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                 return;
 228
 229         if (sinfo->backlight->ops) {
 230                 sinfo->backlight->props.power = FB_BLANK_POWERDOWN;
 231                 sinfo->backlight->ops->update_status(sinfo->backlight);
 232         }
 233         backlight_device_unregister(sinfo->backlight);
 234 }
 235
 236 #else
 237
 238 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 239 {
 240         dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
 241 }
 242
 243 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 244 {
 245 }
 246
 247 #endif
 248
 249 static void init_contrast(struct atmel_lcdfb_info *sinfo)
 250 {
 251         /* contrast pwm can be 'inverted' */
 252         if (sinfo->lcdcon_pol_negative)
 253                         contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
 254
 255         /* have some default contrast/backlight settings */
 256         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 257         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 258
 259         if (sinfo->lcdcon_is_backlight)
 260                 init_backlight(sinfo);
 261 }
 262
 263
 264 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
 265         .type           = FB_TYPE_PACKED_PIXELS,
 266         .visual         = FB_VISUAL_TRUECOLOR,
 267         .xpanstep       = 0,
 268         .ypanstep       = 1,
 269         .ywrapstep      = 0,
 270         .accel          = FB_ACCEL_NONE,
 271 };
 272
 273 static unsigned long compute_hozval(struct atmel_lcdfb_info *sinfo,
 274                                                         unsigned long xres)
 275 {
 276         unsigned long lcdcon2;
 277         unsigned long value;
 278
 279         if (!sinfo->config->have_hozval)
 280                 return xres;
 281
 282         lcdcon2 = lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2);
 283         value = xres;
 284         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
 285                 /* STN display */
 286                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
 287                         value *= 3;
 288                 }
 289                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
 290                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
 291                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
 292                         value = DIV_ROUND_UP(value, 4);
 293                 else
 294                         value = DIV_ROUND_UP(value, 8);
 295         }
 296
 297         return value;
 298 }
 299
 300 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
 301 {
 302         /* Turn off the LCD controller and the DMA controller */
 303         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 304                         sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
 305
 306         /* Wait for the LCDC core to become idle */
 307         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 308                 msleep(10);
 309
 310         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
 311 }
 312
 313 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
 314 {
 315         atmel_lcdfb_stop_nowait(sinfo);
 316
 317         /* Wait for DMA engine to become idle... */
 318         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 319                 msleep(10);
 320 }
 321
 322 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
 323 {
 324         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon);
 325         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 326                 (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
 327                 | ATMEL_LCDC_PWR);
 328 }
 329
 330 static void atmel_lcdfb_update_dma(struct fb_info *info,
 331                                struct fb_var_screeninfo *var)
 332 {
 333         struct atmel_lcdfb_info *sinfo = info->par;
 334         struct fb_fix_screeninfo *fix = &info->fix;
 335         unsigned long dma_addr;
 336
 337         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
 338                     + var->xoffset * info->var.bits_per_pixel / 8);
 339
 340         dma_addr &= ~3UL;
 341
 342         /* Set framebuffer DMA base address and pixel offset */
 343         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
 344
 345         atmel_lcdfb_update_dma2d(sinfo, var, info);
 346 }
 347
 348 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
 349 {
 350         struct fb_info *info = sinfo->info;
 351
 352         dma_free_writecombine(info->device, info->fix.smem_len,
 353                                 info->screen_base, info->fix.smem_start);
 354 }
 355
 356 /**
 357  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
 358  *      @sinfo: the frame buffer to allocate memory for
 359  *
 360  *      This function is called only from the atmel_lcdfb_probe()
 361  *      so no locking by fb_info->mm_lock around smem_len setting is needed.
 362  */
 363 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
 364 {
 365         struct fb_info *info = sinfo->info;
 366         struct fb_var_screeninfo *var = &info->var;
 367         unsigned int smem_len;
 368
 369         smem_len = (var->xres_virtual * var->yres_virtual
 370                     * ((var->bits_per_pixel + 7) / 8));
 371         info->fix.smem_len = max(smem_len, sinfo->smem_len);
 372
 373         info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
 374                                         (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
 375
 376         if (!info->screen_base) {
 377                 return -ENOMEM;
 378         }
 379
 380         memset(info->screen_base, 0, info->fix.smem_len);
 381
 382         return 0;
 383 }
 384
 385 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
 386                                                      struct fb_info *info)
 387 {
 388         struct fb_videomode varfbmode;
 389         const struct fb_videomode *fbmode = NULL;
 390
 391         fb_var_to_videomode(&varfbmode, var);
 392         fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
 393         if (fbmode)
 394                 fb_videomode_to_var(var, fbmode);
 395         return fbmode;
 396 }
 397
 398
 399 /**
 400  *      atmel_lcdfb_check_var - Validates a var passed in.
 401  *      @var: frame buffer variable screen structure
 402  *      @info: frame buffer structure that represents a single frame buffer
 403  *
 404  *      Checks to see if the hardware supports the state requested by
 405  *      var passed in. This function does not alter the hardware
 406  *      state!!!  This means the data stored in struct fb_info and
 407  *      struct atmel_lcdfb_info do not change. This includes the var
 408  *      inside of struct fb_info.  Do NOT change these. This function
 409  *      can be called on its own if we intent to only test a mode and
 410  *      not actually set it. The stuff in modedb.c is a example of
 411  *      this. If the var passed in is slightly off by what the
 412  *      hardware can support then we alter the var PASSED in to what
 413  *      we can do. If the hardware doesn't support mode change a
 414  *      -EINVAL will be returned by the upper layers. You don't need
 415  *      to implement this function then. If you hardware doesn't
 416  *      support changing the resolution then this function is not
 417  *      needed. In this case the driver would just provide a var that
 418  *      represents the static state the screen is in.
 419  *
 420  *      Returns negative errno on error, or zero on success.
 421  */
 422 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
 423                              struct fb_info *info)
 424 {
 425         struct device *dev = info->device;
 426         struct atmel_lcdfb_info *sinfo = info->par;
 427         unsigned long clk_value_khz;
 428
 429         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 430
 431         dev_dbg(dev, "%s:\n", __func__);
 432
 433         if (!(var->pixclock && var->bits_per_pixel)) {
 434                 /* choose a suitable mode if possible */
 435                 if (!atmel_lcdfb_choose_mode(var, info)) {
 436                         dev_err(dev, "needed value not specified\n");
 437                         return -EINVAL;
 438                 }
 439         }
 440
 441         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
 442         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
 443         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
 444         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
 445
 446         if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
 447                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
 448                 return -EINVAL;
 449         }
 450
 451         /* Do not allow to have real resoulution larger than virtual */
 452         if (var->xres > var->xres_virtual)
 453                 var->xres_virtual = var->xres;
 454
 455         if (var->yres > var->yres_virtual)
 456                 var->yres_virtual = var->yres;
 457
 458         /* Force same alignment for each line */
 459         var->xres = (var->xres + 3) & ~3UL;
 460         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
 461
 462         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
 463         var->transp.msb_right = 0;
 464         var->transp.offset = var->transp.length = 0;
 465         var->xoffset = var->yoffset = 0;
 466
 467         if (info->fix.smem_len) {
 468                 unsigned int smem_len = (var->xres_virtual * var->yres_virtual
 469                                          * ((var->bits_per_pixel + 7) / 8));
 470                 if (smem_len > info->fix.smem_len) {
 471                         dev_err(dev, "Frame buffer is too small (%u) for screen size (need at least %u)\n",
 472                                 info->fix.smem_len, smem_len);
 473                         return -EINVAL;
 474                 }
 475         }
 476
 477         /* Saturate vertical and horizontal timings at maximum values */
 478         var->vsync_len = min_t(u32, var->vsync_len,
 479                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
 480         var->upper_margin = min_t(u32, var->upper_margin,
 481                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
 482         var->lower_margin = min_t(u32, var->lower_margin,
 483                         ATMEL_LCDC_VFP);
 484         var->right_margin = min_t(u32, var->right_margin,
 485                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
 486         var->hsync_len = min_t(u32, var->hsync_len,
 487                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
 488         var->left_margin = min_t(u32, var->left_margin,
 489                         ATMEL_LCDC_HBP + 1);
 490
 491         /* Some parameters can't be zero */
 492         var->vsync_len = max_t(u32, var->vsync_len, 1);
 493         var->right_margin = max_t(u32, var->right_margin, 1);
 494         var->hsync_len = max_t(u32, var->hsync_len, 1);
 495         var->left_margin = max_t(u32, var->left_margin, 1);
 496
 497         switch (var->bits_per_pixel) {
 498         case 1:
 499         case 2:
 500         case 4:
 501         case 8:
 502                 var->red.offset = var->green.offset = var->blue.offset = 0;
 503                 var->red.length = var->green.length = var->blue.length
 504                         = var->bits_per_pixel;
 505                 break;
 506         case 16:
 507                 /* Older SOCs use IBGR:555 rather than BGR:565. */
 508                 if (sinfo->config->have_intensity_bit)
 509                         var->green.length = 5;
 510                 else
 511                         var->green.length = 6;
 512
 513                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 514                         /* RGB:5X5 mode */
 515                         var->red.offset = var->green.length + 5;
 516                         var->blue.offset = 0;
 517                 } else {
 518                         /* BGR:5X5 mode */
 519                         var->red.offset = 0;
 520                         var->blue.offset = var->green.length + 5;
 521                 }
 522                 var->green.offset = 5;
 523                 var->red.length = var->blue.length = 5;
 524                 break;
 525         case 32:
 526                 var->transp.offset = 24;
 527                 var->transp.length = 8;
 528                 /* fall through */
 529         case 24:
 530                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 531                         /* RGB:888 mode */
 532                         var->red.offset = 16;
 533                         var->blue.offset = 0;
 534                 } else {
 535                         /* BGR:888 mode */
 536                         var->red.offset = 0;
 537                         var->blue.offset = 16;
 538                 }
 539                 var->green.offset = 8;
 540                 var->red.length = var->green.length = var->blue.length = 8;
 541                 break;
 542         default:
 543                 dev_err(dev, "color depth %d not supported\n",
 544                                         var->bits_per_pixel);
 545                 return -EINVAL;
 546         }
 547
 548         return 0;
 549 }
 550
 551 /*
 552  * LCD reset sequence
 553  */
 554 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
 555 {
 556         might_sleep();
 557
 558         atmel_lcdfb_stop(sinfo);
 559         atmel_lcdfb_start(sinfo);
 560 }
 561
 562 /**
 563  *      atmel_lcdfb_set_par - Alters the hardware state.
 564  *      @info: frame buffer structure that represents a single frame buffer
 565  *
 566  *      Using the fb_var_screeninfo in fb_info we set the resolution
 567  *      of the this particular framebuffer. This function alters the
 568  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
 569  *      not alter var in fb_info since we are using that data. This
 570  *      means we depend on the data in var inside fb_info to be
 571  *      supported by the hardware.  atmel_lcdfb_check_var is always called
 572  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
 573  *      change the resolution you don't need this function.
 574  *
 575  */
 576 static int atmel_lcdfb_set_par(struct fb_info *info)
 577 {
 578         struct atmel_lcdfb_info *sinfo = info->par;
 579         unsigned long hozval_linesz;
 580         unsigned long value;
 581         unsigned long clk_value_khz;
 582         unsigned long bits_per_line;
 583         unsigned long pix_factor = 2;
 584
 585         might_sleep();
 586
 587         dev_dbg(info->device, "%s:\n", __func__);
 588         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
 589                  info->var.xres, info->var.yres,
 590                  info->var.xres_virtual, info->var.yres_virtual);
 591
 592         atmel_lcdfb_stop_nowait(sinfo);
 593
 594         if (info->var.bits_per_pixel == 1)
 595                 info->fix.visual = FB_VISUAL_MONO01;
 596         else if (info->var.bits_per_pixel <= 8)
 597                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 598         else
 599                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 600
 601         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
 602         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
 603
 604         /* Re-initialize the DMA engine... */
 605         dev_dbg(info->device, "  * update DMA engine\n");
 606         atmel_lcdfb_update_dma(info, &info->var);
 607
 608         /* ...set frame size and burst length = 8 words (?) */
 609         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
 610         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 611         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
 612
 613         /* Now, the LCDC core... */
 614
 615         /* Set pixel clock */
 616         if (sinfo->config->have_alt_pixclock)
 617                 pix_factor = 1;
 618
 619         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 620
 621         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
 622
 623         if (value < pix_factor) {
 624                 dev_notice(info->device, "Bypassing pixel clock divider\n");
 625                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 626         } else {
 627                 value = (value / pix_factor) - 1;
 628                 dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
 629                                 value);
 630                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
 631                                 value << ATMEL_LCDC_CLKVAL_OFFSET);
 632                 info->var.pixclock =
 633                         KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1)));
 634                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
 635                                         PICOS2KHZ(info->var.pixclock));
 636         }
 637
 638
 639         /* Initialize control register 2 */
 640         value = sinfo->default_lcdcon2;
 641
 642         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
 643                 value |= ATMEL_LCDC_INVLINE_INVERTED;
 644         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
 645                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
 646
 647         switch (info->var.bits_per_pixel) {
 648                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
 649                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
 650                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
 651                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
 652                 case 15: /* fall through */
 653                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
 654                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
 655                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
 656                 default: BUG(); break;
 657         }
 658         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
 659         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
 660
 661         /* Vertical timing */
 662         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 663         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
 664         value |= info->var.lower_margin;
 665         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
 666         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
 667
 668         /* Horizontal timing */
 669         value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 670         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 671         value |= (info->var.left_margin - 1);
 672         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
 673         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
 674
 675         /* Horizontal value (aka line size) */
 676         hozval_linesz = compute_hozval(sinfo, info->var.xres);
 677
 678         /* Display size */
 679         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 680         value |= info->var.yres - 1;
 681         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
 682         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
 683
 684         /* FIFO Threshold: Use formula from data sheet */
 685         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 686         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
 687
 688         /* Toggle LCD_MODE every frame */
 689         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
 690
 691         /* Disable all interrupts */
 692         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
 693         /* Enable FIFO & DMA errors */
 694         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
 695
 696         /* ...wait for DMA engine to become idle... */
 697         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 698                 msleep(10);
 699
 700         atmel_lcdfb_start(sinfo);
 701
 702         dev_dbg(info->device, "  * DONE\n");
 703
 704         return 0;
 705 }
 706
 707 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
 708 {
 709         chan &= 0xffff;
 710         chan >>= 16 - bf->length;
 711         return chan << bf->offset;
 712 }
 713
 714 /**
 715  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
 716  *      @regno: Which register in the CLUT we are programming
 717  *      @red: The red value which can be up to 16 bits wide
 718  *      @green: The green value which can be up to 16 bits wide
 719  *      @blue:  The blue value which can be up to 16 bits wide.
 720  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 721  *      @info: frame buffer info structure
 722  *
 723  *      Set a single color register. The values supplied have a 16 bit
 724  *      magnitude which needs to be scaled in this function for the hardware.
 725  *      Things to take into consideration are how many color registers, if
 726  *      any, are supported with the current color visual. With truecolor mode
 727  *      no color palettes are supported. Here a pseudo palette is created
 728  *      which we store the value in pseudo_palette in struct fb_info. For
 729  *      pseudocolor mode we have a limited color palette. To deal with this
 730  *      we can program what color is displayed for a particular pixel value.
 731  *      DirectColor is similar in that we can program each color field. If
 732  *      we have a static colormap we don't need to implement this function.
 733  *
 734  *      Returns negative errno on error, or zero on success. In an
 735  *      ideal world, this would have been the case, but as it turns
 736  *      out, the other drivers return 1 on failure, so that's what
 737  *      we're going to do.
 738  */
 739 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
 740                              unsigned int green, unsigned int blue,
 741                              unsigned int transp, struct fb_info *info)
 742 {
 743         struct atmel_lcdfb_info *sinfo = info->par;
 744         unsigned int val;
 745         u32 *pal;
 746         int ret = 1;
 747
 748         if (info->var.grayscale)
 749                 red = green = blue = (19595 * red + 38470 * green
 750                                       + 7471 * blue) >> 16;
 751
 752         switch (info->fix.visual) {
 753         case FB_VISUAL_TRUECOLOR:
 754                 if (regno < 16) {
 755                         pal = info->pseudo_palette;
 756
 757                         val  = chan_to_field(red, &info->var.red);
 758                         val |= chan_to_field(green, &info->var.green);
 759                         val |= chan_to_field(blue, &info->var.blue);
 760
 761                         pal[regno] = val;
 762                         ret = 0;
 763                 }
 764                 break;
 765
 766         case FB_VISUAL_PSEUDOCOLOR:
 767                 if (regno < 256) {
 768                         if (sinfo->config->have_intensity_bit) {
 769                                 /* old style I+BGR:555 */
 770                                 val  = ((red   >> 11) & 0x001f);
 771                                 val |= ((green >>  6) & 0x03e0);
 772                                 val |= ((blue  >>  1) & 0x7c00);
 773
 774                                 /*
 775                                  * TODO: intensity bit. Maybe something like
 776                                  *   ~(red[10] ^ green[10] ^ blue[10]) & 1
 777                                  */
 778                         } else {
 779                                 /* new style BGR:565 / RGB:565 */
 780                                 if (sinfo->lcd_wiring_mode ==
 781                                     ATMEL_LCDC_WIRING_RGB) {
 782                                         val  = ((blue >> 11) & 0x001f);
 783                                         val |= ((red  >>  0) & 0xf800);
 784                                 } else {
 785                                         val  = ((red  >> 11) & 0x001f);
 786                                         val |= ((blue >>  0) & 0xf800);
 787                                 }
 788
 789                                 val |= ((green >>  5) & 0x07e0);
 790                         }
 791
 792                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 793                         ret = 0;
 794                 }
 795                 break;
 796
 797         case FB_VISUAL_MONO01:
 798                 if (regno < 2) {
 799                         val = (regno == 0) ? 0x00 : 0x1F;
 800                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 801                         ret = 0;
 802                 }
 803                 break;
 804
 805         }
 806
 807         return ret;
 808 }
 809
 810 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
 811                                struct fb_info *info)
 812 {
 813         dev_dbg(info->device, "%s\n", __func__);
 814
 815         atmel_lcdfb_update_dma(info, var);
 816
 817         return 0;
 818 }
 819
 820 static int atmel_lcdfb_blank(int blank_mode, struct fb_info *info)
 821 {
 822         struct atmel_lcdfb_info *sinfo = info->par;
 823
 824         switch (blank_mode) {
 825         case FB_BLANK_UNBLANK:
 826         case FB_BLANK_NORMAL:
 827                 atmel_lcdfb_start(sinfo);
 828                 break;
 829         case FB_BLANK_VSYNC_SUSPEND:
 830         case FB_BLANK_HSYNC_SUSPEND:
 831                 break;
 832         case FB_BLANK_POWERDOWN:
 833                 atmel_lcdfb_stop(sinfo);
 834                 break;
 835         default:
 836                 return -EINVAL;
 837         }
 838
 839         /* let fbcon do a soft blank for us */
 840         return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
 841 }
 842
 843 static struct fb_ops atmel_lcdfb_ops = {
 844         .owner          = THIS_MODULE,
 845         .fb_check_var   = atmel_lcdfb_check_var,
 846         .fb_set_par     = atmel_lcdfb_set_par,
 847         .fb_setcolreg   = atmel_lcdfb_setcolreg,
 848         .fb_blank       = atmel_lcdfb_blank,
 849         .fb_pan_display = atmel_lcdfb_pan_display,
 850         .fb_fillrect    = cfb_fillrect,
 851         .fb_copyarea    = cfb_copyarea,
 852         .fb_imageblit   = cfb_imageblit,
 853 };
 854
 855 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
 856 {
 857         struct fb_info *info = dev_id;
 858         struct atmel_lcdfb_info *sinfo = info->par;
 859         u32 status;
 860
 861         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
 862         if (status & ATMEL_LCDC_UFLWI) {
 863                 dev_warn(info->device, "FIFO underflow %#x\n", status);
 864                 /* reset DMA and FIFO to avoid screen shifting */
 865                 schedule_work(&sinfo->task);
 866         }
 867         lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
 868         return IRQ_HANDLED;
 869 }
 870
 871 /*
 872  * LCD controller task (to reset the LCD)
 873  */
 874 static void atmel_lcdfb_task(struct work_struct *work)
 875 {
 876         struct atmel_lcdfb_info *sinfo =
 877                 container_of(work, struct atmel_lcdfb_info, task);
 878
 879         atmel_lcdfb_reset(sinfo);
 880 }
 881
 882 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
 883 {
 884         struct fb_info *info = sinfo->info;
 885         int ret = 0;
 886
 887         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
 888
 889         dev_info(info->device,
 890                "%luKiB frame buffer at %08lx (mapped at %p)\n",
 891                (unsigned long)info->fix.smem_len / 1024,
 892                (unsigned long)info->fix.smem_start,
 893                info->screen_base);
 894
 895         /* Allocate colormap */
 896         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 897         if (ret < 0)
 898                 dev_err(info->device, "Alloc color map failed\n");
 899
 900         return ret;
 901 }
 902
 903 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
 904 {
 905         clk_enable(sinfo->bus_clk);
 906         clk_enable(sinfo->lcdc_clk);
 907 }
 908
 909 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
 910 {
 911         clk_disable(sinfo->bus_clk);
 912         clk_disable(sinfo->lcdc_clk);
 913 }
 914
 915
 916 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
 917 {
 918         struct device *dev = &pdev->dev;
 919         struct fb_info *info;
 920         struct atmel_lcdfb_info *sinfo;
 921         struct atmel_lcdfb_info *pdata_sinfo;
 922         struct fb_videomode fbmode;
 923         struct resource *regs = NULL;
 924         struct resource *map = NULL;
 925         int ret;
 926
 927         dev_dbg(dev, "%s BEGIN\n", __func__);
 928
 929         ret = -ENOMEM;
 930         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
 931         if (!info) {
 932                 dev_err(dev, "cannot allocate memory\n");
 933                 goto out;
 934         }
 935
 936         sinfo = info->par;
 937
 938         if (dev->platform_data) {
 939                 pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data;
 940                 sinfo->default_bpp = pdata_sinfo->default_bpp;
 941                 sinfo->default_dmacon = pdata_sinfo->default_dmacon;
 942                 sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2;
 943                 sinfo->default_monspecs = pdata_sinfo->default_monspecs;
 944                 sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
 945                 sinfo->guard_time = pdata_sinfo->guard_time;
 946                 sinfo->smem_len = pdata_sinfo->smem_len;
 947                 sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
 948                 sinfo->lcdcon_pol_negative = pdata_sinfo->lcdcon_pol_negative;
 949                 sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
 950         } else {
 951                 dev_err(dev, "cannot get default configuration\n");
 952                 goto free_info;
 953         }
 954         sinfo->info = info;
 955         sinfo->pdev = pdev;
 956         sinfo->config = atmel_lcdfb_get_config(pdev);
 957         if (!sinfo->config)
 958                 goto free_info;
 959
 960         strcpy(info->fix.id, sinfo->pdev->name);
 961         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
 962         info->pseudo_palette = sinfo->pseudo_palette;
 963         info->fbops = &atmel_lcdfb_ops;
 964
 965         memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs));
 966         info->fix = atmel_lcdfb_fix;
 967
 968         /* Enable LCDC Clocks */
 969         sinfo->bus_clk = clk_get(dev, "hclk");
 970         if (IS_ERR(sinfo->bus_clk)) {
 971                 ret = PTR_ERR(sinfo->bus_clk);
 972                 goto free_info;
 973         }
 974         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
 975         if (IS_ERR(sinfo->lcdc_clk)) {
 976                 ret = PTR_ERR(sinfo->lcdc_clk);
 977                 goto put_bus_clk;
 978         }
 979         atmel_lcdfb_start_clock(sinfo);
 980
 981         ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
 982                         info->monspecs.modedb_len, info->monspecs.modedb,
 983                         sinfo->default_bpp);
 984         if (!ret) {
 985                 dev_err(dev, "no suitable video mode found\n");
 986                 goto stop_clk;
 987         }
 988
 989
 990         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 991         if (!regs) {
 992                 dev_err(dev, "resources unusable\n");
 993                 ret = -ENXIO;
 994                 goto stop_clk;
 995         }
 996
 997         sinfo->irq_base = platform_get_irq(pdev, 0);
 998         if (sinfo->irq_base < 0) {
 999                 dev_err(dev, "unable to get irq\n");
1000                 ret = sinfo->irq_base;
1001                 goto stop_clk;
1002         }
1003
1004         /* Initialize video memory */
1005         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1006         if (map) {
1007                 /* use a pre-allocated memory buffer */
1008                 info->fix.smem_start = map->start;
1009                 info->fix.smem_len = resource_size(map);
1010                 if (!request_mem_region(info->fix.smem_start,
1011                                         info->fix.smem_len, pdev->name)) {
1012                         ret = -EBUSY;
1013                         goto stop_clk;
1014                 }
1015
1016                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1017                 if (!info->screen_base) {
1018                         ret = -ENOMEM;
1019                         goto release_intmem;
1020                 }
1021
1022                 /*
1023                  * Don't clear the framebuffer -- someone may have set
1024                  * up a splash image.
1025                  */
1026         } else {
1027                 /* allocate memory buffer */
1028                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
1029                 if (ret < 0) {
1030                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
1031                         goto stop_clk;
1032                 }
1033         }
1034
1035         /* LCDC registers */
1036         info->fix.mmio_start = regs->start;
1037         info->fix.mmio_len = resource_size(regs);
1038
1039         if (!request_mem_region(info->fix.mmio_start,
1040                                 info->fix.mmio_len, pdev->name)) {
1041                 ret = -EBUSY;
1042                 goto free_fb;
1043         }
1044
1045         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
1046         if (!sinfo->mmio) {
1047                 dev_err(dev, "cannot map LCDC registers\n");
1048                 ret = -ENOMEM;
1049                 goto release_mem;
1050         }
1051
1052         /* Initialize PWM for contrast or backlight ("off") */
1053         init_contrast(sinfo);
1054
1055         /* interrupt */
1056         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
1057         if (ret) {
1058                 dev_err(dev, "request_irq failed: %d\n", ret);
1059                 goto unmap_mmio;
1060         }
1061
1062         /* Some operations on the LCDC might sleep and
1063          * require a preemptible task context */
1064         INIT_WORK(&sinfo->task, atmel_lcdfb_task);
1065
1066         ret = atmel_lcdfb_init_fbinfo(sinfo);
1067         if (ret < 0) {
1068                 dev_err(dev, "init fbinfo failed: %d\n", ret);
1069                 goto unregister_irqs;
1070         }
1071
1072         /*
1073          * This makes sure that our colour bitfield
1074          * descriptors are correctly initialised.
1075          */
1076         atmel_lcdfb_check_var(&info->var, info);
1077
1078         ret = fb_set_var(info, &info->var);
1079         if (ret) {
1080                 dev_warn(dev, "unable to set display parameters\n");
1081                 goto free_cmap;
1082         }
1083
1084         dev_set_drvdata(dev, info);
1085
1086         /*
1087          * Tell the world that we're ready to go
1088          */
1089         ret = register_framebuffer(info);
1090         if (ret < 0) {
1091                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
1092                 goto reset_drvdata;
1093         }
1094
1095         /* add selected videomode to modelist */
1096         fb_var_to_videomode(&fbmode, &info->var);
1097         fb_add_videomode(&fbmode, &info->modelist);
1098
1099         /* Power up the LCDC screen */
1100         if (sinfo->atmel_lcdfb_power_control)
1101                 sinfo->atmel_lcdfb_power_control(1);
1102
1103         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1104                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
1105
1106         return 0;
1107
1108 reset_drvdata:
1109         dev_set_drvdata(dev, NULL);
1110 free_cmap:
1111         fb_dealloc_cmap(&info->cmap);
1112 unregister_irqs:
1113         cancel_work_sync(&sinfo->task);
1114         free_irq(sinfo->irq_base, info);
1115 unmap_mmio:
1116         exit_backlight(sinfo);
1117         iounmap(sinfo->mmio);
1118 release_mem:
1119         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1120 free_fb:
1121         if (map)
1122                 iounmap(info->screen_base);
1123         else
1124                 atmel_lcdfb_free_video_memory(sinfo);
1125
1126 release_intmem:
1127         if (map)
1128                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1129 stop_clk:
1130         atmel_lcdfb_stop_clock(sinfo);
1131         clk_put(sinfo->lcdc_clk);
1132 put_bus_clk:
1133         clk_put(sinfo->bus_clk);
1134 free_info:
1135         framebuffer_release(info);
1136 out:
1137         dev_dbg(dev, "%s FAILED\n", __func__);
1138         return ret;
1139 }
1140
1141 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1142 {
1143         struct device *dev = &pdev->dev;
1144         struct fb_info *info = dev_get_drvdata(dev);
1145         struct atmel_lcdfb_info *sinfo;
1146
1147         if (!info || !info->par)
1148                 return 0;
1149         sinfo = info->par;
1150
1151         cancel_work_sync(&sinfo->task);
1152         exit_backlight(sinfo);
1153         if (sinfo->atmel_lcdfb_power_control)
1154                 sinfo->atmel_lcdfb_power_control(0);
1155         unregister_framebuffer(info);
1156         atmel_lcdfb_stop_clock(sinfo);
1157         clk_put(sinfo->lcdc_clk);
1158         clk_put(sinfo->bus_clk);
1159         fb_dealloc_cmap(&info->cmap);
1160         free_irq(sinfo->irq_base, info);
1161         iounmap(sinfo->mmio);
1162         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1163         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1164                 iounmap(info->screen_base);
1165                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1166         } else {
1167                 atmel_lcdfb_free_video_memory(sinfo);
1168         }
1169
1170         dev_set_drvdata(dev, NULL);
1171         framebuffer_release(info);
1172
1173         return 0;
1174 }
1175
1176 #ifdef CONFIG_PM
1177
1178 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1179 {
1180         struct fb_info *info = platform_get_drvdata(pdev);
1181         struct atmel_lcdfb_info *sinfo = info->par;
1182
1183         /*
1184          * We don't want to handle interrupts while the clock is
1185          * stopped. It may take forever.
1186          */
1187         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1188
1189         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_CTR);
1190         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1191         if (sinfo->atmel_lcdfb_power_control)
1192                 sinfo->atmel_lcdfb_power_control(0);
1193
1194         atmel_lcdfb_stop(sinfo);
1195         atmel_lcdfb_stop_clock(sinfo);
1196
1197         return 0;
1198 }
1199
1200 static int atmel_lcdfb_resume(struct platform_device *pdev)
1201 {
1202         struct fb_info *info = platform_get_drvdata(pdev);
1203         struct atmel_lcdfb_info *sinfo = info->par;
1204
1205         atmel_lcdfb_start_clock(sinfo);
1206         atmel_lcdfb_start(sinfo);
1207         if (sinfo->atmel_lcdfb_power_control)
1208                 sinfo->atmel_lcdfb_power_control(1);
1209         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1210
1211         /* Enable FIFO & DMA errors */
1212         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1213                         | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1214
1215         return 0;
1216 }
1217
1218 #else
1219 #define atmel_lcdfb_suspend     NULL
1220 #define atmel_lcdfb_resume      NULL
1221 #endif
1222
1223 static struct platform_driver atmel_lcdfb_driver = {
1224         .remove         = __exit_p(atmel_lcdfb_remove),
1225         .suspend        = atmel_lcdfb_suspend,
1226         .resume         = atmel_lcdfb_resume,
1227         .id_table       = atmel_lcdfb_devtypes,
1228         .driver         = {
1229                 .name   = "atmel_lcdfb",
1230                 .owner  = THIS_MODULE,
1231         },
1232 };
1233
1234 module_platform_driver_probe(atmel_lcdfb_driver, atmel_lcdfb_probe);
1235
1236 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1237 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1238 MODULE_LICENSE("GPL");