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