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