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 #include <linux/module.h>
  22
  23 #include <mach/board.h>
  24 #include <mach/cpu.h>
  25 #include <asm/gpio.h>
  26
  27 #include <video/atmel_lcdc.h>
  28
  29 #define lcdc_readl(sinfo, reg)          __raw_readl((sinfo)->mmio+(reg))
  30 #define lcdc_writel(sinfo, reg, val)    __raw_writel((val), (sinfo)->mmio+(reg))
  31
  32 /* configurable parameters */
  33 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
  34 #define ATMEL_LCDC_DMA_BURST_LEN        8       /* words */
  35 #define ATMEL_LCDC_FIFO_SIZE            512     /* words */
  36
  37 #if defined(CONFIG_ARCH_AT91)
  38 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
  39                                          | FBINFO_PARTIAL_PAN_OK \
  40                                          | FBINFO_HWACCEL_YPAN)
  41
  42 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
  43                                         struct fb_var_screeninfo *var,
  44                                         struct fb_info *info)
  45 {
  46
  47 }
  48 #elif defined(CONFIG_AVR32)
  49 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
  50                                         | FBINFO_PARTIAL_PAN_OK \
  51                                         | FBINFO_HWACCEL_XPAN \
  52                                         | FBINFO_HWACCEL_YPAN)
  53
  54 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
  55                                      struct fb_var_screeninfo *var,
  56                                      struct fb_info *info)
  57 {
  58         u32 dma2dcfg;
  59         u32 pixeloff;
  60
  61         pixeloff = (var->xoffset * info->var.bits_per_pixel) & 0x1f;
  62
  63         dma2dcfg = (info->var.xres_virtual - info->var.xres)
  64                  * info->var.bits_per_pixel / 8;
  65         dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
  66         lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
  67
  68         /* Update configuration */
  69         lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
  70                     lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
  71                     | ATMEL_LCDC_DMAUPDT);
  72 }
  73 #endif
  74
  75 static u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
  76                 | ATMEL_LCDC_POL_POSITIVE
  77                 | ATMEL_LCDC_ENA_PWMENABLE;
  78
  79 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
  80
  81 /* some bl->props field just changed */
  82 static int atmel_bl_update_status(struct backlight_device *bl)
  83 {
  84         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
  85         int                     power = sinfo->bl_power;
  86         int                     brightness = bl->props.brightness;
  87
  88         /* REVISIT there may be a meaningful difference between
  89          * fb_blank and power ... there seem to be some cases
  90          * this doesn't handle correctly.
  91          */
  92         if (bl->props.fb_blank != sinfo->bl_power)
  93                 power = bl->props.fb_blank;
  94         else if (bl->props.power != sinfo->bl_power)
  95                 power = bl->props.power;
  96
  97         if (brightness < 0 && power == FB_BLANK_UNBLANK)
  98                 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
  99         else if (power != FB_BLANK_UNBLANK)
 100                 brightness = 0;
 101
 102         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
 103         if (contrast_ctr & ATMEL_LCDC_POL_POSITIVE)
 104                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
 105                         brightness ? contrast_ctr : 0);
 106         else
 107                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 108
 109         bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
 110
 111         return 0;
 112 }
 113
 114 static int atmel_bl_get_brightness(struct backlight_device *bl)
 115 {
 116         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 117
 118         return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 119 }
 120
 121 static const struct backlight_ops atmel_lcdc_bl_ops = {
 122         .update_status = atmel_bl_update_status,
 123         .get_brightness = atmel_bl_get_brightness,
 124 };
 125
 126 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 127 {
 128         struct backlight_properties props;
 129         struct backlight_device *bl;
 130
 131         sinfo->bl_power = FB_BLANK_UNBLANK;
 132
 133         if (sinfo->backlight)
 134                 return;
 135
 136         memset(&props, 0, sizeof(struct backlight_properties));
 137         props.type = BACKLIGHT_RAW;
 138         props.max_brightness = 0xff;
 139         bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo,
 140                                        &atmel_lcdc_bl_ops, &props);
 141         if (IS_ERR(bl)) {
 142                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
 143                                 PTR_ERR(bl));
 144                 return;
 145         }
 146         sinfo->backlight = bl;
 147
 148         bl->props.power = FB_BLANK_UNBLANK;
 149         bl->props.fb_blank = FB_BLANK_UNBLANK;
 150         bl->props.brightness = atmel_bl_get_brightness(bl);
 151 }
 152
 153 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 154 {
 155         if (sinfo->backlight)
 156                 backlight_device_unregister(sinfo->backlight);
 157 }
 158
 159 #else
 160
 161 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 162 {
 163         dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
 164 }
 165
 166 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 167 {
 168 }
 169
 170 #endif
 171
 172 static void init_contrast(struct atmel_lcdfb_info *sinfo)
 173 {
 174         /* contrast pwm can be 'inverted' */
 175         if (sinfo->lcdcon_pol_negative)
 176                         contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
 177
 178         /* have some default contrast/backlight settings */
 179         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 180         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 181
 182         if (sinfo->lcdcon_is_backlight)
 183                 init_backlight(sinfo);
 184 }
 185
 186
 187 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
 188         .type           = FB_TYPE_PACKED_PIXELS,
 189         .visual         = FB_VISUAL_TRUECOLOR,
 190         .xpanstep       = 0,
 191         .ypanstep       = 1,
 192         .ywrapstep      = 0,
 193         .accel          = FB_ACCEL_NONE,
 194 };
 195
 196 static unsigned long compute_hozval(unsigned long xres, unsigned long lcdcon2)
 197 {
 198         unsigned long value;
 199
 200         if (!(cpu_is_at91sam9261() || cpu_is_at91sam9g10()
 201                 || cpu_is_at32ap7000()))
 202                 return xres;
 203
 204         value = xres;
 205         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
 206                 /* STN display */
 207                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
 208                         value *= 3;
 209                 }
 210                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
 211                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
 212                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
 213                         value = DIV_ROUND_UP(value, 4);
 214                 else
 215                         value = DIV_ROUND_UP(value, 8);
 216         }
 217
 218         return value;
 219 }
 220
 221 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
 222 {
 223         /* Turn off the LCD controller and the DMA controller */
 224         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 225                         sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
 226
 227         /* Wait for the LCDC core to become idle */
 228         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 229                 msleep(10);
 230
 231         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
 232 }
 233
 234 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
 235 {
 236         atmel_lcdfb_stop_nowait(sinfo);
 237
 238         /* Wait for DMA engine to become idle... */
 239         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 240                 msleep(10);
 241 }
 242
 243 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
 244 {
 245         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon);
 246         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 247                 (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
 248                 | ATMEL_LCDC_PWR);
 249 }
 250
 251 static void atmel_lcdfb_update_dma(struct fb_info *info,
 252                                struct fb_var_screeninfo *var)
 253 {
 254         struct atmel_lcdfb_info *sinfo = info->par;
 255         struct fb_fix_screeninfo *fix = &info->fix;
 256         unsigned long dma_addr;
 257
 258         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
 259                     + var->xoffset * info->var.bits_per_pixel / 8);
 260
 261         dma_addr &= ~3UL;
 262
 263         /* Set framebuffer DMA base address and pixel offset */
 264         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
 265
 266         atmel_lcdfb_update_dma2d(sinfo, var, info);
 267 }
 268
 269 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
 270 {
 271         struct fb_info *info = sinfo->info;
 272
 273         dma_free_writecombine(info->device, info->fix.smem_len,
 274                                 info->screen_base, info->fix.smem_start);
 275 }
 276
 277 /**
 278  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
 279  *      @sinfo: the frame buffer to allocate memory for
 280  *
 281  *      This function is called only from the atmel_lcdfb_probe()
 282  *      so no locking by fb_info->mm_lock around smem_len setting is needed.
 283  */
 284 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
 285 {
 286         struct fb_info *info = sinfo->info;
 287         struct fb_var_screeninfo *var = &info->var;
 288         unsigned int smem_len;
 289
 290         smem_len = (var->xres_virtual * var->yres_virtual
 291                     * ((var->bits_per_pixel + 7) / 8));
 292         info->fix.smem_len = max(smem_len, sinfo->smem_len);
 293
 294         info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
 295                                         (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
 296
 297         if (!info->screen_base) {
 298                 return -ENOMEM;
 299         }
 300
 301         memset(info->screen_base, 0, info->fix.smem_len);
 302
 303         return 0;
 304 }
 305
 306 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
 307                                                      struct fb_info *info)
 308 {
 309         struct fb_videomode varfbmode;
 310         const struct fb_videomode *fbmode = NULL;
 311
 312         fb_var_to_videomode(&varfbmode, var);
 313         fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
 314         if (fbmode)
 315                 fb_videomode_to_var(var, fbmode);
 316         return fbmode;
 317 }
 318
 319
 320 /**
 321  *      atmel_lcdfb_check_var - Validates a var passed in.
 322  *      @var: frame buffer variable screen structure
 323  *      @info: frame buffer structure that represents a single frame buffer
 324  *
 325  *      Checks to see if the hardware supports the state requested by
 326  *      var passed in. This function does not alter the hardware
 327  *      state!!!  This means the data stored in struct fb_info and
 328  *      struct atmel_lcdfb_info do not change. This includes the var
 329  *      inside of struct fb_info.  Do NOT change these. This function
 330  *      can be called on its own if we intent to only test a mode and
 331  *      not actually set it. The stuff in modedb.c is a example of
 332  *      this. If the var passed in is slightly off by what the
 333  *      hardware can support then we alter the var PASSED in to what
 334  *      we can do. If the hardware doesn't support mode change a
 335  *      -EINVAL will be returned by the upper layers. You don't need
 336  *      to implement this function then. If you hardware doesn't
 337  *      support changing the resolution then this function is not
 338  *      needed. In this case the driver would just provide a var that
 339  *      represents the static state the screen is in.
 340  *
 341  *      Returns negative errno on error, or zero on success.
 342  */
 343 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
 344                              struct fb_info *info)
 345 {
 346         struct device *dev = info->device;
 347         struct atmel_lcdfb_info *sinfo = info->par;
 348         unsigned long clk_value_khz;
 349
 350         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 351
 352         dev_dbg(dev, "%s:\n", __func__);
 353
 354         if (!(var->pixclock && var->bits_per_pixel)) {
 355                 /* choose a suitable mode if possible */
 356                 if (!atmel_lcdfb_choose_mode(var, info)) {
 357                         dev_err(dev, "needed value not specified\n");
 358                         return -EINVAL;
 359                 }
 360         }
 361
 362         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
 363         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
 364         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
 365         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
 366
 367         if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
 368                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
 369                 return -EINVAL;
 370         }
 371
 372         /* Do not allow to have real resoulution larger than virtual */
 373         if (var->xres > var->xres_virtual)
 374                 var->xres_virtual = var->xres;
 375
 376         if (var->yres > var->yres_virtual)
 377                 var->yres_virtual = var->yres;
 378
 379         /* Force same alignment for each line */
 380         var->xres = (var->xres + 3) & ~3UL;
 381         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
 382
 383         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
 384         var->transp.msb_right = 0;
 385         var->transp.offset = var->transp.length = 0;
 386         var->xoffset = var->yoffset = 0;
 387
 388         if (info->fix.smem_len) {
 389                 unsigned int smem_len = (var->xres_virtual * var->yres_virtual
 390                                          * ((var->bits_per_pixel + 7) / 8));
 391                 if (smem_len > info->fix.smem_len)
 392                         return -EINVAL;
 393         }
 394
 395         /* Saturate vertical and horizontal timings at maximum values */
 396         var->vsync_len = min_t(u32, var->vsync_len,
 397                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
 398         var->upper_margin = min_t(u32, var->upper_margin,
 399                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
 400         var->lower_margin = min_t(u32, var->lower_margin,
 401                         ATMEL_LCDC_VFP);
 402         var->right_margin = min_t(u32, var->right_margin,
 403                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
 404         var->hsync_len = min_t(u32, var->hsync_len,
 405                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
 406         var->left_margin = min_t(u32, var->left_margin,
 407                         ATMEL_LCDC_HBP + 1);
 408
 409         /* Some parameters can't be zero */
 410         var->vsync_len = max_t(u32, var->vsync_len, 1);
 411         var->right_margin = max_t(u32, var->right_margin, 1);
 412         var->hsync_len = max_t(u32, var->hsync_len, 1);
 413         var->left_margin = max_t(u32, var->left_margin, 1);
 414
 415         switch (var->bits_per_pixel) {
 416         case 1:
 417         case 2:
 418         case 4:
 419         case 8:
 420                 var->red.offset = var->green.offset = var->blue.offset = 0;
 421                 var->red.length = var->green.length = var->blue.length
 422                         = var->bits_per_pixel;
 423                 break;
 424         case 15:
 425         case 16:
 426                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 427                         /* RGB:565 mode */
 428                         var->red.offset = 11;
 429                         var->blue.offset = 0;
 430                         var->green.length = 6;
 431                 } else if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB555) {
 432                         var->red.offset = 10;
 433                         var->blue.offset = 0;
 434                         var->green.length = 5;
 435                 } else {
 436                         /* BGR:555 mode */
 437                         var->red.offset = 0;
 438                         var->blue.offset = 10;
 439                         var->green.length = 5;
 440                 }
 441                 var->green.offset = 5;
 442                 var->red.length = var->blue.length = 5;
 443                 break;
 444         case 32:
 445                 var->transp.offset = 24;
 446                 var->transp.length = 8;
 447                 /* fall through */
 448         case 24:
 449                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 450                         /* RGB:888 mode */
 451                         var->red.offset = 16;
 452                         var->blue.offset = 0;
 453                 } else {
 454                         /* BGR:888 mode */
 455                         var->red.offset = 0;
 456                         var->blue.offset = 16;
 457                 }
 458                 var->green.offset = 8;
 459                 var->red.length = var->green.length = var->blue.length = 8;
 460                 break;
 461         default:
 462                 dev_err(dev, "color depth %d not supported\n",
 463                                         var->bits_per_pixel);
 464                 return -EINVAL;
 465         }
 466
 467         return 0;
 468 }
 469
 470 /*
 471  * LCD reset sequence
 472  */
 473 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
 474 {
 475         might_sleep();
 476
 477         atmel_lcdfb_stop(sinfo);
 478         atmel_lcdfb_start(sinfo);
 479 }
 480
 481 /**
 482  *      atmel_lcdfb_set_par - Alters the hardware state.
 483  *      @info: frame buffer structure that represents a single frame buffer
 484  *
 485  *      Using the fb_var_screeninfo in fb_info we set the resolution
 486  *      of the this particular framebuffer. This function alters the
 487  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
 488  *      not alter var in fb_info since we are using that data. This
 489  *      means we depend on the data in var inside fb_info to be
 490  *      supported by the hardware.  atmel_lcdfb_check_var is always called
 491  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
 492  *      change the resolution you don't need this function.
 493  *
 494  */
 495 static int atmel_lcdfb_set_par(struct fb_info *info)
 496 {
 497         struct atmel_lcdfb_info *sinfo = info->par;
 498         unsigned long hozval_linesz;
 499         unsigned long value;
 500         unsigned long clk_value_khz;
 501         unsigned long bits_per_line;
 502         unsigned long pix_factor = 2;
 503
 504         might_sleep();
 505
 506         dev_dbg(info->device, "%s:\n", __func__);
 507         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
 508                  info->var.xres, info->var.yres,
 509                  info->var.xres_virtual, info->var.yres_virtual);
 510
 511         atmel_lcdfb_stop_nowait(sinfo);
 512
 513         if (info->var.bits_per_pixel == 1)
 514                 info->fix.visual = FB_VISUAL_MONO01;
 515         else if (info->var.bits_per_pixel <= 8)
 516                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 517         else
 518                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 519
 520         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
 521         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
 522
 523         /* Re-initialize the DMA engine... */
 524         dev_dbg(info->device, "  * update DMA engine\n");
 525         atmel_lcdfb_update_dma(info, &info->var);
 526
 527         /* ...set frame size and burst length = 8 words (?) */
 528         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
 529         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 530         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
 531
 532         /* Now, the LCDC core... */
 533
 534         /* Set pixel clock */
 535         if (cpu_is_at91sam9g45() && !cpu_is_at91sam9g45es())
 536                 pix_factor = 1;
 537
 538         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 539
 540         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
 541
 542         if (value < pix_factor) {
 543                 dev_notice(info->device, "Bypassing pixel clock divider\n");
 544                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 545         } else {
 546                 value = (value / pix_factor) - 1;
 547                 dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
 548                                 value);
 549                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
 550                                 value << ATMEL_LCDC_CLKVAL_OFFSET);
 551                 info->var.pixclock =
 552                         KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1)));
 553                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
 554                                         PICOS2KHZ(info->var.pixclock));
 555         }
 556
 557
 558         /* Initialize control register 2 */
 559         value = sinfo->default_lcdcon2;
 560
 561         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
 562                 value |= ATMEL_LCDC_INVLINE_INVERTED;
 563         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
 564                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
 565
 566         switch (info->var.bits_per_pixel) {
 567                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
 568                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
 569                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
 570                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
 571                 case 15: /* fall through */
 572                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
 573                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
 574                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
 575                 default: BUG(); break;
 576         }
 577         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
 578         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
 579
 580         /* Vertical timing */
 581         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 582         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
 583         value |= info->var.lower_margin;
 584         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
 585         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
 586
 587         /* Horizontal timing */
 588         value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 589         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 590         value |= (info->var.left_margin - 1);
 591         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
 592         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
 593
 594         /* Horizontal value (aka line size) */
 595         hozval_linesz = compute_hozval(info->var.xres,
 596                                         lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2));
 597
 598         /* Display size */
 599         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 600         value |= info->var.yres - 1;
 601         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
 602         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
 603
 604         /* FIFO Threshold: Use formula from data sheet */
 605         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 606         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
 607
 608         /* Toggle LCD_MODE every frame */
 609         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
 610
 611         /* Disable all interrupts */
 612         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
 613         /* Enable FIFO & DMA errors */
 614         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
 615
 616         /* ...wait for DMA engine to become idle... */
 617         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 618                 msleep(10);
 619
 620         atmel_lcdfb_start(sinfo);
 621
 622         dev_dbg(info->device, "  * DONE\n");
 623
 624         return 0;
 625 }
 626
 627 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
 628 {
 629         chan &= 0xffff;
 630         chan >>= 16 - bf->length;
 631         return chan << bf->offset;
 632 }
 633
 634 /**
 635  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
 636  *      @regno: Which register in the CLUT we are programming
 637  *      @red: The red value which can be up to 16 bits wide
 638  *      @green: The green value which can be up to 16 bits wide
 639  *      @blue:  The blue value which can be up to 16 bits wide.
 640  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 641  *      @info: frame buffer info structure
 642  *
 643  *      Set a single color register. The values supplied have a 16 bit
 644  *      magnitude which needs to be scaled in this function for the hardware.
 645  *      Things to take into consideration are how many color registers, if
 646  *      any, are supported with the current color visual. With truecolor mode
 647  *      no color palettes are supported. Here a pseudo palette is created
 648  *      which we store the value in pseudo_palette in struct fb_info. For
 649  *      pseudocolor mode we have a limited color palette. To deal with this
 650  *      we can program what color is displayed for a particular pixel value.
 651  *      DirectColor is similar in that we can program each color field. If
 652  *      we have a static colormap we don't need to implement this function.
 653  *
 654  *      Returns negative errno on error, or zero on success. In an
 655  *      ideal world, this would have been the case, but as it turns
 656  *      out, the other drivers return 1 on failure, so that's what
 657  *      we're going to do.
 658  */
 659 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
 660                              unsigned int green, unsigned int blue,
 661                              unsigned int transp, struct fb_info *info)
 662 {
 663         struct atmel_lcdfb_info *sinfo = info->par;
 664         unsigned int val;
 665         u32 *pal;
 666         int ret = 1;
 667
 668         if (info->var.grayscale)
 669                 red = green = blue = (19595 * red + 38470 * green
 670                                       + 7471 * blue) >> 16;
 671
 672         switch (info->fix.visual) {
 673         case FB_VISUAL_TRUECOLOR:
 674                 if (regno < 16) {
 675                         pal = info->pseudo_palette;
 676
 677                         val  = chan_to_field(red, &info->var.red);
 678                         val |= chan_to_field(green, &info->var.green);
 679                         val |= chan_to_field(blue, &info->var.blue);
 680
 681                         pal[regno] = val;
 682                         ret = 0;
 683                 }
 684                 break;
 685
 686         case FB_VISUAL_PSEUDOCOLOR:
 687                 if (regno < 256) {
 688                         if (cpu_is_at91sam9261() || cpu_is_at91sam9263()
 689                             || cpu_is_at91sam9rl()) {
 690                                 /* old style I+BGR:555 */
 691                                 val  = ((red   >> 11) & 0x001f);
 692                                 val |= ((green >>  6) & 0x03e0);
 693                                 val |= ((blue  >>  1) & 0x7c00);
 694
 695                                 /*
 696                                  * TODO: intensity bit. Maybe something like
 697                                  *   ~(red[10] ^ green[10] ^ blue[10]) & 1
 698                                  */
 699                         } else {
 700                                 /* new style BGR:565 / RGB:565 */
 701                                 if (sinfo->lcd_wiring_mode ==
 702                                     ATMEL_LCDC_WIRING_RGB) {
 703                                         val  = ((blue >> 11) & 0x001f);
 704                                         val |= ((red  >>  0) & 0xf800);
 705                                 } else {
 706                                         val  = ((red  >> 11) & 0x001f);
 707                                         val |= ((blue >>  0) & 0xf800);
 708                                 }
 709
 710                                 val |= ((green >>  5) & 0x07e0);
 711                         }
 712
 713                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 714                         ret = 0;
 715                 }
 716                 break;
 717
 718         case FB_VISUAL_MONO01:
 719                 if (regno < 2) {
 720                         val = (regno == 0) ? 0x00 : 0x1F;
 721                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 722                         ret = 0;
 723                 }
 724                 break;
 725
 726         }
 727
 728         return ret;
 729 }
 730
 731 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
 732                                struct fb_info *info)
 733 {
 734         dev_dbg(info->device, "%s\n", __func__);
 735
 736         atmel_lcdfb_update_dma(info, var);
 737
 738         return 0;
 739 }
 740
 741 static int atmel_lcdfb_blank(int blank_mode, struct fb_info *info)
 742 {
 743         struct atmel_lcdfb_info *sinfo = info->par;
 744
 745         switch (blank_mode) {
 746         case FB_BLANK_UNBLANK:
 747         case FB_BLANK_NORMAL:
 748                 atmel_lcdfb_start(sinfo);
 749                 break;
 750         case FB_BLANK_VSYNC_SUSPEND:
 751         case FB_BLANK_HSYNC_SUSPEND:
 752                 break;
 753         case FB_BLANK_POWERDOWN:
 754                 atmel_lcdfb_stop(sinfo);
 755                 break;
 756         default:
 757                 return -EINVAL;
 758         }
 759
 760         /* let fbcon do a soft blank for us */
 761         return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
 762 }
 763
 764 static struct fb_ops atmel_lcdfb_ops = {
 765         .owner          = THIS_MODULE,
 766         .fb_check_var   = atmel_lcdfb_check_var,
 767         .fb_set_par     = atmel_lcdfb_set_par,
 768         .fb_setcolreg   = atmel_lcdfb_setcolreg,
 769         .fb_blank       = atmel_lcdfb_blank,
 770         .fb_pan_display = atmel_lcdfb_pan_display,
 771         .fb_fillrect    = cfb_fillrect,
 772         .fb_copyarea    = cfb_copyarea,
 773         .fb_imageblit   = cfb_imageblit,
 774 };
 775
 776 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
 777 {
 778         struct fb_info *info = dev_id;
 779         struct atmel_lcdfb_info *sinfo = info->par;
 780         u32 status;
 781
 782         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
 783         if (status & ATMEL_LCDC_UFLWI) {
 784                 dev_warn(info->device, "FIFO underflow %#x\n", status);
 785                 /* reset DMA and FIFO to avoid screen shifting */
 786                 schedule_work(&sinfo->task);
 787         }
 788         lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
 789         return IRQ_HANDLED;
 790 }
 791
 792 /*
 793  * LCD controller task (to reset the LCD)
 794  */
 795 static void atmel_lcdfb_task(struct work_struct *work)
 796 {
 797         struct atmel_lcdfb_info *sinfo =
 798                 container_of(work, struct atmel_lcdfb_info, task);
 799
 800         atmel_lcdfb_reset(sinfo);
 801 }
 802
 803 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
 804 {
 805         struct fb_info *info = sinfo->info;
 806         int ret = 0;
 807
 808         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
 809
 810         dev_info(info->device,
 811                "%luKiB frame buffer at %08lx (mapped at %p)\n",
 812                (unsigned long)info->fix.smem_len / 1024,
 813                (unsigned long)info->fix.smem_start,
 814                info->screen_base);
 815
 816         /* Allocate colormap */
 817         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 818         if (ret < 0)
 819                 dev_err(info->device, "Alloc color map failed\n");
 820
 821         return ret;
 822 }
 823
 824 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
 825 {
 826         if (sinfo->bus_clk)
 827                 clk_enable(sinfo->bus_clk);
 828         clk_enable(sinfo->lcdc_clk);
 829 }
 830
 831 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
 832 {
 833         if (sinfo->bus_clk)
 834                 clk_disable(sinfo->bus_clk);
 835         clk_disable(sinfo->lcdc_clk);
 836 }
 837
 838
 839 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
 840 {
 841         struct device *dev = &pdev->dev;
 842         struct fb_info *info;
 843         struct atmel_lcdfb_info *sinfo;
 844         struct atmel_lcdfb_info *pdata_sinfo;
 845         struct fb_videomode fbmode;
 846         struct resource *regs = NULL;
 847         struct resource *map = NULL;
 848         int ret;
 849
 850         dev_dbg(dev, "%s BEGIN\n", __func__);
 851
 852         ret = -ENOMEM;
 853         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
 854         if (!info) {
 855                 dev_err(dev, "cannot allocate memory\n");
 856                 goto out;
 857         }
 858
 859         sinfo = info->par;
 860
 861         if (dev->platform_data) {
 862                 pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data;
 863                 sinfo->default_bpp = pdata_sinfo->default_bpp;
 864                 sinfo->default_dmacon = pdata_sinfo->default_dmacon;
 865                 sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2;
 866                 sinfo->default_monspecs = pdata_sinfo->default_monspecs;
 867                 sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
 868                 sinfo->guard_time = pdata_sinfo->guard_time;
 869                 sinfo->smem_len = pdata_sinfo->smem_len;
 870                 sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
 871                 sinfo->lcdcon_pol_negative = pdata_sinfo->lcdcon_pol_negative;
 872                 sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
 873         } else {
 874                 dev_err(dev, "cannot get default configuration\n");
 875                 goto free_info;
 876         }
 877         sinfo->info = info;
 878         sinfo->pdev = pdev;
 879
 880         strcpy(info->fix.id, sinfo->pdev->name);
 881         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
 882         info->pseudo_palette = sinfo->pseudo_palette;
 883         info->fbops = &atmel_lcdfb_ops;
 884
 885         memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs));
 886         info->fix = atmel_lcdfb_fix;
 887
 888         /* Enable LCDC Clocks */
 889         if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()
 890          || cpu_is_at32ap7000()) {
 891                 sinfo->bus_clk = clk_get(dev, "hck1");
 892                 if (IS_ERR(sinfo->bus_clk)) {
 893                         ret = PTR_ERR(sinfo->bus_clk);
 894                         goto free_info;
 895                 }
 896         }
 897         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
 898         if (IS_ERR(sinfo->lcdc_clk)) {
 899                 ret = PTR_ERR(sinfo->lcdc_clk);
 900                 goto put_bus_clk;
 901         }
 902         atmel_lcdfb_start_clock(sinfo);
 903
 904         ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
 905                         info->monspecs.modedb_len, info->monspecs.modedb,
 906                         sinfo->default_bpp);
 907         if (!ret) {
 908                 dev_err(dev, "no suitable video mode found\n");
 909                 goto stop_clk;
 910         }
 911
 912
 913         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 914         if (!regs) {
 915                 dev_err(dev, "resources unusable\n");
 916                 ret = -ENXIO;
 917                 goto stop_clk;
 918         }
 919
 920         sinfo->irq_base = platform_get_irq(pdev, 0);
 921         if (sinfo->irq_base < 0) {
 922                 dev_err(dev, "unable to get irq\n");
 923                 ret = sinfo->irq_base;
 924                 goto stop_clk;
 925         }
 926
 927         /* Initialize video memory */
 928         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 929         if (map) {
 930                 /* use a pre-allocated memory buffer */
 931                 info->fix.smem_start = map->start;
 932                 info->fix.smem_len = resource_size(map);
 933                 if (!request_mem_region(info->fix.smem_start,
 934                                         info->fix.smem_len, pdev->name)) {
 935                         ret = -EBUSY;
 936                         goto stop_clk;
 937                 }
 938
 939                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 940                 if (!info->screen_base)
 941                         goto release_intmem;
 942
 943                 /*
 944                  * Don't clear the framebuffer -- someone may have set
 945                  * up a splash image.
 946                  */
 947         } else {
 948                 /* alocate memory buffer */
 949                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
 950                 if (ret < 0) {
 951                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
 952                         goto stop_clk;
 953                 }
 954         }
 955
 956         /* LCDC registers */
 957         info->fix.mmio_start = regs->start;
 958         info->fix.mmio_len = resource_size(regs);
 959
 960         if (!request_mem_region(info->fix.mmio_start,
 961                                 info->fix.mmio_len, pdev->name)) {
 962                 ret = -EBUSY;
 963                 goto free_fb;
 964         }
 965
 966         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
 967         if (!sinfo->mmio) {
 968                 dev_err(dev, "cannot map LCDC registers\n");
 969                 goto release_mem;
 970         }
 971
 972         /* Initialize PWM for contrast or backlight ("off") */
 973         init_contrast(sinfo);
 974
 975         /* interrupt */
 976         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
 977         if (ret) {
 978                 dev_err(dev, "request_irq failed: %d\n", ret);
 979                 goto unmap_mmio;
 980         }
 981
 982         /* Some operations on the LCDC might sleep and
 983          * require a preemptible task context */
 984         INIT_WORK(&sinfo->task, atmel_lcdfb_task);
 985
 986         ret = atmel_lcdfb_init_fbinfo(sinfo);
 987         if (ret < 0) {
 988                 dev_err(dev, "init fbinfo failed: %d\n", ret);
 989                 goto unregister_irqs;
 990         }
 991
 992         /*
 993          * This makes sure that our colour bitfield
 994          * descriptors are correctly initialised.
 995          */
 996         atmel_lcdfb_check_var(&info->var, info);
 997
 998         ret = fb_set_var(info, &info->var);
 999         if (ret) {
1000                 dev_warn(dev, "unable to set display parameters\n");
1001                 goto free_cmap;
1002         }
1003
1004         dev_set_drvdata(dev, info);
1005
1006         /*
1007          * Tell the world that we're ready to go
1008          */
1009         ret = register_framebuffer(info);
1010         if (ret < 0) {
1011                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
1012                 goto reset_drvdata;
1013         }
1014
1015         /* add selected videomode to modelist */
1016         fb_var_to_videomode(&fbmode, &info->var);
1017         fb_add_videomode(&fbmode, &info->modelist);
1018
1019         /* Power up the LCDC screen */
1020         if (sinfo->atmel_lcdfb_power_control)
1021                 sinfo->atmel_lcdfb_power_control(1);
1022
1023         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1024                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
1025
1026         return 0;
1027
1028 reset_drvdata:
1029         dev_set_drvdata(dev, NULL);
1030 free_cmap:
1031         fb_dealloc_cmap(&info->cmap);
1032 unregister_irqs:
1033         cancel_work_sync(&sinfo->task);
1034         free_irq(sinfo->irq_base, info);
1035 unmap_mmio:
1036         exit_backlight(sinfo);
1037         iounmap(sinfo->mmio);
1038 release_mem:
1039         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1040 free_fb:
1041         if (map)
1042                 iounmap(info->screen_base);
1043         else
1044                 atmel_lcdfb_free_video_memory(sinfo);
1045
1046 release_intmem:
1047         if (map)
1048                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1049 stop_clk:
1050         atmel_lcdfb_stop_clock(sinfo);
1051         clk_put(sinfo->lcdc_clk);
1052 put_bus_clk:
1053         if (sinfo->bus_clk)
1054                 clk_put(sinfo->bus_clk);
1055 free_info:
1056         framebuffer_release(info);
1057 out:
1058         dev_dbg(dev, "%s FAILED\n", __func__);
1059         return ret;
1060 }
1061
1062 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1063 {
1064         struct device *dev = &pdev->dev;
1065         struct fb_info *info = dev_get_drvdata(dev);
1066         struct atmel_lcdfb_info *sinfo;
1067
1068         if (!info || !info->par)
1069                 return 0;
1070         sinfo = info->par;
1071
1072         cancel_work_sync(&sinfo->task);
1073         exit_backlight(sinfo);
1074         if (sinfo->atmel_lcdfb_power_control)
1075                 sinfo->atmel_lcdfb_power_control(0);
1076         unregister_framebuffer(info);
1077         atmel_lcdfb_stop_clock(sinfo);
1078         clk_put(sinfo->lcdc_clk);
1079         if (sinfo->bus_clk)
1080                 clk_put(sinfo->bus_clk);
1081         fb_dealloc_cmap(&info->cmap);
1082         free_irq(sinfo->irq_base, info);
1083         iounmap(sinfo->mmio);
1084         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1085         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1086                 iounmap(info->screen_base);
1087                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1088         } else {
1089                 atmel_lcdfb_free_video_memory(sinfo);
1090         }
1091
1092         dev_set_drvdata(dev, NULL);
1093         framebuffer_release(info);
1094
1095         return 0;
1096 }
1097
1098 #ifdef CONFIG_PM
1099
1100 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1101 {
1102         struct fb_info *info = platform_get_drvdata(pdev);
1103         struct atmel_lcdfb_info *sinfo = info->par;
1104
1105         /*
1106          * We don't want to handle interrupts while the clock is
1107          * stopped. It may take forever.
1108          */
1109         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1110
1111         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_CTR);
1112         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1113         if (sinfo->atmel_lcdfb_power_control)
1114                 sinfo->atmel_lcdfb_power_control(0);
1115
1116         atmel_lcdfb_stop(sinfo);
1117         atmel_lcdfb_stop_clock(sinfo);
1118
1119         return 0;
1120 }
1121
1122 static int atmel_lcdfb_resume(struct platform_device *pdev)
1123 {
1124         struct fb_info *info = platform_get_drvdata(pdev);
1125         struct atmel_lcdfb_info *sinfo = info->par;
1126
1127         atmel_lcdfb_start_clock(sinfo);
1128         atmel_lcdfb_start(sinfo);
1129         if (sinfo->atmel_lcdfb_power_control)
1130                 sinfo->atmel_lcdfb_power_control(1);
1131         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1132
1133         /* Enable FIFO & DMA errors */
1134         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1135                         | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1136
1137         return 0;
1138 }
1139
1140 #else
1141 #define atmel_lcdfb_suspend     NULL
1142 #define atmel_lcdfb_resume      NULL
1143 #endif
1144
1145 static struct platform_driver atmel_lcdfb_driver = {
1146         .remove         = __exit_p(atmel_lcdfb_remove),
1147         .suspend        = atmel_lcdfb_suspend,
1148         .resume         = atmel_lcdfb_resume,
1149
1150         .driver         = {
1151                 .name   = "atmel_lcdfb",
1152                 .owner  = THIS_MODULE,
1153         },
1154 };
1155
1156 static int __init atmel_lcdfb_init(void)
1157 {
1158         return platform_driver_probe(&atmel_lcdfb_driver, atmel_lcdfb_probe);
1159 }
1160
1161 static void __exit atmel_lcdfb_exit(void)
1162 {
1163         platform_driver_unregister(&atmel_lcdfb_driver);
1164 }
1165
1166 module_init(atmel_lcdfb_init);
1167 module_exit(atmel_lcdfb_exit);
1168
1169 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1170 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1171 MODULE_LICENSE("GPL");