sh_mobile_lcdcfb.c

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/*
 * SuperH Mobile LCDC Framebuffer
 *
 * Copyright (c) 2008 Magnus Damm
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/atomic.h>
#include <linux/backlight.h>
#include <linux/clk.h>
#include <linux/console.h>
#include <linux/ctype.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioctl.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/vmalloc.h>

#include <video/sh_mobile_lcdc.h>
#include <video/sh_mobile_meram.h>

#include "sh_mobile_lcdcfb.h"

/* ----------------------------------------------------------------------------
 * Overlay register definitions
 */

#define LDBCR           0xb00
#define LDBCR_UPC(n)        (1 << ((n) + 16))
#define LDBCR_UPF(n)        (1 << ((n) + 8))
#define LDBCR_UPD(n)        (1 << ((n) + 0))
#define LDBnBSIFR(n)        (0xb20 + (n) * 0x20 + 0x00)
#define LDBBSIFR_EN     (1 << 31)
#define LDBBSIFR_VS     (1 << 29)
#define LDBBSIFR_BRSEL      (1 << 28)
#define LDBBSIFR_MX     (1 << 27)
#define LDBBSIFR_MY     (1 << 26)
#define LDBBSIFR_CV3        (3 << 24)
#define LDBBSIFR_CV2        (2 << 24)
#define LDBBSIFR_CV1        (1 << 24)
#define LDBBSIFR_CV0        (0 << 24)
#define LDBBSIFR_CV_MASK    (3 << 24)
#define LDBBSIFR_LAY_MASK   (0xff << 16)
#define LDBBSIFR_LAY_SHIFT  16
#define LDBBSIFR_ROP3_MASK  (0xff << 16)
#define LDBBSIFR_ROP3_SHIFT 16
#define LDBBSIFR_AL_PL8     (3 << 14)
#define LDBBSIFR_AL_PL1     (2 << 14)
#define LDBBSIFR_AL_PK      (1 << 14)
#define LDBBSIFR_AL_1       (0 << 14)
#define LDBBSIFR_AL_MASK    (3 << 14)
#define LDBBSIFR_SWPL       (1 << 10)
#define LDBBSIFR_SWPW       (1 << 9)
#define LDBBSIFR_SWPB       (1 << 8)
#define LDBBSIFR_RY     (1 << 7)
#define LDBBSIFR_CHRR_420   (2 << 0)
#define LDBBSIFR_CHRR_422   (1 << 0)
#define LDBBSIFR_CHRR_444   (0 << 0)
#define LDBBSIFR_RPKF_ARGB32    (0x00 << 0)
#define LDBBSIFR_RPKF_RGB16 (0x03 << 0)
#define LDBBSIFR_RPKF_RGB24 (0x0b << 0)
#define LDBBSIFR_RPKF_MASK  (0x1f << 0)
#define LDBnBSSZR(n)        (0xb20 + (n) * 0x20 + 0x04)
#define LDBBSSZR_BVSS_MASK  (0xfff << 16)
#define LDBBSSZR_BVSS_SHIFT 16
#define LDBBSSZR_BHSS_MASK  (0xfff << 0)
#define LDBBSSZR_BHSS_SHIFT 0
#define LDBnBLOCR(n)        (0xb20 + (n) * 0x20 + 0x08)
#define LDBBLOCR_CVLC_MASK  (0xfff << 16)
#define LDBBLOCR_CVLC_SHIFT 16
#define LDBBLOCR_CHLC_MASK  (0xfff << 0)
#define LDBBLOCR_CHLC_SHIFT 0
#define LDBnBSMWR(n)        (0xb20 + (n) * 0x20 + 0x0c)
#define LDBBSMWR_BSMWA_MASK (0xffff << 16)
#define LDBBSMWR_BSMWA_SHIFT    16
#define LDBBSMWR_BSMW_MASK  (0xffff << 0)
#define LDBBSMWR_BSMW_SHIFT 0
#define LDBnBSAYR(n)        (0xb20 + (n) * 0x20 + 0x10)
#define LDBBSAYR_FG1A_MASK  (0xff << 24)
#define LDBBSAYR_FG1A_SHIFT 24
#define LDBBSAYR_FG1R_MASK  (0xff << 16)
#define LDBBSAYR_FG1R_SHIFT 16
#define LDBBSAYR_FG1G_MASK  (0xff << 8)
#define LDBBSAYR_FG1G_SHIFT 8
#define LDBBSAYR_FG1B_MASK  (0xff << 0)
#define LDBBSAYR_FG1B_SHIFT 0
#define LDBnBSACR(n)        (0xb20 + (n) * 0x20 + 0x14)
#define LDBBSACR_FG2A_MASK  (0xff << 24)
#define LDBBSACR_FG2A_SHIFT 24
#define LDBBSACR_FG2R_MASK  (0xff << 16)
#define LDBBSACR_FG2R_SHIFT 16
#define LDBBSACR_FG2G_MASK  (0xff << 8)
#define LDBBSACR_FG2G_SHIFT 8
#define LDBBSACR_FG2B_MASK  (0xff << 0)
#define LDBBSACR_FG2B_SHIFT 0
#define LDBnBSAAR(n)        (0xb20 + (n) * 0x20 + 0x18)
#define LDBBSAAR_AP_MASK    (0xff << 24)
#define LDBBSAAR_AP_SHIFT   24
#define LDBBSAAR_R_MASK     (0xff << 16)
#define LDBBSAAR_R_SHIFT    16
#define LDBBSAAR_GY_MASK    (0xff << 8)
#define LDBBSAAR_GY_SHIFT   8
#define LDBBSAAR_B_MASK     (0xff << 0)
#define LDBBSAAR_B_SHIFT    0
#define LDBnBPPCR(n)        (0xb20 + (n) * 0x20 + 0x1c)
#define LDBBPPCR_AP_MASK    (0xff << 24)
#define LDBBPPCR_AP_SHIFT   24
#define LDBBPPCR_R_MASK     (0xff << 16)
#define LDBBPPCR_R_SHIFT    16
#define LDBBPPCR_GY_MASK    (0xff << 8)
#define LDBBPPCR_GY_SHIFT   8
#define LDBBPPCR_B_MASK     (0xff << 0)
#define LDBBPPCR_B_SHIFT    0
#define LDBnBBGCL(n)        (0xb10 + (n) * 0x04)
#define LDBBBGCL_BGA_MASK   (0xff << 24)
#define LDBBBGCL_BGA_SHIFT  24
#define LDBBBGCL_BGR_MASK   (0xff << 16)
#define LDBBBGCL_BGR_SHIFT  16
#define LDBBBGCL_BGG_MASK   (0xff << 8)
#define LDBBBGCL_BGG_SHIFT  8
#define LDBBBGCL_BGB_MASK   (0xff << 0)
#define LDBBBGCL_BGB_SHIFT  0

#define SIDE_B_OFFSET 0x1000
#define MIRROR_OFFSET 0x2000

#define MAX_XRES 1920
#define MAX_YRES 1080

enum sh_mobile_lcdc_overlay_mode {
    LCDC_OVERLAY_BLEND,
    LCDC_OVERLAY_ROP3,
};

/*
 * struct sh_mobile_lcdc_overlay - LCDC display overlay
 *
 * @channel: LCDC channel this overlay belongs to
 * @cfg: Overlay configuration
 * @info: Frame buffer device
 * @index: Overlay index (0-3)
 * @base: Overlay registers base address
 * @enabled: True if the overlay is enabled
 * @mode: Overlay blending mode (alpha blend or ROP3)
 * @alpha: Global alpha blending value (0-255, for alpha blending mode)
 * @rop3: Raster operation (for ROP3 mode)
 * @fb_mem: Frame buffer virtual memory address
 * @fb_size: Frame buffer size in bytes
 * @dma_handle: Frame buffer DMA address
 * @base_addr_y: Overlay base address (RGB or luma component)
 * @base_addr_c: Overlay base address (chroma component)
 * @pan_y_offset: Panning linear offset in bytes (luma component)
 * @format: Current pixelf format
 * @xres: Horizontal visible resolution
 * @xres_virtual: Horizontal total resolution
 * @yres: Vertical visible resolution
 * @yres_virtual: Vertical total resolution
 * @pitch: Overlay line pitch
 * @pos_x: Horizontal overlay position
 * @pos_y: Vertical overlay position
 */
struct sh_mobile_lcdc_overlay {
    struct sh_mobile_lcdc_chan *channel;

    const struct sh_mobile_lcdc_overlay_cfg *cfg;
    struct fb_info *info;

    unsigned int index;
    unsigned long base;

    bool enabled;
    enum sh_mobile_lcdc_overlay_mode mode;
    unsigned int alpha;
    unsigned int rop3;

    void *fb_mem;
    unsigned long fb_size;

    dma_addr_t dma_handle;
    unsigned long base_addr_y;
    unsigned long base_addr_c;
    unsigned long pan_y_offset;

    const struct sh_mobile_lcdc_format_info *format;
    unsigned int xres;
    unsigned int xres_virtual;
    unsigned int yres;
    unsigned int yres_virtual;
    unsigned int pitch;
    int pos_x;
    int pos_y;
};

struct sh_mobile_lcdc_priv {
    void __iomem *base;
    int irq;
    atomic_t hw_usecnt;
    struct device *dev;
    struct clk *dot_clk;
    unsigned long lddckr;

    struct sh_mobile_lcdc_chan ch[2];
    struct sh_mobile_lcdc_overlay overlays[4];

    struct notifier_block notifier;
    int started;
    int forced_fourcc; /* 2 channel LCDC must share fourcc setting */
    struct sh_mobile_meram_info *meram_dev;
};

/* -----------------------------------------------------------------------------
 * Registers access
 */

static unsigned long lcdc_offs_mainlcd[NR_CH_REGS] = {
    [LDDCKPAT1R] = 0x400,
    [LDDCKPAT2R] = 0x404,
    [LDMT1R] = 0x418,
    [LDMT2R] = 0x41c,
    [LDMT3R] = 0x420,
    [LDDFR] = 0x424,
    [LDSM1R] = 0x428,
    [LDSM2R] = 0x42c,
    [LDSA1R] = 0x430,
    [LDSA2R] = 0x434,
    [LDMLSR] = 0x438,
    [LDHCNR] = 0x448,
    [LDHSYNR] = 0x44c,
    [LDVLNR] = 0x450,
    [LDVSYNR] = 0x454,
    [LDPMR] = 0x460,
    [LDHAJR] = 0x4a0,
};

static unsigned long lcdc_offs_sublcd[NR_CH_REGS] = {
    [LDDCKPAT1R] = 0x408,
    [LDDCKPAT2R] = 0x40c,
    [LDMT1R] = 0x600,
    [LDMT2R] = 0x604,
    [LDMT3R] = 0x608,
    [LDDFR] = 0x60c,
    [LDSM1R] = 0x610,
    [LDSM2R] = 0x614,
    [LDSA1R] = 0x618,
    [LDMLSR] = 0x620,
    [LDHCNR] = 0x624,
    [LDHSYNR] = 0x628,
    [LDVLNR] = 0x62c,
    [LDVSYNR] = 0x630,
    [LDPMR] = 0x63c,
};

static bool banked(int reg_nr)
{
    switch (reg_nr) {
    case LDMT1R:
    case LDMT2R:
    case LDMT3R:
    case LDDFR:
    case LDSM1R:
    case LDSA1R:
    case LDSA2R:
    case LDMLSR:
    case LDHCNR:
    case LDHSYNR:
    case LDVLNR:
    case LDVSYNR:
        return true;
    }
    return false;
}

static int lcdc_chan_is_sublcd(struct sh_mobile_lcdc_chan *chan)
{
    return chan->cfg->chan == LCDC_CHAN_SUBLCD;
}

static void lcdc_write_chan(struct sh_mobile_lcdc_chan *chan,
                int reg_nr, unsigned long data)
{
    iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr]);
    if (banked(reg_nr))
        iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
              SIDE_B_OFFSET);
}

static void lcdc_write_chan_mirror(struct sh_mobile_lcdc_chan *chan,
                int reg_nr, unsigned long data)
{
    iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
          MIRROR_OFFSET);
}

static unsigned long lcdc_read_chan(struct sh_mobile_lcdc_chan *chan,
                    int reg_nr)
{
    return ioread32(chan->lcdc->base + chan->reg_offs[reg_nr]);
}

static void lcdc_write_overlay(struct sh_mobile_lcdc_overlay *ovl,
                   int reg, unsigned long data)
{
    iowrite32(data, ovl->channel->lcdc->base + reg);
    iowrite32(data, ovl->channel->lcdc->base + reg + SIDE_B_OFFSET);
}

static void lcdc_write(struct sh_mobile_lcdc_priv *priv,
               unsigned long reg_offs, unsigned long data)
{
    iowrite32(data, priv->base + reg_offs);
}

static unsigned long lcdc_read(struct sh_mobile_lcdc_priv *priv,
                   unsigned long reg_offs)
{
    return ioread32(priv->base + reg_offs);
}

static void lcdc_wait_bit(struct sh_mobile_lcdc_priv *priv,
              unsigned long reg_offs,
              unsigned long mask, unsigned long until)
{
    while ((lcdc_read(priv, reg_offs) & mask) != until)
        cpu_relax();
}

/* -----------------------------------------------------------------------------
 * Clock management
 */

static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv)
{
    if (atomic_inc_and_test(&priv->hw_usecnt)) {
        if (priv->dot_clk)
            clk_enable(priv->dot_clk);
        pm_runtime_get_sync(priv->dev);
        if (priv->meram_dev && priv->meram_dev->pdev)
            pm_runtime_get_sync(&priv->meram_dev->pdev->dev);
    }
}

static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv)
{
    if (atomic_sub_return(1, &priv->hw_usecnt) == -1) {
        if (priv->meram_dev && priv->meram_dev->pdev)
            pm_runtime_put_sync(&priv->meram_dev->pdev->dev);
        pm_runtime_put(priv->dev);
        if (priv->dot_clk)
            clk_disable(priv->dot_clk);
    }
}

static int sh_mobile_lcdc_setup_clocks(struct sh_mobile_lcdc_priv *priv,
                       int clock_source)
{
    struct clk *clk;
    char *str;

    switch (clock_source) {
    case LCDC_CLK_BUS:
        str = "bus_clk";
        priv->lddckr = LDDCKR_ICKSEL_BUS;
        break;
    case LCDC_CLK_PERIPHERAL:
        str = "peripheral_clk";
        priv->lddckr = LDDCKR_ICKSEL_MIPI;
        break;
    case LCDC_CLK_EXTERNAL:
        str = NULL;
        priv->lddckr = LDDCKR_ICKSEL_HDMI;
        break;
    default:
        return -EINVAL;
    }

    if (str == NULL)
        return 0;

    clk = clk_get(priv->dev, str);
    if (IS_ERR(clk)) {
        dev_err(priv->dev, "cannot get dot clock %s\n", str);
        return PTR_ERR(clk);
    }

    priv->dot_clk = clk;
    return 0;
}

/* -----------------------------------------------------------------------------
 * Display, panel and deferred I/O
 */

static void lcdc_sys_write_index(void *handle, unsigned long data)
{
    struct sh_mobile_lcdc_chan *ch = handle;

    lcdc_write(ch->lcdc, _LDDWD0R, data | LDDWDxR_WDACT);
    lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
    lcdc_write(ch->lcdc, _LDDWAR, LDDWAR_WA |
           (lcdc_chan_is_sublcd(ch) ? 2 : 0));
    lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
}

static void lcdc_sys_write_data(void *handle, unsigned long data)
{
    struct sh_mobile_lcdc_chan *ch = handle;

    lcdc_write(ch->lcdc, _LDDWD0R, data | LDDWDxR_WDACT | LDDWDxR_RSW);
    lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
    lcdc_write(ch->lcdc, _LDDWAR, LDDWAR_WA |
           (lcdc_chan_is_sublcd(ch) ? 2 : 0));
    lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
}

static unsigned long lcdc_sys_read_data(void *handle)
{
    struct sh_mobile_lcdc_chan *ch = handle;

    lcdc_write(ch->lcdc, _LDDRDR, LDDRDR_RSR);
    lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
    lcdc_write(ch->lcdc, _LDDRAR, LDDRAR_RA |
           (lcdc_chan_is_sublcd(ch) ? 2 : 0));
    udelay(1);
    lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);

    return lcdc_read(ch->lcdc, _LDDRDR) & LDDRDR_DRD_MASK;
}

struct sh_mobile_lcdc_sys_bus_ops sh_mobile_lcdc_sys_bus_ops = {
    lcdc_sys_write_index,
    lcdc_sys_write_data,
    lcdc_sys_read_data,
};

static int sh_mobile_lcdc_sginit(struct fb_info *info,
                  struct list_head *pagelist)
{
    struct sh_mobile_lcdc_chan *ch = info->par;
    unsigned int nr_pages_max = ch->fb_size >> PAGE_SHIFT;
    struct page *page;
    int nr_pages = 0;

    sg_init_table(ch->sglist, nr_pages_max);

    list_for_each_entry(page, pagelist, lru)
        sg_set_page(&ch->sglist[nr_pages++], page, PAGE_SIZE, 0);

    return nr_pages;
}

static void sh_mobile_lcdc_deferred_io(struct fb_info *info,
                       struct list_head *pagelist)
{
    struct sh_mobile_lcdc_chan *ch = info->par;
    const struct sh_mobile_lcdc_panel_cfg *panel = &ch->cfg->panel_cfg;

    /* enable clocks before accessing hardware */
    sh_mobile_lcdc_clk_on(ch->lcdc);

    /*
     * It's possible to get here without anything on the pagelist via
     * sh_mobile_lcdc_deferred_io_touch() or via a userspace fsync()
     * invocation. In the former case, the acceleration routines are
     * stepped in to when using the framebuffer console causing the
     * workqueue to be scheduled without any dirty pages on the list.
     *
     * Despite this, a panel update is still needed given that the
     * acceleration routines have their own methods for writing in
     * that still need to be updated.
     *
     * The fsync() and empty pagelist case could be optimized for,
     * but we don't bother, as any application exhibiting such
     * behaviour is fundamentally broken anyways.
     */
    if (!list_empty(pagelist)) {
        unsigned int nr_pages = sh_mobile_lcdc_sginit(info, pagelist);

        /* trigger panel update */
        dma_map_sg(ch->lcdc->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
        if (panel->start_transfer)
            panel->start_transfer(ch, &sh_mobile_lcdc_sys_bus_ops);
        lcdc_write_chan(ch, LDSM2R, LDSM2R_OSTRG);
        dma_unmap_sg(ch->lcdc->dev, ch->sglist, nr_pages,
                 DMA_TO_DEVICE);
    } else {
        if (panel->start_transfer)
            panel->start_transfer(ch, &sh_mobile_lcdc_sys_bus_ops);
        lcdc_write_chan(ch, LDSM2R, LDSM2R_OSTRG);
    }
}

static void sh_mobile_lcdc_deferred_io_touch(struct fb_info *info)
{
    struct fb_deferred_io *fbdefio = info->fbdefio;

    if (fbdefio)
        schedule_delayed_work(&info->deferred_work, fbdefio->delay);
}

static void sh_mobile_lcdc_display_on(struct sh_mobile_lcdc_chan *ch)
{
    const struct sh_mobile_lcdc_panel_cfg *panel = &ch->cfg->panel_cfg;

    if (ch->tx_dev) {
        int ret;

        ret = ch->tx_dev->ops->display_on(ch->tx_dev);
        if (ret < 0)
            return;

        if (ret == SH_MOBILE_LCDC_DISPLAY_DISCONNECTED)
            ch->info->state = FBINFO_STATE_SUSPENDED;
    }

    /* HDMI must be enabled before LCDC configuration */
    if (panel->display_on)
        panel->display_on();
}

static void sh_mobile_lcdc_display_off(struct sh_mobile_lcdc_chan *ch)
{
    const struct sh_mobile_lcdc_panel_cfg *panel = &ch->cfg->panel_cfg;

    if (panel->display_off)
        panel->display_off();

    if (ch->tx_dev)
        ch->tx_dev->ops->display_off(ch->tx_dev);
}

static bool
sh_mobile_lcdc_must_reconfigure(struct sh_mobile_lcdc_chan *ch,
                const struct fb_videomode *new_mode)
{
    dev_dbg(ch->info->dev, "Old %ux%u, new %ux%u\n",
        ch->display.mode.xres, ch->display.mode.yres,
        new_mode->xres, new_mode->yres);

    /* It can be a different monitor with an equal video-mode */
    if (fb_mode_is_equal(&ch->display.mode, new_mode))
        return false;

    dev_dbg(ch->info->dev, "Switching %u -> %u lines\n",
        ch->display.mode.yres, new_mode->yres);
    ch->display.mode = *new_mode;

    return true;
}

static int sh_mobile_lcdc_check_var(struct fb_var_screeninfo *var,
                    struct fb_info *info);

static int sh_mobile_lcdc_display_notify(struct sh_mobile_lcdc_chan *ch,
                     enum sh_mobile_lcdc_entity_event event,
                     const struct fb_videomode *mode,
                     const struct fb_monspecs *monspec)
{
    struct fb_info *info = ch->info;
    struct fb_var_screeninfo var;
    int ret = 0;

    switch (event) {
    case SH_MOBILE_LCDC_EVENT_DISPLAY_CONNECT:
        /* HDMI plug in */
        if (lock_fb_info(info)) {
            console_lock();

            ch->display.width = monspec->max_x * 10;
            ch->display.height = monspec->max_y * 10;

            if (!sh_mobile_lcdc_must_reconfigure(ch, mode) &&
                info->state == FBINFO_STATE_RUNNING) {
                /* First activation with the default monitor.
                 * Just turn on, if we run a resume here, the
                 * logo disappears.
                 */
                info->var.width = monspec->max_x * 10;
                info->var.height = monspec->max_y * 10;
                sh_mobile_lcdc_display_on(ch);
            } else {
                /* New monitor or have to wake up */
                fb_set_suspend(info, 0);
            }

            console_unlock();
            unlock_fb_info(info);
        }
        break;

    case SH_MOBILE_LCDC_EVENT_DISPLAY_DISCONNECT:
        /* HDMI disconnect */
        if (lock_fb_info(info)) {
            console_lock();
            fb_set_suspend(info, 1);
            console_unlock();
            unlock_fb_info(info);
        }
        break;

    case SH_MOBILE_LCDC_EVENT_DISPLAY_MODE:
        /* Validate a proposed new mode */
        fb_videomode_to_var(&var, mode);
        var.bits_per_pixel = info->var.bits_per_pixel;
        var.grayscale = info->var.grayscale;
        ret = sh_mobile_lcdc_check_var(&var, info);
        break;
    }

    return ret;
}

/* -----------------------------------------------------------------------------
 * Format helpers
 */

struct sh_mobile_lcdc_format_info {
    u32 fourcc;
    unsigned int bpp;
    bool yuv;
    u32 lddfr;
};

static const struct sh_mobile_lcdc_format_info sh_mobile_format_infos[] = {
    {
        .fourcc = V4L2_PIX_FMT_RGB565,
        .bpp = 16,
        .yuv = false,
        .lddfr = LDDFR_PKF_RGB16,
    }, {
        .fourcc = V4L2_PIX_FMT_BGR24,
        .bpp = 24,
        .yuv = false,
        .lddfr = LDDFR_PKF_RGB24,
    }, {
        .fourcc = V4L2_PIX_FMT_BGR32,
        .bpp = 32,
        .yuv = false,
        .lddfr = LDDFR_PKF_ARGB32,
    }, {
        .fourcc = V4L2_PIX_FMT_NV12,
        .bpp = 12,
        .yuv = true,
        .lddfr = LDDFR_CC | LDDFR_YF_420,
    }, {
        .fourcc = V4L2_PIX_FMT_NV21,
        .bpp = 12,
        .yuv = true,
        .lddfr = LDDFR_CC | LDDFR_YF_420,
    }, {
        .fourcc = V4L2_PIX_FMT_NV16,
        .bpp = 16,
        .yuv = true,
        .lddfr = LDDFR_CC | LDDFR_YF_422,
    }, {
        .fourcc = V4L2_PIX_FMT_NV61,
        .bpp = 16,
        .yuv = true,
        .lddfr = LDDFR_CC | LDDFR_YF_422,
    }, {
        .fourcc = V4L2_PIX_FMT_NV24,
        .bpp = 24,
        .yuv = true,
        .lddfr = LDDFR_CC | LDDFR_YF_444,
    }, {
        .fourcc = V4L2_PIX_FMT_NV42,
        .bpp = 24,
        .yuv = true,
        .lddfr = LDDFR_CC | LDDFR_YF_444,
    },
};

static const struct sh_mobile_lcdc_format_info *
sh_mobile_format_info(u32 fourcc)
{
    unsigned int i;

    for (i = 0; i < ARRAY_SIZE(sh_mobile_format_infos); ++i) {
        if (sh_mobile_format_infos[i].fourcc == fourcc)
            return &sh_mobile_format_infos[i];
    }

    return NULL;
}

static int sh_mobile_format_fourcc(const struct fb_var_screeninfo *var)
{
    if (var->grayscale > 1)
        return var->grayscale;

    switch (var->bits_per_pixel) {
    case 16:
        return V4L2_PIX_FMT_RGB565;
    case 24:
        return V4L2_PIX_FMT_BGR24;
    case 32:
        return V4L2_PIX_FMT_BGR32;
    default:
        return 0;
    }
}

static int sh_mobile_format_is_fourcc(const struct fb_var_screeninfo *var)
{
    return var->grayscale > 1;
}

/* -----------------------------------------------------------------------------
 * Start, stop and IRQ
 */

static irqreturn_t sh_mobile_lcdc_irq(int irq, void *data)
{
    struct sh_mobile_lcdc_priv *priv = data;
    struct sh_mobile_lcdc_chan *ch;
    unsigned long ldintr;
    int is_sub;
    int k;

    /* Acknowledge interrupts and disable further VSYNC End IRQs. */
    ldintr = lcdc_read(priv, _LDINTR);
    lcdc_write(priv, _LDINTR, (ldintr ^ LDINTR_STATUS_MASK) & ~LDINTR_VEE);

    /* figure out if this interrupt is for main or sub lcd */
    is_sub = (lcdc_read(priv, _LDSR) & LDSR_MSS) ? 1 : 0;

    /* wake up channel and disable clocks */
    for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
        ch = &priv->ch[k];

        if (!ch->enabled)
            continue;

        /* Frame End */
        if (ldintr & LDINTR_FS) {
            if (is_sub == lcdc_chan_is_sublcd(ch)) {
                ch->frame_end = 1;
                wake_up(&ch->frame_end_wait);

                sh_mobile_lcdc_clk_off(priv);
            }
        }

        /* VSYNC End */
        if (ldintr & LDINTR_VES)
            complete(&ch->vsync_completion);
    }

    return IRQ_HANDLED;
}

static int sh_mobile_lcdc_wait_for_vsync(struct sh_mobile_lcdc_chan *ch)
{
    unsigned long ldintr;
    int ret;

    /* Enable VSync End interrupt and be careful not to acknowledge any
     * pending interrupt.
     */
    ldintr = lcdc_read(ch->lcdc, _LDINTR);
    ldintr |= LDINTR_VEE | LDINTR_STATUS_MASK;
    lcdc_write(ch->lcdc, _LDINTR, ldintr);

    ret = wait_for_completion_interruptible_timeout(&ch->vsync_completion,
                            msecs_to_jiffies(100));
    if (!ret)
        return -ETIMEDOUT;

    return 0;
}

static void sh_mobile_lcdc_start_stop(struct sh_mobile_lcdc_priv *priv,
                      int start)
{
    unsigned long tmp = lcdc_read(priv, _LDCNT2R);
    int k;

    /* start or stop the lcdc */
    if (start)
        lcdc_write(priv, _LDCNT2R, tmp | LDCNT2R_DO);
    else
        lcdc_write(priv, _LDCNT2R, tmp & ~LDCNT2R_DO);

    /* wait until power is applied/stopped on all channels */
    for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
        if (lcdc_read(priv, _LDCNT2R) & priv->ch[k].enabled)
            while (1) {
                tmp = lcdc_read_chan(&priv->ch[k], LDPMR)
                    & LDPMR_LPS;
                if (start && tmp == LDPMR_LPS)
                    break;
                if (!start && tmp == 0)
                    break;
                cpu_relax();
            }

    if (!start)
        lcdc_write(priv, _LDDCKSTPR, 1); /* stop dotclock */
}

static void sh_mobile_lcdc_geometry(struct sh_mobile_lcdc_chan *ch)
{
    const struct fb_var_screeninfo *var = &ch->info->var;
    const struct fb_videomode *mode = &ch->display.mode;
    unsigned long h_total, hsync_pos, display_h_total;
    u32 tmp;

    tmp = ch->ldmt1r_value;
    tmp |= (var->sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : LDMT1R_VPOL;
    tmp |= (var->sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : LDMT1R_HPOL;
    tmp |= (ch->cfg->flags & LCDC_FLAGS_DWPOL) ? LDMT1R_DWPOL : 0;
    tmp |= (ch->cfg->flags & LCDC_FLAGS_DIPOL) ? LDMT1R_DIPOL : 0;
    tmp |= (ch->cfg->flags & LCDC_FLAGS_DAPOL) ? LDMT1R_DAPOL : 0;
    tmp |= (ch->cfg->flags & LCDC_FLAGS_HSCNT) ? LDMT1R_HSCNT : 0;
    tmp |= (ch->cfg->flags & LCDC_FLAGS_DWCNT) ? LDMT1R_DWCNT : 0;
    lcdc_write_chan(ch, LDMT1R, tmp);

    /* setup SYS bus */
    lcdc_write_chan(ch, LDMT2R, ch->cfg->sys_bus_cfg.ldmt2r);
    lcdc_write_chan(ch, LDMT3R, ch->cfg->sys_bus_cfg.ldmt3r);

    /* horizontal configuration */
    h_total = mode->xres + mode->hsync_len + mode->left_margin
        + mode->right_margin;
    tmp = h_total / 8; /* HTCN */
    tmp |= (min(mode->xres, ch->xres) / 8) << 16; /* HDCN */
    lcdc_write_chan(ch, LDHCNR, tmp);

    hsync_pos = mode->xres + mode->right_margin;
    tmp = hsync_pos / 8; /* HSYNP */
    tmp |= (mode->hsync_len / 8) << 16; /* HSYNW */
    lcdc_write_chan(ch, LDHSYNR, tmp);

    /* vertical configuration */
    tmp = mode->yres + mode->vsync_len + mode->upper_margin
        + mode->lower_margin; /* VTLN */
    tmp |= min(mode->yres, ch->yres) << 16; /* VDLN */
    lcdc_write_chan(ch, LDVLNR, tmp);

    tmp = mode->yres + mode->lower_margin; /* VSYNP */
    tmp |= mode->vsync_len << 16; /* VSYNW */
    lcdc_write_chan(ch, LDVSYNR, tmp);

    /* Adjust horizontal synchronisation for HDMI */
    display_h_total = mode->xres + mode->hsync_len + mode->left_margin
            + mode->right_margin;
    tmp = ((mode->xres & 7) << 24) | ((display_h_total & 7) << 16)
        | ((mode->hsync_len & 7) << 8) | (hsync_pos & 7);
    lcdc_write_chan(ch, LDHAJR, tmp);
}

static void sh_mobile_lcdc_overlay_setup(struct sh_mobile_lcdc_overlay *ovl)
{
    u32 format = 0;

    if (!ovl->enabled) {
        lcdc_write(ovl->channel->lcdc, LDBCR, LDBCR_UPC(ovl->index));
        lcdc_write_overlay(ovl, LDBnBSIFR(ovl->index), 0);
        lcdc_write(ovl->channel->lcdc, LDBCR,
               LDBCR_UPF(ovl->index) | LDBCR_UPD(ovl->index));
        return;
    }

    ovl->base_addr_y = ovl->dma_handle;
    ovl->base_addr_c = ovl->dma_handle
             + ovl->xres_virtual * ovl->yres_virtual;

    switch (ovl->mode) {
    case LCDC_OVERLAY_BLEND:
        format = LDBBSIFR_EN | (ovl->alpha << LDBBSIFR_LAY_SHIFT);
        break;

    case LCDC_OVERLAY_ROP3:
        format = LDBBSIFR_EN | LDBBSIFR_BRSEL
               | (ovl->rop3 << LDBBSIFR_ROP3_SHIFT);
        break;
    }

    switch (ovl->format->fourcc) {
    case V4L2_PIX_FMT_RGB565:
    case V4L2_PIX_FMT_NV21:
    case V4L2_PIX_FMT_NV61:
    case V4L2_PIX_FMT_NV42:
        format |= LDBBSIFR_SWPL | LDBBSIFR_SWPW;
        break;
    case V4L2_PIX_FMT_BGR24:
    case V4L2_PIX_FMT_NV12:
    case V4L2_PIX_FMT_NV16:
    case V4L2_PIX_FMT_NV24:
        format |= LDBBSIFR_SWPL | LDBBSIFR_SWPW | LDBBSIFR_SWPB;
        break;
    case V4L2_PIX_FMT_BGR32:
    default:
        format |= LDBBSIFR_SWPL;
        break;
    }

    switch (ovl->format->fourcc) {
    case V4L2_PIX_FMT_RGB565:
        format |= LDBBSIFR_AL_1 | LDBBSIFR_RY | LDBBSIFR_RPKF_RGB16;
        break;
    case V4L2_PIX_FMT_BGR24:
        format |= LDBBSIFR_AL_1 | LDBBSIFR_RY | LDBBSIFR_RPKF_RGB24;
        break;
    case V4L2_PIX_FMT_BGR32:
        format |= LDBBSIFR_AL_PK | LDBBSIFR_RY | LDDFR_PKF_ARGB32;
        break;
    case V4L2_PIX_FMT_NV12:
    case V4L2_PIX_FMT_NV21:
        format |= LDBBSIFR_AL_1 | LDBBSIFR_CHRR_420;
        break;
    case V4L2_PIX_FMT_NV16:
    case V4L2_PIX_FMT_NV61:
        format |= LDBBSIFR_AL_1 | LDBBSIFR_CHRR_422;
        break;
    case V4L2_PIX_FMT_NV24:
    case V4L2_PIX_FMT_NV42:
        format |= LDBBSIFR_AL_1 | LDBBSIFR_CHRR_444;
        break;
    }

    lcdc_write(ovl->channel->lcdc, LDBCR, LDBCR_UPC(ovl->index));

    lcdc_write_overlay(ovl, LDBnBSIFR(ovl->index), format);

    lcdc_write_overlay(ovl, LDBnBSSZR(ovl->index),
        (ovl->yres << LDBBSSZR_BVSS_SHIFT) |
        (ovl->xres << LDBBSSZR_BHSS_SHIFT));
    lcdc_write_overlay(ovl, LDBnBLOCR(ovl->index),
        (ovl->pos_y << LDBBLOCR_CVLC_SHIFT) |
        (ovl->pos_x << LDBBLOCR_CHLC_SHIFT));
    lcdc_write_overlay(ovl, LDBnBSMWR(ovl->index),
        ovl->pitch << LDBBSMWR_BSMW_SHIFT);

    lcdc_write_overlay(ovl, LDBnBSAYR(ovl->index), ovl->base_addr_y);
    lcdc_write_overlay(ovl, LDBnBSACR(ovl->index), ovl->base_addr_c);

    lcdc_write(ovl->channel->lcdc, LDBCR,
           LDBCR_UPF(ovl->index) | LDBCR_UPD(ovl->index));
}

/*
 * __sh_mobile_lcdc_start - Configure and start the LCDC
 * @priv: LCDC device
 *
 * Configure all enabled channels and start the LCDC device. All external
 * devices (clocks, MERAM, panels, ...) are not touched by this function.
 */
static void __sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
{
    struct sh_mobile_lcdc_chan *ch;
    unsigned long tmp;
    int k, m;

    /* Enable LCDC channels. Read data from external memory, avoid using the
     * BEU for now.
     */
    lcdc_write(priv, _LDCNT2R, priv->ch[0].enabled | priv->ch[1].enabled);

    /* Stop the LCDC first and disable all interrupts. */
    sh_mobile_lcdc_start_stop(priv, 0);
    lcdc_write(priv, _LDINTR, 0);

    /* Configure power supply, dot clocks and start them. */
    tmp = priv->lddckr;
    for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
        ch = &priv->ch[k];
        if (!ch->enabled)
            continue;

        /* Power supply */
        lcdc_write_chan(ch, LDPMR, 0);

        m = ch->cfg->clock_divider;
        if (!m)
            continue;

        /* FIXME: sh7724 can only use 42, 48, 54 and 60 for the divider
         * denominator.
         */
        lcdc_write_chan(ch, LDDCKPAT1R, 0);
        lcdc_write_chan(ch, LDDCKPAT2R, (1 << (m/2)) - 1);

        if (m == 1)
            m = LDDCKR_MOSEL;
        tmp |= m << (lcdc_chan_is_sublcd(ch) ? 8 : 0);
    }

    lcdc_write(priv, _LDDCKR, tmp);
    lcdc_write(priv, _LDDCKSTPR, 0);
    lcdc_wait_bit(priv, _LDDCKSTPR, ~0, 0);

    /* Setup geometry, format, frame buffer memory and operation mode. */
    for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
        ch = &priv->ch[k];
        if (!ch->enabled)
            continue;

        sh_mobile_lcdc_geometry(ch);

        tmp = ch->format->lddfr;

        if (ch->format->yuv) {
            switch (ch->colorspace) {
            case V4L2_COLORSPACE_REC709:
                tmp |= LDDFR_CF1;
                break;
            case V4L2_COLORSPACE_JPEG:
                tmp |= LDDFR_CF0;
                break;
            }
        }

        lcdc_write_chan(ch, LDDFR, tmp);
        lcdc_write_chan(ch, LDMLSR, ch->line_size);
        lcdc_write_chan(ch, LDSA1R, ch->base_addr_y);
        if (ch->format->yuv)
            lcdc_write_chan(ch, LDSA2R, ch->base_addr_c);

        /* When using deferred I/O mode, configure the LCDC for one-shot
         * operation and enable the frame end interrupt. Otherwise use
         * continuous read mode.
         */
        if (ch->ldmt1r_value & LDMT1R_IFM &&
            ch->cfg->sys_bus_cfg.deferred_io_msec) {
            lcdc_write_chan(ch, LDSM1R, LDSM1R_OS);
            lcdc_write(priv, _LDINTR, LDINTR_FE);
        } else {
            lcdc_write_chan(ch, LDSM1R, 0);
        }
    }

    /* Word and long word swap. */
    switch (priv->ch[0].format->fourcc) {
    case V4L2_PIX_FMT_RGB565:
    case V4L2_PIX_FMT_NV21:
    case V4L2_PIX_FMT_NV61:
    case V4L2_PIX_FMT_NV42:
        tmp = LDDDSR_LS | LDDDSR_WS;
        break;
    case V4L2_PIX_FMT_BGR24:
    case V4L2_PIX_FMT_NV12:
    case V4L2_PIX_FMT_NV16:
    case V4L2_PIX_FMT_NV24:
        tmp = LDDDSR_LS | LDDDSR_WS | LDDDSR_BS;
        break;
    case V4L2_PIX_FMT_BGR32:
    default:
        tmp = LDDDSR_LS;
        break;
    }
    lcdc_write(priv, _LDDDSR, tmp);

    /* Enable the display output. */
    lcdc_write(priv, _LDCNT1R, LDCNT1R_DE);
    sh_mobile_lcdc_start_stop(priv, 1);
    priv->started = 1;
}

static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
{
    struct sh_mobile_meram_info *mdev = priv->meram_dev;
    struct sh_mobile_lcdc_chan *ch;
    unsigned long tmp;
    int ret;
    int k;

    /* enable clocks before accessing the hardware */
    for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
        if (priv->ch[k].enabled)
            sh_mobile_lcdc_clk_on(priv);
    }

    /* reset */
    lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) | LDCNT2R_BR);
    lcdc_wait_bit(priv, _LDCNT2R, LDCNT2R_BR, 0);

    for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
        const struct sh_mobile_lcdc_panel_cfg *panel;

        ch = &priv->ch[k];
        if (!ch->enabled)
            continue;

        panel = &ch->cfg->panel_cfg;
        if (panel->setup_sys) {
            ret = panel->setup_sys(ch, &sh_mobile_lcdc_sys_bus_ops);
            if (ret)
                return ret;
        }
    }

    /* Compute frame buffer base address and pitch for each channel. */
    for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
        int pixelformat;
        void *cache;

        ch = &priv->ch[k];
        if (!ch->enabled)
            continue;

        ch->base_addr_y = ch->dma_handle;
        ch->base_addr_c = ch->dma_handle
                + ch->xres_virtual * ch->yres_virtual;
        ch->line_size = ch->pitch;

        /* Enable MERAM if possible. */
        if (mdev == NULL || ch->cfg->meram_cfg == NULL)
            continue;

        /* Free the allocated MERAM cache. */
        if (ch->cache) {
            sh_mobile_meram_cache_free(mdev, ch->cache);
            ch->cache = NULL;
        }

        switch (ch->format->fourcc) {
        case V4L2_PIX_FMT_NV12:
        case V4L2_PIX_FMT_NV21:
        case V4L2_PIX_FMT_NV16:
        case V4L2_PIX_FMT_NV61:
            pixelformat = SH_MOBILE_MERAM_PF_NV;
            break;
        case V4L2_PIX_FMT_NV24:
        case V4L2_PIX_FMT_NV42:
            pixelformat = SH_MOBILE_MERAM_PF_NV24;
            break;
        case V4L2_PIX_FMT_RGB565:
        case V4L2_PIX_FMT_BGR24:
        case V4L2_PIX_FMT_BGR32:
        default:
            pixelformat = SH_MOBILE_MERAM_PF_RGB;
            break;
        }

        cache = sh_mobile_meram_cache_alloc(mdev, ch->cfg->meram_cfg,
                    ch->pitch, ch->yres, pixelformat,
                    &ch->line_size);
        if (!IS_ERR(cache)) {
            sh_mobile_meram_cache_update(mdev, cache,
                    ch->base_addr_y, ch->base_addr_c,
                    &ch->base_addr_y, &ch->base_addr_c);
            ch->cache = cache;
        }
    }

    for (k = 0; k < ARRAY_SIZE(priv->overlays); ++k) {
        struct sh_mobile_lcdc_overlay *ovl = &priv->overlays[k];
        sh_mobile_lcdc_overlay_setup(ovl);
    }

    /* Start the LCDC. */
    __sh_mobile_lcdc_start(priv);

    /* Setup deferred I/O, tell the board code to enable the panels, and
     * turn backlight on.
     */
    for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
        ch = &priv->ch[k];
        if (!ch->enabled)
            continue;

        tmp = ch->cfg->sys_bus_cfg.deferred_io_msec;
        if (ch->ldmt1r_value & LDMT1R_IFM && tmp) {
            ch->defio.deferred_io = sh_mobile_lcdc_deferred_io;
            ch->defio.delay = msecs_to_jiffies(tmp);
            ch->info->fbdefio = &ch->defio;
            fb_deferred_io_init(ch->info);
        }

        sh_mobile_lcdc_display_on(ch);

        if (ch->bl) {
            ch->bl->props.power = FB_BLANK_UNBLANK;
            backlight_update_status(ch->bl);
        }
    }

    return 0;
}

static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
{
    struct sh_mobile_lcdc_chan *ch;
    int k;

    /* clean up deferred io and ask board code to disable panel */
    for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
        ch = &priv->ch[k];
        if (!ch->enabled)
            continue;

        /* deferred io mode:
         * flush frame, and wait for frame end interrupt
         * clean up deferred io and enable clock
         */
        if (ch->info && ch->info->fbdefio) {
            ch->frame_end = 0;
            schedule_delayed_work(&ch->info->deferred_work, 0);
            wait_event(ch->frame_end_wait, ch->frame_end);
            fb_deferred_io_cleanup(ch->info);
            ch->info->fbdefio = NULL;
            sh_mobile_lcdc_clk_on(priv);
        }

        if (ch->bl) {
            ch->bl->props.power = FB_BLANK_POWERDOWN;
            backlight_update_status(ch->bl);
        }

        sh_mobile_lcdc_display_off(ch);

        /* Free the MERAM cache. */
        if (ch->cache) {
            sh_mobile_meram_cache_free(priv->meram_dev, ch->cache);
            ch->cache = 0;
        }

    }

    /* stop the lcdc */
    if (priv->started) {
        sh_mobile_lcdc_start_stop(priv, 0);
        priv->started = 0;
    }

    /* stop clocks */
    for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
        if (priv->ch[k].enabled)
            sh_mobile_lcdc_clk_off(priv);
}

static int __sh_mobile_lcdc_check_var(struct fb_var_screeninfo *var,
                      struct fb_info *info)
{
    if (var->xres > MAX_XRES || var->yres > MAX_YRES)
        return -EINVAL;

    /* Make sure the virtual resolution is at least as big as the visible
     * resolution.
     */
    if (var->xres_virtual < var->xres)
        var->xres_virtual = var->xres;
    if (var->yres_virtual < var->yres)
        var->yres_virtual = var->yres;

    if (sh_mobile_format_is_fourcc(var)) {
        const struct sh_mobile_lcdc_format_info *format;

        format = sh_mobile_format_info(var->grayscale);
        if (format == NULL)
            return -EINVAL;
        var->bits_per_pixel = format->bpp;

        /* Default to RGB and JPEG color-spaces for RGB and YUV formats
         * respectively.
         */
        if (!format->yuv)
            var->colorspace = V4L2_COLORSPACE_SRGB;
        else if (var->colorspace != V4L2_COLORSPACE_REC709)
            var->colorspace = V4L2_COLORSPACE_JPEG;
    } else {
        if (var->bits_per_pixel <= 16) {        /* RGB 565 */
            var->bits_per_pixel = 16;
            var->red.offset = 11;
            var->red.length = 5;
            var->green.offset = 5;
            var->green.length = 6;
            var->blue.offset = 0;
            var->blue.length = 5;
            var->transp.offset = 0;
            var->transp.length = 0;
        } else if (var->bits_per_pixel <= 24) {     /* RGB 888 */
            var->bits_per_pixel = 24;
            var->red.offset = 16;
            var->red.length = 8;
            var->green.offset = 8;
            var->green.length = 8;
            var->blue.offset = 0;
            var->blue.length = 8;
            var->transp.offset = 0;
            var->transp.length = 0;
        } else if (var->bits_per_pixel <= 32) {     /* RGBA 888 */
            var->bits_per_pixel = 32;
            var->red.offset = 16;
            var->red.length = 8;
            var->green.offset = 8;
            var->green.length = 8;
            var->blue.offset = 0;
            var->blue.length = 8;
            var->transp.offset = 24;
            var->transp.length = 8;
        } else
            return -EINVAL;

        var->red.msb_right = 0;
        var->green.msb_right = 0;
        var->blue.msb_right = 0;
        var->transp.msb_right = 0;
    }

    /* Make sure we don't exceed our allocated memory. */
    if (var->xres_virtual * var->yres_virtual * var->bits_per_pixel / 8 >
        info->fix.smem_len)
        return -EINVAL;

    return 0;
}

/* -----------------------------------------------------------------------------
 * Frame buffer operations - Overlays
 */

static ssize_t
overlay_alpha_show(struct device *dev, struct device_attribute *attr, char *buf)
{
    struct fb_info *info = dev_get_drvdata(dev);
    struct sh_mobile_lcdc_overlay *ovl = info->par;

    return scnprintf(buf, PAGE_SIZE, "%u\n", ovl->alpha);
}

static ssize_t
overlay_alpha_store(struct device *dev, struct device_attribute *attr,
            const char *buf, size_t count)
{
    struct fb_info *info = dev_get_drvdata(dev);
    struct sh_mobile_lcdc_overlay *ovl = info->par;
    unsigned int alpha;
    char *endp;

    alpha = simple_strtoul(buf, &endp, 10);
    if (isspace(*endp))
        endp++;

    if (endp - buf != count)
        return -EINVAL;

    if (alpha > 255)
        return -EINVAL;

    if (ovl->alpha != alpha) {
        ovl->alpha = alpha;

        if (ovl->mode == LCDC_OVERLAY_BLEND && ovl->enabled)
            sh_mobile_lcdc_overlay_setup(ovl);
    }

    return count;
}

static ssize_t
overlay_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
{
    struct fb_info *info = dev_get_drvdata(dev);
    struct sh_mobile_lcdc_overlay *ovl = info->par;

    return scnprintf(buf, PAGE_SIZE, "%u\n", ovl->mode);
}

static ssize_t
overlay_mode_store(struct device *dev, struct device_attribute *attr,
           const char *buf, size_t count)
{
    struct fb_info *info = dev_get_drvdata(dev);
    struct sh_mobile_lcdc_overlay *ovl = info->par;
    unsigned int mode;
    char *endp;

    mode = simple_strtoul(buf, &endp, 10);
    if (isspace(*endp))
        endp++;

    if (endp - buf != count)
        return -EINVAL;

    if (mode != LCDC_OVERLAY_BLEND && mode != LCDC_OVERLAY_ROP3)
        return -EINVAL;

    if (ovl->mode != mode) {
        ovl->mode = mode;

        if (ovl->enabled)
            sh_mobile_lcdc_overlay_setup(ovl);
    }

    return count;
}

static ssize_t
overlay_position_show(struct device *dev, struct device_attribute *attr,
              char *buf)
{
    struct fb_info *info = dev_get_drvdata(dev);
    struct sh_mobile_lcdc_overlay *ovl = info->par;

    return scnprintf(buf, PAGE_SIZE, "%d,%d\n", ovl->pos_x, ovl->pos_y);
}

static ssize_t
overlay_position_store(struct device *dev, struct device_attribute *attr,
               const char *buf, size_t count)
{
    struct fb_info *info = dev_get_drvdata(dev);
    struct sh_mobile_lcdc_overlay *ovl = info->par;
    char *endp;
    int pos_x;
    int pos_y;

    pos_x = simple_strtol(buf, &endp, 10);
    if (*endp != ',')
        return -EINVAL;

    pos_y = simple_strtol(endp + 1, &endp, 10);
    if (isspace(*endp))
        endp++;

    if (endp - buf != count)
        return -EINVAL;

    if (ovl->pos_x != pos_x || ovl->pos_y != pos_y) {
        ovl->pos_x = pos_x;
        ovl->pos_y = pos_y;

        if (ovl->enabled)
            sh_mobile_lcdc_overlay_setup(ovl);
    }

    return count;
}

static ssize_t
overlay_rop3_show(struct device *dev, struct device_attribute *attr, char *buf)
{
    struct fb_info *info = dev_get_drvdata(dev);
    struct sh_mobile_lcdc_overlay *ovl = info->par;

    return scnprintf(buf, PAGE_SIZE, "%u\n", ovl->rop3);
}

static ssize_t
overlay_rop3_store(struct device *dev, struct device_attribute *attr,
            const char *buf, size_t count)
{
    struct fb_info *info = dev_get_drvdata(dev);
    struct sh_mobile_lcdc_overlay *ovl = info->par;
    unsigned int rop3;
    char *endp;

    rop3 = !!simple_strtoul(buf, &endp, 10);
    if (isspace(*endp))
        endp++;

    if (endp - buf != count)
        return -EINVAL;

    if (rop3 > 255)
        return -EINVAL;

    if (ovl->rop3 != rop3) {
        ovl->rop3 = rop3;

        if (ovl->mode == LCDC_OVERLAY_ROP3 && ovl->enabled)
            sh_mobile_lcdc_overlay_setup(ovl);
    }

    return count;
}

static const struct device_attribute overlay_sysfs_attrs[] = {
    __ATTR(ovl_alpha, S_IRUGO|S_IWUSR,
           overlay_alpha_show, overlay_alpha_store),
    __ATTR(ovl_mode, S_IRUGO|S_IWUSR,
           overlay_mode_show, overlay_mode_store),
    __ATTR(ovl_position, S_IRUGO|S_IWUSR,
           overlay_position_show, overlay_position_store),
    __ATTR(ovl_rop3, S_IRUGO|S_IWUSR,
           overlay_rop3_show, overlay_rop3_store),
};

static const struct fb_fix_screeninfo sh_mobile_lcdc_overlay_fix  = {
    .id =       "SH Mobile LCDC",
    .type =     FB_TYPE_PACKED_PIXELS,
    .visual =   FB_VISUAL_TRUECOLOR,
    .accel =    FB_ACCEL_NONE,
    .xpanstep = 1,
    .ypanstep = 1,
    .ywrapstep =    0,
    .capabilities = FB_CAP_FOURCC,
};

static int sh_mobile_lcdc_overlay_pan(struct fb_var_screeninfo *var,
                    struct fb_info *info)
{
    struct sh_mobile_lcdc_overlay *ovl = info->par;
    unsigned long base_addr_y;
    unsigned long base_addr_c;
    unsigned long y_offset;
    unsigned long c_offset;

    if (!ovl->format->yuv) {
        y_offset = (var->yoffset * ovl->xres_virtual + var->xoffset)
             * ovl->format->bpp / 8;
        c_offset = 0;
    } else {
        unsigned int xsub = ovl->format->bpp < 24 ? 2 : 1;
        unsigned int ysub = ovl->format->bpp < 16 ? 2 : 1;

        y_offset = var->yoffset * ovl->xres_virtual + var->xoffset;
        c_offset = var->yoffset / ysub * ovl->xres_virtual * 2 / xsub
             + var->xoffset * 2 / xsub;
    }

    /* If the Y offset hasn't changed, the C offset hasn't either. There's
     * nothing to do in that case.
     */
    if (y_offset == ovl->pan_y_offset)
        return 0;

    /* Set the source address for the next refresh */
    base_addr_y = ovl->dma_handle + y_offset;
    base_addr_c = ovl->dma_handle + ovl->xres_virtual * ovl->yres_virtual
            + c_offset;

    ovl->base_addr_y = base_addr_y;
    ovl->base_addr_c = base_addr_c;
    ovl->pan_y_offset = y_offset;

    lcdc_write(ovl->channel->lcdc, LDBCR, LDBCR_UPC(ovl->index));

    lcdc_write_overlay(ovl, LDBnBSAYR(ovl->index), ovl->base_addr_y);
    lcdc_write_overlay(ovl, LDBnBSACR(ovl->index), ovl->base_addr_c);

    lcdc_write(ovl->channel->lcdc, LDBCR,
           LDBCR_UPF(ovl->index) | LDBCR_UPD(ovl->index));

    return 0;
}

static int sh_mobile_lcdc_overlay_ioctl(struct fb_info *info, unsigned int cmd,
                      unsigned long arg)
{
    struct sh_mobile_lcdc_overlay *ovl = info->par;

    switch (cmd) {
    case FBIO_WAITFORVSYNC:
        return sh_mobile_lcdc_wait_for_vsync(ovl->channel);

    default:
        return -ENOIOCTLCMD;
    }
}

static int sh_mobile_lcdc_overlay_check_var(struct fb_var_screeninfo *var,
                      struct fb_info *info)
{
    return __sh_mobile_lcdc_check_var(var, info);
}

static int sh_mobile_lcdc_overlay_set_par(struct fb_info *info)
{
    struct sh_mobile_lcdc_overlay *ovl = info->par;

    ovl->format =
        sh_mobile_format_info(sh_mobile_format_fourcc(&info->var));

    ovl->xres = info->var.xres;
    ovl->xres_virtual = info->var.xres_virtual;
    ovl->yres = info->var.yres;
    ovl->yres_virtual = info->var.yres_virtual;

    if (ovl->format->yuv)
        ovl->pitch = info->var.xres_virtual;
    else
        ovl->pitch = info->var.xres_virtual * ovl->format->bpp / 8;

    sh_mobile_lcdc_overlay_setup(ovl);

    info->fix.line_length = ovl->pitch;

    if (sh_mobile_format_is_fourcc(&info->var)) {
        info->fix.type = FB_TYPE_FOURCC;
        info->fix.visual = FB_VISUAL_FOURCC;
    } else {
        info->fix.type = FB_TYPE_PACKED_PIXELS;
        info->fix.visual = FB_VISUAL_TRUECOLOR;
    }

    return 0;
}

/* Overlay blanking. Disable the overlay when blanked. */
static int sh_mobile_lcdc_overlay_blank(int blank, struct fb_info *info)
{
    struct sh_mobile_lcdc_overlay *ovl = info->par;

    ovl->enabled = !blank;
    sh_mobile_lcdc_overlay_setup(ovl);

    /* Prevent the backlight from receiving a blanking event by returning
     * a non-zero value.
     */
    return 1;
}

static struct fb_ops sh_mobile_lcdc_overlay_ops = {
    .owner          = THIS_MODULE,
    .fb_read        = fb_sys_read,
    .fb_write       = fb_sys_write,
    .fb_fillrect    = sys_fillrect,
    .fb_copyarea    = sys_copyarea,
    .fb_imageblit   = sys_imageblit,
    .fb_blank   = sh_mobile_lcdc_overlay_blank,
    .fb_pan_display = sh_mobile_lcdc_overlay_pan,
    .fb_ioctl       = sh_mobile_lcdc_overlay_ioctl,
    .fb_check_var   = sh_mobile_lcdc_overlay_check_var,
    .fb_set_par = sh_mobile_lcdc_overlay_set_par,
};

static void
sh_mobile_lcdc_overlay_fb_unregister(struct sh_mobile_lcdc_overlay *ovl)
{
    struct fb_info *info = ovl->info;

    if (info == NULL || info->dev == NULL)
        return;

    unregister_framebuffer(ovl->info);
}

static int __devinit
sh_mobile_lcdc_overlay_fb_register(struct sh_mobile_lcdc_overlay *ovl)
{
    struct sh_mobile_lcdc_priv *lcdc = ovl->channel->lcdc;
    struct fb_info *info = ovl->info;
    unsigned int i;
    int ret;

    if (info == NULL)
        return 0;

    ret = register_framebuffer(info);
    if (ret < 0)
        return ret;

    dev_info(lcdc->dev, "registered %s/overlay %u as %dx%d %dbpp.\n",
         dev_name(lcdc->dev), ovl->index, info->var.xres,
         info->var.yres, info->var.bits_per_pixel);

    for (i = 0; i < ARRAY_SIZE(overlay_sysfs_attrs); ++i) {
        ret = device_create_file(info->dev, &overlay_sysfs_attrs[i]);
        if (ret < 0)
            return ret;
    }

    return 0;
}

static void
sh_mobile_lcdc_overlay_fb_cleanup(struct sh_mobile_lcdc_overlay *ovl)
{
    struct fb_info *info = ovl->info;

    if (info == NULL || info->device == NULL)
        return;

    framebuffer_release(info);
}

static int __devinit
sh_mobile_lcdc_overlay_fb_init(struct sh_mobile_lcdc_overlay *ovl)
{
    struct sh_mobile_lcdc_priv *priv = ovl->channel->lcdc;
    struct fb_var_screeninfo *var;
    struct fb_info *info;

    /* Allocate and initialize the frame buffer device. */
    info = framebuffer_alloc(0, priv->dev);
    if (info == NULL) {
        dev_err(priv->dev, "unable to allocate fb_info\n");
        return -ENOMEM;
    }

    ovl->info = info;

    info->flags = FBINFO_FLAG_DEFAULT;
    info->fbops = &sh_mobile_lcdc_overlay_ops;
    info->device = priv->dev;
    info->screen_base = ovl->fb_mem;
    info->par = ovl;

    /* Initialize fixed screen information. Restrict pan to 2 lines steps
     * for NV12 and NV21.
     */
    info->fix = sh_mobile_lcdc_overlay_fix;
    snprintf(info->fix.id, sizeof(info->fix.id),
         "SH Mobile LCDC Overlay %u", ovl->index);
    info->fix.smem_start = ovl->dma_handle;
    info->fix.smem_len = ovl->fb_size;
    info->fix.line_length = ovl->pitch;

    if (ovl->format->yuv)
        info->fix.visual = FB_VISUAL_FOURCC;
    else
        info->fix.visual = FB_VISUAL_TRUECOLOR;

    switch (ovl->format->fourcc) {
    case V4L2_PIX_FMT_NV12:
    case V4L2_PIX_FMT_NV21:
        info->fix.ypanstep = 2;
    case V4L2_PIX_FMT_NV16:
    case V4L2_PIX_FMT_NV61:
        info->fix.xpanstep = 2;
    }

    /* Initialize variable screen information. */
    var = &info->var;
    memset(var, 0, sizeof(*var));
    var->xres = ovl->xres;
    var->yres = ovl->yres;
    var->xres_virtual = ovl->xres_virtual;
    var->yres_virtual = ovl->yres_virtual;
    var->activate = FB_ACTIVATE_NOW;

    /* Use the legacy API by default for RGB formats, and the FOURCC API
     * for YUV formats.
     */
    if (!ovl->format->yuv)
        var->bits_per_pixel = ovl->format->bpp;
    else
        var->grayscale = ovl->format->fourcc;

    return sh_mobile_lcdc_overlay_check_var(var, info);
}

/* -----------------------------------------------------------------------------
 * Frame buffer operations - main frame buffer
 */

static int sh_mobile_lcdc_setcolreg(u_int regno,
                    u_int red, u_int green, u_int blue,
                    u_int transp, struct fb_info *info)
{
    u32 *palette = info->pseudo_palette;

    if (regno >= PALETTE_NR)
        return -EINVAL;

    /* only FB_VISUAL_TRUECOLOR supported */

    red >>= 16 - info->var.red.length;
    green >>= 16 - info->var.green.length;
    blue >>= 16 - info->var.blue.length;
    transp >>= 16 - info->var.transp.length;

    palette[regno] = (red << info->var.red.offset) |
      (green << info->var.green.offset) |
      (blue << info->var.blue.offset) |
      (transp << info->var.transp.offset);

    return 0;
}

static const struct fb_fix_screeninfo sh_mobile_lcdc_fix  = {
    .id =       "SH Mobile LCDC",
    .type =     FB_TYPE_PACKED_PIXELS,
    .visual =   FB_VISUAL_TRUECOLOR,
    .accel =    FB_ACCEL_NONE,
    .xpanstep = 1,
    .ypanstep = 1,
    .ywrapstep =    0,
    .capabilities = FB_CAP_FOURCC,
};

static void sh_mobile_lcdc_fillrect(struct fb_info *info,
                    const struct fb_fillrect *rect)
{
    sys_fillrect(info, rect);
    sh_mobile_lcdc_deferred_io_touch(info);
}

static void sh_mobile_lcdc_copyarea(struct fb_info *info,
                    const struct fb_copyarea *area)
{
    sys_copyarea(info, area);
    sh_mobile_lcdc_deferred_io_touch(info);
}

static void sh_mobile_lcdc_imageblit(struct fb_info *info,
                     const struct fb_image *image)
{
    sys_imageblit(info, image);
    sh_mobile_lcdc_deferred_io_touch(info);
}

static int sh_mobile_lcdc_pan(struct fb_var_screeninfo *var,
                  struct fb_info *info)
{
    struct sh_mobile_lcdc_chan *ch = info->par;
    struct sh_mobile_lcdc_priv *priv = ch->lcdc;
    unsigned long ldrcntr;
    unsigned long base_addr_y, base_addr_c;
    unsigned long y_offset;
    unsigned long c_offset;

    if (!ch->format->yuv) {
        y_offset = (var->yoffset * ch->xres_virtual + var->xoffset)
             * ch->format->bpp / 8;
        c_offset = 0;
    } else {
        unsigned int xsub = ch->format->bpp < 24 ? 2 : 1;
        unsigned int ysub = ch->format->bpp < 16 ? 2 : 1;

        y_offset = var->yoffset * ch->xres_virtual + var->xoffset;
        c_offset = var->yoffset / ysub * ch->xres_virtual * 2 / xsub
             + var->xoffset * 2 / xsub;
    }

    /* If the Y offset hasn't changed, the C offset hasn't either. There's
     * nothing to do in that case.
     */
    if (y_offset == ch->pan_y_offset)
        return 0;

    /* Set the source address for the next refresh */
    base_addr_y = ch->dma_handle + y_offset;
    base_addr_c = ch->dma_handle + ch->xres_virtual * ch->yres_virtual
            + c_offset;

    if (ch->cache)
        sh_mobile_meram_cache_update(priv->meram_dev, ch->cache,
                         base_addr_y, base_addr_c,
                         &base_addr_y, &base_addr_c);

    ch->base_addr_y = base_addr_y;
    ch->base_addr_c = base_addr_c;
    ch->pan_y_offset = y_offset;

    lcdc_write_chan_mirror(ch, LDSA1R, base_addr_y);
    if (ch->format->yuv)
        lcdc_write_chan_mirror(ch, LDSA2R, base_addr_c);

    ldrcntr = lcdc_read(priv, _LDRCNTR);
    if (lcdc_chan_is_sublcd(ch))
        lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_SRS);
    else
        lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_MRS);


    sh_mobile_lcdc_deferred_io_touch(info);

    return 0;
}

static int sh_mobile_lcdc_ioctl(struct fb_info *info, unsigned int cmd,
                unsigned long arg)
{
    struct sh_mobile_lcdc_chan *ch = info->par;
    int retval;

    switch (cmd) {
    case FBIO_WAITFORVSYNC:
        retval = sh_mobile_lcdc_wait_for_vsync(ch);
        break;

    default:
        retval = -ENOIOCTLCMD;
        break;
    }
    return retval;
}

static void sh_mobile_fb_reconfig(struct fb_info *info)
{
    struct sh_mobile_lcdc_chan *ch = info->par;
    struct fb_var_screeninfo var;
    struct fb_videomode mode;
    struct fb_event event;
    int evnt = FB_EVENT_MODE_CHANGE_ALL;

    if (ch->use_count > 1 || (ch->use_count == 1 && !info->fbcon_par))
        /* More framebuffer users are active */
        return;

    fb_var_to_videomode(&mode, &info->var);

    if (fb_mode_is_equal(&ch->display.mode, &mode))
        return;

    /* Display has been re-plugged, framebuffer is free now, reconfigure */
    var = info->var;
    fb_videomode_to_var(&var, &ch->display.mode);
    var.width = ch->display.width;
    var.height = ch->display.height;
    var.activate = FB_ACTIVATE_NOW;

    if (fb_set_var(info, &var) < 0)
        /* Couldn't reconfigure, hopefully, can continue as before */
        return;

    /*
     * fb_set_var() calls the notifier change internally, only if
     * FBINFO_MISC_USEREVENT flag is set. Since we do not want to fake a
     * user event, we have to call the chain ourselves.
     */
    event.info = info;
    event.data = &ch->display.mode;
    fb_notifier_call_chain(evnt, &event);
}

/*
 * Locking: both .fb_release() and .fb_open() are called with info->lock held if
 * user == 1, or with console sem held, if user == 0.
 */
static int sh_mobile_lcdc_release(struct fb_info *info, int user)
{
    struct sh_mobile_lcdc_chan *ch = info->par;

    mutex_lock(&ch->open_lock);
    dev_dbg(info->dev, "%s(): %d users\n", __func__, ch->use_count);

    ch->use_count--;

    /* Nothing to reconfigure, when called from fbcon */
    if (user) {
        console_lock();
        sh_mobile_fb_reconfig(info);
        console_unlock();
    }

    mutex_unlock(&ch->open_lock);

    return 0;
}

static int sh_mobile_lcdc_open(struct fb_info *info, int user)
{
    struct sh_mobile_lcdc_chan *ch = info->par;

    mutex_lock(&ch->open_lock);
    ch->use_count++;

    dev_dbg(info->dev, "%s(): %d users\n", __func__, ch->use_count);
    mutex_unlock(&ch->open_lock);

    return 0;
}

static int sh_mobile_lcdc_check_var(struct fb_var_screeninfo *var,
                    struct fb_info *info)
{
    struct sh_mobile_lcdc_chan *ch = info->par;
    struct sh_mobile_lcdc_priv *p = ch->lcdc;
    unsigned int best_dist = (unsigned int)-1;
    unsigned int best_xres = 0;
    unsigned int best_yres = 0;
    unsigned int i;
    int ret;

    /* If board code provides us with a list of available modes, make sure
     * we use one of them. Find the mode closest to the requested one. The
     * distance between two modes is defined as the size of the
     * non-overlapping parts of the two rectangles.
     */
    for (i = 0; i < ch->cfg->num_modes; ++i) {
        const struct fb_videomode *mode = &ch->cfg->lcd_modes[i];
        unsigned int dist;

        /* We can only round up. */
        if (var->xres > mode->xres || var->yres > mode->yres)
            continue;

        dist = var->xres * var->yres + mode->xres * mode->yres
             - 2 * min(var->xres, mode->xres)
             * min(var->yres, mode->yres);

        if (dist < best_dist) {
            best_xres = mode->xres;
            best_yres = mode->yres;
            best_dist = dist;
        }
    }

    /* If no available mode can be used, return an error. */
    if (ch->cfg->num_modes != 0) {
        if (best_dist == (unsigned int)-1)
            return -EINVAL;

        var->xres = best_xres;
        var->yres = best_yres;
    }

    ret = __sh_mobile_lcdc_check_var(var, info);
    if (ret < 0)
        return ret;

    /* only accept the forced_fourcc for dual channel configurations */
    if (p->forced_fourcc &&
        p->forced_fourcc != sh_mobile_format_fourcc(var))
        return -EINVAL;

    return 0;
}

static int sh_mobile_lcdc_set_par(struct fb_info *info)
{
    struct sh_mobile_lcdc_chan *ch = info->par;
    int ret;

    sh_mobile_lcdc_stop(ch->lcdc);

    ch->format = sh_mobile_format_info(sh_mobile_format_fourcc(&info->var));
    ch->colorspace = info->var.colorspace;

    ch->xres = info->var.xres;
    ch->xres_virtual = info->var.xres_virtual;
    ch->yres = info->var.yres;
    ch->yres_virtual = info->var.yres_virtual;

    if (ch->format->yuv)
        ch->pitch = info->var.xres_virtual;
    else
        ch->pitch = info->var.xres_virtual * ch->format->bpp / 8;

    ret = sh_mobile_lcdc_start(ch->lcdc);
    if (ret < 0)
        dev_err(info->dev, "%s: unable to restart LCDC\n", __func__);

    info->fix.line_length = ch->pitch;

    if (sh_mobile_format_is_fourcc(&info->var)) {
        info->fix.type = FB_TYPE_FOURCC;
        info->fix.visual = FB_VISUAL_FOURCC;
    } else {
        info->fix.type = FB_TYPE_PACKED_PIXELS;
        info->fix.visual = FB_VISUAL_TRUECOLOR;
    }

    return ret;
}

/*
 * Screen blanking. Behavior is as follows:
 * FB_BLANK_UNBLANK: screen unblanked, clocks enabled
 * FB_BLANK_NORMAL: screen blanked, clocks enabled
 * FB_BLANK_VSYNC,
 * FB_BLANK_HSYNC,
 * FB_BLANK_POWEROFF: screen blanked, clocks disabled
 */
static int sh_mobile_lcdc_blank(int blank, struct fb_info *info)
{
    struct sh_mobile_lcdc_chan *ch = info->par;
    struct sh_mobile_lcdc_priv *p = ch->lcdc;

    /* blank the screen? */
    if (blank > FB_BLANK_UNBLANK && ch->blank_status == FB_BLANK_UNBLANK) {
        struct fb_fillrect rect = {
            .width = ch->xres,
            .height = ch->yres,
        };
        sh_mobile_lcdc_fillrect(info, &rect);
    }
    /* turn clocks on? */
    if (blank <= FB_BLANK_NORMAL && ch->blank_status > FB_BLANK_NORMAL) {
        sh_mobile_lcdc_clk_on(p);
    }
    /* turn clocks off? */
    if (blank > FB_BLANK_NORMAL && ch->blank_status <= FB_BLANK_NORMAL) {
        /* make sure the screen is updated with the black fill before
         * switching the clocks off. one vsync is not enough since
         * blanking may occur in the middle of a refresh. deferred io
         * mode will reenable the clocks and update the screen in time,
         * so it does not need this. */
        if (!info->fbdefio) {
            sh_mobile_lcdc_wait_for_vsync(ch);
            sh_mobile_lcdc_wait_for_vsync(ch);
        }
        sh_mobile_lcdc_clk_off(p);
    }

    ch->blank_status = blank;
    return 0;
}

static struct fb_ops sh_mobile_lcdc_ops = {
    .owner          = THIS_MODULE,
    .fb_setcolreg   = sh_mobile_lcdc_setcolreg,
    .fb_read        = fb_sys_read,
    .fb_write       = fb_sys_write,
    .fb_fillrect    = sh_mobile_lcdc_fillrect,
    .fb_copyarea    = sh_mobile_lcdc_copyarea,
    .fb_imageblit   = sh_mobile_lcdc_imageblit,
    .fb_blank   = sh_mobile_lcdc_blank,
    .fb_pan_display = sh_mobile_lcdc_pan,
    .fb_ioctl       = sh_mobile_lcdc_ioctl,
    .fb_open    = sh_mobile_lcdc_open,
    .fb_release = sh_mobile_lcdc_release,
    .fb_check_var   = sh_mobile_lcdc_check_var,
    .fb_set_par = sh_mobile_lcdc_set_par,
};

static void
sh_mobile_lcdc_channel_fb_unregister(struct sh_mobile_lcdc_chan *ch)
{
    if (ch->info && ch->info->dev)
        unregister_framebuffer(ch->info);
}

static int __devinit
sh_mobile_lcdc_channel_fb_register(struct sh_mobile_lcdc_chan *ch)
{
    struct fb_info *info = ch->info;
    int ret;

    if (info->fbdefio) {
        ch->sglist = vmalloc(sizeof(struct scatterlist) *
                     ch->fb_size >> PAGE_SHIFT);
        if (!ch->sglist) {
            dev_err(ch->lcdc->dev, "cannot allocate sglist\n");
            return -ENOMEM;
        }
    }

    info->bl_dev = ch->bl;

    ret = register_framebuffer(info);
    if (ret < 0)
        return ret;

    dev_info(ch->lcdc->dev, "registered %s/%s as %dx%d %dbpp.\n",
         dev_name(ch->lcdc->dev), (ch->cfg->chan == LCDC_CHAN_MAINLCD) ?
         "mainlcd" : "sublcd", info->var.xres, info->var.yres,
         info->var.bits_per_pixel);

    /* deferred io mode: disable clock to save power */
    if (info->fbdefio || info->state == FBINFO_STATE_SUSPENDED)
        sh_mobile_lcdc_clk_off(ch->lcdc);

    return ret;
}

static void
sh_mobile_lcdc_channel_fb_cleanup(struct sh_mobile_lcdc_chan *ch)
{
    struct fb_info *info = ch->info;

    if (!info || !info->device)
        return;

    if (ch->sglist)
        vfree(ch->sglist);

    fb_dealloc_cmap(&info->cmap);
    framebuffer_release(info);
}

static int __devinit
sh_mobile_lcdc_channel_fb_init(struct sh_mobile_lcdc_chan *ch,
                   const struct fb_videomode *mode,
                   unsigned int num_modes)
{
    struct sh_mobile_lcdc_priv *priv = ch->lcdc;
    struct fb_var_screeninfo *var;
    struct fb_info *info;
    int ret;

    /* Allocate and initialize the frame buffer device. Create the modes
     * list and allocate the color map.
     */
    info = framebuffer_alloc(0, priv->dev);
    if (info == NULL) {
        dev_err(priv->dev, "unable to allocate fb_info\n");
        return -ENOMEM;
    }

    ch->info = info;

    info->flags = FBINFO_FLAG_DEFAULT;
    info->fbops = &sh_mobile_lcdc_ops;
    info->device = priv->dev;
    info->screen_base = ch->fb_mem;
    info->pseudo_palette = &ch->pseudo_palette;
    info->par = ch;

    fb_videomode_to_modelist(mode, num_modes, &info->modelist);

    ret = fb_alloc_cmap(&info->cmap, PALETTE_NR, 0);
    if (ret < 0) {
        dev_err(priv->dev, "unable to allocate cmap\n");
        return ret;
    }

    /* Initialize fixed screen information. Restrict pan to 2 lines steps
     * for NV12 and NV21.
     */
    info->fix = sh_mobile_lcdc_fix;
    info->fix.smem_start = ch->dma_handle;
    info->fix.smem_len = ch->fb_size;
    info->fix.line_length = ch->pitch;

    if (ch->format->yuv)
        info->fix.visual = FB_VISUAL_FOURCC;
    else
        info->fix.visual = FB_VISUAL_TRUECOLOR;

    switch (ch->format->fourcc) {
    case V4L2_PIX_FMT_NV12:
    case V4L2_PIX_FMT_NV21:
        info->fix.ypanstep = 2;
    case V4L2_PIX_FMT_NV16:
    case V4L2_PIX_FMT_NV61:
        info->fix.xpanstep = 2;
    }

    /* Initialize variable screen information using the first mode as
     * default.
     */
    var = &info->var;
    fb_videomode_to_var(var, mode);
    var->width = ch->cfg->panel_cfg.width;
    var->height = ch->cfg->panel_cfg.height;
    var->xres_virtual = ch->xres_virtual;
    var->yres_virtual = ch->yres_virtual;
    var->activate = FB_ACTIVATE_NOW;

    /* Use the legacy API by default for RGB formats, and the FOURCC API
     * for YUV formats.
     */
    if (!ch->format->yuv)
        var->bits_per_pixel = ch->format->bpp;
    else
        var->grayscale = ch->format->fourcc;

    ret = sh_mobile_lcdc_check_var(var, info);
    if (ret)
        return ret;

    return 0;
}

/* -----------------------------------------------------------------------------
 * Backlight
 */

static int sh_mobile_lcdc_update_bl(struct backlight_device *bdev)
{
    struct sh_mobile_lcdc_chan *ch = bl_get_data(bdev);
    int brightness = bdev->props.brightness;

    if (bdev->props.power != FB_BLANK_UNBLANK ||
        bdev->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
        brightness = 0;

    return ch->cfg->bl_info.set_brightness(brightness);
}

static int sh_mobile_lcdc_get_brightness(struct backlight_device *bdev)
{
    struct sh_mobile_lcdc_chan *ch = bl_get_data(bdev);

    return ch->cfg->bl_info.get_brightness();
}

static int sh_mobile_lcdc_check_fb(struct backlight_device *bdev,
                   struct fb_info *info)
{
    return (info->bl_dev == bdev);
}

static struct backlight_ops sh_mobile_lcdc_bl_ops = {
    .options    = BL_CORE_SUSPENDRESUME,
    .update_status  = sh_mobile_lcdc_update_bl,
    .get_brightness = sh_mobile_lcdc_get_brightness,
    .check_fb   = sh_mobile_lcdc_check_fb,
};

static struct backlight_device *sh_mobile_lcdc_bl_probe(struct device *parent,
                           struct sh_mobile_lcdc_chan *ch)
{
    struct backlight_device *bl;

    bl = backlight_device_register(ch->cfg->bl_info.name, parent, ch,
                       &sh_mobile_lcdc_bl_ops, NULL);
    if (IS_ERR(bl)) {
        dev_err(parent, "unable to register backlight device: %ld\n",
            PTR_ERR(bl));
        return NULL;
    }

    bl->props.max_brightness = ch->cfg->bl_info.max_brightness;
    bl->props.brightness = bl->props.max_brightness;
    backlight_update_status(bl);

    return bl;
}

static void sh_mobile_lcdc_bl_remove(struct backlight_device *bdev)
{
    backlight_device_unregister(bdev);
}

/* -----------------------------------------------------------------------------
 * Power management
 */

static int sh_mobile_lcdc_suspend(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);

    sh_mobile_lcdc_stop(platform_get_drvdata(pdev));
    return 0;
}

static int sh_mobile_lcdc_resume(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);

    return sh_mobile_lcdc_start(platform_get_drvdata(pdev));
}

static int sh_mobile_lcdc_runtime_suspend(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);

    /* turn off LCDC hardware */
    lcdc_write(priv, _LDCNT1R, 0);

    return 0;
}

static int sh_mobile_lcdc_runtime_resume(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);

    __sh_mobile_lcdc_start(priv);

    return 0;
}

static const struct dev_pm_ops sh_mobile_lcdc_dev_pm_ops = {
    .suspend = sh_mobile_lcdc_suspend,
    .resume = sh_mobile_lcdc_resume,
    .runtime_suspend = sh_mobile_lcdc_runtime_suspend,
    .runtime_resume = sh_mobile_lcdc_runtime_resume,
};

/* -----------------------------------------------------------------------------
 * Framebuffer notifier
 */

/* locking: called with info->lock held */
static int sh_mobile_lcdc_notify(struct notifier_block *nb,
                 unsigned long action, void *data)
{
    struct fb_event *event = data;
    struct fb_info *info = event->info;
    struct sh_mobile_lcdc_chan *ch = info->par;

    if (&ch->lcdc->notifier != nb)
        return NOTIFY_DONE;

    dev_dbg(info->dev, "%s(): action = %lu, data = %p\n",
        __func__, action, event->data);

    switch(action) {
    case FB_EVENT_SUSPEND:
        sh_mobile_lcdc_display_off(ch);
        sh_mobile_lcdc_stop(ch->lcdc);
        break;
    case FB_EVENT_RESUME:
        mutex_lock(&ch->open_lock);
        sh_mobile_fb_reconfig(info);
        mutex_unlock(&ch->open_lock);

        sh_mobile_lcdc_display_on(ch);
        sh_mobile_lcdc_start(ch->lcdc);
    }

    return NOTIFY_OK;
}

/* -----------------------------------------------------------------------------
 * Probe/remove and driver init/exit
 */

static const struct fb_videomode default_720p __devinitconst = {
    .name = "HDMI 720p",
    .xres = 1280,
    .yres = 720,

    .left_margin = 220,
    .right_margin = 110,
    .hsync_len = 40,

    .upper_margin = 20,
    .lower_margin = 5,
    .vsync_len = 5,

    .pixclock = 13468,
    .refresh = 60,
    .sync = FB_SYNC_VERT_HIGH_ACT | FB_SYNC_HOR_HIGH_ACT,
};

static int sh_mobile_lcdc_remove(struct platform_device *pdev)
{
    struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
    unsigned int i;

    fb_unregister_client(&priv->notifier);

    for (i = 0; i < ARRAY_SIZE(priv->overlays); i++)
        sh_mobile_lcdc_overlay_fb_unregister(&priv->overlays[i]);
    for (i = 0; i < ARRAY_SIZE(priv->ch); i++)
        sh_mobile_lcdc_channel_fb_unregister(&priv->ch[i]);

    sh_mobile_lcdc_stop(priv);

    for (i = 0; i < ARRAY_SIZE(priv->overlays); i++) {
        struct sh_mobile_lcdc_overlay *ovl = &priv->overlays[i];

        sh_mobile_lcdc_overlay_fb_cleanup(ovl);

        if (ovl->fb_mem)
            dma_free_coherent(&pdev->dev, ovl->fb_size,
                      ovl->fb_mem, ovl->dma_handle);
    }

    for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
        struct sh_mobile_lcdc_chan *ch = &priv->ch[i];

        if (ch->tx_dev) {
            ch->tx_dev->lcdc = NULL;
            module_put(ch->cfg->tx_dev->dev.driver->owner);
        }

        sh_mobile_lcdc_channel_fb_cleanup(ch);

        if (ch->fb_mem)
            dma_free_coherent(&pdev->dev, ch->fb_size,
                      ch->fb_mem, ch->dma_handle);
    }

    for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
        struct sh_mobile_lcdc_chan *ch = &priv->ch[i];

        if (ch->bl)
            sh_mobile_lcdc_bl_remove(ch->bl);
        mutex_destroy(&ch->open_lock);
    }

    if (priv->dot_clk) {
        pm_runtime_disable(&pdev->dev);
        clk_put(priv->dot_clk);
    }

    if (priv->base)
        iounmap(priv->base);

    if (priv->irq)
        free_irq(priv->irq, priv);
    kfree(priv);
    return 0;
}

static int __devinit sh_mobile_lcdc_check_interface(struct sh_mobile_lcdc_chan *ch)
{
    int interface_type = ch->cfg->interface_type;

    switch (interface_type) {
    case RGB8:
    case RGB9:
    case RGB12A:
    case RGB12B:
    case RGB16:
    case RGB18:
    case RGB24:
    case SYS8A:
    case SYS8B:
    case SYS8C:
    case SYS8D:
    case SYS9:
    case SYS12:
    case SYS16A:
    case SYS16B:
    case SYS16C:
    case SYS18:
    case SYS24:
        break;
    default:
        return -EINVAL;
    }

    /* SUBLCD only supports SYS interface */
    if (lcdc_chan_is_sublcd(ch)) {
        if (!(interface_type & LDMT1R_IFM))
            return -EINVAL;

        interface_type &= ~LDMT1R_IFM;
    }

    ch->ldmt1r_value = interface_type;
    return 0;
}

static int __devinit
sh_mobile_lcdc_overlay_init(struct sh_mobile_lcdc_priv *priv,
              struct sh_mobile_lcdc_overlay *ovl)
{
    const struct sh_mobile_lcdc_format_info *format;
    int ret;

    if (ovl->cfg->fourcc == 0)
        return 0;

    /* Validate the format. */
    format = sh_mobile_format_info(ovl->cfg->fourcc);
    if (format == NULL) {
        dev_err(priv->dev, "Invalid FOURCC %08x\n", ovl->cfg->fourcc);
        return -EINVAL;
    }

    ovl->enabled = false;
    ovl->mode = LCDC_OVERLAY_BLEND;
    ovl->alpha = 255;
    ovl->rop3 = 0;
    ovl->pos_x = 0;
    ovl->pos_y = 0;

    /* The default Y virtual resolution is twice the panel size to allow for
     * double-buffering.
     */
    ovl->format = format;
    ovl->xres = ovl->cfg->max_xres;
    ovl->xres_virtual = ovl->xres;
    ovl->yres = ovl->cfg->max_yres;
    ovl->yres_virtual = ovl->yres * 2;

    if (!format->yuv)
        ovl->pitch = ovl->xres_virtual * format->bpp / 8;
    else
        ovl->pitch = ovl->xres_virtual;

    /* Allocate frame buffer memory. */
    ovl->fb_size = ovl->cfg->max_xres * ovl->cfg->max_yres
               * format->bpp / 8 * 2;
    ovl->fb_mem = dma_alloc_coherent(priv->dev, ovl->fb_size,
                       &ovl->dma_handle, GFP_KERNEL);
    if (!ovl->fb_mem) {
        dev_err(priv->dev, "unable to allocate buffer\n");
        return -ENOMEM;
    }

    ret = sh_mobile_lcdc_overlay_fb_init(ovl);
    if (ret < 0)
        return ret;

    return 0;
}

static int __devinit
sh_mobile_lcdc_channel_init(struct sh_mobile_lcdc_priv *priv,
                struct sh_mobile_lcdc_chan *ch)
{
    const struct sh_mobile_lcdc_format_info *format;
    const struct sh_mobile_lcdc_chan_cfg *cfg = ch->cfg;
    const struct fb_videomode *max_mode;
    const struct fb_videomode *mode;
    unsigned int num_modes;
    unsigned int max_size;
    unsigned int i;

    mutex_init(&ch->open_lock);
    ch->notify = sh_mobile_lcdc_display_notify;

    /* Validate the format. */
    format = sh_mobile_format_info(cfg->fourcc);
    if (format == NULL) {
        dev_err(priv->dev, "Invalid FOURCC %08x.\n", cfg->fourcc);
        return -EINVAL;
    }

    /* Iterate through the modes to validate them and find the highest
     * resolution.
     */
    max_mode = NULL;
    max_size = 0;

    for (i = 0, mode = cfg->lcd_modes; i < cfg->num_modes; i++, mode++) {
        unsigned int size = mode->yres * mode->xres;

        /* NV12/NV21 buffers must have even number of lines */
        if ((cfg->fourcc == V4L2_PIX_FMT_NV12 ||
             cfg->fourcc == V4L2_PIX_FMT_NV21) && (mode->yres & 0x1)) {
            dev_err(priv->dev, "yres must be multiple of 2 for "
                "YCbCr420 mode.\n");
            return -EINVAL;
        }

        if (size > max_size) {
            max_mode = mode;
            max_size = size;
        }
    }

    if (!max_size)
        max_size = MAX_XRES * MAX_YRES;
    else
        dev_dbg(priv->dev, "Found largest videomode %ux%u\n",
            max_mode->xres, max_mode->yres);

    if (cfg->lcd_modes == NULL) {
        mode = &default_720p;
        num_modes = 1;
    } else {
        mode = cfg->lcd_modes;
        num_modes = cfg->num_modes;
    }

    /* Use the first mode as default. The default Y virtual resolution is
     * twice the panel size to allow for double-buffering.
     */
    ch->format = format;
    ch->xres = mode->xres;
    ch->xres_virtual = mode->xres;
    ch->yres = mode->yres;
    ch->yres_virtual = mode->yres * 2;

    if (!format->yuv) {
        ch->colorspace = V4L2_COLORSPACE_SRGB;
        ch->pitch = ch->xres_virtual * format->bpp / 8;
    } else {
        ch->colorspace = V4L2_COLORSPACE_REC709;
        ch->pitch = ch->xres_virtual;
    }

    ch->display.width = cfg->panel_cfg.width;
    ch->display.height = cfg->panel_cfg.height;
    ch->display.mode = *mode;

    /* Allocate frame buffer memory. */
    ch->fb_size = max_size * format->bpp / 8 * 2;
    ch->fb_mem = dma_alloc_coherent(priv->dev, ch->fb_size, &ch->dma_handle,
                    GFP_KERNEL);
    if (ch->fb_mem == NULL) {
        dev_err(priv->dev, "unable to allocate buffer\n");
        return -ENOMEM;
    }

    /* Initialize the transmitter device if present. */
    if (cfg->tx_dev) {
        if (!cfg->tx_dev->dev.driver ||
            !try_module_get(cfg->tx_dev->dev.driver->owner)) {
            dev_warn(priv->dev,
                 "unable to get transmitter device\n");
            return -EINVAL;
        }
        ch->tx_dev = platform_get_drvdata(cfg->tx_dev);
        ch->tx_dev->lcdc = ch;
        ch->tx_dev->def_mode = *mode;
    }

    return sh_mobile_lcdc_channel_fb_init(ch, mode, num_modes);
}

static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev)
{
    struct sh_mobile_lcdc_info *pdata = pdev->dev.platform_data;
    struct sh_mobile_lcdc_priv *priv;
    struct resource *res;
    int num_channels;
    int error;
    int i;

    if (!pdata) {
        dev_err(&pdev->dev, "no platform data defined\n");
        return -EINVAL;
    }

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    i = platform_get_irq(pdev, 0);
    if (!res || i < 0) {
        dev_err(&pdev->dev, "cannot get platform resources\n");
        return -ENOENT;
    }

    priv = kzalloc(sizeof(*priv), GFP_KERNEL);
    if (!priv) {
        dev_err(&pdev->dev, "cannot allocate device data\n");
        return -ENOMEM;
    }

    priv->dev = &pdev->dev;
    priv->meram_dev = pdata->meram_dev;
    platform_set_drvdata(pdev, priv);

    error = request_irq(i, sh_mobile_lcdc_irq, 0,
                dev_name(&pdev->dev), priv);
    if (error) {
        dev_err(&pdev->dev, "unable to request irq\n");
        goto err1;
    }

    priv->irq = i;
    atomic_set(&priv->hw_usecnt, -1);

    for (i = 0, num_channels = 0; i < ARRAY_SIZE(pdata->ch); i++) {
        struct sh_mobile_lcdc_chan *ch = priv->ch + num_channels;

        ch->lcdc = priv;
        ch->cfg = &pdata->ch[i];

        error = sh_mobile_lcdc_check_interface(ch);
        if (error) {
            dev_err(&pdev->dev, "unsupported interface type\n");
            goto err1;
        }
        init_waitqueue_head(&ch->frame_end_wait);
        init_completion(&ch->vsync_completion);

        /* probe the backlight is there is one defined */
        if (ch->cfg->bl_info.max_brightness)
            ch->bl = sh_mobile_lcdc_bl_probe(&pdev->dev, ch);

        switch (pdata->ch[i].chan) {
        case LCDC_CHAN_MAINLCD:
            ch->enabled = LDCNT2R_ME;
            ch->reg_offs = lcdc_offs_mainlcd;
            num_channels++;
            break;
        case LCDC_CHAN_SUBLCD:
            ch->enabled = LDCNT2R_SE;
            ch->reg_offs = lcdc_offs_sublcd;
            num_channels++;
            break;
        }
    }

    if (!num_channels) {
        dev_err(&pdev->dev, "no channels defined\n");
        error = -EINVAL;
        goto err1;
    }

    /* for dual channel LCDC (MAIN + SUB) force shared format setting */
    if (num_channels == 2)
        priv->forced_fourcc = pdata->ch[0].fourcc;

    priv->base = ioremap_nocache(res->start, resource_size(res));
    if (!priv->base)
        goto err1;

    error = sh_mobile_lcdc_setup_clocks(priv, pdata->clock_source);
    if (error) {
        dev_err(&pdev->dev, "unable to setup clocks\n");
        goto err1;
    }

    /* Enable runtime PM. */
    pm_runtime_enable(&pdev->dev);

    for (i = 0; i < num_channels; i++) {
        struct sh_mobile_lcdc_chan *ch = priv->ch + i;

        error = sh_mobile_lcdc_channel_init(priv, ch);
        if (error)
            goto err1;
    }

    for (i = 0; i < ARRAY_SIZE(pdata->overlays); i++) {
        struct sh_mobile_lcdc_overlay *ovl = &priv->overlays[i];

        ovl->cfg = &pdata->overlays[i];
        ovl->channel = &priv->ch[0];

        error = sh_mobile_lcdc_overlay_init(priv, ovl);
        if (error)
            goto err1;
    }

    error = sh_mobile_lcdc_start(priv);
    if (error) {
        dev_err(&pdev->dev, "unable to start hardware\n");
        goto err1;
    }

    for (i = 0; i < num_channels; i++) {
        struct sh_mobile_lcdc_chan *ch = priv->ch + i;

        error = sh_mobile_lcdc_channel_fb_register(ch);
        if (error)
            goto err1;
    }

    for (i = 0; i < ARRAY_SIZE(pdata->overlays); i++) {
        struct sh_mobile_lcdc_overlay *ovl = &priv->overlays[i];

        error = sh_mobile_lcdc_overlay_fb_register(ovl);
        if (error)
            goto err1;
    }

    /* Failure ignored */
    priv->notifier.notifier_call = sh_mobile_lcdc_notify;
    fb_register_client(&priv->notifier);

    return 0;
err1:
    sh_mobile_lcdc_remove(pdev);

    return error;
}

static struct platform_driver sh_mobile_lcdc_driver = {
    .driver     = {
        .name       = "sh_mobile_lcdc_fb",
        .owner      = THIS_MODULE,
        .pm     = &sh_mobile_lcdc_dev_pm_ops,
    },
    .probe      = sh_mobile_lcdc_probe,
    .remove     = sh_mobile_lcdc_remove,
};

module_platform_driver(sh_mobile_lcdc_driver);

MODULE_DESCRIPTION("SuperH Mobile LCDC Framebuffer driver");
MODULE_AUTHOR("Magnus Damm <[email protected]>");
MODULE_LICENSE("GPL v2");