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