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
  21 #include <asm/arch/board.h>
  22 #include <asm/arch/cpu.h>
  23 #include <asm/arch/gpio.h>
  24
  25 #include <video/atmel_lcdc.h>
  26
  27 #define lcdc_readl(sinfo, reg)          __raw_readl((sinfo)->mmio+(reg))
  28 #define lcdc_writel(sinfo, reg, val)    __raw_writel((val), (sinfo)->mmio+(reg))
  29
  30 /* configurable parameters */
  31 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
  32 #define ATMEL_LCDC_DMA_BURST_LEN        8
  33
  34 #if defined(CONFIG_ARCH_AT91SAM9263) || defined(CONFIG_ARCH_AT91CAP9) || \
  35         defined(CONFIG_ARCH_AT91SAM9RL)
  36 #define ATMEL_LCDC_FIFO_SIZE            2048
  37 #else
  38 #define ATMEL_LCDC_FIFO_SIZE            512
  39 #endif
  40
  41 #if defined(CONFIG_ARCH_AT91)
  42 #define ATMEL_LCDFB_FBINFO_DEFAULT      FBINFO_DEFAULT
  43
  44 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
  45                                         struct fb_var_screeninfo *var)
  46 {
  47
  48 }
  49 #elif defined(CONFIG_AVR32)
  50 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
  51                                         | FBINFO_PARTIAL_PAN_OK \
  52                                         | FBINFO_HWACCEL_XPAN \
  53                                         | FBINFO_HWACCEL_YPAN)
  54
  55 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
  56                                      struct fb_var_screeninfo *var)
  57 {
  58         u32 dma2dcfg;
  59         u32 pixeloff;
  60
  61         pixeloff = (var->xoffset * var->bits_per_pixel) & 0x1f;
  62
  63         dma2dcfg = ((var->xres_virtual - var->xres) * var->bits_per_pixel) / 8;
  64         dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
  65         lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
  66
  67         /* Update configuration */
  68         lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
  69                     lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
  70                     | ATMEL_LCDC_DMAUPDT);
  71 }
  72 #endif
  73
  74 static const u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
  75                 | ATMEL_LCDC_POL_POSITIVE
  76                 | ATMEL_LCDC_ENA_PWMENABLE;
  77
  78 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
  79
  80 /* some bl->props field just changed */
  81 static int atmel_bl_update_status(struct backlight_device *bl)
  82 {
  83         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
  84         int                     power = sinfo->bl_power;
  85         int                     brightness = bl->props.brightness;
  86
  87         /* REVISIT there may be a meaningful difference between
  88          * fb_blank and power ... there seem to be some cases
  89          * this doesn't handle correctly.
  90          */
  91         if (bl->props.fb_blank != sinfo->bl_power)
  92                 power = bl->props.fb_blank;
  93         else if (bl->props.power != sinfo->bl_power)
  94                 power = bl->props.power;
  95
  96         if (brightness < 0 && power == FB_BLANK_UNBLANK)
  97                 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
  98         else if (power != FB_BLANK_UNBLANK)
  99                 brightness = 0;
 100
 101         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
 102         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
 103                         brightness ? contrast_ctr : 0);
 104
 105         bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
 106
 107         return 0;
 108 }
 109
 110 static int atmel_bl_get_brightness(struct backlight_device *bl)
 111 {
 112         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 113
 114         return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 115 }
 116
 117 static struct backlight_ops atmel_lcdc_bl_ops = {
 118         .update_status = atmel_bl_update_status,
 119         .get_brightness = atmel_bl_get_brightness,
 120 };
 121
 122 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 123 {
 124         struct backlight_device *bl;
 125
 126         sinfo->bl_power = FB_BLANK_UNBLANK;
 127
 128         if (sinfo->backlight)
 129                 return;
 130
 131         bl = backlight_device_register("backlight", &sinfo->pdev->dev,
 132                         sinfo, &atmel_lcdc_bl_ops);
 133         if (IS_ERR(sinfo->backlight)) {
 134                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
 135                                 PTR_ERR(bl));
 136                 return;
 137         }
 138         sinfo->backlight = bl;
 139
 140         bl->props.power = FB_BLANK_UNBLANK;
 141         bl->props.fb_blank = FB_BLANK_UNBLANK;
 142         bl->props.max_brightness = 0xff;
 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       = 0,
 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_at32ap7000()))
 190                 return xres;
 191
 192         value = xres;
 193         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
 194                 /* STN display */
 195                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
 196                         value *= 3;
 197                 }
 198                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
 199                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
 200                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
 201                         value = DIV_ROUND_UP(value, 4);
 202                 else
 203                         value = DIV_ROUND_UP(value, 8);
 204         }
 205
 206         return value;
 207 }
 208
 209 static void atmel_lcdfb_update_dma(struct fb_info *info,
 210                                struct fb_var_screeninfo *var)
 211 {
 212         struct atmel_lcdfb_info *sinfo = info->par;
 213         struct fb_fix_screeninfo *fix = &info->fix;
 214         unsigned long dma_addr;
 215
 216         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
 217                     + var->xoffset * var->bits_per_pixel / 8);
 218
 219         dma_addr &= ~3UL;
 220
 221         /* Set framebuffer DMA base address and pixel offset */
 222         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
 223
 224         atmel_lcdfb_update_dma2d(sinfo, var);
 225 }
 226
 227 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
 228 {
 229         struct fb_info *info = sinfo->info;
 230
 231         dma_free_writecombine(info->device, info->fix.smem_len,
 232                                 info->screen_base, info->fix.smem_start);
 233 }
 234
 235 /**
 236  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
 237  *      @sinfo: the frame buffer to allocate memory for
 238  */
 239 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
 240 {
 241         struct fb_info *info = sinfo->info;
 242         struct fb_var_screeninfo *var = &info->var;
 243
 244         info->fix.smem_len = (var->xres_virtual * var->yres_virtual
 245                             * ((var->bits_per_pixel + 7) / 8));
 246
 247         info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
 248                                         (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
 249
 250         if (!info->screen_base) {
 251                 return -ENOMEM;
 252         }
 253
 254         memset(info->screen_base, 0, info->fix.smem_len);
 255
 256         return 0;
 257 }
 258
 259 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
 260                                                      struct fb_info *info)
 261 {
 262         struct fb_videomode varfbmode;
 263         const struct fb_videomode *fbmode = NULL;
 264
 265         fb_var_to_videomode(&varfbmode, var);
 266         fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
 267         if (fbmode)
 268                 fb_videomode_to_var(var, fbmode);
 269         return fbmode;
 270 }
 271
 272
 273 /**
 274  *      atmel_lcdfb_check_var - Validates a var passed in.
 275  *      @var: frame buffer variable screen structure
 276  *      @info: frame buffer structure that represents a single frame buffer
 277  *
 278  *      Checks to see if the hardware supports the state requested by
 279  *      var passed in. This function does not alter the hardware
 280  *      state!!!  This means the data stored in struct fb_info and
 281  *      struct atmel_lcdfb_info do not change. This includes the var
 282  *      inside of struct fb_info.  Do NOT change these. This function
 283  *      can be called on its own if we intent to only test a mode and
 284  *      not actually set it. The stuff in modedb.c is a example of
 285  *      this. If the var passed in is slightly off by what the
 286  *      hardware can support then we alter the var PASSED in to what
 287  *      we can do. If the hardware doesn't support mode change a
 288  *      -EINVAL will be returned by the upper layers. You don't need
 289  *      to implement this function then. If you hardware doesn't
 290  *      support changing the resolution then this function is not
 291  *      needed. In this case the driver would just provide a var that
 292  *      represents the static state the screen is in.
 293  *
 294  *      Returns negative errno on error, or zero on success.
 295  */
 296 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
 297                              struct fb_info *info)
 298 {
 299         struct device *dev = info->device;
 300         struct atmel_lcdfb_info *sinfo = info->par;
 301         unsigned long clk_value_khz;
 302
 303         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 304
 305         dev_dbg(dev, "%s:\n", __func__);
 306
 307         if (!(var->pixclock && var->bits_per_pixel)) {
 308                 /* choose a suitable mode if possible */
 309                 if (!atmel_lcdfb_choose_mode(var, info)) {
 310                         dev_err(dev, "needed value not specified\n");
 311                         return -EINVAL;
 312                 }
 313         }
 314
 315         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
 316         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
 317         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
 318         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
 319
 320         if ((PICOS2KHZ(var->pixclock) * var->bits_per_pixel / 8) > clk_value_khz) {
 321                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
 322                 return -EINVAL;
 323         }
 324
 325         /* Do not allow to have real resoulution larger than virtual */
 326         if (var->xres > var->xres_virtual)
 327                 var->xres_virtual = var->xres;
 328
 329         if (var->yres > var->yres_virtual)
 330                 var->yres_virtual = var->yres;
 331
 332         /* Force same alignment for each line */
 333         var->xres = (var->xres + 3) & ~3UL;
 334         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
 335
 336         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
 337         var->transp.msb_right = 0;
 338         var->transp.offset = var->transp.length = 0;
 339         var->xoffset = var->yoffset = 0;
 340
 341         /* Saturate vertical and horizontal timings at maximum values */
 342         var->vsync_len = min_t(u32, var->vsync_len,
 343                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
 344         var->upper_margin = min_t(u32, var->upper_margin,
 345                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
 346         var->lower_margin = min_t(u32, var->lower_margin,
 347                         ATMEL_LCDC_VFP);
 348         var->right_margin = min_t(u32, var->right_margin,
 349                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
 350         var->hsync_len = min_t(u32, var->hsync_len,
 351                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
 352         var->left_margin = min_t(u32, var->left_margin,
 353                         ATMEL_LCDC_HBP + 1);
 354
 355         /* Some parameters can't be zero */
 356         var->vsync_len = max_t(u32, var->vsync_len, 1);
 357         var->right_margin = max_t(u32, var->right_margin, 1);
 358         var->hsync_len = max_t(u32, var->hsync_len, 1);
 359         var->left_margin = max_t(u32, var->left_margin, 1);
 360
 361         switch (var->bits_per_pixel) {
 362         case 1:
 363         case 2:
 364         case 4:
 365         case 8:
 366                 var->red.offset = var->green.offset = var->blue.offset = 0;
 367                 var->red.length = var->green.length = var->blue.length
 368                         = var->bits_per_pixel;
 369                 break;
 370         case 15:
 371         case 16:
 372                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 373                         /* RGB:565 mode */
 374                         var->red.offset = 11;
 375                         var->blue.offset = 0;
 376                         var->green.length = 6;
 377                 } else {
 378                         /* BGR:555 mode */
 379                         var->red.offset = 0;
 380                         var->blue.offset = 10;
 381                         var->green.length = 5;
 382                 }
 383                 var->green.offset = 5;
 384                 var->red.length = var->blue.length = 5;
 385                 break;
 386         case 32:
 387                 var->transp.offset = 24;
 388                 var->transp.length = 8;
 389                 /* fall through */
 390         case 24:
 391                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 392                         /* RGB:888 mode */
 393                         var->red.offset = 16;
 394                         var->blue.offset = 0;
 395                 } else {
 396                         /* BGR:888 mode */
 397                         var->red.offset = 0;
 398                         var->blue.offset = 16;
 399                 }
 400                 var->green.offset = 8;
 401                 var->red.length = var->green.length = var->blue.length = 8;
 402                 break;
 403         default:
 404                 dev_err(dev, "color depth %d not supported\n",
 405                                         var->bits_per_pixel);
 406                 return -EINVAL;
 407         }
 408
 409         return 0;
 410 }
 411
 412 /*
 413  * LCD reset sequence
 414  */
 415 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
 416 {
 417         might_sleep();
 418
 419         /* LCD power off */
 420         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON, sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
 421
 422         /* wait for the LCDC core to become idle */
 423         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 424                 msleep(10);
 425
 426         /* DMA disable */
 427         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
 428
 429         /* wait for DMA engine to become idle */
 430         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 431                 msleep(10);
 432
 433         /* LCD power on */
 434         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 435                 (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET) | ATMEL_LCDC_PWR);
 436
 437         /* DMA enable */
 438         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon);
 439 }
 440
 441 /**
 442  *      atmel_lcdfb_set_par - Alters the hardware state.
 443  *      @info: frame buffer structure that represents a single frame buffer
 444  *
 445  *      Using the fb_var_screeninfo in fb_info we set the resolution
 446  *      of the this particular framebuffer. This function alters the
 447  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
 448  *      not alter var in fb_info since we are using that data. This
 449  *      means we depend on the data in var inside fb_info to be
 450  *      supported by the hardware.  atmel_lcdfb_check_var is always called
 451  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
 452  *      change the resolution you don't need this function.
 453  *
 454  */
 455 static int atmel_lcdfb_set_par(struct fb_info *info)
 456 {
 457         struct atmel_lcdfb_info *sinfo = info->par;
 458         unsigned long hozval_linesz;
 459         unsigned long value;
 460         unsigned long clk_value_khz;
 461         unsigned long bits_per_line;
 462
 463         might_sleep();
 464
 465         dev_dbg(info->device, "%s:\n", __func__);
 466         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
 467                  info->var.xres, info->var.yres,
 468                  info->var.xres_virtual, info->var.yres_virtual);
 469
 470         /* Turn off the LCD controller and the DMA controller */
 471         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON, sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
 472
 473         /* Wait for the LCDC core to become idle */
 474         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 475                 msleep(10);
 476
 477         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
 478
 479         if (info->var.bits_per_pixel == 1)
 480                 info->fix.visual = FB_VISUAL_MONO01;
 481         else if (info->var.bits_per_pixel <= 8)
 482                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 483         else
 484                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 485
 486         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
 487         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
 488
 489         /* Re-initialize the DMA engine... */
 490         dev_dbg(info->device, "  * update DMA engine\n");
 491         atmel_lcdfb_update_dma(info, &info->var);
 492
 493         /* ...set frame size and burst length = 8 words (?) */
 494         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
 495         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 496         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
 497
 498         /* Now, the LCDC core... */
 499
 500         /* Set pixel clock */
 501         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 502
 503         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
 504
 505         if (value < 2) {
 506                 dev_notice(info->device, "Bypassing pixel clock divider\n");
 507                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 508         } else {
 509                 value = (value / 2) - 1;
 510                 dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
 511                                 value);
 512                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
 513                                 value << ATMEL_LCDC_CLKVAL_OFFSET);
 514                 info->var.pixclock = KHZ2PICOS(clk_value_khz / (2 * (value + 1)));
 515                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
 516                                         PICOS2KHZ(info->var.pixclock));
 517         }
 518
 519
 520         /* Initialize control register 2 */
 521         value = sinfo->default_lcdcon2;
 522
 523         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
 524                 value |= ATMEL_LCDC_INVLINE_INVERTED;
 525         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
 526                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
 527
 528         switch (info->var.bits_per_pixel) {
 529                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
 530                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
 531                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
 532                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
 533                 case 15: /* fall through */
 534                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
 535                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
 536                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
 537                 default: BUG(); break;
 538         }
 539         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
 540         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
 541
 542         /* Vertical timing */
 543         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 544         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
 545         value |= info->var.lower_margin;
 546         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
 547         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
 548
 549         /* Horizontal timing */
 550         value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 551         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 552         value |= (info->var.left_margin - 1);
 553         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
 554         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
 555
 556         /* Horizontal value (aka line size) */
 557         hozval_linesz = compute_hozval(info->var.xres,
 558                                         lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2));
 559
 560         /* Display size */
 561         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 562         value |= info->var.yres - 1;
 563         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
 564         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
 565
 566         /* FIFO Threshold: Use formula from data sheet */
 567         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 568         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
 569
 570         /* Toggle LCD_MODE every frame */
 571         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
 572
 573         /* Disable all interrupts */
 574         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
 575         /* Enable FIFO & DMA errors */
 576         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
 577
 578         /* ...wait for DMA engine to become idle... */
 579         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 580                 msleep(10);
 581
 582         dev_dbg(info->device, "  * re-enable DMA engine\n");
 583         /* ...and enable it with updated configuration */
 584         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon);
 585
 586         dev_dbg(info->device, "  * re-enable LCDC core\n");
 587         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 588                 (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET) | ATMEL_LCDC_PWR);
 589
 590         dev_dbg(info->device, "  * DONE\n");
 591
 592         return 0;
 593 }
 594
 595 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
 596 {
 597         chan &= 0xffff;
 598         chan >>= 16 - bf->length;
 599         return chan << bf->offset;
 600 }
 601
 602 /**
 603  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
 604  *      @regno: Which register in the CLUT we are programming
 605  *      @red: The red value which can be up to 16 bits wide
 606  *      @green: The green value which can be up to 16 bits wide
 607  *      @blue:  The blue value which can be up to 16 bits wide.
 608  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 609  *      @info: frame buffer info structure
 610  *
 611  *      Set a single color register. The values supplied have a 16 bit
 612  *      magnitude which needs to be scaled in this function for the hardware.
 613  *      Things to take into consideration are how many color registers, if
 614  *      any, are supported with the current color visual. With truecolor mode
 615  *      no color palettes are supported. Here a psuedo palette is created
 616  *      which we store the value in pseudo_palette in struct fb_info. For
 617  *      pseudocolor mode we have a limited color palette. To deal with this
 618  *      we can program what color is displayed for a particular pixel value.
 619  *      DirectColor is similar in that we can program each color field. If
 620  *      we have a static colormap we don't need to implement this function.
 621  *
 622  *      Returns negative errno on error, or zero on success. In an
 623  *      ideal world, this would have been the case, but as it turns
 624  *      out, the other drivers return 1 on failure, so that's what
 625  *      we're going to do.
 626  */
 627 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
 628                              unsigned int green, unsigned int blue,
 629                              unsigned int transp, struct fb_info *info)
 630 {
 631         struct atmel_lcdfb_info *sinfo = info->par;
 632         unsigned int val;
 633         u32 *pal;
 634         int ret = 1;
 635
 636         if (info->var.grayscale)
 637                 red = green = blue = (19595 * red + 38470 * green
 638                                       + 7471 * blue) >> 16;
 639
 640         switch (info->fix.visual) {
 641         case FB_VISUAL_TRUECOLOR:
 642                 if (regno < 16) {
 643                         pal = info->pseudo_palette;
 644
 645                         val  = chan_to_field(red, &info->var.red);
 646                         val |= chan_to_field(green, &info->var.green);
 647                         val |= chan_to_field(blue, &info->var.blue);
 648
 649                         pal[regno] = val;
 650                         ret = 0;
 651                 }
 652                 break;
 653
 654         case FB_VISUAL_PSEUDOCOLOR:
 655                 if (regno < 256) {
 656                         val  = ((red   >> 11) & 0x001f);
 657                         val |= ((green >>  6) & 0x03e0);
 658                         val |= ((blue  >>  1) & 0x7c00);
 659
 660                         /*
 661                          * TODO: intensity bit. Maybe something like
 662                          *   ~(red[10] ^ green[10] ^ blue[10]) & 1
 663                          */
 664
 665                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 666                         ret = 0;
 667                 }
 668                 break;
 669
 670         case FB_VISUAL_MONO01:
 671                 if (regno < 2) {
 672                         val = (regno == 0) ? 0x00 : 0x1F;
 673                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 674                         ret = 0;
 675                 }
 676                 break;
 677
 678         }
 679
 680         return ret;
 681 }
 682
 683 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
 684                                struct fb_info *info)
 685 {
 686         dev_dbg(info->device, "%s\n", __func__);
 687
 688         atmel_lcdfb_update_dma(info, var);
 689
 690         return 0;
 691 }
 692
 693 static struct fb_ops atmel_lcdfb_ops = {
 694         .owner          = THIS_MODULE,
 695         .fb_check_var   = atmel_lcdfb_check_var,
 696         .fb_set_par     = atmel_lcdfb_set_par,
 697         .fb_setcolreg   = atmel_lcdfb_setcolreg,
 698         .fb_pan_display = atmel_lcdfb_pan_display,
 699         .fb_fillrect    = cfb_fillrect,
 700         .fb_copyarea    = cfb_copyarea,
 701         .fb_imageblit   = cfb_imageblit,
 702 };
 703
 704 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
 705 {
 706         struct fb_info *info = dev_id;
 707         struct atmel_lcdfb_info *sinfo = info->par;
 708         u32 status;
 709
 710         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
 711         if (status & ATMEL_LCDC_UFLWI) {
 712                 dev_warn(info->device, "FIFO underflow %#x\n", status);
 713                 /* reset DMA and FIFO to avoid screen shifting */
 714                 schedule_work(&sinfo->task);
 715         }
 716         lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
 717         return IRQ_HANDLED;
 718 }
 719
 720 /*
 721  * LCD controller task (to reset the LCD)
 722  */
 723 static void atmel_lcdfb_task(struct work_struct *work)
 724 {
 725         struct atmel_lcdfb_info *sinfo =
 726                 container_of(work, struct atmel_lcdfb_info, task);
 727
 728         atmel_lcdfb_reset(sinfo);
 729 }
 730
 731 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
 732 {
 733         struct fb_info *info = sinfo->info;
 734         int ret = 0;
 735
 736         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
 737
 738         dev_info(info->device,
 739                "%luKiB frame buffer at %08lx (mapped at %p)\n",
 740                (unsigned long)info->fix.smem_len / 1024,
 741                (unsigned long)info->fix.smem_start,
 742                info->screen_base);
 743
 744         /* Allocate colormap */
 745         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 746         if (ret < 0)
 747                 dev_err(info->device, "Alloc color map failed\n");
 748
 749         return ret;
 750 }
 751
 752 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
 753 {
 754         if (sinfo->bus_clk)
 755                 clk_enable(sinfo->bus_clk);
 756         clk_enable(sinfo->lcdc_clk);
 757 }
 758
 759 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
 760 {
 761         if (sinfo->bus_clk)
 762                 clk_disable(sinfo->bus_clk);
 763         clk_disable(sinfo->lcdc_clk);
 764 }
 765
 766
 767 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
 768 {
 769         struct device *dev = &pdev->dev;
 770         struct fb_info *info;
 771         struct atmel_lcdfb_info *sinfo;
 772         struct atmel_lcdfb_info *pdata_sinfo;
 773         struct fb_videomode fbmode;
 774         struct resource *regs = NULL;
 775         struct resource *map = NULL;
 776         int ret;
 777
 778         dev_dbg(dev, "%s BEGIN\n", __func__);
 779
 780         ret = -ENOMEM;
 781         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
 782         if (!info) {
 783                 dev_err(dev, "cannot allocate memory\n");
 784                 goto out;
 785         }
 786
 787         sinfo = info->par;
 788
 789         if (dev->platform_data) {
 790                 pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data;
 791                 sinfo->default_bpp = pdata_sinfo->default_bpp;
 792                 sinfo->default_dmacon = pdata_sinfo->default_dmacon;
 793                 sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2;
 794                 sinfo->default_monspecs = pdata_sinfo->default_monspecs;
 795                 sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
 796                 sinfo->guard_time = pdata_sinfo->guard_time;
 797                 sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
 798                 sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
 799         } else {
 800                 dev_err(dev, "cannot get default configuration\n");
 801                 goto free_info;
 802         }
 803         sinfo->info = info;
 804         sinfo->pdev = pdev;
 805
 806         strcpy(info->fix.id, sinfo->pdev->name);
 807         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
 808         info->pseudo_palette = sinfo->pseudo_palette;
 809         info->fbops = &atmel_lcdfb_ops;
 810
 811         memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs));
 812         info->fix = atmel_lcdfb_fix;
 813
 814         /* Enable LCDC Clocks */
 815         if (cpu_is_at91sam9261() || cpu_is_at32ap7000()) {
 816                 sinfo->bus_clk = clk_get(dev, "hck1");
 817                 if (IS_ERR(sinfo->bus_clk)) {
 818                         ret = PTR_ERR(sinfo->bus_clk);
 819                         goto free_info;
 820                 }
 821         }
 822         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
 823         if (IS_ERR(sinfo->lcdc_clk)) {
 824                 ret = PTR_ERR(sinfo->lcdc_clk);
 825                 goto put_bus_clk;
 826         }
 827         atmel_lcdfb_start_clock(sinfo);
 828
 829         ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
 830                         info->monspecs.modedb_len, info->monspecs.modedb,
 831                         sinfo->default_bpp);
 832         if (!ret) {
 833                 dev_err(dev, "no suitable video mode found\n");
 834                 goto stop_clk;
 835         }
 836
 837
 838         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 839         if (!regs) {
 840                 dev_err(dev, "resources unusable\n");
 841                 ret = -ENXIO;
 842                 goto stop_clk;
 843         }
 844
 845         sinfo->irq_base = platform_get_irq(pdev, 0);
 846         if (sinfo->irq_base < 0) {
 847                 dev_err(dev, "unable to get irq\n");
 848                 ret = sinfo->irq_base;
 849                 goto stop_clk;
 850         }
 851
 852         /* Initialize video memory */
 853         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 854         if (map) {
 855                 /* use a pre-allocated memory buffer */
 856                 info->fix.smem_start = map->start;
 857                 info->fix.smem_len = map->end - map->start + 1;
 858                 if (!request_mem_region(info->fix.smem_start,
 859                                         info->fix.smem_len, pdev->name)) {
 860                         ret = -EBUSY;
 861                         goto stop_clk;
 862                 }
 863
 864                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 865                 if (!info->screen_base)
 866                         goto release_intmem;
 867
 868                 /*
 869                  * Don't clear the framebuffer -- someone may have set
 870                  * up a splash image.
 871                  */
 872         } else {
 873                 /* alocate memory buffer */
 874                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
 875                 if (ret < 0) {
 876                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
 877                         goto stop_clk;
 878                 }
 879         }
 880
 881         /* LCDC registers */
 882         info->fix.mmio_start = regs->start;
 883         info->fix.mmio_len = regs->end - regs->start + 1;
 884
 885         if (!request_mem_region(info->fix.mmio_start,
 886                                 info->fix.mmio_len, pdev->name)) {
 887                 ret = -EBUSY;
 888                 goto free_fb;
 889         }
 890
 891         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
 892         if (!sinfo->mmio) {
 893                 dev_err(dev, "cannot map LCDC registers\n");
 894                 goto release_mem;
 895         }
 896
 897         /* Initialize PWM for contrast or backlight ("off") */
 898         init_contrast(sinfo);
 899
 900         /* interrupt */
 901         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
 902         if (ret) {
 903                 dev_err(dev, "request_irq failed: %d\n", ret);
 904                 goto unmap_mmio;
 905         }
 906
 907         /* Some operations on the LCDC might sleep and
 908          * require a preemptible task context */
 909         INIT_WORK(&sinfo->task, atmel_lcdfb_task);
 910
 911         ret = atmel_lcdfb_init_fbinfo(sinfo);
 912         if (ret < 0) {
 913                 dev_err(dev, "init fbinfo failed: %d\n", ret);
 914                 goto unregister_irqs;
 915         }
 916
 917         /*
 918          * This makes sure that our colour bitfield
 919          * descriptors are correctly initialised.
 920          */
 921         atmel_lcdfb_check_var(&info->var, info);
 922
 923         ret = fb_set_var(info, &info->var);
 924         if (ret) {
 925                 dev_warn(dev, "unable to set display parameters\n");
 926                 goto free_cmap;
 927         }
 928
 929         dev_set_drvdata(dev, info);
 930
 931         /*
 932          * Tell the world that we're ready to go
 933          */
 934         ret = register_framebuffer(info);
 935         if (ret < 0) {
 936                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
 937                 goto free_cmap;
 938         }
 939
 940         /* add selected videomode to modelist */
 941         fb_var_to_videomode(&fbmode, &info->var);
 942         fb_add_videomode(&fbmode, &info->modelist);
 943
 944         /* Power up the LCDC screen */
 945         if (sinfo->atmel_lcdfb_power_control)
 946                 sinfo->atmel_lcdfb_power_control(1);
 947
 948         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %lu\n",
 949                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
 950
 951         return 0;
 952
 953
 954 free_cmap:
 955         fb_dealloc_cmap(&info->cmap);
 956 unregister_irqs:
 957         cancel_work_sync(&sinfo->task);
 958         free_irq(sinfo->irq_base, info);
 959 unmap_mmio:
 960         exit_backlight(sinfo);
 961         iounmap(sinfo->mmio);
 962 release_mem:
 963         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
 964 free_fb:
 965         if (map)
 966                 iounmap(info->screen_base);
 967         else
 968                 atmel_lcdfb_free_video_memory(sinfo);
 969
 970 release_intmem:
 971         if (map)
 972                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
 973 stop_clk:
 974         atmel_lcdfb_stop_clock(sinfo);
 975         clk_put(sinfo->lcdc_clk);
 976 put_bus_clk:
 977         if (sinfo->bus_clk)
 978                 clk_put(sinfo->bus_clk);
 979 free_info:
 980         framebuffer_release(info);
 981 out:
 982         dev_dbg(dev, "%s FAILED\n", __func__);
 983         return ret;
 984 }
 985
 986 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
 987 {
 988         struct device *dev = &pdev->dev;
 989         struct fb_info *info = dev_get_drvdata(dev);
 990         struct atmel_lcdfb_info *sinfo = info->par;
 991
 992         if (!sinfo)
 993                 return 0;
 994
 995         cancel_work_sync(&sinfo->task);
 996         exit_backlight(sinfo);
 997         if (sinfo->atmel_lcdfb_power_control)
 998                 sinfo->atmel_lcdfb_power_control(0);
 999         unregister_framebuffer(info);
1000         atmel_lcdfb_stop_clock(sinfo);
1001         clk_put(sinfo->lcdc_clk);
1002         if (sinfo->bus_clk)
1003                 clk_put(sinfo->bus_clk);
1004         fb_dealloc_cmap(&info->cmap);
1005         free_irq(sinfo->irq_base, info);
1006         iounmap(sinfo->mmio);
1007         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1008         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1009                 iounmap(info->screen_base);
1010                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1011         } else {
1012                 atmel_lcdfb_free_video_memory(sinfo);
1013         }
1014
1015         dev_set_drvdata(dev, NULL);
1016         framebuffer_release(info);
1017
1018         return 0;
1019 }
1020
1021 #ifdef CONFIG_PM
1022
1023 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1024 {
1025         struct fb_info *info = platform_get_drvdata(pdev);
1026         struct atmel_lcdfb_info *sinfo = info->par;
1027
1028         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
1029         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1030         if (sinfo->atmel_lcdfb_power_control)
1031                 sinfo->atmel_lcdfb_power_control(0);
1032         atmel_lcdfb_stop_clock(sinfo);
1033         return 0;
1034 }
1035
1036 static int atmel_lcdfb_resume(struct platform_device *pdev)
1037 {
1038         struct fb_info *info = platform_get_drvdata(pdev);
1039         struct atmel_lcdfb_info *sinfo = info->par;
1040
1041         atmel_lcdfb_start_clock(sinfo);
1042         if (sinfo->atmel_lcdfb_power_control)
1043                 sinfo->atmel_lcdfb_power_control(1);
1044         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1045         return 0;
1046 }
1047
1048 #else
1049 #define atmel_lcdfb_suspend     NULL
1050 #define atmel_lcdfb_resume      NULL
1051 #endif
1052
1053 static struct platform_driver atmel_lcdfb_driver = {
1054         .remove         = __exit_p(atmel_lcdfb_remove),
1055         .suspend        = atmel_lcdfb_suspend,
1056         .resume         = atmel_lcdfb_resume,
1057
1058         .driver         = {
1059                 .name   = "atmel_lcdfb",
1060                 .owner  = THIS_MODULE,
1061         },
1062 };
1063
1064 static int __init atmel_lcdfb_init(void)
1065 {
1066         return platform_driver_probe(&atmel_lcdfb_driver, atmel_lcdfb_probe);
1067 }
1068
1069 static void __exit atmel_lcdfb_exit(void)
1070 {
1071         platform_driver_unregister(&atmel_lcdfb_driver);
1072 }
1073
1074 module_init(atmel_lcdfb_init);
1075 module_exit(atmel_lcdfb_exit);
1076
1077 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1078 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1079 MODULE_LICENSE("GPL");