kernel/drivers/video/fbdev/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 <linux/regulator/consumer.h>
  28 #include <video/videomode.h>
  29
  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         struct regulator        *reg_lcd;
  64 };
  65
  66 struct atmel_lcdfb_power_ctrl_gpio {
  67         int gpio;
  68         int active_low;
  69
  70         struct list_head list;
  71 };
  72
  73 #define lcdc_readl(sinfo, reg)          __raw_readl((sinfo)->mmio+(reg))
  74 #define lcdc_writel(sinfo, reg, val)    __raw_writel((val), (sinfo)->mmio+(reg))
  75
  76 /* configurable parameters */
  77 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
  78 #define ATMEL_LCDC_DMA_BURST_LEN        8       /* words */
  79 #define ATMEL_LCDC_FIFO_SIZE            512     /* words */
  80
  81 static struct atmel_lcdfb_config at91sam9261_config = {
  82         .have_hozval            = true,
  83         .have_intensity_bit     = true,
  84 };
  85
  86 static struct atmel_lcdfb_config at91sam9263_config = {
  87         .have_intensity_bit     = true,
  88 };
  89
  90 static struct atmel_lcdfb_config at91sam9g10_config = {
  91         .have_hozval            = true,
  92 };
  93
  94 static struct atmel_lcdfb_config at91sam9g45_config = {
  95         .have_alt_pixclock      = true,
  96 };
  97
  98 static struct atmel_lcdfb_config at91sam9g45es_config = {
  99 };
 100
 101 static struct atmel_lcdfb_config at91sam9rl_config = {
 102         .have_intensity_bit     = true,
 103 };
 104
 105 static struct atmel_lcdfb_config at32ap_config = {
 106         .have_hozval            = true,
 107 };
 108
 109 static const struct platform_device_id atmel_lcdfb_devtypes[] = {
 110         {
 111                 .name = "at91sam9261-lcdfb",
 112                 .driver_data = (unsigned long)&at91sam9261_config,
 113         }, {
 114                 .name = "at91sam9263-lcdfb",
 115                 .driver_data = (unsigned long)&at91sam9263_config,
 116         }, {
 117                 .name = "at91sam9g10-lcdfb",
 118                 .driver_data = (unsigned long)&at91sam9g10_config,
 119         }, {
 120                 .name = "at91sam9g45-lcdfb",
 121                 .driver_data = (unsigned long)&at91sam9g45_config,
 122         }, {
 123                 .name = "at91sam9g45es-lcdfb",
 124                 .driver_data = (unsigned long)&at91sam9g45es_config,
 125         }, {
 126                 .name = "at91sam9rl-lcdfb",
 127                 .driver_data = (unsigned long)&at91sam9rl_config,
 128         }, {
 129                 .name = "at32ap-lcdfb",
 130                 .driver_data = (unsigned long)&at32ap_config,
 131         }, {
 132                 /* terminator */
 133         }
 134 };
 135 MODULE_DEVICE_TABLE(platform, atmel_lcdfb_devtypes);
 136
 137 static struct atmel_lcdfb_config *
 138 atmel_lcdfb_get_config(struct platform_device *pdev)
 139 {
 140         unsigned long data;
 141
 142         data = platform_get_device_id(pdev)->driver_data;
 143
 144         return (struct atmel_lcdfb_config *)data;
 145 }
 146
 147 #if defined(CONFIG_ARCH_AT91)
 148 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
 149                                          | FBINFO_PARTIAL_PAN_OK \
 150                                          | FBINFO_HWACCEL_YPAN)
 151
 152 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
 153                                         struct fb_var_screeninfo *var,
 154                                         struct fb_info *info)
 155 {
 156
 157 }
 158 #elif defined(CONFIG_AVR32)
 159 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
 160                                         | FBINFO_PARTIAL_PAN_OK \
 161                                         | FBINFO_HWACCEL_XPAN \
 162                                         | FBINFO_HWACCEL_YPAN)
 163
 164 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
 165                                      struct fb_var_screeninfo *var,
 166                                      struct fb_info *info)
 167 {
 168         u32 dma2dcfg;
 169         u32 pixeloff;
 170
 171         pixeloff = (var->xoffset * info->var.bits_per_pixel) & 0x1f;
 172
 173         dma2dcfg = (info->var.xres_virtual - info->var.xres)
 174                  * info->var.bits_per_pixel / 8;
 175         dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
 176         lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
 177
 178         /* Update configuration */
 179         lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
 180                     lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
 181                     | ATMEL_LCDC_DMAUPDT);
 182 }
 183 #endif
 184
 185 static u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
 186                 | ATMEL_LCDC_POL_POSITIVE
 187                 | ATMEL_LCDC_ENA_PWMENABLE;
 188
 189 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
 190
 191 /* some bl->props field just changed */
 192 static int atmel_bl_update_status(struct backlight_device *bl)
 193 {
 194         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 195         int                     power = sinfo->bl_power;
 196         int                     brightness = bl->props.brightness;
 197
 198         /* REVISIT there may be a meaningful difference between
 199          * fb_blank and power ... there seem to be some cases
 200          * this doesn't handle correctly.
 201          */
 202         if (bl->props.fb_blank != sinfo->bl_power)
 203                 power = bl->props.fb_blank;
 204         else if (bl->props.power != sinfo->bl_power)
 205                 power = bl->props.power;
 206
 207         if (brightness < 0 && power == FB_BLANK_UNBLANK)
 208                 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 209         else if (power != FB_BLANK_UNBLANK)
 210                 brightness = 0;
 211
 212         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
 213         if (contrast_ctr & ATMEL_LCDC_POL_POSITIVE)
 214                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
 215                         brightness ? contrast_ctr : 0);
 216         else
 217                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 218
 219         bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
 220
 221         return 0;
 222 }
 223
 224 static int atmel_bl_get_brightness(struct backlight_device *bl)
 225 {
 226         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 227
 228         return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 229 }
 230
 231 static const struct backlight_ops atmel_lcdc_bl_ops = {
 232         .update_status = atmel_bl_update_status,
 233         .get_brightness = atmel_bl_get_brightness,
 234 };
 235
 236 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 237 {
 238         struct backlight_properties props;
 239         struct backlight_device *bl;
 240
 241         sinfo->bl_power = FB_BLANK_UNBLANK;
 242
 243         if (sinfo->backlight)
 244                 return;
 245
 246         memset(&props, 0, sizeof(struct backlight_properties));
 247         props.type = BACKLIGHT_RAW;
 248         props.max_brightness = 0xff;
 249         bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo,
 250                                        &atmel_lcdc_bl_ops, &props);
 251         if (IS_ERR(bl)) {
 252                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
 253                                 PTR_ERR(bl));
 254                 return;
 255         }
 256         sinfo->backlight = bl;
 257
 258         bl->props.power = FB_BLANK_UNBLANK;
 259         bl->props.fb_blank = FB_BLANK_UNBLANK;
 260         bl->props.brightness = atmel_bl_get_brightness(bl);
 261 }
 262
 263 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 264 {
 265         if (!sinfo->backlight)
 266                 return;
 267
 268         if (sinfo->backlight->ops) {
 269                 sinfo->backlight->props.power = FB_BLANK_POWERDOWN;
 270                 sinfo->backlight->ops->update_status(sinfo->backlight);
 271         }
 272         backlight_device_unregister(sinfo->backlight);
 273 }
 274
 275 #else
 276
 277 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 278 {
 279         dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
 280 }
 281
 282 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 283 {
 284 }
 285
 286 #endif
 287
 288 static void init_contrast(struct atmel_lcdfb_info *sinfo)
 289 {
 290         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 291
 292         /* contrast pwm can be 'inverted' */
 293         if (pdata->lcdcon_pol_negative)
 294                 contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
 295
 296         /* have some default contrast/backlight settings */
 297         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 298         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 299
 300         if (pdata->lcdcon_is_backlight)
 301                 init_backlight(sinfo);
 302 }
 303
 304 static inline void atmel_lcdfb_power_control(struct atmel_lcdfb_info *sinfo, int on)
 305 {
 306         int ret;
 307         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 308
 309         if (pdata->atmel_lcdfb_power_control)
 310                 pdata->atmel_lcdfb_power_control(pdata, on);
 311         else if (sinfo->reg_lcd) {
 312                 if (on) {
 313                         ret = regulator_enable(sinfo->reg_lcd);
 314                         if (ret)
 315                                 dev_err(&sinfo->pdev->dev,
 316                                         "lcd regulator enable failed:   %d\n", ret);
 317                 } else {
 318                         ret = regulator_disable(sinfo->reg_lcd);
 319                         if (ret)
 320                                 dev_err(&sinfo->pdev->dev,
 321                                         "lcd regulator disable failed: %d\n", ret);
 322                 }
 323         }
 324 }
 325
 326 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
 327         .type           = FB_TYPE_PACKED_PIXELS,
 328         .visual         = FB_VISUAL_TRUECOLOR,
 329         .xpanstep       = 0,
 330         .ypanstep       = 1,
 331         .ywrapstep      = 0,
 332         .accel          = FB_ACCEL_NONE,
 333 };
 334
 335 static unsigned long compute_hozval(struct atmel_lcdfb_info *sinfo,
 336                                                         unsigned long xres)
 337 {
 338         unsigned long lcdcon2;
 339         unsigned long value;
 340
 341         if (!sinfo->config->have_hozval)
 342                 return xres;
 343
 344         lcdcon2 = lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2);
 345         value = xres;
 346         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
 347                 /* STN display */
 348                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
 349                         value *= 3;
 350                 }
 351                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
 352                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
 353                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
 354                         value = DIV_ROUND_UP(value, 4);
 355                 else
 356                         value = DIV_ROUND_UP(value, 8);
 357         }
 358
 359         return value;
 360 }
 361
 362 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
 363 {
 364         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 365
 366         /* Turn off the LCD controller and the DMA controller */
 367         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 368                         pdata->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
 369
 370         /* Wait for the LCDC core to become idle */
 371         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 372                 msleep(10);
 373
 374         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
 375 }
 376
 377 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
 378 {
 379         atmel_lcdfb_stop_nowait(sinfo);
 380
 381         /* Wait for DMA engine to become idle... */
 382         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 383                 msleep(10);
 384 }
 385
 386 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
 387 {
 388         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 389
 390         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, pdata->default_dmacon);
 391         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 392                 (pdata->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
 393                 | ATMEL_LCDC_PWR);
 394 }
 395
 396 static void atmel_lcdfb_update_dma(struct fb_info *info,
 397                                struct fb_var_screeninfo *var)
 398 {
 399         struct atmel_lcdfb_info *sinfo = info->par;
 400         struct fb_fix_screeninfo *fix = &info->fix;
 401         unsigned long dma_addr;
 402
 403         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
 404                     + var->xoffset * info->var.bits_per_pixel / 8);
 405
 406         dma_addr &= ~3UL;
 407
 408         /* Set framebuffer DMA base address and pixel offset */
 409         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
 410
 411         atmel_lcdfb_update_dma2d(sinfo, var, info);
 412 }
 413
 414 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
 415 {
 416         struct fb_info *info = sinfo->info;
 417
 418         dma_free_writecombine(info->device, info->fix.smem_len,
 419                                 info->screen_base, info->fix.smem_start);
 420 }
 421
 422 /**
 423  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
 424  *      @sinfo: the frame buffer to allocate memory for
 425  *
 426  *      This function is called only from the atmel_lcdfb_probe()
 427  *      so no locking by fb_info->mm_lock around smem_len setting is needed.
 428  */
 429 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
 430 {
 431         struct fb_info *info = sinfo->info;
 432         struct fb_var_screeninfo *var = &info->var;
 433         unsigned int smem_len;
 434
 435         smem_len = (var->xres_virtual * var->yres_virtual
 436                     * ((var->bits_per_pixel + 7) / 8));
 437         info->fix.smem_len = max(smem_len, sinfo->smem_len);
 438
 439         info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
 440                                         (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
 441
 442         if (!info->screen_base) {
 443                 return -ENOMEM;
 444         }
 445
 446         memset(info->screen_base, 0, info->fix.smem_len);
 447
 448         return 0;
 449 }
 450
 451 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
 452                                                      struct fb_info *info)
 453 {
 454         struct fb_videomode varfbmode;
 455         const struct fb_videomode *fbmode = NULL;
 456
 457         fb_var_to_videomode(&varfbmode, var);
 458         fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
 459         if (fbmode)
 460                 fb_videomode_to_var(var, fbmode);
 461         return fbmode;
 462 }
 463
 464
 465 /**
 466  *      atmel_lcdfb_check_var - Validates a var passed in.
 467  *      @var: frame buffer variable screen structure
 468  *      @info: frame buffer structure that represents a single frame buffer
 469  *
 470  *      Checks to see if the hardware supports the state requested by
 471  *      var passed in. This function does not alter the hardware
 472  *      state!!!  This means the data stored in struct fb_info and
 473  *      struct atmel_lcdfb_info do not change. This includes the var
 474  *      inside of struct fb_info.  Do NOT change these. This function
 475  *      can be called on its own if we intent to only test a mode and
 476  *      not actually set it. The stuff in modedb.c is a example of
 477  *      this. If the var passed in is slightly off by what the
 478  *      hardware can support then we alter the var PASSED in to what
 479  *      we can do. If the hardware doesn't support mode change a
 480  *      -EINVAL will be returned by the upper layers. You don't need
 481  *      to implement this function then. If you hardware doesn't
 482  *      support changing the resolution then this function is not
 483  *      needed. In this case the driver would just provide a var that
 484  *      represents the static state the screen is in.
 485  *
 486  *      Returns negative errno on error, or zero on success.
 487  */
 488 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
 489                              struct fb_info *info)
 490 {
 491         struct device *dev = info->device;
 492         struct atmel_lcdfb_info *sinfo = info->par;
 493         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 494         unsigned long clk_value_khz;
 495
 496         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 497
 498         dev_dbg(dev, "%s:\n", __func__);
 499
 500         if (!(var->pixclock && var->bits_per_pixel)) {
 501                 /* choose a suitable mode if possible */
 502                 if (!atmel_lcdfb_choose_mode(var, info)) {
 503                         dev_err(dev, "needed value not specified\n");
 504                         return -EINVAL;
 505                 }
 506         }
 507
 508         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
 509         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
 510         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
 511         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
 512
 513         if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
 514                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
 515                 return -EINVAL;
 516         }
 517
 518         /* Do not allow to have real resoulution larger than virtual */
 519         if (var->xres > var->xres_virtual)
 520                 var->xres_virtual = var->xres;
 521
 522         if (var->yres > var->yres_virtual)
 523                 var->yres_virtual = var->yres;
 524
 525         /* Force same alignment for each line */
 526         var->xres = (var->xres + 3) & ~3UL;
 527         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
 528
 529         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
 530         var->transp.msb_right = 0;
 531         var->transp.offset = var->transp.length = 0;
 532         var->xoffset = var->yoffset = 0;
 533
 534         if (info->fix.smem_len) {
 535                 unsigned int smem_len = (var->xres_virtual * var->yres_virtual
 536                                          * ((var->bits_per_pixel + 7) / 8));
 537                 if (smem_len > info->fix.smem_len) {
 538                         dev_err(dev, "Frame buffer is too small (%u) for screen size (need at least %u)\n",
 539                                 info->fix.smem_len, smem_len);
 540                         return -EINVAL;
 541                 }
 542         }
 543
 544         /* Saturate vertical and horizontal timings at maximum values */
 545         var->vsync_len = min_t(u32, var->vsync_len,
 546                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
 547         var->upper_margin = min_t(u32, var->upper_margin,
 548                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
 549         var->lower_margin = min_t(u32, var->lower_margin,
 550                         ATMEL_LCDC_VFP);
 551         var->right_margin = min_t(u32, var->right_margin,
 552                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
 553         var->hsync_len = min_t(u32, var->hsync_len,
 554                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
 555         var->left_margin = min_t(u32, var->left_margin,
 556                         ATMEL_LCDC_HBP + 1);
 557
 558         /* Some parameters can't be zero */
 559         var->vsync_len = max_t(u32, var->vsync_len, 1);
 560         var->right_margin = max_t(u32, var->right_margin, 1);
 561         var->hsync_len = max_t(u32, var->hsync_len, 1);
 562         var->left_margin = max_t(u32, var->left_margin, 1);
 563
 564         switch (var->bits_per_pixel) {
 565         case 1:
 566         case 2:
 567         case 4:
 568         case 8:
 569                 var->red.offset = var->green.offset = var->blue.offset = 0;
 570                 var->red.length = var->green.length = var->blue.length
 571                         = var->bits_per_pixel;
 572                 break;
 573         case 16:
 574                 /* Older SOCs use IBGR:555 rather than BGR:565. */
 575                 if (sinfo->config->have_intensity_bit)
 576                         var->green.length = 5;
 577                 else
 578                         var->green.length = 6;
 579
 580                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 581                         /* RGB:5X5 mode */
 582                         var->red.offset = var->green.length + 5;
 583                         var->blue.offset = 0;
 584                 } else {
 585                         /* BGR:5X5 mode */
 586                         var->red.offset = 0;
 587                         var->blue.offset = var->green.length + 5;
 588                 }
 589                 var->green.offset = 5;
 590                 var->red.length = var->blue.length = 5;
 591                 break;
 592         case 32:
 593                 var->transp.offset = 24;
 594                 var->transp.length = 8;
 595                 /* fall through */
 596         case 24:
 597                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 598                         /* RGB:888 mode */
 599                         var->red.offset = 16;
 600                         var->blue.offset = 0;
 601                 } else {
 602                         /* BGR:888 mode */
 603                         var->red.offset = 0;
 604                         var->blue.offset = 16;
 605                 }
 606                 var->green.offset = 8;
 607                 var->red.length = var->green.length = var->blue.length = 8;
 608                 break;
 609         default:
 610                 dev_err(dev, "color depth %d not supported\n",
 611                                         var->bits_per_pixel);
 612                 return -EINVAL;
 613         }
 614
 615         return 0;
 616 }
 617
 618 /*
 619  * LCD reset sequence
 620  */
 621 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
 622 {
 623         might_sleep();
 624
 625         atmel_lcdfb_stop(sinfo);
 626         atmel_lcdfb_start(sinfo);
 627 }
 628
 629 /**
 630  *      atmel_lcdfb_set_par - Alters the hardware state.
 631  *      @info: frame buffer structure that represents a single frame buffer
 632  *
 633  *      Using the fb_var_screeninfo in fb_info we set the resolution
 634  *      of the this particular framebuffer. This function alters the
 635  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
 636  *      not alter var in fb_info since we are using that data. This
 637  *      means we depend on the data in var inside fb_info to be
 638  *      supported by the hardware.  atmel_lcdfb_check_var is always called
 639  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
 640  *      change the resolution you don't need this function.
 641  *
 642  */
 643 static int atmel_lcdfb_set_par(struct fb_info *info)
 644 {
 645         struct atmel_lcdfb_info *sinfo = info->par;
 646         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 647         unsigned long hozval_linesz;
 648         unsigned long value;
 649         unsigned long clk_value_khz;
 650         unsigned long bits_per_line;
 651         unsigned long pix_factor = 2;
 652
 653         might_sleep();
 654
 655         dev_dbg(info->device, "%s:\n", __func__);
 656         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
 657                  info->var.xres, info->var.yres,
 658                  info->var.xres_virtual, info->var.yres_virtual);
 659
 660         atmel_lcdfb_stop_nowait(sinfo);
 661
 662         if (info->var.bits_per_pixel == 1)
 663                 info->fix.visual = FB_VISUAL_MONO01;
 664         else if (info->var.bits_per_pixel <= 8)
 665                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 666         else
 667                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 668
 669         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
 670         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
 671
 672         /* Re-initialize the DMA engine... */
 673         dev_dbg(info->device, "  * update DMA engine\n");
 674         atmel_lcdfb_update_dma(info, &info->var);
 675
 676         /* ...set frame size and burst length = 8 words (?) */
 677         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
 678         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 679         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
 680
 681         /* Now, the LCDC core... */
 682
 683         /* Set pixel clock */
 684         if (sinfo->config->have_alt_pixclock)
 685                 pix_factor = 1;
 686
 687         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 688
 689         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
 690
 691         if (value < pix_factor) {
 692                 dev_notice(info->device, "Bypassing pixel clock divider\n");
 693                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 694         } else {
 695                 value = (value / pix_factor) - 1;
 696                 dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
 697                                 value);
 698                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
 699                                 value << ATMEL_LCDC_CLKVAL_OFFSET);
 700                 info->var.pixclock =
 701                         KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1)));
 702                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
 703                                         PICOS2KHZ(info->var.pixclock));
 704         }
 705
 706
 707         /* Initialize control register 2 */
 708         value = pdata->default_lcdcon2;
 709
 710         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
 711                 value |= ATMEL_LCDC_INVLINE_INVERTED;
 712         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
 713                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
 714
 715         switch (info->var.bits_per_pixel) {
 716                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
 717                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
 718                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
 719                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
 720                 case 15: /* fall through */
 721                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
 722                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
 723                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
 724                 default: BUG(); break;
 725         }
 726         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
 727         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
 728
 729         /* Vertical timing */
 730         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 731         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
 732         value |= info->var.lower_margin;
 733         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
 734         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
 735
 736         /* Horizontal timing */
 737         value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 738         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 739         value |= (info->var.left_margin - 1);
 740         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
 741         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
 742
 743         /* Horizontal value (aka line size) */
 744         hozval_linesz = compute_hozval(sinfo, info->var.xres);
 745
 746         /* Display size */
 747         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 748         value |= info->var.yres - 1;
 749         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
 750         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
 751
 752         /* FIFO Threshold: Use formula from data sheet */
 753         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 754         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
 755
 756         /* Toggle LCD_MODE every frame */
 757         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
 758
 759         /* Disable all interrupts */
 760         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
 761         /* Enable FIFO & DMA errors */
 762         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
 763
 764         /* ...wait for DMA engine to become idle... */
 765         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 766                 msleep(10);
 767
 768         atmel_lcdfb_start(sinfo);
 769
 770         dev_dbg(info->device, "  * DONE\n");
 771
 772         return 0;
 773 }
 774
 775 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
 776 {
 777         chan &= 0xffff;
 778         chan >>= 16 - bf->length;
 779         return chan << bf->offset;
 780 }
 781
 782 /**
 783  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
 784  *      @regno: Which register in the CLUT we are programming
 785  *      @red: The red value which can be up to 16 bits wide
 786  *      @green: The green value which can be up to 16 bits wide
 787  *      @blue:  The blue value which can be up to 16 bits wide.
 788  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 789  *      @info: frame buffer info structure
 790  *
 791  *      Set a single color register. The values supplied have a 16 bit
 792  *      magnitude which needs to be scaled in this function for the hardware.
 793  *      Things to take into consideration are how many color registers, if
 794  *      any, are supported with the current color visual. With truecolor mode
 795  *      no color palettes are supported. Here a pseudo palette is created
 796  *      which we store the value in pseudo_palette in struct fb_info. For
 797  *      pseudocolor mode we have a limited color palette. To deal with this
 798  *      we can program what color is displayed for a particular pixel value.
 799  *      DirectColor is similar in that we can program each color field. If
 800  *      we have a static colormap we don't need to implement this function.
 801  *
 802  *      Returns negative errno on error, or zero on success. In an
 803  *      ideal world, this would have been the case, but as it turns
 804  *      out, the other drivers return 1 on failure, so that's what
 805  *      we're going to do.
 806  */
 807 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
 808                              unsigned int green, unsigned int blue,
 809                              unsigned int transp, struct fb_info *info)
 810 {
 811         struct atmel_lcdfb_info *sinfo = info->par;
 812         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 813         unsigned int val;
 814         u32 *pal;
 815         int ret = 1;
 816
 817         if (info->var.grayscale)
 818                 red = green = blue = (19595 * red + 38470 * green
 819                                       + 7471 * blue) >> 16;
 820
 821         switch (info->fix.visual) {
 822         case FB_VISUAL_TRUECOLOR:
 823                 if (regno < 16) {
 824                         pal = info->pseudo_palette;
 825
 826                         val  = chan_to_field(red, &info->var.red);
 827                         val |= chan_to_field(green, &info->var.green);
 828                         val |= chan_to_field(blue, &info->var.blue);
 829
 830                         pal[regno] = val;
 831                         ret = 0;
 832                 }
 833                 break;
 834
 835         case FB_VISUAL_PSEUDOCOLOR:
 836                 if (regno < 256) {
 837                         if (sinfo->config->have_intensity_bit) {
 838                                 /* old style I+BGR:555 */
 839                                 val  = ((red   >> 11) & 0x001f);
 840                                 val |= ((green >>  6) & 0x03e0);
 841                                 val |= ((blue  >>  1) & 0x7c00);
 842
 843                                 /*
 844                                  * TODO: intensity bit. Maybe something like
 845                                  *   ~(red[10] ^ green[10] ^ blue[10]) & 1
 846                                  */
 847                         } else {
 848                                 /* new style BGR:565 / RGB:565 */
 849                                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 850                                         val  = ((blue >> 11) & 0x001f);
 851                                         val |= ((red  >>  0) & 0xf800);
 852                                 } else {
 853                                         val  = ((red  >> 11) & 0x001f);
 854                                         val |= ((blue >>  0) & 0xf800);
 855                                 }
 856
 857                                 val |= ((green >>  5) & 0x07e0);
 858                         }
 859
 860                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 861                         ret = 0;
 862                 }
 863                 break;
 864
 865         case FB_VISUAL_MONO01:
 866                 if (regno < 2) {
 867                         val = (regno == 0) ? 0x00 : 0x1F;
 868                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 869                         ret = 0;
 870                 }
 871                 break;
 872
 873         }
 874
 875         return ret;
 876 }
 877
 878 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
 879                                struct fb_info *info)
 880 {
 881         dev_dbg(info->device, "%s\n", __func__);
 882
 883         atmel_lcdfb_update_dma(info, var);
 884
 885         return 0;
 886 }
 887
 888 static int atmel_lcdfb_blank(int blank_mode, struct fb_info *info)
 889 {
 890         struct atmel_lcdfb_info *sinfo = info->par;
 891
 892         switch (blank_mode) {
 893         case FB_BLANK_UNBLANK:
 894         case FB_BLANK_NORMAL:
 895                 atmel_lcdfb_start(sinfo);
 896                 break;
 897         case FB_BLANK_VSYNC_SUSPEND:
 898         case FB_BLANK_HSYNC_SUSPEND:
 899                 break;
 900         case FB_BLANK_POWERDOWN:
 901                 atmel_lcdfb_stop(sinfo);
 902                 break;
 903         default:
 904                 return -EINVAL;
 905         }
 906
 907         /* let fbcon do a soft blank for us */
 908         return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
 909 }
 910
 911 static struct fb_ops atmel_lcdfb_ops = {
 912         .owner          = THIS_MODULE,
 913         .fb_check_var   = atmel_lcdfb_check_var,
 914         .fb_set_par     = atmel_lcdfb_set_par,
 915         .fb_setcolreg   = atmel_lcdfb_setcolreg,
 916         .fb_blank       = atmel_lcdfb_blank,
 917         .fb_pan_display = atmel_lcdfb_pan_display,
 918         .fb_fillrect    = cfb_fillrect,
 919         .fb_copyarea    = cfb_copyarea,
 920         .fb_imageblit   = cfb_imageblit,
 921 };
 922
 923 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
 924 {
 925         struct fb_info *info = dev_id;
 926         struct atmel_lcdfb_info *sinfo = info->par;
 927         u32 status;
 928
 929         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
 930         if (status & ATMEL_LCDC_UFLWI) {
 931                 dev_warn(info->device, "FIFO underflow %#x\n", status);
 932                 /* reset DMA and FIFO to avoid screen shifting */
 933                 schedule_work(&sinfo->task);
 934         }
 935         lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
 936         return IRQ_HANDLED;
 937 }
 938
 939 /*
 940  * LCD controller task (to reset the LCD)
 941  */
 942 static void atmel_lcdfb_task(struct work_struct *work)
 943 {
 944         struct atmel_lcdfb_info *sinfo =
 945                 container_of(work, struct atmel_lcdfb_info, task);
 946
 947         atmel_lcdfb_reset(sinfo);
 948 }
 949
 950 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
 951 {
 952         struct fb_info *info = sinfo->info;
 953         int ret = 0;
 954
 955         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
 956
 957         dev_info(info->device,
 958                "%luKiB frame buffer at %08lx (mapped at %p)\n",
 959                (unsigned long)info->fix.smem_len / 1024,
 960                (unsigned long)info->fix.smem_start,
 961                info->screen_base);
 962
 963         /* Allocate colormap */
 964         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 965         if (ret < 0)
 966                 dev_err(info->device, "Alloc color map failed\n");
 967
 968         return ret;
 969 }
 970
 971 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
 972 {
 973         clk_prepare_enable(sinfo->bus_clk);
 974         clk_prepare_enable(sinfo->lcdc_clk);
 975 }
 976
 977 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
 978 {
 979         clk_disable_unprepare(sinfo->bus_clk);
 980         clk_disable_unprepare(sinfo->lcdc_clk);
 981 }
 982
 983 #ifdef CONFIG_OF
 984 static const struct of_device_id atmel_lcdfb_dt_ids[] = {
 985         { .compatible = "atmel,at91sam9261-lcdc" , .data = &at91sam9261_config, },
 986         { .compatible = "atmel,at91sam9263-lcdc" , .data = &at91sam9263_config, },
 987         { .compatible = "atmel,at91sam9g10-lcdc" , .data = &at91sam9g10_config, },
 988         { .compatible = "atmel,at91sam9g45-lcdc" , .data = &at91sam9g45_config, },
 989         { .compatible = "atmel,at91sam9g45es-lcdc" , .data = &at91sam9g45es_config, },
 990         { .compatible = "atmel,at91sam9rl-lcdc" , .data = &at91sam9rl_config, },
 991         { .compatible = "atmel,at32ap-lcdc" , .data = &at32ap_config, },
 992         { /* sentinel */ }
 993 };
 994
 995 MODULE_DEVICE_TABLE(of, atmel_lcdfb_dt_ids);
 996
 997 static const char *atmel_lcdfb_wiring_modes[] = {
 998         [ATMEL_LCDC_WIRING_BGR] = "BRG",
 999         [ATMEL_LCDC_WIRING_RGB] = "RGB",
1000 };
1001
1002 const int atmel_lcdfb_get_of_wiring_modes(struct device_node *np)
1003 {
1004         const char *mode;
1005         int err, i;
1006
1007         err = of_property_read_string(np, "atmel,lcd-wiring-mode", &mode);
1008         if (err < 0)
1009                 return ATMEL_LCDC_WIRING_BGR;
1010
1011         for (i = 0; i < ARRAY_SIZE(atmel_lcdfb_wiring_modes); i++)
1012                 if (!strcasecmp(mode, atmel_lcdfb_wiring_modes[i]))
1013                         return i;
1014
1015         return -ENODEV;
1016 }
1017
1018 static void atmel_lcdfb_power_control_gpio(struct atmel_lcdfb_pdata *pdata, int on)
1019 {
1020         struct atmel_lcdfb_power_ctrl_gpio *og;
1021
1022         list_for_each_entry(og, &pdata->pwr_gpios, list)
1023                 gpio_set_value(og->gpio, on);
1024 }
1025
1026 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
1027 {
1028         struct fb_info *info = sinfo->info;
1029         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
1030         struct fb_var_screeninfo *var = &info->var;
1031         struct device *dev = &sinfo->pdev->dev;
1032         struct device_node *np =dev->of_node;
1033         struct device_node *display_np;
1034         struct device_node *timings_np;
1035         struct display_timings *timings;
1036         enum of_gpio_flags flags;
1037         struct atmel_lcdfb_power_ctrl_gpio *og;
1038         bool is_gpio_power = false;
1039         int ret = -ENOENT;
1040         int i, gpio;
1041
1042         sinfo->config = (struct atmel_lcdfb_config*)
1043                 of_match_device(atmel_lcdfb_dt_ids, dev)->data;
1044
1045         display_np = of_parse_phandle(np, "display", 0);
1046         if (!display_np) {
1047                 dev_err(dev, "failed to find display phandle\n");
1048                 return -ENOENT;
1049         }
1050
1051         ret = of_property_read_u32(display_np, "bits-per-pixel", &var->bits_per_pixel);
1052         if (ret < 0) {
1053                 dev_err(dev, "failed to get property bits-per-pixel\n");
1054                 goto put_display_node;
1055         }
1056
1057         ret = of_property_read_u32(display_np, "atmel,guard-time", &pdata->guard_time);
1058         if (ret < 0) {
1059                 dev_err(dev, "failed to get property atmel,guard-time\n");
1060                 goto put_display_node;
1061         }
1062
1063         ret = of_property_read_u32(display_np, "atmel,lcdcon2", &pdata->default_lcdcon2);
1064         if (ret < 0) {
1065                 dev_err(dev, "failed to get property atmel,lcdcon2\n");
1066                 goto put_display_node;
1067         }
1068
1069         ret = of_property_read_u32(display_np, "atmel,dmacon", &pdata->default_dmacon);
1070         if (ret < 0) {
1071                 dev_err(dev, "failed to get property bits-per-pixel\n");
1072                 goto put_display_node;
1073         }
1074
1075         INIT_LIST_HEAD(&pdata->pwr_gpios);
1076         ret = -ENOMEM;
1077         for (i = 0; i < of_gpio_named_count(display_np, "atmel,power-control-gpio"); i++) {
1078                 gpio = of_get_named_gpio_flags(display_np, "atmel,power-control-gpio",
1079                                                i, &flags);
1080                 if (gpio < 0)
1081                         continue;
1082
1083                 og = devm_kzalloc(dev, sizeof(*og), GFP_KERNEL);
1084                 if (!og)
1085                         goto put_display_node;
1086
1087                 og->gpio = gpio;
1088                 og->active_low = flags & OF_GPIO_ACTIVE_LOW;
1089                 is_gpio_power = true;
1090                 ret = devm_gpio_request(dev, gpio, "lcd-power-control-gpio");
1091                 if (ret) {
1092                         dev_err(dev, "request gpio %d failed\n", gpio);
1093                         goto put_display_node;
1094                 }
1095
1096                 ret = gpio_direction_output(gpio, og->active_low);
1097                 if (ret) {
1098                         dev_err(dev, "set direction output gpio %d failed\n", gpio);
1099                         goto put_display_node;
1100                 }
1101                 list_add(&og->list, &pdata->pwr_gpios);
1102         }
1103
1104         if (is_gpio_power)
1105                 pdata->atmel_lcdfb_power_control = atmel_lcdfb_power_control_gpio;
1106
1107         ret = atmel_lcdfb_get_of_wiring_modes(display_np);
1108         if (ret < 0) {
1109                 dev_err(dev, "invalid atmel,lcd-wiring-mode\n");
1110                 goto put_display_node;
1111         }
1112         pdata->lcd_wiring_mode = ret;
1113
1114         pdata->lcdcon_is_backlight = of_property_read_bool(display_np, "atmel,lcdcon-backlight");
1115         pdata->lcdcon_pol_negative = of_property_read_bool(display_np, "atmel,lcdcon-backlight-inverted");
1116
1117         timings = of_get_display_timings(display_np);
1118         if (!timings) {
1119                 dev_err(dev, "failed to get display timings\n");
1120                 ret = -EINVAL;
1121                 goto put_display_node;
1122         }
1123
1124         timings_np = of_find_node_by_name(display_np, "display-timings");
1125         if (!timings_np) {
1126                 dev_err(dev, "failed to find display-timings node\n");
1127                 ret = -ENODEV;
1128                 goto put_display_node;
1129         }
1130
1131         for (i = 0; i < of_get_child_count(timings_np); i++) {
1132                 struct videomode vm;
1133                 struct fb_videomode fb_vm;
1134
1135                 ret = videomode_from_timings(timings, &vm, i);
1136                 if (ret < 0)
1137                         goto put_timings_node;
1138                 ret = fb_videomode_from_videomode(&vm, &fb_vm);
1139                 if (ret < 0)
1140                         goto put_timings_node;
1141
1142                 fb_add_videomode(&fb_vm, &info->modelist);
1143         }
1144
1145         return 0;
1146
1147 put_timings_node:
1148         of_node_put(timings_np);
1149 put_display_node:
1150         of_node_put(display_np);
1151         return ret;
1152 }
1153 #else
1154 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
1155 {
1156         return 0;
1157 }
1158 #endif
1159
1160 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
1161 {
1162         struct device *dev = &pdev->dev;
1163         struct fb_info *info;
1164         struct atmel_lcdfb_info *sinfo;
1165         struct atmel_lcdfb_pdata *pdata = NULL;
1166         struct resource *regs = NULL;
1167         struct resource *map = NULL;
1168         struct fb_modelist *modelist;
1169         int ret;
1170
1171         dev_dbg(dev, "%s BEGIN\n", __func__);
1172
1173         ret = -ENOMEM;
1174         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
1175         if (!info) {
1176                 dev_err(dev, "cannot allocate memory\n");
1177                 goto out;
1178         }
1179
1180         sinfo = info->par;
1181         sinfo->pdev = pdev;
1182         sinfo->info = info;
1183
1184         INIT_LIST_HEAD(&info->modelist);
1185
1186         if (pdev->dev.of_node) {
1187                 ret = atmel_lcdfb_of_init(sinfo);
1188                 if (ret)
1189                         goto free_info;
1190         } else if (dev_get_platdata(dev)) {
1191                 struct fb_monspecs *monspecs;
1192                 int i;
1193
1194                 pdata = dev_get_platdata(dev);
1195                 monspecs = pdata->default_monspecs;
1196                 sinfo->pdata = *pdata;
1197
1198                 for (i = 0; i < monspecs->modedb_len; i++)
1199                         fb_add_videomode(&monspecs->modedb[i], &info->modelist);
1200
1201                 sinfo->config = atmel_lcdfb_get_config(pdev);
1202
1203                 info->var.bits_per_pixel = pdata->default_bpp ? pdata->default_bpp : 16;
1204                 memcpy(&info->monspecs, pdata->default_monspecs, sizeof(info->monspecs));
1205         } else {
1206                 dev_err(dev, "cannot get default configuration\n");
1207                 goto free_info;
1208         }
1209
1210         if (!sinfo->config)
1211                 goto free_info;
1212
1213         sinfo->reg_lcd = devm_regulator_get(&pdev->dev, "lcd");
1214         if (IS_ERR(sinfo->reg_lcd))
1215                 sinfo->reg_lcd = NULL;
1216
1217         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
1218         info->pseudo_palette = sinfo->pseudo_palette;
1219         info->fbops = &atmel_lcdfb_ops;
1220
1221         info->fix = atmel_lcdfb_fix;
1222         strcpy(info->fix.id, sinfo->pdev->name);
1223
1224         /* Enable LCDC Clocks */
1225         sinfo->bus_clk = clk_get(dev, "hclk");
1226         if (IS_ERR(sinfo->bus_clk)) {
1227                 ret = PTR_ERR(sinfo->bus_clk);
1228                 goto free_info;
1229         }
1230         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
1231         if (IS_ERR(sinfo->lcdc_clk)) {
1232                 ret = PTR_ERR(sinfo->lcdc_clk);
1233                 goto put_bus_clk;
1234         }
1235         atmel_lcdfb_start_clock(sinfo);
1236
1237         modelist = list_first_entry(&info->modelist,
1238                         struct fb_modelist, list);
1239         fb_videomode_to_var(&info->var, &modelist->mode);
1240
1241         atmel_lcdfb_check_var(&info->var, info);
1242
1243         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1244         if (!regs) {
1245                 dev_err(dev, "resources unusable\n");
1246                 ret = -ENXIO;
1247                 goto stop_clk;
1248         }
1249
1250         sinfo->irq_base = platform_get_irq(pdev, 0);
1251         if (sinfo->irq_base < 0) {
1252                 dev_err(dev, "unable to get irq\n");
1253                 ret = sinfo->irq_base;
1254                 goto stop_clk;
1255         }
1256
1257         /* Initialize video memory */
1258         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1259         if (map) {
1260                 /* use a pre-allocated memory buffer */
1261                 info->fix.smem_start = map->start;
1262                 info->fix.smem_len = resource_size(map);
1263                 if (!request_mem_region(info->fix.smem_start,
1264                                         info->fix.smem_len, pdev->name)) {
1265                         ret = -EBUSY;
1266                         goto stop_clk;
1267                 }
1268
1269                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1270                 if (!info->screen_base) {
1271                         ret = -ENOMEM;
1272                         goto release_intmem;
1273                 }
1274
1275                 /*
1276                  * Don't clear the framebuffer -- someone may have set
1277                  * up a splash image.
1278                  */
1279         } else {
1280                 /* allocate memory buffer */
1281                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
1282                 if (ret < 0) {
1283                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
1284                         goto stop_clk;
1285                 }
1286         }
1287
1288         /* LCDC registers */
1289         info->fix.mmio_start = regs->start;
1290         info->fix.mmio_len = resource_size(regs);
1291
1292         if (!request_mem_region(info->fix.mmio_start,
1293                                 info->fix.mmio_len, pdev->name)) {
1294                 ret = -EBUSY;
1295                 goto free_fb;
1296         }
1297
1298         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
1299         if (!sinfo->mmio) {
1300                 dev_err(dev, "cannot map LCDC registers\n");
1301                 ret = -ENOMEM;
1302                 goto release_mem;
1303         }
1304
1305         /* Initialize PWM for contrast or backlight ("off") */
1306         init_contrast(sinfo);
1307
1308         /* interrupt */
1309         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
1310         if (ret) {
1311                 dev_err(dev, "request_irq failed: %d\n", ret);
1312                 goto unmap_mmio;
1313         }
1314
1315         /* Some operations on the LCDC might sleep and
1316          * require a preemptible task context */
1317         INIT_WORK(&sinfo->task, atmel_lcdfb_task);
1318
1319         ret = atmel_lcdfb_init_fbinfo(sinfo);
1320         if (ret < 0) {
1321                 dev_err(dev, "init fbinfo failed: %d\n", ret);
1322                 goto unregister_irqs;
1323         }
1324
1325         ret = atmel_lcdfb_set_par(info);
1326         if (ret < 0) {
1327                 dev_err(dev, "set par failed: %d\n", ret);
1328                 goto unregister_irqs;
1329         }
1330
1331         dev_set_drvdata(dev, info);
1332
1333         /*
1334          * Tell the world that we're ready to go
1335          */
1336         ret = register_framebuffer(info);
1337         if (ret < 0) {
1338                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
1339                 goto reset_drvdata;
1340         }
1341
1342         /* Power up the LCDC screen */
1343         atmel_lcdfb_power_control(sinfo, 1);
1344
1345         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1346                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
1347
1348         return 0;
1349
1350 reset_drvdata:
1351         dev_set_drvdata(dev, NULL);
1352         fb_dealloc_cmap(&info->cmap);
1353 unregister_irqs:
1354         cancel_work_sync(&sinfo->task);
1355         free_irq(sinfo->irq_base, info);
1356 unmap_mmio:
1357         exit_backlight(sinfo);
1358         iounmap(sinfo->mmio);
1359 release_mem:
1360         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1361 free_fb:
1362         if (map)
1363                 iounmap(info->screen_base);
1364         else
1365                 atmel_lcdfb_free_video_memory(sinfo);
1366
1367 release_intmem:
1368         if (map)
1369                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1370 stop_clk:
1371         atmel_lcdfb_stop_clock(sinfo);
1372         clk_put(sinfo->lcdc_clk);
1373 put_bus_clk:
1374         clk_put(sinfo->bus_clk);
1375 free_info:
1376         framebuffer_release(info);
1377 out:
1378         dev_dbg(dev, "%s FAILED\n", __func__);
1379         return ret;
1380 }
1381
1382 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1383 {
1384         struct device *dev = &pdev->dev;
1385         struct fb_info *info = dev_get_drvdata(dev);
1386         struct atmel_lcdfb_info *sinfo;
1387         struct atmel_lcdfb_pdata *pdata;
1388
1389         if (!info || !info->par)
1390                 return 0;
1391         sinfo = info->par;
1392         pdata = &sinfo->pdata;
1393
1394         cancel_work_sync(&sinfo->task);
1395         exit_backlight(sinfo);
1396         atmel_lcdfb_power_control(sinfo, 0);
1397         unregister_framebuffer(info);
1398         atmel_lcdfb_stop_clock(sinfo);
1399         clk_put(sinfo->lcdc_clk);
1400         clk_put(sinfo->bus_clk);
1401         fb_dealloc_cmap(&info->cmap);
1402         free_irq(sinfo->irq_base, info);
1403         iounmap(sinfo->mmio);
1404         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1405         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1406                 iounmap(info->screen_base);
1407                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1408         } else {
1409                 atmel_lcdfb_free_video_memory(sinfo);
1410         }
1411
1412         framebuffer_release(info);
1413
1414         return 0;
1415 }
1416
1417 #ifdef CONFIG_PM
1418
1419 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1420 {
1421         struct fb_info *info = platform_get_drvdata(pdev);
1422         struct atmel_lcdfb_info *sinfo = info->par;
1423
1424         /*
1425          * We don't want to handle interrupts while the clock is
1426          * stopped. It may take forever.
1427          */
1428         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1429
1430         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_CTR);
1431         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1432         atmel_lcdfb_power_control(sinfo, 0);
1433         atmel_lcdfb_stop(sinfo);
1434         atmel_lcdfb_stop_clock(sinfo);
1435
1436         return 0;
1437 }
1438
1439 static int atmel_lcdfb_resume(struct platform_device *pdev)
1440 {
1441         struct fb_info *info = platform_get_drvdata(pdev);
1442         struct atmel_lcdfb_info *sinfo = info->par;
1443
1444         atmel_lcdfb_start_clock(sinfo);
1445         atmel_lcdfb_start(sinfo);
1446         atmel_lcdfb_power_control(sinfo, 1);
1447         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1448
1449         /* Enable FIFO & DMA errors */
1450         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1451                         | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1452
1453         return 0;
1454 }
1455
1456 #else
1457 #define atmel_lcdfb_suspend     NULL
1458 #define atmel_lcdfb_resume      NULL
1459 #endif
1460
1461 static struct platform_driver atmel_lcdfb_driver = {
1462         .remove         = __exit_p(atmel_lcdfb_remove),
1463         .suspend        = atmel_lcdfb_suspend,
1464         .resume         = atmel_lcdfb_resume,
1465         .id_table       = atmel_lcdfb_devtypes,
1466         .driver         = {
1467                 .name   = "atmel_lcdfb",
1468                 .of_match_table = of_match_ptr(atmel_lcdfb_dt_ids),
1469         },
1470 };
1471
1472 module_platform_driver_probe(atmel_lcdfb_driver, atmel_lcdfb_probe);
1473
1474 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1475 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1476 MODULE_LICENSE("GPL");