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
  22 #include <mach/board.h>
  23 #include <mach/cpu.h>
  24 #include <mach/gpio.h>
  25
  26 #include <video/atmel_lcdc.h>
  27
  28 #define lcdc_readl(sinfo, reg)          __raw_readl((sinfo)->mmio+(reg))
  29 #define lcdc_writel(sinfo, reg, val)    __raw_writel((val), (sinfo)->mmio+(reg))
  30
  31 /* configurable parameters */
  32 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
  33 #define ATMEL_LCDC_DMA_BURST_LEN        8       /* words */
  34 #define ATMEL_LCDC_FIFO_SIZE            512     /* words */
  35
  36 #if defined(CONFIG_ARCH_AT91)
  37 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
  38                                          | FBINFO_PARTIAL_PAN_OK \
  39                                          | FBINFO_HWACCEL_YPAN)
  40
  41 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
  42                                         struct fb_var_screeninfo *var)
  43 {
  44
  45 }
  46 #elif defined(CONFIG_AVR32)
  47 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
  48                                         | FBINFO_PARTIAL_PAN_OK \
  49                                         | FBINFO_HWACCEL_XPAN \
  50                                         | FBINFO_HWACCEL_YPAN)
  51
  52 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
  53                                      struct fb_var_screeninfo *var)
  54 {
  55         u32 dma2dcfg;
  56         u32 pixeloff;
  57
  58         pixeloff = (var->xoffset * var->bits_per_pixel) & 0x1f;
  59
  60         dma2dcfg = ((var->xres_virtual - var->xres) * var->bits_per_pixel) / 8;
  61         dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
  62         lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
  63
  64         /* Update configuration */
  65         lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
  66                     lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
  67                     | ATMEL_LCDC_DMAUPDT);
  68 }
  69 #endif
  70
  71 static const u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
  72                 | ATMEL_LCDC_POL_POSITIVE
  73                 | ATMEL_LCDC_ENA_PWMENABLE;
  74
  75 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
  76
  77 /* some bl->props field just changed */
  78 static int atmel_bl_update_status(struct backlight_device *bl)
  79 {
  80         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
  81         int                     power = sinfo->bl_power;
  82         int                     brightness = bl->props.brightness;
  83
  84         /* REVISIT there may be a meaningful difference between
  85          * fb_blank and power ... there seem to be some cases
  86          * this doesn't handle correctly.
  87          */
  88         if (bl->props.fb_blank != sinfo->bl_power)
  89                 power = bl->props.fb_blank;
  90         else if (bl->props.power != sinfo->bl_power)
  91                 power = bl->props.power;
  92
  93         if (brightness < 0 && power == FB_BLANK_UNBLANK)
  94                 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
  95         else if (power != FB_BLANK_UNBLANK)
  96                 brightness = 0;
  97
  98         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
  99         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
 100                         brightness ? contrast_ctr : 0);
 101
 102         bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
 103
 104         return 0;
 105 }
 106
 107 static int atmel_bl_get_brightness(struct backlight_device *bl)
 108 {
 109         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 110
 111         return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 112 }
 113
 114 static const struct backlight_ops atmel_lcdc_bl_ops = {
 115         .update_status = atmel_bl_update_status,
 116         .get_brightness = atmel_bl_get_brightness,
 117 };
 118
 119 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 120 {
 121         struct backlight_properties props;
 122         struct backlight_device *bl;
 123
 124         sinfo->bl_power = FB_BLANK_UNBLANK;
 125
 126         if (sinfo->backlight)
 127                 return;
 128
 129         memset(&props, 0, sizeof(struct backlight_properties));
 130         props.type = BACKLIGHT_RAW;
 131         props.max_brightness = 0xff;
 132         bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo,
 133                                        &atmel_lcdc_bl_ops, &props);
 134         if (IS_ERR(bl)) {
 135                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
 136                                 PTR_ERR(bl));
 137                 return;
 138         }
 139         sinfo->backlight = bl;
 140
 141         bl->props.power = FB_BLANK_UNBLANK;
 142         bl->props.fb_blank = FB_BLANK_UNBLANK;
 143         bl->props.brightness = atmel_bl_get_brightness(bl);
 144 }
 145
 146 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 147 {
 148         if (sinfo->backlight)
 149                 backlight_device_unregister(sinfo->backlight);
 150 }
 151
 152 #else
 153
 154 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 155 {
 156         dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
 157 }
 158
 159 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 160 {
 161 }
 162
 163 #endif
 164
 165 static void init_contrast(struct atmel_lcdfb_info *sinfo)
 166 {
 167         /* have some default contrast/backlight settings */
 168         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 169         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 170
 171         if (sinfo->lcdcon_is_backlight)
 172                 init_backlight(sinfo);
 173 }
 174
 175
 176 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
 177         .type           = FB_TYPE_PACKED_PIXELS,
 178         .visual         = FB_VISUAL_TRUECOLOR,
 179         .xpanstep       = 0,
 180         .ypanstep       = 1,
 181         .ywrapstep      = 0,
 182         .accel          = FB_ACCEL_NONE,
 183 };
 184
 185 static unsigned long compute_hozval(unsigned long xres, unsigned long lcdcon2)
 186 {
 187         unsigned long value;
 188
 189         if (!(cpu_is_at91sam9261() || cpu_is_at91sam9g10()
 190                 || cpu_is_at32ap7000()))
 191                 return xres;
 192
 193         value = xres;
 194         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
 195                 /* STN display */
 196                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
 197                         value *= 3;
 198                 }
 199                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
 200                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
 201                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
 202                         value = DIV_ROUND_UP(value, 4);
 203                 else
 204                         value = DIV_ROUND_UP(value, 8);
 205         }
 206
 207         return value;
 208 }
 209
 210 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
 211 {
 212         /* Turn off the LCD controller and the DMA controller */
 213         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 214                         sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
 215
 216         /* Wait for the LCDC core to become idle */
 217         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 218                 msleep(10);
 219
 220         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
 221 }
 222
 223 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
 224 {
 225         atmel_lcdfb_stop_nowait(sinfo);
 226
 227         /* Wait for DMA engine to become idle... */
 228         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 229                 msleep(10);
 230 }
 231
 232 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
 233 {
 234         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon);
 235         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 236                 (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
 237                 | ATMEL_LCDC_PWR);
 238 }
 239
 240 static void atmel_lcdfb_update_dma(struct fb_info *info,
 241                                struct fb_var_screeninfo *var)
 242 {
 243         struct atmel_lcdfb_info *sinfo = info->par;
 244         struct fb_fix_screeninfo *fix = &info->fix;
 245         unsigned long dma_addr;
 246
 247         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
 248                     + var->xoffset * var->bits_per_pixel / 8);
 249
 250         dma_addr &= ~3UL;
 251
 252         /* Set framebuffer DMA base address and pixel offset */
 253         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
 254
 255         atmel_lcdfb_update_dma2d(sinfo, var);
 256 }
 257
 258 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
 259 {
 260         struct fb_info *info = sinfo->info;
 261
 262         dma_free_writecombine(info->device, info->fix.smem_len,
 263                                 info->screen_base, info->fix.smem_start);
 264 }
 265
 266 /**
 267  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
 268  *      @sinfo: the frame buffer to allocate memory for
 269  *
 270  *      This function is called only from the atmel_lcdfb_probe()
 271  *      so no locking by fb_info->mm_lock around smem_len setting is needed.
 272  */
 273 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
 274 {
 275         struct fb_info *info = sinfo->info;
 276         struct fb_var_screeninfo *var = &info->var;
 277         unsigned int smem_len;
 278
 279         smem_len = (var->xres_virtual * var->yres_virtual
 280                     * ((var->bits_per_pixel + 7) / 8));
 281         info->fix.smem_len = max(smem_len, sinfo->smem_len);
 282
 283         info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
 284                                         (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
 285
 286         if (!info->screen_base) {
 287                 return -ENOMEM;
 288         }
 289
 290         memset(info->screen_base, 0, info->fix.smem_len);
 291
 292         return 0;
 293 }
 294
 295 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
 296                                                      struct fb_info *info)
 297 {
 298         struct fb_videomode varfbmode;
 299         const struct fb_videomode *fbmode = NULL;
 300
 301         fb_var_to_videomode(&varfbmode, var);
 302         fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
 303         if (fbmode)
 304                 fb_videomode_to_var(var, fbmode);
 305         return fbmode;
 306 }
 307
 308
 309 /**
 310  *      atmel_lcdfb_check_var - Validates a var passed in.
 311  *      @var: frame buffer variable screen structure
 312  *      @info: frame buffer structure that represents a single frame buffer
 313  *
 314  *      Checks to see if the hardware supports the state requested by
 315  *      var passed in. This function does not alter the hardware
 316  *      state!!!  This means the data stored in struct fb_info and
 317  *      struct atmel_lcdfb_info do not change. This includes the var
 318  *      inside of struct fb_info.  Do NOT change these. This function
 319  *      can be called on its own if we intent to only test a mode and
 320  *      not actually set it. The stuff in modedb.c is a example of
 321  *      this. If the var passed in is slightly off by what the
 322  *      hardware can support then we alter the var PASSED in to what
 323  *      we can do. If the hardware doesn't support mode change a
 324  *      -EINVAL will be returned by the upper layers. You don't need
 325  *      to implement this function then. If you hardware doesn't
 326  *      support changing the resolution then this function is not
 327  *      needed. In this case the driver would just provide a var that
 328  *      represents the static state the screen is in.
 329  *
 330  *      Returns negative errno on error, or zero on success.
 331  */
 332 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
 333                              struct fb_info *info)
 334 {
 335         struct device *dev = info->device;
 336         struct atmel_lcdfb_info *sinfo = info->par;
 337         unsigned long clk_value_khz;
 338
 339         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 340
 341         dev_dbg(dev, "%s:\n", __func__);
 342
 343         if (!(var->pixclock && var->bits_per_pixel)) {
 344                 /* choose a suitable mode if possible */
 345                 if (!atmel_lcdfb_choose_mode(var, info)) {
 346                         dev_err(dev, "needed value not specified\n");
 347                         return -EINVAL;
 348                 }
 349         }
 350
 351         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
 352         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
 353         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
 354         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
 355
 356         if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
 357                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
 358                 return -EINVAL;
 359         }
 360
 361         /* Do not allow to have real resoulution larger than virtual */
 362         if (var->xres > var->xres_virtual)
 363                 var->xres_virtual = var->xres;
 364
 365         if (var->yres > var->yres_virtual)
 366                 var->yres_virtual = var->yres;
 367
 368         /* Force same alignment for each line */
 369         var->xres = (var->xres + 3) & ~3UL;
 370         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
 371
 372         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
 373         var->transp.msb_right = 0;
 374         var->transp.offset = var->transp.length = 0;
 375         var->xoffset = var->yoffset = 0;
 376
 377         if (info->fix.smem_len) {
 378                 unsigned int smem_len = (var->xres_virtual * var->yres_virtual
 379                                          * ((var->bits_per_pixel + 7) / 8));
 380                 if (smem_len > info->fix.smem_len)
 381                         return -EINVAL;
 382         }
 383
 384         /* Saturate vertical and horizontal timings at maximum values */
 385         var->vsync_len = min_t(u32, var->vsync_len,
 386                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
 387         var->upper_margin = min_t(u32, var->upper_margin,
 388                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
 389         var->lower_margin = min_t(u32, var->lower_margin,
 390                         ATMEL_LCDC_VFP);
 391         var->right_margin = min_t(u32, var->right_margin,
 392                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
 393         var->hsync_len = min_t(u32, var->hsync_len,
 394                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
 395         var->left_margin = min_t(u32, var->left_margin,
 396                         ATMEL_LCDC_HBP + 1);
 397
 398         /* Some parameters can't be zero */
 399         var->vsync_len = max_t(u32, var->vsync_len, 1);
 400         var->right_margin = max_t(u32, var->right_margin, 1);
 401         var->hsync_len = max_t(u32, var->hsync_len, 1);
 402         var->left_margin = max_t(u32, var->left_margin, 1);
 403
 404         switch (var->bits_per_pixel) {
 405         case 1:
 406         case 2:
 407         case 4:
 408         case 8:
 409                 var->red.offset = var->green.offset = var->blue.offset = 0;
 410                 var->red.length = var->green.length = var->blue.length
 411                         = var->bits_per_pixel;
 412                 break;
 413         case 15:
 414         case 16:
 415                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 416                         /* RGB:565 mode */
 417                         var->red.offset = 11;
 418                         var->blue.offset = 0;
 419                         var->green.length = 6;
 420                 } else if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB555) {
 421                         var->red.offset = 10;
 422                         var->blue.offset = 0;
 423                         var->green.length = 5;
 424                 } else {
 425                         /* BGR:555 mode */
 426                         var->red.offset = 0;
 427                         var->blue.offset = 10;
 428                         var->green.length = 5;
 429                 }
 430                 var->green.offset = 5;
 431                 var->red.length = var->blue.length = 5;
 432                 break;
 433         case 32:
 434                 var->transp.offset = 24;
 435                 var->transp.length = 8;
 436                 /* fall through */
 437         case 24:
 438                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 439                         /* RGB:888 mode */
 440                         var->red.offset = 16;
 441                         var->blue.offset = 0;
 442                 } else {
 443                         /* BGR:888 mode */
 444                         var->red.offset = 0;
 445                         var->blue.offset = 16;
 446                 }
 447                 var->green.offset = 8;
 448                 var->red.length = var->green.length = var->blue.length = 8;
 449                 break;
 450         default:
 451                 dev_err(dev, "color depth %d not supported\n",
 452                                         var->bits_per_pixel);
 453                 return -EINVAL;
 454         }
 455
 456         return 0;
 457 }
 458
 459 /*
 460  * LCD reset sequence
 461  */
 462 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
 463 {
 464         might_sleep();
 465
 466         atmel_lcdfb_stop(sinfo);
 467         atmel_lcdfb_start(sinfo);
 468 }
 469
 470 /**
 471  *      atmel_lcdfb_set_par - Alters the hardware state.
 472  *      @info: frame buffer structure that represents a single frame buffer
 473  *
 474  *      Using the fb_var_screeninfo in fb_info we set the resolution
 475  *      of the this particular framebuffer. This function alters the
 476  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
 477  *      not alter var in fb_info since we are using that data. This
 478  *      means we depend on the data in var inside fb_info to be
 479  *      supported by the hardware.  atmel_lcdfb_check_var is always called
 480  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
 481  *      change the resolution you don't need this function.
 482  *
 483  */
 484 static int atmel_lcdfb_set_par(struct fb_info *info)
 485 {
 486         struct atmel_lcdfb_info *sinfo = info->par;
 487         unsigned long hozval_linesz;
 488         unsigned long value;
 489         unsigned long clk_value_khz;
 490         unsigned long bits_per_line;
 491         unsigned long pix_factor = 2;
 492
 493         might_sleep();
 494
 495         dev_dbg(info->device, "%s:\n", __func__);
 496         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
 497                  info->var.xres, info->var.yres,
 498                  info->var.xres_virtual, info->var.yres_virtual);
 499
 500         atmel_lcdfb_stop_nowait(sinfo);
 501
 502         if (info->var.bits_per_pixel == 1)
 503                 info->fix.visual = FB_VISUAL_MONO01;
 504         else if (info->var.bits_per_pixel <= 8)
 505                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 506         else
 507                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 508
 509         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
 510         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
 511
 512         /* Re-initialize the DMA engine... */
 513         dev_dbg(info->device, "  * update DMA engine\n");
 514         atmel_lcdfb_update_dma(info, &info->var);
 515
 516         /* ...set frame size and burst length = 8 words (?) */
 517         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
 518         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 519         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
 520
 521         /* Now, the LCDC core... */
 522
 523         /* Set pixel clock */
 524         if (cpu_is_at91sam9g45() && !cpu_is_at91sam9g45es())
 525                 pix_factor = 1;
 526
 527         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 528
 529         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
 530
 531         if (value < pix_factor) {
 532                 dev_notice(info->device, "Bypassing pixel clock divider\n");
 533                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 534         } else {
 535                 value = (value / pix_factor) - 1;
 536                 dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
 537                                 value);
 538                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
 539                                 value << ATMEL_LCDC_CLKVAL_OFFSET);
 540                 info->var.pixclock =
 541                         KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1)));
 542                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
 543                                         PICOS2KHZ(info->var.pixclock));
 544         }
 545
 546
 547         /* Initialize control register 2 */
 548         value = sinfo->default_lcdcon2;
 549
 550         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
 551                 value |= ATMEL_LCDC_INVLINE_INVERTED;
 552         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
 553                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
 554
 555         switch (info->var.bits_per_pixel) {
 556                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
 557                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
 558                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
 559                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
 560                 case 15: /* fall through */
 561                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
 562                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
 563                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
 564                 default: BUG(); break;
 565         }
 566         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
 567         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
 568
 569         /* Vertical timing */
 570         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 571         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
 572         value |= info->var.lower_margin;
 573         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
 574         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
 575
 576         /* Horizontal timing */
 577         value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 578         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 579         value |= (info->var.left_margin - 1);
 580         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
 581         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
 582
 583         /* Horizontal value (aka line size) */
 584         hozval_linesz = compute_hozval(info->var.xres,
 585                                         lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2));
 586
 587         /* Display size */
 588         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 589         value |= info->var.yres - 1;
 590         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
 591         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
 592
 593         /* FIFO Threshold: Use formula from data sheet */
 594         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 595         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
 596
 597         /* Toggle LCD_MODE every frame */
 598         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
 599
 600         /* Disable all interrupts */
 601         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
 602         /* Enable FIFO & DMA errors */
 603         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
 604
 605         /* ...wait for DMA engine to become idle... */
 606         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 607                 msleep(10);
 608
 609         atmel_lcdfb_start(sinfo);
 610
 611         dev_dbg(info->device, "  * DONE\n");
 612
 613         return 0;
 614 }
 615
 616 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
 617 {
 618         chan &= 0xffff;
 619         chan >>= 16 - bf->length;
 620         return chan << bf->offset;
 621 }
 622
 623 /**
 624  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
 625  *      @regno: Which register in the CLUT we are programming
 626  *      @red: The red value which can be up to 16 bits wide
 627  *      @green: The green value which can be up to 16 bits wide
 628  *      @blue:  The blue value which can be up to 16 bits wide.
 629  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 630  *      @info: frame buffer info structure
 631  *
 632  *      Set a single color register. The values supplied have a 16 bit
 633  *      magnitude which needs to be scaled in this function for the hardware.
 634  *      Things to take into consideration are how many color registers, if
 635  *      any, are supported with the current color visual. With truecolor mode
 636  *      no color palettes are supported. Here a psuedo palette is created
 637  *      which we store the value in pseudo_palette in struct fb_info. For
 638  *      pseudocolor mode we have a limited color palette. To deal with this
 639  *      we can program what color is displayed for a particular pixel value.
 640  *      DirectColor is similar in that we can program each color field. If
 641  *      we have a static colormap we don't need to implement this function.
 642  *
 643  *      Returns negative errno on error, or zero on success. In an
 644  *      ideal world, this would have been the case, but as it turns
 645  *      out, the other drivers return 1 on failure, so that's what
 646  *      we're going to do.
 647  */
 648 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
 649                              unsigned int green, unsigned int blue,
 650                              unsigned int transp, struct fb_info *info)
 651 {
 652         struct atmel_lcdfb_info *sinfo = info->par;
 653         unsigned int val;
 654         u32 *pal;
 655         int ret = 1;
 656
 657         if (info->var.grayscale)
 658                 red = green = blue = (19595 * red + 38470 * green
 659                                       + 7471 * blue) >> 16;
 660
 661         switch (info->fix.visual) {
 662         case FB_VISUAL_TRUECOLOR:
 663                 if (regno < 16) {
 664                         pal = info->pseudo_palette;
 665
 666                         val  = chan_to_field(red, &info->var.red);
 667                         val |= chan_to_field(green, &info->var.green);
 668                         val |= chan_to_field(blue, &info->var.blue);
 669
 670                         pal[regno] = val;
 671                         ret = 0;
 672                 }
 673                 break;
 674
 675         case FB_VISUAL_PSEUDOCOLOR:
 676                 if (regno < 256) {
 677                         val  = ((red   >> 11) & 0x001f);
 678                         val |= ((green >>  6) & 0x03e0);
 679                         val |= ((blue  >>  1) & 0x7c00);
 680
 681                         /*
 682                          * TODO: intensity bit. Maybe something like
 683                          *   ~(red[10] ^ green[10] ^ blue[10]) & 1
 684                          */
 685
 686                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 687                         ret = 0;
 688                 }
 689                 break;
 690
 691         case FB_VISUAL_MONO01:
 692                 if (regno < 2) {
 693                         val = (regno == 0) ? 0x00 : 0x1F;
 694                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 695                         ret = 0;
 696                 }
 697                 break;
 698
 699         }
 700
 701         return ret;
 702 }
 703
 704 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
 705                                struct fb_info *info)
 706 {
 707         dev_dbg(info->device, "%s\n", __func__);
 708
 709         atmel_lcdfb_update_dma(info, var);
 710
 711         return 0;
 712 }
 713
 714 static struct fb_ops atmel_lcdfb_ops = {
 715         .owner          = THIS_MODULE,
 716         .fb_check_var   = atmel_lcdfb_check_var,
 717         .fb_set_par     = atmel_lcdfb_set_par,
 718         .fb_setcolreg   = atmel_lcdfb_setcolreg,
 719         .fb_pan_display = atmel_lcdfb_pan_display,
 720         .fb_fillrect    = cfb_fillrect,
 721         .fb_copyarea    = cfb_copyarea,
 722         .fb_imageblit   = cfb_imageblit,
 723 };
 724
 725 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
 726 {
 727         struct fb_info *info = dev_id;
 728         struct atmel_lcdfb_info *sinfo = info->par;
 729         u32 status;
 730
 731         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
 732         if (status & ATMEL_LCDC_UFLWI) {
 733                 dev_warn(info->device, "FIFO underflow %#x\n", status);
 734                 /* reset DMA and FIFO to avoid screen shifting */
 735                 schedule_work(&sinfo->task);
 736         }
 737         lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
 738         return IRQ_HANDLED;
 739 }
 740
 741 /*
 742  * LCD controller task (to reset the LCD)
 743  */
 744 static void atmel_lcdfb_task(struct work_struct *work)
 745 {
 746         struct atmel_lcdfb_info *sinfo =
 747                 container_of(work, struct atmel_lcdfb_info, task);
 748
 749         atmel_lcdfb_reset(sinfo);
 750 }
 751
 752 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
 753 {
 754         struct fb_info *info = sinfo->info;
 755         int ret = 0;
 756
 757         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
 758
 759         dev_info(info->device,
 760                "%luKiB frame buffer at %08lx (mapped at %p)\n",
 761                (unsigned long)info->fix.smem_len / 1024,
 762                (unsigned long)info->fix.smem_start,
 763                info->screen_base);
 764
 765         /* Allocate colormap */
 766         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 767         if (ret < 0)
 768                 dev_err(info->device, "Alloc color map failed\n");
 769
 770         return ret;
 771 }
 772
 773 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
 774 {
 775         if (sinfo->bus_clk)
 776                 clk_enable(sinfo->bus_clk);
 777         clk_enable(sinfo->lcdc_clk);
 778 }
 779
 780 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
 781 {
 782         if (sinfo->bus_clk)
 783                 clk_disable(sinfo->bus_clk);
 784         clk_disable(sinfo->lcdc_clk);
 785 }
 786
 787
 788 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
 789 {
 790         struct device *dev = &pdev->dev;
 791         struct fb_info *info;
 792         struct atmel_lcdfb_info *sinfo;
 793         struct atmel_lcdfb_info *pdata_sinfo;
 794         struct fb_videomode fbmode;
 795         struct resource *regs = NULL;
 796         struct resource *map = NULL;
 797         int ret;
 798
 799         dev_dbg(dev, "%s BEGIN\n", __func__);
 800
 801         ret = -ENOMEM;
 802         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
 803         if (!info) {
 804                 dev_err(dev, "cannot allocate memory\n");
 805                 goto out;
 806         }
 807
 808         sinfo = info->par;
 809
 810         if (dev->platform_data) {
 811                 pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data;
 812                 sinfo->default_bpp = pdata_sinfo->default_bpp;
 813                 sinfo->default_dmacon = pdata_sinfo->default_dmacon;
 814                 sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2;
 815                 sinfo->default_monspecs = pdata_sinfo->default_monspecs;
 816                 sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
 817                 sinfo->guard_time = pdata_sinfo->guard_time;
 818                 sinfo->smem_len = pdata_sinfo->smem_len;
 819                 sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
 820                 sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
 821         } else {
 822                 dev_err(dev, "cannot get default configuration\n");
 823                 goto free_info;
 824         }
 825         sinfo->info = info;
 826         sinfo->pdev = pdev;
 827
 828         strcpy(info->fix.id, sinfo->pdev->name);
 829         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
 830         info->pseudo_palette = sinfo->pseudo_palette;
 831         info->fbops = &atmel_lcdfb_ops;
 832
 833         memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs));
 834         info->fix = atmel_lcdfb_fix;
 835
 836         /* Enable LCDC Clocks */
 837         if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()
 838          || cpu_is_at32ap7000()) {
 839                 sinfo->bus_clk = clk_get(dev, "hck1");
 840                 if (IS_ERR(sinfo->bus_clk)) {
 841                         ret = PTR_ERR(sinfo->bus_clk);
 842                         goto free_info;
 843                 }
 844         }
 845         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
 846         if (IS_ERR(sinfo->lcdc_clk)) {
 847                 ret = PTR_ERR(sinfo->lcdc_clk);
 848                 goto put_bus_clk;
 849         }
 850         atmel_lcdfb_start_clock(sinfo);
 851
 852         ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
 853                         info->monspecs.modedb_len, info->monspecs.modedb,
 854                         sinfo->default_bpp);
 855         if (!ret) {
 856                 dev_err(dev, "no suitable video mode found\n");
 857                 goto stop_clk;
 858         }
 859
 860
 861         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 862         if (!regs) {
 863                 dev_err(dev, "resources unusable\n");
 864                 ret = -ENXIO;
 865                 goto stop_clk;
 866         }
 867
 868         sinfo->irq_base = platform_get_irq(pdev, 0);
 869         if (sinfo->irq_base < 0) {
 870                 dev_err(dev, "unable to get irq\n");
 871                 ret = sinfo->irq_base;
 872                 goto stop_clk;
 873         }
 874
 875         /* Initialize video memory */
 876         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 877         if (map) {
 878                 /* use a pre-allocated memory buffer */
 879                 info->fix.smem_start = map->start;
 880                 info->fix.smem_len = map->end - map->start + 1;
 881                 if (!request_mem_region(info->fix.smem_start,
 882                                         info->fix.smem_len, pdev->name)) {
 883                         ret = -EBUSY;
 884                         goto stop_clk;
 885                 }
 886
 887                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 888                 if (!info->screen_base)
 889                         goto release_intmem;
 890
 891                 /*
 892                  * Don't clear the framebuffer -- someone may have set
 893                  * up a splash image.
 894                  */
 895         } else {
 896                 /* alocate memory buffer */
 897                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
 898                 if (ret < 0) {
 899                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
 900                         goto stop_clk;
 901                 }
 902         }
 903
 904         /* LCDC registers */
 905         info->fix.mmio_start = regs->start;
 906         info->fix.mmio_len = regs->end - regs->start + 1;
 907
 908         if (!request_mem_region(info->fix.mmio_start,
 909                                 info->fix.mmio_len, pdev->name)) {
 910                 ret = -EBUSY;
 911                 goto free_fb;
 912         }
 913
 914         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
 915         if (!sinfo->mmio) {
 916                 dev_err(dev, "cannot map LCDC registers\n");
 917                 goto release_mem;
 918         }
 919
 920         /* Initialize PWM for contrast or backlight ("off") */
 921         init_contrast(sinfo);
 922
 923         /* interrupt */
 924         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
 925         if (ret) {
 926                 dev_err(dev, "request_irq failed: %d\n", ret);
 927                 goto unmap_mmio;
 928         }
 929
 930         /* Some operations on the LCDC might sleep and
 931          * require a preemptible task context */
 932         INIT_WORK(&sinfo->task, atmel_lcdfb_task);
 933
 934         ret = atmel_lcdfb_init_fbinfo(sinfo);
 935         if (ret < 0) {
 936                 dev_err(dev, "init fbinfo failed: %d\n", ret);
 937                 goto unregister_irqs;
 938         }
 939
 940         /*
 941          * This makes sure that our colour bitfield
 942          * descriptors are correctly initialised.
 943          */
 944         atmel_lcdfb_check_var(&info->var, info);
 945
 946         ret = fb_set_var(info, &info->var);
 947         if (ret) {
 948                 dev_warn(dev, "unable to set display parameters\n");
 949                 goto free_cmap;
 950         }
 951
 952         dev_set_drvdata(dev, info);
 953
 954         /*
 955          * Tell the world that we're ready to go
 956          */
 957         ret = register_framebuffer(info);
 958         if (ret < 0) {
 959                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
 960                 goto reset_drvdata;
 961         }
 962
 963         /* add selected videomode to modelist */
 964         fb_var_to_videomode(&fbmode, &info->var);
 965         fb_add_videomode(&fbmode, &info->modelist);
 966
 967         /* Power up the LCDC screen */
 968         if (sinfo->atmel_lcdfb_power_control)
 969                 sinfo->atmel_lcdfb_power_control(1);
 970
 971         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
 972                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
 973
 974         return 0;
 975
 976 reset_drvdata:
 977         dev_set_drvdata(dev, NULL);
 978 free_cmap:
 979         fb_dealloc_cmap(&info->cmap);
 980 unregister_irqs:
 981         cancel_work_sync(&sinfo->task);
 982         free_irq(sinfo->irq_base, info);
 983 unmap_mmio:
 984         exit_backlight(sinfo);
 985         iounmap(sinfo->mmio);
 986 release_mem:
 987         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
 988 free_fb:
 989         if (map)
 990                 iounmap(info->screen_base);
 991         else
 992                 atmel_lcdfb_free_video_memory(sinfo);
 993
 994 release_intmem:
 995         if (map)
 996                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
 997 stop_clk:
 998         atmel_lcdfb_stop_clock(sinfo);
 999         clk_put(sinfo->lcdc_clk);
1000 put_bus_clk:
1001         if (sinfo->bus_clk)
1002                 clk_put(sinfo->bus_clk);
1003 free_info:
1004         framebuffer_release(info);
1005 out:
1006         dev_dbg(dev, "%s FAILED\n", __func__);
1007         return ret;
1008 }
1009
1010 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1011 {
1012         struct device *dev = &pdev->dev;
1013         struct fb_info *info = dev_get_drvdata(dev);
1014         struct atmel_lcdfb_info *sinfo;
1015
1016         if (!info || !info->par)
1017                 return 0;
1018         sinfo = info->par;
1019
1020         cancel_work_sync(&sinfo->task);
1021         exit_backlight(sinfo);
1022         if (sinfo->atmel_lcdfb_power_control)
1023                 sinfo->atmel_lcdfb_power_control(0);
1024         unregister_framebuffer(info);
1025         atmel_lcdfb_stop_clock(sinfo);
1026         clk_put(sinfo->lcdc_clk);
1027         if (sinfo->bus_clk)
1028                 clk_put(sinfo->bus_clk);
1029         fb_dealloc_cmap(&info->cmap);
1030         free_irq(sinfo->irq_base, info);
1031         iounmap(sinfo->mmio);
1032         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1033         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1034                 iounmap(info->screen_base);
1035                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1036         } else {
1037                 atmel_lcdfb_free_video_memory(sinfo);
1038         }
1039
1040         dev_set_drvdata(dev, NULL);
1041         framebuffer_release(info);
1042
1043         return 0;
1044 }
1045
1046 #ifdef CONFIG_PM
1047
1048 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1049 {
1050         struct fb_info *info = platform_get_drvdata(pdev);
1051         struct atmel_lcdfb_info *sinfo = info->par;
1052
1053         /*
1054          * We don't want to handle interrupts while the clock is
1055          * stopped. It may take forever.
1056          */
1057         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1058
1059         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
1060         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1061         if (sinfo->atmel_lcdfb_power_control)
1062                 sinfo->atmel_lcdfb_power_control(0);
1063
1064         atmel_lcdfb_stop(sinfo);
1065         atmel_lcdfb_stop_clock(sinfo);
1066
1067         return 0;
1068 }
1069
1070 static int atmel_lcdfb_resume(struct platform_device *pdev)
1071 {
1072         struct fb_info *info = platform_get_drvdata(pdev);
1073         struct atmel_lcdfb_info *sinfo = info->par;
1074
1075         atmel_lcdfb_start_clock(sinfo);
1076         atmel_lcdfb_start(sinfo);
1077         if (sinfo->atmel_lcdfb_power_control)
1078                 sinfo->atmel_lcdfb_power_control(1);
1079         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1080
1081         /* Enable FIFO & DMA errors */
1082         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1083                         | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1084
1085         return 0;
1086 }
1087
1088 #else
1089 #define atmel_lcdfb_suspend     NULL
1090 #define atmel_lcdfb_resume      NULL
1091 #endif
1092
1093 static struct platform_driver atmel_lcdfb_driver = {
1094         .remove         = __exit_p(atmel_lcdfb_remove),
1095         .suspend        = atmel_lcdfb_suspend,
1096         .resume         = atmel_lcdfb_resume,
1097
1098         .driver         = {
1099                 .name   = "atmel_lcdfb",
1100                 .owner  = THIS_MODULE,
1101         },
1102 };
1103
1104 static int __init atmel_lcdfb_init(void)
1105 {
1106         return platform_driver_probe(&atmel_lcdfb_driver, atmel_lcdfb_probe);
1107 }
1108
1109 static void __exit atmel_lcdfb_exit(void)
1110 {
1111         platform_driver_unregister(&atmel_lcdfb_driver);
1112 }
1113
1114 module_init(atmel_lcdfb_init);
1115 module_exit(atmel_lcdfb_exit);
1116
1117 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1118 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1119 MODULE_LICENSE("GPL");