drivers/video/atmel_lcdfb.c

   1 /*
   2  *  Driver for AT91/AT32 LCD Controller
   3  *
   4  *  Copyright (C) 2007 Atmel Corporation
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file COPYING in the main directory of this archive for
   8  * more details.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/dma-mapping.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/clk.h>
  16 #include <linux/fb.h>
  17 #include <linux/init.h>
  18 #include <linux/delay.h>
  19 #include <linux/backlight.h>
  20 #include <linux/gfp.h>
  21
  22 #include <mach/board.h>
  23 #include <mach/cpu.h>
  24 #include <mach/gpio.h>
  25
  26 #include <video/atmel_lcdc.h>
  27
  28 #define lcdc_readl(sinfo, reg)          __raw_readl((sinfo)->mmio+(reg))
  29 #define lcdc_writel(sinfo, reg, val)    __raw_writel((val), (sinfo)->mmio+(reg))
  30
  31 /* configurable parameters */
  32 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
  33 #define ATMEL_LCDC_DMA_BURST_LEN        8       /* words */
  34 #define ATMEL_LCDC_FIFO_SIZE            512     /* words */
  35
  36 #if defined(CONFIG_ARCH_AT91)
  37 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
  38                                          | FBINFO_PARTIAL_PAN_OK \
  39                                          | FBINFO_HWACCEL_YPAN)
  40
  41 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
  42                                         struct fb_var_screeninfo *var,
  43                                         struct fb_info *info)
  44 {
  45
  46 }
  47 #elif defined(CONFIG_AVR32)
  48 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
  49                                         | FBINFO_PARTIAL_PAN_OK \
  50                                         | FBINFO_HWACCEL_XPAN \
  51                                         | FBINFO_HWACCEL_YPAN)
  52
  53 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
  54                                      struct fb_var_screeninfo *var,
  55                                      struct fb_info *info)
  56 {
  57         u32 dma2dcfg;
  58         u32 pixeloff;
  59
  60         pixeloff = (var->xoffset * info->var.bits_per_pixel) & 0x1f;
  61
  62         dma2dcfg = (info->var.xres_virtual - info->var.xres)
  63                  * info->var.bits_per_pixel / 8;
  64         dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
  65         lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
  66
  67         /* Update configuration */
  68         lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
  69                     lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
  70                     | ATMEL_LCDC_DMAUPDT);
  71 }
  72 #endif
  73
  74 static u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
  75                 | ATMEL_LCDC_POL_POSITIVE
  76                 | ATMEL_LCDC_ENA_PWMENABLE;
  77
  78 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
  79
  80 /* some bl->props field just changed */
  81 static int atmel_bl_update_status(struct backlight_device *bl)
  82 {
  83         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
  84         int                     power = sinfo->bl_power;
  85         int                     brightness = bl->props.brightness;
  86
  87         /* REVISIT there may be a meaningful difference between
  88          * fb_blank and power ... there seem to be some cases
  89          * this doesn't handle correctly.
  90          */
  91         if (bl->props.fb_blank != sinfo->bl_power)
  92                 power = bl->props.fb_blank;
  93         else if (bl->props.power != sinfo->bl_power)
  94                 power = bl->props.power;
  95
  96         if (brightness < 0 && power == FB_BLANK_UNBLANK)
  97                 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
  98         else if (power != FB_BLANK_UNBLANK)
  99                 brightness = 0;
 100
 101         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
 102         if (contrast_ctr & ATMEL_LCDC_POL_POSITIVE)
 103                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
 104                         brightness ? contrast_ctr : 0);
 105         else
 106                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 107
 108         bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
 109
 110         return 0;
 111 }
 112
 113 static int atmel_bl_get_brightness(struct backlight_device *bl)
 114 {
 115         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 116
 117         return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 118 }
 119
 120 static const struct backlight_ops atmel_lcdc_bl_ops = {
 121         .update_status = atmel_bl_update_status,
 122         .get_brightness = atmel_bl_get_brightness,
 123 };
 124
 125 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 126 {
 127         struct backlight_properties props;
 128         struct backlight_device *bl;
 129
 130         sinfo->bl_power = FB_BLANK_UNBLANK;
 131
 132         if (sinfo->backlight)
 133                 return;
 134
 135         memset(&props, 0, sizeof(struct backlight_properties));
 136         props.type = BACKLIGHT_RAW;
 137         props.max_brightness = 0xff;
 138         bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo,
 139                                        &atmel_lcdc_bl_ops, &props);
 140         if (IS_ERR(bl)) {
 141                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
 142                                 PTR_ERR(bl));
 143                 return;
 144         }
 145         sinfo->backlight = bl;
 146
 147         bl->props.power = FB_BLANK_UNBLANK;
 148         bl->props.fb_blank = FB_BLANK_UNBLANK;
 149         bl->props.brightness = atmel_bl_get_brightness(bl);
 150 }
 151
 152 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 153 {
 154         if (sinfo->backlight)
 155                 backlight_device_unregister(sinfo->backlight);
 156 }
 157
 158 #else
 159
 160 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 161 {
 162         dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
 163 }
 164
 165 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 166 {
 167 }
 168
 169 #endif
 170
 171 static void init_contrast(struct atmel_lcdfb_info *sinfo)
 172 {
 173         /* contrast pwm can be 'inverted' */
 174         if (sinfo->lcdcon_pol_negative)
 175                         contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
 176
 177         /* have some default contrast/backlight settings */
 178         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 179         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 180
 181         if (sinfo->lcdcon_is_backlight)
 182                 init_backlight(sinfo);
 183 }
 184
 185
 186 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
 187         .type           = FB_TYPE_PACKED_PIXELS,
 188         .visual         = FB_VISUAL_TRUECOLOR,
 189         .xpanstep       = 0,
 190         .ypanstep       = 1,
 191         .ywrapstep      = 0,
 192         .accel          = FB_ACCEL_NONE,
 193 };
 194
 195 static unsigned long compute_hozval(unsigned long xres, unsigned long lcdcon2)
 196 {
 197         unsigned long value;
 198
 199         if (!(cpu_is_at91sam9261() || cpu_is_at91sam9g10()
 200                 || cpu_is_at32ap7000()))
 201                 return xres;
 202
 203         value = xres;
 204         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
 205                 /* STN display */
 206                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
 207                         value *= 3;
 208                 }
 209                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
 210                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
 211                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
 212                         value = DIV_ROUND_UP(value, 4);
 213                 else
 214                         value = DIV_ROUND_UP(value, 8);
 215         }
 216
 217         return value;
 218 }
 219
 220 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
 221 {
 222         /* Turn off the LCD controller and the DMA controller */
 223         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 224                         sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
 225
 226         /* Wait for the LCDC core to become idle */
 227         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 228                 msleep(10);
 229
 230         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
 231 }
 232
 233 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
 234 {
 235         atmel_lcdfb_stop_nowait(sinfo);
 236
 237         /* Wait for DMA engine to become idle... */
 238         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 239                 msleep(10);
 240 }
 241
 242 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
 243 {
 244         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon);
 245         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 246                 (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
 247                 | ATMEL_LCDC_PWR);
 248 }
 249
 250 static void atmel_lcdfb_update_dma(struct fb_info *info,
 251                                struct fb_var_screeninfo *var)
 252 {
 253         struct atmel_lcdfb_info *sinfo = info->par;
 254         struct fb_fix_screeninfo *fix = &info->fix;
 255         unsigned long dma_addr;
 256
 257         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
 258                     + var->xoffset * info->var.bits_per_pixel / 8);
 259
 260         dma_addr &= ~3UL;
 261
 262         /* Set framebuffer DMA base address and pixel offset */
 263         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
 264
 265         atmel_lcdfb_update_dma2d(sinfo, var, info);
 266 }
 267
 268 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
 269 {
 270         struct fb_info *info = sinfo->info;
 271
 272         dma_free_writecombine(info->device, info->fix.smem_len,
 273                                 info->screen_base, info->fix.smem_start);
 274 }
 275
 276 /**
 277  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
 278  *      @sinfo: the frame buffer to allocate memory for
 279  *
 280  *      This function is called only from the atmel_lcdfb_probe()
 281  *      so no locking by fb_info->mm_lock around smem_len setting is needed.
 282  */
 283 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
 284 {
 285         struct fb_info *info = sinfo->info;
 286         struct fb_var_screeninfo *var = &info->var;
 287         unsigned int smem_len;
 288
 289         smem_len = (var->xres_virtual * var->yres_virtual
 290                     * ((var->bits_per_pixel + 7) / 8));
 291         info->fix.smem_len = max(smem_len, sinfo->smem_len);
 292
 293         info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
 294                                         (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
 295
 296         if (!info->screen_base) {
 297                 return -ENOMEM;
 298         }
 299
 300         memset(info->screen_base, 0, info->fix.smem_len);
 301
 302         return 0;
 303 }
 304
 305 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
 306                                                      struct fb_info *info)
 307 {
 308         struct fb_videomode varfbmode;
 309         const struct fb_videomode *fbmode = NULL;
 310
 311         fb_var_to_videomode(&varfbmode, var);
 312         fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
 313         if (fbmode)
 314                 fb_videomode_to_var(var, fbmode);
 315         return fbmode;
 316 }
 317
 318
 319 /**
 320  *      atmel_lcdfb_check_var - Validates a var passed in.
 321  *      @var: frame buffer variable screen structure
 322  *      @info: frame buffer structure that represents a single frame buffer
 323  *
 324  *      Checks to see if the hardware supports the state requested by
 325  *      var passed in. This function does not alter the hardware
 326  *      state!!!  This means the data stored in struct fb_info and
 327  *      struct atmel_lcdfb_info do not change. This includes the var
 328  *      inside of struct fb_info.  Do NOT change these. This function
 329  *      can be called on its own if we intent to only test a mode and
 330  *      not actually set it. The stuff in modedb.c is a example of
 331  *      this. If the var passed in is slightly off by what the
 332  *      hardware can support then we alter the var PASSED in to what
 333  *      we can do. If the hardware doesn't support mode change a
 334  *      -EINVAL will be returned by the upper layers. You don't need
 335  *      to implement this function then. If you hardware doesn't
 336  *      support changing the resolution then this function is not
 337  *      needed. In this case the driver would just provide a var that
 338  *      represents the static state the screen is in.
 339  *
 340  *      Returns negative errno on error, or zero on success.
 341  */
 342 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
 343                              struct fb_info *info)
 344 {
 345         struct device *dev = info->device;
 346         struct atmel_lcdfb_info *sinfo = info->par;
 347         unsigned long clk_value_khz;
 348
 349         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 350
 351         dev_dbg(dev, "%s:\n", __func__);
 352
 353         if (!(var->pixclock && var->bits_per_pixel)) {
 354                 /* choose a suitable mode if possible */
 355                 if (!atmel_lcdfb_choose_mode(var, info)) {
 356                         dev_err(dev, "needed value not specified\n");
 357                         return -EINVAL;
 358                 }
 359         }
 360
 361         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
 362         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
 363         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
 364         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
 365
 366         if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
 367                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
 368                 return -EINVAL;
 369         }
 370
 371         /* Do not allow to have real resoulution larger than virtual */
 372         if (var->xres > var->xres_virtual)
 373                 var->xres_virtual = var->xres;
 374
 375         if (var->yres > var->yres_virtual)
 376                 var->yres_virtual = var->yres;
 377
 378         /* Force same alignment for each line */
 379         var->xres = (var->xres + 3) & ~3UL;
 380         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
 381
 382         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
 383         var->transp.msb_right = 0;
 384         var->transp.offset = var->transp.length = 0;
 385         var->xoffset = var->yoffset = 0;
 386
 387         if (info->fix.smem_len) {
 388                 unsigned int smem_len = (var->xres_virtual * var->yres_virtual
 389                                          * ((var->bits_per_pixel + 7) / 8));
 390                 if (smem_len > info->fix.smem_len)
 391                         return -EINVAL;
 392         }
 393
 394         /* Saturate vertical and horizontal timings at maximum values */
 395         var->vsync_len = min_t(u32, var->vsync_len,
 396                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
 397         var->upper_margin = min_t(u32, var->upper_margin,
 398                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
 399         var->lower_margin = min_t(u32, var->lower_margin,
 400                         ATMEL_LCDC_VFP);
 401         var->right_margin = min_t(u32, var->right_margin,
 402                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 2);
 403         var->hsync_len = min_t(u32, var->hsync_len,
 404                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
 405         var->left_margin = min_t(u32, var->left_margin,
 406                         ATMEL_LCDC_HBP + 1);
 407
 408         /* Some parameters can't be zero */
 409         var->vsync_len = max_t(u32, var->vsync_len, 1);
 410         var->right_margin = max_t(u32, var->right_margin, 1);
 411         var->hsync_len = max_t(u32, var->hsync_len, 1);
 412         var->left_margin = max_t(u32, var->left_margin, 1);
 413
 414         switch (var->bits_per_pixel) {
 415         case 1:
 416         case 2:
 417         case 4:
 418         case 8:
 419                 var->red.offset = var->green.offset = var->blue.offset = 0;
 420                 var->red.length = var->green.length = var->blue.length
 421                         = var->bits_per_pixel;
 422                 break;
 423         case 15:
 424         case 16:
 425                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 426                         /* RGB:565 mode */
 427                         var->red.offset = 11;
 428                         var->blue.offset = 0;
 429                         var->green.length = 6;
 430                 } else if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB555) {
 431                         var->red.offset = 10;
 432                         var->blue.offset = 0;
 433                         var->green.length = 5;
 434                 } else {
 435                         /* BGR:555 mode */
 436                         var->red.offset = 0;
 437                         var->blue.offset = 10;
 438                         var->green.length = 5;
 439                 }
 440                 var->green.offset = 5;
 441                 var->red.length = var->blue.length = 5;
 442                 break;
 443         case 32:
 444                 var->transp.offset = 24;
 445                 var->transp.length = 8;
 446                 /* fall through */
 447         case 24:
 448                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 449                         /* RGB:888 mode */
 450                         var->red.offset = 16;
 451                         var->blue.offset = 0;
 452                 } else {
 453                         /* BGR:888 mode */
 454                         var->red.offset = 0;
 455                         var->blue.offset = 16;
 456                 }
 457                 var->green.offset = 8;
 458                 var->red.length = var->green.length = var->blue.length = 8;
 459                 break;
 460         default:
 461                 dev_err(dev, "color depth %d not supported\n",
 462                                         var->bits_per_pixel);
 463                 return -EINVAL;
 464         }
 465
 466         return 0;
 467 }
 468
 469 /*
 470  * LCD reset sequence
 471  */
 472 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
 473 {
 474         might_sleep();
 475
 476         atmel_lcdfb_stop(sinfo);
 477         atmel_lcdfb_start(sinfo);
 478 }
 479
 480 /**
 481  *      atmel_lcdfb_set_par - Alters the hardware state.
 482  *      @info: frame buffer structure that represents a single frame buffer
 483  *
 484  *      Using the fb_var_screeninfo in fb_info we set the resolution
 485  *      of the this particular framebuffer. This function alters the
 486  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
 487  *      not alter var in fb_info since we are using that data. This
 488  *      means we depend on the data in var inside fb_info to be
 489  *      supported by the hardware.  atmel_lcdfb_check_var is always called
 490  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
 491  *      change the resolution you don't need this function.
 492  *
 493  */
 494 static int atmel_lcdfb_set_par(struct fb_info *info)
 495 {
 496         struct atmel_lcdfb_info *sinfo = info->par;
 497         unsigned long hozval_linesz;
 498         unsigned long value;
 499         unsigned long clk_value_khz;
 500         unsigned long bits_per_line;
 501         unsigned long pix_factor = 2;
 502
 503         might_sleep();
 504
 505         dev_dbg(info->device, "%s:\n", __func__);
 506         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
 507                  info->var.xres, info->var.yres,
 508                  info->var.xres_virtual, info->var.yres_virtual);
 509
 510         atmel_lcdfb_stop_nowait(sinfo);
 511
 512         if (info->var.bits_per_pixel == 1)
 513                 info->fix.visual = FB_VISUAL_MONO01;
 514         else if (info->var.bits_per_pixel <= 8)
 515                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 516         else
 517                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 518
 519         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
 520         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
 521
 522         /* Re-initialize the DMA engine... */
 523         dev_dbg(info->device, "  * update DMA engine\n");
 524         atmel_lcdfb_update_dma(info, &info->var);
 525
 526         /* ...set frame size and burst length = 8 words (?) */
 527         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
 528         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 529         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
 530
 531         /* Now, the LCDC core... */
 532
 533         /* Set pixel clock */
 534         if (cpu_is_at91sam9g45() && !cpu_is_at91sam9g45es())
 535                 pix_factor = 1;
 536
 537         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 538
 539         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
 540
 541         if (value < pix_factor) {
 542                 dev_notice(info->device, "Bypassing pixel clock divider\n");
 543                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 544         } else {
 545                 value = (value / pix_factor) - 1;
 546                 dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
 547                                 value);
 548                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
 549                                 value << ATMEL_LCDC_CLKVAL_OFFSET);
 550                 info->var.pixclock =
 551                         KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1)));
 552                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
 553                                         PICOS2KHZ(info->var.pixclock));
 554         }
 555
 556
 557         /* Initialize control register 2 */
 558         value = sinfo->default_lcdcon2;
 559
 560         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
 561                 value |= ATMEL_LCDC_INVLINE_INVERTED;
 562         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
 563                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
 564
 565         switch (info->var.bits_per_pixel) {
 566                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
 567                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
 568                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
 569                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
 570                 case 15: /* fall through */
 571                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
 572                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
 573                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
 574                 default: BUG(); break;
 575         }
 576         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
 577         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
 578
 579         /* Vertical timing */
 580         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 581         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
 582         value |= info->var.lower_margin;
 583         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
 584         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
 585
 586         /* Horizontal timing */
 587         value = (info->var.right_margin - 2) << ATMEL_LCDC_HFP_OFFSET;
 588         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 589         value |= (info->var.left_margin - 1);
 590         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
 591         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
 592
 593         /* Horizontal value (aka line size) */
 594         hozval_linesz = compute_hozval(info->var.xres,
 595                                         lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2));
 596
 597         /* Display size */
 598         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 599         value |= info->var.yres - 1;
 600         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
 601         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
 602
 603         /* FIFO Threshold: Use formula from data sheet */
 604         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 605         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
 606
 607         /* Toggle LCD_MODE every frame */
 608         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
 609
 610         /* Disable all interrupts */
 611         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
 612         /* Enable FIFO & DMA errors */
 613         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
 614
 615         /* ...wait for DMA engine to become idle... */
 616         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 617                 msleep(10);
 618
 619         atmel_lcdfb_start(sinfo);
 620
 621         dev_dbg(info->device, "  * DONE\n");
 622
 623         return 0;
 624 }
 625
 626 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
 627 {
 628         chan &= 0xffff;
 629         chan >>= 16 - bf->length;
 630         return chan << bf->offset;
 631 }
 632
 633 /**
 634  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
 635  *      @regno: Which register in the CLUT we are programming
 636  *      @red: The red value which can be up to 16 bits wide
 637  *      @green: The green value which can be up to 16 bits wide
 638  *      @blue:  The blue value which can be up to 16 bits wide.
 639  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 640  *      @info: frame buffer info structure
 641  *
 642  *      Set a single color register. The values supplied have a 16 bit
 643  *      magnitude which needs to be scaled in this function for the hardware.
 644  *      Things to take into consideration are how many color registers, if
 645  *      any, are supported with the current color visual. With truecolor mode
 646  *      no color palettes are supported. Here a pseudo palette is created
 647  *      which we store the value in pseudo_palette in struct fb_info. For
 648  *      pseudocolor mode we have a limited color palette. To deal with this
 649  *      we can program what color is displayed for a particular pixel value.
 650  *      DirectColor is similar in that we can program each color field. If
 651  *      we have a static colormap we don't need to implement this function.
 652  *
 653  *      Returns negative errno on error, or zero on success. In an
 654  *      ideal world, this would have been the case, but as it turns
 655  *      out, the other drivers return 1 on failure, so that's what
 656  *      we're going to do.
 657  */
 658 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
 659                              unsigned int green, unsigned int blue,
 660                              unsigned int transp, struct fb_info *info)
 661 {
 662         struct atmel_lcdfb_info *sinfo = info->par;
 663         unsigned int val;
 664         u32 *pal;
 665         int ret = 1;
 666
 667         if (info->var.grayscale)
 668                 red = green = blue = (19595 * red + 38470 * green
 669                                       + 7471 * blue) >> 16;
 670
 671         switch (info->fix.visual) {
 672         case FB_VISUAL_TRUECOLOR:
 673                 if (regno < 16) {
 674                         pal = info->pseudo_palette;
 675
 676                         val  = chan_to_field(red, &info->var.red);
 677                         val |= chan_to_field(green, &info->var.green);
 678                         val |= chan_to_field(blue, &info->var.blue);
 679
 680                         pal[regno] = val;
 681                         ret = 0;
 682                 }
 683                 break;
 684
 685         case FB_VISUAL_PSEUDOCOLOR:
 686                 if (regno < 256) {
 687                         if (cpu_is_at91sam9261() || cpu_is_at91sam9263()
 688                             || cpu_is_at91sam9rl()) {
 689                                 /* old style I+BGR:555 */
 690                                 val  = ((red   >> 11) & 0x001f);
 691                                 val |= ((green >>  6) & 0x03e0);
 692                                 val |= ((blue  >>  1) & 0x7c00);
 693
 694                                 /*
 695                                  * TODO: intensity bit. Maybe something like
 696                                  *   ~(red[10] ^ green[10] ^ blue[10]) & 1
 697                                  */
 698                         } else {
 699                                 /* new style BGR:565 / RGB:565 */
 700                                 if (sinfo->lcd_wiring_mode ==
 701                                     ATMEL_LCDC_WIRING_RGB) {
 702                                         val  = ((blue >> 11) & 0x001f);
 703                                         val |= ((red  >>  0) & 0xf800);
 704                                 } else {
 705                                         val  = ((red  >> 11) & 0x001f);
 706                                         val |= ((blue >>  0) & 0xf800);
 707                                 }
 708
 709                                 val |= ((green >>  5) & 0x07e0);
 710                         }
 711
 712                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 713                         ret = 0;
 714                 }
 715                 break;
 716
 717         case FB_VISUAL_MONO01:
 718                 if (regno < 2) {
 719                         val = (regno == 0) ? 0x00 : 0x1F;
 720                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 721                         ret = 0;
 722                 }
 723                 break;
 724
 725         }
 726
 727         return ret;
 728 }
 729
 730 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
 731                                struct fb_info *info)
 732 {
 733         dev_dbg(info->device, "%s\n", __func__);
 734
 735         atmel_lcdfb_update_dma(info, var);
 736
 737         return 0;
 738 }
 739
 740 static int atmel_lcdfb_blank(int blank_mode, struct fb_info *info)
 741 {
 742         struct atmel_lcdfb_info *sinfo = info->par;
 743
 744         switch (blank_mode) {
 745         case FB_BLANK_UNBLANK:
 746         case FB_BLANK_NORMAL:
 747                 atmel_lcdfb_start(sinfo);
 748                 break;
 749         case FB_BLANK_VSYNC_SUSPEND:
 750         case FB_BLANK_HSYNC_SUSPEND:
 751                 break;
 752         case FB_BLANK_POWERDOWN:
 753                 atmel_lcdfb_stop(sinfo);
 754                 break;
 755         default:
 756                 return -EINVAL;
 757         }
 758
 759         /* let fbcon do a soft blank for us */
 760         return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
 761 }
 762
 763 static struct fb_ops atmel_lcdfb_ops = {
 764         .owner          = THIS_MODULE,
 765         .fb_check_var   = atmel_lcdfb_check_var,
 766         .fb_set_par     = atmel_lcdfb_set_par,
 767         .fb_setcolreg   = atmel_lcdfb_setcolreg,
 768         .fb_blank       = atmel_lcdfb_blank,
 769         .fb_pan_display = atmel_lcdfb_pan_display,
 770         .fb_fillrect    = cfb_fillrect,
 771         .fb_copyarea    = cfb_copyarea,
 772         .fb_imageblit   = cfb_imageblit,
 773 };
 774
 775 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
 776 {
 777         struct fb_info *info = dev_id;
 778         struct atmel_lcdfb_info *sinfo = info->par;
 779         u32 status;
 780
 781         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
 782         if (status & ATMEL_LCDC_UFLWI) {
 783                 dev_warn(info->device, "FIFO underflow %#x\n", status);
 784                 /* reset DMA and FIFO to avoid screen shifting */
 785                 schedule_work(&sinfo->task);
 786         }
 787         lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
 788         return IRQ_HANDLED;
 789 }
 790
 791 /*
 792  * LCD controller task (to reset the LCD)
 793  */
 794 static void atmel_lcdfb_task(struct work_struct *work)
 795 {
 796         struct atmel_lcdfb_info *sinfo =
 797                 container_of(work, struct atmel_lcdfb_info, task);
 798
 799         atmel_lcdfb_reset(sinfo);
 800 }
 801
 802 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
 803 {
 804         struct fb_info *info = sinfo->info;
 805         int ret = 0;
 806
 807         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
 808
 809         dev_info(info->device,
 810                "%luKiB frame buffer at %08lx (mapped at %p)\n",
 811                (unsigned long)info->fix.smem_len / 1024,
 812                (unsigned long)info->fix.smem_start,
 813                info->screen_base);
 814
 815         /* Allocate colormap */
 816         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 817         if (ret < 0)
 818                 dev_err(info->device, "Alloc color map failed\n");
 819
 820         return ret;
 821 }
 822
 823 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
 824 {
 825         if (sinfo->bus_clk)
 826                 clk_enable(sinfo->bus_clk);
 827         clk_enable(sinfo->lcdc_clk);
 828 }
 829
 830 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
 831 {
 832         if (sinfo->bus_clk)
 833                 clk_disable(sinfo->bus_clk);
 834         clk_disable(sinfo->lcdc_clk);
 835 }
 836
 837
 838 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
 839 {
 840         struct device *dev = &pdev->dev;
 841         struct fb_info *info;
 842         struct atmel_lcdfb_info *sinfo;
 843         struct atmel_lcdfb_info *pdata_sinfo;
 844         struct fb_videomode fbmode;
 845         struct resource *regs = NULL;
 846         struct resource *map = NULL;
 847         int ret;
 848
 849         dev_dbg(dev, "%s BEGIN\n", __func__);
 850
 851         ret = -ENOMEM;
 852         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
 853         if (!info) {
 854                 dev_err(dev, "cannot allocate memory\n");
 855                 goto out;
 856         }
 857
 858         sinfo = info->par;
 859
 860         if (dev->platform_data) {
 861                 pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data;
 862                 sinfo->default_bpp = pdata_sinfo->default_bpp;
 863                 sinfo->default_dmacon = pdata_sinfo->default_dmacon;
 864                 sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2;
 865                 sinfo->default_monspecs = pdata_sinfo->default_monspecs;
 866                 sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
 867                 sinfo->guard_time = pdata_sinfo->guard_time;
 868                 sinfo->smem_len = pdata_sinfo->smem_len;
 869                 sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
 870                 sinfo->lcdcon_pol_negative = pdata_sinfo->lcdcon_pol_negative;
 871                 sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
 872         } else {
 873                 dev_err(dev, "cannot get default configuration\n");
 874                 goto free_info;
 875         }
 876         sinfo->info = info;
 877         sinfo->pdev = pdev;
 878
 879         strcpy(info->fix.id, sinfo->pdev->name);
 880         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
 881         info->pseudo_palette = sinfo->pseudo_palette;
 882         info->fbops = &atmel_lcdfb_ops;
 883
 884         memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs));
 885         info->fix = atmel_lcdfb_fix;
 886
 887         /* Enable LCDC Clocks */
 888         if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()
 889          || cpu_is_at32ap7000()) {
 890                 sinfo->bus_clk = clk_get(dev, "hck1");
 891                 if (IS_ERR(sinfo->bus_clk)) {
 892                         ret = PTR_ERR(sinfo->bus_clk);
 893                         goto free_info;
 894                 }
 895         }
 896         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
 897         if (IS_ERR(sinfo->lcdc_clk)) {
 898                 ret = PTR_ERR(sinfo->lcdc_clk);
 899                 goto put_bus_clk;
 900         }
 901         atmel_lcdfb_start_clock(sinfo);
 902
 903         ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
 904                         info->monspecs.modedb_len, info->monspecs.modedb,
 905                         sinfo->default_bpp);
 906         if (!ret) {
 907                 dev_err(dev, "no suitable video mode found\n");
 908                 goto stop_clk;
 909         }
 910
 911
 912         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 913         if (!regs) {
 914                 dev_err(dev, "resources unusable\n");
 915                 ret = -ENXIO;
 916                 goto stop_clk;
 917         }
 918
 919         sinfo->irq_base = platform_get_irq(pdev, 0);
 920         if (sinfo->irq_base < 0) {
 921                 dev_err(dev, "unable to get irq\n");
 922                 ret = sinfo->irq_base;
 923                 goto stop_clk;
 924         }
 925
 926         /* Initialize video memory */
 927         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 928         if (map) {
 929                 /* use a pre-allocated memory buffer */
 930                 info->fix.smem_start = map->start;
 931                 info->fix.smem_len = resource_size(map);
 932                 if (!request_mem_region(info->fix.smem_start,
 933                                         info->fix.smem_len, pdev->name)) {
 934                         ret = -EBUSY;
 935                         goto stop_clk;
 936                 }
 937
 938                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 939                 if (!info->screen_base)
 940                         goto release_intmem;
 941
 942                 /*
 943                  * Don't clear the framebuffer -- someone may have set
 944                  * up a splash image.
 945                  */
 946         } else {
 947                 /* alocate memory buffer */
 948                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
 949                 if (ret < 0) {
 950                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
 951                         goto stop_clk;
 952                 }
 953         }
 954
 955         /* LCDC registers */
 956         info->fix.mmio_start = regs->start;
 957         info->fix.mmio_len = resource_size(regs);
 958
 959         if (!request_mem_region(info->fix.mmio_start,
 960                                 info->fix.mmio_len, pdev->name)) {
 961                 ret = -EBUSY;
 962                 goto free_fb;
 963         }
 964
 965         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
 966         if (!sinfo->mmio) {
 967                 dev_err(dev, "cannot map LCDC registers\n");
 968                 goto release_mem;
 969         }
 970
 971         /* Initialize PWM for contrast or backlight ("off") */
 972         init_contrast(sinfo);
 973
 974         /* interrupt */
 975         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
 976         if (ret) {
 977                 dev_err(dev, "request_irq failed: %d\n", ret);
 978                 goto unmap_mmio;
 979         }
 980
 981         /* Some operations on the LCDC might sleep and
 982          * require a preemptible task context */
 983         INIT_WORK(&sinfo->task, atmel_lcdfb_task);
 984
 985         ret = atmel_lcdfb_init_fbinfo(sinfo);
 986         if (ret < 0) {
 987                 dev_err(dev, "init fbinfo failed: %d\n", ret);
 988                 goto unregister_irqs;
 989         }
 990
 991         /*
 992          * This makes sure that our colour bitfield
 993          * descriptors are correctly initialised.
 994          */
 995         atmel_lcdfb_check_var(&info->var, info);
 996
 997         ret = fb_set_var(info, &info->var);
 998         if (ret) {
 999                 dev_warn(dev, "unable to set display parameters\n");
1000                 goto free_cmap;
1001         }
1002
1003         dev_set_drvdata(dev, info);
1004
1005         /*
1006          * Tell the world that we're ready to go
1007          */
1008         ret = register_framebuffer(info);
1009         if (ret < 0) {
1010                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
1011                 goto reset_drvdata;
1012         }
1013
1014         /* add selected videomode to modelist */
1015         fb_var_to_videomode(&fbmode, &info->var);
1016         fb_add_videomode(&fbmode, &info->modelist);
1017
1018         /* Power up the LCDC screen */
1019         if (sinfo->atmel_lcdfb_power_control)
1020                 sinfo->atmel_lcdfb_power_control(1);
1021
1022         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1023                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
1024
1025         return 0;
1026
1027 reset_drvdata:
1028         dev_set_drvdata(dev, NULL);
1029 free_cmap:
1030         fb_dealloc_cmap(&info->cmap);
1031 unregister_irqs:
1032         cancel_work_sync(&sinfo->task);
1033         free_irq(sinfo->irq_base, info);
1034 unmap_mmio:
1035         exit_backlight(sinfo);
1036         iounmap(sinfo->mmio);
1037 release_mem:
1038         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1039 free_fb:
1040         if (map)
1041                 iounmap(info->screen_base);
1042         else
1043                 atmel_lcdfb_free_video_memory(sinfo);
1044
1045 release_intmem:
1046         if (map)
1047                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1048 stop_clk:
1049         atmel_lcdfb_stop_clock(sinfo);
1050         clk_put(sinfo->lcdc_clk);
1051 put_bus_clk:
1052         if (sinfo->bus_clk)
1053                 clk_put(sinfo->bus_clk);
1054 free_info:
1055         framebuffer_release(info);
1056 out:
1057         dev_dbg(dev, "%s FAILED\n", __func__);
1058         return ret;
1059 }
1060
1061 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1062 {
1063         struct device *dev = &pdev->dev;
1064         struct fb_info *info = dev_get_drvdata(dev);
1065         struct atmel_lcdfb_info *sinfo;
1066
1067         if (!info || !info->par)
1068                 return 0;
1069         sinfo = info->par;
1070
1071         cancel_work_sync(&sinfo->task);
1072         exit_backlight(sinfo);
1073         if (sinfo->atmel_lcdfb_power_control)
1074                 sinfo->atmel_lcdfb_power_control(0);
1075         unregister_framebuffer(info);
1076         atmel_lcdfb_stop_clock(sinfo);
1077         clk_put(sinfo->lcdc_clk);
1078         if (sinfo->bus_clk)
1079                 clk_put(sinfo->bus_clk);
1080         fb_dealloc_cmap(&info->cmap);
1081         free_irq(sinfo->irq_base, info);
1082         iounmap(sinfo->mmio);
1083         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1084         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1085                 iounmap(info->screen_base);
1086                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1087         } else {
1088                 atmel_lcdfb_free_video_memory(sinfo);
1089         }
1090
1091         dev_set_drvdata(dev, NULL);
1092         framebuffer_release(info);
1093
1094         return 0;
1095 }
1096
1097 #ifdef CONFIG_PM
1098
1099 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1100 {
1101         struct fb_info *info = platform_get_drvdata(pdev);
1102         struct atmel_lcdfb_info *sinfo = info->par;
1103
1104         /*
1105          * We don't want to handle interrupts while the clock is
1106          * stopped. It may take forever.
1107          */
1108         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1109
1110         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
1111         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1112         if (sinfo->atmel_lcdfb_power_control)
1113                 sinfo->atmel_lcdfb_power_control(0);
1114
1115         atmel_lcdfb_stop(sinfo);
1116         atmel_lcdfb_stop_clock(sinfo);
1117
1118         return 0;
1119 }
1120
1121 static int atmel_lcdfb_resume(struct platform_device *pdev)
1122 {
1123         struct fb_info *info = platform_get_drvdata(pdev);
1124         struct atmel_lcdfb_info *sinfo = info->par;
1125
1126         atmel_lcdfb_start_clock(sinfo);
1127         atmel_lcdfb_start(sinfo);
1128         if (sinfo->atmel_lcdfb_power_control)
1129                 sinfo->atmel_lcdfb_power_control(1);
1130         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1131
1132         /* Enable FIFO & DMA errors */
1133         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1134                         | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1135
1136         return 0;
1137 }
1138
1139 #else
1140 #define atmel_lcdfb_suspend     NULL
1141 #define atmel_lcdfb_resume      NULL
1142 #endif
1143
1144 static struct platform_driver atmel_lcdfb_driver = {
1145         .remove         = __exit_p(atmel_lcdfb_remove),
1146         .suspend        = atmel_lcdfb_suspend,
1147         .resume         = atmel_lcdfb_resume,
1148
1149         .driver         = {
1150                 .name   = "atmel_lcdfb",
1151                 .owner  = THIS_MODULE,
1152         },
1153 };
1154
1155 static int __init atmel_lcdfb_init(void)
1156 {
1157         return platform_driver_probe(&atmel_lcdfb_driver, atmel_lcdfb_probe);
1158 }
1159
1160 static void __exit atmel_lcdfb_exit(void)
1161 {
1162         platform_driver_unregister(&atmel_lcdfb_driver);
1163 }
1164
1165 module_init(atmel_lcdfb_init);
1166 module_exit(atmel_lcdfb_exit);
1167
1168 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1169 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1170 MODULE_LICENSE("GPL");