drivers/video/fbdev/atmel_lcdfb.c

   1 /*
   2  *  Driver for AT91/AT32 LCD Controller
   3  *
   4  *  Copyright (C) 2007 Atmel Corporation
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file COPYING in the main directory of this archive for
   8  * more details.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/dma-mapping.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/clk.h>
  16 #include <linux/fb.h>
  17 #include <linux/init.h>
  18 #include <linux/delay.h>
  19 #include <linux/backlight.h>
  20 #include <linux/gfp.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/of_device.h>
  24 #include <linux/of_gpio.h>
  25 #include <video/of_display_timing.h>
  26 #include <linux/regulator/consumer.h>
  27 #include <video/videomode.h>
  28
  29 #include <video/atmel_lcdc.h>
  30
  31 struct atmel_lcdfb_config {
  32         bool have_alt_pixclock;
  33         bool have_hozval;
  34         bool have_intensity_bit;
  35 };
  36
  37  /* LCD Controller info data structure, stored in device platform_data */
  38 struct atmel_lcdfb_info {
  39         spinlock_t              lock;
  40         struct fb_info          *info;
  41         void __iomem            *mmio;
  42         int                     irq_base;
  43         struct work_struct      task;
  44
  45         unsigned int            smem_len;
  46         struct platform_device  *pdev;
  47         struct clk              *bus_clk;
  48         struct clk              *lcdc_clk;
  49
  50         struct backlight_device *backlight;
  51         u8                      bl_power;
  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         int gpio;
  65         int active_low;
  66
  67         struct list_head list;
  68 };
  69
  70 #define lcdc_readl(sinfo, reg)          __raw_readl((sinfo)->mmio+(reg))
  71 #define lcdc_writel(sinfo, reg, val)    __raw_writel((val), (sinfo)->mmio+(reg))
  72
  73 /* configurable parameters */
  74 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
  75 #define ATMEL_LCDC_DMA_BURST_LEN        8       /* words */
  76 #define ATMEL_LCDC_FIFO_SIZE            512     /* words */
  77
  78 static struct atmel_lcdfb_config at91sam9261_config = {
  79         .have_hozval            = true,
  80         .have_intensity_bit     = true,
  81 };
  82
  83 static struct atmel_lcdfb_config at91sam9263_config = {
  84         .have_intensity_bit     = true,
  85 };
  86
  87 static struct atmel_lcdfb_config at91sam9g10_config = {
  88         .have_hozval            = true,
  89 };
  90
  91 static struct atmel_lcdfb_config at91sam9g45_config = {
  92         .have_alt_pixclock      = true,
  93 };
  94
  95 static struct atmel_lcdfb_config at91sam9g45es_config = {
  96 };
  97
  98 static struct atmel_lcdfb_config at91sam9rl_config = {
  99         .have_intensity_bit     = true,
 100 };
 101
 102 static struct atmel_lcdfb_config at32ap_config = {
 103         .have_hozval            = true,
 104 };
 105
 106 static const struct platform_device_id atmel_lcdfb_devtypes[] = {
 107         {
 108                 .name = "at91sam9261-lcdfb",
 109                 .driver_data = (unsigned long)&at91sam9261_config,
 110         }, {
 111                 .name = "at91sam9263-lcdfb",
 112                 .driver_data = (unsigned long)&at91sam9263_config,
 113         }, {
 114                 .name = "at91sam9g10-lcdfb",
 115                 .driver_data = (unsigned long)&at91sam9g10_config,
 116         }, {
 117                 .name = "at91sam9g45-lcdfb",
 118                 .driver_data = (unsigned long)&at91sam9g45_config,
 119         }, {
 120                 .name = "at91sam9g45es-lcdfb",
 121                 .driver_data = (unsigned long)&at91sam9g45es_config,
 122         }, {
 123                 .name = "at91sam9rl-lcdfb",
 124                 .driver_data = (unsigned long)&at91sam9rl_config,
 125         }, {
 126                 .name = "at32ap-lcdfb",
 127                 .driver_data = (unsigned long)&at32ap_config,
 128         }, {
 129                 /* terminator */
 130         }
 131 };
 132 MODULE_DEVICE_TABLE(platform, atmel_lcdfb_devtypes);
 133
 134 static struct atmel_lcdfb_config *
 135 atmel_lcdfb_get_config(struct platform_device *pdev)
 136 {
 137         unsigned long data;
 138
 139         data = platform_get_device_id(pdev)->driver_data;
 140
 141         return (struct atmel_lcdfb_config *)data;
 142 }
 143
 144 #if defined(CONFIG_ARCH_AT91)
 145 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
 146                                          | FBINFO_PARTIAL_PAN_OK \
 147                                          | FBINFO_HWACCEL_YPAN)
 148
 149 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
 150                                         struct fb_var_screeninfo *var,
 151                                         struct fb_info *info)
 152 {
 153
 154 }
 155 #elif defined(CONFIG_AVR32)
 156 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
 157                                         | FBINFO_PARTIAL_PAN_OK \
 158                                         | FBINFO_HWACCEL_XPAN \
 159                                         | FBINFO_HWACCEL_YPAN)
 160
 161 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
 162                                      struct fb_var_screeninfo *var,
 163                                      struct fb_info *info)
 164 {
 165         u32 dma2dcfg;
 166         u32 pixeloff;
 167
 168         pixeloff = (var->xoffset * info->var.bits_per_pixel) & 0x1f;
 169
 170         dma2dcfg = (info->var.xres_virtual - info->var.xres)
 171                  * info->var.bits_per_pixel / 8;
 172         dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
 173         lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
 174
 175         /* Update configuration */
 176         lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
 177                     lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
 178                     | ATMEL_LCDC_DMAUPDT);
 179 }
 180 #endif
 181
 182 static u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
 183                 | ATMEL_LCDC_POL_POSITIVE
 184                 | ATMEL_LCDC_ENA_PWMENABLE;
 185
 186 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
 187
 188 /* some bl->props field just changed */
 189 static int atmel_bl_update_status(struct backlight_device *bl)
 190 {
 191         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 192         int                     power = sinfo->bl_power;
 193         int                     brightness = bl->props.brightness;
 194
 195         /* REVISIT there may be a meaningful difference between
 196          * fb_blank and power ... there seem to be some cases
 197          * this doesn't handle correctly.
 198          */
 199         if (bl->props.fb_blank != sinfo->bl_power)
 200                 power = bl->props.fb_blank;
 201         else if (bl->props.power != sinfo->bl_power)
 202                 power = bl->props.power;
 203
 204         if (brightness < 0 && power == FB_BLANK_UNBLANK)
 205                 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 206         else if (power != FB_BLANK_UNBLANK)
 207                 brightness = 0;
 208
 209         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
 210         if (contrast_ctr & ATMEL_LCDC_POL_POSITIVE)
 211                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
 212                         brightness ? contrast_ctr : 0);
 213         else
 214                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 215
 216         bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
 217
 218         return 0;
 219 }
 220
 221 static int atmel_bl_get_brightness(struct backlight_device *bl)
 222 {
 223         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 224
 225         return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 226 }
 227
 228 static const struct backlight_ops atmel_lcdc_bl_ops = {
 229         .update_status = atmel_bl_update_status,
 230         .get_brightness = atmel_bl_get_brightness,
 231 };
 232
 233 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 234 {
 235         struct backlight_properties props;
 236         struct backlight_device *bl;
 237
 238         sinfo->bl_power = FB_BLANK_UNBLANK;
 239
 240         if (sinfo->backlight)
 241                 return;
 242
 243         memset(&props, 0, sizeof(struct backlight_properties));
 244         props.type = BACKLIGHT_RAW;
 245         props.max_brightness = 0xff;
 246         bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo,
 247                                        &atmel_lcdc_bl_ops, &props);
 248         if (IS_ERR(bl)) {
 249                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
 250                                 PTR_ERR(bl));
 251                 return;
 252         }
 253         sinfo->backlight = bl;
 254
 255         bl->props.power = FB_BLANK_UNBLANK;
 256         bl->props.fb_blank = FB_BLANK_UNBLANK;
 257         bl->props.brightness = atmel_bl_get_brightness(bl);
 258 }
 259
 260 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 261 {
 262         if (!sinfo->backlight)
 263                 return;
 264
 265         if (sinfo->backlight->ops) {
 266                 sinfo->backlight->props.power = FB_BLANK_POWERDOWN;
 267                 sinfo->backlight->ops->update_status(sinfo->backlight);
 268         }
 269         backlight_device_unregister(sinfo->backlight);
 270 }
 271
 272 #else
 273
 274 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 275 {
 276         dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
 277 }
 278
 279 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 280 {
 281 }
 282
 283 #endif
 284
 285 static void init_contrast(struct atmel_lcdfb_info *sinfo)
 286 {
 287         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 288
 289         /* contrast pwm can be 'inverted' */
 290         if (pdata->lcdcon_pol_negative)
 291                 contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
 292
 293         /* have some default contrast/backlight settings */
 294         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 295         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 296
 297         if (pdata->lcdcon_is_backlight)
 298                 init_backlight(sinfo);
 299 }
 300
 301 static inline void atmel_lcdfb_power_control(struct atmel_lcdfb_info *sinfo, int on)
 302 {
 303         int ret;
 304         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 305
 306         if (pdata->atmel_lcdfb_power_control)
 307                 pdata->atmel_lcdfb_power_control(pdata, on);
 308         else if (sinfo->reg_lcd) {
 309                 if (on) {
 310                         ret = regulator_enable(sinfo->reg_lcd);
 311                         if (ret)
 312                                 dev_err(&sinfo->pdev->dev,
 313                                         "lcd regulator enable failed:   %d\n", ret);
 314                 } else {
 315                         ret = regulator_disable(sinfo->reg_lcd);
 316                         if (ret)
 317                                 dev_err(&sinfo->pdev->dev,
 318                                         "lcd regulator disable failed: %d\n", ret);
 319                 }
 320         }
 321 }
 322
 323 static const struct fb_fix_screeninfo atmel_lcdfb_fix __initconst = {
 324         .type           = FB_TYPE_PACKED_PIXELS,
 325         .visual         = FB_VISUAL_TRUECOLOR,
 326         .xpanstep       = 0,
 327         .ypanstep       = 1,
 328         .ywrapstep      = 0,
 329         .accel          = FB_ACCEL_NONE,
 330 };
 331
 332 static unsigned long compute_hozval(struct atmel_lcdfb_info *sinfo,
 333                                                         unsigned long xres)
 334 {
 335         unsigned long lcdcon2;
 336         unsigned long value;
 337
 338         if (!sinfo->config->have_hozval)
 339                 return xres;
 340
 341         lcdcon2 = lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2);
 342         value = xres;
 343         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
 344                 /* STN display */
 345                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
 346                         value *= 3;
 347                 }
 348                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
 349                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
 350                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
 351                         value = DIV_ROUND_UP(value, 4);
 352                 else
 353                         value = DIV_ROUND_UP(value, 8);
 354         }
 355
 356         return value;
 357 }
 358
 359 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
 360 {
 361         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 362
 363         /* Turn off the LCD controller and the DMA controller */
 364         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 365                         pdata->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
 366
 367         /* Wait for the LCDC core to become idle */
 368         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 369                 msleep(10);
 370
 371         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
 372 }
 373
 374 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
 375 {
 376         atmel_lcdfb_stop_nowait(sinfo);
 377
 378         /* Wait for DMA engine to become idle... */
 379         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 380                 msleep(10);
 381 }
 382
 383 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
 384 {
 385         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 386
 387         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, pdata->default_dmacon);
 388         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 389                 (pdata->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
 390                 | ATMEL_LCDC_PWR);
 391 }
 392
 393 static void atmel_lcdfb_update_dma(struct fb_info *info,
 394                                struct fb_var_screeninfo *var)
 395 {
 396         struct atmel_lcdfb_info *sinfo = info->par;
 397         struct fb_fix_screeninfo *fix = &info->fix;
 398         unsigned long dma_addr;
 399
 400         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
 401                     + var->xoffset * info->var.bits_per_pixel / 8);
 402
 403         dma_addr &= ~3UL;
 404
 405         /* Set framebuffer DMA base address and pixel offset */
 406         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
 407
 408         atmel_lcdfb_update_dma2d(sinfo, var, info);
 409 }
 410
 411 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
 412 {
 413         struct fb_info *info = sinfo->info;
 414
 415         dma_free_wc(info->device, info->fix.smem_len, info->screen_base,
 416                     info->fix.smem_start);
 417 }
 418
 419 /**
 420  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
 421  *      @sinfo: the frame buffer to allocate memory for
 422  *
 423  *      This function is called only from the atmel_lcdfb_probe()
 424  *      so no locking by fb_info->mm_lock around smem_len setting is needed.
 425  */
 426 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
 427 {
 428         struct fb_info *info = sinfo->info;
 429         struct fb_var_screeninfo *var = &info->var;
 430         unsigned int smem_len;
 431
 432         smem_len = (var->xres_virtual * var->yres_virtual
 433                     * ((var->bits_per_pixel + 7) / 8));
 434         info->fix.smem_len = max(smem_len, sinfo->smem_len);
 435
 436         info->screen_base = dma_alloc_wc(info->device, info->fix.smem_len,
 437                                          (dma_addr_t *)&info->fix.smem_start,
 438                                          GFP_KERNEL);
 439
 440         if (!info->screen_base) {
 441                 return -ENOMEM;
 442         }
 443
 444         memset(info->screen_base, 0, info->fix.smem_len);
 445
 446         return 0;
 447 }
 448
 449 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
 450                                                      struct fb_info *info)
 451 {
 452         struct fb_videomode varfbmode;
 453         const struct fb_videomode *fbmode = NULL;
 454
 455         fb_var_to_videomode(&varfbmode, var);
 456         fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
 457         if (fbmode)
 458                 fb_videomode_to_var(var, fbmode);
 459         return fbmode;
 460 }
 461
 462
 463 /**
 464  *      atmel_lcdfb_check_var - Validates a var passed in.
 465  *      @var: frame buffer variable screen structure
 466  *      @info: frame buffer structure that represents a single frame buffer
 467  *
 468  *      Checks to see if the hardware supports the state requested by
 469  *      var passed in. This function does not alter the hardware
 470  *      state!!!  This means the data stored in struct fb_info and
 471  *      struct atmel_lcdfb_info do not change. This includes the var
 472  *      inside of struct fb_info.  Do NOT change these. This function
 473  *      can be called on its own if we intent to only test a mode and
 474  *      not actually set it. The stuff in modedb.c is a example of
 475  *      this. If the var passed in is slightly off by what the
 476  *      hardware can support then we alter the var PASSED in to what
 477  *      we can do. If the hardware doesn't support mode change a
 478  *      -EINVAL will be returned by the upper layers. You don't need
 479  *      to implement this function then. If you hardware doesn't
 480  *      support changing the resolution then this function is not
 481  *      needed. In this case the driver would just provide a var that
 482  *      represents the static state the screen is in.
 483  *
 484  *      Returns negative errno on error, or zero on success.
 485  */
 486 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
 487                              struct fb_info *info)
 488 {
 489         struct device *dev = info->device;
 490         struct atmel_lcdfb_info *sinfo = info->par;
 491         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 492         unsigned long clk_value_khz;
 493
 494         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 495
 496         dev_dbg(dev, "%s:\n", __func__);
 497
 498         if (!(var->pixclock && var->bits_per_pixel)) {
 499                 /* choose a suitable mode if possible */
 500                 if (!atmel_lcdfb_choose_mode(var, info)) {
 501                         dev_err(dev, "needed value not specified\n");
 502                         return -EINVAL;
 503                 }
 504         }
 505
 506         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
 507         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
 508         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
 509         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
 510
 511         if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
 512                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
 513                 return -EINVAL;
 514         }
 515
 516         /* Do not allow to have real resoulution larger than virtual */
 517         if (var->xres > var->xres_virtual)
 518                 var->xres_virtual = var->xres;
 519
 520         if (var->yres > var->yres_virtual)
 521                 var->yres_virtual = var->yres;
 522
 523         /* Force same alignment for each line */
 524         var->xres = (var->xres + 3) & ~3UL;
 525         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
 526
 527         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
 528         var->transp.msb_right = 0;
 529         var->transp.offset = var->transp.length = 0;
 530         var->xoffset = var->yoffset = 0;
 531
 532         if (info->fix.smem_len) {
 533                 unsigned int smem_len = (var->xres_virtual * var->yres_virtual
 534                                          * ((var->bits_per_pixel + 7) / 8));
 535                 if (smem_len > info->fix.smem_len) {
 536                         dev_err(dev, "Frame buffer is too small (%u) for screen size (need at least %u)\n",
 537                                 info->fix.smem_len, smem_len);
 538                         return -EINVAL;
 539                 }
 540         }
 541
 542         /* Saturate vertical and horizontal timings at maximum values */
 543         var->vsync_len = min_t(u32, var->vsync_len,
 544                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
 545         var->upper_margin = min_t(u32, var->upper_margin,
 546                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
 547         var->lower_margin = min_t(u32, var->lower_margin,
 548                         ATMEL_LCDC_VFP);
 549         var->right_margin = min_t(u32, var->right_margin,
 550                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
 551         var->hsync_len = min_t(u32, var->hsync_len,
 552                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
 553         var->left_margin = min_t(u32, var->left_margin,
 554                         ATMEL_LCDC_HBP + 1);
 555
 556         /* Some parameters can't be zero */
 557         var->vsync_len = max_t(u32, var->vsync_len, 1);
 558         var->right_margin = max_t(u32, var->right_margin, 1);
 559         var->hsync_len = max_t(u32, var->hsync_len, 1);
 560         var->left_margin = max_t(u32, var->left_margin, 1);
 561
 562         switch (var->bits_per_pixel) {
 563         case 1:
 564         case 2:
 565         case 4:
 566         case 8:
 567                 var->red.offset = var->green.offset = var->blue.offset = 0;
 568                 var->red.length = var->green.length = var->blue.length
 569                         = var->bits_per_pixel;
 570                 break;
 571         case 16:
 572                 /* Older SOCs use IBGR:555 rather than BGR:565. */
 573                 if (sinfo->config->have_intensity_bit)
 574                         var->green.length = 5;
 575                 else
 576                         var->green.length = 6;
 577
 578                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 579                         /* RGB:5X5 mode */
 580                         var->red.offset = var->green.length + 5;
 581                         var->blue.offset = 0;
 582                 } else {
 583                         /* BGR:5X5 mode */
 584                         var->red.offset = 0;
 585                         var->blue.offset = var->green.length + 5;
 586                 }
 587                 var->green.offset = 5;
 588                 var->red.length = var->blue.length = 5;
 589                 break;
 590         case 32:
 591                 var->transp.offset = 24;
 592                 var->transp.length = 8;
 593                 /* fall through */
 594         case 24:
 595                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 596                         /* RGB:888 mode */
 597                         var->red.offset = 16;
 598                         var->blue.offset = 0;
 599                 } else {
 600                         /* BGR:888 mode */
 601                         var->red.offset = 0;
 602                         var->blue.offset = 16;
 603                 }
 604                 var->green.offset = 8;
 605                 var->red.length = var->green.length = var->blue.length = 8;
 606                 break;
 607         default:
 608                 dev_err(dev, "color depth %d not supported\n",
 609                                         var->bits_per_pixel);
 610                 return -EINVAL;
 611         }
 612
 613         return 0;
 614 }
 615
 616 /*
 617  * LCD reset sequence
 618  */
 619 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
 620 {
 621         might_sleep();
 622
 623         atmel_lcdfb_stop(sinfo);
 624         atmel_lcdfb_start(sinfo);
 625 }
 626
 627 /**
 628  *      atmel_lcdfb_set_par - Alters the hardware state.
 629  *      @info: frame buffer structure that represents a single frame buffer
 630  *
 631  *      Using the fb_var_screeninfo in fb_info we set the resolution
 632  *      of the this particular framebuffer. This function alters the
 633  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
 634  *      not alter var in fb_info since we are using that data. This
 635  *      means we depend on the data in var inside fb_info to be
 636  *      supported by the hardware.  atmel_lcdfb_check_var is always called
 637  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
 638  *      change the resolution you don't need this function.
 639  *
 640  */
 641 static int atmel_lcdfb_set_par(struct fb_info *info)
 642 {
 643         struct atmel_lcdfb_info *sinfo = info->par;
 644         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 645         unsigned long hozval_linesz;
 646         unsigned long value;
 647         unsigned long clk_value_khz;
 648         unsigned long bits_per_line;
 649         unsigned long pix_factor = 2;
 650
 651         might_sleep();
 652
 653         dev_dbg(info->device, "%s:\n", __func__);
 654         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
 655                  info->var.xres, info->var.yres,
 656                  info->var.xres_virtual, info->var.yres_virtual);
 657
 658         atmel_lcdfb_stop_nowait(sinfo);
 659
 660         if (info->var.bits_per_pixel == 1)
 661                 info->fix.visual = FB_VISUAL_MONO01;
 662         else if (info->var.bits_per_pixel <= 8)
 663                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 664         else
 665                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 666
 667         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
 668         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
 669
 670         /* Re-initialize the DMA engine... */
 671         dev_dbg(info->device, "  * update DMA engine\n");
 672         atmel_lcdfb_update_dma(info, &info->var);
 673
 674         /* ...set frame size and burst length = 8 words (?) */
 675         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
 676         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 677         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
 678
 679         /* Now, the LCDC core... */
 680
 681         /* Set pixel clock */
 682         if (sinfo->config->have_alt_pixclock)
 683                 pix_factor = 1;
 684
 685         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 686
 687         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
 688
 689         if (value < pix_factor) {
 690                 dev_notice(info->device, "Bypassing pixel clock divider\n");
 691                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 692         } else {
 693                 value = (value / pix_factor) - 1;
 694                 dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
 695                                 value);
 696                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
 697                                 value << ATMEL_LCDC_CLKVAL_OFFSET);
 698                 info->var.pixclock =
 699                         KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1)));
 700                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
 701                                         PICOS2KHZ(info->var.pixclock));
 702         }
 703
 704
 705         /* Initialize control register 2 */
 706         value = pdata->default_lcdcon2;
 707
 708         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
 709                 value |= ATMEL_LCDC_INVLINE_INVERTED;
 710         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
 711                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
 712
 713         switch (info->var.bits_per_pixel) {
 714                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
 715                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
 716                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
 717                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
 718                 case 15: /* fall through */
 719                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
 720                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
 721                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
 722                 default: BUG(); break;
 723         }
 724         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
 725         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
 726
 727         /* Vertical timing */
 728         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 729         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
 730         value |= info->var.lower_margin;
 731         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
 732         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
 733
 734         /* Horizontal timing */
 735         value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 736         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 737         value |= (info->var.left_margin - 1);
 738         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
 739         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
 740
 741         /* Horizontal value (aka line size) */
 742         hozval_linesz = compute_hozval(sinfo, info->var.xres);
 743
 744         /* Display size */
 745         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 746         value |= info->var.yres - 1;
 747         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
 748         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
 749
 750         /* FIFO Threshold: Use formula from data sheet */
 751         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 752         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
 753
 754         /* Toggle LCD_MODE every frame */
 755         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
 756
 757         /* Disable all interrupts */
 758         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
 759         /* Enable FIFO & DMA errors */
 760         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
 761
 762         /* ...wait for DMA engine to become idle... */
 763         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 764                 msleep(10);
 765
 766         atmel_lcdfb_start(sinfo);
 767
 768         dev_dbg(info->device, "  * DONE\n");
 769
 770         return 0;
 771 }
 772
 773 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
 774 {
 775         chan &= 0xffff;
 776         chan >>= 16 - bf->length;
 777         return chan << bf->offset;
 778 }
 779
 780 /**
 781  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
 782  *      @regno: Which register in the CLUT we are programming
 783  *      @red: The red value which can be up to 16 bits wide
 784  *      @green: The green value which can be up to 16 bits wide
 785  *      @blue:  The blue value which can be up to 16 bits wide.
 786  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 787  *      @info: frame buffer info structure
 788  *
 789  *      Set a single color register. The values supplied have a 16 bit
 790  *      magnitude which needs to be scaled in this function for the hardware.
 791  *      Things to take into consideration are how many color registers, if
 792  *      any, are supported with the current color visual. With truecolor mode
 793  *      no color palettes are supported. Here a pseudo palette is created
 794  *      which we store the value in pseudo_palette in struct fb_info. For
 795  *      pseudocolor mode we have a limited color palette. To deal with this
 796  *      we can program what color is displayed for a particular pixel value.
 797  *      DirectColor is similar in that we can program each color field. If
 798  *      we have a static colormap we don't need to implement this function.
 799  *
 800  *      Returns negative errno on error, or zero on success. In an
 801  *      ideal world, this would have been the case, but as it turns
 802  *      out, the other drivers return 1 on failure, so that's what
 803  *      we're going to do.
 804  */
 805 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
 806                              unsigned int green, unsigned int blue,
 807                              unsigned int transp, struct fb_info *info)
 808 {
 809         struct atmel_lcdfb_info *sinfo = info->par;
 810         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 811         unsigned int val;
 812         u32 *pal;
 813         int ret = 1;
 814
 815         if (info->var.grayscale)
 816                 red = green = blue = (19595 * red + 38470 * green
 817                                       + 7471 * blue) >> 16;
 818
 819         switch (info->fix.visual) {
 820         case FB_VISUAL_TRUECOLOR:
 821                 if (regno < 16) {
 822                         pal = info->pseudo_palette;
 823
 824                         val  = chan_to_field(red, &info->var.red);
 825                         val |= chan_to_field(green, &info->var.green);
 826                         val |= chan_to_field(blue, &info->var.blue);
 827
 828                         pal[regno] = val;
 829                         ret = 0;
 830                 }
 831                 break;
 832
 833         case FB_VISUAL_PSEUDOCOLOR:
 834                 if (regno < 256) {
 835                         if (sinfo->config->have_intensity_bit) {
 836                                 /* old style I+BGR:555 */
 837                                 val  = ((red   >> 11) & 0x001f);
 838                                 val |= ((green >>  6) & 0x03e0);
 839                                 val |= ((blue  >>  1) & 0x7c00);
 840
 841                                 /*
 842                                  * TODO: intensity bit. Maybe something like
 843                                  *   ~(red[10] ^ green[10] ^ blue[10]) & 1
 844                                  */
 845                         } else {
 846                                 /* new style BGR:565 / RGB:565 */
 847                                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 848                                         val  = ((blue >> 11) & 0x001f);
 849                                         val |= ((red  >>  0) & 0xf800);
 850                                 } else {
 851                                         val  = ((red  >> 11) & 0x001f);
 852                                         val |= ((blue >>  0) & 0xf800);
 853                                 }
 854
 855                                 val |= ((green >>  5) & 0x07e0);
 856                         }
 857
 858                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 859                         ret = 0;
 860                 }
 861                 break;
 862
 863         case FB_VISUAL_MONO01:
 864                 if (regno < 2) {
 865                         val = (regno == 0) ? 0x00 : 0x1F;
 866                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 867                         ret = 0;
 868                 }
 869                 break;
 870
 871         }
 872
 873         return ret;
 874 }
 875
 876 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
 877                                struct fb_info *info)
 878 {
 879         dev_dbg(info->device, "%s\n", __func__);
 880
 881         atmel_lcdfb_update_dma(info, var);
 882
 883         return 0;
 884 }
 885
 886 static int atmel_lcdfb_blank(int blank_mode, struct fb_info *info)
 887 {
 888         struct atmel_lcdfb_info *sinfo = info->par;
 889
 890         switch (blank_mode) {
 891         case FB_BLANK_UNBLANK:
 892         case FB_BLANK_NORMAL:
 893                 atmel_lcdfb_start(sinfo);
 894                 break;
 895         case FB_BLANK_VSYNC_SUSPEND:
 896         case FB_BLANK_HSYNC_SUSPEND:
 897                 break;
 898         case FB_BLANK_POWERDOWN:
 899                 atmel_lcdfb_stop(sinfo);
 900                 break;
 901         default:
 902                 return -EINVAL;
 903         }
 904
 905         /* let fbcon do a soft blank for us */
 906         return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
 907 }
 908
 909 static struct fb_ops atmel_lcdfb_ops = {
 910         .owner          = THIS_MODULE,
 911         .fb_check_var   = atmel_lcdfb_check_var,
 912         .fb_set_par     = atmel_lcdfb_set_par,
 913         .fb_setcolreg   = atmel_lcdfb_setcolreg,
 914         .fb_blank       = atmel_lcdfb_blank,
 915         .fb_pan_display = atmel_lcdfb_pan_display,
 916         .fb_fillrect    = cfb_fillrect,
 917         .fb_copyarea    = cfb_copyarea,
 918         .fb_imageblit   = cfb_imageblit,
 919 };
 920
 921 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
 922 {
 923         struct fb_info *info = dev_id;
 924         struct atmel_lcdfb_info *sinfo = info->par;
 925         u32 status;
 926
 927         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
 928         if (status & ATMEL_LCDC_UFLWI) {
 929                 dev_warn(info->device, "FIFO underflow %#x\n", status);
 930                 /* reset DMA and FIFO to avoid screen shifting */
 931                 schedule_work(&sinfo->task);
 932         }
 933         lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
 934         return IRQ_HANDLED;
 935 }
 936
 937 /*
 938  * LCD controller task (to reset the LCD)
 939  */
 940 static void atmel_lcdfb_task(struct work_struct *work)
 941 {
 942         struct atmel_lcdfb_info *sinfo =
 943                 container_of(work, struct atmel_lcdfb_info, task);
 944
 945         atmel_lcdfb_reset(sinfo);
 946 }
 947
 948 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
 949 {
 950         struct fb_info *info = sinfo->info;
 951         int ret = 0;
 952
 953         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
 954
 955         dev_info(info->device,
 956                "%luKiB frame buffer at %08lx (mapped at %p)\n",
 957                (unsigned long)info->fix.smem_len / 1024,
 958                (unsigned long)info->fix.smem_start,
 959                info->screen_base);
 960
 961         /* Allocate colormap */
 962         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 963         if (ret < 0)
 964                 dev_err(info->device, "Alloc color map failed\n");
 965
 966         return ret;
 967 }
 968
 969 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
 970 {
 971         clk_prepare_enable(sinfo->bus_clk);
 972         clk_prepare_enable(sinfo->lcdc_clk);
 973 }
 974
 975 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
 976 {
 977         clk_disable_unprepare(sinfo->bus_clk);
 978         clk_disable_unprepare(sinfo->lcdc_clk);
 979 }
 980
 981 #ifdef CONFIG_OF
 982 static const struct of_device_id atmel_lcdfb_dt_ids[] = {
 983         { .compatible = "atmel,at91sam9261-lcdc" , .data = &at91sam9261_config, },
 984         { .compatible = "atmel,at91sam9263-lcdc" , .data = &at91sam9263_config, },
 985         { .compatible = "atmel,at91sam9g10-lcdc" , .data = &at91sam9g10_config, },
 986         { .compatible = "atmel,at91sam9g45-lcdc" , .data = &at91sam9g45_config, },
 987         { .compatible = "atmel,at91sam9g45es-lcdc" , .data = &at91sam9g45es_config, },
 988         { .compatible = "atmel,at91sam9rl-lcdc" , .data = &at91sam9rl_config, },
 989         { .compatible = "atmel,at32ap-lcdc" , .data = &at32ap_config, },
 990         { /* sentinel */ }
 991 };
 992
 993 MODULE_DEVICE_TABLE(of, atmel_lcdfb_dt_ids);
 994
 995 static const char *atmel_lcdfb_wiring_modes[] = {
 996         [ATMEL_LCDC_WIRING_BGR] = "BRG",
 997         [ATMEL_LCDC_WIRING_RGB] = "RGB",
 998 };
 999
1000 static int atmel_lcdfb_get_of_wiring_modes(struct device_node *np)
1001 {
1002         const char *mode;
1003         int err, i;
1004
1005         err = of_property_read_string(np, "atmel,lcd-wiring-mode", &mode);
1006         if (err < 0)
1007                 return ATMEL_LCDC_WIRING_BGR;
1008
1009         for (i = 0; i < ARRAY_SIZE(atmel_lcdfb_wiring_modes); i++)
1010                 if (!strcasecmp(mode, atmel_lcdfb_wiring_modes[i]))
1011                         return i;
1012
1013         return -ENODEV;
1014 }
1015
1016 static void atmel_lcdfb_power_control_gpio(struct atmel_lcdfb_pdata *pdata, int on)
1017 {
1018         struct atmel_lcdfb_power_ctrl_gpio *og;
1019
1020         list_for_each_entry(og, &pdata->pwr_gpios, list)
1021                 gpio_set_value(og->gpio, on);
1022 }
1023
1024 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
1025 {
1026         struct fb_info *info = sinfo->info;
1027         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
1028         struct fb_var_screeninfo *var = &info->var;
1029         struct device *dev = &sinfo->pdev->dev;
1030         struct device_node *np =dev->of_node;
1031         struct device_node *display_np;
1032         struct device_node *timings_np;
1033         struct display_timings *timings;
1034         enum of_gpio_flags flags;
1035         struct atmel_lcdfb_power_ctrl_gpio *og;
1036         bool is_gpio_power = false;
1037         int ret = -ENOENT;
1038         int i, gpio;
1039
1040         sinfo->config = (struct atmel_lcdfb_config*)
1041                 of_match_device(atmel_lcdfb_dt_ids, dev)->data;
1042
1043         display_np = of_parse_phandle(np, "display", 0);
1044         if (!display_np) {
1045                 dev_err(dev, "failed to find display phandle\n");
1046                 return -ENOENT;
1047         }
1048
1049         ret = of_property_read_u32(display_np, "bits-per-pixel", &var->bits_per_pixel);
1050         if (ret < 0) {
1051                 dev_err(dev, "failed to get property bits-per-pixel\n");
1052                 goto put_display_node;
1053         }
1054
1055         ret = of_property_read_u32(display_np, "atmel,guard-time", &pdata->guard_time);
1056         if (ret < 0) {
1057                 dev_err(dev, "failed to get property atmel,guard-time\n");
1058                 goto put_display_node;
1059         }
1060
1061         ret = of_property_read_u32(display_np, "atmel,lcdcon2", &pdata->default_lcdcon2);
1062         if (ret < 0) {
1063                 dev_err(dev, "failed to get property atmel,lcdcon2\n");
1064                 goto put_display_node;
1065         }
1066
1067         ret = of_property_read_u32(display_np, "atmel,dmacon", &pdata->default_dmacon);
1068         if (ret < 0) {
1069                 dev_err(dev, "failed to get property bits-per-pixel\n");
1070                 goto put_display_node;
1071         }
1072
1073         INIT_LIST_HEAD(&pdata->pwr_gpios);
1074         ret = -ENOMEM;
1075         for (i = 0; i < of_gpio_named_count(display_np, "atmel,power-control-gpio"); i++) {
1076                 gpio = of_get_named_gpio_flags(display_np, "atmel,power-control-gpio",
1077                                                i, &flags);
1078                 if (gpio < 0)
1079                         continue;
1080
1081                 og = devm_kzalloc(dev, sizeof(*og), GFP_KERNEL);
1082                 if (!og)
1083                         goto put_display_node;
1084
1085                 og->gpio = gpio;
1086                 og->active_low = flags & OF_GPIO_ACTIVE_LOW;
1087                 is_gpio_power = true;
1088                 ret = devm_gpio_request(dev, gpio, "lcd-power-control-gpio");
1089                 if (ret) {
1090                         dev_err(dev, "request gpio %d failed\n", gpio);
1091                         goto put_display_node;
1092                 }
1093
1094                 ret = gpio_direction_output(gpio, og->active_low);
1095                 if (ret) {
1096                         dev_err(dev, "set direction output gpio %d failed\n", gpio);
1097                         goto put_display_node;
1098                 }
1099                 list_add(&og->list, &pdata->pwr_gpios);
1100         }
1101
1102         if (is_gpio_power)
1103                 pdata->atmel_lcdfb_power_control = atmel_lcdfb_power_control_gpio;
1104
1105         ret = atmel_lcdfb_get_of_wiring_modes(display_np);
1106         if (ret < 0) {
1107                 dev_err(dev, "invalid atmel,lcd-wiring-mode\n");
1108                 goto put_display_node;
1109         }
1110         pdata->lcd_wiring_mode = ret;
1111
1112         pdata->lcdcon_is_backlight = of_property_read_bool(display_np, "atmel,lcdcon-backlight");
1113         pdata->lcdcon_pol_negative = of_property_read_bool(display_np, "atmel,lcdcon-backlight-inverted");
1114
1115         timings = of_get_display_timings(display_np);
1116         if (!timings) {
1117                 dev_err(dev, "failed to get display timings\n");
1118                 ret = -EINVAL;
1119                 goto put_display_node;
1120         }
1121
1122         timings_np = of_find_node_by_name(display_np, "display-timings");
1123         if (!timings_np) {
1124                 dev_err(dev, "failed to find display-timings node\n");
1125                 ret = -ENODEV;
1126                 goto put_display_node;
1127         }
1128
1129         for (i = 0; i < of_get_child_count(timings_np); i++) {
1130                 struct videomode vm;
1131                 struct fb_videomode fb_vm;
1132
1133                 ret = videomode_from_timings(timings, &vm, i);
1134                 if (ret < 0)
1135                         goto put_timings_node;
1136                 ret = fb_videomode_from_videomode(&vm, &fb_vm);
1137                 if (ret < 0)
1138                         goto put_timings_node;
1139
1140                 fb_add_videomode(&fb_vm, &info->modelist);
1141         }
1142
1143         return 0;
1144
1145 put_timings_node:
1146         of_node_put(timings_np);
1147 put_display_node:
1148         of_node_put(display_np);
1149         return ret;
1150 }
1151 #else
1152 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
1153 {
1154         return 0;
1155 }
1156 #endif
1157
1158 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
1159 {
1160         struct device *dev = &pdev->dev;
1161         struct fb_info *info;
1162         struct atmel_lcdfb_info *sinfo;
1163         struct atmel_lcdfb_pdata *pdata = NULL;
1164         struct resource *regs = NULL;
1165         struct resource *map = NULL;
1166         struct fb_modelist *modelist;
1167         int ret;
1168
1169         dev_dbg(dev, "%s BEGIN\n", __func__);
1170
1171         ret = -ENOMEM;
1172         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
1173         if (!info) {
1174                 dev_err(dev, "cannot allocate memory\n");
1175                 goto out;
1176         }
1177
1178         sinfo = info->par;
1179         sinfo->pdev = pdev;
1180         sinfo->info = info;
1181
1182         INIT_LIST_HEAD(&info->modelist);
1183
1184         if (pdev->dev.of_node) {
1185                 ret = atmel_lcdfb_of_init(sinfo);
1186                 if (ret)
1187                         goto free_info;
1188         } else if (dev_get_platdata(dev)) {
1189                 struct fb_monspecs *monspecs;
1190                 int i;
1191
1192                 pdata = dev_get_platdata(dev);
1193                 monspecs = pdata->default_monspecs;
1194                 sinfo->pdata = *pdata;
1195
1196                 for (i = 0; i < monspecs->modedb_len; i++)
1197                         fb_add_videomode(&monspecs->modedb[i], &info->modelist);
1198
1199                 sinfo->config = atmel_lcdfb_get_config(pdev);
1200
1201                 info->var.bits_per_pixel = pdata->default_bpp ? pdata->default_bpp : 16;
1202                 memcpy(&info->monspecs, pdata->default_monspecs, sizeof(info->monspecs));
1203         } else {
1204                 dev_err(dev, "cannot get default configuration\n");
1205                 goto free_info;
1206         }
1207
1208         if (!sinfo->config)
1209                 goto free_info;
1210
1211         sinfo->reg_lcd = devm_regulator_get(&pdev->dev, "lcd");
1212         if (IS_ERR(sinfo->reg_lcd))
1213                 sinfo->reg_lcd = NULL;
1214
1215         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
1216         info->pseudo_palette = sinfo->pseudo_palette;
1217         info->fbops = &atmel_lcdfb_ops;
1218
1219         info->fix = atmel_lcdfb_fix;
1220         strcpy(info->fix.id, sinfo->pdev->name);
1221
1222         /* Enable LCDC Clocks */
1223         sinfo->bus_clk = clk_get(dev, "hclk");
1224         if (IS_ERR(sinfo->bus_clk)) {
1225                 ret = PTR_ERR(sinfo->bus_clk);
1226                 goto free_info;
1227         }
1228         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
1229         if (IS_ERR(sinfo->lcdc_clk)) {
1230                 ret = PTR_ERR(sinfo->lcdc_clk);
1231                 goto put_bus_clk;
1232         }
1233         atmel_lcdfb_start_clock(sinfo);
1234
1235         modelist = list_first_entry(&info->modelist,
1236                         struct fb_modelist, list);
1237         fb_videomode_to_var(&info->var, &modelist->mode);
1238
1239         atmel_lcdfb_check_var(&info->var, info);
1240
1241         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1242         if (!regs) {
1243                 dev_err(dev, "resources unusable\n");
1244                 ret = -ENXIO;
1245                 goto stop_clk;
1246         }
1247
1248         sinfo->irq_base = platform_get_irq(pdev, 0);
1249         if (sinfo->irq_base < 0) {
1250                 dev_err(dev, "unable to get irq\n");
1251                 ret = sinfo->irq_base;
1252                 goto stop_clk;
1253         }
1254
1255         /* Initialize video memory */
1256         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1257         if (map) {
1258                 /* use a pre-allocated memory buffer */
1259                 info->fix.smem_start = map->start;
1260                 info->fix.smem_len = resource_size(map);
1261                 if (!request_mem_region(info->fix.smem_start,
1262                                         info->fix.smem_len, pdev->name)) {
1263                         ret = -EBUSY;
1264                         goto stop_clk;
1265                 }
1266
1267                 info->screen_base = ioremap_wc(info->fix.smem_start,
1268                                                info->fix.smem_len);
1269                 if (!info->screen_base) {
1270                         ret = -ENOMEM;
1271                         goto release_intmem;
1272                 }
1273
1274                 /*
1275                  * Don't clear the framebuffer -- someone may have set
1276                  * up a splash image.
1277                  */
1278         } else {
1279                 /* allocate memory buffer */
1280                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
1281                 if (ret < 0) {
1282                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
1283                         goto stop_clk;
1284                 }
1285         }
1286
1287         /* LCDC registers */
1288         info->fix.mmio_start = regs->start;
1289         info->fix.mmio_len = resource_size(regs);
1290
1291         if (!request_mem_region(info->fix.mmio_start,
1292                                 info->fix.mmio_len, pdev->name)) {
1293                 ret = -EBUSY;
1294                 goto free_fb;
1295         }
1296
1297         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
1298         if (!sinfo->mmio) {
1299                 dev_err(dev, "cannot map LCDC registers\n");
1300                 ret = -ENOMEM;
1301                 goto release_mem;
1302         }
1303
1304         /* Initialize PWM for contrast or backlight ("off") */
1305         init_contrast(sinfo);
1306
1307         /* interrupt */
1308         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
1309         if (ret) {
1310                 dev_err(dev, "request_irq failed: %d\n", ret);
1311                 goto unmap_mmio;
1312         }
1313
1314         /* Some operations on the LCDC might sleep and
1315          * require a preemptible task context */
1316         INIT_WORK(&sinfo->task, atmel_lcdfb_task);
1317
1318         ret = atmel_lcdfb_init_fbinfo(sinfo);
1319         if (ret < 0) {
1320                 dev_err(dev, "init fbinfo failed: %d\n", ret);
1321                 goto unregister_irqs;
1322         }
1323
1324         ret = atmel_lcdfb_set_par(info);
1325         if (ret < 0) {
1326                 dev_err(dev, "set par failed: %d\n", ret);
1327                 goto unregister_irqs;
1328         }
1329
1330         dev_set_drvdata(dev, info);
1331
1332         /*
1333          * Tell the world that we're ready to go
1334          */
1335         ret = register_framebuffer(info);
1336         if (ret < 0) {
1337                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
1338                 goto reset_drvdata;
1339         }
1340
1341         /* Power up the LCDC screen */
1342         atmel_lcdfb_power_control(sinfo, 1);
1343
1344         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1345                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
1346
1347         return 0;
1348
1349 reset_drvdata:
1350         dev_set_drvdata(dev, NULL);
1351         fb_dealloc_cmap(&info->cmap);
1352 unregister_irqs:
1353         cancel_work_sync(&sinfo->task);
1354         free_irq(sinfo->irq_base, info);
1355 unmap_mmio:
1356         exit_backlight(sinfo);
1357         iounmap(sinfo->mmio);
1358 release_mem:
1359         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1360 free_fb:
1361         if (map)
1362                 iounmap(info->screen_base);
1363         else
1364                 atmel_lcdfb_free_video_memory(sinfo);
1365
1366 release_intmem:
1367         if (map)
1368                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1369 stop_clk:
1370         atmel_lcdfb_stop_clock(sinfo);
1371         clk_put(sinfo->lcdc_clk);
1372 put_bus_clk:
1373         clk_put(sinfo->bus_clk);
1374 free_info:
1375         framebuffer_release(info);
1376 out:
1377         dev_dbg(dev, "%s FAILED\n", __func__);
1378         return ret;
1379 }
1380
1381 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1382 {
1383         struct device *dev = &pdev->dev;
1384         struct fb_info *info = dev_get_drvdata(dev);
1385         struct atmel_lcdfb_info *sinfo;
1386         struct atmel_lcdfb_pdata *pdata;
1387
1388         if (!info || !info->par)
1389                 return 0;
1390         sinfo = info->par;
1391         pdata = &sinfo->pdata;
1392
1393         cancel_work_sync(&sinfo->task);
1394         exit_backlight(sinfo);
1395         atmel_lcdfb_power_control(sinfo, 0);
1396         unregister_framebuffer(info);
1397         atmel_lcdfb_stop_clock(sinfo);
1398         clk_put(sinfo->lcdc_clk);
1399         clk_put(sinfo->bus_clk);
1400         fb_dealloc_cmap(&info->cmap);
1401         free_irq(sinfo->irq_base, info);
1402         iounmap(sinfo->mmio);
1403         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1404         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1405                 iounmap(info->screen_base);
1406                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1407         } else {
1408                 atmel_lcdfb_free_video_memory(sinfo);
1409         }
1410
1411         framebuffer_release(info);
1412
1413         return 0;
1414 }
1415
1416 #ifdef CONFIG_PM
1417
1418 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1419 {
1420         struct fb_info *info = platform_get_drvdata(pdev);
1421         struct atmel_lcdfb_info *sinfo = info->par;
1422
1423         /*
1424          * We don't want to handle interrupts while the clock is
1425          * stopped. It may take forever.
1426          */
1427         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1428
1429         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_CTR);
1430         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1431         atmel_lcdfb_power_control(sinfo, 0);
1432         atmel_lcdfb_stop(sinfo);
1433         atmel_lcdfb_stop_clock(sinfo);
1434
1435         return 0;
1436 }
1437
1438 static int atmel_lcdfb_resume(struct platform_device *pdev)
1439 {
1440         struct fb_info *info = platform_get_drvdata(pdev);
1441         struct atmel_lcdfb_info *sinfo = info->par;
1442
1443         atmel_lcdfb_start_clock(sinfo);
1444         atmel_lcdfb_start(sinfo);
1445         atmel_lcdfb_power_control(sinfo, 1);
1446         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1447
1448         /* Enable FIFO & DMA errors */
1449         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1450                         | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1451
1452         return 0;
1453 }
1454
1455 #else
1456 #define atmel_lcdfb_suspend     NULL
1457 #define atmel_lcdfb_resume      NULL
1458 #endif
1459
1460 static struct platform_driver atmel_lcdfb_driver = {
1461         .remove         = __exit_p(atmel_lcdfb_remove),
1462         .suspend        = atmel_lcdfb_suspend,
1463         .resume         = atmel_lcdfb_resume,
1464         .id_table       = atmel_lcdfb_devtypes,
1465         .driver         = {
1466                 .name   = "atmel_lcdfb",
1467                 .of_match_table = of_match_ptr(atmel_lcdfb_dt_ids),
1468         },
1469 };
1470
1471 module_platform_driver_probe(atmel_lcdfb_driver, atmel_lcdfb_probe);
1472
1473 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1474 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1475 MODULE_LICENSE("GPL");