibaut VARENE <varenet@parisc-linux.org>");