drivers/video/fbdev/atmel_lcdfb.c

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