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 #include <linux/of.h>
  24 #include <linux/of_device.h>
  25 #include <linux/of_gpio.h>
  26 #include <video/of_display_timing.h>
  27 #include <video/videomode.h>
  28
  29 #include <mach/cpu.h>
  30 #include <asm/gpio.h>
  31
  32 #include <video/atmel_lcdc.h>
  33
  34 struct atmel_lcdfb_config {
  35         bool have_alt_pixclock;
  36         bool have_hozval;
  37         bool have_intensity_bit;
  38 };
  39
  40  /* LCD Controller info data structure, stored in device platform_data */
  41 struct atmel_lcdfb_info {
  42         spinlock_t              lock;
  43         struct fb_info          *info;
  44         void __iomem            *mmio;
  45         int                     irq_base;
  46         struct work_struct      task;
  47
  48         unsigned int            smem_len;
  49         struct platform_device  *pdev;
  50         struct clk              *bus_clk;
  51         struct clk              *lcdc_clk;
  52
  53         struct backlight_device *backlight;
  54         u8                      bl_power;
  55         u8                      saved_lcdcon;
  56
  57         u32                     pseudo_palette[16];
  58         bool                    have_intensity_bit;
  59
  60         struct atmel_lcdfb_pdata pdata;
  61
  62         struct atmel_lcdfb_config *config;
  63 };
  64
  65 struct atmel_lcdfb_power_ctrl_gpio {
  66         int gpio;
  67         int active_low;
  68
  69         struct list_head list;
  70 };
  71
  72 #define lcdc_readl(sinfo, reg)          __raw_readl((sinfo)->mmio+(reg))
  73 #define lcdc_writel(sinfo, reg, val)    __raw_writel((val), (sinfo)->mmio+(reg))
  74
  75 /* configurable parameters */
  76 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
  77 #define ATMEL_LCDC_DMA_BURST_LEN        8       /* words */
  78 #define ATMEL_LCDC_FIFO_SIZE            512     /* words */
  79
  80 static struct atmel_lcdfb_config at91sam9261_config = {
  81         .have_hozval            = true,
  82         .have_intensity_bit     = true,
  83 };
  84
  85 static struct atmel_lcdfb_config at91sam9263_config = {
  86         .have_intensity_bit     = true,
  87 };
  88
  89 static struct atmel_lcdfb_config at91sam9g10_config = {
  90         .have_hozval            = true,
  91 };
  92
  93 static struct atmel_lcdfb_config at91sam9g45_config = {
  94         .have_alt_pixclock      = true,
  95 };
  96
  97 static struct atmel_lcdfb_config at91sam9g45es_config = {
  98 };
  99
 100 static struct atmel_lcdfb_config at91sam9rl_config = {
 101         .have_intensity_bit     = true,
 102 };
 103
 104 static struct atmel_lcdfb_config at32ap_config = {
 105         .have_hozval            = true,
 106 };
 107
 108 static const struct platform_device_id atmel_lcdfb_devtypes[] = {
 109         {
 110                 .name = "at91sam9261-lcdfb",
 111                 .driver_data = (unsigned long)&at91sam9261_config,
 112         }, {
 113                 .name = "at91sam9263-lcdfb",
 114                 .driver_data = (unsigned long)&at91sam9263_config,
 115         }, {
 116                 .name = "at91sam9g10-lcdfb",
 117                 .driver_data = (unsigned long)&at91sam9g10_config,
 118         }, {
 119                 .name = "at91sam9g45-lcdfb",
 120                 .driver_data = (unsigned long)&at91sam9g45_config,
 121         }, {
 122                 .name = "at91sam9g45es-lcdfb",
 123                 .driver_data = (unsigned long)&at91sam9g45es_config,
 124         }, {
 125                 .name = "at91sam9rl-lcdfb",
 126                 .driver_data = (unsigned long)&at91sam9rl_config,
 127         }, {
 128                 .name = "at32ap-lcdfb",
 129                 .driver_data = (unsigned long)&at32ap_config,
 130         }, {
 131                 /* terminator */
 132         }
 133 };
 134
 135 static struct atmel_lcdfb_config *
 136 atmel_lcdfb_get_config(struct platform_device *pdev)
 137 {
 138         unsigned long data;
 139
 140         data = platform_get_device_id(pdev)->driver_data;
 141
 142         return (struct atmel_lcdfb_config *)data;
 143 }
 144
 145 #if defined(CONFIG_ARCH_AT91)
 146 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
 147                                          | FBINFO_PARTIAL_PAN_OK \
 148                                          | FBINFO_HWACCEL_YPAN)
 149
 150 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
 151                                         struct fb_var_screeninfo *var,
 152                                         struct fb_info *info)
 153 {
 154
 155 }
 156 #elif defined(CONFIG_AVR32)
 157 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
 158                                         | FBINFO_PARTIAL_PAN_OK \
 159                                         | FBINFO_HWACCEL_XPAN \
 160                                         | FBINFO_HWACCEL_YPAN)
 161
 162 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
 163                                      struct fb_var_screeninfo *var,
 164                                      struct fb_info *info)
 165 {
 166         u32 dma2dcfg;
 167         u32 pixeloff;
 168
 169         pixeloff = (var->xoffset * info->var.bits_per_pixel) & 0x1f;
 170
 171         dma2dcfg = (info->var.xres_virtual - info->var.xres)
 172                  * info->var.bits_per_pixel / 8;
 173         dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
 174         lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
 175
 176         /* Update configuration */
 177         lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
 178                     lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
 179                     | ATMEL_LCDC_DMAUPDT);
 180 }
 181 #endif
 182
 183 static u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
 184                 | ATMEL_LCDC_POL_POSITIVE
 185                 | ATMEL_LCDC_ENA_PWMENABLE;
 186
 187 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
 188
 189 /* some bl->props field just changed */
 190 static int atmel_bl_update_status(struct backlight_device *bl)
 191 {
 192         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 193         int                     power = sinfo->bl_power;
 194         int                     brightness = bl->props.brightness;
 195
 196         /* REVISIT there may be a meaningful difference between
 197          * fb_blank and power ... there seem to be some cases
 198          * this doesn't handle correctly.
 199          */
 200         if (bl->props.fb_blank != sinfo->bl_power)
 201                 power = bl->props.fb_blank;
 202         else if (bl->props.power != sinfo->bl_power)
 203                 power = bl->props.power;
 204
 205         if (brightness < 0 && power == FB_BLANK_UNBLANK)
 206                 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 207         else if (power != FB_BLANK_UNBLANK)
 208                 brightness = 0;
 209
 210         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
 211         if (contrast_ctr & ATMEL_LCDC_POL_POSITIVE)
 212                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
 213                         brightness ? contrast_ctr : 0);
 214         else
 215                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 216
 217         bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
 218
 219         return 0;
 220 }
 221
 222 static int atmel_bl_get_brightness(struct backlight_device *bl)
 223 {
 224         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 225
 226         return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 227 }
 228
 229 static const struct backlight_ops atmel_lcdc_bl_ops = {
 230         .update_status = atmel_bl_update_status,
 231         .get_brightness = atmel_bl_get_brightness,
 232 };
 233
 234 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 235 {
 236         struct backlight_properties props;
 237         struct backlight_device *bl;
 238
 239         sinfo->bl_power = FB_BLANK_UNBLANK;
 240
 241         if (sinfo->backlight)
 242                 return;
 243
 244         memset(&props, 0, sizeof(struct backlight_properties));
 245         props.type = BACKLIGHT_RAW;
 246         props.max_brightness = 0xff;
 247         bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo,
 248                                        &atmel_lcdc_bl_ops, &props);
 249         if (IS_ERR(bl)) {
 250                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
 251                                 PTR_ERR(bl));
 252                 return;
 253         }
 254         sinfo->backlight = bl;
 255
 256         bl->props.power = FB_BLANK_UNBLANK;
 257         bl->props.fb_blank = FB_BLANK_UNBLANK;
 258         bl->props.brightness = atmel_bl_get_brightness(bl);
 259 }
 260
 261 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 262 {
 263         if (!sinfo->backlight)
 264                 return;
 265
 266         if (sinfo->backlight->ops) {
 267                 sinfo->backlight->props.power = FB_BLANK_POWERDOWN;
 268                 sinfo->backlight->ops->update_status(sinfo->backlight);
 269         }
 270         backlight_device_unregister(sinfo->backlight);
 271 }
 272
 273 #else
 274
 275 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 276 {
 277         dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
 278 }
 279
 280 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 281 {
 282 }
 283
 284 #endif
 285
 286 static void init_contrast(struct atmel_lcdfb_info *sinfo)
 287 {
 288         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 289
 290         /* contrast pwm can be 'inverted' */
 291         if (pdata->lcdcon_pol_negative)
 292                         contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
 293
 294         /* have some default contrast/backlight settings */
 295         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 296         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 297
 298         if (pdata->lcdcon_is_backlight)
 299                 init_backlight(sinfo);
 300 }
 301
 302 static inline void atmel_lcdfb_power_control(struct atmel_lcdfb_info *sinfo, int on)
 303 {
 304         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 305
 306         if (pdata->atmel_lcdfb_power_control)
 307                 pdata->atmel_lcdfb_power_control(pdata, on);
 308 }
 309
 310 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
 311         .type           = FB_TYPE_PACKED_PIXELS,
 312         .visual         = FB_VISUAL_TRUECOLOR,
 313         .xpanstep       = 0,
 314         .ypanstep       = 1,
 315         .ywrapstep      = 0,
 316         .accel          = FB_ACCEL_NONE,
 317 };
 318
 319 static unsigned long compute_hozval(struct atmel_lcdfb_info *sinfo,
 320                                                         unsigned long xres)
 321 {
 322         unsigned long lcdcon2;
 323         unsigned long value;
 324
 325         if (!sinfo->config->have_hozval)
 326                 return xres;
 327
 328         lcdcon2 = lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2);
 329         value = xres;
 330         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
 331                 /* STN display */
 332                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
 333                         value *= 3;
 334                 }
 335                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
 336                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
 337                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
 338                         value = DIV_ROUND_UP(value, 4);
 339                 else
 340                         value = DIV_ROUND_UP(value, 8);
 341         }
 342
 343         return value;
 344 }
 345
 346 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
 347 {
 348         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 349
 350         /* Turn off the LCD controller and the DMA controller */
 351         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 352                         pdata->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
 353
 354         /* Wait for the LCDC core to become idle */
 355         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 356                 msleep(10);
 357
 358         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
 359 }
 360
 361 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
 362 {
 363         atmel_lcdfb_stop_nowait(sinfo);
 364
 365         /* Wait for DMA engine to become idle... */
 366         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 367                 msleep(10);
 368 }
 369
 370 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
 371 {
 372         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 373
 374         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, pdata->default_dmacon);
 375         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 376                 (pdata->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
 377                 | ATMEL_LCDC_PWR);
 378 }
 379
 380 static void atmel_lcdfb_update_dma(struct fb_info *info,
 381                                struct fb_var_screeninfo *var)
 382 {
 383         struct atmel_lcdfb_info *sinfo = info->par;
 384         struct fb_fix_screeninfo *fix = &info->fix;
 385         unsigned long dma_addr;
 386
 387         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
 388                     + var->xoffset * info->var.bits_per_pixel / 8);
 389
 390         dma_addr &= ~3UL;
 391
 392         /* Set framebuffer DMA base address and pixel offset */
 393         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
 394
 395         atmel_lcdfb_update_dma2d(sinfo, var, info);
 396 }
 397
 398 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
 399 {
 400         struct fb_info *info = sinfo->info;
 401
 402         dma_free_writecombine(info->device, info->fix.smem_len,
 403                                 info->screen_base, info->fix.smem_start);
 404 }
 405
 406 /**
 407  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
 408  *      @sinfo: the frame buffer to allocate memory for
 409  *
 410  *      This function is called only from the atmel_lcdfb_probe()
 411  *      so no locking by fb_info->mm_lock around smem_len setting is needed.
 412  */
 413 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
 414 {
 415         struct fb_info *info = sinfo->info;
 416         struct fb_var_screeninfo *var = &info->var;
 417         unsigned int smem_len;
 418
 419         smem_len = (var->xres_virtual * var->yres_virtual
 420                     * ((var->bits_per_pixel + 7) / 8));
 421         info->fix.smem_len = max(smem_len, sinfo->smem_len);
 422
 423         info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
 424                                         (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
 425
 426         if (!info->screen_base) {
 427                 return -ENOMEM;
 428         }
 429
 430         memset(info->screen_base, 0, info->fix.smem_len);
 431
 432         return 0;
 433 }
 434
 435 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
 436                                                      struct fb_info *info)
 437 {
 438         struct fb_videomode varfbmode;
 439         const struct fb_videomode *fbmode = NULL;
 440
 441         fb_var_to_videomode(&varfbmode, var);
 442         fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
 443         if (fbmode)
 444                 fb_videomode_to_var(var, fbmode);
 445         return fbmode;
 446 }
 447
 448
 449 /**
 450  *      atmel_lcdfb_check_var - Validates a var passed in.
 451  *      @var: frame buffer variable screen structure
 452  *      @info: frame buffer structure that represents a single frame buffer
 453  *
 454  *      Checks to see if the hardware supports the state requested by
 455  *      var passed in. This function does not alter the hardware
 456  *      state!!!  This means the data stored in struct fb_info and
 457  *      struct atmel_lcdfb_info do not change. This includes the var
 458  *      inside of struct fb_info.  Do NOT change these. This function
 459  *      can be called on its own if we intent to only test a mode and
 460  *      not actually set it. The stuff in modedb.c is a example of
 461  *      this. If the var passed in is slightly off by what the
 462  *      hardware can support then we alter the var PASSED in to what
 463  *      we can do. If the hardware doesn't support mode change a
 464  *      -EINVAL will be returned by the upper layers. You don't need
 465  *      to implement this function then. If you hardware doesn't
 466  *      support changing the resolution then this function is not
 467  *      needed. In this case the driver would just provide a var that
 468  *      represents the static state the screen is in.
 469  *
 470  *      Returns negative errno on error, or zero on success.
 471  */
 472 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
 473                              struct fb_info *info)
 474 {
 475         struct device *dev = info->device;
 476         struct atmel_lcdfb_info *sinfo = info->par;
 477         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 478         unsigned long clk_value_khz;
 479
 480         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 481
 482         dev_dbg(dev, "%s:\n", __func__);
 483
 484         if (!(var->pixclock && var->bits_per_pixel)) {
 485                 /* choose a suitable mode if possible */
 486                 if (!atmel_lcdfb_choose_mode(var, info)) {
 487                         dev_err(dev, "needed value not specified\n");
 488                         return -EINVAL;
 489                 }
 490         }
 491
 492         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
 493         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
 494         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
 495         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
 496
 497         if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
 498                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
 499                 return -EINVAL;
 500         }
 501
 502         /* Do not allow to have real resoulution larger than virtual */
 503         if (var->xres > var->xres_virtual)
 504                 var->xres_virtual = var->xres;
 505
 506         if (var->yres > var->yres_virtual)
 507                 var->yres_virtual = var->yres;
 508
 509         /* Force same alignment for each line */
 510         var->xres = (var->xres + 3) & ~3UL;
 511         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
 512
 513         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
 514         var->transp.msb_right = 0;
 515         var->transp.offset = var->transp.length = 0;
 516         var->xoffset = var->yoffset = 0;
 517
 518         if (info->fix.smem_len) {
 519                 unsigned int smem_len = (var->xres_virtual * var->yres_virtual
 520                                          * ((var->bits_per_pixel + 7) / 8));
 521                 if (smem_len > info->fix.smem_len) {
 522                         dev_err(dev, "Frame buffer is too small (%u) for screen size (need at least %u)\n",
 523                                 info->fix.smem_len, smem_len);
 524                         return -EINVAL;
 525                 }
 526         }
 527
 528         /* Saturate vertical and horizontal timings at maximum values */
 529         var->vsync_len = min_t(u32, var->vsync_len,
 530                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
 531         var->upper_margin = min_t(u32, var->upper_margin,
 532                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
 533         var->lower_margin = min_t(u32, var->lower_margin,
 534                         ATMEL_LCDC_VFP);
 535         var->right_margin = min_t(u32, var->right_margin,
 536                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
 537         var->hsync_len = min_t(u32, var->hsync_len,
 538                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
 539         var->left_margin = min_t(u32, var->left_margin,
 540                         ATMEL_LCDC_HBP + 1);
 541
 542         /* Some parameters can't be zero */
 543         var->vsync_len = max_t(u32, var->vsync_len, 1);
 544         var->right_margin = max_t(u32, var->right_margin, 1);
 545         var->hsync_len = max_t(u32, var->hsync_len, 1);
 546         var->left_margin = max_t(u32, var->left_margin, 1);
 547
 548         switch (var->bits_per_pixel) {
 549         case 1:
 550         case 2:
 551         case 4:
 552         case 8:
 553                 var->red.offset = var->green.offset = var->blue.offset = 0;
 554                 var->red.length = var->green.length = var->blue.length
 555                         = var->bits_per_pixel;
 556                 break;
 557         case 16:
 558                 /* Older SOCs use IBGR:555 rather than BGR:565. */
 559                 if (sinfo->config->have_intensity_bit)
 560                         var->green.length = 5;
 561                 else
 562                         var->green.length = 6;
 563
 564                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 565                         /* RGB:5X5 mode */
 566                         var->red.offset = var->green.length + 5;
 567                         var->blue.offset = 0;
 568                 } else {
 569                         /* BGR:5X5 mode */
 570                         var->red.offset = 0;
 571                         var->blue.offset = var->green.length + 5;
 572                 }
 573                 var->green.offset = 5;
 574                 var->red.length = var->blue.length = 5;
 575                 break;
 576         case 32:
 577                 var->transp.offset = 24;
 578                 var->transp.length = 8;
 579                 /* fall through */
 580         case 24:
 581                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 582                         /* RGB:888 mode */
 583                         var->red.offset = 16;
 584                         var->blue.offset = 0;
 585                 } else {
 586                         /* BGR:888 mode */
 587                         var->red.offset = 0;
 588                         var->blue.offset = 16;
 589                 }
 590                 var->green.offset = 8;
 591                 var->red.length = var->green.length = var->blue.length = 8;
 592                 break;
 593         default:
 594                 dev_err(dev, "color depth %d not supported\n",
 595                                         var->bits_per_pixel);
 596                 return -EINVAL;
 597         }
 598
 599         return 0;
 600 }
 601
 602 /*
 603  * LCD reset sequence
 604  */
 605 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
 606 {
 607         might_sleep();
 608
 609         atmel_lcdfb_stop(sinfo);
 610         atmel_lcdfb_start(sinfo);
 611 }
 612
 613 /**
 614  *      atmel_lcdfb_set_par - Alters the hardware state.
 615  *      @info: frame buffer structure that represents a single frame buffer
 616  *
 617  *      Using the fb_var_screeninfo in fb_info we set the resolution
 618  *      of the this particular framebuffer. This function alters the
 619  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
 620  *      not alter var in fb_info since we are using that data. This
 621  *      means we depend on the data in var inside fb_info to be
 622  *      supported by the hardware.  atmel_lcdfb_check_var is always called
 623  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
 624  *      change the resolution you don't need this function.
 625  *
 626  */
 627 static int atmel_lcdfb_set_par(struct fb_info *info)
 628 {
 629         struct atmel_lcdfb_info *sinfo = info->par;
 630         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 631         unsigned long hozval_linesz;
 632         unsigned long value;
 633         unsigned long clk_value_khz;
 634         unsigned long bits_per_line;
 635         unsigned long pix_factor = 2;
 636
 637         might_sleep();
 638
 639         dev_dbg(info->device, "%s:\n", __func__);
 640         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
 641                  info->var.xres, info->var.yres,
 642                  info->var.xres_virtual, info->var.yres_virtual);
 643
 644         atmel_lcdfb_stop_nowait(sinfo);
 645
 646         if (info->var.bits_per_pixel == 1)
 647                 info->fix.visual = FB_VISUAL_MONO01;
 648         else if (info->var.bits_per_pixel <= 8)
 649                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 650         else
 651                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 652
 653         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
 654         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
 655
 656         /* Re-initialize the DMA engine... */
 657         dev_dbg(info->device, "  * update DMA engine\n");
 658         atmel_lcdfb_update_dma(info, &info->var);
 659
 660         /* ...set frame size and burst length = 8 words (?) */
 661         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
 662         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 663         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
 664
 665         /* Now, the LCDC core... */
 666
 667         /* Set pixel clock */
 668         if (sinfo->config->have_alt_pixclock)
 669                 pix_factor = 1;
 670
 671         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 672
 673         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
 674
 675         if (value < pix_factor) {
 676                 dev_notice(info->device, "Bypassing pixel clock divider\n");
 677                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 678         } else {
 679                 value = (value / pix_factor) - 1;
 680                 dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
 681                                 value);
 682                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
 683                                 value << ATMEL_LCDC_CLKVAL_OFFSET);
 684                 info->var.pixclock =
 685                         KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1)));
 686                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
 687                                         PICOS2KHZ(info->var.pixclock));
 688         }
 689
 690
 691         /* Initialize control register 2 */
 692         value = pdata->default_lcdcon2;
 693
 694         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
 695                 value |= ATMEL_LCDC_INVLINE_INVERTED;
 696         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
 697                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
 698
 699         switch (info->var.bits_per_pixel) {
 700                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
 701                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
 702                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
 703                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
 704                 case 15: /* fall through */
 705                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
 706                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
 707                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
 708                 default: BUG(); break;
 709         }
 710         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
 711         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
 712
 713         /* Vertical timing */
 714         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 715         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
 716         value |= info->var.lower_margin;
 717         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
 718         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
 719
 720         /* Horizontal timing */
 721         value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 722         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 723         value |= (info->var.left_margin - 1);
 724         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
 725         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
 726
 727         /* Horizontal value (aka line size) */
 728         hozval_linesz = compute_hozval(sinfo, info->var.xres);
 729
 730         /* Display size */
 731         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 732         value |= info->var.yres - 1;
 733         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
 734         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
 735
 736         /* FIFO Threshold: Use formula from data sheet */
 737         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 738         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
 739
 740         /* Toggle LCD_MODE every frame */
 741         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
 742
 743         /* Disable all interrupts */
 744         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
 745         /* Enable FIFO & DMA errors */
 746         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
 747
 748         /* ...wait for DMA engine to become idle... */
 749         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 750                 msleep(10);
 751
 752         atmel_lcdfb_start(sinfo);
 753
 754         dev_dbg(info->device, "  * DONE\n");
 755
 756         return 0;
 757 }
 758
 759 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
 760 {
 761         chan &= 0xffff;
 762         chan >>= 16 - bf->length;
 763         return chan << bf->offset;
 764 }
 765
 766 /**
 767  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
 768  *      @regno: Which register in the CLUT we are programming
 769  *      @red: The red value which can be up to 16 bits wide
 770  *      @green: The green value which can be up to 16 bits wide
 771  *      @blue:  The blue value which can be up to 16 bits wide.
 772  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 773  *      @info: frame buffer info structure
 774  *
 775  *      Set a single color register. The values supplied have a 16 bit
 776  *      magnitude which needs to be scaled in this function for the hardware.
 777  *      Things to take into consideration are how many color registers, if
 778  *      any, are supported with the current color visual. With truecolor mode
 779  *      no color palettes are supported. Here a pseudo palette is created
 780  *      which we store the value in pseudo_palette in struct fb_info. For
 781  *      pseudocolor mode we have a limited color palette. To deal with this
 782  *      we can program what color is displayed for a particular pixel value.
 783  *      DirectColor is similar in that we can program each color field. If
 784  *      we have a static colormap we don't need to implement this function.
 785  *
 786  *      Returns negative errno on error, or zero on success. In an
 787  *      ideal world, this would have been the case, but as it turns
 788  *      out, the other drivers return 1 on failure, so that's what
 789  *      we're going to do.
 790  */
 791 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
 792                              unsigned int green, unsigned int blue,
 793                              unsigned int transp, struct fb_info *info)
 794 {
 795         struct atmel_lcdfb_info *sinfo = info->par;
 796         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 797         unsigned int val;
 798         u32 *pal;
 799         int ret = 1;
 800
 801         if (info->var.grayscale)
 802                 red = green = blue = (19595 * red + 38470 * green
 803                                       + 7471 * blue) >> 16;
 804
 805         switch (info->fix.visual) {
 806         case FB_VISUAL_TRUECOLOR:
 807                 if (regno < 16) {
 808                         pal = info->pseudo_palette;
 809
 810                         val  = chan_to_field(red, &info->var.red);
 811                         val |= chan_to_field(green, &info->var.green);
 812                         val |= chan_to_field(blue, &info->var.blue);
 813
 814                         pal[regno] = val;
 815                         ret = 0;
 816                 }
 817                 break;
 818
 819         case FB_VISUAL_PSEUDOCOLOR:
 820                 if (regno < 256) {
 821                         if (sinfo->config->have_intensity_bit) {
 822                                 /* old style I+BGR:555 */
 823                                 val  = ((red   >> 11) & 0x001f);
 824                                 val |= ((green >>  6) & 0x03e0);
 825                                 val |= ((blue  >>  1) & 0x7c00);
 826
 827                                 /*
 828                                  * TODO: intensity bit. Maybe something like
 829                                  *   ~(red[10] ^ green[10] ^ blue[10]) & 1
 830                                  */
 831                         } else {
 832                                 /* new style BGR:565 / RGB:565 */
 833                                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 834                                         val  = ((blue >> 11) & 0x001f);
 835                                         val |= ((red  >>  0) & 0xf800);
 836                                 } else {
 837                                         val  = ((red  >> 11) & 0x001f);
 838                                         val |= ((blue >>  0) & 0xf800);
 839                                 }
 840
 841                                 val |= ((green >>  5) & 0x07e0);
 842                         }
 843
 844                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 845                         ret = 0;
 846                 }
 847                 break;
 848
 849         case FB_VISUAL_MONO01:
 850                 if (regno < 2) {
 851                         val = (regno == 0) ? 0x00 : 0x1F;
 852                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 853                         ret = 0;
 854                 }
 855                 break;
 856
 857         }
 858
 859         return ret;
 860 }
 861
 862 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
 863                                struct fb_info *info)
 864 {
 865         dev_dbg(info->device, "%s\n", __func__);
 866
 867         atmel_lcdfb_update_dma(info, var);
 868
 869         return 0;
 870 }
 871
 872 static int atmel_lcdfb_blank(int blank_mode, struct fb_info *info)
 873 {
 874         struct atmel_lcdfb_info *sinfo = info->par;
 875
 876         switch (blank_mode) {
 877         case FB_BLANK_UNBLANK:
 878         case FB_BLANK_NORMAL:
 879                 atmel_lcdfb_start(sinfo);
 880                 break;
 881         case FB_BLANK_VSYNC_SUSPEND:
 882         case FB_BLANK_HSYNC_SUSPEND:
 883                 break;
 884         case FB_BLANK_POWERDOWN:
 885                 atmel_lcdfb_stop(sinfo);
 886                 break;
 887         default:
 888                 return -EINVAL;
 889         }
 890
 891         /* let fbcon do a soft blank for us */
 892         return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
 893 }
 894
 895 static struct fb_ops atmel_lcdfb_ops = {
 896         .owner          = THIS_MODULE,
 897         .fb_check_var   = atmel_lcdfb_check_var,
 898         .fb_set_par     = atmel_lcdfb_set_par,
 899         .fb_setcolreg   = atmel_lcdfb_setcolreg,
 900         .fb_blank       = atmel_lcdfb_blank,
 901         .fb_pan_display = atmel_lcdfb_pan_display,
 902         .fb_fillrect    = cfb_fillrect,
 903         .fb_copyarea    = cfb_copyarea,
 904         .fb_imageblit   = cfb_imageblit,
 905 };
 906
 907 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
 908 {
 909         struct fb_info *info = dev_id;
 910         struct atmel_lcdfb_info *sinfo = info->par;
 911         u32 status;
 912
 913         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
 914         if (status & ATMEL_LCDC_UFLWI) {
 915                 dev_warn(info->device, "FIFO underflow %#x\n", status);
 916                 /* reset DMA and FIFO to avoid screen shifting */
 917                 schedule_work(&sinfo->task);
 918         }
 919         lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
 920         return IRQ_HANDLED;
 921 }
 922
 923 /*
 924  * LCD controller task (to reset the LCD)
 925  */
 926 static void atmel_lcdfb_task(struct work_struct *work)
 927 {
 928         struct atmel_lcdfb_info *sinfo =
 929                 container_of(work, struct atmel_lcdfb_info, task);
 930
 931         atmel_lcdfb_reset(sinfo);
 932 }
 933
 934 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
 935 {
 936         struct fb_info *info = sinfo->info;
 937         int ret = 0;
 938
 939         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
 940
 941         dev_info(info->device,
 942                "%luKiB frame buffer at %08lx (mapped at %p)\n",
 943                (unsigned long)info->fix.smem_len / 1024,
 944                (unsigned long)info->fix.smem_start,
 945                info->screen_base);
 946
 947         /* Allocate colormap */
 948         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 949         if (ret < 0)
 950                 dev_err(info->device, "Alloc color map failed\n");
 951
 952         return ret;
 953 }
 954
 955 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
 956 {
 957         clk_prepare_enable(sinfo->bus_clk);
 958         clk_prepare_enable(sinfo->lcdc_clk);
 959 }
 960
 961 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
 962 {
 963         clk_disable_unprepare(sinfo->bus_clk);
 964         clk_disable_unprepare(sinfo->lcdc_clk);
 965 }
 966
 967 #ifdef CONFIG_OF
 968 static const struct of_device_id atmel_lcdfb_dt_ids[] = {
 969         { .compatible = "atmel,at91sam9261-lcdc" , .data = &at91sam9261_config, },
 970         { .compatible = "atmel,at91sam9263-lcdc" , .data = &at91sam9263_config, },
 971         { .compatible = "atmel,at91sam9g10-lcdc" , .data = &at91sam9g10_config, },
 972         { .compatible = "atmel,at91sam9g45-lcdc" , .data = &at91sam9g45_config, },
 973         { .compatible = "atmel,at91sam9g45es-lcdc" , .data = &at91sam9g45es_config, },
 974         { .compatible = "atmel,at91sam9rl-lcdc" , .data = &at91sam9rl_config, },
 975         { .compatible = "atmel,at32ap-lcdc" , .data = &at32ap_config, },
 976         { /* sentinel */ }
 977 };
 978
 979 MODULE_DEVICE_TABLE(of, atmel_lcdfb_dt_ids);
 980
 981 static const char *atmel_lcdfb_wiring_modes[] = {
 982         [ATMEL_LCDC_WIRING_BGR] = "BRG",
 983         [ATMEL_LCDC_WIRING_RGB] = "RGB",
 984 };
 985
 986 const int atmel_lcdfb_get_of_wiring_modes(struct device_node *np)
 987 {
 988         const char *mode;
 989         int err, i;
 990
 991         err = of_property_read_string(np, "atmel,lcd-wiring-mode", &mode);
 992         if (err < 0)
 993                 return ATMEL_LCDC_WIRING_BGR;
 994
 995         for (i = 0; i < ARRAY_SIZE(atmel_lcdfb_wiring_modes); i++)
 996                 if (!strcasecmp(mode, atmel_lcdfb_wiring_modes[i]))
 997                         return i;
 998
 999         return -ENODEV;
1000 }
1001
1002 static void atmel_lcdfb_power_control_gpio(struct atmel_lcdfb_pdata *pdata, int on)
1003 {
1004         struct atmel_lcdfb_power_ctrl_gpio *og;
1005
1006         list_for_each_entry(og, &pdata->pwr_gpios, list)
1007                 gpio_set_value(og->gpio, on);
1008 }
1009
1010 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
1011 {
1012         struct fb_info *info = sinfo->info;
1013         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
1014         struct fb_var_screeninfo *var = &info->var;
1015         struct device *dev = &sinfo->pdev->dev;
1016         struct device_node *np =dev->of_node;
1017         struct device_node *display_np;
1018         struct device_node *timings_np;
1019         struct display_timings *timings;
1020         enum of_gpio_flags flags;
1021         struct atmel_lcdfb_power_ctrl_gpio *og;
1022         bool is_gpio_power = false;
1023         int ret = -ENOENT;
1024         int i, gpio;
1025
1026         sinfo->config = (struct atmel_lcdfb_config*)
1027                 of_match_device(atmel_lcdfb_dt_ids, dev)->data;
1028
1029         display_np = of_parse_phandle(np, "display", 0);
1030         if (!display_np) {
1031                 dev_err(dev, "failed to find display phandle\n");
1032                 return -ENOENT;
1033         }
1034
1035         ret = of_property_read_u32(display_np, "bits-per-pixel", &var->bits_per_pixel);
1036         if (ret < 0) {
1037                 dev_err(dev, "failed to get property bits-per-pixel\n");
1038                 goto put_display_node;
1039         }
1040
1041         ret = of_property_read_u32(display_np, "atmel,guard-time", &pdata->guard_time);
1042         if (ret < 0) {
1043                 dev_err(dev, "failed to get property atmel,guard-time\n");
1044                 goto put_display_node;
1045         }
1046
1047         ret = of_property_read_u32(display_np, "atmel,lcdcon2", &pdata->default_lcdcon2);
1048         if (ret < 0) {
1049                 dev_err(dev, "failed to get property atmel,lcdcon2\n");
1050                 goto put_display_node;
1051         }
1052
1053         ret = of_property_read_u32(display_np, "atmel,dmacon", &pdata->default_dmacon);
1054         if (ret < 0) {
1055                 dev_err(dev, "failed to get property bits-per-pixel\n");
1056                 goto put_display_node;
1057         }
1058
1059         ret = -ENOMEM;
1060         for (i = 0; i < of_gpio_named_count(display_np, "atmel,power-control-gpio"); i++) {
1061                 gpio = of_get_named_gpio_flags(display_np, "atmel,power-control-gpio",
1062                                                i, &flags);
1063                 if (gpio < 0)
1064                         continue;
1065
1066                 og = devm_kzalloc(dev, sizeof(*og), GFP_KERNEL);
1067                 if (!og)
1068                         goto put_display_node;
1069
1070                 og->gpio = gpio;
1071                 og->active_low = flags & OF_GPIO_ACTIVE_LOW;
1072                 is_gpio_power = true;
1073                 ret = devm_gpio_request(dev, gpio, "lcd-power-control-gpio");
1074                 if (ret) {
1075                         dev_err(dev, "request gpio %d failed\n", gpio);
1076                         goto put_display_node;
1077                 }
1078
1079                 ret = gpio_direction_output(gpio, og->active_low);
1080                 if (ret) {
1081                         dev_err(dev, "set direction output gpio %d failed\n", gpio);
1082                         goto put_display_node;
1083                 }
1084         }
1085
1086         if (is_gpio_power)
1087                 pdata->atmel_lcdfb_power_control = atmel_lcdfb_power_control_gpio;
1088
1089         ret = atmel_lcdfb_get_of_wiring_modes(display_np);
1090         if (ret < 0) {
1091                 dev_err(dev, "invalid atmel,lcd-wiring-mode\n");
1092                 goto put_display_node;
1093         }
1094         pdata->lcd_wiring_mode = ret;
1095
1096         pdata->lcdcon_is_backlight = of_property_read_bool(display_np, "atmel,lcdcon-backlight");
1097
1098         timings = of_get_display_timings(display_np);
1099         if (!timings) {
1100                 dev_err(dev, "failed to get display timings\n");
1101                 goto put_display_node;
1102         }
1103
1104         timings_np = of_find_node_by_name(display_np, "display-timings");
1105         if (!timings_np) {
1106                 dev_err(dev, "failed to find display-timings node\n");
1107                 goto put_display_node;
1108         }
1109
1110         for (i = 0; i < of_get_child_count(timings_np); i++) {
1111                 struct videomode vm;
1112                 struct fb_videomode fb_vm;
1113
1114                 ret = videomode_from_timings(timings, &vm, i);
1115                 if (ret < 0)
1116                         goto put_timings_node;
1117                 ret = fb_videomode_from_videomode(&vm, &fb_vm);
1118                 if (ret < 0)
1119                         goto put_timings_node;
1120
1121                 fb_add_videomode(&fb_vm, &info->modelist);
1122         }
1123
1124         return 0;
1125
1126 put_timings_node:
1127         of_node_put(timings_np);
1128 put_display_node:
1129         of_node_put(display_np);
1130         return ret;
1131 }
1132 #else
1133 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
1134 {
1135         return 0;
1136 }
1137 #endif
1138
1139 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
1140 {
1141         struct device *dev = &pdev->dev;
1142         struct fb_info *info;
1143         struct atmel_lcdfb_info *sinfo;
1144         struct atmel_lcdfb_pdata *pdata = NULL;
1145         struct resource *regs = NULL;
1146         struct resource *map = NULL;
1147         struct fb_modelist *modelist;
1148         int ret;
1149
1150         dev_dbg(dev, "%s BEGIN\n", __func__);
1151
1152         ret = -ENOMEM;
1153         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
1154         if (!info) {
1155                 dev_err(dev, "cannot allocate memory\n");
1156                 goto out;
1157         }
1158
1159         sinfo = info->par;
1160         sinfo->pdev = pdev;
1161         sinfo->info = info;
1162
1163         INIT_LIST_HEAD(&info->modelist);
1164
1165         if (pdev->dev.of_node) {
1166                 ret = atmel_lcdfb_of_init(sinfo);
1167                 if (ret)
1168                         goto free_info;
1169         } else if (dev_get_platdata(dev)) {
1170                 struct fb_monspecs *monspecs;
1171                 int i;
1172
1173                 pdata = dev_get_platdata(dev);
1174                 monspecs = pdata->default_monspecs;
1175                 sinfo->pdata = *pdata;
1176
1177                 for (i = 0; i < monspecs->modedb_len; i++)
1178                         fb_add_videomode(&monspecs->modedb[i], &info->modelist);
1179
1180                 sinfo->config = atmel_lcdfb_get_config(pdev);
1181
1182                 info->var.bits_per_pixel = pdata->default_bpp ? pdata->default_bpp : 16;
1183                 memcpy(&info->monspecs, pdata->default_monspecs, sizeof(info->monspecs));
1184         } else {
1185                 dev_err(dev, "cannot get default configuration\n");
1186                 goto free_info;
1187         }
1188
1189         if (!sinfo->config)
1190                 goto free_info;
1191
1192         strcpy(info->fix.id, sinfo->pdev->name);
1193         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
1194         info->pseudo_palette = sinfo->pseudo_palette;
1195         info->fbops = &atmel_lcdfb_ops;
1196
1197         info->fix = atmel_lcdfb_fix;
1198
1199         /* Enable LCDC Clocks */
1200         sinfo->bus_clk = clk_get(dev, "hclk");
1201         if (IS_ERR(sinfo->bus_clk)) {
1202                 ret = PTR_ERR(sinfo->bus_clk);
1203                 goto free_info;
1204         }
1205         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
1206         if (IS_ERR(sinfo->lcdc_clk)) {
1207                 ret = PTR_ERR(sinfo->lcdc_clk);
1208                 goto put_bus_clk;
1209         }
1210         atmel_lcdfb_start_clock(sinfo);
1211
1212         modelist = list_first_entry(&info->modelist,
1213                         struct fb_modelist, list);
1214         fb_videomode_to_var(&info->var, &modelist->mode);
1215
1216         atmel_lcdfb_check_var(&info->var, info);
1217
1218         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1219         if (!regs) {
1220                 dev_err(dev, "resources unusable\n");
1221                 ret = -ENXIO;
1222                 goto stop_clk;
1223         }
1224
1225         sinfo->irq_base = platform_get_irq(pdev, 0);
1226         if (sinfo->irq_base < 0) {
1227                 dev_err(dev, "unable to get irq\n");
1228                 ret = sinfo->irq_base;
1229                 goto stop_clk;
1230         }
1231
1232         /* Initialize video memory */
1233         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1234         if (map) {
1235                 /* use a pre-allocated memory buffer */
1236                 info->fix.smem_start = map->start;
1237                 info->fix.smem_len = resource_size(map);
1238                 if (!request_mem_region(info->fix.smem_start,
1239                                         info->fix.smem_len, pdev->name)) {
1240                         ret = -EBUSY;
1241                         goto stop_clk;
1242                 }
1243
1244                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1245                 if (!info->screen_base) {
1246                         ret = -ENOMEM;
1247                         goto release_intmem;
1248                 }
1249
1250                 /*
1251                  * Don't clear the framebuffer -- someone may have set
1252                  * up a splash image.
1253                  */
1254         } else {
1255                 /* allocate memory buffer */
1256                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
1257                 if (ret < 0) {
1258                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
1259                         goto stop_clk;
1260                 }
1261         }
1262
1263         /* LCDC registers */
1264         info->fix.mmio_start = regs->start;
1265         info->fix.mmio_len = resource_size(regs);
1266
1267         if (!request_mem_region(info->fix.mmio_start,
1268                                 info->fix.mmio_len, pdev->name)) {
1269                 ret = -EBUSY;
1270                 goto free_fb;
1271         }
1272
1273         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
1274         if (!sinfo->mmio) {
1275                 dev_err(dev, "cannot map LCDC registers\n");
1276                 ret = -ENOMEM;
1277                 goto release_mem;
1278         }
1279
1280         /* Initialize PWM for contrast or backlight ("off") */
1281         init_contrast(sinfo);
1282
1283         /* interrupt */
1284         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
1285         if (ret) {
1286                 dev_err(dev, "request_irq failed: %d\n", ret);
1287                 goto unmap_mmio;
1288         }
1289
1290         /* Some operations on the LCDC might sleep and
1291          * require a preemptible task context */
1292         INIT_WORK(&sinfo->task, atmel_lcdfb_task);
1293
1294         ret = atmel_lcdfb_init_fbinfo(sinfo);
1295         if (ret < 0) {
1296                 dev_err(dev, "init fbinfo failed: %d\n", ret);
1297                 goto unregister_irqs;
1298         }
1299
1300         dev_set_drvdata(dev, info);
1301
1302         /*
1303          * Tell the world that we're ready to go
1304          */
1305         ret = register_framebuffer(info);
1306         if (ret < 0) {
1307                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
1308                 goto reset_drvdata;
1309         }
1310
1311         /* Power up the LCDC screen */
1312         atmel_lcdfb_power_control(sinfo, 1);
1313
1314         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1315                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
1316
1317         return 0;
1318
1319 reset_drvdata:
1320         dev_set_drvdata(dev, NULL);
1321         fb_dealloc_cmap(&info->cmap);
1322 unregister_irqs:
1323         cancel_work_sync(&sinfo->task);
1324         free_irq(sinfo->irq_base, info);
1325 unmap_mmio:
1326         exit_backlight(sinfo);
1327         iounmap(sinfo->mmio);
1328 release_mem:
1329         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1330 free_fb:
1331         if (map)
1332                 iounmap(info->screen_base);
1333         else
1334                 atmel_lcdfb_free_video_memory(sinfo);
1335
1336 release_intmem:
1337         if (map)
1338                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1339 stop_clk:
1340         atmel_lcdfb_stop_clock(sinfo);
1341         clk_put(sinfo->lcdc_clk);
1342 put_bus_clk:
1343         clk_put(sinfo->bus_clk);
1344 free_info:
1345         framebuffer_release(info);
1346 out:
1347         dev_dbg(dev, "%s FAILED\n", __func__);
1348         return ret;
1349 }
1350
1351 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1352 {
1353         struct device *dev = &pdev->dev;
1354         struct fb_info *info = dev_get_drvdata(dev);
1355         struct atmel_lcdfb_info *sinfo;
1356         struct atmel_lcdfb_pdata *pdata;
1357
1358         if (!info || !info->par)
1359                 return 0;
1360         sinfo = info->par;
1361         pdata = &sinfo->pdata;
1362
1363         cancel_work_sync(&sinfo->task);
1364         exit_backlight(sinfo);
1365         atmel_lcdfb_power_control(sinfo, 0);
1366         unregister_framebuffer(info);
1367         atmel_lcdfb_stop_clock(sinfo);
1368         clk_put(sinfo->lcdc_clk);
1369         clk_put(sinfo->bus_clk);
1370         fb_dealloc_cmap(&info->cmap);
1371         free_irq(sinfo->irq_base, info);
1372         iounmap(sinfo->mmio);
1373         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1374         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1375                 iounmap(info->screen_base);
1376                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1377         } else {
1378                 atmel_lcdfb_free_video_memory(sinfo);
1379         }
1380
1381         framebuffer_release(info);
1382
1383         return 0;
1384 }
1385
1386 #ifdef CONFIG_PM
1387
1388 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1389 {
1390         struct fb_info *info = platform_get_drvdata(pdev);
1391         struct atmel_lcdfb_info *sinfo = info->par;
1392
1393         /*
1394          * We don't want to handle interrupts while the clock is
1395          * stopped. It may take forever.
1396          */
1397         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1398
1399         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_CTR);
1400         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1401         atmel_lcdfb_power_control(sinfo, 0);
1402         atmel_lcdfb_stop(sinfo);
1403         atmel_lcdfb_stop_clock(sinfo);
1404
1405         return 0;
1406 }
1407
1408 static int atmel_lcdfb_resume(struct platform_device *pdev)
1409 {
1410         struct fb_info *info = platform_get_drvdata(pdev);
1411         struct atmel_lcdfb_info *sinfo = info->par;
1412
1413         atmel_lcdfb_start_clock(sinfo);
1414         atmel_lcdfb_start(sinfo);
1415         atmel_lcdfb_power_control(sinfo, 1);
1416         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1417
1418         /* Enable FIFO & DMA errors */
1419         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1420                         | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1421
1422         return 0;
1423 }
1424
1425 #else
1426 #define atmel_lcdfb_suspend     NULL
1427 #define atmel_lcdfb_resume      NULL
1428 #endif
1429
1430 static struct platform_driver atmel_lcdfb_driver = {
1431         .remove         = __exit_p(atmel_lcdfb_remove),
1432         .suspend        = atmel_lcdfb_suspend,
1433         .resume         = atmel_lcdfb_resume,
1434         .id_table       = atmel_lcdfb_devtypes,
1435         .driver         = {
1436                 .name   = "atmel_lcdfb",
1437                 .owner  = THIS_MODULE,
1438                 .of_match_table = of_match_ptr(atmel_lcdfb_dt_ids),
1439         },
1440 };
1441
1442 module_platform_driver_probe(atmel_lcdfb_driver, atmel_lcdfb_probe);
1443
1444 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1445 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1446 MODULE_LICENSE("GPL");