linux/drivers/video/atmel_lcdfb.c
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   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
  42static 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
  54static 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
  75static 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 */
  82static 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
 114static 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
 121static const struct backlight_ops atmel_lcdc_bl_ops = {
 122        .update_status = atmel_bl_update_status,
 123        .get_brightness = atmel_bl_get_brightness,
 124};
 125
 126static 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
 153static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 154{
 155        if (sinfo->backlight)
 156                backlight_device_unregister(sinfo->backlight);
 157}
 158
 159#else
 160
 161static void init_backlight(struct atmel_lcdfb_info *sinfo)
 162{
 163        dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
 164}
 165
 166static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 167{
 168}
 169
 170#endif
 171
 172static 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
 187static 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
 196static 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
 221static 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
 234static 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
 243static 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
 251static 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
 269static 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 */
 284static 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
 306static 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 */
 343static 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 16:
 425                if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 426                        /* RGB:565 mode */
 427                        var->red.offset = 11;
 428                        var->blue.offset = 0;
 429                } else {
 430                        /* BGR:565 mode */
 431                        var->red.offset = 0;
 432                        var->blue.offset = 11;
 433                }
 434                var->green.offset = 5;
 435                var->green.length = 6;
 436                var->red.length = var->blue.length = 5;
 437                break;
 438        case 32:
 439                var->transp.offset = 24;
 440                var->transp.length = 8;
 441                /* fall through */
 442        case 24:
 443                if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 444                        /* RGB:888 mode */
 445                        var->red.offset = 16;
 446                        var->blue.offset = 0;
 447                } else {
 448                        /* BGR:888 mode */
 449                        var->red.offset = 0;
 450                        var->blue.offset = 16;
 451                }
 452                var->green.offset = 8;
 453                var->red.length = var->green.length = var->blue.length = 8;
 454                break;
 455        default:
 456                dev_err(dev, "color depth %d not supported\n",
 457                                        var->bits_per_pixel);
 458                return -EINVAL;
 459        }
 460
 461        return 0;
 462}
 463
 464/*
 465 * LCD reset sequence
 466 */
 467static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
 468{
 469        might_sleep();
 470
 471        atmel_lcdfb_stop(sinfo);
 472        atmel_lcdfb_start(sinfo);
 473}
 474
 475/**
 476 *      atmel_lcdfb_set_par - Alters the hardware state.
 477 *      @info: frame buffer structure that represents a single frame buffer
 478 *
 479 *      Using the fb_var_screeninfo in fb_info we set the resolution
 480 *      of the this particular framebuffer. This function alters the
 481 *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
 482 *      not alter var in fb_info since we are using that data. This
 483 *      means we depend on the data in var inside fb_info to be
 484 *      supported by the hardware.  atmel_lcdfb_check_var is always called
 485 *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
 486 *      change the resolution you don't need this function.
 487 *
 488 */
 489static int atmel_lcdfb_set_par(struct fb_info *info)
 490{
 491        struct atmel_lcdfb_info *sinfo = info->par;
 492        unsigned long hozval_linesz;
 493        unsigned long value;
 494        unsigned long clk_value_khz;
 495        unsigned long bits_per_line;
 496        unsigned long pix_factor = 2;
 497
 498        might_sleep();
 499
 500        dev_dbg(info->device, "%s:\n", __func__);
 501        dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
 502                 info->var.xres, info->var.yres,
 503                 info->var.xres_virtual, info->var.yres_virtual);
 504
 505        atmel_lcdfb_stop_nowait(sinfo);
 506
 507        if (info->var.bits_per_pixel == 1)
 508                info->fix.visual = FB_VISUAL_MONO01;
 509        else if (info->var.bits_per_pixel <= 8)
 510                info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 511        else
 512                info->fix.visual = FB_VISUAL_TRUECOLOR;
 513
 514        bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
 515        info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
 516
 517        /* Re-initialize the DMA engine... */
 518        dev_dbg(info->device, "  * update DMA engine\n");
 519        atmel_lcdfb_update_dma(info, &info->var);
 520
 521        /* ...set frame size and burst length = 8 words (?) */
 522        value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
 523        value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 524        lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
 525
 526        /* Now, the LCDC core... */
 527
 528        /* Set pixel clock */
 529        if (cpu_is_at91sam9g45() && !cpu_is_at91sam9g45es())
 530                pix_factor = 1;
 531
 532        clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 533
 534        value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
 535
 536        if (value < pix_factor) {
 537                dev_notice(info->device, "Bypassing pixel clock divider\n");
 538                lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 539        } else {
 540                value = (value / pix_factor) - 1;
 541                dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
 542                                value);
 543                lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
 544                                value << ATMEL_LCDC_CLKVAL_OFFSET);
 545                info->var.pixclock =
 546                        KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1)));
 547                dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
 548                                        PICOS2KHZ(info->var.pixclock));
 549        }
 550
 551
 552        /* Initialize control register 2 */
 553        value = sinfo->default_lcdcon2;
 554
 555        if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
 556                value |= ATMEL_LCDC_INVLINE_INVERTED;
 557        if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
 558                value |= ATMEL_LCDC_INVFRAME_INVERTED;
 559
 560        switch (info->var.bits_per_pixel) {
 561                case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
 562                case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
 563                case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
 564                case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
 565                case 15: /* fall through */
 566                case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
 567                case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
 568                case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
 569                default: BUG(); break;
 570        }
 571        dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
 572        lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
 573
 574        /* Vertical timing */
 575        value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 576        value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
 577        value |= info->var.lower_margin;
 578        dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
 579        lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
 580
 581        /* Horizontal timing */
 582        value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 583        value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 584        value |= (info->var.left_margin - 1);
 585        dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
 586        lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
 587
 588        /* Horizontal value (aka line size) */
 589        hozval_linesz = compute_hozval(info->var.xres,
 590                                        lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2));
 591
 592        /* Display size */
 593        value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 594        value |= info->var.yres - 1;
 595        dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
 596        lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
 597
 598        /* FIFO Threshold: Use formula from data sheet */
 599        value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 600        lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
 601
 602        /* Toggle LCD_MODE every frame */
 603        lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
 604
 605        /* Disable all interrupts */
 606        lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
 607        /* Enable FIFO & DMA errors */
 608        lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
 609
 610        /* ...wait for DMA engine to become idle... */
 611        while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 612                msleep(10);
 613
 614        atmel_lcdfb_start(sinfo);
 615
 616        dev_dbg(info->device, "  * DONE\n");
 617
 618        return 0;
 619}
 620
 621static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
 622{
 623        chan &= 0xffff;
 624        chan >>= 16 - bf->length;
 625        return chan << bf->offset;
 626}
 627
 628/**
 629 *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
 630 *      @regno: Which register in the CLUT we are programming
 631 *      @red: The red value which can be up to 16 bits wide
 632 *      @green: The green value which can be up to 16 bits wide
 633 *      @blue:  The blue value which can be up to 16 bits wide.
 634 *      @transp: If supported the alpha value which can be up to 16 bits wide.
 635 *      @info: frame buffer info structure
 636 *
 637 *      Set a single color register. The values supplied have a 16 bit
 638 *      magnitude which needs to be scaled in this function for the hardware.
 639 *      Things to take into consideration are how many color registers, if
 640 *      any, are supported with the current color visual. With truecolor mode
 641 *      no color palettes are supported. Here a pseudo palette is created
 642 *      which we store the value in pseudo_palette in struct fb_info. For
 643 *      pseudocolor mode we have a limited color palette. To deal with this
 644 *      we can program what color is displayed for a particular pixel value.
 645 *      DirectColor is similar in that we can program each color field. If
 646 *      we have a static colormap we don't need to implement this function.
 647 *
 648 *      Returns negative errno on error, or zero on success. In an
 649 *      ideal world, this would have been the case, but as it turns
 650 *      out, the other drivers return 1 on failure, so that's what
 651 *      we're going to do.
 652 */
 653static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
 654                             unsigned int green, unsigned int blue,
 655                             unsigned int transp, struct fb_info *info)
 656{
 657        struct atmel_lcdfb_info *sinfo = info->par;
 658        unsigned int val;
 659        u32 *pal;
 660        int ret = 1;
 661
 662        if (info->var.grayscale)
 663                red = green = blue = (19595 * red + 38470 * green
 664                                      + 7471 * blue) >> 16;
 665
 666        switch (info->fix.visual) {
 667        case FB_VISUAL_TRUECOLOR:
 668                if (regno < 16) {
 669                        pal = info->pseudo_palette;
 670
 671                        val  = chan_to_field(red, &info->var.red);
 672                        val |= chan_to_field(green, &info->var.green);
 673                        val |= chan_to_field(blue, &info->var.blue);
 674
 675                        pal[regno] = val;
 676                        ret = 0;
 677                }
 678                break;
 679
 680        case FB_VISUAL_PSEUDOCOLOR:
 681                if (regno < 256) {
 682                        if (cpu_is_at91sam9261() || cpu_is_at91sam9263()
 683                            || cpu_is_at91sam9rl()) {
 684                                /* old style I+BGR:555 */
 685                                val  = ((red   >> 11) & 0x001f);
 686                                val |= ((green >>  6) & 0x03e0);
 687                                val |= ((blue  >>  1) & 0x7c00);
 688
 689                                /*
 690                                 * TODO: intensity bit. Maybe something like
 691                                 *   ~(red[10] ^ green[10] ^ blue[10]) & 1
 692                                 */
 693                        } else {
 694                                /* new style BGR:565 / RGB:565 */
 695                                if (sinfo->lcd_wiring_mode ==
 696                                    ATMEL_LCDC_WIRING_RGB) {
 697                                        val  = ((blue >> 11) & 0x001f);
 698                                        val |= ((red  >>  0) & 0xf800);
 699                                } else {
 700                                        val  = ((red  >> 11) & 0x001f);
 701                                        val |= ((blue >>  0) & 0xf800);
 702                                }
 703
 704                                val |= ((green >>  5) & 0x07e0);
 705                        }
 706
 707                        lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 708                        ret = 0;
 709                }
 710                break;
 711
 712        case FB_VISUAL_MONO01:
 713                if (regno < 2) {
 714                        val = (regno == 0) ? 0x00 : 0x1F;
 715                        lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 716                        ret = 0;
 717                }
 718                break;
 719
 720        }
 721
 722        return ret;
 723}
 724
 725static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
 726                               struct fb_info *info)
 727{
 728        dev_dbg(info->device, "%s\n", __func__);
 729
 730        atmel_lcdfb_update_dma(info, var);
 731
 732        return 0;
 733}
 734
 735static int atmel_lcdfb_blank(int blank_mode, struct fb_info *info)
 736{
 737        struct atmel_lcdfb_info *sinfo = info->par;
 738
 739        switch (blank_mode) {
 740        case FB_BLANK_UNBLANK:
 741        case FB_BLANK_NORMAL:
 742                atmel_lcdfb_start(sinfo);
 743                break;
 744        case FB_BLANK_VSYNC_SUSPEND:
 745        case FB_BLANK_HSYNC_SUSPEND:
 746                break;
 747        case FB_BLANK_POWERDOWN:
 748                atmel_lcdfb_stop(sinfo);
 749                break;
 750        default:
 751                return -EINVAL;
 752        }
 753
 754        /* let fbcon do a soft blank for us */
 755        return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
 756}
 757
 758static struct fb_ops atmel_lcdfb_ops = {
 759        .owner          = THIS_MODULE,
 760        .fb_check_var   = atmel_lcdfb_check_var,
 761        .fb_set_par     = atmel_lcdfb_set_par,
 762        .fb_setcolreg   = atmel_lcdfb_setcolreg,
 763        .fb_blank       = atmel_lcdfb_blank,
 764        .fb_pan_display = atmel_lcdfb_pan_display,
 765        .fb_fillrect    = cfb_fillrect,
 766        .fb_copyarea    = cfb_copyarea,
 767        .fb_imageblit   = cfb_imageblit,
 768};
 769
 770static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
 771{
 772        struct fb_info *info = dev_id;
 773        struct atmel_lcdfb_info *sinfo = info->par;
 774        u32 status;
 775
 776        status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
 777        if (status & ATMEL_LCDC_UFLWI) {
 778                dev_warn(info->device, "FIFO underflow %#x\n", status);
 779                /* reset DMA and FIFO to avoid screen shifting */
 780                schedule_work(&sinfo->task);
 781        }
 782        lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
 783        return IRQ_HANDLED;
 784}
 785
 786/*
 787 * LCD controller task (to reset the LCD)
 788 */
 789static void atmel_lcdfb_task(struct work_struct *work)
 790{
 791        struct atmel_lcdfb_info *sinfo =
 792                container_of(work, struct atmel_lcdfb_info, task);
 793
 794        atmel_lcdfb_reset(sinfo);
 795}
 796
 797static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
 798{
 799        struct fb_info *info = sinfo->info;
 800        int ret = 0;
 801
 802        info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
 803
 804        dev_info(info->device,
 805               "%luKiB frame buffer at %08lx (mapped at %p)\n",
 806               (unsigned long)info->fix.smem_len / 1024,
 807               (unsigned long)info->fix.smem_start,
 808               info->screen_base);
 809
 810        /* Allocate colormap */
 811        ret = fb_alloc_cmap(&info->cmap, 256, 0);
 812        if (ret < 0)
 813                dev_err(info->device, "Alloc color map failed\n");
 814
 815        return ret;
 816}
 817
 818static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
 819{
 820        if (sinfo->bus_clk)
 821                clk_enable(sinfo->bus_clk);
 822        clk_enable(sinfo->lcdc_clk);
 823}
 824
 825static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
 826{
 827        if (sinfo->bus_clk)
 828                clk_disable(sinfo->bus_clk);
 829        clk_disable(sinfo->lcdc_clk);
 830}
 831
 832
 833static int __init atmel_lcdfb_probe(struct platform_device *pdev)
 834{
 835        struct device *dev = &pdev->dev;
 836        struct fb_info *info;
 837        struct atmel_lcdfb_info *sinfo;
 838        struct atmel_lcdfb_info *pdata_sinfo;
 839        struct fb_videomode fbmode;
 840        struct resource *regs = NULL;
 841        struct resource *map = NULL;
 842        int ret;
 843
 844        dev_dbg(dev, "%s BEGIN\n", __func__);
 845
 846        ret = -ENOMEM;
 847        info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
 848        if (!info) {
 849                dev_err(dev, "cannot allocate memory\n");
 850                goto out;
 851        }
 852
 853        sinfo = info->par;
 854
 855        if (dev->platform_data) {
 856                pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data;
 857                sinfo->default_bpp = pdata_sinfo->default_bpp;
 858                sinfo->default_dmacon = pdata_sinfo->default_dmacon;
 859                sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2;
 860                sinfo->default_monspecs = pdata_sinfo->default_monspecs;
 861                sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
 862                sinfo->guard_time = pdata_sinfo->guard_time;
 863                sinfo->smem_len = pdata_sinfo->smem_len;
 864                sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
 865                sinfo->lcdcon_pol_negative = pdata_sinfo->lcdcon_pol_negative;
 866                sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
 867        } else {
 868                dev_err(dev, "cannot get default configuration\n");
 869                goto free_info;
 870        }
 871        sinfo->info = info;
 872        sinfo->pdev = pdev;
 873
 874        strcpy(info->fix.id, sinfo->pdev->name);
 875        info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
 876        info->pseudo_palette = sinfo->pseudo_palette;
 877        info->fbops = &atmel_lcdfb_ops;
 878
 879        memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs));
 880        info->fix = atmel_lcdfb_fix;
 881
 882        /* Enable LCDC Clocks */
 883        if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()
 884         || cpu_is_at32ap7000()) {
 885                sinfo->bus_clk = clk_get(dev, "hck1");
 886                if (IS_ERR(sinfo->bus_clk)) {
 887                        ret = PTR_ERR(sinfo->bus_clk);
 888                        goto free_info;
 889                }
 890        }
 891        sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
 892        if (IS_ERR(sinfo->lcdc_clk)) {
 893                ret = PTR_ERR(sinfo->lcdc_clk);
 894                goto put_bus_clk;
 895        }
 896        atmel_lcdfb_start_clock(sinfo);
 897
 898        ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
 899                        info->monspecs.modedb_len, info->monspecs.modedb,
 900                        sinfo->default_bpp);
 901        if (!ret) {
 902                dev_err(dev, "no suitable video mode found\n");
 903                goto stop_clk;
 904        }
 905
 906
 907        regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 908        if (!regs) {
 909                dev_err(dev, "resources unusable\n");
 910                ret = -ENXIO;
 911                goto stop_clk;
 912        }
 913
 914        sinfo->irq_base = platform_get_irq(pdev, 0);
 915        if (sinfo->irq_base < 0) {
 916                dev_err(dev, "unable to get irq\n");
 917                ret = sinfo->irq_base;
 918                goto stop_clk;
 919        }
 920
 921        /* Initialize video memory */
 922        map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 923        if (map) {
 924                /* use a pre-allocated memory buffer */
 925                info->fix.smem_start = map->start;
 926                info->fix.smem_len = resource_size(map);
 927                if (!request_mem_region(info->fix.smem_start,
 928                                        info->fix.smem_len, pdev->name)) {
 929                        ret = -EBUSY;
 930                        goto stop_clk;
 931                }
 932
 933                info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 934                if (!info->screen_base)
 935                        goto release_intmem;
 936
 937                /*
 938                 * Don't clear the framebuffer -- someone may have set
 939                 * up a splash image.
 940                 */
 941        } else {
 942                /* allocate memory buffer */
 943                ret = atmel_lcdfb_alloc_video_memory(sinfo);
 944                if (ret < 0) {
 945                        dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
 946                        goto stop_clk;
 947                }
 948        }
 949
 950        /* LCDC registers */
 951        info->fix.mmio_start = regs->start;
 952        info->fix.mmio_len = resource_size(regs);
 953
 954        if (!request_mem_region(info->fix.mmio_start,
 955                                info->fix.mmio_len, pdev->name)) {
 956                ret = -EBUSY;
 957                goto free_fb;
 958        }
 959
 960        sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
 961        if (!sinfo->mmio) {
 962                dev_err(dev, "cannot map LCDC registers\n");
 963                goto release_mem;
 964        }
 965
 966        /* Initialize PWM for contrast or backlight ("off") */
 967        init_contrast(sinfo);
 968
 969        /* interrupt */
 970        ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
 971        if (ret) {
 972                dev_err(dev, "request_irq failed: %d\n", ret);
 973                goto unmap_mmio;
 974        }
 975
 976        /* Some operations on the LCDC might sleep and
 977         * require a preemptible task context */
 978        INIT_WORK(&sinfo->task, atmel_lcdfb_task);
 979
 980        ret = atmel_lcdfb_init_fbinfo(sinfo);
 981        if (ret < 0) {
 982                dev_err(dev, "init fbinfo failed: %d\n", ret);
 983                goto unregister_irqs;
 984        }
 985
 986        /*
 987         * This makes sure that our colour bitfield
 988         * descriptors are correctly initialised.
 989         */
 990        atmel_lcdfb_check_var(&info->var, info);
 991
 992        ret = fb_set_var(info, &info->var);
 993        if (ret) {
 994                dev_warn(dev, "unable to set display parameters\n");
 995                goto free_cmap;
 996        }
 997
 998        dev_set_drvdata(dev, info);
 999
1000        /*
1001         * Tell the world that we're ready to go
1002         */
1003        ret = register_framebuffer(info);
1004        if (ret < 0) {
1005                dev_err(dev, "failed to register framebuffer device: %d\n", ret);
1006                goto reset_drvdata;
1007        }
1008
1009        /* add selected videomode to modelist */
1010        fb_var_to_videomode(&fbmode, &info->var);
1011        fb_add_videomode(&fbmode, &info->modelist);
1012
1013        /* Power up the LCDC screen */
1014        if (sinfo->atmel_lcdfb_power_control)
1015                sinfo->atmel_lcdfb_power_control(1);
1016
1017        dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1018                       info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
1019
1020        return 0;
1021
1022reset_drvdata:
1023        dev_set_drvdata(dev, NULL);
1024free_cmap:
1025        fb_dealloc_cmap(&info->cmap);
1026unregister_irqs:
1027        cancel_work_sync(&sinfo->task);
1028        free_irq(sinfo->irq_base, info);
1029unmap_mmio:
1030        exit_backlight(sinfo);
1031        iounmap(sinfo->mmio);
1032release_mem:
1033        release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1034free_fb:
1035        if (map)
1036                iounmap(info->screen_base);
1037        else
1038                atmel_lcdfb_free_video_memory(sinfo);
1039
1040release_intmem:
1041        if (map)
1042                release_mem_region(info->fix.smem_start, info->fix.smem_len);
1043stop_clk:
1044        atmel_lcdfb_stop_clock(sinfo);
1045        clk_put(sinfo->lcdc_clk);
1046put_bus_clk:
1047        if (sinfo->bus_clk)
1048                clk_put(sinfo->bus_clk);
1049free_info:
1050        framebuffer_release(info);
1051out:
1052        dev_dbg(dev, "%s FAILED\n", __func__);
1053        return ret;
1054}
1055
1056static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1057{
1058        struct device *dev = &pdev->dev;
1059        struct fb_info *info = dev_get_drvdata(dev);
1060        struct atmel_lcdfb_info *sinfo;
1061
1062        if (!info || !info->par)
1063                return 0;
1064        sinfo = info->par;
1065
1066        cancel_work_sync(&sinfo->task);
1067        exit_backlight(sinfo);
1068        if (sinfo->atmel_lcdfb_power_control)
1069                sinfo->atmel_lcdfb_power_control(0);
1070        unregister_framebuffer(info);
1071        atmel_lcdfb_stop_clock(sinfo);
1072        clk_put(sinfo->lcdc_clk);
1073        if (sinfo->bus_clk)
1074                clk_put(sinfo->bus_clk);
1075        fb_dealloc_cmap(&info->cmap);
1076        free_irq(sinfo->irq_base, info);
1077        iounmap(sinfo->mmio);
1078        release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1079        if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1080                iounmap(info->screen_base);
1081                release_mem_region(info->fix.smem_start, info->fix.smem_len);
1082        } else {
1083                atmel_lcdfb_free_video_memory(sinfo);
1084        }
1085
1086        dev_set_drvdata(dev, NULL);
1087        framebuffer_release(info);
1088
1089        return 0;
1090}
1091
1092#ifdef CONFIG_PM
1093
1094static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1095{
1096        struct fb_info *info = platform_get_drvdata(pdev);
1097        struct atmel_lcdfb_info *sinfo = info->par;
1098
1099        /*
1100         * We don't want to handle interrupts while the clock is
1101         * stopped. It may take forever.
1102         */
1103        lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1104
1105        sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_CTR);
1106        lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1107        if (sinfo->atmel_lcdfb_power_control)
1108                sinfo->atmel_lcdfb_power_control(0);
1109
1110        atmel_lcdfb_stop(sinfo);
1111        atmel_lcdfb_stop_clock(sinfo);
1112
1113        return 0;
1114}
1115
1116static int atmel_lcdfb_resume(struct platform_device *pdev)
1117{
1118        struct fb_info *info = platform_get_drvdata(pdev);
1119        struct atmel_lcdfb_info *sinfo = info->par;
1120
1121        atmel_lcdfb_start_clock(sinfo);
1122        atmel_lcdfb_start(sinfo);
1123        if (sinfo->atmel_lcdfb_power_control)
1124                sinfo->atmel_lcdfb_power_control(1);
1125        lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1126
1127        /* Enable FIFO & DMA errors */
1128        lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1129                        | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1130
1131        return 0;
1132}
1133
1134#else
1135#define atmel_lcdfb_suspend     NULL
1136#define atmel_lcdfb_resume      NULL
1137#endif
1138
1139static struct platform_driver atmel_lcdfb_driver = {
1140        .remove         = __exit_p(atmel_lcdfb_remove),
1141        .suspend        = atmel_lcdfb_suspend,
1142        .resume         = atmel_lcdfb_resume,
1143
1144        .driver         = {
1145                .name   = "atmel_lcdfb",
1146                .owner  = THIS_MODULE,
1147        },
1148};
1149
1150static int __init atmel_lcdfb_init(void)
1151{
1152        return platform_driver_probe(&atmel_lcdfb_driver, atmel_lcdfb_probe);
1153}
1154
1155static void __exit atmel_lcdfb_exit(void)
1156{
1157        platform_driver_unregister(&atmel_lcdfb_driver);
1158}
1159
1160module_init(atmel_lcdfb_init);
1161module_exit(atmel_lcdfb_exit);
1162
1163MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1164MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1165MODULE_LICENSE("GPL");
1166
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