drivers/video/fbdev/atmel_lcdfb.c

   1 /*
   2  *  Driver for AT91/AT32 LCD Controller
   3  *
   4  *  Copyright (C) 2007 Atmel Corporation
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file COPYING in the main directory of this archive for
   8  * more details.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/dma-mapping.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/clk.h>
  16 #include <linux/fb.h>
  17 #include <linux/init.h>
  18 #include <linux/delay.h>
  19 #include <linux/backlight.h>
  20 #include <linux/gfp.h>
  21 #include <linux/module.h>
  22 #include <linux/platform_data/atmel.h>
  23 #include <linux/of.h>
  24 #include <linux/of_device.h>
  25 #include <linux/of_gpio.h>
  26 #include <video/of_display_timing.h>
  27 #include <linux/regulator/consumer.h>
  28 #include <video/videomode.h>
  29
  30 #include <mach/cpu.h>
  31 #include <asm/gpio.h>
  32
  33 #include <video/atmel_lcdc.h>
  34
  35 struct atmel_lcdfb_config {
  36         bool have_alt_pixclock;
  37         bool have_hozval;
  38         bool have_intensity_bit;
  39 };
  40
  41  /* LCD Controller info data structure, stored in device platform_data */
  42 struct atmel_lcdfb_info {
  43         spinlock_t              lock;
  44         struct fb_info          *info;
  45         void __iomem            *mmio;
  46         int                     irq_base;
  47         struct work_struct      task;
  48
  49         unsigned int            smem_len;
  50         struct platform_device  *pdev;
  51         struct clk              *bus_clk;
  52         struct clk              *lcdc_clk;
  53
  54         struct backlight_device *backlight;
  55         u8                      bl_power;
  56         u8                      saved_lcdcon;
  57
  58         u32                     pseudo_palette[16];
  59         bool                    have_intensity_bit;
  60
  61         struct atmel_lcdfb_pdata pdata;
  62
  63         struct atmel_lcdfb_config *config;
  64         struct regulator        *reg_lcd;
  65 };
  66
  67 struct atmel_lcdfb_power_ctrl_gpio {
  68         int gpio;
  69         int active_low;
  70
  71         struct list_head list;
  72 };
  73
  74 #define lcdc_readl(sinfo, reg)          __raw_readl((sinfo)->mmio+(reg))
  75 #define lcdc_writel(sinfo, reg, val)    __raw_writel((val), (sinfo)->mmio+(reg))
  76
  77 /* configurable parameters */
  78 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
  79 #define ATMEL_LCDC_DMA_BURST_LEN        8       /* words */
  80 #define ATMEL_LCDC_FIFO_SIZE            512     /* words */
  81
  82 static struct atmel_lcdfb_config at91sam9261_config = {
  83         .have_hozval            = true,
  84         .have_intensity_bit     = true,
  85 };
  86
  87 static struct atmel_lcdfb_config at91sam9263_config = {
  88         .have_intensity_bit     = true,
  89 };
  90
  91 static struct atmel_lcdfb_config at91sam9g10_config = {
  92         .have_hozval            = true,
  93 };
  94
  95 static struct atmel_lcdfb_config at91sam9g45_config = {
  96         .have_alt_pixclock      = true,
  97 };
  98
  99 static struct atmel_lcdfb_config at91sam9g45es_config = {
 100 };
 101
 102 static struct atmel_lcdfb_config at91sam9rl_config = {
 103         .have_intensity_bit     = true,
 104 };
 105
 106 static struct atmel_lcdfb_config at32ap_config = {
 107         .have_hozval            = true,
 108 };
 109
 110 static const struct platform_device_id atmel_lcdfb_devtypes[] = {
 111         {
 112                 .name = "at91sam9261-lcdfb",
 113                 .driver_data = (unsigned long)&at91sam9261_config,
 114         }, {
 115                 .name = "at91sam9263-lcdfb",
 116                 .driver_data = (unsigned long)&at91sam9263_config,
 117         }, {
 118                 .name = "at91sam9g10-lcdfb",
 119                 .driver_data = (unsigned long)&at91sam9g10_config,
 120         }, {
 121                 .name = "at91sam9g45-lcdfb",
 122                 .driver_data = (unsigned long)&at91sam9g45_config,
 123         }, {
 124                 .name = "at91sam9g45es-lcdfb",
 125                 .driver_data = (unsigned long)&at91sam9g45es_config,
 126         }, {
 127                 .name = "at91sam9rl-lcdfb",
 128                 .driver_data = (unsigned long)&at91sam9rl_config,
 129         }, {
 130                 .name = "at32ap-lcdfb",
 131                 .driver_data = (unsigned long)&at32ap_config,
 132         }, {
 133                 /* terminator */
 134         }
 135 };
 136 MODULE_DEVICE_TABLE(platform, atmel_lcdfb_devtypes);
 137
 138 static struct atmel_lcdfb_config *
 139 atmel_lcdfb_get_config(struct platform_device *pdev)
 140 {
 141         unsigned long data;
 142
 143         data = platform_get_device_id(pdev)->driver_data;
 144
 145         return (struct atmel_lcdfb_config *)data;
 146 }
 147
 148 #if defined(CONFIG_ARCH_AT91)
 149 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
 150                                          | FBINFO_PARTIAL_PAN_OK \
 151                                          | FBINFO_HWACCEL_YPAN)
 152
 153 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
 154                                         struct fb_var_screeninfo *var,
 155                                         struct fb_info *info)
 156 {
 157
 158 }
 159 #elif defined(CONFIG_AVR32)
 160 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
 161                                         | FBINFO_PARTIAL_PAN_OK \
 162                                         | FBINFO_HWACCEL_XPAN \
 163                                         | FBINFO_HWACCEL_YPAN)
 164
 165 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
 166                                      struct fb_var_screeninfo *var,
 167                                      struct fb_info *info)
 168 {
 169         u32 dma2dcfg;
 170         u32 pixeloff;
 171
 172         pixeloff = (var->xoffset * info->var.bits_per_pixel) & 0x1f;
 173
 174         dma2dcfg = (info->var.xres_virtual - info->var.xres)
 175                  * info->var.bits_per_pixel / 8;
 176         dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
 177         lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
 178
 179         /* Update configuration */
 180         lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
 181                     lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
 182                     | ATMEL_LCDC_DMAUPDT);
 183 }
 184 #endif
 185
 186 static u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
 187                 | ATMEL_LCDC_POL_POSITIVE
 188                 | ATMEL_LCDC_ENA_PWMENABLE;
 189
 190 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
 191
 192 /* some bl->props field just changed */
 193 static int atmel_bl_update_status(struct backlight_device *bl)
 194 {
 195         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 196         int                     power = sinfo->bl_power;
 197         int                     brightness = bl->props.brightness;
 198
 199         /* REVISIT there may be a meaningful difference between
 200          * fb_blank and power ... there seem to be some cases
 201          * this doesn't handle correctly.
 202          */
 203         if (bl->props.fb_blank != sinfo->bl_power)
 204                 power = bl->props.fb_blank;
 205         else if (bl->props.power != sinfo->bl_power)
 206                 power = bl->props.power;
 207
 208         if (brightness < 0 && power == FB_BLANK_UNBLANK)
 209                 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 210         else if (power != FB_BLANK_UNBLANK)
 211                 brightness = 0;
 212
 213         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
 214         if (contrast_ctr & ATMEL_LCDC_POL_POSITIVE)
 215                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
 216                         brightness ? contrast_ctr : 0);
 217         else
 218                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 219
 220         bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
 221
 222         return 0;
 223 }
 224
 225 static int atmel_bl_get_brightness(struct backlight_device *bl)
 226 {
 227         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 228
 229         return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 230 }
 231
 232 static const struct backlight_ops atmel_lcdc_bl_ops = {
 233         .update_status = atmel_bl_update_status,
 234         .get_brightness = atmel_bl_get_brightness,
 235 };
 236
 237 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 238 {
 239         struct backlight_properties props;
 240         struct backlight_device *bl;
 241
 242         sinfo->bl_power = FB_BLANK_UNBLANK;
 243
 244         if (sinfo->backlight)
 245                 return;
 246
 247         memset(&props, 0, sizeof(struct backlight_properties));
 248         props.type = BACKLIGHT_RAW;
 249         props.max_brightness = 0xff;
 250         bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo,
 251                                        &atmel_lcdc_bl_ops, &props);
 252         if (IS_ERR(bl)) {
 253                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
 254                                 PTR_ERR(bl));
 255                 return;
 256         }
 257         sinfo->backlight = bl;
 258
 259         bl->props.power = FB_BLANK_UNBLANK;
 260         bl->props.fb_blank = FB_BLANK_UNBLANK;
 261         bl->props.brightness = atmel_bl_get_brightness(bl);
 262 }
 263
 264 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 265 {
 266         if (!sinfo->backlight)
 267                 return;
 268
 269         if (sinfo->backlight->ops) {
 270                 sinfo->backlight->props.power = FB_BLANK_POWERDOWN;
 271                 sinfo->backlight->ops->update_status(sinfo->backlight);
 272         }
 273         backlight_device_unregister(sinfo->backlight);
 274 }
 275
 276 #else
 277
 278 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 279 {
 280         dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
 281 }
 282
 283 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 284 {
 285 }
 286
 287 #endif
 288
 289 static void init_contrast(struct atmel_lcdfb_info *sinfo)
 290 {
 291         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 292
 293         /* contrast pwm can be 'inverted' */
 294         if (pdata->lcdcon_pol_negative)
 295                 contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
 296
 297         /* have some default contrast/backlight settings */
 298         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 299         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 300
 301         if (pdata->lcdcon_is_backlight)
 302                 init_backlight(sinfo);
 303 }
 304
 305 static inline void atmel_lcdfb_power_control(struct atmel_lcdfb_info *sinfo, int on)
 306 {
 307         int ret;
 308         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 309
 310         if (pdata->atmel_lcdfb_power_control)
 311                 pdata->atmel_lcdfb_power_control(pdata, on);
 312         else if (sinfo->reg_lcd) {
 313                 if (on) {
 314                         ret = regulator_enable(sinfo->reg_lcd);
 315                         if (ret)
 316                                 dev_err(&sinfo->pdev->dev,
 317                                         "lcd regulator enable failed:   %d\n", ret);
 318                 } else {
 319                         ret = regulator_disable(sinfo->reg_lcd);
 320                         if (ret)
 321                                 dev_err(&sinfo->pdev->dev,
 322                                         "lcd regulator disable failed: %d\n", ret);
 323                 }
 324         }
 325 }
 326
 327 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
 328         .type           = FB_TYPE_PACKED_PIXELS,
 329         .visual         = FB_VISUAL_TRUECOLOR,
 330         .xpanstep       = 0,
 331         .ypanstep       = 1,
 332         .ywrapstep      = 0,
 333         .accel          = FB_ACCEL_NONE,
 334 };
 335
 336 static unsigned long compute_hozval(struct atmel_lcdfb_info *sinfo,
 337                                                         unsigned long xres)
 338 {
 339         unsigned long lcdcon2;
 340         unsigned long value;
 341
 342         if (!sinfo->config->have_hozval)
 343                 return xres;
 344
 345         lcdcon2 = lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2);
 346         value = xres;
 347         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
 348                 /* STN display */
 349                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
 350                         value *= 3;
 351                 }
 352                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
 353                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
 354                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
 355                         value = DIV_ROUND_UP(value, 4);
 356                 else
 357                         value = DIV_ROUND_UP(value, 8);
 358         }
 359
 360         return value;
 361 }
 362
 363 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
 364 {
 365         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 366
 367         /* Turn off the LCD controller and the DMA controller */
 368         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 369                         pdata->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
 370
 371         /* Wait for the LCDC core to become idle */
 372         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 373                 msleep(10);
 374
 375         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
 376 }
 377
 378 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
 379 {
 380         atmel_lcdfb_stop_nowait(sinfo);
 381
 382         /* Wait for DMA engine to become idle... */
 383         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 384                 msleep(10);
 385 }
 386
 387 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
 388 {
 389         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 390
 391         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, pdata->default_dmacon);
 392         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 393                 (pdata->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
 394                 | ATMEL_LCDC_PWR);
 395 }
 396
 397 static void atmel_lcdfb_update_dma(struct fb_info *info,
 398                                struct fb_var_screeninfo *var)
 399 {
 400         struct atmel_lcdfb_info *sinfo = info->par;
 401         struct fb_fix_screeninfo *fix = &info->fix;
 402         unsigned long dma_addr;
 403
 404         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
 405                     + var->xoffset * info->var.bits_per_pixel / 8);
 406
 407         dma_addr &= ~3UL;
 408
 409         /* Set framebuffer DMA base address and pixel offset */
 410         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
 411
 412         atmel_lcdfb_update_dma2d(sinfo, var, info);
 413 }
 414
 415 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
 416 {
 417         struct fb_info *info = sinfo->info;
 418
 419         dma_free_writecombine(info->device, info->fix.smem_len,
 420                                 info->screen_base, info->fix.smem_start);
 421 }
 422
 423 /**
 424  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
 425  *      @sinfo: the frame buffer to allocate memory for
 426  *
 427  *      This function is called only from the atmel_lcdfb_probe()
 428  *      so no locking by fb_info->mm_lock around smem_len setting is needed.
 429  */
 430 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
 431 {
 432         struct fb_info *info = sinfo->info;
 433         struct fb_var_screeninfo *var = &info->var;
 434         unsigned int smem_len;
 435
 436         smem_len = (var->xres_virtual * var->yres_virtual
 437                     * ((var->bits_per_pixel + 7) / 8));
 438         info->fix.smem_len = max(smem_len, sinfo->smem_len);
 439
 440         info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
 441                                         (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
 442
 443         if (!info->screen_base) {
 444                 return -ENOMEM;
 445         }
 446
 447         memset(info->screen_base, 0, info->fix.smem_len);
 448
 449         return 0;
 450 }
 451
 452 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
 453                                                      struct fb_info *info)
 454 {
 455         struct fb_videomode varfbmode;
 456         const struct fb_videomode *fbmode = NULL;
 457
 458         fb_var_to_videomode(&varfbmode, var);
 459         fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
 460         if (fbmode)
 461                 fb_videomode_to_var(var, fbmode);
 462         return fbmode;
 463 }
 464
 465
 466 /**
 467  *      atmel_lcdfb_check_var - Validates a var passed in.
 468  *      @var: frame buffer variable screen structure
 469  *      @info: frame buffer structure that represents a single frame buffer
 470  *
 471  *      Checks to see if the hardware supports the state requested by
 472  *      var passed in. This function does not alter the hardware
 473  *      state!!!  This means the data stored in struct fb_info and
 474  *      struct atmel_lcdfb_info do not change. This includes the var
 475  *      inside of struct fb_info.  Do NOT change these. This function
 476  *      can be called on its own if we intent to only test a mode and
 477  *      not actually set it. The stuff in modedb.c is a example of
 478  *      this. If the var passed in is slightly off by what the
 479  *      hardware can support then we alter the var PASSED in to what
 480  *      we can do. If the hardware doesn't support mode change a
 481  *      -EINVAL will be returned by the upper layers. You don't need
 482  *      to implement this function then. If you hardware doesn't
 483  *      support changing the resolution then this function is not
 484  *      needed. In this case the driver would just provide a var that
 485  *      represents the static state the screen is in.
 486  *
 487  *      Returns negative errno on error, or zero on success.
 488  */
 489 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
 490                              struct fb_info *info)
 491 {
 492         struct device *dev = info->device;
 493         struct atmel_lcdfb_info *sinfo = info->par;
 494         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 495         unsigned long clk_value_khz;
 496
 497         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 498
 499         dev_dbg(dev, "%s:\n", __func__);
 500
 501         if (!(var->pixclock && var->bits_per_pixel)) {
 502                 /* choose a suitable mode if possible */
 503                 if (!atmel_lcdfb_choose_mode(var, info)) {
 504                         dev_err(dev, "needed value not specified\n");
 505                         return -EINVAL;
 506                 }
 507         }
 508
 509         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
 510         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
 511         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
 512         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
 513
 514         if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
 515                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
 516                 return -EINVAL;
 517         }
 518
 519         /* Do not allow to have real resoulution larger than virtual */
 520         if (var->xres > var->xres_virtual)
 521                 var->xres_virtual = var->xres;
 522
 523         if (var->yres > var->yres_virtual)
 524                 var->yres_virtual = var->yres;
 525
 526         /* Force same alignment for each line */
 527         var->xres = (var->xres + 3) & ~3UL;
 528         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
 529
 530         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
 531         var->transp.msb_right = 0;
 532         var->transp.offset = var->transp.length = 0;
 533         var->xoffset = var->yoffset = 0;
 534
 535         if (info->fix.smem_len) {
 536                 unsigned int smem_len = (var->xres_virtual * var->yres_virtual
 537                                          * ((var->bits_per_pixel + 7) / 8));
 538                 if (smem_len > info->fix.smem_len) {
 539                         dev_err(dev, "Frame buffer is too small (%u) for screen size (need at least %u)\n",
 540                                 info->fix.smem_len, smem_len);
 541                         return -EINVAL;
 542                 }
 543         }
 544
 545         /* Saturate vertical and horizontal timings at maximum values */
 546         var->vsync_len = min_t(u32, var->vsync_len,
 547                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
 548         var->upper_margin = min_t(u32, var->upper_margin,
 549                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
 550         var->lower_margin = min_t(u32, var->lower_margin,
 551                         ATMEL_LCDC_VFP);
 552         var->right_margin = min_t(u32, var->right_margin,
 553                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
 554         var->hsync_len = min_t(u32, var->hsync_len,
 555                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
 556         var->left_margin = min_t(u32, var->left_margin,
 557                         ATMEL_LCDC_HBP + 1);
 558
 559         /* Some parameters can't be zero */
 560         var->vsync_len = max_t(u32, var->vsync_len, 1);
 561         var->right_margin = max_t(u32, var->right_margin, 1);
 562         var->hsync_len = max_t(u32, var->hsync_len, 1);
 563         var->left_margin = max_t(u32, var->left_margin, 1);
 564
 565         switch (var->bits_per_pixel) {
 566         case 1:
 567         case 2:
 568         case 4:
 569         case 8:
 570                 var->red.offset = var->green.offset = var->blue.offset = 0;
 571                 var->red.length = var->green.length = var->blue.length
 572                         = var->bits_per_pixel;
 573                 break;
 574         case 16:
 575                 /* Older SOCs use IBGR:555 rather than BGR:565. */
 576                 if (sinfo->config->have_intensity_bit)
 577                         var->green.length = 5;
 578                 else
 579                         var->green.length = 6;
 580
 581                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 582                         /* RGB:5X5 mode */
 583                         var->red.offset = var->green.length + 5;
 584                         var->blue.offset = 0;
 585                 } else {
 586                         /* BGR:5X5 mode */
 587                         var->red.offset = 0;
 588                         var->blue.offset = var->green.length + 5;
 589                 }
 590                 var->green.offset = 5;
 591                 var->red.length = var->blue.length = 5;
 592                 break;
 593         case 32:
 594                 var->transp.offset = 24;
 595                 var->transp.length = 8;
 596                 /* fall through */
 597         case 24:
 598                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 599                         /* RGB:888 mode */
 600                         var->red.offset = 16;
 601                         var->blue.offset = 0;
 602                 } else {
 603                         /* BGR:888 mode */
 604                         var->red.offset = 0;
 605                         var->blue.offset = 16;
 606                 }
 607                 var->green.offset = 8;
 608                 var->red.length = var->green.length = var->blue.length = 8;
 609                 break;
 610         default:
 611                 dev_err(dev, "color depth %d not supported\n",
 612                                         var->bits_per_pixel);
 613                 return -EINVAL;
 614         }
 615
 616         return 0;
 617 }
 618
 619 /*
 620  * LCD reset sequence
 621  */
 622 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
 623 {
 624         might_sleep();
 625
 626         atmel_lcdfb_stop(sinfo);
 627         atmel_lcdfb_start(sinfo);
 628 }
 629
 630 /**
 631  *      atmel_lcdfb_set_par - Alters the hardware state.
 632  *      @info: frame buffer structure that represents a single frame buffer
 633  *
 634  *      Using the fb_var_screeninfo in fb_info we set the resolution
 635  *      of the this particular framebuffer. This function alters the
 636  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
 637  *      not alter var in fb_info since we are using that data. This
 638  *      means we depend on the data in var inside fb_info to be
 639  *      supported by the hardware.  atmel_lcdfb_check_var is always called
 640  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
 641  *      change the resolution you don't need this function.
 642  *
 643  */
 644 static int atmel_lcdfb_set_par(struct fb_info *info)
 645 {
 646         struct atmel_lcdfb_info *sinfo = info->par;
 647         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 648         unsigned long hozval_linesz;
 649         unsigned long value;
 650         unsigned long clk_value_khz;
 651         unsigned long bits_per_line;
 652         unsigned long pix_factor = 2;
 653
 654         might_sleep();
 655
 656         dev_dbg(info->device, "%s:\n", __func__);
 657         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
 658                  info->var.xres, info->var.yres,
 659                  info->var.xres_virtual, info->var.yres_virtual);
 660
 661         atmel_lcdfb_stop_nowait(sinfo);
 662
 663         if (info->var.bits_per_pixel == 1)
 664                 info->fix.visual = FB_VISUAL_MONO01;
 665         else if (info->var.bits_per_pixel <= 8)
 666                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 667         else
 668                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 669
 670         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
 671         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
 672
 673         /* Re-initialize the DMA engine... */
 674         dev_dbg(info->device, "  * update DMA engine\n");
 675         atmel_lcdfb_update_dma(info, &info->var);
 676
 677         /* ...set frame size and burst length = 8 words (?) */
 678         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
 679         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 680         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
 681
 682         /* Now, the LCDC core... */
 683
 684         /* Set pixel clock */
 685         if (sinfo->config->have_alt_pixclock)
 686                 pix_factor = 1;
 687
 688         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 689
 690         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
 691
 692         if (value < pix_factor) {
 693                 dev_notice(info->device, "Bypassing pixel clock divider\n");
 694                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 695         } else {
 696                 value = (value / pix_factor) - 1;
 697                 dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
 698                                 value);
 699                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
 700                                 value << ATMEL_LCDC_CLKVAL_OFFSET);
 701                 info->var.pixclock =
 702                         KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1)));
 703                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
 704                                         PICOS2KHZ(info->var.pixclock));
 705         }
 706
 707
 708         /* Initialize control register 2 */
 709         value = pdata->default_lcdcon2;
 710
 711         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
 712                 value |= ATMEL_LCDC_INVLINE_INVERTED;
 713         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
 714                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
 715
 716         switch (info->var.bits_per_pixel) {
 717                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
 718                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
 719                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
 720                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
 721                 case 15: /* fall through */
 722                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
 723                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
 724                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
 725                 default: BUG(); break;
 726         }
 727         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
 728         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
 729
 730         /* Vertical timing */
 731         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 732         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
 733         value |= info->var.lower_margin;
 734         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
 735         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
 736
 737         /* Horizontal timing */
 738         value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 739         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 740         value |= (info->var.left_margin - 1);
 741         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
 742         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
 743
 744         /* Horizontal value (aka line size) */
 745         hozval_linesz = compute_hozval(sinfo, info->var.xres);
 746
 747         /* Display size */
 748         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 749         value |= info->var.yres - 1;
 750         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
 751         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
 752
 753         /* FIFO Threshold: Use formula from data sheet */
 754         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 755         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
 756
 757         /* Toggle LCD_MODE every frame */
 758         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
 759
 760         /* Disable all interrupts */
 761         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
 762         /* Enable FIFO & DMA errors */
 763         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
 764
 765         /* ...wait for DMA engine to become idle... */
 766         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 767                 msleep(10);
 768
 769         atmel_lcdfb_start(sinfo);
 770
 771         dev_dbg(info->device, "  * DONE\n");
 772
 773         return 0;
 774 }
 775
 776 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
 777 {
 778         chan &= 0xffff;
 779         chan >>= 16 - bf->length;
 780         return chan << bf->offset;
 781 }
 782
 783 /**
 784  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
 785  *      @regno: Which register in the CLUT we are programming
 786  *      @red: The red value which can be up to 16 bits wide
 787  *      @green: The green value which can be up to 16 bits wide
 788  *      @blue:  The blue value which can be up to 16 bits wide.
 789  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 790  *      @info: frame buffer info structure
 791  *
 792  *      Set a single color register. The values supplied have a 16 bit
 793  *      magnitude which needs to be scaled in this function for the hardware.
 794  *      Things to take into consideration are how many color registers, if
 795  *      any, are supported with the current color visual. With truecolor mode
 796  *      no color palettes are supported. Here a pseudo palette is created
 797  *      which we store the value in pseudo_palette in struct fb_info. For
 798  *      pseudocolor mode we have a limited color palette. To deal with this
 799  *      we can program what color is displayed for a particular pixel value.
 800  *      DirectColor is similar in that we can program each color field. If
 801  *      we have a static colormap we don't need to implement this function.
 802  *
 803  *      Returns negative errno on error, or zero on success. In an
 804  *      ideal world, this would have been the case, but as it turns
 805  *      out, the other drivers return 1 on failure, so that's what
 806  *      we're going to do.
 807  */
 808 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
 809                              unsigned int green, unsigned int blue,
 810                              unsigned int transp, struct fb_info *info)
 811 {
 812         struct atmel_lcdfb_info *sinfo = info->par;
 813         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 814         unsigned int val;
 815         u32 *pal;
 816         int ret = 1;
 817
 818         if (info->var.grayscale)
 819                 red = green = blue = (19595 * red + 38470 * green
 820                                       + 7471 * blue) >> 16;
 821
 822         switch (info->fix.visual) {
 823         case FB_VISUAL_TRUECOLOR:
 824                 if (regno < 16) {
 825                         pal = info->pseudo_palette;
 826
 827                         val  = chan_to_field(red, &info->var.red);
 828                         val |= chan_to_field(green, &info->var.green);
 829                         val |= chan_to_field(blue, &info->var.blue);
 830
 831                         pal[regno] = val;
 832                         ret = 0;
 833                 }
 834                 break;
 835
 836         case FB_VISUAL_PSEUDOCOLOR:
 837                 if (regno < 256) {
 838                         if (sinfo->config->have_intensity_bit) {
 839                                 /* old style I+BGR:555 */
 840                                 val  = ((red   >> 11) & 0x001f);
 841                                 val |= ((green >>  6) & 0x03e0);
 842                                 val |= ((blue  >>  1) & 0x7c00);
 843
 844                                 /*
 845                                  * TODO: intensity bit. Maybe something like
 846                                  *   ~(red[10] ^ green[10] ^ blue[10]) & 1
 847                                  */
 848                         } else {
 849                                 /* new style BGR:565 / RGB:565 */
 850                                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 851                                         val  = ((blue >> 11) & 0x001f);
 852                                         val |= ((red  >>  0) & 0xf800);
 853                                 } else {
 854                                         val  = ((red  >> 11) & 0x001f);
 855                                         val |= ((blue >>  0) & 0xf800);
 856                                 }
 857
 858                                 val |= ((green >>  5) & 0x07e0);
 859                         }
 860
 861                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 862                         ret = 0;
 863                 }
 864                 break;
 865
 866         case FB_VISUAL_MONO01:
 867                 if (regno < 2) {
 868                         val = (regno == 0) ? 0x00 : 0x1F;
 869                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 870                         ret = 0;
 871                 }
 872                 break;
 873
 874         }
 875
 876         return ret;
 877 }
 878
 879 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
 880                                struct fb_info *info)
 881 {
 882         dev_dbg(info->device, "%s\n", __func__);
 883
 884         atmel_lcdfb_update_dma(info, var);
 885
 886         return 0;
 887 }
 888
 889 static int atmel_lcdfb_blank(int blank_mode, struct fb_info *info)
 890 {
 891         struct atmel_lcdfb_info *sinfo = info->par;
 892
 893         switch (blank_mode) {
 894         case FB_BLANK_UNBLANK:
 895         case FB_BLANK_NORMAL:
 896                 atmel_lcdfb_start(sinfo);
 897                 break;
 898         case FB_BLANK_VSYNC_SUSPEND:
 899         case FB_BLANK_HSYNC_SUSPEND:
 900                 break;
 901         case FB_BLANK_POWERDOWN:
 902                 atmel_lcdfb_stop(sinfo);
 903                 break;
 904         default:
 905                 return -EINVAL;
 906         }
 907
 908         /* let fbcon do a soft blank for us */
 909         return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
 910 }
 911
 912 static struct fb_ops atmel_lcdfb_ops = {
 913         .owner          = THIS_MODULE,
 914         .fb_check_var   = atmel_lcdfb_check_var,
 915         .fb_set_par     = atmel_lcdfb_set_par,
 916         .fb_setcolreg   = atmel_lcdfb_setcolreg,
 917         .fb_blank       = atmel_lcdfb_blank,
 918         .fb_pan_display = atmel_lcdfb_pan_display,
 919         .fb_fillrect    = cfb_fillrect,
 920         .fb_copyarea    = cfb_copyarea,
 921         .fb_imageblit   = cfb_imageblit,
 922 };
 923
 924 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
 925 {
 926         struct fb_info *info = dev_id;
 927         struct atmel_lcdfb_info *sinfo = info->par;
 928         u32 status;
 929
 930         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
 931         if (status & ATMEL_LCDC_UFLWI) {
 932                 dev_warn(info->device, "FIFO underflow %#x\n", status);
 933                 /* reset DMA and FIFO to avoid screen shifting */
 934                 schedule_work(&sinfo->task);
 935         }
 936         lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
 937         return IRQ_HANDLED;
 938 }
 939
 940 /*
 941  * LCD controller task (to reset the LCD)
 942  */
 943 static void atmel_lcdfb_task(struct work_struct *work)
 944 {
 945         struct atmel_lcdfb_info *sinfo =
 946                 container_of(work, struct atmel_lcdfb_info, task);
 947
 948         atmel_lcdfb_reset(sinfo);
 949 }
 950
 951 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
 952 {
 953         struct fb_info *info = sinfo->info;
 954         int ret = 0;
 955
 956         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
 957
 958         dev_info(info->device,
 959                "%luKiB frame buffer at %08lx (mapped at %p)\n",
 960                (unsigned long)info->fix.smem_len / 1024,
 961                (unsigned long)info->fix.smem_start,
 962                info->screen_base);
 963
 964         /* Allocate colormap */
 965         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 966         if (ret < 0)
 967                 dev_err(info->device, "Alloc color map failed\n");
 968
 969         return ret;
 970 }
 971
 972 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
 973 {
 974         clk_prepare_enable(sinfo->bus_clk);
 975         clk_prepare_enable(sinfo->lcdc_clk);
 976 }
 977
 978 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
 979 {
 980         clk_disable_unprepare(sinfo->bus_clk);
 981         clk_disable_unprepare(sinfo->lcdc_clk);
 982 }
 983
 984 #ifdef CONFIG_OF
 985 static const struct of_device_id atmel_lcdfb_dt_ids[] = {
 986         { .compatible = "atmel,at91sam9261-lcdc" , .data = &at91sam9261_config, },
 987         { .compatible = "atmel,at91sam9263-lcdc" , .data = &at91sam9263_config, },
 988         { .compatible = "atmel,at91sam9g10-lcdc" , .data = &at91sam9g10_config, },
 989         { .compatible = "atmel,at91sam9g45-lcdc" , .data = &at91sam9g45_config, },
 990         { .compatible = "atmel,at91sam9g45es-lcdc" , .data = &at91sam9g45es_config, },
 991         { .compatible = "atmel,at91sam9rl-lcdc" , .data = &at91sam9rl_config, },
 992         { .compatible = "atmel,at32ap-lcdc" , .data = &at32ap_config, },
 993         { /* sentinel */ }
 994 };
 995
 996 MODULE_DEVICE_TABLE(of, atmel_lcdfb_dt_ids);
 997
 998 static const char *atmel_lcdfb_wiring_modes[] = {
 999         [ATMEL_LCDC_WIRING_BGR] = "BRG",
1000         [ATMEL_LCDC_WIRING_RGB] = "RGB",
1001 };
1002
1003 const int atmel_lcdfb_get_of_wiring_modes(struct device_node *np)
1004 {
1005         const char *mode;
1006         int err, i;
1007
1008         err = of_property_read_string(np, "atmel,lcd-wiring-mode", &mode);
1009         if (err < 0)
1010                 return ATMEL_LCDC_WIRING_BGR;
1011
1012         for (i = 0; i < ARRAY_SIZE(atmel_lcdfb_wiring_modes); i++)
1013                 if (!strcasecmp(mode, atmel_lcdfb_wiring_modes[i]))
1014                         return i;
1015
1016         return -ENODEV;
1017 }
1018
1019 static void atmel_lcdfb_power_control_gpio(struct atmel_lcdfb_pdata *pdata, int on)
1020 {
1021         struct atmel_lcdfb_power_ctrl_gpio *og;
1022
1023         list_for_each_entry(og, &pdata->pwr_gpios, list)
1024                 gpio_set_value(og->gpio, on);
1025 }
1026
1027 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
1028 {
1029         struct fb_info *info = sinfo->info;
1030         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
1031         struct fb_var_screeninfo *var = &info->var;
1032         struct device *dev = &sinfo->pdev->dev;
1033         struct device_node *np =dev->of_node;
1034         struct device_node *display_np;
1035         struct device_node *timings_np;
1036         struct display_timings *timings;
1037         enum of_gpio_flags flags;
1038         struct atmel_lcdfb_power_ctrl_gpio *og;
1039         bool is_gpio_power = false;
1040         int ret = -ENOENT;
1041         int i, gpio;
1042
1043         sinfo->config = (struct atmel_lcdfb_config*)
1044                 of_match_device(atmel_lcdfb_dt_ids, dev)->data;
1045
1046         display_np = of_parse_phandle(np, "display", 0);
1047         if (!display_np) {
1048                 dev_err(dev, "failed to find display phandle\n");
1049                 return -ENOENT;
1050         }
1051
1052         ret = of_property_read_u32(display_np, "bits-per-pixel", &var->bits_per_pixel);
1053         if (ret < 0) {
1054                 dev_err(dev, "failed to get property bits-per-pixel\n");
1055                 goto put_display_node;
1056         }
1057
1058         ret = of_property_read_u32(display_np, "atmel,guard-time", &pdata->guard_time);
1059         if (ret < 0) {
1060                 dev_err(dev, "failed to get property atmel,guard-time\n");
1061                 goto put_display_node;
1062         }
1063
1064         ret = of_property_read_u32(display_np, "atmel,lcdcon2", &pdata->default_lcdcon2);
1065         if (ret < 0) {
1066                 dev_err(dev, "failed to get property atmel,lcdcon2\n");
1067                 goto put_display_node;
1068         }
1069
1070         ret = of_property_read_u32(display_np, "atmel,dmacon", &pdata->default_dmacon);
1071         if (ret < 0) {
1072                 dev_err(dev, "failed to get property bits-per-pixel\n");
1073                 goto put_display_node;
1074         }
1075
1076         INIT_LIST_HEAD(&pdata->pwr_gpios);
1077         ret = -ENOMEM;
1078         for (i = 0; i < of_gpio_named_count(display_np, "atmel,power-control-gpio"); i++) {
1079                 gpio = of_get_named_gpio_flags(display_np, "atmel,power-control-gpio",
1080                                                i, &flags);
1081                 if (gpio < 0)
1082                         continue;
1083
1084                 og = devm_kzalloc(dev, sizeof(*og), GFP_KERNEL);
1085                 if (!og)
1086                         goto put_display_node;
1087
1088                 og->gpio = gpio;
1089                 og->active_low = flags & OF_GPIO_ACTIVE_LOW;
1090                 is_gpio_power = true;
1091                 ret = devm_gpio_request(dev, gpio, "lcd-power-control-gpio");
1092                 if (ret) {
1093                         dev_err(dev, "request gpio %d failed\n", gpio);
1094                         goto put_display_node;
1095                 }
1096
1097                 ret = gpio_direction_output(gpio, og->active_low);
1098                 if (ret) {
1099                         dev_err(dev, "set direction output gpio %d failed\n", gpio);
1100                         goto put_display_node;
1101                 }
1102                 list_add(&og->list, &pdata->pwr_gpios);
1103         }
1104
1105         if (is_gpio_power)
1106                 pdata->atmel_lcdfb_power_control = atmel_lcdfb_power_control_gpio;
1107
1108         ret = atmel_lcdfb_get_of_wiring_modes(display_np);
1109         if (ret < 0) {
1110                 dev_err(dev, "invalid atmel,lcd-wiring-mode\n");
1111                 goto put_display_node;
1112         }
1113         pdata->lcd_wiring_mode = ret;
1114
1115         pdata->lcdcon_is_backlight = of_property_read_bool(display_np, "atmel,lcdcon-backlight");
1116         pdata->lcdcon_pol_negative = of_property_read_bool(display_np, "atmel,lcdcon-backlight-inverted");
1117
1118         timings = of_get_display_timings(display_np);
1119         if (!timings) {
1120                 dev_err(dev, "failed to get display timings\n");
1121                 ret = -EINVAL;
1122                 goto put_display_node;
1123         }
1124
1125         timings_np = of_find_node_by_name(display_np, "display-timings");
1126         if (!timings_np) {
1127                 dev_err(dev, "failed to find display-timings node\n");
1128                 ret = -ENODEV;
1129                 goto put_display_node;
1130         }
1131
1132         for (i = 0; i < of_get_child_count(timings_np); i++) {
1133                 struct videomode vm;
1134                 struct fb_videomode fb_vm;
1135
1136                 ret = videomode_from_timings(timings, &vm, i);
1137                 if (ret < 0)
1138                         goto put_timings_node;
1139                 ret = fb_videomode_from_videomode(&vm, &fb_vm);
1140                 if (ret < 0)
1141                         goto put_timings_node;
1142
1143                 fb_add_videomode(&fb_vm, &info->modelist);
1144         }
1145
1146         return 0;
1147
1148 put_timings_node:
1149         of_node_put(timings_np);
1150 put_display_node:
1151         of_node_put(display_np);
1152         return ret;
1153 }
1154 #else
1155 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
1156 {
1157         return 0;
1158 }
1159 #endif
1160
1161 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
1162 {
1163         struct device *dev = &pdev->dev;
1164         struct fb_info *info;
1165         struct atmel_lcdfb_info *sinfo;
1166         struct atmel_lcdfb_pdata *pdata = NULL;
1167         struct resource *regs = NULL;
1168         struct resource *map = NULL;
1169         struct fb_modelist *modelist;
1170         int ret;
1171
1172         dev_dbg(dev, "%s BEGIN\n", __func__);
1173
1174         ret = -ENOMEM;
1175         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
1176         if (!info) {
1177                 dev_err(dev, "cannot allocate memory\n");
1178                 goto out;
1179         }
1180
1181         sinfo = info->par;
1182         sinfo->pdev = pdev;
1183         sinfo->info = info;
1184
1185         INIT_LIST_HEAD(&info->modelist);
1186
1187         if (pdev->dev.of_node) {
1188                 ret = atmel_lcdfb_of_init(sinfo);
1189                 if (ret)
1190                         goto free_info;
1191         } else if (dev_get_platdata(dev)) {
1192                 struct fb_monspecs *monspecs;
1193                 int i;
1194
1195                 pdata = dev_get_platdata(dev);
1196                 monspecs = pdata->default_monspecs;
1197                 sinfo->pdata = *pdata;
1198
1199                 for (i = 0; i < monspecs->modedb_len; i++)
1200                         fb_add_videomode(&monspecs->modedb[i], &info->modelist);
1201
1202                 sinfo->config = atmel_lcdfb_get_config(pdev);
1203
1204                 info->var.bits_per_pixel = pdata->default_bpp ? pdata->default_bpp : 16;
1205                 memcpy(&info->monspecs, pdata->default_monspecs, sizeof(info->monspecs));
1206         } else {
1207                 dev_err(dev, "cannot get default configuration\n");
1208                 goto free_info;
1209         }
1210
1211         if (!sinfo->config)
1212                 goto free_info;
1213
1214         sinfo->reg_lcd = devm_regulator_get(&pdev->dev, "lcd");
1215         if (IS_ERR(sinfo->reg_lcd))
1216                 sinfo->reg_lcd = NULL;
1217
1218         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
1219         info->pseudo_palette = sinfo->pseudo_palette;
1220         info->fbops = &atmel_lcdfb_ops;
1221
1222         info->fix = atmel_lcdfb_fix;
1223         strcpy(info->fix.id, sinfo->pdev->name);
1224
1225         /* Enable LCDC Clocks */
1226         sinfo->bus_clk = clk_get(dev, "hclk");
1227         if (IS_ERR(sinfo->bus_clk)) {
1228                 ret = PTR_ERR(sinfo->bus_clk);
1229                 goto free_info;
1230         }
1231         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
1232         if (IS_ERR(sinfo->lcdc_clk)) {
1233                 ret = PTR_ERR(sinfo->lcdc_clk);
1234                 goto put_bus_clk;
1235         }
1236         atmel_lcdfb_start_clock(sinfo);
1237
1238         modelist = list_first_entry(&info->modelist,
1239                         struct fb_modelist, list);
1240         fb_videomode_to_var(&info->var, &modelist->mode);
1241
1242         atmel_lcdfb_check_var(&info->var, info);
1243
1244         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1245         if (!regs) {
1246                 dev_err(dev, "resources unusable\n");
1247                 ret = -ENXIO;
1248                 goto stop_clk;
1249         }
1250
1251         sinfo->irq_base = platform_get_irq(pdev, 0);
1252         if (sinfo->irq_base < 0) {
1253                 dev_err(dev, "unable to get irq\n");
1254                 ret = sinfo->irq_base;
1255                 goto stop_clk;
1256         }
1257
1258         /* Initialize video memory */
1259         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1260         if (map) {
1261                 /* use a pre-allocated memory buffer */
1262                 info->fix.smem_start = map->start;
1263                 info->fix.smem_len = resource_size(map);
1264                 if (!request_mem_region(info->fix.smem_start,
1265                                         info->fix.smem_len, pdev->name)) {
1266                         ret = -EBUSY;
1267                         goto stop_clk;
1268                 }
1269
1270                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1271                 if (!info->screen_base) {
1272                         ret = -ENOMEM;
1273                         goto release_intmem;
1274                 }
1275
1276                 /*
1277                  * Don't clear the framebuffer -- someone may have set
1278                  * up a splash image.
1279                  */
1280         } else {
1281                 /* allocate memory buffer */
1282                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
1283                 if (ret < 0) {
1284                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
1285                         goto stop_clk;
1286                 }
1287         }
1288
1289         /* LCDC registers */
1290         info->fix.mmio_start = regs->start;
1291         info->fix.mmio_len = resource_size(regs);
1292
1293         if (!request_mem_region(info->fix.mmio_start,
1294                                 info->fix.mmio_len, pdev->name)) {
1295                 ret = -EBUSY;
1296                 goto free_fb;
1297         }
1298
1299         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
1300         if (!sinfo->mmio) {
1301                 dev_err(dev, "cannot map LCDC registers\n");
1302                 ret = -ENOMEM;
1303                 goto release_mem;
1304         }
1305
1306         /* Initialize PWM for contrast or backlight ("off") */
1307         init_contrast(sinfo);
1308
1309         /* interrupt */
1310         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
1311         if (ret) {
1312                 dev_err(dev, "request_irq failed: %d\n", ret);
1313                 goto unmap_mmio;
1314         }
1315
1316         /* Some operations on the LCDC might sleep and
1317          * require a preemptible task context */
1318         INIT_WORK(&sinfo->task, atmel_lcdfb_task);
1319
1320         ret = atmel_lcdfb_init_fbinfo(sinfo);
1321         if (ret < 0) {
1322                 dev_err(dev, "init fbinfo failed: %d\n", ret);
1323                 goto unregister_irqs;
1324         }
1325
1326         ret = atmel_lcdfb_set_par(info);
1327         if (ret < 0) {
1328                 dev_err(dev, "set par failed: %d\n", ret);
1329                 goto unregister_irqs;
1330         }
1331
1332         dev_set_drvdata(dev, info);
1333
1334         /*
1335          * Tell the world that we're ready to go
1336          */
1337         ret = register_framebuffer(info);
1338         if (ret < 0) {
1339                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
1340                 goto reset_drvdata;
1341         }
1342
1343         /* Power up the LCDC screen */
1344         atmel_lcdfb_power_control(sinfo, 1);
1345
1346         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1347                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
1348
1349         return 0;
1350
1351 reset_drvdata:
1352         dev_set_drvdata(dev, NULL);
1353         fb_dealloc_cmap(&info->cmap);
1354 unregister_irqs:
1355         cancel_work_sync(&sinfo->task);
1356         free_irq(sinfo->irq_base, info);
1357 unmap_mmio:
1358         exit_backlight(sinfo);
1359         iounmap(sinfo->mmio);
1360 release_mem:
1361         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1362 free_fb:
1363         if (map)
1364                 iounmap(info->screen_base);
1365         else
1366                 atmel_lcdfb_free_video_memory(sinfo);
1367
1368 release_intmem:
1369         if (map)
1370                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1371 stop_clk:
1372         atmel_lcdfb_stop_clock(sinfo);
1373         clk_put(sinfo->lcdc_clk);
1374 put_bus_clk:
1375         clk_put(sinfo->bus_clk);
1376 free_info:
1377         framebuffer_release(info);
1378 out:
1379         dev_dbg(dev, "%s FAILED\n", __func__);
1380         return ret;
1381 }
1382
1383 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1384 {
1385         struct device *dev = &pdev->dev;
1386         struct fb_info *info = dev_get_drvdata(dev);
1387         struct atmel_lcdfb_info *sinfo;
1388         struct atmel_lcdfb_pdata *pdata;
1389
1390         if (!info || !info->par)
1391                 return 0;
1392         sinfo = info->par;
1393         pdata = &sinfo->pdata;
1394
1395         cancel_work_sync(&sinfo->task);
1396         exit_backlight(sinfo);
1397         atmel_lcdfb_power_control(sinfo, 0);
1398         unregister_framebuffer(info);
1399         atmel_lcdfb_stop_clock(sinfo);
1400         clk_put(sinfo->lcdc_clk);
1401         clk_put(sinfo->bus_clk);
1402         fb_dealloc_cmap(&info->cmap);
1403         free_irq(sinfo->irq_base, info);
1404         iounmap(sinfo->mmio);
1405         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1406         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1407                 iounmap(info->screen_base);
1408                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1409         } else {
1410                 atmel_lcdfb_free_video_memory(sinfo);
1411         }
1412
1413         framebuffer_release(info);
1414
1415         return 0;
1416 }
1417
1418 #ifdef CONFIG_PM
1419
1420 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1421 {
1422         struct fb_info *info = platform_get_drvdata(pdev);
1423         struct atmel_lcdfb_info *sinfo = info->par;
1424
1425         /*
1426          * We don't want to handle interrupts while the clock is
1427          * stopped. It may take forever.
1428          */
1429         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1430
1431         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_CTR);
1432         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1433         atmel_lcdfb_power_control(sinfo, 0);
1434         atmel_lcdfb_stop(sinfo);
1435         atmel_lcdfb_stop_clock(sinfo);
1436
1437         return 0;
1438 }
1439
1440 static int atmel_lcdfb_resume(struct platform_device *pdev)
1441 {
1442         struct fb_info *info = platform_get_drvdata(pdev);
1443         struct atmel_lcdfb_info *sinfo = info->par;
1444
1445         atmel_lcdfb_start_clock(sinfo);
1446         atmel_lcdfb_start(sinfo);
1447         atmel_lcdfb_power_control(sinfo, 1);
1448         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1449
1450         /* Enable FIFO & DMA errors */
1451         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1452                         | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1453
1454         return 0;
1455 }
1456
1457 #else
1458 #define atmel_lcdfb_suspend     NULL
1459 #define atmel_lcdfb_resume      NULL
1460 #endif
1461
1462 static struct platform_driver atmel_lcdfb_driver = {
1463         .remove         = __exit_p(atmel_lcdfb_remove),
1464         .suspend        = atmel_lcdfb_suspend,
1465         .resume         = atmel_lcdfb_resume,
1466         .id_table       = atmel_lcdfb_devtypes,
1467         .driver         = {
1468                 .name   = "atmel_lcdfb",
1469                 .owner  = THIS_MODULE,
1470                 .of_match_table = of_match_ptr(atmel_lcdfb_dt_ids),
1471         },
1472 };
1473
1474 module_platform_driver_probe(atmel_lcdfb_driver, atmel_lcdfb_probe);
1475
1476 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1477 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1478 MODULE_LICENSE("GPL");