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