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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 <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 #define ATMEL_LCDC_FIFO_SIZE            2048
  36 #else
  37 #define ATMEL_LCDC_FIFO_SIZE            512
  38 #endif
  39
  40 #if defined(CONFIG_ARCH_AT91)
  41 #define ATMEL_LCDFB_FBINFO_DEFAULT      FBINFO_DEFAULT
  42
  43 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
  44                                         struct fb_var_screeninfo *var)
  45 {
  46
  47 }
  48 #elif defined(CONFIG_AVR32)
  49 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
  50                                         | FBINFO_PARTIAL_PAN_OK \
  51                                         | FBINFO_HWACCEL_XPAN \
  52                                         | FBINFO_HWACCEL_YPAN)
  53
  54 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
  55                                      struct fb_var_screeninfo *var)
  56 {
  57         u32 dma2dcfg;
  58         u32 pixeloff;
  59
  60         pixeloff = (var->xoffset * var->bits_per_pixel) & 0x1f;
  61
  62         dma2dcfg = ((var->xres_virtual - var->xres) * var->bits_per_pixel) / 8;
  63         dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
  64         lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
  65
  66         /* Update configuration */
  67         lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
  68                     lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
  69                     | ATMEL_LCDC_DMAUPDT);
  70 }
  71 #endif
  72
  73 static const u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
  74                 | ATMEL_LCDC_POL_POSITIVE
  75                 | ATMEL_LCDC_ENA_PWMENABLE;
  76
  77 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
  78
  79 /* some bl->props field just changed */
  80 static int atmel_bl_update_status(struct backlight_device *bl)
  81 {
  82         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
  83         int                     power = sinfo->bl_power;
  84         int                     brightness = bl->props.brightness;
  85
  86         /* REVISIT there may be a meaningful difference between
  87          * fb_blank and power ... there seem to be some cases
  88          * this doesn't handle correctly.
  89          */
  90         if (bl->props.fb_blank != sinfo->bl_power)
  91                 power = bl->props.fb_blank;
  92         else if (bl->props.power != sinfo->bl_power)
  93                 power = bl->props.power;
  94
  95         if (brightness < 0 && power == FB_BLANK_UNBLANK)
  96                 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
  97         else if (power != FB_BLANK_UNBLANK)
  98                 brightness = 0;
  99
 100         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
 101         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
 102                         brightness ? contrast_ctr : 0);
 103
 104         bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
 105
 106         return 0;
 107 }
 108
 109 static int atmel_bl_get_brightness(struct backlight_device *bl)
 110 {
 111         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 112
 113         return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 114 }
 115
 116 static struct backlight_ops atmel_lcdc_bl_ops = {
 117         .update_status = atmel_bl_update_status,
 118         .get_brightness = atmel_bl_get_brightness,
 119 };
 120
 121 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 122 {
 123         struct backlight_device *bl;
 124
 125         sinfo->bl_power = FB_BLANK_UNBLANK;
 126
 127         if (sinfo->backlight)
 128                 return;
 129
 130         bl = backlight_device_register("backlight", &sinfo->pdev->dev,
 131                         sinfo, &atmel_lcdc_bl_ops);
 132         if (IS_ERR(sinfo->backlight)) {
 133                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
 134                                 PTR_ERR(bl));
 135                 return;
 136         }
 137         sinfo->backlight = bl;
 138
 139         bl->props.power = FB_BLANK_UNBLANK;
 140         bl->props.fb_blank = FB_BLANK_UNBLANK;
 141         bl->props.max_brightness = 0xff;
 142         bl->props.brightness = atmel_bl_get_brightness(bl);
 143 }
 144
 145 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 146 {
 147         if (sinfo->backlight)
 148                 backlight_device_unregister(sinfo->backlight);
 149 }
 150
 151 #else
 152
 153 static void init_backlight(struct atmel_lcdfb_info *sinfo)
 154 {
 155         dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
 156 }
 157
 158 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 159 {
 160 }
 161
 162 #endif
 163
 164 static void init_contrast(struct atmel_lcdfb_info *sinfo)
 165 {
 166         /* have some default contrast/backlight settings */
 167         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 168         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 169
 170         if (sinfo->lcdcon_is_backlight)
 171                 init_backlight(sinfo);
 172 }
 173
 174
 175 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
 176         .type           = FB_TYPE_PACKED_PIXELS,
 177         .visual         = FB_VISUAL_TRUECOLOR,
 178         .xpanstep       = 0,
 179         .ypanstep       = 0,
 180         .ywrapstep      = 0,
 181         .accel          = FB_ACCEL_NONE,
 182 };
 183
 184 static unsigned long compute_hozval(unsigned long xres, unsigned long lcdcon2)
 185 {
 186         unsigned long value;
 187
 188         if (!(cpu_is_at91sam9261() || cpu_is_at32ap7000()))
 189                 return xres;
 190
 191         value = xres;
 192         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
 193                 /* STN display */
 194                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
 195                         value *= 3;
 196                 }
 197                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
 198                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
 199                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
 200                         value = DIV_ROUND_UP(value, 4);
 201                 else
 202                         value = DIV_ROUND_UP(value, 8);
 203         }
 204
 205         return value;
 206 }
 207
 208 static void atmel_lcdfb_update_dma(struct fb_info *info,
 209                                struct fb_var_screeninfo *var)
 210 {
 211         struct atmel_lcdfb_info *sinfo = info->par;
 212         struct fb_fix_screeninfo *fix = &info->fix;
 213         unsigned long dma_addr;
 214
 215         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
 216                     + var->xoffset * var->bits_per_pixel / 8);
 217
 218         dma_addr &= ~3UL;
 219
 220         /* Set framebuffer DMA base address and pixel offset */
 221         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
 222
 223         atmel_lcdfb_update_dma2d(sinfo, var);
 224 }
 225
 226 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
 227 {
 228         struct fb_info *info = sinfo->info;
 229
 230         dma_free_writecombine(info->device, info->fix.smem_len,
 231                                 info->screen_base, info->fix.smem_start);
 232 }
 233
 234 /**
 235  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
 236  *      @sinfo: the frame buffer to allocate memory for
 237  */
 238 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
 239 {
 240         struct fb_info *info = sinfo->info;
 241         struct fb_var_screeninfo *var = &info->var;
 242
 243         info->fix.smem_len = (var->xres_virtual * var->yres_virtual
 244                             * ((var->bits_per_pixel + 7) / 8));
 245
 246         info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
 247                                         (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
 248
 249         if (!info->screen_base) {
 250                 return -ENOMEM;
 251         }
 252
 253         memset(info->screen_base, 0, info->fix.smem_len);
 254
 255         return 0;
 256 }
 257
 258 /**
 259  *      atmel_lcdfb_check_var - Validates a var passed in.
 260  *      @var: frame buffer variable screen structure
 261  *      @info: frame buffer structure that represents a single frame buffer
 262  *
 263  *      Checks to see if the hardware supports the state requested by
 264  *      var passed in. This function does not alter the hardware
 265  *      state!!!  This means the data stored in struct fb_info and
 266  *      struct atmel_lcdfb_info do not change. This includes the var
 267  *      inside of struct fb_info.  Do NOT change these. This function
 268  *      can be called on its own if we intent to only test a mode and
 269  *      not actually set it. The stuff in modedb.c is a example of
 270  *      this. If the var passed in is slightly off by what the
 271  *      hardware can support then we alter the var PASSED in to what
 272  *      we can do. If the hardware doesn't support mode change a
 273  *      -EINVAL will be returned by the upper layers. You don't need
 274  *      to implement this function then. If you hardware doesn't
 275  *      support changing the resolution then this function is not
 276  *      needed. In this case the driver would just provide a var that
 277  *      represents the static state the screen is in.
 278  *
 279  *      Returns negative errno on error, or zero on success.
 280  */
 281 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
 282                              struct fb_info *info)
 283 {
 284         struct device *dev = info->device;
 285         struct atmel_lcdfb_info *sinfo = info->par;
 286         unsigned long clk_value_khz;
 287
 288         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 289
 290         dev_dbg(dev, "%s:\n", __func__);
 291         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
 292         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
 293         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
 294         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
 295
 296         if ((PICOS2KHZ(var->pixclock) * var->bits_per_pixel / 8) > clk_value_khz) {
 297                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
 298                 return -EINVAL;
 299         }
 300
 301         /* Force same alignment for each line */
 302         var->xres = (var->xres + 3) & ~3UL;
 303         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
 304
 305         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
 306         var->transp.msb_right = 0;
 307         var->transp.offset = var->transp.length = 0;
 308         var->xoffset = var->yoffset = 0;
 309
 310         /* Saturate vertical and horizontal timings at maximum values */
 311         var->vsync_len = min_t(u32, var->vsync_len,
 312                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
 313         var->upper_margin = min_t(u32, var->upper_margin,
 314                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
 315         var->lower_margin = min_t(u32, var->lower_margin,
 316                         ATMEL_LCDC_VFP);
 317         var->right_margin = min_t(u32, var->right_margin,
 318                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
 319         var->hsync_len = min_t(u32, var->hsync_len,
 320                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
 321         var->left_margin = min_t(u32, var->left_margin,
 322                         ATMEL_LCDC_HBP + 1);
 323
 324         /* Some parameters can't be zero */
 325         var->vsync_len = max_t(u32, var->vsync_len, 1);
 326         var->right_margin = max_t(u32, var->right_margin, 1);
 327         var->hsync_len = max_t(u32, var->hsync_len, 1);
 328         var->left_margin = max_t(u32, var->left_margin, 1);
 329
 330         switch (var->bits_per_pixel) {
 331         case 1:
 332         case 2:
 333         case 4:
 334         case 8:
 335                 var->red.offset = var->green.offset = var->blue.offset = 0;
 336                 var->red.length = var->green.length = var->blue.length
 337                         = var->bits_per_pixel;
 338                 break;
 339         case 15:
 340         case 16:
 341                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 342                         /* RGB:565 mode */
 343                         var->red.offset = 11;
 344                         var->blue.offset = 0;
 345                         var->green.length = 6;
 346                 } else {
 347                         /* BGR:555 mode */
 348                         var->red.offset = 0;
 349                         var->blue.offset = 10;
 350                         var->green.length = 5;
 351                 }
 352                 var->green.offset = 5;
 353                 var->red.length = var->blue.length = 5;
 354                 break;
 355         case 32:
 356                 var->transp.offset = 24;
 357                 var->transp.length = 8;
 358                 /* fall through */
 359         case 24:
 360                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 361                         /* RGB:888 mode */
 362                         var->red.offset = 16;
 363                         var->blue.offset = 0;
 364                 } else {
 365                         /* BGR:888 mode */
 366                         var->red.offset = 0;
 367                         var->blue.offset = 16;
 368                 }
 369                 var->green.offset = 8;
 370                 var->red.length = var->green.length = var->blue.length = 8;
 371                 break;
 372         default:
 373                 dev_err(dev, "color depth %d not supported\n",
 374                                         var->bits_per_pixel);
 375                 return -EINVAL;
 376         }
 377
 378         return 0;
 379 }
 380
 381 /**
 382  *      atmel_lcdfb_set_par - Alters the hardware state.
 383  *      @info: frame buffer structure that represents a single frame buffer
 384  *
 385  *      Using the fb_var_screeninfo in fb_info we set the resolution
 386  *      of the this particular framebuffer. This function alters the
 387  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
 388  *      not alter var in fb_info since we are using that data. This
 389  *      means we depend on the data in var inside fb_info to be
 390  *      supported by the hardware.  atmel_lcdfb_check_var is always called
 391  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
 392  *      change the resolution you don't need this function.
 393  *
 394  */
 395 static int atmel_lcdfb_set_par(struct fb_info *info)
 396 {
 397         struct atmel_lcdfb_info *sinfo = info->par;
 398         unsigned long hozval_linesz;
 399         unsigned long value;
 400         unsigned long clk_value_khz;
 401         unsigned long bits_per_line;
 402
 403         dev_dbg(info->device, "%s:\n", __func__);
 404         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
 405                  info->var.xres, info->var.yres,
 406                  info->var.xres_virtual, info->var.yres_virtual);
 407
 408         /* Turn off the LCD controller and the DMA controller */
 409         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON, sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
 410
 411         /* Wait for the LCDC core to become idle */
 412         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 413                 msleep(10);
 414
 415         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
 416
 417         if (info->var.bits_per_pixel == 1)
 418                 info->fix.visual = FB_VISUAL_MONO01;
 419         else if (info->var.bits_per_pixel <= 8)
 420                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 421         else
 422                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 423
 424         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
 425         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
 426
 427         /* Re-initialize the DMA engine... */
 428         dev_dbg(info->device, "  * update DMA engine\n");
 429         atmel_lcdfb_update_dma(info, &info->var);
 430
 431         /* ...set frame size and burst length = 8 words (?) */
 432         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
 433         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 434         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
 435
 436         /* Now, the LCDC core... */
 437
 438         /* Set pixel clock */
 439         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 440
 441         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
 442
 443         value = (value / 2) - 1;
 444         dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n", value);
 445
 446         if (value <= 0) {
 447                 dev_notice(info->device, "Bypassing pixel clock divider\n");
 448                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 449         } else {
 450                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, value << ATMEL_LCDC_CLKVAL_OFFSET);
 451                 info->var.pixclock = KHZ2PICOS(clk_value_khz / (2 * (value + 1)));
 452                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
 453                                         PICOS2KHZ(info->var.pixclock));
 454         }
 455
 456
 457         /* Initialize control register 2 */
 458         value = sinfo->default_lcdcon2;
 459
 460         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
 461                 value |= ATMEL_LCDC_INVLINE_INVERTED;
 462         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
 463                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
 464
 465         switch (info->var.bits_per_pixel) {
 466                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
 467                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
 468                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
 469                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
 470                 case 15: /* fall through */
 471                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
 472                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
 473                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
 474                 default: BUG(); break;
 475         }
 476         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
 477         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
 478
 479         /* Vertical timing */
 480         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 481         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
 482         value |= info->var.lower_margin;
 483         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
 484         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
 485
 486         /* Horizontal timing */
 487         value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 488         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 489         value |= (info->var.left_margin - 1);
 490         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
 491         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
 492
 493         /* Horizontal value (aka line size) */
 494         hozval_linesz = compute_hozval(info->var.xres,
 495                                         lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2));
 496
 497         /* Display size */
 498         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 499         value |= info->var.yres - 1;
 500         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
 501         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
 502
 503         /* FIFO Threshold: Use formula from data sheet */
 504         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 505         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
 506
 507         /* Toggle LCD_MODE every frame */
 508         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
 509
 510         /* Disable all interrupts */
 511         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
 512
 513         /* ...wait for DMA engine to become idle... */
 514         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 515                 msleep(10);
 516
 517         dev_dbg(info->device, "  * re-enable DMA engine\n");
 518         /* ...and enable it with updated configuration */
 519         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon);
 520
 521         dev_dbg(info->device, "  * re-enable LCDC core\n");
 522         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 523                 (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET) | ATMEL_LCDC_PWR);
 524
 525         dev_dbg(info->device, "  * DONE\n");
 526
 527         return 0;
 528 }
 529
 530 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
 531 {
 532         chan &= 0xffff;
 533         chan >>= 16 - bf->length;
 534         return chan << bf->offset;
 535 }
 536
 537 /**
 538  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
 539  *      @regno: Which register in the CLUT we are programming
 540  *      @red: The red value which can be up to 16 bits wide
 541  *      @green: The green value which can be up to 16 bits wide
 542  *      @blue:  The blue value which can be up to 16 bits wide.
 543  *      @transp: If supported the alpha value which can be up to 16 bits wide.
 544  *      @info: frame buffer info structure
 545  *
 546  *      Set a single color register. The values supplied have a 16 bit
 547  *      magnitude which needs to be scaled in this function for the hardware.
 548  *      Things to take into consideration are how many color registers, if
 549  *      any, are supported with the current color visual. With truecolor mode
 550  *      no color palettes are supported. Here a psuedo palette is created
 551  *      which we store the value in pseudo_palette in struct fb_info. For
 552  *      pseudocolor mode we have a limited color palette. To deal with this
 553  *      we can program what color is displayed for a particular pixel value.
 554  *      DirectColor is similar in that we can program each color field. If
 555  *      we have a static colormap we don't need to implement this function.
 556  *
 557  *      Returns negative errno on error, or zero on success. In an
 558  *      ideal world, this would have been the case, but as it turns
 559  *      out, the other drivers return 1 on failure, so that's what
 560  *      we're going to do.
 561  */
 562 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
 563                              unsigned int green, unsigned int blue,
 564                              unsigned int transp, struct fb_info *info)
 565 {
 566         struct atmel_lcdfb_info *sinfo = info->par;
 567         unsigned int val;
 568         u32 *pal;
 569         int ret = 1;
 570
 571         if (info->var.grayscale)
 572                 red = green = blue = (19595 * red + 38470 * green
 573                                       + 7471 * blue) >> 16;
 574
 575         switch (info->fix.visual) {
 576         case FB_VISUAL_TRUECOLOR:
 577                 if (regno < 16) {
 578                         pal = info->pseudo_palette;
 579
 580                         val  = chan_to_field(red, &info->var.red);
 581                         val |= chan_to_field(green, &info->var.green);
 582                         val |= chan_to_field(blue, &info->var.blue);
 583
 584                         pal[regno] = val;
 585                         ret = 0;
 586                 }
 587                 break;
 588
 589         case FB_VISUAL_PSEUDOCOLOR:
 590                 if (regno < 256) {
 591                         val  = ((red   >> 11) & 0x001f);
 592                         val |= ((green >>  6) & 0x03e0);
 593                         val |= ((blue  >>  1) & 0x7c00);
 594
 595                         /*
 596                          * TODO: intensity bit. Maybe something like
 597                          *   ~(red[10] ^ green[10] ^ blue[10]) & 1
 598                          */
 599
 600                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 601                         ret = 0;
 602                 }
 603                 break;
 604
 605         case FB_VISUAL_MONO01:
 606                 if (regno < 2) {
 607                         val = (regno == 0) ? 0x00 : 0x1F;
 608                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 609                         ret = 0;
 610                 }
 611                 break;
 612
 613         }
 614
 615         return ret;
 616 }
 617
 618 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
 619                                struct fb_info *info)
 620 {
 621         dev_dbg(info->device, "%s\n", __func__);
 622
 623         atmel_lcdfb_update_dma(info, var);
 624
 625         return 0;
 626 }
 627
 628 static struct fb_ops atmel_lcdfb_ops = {
 629         .owner          = THIS_MODULE,
 630         .fb_check_var   = atmel_lcdfb_check_var,
 631         .fb_set_par     = atmel_lcdfb_set_par,
 632         .fb_setcolreg   = atmel_lcdfb_setcolreg,
 633         .fb_pan_display = atmel_lcdfb_pan_display,
 634         .fb_fillrect    = cfb_fillrect,
 635         .fb_copyarea    = cfb_copyarea,
 636         .fb_imageblit   = cfb_imageblit,
 637 };
 638
 639 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
 640 {
 641         struct fb_info *info = dev_id;
 642         struct atmel_lcdfb_info *sinfo = info->par;
 643         u32 status;
 644
 645         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
 646         lcdc_writel(sinfo, ATMEL_LCDC_IDR, status);
 647         return IRQ_HANDLED;
 648 }
 649
 650 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
 651 {
 652         struct fb_info *info = sinfo->info;
 653         int ret = 0;
 654
 655         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
 656
 657         dev_info(info->device,
 658                "%luKiB frame buffer at %08lx (mapped at %p)\n",
 659                (unsigned long)info->fix.smem_len / 1024,
 660                (unsigned long)info->fix.smem_start,
 661                info->screen_base);
 662
 663         /* Allocate colormap */
 664         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 665         if (ret < 0)
 666                 dev_err(info->device, "Alloc color map failed\n");
 667
 668         return ret;
 669 }
 670
 671 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
 672 {
 673         if (sinfo->bus_clk)
 674                 clk_enable(sinfo->bus_clk);
 675         clk_enable(sinfo->lcdc_clk);
 676 }
 677
 678 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
 679 {
 680         if (sinfo->bus_clk)
 681                 clk_disable(sinfo->bus_clk);
 682         clk_disable(sinfo->lcdc_clk);
 683 }
 684
 685
 686 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
 687 {
 688         struct device *dev = &pdev->dev;
 689         struct fb_info *info;
 690         struct atmel_lcdfb_info *sinfo;
 691         struct atmel_lcdfb_info *pdata_sinfo;
 692         struct resource *regs = NULL;
 693         struct resource *map = NULL;
 694         int ret;
 695
 696         dev_dbg(dev, "%s BEGIN\n", __func__);
 697
 698         ret = -ENOMEM;
 699         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
 700         if (!info) {
 701                 dev_err(dev, "cannot allocate memory\n");
 702                 goto out;
 703         }
 704
 705         sinfo = info->par;
 706
 707         if (dev->platform_data) {
 708                 pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data;
 709                 sinfo->default_bpp = pdata_sinfo->default_bpp;
 710                 sinfo->default_dmacon = pdata_sinfo->default_dmacon;
 711                 sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2;
 712                 sinfo->default_monspecs = pdata_sinfo->default_monspecs;
 713                 sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
 714                 sinfo->guard_time = pdata_sinfo->guard_time;
 715                 sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
 716                 sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
 717         } else {
 718                 dev_err(dev, "cannot get default configuration\n");
 719                 goto free_info;
 720         }
 721         sinfo->info = info;
 722         sinfo->pdev = pdev;
 723
 724         strcpy(info->fix.id, sinfo->pdev->name);
 725         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
 726         info->pseudo_palette = sinfo->pseudo_palette;
 727         info->fbops = &atmel_lcdfb_ops;
 728
 729         memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs));
 730         info->fix = atmel_lcdfb_fix;
 731
 732         /* Enable LCDC Clocks */
 733         if (cpu_is_at91sam9261() || cpu_is_at32ap7000()) {
 734                 sinfo->bus_clk = clk_get(dev, "hck1");
 735                 if (IS_ERR(sinfo->bus_clk)) {
 736                         ret = PTR_ERR(sinfo->bus_clk);
 737                         goto free_info;
 738                 }
 739         }
 740         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
 741         if (IS_ERR(sinfo->lcdc_clk)) {
 742                 ret = PTR_ERR(sinfo->lcdc_clk);
 743                 goto put_bus_clk;
 744         }
 745         atmel_lcdfb_start_clock(sinfo);
 746
 747         ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
 748                         info->monspecs.modedb_len, info->monspecs.modedb,
 749                         sinfo->default_bpp);
 750         if (!ret) {
 751                 dev_err(dev, "no suitable video mode found\n");
 752                 goto stop_clk;
 753         }
 754
 755
 756         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 757         if (!regs) {
 758                 dev_err(dev, "resources unusable\n");
 759                 ret = -ENXIO;
 760                 goto stop_clk;
 761         }
 762
 763         sinfo->irq_base = platform_get_irq(pdev, 0);
 764         if (sinfo->irq_base < 0) {
 765                 dev_err(dev, "unable to get irq\n");
 766                 ret = sinfo->irq_base;
 767                 goto stop_clk;
 768         }
 769
 770         /* Initialize video memory */
 771         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 772         if (map) {
 773                 /* use a pre-allocated memory buffer */
 774                 info->fix.smem_start = map->start;
 775                 info->fix.smem_len = map->end - map->start + 1;
 776                 if (!request_mem_region(info->fix.smem_start,
 777                                         info->fix.smem_len, pdev->name)) {
 778                         ret = -EBUSY;
 779                         goto stop_clk;
 780                 }
 781
 782                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 783                 if (!info->screen_base)
 784                         goto release_intmem;
 785
 786                 /*
 787                  * Don't clear the framebuffer -- someone may have set
 788                  * up a splash image.
 789                  */
 790         } else {
 791                 /* alocate memory buffer */
 792                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
 793                 if (ret < 0) {
 794                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
 795                         goto stop_clk;
 796                 }
 797         }
 798
 799         /* LCDC registers */
 800         info->fix.mmio_start = regs->start;
 801         info->fix.mmio_len = regs->end - regs->start + 1;
 802
 803         if (!request_mem_region(info->fix.mmio_start,
 804                                 info->fix.mmio_len, pdev->name)) {
 805                 ret = -EBUSY;
 806                 goto free_fb;
 807         }
 808
 809         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
 810         if (!sinfo->mmio) {
 811                 dev_err(dev, "cannot map LCDC registers\n");
 812                 goto release_mem;
 813         }
 814
 815         /* Initialize PWM for contrast or backlight ("off") */
 816         init_contrast(sinfo);
 817
 818         /* interrupt */
 819         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
 820         if (ret) {
 821                 dev_err(dev, "request_irq failed: %d\n", ret);
 822                 goto unmap_mmio;
 823         }
 824
 825         ret = atmel_lcdfb_init_fbinfo(sinfo);
 826         if (ret < 0) {
 827                 dev_err(dev, "init fbinfo failed: %d\n", ret);
 828                 goto unregister_irqs;
 829         }
 830
 831         /*
 832          * This makes sure that our colour bitfield
 833          * descriptors are correctly initialised.
 834          */
 835         atmel_lcdfb_check_var(&info->var, info);
 836
 837         ret = fb_set_var(info, &info->var);
 838         if (ret) {
 839                 dev_warn(dev, "unable to set display parameters\n");
 840                 goto free_cmap;
 841         }
 842
 843         dev_set_drvdata(dev, info);
 844
 845         /*
 846          * Tell the world that we're ready to go
 847          */
 848         ret = register_framebuffer(info);
 849         if (ret < 0) {
 850                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
 851                 goto free_cmap;
 852         }
 853
 854         /* Power up the LCDC screen */
 855         if (sinfo->atmel_lcdfb_power_control)
 856                 sinfo->atmel_lcdfb_power_control(1);
 857
 858         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %lu\n",
 859                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
 860
 861         return 0;
 862
 863
 864 free_cmap:
 865         fb_dealloc_cmap(&info->cmap);
 866 unregister_irqs:
 867         free_irq(sinfo->irq_base, info);
 868 unmap_mmio:
 869         exit_backlight(sinfo);
 870         iounmap(sinfo->mmio);
 871 release_mem:
 872         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
 873 free_fb:
 874         if (map)
 875                 iounmap(info->screen_base);
 876         else
 877                 atmel_lcdfb_free_video_memory(sinfo);
 878
 879 release_intmem:
 880         if (map)
 881                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
 882 stop_clk:
 883         atmel_lcdfb_stop_clock(sinfo);
 884         clk_put(sinfo->lcdc_clk);
 885 put_bus_clk:
 886         if (sinfo->bus_clk)
 887                 clk_put(sinfo->bus_clk);
 888 free_info:
 889         framebuffer_release(info);
 890 out:
 891         dev_dbg(dev, "%s FAILED\n", __func__);
 892         return ret;
 893 }
 894
 895 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
 896 {
 897         struct device *dev = &pdev->dev;
 898         struct fb_info *info = dev_get_drvdata(dev);
 899         struct atmel_lcdfb_info *sinfo = info->par;
 900
 901         if (!sinfo)
 902                 return 0;
 903
 904         exit_backlight(sinfo);
 905         if (sinfo->atmel_lcdfb_power_control)
 906                 sinfo->atmel_lcdfb_power_control(0);
 907         unregister_framebuffer(info);
 908         atmel_lcdfb_stop_clock(sinfo);
 909         clk_put(sinfo->lcdc_clk);
 910         if (sinfo->bus_clk)
 911                 clk_put(sinfo->bus_clk);
 912         fb_dealloc_cmap(&info->cmap);
 913         free_irq(sinfo->irq_base, info);
 914         iounmap(sinfo->mmio);
 915         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
 916         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
 917                 iounmap(info->screen_base);
 918                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
 919         } else {
 920                 atmel_lcdfb_free_video_memory(sinfo);
 921         }
 922
 923         dev_set_drvdata(dev, NULL);
 924         framebuffer_release(info);
 925
 926         return 0;
 927 }
 928
 929 #ifdef CONFIG_PM
 930
 931 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
 932 {
 933         struct fb_info *info = platform_get_drvdata(pdev);
 934         struct atmel_lcdfb_info *sinfo = info->par;
 935
 936         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 937         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
 938         if (sinfo->atmel_lcdfb_power_control)
 939                 sinfo->atmel_lcdfb_power_control(0);
 940         atmel_lcdfb_stop_clock(sinfo);
 941         return 0;
 942 }
 943
 944 static int atmel_lcdfb_resume(struct platform_device *pdev)
 945 {
 946         struct fb_info *info = platform_get_drvdata(pdev);
 947         struct atmel_lcdfb_info *sinfo = info->par;
 948
 949         atmel_lcdfb_start_clock(sinfo);
 950         if (sinfo->atmel_lcdfb_power_control)
 951                 sinfo->atmel_lcdfb_power_control(1);
 952         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
 953         return 0;
 954 }
 955
 956 #else
 957 #define atmel_lcdfb_suspend     NULL
 958 #define atmel_lcdfb_resume      NULL
 959 #endif
 960
 961 static struct platform_driver atmel_lcdfb_driver = {
 962         .remove         = __exit_p(atmel_lcdfb_remove),
 963         .suspend        = atmel_lcdfb_suspend,
 964         .resume         = atmel_lcdfb_resume,
 965
 966         .driver         = {
 967                 .name   = "atmel_lcdfb",
 968                 .owner  = THIS_MODULE,
 969         },
 970 };
 971
 972 static int __init atmel_lcdfb_init(void)
 973 {
 974         return platform_driver_probe(&atmel_lcdfb_driver, atmel_lcdfb_probe);
 975 }
 976
 977 static void __exit atmel_lcdfb_exit(void)
 978 {
 979         platform_driver_unregister(&atmel_lcdfb_driver);
 980 }
 981
 982 module_init(atmel_lcdfb_init);
 983 module_exit(atmel_lcdfb_exit);
 984
 985 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
 986 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
 987 MODULE_LICENSE("GPL");