linux/drivers/video/atmel_lcdfb.c
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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#include <linux/gfp.h>
  21#include <linux/module.h>
  22#include <linux/platform_data/atmel.h>
  23
  24#include <mach/cpu.h>
  25#include <asm/gpio.h>
  26
  27#include <video/atmel_lcdc.h>
  28
  29#define lcdc_readl(sinfo, reg)          __raw_readl((sinfo)->mmio+(reg))
  30#define lcdc_writel(sinfo, reg, val)    __raw_writel((val), (sinfo)->mmio+(reg))
  31
  32/* configurable parameters */
  33#define ATMEL_LCDC_CVAL_DEFAULT         0xc8
  34#define ATMEL_LCDC_DMA_BURST_LEN        8       /* words */
  35#define ATMEL_LCDC_FIFO_SIZE            512     /* words */
  36
  37struct atmel_lcdfb_config {
  38        bool have_alt_pixclock;
  39        bool have_hozval;
  40        bool have_intensity_bit;
  41};
  42
  43static struct atmel_lcdfb_config at91sam9261_config = {
  44        .have_hozval            = true,
  45        .have_intensity_bit     = true,
  46};
  47
  48static struct atmel_lcdfb_config at91sam9263_config = {
  49        .have_intensity_bit     = true,
  50};
  51
  52static struct atmel_lcdfb_config at91sam9g10_config = {
  53        .have_hozval            = true,
  54};
  55
  56static struct atmel_lcdfb_config at91sam9g45_config = {
  57        .have_alt_pixclock      = true,
  58};
  59
  60static struct atmel_lcdfb_config at91sam9g45es_config = {
  61};
  62
  63static struct atmel_lcdfb_config at91sam9rl_config = {
  64        .have_intensity_bit     = true,
  65};
  66
  67static struct atmel_lcdfb_config at32ap_config = {
  68        .have_hozval            = true,
  69};
  70
  71static const struct platform_device_id atmel_lcdfb_devtypes[] = {
  72        {
  73                .name = "at91sam9261-lcdfb",
  74                .driver_data = (unsigned long)&at91sam9261_config,
  75        }, {
  76                .name = "at91sam9263-lcdfb",
  77                .driver_data = (unsigned long)&at91sam9263_config,
  78        }, {
  79                .name = "at91sam9g10-lcdfb",
  80                .driver_data = (unsigned long)&at91sam9g10_config,
  81        }, {
  82                .name = "at91sam9g45-lcdfb",
  83                .driver_data = (unsigned long)&at91sam9g45_config,
  84        }, {
  85                .name = "at91sam9g45es-lcdfb",
  86                .driver_data = (unsigned long)&at91sam9g45es_config,
  87        }, {
  88                .name = "at91sam9rl-lcdfb",
  89                .driver_data = (unsigned long)&at91sam9rl_config,
  90        }, {
  91                .name = "at32ap-lcdfb",
  92                .driver_data = (unsigned long)&at32ap_config,
  93        }, {
  94                /* terminator */
  95        }
  96};
  97
  98static struct atmel_lcdfb_config *
  99atmel_lcdfb_get_config(struct platform_device *pdev)
 100{
 101        unsigned long data;
 102
 103        data = platform_get_device_id(pdev)->driver_data;
 104
 105        return (struct atmel_lcdfb_config *)data;
 106}
 107
 108#if defined(CONFIG_ARCH_AT91)
 109#define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
 110                                         | FBINFO_PARTIAL_PAN_OK \
 111                                         | FBINFO_HWACCEL_YPAN)
 112
 113static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
 114                                        struct fb_var_screeninfo *var,
 115                                        struct fb_info *info)
 116{
 117
 118}
 119#elif defined(CONFIG_AVR32)
 120#define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
 121                                        | FBINFO_PARTIAL_PAN_OK \
 122                                        | FBINFO_HWACCEL_XPAN \
 123                                        | FBINFO_HWACCEL_YPAN)
 124
 125static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
 126                                     struct fb_var_screeninfo *var,
 127                                     struct fb_info *info)
 128{
 129        u32 dma2dcfg;
 130        u32 pixeloff;
 131
 132        pixeloff = (var->xoffset * info->var.bits_per_pixel) & 0x1f;
 133
 134        dma2dcfg = (info->var.xres_virtual - info->var.xres)
 135                 * info->var.bits_per_pixel / 8;
 136        dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
 137        lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
 138
 139        /* Update configuration */
 140        lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
 141                    lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
 142                    | ATMEL_LCDC_DMAUPDT);
 143}
 144#endif
 145
 146static u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
 147                | ATMEL_LCDC_POL_POSITIVE
 148                | ATMEL_LCDC_ENA_PWMENABLE;
 149
 150#ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
 151
 152/* some bl->props field just changed */
 153static int atmel_bl_update_status(struct backlight_device *bl)
 154{
 155        struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 156        int                     power = sinfo->bl_power;
 157        int                     brightness = bl->props.brightness;
 158
 159        /* REVISIT there may be a meaningful difference between
 160         * fb_blank and power ... there seem to be some cases
 161         * this doesn't handle correctly.
 162         */
 163        if (bl->props.fb_blank != sinfo->bl_power)
 164                power = bl->props.fb_blank;
 165        else if (bl->props.power != sinfo->bl_power)
 166                power = bl->props.power;
 167
 168        if (brightness < 0 && power == FB_BLANK_UNBLANK)
 169                brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 170        else if (power != FB_BLANK_UNBLANK)
 171                brightness = 0;
 172
 173        lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
 174        if (contrast_ctr & ATMEL_LCDC_POL_POSITIVE)
 175                lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
 176                        brightness ? contrast_ctr : 0);
 177        else
 178                lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 179
 180        bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
 181
 182        return 0;
 183}
 184
 185static int atmel_bl_get_brightness(struct backlight_device *bl)
 186{
 187        struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
 188
 189        return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
 190}
 191
 192static const struct backlight_ops atmel_lcdc_bl_ops = {
 193        .update_status = atmel_bl_update_status,
 194        .get_brightness = atmel_bl_get_brightness,
 195};
 196
 197static void init_backlight(struct atmel_lcdfb_info *sinfo)
 198{
 199        struct backlight_properties props;
 200        struct backlight_device *bl;
 201
 202        sinfo->bl_power = FB_BLANK_UNBLANK;
 203
 204        if (sinfo->backlight)
 205                return;
 206
 207        memset(&props, 0, sizeof(struct backlight_properties));
 208        props.type = BACKLIGHT_RAW;
 209        props.max_brightness = 0xff;
 210        bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo,
 211                                       &atmel_lcdc_bl_ops, &props);
 212        if (IS_ERR(bl)) {
 213                dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
 214                                PTR_ERR(bl));
 215                return;
 216        }
 217        sinfo->backlight = bl;
 218
 219        bl->props.power = FB_BLANK_UNBLANK;
 220        bl->props.fb_blank = FB_BLANK_UNBLANK;
 221        bl->props.brightness = atmel_bl_get_brightness(bl);
 222}
 223
 224static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 225{
 226        if (!sinfo->backlight)
 227                return;
 228
 229        if (sinfo->backlight->ops) {
 230                sinfo->backlight->props.power = FB_BLANK_POWERDOWN;
 231                sinfo->backlight->ops->update_status(sinfo->backlight);
 232        }
 233        backlight_device_unregister(sinfo->backlight);
 234}
 235
 236#else
 237
 238static void init_backlight(struct atmel_lcdfb_info *sinfo)
 239{
 240        dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
 241}
 242
 243static void exit_backlight(struct atmel_lcdfb_info *sinfo)
 244{
 245}
 246
 247#endif
 248
 249static void init_contrast(struct atmel_lcdfb_info *sinfo)
 250{
 251        /* contrast pwm can be 'inverted' */
 252        if (sinfo->lcdcon_pol_negative)
 253                        contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
 254
 255        /* have some default contrast/backlight settings */
 256        lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 257        lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 258
 259        if (sinfo->lcdcon_is_backlight)
 260                init_backlight(sinfo);
 261}
 262
 263
 264static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
 265        .type           = FB_TYPE_PACKED_PIXELS,
 266        .visual         = FB_VISUAL_TRUECOLOR,
 267        .xpanstep       = 0,
 268        .ypanstep       = 1,
 269        .ywrapstep      = 0,
 270        .accel          = FB_ACCEL_NONE,
 271};
 272
 273static unsigned long compute_hozval(struct atmel_lcdfb_info *sinfo,
 274                                                        unsigned long xres)
 275{
 276        unsigned long lcdcon2;
 277        unsigned long value;
 278
 279        if (!sinfo->config->have_hozval)
 280                return xres;
 281
 282        lcdcon2 = lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2);
 283        value = xres;
 284        if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
 285                /* STN display */
 286                if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
 287                        value *= 3;
 288                }
 289                if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
 290                   || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
 291                      && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
 292                        value = DIV_ROUND_UP(value, 4);
 293                else
 294                        value = DIV_ROUND_UP(value, 8);
 295        }
 296
 297        return value;
 298}
 299
 300static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
 301{
 302        /* Turn off the LCD controller and the DMA controller */
 303        lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 304                        sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
 305
 306        /* Wait for the LCDC core to become idle */
 307        while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 308                msleep(10);
 309
 310        lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
 311}
 312
 313static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
 314{
 315        atmel_lcdfb_stop_nowait(sinfo);
 316
 317        /* Wait for DMA engine to become idle... */
 318        while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 319                msleep(10);
 320}
 321
 322static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
 323{
 324        lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon);
 325        lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
 326                (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
 327                | ATMEL_LCDC_PWR);
 328}
 329
 330static void atmel_lcdfb_update_dma(struct fb_info *info,
 331                               struct fb_var_screeninfo *var)
 332{
 333        struct atmel_lcdfb_info *sinfo = info->par;
 334        struct fb_fix_screeninfo *fix = &info->fix;
 335        unsigned long dma_addr;
 336
 337        dma_addr = (fix->smem_start + var->yoffset * fix->line_length
 338                    + var->xoffset * info->var.bits_per_pixel / 8);
 339
 340        dma_addr &= ~3UL;
 341
 342        /* Set framebuffer DMA base address and pixel offset */
 343        lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
 344
 345        atmel_lcdfb_update_dma2d(sinfo, var, info);
 346}
 347
 348static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
 349{
 350        struct fb_info *info = sinfo->info;
 351
 352        dma_free_writecombine(info->device, info->fix.smem_len,
 353                                info->screen_base, info->fix.smem_start);
 354}
 355
 356/**
 357 *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
 358 *      @sinfo: the frame buffer to allocate memory for
 359 *      
 360 *      This function is called only from the atmel_lcdfb_probe()
 361 *      so no locking by fb_info->mm_lock around smem_len setting is needed.
 362 */
 363static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
 364{
 365        struct fb_info *info = sinfo->info;
 366        struct fb_var_screeninfo *var = &info->var;
 367        unsigned int smem_len;
 368
 369        smem_len = (var->xres_virtual * var->yres_virtual
 370                    * ((var->bits_per_pixel + 7) / 8));
 371        info->fix.smem_len = max(smem_len, sinfo->smem_len);
 372
 373        info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
 374                                        (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
 375
 376        if (!info->screen_base) {
 377                return -ENOMEM;
 378        }
 379
 380        memset(info->screen_base, 0, info->fix.smem_len);
 381
 382        return 0;
 383}
 384
 385static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
 386                                                     struct fb_info *info)
 387{
 388        struct fb_videomode varfbmode;
 389        const struct fb_videomode *fbmode = NULL;
 390
 391        fb_var_to_videomode(&varfbmode, var);
 392        fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
 393        if (fbmode)
 394                fb_videomode_to_var(var, fbmode);
 395        return fbmode;
 396}
 397
 398
 399/**
 400 *      atmel_lcdfb_check_var - Validates a var passed in.
 401 *      @var: frame buffer variable screen structure
 402 *      @info: frame buffer structure that represents a single frame buffer
 403 *
 404 *      Checks to see if the hardware supports the state requested by
 405 *      var passed in. This function does not alter the hardware
 406 *      state!!!  This means the data stored in struct fb_info and
 407 *      struct atmel_lcdfb_info do not change. This includes the var
 408 *      inside of struct fb_info.  Do NOT change these. This function
 409 *      can be called on its own if we intent to only test a mode and
 410 *      not actually set it. The stuff in modedb.c is a example of
 411 *      this. If the var passed in is slightly off by what the
 412 *      hardware can support then we alter the var PASSED in to what
 413 *      we can do. If the hardware doesn't support mode change a
 414 *      -EINVAL will be returned by the upper layers. You don't need
 415 *      to implement this function then. If you hardware doesn't
 416 *      support changing the resolution then this function is not
 417 *      needed. In this case the driver would just provide a var that
 418 *      represents the static state the screen is in.
 419 *
 420 *      Returns negative errno on error, or zero on success.
 421 */
 422static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
 423                             struct fb_info *info)
 424{
 425        struct device *dev = info->device;
 426        struct atmel_lcdfb_info *sinfo = info->par;
 427        unsigned long clk_value_khz;
 428
 429        clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 430
 431        dev_dbg(dev, "%s:\n", __func__);
 432
 433        if (!(var->pixclock && var->bits_per_pixel)) {
 434                /* choose a suitable mode if possible */
 435                if (!atmel_lcdfb_choose_mode(var, info)) {
 436                        dev_err(dev, "needed value not specified\n");
 437                        return -EINVAL;
 438                }
 439        }
 440
 441        dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
 442        dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
 443        dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
 444        dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
 445
 446        if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
 447                dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
 448                return -EINVAL;
 449        }
 450
 451        /* Do not allow to have real resoulution larger than virtual */
 452        if (var->xres > var->xres_virtual)
 453                var->xres_virtual = var->xres;
 454
 455        if (var->yres > var->yres_virtual)
 456                var->yres_virtual = var->yres;
 457
 458        /* Force same alignment for each line */
 459        var->xres = (var->xres + 3) & ~3UL;
 460        var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
 461
 462        var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
 463        var->transp.msb_right = 0;
 464        var->transp.offset = var->transp.length = 0;
 465        var->xoffset = var->yoffset = 0;
 466
 467        if (info->fix.smem_len) {
 468                unsigned int smem_len = (var->xres_virtual * var->yres_virtual
 469                                         * ((var->bits_per_pixel + 7) / 8));
 470                if (smem_len > info->fix.smem_len) {
 471                        dev_err(dev, "Frame buffer is too small (%u) for screen size (need at least %u)\n",
 472                                info->fix.smem_len, smem_len);
 473                        return -EINVAL;
 474                }
 475        }
 476
 477        /* Saturate vertical and horizontal timings at maximum values */
 478        var->vsync_len = min_t(u32, var->vsync_len,
 479                        (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
 480        var->upper_margin = min_t(u32, var->upper_margin,
 481                        ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
 482        var->lower_margin = min_t(u32, var->lower_margin,
 483                        ATMEL_LCDC_VFP);
 484        var->right_margin = min_t(u32, var->right_margin,
 485                        (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
 486        var->hsync_len = min_t(u32, var->hsync_len,
 487                        (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
 488        var->left_margin = min_t(u32, var->left_margin,
 489                        ATMEL_LCDC_HBP + 1);
 490
 491        /* Some parameters can't be zero */
 492        var->vsync_len = max_t(u32, var->vsync_len, 1);
 493        var->right_margin = max_t(u32, var->right_margin, 1);
 494        var->hsync_len = max_t(u32, var->hsync_len, 1);
 495        var->left_margin = max_t(u32, var->left_margin, 1);
 496
 497        switch (var->bits_per_pixel) {
 498        case 1:
 499        case 2:
 500        case 4:
 501        case 8:
 502                var->red.offset = var->green.offset = var->blue.offset = 0;
 503                var->red.length = var->green.length = var->blue.length
 504                        = var->bits_per_pixel;
 505                break;
 506        case 16:
 507                /* Older SOCs use IBGR:555 rather than BGR:565. */
 508                if (sinfo->config->have_intensity_bit)
 509                        var->green.length = 5;
 510                else
 511                        var->green.length = 6;
 512
 513                if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 514                        /* RGB:5X5 mode */
 515                        var->red.offset = var->green.length + 5;
 516                        var->blue.offset = 0;
 517                } else {
 518                        /* BGR:5X5 mode */
 519                        var->red.offset = 0;
 520                        var->blue.offset = var->green.length + 5;
 521                }
 522                var->green.offset = 5;
 523                var->red.length = var->blue.length = 5;
 524                break;
 525        case 32:
 526                var->transp.offset = 24;
 527                var->transp.length = 8;
 528                /* fall through */
 529        case 24:
 530                if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
 531                        /* RGB:888 mode */
 532                        var->red.offset = 16;
 533                        var->blue.offset = 0;
 534                } else {
 535                        /* BGR:888 mode */
 536                        var->red.offset = 0;
 537                        var->blue.offset = 16;
 538                }
 539                var->green.offset = 8;
 540                var->red.length = var->green.length = var->blue.length = 8;
 541                break;
 542        default:
 543                dev_err(dev, "color depth %d not supported\n",
 544                                        var->bits_per_pixel);
 545                return -EINVAL;
 546        }
 547
 548        return 0;
 549}
 550
 551/*
 552 * LCD reset sequence
 553 */
 554static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
 555{
 556        might_sleep();
 557
 558        atmel_lcdfb_stop(sinfo);
 559        atmel_lcdfb_start(sinfo);
 560}
 561
 562/**
 563 *      atmel_lcdfb_set_par - Alters the hardware state.
 564 *      @info: frame buffer structure that represents a single frame buffer
 565 *
 566 *      Using the fb_var_screeninfo in fb_info we set the resolution
 567 *      of the this particular framebuffer. This function alters the
 568 *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
 569 *      not alter var in fb_info since we are using that data. This
 570 *      means we depend on the data in var inside fb_info to be
 571 *      supported by the hardware.  atmel_lcdfb_check_var is always called
 572 *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
 573 *      change the resolution you don't need this function.
 574 *
 575 */
 576static int atmel_lcdfb_set_par(struct fb_info *info)
 577{
 578        struct atmel_lcdfb_info *sinfo = info->par;
 579        unsigned long hozval_linesz;
 580        unsigned long value;
 581        unsigned long clk_value_khz;
 582        unsigned long bits_per_line;
 583        unsigned long pix_factor = 2;
 584
 585        might_sleep();
 586
 587        dev_dbg(info->device, "%s:\n", __func__);
 588        dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
 589                 info->var.xres, info->var.yres,
 590                 info->var.xres_virtual, info->var.yres_virtual);
 591
 592        atmel_lcdfb_stop_nowait(sinfo);
 593
 594        if (info->var.bits_per_pixel == 1)
 595                info->fix.visual = FB_VISUAL_MONO01;
 596        else if (info->var.bits_per_pixel <= 8)
 597                info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 598        else
 599                info->fix.visual = FB_VISUAL_TRUECOLOR;
 600
 601        bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
 602        info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
 603
 604        /* Re-initialize the DMA engine... */
 605        dev_dbg(info->device, "  * update DMA engine\n");
 606        atmel_lcdfb_update_dma(info, &info->var);
 607
 608        /* ...set frame size and burst length = 8 words (?) */
 609        value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
 610        value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 611        lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
 612
 613        /* Now, the LCDC core... */
 614
 615        /* Set pixel clock */
 616        if (sinfo->config->have_alt_pixclock)
 617                pix_factor = 1;
 618
 619        clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 620
 621        value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
 622
 623        if (value < pix_factor) {
 624                dev_notice(info->device, "Bypassing pixel clock divider\n");
 625                lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 626        } else {
 627                value = (value / pix_factor) - 1;
 628                dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
 629                                value);
 630                lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
 631                                value << ATMEL_LCDC_CLKVAL_OFFSET);
 632                info->var.pixclock =
 633                        KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1)));
 634                dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
 635                                        PICOS2KHZ(info->var.pixclock));
 636        }
 637
 638
 639        /* Initialize control register 2 */
 640        value = sinfo->default_lcdcon2;
 641
 642        if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
 643                value |= ATMEL_LCDC_INVLINE_INVERTED;
 644        if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
 645                value |= ATMEL_LCDC_INVFRAME_INVERTED;
 646
 647        switch (info->var.bits_per_pixel) {
 648                case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
 649                case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
 650                case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
 651                case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
 652                case 15: /* fall through */
 653                case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
 654                case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
 655                case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
 656                default: BUG(); break;
 657        }
 658        dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
 659        lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
 660
 661        /* Vertical timing */
 662        value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 663        value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
 664        value |= info->var.lower_margin;
 665        dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
 666        lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
 667
 668        /* Horizontal timing */
 669        value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 670        value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 671        value |= (info->var.left_margin - 1);
 672        dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
 673        lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
 674
 675        /* Horizontal value (aka line size) */
 676        hozval_linesz = compute_hozval(sinfo, info->var.xres);
 677
 678        /* Display size */
 679        value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 680        value |= info->var.yres - 1;
 681        dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
 682        lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
 683
 684        /* FIFO Threshold: Use formula from data sheet */
 685        value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 686        lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
 687
 688        /* Toggle LCD_MODE every frame */
 689        lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
 690
 691        /* Disable all interrupts */
 692        lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
 693        /* Enable FIFO & DMA errors */
 694        lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
 695
 696        /* ...wait for DMA engine to become idle... */
 697        while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
 698                msleep(10);
 699
 700        atmel_lcdfb_start(sinfo);
 701
 702        dev_dbg(info->device, "  * DONE\n");
 703
 704        return 0;
 705}
 706
 707static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
 708{
 709        chan &= 0xffff;
 710        chan >>= 16 - bf->length;
 711        return chan << bf->offset;
 712}
 713
 714/**
 715 *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
 716 *      @regno: Which register in the CLUT we are programming
 717 *      @red: The red value which can be up to 16 bits wide
 718 *      @green: The green value which can be up to 16 bits wide
 719 *      @blue:  The blue value which can be up to 16 bits wide.
 720 *      @transp: If supported the alpha value which can be up to 16 bits wide.
 721 *      @info: frame buffer info structure
 722 *
 723 *      Set a single color register. The values supplied have a 16 bit
 724 *      magnitude which needs to be scaled in this function for the hardware.
 725 *      Things to take into consideration are how many color registers, if
 726 *      any, are supported with the current color visual. With truecolor mode
 727 *      no color palettes are supported. Here a pseudo palette is created
 728 *      which we store the value in pseudo_palette in struct fb_info. For
 729 *      pseudocolor mode we have a limited color palette. To deal with this
 730 *      we can program what color is displayed for a particular pixel value.
 731 *      DirectColor is similar in that we can program each color field. If
 732 *      we have a static colormap we don't need to implement this function.
 733 *
 734 *      Returns negative errno on error, or zero on success. In an
 735 *      ideal world, this would have been the case, but as it turns
 736 *      out, the other drivers return 1 on failure, so that's what
 737 *      we're going to do.
 738 */
 739static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
 740                             unsigned int green, unsigned int blue,
 741                             unsigned int transp, struct fb_info *info)
 742{
 743        struct atmel_lcdfb_info *sinfo = info->par;
 744        unsigned int val;
 745        u32 *pal;
 746        int ret = 1;
 747
 748        if (info->var.grayscale)
 749                red = green = blue = (19595 * red + 38470 * green
 750                                      + 7471 * blue) >> 16;
 751
 752        switch (info->fix.visual) {
 753        case FB_VISUAL_TRUECOLOR:
 754                if (regno < 16) {
 755                        pal = info->pseudo_palette;
 756
 757                        val  = chan_to_field(red, &info->var.red);
 758                        val |= chan_to_field(green, &info->var.green);
 759                        val |= chan_to_field(blue, &info->var.blue);
 760
 761                        pal[regno] = val;
 762                        ret = 0;
 763                }
 764                break;
 765
 766        case FB_VISUAL_PSEUDOCOLOR:
 767                if (regno < 256) {
 768                        if (sinfo->config->have_intensity_bit) {
 769                                /* old style I+BGR:555 */
 770                                val  = ((red   >> 11) & 0x001f);
 771                                val |= ((green >>  6) & 0x03e0);
 772                                val |= ((blue  >>  1) & 0x7c00);
 773
 774                                /*
 775                                 * TODO: intensity bit. Maybe something like
 776                                 *   ~(red[10] ^ green[10] ^ blue[10]) & 1
 777                                 */
 778                        } else {
 779                                /* new style BGR:565 / RGB:565 */
 780                                if (sinfo->lcd_wiring_mode ==
 781                                    ATMEL_LCDC_WIRING_RGB) {
 782                                        val  = ((blue >> 11) & 0x001f);
 783                                        val |= ((red  >>  0) & 0xf800);
 784                                } else {
 785                                        val  = ((red  >> 11) & 0x001f);
 786                                        val |= ((blue >>  0) & 0xf800);
 787                                }
 788
 789                                val |= ((green >>  5) & 0x07e0);
 790                        }
 791
 792                        lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 793                        ret = 0;
 794                }
 795                break;
 796
 797        case FB_VISUAL_MONO01:
 798                if (regno < 2) {
 799                        val = (regno == 0) ? 0x00 : 0x1F;
 800                        lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
 801                        ret = 0;
 802                }
 803                break;
 804
 805        }
 806
 807        return ret;
 808}
 809
 810static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
 811                               struct fb_info *info)
 812{
 813        dev_dbg(info->device, "%s\n", __func__);
 814
 815        atmel_lcdfb_update_dma(info, var);
 816
 817        return 0;
 818}
 819
 820static int atmel_lcdfb_blank(int blank_mode, struct fb_info *info)
 821{
 822        struct atmel_lcdfb_info *sinfo = info->par;
 823
 824        switch (blank_mode) {
 825        case FB_BLANK_UNBLANK:
 826        case FB_BLANK_NORMAL:
 827                atmel_lcdfb_start(sinfo);
 828                break;
 829        case FB_BLANK_VSYNC_SUSPEND:
 830        case FB_BLANK_HSYNC_SUSPEND:
 831                break;
 832        case FB_BLANK_POWERDOWN:
 833                atmel_lcdfb_stop(sinfo);
 834                break;
 835        default:
 836                return -EINVAL;
 837        }
 838
 839        /* let fbcon do a soft blank for us */
 840        return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
 841}
 842
 843static struct fb_ops atmel_lcdfb_ops = {
 844        .owner          = THIS_MODULE,
 845        .fb_check_var   = atmel_lcdfb_check_var,
 846        .fb_set_par     = atmel_lcdfb_set_par,
 847        .fb_setcolreg   = atmel_lcdfb_setcolreg,
 848        .fb_blank       = atmel_lcdfb_blank,
 849        .fb_pan_display = atmel_lcdfb_pan_display,
 850        .fb_fillrect    = cfb_fillrect,
 851        .fb_copyarea    = cfb_copyarea,
 852        .fb_imageblit   = cfb_imageblit,
 853};
 854
 855static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
 856{
 857        struct fb_info *info = dev_id;
 858        struct atmel_lcdfb_info *sinfo = info->par;
 859        u32 status;
 860
 861        status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
 862        if (status & ATMEL_LCDC_UFLWI) {
 863                dev_warn(info->device, "FIFO underflow %#x\n", status);
 864                /* reset DMA and FIFO to avoid screen shifting */
 865                schedule_work(&sinfo->task);
 866        }
 867        lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
 868        return IRQ_HANDLED;
 869}
 870
 871/*
 872 * LCD controller task (to reset the LCD)
 873 */
 874static void atmel_lcdfb_task(struct work_struct *work)
 875{
 876        struct atmel_lcdfb_info *sinfo =
 877                container_of(work, struct atmel_lcdfb_info, task);
 878
 879        atmel_lcdfb_reset(sinfo);
 880}
 881
 882static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
 883{
 884        struct fb_info *info = sinfo->info;
 885        int ret = 0;
 886
 887        info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
 888
 889        dev_info(info->device,
 890               "%luKiB frame buffer at %08lx (mapped at %p)\n",
 891               (unsigned long)info->fix.smem_len / 1024,
 892               (unsigned long)info->fix.smem_start,
 893               info->screen_base);
 894
 895        /* Allocate colormap */
 896        ret = fb_alloc_cmap(&info->cmap, 256, 0);
 897        if (ret < 0)
 898                dev_err(info->device, "Alloc color map failed\n");
 899
 900        return ret;
 901}
 902
 903static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
 904{
 905        clk_enable(sinfo->bus_clk);
 906        clk_enable(sinfo->lcdc_clk);
 907}
 908
 909static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
 910{
 911        clk_disable(sinfo->bus_clk);
 912        clk_disable(sinfo->lcdc_clk);
 913}
 914
 915
 916static int __init atmel_lcdfb_probe(struct platform_device *pdev)
 917{
 918        struct device *dev = &pdev->dev;
 919        struct fb_info *info;
 920        struct atmel_lcdfb_info *sinfo;
 921        struct atmel_lcdfb_info *pdata_sinfo;
 922        struct fb_videomode fbmode;
 923        struct resource *regs = NULL;
 924        struct resource *map = NULL;
 925        int ret;
 926
 927        dev_dbg(dev, "%s BEGIN\n", __func__);
 928
 929        ret = -ENOMEM;
 930        info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
 931        if (!info) {
 932                dev_err(dev, "cannot allocate memory\n");
 933                goto out;
 934        }
 935
 936        sinfo = info->par;
 937
 938        if (dev->platform_data) {
 939                pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data;
 940                sinfo->default_bpp = pdata_sinfo->default_bpp;
 941                sinfo->default_dmacon = pdata_sinfo->default_dmacon;
 942                sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2;
 943                sinfo->default_monspecs = pdata_sinfo->default_monspecs;
 944                sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
 945                sinfo->guard_time = pdata_sinfo->guard_time;
 946                sinfo->smem_len = pdata_sinfo->smem_len;
 947                sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
 948                sinfo->lcdcon_pol_negative = pdata_sinfo->lcdcon_pol_negative;
 949                sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
 950        } else {
 951                dev_err(dev, "cannot get default configuration\n");
 952                goto free_info;
 953        }
 954        sinfo->info = info;
 955        sinfo->pdev = pdev;
 956        sinfo->config = atmel_lcdfb_get_config(pdev);
 957        if (!sinfo->config)
 958                goto free_info;
 959
 960        strcpy(info->fix.id, sinfo->pdev->name);
 961        info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
 962        info->pseudo_palette = sinfo->pseudo_palette;
 963        info->fbops = &atmel_lcdfb_ops;
 964
 965        memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs));
 966        info->fix = atmel_lcdfb_fix;
 967
 968        /* Enable LCDC Clocks */
 969        sinfo->bus_clk = clk_get(dev, "hclk");
 970        if (IS_ERR(sinfo->bus_clk)) {
 971                ret = PTR_ERR(sinfo->bus_clk);
 972                goto free_info;
 973        }
 974        sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
 975        if (IS_ERR(sinfo->lcdc_clk)) {
 976                ret = PTR_ERR(sinfo->lcdc_clk);
 977                goto put_bus_clk;
 978        }
 979        atmel_lcdfb_start_clock(sinfo);
 980
 981        ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
 982                        info->monspecs.modedb_len, info->monspecs.modedb,
 983                        sinfo->default_bpp);
 984        if (!ret) {
 985                dev_err(dev, "no suitable video mode found\n");
 986                goto stop_clk;
 987        }
 988
 989
 990        regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 991        if (!regs) {
 992                dev_err(dev, "resources unusable\n");
 993                ret = -ENXIO;
 994                goto stop_clk;
 995        }
 996
 997        sinfo->irq_base = platform_get_irq(pdev, 0);
 998        if (sinfo->irq_base < 0) {
 999                dev_err(dev, "unable to get irq\n");
1000                ret = sinfo->irq_base;
1001                goto stop_clk;
1002        }
1003
1004        /* Initialize video memory */
1005        map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1006        if (map) {
1007                /* use a pre-allocated memory buffer */
1008                info->fix.smem_start = map->start;
1009                info->fix.smem_len = resource_size(map);
1010                if (!request_mem_region(info->fix.smem_start,
1011                                        info->fix.smem_len, pdev->name)) {
1012                        ret = -EBUSY;
1013                        goto stop_clk;
1014                }
1015
1016                info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1017                if (!info->screen_base) {
1018                        ret = -ENOMEM;
1019                        goto release_intmem;
1020                }
1021
1022                /*
1023                 * Don't clear the framebuffer -- someone may have set
1024                 * up a splash image.
1025                 */
1026        } else {
1027                /* allocate memory buffer */
1028                ret = atmel_lcdfb_alloc_video_memory(sinfo);
1029                if (ret < 0) {
1030                        dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
1031                        goto stop_clk;
1032                }
1033        }
1034
1035        /* LCDC registers */
1036        info->fix.mmio_start = regs->start;
1037        info->fix.mmio_len = resource_size(regs);
1038
1039        if (!request_mem_region(info->fix.mmio_start,
1040                                info->fix.mmio_len, pdev->name)) {
1041                ret = -EBUSY;
1042                goto free_fb;
1043        }
1044
1045        sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
1046        if (!sinfo->mmio) {
1047                dev_err(dev, "cannot map LCDC registers\n");
1048                ret = -ENOMEM;
1049                goto release_mem;
1050        }
1051
1052        /* Initialize PWM for contrast or backlight ("off") */
1053        init_contrast(sinfo);
1054
1055        /* interrupt */
1056        ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
1057        if (ret) {
1058                dev_err(dev, "request_irq failed: %d\n", ret);
1059                goto unmap_mmio;
1060        }
1061
1062        /* Some operations on the LCDC might sleep and
1063         * require a preemptible task context */
1064        INIT_WORK(&sinfo->task, atmel_lcdfb_task);
1065
1066        ret = atmel_lcdfb_init_fbinfo(sinfo);
1067        if (ret < 0) {
1068                dev_err(dev, "init fbinfo failed: %d\n", ret);
1069                goto unregister_irqs;
1070        }
1071
1072        /*
1073         * This makes sure that our colour bitfield
1074         * descriptors are correctly initialised.
1075         */
1076        atmel_lcdfb_check_var(&info->var, info);
1077
1078        ret = fb_set_var(info, &info->var);
1079        if (ret) {
1080                dev_warn(dev, "unable to set display parameters\n");
1081                goto free_cmap;
1082        }
1083
1084        dev_set_drvdata(dev, info);
1085
1086        /*
1087         * Tell the world that we're ready to go
1088         */
1089        ret = register_framebuffer(info);
1090        if (ret < 0) {
1091                dev_err(dev, "failed to register framebuffer device: %d\n", ret);
1092                goto reset_drvdata;
1093        }
1094
1095        /* add selected videomode to modelist */
1096        fb_var_to_videomode(&fbmode, &info->var);
1097        fb_add_videomode(&fbmode, &info->modelist);
1098
1099        /* Power up the LCDC screen */
1100        if (sinfo->atmel_lcdfb_power_control)
1101                sinfo->atmel_lcdfb_power_control(1);
1102
1103        dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1104                       info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
1105
1106        return 0;
1107
1108reset_drvdata:
1109        dev_set_drvdata(dev, NULL);
1110free_cmap:
1111        fb_dealloc_cmap(&info->cmap);
1112unregister_irqs:
1113        cancel_work_sync(&sinfo->task);
1114        free_irq(sinfo->irq_base, info);
1115unmap_mmio:
1116        exit_backlight(sinfo);
1117        iounmap(sinfo->mmio);
1118release_mem:
1119        release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1120free_fb:
1121        if (map)
1122                iounmap(info->screen_base);
1123        else
1124                atmel_lcdfb_free_video_memory(sinfo);
1125
1126release_intmem:
1127        if (map)
1128                release_mem_region(info->fix.smem_start, info->fix.smem_len);
1129stop_clk:
1130        atmel_lcdfb_stop_clock(sinfo);
1131        clk_put(sinfo->lcdc_clk);
1132put_bus_clk:
1133        clk_put(sinfo->bus_clk);
1134free_info:
1135        framebuffer_release(info);
1136out:
1137        dev_dbg(dev, "%s FAILED\n", __func__);
1138        return ret;
1139}
1140
1141static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1142{
1143        struct device *dev = &pdev->dev;
1144        struct fb_info *info = dev_get_drvdata(dev);
1145        struct atmel_lcdfb_info *sinfo;
1146
1147        if (!info || !info->par)
1148                return 0;
1149        sinfo = info->par;
1150
1151        cancel_work_sync(&sinfo->task);
1152        exit_backlight(sinfo);
1153        if (sinfo->atmel_lcdfb_power_control)
1154                sinfo->atmel_lcdfb_power_control(0);
1155        unregister_framebuffer(info);
1156        atmel_lcdfb_stop_clock(sinfo);
1157        clk_put(sinfo->lcdc_clk);
1158        clk_put(sinfo->bus_clk);
1159        fb_dealloc_cmap(&info->cmap);
1160        free_irq(sinfo->irq_base, info);
1161        iounmap(sinfo->mmio);
1162        release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1163        if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1164                iounmap(info->screen_base);
1165                release_mem_region(info->fix.smem_start, info->fix.smem_len);
1166        } else {
1167                atmel_lcdfb_free_video_memory(sinfo);
1168        }
1169
1170        dev_set_drvdata(dev, NULL);
1171        framebuffer_release(info);
1172
1173        return 0;
1174}
1175
1176#ifdef CONFIG_PM
1177
1178static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1179{
1180        struct fb_info *info = platform_get_drvdata(pdev);
1181        struct atmel_lcdfb_info *sinfo = info->par;
1182
1183        /*
1184         * We don't want to handle interrupts while the clock is
1185         * stopped. It may take forever.
1186         */
1187        lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1188
1189        sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_CTR);
1190        lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1191        if (sinfo->atmel_lcdfb_power_control)
1192                sinfo->atmel_lcdfb_power_control(0);
1193
1194        atmel_lcdfb_stop(sinfo);
1195        atmel_lcdfb_stop_clock(sinfo);
1196
1197        return 0;
1198}
1199
1200static int atmel_lcdfb_resume(struct platform_device *pdev)
1201{
1202        struct fb_info *info = platform_get_drvdata(pdev);
1203        struct atmel_lcdfb_info *sinfo = info->par;
1204
1205        atmel_lcdfb_start_clock(sinfo);
1206        atmel_lcdfb_start(sinfo);
1207        if (sinfo->atmel_lcdfb_power_control)
1208                sinfo->atmel_lcdfb_power_control(1);
1209        lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1210
1211        /* Enable FIFO & DMA errors */
1212        lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1213                        | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1214
1215        return 0;
1216}
1217
1218#else
1219#define atmel_lcdfb_suspend     NULL
1220#define atmel_lcdfb_resume      NULL
1221#endif
1222
1223static struct platform_driver atmel_lcdfb_driver = {
1224        .remove         = __exit_p(atmel_lcdfb_remove),
1225        .suspend        = atmel_lcdfb_suspend,
1226        .resume         = atmel_lcdfb_resume,
1227        .id_table       = atmel_lcdfb_devtypes,
1228        .driver         = {
1229                .name   = "atmel_lcdfb",
1230                .owner  = THIS_MODULE,
1231        },
1232};
1233
1234module_platform_driver_probe(atmel_lcdfb_driver, atmel_lcdfb_probe);
1235
1236MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1237MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1238MODULE_LICENSE("GPL");
1239
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