s3c-fb.c

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/* linux/drivers/video/s3c-fb.c
 *
 * Copyright 2008 Openmoko Inc.
 * Copyright 2008-2010 Simtec Electronics
 *      Ben Dooks <[email protected]>
 *      http://armlinux.simtec.co.uk/
 *
 * Samsung SoC Framebuffer driver
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software FoundatIon.
*/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/fb.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/interrupt.h>
#include <linux/pm_runtime.h>

#include <video/samsung_fimd.h>
#include <mach/map.h>
#include <plat/fb.h>

/* This driver will export a number of framebuffer interfaces depending
 * on the configuration passed in via the platform data. Each fb instance
 * maps to a hardware window. Currently there is no support for runtime
 * setting of the alpha-blending functions that each window has, so only
 * window 0 is actually useful.
 *
 * Window 0 is treated specially, it is used for the basis of the LCD
 * output timings and as the control for the output power-down state.
*/

/* note, the previous use of <mach/regs-fb.h> to get platform specific data
 * has been replaced by using the platform device name to pick the correct
 * configuration data for the system.
*/

#ifdef CONFIG_FB_S3C_DEBUG_REGWRITE
#undef writel
#define writel(v, r) do { \
    pr_debug("%s: %08x => %p\n", __func__, (unsigned int)v, r); \
    __raw_writel(v, r); \
} while (0)
#endif /* FB_S3C_DEBUG_REGWRITE */

/* irq_flags bits */
#define S3C_FB_VSYNC_IRQ_EN 0

#define VSYNC_TIMEOUT_MSEC 50

struct s3c_fb;

#define VALID_BPP(x) (1 << ((x) - 1))

#define OSD_BASE(win, variant) ((variant).osd + ((win) * (variant).osd_stride))
#define VIDOSD_A(win, variant) (OSD_BASE(win, variant) + 0x00)
#define VIDOSD_B(win, variant) (OSD_BASE(win, variant) + 0x04)
#define VIDOSD_C(win, variant) (OSD_BASE(win, variant) + 0x08)
#define VIDOSD_D(win, variant) (OSD_BASE(win, variant) + 0x0C)

struct s3c_fb_variant {
    unsigned int    is_2443:1;
    unsigned short  nr_windows;
    unsigned int    vidtcon;
    unsigned short  wincon;
    unsigned short  winmap;
    unsigned short  keycon;
    unsigned short  buf_start;
    unsigned short  buf_end;
    unsigned short  buf_size;
    unsigned short  osd;
    unsigned short  osd_stride;
    unsigned short  palette[S3C_FB_MAX_WIN];

    unsigned int    has_prtcon:1;
    unsigned int    has_shadowcon:1;
    unsigned int    has_blendcon:1;
    unsigned int    has_clksel:1;
    unsigned int    has_fixvclk:1;
};

struct s3c_fb_win_variant {
    unsigned int    has_osd_c:1;
    unsigned int    has_osd_d:1;
    unsigned int    has_osd_alpha:1;
    unsigned int    palette_16bpp:1;
    unsigned short  osd_size_off;
    unsigned short  palette_sz;
    u32     valid_bpp;
};

struct s3c_fb_driverdata {
    struct s3c_fb_variant   variant;
    struct s3c_fb_win_variant *win[S3C_FB_MAX_WIN];
};

struct s3c_fb_palette {
    struct fb_bitfield  r;
    struct fb_bitfield  g;
    struct fb_bitfield  b;
    struct fb_bitfield  a;
};

struct s3c_fb_win {
    struct s3c_fb_pd_win    *windata;
    struct s3c_fb       *parent;
    struct fb_info      *fbinfo;
    struct s3c_fb_palette    palette;
    struct s3c_fb_win_variant variant;

    u32         *palette_buffer;
    u32          pseudo_palette[16];
    unsigned int         index;
};

struct s3c_fb_vsync {
    wait_queue_head_t   wait;
    unsigned int        count;
};

struct s3c_fb {
    spinlock_t      slock;
    struct device       *dev;
    struct clk      *bus_clk;
    struct clk      *lcd_clk;
    void __iomem        *regs;
    struct s3c_fb_variant    variant;

    unsigned char        enabled;
    bool             output_on;

    struct s3c_fb_platdata  *pdata;
    struct s3c_fb_win   *windows[S3C_FB_MAX_WIN];

    int          irq_no;
    unsigned long        irq_flags;
    struct s3c_fb_vsync  vsync_info;
};

static bool s3c_fb_validate_win_bpp(struct s3c_fb_win *win, unsigned int bpp)
{
    return win->variant.valid_bpp & VALID_BPP(bpp);
}

static int s3c_fb_check_var(struct fb_var_screeninfo *var,
                struct fb_info *info)
{
    struct s3c_fb_win *win = info->par;
    struct s3c_fb *sfb = win->parent;

    dev_dbg(sfb->dev, "checking parameters\n");

    var->xres_virtual = max(var->xres_virtual, var->xres);
    var->yres_virtual = max(var->yres_virtual, var->yres);

    if (!s3c_fb_validate_win_bpp(win, var->bits_per_pixel)) {
        dev_dbg(sfb->dev, "win %d: unsupported bpp %d\n",
            win->index, var->bits_per_pixel);
        return -EINVAL;
    }

    /* always ensure these are zero, for drop through cases below */
    var->transp.offset = 0;
    var->transp.length = 0;

    switch (var->bits_per_pixel) {
    case 1:
    case 2:
    case 4:
    case 8:
        if (sfb->variant.palette[win->index] != 0) {
            /* non palletised, A:1,R:2,G:3,B:2 mode */
            var->red.offset     = 4;
            var->green.offset   = 2;
            var->blue.offset    = 0;
            var->red.length     = 5;
            var->green.length   = 3;
            var->blue.length    = 2;
            var->transp.offset  = 7;
            var->transp.length  = 1;
        } else {
            var->red.offset = 0;
            var->red.length = var->bits_per_pixel;
            var->green  = var->red;
            var->blue   = var->red;
        }
        break;

    case 19:
        /* 666 with one bit alpha/transparency */
        var->transp.offset  = 18;
        var->transp.length  = 1;
    case 18:
        var->bits_per_pixel = 32;

        /* 666 format */
        var->red.offset     = 12;
        var->green.offset   = 6;
        var->blue.offset    = 0;
        var->red.length     = 6;
        var->green.length   = 6;
        var->blue.length    = 6;
        break;

    case 16:
        /* 16 bpp, 565 format */
        var->red.offset     = 11;
        var->green.offset   = 5;
        var->blue.offset    = 0;
        var->red.length     = 5;
        var->green.length   = 6;
        var->blue.length    = 5;
        break;

    case 32:
    case 28:
    case 25:
        var->transp.length  = var->bits_per_pixel - 24;
        var->transp.offset  = 24;
        /* drop through */
    case 24:
        /* our 24bpp is unpacked, so 32bpp */
        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;
        break;

    default:
        dev_err(sfb->dev, "invalid bpp\n");
    }

    dev_dbg(sfb->dev, "%s: verified parameters\n", __func__);
    return 0;
}

static int s3c_fb_calc_pixclk(struct s3c_fb *sfb, unsigned int pixclk)
{
    unsigned long clk;
    unsigned long long tmp;
    unsigned int result;

    if (sfb->variant.has_clksel)
        clk = clk_get_rate(sfb->bus_clk);
    else
        clk = clk_get_rate(sfb->lcd_clk);

    tmp = (unsigned long long)clk;
    tmp *= pixclk;

    do_div(tmp, 1000000000UL);
    result = (unsigned int)tmp / 1000;

    dev_dbg(sfb->dev, "pixclk=%u, clk=%lu, div=%d (%lu)\n",
        pixclk, clk, result, result ? clk / result : clk);

    return result;
}

static int s3c_fb_align_word(unsigned int bpp, unsigned int pix)
{
    int pix_per_word;

    if (bpp > 16)
        return pix;

    pix_per_word = (8 * 32) / bpp;
    return ALIGN(pix, pix_per_word);
}

static void vidosd_set_size(struct s3c_fb_win *win, u32 size)
{
    struct s3c_fb *sfb = win->parent;

    /* OSD can be set up if osd_size_off != 0 for this window */
    if (win->variant.osd_size_off)
        writel(size, sfb->regs + OSD_BASE(win->index, sfb->variant)
                + win->variant.osd_size_off);
}

static void vidosd_set_alpha(struct s3c_fb_win *win, u32 alpha)
{
    struct s3c_fb *sfb = win->parent;

    if (win->variant.has_osd_alpha)
        writel(alpha, sfb->regs + VIDOSD_C(win->index, sfb->variant));
}

static void shadow_protect_win(struct s3c_fb_win *win, bool protect)
{
    struct s3c_fb *sfb = win->parent;
    u32 reg;

    if (protect) {
        if (sfb->variant.has_prtcon) {
            writel(PRTCON_PROTECT, sfb->regs + PRTCON);
        } else if (sfb->variant.has_shadowcon) {
            reg = readl(sfb->regs + SHADOWCON);
            writel(reg | SHADOWCON_WINx_PROTECT(win->index),
                sfb->regs + SHADOWCON);
        }
    } else {
        if (sfb->variant.has_prtcon) {
            writel(0, sfb->regs + PRTCON);
        } else if (sfb->variant.has_shadowcon) {
            reg = readl(sfb->regs + SHADOWCON);
            writel(reg & ~SHADOWCON_WINx_PROTECT(win->index),
                sfb->regs + SHADOWCON);
        }
    }
}

static void s3c_fb_enable(struct s3c_fb *sfb, int enable)
{
    u32 vidcon0 = readl(sfb->regs + VIDCON0);

    if (enable && !sfb->output_on)
        pm_runtime_get_sync(sfb->dev);

    if (enable) {
        vidcon0 |= VIDCON0_ENVID | VIDCON0_ENVID_F;
    } else {
        /* see the note in the framebuffer datasheet about
         * why you cannot take both of these bits down at the
         * same time. */

        if (vidcon0 & VIDCON0_ENVID) {
            vidcon0 |= VIDCON0_ENVID;
            vidcon0 &= ~VIDCON0_ENVID_F;
        }
    }

    writel(vidcon0, sfb->regs + VIDCON0);

    if (!enable && sfb->output_on)
        pm_runtime_put_sync(sfb->dev);

    sfb->output_on = enable;
}

static int s3c_fb_set_par(struct fb_info *info)
{
    struct fb_var_screeninfo *var = &info->var;
    struct s3c_fb_win *win = info->par;
    struct s3c_fb *sfb = win->parent;
    void __iomem *regs = sfb->regs;
    void __iomem *buf = regs;
    int win_no = win->index;
    u32 alpha = 0;
    u32 data;
    u32 pagewidth;

    dev_dbg(sfb->dev, "setting framebuffer parameters\n");

    pm_runtime_get_sync(sfb->dev);

    shadow_protect_win(win, 1);

    switch (var->bits_per_pixel) {
    case 32:
    case 24:
    case 16:
    case 12:
        info->fix.visual = FB_VISUAL_TRUECOLOR;
        break;
    case 8:
        if (win->variant.palette_sz >= 256)
            info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
        else
            info->fix.visual = FB_VISUAL_TRUECOLOR;
        break;
    case 1:
        info->fix.visual = FB_VISUAL_MONO01;
        break;
    default:
        info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
        break;
    }

    info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;

    info->fix.xpanstep = info->var.xres_virtual > info->var.xres ? 1 : 0;
    info->fix.ypanstep = info->var.yres_virtual > info->var.yres ? 1 : 0;

    /* disable the window whilst we update it */
    writel(0, regs + WINCON(win_no));

    if (!sfb->output_on)
        s3c_fb_enable(sfb, 1);

    /* write the buffer address */

    /* start and end registers stride is 8 */
    buf = regs + win_no * 8;

    writel(info->fix.smem_start, buf + sfb->variant.buf_start);

    data = info->fix.smem_start + info->fix.line_length * var->yres;
    writel(data, buf + sfb->variant.buf_end);

    pagewidth = (var->xres * var->bits_per_pixel) >> 3;
    data = VIDW_BUF_SIZE_OFFSET(info->fix.line_length - pagewidth) |
           VIDW_BUF_SIZE_PAGEWIDTH(pagewidth) |
           VIDW_BUF_SIZE_OFFSET_E(info->fix.line_length - pagewidth) |
           VIDW_BUF_SIZE_PAGEWIDTH_E(pagewidth);
    writel(data, regs + sfb->variant.buf_size + (win_no * 4));

    /* write 'OSD' registers to control position of framebuffer */

    data = VIDOSDxA_TOPLEFT_X(0) | VIDOSDxA_TOPLEFT_Y(0) |
           VIDOSDxA_TOPLEFT_X_E(0) | VIDOSDxA_TOPLEFT_Y_E(0);
    writel(data, regs + VIDOSD_A(win_no, sfb->variant));

    data = VIDOSDxB_BOTRIGHT_X(s3c_fb_align_word(var->bits_per_pixel,
                             var->xres - 1)) |
           VIDOSDxB_BOTRIGHT_Y(var->yres - 1) |
           VIDOSDxB_BOTRIGHT_X_E(s3c_fb_align_word(var->bits_per_pixel,
                             var->xres - 1)) |
           VIDOSDxB_BOTRIGHT_Y_E(var->yres - 1);

    writel(data, regs + VIDOSD_B(win_no, sfb->variant));

    data = var->xres * var->yres;

    alpha = VIDISD14C_ALPHA1_R(0xf) |
        VIDISD14C_ALPHA1_G(0xf) |
        VIDISD14C_ALPHA1_B(0xf);

    vidosd_set_alpha(win, alpha);
    vidosd_set_size(win, data);

    /* Enable DMA channel for this window */
    if (sfb->variant.has_shadowcon) {
        data = readl(sfb->regs + SHADOWCON);
        data |= SHADOWCON_CHx_ENABLE(win_no);
        writel(data, sfb->regs + SHADOWCON);
    }

    data = WINCONx_ENWIN;
    sfb->enabled |= (1 << win->index);

    /* note, since we have to round up the bits-per-pixel, we end up
     * relying on the bitfield information for r/g/b/a to work out
     * exactly which mode of operation is intended. */

    switch (var->bits_per_pixel) {
    case 1:
        data |= WINCON0_BPPMODE_1BPP;
        data |= WINCONx_BITSWP;
        data |= WINCONx_BURSTLEN_4WORD;
        break;
    case 2:
        data |= WINCON0_BPPMODE_2BPP;
        data |= WINCONx_BITSWP;
        data |= WINCONx_BURSTLEN_8WORD;
        break;
    case 4:
        data |= WINCON0_BPPMODE_4BPP;
        data |= WINCONx_BITSWP;
        data |= WINCONx_BURSTLEN_8WORD;
        break;
    case 8:
        if (var->transp.length != 0)
            data |= WINCON1_BPPMODE_8BPP_1232;
        else
            data |= WINCON0_BPPMODE_8BPP_PALETTE;
        data |= WINCONx_BURSTLEN_8WORD;
        data |= WINCONx_BYTSWP;
        break;
    case 16:
        if (var->transp.length != 0)
            data |= WINCON1_BPPMODE_16BPP_A1555;
        else
            data |= WINCON0_BPPMODE_16BPP_565;
        data |= WINCONx_HAWSWP;
        data |= WINCONx_BURSTLEN_16WORD;
        break;
    case 24:
    case 32:
        if (var->red.length == 6) {
            if (var->transp.length != 0)
                data |= WINCON1_BPPMODE_19BPP_A1666;
            else
                data |= WINCON1_BPPMODE_18BPP_666;
        } else if (var->transp.length == 1)
            data |= WINCON1_BPPMODE_25BPP_A1888
                | WINCON1_BLD_PIX;
        else if ((var->transp.length == 4) ||
            (var->transp.length == 8))
            data |= WINCON1_BPPMODE_28BPP_A4888
                | WINCON1_BLD_PIX | WINCON1_ALPHA_SEL;
        else
            data |= WINCON0_BPPMODE_24BPP_888;

        data |= WINCONx_WSWP;
        data |= WINCONx_BURSTLEN_16WORD;
        break;
    }

    /* Enable the colour keying for the window below this one */
    if (win_no > 0) {
        u32 keycon0_data = 0, keycon1_data = 0;
        void __iomem *keycon = regs + sfb->variant.keycon;

        keycon0_data = ~(WxKEYCON0_KEYBL_EN |
                WxKEYCON0_KEYEN_F |
                WxKEYCON0_DIRCON) | WxKEYCON0_COMPKEY(0);

        keycon1_data = WxKEYCON1_COLVAL(0xffffff);

        keycon += (win_no - 1) * 8;

        writel(keycon0_data, keycon + WKEYCON0);
        writel(keycon1_data, keycon + WKEYCON1);
    }

    writel(data, regs + sfb->variant.wincon + (win_no * 4));
    writel(0x0, regs + sfb->variant.winmap + (win_no * 4));

    /* Set alpha value width */
    if (sfb->variant.has_blendcon) {
        data = readl(sfb->regs + BLENDCON);
        data &= ~BLENDCON_NEW_MASK;
        if (var->transp.length > 4)
            data |= BLENDCON_NEW_8BIT_ALPHA_VALUE;
        else
            data |= BLENDCON_NEW_4BIT_ALPHA_VALUE;
        writel(data, sfb->regs + BLENDCON);
    }

    shadow_protect_win(win, 0);

    pm_runtime_put_sync(sfb->dev);

    return 0;
}

static void s3c_fb_update_palette(struct s3c_fb *sfb,
                  struct s3c_fb_win *win,
                  unsigned int reg,
                  u32 value)
{
    void __iomem *palreg;
    u32 palcon;

    palreg = sfb->regs + sfb->variant.palette[win->index];

    dev_dbg(sfb->dev, "%s: win %d, reg %d (%p): %08x\n",
        __func__, win->index, reg, palreg, value);

    win->palette_buffer[reg] = value;

    palcon = readl(sfb->regs + WPALCON);
    writel(palcon | WPALCON_PAL_UPDATE, sfb->regs + WPALCON);

    if (win->variant.palette_16bpp)
        writew(value, palreg + (reg * 2));
    else
        writel(value, palreg + (reg * 4));

    writel(palcon, sfb->regs + WPALCON);
}

static inline unsigned int chan_to_field(unsigned int chan,
                     struct fb_bitfield *bf)
{
    chan &= 0xffff;
    chan >>= 16 - bf->length;
    return chan << bf->offset;
}

static int s3c_fb_setcolreg(unsigned regno,
                unsigned red, unsigned green, unsigned blue,
                unsigned transp, struct fb_info *info)
{
    struct s3c_fb_win *win = info->par;
    struct s3c_fb *sfb = win->parent;
    unsigned int val;

    dev_dbg(sfb->dev, "%s: win %d: %d => rgb=%d/%d/%d\n",
        __func__, win->index, regno, red, green, blue);

    pm_runtime_get_sync(sfb->dev);

    switch (info->fix.visual) {
    case FB_VISUAL_TRUECOLOR:
        /* true-colour, use pseudo-palette */

        if (regno < 16) {
            u32 *pal = info->pseudo_palette;

            val  = chan_to_field(red,   &info->var.red);
            val |= chan_to_field(green, &info->var.green);
            val |= chan_to_field(blue,  &info->var.blue);

            pal[regno] = val;
        }
        break;

    case FB_VISUAL_PSEUDOCOLOR:
        if (regno < win->variant.palette_sz) {
            val  = chan_to_field(red, &win->palette.r);
            val |= chan_to_field(green, &win->palette.g);
            val |= chan_to_field(blue, &win->palette.b);

            s3c_fb_update_palette(sfb, win, regno, val);
        }

        break;

    default:
        pm_runtime_put_sync(sfb->dev);
        return 1;   /* unknown type */
    }

    pm_runtime_put_sync(sfb->dev);
    return 0;
}

static int s3c_fb_blank(int blank_mode, struct fb_info *info)
{
    struct s3c_fb_win *win = info->par;
    struct s3c_fb *sfb = win->parent;
    unsigned int index = win->index;
    u32 wincon;
    u32 output_on = sfb->output_on;

    dev_dbg(sfb->dev, "blank mode %d\n", blank_mode);

    pm_runtime_get_sync(sfb->dev);

    wincon = readl(sfb->regs + sfb->variant.wincon + (index * 4));

    switch (blank_mode) {
    case FB_BLANK_POWERDOWN:
        wincon &= ~WINCONx_ENWIN;
        sfb->enabled &= ~(1 << index);
        /* fall through to FB_BLANK_NORMAL */

    case FB_BLANK_NORMAL:
        /* disable the DMA and display 0x0 (black) */
        shadow_protect_win(win, 1);
        writel(WINxMAP_MAP | WINxMAP_MAP_COLOUR(0x0),
               sfb->regs + sfb->variant.winmap + (index * 4));
        shadow_protect_win(win, 0);
        break;

    case FB_BLANK_UNBLANK:
        shadow_protect_win(win, 1);
        writel(0x0, sfb->regs + sfb->variant.winmap + (index * 4));
        shadow_protect_win(win, 0);
        wincon |= WINCONx_ENWIN;
        sfb->enabled |= (1 << index);
        break;

    case FB_BLANK_VSYNC_SUSPEND:
    case FB_BLANK_HSYNC_SUSPEND:
    default:
        pm_runtime_put_sync(sfb->dev);
        return 1;
    }

    shadow_protect_win(win, 1);
    writel(wincon, sfb->regs + sfb->variant.wincon + (index * 4));

    /* Check the enabled state to see if we need to be running the
     * main LCD interface, as if there are no active windows then
     * it is highly likely that we also do not need to output
     * anything.
     */
    s3c_fb_enable(sfb, sfb->enabled ? 1 : 0);
    shadow_protect_win(win, 0);

    pm_runtime_put_sync(sfb->dev);

    return output_on == sfb->output_on;
}

static int s3c_fb_pan_display(struct fb_var_screeninfo *var,
                  struct fb_info *info)
{
    struct s3c_fb_win *win  = info->par;
    struct s3c_fb *sfb  = win->parent;
    void __iomem *buf   = sfb->regs + win->index * 8;
    unsigned int start_boff, end_boff;

    pm_runtime_get_sync(sfb->dev);

    /* Offset in bytes to the start of the displayed area */
    start_boff = var->yoffset * info->fix.line_length;
    /* X offset depends on the current bpp */
    if (info->var.bits_per_pixel >= 8) {
        start_boff += var->xoffset * (info->var.bits_per_pixel >> 3);
    } else {
        switch (info->var.bits_per_pixel) {
        case 4:
            start_boff += var->xoffset >> 1;
            break;
        case 2:
            start_boff += var->xoffset >> 2;
            break;
        case 1:
            start_boff += var->xoffset >> 3;
            break;
        default:
            dev_err(sfb->dev, "invalid bpp\n");
            pm_runtime_put_sync(sfb->dev);
            return -EINVAL;
        }
    }
    /* Offset in bytes to the end of the displayed area */
    end_boff = start_boff + info->var.yres * info->fix.line_length;

    /* Temporarily turn off per-vsync update from shadow registers until
     * both start and end addresses are updated to prevent corruption */
    shadow_protect_win(win, 1);

    writel(info->fix.smem_start + start_boff, buf + sfb->variant.buf_start);
    writel(info->fix.smem_start + end_boff, buf + sfb->variant.buf_end);

    shadow_protect_win(win, 0);

    pm_runtime_put_sync(sfb->dev);
    return 0;
}

static void s3c_fb_enable_irq(struct s3c_fb *sfb)
{
    void __iomem *regs = sfb->regs;
    u32 irq_ctrl_reg;

    if (!test_and_set_bit(S3C_FB_VSYNC_IRQ_EN, &sfb->irq_flags)) {
        /* IRQ disabled, enable it */
        irq_ctrl_reg = readl(regs + VIDINTCON0);

        irq_ctrl_reg |= VIDINTCON0_INT_ENABLE;
        irq_ctrl_reg |= VIDINTCON0_INT_FRAME;

        irq_ctrl_reg &= ~VIDINTCON0_FRAMESEL0_MASK;
        irq_ctrl_reg |= VIDINTCON0_FRAMESEL0_VSYNC;
        irq_ctrl_reg &= ~VIDINTCON0_FRAMESEL1_MASK;
        irq_ctrl_reg |= VIDINTCON0_FRAMESEL1_NONE;

        writel(irq_ctrl_reg, regs + VIDINTCON0);
    }
}

static void s3c_fb_disable_irq(struct s3c_fb *sfb)
{
    void __iomem *regs = sfb->regs;
    u32 irq_ctrl_reg;

    if (test_and_clear_bit(S3C_FB_VSYNC_IRQ_EN, &sfb->irq_flags)) {
        /* IRQ enabled, disable it */
        irq_ctrl_reg = readl(regs + VIDINTCON0);

        irq_ctrl_reg &= ~VIDINTCON0_INT_FRAME;
        irq_ctrl_reg &= ~VIDINTCON0_INT_ENABLE;

        writel(irq_ctrl_reg, regs + VIDINTCON0);
    }
}

static irqreturn_t s3c_fb_irq(int irq, void *dev_id)
{
    struct s3c_fb *sfb = dev_id;
    void __iomem  *regs = sfb->regs;
    u32 irq_sts_reg;

    spin_lock(&sfb->slock);

    irq_sts_reg = readl(regs + VIDINTCON1);

    if (irq_sts_reg & VIDINTCON1_INT_FRAME) {

        /* VSYNC interrupt, accept it */
        writel(VIDINTCON1_INT_FRAME, regs + VIDINTCON1);

        sfb->vsync_info.count++;
        wake_up_interruptible(&sfb->vsync_info.wait);
    }

    /* We only support waiting for VSYNC for now, so it's safe
     * to always disable irqs here.
     */
    s3c_fb_disable_irq(sfb);

    spin_unlock(&sfb->slock);
    return IRQ_HANDLED;
}

static int s3c_fb_wait_for_vsync(struct s3c_fb *sfb, u32 crtc)
{
    unsigned long count;
    int ret;

    if (crtc != 0)
        return -ENODEV;

    pm_runtime_get_sync(sfb->dev);

    count = sfb->vsync_info.count;
    s3c_fb_enable_irq(sfb);
    ret = wait_event_interruptible_timeout(sfb->vsync_info.wait,
                       count != sfb->vsync_info.count,
                       msecs_to_jiffies(VSYNC_TIMEOUT_MSEC));

    pm_runtime_put_sync(sfb->dev);

    if (ret == 0)
        return -ETIMEDOUT;

    return 0;
}

static int s3c_fb_ioctl(struct fb_info *info, unsigned int cmd,
            unsigned long arg)
{
    struct s3c_fb_win *win = info->par;
    struct s3c_fb *sfb = win->parent;
    int ret;
    u32 crtc;

    switch (cmd) {
    case FBIO_WAITFORVSYNC:
        if (get_user(crtc, (u32 __user *)arg)) {
            ret = -EFAULT;
            break;
        }

        ret = s3c_fb_wait_for_vsync(sfb, crtc);
        break;
    default:
        ret = -ENOTTY;
    }

    return ret;
}

static struct fb_ops s3c_fb_ops = {
    .owner      = THIS_MODULE,
    .fb_check_var   = s3c_fb_check_var,
    .fb_set_par = s3c_fb_set_par,
    .fb_blank   = s3c_fb_blank,
    .fb_setcolreg   = s3c_fb_setcolreg,
    .fb_fillrect    = cfb_fillrect,
    .fb_copyarea    = cfb_copyarea,
    .fb_imageblit   = cfb_imageblit,
    .fb_pan_display = s3c_fb_pan_display,
    .fb_ioctl   = s3c_fb_ioctl,
};

static void s3c_fb_missing_pixclock(struct fb_videomode *mode)
{
    u64 pixclk = 1000000000000ULL;
    u32 div;

    div  = mode->left_margin + mode->hsync_len + mode->right_margin +
           mode->xres;
    div *= mode->upper_margin + mode->vsync_len + mode->lower_margin +
           mode->yres;
    div *= mode->refresh ? : 60;

    do_div(pixclk, div);

    mode->pixclock = pixclk;
}

static int __devinit s3c_fb_alloc_memory(struct s3c_fb *sfb,
                     struct s3c_fb_win *win)
{
    struct s3c_fb_pd_win *windata = win->windata;
    unsigned int real_size, virt_size, size;
    struct fb_info *fbi = win->fbinfo;
    dma_addr_t map_dma;

    dev_dbg(sfb->dev, "allocating memory for display\n");

    real_size = windata->xres * windata->yres;
    virt_size = windata->virtual_x * windata->virtual_y;

    dev_dbg(sfb->dev, "real_size=%u (%u.%u), virt_size=%u (%u.%u)\n",
        real_size, windata->xres, windata->yres,
        virt_size, windata->virtual_x, windata->virtual_y);

    size = (real_size > virt_size) ? real_size : virt_size;
    size *= (windata->max_bpp > 16) ? 32 : windata->max_bpp;
    size /= 8;

    fbi->fix.smem_len = size;
    size = PAGE_ALIGN(size);

    dev_dbg(sfb->dev, "want %u bytes for window\n", size);

    fbi->screen_base = dma_alloc_writecombine(sfb->dev, size,
                          &map_dma, GFP_KERNEL);
    if (!fbi->screen_base)
        return -ENOMEM;

    dev_dbg(sfb->dev, "mapped %x to %p\n",
        (unsigned int)map_dma, fbi->screen_base);

    memset(fbi->screen_base, 0x0, size);
    fbi->fix.smem_start = map_dma;

    return 0;
}

static void s3c_fb_free_memory(struct s3c_fb *sfb, struct s3c_fb_win *win)
{
    struct fb_info *fbi = win->fbinfo;

    if (fbi->screen_base)
        dma_free_writecombine(sfb->dev, PAGE_ALIGN(fbi->fix.smem_len),
                  fbi->screen_base, fbi->fix.smem_start);
}

static void s3c_fb_release_win(struct s3c_fb *sfb, struct s3c_fb_win *win)
{
    u32 data;

    if (win->fbinfo) {
        if (sfb->variant.has_shadowcon) {
            data = readl(sfb->regs + SHADOWCON);
            data &= ~SHADOWCON_CHx_ENABLE(win->index);
            data &= ~SHADOWCON_CHx_LOCAL_ENABLE(win->index);
            writel(data, sfb->regs + SHADOWCON);
        }
        unregister_framebuffer(win->fbinfo);
        if (win->fbinfo->cmap.len)
            fb_dealloc_cmap(&win->fbinfo->cmap);
        s3c_fb_free_memory(sfb, win);
        framebuffer_release(win->fbinfo);
    }
}

static int __devinit s3c_fb_probe_win(struct s3c_fb *sfb, unsigned int win_no,
                      struct s3c_fb_win_variant *variant,
                      struct s3c_fb_win **res)
{
    struct fb_var_screeninfo *var;
    struct fb_videomode initmode;
    struct s3c_fb_pd_win *windata;
    struct s3c_fb_win *win;
    struct fb_info *fbinfo;
    int palette_size;
    int ret;

    dev_dbg(sfb->dev, "probing window %d, variant %p\n", win_no, variant);

    init_waitqueue_head(&sfb->vsync_info.wait);

    palette_size = variant->palette_sz * 4;

    fbinfo = framebuffer_alloc(sizeof(struct s3c_fb_win) +
                   palette_size * sizeof(u32), sfb->dev);
    if (!fbinfo) {
        dev_err(sfb->dev, "failed to allocate framebuffer\n");
        return -ENOENT;
    }

    windata = sfb->pdata->win[win_no];
    initmode = *sfb->pdata->vtiming;

    WARN_ON(windata->max_bpp == 0);
    WARN_ON(windata->xres == 0);
    WARN_ON(windata->yres == 0);

    win = fbinfo->par;
    *res = win;
    var = &fbinfo->var;
    win->variant = *variant;
    win->fbinfo = fbinfo;
    win->parent = sfb;
    win->windata = windata;
    win->index = win_no;
    win->palette_buffer = (u32 *)(win + 1);

    ret = s3c_fb_alloc_memory(sfb, win);
    if (ret) {
        dev_err(sfb->dev, "failed to allocate display memory\n");
        return ret;
    }

    /* setup the r/b/g positions for the window's palette */
    if (win->variant.palette_16bpp) {
        /* Set RGB 5:6:5 as default */
        win->palette.r.offset = 11;
        win->palette.r.length = 5;
        win->palette.g.offset = 5;
        win->palette.g.length = 6;
        win->palette.b.offset = 0;
        win->palette.b.length = 5;

    } else {
        /* Set 8bpp or 8bpp and 1bit alpha */
        win->palette.r.offset = 16;
        win->palette.r.length = 8;
        win->palette.g.offset = 8;
        win->palette.g.length = 8;
        win->palette.b.offset = 0;
        win->palette.b.length = 8;
    }

    /* setup the initial video mode from the window */
    initmode.xres = windata->xres;
    initmode.yres = windata->yres;
    fb_videomode_to_var(&fbinfo->var, &initmode);

    fbinfo->fix.type    = FB_TYPE_PACKED_PIXELS;
    fbinfo->fix.accel   = FB_ACCEL_NONE;
    fbinfo->var.activate    = FB_ACTIVATE_NOW;
    fbinfo->var.vmode   = FB_VMODE_NONINTERLACED;
    fbinfo->var.bits_per_pixel = windata->default_bpp;
    fbinfo->fbops       = &s3c_fb_ops;
    fbinfo->flags       = FBINFO_FLAG_DEFAULT;
    fbinfo->pseudo_palette  = &win->pseudo_palette;

    /* prepare to actually start the framebuffer */

    ret = s3c_fb_check_var(&fbinfo->var, fbinfo);
    if (ret < 0) {
        dev_err(sfb->dev, "check_var failed on initial video params\n");
        return ret;
    }

    /* create initial colour map */

    ret = fb_alloc_cmap(&fbinfo->cmap, win->variant.palette_sz, 1);
    if (ret == 0)
        fb_set_cmap(&fbinfo->cmap, fbinfo);
    else
        dev_err(sfb->dev, "failed to allocate fb cmap\n");

    s3c_fb_set_par(fbinfo);

    dev_dbg(sfb->dev, "about to register framebuffer\n");

    /* run the check_var and set_par on our configuration. */

    ret = register_framebuffer(fbinfo);
    if (ret < 0) {
        dev_err(sfb->dev, "failed to register framebuffer\n");
        return ret;
    }

    dev_info(sfb->dev, "window %d: fb %s\n", win_no, fbinfo->fix.id);

    return 0;
}

static void s3c_fb_set_rgb_timing(struct s3c_fb *sfb)
{
    struct fb_videomode *vmode = sfb->pdata->vtiming;
    void __iomem *regs = sfb->regs;
    int clkdiv;
    u32 data;

    if (!vmode->pixclock)
        s3c_fb_missing_pixclock(vmode);

    clkdiv = s3c_fb_calc_pixclk(sfb, vmode->pixclock);

    data = sfb->pdata->vidcon0;
    data &= ~(VIDCON0_CLKVAL_F_MASK | VIDCON0_CLKDIR);

    if (clkdiv > 1)
        data |= VIDCON0_CLKVAL_F(clkdiv-1) | VIDCON0_CLKDIR;
    else
        data &= ~VIDCON0_CLKDIR;    /* 1:1 clock */

    if (sfb->variant.is_2443)
        data |= (1 << 5);
    writel(data, regs + VIDCON0);

    data = VIDTCON0_VBPD(vmode->upper_margin - 1) |
           VIDTCON0_VFPD(vmode->lower_margin - 1) |
           VIDTCON0_VSPW(vmode->vsync_len - 1);
    writel(data, regs + sfb->variant.vidtcon);

    data = VIDTCON1_HBPD(vmode->left_margin - 1) |
           VIDTCON1_HFPD(vmode->right_margin - 1) |
           VIDTCON1_HSPW(vmode->hsync_len - 1);
    writel(data, regs + sfb->variant.vidtcon + 4);

    data = VIDTCON2_LINEVAL(vmode->yres - 1) |
           VIDTCON2_HOZVAL(vmode->xres - 1) |
           VIDTCON2_LINEVAL_E(vmode->yres - 1) |
           VIDTCON2_HOZVAL_E(vmode->xres - 1);
    writel(data, regs + sfb->variant.vidtcon + 8);
}

static void s3c_fb_clear_win(struct s3c_fb *sfb, int win)
{
    void __iomem *regs = sfb->regs;
    u32 reg;

    writel(0, regs + sfb->variant.wincon + (win * 4));
    writel(0, regs + VIDOSD_A(win, sfb->variant));
    writel(0, regs + VIDOSD_B(win, sfb->variant));
    writel(0, regs + VIDOSD_C(win, sfb->variant));

    if (sfb->variant.has_shadowcon) {
        reg = readl(sfb->regs + SHADOWCON);
        reg &= ~(SHADOWCON_WINx_PROTECT(win) |
            SHADOWCON_CHx_ENABLE(win) |
            SHADOWCON_CHx_LOCAL_ENABLE(win));
        writel(reg, sfb->regs + SHADOWCON);
    }
}

static int __devinit s3c_fb_probe(struct platform_device *pdev)
{
    const struct platform_device_id *platid;
    struct s3c_fb_driverdata *fbdrv;
    struct device *dev = &pdev->dev;
    struct s3c_fb_platdata *pd;
    struct s3c_fb *sfb;
    struct resource *res;
    int win;
    int ret = 0;
    u32 reg;

    platid = platform_get_device_id(pdev);
    fbdrv = (struct s3c_fb_driverdata *)platid->driver_data;

    if (fbdrv->variant.nr_windows > S3C_FB_MAX_WIN) {
        dev_err(dev, "too many windows, cannot attach\n");
        return -EINVAL;
    }

    pd = pdev->dev.platform_data;
    if (!pd) {
        dev_err(dev, "no platform data specified\n");
        return -EINVAL;
    }

    sfb = devm_kzalloc(dev, sizeof(struct s3c_fb), GFP_KERNEL);
    if (!sfb) {
        dev_err(dev, "no memory for framebuffers\n");
        return -ENOMEM;
    }

    dev_dbg(dev, "allocate new framebuffer %p\n", sfb);

    sfb->dev = dev;
    sfb->pdata = pd;
    sfb->variant = fbdrv->variant;

    spin_lock_init(&sfb->slock);

    sfb->bus_clk = devm_clk_get(dev, "lcd");
    if (IS_ERR(sfb->bus_clk)) {
        dev_err(dev, "failed to get bus clock\n");
        return PTR_ERR(sfb->bus_clk);
    }

    clk_prepare_enable(sfb->bus_clk);

    if (!sfb->variant.has_clksel) {
        sfb->lcd_clk = devm_clk_get(dev, "sclk_fimd");
        if (IS_ERR(sfb->lcd_clk)) {
            dev_err(dev, "failed to get lcd clock\n");
            ret = PTR_ERR(sfb->lcd_clk);
            goto err_bus_clk;
        }

        clk_prepare_enable(sfb->lcd_clk);
    }

    pm_runtime_enable(sfb->dev);

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    sfb->regs = devm_request_and_ioremap(dev, res);
    if (!sfb->regs) {
        dev_err(dev, "failed to map registers\n");
        ret = -ENXIO;
        goto err_lcd_clk;
    }

    res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
    if (!res) {
        dev_err(dev, "failed to acquire irq resource\n");
        ret = -ENOENT;
        goto err_lcd_clk;
    }
    sfb->irq_no = res->start;
    ret = devm_request_irq(dev, sfb->irq_no, s3c_fb_irq,
              0, "s3c_fb", sfb);
    if (ret) {
        dev_err(dev, "irq request failed\n");
        goto err_lcd_clk;
    }

    dev_dbg(dev, "got resources (regs %p), probing windows\n", sfb->regs);

    platform_set_drvdata(pdev, sfb);
    pm_runtime_get_sync(sfb->dev);

    /* setup gpio and output polarity controls */

    pd->setup_gpio();

    writel(pd->vidcon1, sfb->regs + VIDCON1);

    /* set video clock running at under-run */
    if (sfb->variant.has_fixvclk) {
        reg = readl(sfb->regs + VIDCON1);
        reg &= ~VIDCON1_VCLK_MASK;
        reg |= VIDCON1_VCLK_RUN;
        writel(reg, sfb->regs + VIDCON1);
    }

    /* zero all windows before we do anything */

    for (win = 0; win < fbdrv->variant.nr_windows; win++)
        s3c_fb_clear_win(sfb, win);

    /* initialise colour key controls */
    for (win = 0; win < (fbdrv->variant.nr_windows - 1); win++) {
        void __iomem *regs = sfb->regs + sfb->variant.keycon;

        regs += (win * 8);
        writel(0xffffff, regs + WKEYCON0);
        writel(0xffffff, regs + WKEYCON1);
    }

    s3c_fb_set_rgb_timing(sfb);

    /* we have the register setup, start allocating framebuffers */

    for (win = 0; win < fbdrv->variant.nr_windows; win++) {
        if (!pd->win[win])
            continue;

        ret = s3c_fb_probe_win(sfb, win, fbdrv->win[win],
                       &sfb->windows[win]);
        if (ret < 0) {
            dev_err(dev, "failed to create window %d\n", win);
            for (; win >= 0; win--)
                s3c_fb_release_win(sfb, sfb->windows[win]);
            goto err_pm_runtime;
        }
    }

    platform_set_drvdata(pdev, sfb);
    pm_runtime_put_sync(sfb->dev);

    return 0;

err_pm_runtime:
    pm_runtime_put_sync(sfb->dev);

err_lcd_clk:
    pm_runtime_disable(sfb->dev);

    if (!sfb->variant.has_clksel)
        clk_disable_unprepare(sfb->lcd_clk);

err_bus_clk:
    clk_disable_unprepare(sfb->bus_clk);

    return ret;
}

static int __devexit s3c_fb_remove(struct platform_device *pdev)
{
    struct s3c_fb *sfb = platform_get_drvdata(pdev);
    int win;

    pm_runtime_get_sync(sfb->dev);

    for (win = 0; win < S3C_FB_MAX_WIN; win++)
        if (sfb->windows[win])
            s3c_fb_release_win(sfb, sfb->windows[win]);

    if (!sfb->variant.has_clksel)
        clk_disable_unprepare(sfb->lcd_clk);

    clk_disable_unprepare(sfb->bus_clk);

    pm_runtime_put_sync(sfb->dev);
    pm_runtime_disable(sfb->dev);

    return 0;
}

#ifdef CONFIG_PM_SLEEP
static int s3c_fb_suspend(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct s3c_fb *sfb = platform_get_drvdata(pdev);
    struct s3c_fb_win *win;
    int win_no;

    pm_runtime_get_sync(sfb->dev);

    for (win_no = S3C_FB_MAX_WIN - 1; win_no >= 0; win_no--) {
        win = sfb->windows[win_no];
        if (!win)
            continue;

        /* use the blank function to push into power-down */
        s3c_fb_blank(FB_BLANK_POWERDOWN, win->fbinfo);
    }

    if (!sfb->variant.has_clksel)
        clk_disable_unprepare(sfb->lcd_clk);

    clk_disable_unprepare(sfb->bus_clk);

    pm_runtime_put_sync(sfb->dev);

    return 0;
}

static int s3c_fb_resume(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct s3c_fb *sfb = platform_get_drvdata(pdev);
    struct s3c_fb_platdata *pd = sfb->pdata;
    struct s3c_fb_win *win;
    int win_no;
    u32 reg;

    pm_runtime_get_sync(sfb->dev);

    clk_prepare_enable(sfb->bus_clk);

    if (!sfb->variant.has_clksel)
        clk_prepare_enable(sfb->lcd_clk);

    /* setup gpio and output polarity controls */
    pd->setup_gpio();
    writel(pd->vidcon1, sfb->regs + VIDCON1);

    /* set video clock running at under-run */
    if (sfb->variant.has_fixvclk) {
        reg = readl(sfb->regs + VIDCON1);
        reg &= ~VIDCON1_VCLK_MASK;
        reg |= VIDCON1_VCLK_RUN;
        writel(reg, sfb->regs + VIDCON1);
    }

    /* zero all windows before we do anything */
    for (win_no = 0; win_no < sfb->variant.nr_windows; win_no++)
        s3c_fb_clear_win(sfb, win_no);

    for (win_no = 0; win_no < sfb->variant.nr_windows - 1; win_no++) {
        void __iomem *regs = sfb->regs + sfb->variant.keycon;
        win = sfb->windows[win_no];
        if (!win)
            continue;

        shadow_protect_win(win, 1);
        regs += (win_no * 8);
        writel(0xffffff, regs + WKEYCON0);
        writel(0xffffff, regs + WKEYCON1);
        shadow_protect_win(win, 0);
    }

    s3c_fb_set_rgb_timing(sfb);

    /* restore framebuffers */
    for (win_no = 0; win_no < S3C_FB_MAX_WIN; win_no++) {
        win = sfb->windows[win_no];
        if (!win)
            continue;

        dev_dbg(&pdev->dev, "resuming window %d\n", win_no);
        s3c_fb_set_par(win->fbinfo);
    }

    pm_runtime_put_sync(sfb->dev);

    return 0;
}
#endif

#ifdef CONFIG_PM_RUNTIME
static int s3c_fb_runtime_suspend(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct s3c_fb *sfb = platform_get_drvdata(pdev);

    if (!sfb->variant.has_clksel)
        clk_disable_unprepare(sfb->lcd_clk);

    clk_disable_unprepare(sfb->bus_clk);

    return 0;
}

static int s3c_fb_runtime_resume(struct device *dev)
{
    struct platform_device *pdev = to_platform_device(dev);
    struct s3c_fb *sfb = platform_get_drvdata(pdev);
    struct s3c_fb_platdata *pd = sfb->pdata;

    clk_prepare_enable(sfb->bus_clk);

    if (!sfb->variant.has_clksel)
        clk_prepare_enable(sfb->lcd_clk);

    /* setup gpio and output polarity controls */
    pd->setup_gpio();
    writel(pd->vidcon1, sfb->regs + VIDCON1);

    return 0;
}
#endif

#define VALID_BPP124 (VALID_BPP(1) | VALID_BPP(2) | VALID_BPP(4))
#define VALID_BPP1248 (VALID_BPP124 | VALID_BPP(8))

static struct s3c_fb_win_variant s3c_fb_data_64xx_wins[] = {
    [0] = {
        .has_osd_c  = 1,
        .osd_size_off   = 0x8,
        .palette_sz = 256,
        .valid_bpp  = (VALID_BPP1248 | VALID_BPP(16) |
                   VALID_BPP(18) | VALID_BPP(24)),
    },
    [1] = {
        .has_osd_c  = 1,
        .has_osd_d  = 1,
        .osd_size_off   = 0xc,
        .has_osd_alpha  = 1,
        .palette_sz = 256,
        .valid_bpp  = (VALID_BPP1248 | VALID_BPP(16) |
                   VALID_BPP(18) | VALID_BPP(19) |
                   VALID_BPP(24) | VALID_BPP(25) |
                   VALID_BPP(28)),
    },
    [2] = {
        .has_osd_c  = 1,
        .has_osd_d  = 1,
        .osd_size_off   = 0xc,
        .has_osd_alpha  = 1,
        .palette_sz = 16,
        .palette_16bpp  = 1,
        .valid_bpp  = (VALID_BPP1248 | VALID_BPP(16) |
                   VALID_BPP(18) | VALID_BPP(19) |
                   VALID_BPP(24) | VALID_BPP(25) |
                   VALID_BPP(28)),
    },
    [3] = {
        .has_osd_c  = 1,
        .has_osd_alpha  = 1,
        .palette_sz = 16,
        .palette_16bpp  = 1,
        .valid_bpp  = (VALID_BPP124  | VALID_BPP(16) |
                   VALID_BPP(18) | VALID_BPP(19) |
                   VALID_BPP(24) | VALID_BPP(25) |
                   VALID_BPP(28)),
    },
    [4] = {
        .has_osd_c  = 1,
        .has_osd_alpha  = 1,
        .palette_sz = 4,
        .palette_16bpp  = 1,
        .valid_bpp  = (VALID_BPP(1) | VALID_BPP(2) |
                   VALID_BPP(16) | VALID_BPP(18) |
                   VALID_BPP(19) | VALID_BPP(24) |
                   VALID_BPP(25) | VALID_BPP(28)),
    },
};

static struct s3c_fb_win_variant s3c_fb_data_s5p_wins[] = {
    [0] = {
        .has_osd_c  = 1,
        .osd_size_off   = 0x8,
        .palette_sz = 256,
        .valid_bpp  = (VALID_BPP1248 | VALID_BPP(13) |
                   VALID_BPP(15) | VALID_BPP(16) |
                   VALID_BPP(18) | VALID_BPP(19) |
                   VALID_BPP(24) | VALID_BPP(25) |
                   VALID_BPP(32)),
    },
    [1] = {
        .has_osd_c  = 1,
        .has_osd_d  = 1,
        .osd_size_off   = 0xc,
        .has_osd_alpha  = 1,
        .palette_sz = 256,
        .valid_bpp  = (VALID_BPP1248 | VALID_BPP(13) |
                   VALID_BPP(15) | VALID_BPP(16) |
                   VALID_BPP(18) | VALID_BPP(19) |
                   VALID_BPP(24) | VALID_BPP(25) |
                   VALID_BPP(32)),
    },
    [2] = {
        .has_osd_c  = 1,
        .has_osd_d  = 1,
        .osd_size_off   = 0xc,
        .has_osd_alpha  = 1,
        .palette_sz = 256,
        .valid_bpp  = (VALID_BPP1248 | VALID_BPP(13) |
                   VALID_BPP(15) | VALID_BPP(16) |
                   VALID_BPP(18) | VALID_BPP(19) |
                   VALID_BPP(24) | VALID_BPP(25) |
                   VALID_BPP(32)),
    },
    [3] = {
        .has_osd_c  = 1,
        .has_osd_alpha  = 1,
        .palette_sz = 256,
        .valid_bpp  = (VALID_BPP1248 | VALID_BPP(13) |
                   VALID_BPP(15) | VALID_BPP(16) |
                   VALID_BPP(18) | VALID_BPP(19) |
                   VALID_BPP(24) | VALID_BPP(25) |
                   VALID_BPP(32)),
    },
    [4] = {
        .has_osd_c  = 1,
        .has_osd_alpha  = 1,
        .palette_sz = 256,
        .valid_bpp  = (VALID_BPP1248 | VALID_BPP(13) |
                   VALID_BPP(15) | VALID_BPP(16) |
                   VALID_BPP(18) | VALID_BPP(19) |
                   VALID_BPP(24) | VALID_BPP(25) |
                   VALID_BPP(32)),
    },
};

static struct s3c_fb_driverdata s3c_fb_data_64xx = {
    .variant = {
        .nr_windows = 5,
        .vidtcon    = VIDTCON0,
        .wincon     = WINCON(0),
        .winmap     = WINxMAP(0),
        .keycon     = WKEYCON,
        .osd        = VIDOSD_BASE,
        .osd_stride = 16,
        .buf_start  = VIDW_BUF_START(0),
        .buf_size   = VIDW_BUF_SIZE(0),
        .buf_end    = VIDW_BUF_END(0),

        .palette = {
            [0] = 0x400,
            [1] = 0x800,
            [2] = 0x300,
            [3] = 0x320,
            [4] = 0x340,
        },

        .has_prtcon = 1,
        .has_clksel = 1,
    },
    .win[0] = &s3c_fb_data_64xx_wins[0],
    .win[1] = &s3c_fb_data_64xx_wins[1],
    .win[2] = &s3c_fb_data_64xx_wins[2],
    .win[3] = &s3c_fb_data_64xx_wins[3],
    .win[4] = &s3c_fb_data_64xx_wins[4],
};

static struct s3c_fb_driverdata s3c_fb_data_s5pc100 = {
    .variant = {
        .nr_windows = 5,
        .vidtcon    = VIDTCON0,
        .wincon     = WINCON(0),
        .winmap     = WINxMAP(0),
        .keycon     = WKEYCON,
        .osd        = VIDOSD_BASE,
        .osd_stride = 16,
        .buf_start  = VIDW_BUF_START(0),
        .buf_size   = VIDW_BUF_SIZE(0),
        .buf_end    = VIDW_BUF_END(0),

        .palette = {
            [0] = 0x2400,
            [1] = 0x2800,
            [2] = 0x2c00,
            [3] = 0x3000,
            [4] = 0x3400,
        },

        .has_prtcon = 1,
        .has_blendcon   = 1,
        .has_clksel = 1,
    },
    .win[0] = &s3c_fb_data_s5p_wins[0],
    .win[1] = &s3c_fb_data_s5p_wins[1],
    .win[2] = &s3c_fb_data_s5p_wins[2],
    .win[3] = &s3c_fb_data_s5p_wins[3],
    .win[4] = &s3c_fb_data_s5p_wins[4],
};

static struct s3c_fb_driverdata s3c_fb_data_s5pv210 = {
    .variant = {
        .nr_windows = 5,
        .vidtcon    = VIDTCON0,
        .wincon     = WINCON(0),
        .winmap     = WINxMAP(0),
        .keycon     = WKEYCON,
        .osd        = VIDOSD_BASE,
        .osd_stride = 16,
        .buf_start  = VIDW_BUF_START(0),
        .buf_size   = VIDW_BUF_SIZE(0),
        .buf_end    = VIDW_BUF_END(0),

        .palette = {
            [0] = 0x2400,
            [1] = 0x2800,
            [2] = 0x2c00,
            [3] = 0x3000,
            [4] = 0x3400,
        },

        .has_shadowcon  = 1,
        .has_blendcon   = 1,
        .has_clksel = 1,
        .has_fixvclk    = 1,
    },
    .win[0] = &s3c_fb_data_s5p_wins[0],
    .win[1] = &s3c_fb_data_s5p_wins[1],
    .win[2] = &s3c_fb_data_s5p_wins[2],
    .win[3] = &s3c_fb_data_s5p_wins[3],
    .win[4] = &s3c_fb_data_s5p_wins[4],
};

static struct s3c_fb_driverdata s3c_fb_data_exynos4 = {
    .variant = {
        .nr_windows = 5,
        .vidtcon    = VIDTCON0,
        .wincon     = WINCON(0),
        .winmap     = WINxMAP(0),
        .keycon     = WKEYCON,
        .osd        = VIDOSD_BASE,
        .osd_stride = 16,
        .buf_start  = VIDW_BUF_START(0),
        .buf_size   = VIDW_BUF_SIZE(0),
        .buf_end    = VIDW_BUF_END(0),

        .palette = {
            [0] = 0x2400,
            [1] = 0x2800,
            [2] = 0x2c00,
            [3] = 0x3000,
            [4] = 0x3400,
        },

        .has_shadowcon  = 1,
        .has_blendcon   = 1,
        .has_fixvclk    = 1,
    },
    .win[0] = &s3c_fb_data_s5p_wins[0],
    .win[1] = &s3c_fb_data_s5p_wins[1],
    .win[2] = &s3c_fb_data_s5p_wins[2],
    .win[3] = &s3c_fb_data_s5p_wins[3],
    .win[4] = &s3c_fb_data_s5p_wins[4],
};

static struct s3c_fb_driverdata s3c_fb_data_exynos5 = {
    .variant = {
        .nr_windows = 5,
        .vidtcon    = VIDTCON0,
        .wincon     = WINCON(0),
        .winmap     = WINxMAP(0),
        .keycon     = WKEYCON,
        .osd        = VIDOSD_BASE,
        .osd_stride = 16,
        .buf_start  = VIDW_BUF_START(0),
        .buf_size   = VIDW_BUF_SIZE(0),
        .buf_end    = VIDW_BUF_END(0),

        .palette = {
            [0] = 0x2400,
            [1] = 0x2800,
            [2] = 0x2c00,
            [3] = 0x3000,
            [4] = 0x3400,
        },
        .has_shadowcon  = 1,
        .has_blendcon   = 1,
        .has_fixvclk    = 1,
    },
    .win[0] = &s3c_fb_data_s5p_wins[0],
    .win[1] = &s3c_fb_data_s5p_wins[1],
    .win[2] = &s3c_fb_data_s5p_wins[2],
    .win[3] = &s3c_fb_data_s5p_wins[3],
    .win[4] = &s3c_fb_data_s5p_wins[4],
};

/* S3C2443/S3C2416 style hardware */
static struct s3c_fb_driverdata s3c_fb_data_s3c2443 = {
    .variant = {
        .nr_windows = 2,
        .is_2443    = 1,

        .vidtcon    = 0x08,
        .wincon     = 0x14,
        .winmap     = 0xd0,
        .keycon     = 0xb0,
        .osd        = 0x28,
        .osd_stride = 12,
        .buf_start  = 0x64,
        .buf_size   = 0x94,
        .buf_end    = 0x7c,

        .palette = {
            [0] = 0x400,
            [1] = 0x800,
        },
        .has_clksel = 1,
    },
    .win[0] = &(struct s3c_fb_win_variant) {
        .palette_sz = 256,
        .valid_bpp  = VALID_BPP1248 | VALID_BPP(16) | VALID_BPP(24),
    },
    .win[1] = &(struct s3c_fb_win_variant) {
        .has_osd_c  = 1,
        .has_osd_alpha  = 1,
        .palette_sz = 256,
        .valid_bpp  = (VALID_BPP1248 | VALID_BPP(16) |
                   VALID_BPP(18) | VALID_BPP(19) |
                   VALID_BPP(24) | VALID_BPP(25) |
                   VALID_BPP(28)),
    },
};

static struct s3c_fb_driverdata s3c_fb_data_s5p64x0 = {
    .variant = {
        .nr_windows = 3,
        .vidtcon    = VIDTCON0,
        .wincon     = WINCON(0),
        .winmap     = WINxMAP(0),
        .keycon     = WKEYCON,
        .osd        = VIDOSD_BASE,
        .osd_stride = 16,
        .buf_start  = VIDW_BUF_START(0),
        .buf_size   = VIDW_BUF_SIZE(0),
        .buf_end    = VIDW_BUF_END(0),

        .palette = {
            [0] = 0x2400,
            [1] = 0x2800,
            [2] = 0x2c00,
        },

        .has_blendcon   = 1,
        .has_fixvclk    = 1,
    },
    .win[0] = &s3c_fb_data_s5p_wins[0],
    .win[1] = &s3c_fb_data_s5p_wins[1],
    .win[2] = &s3c_fb_data_s5p_wins[2],
};

static struct platform_device_id s3c_fb_driver_ids[] = {
    {
        .name       = "s3c-fb",
        .driver_data    = (unsigned long)&s3c_fb_data_64xx,
    }, {
        .name       = "s5pc100-fb",
        .driver_data    = (unsigned long)&s3c_fb_data_s5pc100,
    }, {
        .name       = "s5pv210-fb",
        .driver_data    = (unsigned long)&s3c_fb_data_s5pv210,
    }, {
        .name       = "exynos4-fb",
        .driver_data    = (unsigned long)&s3c_fb_data_exynos4,
    }, {
        .name       = "exynos5-fb",
        .driver_data    = (unsigned long)&s3c_fb_data_exynos5,
    }, {
        .name       = "s3c2443-fb",
        .driver_data    = (unsigned long)&s3c_fb_data_s3c2443,
    }, {
        .name       = "s5p64x0-fb",
        .driver_data    = (unsigned long)&s3c_fb_data_s5p64x0,
    },
    {},
};
MODULE_DEVICE_TABLE(platform, s3c_fb_driver_ids);

static const struct dev_pm_ops s3cfb_pm_ops = {
    SET_SYSTEM_SLEEP_PM_OPS(s3c_fb_suspend, s3c_fb_resume)
    SET_RUNTIME_PM_OPS(s3c_fb_runtime_suspend, s3c_fb_runtime_resume,
               NULL)
};

static struct platform_driver s3c_fb_driver = {
    .probe      = s3c_fb_probe,
    .remove     = __devexit_p(s3c_fb_remove),
    .id_table   = s3c_fb_driver_ids,
    .driver     = {
        .name   = "s3c-fb",
        .owner  = THIS_MODULE,
        .pm = &s3cfb_pm_ops,
    },
};

module_platform_driver(s3c_fb_driver);

MODULE_AUTHOR("Ben Dooks <[email protected]>");
MODULE_DESCRIPTION("Samsung S3C SoC Framebuffer driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s3c-fb");