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