drivers/video/atmel_lcdfb.c

   1 /*
   2  *  Driver for AT91/AT32 LCD Controller
   3  *
   4  *  Copyright (C) 2007 Atmel Corporation
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file COPYING in the main directory of this archive for
   8  * more details.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/dma-mapping.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/clk.h>
  16 #include <linux/fb.h>
  17 #include <linux/init.h>
  18 #include <linux/delay.h>
  19 #include <linux/backlight.h>
  20 #include <linux/gfp.h>
  21 #include <linux/module.h>
  22 #include <linux/platform_data/atmel.h>
  23
  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 struct atmel_lcdfb_config {
  38         bool have_alt_pixclock;
  39         bool have_hozval;
  40         bool have_intensity_bit;
  41 };
  42
  43 static struct atmel_lcdfb_config at91sam9261_config = {
  44         .have_hozval            = true,
  45         .have_intensity_bit     = true,
  46 };
  47
  48 static struct atmel_lcdfb_config at91sam9263_config = {
  49         .have_intensity_bit     = true,
  50 };
  51
  52 static struct atmel_lcdfb_config at91sam9g10_config = {
  53         .have_hozval            = true,
  54 };
  55
  56 static struct atmel_lcdfb_config at91sam9g45_config = {
  57         .have_alt_pixclock      = true,
  58 };
  59
  60 static struct atmel_lcdfb_config at91sam9g45es_config = {
  61 };
  62
  63 static struct atmel_lcdfb_config at91sam9rl_config = {
  64         .have_intensity_bit     = true,
  65 };
  66
  67 static struct atmel_lcdfb_config at32ap_config = {
  68         .have_hozval            = true,
  69 };
  70
  71 static const struct platform_device_id atmel_lcdfb_devtypes[] = {
  72         {
  73                 .name = "at91sam9261-lcdfb",
  74                 .driver_data = (unsigned long)&at91sam9261_config,
  75         }, {
  76                 .name = "at91sam9263-lcdfb",
  77                 .driver_data = (unsigned long)&at91sam9263_config,
  78         }, {
  79                 .name = "at91sam9g10-lcdfb",
  80                 .driver_data = (unsigned long)&at91sam9g10_config,
  81         }, {
  82                 .name = "at91sam9g45-lcdfb",
  83                 .driver_data = (unsigned long)&at91sam9g45_config,
  84         }, {
  85                 .name = "at91sam9g45es-lcdfb",
  86                 .driver_data = (unsigned long)&at91sam9g45es_config,
  87         }, {
  88                 .name = "at91sam9rl-lcdfb",
  89                 .driver_data = (unsigned long)&at91sam9rl_config,
  90         }, {
  91                 .name = "at32ap-lcdfb",
  92                 .driver_data = (unsigned long)&at32ap_config,
  93         }, {
  94                 /* terminator */
  95         }
  96 };
  97
  98 static struct atmel_lcdfb_config *
  99 atmel_lcdfb_get_config(struct platform_device *pdev)
 100 {
 101         unsigned long data;
 102
 103         data = platform_get_device_id(pdev)->driver_data;
 104
 105         return (struct atmel_lcdfb_config *)data;
 106 }
 107
 108 #if defined(CONFIG_ARCH_AT91)
 109 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
 110                                          | FBINFO_PARTIAL_PAN_OK \
 111                                          | FBINFO_HWACCEL_YPAN)
 112
 113 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
 114                                         struct fb_var_screeninfo *var,
 115                                         struct fb_info *info)
 116 {
 117
 118 }
 119 #elif defined(CONFIG_AVR32)
 120 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
 121                                         | FBINFO_PARTIAL_PAN_OK \
 122                                         | FBINFO_HWACCEL_XPAN \
 123                                         | FBINFO_HWACCEL_YPAN)
 124
 125 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
 126                                      struct fb_var_screeninfo *var,
 127                                      struct fb_info *info)
 128 {
 129         u32 dma2dcfg;
 130         u32 pixeloff;
 131
 132         pixeloff = (var->xoffset * info->var.bits_per_pixel) & 0x1f;
 133
 134         dma2dcfg = (info->var.xres_virtual - info->var.xres)
 135                  * info->var.bits_per_pixel / 8;
 136         dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
 137         lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
 138
 139         /* Update configuration */
 140         lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
 141                     lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
 142                     | ATMEL_LCDC_DMAUPDT);
 143 }
 144 #endif
 145
 146 static u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
 147                 | ATMEL_LCDC_POL_POSITIVE
 148                 | ATMEL_LCDC_ENA_PWMENABLE;
 149
 150 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
 151
 152 /* some bl->props field just changed */
 153 static int atmel_bl_update_status(struct backlight_device *bl)
 154 {
 155         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 156         int                     power = sinfo->bl_power;
 157         int                     brightness = bl->props.brightness;
 158
 159         /* REVISIT there may be a meaningful difference between
 160          * fb_blank and power ... there seem to be some cases
 161          * this doesn't handle correctly.
 162          */
 163         if (bl->props.fb_blank != sinfo->bl_power)
 164                 power = bl->props.fb_blank;
 165         else if (bl->props.power != sinfo->bl_power)
 166                 power = bl->props.power;
 167
 168         if (brightness < 0 && power == FB_BLANK_UNBLANK)
 169                 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 170         else if (power != FB_BLANK_UNBLANK)
 171                 brightness = 0;
 172
 173         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
 174         if (contrast_ctr & ATMEL_LCDC_POL_POSITIVE)
 175                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
 176                         brightness ? contrast_ctr : 0);
 177         else
 178                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 179
 180         bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
 181
 182         return 0;
 183 }
 184
 185 static int atmel_bl_get_brightness(struct backlight_device *bl)
 186 {
 187         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 188
 189         return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 190 }
 191
 192 static const struct backlight_ops atmel_lcdc_bl_ops = {
 193         .update_status = atmel_bl_update_status,
 194         .get_brightness = atmel_bl_get_brightness,
 195 };
 196
 197 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 198 {
 199         struct backlight_properties props;
 200         struct backlight_device *bl;
 201
 202         sinfo->bl_power = FB_BLANK_UNBLANK;
 203
 204         if (sinfo->backlight)
 205                 return;
 206
 207         memset(&props, 0, sizeof(struct backlight_properties));
 208         props.type = BACKLIGHT_RAW;
 209         props.max_brightness = 0xff;
 210         bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo,
 211                                        &atmel_lcdc_bl_ops, &props);
 212         if (IS_ERR(bl)) {
 213                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
 214                                 PTR_ERR(bl));
 215                 return;
 216         }
 217         sinfo->backlight = bl;
 218
 219         bl->props.power = FB_BLANK_UNBLANK;
 220         bl->props.fb_blank = FB_BLANK_UNBLANK;
 221         bl->props.brightness = atmel_bl_get_brightness(bl);
 222 }
 223
 224 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 225 {
 226         if (sinfo->backlight)
 227                 backlight_device_unregister(sinfo->backlight);
 228 }
 229
 230 #else
 231
 232 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 233 {
 234         dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
 235 }
 236
 237 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 238 {
 239 }
 240
 241 #endif
 242
 243 static void init_contrast(struct atmel_lcdfb_info *sinfo)
 244 {
 245         /* contrast pwm can be 'inverted' */
 246         if (sinfo->lcdcon_pol_negative)
 247                         contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
 248
 249         /* have some default contrast/backlight settings */
 250         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 251         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 252
 253         if (sinfo->lcdcon_is_backlight)
 254                 init_backlight(sinfo);
 255 }
 256
 257
 258 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
 259         .type           = FB_TYPE_PACKED_PIXELS,
 260         .visual         = FB_VISUAL_TRUECOLOR,
 261         .xpanstep       = 0,
 262         .ypanstep       = 1,
 263         .ywrapstep      = 0,
 264         .accel          = FB_ACCEL_NONE,
 265 };
 266
 267 static unsigned long compute_hozval(struct atmel_lcdfb_info *sinfo,
 268                                                         unsigned long xres)
 269 {
 270         unsigned long lcdcon2;
 271         unsigned long value;
 272
 273         if (!sinfo->config->have_hozval)
 274                 return xres;
 275
 276         lcdcon2 = lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2);
 277         value = xres;
 278         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
 279                 /* STN display */
 280                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
 281                         value *= 3;
 282                 }
 283                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
 284                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
 285                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
 286                         value = DIV_ROUND_UP(value, 4);
 287                 else
 288                         value = DIV_ROUND_UP(value, 8);
 289         }
 290
 291         return value;
 292 }
 293
 294 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
 295 {
 296         /* Turn off the LCD controller and the DMA controller */
 297         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 298                         sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
 299
 300         /* Wait for the LCDC core to become idle */
 301         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 302                 msleep(10);
 303
 304         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
 305 }
 306
 307 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
 308 {
 309         atmel_lcdfb_stop_nowait(sinfo);
 310
 311         /* Wait for DMA engine to become idle... */
 312         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 313                 msleep(10);
 314 }
 315
 316 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
 317 {
 318         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon);
 319         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 320                 (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
 321                 | ATMEL_LCDC_PWR);
 322 }
 323
 324 static void atmel_lcdfb_update_dma(struct fb_info *info,
 325                                struct fb_var_screeninfo *var)
 326 {
 327         struct atmel_lcdfb_info *sinfo = info->par;
 328         struct fb_fix_screeninfo *fix = &info->fix;
 329         unsigned long dma_addr;
 330
 331         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
 332                     + var->xoffset * info->var.bits_per_pixel / 8);
 333
 334         dma_addr &= ~3UL;
 335
 336         /* Set framebuffer DMA base address and pixel offset */
 337         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
 338
 339         atmel_lcdfb_update_dma2d(sinfo, var, info);
 340 }
 341
 342 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
 343 {
 344         struct fb_info *info = sinfo->info;
 345
 346         dma_free_writecombine(info->device, info->fix.smem_len,
 347                                 info->screen_base, info->fix.smem_start);
 348 }
 349
 350 /**
 351  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
 352  *      @sinfo: the frame buffer to allocate memory for
 353  *
 354  *      This function is called only from the atmel_lcdfb_probe()
 355  *      so no locking by fb_info->mm_lock around smem_len setting is needed.
 356  */
 357 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
 358 {
 359         struct fb_info *info = sinfo->info;
 360         struct fb_var_screeninfo *var = &info->var;
 361         unsigned int smem_len;
 362
 363         smem_len = (var->xres_virtual * var->yres_virtual
 364                     * ((var->bits_per_pixel + 7) / 8));
 365         info->fix.smem_len = max(smem_len, sinfo->smem_len);
 366
 367         info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
 368                                         (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
 369
 370         if (!info->screen_base) {
 371                 return -ENOMEM;
 372         }
 373
 374         memset(info->screen_base, 0, info->fix.smem_len);
 375
 376         return 0;
 377 }
 378
 379 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
 380                                                      struct fb_info *info)
 381 {
 382         struct fb_videomode varfbmode;
 383         const struct fb_videomode *fbmode = NULL;
 384
 385         fb_var_to_videomode(&varfbmode, var);
 386         fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
 387         if (fbmode)
 388                 fb_videomode_to_var(var, fbmode);
 389         return fbmode;
 390 }
 391
 392
 393 /**
 394  *      atmel_lcdfb_check_var - Validates a var passed in.
 395  *      @var: frame buffer variable screen structure
 396  *      @info: frame buffer structure that represents a single frame buffer
 397  *
 398  *      Checks to see if the hardware supports the state requested by
 399  *      var passed in. This function does not alter the hardware
 400  *      state!!!  This means the data stored in struct fb_info and
 401  *      struct atmel_lcdfb_info do not change. This includes the var
 402  *      inside of struct fb_info.  Do NOT change these. This function
 403  *      can be called on its own if we intent to only test a mode and
 404  *      not actually set it. The stuff in modedb.c is a example of
 405  *      this. If the var passed in is slightly off by what the
 406  *      hardware can support then we alter the var PASSED in to what
 407  *      we can do. If the hardware doesn't support mode change a
 408  *      -EINVAL will be returned by the upper layers. You don't need
 409  *      to implement this function then. If you hardware doesn't
 410  *      support changing the resolution then this function is not
 411  *      needed. In this case the driver would just provide a var that
 412  *      represents the static state the screen is in.
 413  *
 414  *      Returns negative errno on error, or zero on success.
 415  */
 416 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
 417                              struct fb_info *info)
 418 {
 419         struct device *dev = info->device;
 420         struct atmel_lcdfb_info *sinfo = info->par;
 421         unsigned long clk_value_khz;
 422
 423         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 424
 425         dev_dbg(dev, "%s:\n", __func__);
 426
 427         if (!(var->pixclock && var->bits_per_pixel)) {
 428                 /* choose a suitable mode if possible */
 429                 if (!atmel_lcdfb_choose_mode(var, info)) {
 430                         dev_err(dev, "needed value not specified\n");
 431                         return -EINVAL;
 432                 }
 433         }
 434
 435         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
 436         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
 437         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
 438         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
 439
 440         if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
 441                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
 442                 return -EINVAL;
 443         }
 444
 445         /* Do not allow to have real resoulution larger than virtual */
 446         if (var->xres > var->xres_virtual)
 447                 var->xres_virtual = var->xres;
 448
 449         if (var->yres > var->yres_virtual)
 450                 var->yres_virtual = var->yres;
 451
 452         /* Force same alignment for each line */
 453         var->xres = (var->xres + 3) & ~3UL;
 454         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
 455
 456         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
 457         var->transp.msb_right = 0;
 458         var->transp.offset = var->transp.length = 0;
 459         var->xoffset = var->yoffset = 0;
 460
 461         if (info->fix.smem_len) {
 462                 unsigned int smem_len = (var->xres_virtual * var->yres_virtual
 463                                          * ((var->bits_per_pixel + 7) / 8));
 464                 if (smem_len > info->fix.smem_len) {
 465                         dev_err(dev, "Frame buffer is too small (%u) for screen size (need at least %u)\n",
 466                                 info->fix.smem_len, smem_len);
 467                         return -EINVAL;
 468                 }
 469         }
 470
 471         /* Saturate vertical and horizontal timings at maximum values */
 472         var->vsync_len = min_t(u32, var->vsync_len,
 473                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
 474         var->upper_margin = min_t(u32, var->upper_margin,
 475                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
 476         var->lower_margin = min_t(u32, var->lower_margin,
 477                         ATMEL_LCDC_VFP);
 478         var->right_margin = min_t(u32, var->right_margin,
 479                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
 480         var->hsync_len = min_t(u32, var->hsync_len,
 481                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
 482         var->left_margin = min_t(u32, var->left_margin,
 483                         ATMEL_LCDC_HBP + 1);
 484
 485         /* Some parameters can't be zero */
 486         var->vsync_len = max_t(u32, var->vsync_len, 1);
 487         var->right_margin = max_t(u32, var->right_margin, 1);
 488         var->hsync_len = max_t(u32, var->hsync_len, 1);
 489         var->left_margin = max_t(u32, var->left_margin, 1);
 490
 491         switch (var->bits_per_pixel) {
 492         case 1:
 493         case 2:
 494         case 4:
 495         case 8:
 496                 var->red.offset = var->green.offset = var->blue.offset = 0;
 497                 var->red.length = var->green.length = var->blue.length
 498                         = var->bits_per_pixel;
 499                 break;
 500         case 16:
 501                 /* Older SOCs use IBGR:555 rather than BGR:565. */
 502                 if (sinfo->config->have_intensity_bit)
 503                         var->green.length = 5;
 504                 else
 505                         var->green.length = 6;
 506
 507                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 508                         /* RGB:5X5 mode */
 509                         var->red.offset = var->green.length + 5;
 510                         var->blue.offset = 0;
 511                 } else {
 512                         /* BGR:5X5 mode */
 513                         var->red.offset = 0;
 514                         var->blue.offset = var->green.length + 5;
 515                 }
 516                 var->green.offset = 5;
 517                 var->red.length = var->blue.length = 5;
 518                 break;
 519         case 32:
 520                 var->transp.offset = 24;
 521                 var->transp.length = 8;
 522                 /* fall through */
 523         case 24:
 524                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 525                         /* RGB:888 mode */
 526                         var->red.offset = 16;
 527                         var->blue.offset = 0;
 528                 } else {
 529                         /* BGR:888 mode */
 530                         var->red.offset = 0;
 531                         var->blue.offset = 16;
 532                 }
 533                 var->green.offset = 8;
 534                 var->red.length = var->green.length = var->blue.length = 8;
 535                 break;
 536         default:
 537                 dev_err(dev, "color depth %d not supported\n",
 538                                         var->bits_per_pixel);
 539                 return -EINVAL;
 540         }
 541
 542         return 0;
 543 }
 544
 545 /*
 546  * LCD reset sequence
 547  */
 548 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
 549 {
 550         might_sleep();
 551
 552         atmel_lcdfb_stop(sinfo);
 553         atmel_lcdfb_start(sinfo);
 554 }
 555
 556 /**
 557  *      atmel_lcdfb_set_par - Alters the hardware state.
 558  *      @info: frame buffer structure that represents a single frame buffer
 559  *
 560  *      Using the fb_var_screeninfo in fb_info we set the resolution
 561  *      of the this particular framebuffer. This function alters the
 562  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
 563  *      not alter var in fb_info since we are using that data. This
 564  *      means we depend on the data in var inside fb_info to be
 565  *      supported by the hardware.  atmel_lcdfb_check_var is always called
 566  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
 567  *      change the resolution you don't need this function.
 568  *
 569  */
 570 static int atmel_lcdfb_set_par(struct fb_info *info)
 571 {
 572         struct atmel_lcdfb_info *sinfo = info->par;
 573         unsigned long hozval_linesz;
 574         unsigned long value;
 575         unsigned long clk_value_khz;
 576         unsigned long bits_per_line;
 577         unsigned long pix_factor = 2;
 578
 579         might_sleep();
 580
 581         dev_dbg(info->device, "%s:\n", __func__);
 582         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
 583                  info->var.xres, info->var.yres,
 584                  info->var.xres_virtual, info->var.yres_virtual);
 585
 586         atmel_lcdfb_stop_nowait(sinfo);
 587
 588         if (info->var.bits_per_pixel == 1)
 589                 info->fix.visual = FB_VISUAL_MONO01;
 590         else if (info->var.bits_per_pixel <= 8)
 591                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 592         else
 593                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 594
 595         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
 596         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
 597
 598         /* Re-initialize the DMA engine... */
 599         dev_dbg(info->device, "  * update DMA engine\n");
 600         atmel_lcdfb_update_dma(info, &info->var);
 601
 602         /* ...set frame size and burst length = 8 words (?) */
 603         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
 604         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 605         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
 606
 607         /* Now, the LCDC core... */
 608
 609         /* Set pixel clock */
 610         if (sinfo->config->have_alt_pixclock)
 611                 pix_factor = 1;
 612
 613         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 614
 615         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
 616
 617         if (value < pix_factor) {
 618                 dev_notice(info->device, "Bypassing pixel clock divider\n");
 619                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 620         } else {
 621                 value = (value / pix_factor) - 1;
 622                 dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
 623                                 value);
 624                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
 625                                 value << ATMEL_LCDC_CLKVAL_OFFSET);
 626                 info->var.pixclock =
 627                         KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1)));
 628                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
 629                                         PICOS2KHZ(info->var.pixclock));
 630         }
 631
 632
 633         /* Initialize control register 2 */
 634         value = sinfo->default_lcdcon2;
 635
 636         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
 637                 value |= ATMEL_LCDC_INVLINE_INVERTED;
 638         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
 639                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
 640
 641         switch (info->var.bits_per_pixel) {
 642                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
 643                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
 644                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
 645                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
 646                 case 15: /* fall through */
 647                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
 648                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
 649                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
 650                 default: BUG(); break;
 651         }
 652         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
 653         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
 654
 655         /* Vertical timing */
 656         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 657         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
 658         value |= info->var.lower_margin;
 659         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
 660         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
 661
 662         /* Horizontal timing */
 663         value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 664         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 665         value |= (info->var.left_margin - 1);
 666         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
 667         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
 668
 669         /* Horizontal value (aka line size) */
 670         hozval_linesz = compute_hozval(sinfo, info->var.xres);
 671
 672         /* Display size */
 673         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 674         value |= info->var.yres - 1;
 675         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
 676         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
 677
 678         /* FIFO Threshold: Use formula from data sheet */
 679         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 680         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
 681
 682         /* Toggle LCD_MODE every frame */
 683         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
 684
 685         /* Disable all interrupts */
 686         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
 687         /* Enable FIFO & DMA errors */
 688         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
 689
 690         /* ...wait for DMA engine to become idle... */
 691         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 692                 msleep(10);
 693
 694         atmel_lcdfb_start(sinfo);
 695
 696         dev_dbg(info->device, "  * DONE\n");
 697
 698         return 0;
 699 }
 700
 701 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
 702 {
 703         chan &= 0xffff;
 704         chan >>= 16 - bf->length;
 705         return chan << bf->offset;
 706 }
 707
 708 /**
 709  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
 710  *      @regno: Which register in the CLUT we are programming
 711  *      @red: The red value which can be up to 16 bits wide
 712  *      @green: The green value which can be up to 16 bits wide
 713  *      @blue:  The blue value which can be up to 16 bits wide.
 714  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 715  *      @info: frame buffer info structure
 716  *
 717  *      Set a single color register. The values supplied have a 16 bit
 718  *      magnitude which needs to be scaled in this function for the hardware.
 719  *      Things to take into consideration are how many color registers, if
 720  *      any, are supported with the current color visual. With truecolor mode
 721  *      no color palettes are supported. Here a pseudo palette is created
 722  *      which we store the value in pseudo_palette in struct fb_info. For
 723  *      pseudocolor mode we have a limited color palette. To deal with this
 724  *      we can program what color is displayed for a particular pixel value.
 725  *      DirectColor is similar in that we can program each color field. If
 726  *      we have a static colormap we don't need to implement this function.
 727  *
 728  *      Returns negative errno on error, or zero on success. In an
 729  *      ideal world, this would have been the case, but as it turns
 730  *      out, the other drivers return 1 on failure, so that's what
 731  *      we're going to do.
 732  */
 733 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
 734                              unsigned int green, unsigned int blue,
 735                              unsigned int transp, struct fb_info *info)
 736 {
 737         struct atmel_lcdfb_info *sinfo = info->par;
 738         unsigned int val;
 739         u32 *pal;
 740         int ret = 1;
 741
 742         if (info->var.grayscale)
 743                 red = green = blue = (19595 * red + 38470 * green
 744                                       + 7471 * blue) >> 16;
 745
 746         switch (info->fix.visual) {
 747         case FB_VISUAL_TRUECOLOR:
 748                 if (regno < 16) {
 749                         pal = info->pseudo_palette;
 750
 751                         val  = chan_to_field(red, &info->var.red);
 752                         val |= chan_to_field(green, &info->var.green);
 753                         val |= chan_to_field(blue, &info->var.blue);
 754
 755                         pal[regno] = val;
 756                         ret = 0;
 757                 }
 758                 break;
 759
 760         case FB_VISUAL_PSEUDOCOLOR:
 761                 if (regno < 256) {
 762                         if (sinfo->config->have_intensity_bit) {
 763                                 /* old style I+BGR:555 */
 764                                 val  = ((red   >> 11) & 0x001f);
 765                                 val |= ((green >>  6) & 0x03e0);
 766                                 val |= ((blue  >>  1) & 0x7c00);
 767
 768                                 /*
 769                                  * TODO: intensity bit. Maybe something like
 770                                  *   ~(red[10] ^ green[10] ^ blue[10]) & 1
 771                                  */
 772                         } else {
 773                                 /* new style BGR:565 / RGB:565 */
 774                                 if (sinfo->lcd_wiring_mode ==
 775                                     ATMEL_LCDC_WIRING_RGB) {
 776                                         val  = ((blue >> 11) & 0x001f);
 777                                         val |= ((red  >>  0) & 0xf800);
 778                                 } else {
 779                                         val  = ((red  >> 11) & 0x001f);
 780                                         val |= ((blue >>  0) & 0xf800);
 781                                 }
 782
 783                                 val |= ((green >>  5) & 0x07e0);
 784                         }
 785
 786                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 787                         ret = 0;
 788                 }
 789                 break;
 790
 791         case FB_VISUAL_MONO01:
 792                 if (regno < 2) {
 793                         val = (regno == 0) ? 0x00 : 0x1F;
 794                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 795                         ret = 0;
 796                 }
 797                 break;
 798
 799         }
 800
 801         return ret;
 802 }
 803
 804 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
 805                                struct fb_info *info)
 806 {
 807         dev_dbg(info->device, "%s\n", __func__);
 808
 809         atmel_lcdfb_update_dma(info, var);
 810
 811         return 0;
 812 }
 813
 814 static int atmel_lcdfb_blank(int blank_mode, struct fb_info *info)
 815 {
 816         struct atmel_lcdfb_info *sinfo = info->par;
 817
 818         switch (blank_mode) {
 819         case FB_BLANK_UNBLANK:
 820         case FB_BLANK_NORMAL:
 821                 atmel_lcdfb_start(sinfo);
 822                 break;
 823         case FB_BLANK_VSYNC_SUSPEND:
 824         case FB_BLANK_HSYNC_SUSPEND:
 825                 break;
 826         case FB_BLANK_POWERDOWN:
 827                 atmel_lcdfb_stop(sinfo);
 828                 break;
 829         default:
 830                 return -EINVAL;
 831         }
 832
 833         /* let fbcon do a soft blank for us */
 834         return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
 835 }
 836
 837 static struct fb_ops atmel_lcdfb_ops = {
 838         .owner          = THIS_MODULE,
 839         .fb_check_var   = atmel_lcdfb_check_var,
 840         .fb_set_par     = atmel_lcdfb_set_par,
 841         .fb_setcolreg   = atmel_lcdfb_setcolreg,
 842         .fb_blank       = atmel_lcdfb_blank,
 843         .fb_pan_display = atmel_lcdfb_pan_display,
 844         .fb_fillrect    = cfb_fillrect,
 845         .fb_copyarea    = cfb_copyarea,
 846         .fb_imageblit   = cfb_imageblit,
 847 };
 848
 849 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
 850 {
 851         struct fb_info *info = dev_id;
 852         struct atmel_lcdfb_info *sinfo = info->par;
 853         u32 status;
 854
 855         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
 856         if (status & ATMEL_LCDC_UFLWI) {
 857                 dev_warn(info->device, "FIFO underflow %#x\n", status);
 858                 /* reset DMA and FIFO to avoid screen shifting */
 859                 schedule_work(&sinfo->task);
 860         }
 861         lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
 862         return IRQ_HANDLED;
 863 }
 864
 865 /*
 866  * LCD controller task (to reset the LCD)
 867  */
 868 static void atmel_lcdfb_task(struct work_struct *work)
 869 {
 870         struct atmel_lcdfb_info *sinfo =
 871                 container_of(work, struct atmel_lcdfb_info, task);
 872
 873         atmel_lcdfb_reset(sinfo);
 874 }
 875
 876 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
 877 {
 878         struct fb_info *info = sinfo->info;
 879         int ret = 0;
 880
 881         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
 882
 883         dev_info(info->device,
 884                "%luKiB frame buffer at %08lx (mapped at %p)\n",
 885                (unsigned long)info->fix.smem_len / 1024,
 886                (unsigned long)info->fix.smem_start,
 887                info->screen_base);
 888
 889         /* Allocate colormap */
 890         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 891         if (ret < 0)
 892                 dev_err(info->device, "Alloc color map failed\n");
 893
 894         return ret;
 895 }
 896
 897 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
 898 {
 899         clk_enable(sinfo->bus_clk);
 900         clk_enable(sinfo->lcdc_clk);
 901 }
 902
 903 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
 904 {
 905         clk_disable(sinfo->bus_clk);
 906         clk_disable(sinfo->lcdc_clk);
 907 }
 908
 909
 910 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
 911 {
 912         struct device *dev = &pdev->dev;
 913         struct fb_info *info;
 914         struct atmel_lcdfb_info *sinfo;
 915         struct atmel_lcdfb_info *pdata_sinfo;
 916         struct fb_videomode fbmode;
 917         struct resource *regs = NULL;
 918         struct resource *map = NULL;
 919         int ret;
 920
 921         dev_dbg(dev, "%s BEGIN\n", __func__);
 922
 923         ret = -ENOMEM;
 924         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
 925         if (!info) {
 926                 dev_err(dev, "cannot allocate memory\n");
 927                 goto out;
 928         }
 929
 930         sinfo = info->par;
 931
 932         if (dev->platform_data) {
 933                 pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data;
 934                 sinfo->default_bpp = pdata_sinfo->default_bpp;
 935                 sinfo->default_dmacon = pdata_sinfo->default_dmacon;
 936                 sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2;
 937                 sinfo->default_monspecs = pdata_sinfo->default_monspecs;
 938                 sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
 939                 sinfo->guard_time = pdata_sinfo->guard_time;
 940                 sinfo->smem_len = pdata_sinfo->smem_len;
 941                 sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
 942                 sinfo->lcdcon_pol_negative = pdata_sinfo->lcdcon_pol_negative;
 943                 sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
 944         } else {
 945                 dev_err(dev, "cannot get default configuration\n");
 946                 goto free_info;
 947         }
 948         sinfo->info = info;
 949         sinfo->pdev = pdev;
 950         sinfo->config = atmel_lcdfb_get_config(pdev);
 951         if (!sinfo->config)
 952                 goto free_info;
 953
 954         strcpy(info->fix.id, sinfo->pdev->name);
 955         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
 956         info->pseudo_palette = sinfo->pseudo_palette;
 957         info->fbops = &atmel_lcdfb_ops;
 958
 959         memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs));
 960         info->fix = atmel_lcdfb_fix;
 961
 962         /* Enable LCDC Clocks */
 963         sinfo->bus_clk = clk_get(dev, "hclk");
 964         if (IS_ERR(sinfo->bus_clk)) {
 965                 ret = PTR_ERR(sinfo->bus_clk);
 966                 goto free_info;
 967         }
 968         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
 969         if (IS_ERR(sinfo->lcdc_clk)) {
 970                 ret = PTR_ERR(sinfo->lcdc_clk);
 971                 goto put_bus_clk;
 972         }
 973         atmel_lcdfb_start_clock(sinfo);
 974
 975         ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
 976                         info->monspecs.modedb_len, info->monspecs.modedb,
 977                         sinfo->default_bpp);
 978         if (!ret) {
 979                 dev_err(dev, "no suitable video mode found\n");
 980                 goto stop_clk;
 981         }
 982
 983
 984         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 985         if (!regs) {
 986                 dev_err(dev, "resources unusable\n");
 987                 ret = -ENXIO;
 988                 goto stop_clk;
 989         }
 990
 991         sinfo->irq_base = platform_get_irq(pdev, 0);
 992         if (sinfo->irq_base < 0) {
 993                 dev_err(dev, "unable to get irq\n");
 994                 ret = sinfo->irq_base;
 995                 goto stop_clk;
 996         }
 997
 998         /* Initialize video memory */
 999         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1000         if (map) {
1001                 /* use a pre-allocated memory buffer */
1002                 info->fix.smem_start = map->start;
1003                 info->fix.smem_len = resource_size(map);
1004                 if (!request_mem_region(info->fix.smem_start,
1005                                         info->fix.smem_len, pdev->name)) {
1006                         ret = -EBUSY;
1007                         goto stop_clk;
1008                 }
1009
1010                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1011                 if (!info->screen_base) {
1012                         ret = -ENOMEM;
1013                         goto release_intmem;
1014                 }
1015
1016                 /*
1017                  * Don't clear the framebuffer -- someone may have set
1018                  * up a splash image.
1019                  */
1020         } else {
1021                 /* allocate memory buffer */
1022                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
1023                 if (ret < 0) {
1024                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
1025                         goto stop_clk;
1026                 }
1027         }
1028
1029         /* LCDC registers */
1030         info->fix.mmio_start = regs->start;
1031         info->fix.mmio_len = resource_size(regs);
1032
1033         if (!request_mem_region(info->fix.mmio_start,
1034                                 info->fix.mmio_len, pdev->name)) {
1035                 ret = -EBUSY;
1036                 goto free_fb;
1037         }
1038
1039         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
1040         if (!sinfo->mmio) {
1041                 dev_err(dev, "cannot map LCDC registers\n");
1042                 ret = -ENOMEM;
1043                 goto release_mem;
1044         }
1045
1046         /* Initialize PWM for contrast or backlight ("off") */
1047         init_contrast(sinfo);
1048
1049         /* interrupt */
1050         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
1051         if (ret) {
1052                 dev_err(dev, "request_irq failed: %d\n", ret);
1053                 goto unmap_mmio;
1054         }
1055
1056         /* Some operations on the LCDC might sleep and
1057          * require a preemptible task context */
1058         INIT_WORK(&sinfo->task, atmel_lcdfb_task);
1059
1060         ret = atmel_lcdfb_init_fbinfo(sinfo);
1061         if (ret < 0) {
1062                 dev_err(dev, "init fbinfo failed: %d\n", ret);
1063                 goto unregister_irqs;
1064         }
1065
1066         /*
1067          * This makes sure that our colour bitfield
1068          * descriptors are correctly initialised.
1069          */
1070         atmel_lcdfb_check_var(&info->var, info);
1071
1072         ret = fb_set_var(info, &info->var);
1073         if (ret) {
1074                 dev_warn(dev, "unable to set display parameters\n");
1075                 goto free_cmap;
1076         }
1077
1078         dev_set_drvdata(dev, info);
1079
1080         /*
1081          * Tell the world that we're ready to go
1082          */
1083         ret = register_framebuffer(info);
1084         if (ret < 0) {
1085                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
1086                 goto reset_drvdata;
1087         }
1088
1089         /* add selected videomode to modelist */
1090         fb_var_to_videomode(&fbmode, &info->var);
1091         fb_add_videomode(&fbmode, &info->modelist);
1092
1093         /* Power up the LCDC screen */
1094         if (sinfo->atmel_lcdfb_power_control)
1095                 sinfo->atmel_lcdfb_power_control(1);
1096
1097         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1098                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
1099
1100         return 0;
1101
1102 reset_drvdata:
1103         dev_set_drvdata(dev, NULL);
1104 free_cmap:
1105         fb_dealloc_cmap(&info->cmap);
1106 unregister_irqs:
1107         cancel_work_sync(&sinfo->task);
1108         free_irq(sinfo->irq_base, info);
1109 unmap_mmio:
1110         exit_backlight(sinfo);
1111         iounmap(sinfo->mmio);
1112 release_mem:
1113         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1114 free_fb:
1115         if (map)
1116                 iounmap(info->screen_base);
1117         else
1118                 atmel_lcdfb_free_video_memory(sinfo);
1119
1120 release_intmem:
1121         if (map)
1122                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1123 stop_clk:
1124         atmel_lcdfb_stop_clock(sinfo);
1125         clk_put(sinfo->lcdc_clk);
1126 put_bus_clk:
1127         clk_put(sinfo->bus_clk);
1128 free_info:
1129         framebuffer_release(info);
1130 out:
1131         dev_dbg(dev, "%s FAILED\n", __func__);
1132         return ret;
1133 }
1134
1135 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1136 {
1137         struct device *dev = &pdev->dev;
1138         struct fb_info *info = dev_get_drvdata(dev);
1139         struct atmel_lcdfb_info *sinfo;
1140
1141         if (!info || !info->par)
1142                 return 0;
1143         sinfo = info->par;
1144
1145         cancel_work_sync(&sinfo->task);
1146         exit_backlight(sinfo);
1147         if (sinfo->atmel_lcdfb_power_control)
1148                 sinfo->atmel_lcdfb_power_control(0);
1149         unregister_framebuffer(info);
1150         atmel_lcdfb_stop_clock(sinfo);
1151         clk_put(sinfo->lcdc_clk);
1152         clk_put(sinfo->bus_clk);
1153         fb_dealloc_cmap(&info->cmap);
1154         free_irq(sinfo->irq_base, info);
1155         iounmap(sinfo->mmio);
1156         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1157         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1158                 iounmap(info->screen_base);
1159                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1160         } else {
1161                 atmel_lcdfb_free_video_memory(sinfo);
1162         }
1163
1164         dev_set_drvdata(dev, NULL);
1165         framebuffer_release(info);
1166
1167         return 0;
1168 }
1169
1170 #ifdef CONFIG_PM
1171
1172 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1173 {
1174         struct fb_info *info = platform_get_drvdata(pdev);
1175         struct atmel_lcdfb_info *sinfo = info->par;
1176
1177         /*
1178          * We don't want to handle interrupts while the clock is
1179          * stopped. It may take forever.
1180          */
1181         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1182
1183         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_CTR);
1184         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1185         if (sinfo->atmel_lcdfb_power_control)
1186                 sinfo->atmel_lcdfb_power_control(0);
1187
1188         atmel_lcdfb_stop(sinfo);
1189         atmel_lcdfb_stop_clock(sinfo);
1190
1191         return 0;
1192 }
1193
1194 static int atmel_lcdfb_resume(struct platform_device *pdev)
1195 {
1196         struct fb_info *info = platform_get_drvdata(pdev);
1197         struct atmel_lcdfb_info *sinfo = info->par;
1198
1199         atmel_lcdfb_start_clock(sinfo);
1200         atmel_lcdfb_start(sinfo);
1201         if (sinfo->atmel_lcdfb_power_control)
1202                 sinfo->atmel_lcdfb_power_control(1);
1203         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1204
1205         /* Enable FIFO & DMA errors */
1206         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1207                         | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1208
1209         return 0;
1210 }
1211
1212 #else
1213 #define atmel_lcdfb_suspend     NULL
1214 #define atmel_lcdfb_resume      NULL
1215 #endif
1216
1217 static struct platform_driver atmel_lcdfb_driver = {
1218         .remove         = __exit_p(atmel_lcdfb_remove),
1219         .suspend        = atmel_lcdfb_suspend,
1220         .resume         = atmel_lcdfb_resume,
1221         .id_table       = atmel_lcdfb_devtypes,
1222         .driver         = {
1223                 .name   = "atmel_lcdfb",
1224                 .owner  = THIS_MODULE,
1225         },
1226 };
1227
1228 module_platform_driver_probe(atmel_lcdfb_driver, atmel_lcdfb_probe);
1229
1230 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1231 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1232 MODULE_LICENSE("GPL");