fb-puv3.c

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/*
 * Frame Buffer Driver for PKUnity-v3 Unigfx
 * Code specific to PKUnity SoC and UniCore ISA
 *
 *  Maintained by GUAN Xue-tao <[email protected]>
 *  Copyright (C) 2001-2010 Guan Xuetao
 *
 * 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/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/console.h>

#include <asm/sizes.h>
#include <mach/hardware.h>

/* Platform_data reserved for unifb registers. */
#define UNIFB_REGS_NUM      10
/* RAM reserved for the frame buffer. */
#define UNIFB_MEMSIZE       (SZ_4M)     /* 4 MB for 1024*768*32b */

/*
 * cause UNIGFX don not have EDID
 * all the modes are organized as follow
 */
static const struct fb_videomode unifb_modes[] = {
    /* 0 640x480-60 VESA */
    { "640x480@60",  60,  640, 480,  25175000,  48, 16, 34, 10,  96, 1,
      0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 1 640x480-75 VESA */
    { "640x480@75",  75,  640, 480,  31500000, 120, 16, 18,  1,  64, 1,
      0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 2 800x600-60 VESA */
    { "800x600@60",  60,  800, 600,  40000000,  88, 40, 26,  1, 128, 1,
      0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 3 800x600-75 VESA */
    { "800x600@75",  75,  800, 600,  49500000, 160, 16, 23,  1,  80, 1,
      0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 4 1024x768-60 VESA */
    { "1024x768@60", 60, 1024, 768,  65000000, 160, 24, 34,  3, 136, 1,
      0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 5 1024x768-75 VESA */
    { "1024x768@75", 75, 1024, 768,  78750000, 176, 16, 30,  1,  96, 1,
      0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 6 1280x960-60 VESA */
    { "1280x960@60", 60, 1280, 960, 108000000, 312, 96, 38,  1, 112, 1,
      0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 7 1440x900-60 VESA */
    { "1440x900@60", 60, 1440, 900, 106500000, 232, 80, 30,  3, 152, 1,
      0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 8 FIXME 9 1024x600-60 VESA UNTESTED */
    { "1024x600@60", 60, 1024, 600,  50650000, 160, 24, 26,  1, 136, 1,
      0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 9 FIXME 10 1024x600-75 VESA UNTESTED */
    { "1024x600@75", 75, 1024, 600,  61500000, 176, 16, 23,  1,  96, 1,
      0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
    /* 10 FIXME 11 1366x768-60 VESA UNTESTED */
    { "1366x768@60", 60, 1366, 768,  85500000, 256, 58, 18,  1,  112, 3,
      0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
};

static struct fb_var_screeninfo unifb_default = {
    .xres =     640,
    .yres =     480,
    .xres_virtual = 640,
    .yres_virtual = 480,
    .bits_per_pixel = 16,
    .red =      { 11, 5, 0 },
    .green =    { 5,  6, 0 },
    .blue =     { 0,  5, 0 },
    .activate = FB_ACTIVATE_NOW,
    .height =   -1,
    .width =    -1,
    .pixclock = 25175000,
    .left_margin =  48,
    .right_margin = 16,
    .upper_margin = 33,
    .lower_margin = 10,
    .hsync_len =    96,
    .vsync_len =    2,
    .vmode =    FB_VMODE_NONINTERLACED,
};

static struct fb_fix_screeninfo unifb_fix = {
    .id =       "UNIGFX FB",
    .type =     FB_TYPE_PACKED_PIXELS,
    .visual =   FB_VISUAL_TRUECOLOR,
    .xpanstep = 1,
    .ypanstep = 1,
    .ywrapstep =    1,
    .accel =    FB_ACCEL_NONE,
};

static void unifb_sync(struct fb_info *info)
{
    /* TODO: may, this can be replaced by interrupt */
    int cnt;

    for (cnt = 0; cnt < 0x10000000; cnt++) {
        if (readl(UGE_COMMAND) & 0x1000000)
            return;
    }

    if (cnt > 0x8000000)
        dev_warn(info->device, "Warning: UniGFX GE time out ...\n");
}

static void unifb_prim_fillrect(struct fb_info *info,
                const struct fb_fillrect *region)
{
    int awidth = region->width;
    int aheight = region->height;
    int m_iBpp = info->var.bits_per_pixel;
    int screen_width = info->var.xres;
    int src_sel = 1;    /* from fg_color */
    int pat_sel = 1;
    int src_x0 = 0;
    int dst_x0 = region->dx;
    int src_y0 = 0;
    int dst_y0 = region->dy;
    int rop_alpha_sel = 0;
    int rop_alpha_code = 0xCC;
    int x_dir = 1;
    int y_dir = 1;
    int alpha_r = 0;
    int alpha_sel = 0;
    int dst_pitch = screen_width * (m_iBpp / 8);
    int dst_offset = dst_y0 * dst_pitch + dst_x0 * (m_iBpp / 8);
    int src_pitch = screen_width * (m_iBpp / 8);
    int src_offset = src_y0 * src_pitch + src_x0 * (m_iBpp / 8);
    unsigned int command = 0;
    int clip_region = 0;
    int clip_en = 0;
    int tp_en = 0;
    int fg_color = 0;
    int bottom = info->var.yres - 1;
    int right = info->var.xres - 1;
    int top = 0;

    bottom = (bottom << 16) | right;
    command = (rop_alpha_sel << 26) | (pat_sel << 18) | (src_sel << 16)
        | (x_dir << 20) | (y_dir << 21) | (command << 24)
        | (clip_region << 23) | (clip_en << 22) | (tp_en << 27);
    src_pitch = (dst_pitch << 16) | src_pitch;
    awidth = awidth | (aheight << 16);
    alpha_r = ((rop_alpha_code & 0xff) << 8) | (alpha_r & 0xff)
        | (alpha_sel << 16);
    src_x0 = (src_x0 & 0x1fff) | ((src_y0 & 0x1fff) << 16);
    dst_x0 = (dst_x0 & 0x1fff) | ((dst_y0 & 0x1fff) << 16);
    fg_color = region->color;

    unifb_sync(info);

    writel(((u32 *)(info->pseudo_palette))[fg_color], UGE_FCOLOR);
    writel(0, UGE_BCOLOR);
    writel(src_pitch, UGE_PITCH);
    writel(src_offset, UGE_SRCSTART);
    writel(dst_offset, UGE_DSTSTART);
    writel(awidth, UGE_WIDHEIGHT);
    writel(top, UGE_CLIP0);
    writel(bottom, UGE_CLIP1);
    writel(alpha_r, UGE_ROPALPHA);
    writel(src_x0, UGE_SRCXY);
    writel(dst_x0, UGE_DSTXY);
    writel(command, UGE_COMMAND);
}

static void unifb_fillrect(struct fb_info *info,
        const struct fb_fillrect *region)
{
    struct fb_fillrect modded;
    int vxres, vyres;

    if (info->flags & FBINFO_HWACCEL_DISABLED) {
        sys_fillrect(info, region);
        return;
    }

    vxres = info->var.xres_virtual;
    vyres = info->var.yres_virtual;

    memcpy(&modded, region, sizeof(struct fb_fillrect));

    if (!modded.width || !modded.height ||
        modded.dx >= vxres || modded.dy >= vyres)
        return;

    if (modded.dx + modded.width > vxres)
        modded.width = vxres - modded.dx;
    if (modded.dy + modded.height > vyres)
        modded.height = vyres - modded.dy;

    unifb_prim_fillrect(info, &modded);
}

static void unifb_prim_copyarea(struct fb_info *info,
                const struct fb_copyarea *area)
{
    int awidth = area->width;
    int aheight = area->height;
    int m_iBpp = info->var.bits_per_pixel;
    int screen_width = info->var.xres;
    int src_sel = 2;    /* from mem */
    int pat_sel = 0;
    int src_x0 = area->sx;
    int dst_x0 = area->dx;
    int src_y0 = area->sy;
    int dst_y0 = area->dy;

    int rop_alpha_sel = 0;
    int rop_alpha_code = 0xCC;
    int x_dir = 1;
    int y_dir = 1;

    int alpha_r = 0;
    int alpha_sel = 0;
    int dst_pitch = screen_width * (m_iBpp / 8);
    int dst_offset = dst_y0 * dst_pitch + dst_x0 * (m_iBpp / 8);
    int src_pitch = screen_width * (m_iBpp / 8);
    int src_offset = src_y0 * src_pitch + src_x0 * (m_iBpp / 8);
    unsigned int command = 0;
    int clip_region = 0;
    int clip_en = 1;
    int tp_en = 0;
    int top = 0;
    int bottom = info->var.yres;
    int right = info->var.xres;
    int fg_color = 0;
    int bg_color = 0;

    if (src_x0 < 0)
        src_x0 = 0;
    if (src_y0 < 0)
        src_y0 = 0;

    if (src_y0 - dst_y0 > 0) {
        y_dir = 1;
    } else {
        y_dir = 0;
        src_offset = (src_y0 + aheight) * src_pitch +
                src_x0 * (m_iBpp / 8);
        dst_offset = (dst_y0 + aheight) * dst_pitch +
                dst_x0 * (m_iBpp / 8);
        src_y0 += aheight;
        dst_y0 += aheight;
    }

    command = (rop_alpha_sel << 26) | (pat_sel << 18) | (src_sel << 16) |
        (x_dir << 20) | (y_dir << 21) | (command << 24) |
        (clip_region << 23) | (clip_en << 22) | (tp_en << 27);
    src_pitch = (dst_pitch << 16) | src_pitch;
    awidth = awidth | (aheight << 16);
    alpha_r = ((rop_alpha_code & 0xff) << 8) | (alpha_r & 0xff) |
        (alpha_sel << 16);
    src_x0 = (src_x0 & 0x1fff) | ((src_y0 & 0x1fff) << 16);
    dst_x0 = (dst_x0 & 0x1fff) | ((dst_y0 & 0x1fff) << 16);
    bottom = (bottom << 16) | right;

    unifb_sync(info);

    writel(src_pitch, UGE_PITCH);
    writel(src_offset, UGE_SRCSTART);
    writel(dst_offset, UGE_DSTSTART);
    writel(awidth, UGE_WIDHEIGHT);
    writel(top, UGE_CLIP0);
    writel(bottom, UGE_CLIP1);
    writel(bg_color, UGE_BCOLOR);
    writel(fg_color, UGE_FCOLOR);
    writel(alpha_r, UGE_ROPALPHA);
    writel(src_x0, UGE_SRCXY);
    writel(dst_x0, UGE_DSTXY);
    writel(command, UGE_COMMAND);
}

static void unifb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
{
    struct fb_copyarea modded;
    u32 vxres, vyres;
    modded.sx = area->sx;
    modded.sy = area->sy;
    modded.dx = area->dx;
    modded.dy = area->dy;
    modded.width = area->width;
    modded.height = area->height;

    if (info->flags & FBINFO_HWACCEL_DISABLED) {
        sys_copyarea(info, area);
        return;
    }

    vxres = info->var.xres_virtual;
    vyres = info->var.yres_virtual;

    if (!modded.width || !modded.height ||
        modded.sx >= vxres || modded.sy >= vyres ||
        modded.dx >= vxres || modded.dy >= vyres)
        return;

    if (modded.sx + modded.width > vxres)
        modded.width = vxres - modded.sx;
    if (modded.dx + modded.width > vxres)
        modded.width = vxres - modded.dx;
    if (modded.sy + modded.height > vyres)
        modded.height = vyres - modded.sy;
    if (modded.dy + modded.height > vyres)
        modded.height = vyres - modded.dy;

    unifb_prim_copyarea(info, &modded);
}

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

static u_long get_line_length(int xres_virtual, int bpp)
{
    u_long length;

    length = xres_virtual * bpp;
    length = (length + 31) & ~31;
    length >>= 3;
    return length;
}

/*
 *  Setting the video mode has been split into two parts.
 *  First part, xxxfb_check_var, must not write anything
 *  to hardware, it should only verify and adjust var.
 *  This means it doesn't alter par but it does use hardware
 *  data from it to check this var.
 */
static int unifb_check_var(struct fb_var_screeninfo *var,
             struct fb_info *info)
{
    u_long line_length;

    /*
     *  FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
     *  as FB_VMODE_SMOOTH_XPAN is only used internally
     */

    if (var->vmode & FB_VMODE_CONUPDATE) {
        var->vmode |= FB_VMODE_YWRAP;
        var->xoffset = info->var.xoffset;
        var->yoffset = info->var.yoffset;
    }

    /*
     *  Some very basic checks
     */
    if (!var->xres)
        var->xres = 1;
    if (!var->yres)
        var->yres = 1;
    if (var->xres > var->xres_virtual)
        var->xres_virtual = var->xres;
    if (var->yres > var->yres_virtual)
        var->yres_virtual = var->yres;
    if (var->bits_per_pixel <= 1)
        var->bits_per_pixel = 1;
    else if (var->bits_per_pixel <= 8)
        var->bits_per_pixel = 8;
    else if (var->bits_per_pixel <= 16)
        var->bits_per_pixel = 16;
    else if (var->bits_per_pixel <= 24)
        var->bits_per_pixel = 24;
    else if (var->bits_per_pixel <= 32)
        var->bits_per_pixel = 32;
    else
        return -EINVAL;

    if (var->xres_virtual < var->xoffset + var->xres)
        var->xres_virtual = var->xoffset + var->xres;
    if (var->yres_virtual < var->yoffset + var->yres)
        var->yres_virtual = var->yoffset + var->yres;

    /*
     *  Memory limit
     */
    line_length =
        get_line_length(var->xres_virtual, var->bits_per_pixel);
    if (line_length * var->yres_virtual > UNIFB_MEMSIZE)
        return -ENOMEM;

    /*
     * Now that we checked it we alter var. The reason being is that the
     * video mode passed in might not work but slight changes to it might
     * make it work. This way we let the user know what is acceptable.
     */
    switch (var->bits_per_pixel) {
    case 1:
    case 8:
        var->red.offset = 0;
        var->red.length = 8;
        var->green.offset = 0;
        var->green.length = 8;
        var->blue.offset = 0;
        var->blue.length = 8;
        var->transp.offset = 0;
        var->transp.length = 0;
        break;
    case 16:        /* RGBA 5551 */
        if (var->transp.length) {
            var->red.offset = 0;
            var->red.length = 5;
            var->green.offset = 5;
            var->green.length = 5;
            var->blue.offset = 10;
            var->blue.length = 5;
            var->transp.offset = 15;
            var->transp.length = 1;
        } else {    /* RGB 565 */
            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;
        }
        break;
    case 24:        /* RGB 888 */
        var->red.offset = 0;
        var->red.length = 8;
        var->green.offset = 8;
        var->green.length = 8;
        var->blue.offset = 16;
        var->blue.length = 8;
        var->transp.offset = 0;
        var->transp.length = 0;
        break;
    case 32:        /* RGBA 8888 */
        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;
        break;
    }
    var->red.msb_right = 0;
    var->green.msb_right = 0;
    var->blue.msb_right = 0;
    var->transp.msb_right = 0;

    return 0;
}

/*
 * This routine actually sets the video mode. It's in here where we
 * the hardware state info->par and fix which can be affected by the
 * change in par. For this driver it doesn't do much.
 */
static int unifb_set_par(struct fb_info *info)
{
    int hTotal, vTotal, hSyncStart, hSyncEnd, vSyncStart, vSyncEnd;
    int format;

#ifdef CONFIG_PUV3_PM
    struct clk *clk_vga;
    u32 pixclk = 0;
    int i;

    for (i = 0; i <= 10; i++) {
        if    (info->var.xres         == unifb_modes[i].xres
            && info->var.yres         == unifb_modes[i].yres
            && info->var.upper_margin == unifb_modes[i].upper_margin
            && info->var.lower_margin == unifb_modes[i].lower_margin
            && info->var.left_margin  == unifb_modes[i].left_margin
            && info->var.right_margin == unifb_modes[i].right_margin
            && info->var.hsync_len    == unifb_modes[i].hsync_len
            && info->var.vsync_len    == unifb_modes[i].vsync_len) {
            pixclk = unifb_modes[i].pixclock;
            break;
        }
    }

    /* set clock rate */
    clk_vga = clk_get(info->device, "VGA_CLK");
    if (clk_vga == ERR_PTR(-ENOENT))
        return -ENOENT;

    if (pixclk != 0) {
        if (clk_set_rate(clk_vga, pixclk)) { /* set clock failed */
            info->fix = unifb_fix;
            info->var = unifb_default;
            if (clk_set_rate(clk_vga, unifb_default.pixclock))
                return -EINVAL;
        }
    }
#endif

    info->fix.line_length = get_line_length(info->var.xres_virtual,
                        info->var.bits_per_pixel);

    hSyncStart = info->var.xres + info->var.right_margin;
    hSyncEnd = hSyncStart + info->var.hsync_len;
    hTotal = hSyncEnd + info->var.left_margin;

    vSyncStart = info->var.yres + info->var.lower_margin;
    vSyncEnd = vSyncStart + info->var.vsync_len;
    vTotal = vSyncEnd + info->var.upper_margin;

    switch (info->var.bits_per_pixel) {
    case 8:
        format = UDE_CFG_DST8;
        break;
    case 16:
        format = UDE_CFG_DST16;
        break;
    case 24:
        format = UDE_CFG_DST24;
        break;
    case 32:
        format = UDE_CFG_DST32;
        break;
    default:
        return -EINVAL;
    }

    writel(info->fix.smem_start, UDE_FSA);
    writel(info->var.yres, UDE_LS);
    writel(get_line_length(info->var.xres,
            info->var.bits_per_pixel) >> 3, UDE_PS);
            /* >> 3 for hardware required. */
    writel((hTotal << 16) | (info->var.xres), UDE_HAT);
    writel(((hTotal - 1) << 16) | (info->var.xres - 1), UDE_HBT);
    writel(((hSyncEnd - 1) << 16) | (hSyncStart - 1), UDE_HST);
    writel((vTotal << 16) | (info->var.yres), UDE_VAT);
    writel(((vTotal - 1) << 16) | (info->var.yres - 1), UDE_VBT);
    writel(((vSyncEnd - 1) << 16) | (vSyncStart - 1), UDE_VST);
    writel(UDE_CFG_GDEN_ENABLE | UDE_CFG_TIMEUP_ENABLE
            | format | 0xC0000001, UDE_CFG);

    return 0;
}

/*
 *  Set a single color register. The values supplied are already
 *  rounded down to the hardware's capabilities (according to the
 *  entries in the var structure). Return != 0 for invalid regno.
 */
static int unifb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
             u_int transp, struct fb_info *info)
{
    if (regno >= 256)   /* no. of hw registers */
        return 1;

    /* grayscale works only partially under directcolor */
    if (info->var.grayscale) {
        /* grayscale = 0.30*R + 0.59*G + 0.11*B */
        red = green = blue =
            (red * 77 + green * 151 + blue * 28) >> 8;
    }

#define CNVT_TOHW(val, width) ((((val)<<(width))+0x7FFF-(val))>>16)
    switch (info->fix.visual) {
    case FB_VISUAL_TRUECOLOR:
    case FB_VISUAL_PSEUDOCOLOR:
        red = CNVT_TOHW(red, info->var.red.length);
        green = CNVT_TOHW(green, info->var.green.length);
        blue = CNVT_TOHW(blue, info->var.blue.length);
        transp = CNVT_TOHW(transp, info->var.transp.length);
        break;
    case FB_VISUAL_DIRECTCOLOR:
        red = CNVT_TOHW(red, 8);    /* expect 8 bit DAC */
        green = CNVT_TOHW(green, 8);
        blue = CNVT_TOHW(blue, 8);
        /* hey, there is bug in transp handling... */
        transp = CNVT_TOHW(transp, 8);
        break;
    }
#undef CNVT_TOHW
    /* Truecolor has hardware independent palette */
    if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
        u32 v;

        if (regno >= 16)
            return 1;

        v = (red << info->var.red.offset) |
            (green << info->var.green.offset) |
            (blue << info->var.blue.offset) |
            (transp << info->var.transp.offset);
        switch (info->var.bits_per_pixel) {
        case 8:
            break;
        case 16:
        case 24:
        case 32:
            ((u32 *) (info->pseudo_palette))[regno] = v;
            break;
        default:
            return 1;
        }
        return 0;
    }
    return 0;
}

/*
 *  Pan or Wrap the Display
 *
 *  This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
 */
static int unifb_pan_display(struct fb_var_screeninfo *var,
               struct fb_info *info)
{
    if (var->vmode & FB_VMODE_YWRAP) {
        if (var->yoffset < 0
            || var->yoffset >= info->var.yres_virtual
            || var->xoffset)
            return -EINVAL;
    } else {
        if (var->xoffset + info->var.xres > info->var.xres_virtual ||
            var->yoffset + info->var.yres > info->var.yres_virtual)
            return -EINVAL;
    }
    info->var.xoffset = var->xoffset;
    info->var.yoffset = var->yoffset;
    if (var->vmode & FB_VMODE_YWRAP)
        info->var.vmode |= FB_VMODE_YWRAP;
    else
        info->var.vmode &= ~FB_VMODE_YWRAP;
    return 0;
}

int unifb_mmap(struct fb_info *info,
            struct vm_area_struct *vma)
{
    unsigned long size = vma->vm_end - vma->vm_start;
    unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
    unsigned long pos = info->fix.smem_start + offset;

    if (offset + size > info->fix.smem_len)
        return -EINVAL;

    vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

    if (io_remap_pfn_range(vma, vma->vm_start, pos >> PAGE_SHIFT, size,
                vma->vm_page_prot))
        return -EAGAIN;

    /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
    return 0;
}

static struct fb_ops unifb_ops = {
    .fb_read        = fb_sys_read,
    .fb_write       = fb_sys_write,
    .fb_check_var   = unifb_check_var,
    .fb_set_par = unifb_set_par,
    .fb_setcolreg   = unifb_setcolreg,
    .fb_pan_display = unifb_pan_display,
    .fb_fillrect    = unifb_fillrect,
    .fb_copyarea    = unifb_copyarea,
    .fb_imageblit   = unifb_imageblit,
    .fb_mmap    = unifb_mmap,
};

/*
 *  Initialisation
 */
static int unifb_probe(struct platform_device *dev)
{
    struct fb_info *info;
    u32 unifb_regs[UNIFB_REGS_NUM];
    int retval = -ENOMEM;
    struct resource *iomem;
    void *videomemory;

    videomemory = (void *)__get_free_pages(GFP_KERNEL | __GFP_COMP,
                get_order(UNIFB_MEMSIZE));
    if (!videomemory)
        goto err;

    memset(videomemory, 0, UNIFB_MEMSIZE);

    unifb_fix.smem_start = virt_to_phys(videomemory);
    unifb_fix.smem_len = UNIFB_MEMSIZE;

    iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
    unifb_fix.mmio_start = iomem->start;

    info = framebuffer_alloc(sizeof(u32)*256, &dev->dev);
    if (!info)
        goto err;

    info->screen_base = (char __iomem *)videomemory;
    info->fbops = &unifb_ops;

    retval = fb_find_mode(&info->var, info, NULL,
                  unifb_modes, 10, &unifb_modes[0], 16);

    if (!retval || (retval == 4))
        info->var = unifb_default;

    info->fix = unifb_fix;
    info->pseudo_palette = info->par;
    info->par = NULL;
    info->flags = FBINFO_FLAG_DEFAULT;
#ifdef FB_ACCEL_PUV3_UNIGFX
    info->fix.accel = FB_ACCEL_PUV3_UNIGFX;
#endif

    retval = fb_alloc_cmap(&info->cmap, 256, 0);
    if (retval < 0)
        goto err1;

    retval = register_framebuffer(info);
    if (retval < 0)
        goto err2;
    platform_set_drvdata(dev, info);
    platform_device_add_data(dev, unifb_regs, sizeof(u32) * UNIFB_REGS_NUM);

    printk(KERN_INFO
           "fb%d: Virtual frame buffer device, using %dM of video memory\n",
           info->node, UNIFB_MEMSIZE >> 20);
    return 0;
err2:
    fb_dealloc_cmap(&info->cmap);
err1:
    framebuffer_release(info);
err:
    return retval;
}

static int unifb_remove(struct platform_device *dev)
{
    struct fb_info *info = platform_get_drvdata(dev);

    if (info) {
        unregister_framebuffer(info);
        fb_dealloc_cmap(&info->cmap);
        framebuffer_release(info);
    }
    return 0;
}

#ifdef CONFIG_PM
static int unifb_resume(struct platform_device *dev)
{
    int rc = 0;
    u32 *unifb_regs = dev->dev.platform_data;

    if (dev->dev.power.power_state.event == PM_EVENT_ON)
        return 0;

    console_lock();

    if (dev->dev.power.power_state.event == PM_EVENT_SUSPEND) {
        writel(unifb_regs[0], UDE_FSA);
        writel(unifb_regs[1], UDE_LS);
        writel(unifb_regs[2], UDE_PS);
        writel(unifb_regs[3], UDE_HAT);
        writel(unifb_regs[4], UDE_HBT);
        writel(unifb_regs[5], UDE_HST);
        writel(unifb_regs[6], UDE_VAT);
        writel(unifb_regs[7], UDE_VBT);
        writel(unifb_regs[8], UDE_VST);
        writel(unifb_regs[9], UDE_CFG);
    }
    dev->dev.power.power_state = PMSG_ON;

    console_unlock();

    return rc;
}

static int unifb_suspend(struct platform_device *dev, pm_message_t mesg)
{
    u32 *unifb_regs = dev->dev.platform_data;

    unifb_regs[0] = readl(UDE_FSA);
    unifb_regs[1] = readl(UDE_LS);
    unifb_regs[2] = readl(UDE_PS);
    unifb_regs[3] = readl(UDE_HAT);
    unifb_regs[4] = readl(UDE_HBT);
    unifb_regs[5] = readl(UDE_HST);
    unifb_regs[6] = readl(UDE_VAT);
    unifb_regs[7] = readl(UDE_VBT);
    unifb_regs[8] = readl(UDE_VST);
    unifb_regs[9] = readl(UDE_CFG);

    if (mesg.event == dev->dev.power.power_state.event)
        return 0;

    switch (mesg.event) {
    case PM_EVENT_FREEZE:       /* about to take snapshot */
    case PM_EVENT_PRETHAW:      /* before restoring snapshot */
        goto done;
    }

    console_lock();

    /* do nothing... */

    console_unlock();

done:
    dev->dev.power.power_state = mesg;

    return 0;
}
#else
#define unifb_resume    NULL
#define unifb_suspend   NULL
#endif

static struct platform_driver unifb_driver = {
    .probe   = unifb_probe,
    .remove  = unifb_remove,
    .resume  = unifb_resume,
    .suspend = unifb_suspend,
    .driver  = {
        .name   = "PKUnity-v3-UNIGFX",
    },
};

static int __init unifb_init(void)
{
#ifndef MODULE
    if (fb_get_options("unifb", NULL))
        return -ENODEV;
#endif

    return platform_driver_register(&unifb_driver);
}

module_init(unifb_init);

static void __exit unifb_exit(void)
{
    platform_driver_unregister(&unifb_driver);
}

module_exit(unifb_exit);

MODULE_LICENSE("GPL v2");